Ilya Dryomov f9bebd5803
rbd: kill rbd_is_lock_supported() ...
Currently the exclusive lock is acquired only if the mapping is
writable, i.e. an image HEAD mapped in rw mode. This means that we
don't acquire the lock for executing a read from a snapshot or an image
HEAD mapped in ro mode, even if lock_on_read is set. This is somewhat
weird and inconsistent with "no automatic exclusive lock transfers"
mode, where the lock is acquired unconditionally.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com >
Reviewed-by: Jason Dillaman <dillaman@redhat.com >
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