linux-ext4 - Re: [PATCH] ext4: Fix data corruption in inodes with journalled data

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Message-ID: <20110727012738.GC19851@thunk.org>
Date:	Tue, 26 Jul 2011 21:27:38 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Fix data corruption in inodes with journalled
 data

On Sat, Jul 23, 2011 at 02:39:37AM +0200, Jan Kara wrote:
> When journalling data for an inode (either because it is a symlink or
> because the filesystem is mounted in data=journal mode), ext4_evict_inode()
> can discard unwritten data by calling truncate_inode_pages(). This is
> because we don't mark the buffer / page dirty when journalling data but only
> add the buffer to the running transaction and thus mm does not know there
> are still unwritten data.
> 
> Fix the problem by carefully tracking transaction containing inode's data,
> committing this transaction, and writing uncheckpointed buffers when inode
> should be reaped.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied to the ext4 tree.

					- Ted
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