From 67a611149b2ac5f4af1e36bfffbfe3198cd3712c Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 30 May 2006 00:37:20 -0500 Subject: [SCSI] iscsi: don't switch states when just cleaning up If recovery failed or we are in recovery only overwrite the state if we are going to terminate the session or if we logged back in. STOP_CONN_SUSPEND and conn_cnt are not used. We only support a single connection session ATM, so cleanup that code while we are working around it. Signed-off-by: Mike Christie Signed-off-by: James Bottomley diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index c66faee..2abda80 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -1955,30 +1955,28 @@ iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, if (err) return err; - if (conn->stop_stage != STOP_CONN_SUSPEND) { - /* bind iSCSI connection and socket */ - tcp_conn->sock = sock; + /* bind iSCSI connection and socket */ + tcp_conn->sock = sock; - /* setup Socket parameters */ - sk = sock->sk; - sk->sk_reuse = 1; - sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ - sk->sk_allocation = GFP_ATOMIC; + /* setup Socket parameters */ + sk = sock->sk; + sk->sk_reuse = 1; + sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ + sk->sk_allocation = GFP_ATOMIC; - /* FIXME: disable Nagle's algorithm */ + /* FIXME: disable Nagle's algorithm */ - /* - * Intercept TCP callbacks for sendfile like receive - * processing. - */ - conn->recv_lock = &sk->sk_callback_lock; - iscsi_conn_set_callbacks(conn); - tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; - /* - * set receive state machine into initial state - */ - tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; - } + /* + * Intercept TCP callbacks for sendfile like receive + * processing. + */ + conn->recv_lock = &sk->sk_callback_lock; + iscsi_conn_set_callbacks(conn); + tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; + /* + * set receive state machine into initial state + */ + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; return 0; } diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index d810aca..9630025 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -492,7 +492,7 @@ void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) return; } - if (session->conn_cnt == 1 || session->leadconn == conn) + if (conn->stop_stage == 0) session->state = ISCSI_STATE_FAILED; spin_unlock_irqrestore(&session->lock, flags); set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); @@ -652,7 +652,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) */ if (session->state == ISCSI_STATE_IN_RECOVERY) { reason = FAILURE_SESSION_IN_RECOVERY; - goto fault; + goto reject; } if (session->state == ISCSI_STATE_RECOVERY_FAILED) @@ -1411,8 +1411,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) struct iscsi_session *session = conn->session; unsigned long flags; - mutex_lock(&conn->xmitmutex); set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + mutex_lock(&conn->xmitmutex); if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE) { if (session->tt->suspend_conn_recv) session->tt->suspend_conn_recv(conn); @@ -1498,7 +1498,6 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) * unblock eh_abort() if it is blocked. re-try all * commands after successful recovery */ - session->conn_cnt++; conn->stop_stage = 0; conn->tmabort_state = TMABORT_INITIAL; session->age++; @@ -1508,13 +1507,7 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) wake_up(&conn->ehwait); return 0; case STOP_CONN_TERM: - session->conn_cnt++; - conn->stop_stage = 0; - break; - case STOP_CONN_SUSPEND: conn->stop_stage = 0; - clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); - clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); break; default: break; @@ -1589,28 +1582,24 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, /* * When this is called for the in_login state, we only want to clean - * up the login task and connection. + * up the login task and connection. We do not need to block and set + * the recovery state again */ - if (conn->stop_stage != STOP_CONN_RECOVER) - session->conn_cnt--; + if (flag == STOP_CONN_TERM) + session->state = ISCSI_STATE_TERMINATE; + else if (conn->stop_stage != STOP_CONN_RECOVER) + session->state = ISCSI_STATE_IN_RECOVERY; old_stop_stage = conn->stop_stage; conn->stop_stage = flag; + conn->c_stage = ISCSI_CONN_STOPPED; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); spin_unlock_bh(&session->lock); if (session->tt->suspend_conn_recv) session->tt->suspend_conn_recv(conn); mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); - - if (session->conn_cnt == 0 || session->leadconn == conn) - session->state = ISCSI_STATE_IN_RECOVERY; - - spin_unlock_bh(&session->lock); - /* * for connection level recovery we should not calculate * header digest. conn->hdr_size used for optimization @@ -1620,13 +1609,11 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, if (flag == STOP_CONN_RECOVER) { conn->hdrdgst_en = 0; conn->datadgst_en = 0; - /* - * if this is called from the eh and and from userspace - * then we only need to block once. - */ if (session->state == ISCSI_STATE_IN_RECOVERY && - old_stop_stage != STOP_CONN_RECOVER) + old_stop_stage != STOP_CONN_RECOVER) { + debug_scsi("blocking session\n"); iscsi_block_session(session_to_cls(session)); + } } session->tt->terminate_conn(conn); @@ -1651,20 +1638,6 @@ void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) case STOP_CONN_TERM: iscsi_start_session_recovery(session, conn, flag); break; - case STOP_CONN_SUSPEND: - if (session->tt->suspend_conn_recv) - session->tt->suspend_conn_recv(conn); - - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - - conn->stop_stage = flag; - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); - - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - break; default: printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); } diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h index 17b28f0..cbf7e58 100644 --- a/include/scsi/libiscsi.h +++ b/include/scsi/libiscsi.h @@ -211,7 +211,6 @@ struct iscsi_session { * - r2tpool */ int state; /* session state */ struct list_head item; - int conn_cnt; int age; /* counts session re-opens */ struct list_head connections; /* list of connections */ -- cgit v0.10.2