[PATCH v2 7/9] smb: client: use status_wait and SMBDIRECT_SOCKET_RESOLVE_{ADDR,ROUTE}_RUNNING for completion

[Stefan Metzmacher <metze@samba.org>]

We can use the state change from
SMBDIRECT_SOCKET_RESOLVE_{ADDR,ROUTE}_RUNNING
to the next state in order to wake the caller to do the next step.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
 fs/smb/client/smbdirect.c | 49 ++++++++++++++++++++++-----------------
 fs/smb/client/smbdirect.h |  2 --
 2 files changed, 28 insertions(+), 23 deletions(-)

diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c
index 2057dae51e7b..6e0ef7ca8ab8 100644
--- a/fs/smb/client/smbdirect.c
+++ b/fs/smb/client/smbdirect.c
@@ -187,31 +187,27 @@ static int smbd_conn_upcall(
 	case RDMA_CM_EVENT_ADDR_RESOLVED:
 		WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RESOLVE_ADDR_RUNNING);
 		sc->status = SMBDIRECT_SOCKET_RESOLVE_ROUTE_NEEDED;
-		info->ri_rc = 0;
-		complete(&info->ri_done);
+		wake_up_interruptible(&info->status_wait);
 		break;
 
 	case RDMA_CM_EVENT_ROUTE_RESOLVED:
 		WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RESOLVE_ROUTE_RUNNING);
 		sc->status = SMBDIRECT_SOCKET_RDMA_CONNECT_NEEDED;
-		info->ri_rc = 0;
-		complete(&info->ri_done);
+		wake_up_interruptible(&info->status_wait);
 		break;
 
 	case RDMA_CM_EVENT_ADDR_ERROR:
 		log_rdma_event(ERR, "connecting failed event=%s\n", event_name);
 		WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RESOLVE_ADDR_RUNNING);
 		sc->status = SMBDIRECT_SOCKET_RESOLVE_ADDR_FAILED;
-		info->ri_rc = -EHOSTUNREACH;
-		complete(&info->ri_done);
+		wake_up_interruptible(&info->status_wait);
 		break;
 
 	case RDMA_CM_EVENT_ROUTE_ERROR:
 		log_rdma_event(ERR, "connecting failed event=%s\n", event_name);
 		WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RESOLVE_ROUTE_RUNNING);
 		sc->status = SMBDIRECT_SOCKET_RESOLVE_ROUTE_FAILED;
-		info->ri_rc = -ENETUNREACH;
-		complete(&info->ri_done);
+		wake_up_interruptible(&info->status_wait);
 		break;
 
 	case RDMA_CM_EVENT_ESTABLISHED:
@@ -597,9 +593,6 @@ static struct rdma_cm_id *smbd_create_id(
 
 	*sport = htons(port);
 
-	init_completion(&info->ri_done);
-	info->ri_rc = -ETIMEDOUT;
-
 	WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RESOLVE_ADDR_NEEDED);
 	sc->status = SMBDIRECT_SOCKET_RESOLVE_ADDR_RUNNING;
 	rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)dstaddr,
@@ -608,20 +601,26 @@ static struct rdma_cm_id *smbd_create_id(
 		log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc);
 		goto out;
 	}
-	rc = wait_for_completion_interruptible_timeout(
-		&info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
+	rc = wait_event_interruptible_timeout(
+		info->status_wait,
+		sc->status != SMBDIRECT_SOCKET_RESOLVE_ADDR_RUNNING,
+		msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
 	/* e.g. if interrupted returns -ERESTARTSYS */
 	if (rc < 0) {
 		log_rdma_event(ERR, "rdma_resolve_addr timeout rc: %i\n", rc);
 		goto out;
 	}
-	rc = info->ri_rc;
-	if (rc) {
+	if (sc->status == SMBDIRECT_SOCKET_RESOLVE_ADDR_RUNNING) {
+		rc = -ETIMEDOUT;
+		log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc);
+		goto out;
+	}
+	if (sc->status != SMBDIRECT_SOCKET_RESOLVE_ROUTE_NEEDED) {
+		rc = -EHOSTUNREACH;
 		log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc);
 		goto out;
 	}
 
-	info->ri_rc = -ETIMEDOUT;
 	WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RESOLVE_ROUTE_NEEDED);
 	sc->status = SMBDIRECT_SOCKET_RESOLVE_ROUTE_RUNNING;
 	rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
@@ -629,15 +628,22 @@ static struct rdma_cm_id *smbd_create_id(
 		log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc);
 		goto out;
 	}
-	rc = wait_for_completion_interruptible_timeout(
-		&info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
+	rc = wait_event_interruptible_timeout(
+		info->status_wait,
+		sc->status != SMBDIRECT_SOCKET_RESOLVE_ROUTE_RUNNING,
+		msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
 	/* e.g. if interrupted returns -ERESTARTSYS */
 	if (rc < 0)  {
 		log_rdma_event(ERR, "rdma_resolve_addr timeout rc: %i\n", rc);
 		goto out;
 	}
-	rc = info->ri_rc;
-	if (rc) {
+	if (sc->status == SMBDIRECT_SOCKET_RESOLVE_ROUTE_RUNNING) {
+		rc = -ETIMEDOUT;
+		log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc);
+		goto out;
+	}
+	if (sc->status != SMBDIRECT_SOCKET_RDMA_CONNECT_NEEDED) {
+		rc = -ENETUNREACH;
 		log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc);
 		goto out;
 	}
@@ -1572,6 +1578,8 @@ static struct smbd_connection *_smbd_get_connection(
 	sc = &info->socket;
 	sp = &sc->parameters;
 
+	init_waitqueue_head(&info->status_wait);
+
 	sc->status = SMBDIRECT_SOCKET_CREATED;
 	rc = smbd_ia_open(info, dstaddr, port);
 	if (rc) {
@@ -1682,7 +1690,6 @@ static struct smbd_connection *_smbd_get_connection(
 	log_rdma_event(INFO, "connecting to IP %pI4 port %d\n",
 		&addr_in->sin_addr, port);
 
-	init_waitqueue_head(&info->status_wait);
 	init_waitqueue_head(&sc->recv_io.reassembly.wait_queue);
 
 	WARN_ON_ONCE(sc->status != SMBDIRECT_SOCKET_RDMA_CONNECT_NEEDED);
diff --git a/fs/smb/client/smbdirect.h b/fs/smb/client/smbdirect.h
index 82505df4a751..62458a8fd109 100644
--- a/fs/smb/client/smbdirect.h
+++ b/fs/smb/client/smbdirect.h
@@ -45,8 +45,6 @@ enum keep_alive_status {
 struct smbd_connection {
 	struct smbdirect_socket socket;
 
-	int ri_rc;
-	struct completion ri_done;
 	wait_queue_head_t status_wait;
 
 	struct work_struct disconnect_work;
-- 
2.43.0