cifs: add a timeout argument to wait_for_free_credits

A negative timeout is the same as the current behaviour, i.e. no timeout.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 9e08ce7..b3d0401 100644 (file)
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -487,11 +487,18 @@ smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
 
 static int
 wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
-                     const int flags, unsigned int *instance)
+                     const int timeout, const int flags,
+                     unsigned int *instance)
 {
        int rc;
        int *credits;
        int optype;
+       long int t;
+
+       if (timeout < 0)
+               t = MAX_JIFFY_OFFSET;
+       else
+               t = msecs_to_jiffies(timeout);
 
        optype = flags & CIFS_OP_MASK;
 
@@ -516,11 +523,16 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
                if (*credits < num_credits) {
                        spin_unlock(&server->req_lock);
                        cifs_num_waiters_inc(server);
-                       rc = wait_event_killable(server->request_q,
-                               has_credits(server, credits, num_credits));
+                       rc = wait_event_killable_timeout(server->request_q,
+                               has_credits(server, credits, num_credits), t);
                        cifs_num_waiters_dec(server);
-                       if (rc)
-                               return rc;
+                       if (!rc) {
+                               cifs_dbg(VFS, "wait timed out after %d ms\n",
+                                        timeout);
+                               return -ENOTSUPP;
+                       }
+                       if (rc == -ERESTARTSYS)
+                               return -ERESTARTSYS;
                        spin_lock(&server->req_lock);
                } else {
                        if (server->tcpStatus == CifsExiting) {
@@ -546,12 +558,19 @@ wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits,
                            *credits <= MAX_COMPOUND) {
                                spin_unlock(&server->req_lock);
                                cifs_num_waiters_inc(server);
-                               rc = wait_event_killable(server->request_q,
+                               rc = wait_event_killable_timeout(
+                                       server->request_q,
                                        has_credits(server, credits,
-                                                   MAX_COMPOUND + 1));
+                                                   MAX_COMPOUND + 1),
+                                       t);
                                cifs_num_waiters_dec(server);
-                               if (rc)
-                                       return rc;
+                               if (!rc) {
+                                       cifs_dbg(VFS, "wait timed out after %d ms\n",
+                                                timeout);
+                                       return -ENOTSUPP;
+                               }
+                               if (rc == -ERESTARTSYS)
+                                       return -ERESTARTSYS;
                                spin_lock(&server->req_lock);
                                continue;
                        }
@@ -578,7 +597,8 @@ static int
 wait_for_free_request(struct TCP_Server_Info *server, const int flags,
                      unsigned int *instance)
 {
-       return wait_for_free_credits(server, 1, flags, instance);
+       return wait_for_free_credits(server, 1, -1, flags,
+                                    instance);
 }
 
 int