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[SCSI] iscsi class, libiscsi: add iscsi sysfs session state file

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This adds a iscsi session state file which exports the session
state for both software and hardware iscsi. It also hooks libiscsi
in.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie
2008-01-31 13:36:43 -06:00
committed by James Bottomley
parent 84ac86ca8c
commit 6eabafbe66
4 changed files with 161 additions and 33 deletions
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41
drivers/scsi/libiscsi.c
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@@ -996,6 +996,7 @@ enum {
FAILURE_SESSION_IN_RECOVERY,
FAILURE_SESSION_RECOVERY_TIMEOUT,
FAILURE_SESSION_LOGGING_OUT,
FAILURE_SESSION_NOT_READY,
};
int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
@@ -1016,6 +1017,12 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
session = iscsi_hostdata(host->hostdata);
spin_lock(&session->lock);
reason = iscsi_session_chkready(session_to_cls(session));
if (reason) {
sc->result = reason;
goto fault;
}
/*
* ISCSI_STATE_FAILED is a temp. state. The recovery
* code will decide what is best to do with command queued
@@ -1032,18 +1039,23 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
switch (session->state) {
case ISCSI_STATE_IN_RECOVERY:
reason = FAILURE_SESSION_IN_RECOVERY;
goto reject;
sc->result = DID_IMM_RETRY << 16;
break;
case ISCSI_STATE_LOGGING_OUT:
reason = FAILURE_SESSION_LOGGING_OUT;
goto reject;
sc->result = DID_IMM_RETRY << 16;
break;
case ISCSI_STATE_RECOVERY_FAILED:
reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
sc->result = DID_NO_CONNECT << 16;
break;
case ISCSI_STATE_TERMINATE:
reason = FAILURE_SESSION_TERMINATE;
sc->result = DID_NO_CONNECT << 16;
break;
default:
reason = FAILURE_SESSION_FREED;
sc->result = DID_NO_CONNECT << 16;
}
goto fault;
}
@@ -1051,6 +1063,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
conn = session->leadconn;
if (!conn) {
reason = FAILURE_SESSION_FREED;
sc->result = DID_NO_CONNECT << 16;
goto fault;
}
@@ -1090,9 +1103,7 @@ reject:
fault:
spin_unlock(&session->lock);
printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
sc->cmnd[0], reason);
sc->result = (DID_NO_CONNECT << 16);
debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
scsi_set_resid(sc, scsi_bufflen(sc));
sc->scsi_done(sc);
spin_lock(host->host_lock);
@@ -1238,7 +1249,8 @@ static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
* Fail commands. session lock held and recv side suspended and xmit
* thread flushed
*/
static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
int error)
{
struct iscsi_cmd_task *ctask, *tmp;
@@ -1250,7 +1262,7 @@ static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
if (lun == ctask->sc->device->lun || lun == -1) {
debug_scsi("failing pending sc %p itt 0x%x\n",
ctask->sc, ctask->itt);
fail_command(conn, ctask, DID_BUS_BUSY << 16);
fail_command(conn, ctask, error << 16);
}
}
@@ -1258,7 +1270,7 @@ static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
if (lun == ctask->sc->device->lun || lun == -1) {
debug_scsi("failing requeued sc %p itt 0x%x\n",
ctask->sc, ctask->itt);
fail_command(conn, ctask, DID_BUS_BUSY << 16);
fail_command(conn, ctask, error << 16);
}
}
@@ -1572,7 +1584,7 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
/* need to grab the recv lock then session lock */
write_lock_bh(conn->recv_lock);
spin_lock(&session->lock);
fail_all_commands(conn, sc->device->lun);
fail_all_commands(conn, sc->device->lun, DID_ERROR);
conn->tmf_state = TMF_INITIAL;
spin_unlock(&session->lock);
write_unlock_bh(conn->recv_lock);
@@ -2018,11 +2030,7 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
conn->stop_stage = 0;
conn->tmf_state = TMF_INITIAL;
session->age++;
spin_unlock_bh(&session->lock);
iscsi_unblock_session(session_to_cls(session));
wake_up(&conn->ehwait);
return 0;
break;
case STOP_CONN_TERM:
conn->stop_stage = 0;
break;
@@ -2031,6 +2039,8 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
}
spin_unlock_bh(&session->lock);
iscsi_unblock_session(session_to_cls(session));
wake_up(&conn->ehwait);
return 0;
}
EXPORT_SYMBOL_GPL(iscsi_conn_start);
@@ -2122,7 +2132,8 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
* flush queues.
*/
spin_lock_bh(&session->lock);
fail_all_commands(conn, -1);
fail_all_commands(conn, -1,
STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
flush_control_queues(session, conn);
spin_unlock_bh(&session->lock);
mutex_unlock(&session->eh_mutex);