[PATCH 3/3] rbd: document rbd-specific options

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osd_full_behavior only affects rbd, so document it along with
read-only and read-write.

Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
---
 Documentation/ABI/testing/sysfs-bus-rbd |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-rbd b/Documentation/ABI/testing/sysfs-bus-rbd
index 0a30647..15f3ba6 100644
--- a/Documentation/ABI/testing/sysfs-bus-rbd
+++ b/Documentation/ABI/testing/sysfs-bus-rbd
@@ -18,6 +18,25 @@ Removal of a device:
 
   $ echo <dev-id> > /sys/bus/rbd/remove
 
+Options
+-------
+
+read_only/ro
+
+	The mapped device will only handle reads. This is the default for
+	snapshots.
+
+read_write/rw
+
+	The mapped device will handle reads and writes. This is invalid
+	for snapshots.
+
+osd_full_behavior
+
+	Choose how to handle writes to a full ceph cluster. Options are
+	"block" to pause I/O until there is space (the default), or
+	"error", to return an I/O error.
+
 Entries under /sys/bus/rbd/devices/<dev-id>/
 --------------------------------------------
 
-- 
1.7.10.4

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