4 * Copyright (C) International Business Machines Corp., 2002,2004
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
,SLAB_KERNEL
| SLAB_NOFS
);
56 memset(temp
, 0, sizeof (struct mid_q_entry
));
57 temp
->mid
= smb_buffer
->Mid
; /* always LE */
58 temp
->pid
= current
->pid
;
59 temp
->command
= smb_buffer
->Command
;
60 cFYI(1, ("For smb_command %d", temp
->command
));
61 do_gettimeofday(&temp
->when_sent
);
66 spin_lock(&GlobalMid_Lock
);
67 list_add_tail(&temp
->qhead
, &ses
->server
->pending_mid_q
);
68 atomic_inc(&midCount
);
69 temp
->midState
= MID_REQUEST_ALLOCATED
;
70 spin_unlock(&GlobalMid_Lock
);
75 DeleteMidQEntry(struct mid_q_entry
*midEntry
)
77 spin_lock(&GlobalMid_Lock
);
78 midEntry
->midState
= MID_FREE
;
79 list_del(&midEntry
->qhead
);
80 atomic_dec(&midCount
);
81 spin_unlock(&GlobalMid_Lock
);
82 cifs_buf_release(midEntry
->resp_buf
);
83 mempool_free(midEntry
, cifs_mid_poolp
);
86 struct oplock_q_entry
*
87 AllocOplockQEntry(struct inode
* pinode
, __u16 fid
, struct cifsTconInfo
* tcon
)
89 struct oplock_q_entry
*temp
;
90 if ((pinode
== NULL
) || (tcon
== NULL
)) {
91 cERROR(1, ("Null parms passed to AllocOplockQEntry"));
94 temp
= (struct oplock_q_entry
*) kmem_cache_alloc(cifs_oplock_cachep
,
99 temp
->pinode
= pinode
;
102 spin_lock(&GlobalMid_Lock
);
103 list_add_tail(&temp
->qhead
, &GlobalOplock_Q
);
104 spin_unlock(&GlobalMid_Lock
);
110 void DeleteOplockQEntry(struct oplock_q_entry
* oplockEntry
)
112 spin_lock(&GlobalMid_Lock
);
113 /* should we check if list empty first? */
114 list_del(&oplockEntry
->qhead
);
115 spin_unlock(&GlobalMid_Lock
);
116 kmem_cache_free(cifs_oplock_cachep
, oplockEntry
);
120 smb_send(struct socket
*ssocket
, struct smb_hdr
*smb_buffer
,
121 unsigned int smb_buf_length
, struct sockaddr
*sin
)
125 struct msghdr smb_msg
;
127 unsigned len
= smb_buf_length
+ 4;
130 return -ENOTSOCK
; /* BB eventually add reconnect code here */
131 iov
.iov_base
= smb_buffer
;
134 smb_msg
.msg_name
= sin
;
135 smb_msg
.msg_namelen
= sizeof (struct sockaddr
);
136 smb_msg
.msg_control
= NULL
;
137 smb_msg
.msg_controllen
= 0;
138 smb_msg
.msg_flags
= MSG_DONTWAIT
+ MSG_NOSIGNAL
; /* BB add more flags?*/
140 /* smb header is converted in header_assemble. bcc and rest of SMB word
141 area, and byte area if necessary, is converted to littleendian in
142 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
143 Flags2 is converted in SendReceive */
145 smb_buffer
->smb_buf_length
= cpu_to_be32(smb_buffer
->smb_buf_length
);
146 cFYI(1, ("Sending smb of length %d ", smb_buf_length
));
147 dump_smb(smb_buffer
, len
);
150 rc
= kernel_sendmsg(ssocket
, &smb_msg
, &iov
, 1, len
);
151 if ((rc
== -ENOSPC
) || (rc
== -EAGAIN
)) {
155 ("sends on sock %p stuck for 30 seconds",
171 cERROR(1,("Error %d sending data on socket to server.", rc
));
179 #ifdef CIFS_EXPERIMENTAL
180 /* BB finish off this function, adding support for writing set of pages as iovec */
181 /* and also adding support for operations that need to parse the response smb */
184 smb_sendv(struct socket
*ssocket
, struct smb_hdr
*smb_buffer
,
185 unsigned int smb_buf_length
, struct kvec
* write_vector
/* page list */, struct sockaddr
*sin
)
189 struct msghdr smb_msg
;
190 number_of_pages
+= 1; /* account for SMB header */
191 struct kvec
* piov
= kmalloc(number_of_pages
* sizeof(struct kvec
));
192 if(i
=0;i
<num_pages
-1;i
++
193 unsigned len
= smb_buf_length
+ 4;
196 return -ENOTSOCK
; /* BB eventually add reconnect code here */
197 iov
.iov_base
= smb_buffer
;
200 smb_msg
.msg_name
= sin
;
201 smb_msg
.msg_namelen
= sizeof (struct sockaddr
);
202 smb_msg
.msg_control
= NULL
;
203 smb_msg
.msg_controllen
= 0;
204 smb_msg
.msg_flags
= MSG_DONTWAIT
+ MSG_NOSIGNAL
; /* BB add more flags?*/
206 /* smb header is converted in header_assemble. bcc and rest of SMB word
207 area, and byte area if necessary, is converted to littleendian in
208 cifssmb.c and RFC1001 len is converted to bigendian in smb_send
209 Flags2 is converted in SendReceive */
211 smb_buffer
->smb_buf_length
= cpu_to_be32(smb_buffer
->smb_buf_length
);
212 cFYI(1, ("Sending smb of length %d ", smb_buf_length
));
213 dump_smb(smb_buffer
, len
);
216 rc
= kernel_sendmsg(ssocket
, &smb_msg
, &iov
, number_of_pages
, len
?);
217 if ((rc
== -ENOSPC
) || (rc
== -EAGAIN
)) {
221 ("sends on sock %p stuck for 30 seconds",
237 cERROR(1,("Error %d sending data on socket to server.", rc
));
247 CIFSSendRcv(const unsigned int xid
, struct cifsSesInfo
*ses
,
248 struct smb_hdr
*in_buf
, struct kvec
* write_vector
/* page list */, int *pbytes_returned
, const int long_op
)
251 unsigned long timeout
= 15 * HZ
;
252 struct mid_q_entry
*midQ
= NULL
;
255 cERROR(1,("Null smb session"));
258 if(ses
->server
== NULL
) {
259 cERROR(1,("Null tcp session"));
262 if(pbytes_returned
== NULL
)
265 *pbytes_returned
= 0;
269 /* Ensure that we do not send more than 50 overlapping requests
270 to the same server. We may make this configurable later or
273 /* oplock breaks must not be held up */
274 atomic_inc(&ses
->server
->inFlight
);
276 spin_lock(&GlobalMid_Lock
);
278 if(atomic_read(&ses
->server
->inFlight
) >= cifs_max_pending
){
279 spin_unlock(&GlobalMid_Lock
);
280 wait_event(ses
->server
->request_q
,
281 atomic_read(&ses
->server
->inFlight
)
283 spin_lock(&GlobalMid_Lock
);
285 if(ses
->server
->tcpStatus
== CifsExiting
) {
286 spin_unlock(&GlobalMid_Lock
);
290 /* can not count locking commands against total since
291 they are allowed to block on server */
294 /* update # of requests on the wire to server */
295 atomic_inc(&ses
->server
->inFlight
);
297 spin_unlock(&GlobalMid_Lock
);
302 /* make sure that we sign in the same order that we send on this socket
303 and avoid races inside tcp sendmsg code that could cause corruption
306 down(&ses
->server
->tcpSem
);
308 if (ses
->server
->tcpStatus
== CifsExiting
) {
311 } else if (ses
->server
->tcpStatus
== CifsNeedReconnect
) {
312 cFYI(1,("tcp session dead - return to caller to retry"));
315 } else if (ses
->status
!= CifsGood
) {
316 /* check if SMB session is bad because we are setting it up */
317 if((in_buf
->Command
!= SMB_COM_SESSION_SETUP_ANDX
) &&
318 (in_buf
->Command
!= SMB_COM_NEGOTIATE
)) {
321 } /* else ok - we are setting up session */
323 midQ
= AllocMidQEntry(in_buf
, ses
);
325 up(&ses
->server
->tcpSem
);
326 /* If not lock req, update # of requests on wire to server */
328 atomic_dec(&ses
->server
->inFlight
);
329 wake_up(&ses
->server
->request_q
);
334 if (in_buf
->smb_buf_length
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
335 up(&ses
->server
->tcpSem
);
337 ("Illegal length, greater than maximum frame, %d ",
338 in_buf
->smb_buf_length
));
339 DeleteMidQEntry(midQ
);
340 /* If not lock req, update # of requests on wire to server */
342 atomic_dec(&ses
->server
->inFlight
);
343 wake_up(&ses
->server
->request_q
);
348 /* BB can we sign efficiently in this path? */
349 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
351 midQ
->midState
= MID_REQUEST_SUBMITTED
;
352 /* rc = smb_sendv(ses->server->ssocket, in_buf, in_buf->smb_buf_length, piovec,
353 (struct sockaddr *) &(ses->server->addr.sockAddr));*/
355 DeleteMidQEntry(midQ
);
356 up(&ses
->server
->tcpSem
);
357 /* If not lock req, update # of requests on wire to server */
359 atomic_dec(&ses
->server
->inFlight
);
360 wake_up(&ses
->server
->request_q
);
364 up(&ses
->server
->tcpSem
);
367 DeleteMidQEntry(midQ
);
370 atomic_dec(&ses
->server
->inFlight
);
371 wake_up(&ses
->server
->request_q
);
378 #endif /* CIFS_EXPERIMENTAL */
381 SendReceive(const unsigned int xid
, struct cifsSesInfo
*ses
,
382 struct smb_hdr
*in_buf
, struct smb_hdr
*out_buf
,
383 int *pbytes_returned
, const int long_op
)
386 unsigned int receive_len
;
387 unsigned long timeout
;
388 struct mid_q_entry
*midQ
;
391 cERROR(1,("Null smb session"));
394 if(ses
->server
== NULL
) {
395 cERROR(1,("Null tcp session"));
399 /* Ensure that we do not send more than 50 overlapping requests
400 to the same server. We may make this configurable later or
403 /* oplock breaks must not be held up */
404 atomic_inc(&ses
->server
->inFlight
);
406 spin_lock(&GlobalMid_Lock
);
408 if(atomic_read(&ses
->server
->inFlight
) >= cifs_max_pending
){
409 spin_unlock(&GlobalMid_Lock
);
410 wait_event(ses
->server
->request_q
,
411 atomic_read(&ses
->server
->inFlight
)
413 spin_lock(&GlobalMid_Lock
);
415 if(ses
->server
->tcpStatus
== CifsExiting
) {
416 spin_unlock(&GlobalMid_Lock
);
420 /* can not count locking commands against total since
421 they are allowed to block on server */
424 /* update # of requests on the wire to server */
425 atomic_inc(&ses
->server
->inFlight
);
427 spin_unlock(&GlobalMid_Lock
);
432 /* make sure that we sign in the same order that we send on this socket
433 and avoid races inside tcp sendmsg code that could cause corruption
436 down(&ses
->server
->tcpSem
);
438 if (ses
->server
->tcpStatus
== CifsExiting
) {
441 } else if (ses
->server
->tcpStatus
== CifsNeedReconnect
) {
442 cFYI(1,("tcp session dead - return to caller to retry"));
445 } else if (ses
->status
!= CifsGood
) {
446 /* check if SMB session is bad because we are setting it up */
447 if((in_buf
->Command
!= SMB_COM_SESSION_SETUP_ANDX
) &&
448 (in_buf
->Command
!= SMB_COM_NEGOTIATE
)) {
451 } /* else ok - we are setting up session */
453 midQ
= AllocMidQEntry(in_buf
, ses
);
455 up(&ses
->server
->tcpSem
);
456 /* If not lock req, update # of requests on wire to server */
458 atomic_dec(&ses
->server
->inFlight
);
459 wake_up(&ses
->server
->request_q
);
464 if (in_buf
->smb_buf_length
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
- 4) {
465 up(&ses
->server
->tcpSem
);
467 ("Illegal length, greater than maximum frame, %d ",
468 in_buf
->smb_buf_length
));
469 DeleteMidQEntry(midQ
);
470 /* If not lock req, update # of requests on wire to server */
472 atomic_dec(&ses
->server
->inFlight
);
473 wake_up(&ses
->server
->request_q
);
478 rc
= cifs_sign_smb(in_buf
, ses
->server
, &midQ
->sequence_number
);
480 midQ
->midState
= MID_REQUEST_SUBMITTED
;
481 rc
= smb_send(ses
->server
->ssocket
, in_buf
, in_buf
->smb_buf_length
,
482 (struct sockaddr
*) &(ses
->server
->addr
.sockAddr
));
484 DeleteMidQEntry(midQ
);
485 up(&ses
->server
->tcpSem
);
486 /* If not lock req, update # of requests on wire to server */
488 atomic_dec(&ses
->server
->inFlight
);
489 wake_up(&ses
->server
->request_q
);
493 up(&ses
->server
->tcpSem
);
495 goto cifs_no_response_exit
;
496 else if (long_op
== 2) /* writes past end of file can take looooong time */
498 else if (long_op
== 1)
499 timeout
= 45 * HZ
; /* should be greater than
500 servers oplock break timeout (about 43 seconds) */
501 else if (long_op
> 2) {
502 timeout
= MAX_SCHEDULE_TIMEOUT
;
505 /* wait for 15 seconds or until woken up due to response arriving or
506 due to last connection to this server being unmounted */
507 if (signal_pending(current
)) {
508 /* if signal pending do not hold up user for full smb timeout
509 but we still give response a change to complete */
513 /* No user interrupts in wait - wreaks havoc with performance */
514 if(timeout
!= MAX_SCHEDULE_TIMEOUT
) {
516 wait_event(ses
->server
->response_q
,
517 (!(midQ
->midState
& MID_REQUEST_SUBMITTED
)) ||
518 time_after(jiffies
, timeout
) ||
519 ((ses
->server
->tcpStatus
!= CifsGood
) &&
520 (ses
->server
->tcpStatus
!= CifsNew
)));
522 wait_event(ses
->server
->response_q
,
523 (!(midQ
->midState
& MID_REQUEST_SUBMITTED
)) ||
524 ((ses
->server
->tcpStatus
!= CifsGood
) &&
525 (ses
->server
->tcpStatus
!= CifsNew
)));
528 spin_lock(&GlobalMid_Lock
);
529 if (midQ
->resp_buf
) {
530 spin_unlock(&GlobalMid_Lock
);
531 receive_len
= be32_to_cpu(*(__be32
*)midQ
->resp_buf
);
533 cERROR(1,("No response buffer"));
534 if(midQ
->midState
== MID_REQUEST_SUBMITTED
) {
535 if(ses
->server
->tcpStatus
== CifsExiting
)
538 ses
->server
->tcpStatus
= CifsNeedReconnect
;
539 midQ
->midState
= MID_RETRY_NEEDED
;
543 if (rc
!= -EHOSTDOWN
) {
544 if(midQ
->midState
== MID_RETRY_NEEDED
) {
546 cFYI(1,("marking request for retry"));
551 spin_unlock(&GlobalMid_Lock
);
552 DeleteMidQEntry(midQ
);
553 /* If not lock req, update # of requests on wire to server */
555 atomic_dec(&ses
->server
->inFlight
);
556 wake_up(&ses
->server
->request_q
);
561 if (receive_len
> CIFSMaxBufSize
+ MAX_CIFS_HDR_SIZE
) {
562 cERROR(1, ("Frame too large received. Length: %d Xid: %d",
565 } else { /* rcvd frame is ok */
567 if (midQ
->resp_buf
&& out_buf
568 && (midQ
->midState
== MID_RESPONSE_RECEIVED
)) {
569 out_buf
->smb_buf_length
= receive_len
;
570 memcpy((char *)out_buf
+ 4,
571 (char *)midQ
->resp_buf
+ 4,
574 dump_smb(out_buf
, 92);
575 /* convert the length into a more usable form */
576 if((receive_len
> 24) &&
577 (ses
->server
->secMode
& (SECMODE_SIGN_REQUIRED
|
578 SECMODE_SIGN_ENABLED
))) {
579 rc
= cifs_verify_signature(out_buf
,
580 ses
->server
->mac_signing_key
,
581 midQ
->sequence_number
+1);
583 cERROR(1,("Unexpected packet signature received from server"));
584 /* BB FIXME - add code to kill session here */
588 *pbytes_returned
= out_buf
->smb_buf_length
;
590 /* BB special case reconnect tid and uid here? */
591 rc
= map_smb_to_linux_error(out_buf
);
593 /* convert ByteCount if necessary */
595 sizeof (struct smb_hdr
) -
596 4 /* do not count RFC1001 header */ +
597 (2 * out_buf
->WordCount
) + 2 /* bcc */ )
598 BCC(out_buf
) = le16_to_cpu(BCC(out_buf
));
601 cFYI(1,("Bad MID state? "));
604 cifs_no_response_exit
:
605 DeleteMidQEntry(midQ
);
608 atomic_dec(&ses
->server
->inFlight
);
609 wake_up(&ses
->server
->request_q
);
615 up(&ses
->server
->tcpSem
);
616 /* If not lock req, update # of requests on wire to server */
618 atomic_dec(&ses
->server
->inFlight
);
619 wake_up(&ses
->server
->request_q
);