linux-kernel - Re: [PATCH 0/3] Add proper STGT <-> bs

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Date:	Tue, 20 Jul 2010 16:17:00 -0700
From:	James Bottomley <James.Bottomley@...e.de>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	stgt@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, michaelc@...wisc.edu,
	bharrosh@...asas.com, dgilbert@...erlog.com
Subject: Re: [PATCH 0/3] Add proper STGT <-> bs_sg passthrough v3

On Mon, 2010-06-07 at 17:19 -0700, Nicholas A. Bellinger wrote:
> On Tue, 2010-06-08 at 08:45 +0900, FUJITA Tomonori wrote:
> > On Mon, 07 Jun 2010 01:27:16 -0700
> > "Nicholas A. Bellinger" <nab@...ux-iscsi.org> wrote:
> > 
> > > On Mon, 2010-06-07 at 15:45 +0900, FUJITA Tomonori wrote:
> > > > On Sun,  6 Jun 2010 20:50:15 -0700
> > > > "Nicholas A. Bellinger" <nab@...ux-iscsi.org> wrote:
> > > > 
> > > > > From: Nicholas Bellinger <nab@...ux-iscsi.org>
> > > > > 
> > > > > Greeting STGT folks,
> > > > > 
> > > > > This is the third round of patches for adding proper LUN passthrough support into STGT
> > > > > using struct scsi_lu->cmd_perform() and struct scsi_lu->cmd_done() callers with existing
> > > > > SG_IO and the new BSG v4 backstores.
> > > > > 
> > > > > Following Tomo-san's input, the changelog between v2 -> v3 is as follows:
> > > > > 
> > > > > 1) Add struct device_type_template sg_template for SG_IO and BSG in usr/bs_sg.c instead
> > > > >    of making changes to usr/sbc.c
> > > > > 
> > > > > 2) Add struct backingstore_template->bs_passthrough member of type int for SG_IO and BSG.
> > > > > 
> > > > > 3) In usr/target.c:tgt_device_create() pass bst->bs_passthrough into device_type_lookup()
> > > > >    and for passthrough case use the new device_type_passthrough() to locate
> > > > >    struct device_type_template sg_template.
> > > > > 
> > > > > 4) Remove unnecessary post_cmd_done() from usr/target.c:__cmd_done_passthrough()
> > > > > 
> > > > > This patch series has been tested with STGT/iSCSI using 'sg'+'bsg' and 'rdwr' for non
> > > > > passthrough mode backstores into TCM_Loop LLD emulated iSCSI target ports.
> > > > > 
> > > > > Best,
> > > > > 
> > > > > Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org
> > > > > 
> > > > > Nicholas Bellinger (3):
> > > > >   [tgt]: Add proper STGT LUN backstore passthrough support (rev 3)
> > > > >   [tgt]: Add bs_sg struct device_type_template sg_template and struct
> > > > >     backingstore_template->bs_init()
> > > > >   [tgt]: Add BSG v4 backstore support to usr/bs_sg.c
> > > > > 
> > > > >  usr/bs_sg.c     |  247 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
> > > > >  usr/scsi_cmnd.h |    7 ++
> > > > >  usr/target.c    |  113 +++++++++++++++++++++++---
> > > > >  usr/tgtd.h      |   16 ++++
> > > > >  4 files changed, 362 insertions(+), 21 deletions(-)
> > > > 
> > > > The first and second patches Look fine overall. I have some comments
> > > > and wrote some cleanup patches.
> > > > 
> > > > I've put the first two patches with my cleanups:
> > > > 
> > > > git://git.kernel.org/pub/scm/linux/kernel/git/tomo/tgt.git pass
> > > > 
> > > > Can you confirm that it works for you? Then I can merge them into
> > > > master.
> > > 
> > > The pass branch works fine using '-E sg -Y pt' for SG_IO backstore <->
> > > fabric LUN assocation with TCM_Loop LLD Target Ports.  Thanks for
> > > cleaning things up to use TYPE_PT btw, I should have asked about that
> > > earlier. ;)
> > 
> > Thanks for the confirmation. I've merged these patches into master.
> > 
> > I'll merge your bsg patch if nobody complains about dropping sg
> > support in a few days.
> > 
> 
> Perfect, thank you Tomo-san.

Ping on this ... is it actually all working and we could remove the STGT
code in favour of this?

James


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