[PATCH] dm bio prison: use rb_entry()

[Geliang Tang]

To make the code clearer, use rb_entry() instead of container_of() to
deal with rbtree.

Signed-off-by: Geliang Tang <geliangt...@gmail.com>
---
 drivers/md/dm-bio-prison.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-bio-prison.c b/drivers/md/dm-bio-prison.c
index 03af174..a2c8a9e 100644
--- a/drivers/md/dm-bio-prison.c
+++ b/drivers/md/dm-bio-prison.c
@@ -115,7 +115,7 @@ static int __bio_detain(struct dm_bio_prison *prison,
 
        while (*new) {
                struct dm_bio_prison_cell *cell =
-                       container_of(*new, struct dm_bio_prison_cell, node);
+                       rb_entry(*new, struct dm_bio_prison_cell, node);
 
                r = cmp_keys(key, &cell->key);
 
-- 
2.9.3