linux-ext4 - Re: [PATCH 1/5][64-BIT] ext2fs_block_alloc_stats2: fix size comparison for 64-bit compatibility.

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Date:	Wed, 15 Apr 2009 15:53:56 -0400
From:	Valerie Aurora Henson <vaurora@...hat.com>
To:	Nick Dokos <nicholas.dokos@...com>
Cc:	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/5][64-BIT] ext2fs_block_alloc_stats2: fix size comparison for 64-bit compatibility.

On Wed, Apr 08, 2009 at 05:46:05PM -0400, Nick Dokos wrote:
> The block number comparison in ext2fs_block_alloc_stats2() is invalid
> for 64-bit filesystems: it compares the block number to the low
> 32-bits of the blocks_count in the superblock. That caused the journal
> file for a 32TiB filesystem to be malformed and the resulting filesystem
> could not be mounted.
> 
> The function now uses ext2fs_blocks_count() [from blknum.c] to calculate
> the number of blocks.
> 
> With this change, the journal looks sane and the filesystem could be
> mounted.
> 
> Signed-off-by: Nick Dokos <nicholas.dokos@...com>

Signed-off-by: Valerie Aurora (Henson) <vaurora@...hat.com>

> ---
>  lib/ext2fs/alloc_stats.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/lib/ext2fs/alloc_stats.c b/lib/ext2fs/alloc_stats.c
> index 7895aee..f0c5a64 100644
> --- a/lib/ext2fs/alloc_stats.c
> +++ b/lib/ext2fs/alloc_stats.c
> @@ -65,7 +65,7 @@ void ext2fs_block_alloc_stats2(ext2_filsys fs, blk64_t blk, int inuse)
>  	int	group = ext2fs_group_of_blk2(fs, blk);
>  
>  #ifndef OMIT_COM_ERR
> -	if (blk >= fs->super->s_blocks_count) {
> +	if (blk >= ext2fs_blocks_count(fs->super)) {
>  		com_err("ext2fs_block_alloc_stats2", 0,
>  			"Illegal block number: %lu", blk);
>  		return;
> -- 
> 1.6.0.6
> 
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