ext2fs_read_bb_inode: Invalid argument && Can't read an block bitmap

[Hans-Joachim Picht]

Hello,

sorry if the question was asked a couple of times before but I couldn't
find any useful hinds to this problem using google and the listman
search-engine of the archive of this list.

Somehow the ext3 filesystem on one of my machines died an after a reboot
grub wouldn't come up again.

What I did so far:

fsck -y /dev/hda4


    fsck 1.35 (28-Feb-2004)
    e2fsck 1.35 (28-Feb-2004)
    Group descriptors look bad... trying backup blocks...
    Block bitmap for group 0 is not in group.  (block 2553887680)
    Relocate? yes

    Inode bitmap for group 0 is not in group.  (block 16777216)
    Relocate? yes

    Inode table for group 0 is not in group.  (block 2238581760)
    WARNING: SEVERE DATA LOSS POSSIBLE.
    Relocate? yes

     [ more like this ]

    Block bitmap for group 127 is not in group.  (block 0)
    Relocate? yes

    Inode bitmap for group 127 is not in group.  (block 0)
    Relocate? yes

    Inode table for group 127 is not in group.  (block 0)
    WARNING: SEVERE DATA LOSS POSSIBLE.
    Relocate? yes

    fsck.ext2: e2fsck_read_bitmaps: illegal bitmap block(s) for /dev/hda4

 dd if=/dev/hda of=/dev/sda conv=noerror,sync

 dumpe2fs /dev/sda4

dumpe2fs 1.35 (28-Feb-2004)
ext2fs_read_bb_inode: Invalid argument
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          a300ff1d-5cf0-4d8a-9336-ae39bc64ed95
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal filetype sparse_super large_file
Default mount options:    (none)
Filesystem state:         clean with errors
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              7274496
Block count:              14542841
Reserved block count:     727142
Free blocks:              1454431
Free inodes:              4906461
First block:              0
Block size:               4096
Fragment size:            4096
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         16384
Inode blocks per group:   512
Last mount time:          Thu Mar 17 09:17:22 2005
Last write time:          Tue Mar 22 18:11:10 2005
Mount count:              35
Maximum mount count:      100
Last checked:             Thu Mar  3 09:12:04 2005
Check interval:           0 (<none>)
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:		  128
Journal inode:            8
First orphan inode:       775060
Journal backup:           inode blocks

Group 0: (Blocks 0-32767)
  Primary superblock at 0, Group descriptors at 1-4
  Block bitmap at 2553887680, Inode bitmap at 16777216 (+16777216)
  Inode table at 2238581760-2238582271
  5376 free blocks, 4096 free inodes, 0 directories
Group 1: (Blocks 32768-65535)
  Backup superblock at 32768, Group descriptors at 32769-32772
  Block bitmap at 0, Inode bitmap at 822088960 (+822056192)
  Inode table at 33554432-33554943 (+33521664)
  20480 free blocks, 6016 free inodes, 0 directories
Group 2: (Blocks 65536-98303)
  Block bitmap at 33554432 (+33488896), Inode bitmap at 2789758720
  Inode table at 33554432-33554943 (+33488896)

[...]

Group 443: (Blocks 14516224-14542840)
  Block bitmap at 14516224 (+0), Inode bitmap at 14516225 (+1)
  Inode table at 14516231-14516742 (+7)
  20485 free blocks, 16165 free inodes, 0 directories

dumpe2fs: /dev/sda4: error reading bitmaps: Can't read an block bitmap

dumpe2fs -b /dev/sda4

    dumpe2fs 1.35 (28-Feb-2004)
    ext2fs_read_bb_inode: Invalid argument

Any hinds what to do?

With best regards,

    Hans-Joachim Picht

-- 
Picht Consulting				http://www.picht.org
Hans-Joachim Picht				hans at picht.org
Eichgaertenallee 88				Tel. +49 (0)641 41 600
35394 Giessen, Germany				Fax. +49 (0)641 41 300