linux-ext4 - Re: disallow FS recursion from sb_issue

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Date:	Wed, 28 Jul 2010 20:12:15 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	Ted Ts'o <tytso@....edu>, Mikulas Patocka <mpatocka@...hat.com>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	Alasdair G Kergon <agk@...hat.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: disallow FS recursion from sb_issue_discard allocation

On 07/27/2010 05:33 PM, Mike Snitzer wrote:
> On Tue, Jul 27 2010 at  9:44am -0400,
> Ted Ts'o <tytso@....edu> wrote:
> 
>> On Tue, Jul 06, 2010 at 12:11:56PM -0400, Mike Snitzer wrote:
>>> Filesystems can call sb_issue_discard on a memory reclaim path
>>> (e.g. ext4 calls sb_issue_discard during journal commit).
>>>
>>> Use GFP_NOFS in sb_issue_discard to avoid recursing back into the FS.
>>>
>>> Reported-by: Mikulas Patocka <mpatocka@...hat.com>
>>> Signed-off-by: Mike Snitzer <snitzer@...hat.com>
>>
>> Hi Jens,
>>
>> I never saw an ack from you on this patch.  Are you ok with it, and
>> have you grabbed it for your tree?  Do you want me to include this in
>> the ext4 tree, even though it's a patch to include/linux/blkdev.h?
> 
> Hi Ted,
> 
> Thanks for following up on this.  In my experience, Jens is more apt to
> pick up a patch if it gets explicitly 'Acked-by' other stake-holders
> (especially when a patch is motivated by another subsystem, in this case
> the proposed block change addresses a problem unique to fs/ext4).

I'll pick this up. I've been away for a few weeks and I'm currently
on vacation, but I'll push this with a few other pending patches
for .35 on monday.

-- 
Jens Axboe


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