diff --git a/utils/src/format.h b/utils/src/format.h
index 6c667c97..dc83c506 100644
--- a/utils/src/format.h
+++ b/utils/src/format.h
@@ -683,6 +683,7 @@ enum {
 	SCOUTFS_NET_CMD_ALLOC_INODES,
 	SCOUTFS_NET_CMD_GET_LOG_TREES,
 	SCOUTFS_NET_CMD_COMMIT_LOG_TREES,
+	SCOUTFS_NET_CMD_GET_FS_ROOTS,
 	SCOUTFS_NET_CMD_ADVANCE_SEQ,
 	SCOUTFS_NET_CMD_GET_LAST_SEQ,
 	SCOUTFS_NET_CMD_STATFS,
@@ -731,6 +732,11 @@ struct scoutfs_net_statfs {
 	__u8 uuid[SCOUTFS_UUID_BYTES];	/* logical volume uuid */
 } __packed;
 
+struct scoutfs_net_fs_roots {
+	struct scoutfs_btree_root fs_root;
+	struct scoutfs_btree_root logs_root;
+} __packed;
+
 struct scoutfs_net_lock {
 	struct scoutfs_key key;
 	__le64 write_version;
@@ -738,6 +744,11 @@ struct scoutfs_net_lock {
 	__u8 new_mode;
 } __packed;
 
+struct scoutfs_net_lock_grant_response {
+	struct scoutfs_net_lock nl;
+	struct scoutfs_net_fs_roots nfr;
+} __packed;
+
 struct scoutfs_net_lock_recover {
 	__le16 nr;
 	struct scoutfs_net_lock locks[0];