linux-kernel - Re: [PATCH 1/3] mm: print out information of file affected by memory error

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Message-ID: <20121025193249.GC3262@quack.suse.cz>
Date:	Thu, 25 Oct 2012 21:32:49 +0200
From:	Jan Kara <jack@...e.cz>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andi Kleen <andi.kleen@...el.com>, Tony Luck <tony.luck@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>,
	Jun'ichi Nomura <j-nomura@...jp.nec.com>,
	Akira Fujita <a-fujita@...jp.nec.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3] mm: print out information of file affected by
 memory error

On Thu 25-10-12 11:12:47, Naoya Horiguchi wrote:
> Printing out the information about which file can be affected by a
> memory error in generic_error_remove_page() is helpful for user to
> estimate the impact of the error.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  mm/truncate.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git v3.7-rc2.orig/mm/truncate.c v3.7-rc2/mm/truncate.c
> index d51ce92..df0c6ab7 100644
> --- v3.7-rc2.orig/mm/truncate.c
> +++ v3.7-rc2/mm/truncate.c
> @@ -151,14 +151,20 @@ int truncate_inode_page(struct address_space *mapping, struct page *page)
>   */
>  int generic_error_remove_page(struct address_space *mapping, struct page *page)
>  {
> +	int ret;
> +	struct inode *inode = mapping->host;
> +
  This will oops if mapping == NULL. Currently the only caller seems to
check beforehand but still, it's better keep the code as robust as it it.

>  	if (!mapping)
>  		return -EINVAL;
>  	/*
>  	 * Only punch for normal data pages for now.
>  	 * Handling other types like directories would need more auditing.
>  	 */
> -	if (!S_ISREG(mapping->host->i_mode))
> +	if (!S_ISREG(inode->i_mode))
>  		return -EIO;
> +	pr_info("MCE %#lx: file info pgoff:%lu, inode:%lu, dev:%s\n",
> +		page_to_pfn(page), page_index(page),
> +		inode->i_ino, inode->i_sb->s_id);
>  	return truncate_inode_page(mapping, page);
>  }
>  EXPORT_SYMBOL(generic_error_remove_page);
  Otherwise the patch looks OK.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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