[SCSI] libiscsi, iser, tcp: remove recv_lock
The recv lock was defined so the iscsi layer could block
the recv path from processing IO during recovery. It
turns out iser just set a lock to that pointer which was pointless.
We now disconnect the transport connection before doing recovery
so we do not need the recv lock. For iscsi_tcp we still stop
the recv path incase older tools are being used.
This patch also has iscsi_itt_to_ctask user grab the session lock
and has the caller access the task with the lock or get a ref
to it in case the target is broken and sends a tmf success response
then sends data or a response for the command that was supposed to
be affected bty the tmf.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 7552dd8..91cb1fd 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -741,7 +741,6 @@
iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
{
int rc = 0, opcode, ahslen;
- struct iscsi_session *session = conn->session;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct iscsi_task *task;
@@ -770,17 +769,17 @@
switch(opcode) {
case ISCSI_OP_SCSI_DATA_IN:
+ spin_lock(&conn->session->lock);
task = iscsi_itt_to_ctask(conn, hdr->itt);
if (!task)
- return ISCSI_ERR_BAD_ITT;
- if (!task->sc)
- return ISCSI_ERR_NO_SCSI_CMD;
+ rc = ISCSI_ERR_BAD_ITT;
+ else
+ rc = iscsi_data_rsp(conn, task);
+ if (rc) {
+ spin_unlock(&conn->session->lock);
+ break;
+ }
- spin_lock(&conn->session->lock);
- rc = iscsi_data_rsp(conn, task);
- spin_unlock(&conn->session->lock);
- if (rc)
- return rc;
if (tcp_conn->in.datalen) {
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct hash_desc *rx_hash = NULL;
@@ -801,15 +800,19 @@
"datalen=%d)\n", tcp_conn,
tcp_task->data_offset,
tcp_conn->in.datalen);
- return iscsi_segment_seek_sg(&tcp_conn->in.segment,
- sdb->table.sgl,
- sdb->table.nents,
- tcp_task->data_offset,
- tcp_conn->in.datalen,
- iscsi_tcp_process_data_in,
- rx_hash);
+ rc = iscsi_segment_seek_sg(&tcp_conn->in.segment,
+ sdb->table.sgl,
+ sdb->table.nents,
+ tcp_task->data_offset,
+ tcp_conn->in.datalen,
+ iscsi_tcp_process_data_in,
+ rx_hash);
+ spin_unlock(&conn->session->lock);
+ return rc;
}
- /* fall through */
+ rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
+ spin_unlock(&conn->session->lock);
+ break;
case ISCSI_OP_SCSI_CMD_RSP:
if (tcp_conn->in.datalen) {
iscsi_tcp_data_recv_prep(tcp_conn);
@@ -818,20 +821,17 @@
rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
break;
case ISCSI_OP_R2T:
+ spin_lock(&conn->session->lock);
task = iscsi_itt_to_ctask(conn, hdr->itt);
if (!task)
- return ISCSI_ERR_BAD_ITT;
- if (!task->sc)
- return ISCSI_ERR_NO_SCSI_CMD;
-
- if (ahslen)
+ rc = ISCSI_ERR_BAD_ITT;
+ else if (ahslen)
rc = ISCSI_ERR_AHSLEN;
- else if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
- spin_lock(&session->lock);
+ else if (task->sc->sc_data_direction == DMA_TO_DEVICE)
rc = iscsi_r2t_rsp(conn, task);
- spin_unlock(&session->lock);
- } else
+ else
rc = ISCSI_ERR_PROTO;
+ spin_unlock(&conn->session->lock);
break;
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_TEXT_RSP:
@@ -1553,7 +1553,6 @@
spin_lock_bh(&session->lock);
tcp_conn->sock = NULL;
- conn->recv_lock = NULL;
spin_unlock_bh(&session->lock);
sockfd_put(sock);
}
@@ -1578,6 +1577,19 @@
iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{
struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+
+ /* userspace may have goofed up and not bound us */
+ if (!tcp_conn->sock)
+ return;
+ /*
+ * Make sure our recv side is stopped.
+ * Older tools called conn stop before ep_disconnect
+ * so IO could still be coming in.
+ */
+ write_lock_bh(&tcp_conn->sock->sk->sk_callback_lock);
+ set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
+ write_unlock_bh(&tcp_conn->sock->sk->sk_callback_lock);
iscsi_conn_stop(cls_conn, flag);
iscsi_tcp_release_conn(conn);
@@ -1671,13 +1683,6 @@
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
sk->sk_allocation = GFP_ATOMIC;
- /* FIXME: disable Nagle's algorithm */
-
- /*
- * Intercept TCP callbacks for sendfile like receive
- * processing.
- */
- conn->recv_lock = &sk->sk_callback_lock;
iscsi_conn_set_callbacks(conn);
tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
/*