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From: Long Li <longli@linuxonhyperv.com>
To: Steve French <sfrench@samba.org>,
	linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
	linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org
Cc: Long Li <longli@microsoft.com>
Subject: [PATCH 7/7] cifs: Call MID callback before destroying transport
Date: Mon,  7 May 2018 15:20:06 -0700	[thread overview]
Message-ID: <20180507222006.20781-7-longli@linuxonhyperv.com> (raw)
In-Reply-To: <20180507222006.20781-1-longli@linuxonhyperv.com>

From: Long Li <longli@microsoft.com>

When transport is being destroyed, it's possible that some processes may
hold memory registrations that need to be deregistred.

Call them first so nobody is using transport resources, and it can be
destroyed.

Signed-off-by: Long Li <longli@microsoft.com>
---
 fs/cifs/connect.c | 36 +++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5db3e9d..7e7d40e 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -369,22 +369,6 @@ cifs_reconnect(struct TCP_Server_Info *server)
 	/* do not want to be sending data on a socket we are freeing */
 	cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
 	mutex_lock(&server->srv_mutex);
-	if (server->ssocket) {
-		cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
-			 server->ssocket->state, server->ssocket->flags);
-		kernel_sock_shutdown(server->ssocket, SHUT_WR);
-		cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
-			 server->ssocket->state, server->ssocket->flags);
-		sock_release(server->ssocket);
-		server->ssocket = NULL;
-	} else if (cifs_rdma_enabled(server))
-		smbd_destroy(server);
-	server->sequence_number = 0;
-	server->session_estab = false;
-	kfree(server->session_key.response);
-	server->session_key.response = NULL;
-	server->session_key.len = 0;
-	server->lstrp = jiffies;
 
 	/* mark submitted MIDs for retry and issue callback */
 	INIT_LIST_HEAD(&retry_list);
@@ -397,7 +381,6 @@ cifs_reconnect(struct TCP_Server_Info *server)
 		list_move(&mid_entry->qhead, &retry_list);
 	}
 	spin_unlock(&GlobalMid_Lock);
-	mutex_unlock(&server->srv_mutex);
 
 	cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
 	list_for_each_safe(tmp, tmp2, &retry_list) {
@@ -406,6 +389,25 @@ cifs_reconnect(struct TCP_Server_Info *server)
 		mid_entry->callback(mid_entry);
 	}
 
+	if (server->ssocket) {
+		cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
+			 server->ssocket->state, server->ssocket->flags);
+		kernel_sock_shutdown(server->ssocket, SHUT_WR);
+		cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
+			 server->ssocket->state, server->ssocket->flags);
+		sock_release(server->ssocket);
+		server->ssocket = NULL;
+	} else if (cifs_rdma_enabled(server))
+		smbd_destroy(server);
+	server->sequence_number = 0;
+	server->session_estab = false;
+	kfree(server->session_key.response);
+	server->session_key.response = NULL;
+	server->session_key.len = 0;
+	server->lstrp = jiffies;
+
+	mutex_unlock(&server->srv_mutex);
+
 	do {
 		try_to_freeze();
 
-- 
2.7.4

  parent reply	other threads:[~2018-05-07 22:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-07 22:20 [PATCH 1/7] cifs: smbd: Make upper layer decide when to destroy the transport Long Li
2018-05-07 22:20 ` [PATCH 2/7] cifs: smbd: Don't destroy transport on RDMA disconnect Long Li
2018-05-07 22:20 ` [PATCH 3/7] cifs: smbd: Return EINTR when interrupted Long Li
2018-05-07 22:20 ` [PATCH 4/7] cifs: smbd: Indicate to retry on transport sending failure Long Li
2018-05-07 22:20 ` [PATCH 5/7] cifs: smbd: Protect memory registration using RCU Long Li
2018-05-08  6:35   ` kbuild test robot
2018-05-08 22:16     ` Long Li
2018-05-07 22:20 ` [PATCH 6/7] cifs: smbd: Retry on memory registration failure Long Li
2018-05-07 22:20 ` Long Li [this message]
2018-05-08  3:45 ` [PATCH 1/7] cifs: smbd: Make upper layer decide when to destroy the transport kbuild test robot
2018-05-08  5:24 ` kbuild test robot
2018-05-08 19:29   ` Long Li

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