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 <linux/freezer.h>
30 #include <linux/tcp.h>
31 #include <linux/bvec.h>
32 #include <linux/highmem.h>
33 #include <linux/uaccess.h>
34 #include <asm/processor.h>
35 #include <linux/mempool.h>
38 #include "cifsproto.h"
39 #include "cifs_debug.h"
42 cifs_wake_up_task(struct mid_q_entry
*mid
)
44 wake_up_process(mid
->callback_data
);
48 AllocMidQEntry(const struct smb_hdr
*smb_buffer
, struct TCP_Server_Info
*server
)
50 struct mid_q_entry
*temp
;
53 cifs_dbg(VFS
, "Null TCP session in AllocMidQEntry\n");
57 temp
= mempool_alloc(cifs_mid_poolp
, GFP_NOFS
);
58 memset(temp
, 0, sizeof(struct mid_q_entry
));
59 temp
->mid
= get_mid(smb_buffer
);
60 temp
->pid
= current
->pid
;
61 temp
->command
= cpu_to_le16(smb_buffer
->Command
);
62 cifs_dbg(FYI
, "For smb_command %d\n", smb_buffer
->Command
);
63 /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
64 /* when mid allocated can be before when sent */
65 temp
->when_alloc
= jiffies
;
66 temp
->server
= server
;
69 * The default is for the mid to be synchronous, so the
70 * default callback just wakes up the current task.
72 temp
->callback
= cifs_wake_up_task
;
73 temp
->callback_data
= current
;
75 atomic_inc(&midCount
);
76 temp
->mid_state
= MID_REQUEST_ALLOCATED
;
81 DeleteMidQEntry(struct mid_q_entry
*midEntry
)
83 #ifdef CONFIG_CIFS_STATS2
84 __le16 command
= midEntry
->server
->vals
->lock_cmd
;
87 midEntry
->mid_state
= MID_FREE
;
88 atomic_dec(&midCount
);
89 if (midEntry
->large_buf
)
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 (time_after(now
, midEntry
->when_alloc
+ HZ
)) {
98 if ((cifsFYI
& CIFS_TIMER
) && (midEntry
->command
!= command
)) {
99 pr_debug(" CIFS slow rsp: cmd %d mid %llu",
100 midEntry
->command
, midEntry
->mid
);
101 pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
102 now
- midEntry
->when_alloc
,
103 now
- midEntry
->when_sent
,
104 now
- midEntry
->when_received
);
108 mempool_free(midEntry
, cifs_mid_poolp
);
112 cifs_delete_mid(struct mid_q_entry
*mid
)
114 spin_lock(&GlobalMid_Lock
);
115 list_del(&mid
->qhead
);
116 spin_unlock(&GlobalMid_Lock
);
118 DeleteMidQEntry(mid
);
122 * smb_send_kvec - send an array of kvecs to the server
123 * @server: Server to send the data to
124 * @smb_msg: Message to send
125 * @sent: amount of data sent on socket is stored here
127 * Our basic "send data to server" function. Should be called with srv_mutex
128 * held. The caller is responsible for handling the results.
131 smb_send_kvec(struct TCP_Server_Info
*server
, struct msghdr
*smb_msg
,
136 struct socket
*ssocket
= server
->ssocket
;
140 smb_msg
->msg_name
= (struct sockaddr
*) &server
->dstaddr
;
141 smb_msg
->msg_namelen
= sizeof(struct sockaddr
);
142 smb_msg
->msg_control
= NULL
;
143 smb_msg
->msg_controllen
= 0;
144 if (server
->noblocksnd
)
145 smb_msg
->msg_flags
= MSG_DONTWAIT
+ MSG_NOSIGNAL
;
147 smb_msg
->msg_flags
= MSG_NOSIGNAL
;
149 while (msg_data_left(smb_msg
)) {
151 * If blocking send, we try 3 times, since each can block
152 * for 5 seconds. For nonblocking we have to try more
153 * but wait increasing amounts of time allowing time for
154 * socket to clear. The overall time we wait in either
155 * case to send on the socket is about 15 seconds.
156 * Similarly we wait for 15 seconds for a response from
157 * the server in SendReceive[2] for the server to send
158 * a response back for most types of requests (except
159 * SMB Write past end of file which can be slow, and
160 * blocking lock operations). NFS waits slightly longer
161 * than CIFS, but this can make it take longer for
162 * nonresponsive servers to be detected and 15 seconds
163 * is more than enough time for modern networks to
164 * send a packet. In most cases if we fail to send
165 * after the retries we will kill the socket and
166 * reconnect which may clear the network problem.
168 rc
= sock_sendmsg(ssocket
, smb_msg
);
172 (!server
->noblocksnd
&& (retries
> 2))) {
173 cifs_dbg(VFS
, "sends on sock %p stuck for 15 seconds\n",
177 msleep(1 << retries
);
185 /* should never happen, letting socket clear before
186 retrying is our only obvious option here */
187 cifs_dbg(VFS
, "tcp sent no data\n");
192 /* send was at least partially successful */
194 retries
= 0; /* in case we get ENOSPC on the next send */
200 rqst_len(struct smb_rqst
*rqst
)
203 struct kvec
*iov
= rqst
->rq_iov
;
204 unsigned long buflen
= 0;
206 /* total up iov array first */
207 for (i
= 0; i
< rqst
->rq_nvec
; i
++)
208 buflen
+= iov
[i
].iov_len
;
210 /* add in the page array if there is one */
211 if (rqst
->rq_npages
) {
212 buflen
+= rqst
->rq_pagesz
* (rqst
->rq_npages
- 1);
213 buflen
+= rqst
->rq_tailsz
;
220 __smb_send_rqst(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
)
223 struct kvec
*iov
= rqst
->rq_iov
;
224 int n_vec
= rqst
->rq_nvec
;
225 unsigned int smb_buf_length
= get_rfc1002_length(iov
[0].iov_base
);
226 unsigned long send_length
;
228 size_t total_len
= 0, sent
, size
;
229 struct socket
*ssocket
= server
->ssocket
;
230 struct msghdr smb_msg
;
236 /* sanity check send length */
237 send_length
= rqst_len(rqst
);
238 if (send_length
!= smb_buf_length
+ 4) {
239 WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n",
240 send_length
, smb_buf_length
);
247 cifs_dbg(FYI
, "Sending smb: smb_len=%u\n", smb_buf_length
);
248 dump_smb(iov
[0].iov_base
, iov
[0].iov_len
);
249 dump_smb(iov
[1].iov_base
, iov
[1].iov_len
);
251 /* cork the socket */
252 kernel_setsockopt(ssocket
, SOL_TCP
, TCP_CORK
,
253 (char *)&val
, sizeof(val
));
256 for (i
= 0; i
< n_vec
; i
++)
257 size
+= iov
[i
].iov_len
;
259 iov_iter_kvec(&smb_msg
.msg_iter
, WRITE
| ITER_KVEC
, iov
, n_vec
, size
);
261 rc
= smb_send_kvec(server
, &smb_msg
, &sent
);
267 /* now walk the page array and send each page in it */
268 for (i
= 0; i
< rqst
->rq_npages
; i
++) {
269 size_t len
= i
== rqst
->rq_npages
- 1
272 struct bio_vec bvec
= {
273 .bv_page
= rqst
->rq_pages
[i
],
276 iov_iter_bvec(&smb_msg
.msg_iter
, WRITE
| ITER_BVEC
,
278 rc
= smb_send_kvec(server
, &smb_msg
, &sent
);
288 kernel_setsockopt(ssocket
, SOL_TCP
, TCP_CORK
,
289 (char *)&val
, sizeof(val
));
291 if ((total_len
> 0) && (total_len
!= smb_buf_length
+ 4)) {
292 cifs_dbg(FYI
, "partial send (wanted=%u sent=%zu): terminating session\n",
293 smb_buf_length
+ 4, total_len
);
295 * If we have only sent part of an SMB then the next SMB could
296 * be taken as the remainder of this one. We need to kill the
297 * socket so the server throws away the partial SMB
299 server
->tcpStatus
= CifsNeedReconnect
;
302 if (rc
< 0 && rc
!= -EINTR
)
303 cifs_dbg(VFS
, "Error %d sending data on socket to server\n",
312 smb_send_rqst(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
, int flags
)
314 struct smb_rqst cur_rqst
;
317 if (!(flags
& CIFS_TRANSFORM_REQ
))
318 return __smb_send_rqst(server
, rqst
);
320 if (!server
->ops
->init_transform_rq
||
321 !server
->ops
->free_transform_rq
) {
322 cifs_dbg(VFS
, "Encryption requested but transform callbacks are missed\n");
326 rc
= server
->ops
->init_transform_rq(server
, &cur_rqst
, rqst
);
330 rc
= __smb_send_rqst(server
, &cur_rqst
);
331 server
->ops
->free_transform_rq(&cur_rqst
);
336 smb_send(struct TCP_Server_Info
*server
, struct smb_hdr
*smb_buffer
,
337 unsigned int smb_buf_length
)
340 struct smb_rqst rqst
= { .rq_iov
= iov
,
343 iov
[0].iov_base
= smb_buffer
;
345 iov
[1].iov_base
= (char *)smb_buffer
+ 4;
346 iov
[1].iov_len
= smb_buf_length
;
348 return __smb_send_rqst(server
, &rqst
);
352 wait_for_free_credits(struct TCP_Server_Info
*server
, const int timeout
,
357 spin_lock(&server
->req_lock
);
358 if (timeout
== CIFS_ASYNC_OP
) {
359 /* oplock breaks must not be held up */
362 spin_unlock(&server
->req_lock
);
368 spin_unlock(&server
->req_lock
);
369 cifs_num_waiters_inc(server
);
370 rc
= wait_event_killable(server
->request_q
,
371 has_credits(server
, credits
));
372 cifs_num_waiters_dec(server
);
375 spin_lock(&server
->req_lock
);
377 if (server
->tcpStatus
== CifsExiting
) {
378 spin_unlock(&server
->req_lock
);
383 * Can not count locking commands against total
384 * as they are allowed to block on server.
387 /* update # of requests on the wire to server */
388 if (timeout
!= CIFS_BLOCKING_OP
) {
392 spin_unlock(&server
->req_lock
);
400 wait_for_free_request(struct TCP_Server_Info
*server
, const int timeout
,
405 val
= server
->ops
->get_credits_field(server
, optype
);
406 /* Since an echo is already inflight, no need to wait to send another */
407 if (*val
<= 0 && optype
== CIFS_ECHO_OP
)
409 return wait_for_free_credits(server
, timeout
, val
);
413 cifs_wait_mtu_credits(struct TCP_Server_Info
*server
, unsigned int size
,
414 unsigned int *num
, unsigned int *credits
)
421 static int allocate_mid(struct cifs_ses
*ses
, struct smb_hdr
*in_buf
,
422 struct mid_q_entry
**ppmidQ
)
424 if (ses
->server
->tcpStatus
== CifsExiting
) {
428 if (ses
->server
->tcpStatus
== CifsNeedReconnect
) {
429 cifs_dbg(FYI
, "tcp session dead - return to caller to retry\n");
433 if (ses
->status
== CifsNew
) {
434 if ((in_buf
->Command
!= SMB_COM_SESSION_SETUP_ANDX
) &&
435 (in_buf
->Command
!= SMB_COM_NEGOTIATE
))
437 /* else ok - we are setting up session */
440 if (ses
->status
== CifsExiting
) {
441 /* check if SMB session is bad because we are setting it up */
442 if (in_buf
->Command
!= SMB_COM_LOGOFF_ANDX
)
444 /* else ok - we are shutting down session */
447 *ppmidQ
= AllocMidQEntry(in_buf
, ses
->server
);
450 spin_lock(&GlobalMid_Lock
);
451 list_add_tail(&(*ppmidQ
)->qhead
, &ses
->server
->pending_mid_q
);
452 spin_unlock(&GlobalMid_Lock
);
457 wait_for_response(struct TCP_Server_Info
*server
, struct mid_q_entry
*midQ
)
461 error
= wait_event_freezekillable_unsafe(server
->response_q
,
462 midQ
->mid_state
!= MID_REQUEST_SUBMITTED
);
470 cifs_setup_async_request(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
)
473 struct smb_hdr
*hdr
= (struct smb_hdr
*)rqst
->rq_iov
[0].iov_base
;
474 struct mid_q_entry
*mid
;
476 if (rqst
->rq_iov
[0].iov_len
!= 4 ||
477 rqst
->rq_iov
[0].iov_base
+ 4 != rqst
->rq_iov
[1].iov_base
)
478 return ERR_PTR(-EIO
);
480 /* enable signing if server requires it */
482 hdr
->Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
484 mid
= AllocMidQEntry(hdr
, server
);
486 return ERR_PTR(-ENOMEM
);
488 rc
= cifs_sign_rqst(rqst
, server
, &mid
->sequence_number
);
490 DeleteMidQEntry(mid
);
498 * Send a SMB request and set the callback function in the mid to handle
499 * the result. Caller is responsible for dealing with timeouts.
502 cifs_call_async(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
,
503 mid_receive_t
*receive
, mid_callback_t
*callback
,
504 mid_handle_t
*handle
, void *cbdata
, const int flags
)
506 int rc
, timeout
, optype
;
507 struct mid_q_entry
*mid
;
508 unsigned int credits
= 0;
510 timeout
= flags
& CIFS_TIMEOUT_MASK
;
511 optype
= flags
& CIFS_OP_MASK
;
513 if ((flags
& CIFS_HAS_CREDITS
) == 0) {
514 rc
= wait_for_free_request(server
, timeout
, optype
);
520 mutex_lock(&server
->srv_mutex
);
521 mid
= server
->ops
->setup_async_request(server
, rqst
);
523 mutex_unlock(&server
->srv_mutex
);
524 add_credits_and_wake_if(server
, credits
, optype
);
528 mid
->receive
= receive
;
529 mid
->callback
= callback
;
530 mid
->callback_data
= cbdata
;
531 mid
->handle
= handle
;
532 mid
->mid_state
= MID_REQUEST_SUBMITTED
;
534 /* put it on the pending_mid_q */
535 spin_lock(&GlobalMid_Lock
);
536 list_add_tail(&mid
->qhead
, &server
->pending_mid_q
);
537 spin_unlock(&GlobalMid_Lock
);
540 cifs_in_send_inc(server
);
541 rc
= smb_send_rqst(server
, rqst
, flags
);
542 cifs_in_send_dec(server
);
543 cifs_save_when_sent(mid
);
546 server
->sequence_number
-= 2;
547 cifs_delete_mid(mid
);
550 mutex_unlock(&server
->srv_mutex
);
555 add_credits_and_wake_if(server
, credits
, optype
);
561 * Send an SMB Request. No response info (other than return code)
562 * needs to be parsed.
564 * flags indicate the type of request buffer and how long to wait
565 * and whether to log NT STATUS code (error) before mapping it to POSIX error
569 SendReceiveNoRsp(const unsigned int xid
, struct cifs_ses
*ses
,
570 char *in_buf
, int flags
)
577 iov
[0].iov_base
= in_buf
;
578 iov
[0].iov_len
= get_rfc1002_length(in_buf
) + 4;
579 flags
|= CIFS_NO_RESP
;
580 rc
= SendReceive2(xid
, ses
, iov
, 1, &resp_buf_type
, flags
, &rsp_iov
);
581 cifs_dbg(NOISY
, "SendRcvNoRsp flags %d rc %d\n", flags
, rc
);
587 cifs_sync_mid_result(struct mid_q_entry
*mid
, struct TCP_Server_Info
*server
)
591 cifs_dbg(FYI
, "%s: cmd=%d mid=%llu state=%d\n",
592 __func__
, le16_to_cpu(mid
->command
), mid
->mid
, mid
->mid_state
);
594 spin_lock(&GlobalMid_Lock
);
595 switch (mid
->mid_state
) {
596 case MID_RESPONSE_RECEIVED
:
597 spin_unlock(&GlobalMid_Lock
);
599 case MID_RETRY_NEEDED
:
602 case MID_RESPONSE_MALFORMED
:
609 list_del_init(&mid
->qhead
);
610 cifs_dbg(VFS
, "%s: invalid mid state mid=%llu state=%d\n",
611 __func__
, mid
->mid
, mid
->mid_state
);
614 spin_unlock(&GlobalMid_Lock
);
616 DeleteMidQEntry(mid
);
621 send_cancel(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
,
622 struct mid_q_entry
*mid
)
624 return server
->ops
->send_cancel
?
625 server
->ops
->send_cancel(server
, rqst
, mid
) : 0;
629 cifs_check_receive(struct mid_q_entry
*mid
, struct TCP_Server_Info
*server
,
632 unsigned int len
= get_rfc1002_length(mid
->resp_buf
) + 4;
634 dump_smb(mid
->resp_buf
, min_t(u32
, 92, len
));
636 /* convert the length into a more usable form */
640 struct smb_rqst rqst
= { .rq_iov
= iov
,
643 iov
[0].iov_base
= mid
->resp_buf
;
645 iov
[1].iov_base
= (char *)mid
->resp_buf
+ 4;
646 iov
[1].iov_len
= len
- 4;
647 /* FIXME: add code to kill session */
648 rc
= cifs_verify_signature(&rqst
, server
,
649 mid
->sequence_number
);
651 cifs_dbg(VFS
, "SMB signature verification returned error = %d\n",
655 /* BB special case reconnect tid and uid here? */
656 return map_smb_to_linux_error(mid
->resp_buf
, log_error
);
660 cifs_setup_request(struct cifs_ses
*ses
, struct smb_rqst
*rqst
)
663 struct smb_hdr
*hdr
= (struct smb_hdr
*)rqst
->rq_iov
[0].iov_base
;
664 struct mid_q_entry
*mid
;
666 if (rqst
->rq_iov
[0].iov_len
!= 4 ||
667 rqst
->rq_iov
[0].iov_base
+ 4 != rqst
->rq_iov
[1].iov_base
)
668 return ERR_PTR(-EIO
);
670 rc
= allocate_mid(ses
, hdr
, &mid
);
673 rc
= cifs_sign_rqst(rqst
, ses
->server
, &mid
->sequence_number
);
675 cifs_delete_mid(mid
);
682 cifs_send_recv(const unsigned int xid
, struct cifs_ses
*ses
,
683 struct smb_rqst
*rqst
, int *resp_buf_type
, const int flags
,
684 struct kvec
*resp_iov
)
688 struct mid_q_entry
*midQ
;
689 unsigned int credits
= 1;
692 timeout
= flags
& CIFS_TIMEOUT_MASK
;
693 optype
= flags
& CIFS_OP_MASK
;
695 *resp_buf_type
= CIFS_NO_BUFFER
; /* no response buf yet */
697 if ((ses
== NULL
) || (ses
->server
== NULL
)) {
698 cifs_dbg(VFS
, "Null session\n");
702 if (ses
->server
->tcpStatus
== CifsExiting
)
706 * Ensure that we do not send more than 50 overlapping requests
707 * to the same server. We may make this configurable later or
711 rc
= wait_for_free_request(ses
->server
, timeout
, optype
);
716 * Make sure that we sign in the same order that we send on this socket
717 * and avoid races inside tcp sendmsg code that could cause corruption
721 mutex_lock(&ses
->server
->srv_mutex
);
723 midQ
= ses
->server
->ops
->setup_request(ses
, rqst
);
725 mutex_unlock(&ses
->server
->srv_mutex
);
726 /* Update # of requests on wire to server */
727 add_credits(ses
->server
, 1, optype
);
728 return PTR_ERR(midQ
);
731 midQ
->mid_state
= MID_REQUEST_SUBMITTED
;
732 cifs_in_send_inc(ses
->server
);
733 rc
= smb_send_rqst(ses
->server
, rqst
, flags
);
734 cifs_in_send_dec(ses
->server
);
735 cifs_save_when_sent(midQ
);
738 ses
->server
->sequence_number
-= 2;
739 mutex_unlock(&ses
->server
->srv_mutex
);
744 if (timeout
== CIFS_ASYNC_OP
)
747 rc
= wait_for_response(ses
->server
, midQ
);
749 cifs_dbg(FYI
, "Cancelling wait for mid %llu\n", midQ
->mid
);
750 send_cancel(ses
->server
, rqst
, midQ
);
751 spin_lock(&GlobalMid_Lock
);
752 if (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) {
753 midQ
->mid_flags
|= MID_WAIT_CANCELLED
;
754 midQ
->callback
= DeleteMidQEntry
;
755 spin_unlock(&GlobalMid_Lock
);
756 add_credits(ses
->server
, 1, optype
);
759 spin_unlock(&GlobalMid_Lock
);
762 rc
= cifs_sync_mid_result(midQ
, ses
->server
);
764 add_credits(ses
->server
, 1, optype
);
768 if (!midQ
->resp_buf
|| midQ
->mid_state
!= MID_RESPONSE_RECEIVED
) {
770 cifs_dbg(FYI
, "Bad MID state?\n");
774 buf
= (char *)midQ
->resp_buf
;
775 resp_iov
->iov_base
= buf
;
776 resp_iov
->iov_len
= get_rfc1002_length(buf
) + 4;
778 *resp_buf_type
= CIFS_LARGE_BUFFER
;
780 *resp_buf_type
= CIFS_SMALL_BUFFER
;
782 credits
= ses
->server
->ops
->get_credits(midQ
);
784 rc
= ses
->server
->ops
->check_receive(midQ
, ses
->server
,
785 flags
& CIFS_LOG_ERROR
);
787 /* mark it so buf will not be freed by cifs_delete_mid */
788 if ((flags
& CIFS_NO_RESP
) == 0)
789 midQ
->resp_buf
= NULL
;
791 cifs_delete_mid(midQ
);
792 add_credits(ses
->server
, credits
, optype
);
798 SendReceive2(const unsigned int xid
, struct cifs_ses
*ses
,
799 struct kvec
*iov
, int n_vec
, int *resp_buf_type
/* ret */,
800 const int flags
, struct kvec
*resp_iov
)
802 struct smb_rqst rqst
;
803 struct kvec
*new_iov
;
806 new_iov
= kmalloc(sizeof(struct kvec
) * (n_vec
+ 1), GFP_KERNEL
);
810 /* 1st iov is a RFC1001 length followed by the rest of the packet */
811 memcpy(new_iov
+ 1, iov
, (sizeof(struct kvec
) * n_vec
));
813 new_iov
[0].iov_base
= new_iov
[1].iov_base
;
814 new_iov
[0].iov_len
= 4;
815 new_iov
[1].iov_base
+= 4;
816 new_iov
[1].iov_len
-= 4;
818 memset(&rqst
, 0, sizeof(struct smb_rqst
));
819 rqst
.rq_iov
= new_iov
;
820 rqst
.rq_nvec
= n_vec
+ 1;
822 rc
= cifs_send_recv(xid
, ses
, &rqst
, resp_buf_type
, flags
, resp_iov
);
828 SendReceive(const unsigned int xid
, struct cifs_ses
*ses
,
829 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
830 int *pbytes_returned
, const int timeout
)
833 struct mid_q_entry
*midQ
;
834 unsigned int len
= be32_to_cpu(in_buf
->smb_buf_length
);
835 struct kvec iov
= { .iov_base
= in_buf
, .iov_len
= len
};
836 struct smb_rqst rqst
= { .rq_iov
= &iov
, .rq_nvec
= 1 };
839 cifs_dbg(VFS
, "Null smb session\n");
842 if (ses
->server
== NULL
) {
843 cifs_dbg(VFS
, "Null tcp session\n");
847 if (ses
->server
->tcpStatus
== CifsExiting
)
850 /* Ensure that we do not send more than 50 overlapping requests
851 to the same server. We may make this configurable later or
854 if (len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
855 cifs_dbg(VFS
, "Illegal length, greater than maximum frame, %d\n",
860 rc
= wait_for_free_request(ses
->server
, timeout
, 0);
864 /* make sure that we sign in the same order that we send on this socket
865 and avoid races inside tcp sendmsg code that could cause corruption
868 mutex_lock(&ses
->server
->srv_mutex
);
870 rc
= allocate_mid(ses
, in_buf
, &midQ
);
872 mutex_unlock(&ses
->server
->srv_mutex
);
873 /* Update # of requests on wire to server */
874 add_credits(ses
->server
, 1, 0);
878 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
880 mutex_unlock(&ses
->server
->srv_mutex
);
884 midQ
->mid_state
= MID_REQUEST_SUBMITTED
;
886 cifs_in_send_inc(ses
->server
);
887 rc
= smb_send(ses
->server
, in_buf
, len
);
888 cifs_in_send_dec(ses
->server
);
889 cifs_save_when_sent(midQ
);
892 ses
->server
->sequence_number
-= 2;
894 mutex_unlock(&ses
->server
->srv_mutex
);
899 if (timeout
== CIFS_ASYNC_OP
)
902 rc
= wait_for_response(ses
->server
, midQ
);
904 send_cancel(ses
->server
, &rqst
, midQ
);
905 spin_lock(&GlobalMid_Lock
);
906 if (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) {
907 /* no longer considered to be "in-flight" */
908 midQ
->callback
= DeleteMidQEntry
;
909 spin_unlock(&GlobalMid_Lock
);
910 add_credits(ses
->server
, 1, 0);
913 spin_unlock(&GlobalMid_Lock
);
916 rc
= cifs_sync_mid_result(midQ
, ses
->server
);
918 add_credits(ses
->server
, 1, 0);
922 if (!midQ
->resp_buf
|| !out_buf
||
923 midQ
->mid_state
!= MID_RESPONSE_RECEIVED
) {
925 cifs_dbg(VFS
, "Bad MID state?\n");
929 *pbytes_returned
= get_rfc1002_length(midQ
->resp_buf
);
930 memcpy(out_buf
, midQ
->resp_buf
, *pbytes_returned
+ 4);
931 rc
= cifs_check_receive(midQ
, ses
->server
, 0);
933 cifs_delete_mid(midQ
);
934 add_credits(ses
->server
, 1, 0);
939 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
940 blocking lock to return. */
943 send_lock_cancel(const unsigned int xid
, struct cifs_tcon
*tcon
,
944 struct smb_hdr
*in_buf
,
945 struct smb_hdr
*out_buf
)
948 struct cifs_ses
*ses
= tcon
->ses
;
949 LOCK_REQ
*pSMB
= (LOCK_REQ
*)in_buf
;
951 /* We just modify the current in_buf to change
952 the type of lock from LOCKING_ANDX_SHARED_LOCK
953 or LOCKING_ANDX_EXCLUSIVE_LOCK to
954 LOCKING_ANDX_CANCEL_LOCK. */
956 pSMB
->LockType
= LOCKING_ANDX_CANCEL_LOCK
|LOCKING_ANDX_LARGE_FILES
;
958 pSMB
->hdr
.Mid
= get_next_mid(ses
->server
);
960 return SendReceive(xid
, ses
, in_buf
, out_buf
,
965 SendReceiveBlockingLock(const unsigned int xid
, struct cifs_tcon
*tcon
,
966 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
967 int *pbytes_returned
)
971 struct mid_q_entry
*midQ
;
972 struct cifs_ses
*ses
;
973 unsigned int len
= be32_to_cpu(in_buf
->smb_buf_length
);
974 struct kvec iov
= { .iov_base
= in_buf
, .iov_len
= len
};
975 struct smb_rqst rqst
= { .rq_iov
= &iov
, .rq_nvec
= 1 };
977 if (tcon
== NULL
|| tcon
->ses
== NULL
) {
978 cifs_dbg(VFS
, "Null smb session\n");
983 if (ses
->server
== NULL
) {
984 cifs_dbg(VFS
, "Null tcp session\n");
988 if (ses
->server
->tcpStatus
== CifsExiting
)
991 /* Ensure that we do not send more than 50 overlapping requests
992 to the same server. We may make this configurable later or
995 if (len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
996 cifs_dbg(VFS
, "Illegal length, greater than maximum frame, %d\n",
1001 rc
= wait_for_free_request(ses
->server
, CIFS_BLOCKING_OP
, 0);
1005 /* make sure that we sign in the same order that we send on this socket
1006 and avoid races inside tcp sendmsg code that could cause corruption
1009 mutex_lock(&ses
->server
->srv_mutex
);
1011 rc
= allocate_mid(ses
, in_buf
, &midQ
);
1013 mutex_unlock(&ses
->server
->srv_mutex
);
1017 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
1019 cifs_delete_mid(midQ
);
1020 mutex_unlock(&ses
->server
->srv_mutex
);
1024 midQ
->mid_state
= MID_REQUEST_SUBMITTED
;
1025 cifs_in_send_inc(ses
->server
);
1026 rc
= smb_send(ses
->server
, in_buf
, len
);
1027 cifs_in_send_dec(ses
->server
);
1028 cifs_save_when_sent(midQ
);
1031 ses
->server
->sequence_number
-= 2;
1033 mutex_unlock(&ses
->server
->srv_mutex
);
1036 cifs_delete_mid(midQ
);
1040 /* Wait for a reply - allow signals to interrupt. */
1041 rc
= wait_event_interruptible(ses
->server
->response_q
,
1042 (!(midQ
->mid_state
== MID_REQUEST_SUBMITTED
)) ||
1043 ((ses
->server
->tcpStatus
!= CifsGood
) &&
1044 (ses
->server
->tcpStatus
!= CifsNew
)));
1046 /* Were we interrupted by a signal ? */
1047 if ((rc
== -ERESTARTSYS
) &&
1048 (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) &&
1049 ((ses
->server
->tcpStatus
== CifsGood
) ||
1050 (ses
->server
->tcpStatus
== CifsNew
))) {
1052 if (in_buf
->Command
== SMB_COM_TRANSACTION2
) {
1053 /* POSIX lock. We send a NT_CANCEL SMB to cause the
1054 blocking lock to return. */
1055 rc
= send_cancel(ses
->server
, &rqst
, midQ
);
1057 cifs_delete_mid(midQ
);
1061 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
1062 to cause the blocking lock to return. */
1064 rc
= send_lock_cancel(xid
, tcon
, in_buf
, out_buf
);
1066 /* If we get -ENOLCK back the lock may have
1067 already been removed. Don't exit in this case. */
1068 if (rc
&& rc
!= -ENOLCK
) {
1069 cifs_delete_mid(midQ
);
1074 rc
= wait_for_response(ses
->server
, midQ
);
1076 send_cancel(ses
->server
, &rqst
, midQ
);
1077 spin_lock(&GlobalMid_Lock
);
1078 if (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) {
1079 /* no longer considered to be "in-flight" */
1080 midQ
->callback
= DeleteMidQEntry
;
1081 spin_unlock(&GlobalMid_Lock
);
1084 spin_unlock(&GlobalMid_Lock
);
1087 /* We got the response - restart system call. */
1091 rc
= cifs_sync_mid_result(midQ
, ses
->server
);
1095 /* rcvd frame is ok */
1096 if (out_buf
== NULL
|| midQ
->mid_state
!= MID_RESPONSE_RECEIVED
) {
1098 cifs_dbg(VFS
, "Bad MID state?\n");
1102 *pbytes_returned
= get_rfc1002_length(midQ
->resp_buf
);
1103 memcpy(out_buf
, midQ
->resp_buf
, *pbytes_returned
+ 4);
1104 rc
= cifs_check_receive(midQ
, ses
->server
, 0);
1106 cifs_delete_mid(midQ
);
1107 if (rstart
&& rc
== -EACCES
)
1108 return -ERESTARTSYS
;