How to interpret corruption error message

[Jeffrey W. Baker]

(sort-of xposted from linux-kernel)

Hi,

I am wondering how to interpret this error message, which popped up on a
2.4.26 SMP x86 box two days ago:

EXT2-fs: corrupt root inode, run e2fsck
init_special_inode: bogus imode (37316)
EXT2-fs: corrupt root inode, run e2fsck
init_special_inode: bogus imode (37316)
EXT2-fs: corrupt root inode, run e2fsck

The problem is, the error message doesn't indicate *which* filesystem we
are talking about, and I have three mounted: 1 ext2 and 2 ext3.  The
ext2 is on a plain old pata disk and the two ext3 filesystems are on
software raid5 sata volumes.

I'm pretty much afraid to reboot the machine at this point, I have no
idea which FS I'm about to lose.  Any hints appreciated.

-jwb