linux-ext4 - Question about writable ext4-snapshot

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Message-ID: <CAFZ0FUWzq4GV-Xi6n+8+5R+oVi8uPBFg6XHzgwZfXVP_FbMz=w@mail.gmail.com>
Date:	Sat, 21 Jan 2012 10:45:27 +0800
From:	Robin Dong <hao.bigrat@...il.com>
To:	amir73il@...il.com
Cc:	Tao Ma <taoma.tm@...il.com>, coly <colyli@...il.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Question about writable ext4-snapshot

Hello, Amir

I am evaluating ext4-snapshot (on github) for TAOBAO recently. The
snapshot of an ext4 fs is READONLY now, but we do need to write data
into snapshot. We also want using  ext4-snapshot to do online-fsck on
Hadoop clusters, but our hadoop clusters are using no-journal ext4
now. So we have some question

1. Will it be possible to implement a writable ext4-snapshot ?
2. Will it be possible to snapshot a no-journal ext4-fs ?
3. What's the difficult point of  implementing above ?

Any of your reply will be appreciate

-- 
--
Best Regard
Robin Dong
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