linux-kernel - Re: [patch 1/4] fs: cleanup files

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Message-ID: <20100604083818.GA9987@infradead.org>
Date:	Fri, 4 Jun 2010 04:38:18 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Al Viro <viro@...IV.linux.org.uk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Frank Mayhar <fmayhar@...gle.com>,
	John Stultz <johnstul@...ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [patch 1/4] fs: cleanup files_lock

On Fri, Jun 04, 2010 at 04:43:08PM +1000, Nick Piggin wrote:
> Lock tty_files with a new spinlock, tty_files_lock; provide helpers to
> manipulate the per-sb files list; unexport the files_lock spinlock.

I'm still not entirely happy with this.  You keep making the tty a
special case by removing it from the files per-sb files list while
nothing else in the system is removed from it.

Thinks would be much better if you could untangle the tty code from
abuse of file->f_u.fu_list entirely.  And from a naive look at the
tty code that actually seems pretty easy.  file->private for ttys
currently directly points to the tty struct.  If you add a tty_private
there which points back to the file, the tty and contains a list_head
the open files in tty code tracking code can be completely divorced
from the per-sb file tracking.  After that we can decide what to do
with the per-sb file tracking, where my favourite still is to get
rid of it entirely.

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