linux-ext4 - Re: [PATCH] libext2fs: Always swab MMP block on BE machines

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Message-ID: <20110930230322.GO12440@thunk.org>
Date:	Fri, 30 Sep 2011 19:03:22 -0400
From:	Ted Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] libext2fs: Always swab MMP block on BE machines

On Fri, Sep 30, 2011 at 12:41:26PM -0700, Darrick J. Wong wrote:
> The MMP code in libext2fs tries to gate MMP block swab'ing with this test:
> 
> #ifdef EXT2FS_ENABLE_SWAPFS
> if (fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
> 
> However, EXT2FS_ENABLE_SWAPFS never seems to be defined anywhere (all possible
> #define's were cleaned out of e2fsprogs ages ago), and even if any still
> existed, the field fs->super->s_magic is always in host byteorder, so the test
> always fails.  So, we can change the #ifdef to WORDS_BIGENDIAN (which is
> conditionally defined on BE platforms) and get rid of the broken if test.
> 
> (This fix came up while testing the metadata checksumming patchset)
> 
> Signed-off-by: Darrick J. Wong <djwong@...ibm.com>

Applied, thanks.

						- Ted
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