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| author | NeilBrown <neilb@suse.de> | 2011-10-26 03:31:04 +0400 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-10-26 03:31:04 +0400 |
| commit | 355840e7a7e56bb2834fd3b0da64da5465f8aeaa (patch) | |
| tree | 8ba816b2db3b96872f744c476c3d3d0d3f12fd23 | |
| parent | bd860c53d4f9cad520d233e1ba690aaacfb39e9b (diff) | |
| download | linux-355840e7a7e56bb2834fd3b0da64da5465f8aeaa.tar.xz | |
md/raid5: fix bug that could result in reads from a failed device.
This bug was introduced in 415e72d034c50520ddb7ff79e7d1792c1306f0c9
which was in 2.6.36.
There is a small window of time between when a device fails and when
it is removed from the array. During this time we might still read
from it, but we won't write to it - so it is possible that we could
read stale data.
We didn't need the test of 'Faulty' before because the test on
In_sync is sufficient. Since we started allowing reads from the early
part of non-In_sync devices we need a test on Faulty too.
This is suitable for any kernel from 2.6.36 onwards, though the patch
might need a bit of tweaking in 3.0 and earlier.
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/raid5.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index eea9379f7fae..521bf2605f82 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3062,7 +3062,7 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) } } else if (test_bit(In_sync, &rdev->flags)) set_bit(R5_Insync, &dev->flags); - else { + else if (!test_bit(Faulty, &rdev->flags)) { /* in sync if before recovery_offset */ if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset) set_bit(R5_Insync, &dev->flags); |