[PATCH] Adding a new backend for opening a /dev/sg device for

[Ronnie Sahlberg]

passthrough mode

Adding a nev device type for passthrough operation

To use this mode use something like this :
tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1
--device-type=pt
-b /dev/sg0

Signed-off-by: Ronnie Sahlberg <ronniesahlberg at gmail.com>
---
 usr/Makefile |    9 +++++----
 usr/target.c |    9 ++++-----
 usr/tgtd.h   |    2 +-
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/usr/Makefile b/usr/Makefile
index 4245709..7081642 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -11,7 +11,7 @@ CFLAGS += -DISCSI
 TGTD_OBJS += $(addprefix iscsi/, conn.o param.o session.o \
 		iscsid.o target.o chap.o transport.o iscsi_tcp.o \
 		isns.o libcrc32c.o)
-TGTD_OBJS += bs_rdwr.o bs_aio.o
+TGTD_OBJS += bs_rdwr.o bs_aio.o bs_passthrough.o

 LIBS += -lcrypto
 ifneq ($(ISCSI_RDMA),)
@@ -43,21 +43,22 @@ TGTD_OBJS += $(addprefix fcoe/,\
 	fcoe_if.o fcoe_dev.o \
 	sa_event.o sa_timer.o sa_hash_kern.o sa_state.o\
 	crc32_le.o crc32_le_tab.o)
-TGTD_OBJS += bs_rdwr.o
+TGTD_OBJS += bs_rdwr.o bs_passthrough.o
 endif

 INCLUDES += -I. -I../include -I$(KERNELSRC)/include

 CFLAGS += -D_GNU_SOURCE
 CFLAGS += $(INCLUDES)
-CFLAGS += -g -O2 -Wall -Wstrict-prototypes -fPIC
+CFLAGS += -g -O0 -Wall -Wstrict-prototypes -fPIC

 LIBS += -lpthread

 PROGRAMS += tgtd tgtadm
 SCRIPTS += ../scripts/tgt-setup-lun
 TGTD_OBJS += tgtd.o mgmt.o target.o scsi.o log.o driver.o util.o work.o \
-		parser.o spc.o sbc.o mmc.o osd.o scc.o smc.o ssc.o bs_ssc.o bs.o
+		parser.o spc.o sbc.o mmc.o osd.o passthrough.o scc.o \
+		smc.o ssc.o bs_ssc.o bs.o
 MANPAGES = ../doc/manpages/tgtadm.8 ../doc/manpages/tgt-setup-lun.8

 TGTD_DEP = $(TGTD_OBJS:.o=.d)
diff --git a/usr/target.c b/usr/target.c
index 70bf72a..e200471 100644
--- a/usr/target.c
+++ b/usr/target.c
@@ -1524,21 +1524,20 @@ static struct {
 	{TYPE_ENCLOSURE, "enclosure"},
 	{TYPE_RBC, "rbc"},
 	{TYPE_OSD, "osd"},
-	{TYPE_NO_LUN, "No LUN"}
+	{TYPE_NO_LUN, "No LUN"},
+	{TYPE_SPT, "passthrough"}
 };

 static char *print_type(int type)
 {
 	int i;
-	char *name = NULL;

 	for (i = 0; i < ARRAY_SIZE(disk_type_names); i++) {
 		if (disk_type_names[i].value == type) {
-			name = disk_type_names[i].name;
-			break;
+			return disk_type_names[i].name;
 		}
 	}
-	return name;
+	return "Unknown type";
 }


diff --git a/usr/tgtd.h b/usr/tgtd.h
index 4febcd3..a649129 100644
--- a/usr/tgtd.h
+++ b/usr/tgtd.h
@@ -60,7 +60,7 @@ struct lu_phy_attr {

 	uint16_t version_desc[VERSION_DESCRIPTOR_LEN];

-	char device_type;	/* Peripheral device type */
+	unsigned char device_type;/* Peripheral device type */
 	char qualifier;		/* Peripheral Qualifier */
 	char removable;		/* Removable media */
 	char online;		/* Logical Unit online */
-- 
1.5.5

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