linux-ext4 - Re: [PATCH 2/2] ext4: journal superblock modifications in ext4

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Date:	Mon, 23 Nov 2009 09:26:58 -0500
From:	tytso@....edu
To:	Duane Griffin <duaneg@...da.com>
Cc:	Andreas Dilger <andreas.dilger@...tre.org>,
	Eric Sandeen <sandeen@...hat.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/2] ext4: journal superblock modifications in
 ext4_statfs()

On Mon, Nov 23, 2009 at 11:57:44AM +0000, Duane Griffin wrote:
> Unfortunately you can't just blindly give back the journalled block:
> it may have been escaped. So you need to read in the block from the
> journal, unescape it if required, then give it back.

Good point; this is going to make supporting a read-only mount that
doesn't replay the journal very difficult to implement for
data=journal mode, since it would mean intercepting the actual block
I/O read functions for data reads, which is outside of fs/ext4 in the
generic fs/ and mm/ functions.  Doing it for metadata blocks will be
annoying, but at least it's all inside fs/ext4.

					- Ted
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