This patch added a function tcmu_gen_it_nexus() which can help
generate a string contain IT_Nexus information from a session.
Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx>
---
drivers/target/target_core_user.c | 44 +++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index d368c656ef79..26d8aee40719 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1769,6 +1769,50 @@ static int tcmu_set_dev_pr_info(struct tcmu_dev *udev, void *val)
return tcmu_send_set_pr_info_event(udev, val);
}
+static int
+tcmu_gen_it_nexus(struct se_session *se_sess,
+ char *nexus_buf,
+ size_t buflen)
+{
+ struct se_portal_group *se_tpg;
+ const struct target_core_fabric_ops *tfo;
+ u32 tpg_tag = 0;
+ char *tpg_wwn = "";
+ int rc;
+
+ if (!se_sess || !se_sess->se_node_acl || !se_sess->se_tpg
+ || !se_sess->se_tpg->se_tpg_tfo) {
+ pr_warn("invalid session for IT nexus generation\n");
+ return -EINVAL;
+ }
+
+ se_tpg = se_sess->se_tpg;
+ tfo = se_tpg->se_tpg_tfo;
+
+ /*
+ * nexus generation may be coming from an xcopy, in which case tfo
+ * refers to xcopy_pt_tfo (tpg_get_wwn and tpg_get_tag are NULL).
+ */
+ if (tfo->tpg_get_tag)
+ tpg_tag = tfo->tpg_get_tag(se_tpg);
+ if (tfo->tpg_get_wwn)
+ tpg_wwn = tfo->tpg_get_wwn(se_tpg);
+
+ rc = snprintf(nexus_buf, buflen, "%s,i,0x%llx,%s,t,0x%x",
+ se_sess->se_node_acl->initiatorname,
+ se_sess->sess_bin_isid,
+ tpg_wwn,
+ tpg_tag);
+ if ((rc < 0) || (rc >= buflen)) {
+ pr_debug("error formatting reserve cookie\n");
+ return -EINVAL;
+ }
+
+ pr_debug("generated nexus: %s\n", nexus_buf);
+
+ return 0;
+}
+
static int tcmu_configure_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
--
2.17.1
--
To unsubscribe from this list: send the line "unsubscribe target-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
