This patch added a function tcmu_execute_pr_register_existing()
which will handle Persistent Reservation registration for a
currently registered IT_Nexus.
Signed-off-by: Zhu Lingshan <lszhu@xxxxxxxx>
---
drivers/target/target_core_user.c | 34 +++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index a6e951f04065..4b426a9061b1 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -2614,6 +2614,40 @@ static int tcmu_pr_info_unregister_reg(struct tcmu_pr_info *pr_info,
return 0;
}
+/* handle PR registration for a currently registered I_T nexus */
+static sense_reason_t
+tcmu_execute_pr_register_existing(struct tcmu_pr_info *pr_info,
+ u64 old_key, u64 new_key, char *it_nexus,
+ struct tcmu_pr_reg *existing_reg,
+ bool ignore_existing)
+{
+ sense_reason_t ret;
+ int rc;
+
+ pr_debug("PR registration for registered nexus: %s\n", it_nexus);
+
+ if (!ignore_existing && (old_key != existing_reg->key)) {
+ ret = TCM_RESERVATION_CONFLICT;
+ goto out;
+ }
+
+ if (new_key == 0) {
+ /* unregister */
+ rc = tcmu_pr_info_unregister_reg(pr_info, existing_reg);
+ if (rc < 0) {
+ ret = TCM_OUT_OF_RESOURCES;
+ goto out;
+ }
+ } else {
+ /* update key */
+ existing_reg->key = new_key;
+ }
+
+ ret = TCM_NO_SENSE;
+out:
+ return ret;
+}
+
static int tcmu_configure_device(struct se_device *dev)
{
struct tcmu_dev *udev = TCMU_DEV(dev);
--
2.17.1
