Date: Sun, 22 Jul 2007 23:22:31 +1000 From: Norberto Meijome <freebsd@meijome.net> To: Stefan Esser <se@FreeBSD.org> Cc: "\[LoN\]Kamikaze" <LoN_Kamikaze@gmx.de>, freebsd-stable@freebsd.org, baldur@foo.is Subject: Re: removing external usb hdd without unmounting causes reboot? Message-ID: <20070722232231.1e2749b1@localhost> In-Reply-To: <46A22417.6030204@FreeBSD.org> References: <200707181142.27240.idiotbg@gmail.com> <200707180839.50113.josh@tcbug.org> <20070718145954.GX36311@gremlin.foo.is> <20070719.084336.-749249732.imp@bsdimp.com> <469F8566.7030905@gmx.de> <20070721110000.5dbf45b2@localhost> <46A22417.6030204@FreeBSD.org>
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On Sat, 21 Jul 2007 17:19:51 +0200
Stefan Esser <se@FreeBSD.org> wrote:
> Norberto Meijome schrieb:
> > On Thu, 19 Jul 2007 17:38:14 +0200
> > "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de> wrote:
> >
> >> As I mentioned earlier I remember it working during the 5.3 era on Stable, at
> >> some point it worked. I even remember removing my CD-Rom drive from my Thinkpad
> >> without running atacontrol detach. The system just took it and the drive just
> >> continued working after I put it back in.
> >
> > on 6.2-STABLE (of a few days ago), i have this happening a couple of times with no adverse effect at all.
> > Burn DVD/Cd, when finished, hald detects the disk, mounts it, /dev/cd0 in /media/whatever.
> >
> > i can eject the disk just fine (which in itself is weird, i think).... the device is still there...
> > umount /dev/cd0
> >
> > works fine and off it goes. other than that, no, i havent tried to access the device in question
>
> In that case the device has been mounted R/O before, and if
> you don't remove it in the middle of a transaction, there
> is nothing the kernel might want to do with the physical
> device to unmount it (and even within a transfer, this ought
> to be caught by the driver). For that reason I had suggested
> to have a soft-R/O mode for removable devices, which together
> with a very short flush delay might allow such a device to
> be mounted R/O "nearly all the time" (tm) ;-) This is not
> a perfect solution, but it is similar to the way USB sticks
> are used with Windows/XP: Wait a second or two and remove it.
> While not perfect this covers the case of MP3 players or
> digicams that are mounted as USB storage devices, and many
> other cases. To make this a perfect solution is much harder,
> but even a simple implementation would be a big step forward.
Yes, I agree it would be a good interim solution.
thx!
_________________________
{Beto|Norberto|Numard} Meijome
"It is a lesson which all history teaches wise men, to put trust in ideas, and not in circumstances."
Emerson
I speak for myself, not my employer. Contents may be hot. Slippery when wet. Reading disclaimers makes you go blind. Writing them is worse. You have been Warned.
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