Merge tag 'dm-3.8-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm

Pull more device-mapper fixes from Alasdair G Kergon:
 "A fix for stacked dm thin devices and a fix for the new dm WRITE SAME
  support."

* tag 'dm-3.8-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
  dm: fix write same requests counting
  dm thin: fix queue limits stacking

2 files changed, 5 insertions, 14 deletions

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 675ae5274016..5409607d4875 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2746,19 +2746,9 @@ static int thin_iterate_devices(struct dm_target *ti,
         return 0;
 }
 
-/*
- * A thin device always inherits its queue limits from its pool.
- */
-static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits)
-{
-        struct thin_c *tc = ti->private;
-
-        *limits = bdev_get_queue(tc->pool_dev->bdev)->limits;
-}
-
 static struct target_type thin_target = {
         .name = "thin",
-        .version = {1, 6, 0},
+        .version = {1, 7, 0},
         .module = THIS_MODULE,
         .ctr = thin_ctr,
         .dtr = thin_dtr,
@@ -2767,7 +2757,6 @@ static struct target_type thin_target = {
         .postsuspend = thin_postsuspend,
         .status = thin_status,
         .iterate_devices = thin_iterate_devices,
-        .io_hints = thin_io_hints,
 };
 
 /*----------------------------------------------------------------*/
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c72e4d5a9617..314a0e2faf79 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1188,6 +1188,7 @@ static int __clone_and_map_changing_extent_only(struct clone_info *ci,
 {
         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_extent_only(struct clone_info *ci,
                  * 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_extent_only(struct clone_info *ci,
                 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);