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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> |
2f8b5444 | 31 | #include <linux/bvec.h> |
97bc00b3 | 32 | #include <linux/highmem.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/processor.h> |
35 | #include <linux/mempool.h> | |
36 | #include "cifspdu.h" | |
37 | #include "cifsglob.h" | |
38 | #include "cifsproto.h" | |
39 | #include "cifs_debug.h" | |
50c2f753 | 40 | |
2dc7e1c0 PS |
41 | void |
42 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
43 | { |
44 | wake_up_process(mid->callback_data); | |
45 | } | |
46 | ||
a6827c18 | 47 | struct mid_q_entry * |
24b9b06b | 48 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
49 | { |
50 | struct mid_q_entry *temp; | |
51 | ||
24b9b06b | 52 | if (server == NULL) { |
f96637be | 53 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
1da177e4 LT |
54 | return NULL; |
55 | } | |
50c2f753 | 56 | |
232087cb | 57 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
58 | if (temp == NULL) |
59 | return temp; | |
60 | else { | |
26f57364 | 61 | memset(temp, 0, sizeof(struct mid_q_entry)); |
3d378d3f | 62 | temp->mid = get_mid(smb_buffer); |
1da177e4 | 63 | temp->pid = current->pid; |
7c9421e1 | 64 | temp->command = cpu_to_le16(smb_buffer->Command); |
f96637be | 65 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); |
1047abc1 SF |
66 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
67 | /* when mid allocated can be before when sent */ | |
68 | temp->when_alloc = jiffies; | |
2dc7e1c0 | 69 | temp->server = server; |
2b84a36c JL |
70 | |
71 | /* | |
72 | * The default is for the mid to be synchronous, so the | |
73 | * default callback just wakes up the current task. | |
74 | */ | |
2dc7e1c0 | 75 | temp->callback = cifs_wake_up_task; |
2b84a36c | 76 | temp->callback_data = current; |
1da177e4 LT |
77 | } |
78 | ||
1da177e4 | 79 | atomic_inc(&midCount); |
7c9421e1 | 80 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
81 | return temp; |
82 | } | |
83 | ||
766fdbb5 | 84 | void |
1da177e4 LT |
85 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
86 | { | |
1047abc1 | 87 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 88 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
89 | unsigned long now; |
90 | #endif | |
7c9421e1 | 91 | midEntry->mid_state = MID_FREE; |
8097531a | 92 | atomic_dec(&midCount); |
7c9421e1 | 93 | if (midEntry->large_buf) |
b8643e1b SF |
94 | cifs_buf_release(midEntry->resp_buf); |
95 | else | |
96 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
97 | #ifdef CONFIG_CIFS_STATS2 |
98 | now = jiffies; | |
99 | /* commands taking longer than one second are indications that | |
100 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f | 101 | if ((now - midEntry->when_alloc) > HZ) { |
2dc7e1c0 | 102 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
0b456f04 | 103 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 104 | midEntry->command, midEntry->mid); |
0b456f04 | 105 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
106 | now - midEntry->when_alloc, |
107 | now - midEntry->when_sent, | |
108 | now - midEntry->when_received); | |
109 | } | |
110 | } | |
111 | #endif | |
1da177e4 LT |
112 | mempool_free(midEntry, cifs_mid_poolp); |
113 | } | |
114 | ||
3c1bf7e4 PS |
115 | void |
116 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
117 | { |
118 | spin_lock(&GlobalMid_Lock); | |
119 | list_del(&mid->qhead); | |
120 | spin_unlock(&GlobalMid_Lock); | |
121 | ||
122 | DeleteMidQEntry(mid); | |
123 | } | |
124 | ||
6f49f46b JL |
125 | /* |
126 | * smb_send_kvec - send an array of kvecs to the server | |
127 | * @server: Server to send the data to | |
3ab3f2a1 | 128 | * @smb_msg: Message to send |
6f49f46b JL |
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 |
3ab3f2a1 AV |
135 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
136 | size_t *sent) | |
1da177e4 LT |
137 | { |
138 | int rc = 0; | |
3ab3f2a1 | 139 | int retries = 0; |
edf1ae40 | 140 | struct socket *ssocket = server->ssocket; |
50c2f753 | 141 | |
6f49f46b JL |
142 | *sent = 0; |
143 | ||
3ab3f2a1 AV |
144 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
145 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
146 | smb_msg->msg_control = NULL; | |
147 | smb_msg->msg_controllen = 0; | |
0496e02d | 148 | if (server->noblocksnd) |
3ab3f2a1 | 149 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 150 | else |
3ab3f2a1 | 151 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 152 | |
3ab3f2a1 | 153 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
154 | /* |
155 | * If blocking send, we try 3 times, since each can block | |
156 | * for 5 seconds. For nonblocking we have to try more | |
157 | * but wait increasing amounts of time allowing time for | |
158 | * socket to clear. The overall time we wait in either | |
159 | * case to send on the socket is about 15 seconds. | |
160 | * Similarly we wait for 15 seconds for a response from | |
161 | * the server in SendReceive[2] for the server to send | |
162 | * a response back for most types of requests (except | |
163 | * SMB Write past end of file which can be slow, and | |
164 | * blocking lock operations). NFS waits slightly longer | |
165 | * than CIFS, but this can make it take longer for | |
166 | * nonresponsive servers to be detected and 15 seconds | |
167 | * is more than enough time for modern networks to | |
168 | * send a packet. In most cases if we fail to send | |
169 | * after the retries we will kill the socket and | |
170 | * reconnect which may clear the network problem. | |
171 | */ | |
3ab3f2a1 | 172 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 173 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
174 | retries++; |
175 | if (retries >= 14 || | |
176 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
177 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
178 | ssocket); | |
3ab3f2a1 | 179 | return -EAGAIN; |
1da177e4 | 180 | } |
3ab3f2a1 | 181 | msleep(1 << retries); |
1da177e4 LT |
182 | continue; |
183 | } | |
6f49f46b | 184 | |
79a58d1f | 185 | if (rc < 0) |
3ab3f2a1 | 186 | return rc; |
6f49f46b | 187 | |
79a58d1f | 188 | if (rc == 0) { |
3e84469d SF |
189 | /* should never happen, letting socket clear before |
190 | retrying is our only obvious option here */ | |
f96637be | 191 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
192 | msleep(500); |
193 | continue; | |
d6e04ae6 | 194 | } |
6f49f46b | 195 | |
3ab3f2a1 AV |
196 | /* send was at least partially successful */ |
197 | *sent += rc; | |
198 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 199 | } |
3ab3f2a1 | 200 | return 0; |
97bc00b3 JL |
201 | } |
202 | ||
a26054d1 JL |
203 | static unsigned long |
204 | rqst_len(struct smb_rqst *rqst) | |
205 | { | |
206 | unsigned int i; | |
207 | struct kvec *iov = rqst->rq_iov; | |
208 | unsigned long buflen = 0; | |
209 | ||
210 | /* total up iov array first */ | |
211 | for (i = 0; i < rqst->rq_nvec; i++) | |
212 | buflen += iov[i].iov_len; | |
213 | ||
214 | /* add in the page array if there is one */ | |
215 | if (rqst->rq_npages) { | |
216 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1); | |
217 | buflen += rqst->rq_tailsz; | |
218 | } | |
219 | ||
220 | return buflen; | |
221 | } | |
222 | ||
6f49f46b JL |
223 | static int |
224 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
225 | { | |
226 | int rc; | |
227 | struct kvec *iov = rqst->rq_iov; | |
228 | int n_vec = rqst->rq_nvec; | |
229 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
a26054d1 | 230 | unsigned long send_length; |
97bc00b3 | 231 | unsigned int i; |
3ab3f2a1 | 232 | size_t total_len = 0, sent, size; |
b8eed283 | 233 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 234 | struct msghdr smb_msg; |
b8eed283 | 235 | int val = 1; |
6f49f46b | 236 | |
ea702b80 JL |
237 | if (ssocket == NULL) |
238 | return -ENOTSOCK; | |
239 | ||
a26054d1 JL |
240 | /* sanity check send length */ |
241 | send_length = rqst_len(rqst); | |
242 | if (send_length != smb_buf_length + 4) { | |
243 | WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n", | |
244 | send_length, smb_buf_length); | |
245 | return -EIO; | |
246 | } | |
247 | ||
f96637be | 248 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
6f49f46b JL |
249 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
250 | ||
b8eed283 JL |
251 | /* cork the socket */ |
252 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
253 | (char *)&val, sizeof(val)); | |
254 | ||
3ab3f2a1 AV |
255 | size = 0; |
256 | for (i = 0; i < n_vec; i++) | |
257 | size += iov[i].iov_len; | |
258 | ||
259 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size); | |
260 | ||
261 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
97bc00b3 JL |
262 | if (rc < 0) |
263 | goto uncork; | |
264 | ||
265 | total_len += sent; | |
266 | ||
267 | /* now walk the page array and send each page in it */ | |
268 | for (i = 0; i < rqst->rq_npages; i++) { | |
3ab3f2a1 AV |
269 | size_t len = i == rqst->rq_npages - 1 |
270 | ? rqst->rq_tailsz | |
271 | : rqst->rq_pagesz; | |
272 | struct bio_vec bvec = { | |
273 | .bv_page = rqst->rq_pages[i], | |
274 | .bv_len = len | |
275 | }; | |
276 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, | |
277 | &bvec, 1, len); | |
278 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
97bc00b3 JL |
279 | if (rc < 0) |
280 | break; | |
281 | ||
282 | total_len += sent; | |
283 | } | |
1da177e4 | 284 | |
97bc00b3 | 285 | uncork: |
b8eed283 JL |
286 | /* uncork it */ |
287 | val = 0; | |
288 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
289 | (char *)&val, sizeof(val)); | |
290 | ||
edf1ae40 | 291 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
f96637be JP |
292 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
293 | smb_buf_length + 4, total_len); | |
6f49f46b JL |
294 | /* |
295 | * If we have only sent part of an SMB then the next SMB could | |
296 | * be taken as the remainder of this one. We need to kill the | |
297 | * socket so the server throws away the partial SMB | |
298 | */ | |
edf1ae40 SF |
299 | server->tcpStatus = CifsNeedReconnect; |
300 | } | |
301 | ||
d804d41d | 302 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
303 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
304 | rc); | |
d804d41d | 305 | else |
1da177e4 | 306 | rc = 0; |
1da177e4 LT |
307 | |
308 | return rc; | |
309 | } | |
310 | ||
6f49f46b JL |
311 | static int |
312 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) | |
313 | { | |
314 | struct smb_rqst rqst = { .rq_iov = iov, | |
315 | .rq_nvec = n_vec }; | |
316 | ||
317 | return smb_send_rqst(server, &rqst); | |
318 | } | |
319 | ||
0496e02d JL |
320 | int |
321 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
322 | unsigned int smb_buf_length) | |
323 | { | |
324 | struct kvec iov; | |
325 | ||
326 | iov.iov_base = smb_buffer; | |
327 | iov.iov_len = smb_buf_length + 4; | |
328 | ||
329 | return smb_sendv(server, &iov, 1); | |
330 | } | |
331 | ||
fc40f9cf | 332 | static int |
a891f0f8 | 333 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 334 | int *credits) |
1da177e4 | 335 | { |
5bc59498 PS |
336 | int rc; |
337 | ||
fc40f9cf | 338 | spin_lock(&server->req_lock); |
a891f0f8 | 339 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 340 | /* oplock breaks must not be held up */ |
fc40f9cf | 341 | server->in_flight++; |
bc205ed1 | 342 | *credits -= 1; |
fc40f9cf | 343 | spin_unlock(&server->req_lock); |
27a97a61 VL |
344 | return 0; |
345 | } | |
346 | ||
27a97a61 | 347 | while (1) { |
bc205ed1 | 348 | if (*credits <= 0) { |
fc40f9cf | 349 | spin_unlock(&server->req_lock); |
789e6661 | 350 | cifs_num_waiters_inc(server); |
5bc59498 | 351 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 352 | has_credits(server, credits)); |
789e6661 | 353 | cifs_num_waiters_dec(server); |
5bc59498 PS |
354 | if (rc) |
355 | return rc; | |
fc40f9cf | 356 | spin_lock(&server->req_lock); |
27a97a61 | 357 | } else { |
c5797a94 | 358 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 359 | spin_unlock(&server->req_lock); |
27a97a61 | 360 | return -ENOENT; |
1da177e4 | 361 | } |
27a97a61 | 362 | |
2d86dbc9 PS |
363 | /* |
364 | * Can not count locking commands against total | |
365 | * as they are allowed to block on server. | |
366 | */ | |
27a97a61 VL |
367 | |
368 | /* update # of requests on the wire to server */ | |
a891f0f8 | 369 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 370 | *credits -= 1; |
fc40f9cf | 371 | server->in_flight++; |
2d86dbc9 | 372 | } |
fc40f9cf | 373 | spin_unlock(&server->req_lock); |
27a97a61 | 374 | break; |
1da177e4 LT |
375 | } |
376 | } | |
7ee1af76 JA |
377 | return 0; |
378 | } | |
1da177e4 | 379 | |
bc205ed1 | 380 | static int |
a891f0f8 PS |
381 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
382 | const int optype) | |
bc205ed1 | 383 | { |
eb4c7df6 SP |
384 | int *val; |
385 | ||
386 | val = server->ops->get_credits_field(server, optype); | |
387 | /* Since an echo is already inflight, no need to wait to send another */ | |
388 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
389 | return -EAGAIN; | |
390 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
391 | } |
392 | ||
cb7e9eab PS |
393 | int |
394 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
395 | unsigned int *num, unsigned int *credits) | |
396 | { | |
397 | *num = size; | |
398 | *credits = 0; | |
399 | return 0; | |
400 | } | |
401 | ||
96daf2b0 | 402 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
403 | struct mid_q_entry **ppmidQ) |
404 | { | |
1da177e4 | 405 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 406 | return -ENOENT; |
8fbbd365 VL |
407 | } |
408 | ||
409 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 410 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 411 | return -EAGAIN; |
8fbbd365 VL |
412 | } |
413 | ||
7f48558e | 414 | if (ses->status == CifsNew) { |
79a58d1f | 415 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 416 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 417 | return -EAGAIN; |
ad7a2926 | 418 | /* else ok - we are setting up session */ |
1da177e4 | 419 | } |
7f48558e SP |
420 | |
421 | if (ses->status == CifsExiting) { | |
422 | /* check if SMB session is bad because we are setting it up */ | |
423 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
424 | return -EAGAIN; | |
425 | /* else ok - we are shutting down session */ | |
426 | } | |
427 | ||
24b9b06b | 428 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 429 | if (*ppmidQ == NULL) |
7ee1af76 | 430 | return -ENOMEM; |
ddc8cf8f JL |
431 | spin_lock(&GlobalMid_Lock); |
432 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
433 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
434 | return 0; |
435 | } | |
436 | ||
0ade640e JL |
437 | static int |
438 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 439 | { |
0ade640e | 440 | int error; |
7ee1af76 | 441 | |
5853cc2a | 442 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 443 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
444 | if (error < 0) |
445 | return -ERESTARTSYS; | |
7ee1af76 | 446 | |
0ade640e | 447 | return 0; |
7ee1af76 JA |
448 | } |
449 | ||
fec344e3 JL |
450 | struct mid_q_entry * |
451 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
452 | { |
453 | int rc; | |
fec344e3 | 454 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
455 | struct mid_q_entry *mid; |
456 | ||
457 | /* enable signing if server requires it */ | |
38d77c50 | 458 | if (server->sign) |
792af7b0 PS |
459 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
460 | ||
461 | mid = AllocMidQEntry(hdr, server); | |
462 | if (mid == NULL) | |
fec344e3 | 463 | return ERR_PTR(-ENOMEM); |
792af7b0 | 464 | |
fec344e3 | 465 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
466 | if (rc) { |
467 | DeleteMidQEntry(mid); | |
fec344e3 | 468 | return ERR_PTR(rc); |
ffc61ccb SP |
469 | } |
470 | ||
fec344e3 | 471 | return mid; |
792af7b0 | 472 | } |
133672ef | 473 | |
a6827c18 JL |
474 | /* |
475 | * Send a SMB request and set the callback function in the mid to handle | |
476 | * the result. Caller is responsible for dealing with timeouts. | |
477 | */ | |
478 | int | |
fec344e3 JL |
479 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
480 | mid_receive_t *receive, mid_callback_t *callback, | |
481 | void *cbdata, const int flags) | |
a6827c18 | 482 | { |
a891f0f8 | 483 | int rc, timeout, optype; |
a6827c18 | 484 | struct mid_q_entry *mid; |
cb7e9eab | 485 | unsigned int credits = 0; |
a6827c18 | 486 | |
a891f0f8 PS |
487 | timeout = flags & CIFS_TIMEOUT_MASK; |
488 | optype = flags & CIFS_OP_MASK; | |
489 | ||
cb7e9eab PS |
490 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
491 | rc = wait_for_free_request(server, timeout, optype); | |
492 | if (rc) | |
493 | return rc; | |
494 | credits = 1; | |
495 | } | |
a6827c18 JL |
496 | |
497 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
498 | mid = server->ops->setup_async_request(server, rqst); |
499 | if (IS_ERR(mid)) { | |
a6827c18 | 500 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 501 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 502 | return PTR_ERR(mid); |
a6827c18 JL |
503 | } |
504 | ||
44d22d84 | 505 | mid->receive = receive; |
a6827c18 JL |
506 | mid->callback = callback; |
507 | mid->callback_data = cbdata; | |
7c9421e1 | 508 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 509 | |
ffc61ccb SP |
510 | /* put it on the pending_mid_q */ |
511 | spin_lock(&GlobalMid_Lock); | |
512 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
513 | spin_unlock(&GlobalMid_Lock); | |
514 | ||
515 | ||
789e6661 | 516 | cifs_in_send_inc(server); |
fec344e3 | 517 | rc = smb_send_rqst(server, rqst); |
789e6661 SF |
518 | cifs_in_send_dec(server); |
519 | cifs_save_when_sent(mid); | |
ad313cb8 | 520 | |
820962dc | 521 | if (rc < 0) { |
ad313cb8 | 522 | server->sequence_number -= 2; |
820962dc RV |
523 | cifs_delete_mid(mid); |
524 | } | |
525 | ||
a6827c18 | 526 | mutex_unlock(&server->srv_mutex); |
789e6661 | 527 | |
ffc61ccb SP |
528 | if (rc == 0) |
529 | return 0; | |
a6827c18 | 530 | |
cb7e9eab | 531 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
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); | |
f96637be | 556 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", 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 | ||
f96637be JP |
566 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
567 | __func__, 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); |
f96637be JP |
585 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
586 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 587 | rc = -EIO; |
053d5034 JL |
588 | } |
589 | spin_unlock(&GlobalMid_Lock); | |
590 | ||
5fb4e288 | 591 | mutex_lock(&server->srv_mutex); |
2b84a36c | 592 | DeleteMidQEntry(mid); |
5fb4e288 | 593 | mutex_unlock(&server->srv_mutex); |
053d5034 JL |
594 | return rc; |
595 | } | |
596 | ||
121b046a JL |
597 | static inline int |
598 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 599 | { |
121b046a JL |
600 | return server->ops->send_cancel ? |
601 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
602 | } |
603 | ||
2c8f981d JL |
604 | int |
605 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
606 | bool log_error) | |
607 | { | |
792af7b0 | 608 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
609 | |
610 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
611 | |
612 | /* convert the length into a more usable form */ | |
38d77c50 | 613 | if (server->sign) { |
826a95e4 | 614 | struct kvec iov; |
985e4ff0 | 615 | int rc = 0; |
bf5ea0e2 JL |
616 | struct smb_rqst rqst = { .rq_iov = &iov, |
617 | .rq_nvec = 1 }; | |
826a95e4 JL |
618 | |
619 | iov.iov_base = mid->resp_buf; | |
620 | iov.iov_len = len; | |
2c8f981d | 621 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 622 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 623 | mid->sequence_number); |
985e4ff0 | 624 | if (rc) |
f96637be JP |
625 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
626 | rc); | |
2c8f981d JL |
627 | } |
628 | ||
629 | /* BB special case reconnect tid and uid here? */ | |
630 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
631 | } | |
632 | ||
fec344e3 JL |
633 | struct mid_q_entry * |
634 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
635 | { |
636 | int rc; | |
fec344e3 | 637 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
638 | struct mid_q_entry *mid; |
639 | ||
640 | rc = allocate_mid(ses, hdr, &mid); | |
641 | if (rc) | |
fec344e3 JL |
642 | return ERR_PTR(rc); |
643 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
644 | if (rc) { | |
3c1bf7e4 | 645 | cifs_delete_mid(mid); |
fec344e3 JL |
646 | return ERR_PTR(rc); |
647 | } | |
648 | return mid; | |
792af7b0 PS |
649 | } |
650 | ||
7ee1af76 | 651 | int |
96daf2b0 | 652 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
a891f0f8 | 653 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
133672ef | 654 | const int flags) |
7ee1af76 JA |
655 | { |
656 | int rc = 0; | |
a891f0f8 | 657 | int timeout, optype; |
7ee1af76 | 658 | struct mid_q_entry *midQ; |
792af7b0 | 659 | char *buf = iov[0].iov_base; |
a891f0f8 | 660 | unsigned int credits = 1; |
fec344e3 JL |
661 | struct smb_rqst rqst = { .rq_iov = iov, |
662 | .rq_nvec = n_vec }; | |
50c2f753 | 663 | |
a891f0f8 PS |
664 | timeout = flags & CIFS_TIMEOUT_MASK; |
665 | optype = flags & CIFS_OP_MASK; | |
133672ef | 666 | |
a891f0f8 | 667 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
668 | |
669 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 670 | cifs_small_buf_release(buf); |
f96637be | 671 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
672 | return -EIO; |
673 | } | |
674 | ||
79a58d1f | 675 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 676 | cifs_small_buf_release(buf); |
7ee1af76 JA |
677 | return -ENOENT; |
678 | } | |
679 | ||
792af7b0 PS |
680 | /* |
681 | * Ensure that we do not send more than 50 overlapping requests | |
682 | * to the same server. We may make this configurable later or | |
683 | * use ses->maxReq. | |
684 | */ | |
7ee1af76 | 685 | |
a891f0f8 | 686 | rc = wait_for_free_request(ses->server, timeout, optype); |
7ee1af76 | 687 | if (rc) { |
792af7b0 | 688 | cifs_small_buf_release(buf); |
7ee1af76 JA |
689 | return rc; |
690 | } | |
691 | ||
792af7b0 PS |
692 | /* |
693 | * Make sure that we sign in the same order that we send on this socket | |
694 | * and avoid races inside tcp sendmsg code that could cause corruption | |
695 | * of smb data. | |
696 | */ | |
7ee1af76 | 697 | |
72ca545b | 698 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 699 | |
fec344e3 JL |
700 | midQ = ses->server->ops->setup_request(ses, &rqst); |
701 | if (IS_ERR(midQ)) { | |
72ca545b | 702 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 703 | cifs_small_buf_release(buf); |
7ee1af76 | 704 | /* Update # of requests on wire to server */ |
a891f0f8 | 705 | add_credits(ses->server, 1, optype); |
fec344e3 | 706 | return PTR_ERR(midQ); |
1da177e4 | 707 | } |
1da177e4 | 708 | |
7c9421e1 | 709 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 710 | cifs_in_send_inc(ses->server); |
0496e02d | 711 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
712 | cifs_in_send_dec(ses->server); |
713 | cifs_save_when_sent(midQ); | |
7ee1af76 | 714 | |
ad313cb8 JL |
715 | if (rc < 0) |
716 | ses->server->sequence_number -= 2; | |
72ca545b | 717 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 718 | |
2db7c581 | 719 | if (rc < 0) { |
792af7b0 | 720 | cifs_small_buf_release(buf); |
7ee1af76 | 721 | goto out; |
2db7c581 | 722 | } |
4b8f930f | 723 | |
a891f0f8 | 724 | if (timeout == CIFS_ASYNC_OP) { |
792af7b0 | 725 | cifs_small_buf_release(buf); |
133672ef | 726 | goto out; |
2db7c581 | 727 | } |
d6e04ae6 | 728 | |
0ade640e | 729 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 730 | if (rc != 0) { |
121b046a | 731 | send_cancel(ses->server, buf, midQ); |
1be912dd | 732 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 733 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
734 | midQ->callback = DeleteMidQEntry; |
735 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 736 | cifs_small_buf_release(buf); |
a891f0f8 | 737 | add_credits(ses->server, 1, optype); |
1be912dd JL |
738 | return rc; |
739 | } | |
740 | spin_unlock(&GlobalMid_Lock); | |
741 | } | |
d6e04ae6 | 742 | |
792af7b0 | 743 | cifs_small_buf_release(buf); |
2db7c581 | 744 | |
3c1105df | 745 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 746 | if (rc != 0) { |
a891f0f8 | 747 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
748 | return rc; |
749 | } | |
50c2f753 | 750 | |
7c9421e1 | 751 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 752 | rc = -EIO; |
f96637be | 753 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
754 | goto out; |
755 | } | |
756 | ||
792af7b0 PS |
757 | buf = (char *)midQ->resp_buf; |
758 | iov[0].iov_base = buf; | |
759 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 760 | if (midQ->large_buf) |
a891f0f8 | 761 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 762 | else |
a891f0f8 PS |
763 | *resp_buf_type = CIFS_SMALL_BUFFER; |
764 | ||
765 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 766 | |
082d0642 PS |
767 | rc = ses->server->ops->check_receive(midQ, ses->server, |
768 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 769 | |
3c1bf7e4 | 770 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
771 | if ((flags & CIFS_NO_RESP) == 0) |
772 | midQ->resp_buf = NULL; | |
7ee1af76 | 773 | out: |
3c1bf7e4 | 774 | cifs_delete_mid(midQ); |
a891f0f8 | 775 | add_credits(ses->server, credits, optype); |
1da177e4 | 776 | |
d6e04ae6 SF |
777 | return rc; |
778 | } | |
1da177e4 LT |
779 | |
780 | int | |
96daf2b0 | 781 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 782 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 783 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
784 | { |
785 | int rc = 0; | |
1da177e4 LT |
786 | struct mid_q_entry *midQ; |
787 | ||
788 | if (ses == NULL) { | |
f96637be | 789 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
790 | return -EIO; |
791 | } | |
79a58d1f | 792 | if (ses->server == NULL) { |
f96637be | 793 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
794 | return -EIO; |
795 | } | |
796 | ||
79a58d1f | 797 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
798 | return -ENOENT; |
799 | ||
79a58d1f | 800 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
801 | to the same server. We may make this configurable later or |
802 | use ses->maxReq */ | |
1da177e4 | 803 | |
be8e3b00 SF |
804 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
805 | MAX_CIFS_HDR_SIZE - 4) { | |
f96637be JP |
806 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
807 | be32_to_cpu(in_buf->smb_buf_length)); | |
6d9c6d54 VL |
808 | return -EIO; |
809 | } | |
810 | ||
a891f0f8 | 811 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
812 | if (rc) |
813 | return rc; | |
814 | ||
79a58d1f | 815 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
816 | and avoid races inside tcp sendmsg code that could cause corruption |
817 | of smb data */ | |
818 | ||
72ca545b | 819 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 820 | |
7ee1af76 JA |
821 | rc = allocate_mid(ses, in_buf, &midQ); |
822 | if (rc) { | |
72ca545b | 823 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 824 | /* Update # of requests on wire to server */ |
a891f0f8 | 825 | add_credits(ses->server, 1, 0); |
7ee1af76 | 826 | return rc; |
1da177e4 LT |
827 | } |
828 | ||
ad009ac9 | 829 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
830 | if (rc) { |
831 | mutex_unlock(&ses->server->srv_mutex); | |
832 | goto out; | |
833 | } | |
1da177e4 | 834 | |
7c9421e1 | 835 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
836 | |
837 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 838 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
839 | cifs_in_send_dec(ses->server); |
840 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
841 | |
842 | if (rc < 0) | |
843 | ses->server->sequence_number -= 2; | |
844 | ||
72ca545b | 845 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 846 | |
79a58d1f | 847 | if (rc < 0) |
7ee1af76 JA |
848 | goto out; |
849 | ||
a891f0f8 | 850 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 851 | goto out; |
1da177e4 | 852 | |
0ade640e | 853 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 854 | if (rc != 0) { |
121b046a | 855 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 856 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 857 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
858 | /* no longer considered to be "in-flight" */ |
859 | midQ->callback = DeleteMidQEntry; | |
860 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 861 | add_credits(ses->server, 1, 0); |
1be912dd JL |
862 | return rc; |
863 | } | |
864 | spin_unlock(&GlobalMid_Lock); | |
865 | } | |
1da177e4 | 866 | |
3c1105df | 867 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 868 | if (rc != 0) { |
a891f0f8 | 869 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
870 | return rc; |
871 | } | |
50c2f753 | 872 | |
2c8f981d | 873 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 874 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 875 | rc = -EIO; |
f96637be | 876 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 877 | goto out; |
1da177e4 | 878 | } |
7ee1af76 | 879 | |
d4e4854f | 880 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
881 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
882 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 883 | out: |
3c1bf7e4 | 884 | cifs_delete_mid(midQ); |
a891f0f8 | 885 | add_credits(ses->server, 1, 0); |
1da177e4 | 886 | |
7ee1af76 JA |
887 | return rc; |
888 | } | |
1da177e4 | 889 | |
7ee1af76 JA |
890 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
891 | blocking lock to return. */ | |
892 | ||
893 | static int | |
96daf2b0 | 894 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
895 | struct smb_hdr *in_buf, |
896 | struct smb_hdr *out_buf) | |
897 | { | |
898 | int bytes_returned; | |
96daf2b0 | 899 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
900 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
901 | ||
902 | /* We just modify the current in_buf to change | |
903 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
904 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
905 | LOCKING_ANDX_CANCEL_LOCK. */ | |
906 | ||
907 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
908 | pSMB->Timeout = 0; | |
88257360 | 909 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
910 | |
911 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 912 | &bytes_returned, 0); |
7ee1af76 JA |
913 | } |
914 | ||
915 | int | |
96daf2b0 | 916 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
917 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
918 | int *pbytes_returned) | |
919 | { | |
920 | int rc = 0; | |
921 | int rstart = 0; | |
7ee1af76 | 922 | struct mid_q_entry *midQ; |
96daf2b0 | 923 | struct cifs_ses *ses; |
7ee1af76 JA |
924 | |
925 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 926 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
927 | return -EIO; |
928 | } | |
929 | ses = tcon->ses; | |
930 | ||
79a58d1f | 931 | if (ses->server == NULL) { |
f96637be | 932 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
933 | return -EIO; |
934 | } | |
935 | ||
79a58d1f | 936 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
937 | return -ENOENT; |
938 | ||
79a58d1f | 939 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
940 | to the same server. We may make this configurable later or |
941 | use ses->maxReq */ | |
942 | ||
be8e3b00 SF |
943 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
944 | MAX_CIFS_HDR_SIZE - 4) { | |
f96637be JP |
945 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
946 | be32_to_cpu(in_buf->smb_buf_length)); | |
6d9c6d54 VL |
947 | return -EIO; |
948 | } | |
949 | ||
a891f0f8 | 950 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
951 | if (rc) |
952 | return rc; | |
953 | ||
79a58d1f | 954 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
955 | and avoid races inside tcp sendmsg code that could cause corruption |
956 | of smb data */ | |
957 | ||
72ca545b | 958 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
959 | |
960 | rc = allocate_mid(ses, in_buf, &midQ); | |
961 | if (rc) { | |
72ca545b | 962 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
963 | return rc; |
964 | } | |
965 | ||
7ee1af76 | 966 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 967 | if (rc) { |
3c1bf7e4 | 968 | cifs_delete_mid(midQ); |
829049cb VL |
969 | mutex_unlock(&ses->server->srv_mutex); |
970 | return rc; | |
971 | } | |
1da177e4 | 972 | |
7c9421e1 | 973 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 974 | cifs_in_send_inc(ses->server); |
be8e3b00 | 975 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
976 | cifs_in_send_dec(ses->server); |
977 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
978 | |
979 | if (rc < 0) | |
980 | ses->server->sequence_number -= 2; | |
981 | ||
72ca545b | 982 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 983 | |
79a58d1f | 984 | if (rc < 0) { |
3c1bf7e4 | 985 | cifs_delete_mid(midQ); |
7ee1af76 JA |
986 | return rc; |
987 | } | |
988 | ||
989 | /* Wait for a reply - allow signals to interrupt. */ | |
990 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 991 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
992 | ((ses->server->tcpStatus != CifsGood) && |
993 | (ses->server->tcpStatus != CifsNew))); | |
994 | ||
995 | /* Were we interrupted by a signal ? */ | |
996 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 997 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
998 | ((ses->server->tcpStatus == CifsGood) || |
999 | (ses->server->tcpStatus == CifsNew))) { | |
1000 | ||
1001 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1002 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1003 | blocking lock to return. */ | |
121b046a | 1004 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 1005 | if (rc) { |
3c1bf7e4 | 1006 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1007 | return rc; |
1008 | } | |
1009 | } else { | |
1010 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1011 | to cause the blocking lock to return. */ | |
1012 | ||
1013 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1014 | ||
1015 | /* If we get -ENOLCK back the lock may have | |
1016 | already been removed. Don't exit in this case. */ | |
1017 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1018 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1019 | return rc; |
1020 | } | |
1021 | } | |
1022 | ||
1be912dd JL |
1023 | rc = wait_for_response(ses->server, midQ); |
1024 | if (rc) { | |
121b046a | 1025 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 1026 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1027 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1028 | /* no longer considered to be "in-flight" */ |
1029 | midQ->callback = DeleteMidQEntry; | |
1030 | spin_unlock(&GlobalMid_Lock); | |
1031 | return rc; | |
1032 | } | |
1033 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1034 | } |
1be912dd JL |
1035 | |
1036 | /* We got the response - restart system call. */ | |
1037 | rstart = 1; | |
7ee1af76 JA |
1038 | } |
1039 | ||
3c1105df | 1040 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1041 | if (rc != 0) |
7ee1af76 | 1042 | return rc; |
50c2f753 | 1043 | |
17c8bfed | 1044 | /* rcvd frame is ok */ |
7c9421e1 | 1045 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1046 | rc = -EIO; |
f96637be | 1047 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1048 | goto out; |
1049 | } | |
1da177e4 | 1050 | |
d4e4854f | 1051 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1052 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1053 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1054 | out: |
3c1bf7e4 | 1055 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1056 | if (rstart && rc == -EACCES) |
1057 | return -ERESTARTSYS; | |
1da177e4 LT |
1058 | return rc; |
1059 | } |