Re: [PATCH] Convert EXT2 to use unlocked_ioctl

From: Mathieu SEGAUD
Date: Thu Jan 17 2008 - 06:59:36 EST


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@xxxxxxxxx>
>
> 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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