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author | Mike Christie <michaelc@cs.wisc.edu> | 2009-05-14 00:57:49 +0200 |
---|---|---|
committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-05-23 22:44:13 +0200 |
commit | b3cd5050bf8eb32ceecee129cac7c59e6f1668c4 (patch) | |
tree | 5aa4999dd1c5c7fe83354f3965764f0849afaff3 /drivers/scsi/libiscsi.c | |
parent | [SCSI] libiscsi: check if iscsi host has work queue before queueing work (diff) | |
download | linux-b3cd5050bf8eb32ceecee129cac7c59e6f1668c4.tar.xz linux-b3cd5050bf8eb32ceecee129cac7c59e6f1668c4.zip |
[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>
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r-- | drivers/scsi/libiscsi.c | 60 |
1 files changed, 35 insertions, 25 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index dafa054537f6..b00be6c3efc1 100644 --- 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); |