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Old 01-09-2007, 08:57 AM   #1
Cadmium
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Registered: May 2004
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Can't mount /home anymore


Hi!

I have a problem with mounting my home directory since my PC crashed.
The mount command gives me the following output:

# mount /dev/sda6 /mnt/tmp/
mount: wrong fs type, bad option, bad superblock on /dev/sda6,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

The partition /dev/sda6 is an ext3 file system. It also tried to specify the file system type with -text3 and to use a backup superblock with the sb option but it does not help.

I tried to run fsck but it does not fix the problem either. Here is the output of fsck:

# fsck.ext3 /dev/sda6
e2fsck 1.39 (29-May-2006)
Group descriptors look bad... trying backup blocks...
Inode bitmap for group 522 is not in group. (block 3271884801)
Relocate<y>? yes

fsck.ext3: e2fsck_read_bitmaps: illegal bitmap block(s) for /home

I'll appreciate any help on this topic because I tried anything I could think of by myself and I still can't mount my home.
Any suggestions?

Best wishes!
Cd
 
Old 01-09-2007, 06:40 PM   #2
shorty943
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Location: Tailem Bend. South Australia
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More information needed. What is your distro? What is your machine? Do you have a dump file in your sys logs, that may point to the reason for the crash? It appears, from your post, you have not yet followed the kernel message, about checking syslog, and dmesg. Do this, as it will give us the information we need to hunt down the reason for the crash.
I did notice an entry regarding, an illegal bitmap block in /home.
Sadly it may be that your SATA disk is broken, some how not really likely, yet.
As a last resort, you may have to do a re-install. However, this will probably not save any vital data on the disk. Sadly, again, if your inode and super blocks have been corrupted, it may be too late.
Of course, I am not a guru, simply a hobbyist user, so some one who actually has more education in the system may be of a lot more help to you.

Shorty943.

Last edited by shorty943; 01-09-2007 at 06:46 PM.
 
Old 01-09-2007, 07:10 PM   #3
xjlittle
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Registered: Aug 2003
Location: Indiana
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I found this where some of the ext3 hackers hang out at http://www.arcknowledge.com/gmane.co.../msg00035.html

I hope it helps..

Quote:
My apologies for not responding sooner. You have the bad misfortune
of having your disk go south the day before the Kernel Summit and
Ottawa Linux Symposium started, so many of the ext2/3 hackers have
been rather busy and distracted for this past week.

It looks like your block group descriptors have gotten totally
trashed. You mentioned that your backup superblock didn't seem to
have anything useful; did you try any of the other backup superblocks?
You can find their locations by using "mke2fs -n /dev/hda1". The -n
option cause mke2fs to not actually *do* anything, but just display
what it would have displayed when it ran, which includes printing out
the backup superblock blocks. Something that might be worth doing is
to use dumpe2fs, specifying the block size and backup superblock
location, and see if any of the backup locations look sane. Checking
to see if the backup group descriptors are showing the same or
different information from the primary would also be of interest in
trying to determine what actually happened.

If you can't find any good backup group descriptors, something to try
is the -S option to mke2fs. You didn't specify how big this
filesystem was, but if you can manage to do a disk-to-disk image
backup, it would be a good idea to do this before you try mke2fs -S,
since this will overwrite the superblock and block group descriptors
with newly initialized versions. This has the potential of completely
trashing your filesystem if you don't specify *exactly* the same
arguments to mke2fs as you used when you first created the filesystem
(i.e., the blocksize, number of blocks, filesystem type if you
specified it, etc., all have to be exactly the same). Read the man
pages for more details, but as a last resort, it's certainly worth a
try.

 
Old 01-11-2007, 03:53 AM   #4
Cadmium
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Registered: May 2004
Posts: 31

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Hi!

Thanks for the link! Sounds promissing.

The crash is due to a power cut and I'm running Mandriva 2007 i586. There was no trace in the system log files. I don't think the disk itself is damaged. Furthermore, other (bootable) partitions on the same disk are doing fine. I don't wish to reinstall anything on /home or to format as I will loose my data.

Anyone else that could help me with mounting this /home partition again?

Cheers,
Cd
 
Old 01-11-2007, 04:20 AM   #5
pwc101
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Registered: Oct 2005
Location: UK
Distribution: Slackware
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Quote:
Originally Posted by Cadmium
The partition /dev/sda6 is an ext3 file system. It also tried to specify the file system type with -text3 and to use a backup superblock with the sb option but it does not help.
When you mounted this manually, did you put the -t flag in exactly as you have written it? If so, try again with a space between -t and ext3: "-t ext3" rather than "-text3".
 
  


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