* - md-fix-various-bugs-with-aligned-reads-in-raid5.patch removed from -mm tree
@ 2007-02-10 5:21 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2007-02-10 5:21 UTC (permalink / raw)
To: neilb, epimetreus, jens.axboe, org, stable, mm-commits
The patch titled
md: fix various bugs with aligned reads in RAID5
has been removed from the -mm tree. Its filename was
md-fix-various-bugs-with-aligned-reads-in-raid5.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: md: fix various bugs with aligned reads in RAID5
From: Neil Brown <neilb@suse.de>
It is possible for raid5 to be sent a bio that is too big for an underlying
device. So if it is a READ that we pass stright down to a device, it will
fail and confuse RAID5.
So in 'chunk_aligned_read' we check that the bio fits within the parameters
for the target device and if it doesn't fit, fall back on reading through
the stripe cache and making lots of one-page requests.
Note that this is the earliest time we can check against the device because
earlier we don't have a lock on the device, so it could change underneath
us.
Also, the code for handling a retry through the cache when a read fails has
not been tested and was badly broken. This patch fixes that code.
Signed-off-by: Neil Brown <neilb@suse.de>
Cc: "Kai" <epimetreus@fastmail.fm>
Cc: <stable@suse.de>
Cc: <org@suse.de>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
block/ll_rw_blk.c | 2 +-
drivers/md/raid5.c | 42 +++++++++++++++++++++++++++++++++++++++---
2 files changed, 40 insertions(+), 4 deletions(-)
diff -puN block/ll_rw_blk.c~md-fix-various-bugs-with-aligned-reads-in-raid5 block/ll_rw_blk.c
--- a/block/ll_rw_blk.c~md-fix-various-bugs-with-aligned-reads-in-raid5
+++ a/block/ll_rw_blk.c
@@ -1264,7 +1264,7 @@ new_hw_segment:
bio->bi_hw_segments = nr_hw_segs;
bio->bi_flags |= (1 << BIO_SEG_VALID);
}
-
+EXPORT_SYMBOL(blk_recount_segments);
static int blk_phys_contig_segment(request_queue_t *q, struct bio *bio,
struct bio *nxt)
diff -puN drivers/md/raid5.c~md-fix-various-bugs-with-aligned-reads-in-raid5 drivers/md/raid5.c
--- a/drivers/md/raid5.c~md-fix-various-bugs-with-aligned-reads-in-raid5
+++ a/drivers/md/raid5.c
@@ -2620,7 +2620,7 @@ static struct bio *remove_bio_from_retry
}
bi = conf->retry_read_aligned_list;
if(bi) {
- conf->retry_read_aligned = bi->bi_next;
+ conf->retry_read_aligned_list = bi->bi_next;
bi->bi_next = NULL;
bi->bi_phys_segments = 1; /* biased count of active stripes */
bi->bi_hw_segments = 0; /* count of processed stripes */
@@ -2669,6 +2669,27 @@ static int raid5_align_endio(struct bio
return 0;
}
+static int bio_fits_rdev(struct bio *bi)
+{
+ request_queue_t *q = bdev_get_queue(bi->bi_bdev);
+
+ if ((bi->bi_size>>9) > q->max_sectors)
+ return 0;
+ blk_recount_segments(q, bi);
+ if (bi->bi_phys_segments > q->max_phys_segments ||
+ bi->bi_hw_segments > q->max_hw_segments)
+ return 0;
+
+ if (q->merge_bvec_fn)
+ /* it's too hard to apply the merge_bvec_fn at this stage,
+ * just just give up
+ */
+ return 0;
+
+ return 1;
+}
+
+
static int chunk_aligned_read(request_queue_t *q, struct bio * raid_bio)
{
mddev_t *mddev = q->queuedata;
@@ -2715,6 +2736,13 @@ static int chunk_aligned_read(request_qu
align_bi->bi_flags &= ~(1 << BIO_SEG_VALID);
align_bi->bi_sector += rdev->data_offset;
+ if (!bio_fits_rdev(align_bi)) {
+ /* too big in some way */
+ bio_put(align_bi);
+ rdev_dec_pending(rdev, mddev);
+ return 0;
+ }
+
spin_lock_irq(&conf->device_lock);
wait_event_lock_irq(conf->wait_for_stripe,
conf->quiesce == 0,
@@ -3107,7 +3135,9 @@ static int retry_aligned_read(raid5_con
last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9);
for (; logical_sector < last_sector;
- logical_sector += STRIPE_SECTORS, scnt++) {
+ logical_sector += STRIPE_SECTORS,
+ sector += STRIPE_SECTORS,
+ scnt++) {
if (scnt < raid_bio->bi_hw_segments)
/* already done this stripe */
@@ -3123,7 +3153,13 @@ static int retry_aligned_read(raid5_con
}
set_bit(R5_ReadError, &sh->dev[dd_idx].flags);
- add_stripe_bio(sh, raid_bio, dd_idx, 0);
+ if (!add_stripe_bio(sh, raid_bio, dd_idx, 0)) {
+ release_stripe(sh);
+ raid_bio->bi_hw_segments = scnt;
+ conf->retry_read_aligned = raid_bio;
+ return handled;
+ }
+
handle_stripe(sh, NULL);
release_stripe(sh);
handled++;
_
Patches currently in -mm which might be from neilb@suse.de are
origin.patch
revert-md-avoid-possible-bug_on-in-md-bitmap-handling-for-git-block.patch
igrab-should-check-for-i_clear.patch
replace-highest_possible_node_id-with-nr_node_ids.patch
replace-highest_possible_node_id-with-nr_node_ids-fix.patch
convert-highest_possible_processor_id-to-nr_cpu_ids.patch
fix-d_path-for-lazy-unmounts.patch
fix-quadratic-behavior-of-shrink_dcache_parent.patch
knfsd-sunrpc-update-internal-api-separate-pmap-register-and-temp-sockets.patch
knfsd-sunrpc-allow-creating-an-rpc-service-without-registering-with-portmapper.patch
knfsd-sunrpc-aplit-svc_sock_enqueue-out-of-svc_setup_socket.patch
knfsd-sunrpc-cache-remote-peers-address-in-svc_sock.patch
knfsd-sunrpc-dont-set-msg_name-and-msg_namelen-when-calling-sock_recvmsg.patch
knfsd-sunrpc-add-a-function-to-format-the-address-in-an-svc_rqst-for-printing.patch
knfsd-sunrpc-use-sockaddr_storage-to-store-address-in-svc_deferred_req.patch
knfsd-sunrpc-provide-room-in-svc_rqst-for-larger-addresses.patch
knfsd-sunrpc-make-rq_daddr-field-address-version-independent.patch
knfsd-sunrpc-teach-svc_sendto-to-deal-with-ipv6-addresses.patch
knfsd-sunrpc-teach-svc_sendto-to-deal-with-ipv6-addresses-tidy.patch
knfsd-sunrpc-add-a-generic-function-to-see-if-the-peer-uses-a-secure-port.patch
knfsd-sunrpc-support-ipv6-addresses-in-svc_tcp_accept.patch
knfsd-sunrpc-support-ipv6-addresses-in-rpc-servers-udp-receive-path.patch
knfsd-sunrpc-support-ipv6-addresses-in-rpc-servers-udp-receive-path-tidy.patch
knfsd-sunrpc-fix-up-svc_create_socket-to-take-a-sockaddr-struct-length.patch
include-linux-nfsd-consth-remove-nfs_super_magic.patch
readahead-nfsd-case.patch
readahead-nfsd-case-fix.patch
drivers-mdc-use-array_size-macro-when-appropriate.patch
md-dm-reduce-stack-usage-with-stacked-block-devices.patch
sysctl-remove-insert_at_head-from-register_sysctl.patch
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2007-02-10 5:21 - md-fix-various-bugs-with-aligned-reads-in-raid5.patch removed from -mm tree akpm
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