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/wait.h>
26 #include <linux/net.h>
27 #include <linux/delay.h>
28 #include <asm/uaccess.h>
29 #include <asm/processor.h>
30 #include <linux/mempool.h>
33 #include "cifsproto.h"
34 #include "cifs_debug.h"
36 extern mempool_t *cifs_mid_poolp;
37 extern struct kmem_cache *cifs_oplock_cachep;
39 static struct mid_q_entry *
40 AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
42 struct mid_q_entry *temp;
45 cERROR(1, ("Null TCP session in AllocMidQEntry"));
49 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
53 memset(temp, 0, sizeof(struct mid_q_entry));
54 temp->mid = smb_buffer->Mid; /* always LE */
55 temp->pid = current->pid;
56 temp->command = smb_buffer->Command;
57 cFYI(1, ("For smb_command %d", temp->command));
58 /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
59 /* when mid allocated can be before when sent */
60 temp->when_alloc = jiffies;
64 spin_lock(&GlobalMid_Lock);
65 list_add_tail(&temp->qhead, &server->pending_mid_q);
66 atomic_inc(&midCount);
67 temp->midState = MID_REQUEST_ALLOCATED;
68 spin_unlock(&GlobalMid_Lock);
73 DeleteMidQEntry(struct mid_q_entry *midEntry)
75 #ifdef CONFIG_CIFS_STATS2
78 spin_lock(&GlobalMid_Lock);
79 midEntry->midState = MID_FREE;
80 list_del(&midEntry->qhead);
81 atomic_dec(&midCount);
82 spin_unlock(&GlobalMid_Lock);
83 if (midEntry->largeBuf)
84 cifs_buf_release(midEntry->resp_buf);
86 cifs_small_buf_release(midEntry->resp_buf);
87 #ifdef CONFIG_CIFS_STATS2
89 /* commands taking longer than one second are indications that
90 something is wrong, unless it is quite a slow link or server */
91 if ((now - midEntry->when_alloc) > HZ) {
92 if ((cifsFYI & CIFS_TIMER) &&
93 (midEntry->command != SMB_COM_LOCKING_ANDX)) {
94 printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d",
95 midEntry->command, midEntry->mid);
96 printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
97 now - midEntry->when_alloc,
98 now - midEntry->when_sent,
99 now - midEntry->when_received);
103 mempool_free(midEntry, cifs_mid_poolp);
106 struct oplock_q_entry *
107 AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon)
109 struct oplock_q_entry *temp;
110 if ((pinode == NULL) || (tcon == NULL)) {
111 cERROR(1, ("Null parms passed to AllocOplockQEntry"));
114 temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
119 temp->pinode = pinode;
122 spin_lock(&GlobalMid_Lock);
123 list_add_tail(&temp->qhead, &GlobalOplock_Q);
124 spin_unlock(&GlobalMid_Lock);
130 void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry)
132 spin_lock(&GlobalMid_Lock);
133 /* should we check if list empty first? */
134 list_del(&oplockEntry->qhead);
135 spin_unlock(&GlobalMid_Lock);
136 kmem_cache_free(cifs_oplock_cachep, oplockEntry);
140 void DeleteTconOplockQEntries(struct cifsTconInfo *tcon)
142 struct oplock_q_entry *temp;
147 spin_lock(&GlobalMid_Lock);
148 list_for_each_entry(temp, &GlobalOplock_Q, qhead) {
149 if ((temp->tcon) && (temp->tcon == tcon)) {
150 list_del(&temp->qhead);
151 kmem_cache_free(cifs_oplock_cachep, temp);
154 spin_unlock(&GlobalMid_Lock);
158 smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
159 unsigned int smb_buf_length, struct sockaddr *sin, bool noblocksnd)
163 struct msghdr smb_msg;
165 unsigned len = smb_buf_length + 4;
168 return -ENOTSOCK; /* BB eventually add reconnect code here */
169 iov.iov_base = smb_buffer;
172 smb_msg.msg_name = sin;
173 smb_msg.msg_namelen = sizeof(struct sockaddr);
174 smb_msg.msg_control = NULL;
175 smb_msg.msg_controllen = 0;
177 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
179 smb_msg.msg_flags = MSG_NOSIGNAL;
181 /* smb header is converted in header_assemble. bcc and rest of SMB word
182 area, and byte area if necessary, is converted to littleendian in
183 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
184 Flags2 is converted in SendReceive */
186 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
187 cFYI(1, ("Sending smb of length %d", smb_buf_length));
188 dump_smb(smb_buffer, len);
191 rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len);
192 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
194 /* smaller timeout here than send2 since smaller size */
195 /* Although it may not be required, this also is smaller
199 ("sends on sock %p stuck for 7 seconds",
210 i = 0; /* reset i after each successful send */
217 cERROR(1, ("Error %d sending data on socket to server", rc));
222 /* Don't want to modify the buffer as a
223 side effect of this call. */
224 smb_buffer->smb_buf_length = smb_buf_length;
230 smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec,
231 struct sockaddr *sin, bool noblocksnd)
235 struct msghdr smb_msg;
236 struct smb_hdr *smb_buffer = iov[0].iov_base;
237 unsigned int len = iov[0].iov_len;
238 unsigned int total_len;
240 unsigned int smb_buf_length = smb_buffer->smb_buf_length;
241 struct socket *ssocket = server->ssocket;
244 return -ENOTSOCK; /* BB eventually add reconnect code here */
246 smb_msg.msg_name = sin;
247 smb_msg.msg_namelen = sizeof(struct sockaddr);
248 smb_msg.msg_control = NULL;
249 smb_msg.msg_controllen = 0;
251 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
253 smb_msg.msg_flags = MSG_NOSIGNAL;
255 /* smb header is converted in header_assemble. bcc and rest of SMB word
256 area, and byte area if necessary, is converted to littleendian in
257 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
258 Flags2 is converted in SendReceive */
262 for (i = 0; i < n_vec; i++)
263 total_len += iov[i].iov_len;
265 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
266 cFYI(1, ("Sending smb: total_len %d", total_len));
267 dump_smb(smb_buffer, len);
271 rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
272 n_vec - first_vec, total_len);
273 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
277 ("sends on sock %p stuck for 15 seconds",
288 if (rc == total_len) {
291 } else if (rc > total_len) {
292 cERROR(1, ("sent %d requested %d", rc, total_len));
296 /* should never happen, letting socket clear before
297 retrying is our only obvious option here */
298 cERROR(1, ("tcp sent no data"));
303 /* the line below resets i */
304 for (i = first_vec; i < n_vec; i++) {
305 if (iov[i].iov_len) {
306 if (rc > iov[i].iov_len) {
307 rc -= iov[i].iov_len;
310 iov[i].iov_base += rc;
311 iov[i].iov_len -= rc;
317 i = 0; /* in case we get ENOSPC on the next send */
320 if ((total_len > 0) && (total_len != smb_buf_length + 4)) {
321 cFYI(1, ("partial send (%d remaining), terminating session",
323 /* If we have only sent part of an SMB then the next SMB
324 could be taken as the remainder of this one. We need
325 to kill the socket so the server throws away the partial
327 server->tcpStatus = CifsNeedReconnect;
331 cERROR(1, ("Error %d sending data on socket to server", rc));
335 /* Don't want to modify the buffer as a
336 side effect of this call. */
337 smb_buffer->smb_buf_length = smb_buf_length;
342 static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op)
344 if (long_op == CIFS_ASYNC_OP) {
345 /* oplock breaks must not be held up */
346 atomic_inc(&ses->server->inFlight);
348 spin_lock(&GlobalMid_Lock);
350 if (atomic_read(&ses->server->inFlight) >=
352 spin_unlock(&GlobalMid_Lock);
353 #ifdef CONFIG_CIFS_STATS2
354 atomic_inc(&ses->server->num_waiters);
356 wait_event(ses->server->request_q,
357 atomic_read(&ses->server->inFlight)
359 #ifdef CONFIG_CIFS_STATS2
360 atomic_dec(&ses->server->num_waiters);
362 spin_lock(&GlobalMid_Lock);
364 if (ses->server->tcpStatus == CifsExiting) {
365 spin_unlock(&GlobalMid_Lock);
369 /* can not count locking commands against total
370 as they are allowed to block on server */
372 /* update # of requests on the wire to server */
373 if (long_op != CIFS_BLOCKING_OP)
374 atomic_inc(&ses->server->inFlight);
375 spin_unlock(&GlobalMid_Lock);
383 static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf,
384 struct mid_q_entry **ppmidQ)
386 if (ses->server->tcpStatus == CifsExiting) {
388 } else if (ses->server->tcpStatus == CifsNeedReconnect) {
389 cFYI(1, ("tcp session dead - return to caller to retry"));
391 } else if (ses->status != CifsGood) {
392 /* check if SMB session is bad because we are setting it up */
393 if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
394 (in_buf->Command != SMB_COM_NEGOTIATE))
396 /* else ok - we are setting up session */
398 *ppmidQ = AllocMidQEntry(in_buf, ses->server);
404 static int wait_for_response(struct cifsSesInfo *ses,
405 struct mid_q_entry *midQ,
406 unsigned long timeout,
407 unsigned long time_to_wait)
409 unsigned long curr_timeout;
412 curr_timeout = timeout + jiffies;
413 wait_event_timeout(ses->server->response_q,
414 midQ->midState != MID_REQUEST_SUBMITTED, timeout);
416 if (time_after(jiffies, curr_timeout) &&
417 (midQ->midState == MID_REQUEST_SUBMITTED) &&
418 ((ses->server->tcpStatus == CifsGood) ||
419 (ses->server->tcpStatus == CifsNew))) {
423 /* We timed out. Is the server still
425 spin_lock(&GlobalMid_Lock);
426 lrt = ses->server->lstrp;
427 spin_unlock(&GlobalMid_Lock);
429 /* Calculate time_to_wait past last receive time.
430 Although we prefer not to time out if the
431 server is still responding - we will time
432 out if the server takes more than 15 (or 45
433 or 180) seconds to respond to this request
434 and has not responded to any request from
435 other threads on the client within 10 seconds */
437 if (time_after(jiffies, lrt)) {
438 /* No replies for time_to_wait. */
439 cERROR(1, ("server not responding"));
451 * Send an SMB Request. No response info (other than return code)
452 * needs to be parsed.
454 * flags indicate the type of request buffer and how long to wait
455 * and whether to log NT STATUS code (error) before mapping it to POSIX error
459 SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
460 struct smb_hdr *in_buf, int flags)
466 iov[0].iov_base = (char *)in_buf;
467 iov[0].iov_len = in_buf->smb_buf_length + 4;
468 flags |= CIFS_NO_RESP;
469 rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
470 cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc));
476 SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
477 struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
482 unsigned int receive_len;
483 unsigned long timeout;
484 struct mid_q_entry *midQ;
485 struct smb_hdr *in_buf = iov[0].iov_base;
487 long_op = flags & CIFS_TIMEOUT_MASK;
489 *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
491 if ((ses == NULL) || (ses->server == NULL)) {
492 cifs_small_buf_release(in_buf);
493 cERROR(1, ("Null session"));
497 if (ses->server->tcpStatus == CifsExiting) {
498 cifs_small_buf_release(in_buf);
502 /* Ensure that we do not send more than 50 overlapping requests
503 to the same server. We may make this configurable later or
506 rc = wait_for_free_request(ses, long_op);
508 cifs_small_buf_release(in_buf);
512 /* make sure that we sign in the same order that we send on this socket
513 and avoid races inside tcp sendmsg code that could cause corruption
516 mutex_lock(&ses->server->srv_mutex);
518 rc = allocate_mid(ses, in_buf, &midQ);
520 mutex_unlock(&ses->server->srv_mutex);
521 cifs_small_buf_release(in_buf);
522 /* Update # of requests on wire to server */
523 atomic_dec(&ses->server->inFlight);
524 wake_up(&ses->server->request_q);
527 rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
529 midQ->midState = MID_REQUEST_SUBMITTED;
530 #ifdef CONFIG_CIFS_STATS2
531 atomic_inc(&ses->server->inSend);
533 rc = smb_send2(ses->server, iov, n_vec,
534 (struct sockaddr *) &(ses->server->addr.sockAddr),
535 ses->server->noblocksnd);
536 #ifdef CONFIG_CIFS_STATS2
537 atomic_dec(&ses->server->inSend);
538 midQ->when_sent = jiffies;
541 mutex_unlock(&ses->server->srv_mutex);
542 cifs_small_buf_release(in_buf);
547 if (long_op == CIFS_STD_OP)
549 else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */
551 else if (long_op == CIFS_LONG_OP)
552 timeout = 45 * HZ; /* should be greater than
553 servers oplock break timeout (about 43 seconds) */
554 else if (long_op == CIFS_ASYNC_OP)
556 else if (long_op == CIFS_BLOCKING_OP)
557 timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */
559 cERROR(1, ("unknown timeout flag %d", long_op));
564 /* wait for 15 seconds or until woken up due to response arriving or
565 due to last connection to this server being unmounted */
566 if (signal_pending(current)) {
567 /* if signal pending do not hold up user for full smb timeout
568 but we still give response a chance to complete */
572 /* No user interrupts in wait - wreaks havoc with performance */
573 wait_for_response(ses, midQ, timeout, 10 * HZ);
575 spin_lock(&GlobalMid_Lock);
576 if (midQ->resp_buf) {
577 spin_unlock(&GlobalMid_Lock);
578 receive_len = midQ->resp_buf->smb_buf_length;
580 cERROR(1, ("No response to cmd %d mid %d",
581 midQ->command, midQ->mid));
582 if (midQ->midState == MID_REQUEST_SUBMITTED) {
583 if (ses->server->tcpStatus == CifsExiting)
586 ses->server->tcpStatus = CifsNeedReconnect;
587 midQ->midState = MID_RETRY_NEEDED;
591 if (rc != -EHOSTDOWN) {
592 if (midQ->midState == MID_RETRY_NEEDED) {
594 cFYI(1, ("marking request for retry"));
599 spin_unlock(&GlobalMid_Lock);
600 DeleteMidQEntry(midQ);
601 /* Update # of requests on wire to server */
602 atomic_dec(&ses->server->inFlight);
603 wake_up(&ses->server->request_q);
607 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
608 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
611 } else { /* rcvd frame is ok */
612 if (midQ->resp_buf &&
613 (midQ->midState == MID_RESPONSE_RECEIVED)) {
615 iov[0].iov_base = (char *)midQ->resp_buf;
617 *pRespBufType = CIFS_LARGE_BUFFER;
619 *pRespBufType = CIFS_SMALL_BUFFER;
620 iov[0].iov_len = receive_len + 4;
622 dump_smb(midQ->resp_buf, 80);
623 /* convert the length into a more usable form */
624 if ((receive_len > 24) &&
625 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
626 SECMODE_SIGN_ENABLED))) {
627 rc = cifs_verify_signature(midQ->resp_buf,
628 &ses->server->mac_signing_key,
629 midQ->sequence_number+1);
631 cERROR(1, ("Unexpected SMB signature"));
632 /* BB FIXME add code to kill session */
636 /* BB special case reconnect tid and uid here? */
637 rc = map_smb_to_linux_error(midQ->resp_buf,
638 flags & CIFS_LOG_ERROR);
640 /* convert ByteCount if necessary */
641 if (receive_len >= sizeof(struct smb_hdr) - 4
642 /* do not count RFC1001 header */ +
643 (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
644 BCC(midQ->resp_buf) =
645 le16_to_cpu(BCC_LE(midQ->resp_buf));
646 if ((flags & CIFS_NO_RESP) == 0)
647 midQ->resp_buf = NULL; /* mark it so buf will
652 cFYI(1, ("Bad MID state?"));
657 DeleteMidQEntry(midQ);
658 atomic_dec(&ses->server->inFlight);
659 wake_up(&ses->server->request_q);
665 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
666 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
667 int *pbytes_returned, const int long_op)
670 unsigned int receive_len;
671 unsigned long timeout;
672 struct mid_q_entry *midQ;
675 cERROR(1, ("Null smb session"));
678 if (ses->server == NULL) {
679 cERROR(1, ("Null tcp session"));
683 if (ses->server->tcpStatus == CifsExiting)
686 /* Ensure that we do not send more than 50 overlapping requests
687 to the same server. We may make this configurable later or
690 rc = wait_for_free_request(ses, long_op);
694 /* make sure that we sign in the same order that we send on this socket
695 and avoid races inside tcp sendmsg code that could cause corruption
698 mutex_lock(&ses->server->srv_mutex);
700 rc = allocate_mid(ses, in_buf, &midQ);
702 mutex_unlock(&ses->server->srv_mutex);
703 /* Update # of requests on wire to server */
704 atomic_dec(&ses->server->inFlight);
705 wake_up(&ses->server->request_q);
709 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
710 cERROR(1, ("Illegal length, greater than maximum frame, %d",
711 in_buf->smb_buf_length));
712 DeleteMidQEntry(midQ);
713 mutex_unlock(&ses->server->srv_mutex);
714 /* Update # of requests on wire to server */
715 atomic_dec(&ses->server->inFlight);
716 wake_up(&ses->server->request_q);
720 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
722 midQ->midState = MID_REQUEST_SUBMITTED;
723 #ifdef CONFIG_CIFS_STATS2
724 atomic_inc(&ses->server->inSend);
726 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
727 (struct sockaddr *) &(ses->server->addr.sockAddr),
728 ses->server->noblocksnd);
729 #ifdef CONFIG_CIFS_STATS2
730 atomic_dec(&ses->server->inSend);
731 midQ->when_sent = jiffies;
733 mutex_unlock(&ses->server->srv_mutex);
738 if (long_op == CIFS_STD_OP)
740 /* wait for 15 seconds or until woken up due to response arriving or
741 due to last connection to this server being unmounted */
742 else if (long_op == CIFS_ASYNC_OP)
744 else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */
746 else if (long_op == CIFS_LONG_OP)
747 timeout = 45 * HZ; /* should be greater than
748 servers oplock break timeout (about 43 seconds) */
749 else if (long_op == CIFS_BLOCKING_OP)
750 timeout = 0x7FFFFFFF; /* large but no so large as to wrap */
752 cERROR(1, ("unknown timeout flag %d", long_op));
757 if (signal_pending(current)) {
758 /* if signal pending do not hold up user for full smb timeout
759 but we still give response a chance to complete */
763 /* No user interrupts in wait - wreaks havoc with performance */
764 wait_for_response(ses, midQ, timeout, 10 * HZ);
766 spin_lock(&GlobalMid_Lock);
767 if (midQ->resp_buf) {
768 spin_unlock(&GlobalMid_Lock);
769 receive_len = midQ->resp_buf->smb_buf_length;
771 cERROR(1, ("No response for cmd %d mid %d",
772 midQ->command, midQ->mid));
773 if (midQ->midState == MID_REQUEST_SUBMITTED) {
774 if (ses->server->tcpStatus == CifsExiting)
777 ses->server->tcpStatus = CifsNeedReconnect;
778 midQ->midState = MID_RETRY_NEEDED;
782 if (rc != -EHOSTDOWN) {
783 if (midQ->midState == MID_RETRY_NEEDED) {
785 cFYI(1, ("marking request for retry"));
790 spin_unlock(&GlobalMid_Lock);
791 DeleteMidQEntry(midQ);
792 /* Update # of requests on wire to server */
793 atomic_dec(&ses->server->inFlight);
794 wake_up(&ses->server->request_q);
798 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
799 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
802 } else { /* rcvd frame is ok */
804 if (midQ->resp_buf && out_buf
805 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
806 out_buf->smb_buf_length = receive_len;
807 memcpy((char *)out_buf + 4,
808 (char *)midQ->resp_buf + 4,
811 dump_smb(out_buf, 92);
812 /* convert the length into a more usable form */
813 if ((receive_len > 24) &&
814 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
815 SECMODE_SIGN_ENABLED))) {
816 rc = cifs_verify_signature(out_buf,
817 &ses->server->mac_signing_key,
818 midQ->sequence_number+1);
820 cERROR(1, ("Unexpected SMB signature"));
821 /* BB FIXME add code to kill session */
825 *pbytes_returned = out_buf->smb_buf_length;
827 /* BB special case reconnect tid and uid here? */
828 rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
830 /* convert ByteCount if necessary */
831 if (receive_len >= sizeof(struct smb_hdr) - 4
832 /* do not count RFC1001 header */ +
833 (2 * out_buf->WordCount) + 2 /* bcc */ )
834 BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
837 cERROR(1, ("Bad MID state?"));
842 DeleteMidQEntry(midQ);
843 atomic_dec(&ses->server->inFlight);
844 wake_up(&ses->server->request_q);
849 /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */
852 send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf,
853 struct mid_q_entry *midQ)
856 struct cifsSesInfo *ses = tcon->ses;
857 __u16 mid = in_buf->Mid;
859 header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0);
861 mutex_lock(&ses->server->srv_mutex);
862 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
864 mutex_unlock(&ses->server->srv_mutex);
867 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
868 (struct sockaddr *) &(ses->server->addr.sockAddr),
869 ses->server->noblocksnd);
870 mutex_unlock(&ses->server->srv_mutex);
874 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
875 blocking lock to return. */
878 send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
879 struct smb_hdr *in_buf,
880 struct smb_hdr *out_buf)
883 struct cifsSesInfo *ses = tcon->ses;
884 LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
886 /* We just modify the current in_buf to change
887 the type of lock from LOCKING_ANDX_SHARED_LOCK
888 or LOCKING_ANDX_EXCLUSIVE_LOCK to
889 LOCKING_ANDX_CANCEL_LOCK. */
891 pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
893 pSMB->hdr.Mid = GetNextMid(ses->server);
895 return SendReceive(xid, ses, in_buf, out_buf,
896 &bytes_returned, CIFS_STD_OP);
900 SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
901 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
902 int *pbytes_returned)
906 unsigned int receive_len;
907 struct mid_q_entry *midQ;
908 struct cifsSesInfo *ses;
910 if (tcon == NULL || tcon->ses == NULL) {
911 cERROR(1, ("Null smb session"));
916 if (ses->server == NULL) {
917 cERROR(1, ("Null tcp session"));
921 if (ses->server->tcpStatus == CifsExiting)
924 /* Ensure that we do not send more than 50 overlapping requests
925 to the same server. We may make this configurable later or
928 rc = wait_for_free_request(ses, CIFS_BLOCKING_OP);
932 /* make sure that we sign in the same order that we send on this socket
933 and avoid races inside tcp sendmsg code that could cause corruption
936 mutex_lock(&ses->server->srv_mutex);
938 rc = allocate_mid(ses, in_buf, &midQ);
940 mutex_unlock(&ses->server->srv_mutex);
944 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
945 mutex_unlock(&ses->server->srv_mutex);
946 cERROR(1, ("Illegal length, greater than maximum frame, %d",
947 in_buf->smb_buf_length));
948 DeleteMidQEntry(midQ);
952 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
954 midQ->midState = MID_REQUEST_SUBMITTED;
955 #ifdef CONFIG_CIFS_STATS2
956 atomic_inc(&ses->server->inSend);
958 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
959 (struct sockaddr *) &(ses->server->addr.sockAddr),
960 ses->server->noblocksnd);
961 #ifdef CONFIG_CIFS_STATS2
962 atomic_dec(&ses->server->inSend);
963 midQ->when_sent = jiffies;
965 mutex_unlock(&ses->server->srv_mutex);
968 DeleteMidQEntry(midQ);
972 /* Wait for a reply - allow signals to interrupt. */
973 rc = wait_event_interruptible(ses->server->response_q,
974 (!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
975 ((ses->server->tcpStatus != CifsGood) &&
976 (ses->server->tcpStatus != CifsNew)));
978 /* Were we interrupted by a signal ? */
979 if ((rc == -ERESTARTSYS) &&
980 (midQ->midState == MID_REQUEST_SUBMITTED) &&
981 ((ses->server->tcpStatus == CifsGood) ||
982 (ses->server->tcpStatus == CifsNew))) {
984 if (in_buf->Command == SMB_COM_TRANSACTION2) {
985 /* POSIX lock. We send a NT_CANCEL SMB to cause the
986 blocking lock to return. */
988 rc = send_nt_cancel(tcon, in_buf, midQ);
990 DeleteMidQEntry(midQ);
994 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
995 to cause the blocking lock to return. */
997 rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
999 /* If we get -ENOLCK back the lock may have
1000 already been removed. Don't exit in this case. */
1001 if (rc && rc != -ENOLCK) {
1002 DeleteMidQEntry(midQ);
1007 /* Wait 5 seconds for the response. */
1008 if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) {
1009 /* We got the response - restart system call. */
1014 spin_lock(&GlobalMid_Lock);
1015 if (midQ->resp_buf) {
1016 spin_unlock(&GlobalMid_Lock);
1017 receive_len = midQ->resp_buf->smb_buf_length;
1019 cERROR(1, ("No response for cmd %d mid %d",
1020 midQ->command, midQ->mid));
1021 if (midQ->midState == MID_REQUEST_SUBMITTED) {
1022 if (ses->server->tcpStatus == CifsExiting)
1025 ses->server->tcpStatus = CifsNeedReconnect;
1026 midQ->midState = MID_RETRY_NEEDED;
1030 if (rc != -EHOSTDOWN) {
1031 if (midQ->midState == MID_RETRY_NEEDED) {
1033 cFYI(1, ("marking request for retry"));
1038 spin_unlock(&GlobalMid_Lock);
1039 DeleteMidQEntry(midQ);
1043 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
1044 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
1047 } else { /* rcvd frame is ok */
1049 if (midQ->resp_buf && out_buf
1050 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
1051 out_buf->smb_buf_length = receive_len;
1052 memcpy((char *)out_buf + 4,
1053 (char *)midQ->resp_buf + 4,
1056 dump_smb(out_buf, 92);
1057 /* convert the length into a more usable form */
1058 if ((receive_len > 24) &&
1059 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
1060 SECMODE_SIGN_ENABLED))) {
1061 rc = cifs_verify_signature(out_buf,
1062 &ses->server->mac_signing_key,
1063 midQ->sequence_number+1);
1065 cERROR(1, ("Unexpected SMB signature"));
1066 /* BB FIXME add code to kill session */
1070 *pbytes_returned = out_buf->smb_buf_length;
1072 /* BB special case reconnect tid and uid here? */
1073 rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
1075 /* convert ByteCount if necessary */
1076 if (receive_len >= sizeof(struct smb_hdr) - 4
1077 /* do not count RFC1001 header */ +
1078 (2 * out_buf->WordCount) + 2 /* bcc */ )
1079 BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
1082 cERROR(1, ("Bad MID state?"));
1085 DeleteMidQEntry(midQ);
1086 if (rstart && rc == -EACCES)
1087 return -ERESTARTSYS;