v7fs_datablock_allocate
if ((error = v7fs_datablock_allocate(fs, &newblk))) {
if ((error = v7fs_datablock_allocate(fs, &idxblk)))
if ((error = v7fs_datablock_allocate(fs, &blk)))
if ((error = v7fs_datablock_allocate(fs, &newblk)))
int v7fs_datablock_allocate(struct v7fs_self *, v7fs_daddr_t *);