linux-ext4 - Re: [PATCH 3/3] ext3: introduce ext3_error_remove

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Message-ID: <20121025194551.GE3262@quack.suse.cz>
Date:	Thu, 25 Oct 2012 21:45:51 +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 3/3] ext3: introduce ext3_error_remove_page

On Thu 25-10-12 11:12:49, Naoya Horiguchi wrote:
> What I suggested in the previous patch for ext4 is ditto with ext3,
> so do the same thing for ext3.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  fs/ext3/inode.c | 33 ++++++++++++++++++++++++++++++---
>  1 file changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git v3.7-rc2.orig/fs/ext3/inode.c v3.7-rc2/fs/ext3/inode.c
> index 7e87e37..7f708bf 100644
> --- v3.7-rc2.orig/fs/ext3/inode.c
> +++ v3.7-rc2/fs/ext3/inode.c
> @@ -1967,6 +1967,33 @@ static int ext3_journalled_set_page_dirty(struct page *page)
>  	return __set_page_dirty_nobuffers(page);
>  }
>  
> +static int ext3_error_remove_page(struct address_space *mapping,
> +				struct page *page)
> +{
> +	struct inode *inode = mapping->host;
> +	struct buffer_head *bh, *head;
> +	ext3_fsblk_t block = 0;
> +
> +	if (!PageDirty(page) || !page_has_buffers(page))
> +		goto remove_page;
> +
> +	/* Lost data. Handle as critical fs error. */
> +	bh = head = page_buffers(page);
> +	do {
> +		if (buffer_dirty(bh)) {
  For ext3, you should check that buffer_mapped() is set because we can
have dirty and unmapped buffers. Otherwise the patch looks OK.

> +			block = bh->b_blocknr;
> +			ext3_error(inode->i_sb, "ext3_error_remove_page",
> +				"inode #%lu: block %lu: "
> +				"Removing dirty pagecache page",
> +				inode->i_ino, block);
> +		}
> +		bh = bh->b_this_page;
> +	} while (bh != head);
> +
> +remove_page:
> +	return generic_error_remove_page(mapping, page);
> +}
> +
>  static const struct address_space_operations ext3_ordered_aops = {
>  	.readpage		= ext3_readpage,
>  	.readpages		= ext3_readpages,
> @@ -1979,7 +2006,7 @@ static const struct address_space_operations ext3_ordered_aops = {
>  	.direct_IO		= ext3_direct_IO,
>  	.migratepage		= buffer_migrate_page,
>  	.is_partially_uptodate  = block_is_partially_uptodate,
> -	.error_remove_page	= generic_error_remove_page,
> +	.error_remove_page	= ext3_error_remove_page,
>  };
>  
>  static const struct address_space_operations ext3_writeback_aops = {
> @@ -1994,7 +2021,7 @@ static const struct address_space_operations ext3_writeback_aops = {
>  	.direct_IO		= ext3_direct_IO,
>  	.migratepage		= buffer_migrate_page,
>  	.is_partially_uptodate  = block_is_partially_uptodate,
> -	.error_remove_page	= generic_error_remove_page,
> +	.error_remove_page	= ext3_error_remove_page,
>  };
>  
>  static const struct address_space_operations ext3_journalled_aops = {
> @@ -2008,7 +2035,7 @@ static const struct address_space_operations ext3_journalled_aops = {
>  	.invalidatepage		= ext3_invalidatepage,
>  	.releasepage		= ext3_releasepage,
>  	.is_partially_uptodate  = block_is_partially_uptodate,
> -	.error_remove_page	= generic_error_remove_page,
> +	.error_remove_page	= ext3_error_remove_page,
>  };
>  
>  void ext3_set_aops(struct inode *inode)

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