[PATCH 2/2] [bs_sg]: Add bs_sg_init() for STGT LUN passthrough

[PATCH 2/2] [bs_sg]: Add bs_sg_init() for STGT LUN passthrough

[Nicholas A. Bellinger]

From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch adds bs_sg_init() that is called from existing usr/target.c:tgt_device_create()
code via struct backingstore_template->bs_init() in order to setup the passthrough specific
queue and completion handlers for struct scsi_lu->cmd_perform() and ->cmd_done().

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
 usr/bs_sg.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/usr/bs_sg.c b/usr/bs_sg.c
index 8baa480..2fcb0d2 100644
--- a/usr/bs_sg.c
+++ b/usr/bs_sg.c
@@ -192,6 +192,25 @@ static int init_sg_device(int fd)
 	return 0;
 }
 
+static int bs_sg_init(struct scsi_lu *lu)
+{
+	/*
+	 * Setup struct scsi_lu->cmd_perform() passthrough pointer
+	 * (if available) for the underlying device type.
+	 */
+	lu->cmd_perform = &target_cmd_perform_passthrough;
+	if (!(lu->cmd_perform)) {
+		eprintf("Unable to locate lu->cmd_perform() for bs_sg\n");
+		return -1;
+	}
+	/*
+	 * Setup struct scsi_lu->cmd_done() passthrough pointer using
+	 * usr/target.c:__cmd_done_passthrough().
+	 */
+	lu->cmd_done = &__cmd_done_passthrough;
+	return 0;
+}
+
 static int bs_sg_open(struct scsi_lu *lu, char *path, int *fd, uint64_t *size)
 {
 	int sg_fd, err;
@@ -238,6 +257,7 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd)
 static struct backingstore_template sg_bst = {
 	.bs_name		= "sg",
 	.bs_datasize		= 0,
+	.bs_init		= bs_sg_init,
 	.bs_open		= bs_sg_open,
 	.bs_close		= bs_sg_close,
 	.bs_cmd_submit		= bs_sg_cmd_submit,
-- 
1.5.6.5