Date: Tue, 6 Feb 2001 22:36:02 -0800 (PST) From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Bruce Evans <bde@zeta.org.au> Cc: FreeBSD Current <freebsd-current@FreeBSD.ORG> Subject: Re: DEVFS and ms-dos partitions Message-ID: <200102070636.f176a2f14720@troutmask.apl.washington.edu> In-Reply-To: <Pine.BSF.4.21.0102071652490.31427-100000@besplex.bde.org> from Bruce Evans at "Feb 7, 2001 05:08:05 pm"
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Bruce Evans wrote:
> On Tue, 6 Feb 2001, Steve Kargl wrote:
>
> >
> > d-------w- 1 root 493 arch 4096 Jan 1 1980 msdos/
> >
> > The source in src/sbin/mount_msdos has changed in a long time,
not
> > so is this a side effect of using DEVFS?
>
> This is caused by the same bug that cause panics for exporting
> filesystems (things in mount structs moving around whenever the size
> of struct mtx changes). struct msdosfs_args is particularly well
> designed to be affected by this bug even when nothing is exported:
>
[snip of struct]
> The fields after the export field become garbage when the size of the
> export field changes. The garbage is easy to see using `ls -ld /msdos'.
Hmmm, thanks for the explanation. That o+w permission is
a little worrisome. I take it there's no way to force a
a different mode on the directory (short of never getting
world and kernel out-of-sync, which makes chasing the last
mutex bugs much more fun).
Mea culpa: I know better. It is a slice not a partition.
--
Steve
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