linux-kernel - Re: [PATCH 0/3] Fixes for vfs-scale and vfs-automount

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Message-ID: <20110224035836.GS22723@ZenIV.linux.org.uk>
Date:	Thu, 24 Feb 2011 03:58:37 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ian Kent <raven@...maw.net>
Cc:	Nick Piggin <npiggin@...nel.dk>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	David Howells <dhowells@...hat.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: [PATCH 0/3] Fixes for vfs-scale and vfs-automount

On Thu, Feb 24, 2011 at 11:28:57AM +0800, Ian Kent wrote:

> Ha, I haven't even turned on my Ultrsparc 2 in months, it's only got an
> old version of Solaris on it now anyway, ;)

U60, with lenny (and mainline kernel) on it.  Probably ought to upgrade
to squeeze one of those days...  It works, all right, but it's only 2-way,
so reproducing would probably be harder.  Plus the fun of building the tests
themselves on somewhat different userland...

Anyway, I wonder why you care about __d_lookup_rcu() and ->d_inode stability;
d_mountpoint() _is_ stable at that point (we hold vfsmount_lock) and you
don't seem to look at ->d_inode at all in RCU case.  Note that ->d_automount()
is never called in RCU case at all; nor is ->lookup() and friends, so you
really only have ->d_manage() to cope with, what with autofs4 having no
->d_revalidate() anymore.

BTW, Nick has moved to kernel.dk; whether he's still reachable there is
a question, though - he seems to have disappeared since mid-January.
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