The patch titled
md: raid5: fix clearing of biofill operations
has been added to the -mm tree. Its filename is
md-raid5-fix-clearing-of-biofill-operations.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: md: raid5: fix clearing of biofill operations
From: Dan Williams <dan.j.williams@xxxxxxxxx>
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@xxxxxxxxx>
Tested-by: Joel Bertrand <joel.bertrand@xxxxxxxxxxx>
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Cc: Stable <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid5.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff -puN drivers/md/raid5.c~md-raid5-fix-clearing-of-biofill-operations drivers/md/raid5.c
--- a/drivers/md/raid5.c~md-raid5-fix-clearing-of-biofill-operations
+++ a/drivers/md/raid5.c
@@ -376,7 +376,12 @@ static unsigned long get_stripe_work(str
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 *s
}
}
}
- 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
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;
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
origin.patch
md-raid5-fix-clearing-of-biofill-operations.patch
git-md-accel.patch
-
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