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rbd: support for exclusive-lock feature
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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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idryomov committed Aug 24, 2016
1 parent 99d1694 commit ed95b21
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