linux-kernel - Re: [PATCH v3] SUNRPC: set desired file system root before connecting local transports

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Message-ID: <87txu3bdnj.fsf@xmission.com>
Date:	Tue, 09 Oct 2012 13:20:48 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Myklebust\, Trond" <Trond.Myklebust@...app.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	"linux-nfs\@vger.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel\@openvz.org" <devel@...nvz.org>
Subject: Re: [PATCH v3] SUNRPC: set desired file system root before connecting local transports

"Myklebust, Trond" <Trond.Myklebust@...app.com> writes:

> On Tue, 2012-10-09 at 15:35 -0400, J. Bruce Fields wrote:
>> Cc'ing Eric since I seem to recall he suggested doing it this way?

Yes.  On second look setting fs->root won't work. We need to change fs.
The problem is that by default all kernel threads share fs so changing
fs->root will have non-local consequences.

I very much believe we want if at all possible to perform a local
modification.

Changing fs isn't all that different from what devtmpfs is doing.

>> Seems OK to me, but maybe that swap_root should be in common code?  (Or
>> maybe we could use set_fs_root()?)
>> 
>> I'm assuming it's up to Trond to take this.--b.
>
> I'm reluctant to do that at this time since the original proposal was
> precisely that of export set_fs_root() and using it around the AF_LOCAL
> socket bind. That proposal was NACKed by Al Viro.

> If Al is OK with the idea of us creating a private version of
> set_fs_root, then I'd like to see an official Acked-by: that we can
> append to this commit.

Eric

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