ceph: add global total_caps to count the mdsc's total caps number
This will help to reduce using the global mdsc->mutex lock in many places. Signed-off-by: Xiubo Li <xiubli@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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