linux-ext4 - Re: [PATCH] jbd2: fix regression where we fail to initialize checksum seed when loading

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Date:	Mon, 1 Dec 2014 22:05:55 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org, Eric Whitney <enwlinux@...il.com>
Subject: Re: [PATCH] jbd2: fix regression where we fail to initialize
 checksum seed when loading

On Mon, Dec 01, 2014 at 04:22:23PM -0800, Darrick J. Wong wrote:
> When we're enabling journal features, we cannot use the predicate
> jbd2_journal_has_csum_v2or3() because we haven't yet set the sb
> feature flag fields!  Moreover, we just finished loading the shash
> driver, so the test is unnecessary; calculate the seed always.
> 
> Without this patch, we fail to initialize the checksum seed the first
> time we turn on journal_checksum, which means that all journal blocks
> written during that first mount are corrupt.  Transactions written
> after the second mount will be fine, since the feature flag will be
> set in the journal superblock.  xfstests generic/{034,321,322} are the
> regression tests.
> 
> (This is important for 3.18.)
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.coM>
> Reported-by: Eric Whitney <enwlinux@...il.com>

Applied, thanks.  I've confirmed this has fixed the xfstests
regressions, and I'll be sending this to Linus shortly.

	     	      	 	      - Ted
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