int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
{
	handle_t *handle;
	int inline_size, value_len, needed_blocks, no_expand, err = 0;
	size_t i_size;
	void *value = NULL;
	struct ext4_xattr_ibody_find is = {
		.s = { .not_found = -ENODATA, },
	};
	struct ext4_xattr_info i = {
		.name_index = EXT4_XATTR_INDEX_SYSTEM,
		.name = EXT4_XATTR_SYSTEM_DATA,
	};


	needed_blocks = ext4_writepage_trans_blocks(inode);
	handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	ext4_write_lock_xattr(inode, &no_expand);
	if (!ext4_has_inline_data(inode)) {
		*has_inline = 0;
		ext4_journal_stop(handle);
		return 0;
	}

	if ((err = ext4_orphan_add(handle, inode)) != 0)
		goto out;

	if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
		goto out;

	down_write(&EXT4_I(inode)->i_data_sem);
	i_size = inode->i_size;
	inline_size = ext4_get_inline_size(inode);
	EXT4_I(inode)->i_disksize = i_size;

	if (i_size < inline_size) {
		/* Clear the content in the xattr space. */
		if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
			if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
				goto out_error;

			BUG_ON(is.s.not_found);

			value_len = le32_to_cpu(is.s.here->e_value_size);
			value = kmalloc(value_len, GFP_NOFS);
			if (!value) {
				err = -ENOMEM;
				goto out_error;
			}

			err = ext4_xattr_ibody_get(inode, i.name_index,
						   i.name, value, value_len);
			if (err <= 0)
				goto out_error;

			i.value = value;
			i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
					i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
			err = ext4_xattr_ibody_inline_set(handle, inode,
							  &i, &is);
			if (err)
				goto out_error;
		}

		/* Clear the content within i_blocks. */
		if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
			void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
			memset(p + i_size, 0,
			       EXT4_MIN_INLINE_DATA_SIZE - i_size);
		}

		EXT4_I(inode)->i_inline_size = i_size <
					EXT4_MIN_INLINE_DATA_SIZE ?
					EXT4_MIN_INLINE_DATA_SIZE : i_size;
	}

out_error:
	up_write(&EXT4_I(inode)->i_data_sem);
out:
	brelse(is.iloc.bh);
	ext4_write_unlock_xattr(inode, &no_expand);
	kfree(value);
	if (inode->i_nlink)
		ext4_orphan_del(handle, inode);

	if (err == 0) {
		inode->i_mtime = inode->i_ctime = current_time(inode);
		err = ext4_mark_inode_dirty(handle, inode);
		if (IS_SYNC(inode))
			ext4_handle_sync(handle);
	}
	ext4_journal_stop(handle);
	return err;
}
Unknown