lfs_fits
if (!lfs_fits(fs, frags)) {
!lfs_fits(fs, fsb + fs->lfs_ravail + fs->lfs_favail)) {
if (lfs_fits(fs, fsb + fs->lfs_ravail + fs->lfs_favail))
while (!lfs_fits(fs, fsb)) {
int lfs_fits(struct lfs *, int);