linux-kernel - Re: [PATCH] driver-core: devtmpfs - driver core maintained /dev tmpfs

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Message-ID: <49FD47D0.2070802@msgid.tls.msk.ru>
Date:	Sun, 03 May 2009 11:29:20 +0400
From:	Michael Tokarev <mjt@....msk.ru>
To:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
CC:	Kay Sievers <kay.sievers@...y.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Jan Blunck <jblunck@...e.de>,
	linux-arch@...r.kernel.org, viro@...iv.linux.org.uk,
	torvalds@...l.org, akpm@...l.org, adam@...drasil.com
Subject: Re: [PATCH] driver-core: devtmpfs - driver core maintained /dev tmpfs

Alan Jenkins wrote:
> On 5/2/09, Kay Sievers <kay.sievers@...y.org> wrote:
[]
>>> And it
>>> gives a nice clean way for new initramfs' to test for this feature -
>>> when they try to mount it, it fails.  It would seem to make for a
>>> rather smoother migration path.
>> I think that is all covered just fine.
> 
> Oh, I see.
> 
> grep "/dev" /proc/mounts > /dev/null

Oh no.  This one will match all your /dev/sda1 etc too :)
What yo want to do is either

   grep -w /dev /proc/mount

or

  awk '$2 == "/dev" { exit 0; } END { exit 1; }' /proc/mounts

or something similar.  To distinguish between the following
two cases:

/dev/sda1 / ext3 rw,noatime,data=ordered 0 0
devfs /dev tmpfs rw,nosuid,size=512k,mode=755 0 0

/mjt
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