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Commit | Line | Data |
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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> | |
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> |
b8eed283 | 30 | #include <linux/tcp.h> |
97bc00b3 | 31 | #include <linux/highmem.h> |
1da177e4 LT |
32 | #include <asm/uaccess.h> |
33 | #include <asm/processor.h> | |
34 | #include <linux/mempool.h> | |
35 | #include "cifspdu.h" | |
36 | #include "cifsglob.h" | |
37 | #include "cifsproto.h" | |
38 | #include "cifs_debug.h" | |
50c2f753 | 39 | |
2dc7e1c0 PS |
40 | void |
41 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
42 | { |
43 | wake_up_process(mid->callback_data); | |
44 | } | |
45 | ||
a6827c18 | 46 | struct mid_q_entry * |
24b9b06b | 47 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
48 | { |
49 | struct mid_q_entry *temp; | |
50 | ||
24b9b06b | 51 | if (server == NULL) { |
b6b38f70 | 52 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
53 | return NULL; |
54 | } | |
50c2f753 | 55 | |
232087cb | 56 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
57 | if (temp == NULL) |
58 | return temp; | |
59 | else { | |
26f57364 | 60 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
61 | temp->mid = smb_buffer->Mid; /* always LE */ |
62 | temp->pid = current->pid; | |
7c9421e1 PS |
63 | temp->command = cpu_to_le16(smb_buffer->Command); |
64 | cFYI(1, "For smb_command %d", smb_buffer->Command); | |
1047abc1 SF |
65 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
66 | /* when mid allocated can be before when sent */ | |
67 | temp->when_alloc = jiffies; | |
2dc7e1c0 | 68 | temp->server = server; |
2b84a36c JL |
69 | |
70 | /* | |
71 | * The default is for the mid to be synchronous, so the | |
72 | * default callback just wakes up the current task. | |
73 | */ | |
2dc7e1c0 | 74 | temp->callback = cifs_wake_up_task; |
2b84a36c | 75 | temp->callback_data = current; |
1da177e4 LT |
76 | } |
77 | ||
1da177e4 | 78 | atomic_inc(&midCount); |
7c9421e1 | 79 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
80 | return temp; |
81 | } | |
82 | ||
766fdbb5 | 83 | void |
1da177e4 LT |
84 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
85 | { | |
1047abc1 | 86 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 87 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
88 | unsigned long now; |
89 | #endif | |
7c9421e1 | 90 | midEntry->mid_state = MID_FREE; |
8097531a | 91 | atomic_dec(&midCount); |
7c9421e1 | 92 | if (midEntry->large_buf) |
b8643e1b SF |
93 | cifs_buf_release(midEntry->resp_buf); |
94 | else | |
95 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
96 | #ifdef CONFIG_CIFS_STATS2 |
97 | now = jiffies; | |
98 | /* commands taking longer than one second are indications that | |
99 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f | 100 | if ((now - midEntry->when_alloc) > HZ) { |
2dc7e1c0 | 101 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
7c9421e1 | 102 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", |
1047abc1 SF |
103 | midEntry->command, midEntry->mid); |
104 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
105 | now - midEntry->when_alloc, | |
106 | now - midEntry->when_sent, | |
107 | now - midEntry->when_received); | |
108 | } | |
109 | } | |
110 | #endif | |
1da177e4 LT |
111 | mempool_free(midEntry, cifs_mid_poolp); |
112 | } | |
113 | ||
3c1bf7e4 PS |
114 | void |
115 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
116 | { |
117 | spin_lock(&GlobalMid_Lock); | |
118 | list_del(&mid->qhead); | |
119 | spin_unlock(&GlobalMid_Lock); | |
120 | ||
121 | DeleteMidQEntry(mid); | |
122 | } | |
123 | ||
6f49f46b JL |
124 | /* |
125 | * smb_send_kvec - send an array of kvecs to the server | |
126 | * @server: Server to send the data to | |
127 | * @iov: Pointer to array of kvecs | |
128 | * @n_vec: length of kvec array | |
129 | * @sent: amount of data sent on socket is stored here | |
130 | * | |
131 | * Our basic "send data to server" function. Should be called with srv_mutex | |
132 | * held. The caller is responsible for handling the results. | |
133 | */ | |
d6e04ae6 | 134 | static int |
6f49f46b JL |
135 | smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec, |
136 | size_t *sent) | |
1da177e4 LT |
137 | { |
138 | int rc = 0; | |
139 | int i = 0; | |
140 | struct msghdr smb_msg; | |
6f49f46b JL |
141 | unsigned int remaining; |
142 | size_t first_vec = 0; | |
edf1ae40 | 143 | struct socket *ssocket = server->ssocket; |
50c2f753 | 144 | |
6f49f46b JL |
145 | *sent = 0; |
146 | ||
79a58d1f | 147 | if (ssocket == NULL) |
1da177e4 | 148 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 149 | |
a9f1b85e | 150 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 151 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
152 | smb_msg.msg_control = NULL; |
153 | smb_msg.msg_controllen = 0; | |
0496e02d | 154 | if (server->noblocksnd) |
edf1ae40 SF |
155 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
156 | else | |
157 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 158 | |
6f49f46b | 159 | remaining = 0; |
3e84469d | 160 | for (i = 0; i < n_vec; i++) |
6f49f46b | 161 | remaining += iov[i].iov_len; |
1da177e4 | 162 | |
17680356 | 163 | i = 0; |
6f49f46b JL |
164 | while (remaining) { |
165 | /* | |
166 | * If blocking send, we try 3 times, since each can block | |
167 | * for 5 seconds. For nonblocking we have to try more | |
168 | * but wait increasing amounts of time allowing time for | |
169 | * socket to clear. The overall time we wait in either | |
170 | * case to send on the socket is about 15 seconds. | |
171 | * Similarly we wait for 15 seconds for a response from | |
172 | * the server in SendReceive[2] for the server to send | |
173 | * a response back for most types of requests (except | |
174 | * SMB Write past end of file which can be slow, and | |
175 | * blocking lock operations). NFS waits slightly longer | |
176 | * than CIFS, but this can make it take longer for | |
177 | * nonresponsive servers to be detected and 15 seconds | |
178 | * is more than enough time for modern networks to | |
179 | * send a packet. In most cases if we fail to send | |
180 | * after the retries we will kill the socket and | |
181 | * reconnect which may clear the network problem. | |
182 | */ | |
3e84469d | 183 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
6f49f46b JL |
184 | n_vec - first_vec, remaining); |
185 | if (rc == -ENOSPC || rc == -EAGAIN) { | |
1da177e4 | 186 | i++; |
6f49f46b JL |
187 | if (i >= 14 || (!server->noblocksnd && (i > 2))) { |
188 | cERROR(1, "sends on sock %p stuck for 15 " | |
189 | "seconds", ssocket); | |
1da177e4 LT |
190 | rc = -EAGAIN; |
191 | break; | |
192 | } | |
68058e75 | 193 | msleep(1 << i); |
1da177e4 LT |
194 | continue; |
195 | } | |
6f49f46b | 196 | |
79a58d1f | 197 | if (rc < 0) |
1da177e4 | 198 | break; |
3e84469d | 199 | |
6f49f46b JL |
200 | /* send was at least partially successful */ |
201 | *sent += rc; | |
202 | ||
203 | if (rc == remaining) { | |
204 | remaining = 0; | |
61de800d | 205 | break; |
6f49f46b JL |
206 | } |
207 | ||
208 | if (rc > remaining) { | |
209 | cERROR(1, "sent %d requested %d", rc, remaining); | |
3e84469d SF |
210 | break; |
211 | } | |
6f49f46b | 212 | |
79a58d1f | 213 | if (rc == 0) { |
3e84469d SF |
214 | /* should never happen, letting socket clear before |
215 | retrying is our only obvious option here */ | |
b6b38f70 | 216 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
217 | msleep(500); |
218 | continue; | |
d6e04ae6 | 219 | } |
6f49f46b JL |
220 | |
221 | remaining -= rc; | |
222 | ||
68058e75 | 223 | /* the line below resets i */ |
3e84469d SF |
224 | for (i = first_vec; i < n_vec; i++) { |
225 | if (iov[i].iov_len) { | |
226 | if (rc > iov[i].iov_len) { | |
227 | rc -= iov[i].iov_len; | |
228 | iov[i].iov_len = 0; | |
229 | } else { | |
230 | iov[i].iov_base += rc; | |
231 | iov[i].iov_len -= rc; | |
232 | first_vec = i; | |
233 | break; | |
234 | } | |
235 | } | |
d6e04ae6 | 236 | } |
6f49f46b | 237 | |
5e1253b5 | 238 | i = 0; /* in case we get ENOSPC on the next send */ |
6f49f46b | 239 | rc = 0; |
1da177e4 | 240 | } |
6f49f46b JL |
241 | return rc; |
242 | } | |
243 | ||
97bc00b3 JL |
244 | /** |
245 | * rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec | |
246 | * @rqst: pointer to smb_rqst | |
247 | * @idx: index into the array of the page | |
248 | * @iov: pointer to struct kvec that will hold the result | |
249 | * | |
250 | * Helper function to convert a slot in the rqst->rq_pages array into a kvec. | |
251 | * The page will be kmapped and the address placed into iov_base. The length | |
252 | * will then be adjusted according to the ptailoff. | |
253 | */ | |
fb308a6f | 254 | void |
97bc00b3 JL |
255 | cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx, |
256 | struct kvec *iov) | |
257 | { | |
258 | /* | |
259 | * FIXME: We could avoid this kmap altogether if we used | |
260 | * kernel_sendpage instead of kernel_sendmsg. That will only | |
261 | * work if signing is disabled though as sendpage inlines the | |
262 | * page directly into the fraglist. If userspace modifies the | |
263 | * page after we calculate the signature, then the server will | |
264 | * reject it and may break the connection. kernel_sendmsg does | |
265 | * an extra copy of the data and avoids that issue. | |
266 | */ | |
267 | iov->iov_base = kmap(rqst->rq_pages[idx]); | |
268 | ||
269 | /* if last page, don't send beyond this offset into page */ | |
270 | if (idx == (rqst->rq_npages - 1)) | |
271 | iov->iov_len = rqst->rq_tailsz; | |
272 | else | |
273 | iov->iov_len = rqst->rq_pagesz; | |
274 | } | |
275 | ||
6f49f46b JL |
276 | static int |
277 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
278 | { | |
279 | int rc; | |
280 | struct kvec *iov = rqst->rq_iov; | |
281 | int n_vec = rqst->rq_nvec; | |
282 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
97bc00b3 JL |
283 | unsigned int i; |
284 | size_t total_len = 0, sent; | |
b8eed283 JL |
285 | struct socket *ssocket = server->ssocket; |
286 | int val = 1; | |
6f49f46b JL |
287 | |
288 | cFYI(1, "Sending smb: smb_len=%u", smb_buf_length); | |
289 | dump_smb(iov[0].iov_base, iov[0].iov_len); | |
290 | ||
b8eed283 JL |
291 | /* cork the socket */ |
292 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
293 | (char *)&val, sizeof(val)); | |
294 | ||
97bc00b3 JL |
295 | rc = smb_send_kvec(server, iov, n_vec, &sent); |
296 | if (rc < 0) | |
297 | goto uncork; | |
298 | ||
299 | total_len += sent; | |
300 | ||
301 | /* now walk the page array and send each page in it */ | |
302 | for (i = 0; i < rqst->rq_npages; i++) { | |
303 | struct kvec p_iov; | |
304 | ||
305 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
306 | rc = smb_send_kvec(server, &p_iov, 1, &sent); | |
307 | kunmap(rqst->rq_pages[i]); | |
308 | if (rc < 0) | |
309 | break; | |
310 | ||
311 | total_len += sent; | |
312 | } | |
1da177e4 | 313 | |
97bc00b3 | 314 | uncork: |
b8eed283 JL |
315 | /* uncork it */ |
316 | val = 0; | |
317 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
318 | (char *)&val, sizeof(val)); | |
319 | ||
edf1ae40 | 320 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
6f49f46b JL |
321 | cFYI(1, "partial send (wanted=%u sent=%zu): terminating " |
322 | "session", smb_buf_length + 4, total_len); | |
323 | /* | |
324 | * If we have only sent part of an SMB then the next SMB could | |
325 | * be taken as the remainder of this one. We need to kill the | |
326 | * socket so the server throws away the partial SMB | |
327 | */ | |
edf1ae40 SF |
328 | server->tcpStatus = CifsNeedReconnect; |
329 | } | |
330 | ||
d804d41d | 331 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 332 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 333 | else |
1da177e4 | 334 | rc = 0; |
1da177e4 LT |
335 | |
336 | return rc; | |
337 | } | |
338 | ||
6f49f46b JL |
339 | static int |
340 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) | |
341 | { | |
342 | struct smb_rqst rqst = { .rq_iov = iov, | |
343 | .rq_nvec = n_vec }; | |
344 | ||
345 | return smb_send_rqst(server, &rqst); | |
346 | } | |
347 | ||
0496e02d JL |
348 | int |
349 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
350 | unsigned int smb_buf_length) | |
351 | { | |
352 | struct kvec iov; | |
353 | ||
354 | iov.iov_base = smb_buffer; | |
355 | iov.iov_len = smb_buf_length + 4; | |
356 | ||
357 | return smb_sendv(server, &iov, 1); | |
358 | } | |
359 | ||
fc40f9cf | 360 | static int |
a891f0f8 | 361 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 362 | int *credits) |
1da177e4 | 363 | { |
5bc59498 PS |
364 | int rc; |
365 | ||
fc40f9cf | 366 | spin_lock(&server->req_lock); |
a891f0f8 | 367 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 368 | /* oplock breaks must not be held up */ |
fc40f9cf | 369 | server->in_flight++; |
bc205ed1 | 370 | *credits -= 1; |
fc40f9cf | 371 | spin_unlock(&server->req_lock); |
27a97a61 VL |
372 | return 0; |
373 | } | |
374 | ||
27a97a61 | 375 | while (1) { |
bc205ed1 | 376 | if (*credits <= 0) { |
fc40f9cf | 377 | spin_unlock(&server->req_lock); |
789e6661 | 378 | cifs_num_waiters_inc(server); |
5bc59498 | 379 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 380 | has_credits(server, credits)); |
789e6661 | 381 | cifs_num_waiters_dec(server); |
5bc59498 PS |
382 | if (rc) |
383 | return rc; | |
fc40f9cf | 384 | spin_lock(&server->req_lock); |
27a97a61 | 385 | } else { |
c5797a94 | 386 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 387 | spin_unlock(&server->req_lock); |
27a97a61 | 388 | return -ENOENT; |
1da177e4 | 389 | } |
27a97a61 | 390 | |
2d86dbc9 PS |
391 | /* |
392 | * Can not count locking commands against total | |
393 | * as they are allowed to block on server. | |
394 | */ | |
27a97a61 VL |
395 | |
396 | /* update # of requests on the wire to server */ | |
a891f0f8 | 397 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 398 | *credits -= 1; |
fc40f9cf | 399 | server->in_flight++; |
2d86dbc9 | 400 | } |
fc40f9cf | 401 | spin_unlock(&server->req_lock); |
27a97a61 | 402 | break; |
1da177e4 LT |
403 | } |
404 | } | |
7ee1af76 JA |
405 | return 0; |
406 | } | |
1da177e4 | 407 | |
bc205ed1 | 408 | static int |
a891f0f8 PS |
409 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
410 | const int optype) | |
bc205ed1 | 411 | { |
a891f0f8 PS |
412 | return wait_for_free_credits(server, timeout, |
413 | server->ops->get_credits_field(server, optype)); | |
bc205ed1 PS |
414 | } |
415 | ||
96daf2b0 | 416 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
417 | struct mid_q_entry **ppmidQ) |
418 | { | |
1da177e4 | 419 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 420 | return -ENOENT; |
8fbbd365 VL |
421 | } |
422 | ||
423 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 424 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 425 | return -EAGAIN; |
8fbbd365 VL |
426 | } |
427 | ||
428 | if (ses->status != CifsGood) { | |
1da177e4 | 429 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 430 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 431 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 432 | return -EAGAIN; |
ad7a2926 | 433 | /* else ok - we are setting up session */ |
1da177e4 | 434 | } |
24b9b06b | 435 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 436 | if (*ppmidQ == NULL) |
7ee1af76 | 437 | return -ENOMEM; |
ddc8cf8f JL |
438 | spin_lock(&GlobalMid_Lock); |
439 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
440 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
441 | return 0; |
442 | } | |
443 | ||
0ade640e JL |
444 | static int |
445 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 446 | { |
0ade640e | 447 | int error; |
7ee1af76 | 448 | |
f06ac72e | 449 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 450 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
451 | if (error < 0) |
452 | return -ERESTARTSYS; | |
7ee1af76 | 453 | |
0ade640e | 454 | return 0; |
7ee1af76 JA |
455 | } |
456 | ||
fec344e3 JL |
457 | struct mid_q_entry * |
458 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
459 | { |
460 | int rc; | |
fec344e3 | 461 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
462 | struct mid_q_entry *mid; |
463 | ||
464 | /* enable signing if server requires it */ | |
465 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
466 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
467 | ||
468 | mid = AllocMidQEntry(hdr, server); | |
469 | if (mid == NULL) | |
fec344e3 | 470 | return ERR_PTR(-ENOMEM); |
792af7b0 | 471 | |
fec344e3 | 472 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
473 | if (rc) { |
474 | DeleteMidQEntry(mid); | |
fec344e3 | 475 | return ERR_PTR(rc); |
ffc61ccb SP |
476 | } |
477 | ||
fec344e3 | 478 | return mid; |
792af7b0 | 479 | } |
133672ef | 480 | |
a6827c18 JL |
481 | /* |
482 | * Send a SMB request and set the callback function in the mid to handle | |
483 | * the result. Caller is responsible for dealing with timeouts. | |
484 | */ | |
485 | int | |
fec344e3 JL |
486 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
487 | mid_receive_t *receive, mid_callback_t *callback, | |
488 | void *cbdata, const int flags) | |
a6827c18 | 489 | { |
a891f0f8 | 490 | int rc, timeout, optype; |
a6827c18 JL |
491 | struct mid_q_entry *mid; |
492 | ||
a891f0f8 PS |
493 | timeout = flags & CIFS_TIMEOUT_MASK; |
494 | optype = flags & CIFS_OP_MASK; | |
495 | ||
496 | rc = wait_for_free_request(server, timeout, optype); | |
a6827c18 JL |
497 | if (rc) |
498 | return rc; | |
499 | ||
500 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
501 | mid = server->ops->setup_async_request(server, rqst); |
502 | if (IS_ERR(mid)) { | |
a6827c18 | 503 | mutex_unlock(&server->srv_mutex); |
a891f0f8 | 504 | add_credits(server, 1, optype); |
0193e072 | 505 | wake_up(&server->request_q); |
fec344e3 | 506 | return PTR_ERR(mid); |
a6827c18 JL |
507 | } |
508 | ||
44d22d84 | 509 | mid->receive = receive; |
a6827c18 JL |
510 | mid->callback = callback; |
511 | mid->callback_data = cbdata; | |
7c9421e1 | 512 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 513 | |
ffc61ccb SP |
514 | /* put it on the pending_mid_q */ |
515 | spin_lock(&GlobalMid_Lock); | |
516 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
517 | spin_unlock(&GlobalMid_Lock); | |
518 | ||
519 | ||
789e6661 | 520 | cifs_in_send_inc(server); |
fec344e3 | 521 | rc = smb_send_rqst(server, rqst); |
789e6661 SF |
522 | cifs_in_send_dec(server); |
523 | cifs_save_when_sent(mid); | |
a6827c18 | 524 | mutex_unlock(&server->srv_mutex); |
789e6661 | 525 | |
ffc61ccb SP |
526 | if (rc == 0) |
527 | return 0; | |
a6827c18 | 528 | |
3c1bf7e4 | 529 | cifs_delete_mid(mid); |
a891f0f8 | 530 | add_credits(server, 1, optype); |
a6827c18 JL |
531 | wake_up(&server->request_q); |
532 | return rc; | |
533 | } | |
534 | ||
133672ef SF |
535 | /* |
536 | * | |
537 | * Send an SMB Request. No response info (other than return code) | |
538 | * needs to be parsed. | |
539 | * | |
540 | * flags indicate the type of request buffer and how long to wait | |
541 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
542 | * | |
543 | */ | |
544 | int | |
96daf2b0 | 545 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 546 | char *in_buf, int flags) |
133672ef SF |
547 | { |
548 | int rc; | |
549 | struct kvec iov[1]; | |
550 | int resp_buf_type; | |
551 | ||
792af7b0 PS |
552 | iov[0].iov_base = in_buf; |
553 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
554 | flags |= CIFS_NO_RESP; |
555 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 556 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 557 | |
133672ef SF |
558 | return rc; |
559 | } | |
560 | ||
053d5034 | 561 | static int |
3c1105df | 562 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
563 | { |
564 | int rc = 0; | |
565 | ||
7c9421e1 PS |
566 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
567 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 568 | |
74dd92a8 | 569 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 570 | switch (mid->mid_state) { |
74dd92a8 | 571 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
572 | spin_unlock(&GlobalMid_Lock); |
573 | return rc; | |
74dd92a8 JL |
574 | case MID_RETRY_NEEDED: |
575 | rc = -EAGAIN; | |
576 | break; | |
71823baf JL |
577 | case MID_RESPONSE_MALFORMED: |
578 | rc = -EIO; | |
579 | break; | |
3c1105df JL |
580 | case MID_SHUTDOWN: |
581 | rc = -EHOSTDOWN; | |
582 | break; | |
74dd92a8 | 583 | default: |
3c1105df | 584 | list_del_init(&mid->qhead); |
7c9421e1 PS |
585 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
586 | mid->mid, mid->mid_state); | |
74dd92a8 | 587 | rc = -EIO; |
053d5034 JL |
588 | } |
589 | spin_unlock(&GlobalMid_Lock); | |
590 | ||
2b84a36c | 591 | DeleteMidQEntry(mid); |
053d5034 JL |
592 | return rc; |
593 | } | |
594 | ||
121b046a JL |
595 | static inline int |
596 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 597 | { |
121b046a JL |
598 | return server->ops->send_cancel ? |
599 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
600 | } |
601 | ||
2c8f981d JL |
602 | int |
603 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
604 | bool log_error) | |
605 | { | |
792af7b0 | 606 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
607 | |
608 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
609 | |
610 | /* convert the length into a more usable form */ | |
96daf2b0 | 611 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 | 612 | struct kvec iov; |
985e4ff0 | 613 | int rc = 0; |
bf5ea0e2 JL |
614 | struct smb_rqst rqst = { .rq_iov = &iov, |
615 | .rq_nvec = 1 }; | |
826a95e4 JL |
616 | |
617 | iov.iov_base = mid->resp_buf; | |
618 | iov.iov_len = len; | |
2c8f981d | 619 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 620 | rc = cifs_verify_signature(&rqst, server, |
985e4ff0 SF |
621 | mid->sequence_number + 1); |
622 | if (rc) | |
623 | cERROR(1, "SMB signature verification returned error = " | |
624 | "%d", rc); | |
2c8f981d JL |
625 | } |
626 | ||
627 | /* BB special case reconnect tid and uid here? */ | |
628 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
629 | } | |
630 | ||
fec344e3 JL |
631 | struct mid_q_entry * |
632 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
633 | { |
634 | int rc; | |
fec344e3 | 635 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
636 | struct mid_q_entry *mid; |
637 | ||
638 | rc = allocate_mid(ses, hdr, &mid); | |
639 | if (rc) | |
fec344e3 JL |
640 | return ERR_PTR(rc); |
641 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
642 | if (rc) { | |
3c1bf7e4 | 643 | cifs_delete_mid(mid); |
fec344e3 JL |
644 | return ERR_PTR(rc); |
645 | } | |
646 | return mid; | |
792af7b0 PS |
647 | } |
648 | ||
7ee1af76 | 649 | int |
96daf2b0 | 650 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
a891f0f8 | 651 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
133672ef | 652 | const int flags) |
7ee1af76 JA |
653 | { |
654 | int rc = 0; | |
a891f0f8 | 655 | int timeout, optype; |
7ee1af76 | 656 | struct mid_q_entry *midQ; |
792af7b0 | 657 | char *buf = iov[0].iov_base; |
a891f0f8 | 658 | unsigned int credits = 1; |
fec344e3 JL |
659 | struct smb_rqst rqst = { .rq_iov = iov, |
660 | .rq_nvec = n_vec }; | |
50c2f753 | 661 | |
a891f0f8 PS |
662 | timeout = flags & CIFS_TIMEOUT_MASK; |
663 | optype = flags & CIFS_OP_MASK; | |
133672ef | 664 | |
a891f0f8 | 665 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
666 | |
667 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 668 | cifs_small_buf_release(buf); |
b6b38f70 | 669 | cERROR(1, "Null session"); |
7ee1af76 JA |
670 | return -EIO; |
671 | } | |
672 | ||
79a58d1f | 673 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 674 | cifs_small_buf_release(buf); |
7ee1af76 JA |
675 | return -ENOENT; |
676 | } | |
677 | ||
792af7b0 PS |
678 | /* |
679 | * Ensure that we do not send more than 50 overlapping requests | |
680 | * to the same server. We may make this configurable later or | |
681 | * use ses->maxReq. | |
682 | */ | |
7ee1af76 | 683 | |
a891f0f8 | 684 | rc = wait_for_free_request(ses->server, timeout, optype); |
7ee1af76 | 685 | if (rc) { |
792af7b0 | 686 | cifs_small_buf_release(buf); |
7ee1af76 JA |
687 | return rc; |
688 | } | |
689 | ||
792af7b0 PS |
690 | /* |
691 | * Make sure that we sign in the same order that we send on this socket | |
692 | * and avoid races inside tcp sendmsg code that could cause corruption | |
693 | * of smb data. | |
694 | */ | |
7ee1af76 | 695 | |
72ca545b | 696 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 697 | |
fec344e3 JL |
698 | midQ = ses->server->ops->setup_request(ses, &rqst); |
699 | if (IS_ERR(midQ)) { | |
72ca545b | 700 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 701 | cifs_small_buf_release(buf); |
7ee1af76 | 702 | /* Update # of requests on wire to server */ |
a891f0f8 | 703 | add_credits(ses->server, 1, optype); |
fec344e3 | 704 | return PTR_ERR(midQ); |
1da177e4 | 705 | } |
1da177e4 | 706 | |
7c9421e1 | 707 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 708 | cifs_in_send_inc(ses->server); |
0496e02d | 709 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
710 | cifs_in_send_dec(ses->server); |
711 | cifs_save_when_sent(midQ); | |
7ee1af76 | 712 | |
72ca545b | 713 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 714 | |
2db7c581 | 715 | if (rc < 0) { |
792af7b0 | 716 | cifs_small_buf_release(buf); |
7ee1af76 | 717 | goto out; |
2db7c581 | 718 | } |
4b8f930f | 719 | |
a891f0f8 | 720 | if (timeout == CIFS_ASYNC_OP) { |
792af7b0 | 721 | cifs_small_buf_release(buf); |
133672ef | 722 | goto out; |
2db7c581 | 723 | } |
d6e04ae6 | 724 | |
0ade640e | 725 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 726 | if (rc != 0) { |
121b046a | 727 | send_cancel(ses->server, buf, midQ); |
1be912dd | 728 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 729 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
730 | midQ->callback = DeleteMidQEntry; |
731 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 732 | cifs_small_buf_release(buf); |
a891f0f8 | 733 | add_credits(ses->server, 1, optype); |
1be912dd JL |
734 | return rc; |
735 | } | |
736 | spin_unlock(&GlobalMid_Lock); | |
737 | } | |
d6e04ae6 | 738 | |
792af7b0 | 739 | cifs_small_buf_release(buf); |
2db7c581 | 740 | |
3c1105df | 741 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 742 | if (rc != 0) { |
a891f0f8 | 743 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
744 | return rc; |
745 | } | |
50c2f753 | 746 | |
7c9421e1 | 747 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 748 | rc = -EIO; |
2c8f981d | 749 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
750 | goto out; |
751 | } | |
752 | ||
792af7b0 PS |
753 | buf = (char *)midQ->resp_buf; |
754 | iov[0].iov_base = buf; | |
755 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 756 | if (midQ->large_buf) |
a891f0f8 | 757 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 758 | else |
a891f0f8 PS |
759 | *resp_buf_type = CIFS_SMALL_BUFFER; |
760 | ||
761 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 762 | |
082d0642 PS |
763 | rc = ses->server->ops->check_receive(midQ, ses->server, |
764 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 765 | |
3c1bf7e4 | 766 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
767 | if ((flags & CIFS_NO_RESP) == 0) |
768 | midQ->resp_buf = NULL; | |
7ee1af76 | 769 | out: |
3c1bf7e4 | 770 | cifs_delete_mid(midQ); |
a891f0f8 | 771 | add_credits(ses->server, credits, optype); |
1da177e4 | 772 | |
d6e04ae6 SF |
773 | return rc; |
774 | } | |
1da177e4 LT |
775 | |
776 | int | |
96daf2b0 | 777 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 778 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 779 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
780 | { |
781 | int rc = 0; | |
1da177e4 LT |
782 | struct mid_q_entry *midQ; |
783 | ||
784 | if (ses == NULL) { | |
b6b38f70 | 785 | cERROR(1, "Null smb session"); |
1da177e4 LT |
786 | return -EIO; |
787 | } | |
79a58d1f | 788 | if (ses->server == NULL) { |
b6b38f70 | 789 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
790 | return -EIO; |
791 | } | |
792 | ||
79a58d1f | 793 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
794 | return -ENOENT; |
795 | ||
79a58d1f | 796 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
797 | to the same server. We may make this configurable later or |
798 | use ses->maxReq */ | |
1da177e4 | 799 | |
be8e3b00 SF |
800 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
801 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 802 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 803 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
804 | return -EIO; |
805 | } | |
806 | ||
a891f0f8 | 807 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
808 | if (rc) |
809 | return rc; | |
810 | ||
79a58d1f | 811 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
812 | and avoid races inside tcp sendmsg code that could cause corruption |
813 | of smb data */ | |
814 | ||
72ca545b | 815 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 816 | |
7ee1af76 JA |
817 | rc = allocate_mid(ses, in_buf, &midQ); |
818 | if (rc) { | |
72ca545b | 819 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 820 | /* Update # of requests on wire to server */ |
a891f0f8 | 821 | add_credits(ses->server, 1, 0); |
7ee1af76 | 822 | return rc; |
1da177e4 LT |
823 | } |
824 | ||
ad009ac9 | 825 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
826 | if (rc) { |
827 | mutex_unlock(&ses->server->srv_mutex); | |
828 | goto out; | |
829 | } | |
1da177e4 | 830 | |
7c9421e1 | 831 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
832 | |
833 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 834 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
835 | cifs_in_send_dec(ses->server); |
836 | cifs_save_when_sent(midQ); | |
72ca545b | 837 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 838 | |
79a58d1f | 839 | if (rc < 0) |
7ee1af76 JA |
840 | goto out; |
841 | ||
a891f0f8 | 842 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 843 | goto out; |
1da177e4 | 844 | |
0ade640e | 845 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 846 | if (rc != 0) { |
121b046a | 847 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 848 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 849 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
850 | /* no longer considered to be "in-flight" */ |
851 | midQ->callback = DeleteMidQEntry; | |
852 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 853 | add_credits(ses->server, 1, 0); |
1be912dd JL |
854 | return rc; |
855 | } | |
856 | spin_unlock(&GlobalMid_Lock); | |
857 | } | |
1da177e4 | 858 | |
3c1105df | 859 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 860 | if (rc != 0) { |
a891f0f8 | 861 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
862 | return rc; |
863 | } | |
50c2f753 | 864 | |
2c8f981d | 865 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 866 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 867 | rc = -EIO; |
b6b38f70 | 868 | cERROR(1, "Bad MID state?"); |
2c8f981d | 869 | goto out; |
1da177e4 | 870 | } |
7ee1af76 | 871 | |
d4e4854f | 872 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
873 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
874 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 875 | out: |
3c1bf7e4 | 876 | cifs_delete_mid(midQ); |
a891f0f8 | 877 | add_credits(ses->server, 1, 0); |
1da177e4 | 878 | |
7ee1af76 JA |
879 | return rc; |
880 | } | |
1da177e4 | 881 | |
7ee1af76 JA |
882 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
883 | blocking lock to return. */ | |
884 | ||
885 | static int | |
96daf2b0 | 886 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
887 | struct smb_hdr *in_buf, |
888 | struct smb_hdr *out_buf) | |
889 | { | |
890 | int bytes_returned; | |
96daf2b0 | 891 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
892 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
893 | ||
894 | /* We just modify the current in_buf to change | |
895 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
896 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
897 | LOCKING_ANDX_CANCEL_LOCK. */ | |
898 | ||
899 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
900 | pSMB->Timeout = 0; | |
88257360 | 901 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
902 | |
903 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 904 | &bytes_returned, 0); |
7ee1af76 JA |
905 | } |
906 | ||
907 | int | |
96daf2b0 | 908 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
909 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
910 | int *pbytes_returned) | |
911 | { | |
912 | int rc = 0; | |
913 | int rstart = 0; | |
7ee1af76 | 914 | struct mid_q_entry *midQ; |
96daf2b0 | 915 | struct cifs_ses *ses; |
7ee1af76 JA |
916 | |
917 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 918 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
919 | return -EIO; |
920 | } | |
921 | ses = tcon->ses; | |
922 | ||
79a58d1f | 923 | if (ses->server == NULL) { |
b6b38f70 | 924 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
925 | return -EIO; |
926 | } | |
927 | ||
79a58d1f | 928 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
929 | return -ENOENT; |
930 | ||
79a58d1f | 931 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
932 | to the same server. We may make this configurable later or |
933 | use ses->maxReq */ | |
934 | ||
be8e3b00 SF |
935 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
936 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 937 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 938 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
939 | return -EIO; |
940 | } | |
941 | ||
a891f0f8 | 942 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
943 | if (rc) |
944 | return rc; | |
945 | ||
79a58d1f | 946 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
947 | and avoid races inside tcp sendmsg code that could cause corruption |
948 | of smb data */ | |
949 | ||
72ca545b | 950 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
951 | |
952 | rc = allocate_mid(ses, in_buf, &midQ); | |
953 | if (rc) { | |
72ca545b | 954 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
955 | return rc; |
956 | } | |
957 | ||
7ee1af76 | 958 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 959 | if (rc) { |
3c1bf7e4 | 960 | cifs_delete_mid(midQ); |
829049cb VL |
961 | mutex_unlock(&ses->server->srv_mutex); |
962 | return rc; | |
963 | } | |
1da177e4 | 964 | |
7c9421e1 | 965 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 966 | cifs_in_send_inc(ses->server); |
be8e3b00 | 967 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
968 | cifs_in_send_dec(ses->server); |
969 | cifs_save_when_sent(midQ); | |
72ca545b | 970 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 971 | |
79a58d1f | 972 | if (rc < 0) { |
3c1bf7e4 | 973 | cifs_delete_mid(midQ); |
7ee1af76 JA |
974 | return rc; |
975 | } | |
976 | ||
977 | /* Wait for a reply - allow signals to interrupt. */ | |
978 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 979 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
980 | ((ses->server->tcpStatus != CifsGood) && |
981 | (ses->server->tcpStatus != CifsNew))); | |
982 | ||
983 | /* Were we interrupted by a signal ? */ | |
984 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 985 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
986 | ((ses->server->tcpStatus == CifsGood) || |
987 | (ses->server->tcpStatus == CifsNew))) { | |
988 | ||
989 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
990 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
991 | blocking lock to return. */ | |
121b046a | 992 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 993 | if (rc) { |
3c1bf7e4 | 994 | cifs_delete_mid(midQ); |
7ee1af76 JA |
995 | return rc; |
996 | } | |
997 | } else { | |
998 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
999 | to cause the blocking lock to return. */ | |
1000 | ||
1001 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1002 | ||
1003 | /* If we get -ENOLCK back the lock may have | |
1004 | already been removed. Don't exit in this case. */ | |
1005 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1006 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1007 | return rc; |
1008 | } | |
1009 | } | |
1010 | ||
1be912dd JL |
1011 | rc = wait_for_response(ses->server, midQ); |
1012 | if (rc) { | |
121b046a | 1013 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 1014 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1015 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1016 | /* no longer considered to be "in-flight" */ |
1017 | midQ->callback = DeleteMidQEntry; | |
1018 | spin_unlock(&GlobalMid_Lock); | |
1019 | return rc; | |
1020 | } | |
1021 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1022 | } |
1be912dd JL |
1023 | |
1024 | /* We got the response - restart system call. */ | |
1025 | rstart = 1; | |
7ee1af76 JA |
1026 | } |
1027 | ||
3c1105df | 1028 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1029 | if (rc != 0) |
7ee1af76 | 1030 | return rc; |
50c2f753 | 1031 | |
17c8bfed | 1032 | /* rcvd frame is ok */ |
7c9421e1 | 1033 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1034 | rc = -EIO; |
b6b38f70 | 1035 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
1036 | goto out; |
1037 | } | |
1da177e4 | 1038 | |
d4e4854f | 1039 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1040 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1041 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1042 | out: |
3c1bf7e4 | 1043 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1044 | if (rstart && rc == -EACCES) |
1045 | return -ERESTARTSYS; | |
1da177e4 LT |
1046 | return rc; |
1047 | } |