[DO NOT MERGE] rbd: bump RBD_MAX_PARENT_CHAIN_LEN to 128

Bump RBD_MAX_PARENT_CHAIN_LEN from 16 to 128 to avoid fsx failures.

(The alternative is changing fsx to flatten unconditionally when the
limit of 16 is reached, which is ugly and not needed for librbd.)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 94709466ad19f58b628c9b5691269e22fc856661..e95ee3ef34fa02fdfa944e6d494477193f37ee8b 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -89,7 +89,7 @@ static int atomic_dec_return_safe(atomic_t *v)
 #define RBD_MINORS_PER_MAJOR           256
 #define RBD_SINGLE_MAJOR_PART_SHIFT    4
 
-#define RBD_MAX_PARENT_CHAIN_LEN       16
+#define RBD_MAX_PARENT_CHAIN_LEN       128
 
 #define RBD_SNAP_DEV_NAME_PREFIX       "snap_"
 #define RBD_MAX_SNAP_NAME_LEN  \