BTRFS_ROOT_SUBVOL_RDONLY
return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
root_flags |= BTRFS_ROOT_SUBVOL_RDONLY;
root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY;
if (!(root_flags & BTRFS_ROOT_SUBVOL_RDONLY)) {
const u64 valid_root_flags = BTRFS_ROOT_SUBVOL_RDONLY |