linux-kernel - Re: [PATCH -mm] jbd: test BH_Write_EIO to detect errors on metadata buffers

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Date:	Thu, 11 Sep 2008 13:56:15 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
CC:	akpm@...ux-foundation.org, sct@...hat.com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jack@...e.cz, jbacik@...hat.com, cmm@...ibm.com, tytso@....edu,
	adilger@....com, yumiko.sugita.yf@...achi.com,
	satoshi.oshima.fk@...achi.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH -mm] jbd: test BH_Write_EIO to detect errors on metadata
    buffers

Hidehiro Kawai wrote:
> __try_to_free_cp_buf(), __process_buffer(), and __wait_cp_io()
> test BH_Uptodate flag to detect write I/O errors on metadata
> buffers.  But by commit 95450f5a7e53d5752ce1a0d0b8282e10fe745ae0
> "ext3: don't read inode block if the buffer has a write error"(*),
> BH_Uptodate flag can be set to inode buffers with BH_Write_EIO
> in order to avoid reading old inode data.  So now, we have to
> test BH_Write_EIO flag of checkpointing inode buffers instead
> of BH_Uptodate.  This patch does it.
> 
> (*) http://lkml.org/lkml/2008/6/23/126
> 
> This patch depends on the following patch set in -mm:
> 
> #1 jbd: abort when failed to log metadata buffers
>    http://lkml.org/lkml/2008/7/24/160
> #2 jbd: fix error handling for checkpoint io
>    http://lkml.org/lkml/2008/7/24/163
> #3 ext3: add checks for errors from jbd
>    http://lkml.org/lkml/2008/7/29/539
> #4 jbd: don't dirty original metadata buffer on abort
>    http://lkml.org/lkml/2008/7/24/168
> 
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
> ---
Thanks, you can add

Acked-by: Eric Sandeen <sandeen@...hat.com>

too.

>  fs/jbd/checkpoint.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> Index: linux-2.6.27-rc5-mm1/fs/jbd/checkpoint.c
> ===================================================================
> --- linux-2.6.27-rc5-mm1.orig/fs/jbd/checkpoint.c
> +++ linux-2.6.27-rc5-mm1/fs/jbd/checkpoint.c
> @@ -94,7 +94,7 @@ static int __try_to_free_cp_buf(struct j
>  	struct buffer_head *bh = jh2bh(jh);
>  
>  	if (jh->b_jlist == BJ_None && !buffer_locked(bh) &&
> -	    !buffer_dirty(bh) && buffer_uptodate(bh)) {
> +	    !buffer_dirty(bh) && !buffer_write_io_error(bh)) {
>  		JBUFFER_TRACE(jh, "remove from checkpoint list");
>  		ret = __journal_remove_checkpoint(jh) + 1;
>  		jbd_unlock_bh_state(bh);
> @@ -214,7 +214,7 @@ restart:
>  			spin_lock(&journal->j_list_lock);
>  			goto restart;
>  		}
> -		if (unlikely(!buffer_uptodate(bh)))
> +		if (unlikely(buffer_write_io_error(bh)))
>  			ret = -EIO;
>  
>  		/*
> @@ -283,7 +283,7 @@ static int __process_buffer(journal_t *j
>  		ret = 1;
>  	} else if (!buffer_dirty(bh)) {
>  		ret = 1;
> -		if (unlikely(!buffer_uptodate(bh)))
> +		if (unlikely(buffer_write_io_error(bh)))
>  			ret = -EIO;
>  		J_ASSERT_JH(jh, !buffer_jbddirty(bh));
>  		BUFFER_TRACE(bh, "remove from checkpoint");
> 
> 
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