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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-12-10 23:52:36 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-12-10 23:52:36 +0000 |
| commit | d2fdb776e08d4231d7e86a879cc663a93913c202 (patch) | |
| tree | 92c892ecca2bd1c9d405ba4cdaa85ba26a190023 /drivers/md | |
| parent | d8ddb1cfff0070479c1f4a07c1d4a48ef8cb188e (diff) | |
| download | linux-d2fdb776e08d4231d7e86a879cc663a93913c202.tar.gz linux-d2fdb776e08d4231d7e86a879cc663a93913c202.tar.bz2 linux-d2fdb776e08d4231d7e86a879cc663a93913c202.zip | |
dm snapshot: use merge origin if snapshot invalid
If the snapshot we are merging became invalid (e.g. it ran out of
space) redirect all I/O directly to the origin device.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-snap.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 4c80e82f941c..ee8eb283650d 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -1699,11 +1699,9 @@ static int snapshot_merge_map(struct dm_target *ti, struct bio *bio, down_write(&s->lock); - /* Full snapshots are not usable */ - if (!s->valid) { - r = -EIO; - goto out_unlock; - } + /* Full merging snapshots are redirected to the origin */ + if (!s->valid) + goto redirect_to_origin; /* If the block is already remapped - use that */ e = dm_lookup_exception(&s->complete, chunk); @@ -1726,6 +1724,7 @@ static int snapshot_merge_map(struct dm_target *ti, struct bio *bio, goto out_unlock; } +redirect_to_origin: bio->bi_bdev = s->origin->bdev; if (bio_rw(bio) == WRITE) { |