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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20111109121249.GK4149@shiny>
Date:	Wed, 9 Nov 2011 07:12:49 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Jan Schmidt <list.btrfs@...-o-sch.net>
Cc:	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Arne Jansen <sensille@....net>,
	Andrea Gelmini <andrea.gelmini@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Btrfs pull request

On Wed, Nov 09, 2011 at 11:29:31AM +0100, Jan Schmidt wrote:
> 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.

You can always add a single page into a bio.  We do need to deal better
with mixed devices where some have a low limit and some a high limit.

-chris

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/