linux-kernel - Re: [PATCH 0/3] vfs: plug some holes involving LAST_BIND symlinks and file bind mounts (try #5)

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Message-ID: <20091130190030.GA5560@shareable.org>
Date:	Mon, 30 Nov 2009 19:00:30 +0000
From:	Jamie Lokier <jamie@...reable.org>
To:	Duane Griffin <duaneg@...da.com>
Cc:	Pavel Machek <pavel@....cz>, Miklos Szeredi <miklos@...redi.hu>,
	Jeff Layton <jlayton@...hat.com>, ebiederm@...ssion.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH 0/3] vfs: plug some holes involving LAST_BIND symlinks and file bind mounts (try #5)

Duane Griffin wrote:
> 2009/11/24 Pavel Machek <pavel@....cz>:
> > On Tue 2009-11-24 12:53:09, Miklos Szeredi wrote:
> >> I still believe leaving the current semantics and documenting them is
> >> the best option.
> >
> > I believe that current semantics is ugly enough that 'documenting' it
> > is not enough... and people want to port from other systems, too, not
> > expecting nasty surprises like this...
> 
> Solaris 10 works the same way as Linux does now, so I don't think the
> porting argument gets you anywhere.

It certainly must be similar, as gnulib uses the same technique on
both Solaris and Linux.

I don't have a Solaris to try this on.  Can you use /proc to re-open
with O_RDWR a file descriptor previously opened with O_RDONLY on
Solaris 10, assuming the underlying inode allows writing?

-- Jamie
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