linux-kernel - Re: [PATCH 6/6] fs: Introduce kern_mount

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Message-ID: <20081127095321.GE13860@infradead.org>
Date:	Thu, 27 Nov 2008 04:53:21 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 6/6] fs: Introduce kern_mount_special() to mount
	special vfs

On Thu, Nov 27, 2008 at 12:32:59AM +0100, Eric Dumazet wrote:
> This function arms a flag (MNT_SPECIAL) on the vfs, to avoid
> refcounting on permanent system vfs.
> Use this function for sockets, pipes, anonymous fds.

special is not a useful name for a flag, by definition everything that
needs a flag is special compared to the version that doesn't need a
flag.

The general idea of skippign the writer counts makes sense, but please
give it a descriptive name that explains the not unmountable thing.
And please kill your kern_mount wrapper and just set the flag manually.

Also I think it should be a superblock flag, not a mount flag as you
don't want thse to differ for multiple mounts of the same filesystem.

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