- size = sizeof(*data);
- err = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_CONN_DATA),
- KEY_CONN_DATA, &size, data, NULL);
- if (err) {
- CERROR("Get connect data failed: %d \n", err);
- GOTO(out_md, err);
- }
+ /* For mount, we only need fs info from MDT0, and also in DNE, it
+ * can make sure the client can be mounted as long as MDT0 is
+ * avaible */
+ err = obd_statfs(NULL, sbi->ll_md_exp, osfs,
+ cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
+ OBD_STATFS_FOR_MDT0);
+ if (err)
+ GOTO(out_md_fid, err);
+
+ /* This needs to be after statfs to ensure connect has finished.
+ * Note that "data" does NOT contain the valid connect reply.
+ * If connecting to a 1.8 server there will be no LMV device, so
+ * we can access the MDC export directly and exp_connect_flags will
+ * be non-zero, but if accessing an upgraded 2.1 server it will
+ * have the correct flags filled in.
+ * XXX: fill in the LMV exp_connect_flags from MDC(s). */
+ valid = exp_connect_flags(sbi->ll_md_exp) & CLIENT_CONNECT_MDT_REQD;
+ if (exp_connect_flags(sbi->ll_md_exp) != 0 &&
+ valid != CLIENT_CONNECT_MDT_REQD) {
+ char *buf;
+
+ OBD_ALLOC_WAIT(buf, CFS_PAGE_SIZE);
+ obd_connect_flags2str(buf, CFS_PAGE_SIZE,
+ valid ^ CLIENT_CONNECT_MDT_REQD, ",");
+ LCONSOLE_ERROR_MSG(0x170, "Server %s does not support "
+ "feature(s) needed for correct operation "
+ "of this client (%s). Please upgrade "
+ "server or downgrade client.\n",
+ sbi->ll_md_exp->exp_obd->obd_name, buf);
+ OBD_FREE(buf, CFS_PAGE_SIZE);
+ GOTO(out_md_fid, err = -EPROTO);
+ }