Do not send junk in bcc area of oplock break SMB Lock request, and always let oplock break release

through even if requests are ahead of it waiting for responses to complete.

Signed-off-by: Steve French (sfrench@us.ibm.com)

fs/cifs/CHANGES

 Version 1.19
 ------------
 Fix /proc/fs/cifs/Stats and DebugData display to handle larger
-amounts of return data.
+amounts of return data. Properly limit requests to MAX_REQ (50
+is the usual maximum active multiplex SMB/CIFS requests per server).
 
 
 Version 1.18

fs/cifs/cifssmb.c

@@ -819,14 +819,20 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 	pSMB->AndXCommand = 0xFF;	/* none */
 	pSMB->Fid = smb_file_id; /* netfid stays le */
 
-	pSMB->Locks[0].Pid = cpu_to_le16(current->tgid);
-	temp = cpu_to_le64(len);
-	pSMB->Locks[0].LengthLow = (__u32)(len & 0xFFFFFFFF);
-	pSMB->Locks[0].LengthHigh =  (__u32)(len>>32);
-	temp = cpu_to_le64(offset);
-	pSMB->Locks[0].OffsetLow = (__u32)(offset & 0xFFFFFFFF);
-	pSMB->Locks[0].OffsetHigh = (__u32)(offset>>32);
-	pSMB->ByteCount = sizeof (LOCKING_ANDX_RANGE);
+	if(numLock != 0) {
+		pSMB->Locks[0].Pid = cpu_to_le16(current->tgid);
+		/* BB where to store pid high? */
+		temp = cpu_to_le64(len);
+		pSMB->Locks[0].LengthLow = (__u32)(temp & 0xFFFFFFFF);
+		pSMB->Locks[0].LengthHigh =  (__u32)(temp>>32);
+		temp = cpu_to_le64(offset);
+		pSMB->Locks[0].OffsetLow = (__u32)(temp & 0xFFFFFFFF);
+		pSMB->Locks[0].OffsetHigh = (__u32)(temp>>32);
+		pSMB->ByteCount = sizeof (LOCKING_ANDX_RANGE);
+	} else {
+		/* oplock break */
+		pSMB->ByteCount = 0;
+	}
 	pSMB->hdr.smb_buf_length += pSMB->ByteCount;
 	pSMB->ByteCount = cpu_to_le16(pSMB->ByteCount);
 

fs/cifs/connect.c

@@ -175,7 +175,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
 			if(server->tcpStatus != CifsExiting)
 				server->tcpStatus = CifsGood;
 			spin_unlock(&GlobalMid_Lock);
-			atomic_set(&server->inFlight,0);
+	/*		atomic_set(&server->inFlight,0);*/
 			wake_up(&server->response_q);
 		}
 	}

fs/cifs/transport.c

@@ -202,25 +202,30 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 	/* Ensure that we do not send more than 50 overlapping requests 
 	   to the same server. We may make this configurable later or
 	   use ses->maxReq */
-
-	spin_lock(&GlobalMid_Lock); 
-	while(1) {        
-		if(atomic_read(&ses->server->inFlight) >= CIFS_MAX_REQ) {
-			spin_unlock(&GlobalMid_Lock);         
-			wait_event(ses->server->request_q,atomic_read(&ses->server->inFlight) < CIFS_MAX_REQ);
-			spin_lock(&GlobalMid_Lock); 
-		} else {
-			/* can not count locking commands against the total since
+	if(long_op == -1) {
+		/* oplock breaks must not be held up */
+		atomic_inc(&ses->server->inFlight);
+	} else {
+		spin_lock(&GlobalMid_Lock); 
+		while(1) {        
+			if(atomic_read(&ses->server->inFlight) >= CIFS_MAX_REQ){
+				spin_unlock(&GlobalMid_Lock);
+				wait_event(ses->server->request_q,
+					atomic_read(&ses->server->inFlight)
+					 < CIFS_MAX_REQ);
+				spin_lock(&GlobalMid_Lock);
+			} else {
+			/* can not count locking commands against total since
 			   they are allowed to block on server */
-			if(long_op < 3) {
-				/* update # of requests on the wire to this server */
-				atomic_inc(&ses->server->inFlight); 
+				if(long_op < 3) {
+				/* update # of requests on the wire to server */
+					atomic_inc(&ses->server->inFlight);
+				}
+				spin_unlock(&GlobalMid_Lock);
+				break;
 			}
-			spin_unlock(&GlobalMid_Lock); 
-			break;
 		}
 	}
-
 	/* make sure that we sign in the same order that we send on this socket 
 	   and avoid races inside tcp sendmsg code that could cause corruption
 	   of smb data */