[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <alpine.LFD.2.20.1611070156420.21293@casper.infradead.org>
Date: Mon, 7 Nov 2016 01:56:56 +0000 (GMT)
From: James Simmons <jsimmons@...radead.org>
To: Oleg Drokin <green@...uxhacker.ru>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
devel@...verdev.osuosl.org,
Andreas Dilger <andreas.dilger@...el.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Lustre Development List <lustre-devel@...ts.lustre.org>,
Jinshan Xiong <jinshan.xiong@...el.com>
Subject: Re: [PATCH 13/14] staging/lustre/llite: do not clear uptodate bit
in page delete
> From: Jinshan Xiong <jinshan.xiong@...el.com>
>
> Otherwise, if the race between page fault and truncate occurs, it
> will cause the page fault routine to return an EIO error.
>
> In filemap_fault() {
> page_not_uptodate:
> ...
> ClearPageError(page);
> error = mapping->a_ops->readpage(file, page);
> if (!error) {
> wait_on_page_locked(page);
> if (!PageUptodate(page))
> error = -EIO;
> }
> ...
> }
>
> However, I tend to think this is a defect in kernel implementation,
> because it assumes PageUptodate shouldn't be cleared but file read
> routine doesn't make the same assumption.
Reviewed-by: James Simmons <jsimmons@...radead.org>
> Signed-off-by: Jinshan Xiong <jinshan.xiong@...el.com>
> Reviewed-on: http://review.whamcloud.com/22827
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8633
> Reviewed-by: Li Dongyang <dongyang.li@....edu.au>
> Reviewed-by: Bobi Jam <bobijam@...mail.com>
> Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
> ---
> drivers/staging/lustre/lustre/llite/vvp_page.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/staging/lustre/lustre/llite/vvp_page.c b/drivers/staging/lustre/lustre/llite/vvp_page.c
> index 25490a5..23d6630 100644
> --- a/drivers/staging/lustre/lustre/llite/vvp_page.c
> +++ b/drivers/staging/lustre/lustre/llite/vvp_page.c
> @@ -166,7 +166,6 @@ static void vvp_page_delete(const struct lu_env *env,
> refc = atomic_dec_return(&page->cp_ref);
> LASSERTF(refc >= 1, "page = %p, refc = %d\n", page, refc);
>
> - ClearPageUptodate(vmpage);
> ClearPagePrivate(vmpage);
> vmpage->private = 0;
> /*
> --
> 2.7.4
>
>
Powered by blists - more mailing lists