linux-kernel - Re: [PATCH] SCSI: userspace cannot use scsi_command_size_tbl, COMMAND_SIZE and scsi_device

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Date:	Sun, 28 Jun 2009 08:52:04 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Matthew Wilcox <matthew@....cx>, Sam Ravnborg <sam@...nborg.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Benny Halevy <bhalevy@...asas.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	James Smart <James.Smart@...lex.Com>
Subject: Re: [PATCH] SCSI: userspace cannot use scsi_command_size_tbl,
 COMMAND_SIZE and scsi_device_type

On Sun, 2009-06-28 at 00:10 +0530, Jaswinder Singh Rajput wrote:
> On Sat, 2009-06-27 at 12:28 -0600, Matthew Wilcox wrote:
> > On Sat, Jun 27, 2009 at 11:26:28PM +0530, Jaswinder Singh Rajput wrote:
> > > > On Sat, 2009-06-27 at 22:35 +0530, Jaswinder Singh Rajput wrote:
> > > > > userspace cannot use scsi_command_size_tbl, COMMAND_SIZE
> > > > > and scsi_device_type defined in kernel
> > 
> > When did we start exporting include/scsi to userspace?  I thought glibc
> > had its own separate definitions.
> > 
> 
> commit 9e4f5e29610162fd426366f3b29e3cc6e575b858
> Author: James Smart <James.Smart@...lex.Com>
> Date:   Thu Mar 26 13:33:19 2009 -0400
> 
>     [SCSI] FC Pass Thru support

That's what you get from a simplistic view.

If you look at the full history, scsi.h and sg.h were exported in 2006
by the initial commit by David Woodhouse

commit 8555255f0b426858d8648c6206b70eb906cf4ec7
Author: David Woodhouse <dwmw2@...radead.org>
Date:   Sun Jun 18 12:14:01 2006 +0100

    Add generic Kbuild files for 'make headers_install'

They were unexported again a year later, apparently on grounds of
clashing with /usr/include/scsi from glibc:

commit e629a7ddc0188e1bb9e956e698a9bd00c19c9854
Author: Olaf Hering <olh@...e.de>
Date:   Tue Oct 16 23:27:01 2007 -0700

    do not export /usr/include/scsi in make headers_install

So perhaps the meta question is how are we supposed to resolve this?
Glibc ceded it's copy of /usr/include/linux to the kernel headers
package, so it looks to be an oversight that it still
retains /usr/include/scsi (there's nothing extra in there in glibc
beyond what SCSI exports).

James


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