[stgt] [PATCH 0/3] Add proper STGT <-> bs_sg passthrough v3

FUJITA Tomonori fujita.tomonori at lab.ntt.co.jp
Mon Jun 7 08:45:27 CEST 2010

On Sun,  6 Jun 2010 20:50:15 -0700
"Nicholas A. Bellinger" <nab at linux-iscsi.org> wrote:

> From: Nicholas Bellinger <nab at linux-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 at linux-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

Let's leave bsg support alone and focus on the sg support for now.
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