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| author | Logan Gunthorpe <logang@deltatee.com> | 2022-07-27 23:06:00 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-08-03 05:08:53 +0200 |
| commit | 20313b1b8cd1bda34ee136b656c39ff2ae189330 (patch) | |
| tree | 30c3b19a52812a921535503af1fce64226ed16ff /drivers/md/raid5.h | |
| parent | md/raid5: Move stripe_request_ctx up (diff) | |
| download | linux-20313b1b8cd1bda34ee136b656c39ff2ae189330.tar.xz linux-20313b1b8cd1bda34ee136b656c39ff2ae189330.zip | |
md/raid5: Ensure batch_last is released before sleeping for quiesce
A race condition exists where if raid5_quiesce() is called in the
middle of a request that has set batch_last, it will deadlock.
batch_last will hold a reference to a stripe when raid5_quiesce() is
called. This will cause the next raid5_get_active_stripe() call to
sleep waiting for the quiesce to finish, but the raid5_quiesce() thread
will wait for active_stripes to go to zero which will never happen
because request thread is waiting for the quiesce to stop.
Fix this by creating a special __raid5_get_active_stripe() function
which takes the request context and clears the last_batch before
sleeping.
While we're at it, change the arguments of raid5_get_active_stripe()
to bools.
Fixes: 3312e6c887fe ("md/raid5: Keep a reference to last stripe_head for batch")
Reported-by: David Sloan <David.Sloan@eideticom.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
| -rw-r--r-- | drivers/md/raid5.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 638d29863503..a5082bed83c8 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -812,7 +812,7 @@ extern sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector, struct stripe_head *sh); extern struct stripe_head * raid5_get_active_stripe(struct r5conf *conf, sector_t sector, - int previous, int noblock, int noquiesce); + bool previous, bool noblock, bool noquiesce); extern int raid5_calc_degraded(struct r5conf *conf); extern int r5c_journal_mode_set(struct mddev *mddev, int journal_mode); #endif |