From: Alasdair G Kergon <[email-masked]>

When processing write same requests, fix dm to send the configured
number of WRITE SAME requests to the target rather than the number of
discards, which is not always the same.

Device-mapper WRITE SAME support was introduced by commit
23508a96cd2e857d57044a2ed7d305f2d9daf441 ("dm: add WRITE SAME support").

Signed-off-by: Alasdair G Kergon <[email-masked]>
Acked-by: Mike Snitzer <[email-masked]>
---
 drivers/md/dm.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux/drivers/md/dm.c
===================================================================
--- linux.orig/drivers/md/dm.c
+++ linux/drivers/md/dm.c
@@ -1188,6 +1188,7 @@ static int __clone_and_map_changing_exte
 {
 	struct dm_target *ti;
 	sector_t len;
+	unsigned num_requests;
 
 	do {
 		ti = dm_table_find_target(ci->map, ci->sector);
@@ -1200,7 +1201,8 @@ static int __clone_and_map_changing_exte
 		 * reconfiguration might also have changed that since the
 		 * check was performed.
 		 */
-		if (!get_num_requests || !get_num_requests(ti))
+		num_requests = get_num_requests ? get_num_requests(ti) : 0;
+		if (!num_requests)
 			return -EOPNOTSUPP;
 
 		if (is_split_required && !is_split_required(ti))
@@ -1208,7 +1210,7 @@ static int __clone_and_map_changing_exte
 		else
 			len = min(ci->sector_count, max_io_len(ci->sector, ti));
 
-		__issue_target_requests(ci, ti, ti->num_discard_requests, len);
+		__issue_target_requests(ci, ti, num_requests, len);
 
 		ci->sector += len;
 	} while (ci->sector_count -= len);