Date: Thu, 6 Jan 2005 12:13:11 -0800
From: "Paul E. McKenney" <paulmck@us.ibm.com>
To: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, jtk@us.ibm.com,
       wtaber@us.ibm.com, pbadari@us.ibm.com, markv@us.ibm.com,
       greghk@us.ibm.com
Subject: Re: [PATCH] fs: Restore files_lock and set_fs_root exports
Message-ID: <20050106201311.GI1292@us.ibm.com>
Reply-To: paulmck@us.ibm.com
References: <20050106190538.GB1618@us.ibm.com> <20050106191441.GM26051@parcelfarce.linux.theplanet.co.uk>
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On Thu, Jan 06, 2005 at 07:14:41PM +0000, Al Viro wrote:
> On Thu, Jan 06, 2005 at 11:05:38AM -0800, Paul E. McKenney wrote:
> > Hello, Andrew,
> > 
> > Some export-removal work causes breakage for an out-of-tree filesystem.
> > Could you please apply the attached patch to restore the exports for
> > files_lock and set_fs_root?
> 
> What, in name of everything unholy, is *filesystem* doing with set_fs_root()?

It is using it to set the process's view of the source-code control
system to the desired version.  So process A can see version 2.1 while
process B sees version 1.5, and so that either process can change the
version that it sees on the fly.

						Thanx, Paul
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