4 * Copyright (C) International Business Machines Corp., 2002,2005
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/list.h>
24 #include <linux/wait.h>
25 #include <linux/net.h>
26 #include <linux/delay.h>
27 #include <asm/uaccess.h>
28 #include <asm/processor.h>
29 #include <linux/mempool.h>
32 #include "cifsproto.h"
33 #include "cifs_debug.h"
35 extern mempool_t *cifs_mid_poolp;
36 extern kmem_cache_t *cifs_oplock_cachep;
38 static struct mid_q_entry *
39 AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses)
41 struct mid_q_entry *temp;
44 cERROR(1, ("Null session passed in to AllocMidQEntry"));
47 if (ses->server == NULL) {
48 cERROR(1, ("Null TCP session in AllocMidQEntry"));
52 temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp,
53 SLAB_KERNEL | SLAB_NOFS);
57 memset(temp, 0, sizeof (struct mid_q_entry));
58 temp->mid = smb_buffer->Mid; /* always LE */
59 temp->pid = current->pid;
60 temp->command = smb_buffer->Command;
61 cFYI(1, ("For smb_command %d", temp->command));
62 do_gettimeofday(&temp->when_sent);
67 spin_lock(&GlobalMid_Lock);
68 list_add_tail(&temp->qhead, &ses->server->pending_mid_q);
69 atomic_inc(&midCount);
70 temp->midState = MID_REQUEST_ALLOCATED;
71 spin_unlock(&GlobalMid_Lock);
76 DeleteMidQEntry(struct mid_q_entry *midEntry)
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 mempool_free(midEntry, cifs_mid_poolp);
90 struct oplock_q_entry *
91 AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon)
93 struct oplock_q_entry *temp;
94 if ((pinode== NULL) || (tcon == NULL)) {
95 cERROR(1, ("Null parms passed to AllocOplockQEntry"));
98 temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep,
103 temp->pinode = pinode;
106 spin_lock(&GlobalMid_Lock);
107 list_add_tail(&temp->qhead, &GlobalOplock_Q);
108 spin_unlock(&GlobalMid_Lock);
114 void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry)
116 spin_lock(&GlobalMid_Lock);
117 /* should we check if list empty first? */
118 list_del(&oplockEntry->qhead);
119 spin_unlock(&GlobalMid_Lock);
120 kmem_cache_free(cifs_oplock_cachep, oplockEntry);
124 smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer,
125 unsigned int smb_buf_length, struct sockaddr *sin)
129 struct msghdr smb_msg;
131 unsigned len = smb_buf_length + 4;
134 return -ENOTSOCK; /* BB eventually add reconnect code here */
135 iov.iov_base = smb_buffer;
138 smb_msg.msg_name = sin;
139 smb_msg.msg_namelen = sizeof (struct sockaddr);
140 smb_msg.msg_control = NULL;
141 smb_msg.msg_controllen = 0;
142 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
144 /* smb header is converted in header_assemble. bcc and rest of SMB word
145 area, and byte area if necessary, is converted to littleendian in
146 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
147 Flags2 is converted in SendReceive */
149 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
150 cFYI(1, ("Sending smb of length %d", smb_buf_length));
151 dump_smb(smb_buffer, len);
154 rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len);
155 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
157 /* smaller timeout here than send2 since smaller size */
158 /* Although it may not be required, this also is smaller
162 ("sends on sock %p stuck for 15 seconds",
178 cERROR(1,("Error %d sending data on socket to server", rc));
186 #ifdef CONFIG_CIFS_EXPERIMENTAL
188 smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
189 struct sockaddr *sin)
193 struct msghdr smb_msg;
194 struct smb_hdr *smb_buffer = iov[0].iov_base;
195 unsigned int len = iov[0].iov_len;
196 unsigned int total_len;
200 return -ENOTSOCK; /* BB eventually add reconnect code here */
202 smb_msg.msg_name = sin;
203 smb_msg.msg_namelen = sizeof (struct sockaddr);
204 smb_msg.msg_control = NULL;
205 smb_msg.msg_controllen = 0;
206 smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/
208 /* smb header is converted in header_assemble. bcc and rest of SMB word
209 area, and byte area if necessary, is converted to littleendian in
210 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
211 Flags2 is converted in SendReceive */
215 for (i = 0; i < n_vec; i++)
216 total_len += iov[i].iov_len;
218 smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length);
219 cFYI(1, ("Sending smb: total_len %d", total_len));
220 dump_smb(smb_buffer, len);
223 rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec],
224 n_vec - first_vec, total_len);
225 if ((rc == -ENOSPC) || (rc == -EAGAIN)) {
229 ("sends on sock %p stuck for 20 seconds",
240 if (rc >= total_len) {
241 WARN_ON(rc > total_len);
245 /* should never happen, letting socket clear before
246 retrying is our only obvious option here */
247 cERROR(1,("tcp sent no data");
252 for (i = first_vec; i < n_vec; i++) {
253 if (iov[i].iov_len) {
254 if (rc > iov[i].iov_len) {
255 rc -= iov[i].iov_len;
258 iov[i].iov_base += rc;
259 iov[i].iov_len -= rc;
268 cERROR(1,("Error %d sending data on socket to server", rc));
276 SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
277 struct kvec *iov, int n_vec, int *pbytes_returned,
281 unsigned int receive_len;
282 unsigned long timeout;
283 struct mid_q_entry *midQ;
284 struct smb_hdr *in_buf = iov[0].iov_base;
287 cERROR(1,("Null smb session"));
290 if(ses->server == NULL) {
291 cERROR(1,("Null tcp session"));
295 if(ses->server->tcpStatus == CifsExiting)
298 /* Ensure that we do not send more than 50 overlapping requests
299 to the same server. We may make this configurable later or
302 /* oplock breaks must not be held up */
303 atomic_inc(&ses->server->inFlight);
305 spin_lock(&GlobalMid_Lock);
307 if(atomic_read(&ses->server->inFlight) >=
309 spin_unlock(&GlobalMid_Lock);
310 wait_event(ses->server->request_q,
311 atomic_read(&ses->server->inFlight)
313 spin_lock(&GlobalMid_Lock);
315 if(ses->server->tcpStatus == CifsExiting) {
316 spin_unlock(&GlobalMid_Lock);
320 /* can not count locking commands against total since
321 they are allowed to block on server */
324 /* update # of requests on the wire to server */
325 atomic_inc(&ses->server->inFlight);
327 spin_unlock(&GlobalMid_Lock);
332 /* make sure that we sign in the same order that we send on this socket
333 and avoid races inside tcp sendmsg code that could cause corruption
336 down(&ses->server->tcpSem);
338 if (ses->server->tcpStatus == CifsExiting) {
341 } else if (ses->server->tcpStatus == CifsNeedReconnect) {
342 cFYI(1,("tcp session dead - return to caller to retry"));
345 } else if (ses->status != CifsGood) {
346 /* check if SMB session is bad because we are setting it up */
347 if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
348 (in_buf->Command != SMB_COM_NEGOTIATE)) {
351 } /* else ok - we are setting up session */
353 midQ = AllocMidQEntry(in_buf, ses);
355 up(&ses->server->tcpSem);
356 /* If not lock req, update # of requests on wire to server */
358 atomic_dec(&ses->server->inFlight);
359 wake_up(&ses->server->request_q);
364 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
365 up(&ses->server->tcpSem);
367 ("Illegal length, greater than maximum frame, %d ",
368 in_buf->smb_buf_length));
369 DeleteMidQEntry(midQ);
370 /* If not lock req, update # of requests on wire to server */
372 atomic_dec(&ses->server->inFlight);
373 wake_up(&ses->server->request_q);
379 /* rc = cifs_sign_smb2(in_buf, data, ses->server, &midQ->sequence_number); */
381 midQ->midState = MID_REQUEST_SUBMITTED;
382 rc = smb_send2(ses->server->ssocket, iov, n_vec,
383 (struct sockaddr *) &(ses->server->addr.sockAddr));
385 DeleteMidQEntry(midQ);
386 up(&ses->server->tcpSem);
387 /* If not lock req, update # of requests on wire to server */
389 atomic_dec(&ses->server->inFlight);
390 wake_up(&ses->server->request_q);
394 up(&ses->server->tcpSem);
396 goto cifs_no_response_exit2;
397 else if (long_op == 2) /* writes past end of file can take loong time */
399 else if (long_op == 1)
400 timeout = 45 * HZ; /* should be greater than
401 servers oplock break timeout (about 43 seconds) */
402 else if (long_op > 2) {
403 timeout = MAX_SCHEDULE_TIMEOUT;
406 /* wait for 15 seconds or until woken up due to response arriving or
407 due to last connection to this server being unmounted */
408 if (signal_pending(current)) {
409 /* if signal pending do not hold up user for full smb timeout
410 but we still give response a change to complete */
414 /* No user interrupts in wait - wreaks havoc with performance */
415 if(timeout != MAX_SCHEDULE_TIMEOUT) {
417 wait_event(ses->server->response_q,
418 (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
419 time_after(jiffies, timeout) ||
420 ((ses->server->tcpStatus != CifsGood) &&
421 (ses->server->tcpStatus != CifsNew)));
423 wait_event(ses->server->response_q,
424 (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
425 ((ses->server->tcpStatus != CifsGood) &&
426 (ses->server->tcpStatus != CifsNew)));
429 spin_lock(&GlobalMid_Lock);
430 if (midQ->resp_buf) {
431 spin_unlock(&GlobalMid_Lock);
432 receive_len = midQ->resp_buf->smb_buf_length;
434 cERROR(1,("No response buffer"));
435 if(midQ->midState == MID_REQUEST_SUBMITTED) {
436 if(ses->server->tcpStatus == CifsExiting)
439 ses->server->tcpStatus = CifsNeedReconnect;
440 midQ->midState = MID_RETRY_NEEDED;
444 if (rc != -EHOSTDOWN) {
445 if(midQ->midState == MID_RETRY_NEEDED) {
447 cFYI(1,("marking request for retry"));
452 spin_unlock(&GlobalMid_Lock);
453 DeleteMidQEntry(midQ);
454 /* If not lock req, update # of requests on wire to server */
456 atomic_dec(&ses->server->inFlight);
457 wake_up(&ses->server->request_q);
462 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
463 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
466 } else { /* rcvd frame is ok */
468 if (midQ->resp_buf &&
469 (midQ->midState == MID_RESPONSE_RECEIVED)) {
470 in_buf->smb_buf_length = receive_len;
471 /* BB verify that length would not overrun small buf */
472 memcpy((char *)in_buf + 4,
473 (char *)midQ->resp_buf + 4,
476 dump_smb(in_buf, 80);
477 /* convert the length into a more usable form */
478 if((receive_len > 24) &&
479 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
480 SECMODE_SIGN_ENABLED))) {
481 rc = cifs_verify_signature(in_buf,
482 ses->server->mac_signing_key,
483 midQ->sequence_number+1);
485 cERROR(1,("Unexpected SMB signature"));
486 /* BB FIXME add code to kill session */
490 *pbytes_returned = in_buf->smb_buf_length;
492 /* BB special case reconnect tid and uid here? */
493 rc = map_smb_to_linux_error(in_buf);
495 /* convert ByteCount if necessary */
497 sizeof (struct smb_hdr) -
498 4 /* do not count RFC1001 header */ +
499 (2 * in_buf->WordCount) + 2 /* bcc */ )
500 BCC(in_buf) = le16_to_cpu(BCC(in_buf));
503 cFYI(1,("Bad MID state?"));
506 cifs_no_response_exit2:
507 DeleteMidQEntry(midQ);
510 atomic_dec(&ses->server->inFlight);
511 wake_up(&ses->server->request_q);
517 up(&ses->server->tcpSem);
518 /* If not lock req, update # of requests on wire to server */
520 atomic_dec(&ses->server->inFlight);
521 wake_up(&ses->server->request_q);
526 #endif /* CIFS_EXPERIMENTAL */
529 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
530 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
531 int *pbytes_returned, const int long_op)
534 unsigned int receive_len;
535 unsigned long timeout;
536 struct mid_q_entry *midQ;
539 cERROR(1,("Null smb session"));
542 if(ses->server == NULL) {
543 cERROR(1,("Null tcp session"));
547 if(ses->server->tcpStatus == CifsExiting)
550 /* Ensure that we do not send more than 50 overlapping requests
551 to the same server. We may make this configurable later or
554 /* oplock breaks must not be held up */
555 atomic_inc(&ses->server->inFlight);
557 spin_lock(&GlobalMid_Lock);
559 if(atomic_read(&ses->server->inFlight) >=
561 spin_unlock(&GlobalMid_Lock);
562 wait_event(ses->server->request_q,
563 atomic_read(&ses->server->inFlight)
565 spin_lock(&GlobalMid_Lock);
567 if(ses->server->tcpStatus == CifsExiting) {
568 spin_unlock(&GlobalMid_Lock);
572 /* can not count locking commands against total since
573 they are allowed to block on server */
576 /* update # of requests on the wire to server */
577 atomic_inc(&ses->server->inFlight);
579 spin_unlock(&GlobalMid_Lock);
584 /* make sure that we sign in the same order that we send on this socket
585 and avoid races inside tcp sendmsg code that could cause corruption
588 down(&ses->server->tcpSem);
590 if (ses->server->tcpStatus == CifsExiting) {
593 } else if (ses->server->tcpStatus == CifsNeedReconnect) {
594 cFYI(1,("tcp session dead - return to caller to retry"));
597 } else if (ses->status != CifsGood) {
598 /* check if SMB session is bad because we are setting it up */
599 if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
600 (in_buf->Command != SMB_COM_NEGOTIATE)) {
603 } /* else ok - we are setting up session */
605 midQ = AllocMidQEntry(in_buf, ses);
607 up(&ses->server->tcpSem);
608 /* If not lock req, update # of requests on wire to server */
610 atomic_dec(&ses->server->inFlight);
611 wake_up(&ses->server->request_q);
616 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
617 up(&ses->server->tcpSem);
619 ("Illegal length, greater than maximum frame, %d ",
620 in_buf->smb_buf_length));
621 DeleteMidQEntry(midQ);
622 /* If not lock req, update # of requests on wire to server */
624 atomic_dec(&ses->server->inFlight);
625 wake_up(&ses->server->request_q);
630 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
632 midQ->midState = MID_REQUEST_SUBMITTED;
633 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
634 (struct sockaddr *) &(ses->server->addr.sockAddr));
636 DeleteMidQEntry(midQ);
637 up(&ses->server->tcpSem);
638 /* If not lock req, update # of requests on wire to server */
640 atomic_dec(&ses->server->inFlight);
641 wake_up(&ses->server->request_q);
645 up(&ses->server->tcpSem);
647 goto cifs_no_response_exit;
648 else if (long_op == 2) /* writes past end of file can take loong time */
650 else if (long_op == 1)
651 timeout = 45 * HZ; /* should be greater than
652 servers oplock break timeout (about 43 seconds) */
653 else if (long_op > 2) {
654 timeout = MAX_SCHEDULE_TIMEOUT;
657 /* wait for 15 seconds or until woken up due to response arriving or
658 due to last connection to this server being unmounted */
659 if (signal_pending(current)) {
660 /* if signal pending do not hold up user for full smb timeout
661 but we still give response a change to complete */
665 /* No user interrupts in wait - wreaks havoc with performance */
666 if(timeout != MAX_SCHEDULE_TIMEOUT) {
668 wait_event(ses->server->response_q,
669 (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
670 time_after(jiffies, timeout) ||
671 ((ses->server->tcpStatus != CifsGood) &&
672 (ses->server->tcpStatus != CifsNew)));
674 wait_event(ses->server->response_q,
675 (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
676 ((ses->server->tcpStatus != CifsGood) &&
677 (ses->server->tcpStatus != CifsNew)));
680 spin_lock(&GlobalMid_Lock);
681 if (midQ->resp_buf) {
682 spin_unlock(&GlobalMid_Lock);
683 receive_len = midQ->resp_buf->smb_buf_length;
685 cERROR(1,("No response buffer"));
686 if(midQ->midState == MID_REQUEST_SUBMITTED) {
687 if(ses->server->tcpStatus == CifsExiting)
690 ses->server->tcpStatus = CifsNeedReconnect;
691 midQ->midState = MID_RETRY_NEEDED;
695 if (rc != -EHOSTDOWN) {
696 if(midQ->midState == MID_RETRY_NEEDED) {
698 cFYI(1,("marking request for retry"));
703 spin_unlock(&GlobalMid_Lock);
704 DeleteMidQEntry(midQ);
705 /* If not lock req, update # of requests on wire to server */
707 atomic_dec(&ses->server->inFlight);
708 wake_up(&ses->server->request_q);
713 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
714 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
717 } else { /* rcvd frame is ok */
719 if (midQ->resp_buf && out_buf
720 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
721 out_buf->smb_buf_length = receive_len;
722 memcpy((char *)out_buf + 4,
723 (char *)midQ->resp_buf + 4,
726 dump_smb(out_buf, 92);
727 /* convert the length into a more usable form */
728 if((receive_len > 24) &&
729 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
730 SECMODE_SIGN_ENABLED))) {
731 rc = cifs_verify_signature(out_buf,
732 ses->server->mac_signing_key,
733 midQ->sequence_number+1);
735 cERROR(1,("Unexpected SMB signature"));
736 /* BB FIXME add code to kill session */
740 *pbytes_returned = out_buf->smb_buf_length;
742 /* BB special case reconnect tid and uid here? */
743 rc = map_smb_to_linux_error(out_buf);
745 /* convert ByteCount if necessary */
747 sizeof (struct smb_hdr) -
748 4 /* do not count RFC1001 header */ +
749 (2 * out_buf->WordCount) + 2 /* bcc */ )
750 BCC(out_buf) = le16_to_cpu(BCC(out_buf));
753 cERROR(1,("Bad MID state? "));
756 cifs_no_response_exit:
757 DeleteMidQEntry(midQ);
760 atomic_dec(&ses->server->inFlight);
761 wake_up(&ses->server->request_q);
767 up(&ses->server->tcpSem);
768 /* If not lock req, update # of requests on wire to server */
770 atomic_dec(&ses->server->inFlight);
771 wake_up(&ses->server->request_q);