rbd: replace the rbd sysfs interface

The new interface creates directories per mapped image
and under each it creates a subdir per available snapshot.
This allows keeping a cleaner interface within the sysfs
guidelines. The ABI documentation was updated too.

Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 83 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-rbd b/Documentation/ABI/testing/sysfs-bus-rbd
new file mode 100644
index 000000000000..90a87e2a572b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-rbd
@@ -0,0 +1,83 @@
+What:           /sys/bus/rbd/
+Date:           November 2010
+Contact:        Yehuda Sadeh <yehuda@hq.newdream.net>,
+                Sage Weil <sage@newdream.net>
+Description:
+
+Being used for adding and removing rbd block devices.
+
+Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
+
+ $ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
+
+The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
+will be assigned for any registered block device. If snapshot is used, it will
+be mapped read-only.
+
+Removal of a device:
+
+  $ echo <dev-id> > /sys/bus/rbd/remove
+
+Entries under /sys/bus/rbd/devices/<dev-id>/
+--------------------------------------------
+
+client_id
+
+        The ceph unique client id that was assigned for this specific session.
+
+major
+
+        The block device major number.
+
+name
+
+        The name of the rbd image.
+
+pool
+
+        The pool where this rbd image resides. The pool-name pair is unique
+        per rados system.
+
+size
+
+        The size (in bytes) of the mapped block device.
+
+refresh
+
+        Writing to this file will reread the image header data and set
+        all relevant datastructures accordingly.
+
+current_snap
+
+        The current snapshot for which the device is mapped.
+
+create_snap
+
+        Create a snapshot:
+
+         $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_create
+
+rollback_snap
+
+        Rolls back data to the specified snapshot. This goes over the entire
+        list of rados blocks and sends a rollback command to each.
+
+         $ echo <snap-name> > /sys/bus/rbd/devices/<dev-id>/snap_rollback
+
+snap_*
+
+        A directory per each snapshot
+
+
+Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
+-------------------------------------------------------------
+
+id
+
+        The rados internal snapshot id assigned for this snapshot
+
+size
+
+        The size of the image when this snapshot was taken.
+
+