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 to cmd %d mid %d",
435 midQ->command, midQ->mid));
436 if(midQ->midState == MID_REQUEST_SUBMITTED) {
437 if(ses->server->tcpStatus == CifsExiting)
440 ses->server->tcpStatus = CifsNeedReconnect;
441 midQ->midState = MID_RETRY_NEEDED;
445 if (rc != -EHOSTDOWN) {
446 if(midQ->midState == MID_RETRY_NEEDED) {
448 cFYI(1,("marking request for retry"));
453 spin_unlock(&GlobalMid_Lock);
454 DeleteMidQEntry(midQ);
455 /* If not lock req, update # of requests on wire to server */
457 atomic_dec(&ses->server->inFlight);
458 wake_up(&ses->server->request_q);
463 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
464 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
467 } else { /* rcvd frame is ok */
469 if (midQ->resp_buf &&
470 (midQ->midState == MID_RESPONSE_RECEIVED)) {
471 in_buf->smb_buf_length = receive_len;
472 /* BB verify that length would not overrun small buf */
473 memcpy((char *)in_buf + 4,
474 (char *)midQ->resp_buf + 4,
477 dump_smb(in_buf, 80);
478 /* convert the length into a more usable form */
479 if((receive_len > 24) &&
480 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
481 SECMODE_SIGN_ENABLED))) {
482 rc = cifs_verify_signature(in_buf,
483 ses->server->mac_signing_key,
484 midQ->sequence_number+1);
486 cERROR(1,("Unexpected SMB signature"));
487 /* BB FIXME add code to kill session */
491 *pbytes_returned = in_buf->smb_buf_length;
493 /* BB special case reconnect tid and uid here? */
494 rc = map_smb_to_linux_error(in_buf);
496 /* convert ByteCount if necessary */
498 sizeof (struct smb_hdr) -
499 4 /* do not count RFC1001 header */ +
500 (2 * in_buf->WordCount) + 2 /* bcc */ )
501 BCC(in_buf) = le16_to_cpu(BCC(in_buf));
504 cFYI(1,("Bad MID state?"));
507 cifs_no_response_exit2:
508 DeleteMidQEntry(midQ);
511 atomic_dec(&ses->server->inFlight);
512 wake_up(&ses->server->request_q);
518 up(&ses->server->tcpSem);
519 /* If not lock req, update # of requests on wire to server */
521 atomic_dec(&ses->server->inFlight);
522 wake_up(&ses->server->request_q);
527 #endif /* CIFS_EXPERIMENTAL */
530 SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
531 struct smb_hdr *in_buf, struct smb_hdr *out_buf,
532 int *pbytes_returned, const int long_op)
535 unsigned int receive_len;
536 unsigned long timeout;
537 struct mid_q_entry *midQ;
540 cERROR(1,("Null smb session"));
543 if(ses->server == NULL) {
544 cERROR(1,("Null tcp session"));
548 if(ses->server->tcpStatus == CifsExiting)
551 /* Ensure that we do not send more than 50 overlapping requests
552 to the same server. We may make this configurable later or
555 /* oplock breaks must not be held up */
556 atomic_inc(&ses->server->inFlight);
558 spin_lock(&GlobalMid_Lock);
560 if(atomic_read(&ses->server->inFlight) >=
562 spin_unlock(&GlobalMid_Lock);
563 wait_event(ses->server->request_q,
564 atomic_read(&ses->server->inFlight)
566 spin_lock(&GlobalMid_Lock);
568 if(ses->server->tcpStatus == CifsExiting) {
569 spin_unlock(&GlobalMid_Lock);
573 /* can not count locking commands against total since
574 they are allowed to block on server */
577 /* update # of requests on the wire to server */
578 atomic_inc(&ses->server->inFlight);
580 spin_unlock(&GlobalMid_Lock);
585 /* make sure that we sign in the same order that we send on this socket
586 and avoid races inside tcp sendmsg code that could cause corruption
589 down(&ses->server->tcpSem);
591 if (ses->server->tcpStatus == CifsExiting) {
594 } else if (ses->server->tcpStatus == CifsNeedReconnect) {
595 cFYI(1,("tcp session dead - return to caller to retry"));
598 } else if (ses->status != CifsGood) {
599 /* check if SMB session is bad because we are setting it up */
600 if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) &&
601 (in_buf->Command != SMB_COM_NEGOTIATE)) {
604 } /* else ok - we are setting up session */
606 midQ = AllocMidQEntry(in_buf, ses);
608 up(&ses->server->tcpSem);
609 /* If not lock req, update # of requests on wire to server */
611 atomic_dec(&ses->server->inFlight);
612 wake_up(&ses->server->request_q);
617 if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
618 up(&ses->server->tcpSem);
620 ("Illegal length, greater than maximum frame, %d ",
621 in_buf->smb_buf_length));
622 DeleteMidQEntry(midQ);
623 /* If not lock req, update # of requests on wire to server */
625 atomic_dec(&ses->server->inFlight);
626 wake_up(&ses->server->request_q);
631 rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
633 midQ->midState = MID_REQUEST_SUBMITTED;
634 rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length,
635 (struct sockaddr *) &(ses->server->addr.sockAddr));
637 DeleteMidQEntry(midQ);
638 up(&ses->server->tcpSem);
639 /* If not lock req, update # of requests on wire to server */
641 atomic_dec(&ses->server->inFlight);
642 wake_up(&ses->server->request_q);
646 up(&ses->server->tcpSem);
648 goto cifs_no_response_exit;
649 else if (long_op == 2) /* writes past end of file can take loong time */
651 else if (long_op == 1)
652 timeout = 45 * HZ; /* should be greater than
653 servers oplock break timeout (about 43 seconds) */
654 else if (long_op > 2) {
655 timeout = MAX_SCHEDULE_TIMEOUT;
658 /* wait for 15 seconds or until woken up due to response arriving or
659 due to last connection to this server being unmounted */
660 if (signal_pending(current)) {
661 /* if signal pending do not hold up user for full smb timeout
662 but we still give response a change to complete */
666 /* No user interrupts in wait - wreaks havoc with performance */
667 if(timeout != MAX_SCHEDULE_TIMEOUT) {
669 wait_event(ses->server->response_q,
670 (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
671 time_after(jiffies, timeout) ||
672 ((ses->server->tcpStatus != CifsGood) &&
673 (ses->server->tcpStatus != CifsNew)));
675 wait_event(ses->server->response_q,
676 (!(midQ->midState & MID_REQUEST_SUBMITTED)) ||
677 ((ses->server->tcpStatus != CifsGood) &&
678 (ses->server->tcpStatus != CifsNew)));
681 spin_lock(&GlobalMid_Lock);
682 if (midQ->resp_buf) {
683 spin_unlock(&GlobalMid_Lock);
684 receive_len = midQ->resp_buf->smb_buf_length;
686 cERROR(1,("No response for cmd %d mid %d",
687 midQ->command, midQ->mid));
688 if(midQ->midState == MID_REQUEST_SUBMITTED) {
689 if(ses->server->tcpStatus == CifsExiting)
692 ses->server->tcpStatus = CifsNeedReconnect;
693 midQ->midState = MID_RETRY_NEEDED;
697 if (rc != -EHOSTDOWN) {
698 if(midQ->midState == MID_RETRY_NEEDED) {
700 cFYI(1,("marking request for retry"));
705 spin_unlock(&GlobalMid_Lock);
706 DeleteMidQEntry(midQ);
707 /* If not lock req, update # of requests on wire to server */
709 atomic_dec(&ses->server->inFlight);
710 wake_up(&ses->server->request_q);
715 if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
716 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
719 } else { /* rcvd frame is ok */
721 if (midQ->resp_buf && out_buf
722 && (midQ->midState == MID_RESPONSE_RECEIVED)) {
723 out_buf->smb_buf_length = receive_len;
724 memcpy((char *)out_buf + 4,
725 (char *)midQ->resp_buf + 4,
728 dump_smb(out_buf, 92);
729 /* convert the length into a more usable form */
730 if((receive_len > 24) &&
731 (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
732 SECMODE_SIGN_ENABLED))) {
733 rc = cifs_verify_signature(out_buf,
734 ses->server->mac_signing_key,
735 midQ->sequence_number+1);
737 cERROR(1,("Unexpected SMB signature"));
738 /* BB FIXME add code to kill session */
742 *pbytes_returned = out_buf->smb_buf_length;
744 /* BB special case reconnect tid and uid here? */
745 rc = map_smb_to_linux_error(out_buf);
747 /* convert ByteCount if necessary */
749 sizeof (struct smb_hdr) -
750 4 /* do not count RFC1001 header */ +
751 (2 * out_buf->WordCount) + 2 /* bcc */ )
752 BCC(out_buf) = le16_to_cpu(BCC(out_buf));
755 cERROR(1,("Bad MID state? "));
758 cifs_no_response_exit:
759 DeleteMidQEntry(midQ);
762 atomic_dec(&ses->server->inFlight);
763 wake_up(&ses->server->request_q);
769 up(&ses->server->tcpSem);
770 /* If not lock req, update # of requests on wire to server */
772 atomic_dec(&ses->server->inFlight);
773 wake_up(&ses->server->request_q);