linux-kernel - Re: [PATCH 1/6] afs: Fix afs_launder_page() to set correct start file position

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Date:   Tue, 24 Aug 2021 15:18:57 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Jeffrey Altman <jaltman@...istor.com>,
        linux-afs@...ts.infradead.org, Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        devel@...ts.orangefs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] afs: Fix afs_launder_page() to set correct start
 file position

On Tue, Aug 24, 2021 at 02:24:47PM +0100, David Howells wrote:
> +++ b/fs/afs/write.c
> @@ -950,8 +950,8 @@ int afs_launder_page(struct page *page)
>  		iov_iter_bvec(&iter, WRITE, bv, 1, bv[0].bv_len);
>  
>  		trace_afs_page_dirty(vnode, tracepoint_string("launder"), page);
> -		ret = afs_store_data(vnode, &iter, (loff_t)page->index * PAGE_SIZE,
> -				     true);
> +		ret = afs_store_data(vnode, &iter,
> +				     (loff_t)page->index * PAGE_SIZE + f, true);

This could be page_offset(page), which reads better to me:

		ret = afs_store_data(vnode, &iter, page_offset(page) + f, true);