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SubjectRe: [PATCH 13/14] staging/lustre/llite: do not clear uptodate bit in page delete

> From: Jinshan Xiong <jinshan.xiong@intel.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@infradead.org>

> Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.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@anu.edu.au>
> Reviewed-by: Bobi Jam <bobijam@hotmail.com>
> Signed-off-by: Oleg Drokin <green@linuxhacker.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
>
>

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