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Hello,
Recently I started to experience a problem mounting encrypted loopback filesystems, a problem very much like what Gabor Gludovatz has reported on this list before. What happens is that mount gives me the following error message when I run it on a loopback file:
EXT2-fs error (device loop(7,1)): ext2_check_descriptors: Block bitmap for group 16 not in group (block 4162330020)!
EXT2-fs: group descriptors corrupted !
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
or too many mounted file systems
This happened with files that I had burned on cd/rw media - therefor I'm pretty sure the content of the files hasn't changed between the time where it did work and now. After burning them I copied them over to my harddrive again and tried to loopback them to make sure everything was still there. This worked fine. However, after I moved to a different machine I started to experience the abovementioned problem.
I've experienced this with 3 different files now, so it seems like file corruption wouldn't be the problem. All these files were created using the 2.2.20 kernel with patch-int-2.2.18.3 applied. My system runs Debian, and when I moved to a different machine, instead of using Sid I started using Woody. The difference between the two is that Sid uses util-linux-2.11n4 whereas Woody has util-linux-2.11n2 - this seems to be the only package the would relate to the problem. The difference between these two versions of util-linux seems to be purely packaging-related, though. On both systems, I used the same kernel-image package (namely, the one I had compiled myself).
The one thing I'm rather anxious to know is, is there still a way to retrieve the contents of these files?
Will switching to 512byte IV calculations do me any good after I have formatted the filesystem and put data on it?
thanks in advance!
- - mailerror
>On Wed, 2001-12-05 at 14:07, Stephen.Thompson@bmwfin.com wrote:
>> I find that formatting it twice works.
>
>the reason of which btw has to do with soft blocksize;
>(which get's changed when you mount it the first time, and then stays
>that way when re-mkfs'ing...)
>
>I highly recommend to switch to 512byte IV calculation (which will
>become the default for the int. patch) in order to avoid such problems..
>
>regards,
>--
>Herbert Valerio Riedel / Phone: (EUROPE) +43-1-58801-18840
>Email: hvr@hvrlab.org / Finger hvr@gnu.org for GnuPG Public Key
>GnuPG Key Fingerprint: 7BB9 2D6C D485 CE64 4748 5F65 4981 E064 883F
>4142
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