linux-ext4 - Re: [PATCH 3/5] ext4: add warning to ext4_convert_unwritten_extents

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Date:	Mon, 4 Mar 2013 22:00:00 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz,
	wenqing.lz@...bao.com
Subject: Re: [PATCH 3/5] ext4: add warning to
 ext4_convert_unwritten_extents_endio

On Mon, Feb 25, 2013 at 08:07:41PM +0400, Dmitry Monakhov wrote:
> Splitting extents inside endio is bad thing, but unfortunetly it is still
> possible. In fact we are pretty close to the moment when all related
> issues will be fixed. Let's warn developer if it still the case.
> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> ---
>  fs/ext4/extents.c |   13 ++++++++++++-
>  1 files changed, 12 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 1d37f2d..78c2a91 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3386,8 +3386,19 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
>  		"block %llu, max_blocks %u\n", inode->i_ino,
>  		  (unsigned long long)ee_block, ee_len);
>  
> -	/* If extent is larger than requested then split is required */
> +	/* If extent is larger than requested it is a clear sign that we still
> +	 * have some extent state machine issues left. So extent_split is still
> +	 * required.
> +	 * TODO: Once all related issues will be fixed this situation should be
> +	 * illegal.
> +	 */
>  	if (ee_block != map->m_lblk || ee_len > map->m_len) {
> +#ifdef EXT4_DEBUG
> +		ext4_warning("Inode (%ld) finished: extent logical block %llu,"
A parameter is missing.

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 25c86aa..daf8bb9 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3395,7 +3395,8 @@ static int
ext4_convert_unwritten_extents_endio(handle_t *handle,
         */
        if (ee_block != map->m_lblk || ee_len > map->m_len) {
 #ifdef EXT4_DEBUG
-               ext4_warning("Inode (%ld) finished: extent logical block %llu,"
+               ext4_warning(inode->i_sb,
+                            "Inode (%ld) finished: extent logical block %llu,"
                             " len %u; IO logical block %llu, len %u\n",
                             inode->i_ino, (unsigned long long)ee_block, ee_len,
                             (unsigned long long)map->m_lblk, map->m_len);

Regards,
                                                - Zheng

> +			     " len %u; IO logical block %llu, len %u\n",
> +			     inode->i_ino, (unsigned long long)ee_block, ee_len,
> +			     (unsigned long long)map->m_lblk, map->m_len);
> +#endif
>  		err = ext4_split_unwritten_extents(handle, inode, map, path,
>  						   EXT4_GET_BLOCKS_CONVERT);
>  		if (err < 0)
> -- 
> 1.7.1
> 
> --
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