linux-ext4 - Re: [patch] fs: fix deadlocks in writeback_if

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Message-Id: <20101124144740.bffb2716.akpm@linux-foundation.org>
Date:	Wed, 24 Nov 2010 14:47:40 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Nick Piggin <npiggin@...nel.dk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Jan Kara <jack@...e.cz>, Eric Sandeen <sandeen@...hat.com>,
	"Theodore Ts'o" <tytso@....edu>
Subject: Re: [patch] fs: fix deadlocks in writeback_if_idle

On Tue, 23 Nov 2010 07:34:07 -0500
Chris Mason <chris.mason@...cle.com> wrote:

> For btrfs there's only one bdi per SB, but for most everyone else a disk
> with a bunch of partitions is going to have multiple filesystems on the
> same bdi.

um, please explain why that wasn't idiotic?  The BDI is a
representation of a backing device and it's *supposed* to provide
visibility into what's happening against other partitions on the same
device.  Creating a BDI per SB (it didn't even occur to me to think
that a filesystem was even able to do this) breaks that.


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