linux-ext4 - Re: [PATCH 1/5] ext4: Use filemap_write_and_wait

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Message-ID: <alpine.LFD.2.00.1404162217350.2368@localhost.localdomain>
Date:	Wed, 16 Apr 2014 22:20:05 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	linux-ext4@...r.kernel.org
cc:	linkinjeon@...il.com
Subject: Re: [PATCH 1/5] ext4: Use filemap_write_and_wait_range() correctly
 in collapse range

So unfortunately this does not fix all the problems. Even though
this fixes all the problems with collapse rage when page size ==
block size it still fails some tests when page size > block size so
I guess we still have some work to do.

Thanks!
-Lukas

On Wed, 16 Apr 2014, Lukas Czerner wrote:

> Date: Wed, 16 Apr 2014 20:32:58 +0200
> From: Lukas Czerner <lczerner@...hat.com>
> To: linux-ext4@...r.kernel.org
> Cc: linkinjeon@...il.com, Lukas Czerner <lczerner@...hat.com>
> Subject: [PATCH 1/5] ext4: Use filemap_write_and_wait_range() correctly in
>     collapse range
> 
> Currently we're passing -1 as lend argumnet for
> filemap_write_and_wait_range() which is wrong since lend is signed type
> so it would cause some confusion and we might not write_and_wait for the
> entire range we're expecting to write.
> 
> Fix it by using LLONG_MAX instead.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  fs/ext4/extents.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index ff823b7..821c1d4 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -5378,7 +5378,7 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
>  	punch_stop = (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb);
>  
>  	/* Write out all dirty pages */
> -	ret = filemap_write_and_wait_range(inode->i_mapping, offset, -1);
> +	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
>  	if (ret)
>  		return ret;
>  
> 
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