linux-kernel - Re: [PATCH 2/3] afs: Fix afs_write

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Message-ID: <YMdpxbYafHnE0F8N@casper.infradead.org>
Date:   Mon, 14 Jun 2021 15:37:57 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     jlayton@...nel.org, linux-afs@...ts.infradead.org,
        ceph-devel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] afs: Fix afs_write_end() to handle short writes

On Mon, Jun 14, 2021 at 02:20:25PM +0100, David Howells wrote:
> @@ -135,8 +145,6 @@ int afs_write_end(struct file *file, struct address_space *mapping,
>  		write_sequnlock(&vnode->cb_lock);
>  	}
>  
> -	ASSERT(PageUptodate(page));
> -
>  	if (PagePrivate(page)) {
>  		priv = page_private(page);
>  		f = afs_page_dirty_from(page, priv);

Why are you removing this assertion?  Does AFS now support dirty,
partially-uptodate pages?  If so, a subsequent read() to that
page is going to need to be careful to only read the parts of the page
from the server that haven't been written ...