Quoting Theodore Ts'o (2014-09-02 15:50:14)
> On Tue, Sep 02, 2014 at 01:59:34PM +0200, 4win...@informatik.uni-hamburg.de 
> wrote:
> > Package: e2fsprogs
> > Version: 1.42.12-1
> > Severity: normal
> > Tags: patch
> > 
> > Dear Maintainer,
> > 
> > e2fsck accesses the field osd2.linux2.l_i_file_acl_high field without
> > checking that the filesystem is indeed created for Linux.  This leads
> > to e2fsck constantly complaining about certain nodes:
> > 
> > i_file_acl_hi for inode XXX (/dev/console) is 32, should be zero.
> > 
> > By "correcting" this problem, e2fsck clobbers the field
> > osd2.hurd2.h_i_mode_high.
> 
> Interesting; is this a field that hurd has recently started using?
> (We've had this check in e2fsck for 4 years, when we added support for
> 64-bit file systems.)

No. It has been used at least since 1996.  Amazingly this seems to
have no ill effect other than to make e2fsck complain constantly.

> If so, for what?

It seems to store more mode bits.

> And did the hurd developer who started using this field realize he
> has foreclosed the use of file systems larger than 16TB on the hurd?

Probably not.  We can switch to the Linux on-disk format once we can
store all Hurdish stuff in extended attributes though.

Thanks,
Justus


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