linux-kernel - Re: [GIT PULL] Btrfs pull request

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Message-ID: <4EBA560B.1070509@jan-o-sch.net>
Date:	Wed, 09 Nov 2011 11:29:31 +0100
From:	Jan Schmidt <list.btrfs@...-o-sch.net>
To:	linux-btrfs <linux-btrfs@...r.kernel.org>
CC:	Christoph Hellwig <hch@...radead.org>,
	Chris Mason <chris.mason@...cle.com>,
	Arne Jansen <sensille@....net>,
	Andrea Gelmini <andrea.gelmini@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Btrfs pull request

Am 09.11.2011 08:48, schrieb Christoph Hellwig:
> On Tue, Nov 08, 2011 at 08:07:01PM -0500, Chris Mason wrote:
>> Looks like bio_add_page() is failing and we're getting the enomem from
>> there.  LVM is only letting us put one page in each bio.
>
> Yes, at the moment all bio based DM targets only allow single page I/O.

Wait. If I got that correctly, each bio_add_page needs special ENOMEM 
treatment (assuming the target could always be a device mapper target), 
right?

"grep bio_add_page fs/btrfs/*.c" will make you unhappy.

-Jan
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