Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
33 | #include "cifspdu.h" | |
34 | #include "cifsglob.h" | |
35 | #include "cifsproto.h" | |
36 | #include "cifs_debug.h" | |
50c2f753 | 37 | |
2dc7e1c0 PS |
38 | void |
39 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
40 | { |
41 | wake_up_process(mid->callback_data); | |
42 | } | |
43 | ||
a6827c18 | 44 | struct mid_q_entry * |
24b9b06b | 45 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
46 | { |
47 | struct mid_q_entry *temp; | |
48 | ||
24b9b06b | 49 | if (server == NULL) { |
b6b38f70 | 50 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
51 | return NULL; |
52 | } | |
50c2f753 | 53 | |
232087cb | 54 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
55 | if (temp == NULL) |
56 | return temp; | |
57 | else { | |
26f57364 | 58 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
59 | temp->mid = smb_buffer->Mid; /* always LE */ |
60 | temp->pid = current->pid; | |
7c9421e1 PS |
61 | temp->command = cpu_to_le16(smb_buffer->Command); |
62 | cFYI(1, "For smb_command %d", smb_buffer->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; | |
2dc7e1c0 | 66 | temp->server = server; |
2b84a36c JL |
67 | |
68 | /* | |
69 | * The default is for the mid to be synchronous, so the | |
70 | * default callback just wakes up the current task. | |
71 | */ | |
2dc7e1c0 | 72 | temp->callback = cifs_wake_up_task; |
2b84a36c | 73 | temp->callback_data = current; |
1da177e4 LT |
74 | } |
75 | ||
1da177e4 | 76 | atomic_inc(&midCount); |
7c9421e1 | 77 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
78 | return temp; |
79 | } | |
80 | ||
766fdbb5 | 81 | void |
1da177e4 LT |
82 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
83 | { | |
1047abc1 | 84 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 85 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
86 | unsigned long now; |
87 | #endif | |
7c9421e1 | 88 | midEntry->mid_state = MID_FREE; |
8097531a | 89 | atomic_dec(&midCount); |
7c9421e1 | 90 | if (midEntry->large_buf) |
b8643e1b SF |
91 | cifs_buf_release(midEntry->resp_buf); |
92 | else | |
93 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
94 | #ifdef CONFIG_CIFS_STATS2 |
95 | now = jiffies; | |
96 | /* commands taking longer than one second are indications that | |
97 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f | 98 | if ((now - midEntry->when_alloc) > HZ) { |
2dc7e1c0 | 99 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
7c9421e1 | 100 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", |
1047abc1 SF |
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 | ||
3c1bf7e4 PS |
112 | void |
113 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
114 | { |
115 | spin_lock(&GlobalMid_Lock); | |
116 | list_del(&mid->qhead); | |
117 | spin_unlock(&GlobalMid_Lock); | |
118 | ||
119 | DeleteMidQEntry(mid); | |
120 | } | |
121 | ||
6f49f46b JL |
122 | /* |
123 | * smb_send_kvec - send an array of kvecs to the server | |
124 | * @server: Server to send the data to | |
125 | * @iov: Pointer to array of kvecs | |
126 | * @n_vec: length of kvec array | |
127 | * @sent: amount of data sent on socket is stored here | |
128 | * | |
129 | * Our basic "send data to server" function. Should be called with srv_mutex | |
130 | * held. The caller is responsible for handling the results. | |
131 | */ | |
d6e04ae6 | 132 | static int |
6f49f46b JL |
133 | smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec, |
134 | size_t *sent) | |
1da177e4 LT |
135 | { |
136 | int rc = 0; | |
137 | int i = 0; | |
138 | struct msghdr smb_msg; | |
6f49f46b JL |
139 | unsigned int remaining; |
140 | size_t first_vec = 0; | |
edf1ae40 | 141 | struct socket *ssocket = server->ssocket; |
50c2f753 | 142 | |
6f49f46b JL |
143 | *sent = 0; |
144 | ||
79a58d1f | 145 | if (ssocket == NULL) |
1da177e4 | 146 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 147 | |
a9f1b85e | 148 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 149 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
150 | smb_msg.msg_control = NULL; |
151 | smb_msg.msg_controllen = 0; | |
0496e02d | 152 | if (server->noblocksnd) |
edf1ae40 SF |
153 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
154 | else | |
155 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 156 | |
6f49f46b | 157 | remaining = 0; |
3e84469d | 158 | for (i = 0; i < n_vec; i++) |
6f49f46b | 159 | remaining += iov[i].iov_len; |
1da177e4 | 160 | |
17680356 | 161 | i = 0; |
6f49f46b JL |
162 | while (remaining) { |
163 | /* | |
164 | * If blocking send, we try 3 times, since each can block | |
165 | * for 5 seconds. For nonblocking we have to try more | |
166 | * but wait increasing amounts of time allowing time for | |
167 | * socket to clear. The overall time we wait in either | |
168 | * case to send on the socket is about 15 seconds. | |
169 | * Similarly we wait for 15 seconds for a response from | |
170 | * the server in SendReceive[2] for the server to send | |
171 | * a response back for most types of requests (except | |
172 | * SMB Write past end of file which can be slow, and | |
173 | * blocking lock operations). NFS waits slightly longer | |
174 | * than CIFS, but this can make it take longer for | |
175 | * nonresponsive servers to be detected and 15 seconds | |
176 | * is more than enough time for modern networks to | |
177 | * send a packet. In most cases if we fail to send | |
178 | * after the retries we will kill the socket and | |
179 | * reconnect which may clear the network problem. | |
180 | */ | |
3e84469d | 181 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
6f49f46b JL |
182 | n_vec - first_vec, remaining); |
183 | if (rc == -ENOSPC || rc == -EAGAIN) { | |
1da177e4 | 184 | i++; |
6f49f46b JL |
185 | if (i >= 14 || (!server->noblocksnd && (i > 2))) { |
186 | cERROR(1, "sends on sock %p stuck for 15 " | |
187 | "seconds", ssocket); | |
1da177e4 LT |
188 | rc = -EAGAIN; |
189 | break; | |
190 | } | |
68058e75 | 191 | msleep(1 << i); |
1da177e4 LT |
192 | continue; |
193 | } | |
6f49f46b | 194 | |
79a58d1f | 195 | if (rc < 0) |
1da177e4 | 196 | break; |
3e84469d | 197 | |
6f49f46b JL |
198 | /* send was at least partially successful */ |
199 | *sent += rc; | |
200 | ||
201 | if (rc == remaining) { | |
202 | remaining = 0; | |
61de800d | 203 | break; |
6f49f46b JL |
204 | } |
205 | ||
206 | if (rc > remaining) { | |
207 | cERROR(1, "sent %d requested %d", rc, remaining); | |
3e84469d SF |
208 | break; |
209 | } | |
6f49f46b | 210 | |
79a58d1f | 211 | if (rc == 0) { |
3e84469d SF |
212 | /* should never happen, letting socket clear before |
213 | retrying is our only obvious option here */ | |
b6b38f70 | 214 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
215 | msleep(500); |
216 | continue; | |
d6e04ae6 | 217 | } |
6f49f46b JL |
218 | |
219 | remaining -= rc; | |
220 | ||
68058e75 | 221 | /* the line below resets i */ |
3e84469d SF |
222 | for (i = first_vec; i < n_vec; i++) { |
223 | if (iov[i].iov_len) { | |
224 | if (rc > iov[i].iov_len) { | |
225 | rc -= iov[i].iov_len; | |
226 | iov[i].iov_len = 0; | |
227 | } else { | |
228 | iov[i].iov_base += rc; | |
229 | iov[i].iov_len -= rc; | |
230 | first_vec = i; | |
231 | break; | |
232 | } | |
233 | } | |
d6e04ae6 | 234 | } |
6f49f46b | 235 | |
5e1253b5 | 236 | i = 0; /* in case we get ENOSPC on the next send */ |
6f49f46b | 237 | rc = 0; |
1da177e4 | 238 | } |
6f49f46b JL |
239 | return rc; |
240 | } | |
241 | ||
242 | static int | |
243 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
244 | { | |
245 | int rc; | |
246 | struct kvec *iov = rqst->rq_iov; | |
247 | int n_vec = rqst->rq_nvec; | |
248 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
249 | size_t total_len; | |
250 | ||
251 | cFYI(1, "Sending smb: smb_len=%u", smb_buf_length); | |
252 | dump_smb(iov[0].iov_base, iov[0].iov_len); | |
253 | ||
254 | rc = smb_send_kvec(server, iov, n_vec, &total_len); | |
1da177e4 | 255 | |
edf1ae40 | 256 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
6f49f46b JL |
257 | cFYI(1, "partial send (wanted=%u sent=%zu): terminating " |
258 | "session", smb_buf_length + 4, total_len); | |
259 | /* | |
260 | * If we have only sent part of an SMB then the next SMB could | |
261 | * be taken as the remainder of this one. We need to kill the | |
262 | * socket so the server throws away the partial SMB | |
263 | */ | |
edf1ae40 SF |
264 | server->tcpStatus = CifsNeedReconnect; |
265 | } | |
266 | ||
d804d41d | 267 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 268 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 269 | else |
1da177e4 | 270 | rc = 0; |
1da177e4 LT |
271 | |
272 | return rc; | |
273 | } | |
274 | ||
6f49f46b JL |
275 | static int |
276 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) | |
277 | { | |
278 | struct smb_rqst rqst = { .rq_iov = iov, | |
279 | .rq_nvec = n_vec }; | |
280 | ||
281 | return smb_send_rqst(server, &rqst); | |
282 | } | |
283 | ||
0496e02d JL |
284 | int |
285 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
286 | unsigned int smb_buf_length) | |
287 | { | |
288 | struct kvec iov; | |
289 | ||
290 | iov.iov_base = smb_buffer; | |
291 | iov.iov_len = smb_buf_length + 4; | |
292 | ||
293 | return smb_sendv(server, &iov, 1); | |
294 | } | |
295 | ||
fc40f9cf | 296 | static int |
a891f0f8 | 297 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 298 | int *credits) |
1da177e4 | 299 | { |
5bc59498 PS |
300 | int rc; |
301 | ||
fc40f9cf | 302 | spin_lock(&server->req_lock); |
a891f0f8 | 303 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 304 | /* oplock breaks must not be held up */ |
fc40f9cf | 305 | server->in_flight++; |
bc205ed1 | 306 | *credits -= 1; |
fc40f9cf | 307 | spin_unlock(&server->req_lock); |
27a97a61 VL |
308 | return 0; |
309 | } | |
310 | ||
27a97a61 | 311 | while (1) { |
bc205ed1 | 312 | if (*credits <= 0) { |
fc40f9cf | 313 | spin_unlock(&server->req_lock); |
789e6661 | 314 | cifs_num_waiters_inc(server); |
5bc59498 | 315 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 316 | has_credits(server, credits)); |
789e6661 | 317 | cifs_num_waiters_dec(server); |
5bc59498 PS |
318 | if (rc) |
319 | return rc; | |
fc40f9cf | 320 | spin_lock(&server->req_lock); |
27a97a61 | 321 | } else { |
c5797a94 | 322 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 323 | spin_unlock(&server->req_lock); |
27a97a61 | 324 | return -ENOENT; |
1da177e4 | 325 | } |
27a97a61 | 326 | |
2d86dbc9 PS |
327 | /* |
328 | * Can not count locking commands against total | |
329 | * as they are allowed to block on server. | |
330 | */ | |
27a97a61 VL |
331 | |
332 | /* update # of requests on the wire to server */ | |
a891f0f8 | 333 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 334 | *credits -= 1; |
fc40f9cf | 335 | server->in_flight++; |
2d86dbc9 | 336 | } |
fc40f9cf | 337 | spin_unlock(&server->req_lock); |
27a97a61 | 338 | break; |
1da177e4 LT |
339 | } |
340 | } | |
7ee1af76 JA |
341 | return 0; |
342 | } | |
1da177e4 | 343 | |
bc205ed1 | 344 | static int |
a891f0f8 PS |
345 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
346 | const int optype) | |
bc205ed1 | 347 | { |
a891f0f8 PS |
348 | return wait_for_free_credits(server, timeout, |
349 | server->ops->get_credits_field(server, optype)); | |
bc205ed1 PS |
350 | } |
351 | ||
96daf2b0 | 352 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
353 | struct mid_q_entry **ppmidQ) |
354 | { | |
1da177e4 | 355 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 356 | return -ENOENT; |
8fbbd365 VL |
357 | } |
358 | ||
359 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 360 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 361 | return -EAGAIN; |
8fbbd365 VL |
362 | } |
363 | ||
364 | if (ses->status != CifsGood) { | |
1da177e4 | 365 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 366 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 367 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 368 | return -EAGAIN; |
ad7a2926 | 369 | /* else ok - we are setting up session */ |
1da177e4 | 370 | } |
24b9b06b | 371 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 372 | if (*ppmidQ == NULL) |
7ee1af76 | 373 | return -ENOMEM; |
ddc8cf8f JL |
374 | spin_lock(&GlobalMid_Lock); |
375 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
376 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
377 | return 0; |
378 | } | |
379 | ||
0ade640e JL |
380 | static int |
381 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 382 | { |
0ade640e | 383 | int error; |
7ee1af76 | 384 | |
f06ac72e | 385 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 386 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
387 | if (error < 0) |
388 | return -ERESTARTSYS; | |
7ee1af76 | 389 | |
0ade640e | 390 | return 0; |
7ee1af76 JA |
391 | } |
392 | ||
45740847 | 393 | int |
792af7b0 PS |
394 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, |
395 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
396 | { | |
397 | int rc; | |
398 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
399 | struct mid_q_entry *mid; | |
400 | ||
401 | /* enable signing if server requires it */ | |
402 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
403 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
404 | ||
405 | mid = AllocMidQEntry(hdr, server); | |
406 | if (mid == NULL) | |
407 | return -ENOMEM; | |
408 | ||
762a4206 | 409 | rc = cifs_sign_smbv(iov, nvec, server, &mid->sequence_number); |
ffc61ccb SP |
410 | if (rc) { |
411 | DeleteMidQEntry(mid); | |
412 | return rc; | |
413 | } | |
414 | ||
792af7b0 | 415 | *ret_mid = mid; |
ffc61ccb | 416 | return 0; |
792af7b0 | 417 | } |
133672ef | 418 | |
a6827c18 JL |
419 | /* |
420 | * Send a SMB request and set the callback function in the mid to handle | |
421 | * the result. Caller is responsible for dealing with timeouts. | |
422 | */ | |
423 | int | |
fcc31cb6 | 424 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 | 425 | unsigned int nvec, mid_receive_t *receive, |
a891f0f8 | 426 | mid_callback_t *callback, void *cbdata, const int flags) |
a6827c18 | 427 | { |
a891f0f8 | 428 | int rc, timeout, optype; |
a6827c18 JL |
429 | struct mid_q_entry *mid; |
430 | ||
a891f0f8 PS |
431 | timeout = flags & CIFS_TIMEOUT_MASK; |
432 | optype = flags & CIFS_OP_MASK; | |
433 | ||
434 | rc = wait_for_free_request(server, timeout, optype); | |
a6827c18 JL |
435 | if (rc) |
436 | return rc; | |
437 | ||
438 | mutex_lock(&server->srv_mutex); | |
45740847 | 439 | rc = server->ops->setup_async_request(server, iov, nvec, &mid); |
792af7b0 | 440 | if (rc) { |
a6827c18 | 441 | mutex_unlock(&server->srv_mutex); |
a891f0f8 | 442 | add_credits(server, 1, optype); |
0193e072 | 443 | wake_up(&server->request_q); |
792af7b0 | 444 | return rc; |
a6827c18 JL |
445 | } |
446 | ||
44d22d84 | 447 | mid->receive = receive; |
a6827c18 JL |
448 | mid->callback = callback; |
449 | mid->callback_data = cbdata; | |
7c9421e1 | 450 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 451 | |
ffc61ccb SP |
452 | /* put it on the pending_mid_q */ |
453 | spin_lock(&GlobalMid_Lock); | |
454 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
455 | spin_unlock(&GlobalMid_Lock); | |
456 | ||
457 | ||
789e6661 | 458 | cifs_in_send_inc(server); |
fcc31cb6 | 459 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
460 | cifs_in_send_dec(server); |
461 | cifs_save_when_sent(mid); | |
a6827c18 | 462 | mutex_unlock(&server->srv_mutex); |
789e6661 | 463 | |
ffc61ccb SP |
464 | if (rc == 0) |
465 | return 0; | |
a6827c18 | 466 | |
3c1bf7e4 | 467 | cifs_delete_mid(mid); |
a891f0f8 | 468 | add_credits(server, 1, optype); |
a6827c18 JL |
469 | wake_up(&server->request_q); |
470 | return rc; | |
471 | } | |
472 | ||
133672ef SF |
473 | /* |
474 | * | |
475 | * Send an SMB Request. No response info (other than return code) | |
476 | * needs to be parsed. | |
477 | * | |
478 | * flags indicate the type of request buffer and how long to wait | |
479 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
480 | * | |
481 | */ | |
482 | int | |
96daf2b0 | 483 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 484 | char *in_buf, int flags) |
133672ef SF |
485 | { |
486 | int rc; | |
487 | struct kvec iov[1]; | |
488 | int resp_buf_type; | |
489 | ||
792af7b0 PS |
490 | iov[0].iov_base = in_buf; |
491 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
492 | flags |= CIFS_NO_RESP; |
493 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 494 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 495 | |
133672ef SF |
496 | return rc; |
497 | } | |
498 | ||
053d5034 | 499 | static int |
3c1105df | 500 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
501 | { |
502 | int rc = 0; | |
503 | ||
7c9421e1 PS |
504 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
505 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 506 | |
74dd92a8 | 507 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 508 | switch (mid->mid_state) { |
74dd92a8 | 509 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
510 | spin_unlock(&GlobalMid_Lock); |
511 | return rc; | |
74dd92a8 JL |
512 | case MID_RETRY_NEEDED: |
513 | rc = -EAGAIN; | |
514 | break; | |
71823baf JL |
515 | case MID_RESPONSE_MALFORMED: |
516 | rc = -EIO; | |
517 | break; | |
3c1105df JL |
518 | case MID_SHUTDOWN: |
519 | rc = -EHOSTDOWN; | |
520 | break; | |
74dd92a8 | 521 | default: |
3c1105df | 522 | list_del_init(&mid->qhead); |
7c9421e1 PS |
523 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
524 | mid->mid, mid->mid_state); | |
74dd92a8 | 525 | rc = -EIO; |
053d5034 JL |
526 | } |
527 | spin_unlock(&GlobalMid_Lock); | |
528 | ||
2b84a36c | 529 | DeleteMidQEntry(mid); |
053d5034 JL |
530 | return rc; |
531 | } | |
532 | ||
121b046a JL |
533 | static inline int |
534 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 535 | { |
121b046a JL |
536 | return server->ops->send_cancel ? |
537 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
538 | } |
539 | ||
2c8f981d JL |
540 | int |
541 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
542 | bool log_error) | |
543 | { | |
792af7b0 | 544 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
545 | |
546 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
547 | |
548 | /* convert the length into a more usable form */ | |
96daf2b0 | 549 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 | 550 | struct kvec iov; |
985e4ff0 | 551 | int rc = 0; |
bf5ea0e2 JL |
552 | struct smb_rqst rqst = { .rq_iov = &iov, |
553 | .rq_nvec = 1 }; | |
826a95e4 JL |
554 | |
555 | iov.iov_base = mid->resp_buf; | |
556 | iov.iov_len = len; | |
2c8f981d | 557 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 558 | rc = cifs_verify_signature(&rqst, server, |
985e4ff0 SF |
559 | mid->sequence_number + 1); |
560 | if (rc) | |
561 | cERROR(1, "SMB signature verification returned error = " | |
562 | "%d", rc); | |
2c8f981d JL |
563 | } |
564 | ||
565 | /* BB special case reconnect tid and uid here? */ | |
566 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
567 | } | |
568 | ||
082d0642 | 569 | int |
792af7b0 PS |
570 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, |
571 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
572 | { | |
573 | int rc; | |
574 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
575 | struct mid_q_entry *mid; | |
576 | ||
577 | rc = allocate_mid(ses, hdr, &mid); | |
578 | if (rc) | |
579 | return rc; | |
762a4206 | 580 | rc = cifs_sign_smbv(iov, nvec, ses->server, &mid->sequence_number); |
792af7b0 | 581 | if (rc) |
3c1bf7e4 | 582 | cifs_delete_mid(mid); |
792af7b0 PS |
583 | *ret_mid = mid; |
584 | return rc; | |
585 | } | |
586 | ||
7ee1af76 | 587 | int |
96daf2b0 | 588 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
a891f0f8 | 589 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
133672ef | 590 | const int flags) |
7ee1af76 JA |
591 | { |
592 | int rc = 0; | |
a891f0f8 | 593 | int timeout, optype; |
7ee1af76 | 594 | struct mid_q_entry *midQ; |
792af7b0 | 595 | char *buf = iov[0].iov_base; |
a891f0f8 | 596 | unsigned int credits = 1; |
50c2f753 | 597 | |
a891f0f8 PS |
598 | timeout = flags & CIFS_TIMEOUT_MASK; |
599 | optype = flags & CIFS_OP_MASK; | |
133672ef | 600 | |
a891f0f8 | 601 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
602 | |
603 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 604 | cifs_small_buf_release(buf); |
b6b38f70 | 605 | cERROR(1, "Null session"); |
7ee1af76 JA |
606 | return -EIO; |
607 | } | |
608 | ||
79a58d1f | 609 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 610 | cifs_small_buf_release(buf); |
7ee1af76 JA |
611 | return -ENOENT; |
612 | } | |
613 | ||
792af7b0 PS |
614 | /* |
615 | * Ensure that we do not send more than 50 overlapping requests | |
616 | * to the same server. We may make this configurable later or | |
617 | * use ses->maxReq. | |
618 | */ | |
7ee1af76 | 619 | |
a891f0f8 | 620 | rc = wait_for_free_request(ses->server, timeout, optype); |
7ee1af76 | 621 | if (rc) { |
792af7b0 | 622 | cifs_small_buf_release(buf); |
7ee1af76 JA |
623 | return rc; |
624 | } | |
625 | ||
792af7b0 PS |
626 | /* |
627 | * Make sure that we sign in the same order that we send on this socket | |
628 | * and avoid races inside tcp sendmsg code that could cause corruption | |
629 | * of smb data. | |
630 | */ | |
7ee1af76 | 631 | |
72ca545b | 632 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 633 | |
082d0642 | 634 | rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ); |
7ee1af76 | 635 | if (rc) { |
72ca545b | 636 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 637 | cifs_small_buf_release(buf); |
7ee1af76 | 638 | /* Update # of requests on wire to server */ |
a891f0f8 | 639 | add_credits(ses->server, 1, optype); |
7ee1af76 | 640 | return rc; |
1da177e4 | 641 | } |
1da177e4 | 642 | |
7c9421e1 | 643 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 644 | cifs_in_send_inc(ses->server); |
0496e02d | 645 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
646 | cifs_in_send_dec(ses->server); |
647 | cifs_save_when_sent(midQ); | |
7ee1af76 | 648 | |
72ca545b | 649 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 650 | |
2db7c581 | 651 | if (rc < 0) { |
792af7b0 | 652 | cifs_small_buf_release(buf); |
7ee1af76 | 653 | goto out; |
2db7c581 | 654 | } |
4b8f930f | 655 | |
a891f0f8 | 656 | if (timeout == CIFS_ASYNC_OP) { |
792af7b0 | 657 | cifs_small_buf_release(buf); |
133672ef | 658 | goto out; |
2db7c581 | 659 | } |
d6e04ae6 | 660 | |
0ade640e | 661 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 662 | if (rc != 0) { |
121b046a | 663 | send_cancel(ses->server, buf, midQ); |
1be912dd | 664 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 665 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
666 | midQ->callback = DeleteMidQEntry; |
667 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 668 | cifs_small_buf_release(buf); |
a891f0f8 | 669 | add_credits(ses->server, 1, optype); |
1be912dd JL |
670 | return rc; |
671 | } | |
672 | spin_unlock(&GlobalMid_Lock); | |
673 | } | |
d6e04ae6 | 674 | |
792af7b0 | 675 | cifs_small_buf_release(buf); |
2db7c581 | 676 | |
3c1105df | 677 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 678 | if (rc != 0) { |
a891f0f8 | 679 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
680 | return rc; |
681 | } | |
50c2f753 | 682 | |
7c9421e1 | 683 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 684 | rc = -EIO; |
2c8f981d | 685 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
686 | goto out; |
687 | } | |
688 | ||
792af7b0 PS |
689 | buf = (char *)midQ->resp_buf; |
690 | iov[0].iov_base = buf; | |
691 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 692 | if (midQ->large_buf) |
a891f0f8 | 693 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 694 | else |
a891f0f8 PS |
695 | *resp_buf_type = CIFS_SMALL_BUFFER; |
696 | ||
697 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 698 | |
082d0642 PS |
699 | rc = ses->server->ops->check_receive(midQ, ses->server, |
700 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 701 | |
3c1bf7e4 | 702 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
703 | if ((flags & CIFS_NO_RESP) == 0) |
704 | midQ->resp_buf = NULL; | |
7ee1af76 | 705 | out: |
3c1bf7e4 | 706 | cifs_delete_mid(midQ); |
a891f0f8 | 707 | add_credits(ses->server, credits, optype); |
1da177e4 | 708 | |
d6e04ae6 SF |
709 | return rc; |
710 | } | |
1da177e4 LT |
711 | |
712 | int | |
96daf2b0 | 713 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 714 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 715 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
716 | { |
717 | int rc = 0; | |
1da177e4 LT |
718 | struct mid_q_entry *midQ; |
719 | ||
720 | if (ses == NULL) { | |
b6b38f70 | 721 | cERROR(1, "Null smb session"); |
1da177e4 LT |
722 | return -EIO; |
723 | } | |
79a58d1f | 724 | if (ses->server == NULL) { |
b6b38f70 | 725 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
726 | return -EIO; |
727 | } | |
728 | ||
79a58d1f | 729 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
730 | return -ENOENT; |
731 | ||
79a58d1f | 732 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
733 | to the same server. We may make this configurable later or |
734 | use ses->maxReq */ | |
1da177e4 | 735 | |
be8e3b00 SF |
736 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
737 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 738 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 739 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
740 | return -EIO; |
741 | } | |
742 | ||
a891f0f8 | 743 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
744 | if (rc) |
745 | return rc; | |
746 | ||
79a58d1f | 747 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
748 | and avoid races inside tcp sendmsg code that could cause corruption |
749 | of smb data */ | |
750 | ||
72ca545b | 751 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 752 | |
7ee1af76 JA |
753 | rc = allocate_mid(ses, in_buf, &midQ); |
754 | if (rc) { | |
72ca545b | 755 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 756 | /* Update # of requests on wire to server */ |
a891f0f8 | 757 | add_credits(ses->server, 1, 0); |
7ee1af76 | 758 | return rc; |
1da177e4 LT |
759 | } |
760 | ||
ad009ac9 | 761 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
762 | if (rc) { |
763 | mutex_unlock(&ses->server->srv_mutex); | |
764 | goto out; | |
765 | } | |
1da177e4 | 766 | |
7c9421e1 | 767 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
768 | |
769 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 770 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
771 | cifs_in_send_dec(ses->server); |
772 | cifs_save_when_sent(midQ); | |
72ca545b | 773 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 774 | |
79a58d1f | 775 | if (rc < 0) |
7ee1af76 JA |
776 | goto out; |
777 | ||
a891f0f8 | 778 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 779 | goto out; |
1da177e4 | 780 | |
0ade640e | 781 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 782 | if (rc != 0) { |
121b046a | 783 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 784 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 785 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
786 | /* no longer considered to be "in-flight" */ |
787 | midQ->callback = DeleteMidQEntry; | |
788 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 789 | add_credits(ses->server, 1, 0); |
1be912dd JL |
790 | return rc; |
791 | } | |
792 | spin_unlock(&GlobalMid_Lock); | |
793 | } | |
1da177e4 | 794 | |
3c1105df | 795 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 796 | if (rc != 0) { |
a891f0f8 | 797 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
798 | return rc; |
799 | } | |
50c2f753 | 800 | |
2c8f981d | 801 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 802 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 803 | rc = -EIO; |
b6b38f70 | 804 | cERROR(1, "Bad MID state?"); |
2c8f981d | 805 | goto out; |
1da177e4 | 806 | } |
7ee1af76 | 807 | |
d4e4854f | 808 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
809 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
810 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 811 | out: |
3c1bf7e4 | 812 | cifs_delete_mid(midQ); |
a891f0f8 | 813 | add_credits(ses->server, 1, 0); |
1da177e4 | 814 | |
7ee1af76 JA |
815 | return rc; |
816 | } | |
1da177e4 | 817 | |
7ee1af76 JA |
818 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
819 | blocking lock to return. */ | |
820 | ||
821 | static int | |
96daf2b0 | 822 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
823 | struct smb_hdr *in_buf, |
824 | struct smb_hdr *out_buf) | |
825 | { | |
826 | int bytes_returned; | |
96daf2b0 | 827 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
828 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
829 | ||
830 | /* We just modify the current in_buf to change | |
831 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
832 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
833 | LOCKING_ANDX_CANCEL_LOCK. */ | |
834 | ||
835 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
836 | pSMB->Timeout = 0; | |
88257360 | 837 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
838 | |
839 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 840 | &bytes_returned, 0); |
7ee1af76 JA |
841 | } |
842 | ||
843 | int | |
96daf2b0 | 844 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
845 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
846 | int *pbytes_returned) | |
847 | { | |
848 | int rc = 0; | |
849 | int rstart = 0; | |
7ee1af76 | 850 | struct mid_q_entry *midQ; |
96daf2b0 | 851 | struct cifs_ses *ses; |
7ee1af76 JA |
852 | |
853 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 854 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
855 | return -EIO; |
856 | } | |
857 | ses = tcon->ses; | |
858 | ||
79a58d1f | 859 | if (ses->server == NULL) { |
b6b38f70 | 860 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
861 | return -EIO; |
862 | } | |
863 | ||
79a58d1f | 864 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
865 | return -ENOENT; |
866 | ||
79a58d1f | 867 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
868 | to the same server. We may make this configurable later or |
869 | use ses->maxReq */ | |
870 | ||
be8e3b00 SF |
871 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
872 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 873 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 874 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
875 | return -EIO; |
876 | } | |
877 | ||
a891f0f8 | 878 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
879 | if (rc) |
880 | return rc; | |
881 | ||
79a58d1f | 882 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
883 | and avoid races inside tcp sendmsg code that could cause corruption |
884 | of smb data */ | |
885 | ||
72ca545b | 886 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
887 | |
888 | rc = allocate_mid(ses, in_buf, &midQ); | |
889 | if (rc) { | |
72ca545b | 890 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
891 | return rc; |
892 | } | |
893 | ||
7ee1af76 | 894 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 895 | if (rc) { |
3c1bf7e4 | 896 | cifs_delete_mid(midQ); |
829049cb VL |
897 | mutex_unlock(&ses->server->srv_mutex); |
898 | return rc; | |
899 | } | |
1da177e4 | 900 | |
7c9421e1 | 901 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 902 | cifs_in_send_inc(ses->server); |
be8e3b00 | 903 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
904 | cifs_in_send_dec(ses->server); |
905 | cifs_save_when_sent(midQ); | |
72ca545b | 906 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 907 | |
79a58d1f | 908 | if (rc < 0) { |
3c1bf7e4 | 909 | cifs_delete_mid(midQ); |
7ee1af76 JA |
910 | return rc; |
911 | } | |
912 | ||
913 | /* Wait for a reply - allow signals to interrupt. */ | |
914 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 915 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
916 | ((ses->server->tcpStatus != CifsGood) && |
917 | (ses->server->tcpStatus != CifsNew))); | |
918 | ||
919 | /* Were we interrupted by a signal ? */ | |
920 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 921 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
922 | ((ses->server->tcpStatus == CifsGood) || |
923 | (ses->server->tcpStatus == CifsNew))) { | |
924 | ||
925 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
926 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
927 | blocking lock to return. */ | |
121b046a | 928 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 929 | if (rc) { |
3c1bf7e4 | 930 | cifs_delete_mid(midQ); |
7ee1af76 JA |
931 | return rc; |
932 | } | |
933 | } else { | |
934 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
935 | to cause the blocking lock to return. */ | |
936 | ||
937 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
938 | ||
939 | /* If we get -ENOLCK back the lock may have | |
940 | already been removed. Don't exit in this case. */ | |
941 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 942 | cifs_delete_mid(midQ); |
7ee1af76 JA |
943 | return rc; |
944 | } | |
945 | } | |
946 | ||
1be912dd JL |
947 | rc = wait_for_response(ses->server, midQ); |
948 | if (rc) { | |
121b046a | 949 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 950 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 951 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
952 | /* no longer considered to be "in-flight" */ |
953 | midQ->callback = DeleteMidQEntry; | |
954 | spin_unlock(&GlobalMid_Lock); | |
955 | return rc; | |
956 | } | |
957 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 958 | } |
1be912dd JL |
959 | |
960 | /* We got the response - restart system call. */ | |
961 | rstart = 1; | |
7ee1af76 JA |
962 | } |
963 | ||
3c1105df | 964 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 965 | if (rc != 0) |
7ee1af76 | 966 | return rc; |
50c2f753 | 967 | |
17c8bfed | 968 | /* rcvd frame is ok */ |
7c9421e1 | 969 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 970 | rc = -EIO; |
b6b38f70 | 971 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
972 | goto out; |
973 | } | |
1da177e4 | 974 | |
d4e4854f | 975 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
976 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
977 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 978 | out: |
3c1bf7e4 | 979 | cifs_delete_mid(midQ); |
7ee1af76 JA |
980 | if (rstart && rc == -EACCES) |
981 | return -ERESTARTSYS; | |
1da177e4 LT |
982 | return rc; |
983 | } |