linux-kernel - Re: [GFS2] Tidy up bmap & fix boundary bug [48/70]

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Date:	Mon, 04 Dec 2006 10:00:47 +0000
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Russell Cattelan <cattelan@...barn.com>
Cc:	cluster-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [GFS2] Tidy up bmap & fix boundary bug [48/70]

Hi,

On Fri, 2006-12-01 at 13:05 -0600, Russell Cattelan wrote:
> On Thu, 2006-11-30 at 12:20 +0000, Steven Whitehouse wrote:
> > >From 4cf1ed8144e740de27c6146c25d5d7ea26679cc5 Mon Sep 17 00:00:00 2001
> > From: Steven Whitehouse <swhiteho@...hat.com>
> > Date: Wed, 15 Nov 2006 15:21:06 -0500
> > Subject: [PATCH] [GFS2] Tidy up bmap & fix boundary bug
> > 
> > This moves the locking for bmap into the bmap function itself
> > rather than using a wrapper function. It also fixes a bug where
> > the boundary flag was set on the wrong bh.
> does boundary buffers even make sense for gfs?
> 
Yes.

> They might increase cluster contention, and probably serve to
> just chop up io to the fiber-channel raids/disks that have really
> good caches and queuing algorithms.
> 
I've yet to hear of a device that can merge non-contiguous i/o. Read the
comment above fs/mpage.c: mpage_readpages() to see how this scheme
works,

Steve.


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