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  1. 27 Jun, 2008 3 commits
    • Neil Brown's avatar
      Fix error paths if md_probe fails. · 9bbbca3a
      Neil Brown authored 
      md_probe can fail (e.g. alloc_disk could fail) without
returning an error (as it alway returns NULL).
So when we call mddev_find immediately afterwards, we need
to check that md_probe actually succeeded.  This means checking
that mdev->gendisk is non-NULL.

cc: <stable@kernel.org>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: default avatarNeil Brown <neilb@suse.de>
      9bbbca3a
    • Neil Brown's avatar
      Don't acknowlege that stripe-expand is complete until it really is. · efe31143
      Neil Brown authored 
      We shouldn't acknowledge that a stripe has been expanded (When
reshaping a raid5 by adding a device) until the moved data has
actually been written out.  However we are currently
acknowledging (by calling md_done_sync) when the POST_XOR
is complete and before the write.

So track in s.locked whether there are pending writes, and don't
call md_done_sync yet if there are.

Note: we all set R5_LOCKED on devices which are are about to
read from.  This probably isn't technically necessary, but is
usually done when writing a block, and justifies the use of
s.locked here.

This bug can lead to a crash if an array is stopped while an reshape
is in progress.

Cc: <stable@kernel.org>
Signed-off-by: default avatarNeil Brown <neilb@suse.de>
      efe31143
    • Neil Brown's avatar
      Ensure interrupted recovery completed properly (v1 metadata plus bitmap) · 8c2e870a
      Neil Brown authored 
      If, while assembling an array, we find a device which is not fully
in-sync with the array, it is important to set the "fullsync" flags.
This is an exact analog to the setting of this flag in hot_add_disk
methods.

Currently, only v1.x metadata supports having devices in an array
which are not fully in-sync (it keep track of how in sync they are).
The 'fullsync' flag only makes a difference when a write-intent bitmap
is being used.  In this case it tells recovery to ignore the bitmap
and recovery all blocks.

This fix is already in place for raid1, but not raid5/6 or raid10.

So without this fix, a raid1 ir raid4/5/6 array with version 1.x
metadata and a write intent bitmaps, that is stopped in the middle
of a recovery, will appear to complete the recovery instantly
after it is reassembled, but the recovery will not be correct.

If you might have an array like that, issueing
   echo repair > /sys/block/mdXX/md/sync_action

will make sure recovery completes properly.

Cc: <stable@kernel.org>
Signed-off-by: default avatarNeil Brown <neilb@suse.de>
      8c2e870a
  3. 25 Jun, 2008 4 commits
  5. 24 Jun, 2008 26 commits
  7. 23 Jun, 2008 7 commits
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