Commit 45e621d4 authored by Mike Snitzer's avatar Mike Snitzer Committed by Alasdair G Kergon
Browse files

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: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 7de3ee57

drivers/md/dm-stripe.c

+6 −4
Original line number Diff line number Diff line
@@ -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))
@@ -251,7 +252,7 @@ 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,

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);