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From: Nicholas A. Bellinger on 6 Jun 2010 23:50
From: Nicholas Bellinger <nab(a)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(a)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(-)

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