* [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Hello,
Upon ack, please pull from the following git tree.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
This is the second take of block-unify-sector-and-data_len patchset.
The primary goal of this patchset is to consolidate all the similar
bug slightly different current position and data length fields in
struct request. For detailed description, please read the description
in the last take[L]. Changes from the last take[L] are
* Acked-by:'s added
* osd resid_len conversion was missing as pointed out by Boaz Harrosh,
fixed.
* patch to cleanup request length accessor usages after the conversion
added.
This patchset contains the following eleven patches.
0001-nbd-don-t-clear-rq-sector-and-nr_sectors-unnecessa.patch
0002-ide-tape-don-t-initialize-rq-sector-for-rw-request.patch
0003-block-add-rq-resid_len.patch
0004-block-implement-blk_rq_pos-cur_-sectors-and-conv.patch
0005-block-convert-to-pos-and-nr_sectors-accessors.patch
0006-ide-convert-to-rq-pos-and-nr_sectors-accessors.patch
0007-block-drop-request-hard_-and-nr_sectors.patch
0008-block-cleanup-rq-data_len-usages.patch
0009-ide-cleanup-rq-data_len-usages.patch
0010-block-hide-request-sector-and-data_len.patch
0011-block-blk_rq_-cur_-_-sectors-bytes-usage-cleanup.patch
This patchset is on top of
linux-2.6-block#for-2.6.31 (f68adec3c7155a8bbf32a90cb4c4d0737df045d9)
+ linux-2.6-ide#for-next (03682411b1ccd38cbde2e9a6ab43884ff34fbefc)
and contains the following changes.
arch/um/drivers/ubd_kern.c | 2
block/as-iosched.c | 18 +++--
block/blk-barrier.c | 4 -
block/blk-core.c | 100 ++++++++++++-------------------
block/blk-map.c | 2
block/blk-merge.c | 46 ++------------
block/blk.h | 1
block/bsg.c | 8 +-
block/cfq-iosched.c | 30 ++++-----
block/deadline-iosched.c | 2
block/elevator.c | 22 +++---
block/scsi_ioctl.c | 2
drivers/ata/libata-scsi.c | 2
drivers/block/DAC960.c | 6 -
drivers/block/amiflop.c | 6 -
drivers/block/ataflop.c | 10 +--
drivers/block/cciss.c | 35 ++++------
drivers/block/cpqarray.c | 9 +-
drivers/block/floppy.c | 54 ++++++++--------
drivers/block/hd.c | 14 ++--
drivers/block/nbd.c | 19 +----
drivers/block/paride/pcd.c | 4 -
drivers/block/paride/pd.c | 8 +-
drivers/block/paride/pf.c | 8 +-
drivers/block/ps3disk.c | 9 +-
drivers/block/sunvdc.c | 2
drivers/block/swim3.c | 34 +++++-----
drivers/block/sx8.c | 6 -
drivers/block/ub.c | 16 ++--
drivers/block/viodasd.c | 8 +-
drivers/block/virtio_blk.c | 2
drivers/block/xd.c | 4 -
drivers/block/xen-blkfront.c | 11 +--
drivers/block/xsysace.c | 25 ++++---
drivers/block/z2ram.c | 6 -
drivers/cdrom/gdrom.c | 6 -
drivers/cdrom/viocd.c | 2
drivers/ide/ide-atapi.c | 13 ----
drivers/ide/ide-cd.c | 44 ++++---------
drivers/ide/ide-disk.c | 8 +-
drivers/ide/ide-dma.c | 2
drivers/ide/ide-floppy.c | 10 +--
drivers/ide/ide-io.c | 10 +--
drivers/ide/ide-lib.c | 2
drivers/ide/ide-tape.c | 11 +--
drivers/ide/ide-taskfile.c | 2
drivers/ide/pdc202xx_old.c | 2
drivers/ide/tc86c001.c | 2
drivers/ide/tx4939ide.c | 2
drivers/memstick/core/mspro_block.c | 6 -
drivers/message/fusion/mptsas.c | 21 +++---
drivers/message/i2o/i2o_block.c | 28 +++-----
drivers/mmc/card/block.c | 10 +--
drivers/mtd/mtd_blkdevs.c | 7 +-
drivers/s390/block/dasd.c | 2
drivers/s390/block/dasd_diag.c | 5 -
drivers/s390/block/dasd_eckd.c | 6 -
drivers/s390/block/dasd_fba.c | 7 +-
drivers/s390/char/tape_34xx.c | 2
drivers/s390/char/tape_3590.c | 2
drivers/s390/char/tape_block.c | 2
drivers/sbus/char/jsflash.c | 4 -
drivers/scsi/eata.c | 24 +++----
drivers/scsi/libsas/sas_expander.c | 14 +---
drivers/scsi/libsas/sas_host_smp.c | 52 ++++++++--------
drivers/scsi/lpfc/lpfc_scsi.c | 22 +++---
drivers/scsi/mpt2sas/mpt2sas_transport.c | 23 +++----
drivers/scsi/osd/osd_initiator.c | 4 -
drivers/scsi/scsi_lib.c | 46 ++++++--------
drivers/scsi/scsi_tgt_lib.c | 2
drivers/scsi/sd.c | 24 +++----
drivers/scsi/sd_dif.c | 2
drivers/scsi/sg.c | 2
drivers/scsi/sr.c | 15 ++--
drivers/scsi/st.c | 2
drivers/scsi/u14-34f.c | 22 +++---
fs/exofs/osd.c | 4 -
include/linux/bio.h | 6 -
include/linux/blkdev.h | 56 ++++++++++-------
include/linux/elevator.h | 2
include/scsi/scsi_cmnd.h | 2
kernel/trace/blktrace.c | 16 ++--
82 files changed, 508 insertions(+), 585 deletions(-)
Thanks.
--
tejun
[L] http://lkml.org/lkml/2009/4/29/173
^ permalink raw reply [flat|nested] 73+ messages in thread
* [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Hello,
Upon ack, please pull from the following git tree.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
This is the second take of block-unify-sector-and-data_len patchset.
The primary goal of this patchset is to consolidate all the similar
bug slightly different current position and data length fields in
struct request. For detailed description, please read the description
in the last take[L]. Changes from the last take[L] are
* Acked-by:'s added
* osd resid_len conversion was missing as pointed out by Boaz Harrosh,
fixed.
* patch to cleanup request length accessor usages after the conversion
added.
This patchset contains the following eleven patches.
0001-nbd-don-t-clear-rq-sector-and-nr_sectors-unnecessa.patch
0002-ide-tape-don-t-initialize-rq-sector-for-rw-request.patch
0003-block-add-rq-resid_len.patch
0004-block-implement-blk_rq_pos-cur_-sectors-and-conv.patch
0005-block-convert-to-pos-and-nr_sectors-accessors.patch
0006-ide-convert-to-rq-pos-and-nr_sectors-accessors.patch
0007-block-drop-request-hard_-and-nr_sectors.patch
0008-block-cleanup-rq-data_len-usages.patch
0009-ide-cleanup-rq-data_len-usages.patch
0010-block-hide-request-sector-and-data_len.patch
0011-block-blk_rq_-cur_-_-sectors-bytes-usage-cleanup.patch
This patchset is on top of
linux-2.6-block#for-2.6.31 (f68adec3c7155a8bbf32a90cb4c4d0737df045d9)
+ linux-2.6-ide#for-next (03682411b1ccd38cbde2e9a6ab43884ff34fbefc)
and contains the following changes.
arch/um/drivers/ubd_kern.c | 2
block/as-iosched.c | 18 +++--
block/blk-barrier.c | 4 -
block/blk-core.c | 100 ++++++++++++-------------------
block/blk-map.c | 2
block/blk-merge.c | 46 ++------------
block/blk.h | 1
block/bsg.c | 8 +-
block/cfq-iosched.c | 30 ++++-----
block/deadline-iosched.c | 2
block/elevator.c | 22 +++---
block/scsi_ioctl.c | 2
drivers/ata/libata-scsi.c | 2
drivers/block/DAC960.c | 6 -
drivers/block/amiflop.c | 6 -
drivers/block/ataflop.c | 10 +--
drivers/block/cciss.c | 35 ++++------
drivers/block/cpqarray.c | 9 +-
drivers/block/floppy.c | 54 ++++++++--------
drivers/block/hd.c | 14 ++--
drivers/block/nbd.c | 19 +----
drivers/block/paride/pcd.c | 4 -
drivers/block/paride/pd.c | 8 +-
drivers/block/paride/pf.c | 8 +-
drivers/block/ps3disk.c | 9 +-
drivers/block/sunvdc.c | 2
drivers/block/swim3.c | 34 +++++-----
drivers/block/sx8.c | 6 -
drivers/block/ub.c | 16 ++--
drivers/block/viodasd.c | 8 +-
drivers/block/virtio_blk.c | 2
drivers/block/xd.c | 4 -
drivers/block/xen-blkfront.c | 11 +--
drivers/block/xsysace.c | 25 ++++---
drivers/block/z2ram.c | 6 -
drivers/cdrom/gdrom.c | 6 -
drivers/cdrom/viocd.c | 2
drivers/ide/ide-atapi.c | 13 ----
drivers/ide/ide-cd.c | 44 ++++---------
drivers/ide/ide-disk.c | 8 +-
drivers/ide/ide-dma.c | 2
drivers/ide/ide-floppy.c | 10 +--
drivers/ide/ide-io.c | 10 +--
drivers/ide/ide-lib.c | 2
drivers/ide/ide-tape.c | 11 +--
drivers/ide/ide-taskfile.c | 2
drivers/ide/pdc202xx_old.c | 2
drivers/ide/tc86c001.c | 2
drivers/ide/tx4939ide.c | 2
drivers/memstick/core/mspro_block.c | 6 -
drivers/message/fusion/mptsas.c | 21 +++---
drivers/message/i2o/i2o_block.c | 28 +++-----
drivers/mmc/card/block.c | 10 +--
drivers/mtd/mtd_blkdevs.c | 7 +-
drivers/s390/block/dasd.c | 2
drivers/s390/block/dasd_diag.c | 5 -
drivers/s390/block/dasd_eckd.c | 6 -
drivers/s390/block/dasd_fba.c | 7 +-
drivers/s390/char/tape_34xx.c | 2
drivers/s390/char/tape_3590.c | 2
drivers/s390/char/tape_block.c | 2
drivers/sbus/char/jsflash.c | 4 -
drivers/scsi/eata.c | 24 +++----
drivers/scsi/libsas/sas_expander.c | 14 +---
drivers/scsi/libsas/sas_host_smp.c | 52 ++++++++--------
drivers/scsi/lpfc/lpfc_scsi.c | 22 +++---
drivers/scsi/mpt2sas/mpt2sas_transport.c | 23 +++----
drivers/scsi/osd/osd_initiator.c | 4 -
drivers/scsi/scsi_lib.c | 46 ++++++--------
drivers/scsi/scsi_tgt_lib.c | 2
drivers/scsi/sd.c | 24 +++----
drivers/scsi/sd_dif.c | 2
drivers/scsi/sg.c | 2
drivers/scsi/sr.c | 15 ++--
drivers/scsi/st.c | 2
drivers/scsi/u14-34f.c | 22 +++---
fs/exofs/osd.c | 4 -
include/linux/bio.h | 6 -
include/linux/blkdev.h | 56 ++++++++++-------
include/linux/elevator.h | 2
include/scsi/scsi_cmnd.h | 2
kernel/trace/blktrace.c | 16 ++--
82 files changed, 508 insertions(+), 585 deletions(-)
Thanks.
--
tejun
[L] http://lkml.org/lkml/2009/4/29/173
^ permalink raw reply [flat|nested] 73+ messages in thread
* [PATCH 01/11] nbd: don't clear rq->sector and nr_sectors unnecessarily
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
There's no reason to clear rq->sector and nr_sectors after calling
blk_rq_init(). They're guaranteed to be clear. Drop unnecessary
clearing.
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul Clements <paul.clements@steeleye.com>
---
drivers/block/nbd.c | 7 -------
1 files changed, 0 insertions(+), 7 deletions(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 4d6de4f..a9ab8be 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -580,13 +580,6 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
blk_rq_init(NULL, &sreq);
sreq.cmd_type = REQ_TYPE_SPECIAL;
nbd_cmd(&sreq) = NBD_CMD_DISC;
- /*
- * Set these to sane values in case server implementation
- * fails to check the request type first and also to keep
- * debugging output cleaner.
- */
- sreq.sector = 0;
- sreq.nr_sectors = 0;
if (!lo->sock)
return -EINVAL;
nbd_send_req(lo, &sreq);
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 01/11] nbd: don't clear rq->sector and nr_sectors unnecessarily
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
There's no reason to clear rq->sector and nr_sectors after calling
blk_rq_init(). They're guaranteed to be clear. Drop unnecessary
clearing.
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul Clements <paul.clements@steeleye.com>
---
drivers/block/nbd.c | 7 -------
1 files changed, 0 insertions(+), 7 deletions(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 4d6de4f..a9ab8be 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -580,13 +580,6 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *lo,
blk_rq_init(NULL, &sreq);
sreq.cmd_type = REQ_TYPE_SPECIAL;
nbd_cmd(&sreq) = NBD_CMD_DISC;
- /*
- * Set these to sane values in case server implementation
- * fails to check the request type first and also to keep
- * debugging output cleaner.
- */
- sreq.sector = 0;
- sreq.nr_sectors = 0;
if (!lo->sock)
return -EINVAL;
nbd_send_req(lo, &sreq);
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 02/11] ide-tape: don't initialize rq->sector for rw requests
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
rq->sector is set to the tape->first_frame but it's never actually
used and not even in the correct unit (512 byte sectors). Don't set
it.
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/ide/ide-tape.c | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 8dfc688..7149224 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -892,7 +892,6 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd[13] = cmd;
rq->rq_disk = tape->disk;
- rq->sector = tape->first_frame;
if (size) {
ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 02/11] ide-tape: don't initialize rq->sector for rw requests
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
rq->sector is set to the tape->first_frame but it's never actually
used and not even in the correct unit (512 byte sectors). Don't set
it.
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/ide/ide-tape.c | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 8dfc688..7149224 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -892,7 +892,6 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd[13] = cmd;
rq->rq_disk = tape->disk;
- rq->sector = tape->first_frame;
if (size) {
ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 03/11] block: add rq->resid_len
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo, Doug Gilbert, Darrick J. Wong
rq->data_len served two purposes - the length of data buffer on issue
and the residual count on completion. This duality creates some
headaches.
First of all, block layer and low level drivers can't really determine
what rq->data_len contains while a request is executing. It could be
the total request length or it coulde be anything else one of the
lower layers is using to keep track of residual count. This
complicates things because blk_rq_bytes() and thus
[__]blk_end_request_all() relies on rq->data_len for PC commands.
Drivers which want to report residual count should first cache the
total request length, update rq->data_len and then complete the
request with the cached data length.
Secondly, it makes requests default to reporting full residual count,
ie. reporting that no data transfer occurred. The residual count is
an exception not the norm; however, the driver should clear
rq->data_len to zero to signify the normal cases while leaving it
alone means no data transfer occurred at all. This reverse default
behavior complicates code unnecessarily and renders block PC on some
drivers (ide-tape/floppy) unuseable.
This patch adds rq->resid_len which is used only for residual count.
While at it, remove now unnecessasry blk_rq_bytes() caching in
ide_pc_intr() as rq->data_len is not changed anymore.
Boaz: spotted missing conversion in osd.
[ Impact: cleanup residual count handling, report 0 resid by default ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
---
block/bsg.c | 8 +++---
block/scsi_ioctl.c | 2 +-
drivers/block/cciss.c | 13 +++-------
drivers/block/ub.c | 6 +---
drivers/ide/ide-atapi.c | 9 +------
drivers/ide/ide-cd.c | 13 ++++------
drivers/ide/ide-tape.c | 4 +-
drivers/message/fusion/mptsas.c | 3 +-
drivers/scsi/libsas/sas_expander.c | 6 +----
drivers/scsi/libsas/sas_host_smp.c | 38 +++++++++++++++--------------
drivers/scsi/mpt2sas/mpt2sas_transport.c | 4 +--
drivers/scsi/scsi_lib.c | 24 +++++++++---------
drivers/scsi/sg.c | 2 +-
drivers/scsi/st.c | 2 +-
fs/exofs/osd.c | 4 +-
include/linux/blkdev.h | 1 +
16 files changed, 59 insertions(+), 80 deletions(-)
diff --git a/block/bsg.c b/block/bsg.c
index 206060e..2d746e3 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -445,14 +445,14 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
}
if (rq->next_rq) {
- hdr->dout_resid = rq->data_len;
- hdr->din_resid = rq->next_rq->data_len;
+ hdr->dout_resid = rq->resid_len;
+ hdr->din_resid = rq->next_rq->resid_len;
blk_rq_unmap_user(bidi_bio);
blk_put_request(rq->next_rq);
} else if (rq_data_dir(rq) == READ)
- hdr->din_resid = rq->data_len;
+ hdr->din_resid = rq->resid_len;
else
- hdr->dout_resid = rq->data_len;
+ hdr->dout_resid = rq->resid_len;
/*
* If the request generated a negative error number, return it
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 58cf456..a9670dd 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -230,7 +230,7 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
hdr->info = 0;
if (hdr->masked_status || hdr->host_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
- hdr->resid = rq->data_len;
+ hdr->resid = rq->resid_len;
hdr->sb_len_wr = 0;
if (rq->sense_len && hdr->sbp) {
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4d4d5e0..f22d493 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1299,7 +1299,6 @@ static void cciss_softirq_done(struct request *rq)
{
CommandList_struct *cmd = rq->completion_data;
ctlr_info_t *h = hba[cmd->ctlr];
- unsigned int nr_bytes;
unsigned long flags;
u64bit temp64;
int i, ddir;
@@ -1321,15 +1320,11 @@ static void cciss_softirq_done(struct request *rq)
printk("Done with %p\n", rq);
#endif /* CCISS_DEBUG */
- /*
- * Store the full size and set the residual count for pc requests
- */
- nr_bytes = blk_rq_bytes(rq);
+ /* set the residual count for pc requests */
if (blk_pc_request(rq))
- rq->data_len = cmd->err_info->ResidualCnt;
+ rq->resid_len = cmd->err_info->ResidualCnt;
- if (blk_end_request(rq, (rq->errors == 0) ? 0 : -EIO, nr_bytes))
- BUG();
+ blk_end_request_all(rq, (rq->errors == 0) ? 0 : -EIO);
spin_lock_irqsave(&h->lock, flags);
cmd_free(h, cmd, 1);
@@ -2691,7 +2686,7 @@ static inline void complete_command(ctlr_info_t *h, CommandList_struct *cmd,
printk(KERN_WARNING "cciss: cmd %p has"
" completed with data underrun "
"reported\n", cmd);
- cmd->rq->data_len = cmd->err_info->ResidualCnt;
+ cmd->rq->resid_len = cmd->err_info->ResidualCnt;
}
break;
case CMD_DATA_OVERRUN:
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 689cd27..8c2cc71 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -783,10 +783,8 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
if (cmd->error == 0) {
if (blk_pc_request(rq)) {
- if (cmd->act_len >= rq->data_len)
- rq->data_len = 0;
- else
- rq->data_len -= cmd->act_len;
+ if (cmd->act_len < rq->data_len)
+ rq->resid_len = rq->data_len - cmd->act_len;
scsi_status = 0;
} else {
if (cmd->act_len != cmd->len) {
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index afe5a43..e4a02a0 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -367,7 +367,6 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
/* No more interrupts */
if ((stat & ATA_DRQ) == 0) {
int uptodate, error;
- unsigned int done;
debug_log("Packet command completed, %d bytes transferred\n",
pc->xferred);
@@ -406,12 +405,6 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
dsc = 1;
- /*
- * ->pc_callback() might change rq->data_len for
- * residual count, cache total length.
- */
- done = blk_rq_bytes(rq);
-
/* Command finished - Call the callback function */
uptodate = drive->pc_callback(drive, dsc);
@@ -431,7 +424,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
error = uptodate ? 0 : -EIO;
}
- ide_complete_rq(drive, error, done);
+ ide_complete_rq(drive, error, blk_rq_bytes(rq));
return ide_stopped;
}
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index a75e4ee..cc8ac5b 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -518,7 +518,7 @@ int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
error = blk_execute_rq(drive->queue, info->disk, rq, 0);
if (buffer)
- *bufflen = rq->data_len;
+ *bufflen = rq->resid_len;
flags = rq->cmd_flags;
blk_put_request(rq);
@@ -706,11 +706,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
out_end:
if (blk_pc_request(rq) && rc == 0) {
- unsigned int dlen = rq->data_len;
-
- rq->data_len = 0;
-
- if (blk_end_request(rq, 0, dlen))
+ if (blk_end_request(rq, 0, rq->data_len))
BUG();
hwif->rq = NULL;
@@ -739,9 +735,10 @@ out_end:
nsectors = 1;
if (blk_fs_request(rq) == 0) {
- rq->data_len -= (cmd->nbytes - cmd->nleft);
+ rq->resid_len = rq->data_len -
+ (cmd->nbytes - cmd->nleft);
if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
- rq->data_len += cmd->last_xfer_len;
+ rq->resid_len += cmd->last_xfer_len;
}
ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 7149224..3813a0e 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -380,7 +380,7 @@ static int ide_tape_callback(ide_drive_t *drive, int dsc)
}
tape->first_frame += blocks;
- rq->data_len -= blocks * tape->blk_size;
+ rq->resid_len = blk_rq_bytes(rq) - blocks * tape->blk_size;
if (pc->error) {
uptodate = 0;
@@ -903,7 +903,7 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
blk_execute_rq(drive->queue, tape->disk, rq, 0);
/* calculate the number of transferred bytes and update buffer state */
- size -= rq->data_len;
+ size -= rq->resid_len;
tape->cur = tape->buf;
if (cmd == REQ_IDETAPE_READ)
tape->valid = size;
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index a9019f0..5d5f347 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
memcpy(req->sense, smprep, sizeof(*smprep));
req->sense_len = sizeof(*smprep);
- req->data_len = 0;
- rsp->data_len -= smprep->ResponseDataLength;
+ rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
} else {
printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
ioc->name, __func__);
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 3da02e4..6605ec9 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
bio_data(rsp->bio), rsp->data_len);
if (ret > 0) {
/* positive number is the untransferred residual */
- rsp->data_len = ret;
- req->data_len = 0;
+ rsp->resid_len = ret;
ret = 0;
- } else if (ret == 0) {
- rsp->data_len = 0;
- req->data_len = 0;
}
return ret;
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
index d110a36..89952ed 100644
--- a/drivers/scsi/libsas/sas_host_smp.c
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -134,7 +134,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
{
u8 *req_data = NULL, *resp_data = NULL, *buf;
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
- int error = -EINVAL, resp_data_len = rsp->data_len;
+ int error = -EINVAL;
/* eight is the minimum size for request and response frames */
if (req->data_len < 8 || rsp->data_len < 8)
@@ -176,17 +176,20 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
resp_data[1] = req_data[1];
resp_data[2] = SMP_RESP_FUNC_UNK;
+ req->resid_len = req->data_len;
+ rsp->resid_len = rsp->data_len;
+
switch (req_data[1]) {
case SMP_REPORT_GENERAL:
- req->data_len -= 8;
- resp_data_len -= 32;
+ req->resid_len -= 8;
+ rsp->resid_len -= 32;
resp_data[2] = SMP_RESP_FUNC_ACC;
resp_data[9] = sas_ha->num_phys;
break;
case SMP_REPORT_MANUF_INFO:
- req->data_len -= 8;
- resp_data_len -= 64;
+ req->resid_len -= 8;
+ rsp->resid_len -= 64;
resp_data[2] = SMP_RESP_FUNC_ACC;
memcpy(resp_data + 12, shost->hostt->name,
SAS_EXPANDER_VENDOR_ID_LEN);
@@ -199,13 +202,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
break;
case SMP_DISCOVER:
- req->data_len -= 16;
- if ((int)req->data_len < 0) {
- req->data_len = 0;
+ req->resid_len -= 16;
+ if ((int)req->resid_len < 0) {
+ req->resid_len = 0;
error = -EINVAL;
goto out;
}
- resp_data_len -= 56;
+ rsp->resid_len -= 56;
sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
break;
@@ -215,13 +218,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
break;
case SMP_REPORT_PHY_SATA:
- req->data_len -= 16;
- if ((int)req->data_len < 0) {
- req->data_len = 0;
+ req->resid_len -= 16;
+ if ((int)req->resid_len < 0) {
+ req->resid_len = 0;
error = -EINVAL;
goto out;
}
- resp_data_len -= 60;
+ rsp->resid_len -= 60;
sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
break;
@@ -238,13 +241,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
break;
case SMP_PHY_CONTROL:
- req->data_len -= 44;
- if ((int)req->data_len < 0) {
- req->data_len = 0;
+ req->resid_len -= 44;
+ if ((int)req->resid_len < 0) {
+ req->resid_len = 0;
error = -EINVAL;
goto out;
}
- resp_data_len -= 8;
+ rsp->resid_len -= 8;
sas_phy_control(sas_ha, req_data[9], req_data[10],
req_data[32] >> 4, req_data[33] >> 4,
resp_data);
@@ -265,7 +268,6 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
flush_kernel_dcache_page(bio_page(rsp->bio));
kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
local_irq_enable();
- rsp->data_len = resp_data_len;
out:
kfree(req_data);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index e03dc0b..53759c5 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1170,9 +1170,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
req->sense_len = sizeof(*mpi_reply);
- req->data_len = 0;
- rsp->data_len -= mpi_reply->ResponseDataLength;
-
+ rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
} else {
dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
"%s - no reply\n", ioc->name, __func__));
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aa9fc57..7d49ef5 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -240,11 +240,11 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
* is invalid. Prevent the garbage from being misinterpreted
* and prevent security leaks by zeroing out the excess data.
*/
- if (unlikely(req->data_len > 0 && req->data_len <= bufflen))
- memset(buffer + (bufflen - req->data_len), 0, req->data_len);
+ if (unlikely(req->resid_len > 0 && req->resid_len <= bufflen))
+ memset(buffer + (bufflen - req->resid_len), 0, req->resid_len);
if (resid)
- *resid = req->data_len;
+ *resid = req->resid_len;
ret = req->errors;
out:
blk_put_request(req);
@@ -549,7 +549,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
int leftover = (req->hard_nr_sectors << 9);
if (blk_pc_request(req))
- leftover = req->data_len;
+ leftover = req->resid_len;
/* kill remainder if no retrys */
if (error && scsi_noretry_cmd(cmd))
@@ -673,11 +673,11 @@ void scsi_release_buffers(struct scsi_cmnd *cmd)
EXPORT_SYMBOL(scsi_release_buffers);
/*
- * Bidi commands Must be complete as a whole, both sides at once.
- * If part of the bytes were written and lld returned
- * scsi_in()->resid and/or scsi_out()->resid this information will be left
- * in req->data_len and req->next_rq->data_len. The upper-layer driver can
- * decide what to do with this information.
+ * Bidi commands Must be complete as a whole, both sides at once. If
+ * part of the bytes were written and lld returned scsi_in()->resid
+ * and/or scsi_out()->resid this information will be left in
+ * req->resid_len and req->next_rq->resid_len. The upper-layer driver
+ * can decide what to do with this information.
*/
static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
{
@@ -685,8 +685,8 @@ static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
unsigned int dlen = req->data_len;
unsigned int next_dlen = req->next_rq->data_len;
- req->data_len = scsi_out(cmd)->resid;
- req->next_rq->data_len = scsi_in(cmd)->resid;
+ req->resid_len = scsi_out(cmd)->resid;
+ req->next_rq->resid_len = scsi_in(cmd)->resid;
/* The req and req->next_rq have not been completed */
BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
@@ -778,7 +778,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
scsi_end_bidi_request(cmd);
return;
}
- req->data_len = scsi_get_resid(cmd);
+ req->resid_len = scsi_get_resid(cmd);
}
BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 82312df..dec4c70 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1260,7 +1260,7 @@ static void sg_rq_end_io(struct request *rq, int uptodate)
sense = rq->sense;
result = rq->errors;
- resid = rq->data_len;
+ resid = rq->resid_len;
SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
sdp->disk->disk_name, srp->header.pack_id, result));
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index eb24efe..8681b70 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -463,7 +463,7 @@ static void st_scsi_execute_end(struct request *req, int uptodate)
struct scsi_tape *STp = SRpnt->stp;
STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
- STp->buffer->cmdstat.residual = req->data_len;
+ STp->buffer->cmdstat.residual = req->resid_len;
if (SRpnt->waiting)
complete(SRpnt->waiting);
diff --git a/fs/exofs/osd.c b/fs/exofs/osd.c
index b249ae9..06ca926 100644
--- a/fs/exofs/osd.c
+++ b/fs/exofs/osd.c
@@ -50,10 +50,10 @@ int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
/* FIXME: should be include in osd_sense_info */
if (in_resid)
- *in_resid = or->in.req ? or->in.req->data_len : 0;
+ *in_resid = or->in.req ? or->in.req->resid_len : 0;
if (out_resid)
- *out_resid = or->out.req ? or->out.req->data_len : 0;
+ *out_resid = or->out.req ? or->out.req->resid_len : 0;
return ret;
}
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e3726d6..7ab93d9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -229,6 +229,7 @@ struct request {
unsigned int data_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;
+ unsigned int resid_len; /* residual count */
void *sense;
unsigned long deadline;
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 03/11] block: add rq->resid_len
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo, Doug Gilbert, Darrick J. Wong
rq->data_len served two purposes - the length of data buffer on issue
and the residual count on completion. This duality creates some
headaches.
First of all, block layer and low level drivers can't really determine
what rq->data_len contains while a request is executing. It could be
the total request length or it coulde be anything else one of the
lower layers is using to keep track of residual count. This
complicates things because blk_rq_bytes() and thus
[__]blk_end_request_all() relies on rq->data_len for PC commands.
Drivers which want to report residual count should first cache the
total request length, update rq->data_len and then complete the
request with the cached data length.
Secondly, it makes requests default to reporting full residual count,
ie. reporting that no data transfer occurred. The residual count is
an exception not the norm; however, the driver should clear
rq->data_len to zero to signify the normal cases while leaving it
alone means no data transfer occurred at all. This reverse default
behavior complicates code unnecessarily and renders block PC on some
drivers (ide-tape/floppy) unuseable.
This patch adds rq->resid_len which is used only for residual count.
While at it, remove now unnecessasry blk_rq_bytes() caching in
ide_pc_intr() as rq->data_len is not changed anymore.
Boaz: spotted missing conversion in osd.
[ Impact: cleanup residual count handling, report 0 resid by default ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
---
block/bsg.c | 8 +++---
block/scsi_ioctl.c | 2 +-
drivers/block/cciss.c | 13 +++-------
drivers/block/ub.c | 6 +---
drivers/ide/ide-atapi.c | 9 +------
drivers/ide/ide-cd.c | 13 ++++------
drivers/ide/ide-tape.c | 4 +-
drivers/message/fusion/mptsas.c | 3 +-
drivers/scsi/libsas/sas_expander.c | 6 +----
drivers/scsi/libsas/sas_host_smp.c | 38 +++++++++++++++--------------
drivers/scsi/mpt2sas/mpt2sas_transport.c | 4 +--
drivers/scsi/scsi_lib.c | 24 +++++++++---------
drivers/scsi/sg.c | 2 +-
drivers/scsi/st.c | 2 +-
fs/exofs/osd.c | 4 +-
include/linux/blkdev.h | 1 +
16 files changed, 59 insertions(+), 80 deletions(-)
diff --git a/block/bsg.c b/block/bsg.c
index 206060e..2d746e3 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -445,14 +445,14 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
}
if (rq->next_rq) {
- hdr->dout_resid = rq->data_len;
- hdr->din_resid = rq->next_rq->data_len;
+ hdr->dout_resid = rq->resid_len;
+ hdr->din_resid = rq->next_rq->resid_len;
blk_rq_unmap_user(bidi_bio);
blk_put_request(rq->next_rq);
} else if (rq_data_dir(rq) == READ)
- hdr->din_resid = rq->data_len;
+ hdr->din_resid = rq->resid_len;
else
- hdr->dout_resid = rq->data_len;
+ hdr->dout_resid = rq->resid_len;
/*
* If the request generated a negative error number, return it
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 58cf456..a9670dd 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -230,7 +230,7 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
hdr->info = 0;
if (hdr->masked_status || hdr->host_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
- hdr->resid = rq->data_len;
+ hdr->resid = rq->resid_len;
hdr->sb_len_wr = 0;
if (rq->sense_len && hdr->sbp) {
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4d4d5e0..f22d493 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1299,7 +1299,6 @@ static void cciss_softirq_done(struct request *rq)
{
CommandList_struct *cmd = rq->completion_data;
ctlr_info_t *h = hba[cmd->ctlr];
- unsigned int nr_bytes;
unsigned long flags;
u64bit temp64;
int i, ddir;
@@ -1321,15 +1320,11 @@ static void cciss_softirq_done(struct request *rq)
printk("Done with %p\n", rq);
#endif /* CCISS_DEBUG */
- /*
- * Store the full size and set the residual count for pc requests
- */
- nr_bytes = blk_rq_bytes(rq);
+ /* set the residual count for pc requests */
if (blk_pc_request(rq))
- rq->data_len = cmd->err_info->ResidualCnt;
+ rq->resid_len = cmd->err_info->ResidualCnt;
- if (blk_end_request(rq, (rq->errors == 0) ? 0 : -EIO, nr_bytes))
- BUG();
+ blk_end_request_all(rq, (rq->errors == 0) ? 0 : -EIO);
spin_lock_irqsave(&h->lock, flags);
cmd_free(h, cmd, 1);
@@ -2691,7 +2686,7 @@ static inline void complete_command(ctlr_info_t *h, CommandList_struct *cmd,
printk(KERN_WARNING "cciss: cmd %p has"
" completed with data underrun "
"reported\n", cmd);
- cmd->rq->data_len = cmd->err_info->ResidualCnt;
+ cmd->rq->resid_len = cmd->err_info->ResidualCnt;
}
break;
case CMD_DATA_OVERRUN:
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 689cd27..8c2cc71 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -783,10 +783,8 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
if (cmd->error == 0) {
if (blk_pc_request(rq)) {
- if (cmd->act_len >= rq->data_len)
- rq->data_len = 0;
- else
- rq->data_len -= cmd->act_len;
+ if (cmd->act_len < rq->data_len)
+ rq->resid_len = rq->data_len - cmd->act_len;
scsi_status = 0;
} else {
if (cmd->act_len != cmd->len) {
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index afe5a43..e4a02a0 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -367,7 +367,6 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
/* No more interrupts */
if ((stat & ATA_DRQ) == 0) {
int uptodate, error;
- unsigned int done;
debug_log("Packet command completed, %d bytes transferred\n",
pc->xferred);
@@ -406,12 +405,6 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
dsc = 1;
- /*
- * ->pc_callback() might change rq->data_len for
- * residual count, cache total length.
- */
- done = blk_rq_bytes(rq);
-
/* Command finished - Call the callback function */
uptodate = drive->pc_callback(drive, dsc);
@@ -431,7 +424,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
error = uptodate ? 0 : -EIO;
}
- ide_complete_rq(drive, error, done);
+ ide_complete_rq(drive, error, blk_rq_bytes(rq));
return ide_stopped;
}
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index a75e4ee..cc8ac5b 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -518,7 +518,7 @@ int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
error = blk_execute_rq(drive->queue, info->disk, rq, 0);
if (buffer)
- *bufflen = rq->data_len;
+ *bufflen = rq->resid_len;
flags = rq->cmd_flags;
blk_put_request(rq);
@@ -706,11 +706,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
out_end:
if (blk_pc_request(rq) && rc == 0) {
- unsigned int dlen = rq->data_len;
-
- rq->data_len = 0;
-
- if (blk_end_request(rq, 0, dlen))
+ if (blk_end_request(rq, 0, rq->data_len))
BUG();
hwif->rq = NULL;
@@ -739,9 +735,10 @@ out_end:
nsectors = 1;
if (blk_fs_request(rq) == 0) {
- rq->data_len -= (cmd->nbytes - cmd->nleft);
+ rq->resid_len = rq->data_len -
+ (cmd->nbytes - cmd->nleft);
if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
- rq->data_len += cmd->last_xfer_len;
+ rq->resid_len += cmd->last_xfer_len;
}
ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 7149224..3813a0e 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -380,7 +380,7 @@ static int ide_tape_callback(ide_drive_t *drive, int dsc)
}
tape->first_frame += blocks;
- rq->data_len -= blocks * tape->blk_size;
+ rq->resid_len = blk_rq_bytes(rq) - blocks * tape->blk_size;
if (pc->error) {
uptodate = 0;
@@ -903,7 +903,7 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size)
blk_execute_rq(drive->queue, tape->disk, rq, 0);
/* calculate the number of transferred bytes and update buffer state */
- size -= rq->data_len;
+ size -= rq->resid_len;
tape->cur = tape->buf;
if (cmd == REQ_IDETAPE_READ)
tape->valid = size;
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index a9019f0..5d5f347 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
memcpy(req->sense, smprep, sizeof(*smprep));
req->sense_len = sizeof(*smprep);
- req->data_len = 0;
- rsp->data_len -= smprep->ResponseDataLength;
+ rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
} else {
printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
ioc->name, __func__);
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 3da02e4..6605ec9 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
bio_data(rsp->bio), rsp->data_len);
if (ret > 0) {
/* positive number is the untransferred residual */
- rsp->data_len = ret;
- req->data_len = 0;
+ rsp->resid_len = ret;
ret = 0;
- } else if (ret == 0) {
- rsp->data_len = 0;
- req->data_len = 0;
}
return ret;
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
index d110a36..89952ed 100644
--- a/drivers/scsi/libsas/sas_host_smp.c
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -134,7 +134,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
{
u8 *req_data = NULL, *resp_data = NULL, *buf;
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
- int error = -EINVAL, resp_data_len = rsp->data_len;
+ int error = -EINVAL;
/* eight is the minimum size for request and response frames */
if (req->data_len < 8 || rsp->data_len < 8)
@@ -176,17 +176,20 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
resp_data[1] = req_data[1];
resp_data[2] = SMP_RESP_FUNC_UNK;
+ req->resid_len = req->data_len;
+ rsp->resid_len = rsp->data_len;
+
switch (req_data[1]) {
case SMP_REPORT_GENERAL:
- req->data_len -= 8;
- resp_data_len -= 32;
+ req->resid_len -= 8;
+ rsp->resid_len -= 32;
resp_data[2] = SMP_RESP_FUNC_ACC;
resp_data[9] = sas_ha->num_phys;
break;
case SMP_REPORT_MANUF_INFO:
- req->data_len -= 8;
- resp_data_len -= 64;
+ req->resid_len -= 8;
+ rsp->resid_len -= 64;
resp_data[2] = SMP_RESP_FUNC_ACC;
memcpy(resp_data + 12, shost->hostt->name,
SAS_EXPANDER_VENDOR_ID_LEN);
@@ -199,13 +202,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
break;
case SMP_DISCOVER:
- req->data_len -= 16;
- if ((int)req->data_len < 0) {
- req->data_len = 0;
+ req->resid_len -= 16;
+ if ((int)req->resid_len < 0) {
+ req->resid_len = 0;
error = -EINVAL;
goto out;
}
- resp_data_len -= 56;
+ rsp->resid_len -= 56;
sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
break;
@@ -215,13 +218,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
break;
case SMP_REPORT_PHY_SATA:
- req->data_len -= 16;
- if ((int)req->data_len < 0) {
- req->data_len = 0;
+ req->resid_len -= 16;
+ if ((int)req->resid_len < 0) {
+ req->resid_len = 0;
error = -EINVAL;
goto out;
}
- resp_data_len -= 60;
+ rsp->resid_len -= 60;
sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
break;
@@ -238,13 +241,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
break;
case SMP_PHY_CONTROL:
- req->data_len -= 44;
- if ((int)req->data_len < 0) {
- req->data_len = 0;
+ req->resid_len -= 44;
+ if ((int)req->resid_len < 0) {
+ req->resid_len = 0;
error = -EINVAL;
goto out;
}
- resp_data_len -= 8;
+ rsp->resid_len -= 8;
sas_phy_control(sas_ha, req_data[9], req_data[10],
req_data[32] >> 4, req_data[33] >> 4,
resp_data);
@@ -265,7 +268,6 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
flush_kernel_dcache_page(bio_page(rsp->bio));
kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
local_irq_enable();
- rsp->data_len = resp_data_len;
out:
kfree(req_data);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index e03dc0b..53759c5 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1170,9 +1170,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
req->sense_len = sizeof(*mpi_reply);
- req->data_len = 0;
- rsp->data_len -= mpi_reply->ResponseDataLength;
-
+ rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
} else {
dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
"%s - no reply\n", ioc->name, __func__));
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aa9fc57..7d49ef5 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -240,11 +240,11 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
* is invalid. Prevent the garbage from being misinterpreted
* and prevent security leaks by zeroing out the excess data.
*/
- if (unlikely(req->data_len > 0 && req->data_len <= bufflen))
- memset(buffer + (bufflen - req->data_len), 0, req->data_len);
+ if (unlikely(req->resid_len > 0 && req->resid_len <= bufflen))
+ memset(buffer + (bufflen - req->resid_len), 0, req->resid_len);
if (resid)
- *resid = req->data_len;
+ *resid = req->resid_len;
ret = req->errors;
out:
blk_put_request(req);
@@ -549,7 +549,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
int leftover = (req->hard_nr_sectors << 9);
if (blk_pc_request(req))
- leftover = req->data_len;
+ leftover = req->resid_len;
/* kill remainder if no retrys */
if (error && scsi_noretry_cmd(cmd))
@@ -673,11 +673,11 @@ void scsi_release_buffers(struct scsi_cmnd *cmd)
EXPORT_SYMBOL(scsi_release_buffers);
/*
- * Bidi commands Must be complete as a whole, both sides at once.
- * If part of the bytes were written and lld returned
- * scsi_in()->resid and/or scsi_out()->resid this information will be left
- * in req->data_len and req->next_rq->data_len. The upper-layer driver can
- * decide what to do with this information.
+ * Bidi commands Must be complete as a whole, both sides at once. If
+ * part of the bytes were written and lld returned scsi_in()->resid
+ * and/or scsi_out()->resid this information will be left in
+ * req->resid_len and req->next_rq->resid_len. The upper-layer driver
+ * can decide what to do with this information.
*/
static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
{
@@ -685,8 +685,8 @@ static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
unsigned int dlen = req->data_len;
unsigned int next_dlen = req->next_rq->data_len;
- req->data_len = scsi_out(cmd)->resid;
- req->next_rq->data_len = scsi_in(cmd)->resid;
+ req->resid_len = scsi_out(cmd)->resid;
+ req->next_rq->resid_len = scsi_in(cmd)->resid;
/* The req and req->next_rq have not been completed */
BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
@@ -778,7 +778,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
scsi_end_bidi_request(cmd);
return;
}
- req->data_len = scsi_get_resid(cmd);
+ req->resid_len = scsi_get_resid(cmd);
}
BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 82312df..dec4c70 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1260,7 +1260,7 @@ static void sg_rq_end_io(struct request *rq, int uptodate)
sense = rq->sense;
result = rq->errors;
- resid = rq->data_len;
+ resid = rq->resid_len;
SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
sdp->disk->disk_name, srp->header.pack_id, result));
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index eb24efe..8681b70 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -463,7 +463,7 @@ static void st_scsi_execute_end(struct request *req, int uptodate)
struct scsi_tape *STp = SRpnt->stp;
STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
- STp->buffer->cmdstat.residual = req->data_len;
+ STp->buffer->cmdstat.residual = req->resid_len;
if (SRpnt->waiting)
complete(SRpnt->waiting);
diff --git a/fs/exofs/osd.c b/fs/exofs/osd.c
index b249ae9..06ca926 100644
--- a/fs/exofs/osd.c
+++ b/fs/exofs/osd.c
@@ -50,10 +50,10 @@ int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
/* FIXME: should be include in osd_sense_info */
if (in_resid)
- *in_resid = or->in.req ? or->in.req->data_len : 0;
+ *in_resid = or->in.req ? or->in.req->resid_len : 0;
if (out_resid)
- *out_resid = or->out.req ? or->out.req->data_len : 0;
+ *out_resid = or->out.req ? or->out.req->resid_len : 0;
return ret;
}
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e3726d6..7ab93d9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -229,6 +229,7 @@ struct request {
unsigned int data_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;
+ unsigned int resid_len; /* residual count */
void *sense;
unsigned long deadline;
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 04/11] block: implement blk_rq_pos/[cur_]sectors() and convert obvious ones
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
Implement accessors - blk_rq_pos(), blk_rq_sectors() and
blk_rq_cur_sectors() which return rq->sector, rq->hard_nr_sectors and
rq->hard_cur_sectors respectively and convert direct references of the
said fields to the accessors.
This is in preparation of request data length handling cleanup.
const added to struct request * parameter to accessors as suggested by
Geert Uytterhoeven.
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Tested-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
---
block/blk-barrier.c | 2 +-
block/blk-core.c | 2 +-
block/cfq-iosched.c | 2 +-
drivers/block/ps3disk.c | 2 +-
drivers/block/viodasd.c | 6 +++---
drivers/block/xsysace.c | 10 +++++-----
drivers/ide/ide-cd.c | 8 ++++----
drivers/ide/ide-io.c | 4 ++--
drivers/message/i2o/i2o_block.c | 2 +-
drivers/scsi/scsi_lib.c | 2 +-
include/linux/blkdev.h | 23 ++++++++++++++++++++---
kernel/trace/blktrace.c | 4 ++--
12 files changed, 42 insertions(+), 25 deletions(-)
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index c8d0876..c167de5 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -163,7 +163,7 @@ static inline bool start_ordered(struct request_queue *q, struct request **rqp)
* For an empty barrier, there's no actual BAR request, which
* in turn makes POSTFLUSH unnecessary. Mask them off.
*/
- if (!rq->hard_nr_sectors) {
+ if (!blk_rq_sectors(rq)) {
q->ordered &= ~(QUEUE_ORDERED_DO_BAR |
QUEUE_ORDERED_DO_POSTFLUSH);
/*
diff --git a/block/blk-core.c b/block/blk-core.c
index 394c5bd..895e55b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1683,7 +1683,7 @@ static void blk_account_io_done(struct request *req)
unsigned int blk_rq_bytes(struct request *rq)
{
if (blk_fs_request(rq))
- return rq->hard_nr_sectors << 9;
+ return blk_rq_sectors(rq) << 9;
return rq->data_len;
}
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index def0c69..575083a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -760,7 +760,7 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
cfqd->rq_in_driver);
- cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors;
+ cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq);
}
static void cfq_deactivate_request(struct request_queue *q, struct request *rq)
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index f6586e4..c238867 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -136,7 +136,7 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
dev_dbg(&dev->sbd.core,
"%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
__func__, __LINE__, op, n, req->nr_sectors,
- req->hard_nr_sectors);
+ blk_rq_sectors(req));
#endif
start_sector = req->sector * priv->blocking_factor;
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index ecccf65..e821eed 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -368,12 +368,12 @@ static void do_viodasd_request(struct request_queue *q)
blkdev_dequeue_request(req);
/* check that request contains a valid command */
if (!blk_fs_request(req)) {
- viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+ viodasd_end_request(req, -EIO, blk_rq_sectors(req));
continue;
}
/* Try sending the request */
if (send_request(req) != 0)
- viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+ viodasd_end_request(req, -EIO, blk_rq_sectors(req));
}
}
@@ -590,7 +590,7 @@ static int viodasd_handle_read_write(struct vioblocklpevent *bevent)
err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n",
event->xRc, bevent->sub_result, err->msg);
- num_sect = req->hard_nr_sectors;
+ num_sect = blk_rq_sectors(req);
}
qlock = req->q->queue_lock;
spin_lock_irqsave(qlock, irq_flags);
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index b1e1d7e..5722931 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -645,8 +645,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
/* Okay, it's a data request, set it up for transfer */
dev_dbg(ace->dev,
- "request: sec=%llx hcnt=%lx, ccnt=%x, dir=%i\n",
- (unsigned long long) req->sector, req->hard_nr_sectors,
+ "request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
+ (unsigned long long) req->sector, blk_rq_sectors(req),
req->current_nr_sectors, rq_data_dir(req));
ace->req = req;
@@ -654,7 +654,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
ace->data_count = req->current_nr_sectors * ACE_BUF_PER_SECTOR;
ace_out32(ace, ACE_MPULBA, req->sector & 0x0FFFFFFF);
- count = req->hard_nr_sectors;
+ count = blk_rq_sectors(req);
if (rq_data_dir(req)) {
/* Kick off write request */
dev_dbg(ace->dev, "write data\n");
@@ -719,8 +719,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
/* bio finished; is there another one? */
if (__blk_end_request(ace->req, 0,
blk_rq_cur_bytes(ace->req))) {
- /* dev_dbg(ace->dev, "next block; h=%li c=%i\n",
- * ace->req->hard_nr_sectors,
+ /* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
+ * blk_rq_sectors(ace->req),
* ace->req->current_nr_sectors);
*/
ace->data_ptr = ace->req->buffer;
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index cc8ac5b..474b283 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -729,7 +729,7 @@ out_end:
if (blk_pc_request(rq))
nsectors = (rq->data_len + 511) >> 9;
else
- nsectors = rq->hard_nr_sectors;
+ nsectors = blk_rq_sectors(rq);
if (nsectors == 0)
nsectors = 1;
@@ -874,7 +874,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
return ide_issue_pc(drive, &cmd);
out_end:
- nsectors = rq->hard_nr_sectors;
+ nsectors = blk_rq_sectors(rq);
if (nsectors == 0)
nsectors = 1;
@@ -1358,8 +1358,8 @@ static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
{
int hard_sect = queue_hardsect_size(q);
- long block = (long)rq->hard_sector / (hard_sect >> 9);
- unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
+ long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
+ unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
memset(rq->cmd, 0, BLK_MAX_CDB);
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index a0309ea..df23bcb 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -118,7 +118,7 @@ unsigned int ide_rq_bytes(struct request *rq)
if (blk_pc_request(rq))
return rq->data_len;
else
- return rq->hard_cur_sectors << 9;
+ return blk_rq_cur_sectors(rq) << 9;
}
EXPORT_SYMBOL_GPL(ide_rq_bytes);
@@ -133,7 +133,7 @@ int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes)
* and complete the whole request right now
*/
if (blk_noretry_request(rq) && error <= 0)
- nr_bytes = rq->hard_nr_sectors << 9;
+ nr_bytes = blk_rq_sectors(rq) << 9;
rc = ide_end_rq(drive, rq, error, nr_bytes);
if (rc == 0)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 221317e..56e60f0 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -427,7 +427,7 @@ static void i2o_block_end_request(struct request *req, int error,
unsigned long flags;
if (blk_end_request(req, error, nr_bytes)) {
- int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT);
+ int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
if (blk_pc_request(req))
leftover = req->data_len;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 7d49ef5..9ff0ca9 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -546,7 +546,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
* to queue the remainder of them.
*/
if (blk_end_request(req, error, bytes)) {
- int leftover = (req->hard_nr_sectors << 9);
+ int leftover = blk_rq_sectors(req) << 9;
if (blk_pc_request(req))
leftover = req->resid_len;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7ab93d9..b921d91 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -833,13 +833,30 @@ static inline void blk_run_address_space(struct address_space *mapping)
extern void blkdev_dequeue_request(struct request *req);
/*
- * blk_end_request() takes bytes instead of sectors as a complete size.
- * blk_rq_bytes() returns bytes left to complete in the entire request.
- * blk_rq_cur_bytes() returns bytes left to complete in the current segment.
+ * blk_rq_pos() : the current sector
+ * blk_rq_bytes() : bytes left in the entire request
+ * blk_rq_cur_bytes() : bytes left in the current segment
+ * blk_rq_sectors() : sectors left in the entire request
+ * blk_rq_cur_sectors() : sectors left in the current segment
*/
+static inline sector_t blk_rq_pos(const struct request *rq)
+{
+ return rq->hard_sector;
+}
+
extern unsigned int blk_rq_bytes(struct request *rq);
extern unsigned int blk_rq_cur_bytes(struct request *rq);
+static inline unsigned int blk_rq_sectors(const struct request *rq)
+{
+ return rq->hard_nr_sectors;
+}
+
+static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
+{
+ return rq->hard_cur_sectors;
+}
+
/*
* Request completion related functions.
*
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 921ef5d..42f1c11 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -646,7 +646,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
rq->cmd_len, rq->cmd);
} else {
what |= BLK_TC_ACT(BLK_TC_FS);
- __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
rw, what, rq->errors, 0, NULL);
}
}
@@ -857,7 +857,7 @@ void blk_add_driver_data(struct request_queue *q,
__blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
rq->errors, len, data);
else
- __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
0, BLK_TA_DRV_DATA, rq->errors, len, data);
}
EXPORT_SYMBOL_GPL(blk_add_driver_data);
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 04/11] block: implement blk_rq_pos/[cur_]sectors() and convert obvious ones
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
Implement accessors - blk_rq_pos(), blk_rq_sectors() and
blk_rq_cur_sectors() which return rq->sector, rq->hard_nr_sectors and
rq->hard_cur_sectors respectively and convert direct references of the
said fields to the accessors.
This is in preparation of request data length handling cleanup.
const added to struct request * parameter to accessors as suggested by
Geert Uytterhoeven.
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Tested-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
---
block/blk-barrier.c | 2 +-
block/blk-core.c | 2 +-
block/cfq-iosched.c | 2 +-
drivers/block/ps3disk.c | 2 +-
drivers/block/viodasd.c | 6 +++---
drivers/block/xsysace.c | 10 +++++-----
drivers/ide/ide-cd.c | 8 ++++----
drivers/ide/ide-io.c | 4 ++--
drivers/message/i2o/i2o_block.c | 2 +-
drivers/scsi/scsi_lib.c | 2 +-
include/linux/blkdev.h | 23 ++++++++++++++++++++---
kernel/trace/blktrace.c | 4 ++--
12 files changed, 42 insertions(+), 25 deletions(-)
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index c8d0876..c167de5 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -163,7 +163,7 @@ static inline bool start_ordered(struct request_queue *q, struct request **rqp)
* For an empty barrier, there's no actual BAR request, which
* in turn makes POSTFLUSH unnecessary. Mask them off.
*/
- if (!rq->hard_nr_sectors) {
+ if (!blk_rq_sectors(rq)) {
q->ordered &= ~(QUEUE_ORDERED_DO_BAR |
QUEUE_ORDERED_DO_POSTFLUSH);
/*
diff --git a/block/blk-core.c b/block/blk-core.c
index 394c5bd..895e55b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1683,7 +1683,7 @@ static void blk_account_io_done(struct request *req)
unsigned int blk_rq_bytes(struct request *rq)
{
if (blk_fs_request(rq))
- return rq->hard_nr_sectors << 9;
+ return blk_rq_sectors(rq) << 9;
return rq->data_len;
}
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index def0c69..575083a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -760,7 +760,7 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
cfqd->rq_in_driver);
- cfqd->last_position = rq->hard_sector + rq->hard_nr_sectors;
+ cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq);
}
static void cfq_deactivate_request(struct request_queue *q, struct request *rq)
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index f6586e4..c238867 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -136,7 +136,7 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
dev_dbg(&dev->sbd.core,
"%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
__func__, __LINE__, op, n, req->nr_sectors,
- req->hard_nr_sectors);
+ blk_rq_sectors(req));
#endif
start_sector = req->sector * priv->blocking_factor;
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index ecccf65..e821eed 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -368,12 +368,12 @@ static void do_viodasd_request(struct request_queue *q)
blkdev_dequeue_request(req);
/* check that request contains a valid command */
if (!blk_fs_request(req)) {
- viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+ viodasd_end_request(req, -EIO, blk_rq_sectors(req));
continue;
}
/* Try sending the request */
if (send_request(req) != 0)
- viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+ viodasd_end_request(req, -EIO, blk_rq_sectors(req));
}
}
@@ -590,7 +590,7 @@ static int viodasd_handle_read_write(struct vioblocklpevent *bevent)
err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n",
event->xRc, bevent->sub_result, err->msg);
- num_sect = req->hard_nr_sectors;
+ num_sect = blk_rq_sectors(req);
}
qlock = req->q->queue_lock;
spin_lock_irqsave(qlock, irq_flags);
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index b1e1d7e..5722931 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -645,8 +645,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
/* Okay, it's a data request, set it up for transfer */
dev_dbg(ace->dev,
- "request: sec=%llx hcnt=%lx, ccnt=%x, dir=%i\n",
- (unsigned long long) req->sector, req->hard_nr_sectors,
+ "request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
+ (unsigned long long) req->sector, blk_rq_sectors(req),
req->current_nr_sectors, rq_data_dir(req));
ace->req = req;
@@ -654,7 +654,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
ace->data_count = req->current_nr_sectors * ACE_BUF_PER_SECTOR;
ace_out32(ace, ACE_MPULBA, req->sector & 0x0FFFFFFF);
- count = req->hard_nr_sectors;
+ count = blk_rq_sectors(req);
if (rq_data_dir(req)) {
/* Kick off write request */
dev_dbg(ace->dev, "write data\n");
@@ -719,8 +719,8 @@ static void ace_fsm_dostate(struct ace_device *ace)
/* bio finished; is there another one? */
if (__blk_end_request(ace->req, 0,
blk_rq_cur_bytes(ace->req))) {
- /* dev_dbg(ace->dev, "next block; h=%li c=%i\n",
- * ace->req->hard_nr_sectors,
+ /* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
+ * blk_rq_sectors(ace->req),
* ace->req->current_nr_sectors);
*/
ace->data_ptr = ace->req->buffer;
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index cc8ac5b..474b283 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -729,7 +729,7 @@ out_end:
if (blk_pc_request(rq))
nsectors = (rq->data_len + 511) >> 9;
else
- nsectors = rq->hard_nr_sectors;
+ nsectors = blk_rq_sectors(rq);
if (nsectors == 0)
nsectors = 1;
@@ -874,7 +874,7 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
return ide_issue_pc(drive, &cmd);
out_end:
- nsectors = rq->hard_nr_sectors;
+ nsectors = blk_rq_sectors(rq);
if (nsectors == 0)
nsectors = 1;
@@ -1358,8 +1358,8 @@ static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
{
int hard_sect = queue_hardsect_size(q);
- long block = (long)rq->hard_sector / (hard_sect >> 9);
- unsigned long blocks = rq->hard_nr_sectors / (hard_sect >> 9);
+ long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
+ unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
memset(rq->cmd, 0, BLK_MAX_CDB);
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index a0309ea..df23bcb 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -118,7 +118,7 @@ unsigned int ide_rq_bytes(struct request *rq)
if (blk_pc_request(rq))
return rq->data_len;
else
- return rq->hard_cur_sectors << 9;
+ return blk_rq_cur_sectors(rq) << 9;
}
EXPORT_SYMBOL_GPL(ide_rq_bytes);
@@ -133,7 +133,7 @@ int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes)
* and complete the whole request right now
*/
if (blk_noretry_request(rq) && error <= 0)
- nr_bytes = rq->hard_nr_sectors << 9;
+ nr_bytes = blk_rq_sectors(rq) << 9;
rc = ide_end_rq(drive, rq, error, nr_bytes);
if (rc == 0)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 221317e..56e60f0 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -427,7 +427,7 @@ static void i2o_block_end_request(struct request *req, int error,
unsigned long flags;
if (blk_end_request(req, error, nr_bytes)) {
- int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT);
+ int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
if (blk_pc_request(req))
leftover = req->data_len;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 7d49ef5..9ff0ca9 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -546,7 +546,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
* to queue the remainder of them.
*/
if (blk_end_request(req, error, bytes)) {
- int leftover = (req->hard_nr_sectors << 9);
+ int leftover = blk_rq_sectors(req) << 9;
if (blk_pc_request(req))
leftover = req->resid_len;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7ab93d9..b921d91 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -833,13 +833,30 @@ static inline void blk_run_address_space(struct address_space *mapping)
extern void blkdev_dequeue_request(struct request *req);
/*
- * blk_end_request() takes bytes instead of sectors as a complete size.
- * blk_rq_bytes() returns bytes left to complete in the entire request.
- * blk_rq_cur_bytes() returns bytes left to complete in the current segment.
+ * blk_rq_pos() : the current sector
+ * blk_rq_bytes() : bytes left in the entire request
+ * blk_rq_cur_bytes() : bytes left in the current segment
+ * blk_rq_sectors() : sectors left in the entire request
+ * blk_rq_cur_sectors() : sectors left in the current segment
*/
+static inline sector_t blk_rq_pos(const struct request *rq)
+{
+ return rq->hard_sector;
+}
+
extern unsigned int blk_rq_bytes(struct request *rq);
extern unsigned int blk_rq_cur_bytes(struct request *rq);
+static inline unsigned int blk_rq_sectors(const struct request *rq)
+{
+ return rq->hard_nr_sectors;
+}
+
+static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
+{
+ return rq->hard_cur_sectors;
+}
+
/*
* Request completion related functions.
*
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 921ef5d..42f1c11 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -646,7 +646,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
rq->cmd_len, rq->cmd);
} else {
what |= BLK_TC_ACT(BLK_TC_FS);
- __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
rw, what, rq->errors, 0, NULL);
}
}
@@ -857,7 +857,7 @@ void blk_add_driver_data(struct request_queue *q,
__blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
rq->errors, len, data);
else
- __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
0, BLK_TA_DRV_DATA, rq->errors, len, data);
}
EXPORT_SYMBOL_GPL(blk_add_driver_data);
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 05/11] block: convert to pos and nr_sectors accessors
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo, Jeff Garzik
With recent cleanups, there is no place where low level driver
directly manipulates request fields. This means that the 'hard'
request fields always equal the !hard fields. Convert all
rq->sectors, nr_sectors and current_nr_sectors references to
accessors.
[ Impact: use pos and nr_sectors accessors ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Tested-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Tim Waugh <tim@cyberelk.net>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Dario Ballabio <ballabio_dario@emc.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
---
arch/um/drivers/ubd_kern.c | 2 +-
block/as-iosched.c | 18 ++++++-----
block/blk-barrier.c | 2 +-
block/blk-core.c | 17 +++++------
block/blk-merge.c | 10 +++---
block/cfq-iosched.c | 18 ++++++------
block/deadline-iosched.c | 2 +-
block/elevator.c | 22 +++++++-------
drivers/block/DAC960.c | 6 ++--
drivers/block/amiflop.c | 6 ++--
drivers/block/ataflop.c | 10 +++---
drivers/block/cciss.c | 22 +++++++-------
drivers/block/cpqarray.c | 9 +++--
drivers/block/floppy.c | 53 ++++++++++++++++++-----------------
drivers/block/hd.c | 14 ++++----
drivers/block/nbd.c | 12 ++++----
drivers/block/paride/pcd.c | 4 +-
drivers/block/paride/pd.c | 8 ++--
drivers/block/paride/pf.c | 8 ++--
drivers/block/ps3disk.c | 9 ++---
drivers/block/sunvdc.c | 2 +-
drivers/block/swim3.c | 34 ++++++++++++----------
drivers/block/sx8.c | 6 ++--
drivers/block/ub.c | 6 ++--
drivers/block/viodasd.c | 2 +-
drivers/block/virtio_blk.c | 2 +-
drivers/block/xd.c | 4 +-
drivers/block/xen-blkfront.c | 11 +++----
drivers/block/xsysace.c | 17 ++++++-----
drivers/block/z2ram.c | 6 ++--
drivers/cdrom/gdrom.c | 6 ++--
drivers/cdrom/viocd.c | 2 +-
drivers/memstick/core/mspro_block.c | 6 ++--
drivers/message/i2o/i2o_block.c | 20 +++++++------
drivers/mmc/card/block.c | 10 +++---
drivers/mtd/mtd_blkdevs.c | 7 ++--
drivers/s390/block/dasd.c | 2 +-
drivers/s390/block/dasd_diag.c | 5 ++-
drivers/s390/block/dasd_eckd.c | 6 ++--
drivers/s390/block/dasd_fba.c | 7 ++--
drivers/s390/char/tape_34xx.c | 2 +-
drivers/s390/char/tape_3590.c | 2 +-
drivers/s390/char/tape_block.c | 2 +-
drivers/sbus/char/jsflash.c | 4 +-
drivers/scsi/eata.c | 24 ++++++++--------
drivers/scsi/lpfc/lpfc_scsi.c | 22 +++++++-------
drivers/scsi/scsi_lib.c | 6 ++--
drivers/scsi/sd.c | 24 ++++++++--------
drivers/scsi/sd_dif.c | 2 +-
drivers/scsi/sr.c | 15 +++++----
drivers/scsi/u14-34f.c | 22 ++++++++------
include/scsi/scsi_cmnd.h | 2 +-
52 files changed, 276 insertions(+), 264 deletions(-)
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 4330127..402ba8f 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1239,7 +1239,7 @@ static void do_ubd_request(struct request_queue *q)
}
req = dev->request;
- sector = req->sector;
+ sector = blk_rq_pos(req);
while(dev->start_sg < dev->end_sg){
struct scatterlist *sg = &dev->sg[dev->start_sg];
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 45bd070..7a12cf6 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -306,8 +306,8 @@ as_choose_req(struct as_data *ad, struct request *rq1, struct request *rq2)
data_dir = rq_is_sync(rq1);
last = ad->last_sector[data_dir];
- s1 = rq1->sector;
- s2 = rq2->sector;
+ s1 = blk_rq_pos(rq1);
+ s2 = blk_rq_pos(rq2);
BUG_ON(data_dir != rq_is_sync(rq2));
@@ -566,13 +566,15 @@ static void as_update_iohist(struct as_data *ad, struct as_io_context *aic,
as_update_thinktime(ad, aic, thinktime);
/* Calculate read -> read seek distance */
- if (aic->last_request_pos < rq->sector)
- seek_dist = rq->sector - aic->last_request_pos;
+ if (aic->last_request_pos < blk_rq_pos(rq))
+ seek_dist = blk_rq_pos(rq) -
+ aic->last_request_pos;
else
- seek_dist = aic->last_request_pos - rq->sector;
+ seek_dist = aic->last_request_pos -
+ blk_rq_pos(rq);
as_update_seekdist(ad, aic, seek_dist);
}
- aic->last_request_pos = rq->sector + rq->nr_sectors;
+ aic->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
set_bit(AS_TASK_IOSTARTED, &aic->state);
spin_unlock(&aic->lock);
}
@@ -587,7 +589,7 @@ static int as_close_req(struct as_data *ad, struct as_io_context *aic,
{
unsigned long delay; /* jiffies */
sector_t last = ad->last_sector[ad->batch_data_dir];
- sector_t next = rq->sector;
+ sector_t next = blk_rq_pos(rq);
sector_t delta; /* acceptable close offset (in sectors) */
sector_t s;
@@ -981,7 +983,7 @@ static void as_move_to_dispatch(struct as_data *ad, struct request *rq)
* This has to be set in order to be correctly updated by
* as_find_next_rq
*/
- ad->last_sector[data_dir] = rq->sector + rq->nr_sectors;
+ ad->last_sector[data_dir] = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (data_dir == BLK_RW_SYNC) {
struct io_context *ioc = RQ_IOC(rq);
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index c167de5..8713c2f 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -324,7 +324,7 @@ int blkdev_issue_flush(struct block_device *bdev, sector_t *error_sector)
/*
* The driver must store the error location in ->bi_sector, if
* it supports it. For non-stacked drivers, this should be copied
- * from rq->sector.
+ * from blk_rq_pos(rq).
*/
if (error_sector)
*error_sector = bio->bi_sector;
diff --git a/block/blk-core.c b/block/blk-core.c
index 895e55b..82dc206 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -72,7 +72,7 @@ static void drive_stat_acct(struct request *rq, int new_io)
return;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(rq->rq_disk, rq->sector);
+ part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
if (!new_io)
part_stat_inc(cpu, part, merges[rw]);
@@ -185,10 +185,9 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->cmd_type,
rq->cmd_flags);
- printk(KERN_INFO " sector %llu, nr/cnr %lu/%u\n",
- (unsigned long long)rq->sector,
- rq->nr_sectors,
- rq->current_nr_sectors);
+ printk(KERN_INFO " sector %llu, nr/cnr %u/%u\n",
+ (unsigned long long)blk_rq_pos(rq),
+ blk_rq_sectors(rq), blk_rq_cur_sectors(rq));
printk(KERN_INFO " bio %p, biotail %p, buffer %p, len %u\n",
rq->bio, rq->biotail,
rq->buffer, rq->data_len);
@@ -1557,7 +1556,7 @@ EXPORT_SYMBOL(submit_bio);
*/
int blk_rq_check_limits(struct request_queue *q, struct request *rq)
{
- if (rq->nr_sectors > q->max_sectors ||
+ if (blk_rq_sectors(rq) > q->max_sectors ||
rq->data_len > q->max_hw_sectors << 9) {
printk(KERN_ERR "%s: over max size limit.\n", __func__);
return -EIO;
@@ -1645,7 +1644,7 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes)
int cpu;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_stat_add(cpu, part, sectors[rw], bytes >> 9);
part_stat_unlock();
}
@@ -1665,7 +1664,7 @@ static void blk_account_io_done(struct request *req)
int cpu;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
@@ -1846,7 +1845,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
if (error && (blk_fs_request(req) && !(req->cmd_flags & REQ_QUIET))) {
printk(KERN_ERR "end_request: I/O error, dev %s, sector %llu\n",
req->rq_disk ? req->rq_disk->disk_name : "?",
- (unsigned long long)req->sector);
+ (unsigned long long)blk_rq_pos(req));
}
blk_account_io_completion(req, nr_bytes);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 23d2a6f..bf62a87 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -259,7 +259,7 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
else
max_sectors = q->max_sectors;
- if (req->nr_sectors + bio_sectors(bio) > max_sectors) {
+ if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@@ -284,7 +284,7 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
max_sectors = q->max_sectors;
- if (req->nr_sectors + bio_sectors(bio) > max_sectors) {
+ if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@@ -315,7 +315,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
/*
* Will it become too large?
*/
- if ((req->nr_sectors + next->nr_sectors) > q->max_sectors)
+ if ((blk_rq_sectors(req) + blk_rq_sectors(next)) > q->max_sectors)
return 0;
total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;
@@ -345,7 +345,7 @@ static void blk_account_io_merge(struct request *req)
int cpu;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_round_stats(cpu, part);
part_dec_in_flight(part);
@@ -366,7 +366,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
/*
* not contiguous
*/
- if (req->sector + req->nr_sectors != next->sector)
+ if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
return 0;
if (rq_data_dir(req) != rq_data_dir(next)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 575083a..db4d990 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -349,8 +349,8 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2)
else if (rq_is_meta(rq2) && !rq_is_meta(rq1))
return rq2;
- s1 = rq1->sector;
- s2 = rq2->sector;
+ s1 = blk_rq_pos(rq1);
+ s2 = blk_rq_pos(rq2);
last = cfqd->last_position;
@@ -949,10 +949,10 @@ static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd,
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd,
struct request *rq)
{
- if (rq->sector >= cfqd->last_position)
- return rq->sector - cfqd->last_position;
+ if (blk_rq_pos(rq) >= cfqd->last_position)
+ return blk_rq_pos(rq) - cfqd->last_position;
else
- return cfqd->last_position - rq->sector;
+ return cfqd->last_position - blk_rq_pos(rq);
}
#define CIC_SEEK_THR 8 * 1024
@@ -1918,10 +1918,10 @@ cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_io_context *cic,
if (!cic->last_request_pos)
sdist = 0;
- else if (cic->last_request_pos < rq->sector)
- sdist = rq->sector - cic->last_request_pos;
+ else if (cic->last_request_pos < blk_rq_pos(rq))
+ sdist = blk_rq_pos(rq) - cic->last_request_pos;
else
- sdist = cic->last_request_pos - rq->sector;
+ sdist = cic->last_request_pos - blk_rq_pos(rq);
/*
* Don't allow the seek distance to get too large from the
@@ -2071,7 +2071,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfq_update_io_seektime(cfqd, cic, rq);
cfq_update_idle_window(cfqd, cfqq, cic);
- cic->last_request_pos = rq->sector + rq->nr_sectors;
+ cic->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (cfqq == cfqd->active_queue) {
/*
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index c4d991d..b547cbc 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -138,7 +138,7 @@ deadline_merge(struct request_queue *q, struct request **req, struct bio *bio)
__rq = elv_rb_find(&dd->sort_list[bio_data_dir(bio)], sector);
if (__rq) {
- BUG_ON(sector != __rq->sector);
+ BUG_ON(sector != blk_rq_pos(__rq));
if (elv_rq_merge_ok(__rq, bio)) {
ret = ELEVATOR_FRONT_MERGE;
diff --git a/block/elevator.c b/block/elevator.c
index 1af5d9f..9189200 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -52,7 +52,7 @@ static const int elv_hash_shift = 6;
#define ELV_HASH_FN(sec) \
(hash_long(ELV_HASH_BLOCK((sec)), elv_hash_shift))
#define ELV_HASH_ENTRIES (1 << elv_hash_shift)
-#define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors)
+#define rq_hash_key(rq) (blk_rq_pos(rq) + blk_rq_sectors(rq))
DEFINE_TRACE(block_rq_insert);
DEFINE_TRACE(block_rq_issue);
@@ -119,9 +119,9 @@ static inline int elv_try_merge(struct request *__rq, struct bio *bio)
* we can merge and sequence is ok, check if it's possible
*/
if (elv_rq_merge_ok(__rq, bio)) {
- if (__rq->sector + __rq->nr_sectors == bio->bi_sector)
+ if (blk_rq_pos(__rq) + blk_rq_sectors(__rq) == bio->bi_sector)
ret = ELEVATOR_BACK_MERGE;
- else if (__rq->sector - bio_sectors(bio) == bio->bi_sector)
+ else if (blk_rq_pos(__rq) - bio_sectors(bio) == bio->bi_sector)
ret = ELEVATOR_FRONT_MERGE;
}
@@ -370,9 +370,9 @@ struct request *elv_rb_add(struct rb_root *root, struct request *rq)
parent = *p;
__rq = rb_entry(parent, struct request, rb_node);
- if (rq->sector < __rq->sector)
+ if (blk_rq_pos(rq) < blk_rq_pos(__rq))
p = &(*p)->rb_left;
- else if (rq->sector > __rq->sector)
+ else if (blk_rq_pos(rq) > blk_rq_pos(__rq))
p = &(*p)->rb_right;
else
return __rq;
@@ -400,9 +400,9 @@ struct request *elv_rb_find(struct rb_root *root, sector_t sector)
while (n) {
rq = rb_entry(n, struct request, rb_node);
- if (sector < rq->sector)
+ if (sector < blk_rq_pos(rq))
n = n->rb_left;
- else if (sector > rq->sector)
+ else if (sector > blk_rq_pos(rq))
n = n->rb_right;
else
return rq;
@@ -441,14 +441,14 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
break;
if (pos->cmd_flags & stop_flags)
break;
- if (rq->sector >= boundary) {
- if (pos->sector < boundary)
+ if (blk_rq_pos(rq) >= boundary) {
+ if (blk_rq_pos(pos) < boundary)
continue;
} else {
- if (pos->sector >= boundary)
+ if (blk_rq_pos(pos) >= boundary)
break;
}
- if (rq->sector >= pos->sector)
+ if (blk_rq_pos(rq) >= blk_rq_pos(pos))
break;
}
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index f22ed6c..774ab05 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -3338,8 +3338,8 @@ static int DAC960_process_queue(DAC960_Controller_T *Controller, struct request_
}
Command->Completion = Request->end_io_data;
Command->LogicalDriveNumber = (long)Request->rq_disk->private_data;
- Command->BlockNumber = Request->sector;
- Command->BlockCount = Request->nr_sectors;
+ Command->BlockNumber = blk_rq_pos(Request);
+ Command->BlockCount = blk_rq_sectors(Request);
Command->Request = Request;
blkdev_dequeue_request(Request);
Command->SegmentCount = blk_rq_map_sg(req_q,
@@ -3431,7 +3431,7 @@ static void DAC960_queue_partial_rw(DAC960_Command_T *Command)
* successfully as possible.
*/
Command->SegmentCount = 1;
- Command->BlockNumber = Request->sector;
+ Command->BlockNumber = blk_rq_pos(Request);
Command->BlockCount = 1;
DAC960_QueueReadWriteCommand(Command);
return;
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 8ff95f2..e4a14b9 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -1351,13 +1351,13 @@ static void redo_fd_request(void)
drive = floppy - unit;
/* Here someone could investigate to be more efficient */
- for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
+ for (cnt = 0; cnt < blk_rq_cur_sectors(CURRENT); cnt++) {
#ifdef DEBUG
printk("fd: sector %ld + %d requested for %s\n",
- CURRENT->sector,cnt,
+ blk_rq_pos(CURRENT), cnt,
(rq_data_dir(CURRENT) == READ) ? "read" : "write");
#endif
- block = CURRENT->sector + cnt;
+ block = blk_rq_pos(CURRENT) + cnt;
if ((int)block > floppy->blocks) {
__blk_end_request_cur(CURRENT, -EIO);
goto repeat;
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 2506728..234024c 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -725,7 +725,7 @@ static void do_fd_action( int drive )
if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
if (ReqCmd == READ) {
copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
- if (++ReqCnt < CURRENT->current_nr_sectors) {
+ if (++ReqCnt < blk_rq_cur_sectors(CURRENT)) {
/* read next sector */
setup_req_params( drive );
goto repeat;
@@ -1130,7 +1130,7 @@ static void fd_rwsec_done1(int status)
}
}
- if (++ReqCnt < CURRENT->current_nr_sectors) {
+ if (++ReqCnt < blk_rq_cur_sectors(CURRENT)) {
/* read next sector */
setup_req_params( SelectedDrive );
do_fd_action( SelectedDrive );
@@ -1394,7 +1394,7 @@ static void redo_fd_request(void)
DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n",
CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "",
- CURRENT ? CURRENT->sector : 0 ));
+ CURRENT ? blk_rq_pos(CURRENT) : 0 ));
IsFormatting = 0;
@@ -1440,7 +1440,7 @@ repeat:
UD.autoprobe = 0;
}
- if (CURRENT->sector + 1 > UDT->blocks) {
+ if (blk_rq_pos(CURRENT) + 1 > UDT->blocks) {
__blk_end_request_cur(CURRENT, -EIO);
goto repeat;
}
@@ -1450,7 +1450,7 @@ repeat:
ReqCnt = 0;
ReqCmd = rq_data_dir(CURRENT);
- ReqBlock = CURRENT->sector;
+ ReqBlock = blk_rq_pos(CURRENT);
ReqBuffer = CURRENT->buffer;
setup_req_params( drive );
do_fd_action( drive );
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index f22d493..ab7b04c 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2835,10 +2835,10 @@ static void do_cciss_request(struct request_queue *q)
c->Request.Timeout = 0; // Don't time out
c->Request.CDB[0] =
(rq_data_dir(creq) == READ) ? h->cciss_read : h->cciss_write;
- start_blk = creq->sector;
+ start_blk = blk_rq_pos(creq);
#ifdef CCISS_DEBUG
- printk(KERN_DEBUG "ciss: sector =%d nr_sectors=%d\n", (int)creq->sector,
- (int)creq->nr_sectors);
+ printk(KERN_DEBUG "ciss: sector =%d nr_sectors=%d\n",
+ (int)blk_rq_pos(creq), (int)blk_rq_sectors(creq));
#endif /* CCISS_DEBUG */
sg_init_table(tmp_sg, MAXSGENTRIES);
@@ -2864,8 +2864,8 @@ static void do_cciss_request(struct request_queue *q)
h->maxSG = seg;
#ifdef CCISS_DEBUG
- printk(KERN_DEBUG "cciss: Submitting %lu sectors in %d segments\n",
- creq->nr_sectors, seg);
+ printk(KERN_DEBUG "cciss: Submitting %u sectors in %d segments\n",
+ blk_rq_sectors(creq), seg);
#endif /* CCISS_DEBUG */
c->Header.SGList = c->Header.SGTotal = seg;
@@ -2877,8 +2877,8 @@ static void do_cciss_request(struct request_queue *q)
c->Request.CDB[4] = (start_blk >> 8) & 0xff;
c->Request.CDB[5] = start_blk & 0xff;
c->Request.CDB[6] = 0; // (sect >> 24) & 0xff; MSB
- c->Request.CDB[7] = (creq->nr_sectors >> 8) & 0xff;
- c->Request.CDB[8] = creq->nr_sectors & 0xff;
+ c->Request.CDB[7] = (blk_rq_sectors(creq) >> 8) & 0xff;
+ c->Request.CDB[8] = blk_rq_sectors(creq) & 0xff;
c->Request.CDB[9] = c->Request.CDB[11] = c->Request.CDB[12] = 0;
} else {
u32 upper32 = upper_32_bits(start_blk);
@@ -2893,10 +2893,10 @@ static void do_cciss_request(struct request_queue *q)
c->Request.CDB[7]= (start_blk >> 16) & 0xff;
c->Request.CDB[8]= (start_blk >> 8) & 0xff;
c->Request.CDB[9]= start_blk & 0xff;
- c->Request.CDB[10]= (creq->nr_sectors >> 24) & 0xff;
- c->Request.CDB[11]= (creq->nr_sectors >> 16) & 0xff;
- c->Request.CDB[12]= (creq->nr_sectors >> 8) & 0xff;
- c->Request.CDB[13]= creq->nr_sectors & 0xff;
+ c->Request.CDB[10]= (blk_rq_sectors(creq) >> 24) & 0xff;
+ c->Request.CDB[11]= (blk_rq_sectors(creq) >> 16) & 0xff;
+ c->Request.CDB[12]= (blk_rq_sectors(creq) >> 8) & 0xff;
+ c->Request.CDB[13]= blk_rq_sectors(creq) & 0xff;
c->Request.CDB[14] = c->Request.CDB[15] = 0;
}
} else if (blk_pc_request(creq)) {
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 488a8f4..a5caeff 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -919,10 +919,11 @@ queue_next:
c->hdr.size = sizeof(rblk_t) >> 2;
c->size += sizeof(rblk_t);
- c->req.hdr.blk = creq->sector;
+ c->req.hdr.blk = blk_rq_pos(creq);
c->rq = creq;
DBGPX(
- printk("sector=%d, nr_sectors=%d\n", creq->sector, creq->nr_sectors);
+ printk("sector=%d, nr_sectors=%u\n",
+ blk_rq_pos(creq), blk_rq_sectors(creq));
);
sg_init_table(tmp_sg, SG_MAX);
seg = blk_rq_map_sg(q, creq, tmp_sg);
@@ -940,9 +941,9 @@ DBGPX(
tmp_sg[i].offset,
tmp_sg[i].length, dir);
}
-DBGPX( printk("Submitting %d sectors in %d segments\n", creq->nr_sectors, seg); );
+DBGPX( printk("Submitting %u sectors in %d segments\n", blk_rq_sectors(creq), seg); );
c->req.hdr.sg_cnt = seg;
- c->req.hdr.blk_cnt = creq->nr_sectors;
+ c->req.hdr.blk_cnt = blk_rq_sectors(creq);
c->req.hdr.cmd = (rq_data_dir(creq) == READ) ? IDA_READ : IDA_WRITE;
c->type = CMD_RWREQ;
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 1300df6..4524862 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2303,7 +2303,7 @@ static void floppy_end_request(struct request *req, int error)
/* current_count_sectors can be zero if transfer failed */
if (error)
- nr_sectors = req->current_nr_sectors;
+ nr_sectors = blk_rq_cur_sectors(req);
if (__blk_end_request(req, error, nr_sectors << 9))
return;
@@ -2332,7 +2332,7 @@ static void request_done(int uptodate)
if (uptodate) {
/* maintain values for invalidation on geometry
* change */
- block = current_count_sectors + req->sector;
+ block = current_count_sectors + blk_rq_pos(req);
INFBOUND(DRS->maxblock, block);
if (block > _floppy->sect)
DRS->maxtrack = 1;
@@ -2346,10 +2346,10 @@ static void request_done(int uptodate)
/* record write error information */
DRWE->write_errors++;
if (DRWE->write_errors == 1) {
- DRWE->first_error_sector = req->sector;
+ DRWE->first_error_sector = blk_rq_pos(req);
DRWE->first_error_generation = DRS->generation;
}
- DRWE->last_error_sector = req->sector;
+ DRWE->last_error_sector = blk_rq_pos(req);
DRWE->last_error_generation = DRS->generation;
}
spin_lock_irqsave(q->queue_lock, flags);
@@ -2503,24 +2503,24 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
max_sector = transfer_size(ssize,
min(max_sector, max_sector_2),
- current_req->nr_sectors);
+ blk_rq_sectors(current_req));
if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
- buffer_max > fsector_t + current_req->nr_sectors)
+ buffer_max > fsector_t + blk_rq_sectors(current_req))
current_count_sectors = min_t(int, buffer_max - fsector_t,
- current_req->nr_sectors);
+ blk_rq_sectors(current_req));
remaining = current_count_sectors << 9;
#ifdef FLOPPY_SANITY_CHECK
- if ((remaining >> 9) > current_req->nr_sectors &&
+ if ((remaining >> 9) > blk_rq_sectors(current_req) &&
CT(COMMAND) == FD_WRITE) {
DPRINT("in copy buffer\n");
printk("current_count_sectors=%ld\n", current_count_sectors);
printk("remaining=%d\n", remaining >> 9);
- printk("current_req->nr_sectors=%ld\n",
- current_req->nr_sectors);
+ printk("current_req->nr_sectors=%u\n",
+ blk_rq_sectors(current_req));
printk("current_req->current_nr_sectors=%u\n",
- current_req->current_nr_sectors);
+ blk_rq_cur_sectors(current_req));
printk("max_sector=%d\n", max_sector);
printk("ssize=%d\n", ssize);
}
@@ -2530,7 +2530,7 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
- size = current_req->current_nr_sectors << 9;
+ size = blk_rq_cur_sectors(current_req) << 9;
rq_for_each_segment(bv, current_req, iter) {
if (!remaining)
@@ -2648,10 +2648,10 @@ static int make_raw_rw_request(void)
max_sector = _floppy->sect * _floppy->head;
- TRACK = (int)current_req->sector / max_sector;
- fsector_t = (int)current_req->sector % max_sector;
+ TRACK = (int)blk_rq_pos(current_req) / max_sector;
+ fsector_t = (int)blk_rq_pos(current_req) % max_sector;
if (_floppy->track && TRACK >= _floppy->track) {
- if (current_req->current_nr_sectors & 1) {
+ if (blk_rq_cur_sectors(current_req) & 1) {
current_count_sectors = 1;
return 1;
} else
@@ -2669,7 +2669,7 @@ static int make_raw_rw_request(void)
if (fsector_t >= max_sector) {
current_count_sectors =
min_t(int, _floppy->sect - fsector_t,
- current_req->nr_sectors);
+ blk_rq_sectors(current_req));
return 1;
}
SIZECODE = 2;
@@ -2720,7 +2720,7 @@ static int make_raw_rw_request(void)
in_sector_offset = (fsector_t % _floppy->sect) % ssize;
aligned_sector_t = fsector_t - in_sector_offset;
- max_size = current_req->nr_sectors;
+ max_size = blk_rq_sectors(current_req);
if ((raw_cmd->track == buffer_track) &&
(current_drive == buffer_drive) &&
(fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
@@ -2729,10 +2729,10 @@ static int make_raw_rw_request(void)
copy_buffer(1, max_sector, buffer_max);
return 1;
}
- } else if (in_sector_offset || current_req->nr_sectors < ssize) {
+ } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
if (CT(COMMAND) == FD_WRITE) {
- if (fsector_t + current_req->nr_sectors > ssize &&
- fsector_t + current_req->nr_sectors < ssize + ssize)
+ if (fsector_t + blk_rq_sectors(current_req) > ssize &&
+ fsector_t + blk_rq_sectors(current_req) < ssize + ssize)
max_size = ssize + ssize;
else
max_size = ssize;
@@ -2776,7 +2776,7 @@ static int make_raw_rw_request(void)
(indirect * 2 > direct * 3 &&
*errors < DP->max_errors.read_track && ((!probing
|| (DP->read_track & (1 << DRS->probed_format)))))) {
- max_size = current_req->nr_sectors;
+ max_size = blk_rq_sectors(current_req);
} else {
raw_cmd->kernel_data = current_req->buffer;
raw_cmd->length = current_count_sectors << 9;
@@ -2801,7 +2801,7 @@ static int make_raw_rw_request(void)
fsector_t > buffer_max ||
fsector_t < buffer_min ||
((CT(COMMAND) == FD_READ ||
- (!in_sector_offset && current_req->nr_sectors >= ssize)) &&
+ (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
max_sector > 2 * max_buffer_sectors + buffer_min &&
max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
/* not enough space */
@@ -2879,8 +2879,8 @@ static int make_raw_rw_request(void)
printk("write\n");
return 0;
}
- } else if (raw_cmd->length > current_req->nr_sectors << 9 ||
- current_count_sectors > current_req->nr_sectors) {
+ } else if (raw_cmd->length > blk_rq_sectors(current_req) << 9 ||
+ current_count_sectors > blk_rq_sectors(current_req)) {
DPRINT("buffer overrun in direct transfer\n");
return 0;
} else if (raw_cmd->length < current_count_sectors << 9) {
@@ -2990,8 +2990,9 @@ static void do_fd_request(struct request_queue * q)
if (usage_count == 0) {
printk("warning: usage count=0, current_req=%p exiting\n",
current_req);
- printk("sect=%ld type=%x flags=%x\n", (long)current_req->sector,
- current_req->cmd_type, current_req->cmd_flags);
+ printk("sect=%ld type=%x flags=%x\n",
+ (long)blk_rq_pos(current_req), current_req->cmd_type,
+ current_req->cmd_flags);
return;
}
if (test_bit(0, &fdc_busy)) {
diff --git a/drivers/block/hd.c b/drivers/block/hd.c
index 75b9ca9..a3b3994 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -228,7 +228,7 @@ static void dump_status(const char *msg, unsigned int stat)
printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL),
inb(HD_CURRENT) & 0xf, inb(HD_SECTOR));
if (CURRENT)
- printk(", sector=%ld", CURRENT->sector);
+ printk(", sector=%ld", blk_rq_pos(CURRENT));
}
printk("\n");
}
@@ -457,9 +457,9 @@ ok_to_read:
req = CURRENT;
insw(HD_DATA, req->buffer, 256);
#ifdef DEBUG
- printk("%s: read: sector %ld, remaining = %ld, buffer=%p\n",
- req->rq_disk->disk_name, req->sector + 1, req->nr_sectors - 1,
- req->buffer+512);
+ printk("%s: read: sector %ld, remaining = %u, buffer=%p\n",
+ req->rq_disk->disk_name, blk_rq_pos(req) + 1,
+ blk_rq_sectors(req) - 1, req->buffer+512);
#endif
if (__blk_end_request(req, 0, 512)) {
SET_HANDLER(&read_intr);
@@ -485,7 +485,7 @@ static void write_intr(void)
continue;
if (!OK_STATUS(i))
break;
- if ((req->nr_sectors <= 1) || (i & DRQ_STAT))
+ if ((blk_rq_sectors(req) <= 1) || (i & DRQ_STAT))
goto ok_to_write;
} while (--retries > 0);
dump_status("write_intr", i);
@@ -589,8 +589,8 @@ repeat:
return;
}
disk = req->rq_disk->private_data;
- block = req->sector;
- nsect = req->nr_sectors;
+ block = blk_rq_pos(req);
+ nsect = blk_rq_sectors(req);
if (block >= get_capacity(req->rq_disk) ||
((block+nsect) > get_capacity(req->rq_disk))) {
printk("%s: bad access: block=%d, count=%d\n",
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index a9ab8be..977a573 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -110,7 +110,7 @@ static void nbd_end_request(struct request *req)
req, error ? "failed" : "done");
spin_lock_irqsave(q->queue_lock, flags);
- __blk_end_request(req, error, req->nr_sectors << 9);
+ __blk_end_request(req, error, blk_rq_sectors(req) << 9);
spin_unlock_irqrestore(q->queue_lock, flags);
}
@@ -231,19 +231,19 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
{
int result, flags;
struct nbd_request request;
- unsigned long size = req->nr_sectors << 9;
+ unsigned long size = blk_rq_sectors(req) << 9;
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(nbd_cmd(req));
- request.from = cpu_to_be64((u64) req->sector << 9);
+ request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
request.len = htonl(size);
memcpy(request.handle, &req, sizeof(req));
- dprintk(DBG_TX, "%s: request %p: sending control (%s@%llu,%luB)\n",
+ dprintk(DBG_TX, "%s: request %p: sending control (%s@%llu,%uB)\n",
lo->disk->disk_name, req,
nbdcmd_to_ascii(nbd_cmd(req)),
- (unsigned long long)req->sector << 9,
- req->nr_sectors << 9);
+ (unsigned long long)blk_rq_pos(req) << 9,
+ blk_rq_sectors(req) << 9);
result = sock_xmit(lo, 1, &request, sizeof(request),
(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
if (result <= 0) {
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 9fd57c2..2d5dc0a 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -728,8 +728,8 @@ static void do_pcd_request(struct request_queue * q)
if (cd != pcd_current)
pcd_bufblk = -1;
pcd_current = cd;
- pcd_sector = pcd_req->sector;
- pcd_count = pcd_req->current_nr_sectors;
+ pcd_sector = blk_rq_pos(pcd_req);
+ pcd_count = blk_rq_cur_sectors(pcd_req);
pcd_buf = pcd_req->buffer;
pcd_busy = 1;
ps_set_intr(do_pcd_read, NULL, 0, nice);
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 0732df4..9ec5d4a 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -444,11 +444,11 @@ static enum action do_pd_io_start(void)
pd_cmd = rq_data_dir(pd_req);
if (pd_cmd == READ || pd_cmd == WRITE) {
- pd_block = pd_req->sector;
- pd_count = pd_req->current_nr_sectors;
+ pd_block = blk_rq_pos(pd_req);
+ pd_count = blk_rq_cur_sectors(pd_req);
if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
return Fail;
- pd_run = pd_req->nr_sectors;
+ pd_run = blk_rq_sectors(pd_req);
pd_buf = pd_req->buffer;
pd_retries = 0;
if (pd_cmd == READ)
@@ -479,7 +479,7 @@ static int pd_next_buf(void)
return 0;
spin_lock_irqsave(&pd_lock, saved_flags);
__blk_end_request_cur(pd_req, 0);
- pd_count = pd_req->current_nr_sectors;
+ pd_count = blk_rq_cur_sectors(pd_req);
pd_buf = pd_req->buffer;
spin_unlock_irqrestore(&pd_lock, saved_flags);
return 0;
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index 3871e35..e88c889 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -768,9 +768,9 @@ repeat:
return;
pf_current = pf_req->rq_disk->private_data;
- pf_block = pf_req->sector;
- pf_run = pf_req->nr_sectors;
- pf_count = pf_req->current_nr_sectors;
+ pf_block = blk_rq_pos(pf_req);
+ pf_run = blk_rq_sectors(pf_req);
+ pf_count = blk_rq_cur_sectors(pf_req);
if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) {
pf_end_request(-EIO);
@@ -810,7 +810,7 @@ static int pf_next_buf(void)
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
if (!pf_req)
return 1;
- pf_count = pf_req->current_nr_sectors;
+ pf_count = blk_rq_cur_sectors(pf_req);
pf_buf = pf_req->buffer;
}
return 0;
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index c238867..8d58308 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -134,13 +134,12 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
rq_for_each_segment(bv, req, iter)
n++;
dev_dbg(&dev->sbd.core,
- "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
- __func__, __LINE__, op, n, req->nr_sectors,
- blk_rq_sectors(req));
+ "%s:%u: %s req has %u bvecs for %u sectors\n",
+ __func__, __LINE__, op, n, blk_rq_sectors(req));
#endif
- start_sector = req->sector * priv->blocking_factor;
- sectors = req->nr_sectors * priv->blocking_factor;
+ start_sector = blk_rq_pos(req) * priv->blocking_factor;
+ sectors = blk_rq_sectors(req) * priv->blocking_factor;
dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
__func__, __LINE__, op, sectors, start_sector);
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index f59887c..9f351bf 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -416,7 +416,7 @@ static int __send_request(struct request *req)
desc->slice = 0;
}
desc->status = ~0;
- desc->offset = (req->sector << 9) / port->vdisk_block_size;
+ desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
desc->size = len;
desc->ncookies = err;
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 4248559..c1b9a4d 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -312,14 +312,14 @@ static void start_request(struct floppy_state *fs)
}
while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
#if 0
- printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
+ printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
req->rq_disk->disk_name, req->cmd,
- (long)req->sector, req->nr_sectors, req->buffer);
- printk(" errors=%d current_nr_sectors=%ld\n",
- req->errors, req->current_nr_sectors);
+ (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
+ printk(" errors=%d current_nr_sectors=%u\n",
+ req->errors, blk_rq_cur_sectors(req));
#endif
- if (req->sector >= fs->total_secs) {
+ if (blk_rq_pos(req) >= fs->total_secs) {
__blk_end_request_cur(req, -EIO);
continue;
}
@@ -337,13 +337,14 @@ static void start_request(struct floppy_state *fs)
}
}
- /* Do not remove the cast. req->sector is now a sector_t and
- * can be 64 bits, but it will never go past 32 bits for this
- * driver anyway, so we can safely cast it down and not have
- * to do a 64/32 division
+ /* Do not remove the cast. blk_rq_pos(req) is now a
+ * sector_t and can be 64 bits, but it will never go
+ * past 32 bits for this driver anyway, so we can
+ * safely cast it down and not have to do a 64/32
+ * division
*/
- fs->req_cyl = ((long)req->sector) / fs->secpercyl;
- x = ((long)req->sector) % fs->secpercyl;
+ fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
+ x = ((long)blk_rq_pos(req)) % fs->secpercyl;
fs->head = x / fs->secpertrack;
fs->req_sector = x % fs->secpertrack + 1;
fd_req = req;
@@ -420,7 +421,7 @@ static inline void setup_transfer(struct floppy_state *fs)
struct dbdma_cmd *cp = fs->dma_cmd;
struct dbdma_regs __iomem *dr = fs->dma;
- if (fd_req->current_nr_sectors <= 0) {
+ if (blk_rq_cur_sectors(fd_req) <= 0) {
printk(KERN_ERR "swim3: transfer 0 sectors?\n");
return;
}
@@ -428,8 +429,8 @@ static inline void setup_transfer(struct floppy_state *fs)
n = 1;
else {
n = fs->secpertrack - fs->req_sector + 1;
- if (n > fd_req->current_nr_sectors)
- n = fd_req->current_nr_sectors;
+ if (n > blk_rq_cur_sectors(fd_req))
+ n = blk_rq_cur_sectors(fd_req);
}
fs->scount = n;
swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
@@ -600,7 +601,8 @@ static void xfer_timeout(unsigned long data)
out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
out_8(&sw->select, RELAX);
printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
- (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
+ (rq_data_dir(fd_req)==WRITE? "writ": "read"),
+ (long)blk_rq_pos(fd_req));
__blk_end_request_cur(fd_req, -EIO);
fs->state = idle;
start_request(fs);
@@ -714,7 +716,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
} else {
printk("swim3: error %sing block %ld (err=%x)\n",
rq_data_dir(fd_req) == WRITE? "writ": "read",
- (long)fd_req->sector, err);
+ (long)blk_rq_pos(fd_req), err);
__blk_end_request_cur(fd_req, -EIO);
fs->state = idle;
}
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 60e85bb..087c94c 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -903,10 +903,10 @@ queue_one_request:
msg->sg_count = n_elem;
msg->sg_type = SGT_32BIT;
msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
- msg->lba = cpu_to_le32(rq->sector & 0xffffffff);
- tmp = (rq->sector >> 16) >> 16;
+ msg->lba = cpu_to_le32(blk_rq_pos(rq) & 0xffffffff);
+ tmp = (blk_rq_pos(rq) >> 16) >> 16;
msg->lba_high = cpu_to_le16( (u16) tmp );
- msg->lba_count = cpu_to_le16(rq->nr_sectors);
+ msg->lba_count = cpu_to_le16(blk_rq_sectors(rq));
msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
for (i = 0; i < n_elem; i++) {
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 8c2cc71..dc3b899 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -726,8 +726,8 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
* The call to blk_queue_hardsect_size() guarantees that request
* is aligned, but it is given in terms of 512 byte units, always.
*/
- block = rq->sector >> lun->capacity.bshift;
- nblks = rq->nr_sectors >> lun->capacity.bshift;
+ block = blk_rq_pos(rq) >> lun->capacity.bshift;
+ nblks = blk_rq_sectors(rq) >> lun->capacity.bshift;
cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10;
/* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
@@ -739,7 +739,7 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
cmd->cdb[8] = nblks;
cmd->cdb_len = 10;
- cmd->len = rq->nr_sectors * 512;
+ cmd->len = blk_rq_sectors(rq) * 512;
}
static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index e821eed..2086cb1 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -252,7 +252,7 @@ static int send_request(struct request *req)
struct viodasd_device *d;
unsigned long flags;
- start = (u64)req->sector << 9;
+ start = (u64)blk_rq_pos(req) << 9;
if (rq_data_dir(req) == READ) {
direction = DMA_FROM_DEVICE;
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 50745e6..1980ab4 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -85,7 +85,7 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
vbr->req = req;
if (blk_fs_request(vbr->req)) {
vbr->out_hdr.type = 0;
- vbr->out_hdr.sector = vbr->req->sector;
+ vbr->out_hdr.sector = blk_rq_pos(vbr->req);
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
} else if (blk_pc_request(vbr->req)) {
vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index 14be4c1..4ef8801 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -306,8 +306,8 @@ static void do_xd_request (struct request_queue * q)
return;
while ((req = elv_next_request(q)) != NULL) {
- unsigned block = req->sector;
- unsigned count = req->nr_sectors;
+ unsigned block = blk_rq_pos(req);
+ unsigned count = blk_rq_sectors(req);
XD_INFO *disk = req->rq_disk->private_data;
int res = 0;
int retry;
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index b456447..91fc565 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -231,7 +231,7 @@ static int blkif_queue_request(struct request *req)
info->shadow[id].request = (unsigned long)req;
ring_req->id = id;
- ring_req->sector_number = (blkif_sector_t)req->sector;
+ ring_req->sector_number = (blkif_sector_t)blk_rq_pos(req);
ring_req->handle = info->handle;
ring_req->operation = rq_data_dir(req) ?
@@ -310,11 +310,10 @@ static void do_blkif_request(struct request_queue *rq)
goto wait;
pr_debug("do_blk_req %p: cmd %p, sec %lx, "
- "(%u/%li) buffer:%p [%s]\n",
- req, req->cmd, (unsigned long)req->sector,
- req->current_nr_sectors,
- req->nr_sectors, req->buffer,
- rq_data_dir(req) ? "write" : "read");
+ "(%u/%u) buffer:%p [%s]\n",
+ req, req->cmd, (unsigned long)blk_rq_pos(req),
+ blk_rq_cur_sectors(req), blk_rq_sectors(req),
+ req->buffer, rq_data_dir(req) ? "write" : "read");
blkdev_dequeue_request(req);
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index 5722931..97c99b4 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -646,13 +646,14 @@ static void ace_fsm_dostate(struct ace_device *ace)
/* Okay, it's a data request, set it up for transfer */
dev_dbg(ace->dev,
"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
- (unsigned long long) req->sector, blk_rq_sectors(req),
- req->current_nr_sectors, rq_data_dir(req));
+ (unsigned long long)blk_rq_pos(req),
+ blk_rq_sectors(req), blk_rq_cur_sectors(req),
+ rq_data_dir(req));
ace->req = req;
ace->data_ptr = req->buffer;
- ace->data_count = req->current_nr_sectors * ACE_BUF_PER_SECTOR;
- ace_out32(ace, ACE_MPULBA, req->sector & 0x0FFFFFFF);
+ ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
+ ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
count = blk_rq_sectors(req);
if (rq_data_dir(req)) {
@@ -688,7 +689,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
dev_dbg(ace->dev,
"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
- ace->req->current_nr_sectors * 16,
+ blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yield(ace); /* need to poll CFBSY bit */
break;
@@ -697,7 +698,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
dev_dbg(ace->dev,
"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
- ace->req->current_nr_sectors * 16,
+ blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yieldirq(ace);
break;
@@ -721,10 +722,10 @@ static void ace_fsm_dostate(struct ace_device *ace)
blk_rq_cur_bytes(ace->req))) {
/* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
* blk_rq_sectors(ace->req),
- * ace->req->current_nr_sectors);
+ * blk_rq_cur_sectors(ace->req));
*/
ace->data_ptr = ace->req->buffer;
- ace->data_count = ace->req->current_nr_sectors * 16;
+ ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
ace_fsm_yieldirq(ace);
break;
}
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index b66ad58..d4e6b71 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -71,12 +71,12 @@ static void do_z2_request(struct request_queue *q)
{
struct request *req;
while ((req = elv_next_request(q)) != NULL) {
- unsigned long start = req->sector << 9;
- unsigned long len = req->current_nr_sectors << 9;
+ unsigned long start = blk_rq_pos(req) << 9;
+ unsigned long len = blk_rq_cur_sectors(req) << 9;
if (start + len > z2ram_size) {
printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
- req->sector, req->current_nr_sectors);
+ blk_rq_pos(req), blk_rq_cur_sectors(req));
__blk_end_request_cur(req, -EIO);
continue;
}
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index cab2b1f..488423c 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -584,8 +584,8 @@ static void gdrom_readdisk_dma(struct work_struct *work)
list_for_each_safe(elem, next, &gdrom_deferred) {
req = list_entry(elem, struct request, queuelist);
spin_unlock(&gdrom_lock);
- block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
- block_cnt = req->nr_sectors/GD_TO_BLK;
+ block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
@@ -661,7 +661,7 @@ static void gdrom_request(struct request_queue *rq)
printk(" write request ignored\n");
__blk_end_request_cur(req, -EIO);
}
- if (req->nr_sectors)
+ if (blk_rq_sectors(req))
gdrom_request_handler_dma(req);
else
__blk_end_request_cur(req, -EIO);
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index cc3efa0..6e190a9 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -282,7 +282,7 @@ static int send_request(struct request *req)
viopath_targetinst(viopath_hostLp),
(u64)req, VIOVERSION << 16,
((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
- (u64)req->sector * 512, len, 0);
+ (u64)blk_rq_pos(req) * 512, len, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
return -1;
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index a416346..9e600d2 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -677,10 +677,10 @@ try_again:
continue;
}
- t_sec = msb->block_req->sector << 9;
+ t_sec = blk_rq_pos(msb->block_req) << 9;
sector_div(t_sec, msb->page_size);
- count = msb->block_req->nr_sectors << 9;
+ count = blk_rq_sectors(msb->block_req) << 9;
count /= msb->page_size;
param.system = msb->system;
@@ -745,7 +745,7 @@ static int mspro_block_complete_req(struct memstick_dev *card, int error)
t_len *= msb->page_size;
}
} else
- t_len = msb->block_req->nr_sectors << 9;
+ t_len = blk_rq_sectors(msb->block_req) << 9;
dev_dbg(&card->dev, "transferred %x (%d)\n", t_len, error);
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 56e60f0..510eb47 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -761,7 +761,7 @@ static int i2o_block_transfer(struct request *req)
break;
case CACHE_SMARTFETCH:
- if (req->nr_sectors > 16)
+ if (blk_rq_sectors(req) > 16)
ctl_flags = 0x201F0008;
else
ctl_flags = 0x001F0000;
@@ -781,13 +781,13 @@ static int i2o_block_transfer(struct request *req)
ctl_flags = 0x001F0010;
break;
case CACHE_SMARTBACK:
- if (req->nr_sectors > 16)
+ if (blk_rq_sectors(req) > 16)
ctl_flags = 0x001F0004;
else
ctl_flags = 0x001F0010;
break;
case CACHE_SMARTTHROUGH:
- if (req->nr_sectors > 16)
+ if (blk_rq_sectors(req) > 16)
ctl_flags = 0x001F0004;
else
ctl_flags = 0x001F0010;
@@ -827,22 +827,24 @@ static int i2o_block_transfer(struct request *req)
*mptr++ = cpu_to_le32(scsi_flags);
- *((u32 *) & cmd[2]) = cpu_to_be32(req->sector * hwsec);
- *((u16 *) & cmd[7]) = cpu_to_be16(req->nr_sectors * hwsec);
+ *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec);
+ *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec);
memcpy(mptr, cmd, 10);
mptr += 4;
- *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT);
+ *mptr++ =
+ cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
} else
#endif
{
msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
*mptr++ = cpu_to_le32(ctl_flags);
- *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT);
*mptr++ =
- cpu_to_le32((u32) (req->sector << KERNEL_SECTOR_SHIFT));
+ cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
+ *mptr++ =
+ cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT));
*mptr++ =
- cpu_to_le32(req->sector >> (32 - KERNEL_SECTOR_SHIFT));
+ cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT));
}
if (!i2o_block_sglist_alloc(c, ireq, &mptr)) {
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index fe8041e..949e997 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -243,7 +243,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.mrq.cmd = &brq.cmd;
brq.mrq.data = &brq.data;
- brq.cmd.arg = req->sector;
+ brq.cmd.arg = blk_rq_pos(req);
if (!mmc_card_blockaddr(card))
brq.cmd.arg <<= 9;
brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
@@ -251,7 +251,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.stop.opcode = MMC_STOP_TRANSMISSION;
brq.stop.arg = 0;
brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
- brq.data.blocks = req->nr_sectors;
+ brq.data.blocks = blk_rq_sectors(req);
/*
* After a read error, we redo the request one sector at a time
@@ -293,7 +293,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
* Adjust the sg list so it is the same size as the
* request.
*/
- if (brq.data.blocks != req->nr_sectors) {
+ if (brq.data.blocks != blk_rq_sectors(req)) {
int i, data_size = brq.data.blocks << 9;
struct scatterlist *sg;
@@ -344,8 +344,8 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
printk(KERN_ERR "%s: error %d transferring data,"
" sector %u, nr %u, card status %#x\n",
req->rq_disk->disk_name, brq.data.error,
- (unsigned)req->sector,
- (unsigned)req->nr_sectors, status);
+ (unsigned)blk_rq_pos(req),
+ (unsigned)blk_rq_sectors(req), status);
}
if (brq.stop.error) {
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 76c4c8d..4ea2e67 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -47,8 +47,8 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
unsigned long block, nsect;
char *buf;
- block = req->sector << 9 >> tr->blkshift;
- nsect = req->current_nr_sectors << 9 >> tr->blkshift;
+ block = blk_rq_pos(req) << 9 >> tr->blkshift;
+ nsect = blk_rq_cur_sectors(req) << 9 >> tr->blkshift;
buf = req->buffer;
@@ -59,7 +59,8 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
if (!blk_fs_request(req))
return -EIO;
- if (req->sector + req->current_nr_sectors > get_capacity(req->rq_disk))
+ if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
+ get_capacity(req->rq_disk))
return -EIO;
switch(rq_data_dir(req)) {
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index fabec95..7df03c7 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -603,7 +603,7 @@ static void dasd_profile_end(struct dasd_block *block,
if (dasd_profile_level != DASD_PROFILE_ON)
return;
- sectors = req->nr_sectors;
+ sectors = blk_rq_sectors(req);
if (!cqr->buildclk || !cqr->startclk ||
!cqr->stopclk || !cqr->endclk ||
!sectors)
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index b9a7f77..2efaddf 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -505,8 +505,9 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
return ERR_PTR(-EINVAL);
blksize = block->bp_block;
/* Calculate record id of first and last block. */
- first_rec = req->sector >> block->s2b_shift;
- last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
+ first_rec = blk_rq_pos(req) >> block->s2b_shift;
+ last_rec =
+ (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
/* Check struct bio and count the number of blocks for the request. */
count = 0;
rq_for_each_segment(bv, req, iter) {
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index cb52da0..a41c940 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2354,10 +2354,10 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
blksize = block->bp_block;
blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
/* Calculate record id of first and last block. */
- first_rec = first_trk = req->sector >> block->s2b_shift;
+ first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
first_offs = sector_div(first_trk, blk_per_trk);
last_rec = last_trk =
- (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
+ (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
last_offs = sector_div(last_trk, blk_per_trk);
cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
@@ -2420,7 +2420,7 @@ dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
private = (struct dasd_eckd_private *) cqr->block->base->private;
blksize = cqr->block->bp_block;
blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
- recid = req->sector >> cqr->block->s2b_shift;
+ recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
ccw = cqr->cpaddr;
/* Skip over define extent & locate record. */
ccw++;
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index a3eb6fd..8912358 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -270,8 +270,9 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
return ERR_PTR(-EINVAL);
blksize = block->bp_block;
/* Calculate record id of first and last block. */
- first_rec = req->sector >> block->s2b_shift;
- last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
+ first_rec = blk_rq_pos(req) >> block->s2b_shift;
+ last_rec =
+ (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
/* Check struct bio and count the number of blocks for the request. */
count = 0;
cidaw = 0;
@@ -309,7 +310,7 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
ccw = cqr->cpaddr;
/* First ccw is define extent. */
define_extent(ccw++, cqr->data, rq_data_dir(req),
- block->bp_block, req->sector, req->nr_sectors);
+ block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
/* Build locate_record + read/write ccws. */
idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
LO_data = (struct LO_fba_data *) (idaws + cidaw);
diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c
index 5f8e8ef..2d00a38 100644
--- a/drivers/s390/char/tape_34xx.c
+++ b/drivers/s390/char/tape_34xx.c
@@ -1134,7 +1134,7 @@ tape_34xx_bread(struct tape_device *device, struct request *req)
/* Setup ccws. */
request->op = TO_BLOCK;
start_block = (struct tape_34xx_block_id *) request->cpdata;
- start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B;
+ start_block->block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B;
DBF_EVENT(6, "start_block = %i\n", start_block->block);
ccw = request->cpaddr;
diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c
index 823b05b..c453b2f 100644
--- a/drivers/s390/char/tape_3590.c
+++ b/drivers/s390/char/tape_3590.c
@@ -633,7 +633,7 @@ tape_3590_bread(struct tape_device *device, struct request *req)
struct req_iterator iter;
DBF_EVENT(6, "xBREDid:");
- start_block = req->sector >> TAPEBLOCK_HSEC_S2B;
+ start_block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B;
DBF_EVENT(6, "start_block = %i\n", start_block);
rq_for_each_segment(bv, req, iter)
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 86596d3..5d035e4 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -87,7 +87,7 @@ __tapeblock_end_request(struct tape_request *ccw_req, void *data)
if (ccw_req->rc == 0)
/* Update position. */
device->blk_data.block_position =
- (req->sector + req->nr_sectors) >> TAPEBLOCK_HSEC_S2B;
+ (blk_rq_pos(req) + blk_rq_sectors(req)) >> TAPEBLOCK_HSEC_S2B;
else
/* We lost the position information due to an error. */
device->blk_data.block_position = -1;
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index 0961788..2132c90 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -188,8 +188,8 @@ static void jsfd_do_request(struct request_queue *q)
while ((req = elv_next_request(q)) != NULL) {
struct jsfd_part *jdp = req->rq_disk->private_data;
- unsigned long offset = req->sector << 9;
- size_t len = req->current_nr_sectors << 9;
+ unsigned long offset = blk_rq_pos(req) << 9;
+ size_t len = blk_rq_cur_sectors(req) << 9;
if ((offset + len) > jdp->dsize) {
__blk_end_request_cur(req, -EIO);
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index be5099d..c7076ce 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1825,7 +1825,7 @@ static int eata2x_queuecommand(struct scsi_cmnd *SCpnt,
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type)) {
ha->cp_stat[i] = READY;
- flush_dev(SCpnt->device, SCpnt->request->sector, ha, 0);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), ha, 0);
return 0;
}
@@ -2144,13 +2144,13 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
if (!cpp->din)
input_only = 0;
- if (SCpnt->request->sector < minsec)
- minsec = SCpnt->request->sector;
- if (SCpnt->request->sector > maxsec)
- maxsec = SCpnt->request->sector;
+ if (blk_rq_pos(SCpnt->request) < minsec)
+ minsec = blk_rq_pos(SCpnt->request);
+ if (blk_rq_pos(SCpnt->request) > maxsec)
+ maxsec = blk_rq_pos(SCpnt->request);
- sl[n] = SCpnt->request->sector;
- ioseek += SCpnt->request->nr_sectors;
+ sl[n] = blk_rq_pos(SCpnt->request);
+ ioseek += blk_rq_sectors(SCpnt->request);
if (!n)
continue;
@@ -2190,7 +2190,7 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
k = il[n];
cpp = &ha->cp[k];
SCpnt = cpp->SCpnt;
- ll[n] = SCpnt->request->nr_sectors;
+ ll[n] = blk_rq_sectors(SCpnt->request);
pl[n] = SCpnt->serial_number;
if (!n)
@@ -2236,12 +2236,12 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
cpp = &ha->cp[k];
SCpnt = cpp->SCpnt;
scmd_printk(KERN_INFO, SCpnt,
- "%s pid %ld mb %d fc %d nr %d sec %ld ns %ld"
+ "%s pid %ld mb %d fc %d nr %d sec %ld ns %u"
" cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
(ihdlr ? "ihdlr" : "qcomm"),
SCpnt->serial_number, k, flushcount,
- n_ready, SCpnt->request->sector,
- SCpnt->request->nr_sectors, cursec, YESNO(s),
+ n_ready, blk_rq_pos(SCpnt->request),
+ blk_rq_sectors(SCpnt->request), cursec, YESNO(s),
YESNO(r), YESNO(rev), YESNO(input_only),
YESNO(overlap), cpp->din);
}
@@ -2408,7 +2408,7 @@ static irqreturn_t ihdlr(struct Scsi_Host *shost)
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type))
- flush_dev(SCpnt->device, SCpnt->request->sector, ha, 1);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), ha, 1);
tstatus = status_byte(spp->target_status);
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 36fd2e7..a8fab39 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -1313,10 +1313,10 @@ lpfc_parse_bg_err(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd,
uint32_t bgstat = bgf->bgstat;
uint64_t failing_sector = 0;
- printk(KERN_ERR "BG ERROR in cmd 0x%x lba 0x%llx blk cnt 0x%lx "
+ printk(KERN_ERR "BG ERROR in cmd 0x%x lba 0x%llx blk cnt 0x%x "
"bgstat=0x%x bghm=0x%x\n",
cmd->cmnd[0], (unsigned long long)scsi_get_lba(cmd),
- cmd->request->nr_sectors, bgstat, bghm);
+ blk_rq_sectors(cmd->request), bgstat, bghm);
spin_lock(&_dump_buf_lock);
if (!_dump_buf_done) {
@@ -2375,15 +2375,15 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
if (cmnd->cmnd[0] == READ_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9035 BLKGRD: READ @ sector %llu, "
- "count %lu\n",
- (unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors);
+ "count %u\n",
+ (unsigned long long)scsi_get_lba(cmnd),
+ blk_rq_sectors(cmnd->request));
else if (cmnd->cmnd[0] == WRITE_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9036 BLKGRD: WRITE @ sector %llu, "
- "count %lu cmd=%p\n",
+ "count %u cmd=%p\n",
(unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors,
+ blk_rq_sectors(cmnd->request),
cmnd);
err = lpfc_bg_scsi_prep_dma_buf(phba, lpfc_cmd);
@@ -2403,15 +2403,15 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
if (cmnd->cmnd[0] == READ_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9040 dbg: READ @ sector %llu, "
- "count %lu\n",
+ "count %u\n",
(unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors);
+ blk_rq_sectors(cmnd->request));
else if (cmnd->cmnd[0] == WRITE_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9041 dbg: WRITE @ sector %llu, "
- "count %lu cmd=%p\n",
+ "count %u cmd=%p\n",
(unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors, cmnd);
+ blk_rq_sectors(cmnd->request), cmnd);
else
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9042 dbg: parser not implemented\n");
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9ff0ca9..39b3acf 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -787,9 +787,9 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
* Next deal with any sectors which we were able to correctly
* handle.
*/
- SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, "
+ SCSI_LOG_HLCOMPLETE(1, printk("%u sectors total, "
"%d bytes done.\n",
- req->nr_sectors, good_bytes));
+ blk_rq_sectors(req), good_bytes));
/*
* Recovered errors need reporting, but they're always treated
@@ -968,7 +968,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
if (blk_pc_request(req))
sdb->length = req->data_len;
else
- sdb->length = req->nr_sectors << 9;
+ sdb->length = blk_rq_sectors(req) << 9;
return BLKPREP_OK;
}
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3fcb64b..70c4dd9 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -383,9 +383,9 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
struct scsi_device *sdp = q->queuedata;
struct gendisk *disk = rq->rq_disk;
struct scsi_disk *sdkp;
- sector_t block = rq->sector;
+ sector_t block = blk_rq_pos(rq);
sector_t threshold;
- unsigned int this_count = rq->nr_sectors;
+ unsigned int this_count = blk_rq_sectors(rq);
int ret, host_dif;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
@@ -412,10 +412,10 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
this_count));
if (!sdp || !scsi_device_online(sdp) ||
- block + rq->nr_sectors > get_capacity(disk)) {
+ block + blk_rq_sectors(rq) > get_capacity(disk)) {
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
- "Finishing %ld sectors\n",
- rq->nr_sectors));
+ "Finishing %u sectors\n",
+ blk_rq_sectors(rq)));
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
"Retry with 0x%p\n", SCpnt));
goto out;
@@ -462,7 +462,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
* for this.
*/
if (sdp->sector_size == 1024) {
- if ((block & 1) || (rq->nr_sectors & 1)) {
+ if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
scmd_printk(KERN_ERR, SCpnt,
"Bad block number requested\n");
goto out;
@@ -472,7 +472,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
}
}
if (sdp->sector_size == 2048) {
- if ((block & 3) || (rq->nr_sectors & 3)) {
+ if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
scmd_printk(KERN_ERR, SCpnt,
"Bad block number requested\n");
goto out;
@@ -482,7 +482,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
}
}
if (sdp->sector_size == 4096) {
- if ((block & 7) || (rq->nr_sectors & 7)) {
+ if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
scmd_printk(KERN_ERR, SCpnt,
"Bad block number requested\n");
goto out;
@@ -511,10 +511,10 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
}
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
- "%s %d/%ld 512 byte blocks.\n",
+ "%s %d/%u 512 byte blocks.\n",
(rq_data_dir(rq) == WRITE) ?
"writing" : "reading", this_count,
- rq->nr_sectors));
+ blk_rq_sectors(rq)));
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
@@ -970,8 +970,8 @@ static struct block_device_operations sd_fops = {
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
{
- u64 start_lba = scmd->request->sector;
- u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
+ u64 start_lba = blk_rq_pos(scmd->request);
+ u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
u64 bad_lba;
int info_valid;
diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 184dff4..82f14a9 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -507,7 +507,7 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
sector_sz = scmd->device->sector_size;
sectors = good_bytes / sector_sz;
- phys = scmd->request->sector & 0xffffffff;
+ phys = blk_rq_pos(scmd->request) & 0xffffffff;
if (sector_sz == 4096)
phys >>= 3;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 0e1a0f2..fddba53 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -292,7 +292,8 @@ static int sr_done(struct scsi_cmnd *SCpnt)
if (cd->device->sector_size == 2048)
error_sector <<= 2;
error_sector &= ~(block_sectors - 1);
- good_bytes = (error_sector - SCpnt->request->sector) << 9;
+ good_bytes = (error_sector -
+ blk_rq_pos(SCpnt->request)) << 9;
if (good_bytes < 0 || good_bytes >= this_count)
good_bytes = 0;
/*
@@ -349,8 +350,8 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
cd->disk->disk_name, block));
if (!cd->device || !scsi_device_online(cd->device)) {
- SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
- rq->nr_sectors));
+ SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
+ blk_rq_sectors(rq)));
SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
goto out;
}
@@ -413,7 +414,7 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
/*
* request doesn't start on hw block boundary, add scatter pads
*/
- if (((unsigned int)rq->sector % (s_size >> 9)) ||
+ if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
(scsi_bufflen(SCpnt) % s_size)) {
scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
goto out;
@@ -422,14 +423,14 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
- SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
+ SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
cd->cdi.name,
(rq_data_dir(rq) == WRITE) ?
"writing" : "reading",
- this_count, rq->nr_sectors));
+ this_count, blk_rq_sectors(rq)));
SCpnt->cmnd[1] = 0;
- block = (unsigned int)rq->sector / (s_size >> 9);
+ block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
if (this_count > 0xffff) {
this_count = 0xffff;
diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c
index 601e951..54023d4 100644
--- a/drivers/scsi/u14-34f.c
+++ b/drivers/scsi/u14-34f.c
@@ -1306,7 +1306,7 @@ static int u14_34f_queuecommand(struct scsi_cmnd *SCpnt, void (*done)(struct scs
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type)) {
HD(j)->cp_stat[i] = READY;
- flush_dev(SCpnt->device, SCpnt->request->sector, j, FALSE);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), j, FALSE);
return 0;
}
@@ -1610,11 +1610,13 @@ static int reorder(unsigned int j, unsigned long cursec,
if (!(cpp->xdir == DTD_IN)) input_only = FALSE;
- if (SCpnt->request->sector < minsec) minsec = SCpnt->request->sector;
- if (SCpnt->request->sector > maxsec) maxsec = SCpnt->request->sector;
+ if (blk_rq_pos(SCpnt->request) < minsec)
+ minsec = blk_rq_pos(SCpnt->request);
+ if (blk_rq_pos(SCpnt->request) > maxsec)
+ maxsec = blk_rq_pos(SCpnt->request);
- sl[n] = SCpnt->request->sector;
- ioseek += SCpnt->request->nr_sectors;
+ sl[n] = blk_rq_pos(SCpnt->request);
+ ioseek += blk_rq_sectors(SCpnt->request);
if (!n) continue;
@@ -1642,7 +1644,7 @@ static int reorder(unsigned int j, unsigned long cursec,
if (!input_only) for (n = 0; n < n_ready; n++) {
k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
- ll[n] = SCpnt->request->nr_sectors; pl[n] = SCpnt->serial_number;
+ ll[n] = blk_rq_sectors(SCpnt->request); pl[n] = SCpnt->serial_number;
if (!n) continue;
@@ -1666,12 +1668,12 @@ static int reorder(unsigned int j, unsigned long cursec,
if (link_statistics && (overlap || !(flushcount % link_statistics)))
for (n = 0; n < n_ready; n++) {
k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
- printk("%s %d.%d:%d pid %ld mb %d fc %d nr %d sec %ld ns %ld"\
+ printk("%s %d.%d:%d pid %ld mb %d fc %d nr %d sec %ld ns %u"\
" cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
(ihdlr ? "ihdlr" : "qcomm"), SCpnt->channel, SCpnt->target,
SCpnt->lun, SCpnt->serial_number, k, flushcount, n_ready,
- SCpnt->request->sector, SCpnt->request->nr_sectors, cursec,
- YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
+ blk_rq_pos(SCpnt->request), blk_rq_sectors(SCpnt->request),
+ cursec, YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
YESNO(overlap), cpp->xdir);
}
#endif
@@ -1799,7 +1801,7 @@ static irqreturn_t ihdlr(unsigned int j)
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type))
- flush_dev(SCpnt->device, SCpnt->request->sector, j, TRUE);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), j, TRUE);
tstatus = status_byte(spp->target_status);
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 43b50d3..3878d1d 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -270,7 +270,7 @@ static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
{
- return scmd->request->sector;
+ return blk_rq_pos(scmd->request);
}
static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 05/11] block: convert to pos and nr_sectors accessors
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo, Jeff Garzik
With recent cleanups, there is no place where low level driver
directly manipulates request fields. This means that the 'hard'
request fields always equal the !hard fields. Convert all
rq->sectors, nr_sectors and current_nr_sectors references to
accessors.
[ Impact: use pos and nr_sectors accessors ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Tested-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Tim Waugh <tim@cyberelk.net>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Dario Ballabio <ballabio_dario@emc.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
---
arch/um/drivers/ubd_kern.c | 2 +-
block/as-iosched.c | 18 ++++++-----
block/blk-barrier.c | 2 +-
block/blk-core.c | 17 +++++------
block/blk-merge.c | 10 +++---
block/cfq-iosched.c | 18 ++++++------
block/deadline-iosched.c | 2 +-
block/elevator.c | 22 +++++++-------
drivers/block/DAC960.c | 6 ++--
drivers/block/amiflop.c | 6 ++--
drivers/block/ataflop.c | 10 +++---
drivers/block/cciss.c | 22 +++++++-------
drivers/block/cpqarray.c | 9 +++--
drivers/block/floppy.c | 53 ++++++++++++++++++-----------------
drivers/block/hd.c | 14 ++++----
drivers/block/nbd.c | 12 ++++----
drivers/block/paride/pcd.c | 4 +-
drivers/block/paride/pd.c | 8 ++--
drivers/block/paride/pf.c | 8 ++--
drivers/block/ps3disk.c | 9 ++---
drivers/block/sunvdc.c | 2 +-
drivers/block/swim3.c | 34 ++++++++++++----------
drivers/block/sx8.c | 6 ++--
drivers/block/ub.c | 6 ++--
drivers/block/viodasd.c | 2 +-
drivers/block/virtio_blk.c | 2 +-
drivers/block/xd.c | 4 +-
drivers/block/xen-blkfront.c | 11 +++----
drivers/block/xsysace.c | 17 ++++++-----
drivers/block/z2ram.c | 6 ++--
drivers/cdrom/gdrom.c | 6 ++--
drivers/cdrom/viocd.c | 2 +-
drivers/memstick/core/mspro_block.c | 6 ++--
drivers/message/i2o/i2o_block.c | 20 +++++++------
drivers/mmc/card/block.c | 10 +++---
drivers/mtd/mtd_blkdevs.c | 7 ++--
drivers/s390/block/dasd.c | 2 +-
drivers/s390/block/dasd_diag.c | 5 ++-
drivers/s390/block/dasd_eckd.c | 6 ++--
drivers/s390/block/dasd_fba.c | 7 ++--
drivers/s390/char/tape_34xx.c | 2 +-
drivers/s390/char/tape_3590.c | 2 +-
drivers/s390/char/tape_block.c | 2 +-
drivers/sbus/char/jsflash.c | 4 +-
drivers/scsi/eata.c | 24 ++++++++--------
drivers/scsi/lpfc/lpfc_scsi.c | 22 +++++++-------
drivers/scsi/scsi_lib.c | 6 ++--
drivers/scsi/sd.c | 24 ++++++++--------
drivers/scsi/sd_dif.c | 2 +-
drivers/scsi/sr.c | 15 +++++----
drivers/scsi/u14-34f.c | 22 ++++++++------
include/scsi/scsi_cmnd.h | 2 +-
52 files changed, 276 insertions(+), 264 deletions(-)
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 4330127..402ba8f 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1239,7 +1239,7 @@ static void do_ubd_request(struct request_queue *q)
}
req = dev->request;
- sector = req->sector;
+ sector = blk_rq_pos(req);
while(dev->start_sg < dev->end_sg){
struct scatterlist *sg = &dev->sg[dev->start_sg];
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 45bd070..7a12cf6 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -306,8 +306,8 @@ as_choose_req(struct as_data *ad, struct request *rq1, struct request *rq2)
data_dir = rq_is_sync(rq1);
last = ad->last_sector[data_dir];
- s1 = rq1->sector;
- s2 = rq2->sector;
+ s1 = blk_rq_pos(rq1);
+ s2 = blk_rq_pos(rq2);
BUG_ON(data_dir != rq_is_sync(rq2));
@@ -566,13 +566,15 @@ static void as_update_iohist(struct as_data *ad, struct as_io_context *aic,
as_update_thinktime(ad, aic, thinktime);
/* Calculate read -> read seek distance */
- if (aic->last_request_pos < rq->sector)
- seek_dist = rq->sector - aic->last_request_pos;
+ if (aic->last_request_pos < blk_rq_pos(rq))
+ seek_dist = blk_rq_pos(rq) -
+ aic->last_request_pos;
else
- seek_dist = aic->last_request_pos - rq->sector;
+ seek_dist = aic->last_request_pos -
+ blk_rq_pos(rq);
as_update_seekdist(ad, aic, seek_dist);
}
- aic->last_request_pos = rq->sector + rq->nr_sectors;
+ aic->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
set_bit(AS_TASK_IOSTARTED, &aic->state);
spin_unlock(&aic->lock);
}
@@ -587,7 +589,7 @@ static int as_close_req(struct as_data *ad, struct as_io_context *aic,
{
unsigned long delay; /* jiffies */
sector_t last = ad->last_sector[ad->batch_data_dir];
- sector_t next = rq->sector;
+ sector_t next = blk_rq_pos(rq);
sector_t delta; /* acceptable close offset (in sectors) */
sector_t s;
@@ -981,7 +983,7 @@ static void as_move_to_dispatch(struct as_data *ad, struct request *rq)
* This has to be set in order to be correctly updated by
* as_find_next_rq
*/
- ad->last_sector[data_dir] = rq->sector + rq->nr_sectors;
+ ad->last_sector[data_dir] = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (data_dir == BLK_RW_SYNC) {
struct io_context *ioc = RQ_IOC(rq);
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index c167de5..8713c2f 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -324,7 +324,7 @@ int blkdev_issue_flush(struct block_device *bdev, sector_t *error_sector)
/*
* The driver must store the error location in ->bi_sector, if
* it supports it. For non-stacked drivers, this should be copied
- * from rq->sector.
+ * from blk_rq_pos(rq).
*/
if (error_sector)
*error_sector = bio->bi_sector;
diff --git a/block/blk-core.c b/block/blk-core.c
index 895e55b..82dc206 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -72,7 +72,7 @@ static void drive_stat_acct(struct request *rq, int new_io)
return;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(rq->rq_disk, rq->sector);
+ part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
if (!new_io)
part_stat_inc(cpu, part, merges[rw]);
@@ -185,10 +185,9 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
rq->rq_disk ? rq->rq_disk->disk_name : "?", rq->cmd_type,
rq->cmd_flags);
- printk(KERN_INFO " sector %llu, nr/cnr %lu/%u\n",
- (unsigned long long)rq->sector,
- rq->nr_sectors,
- rq->current_nr_sectors);
+ printk(KERN_INFO " sector %llu, nr/cnr %u/%u\n",
+ (unsigned long long)blk_rq_pos(rq),
+ blk_rq_sectors(rq), blk_rq_cur_sectors(rq));
printk(KERN_INFO " bio %p, biotail %p, buffer %p, len %u\n",
rq->bio, rq->biotail,
rq->buffer, rq->data_len);
@@ -1557,7 +1556,7 @@ EXPORT_SYMBOL(submit_bio);
*/
int blk_rq_check_limits(struct request_queue *q, struct request *rq)
{
- if (rq->nr_sectors > q->max_sectors ||
+ if (blk_rq_sectors(rq) > q->max_sectors ||
rq->data_len > q->max_hw_sectors << 9) {
printk(KERN_ERR "%s: over max size limit.\n", __func__);
return -EIO;
@@ -1645,7 +1644,7 @@ static void blk_account_io_completion(struct request *req, unsigned int bytes)
int cpu;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_stat_add(cpu, part, sectors[rw], bytes >> 9);
part_stat_unlock();
}
@@ -1665,7 +1664,7 @@ static void blk_account_io_done(struct request *req)
int cpu;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
@@ -1846,7 +1845,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
if (error && (blk_fs_request(req) && !(req->cmd_flags & REQ_QUIET))) {
printk(KERN_ERR "end_request: I/O error, dev %s, sector %llu\n",
req->rq_disk ? req->rq_disk->disk_name : "?",
- (unsigned long long)req->sector);
+ (unsigned long long)blk_rq_pos(req));
}
blk_account_io_completion(req, nr_bytes);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 23d2a6f..bf62a87 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -259,7 +259,7 @@ int ll_back_merge_fn(struct request_queue *q, struct request *req,
else
max_sectors = q->max_sectors;
- if (req->nr_sectors + bio_sectors(bio) > max_sectors) {
+ if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@@ -284,7 +284,7 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
max_sectors = q->max_sectors;
- if (req->nr_sectors + bio_sectors(bio) > max_sectors) {
+ if (blk_rq_sectors(req) + bio_sectors(bio) > max_sectors) {
req->cmd_flags |= REQ_NOMERGE;
if (req == q->last_merge)
q->last_merge = NULL;
@@ -315,7 +315,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
/*
* Will it become too large?
*/
- if ((req->nr_sectors + next->nr_sectors) > q->max_sectors)
+ if ((blk_rq_sectors(req) + blk_rq_sectors(next)) > q->max_sectors)
return 0;
total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;
@@ -345,7 +345,7 @@ static void blk_account_io_merge(struct request *req)
int cpu;
cpu = part_stat_lock();
- part = disk_map_sector_rcu(req->rq_disk, req->sector);
+ part = disk_map_sector_rcu(req->rq_disk, blk_rq_pos(req));
part_round_stats(cpu, part);
part_dec_in_flight(part);
@@ -366,7 +366,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
/*
* not contiguous
*/
- if (req->sector + req->nr_sectors != next->sector)
+ if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
return 0;
if (rq_data_dir(req) != rq_data_dir(next)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 575083a..db4d990 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -349,8 +349,8 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2)
else if (rq_is_meta(rq2) && !rq_is_meta(rq1))
return rq2;
- s1 = rq1->sector;
- s2 = rq2->sector;
+ s1 = blk_rq_pos(rq1);
+ s2 = blk_rq_pos(rq2);
last = cfqd->last_position;
@@ -949,10 +949,10 @@ static struct cfq_queue *cfq_set_active_queue(struct cfq_data *cfqd,
static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd,
struct request *rq)
{
- if (rq->sector >= cfqd->last_position)
- return rq->sector - cfqd->last_position;
+ if (blk_rq_pos(rq) >= cfqd->last_position)
+ return blk_rq_pos(rq) - cfqd->last_position;
else
- return cfqd->last_position - rq->sector;
+ return cfqd->last_position - blk_rq_pos(rq);
}
#define CIC_SEEK_THR 8 * 1024
@@ -1918,10 +1918,10 @@ cfq_update_io_seektime(struct cfq_data *cfqd, struct cfq_io_context *cic,
if (!cic->last_request_pos)
sdist = 0;
- else if (cic->last_request_pos < rq->sector)
- sdist = rq->sector - cic->last_request_pos;
+ else if (cic->last_request_pos < blk_rq_pos(rq))
+ sdist = blk_rq_pos(rq) - cic->last_request_pos;
else
- sdist = cic->last_request_pos - rq->sector;
+ sdist = cic->last_request_pos - blk_rq_pos(rq);
/*
* Don't allow the seek distance to get too large from the
@@ -2071,7 +2071,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfq_update_io_seektime(cfqd, cic, rq);
cfq_update_idle_window(cfqd, cfqq, cic);
- cic->last_request_pos = rq->sector + rq->nr_sectors;
+ cic->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (cfqq == cfqd->active_queue) {
/*
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index c4d991d..b547cbc 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -138,7 +138,7 @@ deadline_merge(struct request_queue *q, struct request **req, struct bio *bio)
__rq = elv_rb_find(&dd->sort_list[bio_data_dir(bio)], sector);
if (__rq) {
- BUG_ON(sector != __rq->sector);
+ BUG_ON(sector != blk_rq_pos(__rq));
if (elv_rq_merge_ok(__rq, bio)) {
ret = ELEVATOR_FRONT_MERGE;
diff --git a/block/elevator.c b/block/elevator.c
index 1af5d9f..9189200 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -52,7 +52,7 @@ static const int elv_hash_shift = 6;
#define ELV_HASH_FN(sec) \
(hash_long(ELV_HASH_BLOCK((sec)), elv_hash_shift))
#define ELV_HASH_ENTRIES (1 << elv_hash_shift)
-#define rq_hash_key(rq) ((rq)->sector + (rq)->nr_sectors)
+#define rq_hash_key(rq) (blk_rq_pos(rq) + blk_rq_sectors(rq))
DEFINE_TRACE(block_rq_insert);
DEFINE_TRACE(block_rq_issue);
@@ -119,9 +119,9 @@ static inline int elv_try_merge(struct request *__rq, struct bio *bio)
* we can merge and sequence is ok, check if it's possible
*/
if (elv_rq_merge_ok(__rq, bio)) {
- if (__rq->sector + __rq->nr_sectors == bio->bi_sector)
+ if (blk_rq_pos(__rq) + blk_rq_sectors(__rq) == bio->bi_sector)
ret = ELEVATOR_BACK_MERGE;
- else if (__rq->sector - bio_sectors(bio) == bio->bi_sector)
+ else if (blk_rq_pos(__rq) - bio_sectors(bio) == bio->bi_sector)
ret = ELEVATOR_FRONT_MERGE;
}
@@ -370,9 +370,9 @@ struct request *elv_rb_add(struct rb_root *root, struct request *rq)
parent = *p;
__rq = rb_entry(parent, struct request, rb_node);
- if (rq->sector < __rq->sector)
+ if (blk_rq_pos(rq) < blk_rq_pos(__rq))
p = &(*p)->rb_left;
- else if (rq->sector > __rq->sector)
+ else if (blk_rq_pos(rq) > blk_rq_pos(__rq))
p = &(*p)->rb_right;
else
return __rq;
@@ -400,9 +400,9 @@ struct request *elv_rb_find(struct rb_root *root, sector_t sector)
while (n) {
rq = rb_entry(n, struct request, rb_node);
- if (sector < rq->sector)
+ if (sector < blk_rq_pos(rq))
n = n->rb_left;
- else if (sector > rq->sector)
+ else if (sector > blk_rq_pos(rq))
n = n->rb_right;
else
return rq;
@@ -441,14 +441,14 @@ void elv_dispatch_sort(struct request_queue *q, struct request *rq)
break;
if (pos->cmd_flags & stop_flags)
break;
- if (rq->sector >= boundary) {
- if (pos->sector < boundary)
+ if (blk_rq_pos(rq) >= boundary) {
+ if (blk_rq_pos(pos) < boundary)
continue;
} else {
- if (pos->sector >= boundary)
+ if (blk_rq_pos(pos) >= boundary)
break;
}
- if (rq->sector >= pos->sector)
+ if (blk_rq_pos(rq) >= blk_rq_pos(pos))
break;
}
diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index f22ed6c..774ab05 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -3338,8 +3338,8 @@ static int DAC960_process_queue(DAC960_Controller_T *Controller, struct request_
}
Command->Completion = Request->end_io_data;
Command->LogicalDriveNumber = (long)Request->rq_disk->private_data;
- Command->BlockNumber = Request->sector;
- Command->BlockCount = Request->nr_sectors;
+ Command->BlockNumber = blk_rq_pos(Request);
+ Command->BlockCount = blk_rq_sectors(Request);
Command->Request = Request;
blkdev_dequeue_request(Request);
Command->SegmentCount = blk_rq_map_sg(req_q,
@@ -3431,7 +3431,7 @@ static void DAC960_queue_partial_rw(DAC960_Command_T *Command)
* successfully as possible.
*/
Command->SegmentCount = 1;
- Command->BlockNumber = Request->sector;
+ Command->BlockNumber = blk_rq_pos(Request);
Command->BlockCount = 1;
DAC960_QueueReadWriteCommand(Command);
return;
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 8ff95f2..e4a14b9 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -1351,13 +1351,13 @@ static void redo_fd_request(void)
drive = floppy - unit;
/* Here someone could investigate to be more efficient */
- for (cnt = 0; cnt < CURRENT->current_nr_sectors; cnt++) {
+ for (cnt = 0; cnt < blk_rq_cur_sectors(CURRENT); cnt++) {
#ifdef DEBUG
printk("fd: sector %ld + %d requested for %s\n",
- CURRENT->sector,cnt,
+ blk_rq_pos(CURRENT), cnt,
(rq_data_dir(CURRENT) == READ) ? "read" : "write");
#endif
- block = CURRENT->sector + cnt;
+ block = blk_rq_pos(CURRENT) + cnt;
if ((int)block > floppy->blocks) {
__blk_end_request_cur(CURRENT, -EIO);
goto repeat;
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index 2506728..234024c 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -725,7 +725,7 @@ static void do_fd_action( int drive )
if (IS_BUFFERED( drive, ReqSide, ReqTrack )) {
if (ReqCmd == READ) {
copy_buffer( SECTOR_BUFFER(ReqSector), ReqData );
- if (++ReqCnt < CURRENT->current_nr_sectors) {
+ if (++ReqCnt < blk_rq_cur_sectors(CURRENT)) {
/* read next sector */
setup_req_params( drive );
goto repeat;
@@ -1130,7 +1130,7 @@ static void fd_rwsec_done1(int status)
}
}
- if (++ReqCnt < CURRENT->current_nr_sectors) {
+ if (++ReqCnt < blk_rq_cur_sectors(CURRENT)) {
/* read next sector */
setup_req_params( SelectedDrive );
do_fd_action( SelectedDrive );
@@ -1394,7 +1394,7 @@ static void redo_fd_request(void)
DPRINT(("redo_fd_request: CURRENT=%p dev=%s CURRENT->sector=%ld\n",
CURRENT, CURRENT ? CURRENT->rq_disk->disk_name : "",
- CURRENT ? CURRENT->sector : 0 ));
+ CURRENT ? blk_rq_pos(CURRENT) : 0 ));
IsFormatting = 0;
@@ -1440,7 +1440,7 @@ repeat:
UD.autoprobe = 0;
}
- if (CURRENT->sector + 1 > UDT->blocks) {
+ if (blk_rq_pos(CURRENT) + 1 > UDT->blocks) {
__blk_end_request_cur(CURRENT, -EIO);
goto repeat;
}
@@ -1450,7 +1450,7 @@ repeat:
ReqCnt = 0;
ReqCmd = rq_data_dir(CURRENT);
- ReqBlock = CURRENT->sector;
+ ReqBlock = blk_rq_pos(CURRENT);
ReqBuffer = CURRENT->buffer;
setup_req_params( drive );
do_fd_action( drive );
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index f22d493..ab7b04c 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -2835,10 +2835,10 @@ static void do_cciss_request(struct request_queue *q)
c->Request.Timeout = 0; // Don't time out
c->Request.CDB[0] =
(rq_data_dir(creq) == READ) ? h->cciss_read : h->cciss_write;
- start_blk = creq->sector;
+ start_blk = blk_rq_pos(creq);
#ifdef CCISS_DEBUG
- printk(KERN_DEBUG "ciss: sector =%d nr_sectors=%d\n", (int)creq->sector,
- (int)creq->nr_sectors);
+ printk(KERN_DEBUG "ciss: sector =%d nr_sectors=%d\n",
+ (int)blk_rq_pos(creq), (int)blk_rq_sectors(creq));
#endif /* CCISS_DEBUG */
sg_init_table(tmp_sg, MAXSGENTRIES);
@@ -2864,8 +2864,8 @@ static void do_cciss_request(struct request_queue *q)
h->maxSG = seg;
#ifdef CCISS_DEBUG
- printk(KERN_DEBUG "cciss: Submitting %lu sectors in %d segments\n",
- creq->nr_sectors, seg);
+ printk(KERN_DEBUG "cciss: Submitting %u sectors in %d segments\n",
+ blk_rq_sectors(creq), seg);
#endif /* CCISS_DEBUG */
c->Header.SGList = c->Header.SGTotal = seg;
@@ -2877,8 +2877,8 @@ static void do_cciss_request(struct request_queue *q)
c->Request.CDB[4] = (start_blk >> 8) & 0xff;
c->Request.CDB[5] = start_blk & 0xff;
c->Request.CDB[6] = 0; // (sect >> 24) & 0xff; MSB
- c->Request.CDB[7] = (creq->nr_sectors >> 8) & 0xff;
- c->Request.CDB[8] = creq->nr_sectors & 0xff;
+ c->Request.CDB[7] = (blk_rq_sectors(creq) >> 8) & 0xff;
+ c->Request.CDB[8] = blk_rq_sectors(creq) & 0xff;
c->Request.CDB[9] = c->Request.CDB[11] = c->Request.CDB[12] = 0;
} else {
u32 upper32 = upper_32_bits(start_blk);
@@ -2893,10 +2893,10 @@ static void do_cciss_request(struct request_queue *q)
c->Request.CDB[7]= (start_blk >> 16) & 0xff;
c->Request.CDB[8]= (start_blk >> 8) & 0xff;
c->Request.CDB[9]= start_blk & 0xff;
- c->Request.CDB[10]= (creq->nr_sectors >> 24) & 0xff;
- c->Request.CDB[11]= (creq->nr_sectors >> 16) & 0xff;
- c->Request.CDB[12]= (creq->nr_sectors >> 8) & 0xff;
- c->Request.CDB[13]= creq->nr_sectors & 0xff;
+ c->Request.CDB[10]= (blk_rq_sectors(creq) >> 24) & 0xff;
+ c->Request.CDB[11]= (blk_rq_sectors(creq) >> 16) & 0xff;
+ c->Request.CDB[12]= (blk_rq_sectors(creq) >> 8) & 0xff;
+ c->Request.CDB[13]= blk_rq_sectors(creq) & 0xff;
c->Request.CDB[14] = c->Request.CDB[15] = 0;
}
} else if (blk_pc_request(creq)) {
diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c
index 488a8f4..a5caeff 100644
--- a/drivers/block/cpqarray.c
+++ b/drivers/block/cpqarray.c
@@ -919,10 +919,11 @@ queue_next:
c->hdr.size = sizeof(rblk_t) >> 2;
c->size += sizeof(rblk_t);
- c->req.hdr.blk = creq->sector;
+ c->req.hdr.blk = blk_rq_pos(creq);
c->rq = creq;
DBGPX(
- printk("sector=%d, nr_sectors=%d\n", creq->sector, creq->nr_sectors);
+ printk("sector=%d, nr_sectors=%u\n",
+ blk_rq_pos(creq), blk_rq_sectors(creq));
);
sg_init_table(tmp_sg, SG_MAX);
seg = blk_rq_map_sg(q, creq, tmp_sg);
@@ -940,9 +941,9 @@ DBGPX(
tmp_sg[i].offset,
tmp_sg[i].length, dir);
}
-DBGPX( printk("Submitting %d sectors in %d segments\n", creq->nr_sectors, seg); );
+DBGPX( printk("Submitting %u sectors in %d segments\n", blk_rq_sectors(creq), seg); );
c->req.hdr.sg_cnt = seg;
- c->req.hdr.blk_cnt = creq->nr_sectors;
+ c->req.hdr.blk_cnt = blk_rq_sectors(creq);
c->req.hdr.cmd = (rq_data_dir(creq) == READ) ? IDA_READ : IDA_WRITE;
c->type = CMD_RWREQ;
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 1300df6..4524862 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2303,7 +2303,7 @@ static void floppy_end_request(struct request *req, int error)
/* current_count_sectors can be zero if transfer failed */
if (error)
- nr_sectors = req->current_nr_sectors;
+ nr_sectors = blk_rq_cur_sectors(req);
if (__blk_end_request(req, error, nr_sectors << 9))
return;
@@ -2332,7 +2332,7 @@ static void request_done(int uptodate)
if (uptodate) {
/* maintain values for invalidation on geometry
* change */
- block = current_count_sectors + req->sector;
+ block = current_count_sectors + blk_rq_pos(req);
INFBOUND(DRS->maxblock, block);
if (block > _floppy->sect)
DRS->maxtrack = 1;
@@ -2346,10 +2346,10 @@ static void request_done(int uptodate)
/* record write error information */
DRWE->write_errors++;
if (DRWE->write_errors == 1) {
- DRWE->first_error_sector = req->sector;
+ DRWE->first_error_sector = blk_rq_pos(req);
DRWE->first_error_generation = DRS->generation;
}
- DRWE->last_error_sector = req->sector;
+ DRWE->last_error_sector = blk_rq_pos(req);
DRWE->last_error_generation = DRS->generation;
}
spin_lock_irqsave(q->queue_lock, flags);
@@ -2503,24 +2503,24 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
max_sector = transfer_size(ssize,
min(max_sector, max_sector_2),
- current_req->nr_sectors);
+ blk_rq_sectors(current_req));
if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
- buffer_max > fsector_t + current_req->nr_sectors)
+ buffer_max > fsector_t + blk_rq_sectors(current_req))
current_count_sectors = min_t(int, buffer_max - fsector_t,
- current_req->nr_sectors);
+ blk_rq_sectors(current_req));
remaining = current_count_sectors << 9;
#ifdef FLOPPY_SANITY_CHECK
- if ((remaining >> 9) > current_req->nr_sectors &&
+ if ((remaining >> 9) > blk_rq_sectors(current_req) &&
CT(COMMAND) == FD_WRITE) {
DPRINT("in copy buffer\n");
printk("current_count_sectors=%ld\n", current_count_sectors);
printk("remaining=%d\n", remaining >> 9);
- printk("current_req->nr_sectors=%ld\n",
- current_req->nr_sectors);
+ printk("current_req->nr_sectors=%u\n",
+ blk_rq_sectors(current_req));
printk("current_req->current_nr_sectors=%u\n",
- current_req->current_nr_sectors);
+ blk_rq_cur_sectors(current_req));
printk("max_sector=%d\n", max_sector);
printk("ssize=%d\n", ssize);
}
@@ -2530,7 +2530,7 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
- size = current_req->current_nr_sectors << 9;
+ size = blk_rq_cur_sectors(current_req) << 9;
rq_for_each_segment(bv, current_req, iter) {
if (!remaining)
@@ -2648,10 +2648,10 @@ static int make_raw_rw_request(void)
max_sector = _floppy->sect * _floppy->head;
- TRACK = (int)current_req->sector / max_sector;
- fsector_t = (int)current_req->sector % max_sector;
+ TRACK = (int)blk_rq_pos(current_req) / max_sector;
+ fsector_t = (int)blk_rq_pos(current_req) % max_sector;
if (_floppy->track && TRACK >= _floppy->track) {
- if (current_req->current_nr_sectors & 1) {
+ if (blk_rq_cur_sectors(current_req) & 1) {
current_count_sectors = 1;
return 1;
} else
@@ -2669,7 +2669,7 @@ static int make_raw_rw_request(void)
if (fsector_t >= max_sector) {
current_count_sectors =
min_t(int, _floppy->sect - fsector_t,
- current_req->nr_sectors);
+ blk_rq_sectors(current_req));
return 1;
}
SIZECODE = 2;
@@ -2720,7 +2720,7 @@ static int make_raw_rw_request(void)
in_sector_offset = (fsector_t % _floppy->sect) % ssize;
aligned_sector_t = fsector_t - in_sector_offset;
- max_size = current_req->nr_sectors;
+ max_size = blk_rq_sectors(current_req);
if ((raw_cmd->track == buffer_track) &&
(current_drive == buffer_drive) &&
(fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
@@ -2729,10 +2729,10 @@ static int make_raw_rw_request(void)
copy_buffer(1, max_sector, buffer_max);
return 1;
}
- } else if (in_sector_offset || current_req->nr_sectors < ssize) {
+ } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
if (CT(COMMAND) == FD_WRITE) {
- if (fsector_t + current_req->nr_sectors > ssize &&
- fsector_t + current_req->nr_sectors < ssize + ssize)
+ if (fsector_t + blk_rq_sectors(current_req) > ssize &&
+ fsector_t + blk_rq_sectors(current_req) < ssize + ssize)
max_size = ssize + ssize;
else
max_size = ssize;
@@ -2776,7 +2776,7 @@ static int make_raw_rw_request(void)
(indirect * 2 > direct * 3 &&
*errors < DP->max_errors.read_track && ((!probing
|| (DP->read_track & (1 << DRS->probed_format)))))) {
- max_size = current_req->nr_sectors;
+ max_size = blk_rq_sectors(current_req);
} else {
raw_cmd->kernel_data = current_req->buffer;
raw_cmd->length = current_count_sectors << 9;
@@ -2801,7 +2801,7 @@ static int make_raw_rw_request(void)
fsector_t > buffer_max ||
fsector_t < buffer_min ||
((CT(COMMAND) == FD_READ ||
- (!in_sector_offset && current_req->nr_sectors >= ssize)) &&
+ (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
max_sector > 2 * max_buffer_sectors + buffer_min &&
max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
/* not enough space */
@@ -2879,8 +2879,8 @@ static int make_raw_rw_request(void)
printk("write\n");
return 0;
}
- } else if (raw_cmd->length > current_req->nr_sectors << 9 ||
- current_count_sectors > current_req->nr_sectors) {
+ } else if (raw_cmd->length > blk_rq_sectors(current_req) << 9 ||
+ current_count_sectors > blk_rq_sectors(current_req)) {
DPRINT("buffer overrun in direct transfer\n");
return 0;
} else if (raw_cmd->length < current_count_sectors << 9) {
@@ -2990,8 +2990,9 @@ static void do_fd_request(struct request_queue * q)
if (usage_count == 0) {
printk("warning: usage count=0, current_req=%p exiting\n",
current_req);
- printk("sect=%ld type=%x flags=%x\n", (long)current_req->sector,
- current_req->cmd_type, current_req->cmd_flags);
+ printk("sect=%ld type=%x flags=%x\n",
+ (long)blk_rq_pos(current_req), current_req->cmd_type,
+ current_req->cmd_flags);
return;
}
if (test_bit(0, &fdc_busy)) {
diff --git a/drivers/block/hd.c b/drivers/block/hd.c
index 75b9ca9..a3b3994 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -228,7 +228,7 @@ static void dump_status(const char *msg, unsigned int stat)
printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL),
inb(HD_CURRENT) & 0xf, inb(HD_SECTOR));
if (CURRENT)
- printk(", sector=%ld", CURRENT->sector);
+ printk(", sector=%ld", blk_rq_pos(CURRENT));
}
printk("\n");
}
@@ -457,9 +457,9 @@ ok_to_read:
req = CURRENT;
insw(HD_DATA, req->buffer, 256);
#ifdef DEBUG
- printk("%s: read: sector %ld, remaining = %ld, buffer=%p\n",
- req->rq_disk->disk_name, req->sector + 1, req->nr_sectors - 1,
- req->buffer+512);
+ printk("%s: read: sector %ld, remaining = %u, buffer=%p\n",
+ req->rq_disk->disk_name, blk_rq_pos(req) + 1,
+ blk_rq_sectors(req) - 1, req->buffer+512);
#endif
if (__blk_end_request(req, 0, 512)) {
SET_HANDLER(&read_intr);
@@ -485,7 +485,7 @@ static void write_intr(void)
continue;
if (!OK_STATUS(i))
break;
- if ((req->nr_sectors <= 1) || (i & DRQ_STAT))
+ if ((blk_rq_sectors(req) <= 1) || (i & DRQ_STAT))
goto ok_to_write;
} while (--retries > 0);
dump_status("write_intr", i);
@@ -589,8 +589,8 @@ repeat:
return;
}
disk = req->rq_disk->private_data;
- block = req->sector;
- nsect = req->nr_sectors;
+ block = blk_rq_pos(req);
+ nsect = blk_rq_sectors(req);
if (block >= get_capacity(req->rq_disk) ||
((block+nsect) > get_capacity(req->rq_disk))) {
printk("%s: bad access: block=%d, count=%d\n",
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index a9ab8be..977a573 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -110,7 +110,7 @@ static void nbd_end_request(struct request *req)
req, error ? "failed" : "done");
spin_lock_irqsave(q->queue_lock, flags);
- __blk_end_request(req, error, req->nr_sectors << 9);
+ __blk_end_request(req, error, blk_rq_sectors(req) << 9);
spin_unlock_irqrestore(q->queue_lock, flags);
}
@@ -231,19 +231,19 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
{
int result, flags;
struct nbd_request request;
- unsigned long size = req->nr_sectors << 9;
+ unsigned long size = blk_rq_sectors(req) << 9;
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(nbd_cmd(req));
- request.from = cpu_to_be64((u64) req->sector << 9);
+ request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
request.len = htonl(size);
memcpy(request.handle, &req, sizeof(req));
- dprintk(DBG_TX, "%s: request %p: sending control (%s@%llu,%luB)\n",
+ dprintk(DBG_TX, "%s: request %p: sending control (%s@%llu,%uB)\n",
lo->disk->disk_name, req,
nbdcmd_to_ascii(nbd_cmd(req)),
- (unsigned long long)req->sector << 9,
- req->nr_sectors << 9);
+ (unsigned long long)blk_rq_pos(req) << 9,
+ blk_rq_sectors(req) << 9);
result = sock_xmit(lo, 1, &request, sizeof(request),
(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
if (result <= 0) {
diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 9fd57c2..2d5dc0a 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -728,8 +728,8 @@ static void do_pcd_request(struct request_queue * q)
if (cd != pcd_current)
pcd_bufblk = -1;
pcd_current = cd;
- pcd_sector = pcd_req->sector;
- pcd_count = pcd_req->current_nr_sectors;
+ pcd_sector = blk_rq_pos(pcd_req);
+ pcd_count = blk_rq_cur_sectors(pcd_req);
pcd_buf = pcd_req->buffer;
pcd_busy = 1;
ps_set_intr(do_pcd_read, NULL, 0, nice);
diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index 0732df4..9ec5d4a 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -444,11 +444,11 @@ static enum action do_pd_io_start(void)
pd_cmd = rq_data_dir(pd_req);
if (pd_cmd == READ || pd_cmd == WRITE) {
- pd_block = pd_req->sector;
- pd_count = pd_req->current_nr_sectors;
+ pd_block = blk_rq_pos(pd_req);
+ pd_count = blk_rq_cur_sectors(pd_req);
if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
return Fail;
- pd_run = pd_req->nr_sectors;
+ pd_run = blk_rq_sectors(pd_req);
pd_buf = pd_req->buffer;
pd_retries = 0;
if (pd_cmd == READ)
@@ -479,7 +479,7 @@ static int pd_next_buf(void)
return 0;
spin_lock_irqsave(&pd_lock, saved_flags);
__blk_end_request_cur(pd_req, 0);
- pd_count = pd_req->current_nr_sectors;
+ pd_count = blk_rq_cur_sectors(pd_req);
pd_buf = pd_req->buffer;
spin_unlock_irqrestore(&pd_lock, saved_flags);
return 0;
diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c
index 3871e35..e88c889 100644
--- a/drivers/block/paride/pf.c
+++ b/drivers/block/paride/pf.c
@@ -768,9 +768,9 @@ repeat:
return;
pf_current = pf_req->rq_disk->private_data;
- pf_block = pf_req->sector;
- pf_run = pf_req->nr_sectors;
- pf_count = pf_req->current_nr_sectors;
+ pf_block = blk_rq_pos(pf_req);
+ pf_run = blk_rq_sectors(pf_req);
+ pf_count = blk_rq_cur_sectors(pf_req);
if (pf_block + pf_count > get_capacity(pf_req->rq_disk)) {
pf_end_request(-EIO);
@@ -810,7 +810,7 @@ static int pf_next_buf(void)
spin_unlock_irqrestore(&pf_spin_lock, saved_flags);
if (!pf_req)
return 1;
- pf_count = pf_req->current_nr_sectors;
+ pf_count = blk_rq_cur_sectors(pf_req);
pf_buf = pf_req->buffer;
}
return 0;
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index c238867..8d58308 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -134,13 +134,12 @@ static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
rq_for_each_segment(bv, req, iter)
n++;
dev_dbg(&dev->sbd.core,
- "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
- __func__, __LINE__, op, n, req->nr_sectors,
- blk_rq_sectors(req));
+ "%s:%u: %s req has %u bvecs for %u sectors\n",
+ __func__, __LINE__, op, n, blk_rq_sectors(req));
#endif
- start_sector = req->sector * priv->blocking_factor;
- sectors = req->nr_sectors * priv->blocking_factor;
+ start_sector = blk_rq_pos(req) * priv->blocking_factor;
+ sectors = blk_rq_sectors(req) * priv->blocking_factor;
dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
__func__, __LINE__, op, sectors, start_sector);
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index f59887c..9f351bf 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -416,7 +416,7 @@ static int __send_request(struct request *req)
desc->slice = 0;
}
desc->status = ~0;
- desc->offset = (req->sector << 9) / port->vdisk_block_size;
+ desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
desc->size = len;
desc->ncookies = err;
diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 4248559..c1b9a4d 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -312,14 +312,14 @@ static void start_request(struct floppy_state *fs)
}
while (fs->state == idle && (req = elv_next_request(swim3_queue))) {
#if 0
- printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%ld buf=%p\n",
+ printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",
req->rq_disk->disk_name, req->cmd,
- (long)req->sector, req->nr_sectors, req->buffer);
- printk(" errors=%d current_nr_sectors=%ld\n",
- req->errors, req->current_nr_sectors);
+ (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
+ printk(" errors=%d current_nr_sectors=%u\n",
+ req->errors, blk_rq_cur_sectors(req));
#endif
- if (req->sector >= fs->total_secs) {
+ if (blk_rq_pos(req) >= fs->total_secs) {
__blk_end_request_cur(req, -EIO);
continue;
}
@@ -337,13 +337,14 @@ static void start_request(struct floppy_state *fs)
}
}
- /* Do not remove the cast. req->sector is now a sector_t and
- * can be 64 bits, but it will never go past 32 bits for this
- * driver anyway, so we can safely cast it down and not have
- * to do a 64/32 division
+ /* Do not remove the cast. blk_rq_pos(req) is now a
+ * sector_t and can be 64 bits, but it will never go
+ * past 32 bits for this driver anyway, so we can
+ * safely cast it down and not have to do a 64/32
+ * division
*/
- fs->req_cyl = ((long)req->sector) / fs->secpercyl;
- x = ((long)req->sector) % fs->secpercyl;
+ fs->req_cyl = ((long)blk_rq_pos(req)) / fs->secpercyl;
+ x = ((long)blk_rq_pos(req)) % fs->secpercyl;
fs->head = x / fs->secpertrack;
fs->req_sector = x % fs->secpertrack + 1;
fd_req = req;
@@ -420,7 +421,7 @@ static inline void setup_transfer(struct floppy_state *fs)
struct dbdma_cmd *cp = fs->dma_cmd;
struct dbdma_regs __iomem *dr = fs->dma;
- if (fd_req->current_nr_sectors <= 0) {
+ if (blk_rq_cur_sectors(fd_req) <= 0) {
printk(KERN_ERR "swim3: transfer 0 sectors?\n");
return;
}
@@ -428,8 +429,8 @@ static inline void setup_transfer(struct floppy_state *fs)
n = 1;
else {
n = fs->secpertrack - fs->req_sector + 1;
- if (n > fd_req->current_nr_sectors)
- n = fd_req->current_nr_sectors;
+ if (n > blk_rq_cur_sectors(fd_req))
+ n = blk_rq_cur_sectors(fd_req);
}
fs->scount = n;
swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);
@@ -600,7 +601,8 @@ static void xfer_timeout(unsigned long data)
out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);
out_8(&sw->select, RELAX);
printk(KERN_ERR "swim3: timeout %sing sector %ld\n",
- (rq_data_dir(fd_req)==WRITE? "writ": "read"), (long)fd_req->sector);
+ (rq_data_dir(fd_req)==WRITE? "writ": "read"),
+ (long)blk_rq_pos(fd_req));
__blk_end_request_cur(fd_req, -EIO);
fs->state = idle;
start_request(fs);
@@ -714,7 +716,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id)
} else {
printk("swim3: error %sing block %ld (err=%x)\n",
rq_data_dir(fd_req) == WRITE? "writ": "read",
- (long)fd_req->sector, err);
+ (long)blk_rq_pos(fd_req), err);
__blk_end_request_cur(fd_req, -EIO);
fs->state = idle;
}
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 60e85bb..087c94c 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -903,10 +903,10 @@ queue_one_request:
msg->sg_count = n_elem;
msg->sg_type = SGT_32BIT;
msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
- msg->lba = cpu_to_le32(rq->sector & 0xffffffff);
- tmp = (rq->sector >> 16) >> 16;
+ msg->lba = cpu_to_le32(blk_rq_pos(rq) & 0xffffffff);
+ tmp = (blk_rq_pos(rq) >> 16) >> 16;
msg->lba_high = cpu_to_le16( (u16) tmp );
- msg->lba_count = cpu_to_le16(rq->nr_sectors);
+ msg->lba_count = cpu_to_le16(blk_rq_sectors(rq));
msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
for (i = 0; i < n_elem; i++) {
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 8c2cc71..dc3b899 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -726,8 +726,8 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
* The call to blk_queue_hardsect_size() guarantees that request
* is aligned, but it is given in terms of 512 byte units, always.
*/
- block = rq->sector >> lun->capacity.bshift;
- nblks = rq->nr_sectors >> lun->capacity.bshift;
+ block = blk_rq_pos(rq) >> lun->capacity.bshift;
+ nblks = blk_rq_sectors(rq) >> lun->capacity.bshift;
cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10;
/* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
@@ -739,7 +739,7 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
cmd->cdb[8] = nblks;
cmd->cdb_len = 10;
- cmd->len = rq->nr_sectors * 512;
+ cmd->len = blk_rq_sectors(rq) * 512;
}
static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
index e821eed..2086cb1 100644
--- a/drivers/block/viodasd.c
+++ b/drivers/block/viodasd.c
@@ -252,7 +252,7 @@ static int send_request(struct request *req)
struct viodasd_device *d;
unsigned long flags;
- start = (u64)req->sector << 9;
+ start = (u64)blk_rq_pos(req) << 9;
if (rq_data_dir(req) == READ) {
direction = DMA_FROM_DEVICE;
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 50745e6..1980ab4 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -85,7 +85,7 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
vbr->req = req;
if (blk_fs_request(vbr->req)) {
vbr->out_hdr.type = 0;
- vbr->out_hdr.sector = vbr->req->sector;
+ vbr->out_hdr.sector = blk_rq_pos(vbr->req);
vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
} else if (blk_pc_request(vbr->req)) {
vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index 14be4c1..4ef8801 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -306,8 +306,8 @@ static void do_xd_request (struct request_queue * q)
return;
while ((req = elv_next_request(q)) != NULL) {
- unsigned block = req->sector;
- unsigned count = req->nr_sectors;
+ unsigned block = blk_rq_pos(req);
+ unsigned count = blk_rq_sectors(req);
XD_INFO *disk = req->rq_disk->private_data;
int res = 0;
int retry;
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index b456447..91fc565 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -231,7 +231,7 @@ static int blkif_queue_request(struct request *req)
info->shadow[id].request = (unsigned long)req;
ring_req->id = id;
- ring_req->sector_number = (blkif_sector_t)req->sector;
+ ring_req->sector_number = (blkif_sector_t)blk_rq_pos(req);
ring_req->handle = info->handle;
ring_req->operation = rq_data_dir(req) ?
@@ -310,11 +310,10 @@ static void do_blkif_request(struct request_queue *rq)
goto wait;
pr_debug("do_blk_req %p: cmd %p, sec %lx, "
- "(%u/%li) buffer:%p [%s]\n",
- req, req->cmd, (unsigned long)req->sector,
- req->current_nr_sectors,
- req->nr_sectors, req->buffer,
- rq_data_dir(req) ? "write" : "read");
+ "(%u/%u) buffer:%p [%s]\n",
+ req, req->cmd, (unsigned long)blk_rq_pos(req),
+ blk_rq_cur_sectors(req), blk_rq_sectors(req),
+ req->buffer, rq_data_dir(req) ? "write" : "read");
blkdev_dequeue_request(req);
diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
index 5722931..97c99b4 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -646,13 +646,14 @@ static void ace_fsm_dostate(struct ace_device *ace)
/* Okay, it's a data request, set it up for transfer */
dev_dbg(ace->dev,
"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
- (unsigned long long) req->sector, blk_rq_sectors(req),
- req->current_nr_sectors, rq_data_dir(req));
+ (unsigned long long)blk_rq_pos(req),
+ blk_rq_sectors(req), blk_rq_cur_sectors(req),
+ rq_data_dir(req));
ace->req = req;
ace->data_ptr = req->buffer;
- ace->data_count = req->current_nr_sectors * ACE_BUF_PER_SECTOR;
- ace_out32(ace, ACE_MPULBA, req->sector & 0x0FFFFFFF);
+ ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
+ ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
count = blk_rq_sectors(req);
if (rq_data_dir(req)) {
@@ -688,7 +689,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
dev_dbg(ace->dev,
"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
- ace->req->current_nr_sectors * 16,
+ blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yield(ace); /* need to poll CFBSY bit */
break;
@@ -697,7 +698,7 @@ static void ace_fsm_dostate(struct ace_device *ace)
dev_dbg(ace->dev,
"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
- ace->req->current_nr_sectors * 16,
+ blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yieldirq(ace);
break;
@@ -721,10 +722,10 @@ static void ace_fsm_dostate(struct ace_device *ace)
blk_rq_cur_bytes(ace->req))) {
/* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
* blk_rq_sectors(ace->req),
- * ace->req->current_nr_sectors);
+ * blk_rq_cur_sectors(ace->req));
*/
ace->data_ptr = ace->req->buffer;
- ace->data_count = ace->req->current_nr_sectors * 16;
+ ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
ace_fsm_yieldirq(ace);
break;
}
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index b66ad58..d4e6b71 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -71,12 +71,12 @@ static void do_z2_request(struct request_queue *q)
{
struct request *req;
while ((req = elv_next_request(q)) != NULL) {
- unsigned long start = req->sector << 9;
- unsigned long len = req->current_nr_sectors << 9;
+ unsigned long start = blk_rq_pos(req) << 9;
+ unsigned long len = blk_rq_cur_sectors(req) << 9;
if (start + len > z2ram_size) {
printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
- req->sector, req->current_nr_sectors);
+ blk_rq_pos(req), blk_rq_cur_sectors(req));
__blk_end_request_cur(req, -EIO);
continue;
}
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index cab2b1f..488423c 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -584,8 +584,8 @@ static void gdrom_readdisk_dma(struct work_struct *work)
list_for_each_safe(elem, next, &gdrom_deferred) {
req = list_entry(elem, struct request, queuelist);
spin_unlock(&gdrom_lock);
- block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
- block_cnt = req->nr_sectors/GD_TO_BLK;
+ block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
@@ -661,7 +661,7 @@ static void gdrom_request(struct request_queue *rq)
printk(" write request ignored\n");
__blk_end_request_cur(req, -EIO);
}
- if (req->nr_sectors)
+ if (blk_rq_sectors(req))
gdrom_request_handler_dma(req);
else
__blk_end_request_cur(req, -EIO);
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index cc3efa0..6e190a9 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -282,7 +282,7 @@ static int send_request(struct request *req)
viopath_targetinst(viopath_hostLp),
(u64)req, VIOVERSION << 16,
((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
- (u64)req->sector * 512, len, 0);
+ (u64)blk_rq_pos(req) * 512, len, 0);
if (hvrc != HvLpEvent_Rc_Good) {
printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
return -1;
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index a416346..9e600d2 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -677,10 +677,10 @@ try_again:
continue;
}
- t_sec = msb->block_req->sector << 9;
+ t_sec = blk_rq_pos(msb->block_req) << 9;
sector_div(t_sec, msb->page_size);
- count = msb->block_req->nr_sectors << 9;
+ count = blk_rq_sectors(msb->block_req) << 9;
count /= msb->page_size;
param.system = msb->system;
@@ -745,7 +745,7 @@ static int mspro_block_complete_req(struct memstick_dev *card, int error)
t_len *= msb->page_size;
}
} else
- t_len = msb->block_req->nr_sectors << 9;
+ t_len = blk_rq_sectors(msb->block_req) << 9;
dev_dbg(&card->dev, "transferred %x (%d)\n", t_len, error);
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 56e60f0..510eb47 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -761,7 +761,7 @@ static int i2o_block_transfer(struct request *req)
break;
case CACHE_SMARTFETCH:
- if (req->nr_sectors > 16)
+ if (blk_rq_sectors(req) > 16)
ctl_flags = 0x201F0008;
else
ctl_flags = 0x001F0000;
@@ -781,13 +781,13 @@ static int i2o_block_transfer(struct request *req)
ctl_flags = 0x001F0010;
break;
case CACHE_SMARTBACK:
- if (req->nr_sectors > 16)
+ if (blk_rq_sectors(req) > 16)
ctl_flags = 0x001F0004;
else
ctl_flags = 0x001F0010;
break;
case CACHE_SMARTTHROUGH:
- if (req->nr_sectors > 16)
+ if (blk_rq_sectors(req) > 16)
ctl_flags = 0x001F0004;
else
ctl_flags = 0x001F0010;
@@ -827,22 +827,24 @@ static int i2o_block_transfer(struct request *req)
*mptr++ = cpu_to_le32(scsi_flags);
- *((u32 *) & cmd[2]) = cpu_to_be32(req->sector * hwsec);
- *((u16 *) & cmd[7]) = cpu_to_be16(req->nr_sectors * hwsec);
+ *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec);
+ *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec);
memcpy(mptr, cmd, 10);
mptr += 4;
- *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT);
+ *mptr++ =
+ cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
} else
#endif
{
msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
*mptr++ = cpu_to_le32(ctl_flags);
- *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT);
*mptr++ =
- cpu_to_le32((u32) (req->sector << KERNEL_SECTOR_SHIFT));
+ cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
+ *mptr++ =
+ cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT));
*mptr++ =
- cpu_to_le32(req->sector >> (32 - KERNEL_SECTOR_SHIFT));
+ cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT));
}
if (!i2o_block_sglist_alloc(c, ireq, &mptr)) {
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index fe8041e..949e997 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -243,7 +243,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.mrq.cmd = &brq.cmd;
brq.mrq.data = &brq.data;
- brq.cmd.arg = req->sector;
+ brq.cmd.arg = blk_rq_pos(req);
if (!mmc_card_blockaddr(card))
brq.cmd.arg <<= 9;
brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
@@ -251,7 +251,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.stop.opcode = MMC_STOP_TRANSMISSION;
brq.stop.arg = 0;
brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
- brq.data.blocks = req->nr_sectors;
+ brq.data.blocks = blk_rq_sectors(req);
/*
* After a read error, we redo the request one sector at a time
@@ -293,7 +293,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
* Adjust the sg list so it is the same size as the
* request.
*/
- if (brq.data.blocks != req->nr_sectors) {
+ if (brq.data.blocks != blk_rq_sectors(req)) {
int i, data_size = brq.data.blocks << 9;
struct scatterlist *sg;
@@ -344,8 +344,8 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
printk(KERN_ERR "%s: error %d transferring data,"
" sector %u, nr %u, card status %#x\n",
req->rq_disk->disk_name, brq.data.error,
- (unsigned)req->sector,
- (unsigned)req->nr_sectors, status);
+ (unsigned)blk_rq_pos(req),
+ (unsigned)blk_rq_sectors(req), status);
}
if (brq.stop.error) {
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 76c4c8d..4ea2e67 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -47,8 +47,8 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
unsigned long block, nsect;
char *buf;
- block = req->sector << 9 >> tr->blkshift;
- nsect = req->current_nr_sectors << 9 >> tr->blkshift;
+ block = blk_rq_pos(req) << 9 >> tr->blkshift;
+ nsect = blk_rq_cur_sectors(req) << 9 >> tr->blkshift;
buf = req->buffer;
@@ -59,7 +59,8 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
if (!blk_fs_request(req))
return -EIO;
- if (req->sector + req->current_nr_sectors > get_capacity(req->rq_disk))
+ if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
+ get_capacity(req->rq_disk))
return -EIO;
switch(rq_data_dir(req)) {
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index fabec95..7df03c7 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -603,7 +603,7 @@ static void dasd_profile_end(struct dasd_block *block,
if (dasd_profile_level != DASD_PROFILE_ON)
return;
- sectors = req->nr_sectors;
+ sectors = blk_rq_sectors(req);
if (!cqr->buildclk || !cqr->startclk ||
!cqr->stopclk || !cqr->endclk ||
!sectors)
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index b9a7f77..2efaddf 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -505,8 +505,9 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
return ERR_PTR(-EINVAL);
blksize = block->bp_block;
/* Calculate record id of first and last block. */
- first_rec = req->sector >> block->s2b_shift;
- last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
+ first_rec = blk_rq_pos(req) >> block->s2b_shift;
+ last_rec =
+ (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
/* Check struct bio and count the number of blocks for the request. */
count = 0;
rq_for_each_segment(bv, req, iter) {
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index cb52da0..a41c940 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2354,10 +2354,10 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
blksize = block->bp_block;
blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
/* Calculate record id of first and last block. */
- first_rec = first_trk = req->sector >> block->s2b_shift;
+ first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
first_offs = sector_div(first_trk, blk_per_trk);
last_rec = last_trk =
- (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
+ (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
last_offs = sector_div(last_trk, blk_per_trk);
cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
@@ -2420,7 +2420,7 @@ dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
private = (struct dasd_eckd_private *) cqr->block->base->private;
blksize = cqr->block->bp_block;
blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
- recid = req->sector >> cqr->block->s2b_shift;
+ recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
ccw = cqr->cpaddr;
/* Skip over define extent & locate record. */
ccw++;
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index a3eb6fd..8912358 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -270,8 +270,9 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
return ERR_PTR(-EINVAL);
blksize = block->bp_block;
/* Calculate record id of first and last block. */
- first_rec = req->sector >> block->s2b_shift;
- last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
+ first_rec = blk_rq_pos(req) >> block->s2b_shift;
+ last_rec =
+ (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
/* Check struct bio and count the number of blocks for the request. */
count = 0;
cidaw = 0;
@@ -309,7 +310,7 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
ccw = cqr->cpaddr;
/* First ccw is define extent. */
define_extent(ccw++, cqr->data, rq_data_dir(req),
- block->bp_block, req->sector, req->nr_sectors);
+ block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
/* Build locate_record + read/write ccws. */
idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
LO_data = (struct LO_fba_data *) (idaws + cidaw);
diff --git a/drivers/s390/char/tape_34xx.c b/drivers/s390/char/tape_34xx.c
index 5f8e8ef..2d00a38 100644
--- a/drivers/s390/char/tape_34xx.c
+++ b/drivers/s390/char/tape_34xx.c
@@ -1134,7 +1134,7 @@ tape_34xx_bread(struct tape_device *device, struct request *req)
/* Setup ccws. */
request->op = TO_BLOCK;
start_block = (struct tape_34xx_block_id *) request->cpdata;
- start_block->block = req->sector >> TAPEBLOCK_HSEC_S2B;
+ start_block->block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B;
DBF_EVENT(6, "start_block = %i\n", start_block->block);
ccw = request->cpaddr;
diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c
index 823b05b..c453b2f 100644
--- a/drivers/s390/char/tape_3590.c
+++ b/drivers/s390/char/tape_3590.c
@@ -633,7 +633,7 @@ tape_3590_bread(struct tape_device *device, struct request *req)
struct req_iterator iter;
DBF_EVENT(6, "xBREDid:");
- start_block = req->sector >> TAPEBLOCK_HSEC_S2B;
+ start_block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B;
DBF_EVENT(6, "start_block = %i\n", start_block);
rq_for_each_segment(bv, req, iter)
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index 86596d3..5d035e4 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -87,7 +87,7 @@ __tapeblock_end_request(struct tape_request *ccw_req, void *data)
if (ccw_req->rc == 0)
/* Update position. */
device->blk_data.block_position =
- (req->sector + req->nr_sectors) >> TAPEBLOCK_HSEC_S2B;
+ (blk_rq_pos(req) + blk_rq_sectors(req)) >> TAPEBLOCK_HSEC_S2B;
else
/* We lost the position information due to an error. */
device->blk_data.block_position = -1;
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index 0961788..2132c90 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -188,8 +188,8 @@ static void jsfd_do_request(struct request_queue *q)
while ((req = elv_next_request(q)) != NULL) {
struct jsfd_part *jdp = req->rq_disk->private_data;
- unsigned long offset = req->sector << 9;
- size_t len = req->current_nr_sectors << 9;
+ unsigned long offset = blk_rq_pos(req) << 9;
+ size_t len = blk_rq_cur_sectors(req) << 9;
if ((offset + len) > jdp->dsize) {
__blk_end_request_cur(req, -EIO);
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index be5099d..c7076ce 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1825,7 +1825,7 @@ static int eata2x_queuecommand(struct scsi_cmnd *SCpnt,
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type)) {
ha->cp_stat[i] = READY;
- flush_dev(SCpnt->device, SCpnt->request->sector, ha, 0);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), ha, 0);
return 0;
}
@@ -2144,13 +2144,13 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
if (!cpp->din)
input_only = 0;
- if (SCpnt->request->sector < minsec)
- minsec = SCpnt->request->sector;
- if (SCpnt->request->sector > maxsec)
- maxsec = SCpnt->request->sector;
+ if (blk_rq_pos(SCpnt->request) < minsec)
+ minsec = blk_rq_pos(SCpnt->request);
+ if (blk_rq_pos(SCpnt->request) > maxsec)
+ maxsec = blk_rq_pos(SCpnt->request);
- sl[n] = SCpnt->request->sector;
- ioseek += SCpnt->request->nr_sectors;
+ sl[n] = blk_rq_pos(SCpnt->request);
+ ioseek += blk_rq_sectors(SCpnt->request);
if (!n)
continue;
@@ -2190,7 +2190,7 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
k = il[n];
cpp = &ha->cp[k];
SCpnt = cpp->SCpnt;
- ll[n] = SCpnt->request->nr_sectors;
+ ll[n] = blk_rq_sectors(SCpnt->request);
pl[n] = SCpnt->serial_number;
if (!n)
@@ -2236,12 +2236,12 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
cpp = &ha->cp[k];
SCpnt = cpp->SCpnt;
scmd_printk(KERN_INFO, SCpnt,
- "%s pid %ld mb %d fc %d nr %d sec %ld ns %ld"
+ "%s pid %ld mb %d fc %d nr %d sec %ld ns %u"
" cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
(ihdlr ? "ihdlr" : "qcomm"),
SCpnt->serial_number, k, flushcount,
- n_ready, SCpnt->request->sector,
- SCpnt->request->nr_sectors, cursec, YESNO(s),
+ n_ready, blk_rq_pos(SCpnt->request),
+ blk_rq_sectors(SCpnt->request), cursec, YESNO(s),
YESNO(r), YESNO(rev), YESNO(input_only),
YESNO(overlap), cpp->din);
}
@@ -2408,7 +2408,7 @@ static irqreturn_t ihdlr(struct Scsi_Host *shost)
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type))
- flush_dev(SCpnt->device, SCpnt->request->sector, ha, 1);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), ha, 1);
tstatus = status_byte(spp->target_status);
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 36fd2e7..a8fab39 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -1313,10 +1313,10 @@ lpfc_parse_bg_err(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd,
uint32_t bgstat = bgf->bgstat;
uint64_t failing_sector = 0;
- printk(KERN_ERR "BG ERROR in cmd 0x%x lba 0x%llx blk cnt 0x%lx "
+ printk(KERN_ERR "BG ERROR in cmd 0x%x lba 0x%llx blk cnt 0x%x "
"bgstat=0x%x bghm=0x%x\n",
cmd->cmnd[0], (unsigned long long)scsi_get_lba(cmd),
- cmd->request->nr_sectors, bgstat, bghm);
+ blk_rq_sectors(cmd->request), bgstat, bghm);
spin_lock(&_dump_buf_lock);
if (!_dump_buf_done) {
@@ -2375,15 +2375,15 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
if (cmnd->cmnd[0] == READ_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9035 BLKGRD: READ @ sector %llu, "
- "count %lu\n",
- (unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors);
+ "count %u\n",
+ (unsigned long long)scsi_get_lba(cmnd),
+ blk_rq_sectors(cmnd->request));
else if (cmnd->cmnd[0] == WRITE_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9036 BLKGRD: WRITE @ sector %llu, "
- "count %lu cmd=%p\n",
+ "count %u cmd=%p\n",
(unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors,
+ blk_rq_sectors(cmnd->request),
cmnd);
err = lpfc_bg_scsi_prep_dma_buf(phba, lpfc_cmd);
@@ -2403,15 +2403,15 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
if (cmnd->cmnd[0] == READ_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9040 dbg: READ @ sector %llu, "
- "count %lu\n",
+ "count %u\n",
(unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors);
+ blk_rq_sectors(cmnd->request));
else if (cmnd->cmnd[0] == WRITE_10)
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9041 dbg: WRITE @ sector %llu, "
- "count %lu cmd=%p\n",
+ "count %u cmd=%p\n",
(unsigned long long)scsi_get_lba(cmnd),
- cmnd->request->nr_sectors, cmnd);
+ blk_rq_sectors(cmnd->request), cmnd);
else
lpfc_printf_vlog(vport, KERN_WARNING, LOG_BG,
"9042 dbg: parser not implemented\n");
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9ff0ca9..39b3acf 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -787,9 +787,9 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
* Next deal with any sectors which we were able to correctly
* handle.
*/
- SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, "
+ SCSI_LOG_HLCOMPLETE(1, printk("%u sectors total, "
"%d bytes done.\n",
- req->nr_sectors, good_bytes));
+ blk_rq_sectors(req), good_bytes));
/*
* Recovered errors need reporting, but they're always treated
@@ -968,7 +968,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
if (blk_pc_request(req))
sdb->length = req->data_len;
else
- sdb->length = req->nr_sectors << 9;
+ sdb->length = blk_rq_sectors(req) << 9;
return BLKPREP_OK;
}
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3fcb64b..70c4dd9 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -383,9 +383,9 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
struct scsi_device *sdp = q->queuedata;
struct gendisk *disk = rq->rq_disk;
struct scsi_disk *sdkp;
- sector_t block = rq->sector;
+ sector_t block = blk_rq_pos(rq);
sector_t threshold;
- unsigned int this_count = rq->nr_sectors;
+ unsigned int this_count = blk_rq_sectors(rq);
int ret, host_dif;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
@@ -412,10 +412,10 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
this_count));
if (!sdp || !scsi_device_online(sdp) ||
- block + rq->nr_sectors > get_capacity(disk)) {
+ block + blk_rq_sectors(rq) > get_capacity(disk)) {
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
- "Finishing %ld sectors\n",
- rq->nr_sectors));
+ "Finishing %u sectors\n",
+ blk_rq_sectors(rq)));
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
"Retry with 0x%p\n", SCpnt));
goto out;
@@ -462,7 +462,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
* for this.
*/
if (sdp->sector_size == 1024) {
- if ((block & 1) || (rq->nr_sectors & 1)) {
+ if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
scmd_printk(KERN_ERR, SCpnt,
"Bad block number requested\n");
goto out;
@@ -472,7 +472,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
}
}
if (sdp->sector_size == 2048) {
- if ((block & 3) || (rq->nr_sectors & 3)) {
+ if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
scmd_printk(KERN_ERR, SCpnt,
"Bad block number requested\n");
goto out;
@@ -482,7 +482,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
}
}
if (sdp->sector_size == 4096) {
- if ((block & 7) || (rq->nr_sectors & 7)) {
+ if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
scmd_printk(KERN_ERR, SCpnt,
"Bad block number requested\n");
goto out;
@@ -511,10 +511,10 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
}
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
- "%s %d/%ld 512 byte blocks.\n",
+ "%s %d/%u 512 byte blocks.\n",
(rq_data_dir(rq) == WRITE) ?
"writing" : "reading", this_count,
- rq->nr_sectors));
+ blk_rq_sectors(rq)));
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
@@ -970,8 +970,8 @@ static struct block_device_operations sd_fops = {
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
{
- u64 start_lba = scmd->request->sector;
- u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
+ u64 start_lba = blk_rq_pos(scmd->request);
+ u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
u64 bad_lba;
int info_valid;
diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 184dff4..82f14a9 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -507,7 +507,7 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
sector_sz = scmd->device->sector_size;
sectors = good_bytes / sector_sz;
- phys = scmd->request->sector & 0xffffffff;
+ phys = blk_rq_pos(scmd->request) & 0xffffffff;
if (sector_sz == 4096)
phys >>= 3;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 0e1a0f2..fddba53 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -292,7 +292,8 @@ static int sr_done(struct scsi_cmnd *SCpnt)
if (cd->device->sector_size == 2048)
error_sector <<= 2;
error_sector &= ~(block_sectors - 1);
- good_bytes = (error_sector - SCpnt->request->sector) << 9;
+ good_bytes = (error_sector -
+ blk_rq_pos(SCpnt->request)) << 9;
if (good_bytes < 0 || good_bytes >= this_count)
good_bytes = 0;
/*
@@ -349,8 +350,8 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
cd->disk->disk_name, block));
if (!cd->device || !scsi_device_online(cd->device)) {
- SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n",
- rq->nr_sectors));
+ SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n",
+ blk_rq_sectors(rq)));
SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt));
goto out;
}
@@ -413,7 +414,7 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
/*
* request doesn't start on hw block boundary, add scatter pads
*/
- if (((unsigned int)rq->sector % (s_size >> 9)) ||
+ if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||
(scsi_bufflen(SCpnt) % s_size)) {
scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
goto out;
@@ -422,14 +423,14 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
- SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
+ SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n",
cd->cdi.name,
(rq_data_dir(rq) == WRITE) ?
"writing" : "reading",
- this_count, rq->nr_sectors));
+ this_count, blk_rq_sectors(rq)));
SCpnt->cmnd[1] = 0;
- block = (unsigned int)rq->sector / (s_size >> 9);
+ block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);
if (this_count > 0xffff) {
this_count = 0xffff;
diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c
index 601e951..54023d4 100644
--- a/drivers/scsi/u14-34f.c
+++ b/drivers/scsi/u14-34f.c
@@ -1306,7 +1306,7 @@ static int u14_34f_queuecommand(struct scsi_cmnd *SCpnt, void (*done)(struct scs
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type)) {
HD(j)->cp_stat[i] = READY;
- flush_dev(SCpnt->device, SCpnt->request->sector, j, FALSE);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), j, FALSE);
return 0;
}
@@ -1610,11 +1610,13 @@ static int reorder(unsigned int j, unsigned long cursec,
if (!(cpp->xdir == DTD_IN)) input_only = FALSE;
- if (SCpnt->request->sector < minsec) minsec = SCpnt->request->sector;
- if (SCpnt->request->sector > maxsec) maxsec = SCpnt->request->sector;
+ if (blk_rq_pos(SCpnt->request) < minsec)
+ minsec = blk_rq_pos(SCpnt->request);
+ if (blk_rq_pos(SCpnt->request) > maxsec)
+ maxsec = blk_rq_pos(SCpnt->request);
- sl[n] = SCpnt->request->sector;
- ioseek += SCpnt->request->nr_sectors;
+ sl[n] = blk_rq_pos(SCpnt->request);
+ ioseek += blk_rq_sectors(SCpnt->request);
if (!n) continue;
@@ -1642,7 +1644,7 @@ static int reorder(unsigned int j, unsigned long cursec,
if (!input_only) for (n = 0; n < n_ready; n++) {
k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
- ll[n] = SCpnt->request->nr_sectors; pl[n] = SCpnt->serial_number;
+ ll[n] = blk_rq_sectors(SCpnt->request); pl[n] = SCpnt->serial_number;
if (!n) continue;
@@ -1666,12 +1668,12 @@ static int reorder(unsigned int j, unsigned long cursec,
if (link_statistics && (overlap || !(flushcount % link_statistics)))
for (n = 0; n < n_ready; n++) {
k = il[n]; cpp = &HD(j)->cp[k]; SCpnt = cpp->SCpnt;
- printk("%s %d.%d:%d pid %ld mb %d fc %d nr %d sec %ld ns %ld"\
+ printk("%s %d.%d:%d pid %ld mb %d fc %d nr %d sec %ld ns %u"\
" cur %ld s:%c r:%c rev:%c in:%c ov:%c xd %d.\n",
(ihdlr ? "ihdlr" : "qcomm"), SCpnt->channel, SCpnt->target,
SCpnt->lun, SCpnt->serial_number, k, flushcount, n_ready,
- SCpnt->request->sector, SCpnt->request->nr_sectors, cursec,
- YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
+ blk_rq_pos(SCpnt->request), blk_rq_sectors(SCpnt->request),
+ cursec, YESNO(s), YESNO(r), YESNO(rev), YESNO(input_only),
YESNO(overlap), cpp->xdir);
}
#endif
@@ -1799,7 +1801,7 @@ static irqreturn_t ihdlr(unsigned int j)
if (linked_comm && SCpnt->device->queue_depth > 2
&& TLDEV(SCpnt->device->type))
- flush_dev(SCpnt->device, SCpnt->request->sector, j, TRUE);
+ flush_dev(SCpnt->device, blk_rq_pos(SCpnt->request), j, TRUE);
tstatus = status_byte(spp->target_status);
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 43b50d3..3878d1d 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -270,7 +270,7 @@ static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
{
- return scmd->request->sector;
+ return blk_rq_pos(scmd->request);
}
static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 06/11] ide: convert to rq pos and nr_sectors accessors
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
ide doesn't manipulate request fields anymore and thus all hard and
their soft equivalents are always equal. Convert all references to
accessors.
[ Impact: use pos and nr_sectors accessors ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
---
drivers/ide/ide-cd.c | 8 ++++----
drivers/ide/ide-disk.c | 8 ++++----
drivers/ide/ide-dma.c | 2 +-
drivers/ide/ide-floppy.c | 6 +++---
drivers/ide/ide-io.c | 4 ++--
drivers/ide/ide-lib.c | 2 +-
drivers/ide/ide-tape.c | 6 +++---
drivers/ide/ide-taskfile.c | 2 +-
drivers/ide/pdc202xx_old.c | 2 +-
drivers/ide/tc86c001.c | 2 +-
drivers/ide/tx4939ide.c | 2 +-
11 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 474b283..94a341b 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -774,8 +774,8 @@ static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
}
/* fs requests *must* be hardware frame aligned */
- if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
- (rq->sector & (sectors_per_frame - 1)))
+ if ((blk_rq_sectors(rq) & (sectors_per_frame - 1)) ||
+ (blk_rq_pos(rq) & (sectors_per_frame - 1)))
return ide_stopped;
/* use DMA, if possible */
@@ -867,8 +867,8 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
cmd.rq = rq;
if (blk_fs_request(rq) || rq->data_len) {
- ide_init_sg_cmd(&cmd, blk_fs_request(rq) ? (rq->nr_sectors << 9)
- : rq->data_len);
+ ide_init_sg_cmd(&cmd, blk_fs_request(rq) ?
+ (blk_rq_sectors(rq) << 9) : rq->data_len);
ide_map_sg(drive, &cmd);
}
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index c243880..ad18e14 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -82,7 +82,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
sector_t block)
{
ide_hwif_t *hwif = drive->hwif;
- u16 nsectors = (u16)rq->nr_sectors;
+ u16 nsectors = (u16)blk_rq_sectors(rq);
u8 lba48 = !!(drive->dev_flags & IDE_DFLAG_LBA48);
u8 dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
struct ide_cmd cmd;
@@ -90,7 +90,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
ide_startstop_t rc;
if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) {
- if (block + rq->nr_sectors > 1ULL << 28)
+ if (block + blk_rq_sectors(rq) > 1ULL << 28)
dma = 0;
else
lba48 = 0;
@@ -195,9 +195,9 @@ static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
ledtrig_ide_activity();
- pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
+ pr_debug("%s: %sing: block=%llu, sectors=%u, buffer=0x%08lx\n",
drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
- (unsigned long long)block, rq->nr_sectors,
+ (unsigned long long)block, blk_rq_sectors(rq),
(unsigned long)rq->buffer);
if (hwif->rw_disk)
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index d9123ec..001f68f 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -103,7 +103,7 @@ ide_startstop_t ide_dma_intr(ide_drive_t *drive)
ide_finish_cmd(drive, cmd, stat);
else
ide_complete_rq(drive, 0,
- cmd->rq->nr_sectors << 9);
+ blk_rq_sectors(cmd->rq) << 9);
return ide_stopped;
}
printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n",
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 537b7c5..1c460bd 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -194,7 +194,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
{
struct ide_disk_obj *floppy = drive->driver_data;
int block = sector / floppy->bs_factor;
- int blocks = rq->nr_sectors / floppy->bs_factor;
+ int blocks = blk_rq_sectors(rq) / floppy->bs_factor;
int cmd = rq_data_dir(rq);
ide_debug_log(IDE_DBG_FUNC, "block: %d, blocks: %d", block, blocks);
@@ -259,8 +259,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
goto out_end;
}
if (blk_fs_request(rq)) {
- if (((long)rq->sector % floppy->bs_factor) ||
- (rq->nr_sectors % floppy->bs_factor)) {
+ if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
+ (blk_rq_sectors(rq) % floppy->bs_factor)) {
printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
drive->name);
goto out_end;
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index df23bcb..59799ca 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -279,7 +279,7 @@ static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
if (cmd) {
if (cmd->protocol == ATA_PROT_PIO) {
- ide_init_sg_cmd(cmd, rq->nr_sectors << 9);
+ ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9);
ide_map_sg(drive, cmd);
}
@@ -387,7 +387,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
drv = *(struct ide_driver **)rq->rq_disk->private_data;
- return drv->do_request(drive, rq, rq->sector);
+ return drv->do_request(drive, rq, blk_rq_pos(rq));
}
return do_special(drive);
kill_rq:
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 56ff8c4..05b7fbc 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -114,7 +114,7 @@ static void ide_dump_ata_error(ide_drive_t *drive, u8 err)
if (rq)
printk(KERN_CONT ", sector=%llu",
- (unsigned long long)rq->sector);
+ (unsigned long long)blk_rq_pos(rq));
}
printk(KERN_CONT "\n");
}
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 3813a0e..e166045 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -586,7 +586,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
struct ide_atapi_pc *pc, struct request *rq,
u8 opcode)
{
- unsigned int length = rq->nr_sectors;
+ unsigned int length = blk_rq_sectors(rq);
ide_init_pc(pc);
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
@@ -617,8 +617,8 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
struct ide_cmd cmd;
u8 stat;
- debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n"
- (unsigned long long)rq->sector, rq->nr_sectors);
+ debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n"
+ (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq));
if (!(blk_special_request(rq) || blk_sense_request(rq))) {
/* We do not support buffer cache originated requests. */
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index f400eb4..a0c3e1b 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -385,7 +385,7 @@ out_end:
if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
ide_finish_cmd(drive, cmd, stat);
else
- ide_complete_rq(drive, 0, cmd->rq->nr_sectors << 9);
+ ide_complete_rq(drive, 0, blk_rq_sectors(cmd->rq) << 9);
return ide_stopped;
out_err:
ide_error_cmd(drive, cmd);
diff --git a/drivers/ide/pdc202xx_old.c b/drivers/ide/pdc202xx_old.c
index 248a54b..c2a16a8 100644
--- a/drivers/ide/pdc202xx_old.c
+++ b/drivers/ide/pdc202xx_old.c
@@ -177,7 +177,7 @@ static void pdc202xx_dma_start(ide_drive_t *drive)
u8 clock = inb(high_16 + 0x11);
outb(clock | (hwif->channel ? 0x08 : 0x02), high_16 + 0x11);
- word_count = (rq->nr_sectors << 8);
+ word_count = (blk_rq_sectors(rq) << 8);
word_count = (rq_data_dir(rq) == READ) ?
word_count | 0x05000000 :
word_count | 0x06000000;
diff --git a/drivers/ide/tc86c001.c b/drivers/ide/tc86c001.c
index b4cf42d..05a93d6 100644
--- a/drivers/ide/tc86c001.c
+++ b/drivers/ide/tc86c001.c
@@ -112,7 +112,7 @@ static void tc86c001_dma_start(ide_drive_t *drive)
ide_hwif_t *hwif = drive->hwif;
unsigned long sc_base = hwif->config_data;
unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
- unsigned long nsectors = hwif->rq->nr_sectors;
+ unsigned long nsectors = blk_rq_sectors(hwif->rq);
/*
* We have to manually load the sector count and size into
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index 564422d..5ca7622 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -307,7 +307,7 @@ static int tx4939ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
tx4939ide_writew(SECTOR_SIZE / 2, base, drive->dn ?
TX4939IDE_Xfer_Cnt_2 : TX4939IDE_Xfer_Cnt_1);
- tx4939ide_writew(cmd->rq->nr_sectors, base, TX4939IDE_Sec_Cnt);
+ tx4939ide_writew(blk_rq_sectors(cmd->rq), base, TX4939IDE_Sec_Cnt);
return 0;
}
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 06/11] ide: convert to rq pos and nr_sectors accessors
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
ide doesn't manipulate request fields anymore and thus all hard and
their soft equivalents are always equal. Convert all references to
accessors.
[ Impact: use pos and nr_sectors accessors ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
---
drivers/ide/ide-cd.c | 8 ++++----
drivers/ide/ide-disk.c | 8 ++++----
drivers/ide/ide-dma.c | 2 +-
drivers/ide/ide-floppy.c | 6 +++---
drivers/ide/ide-io.c | 4 ++--
drivers/ide/ide-lib.c | 2 +-
drivers/ide/ide-tape.c | 6 +++---
drivers/ide/ide-taskfile.c | 2 +-
drivers/ide/pdc202xx_old.c | 2 +-
drivers/ide/tc86c001.c | 2 +-
drivers/ide/tx4939ide.c | 2 +-
11 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 474b283..94a341b 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -774,8 +774,8 @@ static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
}
/* fs requests *must* be hardware frame aligned */
- if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
- (rq->sector & (sectors_per_frame - 1)))
+ if ((blk_rq_sectors(rq) & (sectors_per_frame - 1)) ||
+ (blk_rq_pos(rq) & (sectors_per_frame - 1)))
return ide_stopped;
/* use DMA, if possible */
@@ -867,8 +867,8 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
cmd.rq = rq;
if (blk_fs_request(rq) || rq->data_len) {
- ide_init_sg_cmd(&cmd, blk_fs_request(rq) ? (rq->nr_sectors << 9)
- : rq->data_len);
+ ide_init_sg_cmd(&cmd, blk_fs_request(rq) ?
+ (blk_rq_sectors(rq) << 9) : rq->data_len);
ide_map_sg(drive, &cmd);
}
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index c243880..ad18e14 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -82,7 +82,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
sector_t block)
{
ide_hwif_t *hwif = drive->hwif;
- u16 nsectors = (u16)rq->nr_sectors;
+ u16 nsectors = (u16)blk_rq_sectors(rq);
u8 lba48 = !!(drive->dev_flags & IDE_DFLAG_LBA48);
u8 dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
struct ide_cmd cmd;
@@ -90,7 +90,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
ide_startstop_t rc;
if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) {
- if (block + rq->nr_sectors > 1ULL << 28)
+ if (block + blk_rq_sectors(rq) > 1ULL << 28)
dma = 0;
else
lba48 = 0;
@@ -195,9 +195,9 @@ static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
ledtrig_ide_activity();
- pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
+ pr_debug("%s: %sing: block=%llu, sectors=%u, buffer=0x%08lx\n",
drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
- (unsigned long long)block, rq->nr_sectors,
+ (unsigned long long)block, blk_rq_sectors(rq),
(unsigned long)rq->buffer);
if (hwif->rw_disk)
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index d9123ec..001f68f 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -103,7 +103,7 @@ ide_startstop_t ide_dma_intr(ide_drive_t *drive)
ide_finish_cmd(drive, cmd, stat);
else
ide_complete_rq(drive, 0,
- cmd->rq->nr_sectors << 9);
+ blk_rq_sectors(cmd->rq) << 9);
return ide_stopped;
}
printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n",
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 537b7c5..1c460bd 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -194,7 +194,7 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
{
struct ide_disk_obj *floppy = drive->driver_data;
int block = sector / floppy->bs_factor;
- int blocks = rq->nr_sectors / floppy->bs_factor;
+ int blocks = blk_rq_sectors(rq) / floppy->bs_factor;
int cmd = rq_data_dir(rq);
ide_debug_log(IDE_DBG_FUNC, "block: %d, blocks: %d", block, blocks);
@@ -259,8 +259,8 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
goto out_end;
}
if (blk_fs_request(rq)) {
- if (((long)rq->sector % floppy->bs_factor) ||
- (rq->nr_sectors % floppy->bs_factor)) {
+ if (((long)blk_rq_pos(rq) % floppy->bs_factor) ||
+ (blk_rq_sectors(rq) % floppy->bs_factor)) {
printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
drive->name);
goto out_end;
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index df23bcb..59799ca 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -279,7 +279,7 @@ static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
if (cmd) {
if (cmd->protocol == ATA_PROT_PIO) {
- ide_init_sg_cmd(cmd, rq->nr_sectors << 9);
+ ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9);
ide_map_sg(drive, cmd);
}
@@ -387,7 +387,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
drv = *(struct ide_driver **)rq->rq_disk->private_data;
- return drv->do_request(drive, rq, rq->sector);
+ return drv->do_request(drive, rq, blk_rq_pos(rq));
}
return do_special(drive);
kill_rq:
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index 56ff8c4..05b7fbc 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -114,7 +114,7 @@ static void ide_dump_ata_error(ide_drive_t *drive, u8 err)
if (rq)
printk(KERN_CONT ", sector=%llu",
- (unsigned long long)rq->sector);
+ (unsigned long long)blk_rq_pos(rq));
}
printk(KERN_CONT "\n");
}
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 3813a0e..e166045 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -586,7 +586,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
struct ide_atapi_pc *pc, struct request *rq,
u8 opcode)
{
- unsigned int length = rq->nr_sectors;
+ unsigned int length = blk_rq_sectors(rq);
ide_init_pc(pc);
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
@@ -617,8 +617,8 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
struct ide_cmd cmd;
u8 stat;
- debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n"
- (unsigned long long)rq->sector, rq->nr_sectors);
+ debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %u\n"
+ (unsigned long long)blk_rq_pos(rq), blk_rq_sectors(rq));
if (!(blk_special_request(rq) || blk_sense_request(rq))) {
/* We do not support buffer cache originated requests. */
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index f400eb4..a0c3e1b 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -385,7 +385,7 @@ out_end:
if ((cmd->tf_flags & IDE_TFLAG_FS) == 0)
ide_finish_cmd(drive, cmd, stat);
else
- ide_complete_rq(drive, 0, cmd->rq->nr_sectors << 9);
+ ide_complete_rq(drive, 0, blk_rq_sectors(cmd->rq) << 9);
return ide_stopped;
out_err:
ide_error_cmd(drive, cmd);
diff --git a/drivers/ide/pdc202xx_old.c b/drivers/ide/pdc202xx_old.c
index 248a54b..c2a16a8 100644
--- a/drivers/ide/pdc202xx_old.c
+++ b/drivers/ide/pdc202xx_old.c
@@ -177,7 +177,7 @@ static void pdc202xx_dma_start(ide_drive_t *drive)
u8 clock = inb(high_16 + 0x11);
outb(clock | (hwif->channel ? 0x08 : 0x02), high_16 + 0x11);
- word_count = (rq->nr_sectors << 8);
+ word_count = (blk_rq_sectors(rq) << 8);
word_count = (rq_data_dir(rq) == READ) ?
word_count | 0x05000000 :
word_count | 0x06000000;
diff --git a/drivers/ide/tc86c001.c b/drivers/ide/tc86c001.c
index b4cf42d..05a93d6 100644
--- a/drivers/ide/tc86c001.c
+++ b/drivers/ide/tc86c001.c
@@ -112,7 +112,7 @@ static void tc86c001_dma_start(ide_drive_t *drive)
ide_hwif_t *hwif = drive->hwif;
unsigned long sc_base = hwif->config_data;
unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
- unsigned long nsectors = hwif->rq->nr_sectors;
+ unsigned long nsectors = blk_rq_sectors(hwif->rq);
/*
* We have to manually load the sector count and size into
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index 564422d..5ca7622 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -307,7 +307,7 @@ static int tx4939ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
tx4939ide_writew(SECTOR_SIZE / 2, base, drive->dn ?
TX4939IDE_Xfer_Cnt_2 : TX4939IDE_Xfer_Cnt_1);
- tx4939ide_writew(cmd->rq->nr_sectors, base, TX4939IDE_Sec_Cnt);
+ tx4939ide_writew(blk_rq_sectors(cmd->rq), base, TX4939IDE_Sec_Cnt);
return 0;
}
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 07/11] block: drop request->hard_* and *nr_sectors
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
struct request has had a few different ways to represent some
properties of a request. ->hard_* represent block layer's view of the
request progress (completion cursor) and the ones without the prefix
are supposed to represent the issue cursor and allowed to be updated
as necessary by the low level drivers. The thing is that as block
layer supports partial completion, the two cursors really aren't
necessary and only cause confusion. In addition, manual management of
request detail from low level drivers is cumbersome and error-prone at
the very least.
Another interesting duplicate fields are rq->[hard_]nr_sectors and
rq->{hard_cur|current}_nr_sectors against rq->data_len and
rq->bio->bi_size. This is more convoluted than the hard_ case.
rq->[hard_]nr_sectors are initialized for requests with bio but
blk_rq_bytes() uses it only for !pc requests. rq->data_len is
initialized for all request but blk_rq_bytes() uses it only for pc
requests. This causes good amount of confusion throughout block layer
and its drivers and determining the request length has been a bit of
black magic which may or may not work depending on circumstances and
what the specific LLD is actually doing.
rq->{hard_cur|current}_nr_sectors represent the number of sectors in
the contiguous data area at the front. This is mainly used by drivers
which transfers data by walking request segment-by-segment. This
value always equals rq->bio->bi_size >> 9. However, data length for
pc requests may not be multiple of 512 bytes and using this field
becomes a bit confusing.
In general, having multiple fields to represent the same property
leads only to confusion and subtle bugs. With recent block low level
driver cleanups, no driver is accessing or manipulating these
duplicate fields directly. Drop all the duplicates. Now rq->sector
means the current sector, rq->data_len the current total length and
rq->bio->bi_size the current segment length. Everything else is
defined in terms of these three and available only through accessors.
* blk_recalc_rq_sectors() is collapsed into blk_update_request() and
now handles pc and fs requests equally other than rq->sector update.
This means that now pc requests can use partial completion too (no
in-kernel user yet tho).
* bio_cur_sectors() is replaced with bio_cur_bytes() as block layer
now uses byte count as the primary data length.
* blk_rq_pos() is now guranteed to be always correct. In-block users
converted.
* blk_rq_bytes() is now guaranteed to be always valid as is
blk_rq_sectors(). In-block users converted.
* blk_rq_sectors() is now guaranteed to equal blk_rq_bytes() >> 9.
More convenient one is used.
* blk_rq_bytes() and blk_rq_cur_bytes() are now inlined and take const
pointer to request.
[ Impact: API cleanup, single way to represent one property of a request ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Boaz Harrosh <bharrosh@panasas.com>
---
block/blk-core.c | 81 +++++++++++++++++-----------------------------
block/blk-merge.c | 36 ++------------------
block/blk.h | 1 -
block/cfq-iosched.c | 10 +++---
include/linux/bio.h | 6 ++--
include/linux/blkdev.h | 37 +++++++++------------
include/linux/elevator.h | 2 +-
kernel/trace/blktrace.c | 16 ++++----
8 files changed, 67 insertions(+), 122 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 82dc206..3596ca7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,7 +127,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
INIT_LIST_HEAD(&rq->timeout_list);
rq->cpu = -1;
rq->q = q;
- rq->sector = rq->hard_sector = (sector_t) -1;
+ rq->sector = (sector_t) -1;
INIT_HLIST_NODE(&rq->hash);
RB_CLEAR_NODE(&rq->rb_node);
rq->cmd = rq->__cmd;
@@ -189,8 +189,7 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
(unsigned long long)blk_rq_pos(rq),
blk_rq_sectors(rq), blk_rq_cur_sectors(rq));
printk(KERN_INFO " bio %p, biotail %p, buffer %p, len %u\n",
- rq->bio, rq->biotail,
- rq->buffer, rq->data_len);
+ rq->bio, rq->biotail, rq->buffer, blk_rq_bytes(rq));
if (blk_pc_request(rq)) {
printk(KERN_INFO " cdb: ");
@@ -1096,7 +1095,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
req->cmd_flags |= REQ_NOIDLE;
req->errors = 0;
- req->hard_sector = req->sector = bio->bi_sector;
+ req->sector = bio->bi_sector;
req->ioprio = bio_prio(bio);
blk_rq_bio_prep(req->q, req, bio);
}
@@ -1113,14 +1112,13 @@ static inline bool queue_should_plug(struct request_queue *q)
static int __make_request(struct request_queue *q, struct bio *bio)
{
struct request *req;
- int el_ret, nr_sectors;
+ int el_ret;
+ unsigned int bytes = bio->bi_size;
const unsigned short prio = bio_prio(bio);
const int sync = bio_sync(bio);
const int unplug = bio_unplug(bio);
int rw_flags;
- nr_sectors = bio_sectors(bio);
-
/*
* low level driver can indicate that it wants pages above a
* certain limit bounced to low memory (ie for highmem, or even
@@ -1145,7 +1143,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
req->biotail->bi_next = bio;
req->biotail = bio;
- req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+ req->data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1171,10 +1169,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
* not touch req->buffer either...
*/
req->buffer = bio_data(bio);
- req->current_nr_sectors = bio_cur_sectors(bio);
- req->hard_cur_sectors = req->current_nr_sectors;
- req->sector = req->hard_sector = bio->bi_sector;
- req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+ req->sector = bio->bi_sector;
+ req->data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1557,7 +1553,7 @@ EXPORT_SYMBOL(submit_bio);
int blk_rq_check_limits(struct request_queue *q, struct request *rq)
{
if (blk_rq_sectors(rq) > q->max_sectors ||
- rq->data_len > q->max_hw_sectors << 9) {
+ blk_rq_bytes(rq) > q->max_hw_sectors << 9) {
printk(KERN_ERR "%s: over max size limit.\n", __func__);
return -EIO;
}
@@ -1675,35 +1671,6 @@ static void blk_account_io_done(struct request *req)
}
}
-/**
- * blk_rq_bytes - Returns bytes left to complete in the entire request
- * @rq: the request being processed
- **/
-unsigned int blk_rq_bytes(struct request *rq)
-{
- if (blk_fs_request(rq))
- return blk_rq_sectors(rq) << 9;
-
- return rq->data_len;
-}
-EXPORT_SYMBOL_GPL(blk_rq_bytes);
-
-/**
- * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
- * @rq: the request being processed
- **/
-unsigned int blk_rq_cur_bytes(struct request *rq)
-{
- if (blk_fs_request(rq))
- return rq->current_nr_sectors << 9;
-
- if (rq->bio)
- return rq->bio->bi_size;
-
- return rq->data_len;
-}
-EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
-
struct request *elv_next_request(struct request_queue *q)
{
struct request *rq;
@@ -1736,7 +1703,7 @@ struct request *elv_next_request(struct request_queue *q)
if (rq->cmd_flags & REQ_DONTPREP)
break;
- if (q->dma_drain_size && rq->data_len) {
+ if (q->dma_drain_size && blk_rq_bytes(rq)) {
/*
* make sure space for the drain appears we
* know we can do this because max_hw_segments
@@ -1759,7 +1726,7 @@ struct request *elv_next_request(struct request_queue *q)
* avoid resource deadlock. REQ_STARTED will
* prevent other fs requests from passing this one.
*/
- if (q->dma_drain_size && rq->data_len &&
+ if (q->dma_drain_size && blk_rq_bytes(rq) &&
!(rq->cmd_flags & REQ_DONTPREP)) {
/*
* remove the space for the drain we added
@@ -1911,8 +1878,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
* can find how many bytes remain in the request
* later.
*/
- req->nr_sectors = req->hard_nr_sectors = 0;
- req->current_nr_sectors = req->hard_cur_sectors = 0;
+ req->data_len = 0;
return false;
}
@@ -1926,8 +1892,25 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
bio_iovec(bio)->bv_len -= nr_bytes;
}
- blk_recalc_rq_sectors(req, total_bytes >> 9);
+ req->data_len -= total_bytes;
+ req->buffer = bio_data(req->bio);
+
+ /* update sector only for requests with clear definition of sector */
+ if (blk_fs_request(req) || blk_discard_rq(req))
+ req->sector += total_bytes >> 9;
+
+ /*
+ * If total number of sectors is less than the first segment
+ * size, something has gone terribly wrong.
+ */
+ if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
+ printk(KERN_ERR "blk: request botched\n");
+ req->data_len = blk_rq_cur_bytes(req);
+ }
+
+ /* recalculate the number of segments */
blk_recalc_rq_segments(req);
+
return true;
}
EXPORT_SYMBOL_GPL(blk_update_request);
@@ -2049,11 +2032,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->buffer = bio_data(bio);
}
- rq->current_nr_sectors = bio_cur_sectors(bio);
- rq->hard_cur_sectors = rq->current_nr_sectors;
- rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
rq->data_len = bio->bi_size;
-
rq->bio = rq->biotail = bio;
if (bio->bi_bdev)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index bf62a87..b8df66a 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -9,35 +9,6 @@
#include "blk.h"
-void blk_recalc_rq_sectors(struct request *rq, int nsect)
-{
- if (blk_fs_request(rq) || blk_discard_rq(rq)) {
- rq->hard_sector += nsect;
- rq->hard_nr_sectors -= nsect;
-
- /*
- * Move the I/O submission pointers ahead if required.
- */
- if ((rq->nr_sectors >= rq->hard_nr_sectors) &&
- (rq->sector <= rq->hard_sector)) {
- rq->sector = rq->hard_sector;
- rq->nr_sectors = rq->hard_nr_sectors;
- rq->hard_cur_sectors = bio_cur_sectors(rq->bio);
- rq->current_nr_sectors = rq->hard_cur_sectors;
- rq->buffer = bio_data(rq->bio);
- }
-
- /*
- * if total number of sectors is less than the first segment
- * size, something has gone terribly wrong
- */
- if (rq->nr_sectors < rq->current_nr_sectors) {
- printk(KERN_ERR "blk: request botched\n");
- rq->nr_sectors = rq->current_nr_sectors;
- }
- }
-}
-
static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
struct bio *bio)
{
@@ -199,8 +170,9 @@ new_segment:
if (unlikely(rq->cmd_flags & REQ_COPY_USER) &&
- (rq->data_len & q->dma_pad_mask)) {
- unsigned int pad_len = (q->dma_pad_mask & ~rq->data_len) + 1;
+ (blk_rq_bytes(rq) & q->dma_pad_mask)) {
+ unsigned int pad_len =
+ (q->dma_pad_mask & ~blk_rq_bytes(rq)) + 1;
sg->length += pad_len;
rq->extra_len += pad_len;
@@ -398,7 +370,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
req->biotail->bi_next = next->bio;
req->biotail = next->biotail;
- req->nr_sectors = req->hard_nr_sectors += next->hard_nr_sectors;
+ req->data_len += blk_rq_bytes(next);
elv_merge_requests(q, req, next);
diff --git a/block/blk.h b/block/blk.h
index 5111559..ab54529 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -101,7 +101,6 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
int attempt_back_merge(struct request_queue *q, struct request *rq);
int attempt_front_merge(struct request_queue *q, struct request *rq);
void blk_recalc_rq_segments(struct request *rq);
-void blk_recalc_rq_sectors(struct request *rq, int nsect);
void blk_queue_congestion_threshold(struct request_queue *q);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index db4d990..99ac430 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -579,9 +579,9 @@ cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root,
* Sort strictly based on sector. Smallest to the left,
* largest to the right.
*/
- if (sector > cfqq->next_rq->sector)
+ if (sector > blk_rq_pos(cfqq->next_rq))
n = &(*p)->rb_right;
- else if (sector < cfqq->next_rq->sector)
+ else if (sector < blk_rq_pos(cfqq->next_rq))
n = &(*p)->rb_left;
else
break;
@@ -611,8 +611,8 @@ static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq)
return;
cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio];
- __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, cfqq->next_rq->sector,
- &parent, &p);
+ __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root,
+ blk_rq_pos(cfqq->next_rq), &parent, &p);
if (!__cfqq) {
rb_link_node(&cfqq->p_node, parent, p);
rb_insert_color(&cfqq->p_node, cfqq->p_root);
@@ -996,7 +996,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
if (cfq_rq_close(cfqd, __cfqq->next_rq))
return __cfqq;
- if (__cfqq->next_rq->sector < sector)
+ if (blk_rq_pos(__cfqq->next_rq) < sector)
node = rb_next(&__cfqq->p_node);
else
node = rb_prev(&__cfqq->p_node);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index f37ca8c..d30ec6f 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -218,12 +218,12 @@ struct bio {
#define bio_sectors(bio) ((bio)->bi_size >> 9)
#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
-static inline unsigned int bio_cur_sectors(struct bio *bio)
+static inline unsigned int bio_cur_bytes(struct bio *bio)
{
if (bio->bi_vcnt)
- return bio_iovec(bio)->bv_len >> 9;
+ return bio_iovec(bio)->bv_len;
else /* dataless requests such as discard */
- return bio->bi_size >> 9;
+ return bio->bi_size;
}
static inline void *bio_data(struct bio *bio)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b921d91..723d22e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -166,19 +166,8 @@ struct request {
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
- /* Maintain bio traversal state for part by part I/O submission.
- * hard_* are block layer internals, no driver should touch them!
- */
-
- sector_t sector; /* next sector to submit */
- sector_t hard_sector; /* next sector to complete */
- unsigned long nr_sectors; /* no. of sectors left to submit */
- unsigned long hard_nr_sectors; /* no. of sectors left to complete */
- /* no. of sectors left to submit in the current segment */
- unsigned int current_nr_sectors;
-
- /* no. of sectors left to complete in the current segment */
- unsigned int hard_cur_sectors;
+ sector_t sector; /* sector cursor */
+ unsigned int data_len; /* total data len, don't access directly */
struct bio *bio;
struct bio *biotail;
@@ -226,7 +215,6 @@ struct request {
unsigned char __cmd[BLK_MAX_CDB];
unsigned char *cmd;
- unsigned int data_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;
unsigned int resid_len; /* residual count */
@@ -841,20 +829,27 @@ extern void blkdev_dequeue_request(struct request *req);
*/
static inline sector_t blk_rq_pos(const struct request *rq)
{
- return rq->hard_sector;
+ return rq->sector;
+}
+
+static inline unsigned int blk_rq_bytes(const struct request *rq)
+{
+ return rq->data_len;
}
-extern unsigned int blk_rq_bytes(struct request *rq);
-extern unsigned int blk_rq_cur_bytes(struct request *rq);
+static inline int blk_rq_cur_bytes(const struct request *rq)
+{
+ return rq->bio ? bio_cur_bytes(rq->bio) : 0;
+}
static inline unsigned int blk_rq_sectors(const struct request *rq)
{
- return rq->hard_nr_sectors;
+ return blk_rq_bytes(rq) >> 9;
}
static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
{
- return rq->hard_cur_sectors;
+ return blk_rq_cur_bytes(rq) >> 9;
}
/*
@@ -929,7 +924,7 @@ static inline void blk_end_request_all(struct request *rq, int error)
*/
static inline bool blk_end_request_cur(struct request *rq, int error)
{
- return blk_end_request(rq, error, rq->hard_cur_sectors << 9);
+ return blk_end_request(rq, error, blk_rq_cur_bytes(rq));
}
/**
@@ -982,7 +977,7 @@ static inline void __blk_end_request_all(struct request *rq, int error)
*/
static inline bool __blk_end_request_cur(struct request *rq, int error)
{
- return __blk_end_request(rq, error, rq->hard_cur_sectors << 9);
+ return __blk_end_request(rq, error, blk_rq_cur_bytes(rq));
}
extern void blk_complete_request(struct request *);
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index c59b769..4e46287 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -171,7 +171,7 @@ enum {
ELV_MQUEUE_MUST,
};
-#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)
+#define rq_end_sector(rq) (blk_rq_pos(rq) + blk_rq_sectors(rq))
#define rb_entry_rq(node) rb_entry((node), struct request, rb_node)
/*
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 42f1c11..5708a14 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -642,12 +642,12 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
if (blk_pc_request(rq)) {
what |= BLK_TC_ACT(BLK_TC_PC);
- __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
- rq->cmd_len, rq->cmd);
+ __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
+ what, rq->errors, rq->cmd_len, rq->cmd);
} else {
what |= BLK_TC_ACT(BLK_TC_FS);
- __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
- rw, what, rq->errors, 0, NULL);
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw,
+ what, rq->errors, 0, NULL);
}
}
@@ -854,11 +854,11 @@ void blk_add_driver_data(struct request_queue *q,
return;
if (blk_pc_request(rq))
- __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
- rq->errors, len, data);
+ __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
+ BLK_TA_DRV_DATA, rq->errors, len, data);
else
- __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
- 0, BLK_TA_DRV_DATA, rq->errors, len, data);
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0,
+ BLK_TA_DRV_DATA, rq->errors, len, data);
}
EXPORT_SYMBOL_GPL(blk_add_driver_data);
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 07/11] block: drop request->hard_* and *nr_sectors
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
struct request has had a few different ways to represent some
properties of a request. ->hard_* represent block layer's view of the
request progress (completion cursor) and the ones without the prefix
are supposed to represent the issue cursor and allowed to be updated
as necessary by the low level drivers. The thing is that as block
layer supports partial completion, the two cursors really aren't
necessary and only cause confusion. In addition, manual management of
request detail from low level drivers is cumbersome and error-prone at
the very least.
Another interesting duplicate fields are rq->[hard_]nr_sectors and
rq->{hard_cur|current}_nr_sectors against rq->data_len and
rq->bio->bi_size. This is more convoluted than the hard_ case.
rq->[hard_]nr_sectors are initialized for requests with bio but
blk_rq_bytes() uses it only for !pc requests. rq->data_len is
initialized for all request but blk_rq_bytes() uses it only for pc
requests. This causes good amount of confusion throughout block layer
and its drivers and determining the request length has been a bit of
black magic which may or may not work depending on circumstances and
what the specific LLD is actually doing.
rq->{hard_cur|current}_nr_sectors represent the number of sectors in
the contiguous data area at the front. This is mainly used by drivers
which transfers data by walking request segment-by-segment. This
value always equals rq->bio->bi_size >> 9. However, data length for
pc requests may not be multiple of 512 bytes and using this field
becomes a bit confusing.
In general, having multiple fields to represent the same property
leads only to confusion and subtle bugs. With recent block low level
driver cleanups, no driver is accessing or manipulating these
duplicate fields directly. Drop all the duplicates. Now rq->sector
means the current sector, rq->data_len the current total length and
rq->bio->bi_size the current segment length. Everything else is
defined in terms of these three and available only through accessors.
* blk_recalc_rq_sectors() is collapsed into blk_update_request() and
now handles pc and fs requests equally other than rq->sector update.
This means that now pc requests can use partial completion too (no
in-kernel user yet tho).
* bio_cur_sectors() is replaced with bio_cur_bytes() as block layer
now uses byte count as the primary data length.
* blk_rq_pos() is now guranteed to be always correct. In-block users
converted.
* blk_rq_bytes() is now guaranteed to be always valid as is
blk_rq_sectors(). In-block users converted.
* blk_rq_sectors() is now guaranteed to equal blk_rq_bytes() >> 9.
More convenient one is used.
* blk_rq_bytes() and blk_rq_cur_bytes() are now inlined and take const
pointer to request.
[ Impact: API cleanup, single way to represent one property of a request ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Boaz Harrosh <bharrosh@panasas.com>
---
block/blk-core.c | 81 +++++++++++++++++-----------------------------
block/blk-merge.c | 36 ++------------------
block/blk.h | 1 -
block/cfq-iosched.c | 10 +++---
include/linux/bio.h | 6 ++--
include/linux/blkdev.h | 37 +++++++++------------
include/linux/elevator.h | 2 +-
kernel/trace/blktrace.c | 16 ++++----
8 files changed, 67 insertions(+), 122 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 82dc206..3596ca7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,7 +127,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
INIT_LIST_HEAD(&rq->timeout_list);
rq->cpu = -1;
rq->q = q;
- rq->sector = rq->hard_sector = (sector_t) -1;
+ rq->sector = (sector_t) -1;
INIT_HLIST_NODE(&rq->hash);
RB_CLEAR_NODE(&rq->rb_node);
rq->cmd = rq->__cmd;
@@ -189,8 +189,7 @@ void blk_dump_rq_flags(struct request *rq, char *msg)
(unsigned long long)blk_rq_pos(rq),
blk_rq_sectors(rq), blk_rq_cur_sectors(rq));
printk(KERN_INFO " bio %p, biotail %p, buffer %p, len %u\n",
- rq->bio, rq->biotail,
- rq->buffer, rq->data_len);
+ rq->bio, rq->biotail, rq->buffer, blk_rq_bytes(rq));
if (blk_pc_request(rq)) {
printk(KERN_INFO " cdb: ");
@@ -1096,7 +1095,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
req->cmd_flags |= REQ_NOIDLE;
req->errors = 0;
- req->hard_sector = req->sector = bio->bi_sector;
+ req->sector = bio->bi_sector;
req->ioprio = bio_prio(bio);
blk_rq_bio_prep(req->q, req, bio);
}
@@ -1113,14 +1112,13 @@ static inline bool queue_should_plug(struct request_queue *q)
static int __make_request(struct request_queue *q, struct bio *bio)
{
struct request *req;
- int el_ret, nr_sectors;
+ int el_ret;
+ unsigned int bytes = bio->bi_size;
const unsigned short prio = bio_prio(bio);
const int sync = bio_sync(bio);
const int unplug = bio_unplug(bio);
int rw_flags;
- nr_sectors = bio_sectors(bio);
-
/*
* low level driver can indicate that it wants pages above a
* certain limit bounced to low memory (ie for highmem, or even
@@ -1145,7 +1143,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
req->biotail->bi_next = bio;
req->biotail = bio;
- req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+ req->data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1171,10 +1169,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
* not touch req->buffer either...
*/
req->buffer = bio_data(bio);
- req->current_nr_sectors = bio_cur_sectors(bio);
- req->hard_cur_sectors = req->current_nr_sectors;
- req->sector = req->hard_sector = bio->bi_sector;
- req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+ req->sector = bio->bi_sector;
+ req->data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1557,7 +1553,7 @@ EXPORT_SYMBOL(submit_bio);
int blk_rq_check_limits(struct request_queue *q, struct request *rq)
{
if (blk_rq_sectors(rq) > q->max_sectors ||
- rq->data_len > q->max_hw_sectors << 9) {
+ blk_rq_bytes(rq) > q->max_hw_sectors << 9) {
printk(KERN_ERR "%s: over max size limit.\n", __func__);
return -EIO;
}
@@ -1675,35 +1671,6 @@ static void blk_account_io_done(struct request *req)
}
}
-/**
- * blk_rq_bytes - Returns bytes left to complete in the entire request
- * @rq: the request being processed
- **/
-unsigned int blk_rq_bytes(struct request *rq)
-{
- if (blk_fs_request(rq))
- return blk_rq_sectors(rq) << 9;
-
- return rq->data_len;
-}
-EXPORT_SYMBOL_GPL(blk_rq_bytes);
-
-/**
- * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
- * @rq: the request being processed
- **/
-unsigned int blk_rq_cur_bytes(struct request *rq)
-{
- if (blk_fs_request(rq))
- return rq->current_nr_sectors << 9;
-
- if (rq->bio)
- return rq->bio->bi_size;
-
- return rq->data_len;
-}
-EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
-
struct request *elv_next_request(struct request_queue *q)
{
struct request *rq;
@@ -1736,7 +1703,7 @@ struct request *elv_next_request(struct request_queue *q)
if (rq->cmd_flags & REQ_DONTPREP)
break;
- if (q->dma_drain_size && rq->data_len) {
+ if (q->dma_drain_size && blk_rq_bytes(rq)) {
/*
* make sure space for the drain appears we
* know we can do this because max_hw_segments
@@ -1759,7 +1726,7 @@ struct request *elv_next_request(struct request_queue *q)
* avoid resource deadlock. REQ_STARTED will
* prevent other fs requests from passing this one.
*/
- if (q->dma_drain_size && rq->data_len &&
+ if (q->dma_drain_size && blk_rq_bytes(rq) &&
!(rq->cmd_flags & REQ_DONTPREP)) {
/*
* remove the space for the drain we added
@@ -1911,8 +1878,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
* can find how many bytes remain in the request
* later.
*/
- req->nr_sectors = req->hard_nr_sectors = 0;
- req->current_nr_sectors = req->hard_cur_sectors = 0;
+ req->data_len = 0;
return false;
}
@@ -1926,8 +1892,25 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
bio_iovec(bio)->bv_len -= nr_bytes;
}
- blk_recalc_rq_sectors(req, total_bytes >> 9);
+ req->data_len -= total_bytes;
+ req->buffer = bio_data(req->bio);
+
+ /* update sector only for requests with clear definition of sector */
+ if (blk_fs_request(req) || blk_discard_rq(req))
+ req->sector += total_bytes >> 9;
+
+ /*
+ * If total number of sectors is less than the first segment
+ * size, something has gone terribly wrong.
+ */
+ if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
+ printk(KERN_ERR "blk: request botched\n");
+ req->data_len = blk_rq_cur_bytes(req);
+ }
+
+ /* recalculate the number of segments */
blk_recalc_rq_segments(req);
+
return true;
}
EXPORT_SYMBOL_GPL(blk_update_request);
@@ -2049,11 +2032,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->buffer = bio_data(bio);
}
- rq->current_nr_sectors = bio_cur_sectors(bio);
- rq->hard_cur_sectors = rq->current_nr_sectors;
- rq->hard_nr_sectors = rq->nr_sectors = bio_sectors(bio);
rq->data_len = bio->bi_size;
-
rq->bio = rq->biotail = bio;
if (bio->bi_bdev)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index bf62a87..b8df66a 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -9,35 +9,6 @@
#include "blk.h"
-void blk_recalc_rq_sectors(struct request *rq, int nsect)
-{
- if (blk_fs_request(rq) || blk_discard_rq(rq)) {
- rq->hard_sector += nsect;
- rq->hard_nr_sectors -= nsect;
-
- /*
- * Move the I/O submission pointers ahead if required.
- */
- if ((rq->nr_sectors >= rq->hard_nr_sectors) &&
- (rq->sector <= rq->hard_sector)) {
- rq->sector = rq->hard_sector;
- rq->nr_sectors = rq->hard_nr_sectors;
- rq->hard_cur_sectors = bio_cur_sectors(rq->bio);
- rq->current_nr_sectors = rq->hard_cur_sectors;
- rq->buffer = bio_data(rq->bio);
- }
-
- /*
- * if total number of sectors is less than the first segment
- * size, something has gone terribly wrong
- */
- if (rq->nr_sectors < rq->current_nr_sectors) {
- printk(KERN_ERR "blk: request botched\n");
- rq->nr_sectors = rq->current_nr_sectors;
- }
- }
-}
-
static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
struct bio *bio)
{
@@ -199,8 +170,9 @@ new_segment:
if (unlikely(rq->cmd_flags & REQ_COPY_USER) &&
- (rq->data_len & q->dma_pad_mask)) {
- unsigned int pad_len = (q->dma_pad_mask & ~rq->data_len) + 1;
+ (blk_rq_bytes(rq) & q->dma_pad_mask)) {
+ unsigned int pad_len =
+ (q->dma_pad_mask & ~blk_rq_bytes(rq)) + 1;
sg->length += pad_len;
rq->extra_len += pad_len;
@@ -398,7 +370,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
req->biotail->bi_next = next->bio;
req->biotail = next->biotail;
- req->nr_sectors = req->hard_nr_sectors += next->hard_nr_sectors;
+ req->data_len += blk_rq_bytes(next);
elv_merge_requests(q, req, next);
diff --git a/block/blk.h b/block/blk.h
index 5111559..ab54529 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -101,7 +101,6 @@ int ll_front_merge_fn(struct request_queue *q, struct request *req,
int attempt_back_merge(struct request_queue *q, struct request *rq);
int attempt_front_merge(struct request_queue *q, struct request *rq);
void blk_recalc_rq_segments(struct request *rq);
-void blk_recalc_rq_sectors(struct request *rq, int nsect);
void blk_queue_congestion_threshold(struct request_queue *q);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index db4d990..99ac430 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -579,9 +579,9 @@ cfq_prio_tree_lookup(struct cfq_data *cfqd, struct rb_root *root,
* Sort strictly based on sector. Smallest to the left,
* largest to the right.
*/
- if (sector > cfqq->next_rq->sector)
+ if (sector > blk_rq_pos(cfqq->next_rq))
n = &(*p)->rb_right;
- else if (sector < cfqq->next_rq->sector)
+ else if (sector < blk_rq_pos(cfqq->next_rq))
n = &(*p)->rb_left;
else
break;
@@ -611,8 +611,8 @@ static void cfq_prio_tree_add(struct cfq_data *cfqd, struct cfq_queue *cfqq)
return;
cfqq->p_root = &cfqd->prio_trees[cfqq->org_ioprio];
- __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root, cfqq->next_rq->sector,
- &parent, &p);
+ __cfqq = cfq_prio_tree_lookup(cfqd, cfqq->p_root,
+ blk_rq_pos(cfqq->next_rq), &parent, &p);
if (!__cfqq) {
rb_link_node(&cfqq->p_node, parent, p);
rb_insert_color(&cfqq->p_node, cfqq->p_root);
@@ -996,7 +996,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
if (cfq_rq_close(cfqd, __cfqq->next_rq))
return __cfqq;
- if (__cfqq->next_rq->sector < sector)
+ if (blk_rq_pos(__cfqq->next_rq) < sector)
node = rb_next(&__cfqq->p_node);
else
node = rb_prev(&__cfqq->p_node);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index f37ca8c..d30ec6f 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -218,12 +218,12 @@ struct bio {
#define bio_sectors(bio) ((bio)->bi_size >> 9)
#define bio_empty_barrier(bio) (bio_barrier(bio) && !bio_has_data(bio) && !bio_discard(bio))
-static inline unsigned int bio_cur_sectors(struct bio *bio)
+static inline unsigned int bio_cur_bytes(struct bio *bio)
{
if (bio->bi_vcnt)
- return bio_iovec(bio)->bv_len >> 9;
+ return bio_iovec(bio)->bv_len;
else /* dataless requests such as discard */
- return bio->bi_size >> 9;
+ return bio->bi_size;
}
static inline void *bio_data(struct bio *bio)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b921d91..723d22e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -166,19 +166,8 @@ struct request {
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
- /* Maintain bio traversal state for part by part I/O submission.
- * hard_* are block layer internals, no driver should touch them!
- */
-
- sector_t sector; /* next sector to submit */
- sector_t hard_sector; /* next sector to complete */
- unsigned long nr_sectors; /* no. of sectors left to submit */
- unsigned long hard_nr_sectors; /* no. of sectors left to complete */
- /* no. of sectors left to submit in the current segment */
- unsigned int current_nr_sectors;
-
- /* no. of sectors left to complete in the current segment */
- unsigned int hard_cur_sectors;
+ sector_t sector; /* sector cursor */
+ unsigned int data_len; /* total data len, don't access directly */
struct bio *bio;
struct bio *biotail;
@@ -226,7 +215,6 @@ struct request {
unsigned char __cmd[BLK_MAX_CDB];
unsigned char *cmd;
- unsigned int data_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;
unsigned int resid_len; /* residual count */
@@ -841,20 +829,27 @@ extern void blkdev_dequeue_request(struct request *req);
*/
static inline sector_t blk_rq_pos(const struct request *rq)
{
- return rq->hard_sector;
+ return rq->sector;
+}
+
+static inline unsigned int blk_rq_bytes(const struct request *rq)
+{
+ return rq->data_len;
}
-extern unsigned int blk_rq_bytes(struct request *rq);
-extern unsigned int blk_rq_cur_bytes(struct request *rq);
+static inline int blk_rq_cur_bytes(const struct request *rq)
+{
+ return rq->bio ? bio_cur_bytes(rq->bio) : 0;
+}
static inline unsigned int blk_rq_sectors(const struct request *rq)
{
- return rq->hard_nr_sectors;
+ return blk_rq_bytes(rq) >> 9;
}
static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
{
- return rq->hard_cur_sectors;
+ return blk_rq_cur_bytes(rq) >> 9;
}
/*
@@ -929,7 +924,7 @@ static inline void blk_end_request_all(struct request *rq, int error)
*/
static inline bool blk_end_request_cur(struct request *rq, int error)
{
- return blk_end_request(rq, error, rq->hard_cur_sectors << 9);
+ return blk_end_request(rq, error, blk_rq_cur_bytes(rq));
}
/**
@@ -982,7 +977,7 @@ static inline void __blk_end_request_all(struct request *rq, int error)
*/
static inline bool __blk_end_request_cur(struct request *rq, int error)
{
- return __blk_end_request(rq, error, rq->hard_cur_sectors << 9);
+ return __blk_end_request(rq, error, blk_rq_cur_bytes(rq));
}
extern void blk_complete_request(struct request *);
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index c59b769..4e46287 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -171,7 +171,7 @@ enum {
ELV_MQUEUE_MUST,
};
-#define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors)
+#define rq_end_sector(rq) (blk_rq_pos(rq) + blk_rq_sectors(rq))
#define rb_entry_rq(node) rb_entry((node), struct request, rb_node)
/*
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 42f1c11..5708a14 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -642,12 +642,12 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
if (blk_pc_request(rq)) {
what |= BLK_TC_ACT(BLK_TC_PC);
- __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
- rq->cmd_len, rq->cmd);
+ __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
+ what, rq->errors, rq->cmd_len, rq->cmd);
} else {
what |= BLK_TC_ACT(BLK_TC_FS);
- __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
- rw, what, rq->errors, 0, NULL);
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), rw,
+ what, rq->errors, 0, NULL);
}
}
@@ -854,11 +854,11 @@ void blk_add_driver_data(struct request_queue *q,
return;
if (blk_pc_request(rq))
- __blk_add_trace(bt, 0, rq->data_len, 0, BLK_TA_DRV_DATA,
- rq->errors, len, data);
+ __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
+ BLK_TA_DRV_DATA, rq->errors, len, data);
else
- __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_sectors(rq) << 9,
- 0, BLK_TA_DRV_DATA, rq->errors, len, data);
+ __blk_add_trace(bt, blk_rq_pos(rq), blk_rq_bytes(rq), 0,
+ BLK_TA_DRV_DATA, rq->errors, len, data);
}
EXPORT_SYMBOL_GPL(blk_add_driver_data);
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 08/11] block: cleanup rq->data_len usages
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo, Darrick J. Wong
With recent unification of fields, it's now guaranteed that
rq->data_len always equals blk_rq_bytes(). Convert all non-IDE direct
users to accessors. IDE will be converted in a separate patch.
Boaz: spotted incorrect data_len/resid_len conversion in osd.
[ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
drivers/ata/libata-scsi.c | 2 +-
drivers/block/ub.c | 8 ++++----
drivers/message/fusion/mptsas.c | 20 ++++++++++----------
drivers/message/i2o/i2o_block.c | 2 +-
drivers/scsi/libsas/sas_expander.c | 8 ++++----
drivers/scsi/libsas/sas_host_smp.c | 18 +++++++++---------
drivers/scsi/mpt2sas/mpt2sas_transport.c | 21 +++++++++++----------
drivers/scsi/osd/osd_initiator.c | 4 ++--
drivers/scsi/scsi_lib.c | 13 ++++++-------
drivers/scsi/scsi_tgt_lib.c | 2 +-
10 files changed, 49 insertions(+), 49 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2733b0c..6e4c600 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1084,7 +1084,7 @@ static int atapi_drain_needed(struct request *rq)
if (likely(!blk_pc_request(rq)))
return 0;
- if (!rq->data_len || (rq->cmd_flags & REQ_RW))
+ if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW))
return 0;
return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index dc3b899..1591f61 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -747,7 +747,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
{
struct request *rq = urq->rq;
- if (rq->data_len == 0) {
+ if (blk_rq_bytes(rq) == 0) {
cmd->dir = UB_DIR_NONE;
} else {
if (rq_data_dir(rq) == WRITE)
@@ -762,7 +762,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
cmd->cdb_len = rq->cmd_len;
- cmd->len = rq->data_len;
+ cmd->len = blk_rq_bytes(rq);
/*
* To reapply this to every URB is not as incorrect as it looks.
@@ -783,8 +783,8 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
if (cmd->error == 0) {
if (blk_pc_request(rq)) {
- if (cmd->act_len < rq->data_len)
- rq->resid_len = rq->data_len - cmd->act_len;
+ if (cmd->act_len < blk_rq_bytes(rq))
+ rq->resid_len = blk_rq_bytes(rq) - cmd->act_len;
scsi_status = 0;
} else {
if (cmd->act_len != cmd->len) {
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 5d5f347..4e6fcf0 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -1277,8 +1277,8 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
/* do we need to support multiple segments? */
if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
printk(MYIOC_s_ERR_FMT "%s: multiple segments req %u %u, rsp %u %u\n",
- ioc->name, __func__, req->bio->bi_vcnt, req->data_len,
- rsp->bio->bi_vcnt, rsp->data_len);
+ ioc->name, __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
+ rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
return -EINVAL;
}
@@ -1295,7 +1295,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
smpreq = (SmpPassthroughRequest_t *)mf;
memset(smpreq, 0, sizeof(*smpreq));
- smpreq->RequestDataLength = cpu_to_le16(req->data_len - 4);
+ smpreq->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
smpreq->Function = MPI_FUNCTION_SMP_PASSTHROUGH;
if (rphy)
@@ -1321,10 +1321,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
MPI_SGE_FLAGS_END_OF_BUFFER |
MPI_SGE_FLAGS_DIRECTION |
mpt_addr_size()) << MPI_SGE_FLAGS_SHIFT;
- flagsLength |= (req->data_len - 4);
+ flagsLength |= (blk_rq_bytes(req) - 4);
dma_addr_out = pci_map_single(ioc->pcidev, bio_data(req->bio),
- req->data_len, PCI_DMA_BIDIRECTIONAL);
+ blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_out)
goto put_mf;
mpt_add_sge(psge, flagsLength, dma_addr_out);
@@ -1332,9 +1332,9 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
/* response */
flagsLength = MPT_SGE_FLAGS_SSIMPLE_READ;
- flagsLength |= rsp->data_len + 4;
+ flagsLength |= blk_rq_bytes(rsp) + 4;
dma_addr_in = pci_map_single(ioc->pcidev, bio_data(rsp->bio),
- rsp->data_len, PCI_DMA_BIDIRECTIONAL);
+ blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_in)
goto unmap;
mpt_add_sge(psge, flagsLength, dma_addr_in);
@@ -1357,7 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
memcpy(req->sense, smprep, sizeof(*smprep));
req->sense_len = sizeof(*smprep);
- rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
+ rsp->resid_len = blk_rq_bytes(rsp) - smprep->ResponseDataLength;
} else {
printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
ioc->name, __func__);
@@ -1365,10 +1365,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
}
unmap:
if (dma_addr_out)
- pci_unmap_single(ioc->pcidev, dma_addr_out, req->data_len,
+ pci_unmap_single(ioc->pcidev, dma_addr_out, blk_rq_bytes(req),
PCI_DMA_BIDIRECTIONAL);
if (dma_addr_in)
- pci_unmap_single(ioc->pcidev, dma_addr_in, rsp->data_len,
+ pci_unmap_single(ioc->pcidev, dma_addr_in, blk_rq_bytes(rsp),
PCI_DMA_BIDIRECTIONAL);
put_mf:
if (mf)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 510eb47..6b61d28 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -430,7 +430,7 @@ static void i2o_block_end_request(struct request *req, int error,
int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
if (blk_pc_request(req))
- leftover = req->data_len;
+ leftover = blk_rq_bytes(req);
if (error)
blk_end_request(req, -EIO, leftover);
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 6605ec9..531af9e 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1927,13 +1927,13 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
/* do we need to support multiple segments? */
if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
printk("%s: multiple segments req %u %u, rsp %u %u\n",
- __func__, req->bio->bi_vcnt, req->data_len,
- rsp->bio->bi_vcnt, rsp->data_len);
+ __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
+ rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
return -EINVAL;
}
- ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
- bio_data(rsp->bio), rsp->data_len);
+ ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
+ bio_data(rsp->bio), blk_rq_bytes(rsp));
if (ret > 0) {
/* positive number is the untransferred residual */
rsp->resid_len = ret;
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
index 89952ed..be9a951 100644
--- a/drivers/scsi/libsas/sas_host_smp.c
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -137,21 +137,21 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
int error = -EINVAL;
/* eight is the minimum size for request and response frames */
- if (req->data_len < 8 || rsp->data_len < 8)
+ if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
goto out;
- if (bio_offset(req->bio) + req->data_len > PAGE_SIZE ||
- bio_offset(rsp->bio) + rsp->data_len > PAGE_SIZE) {
+ if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
+ bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
shost_printk(KERN_ERR, shost,
"SMP request/response frame crosses page boundary");
goto out;
}
- req_data = kzalloc(req->data_len, GFP_KERNEL);
+ req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
/* make sure frame can always be built ... we copy
* back only the requested length */
- resp_data = kzalloc(max(rsp->data_len, 128U), GFP_KERNEL);
+ resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
if (!req_data || !resp_data) {
error = -ENOMEM;
@@ -160,7 +160,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
local_irq_disable();
buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
- memcpy(req_data, buf, req->data_len);
+ memcpy(req_data, buf, blk_rq_bytes(req));
kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
local_irq_enable();
@@ -176,8 +176,8 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
resp_data[1] = req_data[1];
resp_data[2] = SMP_RESP_FUNC_UNK;
- req->resid_len = req->data_len;
- rsp->resid_len = rsp->data_len;
+ req->resid_len = blk_rq_bytes(req);
+ rsp->resid_len = blk_rq_bytes(rsp);
switch (req_data[1]) {
case SMP_REPORT_GENERAL:
@@ -264,7 +264,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
local_irq_disable();
buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
- memcpy(buf, resp_data, rsp->data_len);
+ memcpy(buf, resp_data, blk_rq_bytes(rsp));
flush_kernel_dcache_page(bio_page(rsp->bio));
kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
local_irq_enable();
diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index 53759c5..af95a44 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1041,7 +1041,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
printk(MPT2SAS_ERR_FMT "%s: multiple segments req %u %u, "
"rsp %u %u\n", ioc->name, __func__, req->bio->bi_vcnt,
- req->data_len, rsp->bio->bi_vcnt, rsp->data_len);
+ blk_rq_bytes(req), rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
return -EINVAL;
}
@@ -1104,7 +1104,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
*((u64 *)&mpi_request->SASAddress) = (rphy) ?
cpu_to_le64(rphy->identify.sas_address) :
cpu_to_le64(ioc->sas_hba.sas_address);
- mpi_request->RequestDataLength = cpu_to_le16(req->data_len - 4);
+ mpi_request->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
psge = &mpi_request->SGL;
/* WRITE sgel first */
@@ -1112,13 +1112,13 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
- req->data_len, PCI_DMA_BIDIRECTIONAL);
+ blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_out) {
mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
goto unmap;
}
- ioc->base_add_sg_single(psge, sgl_flags | (req->data_len - 4),
+ ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(req) - 4),
dma_addr_out);
/* incr sgel */
@@ -1129,14 +1129,14 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
MPI2_SGE_FLAGS_END_OF_LIST);
sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
- dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
- rsp->data_len, PCI_DMA_BIDIRECTIONAL);
+ dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
+ blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_in) {
mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
goto unmap;
}
- ioc->base_add_sg_single(psge, sgl_flags | (rsp->data_len + 4),
+ ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(rsp) + 4),
dma_addr_in);
dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s - "
@@ -1170,7 +1170,8 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
req->sense_len = sizeof(*mpi_reply);
- rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
+ rsp->resid_len = blk_rq_bytes(rsp) -
+ mpi_reply->ResponseDataLength;
} else {
dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
"%s - no reply\n", ioc->name, __func__));
@@ -1186,10 +1187,10 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
unmap:
if (dma_addr_out)
- pci_unmap_single(ioc->pdev, dma_addr_out, req->data_len,
+ pci_unmap_single(ioc->pdev, dma_addr_out, blk_rq_bytes(req),
PCI_DMA_BIDIRECTIONAL);
if (dma_addr_in)
- pci_unmap_single(ioc->pdev, dma_addr_in, rsp->data_len,
+ pci_unmap_single(ioc->pdev, dma_addr_in, blk_rq_bytes(rsp),
PCI_DMA_BIDIRECTIONAL);
out:
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 2a5f077..d178a8b 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -1299,7 +1299,7 @@ int osd_finalize_request(struct osd_request *or,
return ret;
}
OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n",
- _LLU(or->out.total_bytes), or->out.req->data_len);
+ _LLU(or->out.total_bytes), blk_rq_bytes(or->out.req));
}
if (or->in.bio) {
ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio);
@@ -1308,7 +1308,7 @@ int osd_finalize_request(struct osd_request *or,
return ret;
}
OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n",
- _LLU(or->in.total_bytes), or->in.req->data_len);
+ _LLU(or->in.total_bytes), blk_rq_bytes(or->in.req));
}
or->out.pad_buff = sg_out_pad_buffer;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 39b3acf..3d16c70 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -682,14 +682,13 @@ EXPORT_SYMBOL(scsi_release_buffers);
static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
{
struct request *req = cmd->request;
- unsigned int dlen = req->data_len;
- unsigned int next_dlen = req->next_rq->data_len;
req->resid_len = scsi_out(cmd)->resid;
req->next_rq->resid_len = scsi_in(cmd)->resid;
/* The req and req->next_rq have not been completed */
- BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
+ BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req),
+ blk_rq_bytes(req->next_rq)));
scsi_release_buffers(cmd);
@@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
BUG_ON(count > sdb->table.nents);
sdb->table.nents = count;
if (blk_pc_request(req))
- sdb->length = req->data_len;
+ sdb->length = blk_rq_bytes(req);
else
sdb->length = blk_rq_sectors(req) << 9;
return BLKPREP_OK;
@@ -1087,21 +1086,21 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
if (unlikely(ret))
return ret;
} else {
- BUG_ON(req->data_len);
+ BUG_ON(blk_rq_bytes(req));
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
req->buffer = NULL;
}
cmd->cmd_len = req->cmd_len;
- if (!req->data_len)
+ if (!blk_rq_bytes(req))
cmd->sc_data_direction = DMA_NONE;
else if (rq_data_dir(req) == WRITE)
cmd->sc_data_direction = DMA_TO_DEVICE;
else
cmd->sc_data_direction = DMA_FROM_DEVICE;
- cmd->transfersize = req->data_len;
+ cmd->transfersize = blk_rq_bytes(req);
cmd->allowed = req->retries;
return BLKPREP_OK;
}
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index 48ba413..1030327 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -387,7 +387,7 @@ static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
* we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
* length for us.
*/
- cmd->sdb.length = rq->data_len;
+ cmd->sdb.length = blk_rq_bytes(rq);
return 0;
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 08/11] block: cleanup rq->data_len usages
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo, Darrick J. Wong
With recent unification of fields, it's now guaranteed that
rq->data_len always equals blk_rq_bytes(). Convert all non-IDE direct
users to accessors. IDE will be converted in a separate patch.
Boaz: spotted incorrect data_len/resid_len conversion in osd.
[ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Eric Moore <Eric.Moore@lsi.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
drivers/ata/libata-scsi.c | 2 +-
drivers/block/ub.c | 8 ++++----
drivers/message/fusion/mptsas.c | 20 ++++++++++----------
drivers/message/i2o/i2o_block.c | 2 +-
drivers/scsi/libsas/sas_expander.c | 8 ++++----
drivers/scsi/libsas/sas_host_smp.c | 18 +++++++++---------
drivers/scsi/mpt2sas/mpt2sas_transport.c | 21 +++++++++++----------
drivers/scsi/osd/osd_initiator.c | 4 ++--
drivers/scsi/scsi_lib.c | 13 ++++++-------
drivers/scsi/scsi_tgt_lib.c | 2 +-
10 files changed, 49 insertions(+), 49 deletions(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 2733b0c..6e4c600 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1084,7 +1084,7 @@ static int atapi_drain_needed(struct request *rq)
if (likely(!blk_pc_request(rq)))
return 0;
- if (!rq->data_len || (rq->cmd_flags & REQ_RW))
+ if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW))
return 0;
return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index dc3b899..1591f61 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -747,7 +747,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
{
struct request *rq = urq->rq;
- if (rq->data_len == 0) {
+ if (blk_rq_bytes(rq) == 0) {
cmd->dir = UB_DIR_NONE;
} else {
if (rq_data_dir(rq) == WRITE)
@@ -762,7 +762,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
cmd->cdb_len = rq->cmd_len;
- cmd->len = rq->data_len;
+ cmd->len = blk_rq_bytes(rq);
/*
* To reapply this to every URB is not as incorrect as it looks.
@@ -783,8 +783,8 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
if (cmd->error == 0) {
if (blk_pc_request(rq)) {
- if (cmd->act_len < rq->data_len)
- rq->resid_len = rq->data_len - cmd->act_len;
+ if (cmd->act_len < blk_rq_bytes(rq))
+ rq->resid_len = blk_rq_bytes(rq) - cmd->act_len;
scsi_status = 0;
} else {
if (cmd->act_len != cmd->len) {
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 5d5f347..4e6fcf0 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -1277,8 +1277,8 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
/* do we need to support multiple segments? */
if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
printk(MYIOC_s_ERR_FMT "%s: multiple segments req %u %u, rsp %u %u\n",
- ioc->name, __func__, req->bio->bi_vcnt, req->data_len,
- rsp->bio->bi_vcnt, rsp->data_len);
+ ioc->name, __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
+ rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
return -EINVAL;
}
@@ -1295,7 +1295,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
smpreq = (SmpPassthroughRequest_t *)mf;
memset(smpreq, 0, sizeof(*smpreq));
- smpreq->RequestDataLength = cpu_to_le16(req->data_len - 4);
+ smpreq->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
smpreq->Function = MPI_FUNCTION_SMP_PASSTHROUGH;
if (rphy)
@@ -1321,10 +1321,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
MPI_SGE_FLAGS_END_OF_BUFFER |
MPI_SGE_FLAGS_DIRECTION |
mpt_addr_size()) << MPI_SGE_FLAGS_SHIFT;
- flagsLength |= (req->data_len - 4);
+ flagsLength |= (blk_rq_bytes(req) - 4);
dma_addr_out = pci_map_single(ioc->pcidev, bio_data(req->bio),
- req->data_len, PCI_DMA_BIDIRECTIONAL);
+ blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_out)
goto put_mf;
mpt_add_sge(psge, flagsLength, dma_addr_out);
@@ -1332,9 +1332,9 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
/* response */
flagsLength = MPT_SGE_FLAGS_SSIMPLE_READ;
- flagsLength |= rsp->data_len + 4;
+ flagsLength |= blk_rq_bytes(rsp) + 4;
dma_addr_in = pci_map_single(ioc->pcidev, bio_data(rsp->bio),
- rsp->data_len, PCI_DMA_BIDIRECTIONAL);
+ blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_in)
goto unmap;
mpt_add_sge(psge, flagsLength, dma_addr_in);
@@ -1357,7 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
memcpy(req->sense, smprep, sizeof(*smprep));
req->sense_len = sizeof(*smprep);
- rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
+ rsp->resid_len = blk_rq_bytes(rsp) - smprep->ResponseDataLength;
} else {
printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
ioc->name, __func__);
@@ -1365,10 +1365,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
}
unmap:
if (dma_addr_out)
- pci_unmap_single(ioc->pcidev, dma_addr_out, req->data_len,
+ pci_unmap_single(ioc->pcidev, dma_addr_out, blk_rq_bytes(req),
PCI_DMA_BIDIRECTIONAL);
if (dma_addr_in)
- pci_unmap_single(ioc->pcidev, dma_addr_in, rsp->data_len,
+ pci_unmap_single(ioc->pcidev, dma_addr_in, blk_rq_bytes(rsp),
PCI_DMA_BIDIRECTIONAL);
put_mf:
if (mf)
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 510eb47..6b61d28 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -430,7 +430,7 @@ static void i2o_block_end_request(struct request *req, int error,
int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
if (blk_pc_request(req))
- leftover = req->data_len;
+ leftover = blk_rq_bytes(req);
if (error)
blk_end_request(req, -EIO, leftover);
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 6605ec9..531af9e 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1927,13 +1927,13 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
/* do we need to support multiple segments? */
if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
printk("%s: multiple segments req %u %u, rsp %u %u\n",
- __func__, req->bio->bi_vcnt, req->data_len,
- rsp->bio->bi_vcnt, rsp->data_len);
+ __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
+ rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
return -EINVAL;
}
- ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
- bio_data(rsp->bio), rsp->data_len);
+ ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
+ bio_data(rsp->bio), blk_rq_bytes(rsp));
if (ret > 0) {
/* positive number is the untransferred residual */
rsp->resid_len = ret;
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
index 89952ed..be9a951 100644
--- a/drivers/scsi/libsas/sas_host_smp.c
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -137,21 +137,21 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
int error = -EINVAL;
/* eight is the minimum size for request and response frames */
- if (req->data_len < 8 || rsp->data_len < 8)
+ if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
goto out;
- if (bio_offset(req->bio) + req->data_len > PAGE_SIZE ||
- bio_offset(rsp->bio) + rsp->data_len > PAGE_SIZE) {
+ if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
+ bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
shost_printk(KERN_ERR, shost,
"SMP request/response frame crosses page boundary");
goto out;
}
- req_data = kzalloc(req->data_len, GFP_KERNEL);
+ req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
/* make sure frame can always be built ... we copy
* back only the requested length */
- resp_data = kzalloc(max(rsp->data_len, 128U), GFP_KERNEL);
+ resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
if (!req_data || !resp_data) {
error = -ENOMEM;
@@ -160,7 +160,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
local_irq_disable();
buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
- memcpy(req_data, buf, req->data_len);
+ memcpy(req_data, buf, blk_rq_bytes(req));
kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
local_irq_enable();
@@ -176,8 +176,8 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
resp_data[1] = req_data[1];
resp_data[2] = SMP_RESP_FUNC_UNK;
- req->resid_len = req->data_len;
- rsp->resid_len = rsp->data_len;
+ req->resid_len = blk_rq_bytes(req);
+ rsp->resid_len = blk_rq_bytes(rsp);
switch (req_data[1]) {
case SMP_REPORT_GENERAL:
@@ -264,7 +264,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
local_irq_disable();
buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
- memcpy(buf, resp_data, rsp->data_len);
+ memcpy(buf, resp_data, blk_rq_bytes(rsp));
flush_kernel_dcache_page(bio_page(rsp->bio));
kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
local_irq_enable();
diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index 53759c5..af95a44 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1041,7 +1041,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
printk(MPT2SAS_ERR_FMT "%s: multiple segments req %u %u, "
"rsp %u %u\n", ioc->name, __func__, req->bio->bi_vcnt,
- req->data_len, rsp->bio->bi_vcnt, rsp->data_len);
+ blk_rq_bytes(req), rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
return -EINVAL;
}
@@ -1104,7 +1104,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
*((u64 *)&mpi_request->SASAddress) = (rphy) ?
cpu_to_le64(rphy->identify.sas_address) :
cpu_to_le64(ioc->sas_hba.sas_address);
- mpi_request->RequestDataLength = cpu_to_le16(req->data_len - 4);
+ mpi_request->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
psge = &mpi_request->SGL;
/* WRITE sgel first */
@@ -1112,13 +1112,13 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
- req->data_len, PCI_DMA_BIDIRECTIONAL);
+ blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_out) {
mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
goto unmap;
}
- ioc->base_add_sg_single(psge, sgl_flags | (req->data_len - 4),
+ ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(req) - 4),
dma_addr_out);
/* incr sgel */
@@ -1129,14 +1129,14 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
MPI2_SGE_FLAGS_END_OF_LIST);
sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
- dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
- rsp->data_len, PCI_DMA_BIDIRECTIONAL);
+ dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
+ blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
if (!dma_addr_in) {
mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
goto unmap;
}
- ioc->base_add_sg_single(psge, sgl_flags | (rsp->data_len + 4),
+ ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(rsp) + 4),
dma_addr_in);
dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s - "
@@ -1170,7 +1170,8 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
req->sense_len = sizeof(*mpi_reply);
- rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
+ rsp->resid_len = blk_rq_bytes(rsp) -
+ mpi_reply->ResponseDataLength;
} else {
dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
"%s - no reply\n", ioc->name, __func__));
@@ -1186,10 +1187,10 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
unmap:
if (dma_addr_out)
- pci_unmap_single(ioc->pdev, dma_addr_out, req->data_len,
+ pci_unmap_single(ioc->pdev, dma_addr_out, blk_rq_bytes(req),
PCI_DMA_BIDIRECTIONAL);
if (dma_addr_in)
- pci_unmap_single(ioc->pdev, dma_addr_in, rsp->data_len,
+ pci_unmap_single(ioc->pdev, dma_addr_in, blk_rq_bytes(rsp),
PCI_DMA_BIDIRECTIONAL);
out:
diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index 2a5f077..d178a8b 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -1299,7 +1299,7 @@ int osd_finalize_request(struct osd_request *or,
return ret;
}
OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n",
- _LLU(or->out.total_bytes), or->out.req->data_len);
+ _LLU(or->out.total_bytes), blk_rq_bytes(or->out.req));
}
if (or->in.bio) {
ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio);
@@ -1308,7 +1308,7 @@ int osd_finalize_request(struct osd_request *or,
return ret;
}
OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n",
- _LLU(or->in.total_bytes), or->in.req->data_len);
+ _LLU(or->in.total_bytes), blk_rq_bytes(or->in.req));
}
or->out.pad_buff = sg_out_pad_buffer;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 39b3acf..3d16c70 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -682,14 +682,13 @@ EXPORT_SYMBOL(scsi_release_buffers);
static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
{
struct request *req = cmd->request;
- unsigned int dlen = req->data_len;
- unsigned int next_dlen = req->next_rq->data_len;
req->resid_len = scsi_out(cmd)->resid;
req->next_rq->resid_len = scsi_in(cmd)->resid;
/* The req and req->next_rq have not been completed */
- BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
+ BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req),
+ blk_rq_bytes(req->next_rq)));
scsi_release_buffers(cmd);
@@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
BUG_ON(count > sdb->table.nents);
sdb->table.nents = count;
if (blk_pc_request(req))
- sdb->length = req->data_len;
+ sdb->length = blk_rq_bytes(req);
else
sdb->length = blk_rq_sectors(req) << 9;
return BLKPREP_OK;
@@ -1087,21 +1086,21 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
if (unlikely(ret))
return ret;
} else {
- BUG_ON(req->data_len);
+ BUG_ON(blk_rq_bytes(req));
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
req->buffer = NULL;
}
cmd->cmd_len = req->cmd_len;
- if (!req->data_len)
+ if (!blk_rq_bytes(req))
cmd->sc_data_direction = DMA_NONE;
else if (rq_data_dir(req) == WRITE)
cmd->sc_data_direction = DMA_TO_DEVICE;
else
cmd->sc_data_direction = DMA_FROM_DEVICE;
- cmd->transfersize = req->data_len;
+ cmd->transfersize = blk_rq_bytes(req);
cmd->allowed = req->retries;
return BLKPREP_OK;
}
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index 48ba413..1030327 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -387,7 +387,7 @@ static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
* we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
* length for us.
*/
- cmd->sdb.length = rq->data_len;
+ cmd->sdb.length = blk_rq_bytes(rq);
return 0;
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 09/11] ide: cleanup rq->data_len usages
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
With recent unification of fields, it's now guaranteed that
rq->data_len always equals blk_rq_bytes(). Convert all direct users
to accessors.
[ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
---
drivers/ide/ide-atapi.c | 4 ++--
drivers/ide/ide-cd.c | 25 +++++++------------------
drivers/ide/ide-floppy.c | 4 ++--
drivers/ide/ide-io.c | 2 +-
4 files changed, 12 insertions(+), 23 deletions(-)
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e4a02a0..792534d 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -255,7 +255,7 @@ void ide_retry_pc(ide_drive_t *drive)
ide_init_pc(pc);
memcpy(pc->c, sense_rq->cmd, 12);
pc->buf = bio_data(sense_rq->bio); /* pointer to mapped address */
- pc->req_xfer = sense_rq->data_len;
+ pc->req_xfer = blk_rq_bytes(sense_rq);
if (drive->media == ide_tape)
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
@@ -303,7 +303,7 @@ int ide_cd_get_xferlen(struct request *rq)
return 32768;
else if (blk_sense_request(rq) || blk_pc_request(rq) ||
rq->cmd_type == REQ_TYPE_ATA_PC)
- return rq->data_len;
+ return blk_rq_bytes(rq);
else
return 0;
}
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 94a341b..1a58b38 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -576,7 +576,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
struct request *rq = hwif->rq;
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, thislen, uptodate = 0;
- int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0, nsectors;
+ int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
int sense = blk_sense_request(rq);
unsigned int timeout;
u16 len;
@@ -706,9 +706,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
out_end:
if (blk_pc_request(rq) && rc == 0) {
- if (blk_end_request(rq, 0, rq->data_len))
- BUG();
-
+ blk_end_request_all(rq, 0);
hwif->rq = NULL;
} else {
if (sense && uptodate)
@@ -726,22 +724,14 @@ out_end:
ide_cd_error_cmd(drive, cmd);
/* make sure it's fully ended */
- if (blk_pc_request(rq))
- nsectors = (rq->data_len + 511) >> 9;
- else
- nsectors = blk_rq_sectors(rq);
-
- if (nsectors == 0)
- nsectors = 1;
-
if (blk_fs_request(rq) == 0) {
- rq->resid_len = rq->data_len -
+ rq->resid_len = blk_rq_bytes(rq) -
(cmd->nbytes - cmd->nleft);
if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
rq->resid_len += cmd->last_xfer_len;
}
- ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
+ ide_complete_rq(drive, uptodate ? 0 : -EIO, blk_rq_bytes(rq));
if (sense && rc == 2)
ide_error(drive, "request sense failure", stat);
@@ -818,7 +808,7 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
*/
alignment = queue_dma_alignment(q) | q->dma_pad_mask;
if ((unsigned long)buf & alignment
- || rq->data_len & q->dma_pad_mask
+ || blk_rq_bytes(rq) & q->dma_pad_mask
|| object_is_on_stack(buf))
drive->dma = 0;
}
@@ -866,9 +856,8 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
cmd.rq = rq;
- if (blk_fs_request(rq) || rq->data_len) {
- ide_init_sg_cmd(&cmd, blk_fs_request(rq) ?
- (blk_rq_sectors(rq) << 9) : rq->data_len);
+ if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
+ ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
ide_map_sg(drive, &cmd);
}
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 1c460bd..6509817 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -220,14 +220,14 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
ide_init_pc(pc);
memcpy(pc->c, rq->cmd, sizeof(pc->c));
pc->rq = rq;
- if (rq->data_len) {
+ if (blk_rq_bytes(rq)) {
pc->flags |= PC_FLAG_DMA_OK;
if (rq_data_dir(rq) == WRITE)
pc->flags |= PC_FLAG_WRITING;
}
/* pio will be performed by ide_pio_bytes() which handles sg fine */
pc->buf = NULL;
- pc->req_xfer = pc->buf_size = rq->data_len;
+ pc->req_xfer = pc->buf_size = blk_rq_bytes(rq);
}
static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 59799ca..ca2519d 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -116,7 +116,7 @@ void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err)
unsigned int ide_rq_bytes(struct request *rq)
{
if (blk_pc_request(rq))
- return rq->data_len;
+ return blk_rq_bytes(rq);
else
return blk_rq_cur_sectors(rq) << 9;
}
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 09/11] ide: cleanup rq->data_len usages
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
With recent unification of fields, it's now guaranteed that
rq->data_len always equals blk_rq_bytes(). Convert all direct users
to accessors.
[ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
---
drivers/ide/ide-atapi.c | 4 ++--
drivers/ide/ide-cd.c | 25 +++++++------------------
drivers/ide/ide-floppy.c | 4 ++--
drivers/ide/ide-io.c | 2 +-
4 files changed, 12 insertions(+), 23 deletions(-)
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index e4a02a0..792534d 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -255,7 +255,7 @@ void ide_retry_pc(ide_drive_t *drive)
ide_init_pc(pc);
memcpy(pc->c, sense_rq->cmd, 12);
pc->buf = bio_data(sense_rq->bio); /* pointer to mapped address */
- pc->req_xfer = sense_rq->data_len;
+ pc->req_xfer = blk_rq_bytes(sense_rq);
if (drive->media == ide_tape)
set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
@@ -303,7 +303,7 @@ int ide_cd_get_xferlen(struct request *rq)
return 32768;
else if (blk_sense_request(rq) || blk_pc_request(rq) ||
rq->cmd_type == REQ_TYPE_ATA_PC)
- return rq->data_len;
+ return blk_rq_bytes(rq);
else
return 0;
}
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 94a341b..1a58b38 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -576,7 +576,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
struct request *rq = hwif->rq;
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, thislen, uptodate = 0;
- int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0, nsectors;
+ int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
int sense = blk_sense_request(rq);
unsigned int timeout;
u16 len;
@@ -706,9 +706,7 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
out_end:
if (blk_pc_request(rq) && rc == 0) {
- if (blk_end_request(rq, 0, rq->data_len))
- BUG();
-
+ blk_end_request_all(rq, 0);
hwif->rq = NULL;
} else {
if (sense && uptodate)
@@ -726,22 +724,14 @@ out_end:
ide_cd_error_cmd(drive, cmd);
/* make sure it's fully ended */
- if (blk_pc_request(rq))
- nsectors = (rq->data_len + 511) >> 9;
- else
- nsectors = blk_rq_sectors(rq);
-
- if (nsectors == 0)
- nsectors = 1;
-
if (blk_fs_request(rq) == 0) {
- rq->resid_len = rq->data_len -
+ rq->resid_len = blk_rq_bytes(rq) -
(cmd->nbytes - cmd->nleft);
if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
rq->resid_len += cmd->last_xfer_len;
}
- ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
+ ide_complete_rq(drive, uptodate ? 0 : -EIO, blk_rq_bytes(rq));
if (sense && rc == 2)
ide_error(drive, "request sense failure", stat);
@@ -818,7 +808,7 @@ static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
*/
alignment = queue_dma_alignment(q) | q->dma_pad_mask;
if ((unsigned long)buf & alignment
- || rq->data_len & q->dma_pad_mask
+ || blk_rq_bytes(rq) & q->dma_pad_mask
|| object_is_on_stack(buf))
drive->dma = 0;
}
@@ -866,9 +856,8 @@ static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
cmd.rq = rq;
- if (blk_fs_request(rq) || rq->data_len) {
- ide_init_sg_cmd(&cmd, blk_fs_request(rq) ?
- (blk_rq_sectors(rq) << 9) : rq->data_len);
+ if (blk_fs_request(rq) || blk_rq_bytes(rq)) {
+ ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
ide_map_sg(drive, &cmd);
}
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 1c460bd..6509817 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -220,14 +220,14 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
ide_init_pc(pc);
memcpy(pc->c, rq->cmd, sizeof(pc->c));
pc->rq = rq;
- if (rq->data_len) {
+ if (blk_rq_bytes(rq)) {
pc->flags |= PC_FLAG_DMA_OK;
if (rq_data_dir(rq) == WRITE)
pc->flags |= PC_FLAG_WRITING;
}
/* pio will be performed by ide_pio_bytes() which handles sg fine */
pc->buf = NULL;
- pc->req_xfer = pc->buf_size = rq->data_len;
+ pc->req_xfer = pc->buf_size = blk_rq_bytes(rq);
}
static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 59799ca..ca2519d 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -116,7 +116,7 @@ void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err)
unsigned int ide_rq_bytes(struct request *rq)
{
if (blk_pc_request(rq))
- return rq->data_len;
+ return blk_rq_bytes(rq);
else
return blk_rq_cur_sectors(rq) << 9;
}
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 10/11] block: hide request sector and data_len
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
Block low level drivers for some reason have been pretty good at
abusing block layer API. Especially struct request's fields tend to
get violated in all possible ways. Make it clear that low level
drivers MUST NOT access or manipulate rq->sector and rq->data_len
directly by prefixing them with double underscores.
This change is also necessary to break build of out-of-tree codes
which assume the previous block API where internal fields can be
manipulated and rq->data_len carries residual count on completion.
[ Impact: hide internal fields, block API change ]
Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-core.c | 20 ++++++++++----------
block/blk-map.c | 2 +-
block/blk-merge.c | 2 +-
include/linux/blkdev.h | 9 +++++----
4 files changed, 17 insertions(+), 16 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 3596ca7..6226a38 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,7 +127,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
INIT_LIST_HEAD(&rq->timeout_list);
rq->cpu = -1;
rq->q = q;
- rq->sector = (sector_t) -1;
+ rq->__sector = (sector_t) -1;
INIT_HLIST_NODE(&rq->hash);
RB_CLEAR_NODE(&rq->rb_node);
rq->cmd = rq->__cmd;
@@ -1095,7 +1095,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
req->cmd_flags |= REQ_NOIDLE;
req->errors = 0;
- req->sector = bio->bi_sector;
+ req->__sector = bio->bi_sector;
req->ioprio = bio_prio(bio);
blk_rq_bio_prep(req->q, req, bio);
}
@@ -1143,7 +1143,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
req->biotail->bi_next = bio;
req->biotail = bio;
- req->data_len += bytes;
+ req->__data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1169,8 +1169,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
* not touch req->buffer either...
*/
req->buffer = bio_data(bio);
- req->sector = bio->bi_sector;
- req->data_len += bytes;
+ req->__sector = bio->bi_sector;
+ req->__data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1878,7 +1878,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
* can find how many bytes remain in the request
* later.
*/
- req->data_len = 0;
+ req->__data_len = 0;
return false;
}
@@ -1892,12 +1892,12 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
bio_iovec(bio)->bv_len -= nr_bytes;
}
- req->data_len -= total_bytes;
+ req->__data_len -= total_bytes;
req->buffer = bio_data(req->bio);
/* update sector only for requests with clear definition of sector */
if (blk_fs_request(req) || blk_discard_rq(req))
- req->sector += total_bytes >> 9;
+ req->__sector += total_bytes >> 9;
/*
* If total number of sectors is less than the first segment
@@ -1905,7 +1905,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
*/
if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
printk(KERN_ERR "blk: request botched\n");
- req->data_len = blk_rq_cur_bytes(req);
+ req->__data_len = blk_rq_cur_bytes(req);
}
/* recalculate the number of segments */
@@ -2032,7 +2032,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->buffer = bio_data(bio);
}
- rq->data_len = bio->bi_size;
+ rq->__data_len = bio->bi_size;
rq->bio = rq->biotail = bio;
if (bio->bi_bdev)
diff --git a/block/blk-map.c b/block/blk-map.c
index 694fefa..56082be 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -20,7 +20,7 @@ int blk_rq_append_bio(struct request_queue *q, struct request *rq,
rq->biotail->bi_next = bio;
rq->biotail = bio;
- rq->data_len += bio->bi_size;
+ rq->__data_len += bio->bi_size;
}
return 0;
}
diff --git a/block/blk-merge.c b/block/blk-merge.c
index b8df66a..4974dd5 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -370,7 +370,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
req->biotail->bi_next = next->bio;
req->biotail = next->biotail;
- req->data_len += blk_rq_bytes(next);
+ req->__data_len += blk_rq_bytes(next);
elv_merge_requests(q, req, next);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 723d22e..6617abd 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -166,8 +166,9 @@ struct request {
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
- sector_t sector; /* sector cursor */
- unsigned int data_len; /* total data len, don't access directly */
+ /* the following two fields are internal, NEVER access directly */
+ sector_t __sector; /* sector cursor */
+ unsigned int __data_len; /* total data len */
struct bio *bio;
struct bio *biotail;
@@ -829,12 +830,12 @@ extern void blkdev_dequeue_request(struct request *req);
*/
static inline sector_t blk_rq_pos(const struct request *rq)
{
- return rq->sector;
+ return rq->__sector;
}
static inline unsigned int blk_rq_bytes(const struct request *rq)
{
- return rq->data_len;
+ return rq->__data_len;
}
static inline int blk_rq_cur_bytes(const struct request *rq)
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 10/11] block: hide request sector and data_len
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
Block low level drivers for some reason have been pretty good at
abusing block layer API. Especially struct request's fields tend to
get violated in all possible ways. Make it clear that low level
drivers MUST NOT access or manipulate rq->sector and rq->data_len
directly by prefixing them with double underscores.
This change is also necessary to break build of out-of-tree codes
which assume the previous block API where internal fields can be
manipulated and rq->data_len carries residual count on completion.
[ Impact: hide internal fields, block API change ]
Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-core.c | 20 ++++++++++----------
block/blk-map.c | 2 +-
block/blk-merge.c | 2 +-
include/linux/blkdev.h | 9 +++++----
4 files changed, 17 insertions(+), 16 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 3596ca7..6226a38 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,7 +127,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
INIT_LIST_HEAD(&rq->timeout_list);
rq->cpu = -1;
rq->q = q;
- rq->sector = (sector_t) -1;
+ rq->__sector = (sector_t) -1;
INIT_HLIST_NODE(&rq->hash);
RB_CLEAR_NODE(&rq->rb_node);
rq->cmd = rq->__cmd;
@@ -1095,7 +1095,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
req->cmd_flags |= REQ_NOIDLE;
req->errors = 0;
- req->sector = bio->bi_sector;
+ req->__sector = bio->bi_sector;
req->ioprio = bio_prio(bio);
blk_rq_bio_prep(req->q, req, bio);
}
@@ -1143,7 +1143,7 @@ static int __make_request(struct request_queue *q, struct bio *bio)
req->biotail->bi_next = bio;
req->biotail = bio;
- req->data_len += bytes;
+ req->__data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1169,8 +1169,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
* not touch req->buffer either...
*/
req->buffer = bio_data(bio);
- req->sector = bio->bi_sector;
- req->data_len += bytes;
+ req->__sector = bio->bi_sector;
+ req->__data_len += bytes;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
@@ -1878,7 +1878,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
* can find how many bytes remain in the request
* later.
*/
- req->data_len = 0;
+ req->__data_len = 0;
return false;
}
@@ -1892,12 +1892,12 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
bio_iovec(bio)->bv_len -= nr_bytes;
}
- req->data_len -= total_bytes;
+ req->__data_len -= total_bytes;
req->buffer = bio_data(req->bio);
/* update sector only for requests with clear definition of sector */
if (blk_fs_request(req) || blk_discard_rq(req))
- req->sector += total_bytes >> 9;
+ req->__sector += total_bytes >> 9;
/*
* If total number of sectors is less than the first segment
@@ -1905,7 +1905,7 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
*/
if (blk_rq_bytes(req) < blk_rq_cur_bytes(req)) {
printk(KERN_ERR "blk: request botched\n");
- req->data_len = blk_rq_cur_bytes(req);
+ req->__data_len = blk_rq_cur_bytes(req);
}
/* recalculate the number of segments */
@@ -2032,7 +2032,7 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->buffer = bio_data(bio);
}
- rq->data_len = bio->bi_size;
+ rq->__data_len = bio->bi_size;
rq->bio = rq->biotail = bio;
if (bio->bi_bdev)
diff --git a/block/blk-map.c b/block/blk-map.c
index 694fefa..56082be 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -20,7 +20,7 @@ int blk_rq_append_bio(struct request_queue *q, struct request *rq,
rq->biotail->bi_next = bio;
rq->biotail = bio;
- rq->data_len += bio->bi_size;
+ rq->__data_len += bio->bi_size;
}
return 0;
}
diff --git a/block/blk-merge.c b/block/blk-merge.c
index b8df66a..4974dd5 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -370,7 +370,7 @@ static int attempt_merge(struct request_queue *q, struct request *req,
req->biotail->bi_next = next->bio;
req->biotail = next->biotail;
- req->data_len += blk_rq_bytes(next);
+ req->__data_len += blk_rq_bytes(next);
elv_merge_requests(q, req, next);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 723d22e..6617abd 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -166,8 +166,9 @@ struct request {
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
- sector_t sector; /* sector cursor */
- unsigned int data_len; /* total data len, don't access directly */
+ /* the following two fields are internal, NEVER access directly */
+ sector_t __sector; /* sector cursor */
+ unsigned int __data_len; /* total data len */
struct bio *bio;
struct bio *biotail;
@@ -829,12 +830,12 @@ extern void blkdev_dequeue_request(struct request *req);
*/
static inline sector_t blk_rq_pos(const struct request *rq)
{
- return rq->sector;
+ return rq->__sector;
}
static inline unsigned int blk_rq_bytes(const struct request *rq)
{
- return rq->data_len;
+ return rq->__data_len;
}
static inline int blk_rq_cur_bytes(const struct request *rq)
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 11/11] block: blk_rq_[cur_]_{sectors|bytes}() usage cleanup
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-04 7:58 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Cc: Tejun Heo
With the previous changes, the followings are now guaranteed for all
requests in any valid state.
* blk_rq_sectors() == blk_rq_bytes() >> 9
* blk_rq_cur_sectors() == blk_rq_cur_bytes() >> 9
Clean up accessor usages. Notable changes are
* nbd,i2o_block: end_all used instead of explicit byte count
* scsi_lib: unnecessary conditional on request type removed
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
---
drivers/block/floppy.c | 7 +++----
drivers/block/nbd.c | 6 +++---
drivers/block/ub.c | 2 +-
drivers/block/z2ram.c | 2 +-
drivers/memstick/core/mspro_block.c | 4 ++--
drivers/message/i2o/i2o_block.c | 16 ++++------------
drivers/mtd/mtd_blkdevs.c | 2 +-
drivers/sbus/char/jsflash.c | 2 +-
drivers/scsi/scsi_lib.c | 7 ++-----
9 files changed, 18 insertions(+), 30 deletions(-)
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 4524862..1e27ed9 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2512,8 +2512,7 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
remaining = current_count_sectors << 9;
#ifdef FLOPPY_SANITY_CHECK
- if ((remaining >> 9) > blk_rq_sectors(current_req) &&
- CT(COMMAND) == FD_WRITE) {
+ if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
DPRINT("in copy buffer\n");
printk("current_count_sectors=%ld\n", current_count_sectors);
printk("remaining=%d\n", remaining >> 9);
@@ -2530,7 +2529,7 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
- size = blk_rq_cur_sectors(current_req) << 9;
+ size = blk_rq_cur_bytes(current_req);
rq_for_each_segment(bv, current_req, iter) {
if (!remaining)
@@ -2879,7 +2878,7 @@ static int make_raw_rw_request(void)
printk("write\n");
return 0;
}
- } else if (raw_cmd->length > blk_rq_sectors(current_req) << 9 ||
+ } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
current_count_sectors > blk_rq_sectors(current_req)) {
DPRINT("buffer overrun in direct transfer\n");
return 0;
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 977a573..fad167d 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -110,7 +110,7 @@ static void nbd_end_request(struct request *req)
req, error ? "failed" : "done");
spin_lock_irqsave(q->queue_lock, flags);
- __blk_end_request(req, error, blk_rq_sectors(req) << 9);
+ __blk_end_request_all(req, error);
spin_unlock_irqrestore(q->queue_lock, flags);
}
@@ -231,7 +231,7 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
{
int result, flags;
struct nbd_request request;
- unsigned long size = blk_rq_sectors(req) << 9;
+ unsigned long size = blk_rq_bytes(req);
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(nbd_cmd(req));
@@ -243,7 +243,7 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
lo->disk->disk_name, req,
nbdcmd_to_ascii(nbd_cmd(req)),
(unsigned long long)blk_rq_pos(req) << 9,
- blk_rq_sectors(req) << 9);
+ blk_rq_bytes(req));
result = sock_xmit(lo, 1, &request, sizeof(request),
(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
if (result <= 0) {
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 1591f61..40d03cf 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -739,7 +739,7 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
cmd->cdb[8] = nblks;
cmd->cdb_len = 10;
- cmd->len = blk_rq_sectors(rq) * 512;
+ cmd->len = blk_rq_bytes(rq);
}
static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index d4e6b71..6a13838 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -72,7 +72,7 @@ static void do_z2_request(struct request_queue *q)
struct request *req;
while ((req = elv_next_request(q)) != NULL) {
unsigned long start = blk_rq_pos(req) << 9;
- unsigned long len = blk_rq_cur_sectors(req) << 9;
+ unsigned long len = blk_rq_cur_bytes(req);
if (start + len > z2ram_size) {
printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 9e600d2..93b2c61 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -680,7 +680,7 @@ try_again:
t_sec = blk_rq_pos(msb->block_req) << 9;
sector_div(t_sec, msb->page_size);
- count = blk_rq_sectors(msb->block_req) << 9;
+ count = blk_rq_bytes(msb->block_req);
count /= msb->page_size;
param.system = msb->system;
@@ -745,7 +745,7 @@ static int mspro_block_complete_req(struct memstick_dev *card, int error)
t_len *= msb->page_size;
}
} else
- t_len = blk_rq_sectors(msb->block_req) << 9;
+ t_len = blk_rq_bytes(msb->block_req);
dev_dbg(&card->dev, "transferred %x (%d)\n", t_len, error);
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 6b61d28..e153f5d 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -426,15 +426,9 @@ static void i2o_block_end_request(struct request *req, int error,
struct request_queue *q = req->q;
unsigned long flags;
- if (blk_end_request(req, error, nr_bytes)) {
- int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
-
- if (blk_pc_request(req))
- leftover = blk_rq_bytes(req);
-
+ if (blk_end_request(req, error, nr_bytes))
if (error)
- blk_end_request(req, -EIO, leftover);
- }
+ blk_end_request_all(req, -EIO);
spin_lock_irqsave(q->queue_lock, flags);
@@ -832,15 +826,13 @@ static int i2o_block_transfer(struct request *req)
memcpy(mptr, cmd, 10);
mptr += 4;
- *mptr++ =
- cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
+ *mptr++ = cpu_to_le32(blk_rq_bytes(req));
} else
#endif
{
msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
*mptr++ = cpu_to_le32(ctl_flags);
- *mptr++ =
- cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
+ *mptr++ = cpu_to_le32(blk_rq_bytes(req));
*mptr++ =
cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT));
*mptr++ =
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 4ea2e67..50c76a2 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -48,7 +48,7 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
char *buf;
block = blk_rq_pos(req) << 9 >> tr->blkshift;
- nsect = blk_rq_cur_sectors(req) << 9 >> tr->blkshift;
+ nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
buf = req->buffer;
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index 2132c90..d56ddaa 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -189,7 +189,7 @@ static void jsfd_do_request(struct request_queue *q)
while ((req = elv_next_request(q)) != NULL) {
struct jsfd_part *jdp = req->rq_disk->private_data;
unsigned long offset = blk_rq_pos(req) << 9;
- size_t len = blk_rq_cur_sectors(req) << 9;
+ size_t len = blk_rq_cur_bytes(req);
if ((offset + len) > jdp->dsize) {
__blk_end_request_cur(req, -EIO);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 3d16c70..ee308f6 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -546,7 +546,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
* to queue the remainder of them.
*/
if (blk_end_request(req, error, bytes)) {
- int leftover = blk_rq_sectors(req) << 9;
+ int leftover = blk_rq_bytes(req);
if (blk_pc_request(req))
leftover = req->resid_len;
@@ -964,10 +964,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
count = blk_rq_map_sg(req->q, req, sdb->table.sgl);
BUG_ON(count > sdb->table.nents);
sdb->table.nents = count;
- if (blk_pc_request(req))
- sdb->length = blk_rq_bytes(req);
- else
- sdb->length = blk_rq_sectors(req) << 9;
+ sdb->length = blk_rq_bytes(req);
return BLKPREP_OK;
}
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* [PATCH 11/11] block: blk_rq_[cur_]_{sectors|bytes}() usage cleanup
@ 2009-05-04 7:58 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-04 7:58 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Cc: Tejun Heo
With the previous changes, the followings are now guaranteed for all
requests in any valid state.
* blk_rq_sectors() == blk_rq_bytes() >> 9
* blk_rq_cur_sectors() == blk_rq_cur_bytes() >> 9
Clean up accessor usages. Notable changes are
* nbd,i2o_block: end_all used instead of explicit byte count
* scsi_lib: unnecessary conditional on request type removed
[ Impact: cleanup ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul Clements <paul.clements@steeleye.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
---
drivers/block/floppy.c | 7 +++----
drivers/block/nbd.c | 6 +++---
drivers/block/ub.c | 2 +-
drivers/block/z2ram.c | 2 +-
drivers/memstick/core/mspro_block.c | 4 ++--
drivers/message/i2o/i2o_block.c | 16 ++++------------
drivers/mtd/mtd_blkdevs.c | 2 +-
drivers/sbus/char/jsflash.c | 2 +-
drivers/scsi/scsi_lib.c | 7 ++-----
9 files changed, 18 insertions(+), 30 deletions(-)
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 4524862..1e27ed9 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2512,8 +2512,7 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
remaining = current_count_sectors << 9;
#ifdef FLOPPY_SANITY_CHECK
- if ((remaining >> 9) > blk_rq_sectors(current_req) &&
- CT(COMMAND) == FD_WRITE) {
+ if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
DPRINT("in copy buffer\n");
printk("current_count_sectors=%ld\n", current_count_sectors);
printk("remaining=%d\n", remaining >> 9);
@@ -2530,7 +2529,7 @@ static void copy_buffer(int ssize, int max_sector, int max_sector_2)
dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
- size = blk_rq_cur_sectors(current_req) << 9;
+ size = blk_rq_cur_bytes(current_req);
rq_for_each_segment(bv, current_req, iter) {
if (!remaining)
@@ -2879,7 +2878,7 @@ static int make_raw_rw_request(void)
printk("write\n");
return 0;
}
- } else if (raw_cmd->length > blk_rq_sectors(current_req) << 9 ||
+ } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
current_count_sectors > blk_rq_sectors(current_req)) {
DPRINT("buffer overrun in direct transfer\n");
return 0;
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 977a573..fad167d 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -110,7 +110,7 @@ static void nbd_end_request(struct request *req)
req, error ? "failed" : "done");
spin_lock_irqsave(q->queue_lock, flags);
- __blk_end_request(req, error, blk_rq_sectors(req) << 9);
+ __blk_end_request_all(req, error);
spin_unlock_irqrestore(q->queue_lock, flags);
}
@@ -231,7 +231,7 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
{
int result, flags;
struct nbd_request request;
- unsigned long size = blk_rq_sectors(req) << 9;
+ unsigned long size = blk_rq_bytes(req);
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(nbd_cmd(req));
@@ -243,7 +243,7 @@ static int nbd_send_req(struct nbd_device *lo, struct request *req)
lo->disk->disk_name, req,
nbdcmd_to_ascii(nbd_cmd(req)),
(unsigned long long)blk_rq_pos(req) << 9,
- blk_rq_sectors(req) << 9);
+ blk_rq_bytes(req));
result = sock_xmit(lo, 1, &request, sizeof(request),
(nbd_cmd(req) == NBD_CMD_WRITE) ? MSG_MORE : 0);
if (result <= 0) {
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 1591f61..40d03cf 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -739,7 +739,7 @@ static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
cmd->cdb[8] = nblks;
cmd->cdb_len = 10;
- cmd->len = blk_rq_sectors(rq) * 512;
+ cmd->len = blk_rq_bytes(rq);
}
static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index d4e6b71..6a13838 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -72,7 +72,7 @@ static void do_z2_request(struct request_queue *q)
struct request *req;
while ((req = elv_next_request(q)) != NULL) {
unsigned long start = blk_rq_pos(req) << 9;
- unsigned long len = blk_rq_cur_sectors(req) << 9;
+ unsigned long len = blk_rq_cur_bytes(req);
if (start + len > z2ram_size) {
printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 9e600d2..93b2c61 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -680,7 +680,7 @@ try_again:
t_sec = blk_rq_pos(msb->block_req) << 9;
sector_div(t_sec, msb->page_size);
- count = blk_rq_sectors(msb->block_req) << 9;
+ count = blk_rq_bytes(msb->block_req);
count /= msb->page_size;
param.system = msb->system;
@@ -745,7 +745,7 @@ static int mspro_block_complete_req(struct memstick_dev *card, int error)
t_len *= msb->page_size;
}
} else
- t_len = blk_rq_sectors(msb->block_req) << 9;
+ t_len = blk_rq_bytes(msb->block_req);
dev_dbg(&card->dev, "transferred %x (%d)\n", t_len, error);
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 6b61d28..e153f5d 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -426,15 +426,9 @@ static void i2o_block_end_request(struct request *req, int error,
struct request_queue *q = req->q;
unsigned long flags;
- if (blk_end_request(req, error, nr_bytes)) {
- int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
-
- if (blk_pc_request(req))
- leftover = blk_rq_bytes(req);
-
+ if (blk_end_request(req, error, nr_bytes))
if (error)
- blk_end_request(req, -EIO, leftover);
- }
+ blk_end_request_all(req, -EIO);
spin_lock_irqsave(q->queue_lock, flags);
@@ -832,15 +826,13 @@ static int i2o_block_transfer(struct request *req)
memcpy(mptr, cmd, 10);
mptr += 4;
- *mptr++ =
- cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
+ *mptr++ = cpu_to_le32(blk_rq_bytes(req));
} else
#endif
{
msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
*mptr++ = cpu_to_le32(ctl_flags);
- *mptr++ =
- cpu_to_le32(blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
+ *mptr++ = cpu_to_le32(blk_rq_bytes(req));
*mptr++ =
cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT));
*mptr++ =
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 4ea2e67..50c76a2 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -48,7 +48,7 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
char *buf;
block = blk_rq_pos(req) << 9 >> tr->blkshift;
- nsect = blk_rq_cur_sectors(req) << 9 >> tr->blkshift;
+ nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
buf = req->buffer;
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index 2132c90..d56ddaa 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -189,7 +189,7 @@ static void jsfd_do_request(struct request_queue *q)
while ((req = elv_next_request(q)) != NULL) {
struct jsfd_part *jdp = req->rq_disk->private_data;
unsigned long offset = blk_rq_pos(req) << 9;
- size_t len = blk_rq_cur_sectors(req) << 9;
+ size_t len = blk_rq_cur_bytes(req);
if ((offset + len) > jdp->dsize) {
__blk_end_request_cur(req, -EIO);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 3d16c70..ee308f6 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -546,7 +546,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
* to queue the remainder of them.
*/
if (blk_end_request(req, error, bytes)) {
- int leftover = blk_rq_sectors(req) << 9;
+ int leftover = blk_rq_bytes(req);
if (blk_pc_request(req))
leftover = req->resid_len;
@@ -964,10 +964,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
count = blk_rq_map_sg(req->q, req, sdb->table.sgl);
BUG_ON(count > sdb->table.nents);
sdb->table.nents = count;
- if (blk_pc_request(req))
- sdb->length = blk_rq_bytes(req);
- else
- sdb->length = blk_rq_sectors(req) << 9;
+ sdb->length = blk_rq_bytes(req);
return BLKPREP_OK;
}
--
1.6.0.2
^ permalink raw reply related [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-04 7:58 ` Tejun Heo
(?)
@ 2009-05-04 12:08 ` Sergei Shtylyov
2009-05-05 3:41 ` Tejun Heo
-1 siblings, 1 reply; 73+ messages in thread
From: Sergei Shtylyov @ 2009-05-04 12:08 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, mike.miller, Eric.Moore, stern,
fujita.tomonori, zaitcev, Geert.Uytterhoeven, sfr, grant.likely,
paul.clements, tim, jeremy, adrian, oakad, dwmw2, schwidefsky,
ballabio_dario, davem, rusty, Markus.Lidel, bharrosh,
Doug Gilbert, Darrick J. Wong
Hello.
Tejun Heo wrote:
> rq->data_len served two purposes - the length of data buffer on issue
> and the residual count on completion. This duality creates some
> headaches.
> First of all, block layer and low level drivers can't really determine
> what rq->data_len contains while a request is executing. It could be
> the total request length or it coulde be anything else one of the
> lower layers is using to keep track of residual count. This
> complicates things because blk_rq_bytes() and thus
> [__]blk_end_request_all() relies on rq->data_len for PC commands.
> Drivers which want to report residual count should first cache the
> total request length, update rq->data_len and then complete the
> request with the cached data length.
> Secondly, it makes requests default to reporting full residual count,
> ie. reporting that no data transfer occurred. The residual count is
> an exception not the norm; however, the driver should clear
> rq->data_len to zero to signify the normal cases while leaving it
> alone means no data transfer occurred at all. This reverse default
> behavior complicates code unnecessarily and renders block PC on some
> drivers (ide-tape/floppy) unuseable.
> This patch adds rq->resid_len which is used only for residual count.
> While at it, remove now unnecessasry blk_rq_bytes() caching in
> ide_pc_intr() as rq->data_len is not changed anymore.
> Boaz: spotted missing conversion in osd.
> [ Impact: cleanup residual count handling, report 0 resid by default ]
> Signed-off-by: Tejun Heo <tj@kernel.org>
[...]
> diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
> index 7149224..3813a0e 100644
> --- a/drivers/ide/ide-tape.c
> +++ b/drivers/ide/ide-tape.c
> @@ -380,7 +380,7 @@ static int ide_tape_callback(ide_drive_t *drive, int dsc)
> }
>
> tape->first_frame += blocks;
> - rq->data_len -= blocks * tape->blk_size;
> + rq->resid_len = blk_rq_bytes(rq) - blocks * tape->blk_size;
Is it already guaranteed that rq->data_len == blk_rq_bytes(rq) here?
MBR, Sergei
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 04/11] block: implement blk_rq_pos/[cur_]sectors() and convert obvious ones
2009-05-04 7:58 ` Tejun Heo
(?)
@ 2009-05-04 13:45 ` Sergei Shtylyov
2009-05-05 3:42 ` Tejun Heo
-1 siblings, 1 reply; 73+ messages in thread
From: Sergei Shtylyov @ 2009-05-04 13:45 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, mike.miller, Eric.Moore, stern,
fujita.tomonori, zaitcev, Geert.Uytterhoeven, sfr, grant.likely,
paul.clements, tim, jeremy, adrian, oakad, dwmw2, schwidefsky,
ballabio_dario, davem, rusty, Markus.Lidel, bharrosh
Tejun Heo wrote:
> Implement accessors - blk_rq_pos(), blk_rq_sectors() and
> blk_rq_cur_sectors() which return rq->sector, rq->hard_nr_sectors and
Well, blk_rq_pos() returns rq->hard_sector, not rq->sector, doesn't it?
> rq->hard_cur_sectors respectively and convert direct references of the
> said fields to the accessors.
> This is in preparation of request data length handling cleanup.
> const added to struct request * parameter to accessors as suggested by
> Geert Uytterhoeven.
> [ Impact: cleanup ]
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
> Tested-by: Grant Likely <grant.likely@secretlab.ca>
> Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 7ab93d9..b921d91 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -833,13 +833,30 @@ static inline void blk_run_address_space(struct address_space *mapping)
> extern void blkdev_dequeue_request(struct request *req);
>
> /*
> - * blk_end_request() takes bytes instead of sectors as a complete size.
> - * blk_rq_bytes() returns bytes left to complete in the entire request.
> - * blk_rq_cur_bytes() returns bytes left to complete in the current segment.
> + * blk_rq_pos() : the current sector
> + * blk_rq_bytes() : bytes left in the entire request
> + * blk_rq_cur_bytes() : bytes left in the current segment
> + * blk_rq_sectors() : sectors left in the entire request
> + * blk_rq_cur_sectors() : sectors left in the current segment
> */
> +static inline sector_t blk_rq_pos(const struct request *rq)
> +{
> + return rq->hard_sector;
> +}
> +
[...]
MBR, Sergei
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 08/11] block: cleanup rq->data_len usages
2009-05-04 7:58 ` Tejun Heo
(?)
@ 2009-05-04 14:41 ` Sergei Shtylyov
-1 siblings, 0 replies; 73+ messages in thread
From: Sergei Shtylyov @ 2009-05-04 14:41 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, mike.miller, Eric.Moore, stern,
fujita.tomonori, zaitcev, Geert.Uytterhoeven, sfr, grant.likely,
paul.clements, tim, jeremy, adrian, oakad, dwmw2, schwidefsky,
ballabio_dario, davem, rusty, Markus.Lidel, bharrosh,
Darrick J. Wong
Tejun Heo wrote:
> With recent unification of fields, it's now guaranteed that
> rq->data_len always equals blk_rq_bytes(). Convert all non-IDE direct
> users to accessors. IDE will be converted in a separate patch.
> Boaz: spotted incorrect data_len/resid_len conversion in osd.
> [ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
> Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
MBR, Sergei
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 05/11] block: convert to pos and nr_sectors accessors
2009-05-04 7:58 ` Tejun Heo
(?)
@ 2009-05-04 19:48 ` Adrian McMenamin
2009-05-05 3:42 ` Tejun Heo
-1 siblings, 1 reply; 73+ messages in thread
From: Adrian McMenamin @ 2009-05-04 19:48 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh, Jeff Garzik
On Mon, 2009-05-04 at 16:58 +0900, Tejun Heo wrote:
> With recent cleanups, there is no place where low level driver
> directly manipulates request fields. This means that the 'hard'
> request fields always equal the !hard fields. Convert all
> rq->sectors, nr_sectors and current_nr_sectors references to
> accessors.
>
> [ Impact: use pos and nr_sectors accessors ]
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
> Tested-by: Grant Likely <grant.likely@secretlab.ca>
> Acked-by: Grant Likely <grant.likely@secretlab.ca>
> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
I have re-tested this on the Dreamcast and it still works :)
Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-04 12:08 ` Sergei Shtylyov
@ 2009-05-05 3:41 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-05 3:41 UTC (permalink / raw)
To: Sergei Shtylyov
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, mike.miller, Eric.Moore, stern,
fujita.tomonori, zaitcev, Geert.Uytterhoeven, sfr, grant.likely,
paul.clements, tim, jeremy, adrian, oakad, dwmw2, schwidefsky,
ballabio_dario, davem, rusty, Markus.Lidel, bharrosh,
Doug Gilbert, Darrick J. Wong
Sergei Shtylyov wrote:
>> diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
>> index 7149224..3813a0e 100644
>> --- a/drivers/ide/ide-tape.c
>> +++ b/drivers/ide/ide-tape.c
>> @@ -380,7 +380,7 @@ static int ide_tape_callback(ide_drive_t *drive,
>> int dsc)
>> }
>>
>> tape->first_frame += blocks;
>> - rq->data_len -= blocks * tape->blk_size;
>> + rq->resid_len = blk_rq_bytes(rq) - blocks * tape->blk_size;
>
> Is it already guaranteed that rq->data_len == blk_rq_bytes(rq) here?
Oops, no. I'll move it to later ide-cleanup-rq-data_len-usages patch.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 04/11] block: implement blk_rq_pos/[cur_]sectors() and convert obvious ones
2009-05-04 13:45 ` Sergei Shtylyov
@ 2009-05-05 3:42 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-05 3:42 UTC (permalink / raw)
To: Sergei Shtylyov
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, mike.miller, Eric.Moore, stern,
fujita.tomonori, zaitcev, Geert.Uytterhoeven, sfr, grant.likely,
paul.clements, tim, jeremy, adrian, oakad, dwmw2, schwidefsky,
ballabio_dario, davem, rusty, Markus.Lidel, bharrosh
Sergei Shtylyov wrote:
> Tejun Heo wrote:
>
>> Implement accessors - blk_rq_pos(), blk_rq_sectors() and
>> blk_rq_cur_sectors() which return rq->sector, rq->hard_nr_sectors and
>
> Well, blk_rq_pos() returns rq->hard_sector, not rq->sector, doesn't it?
Right, description updated.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 05/11] block: convert to pos and nr_sectors accessors
2009-05-04 19:48 ` Adrian McMenamin
@ 2009-05-05 3:42 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-05 3:42 UTC (permalink / raw)
To: Adrian McMenamin
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh, Jeff Garzik
Adrian McMenamin wrote:
> On Mon, 2009-05-04 at 16:58 +0900, Tejun Heo wrote:
>> With recent cleanups, there is no place where low level driver
>> directly manipulates request fields. This means that the 'hard'
>> request fields always equal the !hard fields. Convert all
>> rq->sectors, nr_sectors and current_nr_sectors references to
>> accessors.
>>
>> [ Impact: use pos and nr_sectors accessors ]
>>
>> Signed-off-by: Tejun Heo <tj@kernel.org>
>> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
>> Tested-by: Grant Likely <grant.likely@secretlab.ca>
>> Acked-by: Grant Likely <grant.likely@secretlab.ca>
>> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
>> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
>
> I have re-tested this on the Dreamcast and it still works :)
>
> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Thanks. Much appreciated.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-04 7:58 ` Tejun Heo
@ 2009-05-05 3:59 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-05 3:59 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Hello,
Tejun Heo wrote:
> Upon ack, please pull from the following git tree.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
git tree has been updated as per comments.
* Acked-by:'s added.
* Too early blk_rq_bytes() conversion in ide-tape pushed to later
patch.
Both changes are minor and don't make any difference to the final
result. The new commit is f7ff5f0d7cda0b0da5e7de36dd97ff75412bbe16.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
@ 2009-05-05 3:59 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-05 3:59 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Hello,
Tejun Heo wrote:
> Upon ack, please pull from the following git tree.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
git tree has been updated as per comments.
* Acked-by:'s added.
* Too early blk_rq_bytes() conversion in ide-tape pushed to later
patch.
Both changes are minor and don't make any difference to the final
result. The new commit is f7ff5f0d7cda0b0da5e7de36dd97ff75412bbe16.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-05 3:59 ` Tejun Heo
@ 2009-05-07 2:48 ` Tejun Heo
-1 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-07 2:48 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petko
Tejun Heo wrote:
> Hello,
>
> Tejun Heo wrote:
>> Upon ack, please pull from the following git tree.
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
>
> git tree has been updated as per comments.
>
> * Acked-by:'s added.
>
> * Too early blk_rq_bytes() conversion in ide-tape pushed to later
> patch.
>
> Both changes are minor and don't make any difference to the final
> result. The new commit is f7ff5f0d7cda0b0da5e7de36dd97ff75412bbe16.
Tree updated again. Changes are...
* I forgot to convert new drivers (mg_disk and swim) to accessors.
0005-block-convert-to-pos-and-nr_sectors-accessors.patch updated to
convert these new drivers.
* Acked-by added.
The new commit is 1df2a196e28cc8f97919dc530dc1c019e1d3a968.
diff f7ff5f0d..1df2a196 follows. The conversions are straight
forward.
drivers/block/mg_disk.c | 25 +++++++++++++------------
drivers/block/swim.c | 6 +++---
2 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index 71e56cc..826c349 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -220,7 +220,8 @@ static void mg_dump_status(const char *msg, unsigned int stat,
if (host->breq) {
req = elv_next_request(host->breq);
if (req)
- printk(", sector=%u", (u32)req->sector);
+ printk(", sector=%u",
+ (unsigned int)blk_rq_pos(req));
}
}
@@ -493,12 +494,12 @@ static void mg_read(struct request *req)
u32 j;
struct mg_host *host = req->rq_disk->private_data;
- if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, NULL) !=
- MG_ERR_NONE)
+ if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
+ MG_CMD_RD, NULL) != MG_ERR_NONE)
mg_bad_rw_intr(host);
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- req->nr_sectors, req->sector, req->buffer);
+ blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
do {
u16 *buff = (u16 *)req->buffer;
@@ -522,14 +523,14 @@ static void mg_write(struct request *req)
u32 j;
struct mg_host *host = req->rq_disk->private_data;
- if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, NULL) !=
- MG_ERR_NONE) {
+ if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
+ MG_CMD_WR, NULL) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- req->nr_sectors, req->sector, req->buffer);
+ blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
do {
u16 *buff = (u16 *)req->buffer;
@@ -579,7 +580,7 @@ ok_to_read:
(i << 1));
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
- req->sector, req->nr_sectors - 1, req->buffer);
+ blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
/* send read confirm */
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
@@ -609,7 +610,7 @@ static void mg_write_intr(struct mg_host *host)
break;
if (!MG_READY_OK(i))
break;
- if ((req->nr_sectors <= 1) || (i & ATA_DRQ))
+ if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
goto ok_to_write;
} while (0);
mg_dump_status("mg_write_intr", i, host);
@@ -627,7 +628,7 @@ ok_to_write:
buff++;
}
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
- req->sector, req->nr_sectors, req->buffer);
+ blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
host->mg_do_intr = mg_write_intr;
mod_timer(&host->timer, jiffies + 3 * HZ);
}
@@ -749,9 +750,9 @@ static void mg_request(struct request_queue *q)
del_timer(&host->timer);
- sect_num = req->sector;
+ sect_num = blk_rq_pos(req);
/* deal whole segments */
- sect_cnt = req->nr_sectors;
+ sect_cnt = blk_rq_sectors(req);
/* sanity check */
if (sect_num >= get_capacity(req->rq_disk) ||
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 97ef426..fc6a1c3 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -531,7 +531,7 @@ static void redo_fd_request(struct request_queue *q)
while ((req = elv_next_request(q))) {
fs = req->rq_disk->private_data;
- if (req->sector < 0 || req->sector >= fs->total_secs) {
+ if (blk_rq_pos(req) >= fs->total_secs) {
__blk_end_request_cur(req, -EIO);
continue;
}
@@ -551,8 +551,8 @@ static void redo_fd_request(struct request_queue *q)
__blk_end_request_cur(req, -EIO);
break;
case READ:
- if (floppy_read_sectors(fs, req->sector,
- req->current_nr_sectors,
+ if (floppy_read_sectors(fs, blk_rq_pos(req),
+ blk_rq_cur_sectors(req),
req->buffer)) {
__blk_end_request_cur(req, -EIO);
continue;
--
tejun
^ permalink raw reply related [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
@ 2009-05-07 2:48 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-07 2:48 UTC (permalink / raw)
To: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Tejun Heo wrote:
> Hello,
>
> Tejun Heo wrote:
>> Upon ack, please pull from the following git tree.
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
>
> git tree has been updated as per comments.
>
> * Acked-by:'s added.
>
> * Too early blk_rq_bytes() conversion in ide-tape pushed to later
> patch.
>
> Both changes are minor and don't make any difference to the final
> result. The new commit is f7ff5f0d7cda0b0da5e7de36dd97ff75412bbe16.
Tree updated again. Changes are...
* I forgot to convert new drivers (mg_disk and swim) to accessors.
0005-block-convert-to-pos-and-nr_sectors-accessors.patch updated to
convert these new drivers.
* Acked-by added.
The new commit is 1df2a196e28cc8f97919dc530dc1c019e1d3a968.
diff f7ff5f0d..1df2a196 follows. The conversions are straight
forward.
drivers/block/mg_disk.c | 25 +++++++++++++------------
drivers/block/swim.c | 6 +++---
2 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/block/mg_disk.c b/drivers/block/mg_disk.c
index 71e56cc..826c349 100644
--- a/drivers/block/mg_disk.c
+++ b/drivers/block/mg_disk.c
@@ -220,7 +220,8 @@ static void mg_dump_status(const char *msg, unsigned int stat,
if (host->breq) {
req = elv_next_request(host->breq);
if (req)
- printk(", sector=%u", (u32)req->sector);
+ printk(", sector=%u",
+ (unsigned int)blk_rq_pos(req));
}
}
@@ -493,12 +494,12 @@ static void mg_read(struct request *req)
u32 j;
struct mg_host *host = req->rq_disk->private_data;
- if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_RD, NULL) !=
- MG_ERR_NONE)
+ if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
+ MG_CMD_RD, NULL) != MG_ERR_NONE)
mg_bad_rw_intr(host);
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- req->nr_sectors, req->sector, req->buffer);
+ blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
do {
u16 *buff = (u16 *)req->buffer;
@@ -522,14 +523,14 @@ static void mg_write(struct request *req)
u32 j;
struct mg_host *host = req->rq_disk->private_data;
- if (mg_out(host, req->sector, req->nr_sectors, MG_CMD_WR, NULL) !=
- MG_ERR_NONE) {
+ if (mg_out(host, blk_rq_pos(req), blk_rq_sectors(req),
+ MG_CMD_WR, NULL) != MG_ERR_NONE) {
mg_bad_rw_intr(host);
return;
}
MG_DBG("requested %d sects (from %ld), buffer=0x%p\n",
- req->nr_sectors, req->sector, req->buffer);
+ blk_rq_sectors(req), blk_rq_pos(req), req->buffer);
do {
u16 *buff = (u16 *)req->buffer;
@@ -579,7 +580,7 @@ ok_to_read:
(i << 1));
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
- req->sector, req->nr_sectors - 1, req->buffer);
+ blk_rq_pos(req), blk_rq_sectors(req) - 1, req->buffer);
/* send read confirm */
outb(MG_CMD_RD_CONF, (unsigned long)host->dev_base + MG_REG_COMMAND);
@@ -609,7 +610,7 @@ static void mg_write_intr(struct mg_host *host)
break;
if (!MG_READY_OK(i))
break;
- if ((req->nr_sectors <= 1) || (i & ATA_DRQ))
+ if ((blk_rq_sectors(req) <= 1) || (i & ATA_DRQ))
goto ok_to_write;
} while (0);
mg_dump_status("mg_write_intr", i, host);
@@ -627,7 +628,7 @@ ok_to_write:
buff++;
}
MG_DBG("sector %ld, remaining=%ld, buffer=0x%p\n",
- req->sector, req->nr_sectors, req->buffer);
+ blk_rq_pos(req), blk_rq_sectors(req), req->buffer);
host->mg_do_intr = mg_write_intr;
mod_timer(&host->timer, jiffies + 3 * HZ);
}
@@ -749,9 +750,9 @@ static void mg_request(struct request_queue *q)
del_timer(&host->timer);
- sect_num = req->sector;
+ sect_num = blk_rq_pos(req);
/* deal whole segments */
- sect_cnt = req->nr_sectors;
+ sect_cnt = blk_rq_sectors(req);
/* sanity check */
if (sect_num >= get_capacity(req->rq_disk) ||
diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index 97ef426..fc6a1c3 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -531,7 +531,7 @@ static void redo_fd_request(struct request_queue *q)
while ((req = elv_next_request(q))) {
fs = req->rq_disk->private_data;
- if (req->sector < 0 || req->sector >= fs->total_secs) {
+ if (blk_rq_pos(req) >= fs->total_secs) {
__blk_end_request_cur(req, -EIO);
continue;
}
@@ -551,8 +551,8 @@ static void redo_fd_request(struct request_queue *q)
__blk_end_request_cur(req, -EIO);
break;
case READ:
- if (floppy_read_sectors(fs, req->sector,
- req->current_nr_sectors,
+ if (floppy_read_sectors(fs, blk_rq_pos(req),
+ blk_rq_cur_sectors(req),
req->buffer)) {
__blk_end_request_cur(req, -EIO);
continue;
--
tejun
^ permalink raw reply related [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-04 7:58 ` Tejun Heo
(?)
(?)
@ 2009-05-07 10:23 ` FUJITA Tomonori
-1 siblings, 0 replies; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-07 10:23 UTC (permalink / raw)
To: tj
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh, dgilbert, djwong
On Mon, 4 May 2009 16:58:39 +0900
Tejun Heo <tj@kernel.org> wrote:
> Cc: Pete Zaitcev <zaitcev@redhat.com>
> Cc: Boaz Harrosh <bharrosh@panasas.com>
> ---
> block/bsg.c | 8 +++---
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
The changes to sg, st, and smp stuff also look fine.
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-04 7:58 ` Tejun Heo
` (12 preceding siblings ...)
(?)
@ 2009-05-07 10:23 ` FUJITA Tomonori
2009-05-08 2:06 ` FUJITA Tomonori
-1 siblings, 1 reply; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-07 10:23 UTC (permalink / raw)
To: tj
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
On Mon, 4 May 2009 16:58:36 +0900
Tejun Heo <tj@kernel.org> wrote:
> Hello,
>
> Upon ack, please pull from the following git tree.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
>
> This is the second take of block-unify-sector-and-data_len patchset.
> The primary goal of this patchset is to consolidate all the similar
> bug slightly different current position and data length fields in
> struct request. For detailed description, please read the description
> in the last take[L]. Changes from the last take[L] are
Looks really nice. Finally, the block insulates the internal! SCSI
did two years ago ;)
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-07 10:23 ` FUJITA Tomonori
@ 2009-05-08 2:06 ` FUJITA Tomonori
2009-05-08 9:11 ` Tejun Heo
0 siblings, 1 reply; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-08 2:06 UTC (permalink / raw)
To: fujita.tomonori
Cc: tj, axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
On Thu, 7 May 2009 19:23:34 +0900
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> On Mon, 4 May 2009 16:58:36 +0900
> Tejun Heo <tj@kernel.org> wrote:
>
> > Hello,
> >
> > Upon ack, please pull from the following git tree.
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
> >
> > This is the second take of block-unify-sector-and-data_len patchset.
> > The primary goal of this patchset is to consolidate all the similar
> > bug slightly different current position and data length fields in
> > struct request. For detailed description, please read the description
> > in the last take[L]. Changes from the last take[L] are
>
> Looks really nice. Finally, the block insulates the internal! SCSI
> did two years ago ;)
btw, you are still working on the cleanups of the block API, right?
I also want to see some cleanups of request completion functions a bit
(e.g. we don't need _bidi_ stuff, we have too many completion
functions, etc...).
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-08 2:06 ` FUJITA Tomonori
@ 2009-05-08 9:11 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-08 9:11 UTC (permalink / raw)
To: FUJITA Tomonori
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
bharrosh
Hello,
FUJITA Tomonori wrote:
> btw, you are still working on the cleanups of the block API, right?
The patchset I sent out today was the last large cleanup patchset I
had waiting. I think I'm now ready to move onto adding new features.
> I also want to see some cleanups of request completion functions a bit
> (e.g. we don't need _bidi_ stuff, we have too many completion
> functions, etc...).
Hmmm... the bidi stuff not being used widely, I didn't pay too much
attention to it. What do you have in mind? Can you elaborate a bit?
We changed the API a lot anyway so if there's more to do doing it now
wouldn't be a bad idea.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-04 7:58 ` Tejun Heo
` (2 preceding siblings ...)
(?)
@ 2009-05-10 14:07 ` Boaz Harrosh
2009-05-10 23:48 ` Tejun Heo
-1 siblings, 1 reply; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-10 14:07 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
On 05/04/2009 10:58 AM, Tejun Heo wrote:
> rq->data_len served two purposes - the length of data buffer on issue
> and the residual count on completion. This duality creates some
> headaches.
>
> First of all, block layer and low level drivers can't really determine
> what rq->data_len contains while a request is executing. It could be
> the total request length or it coulde be anything else one of the
> lower layers is using to keep track of residual count. This
> complicates things because blk_rq_bytes() and thus
> [__]blk_end_request_all() relies on rq->data_len for PC commands.
> Drivers which want to report residual count should first cache the
> total request length, update rq->data_len and then complete the
> request with the cached data length.
>
> Secondly, it makes requests default to reporting full residual count,
> ie. reporting that no data transfer occurred. The residual count is
> an exception not the norm; however, the driver should clear
> rq->data_len to zero to signify the normal cases while leaving it
> alone means no data transfer occurred at all. This reverse default
> behavior complicates code unnecessarily and renders block PC on some
> drivers (ide-tape/floppy) unuseable.
>
> This patch adds rq->resid_len which is used only for residual count.
>
> While at it, remove now unnecessasry blk_rq_bytes() caching in
> ide_pc_intr() as rq->data_len is not changed anymore.
>
> Boaz: spotted missing conversion in osd.
>
> [ Impact: cleanup residual count handling, report 0 resid by default ]
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> Cc: Borislav Petkov <petkovbb@googlemail.com>
> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
> Cc: Mike Miller <mike.miller@hp.com>
> Cc: Eric Moore <Eric.Moore@lsi.com>
> Cc: Alan Stern <stern@rowland.harvard.edu>
> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
> Cc: Doug Gilbert <dgilbert@interlog.com>
> Cc: Mike Miller <mike.miller@hp.com>
> Cc: Eric Moore <Eric.Moore@lsi.com>
> Cc: Darrick J. Wong <djwong@us.ibm.com>
> Cc: Pete Zaitcev <zaitcev@redhat.com>
> Cc: Boaz Harrosh <bharrosh@panasas.com>
> ---
> block/bsg.c | 8 +++---
> block/scsi_ioctl.c | 2 +-
<snip>
> drivers/message/fusion/mptsas.c | 3 +-
> drivers/scsi/libsas/sas_expander.c | 6 +----
> drivers/scsi/libsas/sas_host_smp.c | 38 +++++++++++++++--------------
> drivers/scsi/mpt2sas/mpt2sas_transport.c | 4 +--
> drivers/scsi/scsi_lib.c | 24 +++++++++---------
> drivers/scsi/sg.c | 2 +-
> drivers/scsi/st.c | 2 +-
> fs/exofs/osd.c | 4 +-
> include/linux/blkdev.h | 1 +
> 16 files changed, 59 insertions(+), 80 deletions(-)
>
Hi Tejun, I've carefully reviewed these files which I know more about.
The drivers/block files I've skipped, since I'm not familiar with this code.
Except a small fallout, it looks very good. See some comments plus Ack/review below
Thank you for doing this.
> diff --git a/block/bsg.c b/block/bsg.c
> index 206060e..2d746e3 100644
> --- a/block/bsg.c
> +++ b/block/bsg.c
> @@ -445,14 +445,14 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
> }
>
> if (rq->next_rq) {
> - hdr->dout_resid = rq->data_len;
> - hdr->din_resid = rq->next_rq->data_len;
> + hdr->dout_resid = rq->resid_len;
> + hdr->din_resid = rq->next_rq->resid_len;
> blk_rq_unmap_user(bidi_bio);
> blk_put_request(rq->next_rq);
> } else if (rq_data_dir(rq) == READ)
> - hdr->din_resid = rq->data_len;
> + hdr->din_resid = rq->resid_len;
> else
> - hdr->dout_resid = rq->data_len;
> + hdr->dout_resid = rq->resid_len;
>
> /*
> * If the request generated a negative error number, return it
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
> diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
> index 58cf456..a9670dd 100644
> --- a/block/scsi_ioctl.c
> +++ b/block/scsi_ioctl.c
> @@ -230,7 +230,7 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
> hdr->info = 0;
> if (hdr->masked_status || hdr->host_status || hdr->driver_status)
> hdr->info |= SG_INFO_CHECK;
> - hdr->resid = rq->data_len;
> + hdr->resid = rq->resid_len;
> hdr->sb_len_wr = 0;
>
> if (rq->sense_len && hdr->sbp) {
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
<snip>
> diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
> index a9019f0..5d5f347 100644
> --- a/drivers/message/fusion/mptsas.c
> +++ b/drivers/message/fusion/mptsas.c
> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> memcpy(req->sense, smprep, sizeof(*smprep));
> req->sense_len = sizeof(*smprep);
> - req->data_len = 0;
> - rsp->data_len -= smprep->ResponseDataLength;
> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> } else {
> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> ioc->name, __func__);
I think original code was assuming full residual count on the else side
(not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
+ rsp->resid_len = rsp->data_len;
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index 3da02e4..6605ec9 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> bio_data(rsp->bio), rsp->data_len);
> if (ret > 0) {
> /* positive number is the untransferred residual */
> - rsp->data_len = ret;
> - req->data_len = 0;
> + rsp->resid_len = ret;
> ret = 0;
> - } else if (ret == 0) {
> - rsp->data_len = 0;
> - req->data_len = 0;
> }
>
> return ret;
This is actually a bug fix, as well as a strait conversion
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
> diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
> index d110a36..89952ed 100644
> --- a/drivers/scsi/libsas/sas_host_smp.c
> +++ b/drivers/scsi/libsas/sas_host_smp.c
> @@ -134,7 +134,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> {
> u8 *req_data = NULL, *resp_data = NULL, *buf;
> struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
> - int error = -EINVAL, resp_data_len = rsp->data_len;
> + int error = -EINVAL;
>
> /* eight is the minimum size for request and response frames */
> if (req->data_len < 8 || rsp->data_len < 8)
> @@ -176,17 +176,20 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> resp_data[1] = req_data[1];
> resp_data[2] = SMP_RESP_FUNC_UNK;
>
> + req->resid_len = req->data_len;
> + rsp->resid_len = rsp->data_len;
> +
> switch (req_data[1]) {
> case SMP_REPORT_GENERAL:
> - req->data_len -= 8;
> - resp_data_len -= 32;
> + req->resid_len -= 8;
> + rsp->resid_len -= 32;
> resp_data[2] = SMP_RESP_FUNC_ACC;
> resp_data[9] = sas_ha->num_phys;
> break;
>
> case SMP_REPORT_MANUF_INFO:
> - req->data_len -= 8;
> - resp_data_len -= 64;
> + req->resid_len -= 8;
> + rsp->resid_len -= 64;
> resp_data[2] = SMP_RESP_FUNC_ACC;
> memcpy(resp_data + 12, shost->hostt->name,
> SAS_EXPANDER_VENDOR_ID_LEN);
> @@ -199,13 +202,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> break;
>
> case SMP_DISCOVER:
> - req->data_len -= 16;
> - if ((int)req->data_len < 0) {
> - req->data_len = 0;
> + req->resid_len -= 16;
> + if ((int)req->resid_len < 0) {
> + req->resid_len = 0;
> error = -EINVAL;
> goto out;
> }
> - resp_data_len -= 56;
> + rsp->resid_len -= 56;
> sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
> break;
>
> @@ -215,13 +218,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> break;
>
> case SMP_REPORT_PHY_SATA:
> - req->data_len -= 16;
> - if ((int)req->data_len < 0) {
> - req->data_len = 0;
> + req->resid_len -= 16;
> + if ((int)req->resid_len < 0) {
> + req->resid_len = 0;
> error = -EINVAL;
> goto out;
> }
> - resp_data_len -= 60;
> + rsp->resid_len -= 60;
> sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
> break;
>
> @@ -238,13 +241,13 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> break;
>
> case SMP_PHY_CONTROL:
> - req->data_len -= 44;
> - if ((int)req->data_len < 0) {
> - req->data_len = 0;
> + req->resid_len -= 44;
> + if ((int)req->resid_len < 0) {
> + req->resid_len = 0;
> error = -EINVAL;
> goto out;
> }
> - resp_data_len -= 8;
> + rsp->resid_len -= 8;
> sas_phy_control(sas_ha, req_data[9], req_data[10],
> req_data[32] >> 4, req_data[33] >> 4,
> resp_data);
> @@ -265,7 +268,6 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> flush_kernel_dcache_page(bio_page(rsp->bio));
> kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
> local_irq_enable();
> - rsp->data_len = resp_data_len;
>
> out:
> kfree(req_data);
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
> diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
> index e03dc0b..53759c5 100644
> --- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
> +++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
> @@ -1170,9 +1170,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>
> memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
> req->sense_len = sizeof(*mpi_reply);
> - req->data_len = 0;
> - rsp->data_len -= mpi_reply->ResponseDataLength;
> -
> + rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
> } else {
> dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
> "%s - no reply\n", ioc->name, __func__));
Here it's the same as in mptsas_smp_handler. The else case was returning full
residual count on error, maybe an:
+ rsp->resid_len = rsp->data_len;
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index aa9fc57..7d49ef5 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -240,11 +240,11 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
> * is invalid. Prevent the garbage from being misinterpreted
> * and prevent security leaks by zeroing out the excess data.
> */
> - if (unlikely(req->data_len > 0 && req->data_len <= bufflen))
> - memset(buffer + (bufflen - req->data_len), 0, req->data_len);
> + if (unlikely(req->resid_len > 0 && req->resid_len <= bufflen))
> + memset(buffer + (bufflen - req->resid_len), 0, req->resid_len);
>
> if (resid)
> - *resid = req->data_len;
> + *resid = req->resid_len;
> ret = req->errors;
> out:
> blk_put_request(req);
> @@ -549,7 +549,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
> int leftover = (req->hard_nr_sectors << 9);
>
> if (blk_pc_request(req))
> - leftover = req->data_len;
> + leftover = req->resid_len;
This is the fallout:
The above is just a case of:
- int leftover = (req->hard_nr_sectors << 9);
-
- if (blk_pc_request(req))
- leftover = req->data_len;
+ int leftover = blk_rq_bytes();
Which you separated into to stages, much later right?
>
> /* kill remainder if no retrys */
> if (error && scsi_noretry_cmd(cmd))
> @@ -673,11 +673,11 @@ void scsi_release_buffers(struct scsi_cmnd *cmd)
> EXPORT_SYMBOL(scsi_release_buffers);
>
> /*
> - * Bidi commands Must be complete as a whole, both sides at once.
> - * If part of the bytes were written and lld returned
> - * scsi_in()->resid and/or scsi_out()->resid this information will be left
> - * in req->data_len and req->next_rq->data_len. The upper-layer driver can
> - * decide what to do with this information.
> + * Bidi commands Must be complete as a whole, both sides at once. If
> + * part of the bytes were written and lld returned scsi_in()->resid
> + * and/or scsi_out()->resid this information will be left in
> + * req->resid_len and req->next_rq->resid_len. The upper-layer driver
> + * can decide what to do with this information.
> */
> static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
> {
> @@ -685,8 +685,8 @@ static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
> unsigned int dlen = req->data_len;
> unsigned int next_dlen = req->next_rq->data_len;
>
> - req->data_len = scsi_out(cmd)->resid;
> - req->next_rq->data_len = scsi_in(cmd)->resid;
> + req->resid_len = scsi_out(cmd)->resid;
> + req->next_rq->resid_len = scsi_in(cmd)->resid;
>
> /* The req and req->next_rq have not been completed */
> BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
> @@ -778,7 +778,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
> scsi_end_bidi_request(cmd);
> return;
> }
> - req->data_len = scsi_get_resid(cmd);
> + req->resid_len = scsi_get_resid(cmd);
> }
>
> BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
Except the fallout the rest of scsi_lib looks good, specifically the bidi_parts.
I'll send a farther cleanup to scsi_lib based on this patchset later.
> diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
> index 82312df..dec4c70 100644
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -1260,7 +1260,7 @@ static void sg_rq_end_io(struct request *rq, int uptodate)
>
> sense = rq->sense;
> result = rq->errors;
> - resid = rq->data_len;
> + resid = rq->resid_len;
>
> SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
> sdp->disk->disk_name, srp->header.pack_id, result));
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
> diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
> index eb24efe..8681b70 100644
> --- a/drivers/scsi/st.c
> +++ b/drivers/scsi/st.c
> @@ -463,7 +463,7 @@ static void st_scsi_execute_end(struct request *req, int uptodate)
> struct scsi_tape *STp = SRpnt->stp;
>
> STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
> - STp->buffer->cmdstat.residual = req->data_len;
> + STp->buffer->cmdstat.residual = req->resid_len;
>
> if (SRpnt->waiting)
> complete(SRpnt->waiting);
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
> diff --git a/fs/exofs/osd.c b/fs/exofs/osd.c
> index b249ae9..06ca926 100644
> --- a/fs/exofs/osd.c
> +++ b/fs/exofs/osd.c
> @@ -50,10 +50,10 @@ int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
>
> /* FIXME: should be include in osd_sense_info */
> if (in_resid)
> - *in_resid = or->in.req ? or->in.req->data_len : 0;
> + *in_resid = or->in.req ? or->in.req->resid_len : 0;
>
> if (out_resid)
> - *out_resid = or->out.req ? or->out.req->data_len : 0;
> + *out_resid = or->out.req ? or->out.req->resid_len : 0;
>
> return ret;
> }
Ack-by: Boaz Harrosh <bharrosh@panasas.com>
<snip>
Dear Tejun.
I've started farther cleanup based on your patchset. However I had a merge conflict
when merging your branch with Linus-2.6.30-rc5, around the block areas, do you know
what that might be? I've continued to work based on your branch alone, but will wait and
post it later once things settle.
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-10 14:07 ` Boaz Harrosh
@ 2009-05-10 23:48 ` Tejun Heo
2009-05-11 5:49 ` FUJITA Tomonori
2009-05-11 11:31 ` Boaz Harrosh
0 siblings, 2 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-10 23:48 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
Hello, Boaz.
Boaz Harrosh wrote:
> Hi Tejun, I've carefully reviewed these files which I know more
> about. The drivers/block files I've skipped, since I'm not familiar
> with this code.
>
> Except a small fallout, it looks very good. See some comments plus
> Ack/review below
Thanks a lot for reviewing it closely. It's really nice to have
careful extra pair of eyes on the changes. :-)
>> --- a/drivers/message/fusion/mptsas.c
>> +++ b/drivers/message/fusion/mptsas.c
>> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
>> memcpy(req->sense, smprep, sizeof(*smprep));
>> req->sense_len = sizeof(*smprep);
>> - req->data_len = 0;
>> - rsp->data_len -= smprep->ResponseDataLength;
>> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
>> } else {
>> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
>> ioc->name, __func__);
>
> I think original code was assuming full residual count on the else side
> (not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
>
> + rsp->resid_len = rsp->data_len;
Does resid_len make any sense w/ failed requests? I think we would be
better off with declaring residual count to be undefined on request
failure. Is there any place which depends on it?
That said, the value is eventually exported to userland, so it might
be better to not change it. Eh... I don't know.
>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
>> index 3da02e4..6605ec9 100644
>> --- a/drivers/scsi/libsas/sas_expander.c
>> +++ b/drivers/scsi/libsas/sas_expander.c
>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>> bio_data(rsp->bio), rsp->data_len);
>> if (ret > 0) {
>> /* positive number is the untransferred residual */
>> - rsp->data_len = ret;
>> - req->data_len = 0;
>> + rsp->resid_len = ret;
>> ret = 0;
>> - } else if (ret == 0) {
>> - rsp->data_len = 0;
>> - req->data_len = 0;
>> }
>>
>> return ret;
>
> This is actually a bug fix, as well as a strait conversion
Can you elaborate a bit about the bug fix part?
>> @@ -549,7 +549,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
>> int leftover = (req->hard_nr_sectors << 9);
>>
>> if (blk_pc_request(req))
>> - leftover = req->data_len;
>> + leftover = req->resid_len;
>
> This is the fallout:
>
> The above is just a case of:
>
> - int leftover = (req->hard_nr_sectors << 9);
> -
> - if (blk_pc_request(req))
> - leftover = req->data_len;
> + int leftover = blk_rq_bytes();
>
> Which you separated into to stages, much later right?
Aieee.. yeah, that's one stupid misconversion. That function should
just use blk_end_request_all(). Will fix. Thanks for spotting it.
>> @@ -778,7 +778,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
>> scsi_end_bidi_request(cmd);
>> return;
>> }
>> - req->data_len = scsi_get_resid(cmd);
>> + req->resid_len = scsi_get_resid(cmd);
>> }
>>
>> BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
>
> Except the fallout the rest of scsi_lib looks good, specifically the
> bidi_parts.
>
> I'll send a farther cleanup to scsi_lib based on this patchset later.
Cool.
> I've started farther cleanup based on your patchset. However I had a
> merge conflict when merging your branch with Linus-2.6.30-rc5,
> around the block areas, do you know what that might be? I've
> continued to work based on your branch alone, but will wait and post
> it later once things settle.
I saw a conflict in blkdev.h but there could be other things. I think
it should be fine to just base things on my branch. I or Jens should
be able to handle merge conflicts later.
I'll update the patchset and repost soonish.
Thanks a lot.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-10 23:48 ` Tejun Heo
@ 2009-05-11 5:49 ` FUJITA Tomonori
2009-05-11 14:18 ` James Bottomley
2009-05-11 11:31 ` Boaz Harrosh
1 sibling, 1 reply; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-11 5:49 UTC (permalink / raw)
To: tj
Cc: bharrosh, axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Mon, 11 May 2009 08:48:53 +0900
Tejun Heo <tj@kernel.org> wrote:
> Hello, Boaz.
>
> Boaz Harrosh wrote:
>
> > Hi Tejun, I've carefully reviewed these files which I know more
> > about. The drivers/block files I've skipped, since I'm not familiar
> > with this code.
> >
> > Except a small fallout, it looks very good. See some comments plus
> > Ack/review below
>
> Thanks a lot for reviewing it closely. It's really nice to have
> careful extra pair of eyes on the changes. :-)
>
> >> --- a/drivers/message/fusion/mptsas.c
> >> +++ b/drivers/message/fusion/mptsas.c
> >> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> >> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> >> memcpy(req->sense, smprep, sizeof(*smprep));
> >> req->sense_len = sizeof(*smprep);
> >> - req->data_len = 0;
> >> - rsp->data_len -= smprep->ResponseDataLength;
> >> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> >> } else {
> >> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> >> ioc->name, __func__);
> >
> > I think original code was assuming full residual count on the else side
> > (not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
> >
> > + rsp->resid_len = rsp->data_len;
>
> Does resid_len make any sense w/ failed requests? I think we would be
> better off with declaring residual count to be undefined on request
> failure. Is there any place which depends on it?
IIRC, I wrote the code. I think that this doesn't matter but it's
better not to change the behavior unless Eric ack on this change
(maybe LSI has some management binary that assume this behavior though
it's unlikely).
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-10 23:48 ` Tejun Heo
2009-05-11 5:49 ` FUJITA Tomonori
@ 2009-05-11 11:31 ` Boaz Harrosh
2009-05-11 14:59 ` FUJITA Tomonori
2009-05-12 0:27 ` Tejun Heo
1 sibling, 2 replies; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-11 11:31 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
On 05/11/2009 02:48 AM, Tejun Heo wrote:
>
> Does resid_len make any sense w/ failed requests? I think we would be
> better off with declaring residual count to be undefined on request
> failure. Is there any place which depends on it?
>
> That said, the value is eventually exported to userland, so it might
> be better to not change it. Eh... I don't know.
>
When possible, residual should be exact because the residual amount is not bounced
and might even be zeroed-out for security, as the meaning of residual is that these bytes
are garbage.
>>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
>>> index 3da02e4..6605ec9 100644
>>> --- a/drivers/scsi/libsas/sas_expander.c
>>> +++ b/drivers/scsi/libsas/sas_expander.c
>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>>> bio_data(rsp->bio), rsp->data_len);
>>> if (ret > 0) {
>>> /* positive number is the untransferred residual */
>>> - rsp->data_len = ret;
>>> - req->data_len = 0;
>>> + rsp->resid_len = ret;
>>> ret = 0;
>>> - } else if (ret == 0) {
>>> - rsp->data_len = 0;
>>> - req->data_len = 0;
>>> }
>>>
>>> return ret;
>> This is actually a bug fix, as well as a strait conversion
>
> Can you elaborate a bit about the bug fix part?
>
Nothing big really, just that before (according to the comment), the theoretical
negative case would be full-residual. and now it is zero (untouched).
I know that in iscsi a negative residual is possible which means over-flow. That is:
the target had more data to give then the buffer had space for. (which is not an error at all)
>>> @@ -549,7 +549,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
>>> int leftover = (req->hard_nr_sectors << 9);
>>>
>>> if (blk_pc_request(req))
>>> - leftover = req->data_len;
>>> + leftover = req->resid_len;
>> This is the fallout:
>>
>> The above is just a case of:
>>
>> - int leftover = (req->hard_nr_sectors << 9);
>> -
>> - if (blk_pc_request(req))
>> - leftover = req->data_len;
>> + int leftover = blk_rq_bytes();
>>
>> Which you separated into to stages, much later right?
>
> Aieee.. yeah, that's one stupid misconversion. That function should
> just use blk_end_request_all(). Will fix. Thanks for spotting it.
>
Yes, there is a couple of other places that have that with the meaning of
blk_end_request_all() (Have I commented on one?). Are you doing this conversion
in these patchset? or this is for a second pass?
>
> Thanks a lot.
>
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 08/11] block: cleanup rq->data_len usages
2009-05-04 7:58 ` Tejun Heo
(?)
(?)
@ 2009-05-11 12:02 ` Boaz Harrosh
-1 siblings, 0 replies; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-11 12:02 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Darrick J. Wong
On 05/04/2009 10:58 AM, Tejun Heo wrote:
> With recent unification of fields, it's now guaranteed that
> rq->data_len always equals blk_rq_bytes(). Convert all non-IDE direct
> users to accessors. IDE will be converted in a separate patch.
>
> Boaz: spotted incorrect data_len/resid_len conversion in osd.
>
> [ Impact: convert direct rq->data_len usages to blk_rq_bytes() ]
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Pete Zaitcev <zaitcev@redhat.com>
> Cc: Eric Moore <Eric.Moore@lsi.com>
> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
> Cc: Darrick J. Wong <djwong@us.ibm.com>
> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
> Cc: Eric Moore <Eric.Moore@lsi.com>
> Cc: Boaz Harrosh <bharrosh@panasas.com>
> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
> ---
> drivers/ata/libata-scsi.c | 2 +-
> drivers/block/ub.c | 8 ++++----
> drivers/message/fusion/mptsas.c | 20 ++++++++++----------
> drivers/message/i2o/i2o_block.c | 2 +-
> drivers/scsi/libsas/sas_expander.c | 8 ++++----
> drivers/scsi/libsas/sas_host_smp.c | 18 +++++++++---------
> drivers/scsi/mpt2sas/mpt2sas_transport.c | 21 +++++++++++----------
> drivers/scsi/osd/osd_initiator.c | 4 ++--
> drivers/scsi/scsi_lib.c | 13 ++++++-------
> drivers/scsi/scsi_tgt_lib.c | 2 +-
> 10 files changed, 49 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 2733b0c..6e4c600 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -1084,7 +1084,7 @@ static int atapi_drain_needed(struct request *rq)
> if (likely(!blk_pc_request(rq)))
> return 0;
>
> - if (!rq->data_len || (rq->cmd_flags & REQ_RW))
> + if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW))
> return 0;
>
> return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
> diff --git a/drivers/block/ub.c b/drivers/block/ub.c
> index dc3b899..1591f61 100644
> --- a/drivers/block/ub.c
> +++ b/drivers/block/ub.c
> @@ -747,7 +747,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
> {
> struct request *rq = urq->rq;
>
> - if (rq->data_len == 0) {
> + if (blk_rq_bytes(rq) == 0) {
> cmd->dir = UB_DIR_NONE;
> } else {
> if (rq_data_dir(rq) == WRITE)
> @@ -762,7 +762,7 @@ static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
> memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
> cmd->cdb_len = rq->cmd_len;
>
> - cmd->len = rq->data_len;
> + cmd->len = blk_rq_bytes(rq);
>
> /*
> * To reapply this to every URB is not as incorrect as it looks.
> @@ -783,8 +783,8 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
>
> if (cmd->error == 0) {
> if (blk_pc_request(rq)) {
> - if (cmd->act_len < rq->data_len)
> - rq->resid_len = rq->data_len - cmd->act_len;
> + if (cmd->act_len < blk_rq_bytes(rq))
> + rq->resid_len = blk_rq_bytes(rq) - cmd->act_len;
> scsi_status = 0;
> } else {
> if (cmd->act_len != cmd->len) {
> diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
> index 5d5f347..4e6fcf0 100644
> --- a/drivers/message/fusion/mptsas.c
> +++ b/drivers/message/fusion/mptsas.c
> @@ -1277,8 +1277,8 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> /* do we need to support multiple segments? */
> if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
> printk(MYIOC_s_ERR_FMT "%s: multiple segments req %u %u, rsp %u %u\n",
> - ioc->name, __func__, req->bio->bi_vcnt, req->data_len,
> - rsp->bio->bi_vcnt, rsp->data_len);
> + ioc->name, __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
> + rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
> return -EINVAL;
> }
>
> @@ -1295,7 +1295,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> smpreq = (SmpPassthroughRequest_t *)mf;
> memset(smpreq, 0, sizeof(*smpreq));
>
> - smpreq->RequestDataLength = cpu_to_le16(req->data_len - 4);
> + smpreq->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
> smpreq->Function = MPI_FUNCTION_SMP_PASSTHROUGH;
>
> if (rphy)
> @@ -1321,10 +1321,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> MPI_SGE_FLAGS_END_OF_BUFFER |
> MPI_SGE_FLAGS_DIRECTION |
> mpt_addr_size()) << MPI_SGE_FLAGS_SHIFT;
> - flagsLength |= (req->data_len - 4);
> + flagsLength |= (blk_rq_bytes(req) - 4);
>
> dma_addr_out = pci_map_single(ioc->pcidev, bio_data(req->bio),
> - req->data_len, PCI_DMA_BIDIRECTIONAL);
> + blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
> if (!dma_addr_out)
> goto put_mf;
> mpt_add_sge(psge, flagsLength, dma_addr_out);
> @@ -1332,9 +1332,9 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>
> /* response */
> flagsLength = MPT_SGE_FLAGS_SSIMPLE_READ;
> - flagsLength |= rsp->data_len + 4;
> + flagsLength |= blk_rq_bytes(rsp) + 4;
> dma_addr_in = pci_map_single(ioc->pcidev, bio_data(rsp->bio),
> - rsp->data_len, PCI_DMA_BIDIRECTIONAL);
> + blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
> if (!dma_addr_in)
> goto unmap;
> mpt_add_sge(psge, flagsLength, dma_addr_in);
> @@ -1357,7 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> memcpy(req->sense, smprep, sizeof(*smprep));
> req->sense_len = sizeof(*smprep);
> - rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> + rsp->resid_len = blk_rq_bytes(rsp) - smprep->ResponseDataLength;
> } else {
> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> ioc->name, __func__);
> @@ -1365,10 +1365,10 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> }
> unmap:
> if (dma_addr_out)
> - pci_unmap_single(ioc->pcidev, dma_addr_out, req->data_len,
> + pci_unmap_single(ioc->pcidev, dma_addr_out, blk_rq_bytes(req),
> PCI_DMA_BIDIRECTIONAL);
> if (dma_addr_in)
> - pci_unmap_single(ioc->pcidev, dma_addr_in, rsp->data_len,
> + pci_unmap_single(ioc->pcidev, dma_addr_in, blk_rq_bytes(rsp),
> PCI_DMA_BIDIRECTIONAL);
> put_mf:
> if (mf)
> diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
> index 510eb47..6b61d28 100644
> --- a/drivers/message/i2o/i2o_block.c
> +++ b/drivers/message/i2o/i2o_block.c
> @@ -430,7 +430,7 @@ static void i2o_block_end_request(struct request *req, int error,
> int leftover = (blk_rq_sectors(req) << KERNEL_SECTOR_SHIFT);
>
> if (blk_pc_request(req))
> - leftover = req->data_len;
> + leftover = blk_rq_bytes(req);
>
> if (error)
> blk_end_request(req, -EIO, leftover);
Note:
This can be blk_end_request_all() and "int leftover =" dropped.
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index 6605ec9..531af9e 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -1927,13 +1927,13 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> /* do we need to support multiple segments? */
> if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
> printk("%s: multiple segments req %u %u, rsp %u %u\n",
> - __func__, req->bio->bi_vcnt, req->data_len,
> - rsp->bio->bi_vcnt, rsp->data_len);
> + __func__, req->bio->bi_vcnt, blk_rq_bytes(req),
> + rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
> return -EINVAL;
> }
>
> - ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
> - bio_data(rsp->bio), rsp->data_len);
> + ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
> + bio_data(rsp->bio), blk_rq_bytes(rsp));
> if (ret > 0) {
> /* positive number is the untransferred residual */
> rsp->resid_len = ret;
> diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
> index 89952ed..be9a951 100644
> --- a/drivers/scsi/libsas/sas_host_smp.c
> +++ b/drivers/scsi/libsas/sas_host_smp.c
> @@ -137,21 +137,21 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> int error = -EINVAL;
>
> /* eight is the minimum size for request and response frames */
> - if (req->data_len < 8 || rsp->data_len < 8)
> + if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
> goto out;
>
> - if (bio_offset(req->bio) + req->data_len > PAGE_SIZE ||
> - bio_offset(rsp->bio) + rsp->data_len > PAGE_SIZE) {
> + if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
> + bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
> shost_printk(KERN_ERR, shost,
> "SMP request/response frame crosses page boundary");
> goto out;
> }
>
> - req_data = kzalloc(req->data_len, GFP_KERNEL);
> + req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
>
> /* make sure frame can always be built ... we copy
> * back only the requested length */
> - resp_data = kzalloc(max(rsp->data_len, 128U), GFP_KERNEL);
> + resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
>
> if (!req_data || !resp_data) {
> error = -ENOMEM;
> @@ -160,7 +160,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
>
> local_irq_disable();
> buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
> - memcpy(req_data, buf, req->data_len);
> + memcpy(req_data, buf, blk_rq_bytes(req));
> kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
> local_irq_enable();
>
> @@ -176,8 +176,8 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
> resp_data[1] = req_data[1];
> resp_data[2] = SMP_RESP_FUNC_UNK;
>
> - req->resid_len = req->data_len;
> - rsp->resid_len = rsp->data_len;
> + req->resid_len = blk_rq_bytes(req);
> + rsp->resid_len = blk_rq_bytes(rsp);
>
> switch (req_data[1]) {
> case SMP_REPORT_GENERAL:
> @@ -264,7 +264,7 @@ int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
>
> local_irq_disable();
> buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
> - memcpy(buf, resp_data, rsp->data_len);
> + memcpy(buf, resp_data, blk_rq_bytes(rsp));
> flush_kernel_dcache_page(bio_page(rsp->bio));
> kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
> local_irq_enable();
> diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
> index 53759c5..af95a44 100644
> --- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
> +++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
> @@ -1041,7 +1041,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
> printk(MPT2SAS_ERR_FMT "%s: multiple segments req %u %u, "
> "rsp %u %u\n", ioc->name, __func__, req->bio->bi_vcnt,
> - req->data_len, rsp->bio->bi_vcnt, rsp->data_len);
> + blk_rq_bytes(req), rsp->bio->bi_vcnt, blk_rq_bytes(rsp));
> return -EINVAL;
> }
>
> @@ -1104,7 +1104,7 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> *((u64 *)&mpi_request->SASAddress) = (rphy) ?
> cpu_to_le64(rphy->identify.sas_address) :
> cpu_to_le64(ioc->sas_hba.sas_address);
> - mpi_request->RequestDataLength = cpu_to_le16(req->data_len - 4);
> + mpi_request->RequestDataLength = cpu_to_le16(blk_rq_bytes(req) - 4);
> psge = &mpi_request->SGL;
>
> /* WRITE sgel first */
> @@ -1112,13 +1112,13 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
> sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
> dma_addr_out = pci_map_single(ioc->pdev, bio_data(req->bio),
> - req->data_len, PCI_DMA_BIDIRECTIONAL);
> + blk_rq_bytes(req), PCI_DMA_BIDIRECTIONAL);
> if (!dma_addr_out) {
> mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
> goto unmap;
> }
>
> - ioc->base_add_sg_single(psge, sgl_flags | (req->data_len - 4),
> + ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(req) - 4),
> dma_addr_out);
>
> /* incr sgel */
> @@ -1129,14 +1129,14 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
> MPI2_SGE_FLAGS_END_OF_LIST);
> sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
> - dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
> - rsp->data_len, PCI_DMA_BIDIRECTIONAL);
> + dma_addr_in = pci_map_single(ioc->pdev, bio_data(rsp->bio),
> + blk_rq_bytes(rsp), PCI_DMA_BIDIRECTIONAL);
> if (!dma_addr_in) {
> mpt2sas_base_free_smid(ioc, le16_to_cpu(smid));
> goto unmap;
> }
>
> - ioc->base_add_sg_single(psge, sgl_flags | (rsp->data_len + 4),
> + ioc->base_add_sg_single(psge, sgl_flags | (blk_rq_bytes(rsp) + 4),
> dma_addr_in);
>
> dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s - "
> @@ -1170,7 +1170,8 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>
> memcpy(req->sense, mpi_reply, sizeof(*mpi_reply));
> req->sense_len = sizeof(*mpi_reply);
> - rsp->resid_len = rsp->data_len - mpi_reply->ResponseDataLength;
> + rsp->resid_len = blk_rq_bytes(rsp) -
> + mpi_reply->ResponseDataLength;
> } else {
> dtransportprintk(ioc, printk(MPT2SAS_DEBUG_FMT
> "%s - no reply\n", ioc->name, __func__));
> @@ -1186,10 +1187,10 @@ transport_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>
> unmap:
> if (dma_addr_out)
> - pci_unmap_single(ioc->pdev, dma_addr_out, req->data_len,
> + pci_unmap_single(ioc->pdev, dma_addr_out, blk_rq_bytes(req),
> PCI_DMA_BIDIRECTIONAL);
> if (dma_addr_in)
> - pci_unmap_single(ioc->pdev, dma_addr_in, rsp->data_len,
> + pci_unmap_single(ioc->pdev, dma_addr_in, blk_rq_bytes(rsp),
> PCI_DMA_BIDIRECTIONAL);
>
> out:
> diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
> index 2a5f077..d178a8b 100644
> --- a/drivers/scsi/osd/osd_initiator.c
> +++ b/drivers/scsi/osd/osd_initiator.c
> @@ -1299,7 +1299,7 @@ int osd_finalize_request(struct osd_request *or,
> return ret;
> }
> OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n",
> - _LLU(or->out.total_bytes), or->out.req->data_len);
> + _LLU(or->out.total_bytes), blk_rq_bytes(or->out.req));
> }
> if (or->in.bio) {
> ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio);
> @@ -1308,7 +1308,7 @@ int osd_finalize_request(struct osd_request *or,
> return ret;
> }
> OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n",
> - _LLU(or->in.total_bytes), or->in.req->data_len);
> + _LLU(or->in.total_bytes), blk_rq_bytes(or->in.req));
> }
>
> or->out.pad_buff = sg_out_pad_buffer;
Ack-by: Boaz Harrosh <bharrosh@panasas.com>
Stupid prints. I'll Q a patch that removes them once this is accepted.
Thanks.
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 39b3acf..3d16c70 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -682,14 +682,13 @@ EXPORT_SYMBOL(scsi_release_buffers);
> static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
> {
> struct request *req = cmd->request;
> - unsigned int dlen = req->data_len;
> - unsigned int next_dlen = req->next_rq->data_len;
>
> req->resid_len = scsi_out(cmd)->resid;
> req->next_rq->resid_len = scsi_in(cmd)->resid;
>
> /* The req and req->next_rq have not been completed */
> - BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
> + BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req),
> + blk_rq_bytes(req->next_rq)));
>
> scsi_release_buffers(cmd);
>
> @@ -966,7 +965,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb,
> BUG_ON(count > sdb->table.nents);
> sdb->table.nents = count;
> if (blk_pc_request(req))
> - sdb->length = req->data_len;
> + sdb->length = blk_rq_bytes(req);
> else
> sdb->length = blk_rq_sectors(req) << 9;
> return BLKPREP_OK;
> @@ -1087,21 +1086,21 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
> if (unlikely(ret))
> return ret;
> } else {
> - BUG_ON(req->data_len);
> + BUG_ON(blk_rq_bytes(req));
>
> memset(&cmd->sdb, 0, sizeof(cmd->sdb));
> req->buffer = NULL;
> }
>
> cmd->cmd_len = req->cmd_len;
> - if (!req->data_len)
> + if (!blk_rq_bytes(req))
> cmd->sc_data_direction = DMA_NONE;
> else if (rq_data_dir(req) == WRITE)
> cmd->sc_data_direction = DMA_TO_DEVICE;
> else
> cmd->sc_data_direction = DMA_FROM_DEVICE;
>
> - cmd->transfersize = req->data_len;
> + cmd->transfersize = blk_rq_bytes(req);
> cmd->allowed = req->retries;
> return BLKPREP_OK;
> }
Reviewed-by: Boaz Harrosh <bharrosh@panasas.com>
> diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
> index 48ba413..1030327 100644
> --- a/drivers/scsi/scsi_tgt_lib.c
> +++ b/drivers/scsi/scsi_tgt_lib.c
> @@ -387,7 +387,7 @@ static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
> * we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
> * length for us.
> */
> - cmd->sdb.length = rq->data_len;
> + cmd->sdb.length = blk_rq_bytes(rq);
Note to self:
This code and the comment is wrong scsi_init_io does set everything right. It should be dropped.
Once everything settles, I'll send a patch to remove this.
>
> return 0;
>
I've reviewed all the scsi parts.
(We had a 24 hours internet outage so these replys where delayed)
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-04 7:58 ` Tejun Heo
` (13 preceding siblings ...)
(?)
@ 2009-05-11 12:06 ` Boaz Harrosh
2009-05-12 0:49 ` Tejun Heo
-1 siblings, 1 reply; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-11 12:06 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel
On 05/04/2009 10:58 AM, Tejun Heo wrote:
> Hello,
>
> Upon ack, please pull from the following git tree.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-unify-sector-and-data_len
>
> This is the second take of block-unify-sector-and-data_len patchset.
> The primary goal of this patchset is to consolidate all the similar
> bug slightly different current position and data length fields in
> struct request. For detailed description, please read the description
> in the last take[L]. Changes from the last take[L] are
>
> * Acked-by:'s added
>
> * osd resid_len conversion was missing as pointed out by Boaz Harrosh,
> fixed.
>
> * patch to cleanup request length accessor usages after the conversion
> added.
>
> This patchset contains the following eleven patches.
>
> 0001-nbd-don-t-clear-rq-sector-and-nr_sectors-unnecessa.patch
> 0002-ide-tape-don-t-initialize-rq-sector-for-rw-request.patch
> 0003-block-add-rq-resid_len.patch
> 0004-block-implement-blk_rq_pos-cur_-sectors-and-conv.patch
> 0005-block-convert-to-pos-and-nr_sectors-accessors.patch
> 0006-ide-convert-to-rq-pos-and-nr_sectors-accessors.patch
> 0007-block-drop-request-hard_-and-nr_sectors.patch
> 0008-block-cleanup-rq-data_len-usages.patch
> 0009-ide-cleanup-rq-data_len-usages.patch
> 0010-block-hide-request-sector-and-data_len.patch
> 0011-block-blk_rq_-cur_-_-sectors-bytes-usage-cleanup.patch
>
> This patchset is on top of
>
> linux-2.6-block#for-2.6.31 (f68adec3c7155a8bbf32a90cb4c4d0737df045d9)
> + linux-2.6-ide#for-next (03682411b1ccd38cbde2e9a6ab43884ff34fbefc)
>
> and contains the following changes.
>
> arch/um/drivers/ubd_kern.c | 2
> block/as-iosched.c | 18 +++--
> block/blk-barrier.c | 4 -
> block/blk-core.c | 100 ++++++++++++-------------------
> block/blk-map.c | 2
> block/blk-merge.c | 46 ++------------
> block/blk.h | 1
> block/bsg.c | 8 +-
> block/cfq-iosched.c | 30 ++++-----
> block/deadline-iosched.c | 2
> block/elevator.c | 22 +++---
> block/scsi_ioctl.c | 2
> drivers/ata/libata-scsi.c | 2
> drivers/block/DAC960.c | 6 -
> drivers/block/amiflop.c | 6 -
> drivers/block/ataflop.c | 10 +--
> drivers/block/cciss.c | 35 ++++------
> drivers/block/cpqarray.c | 9 +-
> drivers/block/floppy.c | 54 ++++++++--------
> drivers/block/hd.c | 14 ++--
> drivers/block/nbd.c | 19 +----
> drivers/block/paride/pcd.c | 4 -
> drivers/block/paride/pd.c | 8 +-
> drivers/block/paride/pf.c | 8 +-
> drivers/block/ps3disk.c | 9 +-
> drivers/block/sunvdc.c | 2
> drivers/block/swim3.c | 34 +++++-----
> drivers/block/sx8.c | 6 -
> drivers/block/ub.c | 16 ++--
> drivers/block/viodasd.c | 8 +-
> drivers/block/virtio_blk.c | 2
> drivers/block/xd.c | 4 -
> drivers/block/xen-blkfront.c | 11 +--
> drivers/block/xsysace.c | 25 ++++---
> drivers/block/z2ram.c | 6 -
> drivers/cdrom/gdrom.c | 6 -
> drivers/cdrom/viocd.c | 2
> drivers/ide/ide-atapi.c | 13 ----
> drivers/ide/ide-cd.c | 44 ++++---------
> drivers/ide/ide-disk.c | 8 +-
> drivers/ide/ide-dma.c | 2
> drivers/ide/ide-floppy.c | 10 +--
> drivers/ide/ide-io.c | 10 +--
> drivers/ide/ide-lib.c | 2
> drivers/ide/ide-tape.c | 11 +--
> drivers/ide/ide-taskfile.c | 2
> drivers/ide/pdc202xx_old.c | 2
> drivers/ide/tc86c001.c | 2
> drivers/ide/tx4939ide.c | 2
> drivers/memstick/core/mspro_block.c | 6 -
> drivers/message/fusion/mptsas.c | 21 +++---
> drivers/message/i2o/i2o_block.c | 28 +++-----
> drivers/mmc/card/block.c | 10 +--
> drivers/mtd/mtd_blkdevs.c | 7 +-
> drivers/s390/block/dasd.c | 2
> drivers/s390/block/dasd_diag.c | 5 -
> drivers/s390/block/dasd_eckd.c | 6 -
> drivers/s390/block/dasd_fba.c | 7 +-
> drivers/s390/char/tape_34xx.c | 2
> drivers/s390/char/tape_3590.c | 2
> drivers/s390/char/tape_block.c | 2
> drivers/sbus/char/jsflash.c | 4 -
> drivers/scsi/eata.c | 24 +++----
> drivers/scsi/libsas/sas_expander.c | 14 +---
> drivers/scsi/libsas/sas_host_smp.c | 52 ++++++++--------
> drivers/scsi/lpfc/lpfc_scsi.c | 22 +++---
> drivers/scsi/mpt2sas/mpt2sas_transport.c | 23 +++----
> drivers/scsi/osd/osd_initiator.c | 4 -
> drivers/scsi/scsi_lib.c | 46 ++++++--------
> drivers/scsi/scsi_tgt_lib.c | 2
> drivers/scsi/sd.c | 24 +++----
> drivers/scsi/sd_dif.c | 2
> drivers/scsi/sg.c | 2
> drivers/scsi/sr.c | 15 ++--
> drivers/scsi/st.c | 2
> drivers/scsi/u14-34f.c | 22 +++---
> fs/exofs/osd.c | 4 -
> include/linux/bio.h | 6 -
> include/linux/blkdev.h | 56 ++++++++++-------
> include/linux/elevator.h | 2
> include/scsi/scsi_cmnd.h | 2
> kernel/trace/blktrace.c | 16 ++--
> 82 files changed, 508 insertions(+), 585 deletions(-)
>
> Thanks.
>
> --
> tejun
>
> [L] http://lkml.org/lkml/2009/4/29/173
Hi Tejun
I've inspected all scsi touching patches and refrained from comments
on the simple rename bunch. They all look very good accept that one
place. (which will effect 2 patches)
There are few more places that can use blk_end_request_all() after
these changes.
(The same internet outage on this reply)
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 5:49 ` FUJITA Tomonori
@ 2009-05-11 14:18 ` James Bottomley
2009-05-11 15:03 ` FUJITA Tomonori
2009-05-12 0:19 ` Tejun Heo
0 siblings, 2 replies; 73+ messages in thread
From: James Bottomley @ 2009-05-11 14:18 UTC (permalink / raw)
To: FUJITA Tomonori
Cc: tj, bharrosh, axboe, linux-kernel, jeff, linux-ide, linux-scsi,
bzolnier, petkovbb, sshtylyov, mike.miller, Eric.Moore, stern,
zaitcev, Geert.Uytterhoeven, sfr, grant.likely, paul.clements,
tim, jeremy, adrian, oakad, dwmw2, schwidefsky, ballabio_dario,
davem, rusty, Markus.Lidel, dgilbert, djwong
On Mon, 2009-05-11 at 14:49 +0900, FUJITA Tomonori wrote:
> On Mon, 11 May 2009 08:48:53 +0900
> Tejun Heo <tj@kernel.org> wrote:
>
> > Hello, Boaz.
> >
> > Boaz Harrosh wrote:
> >
> > > Hi Tejun, I've carefully reviewed these files which I know more
> > > about. The drivers/block files I've skipped, since I'm not familiar
> > > with this code.
> > >
> > > Except a small fallout, it looks very good. See some comments plus
> > > Ack/review below
> >
> > Thanks a lot for reviewing it closely. It's really nice to have
> > careful extra pair of eyes on the changes. :-)
> >
> > >> --- a/drivers/message/fusion/mptsas.c
> > >> +++ b/drivers/message/fusion/mptsas.c
> > >> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> > >> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> > >> memcpy(req->sense, smprep, sizeof(*smprep));
> > >> req->sense_len = sizeof(*smprep);
> > >> - req->data_len = 0;
> > >> - rsp->data_len -= smprep->ResponseDataLength;
> > >> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> > >> } else {
> > >> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> > >> ioc->name, __func__);
> > >
> > > I think original code was assuming full residual count on the else side
> > > (not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
> > >
> > > + rsp->resid_len = rsp->data_len;
> >
> > Does resid_len make any sense w/ failed requests? I think we would be
> > better off with declaring residual count to be undefined on request
> > failure. Is there any place which depends on it?
>
> IIRC, I wrote the code. I think that this doesn't matter but it's
> better not to change the behavior unless Eric ack on this change
> (maybe LSI has some management binary that assume this behavior though
> it's unlikely).
Actually, yes it does, for many possible reasons.
The first being if the device is too stupid to report an actual sector
location the next best way of determining where the error occurred is
from the residual. We don't make use of this in kernel (perhaps we
should?) but some of the user space programs for CD/DVD burning do.
James
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 11:31 ` Boaz Harrosh
@ 2009-05-11 14:59 ` FUJITA Tomonori
2009-05-12 8:58 ` Boaz Harrosh
2009-05-12 0:27 ` Tejun Heo
1 sibling, 1 reply; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-11 14:59 UTC (permalink / raw)
To: bharrosh
Cc: tj, axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Mon, 11 May 2009 14:31:41 +0300
Boaz Harrosh <bharrosh@panasas.com> wrote:
> >>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> >>> index 3da02e4..6605ec9 100644
> >>> --- a/drivers/scsi/libsas/sas_expander.c
> >>> +++ b/drivers/scsi/libsas/sas_expander.c
> >>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> >>> bio_data(rsp->bio), rsp->data_len);
> >>> if (ret > 0) {
> >>> /* positive number is the untransferred residual */
> >>> - rsp->data_len = ret;
> >>> - req->data_len = 0;
> >>> + rsp->resid_len = ret;
> >>> ret = 0;
> >>> - } else if (ret == 0) {
> >>> - rsp->data_len = 0;
> >>> - req->data_len = 0;
> >>> }
> >>>
> >>> return ret;
> >> This is actually a bug fix, as well as a strait conversion
> >
> > Can you elaborate a bit about the bug fix part?
> >
>
> Nothing big really, just that before (according to the comment), the theoretical
> negative case would be full-residual. and now it is zero (untouched).
>
> I know that in iscsi a negative residual is possible which means over-flow. That is:
> the target had more data to give then the buffer had space for. (which is not an error at all)
Hmm, iSCSI? This code is for SAS management Protocol.
smp_execute_task returns a negative value for some errors (ENOMEM, the
hardware doesn't respond, etc). It's not related with 'transferred
buffer length' at all.
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 14:18 ` James Bottomley
@ 2009-05-11 15:03 ` FUJITA Tomonori
2009-05-11 15:13 ` James Bottomley
2009-05-12 0:19 ` Tejun Heo
1 sibling, 1 reply; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-11 15:03 UTC (permalink / raw)
To: James.Bottomley
Cc: fujita.tomonori, tj, bharrosh, axboe, linux-kernel, jeff,
linux-ide, linux-scsi, bzolnier, petkovbb, sshtylyov,
mike.miller, Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Mon, 11 May 2009 09:18:20 -0500
James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
> On Mon, 2009-05-11 at 14:49 +0900, FUJITA Tomonori wrote:
> > On Mon, 11 May 2009 08:48:53 +0900
> > Tejun Heo <tj@kernel.org> wrote:
> >
> > > Hello, Boaz.
> > >
> > > Boaz Harrosh wrote:
> > >
> > > > Hi Tejun, I've carefully reviewed these files which I know more
> > > > about. The drivers/block files I've skipped, since I'm not familiar
> > > > with this code.
> > > >
> > > > Except a small fallout, it looks very good. See some comments plus
> > > > Ack/review below
> > >
> > > Thanks a lot for reviewing it closely. It's really nice to have
> > > careful extra pair of eyes on the changes. :-)
> > >
> > > >> --- a/drivers/message/fusion/mptsas.c
> > > >> +++ b/drivers/message/fusion/mptsas.c
> > > >> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> > > >> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> > > >> memcpy(req->sense, smprep, sizeof(*smprep));
> > > >> req->sense_len = sizeof(*smprep);
> > > >> - req->data_len = 0;
> > > >> - rsp->data_len -= smprep->ResponseDataLength;
> > > >> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> > > >> } else {
> > > >> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> > > >> ioc->name, __func__);
> > > >
> > > > I think original code was assuming full residual count on the else side
> > > > (not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
> > > >
> > > > + rsp->resid_len = rsp->data_len;
> > >
> > > Does resid_len make any sense w/ failed requests? I think we would be
> > > better off with declaring residual count to be undefined on request
> > > failure. Is there any place which depends on it?
> >
> > IIRC, I wrote the code. I think that this doesn't matter but it's
> > better not to change the behavior unless Eric ack on this change
> > (maybe LSI has some management binary that assume this behavior though
> > it's unlikely).
>
> Actually, yes it does, for many possible reasons.
>
> The first being if the device is too stupid to report an actual sector
> location the next best way of determining where the error occurred is
> from the residual. We don't make use of this in kernel (perhaps we
> should?) but some of the user space programs for CD/DVD burning do.
This function is for SAS management protocol. Are there many possible
reasons?
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 15:03 ` FUJITA Tomonori
@ 2009-05-11 15:13 ` James Bottomley
2009-05-11 23:47 ` FUJITA Tomonori
0 siblings, 1 reply; 73+ messages in thread
From: James Bottomley @ 2009-05-11 15:13 UTC (permalink / raw)
To: FUJITA Tomonori
Cc: tj, bharrosh, axboe, linux-kernel, jeff, linux-ide, linux-scsi,
bzolnier, petkovbb, sshtylyov, mike.miller, Eric.Moore, stern,
zaitcev, Geert.Uytterhoeven, sfr, grant.likely, paul.clements,
tim, jeremy, adrian, oakad, dwmw2, schwidefsky, ballabio_dario,
davem, rusty, Markus.Lidel, dgilbert, djwong
On Mon, 2009-05-11 at 08:03 -0700, FUJITA Tomonori wrote:
> On Mon, 11 May 2009 09:18:20 -0500
> James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
>
> > On Mon, 2009-05-11 at 14:49 +0900, FUJITA Tomonori wrote:
> > > On Mon, 11 May 2009 08:48:53 +0900
> > > Tejun Heo <tj@kernel.org> wrote:
> > >
> > > > Hello, Boaz.
> > > >
> > > > Boaz Harrosh wrote:
> > > >
> > > > > Hi Tejun, I've carefully reviewed these files which I know more
> > > > > about. The drivers/block files I've skipped, since I'm not familiar
> > > > > with this code.
> > > > >
> > > > > Except a small fallout, it looks very good. See some comments plus
> > > > > Ack/review below
> > > >
> > > > Thanks a lot for reviewing it closely. It's really nice to have
> > > > careful extra pair of eyes on the changes. :-)
> > > >
> > > > >> --- a/drivers/message/fusion/mptsas.c
> > > > >> +++ b/drivers/message/fusion/mptsas.c
> > > > >> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> > > > >> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> > > > >> memcpy(req->sense, smprep, sizeof(*smprep));
> > > > >> req->sense_len = sizeof(*smprep);
> > > > >> - req->data_len = 0;
> > > > >> - rsp->data_len -= smprep->ResponseDataLength;
> > > > >> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> > > > >> } else {
> > > > >> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> > > > >> ioc->name, __func__);
> > > > >
> > > > > I think original code was assuming full residual count on the else side
> > > > > (not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
> > > > >
> > > > > + rsp->resid_len = rsp->data_len;
> > > >
> > > > Does resid_len make any sense w/ failed requests? I think we would be
> > > > better off with declaring residual count to be undefined on request
> > > > failure. Is there any place which depends on it?
> > >
> > > IIRC, I wrote the code. I think that this doesn't matter but it's
> > > better not to change the behavior unless Eric ack on this change
> > > (maybe LSI has some management binary that assume this behavior though
> > > it's unlikely).
> >
> > Actually, yes it does, for many possible reasons.
> >
> > The first being if the device is too stupid to report an actual sector
> > location the next best way of determining where the error occurred is
> > from the residual. We don't make use of this in kernel (perhaps we
> > should?) but some of the user space programs for CD/DVD burning do.
>
> This function is for SAS management protocol. Are there many possible
> reasons?
It still indicates how much of the frame was transferred and we have the
information, so why not set it. Not doing so would be different from
other data transfer functions and so violate the principle of least
surprise.
For SAS 1.1 ... the frames are small, so it's not that relevant. For
SAS 2.0 the SMP functions become multi-frame, so I could see this
becoming relevant for some of the zone SMP commands.
James
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 15:13 ` James Bottomley
@ 2009-05-11 23:47 ` FUJITA Tomonori
0 siblings, 0 replies; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-11 23:47 UTC (permalink / raw)
To: James.Bottomley
Cc: fujita.tomonori, tj, bharrosh, axboe, linux-kernel, jeff,
linux-ide, linux-scsi, bzolnier, petkovbb, sshtylyov,
mike.miller, Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Mon, 11 May 2009 10:13:29 -0500
James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
> On Mon, 2009-05-11 at 08:03 -0700, FUJITA Tomonori wrote:
> > On Mon, 11 May 2009 09:18:20 -0500
> > James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
> >
> > > On Mon, 2009-05-11 at 14:49 +0900, FUJITA Tomonori wrote:
> > > > On Mon, 11 May 2009 08:48:53 +0900
> > > > Tejun Heo <tj@kernel.org> wrote:
> > > >
> > > > > Hello, Boaz.
> > > > >
> > > > > Boaz Harrosh wrote:
> > > > >
> > > > > > Hi Tejun, I've carefully reviewed these files which I know more
> > > > > > about. The drivers/block files I've skipped, since I'm not familiar
> > > > > > with this code.
> > > > > >
> > > > > > Except a small fallout, it looks very good. See some comments plus
> > > > > > Ack/review below
> > > > >
> > > > > Thanks a lot for reviewing it closely. It's really nice to have
> > > > > careful extra pair of eyes on the changes. :-)
> > > > >
> > > > > >> --- a/drivers/message/fusion/mptsas.c
> > > > > >> +++ b/drivers/message/fusion/mptsas.c
> > > > > >> @@ -1357,8 +1357,7 @@ static int mptsas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> > > > > >> smprep = (SmpPassthroughReply_t *)ioc->sas_mgmt.reply;
> > > > > >> memcpy(req->sense, smprep, sizeof(*smprep));
> > > > > >> req->sense_len = sizeof(*smprep);
> > > > > >> - req->data_len = 0;
> > > > > >> - rsp->data_len -= smprep->ResponseDataLength;
> > > > > >> + rsp->resid_len = rsp->data_len - smprep->ResponseDataLength;
> > > > > >> } else {
> > > > > >> printk(MYIOC_s_ERR_FMT "%s: smp passthru reply failed to be returned\n",
> > > > > >> ioc->name, __func__);
> > > > > >
> > > > > > I think original code was assuming full residual count on the else side
> > > > > > (not MPT_IOCTL_STATUS_RF_VALID). So maybe add:
> > > > > >
> > > > > > + rsp->resid_len = rsp->data_len;
> > > > >
> > > > > Does resid_len make any sense w/ failed requests? I think we would be
> > > > > better off with declaring residual count to be undefined on request
> > > > > failure. Is there any place which depends on it?
> > > >
> > > > IIRC, I wrote the code. I think that this doesn't matter but it's
> > > > better not to change the behavior unless Eric ack on this change
> > > > (maybe LSI has some management binary that assume this behavior though
> > > > it's unlikely).
> > >
> > > Actually, yes it does, for many possible reasons.
> > >
> > > The first being if the device is too stupid to report an actual sector
> > > location the next best way of determining where the error occurred is
> > > from the residual. We don't make use of this in kernel (perhaps we
> > > should?) but some of the user space programs for CD/DVD burning do.
> >
> > This function is for SAS management protocol. Are there many possible
> > reasons?
>
> It still indicates how much of the frame was transferred and we have the
> information, so why not set it. Not doing so would be different from
> other data transfer functions and so violate the principle of least
> surprise.
As I wrote in the first reply, I agree with you. I wrote the original
code in that way. I was just curious to know if there are example
applications that could be broken due to this behavior.
> For SAS 1.1 ... the frames are small, so it's not that relevant. For
> SAS 2.0 the SMP functions become multi-frame, so I could see this
> becoming relevant for some of the zone SMP commands.
I see, thanks.
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 14:18 ` James Bottomley
2009-05-11 15:03 ` FUJITA Tomonori
@ 2009-05-12 0:19 ` Tejun Heo
2009-05-12 3:43 ` James Bottomley
1 sibling, 1 reply; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 0:19 UTC (permalink / raw)
To: James Bottomley
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
Hello, all.
James Bottomley wrote:
>>> Does resid_len make any sense w/ failed requests? I think we would be
>>> better off with declaring residual count to be undefined on request
>>> failure. Is there any place which depends on it?
>> IIRC, I wrote the code. I think that this doesn't matter but it's
>> better not to change the behavior unless Eric ack on this change
>> (maybe LSI has some management binary that assume this behavior though
>> it's unlikely).
>
> Actually, yes it does, for many possible reasons.
>
> The first being if the device is too stupid to report an actual sector
> location the next best way of determining where the error occurred is
> from the residual. We don't make use of this in kernel (perhaps we
> should?) but some of the user space programs for CD/DVD burning do.
Really? Residual count on command success is used but on failure?
That's a dangerous territory. When a SG_IO fails, the only data the
app should be accessing is the sense data if the status indicates its
validity. The problems with residual count on failed command are...
* Not well defined. What does it mean really? It can't indicate
successful partial transfer. If the request partially succeeded,
the required behavior is to successfully complete the request
partially with residual count and then fail the latter part when
issued again. If the failure applies to the whole request but
location information is useful, it should be carried in the sense
data.
* What about corner values? What does 0 or full resid count on
failure mean?
* Different layers of failing. In SG_IO interface, a request may fail
with -EIO way before it reaches block layer. Residual count can't
be set to any meaningful value in these cases. We can set it to
full count for these fast fail paths, but do we really wanna go
there? Another problem is when a driver is missing SG_IO
capability. Who's responsible for setting resid count in that case?
How is upper layer gonna determine a SG_IO failed because lower
level driver didn't support it or it genuinely failed?
I think it's just silly to give any meaning to resid count when the
request fails. It's best to leave the field unmodified or just
declare it undefined.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 11:31 ` Boaz Harrosh
2009-05-11 14:59 ` FUJITA Tomonori
@ 2009-05-12 0:27 ` Tejun Heo
2009-05-12 8:46 ` Boaz Harrosh
1 sibling, 1 reply; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 0:27 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
Hello, Boaz.
Boaz Harrosh wrote:
> On 05/11/2009 02:48 AM, Tejun Heo wrote:
>> Does resid_len make any sense w/ failed requests? I think we would be
>> better off with declaring residual count to be undefined on request
>> failure. Is there any place which depends on it?
>>
>> That said, the value is eventually exported to userland, so it might
>> be better to not change it. Eh... I don't know.
>
> When possible, residual should be exact because the residual amount
> is not bounced and might even be zeroed-out for security, as the
> meaning of residual is that these bytes are garbage.
When a request failed, the whole buffer is garbage. There's no
partial transfer. There shouldn't be. I don't think residual count
on request failure means anything. Also, the 'whenever possible'
doesn't mean much when the issuer can't determine whether the value is
valid or not. On success, we should guarantee resid count is valid,
on failure, I don't see a way we can.
>>>> index 3da02e4..6605ec9 100644
>>>> --- a/drivers/scsi/libsas/sas_expander.c
>>>> +++ b/drivers/scsi/libsas/sas_expander.c
>>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>>>> bio_data(rsp->bio), rsp->data_len);
>>>> if (ret > 0) {
>>>> /* positive number is the untransferred residual */
>>>> - rsp->data_len = ret;
>>>> - req->data_len = 0;
>>>> + rsp->resid_len = ret;
>>>> ret = 0;
>>>> - } else if (ret == 0) {
>>>> - rsp->data_len = 0;
>>>> - req->data_len = 0;
>>>> }
>>>>
>>>> return ret;
>>> This is actually a bug fix, as well as a strait conversion
>> Can you elaborate a bit about the bug fix part?
>
> Nothing big really, just that before (according to the comment), the
> theoretical negative case would be full-residual. and now it is zero
> (untouched).
Yeah, the same thing as above, I suppose.
> I know that in iscsi a negative residual is possible which means
> over-flow. That is: the target had more data to give then the buffer
> had space for. (which is not an error at all)
Hmm... I've never seen negative residual in use. Is it even defined?
>>> The above is just a case of:
>>>
>>> - int leftover = (req->hard_nr_sectors << 9);
>>> -
>>> - if (blk_pc_request(req))
>>> - leftover = req->data_len;
>>> + int leftover = blk_rq_bytes();
>>>
>>> Which you separated into to stages, much later right?
>> Aieee.. yeah, that's one stupid misconversion. That function should
>> just use blk_end_request_all(). Will fix. Thanks for spotting it.
>
> Yes, there is a couple of other places that have that with the
> meaning of blk_end_request_all() (Have I commented on one?). Are you
> doing this conversion in these patchset? or this is for a second
> pass?
If you spot some, please go ahead and submit patches. I don't have
any patch in my queue which hasn't been posted.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2
2009-05-11 12:06 ` Boaz Harrosh
@ 2009-05-12 0:49 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 0:49 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel
Hello, Boaz.
Boaz Harrosh wrote:
> I've inspected all scsi touching patches and refrained from comments
> on the simple rename bunch. They all look very good accept that one
> place. (which will effect 2 patches)
>
> There are few more places that can use blk_end_request_all() after
> these changes.
>
> (The same internet outage on this reply)
The tree is now in Jens' tree, so it won't be rebased from this point
on. Please go ahead and submit patches.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 0:19 ` Tejun Heo
@ 2009-05-12 3:43 ` James Bottomley
2009-05-12 6:04 ` Tejun Heo
0 siblings, 1 reply; 73+ messages in thread
From: James Bottomley @ 2009-05-12 3:43 UTC (permalink / raw)
To: Tejun Heo
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Tue, 2009-05-12 at 09:19 +0900, Tejun Heo wrote:
> Hello, all.
>
> James Bottomley wrote:
> >>> Does resid_len make any sense w/ failed requests? I think we would be
> >>> better off with declaring residual count to be undefined on request
> >>> failure. Is there any place which depends on it?
> >> IIRC, I wrote the code. I think that this doesn't matter but it's
> >> better not to change the behavior unless Eric ack on this change
> >> (maybe LSI has some management binary that assume this behavior though
> >> it's unlikely).
> >
> > Actually, yes it does, for many possible reasons.
> >
> > The first being if the device is too stupid to report an actual sector
> > location the next best way of determining where the error occurred is
> > from the residual. We don't make use of this in kernel (perhaps we
> > should?) but some of the user space programs for CD/DVD burning do.
>
> Really? Residual count on command success is used but on failure?
> That's a dangerous territory. When a SG_IO fails, the only data the
> app should be accessing is the sense data if the status indicates its
> validity. The problems with residual count on failed command are...
>
> * Not well defined. What does it mean really? It can't indicate
> successful partial transfer. If the request partially succeeded,
> the required behavior is to successfully complete the request
> partially with residual count and then fail the latter part when
> issued again. If the failure applies to the whole request but
> location information is useful, it should be carried in the sense
> data.
The definition is the amount of data transfer requested less the actual
that went over the wire ... that's certainly a well defined quantity;
although, one could argue about what this means in the device.
Certainly I agree that just because the data was transferred to or from
the device is no guarantee that the device did anything with it (or
transferred it accurately).
> * What about corner values? What does 0 or full resid count on
> failure mean?
0 means everything transferred, full residual means nothing did.
> * Different layers of failing. In SG_IO interface, a request may fail
> with -EIO way before it reaches block layer. Residual count can't
> be set to any meaningful value in these cases. We can set it to
> full count for these fast fail paths, but do we really wanna go
> there? Another problem is when a driver is missing SG_IO
> capability. Who's responsible for setting resid count in that case?
> How is upper layer gonna determine a SG_IO failed because lower
> level driver didn't support it or it genuinely failed?
Well, I prefer the concept of transfer length, which would be
initialised to zero ... however, residuals should be initialised to the
actual transfer count.
> I think it's just silly to give any meaning to resid count when the
> request fails. It's best to leave the field unmodified or just
> declare it undefined.
It's current behaviour. Technically that makes it part of the SG_IO
ABI ... although it could be deprecated if someone can verify there are
no current users.
James
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 3:43 ` James Bottomley
@ 2009-05-12 6:04 ` Tejun Heo
2009-05-12 14:08 ` James Bottomley
0 siblings, 1 reply; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 6:04 UTC (permalink / raw)
To: James Bottomley
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
Hello, James.
James Bottomley wrote:
>> * Not well defined. What does it mean really? It can't indicate
>> successful partial transfer. If the request partially succeeded,
>> the required behavior is to successfully complete the request
>> partially with residual count and then fail the latter part when
>> issued again. If the failure applies to the whole request but
>> location information is useful, it should be carried in the sense
>> data.
>
> The definition is the amount of data transfer requested less the actual
> that went over the wire ... that's certainly a well defined quantity;
> although, one could argue about what this means in the device.
> Certainly I agree that just because the data was transferred to or from
> the device is no guarantee that the device did anything with it (or
> transferred it accurately).
I think it's more like how many bytes are valid where the validity is
defined as the number of meaningful bytes on dev -> host commands and
the number of bytes the device actually consumed on the other
direction. Please note that this is different from the number of
bytes transferred due to padding or under other error conditions.
>> * What about corner values? What does 0 or full resid count on
>> failure mean?
>
> 0 means everything transferred, full residual means nothing did.
Yeap, I was wondering about the combination 0 resid count + failure.
What would it mean? All bytes are valid but the command failed?
>> * Different layers of failing. In SG_IO interface, a request may fail
>> with -EIO way before it reaches block layer. Residual count can't
>> be set to any meaningful value in these cases. We can set it to
>> full count for these fast fail paths, but do we really wanna go
>> there? Another problem is when a driver is missing SG_IO
>> capability. Who's responsible for setting resid count in that case?
>> How is upper layer gonna determine a SG_IO failed because lower
>> level driver didn't support it or it genuinely failed?
>
> Well, I prefer the concept of transfer length, which would be
> initialised to zero ... however, residuals should be initialised to
> the actual transfer count.
>
>> I think it's just silly to give any meaning to resid count when the
>> request fails. It's best to leave the field unmodified or just
>> declare it undefined.
>
> It's current behaviour. Technically that makes it part of the SG_IO
> ABI ... although it could be deprecated if someone can verify there are
> no current users.
The behavior wasn't guaranteed before the change in paths including
SG_IO fast fail one. libata and ide have been and are completely
funky about residual counts anyway so I highly doubt anyone has been
depending on it.
There's nothing wrong with keeping the original behavior in itself but
to me it looks like it would be a bad precedence when no one should
depend on the behavior.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 0:27 ` Tejun Heo
@ 2009-05-12 8:46 ` Boaz Harrosh
2009-05-12 9:07 ` Tejun Heo
0 siblings, 1 reply; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-12 8:46 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
On 05/12/2009 03:27 AM, Tejun Heo wrote:
> Hello, Boaz.
>
> Boaz Harrosh wrote:
>> On 05/11/2009 02:48 AM, Tejun Heo wrote:
>>> Does resid_len make any sense w/ failed requests? I think we would be
>>> better off with declaring residual count to be undefined on request
>>> failure. Is there any place which depends on it?
>>>
>>> That said, the value is eventually exported to userland, so it might
>>> be better to not change it. Eh... I don't know.
>> When possible, residual should be exact because the residual amount
>> is not bounced and might even be zeroed-out for security, as the
>> meaning of residual is that these bytes are garbage.
>
> When a request failed, the whole buffer is garbage.
ret is the transferred size, right? I don't see any check for
success/failure in below code.
> There's no
> partial transfer. There shouldn't be. I don't think residual count
> on request failure means anything.
That's not true, there are many cases when transfer failed eventually
but some bytes are valid. Even the simple read/write case. Imagine a
very large transfer with last sector encounter a "bad sector". that can
be critical, (trying to rescue a disk). And many other examples.
Also, the 'whenever possible'
> doesn't mean much when the issuer can't determine whether the value is
> valid or not. On success, we should guarantee resid count is valid,
> on failure, I don't see a way we can.
>
Code is as strong as it's weakest link, right? If lower driver/firmware
is brain-dead, what can we do? But why give up where you can do better?
The scsi standard is very clear about what every one should do with the residual
and what it means at every stage, everyone should do his part. Here at the middle
layer we need to correctly translate what lower level returned and pass it up the
chain.
Must stacks are amateuristic in regard to error handling but some are not, what
should we strive for, if we can?
>>>>> index 3da02e4..6605ec9 100644
>>>>> --- a/drivers/scsi/libsas/sas_expander.c
>>>>> +++ b/drivers/scsi/libsas/sas_expander.c
>>>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>>>>> bio_data(rsp->bio), rsp->data_len);
>>>>> if (ret > 0) {
>>>>> /* positive number is the untransferred residual */
>>>>> - rsp->data_len = ret;
>>>>> - req->data_len = 0;
>>>>> + rsp->resid_len = ret;
>>>>> ret = 0;
>>>>> - } else if (ret == 0) {
>>>>> - rsp->data_len = 0;
>>>>> - req->data_len = 0;
>>>>> }
>>>>>
>>>>> return ret;
>>>> This is actually a bug fix, as well as a strait conversion
>>> Can you elaborate a bit about the bug fix part?
>> Nothing big really, just that before (according to the comment), the
>> theoretical negative case would be full-residual. and now it is zero
>> (untouched).
>
> Yeah, the same thing as above, I suppose.
>
Should we check for errors then?
>> I know that in iscsi a negative residual is possible which means
>> over-flow. That is: the target had more data to give then the buffer
>> had space for. (which is not an error at all)
>
> Hmm... I've never seen negative residual in use. Is it even defined?
>
It is defined, as I explained before. But yes no one uses it in Kernel.
The "good" low-level drivers fix it up by setting resid to zero, in that
case. (other wise the upper layers might crash)
>>>> The above is just a case of:
>>>>
>>>> - int leftover = (req->hard_nr_sectors << 9);
>>>> -
>>>> - if (blk_pc_request(req))
>>>> - leftover = req->data_len;
>>>> + int leftover = blk_rq_bytes();
>>>>
>>>> Which you separated into to stages, much later right?
>>> Aieee.. yeah, that's one stupid misconversion. That function should
>>> just use blk_end_request_all(). Will fix. Thanks for spotting it.
>> Yes, there is a couple of other places that have that with the
>> meaning of blk_end_request_all() (Have I commented on one?). Are you
>> doing this conversion in these patchset? or this is for a second
>> pass?
>
> If you spot some, please go ahead and submit patches. I don't have
> any patch in my queue which hasn't been posted.
>
> Thanks.
>
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-11 14:59 ` FUJITA Tomonori
@ 2009-05-12 8:58 ` Boaz Harrosh
2009-05-12 15:00 ` FUJITA Tomonori
0 siblings, 1 reply; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-12 8:58 UTC (permalink / raw)
To: FUJITA Tomonori
Cc: tj, axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On 05/11/2009 05:59 PM, FUJITA Tomonori wrote:
> On Mon, 11 May 2009 14:31:41 +0300
> Boaz Harrosh <bharrosh@panasas.com> wrote:
>
>>>>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
>>>>> index 3da02e4..6605ec9 100644
>>>>> --- a/drivers/scsi/libsas/sas_expander.c
>>>>> +++ b/drivers/scsi/libsas/sas_expander.c
>>>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>>>>> bio_data(rsp->bio), rsp->data_len);
>>>>> if (ret > 0) {
>>>>> /* positive number is the untransferred residual */
>>>>> - rsp->data_len = ret;
>>>>> - req->data_len = 0;
>>>>> + rsp->resid_len = ret;
>>>>> ret = 0;
>>>>> - } else if (ret == 0) {
>>>>> - rsp->data_len = 0;
>>>>> - req->data_len = 0;
>>>>> }
>>>>>
>>>>> return ret;
>>>> This is actually a bug fix, as well as a strait conversion
>>> Can you elaborate a bit about the bug fix part?
>>>
>> Nothing big really, just that before (according to the comment), the theoretical
>> negative case would be full-residual. and now it is zero (untouched).
>>
>> I know that in iscsi a negative residual is possible which means over-flow. That is:
>> the target had more data to give then the buffer had space for. (which is not an error at all)
>
> Hmm, iSCSI? This code is for SAS management Protocol.
>
I gave that as an example of what the scsi standard says about negative
residual count return from the target. If SAS as sepecific and different
meaning to negative residual, it should be noted and handled.
> smp_execute_task returns a negative value for some errors (ENOMEM, the
> hardware doesn't respond, etc). It's not related with 'transferred
> buffer length' at all.
This is a serious problem, and a violation of the block/scsi stacks. If so, then
in that case error/status should be set properly. And residual cleared.
Failing to return an error might theoretically be catastrophic. If what
you say is certain then previous behaviour is better then after this patch.
I'm not at all familiar with this code. Could you send a patch to
fix these things?
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 8:46 ` Boaz Harrosh
@ 2009-05-12 9:07 ` Tejun Heo
2009-05-12 9:10 ` Tejun Heo
2009-05-12 9:52 ` Boaz Harrosh
0 siblings, 2 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 9:07 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
Hello, Boaz.
Boaz Harrosh wrote:
>> When a request failed, the whole buffer is garbage.
>
> ret is the transferred size, right? I don't see any check for
> success/failure in below code.
>
>> There's no
>> partial transfer. There shouldn't be. I don't think residual count
>> on request failure means anything.
>
> That's not true, there are many cases when transfer failed eventually
> but some bytes are valid. Even the simple read/write case. Imagine a
> very large transfer with last sector encounter a "bad sector". that can
> be critical, (trying to rescue a disk). And many other examples.
No, it doesn't work like that. As I wrote before, those partial
transfers are returned to the issuer as partial _SUCCESS_ not partial
failure. ie. it's successful request w/ positive residual count not
the other way around. The error is communicated to the issuer when
the leftover is re-issued. There's no such thing as partial failure.
Please consider write failing after successfully writing certain
number of bytes. A failed write command MUST NOT cause any actual
write on the device.
Residual count is not about how many bytes have been transferred. The
number of transferred bytes itself doesn't mean a thing because it
changes depending on which transfer protocol is used regardless of
where the actual failure is. Residual count is about how many bytes
have been actually produced or consumed and when a command fails none
should have been.
>> Also, the 'whenever possible'
>> doesn't mean much when the issuer can't determine whether the value is
>> valid or not. On success, we should guarantee resid count is valid,
>> on failure, I don't see a way we can.
>>
>
> Code is as strong as it's weakest link, right? If lower
> driver/firmware is brain-dead, what can we do? But why give up where
> you can do better?
>
> The scsi standard is very clear about what every one should do with
> the residual and what it means at every stage, everyone should do
> his part. Here at the middle layer we need to correctly translate
> what lower level returned and pass it up the chain.
>
> Must stacks are amateuristic in regard to error handling but some
> are not, what
>
> should we strive for, if we can?
No it's not about being good or bad. It's about being plain
undefined. There is no value in setting an inherently undefined value
to certain values in certain corner cases.
>>> I know that in iscsi a negative residual is possible which means
>>> over-flow. That is: the target had more data to give then the buffer
>>> had space for. (which is not an error at all)
>> Hmm... I've never seen negative residual in use. Is it even defined?
>
> It is defined, as I explained before. But yes no one uses it in Kernel.
> The "good" low-level drivers fix it up by setting resid to zero, in that
> case. (other wise the upper layers might crash)
If the upper layer might crash if the value is negative, I think it's
quite understandable to call negative values to be undefined. Or
should we call it unsupported?
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 9:07 ` Tejun Heo
@ 2009-05-12 9:10 ` Tejun Heo
2009-05-12 9:52 ` Boaz Harrosh
1 sibling, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 9:10 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
Tejun Heo wrote:
...
> Please consider write failing after successfully writing certain
> number of bytes. A failed write command MUST NOT cause any actual
> write on the device.
>
> Residual count is not about how many bytes have been transferred. The
> number of transferred bytes itself doesn't mean a thing because it
> changes depending on which transfer protocol is used regardless of
> where the actual failure is. Residual count is about how many bytes
> have been actually produced or consumed and when a command fails none
> should have been.
Please note that in the above 'command' and 'residual count' are not
as defined in SCSI. Those terms refer to how those concepts are used
in the kernel and via SG_IO interface.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 9:07 ` Tejun Heo
2009-05-12 9:10 ` Tejun Heo
@ 2009-05-12 9:52 ` Boaz Harrosh
2009-05-12 10:06 ` Tejun Heo
1 sibling, 1 reply; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-12 9:52 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
On 05/12/2009 12:07 PM, Tejun Heo wrote:
> Hello, Boaz.
>
> Boaz Harrosh wrote:
>>> When a request failed, the whole buffer is garbage.
>> ret is the transferred size, right? I don't see any check for
>> success/failure in below code.
>>
>>> There's no
>>> partial transfer. There shouldn't be. I don't think residual count
>>> on request failure means anything.
>> That's not true, there are many cases when transfer failed eventually
>> but some bytes are valid. Even the simple read/write case. Imagine a
>> very large transfer with last sector encounter a "bad sector". that can
>> be critical, (trying to rescue a disk). And many other examples.
>
> No, it doesn't work like that. As I wrote before, those partial
> transfers are returned to the issuer as partial _SUCCESS_ not partial
> failure. ie. it's successful request w/ positive residual count not
> the other way around. The error is communicated to the issuer when
> the leftover is re-issued. There's no such thing as partial failure.
>
> Please consider write failing after successfully writing certain
> number of bytes. A failed write command MUST NOT cause any actual
> write on the device.
>
I know for sure that scsi has other cases. The above is a per-command
per-sense-information. Some commands might write/read some bytes and still return
CHECK-CONDITION with some sense-info+residual pertaining what was actually
executed.
> Residual count is not about how many bytes have been transferred. The
> number of transferred bytes itself doesn't mean a thing because it
> changes depending on which transfer protocol is used regardless of
> where the actual failure is. Residual count is about how many bytes
> have been actually produced or consumed and when a command fails none
> should have been.
>
See above. I know for a fact that this is not always the case, and that
it is a per command. In fact I relay on such behaviour in the osd filesystems.
If the midlayer would filter such cases for me I would have had data
corruptions.
[Read passed end of osd-object will read up to end, and return a warning
check condition. With a choice of returning zero-bytes at invalid bytes
or returning residual]
> Please note that in the above 'command' and 'residual count' are not
> as defined in SCSI. Those terms refer to how those concepts are used
> in the kernel and via SG_IO interface.
>
I do have Kernel code that relays on this. I do use bsg's SG_IO successfully
that has above behaviour.
That is: total transparency of residual count and sense information
communicated between user-code and target. Then user-code can make intelligent
decisions based on what he's done. And this is what the Kernel policy
should be. No more, no less.
>>> Also, the 'whenever possible'
>>> doesn't mean much when the issuer can't determine whether the value is
>>> valid or not. On success, we should guarantee resid count is valid,
>>> on failure, I don't see a way we can.
>>>
>> Code is as strong as it's weakest link, right? If lower
>> driver/firmware is brain-dead, what can we do? But why give up where
>> you can do better?
>>
>> The scsi standard is very clear about what every one should do with
>> the residual and what it means at every stage, everyone should do
>> his part. Here at the middle layer we need to correctly translate
>> what lower level returned and pass it up the chain.
>>
>> Must stacks are amateuristic in regard to error handling but some
>> are not, what
>>
>> should we strive for, if we can?
>
> No it's not about being good or bad. It's about being plain
> undefined. There is no value in setting an inherently undefined value
> to certain values in certain corner cases.
>
Again. With some commands/subsystems these are undefined, with some
like SCSI, they are very well defined in all cases. (Even in the undefined
cases). So please keep them intact, some code might want to relay on this.
(On the undefined cases Kernel should set a policy on what is returned)
>>>> I know that in iscsi a negative residual is possible which means
>>>> over-flow. That is: the target had more data to give then the buffer
>>>> had space for. (which is not an error at all)
>>> Hmm... I've never seen negative residual in use. Is it even defined?
>> It is defined, as I explained before. But yes no one uses it in Kernel.
>> The "good" low-level drivers fix it up by setting resid to zero, in that
>> case. (other wise the upper layers might crash)
>
> If the upper layer might crash if the value is negative, I think it's
> quite understandable to call negative values to be undefined. Or
> should we call it unsupported?
>
Yes, unsupported.
Since current meaning means success, actually, and there is no real extra information
that users need.
Look at it this way, until today negative meant Zero with extra information which
no one cares for.
> Thanks.
>
Cheers
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 9:52 ` Boaz Harrosh
@ 2009-05-12 10:06 ` Tejun Heo
2009-05-12 11:08 ` Boaz Harrosh
0 siblings, 1 reply; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 10:06 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
Hello, Boaz.
Boaz Harrosh wrote:
>> Please consider write failing after successfully writing certain
>> number of bytes. A failed write command MUST NOT cause any actual
>> write on the device.
>>
>
> I know for sure that scsi has other cases. The above is a
> per-command per-sense-information. Some commands might write/read
> some bytes and still return CHECK-CONDITION with some
> sense-info+residual pertaining what was actually executed.
I see, so we're talking about two different layers here. At least at
the block layer, there's nothing like partial failure. I highly doubt
it would work with buffer bouncing and etc. A failed request is a
failed request. It may have sense request but doesn't have any
meaningful actual data.
>> Residual count is not about how many bytes have been transferred. The
>> number of transferred bytes itself doesn't mean a thing because it
>> changes depending on which transfer protocol is used regardless of
>> where the actual failure is. Residual count is about how many bytes
>> have been actually produced or consumed and when a command fails none
>> should have been.
>>
> See above. I know for a fact that this is not always the case, and
> that it is a per command. In fact I relay on such behaviour in the
> osd filesystems. If the midlayer would filter such cases for me I
> would have had data corruptions.
>
> [Read passed end of osd-object will read up to end, and return a
> warning check condition. With a choice of returning zero-bytes at
> invalid bytes or returning residual]
Umm... If it's going through block layer, it should be split in such a
way that the initial partial part is completed successuflly and then
the latter part fails when re-issued. Not sure whether that would be
possible for your code tho.
>> Please note that in the above 'command' and 'residual count' are not
>> as defined in SCSI. Those terms refer to how those concepts are used
>> in the kernel and via SG_IO interface.
>
> I do have Kernel code that relays on this. I do use bsg's SG_IO
> successfully that has above behaviour.
>
> That is: total transparency of residual count and sense information
> communicated between user-code and target. Then user-code can make
> intelligent decisions based on what he's done. And this is what the
> Kernel policy should be. No more, no less.
I'm not sure the said code is safe with regard to buffer bouncing and
all.
...
>> No it's not about being good or bad. It's about being plain
>> undefined. There is no value in setting an inherently undefined value
>> to certain values in certain corner cases.
>>
>
> Again. With some commands/subsystems these are undefined, with some
> like SCSI, they are very well defined in all cases. (Even in the
> undefined cases). So please keep them intact, some code might want
> to relay on this.
>
> (On the undefined cases Kernel should set a policy on what is
> returned)
IIUC, it's undefined at the block layer, well, at least till now and
it working for your code could just be dumb luck (bouncing not
happened or data transfer direction is to device or whatever).
So, basically, your code which depends on residual count on failure is
broken. :-(
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 10:06 ` Tejun Heo
@ 2009-05-12 11:08 ` Boaz Harrosh
2009-05-12 15:20 ` Tejun Heo
0 siblings, 1 reply; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-12 11:08 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
On 05/12/2009 01:06 PM, Tejun Heo wrote:
> Hello, Boaz.
>
> Boaz Harrosh wrote:
>>> Please consider write failing after successfully writing certain
>>> number of bytes. A failed write command MUST NOT cause any actual
>>> write on the device.
>>>
>> I know for sure that scsi has other cases. The above is a
>> per-command per-sense-information. Some commands might write/read
>> some bytes and still return CHECK-CONDITION with some
>> sense-info+residual pertaining what was actually executed.
>
> I see, so we're talking about two different layers here. At least at
> the block layer, there's nothing like partial failure. I highly doubt
> it would work with buffer bouncing and etc. A failed request is a
> failed request. It may have sense request but doesn't have any
> meaningful actual data.
>
You are right, on reads I might be screwed.
>>> Residual count is not about how many bytes have been transferred. The
>>> number of transferred bytes itself doesn't mean a thing because it
>>> changes depending on which transfer protocol is used regardless of
>>> where the actual failure is. Residual count is about how many bytes
>>> have been actually produced or consumed and when a command fails none
>>> should have been.
>>>
>> See above. I know for a fact that this is not always the case, and
>> that it is a per command. In fact I relay on such behaviour in the
>> osd filesystems. If the midlayer would filter such cases for me I
>> would have had data corruptions.
>>
>> [Read passed end of osd-object will read up to end, and return a
>> warning check condition. With a choice of returning zero-bytes at
>> invalid bytes or returning residual]
>
> Umm... If it's going through block layer, it should be split in such a
> way that the initial partial part is completed successuflly and then
> the latter part fails when re-issued. Not sure whether that would be
> possible for your code tho.
>
>>> Please note that in the above 'command' and 'residual count' are not
>>> as defined in SCSI. Those terms refer to how those concepts are used
>>> in the kernel and via SG_IO interface.
>> I do have Kernel code that relays on this. I do use bsg's SG_IO
>> successfully that has above behaviour.
>>
>> That is: total transparency of residual count and sense information
>> communicated between user-code and target. Then user-code can make
>> intelligent decisions based on what he's done. And this is what the
>> Kernel policy should be. No more, no less.
>
> I'm not sure the said code is safe with regard to buffer bouncing and
> all.
>
> ...
>>> No it's not about being good or bad. It's about being plain
>>> undefined. There is no value in setting an inherently undefined value
>>> to certain values in certain corner cases.
>>>
>> Again. With some commands/subsystems these are undefined, with some
>> like SCSI, they are very well defined in all cases. (Even in the
>> undefined cases). So please keep them intact, some code might want
>> to relay on this.
>>
>> (On the undefined cases Kernel should set a policy on what is
>> returned)
>
> IIUC, it's undefined at the block layer, well, at least till now and
> it working for your code could just be dumb luck (bouncing not
> happened or data transfer direction is to device or whatever).
>
> So, basically, your code which depends on residual count on failure is
> broken. :-(
>
Yes, you are unfortunately, totally right. As I sent the last patches
(blk_make_request) I realized that current osd code has a bug in that
it does not bounce properly, all of the buffers. Since there is only
iscsi transports, which are byte-aligned, and the network does it's
own highmem bouncing, in practice there is no such bug.
But you are right, not thanks to block policy.
> Thanks.
>
The solution to this, I think, is that the bouncing layer should receive a
residual count, and not bounce anything beyond what's transferred. (On reads,
writes does nothing), and zero-out the rest. This of course means that all
block drivers make sure residual is properly set, the way it should as explained
in this thread. (SCSI does the right thing where it can, for example
see scsi_execute())
Thanks for bringing this up. Another unfortunate item on my todo list.
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 6:04 ` Tejun Heo
@ 2009-05-12 14:08 ` James Bottomley
2009-05-12 14:34 ` Alan Stern
2009-05-12 15:17 ` Tejun Heo
0 siblings, 2 replies; 73+ messages in thread
From: James Bottomley @ 2009-05-12 14:08 UTC (permalink / raw)
To: Tejun Heo
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Tue, 2009-05-12 at 15:04 +0900, Tejun Heo wrote:
> Hello, James.
>
> James Bottomley wrote:
> >> * Not well defined. What does it mean really? It can't indicate
> >> successful partial transfer. If the request partially succeeded,
> >> the required behavior is to successfully complete the request
> >> partially with residual count and then fail the latter part when
> >> issued again. If the failure applies to the whole request but
> >> location information is useful, it should be carried in the sense
> >> data.
> >
> > The definition is the amount of data transfer requested less the actual
> > that went over the wire ... that's certainly a well defined quantity;
> > although, one could argue about what this means in the device.
> > Certainly I agree that just because the data was transferred to or from
> > the device is no guarantee that the device did anything with it (or
> > transferred it accurately).
>
> I think it's more like how many bytes are valid where the validity is
> defined as the number of meaningful bytes on dev -> host commands and
> the number of bytes the device actually consumed on the other
> direction. Please note that this is different from the number of
> bytes transferred due to padding or under other error conditions.
For failed commands we don't have that information. All we know is how
many bytes were actually transferred (because the HBA keeps a count), so
it's the actual transfer count we use to construct the residual. No
imputation of validity or otherwise. It just says I transferred this
amount, based on the error make of it what you will.
> >> * What about corner values? What does 0 or full resid count on
> >> failure mean?
> >
> > 0 means everything transferred, full residual means nothing did.
>
> Yeap, I was wondering about the combination 0 resid count + failure.
> What would it mean? All bytes are valid but the command failed?
Well, there are certain SCSI conditions called deferred errors and the
like where we return Check Condition but everything's OK, redisual count
should be zero, same goes for recovered errors ... there are actually
lots of things we can get back as an "error" which means I'm warning you
of something, but the transfer was OK. Likewise we get unit attentions
(essentialy AENs) which mean I'm telling you something before you start,
so please try again. Here residual would be the full transfer. Also,
we have the nasty USB case where no error return but an actual residual
tells you something really went wrong.
> >> * Different layers of failing. In SG_IO interface, a request may fail
> >> with -EIO way before it reaches block layer. Residual count can't
> >> be set to any meaningful value in these cases. We can set it to
> >> full count for these fast fail paths, but do we really wanna go
> >> there? Another problem is when a driver is missing SG_IO
> >> capability. Who's responsible for setting resid count in that case?
> >> How is upper layer gonna determine a SG_IO failed because lower
> >> level driver didn't support it or it genuinely failed?
> >
> > Well, I prefer the concept of transfer length, which would be
> > initialised to zero ... however, residuals should be initialised to
> > the actual transfer count.
> >
> >> I think it's just silly to give any meaning to resid count when the
> >> request fails. It's best to leave the field unmodified or just
> >> declare it undefined.
> >
> > It's current behaviour. Technically that makes it part of the SG_IO
> > ABI ... although it could be deprecated if someone can verify there are
> > no current users.
>
> The behavior wasn't guaranteed before the change in paths including
> SG_IO fast fail one. libata and ide have been and are completely
> funky about residual counts anyway so I highly doubt anyone has been
> depending on it.
>
> There's nothing wrong with keeping the original behavior in itself but
> to me it looks like it would be a bad precedence when no one should
> depend on the behavior.
OK, that's what we'll do then, thanks.
James
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 14:08 ` James Bottomley
@ 2009-05-12 14:34 ` Alan Stern
2009-05-12 15:17 ` Tejun Heo
1 sibling, 0 replies; 73+ messages in thread
From: Alan Stern @ 2009-05-12 14:34 UTC (permalink / raw)
To: James Bottomley
Cc: Tejun Heo, FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff,
linux-ide, linux-scsi, bzolnier, petkovbb, sshtylyov,
mike.miller, Eric.Moore, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Tue, 12 May 2009, James Bottomley wrote:
> On Tue, 2009-05-12 at 15:04 +0900, Tejun Heo wrote:
> > Hello, James.
> >
> > James Bottomley wrote:
> > >> * Not well defined. What does it mean really? It can't indicate
> > >> successful partial transfer. If the request partially succeeded,
> > >> the required behavior is to successfully complete the request
> > >> partially with residual count and then fail the latter part when
> > >> issued again. If the failure applies to the whole request but
> > >> location information is useful, it should be carried in the sense
> > >> data.
> > >
> > > The definition is the amount of data transfer requested less the actual
> > > that went over the wire ... that's certainly a well defined quantity;
> > > although, one could argue about what this means in the device.
> > > Certainly I agree that just because the data was transferred to or from
> > > the device is no guarantee that the device did anything with it (or
> > > transferred it accurately).
> >
> > I think it's more like how many bytes are valid where the validity is
> > defined as the number of meaningful bytes on dev -> host commands and
> > the number of bytes the device actually consumed on the other
> > direction. Please note that this is different from the number of
> > bytes transferred due to padding or under other error conditions.
>
> For failed commands we don't have that information. All we know is how
> many bytes were actually transferred (because the HBA keeps a count), so
> it's the actual transfer count we use to construct the residual. No
> imputation of validity or otherwise. It just says I transferred this
> amount, based on the error make of it what you will.
It might help to agree on terminology. For example, in the USB
mass-storage protocol, "Error" means the command or its result could
not be transferred at all -- a problem at the link layer. "Failure"
means the command was received and possibly executed to some extent,
but the device returned Check Condition status. "Success" means the
same as failure except that the device returned Okay status rather than
Check Condition.
So for an error, the residue is meaningless (although you could say
that it was equal to the full transfer length if you want). For a
failure or a success it is meaningful, and it need not be the same as
the amount of data transferred.
Incidentally, as long as we're trying to be precise about terminology,
the correct term is "residue", not "residual". In fact, the last time
I checked a copy of the SCSI spec the word "residual" did not occur
anywhere in it.
> > >> * What about corner values? What does 0 or full resid count on
> > >> failure mean?
> > >
> > > 0 means everything transferred, full residual means nothing did.
> >
> > Yeap, I was wondering about the combination 0 resid count + failure.
> > What would it mean? All bytes are valid but the command failed?
>
> Well, there are certain SCSI conditions called deferred errors and the
> like where we return Check Condition but everything's OK, redisual count
> should be zero, same goes for recovered errors ... there are actually
> lots of things we can get back as an "error" which means I'm warning you
> of something, but the transfer was OK. Likewise we get unit attentions
> (essentialy AENs) which mean I'm telling you something before you start,
> so please try again. Here residual would be the full transfer. Also,
> we have the nasty USB case where no error return but an actual residual
> tells you something really went wrong.
These should all be described either as failures or as successes with
a partial transfer, not as errors.
Alan Stern
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
@ 2009-05-12 14:34 ` Alan Stern
0 siblings, 0 replies; 73+ messages in thread
From: Alan Stern @ 2009-05-12 14:34 UTC (permalink / raw)
To: James Bottomley
Cc: Tejun Heo, FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff,
linux-ide, linux-scsi, bzolnier, petkovbb, sshtylyov,
mike.miller, Eric.Moore, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Tue, 12 May 2009, James Bottomley wrote:
> On Tue, 2009-05-12 at 15:04 +0900, Tejun Heo wrote:
> > Hello, James.
> >
> > James Bottomley wrote:
> > >> * Not well defined. What does it mean really? It can't indicate
> > >> successful partial transfer. If the request partially succeeded,
> > >> the required behavior is to successfully complete the request
> > >> partially with residual count and then fail the latter part when
> > >> issued again. If the failure applies to the whole request but
> > >> location information is useful, it should be carried in the sense
> > >> data.
> > >
> > > The definition is the amount of data transfer requested less the actual
> > > that went over the wire ... that's certainly a well defined quantity;
> > > although, one could argue about what this means in the device.
> > > Certainly I agree that just because the data was transferred to or from
> > > the device is no guarantee that the device did anything with it (or
> > > transferred it accurately).
> >
> > I think it's more like how many bytes are valid where the validity is
> > defined as the number of meaningful bytes on dev -> host commands and
> > the number of bytes the device actually consumed on the other
> > direction. Please note that this is different from the number of
> > bytes transferred due to padding or under other error conditions.
>
> For failed commands we don't have that information. All we know is how
> many bytes were actually transferred (because the HBA keeps a count), so
> it's the actual transfer count we use to construct the residual. No
> imputation of validity or otherwise. It just says I transferred this
> amount, based on the error make of it what you will.
It might help to agree on terminology. For example, in the USB
mass-storage protocol, "Error" means the command or its result could
not be transferred at all -- a problem at the link layer. "Failure"
means the command was received and possibly executed to some extent,
but the device returned Check Condition status. "Success" means the
same as failure except that the device returned Okay status rather than
Check Condition.
So for an error, the residue is meaningless (although you could say
that it was equal to the full transfer length if you want). For a
failure or a success it is meaningful, and it need not be the same as
the amount of data transferred.
Incidentally, as long as we're trying to be precise about terminology,
the correct term is "residue", not "residual". In fact, the last time
I checked a copy of the SCSI spec the word "residual" did not occur
anywhere in it.
> > >> * What about corner values? What does 0 or full resid count on
> > >> failure mean?
> > >
> > > 0 means everything transferred, full residual means nothing did.
> >
> > Yeap, I was wondering about the combination 0 resid count + failure.
> > What would it mean? All bytes are valid but the command failed?
>
> Well, there are certain SCSI conditions called deferred errors and the
> like where we return Check Condition but everything's OK, redisual count
> should be zero, same goes for recovered errors ... there are actually
> lots of things we can get back as an "error" which means I'm warning you
> of something, but the transfer was OK. Likewise we get unit attentions
> (essentialy AENs) which mean I'm telling you something before you start,
> so please try again. Here residual would be the full transfer. Also,
> we have the nasty USB case where no error return but an actual residual
> tells you something really went wrong.
These should all be described either as failures or as successes with
a partial transfer, not as errors.
Alan Stern
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 8:58 ` Boaz Harrosh
@ 2009-05-12 15:00 ` FUJITA Tomonori
2009-05-12 15:08 ` Boaz Harrosh
2009-05-12 15:16 ` FUJITA Tomonori
0 siblings, 2 replies; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-12 15:00 UTC (permalink / raw)
To: bharrosh
Cc: fujita.tomonori, tj, axboe, linux-kernel, jeff, linux-ide,
James.Bottomley, linux-scsi, bzolnier, petkovbb, sshtylyov,
mike.miller, Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Tue, 12 May 2009 11:58:28 +0300
Boaz Harrosh <bharrosh@panasas.com> wrote:
> On 05/11/2009 05:59 PM, FUJITA Tomonori wrote:
> > On Mon, 11 May 2009 14:31:41 +0300
> > Boaz Harrosh <bharrosh@panasas.com> wrote:
> >
> >>>>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> >>>>> index 3da02e4..6605ec9 100644
> >>>>> --- a/drivers/scsi/libsas/sas_expander.c
> >>>>> +++ b/drivers/scsi/libsas/sas_expander.c
> >>>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> >>>>> bio_data(rsp->bio), rsp->data_len);
> >>>>> if (ret > 0) {
> >>>>> /* positive number is the untransferred residual */
> >>>>> - rsp->data_len = ret;
> >>>>> - req->data_len = 0;
> >>>>> + rsp->resid_len = ret;
> >>>>> ret = 0;
> >>>>> - } else if (ret == 0) {
> >>>>> - rsp->data_len = 0;
> >>>>> - req->data_len = 0;
> >>>>> }
> >>>>>
> >>>>> return ret;
> >>>> This is actually a bug fix, as well as a strait conversion
> >>> Can you elaborate a bit about the bug fix part?
> >>>
> >> Nothing big really, just that before (according to the comment), the theoretical
> >> negative case would be full-residual. and now it is zero (untouched).
> >>
> >> I know that in iscsi a negative residual is possible which means over-flow. That is:
> >> the target had more data to give then the buffer had space for. (which is not an error at all)
> >
> > Hmm, iSCSI? This code is for SAS management Protocol.
> >
>
> I gave that as an example of what the scsi standard says about negative
> residual count return from the target. If SAS as sepecific and different
> meaning to negative residual, it should be noted and handled.
Please read the code first.
If sas_smp_handler() returns a negative value, a lld doesn't transfer
anything. The original code used full-residual. The original code is
fine. Your 'this is a bug fix' claim is wrong. We need to revert the
original behavior though.
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 15:00 ` FUJITA Tomonori
@ 2009-05-12 15:08 ` Boaz Harrosh
2009-05-12 15:16 ` FUJITA Tomonori
1 sibling, 0 replies; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-12 15:08 UTC (permalink / raw)
To: FUJITA Tomonori
Cc: tj, axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On 05/12/2009 06:00 PM, FUJITA Tomonori wrote:
> On Tue, 12 May 2009 11:58:28 +0300
> Boaz Harrosh <bharrosh@panasas.com> wrote:
>
>> On 05/11/2009 05:59 PM, FUJITA Tomonori wrote:
>>> On Mon, 11 May 2009 14:31:41 +0300
>>> Boaz Harrosh <bharrosh@panasas.com> wrote:
>>>
>>>>>>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
>>>>>>> index 3da02e4..6605ec9 100644
>>>>>>> --- a/drivers/scsi/libsas/sas_expander.c
>>>>>>> +++ b/drivers/scsi/libsas/sas_expander.c
>>>>>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
>>>>>>> bio_data(rsp->bio), rsp->data_len);
>>>>>>> if (ret > 0) {
>>>>>>> /* positive number is the untransferred residual */
>>>>>>> - rsp->data_len = ret;
>>>>>>> - req->data_len = 0;
>>>>>>> + rsp->resid_len = ret;
>>>>>>> ret = 0;
>>>>>>> - } else if (ret == 0) {
>>>>>>> - rsp->data_len = 0;
>>>>>>> - req->data_len = 0;
>>>>>>> }
>>>>>>>
>>>>>>> return ret;
>>>>>> This is actually a bug fix, as well as a strait conversion
>>>>> Can you elaborate a bit about the bug fix part?
>>>>>
>>>> Nothing big really, just that before (according to the comment), the theoretical
>>>> negative case would be full-residual. and now it is zero (untouched).
>>>>
>>>> I know that in iscsi a negative residual is possible which means over-flow. That is:
>>>> the target had more data to give then the buffer had space for. (which is not an error at all)
>>> Hmm, iSCSI? This code is for SAS management Protocol.
>>>
>> I gave that as an example of what the scsi standard says about negative
>> residual count return from the target. If SAS as sepecific and different
>> meaning to negative residual, it should be noted and handled.
>
> Please read the code first.
>
> If sas_smp_handler() returns a negative value, a lld doesn't transfer
> anything. The original code used full-residual. The original code is
> fine. Your 'this is a bug fix' claim is wrong. We need to revert the
> original behavior though.
Please read my full reply, I said yes old code was better, but not
good enough, error status must be returned also in this case.
This code is already submitted are you sending a fix?
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 15:00 ` FUJITA Tomonori
2009-05-12 15:08 ` Boaz Harrosh
@ 2009-05-12 15:16 ` FUJITA Tomonori
1 sibling, 0 replies; 73+ messages in thread
From: FUJITA Tomonori @ 2009-05-12 15:16 UTC (permalink / raw)
To: bharrosh
Cc: tj, axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Wed, 13 May 2009 00:00:47 +0900
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> On Tue, 12 May 2009 11:58:28 +0300
> Boaz Harrosh <bharrosh@panasas.com> wrote:
>
> > On 05/11/2009 05:59 PM, FUJITA Tomonori wrote:
> > > On Mon, 11 May 2009 14:31:41 +0300
> > > Boaz Harrosh <bharrosh@panasas.com> wrote:
> > >
> > >>>>> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> > >>>>> index 3da02e4..6605ec9 100644
> > >>>>> --- a/drivers/scsi/libsas/sas_expander.c
> > >>>>> +++ b/drivers/scsi/libsas/sas_expander.c
> > >>>>> @@ -1936,12 +1936,8 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
> > >>>>> bio_data(rsp->bio), rsp->data_len);
> > >>>>> if (ret > 0) {
> > >>>>> /* positive number is the untransferred residual */
> > >>>>> - rsp->data_len = ret;
> > >>>>> - req->data_len = 0;
> > >>>>> + rsp->resid_len = ret;
> > >>>>> ret = 0;
> > >>>>> - } else if (ret == 0) {
> > >>>>> - rsp->data_len = 0;
> > >>>>> - req->data_len = 0;
> > >>>>> }
> > >>>>>
> > >>>>> return ret;
> > >>>> This is actually a bug fix, as well as a strait conversion
> > >>> Can you elaborate a bit about the bug fix part?
> > >>>
> > >> Nothing big really, just that before (according to the comment), the theoretical
> > >> negative case would be full-residual. and now it is zero (untouched).
> > >>
> > >> I know that in iscsi a negative residual is possible which means over-flow. That is:
> > >> the target had more data to give then the buffer had space for. (which is not an error at all)
> > >
> > > Hmm, iSCSI? This code is for SAS management Protocol.
> > >
> >
> > I gave that as an example of what the scsi standard says about negative
> > residual count return from the target. If SAS as sepecific and different
> > meaning to negative residual, it should be noted and handled.
>
> Please read the code first.
>
> If sas_smp_handler() returns a negative value, a lld doesn't transfer
Oops, smp_execute_task()
> anything. The original code used full-residual. The original code is
> fine. Your 'this is a bug fix' claim is wrong. We need to revert the
> original behavior though.
Note that you could claim that we should handle residual here when you
find SAS_DATA_OVERRUN in smp_execute_task(). I guess that it means
INVALID_REQUEST_FRAME_LENGTH; the driver sent the data and doesn't get
anything. So we could do better about residual for the error but I
didn't know about the lld spec and I kept the code that the vendor
submitted.
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 14:08 ` James Bottomley
2009-05-12 14:34 ` Alan Stern
@ 2009-05-12 15:17 ` Tejun Heo
2009-05-12 15:45 ` James Bottomley
1 sibling, 1 reply; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 15:17 UTC (permalink / raw)
To: James Bottomley
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
Hello, James.
James Bottomley wrote:
>> I think it's more like how many bytes are valid where the validity is
>> defined as the number of meaningful bytes on dev -> host commands and
>> the number of bytes the device actually consumed on the other
>> direction. Please note that this is different from the number of
>> bytes transferred due to padding or under other error conditions.
>
> For failed commands we don't have that information. All we know is how
> many bytes were actually transferred (because the HBA keeps a count), so
> it's the actual transfer count we use to construct the residual. No
> imputation of validity or otherwise. It just says I transferred this
> amount, based on the error make of it what you will.
Hmmm... so two separate meaning depending on command success/failure?
I doubt high level code or user application can make much use out of
raw transfer byte count. It doesn't mean all that much as it varies
depending on specific transport protocol in use.
>>>> * What about corner values? What does 0 or full resid count on
>>>> failure mean?
>>> 0 means everything transferred, full residual means nothing did.
>> Yeap, I was wondering about the combination 0 resid count + failure.
>> What would it mean? All bytes are valid but the command failed?
>
> Well, there are certain SCSI conditions called deferred errors and
> the like where we return Check Condition but everything's OK,
> redisual count should be zero, same goes for recovered errors
> ... there are actually lots of things we can get back as an "error"
> which means I'm warning you of something, but the transfer was OK.
Shouldn't those be request successful w/ sense data? Please note that
the term "error" in this context means failure of block layer request
not SCSI layer CHECK SENSE.
> Likewise we get unit attentions (essentialy AENs) which mean I'm
> telling you something before you start, so please try again. Here
> residual would be the full transfer.
And these are request failures.
> Also, we have the nasty USB case where no error return but an actual
> residual tells you something really went wrong.
This is something to be interpreted by lld, be it usb or scsi layer,
from block layer POV, if it's partial completion, it's success w/
residue count. If nothing really happened, it's request failure.
>> The behavior wasn't guaranteed before the change in paths including
>> SG_IO fast fail one. libata and ide have been and are completely
>> funky about residual counts anyway so I highly doubt anyone has been
>> depending on it.
>>
>> There's nothing wrong with keeping the original behavior in itself but
>> to me it looks like it would be a bad precedence when no one should
>> depend on the behavior.
>
> OK, that's what we'll do then, thanks.
I'm still reluctant to do it because...
* Its definition still isn't clear (well, at least to me) and if it's
defined as the number of valid bytes on request success and the
number of bytes HBA transferred on request failure, I don't think
it's all that useful.
* Seen from userland, residue count on request failure has never been
guaranteed and there doesn't seem to be any valid in kernel user.
* It would be extra code explicitly setting the residue count to full
on failure path. If it's something necessary, full residue count on
failure needs to be made default. If not, it will only add more
confusion.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 11:08 ` Boaz Harrosh
@ 2009-05-12 15:20 ` Tejun Heo
2009-05-12 15:53 ` Boaz Harrosh
0 siblings, 1 reply; 73+ messages in thread
From: Tejun Heo @ 2009-05-12 15:20 UTC (permalink / raw)
To: Boaz Harrosh
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
Boaz Harrosh wrote:
> The solution to this, I think, is that the bouncing layer should
> receive a residual count, and not bounce anything beyond what's
> transferred. (On reads, writes does nothing), and zero-out the
> rest. This of course means that all block drivers make sure residual
> is properly set, the way it should as explained in this
> thread. (SCSI does the right thing where it can, for example see
> scsi_execute())
Umm... shouldn't the request just be successfully finished with
positive residue count and with sense data if necessary? Block layer
request failure means, and has always meant, complete failure.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 15:17 ` Tejun Heo
@ 2009-05-12 15:45 ` James Bottomley
2009-05-13 6:30 ` Tejun Heo
0 siblings, 1 reply; 73+ messages in thread
From: James Bottomley @ 2009-05-12 15:45 UTC (permalink / raw)
To: Tejun Heo
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
On Wed, 2009-05-13 at 00:17 +0900, Tejun Heo wrote:
> Hello, James.
>
> James Bottomley wrote:
> >> I think it's more like how many bytes are valid where the validity is
> >> defined as the number of meaningful bytes on dev -> host commands and
> >> the number of bytes the device actually consumed on the other
> >> direction. Please note that this is different from the number of
> >> bytes transferred due to padding or under other error conditions.
> >
> > For failed commands we don't have that information. All we know is how
> > many bytes were actually transferred (because the HBA keeps a count), so
> > it's the actual transfer count we use to construct the residual. No
> > imputation of validity or otherwise. It just says I transferred this
> > amount, based on the error make of it what you will.
>
> Hmmm... so two separate meaning depending on command success/failure?
> I doubt high level code or user application can make much use out of
> raw transfer byte count. It doesn't mean all that much as it varies
> depending on specific transport protocol in use.
Well, no, the definition is the same in both cases: how much data went
over the wire. In the success case, you assume that means the device
processed it correctly. In the failure case you need to interpret the
error (and possibly device specific knowledge) to determine what it
means.
> >>>> * What about corner values? What does 0 or full resid count on
> >>>> failure mean?
> >>> 0 means everything transferred, full residual means nothing did.
> >> Yeap, I was wondering about the combination 0 resid count + failure.
> >> What would it mean? All bytes are valid but the command failed?
> >
> > Well, there are certain SCSI conditions called deferred errors and
> > the like where we return Check Condition but everything's OK,
> > redisual count should be zero, same goes for recovered errors
> > ... there are actually lots of things we can get back as an "error"
> > which means I'm warning you of something, but the transfer was OK.
>
> Shouldn't those be request successful w/ sense data? Please note that
> the term "error" in this context means failure of block layer request
> not SCSI layer CHECK SENSE.
Heh, well, this is where we get into interpretations. For SG_IO
requests, we have three separate ways of returning error. The error
return to the block layer, the results return and the sense code. The
error to block is a somewhat later addition to the layer, so not all
cases are handled right or agreed (for instance we just altered BLOCK_PC
with recovered error from -EIO to no error). So hopefully we've just
decided that deferred and current but recovered all fall into the no
error to block, but results and sense to the user.
Note that the error to block is basically discarded from SG_IO before we
return to the user, so the user *only* has results and sense to go by,
thus the concept of residual not valid on error to block is something
the user can't check. That's why a consistent definition in all cases
(i.e. the amount of data the HBA transferred) is the correct one and
allows userspace to make the determination of what it should do based on
the returns it gets.
> > Likewise we get unit attentions (essentialy AENs) which mean I'm
> > telling you something before you start, so please try again. Here
> > residual would be the full transfer.
>
> And these are request failures.
>
> > Also, we have the nasty USB case where no error return but an actual
> > residual tells you something really went wrong.
>
> This is something to be interpreted by lld, be it usb or scsi layer,
> from block layer POV, if it's partial completion, it's success w/
> residue count. If nothing really happened, it's request failure.
>
> >> The behavior wasn't guaranteed before the change in paths including
> >> SG_IO fast fail one. libata and ide have been and are completely
> >> funky about residual counts anyway so I highly doubt anyone has been
> >> depending on it.
> >>
> >> There's nothing wrong with keeping the original behavior in itself but
> >> to me it looks like it would be a bad precedence when no one should
> >> depend on the behavior.
> >
> > OK, that's what we'll do then, thanks.
>
> I'm still reluctant to do it because...
>
> * Its definition still isn't clear (well, at least to me) and if it's
> defined as the number of valid bytes on request success and the
> number of bytes HBA transferred on request failure, I don't think
> it's all that useful.
It's not valid bytes in either case ... it's number transferred. One
can infer from a successful SCSI status code that number transferred ==
valid bytes, but I'd rather we didn't say that.
> * Seen from userland, residue count on request failure has never been
> guaranteed and there doesn't seem to be any valid in kernel user.
But that's the point ... we don't define for userland what request
failure is very well.
> * It would be extra code explicitly setting the residue count to full
> on failure path. If it's something necessary, full residue count on
> failure needs to be made default. If not, it will only add more
> confusion.
OK, so if what you're asking is that we can regard the residue as
invalid if SG_IO itself returns an error, then I can agree ... but not
if blk_end_request() returns error, because that error gets ignored by
SG_IO.
James
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 15:20 ` Tejun Heo
@ 2009-05-12 15:53 ` Boaz Harrosh
0 siblings, 0 replies; 73+ messages in thread
From: Boaz Harrosh @ 2009-05-12 15:53 UTC (permalink / raw)
To: Tejun Heo
Cc: axboe, linux-kernel, jeff, linux-ide, James.Bottomley,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, fujita.tomonori, zaitcev, Geert.Uytterhoeven,
sfr, grant.likely, paul.clements, tim, jeremy, adrian, oakad,
dwmw2, schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
Doug Gilbert, Darrick J. Wong
On 05/12/2009 06:20 PM, Tejun Heo wrote:
> Boaz Harrosh wrote:
>
>> The solution to this, I think, is that the bouncing layer should
>> receive a residual count, and not bounce anything beyond what's
>> transferred. (On reads, writes does nothing), and zero-out the
>> rest. This of course means that all block drivers make sure residual
>> is properly set, the way it should as explained in this
>> thread. (SCSI does the right thing where it can, for example see
>> scsi_execute())
>
> Umm... shouldn't the request just be successfully finished with
> positive residue count and with sense data if necessary? Block layer
> request failure means, and has always meant, complete failure.
>
I see, however if so then bouncing must take into consideration the residual
count in the successful case, so not to copy garbage bytes. And drivers audited
to make sure residual is set accordingly.
I wish we would set resid_len to data_len at begining and let drivers
reset that on success properly, like SCSI does. I'll look at it farther
when I have a bit of time.
Finally I see a distinct separate usage for the request->error member?
> Thanks.
>
Thanks
Boaz
^ permalink raw reply [flat|nested] 73+ messages in thread
* Re: [PATCH 03/11] block: add rq->resid_len
2009-05-12 15:45 ` James Bottomley
@ 2009-05-13 6:30 ` Tejun Heo
0 siblings, 0 replies; 73+ messages in thread
From: Tejun Heo @ 2009-05-13 6:30 UTC (permalink / raw)
To: James Bottomley
Cc: FUJITA Tomonori, bharrosh, axboe, linux-kernel, jeff, linux-ide,
linux-scsi, bzolnier, petkovbb, sshtylyov, mike.miller,
Eric.Moore, stern, zaitcev, Geert.Uytterhoeven, sfr,
grant.likely, paul.clements, tim, jeremy, adrian, oakad, dwmw2,
schwidefsky, ballabio_dario, davem, rusty, Markus.Lidel,
dgilbert, djwong
Hello, James.
James Bottomley wrote:
>> Shouldn't those be request successful w/ sense data? Please note that
>> the term "error" in this context means failure of block layer request
>> not SCSI layer CHECK SENSE.
>
> Heh, well, this is where we get into interpretations. For SG_IO
> requests, we have three separate ways of returning error. The error
> return to the block layer, the results return and the sense code. The
> error to block is a somewhat later addition to the layer, so not all
> cases are handled right or agreed (for instance we just altered BLOCK_PC
> with recovered error from -EIO to no error). So hopefully we've just
> decided that deferred and current but recovered all fall into the no
> error to block, but results and sense to the user.
>
> Note that the error to block is basically discarded from SG_IO before we
> return to the user, so the user *only* has results and sense to go by,
> thus the concept of residual not valid on error to block is something
> the user can't check. That's why a consistent definition in all cases
> (i.e. the amount of data the HBA transferred) is the correct one and
> allows userspace to make the determination of what it should do based on
> the returns it gets.
Okay, I was thinking SG_IO will return error for rq failures and I
remember pretty clearly following the failure path recently while
debugging eject problem but my memory is pretty unreliable.
Checking... oops, yeap, you're right.
>> I'm still reluctant to do it because...
>>
>> * Its definition still isn't clear (well, at least to me) and if it's
>> defined as the number of valid bytes on request success and the
>> number of bytes HBA transferred on request failure, I don't think
>> it's all that useful.
>
> It's not valid bytes in either case ... it's number transferred. One
> can infer from a successful SCSI status code that number transferred ==
> valid bytes, but I'd rather we didn't say that.
>
>> * Seen from userland, residue count on request failure has never been
>> guaranteed and there doesn't seem to be any valid in kernel user.
>
> But that's the point ... we don't define for userland what request
> failure is very well.
>
>> * It would be extra code explicitly setting the residue count to full
>> on failure path. If it's something necessary, full residue count on
>> failure needs to be made default. If not, it will only add more
>> confusion.
>
> OK, so if what you're asking is that we can regard the residue as
> invalid if SG_IO itself returns an error, then I can agree ... but not
> if blk_end_request() returns error, because that error gets ignored by
> SG_IO.
I was confused that rq failure would cause error return from SG_IO.
Sorry about that. There still is a problem tho. Buffer for a bounced
SG_IO request is copied back on failure but when a bounced kernel PC
request fails, the data is not copied back in bio_copy_kern_endio().
This is what would break Boaz's code.
So, it seems what we should do is
1. Always copy back bounced buffer whether the request failed or not.
Whether resid_len should be considered while copying back, I'm not
sure about given that resid_len isn't properly implemented in some
drivers.
2. Revert the original behavior of setting resid_len to full on
request issue and audit the affected code paths.
How does it sound?
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 73+ messages in thread
end of thread, other threads:[~2009-05-13 6:33 UTC | newest]
Thread overview: 73+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-05-04 7:58 [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2 Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 01/11] nbd: don't clear rq->sector and nr_sectors unnecessarily Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 02/11] ide-tape: don't initialize rq->sector for rw requests Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 03/11] block: add rq->resid_len Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 12:08 ` Sergei Shtylyov
2009-05-05 3:41 ` Tejun Heo
2009-05-07 10:23 ` FUJITA Tomonori
2009-05-10 14:07 ` Boaz Harrosh
2009-05-10 23:48 ` Tejun Heo
2009-05-11 5:49 ` FUJITA Tomonori
2009-05-11 14:18 ` James Bottomley
2009-05-11 15:03 ` FUJITA Tomonori
2009-05-11 15:13 ` James Bottomley
2009-05-11 23:47 ` FUJITA Tomonori
2009-05-12 0:19 ` Tejun Heo
2009-05-12 3:43 ` James Bottomley
2009-05-12 6:04 ` Tejun Heo
2009-05-12 14:08 ` James Bottomley
2009-05-12 14:34 ` Alan Stern
2009-05-12 14:34 ` Alan Stern
2009-05-12 15:17 ` Tejun Heo
2009-05-12 15:45 ` James Bottomley
2009-05-13 6:30 ` Tejun Heo
2009-05-11 11:31 ` Boaz Harrosh
2009-05-11 14:59 ` FUJITA Tomonori
2009-05-12 8:58 ` Boaz Harrosh
2009-05-12 15:00 ` FUJITA Tomonori
2009-05-12 15:08 ` Boaz Harrosh
2009-05-12 15:16 ` FUJITA Tomonori
2009-05-12 0:27 ` Tejun Heo
2009-05-12 8:46 ` Boaz Harrosh
2009-05-12 9:07 ` Tejun Heo
2009-05-12 9:10 ` Tejun Heo
2009-05-12 9:52 ` Boaz Harrosh
2009-05-12 10:06 ` Tejun Heo
2009-05-12 11:08 ` Boaz Harrosh
2009-05-12 15:20 ` Tejun Heo
2009-05-12 15:53 ` Boaz Harrosh
2009-05-04 7:58 ` [PATCH 04/11] block: implement blk_rq_pos/[cur_]sectors() and convert obvious ones Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 13:45 ` Sergei Shtylyov
2009-05-05 3:42 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 05/11] block: convert to pos and nr_sectors accessors Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 19:48 ` Adrian McMenamin
2009-05-05 3:42 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 06/11] ide: convert to rq " Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 07/11] block: drop request->hard_* and *nr_sectors Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 08/11] block: cleanup rq->data_len usages Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 14:41 ` Sergei Shtylyov
2009-05-11 12:02 ` Boaz Harrosh
2009-05-04 7:58 ` [PATCH 09/11] ide: " Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 10/11] block: hide request sector and data_len Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-04 7:58 ` [PATCH 11/11] block: blk_rq_[cur_]_{sectors|bytes}() usage cleanup Tejun Heo
2009-05-04 7:58 ` Tejun Heo
2009-05-05 3:59 ` [GIT PATCH] block,scsi,ide: unify sector and data_len, take#2 Tejun Heo
2009-05-05 3:59 ` Tejun Heo
2009-05-07 2:48 ` Tejun Heo
2009-05-07 2:48 ` Tejun Heo
2009-05-07 10:23 ` FUJITA Tomonori
2009-05-08 2:06 ` FUJITA Tomonori
2009-05-08 9:11 ` Tejun Heo
2009-05-11 12:06 ` Boaz Harrosh
2009-05-12 0:49 ` Tejun Heo
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