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path: root/drivers/md/dm.c
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Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c44
1 files changed, 39 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 77e6eff41ca..5401cdce0fc 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1174,7 +1174,28 @@ static void __clone_and_map_simple(struct clone_info *ci, struct dm_target *ti)
ci->sector_count = 0;
}
-static int __clone_and_map_discard(struct clone_info *ci)
+typedef unsigned (*get_num_requests_fn)(struct dm_target *ti);
+
+static unsigned get_num_discard_requests(struct dm_target *ti)
+{
+ return ti->num_discard_requests;
+}
+
+static unsigned get_num_write_same_requests(struct dm_target *ti)
+{
+ return ti->num_write_same_requests;
+}
+
+typedef bool (*is_split_required_fn)(struct dm_target *ti);
+
+static bool is_split_required_for_discard(struct dm_target *ti)
+{
+ return ti->split_discard_requests;
+}
+
+static int __clone_and_map_changing_extent_only(struct clone_info *ci,
+ get_num_requests_fn get_num_requests,
+ is_split_required_fn is_split_required)
{
struct dm_target *ti;
sector_t len;
@@ -1185,15 +1206,15 @@ static int __clone_and_map_discard(struct clone_info *ci)
return -EIO;
/*
- * Even though the device advertised discard support,
- * that does not mean every target supports it, and
+ * Even though the device advertised support for this type of
+ * request, that does not mean every target supports it, and
* reconfiguration might also have changed that since the
* check was performed.
*/
- if (!ti->num_discard_requests)
+ if (!get_num_requests || !get_num_requests(ti))
return -EOPNOTSUPP;
- if (!ti->split_discard_requests)
+ if (is_split_required && !is_split_required(ti))
len = min(ci->sector_count, max_io_len_target_boundary(ci->sector, ti));
else
len = min(ci->sector_count, max_io_len(ci->sector, ti));
@@ -1206,6 +1227,17 @@ static int __clone_and_map_discard(struct clone_info *ci)
return 0;
}
+static int __clone_and_map_discard(struct clone_info *ci)
+{
+ return __clone_and_map_changing_extent_only(ci, get_num_discard_requests,
+ is_split_required_for_discard);
+}
+
+static int __clone_and_map_write_same(struct clone_info *ci)
+{
+ return __clone_and_map_changing_extent_only(ci, get_num_write_same_requests, NULL);
+}
+
static int __clone_and_map(struct clone_info *ci)
{
struct bio *bio = ci->bio;
@@ -1215,6 +1247,8 @@ static int __clone_and_map(struct clone_info *ci)
if (unlikely(bio->bi_rw & REQ_DISCARD))
return __clone_and_map_discard(ci);
+ else if (unlikely(bio->bi_rw & REQ_WRITE_SAME))
+ return __clone_and_map_write_same(ci);
ti = dm_table_find_target(ci->map, ci->sector);
if (!dm_target_is_valid(ti))