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> |
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) { |
f96637be | 52 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
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 | 63 | temp->command = cpu_to_le16(smb_buffer->Command); |
f96637be | 64 | cifs_dbg(FYI, "For smb_command %d\n", 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 | ||
a9f1b85e | 147 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 148 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
149 | smb_msg.msg_control = NULL; |
150 | smb_msg.msg_controllen = 0; | |
0496e02d | 151 | if (server->noblocksnd) |
edf1ae40 SF |
152 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
153 | else | |
154 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 155 | |
6f49f46b | 156 | remaining = 0; |
3e84469d | 157 | for (i = 0; i < n_vec; i++) |
6f49f46b | 158 | remaining += iov[i].iov_len; |
1da177e4 | 159 | |
17680356 | 160 | i = 0; |
6f49f46b JL |
161 | while (remaining) { |
162 | /* | |
163 | * If blocking send, we try 3 times, since each can block | |
164 | * for 5 seconds. For nonblocking we have to try more | |
165 | * but wait increasing amounts of time allowing time for | |
166 | * socket to clear. The overall time we wait in either | |
167 | * case to send on the socket is about 15 seconds. | |
168 | * Similarly we wait for 15 seconds for a response from | |
169 | * the server in SendReceive[2] for the server to send | |
170 | * a response back for most types of requests (except | |
171 | * SMB Write past end of file which can be slow, and | |
172 | * blocking lock operations). NFS waits slightly longer | |
173 | * than CIFS, but this can make it take longer for | |
174 | * nonresponsive servers to be detected and 15 seconds | |
175 | * is more than enough time for modern networks to | |
176 | * send a packet. In most cases if we fail to send | |
177 | * after the retries we will kill the socket and | |
178 | * reconnect which may clear the network problem. | |
179 | */ | |
3e84469d | 180 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], |
6f49f46b JL |
181 | n_vec - first_vec, remaining); |
182 | if (rc == -ENOSPC || rc == -EAGAIN) { | |
b7a10626 SF |
183 | /* |
184 | * Catch if a low level driver returns -ENOSPC. This | |
185 | * WARN_ON will be removed by 3.10 if no one reports | |
186 | * seeing this. | |
187 | */ | |
188 | WARN_ON_ONCE(rc == -ENOSPC); | |
1da177e4 | 189 | i++; |
6f49f46b | 190 | if (i >= 14 || (!server->noblocksnd && (i > 2))) { |
f96637be JP |
191 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
192 | ssocket); | |
1da177e4 LT |
193 | rc = -EAGAIN; |
194 | break; | |
195 | } | |
68058e75 | 196 | msleep(1 << i); |
1da177e4 LT |
197 | continue; |
198 | } | |
6f49f46b | 199 | |
79a58d1f | 200 | if (rc < 0) |
1da177e4 | 201 | break; |
3e84469d | 202 | |
6f49f46b JL |
203 | /* send was at least partially successful */ |
204 | *sent += rc; | |
205 | ||
206 | if (rc == remaining) { | |
207 | remaining = 0; | |
61de800d | 208 | break; |
6f49f46b JL |
209 | } |
210 | ||
211 | if (rc > remaining) { | |
f96637be | 212 | cifs_dbg(VFS, "sent %d requested %d\n", rc, remaining); |
3e84469d SF |
213 | break; |
214 | } | |
6f49f46b | 215 | |
79a58d1f | 216 | if (rc == 0) { |
3e84469d SF |
217 | /* should never happen, letting socket clear before |
218 | retrying is our only obvious option here */ | |
f96637be | 219 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
220 | msleep(500); |
221 | continue; | |
d6e04ae6 | 222 | } |
6f49f46b JL |
223 | |
224 | remaining -= rc; | |
225 | ||
68058e75 | 226 | /* the line below resets i */ |
3e84469d SF |
227 | for (i = first_vec; i < n_vec; i++) { |
228 | if (iov[i].iov_len) { | |
229 | if (rc > iov[i].iov_len) { | |
230 | rc -= iov[i].iov_len; | |
231 | iov[i].iov_len = 0; | |
232 | } else { | |
233 | iov[i].iov_base += rc; | |
234 | iov[i].iov_len -= rc; | |
235 | first_vec = i; | |
236 | break; | |
237 | } | |
238 | } | |
d6e04ae6 | 239 | } |
6f49f46b | 240 | |
5e1253b5 | 241 | i = 0; /* in case we get ENOSPC on the next send */ |
6f49f46b | 242 | rc = 0; |
1da177e4 | 243 | } |
6f49f46b JL |
244 | return rc; |
245 | } | |
246 | ||
97bc00b3 JL |
247 | /** |
248 | * rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec | |
249 | * @rqst: pointer to smb_rqst | |
250 | * @idx: index into the array of the page | |
251 | * @iov: pointer to struct kvec that will hold the result | |
252 | * | |
253 | * Helper function to convert a slot in the rqst->rq_pages array into a kvec. | |
254 | * The page will be kmapped and the address placed into iov_base. The length | |
255 | * will then be adjusted according to the ptailoff. | |
256 | */ | |
fb308a6f | 257 | void |
97bc00b3 JL |
258 | cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx, |
259 | struct kvec *iov) | |
260 | { | |
261 | /* | |
262 | * FIXME: We could avoid this kmap altogether if we used | |
263 | * kernel_sendpage instead of kernel_sendmsg. That will only | |
264 | * work if signing is disabled though as sendpage inlines the | |
265 | * page directly into the fraglist. If userspace modifies the | |
266 | * page after we calculate the signature, then the server will | |
267 | * reject it and may break the connection. kernel_sendmsg does | |
268 | * an extra copy of the data and avoids that issue. | |
269 | */ | |
270 | iov->iov_base = kmap(rqst->rq_pages[idx]); | |
271 | ||
272 | /* if last page, don't send beyond this offset into page */ | |
273 | if (idx == (rqst->rq_npages - 1)) | |
274 | iov->iov_len = rqst->rq_tailsz; | |
275 | else | |
276 | iov->iov_len = rqst->rq_pagesz; | |
277 | } | |
278 | ||
6f49f46b JL |
279 | static int |
280 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
281 | { | |
282 | int rc; | |
283 | struct kvec *iov = rqst->rq_iov; | |
284 | int n_vec = rqst->rq_nvec; | |
285 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
97bc00b3 JL |
286 | unsigned int i; |
287 | size_t total_len = 0, sent; | |
b8eed283 JL |
288 | struct socket *ssocket = server->ssocket; |
289 | int val = 1; | |
6f49f46b | 290 | |
ea702b80 JL |
291 | if (ssocket == NULL) |
292 | return -ENOTSOCK; | |
293 | ||
f96637be | 294 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
6f49f46b JL |
295 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
296 | ||
b8eed283 JL |
297 | /* cork the socket */ |
298 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
299 | (char *)&val, sizeof(val)); | |
300 | ||
97bc00b3 JL |
301 | rc = smb_send_kvec(server, iov, n_vec, &sent); |
302 | if (rc < 0) | |
303 | goto uncork; | |
304 | ||
305 | total_len += sent; | |
306 | ||
307 | /* now walk the page array and send each page in it */ | |
308 | for (i = 0; i < rqst->rq_npages; i++) { | |
309 | struct kvec p_iov; | |
310 | ||
311 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
312 | rc = smb_send_kvec(server, &p_iov, 1, &sent); | |
313 | kunmap(rqst->rq_pages[i]); | |
314 | if (rc < 0) | |
315 | break; | |
316 | ||
317 | total_len += sent; | |
318 | } | |
1da177e4 | 319 | |
97bc00b3 | 320 | uncork: |
b8eed283 JL |
321 | /* uncork it */ |
322 | val = 0; | |
323 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
324 | (char *)&val, sizeof(val)); | |
325 | ||
edf1ae40 | 326 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
f96637be JP |
327 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
328 | smb_buf_length + 4, total_len); | |
6f49f46b JL |
329 | /* |
330 | * If we have only sent part of an SMB then the next SMB could | |
331 | * be taken as the remainder of this one. We need to kill the | |
332 | * socket so the server throws away the partial SMB | |
333 | */ | |
edf1ae40 SF |
334 | server->tcpStatus = CifsNeedReconnect; |
335 | } | |
336 | ||
d804d41d | 337 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
338 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
339 | rc); | |
d804d41d | 340 | else |
1da177e4 | 341 | rc = 0; |
1da177e4 LT |
342 | |
343 | return rc; | |
344 | } | |
345 | ||
6f49f46b JL |
346 | static int |
347 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) | |
348 | { | |
349 | struct smb_rqst rqst = { .rq_iov = iov, | |
350 | .rq_nvec = n_vec }; | |
351 | ||
352 | return smb_send_rqst(server, &rqst); | |
353 | } | |
354 | ||
0496e02d JL |
355 | int |
356 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
357 | unsigned int smb_buf_length) | |
358 | { | |
359 | struct kvec iov; | |
360 | ||
361 | iov.iov_base = smb_buffer; | |
362 | iov.iov_len = smb_buf_length + 4; | |
363 | ||
364 | return smb_sendv(server, &iov, 1); | |
365 | } | |
366 | ||
fc40f9cf | 367 | static int |
a891f0f8 | 368 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 369 | int *credits) |
1da177e4 | 370 | { |
5bc59498 PS |
371 | int rc; |
372 | ||
fc40f9cf | 373 | spin_lock(&server->req_lock); |
a891f0f8 | 374 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 375 | /* oplock breaks must not be held up */ |
fc40f9cf | 376 | server->in_flight++; |
bc205ed1 | 377 | *credits -= 1; |
fc40f9cf | 378 | spin_unlock(&server->req_lock); |
27a97a61 VL |
379 | return 0; |
380 | } | |
381 | ||
27a97a61 | 382 | while (1) { |
bc205ed1 | 383 | if (*credits <= 0) { |
fc40f9cf | 384 | spin_unlock(&server->req_lock); |
789e6661 | 385 | cifs_num_waiters_inc(server); |
5bc59498 | 386 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 387 | has_credits(server, credits)); |
789e6661 | 388 | cifs_num_waiters_dec(server); |
5bc59498 PS |
389 | if (rc) |
390 | return rc; | |
fc40f9cf | 391 | spin_lock(&server->req_lock); |
27a97a61 | 392 | } else { |
c5797a94 | 393 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 394 | spin_unlock(&server->req_lock); |
27a97a61 | 395 | return -ENOENT; |
1da177e4 | 396 | } |
27a97a61 | 397 | |
2d86dbc9 PS |
398 | /* |
399 | * Can not count locking commands against total | |
400 | * as they are allowed to block on server. | |
401 | */ | |
27a97a61 VL |
402 | |
403 | /* update # of requests on the wire to server */ | |
a891f0f8 | 404 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 405 | *credits -= 1; |
fc40f9cf | 406 | server->in_flight++; |
2d86dbc9 | 407 | } |
fc40f9cf | 408 | spin_unlock(&server->req_lock); |
27a97a61 | 409 | break; |
1da177e4 LT |
410 | } |
411 | } | |
7ee1af76 JA |
412 | return 0; |
413 | } | |
1da177e4 | 414 | |
bc205ed1 | 415 | static int |
a891f0f8 PS |
416 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
417 | const int optype) | |
bc205ed1 | 418 | { |
a891f0f8 PS |
419 | return wait_for_free_credits(server, timeout, |
420 | server->ops->get_credits_field(server, optype)); | |
bc205ed1 PS |
421 | } |
422 | ||
96daf2b0 | 423 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
424 | struct mid_q_entry **ppmidQ) |
425 | { | |
1da177e4 | 426 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 427 | return -ENOENT; |
8fbbd365 VL |
428 | } |
429 | ||
430 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 431 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 432 | return -EAGAIN; |
8fbbd365 VL |
433 | } |
434 | ||
435 | if (ses->status != CifsGood) { | |
1da177e4 | 436 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 437 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 438 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 439 | return -EAGAIN; |
ad7a2926 | 440 | /* else ok - we are setting up session */ |
1da177e4 | 441 | } |
24b9b06b | 442 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 443 | if (*ppmidQ == NULL) |
7ee1af76 | 444 | return -ENOMEM; |
ddc8cf8f JL |
445 | spin_lock(&GlobalMid_Lock); |
446 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
447 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
448 | return 0; |
449 | } | |
450 | ||
0ade640e JL |
451 | static int |
452 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 453 | { |
0ade640e | 454 | int error; |
7ee1af76 | 455 | |
f06ac72e | 456 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 457 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
458 | if (error < 0) |
459 | return -ERESTARTSYS; | |
7ee1af76 | 460 | |
0ade640e | 461 | return 0; |
7ee1af76 JA |
462 | } |
463 | ||
fec344e3 JL |
464 | struct mid_q_entry * |
465 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
466 | { |
467 | int rc; | |
fec344e3 | 468 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
469 | struct mid_q_entry *mid; |
470 | ||
471 | /* enable signing if server requires it */ | |
472 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
473 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
474 | ||
475 | mid = AllocMidQEntry(hdr, server); | |
476 | if (mid == NULL) | |
fec344e3 | 477 | return ERR_PTR(-ENOMEM); |
792af7b0 | 478 | |
fec344e3 | 479 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
480 | if (rc) { |
481 | DeleteMidQEntry(mid); | |
fec344e3 | 482 | return ERR_PTR(rc); |
ffc61ccb SP |
483 | } |
484 | ||
fec344e3 | 485 | return mid; |
792af7b0 | 486 | } |
133672ef | 487 | |
a6827c18 JL |
488 | /* |
489 | * Send a SMB request and set the callback function in the mid to handle | |
490 | * the result. Caller is responsible for dealing with timeouts. | |
491 | */ | |
492 | int | |
fec344e3 JL |
493 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
494 | mid_receive_t *receive, mid_callback_t *callback, | |
495 | void *cbdata, const int flags) | |
a6827c18 | 496 | { |
a891f0f8 | 497 | int rc, timeout, optype; |
a6827c18 JL |
498 | struct mid_q_entry *mid; |
499 | ||
a891f0f8 PS |
500 | timeout = flags & CIFS_TIMEOUT_MASK; |
501 | optype = flags & CIFS_OP_MASK; | |
502 | ||
503 | rc = wait_for_free_request(server, timeout, optype); | |
a6827c18 JL |
504 | if (rc) |
505 | return rc; | |
506 | ||
507 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
508 | mid = server->ops->setup_async_request(server, rqst); |
509 | if (IS_ERR(mid)) { | |
a6827c18 | 510 | mutex_unlock(&server->srv_mutex); |
a891f0f8 | 511 | add_credits(server, 1, optype); |
0193e072 | 512 | wake_up(&server->request_q); |
fec344e3 | 513 | return PTR_ERR(mid); |
a6827c18 JL |
514 | } |
515 | ||
44d22d84 | 516 | mid->receive = receive; |
a6827c18 JL |
517 | mid->callback = callback; |
518 | mid->callback_data = cbdata; | |
7c9421e1 | 519 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 520 | |
ffc61ccb SP |
521 | /* put it on the pending_mid_q */ |
522 | spin_lock(&GlobalMid_Lock); | |
523 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
524 | spin_unlock(&GlobalMid_Lock); | |
525 | ||
526 | ||
789e6661 | 527 | cifs_in_send_inc(server); |
fec344e3 | 528 | rc = smb_send_rqst(server, rqst); |
789e6661 SF |
529 | cifs_in_send_dec(server); |
530 | cifs_save_when_sent(mid); | |
a6827c18 | 531 | mutex_unlock(&server->srv_mutex); |
789e6661 | 532 | |
ffc61ccb SP |
533 | if (rc == 0) |
534 | return 0; | |
a6827c18 | 535 | |
3c1bf7e4 | 536 | cifs_delete_mid(mid); |
a891f0f8 | 537 | add_credits(server, 1, optype); |
a6827c18 JL |
538 | wake_up(&server->request_q); |
539 | return rc; | |
540 | } | |
541 | ||
133672ef SF |
542 | /* |
543 | * | |
544 | * Send an SMB Request. No response info (other than return code) | |
545 | * needs to be parsed. | |
546 | * | |
547 | * flags indicate the type of request buffer and how long to wait | |
548 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
549 | * | |
550 | */ | |
551 | int | |
96daf2b0 | 552 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 553 | char *in_buf, int flags) |
133672ef SF |
554 | { |
555 | int rc; | |
556 | struct kvec iov[1]; | |
557 | int resp_buf_type; | |
558 | ||
792af7b0 PS |
559 | iov[0].iov_base = in_buf; |
560 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
561 | flags |= CIFS_NO_RESP; |
562 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
f96637be | 563 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 564 | |
133672ef SF |
565 | return rc; |
566 | } | |
567 | ||
053d5034 | 568 | static int |
3c1105df | 569 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
570 | { |
571 | int rc = 0; | |
572 | ||
f96637be JP |
573 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
574 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 575 | |
74dd92a8 | 576 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 577 | switch (mid->mid_state) { |
74dd92a8 | 578 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
579 | spin_unlock(&GlobalMid_Lock); |
580 | return rc; | |
74dd92a8 JL |
581 | case MID_RETRY_NEEDED: |
582 | rc = -EAGAIN; | |
583 | break; | |
71823baf JL |
584 | case MID_RESPONSE_MALFORMED: |
585 | rc = -EIO; | |
586 | break; | |
3c1105df JL |
587 | case MID_SHUTDOWN: |
588 | rc = -EHOSTDOWN; | |
589 | break; | |
74dd92a8 | 590 | default: |
3c1105df | 591 | list_del_init(&mid->qhead); |
f96637be JP |
592 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
593 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 594 | rc = -EIO; |
053d5034 JL |
595 | } |
596 | spin_unlock(&GlobalMid_Lock); | |
597 | ||
2b84a36c | 598 | DeleteMidQEntry(mid); |
053d5034 JL |
599 | return rc; |
600 | } | |
601 | ||
121b046a JL |
602 | static inline int |
603 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 604 | { |
121b046a JL |
605 | return server->ops->send_cancel ? |
606 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
607 | } |
608 | ||
2c8f981d JL |
609 | int |
610 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
611 | bool log_error) | |
612 | { | |
792af7b0 | 613 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
614 | |
615 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
616 | |
617 | /* convert the length into a more usable form */ | |
96daf2b0 | 618 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 | 619 | struct kvec iov; |
985e4ff0 | 620 | int rc = 0; |
bf5ea0e2 JL |
621 | struct smb_rqst rqst = { .rq_iov = &iov, |
622 | .rq_nvec = 1 }; | |
826a95e4 JL |
623 | |
624 | iov.iov_base = mid->resp_buf; | |
625 | iov.iov_len = len; | |
2c8f981d | 626 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 627 | rc = cifs_verify_signature(&rqst, server, |
985e4ff0 SF |
628 | mid->sequence_number + 1); |
629 | if (rc) | |
f96637be JP |
630 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
631 | rc); | |
2c8f981d JL |
632 | } |
633 | ||
634 | /* BB special case reconnect tid and uid here? */ | |
635 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
636 | } | |
637 | ||
fec344e3 JL |
638 | struct mid_q_entry * |
639 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
640 | { |
641 | int rc; | |
fec344e3 | 642 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
643 | struct mid_q_entry *mid; |
644 | ||
645 | rc = allocate_mid(ses, hdr, &mid); | |
646 | if (rc) | |
fec344e3 JL |
647 | return ERR_PTR(rc); |
648 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
649 | if (rc) { | |
3c1bf7e4 | 650 | cifs_delete_mid(mid); |
fec344e3 JL |
651 | return ERR_PTR(rc); |
652 | } | |
653 | return mid; | |
792af7b0 PS |
654 | } |
655 | ||
7ee1af76 | 656 | int |
96daf2b0 | 657 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
a891f0f8 | 658 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
133672ef | 659 | const int flags) |
7ee1af76 JA |
660 | { |
661 | int rc = 0; | |
a891f0f8 | 662 | int timeout, optype; |
7ee1af76 | 663 | struct mid_q_entry *midQ; |
792af7b0 | 664 | char *buf = iov[0].iov_base; |
a891f0f8 | 665 | unsigned int credits = 1; |
fec344e3 JL |
666 | struct smb_rqst rqst = { .rq_iov = iov, |
667 | .rq_nvec = n_vec }; | |
50c2f753 | 668 | |
a891f0f8 PS |
669 | timeout = flags & CIFS_TIMEOUT_MASK; |
670 | optype = flags & CIFS_OP_MASK; | |
133672ef | 671 | |
a891f0f8 | 672 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
673 | |
674 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 675 | cifs_small_buf_release(buf); |
f96637be | 676 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
677 | return -EIO; |
678 | } | |
679 | ||
79a58d1f | 680 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 681 | cifs_small_buf_release(buf); |
7ee1af76 JA |
682 | return -ENOENT; |
683 | } | |
684 | ||
792af7b0 PS |
685 | /* |
686 | * Ensure that we do not send more than 50 overlapping requests | |
687 | * to the same server. We may make this configurable later or | |
688 | * use ses->maxReq. | |
689 | */ | |
7ee1af76 | 690 | |
a891f0f8 | 691 | rc = wait_for_free_request(ses->server, timeout, optype); |
7ee1af76 | 692 | if (rc) { |
792af7b0 | 693 | cifs_small_buf_release(buf); |
7ee1af76 JA |
694 | return rc; |
695 | } | |
696 | ||
792af7b0 PS |
697 | /* |
698 | * Make sure that we sign in the same order that we send on this socket | |
699 | * and avoid races inside tcp sendmsg code that could cause corruption | |
700 | * of smb data. | |
701 | */ | |
7ee1af76 | 702 | |
72ca545b | 703 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 704 | |
fec344e3 JL |
705 | midQ = ses->server->ops->setup_request(ses, &rqst); |
706 | if (IS_ERR(midQ)) { | |
72ca545b | 707 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 708 | cifs_small_buf_release(buf); |
7ee1af76 | 709 | /* Update # of requests on wire to server */ |
a891f0f8 | 710 | add_credits(ses->server, 1, optype); |
fec344e3 | 711 | return PTR_ERR(midQ); |
1da177e4 | 712 | } |
1da177e4 | 713 | |
7c9421e1 | 714 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 715 | cifs_in_send_inc(ses->server); |
0496e02d | 716 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
717 | cifs_in_send_dec(ses->server); |
718 | cifs_save_when_sent(midQ); | |
7ee1af76 | 719 | |
72ca545b | 720 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 721 | |
2db7c581 | 722 | if (rc < 0) { |
792af7b0 | 723 | cifs_small_buf_release(buf); |
7ee1af76 | 724 | goto out; |
2db7c581 | 725 | } |
4b8f930f | 726 | |
a891f0f8 | 727 | if (timeout == CIFS_ASYNC_OP) { |
792af7b0 | 728 | cifs_small_buf_release(buf); |
133672ef | 729 | goto out; |
2db7c581 | 730 | } |
d6e04ae6 | 731 | |
0ade640e | 732 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 733 | if (rc != 0) { |
121b046a | 734 | send_cancel(ses->server, buf, midQ); |
1be912dd | 735 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 736 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
737 | midQ->callback = DeleteMidQEntry; |
738 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 739 | cifs_small_buf_release(buf); |
a891f0f8 | 740 | add_credits(ses->server, 1, optype); |
1be912dd JL |
741 | return rc; |
742 | } | |
743 | spin_unlock(&GlobalMid_Lock); | |
744 | } | |
d6e04ae6 | 745 | |
792af7b0 | 746 | cifs_small_buf_release(buf); |
2db7c581 | 747 | |
3c1105df | 748 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 749 | if (rc != 0) { |
a891f0f8 | 750 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
751 | return rc; |
752 | } | |
50c2f753 | 753 | |
7c9421e1 | 754 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 755 | rc = -EIO; |
f96637be | 756 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
757 | goto out; |
758 | } | |
759 | ||
792af7b0 PS |
760 | buf = (char *)midQ->resp_buf; |
761 | iov[0].iov_base = buf; | |
762 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 763 | if (midQ->large_buf) |
a891f0f8 | 764 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 765 | else |
a891f0f8 PS |
766 | *resp_buf_type = CIFS_SMALL_BUFFER; |
767 | ||
768 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 769 | |
082d0642 PS |
770 | rc = ses->server->ops->check_receive(midQ, ses->server, |
771 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 772 | |
3c1bf7e4 | 773 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
774 | if ((flags & CIFS_NO_RESP) == 0) |
775 | midQ->resp_buf = NULL; | |
7ee1af76 | 776 | out: |
3c1bf7e4 | 777 | cifs_delete_mid(midQ); |
a891f0f8 | 778 | add_credits(ses->server, credits, optype); |
1da177e4 | 779 | |
d6e04ae6 SF |
780 | return rc; |
781 | } | |
1da177e4 LT |
782 | |
783 | int | |
96daf2b0 | 784 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 785 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 786 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
787 | { |
788 | int rc = 0; | |
1da177e4 LT |
789 | struct mid_q_entry *midQ; |
790 | ||
791 | if (ses == NULL) { | |
f96637be | 792 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
793 | return -EIO; |
794 | } | |
79a58d1f | 795 | if (ses->server == NULL) { |
f96637be | 796 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
797 | return -EIO; |
798 | } | |
799 | ||
79a58d1f | 800 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
801 | return -ENOENT; |
802 | ||
79a58d1f | 803 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
804 | to the same server. We may make this configurable later or |
805 | use ses->maxReq */ | |
1da177e4 | 806 | |
be8e3b00 SF |
807 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
808 | MAX_CIFS_HDR_SIZE - 4) { | |
f96637be JP |
809 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
810 | be32_to_cpu(in_buf->smb_buf_length)); | |
6d9c6d54 VL |
811 | return -EIO; |
812 | } | |
813 | ||
a891f0f8 | 814 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
815 | if (rc) |
816 | return rc; | |
817 | ||
79a58d1f | 818 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
819 | and avoid races inside tcp sendmsg code that could cause corruption |
820 | of smb data */ | |
821 | ||
72ca545b | 822 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 823 | |
7ee1af76 JA |
824 | rc = allocate_mid(ses, in_buf, &midQ); |
825 | if (rc) { | |
72ca545b | 826 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 827 | /* Update # of requests on wire to server */ |
a891f0f8 | 828 | add_credits(ses->server, 1, 0); |
7ee1af76 | 829 | return rc; |
1da177e4 LT |
830 | } |
831 | ||
ad009ac9 | 832 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
833 | if (rc) { |
834 | mutex_unlock(&ses->server->srv_mutex); | |
835 | goto out; | |
836 | } | |
1da177e4 | 837 | |
7c9421e1 | 838 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
839 | |
840 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 841 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
842 | cifs_in_send_dec(ses->server); |
843 | cifs_save_when_sent(midQ); | |
72ca545b | 844 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 845 | |
79a58d1f | 846 | if (rc < 0) |
7ee1af76 JA |
847 | goto out; |
848 | ||
a891f0f8 | 849 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 850 | goto out; |
1da177e4 | 851 | |
0ade640e | 852 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 853 | if (rc != 0) { |
121b046a | 854 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 855 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 856 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
857 | /* no longer considered to be "in-flight" */ |
858 | midQ->callback = DeleteMidQEntry; | |
859 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 860 | add_credits(ses->server, 1, 0); |
1be912dd JL |
861 | return rc; |
862 | } | |
863 | spin_unlock(&GlobalMid_Lock); | |
864 | } | |
1da177e4 | 865 | |
3c1105df | 866 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 867 | if (rc != 0) { |
a891f0f8 | 868 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
869 | return rc; |
870 | } | |
50c2f753 | 871 | |
2c8f981d | 872 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 873 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 874 | rc = -EIO; |
f96637be | 875 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 876 | goto out; |
1da177e4 | 877 | } |
7ee1af76 | 878 | |
d4e4854f | 879 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
880 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
881 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 882 | out: |
3c1bf7e4 | 883 | cifs_delete_mid(midQ); |
a891f0f8 | 884 | add_credits(ses->server, 1, 0); |
1da177e4 | 885 | |
7ee1af76 JA |
886 | return rc; |
887 | } | |
1da177e4 | 888 | |
7ee1af76 JA |
889 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
890 | blocking lock to return. */ | |
891 | ||
892 | static int | |
96daf2b0 | 893 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
894 | struct smb_hdr *in_buf, |
895 | struct smb_hdr *out_buf) | |
896 | { | |
897 | int bytes_returned; | |
96daf2b0 | 898 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
899 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
900 | ||
901 | /* We just modify the current in_buf to change | |
902 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
903 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
904 | LOCKING_ANDX_CANCEL_LOCK. */ | |
905 | ||
906 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
907 | pSMB->Timeout = 0; | |
88257360 | 908 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
909 | |
910 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 911 | &bytes_returned, 0); |
7ee1af76 JA |
912 | } |
913 | ||
914 | int | |
96daf2b0 | 915 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
916 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
917 | int *pbytes_returned) | |
918 | { | |
919 | int rc = 0; | |
920 | int rstart = 0; | |
7ee1af76 | 921 | struct mid_q_entry *midQ; |
96daf2b0 | 922 | struct cifs_ses *ses; |
7ee1af76 JA |
923 | |
924 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 925 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
926 | return -EIO; |
927 | } | |
928 | ses = tcon->ses; | |
929 | ||
79a58d1f | 930 | if (ses->server == NULL) { |
f96637be | 931 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
932 | return -EIO; |
933 | } | |
934 | ||
79a58d1f | 935 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
936 | return -ENOENT; |
937 | ||
79a58d1f | 938 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
939 | to the same server. We may make this configurable later or |
940 | use ses->maxReq */ | |
941 | ||
be8e3b00 SF |
942 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
943 | MAX_CIFS_HDR_SIZE - 4) { | |
f96637be JP |
944 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
945 | be32_to_cpu(in_buf->smb_buf_length)); | |
6d9c6d54 VL |
946 | return -EIO; |
947 | } | |
948 | ||
a891f0f8 | 949 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
950 | if (rc) |
951 | return rc; | |
952 | ||
79a58d1f | 953 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
954 | and avoid races inside tcp sendmsg code that could cause corruption |
955 | of smb data */ | |
956 | ||
72ca545b | 957 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
958 | |
959 | rc = allocate_mid(ses, in_buf, &midQ); | |
960 | if (rc) { | |
72ca545b | 961 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
962 | return rc; |
963 | } | |
964 | ||
7ee1af76 | 965 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 966 | if (rc) { |
3c1bf7e4 | 967 | cifs_delete_mid(midQ); |
829049cb VL |
968 | mutex_unlock(&ses->server->srv_mutex); |
969 | return rc; | |
970 | } | |
1da177e4 | 971 | |
7c9421e1 | 972 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 973 | cifs_in_send_inc(ses->server); |
be8e3b00 | 974 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
975 | cifs_in_send_dec(ses->server); |
976 | cifs_save_when_sent(midQ); | |
72ca545b | 977 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 978 | |
79a58d1f | 979 | if (rc < 0) { |
3c1bf7e4 | 980 | cifs_delete_mid(midQ); |
7ee1af76 JA |
981 | return rc; |
982 | } | |
983 | ||
984 | /* Wait for a reply - allow signals to interrupt. */ | |
985 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 986 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
987 | ((ses->server->tcpStatus != CifsGood) && |
988 | (ses->server->tcpStatus != CifsNew))); | |
989 | ||
990 | /* Were we interrupted by a signal ? */ | |
991 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 992 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
993 | ((ses->server->tcpStatus == CifsGood) || |
994 | (ses->server->tcpStatus == CifsNew))) { | |
995 | ||
996 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
997 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
998 | blocking lock to return. */ | |
121b046a | 999 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 1000 | if (rc) { |
3c1bf7e4 | 1001 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1002 | return rc; |
1003 | } | |
1004 | } else { | |
1005 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1006 | to cause the blocking lock to return. */ | |
1007 | ||
1008 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1009 | ||
1010 | /* If we get -ENOLCK back the lock may have | |
1011 | already been removed. Don't exit in this case. */ | |
1012 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1013 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1014 | return rc; |
1015 | } | |
1016 | } | |
1017 | ||
1be912dd JL |
1018 | rc = wait_for_response(ses->server, midQ); |
1019 | if (rc) { | |
121b046a | 1020 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 1021 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1022 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1023 | /* no longer considered to be "in-flight" */ |
1024 | midQ->callback = DeleteMidQEntry; | |
1025 | spin_unlock(&GlobalMid_Lock); | |
1026 | return rc; | |
1027 | } | |
1028 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1029 | } |
1be912dd JL |
1030 | |
1031 | /* We got the response - restart system call. */ | |
1032 | rstart = 1; | |
7ee1af76 JA |
1033 | } |
1034 | ||
3c1105df | 1035 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1036 | if (rc != 0) |
7ee1af76 | 1037 | return rc; |
50c2f753 | 1038 | |
17c8bfed | 1039 | /* rcvd frame is ok */ |
7c9421e1 | 1040 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1041 | rc = -EIO; |
f96637be | 1042 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1043 | goto out; |
1044 | } | |
1da177e4 | 1045 | |
d4e4854f | 1046 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1047 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1048 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1049 | out: |
3c1bf7e4 | 1050 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1051 | if (rstart && rc == -EACCES) |
1052 | return -ERESTARTSYS; | |
1da177e4 LT |
1053 | return rc; |
1054 | } |