ffs_isblock
extern int ffs_isblock(struct fs *, u_char *, ufs_daddr_t);
if (ffs_isblock(fs, blksfree, fragstoblks(fs, bpref))) {
if (ffs_isblock(fs, blksfree, bno + i)) {
if (!ffs_isblock(fs, blksfree, got - run + i))
if (ffs_isblock(fs, blksfree, blkno)) {
free = ffs_isblock(fs, blksfree, fragstoblks(fs, bno));
int ffs_isblock(struct fs *, u_char *, ufs_daddr_t);
if (ffs_isblock(fs, blksfree_swap, fragstoblks(fs, bno)))
if (ffs_isblock(fs, cg_blksfree_swap(cgp, needswap), fragno)) {
int ffs_isblock(struct fs *, u_char *, int32_t);