lfs_match_indir
lfs_gather(fs, sp, vp, lfs_match_indir);
int lfs_match_indir(struct lfs *, struct ubuf *);
int lfs_match_indir(struct lfs *, struct buf *);
lfs_gather(fs, fs->lfs_sp, vp, lfs_match_indir);
lfs_gather(fs, sp, vp, lfs_match_indir);