[ag-automation] Problem reading RBF filesystem on SCSI disk

[Carsten Emde]

Piotr,

>> If you already dd'ed the image to disk, did you try this?
>> # mount -t rbf -o loop /path/to/image /mnt
> I tried mount a  RBF image via loopback device. It failed:
> dmesg output:
> [..]
> RBF invalid inode loop0:000000e9
Okay. This is a reasonable error message.

> Gzipped dump of  bootsector is attached (bootsec.gz). I hope it will
> help to debug.
Yes, indeed, it helped. I have bad news, though.

These are the first 16 Bytes of the root sector:
1C FD E8 21 E7 F0 00 04 00 00 E9 00 00 FF F2 F0
\-----/  |  \--/  \--/  \------/
  total   |    |  cluster   LSN
sectors  |    |   size     of
          |    |           root
       sectors |         directory
         per   |
        track  |
              number
             of bytes
           in alloc map

As you can see, the logical sector number of the root directory is
0x0000e9. Since the sector size is 256 Bytes, the offset of the root
directory is 0xe900.

Let's have a look at this location:

E900: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  ................
E910: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  ................
E920: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  ................
E930: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  ................
etc.

Thus, the error message "BF invalid inode loop0:000000e9" makes sense:
The entire root directory has been erased, intentionally or accidentally.

	cbe