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);
350 spin_lock(&GlobalMid_Lock);
352 if (atomic_read(&ses->server->inFlight) >=
354 spin_unlock(&GlobalMid_Lock);
355 #ifdef CONFIG_CIFS_STATS2
356 atomic_inc(&ses->server->num_waiters);
358 wait_event(ses->server->request_q,
359 atomic_read(&ses->server->inFlight)
361 #ifdef CONFIG_CIFS_STATS2
362 atomic_dec(&ses->server->num_waiters);
364 spin_lock(&GlobalMid_Lock);
366 if (ses->server->tcpStatus == CifsExiting) {
367 spin_unlock(&GlobalMid_Lock);
371 /* can not count locking commands against total
372 as they are allowed to block on server */
374 /* update # of requests on the wire to server */
375 if (long_op != CIFS_BLOCKING_OP)
376 atomic_inc(&ses->server->inFlight);
377 spin_unlock(&GlobalMid_Lock);
384 static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf,
385 struct mid_q_entry **ppmidQ)
387 if (ses->server->tcpStatus == CifsExiting) {
391 if (ses->server->tcpStatus == CifsNeedReconnect) {
392 cFYI(1, ("tcp session dead - return to caller to retry"));
396 if (ses->status != CifsGood) {
397 /* check if SMB session is bad because we are setting it up */
398 if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
399 (in_buf->Command != SMB_COM_NEGOTIATE))
401 /* else ok - we are setting up session */
403 *ppmidQ = AllocMidQEntry(in_buf, ses->server);
409 static int wait_for_response(struct cifsSesInfo *ses,
410 struct mid_q_entry *midQ,
411 unsigned long timeout,
412 unsigned long time_to_wait)
414 unsigned long curr_timeout;
417 curr_timeout = timeout + jiffies;
418 wait_event_timeout(ses->server->response_q,
419 midQ->midState != MID_REQUEST_SUBMITTED, timeout);
421 if (time_after(jiffies, curr_timeout) &&
422 (midQ->midState == MID_REQUEST_SUBMITTED) &&
423 ((ses->server->tcpStatus == CifsGood) ||
424 (ses->server->tcpStatus == CifsNew))) {
428 /* We timed out. Is the server still
430 spin_lock(&GlobalMid_Lock);
431 lrt = ses->server->lstrp;
432 spin_unlock(&GlobalMid_Lock);
434 /* Calculate time_to_wait past last receive time.
435 Although we prefer not to time out if the
436 server is still responding - we will time
437 out if the server takes more than 15 (or 45
438 or 180) seconds to respond to this request
439 and has not responded to any request from
440 other threads on the client within 10 seconds */
442 if (time_after(jiffies, lrt)) {
443 /* No replies for time_to_wait. */
444 cERROR(1, ("server not responding"));
456 * Send an SMB Request. No response info (other than return code)
457 * needs to be parsed.
459 * flags indicate the type of request buffer and how long to wait
460 * and whether to log NT STATUS code (error) before mapping it to POSIX error
464 SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
465 struct smb_hdr *in_buf, int flags)
471 iov[0].iov_base = (char *)in_buf;
472 iov[0].iov_len = in_buf->smb_buf_length + 4;
473 flags |= CIFS_NO_RESP;
474 rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
475 cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc));
481 SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
482 struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
487 unsigned int receive_len;
488 unsigned long timeout;
489 struct mid_q_entry *midQ;
490 struct smb_hdr *in_buf = iov[0].iov_base;
492 long_op = flags & CIFS_TIMEOUT_MASK;
494 *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
496 if ((ses == NULL) || (ses->server == NULL)) {
497 cifs_small_buf_release(in_buf);
498 cERROR(1, ("Null session"));
502 if (ses->server->tcpStatus == CifsExiting) {
503 cifs_small_buf_release(in_buf);
507 /* Ensure that we do not send more than 50 overlapping requests
508 to the same server. We may make this configurable later or
511 rc = wait_for_free_request(ses, long_op);
513 cifs_small_buf_release(in_buf);
517 /* make sure that we sign in the same order that we send on this socket
518 and avoid races inside tcp sendmsg code that could cause corruption
521 mutex_lock(&ses->server->srv_mutex);
523 rc = allocate_mid(ses, in_buf, &midQ);
525 mutex_unlock(&ses->server->srv_mutex);
526 cifs_small_buf_release(in_buf);
527 /* Update # of requests on wire to server */
528 atomic_dec(&ses->server->inFlight);
529 wake_up(&ses->server->request_q);
532 rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
534 mutex_unlock(&ses->server->srv_mutex);
535 cifs_small_buf_release(in_buf);
539 midQ->midState = MID_REQUEST_SUBMITTED;
540 #ifdef CONFIG_CIFS_STATS2
541 atomic_inc(&ses->server->inSend);
543 rc = smb_send2(ses->server, iov, n_vec,
544 (struct sockaddr *) &(ses->server->addr.sockAddr),
545 ses->server->noblocksnd);
546 #ifdef CONFIG_CIFS_STATS2
547 atomic_dec(&ses->server->inSend);
548 midQ->when_sent = jiffies;
551 mutex_unlock(&ses->server->srv_mutex);
552 cifs_small_buf_release(in_buf);
557 if (long_op == CIFS_STD_OP)
559 else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */
561 else if (long_op == CIFS_LONG_OP)
562 timeout = 45 * HZ; /* should be greater than
563 servers oplock break timeout (about 43 seconds) */
564 else if (long_op == CIFS_ASYNC_OP)
566 else if (long_op == CIFS_BLOCKING_OP)
567 timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */
569 cERROR(1, ("unknown timeout flag %d", long_op));
574 /* wait for 15 seconds or until woken up due to response arriving or
575 due to last connection to this server being unmounted */
576 if (signal_pending(current)) {
577 /* if signal pending do not hold up user for full smb timeout
578 but we still give response a chance to complete */
582 /* No user interrupts in wait - wreaks havoc with performance */
583 wait_for_response(ses, midQ, timeout, 10 * HZ);
585 spin_lock(&GlobalMid_Lock);
587 if (midQ->resp_buf == NULL) {
588 cERROR(1, ("No response to cmd %d mid %d",
589 midQ->command, midQ->mid));
590 if (midQ->midState == MID_REQUEST_SUBMITTED) {
591 if (ses->server->tcpStatus == CifsExiting)
594 ses->server->tcpStatus = CifsNeedReconnect;
595 midQ->midState = MID_RETRY_NEEDED;
599 if (rc != -EHOSTDOWN) {
600 if (midQ->midState == MID_RETRY_NEEDED) {
602 cFYI(1, ("marking request for retry"));
607 spin_unlock(&GlobalMid_Lock);
608 DeleteMidQEntry(midQ);
609 /* Update # of requests on wire to server */
610 atomic_dec(&ses->server->inFlight);
611 wake_up(&ses->server->request_q);
615 spin_unlock(&GlobalMid_Lock);
616 receive_len = midQ->resp_buf->smb_buf_length;
618 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
619 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
625 /* rcvd frame is ok */
627 if (midQ->resp_buf &&
628 (midQ->midState == MID_RESPONSE_RECEIVED)) {
630 iov[0].iov_base = (char *)midQ->resp_buf;
632 *pRespBufType = CIFS_LARGE_BUFFER;
634 *pRespBufType = CIFS_SMALL_BUFFER;
635 iov[0].iov_len = receive_len + 4;
637 dump_smb(midQ->resp_buf, 80);
638 /* convert the length into a more usable form */
639 if ((receive_len > 24) &&
640 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
641 SECMODE_SIGN_ENABLED))) {
642 rc = cifs_verify_signature(midQ->resp_buf,
643 &ses->server->mac_signing_key,
644 midQ->sequence_number+1);
646 cERROR(1, ("Unexpected SMB signature"));
647 /* BB FIXME add code to kill session */
651 /* BB special case reconnect tid and uid here? */
652 rc = map_smb_to_linux_error(midQ->resp_buf,
653 flags & CIFS_LOG_ERROR);
655 /* convert ByteCount if necessary */
656 if (receive_len >= sizeof(struct smb_hdr) - 4
657 /* do not count RFC1001 header */ +
658 (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
659 BCC(midQ->resp_buf) =
660 le16_to_cpu(BCC_LE(midQ->resp_buf));
661 if ((flags & CIFS_NO_RESP) == 0)
662 midQ->resp_buf = NULL; /* mark it so buf will
667 cFYI(1, ("Bad MID state?"));
671 DeleteMidQEntry(midQ);
672 atomic_dec(&ses->server->inFlight);
673 wake_up(&ses->server->request_q);
679 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
680 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
681 int *pbytes_returned, const int long_op)
684 unsigned int receive_len;
685 unsigned long timeout;
686 struct mid_q_entry *midQ;
689 cERROR(1, ("Null smb session"));
692 if (ses->server == NULL) {
693 cERROR(1, ("Null tcp session"));
697 if (ses->server->tcpStatus == CifsExiting)
700 /* Ensure that we do not send more than 50 overlapping requests
701 to the same server. We may make this configurable later or
704 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
705 cERROR(1, ("Illegal length, greater than maximum frame, %d",
706 in_buf->smb_buf_length));
710 rc = wait_for_free_request(ses, long_op);
714 /* make sure that we sign in the same order that we send on this socket
715 and avoid races inside tcp sendmsg code that could cause corruption
718 mutex_lock(&ses->server->srv_mutex);
720 rc = allocate_mid(ses, in_buf, &midQ);
722 mutex_unlock(&ses->server->srv_mutex);
723 /* Update # of requests on wire to server */
724 atomic_dec(&ses->server->inFlight);
725 wake_up(&ses->server->request_q);
729 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
731 mutex_unlock(&ses->server->srv_mutex);
735 midQ->midState = MID_REQUEST_SUBMITTED;
736 #ifdef CONFIG_CIFS_STATS2
737 atomic_inc(&ses->server->inSend);
739 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
740 (struct sockaddr *) &(ses->server->addr.sockAddr),
741 ses->server->noblocksnd);
742 #ifdef CONFIG_CIFS_STATS2
743 atomic_dec(&ses->server->inSend);
744 midQ->when_sent = jiffies;
746 mutex_unlock(&ses->server->srv_mutex);
751 if (long_op == CIFS_STD_OP)
753 /* wait for 15 seconds or until woken up due to response arriving or
754 due to last connection to this server being unmounted */
755 else if (long_op == CIFS_ASYNC_OP)
757 else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */
759 else if (long_op == CIFS_LONG_OP)
760 timeout = 45 * HZ; /* should be greater than
761 servers oplock break timeout (about 43 seconds) */
762 else if (long_op == CIFS_BLOCKING_OP)
763 timeout = 0x7FFFFFFF; /* large but no so large as to wrap */
765 cERROR(1, ("unknown timeout flag %d", long_op));
770 if (signal_pending(current)) {
771 /* if signal pending do not hold up user for full smb timeout
772 but we still give response a chance to complete */
776 /* No user interrupts in wait - wreaks havoc with performance */
777 wait_for_response(ses, midQ, timeout, 10 * HZ);
779 spin_lock(&GlobalMid_Lock);
780 if (midQ->resp_buf == NULL) {
781 cERROR(1, ("No response for cmd %d mid %d",
782 midQ->command, midQ->mid));
783 if (midQ->midState == MID_REQUEST_SUBMITTED) {
784 if (ses->server->tcpStatus == CifsExiting)
787 ses->server->tcpStatus = CifsNeedReconnect;
788 midQ->midState = MID_RETRY_NEEDED;
792 if (rc != -EHOSTDOWN) {
793 if (midQ->midState == MID_RETRY_NEEDED) {
795 cFYI(1, ("marking request for retry"));
800 spin_unlock(&GlobalMid_Lock);
801 DeleteMidQEntry(midQ);
802 /* Update # of requests on wire to server */
803 atomic_dec(&ses->server->inFlight);
804 wake_up(&ses->server->request_q);
808 spin_unlock(&GlobalMid_Lock);
809 receive_len = midQ->resp_buf->smb_buf_length;
811 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
812 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
818 /* rcvd frame is ok */
820 if (midQ->resp_buf && out_buf
821 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
822 out_buf->smb_buf_length = receive_len;
823 memcpy((char *)out_buf + 4,
824 (char *)midQ->resp_buf + 4,
827 dump_smb(out_buf, 92);
828 /* convert the length into a more usable form */
829 if ((receive_len > 24) &&
830 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
831 SECMODE_SIGN_ENABLED))) {
832 rc = cifs_verify_signature(out_buf,
833 &ses->server->mac_signing_key,
834 midQ->sequence_number+1);
836 cERROR(1, ("Unexpected SMB signature"));
837 /* BB FIXME add code to kill session */
841 *pbytes_returned = out_buf->smb_buf_length;
843 /* BB special case reconnect tid and uid here? */
844 rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
846 /* convert ByteCount if necessary */
847 if (receive_len >= sizeof(struct smb_hdr) - 4
848 /* do not count RFC1001 header */ +
849 (2 * out_buf->WordCount) + 2 /* bcc */ )
850 BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
853 cERROR(1, ("Bad MID state?"));
857 DeleteMidQEntry(midQ);
858 atomic_dec(&ses->server->inFlight);
859 wake_up(&ses->server->request_q);
864 /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */
867 send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf,
868 struct mid_q_entry *midQ)
871 struct cifsSesInfo *ses = tcon->ses;
872 __u16 mid = in_buf->Mid;
874 header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0);
876 mutex_lock(&ses->server->srv_mutex);
877 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
879 mutex_unlock(&ses->server->srv_mutex);
882 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
883 (struct sockaddr *) &(ses->server->addr.sockAddr),
884 ses->server->noblocksnd);
885 mutex_unlock(&ses->server->srv_mutex);
889 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
890 blocking lock to return. */
893 send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
894 struct smb_hdr *in_buf,
895 struct smb_hdr *out_buf)
898 struct cifsSesInfo *ses = tcon->ses;
899 LOCK_REQ *pSMB = (LOCK_REQ *)in_buf;
901 /* We just modify the current in_buf to change
902 the type of lock from LOCKING_ANDX_SHARED_LOCK
903 or LOCKING_ANDX_EXCLUSIVE_LOCK to
904 LOCKING_ANDX_CANCEL_LOCK. */
906 pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES;
908 pSMB->hdr.Mid = GetNextMid(ses->server);
910 return SendReceive(xid, ses, in_buf, out_buf,
911 &bytes_returned, CIFS_STD_OP);
915 SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
916 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
917 int *pbytes_returned)
921 unsigned int receive_len;
922 struct mid_q_entry *midQ;
923 struct cifsSesInfo *ses;
925 if (tcon == NULL || tcon->ses == NULL) {
926 cERROR(1, ("Null smb session"));
931 if (ses->server == NULL) {
932 cERROR(1, ("Null tcp session"));
936 if (ses->server->tcpStatus == CifsExiting)
939 /* Ensure that we do not send more than 50 overlapping requests
940 to the same server. We may make this configurable later or
943 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
944 cERROR(1, ("Illegal length, greater than maximum frame, %d",
945 in_buf->smb_buf_length));
949 rc = wait_for_free_request(ses, CIFS_BLOCKING_OP);
953 /* make sure that we sign in the same order that we send on this socket
954 and avoid races inside tcp sendmsg code that could cause corruption
957 mutex_lock(&ses->server->srv_mutex);
959 rc = allocate_mid(ses, in_buf, &midQ);
961 mutex_unlock(&ses->server->srv_mutex);
965 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
967 DeleteMidQEntry(midQ);
968 mutex_unlock(&ses->server->srv_mutex);
972 midQ->midState = MID_REQUEST_SUBMITTED;
973 #ifdef CONFIG_CIFS_STATS2
974 atomic_inc(&ses->server->inSend);
976 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
977 (struct sockaddr *) &(ses->server->addr.sockAddr),
978 ses->server->noblocksnd);
979 #ifdef CONFIG_CIFS_STATS2
980 atomic_dec(&ses->server->inSend);
981 midQ->when_sent = jiffies;
983 mutex_unlock(&ses->server->srv_mutex);
986 DeleteMidQEntry(midQ);
990 /* Wait for a reply - allow signals to interrupt. */
991 rc = wait_event_interruptible(ses->server->response_q,
992 (!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
993 ((ses->server->tcpStatus != CifsGood) &&
994 (ses->server->tcpStatus != CifsNew)));
996 /* Were we interrupted by a signal ? */
997 if ((rc == -ERESTARTSYS) &&
998 (midQ->midState == MID_REQUEST_SUBMITTED) &&
999 ((ses->server->tcpStatus == CifsGood) ||
1000 (ses->server->tcpStatus == CifsNew))) {
1002 if (in_buf->Command == SMB_COM_TRANSACTION2) {
1003 /* POSIX lock. We send a NT_CANCEL SMB to cause the
1004 blocking lock to return. */
1006 rc = send_nt_cancel(tcon, in_buf, midQ);
1008 DeleteMidQEntry(midQ);
1012 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
1013 to cause the blocking lock to return. */
1015 rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
1017 /* If we get -ENOLCK back the lock may have
1018 already been removed. Don't exit in this case. */
1019 if (rc && rc != -ENOLCK) {
1020 DeleteMidQEntry(midQ);
1025 /* Wait 5 seconds for the response. */
1026 if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) {
1027 /* We got the response - restart system call. */
1032 spin_lock(&GlobalMid_Lock);
1033 if (midQ->resp_buf) {
1034 spin_unlock(&GlobalMid_Lock);
1035 receive_len = midQ->resp_buf->smb_buf_length;
1037 cERROR(1, ("No response for cmd %d mid %d",
1038 midQ->command, midQ->mid));
1039 if (midQ->midState == MID_REQUEST_SUBMITTED) {
1040 if (ses->server->tcpStatus == CifsExiting)
1043 ses->server->tcpStatus = CifsNeedReconnect;
1044 midQ->midState = MID_RETRY_NEEDED;
1048 if (rc != -EHOSTDOWN) {
1049 if (midQ->midState == MID_RETRY_NEEDED) {
1051 cFYI(1, ("marking request for retry"));
1056 spin_unlock(&GlobalMid_Lock);
1057 DeleteMidQEntry(midQ);
1061 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
1062 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
1068 /* rcvd frame is ok */
1070 if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) {
1072 cERROR(1, ("Bad MID state?"));
1076 out_buf->smb_buf_length = receive_len;
1077 memcpy((char *)out_buf + 4,
1078 (char *)midQ->resp_buf + 4,
1081 dump_smb(out_buf, 92);
1082 /* convert the length into a more usable form */
1083 if ((receive_len > 24) &&
1084 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
1085 SECMODE_SIGN_ENABLED))) {
1086 rc = cifs_verify_signature(out_buf,
1087 &ses->server->mac_signing_key,
1088 midQ->sequence_number+1);
1090 cERROR(1, ("Unexpected SMB signature"));
1091 /* BB FIXME add code to kill session */
1095 *pbytes_returned = out_buf->smb_buf_length;
1097 /* BB special case reconnect tid and uid here? */
1098 rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
1100 /* convert ByteCount if necessary */
1101 if (receive_len >= sizeof(struct smb_hdr) - 4
1102 /* do not count RFC1001 header */ +
1103 (2 * out_buf->WordCount) + 2 /* bcc */ )
1104 BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf));
1107 DeleteMidQEntry(midQ);
1108 if (rstart && rc == -EACCES)
1109 return -ERESTARTSYS;