btrfs-progs: subvolume-list: use user ino lookup

The user ioctl works in all cases, so don't limit subvolume list to root
by using the root-only ioctl. Subvolume list itself still uses the
root-only tree search ioctl, but this is a step toward making subvolume
list user-capable.

Signed-off-by: Sweet Tea Dorminy <[email protected]>

Author: sweettea

cmds/subvolume-list.c

@@ -769,7 +769,7 @@ static int resolve_root(struct rb_root *rl, struct root_info *ri,
  */
 static int lookup_ino_path(int fd, struct root_info *ri)
 {
-	struct btrfs_ioctl_ino_lookup_args args;
+	struct btrfs_ioctl_ino_lookup_user_args args;
 	int ret;
 
 	if (ri->path)
@@ -780,9 +780,9 @@ static int lookup_ino_path(int fd, struct root_info *ri)
 
 	memset(&args, 0, sizeof(args));
 	args.treeid = ri->ref_tree;
-	args.objectid = ri->dir_id;
+	args.dirid = ri->dir_id;
 
-	ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
+	ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP_USER, &args);
 	if (ret < 0) {
 		if (errno == ENOENT) {
 			ri->ref_tree = 0;
@@ -792,6 +792,12 @@ static int lookup_ino_path(int fd, struct root_info *ri)
 		return ret;
 	}
 
+	ri->path = malloc(strlen(args.name) + strlen(args.path) + 1);
+	if (!ri->path) {
+		error_msg(ERROR_MSG_MEMORY, NULL);
+		exit(1);
+	}
+
 	if (args.name[0]) {
 		/*
 		 * we're in a subdirectory of ref_tree, the kernel ioctl