From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: [PATCH] replace SYSV shared memory with shm filesystem
Date: Mon, 10 Jan 2000 12:39:50 +0000 (GMT)
In-Reply-To: <qwwvh52ruin.fsf_-_@sap.com> from "Christoph Rohland" at Jan 10, 2000 01:17:04 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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To: Christoph Rohland <hans-christoph.rohland@sap.com>
Cc: MM mailing list <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.rutgers.edu>, "Eric W. Biederman" <ebiederm+eric@ccr.net>, Alexander Viro <viro@math.psu.edu>, Alan Cox <alan@lxorguk.ukuu.org.uk>, GOTO Masanori <gotom@debian.or.jp>
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> replaces/reuses the existing SYSV shm code so you now have to mount
> the fs to be able to use SYSV SHM. But in turn we now have everything
> in place to implement posix shm. This also obsoletes vm_private_data
> in vm_area_struct.

Umm no. It obsoletes vm_private_data for existing merged file systems. The stackable
file systems still need this field (cryptfs, lofs etc)

> Also it is now possible to do e.g. 'rm /dev/shm/*' instead of this
> terrible 'ipcrm shm xx' :-)

Nice

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