[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 8f441eb8b19265a0ab7658124f0e99ddaa48ffc3..fb41e84ae8d599716919ebfd6d20d1db161e12fc 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  \