diff options
Diffstat (limited to 'include/linux/crush')
| -rw-r--r-- | include/linux/crush/crush.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h index acaa5615d634..75f36a6c7f67 100644 --- a/include/linux/crush/crush.h +++ b/include/linux/crush/crush.h @@ -173,6 +173,12 @@ struct crush_map { * apply to a collision: in that case we will retry as we used * to. */ __u32 chooseleaf_descend_once; + + /* if non-zero, feed r into chooseleaf, bit-shifted right by (r-1) + * bits. a value of 1 is best for new clusters. for legacy clusters + * that want to limit reshuffling, a value of 3 or 4 will make the + * mappings line up a bit better with previous mappings. */ + __u8 chooseleaf_vary_r; }; |