diff options
Diffstat (limited to 'drivers/md/dm-io.c')
| -rw-r--r-- | drivers/md/dm-io.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index 1c46f97..ea49834 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -287,7 +287,8 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where, unsigned num_bvecs; sector_t remaining = where->count; struct request_queue *q = bdev_get_queue(where->bdev); - sector_t discard_sectors; + unsigned short logical_block_size = queue_logical_block_size(q); + sector_t num_sectors; /* * where->count may be zero if rw holds a flush and we need to @@ -297,7 +298,7 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where, /* * Allocate a suitably sized-bio. */ - if (rw & REQ_DISCARD) + if ((rw & REQ_DISCARD) || (rw & REQ_WRITE_SAME)) num_bvecs = 1; else num_bvecs = min_t(int, bio_get_nr_vecs(where->bdev), @@ -310,9 +311,21 @@ static void do_region(int rw, unsigned region, struct dm_io_region *where, store_io_and_region_in_bio(bio, io, region); if (rw & REQ_DISCARD) { - discard_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining); - bio->bi_size = discard_sectors << SECTOR_SHIFT; - remaining -= discard_sectors; + num_sectors = min_t(sector_t, q->limits.max_discard_sectors, remaining); + bio->bi_size = num_sectors << SECTOR_SHIFT; + remaining -= num_sectors; + } else if (rw & REQ_WRITE_SAME) { + /* + * WRITE SAME only uses a single page. + */ + dp->get_page(dp, &page, &len, &offset); + bio_add_page(bio, page, logical_block_size, offset); + num_sectors = min_t(sector_t, q->limits.max_write_same_sectors, remaining); + bio->bi_size = num_sectors << SECTOR_SHIFT; + + offset = 0; + remaining -= num_sectors; + dp->next_page(dp); } else while (remaining) { /* * Try and add as many pages as possible. |