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ff96128fb0
Make /sys/bus/rbd/devices/<id>/parent show the entire chain of parent images. While at it, kernel sprintf() doesn't return negative values, casting to unsigned long long is no longer necessary and there is no good reason to split into multiple sprintf() calls. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Alex Elder <elder@linaro.org>
99 lines
2.5 KiB
Plaintext
99 lines
2.5 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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What: /sys/bus/rbd/add_single_major
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Date: December 2013
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KernelVersion: 3.14
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Contact: Sage Weil <sage@inktank.com>
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Description: Available only if rbd module is inserted with single_major
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parameter set to true.
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Usage is the same as for /sys/bus/rbd/add. If present,
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should be used instead of the latter: any attempts to use
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/sys/bus/rbd/add if /sys/bus/rbd/add_single_major is
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available will fail for backwards compatibility reasons.
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What: /sys/bus/rbd/remove_single_major
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Date: December 2013
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KernelVersion: 3.14
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Contact: Sage Weil <sage@inktank.com>
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Description: Available only if rbd module is inserted with single_major
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parameter set to true.
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Usage is the same as for /sys/bus/rbd/remove. If present,
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should be used instead of the latter: any attempts to use
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/sys/bus/rbd/remove if /sys/bus/rbd/remove_single_major is
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available will fail for backwards compatibility reasons.
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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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minor
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The block device minor number. (December 2013, since 3.14.)
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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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parent
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Information identifying the chain of parent images in a layered rbd
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image. Entries are separated by empty lines.
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