f2fs_do_truncate_blocks
return f2fs_do_truncate_blocks(inode, from, lock);
return f2fs_do_truncate_blocks(inode, round_up(from, PAGE_SIZE), lock);
int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock);
ret = f2fs_do_truncate_blocks(fi->cow_inode, 0, true);
err = f2fs_do_truncate_blocks(inode, free_from, lock);
f2fs_do_truncate_blocks(inode, start_index * PAGE_SIZE, false);