Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
b8643e1b | 4 | * Copyright (C) International Business Machines Corp., 2002,2005 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 SF |
6 | * Jeremy Allison (jra@samba.org) 2006. |
7 | * | |
1da177e4 LT |
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. | |
12 | * | |
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. | |
17 | * | |
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 | |
21 | */ | |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/delay.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/processor.h> | |
30 | #include <linux/mempool.h> | |
31 | #include "cifspdu.h" | |
32 | #include "cifsglob.h" | |
33 | #include "cifsproto.h" | |
34 | #include "cifs_debug.h" | |
35 | ||
36 | extern mempool_t *cifs_mid_poolp; | |
e18b890b | 37 | extern struct kmem_cache *cifs_oplock_cachep; |
1da177e4 LT |
38 | |
39 | static struct mid_q_entry * | |
7ee1af76 | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
44 | if (ses == NULL) { | |
275cde1a | 45 | cERROR(1, ("Null session passed in to AllocMidQEntry")); |
1da177e4 LT |
46 | return NULL; |
47 | } | |
48 | if (ses->server == NULL) { | |
49 | cERROR(1, ("Null TCP session in AllocMidQEntry")); | |
50 | return NULL; | |
51 | } | |
52 | ||
d6e04ae6 | 53 | temp = (struct mid_q_entry *) mempool_alloc(cifs_mid_poolp, |
e94b1766 | 54 | GFP_KERNEL | GFP_NOFS); |
1da177e4 LT |
55 | if (temp == NULL) |
56 | return temp; | |
57 | else { | |
58 | memset(temp, 0, sizeof (struct mid_q_entry)); | |
59 | temp->mid = smb_buffer->Mid; /* always LE */ | |
60 | temp->pid = current->pid; | |
61 | temp->command = smb_buffer->Command; | |
62 | cFYI(1, ("For smb_command %d", temp->command)); | |
1047abc1 SF |
63 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
64 | /* when mid allocated can be before when sent */ | |
65 | temp->when_alloc = jiffies; | |
1da177e4 LT |
66 | temp->ses = ses; |
67 | temp->tsk = current; | |
68 | } | |
69 | ||
70 | spin_lock(&GlobalMid_Lock); | |
71 | list_add_tail(&temp->qhead, &ses->server->pending_mid_q); | |
72 | atomic_inc(&midCount); | |
73 | temp->midState = MID_REQUEST_ALLOCATED; | |
74 | spin_unlock(&GlobalMid_Lock); | |
75 | return temp; | |
76 | } | |
77 | ||
78 | static void | |
79 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
80 | { | |
1047abc1 SF |
81 | #ifdef CONFIG_CIFS_STATS2 |
82 | unsigned long now; | |
83 | #endif | |
1da177e4 LT |
84 | spin_lock(&GlobalMid_Lock); |
85 | midEntry->midState = MID_FREE; | |
86 | list_del(&midEntry->qhead); | |
87 | atomic_dec(&midCount); | |
88 | spin_unlock(&GlobalMid_Lock); | |
b8643e1b SF |
89 | if(midEntry->largeBuf) |
90 | cifs_buf_release(midEntry->resp_buf); | |
91 | else | |
92 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
93 | #ifdef CONFIG_CIFS_STATS2 |
94 | now = jiffies; | |
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); | |
106 | } | |
107 | } | |
108 | #endif | |
1da177e4 LT |
109 | mempool_free(midEntry, cifs_mid_poolp); |
110 | } | |
111 | ||
112 | struct oplock_q_entry * | |
113 | AllocOplockQEntry(struct inode * pinode, __u16 fid, struct cifsTconInfo * tcon) | |
114 | { | |
115 | struct oplock_q_entry *temp; | |
116 | if ((pinode== NULL) || (tcon == NULL)) { | |
117 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); | |
118 | return NULL; | |
119 | } | |
120 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, | |
e94b1766 | 121 | GFP_KERNEL); |
1da177e4 LT |
122 | if (temp == NULL) |
123 | return temp; | |
124 | else { | |
125 | temp->pinode = pinode; | |
126 | temp->tcon = tcon; | |
127 | temp->netfid = fid; | |
128 | spin_lock(&GlobalMid_Lock); | |
129 | list_add_tail(&temp->qhead, &GlobalOplock_Q); | |
130 | spin_unlock(&GlobalMid_Lock); | |
131 | } | |
132 | return temp; | |
133 | ||
134 | } | |
135 | ||
136 | void DeleteOplockQEntry(struct oplock_q_entry * oplockEntry) | |
137 | { | |
138 | spin_lock(&GlobalMid_Lock); | |
139 | /* should we check if list empty first? */ | |
140 | list_del(&oplockEntry->qhead); | |
141 | spin_unlock(&GlobalMid_Lock); | |
142 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); | |
143 | } | |
144 | ||
145 | int | |
146 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
147 | unsigned int smb_buf_length, struct sockaddr *sin) | |
148 | { | |
149 | int rc = 0; | |
150 | int i = 0; | |
151 | struct msghdr smb_msg; | |
152 | struct kvec iov; | |
153 | unsigned len = smb_buf_length + 4; | |
154 | ||
155 | if(ssocket == NULL) | |
156 | return -ENOTSOCK; /* BB eventually add reconnect code here */ | |
157 | iov.iov_base = smb_buffer; | |
158 | iov.iov_len = len; | |
159 | ||
160 | smb_msg.msg_name = sin; | |
161 | smb_msg.msg_namelen = sizeof (struct sockaddr); | |
162 | smb_msg.msg_control = NULL; | |
163 | smb_msg.msg_controllen = 0; | |
164 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ | |
165 | ||
166 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
167 | area, and byte area if necessary, is converted to littleendian in | |
168 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
169 | Flags2 is converted in SendReceive */ | |
170 | ||
171 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); | |
3e84469d | 172 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
1da177e4 LT |
173 | dump_smb(smb_buffer, len); |
174 | ||
175 | while (len > 0) { | |
176 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
177 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
178 | i++; | |
3e84469d SF |
179 | /* smaller timeout here than send2 since smaller size */ |
180 | /* Although it may not be required, this also is smaller | |
181 | oplock break time */ | |
68058e75 | 182 | if(i > 12) { |
1da177e4 | 183 | cERROR(1, |
68058e75 | 184 | ("sends on sock %p stuck for 7 seconds", |
1da177e4 LT |
185 | ssocket)); |
186 | rc = -EAGAIN; | |
187 | break; | |
188 | } | |
68058e75 | 189 | msleep(1 << i); |
1da177e4 LT |
190 | continue; |
191 | } | |
192 | if (rc < 0) | |
193 | break; | |
5e1253b5 SF |
194 | else |
195 | i = 0; /* reset i after each successful send */ | |
1da177e4 LT |
196 | iov.iov_base += rc; |
197 | iov.iov_len -= rc; | |
198 | len -= rc; | |
199 | } | |
200 | ||
201 | if (rc < 0) { | |
3e84469d | 202 | cERROR(1,("Error %d sending data on socket to server", rc)); |
1da177e4 LT |
203 | } else { |
204 | rc = 0; | |
205 | } | |
206 | ||
7ee1af76 JA |
207 | /* Don't want to modify the buffer as a |
208 | side effect of this call. */ | |
209 | smb_buffer->smb_buf_length = smb_buf_length; | |
210 | ||
1da177e4 LT |
211 | return rc; |
212 | } | |
213 | ||
d6e04ae6 | 214 | static int |
3e84469d SF |
215 | smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec, |
216 | struct sockaddr *sin) | |
1da177e4 LT |
217 | { |
218 | int rc = 0; | |
219 | int i = 0; | |
220 | struct msghdr smb_msg; | |
3e84469d SF |
221 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
222 | unsigned int len = iov[0].iov_len; | |
223 | unsigned int total_len; | |
224 | int first_vec = 0; | |
7ee1af76 | 225 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
d6e04ae6 | 226 | |
1da177e4 LT |
227 | if(ssocket == NULL) |
228 | return -ENOTSOCK; /* BB eventually add reconnect code here */ | |
3e84469d | 229 | |
1da177e4 LT |
230 | smb_msg.msg_name = sin; |
231 | smb_msg.msg_namelen = sizeof (struct sockaddr); | |
232 | smb_msg.msg_control = NULL; | |
233 | smb_msg.msg_controllen = 0; | |
234 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ | |
235 | ||
236 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
237 | area, and byte area if necessary, is converted to littleendian in | |
238 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
239 | Flags2 is converted in SendReceive */ | |
240 | ||
3e84469d SF |
241 | |
242 | total_len = 0; | |
243 | for (i = 0; i < n_vec; i++) | |
244 | total_len += iov[i].iov_len; | |
245 | ||
1da177e4 | 246 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 247 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
248 | dump_smb(smb_buffer, len); |
249 | ||
3e84469d SF |
250 | while (total_len) { |
251 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
252 | n_vec - first_vec, total_len); | |
1da177e4 LT |
253 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
254 | i++; | |
68058e75 | 255 | if(i >= 14) { |
1da177e4 | 256 | cERROR(1, |
68058e75 | 257 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
258 | ssocket)); |
259 | rc = -EAGAIN; | |
260 | break; | |
261 | } | |
68058e75 | 262 | msleep(1 << i); |
1da177e4 LT |
263 | continue; |
264 | } | |
265 | if (rc < 0) | |
266 | break; | |
3e84469d SF |
267 | |
268 | if (rc >= total_len) { | |
269 | WARN_ON(rc > total_len); | |
270 | break; | |
271 | } | |
272 | if(rc == 0) { | |
273 | /* should never happen, letting socket clear before | |
274 | retrying is our only obvious option here */ | |
04c08816 | 275 | cERROR(1,("tcp sent no data")); |
3e84469d SF |
276 | msleep(500); |
277 | continue; | |
d6e04ae6 | 278 | } |
3e84469d | 279 | total_len -= rc; |
68058e75 | 280 | /* the line below resets i */ |
3e84469d SF |
281 | for (i = first_vec; i < n_vec; i++) { |
282 | if (iov[i].iov_len) { | |
283 | if (rc > iov[i].iov_len) { | |
284 | rc -= iov[i].iov_len; | |
285 | iov[i].iov_len = 0; | |
286 | } else { | |
287 | iov[i].iov_base += rc; | |
288 | iov[i].iov_len -= rc; | |
289 | first_vec = i; | |
290 | break; | |
291 | } | |
292 | } | |
d6e04ae6 | 293 | } |
5e1253b5 | 294 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
295 | } |
296 | ||
297 | if (rc < 0) { | |
3e84469d SF |
298 | cERROR(1,("Error %d sending data on socket to server", rc)); |
299 | } else | |
1da177e4 | 300 | rc = 0; |
1da177e4 | 301 | |
7ee1af76 JA |
302 | /* Don't want to modify the buffer as a |
303 | side effect of this call. */ | |
304 | smb_buffer->smb_buf_length = smb_buf_length; | |
305 | ||
1da177e4 LT |
306 | return rc; |
307 | } | |
308 | ||
7ee1af76 | 309 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 310 | { |
1da177e4 LT |
311 | if(long_op == -1) { |
312 | /* oplock breaks must not be held up */ | |
313 | atomic_inc(&ses->server->inFlight); | |
314 | } else { | |
315 | spin_lock(&GlobalMid_Lock); | |
316 | while(1) { | |
d6e04ae6 SF |
317 | if(atomic_read(&ses->server->inFlight) >= |
318 | cifs_max_pending){ | |
1da177e4 | 319 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
320 | #ifdef CONFIG_CIFS_STATS2 |
321 | atomic_inc(&ses->server->num_waiters); | |
322 | #endif | |
1da177e4 LT |
323 | wait_event(ses->server->request_q, |
324 | atomic_read(&ses->server->inFlight) | |
325 | < cifs_max_pending); | |
131afd0b SF |
326 | #ifdef CONFIG_CIFS_STATS2 |
327 | atomic_dec(&ses->server->num_waiters); | |
328 | #endif | |
1da177e4 LT |
329 | spin_lock(&GlobalMid_Lock); |
330 | } else { | |
331 | if(ses->server->tcpStatus == CifsExiting) { | |
332 | spin_unlock(&GlobalMid_Lock); | |
333 | return -ENOENT; | |
334 | } | |
335 | ||
7ee1af76 JA |
336 | /* can not count locking commands against total since |
337 | they are allowed to block on server */ | |
1da177e4 | 338 | |
1da177e4 | 339 | /* update # of requests on the wire to server */ |
7ee1af76 | 340 | if (long_op < 3) |
1da177e4 | 341 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
342 | spin_unlock(&GlobalMid_Lock); |
343 | break; | |
344 | } | |
345 | } | |
346 | } | |
7ee1af76 JA |
347 | return 0; |
348 | } | |
1da177e4 | 349 | |
7ee1af76 JA |
350 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
351 | struct mid_q_entry **ppmidQ) | |
352 | { | |
1da177e4 | 353 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 354 | return -ENOENT; |
1da177e4 LT |
355 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
356 | cFYI(1,("tcp session dead - return to caller to retry")); | |
7ee1af76 | 357 | return -EAGAIN; |
1da177e4 LT |
358 | } else if (ses->status != CifsGood) { |
359 | /* check if SMB session is bad because we are setting it up */ | |
360 | if((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && | |
361 | (in_buf->Command != SMB_COM_NEGOTIATE)) { | |
7ee1af76 | 362 | return -EAGAIN; |
1da177e4 LT |
363 | } /* else ok - we are setting up session */ |
364 | } | |
7ee1af76 JA |
365 | *ppmidQ = AllocMidQEntry(in_buf, ses); |
366 | if (*ppmidQ == NULL) { | |
367 | return -ENOMEM; | |
368 | } | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static int wait_for_response(struct cifsSesInfo *ses, | |
373 | struct mid_q_entry *midQ, | |
374 | unsigned long timeout, | |
375 | unsigned long time_to_wait) | |
376 | { | |
377 | unsigned long curr_timeout; | |
378 | ||
379 | for (;;) { | |
380 | curr_timeout = timeout + jiffies; | |
381 | wait_event(ses->server->response_q, | |
382 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || | |
383 | time_after(jiffies, curr_timeout) || | |
384 | ((ses->server->tcpStatus != CifsGood) && | |
385 | (ses->server->tcpStatus != CifsNew))); | |
386 | ||
387 | if (time_after(jiffies, curr_timeout) && | |
388 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
389 | ((ses->server->tcpStatus == CifsGood) || | |
390 | (ses->server->tcpStatus == CifsNew))) { | |
391 | ||
392 | unsigned long lrt; | |
393 | ||
394 | /* We timed out. Is the server still | |
395 | sending replies ? */ | |
396 | spin_lock(&GlobalMid_Lock); | |
397 | lrt = ses->server->lstrp; | |
398 | spin_unlock(&GlobalMid_Lock); | |
399 | ||
400 | /* Calculate time_to_wait past last receive time. | |
401 | Although we prefer not to time out if the | |
402 | server is still responding - we will time | |
403 | out if the server takes more than 15 (or 45 | |
404 | or 180) seconds to respond to this request | |
405 | and has not responded to any request from | |
406 | other threads on the client within 10 seconds */ | |
407 | lrt += time_to_wait; | |
408 | if (time_after(jiffies, lrt)) { | |
409 | /* No replies for time_to_wait. */ | |
410 | cERROR(1,("server not responding")); | |
411 | return -1; | |
412 | } | |
413 | } else { | |
414 | return 0; | |
415 | } | |
416 | } | |
417 | } | |
418 | ||
419 | int | |
420 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, | |
421 | struct kvec *iov, int n_vec, int * pRespBufType /* ret */, | |
422 | const int long_op) | |
423 | { | |
424 | int rc = 0; | |
425 | unsigned int receive_len; | |
426 | unsigned long timeout; | |
427 | struct mid_q_entry *midQ; | |
428 | struct smb_hdr *in_buf = iov[0].iov_base; | |
429 | ||
430 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ | |
431 | ||
432 | if ((ses == NULL) || (ses->server == NULL)) { | |
433 | cifs_small_buf_release(in_buf); | |
434 | cERROR(1,("Null session")); | |
435 | return -EIO; | |
436 | } | |
437 | ||
438 | if(ses->server->tcpStatus == CifsExiting) { | |
439 | cifs_small_buf_release(in_buf); | |
440 | return -ENOENT; | |
441 | } | |
442 | ||
443 | /* Ensure that we do not send more than 50 overlapping requests | |
444 | to the same server. We may make this configurable later or | |
445 | use ses->maxReq */ | |
446 | ||
447 | rc = wait_for_free_request(ses, long_op); | |
448 | if (rc) { | |
449 | cifs_small_buf_release(in_buf); | |
450 | return rc; | |
451 | } | |
452 | ||
453 | /* make sure that we sign in the same order that we send on this socket | |
454 | and avoid races inside tcp sendmsg code that could cause corruption | |
455 | of smb data */ | |
456 | ||
457 | down(&ses->server->tcpSem); | |
458 | ||
459 | rc = allocate_mid(ses, in_buf, &midQ); | |
460 | if (rc) { | |
1da177e4 | 461 | up(&ses->server->tcpSem); |
4b8f930f | 462 | cifs_small_buf_release(in_buf); |
7ee1af76 JA |
463 | /* Update # of requests on wire to server */ |
464 | atomic_dec(&ses->server->inFlight); | |
465 | wake_up(&ses->server->request_q); | |
466 | return rc; | |
1da177e4 LT |
467 | } |
468 | ||
84afc29b | 469 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
470 | |
471 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
472 | #ifdef CONFIG_CIFS_STATS2 |
473 | atomic_inc(&ses->server->inSend); | |
474 | #endif | |
3e84469d | 475 | rc = smb_send2(ses->server->ssocket, iov, n_vec, |
d6e04ae6 | 476 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
131afd0b SF |
477 | #ifdef CONFIG_CIFS_STATS2 |
478 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 479 | midQ->when_sent = jiffies; |
131afd0b | 480 | #endif |
7ee1af76 JA |
481 | |
482 | up(&ses->server->tcpSem); | |
483 | cifs_small_buf_release(in_buf); | |
484 | ||
485 | if(rc < 0) | |
486 | goto out; | |
4b8f930f | 487 | |
d6e04ae6 | 488 | if (long_op == -1) |
7ee1af76 | 489 | goto out; |
d6e04ae6 | 490 | else if (long_op == 2) /* writes past end of file can take loong time */ |
37c0eb46 | 491 | timeout = 180 * HZ; |
d6e04ae6 SF |
492 | else if (long_op == 1) |
493 | timeout = 45 * HZ; /* should be greater than | |
494 | servers oplock break timeout (about 43 seconds) */ | |
7ee1af76 | 495 | else |
d6e04ae6 | 496 | timeout = 15 * HZ; |
7ee1af76 | 497 | |
d6e04ae6 SF |
498 | /* wait for 15 seconds or until woken up due to response arriving or |
499 | due to last connection to this server being unmounted */ | |
500 | if (signal_pending(current)) { | |
501 | /* if signal pending do not hold up user for full smb timeout | |
502 | but we still give response a change to complete */ | |
503 | timeout = 2 * HZ; | |
504 | } | |
505 | ||
506 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 507 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
508 | |
509 | spin_lock(&GlobalMid_Lock); | |
510 | if (midQ->resp_buf) { | |
511 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 512 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 513 | } else { |
37c0eb46 SF |
514 | cERROR(1,("No response to cmd %d mid %d", |
515 | midQ->command, midQ->mid)); | |
d6e04ae6 SF |
516 | if(midQ->midState == MID_REQUEST_SUBMITTED) { |
517 | if(ses->server->tcpStatus == CifsExiting) | |
518 | rc = -EHOSTDOWN; | |
519 | else { | |
520 | ses->server->tcpStatus = CifsNeedReconnect; | |
521 | midQ->midState = MID_RETRY_NEEDED; | |
522 | } | |
523 | } | |
524 | ||
525 | if (rc != -EHOSTDOWN) { | |
526 | if(midQ->midState == MID_RETRY_NEEDED) { | |
527 | rc = -EAGAIN; | |
528 | cFYI(1,("marking request for retry")); | |
529 | } else { | |
530 | rc = -EIO; | |
531 | } | |
532 | } | |
533 | spin_unlock(&GlobalMid_Lock); | |
534 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
535 | /* Update # of requests on wire to server */ |
536 | atomic_dec(&ses->server->inFlight); | |
537 | wake_up(&ses->server->request_q); | |
d6e04ae6 SF |
538 | return rc; |
539 | } | |
540 | ||
541 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { | |
542 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
543 | receive_len, xid)); | |
544 | rc = -EIO; | |
545 | } else { /* rcvd frame is ok */ | |
d6e04ae6 SF |
546 | if (midQ->resp_buf && |
547 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
84afc29b | 548 | |
ec637e3f SF |
549 | iov[0].iov_base = (char *)midQ->resp_buf; |
550 | if(midQ->largeBuf) | |
551 | *pRespBufType = CIFS_LARGE_BUFFER; | |
552 | else | |
553 | *pRespBufType = CIFS_SMALL_BUFFER; | |
554 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 555 | |
ec637e3f | 556 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 SF |
557 | /* convert the length into a more usable form */ |
558 | if((receive_len > 24) && | |
559 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
560 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 561 | rc = cifs_verify_signature(midQ->resp_buf, |
d6e04ae6 SF |
562 | ses->server->mac_signing_key, |
563 | midQ->sequence_number+1); | |
564 | if(rc) { | |
565 | cERROR(1,("Unexpected SMB signature")); | |
566 | /* BB FIXME add code to kill session */ | |
567 | } | |
568 | } | |
569 | ||
d6e04ae6 | 570 | /* BB special case reconnect tid and uid here? */ |
6ab16d24 | 571 | /* BB special case Errbadpassword and pwdexpired here */ |
ec637e3f | 572 | rc = map_smb_to_linux_error(midQ->resp_buf); |
d6e04ae6 SF |
573 | |
574 | /* convert ByteCount if necessary */ | |
575 | if (receive_len >= | |
576 | sizeof (struct smb_hdr) - | |
577 | 4 /* do not count RFC1001 header */ + | |
ec637e3f SF |
578 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
579 | BCC(midQ->resp_buf) = | |
580 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
581 | midQ->resp_buf = NULL; /* mark it so will not be freed | |
582 | by DeleteMidQEntry */ | |
d6e04ae6 SF |
583 | } else { |
584 | rc = -EIO; | |
ab2f218f | 585 | cFYI(1,("Bad MID state?")); |
d6e04ae6 SF |
586 | } |
587 | } | |
1da177e4 | 588 | |
7ee1af76 | 589 | out: |
1da177e4 | 590 | |
7ee1af76 JA |
591 | DeleteMidQEntry(midQ); |
592 | atomic_dec(&ses->server->inFlight); | |
593 | wake_up(&ses->server->request_q); | |
1da177e4 | 594 | |
d6e04ae6 SF |
595 | return rc; |
596 | } | |
1da177e4 LT |
597 | |
598 | int | |
599 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
600 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
601 | int *pbytes_returned, const int long_op) | |
602 | { | |
603 | int rc = 0; | |
604 | unsigned int receive_len; | |
605 | unsigned long timeout; | |
606 | struct mid_q_entry *midQ; | |
607 | ||
608 | if (ses == NULL) { | |
609 | cERROR(1,("Null smb session")); | |
610 | return -EIO; | |
611 | } | |
612 | if(ses->server == NULL) { | |
613 | cERROR(1,("Null tcp session")); | |
614 | return -EIO; | |
615 | } | |
616 | ||
31ca3bc3 SF |
617 | if(ses->server->tcpStatus == CifsExiting) |
618 | return -ENOENT; | |
619 | ||
1da177e4 LT |
620 | /* Ensure that we do not send more than 50 overlapping requests |
621 | to the same server. We may make this configurable later or | |
622 | use ses->maxReq */ | |
1da177e4 | 623 | |
7ee1af76 JA |
624 | rc = wait_for_free_request(ses, long_op); |
625 | if (rc) | |
626 | return rc; | |
627 | ||
1da177e4 LT |
628 | /* make sure that we sign in the same order that we send on this socket |
629 | and avoid races inside tcp sendmsg code that could cause corruption | |
630 | of smb data */ | |
631 | ||
632 | down(&ses->server->tcpSem); | |
633 | ||
7ee1af76 JA |
634 | rc = allocate_mid(ses, in_buf, &midQ); |
635 | if (rc) { | |
1da177e4 | 636 | up(&ses->server->tcpSem); |
7ee1af76 JA |
637 | /* Update # of requests on wire to server */ |
638 | atomic_dec(&ses->server->inFlight); | |
639 | wake_up(&ses->server->request_q); | |
640 | return rc; | |
1da177e4 LT |
641 | } |
642 | ||
643 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
26a21b98 | 644 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
1da177e4 LT |
645 | in_buf->smb_buf_length)); |
646 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
647 | up(&ses->server->tcpSem); |
648 | /* Update # of requests on wire to server */ | |
649 | atomic_dec(&ses->server->inFlight); | |
650 | wake_up(&ses->server->request_q); | |
1da177e4 LT |
651 | return -EIO; |
652 | } | |
653 | ||
ad009ac9 | 654 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
655 | |
656 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
657 | #ifdef CONFIG_CIFS_STATS2 |
658 | atomic_inc(&ses->server->inSend); | |
659 | #endif | |
1da177e4 LT |
660 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
661 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
131afd0b SF |
662 | #ifdef CONFIG_CIFS_STATS2 |
663 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 664 | midQ->when_sent = jiffies; |
131afd0b | 665 | #endif |
7ee1af76 JA |
666 | up(&ses->server->tcpSem); |
667 | ||
668 | if(rc < 0) | |
669 | goto out; | |
670 | ||
1da177e4 | 671 | if (long_op == -1) |
7ee1af76 | 672 | goto out; |
275cde1a | 673 | else if (long_op == 2) /* writes past end of file can take loong time */ |
37c0eb46 | 674 | timeout = 180 * HZ; |
1da177e4 LT |
675 | else if (long_op == 1) |
676 | timeout = 45 * HZ; /* should be greater than | |
677 | servers oplock break timeout (about 43 seconds) */ | |
7ee1af76 | 678 | else |
1da177e4 LT |
679 | timeout = 15 * HZ; |
680 | /* wait for 15 seconds or until woken up due to response arriving or | |
681 | due to last connection to this server being unmounted */ | |
682 | if (signal_pending(current)) { | |
683 | /* if signal pending do not hold up user for full smb timeout | |
684 | but we still give response a change to complete */ | |
685 | timeout = 2 * HZ; | |
686 | } | |
687 | ||
688 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 689 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
690 | |
691 | spin_lock(&GlobalMid_Lock); | |
692 | if (midQ->resp_buf) { | |
693 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 694 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 695 | } else { |
37c0eb46 SF |
696 | cERROR(1,("No response for cmd %d mid %d", |
697 | midQ->command, midQ->mid)); | |
1da177e4 LT |
698 | if(midQ->midState == MID_REQUEST_SUBMITTED) { |
699 | if(ses->server->tcpStatus == CifsExiting) | |
700 | rc = -EHOSTDOWN; | |
701 | else { | |
702 | ses->server->tcpStatus = CifsNeedReconnect; | |
703 | midQ->midState = MID_RETRY_NEEDED; | |
704 | } | |
705 | } | |
706 | ||
707 | if (rc != -EHOSTDOWN) { | |
708 | if(midQ->midState == MID_RETRY_NEEDED) { | |
709 | rc = -EAGAIN; | |
710 | cFYI(1,("marking request for retry")); | |
711 | } else { | |
712 | rc = -EIO; | |
713 | } | |
714 | } | |
715 | spin_unlock(&GlobalMid_Lock); | |
716 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
717 | /* Update # of requests on wire to server */ |
718 | atomic_dec(&ses->server->inFlight); | |
719 | wake_up(&ses->server->request_q); | |
1da177e4 LT |
720 | return rc; |
721 | } | |
722 | ||
723 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { | |
ad009ac9 | 724 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
725 | receive_len, xid)); |
726 | rc = -EIO; | |
727 | } else { /* rcvd frame is ok */ | |
728 | ||
729 | if (midQ->resp_buf && out_buf | |
730 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
731 | out_buf->smb_buf_length = receive_len; | |
732 | memcpy((char *)out_buf + 4, | |
733 | (char *)midQ->resp_buf + 4, | |
734 | receive_len); | |
735 | ||
736 | dump_smb(out_buf, 92); | |
737 | /* convert the length into a more usable form */ | |
738 | if((receive_len > 24) && | |
ad009ac9 SF |
739 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
740 | SECMODE_SIGN_ENABLED))) { | |
741 | rc = cifs_verify_signature(out_buf, | |
742 | ses->server->mac_signing_key, | |
743 | midQ->sequence_number+1); | |
744 | if(rc) { | |
275cde1a SF |
745 | cERROR(1,("Unexpected SMB signature")); |
746 | /* BB FIXME add code to kill session */ | |
ad009ac9 | 747 | } |
1da177e4 LT |
748 | } |
749 | ||
750 | *pbytes_returned = out_buf->smb_buf_length; | |
751 | ||
ad009ac9 | 752 | /* BB special case reconnect tid and uid here? */ |
1da177e4 LT |
753 | rc = map_smb_to_linux_error(out_buf); |
754 | ||
755 | /* convert ByteCount if necessary */ | |
756 | if (receive_len >= | |
757 | sizeof (struct smb_hdr) - | |
758 | 4 /* do not count RFC1001 header */ + | |
759 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
0f2b27c4 | 760 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
761 | } else { |
762 | rc = -EIO; | |
ec637e3f | 763 | cERROR(1,("Bad MID state?")); |
1da177e4 LT |
764 | } |
765 | } | |
7ee1af76 JA |
766 | |
767 | out: | |
768 | ||
1da177e4 | 769 | DeleteMidQEntry(midQ); |
7ee1af76 JA |
770 | atomic_dec(&ses->server->inFlight); |
771 | wake_up(&ses->server->request_q); | |
1da177e4 | 772 | |
7ee1af76 JA |
773 | return rc; |
774 | } | |
1da177e4 | 775 | |
7ee1af76 JA |
776 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
777 | ||
778 | static int | |
779 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
780 | struct mid_q_entry *midQ) | |
781 | { | |
782 | int rc = 0; | |
783 | struct cifsSesInfo *ses = tcon->ses; | |
784 | __u16 mid = in_buf->Mid; | |
785 | ||
786 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
787 | in_buf->Mid = mid; | |
788 | down(&ses->server->tcpSem); | |
789 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
790 | if (rc) { | |
791 | up(&ses->server->tcpSem); | |
792 | return rc; | |
793 | } | |
794 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
795 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
796 | up(&ses->server->tcpSem); | |
1da177e4 | 797 | return rc; |
7ee1af76 JA |
798 | } |
799 | ||
800 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
801 | blocking lock to return. */ | |
802 | ||
803 | static int | |
804 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
805 | struct smb_hdr *in_buf, | |
806 | struct smb_hdr *out_buf) | |
807 | { | |
808 | int bytes_returned; | |
809 | struct cifsSesInfo *ses = tcon->ses; | |
810 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
811 | ||
812 | /* We just modify the current in_buf to change | |
813 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
814 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
815 | LOCKING_ANDX_CANCEL_LOCK. */ | |
816 | ||
817 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
818 | pSMB->Timeout = 0; | |
819 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
820 | ||
821 | return SendReceive(xid, ses, in_buf, out_buf, | |
822 | &bytes_returned, 0); | |
823 | } | |
824 | ||
825 | int | |
826 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
827 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
828 | int *pbytes_returned) | |
829 | { | |
830 | int rc = 0; | |
831 | int rstart = 0; | |
832 | unsigned int receive_len; | |
833 | struct mid_q_entry *midQ; | |
834 | struct cifsSesInfo *ses; | |
835 | ||
836 | if (tcon == NULL || tcon->ses == NULL) { | |
837 | cERROR(1,("Null smb session")); | |
838 | return -EIO; | |
839 | } | |
840 | ses = tcon->ses; | |
841 | ||
842 | if(ses->server == NULL) { | |
843 | cERROR(1,("Null tcp session")); | |
844 | return -EIO; | |
845 | } | |
846 | ||
847 | if(ses->server->tcpStatus == CifsExiting) | |
848 | return -ENOENT; | |
849 | ||
850 | /* Ensure that we do not send more than 50 overlapping requests | |
851 | to the same server. We may make this configurable later or | |
852 | use ses->maxReq */ | |
853 | ||
854 | rc = wait_for_free_request(ses, 3); | |
855 | if (rc) | |
856 | return rc; | |
857 | ||
858 | /* make sure that we sign in the same order that we send on this socket | |
859 | and avoid races inside tcp sendmsg code that could cause corruption | |
860 | of smb data */ | |
861 | ||
862 | down(&ses->server->tcpSem); | |
863 | ||
864 | rc = allocate_mid(ses, in_buf, &midQ); | |
865 | if (rc) { | |
866 | up(&ses->server->tcpSem); | |
867 | return rc; | |
868 | } | |
869 | ||
870 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
871 | up(&ses->server->tcpSem); | |
872 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
873 | in_buf->smb_buf_length)); | |
874 | DeleteMidQEntry(midQ); | |
875 | return -EIO; | |
876 | } | |
877 | ||
878 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
1da177e4 | 879 | |
7ee1af76 JA |
880 | midQ->midState = MID_REQUEST_SUBMITTED; |
881 | #ifdef CONFIG_CIFS_STATS2 | |
882 | atomic_inc(&ses->server->inSend); | |
883 | #endif | |
884 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
885 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
886 | #ifdef CONFIG_CIFS_STATS2 | |
887 | atomic_dec(&ses->server->inSend); | |
888 | midQ->when_sent = jiffies; | |
889 | #endif | |
1da177e4 | 890 | up(&ses->server->tcpSem); |
7ee1af76 JA |
891 | |
892 | if(rc < 0) { | |
893 | DeleteMidQEntry(midQ); | |
894 | return rc; | |
895 | } | |
896 | ||
897 | /* Wait for a reply - allow signals to interrupt. */ | |
898 | rc = wait_event_interruptible(ses->server->response_q, | |
899 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || | |
900 | ((ses->server->tcpStatus != CifsGood) && | |
901 | (ses->server->tcpStatus != CifsNew))); | |
902 | ||
903 | /* Were we interrupted by a signal ? */ | |
904 | if ((rc == -ERESTARTSYS) && | |
905 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
906 | ((ses->server->tcpStatus == CifsGood) || | |
907 | (ses->server->tcpStatus == CifsNew))) { | |
908 | ||
909 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
910 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
911 | blocking lock to return. */ | |
912 | ||
913 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
914 | if (rc) { | |
915 | DeleteMidQEntry(midQ); | |
916 | return rc; | |
917 | } | |
918 | } else { | |
919 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
920 | to cause the blocking lock to return. */ | |
921 | ||
922 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
923 | ||
924 | /* If we get -ENOLCK back the lock may have | |
925 | already been removed. Don't exit in this case. */ | |
926 | if (rc && rc != -ENOLCK) { | |
927 | DeleteMidQEntry(midQ); | |
928 | return rc; | |
929 | } | |
930 | } | |
931 | ||
932 | /* Wait 5 seconds for the response. */ | |
933 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ)==0) { | |
934 | /* We got the response - restart system call. */ | |
935 | rstart = 1; | |
936 | } | |
937 | } | |
938 | ||
939 | spin_lock(&GlobalMid_Lock); | |
940 | if (midQ->resp_buf) { | |
941 | spin_unlock(&GlobalMid_Lock); | |
942 | receive_len = midQ->resp_buf->smb_buf_length; | |
943 | } else { | |
944 | cERROR(1,("No response for cmd %d mid %d", | |
945 | midQ->command, midQ->mid)); | |
946 | if(midQ->midState == MID_REQUEST_SUBMITTED) { | |
947 | if(ses->server->tcpStatus == CifsExiting) | |
948 | rc = -EHOSTDOWN; | |
949 | else { | |
950 | ses->server->tcpStatus = CifsNeedReconnect; | |
951 | midQ->midState = MID_RETRY_NEEDED; | |
952 | } | |
953 | } | |
954 | ||
955 | if (rc != -EHOSTDOWN) { | |
956 | if(midQ->midState == MID_RETRY_NEEDED) { | |
957 | rc = -EAGAIN; | |
958 | cFYI(1,("marking request for retry")); | |
959 | } else { | |
960 | rc = -EIO; | |
961 | } | |
962 | } | |
963 | spin_unlock(&GlobalMid_Lock); | |
964 | DeleteMidQEntry(midQ); | |
965 | return rc; | |
1da177e4 | 966 | } |
7ee1af76 JA |
967 | |
968 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { | |
969 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
970 | receive_len, xid)); | |
971 | rc = -EIO; | |
972 | } else { /* rcvd frame is ok */ | |
973 | ||
974 | if (midQ->resp_buf && out_buf | |
975 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
976 | out_buf->smb_buf_length = receive_len; | |
977 | memcpy((char *)out_buf + 4, | |
978 | (char *)midQ->resp_buf + 4, | |
979 | receive_len); | |
980 | ||
981 | dump_smb(out_buf, 92); | |
982 | /* convert the length into a more usable form */ | |
983 | if((receive_len > 24) && | |
984 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
985 | SECMODE_SIGN_ENABLED))) { | |
986 | rc = cifs_verify_signature(out_buf, | |
987 | ses->server->mac_signing_key, | |
988 | midQ->sequence_number+1); | |
989 | if(rc) { | |
990 | cERROR(1,("Unexpected SMB signature")); | |
991 | /* BB FIXME add code to kill session */ | |
992 | } | |
993 | } | |
994 | ||
995 | *pbytes_returned = out_buf->smb_buf_length; | |
996 | ||
997 | /* BB special case reconnect tid and uid here? */ | |
998 | rc = map_smb_to_linux_error(out_buf); | |
1da177e4 | 999 | |
7ee1af76 JA |
1000 | /* convert ByteCount if necessary */ |
1001 | if (receive_len >= | |
1002 | sizeof (struct smb_hdr) - | |
1003 | 4 /* do not count RFC1001 header */ + | |
1004 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
1005 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1006 | } else { | |
1007 | rc = -EIO; | |
1008 | cERROR(1,("Bad MID state?")); | |
1009 | } | |
1010 | } | |
1011 | DeleteMidQEntry(midQ); | |
1012 | if (rstart && rc == -EACCES) | |
1013 | return -ERESTARTSYS; | |
1da177e4 LT |
1014 | return rc; |
1015 | } |