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| author | Shaohua Li <shli@fb.com> | 2015-09-04 14:14:05 -0700 |
|---|---|---|
| committer | NeilBrown <neilb@suse.com> | 2015-11-01 13:48:26 +1100 |
| commit | 85f2f9a4f49d3e3230b3c5fb08362d561691421e (patch) | |
| tree | 2cac2cfdac6a7f602ea81f8bd20c38f7269c9a22 /drivers/md | |
| parent | bd18f6462f3d167a9b3ec27851c98f82694b2adf (diff) | |
| download | linux-85f2f9a4f49d3e3230b3c5fb08362d561691421e.tar.gz linux-85f2f9a4f49d3e3230b3c5fb08362d561691421e.tar.bz2 linux-85f2f9a4f49d3e3230b3c5fb08362d561691421e.zip | |
raid5-cache: check stripe finish out of order
stripes could finish out of order. Hence r5l_move_io_unit_list() of
__r5l_stripe_write_finished might not move any entry and leave
stripe_end_ios list empty.
This applies on top of http://marc.info/?l=linux-raid&m=144122700510667
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5-cache.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c index ea1480392eba..30c7e5e79a02 100644 --- a/drivers/md/raid5-cache.c +++ b/drivers/md/raid5-cache.c @@ -550,8 +550,13 @@ static void __r5l_stripe_write_finished(struct r5l_io_unit *io) spin_lock_irqsave(&log->io_list_lock, flags); __r5l_set_io_unit_state(io, IO_UNIT_STRIPE_END); + /* might move 0 entry */ r5l_move_io_unit_list(&log->flushed_ios, &log->stripe_end_ios, IO_UNIT_STRIPE_END); + if (list_empty(&log->stripe_end_ios)) { + spin_unlock_irqrestore(&log->io_list_lock, flags); + return; + } last = list_last_entry(&log->stripe_end_ios, struct r5l_io_unit, log_sibling); |