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dm snapshot: fix metadata corruption

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Commit 55494bf294 ("dm snapshot: use dm-bufio") broke snapshots.
Before that 3.14-rc1 commit, loading a snapshot's list of exceptions
involved reading exception areas one by one into ps->area and inserting
those exceptions into the hash table.  Commit 55494bf294 changed
it so that dm-bufio with prefetch is used to load exceptions in batchs.
Exceptions are loaded correctly, but ps->area is left uninitialized.
When a new exception is allocated, it is stored in this uninitialized
ps->area which will be written to the disk.  This causes metadata
corruption.

Fix this corruption by copying the last area that was read via dm-bufio
into ps->area.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2014-03-03 17:19:22 -05:00 committed by Mike Snitzer
parent c64d240df3
commit 2c945820ca
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm-snap-persistent.c
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@ -546,6 +546,9 @@ static int read_exceptions(struct pstore *ps,
r = insert_exceptions(ps, area, callback, callback_context,
&full);
if (!full)
memcpy(ps->area, area, ps->store->chunk_size << SECTOR_SHIFT);
dm_bufio_release(bp);
dm_bufio_forget(client, chunk);