[CIFS] spinlock protect read of last srv response time in timeout path

Signed-off-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
(cherry picked from b33a3f55e54fd210fc043eafcf83728b03bc9e02 commit)

1 files changed, 76 insertions, 23 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 95e23ca670a8..d16e6032d4cf 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -3,7 +3,8 @@
  *
  *   Copyright (C) International Business Machines  Corp., 2002,2005
  *   Author(s): Steve French (sfrench@us.ibm.com)
- *
+ *   Jeremy Allison (jra@samba.org) 2006.
+ *    
  *   This library is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU Lesser General Public License as published
  *   by the Free Software Foundation; either version 2.1 of the License, or
@@ -442,13 +443,46 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 
         /* No user interrupts in wait - wreaks havoc with performance */
         if(timeout != MAX_SCHEDULE_TIMEOUT) {
-                timeout += jiffies;
-                wait_event(ses->server->response_q,
-                        (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
-                        (time_after(jiffies, timeout) &&
-                                time_after(jiffies, ses->server->lstrp + HZ)) ||
-                        ((ses->server->tcpStatus != CifsGood) &&
-                         (ses->server->tcpStatus != CifsNew)));
+                unsigned long curr_timeout;
+
+                for (;;) {
+                        curr_timeout = timeout + jiffies;
+                        wait_event(ses->server->response_q,
+                                (!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
+                                time_after(jiffies, curr_timeout) || 
+                                ((ses->server->tcpStatus != CifsGood) &&
+                                 (ses->server->tcpStatus != CifsNew)));
+
+                        if (time_after(jiffies, curr_timeout) &&
+                                (midQ->midState & MID_REQUEST_SUBMITTED) &&
+                                ((ses->server->tcpStatus == CifsGood) ||
+                                 (ses->server->tcpStatus == CifsNew))) {
+
+                                unsigned long lrt;
+
+                                /* We timed out. Is the server still
+                                   sending replies ? */
+                                spin_lock(&GlobalMid_Lock);
+                                lrt = ses->server->lstrp;
+                                spin_unlock(&GlobalMid_Lock);
+
+                                /* Calculate 10 seconds past last receive time.
+                                Although we prefer not to time out if the 
+                                server is still responding - we will time
+                                out if the server takes more than 15 (or 45 
+                                or 180) seconds to respond to this request
+                                and has not responded to any request from 
+                                other threads on the client within 10 seconds */
+                                lrt += (10 * HZ);
+                                if (time_after(jiffies, lrt)) {
+                                        /* No replies for 10 seconds. */
+                                        cERROR(1,("server not responding"));
+                                        break;
+                                }
+                        } else {
+                                break;
+                        }
+                }
         } else {
                 wait_event(ses->server->response_q,
                         (!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
@@ -710,21 +744,40 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 
         /* No user interrupts in wait - wreaks havoc with performance */
         if(timeout != MAX_SCHEDULE_TIMEOUT) {
-                timeout += jiffies;
-                /* although we prefer not to time out if the server is still
-                responding - we will time out if the server takes
-                more than 15 (or 45 or 180) seconds to respond to this request
-                and has not responded to any request from other threads
-                on this client within a second (note that it is not worth
-                grabbing the GlobalMid_Lock and slowing things down in this
-                wait event to more accurately check the lstrsp field on some 
-                arch since we are already in an error path that will retry */
-                wait_event(ses->server->response_q,
-                        (!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
-                        (time_after(jiffies, timeout) &&
-                                time_after(jiffies, ses->server->lstrp + HZ)) ||
-                        ((ses->server->tcpStatus != CifsGood) &&
-                         (ses->server->tcpStatus != CifsNew)));
+                unsigned long curr_timeout;
+
+                for (;;) {
+                        curr_timeout = timeout + jiffies;
+                        wait_event(ses->server->response_q,
+                                (!(midQ->midState & MID_REQUEST_SUBMITTED)) || 
+                                time_after(jiffies, curr_timeout) || 
+                                ((ses->server->tcpStatus != CifsGood) &&
+                                 (ses->server->tcpStatus != CifsNew)));
+
+                        if (time_after(jiffies, curr_timeout) &&
+                                (midQ->midState & MID_REQUEST_SUBMITTED) &&
+                                ((ses->server->tcpStatus == CifsGood) ||
+                                 (ses->server->tcpStatus == CifsNew))) {
+
+                                unsigned long lrt;
+
+                                /* We timed out. Is the server still
+                                   sending replies ? */
+                                spin_lock(&GlobalMid_Lock);
+                                lrt = ses->server->lstrp;
+                                spin_unlock(&GlobalMid_Lock);
+
+                                /* Calculate 10 seconds past last receive time*/
+                                lrt += (10 * HZ);
+                                if (time_after(jiffies, lrt)) {
+                                        /* Server sent no reply in 10 seconds */
+                                        cERROR(1,("Server not responding"));
+                                        break;
+                                }
+                        } else {
+                                break;
+                        }
+                }
         } else {
                 wait_event(ses->server->response_q,
                         (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||