From: Coywolf Qi Hunt <coywolf@gmail.com>
To: sander@humilis.net
Cc: Willy Tarreau <willy@w.ods.org>,
john stultz <johnstul@us.ibm.com>,
lkml <linux-kernel@vger.kernel.org>,
greg@kroah.com, axboe@suse.de, vandrove@vc.cvut.cz,
aia21@cam.ac.uk, akpm@osdl.org
Subject: Re: [RFC] Let non-root users eject their ipods?
Date: Tue, 20 Dec 2005 17:31:12 +0800 [thread overview]
Message-ID: <2cd57c900512200131l4ff29837o@mail.gmail.com> (raw)
In-Reply-To: <20051220085653.GA3137@favonius>
2005/12/20, Sander <sander@humilis.net>:
> Coywolf Qi Hunt wrote (ao):
> > 2005/12/20, Willy Tarreau <willy@w.ods.org>:
> > > On Mon, Dec 19, 2005 at 06:51:58PM -0800, john stultz wrote:
> > > > I'm getting a little tired of my roommates not knowing how to safely
> > > > eject their usb-flash disks from my system and I'd personally like it if
> > > > I could avoid bringing up a root shell to eject my ipod. Sure, one could
> > > > suid the eject command, but that seems just as bad as changing the
> > > > permissions in the kernel (eject wouldn't be able to check if the user
> > > > has read/write permissions on the device, allowing them to eject
> > > > anything).
> > >
> > > You may find my question stupid, but what is wrong with umount ? That's
> > > how I proceed with usb-flash and I've never sent any eject command to
> > > it (I even didn't know that the ioctl would be accepted by an sd device).
> >
> > IMHO, umount doesn't guarantee sync, isn't it?
Actually I was think umount(2), since this is the kernel list, but off
topic here.
>
> I'm pretty sure it does :-)
That is because: usually your removable media is not the file system
root, hence umount(8) can return successfully only if no processes are
busy working on it.
If you boot from or chroot/pivot into a removable media, and you
remount it ro, and unplug it, then you may lose data.
-- coywolf
>
> Anyway, that is how I treat all usb/firewire disks, and I've never lost
> data. Just umount and unplug when the prompt returns.
>
> --
> Humilis IT Services and Solutions
> http://www.humilis.net
>
next prev parent reply other threads:[~2005-12-20 9:31 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-20 2:51 [RFC] Let non-root users eject their ipods? john stultz
2005-12-20 3:51 ` Wakko Warner
2005-12-20 3:49 ` john stultz
2005-12-20 5:05 ` Matthew Dharm
2005-12-24 21:16 ` Jan Engelhardt
2005-12-20 5:18 ` Willy Tarreau
2005-12-20 6:06 ` Coywolf Qi Hunt
2005-12-20 8:56 ` Sander
2005-12-20 9:31 ` Coywolf Qi Hunt [this message]
2005-12-20 9:38 ` Sander
2005-12-20 16:39 ` Bill Davidsen
2005-12-20 11:10 ` Nikita Danilov
2005-12-20 7:46 ` Jens Axboe
2005-12-20 12:41 ` Ben Collins
2005-12-20 13:28 ` Jens Axboe
2005-12-20 13:32 ` Ben Collins
2005-12-20 13:39 ` Jens Axboe
2005-12-20 14:07 ` [PATCH] block: Better CDROMEJECT Ben Collins
2005-12-20 14:16 ` Jens Axboe
2005-12-20 20:41 ` john stultz
2005-12-20 20:54 ` Jens Axboe
2005-12-20 20:55 ` john stultz
2005-12-20 20:58 ` Jens Axboe
2005-12-20 20:58 ` john stultz
2005-12-20 20:55 ` Ben Collins
2005-12-20 16:48 ` [RFC] Let non-root users eject their ipods? Bill Davidsen
2005-12-22 10:56 ` Alan Cox
2005-12-22 16:57 ` john stultz
2005-12-24 21:17 ` Jan Engelhardt
[not found] <5lFTx-7L1-9@gated-at.bofh.it>
[not found] ` <5lIeC-3hP-3@gated-at.bofh.it>
[not found] ` <5lIRn-4GE-19@gated-at.bofh.it>
[not found] ` <5lLw7-1f5-43@gated-at.bofh.it>
[not found] ` <5lM8s-2D4-1@gated-at.bofh.it>
[not found] ` <5lM8F-2D4-39@gated-at.bofh.it>
[not found] ` <5lSQE-87T-9@gated-at.bofh.it>
2005-12-20 20:21 ` Bodo Eggert
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