BTRFS_SUBVOL_RDONLY
if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
flags |= BTRFS_SUBVOL_RDONLY;
if (flags & ~BTRFS_SUBVOL_RDONLY) {
if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
if (flags & BTRFS_SUBVOL_RDONLY) {
(BTRFS_SUBVOL_RDONLY | \
(BTRFS_SUBVOL_RDONLY | \