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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-12-10 23:52:33 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-12-10 23:52:33 +0000 |
| commit | 17aa03326d40614db94bc51fbbc92df628a5c97c (patch) | |
| tree | a9661a11274731b6b8e2fcbaace7d4424b9cefb6 /drivers/md/dm-snap.c | |
| parent | 9fe862548821b0c206c58e8057b782530a173703 (diff) | |
| download | lwn-17aa03326d40614db94bc51fbbc92df628a5c97c.tar.gz lwn-17aa03326d40614db94bc51fbbc92df628a5c97c.zip | |
dm snapshot: delay merging a chunk until writes to it complete
Track writes to chunks that are currently being merged and delay merging
a chunk until all writes to that chunk finish.
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/dm-snap.c')
| -rw-r--r-- | drivers/md/dm-snap.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 91a47c522b09..bc52776c69cc 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -892,7 +892,7 @@ static void snapshot_merge_next_chunks(struct dm_snapshot *s) s->num_merging_chunks = 1; up_write(&s->lock); - /* !!! FIXME: wait until writes to this chunk drain */ + __check_for_conflicting_io(s, old_chunk); dm_kcopyd_copy(s->kcopyd_client, &src, 1, &dest, 0, merge_callback, s); return; @@ -1635,7 +1635,11 @@ static int snapshot_merge_map(struct dm_target *ti, struct bio *bio, r = DM_MAPIO_SUBMITTED; goto out_unlock; } + remap_exception(s, e, bio, chunk); + + if (bio_rw(bio) == WRITE) + map_context->ptr = track_chunk(s, chunk); goto out_unlock; } |