NFS: Allow files that are open for write to invalidate caches

	ctx->mode = filp->f_mode;

	nfs_file_set_open_context(filp, ctx);

	put_nfs_open_context(ctx);

	if ((filp->f_mode & FMODE_WRITE) != 0)

		nfs_begin_data_update(inode);

	return 0;

}

int nfs_release(struct inode *inode, struct file *filp)

{

	if ((filp->f_mode & FMODE_WRITE) != 0)

		nfs_end_data_update(inode);

	nfs_file_clear_open_context(filp);

	return 0;

}