linux-kernel - Re: [PATCH]: ext4: fix big endian

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Message-ID: <49131601.50407@redhat.com>
Date:	Thu, 06 Nov 2008 11:06:25 -0500
From:	Peter Staubach <staubach@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
CC:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH]: ext4: fix big endian 

Christian Borntraeger wrote:
> Ok, I think I found it:
>
> On big endianess plattforms newly created ext4 file systems cannot be mounted
> and show messages like:
> [6923911.715968] EXT4-fs: not enough memory for 522250 flex groups
> [6923911.715973] EXT4-fs: unable to initialize flex_bg meta info!
>
> We have to access s_reserved_gdb_blocks with le16_to_cpu.
>
> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>  fs/ext4/super.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: kvm/fs/ext4/super.c
> ===================================================================
> --- kvm.orig/fs/ext4/super.c
> +++ kvm/fs/ext4/super.c
> @@ -1455,7 +1455,7 @@ static int ext4_fill_flex_info(struct su
>  
>  	/* We allocate both existing and potentially added groups */
>  	flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
> -			    ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
> +			    (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks + 1) <<
>   

I suspect that you want to do the le16_to_cpu() and _then_
add the 1.  Otherwise, adding 1 to a different byte order
value won't do quite what is expected or hoped for...

       ps

>  			      EXT4_DESC_PER_BLOCK_BITS(sb))) /
>  			   groups_per_flex;
>  	sbi->s_flex_groups = kzalloc(flex_group_count *
> --
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