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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2002,2004 | |
5 | * Author(s): Steve French (sfrench@us.ibm.com) | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #include <linux/fs.h> | |
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> | |
30 | #include "cifspdu.h" | |
31 | #include "cifsglob.h" | |
32 | #include "cifsproto.h" | |
33 | #include "cifs_debug.h" | |
34 | ||
35 | extern mempool_t *cifs_mid_poolp; | |
36 | extern kmem_cache_t *cifs_oplock_cachep; | |
37 | ||
38 | static struct mid_q_entry * | |
39 | AllocMidQEntry(struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) | |
40 | { | |
41 | struct mid_q_entry *temp; | |
42 | ||
43 | if (ses == NULL) { | |
44 | cERROR(1, ("Null session passed in to AllocMidQEntry ")); | |
45 | return NULL; | |
46 | } | |
47 | if (ses->server == NULL) { | |
48 | cERROR(1, ("Null TCP session in AllocMidQEntry")); | |
49 | return NULL; | |
50 | } | |
51 | ||
52 | temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp,SLAB_KERNEL | SLAB_NOFS); | |
53 | if (temp == NULL) | |
54 | return temp; | |
55 | else { | |
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); | |
62 | temp->ses = ses; | |
63 | temp->tsk = current; | |
64 | } | |
65 | ||
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); | |
71 | return temp; | |
72 | } | |
73 | ||
74 | static void | |
75 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
76 | { | |
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); | |
84 | } | |
85 | ||
86 | struct oplock_q_entry * | |
87 | AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon) | |
88 | { | |
89 | struct oplock_q_entry *temp; | |
90 | if ((pinode== NULL) || (tcon == NULL)) { | |
91 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); | |
92 | return NULL; | |
93 | } | |
94 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, | |
95 | SLAB_KERNEL); | |
96 | if (temp == NULL) | |
97 | return temp; | |
98 | else { | |
99 | temp->pinode = pinode; | |
100 | temp->tcon = tcon; | |
101 | temp->netfid = fid; | |
102 | spin_lock(&GlobalMid_Lock); | |
103 | list_add_tail(&temp->qhead, &GlobalOplock_Q); | |
104 | spin_unlock(&GlobalMid_Lock); | |
105 | } | |
106 | return temp; | |
107 | ||
108 | } | |
109 | ||
110 | void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry) | |
111 | { | |
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); | |
117 | } | |
118 | ||
119 | int | |
120 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
121 | unsigned int smb_buf_length, struct sockaddr *sin) | |
122 | { | |
123 | int rc = 0; | |
124 | int i = 0; | |
125 | struct msghdr smb_msg; | |
126 | struct kvec iov; | |
127 | unsigned len = smb_buf_length + 4; | |
128 | ||
129 | if(ssocket == NULL) | |
130 | return -ENOTSOCK; /* BB eventually add reconnect code here */ | |
131 | iov.iov_base = smb_buffer; | |
132 | iov.iov_len = len; | |
133 | ||
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?*/ | |
139 | ||
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 */ | |
144 | ||
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); | |
148 | ||
149 | while (len > 0) { | |
150 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
151 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
152 | i++; | |
153 | if(i > 60) { | |
154 | cERROR(1, | |
155 | ("sends on sock %p stuck for 30 seconds", | |
156 | ssocket)); | |
157 | rc = -EAGAIN; | |
158 | break; | |
159 | } | |
160 | msleep(500); | |
161 | continue; | |
162 | } | |
163 | if (rc < 0) | |
164 | break; | |
165 | iov.iov_base += rc; | |
166 | iov.iov_len -= rc; | |
167 | len -= rc; | |
168 | } | |
169 | ||
170 | if (rc < 0) { | |
171 | cERROR(1,("Error %d sending data on socket to server.", rc)); | |
172 | } else { | |
173 | rc = 0; | |
174 | } | |
175 | ||
176 | return rc; | |
177 | } | |
178 | ||
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 */ | |
182 | ||
183 | int | |
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) | |
186 | { | |
187 | int rc = 0; | |
188 | int i = 0; | |
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; | |
194 | ||
195 | if(ssocket == NULL) | |
196 | return -ENOTSOCK; /* BB eventually add reconnect code here */ | |
197 | iov.iov_base = smb_buffer; | |
198 | iov.iov_len = len; | |
199 | ||
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?*/ | |
205 | ||
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 */ | |
210 | ||
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); | |
214 | ||
215 | while (len > 0) { | |
216 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, number_of_pages, len?); | |
217 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
218 | i++; | |
219 | if(i > 60) { | |
220 | cERROR(1, | |
221 | ("sends on sock %p stuck for 30 seconds", | |
222 | ssocket)); | |
223 | rc = -EAGAIN; | |
224 | break; | |
225 | } | |
226 | msleep(500); | |
227 | continue; | |
228 | } | |
229 | if (rc < 0) | |
230 | break; | |
231 | iov.iov_base += rc; | |
232 | iov.iov_len -= rc; | |
233 | len -= rc; | |
234 | } | |
235 | ||
236 | if (rc < 0) { | |
237 | cERROR(1,("Error %d sending data on socket to server.", rc)); | |
238 | } else { | |
239 | rc = 0; | |
240 | } | |
241 | ||
242 | return rc; | |
243 | } | |
244 | ||
245 | ||
246 | int | |
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) | |
249 | { | |
250 | int rc = 0; | |
251 | unsigned long timeout = 15 * HZ; | |
252 | struct mid_q_entry *midQ = NULL; | |
253 | ||
254 | if (ses == NULL) { | |
255 | cERROR(1,("Null smb session")); | |
256 | return -EIO; | |
257 | } | |
258 | if(ses->server == NULL) { | |
259 | cERROR(1,("Null tcp session")); | |
260 | return -EIO; | |
261 | } | |
262 | if(pbytes_returned == NULL) | |
263 | return -EIO; | |
264 | else | |
265 | *pbytes_returned = 0; | |
266 | ||
267 | ||
268 | ||
269 | /* Ensure that we do not send more than 50 overlapping requests | |
270 | to the same server. We may make this configurable later or | |
271 | use ses->maxReq */ | |
272 | if(long_op == -1) { | |
273 | /* oplock breaks must not be held up */ | |
274 | atomic_inc(&ses->server->inFlight); | |
275 | } else { | |
276 | spin_lock(&GlobalMid_Lock); | |
277 | while(1) { | |
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) | |
282 | < cifs_max_pending); | |
283 | spin_lock(&GlobalMid_Lock); | |
284 | } else { | |
285 | if(ses->server->tcpStatus == CifsExiting) { | |
286 | spin_unlock(&GlobalMid_Lock); | |
287 | return -ENOENT; | |
288 | } | |
289 | ||
290 | /* can not count locking commands against total since | |
291 | they are allowed to block on server */ | |
292 | ||
293 | if(long_op < 3) { | |
294 | /* update # of requests on the wire to server */ | |
295 | atomic_inc(&ses->server->inFlight); | |
296 | } | |
297 | spin_unlock(&GlobalMid_Lock); | |
298 | break; | |
299 | } | |
300 | } | |
301 | } | |
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 | |
304 | of smb data */ | |
305 | ||
306 | down(&ses->server->tcpSem); | |
307 | ||
308 | if (ses->server->tcpStatus == CifsExiting) { | |
309 | rc = -ENOENT; | |
310 | goto cifs_out_label; | |
311 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { | |
312 | cFYI(1,("tcp session dead - return to caller to retry")); | |
313 | rc = -EAGAIN; | |
314 | goto cifs_out_label; | |
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)) { | |
319 | rc = -EAGAIN; | |
320 | goto cifs_out_label; | |
321 | } /* else ok - we are setting up session */ | |
322 | } | |
323 | midQ = AllocMidQEntry(in_buf, ses); | |
324 | if (midQ == NULL) { | |
325 | up(&ses->server->tcpSem); | |
326 | /* If not lock req, update # of requests on wire to server */ | |
327 | if(long_op < 3) { | |
328 | atomic_dec(&ses->server->inFlight); | |
329 | wake_up(&ses->server->request_q); | |
330 | } | |
331 | return -ENOMEM; | |
332 | } | |
333 | ||
334 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
335 | up(&ses->server->tcpSem); | |
336 | cERROR(1, | |
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 */ | |
341 | if(long_op < 3) { | |
342 | atomic_dec(&ses->server->inFlight); | |
343 | wake_up(&ses->server->request_q); | |
344 | } | |
345 | return -EIO; | |
346 | } | |
347 | ||
348 | /* BB can we sign efficiently in this path? */ | |
349 | rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number); | |
350 | ||
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));*/ | |
354 | if(rc < 0) { | |
355 | DeleteMidQEntry(midQ); | |
356 | up(&ses->server->tcpSem); | |
357 | /* If not lock req, update # of requests on wire to server */ | |
358 | if(long_op < 3) { | |
359 | atomic_dec(&ses->server->inFlight); | |
360 | wake_up(&ses->server->request_q); | |
361 | } | |
362 | return rc; | |
363 | } else | |
364 | up(&ses->server->tcpSem); | |
365 | cifs_out_label: | |
366 | if(midQ) | |
367 | DeleteMidQEntry(midQ); | |
368 | ||
369 | if(long_op < 3) { | |
370 | atomic_dec(&ses->server->inFlight); | |
371 | wake_up(&ses->server->request_q); | |
372 | } | |
373 | ||
374 | return rc; | |
375 | } | |
376 | ||
377 | ||
378 | #endif /* CIFS_EXPERIMENTAL */ | |
379 | ||
380 | int | |
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) | |
384 | { | |
385 | int rc = 0; | |
386 | unsigned int receive_len; | |
387 | unsigned long timeout; | |
388 | struct mid_q_entry *midQ; | |
389 | ||
390 | if (ses == NULL) { | |
391 | cERROR(1,("Null smb session")); | |
392 | return -EIO; | |
393 | } | |
394 | if(ses->server == NULL) { | |
395 | cERROR(1,("Null tcp session")); | |
396 | return -EIO; | |
397 | } | |
398 | ||
399 | /* Ensure that we do not send more than 50 overlapping requests | |
400 | to the same server. We may make this configurable later or | |
401 | use ses->maxReq */ | |
402 | if(long_op == -1) { | |
403 | /* oplock breaks must not be held up */ | |
404 | atomic_inc(&ses->server->inFlight); | |
405 | } else { | |
406 | spin_lock(&GlobalMid_Lock); | |
407 | while(1) { | |
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) | |
412 | < cifs_max_pending); | |
413 | spin_lock(&GlobalMid_Lock); | |
414 | } else { | |
415 | if(ses->server->tcpStatus == CifsExiting) { | |
416 | spin_unlock(&GlobalMid_Lock); | |
417 | return -ENOENT; | |
418 | } | |
419 | ||
420 | /* can not count locking commands against total since | |
421 | they are allowed to block on server */ | |
422 | ||
423 | if(long_op < 3) { | |
424 | /* update # of requests on the wire to server */ | |
425 | atomic_inc(&ses->server->inFlight); | |
426 | } | |
427 | spin_unlock(&GlobalMid_Lock); | |
428 | break; | |
429 | } | |
430 | } | |
431 | } | |
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 | |
434 | of smb data */ | |
435 | ||
436 | down(&ses->server->tcpSem); | |
437 | ||
438 | if (ses->server->tcpStatus == CifsExiting) { | |
439 | rc = -ENOENT; | |
440 | goto out_unlock; | |
441 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { | |
442 | cFYI(1,("tcp session dead - return to caller to retry")); | |
443 | rc = -EAGAIN; | |
444 | goto out_unlock; | |
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)) { | |
449 | rc = -EAGAIN; | |
450 | goto out_unlock; | |
451 | } /* else ok - we are setting up session */ | |
452 | } | |
453 | midQ = AllocMidQEntry(in_buf, ses); | |
454 | if (midQ == NULL) { | |
455 | up(&ses->server->tcpSem); | |
456 | /* If not lock req, update # of requests on wire to server */ | |
457 | if(long_op < 3) { | |
458 | atomic_dec(&ses->server->inFlight); | |
459 | wake_up(&ses->server->request_q); | |
460 | } | |
461 | return -ENOMEM; | |
462 | } | |
463 | ||
464 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
465 | up(&ses->server->tcpSem); | |
466 | cERROR(1, | |
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 */ | |
471 | if(long_op < 3) { | |
472 | atomic_dec(&ses->server->inFlight); | |
473 | wake_up(&ses->server->request_q); | |
474 | } | |
475 | return -EIO; | |
476 | } | |
477 | ||
478 | rc = cifs_sign_smb(in_buf, ses, &midQ->sequence_number); | |
479 | ||
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)); | |
483 | if(rc < 0) { | |
484 | DeleteMidQEntry(midQ); | |
485 | up(&ses->server->tcpSem); | |
486 | /* If not lock req, update # of requests on wire to server */ | |
487 | if(long_op < 3) { | |
488 | atomic_dec(&ses->server->inFlight); | |
489 | wake_up(&ses->server->request_q); | |
490 | } | |
491 | return rc; | |
492 | } else | |
493 | up(&ses->server->tcpSem); | |
494 | if (long_op == -1) | |
495 | goto cifs_no_response_exit; | |
496 | else if (long_op == 2) /* writes past end of file can take looooong time */ | |
497 | timeout = 300 * HZ; | |
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; | |
503 | } else | |
504 | timeout = 15 * HZ; | |
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 */ | |
510 | timeout = 2 * HZ; | |
511 | } | |
512 | ||
513 | /* No user interrupts in wait - wreaks havoc with performance */ | |
514 | if(timeout != MAX_SCHEDULE_TIMEOUT) { | |
515 | timeout += jiffies; | |
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))); | |
521 | } else { | |
522 | wait_event(ses->server->response_q, | |
523 | (!(midQ->midState & MID_REQUEST_SUBMITTED)) || | |
524 | ((ses->server->tcpStatus != CifsGood) && | |
525 | (ses->server->tcpStatus != CifsNew))); | |
526 | } | |
527 | ||
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); | |
532 | } else { | |
533 | cERROR(1,("No response buffer")); | |
534 | if(midQ->midState == MID_REQUEST_SUBMITTED) { | |
535 | if(ses->server->tcpStatus == CifsExiting) | |
536 | rc = -EHOSTDOWN; | |
537 | else { | |
538 | ses->server->tcpStatus = CifsNeedReconnect; | |
539 | midQ->midState = MID_RETRY_NEEDED; | |
540 | } | |
541 | } | |
542 | ||
543 | if (rc != -EHOSTDOWN) { | |
544 | if(midQ->midState == MID_RETRY_NEEDED) { | |
545 | rc = -EAGAIN; | |
546 | cFYI(1,("marking request for retry")); | |
547 | } else { | |
548 | rc = -EIO; | |
549 | } | |
550 | } | |
551 | spin_unlock(&GlobalMid_Lock); | |
552 | DeleteMidQEntry(midQ); | |
553 | /* If not lock req, update # of requests on wire to server */ | |
554 | if(long_op < 3) { | |
555 | atomic_dec(&ses->server->inFlight); | |
556 | wake_up(&ses->server->request_q); | |
557 | } | |
558 | return rc; | |
559 | } | |
560 | ||
561 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { | |
562 | cERROR(1, | |
563 | ("Frame too large received. Length: %d Xid: %d", | |
564 | receive_len, xid)); | |
565 | rc = -EIO; | |
566 | } else { /* rcvd frame is ok */ | |
567 | ||
568 | if (midQ->resp_buf && out_buf | |
569 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
570 | out_buf->smb_buf_length = receive_len; | |
571 | memcpy((char *)out_buf + 4, | |
572 | (char *)midQ->resp_buf + 4, | |
573 | receive_len); | |
574 | ||
575 | dump_smb(out_buf, 92); | |
576 | /* convert the length into a more usable form */ | |
577 | if((receive_len > 24) && | |
578 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))) { | |
579 | rc = cifs_verify_signature(out_buf, ses->mac_signing_key,midQ->sequence_number); /* BB fix BB */ | |
580 | if(rc) | |
581 | cFYI(1,("Unexpected signature received from server")); | |
582 | } | |
583 | ||
584 | *pbytes_returned = out_buf->smb_buf_length; | |
585 | ||
586 | /* BB special case reconnect tid and reconnect uid here? */ | |
587 | rc = map_smb_to_linux_error(out_buf); | |
588 | ||
589 | /* convert ByteCount if necessary */ | |
590 | if (receive_len >= | |
591 | sizeof (struct smb_hdr) - | |
592 | 4 /* do not count RFC1001 header */ + | |
593 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
594 | BCC(out_buf) = le16_to_cpu(BCC(out_buf)); | |
595 | } else { | |
596 | rc = -EIO; | |
597 | cFYI(1,("Bad MID state? ")); | |
598 | } | |
599 | } | |
600 | cifs_no_response_exit: | |
601 | DeleteMidQEntry(midQ); | |
602 | ||
603 | if(long_op < 3) { | |
604 | atomic_dec(&ses->server->inFlight); | |
605 | wake_up(&ses->server->request_q); | |
606 | } | |
607 | ||
608 | return rc; | |
609 | ||
610 | out_unlock: | |
611 | up(&ses->server->tcpSem); | |
612 | /* If not lock req, update # of requests on wire to server */ | |
613 | if(long_op < 3) { | |
614 | atomic_dec(&ses->server->inFlight); | |
615 | wake_up(&ses->server->request_q); | |
616 | } | |
617 | ||
618 | return rc; | |
619 | } |