On Sun, Apr 10, 2005 at 11:47:04PM +0200, Klaus Heinz wrote:
> bouyer@netbsd.org wrote:
> > browsing vnd-related PRs, I noticed this one. Is it still a problem ?
> > I've used vnd to build msdos images on newer NetBSD releases and didn't run
> > into this ...
> 
> Output from the second fsck_msdos on NetBSD/i386 1.6.2 (this was the
> machine where i submitted the original PR with 1.5.2).
> 
>   # fsck_msdos -y /dev/rvnd0a
>   ** /dev/rvnd0a
>   ** Phase 1 - Read and Compare FATs
>   ** Phase 2 - Check Cluster Chains
>   ** Phase 3 - Checking Directories
>   /2.TXT starts with free cluster
>   Truncate? yes
>   /7.TXT starts with free cluster
>   Truncate? yes
>   /C.TXT starts with free cluster
>   Truncate? yes
>   ** Phase 4 - Checking for Lost Files
>   15 files, 1418 free (2836 clusters)
> 
>   ***** FILE SYSTEM WAS MODIFIED *****
> 
> Output from NetBSD/i386 2.0 (completely different machine, installed
> from the official 2.0 sets):
> 
>   # fsck_msdos -y /dev/rvnd0a
>   ** /dev/rvnd0a
>   ** Phase 1 - Read and Compare FATs
>   Cluster 376 is marked free in FAT 0, as EOF in FAT 1
>   use FAT 0's entry? yes
>   Cluster 414 is marked free in FAT 0, as EOF in FAT 1
>   use FAT 0's entry? yes
>   Cluster 570 is marked free in FAT 0, as EOF in FAT 1
>   use FAT 0's entry? yes
>   Cluster 685 is marked free in FAT 0, as EOF in FAT 1
>   use FAT 0's entry? yes
>   ** Phase 2 - Check Cluster Chains
>   ** Phase 3 - Checking Directories
>   /0.TXT starts with free cluster
>   Truncate? yes
>   /2.TXT starts with free cluster
>   Truncate? yes
>   /6.TXT starts with free cluster
>   Truncate? yes
>   /C.TXT starts with free cluster
>   Truncate? yes
>   ** Phase 4 - Checking for Lost Files
>   Update FATs? yes
>   Unable to write FAT (Read-only file system)
>   ***** FILE SYSTEM WAS MODIFIED *****
> 
> If I run the script several times I never get exactly the same
> messages from fsck.

Hum. What happens if you use vnd0d instead ? Only the raw partition
has the first 2 sectors writable, this may be what cause the problem here.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--