[SCSI] libiscsi: add task aborted state

If a task did not complete normally due to a TMF, libiscsi will
now complete the task with the state ISCSI_TASK_ABRT_TMF. Drivers
like bnx2i that need to free resources if a command did not complete normally
can then check the task state. If a driver does not need to send
a special command if we have dropped the session then they can check
for ISCSI_TASK_ABRT_SESS_RECOV.

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

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index ffbe0c7..0ba6ec8 100644 (file)
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -257,11 +257,8 @@ static void iscsi_iser_cleanup_task(struct iscsi_task *task)
 {
        struct iscsi_iser_task *iser_task = task->dd_data;
 
-       /*
-        * mgmt tasks do not need special cleanup and we do not
-        * allocate anything in the init task callout
-        */
-       if (!task->sc || task->state == ISCSI_TASK_PENDING)
+       /* mgmt tasks do not need special cleanup */
+       if (!task->sc)
                return;
 
        if (iser_task->status == ISER_TASK_STATUS_STARTED) {

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index dafa054..b00be6c 100644 (file)
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -443,18 +443,20 @@ EXPORT_SYMBOL_GPL(iscsi_put_task);
 /**
  * iscsi_complete_task - finish a task
  * @task: iscsi cmd task
+ * @state: state to complete task with
  *
  * Must be called with session lock.
  */
-static void iscsi_complete_task(struct iscsi_task *task)
+static void iscsi_complete_task(struct iscsi_task *task, int state)
 {
        struct iscsi_conn *conn = task->conn;
 
-       if (task->state == ISCSI_TASK_COMPLETED)
+       if (task->state == ISCSI_TASK_COMPLETED ||
+           task->state == ISCSI_TASK_ABRT_TMF ||
+           task->state == ISCSI_TASK_ABRT_SESS_RECOV)
                return;
        WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
-
-       task->state = ISCSI_TASK_COMPLETED;
+       task->state = state;
 
        if (!list_empty(&task->running))
                list_del_init(&task->running);
@@ -478,6 +480,7 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
 {
        struct iscsi_conn *conn = task->conn;
        struct scsi_cmnd *sc;
+       int state;
 
        /*
         * if a command completes and we get a successful tmf response
@@ -488,14 +491,20 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
        if (!sc)
                return;
 
-       if (task->state == ISCSI_TASK_PENDING)
+       if (task->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--;
+               /* it was never sent so just complete like normal */
+               state = ISCSI_TASK_COMPLETED;
+       } else if (err == DID_TRANSPORT_DISRUPTED)
+               state = ISCSI_TASK_ABRT_SESS_RECOV;
+       else
+               state = ISCSI_TASK_ABRT_TMF;
 
-       sc->result = err;
+       sc->result = err << 16;
        if (!scsi_bidi_cmnd(sc))
                scsi_set_resid(sc, scsi_bufflen(sc));
        else {
@@ -503,7 +512,7 @@ static void fail_scsi_task(struct iscsi_task *task, int err)
                scsi_in(sc)->resid = scsi_in(sc)->length;
        }
 
-       iscsi_complete_task(task);
+       iscsi_complete_task(task, state);
 }
 
 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
@@ -731,7 +740,7 @@ out:
        ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
                          sc, sc->result, task->itt);
        conn->scsirsp_pdus_cnt++;
-       iscsi_complete_task(task);
+       iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
 }
 
 /**
@@ -769,7 +778,7 @@ iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
                          "[sc %p res %d itt 0x%x]\n",
                          sc, sc->result, task->itt);
        conn->scsirsp_pdus_cnt++;
-       iscsi_complete_task(task);
+       iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
 }
 
 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
@@ -990,7 +999,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
                }
 
                iscsi_tmf_rsp(conn, hdr);
-               iscsi_complete_task(task);
+               iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
                break;
        case ISCSI_OP_NOOP_IN:
                iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
@@ -1008,7 +1017,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
                        goto recv_pdu;
 
                mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
-               iscsi_complete_task(task);
+               iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
                break;
        default:
                rc = ISCSI_ERR_BAD_OPCODE;
@@ -1020,7 +1029,7 @@ out:
 recv_pdu:
        if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
                rc = ISCSI_ERR_CONN_FAILED;
-       iscsi_complete_task(task);
+       iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
        return rc;
 }
 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
@@ -1262,7 +1271,7 @@ check_mgmt:
                                         struct iscsi_task, running);
                list_del_init(&conn->task->running);
                if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
-                       fail_scsi_task(conn->task, DID_IMM_RETRY << 16);
+                       fail_scsi_task(conn->task, DID_IMM_RETRY);
                        continue;
                }
                rc = iscsi_prep_scsi_cmd_pdu(conn->task);
@@ -1273,7 +1282,7 @@ check_mgmt:
                                conn->task = NULL;
                                goto again;
                        } else
-                               fail_scsi_task(conn->task, DID_ABORT << 16);
+                               fail_scsi_task(conn->task, DID_ABORT);
                        continue;
                }
                rc = iscsi_xmit_task(conn);
@@ -1469,7 +1478,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 
 prepd_reject:
        sc->scsi_done = NULL;
-       iscsi_complete_task(task);
+       iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
 reject:
        spin_unlock(&session->lock);
        ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
@@ -1479,7 +1488,7 @@ reject:
 
 prepd_fault:
        sc->scsi_done = NULL;
-       iscsi_complete_task(task);
+       iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
 fault:
        spin_unlock(&session->lock);
        ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
@@ -1665,7 +1674,7 @@ static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
                ISCSI_DBG_SESSION(conn->session,
                                  "failing sc %p itt 0x%x state %d\n",
                                  task->sc, task->itt, task->state);
-               fail_scsi_task(task, error << 16);
+               fail_scsi_task(task, error);
        }
 }
 
@@ -1868,7 +1877,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
        }
 
        if (task->state == ISCSI_TASK_PENDING) {
-               fail_scsi_task(task, DID_ABORT << 16);
+               fail_scsi_task(task, DID_ABORT);
                goto success;
        }
 
@@ -1899,7 +1908,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
                 * then sent more data for the cmd.
                 */
                spin_lock(&session->lock);
-               fail_scsi_task(task, DID_ABORT << 16);
+               fail_scsi_task(task, DID_ABORT);
                conn->tmf_state = TMF_INITIAL;
                spin_unlock(&session->lock);
                iscsi_start_tx(conn);
@@ -2572,7 +2581,7 @@ static void
 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
 {
        struct iscsi_task *task;
-       int i;
+       int i, state;
 
        for (i = 0; i < conn->session->cmds_max; i++) {
                task = conn->session->cmds[i];
@@ -2585,7 +2594,11 @@ fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
                ISCSI_DBG_SESSION(conn->session,
                                  "failing mgmt itt 0x%x state %d\n",
                                  task->itt, task->state);
-               iscsi_complete_task(task);
+               state = ISCSI_TASK_ABRT_SESS_RECOV;
+               if (task->state == ISCSI_TASK_PENDING)
+                       state = ISCSI_TASK_COMPLETED;
+               iscsi_complete_task(task, state);
+
        }
 }
 
@@ -2642,10 +2655,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
         * flush queues.
         */
        spin_lock_bh(&session->lock);
-       if (flag == STOP_CONN_RECOVER)
-               fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
-       else
-               fail_scsi_tasks(conn, -1, DID_ERROR);
+       fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
        fail_mgmt_tasks(session, conn);
        spin_unlock_bh(&session->lock);
        mutex_unlock(&session->eh_mutex);

diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index b84a1d8..2bc0709 100644 (file)
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -440,8 +440,8 @@ void iscsi_tcp_cleanup_task(struct iscsi_task *task)
        struct iscsi_tcp_task *tcp_task = task->dd_data;
        struct iscsi_r2t_info *r2t;
 
-       /* nothing to do for mgmt or pending tasks */
-       if (!task->sc || task->state == ISCSI_TASK_PENDING)
+       /* nothing to do for mgmt */
+       if (!task->sc)
                return;
 
        /* flush task's r2t queues */

diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index facae71..196525c 100644 (file)
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -86,6 +86,8 @@ enum {
        ISCSI_TASK_COMPLETED,
        ISCSI_TASK_PENDING,
        ISCSI_TASK_RUNNING,
+       ISCSI_TASK_ABRT_TMF,            /* aborted due to TMF */
+       ISCSI_TASK_ABRT_SESS_RECOV,     /* aborted due to session recovery */
 };
 
 struct iscsi_r2t_info {