diff options
| author | NeilBrown <neilb@suse.de> | 2014-01-05 21:19:42 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-25 11:27:12 -0500 |
| commit | c44bc4496d29b70f95f2197eb950581a455c92a8 (patch) | |
| tree | e681d062ef4dcab42f4dc585999934ad4d4dbf6f /drivers/md | |
| parent | ddd618aa9eee9f143d750d15497bf6f117874928 (diff) | |
md/raid5: Fix possible confusion when multiple write errors occur.
commit 1cc03eb93245e63b0b7a7832165efdc52e25b4e6 upstream.
commit 5d8c71f9e5fbdd95650be00294d238e27a363b5c
md: raid5 crash during degradation
Fixed a crash in an overly simplistic way which could leave
R5_WriteError or R5_MadeGood set in the stripe cache for devices
for which it is no longer relevant.
When those devices are removed and spares added the flags are still
set and can cause incorrect behaviour.
commit 14a75d3e07c784c004b4b44b34af996b8e4ac453
md/raid5: preferentially read from replacement device if possible.
Fixed the same bug if a more effective way, so we can now revert
the original commit.
Reported-and-tested-by: Alexander Lyakas <alex.bolshoy@gmail.com>
Fixes: 5d8c71f9e5fbdd95650be00294d238e27a363b5c
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 4bed5454b8dc..51422999fd08 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c | |||
| @@ -3391,7 +3391,7 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) | |||
| 3391 | */ | 3391 | */ |
| 3392 | set_bit(R5_Insync, &dev->flags); | 3392 | set_bit(R5_Insync, &dev->flags); |
| 3393 | 3393 | ||
| 3394 | if (rdev && test_bit(R5_WriteError, &dev->flags)) { | 3394 | if (test_bit(R5_WriteError, &dev->flags)) { |
| 3395 | /* This flag does not apply to '.replacement' | 3395 | /* This flag does not apply to '.replacement' |
| 3396 | * only to .rdev, so make sure to check that*/ | 3396 | * only to .rdev, so make sure to check that*/ |
| 3397 | struct md_rdev *rdev2 = rcu_dereference( | 3397 | struct md_rdev *rdev2 = rcu_dereference( |
| @@ -3404,7 +3404,7 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s) | |||
| 3404 | } else | 3404 | } else |
| 3405 | clear_bit(R5_WriteError, &dev->flags); | 3405 | clear_bit(R5_WriteError, &dev->flags); |
| 3406 | } | 3406 | } |
| 3407 | if (rdev && test_bit(R5_MadeGood, &dev->flags)) { | 3407 | if (test_bit(R5_MadeGood, &dev->flags)) { |
| 3408 | /* This flag does not apply to '.replacement' | 3408 | /* This flag does not apply to '.replacement' |
| 3409 | * only to .rdev, so make sure to check that*/ | 3409 | * only to .rdev, so make sure to check that*/ |
| 3410 | struct md_rdev *rdev2 = rcu_dereference( | 3410 | struct md_rdev *rdev2 = rcu_dereference( |