v7fs_datablock_addr
if (v7fs_datablock_addr(ofs, &map) != 0)
v7fs_datablock_addr(old_filesize, &oldmap);
v7fs_datablock_addr(old_filesize + (i+1) * V7FS_BSIZE, &newmap);
v7fs_datablock_addr(old_filesize, &oldmap);
v7fs_datablock_addr(old_filesize - (i+1) * V7FS_BSIZE, &newmap);
int v7fs_datablock_addr(size_t, struct v7fs_daddr_map *);
if ((error = v7fs_datablock_addr(sz, &map))) {