diff options
| 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/md.c | |
| 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/md.c')
0 files changed, 0 insertions, 0 deletions