Subject: Re: while we're looking at old bugs
To: John F. Woods <firstname.lastname@example.org>
From: Manuel BOUYER <email@example.com>
Date: 10/01/1997 10:46:50
On Sep 30, John F. Woods wrote
> kern/3021 describes poor handling of UNIT ATTENTION in the scsi
> driver. The sense code handling recently got churned, but I don't
> think this has been changed. At any rate, the bug doesn't seem to
> have been looked at. (This one includes only skeletal code.)
Hum, this one describe in fact 2 problems:
- poor handling of UNIT ATTENTION, which makes the device invalidated
when it shouldn't.
- Umount can't umount an invalidated disk, even with -f. In any case,
if one do umount -f, the FS should be umounted, discarding the datas
in caches if they can't be written.
Regarding the media change detection: This could be done at FS level,
at last for some of them: We could detect a media change by checking,
for example, the date of '/'. It is really unlikely that 2 file systems have
the same cration date, at a second precision. This would work at last for ffs,
ext2fs and I think cd9660. What about ados and MS-DOS ?
Do we need media change detection for other purpose that filesystem cache
Manuel Bouyer, LIP6, Universite Paris VI. Manuel.Bouyer@lip6.fr