Re: [PATCH] cramfs corruption after BLKFLSBUF on loop device

[Olaf Hering <olh@suse.de>]

 On Fri, Jun 02, Andrew Morton wrote:

> Oh, OK, we cannot use read_cache_page().  Because the above is still racy
> (and still needs the retry loop).  We need to set PG_checked before
> launching the read.  Something like:
> 
> /*
>  * Return a locked, uptodate, !PagePrivate, !PageChecked page which needs a
>  * single put_page by the caller.
>  */
> cramfs_read_getpage()
> {
> 	page = find_lock_page()
> 	if (PageUptodate(page))
> 		return page;
> 	SetPagePrivate()
> 	SetPageChecked()
> 	err = m->a_ops->readpage(page);

I guess we have to put a find_or_create_page in there, and fill it.
Will try that tomorrow.