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86b00e0da6
Add support for getting the the information identifying the parent image for rbd images that have them. The child image holds a reference to its parent image specification structure. Create a new entry "parent" in /sys/bus/rbd/image/N/ to report the identifying information for the parent image, if any. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
1.9 KiB
1.9 KiB
What: /sys/bus/rbd/ Date: November 2010 Contact: Yehuda Sadeh yehuda@newdream.net, Sage Weil sage@newdream.net Description:
Being used for adding and removing rbd block devices.
Usage: [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 will be assigned for any registered block device. If snapshot is used, it will be mapped read-only.
Removal of a device:
$ echo > /sys/bus/rbd/remove
Entries under /sys/bus/rbd/devices//
client_id
The ceph unique client id that was assigned for this specific session.
features
A hexadecimal encoding of the feature bits for this image.
major
The block device major number.
name
The name of the rbd image.
image_id
The unique id for the rbd image. (For rbd image format 1
this is empty.)
pool
The name of the storage pool where this rbd image resides.
An rbd image name is unique within its pool.
pool_id
The unique identifier for the rbd image's pool. This is
a permanent attribute of the pool. A pool's id will never
change.
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.
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//snap_
snap_id
The rados internal snapshot id assigned for this snapshot
snap_size
The size of the image when this snapshot was taken.
snap_features
A hexadecimal encoding of the feature bits for this snapshot.