linux-kernel - Re: remove exofs and the T10 OSD code V2

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Message-ID: <1541006979.196084.138.camel@acm.org>
Date:   Wed, 31 Oct 2018 10:29:39 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Boaz Harrosh <ooo@...ctrozaur.com>, Christoph Hellwig <hch@....de>,
        martin.petersen@...cle.com
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        osd-dev@...n-osd.org, linux-scsi@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: remove exofs and the T10 OSD code V2

On Wed, 2018-10-31 at 18:34 +0200, Boaz Harrosh wrote:
> On 27/10/18 11:20, Christoph Hellwig wrote:
> > The only real user of the T10 OSD protocol, the pNFS object layout
> > driver never went to the point of having shipping products, and we
> > removed it 1.5 years ago.  Exofs is just a simple example without
> > real life users.
> > 
> > The code has been mostly unmaintained for years and is getting in the
> > way of block / SCSI changes, so I think it's finally time to drop it.
> > 
> > Quote from Boaz:
> > 
> > "As I said then. It is used in Universities for studies and experiments.
> > Every once in a while. I get an email with questions and reports.
> > 
> > But yes feel free to remove the all thing!!
> 
> I think I'm changing my mind about this.
> [ ... ]

The osd driver was accepted in the upstream kernel in 2009. I have checked all
commits in Linus' tree for the osd driver that went in since 2009. All changes
made by other kernel developers than you are the result of tree-wide refactoring,
compiler warning fixes, fixes for issues detected by static source code
analyzers or spelling fixes. Hence my question: how big is the user base of the
exofs and osd kernel drivers? 

Thanks,

Bart.