iscsi-target: Convert to use target_put_session + sess_kref

This patch converts iscsi-target session code to use se_sess->sess_kref
counting for iscsi session shutdown.  The following cases include:

*) last iscsit_close_connection() shutdown path to invoke close session
*) iscsit_logout_post_handler_closesession() for explict logout
*) iscsit_free_session() caller for explict shutdown

It also moves iscsit_stop_session() call from lio_tpg_close_session()
into lio_tpg_shutdown_session() TFO callbacks to invoke an explict
shutdown, and also changes iscsi_check_for_session_reinstatement()
login code to use se_sess->sess_kref.

(v2: Make iscsit_handle_time2retain_timeout() use target_put_session)

Cc: Andy Grover <agrover@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index c3ef2f6..d3b54ec 100644 (file)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -4168,7 +4168,7 @@ int iscsit_close_connection(
        if (!atomic_read(&sess->session_reinstatement) &&
             atomic_read(&sess->session_fall_back_to_erl0)) {
                spin_unlock_bh(&sess->conn_lock);
-               iscsit_close_session(sess);
+               target_put_session(sess->se_sess);
 
                return 0;
        } else if (atomic_read(&sess->session_logout)) {
@@ -4289,7 +4289,7 @@ static void iscsit_logout_post_handler_closesession(
        iscsit_dec_conn_usage_count(conn);
        iscsit_stop_session(sess, 1, 1);
        iscsit_dec_session_usage_count(sess);
-       iscsit_close_session(sess);
+       target_put_session(sess->se_sess);
 }
 
 static void iscsit_logout_post_handler_samecid(
@@ -4455,7 +4455,7 @@ int iscsit_free_session(struct iscsi_session *sess)
        } else
                spin_unlock_bh(&sess->conn_lock);
 
-       iscsit_close_session(sess);
+       target_put_session(sess->se_sess);
        return 0;
 }
 

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index dcef63b..1174f74 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1698,8 +1698,8 @@ static int lio_tpg_shutdown_session(struct se_session *se_sess)
        atomic_set(&sess->session_reinstatement, 1);
        spin_unlock(&sess->conn_lock);
 
-       iscsit_inc_session_usage_count(sess);
        iscsit_stop_time2retain_timer(sess);
+       iscsit_stop_session(sess, 1, 1);
 
        return 1;
 }
@@ -1715,8 +1715,6 @@ static void lio_tpg_close_session(struct se_session *se_sess)
         * If the iSCSI Session for the iSCSI Initiator Node exists,
         * forcefully shutdown the iSCSI NEXUS.
         */
-       iscsit_stop_session(sess, 1, 1);
-       iscsit_dec_session_usage_count(sess);
        iscsit_close_session(sess);
 }
 

diff --git a/drivers/target/iscsi/iscsi_target_erl0.c b/drivers/target/iscsi/iscsi_target_erl0.c
index 4784511..1ab0560 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_erl0.c
+++ b/drivers/target/iscsi/iscsi_target_erl0.c
@@ -783,7 +783,7 @@ static void iscsit_handle_time2retain_timeout(unsigned long data)
        }
 
        spin_unlock_bh(&se_tpg->session_lock);
-       iscsit_close_session(sess);
+       target_put_session(sess->se_sess);
 }
 
 extern void iscsit_start_time2retain_handler(struct iscsi_session *sess)

diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 38cb7ce..18cffff 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -180,14 +180,16 @@ int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
        if (sess->session_state == TARG_SESS_STATE_FAILED) {
                spin_unlock_bh(&sess->conn_lock);
                iscsit_dec_session_usage_count(sess);
-               return iscsit_close_session(sess);
+               target_put_session(sess->se_sess);
+               return 0;
        }
        spin_unlock_bh(&sess->conn_lock);
 
        iscsit_stop_session(sess, 1, 1);
        iscsit_dec_session_usage_count(sess);
 
-       return iscsit_close_session(sess);
+       target_put_session(sess->se_sess);
+       return 0;
 }
 
 static void iscsi_login_set_conn_values(