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[SCSI] iscsi: fix command requeues during iscsi recovery

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Do not flush queues then block session. This will cause commands
to needlessly swing around on us and remove goofy
recovery_failed field and replace with state value.

And do not start recovery from within the host reset function.
This causeis too many problems becuase open-iscsi was desinged to
call out to userspace then have userpscae decide if we should
go into recovery or kill the session.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2006-05-18 20:31:42 -05:00 committed by James Bottomley
parent 790f39a2d5
commit 656cffc95f
3 changed files with 50 additions and 42 deletions
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87
drivers/scsi/libiscsi.c
View File

@ -487,6 +487,11 @@ void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
unsigned long flags;
spin_lock_irqsave(&session->lock, flags);
if (session->state == ISCSI_STATE_FAILED) {
spin_unlock_irqrestore(&session->lock, flags);
return;
}
if (session->conn_cnt == 1 || session->leadconn == conn)
session->state = ISCSI_STATE_FAILED;
spin_unlock_irqrestore(&session->lock, flags);
@ -612,6 +617,7 @@ enum {
FAILURE_SESSION_FREED,
FAILURE_WINDOW_CLOSED,
FAILURE_SESSION_TERMINATE,
FAILURE_SESSION_IN_RECOVERY,
FAILURE_SESSION_RECOVERY_TIMEOUT,
};
@ -631,18 +637,30 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
spin_lock(&session->lock);
if (session->state != ISCSI_STATE_LOGGED_IN) {
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) {
reason = FAILURE_SESSION_TERMINATE;
/*
* ISCSI_STATE_FAILED is a temp. state. The recovery
* code will decide what is best to do with command queued
* during this time
*/
if (session->state != ISCSI_STATE_LOGGED_IN &&
session->state != ISCSI_STATE_FAILED) {
/*
* to handle the race between when we set the recovery state
* and block the session we requeue here (commands could
* be entering our queuecommand while a block is starting
* up because the block code is not locked)
*/
if (session->state == ISCSI_STATE_IN_RECOVERY) {
reason = FAILURE_SESSION_IN_RECOVERY;
goto fault;
}
reason = FAILURE_SESSION_FREED;
if (session->state == ISCSI_STATE_RECOVERY_FAILED)
reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
else if (session->state == ISCSI_STATE_TERMINATE)
reason = FAILURE_SESSION_TERMINATE;
else
reason = FAILURE_SESSION_FREED;
goto fault;
}
@ -728,8 +746,8 @@ iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
*/
mtask = conn->login_mtask;
else {
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
if (!__kfifo_get(session->mgmtpool.queue,
@ -803,7 +821,7 @@ void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
spin_lock_bh(&session->lock);
if (session->state != ISCSI_STATE_LOGGED_IN) {
session->recovery_failed = 1;
session->state = ISCSI_STATE_RECOVERY_FAILED;
if (conn)
wake_up(&conn->ehwait);
}
@ -838,20 +856,14 @@ failed:
* we drop the lock here but the leadconn cannot be destoyed while
* we are in the scsi eh
*/
if (fail_session) {
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);
session->state == ISCSI_STATE_RECOVERY_FAILED);
if (signal_pending(current))
flush_signals(current);
@ -940,8 +952,7 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
wait_event_interruptible(conn->ehwait,
sc->SCp.phase != session->age ||
session->state != ISCSI_STATE_LOGGED_IN ||
conn->tmabort_state != TMABORT_INITIAL ||
session->recovery_failed);
conn->tmabort_state != TMABORT_INITIAL);
if (signal_pending(current))
flush_signals(current);
del_timer_sync(&conn->tmabort_timer);
@ -1491,7 +1502,6 @@ int 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);
iscsi_unblock_session(session_to_cls(session));
@ -1566,8 +1576,8 @@ static void fail_all_commands(struct iscsi_conn *conn)
conn->ctask = NULL;
}
void iscsi_start_session_recovery(struct iscsi_session *session,
struct iscsi_conn *conn, int flag)
static void iscsi_start_session_recovery(struct iscsi_session *session,
struct iscsi_conn *conn, int flag)
{
int old_stop_stage;
@ -1597,19 +1607,10 @@ void iscsi_start_session_recovery(struct iscsi_session *session,
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
if (session->conn_cnt == 0 || session->leadconn == conn)
session->state = ISCSI_STATE_FAILED;
session->state = ISCSI_STATE_IN_RECOVERY;
spin_unlock_bh(&session->lock);
session->tt->terminate_conn(conn);
/*
* flush queues.
*/
spin_lock_bh(&session->lock);
fail_all_commands(conn);
flush_control_queues(session, conn);
spin_unlock_bh(&session->lock);
/*
* for connection level recovery we should not calculate
* header digest. conn->hdr_size used for optimization
@ -1619,18 +1620,26 @@ 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_FAILED &&
if (session->state == ISCSI_STATE_IN_RECOVERY &&
old_stop_stage != STOP_CONN_RECOVER)
iscsi_block_session(session_to_cls(session));
}
session->tt->terminate_conn(conn);
/*
* flush queues.
*/
spin_lock_bh(&session->lock);
fail_all_commands(conn);
flush_control_queues(session, conn);
spin_unlock_bh(&session->lock);
mutex_unlock(&conn->xmitmutex);
}
EXPORT_SYMBOL_GPL(iscsi_start_session_recovery);
void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{

3
include/scsi/libiscsi.h
View File

@ -210,7 +210,6 @@ struct iscsi_session {
* - mgmtpool, *
* - r2tpool */
int state; /* session state */
int recovery_failed;
struct list_head item;
int conn_cnt;
int age; /* counts session re-opens */
@ -241,8 +240,6 @@ iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
int, int, uint32_t, uint32_t *);
extern void iscsi_session_teardown(struct iscsi_cls_session *);
extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *);
extern void iscsi_start_session_recovery(struct iscsi_session *,
struct iscsi_conn *, int);
extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
#define session_to_cls(_sess) \

2
include/scsi/scsi_transport_iscsi.h
View File

@ -173,6 +173,8 @@ struct iscsi_cls_conn {
#define ISCSI_STATE_LOGGED_IN 2
#define ISCSI_STATE_FAILED 3
#define ISCSI_STATE_TERMINATE 4
#define ISCSI_STATE_IN_RECOVERY 5
#define ISCSI_STATE_RECOVERY_FAILED 6
struct iscsi_cls_session {
struct list_head sess_list; /* item in session_list */