is_ancestor      3577 fs/btrfs/send.c static int is_ancestor(struct btrfs_root *root,
is_ancestor      1023 fs/gfs2/super.c static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
is_ancestor       316 kernel/seccomp.c static int is_ancestor(struct seccomp_filter *parent,