linux-kernel - Re: Driver-Core: devtmpfs - reset inode permissions before unlinking

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Message-ID: <ac3eb2511001141259t751c6063p8919692a8164e2b@mail.gmail.com>
Date:	Thu, 14 Jan 2010 21:59:48 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Driver-Core: devtmpfs - reset inode permissions before unlinking

On Thu, Jan 14, 2010 at 21:53, Henrique de Moraes Holschuh
<hmh@....eng.br> wrote:
> On Wed, 13 Jan 2010, Kay Sievers wrote:
>> across the device lifetime by creating hardlinks, in the unusual case
>> that there is a user-writable directory on the same filesystem.
>
> Does a tmpfs mounted in /dev/shm count as "user-writable directory on the
> same filesystem" ?

Not if it's a separate tmpfs mount, which is recommended. Only if it's
just a plain directory on the /dev filesystem.

Udev does the same and resets the permissions of the inode before deleting it.

Kay
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