From: Valdis.Kletnieks@vt.edu
To: Vasiliy Kulikov <segoon@openwall.com>
Cc: "Arkadiusz Miśkiewicz" <a.miskiewicz@gmail.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
"Alexey Dobriyan" <adobriyan@gmail.com>
Subject: Re: [PATCH] proc: fix mount -t proc -o AAA
Date: Sun, 25 Mar 2012 18:23:16 -0400 [thread overview]
Message-ID: <97428.1332714196@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Sun, 25 Mar 2012 19:36:12 +0400." <20120325153612.GC4391@albatros>
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On Sun, 25 Mar 2012 19:36:12 +0400, Vasiliy Kulikov said:
> On Sun, Mar 25, 2012 at 09:24 +0200, Arkadiusz Miśkiewicz wrote:
> > but there is another problem - unmounting it and mounting without options
> > causes old option to persist:
> >
> > # mount none /proc -t proc -o hidepid=2
> > # umount /proc
> > # mount none /proc -t proc
> > # grep "/proc" /proc/mounts
> > none /proc proc rw,relatime,hidepid=2 0 0
> >
> > There should be no hidepid=2 now.
>
> No, that's an expected behaviour.
"You keep using that word. I do not think it means what you think it means". ;)
> Procfs is a special filesystem.
And the fact it's "special" makes this *unexpected* behavior. Are there
any other filesystems where -o values will persist across an unmount
and then take effect *even if no -o is given* on a subsequent mount?
Yes, it may be what the code actually *does*, but it certainly violates
the Principle of Least Surprise...
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next prev parent reply other threads:[~2012-03-25 22:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-22 8:03 3.3 and hidepid feature problem - options not always applied at mount Arkadiusz Miśkiewicz
2012-03-23 17:10 ` [PATCH] proc: fix mount -t proc -o AAA Vasiliy Kulikov
2012-03-23 18:45 ` Arkadiusz Miśkiewicz
2012-03-23 19:18 ` Vasiliy Kulikov
2012-03-23 23:15 ` Andrew Morton
2012-03-25 7:24 ` Arkadiusz Miśkiewicz
2012-03-25 15:36 ` Vasiliy Kulikov
2012-03-25 17:40 ` Arkadiusz Miśkiewicz
2012-03-25 17:49 ` Vasiliy Kulikov
2012-03-25 22:23 ` Valdis.Kletnieks [this message]
2012-03-26 22:37 ` Andrew Morton
2012-03-31 13:55 ` [PATCH] proc: reset mount options after the last procfs umount Vasiliy Kulikov
2012-03-31 14:19 ` Arkadiusz Miśkiewicz
2012-03-31 15:20 ` Vasiliy Kulikov
2012-03-31 15:31 ` Arkadiusz Miśkiewicz
2012-03-31 15:46 ` Vasiliy Kulikov
2012-03-26 22:35 ` [PATCH] proc: fix mount -t proc -o AAA Andrew Morton
2012-03-25 15:27 ` Vasiliy Kulikov
2012-03-31 13:51 ` Vasiliy Kulikov
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