linux-kernel - Re: [PATCH v2] Fix AFFS race condition.

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Message-ID: <CANGUGtCN3oJDv9Ja5KJ8bBz+HG5_ppeAMrmb34aUpmEH00E8nw@mail.gmail.com>
Date:	Mon, 14 May 2012 13:06:11 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Vladimir 'φ-coder/phcoder' Serbinenko 
	<phcoder@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Josef Bacik <josef@...hat.com>
Subject: Re: [PATCH v2] Fix AFFS race condition.

2012/5/14 Jan Kara <jack@...e.cz>:
> On Mon 14-05-12 12:40:45, Marco Stornelli wrote:
>> 2012/5/14 Jan Kara <jack@...e.cz>:
>> > On Sun 13-05-12 15:44:33, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>> >> AFFS code preallocates several blocks as an optimisation. Unfortunately
>> >> it's not protected by lock so the same blocks may end up allocated twice.
>> >> Here is a fix.
>> >>
>> >> Signed-off-by: Vladimir Serbinenko <phcoder@...il.com>
>> >  The patch looks good to me now. Thanks! You can add:
>> > Reviewed-by: Jan Kara <jack@...e.cz>
>> >
>> >  Al, will you merge this patch through your tree? AFFS does not seem to
>> > have a maintainer so you are a default fallback...
>> >
>> >                                                                Honza
>> >
>>
>> I don't know the AFFS code, so only a question. Instead to use a spin
>> lock, I think we can use a simple mutex. Or is the spin lock
>> mandatory?
>  So what would be an advantage of a mutex? Spinlock *is* the simple locking
> variant...
>
>                                                                Honza
> --

None actually, only style, but if there are performance consideration
already done, ok it was only a question. :)

Marco
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