Re: [PATCH] fs: efs: Fix compilation bug and use pr_debug()

[Matthew Wilcox <willy@infradead.org>]

On Thu, Jun 04, 2026 at 10:33:10PM -0500, Maxwell Doose wrote:
> On Thu, Jun 4, 2026 at 10:27 PM Matthew Wilcox <willy@infradead.org> wrote:
> >
> > On Thu, Jun 04, 2026 at 10:16:44PM -0500, Maxwell Doose wrote:
> > > ps: I noticed this was listed as an orphan in MAINTAINERS. I'd be
> > > happy to step up and maintain this, I've got a bit of experience
> > > maintaining stuff in iio. Hopefully this isn't too far-fetched!
> >
> > I'd be just as happy to see it deleted.  efs was succeeded by XFS in
> > the mid-90s.  The last efs filesystem I personally saw was in 1999 (an
> > SGI Freeware CD).  If there's any filesystem crying out to be converted
> > to FUSE and removed from the kernel, this is it.
> 
> I guess that is a fair point. But given the fact that we quite
> literally just found a compile-time bug I think there may be further
> underlying issues that need to be resolved before conversion to FUSE
> :/

I'd argue that shows the exact opposite.  efs just isn't useful any more.
While looking up some information on Wikipedia, I discovered that XFS
filesystems from SGI used v2 of the directory format.  Linux no longer
supports anything from before v4 (and even that is now under a CONFIG
option).  So we're in the weird situation where SGI filesystems from
1992 are readable in Linux, but SGI filesystems from 1995 are not.