linux-kernel - Re: [PATCH 0/4] devpts: fix devpts mount behavior

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Date:	Sun, 23 Sep 2012 10:42:32 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	containers@...ts.linux-foundation.org,
	Dave Hansen <haveblue@...ibm.com>,
	linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>,
	sukadev@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH 0/4] devpts: fix devpts mount behavior

"H. Peter Anvin" <hpa@...or.com> writes:

> On 09/22/2012 08:47 PM, Eric W. Biederman wrote:
>> Making /dev/ptmx a symlink sounds simple, but in practice no one could
>> actually figure out how to make it happen.
>
> This feels particularly ridiculous since udev now requires devtmpfs
> (as in it will no longer work without it), which means this is all
> done in the kernel, so we should just be able to fix this in the
> kernel.

Some versions of udev require devtmpfs.  At best we could have something
conditional in the kernel that does this.

> Greg, Kay, any idea how to make ptmx show up in devtmpfs as a symlink
> to pts/pmtx instead of as a device node?

The conversation stalled in January with that very question.

What I am proposing doesn't conflict with any effort like that.

Eric
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