+ struct ll_fiemap_info_key *fm_key =
+ (struct ll_fiemap_info_key *)key;
+ struct ldlm_res_id res_id;
+ ldlm_policy_data_t policy;
+ struct lustre_handle lockh;
+ ldlm_mode_t mode = 0;
+ struct ptlrpc_request *req;
+ struct ll_user_fiemap *reply;
+ char *tmp;
+ int rc;
+
+ if (!(fm_key->fiemap.fm_flags & FIEMAP_FLAG_SYNC))
+ goto skip_locking;
+
+ policy.l_extent.start = fm_key->fiemap.fm_start &
+ CFS_PAGE_MASK;
+
+ if (OBD_OBJECT_EOF - fm_key->fiemap.fm_length <=
+ fm_key->fiemap.fm_start + PAGE_CACHE_SIZE - 1)
+ policy.l_extent.end = OBD_OBJECT_EOF;
+ else
+ policy.l_extent.end = (fm_key->fiemap.fm_start +
+ fm_key->fiemap.fm_length +
+ PAGE_CACHE_SIZE - 1) & CFS_PAGE_MASK;
+
+ ostid_build_res_name(&fm_key->oa.o_oi, &res_id);
+ mode = ldlm_lock_match(exp->exp_obd->obd_namespace,
+ LDLM_FL_BLOCK_GRANTED |
+ LDLM_FL_LVB_READY,
+ &res_id, LDLM_EXTENT, &policy,
+ LCK_PR | LCK_PW, &lockh, 0);
+ if (mode) { /* lock is cached on client */
+ if (mode != LCK_PR) {
+ ldlm_lock_addref(&lockh, LCK_PR);
+ ldlm_lock_decref(&lockh, LCK_PW);
+ }
+ } else { /* no cached lock, needs acquire lock on server side */
+ fm_key->oa.o_valid |= OBD_MD_FLFLAGS;
+ fm_key->oa.o_flags |= OBD_FL_SRVLOCK;
+ }