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-rw-r--r--Documentation/ABI/testing/sysfs-bus-rbd4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-rbd b/Documentation/ABI/testing/sysfs-bus-rbd
index 1cf2adf46b11..cd9213ccf3dc 100644
--- a/Documentation/ABI/testing/sysfs-bus-rbd
+++ b/Documentation/ABI/testing/sysfs-bus-rbd
@@ -70,6 +70,10 @@ snap_*
A directory per each snapshot
+parent
+
+ Information identifying the pool, image, and snapshot id for
+ the parent image in a layered rbd image (format 2 only).
Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
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