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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>
93 lines
1.9 KiB
Plaintext
93 lines
1.9 KiB
Plaintext
What: /sys/bus/rbd/
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Date: November 2010
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Contact: Yehuda Sadeh <yehuda@newdream.net>,
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Sage Weil <sage@newdream.net>
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Description:
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Being used for adding and removing rbd block devices.
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Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
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$ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
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The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
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will be assigned for any registered block device. If snapshot is used, it will
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be mapped read-only.
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Removal of a device:
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$ echo <dev-id> > /sys/bus/rbd/remove
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Entries under /sys/bus/rbd/devices/<dev-id>/
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--------------------------------------------
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client_id
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The ceph unique client id that was assigned for this specific session.
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features
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A hexadecimal encoding of the feature bits for this image.
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major
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The block device major number.
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name
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The name of the rbd image.
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image_id
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The unique id for the rbd image. (For rbd image format 1
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this is empty.)
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pool
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The name of the storage pool where this rbd image resides.
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An rbd image name is unique within its pool.
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pool_id
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The unique identifier for the rbd image's pool. This is
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a permanent attribute of the pool. A pool's id will never
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change.
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size
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The size (in bytes) of the mapped block device.
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refresh
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Writing to this file will reread the image header data and set
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all relevant datastructures accordingly.
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current_snap
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The current snapshot for which the device is mapped.
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snap_*
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A directory per each snapshot
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parent
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Information identifying the pool, image, and snapshot id for
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the parent image in a layered rbd image (format 2 only).
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Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
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-------------------------------------------------------------
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snap_id
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The rados internal snapshot id assigned for this snapshot
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snap_size
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The size of the image when this snapshot was taken.
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snap_features
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A hexadecimal encoding of the feature bits for this snapshot.
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