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"
40 #include "smbdirect.h"
42 /* Max number of iovectors we can use off the stack when sending requests. */
43 #define CIFS_MAX_IOV_SIZE 8
46 cifs_wake_up_task(struct mid_q_entry
*mid
)
48 wake_up_process(mid
->callback_data
);
52 AllocMidQEntry(const struct smb_hdr
*smb_buffer
, struct TCP_Server_Info
*server
)
54 struct mid_q_entry
*temp
;
57 cifs_dbg(VFS
, "Null TCP session in AllocMidQEntry\n");
61 temp
= mempool_alloc(cifs_mid_poolp
, GFP_NOFS
);
62 memset(temp
, 0, sizeof(struct mid_q_entry
));
63 temp
->mid
= get_mid(smb_buffer
);
64 temp
->pid
= current
->pid
;
65 temp
->command
= cpu_to_le16(smb_buffer
->Command
);
66 cifs_dbg(FYI
, "For smb_command %d\n", smb_buffer
->Command
);
67 /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */
68 /* when mid allocated can be before when sent */
69 temp
->when_alloc
= jiffies
;
70 temp
->server
= server
;
73 * The default is for the mid to be synchronous, so the
74 * default callback just wakes up the current task.
76 temp
->callback
= cifs_wake_up_task
;
77 temp
->callback_data
= current
;
79 atomic_inc(&midCount
);
80 temp
->mid_state
= MID_REQUEST_ALLOCATED
;
85 DeleteMidQEntry(struct mid_q_entry
*midEntry
)
87 #ifdef CONFIG_CIFS_STATS2
88 __le16 command
= midEntry
->server
->vals
->lock_cmd
;
91 midEntry
->mid_state
= MID_FREE
;
92 atomic_dec(&midCount
);
93 if (midEntry
->large_buf
)
94 cifs_buf_release(midEntry
->resp_buf
);
96 cifs_small_buf_release(midEntry
->resp_buf
);
97 #ifdef CONFIG_CIFS_STATS2
99 /* commands taking longer than one second are indications that
100 something is wrong, unless it is quite a slow link or server */
101 if (time_after(now
, midEntry
->when_alloc
+ HZ
)) {
102 if ((cifsFYI
& CIFS_TIMER
) && (midEntry
->command
!= command
)) {
103 pr_debug(" CIFS slow rsp: cmd %d mid %llu",
104 midEntry
->command
, midEntry
->mid
);
105 pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n",
106 now
- midEntry
->when_alloc
,
107 now
- midEntry
->when_sent
,
108 now
- midEntry
->when_received
);
112 mempool_free(midEntry
, cifs_mid_poolp
);
116 cifs_delete_mid(struct mid_q_entry
*mid
)
118 spin_lock(&GlobalMid_Lock
);
119 list_del(&mid
->qhead
);
120 spin_unlock(&GlobalMid_Lock
);
122 DeleteMidQEntry(mid
);
126 * smb_send_kvec - send an array of kvecs to the server
127 * @server: Server to send the data to
128 * @smb_msg: Message to send
129 * @sent: amount of data sent on socket is stored here
131 * Our basic "send data to server" function. Should be called with srv_mutex
132 * held. The caller is responsible for handling the results.
135 smb_send_kvec(struct TCP_Server_Info
*server
, struct msghdr
*smb_msg
,
140 struct socket
*ssocket
= server
->ssocket
;
144 smb_msg
->msg_name
= (struct sockaddr
*) &server
->dstaddr
;
145 smb_msg
->msg_namelen
= sizeof(struct sockaddr
);
146 smb_msg
->msg_control
= NULL
;
147 smb_msg
->msg_controllen
= 0;
148 if (server
->noblocksnd
)
149 smb_msg
->msg_flags
= MSG_DONTWAIT
+ MSG_NOSIGNAL
;
151 smb_msg
->msg_flags
= MSG_NOSIGNAL
;
153 while (msg_data_left(smb_msg
)) {
155 * If blocking send, we try 3 times, since each can block
156 * for 5 seconds. For nonblocking we have to try more
157 * but wait increasing amounts of time allowing time for
158 * socket to clear. The overall time we wait in either
159 * case to send on the socket is about 15 seconds.
160 * Similarly we wait for 15 seconds for a response from
161 * the server in SendReceive[2] for the server to send
162 * a response back for most types of requests (except
163 * SMB Write past end of file which can be slow, and
164 * blocking lock operations). NFS waits slightly longer
165 * than CIFS, but this can make it take longer for
166 * nonresponsive servers to be detected and 15 seconds
167 * is more than enough time for modern networks to
168 * send a packet. In most cases if we fail to send
169 * after the retries we will kill the socket and
170 * reconnect which may clear the network problem.
172 rc
= sock_sendmsg(ssocket
, smb_msg
);
176 (!server
->noblocksnd
&& (retries
> 2))) {
177 cifs_dbg(VFS
, "sends on sock %p stuck for 15 seconds\n",
181 msleep(1 << retries
);
189 /* should never happen, letting socket clear before
190 retrying is our only obvious option here */
191 cifs_dbg(VFS
, "tcp sent no data\n");
196 /* send was at least partially successful */
198 retries
= 0; /* in case we get ENOSPC on the next send */
204 rqst_len(struct smb_rqst
*rqst
)
207 struct kvec
*iov
= rqst
->rq_iov
;
208 unsigned long buflen
= 0;
210 /* total up iov array first */
211 for (i
= 0; i
< rqst
->rq_nvec
; i
++)
212 buflen
+= iov
[i
].iov_len
;
214 /* add in the page array if there is one */
215 if (rqst
->rq_npages
) {
216 buflen
+= rqst
->rq_pagesz
* (rqst
->rq_npages
- 1);
217 buflen
+= rqst
->rq_tailsz
;
224 __smb_send_rqst(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
)
227 struct kvec
*iov
= rqst
->rq_iov
;
228 int n_vec
= rqst
->rq_nvec
;
229 unsigned int smb_buf_length
= get_rfc1002_length(iov
[0].iov_base
);
230 unsigned long send_length
;
232 size_t total_len
= 0, sent
, size
;
233 struct socket
*ssocket
= server
->ssocket
;
234 struct msghdr smb_msg
;
236 if (cifs_rdma_enabled(server
) && server
->smbd_conn
) {
237 rc
= smbd_send(server
->smbd_conn
, rqst
);
243 /* sanity check send length */
244 send_length
= rqst_len(rqst
);
245 if (send_length
!= smb_buf_length
+ 4) {
246 WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n",
247 send_length
, smb_buf_length
);
254 cifs_dbg(FYI
, "Sending smb: smb_len=%u\n", smb_buf_length
);
255 dump_smb(iov
[0].iov_base
, iov
[0].iov_len
);
256 dump_smb(iov
[1].iov_base
, iov
[1].iov_len
);
258 /* cork the socket */
259 kernel_setsockopt(ssocket
, SOL_TCP
, TCP_CORK
,
260 (char *)&val
, sizeof(val
));
263 for (i
= 0; i
< n_vec
; i
++)
264 size
+= iov
[i
].iov_len
;
266 iov_iter_kvec(&smb_msg
.msg_iter
, WRITE
| ITER_KVEC
, iov
, n_vec
, size
);
268 rc
= smb_send_kvec(server
, &smb_msg
, &sent
);
274 /* now walk the page array and send each page in it */
275 for (i
= 0; i
< rqst
->rq_npages
; i
++) {
276 size_t len
= i
== rqst
->rq_npages
- 1
279 struct bio_vec bvec
= {
280 .bv_page
= rqst
->rq_pages
[i
],
283 iov_iter_bvec(&smb_msg
.msg_iter
, WRITE
| ITER_BVEC
,
285 rc
= smb_send_kvec(server
, &smb_msg
, &sent
);
295 kernel_setsockopt(ssocket
, SOL_TCP
, TCP_CORK
,
296 (char *)&val
, sizeof(val
));
298 if ((total_len
> 0) && (total_len
!= smb_buf_length
+ 4)) {
299 cifs_dbg(FYI
, "partial send (wanted=%u sent=%zu): terminating session\n",
300 smb_buf_length
+ 4, total_len
);
302 * If we have only sent part of an SMB then the next SMB could
303 * be taken as the remainder of this one. We need to kill the
304 * socket so the server throws away the partial SMB
306 server
->tcpStatus
= CifsNeedReconnect
;
309 if (rc
< 0 && rc
!= -EINTR
)
310 cifs_dbg(VFS
, "Error %d sending data on socket to server\n",
319 smb_send_rqst(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
, int flags
)
321 struct smb_rqst cur_rqst
;
324 if (!(flags
& CIFS_TRANSFORM_REQ
))
325 return __smb_send_rqst(server
, rqst
);
327 if (!server
->ops
->init_transform_rq
||
328 !server
->ops
->free_transform_rq
) {
329 cifs_dbg(VFS
, "Encryption requested but transform callbacks are missed\n");
333 rc
= server
->ops
->init_transform_rq(server
, &cur_rqst
, rqst
);
337 rc
= __smb_send_rqst(server
, &cur_rqst
);
338 server
->ops
->free_transform_rq(&cur_rqst
);
343 smb_send(struct TCP_Server_Info
*server
, struct smb_hdr
*smb_buffer
,
344 unsigned int smb_buf_length
)
347 struct smb_rqst rqst
= { .rq_iov
= iov
,
350 iov
[0].iov_base
= smb_buffer
;
352 iov
[1].iov_base
= (char *)smb_buffer
+ 4;
353 iov
[1].iov_len
= smb_buf_length
;
355 return __smb_send_rqst(server
, &rqst
);
359 wait_for_free_credits(struct TCP_Server_Info
*server
, const int timeout
,
364 spin_lock(&server
->req_lock
);
365 if (timeout
== CIFS_ASYNC_OP
) {
366 /* oplock breaks must not be held up */
369 spin_unlock(&server
->req_lock
);
375 spin_unlock(&server
->req_lock
);
376 cifs_num_waiters_inc(server
);
377 rc
= wait_event_killable(server
->request_q
,
378 has_credits(server
, credits
));
379 cifs_num_waiters_dec(server
);
382 spin_lock(&server
->req_lock
);
384 if (server
->tcpStatus
== CifsExiting
) {
385 spin_unlock(&server
->req_lock
);
390 * Can not count locking commands against total
391 * as they are allowed to block on server.
394 /* update # of requests on the wire to server */
395 if (timeout
!= CIFS_BLOCKING_OP
) {
399 spin_unlock(&server
->req_lock
);
407 wait_for_free_request(struct TCP_Server_Info
*server
, const int timeout
,
412 val
= server
->ops
->get_credits_field(server
, optype
);
413 /* Since an echo is already inflight, no need to wait to send another */
414 if (*val
<= 0 && optype
== CIFS_ECHO_OP
)
416 return wait_for_free_credits(server
, timeout
, val
);
420 cifs_wait_mtu_credits(struct TCP_Server_Info
*server
, unsigned int size
,
421 unsigned int *num
, unsigned int *credits
)
428 static int allocate_mid(struct cifs_ses
*ses
, struct smb_hdr
*in_buf
,
429 struct mid_q_entry
**ppmidQ
)
431 if (ses
->server
->tcpStatus
== CifsExiting
) {
435 if (ses
->server
->tcpStatus
== CifsNeedReconnect
) {
436 cifs_dbg(FYI
, "tcp session dead - return to caller to retry\n");
440 if (ses
->status
== CifsNew
) {
441 if ((in_buf
->Command
!= SMB_COM_SESSION_SETUP_ANDX
) &&
442 (in_buf
->Command
!= SMB_COM_NEGOTIATE
))
444 /* else ok - we are setting up session */
447 if (ses
->status
== CifsExiting
) {
448 /* check if SMB session is bad because we are setting it up */
449 if (in_buf
->Command
!= SMB_COM_LOGOFF_ANDX
)
451 /* else ok - we are shutting down session */
454 *ppmidQ
= AllocMidQEntry(in_buf
, ses
->server
);
457 spin_lock(&GlobalMid_Lock
);
458 list_add_tail(&(*ppmidQ
)->qhead
, &ses
->server
->pending_mid_q
);
459 spin_unlock(&GlobalMid_Lock
);
464 wait_for_response(struct TCP_Server_Info
*server
, struct mid_q_entry
*midQ
)
468 error
= wait_event_freezekillable_unsafe(server
->response_q
,
469 midQ
->mid_state
!= MID_REQUEST_SUBMITTED
);
477 cifs_setup_async_request(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
)
480 struct smb_hdr
*hdr
= (struct smb_hdr
*)rqst
->rq_iov
[0].iov_base
;
481 struct mid_q_entry
*mid
;
483 if (rqst
->rq_iov
[0].iov_len
!= 4 ||
484 rqst
->rq_iov
[0].iov_base
+ 4 != rqst
->rq_iov
[1].iov_base
)
485 return ERR_PTR(-EIO
);
487 /* enable signing if server requires it */
489 hdr
->Flags2
|= SMBFLG2_SECURITY_SIGNATURE
;
491 mid
= AllocMidQEntry(hdr
, server
);
493 return ERR_PTR(-ENOMEM
);
495 rc
= cifs_sign_rqst(rqst
, server
, &mid
->sequence_number
);
497 DeleteMidQEntry(mid
);
505 * Send a SMB request and set the callback function in the mid to handle
506 * the result. Caller is responsible for dealing with timeouts.
509 cifs_call_async(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
,
510 mid_receive_t
*receive
, mid_callback_t
*callback
,
511 mid_handle_t
*handle
, void *cbdata
, const int flags
)
513 int rc
, timeout
, optype
;
514 struct mid_q_entry
*mid
;
515 unsigned int credits
= 0;
517 timeout
= flags
& CIFS_TIMEOUT_MASK
;
518 optype
= flags
& CIFS_OP_MASK
;
520 if ((flags
& CIFS_HAS_CREDITS
) == 0) {
521 rc
= wait_for_free_request(server
, timeout
, optype
);
527 mutex_lock(&server
->srv_mutex
);
528 mid
= server
->ops
->setup_async_request(server
, rqst
);
530 mutex_unlock(&server
->srv_mutex
);
531 add_credits_and_wake_if(server
, credits
, optype
);
535 mid
->receive
= receive
;
536 mid
->callback
= callback
;
537 mid
->callback_data
= cbdata
;
538 mid
->handle
= handle
;
539 mid
->mid_state
= MID_REQUEST_SUBMITTED
;
541 /* put it on the pending_mid_q */
542 spin_lock(&GlobalMid_Lock
);
543 list_add_tail(&mid
->qhead
, &server
->pending_mid_q
);
544 spin_unlock(&GlobalMid_Lock
);
547 * Need to store the time in mid before calling I/O. For call_async,
548 * I/O response may come back and free the mid entry on another thread.
550 cifs_save_when_sent(mid
);
551 cifs_in_send_inc(server
);
552 rc
= smb_send_rqst(server
, rqst
, flags
);
553 cifs_in_send_dec(server
);
556 server
->sequence_number
-= 2;
557 cifs_delete_mid(mid
);
560 mutex_unlock(&server
->srv_mutex
);
565 add_credits_and_wake_if(server
, credits
, optype
);
571 * Send an SMB Request. No response info (other than return code)
572 * needs to be parsed.
574 * flags indicate the type of request buffer and how long to wait
575 * and whether to log NT STATUS code (error) before mapping it to POSIX error
579 SendReceiveNoRsp(const unsigned int xid
, struct cifs_ses
*ses
,
580 char *in_buf
, int flags
)
587 iov
[0].iov_base
= in_buf
;
588 iov
[0].iov_len
= get_rfc1002_length(in_buf
) + 4;
589 flags
|= CIFS_NO_RESP
;
590 rc
= SendReceive2(xid
, ses
, iov
, 1, &resp_buf_type
, flags
, &rsp_iov
);
591 cifs_dbg(NOISY
, "SendRcvNoRsp flags %d rc %d\n", flags
, rc
);
597 cifs_sync_mid_result(struct mid_q_entry
*mid
, struct TCP_Server_Info
*server
)
601 cifs_dbg(FYI
, "%s: cmd=%d mid=%llu state=%d\n",
602 __func__
, le16_to_cpu(mid
->command
), mid
->mid
, mid
->mid_state
);
604 spin_lock(&GlobalMid_Lock
);
605 switch (mid
->mid_state
) {
606 case MID_RESPONSE_RECEIVED
:
607 spin_unlock(&GlobalMid_Lock
);
609 case MID_RETRY_NEEDED
:
612 case MID_RESPONSE_MALFORMED
:
619 list_del_init(&mid
->qhead
);
620 cifs_dbg(VFS
, "%s: invalid mid state mid=%llu state=%d\n",
621 __func__
, mid
->mid
, mid
->mid_state
);
624 spin_unlock(&GlobalMid_Lock
);
626 DeleteMidQEntry(mid
);
631 send_cancel(struct TCP_Server_Info
*server
, struct smb_rqst
*rqst
,
632 struct mid_q_entry
*mid
)
634 return server
->ops
->send_cancel
?
635 server
->ops
->send_cancel(server
, rqst
, mid
) : 0;
639 cifs_check_receive(struct mid_q_entry
*mid
, struct TCP_Server_Info
*server
,
642 unsigned int len
= get_rfc1002_length(mid
->resp_buf
) + 4;
644 dump_smb(mid
->resp_buf
, min_t(u32
, 92, len
));
646 /* convert the length into a more usable form */
650 struct smb_rqst rqst
= { .rq_iov
= iov
,
653 iov
[0].iov_base
= mid
->resp_buf
;
655 iov
[1].iov_base
= (char *)mid
->resp_buf
+ 4;
656 iov
[1].iov_len
= len
- 4;
657 /* FIXME: add code to kill session */
658 rc
= cifs_verify_signature(&rqst
, server
,
659 mid
->sequence_number
);
661 cifs_dbg(VFS
, "SMB signature verification returned error = %d\n",
665 /* BB special case reconnect tid and uid here? */
666 return map_smb_to_linux_error(mid
->resp_buf
, log_error
);
670 cifs_setup_request(struct cifs_ses
*ses
, struct smb_rqst
*rqst
)
673 struct smb_hdr
*hdr
= (struct smb_hdr
*)rqst
->rq_iov
[0].iov_base
;
674 struct mid_q_entry
*mid
;
676 if (rqst
->rq_iov
[0].iov_len
!= 4 ||
677 rqst
->rq_iov
[0].iov_base
+ 4 != rqst
->rq_iov
[1].iov_base
)
678 return ERR_PTR(-EIO
);
680 rc
= allocate_mid(ses
, hdr
, &mid
);
683 rc
= cifs_sign_rqst(rqst
, ses
->server
, &mid
->sequence_number
);
685 cifs_delete_mid(mid
);
692 cifs_send_recv(const unsigned int xid
, struct cifs_ses
*ses
,
693 struct smb_rqst
*rqst
, int *resp_buf_type
, const int flags
,
694 struct kvec
*resp_iov
)
698 struct mid_q_entry
*midQ
;
699 unsigned int credits
= 1;
702 timeout
= flags
& CIFS_TIMEOUT_MASK
;
703 optype
= flags
& CIFS_OP_MASK
;
705 *resp_buf_type
= CIFS_NO_BUFFER
; /* no response buf yet */
707 if ((ses
== NULL
) || (ses
->server
== NULL
)) {
708 cifs_dbg(VFS
, "Null session\n");
712 if (ses
->server
->tcpStatus
== CifsExiting
)
716 * Ensure that we do not send more than 50 overlapping requests
717 * to the same server. We may make this configurable later or
721 rc
= wait_for_free_request(ses
->server
, timeout
, optype
);
726 * Make sure that we sign in the same order that we send on this socket
727 * and avoid races inside tcp sendmsg code that could cause corruption
731 mutex_lock(&ses
->server
->srv_mutex
);
733 midQ
= ses
->server
->ops
->setup_request(ses
, rqst
);
735 mutex_unlock(&ses
->server
->srv_mutex
);
736 /* Update # of requests on wire to server */
737 add_credits(ses
->server
, 1, optype
);
738 return PTR_ERR(midQ
);
741 midQ
->mid_state
= MID_REQUEST_SUBMITTED
;
742 cifs_in_send_inc(ses
->server
);
743 rc
= smb_send_rqst(ses
->server
, rqst
, flags
);
744 cifs_in_send_dec(ses
->server
);
745 cifs_save_when_sent(midQ
);
748 ses
->server
->sequence_number
-= 2;
749 mutex_unlock(&ses
->server
->srv_mutex
);
754 if (timeout
== CIFS_ASYNC_OP
)
757 rc
= wait_for_response(ses
->server
, midQ
);
759 cifs_dbg(FYI
, "Cancelling wait for mid %llu\n", midQ
->mid
);
760 send_cancel(ses
->server
, rqst
, midQ
);
761 spin_lock(&GlobalMid_Lock
);
762 if (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) {
763 midQ
->mid_flags
|= MID_WAIT_CANCELLED
;
764 midQ
->callback
= DeleteMidQEntry
;
765 spin_unlock(&GlobalMid_Lock
);
766 add_credits(ses
->server
, 1, optype
);
769 spin_unlock(&GlobalMid_Lock
);
772 rc
= cifs_sync_mid_result(midQ
, ses
->server
);
774 add_credits(ses
->server
, 1, optype
);
778 if (!midQ
->resp_buf
|| midQ
->mid_state
!= MID_RESPONSE_RECEIVED
) {
780 cifs_dbg(FYI
, "Bad MID state?\n");
784 buf
= (char *)midQ
->resp_buf
;
785 resp_iov
->iov_base
= buf
;
786 resp_iov
->iov_len
= get_rfc1002_length(buf
) + 4;
788 *resp_buf_type
= CIFS_LARGE_BUFFER
;
790 *resp_buf_type
= CIFS_SMALL_BUFFER
;
792 credits
= ses
->server
->ops
->get_credits(midQ
);
794 rc
= ses
->server
->ops
->check_receive(midQ
, ses
->server
,
795 flags
& CIFS_LOG_ERROR
);
797 /* mark it so buf will not be freed by cifs_delete_mid */
798 if ((flags
& CIFS_NO_RESP
) == 0)
799 midQ
->resp_buf
= NULL
;
801 cifs_delete_mid(midQ
);
802 add_credits(ses
->server
, credits
, optype
);
808 SendReceive2(const unsigned int xid
, struct cifs_ses
*ses
,
809 struct kvec
*iov
, int n_vec
, int *resp_buf_type
/* ret */,
810 const int flags
, struct kvec
*resp_iov
)
812 struct smb_rqst rqst
;
813 struct kvec s_iov
[CIFS_MAX_IOV_SIZE
], *new_iov
;
816 if (n_vec
+ 1 > CIFS_MAX_IOV_SIZE
) {
817 new_iov
= kmalloc(sizeof(struct kvec
) * (n_vec
+ 1),
824 /* 1st iov is a RFC1001 length followed by the rest of the packet */
825 memcpy(new_iov
+ 1, iov
, (sizeof(struct kvec
) * n_vec
));
827 new_iov
[0].iov_base
= new_iov
[1].iov_base
;
828 new_iov
[0].iov_len
= 4;
829 new_iov
[1].iov_base
+= 4;
830 new_iov
[1].iov_len
-= 4;
832 memset(&rqst
, 0, sizeof(struct smb_rqst
));
833 rqst
.rq_iov
= new_iov
;
834 rqst
.rq_nvec
= n_vec
+ 1;
836 rc
= cifs_send_recv(xid
, ses
, &rqst
, resp_buf_type
, flags
, resp_iov
);
837 if (n_vec
+ 1 > CIFS_MAX_IOV_SIZE
)
842 /* Like SendReceive2 but iov[0] does not contain an rfc1002 header */
844 smb2_send_recv(const unsigned int xid
, struct cifs_ses
*ses
,
845 struct kvec
*iov
, int n_vec
, int *resp_buf_type
/* ret */,
846 const int flags
, struct kvec
*resp_iov
)
848 struct smb_rqst rqst
;
849 struct kvec s_iov
[CIFS_MAX_IOV_SIZE
], *new_iov
;
853 __be32 rfc1002_marker
;
855 if (n_vec
+ 1 > CIFS_MAX_IOV_SIZE
) {
856 new_iov
= kmalloc(sizeof(struct kvec
) * (n_vec
+ 1),
863 /* 1st iov is an RFC1002 Session Message length */
864 memcpy(new_iov
+ 1, iov
, (sizeof(struct kvec
) * n_vec
));
867 for (i
= 1; i
< n_vec
+ 1; i
++)
868 count
+= new_iov
[i
].iov_len
;
870 rfc1002_marker
= cpu_to_be32(count
);
872 new_iov
[0].iov_base
= &rfc1002_marker
;
873 new_iov
[0].iov_len
= 4;
875 memset(&rqst
, 0, sizeof(struct smb_rqst
));
876 rqst
.rq_iov
= new_iov
;
877 rqst
.rq_nvec
= n_vec
+ 1;
879 rc
= cifs_send_recv(xid
, ses
, &rqst
, resp_buf_type
, flags
, resp_iov
);
880 if (n_vec
+ 1 > CIFS_MAX_IOV_SIZE
)
886 SendReceive(const unsigned int xid
, struct cifs_ses
*ses
,
887 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
888 int *pbytes_returned
, const int timeout
)
891 struct mid_q_entry
*midQ
;
892 unsigned int len
= be32_to_cpu(in_buf
->smb_buf_length
);
893 struct kvec iov
= { .iov_base
= in_buf
, .iov_len
= len
};
894 struct smb_rqst rqst
= { .rq_iov
= &iov
, .rq_nvec
= 1 };
897 cifs_dbg(VFS
, "Null smb session\n");
900 if (ses
->server
== NULL
) {
901 cifs_dbg(VFS
, "Null tcp session\n");
905 if (ses
->server
->tcpStatus
== CifsExiting
)
908 /* Ensure that we do not send more than 50 overlapping requests
909 to the same server. We may make this configurable later or
912 if (len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
913 cifs_dbg(VFS
, "Illegal length, greater than maximum frame, %d\n",
918 rc
= wait_for_free_request(ses
->server
, timeout
, 0);
922 /* make sure that we sign in the same order that we send on this socket
923 and avoid races inside tcp sendmsg code that could cause corruption
926 mutex_lock(&ses
->server
->srv_mutex
);
928 rc
= allocate_mid(ses
, in_buf
, &midQ
);
930 mutex_unlock(&ses
->server
->srv_mutex
);
931 /* Update # of requests on wire to server */
932 add_credits(ses
->server
, 1, 0);
936 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
938 mutex_unlock(&ses
->server
->srv_mutex
);
942 midQ
->mid_state
= MID_REQUEST_SUBMITTED
;
944 cifs_in_send_inc(ses
->server
);
945 rc
= smb_send(ses
->server
, in_buf
, len
);
946 cifs_in_send_dec(ses
->server
);
947 cifs_save_when_sent(midQ
);
950 ses
->server
->sequence_number
-= 2;
952 mutex_unlock(&ses
->server
->srv_mutex
);
957 if (timeout
== CIFS_ASYNC_OP
)
960 rc
= wait_for_response(ses
->server
, midQ
);
962 send_cancel(ses
->server
, &rqst
, midQ
);
963 spin_lock(&GlobalMid_Lock
);
964 if (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) {
965 /* no longer considered to be "in-flight" */
966 midQ
->callback
= DeleteMidQEntry
;
967 spin_unlock(&GlobalMid_Lock
);
968 add_credits(ses
->server
, 1, 0);
971 spin_unlock(&GlobalMid_Lock
);
974 rc
= cifs_sync_mid_result(midQ
, ses
->server
);
976 add_credits(ses
->server
, 1, 0);
980 if (!midQ
->resp_buf
|| !out_buf
||
981 midQ
->mid_state
!= MID_RESPONSE_RECEIVED
) {
983 cifs_dbg(VFS
, "Bad MID state?\n");
987 *pbytes_returned
= get_rfc1002_length(midQ
->resp_buf
);
988 memcpy(out_buf
, midQ
->resp_buf
, *pbytes_returned
+ 4);
989 rc
= cifs_check_receive(midQ
, ses
->server
, 0);
991 cifs_delete_mid(midQ
);
992 add_credits(ses
->server
, 1, 0);
997 /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows
998 blocking lock to return. */
1001 send_lock_cancel(const unsigned int xid
, struct cifs_tcon
*tcon
,
1002 struct smb_hdr
*in_buf
,
1003 struct smb_hdr
*out_buf
)
1006 struct cifs_ses
*ses
= tcon
->ses
;
1007 LOCK_REQ
*pSMB
= (LOCK_REQ
*)in_buf
;
1009 /* We just modify the current in_buf to change
1010 the type of lock from LOCKING_ANDX_SHARED_LOCK
1011 or LOCKING_ANDX_EXCLUSIVE_LOCK to
1012 LOCKING_ANDX_CANCEL_LOCK. */
1014 pSMB
->LockType
= LOCKING_ANDX_CANCEL_LOCK
|LOCKING_ANDX_LARGE_FILES
;
1016 pSMB
->hdr
.Mid
= get_next_mid(ses
->server
);
1018 return SendReceive(xid
, ses
, in_buf
, out_buf
,
1019 &bytes_returned
, 0);
1023 SendReceiveBlockingLock(const unsigned int xid
, struct cifs_tcon
*tcon
,
1024 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
1025 int *pbytes_returned
)
1029 struct mid_q_entry
*midQ
;
1030 struct cifs_ses
*ses
;
1031 unsigned int len
= be32_to_cpu(in_buf
->smb_buf_length
);
1032 struct kvec iov
= { .iov_base
= in_buf
, .iov_len
= len
};
1033 struct smb_rqst rqst
= { .rq_iov
= &iov
, .rq_nvec
= 1 };
1035 if (tcon
== NULL
|| tcon
->ses
== NULL
) {
1036 cifs_dbg(VFS
, "Null smb session\n");
1041 if (ses
->server
== NULL
) {
1042 cifs_dbg(VFS
, "Null tcp session\n");
1046 if (ses
->server
->tcpStatus
== CifsExiting
)
1049 /* Ensure that we do not send more than 50 overlapping requests
1050 to the same server. We may make this configurable later or
1053 if (len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
1054 cifs_dbg(VFS
, "Illegal length, greater than maximum frame, %d\n",
1059 rc
= wait_for_free_request(ses
->server
, CIFS_BLOCKING_OP
, 0);
1063 /* make sure that we sign in the same order that we send on this socket
1064 and avoid races inside tcp sendmsg code that could cause corruption
1067 mutex_lock(&ses
->server
->srv_mutex
);
1069 rc
= allocate_mid(ses
, in_buf
, &midQ
);
1071 mutex_unlock(&ses
->server
->srv_mutex
);
1075 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
1077 cifs_delete_mid(midQ
);
1078 mutex_unlock(&ses
->server
->srv_mutex
);
1082 midQ
->mid_state
= MID_REQUEST_SUBMITTED
;
1083 cifs_in_send_inc(ses
->server
);
1084 rc
= smb_send(ses
->server
, in_buf
, len
);
1085 cifs_in_send_dec(ses
->server
);
1086 cifs_save_when_sent(midQ
);
1089 ses
->server
->sequence_number
-= 2;
1091 mutex_unlock(&ses
->server
->srv_mutex
);
1094 cifs_delete_mid(midQ
);
1098 /* Wait for a reply - allow signals to interrupt. */
1099 rc
= wait_event_interruptible(ses
->server
->response_q
,
1100 (!(midQ
->mid_state
== MID_REQUEST_SUBMITTED
)) ||
1101 ((ses
->server
->tcpStatus
!= CifsGood
) &&
1102 (ses
->server
->tcpStatus
!= CifsNew
)));
1104 /* Were we interrupted by a signal ? */
1105 if ((rc
== -ERESTARTSYS
) &&
1106 (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) &&
1107 ((ses
->server
->tcpStatus
== CifsGood
) ||
1108 (ses
->server
->tcpStatus
== CifsNew
))) {
1110 if (in_buf
->Command
== SMB_COM_TRANSACTION2
) {
1111 /* POSIX lock. We send a NT_CANCEL SMB to cause the
1112 blocking lock to return. */
1113 rc
= send_cancel(ses
->server
, &rqst
, midQ
);
1115 cifs_delete_mid(midQ
);
1119 /* Windows lock. We send a LOCKINGX_CANCEL_LOCK
1120 to cause the blocking lock to return. */
1122 rc
= send_lock_cancel(xid
, tcon
, in_buf
, out_buf
);
1124 /* If we get -ENOLCK back the lock may have
1125 already been removed. Don't exit in this case. */
1126 if (rc
&& rc
!= -ENOLCK
) {
1127 cifs_delete_mid(midQ
);
1132 rc
= wait_for_response(ses
->server
, midQ
);
1134 send_cancel(ses
->server
, &rqst
, midQ
);
1135 spin_lock(&GlobalMid_Lock
);
1136 if (midQ
->mid_state
== MID_REQUEST_SUBMITTED
) {
1137 /* no longer considered to be "in-flight" */
1138 midQ
->callback
= DeleteMidQEntry
;
1139 spin_unlock(&GlobalMid_Lock
);
1142 spin_unlock(&GlobalMid_Lock
);
1145 /* We got the response - restart system call. */
1149 rc
= cifs_sync_mid_result(midQ
, ses
->server
);
1153 /* rcvd frame is ok */
1154 if (out_buf
== NULL
|| midQ
->mid_state
!= MID_RESPONSE_RECEIVED
) {
1156 cifs_dbg(VFS
, "Bad MID state?\n");
1160 *pbytes_returned
= get_rfc1002_length(midQ
->resp_buf
);
1161 memcpy(out_buf
, midQ
->resp_buf
, *pbytes_returned
+ 4);
1162 rc
= cifs_check_receive(midQ
, ses
->server
, 0);
1164 cifs_delete_mid(midQ
);
1165 if (rstart
&& rc
== -EACCES
)
1166 return -ERESTARTSYS
;