[Qemu-devel] [PULL 00/43] Block layer patches

[Qemu-devel] [PULL 00/43] Block layer patches

[Kevin Wolf]

The following changes since commit 60a0f1af07d685c88f4ffa09370da5bd7514823e:

  Merge remote-tracking branch 'remotes/kraxel/tags/pull-ipxe-20160704-1' into staging (2016-07-05 12:46:18 +0100)

are available in the git repository at:


  git://repo.or.cz/qemu/kevin.git tags/for-upstream

for you to fetch changes up to b0aaca4d7ff6f03acb9b2c0bc2f0d89267cc5dce:

  Merge remote-tracking branch 'mreitz/tags/pull-block-for-kevin-2016-07-05-v2' into queue-block (2016-07-05 16:55:31 +0200)

----------------------------------------------------------------

Block layer patches

----------------------------------------------------------------
Denis V. Lunev (2):
      qemu-img: fix failed autotests
      block: fix return code for partial write for Linux AIO

Eric Blake (22):
      block: Tighter assertions on bdrv_aligned_pwritev()
      block: Document supported flags during bdrv_aligned_preadv()
      block: Fix harmless off-by-one in bdrv_aligned_preadv()
      nbd: Allow larger requests
      nbd: Advertise realistic limits to block layer
      iscsi: Advertise realistic limits to block layer
      scsi: Advertise limits by blocksize, not 512
      block: Give nonzero result to blk_get_max_transfer_length()
      blkdebug: Set request_alignment during .bdrv_refresh_limits()
      iscsi: Set request_alignment during .bdrv_refresh_limits()
      qcow2: Set request_alignment during .bdrv_refresh_limits()
      raw-win32: Set request_alignment during .bdrv_refresh_limits()
      block: Set request_alignment during .bdrv_refresh_limits()
      block: Set default request_alignment during bdrv_refresh_limits()
      block: Switch transfer length bounds to byte-based
      block: Wording tweaks to write zeroes limits
      block: Switch discard length bounds to byte-based
      block: Drop raw_refresh_limits()
      block: Split bdrv_merge_limits() from bdrv_refresh_limits()
      block: Move request_alignment into BlockLimit
      block: Fix error message style
      block: Use bool as appropriate for BDS members

Kevin Wolf (19):
      block/qdev: Fix NULL access when using BB twice
      vvfat: Use BdrvChild for s->qcow
      blkreplay: Convert to byte-based I/O
      vhdx: Some more BlockBackend use in vhdx_create()
      block: Convert bdrv_co_readv() to BdrvChild
      block: Convert bdrv_co_writev() to BdrvChild
      block: Convert bdrv_aio_readv() to BdrvChild
      block: Convert bdrv_aio_writev() to BdrvChild
      block: Convert bdrv_co_do_readv/writev to BdrvChild
      block: Move bdrv_commit() to block/commit.c
      block: Use BlockBackend for I/O in bdrv_commit()
      block: Convert bdrv_read() to BdrvChild
      block: Convert bdrv_write() to BdrvChild
      block: Convert bdrv_pread(v) to BdrvChild
      block: Convert bdrv_pwrite(v/_sync) to BdrvChild
      block: Convert bdrv_pwrite_zeroes() to BdrvChild
      block: Convert bdrv_prwv_co() to BdrvChild
      block: Convert bdrv_co_preadv/pwritev to BdrvChild
      Merge remote-tracking branch 'mreitz/tags/pull-block-for-kevin-2016-07-05-v2' into queue-block

Peter Maydell (1):
      block/qcow2: Don't use cpu_to_*w()

 block.c                          | 142 +++--------------------
 block/Makefile.objs              |   3 +-
 block/blkdebug.c                 |  23 +++-
 block/blkreplay.c                |  18 +--
 block/blkverify.c                |   8 +-
 block/block-backend.c            |  18 ++-
 block/bochs.c                    |  17 ++-
 block/cloop.c                    |  17 ++-
 block/commit.c                   | 121 ++++++++++++++++++++
 block/crypto.c                   |  10 +-
 block/dmg.c                      |  30 +++--
 block/io.c                       | 238 +++++++++++++++++++++------------------
 block/iscsi.c                    |  45 ++++----
 block/linux-aio.c                |   2 +-
 block/nbd-client.c               |   4 -
 block/nbd.c                      |   4 +-
 block/parallels.c                |  16 +--
 block/qcow.c                     |  78 ++++++++++---
 block/qcow2-cache.c              |   4 +-
 block/qcow2-cluster.c            |  20 ++--
 block/qcow2-refcount.c           |  47 ++++----
 block/qcow2-snapshot.c           |  26 ++---
 block/qcow2.c                    | 102 ++++++++++++-----
 block/qed-table.c                |   4 +-
 block/qed.c                      |  22 ++--
 block/quorum.c                   |   8 +-
 block/raw-posix.c                |  24 ++--
 block/raw-win32.c                |  10 +-
 block/raw_bsd.c                  |  14 +--
 block/vdi.c                      |  14 +--
 block/vhdx-log.c                 |  12 +-
 block/vhdx.c                     |  85 +++++++-------
 block/vmdk.c                     |  54 ++++-----
 block/vpc.c                      |  24 ++--
 block/vvfat.c                    |  74 ++++++++----
 hw/block/virtio-blk.c            |  10 +-
 hw/core/qdev-properties-system.c |   2 +-
 hw/scsi/scsi-generic.c           |  15 +--
 include/block/block.h            |  46 ++++----
 include/block/block_int.h        |  63 +++++++----
 include/block/nbd.h              |   2 +
 include/sysemu/block-backend.h   |   3 +-
 qapi/block-core.json             |   3 +-
 qemu-img.c                       |  13 ++-
 44 files changed, 843 insertions(+), 652 deletions(-)

[Qemu-devel] [PULL 01/43] qemu-img: fix failed autotests

[Kevin Wolf]

From: "Denis V. Lunev" <den@openvz.org>

There are 9 iotests failed on Ubuntu 15.10 at the moment.
The problem is that options parsing in qemu-img is broken by the
following commit:
    commit 10985131e337a0c52c5bd1e191fd7867a6ff8d02
    Author: Denis V. Lunev <den@openvz.org>
    Date:   Fri Jun 17 17:44:13 2016 +0300
    qemu-img: move common options parsing before commands processing

This strange command line reports error
  ./qemu-img create -f qcow2 TEST_DIR/t.qcow2 -- 1024
  qemu-img: Invalid image size specified!
while original code parses it successfully.

The problem is that getopt_long state should be reset. This could be done
using this assignment according to the manual:
    optind = 0

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Eric Blake <eblake@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qemu-img.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qemu-img.c b/qemu-img.c
index 3322a1e..2351686 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -3866,7 +3866,7 @@ int main(int argc, char **argv)
         return 0;
     }
     argv += optind;
-    optind = 1;
+    optind = 0;
 
     if (!trace_init_backends()) {
         exit(1);
-- 
1.8.3.1

[Qemu-devel] [PULL 02/43] block: Tighter assertions on bdrv_aligned_pwritev()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

For symmetry with bdrv_aligned_preadv(), assert that the caller
really has aligned things properly. This requires adding an align
parameter, which is used now only in the new asserts, but will
come in handy in a later patch that adds auto-fragmentation to the
max transfer size, since that value need not always be a multiple
of the alignment, and therefore must be rounded down.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/block/io.c b/block/io.c
index 7cf3645..b95e856 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1254,7 +1254,7 @@ fail:
  */
 static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
     BdrvTrackedRequest *req, int64_t offset, unsigned int bytes,
-    QEMUIOVector *qiov, int flags)
+    int64_t align, QEMUIOVector *qiov, int flags)
 {
     BlockDriver *drv = bs->drv;
     bool waited;
@@ -1263,6 +1263,9 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
     int64_t start_sector = offset >> BDRV_SECTOR_BITS;
     int64_t end_sector = DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE);
 
+    assert(is_power_of_2(align));
+    assert((offset & (align - 1)) == 0);
+    assert((bytes & (align - 1)) == 0);
     assert(!qiov || bytes == qiov->size);
     assert((bs->open_flags & BDRV_O_NO_IO) == 0);
     assert(!(flags & ~BDRV_REQ_MASK));
@@ -1349,7 +1352,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
 
         memset(buf + head_padding_bytes, 0, zero_bytes);
         ret = bdrv_aligned_pwritev(bs, req, offset & ~(align - 1), align,
-                                   &local_qiov,
+                                   align, &local_qiov,
                                    flags & ~BDRV_REQ_ZERO_WRITE);
         if (ret < 0) {
             goto fail;
@@ -1362,7 +1365,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
     if (bytes >= align) {
         /* Write the aligned part in the middle. */
         uint64_t aligned_bytes = bytes & ~(align - 1);
-        ret = bdrv_aligned_pwritev(bs, req, offset, aligned_bytes,
+        ret = bdrv_aligned_pwritev(bs, req, offset, aligned_bytes, align,
                                    NULL, flags);
         if (ret < 0) {
             goto fail;
@@ -1386,7 +1389,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
         bdrv_debug_event(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL);
 
         memset(buf, 0, bytes);
-        ret = bdrv_aligned_pwritev(bs, req, offset, align,
+        ret = bdrv_aligned_pwritev(bs, req, offset, align, align,
                                    &local_qiov, flags & ~BDRV_REQ_ZERO_WRITE);
     }
 fail:
@@ -1511,7 +1514,7 @@ int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
         bytes = ROUND_UP(bytes, align);
     }
 
-    ret = bdrv_aligned_pwritev(bs, &req, offset, bytes,
+    ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, align,
                                use_local_qiov ? &local_qiov : qiov,
                                flags);
 
-- 
1.8.3.1

[Qemu-devel] [PULL 03/43] block: Document supported flags during bdrv_aligned_preadv()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We don't pass any flags on to drivers to handle.  Tighten an
assert to explain why we pass 0 to bdrv_driver_preadv(), and add
some comments on things to be aware of if we want to turn on
per-BDS BDRV_REQ_FUA support during reads in the future.  Also,
document that we may want to consider using unmap during
copy-on-read operations where the read is all zeroes.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/block/io.c b/block/io.c
index b95e856..994d3fa 100644
--- a/block/io.c
+++ b/block/io.c
@@ -945,6 +945,9 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs,
 
     if (drv->bdrv_co_pwrite_zeroes &&
         buffer_is_zero(bounce_buffer, iov.iov_len)) {
+        /* FIXME: Should we (perhaps conditionally) be setting
+         * BDRV_REQ_MAY_UNMAP, if it will allow for a sparser copy
+         * that still correctly reads as zero? */
         ret = bdrv_co_do_pwrite_zeroes(bs, cluster_offset, cluster_bytes, 0);
     } else {
         /* This does not change the data on the disk, it is not necessary
@@ -987,7 +990,12 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
     assert((bytes & (align - 1)) == 0);
     assert(!qiov || bytes == qiov->size);
     assert((bs->open_flags & BDRV_O_NO_IO) == 0);
-    assert(!(flags & ~BDRV_REQ_MASK));
+
+    /* TODO: We would need a per-BDS .supported_read_flags and
+     * potential fallback support, if we ever implement any read flags
+     * to pass through to drivers.  For now, there aren't any
+     * passthrough flags.  */
+    assert(!(flags & ~(BDRV_REQ_NO_SERIALISING | BDRV_REQ_COPY_ON_READ)));
 
     /* Handle Copy on Read and associated serialisation */
     if (flags & BDRV_REQ_COPY_ON_READ) {
-- 
1.8.3.1

[Qemu-devel] [PULL 04/43] block: Fix harmless off-by-one in bdrv_aligned_preadv()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

If the amount of data to read ends exactly on the total size
of the bs, then we were wasting time creating a local qiov
to read the data in preparation for what would normally be
appending zeroes beyond the end, even though this corner case
has nothing further to do.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/io.c b/block/io.c
index 994d3fa..82c9ff0 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1036,7 +1036,7 @@ static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs,
     }
 
     max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align);
-    if (bytes < max_bytes) {
+    if (bytes <= max_bytes) {
         ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0);
     } else if (max_bytes > 0) {
         QEMUIOVector local_qiov;
-- 
1.8.3.1

[Qemu-devel] [PULL 05/43] nbd: Allow larger requests

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

The NBD layer was breaking up request at a limit of 2040 sectors
(just under 1M) to cater to old qemu-nbd. But the server limit
was raised to 32M in commit 2d8214885 to match the kernel, more
than three years ago; and the upstream NBD Protocol is proposing
documentation that without any explicit communication to state
otherwise, a client should be able to safely assume that a 32M
transaction will work.  It is time to rely on the larger sizing,
and any downstream distro that cares about maximum
interoperability to older qemu-nbd servers can just tweak the
value of #define NBD_MAX_SECTORS.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/nbd-client.c  | 4 ----
 include/block/nbd.h | 2 ++
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/block/nbd-client.c b/block/nbd-client.c
index 4d13444..420bce8 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -269,10 +269,6 @@ static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num,
     return -reply.error;
 }
 
-/* qemu-nbd has a limit of slightly less than 1M per request.  Try to
- * remain aligned to 4K. */
-#define NBD_MAX_SECTORS 2040
-
 int nbd_client_co_readv(BlockDriverState *bs, int64_t sector_num,
                         int nb_sectors, QEMUIOVector *qiov)
 {
diff --git a/include/block/nbd.h b/include/block/nbd.h
index df1f804..eeda3eb 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -77,6 +77,8 @@ enum {
 
 /* Maximum size of a single READ/WRITE data buffer */
 #define NBD_MAX_BUFFER_SIZE (32 * 1024 * 1024)
+#define NBD_MAX_SECTORS (NBD_MAX_BUFFER_SIZE / BDRV_SECTOR_SIZE)
+
 /* Maximum size of an export name. The NBD spec requires 256 and
  * suggests that servers support up to 4096, but we stick to only the
  * required size so that we can stack-allocate the names, and because
-- 
1.8.3.1

[Qemu-devel] [PULL 06/43] nbd: Advertise realistic limits to block layer

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We were basing the advertisement of maximum discard and transfer
length off of UINT32_MAX, but since the rest of the block layer
has signed int limits on a transaction, nothing could ever reach
that maximum, and we risk overflowing an int once things are
converted to byte-based rather than sector-based limits.  What's
more, we DO have a much smaller limit: both the current kernel
and qemu-nbd have a hard limit of 32M on a read or write
transaction, and while they may also permit up to a full 32 bits
on a discard transaction, the upstream NBD protocol is proposing
wording that without any explicit advertisement otherwise,
clients should limit ALL requests to the same limits as read and
write, even though the other requests do not actually require as
many bytes across the wire.  So the better limit to tell the
block layer is 32M for both values.

Behavior doesn't actually change with this patch (the block layer
is currently ignoring the max_transfer advertisements); but when
that problem is fixed in a later series, this patch will prevent
the exposure of a latent bug.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/nbd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/nbd.c b/block/nbd.c
index 6015e8b..bf67c8a 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -362,8 +362,8 @@ static int nbd_co_flush(BlockDriverState *bs)
 
 static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->bl.max_discard = UINT32_MAX >> BDRV_SECTOR_BITS;
-    bs->bl.max_transfer_length = UINT32_MAX >> BDRV_SECTOR_BITS;
+    bs->bl.max_discard = NBD_MAX_SECTORS;
+    bs->bl.max_transfer_length = NBD_MAX_SECTORS;
 }
 
 static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num,
-- 
1.8.3.1

[Qemu-devel] [PULL 07/43] iscsi: Advertise realistic limits to block layer

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

The function sector_limits_lun2qemu() returns a value in units of
the block layer's 512-byte sector, and can be as large as
0x40000000, which is much larger than the block layer's inherent
limit of BDRV_REQUEST_MAX_SECTORS.  The block layer already
handles '0' as a synonym to the inherent limit, and it is nicer
to return this value than it is to calculate an arbitrary
maximum, for two reasons: we want to ensure that the block layer
continues to special-case '0' as 'no limit beyond the inherent
limits'; and we want to be able to someday expand the block
layer to allow 64-bit limits, where auditing for uses of
BDRV_REQUEST_MAX_SECTORS will help us make sure we aren't
artificially constraining iscsi to old block layer limits.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/iscsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index 9bb5ff6..c5dedb3 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1698,7 +1698,9 @@ static void iscsi_close(BlockDriverState *bs)
 
 static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun)
 {
-    return MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1);
+    int limit = MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1);
+
+    return limit < BDRV_REQUEST_MAX_SECTORS ? limit : 0;
 }
 
 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
-- 
1.8.3.1

[Qemu-devel] [PULL 08/43] scsi: Advertise limits by blocksize, not 512

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

s->blocksize may be larger than 512, in which case our
tweaks to max_xfer_len and opt_xfer_len must be scaled
appropriately.

CC: qemu-stable@nongnu.org
Reported-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/scsi/scsi-generic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 6a2d89a..75e227d 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -225,7 +225,8 @@ static void scsi_read_complete(void * opaque, int ret)
     if (s->type == TYPE_DISK &&
         r->req.cmd.buf[0] == INQUIRY &&
         r->req.cmd.buf[2] == 0xb0) {
-        uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk);
+        uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk) /
+            (s->blocksize / BDRV_SECTOR_SIZE);
         if (max_xfer_len) {
             stl_be_p(&r->buf[8], max_xfer_len);
             /* Also take care of the opt xfer len. */
-- 
1.8.3.1

[Qemu-devel] [PULL 09/43] block: Give nonzero result to blk_get_max_transfer_length()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

Making all callers special-case 0 as unlimited is awkward,
and we DO have a hard maximum of BDRV_REQUEST_MAX_SECTORS given
our current block layer API limits.

In the case of scsi, this means that we now always advertise a
limit to the guest, even in cases where the underlying layers
previously use 0 for no inherent limit beyond the block layer.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/block-backend.c  |  7 ++++---
 hw/block/virtio-blk.c  |  3 +--
 hw/scsi/scsi-generic.c | 12 ++++++------
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 34500e6..1fb070b 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1303,15 +1303,16 @@ int blk_get_flags(BlockBackend *blk)
     }
 }
 
+/* Returns the maximum transfer length, in sectors; guaranteed nonzero */
 int blk_get_max_transfer_length(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
+    int max = 0;
 
     if (bs) {
-        return bs->bl.max_transfer_length;
-    } else {
-        return 0;
+        max = bs->bl.max_transfer_length;
     }
+    return MIN_NON_ZERO(max, BDRV_REQUEST_MAX_SECTORS);
 }
 
 int blk_get_max_iov(BlockBackend *blk)
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index fb43bba..dd94cd4 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -384,7 +384,7 @@ static int multireq_compare(const void *a, const void *b)
 void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
 {
     int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
-    int max_xfer_len = 0;
+    int max_xfer_len;
     int64_t sector_num = 0;
 
     if (mrb->num_reqs == 1) {
@@ -394,7 +394,6 @@ void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
     }
 
     max_xfer_len = blk_get_max_transfer_length(mrb->reqs[0]->dev->blk);
-    max_xfer_len = MIN_NON_ZERO(max_xfer_len, BDRV_REQUEST_MAX_SECTORS);
 
     qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
           &multireq_compare);
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 75e227d..0cb8568 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -227,12 +227,12 @@ static void scsi_read_complete(void * opaque, int ret)
         r->req.cmd.buf[2] == 0xb0) {
         uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk) /
             (s->blocksize / BDRV_SECTOR_SIZE);
-        if (max_xfer_len) {
-            stl_be_p(&r->buf[8], max_xfer_len);
-            /* Also take care of the opt xfer len. */
-            if (ldl_be_p(&r->buf[12]) > max_xfer_len) {
-                stl_be_p(&r->buf[12], max_xfer_len);
-            }
+
+        assert(max_xfer_len);
+        stl_be_p(&r->buf[8], max_xfer_len);
+        /* Also take care of the opt xfer len. */
+        if (ldl_be_p(&r->buf[12]) > max_xfer_len) {
+            stl_be_p(&r->buf[12], max_xfer_len);
         }
     }
     scsi_req_data(&r->req, len);
-- 
1.8.3.1

[Qemu-devel] [PULL 10/43] blkdebug: Set request_alignment during .bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Note that when the user does not provide "align", then we were
defaulting to bs->request_alignment - but at this stage in the
initialization, that was always 512.  We were also rejecting an
explicit "align":0 from the user; this patch now allows that,
as an explicit request for the default alignment (which may not
always be 512 in the future).

qemu-iotests 77 is particularly sensitive to the fact that we
can specify an artificial alignment override in blkdebug, and
that override must continue to work even when limits are
refreshed on an already open device.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/blkdebug.c     | 19 +++++++++++++++----
 qapi/block-core.json |  3 ++-
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/block/blkdebug.c b/block/blkdebug.c
index 20d25bd..54b6870 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -37,6 +37,7 @@
 typedef struct BDRVBlkdebugState {
     int state;
     int new_state;
+    int align;
 
     QLIST_HEAD(, BlkdebugRule) rules[BLKDBG__MAX];
     QSIMPLEQ_HEAD(, BlkdebugRule) active_rules;
@@ -382,10 +383,10 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     /* Set request alignment */
-    align = qemu_opt_get_size(opts, "align", bs->request_alignment);
-    if (align > 0 && align < INT_MAX && !(align & (align - 1))) {
-        bs->request_alignment = align;
-    } else {
+    align = qemu_opt_get_size(opts, "align", 0);
+    if (align < INT_MAX && is_power_of_2(align)) {
+        s->align = align;
+    } else if (align) {
         error_setg(errp, "Invalid alignment");
         ret = -EINVAL;
         goto fail_unref;
@@ -720,6 +721,15 @@ static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options)
     bs->full_open_options = opts;
 }
 
+static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+    BDRVBlkdebugState *s = bs->opaque;
+
+    if (s->align) {
+        bs->request_alignment = s->align;
+    }
+}
+
 static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
                                    BlockReopenQueue *queue, Error **errp)
 {
@@ -738,6 +748,7 @@ static BlockDriver bdrv_blkdebug = {
     .bdrv_getlength         = blkdebug_getlength,
     .bdrv_truncate          = blkdebug_truncate,
     .bdrv_refresh_filename  = blkdebug_refresh_filename,
+    .bdrv_refresh_limits    = blkdebug_refresh_limits,
 
     .bdrv_aio_readv         = blkdebug_aio_readv,
     .bdrv_aio_writev        = blkdebug_aio_writev,
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 98a20d2..ac8f5f6 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1961,7 +1961,8 @@
 #
 # @config:          #optional filename of the configuration file
 #
-# @align:           #optional required alignment for requests in bytes
+# @align:           #optional required alignment for requests in bytes,
+#                   must be power of 2, or 0 for default
 #
 # @inject-error:    #optional array of error injection descriptions
 #
-- 
1.8.3.1

[Qemu-devel] [PULL 11/43] iscsi: Set request_alignment during .bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/iscsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index c5dedb3..721afb7 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1589,7 +1589,6 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
         goto out;
     }
     bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
-    bs->request_alignment = iscsilun->block_size;
 
     /* We don't have any emulation for devices other than disks and CD-ROMs, so
      * this must be sg ioctl compatible. We force it to be sg, otherwise qemu
@@ -1711,6 +1710,8 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
     IscsiLun *iscsilun = bs->opaque;
     uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
 
+    bs->request_alignment = iscsilun->block_size;
+
     if (iscsilun->bl.max_xfer_len) {
         max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
     }
-- 
1.8.3.1

[Qemu-devel] [PULL 12/43] qcow2: Set request_alignment during .bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/qcow2.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 23f666d..48f80b6 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -981,9 +981,6 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
         }
 
         bs->encrypted = 1;
-
-        /* Encryption works on a sector granularity */
-        bs->request_alignment = BDRV_SECTOR_SIZE;
     }
 
     s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */
@@ -1202,6 +1199,10 @@ static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     BDRVQcow2State *s = bs->opaque;
 
+    if (bs->encrypted) {
+        /* Encryption works on a sector granularity */
+        bs->request_alignment = BDRV_SECTOR_SIZE;
+    }
     bs->bl.pwrite_zeroes_alignment = s->cluster_size;
 }
 
-- 
1.8.3.1

[Qemu-devel] [PULL 13/43] raw-win32: Set request_alignment during .bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

In this case, raw_probe_alignment() already did what we needed,
so just fix its signature and wire it in correctly.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/raw-win32.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/raw-win32.c b/block/raw-win32.c
index fd23891..88382d9 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -222,7 +222,7 @@ static void raw_attach_aio_context(BlockDriverState *bs,
     }
 }
 
-static void raw_probe_alignment(BlockDriverState *bs)
+static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
 {
     BDRVRawState *s = bs->opaque;
     DWORD sectorsPerCluster, freeClusters, totalClusters, count;
@@ -365,7 +365,6 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
         win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
     }
 
-    raw_probe_alignment(bs);
     ret = 0;
 fail:
     qemu_opts_del(opts);
@@ -550,6 +549,7 @@ BlockDriver bdrv_file = {
     .bdrv_needs_filename = true,
     .bdrv_parse_filename = raw_parse_filename,
     .bdrv_file_open     = raw_open,
+    .bdrv_refresh_limits = raw_probe_alignment,
     .bdrv_close         = raw_close,
     .bdrv_create        = raw_create,
     .bdrv_has_zero_init = bdrv_has_zero_init_1,
-- 
1.8.3.1

[Qemu-devel] [PULL 14/43] block: Set request_alignment during .bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Add a .bdrv_refresh_limits() to all four of our legacy devices
that will always be sector-only (bochs, cloop, dmg, vvfat), in
spite of their recent conversion to expose a byte interface.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/bochs.c | 7 ++++++-
 block/cloop.c | 7 ++++++-
 block/dmg.c   | 7 ++++++-
 block/vvfat.c | 7 ++++++-
 4 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/block/bochs.c b/block/bochs.c
index 6c8d0f3..182c50b 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -105,7 +105,6 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
     int ret;
 
     bs->read_only = 1; // no write support yet
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
 
     ret = bdrv_pread(bs->file->bs, 0, &bochs, sizeof(bochs));
     if (ret < 0) {
@@ -189,6 +188,11 @@ fail:
     return ret;
 }
 
+static void bochs_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+}
+
 static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
 {
     BDRVBochsState *s = bs->opaque;
@@ -283,6 +287,7 @@ static BlockDriver bdrv_bochs = {
     .instance_size	= sizeof(BDRVBochsState),
     .bdrv_probe		= bochs_probe,
     .bdrv_open		= bochs_open,
+    .bdrv_refresh_limits = bochs_refresh_limits,
     .bdrv_co_preadv = bochs_co_preadv,
     .bdrv_close		= bochs_close,
 };
diff --git a/block/cloop.c b/block/cloop.c
index ea5a92b..d574003 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -67,7 +67,6 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
     int ret;
 
     bs->read_only = 1;
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
 
     /* read header */
     ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4);
@@ -199,6 +198,11 @@ fail:
     return ret;
 }
 
+static void cloop_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+}
+
 static inline int cloop_read_block(BlockDriverState *bs, int block_num)
 {
     BDRVCloopState *s = bs->opaque;
@@ -280,6 +284,7 @@ static BlockDriver bdrv_cloop = {
     .instance_size  = sizeof(BDRVCloopState),
     .bdrv_probe     = cloop_probe,
     .bdrv_open      = cloop_open,
+    .bdrv_refresh_limits = cloop_refresh_limits,
     .bdrv_co_preadv = cloop_co_preadv,
     .bdrv_close     = cloop_close,
 };
diff --git a/block/dmg.c b/block/dmg.c
index 06eb513..1e53cd8 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -439,7 +439,6 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
     int ret;
 
     bs->read_only = 1;
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
 
     s->n_chunks = 0;
     s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
@@ -547,6 +546,11 @@ fail:
     return ret;
 }
 
+static void dmg_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+}
+
 static inline int is_sector_in_chunk(BDRVDMGState* s,
                 uint32_t chunk_num, uint64_t sector_num)
 {
@@ -720,6 +724,7 @@ static BlockDriver bdrv_dmg = {
     .instance_size  = sizeof(BDRVDMGState),
     .bdrv_probe     = dmg_probe,
     .bdrv_open      = dmg_open,
+    .bdrv_refresh_limits = dmg_refresh_limits,
     .bdrv_co_preadv = dmg_co_preadv,
     .bdrv_close     = dmg_close,
 };
diff --git a/block/vvfat.c b/block/vvfat.c
index 5569450..4d44636 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1177,7 +1177,6 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
         bs->read_only = 0;
     }
 
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
     bs->total_sectors = cyls * heads * secs;
 
     if (init_directories(s, dirname, heads, secs, errp)) {
@@ -1209,6 +1208,11 @@ fail:
     return ret;
 }
 
+static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+}
+
 static inline void vvfat_close_current_file(BDRVVVFATState *s)
 {
     if(s->current_mapping) {
@@ -3046,6 +3050,7 @@ static BlockDriver bdrv_vvfat = {
 
     .bdrv_parse_filename    = vvfat_parse_filename,
     .bdrv_file_open         = vvfat_open,
+    .bdrv_refresh_limits    = vvfat_refresh_limits,
     .bdrv_close             = vvfat_close,
 
     .bdrv_co_preadv         = vvfat_co_preadv,
-- 
1.8.3.1

[Qemu-devel] [PULL 15/43] block: Set default request_alignment during bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Now that all drivers have been updated to supply an override
of request_alignment during their .bdrv_refresh_limits(), as
needed, the block layer itself can defer setting the default
alignment until part of the overall bdrv_refresh_limits().

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c    | 1 -
 block/io.c | 3 +++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/block.c b/block.c
index f4648e9..c2fbf06 100644
--- a/block.c
+++ b/block.c
@@ -937,7 +937,6 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
         goto fail_opts;
     }
 
-    bs->request_alignment = drv->bdrv_co_preadv ? 1 : 512;
     bs->read_only = !(bs->open_flags & BDRV_O_RDWR);
 
     if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) {
diff --git a/block/io.c b/block/io.c
index 82c9ff0..323e822 100644
--- a/block/io.c
+++ b/block/io.c
@@ -78,6 +78,9 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
         return;
     }
 
+    /* Default alignment based on whether driver has byte interface */
+    bs->request_alignment = drv->bdrv_co_preadv ? 1 : 512;
+
     /* Take some limits from the children as a default */
     if (bs->file) {
         bdrv_refresh_limits(bs->file->bs, &local_err);
-- 
1.8.3.1

[Qemu-devel] [PULL 16/43] block: Switch transfer length bounds to byte-based

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

Sector-based limits are awkward to think about; in our on-going
quest to move to byte-based interfaces, convert max_transfer_length
and opt_transfer_length.  Rename them (dropping the _length suffix)
so that the compiler will help us catch the change in semantics
across any rebased code, and improve the documentation.  Use unsigned
values, so that we don't have to worry about negative values and
so that bit-twiddling is easier; however, we are still constrained
by 2^31 of signed int in most APIs.

When a value comes from an external source (iscsi and raw-posix),
sanitize the results to ensure that opt_transfer is a power of 2.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/block-backend.c          | 10 +++++-----
 block/io.c                     | 23 +++++++++++------------
 block/iscsi.c                  | 23 +++++++++++++++--------
 block/nbd.c                    |  2 +-
 block/raw-posix.c              |  4 ++--
 hw/block/virtio-blk.c          |  9 +++++----
 hw/scsi/scsi-generic.c         | 12 ++++++------
 include/block/block_int.h      | 13 ++++++++-----
 include/sysemu/block-backend.h |  2 +-
 qemu-img.c                     |  8 ++++----
 10 files changed, 58 insertions(+), 48 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 1fb070b..e042544 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1303,16 +1303,16 @@ int blk_get_flags(BlockBackend *blk)
     }
 }
 
-/* Returns the maximum transfer length, in sectors; guaranteed nonzero */
-int blk_get_max_transfer_length(BlockBackend *blk)
+/* Returns the maximum transfer length, in bytes; guaranteed nonzero */
+uint32_t blk_get_max_transfer(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
-    int max = 0;
+    uint32_t max = 0;
 
     if (bs) {
-        max = bs->bl.max_transfer_length;
+        max = bs->bl.max_transfer;
     }
-    return MIN_NON_ZERO(max, BDRV_REQUEST_MAX_SECTORS);
+    return MIN_NON_ZERO(max, INT_MAX);
 }
 
 int blk_get_max_iov(BlockBackend *blk)
diff --git a/block/io.c b/block/io.c
index 323e822..8ca9d43 100644
--- a/block/io.c
+++ b/block/io.c
@@ -88,8 +88,8 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
             error_propagate(errp, local_err);
             return;
         }
-        bs->bl.opt_transfer_length = bs->file->bs->bl.opt_transfer_length;
-        bs->bl.max_transfer_length = bs->file->bs->bl.max_transfer_length;
+        bs->bl.opt_transfer = bs->file->bs->bl.opt_transfer;
+        bs->bl.max_transfer = bs->file->bs->bl.max_transfer;
         bs->bl.min_mem_alignment = bs->file->bs->bl.min_mem_alignment;
         bs->bl.opt_mem_alignment = bs->file->bs->bl.opt_mem_alignment;
         bs->bl.max_iov = bs->file->bs->bl.max_iov;
@@ -107,12 +107,10 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
             error_propagate(errp, local_err);
             return;
         }
-        bs->bl.opt_transfer_length =
-            MAX(bs->bl.opt_transfer_length,
-                bs->backing->bs->bl.opt_transfer_length);
-        bs->bl.max_transfer_length =
-            MIN_NON_ZERO(bs->bl.max_transfer_length,
-                         bs->backing->bs->bl.max_transfer_length);
+        bs->bl.opt_transfer = MAX(bs->bl.opt_transfer,
+                                  bs->backing->bs->bl.opt_transfer);
+        bs->bl.max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
+                                           bs->backing->bs->bl.max_transfer);
         bs->bl.opt_mem_alignment =
             MAX(bs->bl.opt_mem_alignment,
                 bs->backing->bs->bl.opt_mem_alignment);
@@ -1156,7 +1154,8 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
     return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0);
 }
 
-#define MAX_WRITE_ZEROES_BOUNCE_BUFFER 32768
+/* Maximum buffer for write zeroes fallback, in bytes */
+#define MAX_WRITE_ZEROES_BOUNCE_BUFFER (32768 << BDRV_SECTOR_BITS)
 
 static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
     int64_t offset, int count, BdrvRequestFlags flags)
@@ -1214,7 +1213,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
 
         if (ret == -ENOTSUP) {
             /* Fall back to bounce buffer if write zeroes is unsupported */
-            int max_xfer_len = MIN_NON_ZERO(bs->bl.max_transfer_length,
+            int max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
                                             MAX_WRITE_ZEROES_BOUNCE_BUFFER);
             BdrvRequestFlags write_flags = flags & ~BDRV_REQ_ZERO_WRITE;
 
@@ -1225,7 +1224,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
                 write_flags &= ~BDRV_REQ_FUA;
                 need_flush = true;
             }
-            num = MIN(num, max_xfer_len << BDRV_SECTOR_BITS);
+            num = MIN(num, max_transfer);
             iov.iov_len = num;
             if (iov.iov_base == NULL) {
                 iov.iov_base = qemu_try_blockalign(bs, num);
@@ -1242,7 +1241,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
             /* Keep bounce buffer around if it is big enough for all
              * all future requests.
              */
-            if (num < max_xfer_len << BDRV_SECTOR_BITS) {
+            if (num < max_transfer) {
                 qemu_vfree(iov.iov_base);
                 iov.iov_base = NULL;
             }
diff --git a/block/iscsi.c b/block/iscsi.c
index 721afb7..bde4a04 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -473,9 +473,10 @@ iscsi_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
         return -EINVAL;
     }
 
-    if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
+    if (bs->bl.max_transfer &&
+        nb_sectors << BDRV_SECTOR_BITS > bs->bl.max_transfer) {
         error_report("iSCSI Error: Write of %d sectors exceeds max_xfer_len "
-                     "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
+                     "of %" PRIu32 " bytes", nb_sectors, bs->bl.max_transfer);
         return -EINVAL;
     }
 
@@ -650,9 +651,10 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
         return -EINVAL;
     }
 
-    if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) {
+    if (bs->bl.max_transfer &&
+        nb_sectors << BDRV_SECTOR_BITS > bs->bl.max_transfer) {
         error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len "
-                     "of %d sectors", nb_sectors, bs->bl.max_transfer_length);
+                     "of %" PRIu32 " bytes", nb_sectors, bs->bl.max_transfer);
         return -EINVAL;
     }
 
@@ -1708,7 +1710,7 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
      * iscsi_open(): iscsi targets don't change their limits. */
 
     IscsiLun *iscsilun = bs->opaque;
-    uint32_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
+    uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
 
     bs->request_alignment = iscsilun->block_size;
 
@@ -1716,7 +1718,9 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
         max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
     }
 
-    bs->bl.max_transfer_length = sector_limits_lun2qemu(max_xfer_len, iscsilun);
+    if (max_xfer_len * iscsilun->block_size < INT_MAX) {
+        bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
+    }
 
     if (iscsilun->lbp.lbpu) {
         if (iscsilun->bl.max_unmap < 0xffffffff) {
@@ -1739,8 +1743,11 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
     } else {
         bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
     }
-    bs->bl.opt_transfer_length =
-        sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun);
+    if (iscsilun->bl.opt_xfer_len &&
+        iscsilun->bl.opt_xfer_len < INT_MAX / iscsilun->block_size) {
+        bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
+                                        iscsilun->block_size);
+    }
 }
 
 /* Note that this will not re-establish a connection with an iSCSI target - it
diff --git a/block/nbd.c b/block/nbd.c
index bf67c8a..f5511ea 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -363,7 +363,7 @@ static int nbd_co_flush(BlockDriverState *bs)
 static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     bs->bl.max_discard = NBD_MAX_SECTORS;
-    bs->bl.max_transfer_length = NBD_MAX_SECTORS;
+    bs->bl.max_transfer = NBD_MAX_BUFFER_SIZE;
 }
 
 static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num,
diff --git a/block/raw-posix.c b/block/raw-posix.c
index bef7a67..8da2f94 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -745,8 +745,8 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
     if (!fstat(s->fd, &st)) {
         if (S_ISBLK(st.st_mode)) {
             int ret = hdev_get_max_transfer_length(s->fd);
-            if (ret >= 0) {
-                bs->bl.max_transfer_length = ret;
+            if (ret > 0 && ret <= BDRV_REQUEST_MAX_SECTORS) {
+                bs->bl.max_transfer = pow2floor(ret << BDRV_SECTOR_BITS);
             }
         }
     }
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index dd94cd4..ae86e94 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -384,7 +384,7 @@ static int multireq_compare(const void *a, const void *b)
 void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
 {
     int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
-    int max_xfer_len;
+    uint32_t max_transfer;
     int64_t sector_num = 0;
 
     if (mrb->num_reqs == 1) {
@@ -393,7 +393,7 @@ void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
         return;
     }
 
-    max_xfer_len = blk_get_max_transfer_length(mrb->reqs[0]->dev->blk);
+    max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
 
     qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
           &multireq_compare);
@@ -409,8 +409,9 @@ void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
              */
             if (sector_num + nb_sectors != req->sector_num ||
                 niov > blk_get_max_iov(blk) - req->qiov.niov ||
-                req->qiov.size / BDRV_SECTOR_SIZE > max_xfer_len ||
-                nb_sectors > max_xfer_len - req->qiov.size / BDRV_SECTOR_SIZE) {
+                req->qiov.size > max_transfer ||
+                nb_sectors > (max_transfer -
+                              req->qiov.size) / BDRV_SECTOR_SIZE) {
                 submit_requests(blk, mrb, start, num_reqs, niov);
                 num_reqs = 0;
             }
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 0cb8568..7a588a7 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -225,14 +225,14 @@ static void scsi_read_complete(void * opaque, int ret)
     if (s->type == TYPE_DISK &&
         r->req.cmd.buf[0] == INQUIRY &&
         r->req.cmd.buf[2] == 0xb0) {
-        uint32_t max_xfer_len = blk_get_max_transfer_length(s->conf.blk) /
-            (s->blocksize / BDRV_SECTOR_SIZE);
+        uint32_t max_transfer =
+            blk_get_max_transfer(s->conf.blk) / s->blocksize;
 
-        assert(max_xfer_len);
-        stl_be_p(&r->buf[8], max_xfer_len);
+        assert(max_transfer);
+        stl_be_p(&r->buf[8], max_transfer);
         /* Also take care of the opt xfer len. */
-        if (ldl_be_p(&r->buf[12]) > max_xfer_len) {
-            stl_be_p(&r->buf[12], max_xfer_len);
+        if (ldl_be_p(&r->buf[12]) > max_transfer) {
+            stl_be_p(&r->buf[12], max_transfer);
         }
     }
     scsi_req_data(&r->req, len);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 2057156..7d2b152 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -338,11 +338,14 @@ typedef struct BlockLimits {
      * power of 2, and less than max_pwrite_zeroes if that is set */
     uint32_t pwrite_zeroes_alignment;
 
-    /* optimal transfer length in sectors */
-    int opt_transfer_length;
-
-    /* maximal transfer length in sectors */
-    int max_transfer_length;
+    /* optimal transfer length in bytes (must be power of 2, and
+     * multiple of bs->request_alignment), or 0 if no preferred size */
+    uint32_t opt_transfer;
+
+    /* maximal transfer length in bytes (need not be power of 2, but
+     * should be multiple of opt_transfer), or 0 for no 32-bit limit.
+     * For now, anything larger than INT_MAX is clamped down. */
+    uint32_t max_transfer;
 
     /* memory alignment so that no bounce buffer is needed */
     size_t min_mem_alignment;
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index c04af8e..2469a1c 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -170,7 +170,7 @@ bool blk_is_available(BlockBackend *blk);
 void blk_lock_medium(BlockBackend *blk, bool locked);
 void blk_eject(BlockBackend *blk, bool eject_flag);
 int blk_get_flags(BlockBackend *blk);
-int blk_get_max_transfer_length(BlockBackend *blk);
+uint32_t blk_get_max_transfer(BlockBackend *blk);
 int blk_get_max_iov(BlockBackend *blk);
 void blk_set_guest_block_size(BlockBackend *blk, int align);
 void *blk_try_blockalign(BlockBackend *blk, size_t size);
diff --git a/qemu-img.c b/qemu-img.c
index 2351686..046b267 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2085,13 +2085,13 @@ static int img_convert(int argc, char **argv)
     }
     out_bs = blk_bs(out_blk);
 
-    /* increase bufsectors from the default 4096 (2M) if opt_transfer_length
+    /* increase bufsectors from the default 4096 (2M) if opt_transfer
      * or discard_alignment of the out_bs is greater. Limit to 32768 (16MB)
      * as maximum. */
     bufsectors = MIN(32768,
-                     MAX(bufsectors, MAX(out_bs->bl.opt_transfer_length,
-                                         out_bs->bl.discard_alignment))
-                    );
+                     MAX(bufsectors,
+                         MAX(out_bs->bl.opt_transfer >> BDRV_SECTOR_BITS,
+                             out_bs->bl.discard_alignment)));
 
     if (skip_create) {
         int64_t output_sectors = blk_nb_sectors(out_blk);
-- 
1.8.3.1

[Qemu-devel] [PULL 17/43] block: Wording tweaks to write zeroes limits

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

Improve the documentation of the write zeroes limits, to mention
additional constraints that drivers should observe.  Worth squashing
into commit cf081fca, if that hadn't been pushed already :)

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 include/block/block_int.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 7d2b152..7a4a00f 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -331,11 +331,14 @@ typedef struct BlockLimits {
     int64_t discard_alignment;
 
     /* maximum number of bytes that can zeroized at once (since it is
-     * signed, it must be < 2G, if set) */
+     * signed, it must be < 2G, if set), should be multiple of
+     * pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */
     int32_t max_pwrite_zeroes;
 
     /* optimal alignment for write zeroes requests in bytes, must be
-     * power of 2, and less than max_pwrite_zeroes if that is set */
+     * power of 2, less than max_pwrite_zeroes if that is set, and
+     * multiple of bs->request_alignment. May be 0 if
+     * bs->request_alignment is good enough */
     uint32_t pwrite_zeroes_alignment;
 
     /* optimal transfer length in bytes (must be power of 2, and
-- 
1.8.3.1

[Qemu-devel] [PULL 18/43] block: Switch discard length bounds to byte-based

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

Sector-based limits are awkward to think about; in our on-going
quest to move to byte-based interfaces, convert max_discard and
discard_alignment.  Rename them, using 'pdiscard' as an aid to
track which remaining discard interfaces need conversion, and so
that the compiler will help us catch the change in semantics
across any rebased code.  The BlockLimits type is now completely
byte-based; and in iscsi.c, sector_limits_lun2qemu() is no
longer needed.

pdiscard_alignment is made unsigned (we use power-of-2 alignments
as bitmasks, where unsigned is easier to think about) while
leaving max_pdiscard signed (since we still have an 'int'
interface); this is comparable to what commit cf081fc did for
write zeroes limits.  We may later want to make everything an
unsigned 64-bit limit - but that requires a bigger code audit.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c                | 16 +++++++++-------
 block/iscsi.c             | 19 ++++++-------------
 block/nbd.c               |  2 +-
 include/block/block_int.h | 16 +++++++++++-----
 qemu-img.c                |  3 ++-
 5 files changed, 29 insertions(+), 27 deletions(-)

diff --git a/block/io.c b/block/io.c
index 8ca9d43..0f15d05 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2368,19 +2368,21 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
         goto out;
     }
 
-    max_discard = MIN_NON_ZERO(bs->bl.max_discard, BDRV_REQUEST_MAX_SECTORS);
+    max_discard = MIN_NON_ZERO(bs->bl.max_pdiscard >> BDRV_SECTOR_BITS,
+                               BDRV_REQUEST_MAX_SECTORS);
     while (nb_sectors > 0) {
         int ret;
         int num = nb_sectors;
+        int discard_alignment = bs->bl.pdiscard_alignment >> BDRV_SECTOR_BITS;
 
         /* align request */
-        if (bs->bl.discard_alignment &&
-            num >= bs->bl.discard_alignment &&
-            sector_num % bs->bl.discard_alignment) {
-            if (num > bs->bl.discard_alignment) {
-                num = bs->bl.discard_alignment;
+        if (discard_alignment &&
+            num >= discard_alignment &&
+            sector_num % discard_alignment) {
+            if (num > discard_alignment) {
+                num = discard_alignment;
             }
-            num -= sector_num % bs->bl.discard_alignment;
+            num -= sector_num % discard_alignment;
         }
 
         /* limit request size */
diff --git a/block/iscsi.c b/block/iscsi.c
index bde4a04..342f6b8 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1697,13 +1697,6 @@ static void iscsi_close(BlockDriverState *bs)
     memset(iscsilun, 0, sizeof(IscsiLun));
 }
 
-static int sector_limits_lun2qemu(int64_t sector, IscsiLun *iscsilun)
-{
-    int limit = MIN(sector_lun2qemu(sector, iscsilun), INT_MAX / 2 + 1);
-
-    return limit < BDRV_REQUEST_MAX_SECTORS ? limit : 0;
-}
-
 static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     /* We don't actually refresh here, but just return data queried in
@@ -1723,14 +1716,14 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
     }
 
     if (iscsilun->lbp.lbpu) {
-        if (iscsilun->bl.max_unmap < 0xffffffff) {
-            bs->bl.max_discard =
-                sector_limits_lun2qemu(iscsilun->bl.max_unmap, iscsilun);
+        if (iscsilun->bl.max_unmap < 0xffffffff / iscsilun->block_size) {
+            bs->bl.max_pdiscard =
+                iscsilun->bl.max_unmap * iscsilun->block_size;
         }
-        bs->bl.discard_alignment =
-            sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun);
+        bs->bl.pdiscard_alignment =
+            iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
     } else {
-        bs->bl.discard_alignment = iscsilun->block_size >> BDRV_SECTOR_BITS;
+        bs->bl.pdiscard_alignment = iscsilun->block_size;
     }
 
     if (iscsilun->bl.max_ws_len < 0xffffffff / iscsilun->block_size) {
diff --git a/block/nbd.c b/block/nbd.c
index f5511ea..08e5b67 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -362,7 +362,7 @@ static int nbd_co_flush(BlockDriverState *bs)
 
 static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->bl.max_discard = NBD_MAX_SECTORS;
+    bs->bl.max_pdiscard = NBD_MAX_BUFFER_SIZE;
     bs->bl.max_transfer = NBD_MAX_BUFFER_SIZE;
 }
 
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 7a4a00f..a3e69fd 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -324,11 +324,17 @@ struct BlockDriver {
 };
 
 typedef struct BlockLimits {
-    /* maximum number of sectors that can be discarded at once */
-    int max_discard;
-
-    /* optimal alignment for discard requests in sectors */
-    int64_t discard_alignment;
+    /* maximum number of bytes that can be discarded at once (since it
+     * is signed, it must be < 2G, if set), should be multiple of
+     * pdiscard_alignment, but need not be power of 2. May be 0 if no
+     * inherent 32-bit limit */
+    int32_t max_pdiscard;
+
+    /* optimal alignment for discard requests in bytes, must be power
+     * of 2, less than max_pdiscard if that is set, and multiple of
+     * bs->request_alignment. May be 0 if bs->request_alignment is
+     * good enough */
+    uint32_t pdiscard_alignment;
 
     /* maximum number of bytes that can zeroized at once (since it is
      * signed, it must be < 2G, if set), should be multiple of
diff --git a/qemu-img.c b/qemu-img.c
index 046b267..3a7c162 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2091,7 +2091,8 @@ static int img_convert(int argc, char **argv)
     bufsectors = MIN(32768,
                      MAX(bufsectors,
                          MAX(out_bs->bl.opt_transfer >> BDRV_SECTOR_BITS,
-                             out_bs->bl.discard_alignment)));
+                             out_bs->bl.pdiscard_alignment >>
+                             BDRV_SECTOR_BITS)));
 
     if (skip_create) {
         int64_t output_sectors = blk_nb_sectors(out_blk);
-- 
1.8.3.1

[Qemu-devel] [PULL 19/43] block: Drop raw_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

The raw block driver was blindly copying all limits from bs->file,
even though: 1. the main bdrv_refresh_limits() already does this
for many of the limits, and 2. blindly copying from the children
can weaken any stricter limits that were already inherited from
the backing chain during the main bdrv_refresh_limits().  Also,
a future patch is about to move .request_alignment into
BlockLimits, and that is a limit that should NOT be copied from
other layers in the BDS chain.

Thus, we can completely drop raw_refresh_limits(), and rely on
the block layer setting up the proper limits.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/raw_bsd.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index 7f63791..5855e84 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -1,6 +1,6 @@
 /* BlockDriver implementation for "raw"
  *
- * Copyright (C) 2010, 2013, Red Hat, Inc.
+ * Copyright (C) 2010-2016 Red Hat, Inc.
  * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com>
  * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com>
  *
@@ -150,11 +150,6 @@ static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
     return bdrv_get_info(bs->file->bs, bdi);
 }
 
-static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
-{
-    bs->bl = bs->file->bs->bl;
-}
-
 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 {
     return bdrv_truncate(bs->file->bs, offset);
@@ -252,7 +247,6 @@ BlockDriver bdrv_raw = {
     .bdrv_getlength       = &raw_getlength,
     .has_variable_length  = true,
     .bdrv_get_info        = &raw_get_info,
-    .bdrv_refresh_limits  = &raw_refresh_limits,
     .bdrv_probe_blocksizes = &raw_probe_blocksizes,
     .bdrv_probe_geometry  = &raw_probe_geometry,
     .bdrv_media_changed   = &raw_media_changed,
-- 
1.8.3.1

[Qemu-devel] [PULL 20/43] block: Split bdrv_merge_limits() from bdrv_refresh_limits()

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

During bdrv_merge_limits(), we were computing initial limits
based on another BDS in two places.  At first glance, the two
computations are not identical (one is doing straight copying,
the other is doing merging towards or away from zero) - but
when you realize that the first round is starting with all-0
memory, all of the merging happens to work.  Factoring out the
merging makes it easier to track how two BDS limits are merged,
in case we have future reasons to merge in even more limits.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/block/io.c b/block/io.c
index 0f15d05..69dbbd3 100644
--- a/block/io.c
+++ b/block/io.c
@@ -67,6 +67,17 @@ static void bdrv_parent_drained_end(BlockDriverState *bs)
     }
 }
 
+static void bdrv_merge_limits(BlockLimits *dst, const BlockLimits *src)
+{
+    dst->opt_transfer = MAX(dst->opt_transfer, src->opt_transfer);
+    dst->max_transfer = MIN_NON_ZERO(dst->max_transfer, src->max_transfer);
+    dst->opt_mem_alignment = MAX(dst->opt_mem_alignment,
+                                 src->opt_mem_alignment);
+    dst->min_mem_alignment = MAX(dst->min_mem_alignment,
+                                 src->min_mem_alignment);
+    dst->max_iov = MIN_NON_ZERO(dst->max_iov, src->max_iov);
+}
+
 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     BlockDriver *drv = bs->drv;
@@ -88,11 +99,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
             error_propagate(errp, local_err);
             return;
         }
-        bs->bl.opt_transfer = bs->file->bs->bl.opt_transfer;
-        bs->bl.max_transfer = bs->file->bs->bl.max_transfer;
-        bs->bl.min_mem_alignment = bs->file->bs->bl.min_mem_alignment;
-        bs->bl.opt_mem_alignment = bs->file->bs->bl.opt_mem_alignment;
-        bs->bl.max_iov = bs->file->bs->bl.max_iov;
+        bdrv_merge_limits(&bs->bl, &bs->file->bs->bl);
     } else {
         bs->bl.min_mem_alignment = 512;
         bs->bl.opt_mem_alignment = getpagesize();
@@ -107,19 +114,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
             error_propagate(errp, local_err);
             return;
         }
-        bs->bl.opt_transfer = MAX(bs->bl.opt_transfer,
-                                  bs->backing->bs->bl.opt_transfer);
-        bs->bl.max_transfer = MIN_NON_ZERO(bs->bl.max_transfer,
-                                           bs->backing->bs->bl.max_transfer);
-        bs->bl.opt_mem_alignment =
-            MAX(bs->bl.opt_mem_alignment,
-                bs->backing->bs->bl.opt_mem_alignment);
-        bs->bl.min_mem_alignment =
-            MAX(bs->bl.min_mem_alignment,
-                bs->backing->bs->bl.min_mem_alignment);
-        bs->bl.max_iov =
-            MIN(bs->bl.max_iov,
-                bs->backing->bs->bl.max_iov);
+        bdrv_merge_limits(&bs->bl, &bs->backing->bs->bl);
     }
 
     /* Then let the driver override it */
-- 
1.8.3.1

[Qemu-devel] [PULL 21/43] block: Move request_alignment into BlockLimit

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

It makes more sense to have ALL block size limit constraints
in the same struct.  Improve the documentation while at it.

Simplify a couple of conditionals, now that we have audited and
documented that request_alignment is always non-zero.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c                   |  2 +-
 block/blkdebug.c          |  2 +-
 block/bochs.c             |  2 +-
 block/cloop.c             |  2 +-
 block/dmg.c               |  2 +-
 block/io.c                | 14 +++++++-------
 block/iscsi.c             |  2 +-
 block/qcow2.c             |  2 +-
 block/raw-posix.c         | 16 ++++++++--------
 block/raw-win32.c         |  6 +++---
 block/vvfat.c             |  2 +-
 include/block/block_int.h | 22 +++++++++++++---------
 12 files changed, 39 insertions(+), 35 deletions(-)

diff --git a/block.c b/block.c
index c2fbf06..34894ad 100644
--- a/block.c
+++ b/block.c
@@ -1016,7 +1016,7 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
 
     assert(bdrv_opt_mem_align(bs) != 0);
     assert(bdrv_min_mem_align(bs) != 0);
-    assert(is_power_of_2(bs->request_alignment) || bdrv_is_sg(bs));
+    assert(is_power_of_2(bs->bl.request_alignment));
 
     qemu_opts_del(opts);
     return 0;
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 54b6870..b6ecee3 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -726,7 +726,7 @@ static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp)
     BDRVBlkdebugState *s = bs->opaque;
 
     if (s->align) {
-        bs->request_alignment = s->align;
+        bs->bl.request_alignment = s->align;
     }
 }
 
diff --git a/block/bochs.c b/block/bochs.c
index 182c50b..4194f1d 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -190,7 +190,7 @@ fail:
 
 static void bochs_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+    bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
 }
 
 static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
diff --git a/block/cloop.c b/block/cloop.c
index d574003..b5dc286 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -200,7 +200,7 @@ fail:
 
 static void cloop_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+    bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
 }
 
 static inline int cloop_read_block(BlockDriverState *bs, int block_num)
diff --git a/block/dmg.c b/block/dmg.c
index 1e53cd8..9612c21 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -548,7 +548,7 @@ fail:
 
 static void dmg_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+    bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
 }
 
 static inline int is_sector_in_chunk(BDRVDMGState* s,
diff --git a/block/io.c b/block/io.c
index 69dbbd3..b9e53e3 100644
--- a/block/io.c
+++ b/block/io.c
@@ -90,7 +90,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp)
     }
 
     /* Default alignment based on whether driver has byte interface */
-    bs->request_alignment = drv->bdrv_co_preadv ? 1 : 512;
+    bs->bl.request_alignment = drv->bdrv_co_preadv ? 1 : 512;
 
     /* Take some limits from the children as a default */
     if (bs->file) {
@@ -459,7 +459,7 @@ static int bdrv_get_cluster_size(BlockDriverState *bs)
 
     ret = bdrv_get_info(bs, &bdi);
     if (ret < 0 || bdi.cluster_size == 0) {
-        return bs->request_alignment;
+        return bs->bl.request_alignment;
     } else {
         return bdi.cluster_size;
     }
@@ -1068,7 +1068,7 @@ int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
     BlockDriver *drv = bs->drv;
     BdrvTrackedRequest req;
 
-    uint64_t align = bs->request_alignment;
+    uint64_t align = bs->bl.request_alignment;
     uint8_t *head_buf = NULL;
     uint8_t *tail_buf = NULL;
     QEMUIOVector local_qiov;
@@ -1164,8 +1164,8 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
     int tail = 0;
 
     int max_write_zeroes = MIN_NON_ZERO(bs->bl.max_pwrite_zeroes, INT_MAX);
-    int alignment = MAX(bs->bl.pwrite_zeroes_alignment ?: 1,
-                        bs->request_alignment);
+    int alignment = MAX(bs->bl.pwrite_zeroes_alignment,
+                        bs->bl.request_alignment);
 
     assert(is_power_of_2(alignment));
     head = offset & (alignment - 1);
@@ -1324,7 +1324,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BlockDriverState *bs,
     uint8_t *buf = NULL;
     QEMUIOVector local_qiov;
     struct iovec iov;
-    uint64_t align = bs->request_alignment;
+    uint64_t align = bs->bl.request_alignment;
     unsigned int head_padding_bytes, tail_padding_bytes;
     int ret = 0;
 
@@ -1411,7 +1411,7 @@ int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
     BdrvRequestFlags flags)
 {
     BdrvTrackedRequest req;
-    uint64_t align = bs->request_alignment;
+    uint64_t align = bs->bl.request_alignment;
     uint8_t *head_buf = NULL;
     uint8_t *tail_buf = NULL;
     QEMUIOVector local_qiov;
diff --git a/block/iscsi.c b/block/iscsi.c
index 342f6b8..b73fd0a 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1705,7 +1705,7 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
     IscsiLun *iscsilun = bs->opaque;
     uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
 
-    bs->request_alignment = iscsilun->block_size;
+    bs->bl.request_alignment = iscsilun->block_size;
 
     if (iscsilun->bl.max_xfer_len) {
         max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
diff --git a/block/qcow2.c b/block/qcow2.c
index 48f80b6..fdf13cb 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1201,7 +1201,7 @@ static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp)
 
     if (bs->encrypted) {
         /* Encryption works on a sector granularity */
-        bs->request_alignment = BDRV_SECTOR_SIZE;
+        bs->bl.request_alignment = BDRV_SECTOR_SIZE;
     }
     bs->bl.pwrite_zeroes_alignment = s->cluster_size;
 }
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 8da2f94..d3d7cce 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -302,22 +302,22 @@ static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
     /* For SCSI generic devices the alignment is not really used.
        With buffered I/O, we don't have any restrictions. */
     if (bdrv_is_sg(bs) || !s->needs_alignment) {
-        bs->request_alignment = 1;
+        bs->bl.request_alignment = 1;
         s->buf_align = 1;
         return;
     }
 
-    bs->request_alignment = 0;
+    bs->bl.request_alignment = 0;
     s->buf_align = 0;
     /* Let's try to use the logical blocksize for the alignment. */
-    if (probe_logical_blocksize(fd, &bs->request_alignment) < 0) {
-        bs->request_alignment = 0;
+    if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) {
+        bs->bl.request_alignment = 0;
     }
 #ifdef CONFIG_XFS
     if (s->is_xfs) {
         struct dioattr da;
         if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
-            bs->request_alignment = da.d_miniosz;
+            bs->bl.request_alignment = da.d_miniosz;
             /* The kernel returns wrong information for d_mem */
             /* s->buf_align = da.d_mem; */
         }
@@ -337,19 +337,19 @@ static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
         qemu_vfree(buf);
     }
 
-    if (!bs->request_alignment) {
+    if (!bs->bl.request_alignment) {
         size_t align;
         buf = qemu_memalign(s->buf_align, max_align);
         for (align = 512; align <= max_align; align <<= 1) {
             if (raw_is_io_aligned(fd, buf, align)) {
-                bs->request_alignment = align;
+                bs->bl.request_alignment = align;
                 break;
             }
         }
         qemu_vfree(buf);
     }
 
-    if (!s->buf_align || !bs->request_alignment) {
+    if (!s->buf_align || !bs->bl.request_alignment) {
         error_setg(errp, "Could not find working O_DIRECT alignment. "
                          "Try cache.direct=off.");
     }
diff --git a/block/raw-win32.c b/block/raw-win32.c
index 88382d9..62edb1a 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -230,14 +230,14 @@ static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
     BOOL status;
 
     if (s->type == FTYPE_CD) {
-        bs->request_alignment = 2048;
+        bs->bl.request_alignment = 2048;
         return;
     }
     if (s->type == FTYPE_HARDDISK) {
         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
         if (status != 0) {
-            bs->request_alignment = dg.Geometry.BytesPerSector;
+            bs->bl.request_alignment = dg.Geometry.BytesPerSector;
             return;
         }
         /* try GetDiskFreeSpace too */
@@ -247,7 +247,7 @@ static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
         GetDiskFreeSpace(s->drive_path, &sectorsPerCluster,
                          &dg.Geometry.BytesPerSector,
                          &freeClusters, &totalClusters);
-        bs->request_alignment = dg.Geometry.BytesPerSector;
+        bs->bl.request_alignment = dg.Geometry.BytesPerSector;
     }
 }
 
diff --git a/block/vvfat.c b/block/vvfat.c
index 4d44636..fc948cb 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1210,7 +1210,7 @@ fail:
 
 static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+    bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
 }
 
 static inline void vvfat_close_current_file(BDRVVVFATState *s)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index a3e69fd..8f061eb 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -324,6 +324,12 @@ struct BlockDriver {
 };
 
 typedef struct BlockLimits {
+    /* Alignment requirement, in bytes, for offset/length of I/O
+     * requests. Must be a power of 2 less than INT_MAX; defaults to
+     * 1 for drivers with modern byte interfaces, and to 512
+     * otherwise. */
+    uint32_t request_alignment;
+
     /* maximum number of bytes that can be discarded at once (since it
      * is signed, it must be < 2G, if set), should be multiple of
      * pdiscard_alignment, but need not be power of 2. May be 0 if no
@@ -332,8 +338,8 @@ typedef struct BlockLimits {
 
     /* optimal alignment for discard requests in bytes, must be power
      * of 2, less than max_pdiscard if that is set, and multiple of
-     * bs->request_alignment. May be 0 if bs->request_alignment is
-     * good enough */
+     * bl.request_alignment. May be 0 if bl.request_alignment is good
+     * enough */
     uint32_t pdiscard_alignment;
 
     /* maximum number of bytes that can zeroized at once (since it is
@@ -343,12 +349,12 @@ typedef struct BlockLimits {
 
     /* optimal alignment for write zeroes requests in bytes, must be
      * power of 2, less than max_pwrite_zeroes if that is set, and
-     * multiple of bs->request_alignment. May be 0 if
-     * bs->request_alignment is good enough */
+     * multiple of bl.request_alignment. May be 0 if
+     * bl.request_alignment is good enough */
     uint32_t pwrite_zeroes_alignment;
 
     /* optimal transfer length in bytes (must be power of 2, and
-     * multiple of bs->request_alignment), or 0 if no preferred size */
+     * multiple of bl.request_alignment), or 0 if no preferred size */
     uint32_t opt_transfer;
 
     /* maximal transfer length in bytes (need not be power of 2, but
@@ -356,10 +362,10 @@ typedef struct BlockLimits {
      * For now, anything larger than INT_MAX is clamped down. */
     uint32_t max_transfer;
 
-    /* memory alignment so that no bounce buffer is needed */
+    /* memory alignment, in bytes so that no bounce buffer is needed */
     size_t min_mem_alignment;
 
-    /* memory alignment for bounce buffer */
+    /* memory alignment, in bytes, for bounce buffer */
     size_t opt_mem_alignment;
 
     /* maximum number of iovec elements */
@@ -465,8 +471,6 @@ struct BlockDriverState {
     /* I/O Limits */
     BlockLimits bl;
 
-    /* Alignment requirement for offset/length of I/O requests */
-    unsigned int request_alignment;
     /* Flags honored during pwrite (so far: BDRV_REQ_FUA) */
     unsigned int supported_write_flags;
     /* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
-- 
1.8.3.1

[Qemu-devel] [PULL 22/43] block: Fix error message style

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

error_setg() is not supposed to be used for multi-sentence
messages; tweak the message to append a hint instead.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/raw-posix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/raw-posix.c b/block/raw-posix.c
index d3d7cce..c979ac3 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -350,8 +350,8 @@ static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
     }
 
     if (!s->buf_align || !bs->bl.request_alignment) {
-        error_setg(errp, "Could not find working O_DIRECT alignment. "
-                         "Try cache.direct=off.");
+        error_setg(errp, "Could not find working O_DIRECT alignment");
+        error_append_hint(errp, "Try cache.direct=off\n");
     }
 }
 
-- 
1.8.3.1

[Qemu-devel] [PULL 23/43] block: Use bool as appropriate for BDS members

[Kevin Wolf]

From: Eric Blake <eblake@redhat.com>

Using int for values that are only used as booleans is confusing.
While at it, rearrange a couple of members so that all the bools
are contiguous.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c                   | 22 +++++++++++-----------
 block/bochs.c             |  2 +-
 block/cloop.c             |  2 +-
 block/crypto.c            |  4 ++--
 block/dmg.c               |  2 +-
 block/iscsi.c             |  2 +-
 block/qcow.c              |  2 +-
 block/qcow2.c             |  2 +-
 block/vvfat.c             |  4 ++--
 include/block/block.h     |  8 ++++----
 include/block/block_int.h | 13 +++++++------
 11 files changed, 32 insertions(+), 31 deletions(-)

diff --git a/block.c b/block.c
index 34894ad..947df29 100644
--- a/block.c
+++ b/block.c
@@ -2183,9 +2183,9 @@ static void bdrv_close(BlockDriverState *bs)
         bs->backing_file[0] = '\0';
         bs->backing_format[0] = '\0';
         bs->total_sectors = 0;
-        bs->encrypted = 0;
-        bs->valid_key = 0;
-        bs->sg = 0;
+        bs->encrypted = false;
+        bs->valid_key = false;
+        bs->sg = false;
         QDECREF(bs->options);
         QDECREF(bs->explicit_options);
         bs->options = NULL;
@@ -2643,30 +2643,30 @@ void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
     *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors;
 }
 
-int bdrv_is_read_only(BlockDriverState *bs)
+bool bdrv_is_read_only(BlockDriverState *bs)
 {
     return bs->read_only;
 }
 
-int bdrv_is_sg(BlockDriverState *bs)
+bool bdrv_is_sg(BlockDriverState *bs)
 {
     return bs->sg;
 }
 
-int bdrv_is_encrypted(BlockDriverState *bs)
+bool bdrv_is_encrypted(BlockDriverState *bs)
 {
     if (bs->backing && bs->backing->bs->encrypted) {
-        return 1;
+        return true;
     }
     return bs->encrypted;
 }
 
-int bdrv_key_required(BlockDriverState *bs)
+bool bdrv_key_required(BlockDriverState *bs)
 {
     BdrvChild *backing = bs->backing;
 
     if (backing && backing->bs->encrypted && !backing->bs->valid_key) {
-        return 1;
+        return true;
     }
     return (bs->encrypted && !bs->valid_key);
 }
@@ -2688,10 +2688,10 @@ int bdrv_set_key(BlockDriverState *bs, const char *key)
     }
     ret = bs->drv->bdrv_set_key(bs, key);
     if (ret < 0) {
-        bs->valid_key = 0;
+        bs->valid_key = false;
     } else if (!bs->valid_key) {
         /* call the change callback now, we skipped it on open */
-        bs->valid_key = 1;
+        bs->valid_key = true;
         bdrv_parent_cb_change_media(bs, true);
     }
     return ret;
diff --git a/block/bochs.c b/block/bochs.c
index 4194f1d..6427ad4 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -104,7 +104,7 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
     struct bochs_header bochs;
     int ret;
 
-    bs->read_only = 1; // no write support yet
+    bs->read_only = true; /* no write support yet */
 
     ret = bdrv_pread(bs->file->bs, 0, &bochs, sizeof(bochs));
     if (ret < 0) {
diff --git a/block/cloop.c b/block/cloop.c
index b5dc286..8f046e1 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -66,7 +66,7 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
     uint32_t offsets_size, max_compressed_block_size = 1, i;
     int ret;
 
-    bs->read_only = 1;
+    bs->read_only = true;
 
     /* read header */
     ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4);
diff --git a/block/crypto.c b/block/crypto.c
index 758e14e..ec1f247 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -322,8 +322,8 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
         goto cleanup;
     }
 
-    bs->encrypted = 1;
-    bs->valid_key = 1;
+    bs->encrypted = true;
+    bs->valid_key = true;
 
     ret = 0;
  cleanup:
diff --git a/block/dmg.c b/block/dmg.c
index 9612c21..11a0673 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -438,7 +438,7 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
     int64_t offset;
     int ret;
 
-    bs->read_only = 1;
+    bs->read_only = true;
 
     s->n_chunks = 0;
     s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
diff --git a/block/iscsi.c b/block/iscsi.c
index b73fd0a..24f78a7 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1597,7 +1597,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
      * will try to read from the device to guess the image format.
      */
     if (iscsilun->type != TYPE_DISK && iscsilun->type != TYPE_ROM) {
-        bs->sg = 1;
+        bs->sg = true;
     }
 
     task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
diff --git a/block/qcow.c b/block/qcow.c
index 312af52..e4175b8 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -174,7 +174,7 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
             goto fail;
         }
 
-        bs->encrypted = 1;
+        bs->encrypted = true;
     }
     s->cluster_bits = header.cluster_bits;
     s->cluster_size = 1 << s->cluster_bits;
diff --git a/block/qcow2.c b/block/qcow2.c
index fdf13cb..0178931 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -980,7 +980,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
             goto fail;
         }
 
-        bs->encrypted = 1;
+        bs->encrypted = true;
     }
 
     s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */
diff --git a/block/vvfat.c b/block/vvfat.c
index fc948cb..55b5759 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1158,7 +1158,7 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
     s->current_cluster=0xffffffff;
 
     /* read only is the default for safety */
-    bs->read_only = 1;
+    bs->read_only = true;
     s->qcow = s->write_target = NULL;
     s->qcow_filename = NULL;
     s->fat2 = NULL;
@@ -1174,7 +1174,7 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
         if (ret < 0) {
             goto fail;
         }
-        bs->read_only = 0;
+        bs->read_only = false;
     }
 
     bs->total_sectors = cyls * heads * secs;
diff --git a/include/block/block.h b/include/block/block.h
index 733a8ec..211a0f2 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -362,8 +362,8 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
                             int64_t sector_num, int nb_sectors, int *pnum);
 
-int bdrv_is_read_only(BlockDriverState *bs);
-int bdrv_is_sg(BlockDriverState *bs);
+bool bdrv_is_read_only(BlockDriverState *bs);
+bool bdrv_is_sg(BlockDriverState *bs);
 bool bdrv_is_inserted(BlockDriverState *bs);
 int bdrv_media_changed(BlockDriverState *bs);
 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
@@ -390,8 +390,8 @@ BlockDriverState *bdrv_first(BdrvNextIterator *it);
 BlockDriverState *bdrv_next(BdrvNextIterator *it);
 
 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs);
-int bdrv_is_encrypted(BlockDriverState *bs);
-int bdrv_key_required(BlockDriverState *bs);
+bool bdrv_is_encrypted(BlockDriverState *bs);
+bool bdrv_key_required(BlockDriverState *bs);
 int bdrv_set_key(BlockDriverState *bs, const char *key);
 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp);
 int bdrv_query_missing_keys(void);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 8f061eb..0432ba5 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -429,14 +429,15 @@ struct BdrvChild {
 struct BlockDriverState {
     int64_t total_sectors; /* if we are reading a disk image, give its
                               size in sectors */
-    int read_only; /* if true, the media is read only */
     int open_flags; /* flags used to open the file, re-used for re-open */
-    int encrypted; /* if true, the media is encrypted */
-    int valid_key; /* if true, a valid encryption key has been set */
-    int sg;        /* if true, the device is a /dev/sg* */
-    int copy_on_read; /* if true, copy read backing sectors into image
+    bool read_only; /* if true, the media is read only */
+    bool encrypted; /* if true, the media is encrypted */
+    bool valid_key; /* if true, a valid encryption key has been set */
+    bool sg;        /* if true, the device is a /dev/sg* */
+    bool probed;    /* if true, format was probed rather than specified */
+
+    int copy_on_read; /* if nonzero, copy read backing sectors into image.
                          note this is a reference count */
-    bool probed;
 
     BlockDriver *drv; /* NULL means no media */
     void *opaque;
-- 
1.8.3.1

[Qemu-devel] [PULL 24/43] block: fix return code for partial write for Linux AIO

[Kevin Wolf]

From: "Denis V. Lunev" <den@openvz.org>

Partial write most likely means that there is not space rather than
"something wrong happens". Thus it would be more natural to return
ENOSPC rather than EINVAL.

The problem actually happens with NBD server, which has reported EINVAL
rather then ENOSPC on the first error using its protocol, which makes
report to the user wrong.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Pavel Borzenkov <pborzenkov@virtuozzo.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/linux-aio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/linux-aio.c b/block/linux-aio.c
index e468960..7df8651 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -87,7 +87,7 @@ static void qemu_laio_process_completion(struct qemu_laiocb *laiocb)
                 qemu_iovec_memset(laiocb->qiov, ret, 0,
                     laiocb->qiov->size - ret);
             } else {
-                ret = -EINVAL;
+                ret = -ENOSPC;
             }
         }
     }
-- 
1.8.3.1

[Qemu-devel] [PULL 25/43] block/qdev: Fix NULL access when using BB twice

[Kevin Wolf]

BlockBackend has only a single pointer to its guest device, so it makes
sure that only a single guest device is attached to it. device-add
returns an error if you try to attach a second device to a BB. In order
to make the error message nicer, -device that manually connects to a
if=none block device get a different message than -drive that implicitly
creates a guest device. The if=... option is stored in DriveInfo.

However, since blockdev-add exists, not every BlockBackend has a
DriveInfo any more. Check that it exists before we dereference it.

QMP reproducer resulting in a segfault:

{"execute":"blockdev-add","arguments":{"options":{"id":"disk","driver":"file","filename":"/tmp/test.img"}}}
{"execute":"device_add","arguments":{"driver":"virtio-blk-pci","drive":"disk"}}
{"execute":"device_add","arguments":{"driver":"virtio-blk-pci","drive":"disk"}}

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 hw/core/qdev-properties-system.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index 891219a..df38b8a 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -82,7 +82,7 @@ static void parse_drive(DeviceState *dev, const char *str, void **ptr,
     if (blk_attach_dev(blk, dev) < 0) {
         DriveInfo *dinfo = blk_legacy_dinfo(blk);
 
-        if (dinfo->type != IF_NONE) {
+        if (dinfo && dinfo->type != IF_NONE) {
             error_setg(errp, "Drive '%s' is already in use because "
                        "it has been automatically connected to another "
                        "device (did you need 'if=none' in the drive options?)",
-- 
1.8.3.1

[Qemu-devel] [PULL 26/43] vvfat: Use BdrvChild for s->qcow

[Kevin Wolf]

vvfat uses a temporary qcow file to cache written data in read-write
mode. In order to do things properly, this should show up in the BDS
graph and I/O should go through BdrvChild like for every other node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/vvfat.c | 66 ++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 43 insertions(+), 23 deletions(-)

diff --git a/block/vvfat.c b/block/vvfat.c
index 55b5759..be9036e 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -341,9 +341,8 @@ typedef struct BDRVVVFATState {
     unsigned int current_cluster;
 
     /* write support */
-    BlockDriverState* write_target;
     char* qcow_filename;
-    BlockDriverState* qcow;
+    BdrvChild* qcow;
     void* fat2;
     char* used_clusters;
     array_t commits;
@@ -981,7 +980,7 @@ static int init_directories(BDRVVVFATState* s,
 static BDRVVVFATState *vvv = NULL;
 #endif
 
-static int enable_write_target(BDRVVVFATState *s, Error **errp);
+static int enable_write_target(BlockDriverState *bs, Error **errp);
 static int is_consistent(BDRVVVFATState *s);
 
 static QemuOptsList runtime_opts = {
@@ -1159,7 +1158,7 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
 
     /* read only is the default for safety */
     bs->read_only = true;
-    s->qcow = s->write_target = NULL;
+    s->qcow = NULL;
     s->qcow_filename = NULL;
     s->fat2 = NULL;
     s->downcase_short_names = 1;
@@ -1170,7 +1169,7 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
     s->sector_count = cyls * heads * secs - (s->first_sectors_number - 1);
 
     if (qemu_opt_get_bool(opts, "rw", false)) {
-        ret = enable_write_target(s, errp);
+        ret = enable_write_target(bs, errp);
         if (ret < 0) {
             goto fail;
         }
@@ -1391,9 +1390,10 @@ static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
 	   return -1;
 	if (s->qcow) {
 	    int n;
-            if (bdrv_is_allocated(s->qcow, sector_num, nb_sectors-i, &n)) {
-DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n));
-                if (bdrv_read(s->qcow, sector_num, buf + i*0x200, n)) {
+            if (bdrv_is_allocated(s->qcow->bs, sector_num, nb_sectors-i, &n)) {
+                DLOG(fprintf(stderr, "sectors %d+%d allocated\n",
+                             (int)sector_num, n));
+                if (bdrv_read(s->qcow->bs, sector_num, buf + i * 0x200, n)) {
                     return -1;
                 }
                 i += n - 1;
@@ -1669,12 +1669,15 @@ static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num)
     int was_modified = 0;
     int i, dummy;
 
-    if (s->qcow == NULL)
-	return 0;
+    if (s->qcow == NULL) {
+        return 0;
+    }
 
-    for (i = 0; !was_modified && i < s->sectors_per_cluster; i++)
-	was_modified = bdrv_is_allocated(s->qcow,
-		cluster2sector(s, cluster_num) + i, 1, &dummy);
+    for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) {
+        was_modified = bdrv_is_allocated(s->qcow->bs,
+                                         cluster2sector(s, cluster_num) + i,
+                                         1, &dummy);
+    }
 
     return was_modified;
 }
@@ -1823,11 +1826,17 @@ static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
 
 		vvfat_close_current_file(s);
                 for (i = 0; i < s->sectors_per_cluster; i++) {
-                    if (!bdrv_is_allocated(s->qcow, offset + i, 1, &dummy)) {
-                        if (vvfat_read(s->bs, offset, s->cluster_buffer, 1)) {
+                    int res;
+
+                    res = bdrv_is_allocated(s->qcow->bs, offset + i, 1, &dummy);
+                    if (!res) {
+                        res = vvfat_read(s->bs, offset, s->cluster_buffer, 1);
+                        if (res) {
                             return -1;
                         }
-                        if (bdrv_write(s->qcow, offset, s->cluster_buffer, 1)) {
+                        res = bdrv_write(s->qcow->bs, offset,
+                                         s->cluster_buffer, 1);
+                        if (res) {
                             return -2;
                         }
                     }
@@ -2783,8 +2792,8 @@ static int do_commit(BDRVVVFATState* s)
 	return ret;
     }
 
-    if (s->qcow->drv->bdrv_make_empty) {
-        s->qcow->drv->bdrv_make_empty(s->qcow);
+    if (s->qcow->bs->drv->bdrv_make_empty) {
+        s->qcow->bs->drv->bdrv_make_empty(s->qcow->bs);
     }
 
     memset(s->used_clusters, 0, sector2cluster(s, s->sector_count));
@@ -2880,7 +2889,7 @@ DLOG(checkpoint());
      * Use qcow backend. Commit later.
      */
 DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
-    ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors);
+    ret = bdrv_write(s->qcow->bs, sector_num, buf, nb_sectors);
     if (ret < 0) {
 	fprintf(stderr, "Error writing to qcow backend\n");
 	return ret;
@@ -2950,7 +2959,7 @@ write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
 
 static void write_target_close(BlockDriverState *bs) {
     BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
-    bdrv_unref(s->qcow);
+    bdrv_unref_child(s->bs, s->qcow);
     g_free(s->qcow_filename);
 }
 
@@ -2960,8 +2969,19 @@ static BlockDriver vvfat_write_target = {
     .bdrv_close         = write_target_close,
 };
 
-static int enable_write_target(BDRVVVFATState *s, Error **errp)
+static void vvfat_qcow_options(int *child_flags, QDict *child_options,
+                               int parent_flags, QDict *parent_options)
 {
+    *child_flags = BDRV_O_RDWR | BDRV_O_NO_FLUSH;
+}
+
+static const BdrvChildRole child_vvfat_qcow = {
+    .inherit_options    = vvfat_qcow_options,
+};
+
+static int enable_write_target(BlockDriverState *bs, Error **errp)
+{
+    BDRVVVFATState *s = bs->opaque;
     BlockDriver *bdrv_qcow = NULL;
     BlockDriverState *backing;
     QemuOpts *opts = NULL;
@@ -3000,8 +3020,8 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp)
 
     options = qdict_new();
     qdict_put(options, "driver", qstring_from_str("qcow"));
-    s->qcow = bdrv_open(s->qcow_filename, NULL, options,
-                        BDRV_O_RDWR | BDRV_O_NO_FLUSH, errp);
+    s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
+                              &child_vvfat_qcow, false, errp);
     if (!s->qcow) {
         ret = -EINVAL;
         goto err;
-- 
1.8.3.1

[Qemu-devel] [PULL 27/43] blkreplay: Convert to byte-based I/O

[Kevin Wolf]

The blkreplay driver only forwards the requests it gets, so converting
it to byte granularity is trivial.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/blkreplay.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/block/blkreplay.c b/block/blkreplay.c
index 525c2d5..196b8d0 100755
--- a/block/blkreplay.c
+++ b/block/blkreplay.c
@@ -81,22 +81,22 @@ static void block_request_create(uint64_t reqid, BlockDriverState *bs,
     replay_block_event(req->bh, reqid);
 }
 
-static int coroutine_fn blkreplay_co_readv(BlockDriverState *bs,
-    int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
+static int coroutine_fn blkreplay_co_preadv(BlockDriverState *bs,
+    uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
 {
     uint64_t reqid = request_id++;
-    int ret = bdrv_co_readv(bs->file->bs, sector_num, nb_sectors, qiov);
+    int ret = bdrv_co_preadv(bs->file->bs, offset, bytes, qiov, flags);
     block_request_create(reqid, bs, qemu_coroutine_self());
     qemu_coroutine_yield();
 
     return ret;
 }
 
-static int coroutine_fn blkreplay_co_writev(BlockDriverState *bs,
-    int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
+static int coroutine_fn blkreplay_co_pwritev(BlockDriverState *bs,
+    uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
 {
     uint64_t reqid = request_id++;
-    int ret = bdrv_co_writev(bs->file->bs, sector_num, nb_sectors, qiov);
+    int ret = bdrv_co_pwritev(bs->file->bs, offset, bytes, qiov, flags);
     block_request_create(reqid, bs, qemu_coroutine_self());
     qemu_coroutine_yield();
 
@@ -144,8 +144,8 @@ static BlockDriver bdrv_blkreplay = {
     .bdrv_close             = blkreplay_close,
     .bdrv_getlength         = blkreplay_getlength,
 
-    .bdrv_co_readv          = blkreplay_co_readv,
-    .bdrv_co_writev         = blkreplay_co_writev,
+    .bdrv_co_preadv         = blkreplay_co_preadv,
+    .bdrv_co_pwritev        = blkreplay_co_pwritev,
 
     .bdrv_co_pwrite_zeroes  = blkreplay_co_pwrite_zeroes,
     .bdrv_co_discard        = blkreplay_co_discard,
-- 
1.8.3.1

[Qemu-devel] [PULL 28/43] vhdx: Some more BlockBackend use in vhdx_create()

[Kevin Wolf]

This does some easy conversions from bdrv_* to blk_* functions in
vhdx_create(). We should avoid bypassing the BlockBackend layer whenever
possible.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/vhdx.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/block/vhdx.c b/block/vhdx.c
index f5605a2..33b81e2 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1387,9 +1387,10 @@ exit:
  * There are 2 headers, and the highest sequence number will represent
  * the active header
  */
-static int vhdx_create_new_headers(BlockDriverState *bs, uint64_t image_size,
+static int vhdx_create_new_headers(BlockBackend *blk, uint64_t image_size,
                                    uint32_t log_size)
 {
+    BlockDriverState *bs = blk_bs(blk);
     int ret = 0;
     VHDXHeader *hdr = NULL;
 
@@ -1442,7 +1443,7 @@ exit:
  * The first 64KB of the Metadata section is reserved for the metadata
  * header and entries; beyond that, the metadata items themselves reside.
  */
-static int vhdx_create_new_metadata(BlockDriverState *bs,
+static int vhdx_create_new_metadata(BlockBackend *blk,
                                     uint64_t image_size,
                                     uint32_t block_size,
                                     uint32_t sector_size,
@@ -1538,13 +1539,13 @@ static int vhdx_create_new_metadata(BlockDriverState *bs,
                                    VHDX_META_FLAGS_IS_VIRTUAL_DISK;
     vhdx_metadata_entry_le_export(&md_table_entry[4]);
 
-    ret = bdrv_pwrite(bs, metadata_offset, buffer, VHDX_HEADER_BLOCK_SIZE);
+    ret = blk_pwrite(blk, metadata_offset, buffer, VHDX_HEADER_BLOCK_SIZE, 0);
     if (ret < 0) {
         goto exit;
     }
 
-    ret = bdrv_pwrite(bs, metadata_offset + (64 * KiB), entry_buffer,
-                      VHDX_METADATA_ENTRY_BUFFER_SIZE);
+    ret = blk_pwrite(blk, metadata_offset + (64 * KiB), entry_buffer,
+                     VHDX_METADATA_ENTRY_BUFFER_SIZE, 0);
     if (ret < 0) {
         goto exit;
     }
@@ -1564,7 +1565,7 @@ exit:
  *  Fixed images: default state of the BAT is fully populated, with
  *                file offsets and state PAYLOAD_BLOCK_FULLY_PRESENT.
  */
-static int vhdx_create_bat(BlockDriverState *bs, BDRVVHDXState *s,
+static int vhdx_create_bat(BlockBackend *blk, BDRVVHDXState *s,
                            uint64_t image_size, VHDXImageType type,
                            bool use_zero_blocks, uint64_t file_offset,
                            uint32_t length)
@@ -1588,12 +1589,12 @@ static int vhdx_create_bat(BlockDriverState *bs, BDRVVHDXState *s,
     if (type == VHDX_TYPE_DYNAMIC) {
         /* All zeroes, so we can just extend the file - the end of the BAT
          * is the furthest thing we have written yet */
-        ret = bdrv_truncate(bs, data_file_offset);
+        ret = blk_truncate(blk, data_file_offset);
         if (ret < 0) {
             goto exit;
         }
     } else if (type == VHDX_TYPE_FIXED) {
-        ret = bdrv_truncate(bs, data_file_offset + image_size);
+        ret = blk_truncate(blk, data_file_offset + image_size);
         if (ret < 0) {
             goto exit;
         }
@@ -1604,7 +1605,7 @@ static int vhdx_create_bat(BlockDriverState *bs, BDRVVHDXState *s,
 
     if (type == VHDX_TYPE_FIXED ||
                 use_zero_blocks ||
-                bdrv_has_zero_init(bs) == 0) {
+                bdrv_has_zero_init(blk_bs(blk)) == 0) {
         /* for a fixed file, the default BAT entry is not zero */
         s->bat = g_try_malloc0(length);
         if (length && s->bat == NULL) {
@@ -1620,12 +1621,12 @@ static int vhdx_create_bat(BlockDriverState *bs, BDRVVHDXState *s,
             sinfo.file_offset = data_file_offset +
                                 (sector_num << s->logical_sector_size_bits);
             sinfo.file_offset = ROUND_UP(sinfo.file_offset, MiB);
-            vhdx_update_bat_table_entry(bs, s, &sinfo, &unused, &unused,
+            vhdx_update_bat_table_entry(blk_bs(blk), s, &sinfo, &unused, &unused,
                                         block_state);
             cpu_to_le64s(&s->bat[sinfo.bat_idx]);
             sector_num += s->sectors_per_block;
         }
-        ret = bdrv_pwrite(bs, file_offset, s->bat, length);
+        ret = blk_pwrite(blk, file_offset, s->bat, length, 0);
         if (ret < 0) {
             goto exit;
         }
@@ -1645,7 +1646,7 @@ exit:
  * to create the BAT itself, we will also cause the BAT to be
  * created.
  */
-static int vhdx_create_new_region_table(BlockDriverState *bs,
+static int vhdx_create_new_region_table(BlockBackend *blk,
                                         uint64_t image_size,
                                         uint32_t block_size,
                                         uint32_t sector_size,
@@ -1720,21 +1721,21 @@ static int vhdx_create_new_region_table(BlockDriverState *bs,
 
     /* The region table gives us the data we need to create the BAT,
      * so do that now */
-    ret = vhdx_create_bat(bs, s, image_size, type, use_zero_blocks,
+    ret = vhdx_create_bat(blk, s, image_size, type, use_zero_blocks,
                           bat_file_offset, bat_length);
     if (ret < 0) {
         goto exit;
     }
 
     /* Now write out the region headers to disk */
-    ret = bdrv_pwrite(bs, VHDX_REGION_TABLE_OFFSET, buffer,
-                      VHDX_HEADER_BLOCK_SIZE);
+    ret = blk_pwrite(blk, VHDX_REGION_TABLE_OFFSET, buffer,
+                     VHDX_HEADER_BLOCK_SIZE, 0);
     if (ret < 0) {
         goto exit;
     }
 
-    ret = bdrv_pwrite(bs, VHDX_REGION_TABLE2_OFFSET, buffer,
-                      VHDX_HEADER_BLOCK_SIZE);
+    ret = blk_pwrite(blk, VHDX_REGION_TABLE2_OFFSET, buffer,
+                     VHDX_HEADER_BLOCK_SIZE, 0);
     if (ret < 0) {
         goto exit;
     }
@@ -1871,13 +1872,13 @@ static int vhdx_create(const char *filename, QemuOpts *opts, Error **errp)
 
 
     /* Creates (B),(C) */
-    ret = vhdx_create_new_headers(blk_bs(blk), image_size, log_size);
+    ret = vhdx_create_new_headers(blk, image_size, log_size);
     if (ret < 0) {
         goto delete_and_exit;
     }
 
     /* Creates (D),(E),(G) explicitly. (F) created as by-product */
-    ret = vhdx_create_new_region_table(blk_bs(blk), image_size, block_size, 512,
+    ret = vhdx_create_new_region_table(blk, image_size, block_size, 512,
                                        log_size, use_zero_blocks, image_type,
                                        &metadata_offset);
     if (ret < 0) {
@@ -1885,7 +1886,7 @@ static int vhdx_create(const char *filename, QemuOpts *opts, Error **errp)
     }
 
     /* Creates (H) */
-    ret = vhdx_create_new_metadata(blk_bs(blk), image_size, block_size, 512,
+    ret = vhdx_create_new_metadata(blk, image_size, block_size, 512,
                                    metadata_offset, image_type);
     if (ret < 0) {
         goto delete_and_exit;
-- 
1.8.3.1

[Qemu-devel] [PULL 29/43] block: Convert bdrv_co_readv() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/crypto.c        | 2 +-
 block/io.c            | 8 ++++----
 block/parallels.c     | 2 +-
 block/qcow.c          | 5 ++---
 block/raw_bsd.c       | 2 +-
 block/vhdx.c          | 2 +-
 include/block/block.h | 4 ++--
 7 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/block/crypto.c b/block/crypto.c
index ec1f247..87b1e00 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -428,7 +428,7 @@ block_crypto_co_readv(BlockDriverState *bs, int64_t sector_num,
         qemu_iovec_reset(&hd_qiov);
         qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512);
 
-        ret = bdrv_co_readv(bs->file->bs,
+        ret = bdrv_co_readv(bs->file,
                             payload_offset + sector_num,
                             cur_nr_sectors, &hd_qiov);
         if (ret < 0) {
diff --git a/block/io.c b/block/io.c
index b9e53e3..c988e1b 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1141,12 +1141,12 @@ static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
                           nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
-int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
-    int nb_sectors, QEMUIOVector *qiov)
+int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
+                               int nb_sectors, QEMUIOVector *qiov)
 {
-    trace_bdrv_co_readv(bs, sector_num, nb_sectors);
+    trace_bdrv_co_readv(child->bs, sector_num, nb_sectors);
 
-    return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0);
+    return bdrv_co_do_readv(child->bs, sector_num, nb_sectors, qiov, 0);
 }
 
 /* Maximum buffer for write zeroes fallback, in bytes */
diff --git a/block/parallels.c b/block/parallels.c
index d6a1a61..7da01fb 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -351,7 +351,7 @@ static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
             qemu_iovec_reset(&hd_qiov);
             qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 
-            ret = bdrv_co_readv(bs->file->bs, position, n, &hd_qiov);
+            ret = bdrv_co_readv(bs->file, position, n, &hd_qiov);
             if (ret < 0) {
                 break;
             }
diff --git a/block/qcow.c b/block/qcow.c
index e4175b8..c8d4e5f 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -619,8 +619,7 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
                 hd_iov.iov_len = n * 512;
                 qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
                 qemu_co_mutex_unlock(&s->lock);
-                ret = bdrv_co_readv(bs->backing->bs, sector_num,
-                                    n, &hd_qiov);
+                ret = bdrv_co_readv(bs->backing, sector_num, n, &hd_qiov);
                 qemu_co_mutex_lock(&s->lock);
                 if (ret < 0) {
                     goto fail;
@@ -644,7 +643,7 @@ static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num,
             hd_iov.iov_len = n * 512;
             qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
             qemu_co_mutex_unlock(&s->lock);
-            ret = bdrv_co_readv(bs->file->bs,
+            ret = bdrv_co_readv(bs->file,
                                 (cluster_offset >> 9) + index_in_cluster,
                                 n, &hd_qiov);
             qemu_co_mutex_lock(&s->lock);
diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index 5855e84..90b296e 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -54,7 +54,7 @@ static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
                                      int nb_sectors, QEMUIOVector *qiov)
 {
     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
-    return bdrv_co_readv(bs->file->bs, sector_num, nb_sectors, qiov);
+    return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
 }
 
 static int coroutine_fn
diff --git a/block/vhdx.c b/block/vhdx.c
index 33b81e2..cca2540 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1117,7 +1117,7 @@ static coroutine_fn int vhdx_co_readv(BlockDriverState *bs, int64_t sector_num,
                 break;
             case PAYLOAD_BLOCK_FULLY_PRESENT:
                 qemu_co_mutex_unlock(&s->lock);
-                ret = bdrv_co_readv(bs->file->bs,
+                ret = bdrv_co_readv(bs->file,
                                     sinfo.file_offset >> BDRV_SECTOR_BITS,
                                     sinfo.sectors_avail, &hd_qiov);
                 qemu_co_mutex_lock(&s->lock);
diff --git a/include/block/block.h b/include/block/block.h
index 211a0f2..16ec088 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -241,8 +241,8 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
     const void *buf, int count);
-int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
-    int nb_sectors, QEMUIOVector *qiov);
+int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
+                               int nb_sectors, QEMUIOVector *qiov);
 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
     int nb_sectors, QEMUIOVector *qiov);
 /*
-- 
1.8.3.1

[Qemu-devel] [PULL 30/43] block: Convert bdrv_co_writev() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/crypto.c        | 2 +-
 block/io.c            | 6 +++---
 block/parallels.c     | 2 +-
 block/qcow.c          | 2 +-
 block/vhdx.c          | 2 +-
 include/block/block.h | 4 ++--
 6 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/block/crypto.c b/block/crypto.c
index 87b1e00..64bf095 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -507,7 +507,7 @@ block_crypto_co_writev(BlockDriverState *bs, int64_t sector_num,
         qemu_iovec_reset(&hd_qiov);
         qemu_iovec_add(&hd_qiov, cipher_data, cur_nr_sectors * 512);
 
-        ret = bdrv_co_writev(bs->file->bs,
+        ret = bdrv_co_writev(bs->file,
                              payload_offset + sector_num,
                              cur_nr_sectors, &hd_qiov);
         if (ret < 0) {
diff --git a/block/io.c b/block/io.c
index c988e1b..17e4ad4 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1547,12 +1547,12 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
                            nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
-int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
+int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
     int nb_sectors, QEMUIOVector *qiov)
 {
-    trace_bdrv_co_writev(bs, sector_num, nb_sectors);
+    trace_bdrv_co_writev(child->bs, sector_num, nb_sectors);
 
-    return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0);
+    return bdrv_co_do_writev(child->bs, sector_num, nb_sectors, qiov, 0);
 }
 
 int coroutine_fn bdrv_co_pwrite_zeroes(BlockDriverState *bs,
diff --git a/block/parallels.c b/block/parallels.c
index 7da01fb..91ab61f 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -311,7 +311,7 @@ static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
         qemu_iovec_reset(&hd_qiov);
         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 
-        ret = bdrv_co_writev(bs->file->bs, position, n, &hd_qiov);
+        ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
         if (ret < 0) {
             break;
         }
diff --git a/block/qcow.c b/block/qcow.c
index c8d4e5f..0db43f8 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -745,7 +745,7 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
         hd_iov.iov_len = n * 512;
         qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
         qemu_co_mutex_unlock(&s->lock);
-        ret = bdrv_co_writev(bs->file->bs,
+        ret = bdrv_co_writev(bs->file,
                              (cluster_offset >> 9) + index_in_cluster,
                              n, &hd_qiov);
         qemu_co_mutex_lock(&s->lock);
diff --git a/block/vhdx.c b/block/vhdx.c
index cca2540..b0f66de 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1326,7 +1326,7 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num,
                 }
                 /* block exists, so we can just overwrite it */
                 qemu_co_mutex_unlock(&s->lock);
-                ret = bdrv_co_writev(bs->file->bs,
+                ret = bdrv_co_writev(bs->file,
                                     sinfo.file_offset >> BDRV_SECTOR_BITS,
                                     sectors_to_write, &hd_qiov);
                 qemu_co_mutex_lock(&s->lock);
diff --git a/include/block/block.h b/include/block/block.h
index 16ec088..70b1b80 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -243,8 +243,8 @@ int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
     const void *buf, int count);
 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
                                int nb_sectors, QEMUIOVector *qiov);
-int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
-    int nb_sectors, QEMUIOVector *qiov);
+int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
+                               int nb_sectors, QEMUIOVector *qiov);
 /*
  * Efficiently zero a region of the disk image.  Note that this is a regular
  * I/O request like read or write and should have a reasonable size.  This
-- 
1.8.3.1

[Qemu-devel] [PULL 31/43] block: Convert bdrv_aio_readv() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/blkdebug.c      | 2 +-
 block/blkverify.c     | 4 ++--
 block/io.c            | 6 +++---
 block/qed-table.c     | 2 +-
 block/qed.c           | 6 +++---
 block/quorum.c        | 4 ++--
 include/block/block.h | 2 +-
 7 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/block/blkdebug.c b/block/blkdebug.c
index b6ecee3..499de40 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -457,7 +457,7 @@ static BlockAIOCB *blkdebug_aio_readv(BlockDriverState *bs,
         return inject_error(bs, cb, opaque, rule);
     }
 
-    return bdrv_aio_readv(bs->file->bs, sector_num, qiov, nb_sectors,
+    return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors,
                           cb, opaque);
 }
 
diff --git a/block/blkverify.c b/block/blkverify.c
index 4045396..4672fda 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -247,9 +247,9 @@ static BlockAIOCB *blkverify_aio_readv(BlockDriverState *bs,
     qemu_iovec_init(&acb->raw_qiov, acb->qiov->niov);
     qemu_iovec_clone(&acb->raw_qiov, qiov, acb->buf);
 
-    bdrv_aio_readv(s->test_file->bs, sector_num, qiov, nb_sectors,
+    bdrv_aio_readv(s->test_file, sector_num, qiov, nb_sectors,
                    blkverify_aio_cb, acb);
-    bdrv_aio_readv(bs->file->bs, sector_num, &acb->raw_qiov, nb_sectors,
+    bdrv_aio_readv(bs->file, sector_num, &acb->raw_qiov, nb_sectors,
                    blkverify_aio_cb, acb);
     return &acb->common;
 }
diff --git a/block/io.c b/block/io.c
index 17e4ad4..696a79d 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1962,13 +1962,13 @@ int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos)
 /**************************************************************/
 /* async I/Os */
 
-BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
+BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
                            QEMUIOVector *qiov, int nb_sectors,
                            BlockCompletionFunc *cb, void *opaque)
 {
-    trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
+    trace_bdrv_aio_readv(child->bs, sector_num, nb_sectors, opaque);
 
-    return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0,
+    return bdrv_co_aio_rw_vector(child->bs, sector_num, qiov, nb_sectors, 0,
                                  cb, opaque, false);
 }
 
diff --git a/block/qed-table.c b/block/qed-table.c
index c841ad1..2db0a33 100644
--- a/block/qed-table.c
+++ b/block/qed-table.c
@@ -65,7 +65,7 @@ static void qed_read_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
     read_table_cb->iov.iov_len = s->header.cluster_size * s->header.table_size,
 
     qemu_iovec_init_external(qiov, &read_table_cb->iov, 1);
-    bdrv_aio_readv(s->bs->file->bs, offset / BDRV_SECTOR_SIZE, qiov,
+    bdrv_aio_readv(s->bs->file, offset / BDRV_SECTOR_SIZE, qiov,
                    qiov->size / BDRV_SECTOR_SIZE,
                    qed_read_table_cb, read_table_cb);
 }
diff --git a/block/qed.c b/block/qed.c
index 1206806..7f71007 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -155,7 +155,7 @@ static void qed_write_header(BDRVQEDState *s, BlockCompletionFunc cb,
     write_header_cb->iov.iov_len = len;
     qemu_iovec_init_external(&write_header_cb->qiov, &write_header_cb->iov, 1);
 
-    bdrv_aio_readv(s->bs->file->bs, 0, &write_header_cb->qiov, nsectors,
+    bdrv_aio_readv(s->bs->file, 0, &write_header_cb->qiov, nsectors,
                    qed_write_header_read_cb, write_header_cb);
 }
 
@@ -800,7 +800,7 @@ static void qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
     qemu_iovec_concat(*backing_qiov, qiov, 0, size);
 
     BLKDBG_EVENT(s->bs->file, BLKDBG_READ_BACKING_AIO);
-    bdrv_aio_readv(s->bs->backing->bs, pos / BDRV_SECTOR_SIZE,
+    bdrv_aio_readv(s->bs->backing, pos / BDRV_SECTOR_SIZE,
                    *backing_qiov, size / BDRV_SECTOR_SIZE, cb, opaque);
 }
 
@@ -1319,7 +1319,7 @@ static void qed_aio_read_data(void *opaque, int ret,
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
-    bdrv_aio_readv(bs->file->bs, offset / BDRV_SECTOR_SIZE,
+    bdrv_aio_readv(bs->file, offset / BDRV_SECTOR_SIZE,
                    &acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
                    qed_aio_next_io, acb);
     return;
diff --git a/block/quorum.c b/block/quorum.c
index 331b726..c365c78 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -660,7 +660,7 @@ static BlockAIOCB *read_quorum_children(QuorumAIOCB *acb)
     }
 
     for (i = 0; i < s->num_children; i++) {
-        acb->qcrs[i].aiocb = bdrv_aio_readv(s->children[i]->bs, acb->sector_num,
+        acb->qcrs[i].aiocb = bdrv_aio_readv(s->children[i], acb->sector_num,
                                             &acb->qcrs[i].qiov, acb->nb_sectors,
                                             quorum_aio_cb, &acb->qcrs[i]);
     }
@@ -678,7 +678,7 @@ static BlockAIOCB *read_fifo_child(QuorumAIOCB *acb)
     qemu_iovec_clone(&acb->qcrs[acb->child_iter].qiov, acb->qiov,
                      acb->qcrs[acb->child_iter].buf);
     acb->qcrs[acb->child_iter].aiocb =
-        bdrv_aio_readv(s->children[acb->child_iter]->bs, acb->sector_num,
+        bdrv_aio_readv(s->children[acb->child_iter], acb->sector_num,
                        &acb->qcrs[acb->child_iter].qiov, acb->nb_sectors,
                        quorum_aio_cb, &acb->qcrs[acb->child_iter]);
 
diff --git a/include/block/block.h b/include/block/block.h
index 70b1b80..ac8a1d7 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -310,7 +310,7 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
                                         const char *node_name, Error **errp);
 
 /* async block I/O */
-BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
+BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
                            QEMUIOVector *iov, int nb_sectors,
                            BlockCompletionFunc *cb, void *opaque);
 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
-- 
1.8.3.1

[Qemu-devel] [PULL 32/43] block: Convert bdrv_aio_writev() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/blkdebug.c      | 2 +-
 block/blkverify.c     | 4 ++--
 block/io.c            | 6 +++---
 block/qed-table.c     | 2 +-
 block/qed.c           | 6 +++---
 block/quorum.c        | 4 ++--
 include/block/block.h | 2 +-
 7 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/block/blkdebug.c b/block/blkdebug.c
index 499de40..bbaa33f 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -480,7 +480,7 @@ static BlockAIOCB *blkdebug_aio_writev(BlockDriverState *bs,
         return inject_error(bs, cb, opaque, rule);
     }
 
-    return bdrv_aio_writev(bs->file->bs, sector_num, qiov, nb_sectors,
+    return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors,
                            cb, opaque);
 }
 
diff --git a/block/blkverify.c b/block/blkverify.c
index 4672fda..da62d75 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -262,9 +262,9 @@ static BlockAIOCB *blkverify_aio_writev(BlockDriverState *bs,
     BlkverifyAIOCB *acb = blkverify_aio_get(bs, true, sector_num, qiov,
                                             nb_sectors, cb, opaque);
 
-    bdrv_aio_writev(s->test_file->bs, sector_num, qiov, nb_sectors,
+    bdrv_aio_writev(s->test_file, sector_num, qiov, nb_sectors,
                     blkverify_aio_cb, acb);
-    bdrv_aio_writev(bs->file->bs, sector_num, qiov, nb_sectors,
+    bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors,
                     blkverify_aio_cb, acb);
     return &acb->common;
 }
diff --git a/block/io.c b/block/io.c
index 696a79d..e929521 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1972,13 +1972,13 @@ BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
                                  cb, opaque, false);
 }
 
-BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
+BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
                             QEMUIOVector *qiov, int nb_sectors,
                             BlockCompletionFunc *cb, void *opaque)
 {
-    trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
+    trace_bdrv_aio_writev(child->bs, sector_num, nb_sectors, opaque);
 
-    return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0,
+    return bdrv_co_aio_rw_vector(child->bs, sector_num, qiov, nb_sectors, 0,
                                  cb, opaque, true);
 }
 
diff --git a/block/qed-table.c b/block/qed-table.c
index 2db0a33..1a731df 100644
--- a/block/qed-table.c
+++ b/block/qed-table.c
@@ -154,7 +154,7 @@ static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
     /* Adjust for offset into table */
     offset += start * sizeof(uint64_t);
 
-    bdrv_aio_writev(s->bs->file->bs, offset / BDRV_SECTOR_SIZE,
+    bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
                     &write_table_cb->qiov,
                     write_table_cb->qiov.size / BDRV_SECTOR_SIZE,
                     qed_write_table_cb, write_table_cb);
diff --git a/block/qed.c b/block/qed.c
index 7f71007..9d3d588 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -123,7 +123,7 @@ static void qed_write_header_read_cb(void *opaque, int ret)
     /* Update header */
     qed_header_cpu_to_le(&s->header, (QEDHeader *)write_header_cb->buf);
 
-    bdrv_aio_writev(s->bs->file->bs, 0, &write_header_cb->qiov,
+    bdrv_aio_writev(s->bs->file, 0, &write_header_cb->qiov,
                     write_header_cb->nsectors, qed_write_header_cb,
                     write_header_cb);
 }
@@ -837,7 +837,7 @@ static void qed_copy_from_backing_file_write(void *opaque, int ret)
     }
 
     BLKDBG_EVENT(s->bs->file, BLKDBG_COW_WRITE);
-    bdrv_aio_writev(s->bs->file->bs, copy_cb->offset / BDRV_SECTOR_SIZE,
+    bdrv_aio_writev(s->bs->file, copy_cb->offset / BDRV_SECTOR_SIZE,
                     &copy_cb->qiov, copy_cb->qiov.size / BDRV_SECTOR_SIZE,
                     qed_copy_from_backing_file_cb, copy_cb);
 }
@@ -1087,7 +1087,7 @@ static void qed_aio_write_main(void *opaque, int ret)
     }
 
     BLKDBG_EVENT(s->bs->file, BLKDBG_WRITE_AIO);
-    bdrv_aio_writev(s->bs->file->bs, offset / BDRV_SECTOR_SIZE,
+    bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
                     &acb->cur_qiov, acb->cur_qiov.size / BDRV_SECTOR_SIZE,
                     next_fn, acb);
 }
diff --git a/block/quorum.c b/block/quorum.c
index c365c78..9cf876f 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -383,7 +383,7 @@ static bool quorum_rewrite_bad_versions(BDRVQuorumState *s, QuorumAIOCB *acb,
             continue;
         }
         QLIST_FOREACH(item, &version->items, next) {
-            bdrv_aio_writev(s->children[item->index]->bs, acb->sector_num,
+            bdrv_aio_writev(s->children[item->index], acb->sector_num,
                             acb->qiov, acb->nb_sectors, quorum_rewrite_aio_cb,
                             acb);
         }
@@ -719,7 +719,7 @@ static BlockAIOCB *quorum_aio_writev(BlockDriverState *bs,
     int i;
 
     for (i = 0; i < s->num_children; i++) {
-        acb->qcrs[i].aiocb = bdrv_aio_writev(s->children[i]->bs, sector_num,
+        acb->qcrs[i].aiocb = bdrv_aio_writev(s->children[i], sector_num,
                                              qiov, nb_sectors, &quorum_aio_cb,
                                              &acb->qcrs[i]);
     }
diff --git a/include/block/block.h b/include/block/block.h
index ac8a1d7..fce8c81 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -313,7 +313,7 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
 BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
                            QEMUIOVector *iov, int nb_sectors,
                            BlockCompletionFunc *cb, void *opaque);
-BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
+BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
                             QEMUIOVector *iov, int nb_sectors,
                             BlockCompletionFunc *cb, void *opaque);
 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
-- 
1.8.3.1

[Qemu-devel] [PULL 33/43] block: Convert bdrv_co_do_readv/writev to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/io.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/block/io.c b/block/io.c
index e929521..d8b3c96 100644
--- a/block/io.c
+++ b/block/io.c
@@ -33,7 +33,7 @@
 
 #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
 
-static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
+static BlockAIOCB *bdrv_co_aio_rw_vector(BdrvChild *child,
                                          int64_t sector_num,
                                          QEMUIOVector *qiov,
                                          int nb_sectors,
@@ -1129,7 +1129,7 @@ int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
     return ret;
 }
 
-static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
+static int coroutine_fn bdrv_co_do_readv(BdrvChild *child,
     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
     BdrvRequestFlags flags)
 {
@@ -1137,7 +1137,7 @@ static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
         return -EINVAL;
     }
 
-    return bdrv_co_preadv(bs, sector_num << BDRV_SECTOR_BITS,
+    return bdrv_co_preadv(child->bs, sector_num << BDRV_SECTOR_BITS,
                           nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
@@ -1146,7 +1146,7 @@ int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
 {
     trace_bdrv_co_readv(child->bs, sector_num, nb_sectors);
 
-    return bdrv_co_do_readv(child->bs, sector_num, nb_sectors, qiov, 0);
+    return bdrv_co_do_readv(child, sector_num, nb_sectors, qiov, 0);
 }
 
 /* Maximum buffer for write zeroes fallback, in bytes */
@@ -1535,7 +1535,7 @@ out:
     return ret;
 }
 
-static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
+static int coroutine_fn bdrv_co_do_writev(BdrvChild *child,
     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
     BdrvRequestFlags flags)
 {
@@ -1543,7 +1543,7 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
         return -EINVAL;
     }
 
-    return bdrv_co_pwritev(bs, sector_num << BDRV_SECTOR_BITS,
+    return bdrv_co_pwritev(child->bs, sector_num << BDRV_SECTOR_BITS,
                            nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
@@ -1552,7 +1552,7 @@ int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
 {
     trace_bdrv_co_writev(child->bs, sector_num, nb_sectors);
 
-    return bdrv_co_do_writev(child->bs, sector_num, nb_sectors, qiov, 0);
+    return bdrv_co_do_writev(child, sector_num, nb_sectors, qiov, 0);
 }
 
 int coroutine_fn bdrv_co_pwrite_zeroes(BlockDriverState *bs,
@@ -1968,7 +1968,7 @@ BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
 {
     trace_bdrv_aio_readv(child->bs, sector_num, nb_sectors, opaque);
 
-    return bdrv_co_aio_rw_vector(child->bs, sector_num, qiov, nb_sectors, 0,
+    return bdrv_co_aio_rw_vector(child, sector_num, qiov, nb_sectors, 0,
                                  cb, opaque, false);
 }
 
@@ -1978,7 +1978,7 @@ BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
 {
     trace_bdrv_aio_writev(child->bs, sector_num, nb_sectors, opaque);
 
-    return bdrv_co_aio_rw_vector(child->bs, sector_num, qiov, nb_sectors, 0,
+    return bdrv_co_aio_rw_vector(child, sector_num, qiov, nb_sectors, 0,
                                  cb, opaque, true);
 }
 
@@ -2034,6 +2034,7 @@ typedef struct BlockRequest {
 
 typedef struct BlockAIOCBCoroutine {
     BlockAIOCB common;
+    BdrvChild *child;
     BlockRequest req;
     bool is_write;
     bool need_bh;
@@ -2077,20 +2078,19 @@ static void bdrv_co_maybe_schedule_bh(BlockAIOCBCoroutine *acb)
 static void coroutine_fn bdrv_co_do_rw(void *opaque)
 {
     BlockAIOCBCoroutine *acb = opaque;
-    BlockDriverState *bs = acb->common.bs;
 
     if (!acb->is_write) {
-        acb->req.error = bdrv_co_do_readv(bs, acb->req.sector,
+        acb->req.error = bdrv_co_do_readv(acb->child, acb->req.sector,
             acb->req.nb_sectors, acb->req.qiov, acb->req.flags);
     } else {
-        acb->req.error = bdrv_co_do_writev(bs, acb->req.sector,
+        acb->req.error = bdrv_co_do_writev(acb->child, acb->req.sector,
             acb->req.nb_sectors, acb->req.qiov, acb->req.flags);
     }
 
     bdrv_co_complete(acb);
 }
 
-static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
+static BlockAIOCB *bdrv_co_aio_rw_vector(BdrvChild *child,
                                          int64_t sector_num,
                                          QEMUIOVector *qiov,
                                          int nb_sectors,
@@ -2102,7 +2102,8 @@ static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
     Coroutine *co;
     BlockAIOCBCoroutine *acb;
 
-    acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque);
+    acb = qemu_aio_get(&bdrv_em_co_aiocb_info, child->bs, cb, opaque);
+    acb->child = child;
     acb->need_bh = true;
     acb->req.error = -EINPROGRESS;
     acb->req.sector = sector_num;
-- 
1.8.3.1

[Qemu-devel] [PULL 34/43] block: Move bdrv_commit() to block/commit.c

[Kevin Wolf]

No code changes, just moved from one file to another.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block.c             | 110 ---------------------------------------------------
 block/Makefile.objs |   3 +-
 block/commit.c      | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+), 112 deletions(-)

diff --git a/block.c b/block.c
index 947df29..7603a0b 100644
--- a/block.c
+++ b/block.c
@@ -2322,116 +2322,6 @@ int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix)
     return bs->drv->bdrv_check(bs, res, fix);
 }
 
-#define COMMIT_BUF_SECTORS 2048
-
-/* commit COW file into the raw image */
-int bdrv_commit(BlockDriverState *bs)
-{
-    BlockDriver *drv = bs->drv;
-    int64_t sector, total_sectors, length, backing_length;
-    int n, ro, open_flags;
-    int ret = 0;
-    uint8_t *buf = NULL;
-
-    if (!drv)
-        return -ENOMEDIUM;
-
-    if (!bs->backing) {
-        return -ENOTSUP;
-    }
-
-    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) ||
-        bdrv_op_is_blocked(bs->backing->bs, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) {
-        return -EBUSY;
-    }
-
-    ro = bs->backing->bs->read_only;
-    open_flags =  bs->backing->bs->open_flags;
-
-    if (ro) {
-        if (bdrv_reopen(bs->backing->bs, open_flags | BDRV_O_RDWR, NULL)) {
-            return -EACCES;
-        }
-    }
-
-    length = bdrv_getlength(bs);
-    if (length < 0) {
-        ret = length;
-        goto ro_cleanup;
-    }
-
-    backing_length = bdrv_getlength(bs->backing->bs);
-    if (backing_length < 0) {
-        ret = backing_length;
-        goto ro_cleanup;
-    }
-
-    /* If our top snapshot is larger than the backing file image,
-     * grow the backing file image if possible.  If not possible,
-     * we must return an error */
-    if (length > backing_length) {
-        ret = bdrv_truncate(bs->backing->bs, length);
-        if (ret < 0) {
-            goto ro_cleanup;
-        }
-    }
-
-    total_sectors = length >> BDRV_SECTOR_BITS;
-
-    /* qemu_try_blockalign() for bs will choose an alignment that works for
-     * bs->backing->bs as well, so no need to compare the alignment manually. */
-    buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
-    if (buf == NULL) {
-        ret = -ENOMEM;
-        goto ro_cleanup;
-    }
-
-    for (sector = 0; sector < total_sectors; sector += n) {
-        ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n);
-        if (ret < 0) {
-            goto ro_cleanup;
-        }
-        if (ret) {
-            ret = bdrv_read(bs, sector, buf, n);
-            if (ret < 0) {
-                goto ro_cleanup;
-            }
-
-            ret = bdrv_write(bs->backing->bs, sector, buf, n);
-            if (ret < 0) {
-                goto ro_cleanup;
-            }
-        }
-    }
-
-    if (drv->bdrv_make_empty) {
-        ret = drv->bdrv_make_empty(bs);
-        if (ret < 0) {
-            goto ro_cleanup;
-        }
-        bdrv_flush(bs);
-    }
-
-    /*
-     * Make sure all data we wrote to the backing device is actually
-     * stable on disk.
-     */
-    if (bs->backing) {
-        bdrv_flush(bs->backing->bs);
-    }
-
-    ret = 0;
-ro_cleanup:
-    qemu_vfree(buf);
-
-    if (ro) {
-        /* ignoring error return here */
-        bdrv_reopen(bs->backing->bs, open_flags & ~BDRV_O_RDWR, NULL);
-    }
-
-    return ret;
-}
-
 /*
  * Return values:
  * 0        - success
diff --git a/block/Makefile.objs b/block/Makefile.objs
index 44a5416..2593a2f 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -9,7 +9,7 @@ block-obj-y += block-backend.o snapshot.o qapi.o
 block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o
 block-obj-$(CONFIG_POSIX) += raw-posix.o
 block-obj-$(CONFIG_LINUX_AIO) += linux-aio.o
-block-obj-y += null.o mirror.o io.o
+block-obj-y += null.o mirror.o commit.o io.o
 block-obj-y += throttle-groups.o
 
 block-obj-y += nbd.o nbd-client.o sheepdog.o
@@ -26,7 +26,6 @@ block-obj-y += write-threshold.o
 block-obj-y += crypto.o
 
 common-obj-y += stream.o
-common-obj-y += commit.o
 common-obj-y += backup.o
 
 iscsi.o-cflags     := $(LIBISCSI_CFLAGS)
diff --git a/block/commit.c b/block/commit.c
index 444333b..4ac3df3 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -282,3 +282,114 @@ void commit_start(BlockDriverState *bs, BlockDriverState *base,
     trace_commit_start(bs, base, top, s, s->common.co, opaque);
     qemu_coroutine_enter(s->common.co, s);
 }
+
+
+#define COMMIT_BUF_SECTORS 2048
+
+/* commit COW file into the raw image */
+int bdrv_commit(BlockDriverState *bs)
+{
+    BlockDriver *drv = bs->drv;
+    int64_t sector, total_sectors, length, backing_length;
+    int n, ro, open_flags;
+    int ret = 0;
+    uint8_t *buf = NULL;
+
+    if (!drv)
+        return -ENOMEDIUM;
+
+    if (!bs->backing) {
+        return -ENOTSUP;
+    }
+
+    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) ||
+        bdrv_op_is_blocked(bs->backing->bs, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) {
+        return -EBUSY;
+    }
+
+    ro = bs->backing->bs->read_only;
+    open_flags =  bs->backing->bs->open_flags;
+
+    if (ro) {
+        if (bdrv_reopen(bs->backing->bs, open_flags | BDRV_O_RDWR, NULL)) {
+            return -EACCES;
+        }
+    }
+
+    length = bdrv_getlength(bs);
+    if (length < 0) {
+        ret = length;
+        goto ro_cleanup;
+    }
+
+    backing_length = bdrv_getlength(bs->backing->bs);
+    if (backing_length < 0) {
+        ret = backing_length;
+        goto ro_cleanup;
+    }
+
+    /* If our top snapshot is larger than the backing file image,
+     * grow the backing file image if possible.  If not possible,
+     * we must return an error */
+    if (length > backing_length) {
+        ret = bdrv_truncate(bs->backing->bs, length);
+        if (ret < 0) {
+            goto ro_cleanup;
+        }
+    }
+
+    total_sectors = length >> BDRV_SECTOR_BITS;
+
+    /* qemu_try_blockalign() for bs will choose an alignment that works for
+     * bs->backing->bs as well, so no need to compare the alignment manually. */
+    buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
+    if (buf == NULL) {
+        ret = -ENOMEM;
+        goto ro_cleanup;
+    }
+
+    for (sector = 0; sector < total_sectors; sector += n) {
+        ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n);
+        if (ret < 0) {
+            goto ro_cleanup;
+        }
+        if (ret) {
+            ret = bdrv_read(bs, sector, buf, n);
+            if (ret < 0) {
+                goto ro_cleanup;
+            }
+
+            ret = bdrv_write(bs->backing->bs, sector, buf, n);
+            if (ret < 0) {
+                goto ro_cleanup;
+            }
+        }
+    }
+
+    if (drv->bdrv_make_empty) {
+        ret = drv->bdrv_make_empty(bs);
+        if (ret < 0) {
+            goto ro_cleanup;
+        }
+        bdrv_flush(bs);
+    }
+
+    /*
+     * Make sure all data we wrote to the backing device is actually
+     * stable on disk.
+     */
+    if (bs->backing) {
+        bdrv_flush(bs->backing->bs);
+    }
+
+    ret = 0;
+ro_cleanup:
+    qemu_vfree(buf);
+
+    if (ro) {
+        /* ignoring error return here */
+        bdrv_reopen(bs->backing->bs, open_flags & ~BDRV_O_RDWR, NULL);
+    }
+
+    return ret;
+}
-- 
1.8.3.1

[Qemu-devel] [PULL 35/43] block: Use BlockBackend for I/O in bdrv_commit()

[Kevin Wolf]

Just like block jobs, the HMP commit command should use its own
BlockBackend for doing I/O on BlockDriverStates.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/commit.c | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/block/commit.c b/block/commit.c
index 4ac3df3..379efb7 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -289,6 +289,7 @@ void commit_start(BlockDriverState *bs, BlockDriverState *base,
 /* commit COW file into the raw image */
 int bdrv_commit(BlockDriverState *bs)
 {
+    BlockBackend *src, *backing;
     BlockDriver *drv = bs->drv;
     int64_t sector, total_sectors, length, backing_length;
     int n, ro, open_flags;
@@ -316,13 +317,19 @@ int bdrv_commit(BlockDriverState *bs)
         }
     }
 
-    length = bdrv_getlength(bs);
+    src = blk_new();
+    blk_insert_bs(src, bs);
+
+    backing = blk_new();
+    blk_insert_bs(backing, bs->backing->bs);
+
+    length = blk_getlength(src);
     if (length < 0) {
         ret = length;
         goto ro_cleanup;
     }
 
-    backing_length = bdrv_getlength(bs->backing->bs);
+    backing_length = blk_getlength(backing);
     if (backing_length < 0) {
         ret = backing_length;
         goto ro_cleanup;
@@ -332,7 +339,7 @@ int bdrv_commit(BlockDriverState *bs)
      * grow the backing file image if possible.  If not possible,
      * we must return an error */
     if (length > backing_length) {
-        ret = bdrv_truncate(bs->backing->bs, length);
+        ret = blk_truncate(backing, length);
         if (ret < 0) {
             goto ro_cleanup;
         }
@@ -340,9 +347,9 @@ int bdrv_commit(BlockDriverState *bs)
 
     total_sectors = length >> BDRV_SECTOR_BITS;
 
-    /* qemu_try_blockalign() for bs will choose an alignment that works for
-     * bs->backing->bs as well, so no need to compare the alignment manually. */
-    buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
+    /* blk_try_blockalign() for src will choose an alignment that works for
+     * backing as well, so no need to compare the alignment manually. */
+    buf = blk_try_blockalign(src, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
     if (buf == NULL) {
         ret = -ENOMEM;
         goto ro_cleanup;
@@ -354,12 +361,14 @@ int bdrv_commit(BlockDriverState *bs)
             goto ro_cleanup;
         }
         if (ret) {
-            ret = bdrv_read(bs, sector, buf, n);
+            ret = blk_pread(src, sector * BDRV_SECTOR_SIZE, buf,
+                            n * BDRV_SECTOR_SIZE);
             if (ret < 0) {
                 goto ro_cleanup;
             }
 
-            ret = bdrv_write(bs->backing->bs, sector, buf, n);
+            ret = blk_pwrite(backing, sector * BDRV_SECTOR_SIZE, buf,
+                             n * BDRV_SECTOR_SIZE, 0);
             if (ret < 0) {
                 goto ro_cleanup;
             }
@@ -371,21 +380,22 @@ int bdrv_commit(BlockDriverState *bs)
         if (ret < 0) {
             goto ro_cleanup;
         }
-        bdrv_flush(bs);
+        blk_flush(src);
     }
 
     /*
      * Make sure all data we wrote to the backing device is actually
      * stable on disk.
      */
-    if (bs->backing) {
-        bdrv_flush(bs->backing->bs);
-    }
+    blk_flush(backing);
 
     ret = 0;
 ro_cleanup:
     qemu_vfree(buf);
 
+    blk_unref(src);
+    blk_unref(backing);
+
     if (ro) {
         /* ignoring error return here */
         bdrv_reopen(bs->backing->bs, open_flags & ~BDRV_O_RDWR, NULL);
-- 
1.8.3.1

[Qemu-devel] [PULL 36/43] block: Convert bdrv_read() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/io.c            | 4 ++--
 block/qcow2-cluster.c | 6 +++---
 block/vdi.c           | 4 ++--
 block/vvfat.c         | 2 +-
 include/block/block.h | 2 +-
 5 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/block/io.c b/block/io.c
index d8b3c96..6dfc0eb 100644
--- a/block/io.c
+++ b/block/io.c
@@ -630,10 +630,10 @@ static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
 }
 
 /* return < 0 if error. See bdrv_write() for the return codes */
-int bdrv_read(BlockDriverState *bs, int64_t sector_num,
+int bdrv_read(BdrvChild *child, int64_t sector_num,
               uint8_t *buf, int nb_sectors)
 {
-    return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0);
+    return bdrv_rw_co(child->bs, sector_num, buf, nb_sectors, false, 0);
 }
 
 /* Return < 0 if error. Important errors are:
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 0fb4356..c1e9eee 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1408,7 +1408,7 @@ int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
         sector_offset = coffset & 511;
         csize = nb_csectors * 512 - sector_offset;
         BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED);
-        ret = bdrv_read(bs->file->bs, coffset >> 9, s->cluster_data,
+        ret = bdrv_read(bs->file, coffset >> 9, s->cluster_data,
                         nb_csectors);
         if (ret < 0) {
             return ret;
@@ -1677,7 +1677,7 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
                     (void **)&l2_table);
         } else {
             /* load inactive L2 tables from disk */
-            ret = bdrv_read(bs->file->bs, l2_offset / BDRV_SECTOR_SIZE,
+            ret = bdrv_read(bs->file, l2_offset / BDRV_SECTOR_SIZE,
                             (void *)l2_table, s->cluster_sectors);
         }
         if (ret < 0) {
@@ -1859,7 +1859,7 @@ int qcow2_expand_zero_clusters(BlockDriverState *bs,
 
         l1_table = g_realloc(l1_table, l1_sectors * BDRV_SECTOR_SIZE);
 
-        ret = bdrv_read(bs->file->bs,
+        ret = bdrv_read(bs->file,
                         s->snapshots[i].l1_table_offset / BDRV_SECTOR_SIZE,
                         (void *)l1_table, l1_sectors);
         if (ret < 0) {
diff --git a/block/vdi.c b/block/vdi.c
index 7d9ab9c..46a3436 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -403,7 +403,7 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
 
     logout("\n");
 
-    ret = bdrv_read(bs->file->bs, 0, (uint8_t *)&header, 1);
+    ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1);
     if (ret < 0) {
         goto fail;
     }
@@ -500,7 +500,7 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
-    ret = bdrv_read(bs->file->bs, s->bmap_sector, (uint8_t *)s->bmap,
+    ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap,
                     bmap_size);
     if (ret < 0) {
         goto fail_free_bmap;
diff --git a/block/vvfat.c b/block/vvfat.c
index be9036e..5f980bb 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1393,7 +1393,7 @@ static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
             if (bdrv_is_allocated(s->qcow->bs, sector_num, nb_sectors-i, &n)) {
                 DLOG(fprintf(stderr, "sectors %d+%d allocated\n",
                              (int)sector_num, n));
-                if (bdrv_read(s->qcow->bs, sector_num, buf + i * 0x200, n)) {
+                if (bdrv_read(s->qcow, sector_num, buf + i * 0x200, n)) {
                     return -1;
                 }
                 i += n - 1;
diff --git a/include/block/block.h b/include/block/block.h
index fce8c81..b6744ab 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -226,7 +226,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
                         BlockReopenQueue *queue, Error **errp);
 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
-int bdrv_read(BlockDriverState *bs, int64_t sector_num,
+int bdrv_read(BdrvChild *child, int64_t sector_num,
               uint8_t *buf, int nb_sectors);
 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
                const uint8_t *buf, int nb_sectors);
-- 
1.8.3.1

[Qemu-devel] [PULL 37/43] block: Convert bdrv_write() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/io.c             |  5 +++--
 block/qcow.c           | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 block/qcow2-cluster.c  |  2 +-
 block/qcow2-refcount.c |  2 +-
 block/qcow2.c          | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 block/vdi.c            |  4 ++--
 block/vvfat.c          |  5 ++---
 include/block/block.h  |  2 +-
 8 files changed, 100 insertions(+), 12 deletions(-)

diff --git a/block/io.c b/block/io.c
index 6dfc0eb..2e04a80 100644
--- a/block/io.c
+++ b/block/io.c
@@ -642,10 +642,11 @@ int bdrv_read(BdrvChild *child, int64_t sector_num,
   -EINVAL      Invalid sector number or nb_sectors
   -EACCES      Trying to write a read-only device
 */
-int bdrv_write(BlockDriverState *bs, int64_t sector_num,
+int bdrv_write(BdrvChild *child, int64_t sector_num,
                const uint8_t *buf, int nb_sectors)
 {
-    return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0);
+    return bdrv_rw_co(child->bs, sector_num, (uint8_t *)buf, nb_sectors,
+                      true, 0);
 }
 
 int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
diff --git a/block/qcow.c b/block/qcow.c
index 0db43f8..674595e 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -913,6 +913,49 @@ static int qcow_make_empty(BlockDriverState *bs)
     return 0;
 }
 
+typedef struct QcowWriteCo {
+    BlockDriverState *bs;
+    int64_t sector_num;
+    const uint8_t *buf;
+    int nb_sectors;
+    int ret;
+} QcowWriteCo;
+
+static void qcow_write_co_entry(void *opaque)
+{
+    QcowWriteCo *co = opaque;
+    QEMUIOVector qiov;
+
+    struct iovec iov = (struct iovec) {
+        .iov_base   = (uint8_t*) co->buf,
+        .iov_len    = co->nb_sectors * BDRV_SECTOR_SIZE,
+    };
+    qemu_iovec_init_external(&qiov, &iov, 1);
+
+    co->ret = qcow_co_writev(co->bs, co->sector_num, co->nb_sectors, &qiov);
+}
+
+/* Wrapper for non-coroutine contexts */
+static int qcow_write(BlockDriverState *bs, int64_t sector_num,
+                      const uint8_t *buf, int nb_sectors)
+{
+    Coroutine *co;
+    AioContext *aio_context = bdrv_get_aio_context(bs);
+    QcowWriteCo data = {
+        .bs         = bs,
+        .sector_num = sector_num,
+        .buf        = buf,
+        .nb_sectors = nb_sectors,
+        .ret        = -EINPROGRESS,
+    };
+    co = qemu_coroutine_create(qcow_write_co_entry);
+    qemu_coroutine_enter(co, &data);
+    while (data.ret == -EINPROGRESS) {
+        aio_poll(aio_context, true);
+    }
+    return data.ret;
+}
+
 /* XXX: put compressed sectors first, then all the cluster aligned
    tables to avoid losing bytes in alignment */
 static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
@@ -969,7 +1012,7 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
 
     if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
         /* could not compress: write normal cluster */
-        ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
+        ret = qcow_write(bs, sector_num, buf, s->cluster_sectors);
         if (ret < 0) {
             goto fail;
         }
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index c1e9eee..a2490d7 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1784,7 +1784,7 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
                     goto fail;
                 }
 
-                ret = bdrv_write(bs->file->bs, l2_offset / BDRV_SECTOR_SIZE,
+                ret = bdrv_write(bs->file, l2_offset / BDRV_SECTOR_SIZE,
                                  (void *)l2_table, s->cluster_sectors);
                 if (ret < 0) {
                     goto fail;
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 3bef410..12e7e6b 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -2098,7 +2098,7 @@ write_refblocks:
         on_disk_refblock = (void *)((char *) *refcount_table +
                                     refblock_index * s->cluster_size);
 
-        ret = bdrv_write(bs->file->bs, refblock_offset / BDRV_SECTOR_SIZE,
+        ret = bdrv_write(bs->file, refblock_offset / BDRV_SECTOR_SIZE,
                          on_disk_refblock, s->cluster_sectors);
         if (ret < 0) {
             fprintf(stderr, "ERROR writing refblock: %s\n", strerror(-ret));
diff --git a/block/qcow2.c b/block/qcow2.c
index 0178931..cd9c27b 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2533,6 +2533,51 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
     return 0;
 }
 
+typedef struct Qcow2WriteCo {
+    BlockDriverState *bs;
+    int64_t sector_num;
+    const uint8_t *buf;
+    int nb_sectors;
+    int ret;
+} Qcow2WriteCo;
+
+static void qcow2_write_co_entry(void *opaque)
+{
+    Qcow2WriteCo *co = opaque;
+    QEMUIOVector qiov;
+    uint64_t offset = co->sector_num * BDRV_SECTOR_SIZE;
+    uint64_t bytes = co->nb_sectors * BDRV_SECTOR_SIZE;
+
+    struct iovec iov = (struct iovec) {
+        .iov_base   = (uint8_t*) co->buf,
+        .iov_len    = bytes,
+    };
+    qemu_iovec_init_external(&qiov, &iov, 1);
+
+    co->ret = qcow2_co_pwritev(co->bs, offset, bytes, &qiov, 0);
+}
+
+/* Wrapper for non-coroutine contexts */
+static int qcow2_write(BlockDriverState *bs, int64_t sector_num,
+                       const uint8_t *buf, int nb_sectors)
+{
+    Coroutine *co;
+    AioContext *aio_context = bdrv_get_aio_context(bs);
+    Qcow2WriteCo data = {
+        .bs         = bs,
+        .sector_num = sector_num,
+        .buf        = buf,
+        .nb_sectors = nb_sectors,
+        .ret        = -EINPROGRESS,
+    };
+    co = qemu_coroutine_create(qcow2_write_co_entry);
+    qemu_coroutine_enter(co, &data);
+    while (data.ret == -EINPROGRESS) {
+        aio_poll(aio_context, true);
+    }
+    return data.ret;
+}
+
 /* XXX: put compressed sectors first, then all the cluster aligned
    tables to avoid losing bytes in alignment */
 static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
@@ -2596,7 +2641,7 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
 
     if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
         /* could not compress: write normal cluster */
-        ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors);
+        ret = qcow2_write(bs, sector_num, buf, s->cluster_sectors);
         if (ret < 0) {
             goto fail;
         }
diff --git a/block/vdi.c b/block/vdi.c
index 46a3436..b2871ca 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -719,7 +719,7 @@ vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
         assert(VDI_IS_ALLOCATED(bmap_first));
         *header = s->header;
         vdi_header_to_le(header);
-        ret = bdrv_write(bs->file->bs, 0, block, 1);
+        ret = bdrv_write(bs->file, 0, block, 1);
         g_free(block);
         block = NULL;
 
@@ -737,7 +737,7 @@ vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
         base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE;
         logout("will write %u block map sectors starting from entry %u\n",
                n_sectors, bmap_first);
-        ret = bdrv_write(bs->file->bs, offset, base, n_sectors);
+        ret = bdrv_write(bs->file, offset, base, n_sectors);
     }
 
     return ret;
diff --git a/block/vvfat.c b/block/vvfat.c
index 5f980bb..c3f24c6 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1834,8 +1834,7 @@ static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
                         if (res) {
                             return -1;
                         }
-                        res = bdrv_write(s->qcow->bs, offset,
-                                         s->cluster_buffer, 1);
+                        res = bdrv_write(s->qcow, offset, s->cluster_buffer, 1);
                         if (res) {
                             return -2;
                         }
@@ -2889,7 +2888,7 @@ DLOG(checkpoint());
      * Use qcow backend. Commit later.
      */
 DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
-    ret = bdrv_write(s->qcow->bs, sector_num, buf, nb_sectors);
+    ret = bdrv_write(s->qcow, sector_num, buf, nb_sectors);
     if (ret < 0) {
 	fprintf(stderr, "Error writing to qcow backend\n");
 	return ret;
diff --git a/include/block/block.h b/include/block/block.h
index b6744ab..ea17936 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -228,7 +228,7 @@ void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 int bdrv_read(BdrvChild *child, int64_t sector_num,
               uint8_t *buf, int nb_sectors);
-int bdrv_write(BlockDriverState *bs, int64_t sector_num,
+int bdrv_write(BdrvChild *child, int64_t sector_num,
                const uint8_t *buf, int nb_sectors);
 int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
                        int count, BdrvRequestFlags flags);
-- 
1.8.3.1

[Qemu-devel] [PULL 38/43] block: Convert bdrv_pread(v) to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block.c                |  7 ++++---
 block/bochs.c          |  6 +++---
 block/cloop.c          |  8 ++++----
 block/crypto.c         |  2 +-
 block/dmg.c            | 21 +++++++++++----------
 block/io.c             |  8 ++++----
 block/parallels.c      |  4 ++--
 block/qcow.c           | 10 +++++-----
 block/qcow2-cache.c    |  2 +-
 block/qcow2-refcount.c | 12 ++++++------
 block/qcow2-snapshot.c | 12 ++++++------
 block/qcow2.c          | 16 ++++++++--------
 block/qed.c            |  6 +++---
 block/vhdx-log.c       |  8 ++++----
 block/vhdx.c           | 38 +++++++++++++++++++++++---------------
 block/vmdk.c           | 36 +++++++++++++++++-------------------
 block/vpc.c            |  8 ++++----
 include/block/block.h  |  5 ++---
 18 files changed, 108 insertions(+), 101 deletions(-)

diff --git a/block.c b/block.c
index 7603a0b..823ff1d 100644
--- a/block.c
+++ b/block.c
@@ -536,9 +536,10 @@ BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
     return drv;
 }
 
-static int find_image_format(BlockDriverState *bs, const char *filename,
+static int find_image_format(BdrvChild *file, const char *filename,
                              BlockDriver **pdrv, Error **errp)
 {
+    BlockDriverState *bs = file->bs;
     BlockDriver *drv;
     uint8_t buf[BLOCK_PROBE_BUF_SIZE];
     int ret = 0;
@@ -549,7 +550,7 @@ static int find_image_format(BlockDriverState *bs, const char *filename,
         return ret;
     }
 
-    ret = bdrv_pread(bs, 0, buf, sizeof(buf));
+    ret = bdrv_pread(file, 0, buf, sizeof(buf));
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Could not read image for determining its "
                          "format");
@@ -1652,7 +1653,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
     /* Image format probing */
     bs->probed = !drv;
     if (!drv && file) {
-        ret = find_image_format(file->bs, filename, &drv, &local_err);
+        ret = find_image_format(file, filename, &drv, &local_err);
         if (ret < 0) {
             goto fail;
         }
diff --git a/block/bochs.c b/block/bochs.c
index 6427ad4..46f635f 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -106,7 +106,7 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
 
     bs->read_only = true; /* no write support yet */
 
-    ret = bdrv_pread(bs->file->bs, 0, &bochs, sizeof(bochs));
+    ret = bdrv_pread(bs->file, 0, &bochs, sizeof(bochs));
     if (ret < 0) {
         return ret;
     }
@@ -140,7 +140,7 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
         return -ENOMEM;
     }
 
-    ret = bdrv_pread(bs->file->bs, le32_to_cpu(bochs.header), s->catalog_bitmap,
+    ret = bdrv_pread(bs->file, le32_to_cpu(bochs.header), s->catalog_bitmap,
                      s->catalog_size * 4);
     if (ret < 0) {
         goto fail;
@@ -214,7 +214,7 @@ static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
         (s->extent_blocks + s->bitmap_blocks));
 
     /* read in bitmap for current extent */
-    ret = bdrv_pread(bs->file->bs, bitmap_offset + (extent_offset / 8),
+    ret = bdrv_pread(bs->file, bitmap_offset + (extent_offset / 8),
                      &bitmap_entry, 1);
     if (ret < 0) {
         return ret;
diff --git a/block/cloop.c b/block/cloop.c
index 8f046e1..7b75f7e 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -69,7 +69,7 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
     bs->read_only = true;
 
     /* read header */
-    ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4);
+    ret = bdrv_pread(bs->file, 128, &s->block_size, 4);
     if (ret < 0) {
         return ret;
     }
@@ -95,7 +95,7 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
         return -EINVAL;
     }
 
-    ret = bdrv_pread(bs->file->bs, 128 + 4, &s->n_blocks, 4);
+    ret = bdrv_pread(bs->file, 128 + 4, &s->n_blocks, 4);
     if (ret < 0) {
         return ret;
     }
@@ -126,7 +126,7 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
         return -ENOMEM;
     }
 
-    ret = bdrv_pread(bs->file->bs, 128 + 4 + 4, s->offsets, offsets_size);
+    ret = bdrv_pread(bs->file, 128 + 4 + 4, s->offsets, offsets_size);
     if (ret < 0) {
         goto fail;
     }
@@ -211,7 +211,7 @@ static inline int cloop_read_block(BlockDriverState *bs, int block_num)
         int ret;
         uint32_t bytes = s->offsets[block_num + 1] - s->offsets[block_num];
 
-        ret = bdrv_pread(bs->file->bs, s->offsets[block_num],
+        ret = bdrv_pread(bs->file, s->offsets[block_num],
                          s->compressed_block, bytes);
         if (ret != bytes) {
             return -1;
diff --git a/block/crypto.c b/block/crypto.c
index 64bf095..cb8cbc2 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -64,7 +64,7 @@ static ssize_t block_crypto_read_func(QCryptoBlock *block,
     BlockDriverState *bs = opaque;
     ssize_t ret;
 
-    ret = bdrv_pread(bs->file->bs, offset, buf, buflen);
+    ret = bdrv_pread(bs->file, offset, buf, buflen);
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Could not read encryption header");
         return ret;
diff --git a/block/dmg.c b/block/dmg.c
index 11a0673..b0ed89b 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -86,7 +86,7 @@ static int read_uint64(BlockDriverState *bs, int64_t offset, uint64_t *result)
     uint64_t buffer;
     int ret;
 
-    ret = bdrv_pread(bs->file->bs, offset, &buffer, 8);
+    ret = bdrv_pread(bs->file, offset, &buffer, 8);
     if (ret < 0) {
         return ret;
     }
@@ -100,7 +100,7 @@ static int read_uint32(BlockDriverState *bs, int64_t offset, uint32_t *result)
     uint32_t buffer;
     int ret;
 
-    ret = bdrv_pread(bs->file->bs, offset, &buffer, 4);
+    ret = bdrv_pread(bs->file, offset, &buffer, 4);
     if (ret < 0) {
         return ret;
     }
@@ -153,8 +153,9 @@ static void update_max_chunk_size(BDRVDMGState *s, uint32_t chunk,
     }
 }
 
-static int64_t dmg_find_koly_offset(BlockDriverState *file_bs, Error **errp)
+static int64_t dmg_find_koly_offset(BdrvChild *file, Error **errp)
 {
+    BlockDriverState *file_bs = file->bs;
     int64_t length;
     int64_t offset = 0;
     uint8_t buffer[515];
@@ -178,7 +179,7 @@ static int64_t dmg_find_koly_offset(BlockDriverState *file_bs, Error **errp)
         offset = length - 511 - 512;
     }
     length = length < 515 ? length : 515;
-    ret = bdrv_pread(file_bs, offset, buffer, length);
+    ret = bdrv_pread(file, offset, buffer, length);
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Failed while reading UDIF trailer");
         return ret;
@@ -355,7 +356,7 @@ static int dmg_read_resource_fork(BlockDriverState *bs, DmgHeaderState *ds,
         offset += 4;
 
         buffer = g_realloc(buffer, count);
-        ret = bdrv_pread(bs->file->bs, offset, buffer, count);
+        ret = bdrv_pread(bs->file, offset, buffer, count);
         if (ret < 0) {
             goto fail;
         }
@@ -392,7 +393,7 @@ static int dmg_read_plist_xml(BlockDriverState *bs, DmgHeaderState *ds,
 
     buffer = g_malloc(info_length + 1);
     buffer[info_length] = '\0';
-    ret = bdrv_pread(bs->file->bs, info_begin, buffer, info_length);
+    ret = bdrv_pread(bs->file, info_begin, buffer, info_length);
     if (ret != info_length) {
         ret = -EINVAL;
         goto fail;
@@ -448,7 +449,7 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
     ds.max_sectors_per_chunk = 1;
 
     /* locate the UDIF trailer */
-    offset = dmg_find_koly_offset(bs->file->bs, errp);
+    offset = dmg_find_koly_offset(bs->file, errp);
     if (offset < 0) {
         ret = offset;
         goto fail;
@@ -599,7 +600,7 @@ static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num)
         case 0x80000005: { /* zlib compressed */
             /* we need to buffer, because only the chunk as whole can be
              * inflated. */
-            ret = bdrv_pread(bs->file->bs, s->offsets[chunk],
+            ret = bdrv_pread(bs->file, s->offsets[chunk],
                              s->compressed_chunk, s->lengths[chunk]);
             if (ret != s->lengths[chunk]) {
                 return -1;
@@ -623,7 +624,7 @@ static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num)
         case 0x80000006: /* bzip2 compressed */
             /* we need to buffer, because only the chunk as whole can be
              * inflated. */
-            ret = bdrv_pread(bs->file->bs, s->offsets[chunk],
+            ret = bdrv_pread(bs->file, s->offsets[chunk],
                              s->compressed_chunk, s->lengths[chunk]);
             if (ret != s->lengths[chunk]) {
                 return -1;
@@ -648,7 +649,7 @@ static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num)
             break;
 #endif /* CONFIG_BZIP2 */
         case 1: /* copy */
-            ret = bdrv_pread(bs->file->bs, s->offsets[chunk],
+            ret = bdrv_pread(bs->file, s->offsets[chunk],
                              s->uncompressed_chunk, s->lengths[chunk]);
             if (ret != s->lengths[chunk]) {
                 return -1;
diff --git a/block/io.c b/block/io.c
index 2e04a80..1240cc5 100644
--- a/block/io.c
+++ b/block/io.c
@@ -709,11 +709,11 @@ int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags)
     }
 }
 
-int bdrv_preadv(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov)
+int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov)
 {
     int ret;
 
-    ret = bdrv_prwv_co(bs, offset, qiov, false, 0);
+    ret = bdrv_prwv_co(child->bs, offset, qiov, false, 0);
     if (ret < 0) {
         return ret;
     }
@@ -721,7 +721,7 @@ int bdrv_preadv(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov)
     return qiov->size;
 }
 
-int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes)
+int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes)
 {
     QEMUIOVector qiov;
     struct iovec iov = {
@@ -734,7 +734,7 @@ int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes)
     }
 
     qemu_iovec_init_external(&qiov, &iov, 1);
-    return bdrv_preadv(bs, offset, &qiov);
+    return bdrv_preadv(child, offset, &qiov);
 }
 
 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov)
diff --git a/block/parallels.c b/block/parallels.c
index 91ab61f..85c7cdc 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -576,7 +576,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
     Error *local_err = NULL;
     char *buf;
 
-    ret = bdrv_pread(bs->file->bs, 0, &ph, sizeof(ph));
+    ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
     if (ret < 0) {
         goto fail;
     }
@@ -631,7 +631,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
         s->header_size = size;
     }
 
-    ret = bdrv_pread(bs->file->bs, 0, s->header, s->header_size);
+    ret = bdrv_pread(bs->file, 0, s->header, s->header_size);
     if (ret < 0) {
         goto fail;
     }
diff --git a/block/qcow.c b/block/qcow.c
index 674595e..55ffccb 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -105,7 +105,7 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
     int ret;
     QCowHeader header;
 
-    ret = bdrv_pread(bs->file->bs, 0, &header, sizeof(header));
+    ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
     if (ret < 0) {
         goto fail;
     }
@@ -208,7 +208,7 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
-    ret = bdrv_pread(bs->file->bs, s->l1_table_offset, s->l1_table,
+    ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table,
                s->l1_size * sizeof(uint64_t));
     if (ret < 0) {
         goto fail;
@@ -239,7 +239,7 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
             ret = -EINVAL;
             goto fail;
         }
-        ret = bdrv_pread(bs->file->bs, header.backing_file_offset,
+        ret = bdrv_pread(bs->file, header.backing_file_offset,
                    bs->backing_file, len);
         if (ret < 0) {
             goto fail;
@@ -424,7 +424,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
                 s->l2_size * sizeof(uint64_t)) < 0)
             return 0;
     } else {
-        if (bdrv_pread(bs->file->bs, l2_offset, l2_table,
+        if (bdrv_pread(bs->file, l2_offset, l2_table,
                        s->l2_size * sizeof(uint64_t)) !=
             s->l2_size * sizeof(uint64_t))
             return 0;
@@ -565,7 +565,7 @@ static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset)
     if (s->cluster_cache_offset != coffset) {
         csize = cluster_offset >> (63 - s->cluster_bits);
         csize &= (s->cluster_size - 1);
-        ret = bdrv_pread(bs->file->bs, coffset, s->cluster_data, csize);
+        ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize);
         if (ret != csize)
             return -1;
         if (decompress_buffer(s->cluster_cache, s->cluster_size,
diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index 580631c..5eba75f 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -357,7 +357,7 @@ static int qcow2_cache_do_get(BlockDriverState *bs, Qcow2Cache *c,
             BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD);
         }
 
-        ret = bdrv_pread(bs->file->bs, offset,
+        ret = bdrv_pread(bs->file, offset,
                          qcow2_cache_get_table_addr(bs, c, i),
                          s->cluster_size);
         if (ret < 0) {
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 12e7e6b..e541974 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -104,7 +104,7 @@ int qcow2_refcount_init(BlockDriverState *bs)
             goto fail;
         }
         BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_LOAD);
-        ret = bdrv_pread(bs->file->bs, s->refcount_table_offset,
+        ret = bdrv_pread(bs->file, s->refcount_table_offset,
                          s->refcount_table, refcount_table_size2);
         if (ret < 0) {
             goto fail;
@@ -1070,7 +1070,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
         }
         l1_allocated = true;
 
-        ret = bdrv_pread(bs->file->bs, l1_table_offset, l1_table, l1_size2);
+        ret = bdrv_pread(bs->file, l1_table_offset, l1_table, l1_size2);
         if (ret < 0) {
             goto fail;
         }
@@ -1382,7 +1382,7 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
     l2_size = s->l2_size * sizeof(uint64_t);
     l2_table = g_malloc(l2_size);
 
-    ret = bdrv_pread(bs->file->bs, l2_offset, l2_table, l2_size);
+    ret = bdrv_pread(bs->file, l2_offset, l2_table, l2_size);
     if (ret < 0) {
         fprintf(stderr, "ERROR: I/O error in check_refcounts_l2\n");
         res->check_errors++;
@@ -1514,7 +1514,7 @@ static int check_refcounts_l1(BlockDriverState *bs,
             res->check_errors++;
             goto fail;
         }
-        ret = bdrv_pread(bs->file->bs, l1_table_offset, l1_table, l1_size2);
+        ret = bdrv_pread(bs->file, l1_table_offset, l1_table, l1_size2);
         if (ret < 0) {
             fprintf(stderr, "ERROR: I/O error in check_refcounts_l1\n");
             res->check_errors++;
@@ -1612,7 +1612,7 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
             }
         }
 
-        ret = bdrv_pread(bs->file->bs, l2_offset, l2_table,
+        ret = bdrv_pread(bs->file, l2_offset, l2_table,
                          s->l2_size * sizeof(uint64_t));
         if (ret < 0) {
             fprintf(stderr, "ERROR: Could not read L2 table: %s\n",
@@ -2407,7 +2407,7 @@ int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
                 return -ENOMEM;
             }
 
-            ret = bdrv_pread(bs->file->bs, l1_ofs, l1, l1_sz2);
+            ret = bdrv_pread(bs->file, l1_ofs, l1, l1_sz2);
             if (ret < 0) {
                 g_free(l1);
                 return ret;
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 242fb21..2693ebf 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -67,7 +67,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
     for(i = 0; i < s->nb_snapshots; i++) {
         /* Read statically sized part of the snapshot header */
         offset = align_offset(offset, 8);
-        ret = bdrv_pread(bs->file->bs, offset, &h, sizeof(h));
+        ret = bdrv_pread(bs->file, offset, &h, sizeof(h));
         if (ret < 0) {
             goto fail;
         }
@@ -86,7 +86,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
         name_size = be16_to_cpu(h.name_size);
 
         /* Read extra data */
-        ret = bdrv_pread(bs->file->bs, offset, &extra,
+        ret = bdrv_pread(bs->file, offset, &extra,
                          MIN(sizeof(extra), extra_data_size));
         if (ret < 0) {
             goto fail;
@@ -105,7 +105,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
 
         /* Read snapshot ID */
         sn->id_str = g_malloc(id_str_size + 1);
-        ret = bdrv_pread(bs->file->bs, offset, sn->id_str, id_str_size);
+        ret = bdrv_pread(bs->file, offset, sn->id_str, id_str_size);
         if (ret < 0) {
             goto fail;
         }
@@ -114,7 +114,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
 
         /* Read snapshot name */
         sn->name = g_malloc(name_size + 1);
-        ret = bdrv_pread(bs->file->bs, offset, sn->name, name_size);
+        ret = bdrv_pread(bs->file, offset, sn->name, name_size);
         if (ret < 0) {
             goto fail;
         }
@@ -512,7 +512,7 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
         goto fail;
     }
 
-    ret = bdrv_pread(bs->file->bs, sn->l1_table_offset,
+    ret = bdrv_pread(bs->file, sn->l1_table_offset,
                      sn_l1_table, sn_l1_bytes);
     if (ret < 0) {
         goto fail;
@@ -716,7 +716,7 @@ int qcow2_snapshot_load_tmp(BlockDriverState *bs,
         return -ENOMEM;
     }
 
-    ret = bdrv_pread(bs->file->bs, sn->l1_table_offset,
+    ret = bdrv_pread(bs->file, sn->l1_table_offset,
                      new_l1_table, new_l1_bytes);
     if (ret < 0) {
         error_setg(errp, "Failed to read l1 table for snapshot");
diff --git a/block/qcow2.c b/block/qcow2.c
index cd9c27b..b7313d2 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -107,7 +107,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
         printf("attempting to read extended header in offset %lu\n", offset);
 #endif
 
-        ret = bdrv_pread(bs->file->bs, offset, &ext, sizeof(ext));
+        ret = bdrv_pread(bs->file, offset, &ext, sizeof(ext));
         if (ret < 0) {
             error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: "
                              "pread fail from offset %" PRIu64, offset);
@@ -135,7 +135,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
                            sizeof(bs->backing_format));
                 return 2;
             }
-            ret = bdrv_pread(bs->file->bs, offset, bs->backing_format, ext.len);
+            ret = bdrv_pread(bs->file, offset, bs->backing_format, ext.len);
             if (ret < 0) {
                 error_setg_errno(errp, -ret, "ERROR: ext_backing_format: "
                                  "Could not read format name");
@@ -151,7 +151,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
         case QCOW2_EXT_MAGIC_FEATURE_TABLE:
             if (p_feature_table != NULL) {
                 void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature));
-                ret = bdrv_pread(bs->file->bs, offset , feature_table, ext.len);
+                ret = bdrv_pread(bs->file, offset , feature_table, ext.len);
                 if (ret < 0) {
                     error_setg_errno(errp, -ret, "ERROR: ext_feature_table: "
                                      "Could not read table");
@@ -172,7 +172,7 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
                 uext->len = ext.len;
                 QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next);
 
-                ret = bdrv_pread(bs->file->bs, offset , uext->data, uext->len);
+                ret = bdrv_pread(bs->file, offset , uext->data, uext->len);
                 if (ret < 0) {
                     error_setg_errno(errp, -ret, "ERROR: unknown extension: "
                                      "Could not read data");
@@ -817,7 +817,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
     uint64_t ext_end;
     uint64_t l1_vm_state_index;
 
-    ret = bdrv_pread(bs->file->bs, 0, &header, sizeof(header));
+    ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Could not read qcow2 header");
         goto fail;
@@ -892,7 +892,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
     if (header.header_length > sizeof(header)) {
         s->unknown_header_fields_size = header.header_length - sizeof(header);
         s->unknown_header_fields = g_malloc(s->unknown_header_fields_size);
-        ret = bdrv_pread(bs->file->bs, sizeof(header), s->unknown_header_fields,
+        ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields,
                          s->unknown_header_fields_size);
         if (ret < 0) {
             error_setg_errno(errp, -ret, "Could not read unknown qcow2 header "
@@ -1066,7 +1066,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
             ret = -ENOMEM;
             goto fail;
         }
-        ret = bdrv_pread(bs->file->bs, s->l1_table_offset, s->l1_table,
+        ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table,
                          s->l1_size * sizeof(uint64_t));
         if (ret < 0) {
             error_setg_errno(errp, -ret, "Could not read L1 table");
@@ -1122,7 +1122,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
             ret = -EINVAL;
             goto fail;
         }
-        ret = bdrv_pread(bs->file->bs, header.backing_file_offset,
+        ret = bdrv_pread(bs->file, header.backing_file_offset,
                          bs->backing_file, len);
         if (ret < 0) {
             error_setg_errno(errp, -ret, "Could not read backing file name");
diff --git a/block/qed.c b/block/qed.c
index 9d3d588..d6d5e33 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -218,7 +218,7 @@ static bool qed_is_image_size_valid(uint64_t image_size, uint32_t cluster_size,
  *
  * The string is NUL-terminated.
  */
-static int qed_read_string(BlockDriverState *file, uint64_t offset, size_t n,
+static int qed_read_string(BdrvChild *file, uint64_t offset, size_t n,
                            char *buf, size_t buflen)
 {
     int ret;
@@ -389,7 +389,7 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
     s->bs = bs;
     QSIMPLEQ_INIT(&s->allocating_write_reqs);
 
-    ret = bdrv_pread(bs->file->bs, 0, &le_header, sizeof(le_header));
+    ret = bdrv_pread(bs->file, 0, &le_header, sizeof(le_header));
     if (ret < 0) {
         return ret;
     }
@@ -446,7 +446,7 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
             return -EINVAL;
         }
 
-        ret = qed_read_string(bs->file->bs, s->header.backing_filename_offset,
+        ret = qed_read_string(bs->file, s->header.backing_filename_offset,
                               s->header.backing_filename_size, bs->backing_file,
                               sizeof(bs->backing_file));
         if (ret < 0) {
diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index 8ab7d22..1e3928f 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -84,7 +84,7 @@ static int vhdx_log_peek_hdr(BlockDriverState *bs, VHDXLogEntries *log,
 
     offset = log->offset + read;
 
-    ret = bdrv_pread(bs->file->bs, offset, hdr, sizeof(VHDXLogEntryHeader));
+    ret = bdrv_pread(bs->file, offset, hdr, sizeof(VHDXLogEntryHeader));
     if (ret < 0) {
         goto exit;
     }
@@ -144,7 +144,7 @@ static int vhdx_log_read_sectors(BlockDriverState *bs, VHDXLogEntries *log,
         }
         offset = log->offset + read;
 
-        ret = bdrv_pread(bs->file->bs, offset, buffer, VHDX_LOG_SECTOR_SIZE);
+        ret = bdrv_pread(bs->file, offset, buffer, VHDX_LOG_SECTOR_SIZE);
         if (ret < 0) {
             goto exit;
         }
@@ -945,7 +945,7 @@ static int vhdx_log_write(BlockDriverState *bs, BDRVVHDXState *s,
 
         if (i == 0 && leading_length) {
             /* partial sector at the front of the buffer */
-            ret = bdrv_pread(bs->file->bs, file_offset, merged_sector,
+            ret = bdrv_pread(bs->file, file_offset, merged_sector,
                              VHDX_LOG_SECTOR_SIZE);
             if (ret < 0) {
                 goto exit;
@@ -955,7 +955,7 @@ static int vhdx_log_write(BlockDriverState *bs, BDRVVHDXState *s,
             sector_write = merged_sector;
         } else if (i == sectors - 1 && trailing_length) {
             /* partial sector at the end of the buffer */
-            ret = bdrv_pread(bs->file->bs,
+            ret = bdrv_pread(bs->file,
                             file_offset,
                             merged_sector + trailing_length,
                             VHDX_LOG_SECTOR_SIZE - trailing_length);
diff --git a/block/vhdx.c b/block/vhdx.c
index b0f66de..c5ec608 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -298,9 +298,10 @@ static int vhdx_probe(const uint8_t *buf, int buf_size, const char *filename)
  * and then update the header checksum.  Header is converted to proper
  * endianness before being written to the specified file offset
  */
-static int vhdx_write_header(BlockDriverState *bs_file, VHDXHeader *hdr,
+static int vhdx_write_header(BdrvChild *file, VHDXHeader *hdr,
                              uint64_t offset, bool read)
 {
+    BlockDriverState *bs_file = file->bs;
     uint8_t *buffer = NULL;
     int ret;
     VHDXHeader *header_le;
@@ -315,7 +316,7 @@ static int vhdx_write_header(BlockDriverState *bs_file, VHDXHeader *hdr,
     buffer = qemu_blockalign(bs_file, VHDX_HEADER_SIZE);
     if (read) {
         /* if true, we can't assume the extra reserved bytes are 0 */
-        ret = bdrv_pread(bs_file, offset, buffer, VHDX_HEADER_SIZE);
+        ret = bdrv_pread(file, offset, buffer, VHDX_HEADER_SIZE);
         if (ret < 0) {
             goto exit;
         }
@@ -378,7 +379,7 @@ static int vhdx_update_header(BlockDriverState *bs, BDRVVHDXState *s,
         inactive_header->log_guid = *log_guid;
     }
 
-    ret = vhdx_write_header(bs->file->bs, inactive_header, header_offset, true);
+    ret = vhdx_write_header(bs->file, inactive_header, header_offset, true);
     if (ret < 0) {
         goto exit;
     }
@@ -430,7 +431,7 @@ static void vhdx_parse_header(BlockDriverState *bs, BDRVVHDXState *s,
     /* We have to read the whole VHDX_HEADER_SIZE instead of
      * sizeof(VHDXHeader), because the checksum is over the whole
      * region */
-    ret = bdrv_pread(bs->file->bs, VHDX_HEADER1_OFFSET, buffer,
+    ret = bdrv_pread(bs->file, VHDX_HEADER1_OFFSET, buffer,
                      VHDX_HEADER_SIZE);
     if (ret < 0) {
         goto fail;
@@ -447,7 +448,7 @@ static void vhdx_parse_header(BlockDriverState *bs, BDRVVHDXState *s,
         }
     }
 
-    ret = bdrv_pread(bs->file->bs, VHDX_HEADER2_OFFSET, buffer,
+    ret = bdrv_pread(bs->file, VHDX_HEADER2_OFFSET, buffer,
                      VHDX_HEADER_SIZE);
     if (ret < 0) {
         goto fail;
@@ -521,7 +522,7 @@ static int vhdx_open_region_tables(BlockDriverState *bs, BDRVVHDXState *s)
      * whole block */
     buffer = qemu_blockalign(bs, VHDX_HEADER_BLOCK_SIZE);
 
-    ret = bdrv_pread(bs->file->bs, VHDX_REGION_TABLE_OFFSET, buffer,
+    ret = bdrv_pread(bs->file, VHDX_REGION_TABLE_OFFSET, buffer,
                      VHDX_HEADER_BLOCK_SIZE);
     if (ret < 0) {
         goto fail;
@@ -634,7 +635,7 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
 
     buffer = qemu_blockalign(bs, VHDX_METADATA_TABLE_MAX_SIZE);
 
-    ret = bdrv_pread(bs->file->bs, s->metadata_rt.file_offset, buffer,
+    ret = bdrv_pread(bs->file, s->metadata_rt.file_offset, buffer,
                      VHDX_METADATA_TABLE_MAX_SIZE);
     if (ret < 0) {
         goto exit;
@@ -737,7 +738,7 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
         goto exit;
     }
 
-    ret = bdrv_pread(bs->file->bs,
+    ret = bdrv_pread(bs->file,
                      s->metadata_entries.file_parameters_entry.offset
                                          + s->metadata_rt.file_offset,
                      &s->params,
@@ -772,7 +773,7 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
     /* determine virtual disk size, logical sector size,
      * and phys sector size */
 
-    ret = bdrv_pread(bs->file->bs,
+    ret = bdrv_pread(bs->file,
                      s->metadata_entries.virtual_disk_size_entry.offset
                                            + s->metadata_rt.file_offset,
                      &s->virtual_disk_size,
@@ -780,7 +781,7 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
     if (ret < 0) {
         goto exit;
     }
-    ret = bdrv_pread(bs->file->bs,
+    ret = bdrv_pread(bs->file,
                      s->metadata_entries.logical_sector_size_entry.offset
                                              + s->metadata_rt.file_offset,
                      &s->logical_sector_size,
@@ -788,7 +789,7 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
     if (ret < 0) {
         goto exit;
     }
-    ret = bdrv_pread(bs->file->bs,
+    ret = bdrv_pread(bs->file,
                      s->metadata_entries.phys_sector_size_entry.offset
                                           + s->metadata_rt.file_offset,
                      &s->physical_sector_size,
@@ -905,7 +906,7 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
     QLIST_INIT(&s->regions);
 
     /* validate the file signature */
-    ret = bdrv_pread(bs->file->bs, 0, &signature, sizeof(uint64_t));
+    ret = bdrv_pread(bs->file, 0, &signature, sizeof(uint64_t));
     if (ret < 0) {
         goto fail;
     }
@@ -964,7 +965,7 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
-    ret = bdrv_pread(bs->file->bs, s->bat_offset, s->bat, s->bat_rt.length);
+    ret = bdrv_pread(bs->file, s->bat_offset, s->bat, s->bat_rt.length);
     if (ret < 0) {
         goto fail;
     }
@@ -1391,6 +1392,7 @@ static int vhdx_create_new_headers(BlockBackend *blk, uint64_t image_size,
                                    uint32_t log_size)
 {
     BlockDriverState *bs = blk_bs(blk);
+    BdrvChild *child;
     int ret = 0;
     VHDXHeader *hdr = NULL;
 
@@ -1405,12 +1407,18 @@ static int vhdx_create_new_headers(BlockBackend *blk, uint64_t image_size,
     vhdx_guid_generate(&hdr->file_write_guid);
     vhdx_guid_generate(&hdr->data_write_guid);
 
-    ret = vhdx_write_header(bs, hdr, VHDX_HEADER1_OFFSET, false);
+    /* XXX Ugly way to get blk->root, but that's a feature, not a bug. This
+     * hack makes it obvious that vhdx_write_header() bypasses the BlockBackend
+     * here, which it really shouldn't be doing. */
+    child = QLIST_FIRST(&bs->parents);
+    assert(!QLIST_NEXT(child, next_parent));
+
+    ret = vhdx_write_header(child, hdr, VHDX_HEADER1_OFFSET, false);
     if (ret < 0) {
         goto exit;
     }
     hdr->sequence_number++;
-    ret = vhdx_write_header(bs, hdr, VHDX_HEADER2_OFFSET, false);
+    ret = vhdx_write_header(child, hdr, VHDX_HEADER2_OFFSET, false);
     if (ret < 0) {
         goto exit;
     }
diff --git a/block/vmdk.c b/block/vmdk.c
index 2901692..a2c85a2 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -252,7 +252,7 @@ static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent)
     int ret;
 
     desc = g_malloc0(DESC_SIZE);
-    ret = bdrv_pread(bs->file->bs, s->desc_offset, desc, DESC_SIZE);
+    ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
     if (ret < 0) {
         g_free(desc);
         return 0;
@@ -286,7 +286,7 @@ static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
 
     desc = g_malloc0(DESC_SIZE);
     tmp_desc = g_malloc0(DESC_SIZE);
-    ret = bdrv_pread(bs->file->bs, s->desc_offset, desc, DESC_SIZE);
+    ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
     if (ret < 0) {
         goto out;
     }
@@ -350,7 +350,7 @@ static int vmdk_parent_open(BlockDriverState *bs)
     int ret;
 
     desc = g_malloc0(DESC_SIZE + 1);
-    ret = bdrv_pread(bs->file->bs, s->desc_offset, desc, DESC_SIZE);
+    ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE);
     if (ret < 0) {
         goto out;
     }
@@ -454,7 +454,7 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
         return -ENOMEM;
     }
 
-    ret = bdrv_pread(extent->file->bs,
+    ret = bdrv_pread(extent->file,
                      extent->l1_table_offset,
                      extent->l1_table,
                      l1_size);
@@ -474,7 +474,7 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
             ret = -ENOMEM;
             goto fail_l1;
         }
-        ret = bdrv_pread(extent->file->bs,
+        ret = bdrv_pread(extent->file,
                          extent->l1_backup_table_offset,
                          extent->l1_backup_table,
                          l1_size);
@@ -508,7 +508,7 @@ static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
     VMDK3Header header;
     VmdkExtent *extent;
 
-    ret = bdrv_pread(file->bs, sizeof(magic), &header, sizeof(header));
+    ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
     if (ret < 0) {
         error_setg_errno(errp, -ret,
                          "Could not read header from file '%s'",
@@ -538,14 +538,13 @@ static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf,
                                QDict *options, Error **errp);
 
-static char *vmdk_read_desc(BlockDriverState *file, uint64_t desc_offset,
-                            Error **errp)
+static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp)
 {
     int64_t size;
     char *buf;
     int ret;
 
-    size = bdrv_getlength(file);
+    size = bdrv_getlength(file->bs);
     if (size < 0) {
         error_setg_errno(errp, -size, "Could not access file");
         return NULL;
@@ -586,7 +585,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
     int64_t l1_backup_offset = 0;
     bool compressed;
 
-    ret = bdrv_pread(file->bs, sizeof(magic), &header, sizeof(header));
+    ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
     if (ret < 0) {
         error_setg_errno(errp, -ret,
                          "Could not read header from file '%s'",
@@ -596,7 +595,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
     if (header.capacity == 0) {
         uint64_t desc_offset = le64_to_cpu(header.desc_offset);
         if (desc_offset) {
-            char *buf = vmdk_read_desc(file->bs, desc_offset << 9, errp);
+            char *buf = vmdk_read_desc(file, desc_offset << 9, errp);
             if (!buf) {
                 return -EINVAL;
             }
@@ -636,7 +635,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
             } QEMU_PACKED eos_marker;
         } QEMU_PACKED footer;
 
-        ret = bdrv_pread(file->bs,
+        ret = bdrv_pread(file,
             bs->file->bs->total_sectors * 512 - 1536,
             &footer, sizeof(footer));
         if (ret < 0) {
@@ -874,7 +873,7 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
             extent->flat_start_offset = flat_offset << 9;
         } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) {
             /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/
-            char *buf = vmdk_read_desc(extent_file->bs, 0, errp);
+            char *buf = vmdk_read_desc(extent_file, 0, errp);
             if (!buf) {
                 ret = -EINVAL;
             } else {
@@ -943,7 +942,7 @@ static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
     BDRVVmdkState *s = bs->opaque;
     uint32_t magic;
 
-    buf = vmdk_read_desc(bs->file->bs, 0, errp);
+    buf = vmdk_read_desc(bs->file, 0, errp);
     if (!buf) {
         return -EINVAL;
     }
@@ -1046,7 +1045,7 @@ static int get_whole_cluster(BlockDriverState *bs,
     /* Read backing data before skip range */
     if (skip_start_bytes > 0) {
         if (bs->backing) {
-            ret = bdrv_pread(bs->backing->bs, offset, whole_grain,
+            ret = bdrv_pread(bs->backing, offset, whole_grain,
                              skip_start_bytes);
             if (ret < 0) {
                 ret = VMDK_ERROR;
@@ -1063,7 +1062,7 @@ static int get_whole_cluster(BlockDriverState *bs,
     /* Read backing data after skip range */
     if (skip_end_bytes < cluster_bytes) {
         if (bs->backing) {
-            ret = bdrv_pread(bs->backing->bs, offset + skip_end_bytes,
+            ret = bdrv_pread(bs->backing, offset + skip_end_bytes,
                              whole_grain + skip_end_bytes,
                              cluster_bytes - skip_end_bytes);
             if (ret < 0) {
@@ -1191,8 +1190,7 @@ static int get_cluster_offset(BlockDriverState *bs,
         }
     }
     l2_table = extent->l2_cache + (min_index * extent->l2_size);
-    if (bdrv_pread(
-                extent->file->bs,
+    if (bdrv_pread(extent->file,
                 (int64_t)l2_offset * 512,
                 l2_table,
                 extent->l2_size * sizeof(uint32_t)
@@ -1424,7 +1422,7 @@ static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
     buf_bytes = cluster_bytes * 2;
     cluster_buf = g_malloc(buf_bytes);
     uncomp_buf = g_malloc(cluster_bytes);
-    ret = bdrv_pread(extent->file->bs,
+    ret = bdrv_pread(extent->file,
                 cluster_offset,
                 cluster_buf, buf_bytes);
     if (ret < 0) {
diff --git a/block/vpc.c b/block/vpc.c
index 076a7ce..9528637 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -237,7 +237,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
-    ret = bdrv_pread(bs->file->bs, 0, s->footer_buf, HEADER_SIZE);
+    ret = bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE);
     if (ret < 0) {
         error_setg(errp, "Unable to read VHD header");
         goto fail;
@@ -257,7 +257,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
         }
 
         /* If a fixed disk, the footer is found only at the end of the file */
-        ret = bdrv_pread(bs->file->bs, offset-HEADER_SIZE, s->footer_buf,
+        ret = bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf,
                          HEADER_SIZE);
         if (ret < 0) {
             goto fail;
@@ -328,7 +328,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     if (disk_type == VHD_DYNAMIC) {
-        ret = bdrv_pread(bs->file->bs, be64_to_cpu(footer->data_offset), buf,
+        ret = bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
                          HEADER_SIZE);
         if (ret < 0) {
             error_setg(errp, "Error reading dynamic VHD header");
@@ -385,7 +385,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
 
         s->bat_offset = be64_to_cpu(dyndisk_header->table_offset);
 
-        ret = bdrv_pread(bs->file->bs, s->bat_offset, s->pagetable,
+        ret = bdrv_pread(bs->file, s->bat_offset, s->pagetable,
                          pagetable_size);
         if (ret < 0) {
             error_setg(errp, "Error reading pagetable");
diff --git a/include/block/block.h b/include/block/block.h
index ea17936..4b1d090 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -233,9 +233,8 @@ int bdrv_write(BdrvChild *child, int64_t sector_num,
 int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
                        int count, BdrvRequestFlags flags);
 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
-int bdrv_pread(BlockDriverState *bs, int64_t offset,
-               void *buf, int count);
-int bdrv_preadv(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
+int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes);
+int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                 const void *buf, int count);
 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
-- 
1.8.3.1

[Qemu-devel] [PULL 39/43] block: Convert bdrv_pwrite(v/_sync) to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/io.c             | 17 ++++++++---------
 block/parallels.c      |  6 +++---
 block/qcow.c           | 14 +++++++-------
 block/qcow2-cache.c    |  2 +-
 block/qcow2-cluster.c  |  6 +++---
 block/qcow2-refcount.c | 22 +++++++++++-----------
 block/qcow2-snapshot.c | 14 +++++++-------
 block/qcow2.c          | 14 +++++++-------
 block/qed.c            |  4 ++--
 block/vdi.c            |  2 +-
 block/vhdx-log.c       |  4 ++--
 block/vhdx.c           |  2 +-
 block/vmdk.c           | 12 +++++-------
 block/vpc.c            |  8 ++++----
 include/block/block.h  |  9 ++++-----
 15 files changed, 66 insertions(+), 70 deletions(-)

diff --git a/block/io.c b/block/io.c
index 1240cc5..7f86c06 100644
--- a/block/io.c
+++ b/block/io.c
@@ -737,11 +737,11 @@ int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes)
     return bdrv_preadv(child, offset, &qiov);
 }
 
-int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov)
+int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov)
 {
     int ret;
 
-    ret = bdrv_prwv_co(bs, offset, qiov, true, 0);
+    ret = bdrv_prwv_co(child->bs, offset, qiov, true, 0);
     if (ret < 0) {
         return ret;
     }
@@ -749,8 +749,7 @@ int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov)
     return qiov->size;
 }
 
-int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
-                const void *buf, int bytes)
+int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes)
 {
     QEMUIOVector qiov;
     struct iovec iov = {
@@ -763,7 +762,7 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
     }
 
     qemu_iovec_init_external(&qiov, &iov, 1);
-    return bdrv_pwritev(bs, offset, &qiov);
+    return bdrv_pwritev(child, offset, &qiov);
 }
 
 /*
@@ -772,17 +771,17 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
  *
  * Returns 0 on success, -errno in error cases.
  */
-int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
-    const void *buf, int count)
+int bdrv_pwrite_sync(BdrvChild *child, int64_t offset,
+                     const void *buf, int count)
 {
     int ret;
 
-    ret = bdrv_pwrite(bs, offset, buf, count);
+    ret = bdrv_pwrite(child, offset, buf, count);
     if (ret < 0) {
         return ret;
     }
 
-    ret = bdrv_flush(bs);
+    ret = bdrv_flush(child->bs);
     if (ret < 0) {
         return ret;
     }
diff --git a/block/parallels.c b/block/parallels.c
index 85c7cdc..4542eb8 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -250,7 +250,7 @@ static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
         if (off + to_write > s->header_size) {
             to_write = s->header_size - off;
         }
-        ret = bdrv_pwrite(bs->file->bs, off, (uint8_t *)s->header + off,
+        ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off,
                           to_write);
         if (ret < 0) {
             qemu_co_mutex_unlock(&s->lock);
@@ -432,7 +432,7 @@ static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
     }
 
     if (flush_bat) {
-        ret = bdrv_pwrite_sync(bs->file->bs, 0, s->header, s->header_size);
+        ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
         if (ret < 0) {
             res->check_errors++;
             return ret;
@@ -563,7 +563,7 @@ static int parallels_update_header(BlockDriverState *bs)
     if (size > s->header_size) {
         size = s->header_size;
     }
-    return bdrv_pwrite_sync(bs->file->bs, 0, s->header, size);
+    return bdrv_pwrite_sync(bs->file, 0, s->header, size);
 }
 
 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
diff --git a/block/qcow.c b/block/qcow.c
index 55ffccb..ac849bd 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -390,7 +390,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
         /* update the L1 entry */
         s->l1_table[l1_index] = l2_offset;
         tmp = cpu_to_be64(l2_offset);
-        if (bdrv_pwrite_sync(bs->file->bs,
+        if (bdrv_pwrite_sync(bs->file,
                 s->l1_table_offset + l1_index * sizeof(tmp),
                 &tmp, sizeof(tmp)) < 0)
             return 0;
@@ -420,7 +420,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
     l2_table = s->l2_cache + (min_index << s->l2_bits);
     if (new_l2_table) {
         memset(l2_table, 0, s->l2_size * sizeof(uint64_t));
-        if (bdrv_pwrite_sync(bs->file->bs, l2_offset, l2_table,
+        if (bdrv_pwrite_sync(bs->file, l2_offset, l2_table,
                 s->l2_size * sizeof(uint64_t)) < 0)
             return 0;
     } else {
@@ -450,7 +450,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
             cluster_offset = (cluster_offset + s->cluster_size - 1) &
                 ~(s->cluster_size - 1);
             /* write the cluster content */
-            if (bdrv_pwrite(bs->file->bs, cluster_offset, s->cluster_cache,
+            if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache,
                             s->cluster_size) !=
                 s->cluster_size)
                 return -1;
@@ -480,7 +480,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
                                 errno = EIO;
                                 return -1;
                             }
-                            if (bdrv_pwrite(bs->file->bs,
+                            if (bdrv_pwrite(bs->file,
                                             cluster_offset + i * 512,
                                             s->cluster_data, 512) != 512)
                                 return -1;
@@ -495,7 +495,7 @@ static uint64_t get_cluster_offset(BlockDriverState *bs,
         /* update L2 table */
         tmp = cpu_to_be64(cluster_offset);
         l2_table[l2_index] = tmp;
-        if (bdrv_pwrite_sync(bs->file->bs, l2_offset + l2_index * sizeof(tmp),
+        if (bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp),
                 &tmp, sizeof(tmp)) < 0)
             return 0;
     }
@@ -899,7 +899,7 @@ static int qcow_make_empty(BlockDriverState *bs)
     int ret;
 
     memset(s->l1_table, 0, l1_length);
-    if (bdrv_pwrite_sync(bs->file->bs, s->l1_table_offset, s->l1_table,
+    if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table,
             l1_length) < 0)
         return -1;
     ret = bdrv_truncate(bs->file->bs, s->l1_table_offset + l1_length);
@@ -1025,7 +1025,7 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
         }
 
         cluster_offset &= s->cluster_offset_mask;
-        ret = bdrv_pwrite(bs->file->bs, cluster_offset, out_buf, out_len);
+        ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len);
         if (ret < 0) {
             goto fail;
         }
diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index 5eba75f..6eaefed 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -210,7 +210,7 @@ static int qcow2_cache_entry_flush(BlockDriverState *bs, Qcow2Cache *c, int i)
         BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE);
     }
 
-    ret = bdrv_pwrite(bs->file->bs, c->entries[i].offset,
+    ret = bdrv_pwrite(bs->file, c->entries[i].offset,
                       qcow2_cache_get_table_addr(bs, c, i), s->cluster_size);
     if (ret < 0) {
         return ret;
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index a2490d7..0cd7fdf 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -108,7 +108,7 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
     BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_WRITE_TABLE);
     for(i = 0; i < s->l1_size; i++)
         new_l1_table[i] = cpu_to_be64(new_l1_table[i]);
-    ret = bdrv_pwrite_sync(bs->file->bs, new_l1_table_offset,
+    ret = bdrv_pwrite_sync(bs->file, new_l1_table_offset,
                            new_l1_table, new_l1_size2);
     if (ret < 0)
         goto fail;
@@ -119,7 +119,7 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
     BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_ACTIVATE_TABLE);
     cpu_to_be32w((uint32_t*)data, new_l1_size);
     stq_be_p(data + 4, new_l1_table_offset);
-    ret = bdrv_pwrite_sync(bs->file->bs, offsetof(QCowHeader, l1_size),
+    ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_size),
                            data, sizeof(data));
     if (ret < 0) {
         goto fail;
@@ -185,7 +185,7 @@ int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index)
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE);
-    ret = bdrv_pwrite_sync(bs->file->bs,
+    ret = bdrv_pwrite_sync(bs->file,
                            s->l1_table_offset + 8 * l1_start_index,
                            buf, sizeof(buf));
     if (ret < 0) {
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index e541974..13bbc9c 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -431,7 +431,7 @@ static int alloc_refcount_block(BlockDriverState *bs,
     if (refcount_table_index < s->refcount_table_size) {
         uint64_t data64 = cpu_to_be64(new_block);
         BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_HOOKUP);
-        ret = bdrv_pwrite_sync(bs->file->bs,
+        ret = bdrv_pwrite_sync(bs->file,
             s->refcount_table_offset + refcount_table_index * sizeof(uint64_t),
             &data64, sizeof(data64));
         if (ret < 0) {
@@ -533,7 +533,7 @@ static int alloc_refcount_block(BlockDriverState *bs,
 
     /* Write refcount blocks to disk */
     BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS);
-    ret = bdrv_pwrite_sync(bs->file->bs, meta_offset, new_blocks,
+    ret = bdrv_pwrite_sync(bs->file, meta_offset, new_blocks,
         blocks_clusters * s->cluster_size);
     g_free(new_blocks);
     new_blocks = NULL;
@@ -547,7 +547,7 @@ static int alloc_refcount_block(BlockDriverState *bs,
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE);
-    ret = bdrv_pwrite_sync(bs->file->bs, table_offset, new_table,
+    ret = bdrv_pwrite_sync(bs->file, table_offset, new_table,
         table_size * sizeof(uint64_t));
     if (ret < 0) {
         goto fail_table;
@@ -565,7 +565,7 @@ static int alloc_refcount_block(BlockDriverState *bs,
     cpu_to_be64w(&data.d64, table_offset);
     cpu_to_be32w(&data.d32, table_clusters);
     BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE);
-    ret = bdrv_pwrite_sync(bs->file->bs,
+    ret = bdrv_pwrite_sync(bs->file,
                            offsetof(QCowHeader, refcount_table_offset),
                            &data, sizeof(data));
     if (ret < 0) {
@@ -1223,7 +1223,7 @@ fail:
             cpu_to_be64s(&l1_table[i]);
         }
 
-        ret = bdrv_pwrite_sync(bs->file->bs, l1_table_offset,
+        ret = bdrv_pwrite_sync(bs->file, l1_table_offset,
                                l1_table, l1_size2);
 
         for (i = 0; i < l1_size; i++) {
@@ -1664,7 +1664,7 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
                 goto fail;
             }
 
-            ret = bdrv_pwrite(bs->file->bs, l2_offset, l2_table,
+            ret = bdrv_pwrite(bs->file, l2_offset, l2_table,
                               s->cluster_size);
             if (ret < 0) {
                 fprintf(stderr, "ERROR: Could not write L2 table: %s\n",
@@ -2147,7 +2147,7 @@ write_refblocks:
     }
 
     assert(reftable_size < INT_MAX / sizeof(uint64_t));
-    ret = bdrv_pwrite(bs->file->bs, reftable_offset, on_disk_reftable,
+    ret = bdrv_pwrite(bs->file, reftable_offset, on_disk_reftable,
                       reftable_size * sizeof(uint64_t));
     if (ret < 0) {
         fprintf(stderr, "ERROR writing reftable: %s\n", strerror(-ret));
@@ -2159,8 +2159,8 @@ write_refblocks:
                  reftable_offset);
     cpu_to_be32w(&reftable_offset_and_clusters.reftable_clusters,
                  size_to_clusters(s, reftable_size * sizeof(uint64_t)));
-    ret = bdrv_pwrite_sync(bs->file->bs, offsetof(QCowHeader,
-                                                  refcount_table_offset),
+    ret = bdrv_pwrite_sync(bs->file,
+                           offsetof(QCowHeader, refcount_table_offset),
                            &reftable_offset_and_clusters,
                            sizeof(reftable_offset_and_clusters));
     if (ret < 0) {
@@ -2560,7 +2560,7 @@ static int flush_refblock(BlockDriverState *bs, uint64_t **reftable,
             return ret;
         }
 
-        ret = bdrv_pwrite(bs->file->bs, offset, refblock, s->cluster_size);
+        ret = bdrv_pwrite(bs->file, offset, refblock, s->cluster_size);
         if (ret < 0) {
             error_setg_errno(errp, -ret, "Failed to write refblock");
             return ret;
@@ -2830,7 +2830,7 @@ int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
         cpu_to_be64s(&new_reftable[i]);
     }
 
-    ret = bdrv_pwrite(bs->file->bs, new_reftable_offset, new_reftable,
+    ret = bdrv_pwrite(bs->file, new_reftable_offset, new_reftable,
                       new_reftable_size * sizeof(uint64_t));
 
     for (i = 0; i < new_reftable_size; i++) {
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 2693ebf..0324243 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -217,25 +217,25 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
         h.name_size = cpu_to_be16(name_size);
         offset = align_offset(offset, 8);
 
-        ret = bdrv_pwrite(bs->file->bs, offset, &h, sizeof(h));
+        ret = bdrv_pwrite(bs->file, offset, &h, sizeof(h));
         if (ret < 0) {
             goto fail;
         }
         offset += sizeof(h);
 
-        ret = bdrv_pwrite(bs->file->bs, offset, &extra, sizeof(extra));
+        ret = bdrv_pwrite(bs->file, offset, &extra, sizeof(extra));
         if (ret < 0) {
             goto fail;
         }
         offset += sizeof(extra);
 
-        ret = bdrv_pwrite(bs->file->bs, offset, sn->id_str, id_str_size);
+        ret = bdrv_pwrite(bs->file, offset, sn->id_str, id_str_size);
         if (ret < 0) {
             goto fail;
         }
         offset += id_str_size;
 
-        ret = bdrv_pwrite(bs->file->bs, offset, sn->name, name_size);
+        ret = bdrv_pwrite(bs->file, offset, sn->name, name_size);
         if (ret < 0) {
             goto fail;
         }
@@ -257,7 +257,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
     header_data.nb_snapshots        = cpu_to_be32(s->nb_snapshots);
     header_data.snapshots_offset    = cpu_to_be64(snapshots_offset);
 
-    ret = bdrv_pwrite_sync(bs->file->bs, offsetof(QCowHeader, nb_snapshots),
+    ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, nb_snapshots),
                            &header_data, sizeof(header_data));
     if (ret < 0) {
         goto fail;
@@ -399,7 +399,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
         goto fail;
     }
 
-    ret = bdrv_pwrite(bs->file->bs, sn->l1_table_offset, l1_table,
+    ret = bdrv_pwrite(bs->file, sn->l1_table_offset, l1_table,
                       s->l1_size * sizeof(uint64_t));
     if (ret < 0) {
         goto fail;
@@ -530,7 +530,7 @@ int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
         goto fail;
     }
 
-    ret = bdrv_pwrite_sync(bs->file->bs, s->l1_table_offset, sn_l1_table,
+    ret = bdrv_pwrite_sync(bs->file, s->l1_table_offset, sn_l1_table,
                            cur_l1_bytes);
     if (ret < 0) {
         goto fail;
diff --git a/block/qcow2.c b/block/qcow2.c
index b7313d2..090dc6d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -249,7 +249,7 @@ int qcow2_mark_dirty(BlockDriverState *bs)
     }
 
     val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY);
-    ret = bdrv_pwrite(bs->file->bs, offsetof(QCowHeader, incompatible_features),
+    ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features),
                       &val, sizeof(val));
     if (ret < 0) {
         return ret;
@@ -1976,7 +1976,7 @@ int qcow2_update_header(BlockDriverState *bs)
     }
 
     /* Write the new header */
-    ret = bdrv_pwrite(bs->file->bs, 0, header, s->cluster_size);
+    ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size);
     if (ret < 0) {
         goto fail;
     }
@@ -2059,7 +2059,7 @@ static int preallocate(BlockDriverState *bs)
      */
     if (host_offset != 0) {
         uint8_t data = 0;
-        ret = bdrv_pwrite(bs->file->bs, (host_offset + cur_bytes) - 1,
+        ret = bdrv_pwrite(bs->file, (host_offset + cur_bytes) - 1,
                           &data, 1);
         if (ret < 0) {
             return ret;
@@ -2523,7 +2523,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
 
     /* write updated header.size */
     offset = cpu_to_be64(offset);
-    ret = bdrv_pwrite_sync(bs->file->bs, offsetof(QCowHeader, size),
+    ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size),
                            &offset, sizeof(uint64_t));
     if (ret < 0) {
         return ret;
@@ -2660,7 +2660,7 @@ static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num,
         }
 
         BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED);
-        ret = bdrv_pwrite(bs->file->bs, cluster_offset, out_buf, out_len);
+        ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len);
         if (ret < 0) {
             goto fail;
         }
@@ -2742,7 +2742,7 @@ static int make_completely_empty(BlockDriverState *bs)
     cpu_to_be64w(&l1_ofs_rt_ofs_cls.l1_offset, 3 * s->cluster_size);
     cpu_to_be64w(&l1_ofs_rt_ofs_cls.reftable_offset, s->cluster_size);
     cpu_to_be32w(&l1_ofs_rt_ofs_cls.reftable_clusters, 1);
-    ret = bdrv_pwrite_sync(bs->file->bs, offsetof(QCowHeader, l1_table_offset),
+    ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_table_offset),
                            &l1_ofs_rt_ofs_cls, sizeof(l1_ofs_rt_ofs_cls));
     if (ret < 0) {
         goto fail_broken_refcounts;
@@ -2773,7 +2773,7 @@ static int make_completely_empty(BlockDriverState *bs)
 
     /* Enter the first refblock into the reftable */
     rt_entry = cpu_to_be64(2 * s->cluster_size);
-    ret = bdrv_pwrite_sync(bs->file->bs, s->cluster_size,
+    ret = bdrv_pwrite_sync(bs->file, s->cluster_size,
                            &rt_entry, sizeof(rt_entry));
     if (ret < 0) {
         goto fail_broken_refcounts;
diff --git a/block/qed.c b/block/qed.c
index d6d5e33..f619d82 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -86,7 +86,7 @@ int qed_write_header_sync(BDRVQEDState *s)
     int ret;
 
     qed_header_cpu_to_le(&s->header, &le);
-    ret = bdrv_pwrite(s->bs->file->bs, 0, &le, sizeof(le));
+    ret = bdrv_pwrite(s->bs->file, 0, &le, sizeof(le));
     if (ret != sizeof(le)) {
         return ret;
     }
@@ -1575,7 +1575,7 @@ static int bdrv_qed_change_backing_file(BlockDriverState *bs,
     }
 
     /* Write new header */
-    ret = bdrv_pwrite_sync(bs->file->bs, 0, buffer, buffer_len);
+    ret = bdrv_pwrite_sync(bs->file, 0, buffer, buffer_len);
     g_free(buffer);
     if (ret == 0) {
         memcpy(&s->header, &new_header, sizeof(new_header));
diff --git a/block/vdi.c b/block/vdi.c
index b2871ca..a1a12d9 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -670,7 +670,7 @@ vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
              * acquire the lock and thus the padded cluster is written before
              * the other coroutines can write to the affected area. */
             qemu_co_mutex_lock(&s->write_lock);
-            ret = bdrv_pwrite(bs->file->bs, data_offset, block, s->block_size);
+            ret = bdrv_pwrite(bs->file, data_offset, block, s->block_size);
             qemu_co_mutex_unlock(&s->write_lock);
         } else {
             uint64_t data_offset = s->header.offset_data +
diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index 1e3928f..02eb104 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -194,7 +194,7 @@ static int vhdx_log_write_sectors(BlockDriverState *bs, VHDXLogEntries *log,
             /* full */
             break;
         }
-        ret = bdrv_pwrite(bs->file->bs, offset, buffer_tmp,
+        ret = bdrv_pwrite(bs->file, offset, buffer_tmp,
                           VHDX_LOG_SECTOR_SIZE);
         if (ret < 0) {
             goto exit;
@@ -466,7 +466,7 @@ static int vhdx_log_flush_desc(BlockDriverState *bs, VHDXLogDescriptor *desc,
 
     /* count is only > 1 if we are writing zeroes */
     for (i = 0; i < count; i++) {
-        ret = bdrv_pwrite_sync(bs->file->bs, file_offset, buffer,
+        ret = bdrv_pwrite_sync(bs->file, file_offset, buffer,
                                VHDX_LOG_SECTOR_SIZE);
         if (ret < 0) {
             goto exit;
diff --git a/block/vhdx.c b/block/vhdx.c
index c5ec608..75ef2b1 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -330,7 +330,7 @@ static int vhdx_write_header(BdrvChild *file, VHDXHeader *hdr,
     vhdx_header_le_export(hdr, header_le);
     vhdx_update_checksum(buffer, VHDX_HEADER_SIZE,
                          offsetof(VHDXHeader, checksum));
-    ret = bdrv_pwrite_sync(bs_file, offset, header_le, sizeof(VHDXHeader));
+    ret = bdrv_pwrite_sync(file, offset, header_le, sizeof(VHDXHeader));
 
 exit:
     qemu_vfree(buffer);
diff --git a/block/vmdk.c b/block/vmdk.c
index a2c85a2..ae70b63 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -306,7 +306,7 @@ static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid)
         pstrcat(desc, DESC_SIZE, tmp_desc);
     }
 
-    ret = bdrv_pwrite_sync(bs->file->bs, s->desc_offset, desc, DESC_SIZE);
+    ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE);
 
 out:
     g_free(desc);
@@ -1052,7 +1052,7 @@ static int get_whole_cluster(BlockDriverState *bs,
                 goto exit;
             }
         }
-        ret = bdrv_pwrite(extent->file->bs, cluster_offset, whole_grain,
+        ret = bdrv_pwrite(extent->file, cluster_offset, whole_grain,
                           skip_start_bytes);
         if (ret < 0) {
             ret = VMDK_ERROR;
@@ -1070,7 +1070,7 @@ static int get_whole_cluster(BlockDriverState *bs,
                 goto exit;
             }
         }
-        ret = bdrv_pwrite(extent->file->bs, cluster_offset + skip_end_bytes,
+        ret = bdrv_pwrite(extent->file, cluster_offset + skip_end_bytes,
                           whole_grain + skip_end_bytes,
                           cluster_bytes - skip_end_bytes);
         if (ret < 0) {
@@ -1090,8 +1090,7 @@ static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
 {
     offset = cpu_to_le32(offset);
     /* update L2 table */
-    if (bdrv_pwrite_sync(
-                extent->file->bs,
+    if (bdrv_pwrite_sync(extent->file,
                 ((int64_t)m_data->l2_offset * 512)
                     + (m_data->l2_index * sizeof(offset)),
                 &offset, sizeof(offset)) < 0) {
@@ -1100,8 +1099,7 @@ static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
     /* update backup L2 table */
     if (extent->l1_backup_table_offset != 0) {
         m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
-        if (bdrv_pwrite_sync(
-                    extent->file->bs,
+        if (bdrv_pwrite_sync(extent->file,
                     ((int64_t)m_data->l2_offset * 512)
                         + (m_data->l2_index * sizeof(offset)),
                     &offset, sizeof(offset)) < 0) {
diff --git a/block/vpc.c b/block/vpc.c
index 9528637..dcb5312 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -481,7 +481,7 @@ static inline int64_t get_image_offset(BlockDriverState *bs, uint64_t offset,
 
         s->last_bitmap_offset = bitmap_offset;
         memset(bitmap, 0xff, s->bitmap_size);
-        bdrv_pwrite_sync(bs->file->bs, bitmap_offset, bitmap, s->bitmap_size);
+        bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size);
     }
 
     return block_offset;
@@ -505,7 +505,7 @@ static int rewrite_footer(BlockDriverState* bs)
     BDRVVPCState *s = bs->opaque;
     int64_t offset = s->free_data_block_offset;
 
-    ret = bdrv_pwrite_sync(bs->file->bs, offset, s->footer_buf, HEADER_SIZE);
+    ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE);
     if (ret < 0)
         return ret;
 
@@ -539,7 +539,7 @@ static int64_t alloc_block(BlockDriverState* bs, int64_t offset)
 
     /* Initialize the block's bitmap */
     memset(bitmap, 0xff, s->bitmap_size);
-    ret = bdrv_pwrite_sync(bs->file->bs, s->free_data_block_offset, bitmap,
+    ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap,
         s->bitmap_size);
     if (ret < 0) {
         return ret;
@@ -554,7 +554,7 @@ static int64_t alloc_block(BlockDriverState* bs, int64_t offset)
     /* Write BAT entry to disk */
     bat_offset = s->bat_offset + (4 * index);
     bat_value = cpu_to_be32(s->pagetable[index]);
-    ret = bdrv_pwrite_sync(bs->file->bs, bat_offset, &bat_value, 4);
+    ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
     if (ret < 0)
         goto fail;
 
diff --git a/include/block/block.h b/include/block/block.h
index 4b1d090..59fd20b 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -235,11 +235,10 @@ int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes);
 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
-int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
-                const void *buf, int count);
-int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
-int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
-    const void *buf, int count);
+int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes);
+int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
+int bdrv_pwrite_sync(BdrvChild *child, int64_t offset,
+                     const void *buf, int count);
 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
                                int nb_sectors, QEMUIOVector *qiov);
 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
-- 
1.8.3.1

[Qemu-devel] [PULL 40/43] block: Convert bdrv_pwrite_zeroes() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/block-backend.c          | 5 +++++
 block/io.c                     | 9 +++++----
 block/parallels.c              | 2 +-
 block/qcow2-cluster.c          | 2 +-
 block/qcow2.c                  | 4 ++--
 include/block/block.h          | 4 ++--
 include/sysemu/block-backend.h | 1 +
 qemu-img.c                     | 2 +-
 8 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index e042544..4bc7265 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -870,6 +870,11 @@ int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                    flags | BDRV_REQ_ZERO_WRITE);
 }
 
+int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
+{
+    return bdrv_make_zero(blk->root, flags);
+}
+
 static void error_callback_bh(void *opaque)
 {
     struct BlockBackendAIOCB *acb = opaque;
diff --git a/block/io.c b/block/io.c
index 7f86c06..4e6e1c4 100644
--- a/block/io.c
+++ b/block/io.c
@@ -649,7 +649,7 @@ int bdrv_write(BdrvChild *child, int64_t sector_num,
                       true, 0);
 }
 
-int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
+int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
                        int count, BdrvRequestFlags flags)
 {
     QEMUIOVector qiov;
@@ -659,7 +659,7 @@ int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
     };
 
     qemu_iovec_init_external(&qiov, &iov, 1);
-    return bdrv_prwv_co(bs, offset, &qiov, true,
+    return bdrv_prwv_co(child->bs, offset, &qiov, true,
                         BDRV_REQ_ZERO_WRITE | flags);
 }
 
@@ -672,9 +672,10 @@ int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
  *
  * Returns < 0 on error, 0 on success. For error codes see bdrv_write().
  */
-int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags)
+int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags)
 {
     int64_t target_sectors, ret, nb_sectors, sector_num = 0;
+    BlockDriverState *bs = child->bs;
     BlockDriverState *file;
     int n;
 
@@ -698,7 +699,7 @@ int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags)
             sector_num += n;
             continue;
         }
-        ret = bdrv_pwrite_zeroes(bs, sector_num << BDRV_SECTOR_BITS,
+        ret = bdrv_pwrite_zeroes(child, sector_num << BDRV_SECTOR_BITS,
                                  n << BDRV_SECTOR_BITS, flags);
         if (ret < 0) {
             error_report("error writing zeroes at sector %" PRId64 ": %s",
diff --git a/block/parallels.c b/block/parallels.c
index 4542eb8..807a801 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -210,7 +210,7 @@ static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
         int ret;
         space += s->prealloc_size;
         if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
-            ret = bdrv_pwrite_zeroes(bs->file->bs,
+            ret = bdrv_pwrite_zeroes(bs->file,
                                      s->data_end << BDRV_SECTOR_BITS,
                                      space << BDRV_SECTOR_BITS, 0);
         } else {
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 0cd7fdf..6a3ad90 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1752,7 +1752,7 @@ static int expand_zero_clusters_in_l1(BlockDriverState *bs, uint64_t *l1_table,
                 goto fail;
             }
 
-            ret = bdrv_pwrite_zeroes(bs->file->bs, offset, s->cluster_size, 0);
+            ret = bdrv_pwrite_zeroes(bs->file, offset, s->cluster_size, 0);
             if (ret < 0) {
                 if (!preallocated) {
                     qcow2_free_clusters(bs, offset, s->cluster_size,
diff --git a/block/qcow2.c b/block/qcow2.c
index 090dc6d..a289c12 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2709,7 +2709,7 @@ static int make_completely_empty(BlockDriverState *bs)
     /* After this call, neither the in-memory nor the on-disk refcount
      * information accurately describe the actual references */
 
-    ret = bdrv_pwrite_zeroes(bs->file->bs, s->l1_table_offset,
+    ret = bdrv_pwrite_zeroes(bs->file, s->l1_table_offset,
                              l1_clusters * s->cluster_size, 0);
     if (ret < 0) {
         goto fail_broken_refcounts;
@@ -2723,7 +2723,7 @@ static int make_completely_empty(BlockDriverState *bs)
      * overwrite parts of the existing refcount and L1 table, which is not
      * an issue because the dirty flag is set, complete data loss is in fact
      * desired and partial data loss is consequently fine as well */
-    ret = bdrv_pwrite_zeroes(bs->file->bs, s->cluster_size,
+    ret = bdrv_pwrite_zeroes(bs->file, s->cluster_size,
                              (2 + l1_clusters) * s->cluster_size, 0);
     /* This call (even if it failed overall) may have overwritten on-disk
      * refcount structures; in that case, the in-memory refcount information
diff --git a/include/block/block.h b/include/block/block.h
index 59fd20b..4eaa1c1 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -230,9 +230,9 @@ int bdrv_read(BdrvChild *child, int64_t sector_num,
               uint8_t *buf, int nb_sectors);
 int bdrv_write(BdrvChild *child, int64_t sector_num,
                const uint8_t *buf, int nb_sectors);
-int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
+int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
                        int count, BdrvRequestFlags flags);
-int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
+int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags);
 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes);
 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
 int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes);
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 2469a1c..3c3e82f 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -124,6 +124,7 @@ int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
 BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                                   int count, BdrvRequestFlags flags,
                                   BlockCompletionFunc *cb, void *opaque);
+int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags);
 int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count);
 int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count,
                BdrvRequestFlags flags);
diff --git a/qemu-img.c b/qemu-img.c
index 3a7c162..2e04e28 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1648,7 +1648,7 @@ static int convert_do_copy(ImgConvertState *s)
     if (!s->has_zero_init && !s->target_has_backing &&
         bdrv_can_write_zeroes_with_unmap(blk_bs(s->target)))
     {
-        ret = bdrv_make_zero(blk_bs(s->target), BDRV_REQ_MAY_UNMAP);
+        ret = blk_make_zero(s->target, BDRV_REQ_MAY_UNMAP);
         if (ret == 0) {
             s->has_zero_init = true;
         }
-- 
1.8.3.1

[Qemu-devel] [PULL 41/43] block: Convert bdrv_prwv_co() to BdrvChild

[Kevin Wolf]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/io.c | 45 +++++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/block/io.c b/block/io.c
index 4e6e1c4..f702efc 100644
--- a/block/io.c
+++ b/block/io.c
@@ -553,7 +553,7 @@ static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
 }
 
 typedef struct RwCo {
-    BlockDriverState *bs;
+    BdrvChild *child;
     int64_t offset;
     QEMUIOVector *qiov;
     bool is_write;
@@ -566,11 +566,11 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
     RwCo *rwco = opaque;
 
     if (!rwco->is_write) {
-        rwco->ret = bdrv_co_preadv(rwco->bs, rwco->offset,
+        rwco->ret = bdrv_co_preadv(rwco->child->bs, rwco->offset,
                                    rwco->qiov->size, rwco->qiov,
                                    rwco->flags);
     } else {
-        rwco->ret = bdrv_co_pwritev(rwco->bs, rwco->offset,
+        rwco->ret = bdrv_co_pwritev(rwco->child->bs, rwco->offset,
                                     rwco->qiov->size, rwco->qiov,
                                     rwco->flags);
     }
@@ -579,13 +579,13 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
 /*
  * Process a vectored synchronous request using coroutines
  */
-static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset,
+static int bdrv_prwv_co(BdrvChild *child, int64_t offset,
                         QEMUIOVector *qiov, bool is_write,
                         BdrvRequestFlags flags)
 {
     Coroutine *co;
     RwCo rwco = {
-        .bs = bs,
+        .child = child,
         .offset = offset,
         .qiov = qiov,
         .is_write = is_write,
@@ -597,7 +597,7 @@ static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset,
         /* Fast-path if already in coroutine context */
         bdrv_rw_co_entry(&rwco);
     } else {
-        AioContext *aio_context = bdrv_get_aio_context(bs);
+        AioContext *aio_context = bdrv_get_aio_context(child->bs);
 
         co = qemu_coroutine_create(bdrv_rw_co_entry);
         qemu_coroutine_enter(co, &rwco);
@@ -611,7 +611,7 @@ static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset,
 /*
  * Process a synchronous request using coroutines
  */
-static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
+static int bdrv_rw_co(BdrvChild *child, int64_t sector_num, uint8_t *buf,
                       int nb_sectors, bool is_write, BdrvRequestFlags flags)
 {
     QEMUIOVector qiov;
@@ -625,7 +625,7 @@ static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
     }
 
     qemu_iovec_init_external(&qiov, &iov, 1);
-    return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS,
+    return bdrv_prwv_co(child, sector_num << BDRV_SECTOR_BITS,
                         &qiov, is_write, flags);
 }
 
@@ -633,7 +633,7 @@ static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
 int bdrv_read(BdrvChild *child, int64_t sector_num,
               uint8_t *buf, int nb_sectors)
 {
-    return bdrv_rw_co(child->bs, sector_num, buf, nb_sectors, false, 0);
+    return bdrv_rw_co(child, sector_num, buf, nb_sectors, false, 0);
 }
 
 /* Return < 0 if error. Important errors are:
@@ -645,8 +645,7 @@ int bdrv_read(BdrvChild *child, int64_t sector_num,
 int bdrv_write(BdrvChild *child, int64_t sector_num,
                const uint8_t *buf, int nb_sectors)
 {
-    return bdrv_rw_co(child->bs, sector_num, (uint8_t *)buf, nb_sectors,
-                      true, 0);
+    return bdrv_rw_co(child, sector_num, (uint8_t *)buf, nb_sectors, true, 0);
 }
 
 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
@@ -659,7 +658,7 @@ int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
     };
 
     qemu_iovec_init_external(&qiov, &iov, 1);
-    return bdrv_prwv_co(child->bs, offset, &qiov, true,
+    return bdrv_prwv_co(child, offset, &qiov, true,
                         BDRV_REQ_ZERO_WRITE | flags);
 }
 
@@ -714,7 +713,7 @@ int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov)
 {
     int ret;
 
-    ret = bdrv_prwv_co(child->bs, offset, qiov, false, 0);
+    ret = bdrv_prwv_co(child, offset, qiov, false, 0);
     if (ret < 0) {
         return ret;
     }
@@ -742,7 +741,7 @@ int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov)
 {
     int ret;
 
-    ret = bdrv_prwv_co(child->bs, offset, qiov, true, 0);
+    ret = bdrv_prwv_co(child, offset, qiov, true, 0);
     if (ret < 0) {
         return ret;
     }
@@ -2210,9 +2209,15 @@ void qemu_aio_unref(void *p)
 /**************************************************************/
 /* Coroutine block device emulation */
 
+typedef struct FlushCo {
+    BlockDriverState *bs;
+    int ret;
+} FlushCo;
+
+
 static void coroutine_fn bdrv_flush_co_entry(void *opaque)
 {
-    RwCo *rwco = opaque;
+    FlushCo *rwco = opaque;
 
     rwco->ret = bdrv_co_flush(rwco->bs);
 }
@@ -2296,25 +2301,25 @@ out:
 int bdrv_flush(BlockDriverState *bs)
 {
     Coroutine *co;
-    RwCo rwco = {
+    FlushCo flush_co = {
         .bs = bs,
         .ret = NOT_DONE,
     };
 
     if (qemu_in_coroutine()) {
         /* Fast-path if already in coroutine context */
-        bdrv_flush_co_entry(&rwco);
+        bdrv_flush_co_entry(&flush_co);
     } else {
         AioContext *aio_context = bdrv_get_aio_context(bs);
 
         co = qemu_coroutine_create(bdrv_flush_co_entry);
-        qemu_coroutine_enter(co, &rwco);
-        while (rwco.ret == NOT_DONE) {
+        qemu_coroutine_enter(co, &flush_co);
+        while (flush_co.ret == NOT_DONE) {
             aio_poll(aio_context, true);
         }
     }
 
-    return rwco.ret;
+    return flush_co.ret;
 }
 
 typedef struct DiscardCo {
-- 
1.8.3.1

[Qemu-devel] [PULL 42/43] block: Convert bdrv_co_preadv/pwritev to BdrvChild

[Kevin Wolf]

This is the final patch for converting the common I/O path to take
a BdrvChild parameter instead of BlockDriverState.

The completion of this conversion means that all users that perform I/O
on an image need to actually hold a reference (in the form of BdrvChild,
possible as part of a BlockBackend) to that image. This also protects
against inconsistent use of BlockBackend vs. BlockDriverState functions
because direct use of a BlockDriverState isn't possible any more and
blk->root is private for block-backends.c.

In addition, we can now distinguish different users in the I/O path,
and the future op blockers work is going to add assertions based on
permissions stored in BdrvChild.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/blkreplay.c         |  6 +++---
 block/block-backend.c     |  4 ++--
 block/bochs.c             |  2 +-
 block/io.c                | 25 +++++++++++++------------
 block/qcow2-cluster.c     |  2 +-
 block/qcow2.c             |  6 +++---
 block/raw_bsd.c           |  4 ++--
 block/vdi.c               |  4 ++--
 block/vmdk.c              |  6 +++---
 block/vpc.c               |  8 ++++----
 include/block/block.h     |  4 ++--
 include/block/block_int.h |  4 ++--
 12 files changed, 38 insertions(+), 37 deletions(-)

diff --git a/block/blkreplay.c b/block/blkreplay.c
index 196b8d0..70650e4 100755
--- a/block/blkreplay.c
+++ b/block/blkreplay.c
@@ -85,7 +85,7 @@ static int coroutine_fn blkreplay_co_preadv(BlockDriverState *bs,
     uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
 {
     uint64_t reqid = request_id++;
-    int ret = bdrv_co_preadv(bs->file->bs, offset, bytes, qiov, flags);
+    int ret = bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
     block_request_create(reqid, bs, qemu_coroutine_self());
     qemu_coroutine_yield();
 
@@ -96,7 +96,7 @@ static int coroutine_fn blkreplay_co_pwritev(BlockDriverState *bs,
     uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
 {
     uint64_t reqid = request_id++;
-    int ret = bdrv_co_pwritev(bs->file->bs, offset, bytes, qiov, flags);
+    int ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
     block_request_create(reqid, bs, qemu_coroutine_self());
     qemu_coroutine_yield();
 
@@ -107,7 +107,7 @@ static int coroutine_fn blkreplay_co_pwrite_zeroes(BlockDriverState *bs,
     int64_t offset, int count, BdrvRequestFlags flags)
 {
     uint64_t reqid = request_id++;
-    int ret = bdrv_co_pwrite_zeroes(bs->file->bs, offset, count, flags);
+    int ret = bdrv_co_pwrite_zeroes(bs->file, offset, count, flags);
     block_request_create(reqid, bs, qemu_coroutine_self());
     qemu_coroutine_yield();
 
diff --git a/block/block-backend.c b/block/block-backend.c
index 4bc7265..a862f65 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -760,7 +760,7 @@ int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
         throttle_group_co_io_limits_intercept(blk, bytes, false);
     }
 
-    return bdrv_co_preadv(blk_bs(blk), offset, bytes, qiov, flags);
+    return bdrv_co_preadv(blk->root, offset, bytes, qiov, flags);
 }
 
 int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
@@ -785,7 +785,7 @@ int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
         flags |= BDRV_REQ_FUA;
     }
 
-    return bdrv_co_pwritev(blk_bs(blk), offset, bytes, qiov, flags);
+    return bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags);
 }
 
 typedef struct BlkRwCo {
diff --git a/block/bochs.c b/block/bochs.c
index 46f635f..8c9652e 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -255,7 +255,7 @@ bochs_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
         qemu_iovec_concat(&local_qiov, qiov, bytes_done, 512);
 
         if (block_offset > 0) {
-            ret = bdrv_co_preadv(bs->file->bs, block_offset, 512,
+            ret = bdrv_co_preadv(bs->file, block_offset, 512,
                                  &local_qiov, 0);
             if (ret < 0) {
                 goto fail;
diff --git a/block/io.c b/block/io.c
index f702efc..7086908 100644
--- a/block/io.c
+++ b/block/io.c
@@ -566,11 +566,11 @@ static void coroutine_fn bdrv_rw_co_entry(void *opaque)
     RwCo *rwco = opaque;
 
     if (!rwco->is_write) {
-        rwco->ret = bdrv_co_preadv(rwco->child->bs, rwco->offset,
+        rwco->ret = bdrv_co_preadv(rwco->child, rwco->offset,
                                    rwco->qiov->size, rwco->qiov,
                                    rwco->flags);
     } else {
-        rwco->ret = bdrv_co_pwritev(rwco->child->bs, rwco->offset,
+        rwco->ret = bdrv_co_pwritev(rwco->child, rwco->offset,
                                     rwco->qiov->size, rwco->qiov,
                                     rwco->flags);
     }
@@ -1061,10 +1061,11 @@ out:
 /*
  * Handle a read request in coroutine context
  */
-int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
+int coroutine_fn bdrv_co_preadv(BdrvChild *child,
     int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
     BdrvRequestFlags flags)
 {
+    BlockDriverState *bs = child->bs;
     BlockDriver *drv = bs->drv;
     BdrvTrackedRequest req;
 
@@ -1137,7 +1138,7 @@ static int coroutine_fn bdrv_co_do_readv(BdrvChild *child,
         return -EINVAL;
     }
 
-    return bdrv_co_preadv(child->bs, sector_num << BDRV_SECTOR_BITS,
+    return bdrv_co_preadv(child, sector_num << BDRV_SECTOR_BITS,
                           nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
@@ -1406,10 +1407,11 @@ fail:
 /*
  * Handle a write request in coroutine context
  */
-int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
+int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
     int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
     BdrvRequestFlags flags)
 {
+    BlockDriverState *bs = child->bs;
     BdrvTrackedRequest req;
     uint64_t align = bs->bl.request_alignment;
     uint8_t *head_buf = NULL;
@@ -1543,7 +1545,7 @@ static int coroutine_fn bdrv_co_do_writev(BdrvChild *child,
         return -EINVAL;
     }
 
-    return bdrv_co_pwritev(child->bs, sector_num << BDRV_SECTOR_BITS,
+    return bdrv_co_pwritev(child, sector_num << BDRV_SECTOR_BITS,
                            nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
 }
 
@@ -1555,17 +1557,16 @@ int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
     return bdrv_co_do_writev(child, sector_num, nb_sectors, qiov, 0);
 }
 
-int coroutine_fn bdrv_co_pwrite_zeroes(BlockDriverState *bs,
-                                       int64_t offset, int count,
-                                       BdrvRequestFlags flags)
+int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset,
+                                       int count, BdrvRequestFlags flags)
 {
-    trace_bdrv_co_pwrite_zeroes(bs, offset, count, flags);
+    trace_bdrv_co_pwrite_zeroes(child->bs, offset, count, flags);
 
-    if (!(bs->open_flags & BDRV_O_UNMAP)) {
+    if (!(child->bs->open_flags & BDRV_O_UNMAP)) {
         flags &= ~BDRV_REQ_MAY_UNMAP;
     }
 
-    return bdrv_co_pwritev(bs, offset, count, NULL,
+    return bdrv_co_pwritev(child, offset, count, NULL,
                            BDRV_REQ_ZERO_WRITE | flags);
 }
 
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 6a3ad90..cf159f1 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -446,7 +446,7 @@ static int coroutine_fn do_perform_cow(BlockDriverState *bs,
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_COW_WRITE);
-    ret = bdrv_co_pwritev(bs->file->bs, cluster_offset + offset_in_cluster,
+    ret = bdrv_co_pwritev(bs->file, cluster_offset + offset_in_cluster,
                           bytes, &qiov, 0);
     if (ret < 0) {
         goto out;
diff --git a/block/qcow2.c b/block/qcow2.c
index a289c12..8a2c568 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1443,7 +1443,7 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
 
                     BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO);
                     qemu_co_mutex_unlock(&s->lock);
-                    ret = bdrv_co_preadv(bs->backing->bs, offset, n1,
+                    ret = bdrv_co_preadv(bs->backing, offset, n1,
                                          &local_qiov, 0);
                     qemu_co_mutex_lock(&s->lock);
 
@@ -1506,7 +1506,7 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset,
 
             BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
             qemu_co_mutex_unlock(&s->lock);
-            ret = bdrv_co_preadv(bs->file->bs,
+            ret = bdrv_co_preadv(bs->file,
                                  cluster_offset + offset_in_cluster,
                                  cur_bytes, &hd_qiov, 0);
             qemu_co_mutex_lock(&s->lock);
@@ -1637,7 +1637,7 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
         BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
         trace_qcow2_writev_data(qemu_coroutine_self(),
                                 cluster_offset + offset_in_cluster);
-        ret = bdrv_co_pwritev(bs->file->bs,
+        ret = bdrv_co_pwritev(bs->file,
                               cluster_offset + offset_in_cluster,
                               cur_bytes, &hd_qiov, 0);
         qemu_co_mutex_lock(&s->lock);
diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index 90b296e..5f9dd29 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -105,7 +105,7 @@ raw_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
-    ret = bdrv_co_pwritev(bs->file->bs, sector_num * BDRV_SECTOR_SIZE,
+    ret = bdrv_co_pwritev(bs->file, sector_num * BDRV_SECTOR_SIZE,
                           nb_sectors * BDRV_SECTOR_SIZE, qiov, flags);
 
 fail:
@@ -131,7 +131,7 @@ static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
                                              int64_t offset, int count,
                                              BdrvRequestFlags flags)
 {
-    return bdrv_co_pwrite_zeroes(bs->file->bs, offset, count, flags);
+    return bdrv_co_pwrite_zeroes(bs->file, offset, count, flags);
 }
 
 static int coroutine_fn raw_co_discard(BlockDriverState *bs,
diff --git a/block/vdi.c b/block/vdi.c
index a1a12d9..8a1cf97 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -597,7 +597,7 @@ vdi_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
             qemu_iovec_reset(&local_qiov);
             qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
 
-            ret = bdrv_co_preadv(bs->file->bs, data_offset, n_bytes,
+            ret = bdrv_co_preadv(bs->file, data_offset, n_bytes,
                                  &local_qiov, 0);
         }
         logout("%u bytes read\n", n_bytes);
@@ -690,7 +690,7 @@ vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
             qemu_iovec_reset(&local_qiov);
             qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
 
-            ret = bdrv_co_pwritev(bs->file->bs, data_offset, n_bytes,
+            ret = bdrv_co_pwritev(bs->file, data_offset, n_bytes,
                                   &local_qiov, 0);
         }
 
diff --git a/block/vmdk.c b/block/vmdk.c
index ae70b63..d73f431 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1369,7 +1369,7 @@ static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset,
     }
 
     write_offset = cluster_offset + offset_in_cluster,
-    ret = bdrv_co_pwritev(extent->file->bs, write_offset, n_bytes,
+    ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes,
                           &local_qiov, 0);
 
     write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE);
@@ -1407,7 +1407,7 @@ static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
 
 
     if (!extent->compressed) {
-        ret = bdrv_co_preadv(extent->file->bs,
+        ret = bdrv_co_preadv(extent->file,
                              cluster_offset + offset_in_cluster, bytes,
                              qiov, 0);
         if (ret < 0) {
@@ -1497,7 +1497,7 @@ vmdk_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
                 qemu_iovec_reset(&local_qiov);
                 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
 
-                ret = bdrv_co_preadv(bs->backing->bs, offset, n_bytes,
+                ret = bdrv_co_preadv(bs->backing, offset, n_bytes,
                                      &local_qiov, 0);
                 if (ret < 0) {
                     goto fail;
diff --git a/block/vpc.c b/block/vpc.c
index dcb5312..43707ed 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -591,7 +591,7 @@ vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
     QEMUIOVector local_qiov;
 
     if (be32_to_cpu(footer->type) == VHD_FIXED) {
-        return bdrv_co_preadv(bs->file->bs, offset, bytes, qiov, 0);
+        return bdrv_co_preadv(bs->file, offset, bytes, qiov, 0);
     }
 
     qemu_co_mutex_lock(&s->lock);
@@ -607,7 +607,7 @@ vpc_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
             qemu_iovec_reset(&local_qiov);
             qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
 
-            ret = bdrv_co_preadv(bs->file->bs, image_offset, n_bytes,
+            ret = bdrv_co_preadv(bs->file, image_offset, n_bytes,
                                  &local_qiov, 0);
             if (ret < 0) {
                 goto fail;
@@ -640,7 +640,7 @@ vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
     QEMUIOVector local_qiov;
 
     if (be32_to_cpu(footer->type) == VHD_FIXED) {
-        return bdrv_co_pwritev(bs->file->bs, offset, bytes, qiov, 0);
+        return bdrv_co_pwritev(bs->file, offset, bytes, qiov, 0);
     }
 
     qemu_co_mutex_lock(&s->lock);
@@ -661,7 +661,7 @@ vpc_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
         qemu_iovec_reset(&local_qiov);
         qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
 
-        ret = bdrv_co_pwritev(bs->file->bs, image_offset, n_bytes,
+        ret = bdrv_co_pwritev(bs->file, image_offset, n_bytes,
                               &local_qiov, 0);
         if (ret < 0) {
             goto fail;
diff --git a/include/block/block.h b/include/block/block.h
index 4eaa1c1..616d8b9 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -249,8 +249,8 @@ int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
  * function is not suitable for zeroing the entire image in a single request
  * because it may allocate memory for the entire region.
  */
-int coroutine_fn bdrv_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
-    int count, BdrvRequestFlags flags);
+int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset,
+                                       int count, BdrvRequestFlags flags);
 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
     const char *backing_file);
 int bdrv_get_backing_file_depth(BlockDriverState *bs);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 0432ba5..47b9aac 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -563,10 +563,10 @@ extern BlockDriver bdrv_qcow2;
  */
 void bdrv_setup_io_funcs(BlockDriver *bdrv);
 
-int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
+int coroutine_fn bdrv_co_preadv(BdrvChild *child,
     int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
     BdrvRequestFlags flags);
-int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
+int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
     int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
     BdrvRequestFlags flags);
 
-- 
1.8.3.1

[Qemu-devel] [PULL 43/43] block/qcow2: Don't use cpu_to_*w()

[Kevin Wolf]

From: Peter Maydell <peter.maydell@linaro.org>

Don't use the cpu_to_*w() functions, which we are trying to deprecate.
Instead either just use cpu_to_*() to do the byteswap, or use
st*_be_p() if we need to do the store somewhere other than to a
variable that's already the correct type.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1466093177-17890-1-git-send-email-peter.maydell@linaro.org
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-cluster.c  |  2 +-
 block/qcow2-refcount.c | 11 +++++------
 block/qcow2.c          |  6 +++---
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index cf159f1..6b92ce9 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -117,7 +117,7 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
 
     /* set new table */
     BLKDBG_EVENT(bs->file, BLKDBG_L1_GROW_ACTIVATE_TABLE);
-    cpu_to_be32w((uint32_t*)data, new_l1_size);
+    stl_be_p(data, new_l1_size);
     stq_be_p(data + 4, new_l1_table_offset);
     ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_size),
                            data, sizeof(data));
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 13bbc9c..49b6ce6 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -562,8 +562,8 @@ static int alloc_refcount_block(BlockDriverState *bs,
         uint64_t d64;
         uint32_t d32;
     } data;
-    cpu_to_be64w(&data.d64, table_offset);
-    cpu_to_be32w(&data.d32, table_clusters);
+    data.d64 = cpu_to_be64(table_offset);
+    data.d32 = cpu_to_be32(table_clusters);
     BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE);
     ret = bdrv_pwrite_sync(bs->file,
                            offsetof(QCowHeader, refcount_table_offset),
@@ -2155,10 +2155,9 @@ write_refblocks:
     }
 
     /* Enter new reftable into the image header */
-    cpu_to_be64w(&reftable_offset_and_clusters.reftable_offset,
-                 reftable_offset);
-    cpu_to_be32w(&reftable_offset_and_clusters.reftable_clusters,
-                 size_to_clusters(s, reftable_size * sizeof(uint64_t)));
+    reftable_offset_and_clusters.reftable_offset = cpu_to_be64(reftable_offset);
+    reftable_offset_and_clusters.reftable_clusters =
+        cpu_to_be32(size_to_clusters(s, reftable_size * sizeof(uint64_t)));
     ret = bdrv_pwrite_sync(bs->file,
                            offsetof(QCowHeader, refcount_table_offset),
                            &reftable_offset_and_clusters,
diff --git a/block/qcow2.c b/block/qcow2.c
index 8a2c568..a5ea19b 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2739,9 +2739,9 @@ static int make_completely_empty(BlockDriverState *bs)
     /* "Create" an empty reftable (one cluster) directly after the image
      * header and an empty L1 table three clusters after the image header;
      * the cluster between those two will be used as the first refblock */
-    cpu_to_be64w(&l1_ofs_rt_ofs_cls.l1_offset, 3 * s->cluster_size);
-    cpu_to_be64w(&l1_ofs_rt_ofs_cls.reftable_offset, s->cluster_size);
-    cpu_to_be32w(&l1_ofs_rt_ofs_cls.reftable_clusters, 1);
+    l1_ofs_rt_ofs_cls.l1_offset = cpu_to_be64(3 * s->cluster_size);
+    l1_ofs_rt_ofs_cls.reftable_offset = cpu_to_be64(s->cluster_size);
+    l1_ofs_rt_ofs_cls.reftable_clusters = cpu_to_be32(1);
     ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_table_offset),
                            &l1_ofs_rt_ofs_cls, sizeof(l1_ofs_rt_ofs_cls));
     if (ret < 0) {
-- 
1.8.3.1

Re: [Qemu-devel] [PULL 18/43] block: Switch discard length bounds to byte-based

[Eric Blake]

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On 07/05/2016 09:50 AM, Kevin Wolf wrote:
> From: Eric Blake <eblake@redhat.com>
> 
> Sector-based limits are awkward to think about; in our on-going
> quest to move to byte-based interfaces, convert max_discard and
> discard_alignment.  Rename them, using 'pdiscard' as an aid to
> track which remaining discard interfaces need conversion, and so
> that the compiler will help us catch the change in semantics
> across any rebased code.  The BlockLimits type is now completely
> byte-based; and in iscsi.c, sector_limits_lun2qemu() is no
> longer needed.
> 

> +++ b/include/block/block_int.h
> @@ -324,11 +324,17 @@ struct BlockDriver {
>  };
>  
>  typedef struct BlockLimits {
> -    /* maximum number of sectors that can be discarded at once */
> -    int max_discard;
> -
> -    /* optimal alignment for discard requests in sectors */
> -    int64_t discard_alignment;
> +    /* maximum number of bytes that can be discarded at once (since it
> +     * is signed, it must be < 2G, if set), should be multiple of
> +     * pdiscard_alignment, but need not be power of 2. May be 0 if no
> +     * inherent 32-bit limit */
> +    int32_t max_pdiscard;
> +
> +    /* optimal alignment for discard requests in bytes, must be power
> +     * of 2, less than max_pdiscard if that is set, and multiple of
> +     * bs->request_alignment. May be 0 if bs->request_alignment is
> +     * good enough */
> +    uint32_t pdiscard_alignment;

Given the recent thread on an iscsi device with 15M optimum alignment
for zero and discards, I guess I have some followup patches to write if
we don't want to stall this pull request.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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Re: [Qemu-devel] [PULL 18/43] block: Switch discard length bounds to byte-based

[Kevin Wolf]

[-- Attachment #1: Type: text/plain, Size: 1941 bytes --]

Am 06.07.2016 um 04:14 hat Eric Blake geschrieben:
> On 07/05/2016 09:50 AM, Kevin Wolf wrote:
> > From: Eric Blake <eblake@redhat.com>
> > 
> > Sector-based limits are awkward to think about; in our on-going
> > quest to move to byte-based interfaces, convert max_discard and
> > discard_alignment.  Rename them, using 'pdiscard' as an aid to
> > track which remaining discard interfaces need conversion, and so
> > that the compiler will help us catch the change in semantics
> > across any rebased code.  The BlockLimits type is now completely
> > byte-based; and in iscsi.c, sector_limits_lun2qemu() is no
> > longer needed.
> > 
> 
> > +++ b/include/block/block_int.h
> > @@ -324,11 +324,17 @@ struct BlockDriver {
> >  };
> >  
> >  typedef struct BlockLimits {
> > -    /* maximum number of sectors that can be discarded at once */
> > -    int max_discard;
> > -
> > -    /* optimal alignment for discard requests in sectors */
> > -    int64_t discard_alignment;
> > +    /* maximum number of bytes that can be discarded at once (since it
> > +     * is signed, it must be < 2G, if set), should be multiple of
> > +     * pdiscard_alignment, but need not be power of 2. May be 0 if no
> > +     * inherent 32-bit limit */
> > +    int32_t max_pdiscard;
> > +
> > +    /* optimal alignment for discard requests in bytes, must be power
> > +     * of 2, less than max_pdiscard if that is set, and multiple of
> > +     * bs->request_alignment. May be 0 if bs->request_alignment is
> > +     * good enough */
> > +    uint32_t pdiscard_alignment;
> 
> Given the recent thread on an iscsi device with 15M optimum alignment
> for zero and discards, I guess I have some followup patches to write if
> we don't want to stall this pull request.

Please send a followup patch (series).

Does this one actually change the behaviour or just document the
behaviour that we already expected?

Kevin

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Re: [Qemu-devel] [PULL 00/43] Block layer patches

[Peter Maydell]

On 5 July 2016 at 16:50, Kevin Wolf <kwolf@redhat.com> wrote:
> The following changes since commit 60a0f1af07d685c88f4ffa09370da5bd7514823e:
>
>   Merge remote-tracking branch 'remotes/kraxel/tags/pull-ipxe-20160704-1' into staging (2016-07-05 12:46:18 +0100)
>
> are available in the git repository at:
>
>
>   git://repo.or.cz/qemu/kevin.git tags/for-upstream
>
> for you to fetch changes up to b0aaca4d7ff6f03acb9b2c0bc2f0d89267cc5dce:
>
>   Merge remote-tracking branch 'mreitz/tags/pull-block-for-kevin-2016-07-05-v2' into queue-block (2016-07-05 16:55:31 +0200)
>
> ----------------------------------------------------------------
>
> Block layer patches
>

Applied, thanks.

-- PMM

Re: [Qemu-devel] [PULL 26/43] vvfat: Use BdrvChild for s->qcow

[Paolo Bonzini]

On 05/07/2016 17:50, Kevin Wolf wrote:
> +};
> +
> +static int enable_write_target(BlockDriverState *bs, Error **errp)
> +{
> +    BDRVVVFATState *s = bs->opaque;
>      BlockDriver *bdrv_qcow = NULL;
>      BlockDriverState *backing;
>      QemuOpts *opts = NULL;
> @@ -3000,8 +3020,8 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp)
>  
>      options = qdict_new();
>      qdict_put(options, "driver", qstring_from_str("qcow"));
> -    s->qcow = bdrv_open(s->qcow_filename, NULL, options,
> -                        BDRV_O_RDWR | BDRV_O_NO_FLUSH, errp);
> +    s->qcow = bdrv_open_child(s->qcow_filename, options, "write-target", bs,
> +                              &child_vvfat_qcow, false, errp);
>      if (!s->qcow) {
>          ret = -EINVAL;
>          goto err;

For whatever reason, Coverity now notices that the "options" QDict is
leaked.  Who's right?

Paolo