This is a note to let you know that I've just added the patch titled
md/raid5: Fix possible confusion when multiple write errors occur.
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid5-fix-possible-confusion-when-multiple-write-errors-occur.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1cc03eb93245e63b0b7a7832165efdc52e25b4e6 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Mon, 6 Jan 2014 13:19:42 +1100
Subject: md/raid5: Fix possible confusion when multiple write errors occur.
From: NeilBrown <neilb@xxxxxxx>
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@xxxxxxxxx>
Fixes: 5d8c71f9e5fbdd95650be00294d238e27a363b5c
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid5.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3238,7 +3238,7 @@ static void analyse_stripe(struct stripe
*/
set_bit(R5_Insync, &dev->flags);
- if (rdev && test_bit(R5_WriteError, &dev->flags)) {
+ if (test_bit(R5_WriteError, &dev->flags)) {
/* This flag does not apply to '.replacement'
* only to .rdev, so make sure to check that*/
struct md_rdev *rdev2 = rcu_dereference(
@@ -3251,7 +3251,7 @@ static void analyse_stripe(struct stripe
} else
clear_bit(R5_WriteError, &dev->flags);
}
- if (rdev && test_bit(R5_MadeGood, &dev->flags)) {
+ if (test_bit(R5_MadeGood, &dev->flags)) {
/* This flag does not apply to '.replacement'
* only to .rdev, so make sure to check that*/
struct md_rdev *rdev2 = rcu_dereference(
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.4/md-raid10-fix-bug-when-raid10-recovery-fails-to-recover-a-block.patch
queue-3.4/md-raid5-fix-possible-confusion-when-multiple-write-errors-occur.patch
queue-3.4/md-raid10-fix-two-bugs-in-handling-of-known-bad-blocks.patch
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