C++ (Cpp) truncate_partial_data_page Examples

Example #1

File: file.c Project: davidnguyenwm/Hulk-Kernel

int truncate_blocks(struct inode *inode, u64 from, bool lock)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
	int count = 0, err = 0;
	struct page *ipage;

	trace_f2fs_truncate_blocks_enter(inode, from);

	free_from = (pgoff_t)F2FS_BYTES_TO_BLK(from + blocksize - 1);

	if (lock)
		f2fs_lock_op(sbi);

	ipage = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage)) {
		err = PTR_ERR(ipage);
		goto out;
	}

	if (f2fs_has_inline_data(inode)) {
		f2fs_put_page(ipage, 1);
		goto out;
	}

	set_new_dnode(&dn, inode, ipage, NULL, 0);
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
	if (err) {
		if (err == -ENOENT)
			goto free_next;
		goto out;
	}

	count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));

	count -= dn.ofs_in_node;
	f2fs_bug_on(sbi, count < 0);

	if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
		truncate_data_blocks_range(&dn, count);
		free_from += count;
	}

	f2fs_put_dnode(&dn);
free_next:
	err = truncate_inode_blocks(inode, free_from);
out:
	if (lock)
		f2fs_unlock_op(sbi);

	/* lastly zero out the first data page */
	if (!err)
		err = truncate_partial_data_page(inode, from);

	trace_f2fs_truncate_blocks_exit(inode, err);
	return err;
}

Example #2

static int f2fs_ioc_release_volatile_write(struct file *filp)
{
	struct inode *inode = file_inode(filp);

	if (!inode_owner_or_capable(inode))
		return -EACCES;

	if (!f2fs_is_volatile_file(inode))
		return 0;

	if (!f2fs_is_first_block_written(inode))
		return truncate_partial_data_page(inode, 0, true);

	return punch_hole(inode, 0, F2FS_BLKSIZE);
}

Example #3

File: file.c Project: sjtutravel/hmfs

static int truncate_blocks(struct inode *inode, u64 from)
{
	struct dnode_of_data dn;
	struct hmfs_sb_info *sbi = HMFS_SB(inode->i_sb);
	int count, err;
	u64 free_from;
	int ilock;

	free_from = (from + HMFS_PAGE_SIZE - 1) >> HMFS_PAGE_SIZE_BITS;

	ilock = mutex_lock_op(sbi);

	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);

	if (err) {
		goto free_next;
	}
	if (!dn.level)
		count = NORMAL_ADDRS_PER_INODE;
	else
		count = ADDRS_PER_BLOCK;

	count -= dn.ofs_in_node;
	BUG_ON(count < 0);

	if (dn.ofs_in_node || !dn.level) {
		truncate_data_blocks_range(&dn, count);
		free_from += count;
	}

free_next:err = truncate_inode_blocks(inode, free_from);
	truncate_partial_data_page(inode, from);

	mutex_unlock_op(sbi, ilock);
	return err;
}