[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 953fa134cd3db78cff006ce37931fd6a089fe8ba..cb4afac9d0b54243a62095f94344991d7a82da8a 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  \