static int v9fs_write_inode(struct inode *inode,
			    struct writeback_control *wbc)
{
	int ret;
	struct p9_wstat wstat;
	struct v9fs_inode *v9inode;
	/*
	 * send an fsync request to server irrespective of
	 * wbc->sync_mode.
	 */
	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
	v9inode = V9FS_I(inode);
	if (!v9inode->writeback_fid)
		return 0;
	v9fs_blank_wstat(&wstat);

	ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
	if (ret < 0) {
		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
		return ret;
	}
	return 0;
}
static int v9fs_write_inode(struct inode *inode,
			    struct writeback_control *wbc)
{
	int ret;
	struct p9_wstat wstat;
	struct v9fs_inode *v9inode;
	 
	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
	v9inode = V9FS_I(inode);
	if (!v9inode->writeback_fid)
		return 0;
	v9fs_blank_wstat(&wstat);

	ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
	if (ret < 0) {
		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
		return ret;
	}
	return 0;
}