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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>
This commit is contained in:
Mike Snitzer 2012-12-21 20:23:41 +00:00 committed by Alasdair G Kergon
parent 7de3ee57da
commit 45e621d45e
1 changed files with 6 additions and 4 deletions
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10
drivers/md/dm-stripe.c
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@ -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);