lustre/mdc: Check for all attributes validity in revalidate

		fid_build_reg_res_name(fid, &res_id);

		switch (it->it_op) {

		case IT_GETATTR:

			policy.l_inodebits.bits = MDS_INODELOCK_UPDATE;

			/* File attributes are held under multiple bits:

			 * nlink is under lookup lock, size and times are

			 * under UPDATE lock and recently we've also got

			 * a separate permissions lock for owner/group/acl that

			 * were protected by lookup lock before.

			 * Getattr must provide all of that information,

			 * so we need to ensure we have all of those locks.

			 * Unfortunately, if the bits are split across multiple

			 * locks, there's no easy way to match all of them here,

			 * so an extra RPC would be performed to fetch all

			 * of those bits at once for now. */

			policy.l_inodebits.bits = MDS_INODELOCK_UPDATE |

						  MDS_INODELOCK_LOOKUP |

						  MDS_INODELOCK_PERM;

			break;

		case IT_LAYOUT:

			policy.l_inodebits.bits = MDS_INODELOCK_LAYOUT;

			policy.l_inodebits.bits = MDS_INODELOCK_LOOKUP;

			break;

		}

		mode = ldlm_lock_match(exp->exp_obd->obd_namespace,

				       LDLM_FL_BLOCK_GRANTED, &res_id,

				       LDLM_IBITS, &policy,