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| author | Dan Williams <dan.j.williams@intel.com> | 2007-10-22 20:45:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-23 08:32:06 -0700 |
| commit | 4ae3f847e49e3787eca91bced31f8fd328d50496 (patch) | |
| tree | 9fab60c4898e49cf1cf04e360dc63ae1d0ef5bd2 /drivers/md | |
| parent | 85bfb4da8cad483a4e550ec89060d05a4daf895b (diff) | |
| download | linux-3.10-4ae3f847e49e3787eca91bced31f8fd328d50496.tar.gz linux-3.10-4ae3f847e49e3787eca91bced31f8fd328d50496.tar.bz2 linux-3.10-4ae3f847e49e3787eca91bced31f8fd328d50496.zip | |
md: raid5: fix clearing of biofill operations
ops_complete_biofill() runs outside of spin_lock(&sh->lock) and clears the
'pending' and 'ack' bits. Since the test_and_ack_op() macro only checks
against 'complete' it can get an inconsistent snapshot of pending work.
Move the clearing of these bits to handle_stripe5(), under the lock.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Joel Bertrand <joel.bertrand@systella.fr>
Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Stable <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 8ee181a01f5..80a67d789b7 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -376,7 +376,12 @@ static unsigned long get_stripe_work(struct stripe_head *sh) ack++; sh->ops.count -= ack; - BUG_ON(sh->ops.count < 0); + if (unlikely(sh->ops.count < 0)) { + printk(KERN_ERR "pending: %#lx ops.pending: %#lx ops.ack: %#lx " + "ops.complete: %#lx\n", pending, sh->ops.pending, + sh->ops.ack, sh->ops.complete); + BUG(); + } return pending; } @@ -550,8 +555,7 @@ static void ops_complete_biofill(void *stripe_head_ref) } } } - clear_bit(STRIPE_OP_BIOFILL, &sh->ops.ack); - clear_bit(STRIPE_OP_BIOFILL, &sh->ops.pending); + set_bit(STRIPE_OP_BIOFILL, &sh->ops.complete); return_io(return_bi); @@ -2893,6 +2897,13 @@ static void handle_stripe6(struct stripe_head *sh, struct page *tmp_page) s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state); /* Now to look around and see what can be done */ + /* clean-up completed biofill operations */ + if (test_bit(STRIPE_OP_BIOFILL, &sh->ops.complete)) { + clear_bit(STRIPE_OP_BIOFILL, &sh->ops.pending); + clear_bit(STRIPE_OP_BIOFILL, &sh->ops.ack); + clear_bit(STRIPE_OP_BIOFILL, &sh->ops.complete); + } + rcu_read_lock(); for (i=disks; i--; ) { mdk_rdev_t *rdev; |