iscsi bugfixes

iscsi bugfixes

[michaelc]

These next patches fix iscsi interop bugs and oopses. The patches
were made against scsi-misc but apply to scsi-rc-fixes cleanly.

[PATCH 1/5] iscsi class: fix slab corruption during restart

[michaelc]

From: Mike Christie <michaelc@cs.wisc.edu>

The transport class recv mempools are causing slab corruption.
We could hack around netlink's lack of mempool support like dm,
but it is just too ulgy (dm's hack is ugly enough :) when you need
to support broadcast.

This patch removes the recv pools. We have not used them even when
we were allocting 20 MB per session and the system only had 64 MBs.
And we have no pools on the send side and have been ok there. When
Peter's work gets merged we can use that since the network guys
are in favor of that approach and are not going to add mempools
everywhere.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
---
 drivers/scsi/scsi_transport_iscsi.c |  246 ++---------------------------------
 include/scsi/scsi_transport_iscsi.h |    4 -
 2 files changed, 17 insertions(+), 233 deletions(-)

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 7b0019c..2d3baa9 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -21,7 +21,6 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 #include <linux/module.h>
-#include <linux/mempool.h>
 #include <linux/mutex.h>
 #include <net/tcp.h>
 #include <scsi/scsi.h>
@@ -149,30 +148,6 @@ static DECLARE_TRANSPORT_CLASS(iscsi_con
 static struct sock *nls;
 static DEFINE_MUTEX(rx_queue_mutex);
 
-struct mempool_zone {
-	mempool_t *pool;
-	atomic_t allocated;
-	int size;
-	int hiwat;
-	struct list_head freequeue;
-	spinlock_t freelock;
-};
-
-static struct mempool_zone *z_reply;
-
-/*
- * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
- * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
- *             so daemon will notice OOM on NETLINK tranposrt level and will
- *             be able to predict or change operational behavior
- */
-#define Z_MAX_REPLY	8
-#define Z_HIWAT_REPLY	6
-#define Z_MAX_PDU	8
-#define Z_HIWAT_PDU	6
-#define Z_MAX_ERROR	16
-#define Z_HIWAT_ERROR	12
-
 static LIST_HEAD(sesslist);
 static DEFINE_SPINLOCK(sesslock);
 static LIST_HEAD(connlist);
@@ -414,59 +389,11 @@ int iscsi_destroy_session(struct iscsi_c
 }
 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
 
-static void mempool_zone_destroy(struct mempool_zone *zp)
-{
-	mempool_destroy(zp->pool);
-	kfree(zp);
-}
-
-static void*
-mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data)
-{
-	struct mempool_zone *zone = pool_data;
-
-	return alloc_skb(zone->size, gfp_mask);
-}
-
-static void
-mempool_zone_free_skb(void *element, void *pool_data)
-{
-	kfree_skb(element);
-}
-
-static struct mempool_zone *
-mempool_zone_init(unsigned max, unsigned size, unsigned hiwat)
-{
-	struct mempool_zone *zp;
-
-	zp = kzalloc(sizeof(*zp), GFP_KERNEL);
-	if (!zp)
-		return NULL;
-
-	zp->size = size;
-	zp->hiwat = hiwat;
-	INIT_LIST_HEAD(&zp->freequeue);
-	spin_lock_init(&zp->freelock);
-	atomic_set(&zp->allocated, 0);
-
-	zp->pool = mempool_create(max, mempool_zone_alloc_skb,
-				  mempool_zone_free_skb, zp);
-	if (!zp->pool) {
-		kfree(zp);
-		return NULL;
-	}
-
-	return zp;
-}
-
 static void iscsi_conn_release(struct device *dev)
 {
 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
 	struct device *parent = conn->dev.parent;
 
-	mempool_zone_destroy(conn->z_pdu);
-	mempool_zone_destroy(conn->z_error);
-
 	kfree(conn);
 	put_device(parent);
 }
@@ -476,31 +403,6 @@ static int iscsi_is_conn_dev(const struc
 	return dev->release == iscsi_conn_release;
 }
 
-static int iscsi_create_event_pools(struct iscsi_cls_conn *conn)
-{
-	conn->z_pdu = mempool_zone_init(Z_MAX_PDU,
-			NLMSG_SPACE(sizeof(struct iscsi_uevent) +
-				    sizeof(struct iscsi_hdr) +
-				    DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
-			Z_HIWAT_PDU);
-	if (!conn->z_pdu) {
-		dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
-			   "pdu zone for new conn\n");
-		return -ENOMEM;
-	}
-
-	conn->z_error = mempool_zone_init(Z_MAX_ERROR,
-			NLMSG_SPACE(sizeof(struct iscsi_uevent)),
-			Z_HIWAT_ERROR);
-	if (!conn->z_error) {
-		dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
-			   "error zone for new conn\n");
-		mempool_zone_destroy(conn->z_pdu);
-		return -ENOMEM;
-	}
-	return 0;
-}
-
 /**
  * iscsi_create_conn - create iscsi class connection
  * @session: iscsi cls session
@@ -533,12 +435,9 @@ iscsi_create_conn(struct iscsi_cls_sessi
 	conn->transport = transport;
 	conn->cid = cid;
 
-	if (iscsi_create_event_pools(conn))
-		goto free_conn;
-
 	/* this is released in the dev's release function */
 	if (!get_device(&session->dev))
-		goto free_conn_pools;
+		goto free_conn;
 
 	snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
 		 session->sid, cid);
@@ -555,8 +454,6 @@ iscsi_create_conn(struct iscsi_cls_sessi
 
 release_parent_ref:
 	put_device(&session->dev);
-free_conn_pools:
-
 free_conn:
 	kfree(conn);
 	return NULL;
@@ -599,81 +496,31 @@ iscsi_if_transport_lookup(struct iscsi_t
 	return NULL;
 }
 
-static inline struct list_head *skb_to_lh(struct sk_buff *skb)
-{
-	return (struct list_head *)&skb->cb;
-}
-
-static void
-mempool_zone_complete(struct mempool_zone *zone)
-{
-	unsigned long flags;
-	struct list_head *lh, *n;
-
-	spin_lock_irqsave(&zone->freelock, flags);
-	list_for_each_safe(lh, n, &zone->freequeue) {
-		struct sk_buff *skb = (struct sk_buff *)((char *)lh -
-				offsetof(struct sk_buff, cb));
-		if (!skb_shared(skb)) {
-			list_del(skb_to_lh(skb));
-			mempool_free(skb, zone->pool);
-			atomic_dec(&zone->allocated);
-		}
-	}
-	spin_unlock_irqrestore(&zone->freelock, flags);
-}
-
-static struct sk_buff*
-mempool_zone_get_skb(struct mempool_zone *zone)
-{
-	struct sk_buff *skb;
-
-	skb = mempool_alloc(zone->pool, GFP_ATOMIC);
-	if (skb)
-		atomic_inc(&zone->allocated);
-	return skb;
-}
-
 static int
-iscsi_broadcast_skb(struct mempool_zone *zone, struct sk_buff *skb, gfp_t gfp)
+iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
 {
-	unsigned long flags;
 	int rc;
 
-	skb_get(skb);
 	rc = netlink_broadcast(nls, skb, 0, 1, gfp);
 	if (rc < 0) {
-		mempool_free(skb, zone->pool);
 		printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
 		return rc;
 	}
 
-	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);
 	return 0;
 }
 
 static int
-iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid)
+iscsi_unicast_skb(struct sk_buff *skb, int pid)
 {
-	unsigned long flags;
 	int rc;
 
-	skb_get(skb);
 	rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
 	if (rc < 0) {
-		mempool_free(skb, zone->pool);
 		printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
 		return rc;
 	}
 
-	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);
-
 	return 0;
 }
 
@@ -692,9 +539,7 @@ int iscsi_recv_pdu(struct iscsi_cls_conn
 	if (!priv)
 		return -EINVAL;
 
-	mempool_zone_complete(conn->z_pdu);
-
-	skb = mempool_zone_get_skb(conn->z_pdu);
+	skb = alloc_skb(len, GFP_ATOMIC);
 	if (!skb) {
 		iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
 		dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver "
@@ -707,15 +552,13 @@ int iscsi_recv_pdu(struct iscsi_cls_conn
 	memset(ev, 0, sizeof(*ev));
 	ev->transport_handle = iscsi_handle(conn->transport);
 	ev->type = ISCSI_KEVENT_RECV_PDU;
-	if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
-		ev->iferror = -ENOMEM;
 	ev->r.recv_req.cid = conn->cid;
 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
 	pdu = (char*)ev + sizeof(*ev);
 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
 
-	return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid);
+	return iscsi_unicast_skb(skb, priv->daemon_pid);
 }
 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
 
@@ -731,9 +574,7 @@ void iscsi_conn_error(struct iscsi_cls_c
 	if (!priv)
 		return;
 
-	mempool_zone_complete(conn->z_error);
-
-	skb = mempool_zone_get_skb(conn->z_error);
+	skb = alloc_skb(len, GFP_ATOMIC);
 	if (!skb) {
 		dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored "
 			  "conn error (%d)\n", error);
@@ -744,13 +585,11 @@ void iscsi_conn_error(struct iscsi_cls_c
 	ev = NLMSG_DATA(nlh);
 	ev->transport_handle = iscsi_handle(conn->transport);
 	ev->type = ISCSI_KEVENT_CONN_ERROR;
-	if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat)
-		ev->iferror = -ENOMEM;
 	ev->r.connerror.error = error;
 	ev->r.connerror.cid = conn->cid;
 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
 
-	iscsi_broadcast_skb(conn->z_error, skb, GFP_ATOMIC);
+	iscsi_broadcast_skb(skb, GFP_ATOMIC);
 
 	dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n",
 		   error);
@@ -767,9 +606,7 @@ iscsi_if_send_reply(int pid, int seq, in
 	int flags = multi ? NLM_F_MULTI : 0;
 	int t = done ? NLMSG_DONE : type;
 
-	mempool_zone_complete(z_reply);
-
-	skb = mempool_zone_get_skb(z_reply);
+	skb = alloc_skb(len, GFP_ATOMIC);
 	/*
 	 * FIXME:
 	 * user is supposed to react on iferror == -ENOMEM;
@@ -780,7 +617,7 @@ iscsi_if_send_reply(int pid, int seq, in
 	nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
 	nlh->nlmsg_flags = flags;
 	memcpy(NLMSG_DATA(nlh), payload, size);
-	return iscsi_unicast_skb(z_reply, skb, pid);
+	return iscsi_unicast_skb(skb, pid);
 }
 
 static int
@@ -810,9 +647,7 @@ iscsi_if_get_stats(struct iscsi_transpor
 	do {
 		int actual_size;
 
-		mempool_zone_complete(conn->z_pdu);
-
-		skbstat = mempool_zone_get_skb(conn->z_pdu);
+		skbstat = alloc_skb(len, GFP_ATOMIC);
 		if (!skbstat) {
 			dev_printk(KERN_ERR, &conn->dev, "iscsi: can not "
 				   "deliver stats: OOM\n");
@@ -825,8 +660,6 @@ iscsi_if_get_stats(struct iscsi_transpor
 		memset(evstat, 0, sizeof(*evstat));
 		evstat->transport_handle = iscsi_handle(conn->transport);
 		evstat->type = nlh->nlmsg_type;
-		if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
-			evstat->iferror = -ENOMEM;
 		evstat->u.get_stats.cid =
 			ev->u.get_stats.cid;
 		evstat->u.get_stats.sid =
@@ -845,7 +678,7 @@ iscsi_if_get_stats(struct iscsi_transpor
 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
 		nlhstat->nlmsg_len = actual_size;
 
-		err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid);
+		err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
 	} while (err < 0 && err != -ECONNREFUSED);
 
 	return err;
@@ -876,9 +709,7 @@ int iscsi_if_destroy_session_done(struct
 	session = iscsi_dev_to_session(conn->dev.parent);
 	shost = iscsi_session_to_shost(session);
 
-	mempool_zone_complete(conn->z_pdu);
-
-	skb = mempool_zone_get_skb(conn->z_pdu);
+	skb = alloc_skb(len, GFP_KERNEL);
 	if (!skb) {
 		dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of "
 			  "session creation event\n");
@@ -896,7 +727,7 @@ int iscsi_if_destroy_session_done(struct
 	 * this will occur if the daemon is not up, so we just warn
 	 * the user and when the daemon is restarted it will handle it
 	 */
-	rc = iscsi_broadcast_skb(conn->z_pdu, skb, GFP_KERNEL);
+	rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
 	if (rc < 0)
 		dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of "
 			  "session destruction event. Check iscsi daemon\n");
@@ -939,9 +770,7 @@ int iscsi_if_create_session_done(struct 
 	session = iscsi_dev_to_session(conn->dev.parent);
 	shost = iscsi_session_to_shost(session);
 
-	mempool_zone_complete(conn->z_pdu);
-
-	skb = mempool_zone_get_skb(conn->z_pdu);
+	skb = alloc_skb(len, GFP_KERNEL);
 	if (!skb) {
 		dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of "
 			  "session creation event\n");
@@ -959,7 +788,7 @@ int iscsi_if_create_session_done(struct 
 	 * this will occur if the daemon is not up, so we just warn
 	 * the user and when the daemon is restarted it will handle it
 	 */
-	rc = iscsi_broadcast_skb(conn->z_pdu, skb, GFP_KERNEL);
+	rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
 	if (rc < 0)
 		dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of "
 			  "session creation event. Check iscsi daemon\n");
@@ -1278,9 +1107,6 @@ iscsi_if_rx(struct sock *sk, int len)
 				err = iscsi_if_send_reply(
 					NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
 					nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
-				if (atomic_read(&z_reply->allocated) >=
-						z_reply->hiwat)
-					ev->iferror = -ENOMEM;
 			} while (err < 0 && err != -ECONNREFUSED);
 			skb_pull(skb, rlen);
 		}
@@ -1584,32 +1410,6 @@ int iscsi_unregister_transport(struct is
 }
 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
 
-static int
-iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
-{
-	struct netlink_notify *n = ptr;
-
-	if (event == NETLINK_URELEASE &&
-	    n->protocol == NETLINK_ISCSI && n->pid) {
-		struct iscsi_cls_conn *conn;
-		unsigned long flags;
-
-		mempool_zone_complete(z_reply);
-		spin_lock_irqsave(&connlock, flags);
-		list_for_each_entry(conn, &connlist, conn_list) {
-			mempool_zone_complete(conn->z_error);
-			mempool_zone_complete(conn->z_pdu);
-		}
-		spin_unlock_irqrestore(&connlock, flags);
-	}
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block iscsi_nl_notifier = {
-	.notifier_call	= iscsi_rcv_nl_event,
-};
-
 static __init int iscsi_transport_init(void)
 {
 	int err;
@@ -1633,25 +1433,15 @@ static __init int iscsi_transport_init(v
 	if (err)
 		goto unregister_conn_class;
 
-	err = netlink_register_notifier(&iscsi_nl_notifier);
-	if (err)
-		goto unregister_session_class;
-
 	nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
 			THIS_MODULE);
 	if (!nls) {
 		err = -ENOBUFS;
-		goto unregister_notifier;
+		goto unregister_session_class;
 	}
 
-	z_reply = mempool_zone_init(Z_MAX_REPLY,
-		NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
-	if (z_reply)
-		return 0;
+	return 0;
 
-	sock_release(nls->sk_socket);
-unregister_notifier:
-	netlink_unregister_notifier(&iscsi_nl_notifier);
 unregister_session_class:
 	transport_class_unregister(&iscsi_session_class);
 unregister_conn_class:
@@ -1665,9 +1455,7 @@ unregister_transport_class:
 
 static void __exit iscsi_transport_exit(void)
 {
-	mempool_zone_destroy(z_reply);
 	sock_release(nls->sk_socket);
-	netlink_unregister_notifier(&iscsi_nl_notifier);
 	transport_class_unregister(&iscsi_connection_class);
 	transport_class_unregister(&iscsi_session_class);
 	transport_class_unregister(&iscsi_host_class);
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 39e8332..4b95c89 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -29,7 +29,6 @@ #include <scsi/iscsi_if.h>
 struct scsi_transport_template;
 struct iscsi_transport;
 struct Scsi_Host;
-struct mempool_zone;
 struct iscsi_cls_conn;
 struct iscsi_conn;
 struct iscsi_cmd_task;
@@ -157,9 +156,6 @@ struct iscsi_cls_conn {
 
 	int active;			/* must be accessed with the connlock */
 	struct device dev;		/* sysfs transport/container device */
-	struct mempool_zone *z_error;
-	struct mempool_zone *z_pdu;
-	struct list_head freequeue;
 };
 
 #define iscsi_dev_to_conn(_dev) \
-- 
1.4.1

[PATCH 2/5] libiscsi: fix oops in connection create failure path

[michaelc]

From: Mike Christie <michaelc@cs.wisc.edu>

If connection creation fails we end up calling list_del
on a invalid struct. This then causes an oops. We are not
acutally using the lists (old MCS code we thought might
be useful elsewhere) so this patch just removes that
code.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
---
 drivers/scsi/libiscsi.c |   38 ++++++++------------------------------
 include/scsi/libiscsi.h |    3 ---
 2 files changed, 8 insertions(+), 33 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index c542d0e..1000fe9 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -778,6 +778,10 @@ int iscsi_queuecommand(struct scsi_cmnd 
 	}
 
 	conn = session->leadconn;
+	if (!conn) {
+		reason = FAILURE_SESSION_FREED;
+		goto fault;
+	}
 
 	if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
 			 sizeof(void*))) {
@@ -1377,7 +1381,6 @@ iscsi_session_setup(struct iscsi_transpo
 	}
 
 	spin_lock_init(&session->lock);
-	INIT_LIST_HEAD(&session->connections);
 
 	/* initialize immediate command pool */
 	if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
@@ -1580,16 +1583,11 @@ void iscsi_conn_teardown(struct iscsi_cl
 	kfree(conn->persistent_address);
 	__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
 		    sizeof(void*));
-	list_del(&conn->item);
-	if (list_empty(&session->connections))
+	if (session->leadconn == conn) {
 		session->leadconn = NULL;
-	if (session->leadconn && session->leadconn == conn)
-		session->leadconn = container_of(session->connections.next,
-			struct iscsi_conn, item);
-
-	if (session->leadconn == NULL)
 		/* no connections exits.. reset sequencing */
 		session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
+	}
 	spin_unlock_bh(&session->lock);
 
 	kfifo_free(conn->immqueue);
@@ -1777,32 +1775,12 @@ int iscsi_conn_bind(struct iscsi_cls_ses
 		    struct iscsi_cls_conn *cls_conn, int is_leading)
 {
 	struct iscsi_session *session = class_to_transport_session(cls_session);
-	struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
+	struct iscsi_conn *conn = cls_conn->dd_data;
 
-	/* lookup for existing connection */
 	spin_lock_bh(&session->lock);
-	list_for_each_entry(tmp, &session->connections, item) {
-		if (tmp == conn) {
-			if (conn->c_stage != ISCSI_CONN_STOPPED ||
-			    conn->stop_stage == STOP_CONN_TERM) {
-				printk(KERN_ERR "iscsi: can't bind "
-				       "non-stopped connection (%d:%d)\n",
-				       conn->c_stage, conn->stop_stage);
-				spin_unlock_bh(&session->lock);
-				return -EIO;
-			}
-			break;
-		}
-	}
-	if (tmp != conn) {
-		/* bind new iSCSI connection to session */
-		conn->session = session;
-		list_add(&conn->item, &session->connections);
-	}
-	spin_unlock_bh(&session->lock);
-
 	if (is_leading)
 		session->leadconn = conn;
+	spin_unlock_bh(&session->lock);
 
 	/*
 	 * Unblock xmitworker(), Login Phase will pass through.
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 401192e..61eebec 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -136,7 +136,6 @@ struct iscsi_conn {
 
 	/* control data */
 	int			id;		/* CID */
-	struct list_head	item;		/* maintains list of conns */
 	int			c_stage;	/* connection state */
 	/*
 	 * Preallocated buffer for pdus that have data but do not
@@ -235,10 +234,8 @@ struct iscsi_session {
 						 * - mgmtpool,		   *
 						 * - r2tpool		   */
 	int			state;		/* session state           */
-	struct list_head	item;
 	int			age;		/* counts session re-opens */
 
-	struct list_head	connections;	/* list of connections */
 	int			cmds_max;	/* size of cmds array */
 	struct iscsi_cmd_task	**cmds;		/* Original Cmds arr */
 	struct iscsi_queue	cmdpool;	/* PDU's pool */
-- 
1.4.1

[PATCH 3/5] libiscsi: fix missed iscsi_task_put in xmit error path

[michaelc]

From: Mike Christie <michaelc@cs.wisc.edu>

from bhalevy@gmail.com:
It looks like change 652 to libiscsi.c added some dead code around line
670
                if (rc) {
                        spin_unlock_bh(&conn->session->lock);
                        goto again;
                }

since 5 lines above we goto again if (rc).

It looks like the previous if (rc) should go away if we want to put the
ctask before
breaking out of the while loop with "goto again" (see following patch).

did I miss anything here?

Benny
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
---
 drivers/scsi/libiscsi.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 1000fe9..e3a2ec2 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -661,8 +661,6 @@ static int iscsi_data_xmit(struct iscsi_
 		spin_unlock_bh(&conn->session->lock);
 
 		rc = tt->xmit_cmd_task(conn, conn->ctask);
-		if (rc)
-			goto again;
 
 		spin_lock_bh(&conn->session->lock);
 		__iscsi_put_ctask(conn->ctask);
-- 
1.4.1

[PATCH 4/5] libiscsi: fix aen support

[michaelc]

From: Mike Christie <michaelc@cs.wisc.edu>

We have been dropping the pdu. We should just send it to userspace
and let it handle it.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
---
 drivers/scsi/libiscsi.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index e3a2ec2..f5a9560 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -481,8 +481,8 @@ int __iscsi_complete_pdu(struct iscsi_co
 			break;
 		case ISCSI_OP_ASYNC_EVENT:
 			conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
-			/* we need sth like iscsi_async_event_rsp() */
-			rc = ISCSI_ERR_BAD_OPCODE;
+			if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
+				rc = ISCSI_ERR_CONN_FAILED;
 			break;
 		default:
 			rc = ISCSI_ERR_BAD_OPCODE;
-- 
1.4.1

[PATCH 5/5] libiscsi: fix logout pdu processing

[michaelc]

From: Mike Christie <michaelc@cs.wisc.edu>

According to the iscsi RFC, we cannot send other requests if
we have sent a logout pdu. This patch enforces this requirement
by blocking the session and suspending the send thread. Userspace
decides if we restart the connection or if we just free everything.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
---
 drivers/scsi/libiscsi.c |   25 +++++++++++++++++++++++--
 1 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index f5a9560..2865ebd 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -578,6 +578,27 @@ void iscsi_conn_failure(struct iscsi_con
 }
 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
 
+static int iscsi_xmit_imm_task(struct iscsi_conn *conn)
+{
+	struct iscsi_hdr *hdr = conn->mtask->hdr;
+	int rc, was_logout = 0;
+
+	if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
+		conn->session->state = ISCSI_STATE_IN_RECOVERY;
+		iscsi_block_session(session_to_cls(conn->session));
+		was_logout = 1;
+	}
+	rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
+	if (rc)
+		return rc;
+
+	if (was_logout) {
+		set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+		return -ENODATA;
+	}
+	return 0;
+}
+
 /**
  * iscsi_data_xmit - xmit any command into the scheduled connection
  * @conn: iscsi connection
@@ -623,7 +644,7 @@ static int iscsi_data_xmit(struct iscsi_
 		conn->ctask = NULL;
 	}
 	if (conn->mtask) {
-		rc = tt->xmit_mgmt_task(conn, conn->mtask);
+		rc = iscsi_xmit_imm_task(conn);
 	        if (rc)
 		        goto again;
 		/* done with this in-progress mtask */
@@ -638,7 +659,7 @@ static int iscsi_data_xmit(struct iscsi_
 			list_add_tail(&conn->mtask->running,
 				      &conn->mgmt_run_list);
 			spin_unlock_bh(&conn->session->lock);
-			rc = tt->xmit_mgmt_task(conn, conn->mtask);
+			rc = iscsi_xmit_imm_task(conn);
 		        if (rc)
 			        goto again;
 	        }
-- 
1.4.1