[SCSI] libiscsi: do not block session during logout

There is not need to block the session during logout. Since
we are going to fail the commands that were blocked just fail them
immediately instead.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 84 insertions, 73 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index f79a457099e6..90eae8e0d978 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1349,9 +1349,7 @@ iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
                 struct iscsi_session *session = conn->session;
 
                 spin_lock_bh(&session->lock);
-                list_del(&conn->mtask->running);
-                __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
-                            sizeof(void*));
+                iscsi_free_mgmt_task(conn, mtask);
                 spin_unlock_bh(&session->lock);
         }
         return 0;
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index d43f909a022c..b7a2b9ad3a97 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -37,9 +37,6 @@
 #include <scsi/scsi_transport_iscsi.h>
 #include <scsi/libiscsi.h>
 
-static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
-                         int err);
-
 struct iscsi_session *
 class_to_transport_session(struct iscsi_cls_session *cls_session)
 {
@@ -274,6 +271,53 @@ static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
                 iscsi_complete_command(ctask);
 }
 
+/*
+ * session lock must be held
+ */
+static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+                         int err)
+{
+        struct scsi_cmnd *sc;
+
+        sc = ctask->sc;
+        if (!sc)
+                return;
+
+        if (ctask->state == ISCSI_TASK_PENDING)
+                /*
+                 * cmd never made it to the xmit thread, so we should not count
+                 * the cmd in the sequencing
+                 */
+                conn->session->queued_cmdsn--;
+        else
+                conn->session->tt->cleanup_cmd_task(conn, ctask);
+
+        sc->result = err;
+        scsi_set_resid(sc, scsi_bufflen(sc));
+        if (conn->ctask == ctask)
+                conn->ctask = NULL;
+        /* release ref from queuecommand */
+        __iscsi_put_ctask(ctask);
+}
+
+/**
+ * iscsi_free_mgmt_task - return mgmt task back to pool
+ * @conn: iscsi connection
+ * @mtask: mtask
+ *
+ * Must be called with session lock.
+ */
+void iscsi_free_mgmt_task(struct iscsi_conn *conn,
+                          struct iscsi_mgmt_task *mtask)
+{
+        list_del_init(&mtask->running);
+        if (conn->login_mtask == mtask)
+                return;
+        __kfifo_put(conn->session->mgmtpool.queue,
+                    (void*)&mtask, sizeof(void*));
+}
+EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
+
 /**
  * iscsi_cmd_rsp - SCSI Command Response processing
  * @conn: iscsi connection
@@ -464,10 +508,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
                          */
                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
                                 rc = ISCSI_ERR_CONN_FAILED;
-                        list_del_init(&mtask->running);
-                        if (conn->login_mtask != mtask)
-                                __kfifo_put(session->mgmtpool.queue,
-                                            (void*)&mtask, sizeof(void*));
+                        iscsi_free_mgmt_task(conn, mtask);
                         break;
                 case ISCSI_OP_SCSI_TMFUNC_RSP:
                         if (datalen) {
@@ -476,6 +517,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
                         }
 
                         iscsi_tmf_rsp(conn, hdr);
+                        iscsi_free_mgmt_task(conn, mtask);
                         break;
                 case ISCSI_OP_NOOP_IN:
                         if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
@@ -486,9 +528,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 
                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
                                 rc = ISCSI_ERR_CONN_FAILED;
-                        list_del_init(&mtask->running);
-                        __kfifo_put(session->mgmtpool.queue,
-                                    (void*)&mtask, sizeof(void*));
+                        iscsi_free_mgmt_task(conn, mtask);
                         break;
                 default:
                         rc = ISCSI_ERR_BAD_OPCODE;
@@ -650,14 +690,12 @@ static void iscsi_prep_mtask(struct iscsi_conn *conn,
 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
 {
         struct iscsi_hdr *hdr = conn->mtask->hdr;
-        int rc, was_logout = 0;
+        int rc;
 
+        if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
+                conn->session->state = ISCSI_STATE_LOGGING_OUT;
         spin_unlock_bh(&conn->session->lock);
-        if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
-                conn->session->state = ISCSI_STATE_IN_RECOVERY;
-                iscsi_block_session(session_to_cls(conn->session));
-                was_logout = 1;
-        }
+
         rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
         spin_lock_bh(&conn->session->lock);
         if (rc)
@@ -665,11 +703,6 @@ static int iscsi_xmit_mtask(struct iscsi_conn *conn)
 
         /* done with this in-progress mtask */
         conn->mtask = NULL;
-
-        if (was_logout) {
-                set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
-                return -ENODATA;
-        }
         return 0;
 }
 
@@ -763,6 +796,12 @@ check_mgmt:
         while (!list_empty(&conn->mgmtqueue)) {
                 conn->mtask = list_entry(conn->mgmtqueue.next,
                                          struct iscsi_mgmt_task, running);
+                if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
+                        iscsi_free_mgmt_task(conn, conn->mtask);
+                        conn->mtask = NULL;
+                        continue;
+                }
+
                 iscsi_prep_mtask(conn, conn->mtask);
                 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
                 rc = iscsi_xmit_mtask(conn);
@@ -777,6 +816,10 @@ check_mgmt:
 
                 conn->ctask = list_entry(conn->xmitqueue.next,
                                          struct iscsi_cmd_task, running);
+                if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
+                        fail_command(conn, conn->ctask, DID_NO_CONNECT << 16);
+                        continue;
+                }
                 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
                         fail_command(conn, conn->ctask, DID_ABORT << 16);
                         continue;
@@ -800,6 +843,12 @@ check_mgmt:
                 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
                         break;
 
+                /*
+                 * we always do fastlogout - conn stop code will clean up.
+                 */
+                if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
+                        break;
+
                 conn->ctask = list_entry(conn->requeue.next,
                                          struct iscsi_cmd_task, running);
                 conn->ctask->state = ISCSI_TASK_RUNNING;
@@ -842,6 +891,7 @@ enum {
         FAILURE_SESSION_TERMINATE,
         FAILURE_SESSION_IN_RECOVERY,
         FAILURE_SESSION_RECOVERY_TIMEOUT,
+        FAILURE_SESSION_LOGGING_OUT,
 };
 
 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
@@ -879,12 +929,19 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
                         goto reject;
                 }
 
-                if (session->state == ISCSI_STATE_RECOVERY_FAILED)
+                switch (session->state) {
+                case ISCSI_STATE_RECOVERY_FAILED:
                         reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
-                else if (session->state == ISCSI_STATE_TERMINATE)
+                        break;
+                case ISCSI_STATE_TERMINATE:
                         reason = FAILURE_SESSION_TERMINATE;
-                else
+                        break;
+                case ISCSI_STATE_LOGGING_OUT:
+                        reason = FAILURE_SESSION_LOGGING_OUT;
+                        break;
+                default:
                         reason = FAILURE_SESSION_FREED;
+                }
                 goto fault;
         }
 
@@ -1120,45 +1177,10 @@ static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
         if (age != session->age ||
             session->state != ISCSI_STATE_LOGGED_IN)
                 return -ENOTCONN;
-
-        if (!list_empty(&mtask->running)) {
-                list_del_init(&mtask->running);
-                __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
-                            sizeof(void*));
-        }
         return 0;
 }
 
 /*
- * session lock must be held
- */
-static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
-                         int err)
-{
-        struct scsi_cmnd *sc;
-
-        sc = ctask->sc;
-        if (!sc)
-                return;
-
-        if (ctask->state == ISCSI_TASK_PENDING)
-                /*
-                 * cmd never made it to the xmit thread, so we should not count
-                 * the cmd in the sequencing
-                 */
-                conn->session->queued_cmdsn--;
-        else
-                conn->session->tt->cleanup_cmd_task(conn, ctask);
-
-        sc->result = err;
-        scsi_set_resid(sc, scsi_bufflen(sc));
-        if (conn->ctask == ctask)
-                conn->ctask = NULL;
-        /* release ref from queuecommand */
-        __iscsi_put_ctask(ctask);
-}
-
-/*
  * Fail commands. session lock held and recv side suspended and xmit
  * thread flushed
  */
@@ -1837,22 +1859,13 @@ flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
         /* handle pending */
         list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
                 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
-                list_del_init(&mtask->running);
-                if (mtask == conn->login_mtask)
-                        continue;
-                __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
-                            sizeof(void*));
+                iscsi_free_mgmt_task(conn, mtask);
         }
 
         /* handle running */
         list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
                 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
-                list_del_init(&mtask->running);
-
-                if (mtask == conn->login_mtask)
-                        continue;
-                __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
-                           sizeof(void*));
+                iscsi_free_mgmt_task(conn, mtask);
         }
 
         conn->mtask = NULL;