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-rw-r--r--drivers/md/dm-io.c23
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.
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