linux-ext4 - Re: [PATCH] ext4_freeze: don't return to userspace with a mutex held

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Message-ID: <4BB9323D.7050206@redhat.com>
Date:	Sun, 04 Apr 2010 19:43:41 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Theodore Tso <tytso@....EDU>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4_freeze: don't return to userspace with a mutex held

Theodore Tso wrote:
> On Apr 4, 2010, at 5:23 PM, Eric Sandeen wrote:
>> Well, there is __generic_file_aio_write doing vfs_check_frozen, but
>>  I thought there was more at the vfs level to stop things from
>> getting to the filesystem... *shrug* I see you put the patch in as
>> sent, it sounds right to me.
> 
> Yeah, it looks safe but it would be nice to do some testing to make
> sure there's nothing we missed.
> 
> I'm also vaguely worried whether the right thing will happen in
> no-journal mode, but it looks like it's better than what we had
> before (which clearly would have never worked in no journal mode), so
> I decided to let it pass.

I did go back up the callchain from where the old lock should have
caught it, so I think I've plugged the same holes that were protected
before.

> Testing the freeze functionality definitely needs to be done before
> we trust what happens in no journal mode, for sure.

Oh good point, hadn't even thought about nojournal mode & freeze.
Always nice to "accidentally" fix things ;)

-Eric

> 
> -- Ted
> 
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