From: Mikulas Patocka <mpatocka@xxxxxxxxxx> Track merging snapshot device's in-progress writes, to chunks that were already remapped, and delay merging a chunk until all writes to that chunk finish. Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> Reviewed-by: Mike Snitzer <snitzer@xxxxxxxxxx> --- drivers/md/dm-snap.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 3504672..45c47b0 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -788,7 +788,8 @@ static void snapshot_merge_process(struct dm_snapshot *s) s->merge_write_interlock_n = 1; up_write(&s->lock); - /* !!! FIXME: wait until writes to this chunk drain */ + while (__chunk_is_tracked(s, old_chunk)) + msleep(1); dm_kcopyd_copy(s->kcopyd_client, &src, 1, &dest, 0, merge_callback, s); return; @@ -1561,7 +1562,11 @@ 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; } -- 1.6.5.2 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
