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rbd: support for exclusive-lock feature
Add basic support for RBD_FEATURE_EXCLUSIVE_LOCK feature. Maintenance operations (resize, snapshot create, etc) are offloaded to librbd via returning -EOPNOTSUPP - librbd should request the lock and execute the operation. Signed-off-by: Ilya Dryomov <[email protected]> Reviewed-by: Mike Christie <[email protected]> Tested-by: Mike Christie <[email protected]>
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