4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 * Jeremy Allison (jra@samba.org) 2006.
8 * This library is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as published
10 * by the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 * the GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/list.h>
25 #include <linux/gfp.h>
26 #include <linux/wait.h>
27 #include <linux/net.h>
28 #include <linux/delay.h>
29 #include <asm/uaccess.h>
30 #include <asm/processor.h>
31 #include <linux/mempool.h>
34 #include "cifsproto.h"
35 #include "cifs_debug.h"
37 extern mempool_t *cifs_mid_poolp;
40 wake_up_task(struct mid_q_entry *mid)
42 wake_up_process(mid->callback_data);
46 AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
48 struct mid_q_entry *temp;
51 cERROR(1, "Null TCP session in AllocMidQEntry");
55 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
59 memset(temp, 0, sizeof(struct mid_q_entry));
60 temp->mid = smb_buffer->Mid; /* always LE */
61 temp->pid = current->pid;
62 temp->command = smb_buffer->Command;
63 cFYI(1, "For smb_command %d", temp->command);
64 /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
65 /* when mid allocated can be before when sent */
66 temp->when_alloc = jiffies;
69 * The default is for the mid to be synchronous, so the
70 * default callback just wakes up the current task.
72 temp->callback = wake_up_task;
73 temp->callback_data = current;
76 atomic_inc(&midCount);
77 temp->midState = MID_REQUEST_ALLOCATED;
82 DeleteMidQEntry(struct mid_q_entry *midEntry)
84 #ifdef CONFIG_CIFS_STATS2
87 midEntry->midState = MID_FREE;
88 atomic_dec(&midCount);
89 if (midEntry->largeBuf)
90 cifs_buf_release(midEntry->resp_buf);
92 cifs_small_buf_release(midEntry->resp_buf);
93 #ifdef CONFIG_CIFS_STATS2
95 /* commands taking longer than one second are indications that
96 something is wrong, unless it is quite a slow link or server */
97 if ((now - midEntry->when_alloc) > HZ) {
98 if ((cifsFYI & CIFS_TIMER) &&
99 (midEntry->command != SMB_COM_LOCKING_ANDX)) {
100 printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d",
101 midEntry->command, midEntry->mid);
102 printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
103 now - midEntry->when_alloc,
104 now - midEntry->when_sent,
105 now - midEntry->when_received);
109 mempool_free(midEntry, cifs_mid_poolp);
113 delete_mid(struct mid_q_entry *mid)
115 spin_lock(&GlobalMid_Lock);
116 list_del(&mid->qhead);
117 spin_unlock(&GlobalMid_Lock);
119 DeleteMidQEntry(mid);
123 smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec)
127 struct msghdr smb_msg;
128 struct smb_hdr *smb_buffer = iov[0].iov_base;
129 unsigned int len = iov[0].iov_len;
130 unsigned int total_len;
132 unsigned int smb_buf_length = be32_to_cpu(smb_buffer->smb_buf_length);
133 struct socket *ssocket = server->ssocket;
136 return -ENOTSOCK; /* BB eventually add reconnect code here */
138 smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
139 smb_msg.msg_namelen = sizeof(struct sockaddr);
140 smb_msg.msg_control = NULL;
141 smb_msg.msg_controllen = 0;
142 if (server->noblocksnd)
143 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
145 smb_msg.msg_flags = MSG_NOSIGNAL;
148 for (i = 0; i < n_vec; i++)
149 total_len += iov[i].iov_len;
151 cFYI(1, "Sending smb: total_len %d", total_len);
152 dump_smb(smb_buffer, len);
156 rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
157 n_vec - first_vec, total_len);
158 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
160 /* if blocking send we try 3 times, since each can block
161 for 5 seconds. For nonblocking we have to try more
162 but wait increasing amounts of time allowing time for
163 socket to clear. The overall time we wait in either
164 case to send on the socket is about 15 seconds.
165 Similarly we wait for 15 seconds for
166 a response from the server in SendReceive[2]
167 for the server to send a response back for
168 most types of requests (except SMB Write
169 past end of file which can be slow, and
170 blocking lock operations). NFS waits slightly longer
171 than CIFS, but this can make it take longer for
172 nonresponsive servers to be detected and 15 seconds
173 is more than enough time for modern networks to
174 send a packet. In most cases if we fail to send
175 after the retries we will kill the socket and
176 reconnect which may clear the network problem.
178 if ((i >= 14) || (!server->noblocksnd && (i > 2))) {
179 cERROR(1, "sends on sock %p stuck for 15 seconds",
190 if (rc == total_len) {
193 } else if (rc > total_len) {
194 cERROR(1, "sent %d requested %d", rc, total_len);
198 /* should never happen, letting socket clear before
199 retrying is our only obvious option here */
200 cERROR(1, "tcp sent no data");
205 /* the line below resets i */
206 for (i = first_vec; i < n_vec; i++) {
207 if (iov[i].iov_len) {
208 if (rc > iov[i].iov_len) {
209 rc -= iov[i].iov_len;
212 iov[i].iov_base += rc;
213 iov[i].iov_len -= rc;
219 i = 0; /* in case we get ENOSPC on the next send */
222 if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
223 cFYI(1, "partial send (%d remaining), terminating session",
225 /* If we have only sent part of an SMB then the next SMB
226 could be taken as the remainder of this one. We need
227 to kill the socket so the server throws away the partial
229 server->tcpStatus = CifsNeedReconnect;
232 if (rc < 0 && rc != -EINTR)
233 cERROR(1, "Error %d sending data on socket to server", rc);
237 /* Don't want to modify the buffer as a
238 side effect of this call. */
239 smb_buffer->smb_buf_length = cpu_to_be32(smb_buf_length);
245 smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
246 unsigned int smb_buf_length)
250 iov.iov_base = smb_buffer;
251 iov.iov_len = smb_buf_length + 4;
253 return smb_sendv(server, &iov, 1);
256 static int wait_for_free_request(struct TCP_Server_Info *server,
259 if (long_op == CIFS_ASYNC_OP) {
260 /* oplock breaks must not be held up */
261 atomic_inc(&server->inFlight);
265 spin_lock(&GlobalMid_Lock);
267 if (atomic_read(&server->inFlight) >= cifs_max_pending) {
268 spin_unlock(&GlobalMid_Lock);
269 cifs_num_waiters_inc(server);
270 wait_event(server->request_q,
271 atomic_read(&server->inFlight)
273 cifs_num_waiters_dec(server);
274 spin_lock(&GlobalMid_Lock);
276 if (server->tcpStatus == CifsExiting) {
277 spin_unlock(&GlobalMid_Lock);
281 /* can not count locking commands against total
282 as they are allowed to block on server */
284 /* update # of requests on the wire to server */
285 if (long_op != CIFS_BLOCKING_OP)
286 atomic_inc(&server->inFlight);
287 spin_unlock(&GlobalMid_Lock);
294 static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf,
295 struct mid_q_entry **ppmidQ)
297 if (ses->server->tcpStatus == CifsExiting) {
301 if (ses->server->tcpStatus == CifsNeedReconnect) {
302 cFYI(1, "tcp session dead - return to caller to retry");
306 if (ses->status != CifsGood) {
307 /* check if SMB session is bad because we are setting it up */
308 if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
309 (in_buf->Command != SMB_COM_NEGOTIATE))
311 /* else ok - we are setting up session */
313 *ppmidQ = AllocMidQEntry(in_buf, ses->server);
316 spin_lock(&GlobalMid_Lock);
317 list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
318 spin_unlock(&GlobalMid_Lock);
323 wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
327 error = wait_event_killable(server->response_q,
328 midQ->midState != MID_REQUEST_SUBMITTED);
337 * Send a SMB request and set the callback function in the mid to handle
338 * the result. Caller is responsible for dealing with timeouts.
341 cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov,
342 unsigned int nvec, mid_receive_t *receive,
343 mid_callback_t *callback, void *cbdata, bool ignore_pend)
346 struct mid_q_entry *mid;
347 struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base;
349 rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0);
353 /* enable signing if server requires it */
354 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
355 hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
357 mutex_lock(&server->srv_mutex);
358 mid = AllocMidQEntry(hdr, server);
360 mutex_unlock(&server->srv_mutex);
361 atomic_dec(&server->inFlight);
362 wake_up(&server->request_q);
366 /* put it on the pending_mid_q */
367 spin_lock(&GlobalMid_Lock);
368 list_add_tail(&mid->qhead, &server->pending_mid_q);
369 spin_unlock(&GlobalMid_Lock);
371 rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number);
373 mutex_unlock(&server->srv_mutex);
377 mid->receive = receive;
378 mid->callback = callback;
379 mid->callback_data = cbdata;
380 mid->midState = MID_REQUEST_SUBMITTED;
382 cifs_in_send_inc(server);
383 rc = smb_sendv(server, iov, nvec);
384 cifs_in_send_dec(server);
385 cifs_save_when_sent(mid);
386 mutex_unlock(&server->srv_mutex);
394 atomic_dec(&server->inFlight);
395 wake_up(&server->request_q);
401 * Send an SMB Request. No response info (other than return code)
402 * needs to be parsed.
404 * flags indicate the type of request buffer and how long to wait
405 * and whether to log NT STATUS code (error) before mapping it to POSIX error
409 SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses,
410 struct smb_hdr *in_buf, int flags)
416 iov[0].iov_base = (char *)in_buf;
417 iov[0].iov_len = be32_to_cpu(in_buf->smb_buf_length) + 4;
418 flags |= CIFS_NO_RESP;
419 rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
420 cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc);
426 cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
430 cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command,
431 mid->mid, mid->midState);
433 spin_lock(&GlobalMid_Lock);
434 switch (mid->midState) {
435 case MID_RESPONSE_RECEIVED:
436 spin_unlock(&GlobalMid_Lock);
438 case MID_RETRY_NEEDED:
441 case MID_RESPONSE_MALFORMED:
448 list_del_init(&mid->qhead);
449 cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__,
450 mid->mid, mid->midState);
453 spin_unlock(&GlobalMid_Lock);
455 DeleteMidQEntry(mid);
460 * An NT cancel request header looks just like the original request except:
462 * The Command is SMB_COM_NT_CANCEL
463 * The WordCount is zeroed out
464 * The ByteCount is zeroed out
466 * This function mangles an existing request buffer into a
467 * SMB_COM_NT_CANCEL request and then sends it.
470 send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
471 struct mid_q_entry *mid)
475 /* -4 for RFC1001 length and +2 for BCC field */
476 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
477 in_buf->Command = SMB_COM_NT_CANCEL;
478 in_buf->WordCount = 0;
481 mutex_lock(&server->srv_mutex);
482 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
484 mutex_unlock(&server->srv_mutex);
487 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
488 mutex_unlock(&server->srv_mutex);
490 cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
497 cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
500 unsigned int len = be32_to_cpu(mid->resp_buf->smb_buf_length) + 4;
502 dump_smb(mid->resp_buf, min_t(u32, 92, len));
504 /* convert the length into a more usable form */
505 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
508 iov.iov_base = mid->resp_buf;
510 /* FIXME: add code to kill session */
511 if (cifs_verify_signature(&iov, 1, server,
512 mid->sequence_number + 1) != 0)
513 cERROR(1, "Unexpected SMB signature");
516 /* BB special case reconnect tid and uid here? */
517 return map_smb_to_linux_error(mid->resp_buf, log_error);
521 SendReceive2(const unsigned int xid, struct cifs_ses *ses,
522 struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
527 struct mid_q_entry *midQ;
528 struct smb_hdr *in_buf = iov[0].iov_base;
530 long_op = flags & CIFS_TIMEOUT_MASK;
532 *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
534 if ((ses == NULL) || (ses->server == NULL)) {
535 cifs_small_buf_release(in_buf);
536 cERROR(1, "Null session");
540 if (ses->server->tcpStatus == CifsExiting) {
541 cifs_small_buf_release(in_buf);
545 /* Ensure that we do not send more than 50 overlapping requests
546 to the same server. We may make this configurable later or
549 rc = wait_for_free_request(ses->server, long_op);
551 cifs_small_buf_release(in_buf);
555 /* make sure that we sign in the same order that we send on this socket
556 and avoid races inside tcp sendmsg code that could cause corruption
559 mutex_lock(&ses->server->srv_mutex);
561 rc = allocate_mid(ses, in_buf, &midQ);
563 mutex_unlock(&ses->server->srv_mutex);
564 cifs_small_buf_release(in_buf);
565 /* Update # of requests on wire to server */
566 atomic_dec(&ses->server->inFlight);
567 wake_up(&ses->server->request_q);
570 rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
572 mutex_unlock(&ses->server->srv_mutex);
573 cifs_small_buf_release(in_buf);
577 midQ->midState = MID_REQUEST_SUBMITTED;
578 cifs_in_send_inc(ses->server);
579 rc = smb_sendv(ses->server, iov, n_vec);
580 cifs_in_send_dec(ses->server);
581 cifs_save_when_sent(midQ);
583 mutex_unlock(&ses->server->srv_mutex);
586 cifs_small_buf_release(in_buf);
590 if (long_op == CIFS_ASYNC_OP) {
591 cifs_small_buf_release(in_buf);
595 rc = wait_for_response(ses->server, midQ);
597 send_nt_cancel(ses->server, in_buf, midQ);
598 spin_lock(&GlobalMid_Lock);
599 if (midQ->midState == MID_REQUEST_SUBMITTED) {
600 midQ->callback = DeleteMidQEntry;
601 spin_unlock(&GlobalMid_Lock);
602 cifs_small_buf_release(in_buf);
603 atomic_dec(&ses->server->inFlight);
604 wake_up(&ses->server->request_q);
607 spin_unlock(&GlobalMid_Lock);
610 cifs_small_buf_release(in_buf);
612 rc = cifs_sync_mid_result(midQ, ses->server);
614 atomic_dec(&ses->server->inFlight);
615 wake_up(&ses->server->request_q);
619 if (!midQ->resp_buf || midQ->midState != MID_RESPONSE_RECEIVED) {
621 cFYI(1, "Bad MID state?");
625 iov[0].iov_base = (char *)midQ->resp_buf;
626 iov[0].iov_len = be32_to_cpu(midQ->resp_buf->smb_buf_length) + 4;
628 *pRespBufType = CIFS_LARGE_BUFFER;
630 *pRespBufType = CIFS_SMALL_BUFFER;
632 rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR);
634 /* mark it so buf will not be freed by delete_mid */
635 if ((flags & CIFS_NO_RESP) == 0)
636 midQ->resp_buf = NULL;
639 atomic_dec(&ses->server->inFlight);
640 wake_up(&ses->server->request_q);
646 SendReceive(const unsigned int xid, struct cifs_ses *ses,
647 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
648 int *pbytes_returned, const int long_op)
651 struct mid_q_entry *midQ;
654 cERROR(1, "Null smb session");
657 if (ses->server == NULL) {
658 cERROR(1, "Null tcp session");
662 if (ses->server->tcpStatus == CifsExiting)
665 /* Ensure that we do not send more than 50 overlapping requests
666 to the same server. We may make this configurable later or
669 if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
670 MAX_CIFS_HDR_SIZE - 4) {
671 cERROR(1, "Illegal length, greater than maximum frame, %d",
672 be32_to_cpu(in_buf->smb_buf_length));
676 rc = wait_for_free_request(ses->server, long_op);
680 /* make sure that we sign in the same order that we send on this socket
681 and avoid races inside tcp sendmsg code that could cause corruption
684 mutex_lock(&ses->server->srv_mutex);
686 rc = allocate_mid(ses, in_buf, &midQ);
688 mutex_unlock(&ses->server->srv_mutex);
689 /* Update # of requests on wire to server */
690 atomic_dec(&ses->server->inFlight);
691 wake_up(&ses->server->request_q);
695 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
697 mutex_unlock(&ses->server->srv_mutex);
701 midQ->midState = MID_REQUEST_SUBMITTED;
703 cifs_in_send_inc(ses->server);
704 rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
705 cifs_in_send_dec(ses->server);
706 cifs_save_when_sent(midQ);
707 mutex_unlock(&ses->server->srv_mutex);
712 if (long_op == CIFS_ASYNC_OP)
715 rc = wait_for_response(ses->server, midQ);
717 send_nt_cancel(ses->server, in_buf, midQ);
718 spin_lock(&GlobalMid_Lock);
719 if (midQ->midState == MID_REQUEST_SUBMITTED) {
720 /* no longer considered to be "in-flight" */
721 midQ->callback = DeleteMidQEntry;
722 spin_unlock(&GlobalMid_Lock);
723 atomic_dec(&ses->server->inFlight);
724 wake_up(&ses->server->request_q);
727 spin_unlock(&GlobalMid_Lock);
730 rc = cifs_sync_mid_result(midQ, ses->server);
732 atomic_dec(&ses->server->inFlight);
733 wake_up(&ses->server->request_q);
737 if (!midQ->resp_buf || !out_buf ||
738 midQ->midState != MID_RESPONSE_RECEIVED) {
740 cERROR(1, "Bad MID state?");
744 *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length);
745 memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
746 rc = cifs_check_receive(midQ, ses->server, 0);
749 atomic_dec(&ses->server->inFlight);
750 wake_up(&ses->server->request_q);
755 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
756 blocking lock to return. */
759 send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon,
760 struct smb_hdr *in_buf,
761 struct smb_hdr *out_buf)
764 struct cifs_ses *ses = tcon->ses;
765 LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
767 /* We just modify the current in_buf to change
768 the type of lock from LOCKING_ANDX_SHARED_LOCK
769 or LOCKING_ANDX_EXCLUSIVE_LOCK to
770 LOCKING_ANDX_CANCEL_LOCK. */
772 pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
774 pSMB->hdr.Mid = GetNextMid(ses->server);
776 return SendReceive(xid, ses, in_buf, out_buf,
781 SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
782 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
783 int *pbytes_returned)
787 struct mid_q_entry *midQ;
788 struct cifs_ses *ses;
790 if (tcon == NULL || tcon->ses == NULL) {
791 cERROR(1, "Null smb session");
796 if (ses->server == NULL) {
797 cERROR(1, "Null tcp session");
801 if (ses->server->tcpStatus == CifsExiting)
804 /* Ensure that we do not send more than 50 overlapping requests
805 to the same server. We may make this configurable later or
808 if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize +
809 MAX_CIFS_HDR_SIZE - 4) {
810 cERROR(1, "Illegal length, greater than maximum frame, %d",
811 be32_to_cpu(in_buf->smb_buf_length));
815 rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP);
819 /* make sure that we sign in the same order that we send on this socket
820 and avoid races inside tcp sendmsg code that could cause corruption
823 mutex_lock(&ses->server->srv_mutex);
825 rc = allocate_mid(ses, in_buf, &midQ);
827 mutex_unlock(&ses->server->srv_mutex);
831 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
834 mutex_unlock(&ses->server->srv_mutex);
838 midQ->midState = MID_REQUEST_SUBMITTED;
839 cifs_in_send_inc(ses->server);
840 rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
841 cifs_in_send_dec(ses->server);
842 cifs_save_when_sent(midQ);
843 mutex_unlock(&ses->server->srv_mutex);
850 /* Wait for a reply - allow signals to interrupt. */
851 rc = wait_event_interruptible(ses->server->response_q,
852 (!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
853 ((ses->server->tcpStatus != CifsGood) &&
854 (ses->server->tcpStatus != CifsNew)));
856 /* Were we interrupted by a signal ? */
857 if ((rc == -ERESTARTSYS) &&
858 (midQ->midState == MID_REQUEST_SUBMITTED) &&
859 ((ses->server->tcpStatus == CifsGood) ||
860 (ses->server->tcpStatus == CifsNew))) {
862 if (in_buf->Command == SMB_COM_TRANSACTION2) {
863 /* POSIX lock. We send a NT_CANCEL SMB to cause the
864 blocking lock to return. */
865 rc = send_nt_cancel(ses->server, in_buf, midQ);
871 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
872 to cause the blocking lock to return. */
874 rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
876 /* If we get -ENOLCK back the lock may have
877 already been removed. Don't exit in this case. */
878 if (rc && rc != -ENOLCK) {
884 rc = wait_for_response(ses->server, midQ);
886 send_nt_cancel(ses->server, in_buf, midQ);
887 spin_lock(&GlobalMid_Lock);
888 if (midQ->midState == MID_REQUEST_SUBMITTED) {
889 /* no longer considered to be "in-flight" */
890 midQ->callback = DeleteMidQEntry;
891 spin_unlock(&GlobalMid_Lock);
894 spin_unlock(&GlobalMid_Lock);
897 /* We got the response - restart system call. */
901 rc = cifs_sync_mid_result(midQ, ses->server);
905 /* rcvd frame is ok */
906 if (out_buf == NULL || midQ->midState != MID_RESPONSE_RECEIVED) {
908 cERROR(1, "Bad MID state?");
912 *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length);
913 memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4);
914 rc = cifs_check_receive(midQ, ses->server, 0);
917 if (rstart && rc == -EACCES)