linux-ext4 - Re: [PATCH] EXT: fix test ext_generic_write

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Date:	Thu, 17 Apr 2008 08:44:36 -0700
From:	Badari Pulavarty <pbadari@...il.com>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	linux-ext4@...r.kernel.org, sct@...hat.com,
	akpm@...ux-foundation.org, adilger@...sterfs.com,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH] EXT: fix test ext_generic_write_end() copied return
	value


On Thu, 2008-04-17 at 05:21 +0200, Roel Kluin wrote:
> 'copied' is unsigned, whereas 'ret2' is not. The test (copied < 0) fails
> 

While your patch is correct, we don't need it :(

"copied" can never be < 0. Infact, the check itself is NOT needed.
It might have been my fault to add that check, when we converted to
write_begin/end interfaces :(

As you can see block_write_end() never returns < 0.

Thanks,
Badari


> Signed-off-by: Roel Kluin <12o3l@...cali.nl>
> ---
> diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
> index eb95670..43daaae 100644
> --- a/fs/ext3/inode.c
> +++ b/fs/ext3/inode.c
> @@ -1261,10 +1261,11 @@ static int ext3_ordered_write_end(struct file *file,
>  		new_i_size = pos + copied;
>  		if (new_i_size > EXT3_I(inode)->i_disksize)
>  			EXT3_I(inode)->i_disksize = new_i_size;
> -		copied = ext3_generic_write_end(file, mapping, pos, len, copied,
> +		ret2 = ext3_generic_write_end(file, mapping, pos, len, copied,
>  							page, fsdata);
> -		if (copied < 0)
> -			ret = copied;
> +		copied = ret2;
> +		if (ret2 < 0)
> +			ret = ret2;
>  	}
>  	ret2 = ext3_journal_stop(handle);
>  	if (!ret)
> @@ -1289,10 +1290,11 @@ static int ext3_writeback_write_end(struct file *file,
>  	if (new_i_size > EXT3_I(inode)->i_disksize)
>  		EXT3_I(inode)->i_disksize = new_i_size;
>  
> -	copied = ext3_generic_write_end(file, mapping, pos, len, copied,
> +	ret2 = ext3_generic_write_end(file, mapping, pos, len, copied,
>  							page, fsdata);
> -	if (copied < 0)
> -		ret = copied;
> +	copied = ret2;
> +	if (ret2 < 0)
> +		ret = ret2;
>  
>  	ret2 = ext3_journal_stop(handle);
>  	if (!ret)
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 945cbf6..47d5d73 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1301,10 +1301,11 @@ static int ext4_ordered_write_end(struct file *file,
>  		new_i_size = pos + copied;
>  		if (new_i_size > EXT4_I(inode)->i_disksize)
>  			EXT4_I(inode)->i_disksize = new_i_size;
> -		copied = ext4_generic_write_end(file, mapping, pos, len, copied,
> +		ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
>  							page, fsdata);
> -		if (copied < 0)
> -			ret = copied;
> +		copied = ret2;
> +		if (ret2 < 0)
> +			ret = ret2;
>  	}
>  	ret2 = ext4_journal_stop(handle);
>  	if (!ret)
> @@ -1329,10 +1330,11 @@ static int ext4_writeback_write_end(struct file *file,
>  	if (new_i_size > EXT4_I(inode)->i_disksize)
>  		EXT4_I(inode)->i_disksize = new_i_size;
>  
> -	copied = ext4_generic_write_end(file, mapping, pos, len, copied,
> +	ret2 = ext4_generic_write_end(file, mapping, pos, len, copied,
>  							page, fsdata);
> -	if (copied < 0)
> -		ret = copied;
> +	copied = ret2;
> +	if (ret2 < 0)
> +		ret = ret2;
>  
>  	ret2 = ext4_journal_stop(handle);
>  	if (!ret)
> --
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