1 files changed, 206 insertions, 228 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 59ca81b1691..c1ccca1a933 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -36,7 +36,13 @@
 
 extern mempool_t *cifs_mid_poolp;
 
-static struct mid_q_entry *
+static void
+wake_up_task(struct mid_q_entry *mid)
+{
+        wake_up_process(mid->callback_data);
+}
+
+struct mid_q_entry *
 AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
 {
         struct mid_q_entry *temp;
@@ -58,28 +64,28 @@ AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
         /*      do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
                 /* when mid allocated can be before when sent */
                 temp->when_alloc = jiffies;
-                temp->tsk = current;
+
+                /*
+                 * The default is for the mid to be synchronous, so the
+                 * default callback just wakes up the current task.
+                 */
+                temp->callback = wake_up_task;
+                temp->callback_data = current;
         }
 
-        spin_lock(&GlobalMid_Lock);
-        list_add_tail(&temp->qhead, &server->pending_mid_q);
         atomic_inc(&midCount);
         temp->midState = MID_REQUEST_ALLOCATED;
-        spin_unlock(&GlobalMid_Lock);
         return temp;
 }
 
-static void
+void
 DeleteMidQEntry(struct mid_q_entry *midEntry)
 {
 #ifdef CONFIG_CIFS_STATS2
         unsigned long now;
 #endif
-        spin_lock(&GlobalMid_Lock);
         midEntry->midState = MID_FREE;
-        list_del(&midEntry->qhead);
         atomic_dec(&midCount);
-        spin_unlock(&GlobalMid_Lock);
         if (midEntry->largeBuf)
                 cifs_buf_release(midEntry->resp_buf);
         else
@@ -103,6 +109,16 @@ DeleteMidQEntry(struct mid_q_entry *midEntry)
         mempool_free(midEntry, cifs_mid_poolp);
 }
 
+static void
+delete_mid(struct mid_q_entry *mid)
+{
+        spin_lock(&GlobalMid_Lock);
+        list_del(&mid->qhead);
+        spin_unlock(&GlobalMid_Lock);
+
+        DeleteMidQEntry(mid);
+}
+
 static int
 smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
 {
@@ -244,31 +260,31 @@ smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
         return smb_sendv(server, &iov, 1);
 }
 
-static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op)
+static int wait_for_free_request(struct TCP_Server_Info *server,
+                                 const int long_op)
 {
         if (long_op == CIFS_ASYNC_OP) {
                 /* oplock breaks must not be held up */
-                atomic_inc(&ses->server->inFlight);
+                atomic_inc(&server->inFlight);
                 return 0;
         }
 
         spin_lock(&GlobalMid_Lock);
         while (1) {
-                if (atomic_read(&ses->server->inFlight) >=
-                                cifs_max_pending){
+                if (atomic_read(&server->inFlight) >= cifs_max_pending) {
                         spin_unlock(&GlobalMid_Lock);
 #ifdef CONFIG_CIFS_STATS2
-                        atomic_inc(&ses->server->num_waiters);
+                        atomic_inc(&server->num_waiters);
 #endif
-                        wait_event(ses->server->request_q,
-                                   atomic_read(&ses->server->inFlight)
+                        wait_event(server->request_q,
+                                   atomic_read(&server->inFlight)
                                      < cifs_max_pending);
 #ifdef CONFIG_CIFS_STATS2
-                        atomic_dec(&ses->server->num_waiters);
+                        atomic_dec(&server->num_waiters);
 #endif
                         spin_lock(&GlobalMid_Lock);
                 } else {
-                        if (ses->server->tcpStatus == CifsExiting) {
+                        if (server->tcpStatus == CifsExiting) {
                                 spin_unlock(&GlobalMid_Lock);
                                 return -ENOENT;
                         }
@@ -278,7 +294,7 @@ static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op)
 
                         /* update # of requests on the wire to server */
                         if (long_op != CIFS_BLOCKING_OP)
-                                atomic_inc(&ses->server->inFlight);
+                                atomic_inc(&server->inFlight);
                         spin_unlock(&GlobalMid_Lock);
                         break;
                 }
@@ -308,53 +324,81 @@ static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf,
         *ppmidQ = AllocMidQEntry(in_buf, ses->server);
         if (*ppmidQ == NULL)
                 return -ENOMEM;
+        spin_lock(&GlobalMid_Lock);
+        list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
+        spin_unlock(&GlobalMid_Lock);
         return 0;
 }
 
-static int wait_for_response(struct cifsSesInfo *ses,
-                        struct mid_q_entry *midQ,
-                        unsigned long timeout,
-                        unsigned long time_to_wait)
+static int
+wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
 {
-        unsigned long curr_timeout;
+        int error;
 
-        for (;;) {
-                curr_timeout = timeout + jiffies;
-                wait_event_timeout(ses->server->response_q,
-                        midQ->midState != MID_REQUEST_SUBMITTED, timeout);
+        error = wait_event_killable(server->response_q,
+                                    midQ->midState != MID_REQUEST_SUBMITTED);
+        if (error < 0)
+                return -ERESTARTSYS;
 
-                if (time_after(jiffies, curr_timeout) &&
-                        (midQ->midState == MID_REQUEST_SUBMITTED) &&
-                        ((ses->server->tcpStatus == CifsGood) ||
-                         (ses->server->tcpStatus == CifsNew))) {
+        return 0;
+}
 
-                        unsigned long lrt;
 
-                        /* We timed out. Is the server still
-                           sending replies ? */
-                        spin_lock(&GlobalMid_Lock);
-                        lrt = ses->server->lstrp;
-                        spin_unlock(&GlobalMid_Lock);
+/*
+ * Send a SMB request and set the callback function in the mid to handle
+ * the result. Caller is responsible for dealing with timeouts.
+ */
+int
+cifs_call_async(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
+                mid_callback_t *callback, void *cbdata)
+{
+        int rc;
+        struct mid_q_entry *mid;
 
-                        /* Calculate time_to_wait 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 += time_to_wait;
-                        if (time_after(jiffies, lrt)) {
-                                /* No replies for time_to_wait. */
-                                cERROR(1, "server not responding");
-                                return -1;
-                        }
-                } else {
-                        return 0;
-                }
+        rc = wait_for_free_request(server, CIFS_ASYNC_OP);
+        if (rc)
+                return rc;
+
+        mutex_lock(&server->srv_mutex);
+        mid = AllocMidQEntry(in_buf, server);
+        if (mid == NULL) {
+                mutex_unlock(&server->srv_mutex);
+                return -ENOMEM;
         }
-}
 
+        /* put it on the pending_mid_q */
+        spin_lock(&GlobalMid_Lock);
+        list_add_tail(&mid->qhead, &server->pending_mid_q);
+        spin_unlock(&GlobalMid_Lock);
+
+        rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
+        if (rc) {
+                mutex_unlock(&server->srv_mutex);
+                goto out_err;
+        }
+
+        mid->callback = callback;
+        mid->callback_data = cbdata;
+        mid->midState = MID_REQUEST_SUBMITTED;
+#ifdef CONFIG_CIFS_STATS2
+        atomic_inc(&server->inSend);
+#endif
+        rc = smb_send(server, in_buf, in_buf->smb_buf_length);
+#ifdef CONFIG_CIFS_STATS2
+        atomic_dec(&server->inSend);
+        mid->when_sent = jiffies;
+#endif
+        mutex_unlock(&server->srv_mutex);
+        if (rc)
+                goto out_err;
+
+        return rc;
+out_err:
+        delete_mid(mid);
+        atomic_dec(&server->inFlight);
+        wake_up(&server->request_q);
+        return rc;
+}
 
 /*
  *
@@ -382,6 +426,81 @@ SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
         return rc;
 }
 
+static int
+sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
+{
+        int rc = 0;
+
+        cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command,
+                mid->mid, mid->midState);
+
+        spin_lock(&GlobalMid_Lock);
+        /* ensure that it's no longer on the pending_mid_q */
+        list_del_init(&mid->qhead);
+
+        switch (mid->midState) {
+        case MID_RESPONSE_RECEIVED:
+                spin_unlock(&GlobalMid_Lock);
+                return rc;
+        case MID_REQUEST_SUBMITTED:
+                /* socket is going down, reject all calls */
+                if (server->tcpStatus == CifsExiting) {
+                        cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d",
+                               __func__, mid->mid, mid->command, mid->midState);
+                        rc = -EHOSTDOWN;
+                        break;
+                }
+        case MID_RETRY_NEEDED:
+                rc = -EAGAIN;
+                break;
+        default:
+                cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__,
+                        mid->mid, mid->midState);
+                rc = -EIO;
+        }
+        spin_unlock(&GlobalMid_Lock);
+
+        DeleteMidQEntry(mid);
+        return rc;
+}
+
+/*
+ * An NT cancel request header looks just like the original request except:
+ *
+ * The Command is SMB_COM_NT_CANCEL
+ * The WordCount is zeroed out
+ * The ByteCount is zeroed out
+ *
+ * This function mangles an existing request buffer into a
+ * SMB_COM_NT_CANCEL request and then sends it.
+ */
+static int
+send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
+                struct mid_q_entry *mid)
+{
+        int rc = 0;
+
+        /* -4 for RFC1001 length and +2 for BCC field */
+        in_buf->smb_buf_length = sizeof(struct smb_hdr) - 4  + 2;
+        in_buf->Command = SMB_COM_NT_CANCEL;
+        in_buf->WordCount = 0;
+        put_bcc_le(0, in_buf);
+
+        mutex_lock(&server->srv_mutex);
+        rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
+        if (rc) {
+                mutex_unlock(&server->srv_mutex);
+                return rc;
+        }
+        rc = smb_send(server, in_buf, in_buf->smb_buf_length);
+        mutex_unlock(&server->srv_mutex);
+
+        cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
+                in_buf->Mid, rc);
+
+        return rc;
+}
+
 int
 SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
              struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
@@ -390,7 +509,6 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
         int rc = 0;
         int long_op;
         unsigned int receive_len;
-        unsigned long timeout;
         struct mid_q_entry *midQ;
         struct smb_hdr *in_buf = iov[0].iov_base;
 
@@ -413,7 +531,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
            to the same server. We may make this configurable later or
            use ses->maxReq */
 
-        rc = wait_for_free_request(ses, long_op);
+        rc = wait_for_free_request(ses->server, long_op);
         if (rc) {
                 cifs_small_buf_release(in_buf);
                 return rc;
@@ -457,65 +575,20 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
         if (rc < 0)
                 goto out;
 
-        if (long_op == CIFS_STD_OP)
-                timeout = 15 * HZ;
-        else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */
-                timeout = 180 * HZ;
-        else if (long_op == CIFS_LONG_OP)
-                timeout = 45 * HZ; /* should be greater than
-                        servers oplock break timeout (about 43 seconds) */
-        else if (long_op == CIFS_ASYNC_OP)
+        if (long_op == CIFS_ASYNC_OP)
                 goto out;
-        else if (long_op == CIFS_BLOCKING_OP)
-                timeout = 0x7FFFFFFF; /*  large, but not so large as to wrap */
-        else {
-                cERROR(1, "unknown timeout flag %d", long_op);
-                rc = -EIO;
-                goto out;
-        }
-
-        /* wait for 15 seconds or until woken up due to response arriving or
-           due to last connection to this server being unmounted */
-        if (signal_pending(current)) {
-                /* if signal pending do not hold up user for full smb timeout
-                but we still give response a chance to complete */
-                timeout = 2 * HZ;
-        }
-
-        /* No user interrupts in wait - wreaks havoc with performance */
-        wait_for_response(ses, midQ, timeout, 10 * HZ);
-
-        spin_lock(&GlobalMid_Lock);
 
-        if (midQ->resp_buf == NULL) {
-                cERROR(1, "No response to cmd %d mid %d",
-                        midQ->command, midQ->mid);
-                if (midQ->midState == MID_REQUEST_SUBMITTED) {
-                        if (ses->server->tcpStatus == CifsExiting)
-                                rc = -EHOSTDOWN;
-                        else {
-                                ses->server->tcpStatus = CifsNeedReconnect;
-                                midQ->midState = MID_RETRY_NEEDED;
-                        }
-                }
+        rc = wait_for_response(ses->server, midQ);
+        if (rc != 0)
+                goto out;
 
-                if (rc != -EHOSTDOWN) {
-                        if (midQ->midState == MID_RETRY_NEEDED) {
-                                rc = -EAGAIN;
-                                cFYI(1, "marking request for retry");
-                        } else {
-                                rc = -EIO;
-                        }
-                }
-                spin_unlock(&GlobalMid_Lock);
-                DeleteMidQEntry(midQ);
-                /* Update # of requests on wire to server */
+        rc = sync_mid_result(midQ, ses->server);
+        if (rc != 0) {
                 atomic_dec(&ses->server->inFlight);
                 wake_up(&ses->server->request_q);
                 return rc;
         }
 
-        spin_unlock(&GlobalMid_Lock);
         receive_len = midQ->resp_buf->smb_buf_length;
 
         if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
@@ -559,19 +632,18 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
                 if (receive_len >= sizeof(struct smb_hdr) - 4
                     /* do not count RFC1001 header */  +
                     (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
-                        BCC(midQ->resp_buf) =
-                                le16_to_cpu(BCC_LE(midQ->resp_buf));
+                        put_bcc(get_bcc_le(midQ->resp_buf), midQ->resp_buf);
                 if ((flags & CIFS_NO_RESP) == 0)
                         midQ->resp_buf = NULL;  /* mark it so buf will
                                                    not be freed by
-                                                   DeleteMidQEntry */
+                                                   delete_mid */
         } else {
                 rc = -EIO;
                 cFYI(1, "Bad MID state?");
         }
 
 out:
-        DeleteMidQEntry(midQ);
+        delete_mid(midQ);
         atomic_dec(&ses->server->inFlight);
         wake_up(&ses->server->request_q);
 
@@ -585,7 +657,6 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 {
         int rc = 0;
         unsigned int receive_len;
-        unsigned long timeout;
         struct mid_q_entry *midQ;
 
         if (ses == NULL) {
@@ -610,7 +681,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
                 return -EIO;
         }
 
-        rc = wait_for_free_request(ses, long_op);
+        rc = wait_for_free_request(ses->server, long_op);
         if (rc)
                 return rc;
 
@@ -649,64 +720,20 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
         if (rc < 0)
                 goto out;
 
-        if (long_op == CIFS_STD_OP)
-                timeout = 15 * HZ;
-        /* wait for 15 seconds or until woken up due to response arriving or
-           due to last connection to this server being unmounted */
-        else if (long_op == CIFS_ASYNC_OP)
+        if (long_op == CIFS_ASYNC_OP)
                 goto out;
-        else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */
-                timeout = 180 * HZ;
-        else if (long_op == CIFS_LONG_OP)
-                timeout = 45 * HZ; /* should be greater than
-                        servers oplock break timeout (about 43 seconds) */
-        else if (long_op == CIFS_BLOCKING_OP)
-                timeout = 0x7FFFFFFF; /* large but no so large as to wrap */
-        else {
-                cERROR(1, "unknown timeout flag %d", long_op);
-                rc = -EIO;
-                goto out;
-        }
 
-        if (signal_pending(current)) {
-                /* if signal pending do not hold up user for full smb timeout
-                but we still give response a chance to complete */
-                timeout = 2 * HZ;
-        }
-
-        /* No user interrupts in wait - wreaks havoc with performance */
-        wait_for_response(ses, midQ, timeout, 10 * HZ);
-
-        spin_lock(&GlobalMid_Lock);
-        if (midQ->resp_buf == NULL) {
-                cERROR(1, "No response for cmd %d mid %d",
-                          midQ->command, midQ->mid);
-                if (midQ->midState == MID_REQUEST_SUBMITTED) {
-                        if (ses->server->tcpStatus == CifsExiting)
-                                rc = -EHOSTDOWN;
-                        else {
-                                ses->server->tcpStatus = CifsNeedReconnect;
-                                midQ->midState = MID_RETRY_NEEDED;
-                        }
-                }
+        rc = wait_for_response(ses->server, midQ);
+        if (rc != 0)
+                goto out;
 
-                if (rc != -EHOSTDOWN) {
-                        if (midQ->midState == MID_RETRY_NEEDED) {
-                                rc = -EAGAIN;
-                                cFYI(1, "marking request for retry");
-                        } else {
-                                rc = -EIO;
-                        }
-                }
-                spin_unlock(&GlobalMid_Lock);
-                DeleteMidQEntry(midQ);
-                /* Update # of requests on wire to server */
+        rc = sync_mid_result(midQ, ses->server);
+        if (rc != 0) {
                 atomic_dec(&ses->server->inFlight);
                 wake_up(&ses->server->request_q);
                 return rc;
         }
 
-        spin_unlock(&GlobalMid_Lock);
         receive_len = midQ->resp_buf->smb_buf_length;
 
         if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
@@ -748,43 +775,20 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
                 if (receive_len >= sizeof(struct smb_hdr) - 4
                     /* do not count RFC1001 header */  +
                     (2 * out_buf->WordCount) + 2 /* bcc */ )
-                        BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
+                        put_bcc(get_bcc_le(midQ->resp_buf), midQ->resp_buf);
         } else {
                 rc = -EIO;
                 cERROR(1, "Bad MID state?");
         }
 
 out:
-        DeleteMidQEntry(midQ);
+        delete_mid(midQ);
         atomic_dec(&ses->server->inFlight);
         wake_up(&ses->server->request_q);
 
         return rc;
 }
 
-/* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */
-
-static int
-send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf,
-                struct mid_q_entry *midQ)
-{
-        int rc = 0;
-        struct cifsSesInfo *ses = tcon->ses;
-        __u16 mid = in_buf->Mid;
-
-        header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0);
-        in_buf->Mid = mid;
-        mutex_lock(&ses->server->srv_mutex);
-        rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
-        if (rc) {
-                mutex_unlock(&ses->server->srv_mutex);
-                return rc;
-        }
-        rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
-        mutex_unlock(&ses->server->srv_mutex);
-        return rc;
-}
-
 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
    blocking lock to return. */
 
@@ -807,7 +811,7 @@ send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
         pSMB->hdr.Mid = GetNextMid(ses->server);
 
         return SendReceive(xid, ses, in_buf, out_buf,
-                        &bytes_returned, CIFS_STD_OP);
+                        &bytes_returned, 0);
 }
 
 int
@@ -845,7 +849,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
                 return -EIO;
         }
 
-        rc = wait_for_free_request(ses, CIFS_BLOCKING_OP);
+        rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP);
         if (rc)
                 return rc;
 
@@ -863,7 +867,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
 
         rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
         if (rc) {
-                DeleteMidQEntry(midQ);
+                delete_mid(midQ);
                 mutex_unlock(&ses->server->srv_mutex);
                 return rc;
         }
@@ -880,7 +884,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
         mutex_unlock(&ses->server->srv_mutex);
 
         if (rc < 0) {
-                DeleteMidQEntry(midQ);
+                delete_mid(midQ);
                 return rc;
         }
 
@@ -899,10 +903,9 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
                 if (in_buf->Command == SMB_COM_TRANSACTION2) {
                         /* POSIX lock. We send a NT_CANCEL SMB to cause the
                            blocking lock to return. */
-
-                        rc = send_nt_cancel(tcon, in_buf, midQ);
+                        rc = send_nt_cancel(ses->server, in_buf, midQ);
                         if (rc) {
-                                DeleteMidQEntry(midQ);
+                                delete_mid(midQ);
                                 return rc;
                         }
                 } else {
@@ -914,47 +917,22 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
                         /* If we get -ENOLCK back the lock may have
                            already been removed. Don't exit in this case. */
                         if (rc && rc != -ENOLCK) {
-                                DeleteMidQEntry(midQ);
+                                delete_mid(midQ);
                                 return rc;
                         }
                 }
 
-                /* Wait 5 seconds for the response. */
-                if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) {
+                if (wait_for_response(ses->server, midQ) == 0) {
                         /* We got the response - restart system call. */
                         rstart = 1;
                 }
         }
 
-        spin_lock(&GlobalMid_Lock);
-        if (midQ->resp_buf) {
-                spin_unlock(&GlobalMid_Lock);
-                receive_len = midQ->resp_buf->smb_buf_length;
-        } else {
-                cERROR(1, "No response for cmd %d mid %d",
-                          midQ->command, midQ->mid);
-                if (midQ->midState == MID_REQUEST_SUBMITTED) {
-                        if (ses->server->tcpStatus == CifsExiting)
-                                rc = -EHOSTDOWN;
-                        else {
-                                ses->server->tcpStatus = CifsNeedReconnect;
-                                midQ->midState = MID_RETRY_NEEDED;
-                        }
-                }
-
-                if (rc != -EHOSTDOWN) {
-                        if (midQ->midState == MID_RETRY_NEEDED) {
-                                rc = -EAGAIN;
-                                cFYI(1, "marking request for retry");
-                        } else {
-                                rc = -EIO;
-                        }
-                }
-                spin_unlock(&GlobalMid_Lock);
-                DeleteMidQEntry(midQ);
+        rc = sync_mid_result(midQ, ses->server);
+        if (rc != 0)
                 return rc;
-        }
 
+        receive_len = midQ->resp_buf->smb_buf_length;
         if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
                 cERROR(1, "Frame too large received.  Length: %d  Xid: %d",
                         receive_len, xid);
@@ -998,10 +976,10 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
         if (receive_len >= sizeof(struct smb_hdr) - 4
             /* do not count RFC1001 header */  +
             (2 * out_buf->WordCount) + 2 /* bcc */ )
-                BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
+                put_bcc(get_bcc_le(out_buf), out_buf);
 
 out:
-        DeleteMidQEntry(midQ);
+        delete_mid(midQ);
         if (rstart && rc == -EACCES)
                 return -ERESTARTSYS;
         return rc;