diff options
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 659 | ||||
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 3 | ||||
| -rw-r--r-- | drivers/scsi/scsi_transport_iscsi.c | 152 | ||||
| -rw-r--r-- | include/scsi/iscsi_if.h | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_transport_iscsi.h | 19 |
5 files changed, 561 insertions, 274 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 6e510f3..aca3e23 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -82,6 +82,9 @@ module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); /* global data */ static kmem_cache_t *taskcache; +#define session_to_cls(_sess) \ + hostdata_session(_sess->host->hostdata) + static inline void iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size) { @@ -230,17 +233,19 @@ iscsi_hdr_extract(struct iscsi_conn *conn) return 0; } -static inline void -iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +/* + * must be called with session lock + */ +static void +__iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct scsi_cmnd *sc = ctask->sc; struct iscsi_session *session = conn->session; + struct scsi_cmnd *sc; - spin_lock(&session->lock); - if (unlikely(!sc)) { - spin_unlock(&session->lock); + sc = ctask->sc; + if (unlikely(!sc)) return; - } + if (sc->sc_data_direction == DMA_TO_DEVICE) { struct iscsi_data_task *dtask, *n; /* WRITE: cleanup Data-Out's if any */ @@ -252,7 +257,20 @@ iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) ctask->xmstate = XMSTATE_IDLE; ctask->r2t = NULL; ctask->sc = NULL; + list_del(&ctask->running); + __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); + + sc->scsi_done(sc); +} + +static void +iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +{ + struct iscsi_session *session = conn->session; + + spin_lock(&session->lock); + __iscsi_ctask_cleanup(conn, ctask); spin_unlock(&session->lock); } @@ -311,7 +329,6 @@ out: (long)sc, sc->result, ctask->itt); conn->scsirsp_pdus_cnt++; iscsi_ctask_cleanup(conn, ctask); - sc->scsi_done(sc); return rc; } @@ -395,6 +412,7 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; memset(hdr, 0, sizeof(struct iscsi_data)); hdr->ttt = r2t->ttt; @@ -710,8 +728,6 @@ iscsi_hdr_recv(struct iscsi_conn *conn) conn->tmfrsp_pdus_cnt++; spin_lock(&session->lock); if (conn->tmabort_state == TMABORT_INITIAL) { - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); conn->tmabort_state = ((struct iscsi_tm_rsp *)hdr)-> response == ISCSI_TMF_RSP_COMPLETE ? @@ -986,7 +1002,6 @@ done: (long)sc, sc->result, ctask->itt); conn->scsirsp_pdus_cnt++; iscsi_ctask_cleanup(conn, ctask); - sc->scsi_done(sc); } return rc; @@ -1460,6 +1475,7 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; memset(hdr, 0, sizeof(struct iscsi_data)); hdr->ttt = r2t->ttt; @@ -1506,6 +1522,7 @@ iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); + INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; memset(hdr, 0, sizeof(struct iscsi_data)); hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); @@ -1550,6 +1567,7 @@ iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, BUG_ON(__kfifo_len(ctask->r2tqueue)); + INIT_LIST_HEAD(&ctask->running); ctask->sc = sc; ctask->conn = conn; ctask->hdr.opcode = ISCSI_OP_SCSI_CMD; @@ -1680,7 +1698,7 @@ iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) if (mtask->data_count) mtask->xmstate |= XMSTATE_IMM_DATA; if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && - conn->stop_stage != STOP_CONN_RECOVER && + conn->stop_stage != STOP_CONN_RECOVER && conn->hdrdgst_en) iscsi_hdr_digest(conn, &mtask->headbuf, (u8*)mtask->hdrext); @@ -2226,6 +2244,7 @@ iscsi_data_xmit(struct iscsi_conn *conn) /* process command queue */ while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, sizeof(void*))) { + list_add_tail(&conn->ctask->running, &conn->run_list); if (iscsi_ctask_xmit(conn, conn->ctask)) goto again; } @@ -2277,11 +2296,14 @@ iscsi_xmitworker(void *data) mutex_unlock(&conn->xmitmutex); } -#define FAILURE_BAD_HOST 1 -#define FAILURE_SESSION_FAILED 2 -#define FAILURE_SESSION_FREED 3 -#define FAILURE_WINDOW_CLOSED 4 -#define FAILURE_SESSION_TERMINATE 5 +enum { + FAILURE_BAD_HOST = 1, + FAILURE_SESSION_FAILED, + FAILURE_SESSION_FREED, + FAILURE_WINDOW_CLOSED, + FAILURE_SESSION_TERMINATE, + FAILURE_SESSION_RECOVERY_TIMEOUT, +}; static int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) @@ -2297,12 +2319,14 @@ iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) host = sc->device->host; session = iscsi_hostdata(host->hostdata); - BUG_ON(host != session->host); spin_lock(&session->lock); if (session->state != ISCSI_STATE_LOGGED_IN) { - if (session->state == ISCSI_STATE_FAILED) { + if (session->recovery_failed) { + reason = FAILURE_SESSION_RECOVERY_TIMEOUT; + goto fault; + } else if (session->state == ISCSI_STATE_FAILED) { reason = FAILURE_SESSION_FAILED; goto reject; } else if (session->state == ISCSI_STATE_TERMINATE) { @@ -2350,11 +2374,6 @@ fault: spin_unlock(&session->lock); printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason); - sc->sense_buffer[0] = 0x70; - sc->sense_buffer[2] = NOT_READY; - sc->sense_buffer[7] = 0x6; - sc->sense_buffer[12] = 0x08; - sc->sense_buffer[13] = 0x00; sc->result = (DID_NO_CONNECT << 16); sc->resid = sc->request_bufflen; sc->scsi_done(sc); @@ -2445,6 +2464,7 @@ iscsi_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) conn->id = conn_idx; conn->exp_statsn = 0; conn->tmabort_state = TMABORT_INITIAL; + INIT_LIST_HEAD(&conn->run_list); /* initial operational parameters */ conn->hdr_size = sizeof(struct iscsi_hdr); @@ -2701,6 +2721,22 @@ iscsi_conn_bind(struct iscsi_cls_session *cls_session, return 0; } +static void +iscsi_session_recovery_timedout(struct iscsi_cls_session *csession) +{ + struct Scsi_Host *shost = iscsi_session_to_shost(csession); + struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + struct iscsi_conn *conn = session->leadconn; + + spin_lock_bh(&session->lock); + if (session->state != ISCSI_STATE_LOGGED_IN) { + session->recovery_failed = 1; + if (conn) + wake_up(&conn->ehwait); + } + spin_unlock_bh(&session->lock); +} + static int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) { @@ -2716,7 +2752,6 @@ iscsi_conn_start(struct iscsi_cls_conn *cls_conn) } sk = conn->sock->sk; - write_lock_bh(&sk->sk_callback_lock); spin_lock_bh(&session->lock); conn->c_stage = ISCSI_CONN_STARTED; @@ -2732,8 +2767,13 @@ iscsi_conn_start(struct iscsi_cls_conn *cls_conn) conn->stop_stage = 0; conn->tmabort_state = TMABORT_INITIAL; session->age++; + session->recovery_failed = 0; + spin_unlock_bh(&session->lock); + write_unlock_bh(&sk->sk_callback_lock); + + iscsi_unblock_session(session_to_cls(session)); wake_up(&conn->ehwait); - break; + return 0; case STOP_CONN_TERM: session->conn_cnt++; conn->stop_stage = 0; @@ -2752,105 +2792,199 @@ iscsi_conn_start(struct iscsi_cls_conn *cls_conn) return 0; } -static void -iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) +static int +iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) { - struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_conn *conn = ctask->conn; struct iscsi_session *session = conn->session; + struct iscsi_mgmt_task *mtask; + + if (!ctask->mtask) + return -EINVAL; + + while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*))) { + if (mtask == ctask->mtask) + break; + __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); + } + + __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, + sizeof(void*)); + ctask->mtask = NULL; + return 0; +} + +static void +fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, int err) +{ + struct iscsi_r2t_info *r2t; + struct scsi_cmnd *sc; + + /* flush ctask's r2t queues */ + while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) + __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + + iscsi_ctask_mtask_cleanup(ctask); + + sc = ctask->sc; + if (!sc) + return; + + sc->result = err; + sc->resid = sc->request_bufflen; + + __iscsi_ctask_cleanup(conn, ctask); +} + +/* Fail commands. Mutex and session lock held */ +static void +fail_all_commands(struct iscsi_session *session, struct iscsi_conn *conn) +{ + struct iscsi_cmd_task *ctask, *tmp; + + /* flush pending */ + while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) { + debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, + ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); + } + + /* fail running */ + list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { + debug_scsi("failing in progress sc %p itt 0x%x\n", + ctask->sc, ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); + } + + conn->ctask = NULL; +} + +static void +flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) +{ + struct iscsi_mgmt_task *mtask; + + /* TODO: handle running pdus */ + while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || + __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { + if (mtask == conn->login_mtask) + continue; + __kfifo_put(session->mgmtpool.queue, (void*)&mtask, + sizeof(void*)); + } + + if (conn->mtask && conn->mtask != conn->login_mtask) + __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, + sizeof(void*)); + conn->mtask = NULL; +} + +static void +iscsi_suspend_conn_rx(struct iscsi_conn *conn) +{ struct sock *sk; - unsigned long flags; BUG_ON(!conn->sock); sk = conn->sock->sk; write_lock_bh(&sk->sk_callback_lock); set_bit(SUSPEND_BIT, &conn->suspend_rx); write_unlock_bh(&sk->sk_callback_lock); +} - mutex_lock(&conn->xmitmutex); - - spin_lock_irqsave(session->host->host_lock, flags); - spin_lock(&session->lock); +static void +iscsi_start_session_recovery(struct iscsi_session *session, + struct iscsi_conn *conn, int flag) +{ + spin_lock_bh(&session->lock); + if (conn->stop_stage == STOP_CONN_RECOVER || + conn->stop_stage == STOP_CONN_TERM) { + spin_unlock_bh(&session->lock); + return; + } conn->stop_stage = flag; + spin_unlock_bh(&session->lock); + + iscsi_suspend_conn_rx(conn); + + mutex_lock(&conn->xmitmutex); + spin_lock_bh(&session->lock); conn->c_stage = ISCSI_CONN_STOPPED; set_bit(SUSPEND_BIT, &conn->suspend_tx); - if (flag != STOP_CONN_SUSPEND) - session->conn_cnt--; - + session->conn_cnt--; if (session->conn_cnt == 0 || session->leadconn == conn) session->state = ISCSI_STATE_FAILED; - spin_unlock(&session->lock); - spin_unlock_irqrestore(session->host->host_lock, flags); - - if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) { - struct iscsi_cmd_task *ctask; - struct iscsi_mgmt_task *mtask; + spin_unlock_bh(&session->lock); - /* - * Socket must go now. - */ - sock_hold(conn->sock->sk); - iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); + /* + * Socket must go now. + */ + sock_hold(conn->sock->sk); + iscsi_conn_restore_callbacks(conn); + sock_put(conn->sock->sk); - /* - * flush xmit queues. - */ - spin_lock_bh(&session->lock); - while (__kfifo_get(conn->writequeue, (void*)&ctask, - sizeof(void*)) || - __kfifo_get(conn->xmitqueue, (void*)&ctask, - sizeof(void*))) { - struct iscsi_r2t_info *r2t; - - /* - * flush ctask's r2t queues - */ - while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, - sizeof(void*))) - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, - sizeof(void*)); + /* + * flush queues. + */ + spin_lock_bh(&session->lock); + fail_all_commands(session, conn); + flush_control_queues(session, conn); + spin_unlock_bh(&session->lock); - spin_unlock_bh(&session->lock); - local_bh_disable(); - iscsi_ctask_cleanup(conn, ctask); - local_bh_enable(); - spin_lock_bh(&session->lock); - } - conn->ctask = NULL; - while (__kfifo_get(conn->immqueue, (void*)&mtask, - sizeof(void*)) || - __kfifo_get(conn->mgmtqueue, (void*)&mtask, - sizeof(void*))) { - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - } - conn->mtask = NULL; - spin_unlock_bh(&session->lock); + /* + * release socket only after we stopped data_xmit() + * activity and flushed all outstandings + */ + sock_release(conn->sock); + conn->sock = NULL; - /* - * release socket only after we stopped data_xmit() - * activity and flushed all outstandings - */ - sock_release(conn->sock); - conn->sock = NULL; + /* + * for connection level recovery we should not calculate + * header digest. conn->hdr_size used for optimization + * in hdr_extract() and will be re-negotiated at + * set_param() time. + */ + if (flag == STOP_CONN_RECOVER) { + conn->hdr_size = sizeof(struct iscsi_hdr); + conn->hdrdgst_en = 0; + conn->datadgst_en = 0; - /* - * for connection level recovery we should not calculate - * header digest. conn->hdr_size used for optimization - * in hdr_extract() and will be re-negotiated at - * set_param() time. - */ - if (flag == STOP_CONN_RECOVER) { - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->hdrdgst_en = 0; - conn->datadgst_en = 0; - } + if (session->state == ISCSI_STATE_FAILED) + iscsi_block_session(session_to_cls(session)); } mutex_unlock(&conn->xmitmutex); } +static void +iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + + switch (flag) { + case STOP_CONN_RECOVER: + case STOP_CONN_TERM: + iscsi_start_session_recovery(session, conn, flag); + return; + case STOP_CONN_SUSPEND: + iscsi_suspend_conn_rx(conn); + + mutex_lock(&conn->xmitmutex); + spin_lock_bh(&session->lock); + + conn->stop_stage = flag; + conn->c_stage = ISCSI_CONN_STOPPED; + set_bit(SUSPEND_BIT, &conn->suspend_tx); + + spin_unlock_bh(&session->lock); + mutex_unlock(&conn->xmitmutex); + break; + default: + printk(KERN_ERR "invalid stop flag %d\n", flag); + } +} + static int iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, char *data, uint32_t data_size) @@ -2940,23 +3074,54 @@ iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, static int iscsi_eh_host_reset(struct scsi_cmnd *sc) { - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; + struct Scsi_Host *host = sc->device->host; + struct iscsi_session *session = iscsi_hostdata(host->hostdata); + struct iscsi_conn *conn = session->leadconn; + int fail_session = 0; spin_lock_bh(&session->lock); if (session->state == ISCSI_STATE_TERMINATE) { +failed: debug_scsi("failing host reset: session terminated " "[CID %d age %d]", conn->id, session->age); spin_unlock_bh(&session->lock); return FAILED; } + + if (sc->SCp.phase == session->age) { + debug_scsi("failing connection CID %d due to SCSI host reset", + conn->id); + fail_session = 1; + } spin_unlock_bh(&session->lock); - debug_scsi("failing connection CID %d due to SCSI host reset " - "[itt 0x%x age %d]", conn->id, ctask->itt, - session->age); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + /* + * we drop the lock here but the leadconn cannot be destoyed while + * we are in the scsi eh + */ + if (fail_session) { + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + /* + * if userspace cannot respond then we must kick this off + * here for it + */ + iscsi_start_session_recovery(session, conn, STOP_CONN_RECOVER); + } + + debug_scsi("iscsi_eh_host_reset wait for relogin\n"); + wait_event_interruptible(conn->ehwait, + session->state == ISCSI_STATE_TERMINATE || + session->state == ISCSI_STATE_LOGGED_IN || + session->recovery_failed); + if (signal_pending(current)) + flush_signals(current); + + spin_lock_bh(&session->lock); + if (session->state == ISCSI_STATE_LOGGED_IN) + printk(KERN_INFO "host reset succeeded\n"); + else + goto failed; + spin_unlock_bh(&session->lock); return SUCCESS; } @@ -2970,8 +3135,6 @@ iscsi_tmabort_timedout(unsigned long data) spin_lock(&session->lock); if (conn->tmabort_state == TMABORT_INITIAL) { - __kfifo_put(session->mgmtpool.queue, - (void*)&ctask->mtask, sizeof(void*)); conn->tmabort_state = TMABORT_TIMEDOUT; debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n", (long)ctask->sc, ctask->itt); @@ -2981,186 +3144,163 @@ iscsi_tmabort_timedout(unsigned long data) spin_unlock(&session->lock); } +/* must be called with the mutex lock */ static int -iscsi_eh_abort(struct scsi_cmnd *sc) +iscsi_exec_abort_task(struct scsi_cmnd *sc, struct iscsi_cmd_task *ctask) { - int rc; - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; struct iscsi_conn *conn = ctask->conn; struct iscsi_session *session = conn->session; - - conn->eh_abort_cnt++; - debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + struct iscsi_tm *hdr = &conn->tmhdr; + int rc; /* - * two cases for ERL=0 here: - * - * 1) connection-level failure; - * 2) recovery due protocol error; + * ctask timed out but session is OK requests must be serialized. */ - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - if (session->state != ISCSI_STATE_LOGGED_IN) { - if (session->state == ISCSI_STATE_TERMINATE) { - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - goto failed; - } - spin_unlock_bh(&session->lock); - } else { - struct iscsi_tm *hdr = &conn->tmhdr; + memset(hdr, 0, sizeof(struct iscsi_tm)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); + hdr->rtt = ctask->hdr.itt; + hdr->refcmdsn = ctask->hdr.cmdsn; - /* - * Still LOGGED_IN... - */ + rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, + NULL, 0); + if (rc) { + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); + return rc; + } - if (!ctask->sc || sc->SCp.phase != session->age) { - /* - * 1) ctask completed before time out. But session - * is still ok => Happy Retry. - * 2) session was re-open during time out of ctask. - */ - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - goto success; - } - conn->tmabort_state = TMABORT_INITIAL; - spin_unlock_bh(&session->lock); + debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); - /* - * ctask timed out but session is OK - * ERL=0 requires task mgmt abort to be issued on each - * failed command. requests must be serialized. - */ - memset(hdr, 0, sizeof(struct iscsi_tm)); - hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; - hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; - hdr->flags |= ISCSI_FLAG_CMD_FINAL; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->rtt = ctask->hdr.itt; - hdr->refcmdsn = ctask->hdr.cmdsn; - - rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, - NULL, 0); - if (rc) { - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - debug_scsi("abort sent failure [itt 0x%x]", ctask->itt); - } else { - struct iscsi_r2t_info *r2t; - - /* - * TMF abort vs. TMF response race logic - */ - spin_lock_bh(&session->lock); - ctask->mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[(hdr->itt & ITT_MASK) - - ISCSI_MGMT_ITT_OFFSET]; - /* - * have to flush r2tqueue to avoid r2t leaks - */ - while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, - sizeof(void*))) { - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, - sizeof(void*)); - } - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmfcmd_pdus_cnt++; - conn->tmabort_timer.expires = 3*HZ + jiffies; - conn->tmabort_timer.function = - iscsi_tmabort_timedout; - conn->tmabort_timer.data = (unsigned long)ctask; - add_timer(&conn->tmabort_timer); - debug_scsi("abort sent [itt 0x%x]", ctask->itt); - } else { - if (!ctask->sc || - conn->tmabort_state == TMABORT_SUCCESS) { - conn->tmabort_state = TMABORT_INITIAL; - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - goto success; - } - conn->tmabort_state = TMABORT_INITIAL; - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - } - spin_unlock_bh(&session->lock); - } + spin_lock_bh(&session->lock); + ctask->mtask = (struct iscsi_mgmt_task *) + session->mgmt_cmds[(hdr->itt & ITT_MASK) - + ISCSI_MGMT_ITT_OFFSET]; + + if (conn->tmabort_state == TMABORT_INITIAL) { + conn->tmfcmd_pdus_cnt++; + conn->tmabort_timer.expires = 10*HZ + jiffies; + conn->tmabort_timer.function = iscsi_tmabort_timedout; + conn->tmabort_timer.data = (unsigned long)ctask; + add_timer(&conn->tmabort_timer); + debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); } + spin_unlock_bh(&session->lock); mutex_unlock(&conn->xmitmutex); - /* * block eh thread until: * - * 1) abort response; - * 2) abort timeout; - * 3) session re-opened; - * 4) session terminated; + * 1) abort response + * 2) abort timeout + * 3) session is terminated or restarted or userspace has + * given up on recovery */ - for (;;) { - int p_state = session->state; - - rc = wait_event_interruptible(conn->ehwait, - (p_state == ISCSI_STATE_LOGGED_IN ? - (session->state == ISCSI_STATE_TERMINATE || - conn->tmabort_state != TMABORT_INITIAL) : - (session->state == ISCSI_STATE_TERMINATE || - session->state == ISCSI_STATE_LOGGED_IN))); - if (rc) { - /* shutdown.. */ - session->state = ISCSI_STATE_TERMINATE; - goto failed; - } + wait_event_interruptible(conn->ehwait, + sc->SCp.phase != session->age || + session->state != ISCSI_STATE_LOGGED_IN || + conn->tmabort_state != TMABORT_INITIAL || + session->recovery_failed); + if (signal_pending(current)) + flush_signals(current); + del_timer_sync(&conn->tmabort_timer); - if (signal_pending(current)) - flush_signals(current); + mutex_lock(&conn->xmitmutex); + return 0; +} - if (session->state == ISCSI_STATE_TERMINATE) - goto failed; +static int +iscsi_eh_abort(struct scsi_cmnd *sc) +{ + struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; + struct iscsi_cmd_task *tmp_ctask; + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; + int rc; - spin_lock_bh(&session->lock); - if (sc->SCp.phase == session->age && - (conn->tmabort_state == TMABORT_TIMEDOUT || - conn->tmabort_state == TMABORT_FAILED)) { - conn->tmabort_state = TMABORT_INITIAL; - if (!ctask->sc) { - /* - * ctask completed before tmf abort response or - * time out. - * But session is still ok => Happy Retry. - */ - spin_unlock_bh(&session->lock); - break; - } - spin_unlock_bh(&session->lock); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - continue; + conn->eh_abort_cnt++; + debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); + + mutex_lock(&conn->xmitmutex); + spin_lock_bh(&session->lock); + + /* + * If we are not logged in or we have started a new session + * then let the host reset code handle this + */ + if (session->state != ISCSI_STATE_LOGGED_IN || + sc->SCp.phase != session->age) + goto failed; + + /* ctask completed before time out */ + if (!ctask->sc) + goto success; + + /* what should we do here ? */ + if (conn->ctask == ctask) { + printk(KERN_INFO "sc %p itt 0x%x partially sent. Failing " + "abort\n", sc, ctask->itt); + goto failed; + } + + /* check for the easy pending cmd abort */ + while (__kfifo_get(conn->xmitqueue, (void*)&tmp_ctask, sizeof(void*))) { + if (tmp_ctask->itt == ctask->itt) { + debug_scsi("found pending task\n"); + goto success; } + __kfifo_put(conn->xmitqueue, (void*)&tmp_ctask, sizeof(void*)); + } + + conn->tmabort_state = TMABORT_INITIAL; + + spin_unlock_bh(&session->lock); + rc = iscsi_exec_abort_task(sc, ctask); + spin_lock_bh(&session->lock); + + iscsi_ctask_mtask_cleanup(ctask); + if (rc || sc->SCp.phase != session->age || + session->state != ISCSI_STATE_LOGGED_IN) + goto failed; + + /* ctask completed before tmf abort response */ + if (!ctask->sc) { + debug_scsi("sc completed while abort in progress\n"); + goto success; + } + + if (conn->tmabort_state != TMABORT_SUCCESS) { spin_unlock_bh(&session->lock); - break; + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + spin_lock_bh(&session->lock); + goto failed; } success: debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - rc = SUCCESS; - goto exit; - -failed: - debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - rc = FAILED; - -exit: - del_timer_sync(&conn->tmabort_timer); + spin_unlock_bh(&session->lock); - mutex_lock(&conn->xmitmutex); + /* clean up task if aborted */ if (conn->sock) { struct sock *sk = conn->sock->sk; write_lock_bh(&sk->sk_callback_lock); - iscsi_ctask_cleanup(conn, ctask); + spin_lock(&session->lock); + fail_command(conn, ctask, DRIVER_TIMEOUT << 24); + spin_unlock(&session->lock); write_unlock_bh(&sk->sk_callback_lock); } mutex_unlock(&conn->xmitmutex); - return rc; + return SUCCESS; + +failed: + spin_unlock_bh(&session->lock); + mutex_unlock(&conn->xmitmutex); + + debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + return FAILED; } static int @@ -3359,16 +3499,6 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, struct iscsi_conn *conn = cls_conn->dd_data; struct iscsi_session *session = conn->session; - spin_lock_bh(&session->lock); - if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && - conn->stop_stage != STOP_CONN_RECOVER) { - printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n", - param); - spin_unlock_bh(&session->lock); - return 0; - } - spin_unlock_bh(&session->lock); - switch(param) { case ISCSI_PARAM_MAX_RECV_DLENGTH: { char *saveptr = conn->data; @@ -3691,6 +3821,7 @@ static struct iscsi_transport iscsi_tcp_transport = { .stop_conn = iscsi_conn_stop, .send_pdu = iscsi_conn_send_pdu, .get_stats = iscsi_conn_get_stats, + .session_recovery_timedout = iscsi_session_recovery_timedout, }; static int __init diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index ba26741..12ef641 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -159,6 +159,7 @@ struct iscsi_conn { struct kfifo *immqueue; /* immediate xmit queue */ struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ struct kfifo *xmitqueue; /* data-path cmd queue */ + struct list_head run_list; /* list of cmds in progress */ struct work_struct xmitwork; /* per-conn. xmit workqueue */ struct mutex xmitmutex; /* serializes connection xmit, * access to kfifos: * @@ -228,6 +229,7 @@ struct iscsi_session { * - mgmtpool, * * - r2tpool */ int state; /* session state */ + int recovery_failed; struct list_head item; void *auth_client; int conn_cnt; @@ -310,6 +312,7 @@ struct iscsi_cmd_task { struct iscsi_conn *conn; /* used connection */ struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ + struct list_head running; /* running cmd list */ struct iscsi_r2t_info *r2t; /* in progress R2T */ struct iscsi_queue r2tpool; struct kfifo *r2tqueue; diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 72a71eb..e2b67e3 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -31,17 +31,17 @@ #include <scsi/scsi_transport_iscsi.h> #include <scsi/iscsi_if.h> -#define ISCSI_SESSION_ATTRS 10 +#define ISCSI_SESSION_ATTRS 11 #define ISCSI_CONN_ATTRS 10 +#define ISCSI_HOST_ATTRS 0 struct iscsi_internal { struct scsi_transport_template t; struct iscsi_transport *iscsi_transport; struct list_head list; struct class_device cdev; - /* - * We do not have any private or other attrs. - */ + + struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; struct transport_container conn_cont; struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; struct transport_container session_cont; @@ -114,6 +114,24 @@ static struct attribute_group iscsi_transport_group = { .attrs = iscsi_transport_attrs, }; +static int iscsi_setup_host(struct transport_container *tc, struct device *dev, + struct class_device *cdev) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + struct iscsi_host *ihost = shost->shost_data; + + memset(ihost, 0, sizeof(*ihost)); + INIT_LIST_HEAD(&ihost->sessions); + mutex_init(&ihost->mutex); + return 0; +} + +static DECLARE_TRANSPORT_CLASS(iscsi_host_class, + "iscsi_host", + iscsi_setup_host, + NULL, + NULL); + static DECLARE_TRANSPORT_CLASS(iscsi_session_class, "iscsi_session", NULL, @@ -225,6 +243,54 @@ static int iscsi_is_session_dev(const struct device *dev) return dev->release == iscsi_session_release; } +static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, + uint id, uint lun) +{ + struct iscsi_host *ihost = shost->shost_data; + struct iscsi_cls_session *session; + + mutex_lock(&ihost->mutex); + list_for_each_entry(session, &ihost->sessions, host_list) { + if ((channel == SCAN_WILD_CARD || + channel == session->channel) && + (id == SCAN_WILD_CARD || id == session->target_id)) + scsi_scan_target(&session->dev, session->channel, + session->target_id, lun, 1); + } + mutex_unlock(&ihost->mutex); + + return 0; +} + +static void session_recovery_timedout(void *data) +{ + struct iscsi_cls_session *session = data; + + dev_printk(KERN_INFO, &session->dev, "session recovery timed out " + "after %d secs\n", session->recovery_tmo); + + if (session->transport->session_recovery_timedout) + session->transport->session_recovery_timedout(session); + + scsi_target_unblock(&session->dev); +} + +void iscsi_unblock_session(struct iscsi_cls_session *session) +{ + if (!cancel_delayed_work(&session->recovery_work)) + flush_scheduled_work(); + scsi_target_unblock(&session->dev); +} +EXPORT_SYMBOL_GPL(iscsi_unblock_session); + +void iscsi_block_session(struct iscsi_cls_session *session) +{ + scsi_target_block(&session->dev); + schedule_delayed_work(&session->recovery_work, + session->recovery_tmo * HZ); +} +EXPORT_SYMBOL_GPL(iscsi_block_session); + /** * iscsi_create_session - create iscsi class session * @shost: scsi host @@ -233,8 +299,10 @@ static int iscsi_is_session_dev(const struct device *dev) * This can be called from a LLD or iscsi_transport. **/ struct iscsi_cls_session * -iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) +iscsi_create_session(struct Scsi_Host *shost, + struct iscsi_transport *transport, int channel) { + struct iscsi_host *ihost; struct iscsi_cls_session *session; int err; @@ -246,13 +314,22 @@ iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) if (!session) goto module_put; session->transport = transport; + session->recovery_tmo = 120; + INIT_WORK(&session->recovery_work, session_recovery_timedout, session); + INIT_LIST_HEAD(&session->host_list); + INIT_LIST_HEAD(&session->sess_list); if (transport->sessiondata_size) session->dd_data = &session[1]; /* this is released in the dev's release function */ scsi_host_get(shost); + ihost = shost->shost_data; + session->sid = iscsi_session_nr++; + session->channel = channel; + session->target_id = ihost->next_target_id++; + snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", session->sid); session->dev.parent = &shost->shost_gendev; @@ -265,6 +342,10 @@ iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) } transport_register_device(&session->dev); + mutex_lock(&ihost->mutex); + list_add(&session->host_list, &ihost->sessions); + mutex_unlock(&ihost->mutex); + return session; free_session: @@ -285,6 +366,16 @@ EXPORT_SYMBOL_GPL(iscsi_create_session); **/ int iscsi_destroy_session(struct iscsi_cls_session *session) { + struct Scsi_Host *shost = iscsi_session_to_shost(session); + struct iscsi_host *ihost = shost->shost_data; + + if (!cancel_delayed_work(&session->recovery_work)) + flush_scheduled_work(); + + mutex_lock(&ihost->mutex); + list_del(&session->host_list); + mutex_unlock(&ihost->mutex); + transport_unregister_device(&session->dev); device_unregister(&session->dev); return 0; @@ -435,7 +526,7 @@ iscsi_transport_create_session(struct scsi_transport_template *scsit, if (scsi_add_host(shost, NULL)) goto free_host; - session = iscsi_create_session(shost, transport); + session = iscsi_create_session(shost, transport, 0); if (!session) goto remove_host; @@ -466,12 +557,13 @@ int iscsi_transport_destroy_session(struct Scsi_Host *shost) struct iscsi_cls_session *session; unsigned long flags; - scsi_remove_host(shost); session = hostdata_session(shost->hostdata); spin_lock_irqsave(&sesslock, flags); list_del(&session->sess_list); spin_unlock_irqrestore(&sesslock, flags); iscsi_destroy_session(session); + + scsi_remove_host(shost); /* ref from host alloc */ scsi_host_put(shost); return 0; @@ -594,6 +686,7 @@ iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) } spin_lock_irqsave(&zone->freelock, flags); + INIT_LIST_HEAD(skb_to_lh(skb)); list_add(skb_to_lh(skb), &zone->freequeue); spin_unlock_irqrestore(&zone->freelock, flags); @@ -888,6 +981,11 @@ iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) return -EINVAL; switch (ev->u.set_param.param) { + case ISCSI_PARAM_SESS_RECOVERY_TMO: + iscsi_copy_param(ev, &value, data); + if (value != 0) + session->recovery_tmo = value; + break; case ISCSI_PARAM_TARGET_NAME: /* this should not change between logins */ if (session->targetname) @@ -980,7 +1078,6 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) ev->r.retcode = transport->start_conn(conn); else err = -EINVAL; - break; case ISCSI_UEVENT_STOP_CONN: conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); @@ -1198,6 +1295,7 @@ static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ NULL) iscsi_priv_session_attr(targetname, "%s"); iscsi_priv_session_attr(tpgt, "%d"); +iscsi_priv_session_attr(recovery_tmo, "%d"); #define iscsi_priv_conn_attr_show(field, format) \ static ssize_t \ @@ -1289,6 +1387,24 @@ static int iscsi_conn_match(struct attribute_container *cont, return &priv->conn_cont.ac == cont; } +static int iscsi_host_match(struct attribute_container *cont, + struct device *dev) +{ + struct Scsi_Host *shost; + struct iscsi_internal *priv; + + if (!scsi_is_host_device(dev)) + return 0; + + shost = dev_to_shost(dev); + if (!shost->transportt || + shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) + return 0; + + priv = to_iscsi_internal(shost->transportt); + return &priv->t.host_attrs.ac == cont; +} + struct scsi_transport_template * iscsi_register_transport(struct iscsi_transport *tt) { @@ -1307,6 +1423,7 @@ iscsi_register_transport(struct iscsi_transport *tt) return NULL; INIT_LIST_HEAD(&priv->list); priv->iscsi_transport = tt; + priv->t.user_scan = iscsi_user_scan; priv->cdev.class = &iscsi_transport_class; snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); @@ -1318,6 +1435,14 @@ iscsi_register_transport(struct iscsi_transport *tt) if (err) goto unregister_cdev; + /* host parameters */ + priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; + priv->t.host_attrs.ac.class = &iscsi_host_class.class; + priv->t.host_attrs.ac.match = iscsi_host_match; + priv->t.host_size = sizeof(struct iscsi_host); + priv->host_attrs[0] = NULL; + transport_container_register(&priv->t.host_attrs); + /* connection parameters */ priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; priv->conn_cont.ac.class = &iscsi_connection_class.class; @@ -1361,6 +1486,7 @@ iscsi_register_transport(struct iscsi_transport *tt) SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); + SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); if (tt->param_mask & ISCSI_TARGET_NAME) SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); @@ -1408,6 +1534,7 @@ int iscsi_unregister_transport(struct iscsi_transport *tt) transport_container_unregister(&priv->conn_cont); transport_container_unregister(&priv->session_cont); + transport_container_unregister(&priv->t.host_attrs); sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); class_device_unregister(&priv->cdev); @@ -1451,10 +1578,14 @@ static __init int iscsi_transport_init(void) if (err) return err; - err = transport_class_register(&iscsi_connection_class); + err = transport_class_register(&iscsi_host_class); if (err) goto unregister_transport_class; + err = transport_class_register(&iscsi_connection_class); + if (err) + goto unregister_host_class; + err = transport_class_register(&iscsi_session_class); if (err) goto unregister_conn_class; @@ -1482,6 +1613,8 @@ unregister_session_class: transport_class_unregister(&iscsi_session_class); unregister_conn_class: transport_class_unregister(&iscsi_connection_class); +unregister_host_class: + transport_class_unregister(&iscsi_host_class); unregister_transport_class: class_unregister(&iscsi_transport_class); return err; @@ -1494,6 +1627,7 @@ static void __exit iscsi_transport_exit(void) netlink_unregister_notifier(&iscsi_nl_notifier); transport_class_unregister(&iscsi_connection_class); transport_class_unregister(&iscsi_session_class); + transport_class_unregister(&iscsi_host_class); class_unregister(&iscsi_transport_class); } diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h index 2c3a89b..eebe2b1 100644 --- a/include/scsi/iscsi_if.h +++ b/include/scsi/iscsi_if.h @@ -174,6 +174,7 @@ enum iscsi_param { ISCSI_PARAM_TPGT, ISCSI_PARAM_PERSISTENT_ADDRESS, ISCSI_PARAM_PERSISTENT_PORT, + ISCSI_PARAM_SESS_RECOVERY_TMO, /* pased in through bind conn using transport_fd */ ISCSI_PARAM_CONN_PORT, @@ -201,6 +202,7 @@ enum iscsi_param { #define ISCSI_TPGT (1 << ISCSI_PARAM_TPGT) #define ISCSI_PERSISTENT_ADDRESS (1 << ISCSI_PARAM_PERSISTENT_ADDRESS) #define ISCSI_PERSISTENT_PORT (1 << ISCSI_PARAM_PERSISTENT_PORT) +#define ISCSI_SESS_RECOVERY_TMO (1 << ISCSI_PARAM_SESS_RECOVERY_TMO) #define ISCSI_CONN_PORT (1 << ISCSI_PARAM_CONN_PORT) #define ISCSI_CONN_ADDRESS (1 << ISCSI_PARAM_CONN_ADDRESS) diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h index 4b20064..9d2b991 100644 --- a/include/scsi/scsi_transport_iscsi.h +++ b/include/scsi/scsi_transport_iscsi.h @@ -90,6 +90,7 @@ struct iscsi_transport { char *data, uint32_t data_size); void (*get_stats) (struct iscsi_cls_conn *conn, struct iscsi_stats *stats); + void (*session_recovery_timedout) (struct iscsi_cls_session *session); }; /* @@ -130,12 +131,20 @@ struct iscsi_cls_conn { struct iscsi_cls_session { struct list_head sess_list; /* item in session_list */ + struct list_head host_list; struct iscsi_transport *transport; /* iSCSI values used as unique id by userspace. */ char *targetname; int tpgt; + /* recovery fields */ + int recovery_tmo; + struct work_struct recovery_work; + + int target_id; + int channel; + int sid; /* session id */ void *dd_data; /* LLD private data */ struct device dev; /* sysfs transport/container device */ @@ -147,15 +156,23 @@ struct iscsi_cls_session { #define iscsi_session_to_shost(_session) \ dev_to_shost(_session->dev.parent) +struct iscsi_host { + int next_target_id; + struct list_head sessions; + struct mutex mutex; +}; + /* * session and connection functions that can be used by HW iSCSI LLDs */ extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, - struct iscsi_transport *t); + struct iscsi_transport *t, int channel); extern int iscsi_destroy_session(struct iscsi_cls_session *session); extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, uint32_t cid); extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); +extern void iscsi_unblock_session(struct iscsi_cls_session *session); +extern void iscsi_block_session(struct iscsi_cls_session *session); /* * session functions used by software iscsi |
