usb/46176: Let's save the horse! [was: HEADSUP new usb code
oberman at es.net
Thu Aug 21 16:38:02 UTC 2008
> From: "Alexey Shuvaev" <shuvaev at physik.uni-wuerzburg.de>
> Date: Thu, 21 Aug 2008 12:02:15 +0200
> Sender: owner-freebsd-current at freebsd.org
> On Wed, Aug 20, 2008 at 11:43:35PM +0200, Fabian Keil wrote:
> > Warner Losh <imp at bsdimp.com> wrote:
> > > From: Bakul Shah <bakul at bitblocks.com>
> > > Subject: Re: HEADSUP new usb code coming in.
> > > Date: Tue, 19 Aug 2008 14:18:13 -0700
> > >
> > > >
> > > > Accidentally unplugging a mounted USB disk (without
> > > > unmounting it) resulted in a hang or a crash. Is this fixed?
> > >
> > > That's fixed in -current right now with the old stack. It isn't a usb
> > > issue at all, but a buffer cache issue.
> > I can't confirm this for either msdosfs or geli (with ZFS).
> > In case of msdosfs the situation has been vastly improved
> > and the panic seems to be no longer guaranteed, but there's
> > still a fair chance it'll happen eventually.
> It was discussed now and then on freebsd-usb mailing list.
> Have a look at http://www.gulbra.net/freebsd-usb/
> As for the non-msdosfs formatted media, I am quite sure it is a really bad
> idea to unplug media before unmounting it (there is actually no difference
> between "removable" and "stationary" drives).
Today most pluggable media tends to be FAT32, but I suspect that we will
see growing use of NTFS and that may be a bigger issue. The last
portable drive I bought (SimpleTech 120 GB 2.5 inch) came NTFS
formatted.I imagine that ntfs-3g/fuse will be used much more widely and
the problem will get worse, again.
Any idea if there is a hope of making ntfs-3g tolerant of this in a
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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