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

Maurice Volaski mvolaski at
Sun Feb 18 02:57:20 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'm using Gentoo and it has e2fsprogs-1.39-r1. It says at that this version 
contains a number of ext4 patches, but I'm not certain if it is 
equivalent to tyt1 or not.

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

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