linux-ext4 - Re: Is ext2 freezable?

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Message-ID: <20140918191736.GC19520@thunk.org>
Date:	Thu, 18 Sep 2014 15:17:36 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Is ext2 freezable?

On Thu, Sep 18, 2014 at 06:46:21AM +0000, Dexuan Cui wrote:
> 
> I've got the answer:
> ext2.ko itself does support fsfreeze, but typical linux distros don't supply
> ext2.ko at all now -- instead, they usually supply ext3.ko and have ext4 builtin.
> 
> So when I mount an ext2 partition, actually the kernel is registering the ext4
> driver as an ext2 driver and in this case the ext2's s_op->freeze_fs is NULL --
> but, why did ext4 choose this behavior for ext2?

It wasn't a deliberate design choice.  It was just that when
no-journal mode was added to ext4, freeeze support was never
implemented, and up until now, no one had asked for it.  We can add it
to ext4; thanks for calling it to our attention.

Cheers,

					- Ted
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