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authorMike Snitzer <snitzer@redhat.com>2012-12-21 20:23:41 +0000
committerAlasdair G Kergon <agk@redhat.com>2012-12-21 20:23:41 +0000
commit45e621d45e24ffc4cb2b2935e8438987b860063a (patch)
tree96c49f06c5bb6b2f6f8d01dc354d59202a7954a5
parent7de3ee57da4b717050e79c9313a9bf66ccc72519 (diff)
dm stripe: add WRITE SAME support
Rename stripe_map_discard to stripe_map_range and reuse it for WRITE SAME bio processing. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
-rw-r--r--drivers/md/dm-stripe.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 6b0e5ea38027..c89cde86d400 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -162,6 +162,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ti->num_flush_requests = stripes;
ti->num_discard_requests = stripes;
+ ti->num_write_same_requests = stripes;
sc->chunk_size = chunk_size;
if (chunk_size & (chunk_size - 1))
@@ -251,8 +252,8 @@ static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector,
*result += sc->chunk_size; /* next chunk */
}
-static int stripe_map_discard(struct stripe_c *sc, struct bio *bio,
- uint32_t target_stripe)
+static int stripe_map_range(struct stripe_c *sc, struct bio *bio,
+ uint32_t target_stripe)
{
sector_t begin, end;
@@ -283,10 +284,11 @@ static int stripe_map(struct dm_target *ti, struct bio *bio)
bio->bi_bdev = sc->stripe[target_request_nr].dev->bdev;
return DM_MAPIO_REMAPPED;
}
- if (unlikely(bio->bi_rw & REQ_DISCARD)) {
+ if (unlikely(bio->bi_rw & REQ_DISCARD) ||
+ unlikely(bio->bi_rw & REQ_WRITE_SAME)) {
target_request_nr = dm_bio_get_target_request_nr(bio);
BUG_ON(target_request_nr >= sc->stripes);
- return stripe_map_discard(sc, bio, target_request_nr);
+ return stripe_map_range(sc, bio, target_request_nr);
}
stripe_map_sector(sc, bio->bi_sector, &stripe, &bio->bi_sector);