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-rw-r--r--include/linux/crush/crush.h6
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;
};