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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 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 | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
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" | |
50c2f753 | 35 | |
1da177e4 | 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 * | |
24b9b06b | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
24b9b06b | 44 | if (server == NULL) { |
1da177e4 LT |
45 | cERROR(1, ("Null TCP session in AllocMidQEntry")); |
46 | return NULL; | |
47 | } | |
50c2f753 | 48 | |
232087cb | 49 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
50 | if (temp == NULL) |
51 | return temp; | |
52 | else { | |
26f57364 | 53 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
54 | temp->mid = smb_buffer->Mid; /* always LE */ |
55 | temp->pid = current->pid; | |
56 | temp->command = smb_buffer->Command; | |
57 | cFYI(1, ("For smb_command %d", temp->command)); | |
1047abc1 SF |
58 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
59 | /* when mid allocated can be before when sent */ | |
60 | temp->when_alloc = jiffies; | |
1da177e4 LT |
61 | temp->tsk = current; |
62 | } | |
63 | ||
64 | spin_lock(&GlobalMid_Lock); | |
24b9b06b | 65 | list_add_tail(&temp->qhead, &server->pending_mid_q); |
1da177e4 LT |
66 | atomic_inc(&midCount); |
67 | temp->midState = MID_REQUEST_ALLOCATED; | |
68 | spin_unlock(&GlobalMid_Lock); | |
69 | return temp; | |
70 | } | |
71 | ||
72 | static void | |
73 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
74 | { | |
1047abc1 SF |
75 | #ifdef CONFIG_CIFS_STATS2 |
76 | unsigned long now; | |
77 | #endif | |
1da177e4 LT |
78 | spin_lock(&GlobalMid_Lock); |
79 | midEntry->midState = MID_FREE; | |
80 | list_del(&midEntry->qhead); | |
81 | atomic_dec(&midCount); | |
82 | spin_unlock(&GlobalMid_Lock); | |
79a58d1f | 83 | if (midEntry->largeBuf) |
b8643e1b SF |
84 | cifs_buf_release(midEntry->resp_buf); |
85 | else | |
86 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
87 | #ifdef CONFIG_CIFS_STATS2 |
88 | now = jiffies; | |
89 | /* commands taking longer than one second are indications that | |
90 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
91 | if ((now - midEntry->when_alloc) > HZ) { |
92 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
93 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
94 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
95 | midEntry->command, midEntry->mid); | |
96 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
97 | now - midEntry->when_alloc, | |
98 | now - midEntry->when_sent, | |
99 | now - midEntry->when_received); | |
100 | } | |
101 | } | |
102 | #endif | |
1da177e4 LT |
103 | mempool_free(midEntry, cifs_mid_poolp); |
104 | } | |
105 | ||
106 | struct oplock_q_entry * | |
79a58d1f | 107 | AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
1da177e4 LT |
108 | { |
109 | struct oplock_q_entry *temp; | |
79a58d1f | 110 | if ((pinode == NULL) || (tcon == NULL)) { |
1da177e4 LT |
111 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
112 | return NULL; | |
113 | } | |
114 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, | |
e94b1766 | 115 | GFP_KERNEL); |
1da177e4 LT |
116 | if (temp == NULL) |
117 | return temp; | |
118 | else { | |
119 | temp->pinode = pinode; | |
120 | temp->tcon = tcon; | |
121 | temp->netfid = fid; | |
122 | spin_lock(&GlobalMid_Lock); | |
123 | list_add_tail(&temp->qhead, &GlobalOplock_Q); | |
124 | spin_unlock(&GlobalMid_Lock); | |
125 | } | |
126 | return temp; | |
127 | ||
128 | } | |
129 | ||
79a58d1f | 130 | void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
1da177e4 | 131 | { |
79a58d1f | 132 | spin_lock(&GlobalMid_Lock); |
1da177e4 LT |
133 | /* should we check if list empty first? */ |
134 | list_del(&oplockEntry->qhead); | |
135 | spin_unlock(&GlobalMid_Lock); | |
136 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); | |
137 | } | |
138 | ||
5d941ca6 SF |
139 | |
140 | void DeleteTconOplockQEntries(struct cifsTconInfo *tcon) | |
141 | { | |
142 | struct oplock_q_entry *temp; | |
143 | ||
144 | if (tcon == NULL) | |
145 | return; | |
146 | ||
147 | spin_lock(&GlobalMid_Lock); | |
148 | list_for_each_entry(temp, &GlobalOplock_Q, qhead) { | |
149 | if ((temp->tcon) && (temp->tcon == tcon)) { | |
150 | list_del(&temp->qhead); | |
151 | kmem_cache_free(cifs_oplock_cachep, temp); | |
152 | } | |
153 | } | |
154 | spin_unlock(&GlobalMid_Lock); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | int |
158 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
edf1ae40 | 159 | unsigned int smb_buf_length, struct sockaddr *sin, bool noblocksnd) |
1da177e4 LT |
160 | { |
161 | int rc = 0; | |
162 | int i = 0; | |
163 | struct msghdr smb_msg; | |
164 | struct kvec iov; | |
165 | unsigned len = smb_buf_length + 4; | |
166 | ||
79a58d1f | 167 | if (ssocket == NULL) |
1da177e4 LT |
168 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
169 | iov.iov_base = smb_buffer; | |
170 | iov.iov_len = len; | |
171 | ||
172 | smb_msg.msg_name = sin; | |
26f57364 | 173 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
174 | smb_msg.msg_control = NULL; |
175 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
176 | if (noblocksnd) |
177 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
178 | else | |
179 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
180 | |
181 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
182 | area, and byte area if necessary, is converted to littleendian in |
183 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
184 | Flags2 is converted in SendReceive */ |
185 | ||
186 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); | |
3e84469d | 187 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
1da177e4 LT |
188 | dump_smb(smb_buffer, len); |
189 | ||
190 | while (len > 0) { | |
191 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
192 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
193 | i++; | |
3e84469d | 194 | /* smaller timeout here than send2 since smaller size */ |
79a58d1f SF |
195 | /* Although it may not be required, this also is smaller |
196 | oplock break time */ | |
197 | if (i > 12) { | |
1da177e4 | 198 | cERROR(1, |
68058e75 | 199 | ("sends on sock %p stuck for 7 seconds", |
1da177e4 LT |
200 | ssocket)); |
201 | rc = -EAGAIN; | |
202 | break; | |
203 | } | |
68058e75 | 204 | msleep(1 << i); |
1da177e4 LT |
205 | continue; |
206 | } | |
79a58d1f | 207 | if (rc < 0) |
1da177e4 | 208 | break; |
5e1253b5 SF |
209 | else |
210 | i = 0; /* reset i after each successful send */ | |
1da177e4 LT |
211 | iov.iov_base += rc; |
212 | iov.iov_len -= rc; | |
213 | len -= rc; | |
214 | } | |
215 | ||
216 | if (rc < 0) { | |
79a58d1f | 217 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
1da177e4 LT |
218 | } else { |
219 | rc = 0; | |
220 | } | |
221 | ||
7ee1af76 JA |
222 | /* Don't want to modify the buffer as a |
223 | side effect of this call. */ | |
224 | smb_buffer->smb_buf_length = smb_buf_length; | |
225 | ||
1da177e4 LT |
226 | return rc; |
227 | } | |
228 | ||
d6e04ae6 | 229 | static int |
edf1ae40 SF |
230 | smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec, |
231 | struct sockaddr *sin, bool noblocksnd) | |
1da177e4 LT |
232 | { |
233 | int rc = 0; | |
234 | int i = 0; | |
235 | struct msghdr smb_msg; | |
3e84469d SF |
236 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
237 | unsigned int len = iov[0].iov_len; | |
238 | unsigned int total_len; | |
239 | int first_vec = 0; | |
7ee1af76 | 240 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 241 | struct socket *ssocket = server->ssocket; |
50c2f753 | 242 | |
79a58d1f | 243 | if (ssocket == NULL) |
1da177e4 | 244 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 245 | |
1da177e4 | 246 | smb_msg.msg_name = sin; |
26f57364 | 247 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
248 | smb_msg.msg_control = NULL; |
249 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
250 | if (noblocksnd) |
251 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
252 | else | |
253 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
254 | |
255 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
256 | area, and byte area if necessary, is converted to littleendian in |
257 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
258 | Flags2 is converted in SendReceive */ |
259 | ||
3e84469d SF |
260 | |
261 | total_len = 0; | |
262 | for (i = 0; i < n_vec; i++) | |
263 | total_len += iov[i].iov_len; | |
264 | ||
1da177e4 | 265 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 266 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
267 | dump_smb(smb_buffer, len); |
268 | ||
17680356 | 269 | i = 0; |
3e84469d SF |
270 | while (total_len) { |
271 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
272 | n_vec - first_vec, total_len); | |
1da177e4 LT |
273 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
274 | i++; | |
79a58d1f | 275 | if (i >= 14) { |
1da177e4 | 276 | cERROR(1, |
68058e75 | 277 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
278 | ssocket)); |
279 | rc = -EAGAIN; | |
280 | break; | |
281 | } | |
68058e75 | 282 | msleep(1 << i); |
1da177e4 LT |
283 | continue; |
284 | } | |
79a58d1f | 285 | if (rc < 0) |
1da177e4 | 286 | break; |
3e84469d | 287 | |
61de800d SF |
288 | if (rc == total_len) { |
289 | total_len = 0; | |
290 | break; | |
291 | } else if (rc > total_len) { | |
292 | cERROR(1, ("sent %d requested %d", rc, total_len)); | |
3e84469d SF |
293 | break; |
294 | } | |
79a58d1f | 295 | if (rc == 0) { |
3e84469d SF |
296 | /* should never happen, letting socket clear before |
297 | retrying is our only obvious option here */ | |
79a58d1f | 298 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
299 | msleep(500); |
300 | continue; | |
d6e04ae6 | 301 | } |
3e84469d | 302 | total_len -= rc; |
68058e75 | 303 | /* the line below resets i */ |
3e84469d SF |
304 | for (i = first_vec; i < n_vec; i++) { |
305 | if (iov[i].iov_len) { | |
306 | if (rc > iov[i].iov_len) { | |
307 | rc -= iov[i].iov_len; | |
308 | iov[i].iov_len = 0; | |
309 | } else { | |
310 | iov[i].iov_base += rc; | |
311 | iov[i].iov_len -= rc; | |
312 | first_vec = i; | |
313 | break; | |
314 | } | |
315 | } | |
d6e04ae6 | 316 | } |
5e1253b5 | 317 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
318 | } |
319 | ||
edf1ae40 SF |
320 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
321 | cFYI(1, ("partial send (%d remaining), terminating session", | |
322 | total_len)); | |
323 | /* If we have only sent part of an SMB then the next SMB | |
324 | could be taken as the remainder of this one. We need | |
325 | to kill the socket so the server throws away the partial | |
326 | SMB */ | |
327 | server->tcpStatus = CifsNeedReconnect; | |
328 | } | |
329 | ||
1da177e4 | 330 | if (rc < 0) { |
79a58d1f | 331 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 332 | } else |
1da177e4 | 333 | rc = 0; |
1da177e4 | 334 | |
7ee1af76 JA |
335 | /* Don't want to modify the buffer as a |
336 | side effect of this call. */ | |
337 | smb_buffer->smb_buf_length = smb_buf_length; | |
338 | ||
1da177e4 LT |
339 | return rc; |
340 | } | |
341 | ||
7ee1af76 | 342 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 343 | { |
133672ef | 344 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
345 | /* oplock breaks must not be held up */ |
346 | atomic_inc(&ses->server->inFlight); | |
347 | } else { | |
79a58d1f SF |
348 | spin_lock(&GlobalMid_Lock); |
349 | while (1) { | |
350 | if (atomic_read(&ses->server->inFlight) >= | |
d6e04ae6 | 351 | cifs_max_pending){ |
1da177e4 | 352 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
353 | #ifdef CONFIG_CIFS_STATS2 |
354 | atomic_inc(&ses->server->num_waiters); | |
355 | #endif | |
1da177e4 LT |
356 | wait_event(ses->server->request_q, |
357 | atomic_read(&ses->server->inFlight) | |
358 | < cifs_max_pending); | |
131afd0b SF |
359 | #ifdef CONFIG_CIFS_STATS2 |
360 | atomic_dec(&ses->server->num_waiters); | |
361 | #endif | |
1da177e4 LT |
362 | spin_lock(&GlobalMid_Lock); |
363 | } else { | |
79a58d1f | 364 | if (ses->server->tcpStatus == CifsExiting) { |
1da177e4 LT |
365 | spin_unlock(&GlobalMid_Lock); |
366 | return -ENOENT; | |
367 | } | |
368 | ||
79a58d1f SF |
369 | /* can not count locking commands against total |
370 | as they are allowed to block on server */ | |
50c2f753 | 371 | |
1da177e4 | 372 | /* update # of requests on the wire to server */ |
133672ef | 373 | if (long_op != CIFS_BLOCKING_OP) |
1da177e4 | 374 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
375 | spin_unlock(&GlobalMid_Lock); |
376 | break; | |
377 | } | |
378 | } | |
379 | } | |
7ee1af76 JA |
380 | return 0; |
381 | } | |
1da177e4 | 382 | |
7ee1af76 JA |
383 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
384 | struct mid_q_entry **ppmidQ) | |
385 | { | |
1da177e4 | 386 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 387 | return -ENOENT; |
1da177e4 | 388 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
79a58d1f | 389 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 390 | return -EAGAIN; |
1da177e4 LT |
391 | } else if (ses->status != CifsGood) { |
392 | /* check if SMB session is bad because we are setting it up */ | |
79a58d1f | 393 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 394 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 395 | return -EAGAIN; |
ad7a2926 | 396 | /* else ok - we are setting up session */ |
1da177e4 | 397 | } |
24b9b06b | 398 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 399 | if (*ppmidQ == NULL) |
7ee1af76 | 400 | return -ENOMEM; |
7ee1af76 JA |
401 | return 0; |
402 | } | |
403 | ||
79a58d1f | 404 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
405 | struct mid_q_entry *midQ, |
406 | unsigned long timeout, | |
407 | unsigned long time_to_wait) | |
408 | { | |
409 | unsigned long curr_timeout; | |
410 | ||
411 | for (;;) { | |
412 | curr_timeout = timeout + jiffies; | |
85705524 JL |
413 | wait_event_timeout(ses->server->response_q, |
414 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); | |
7ee1af76 JA |
415 | |
416 | if (time_after(jiffies, curr_timeout) && | |
417 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
418 | ((ses->server->tcpStatus == CifsGood) || | |
419 | (ses->server->tcpStatus == CifsNew))) { | |
420 | ||
421 | unsigned long lrt; | |
422 | ||
423 | /* We timed out. Is the server still | |
424 | sending replies ? */ | |
425 | spin_lock(&GlobalMid_Lock); | |
426 | lrt = ses->server->lstrp; | |
427 | spin_unlock(&GlobalMid_Lock); | |
428 | ||
429 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 430 | Although we prefer not to time out if the |
7ee1af76 | 431 | server is still responding - we will time |
79a58d1f | 432 | out if the server takes more than 15 (or 45 |
7ee1af76 | 433 | or 180) seconds to respond to this request |
79a58d1f | 434 | and has not responded to any request from |
7ee1af76 JA |
435 | other threads on the client within 10 seconds */ |
436 | lrt += time_to_wait; | |
437 | if (time_after(jiffies, lrt)) { | |
438 | /* No replies for time_to_wait. */ | |
79a58d1f | 439 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
440 | return -1; |
441 | } | |
442 | } else { | |
443 | return 0; | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
133672ef SF |
448 | |
449 | /* | |
450 | * | |
451 | * Send an SMB Request. No response info (other than return code) | |
452 | * needs to be parsed. | |
453 | * | |
454 | * flags indicate the type of request buffer and how long to wait | |
455 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
456 | * | |
457 | */ | |
458 | int | |
459 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
460 | struct smb_hdr *in_buf, int flags) | |
461 | { | |
462 | int rc; | |
463 | struct kvec iov[1]; | |
464 | int resp_buf_type; | |
465 | ||
466 | iov[0].iov_base = (char *)in_buf; | |
467 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
468 | flags |= CIFS_NO_RESP; | |
469 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
470 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
471 | ||
133672ef SF |
472 | return rc; |
473 | } | |
474 | ||
7ee1af76 | 475 | int |
79a58d1f SF |
476 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
477 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 478 | const int flags) |
7ee1af76 JA |
479 | { |
480 | int rc = 0; | |
133672ef | 481 | int long_op; |
7ee1af76 JA |
482 | unsigned int receive_len; |
483 | unsigned long timeout; | |
484 | struct mid_q_entry *midQ; | |
485 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 486 | |
133672ef SF |
487 | long_op = flags & CIFS_TIMEOUT_MASK; |
488 | ||
7ee1af76 JA |
489 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
490 | ||
491 | if ((ses == NULL) || (ses->server == NULL)) { | |
492 | cifs_small_buf_release(in_buf); | |
79a58d1f | 493 | cERROR(1, ("Null session")); |
7ee1af76 JA |
494 | return -EIO; |
495 | } | |
496 | ||
79a58d1f | 497 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
498 | cifs_small_buf_release(in_buf); |
499 | return -ENOENT; | |
500 | } | |
501 | ||
79a58d1f | 502 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
503 | to the same server. We may make this configurable later or |
504 | use ses->maxReq */ | |
505 | ||
506 | rc = wait_for_free_request(ses, long_op); | |
507 | if (rc) { | |
508 | cifs_small_buf_release(in_buf); | |
509 | return rc; | |
510 | } | |
511 | ||
79a58d1f | 512 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
513 | and avoid races inside tcp sendmsg code that could cause corruption |
514 | of smb data */ | |
515 | ||
72ca545b | 516 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
517 | |
518 | rc = allocate_mid(ses, in_buf, &midQ); | |
519 | if (rc) { | |
72ca545b | 520 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 521 | cifs_small_buf_release(in_buf); |
7ee1af76 | 522 | /* Update # of requests on wire to server */ |
79a58d1f | 523 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
524 | wake_up(&ses->server->request_q); |
525 | return rc; | |
1da177e4 | 526 | } |
79a58d1f | 527 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
528 | |
529 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
530 | #ifdef CONFIG_CIFS_STATS2 |
531 | atomic_inc(&ses->server->inSend); | |
532 | #endif | |
edf1ae40 SF |
533 | rc = smb_send2(ses->server, iov, n_vec, |
534 | (struct sockaddr *) &(ses->server->addr.sockAddr), | |
535 | ses->server->noblocksnd); | |
131afd0b SF |
536 | #ifdef CONFIG_CIFS_STATS2 |
537 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 538 | midQ->when_sent = jiffies; |
131afd0b | 539 | #endif |
7ee1af76 | 540 | |
72ca545b | 541 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
542 | cifs_small_buf_release(in_buf); |
543 | ||
79a58d1f | 544 | if (rc < 0) |
7ee1af76 | 545 | goto out; |
4b8f930f | 546 | |
133672ef SF |
547 | if (long_op == CIFS_STD_OP) |
548 | timeout = 15 * HZ; | |
549 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 550 | timeout = 180 * HZ; |
133672ef | 551 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 552 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 553 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
554 | else if (long_op == CIFS_ASYNC_OP) |
555 | goto out; | |
556 | else if (long_op == CIFS_BLOCKING_OP) | |
557 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
558 | else { | |
559 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
560 | rc = -EIO; | |
561 | goto out; | |
562 | } | |
7ee1af76 | 563 | |
79a58d1f | 564 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
565 | due to last connection to this server being unmounted */ |
566 | if (signal_pending(current)) { | |
567 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 568 | but we still give response a chance to complete */ |
d6e04ae6 | 569 | timeout = 2 * HZ; |
79a58d1f | 570 | } |
d6e04ae6 SF |
571 | |
572 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 573 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
574 | |
575 | spin_lock(&GlobalMid_Lock); | |
576 | if (midQ->resp_buf) { | |
577 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 578 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 579 | } else { |
79a58d1f | 580 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 581 | midQ->command, midQ->mid)); |
79a58d1f SF |
582 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
583 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
584 | rc = -EHOSTDOWN; |
585 | else { | |
586 | ses->server->tcpStatus = CifsNeedReconnect; | |
587 | midQ->midState = MID_RETRY_NEEDED; | |
588 | } | |
589 | } | |
590 | ||
591 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 592 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 593 | rc = -EAGAIN; |
79a58d1f | 594 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
595 | } else { |
596 | rc = -EIO; | |
597 | } | |
598 | } | |
599 | spin_unlock(&GlobalMid_Lock); | |
600 | DeleteMidQEntry(midQ); | |
7ee1af76 | 601 | /* Update # of requests on wire to server */ |
79a58d1f | 602 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 603 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
604 | return rc; |
605 | } | |
50c2f753 | 606 | |
d6e04ae6 SF |
607 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
608 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
609 | receive_len, xid)); | |
610 | rc = -EIO; | |
611 | } else { /* rcvd frame is ok */ | |
79a58d1f | 612 | if (midQ->resp_buf && |
d6e04ae6 | 613 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
84afc29b | 614 | |
ec637e3f | 615 | iov[0].iov_base = (char *)midQ->resp_buf; |
79a58d1f | 616 | if (midQ->largeBuf) |
ec637e3f SF |
617 | *pRespBufType = CIFS_LARGE_BUFFER; |
618 | else | |
619 | *pRespBufType = CIFS_SMALL_BUFFER; | |
620 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 621 | |
ec637e3f | 622 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 | 623 | /* convert the length into a more usable form */ |
79a58d1f | 624 | if ((receive_len > 24) && |
d6e04ae6 SF |
625 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
626 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 627 | rc = cifs_verify_signature(midQ->resp_buf, |
b609f06a | 628 | &ses->server->mac_signing_key, |
d6e04ae6 | 629 | midQ->sequence_number+1); |
79a58d1f SF |
630 | if (rc) { |
631 | cERROR(1, ("Unexpected SMB signature")); | |
d6e04ae6 SF |
632 | /* BB FIXME add code to kill session */ |
633 | } | |
634 | } | |
635 | ||
d6e04ae6 | 636 | /* BB special case reconnect tid and uid here? */ |
133672ef SF |
637 | rc = map_smb_to_linux_error(midQ->resp_buf, |
638 | flags & CIFS_LOG_ERROR); | |
d6e04ae6 SF |
639 | |
640 | /* convert ByteCount if necessary */ | |
26f57364 SF |
641 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
642 | /* do not count RFC1001 header */ + | |
ec637e3f | 643 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
79a58d1f | 644 | BCC(midQ->resp_buf) = |
ec637e3f | 645 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
133672ef SF |
646 | if ((flags & CIFS_NO_RESP) == 0) |
647 | midQ->resp_buf = NULL; /* mark it so buf will | |
648 | not be freed by | |
649 | DeleteMidQEntry */ | |
d6e04ae6 SF |
650 | } else { |
651 | rc = -EIO; | |
79a58d1f | 652 | cFYI(1, ("Bad MID state?")); |
d6e04ae6 SF |
653 | } |
654 | } | |
1da177e4 | 655 | |
7ee1af76 | 656 | out: |
7ee1af76 | 657 | DeleteMidQEntry(midQ); |
79a58d1f | 658 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 659 | wake_up(&ses->server->request_q); |
1da177e4 | 660 | |
d6e04ae6 SF |
661 | return rc; |
662 | } | |
1da177e4 LT |
663 | |
664 | int | |
665 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
666 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
667 | int *pbytes_returned, const int long_op) | |
668 | { | |
669 | int rc = 0; | |
670 | unsigned int receive_len; | |
671 | unsigned long timeout; | |
672 | struct mid_q_entry *midQ; | |
673 | ||
674 | if (ses == NULL) { | |
79a58d1f | 675 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
676 | return -EIO; |
677 | } | |
79a58d1f SF |
678 | if (ses->server == NULL) { |
679 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
680 | return -EIO; |
681 | } | |
682 | ||
79a58d1f | 683 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
684 | return -ENOENT; |
685 | ||
79a58d1f | 686 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
687 | to the same server. We may make this configurable later or |
688 | use ses->maxReq */ | |
1da177e4 | 689 | |
7ee1af76 JA |
690 | rc = wait_for_free_request(ses, long_op); |
691 | if (rc) | |
692 | return rc; | |
693 | ||
79a58d1f | 694 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
695 | and avoid races inside tcp sendmsg code that could cause corruption |
696 | of smb data */ | |
697 | ||
72ca545b | 698 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 699 | |
7ee1af76 JA |
700 | rc = allocate_mid(ses, in_buf, &midQ); |
701 | if (rc) { | |
72ca545b | 702 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 703 | /* Update # of requests on wire to server */ |
79a58d1f | 704 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
705 | wake_up(&ses->server->request_q); |
706 | return rc; | |
1da177e4 LT |
707 | } |
708 | ||
709 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
26a21b98 | 710 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
1da177e4 LT |
711 | in_buf->smb_buf_length)); |
712 | DeleteMidQEntry(midQ); | |
72ca545b | 713 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 714 | /* Update # of requests on wire to server */ |
79a58d1f | 715 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 716 | wake_up(&ses->server->request_q); |
1da177e4 LT |
717 | return -EIO; |
718 | } | |
719 | ||
ad009ac9 | 720 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
721 | |
722 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
723 | #ifdef CONFIG_CIFS_STATS2 |
724 | atomic_inc(&ses->server->inSend); | |
725 | #endif | |
1da177e4 | 726 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
edf1ae40 SF |
727 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
728 | ses->server->noblocksnd); | |
131afd0b SF |
729 | #ifdef CONFIG_CIFS_STATS2 |
730 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 731 | midQ->when_sent = jiffies; |
131afd0b | 732 | #endif |
72ca545b | 733 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 734 | |
79a58d1f | 735 | if (rc < 0) |
7ee1af76 JA |
736 | goto out; |
737 | ||
133672ef SF |
738 | if (long_op == CIFS_STD_OP) |
739 | timeout = 15 * HZ; | |
740 | /* wait for 15 seconds or until woken up due to response arriving or | |
741 | due to last connection to this server being unmounted */ | |
742 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 743 | goto out; |
133672ef | 744 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 745 | timeout = 180 * HZ; |
133672ef | 746 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 747 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 748 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
749 | else if (long_op == CIFS_BLOCKING_OP) |
750 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
751 | else { | |
752 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
753 | rc = -EIO; | |
754 | goto out; | |
755 | } | |
756 | ||
1da177e4 LT |
757 | if (signal_pending(current)) { |
758 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 759 | but we still give response a chance to complete */ |
1da177e4 | 760 | timeout = 2 * HZ; |
79a58d1f | 761 | } |
1da177e4 LT |
762 | |
763 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 764 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
765 | |
766 | spin_lock(&GlobalMid_Lock); | |
767 | if (midQ->resp_buf) { | |
768 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 769 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 770 | } else { |
79a58d1f | 771 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 772 | midQ->command, midQ->mid)); |
79a58d1f SF |
773 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
774 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
775 | rc = -EHOSTDOWN; |
776 | else { | |
777 | ses->server->tcpStatus = CifsNeedReconnect; | |
778 | midQ->midState = MID_RETRY_NEEDED; | |
779 | } | |
780 | } | |
781 | ||
782 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 783 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 784 | rc = -EAGAIN; |
79a58d1f | 785 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
786 | } else { |
787 | rc = -EIO; | |
788 | } | |
789 | } | |
790 | spin_unlock(&GlobalMid_Lock); | |
791 | DeleteMidQEntry(midQ); | |
7ee1af76 | 792 | /* Update # of requests on wire to server */ |
79a58d1f | 793 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 794 | wake_up(&ses->server->request_q); |
1da177e4 LT |
795 | return rc; |
796 | } | |
50c2f753 | 797 | |
1da177e4 | 798 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 799 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
800 | receive_len, xid)); |
801 | rc = -EIO; | |
802 | } else { /* rcvd frame is ok */ | |
803 | ||
804 | if (midQ->resp_buf && out_buf | |
805 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
806 | out_buf->smb_buf_length = receive_len; | |
807 | memcpy((char *)out_buf + 4, | |
808 | (char *)midQ->resp_buf + 4, | |
809 | receive_len); | |
810 | ||
811 | dump_smb(out_buf, 92); | |
812 | /* convert the length into a more usable form */ | |
79a58d1f | 813 | if ((receive_len > 24) && |
ad009ac9 SF |
814 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
815 | SECMODE_SIGN_ENABLED))) { | |
816 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 817 | &ses->server->mac_signing_key, |
ad009ac9 | 818 | midQ->sequence_number+1); |
79a58d1f SF |
819 | if (rc) { |
820 | cERROR(1, ("Unexpected SMB signature")); | |
275cde1a | 821 | /* BB FIXME add code to kill session */ |
ad009ac9 | 822 | } |
1da177e4 LT |
823 | } |
824 | ||
825 | *pbytes_returned = out_buf->smb_buf_length; | |
826 | ||
ad009ac9 | 827 | /* BB special case reconnect tid and uid here? */ |
a761ac57 | 828 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 LT |
829 | |
830 | /* convert ByteCount if necessary */ | |
26f57364 SF |
831 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
832 | /* do not count RFC1001 header */ + | |
1da177e4 | 833 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
0f2b27c4 | 834 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
835 | } else { |
836 | rc = -EIO; | |
79a58d1f | 837 | cERROR(1, ("Bad MID state?")); |
1da177e4 LT |
838 | } |
839 | } | |
7ee1af76 JA |
840 | |
841 | out: | |
1da177e4 | 842 | DeleteMidQEntry(midQ); |
79a58d1f | 843 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 844 | wake_up(&ses->server->request_q); |
1da177e4 | 845 | |
7ee1af76 JA |
846 | return rc; |
847 | } | |
1da177e4 | 848 | |
7ee1af76 JA |
849 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
850 | ||
851 | static int | |
852 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
853 | struct mid_q_entry *midQ) | |
854 | { | |
855 | int rc = 0; | |
856 | struct cifsSesInfo *ses = tcon->ses; | |
857 | __u16 mid = in_buf->Mid; | |
858 | ||
859 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
860 | in_buf->Mid = mid; | |
72ca545b | 861 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
862 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
863 | if (rc) { | |
72ca545b | 864 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
865 | return rc; |
866 | } | |
867 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
868 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
869 | ses->server->noblocksnd); | |
72ca545b | 870 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 871 | return rc; |
7ee1af76 JA |
872 | } |
873 | ||
874 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
875 | blocking lock to return. */ | |
876 | ||
877 | static int | |
878 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
879 | struct smb_hdr *in_buf, | |
880 | struct smb_hdr *out_buf) | |
881 | { | |
882 | int bytes_returned; | |
883 | struct cifsSesInfo *ses = tcon->ses; | |
884 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
885 | ||
886 | /* We just modify the current in_buf to change | |
887 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
888 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
889 | LOCKING_ANDX_CANCEL_LOCK. */ | |
890 | ||
891 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
892 | pSMB->Timeout = 0; | |
893 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
894 | ||
895 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 896 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
897 | } |
898 | ||
899 | int | |
900 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
901 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
902 | int *pbytes_returned) | |
903 | { | |
904 | int rc = 0; | |
905 | int rstart = 0; | |
906 | unsigned int receive_len; | |
907 | struct mid_q_entry *midQ; | |
908 | struct cifsSesInfo *ses; | |
909 | ||
910 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 911 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
912 | return -EIO; |
913 | } | |
914 | ses = tcon->ses; | |
915 | ||
79a58d1f SF |
916 | if (ses->server == NULL) { |
917 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
918 | return -EIO; |
919 | } | |
920 | ||
79a58d1f | 921 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
922 | return -ENOENT; |
923 | ||
79a58d1f | 924 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
925 | to the same server. We may make this configurable later or |
926 | use ses->maxReq */ | |
927 | ||
133672ef | 928 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
929 | if (rc) |
930 | return rc; | |
931 | ||
79a58d1f | 932 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
933 | and avoid races inside tcp sendmsg code that could cause corruption |
934 | of smb data */ | |
935 | ||
72ca545b | 936 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
937 | |
938 | rc = allocate_mid(ses, in_buf, &midQ); | |
939 | if (rc) { | |
72ca545b | 940 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
941 | return rc; |
942 | } | |
943 | ||
944 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
72ca545b | 945 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
946 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
947 | in_buf->smb_buf_length)); | |
948 | DeleteMidQEntry(midQ); | |
949 | return -EIO; | |
950 | } | |
951 | ||
952 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
1da177e4 | 953 | |
7ee1af76 JA |
954 | midQ->midState = MID_REQUEST_SUBMITTED; |
955 | #ifdef CONFIG_CIFS_STATS2 | |
956 | atomic_inc(&ses->server->inSend); | |
957 | #endif | |
958 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
959 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
960 | ses->server->noblocksnd); | |
7ee1af76 JA |
961 | #ifdef CONFIG_CIFS_STATS2 |
962 | atomic_dec(&ses->server->inSend); | |
963 | midQ->when_sent = jiffies; | |
964 | #endif | |
72ca545b | 965 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 966 | |
79a58d1f | 967 | if (rc < 0) { |
7ee1af76 JA |
968 | DeleteMidQEntry(midQ); |
969 | return rc; | |
970 | } | |
971 | ||
972 | /* Wait for a reply - allow signals to interrupt. */ | |
973 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 974 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
975 | ((ses->server->tcpStatus != CifsGood) && |
976 | (ses->server->tcpStatus != CifsNew))); | |
977 | ||
978 | /* Were we interrupted by a signal ? */ | |
979 | if ((rc == -ERESTARTSYS) && | |
980 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
981 | ((ses->server->tcpStatus == CifsGood) || | |
982 | (ses->server->tcpStatus == CifsNew))) { | |
983 | ||
984 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
985 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
986 | blocking lock to return. */ | |
987 | ||
988 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
989 | if (rc) { | |
990 | DeleteMidQEntry(midQ); | |
991 | return rc; | |
992 | } | |
993 | } else { | |
994 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
995 | to cause the blocking lock to return. */ | |
996 | ||
997 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
998 | ||
999 | /* If we get -ENOLCK back the lock may have | |
1000 | already been removed. Don't exit in this case. */ | |
1001 | if (rc && rc != -ENOLCK) { | |
1002 | DeleteMidQEntry(midQ); | |
1003 | return rc; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 1008 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
1009 | /* We got the response - restart system call. */ |
1010 | rstart = 1; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | spin_lock(&GlobalMid_Lock); | |
1015 | if (midQ->resp_buf) { | |
1016 | spin_unlock(&GlobalMid_Lock); | |
1017 | receive_len = midQ->resp_buf->smb_buf_length; | |
1018 | } else { | |
79a58d1f | 1019 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 1020 | midQ->command, midQ->mid)); |
79a58d1f SF |
1021 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
1022 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
1023 | rc = -EHOSTDOWN; |
1024 | else { | |
1025 | ses->server->tcpStatus = CifsNeedReconnect; | |
1026 | midQ->midState = MID_RETRY_NEEDED; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 1031 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 1032 | rc = -EAGAIN; |
79a58d1f | 1033 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
1034 | } else { |
1035 | rc = -EIO; | |
1036 | } | |
1037 | } | |
1038 | spin_unlock(&GlobalMid_Lock); | |
1039 | DeleteMidQEntry(midQ); | |
1040 | return rc; | |
1da177e4 | 1041 | } |
50c2f753 | 1042 | |
7ee1af76 JA |
1043 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
1044 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
1045 | receive_len, xid)); | |
1046 | rc = -EIO; | |
1047 | } else { /* rcvd frame is ok */ | |
1048 | ||
1049 | if (midQ->resp_buf && out_buf | |
1050 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
1051 | out_buf->smb_buf_length = receive_len; | |
1052 | memcpy((char *)out_buf + 4, | |
1053 | (char *)midQ->resp_buf + 4, | |
1054 | receive_len); | |
1055 | ||
1056 | dump_smb(out_buf, 92); | |
1057 | /* convert the length into a more usable form */ | |
79a58d1f | 1058 | if ((receive_len > 24) && |
7ee1af76 JA |
1059 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
1060 | SECMODE_SIGN_ENABLED))) { | |
1061 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 1062 | &ses->server->mac_signing_key, |
7ee1af76 | 1063 | midQ->sequence_number+1); |
79a58d1f SF |
1064 | if (rc) { |
1065 | cERROR(1, ("Unexpected SMB signature")); | |
7ee1af76 JA |
1066 | /* BB FIXME add code to kill session */ |
1067 | } | |
1068 | } | |
1069 | ||
1070 | *pbytes_returned = out_buf->smb_buf_length; | |
1071 | ||
1072 | /* BB special case reconnect tid and uid here? */ | |
a761ac57 | 1073 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 | 1074 | |
7ee1af76 | 1075 | /* convert ByteCount if necessary */ |
26f57364 SF |
1076 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
1077 | /* do not count RFC1001 header */ + | |
7ee1af76 JA |
1078 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
1079 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1080 | } else { | |
1081 | rc = -EIO; | |
79a58d1f | 1082 | cERROR(1, ("Bad MID state?")); |
7ee1af76 JA |
1083 | } |
1084 | } | |
1085 | DeleteMidQEntry(midQ); | |
1086 | if (rstart && rc == -EACCES) | |
1087 | return -ERESTARTSYS; | |
1da177e4 LT |
1088 | return rc; |
1089 | } |