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

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Message-ID: <20081106163228.GF25194@skywalker>
Date:	Thu, 6 Nov 2008 22:02:28 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Peter Staubach <staubach@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH]: ext4: fix big endian

On Thu, Nov 06, 2008 at 05:15:53PM +0100, Christian Borntraeger wrote:
> Am Donnerstag, 6. November 2008 schrieb Peter Staubach:
> > >  	/* 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...
> 
> errm. Right.
> Something like this maybe?
> 
> [PATCH]: ext4: fix big endian access for flex groups
> 
> 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>

There is already a patch in the patchqueue that fix this
http://repo.or.cz/w/ext4-patch-queue.git?a=blob;f=convert-to-host-order-in-ext4_fill_flex_info;h=ebe7efb3ee78b6cab4db49391f4a005d78a26f03;hb=HEAD


-aneesh
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