This is a note to let you know that I've just added the patch titled
md: always set MD_RECOVERY_INTR when interrupting a reshape thread.
to the 3.14-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-always-set-md_recovery_intr-when-interrupting-a-reshape-thread.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2ac295a544dcae9299cba13ce250419117ae7fd1 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Thu, 29 May 2014 11:40:03 +1000
Subject: md: always set MD_RECOVERY_INTR when interrupting a reshape thread.
From: NeilBrown <neilb@xxxxxxx>
commit 2ac295a544dcae9299cba13ce250419117ae7fd1 upstream.
Commit 8313b8e57f55b15e5b7f7fc5d1630bbf686a9a97
md: fix problem when adding device to read-only array with bitmap.
added a called to md_reap_sync_thread() which cause a reshape thread
to be interrupted (in particular, it could cause md_thread() to never even
call md_do_sync()).
However it didn't set MD_RECOVERY_INTR so ->finish_reshape() would not
know that the reshape didn't complete.
This only happens when mddev->ro is set and normally reshape threads
don't run in that situation. But raid5 and raid10 can start a reshape
thread during "run" is the array is in the middle of a reshape.
They do this even if ->ro is set.
So it is best to set MD_RECOVERY_INTR before abortingg the
sync thread, just in case.
Though it rare for this to trigger a problem it can cause data corruption
because the reshape isn't finished properly.
So it is suitable for any stable which the offending commit was applied to.
(3.2 or later)
Fixes: 8313b8e57f55b15e5b7f7fc5d1630bbf686a9a97
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/md.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7840,6 +7840,7 @@ void md_check_recovery(struct mddev *mdd
/* There is no thread, but we need to call
* ->spare_active and clear saved_raid_disk
*/
+ set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_reap_sync_thread(mddev);
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
goto unlock;
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.14/md-always-set-md_recovery_intr-when-aborting-a-reshape-or-other-resync.patch
queue-3.14/md-always-set-md_recovery_intr-when-interrupting-a-reshape-thread.patch
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