diff options
| author | NeilBrown <neilb@suse.de> | 2012-09-19 04:52:30 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-09-19 04:52:30 +0200 |
| commit | e5c86471f933608db5d43679f84cb4346c32033e (patch) | |
| tree | e596b35a134b9cc4e308f90090ecf9998a5b58a4 | |
| parent | Revert "md/raid5: For odirect-write performance, do not set STRIPE_PREREAD_AC... (diff) | |
| download | linux-e5c86471f933608db5d43679f84cb4346c32033e.tar.xz linux-e5c86471f933608db5d43679f84cb4346c32033e.zip | |
md/raid5: fix calculate of 'degraded' when a replacement becomes active.
When a replacement device becomes active, we mark the device that it
replaces as 'faulty' so that it can subsequently get removed.
However 'calc_degraded' only pays attention to the primary device, not
the replacement, so the array appears to become degraded, which is
wrong.
So teach 'calc_degraded' to consider any replacement if a primary
device is faulty.
This is suitable for -stable as an incorrect 'degraded' value can
confuse md and could lead to data corruption.
This is only relevant for 3.3 and later.
Cc: stable@vger.kernel.org
Reported-by: Robin Hill <robin@robinhill.me.uk>
Reported-by: John Drescher <drescherjm@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 380cb68856b1..7031b865b3a0 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -393,6 +393,8 @@ static int calc_degraded(struct r5conf *conf) degraded = 0; for (i = 0; i < conf->previous_raid_disks; i++) { struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); + if (rdev && test_bit(Faulty, &rdev->flags)) + rdev = rcu_dereference(conf->disks[i].replacement); if (!rdev || test_bit(Faulty, &rdev->flags)) degraded++; else if (test_bit(In_sync, &rdev->flags)) @@ -417,6 +419,8 @@ static int calc_degraded(struct r5conf *conf) degraded2 = 0; for (i = 0; i < conf->raid_disks; i++) { struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev); + if (rdev && test_bit(Faulty, &rdev->flags)) + rdev = rcu_dereference(conf->disks[i].replacement); if (!rdev || test_bit(Faulty, &rdev->flags)) degraded2++; else if (test_bit(In_sync, &rdev->flags)) |