From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch changes usr/scsi.c:scsi_cmd_perform() to first check to see if
the struct backingstore_template->bs_passthrough=1 for SG_IO, then
check for a valid struct device_type_template->cmd_passthrough()
function pointer to determine if the device supports SG_IO.
This patch then updates the device_type in usr/sb.c to enable the functionality
for TYPE_DISK.
Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
---
usr/sbc.c | 1 +
usr/scsi.c | 11 +++++++++++
usr/tgtd.h | 1 +
3 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/usr/sbc.c b/usr/sbc.c
index a048d53..d53f7f9 100644
--- a/usr/sbc.c
+++ b/usr/sbc.c
@@ -269,6 +269,7 @@ static struct device_type_template sbc_template = {
.lu_online = spc_lu_online,
.lu_offline = spc_lu_offline,
.lu_exit = spc_lu_exit,
+ .cmd_passthrough = sbc_rw,
.ops = {
{spc_test_unit,},
{spc_illegal_op,},
diff --git a/usr/scsi.c b/usr/scsi.c
index cef231b..1db786e 100644
--- a/usr/scsi.c
+++ b/usr/scsi.c
@@ -242,6 +242,17 @@ int scsi_cmd_perform(int host_no, struct scsi_cmd *cmd)
if (spc_access_check(cmd))
return SAM_STAT_RESERVATION_CONFLICT;
+ /*
+ * Use dev_type_template->cmd_passthrough() for usr/bs_sg.c devices
+ */
+ if (cmd->dev->bst->bs_passthrough) {
+ if (!(cmd->dev->dev_type_template.cmd_passthrough)) {
+ eprintf("cmd->dev->dev_type_template.cmd_passthrough()"
+ " is NULL!\n");
+ return SAM_STAT_CHECK_CONDITION;
+ }
+ return cmd->dev->dev_type_template.cmd_passthrough(host_no, cmd);
+ }
return cmd->dev->dev_type_template.ops[op].cmd_perform(host_no, cmd);
}
diff --git a/usr/tgtd.h b/usr/tgtd.h
index 4f26a29..f8ee47f 100644
--- a/usr/tgtd.h
+++ b/usr/tgtd.h
@@ -108,6 +108,7 @@ struct device_type_template {
int (*lu_config)(struct scsi_lu *lu, char *args);
int (*lu_online)(struct scsi_lu *lu);
int (*lu_offline)(struct scsi_lu *lu);
+ int (*cmd_passthrough)(int, struct scsi_cmd *);
struct device_type_operations ops[256];
--
1.5.6.5
--
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