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)); |
3d378d3f | 61 | temp->mid = get_mid(smb_buffer); |
1da177e4 | 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 | 181 | n_vec - first_vec, remaining); |
ce6c44e4 | 182 | if (rc == -EAGAIN) { |
1da177e4 | 183 | i++; |
6f49f46b | 184 | if (i >= 14 || (!server->noblocksnd && (i > 2))) { |
f96637be JP |
185 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
186 | ssocket); | |
1da177e4 LT |
187 | rc = -EAGAIN; |
188 | break; | |
189 | } | |
68058e75 | 190 | msleep(1 << i); |
1da177e4 LT |
191 | continue; |
192 | } | |
6f49f46b | 193 | |
79a58d1f | 194 | if (rc < 0) |
1da177e4 | 195 | break; |
3e84469d | 196 | |
6f49f46b JL |
197 | /* send was at least partially successful */ |
198 | *sent += rc; | |
199 | ||
200 | if (rc == remaining) { | |
201 | remaining = 0; | |
61de800d | 202 | break; |
6f49f46b JL |
203 | } |
204 | ||
205 | if (rc > remaining) { | |
f96637be | 206 | cifs_dbg(VFS, "sent %d requested %d\n", rc, remaining); |
3e84469d SF |
207 | break; |
208 | } | |
6f49f46b | 209 | |
79a58d1f | 210 | if (rc == 0) { |
3e84469d SF |
211 | /* should never happen, letting socket clear before |
212 | retrying is our only obvious option here */ | |
f96637be | 213 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
214 | msleep(500); |
215 | continue; | |
d6e04ae6 | 216 | } |
6f49f46b JL |
217 | |
218 | remaining -= rc; | |
219 | ||
68058e75 | 220 | /* the line below resets i */ |
3e84469d SF |
221 | for (i = first_vec; i < n_vec; i++) { |
222 | if (iov[i].iov_len) { | |
223 | if (rc > iov[i].iov_len) { | |
224 | rc -= iov[i].iov_len; | |
225 | iov[i].iov_len = 0; | |
226 | } else { | |
227 | iov[i].iov_base += rc; | |
228 | iov[i].iov_len -= rc; | |
229 | first_vec = i; | |
230 | break; | |
231 | } | |
232 | } | |
d6e04ae6 | 233 | } |
6f49f46b | 234 | |
5e1253b5 | 235 | i = 0; /* in case we get ENOSPC on the next send */ |
6f49f46b | 236 | rc = 0; |
1da177e4 | 237 | } |
6f49f46b JL |
238 | return rc; |
239 | } | |
240 | ||
97bc00b3 JL |
241 | /** |
242 | * rqst_page_to_kvec - Turn a slot in the smb_rqst page array into a kvec | |
243 | * @rqst: pointer to smb_rqst | |
244 | * @idx: index into the array of the page | |
245 | * @iov: pointer to struct kvec that will hold the result | |
246 | * | |
247 | * Helper function to convert a slot in the rqst->rq_pages array into a kvec. | |
248 | * The page will be kmapped and the address placed into iov_base. The length | |
249 | * will then be adjusted according to the ptailoff. | |
250 | */ | |
fb308a6f | 251 | void |
97bc00b3 JL |
252 | cifs_rqst_page_to_kvec(struct smb_rqst *rqst, unsigned int idx, |
253 | struct kvec *iov) | |
254 | { | |
255 | /* | |
256 | * FIXME: We could avoid this kmap altogether if we used | |
257 | * kernel_sendpage instead of kernel_sendmsg. That will only | |
258 | * work if signing is disabled though as sendpage inlines the | |
259 | * page directly into the fraglist. If userspace modifies the | |
260 | * page after we calculate the signature, then the server will | |
261 | * reject it and may break the connection. kernel_sendmsg does | |
262 | * an extra copy of the data and avoids that issue. | |
263 | */ | |
264 | iov->iov_base = kmap(rqst->rq_pages[idx]); | |
265 | ||
266 | /* if last page, don't send beyond this offset into page */ | |
267 | if (idx == (rqst->rq_npages - 1)) | |
268 | iov->iov_len = rqst->rq_tailsz; | |
269 | else | |
270 | iov->iov_len = rqst->rq_pagesz; | |
271 | } | |
272 | ||
a26054d1 JL |
273 | static unsigned long |
274 | rqst_len(struct smb_rqst *rqst) | |
275 | { | |
276 | unsigned int i; | |
277 | struct kvec *iov = rqst->rq_iov; | |
278 | unsigned long buflen = 0; | |
279 | ||
280 | /* total up iov array first */ | |
281 | for (i = 0; i < rqst->rq_nvec; i++) | |
282 | buflen += iov[i].iov_len; | |
283 | ||
284 | /* add in the page array if there is one */ | |
285 | if (rqst->rq_npages) { | |
286 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1); | |
287 | buflen += rqst->rq_tailsz; | |
288 | } | |
289 | ||
290 | return buflen; | |
291 | } | |
292 | ||
6f49f46b JL |
293 | static int |
294 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
295 | { | |
296 | int rc; | |
297 | struct kvec *iov = rqst->rq_iov; | |
298 | int n_vec = rqst->rq_nvec; | |
299 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
a26054d1 | 300 | unsigned long send_length; |
97bc00b3 JL |
301 | unsigned int i; |
302 | size_t total_len = 0, sent; | |
b8eed283 JL |
303 | struct socket *ssocket = server->ssocket; |
304 | int val = 1; | |
6f49f46b | 305 | |
ea702b80 JL |
306 | if (ssocket == NULL) |
307 | return -ENOTSOCK; | |
308 | ||
a26054d1 JL |
309 | /* sanity check send length */ |
310 | send_length = rqst_len(rqst); | |
311 | if (send_length != smb_buf_length + 4) { | |
312 | WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n", | |
313 | send_length, smb_buf_length); | |
314 | return -EIO; | |
315 | } | |
316 | ||
f96637be | 317 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
6f49f46b JL |
318 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
319 | ||
b8eed283 JL |
320 | /* cork the socket */ |
321 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
322 | (char *)&val, sizeof(val)); | |
323 | ||
97bc00b3 JL |
324 | rc = smb_send_kvec(server, iov, n_vec, &sent); |
325 | if (rc < 0) | |
326 | goto uncork; | |
327 | ||
328 | total_len += sent; | |
329 | ||
330 | /* now walk the page array and send each page in it */ | |
331 | for (i = 0; i < rqst->rq_npages; i++) { | |
332 | struct kvec p_iov; | |
333 | ||
334 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
335 | rc = smb_send_kvec(server, &p_iov, 1, &sent); | |
336 | kunmap(rqst->rq_pages[i]); | |
337 | if (rc < 0) | |
338 | break; | |
339 | ||
340 | total_len += sent; | |
341 | } | |
1da177e4 | 342 | |
97bc00b3 | 343 | uncork: |
b8eed283 JL |
344 | /* uncork it */ |
345 | val = 0; | |
346 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
347 | (char *)&val, sizeof(val)); | |
348 | ||
edf1ae40 | 349 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
f96637be JP |
350 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
351 | smb_buf_length + 4, total_len); | |
6f49f46b JL |
352 | /* |
353 | * If we have only sent part of an SMB then the next SMB could | |
354 | * be taken as the remainder of this one. We need to kill the | |
355 | * socket so the server throws away the partial SMB | |
356 | */ | |
edf1ae40 SF |
357 | server->tcpStatus = CifsNeedReconnect; |
358 | } | |
359 | ||
d804d41d | 360 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
361 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
362 | rc); | |
d804d41d | 363 | else |
1da177e4 | 364 | rc = 0; |
1da177e4 LT |
365 | |
366 | return rc; | |
367 | } | |
368 | ||
6f49f46b JL |
369 | static int |
370 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) | |
371 | { | |
372 | struct smb_rqst rqst = { .rq_iov = iov, | |
373 | .rq_nvec = n_vec }; | |
374 | ||
375 | return smb_send_rqst(server, &rqst); | |
376 | } | |
377 | ||
0496e02d JL |
378 | int |
379 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
380 | unsigned int smb_buf_length) | |
381 | { | |
382 | struct kvec iov; | |
383 | ||
384 | iov.iov_base = smb_buffer; | |
385 | iov.iov_len = smb_buf_length + 4; | |
386 | ||
387 | return smb_sendv(server, &iov, 1); | |
388 | } | |
389 | ||
fc40f9cf | 390 | static int |
a891f0f8 | 391 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 392 | int *credits) |
1da177e4 | 393 | { |
5bc59498 PS |
394 | int rc; |
395 | ||
fc40f9cf | 396 | spin_lock(&server->req_lock); |
a891f0f8 | 397 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 398 | /* oplock breaks must not be held up */ |
fc40f9cf | 399 | server->in_flight++; |
bc205ed1 | 400 | *credits -= 1; |
fc40f9cf | 401 | spin_unlock(&server->req_lock); |
27a97a61 VL |
402 | return 0; |
403 | } | |
404 | ||
27a97a61 | 405 | while (1) { |
bc205ed1 | 406 | if (*credits <= 0) { |
fc40f9cf | 407 | spin_unlock(&server->req_lock); |
789e6661 | 408 | cifs_num_waiters_inc(server); |
5bc59498 | 409 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 410 | has_credits(server, credits)); |
789e6661 | 411 | cifs_num_waiters_dec(server); |
5bc59498 PS |
412 | if (rc) |
413 | return rc; | |
fc40f9cf | 414 | spin_lock(&server->req_lock); |
27a97a61 | 415 | } else { |
c5797a94 | 416 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 417 | spin_unlock(&server->req_lock); |
27a97a61 | 418 | return -ENOENT; |
1da177e4 | 419 | } |
27a97a61 | 420 | |
2d86dbc9 PS |
421 | /* |
422 | * Can not count locking commands against total | |
423 | * as they are allowed to block on server. | |
424 | */ | |
27a97a61 VL |
425 | |
426 | /* update # of requests on the wire to server */ | |
a891f0f8 | 427 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 428 | *credits -= 1; |
fc40f9cf | 429 | server->in_flight++; |
2d86dbc9 | 430 | } |
fc40f9cf | 431 | spin_unlock(&server->req_lock); |
27a97a61 | 432 | break; |
1da177e4 LT |
433 | } |
434 | } | |
7ee1af76 JA |
435 | return 0; |
436 | } | |
1da177e4 | 437 | |
bc205ed1 | 438 | static int |
a891f0f8 PS |
439 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
440 | const int optype) | |
bc205ed1 | 441 | { |
eb4c7df6 SP |
442 | int *val; |
443 | ||
444 | val = server->ops->get_credits_field(server, optype); | |
445 | /* Since an echo is already inflight, no need to wait to send another */ | |
446 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
447 | return -EAGAIN; | |
448 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
449 | } |
450 | ||
96daf2b0 | 451 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
452 | struct mid_q_entry **ppmidQ) |
453 | { | |
1da177e4 | 454 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 455 | return -ENOENT; |
8fbbd365 VL |
456 | } |
457 | ||
458 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 459 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 460 | return -EAGAIN; |
8fbbd365 VL |
461 | } |
462 | ||
7f48558e | 463 | if (ses->status == CifsNew) { |
79a58d1f | 464 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 465 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 466 | return -EAGAIN; |
ad7a2926 | 467 | /* else ok - we are setting up session */ |
1da177e4 | 468 | } |
7f48558e SP |
469 | |
470 | if (ses->status == CifsExiting) { | |
471 | /* check if SMB session is bad because we are setting it up */ | |
472 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
473 | return -EAGAIN; | |
474 | /* else ok - we are shutting down session */ | |
475 | } | |
476 | ||
24b9b06b | 477 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 478 | if (*ppmidQ == NULL) |
7ee1af76 | 479 | return -ENOMEM; |
ddc8cf8f JL |
480 | spin_lock(&GlobalMid_Lock); |
481 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
482 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
483 | return 0; |
484 | } | |
485 | ||
0ade640e JL |
486 | static int |
487 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 488 | { |
0ade640e | 489 | int error; |
7ee1af76 | 490 | |
5853cc2a | 491 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 492 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
493 | if (error < 0) |
494 | return -ERESTARTSYS; | |
7ee1af76 | 495 | |
0ade640e | 496 | return 0; |
7ee1af76 JA |
497 | } |
498 | ||
fec344e3 JL |
499 | struct mid_q_entry * |
500 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
501 | { |
502 | int rc; | |
fec344e3 | 503 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
504 | struct mid_q_entry *mid; |
505 | ||
506 | /* enable signing if server requires it */ | |
38d77c50 | 507 | if (server->sign) |
792af7b0 PS |
508 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
509 | ||
510 | mid = AllocMidQEntry(hdr, server); | |
511 | if (mid == NULL) | |
fec344e3 | 512 | return ERR_PTR(-ENOMEM); |
792af7b0 | 513 | |
fec344e3 | 514 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
515 | if (rc) { |
516 | DeleteMidQEntry(mid); | |
fec344e3 | 517 | return ERR_PTR(rc); |
ffc61ccb SP |
518 | } |
519 | ||
fec344e3 | 520 | return mid; |
792af7b0 | 521 | } |
133672ef | 522 | |
a6827c18 JL |
523 | /* |
524 | * Send a SMB request and set the callback function in the mid to handle | |
525 | * the result. Caller is responsible for dealing with timeouts. | |
526 | */ | |
527 | int | |
fec344e3 JL |
528 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
529 | mid_receive_t *receive, mid_callback_t *callback, | |
530 | void *cbdata, const int flags) | |
a6827c18 | 531 | { |
a891f0f8 | 532 | int rc, timeout, optype; |
a6827c18 JL |
533 | struct mid_q_entry *mid; |
534 | ||
a891f0f8 PS |
535 | timeout = flags & CIFS_TIMEOUT_MASK; |
536 | optype = flags & CIFS_OP_MASK; | |
537 | ||
538 | rc = wait_for_free_request(server, timeout, optype); | |
a6827c18 JL |
539 | if (rc) |
540 | return rc; | |
541 | ||
542 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
543 | mid = server->ops->setup_async_request(server, rqst); |
544 | if (IS_ERR(mid)) { | |
a6827c18 | 545 | mutex_unlock(&server->srv_mutex); |
a891f0f8 | 546 | add_credits(server, 1, optype); |
0193e072 | 547 | wake_up(&server->request_q); |
fec344e3 | 548 | return PTR_ERR(mid); |
a6827c18 JL |
549 | } |
550 | ||
44d22d84 | 551 | mid->receive = receive; |
a6827c18 JL |
552 | mid->callback = callback; |
553 | mid->callback_data = cbdata; | |
7c9421e1 | 554 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 555 | |
ffc61ccb SP |
556 | /* put it on the pending_mid_q */ |
557 | spin_lock(&GlobalMid_Lock); | |
558 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
559 | spin_unlock(&GlobalMid_Lock); | |
560 | ||
561 | ||
789e6661 | 562 | cifs_in_send_inc(server); |
fec344e3 | 563 | rc = smb_send_rqst(server, rqst); |
789e6661 SF |
564 | cifs_in_send_dec(server); |
565 | cifs_save_when_sent(mid); | |
ad313cb8 JL |
566 | |
567 | if (rc < 0) | |
568 | server->sequence_number -= 2; | |
a6827c18 | 569 | mutex_unlock(&server->srv_mutex); |
789e6661 | 570 | |
ffc61ccb SP |
571 | if (rc == 0) |
572 | return 0; | |
a6827c18 | 573 | |
3c1bf7e4 | 574 | cifs_delete_mid(mid); |
a891f0f8 | 575 | add_credits(server, 1, optype); |
a6827c18 JL |
576 | wake_up(&server->request_q); |
577 | return rc; | |
578 | } | |
579 | ||
133672ef SF |
580 | /* |
581 | * | |
582 | * Send an SMB Request. No response info (other than return code) | |
583 | * needs to be parsed. | |
584 | * | |
585 | * flags indicate the type of request buffer and how long to wait | |
586 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
587 | * | |
588 | */ | |
589 | int | |
96daf2b0 | 590 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 591 | char *in_buf, int flags) |
133672ef SF |
592 | { |
593 | int rc; | |
594 | struct kvec iov[1]; | |
595 | int resp_buf_type; | |
596 | ||
792af7b0 PS |
597 | iov[0].iov_base = in_buf; |
598 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
599 | flags |= CIFS_NO_RESP; |
600 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
f96637be | 601 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 602 | |
133672ef SF |
603 | return rc; |
604 | } | |
605 | ||
053d5034 | 606 | static int |
3c1105df | 607 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
608 | { |
609 | int rc = 0; | |
610 | ||
f96637be JP |
611 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
612 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 613 | |
74dd92a8 | 614 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 615 | switch (mid->mid_state) { |
74dd92a8 | 616 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
617 | spin_unlock(&GlobalMid_Lock); |
618 | return rc; | |
74dd92a8 JL |
619 | case MID_RETRY_NEEDED: |
620 | rc = -EAGAIN; | |
621 | break; | |
71823baf JL |
622 | case MID_RESPONSE_MALFORMED: |
623 | rc = -EIO; | |
624 | break; | |
3c1105df JL |
625 | case MID_SHUTDOWN: |
626 | rc = -EHOSTDOWN; | |
627 | break; | |
74dd92a8 | 628 | default: |
3c1105df | 629 | list_del_init(&mid->qhead); |
f96637be JP |
630 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
631 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 632 | rc = -EIO; |
053d5034 JL |
633 | } |
634 | spin_unlock(&GlobalMid_Lock); | |
635 | ||
2b84a36c | 636 | DeleteMidQEntry(mid); |
053d5034 JL |
637 | return rc; |
638 | } | |
639 | ||
121b046a JL |
640 | static inline int |
641 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 642 | { |
121b046a JL |
643 | return server->ops->send_cancel ? |
644 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
645 | } |
646 | ||
2c8f981d JL |
647 | int |
648 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
649 | bool log_error) | |
650 | { | |
792af7b0 | 651 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
652 | |
653 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
654 | |
655 | /* convert the length into a more usable form */ | |
38d77c50 | 656 | if (server->sign) { |
826a95e4 | 657 | struct kvec iov; |
985e4ff0 | 658 | int rc = 0; |
bf5ea0e2 JL |
659 | struct smb_rqst rqst = { .rq_iov = &iov, |
660 | .rq_nvec = 1 }; | |
826a95e4 JL |
661 | |
662 | iov.iov_base = mid->resp_buf; | |
663 | iov.iov_len = len; | |
2c8f981d | 664 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 665 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 666 | mid->sequence_number); |
985e4ff0 | 667 | if (rc) |
f96637be JP |
668 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
669 | rc); | |
2c8f981d JL |
670 | } |
671 | ||
672 | /* BB special case reconnect tid and uid here? */ | |
673 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
674 | } | |
675 | ||
fec344e3 JL |
676 | struct mid_q_entry * |
677 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
678 | { |
679 | int rc; | |
fec344e3 | 680 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
681 | struct mid_q_entry *mid; |
682 | ||
683 | rc = allocate_mid(ses, hdr, &mid); | |
684 | if (rc) | |
fec344e3 JL |
685 | return ERR_PTR(rc); |
686 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
687 | if (rc) { | |
3c1bf7e4 | 688 | cifs_delete_mid(mid); |
fec344e3 JL |
689 | return ERR_PTR(rc); |
690 | } | |
691 | return mid; | |
792af7b0 PS |
692 | } |
693 | ||
7ee1af76 | 694 | int |
96daf2b0 | 695 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
a891f0f8 | 696 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
133672ef | 697 | const int flags) |
7ee1af76 JA |
698 | { |
699 | int rc = 0; | |
a891f0f8 | 700 | int timeout, optype; |
7ee1af76 | 701 | struct mid_q_entry *midQ; |
792af7b0 | 702 | char *buf = iov[0].iov_base; |
a891f0f8 | 703 | unsigned int credits = 1; |
fec344e3 JL |
704 | struct smb_rqst rqst = { .rq_iov = iov, |
705 | .rq_nvec = n_vec }; | |
50c2f753 | 706 | |
a891f0f8 PS |
707 | timeout = flags & CIFS_TIMEOUT_MASK; |
708 | optype = flags & CIFS_OP_MASK; | |
133672ef | 709 | |
a891f0f8 | 710 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
711 | |
712 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 713 | cifs_small_buf_release(buf); |
f96637be | 714 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
715 | return -EIO; |
716 | } | |
717 | ||
79a58d1f | 718 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 719 | cifs_small_buf_release(buf); |
7ee1af76 JA |
720 | return -ENOENT; |
721 | } | |
722 | ||
792af7b0 PS |
723 | /* |
724 | * Ensure that we do not send more than 50 overlapping requests | |
725 | * to the same server. We may make this configurable later or | |
726 | * use ses->maxReq. | |
727 | */ | |
7ee1af76 | 728 | |
a891f0f8 | 729 | rc = wait_for_free_request(ses->server, timeout, optype); |
7ee1af76 | 730 | if (rc) { |
792af7b0 | 731 | cifs_small_buf_release(buf); |
7ee1af76 JA |
732 | return rc; |
733 | } | |
734 | ||
792af7b0 PS |
735 | /* |
736 | * Make sure that we sign in the same order that we send on this socket | |
737 | * and avoid races inside tcp sendmsg code that could cause corruption | |
738 | * of smb data. | |
739 | */ | |
7ee1af76 | 740 | |
72ca545b | 741 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 742 | |
fec344e3 JL |
743 | midQ = ses->server->ops->setup_request(ses, &rqst); |
744 | if (IS_ERR(midQ)) { | |
72ca545b | 745 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 746 | cifs_small_buf_release(buf); |
7ee1af76 | 747 | /* Update # of requests on wire to server */ |
a891f0f8 | 748 | add_credits(ses->server, 1, optype); |
fec344e3 | 749 | return PTR_ERR(midQ); |
1da177e4 | 750 | } |
1da177e4 | 751 | |
7c9421e1 | 752 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 753 | cifs_in_send_inc(ses->server); |
0496e02d | 754 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
755 | cifs_in_send_dec(ses->server); |
756 | cifs_save_when_sent(midQ); | |
7ee1af76 | 757 | |
ad313cb8 JL |
758 | if (rc < 0) |
759 | ses->server->sequence_number -= 2; | |
72ca545b | 760 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 761 | |
2db7c581 | 762 | if (rc < 0) { |
792af7b0 | 763 | cifs_small_buf_release(buf); |
7ee1af76 | 764 | goto out; |
2db7c581 | 765 | } |
4b8f930f | 766 | |
a891f0f8 | 767 | if (timeout == CIFS_ASYNC_OP) { |
792af7b0 | 768 | cifs_small_buf_release(buf); |
133672ef | 769 | goto out; |
2db7c581 | 770 | } |
d6e04ae6 | 771 | |
0ade640e | 772 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 773 | if (rc != 0) { |
121b046a | 774 | send_cancel(ses->server, buf, midQ); |
1be912dd | 775 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 776 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
777 | midQ->callback = DeleteMidQEntry; |
778 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 779 | cifs_small_buf_release(buf); |
a891f0f8 | 780 | add_credits(ses->server, 1, optype); |
1be912dd JL |
781 | return rc; |
782 | } | |
783 | spin_unlock(&GlobalMid_Lock); | |
784 | } | |
d6e04ae6 | 785 | |
792af7b0 | 786 | cifs_small_buf_release(buf); |
2db7c581 | 787 | |
3c1105df | 788 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 789 | if (rc != 0) { |
a891f0f8 | 790 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
791 | return rc; |
792 | } | |
50c2f753 | 793 | |
7c9421e1 | 794 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 795 | rc = -EIO; |
f96637be | 796 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
797 | goto out; |
798 | } | |
799 | ||
792af7b0 PS |
800 | buf = (char *)midQ->resp_buf; |
801 | iov[0].iov_base = buf; | |
802 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 803 | if (midQ->large_buf) |
a891f0f8 | 804 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 805 | else |
a891f0f8 PS |
806 | *resp_buf_type = CIFS_SMALL_BUFFER; |
807 | ||
808 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 809 | |
082d0642 PS |
810 | rc = ses->server->ops->check_receive(midQ, ses->server, |
811 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 812 | |
3c1bf7e4 | 813 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
814 | if ((flags & CIFS_NO_RESP) == 0) |
815 | midQ->resp_buf = NULL; | |
7ee1af76 | 816 | out: |
3c1bf7e4 | 817 | cifs_delete_mid(midQ); |
a891f0f8 | 818 | add_credits(ses->server, credits, optype); |
1da177e4 | 819 | |
d6e04ae6 SF |
820 | return rc; |
821 | } | |
1da177e4 LT |
822 | |
823 | int | |
96daf2b0 | 824 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 825 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 826 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
827 | { |
828 | int rc = 0; | |
1da177e4 LT |
829 | struct mid_q_entry *midQ; |
830 | ||
831 | if (ses == NULL) { | |
f96637be | 832 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
833 | return -EIO; |
834 | } | |
79a58d1f | 835 | if (ses->server == NULL) { |
f96637be | 836 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
837 | return -EIO; |
838 | } | |
839 | ||
79a58d1f | 840 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
841 | return -ENOENT; |
842 | ||
79a58d1f | 843 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
844 | to the same server. We may make this configurable later or |
845 | use ses->maxReq */ | |
1da177e4 | 846 | |
be8e3b00 SF |
847 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
848 | MAX_CIFS_HDR_SIZE - 4) { | |
f96637be JP |
849 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
850 | be32_to_cpu(in_buf->smb_buf_length)); | |
6d9c6d54 VL |
851 | return -EIO; |
852 | } | |
853 | ||
a891f0f8 | 854 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
855 | if (rc) |
856 | return rc; | |
857 | ||
79a58d1f | 858 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
859 | and avoid races inside tcp sendmsg code that could cause corruption |
860 | of smb data */ | |
861 | ||
72ca545b | 862 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 863 | |
7ee1af76 JA |
864 | rc = allocate_mid(ses, in_buf, &midQ); |
865 | if (rc) { | |
72ca545b | 866 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 867 | /* Update # of requests on wire to server */ |
a891f0f8 | 868 | add_credits(ses->server, 1, 0); |
7ee1af76 | 869 | return rc; |
1da177e4 LT |
870 | } |
871 | ||
ad009ac9 | 872 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
873 | if (rc) { |
874 | mutex_unlock(&ses->server->srv_mutex); | |
875 | goto out; | |
876 | } | |
1da177e4 | 877 | |
7c9421e1 | 878 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
879 | |
880 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 881 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
882 | cifs_in_send_dec(ses->server); |
883 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
884 | |
885 | if (rc < 0) | |
886 | ses->server->sequence_number -= 2; | |
887 | ||
72ca545b | 888 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 889 | |
79a58d1f | 890 | if (rc < 0) |
7ee1af76 JA |
891 | goto out; |
892 | ||
a891f0f8 | 893 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 894 | goto out; |
1da177e4 | 895 | |
0ade640e | 896 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 897 | if (rc != 0) { |
121b046a | 898 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 899 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 900 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
901 | /* no longer considered to be "in-flight" */ |
902 | midQ->callback = DeleteMidQEntry; | |
903 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 904 | add_credits(ses->server, 1, 0); |
1be912dd JL |
905 | return rc; |
906 | } | |
907 | spin_unlock(&GlobalMid_Lock); | |
908 | } | |
1da177e4 | 909 | |
3c1105df | 910 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 911 | if (rc != 0) { |
a891f0f8 | 912 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
913 | return rc; |
914 | } | |
50c2f753 | 915 | |
2c8f981d | 916 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 917 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 918 | rc = -EIO; |
f96637be | 919 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 920 | goto out; |
1da177e4 | 921 | } |
7ee1af76 | 922 | |
d4e4854f | 923 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
924 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
925 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 926 | out: |
3c1bf7e4 | 927 | cifs_delete_mid(midQ); |
a891f0f8 | 928 | add_credits(ses->server, 1, 0); |
1da177e4 | 929 | |
7ee1af76 JA |
930 | return rc; |
931 | } | |
1da177e4 | 932 | |
7ee1af76 JA |
933 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
934 | blocking lock to return. */ | |
935 | ||
936 | static int | |
96daf2b0 | 937 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
938 | struct smb_hdr *in_buf, |
939 | struct smb_hdr *out_buf) | |
940 | { | |
941 | int bytes_returned; | |
96daf2b0 | 942 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
943 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
944 | ||
945 | /* We just modify the current in_buf to change | |
946 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
947 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
948 | LOCKING_ANDX_CANCEL_LOCK. */ | |
949 | ||
950 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
951 | pSMB->Timeout = 0; | |
88257360 | 952 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
953 | |
954 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 955 | &bytes_returned, 0); |
7ee1af76 JA |
956 | } |
957 | ||
958 | int | |
96daf2b0 | 959 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
960 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
961 | int *pbytes_returned) | |
962 | { | |
963 | int rc = 0; | |
964 | int rstart = 0; | |
7ee1af76 | 965 | struct mid_q_entry *midQ; |
96daf2b0 | 966 | struct cifs_ses *ses; |
7ee1af76 JA |
967 | |
968 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 969 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
970 | return -EIO; |
971 | } | |
972 | ses = tcon->ses; | |
973 | ||
79a58d1f | 974 | if (ses->server == NULL) { |
f96637be | 975 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
976 | return -EIO; |
977 | } | |
978 | ||
79a58d1f | 979 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
980 | return -ENOENT; |
981 | ||
79a58d1f | 982 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
983 | to the same server. We may make this configurable later or |
984 | use ses->maxReq */ | |
985 | ||
be8e3b00 SF |
986 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
987 | MAX_CIFS_HDR_SIZE - 4) { | |
f96637be JP |
988 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
989 | be32_to_cpu(in_buf->smb_buf_length)); | |
6d9c6d54 VL |
990 | return -EIO; |
991 | } | |
992 | ||
a891f0f8 | 993 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
994 | if (rc) |
995 | return rc; | |
996 | ||
79a58d1f | 997 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
998 | and avoid races inside tcp sendmsg code that could cause corruption |
999 | of smb data */ | |
1000 | ||
72ca545b | 1001 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1002 | |
1003 | rc = allocate_mid(ses, in_buf, &midQ); | |
1004 | if (rc) { | |
72ca545b | 1005 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1006 | return rc; |
1007 | } | |
1008 | ||
7ee1af76 | 1009 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1010 | if (rc) { |
3c1bf7e4 | 1011 | cifs_delete_mid(midQ); |
829049cb VL |
1012 | mutex_unlock(&ses->server->srv_mutex); |
1013 | return rc; | |
1014 | } | |
1da177e4 | 1015 | |
7c9421e1 | 1016 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1017 | cifs_in_send_inc(ses->server); |
be8e3b00 | 1018 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
1019 | cifs_in_send_dec(ses->server); |
1020 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1021 | |
1022 | if (rc < 0) | |
1023 | ses->server->sequence_number -= 2; | |
1024 | ||
72ca545b | 1025 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1026 | |
79a58d1f | 1027 | if (rc < 0) { |
3c1bf7e4 | 1028 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1029 | return rc; |
1030 | } | |
1031 | ||
1032 | /* Wait for a reply - allow signals to interrupt. */ | |
1033 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1034 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1035 | ((ses->server->tcpStatus != CifsGood) && |
1036 | (ses->server->tcpStatus != CifsNew))); | |
1037 | ||
1038 | /* Were we interrupted by a signal ? */ | |
1039 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1040 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1041 | ((ses->server->tcpStatus == CifsGood) || |
1042 | (ses->server->tcpStatus == CifsNew))) { | |
1043 | ||
1044 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1045 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1046 | blocking lock to return. */ | |
121b046a | 1047 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 1048 | if (rc) { |
3c1bf7e4 | 1049 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1050 | return rc; |
1051 | } | |
1052 | } else { | |
1053 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1054 | to cause the blocking lock to return. */ | |
1055 | ||
1056 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1057 | ||
1058 | /* If we get -ENOLCK back the lock may have | |
1059 | already been removed. Don't exit in this case. */ | |
1060 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1061 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1062 | return rc; |
1063 | } | |
1064 | } | |
1065 | ||
1be912dd JL |
1066 | rc = wait_for_response(ses->server, midQ); |
1067 | if (rc) { | |
121b046a | 1068 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 1069 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1070 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1071 | /* no longer considered to be "in-flight" */ |
1072 | midQ->callback = DeleteMidQEntry; | |
1073 | spin_unlock(&GlobalMid_Lock); | |
1074 | return rc; | |
1075 | } | |
1076 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1077 | } |
1be912dd JL |
1078 | |
1079 | /* We got the response - restart system call. */ | |
1080 | rstart = 1; | |
7ee1af76 JA |
1081 | } |
1082 | ||
3c1105df | 1083 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1084 | if (rc != 0) |
7ee1af76 | 1085 | return rc; |
50c2f753 | 1086 | |
17c8bfed | 1087 | /* rcvd frame is ok */ |
7c9421e1 | 1088 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1089 | rc = -EIO; |
f96637be | 1090 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1091 | goto out; |
1092 | } | |
1da177e4 | 1093 | |
d4e4854f | 1094 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1095 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1096 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1097 | out: |
3c1bf7e4 | 1098 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1099 | if (rstart && rc == -EACCES) |
1100 | return -ERESTARTSYS; | |
1da177e4 LT |
1101 | return rc; |
1102 | } |