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ceph: try to choose the auth MDS if possible for getattr
If any 'x' caps is issued we can just choose the auth MDS instead of the random replica MDSes. Because only when the Locker is in LOCK_EXEC state will the loner client could get the 'x' caps. And if we send the getattr requests to any replica MDS it must auth pin and tries to rdlock from the auth MDS, and then the auth MDS need to do the Locker state transition to LOCK_SYNC. And after that the lock state will change back. This cost much when doing the Locker state transition and usually will need to revoke caps from clients. URL: https://tracker.ceph.com/issues/55240 Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Xiubo Li <xiubli@redhat.com>
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