linux-ext4 - Re: [PATCH] Convert EXT2 to use unlocked

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Message-ID: <87myr4ek82.fsf@barad-dur.regala.cx>
Date:	Thu, 17 Jan 2008 12:59:25 +0100
From:	Mathieu SEGAUD <mathieu.segaud@...ala.cx>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, sct@...hat.com
Subject: Re: [PATCH] Convert EXT2 to use unlocked_ioctl

Vous m'avez dit récemment :

> On Thursday 17 January 2008, you wrote:
>> 
>> Change ext_ioctl() to be an unlocked_ioctl(), explicitly
>> exposing BKL's uses.
>> 
>> Signed-off-by: Mathieu Segaud <mathieu.segaud@...ala.cx>
>
> You are now calling lock_kernel() twice in case of ext2_compat_ioctl(),
> which calls back into ext2_ioctl with the BKL already held.
>
> This is allowed with the BKL, but really bad style that you should
> avoid. I assume the ext3 and ext4dev versions of your patch have
> the same issue, but I didn't check in detail.

yep, they do. I noticed this nested calls. I guess I will add
_extX_compat_ioctl() running with no BKL's which would be used by both
extX_ioctl() and extX_compat_ioctl().
Any comments on such a strategy ? thanks a lot for the reminder :)

-- 
Mathieu

ps: I just posted a set of patches for reiserfs that may suffer the
same ugly style
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