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 = 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;
147 /* smb header is converted in header_assemble. bcc and rest of SMB word
148 area, and byte area if necessary, is converted to littleendian in
149 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
150 Flags2 is converted in SendReceive */
154 for (i = 0; i < n_vec; i++)
155 total_len += iov[i].iov_len;
157 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
158 cFYI(1, "Sending smb: total_len %d", total_len);
159 dump_smb(smb_buffer, len);
163 rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
164 n_vec - first_vec, total_len);
165 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
167 /* if blocking send we try 3 times, since each can block
168 for 5 seconds. For nonblocking we have to try more
169 but wait increasing amounts of time allowing time for
170 socket to clear. The overall time we wait in either
171 case to send on the socket is about 15 seconds.
172 Similarly we wait for 15 seconds for
173 a response from the server in SendReceive[2]
174 for the server to send a response back for
175 most types of requests (except SMB Write
176 past end of file which can be slow, and
177 blocking lock operations). NFS waits slightly longer
178 than CIFS, but this can make it take longer for
179 nonresponsive servers to be detected and 15 seconds
180 is more than enough time for modern networks to
181 send a packet. In most cases if we fail to send
182 after the retries we will kill the socket and
183 reconnect which may clear the network problem.
185 if ((i >= 14) || (!server->noblocksnd && (i > 2))) {
186 cERROR(1, "sends on sock %p stuck for 15 seconds",
197 if (rc == total_len) {
200 } else if (rc > total_len) {
201 cERROR(1, "sent %d requested %d", rc, total_len);
205 /* should never happen, letting socket clear before
206 retrying is our only obvious option here */
207 cERROR(1, "tcp sent no data");
212 /* the line below resets i */
213 for (i = first_vec; i < n_vec; i++) {
214 if (iov[i].iov_len) {
215 if (rc > iov[i].iov_len) {
216 rc -= iov[i].iov_len;
219 iov[i].iov_base += rc;
220 iov[i].iov_len -= rc;
226 i = 0; /* in case we get ENOSPC on the next send */
229 if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
230 cFYI(1, "partial send (%d remaining), terminating session",
232 /* If we have only sent part of an SMB then the next SMB
233 could be taken as the remainder of this one. We need
234 to kill the socket so the server throws away the partial
236 server->tcpStatus = CifsNeedReconnect;
240 cERROR(1, "Error %d sending data on socket to server", rc);
244 /* Don't want to modify the buffer as a
245 side effect of this call. */
246 smb_buffer->smb_buf_length = smb_buf_length;
252 smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
253 unsigned int smb_buf_length)
257 iov.iov_base = smb_buffer;
258 iov.iov_len = smb_buf_length + 4;
260 return smb_sendv(server, &iov, 1);
263 static int wait_for_free_request(struct TCP_Server_Info *server,
266 if (long_op == CIFS_ASYNC_OP) {
267 /* oplock breaks must not be held up */
268 atomic_inc(&server->inFlight);
272 spin_lock(&GlobalMid_Lock);
274 if (atomic_read(&server->inFlight) >= cifs_max_pending) {
275 spin_unlock(&GlobalMid_Lock);
276 #ifdef CONFIG_CIFS_STATS2
277 atomic_inc(&server->num_waiters);
279 wait_event(server->request_q,
280 atomic_read(&server->inFlight)
282 #ifdef CONFIG_CIFS_STATS2
283 atomic_dec(&server->num_waiters);
285 spin_lock(&GlobalMid_Lock);
287 if (server->tcpStatus == CifsExiting) {
288 spin_unlock(&GlobalMid_Lock);
292 /* can not count locking commands against total
293 as they are allowed to block on server */
295 /* update # of requests on the wire to server */
296 if (long_op != CIFS_BLOCKING_OP)
297 atomic_inc(&server->inFlight);
298 spin_unlock(&GlobalMid_Lock);
305 static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf,
306 struct mid_q_entry **ppmidQ)
308 if (ses->server->tcpStatus == CifsExiting) {
312 if (ses->server->tcpStatus == CifsNeedReconnect) {
313 cFYI(1, "tcp session dead - return to caller to retry");
317 if (ses->status != CifsGood) {
318 /* check if SMB session is bad because we are setting it up */
319 if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
320 (in_buf->Command != SMB_COM_NEGOTIATE))
322 /* else ok - we are setting up session */
324 *ppmidQ = AllocMidQEntry(in_buf, ses->server);
327 spin_lock(&GlobalMid_Lock);
328 list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q);
329 spin_unlock(&GlobalMid_Lock);
334 wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ)
338 error = wait_event_killable(server->response_q,
339 midQ->midState != MID_REQUEST_SUBMITTED);
348 * Send a SMB request and set the callback function in the mid to handle
349 * the result. Caller is responsible for dealing with timeouts.
352 cifs_call_async(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
353 mid_callback_t *callback, void *cbdata)
356 struct mid_q_entry *mid;
358 rc = wait_for_free_request(server, CIFS_ASYNC_OP);
362 mutex_lock(&server->srv_mutex);
363 mid = AllocMidQEntry(in_buf, server);
365 mutex_unlock(&server->srv_mutex);
369 /* put it on the pending_mid_q */
370 spin_lock(&GlobalMid_Lock);
371 list_add_tail(&mid->qhead, &server->pending_mid_q);
372 spin_unlock(&GlobalMid_Lock);
374 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
376 mutex_unlock(&server->srv_mutex);
380 mid->callback = callback;
381 mid->callback_data = cbdata;
382 mid->midState = MID_REQUEST_SUBMITTED;
383 #ifdef CONFIG_CIFS_STATS2
384 atomic_inc(&server->inSend);
386 rc = smb_send(server, in_buf, in_buf->smb_buf_length);
387 #ifdef CONFIG_CIFS_STATS2
388 atomic_dec(&server->inSend);
389 mid->when_sent = jiffies;
391 mutex_unlock(&server->srv_mutex);
398 atomic_dec(&server->inFlight);
399 wake_up(&server->request_q);
405 * Send an SMB Request. No response info (other than return code)
406 * needs to be parsed.
408 * flags indicate the type of request buffer and how long to wait
409 * and whether to log NT STATUS code (error) before mapping it to POSIX error
413 SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
414 struct smb_hdr *in_buf, int flags)
420 iov[0].iov_base = (char *)in_buf;
421 iov[0].iov_len = in_buf->smb_buf_length + 4;
422 flags |= CIFS_NO_RESP;
423 rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
424 cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc);
430 sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
434 cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command,
435 mid->mid, mid->midState);
437 spin_lock(&GlobalMid_Lock);
438 /* ensure that it's no longer on the pending_mid_q */
439 list_del_init(&mid->qhead);
441 switch (mid->midState) {
442 case MID_RESPONSE_RECEIVED:
443 spin_unlock(&GlobalMid_Lock);
445 case MID_REQUEST_SUBMITTED:
446 /* socket is going down, reject all calls */
447 if (server->tcpStatus == CifsExiting) {
448 cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d",
449 __func__, mid->mid, mid->command, mid->midState);
453 case MID_RETRY_NEEDED:
457 cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__,
458 mid->mid, mid->midState);
461 spin_unlock(&GlobalMid_Lock);
463 DeleteMidQEntry(mid);
468 * An NT cancel request header looks just like the original request except:
470 * The Command is SMB_COM_NT_CANCEL
471 * The WordCount is zeroed out
472 * The ByteCount is zeroed out
474 * This function mangles an existing request buffer into a
475 * SMB_COM_NT_CANCEL request and then sends it.
478 send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
479 struct mid_q_entry *mid)
483 /* -4 for RFC1001 length and +2 for BCC field */
484 in_buf->smb_buf_length = sizeof(struct smb_hdr) - 4 + 2;
485 in_buf->Command = SMB_COM_NT_CANCEL;
486 in_buf->WordCount = 0;
487 put_bcc_le(0, in_buf);
489 mutex_lock(&server->srv_mutex);
490 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
492 mutex_unlock(&server->srv_mutex);
495 rc = smb_send(server, in_buf, in_buf->smb_buf_length);
496 mutex_unlock(&server->srv_mutex);
498 cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
505 SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
506 struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
511 unsigned int receive_len;
512 struct mid_q_entry *midQ;
513 struct smb_hdr *in_buf = iov[0].iov_base;
515 long_op = flags & CIFS_TIMEOUT_MASK;
517 *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
519 if ((ses == NULL) || (ses->server == NULL)) {
520 cifs_small_buf_release(in_buf);
521 cERROR(1, "Null session");
525 if (ses->server->tcpStatus == CifsExiting) {
526 cifs_small_buf_release(in_buf);
530 /* Ensure that we do not send more than 50 overlapping requests
531 to the same server. We may make this configurable later or
534 rc = wait_for_free_request(ses->server, long_op);
536 cifs_small_buf_release(in_buf);
540 /* make sure that we sign in the same order that we send on this socket
541 and avoid races inside tcp sendmsg code that could cause corruption
544 mutex_lock(&ses->server->srv_mutex);
546 rc = allocate_mid(ses, in_buf, &midQ);
548 mutex_unlock(&ses->server->srv_mutex);
549 cifs_small_buf_release(in_buf);
550 /* Update # of requests on wire to server */
551 atomic_dec(&ses->server->inFlight);
552 wake_up(&ses->server->request_q);
555 rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
557 mutex_unlock(&ses->server->srv_mutex);
558 cifs_small_buf_release(in_buf);
562 midQ->midState = MID_REQUEST_SUBMITTED;
563 #ifdef CONFIG_CIFS_STATS2
564 atomic_inc(&ses->server->inSend);
566 rc = smb_sendv(ses->server, iov, n_vec);
567 #ifdef CONFIG_CIFS_STATS2
568 atomic_dec(&ses->server->inSend);
569 midQ->when_sent = jiffies;
572 mutex_unlock(&ses->server->srv_mutex);
573 cifs_small_buf_release(in_buf);
578 if (long_op == CIFS_ASYNC_OP)
581 rc = wait_for_response(ses->server, midQ);
585 rc = sync_mid_result(midQ, ses->server);
587 atomic_dec(&ses->server->inFlight);
588 wake_up(&ses->server->request_q);
592 receive_len = midQ->resp_buf->smb_buf_length;
594 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
595 cERROR(1, "Frame too large received. Length: %d Xid: %d",
601 /* rcvd frame is ok */
603 if (midQ->resp_buf &&
604 (midQ->midState == MID_RESPONSE_RECEIVED)) {
606 iov[0].iov_base = (char *)midQ->resp_buf;
608 *pRespBufType = CIFS_LARGE_BUFFER;
610 *pRespBufType = CIFS_SMALL_BUFFER;
611 iov[0].iov_len = receive_len + 4;
613 dump_smb(midQ->resp_buf, 80);
614 /* convert the length into a more usable form */
615 if ((receive_len > 24) &&
616 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
617 SECMODE_SIGN_ENABLED))) {
618 rc = cifs_verify_signature(midQ->resp_buf,
620 midQ->sequence_number+1);
622 cERROR(1, "Unexpected SMB signature");
623 /* BB FIXME add code to kill session */
627 /* BB special case reconnect tid and uid here? */
628 rc = map_smb_to_linux_error(midQ->resp_buf,
629 flags & CIFS_LOG_ERROR);
631 /* convert ByteCount if necessary */
632 if (receive_len >= sizeof(struct smb_hdr) - 4
633 /* do not count RFC1001 header */ +
634 (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
635 put_bcc(get_bcc_le(midQ->resp_buf), midQ->resp_buf);
636 if ((flags & CIFS_NO_RESP) == 0)
637 midQ->resp_buf = NULL; /* mark it so buf will
642 cFYI(1, "Bad MID state?");
647 atomic_dec(&ses->server->inFlight);
648 wake_up(&ses->server->request_q);
654 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
655 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
656 int *pbytes_returned, const int long_op)
659 unsigned int receive_len;
660 struct mid_q_entry *midQ;
663 cERROR(1, "Null smb session");
666 if (ses->server == NULL) {
667 cERROR(1, "Null tcp session");
671 if (ses->server->tcpStatus == CifsExiting)
674 /* Ensure that we do not send more than 50 overlapping requests
675 to the same server. We may make this configurable later or
678 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
679 cERROR(1, "Illegal length, greater than maximum frame, %d",
680 in_buf->smb_buf_length);
684 rc = wait_for_free_request(ses->server, long_op);
688 /* make sure that we sign in the same order that we send on this socket
689 and avoid races inside tcp sendmsg code that could cause corruption
692 mutex_lock(&ses->server->srv_mutex);
694 rc = allocate_mid(ses, in_buf, &midQ);
696 mutex_unlock(&ses->server->srv_mutex);
697 /* Update # of requests on wire to server */
698 atomic_dec(&ses->server->inFlight);
699 wake_up(&ses->server->request_q);
703 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
705 mutex_unlock(&ses->server->srv_mutex);
709 midQ->midState = MID_REQUEST_SUBMITTED;
710 #ifdef CONFIG_CIFS_STATS2
711 atomic_inc(&ses->server->inSend);
713 rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
714 #ifdef CONFIG_CIFS_STATS2
715 atomic_dec(&ses->server->inSend);
716 midQ->when_sent = jiffies;
718 mutex_unlock(&ses->server->srv_mutex);
723 if (long_op == CIFS_ASYNC_OP)
726 rc = wait_for_response(ses->server, midQ);
730 rc = sync_mid_result(midQ, ses->server);
732 atomic_dec(&ses->server->inFlight);
733 wake_up(&ses->server->request_q);
737 receive_len = midQ->resp_buf->smb_buf_length;
739 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
740 cERROR(1, "Frame too large received. Length: %d Xid: %d",
746 /* rcvd frame is ok */
748 if (midQ->resp_buf && out_buf
749 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
750 out_buf->smb_buf_length = receive_len;
751 memcpy((char *)out_buf + 4,
752 (char *)midQ->resp_buf + 4,
755 dump_smb(out_buf, 92);
756 /* convert the length into a more usable form */
757 if ((receive_len > 24) &&
758 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
759 SECMODE_SIGN_ENABLED))) {
760 rc = cifs_verify_signature(out_buf,
762 midQ->sequence_number+1);
764 cERROR(1, "Unexpected SMB signature");
765 /* BB FIXME add code to kill session */
769 *pbytes_returned = out_buf->smb_buf_length;
771 /* BB special case reconnect tid and uid here? */
772 rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
774 /* convert ByteCount if necessary */
775 if (receive_len >= sizeof(struct smb_hdr) - 4
776 /* do not count RFC1001 header */ +
777 (2 * out_buf->WordCount) + 2 /* bcc */ )
778 put_bcc(get_bcc_le(midQ->resp_buf), midQ->resp_buf);
781 cERROR(1, "Bad MID state?");
786 atomic_dec(&ses->server->inFlight);
787 wake_up(&ses->server->request_q);
792 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
793 blocking lock to return. */
796 send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
797 struct smb_hdr *in_buf,
798 struct smb_hdr *out_buf)
801 struct cifsSesInfo *ses = tcon->ses;
802 LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
804 /* We just modify the current in_buf to change
805 the type of lock from LOCKING_ANDX_SHARED_LOCK
806 or LOCKING_ANDX_EXCLUSIVE_LOCK to
807 LOCKING_ANDX_CANCEL_LOCK. */
809 pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
811 pSMB->hdr.Mid = GetNextMid(ses->server);
813 return SendReceive(xid, ses, in_buf, out_buf,
818 SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
819 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
820 int *pbytes_returned)
824 unsigned int receive_len;
825 struct mid_q_entry *midQ;
826 struct cifsSesInfo *ses;
828 if (tcon == NULL || tcon->ses == NULL) {
829 cERROR(1, "Null smb session");
834 if (ses->server == NULL) {
835 cERROR(1, "Null tcp session");
839 if (ses->server->tcpStatus == CifsExiting)
842 /* Ensure that we do not send more than 50 overlapping requests
843 to the same server. We may make this configurable later or
846 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
847 cERROR(1, "Illegal length, greater than maximum frame, %d",
848 in_buf->smb_buf_length);
852 rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP);
856 /* make sure that we sign in the same order that we send on this socket
857 and avoid races inside tcp sendmsg code that could cause corruption
860 mutex_lock(&ses->server->srv_mutex);
862 rc = allocate_mid(ses, in_buf, &midQ);
864 mutex_unlock(&ses->server->srv_mutex);
868 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
871 mutex_unlock(&ses->server->srv_mutex);
875 midQ->midState = MID_REQUEST_SUBMITTED;
876 #ifdef CONFIG_CIFS_STATS2
877 atomic_inc(&ses->server->inSend);
879 rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
880 #ifdef CONFIG_CIFS_STATS2
881 atomic_dec(&ses->server->inSend);
882 midQ->when_sent = jiffies;
884 mutex_unlock(&ses->server->srv_mutex);
891 /* Wait for a reply - allow signals to interrupt. */
892 rc = wait_event_interruptible(ses->server->response_q,
893 (!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
894 ((ses->server->tcpStatus != CifsGood) &&
895 (ses->server->tcpStatus != CifsNew)));
897 /* Were we interrupted by a signal ? */
898 if ((rc == -ERESTARTSYS) &&
899 (midQ->midState == MID_REQUEST_SUBMITTED) &&
900 ((ses->server->tcpStatus == CifsGood) ||
901 (ses->server->tcpStatus == CifsNew))) {
903 if (in_buf->Command == SMB_COM_TRANSACTION2) {
904 /* POSIX lock. We send a NT_CANCEL SMB to cause the
905 blocking lock to return. */
906 rc = send_nt_cancel(ses->server, in_buf, midQ);
912 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
913 to cause the blocking lock to return. */
915 rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
917 /* If we get -ENOLCK back the lock may have
918 already been removed. Don't exit in this case. */
919 if (rc && rc != -ENOLCK) {
925 if (wait_for_response(ses->server, midQ) == 0) {
926 /* We got the response - restart system call. */
931 rc = sync_mid_result(midQ, ses->server);
935 receive_len = midQ->resp_buf->smb_buf_length;
936 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
937 cERROR(1, "Frame too large received. Length: %d Xid: %d",
943 /* rcvd frame is ok */
945 if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) {
947 cERROR(1, "Bad MID state?");
951 out_buf->smb_buf_length = receive_len;
952 memcpy((char *)out_buf + 4,
953 (char *)midQ->resp_buf + 4,
956 dump_smb(out_buf, 92);
957 /* convert the length into a more usable form */
958 if ((receive_len > 24) &&
959 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
960 SECMODE_SIGN_ENABLED))) {
961 rc = cifs_verify_signature(out_buf,
963 midQ->sequence_number+1);
965 cERROR(1, "Unexpected SMB signature");
966 /* BB FIXME add code to kill session */
970 *pbytes_returned = out_buf->smb_buf_length;
972 /* BB special case reconnect tid and uid here? */
973 rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
975 /* convert ByteCount if necessary */
976 if (receive_len >= sizeof(struct smb_hdr) - 4
977 /* do not count RFC1001 header */ +
978 (2 * out_buf->WordCount) + 2 /* bcc */ )
979 put_bcc(get_bcc_le(out_buf), out_buf);
983 if (rstart && rc == -EACCES)