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

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Message-ID: <20121106120642.GA6718@fieldses.org>
Date:	Tue, 6 Nov 2012 07:06:42 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...nvz.org" <devel@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v3] SUNRPC: set desired file system root before
 connecting local transports

On Tue, Nov 06, 2012 at 02:14:50PM +0400, Stanislav Kinsbursky wrote:
> 09.10.2012 23:35, J. Bruce Fields пишет:
> >Cc'ing Eric since I seem to recall he suggested doing it this way?
> >
> >Seems OK to me, but maybe that swap_root should be in common code?  (Or
> >maybe we could use set_fs_root()?)
> >
> 
> This patch is not good since, as Eric mentioned, all kernel threads
> share same fs struct.
> We can swap whole fs struct. Or we can unshare fs struct
> (unshare_fs_struct() is exported) and swap root in this case.
> But this approach is to close to set_fs_root() logic, which is not
> exported and seems there are some valid reasons for it.

What are those reasons?

Googling found one previous thread:

	http://thread.gmane.org/gmane.linux.kernel/1259986/focus=47687

There Trond requests an ACK from Al or Cristoph for the export, but I
don't see either an ACK or any objection.

--b.
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