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Old 08-16-2003, 01:57 PM   #1
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Registered: Aug 2003
Location: paris, france
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superblock corruption

while trying to build some software (OpenJade) to be able to run gnome 2.0 ... I had the message about an impossible mkdir command (I was logged as superuser !) and after that the partition which was holding the /usr tree was impossible to be mounted.

The superblock get corrupted with an inode count of 0 (nul) ???
I try desesperatly to run e2fsck with the argument -b 32769 to get a copy of the superblock, it didn't work !!! I tried the arguments -b 65537 , -b 98305 . all of these returned an error about a bad magic number ...

the command dumpe2fs returns some information as a blocksize of 4096, a blockgroup of 32768, a blockcount of 2097152 ...

Is there any way to recover a correct superblock ?
Old 08-17-2003, 05:01 AM   #2
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Location: Belgium - Europe
Distribution: RH 8, 9 and AS 2.1
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I had that kind of problems after a live partition resive on a server.
I actually used an option (s or b) of mkfs. Do go through the manpages though to make sure that's what you need...

Best of luck,
Old 08-18-2003, 11:18 AM   #3
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hi everybody,
hello ecb,
in fact I was able to run e2fsck on the corrupted partition, BUT instead of specifying an offset of 32769, which made e2fsck to answer about a bad magic number, I used the offset 32768.
At this location I found a "valid" superblock. e2fsck worked quite a long time but recovered part of my configuration.
I still had to reinstall a small part of the system software, and was able to recover quite a lot of my lost files.

anyway I am about to burn several backup CD's in case
long live to linux


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