linux-ext4 - Re: [PATCH 2/5] jbd: ordered data integrity fix

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Message-ID: <20080602115902.GI30613@duck.suse.cz>
Date:	Mon, 2 Jun 2008 13:59:02 +0200
From:	Jan Kara <jack@...e.cz>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	akpm@...ux-foundation.org, sct@...hat.com, adilger@...sterfs.com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jack@...e.cz, jbacik@...hat.com, cmm@...ibm.com, tytso@....edu,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
Subject: Re: [PATCH 2/5] jbd: ordered data integrity fix

On Mon 02-06-08 19:45:04, Hidehiro Kawai wrote:
> Subject: [PATCH 2/5] jbd: ordered data integrity fix
> 
> In ordered mode, if a buffer being dirtied exists in the committing
> transaction, we write the buffer to the disk, move it from the
> committing transaction to the running transaction, then dirty it.
> But we don't have to remove the buffer from the committing
> transaction when the buffer couldn't be written out, otherwise it
> would miss the error and the committing transaction would not abort.
> 
> This patch adds an error check before removing the buffer from the
> committing transaction.
> 
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
  You can add
  Acked-by: Jan Kara <jack@...e.cz>

								Honza
> ---
>  fs/jbd/transaction.c |   16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6.26-rc4/fs/jbd/transaction.c
> ===================================================================
> --- linux-2.6.26-rc4.orig/fs/jbd/transaction.c
> +++ linux-2.6.26-rc4/fs/jbd/transaction.c
> @@ -954,9 +954,10 @@ int journal_dirty_data(handle_t *handle,
>  	journal_t *journal = handle->h_transaction->t_journal;
>  	int need_brelse = 0;
>  	struct journal_head *jh;
> +	int ret = 0;
>  
>  	if (is_handle_aborted(handle))
> -		return 0;
> +		return ret;
>  
>  	jh = journal_add_journal_head(bh);
>  	JBUFFER_TRACE(jh, "entry");
> @@ -1067,7 +1068,16 @@ int journal_dirty_data(handle_t *handle,
>  				   time if it is redirtied */
>  			}
>  
> -			/* journal_clean_data_list() may have got there first */
> +			/*
> +			 * We cannot remove the buffer with io error from the
> +			 * committing transaction, because otherwise it would
> +			 * miss the error and the commit would not abort.
> +			 */
> +			if (unlikely(!buffer_uptodate(bh))) {
> +				ret = -EIO;
> +				goto no_journal;
> +			}
> +
>  			if (jh->b_transaction != NULL) {
>  				JBUFFER_TRACE(jh, "unfile from commit");
>  				__journal_temp_unlink_buffer(jh);
> @@ -1108,7 +1118,7 @@ no_journal:
>  	}
>  	JBUFFER_TRACE(jh, "exit");
>  	journal_put_journal_head(jh);
> -	return 0;
> +	return ret;
>  }
>  
>  /**
> 
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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