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

Theodore Tso tytso at
Sun Feb 18 01:53:27 UTC 2007

On Sat, Feb 17, 2007 at 05:53:56PM -0500, Maurice Volaski wrote:
> Indeed, it appears that my initial assumption is correct. mke2fs 
> contains ext4dev code and it erroneously applies the 64bit flag to 
> filesystems > 2 TB by default. 

Are you using the e2fsprogs-interim patchset version
e2fsprogs-1.39-tyt1?  It should only be used for ext4dev development,
and nothing else.  I'll look at fixing that bug in
e2fsprogs-1.39-tyt1, but that code base has a bunch of interim patches
that I'm currently in the process of reworking for e2fsprogs mainline
inclusion; it's there only for the convenience of ext4 developers.

I've added a README to make this clear for future users.


						- Ted

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