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| author |   Bian Yu <bianyu@kedacom.com> | 2013-11-14 15:16:17 +1100 |
|---|---|---|
| committer |   NeilBrown <neilb@suse.de> | 2013-11-19 15:18:24 +1100 |
| commit | edfa1f651e93261eecb034d02284ece103dd691a (patch) | |
| tree | 0a4087a7fb9a26089e99592f87bc515bbe60e789 /drivers/md | |
| parent | raid5: relieve lock contention in get_active_stripe() (diff) | |
| download | linux-dev-edfa1f651e93261eecb034d02284ece103dd691a.tar.xz linux-dev-edfa1f651e93261eecb034d02284ece103dd691a.zip | |
raid5: Retry R5_ReadNoMerge flag when hit a read error.
Because of block layer merge, one bio fails will cause other bios
which belongs to the same request fails, so raid5_end_read_request
will record all these bios as badblocks.
If retry request with R5_ReadNoMerge flag to avoid bios merge,
badblocks can only record sector which is bad exactly.
test:
hdparm --yes-i-know-what-i-am-doing --make-bad-sector 300000 /dev/sdb
mdadm -C /dev/md0 -l5 -n3 /dev/sd[bcd] --assume-clean
mdadm /dev/md0 -f /dev/sdd
mdadm /dev/md0 -r /dev/sdd
mdadm --zero-superblock /dev/sdd
mdadm /dev/md0 -a /dev/sdd
1. Without this patch:
cat /sys/block/md0/md/rd*/bad_blocks
299776 256
299776 256
2. With this patch:
cat /sys/block/md0/md/rd*/bad_blocks
300000 8
300000 8
Signed-off-by: Bian Yu <bianyu@kedacom.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 1fb28c56457a..2c8907706109 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2056,6 +2056,9 @@ static void raid5_end_read_request(struct bio * bi, int error) mdname(conf->mddev), bdn); else retry = 1; + if (set_bad && test_bit(In_sync, &rdev->flags) + && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) + retry = 1; if (retry) if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { set_bit(R5_ReadError, &sh->dev[i].flags); |