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Filesystem won't mount because of "unsupported optional features (80)"

I made a filesystem (mke2fs -j) on a logical volume under kernel 2.6.20 on a 64-bit based system, and when I try to mount it, ext3 complains with

EXT3-fs: dm-1: couldn't mount because of unsupported optional features (80).

I first thought I just forgot to make the filesystem, so I remade it and the error is still present. I ran fsck on this freshly made filesystem, and it completed with no errors.

Here's the dumpe2fs -h info:
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          a4b7ee96-4aa9-4312-9ec9-91059539ece5
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features: has_journal resize_inode dir_index filetype 64bit sparse_super large_file
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              393216000
Block count:              786432000
Reserved block count:     39321600
Free blocks:              774032395
Free inodes:              393215989
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         16384
Inode blocks per group:   512
Filesystem created:       Fri Feb 16 20:00:51 2007
Last mount time:          n/a
Last write time:          Fri Feb 16 20:36:07 2007
Mount count:              0
Maximum mount count:      23
Last checked:             Fri Feb 16 20:36:07 2007
Check interval:           15552000 (6 months)
Next check after:         Wed Aug 15 21:36:07 2007
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               128
Journal inode:            8
Default directory hash:   tea
Directory Hash Seed:      a00b379c-0028-4659-93e8-b0a9198ed6c0
Journal backup:           inode blocks
Journal size:             128M

Here's the lvdisplay output on the logical volume:
--- Logical volume ---
  LV Name                /dev/vgw/lvhall
  VG Name                vgw
  LV UUID                eq696g-YyLS-xkwV-XGQf-ri1i-4bTK-RaN5s3
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                2.93 TB
  Current LE             768000
  Segments               2
  Allocation             inherit
  Read ahead sectors     0
  Block device           254:1

What could be causing this error and what does "80" refer to?

Maurice Volaski, mvolaski aecom yu edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University

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