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Two md bugfixes for possible corruption when restarting reshape

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If a raid5/6 reshape is restarted (After stopping and re-assembling
 the array) and the array is marked read-only (or read-auto), then
 the reshape will appear to complete immediately, without actually
 moving anything around.  This can result in corruption.
 
 There are two patches which do much the same thing in different places.
 They are separate because one is an older bug and so can be applied to
 more -stable kernels.
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Merge tag 'md/3.15-fixes' of git://neil.brown.name/md

Pull two md bugfixes from Neil Brown:
 "Two md bugfixes for possible corruption when restarting reshape

  If a raid5/6 reshape is restarted (After stopping and re-assembling
  the array) and the array is marked read-only (or read-auto), then the
  reshape will appear to complete immediately, without actually moving
  anything around.  This can result in corruption.

  There are two patches which do much the same thing in different
  places.  They are separate because one is an older bug and so can be
  applied to more -stable kernels"

* tag 'md/3.15-fixes' of git://neil.brown.name/md:
  md: always set MD_RECOVERY_INTR when interrupting a reshape thread.
  md: always set MD_RECOVERY_INTR when aborting a reshape or other "resync".
This commit is contained in:
Linus Torvalds 2014-06-02 17:04:37 -07:00
commit ca755175f2
1 changed files with 4 additions and 1 deletions
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5
drivers/md/md.c
View file

@ -7381,8 +7381,10 @@ void md_do_sync(struct md_thread *thread)
/* just incase thread restarts... */
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
return;
if (mddev->ro) /* never try to sync a read-only array */
if (mddev->ro) {/* never try to sync a read-only array */
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
return;
}
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) {
@ -7824,6 +7826,7 @@ void md_check_recovery(struct mddev *mddev)
/* 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;