Re: RAID, 2.4.2 and Buslogic

[Andreas Dilger <adilger@turbolinux.com>]

Jauder Ho writes:
> My story is somewhat similar to what Dick Johnson has encountered except
> this is with 2.4.2 running on a pentium 200.
> 
> EXT2-fs error (device md(9,0)): ext2_add_entry: bad entry in directory
> #343396:
> inode out of bounds - offset=0, inode=343396, rec_len=12, name_len=1
> EXT2-fs error (device md(9,0)): ext2_write_inode: bad inode number: 12
> 
> EXT2-fs error (device md(9,0)): free_inode: reserved inode or nonexistent
> inode
> kernel BUG at inode.c:885!

Inode 12 is a perfectly valid inode number for any filesystem, so your
ext2 superblock must have been corrupt (or zeroed out) at this point.
The value for sb->u.ext2_sb.s_es->s_inodes_count must have been < 12
(likely zero), which would explain all of these errors.  Strange.

I have posted (twice) a patch which would prevent the BUG from happening.
Granted, it won't help your RAID/SCSI corruption problem (*).  Please see

  [PATCH] sanity checks for ext2 root inode

in l-k archives.  I don't think this is in either Linus' or Alan's tree.

Cheers, Andreas

(*) in normal cases this prevents a small filesystem corruption from
    halting the system, but in your case, the BUG may have prevented
    larger corruption by halting the system before more damage was done?
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert