btrfs-util: convert O_PATH if necessary, in btrfs quota call

Fixes: #25468

src/shared/btrfs-util.c

@@ -1765,6 +1765,7 @@ int btrfs_qgroup_find_parents(int fd, uint64_t qgroupid, uint64_t **ret) {
 
 int btrfs_subvol_auto_qgroup_fd(int fd, uint64_t subvol_id, bool insert_intermediary_qgroup) {
         _cleanup_free_ uint64_t *qgroups = NULL;
+        _cleanup_close_ int real_fd = -1;
         uint64_t parent_subvol;
         bool changed = false;
         int n = 0, r;
@@ -1808,6 +1809,11 @@ int btrfs_subvol_auto_qgroup_fd(int fd, uint64_t subvol_id, bool insert_intermed
          * qgroup that then includes all its own child subvolumes.
          */
 
+        /* Turn this into a proper fd, if it is currently O_PATH */
+        fd = fd_reopen_condition(fd, O_RDONLY|O_CLOEXEC, O_PATH, &real_fd);
+        if (fd < 0)
+                return fd;
+
         if (subvol_id == 0) {
                 r = btrfs_is_subvol_fd(fd);
                 if (r < 0)