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authorMikulas Patocka <mpatocka@redhat.com>2009-06-22 10:12:23 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 10:12:23 +0100
commitc927259e34e518d913d86f51c71b786a513f94d6 (patch)
tree0797e9e4689749ad70b6739f845374dc9c57c65d
parent647c7db14ef9cacc4ccb3683e206b61f0de6dc2b (diff)
dm delay: support barriers
Flush support for dm-delay target. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
-rw-r--r--drivers/md/dm-delay.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 559dbb52bc85..8ad8a9044bbf 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -197,6 +197,7 @@ out:
mutex_init(&dc->timer_lock);
atomic_set(&dc->may_delay, 1);
+ ti->num_flush_requests = 1;
ti->private = dc;
return 0;
@@ -278,8 +279,9 @@ static int delay_map(struct dm_target *ti, struct bio *bio,
if ((bio_data_dir(bio) == WRITE) && (dc->dev_write)) {
bio->bi_bdev = dc->dev_write->bdev;
- bio->bi_sector = dc->start_write +
- (bio->bi_sector - ti->begin);
+ if (bio_sectors(bio))
+ bio->bi_sector = dc->start_write +
+ (bio->bi_sector - ti->begin);
return delay_bio(dc, dc->write_delay, bio);
}