freebsd stable - Jun 2006 - unmounting a filesystem safely that doesn't exist anymore

Hello,

I did a mistake: I unplugged my digital camera accidentally before I 
unmounted the filesystem. *doh* This happens very often, because I'm 
very scatterbrained. =) The kernel will panic and all filesystems remain 
unclean in any case now. I know that this is a well know issue and in 
past discussions you stated that this behaviour is intended and won't be 
changed ad hoc. I just want to know if somebody knows a workaround or 
small trick that prevents the other filesystems from being unclean on 
next boot-up.

Regards
Bj?rn

On Sat, 2006-Jun-10 19:40:41 +0200, Bjrn Knig wrote:
>I did a mistake: I unplugged my digital camera accidentally before I 
>unmounted the filesystem. *doh* This happens very often, because I'm 
>very scatterbrained. =)
Your best solution may be to use mtools (ports/emulators/mtools) rather
than mounting the filesystem.
>changed ad hoc. I just want to know if somebody knows a workaround or 
>small trick that prevents the other filesystems from being unclean on 
>next boot-up.
The only way to do this is to have all the other filesystems mounted
read-only.  The "filesystem clean" flag is part of the superblock and
is cleared when a filesystem is mounted.  It will be set only if the
filesystem is cleanly unmounted.

-- 
Peter Jeremy

Bj?rn K?nig wrote:
> Hello,
> 
> I did a mistake: I unplugged my digital camera accidentally before I
unmounted the
> filesystem. *doh* This happens very often, because I'm very
scatterbrained. =) The kernel
> will panic and all filesystems remain unclean in any case now. I know that
this is a well
> know issue and in past discussions you stated that this behaviour is
intended and won't be
> changed ad hoc. I just want to know if somebody knows a workaround or small
trick that
> prevents the other filesystems from being unclean on next boot-up.
You might give the automounter (am-utils) a whirl. They are very
confusing to set up, but you can set the unmount-if-unused timeout to
something like 5 seconds. This could narrow the window enough to not
panic you system frequently :)

Ulrich Spoerlein
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