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 SendReceive2(const unsigned int xid
, struct cifsSesInfo
*ses
,
469 struct kvec
*iov
, int n_vec
, int *pRespBufType
/* ret */,
474 unsigned int receive_len
;
475 struct mid_q_entry
*midQ
;
476 struct smb_hdr
*in_buf
= iov
[0].iov_base
;
478 long_op
= flags
& CIFS_TIMEOUT_MASK
;
480 *pRespBufType
= CIFS_NO_BUFFER
; /* no response buf yet */
482 if ((ses
== NULL
) || (ses
->server
== NULL
)) {
483 cifs_small_buf_release(in_buf
);
484 cERROR(1, "Null session");
488 if (ses
->server
->tcpStatus
== CifsExiting
) {
489 cifs_small_buf_release(in_buf
);
493 /* Ensure that we do not send more than 50 overlapping requests
494 to the same server. We may make this configurable later or
497 rc
= wait_for_free_request(ses
->server
, long_op
);
499 cifs_small_buf_release(in_buf
);
503 /* make sure that we sign in the same order that we send on this socket
504 and avoid races inside tcp sendmsg code that could cause corruption
507 mutex_lock(&ses
->server
->srv_mutex
);
509 rc
= allocate_mid(ses
, in_buf
, &midQ
);
511 mutex_unlock(&ses
->server
->srv_mutex
);
512 cifs_small_buf_release(in_buf
);
513 /* Update # of requests on wire to server */
514 atomic_dec(&ses
->server
->inFlight
);
515 wake_up(&ses
->server
->request_q
);
518 rc
= cifs_sign_smb2(iov
, n_vec
, ses
->server
, &midQ
->sequence_number
);
520 mutex_unlock(&ses
->server
->srv_mutex
);
521 cifs_small_buf_release(in_buf
);
525 midQ
->midState
= MID_REQUEST_SUBMITTED
;
526 #ifdef CONFIG_CIFS_STATS2
527 atomic_inc(&ses
->server
->inSend
);
529 rc
= smb_sendv(ses
->server
, iov
, n_vec
);
530 #ifdef CONFIG_CIFS_STATS2
531 atomic_dec(&ses
->server
->inSend
);
532 midQ
->when_sent
= jiffies
;
535 mutex_unlock(&ses
->server
->srv_mutex
);
536 cifs_small_buf_release(in_buf
);
541 if (long_op
== CIFS_ASYNC_OP
)
544 rc
= wait_for_response(ses
->server
, midQ
);
548 rc
= sync_mid_result(midQ
, ses
->server
);
550 atomic_dec(&ses
->server
->inFlight
);
551 wake_up(&ses
->server
->request_q
);
555 receive_len
= midQ
->resp_buf
->smb_buf_length
;
557 if (receive_len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
) {
558 cERROR(1, "Frame too large received. Length: %d Xid: %d",
564 /* rcvd frame is ok */
566 if (midQ
->resp_buf
&&
567 (midQ
->midState
== MID_RESPONSE_RECEIVED
)) {
569 iov
[0].iov_base
= (char *)midQ
->resp_buf
;
571 *pRespBufType
= CIFS_LARGE_BUFFER
;
573 *pRespBufType
= CIFS_SMALL_BUFFER
;
574 iov
[0].iov_len
= receive_len
+ 4;
576 dump_smb(midQ
->resp_buf
, 80);
577 /* convert the length into a more usable form */
578 if ((receive_len
> 24) &&
579 (ses
->server
->secMode
& (SECMODE_SIGN_REQUIRED
|
580 SECMODE_SIGN_ENABLED
))) {
581 rc
= cifs_verify_signature(midQ
->resp_buf
,
583 midQ
->sequence_number
+1);
585 cERROR(1, "Unexpected SMB signature");
586 /* BB FIXME add code to kill session */
590 /* BB special case reconnect tid and uid here? */
591 rc
= map_smb_to_linux_error(midQ
->resp_buf
,
592 flags
& CIFS_LOG_ERROR
);
594 /* convert ByteCount if necessary */
595 if (receive_len
>= sizeof(struct smb_hdr
) - 4
596 /* do not count RFC1001 header */ +
597 (2 * midQ
->resp_buf
->WordCount
) + 2 /* bcc */ )
598 BCC(midQ
->resp_buf
) =
599 le16_to_cpu(BCC_LE(midQ
->resp_buf
));
600 if ((flags
& CIFS_NO_RESP
) == 0)
601 midQ
->resp_buf
= NULL
; /* mark it so buf will
606 cFYI(1, "Bad MID state?");
611 atomic_dec(&ses
->server
->inFlight
);
612 wake_up(&ses
->server
->request_q
);
618 SendReceive(const unsigned int xid
, struct cifsSesInfo
*ses
,
619 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
620 int *pbytes_returned
, const int long_op
)
623 unsigned int receive_len
;
624 struct mid_q_entry
*midQ
;
627 cERROR(1, "Null smb session");
630 if (ses
->server
== NULL
) {
631 cERROR(1, "Null tcp session");
635 if (ses
->server
->tcpStatus
== CifsExiting
)
638 /* Ensure that we do not send more than 50 overlapping requests
639 to the same server. We may make this configurable later or
642 if (in_buf
->smb_buf_length
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
643 cERROR(1, "Illegal length, greater than maximum frame, %d",
644 in_buf
->smb_buf_length
);
648 rc
= wait_for_free_request(ses
->server
, long_op
);
652 /* make sure that we sign in the same order that we send on this socket
653 and avoid races inside tcp sendmsg code that could cause corruption
656 mutex_lock(&ses
->server
->srv_mutex
);
658 rc
= allocate_mid(ses
, in_buf
, &midQ
);
660 mutex_unlock(&ses
->server
->srv_mutex
);
661 /* Update # of requests on wire to server */
662 atomic_dec(&ses
->server
->inFlight
);
663 wake_up(&ses
->server
->request_q
);
667 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
669 mutex_unlock(&ses
->server
->srv_mutex
);
673 midQ
->midState
= MID_REQUEST_SUBMITTED
;
674 #ifdef CONFIG_CIFS_STATS2
675 atomic_inc(&ses
->server
->inSend
);
677 rc
= smb_send(ses
->server
, in_buf
, in_buf
->smb_buf_length
);
678 #ifdef CONFIG_CIFS_STATS2
679 atomic_dec(&ses
->server
->inSend
);
680 midQ
->when_sent
= jiffies
;
682 mutex_unlock(&ses
->server
->srv_mutex
);
687 if (long_op
== CIFS_ASYNC_OP
)
690 rc
= wait_for_response(ses
->server
, midQ
);
694 rc
= sync_mid_result(midQ
, ses
->server
);
696 atomic_dec(&ses
->server
->inFlight
);
697 wake_up(&ses
->server
->request_q
);
701 receive_len
= midQ
->resp_buf
->smb_buf_length
;
703 if (receive_len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
) {
704 cERROR(1, "Frame too large received. Length: %d Xid: %d",
710 /* rcvd frame is ok */
712 if (midQ
->resp_buf
&& out_buf
713 && (midQ
->midState
== MID_RESPONSE_RECEIVED
)) {
714 out_buf
->smb_buf_length
= receive_len
;
715 memcpy((char *)out_buf
+ 4,
716 (char *)midQ
->resp_buf
+ 4,
719 dump_smb(out_buf
, 92);
720 /* convert the length into a more usable form */
721 if ((receive_len
> 24) &&
722 (ses
->server
->secMode
& (SECMODE_SIGN_REQUIRED
|
723 SECMODE_SIGN_ENABLED
))) {
724 rc
= cifs_verify_signature(out_buf
,
726 midQ
->sequence_number
+1);
728 cERROR(1, "Unexpected SMB signature");
729 /* BB FIXME add code to kill session */
733 *pbytes_returned
= out_buf
->smb_buf_length
;
735 /* BB special case reconnect tid and uid here? */
736 rc
= map_smb_to_linux_error(out_buf
, 0 /* no log */ );
738 /* convert ByteCount if necessary */
739 if (receive_len
>= sizeof(struct smb_hdr
) - 4
740 /* do not count RFC1001 header */ +
741 (2 * out_buf
->WordCount
) + 2 /* bcc */ )
742 BCC(out_buf
) = le16_to_cpu(BCC_LE(out_buf
));
745 cERROR(1, "Bad MID state?");
750 atomic_dec(&ses
->server
->inFlight
);
751 wake_up(&ses
->server
->request_q
);
756 /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */
759 send_nt_cancel(struct cifsTconInfo
*tcon
, struct smb_hdr
*in_buf
,
760 struct mid_q_entry
*midQ
)
763 struct cifsSesInfo
*ses
= tcon
->ses
;
764 __u16 mid
= in_buf
->Mid
;
766 header_assemble(in_buf
, SMB_COM_NT_CANCEL
, tcon
, 0);
768 mutex_lock(&ses
->server
->srv_mutex
);
769 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
771 mutex_unlock(&ses
->server
->srv_mutex
);
774 rc
= smb_send(ses
->server
, in_buf
, in_buf
->smb_buf_length
);
775 mutex_unlock(&ses
->server
->srv_mutex
);
779 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
780 blocking lock to return. */
783 send_lock_cancel(const unsigned int xid
, struct cifsTconInfo
*tcon
,
784 struct smb_hdr
*in_buf
,
785 struct smb_hdr
*out_buf
)
788 struct cifsSesInfo
*ses
= tcon
->ses
;
789 LOCK_REQ
*pSMB
= (LOCK_REQ
*)in_buf
;
791 /* We just modify the current in_buf to change
792 the type of lock from LOCKING_ANDX_SHARED_LOCK
793 or LOCKING_ANDX_EXCLUSIVE_LOCK to
794 LOCKING_ANDX_CANCEL_LOCK. */
796 pSMB
->LockType
= LOCKING_ANDX_CANCEL_LOCK
|LOCKING_ANDX_LARGE_FILES
;
798 pSMB
->hdr
.Mid
= GetNextMid(ses
->server
);
800 return SendReceive(xid
, ses
, in_buf
, out_buf
,
801 &bytes_returned
, CIFS_STD_OP
);
805 SendReceiveBlockingLock(const unsigned int xid
, struct cifsTconInfo
*tcon
,
806 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
807 int *pbytes_returned
)
811 unsigned int receive_len
;
812 struct mid_q_entry
*midQ
;
813 struct cifsSesInfo
*ses
;
815 if (tcon
== NULL
|| tcon
->ses
== NULL
) {
816 cERROR(1, "Null smb session");
821 if (ses
->server
== NULL
) {
822 cERROR(1, "Null tcp session");
826 if (ses
->server
->tcpStatus
== CifsExiting
)
829 /* Ensure that we do not send more than 50 overlapping requests
830 to the same server. We may make this configurable later or
833 if (in_buf
->smb_buf_length
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
834 cERROR(1, "Illegal length, greater than maximum frame, %d",
835 in_buf
->smb_buf_length
);
839 rc
= wait_for_free_request(ses
->server
, CIFS_BLOCKING_OP
);
843 /* make sure that we sign in the same order that we send on this socket
844 and avoid races inside tcp sendmsg code that could cause corruption
847 mutex_lock(&ses
->server
->srv_mutex
);
849 rc
= allocate_mid(ses
, in_buf
, &midQ
);
851 mutex_unlock(&ses
->server
->srv_mutex
);
855 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
858 mutex_unlock(&ses
->server
->srv_mutex
);
862 midQ
->midState
= MID_REQUEST_SUBMITTED
;
863 #ifdef CONFIG_CIFS_STATS2
864 atomic_inc(&ses
->server
->inSend
);
866 rc
= smb_send(ses
->server
, in_buf
, in_buf
->smb_buf_length
);
867 #ifdef CONFIG_CIFS_STATS2
868 atomic_dec(&ses
->server
->inSend
);
869 midQ
->when_sent
= jiffies
;
871 mutex_unlock(&ses
->server
->srv_mutex
);
878 /* Wait for a reply - allow signals to interrupt. */
879 rc
= wait_event_interruptible(ses
->server
->response_q
,
880 (!(midQ
->midState
== MID_REQUEST_SUBMITTED
)) ||
881 ((ses
->server
->tcpStatus
!= CifsGood
) &&
882 (ses
->server
->tcpStatus
!= CifsNew
)));
884 /* Were we interrupted by a signal ? */
885 if ((rc
== -ERESTARTSYS
) &&
886 (midQ
->midState
== MID_REQUEST_SUBMITTED
) &&
887 ((ses
->server
->tcpStatus
== CifsGood
) ||
888 (ses
->server
->tcpStatus
== CifsNew
))) {
890 if (in_buf
->Command
== SMB_COM_TRANSACTION2
) {
891 /* POSIX lock. We send a NT_CANCEL SMB to cause the
892 blocking lock to return. */
894 rc
= send_nt_cancel(tcon
, in_buf
, midQ
);
900 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
901 to cause the blocking lock to return. */
903 rc
= send_lock_cancel(xid
, tcon
, in_buf
, out_buf
);
905 /* If we get -ENOLCK back the lock may have
906 already been removed. Don't exit in this case. */
907 if (rc
&& rc
!= -ENOLCK
) {
913 if (wait_for_response(ses
->server
, midQ
) == 0) {
914 /* We got the response - restart system call. */
919 rc
= sync_mid_result(midQ
, ses
->server
);
923 receive_len
= midQ
->resp_buf
->smb_buf_length
;
924 if (receive_len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
) {
925 cERROR(1, "Frame too large received. Length: %d Xid: %d",
931 /* rcvd frame is ok */
933 if ((out_buf
== NULL
) || (midQ
->midState
!= MID_RESPONSE_RECEIVED
)) {
935 cERROR(1, "Bad MID state?");
939 out_buf
->smb_buf_length
= receive_len
;
940 memcpy((char *)out_buf
+ 4,
941 (char *)midQ
->resp_buf
+ 4,
944 dump_smb(out_buf
, 92);
945 /* convert the length into a more usable form */
946 if ((receive_len
> 24) &&
947 (ses
->server
->secMode
& (SECMODE_SIGN_REQUIRED
|
948 SECMODE_SIGN_ENABLED
))) {
949 rc
= cifs_verify_signature(out_buf
,
951 midQ
->sequence_number
+1);
953 cERROR(1, "Unexpected SMB signature");
954 /* BB FIXME add code to kill session */
958 *pbytes_returned
= out_buf
->smb_buf_length
;
960 /* BB special case reconnect tid and uid here? */
961 rc
= map_smb_to_linux_error(out_buf
, 0 /* no log */ );
963 /* convert ByteCount if necessary */
964 if (receive_len
>= sizeof(struct smb_hdr
) - 4
965 /* do not count RFC1001 header */ +
966 (2 * out_buf
->WordCount
) + 2 /* bcc */ )
967 BCC(out_buf
) = le16_to_cpu(BCC_LE(out_buf
));
971 if (rstart
&& rc
== -EACCES
)