Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
33 | #include "cifspdu.h" | |
34 | #include "cifsglob.h" | |
35 | #include "cifsproto.h" | |
36 | #include "cifs_debug.h" | |
50c2f753 | 37 | |
2dc7e1c0 PS |
38 | void |
39 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
40 | { |
41 | wake_up_process(mid->callback_data); | |
42 | } | |
43 | ||
a6827c18 | 44 | struct mid_q_entry * |
24b9b06b | 45 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
46 | { |
47 | struct mid_q_entry *temp; | |
48 | ||
24b9b06b | 49 | if (server == NULL) { |
b6b38f70 | 50 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
51 | return NULL; |
52 | } | |
50c2f753 | 53 | |
232087cb | 54 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
55 | if (temp == NULL) |
56 | return temp; | |
57 | else { | |
26f57364 | 58 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
59 | temp->mid = smb_buffer->Mid; /* always LE */ |
60 | temp->pid = current->pid; | |
7c9421e1 PS |
61 | temp->command = cpu_to_le16(smb_buffer->Command); |
62 | cFYI(1, "For smb_command %d", smb_buffer->Command); | |
1047abc1 SF |
63 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
64 | /* when mid allocated can be before when sent */ | |
65 | temp->when_alloc = jiffies; | |
2dc7e1c0 | 66 | temp->server = server; |
2b84a36c JL |
67 | |
68 | /* | |
69 | * The default is for the mid to be synchronous, so the | |
70 | * default callback just wakes up the current task. | |
71 | */ | |
2dc7e1c0 | 72 | temp->callback = cifs_wake_up_task; |
2b84a36c | 73 | temp->callback_data = current; |
1da177e4 LT |
74 | } |
75 | ||
1da177e4 | 76 | atomic_inc(&midCount); |
7c9421e1 | 77 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
78 | return temp; |
79 | } | |
80 | ||
766fdbb5 | 81 | void |
1da177e4 LT |
82 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
83 | { | |
1047abc1 | 84 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 85 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
86 | unsigned long now; |
87 | #endif | |
7c9421e1 | 88 | midEntry->mid_state = MID_FREE; |
8097531a | 89 | atomic_dec(&midCount); |
7c9421e1 | 90 | if (midEntry->large_buf) |
b8643e1b SF |
91 | cifs_buf_release(midEntry->resp_buf); |
92 | else | |
93 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
94 | #ifdef CONFIG_CIFS_STATS2 |
95 | now = jiffies; | |
96 | /* commands taking longer than one second are indications that | |
97 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f | 98 | if ((now - midEntry->when_alloc) > HZ) { |
2dc7e1c0 | 99 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
7c9421e1 | 100 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", |
1047abc1 SF |
101 | midEntry->command, midEntry->mid); |
102 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
103 | now - midEntry->when_alloc, | |
104 | now - midEntry->when_sent, | |
105 | now - midEntry->when_received); | |
106 | } | |
107 | } | |
108 | #endif | |
1da177e4 LT |
109 | mempool_free(midEntry, cifs_mid_poolp); |
110 | } | |
111 | ||
ddc8cf8f JL |
112 | static void |
113 | delete_mid(struct mid_q_entry *mid) | |
114 | { | |
115 | spin_lock(&GlobalMid_Lock); | |
116 | list_del(&mid->qhead); | |
117 | spin_unlock(&GlobalMid_Lock); | |
118 | ||
119 | DeleteMidQEntry(mid); | |
120 | } | |
121 | ||
d6e04ae6 | 122 | static int |
0496e02d | 123 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
124 | { |
125 | int rc = 0; | |
126 | int i = 0; | |
127 | struct msghdr smb_msg; | |
3e84469d SF |
128 | unsigned int len = iov[0].iov_len; |
129 | unsigned int total_len; | |
130 | int first_vec = 0; | |
792af7b0 | 131 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
edf1ae40 | 132 | struct socket *ssocket = server->ssocket; |
50c2f753 | 133 | |
79a58d1f | 134 | if (ssocket == NULL) |
1da177e4 | 135 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 136 | |
a9f1b85e | 137 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 138 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
139 | smb_msg.msg_control = NULL; |
140 | smb_msg.msg_controllen = 0; | |
0496e02d | 141 | if (server->noblocksnd) |
edf1ae40 SF |
142 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
143 | else | |
144 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 145 | |
3e84469d SF |
146 | total_len = 0; |
147 | for (i = 0; i < n_vec; i++) | |
148 | total_len += iov[i].iov_len; | |
149 | ||
b6b38f70 | 150 | cFYI(1, "Sending smb: total_len %d", total_len); |
792af7b0 | 151 | dump_smb(iov[0].iov_base, len); |
1da177e4 | 152 | |
17680356 | 153 | i = 0; |
3e84469d SF |
154 | while (total_len) { |
155 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
156 | n_vec - first_vec, total_len); | |
1da177e4 LT |
157 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
158 | i++; | |
792af7b0 PS |
159 | /* |
160 | * If blocking send we try 3 times, since each can block | |
161 | * for 5 seconds. For nonblocking we have to try more | |
162 | * but wait increasing amounts of time allowing time for | |
163 | * socket to clear. The overall time we wait in either | |
164 | * case to send on the socket is about 15 seconds. | |
165 | * Similarly we wait for 15 seconds for a response from | |
166 | * the server in SendReceive[2] for the server to send | |
167 | * a response back for most types of requests (except | |
168 | * SMB Write past end of file which can be slow, and | |
169 | * blocking lock operations). NFS waits slightly longer | |
170 | * than CIFS, but this can make it take longer for | |
171 | * nonresponsive servers to be detected and 15 seconds | |
172 | * is more than enough time for modern networks to | |
173 | * send a packet. In most cases if we fail to send | |
174 | * after the retries we will kill the socket and | |
175 | * reconnect which may clear the network problem. | |
176 | */ | |
da505c38 | 177 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { |
b6b38f70 JP |
178 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
179 | ssocket); | |
1da177e4 LT |
180 | rc = -EAGAIN; |
181 | break; | |
182 | } | |
68058e75 | 183 | msleep(1 << i); |
1da177e4 LT |
184 | continue; |
185 | } | |
79a58d1f | 186 | if (rc < 0) |
1da177e4 | 187 | break; |
3e84469d | 188 | |
61de800d SF |
189 | if (rc == total_len) { |
190 | total_len = 0; | |
191 | break; | |
192 | } else if (rc > total_len) { | |
b6b38f70 | 193 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
194 | break; |
195 | } | |
79a58d1f | 196 | if (rc == 0) { |
3e84469d SF |
197 | /* should never happen, letting socket clear before |
198 | retrying is our only obvious option here */ | |
b6b38f70 | 199 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
200 | msleep(500); |
201 | continue; | |
d6e04ae6 | 202 | } |
3e84469d | 203 | total_len -= rc; |
68058e75 | 204 | /* the line below resets i */ |
3e84469d SF |
205 | for (i = first_vec; i < n_vec; i++) { |
206 | if (iov[i].iov_len) { | |
207 | if (rc > iov[i].iov_len) { | |
208 | rc -= iov[i].iov_len; | |
209 | iov[i].iov_len = 0; | |
210 | } else { | |
211 | iov[i].iov_base += rc; | |
212 | iov[i].iov_len -= rc; | |
213 | first_vec = i; | |
214 | break; | |
215 | } | |
216 | } | |
d6e04ae6 | 217 | } |
5e1253b5 | 218 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
219 | } |
220 | ||
edf1ae40 | 221 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
222 | cFYI(1, "partial send (%d remaining), terminating session", |
223 | total_len); | |
edf1ae40 SF |
224 | /* If we have only sent part of an SMB then the next SMB |
225 | could be taken as the remainder of this one. We need | |
226 | to kill the socket so the server throws away the partial | |
227 | SMB */ | |
228 | server->tcpStatus = CifsNeedReconnect; | |
229 | } | |
230 | ||
d804d41d | 231 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 232 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 233 | else |
1da177e4 | 234 | rc = 0; |
1da177e4 LT |
235 | |
236 | return rc; | |
237 | } | |
238 | ||
0496e02d JL |
239 | int |
240 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
241 | unsigned int smb_buf_length) | |
242 | { | |
243 | struct kvec iov; | |
244 | ||
245 | iov.iov_base = smb_buffer; | |
246 | iov.iov_len = smb_buf_length + 4; | |
247 | ||
248 | return smb_sendv(server, &iov, 1); | |
249 | } | |
250 | ||
fc40f9cf | 251 | static int |
a891f0f8 | 252 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 253 | int *credits) |
1da177e4 | 254 | { |
5bc59498 PS |
255 | int rc; |
256 | ||
fc40f9cf | 257 | spin_lock(&server->req_lock); |
a891f0f8 | 258 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 259 | /* oplock breaks must not be held up */ |
fc40f9cf | 260 | server->in_flight++; |
bc205ed1 | 261 | *credits -= 1; |
fc40f9cf | 262 | spin_unlock(&server->req_lock); |
27a97a61 VL |
263 | return 0; |
264 | } | |
265 | ||
27a97a61 | 266 | while (1) { |
bc205ed1 | 267 | if (*credits <= 0) { |
fc40f9cf | 268 | spin_unlock(&server->req_lock); |
789e6661 | 269 | cifs_num_waiters_inc(server); |
5bc59498 | 270 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 271 | has_credits(server, credits)); |
789e6661 | 272 | cifs_num_waiters_dec(server); |
5bc59498 PS |
273 | if (rc) |
274 | return rc; | |
fc40f9cf | 275 | spin_lock(&server->req_lock); |
27a97a61 | 276 | } else { |
c5797a94 | 277 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 278 | spin_unlock(&server->req_lock); |
27a97a61 | 279 | return -ENOENT; |
1da177e4 | 280 | } |
27a97a61 | 281 | |
2d86dbc9 PS |
282 | /* |
283 | * Can not count locking commands against total | |
284 | * as they are allowed to block on server. | |
285 | */ | |
27a97a61 VL |
286 | |
287 | /* update # of requests on the wire to server */ | |
a891f0f8 | 288 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 289 | *credits -= 1; |
fc40f9cf | 290 | server->in_flight++; |
2d86dbc9 | 291 | } |
fc40f9cf | 292 | spin_unlock(&server->req_lock); |
27a97a61 | 293 | break; |
1da177e4 LT |
294 | } |
295 | } | |
7ee1af76 JA |
296 | return 0; |
297 | } | |
1da177e4 | 298 | |
bc205ed1 | 299 | static int |
a891f0f8 PS |
300 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
301 | const int optype) | |
bc205ed1 | 302 | { |
a891f0f8 PS |
303 | return wait_for_free_credits(server, timeout, |
304 | server->ops->get_credits_field(server, optype)); | |
bc205ed1 PS |
305 | } |
306 | ||
96daf2b0 | 307 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
308 | struct mid_q_entry **ppmidQ) |
309 | { | |
1da177e4 | 310 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 311 | return -ENOENT; |
8fbbd365 VL |
312 | } |
313 | ||
314 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 315 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 316 | return -EAGAIN; |
8fbbd365 VL |
317 | } |
318 | ||
319 | if (ses->status != CifsGood) { | |
1da177e4 | 320 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 321 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 322 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 323 | return -EAGAIN; |
ad7a2926 | 324 | /* else ok - we are setting up session */ |
1da177e4 | 325 | } |
24b9b06b | 326 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 327 | if (*ppmidQ == NULL) |
7ee1af76 | 328 | return -ENOMEM; |
ddc8cf8f JL |
329 | spin_lock(&GlobalMid_Lock); |
330 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
331 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
332 | return 0; |
333 | } | |
334 | ||
0ade640e JL |
335 | static int |
336 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 337 | { |
0ade640e | 338 | int error; |
7ee1af76 | 339 | |
f06ac72e | 340 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 341 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
342 | if (error < 0) |
343 | return -ERESTARTSYS; | |
7ee1af76 | 344 | |
0ade640e | 345 | return 0; |
7ee1af76 JA |
346 | } |
347 | ||
45740847 | 348 | int |
792af7b0 PS |
349 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, |
350 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
351 | { | |
352 | int rc; | |
353 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
354 | struct mid_q_entry *mid; | |
355 | ||
356 | /* enable signing if server requires it */ | |
357 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
358 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
359 | ||
360 | mid = AllocMidQEntry(hdr, server); | |
361 | if (mid == NULL) | |
362 | return -ENOMEM; | |
363 | ||
762a4206 | 364 | rc = cifs_sign_smbv(iov, nvec, server, &mid->sequence_number); |
ffc61ccb SP |
365 | if (rc) { |
366 | DeleteMidQEntry(mid); | |
367 | return rc; | |
368 | } | |
369 | ||
792af7b0 | 370 | *ret_mid = mid; |
ffc61ccb | 371 | return 0; |
792af7b0 | 372 | } |
133672ef | 373 | |
a6827c18 JL |
374 | /* |
375 | * Send a SMB request and set the callback function in the mid to handle | |
376 | * the result. Caller is responsible for dealing with timeouts. | |
377 | */ | |
378 | int | |
fcc31cb6 | 379 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 | 380 | unsigned int nvec, mid_receive_t *receive, |
a891f0f8 | 381 | mid_callback_t *callback, void *cbdata, const int flags) |
a6827c18 | 382 | { |
a891f0f8 | 383 | int rc, timeout, optype; |
a6827c18 JL |
384 | struct mid_q_entry *mid; |
385 | ||
a891f0f8 PS |
386 | timeout = flags & CIFS_TIMEOUT_MASK; |
387 | optype = flags & CIFS_OP_MASK; | |
388 | ||
389 | rc = wait_for_free_request(server, timeout, optype); | |
a6827c18 JL |
390 | if (rc) |
391 | return rc; | |
392 | ||
393 | mutex_lock(&server->srv_mutex); | |
45740847 | 394 | rc = server->ops->setup_async_request(server, iov, nvec, &mid); |
792af7b0 | 395 | if (rc) { |
a6827c18 | 396 | mutex_unlock(&server->srv_mutex); |
a891f0f8 | 397 | add_credits(server, 1, optype); |
0193e072 | 398 | wake_up(&server->request_q); |
792af7b0 | 399 | return rc; |
a6827c18 JL |
400 | } |
401 | ||
44d22d84 | 402 | mid->receive = receive; |
a6827c18 JL |
403 | mid->callback = callback; |
404 | mid->callback_data = cbdata; | |
7c9421e1 | 405 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 406 | |
ffc61ccb SP |
407 | /* put it on the pending_mid_q */ |
408 | spin_lock(&GlobalMid_Lock); | |
409 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
410 | spin_unlock(&GlobalMid_Lock); | |
411 | ||
412 | ||
789e6661 | 413 | cifs_in_send_inc(server); |
fcc31cb6 | 414 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
415 | cifs_in_send_dec(server); |
416 | cifs_save_when_sent(mid); | |
a6827c18 | 417 | mutex_unlock(&server->srv_mutex); |
789e6661 | 418 | |
ffc61ccb SP |
419 | if (rc == 0) |
420 | return 0; | |
a6827c18 | 421 | |
a6827c18 | 422 | delete_mid(mid); |
a891f0f8 | 423 | add_credits(server, 1, optype); |
a6827c18 JL |
424 | wake_up(&server->request_q); |
425 | return rc; | |
426 | } | |
427 | ||
133672ef SF |
428 | /* |
429 | * | |
430 | * Send an SMB Request. No response info (other than return code) | |
431 | * needs to be parsed. | |
432 | * | |
433 | * flags indicate the type of request buffer and how long to wait | |
434 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
435 | * | |
436 | */ | |
437 | int | |
96daf2b0 | 438 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 439 | char *in_buf, int flags) |
133672ef SF |
440 | { |
441 | int rc; | |
442 | struct kvec iov[1]; | |
443 | int resp_buf_type; | |
444 | ||
792af7b0 PS |
445 | iov[0].iov_base = in_buf; |
446 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
447 | flags |= CIFS_NO_RESP; |
448 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 449 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 450 | |
133672ef SF |
451 | return rc; |
452 | } | |
453 | ||
053d5034 | 454 | static int |
3c1105df | 455 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
456 | { |
457 | int rc = 0; | |
458 | ||
7c9421e1 PS |
459 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
460 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 461 | |
74dd92a8 | 462 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 463 | switch (mid->mid_state) { |
74dd92a8 | 464 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
465 | spin_unlock(&GlobalMid_Lock); |
466 | return rc; | |
74dd92a8 JL |
467 | case MID_RETRY_NEEDED: |
468 | rc = -EAGAIN; | |
469 | break; | |
71823baf JL |
470 | case MID_RESPONSE_MALFORMED: |
471 | rc = -EIO; | |
472 | break; | |
3c1105df JL |
473 | case MID_SHUTDOWN: |
474 | rc = -EHOSTDOWN; | |
475 | break; | |
74dd92a8 | 476 | default: |
3c1105df | 477 | list_del_init(&mid->qhead); |
7c9421e1 PS |
478 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
479 | mid->mid, mid->mid_state); | |
74dd92a8 | 480 | rc = -EIO; |
053d5034 JL |
481 | } |
482 | spin_unlock(&GlobalMid_Lock); | |
483 | ||
2b84a36c | 484 | DeleteMidQEntry(mid); |
053d5034 JL |
485 | return rc; |
486 | } | |
487 | ||
121b046a JL |
488 | static inline int |
489 | send_cancel(struct TCP_Server_Info *server, void *buf, struct mid_q_entry *mid) | |
76dcc26f | 490 | { |
121b046a JL |
491 | return server->ops->send_cancel ? |
492 | server->ops->send_cancel(server, buf, mid) : 0; | |
76dcc26f JL |
493 | } |
494 | ||
2c8f981d JL |
495 | int |
496 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
497 | bool log_error) | |
498 | { | |
792af7b0 | 499 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
500 | |
501 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
502 | |
503 | /* convert the length into a more usable form */ | |
96daf2b0 | 504 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
505 | struct kvec iov; |
506 | ||
507 | iov.iov_base = mid->resp_buf; | |
508 | iov.iov_len = len; | |
2c8f981d | 509 | /* FIXME: add code to kill session */ |
826a95e4 | 510 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
511 | mid->sequence_number + 1) != 0) |
512 | cERROR(1, "Unexpected SMB signature"); | |
513 | } | |
514 | ||
515 | /* BB special case reconnect tid and uid here? */ | |
516 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
517 | } | |
518 | ||
082d0642 | 519 | int |
792af7b0 PS |
520 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, |
521 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
522 | { | |
523 | int rc; | |
524 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
525 | struct mid_q_entry *mid; | |
526 | ||
527 | rc = allocate_mid(ses, hdr, &mid); | |
528 | if (rc) | |
529 | return rc; | |
762a4206 | 530 | rc = cifs_sign_smbv(iov, nvec, ses->server, &mid->sequence_number); |
792af7b0 PS |
531 | if (rc) |
532 | delete_mid(mid); | |
533 | *ret_mid = mid; | |
534 | return rc; | |
535 | } | |
536 | ||
7ee1af76 | 537 | int |
96daf2b0 | 538 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
a891f0f8 | 539 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, |
133672ef | 540 | const int flags) |
7ee1af76 JA |
541 | { |
542 | int rc = 0; | |
a891f0f8 | 543 | int timeout, optype; |
7ee1af76 | 544 | struct mid_q_entry *midQ; |
792af7b0 | 545 | char *buf = iov[0].iov_base; |
a891f0f8 | 546 | unsigned int credits = 1; |
50c2f753 | 547 | |
a891f0f8 PS |
548 | timeout = flags & CIFS_TIMEOUT_MASK; |
549 | optype = flags & CIFS_OP_MASK; | |
133672ef | 550 | |
a891f0f8 | 551 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
552 | |
553 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 554 | cifs_small_buf_release(buf); |
b6b38f70 | 555 | cERROR(1, "Null session"); |
7ee1af76 JA |
556 | return -EIO; |
557 | } | |
558 | ||
79a58d1f | 559 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 560 | cifs_small_buf_release(buf); |
7ee1af76 JA |
561 | return -ENOENT; |
562 | } | |
563 | ||
792af7b0 PS |
564 | /* |
565 | * Ensure that we do not send more than 50 overlapping requests | |
566 | * to the same server. We may make this configurable later or | |
567 | * use ses->maxReq. | |
568 | */ | |
7ee1af76 | 569 | |
a891f0f8 | 570 | rc = wait_for_free_request(ses->server, timeout, optype); |
7ee1af76 | 571 | if (rc) { |
792af7b0 | 572 | cifs_small_buf_release(buf); |
7ee1af76 JA |
573 | return rc; |
574 | } | |
575 | ||
792af7b0 PS |
576 | /* |
577 | * Make sure that we sign in the same order that we send on this socket | |
578 | * and avoid races inside tcp sendmsg code that could cause corruption | |
579 | * of smb data. | |
580 | */ | |
7ee1af76 | 581 | |
72ca545b | 582 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 583 | |
082d0642 | 584 | rc = ses->server->ops->setup_request(ses, iov, n_vec, &midQ); |
7ee1af76 | 585 | if (rc) { |
72ca545b | 586 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 587 | cifs_small_buf_release(buf); |
7ee1af76 | 588 | /* Update # of requests on wire to server */ |
a891f0f8 | 589 | add_credits(ses->server, 1, optype); |
7ee1af76 | 590 | return rc; |
1da177e4 | 591 | } |
1da177e4 | 592 | |
7c9421e1 | 593 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 594 | cifs_in_send_inc(ses->server); |
0496e02d | 595 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
596 | cifs_in_send_dec(ses->server); |
597 | cifs_save_when_sent(midQ); | |
7ee1af76 | 598 | |
72ca545b | 599 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 600 | |
2db7c581 | 601 | if (rc < 0) { |
792af7b0 | 602 | cifs_small_buf_release(buf); |
7ee1af76 | 603 | goto out; |
2db7c581 | 604 | } |
4b8f930f | 605 | |
a891f0f8 | 606 | if (timeout == CIFS_ASYNC_OP) { |
792af7b0 | 607 | cifs_small_buf_release(buf); |
133672ef | 608 | goto out; |
2db7c581 | 609 | } |
d6e04ae6 | 610 | |
0ade640e | 611 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 612 | if (rc != 0) { |
121b046a | 613 | send_cancel(ses->server, buf, midQ); |
1be912dd | 614 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 615 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
616 | midQ->callback = DeleteMidQEntry; |
617 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 618 | cifs_small_buf_release(buf); |
a891f0f8 | 619 | add_credits(ses->server, 1, optype); |
1be912dd JL |
620 | return rc; |
621 | } | |
622 | spin_unlock(&GlobalMid_Lock); | |
623 | } | |
d6e04ae6 | 624 | |
792af7b0 | 625 | cifs_small_buf_release(buf); |
2db7c581 | 626 | |
3c1105df | 627 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 628 | if (rc != 0) { |
a891f0f8 | 629 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
630 | return rc; |
631 | } | |
50c2f753 | 632 | |
7c9421e1 | 633 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 634 | rc = -EIO; |
2c8f981d | 635 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
636 | goto out; |
637 | } | |
638 | ||
792af7b0 PS |
639 | buf = (char *)midQ->resp_buf; |
640 | iov[0].iov_base = buf; | |
641 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 642 | if (midQ->large_buf) |
a891f0f8 | 643 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 644 | else |
a891f0f8 PS |
645 | *resp_buf_type = CIFS_SMALL_BUFFER; |
646 | ||
647 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 648 | |
082d0642 PS |
649 | rc = ses->server->ops->check_receive(midQ, ses->server, |
650 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 651 | |
2c8f981d JL |
652 | /* mark it so buf will not be freed by delete_mid */ |
653 | if ((flags & CIFS_NO_RESP) == 0) | |
654 | midQ->resp_buf = NULL; | |
7ee1af76 | 655 | out: |
ddc8cf8f | 656 | delete_mid(midQ); |
a891f0f8 | 657 | add_credits(ses->server, credits, optype); |
1da177e4 | 658 | |
d6e04ae6 SF |
659 | return rc; |
660 | } | |
1da177e4 LT |
661 | |
662 | int | |
96daf2b0 | 663 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 664 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 665 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
666 | { |
667 | int rc = 0; | |
1da177e4 LT |
668 | struct mid_q_entry *midQ; |
669 | ||
670 | if (ses == NULL) { | |
b6b38f70 | 671 | cERROR(1, "Null smb session"); |
1da177e4 LT |
672 | return -EIO; |
673 | } | |
79a58d1f | 674 | if (ses->server == NULL) { |
b6b38f70 | 675 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
676 | return -EIO; |
677 | } | |
678 | ||
79a58d1f | 679 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
680 | return -ENOENT; |
681 | ||
79a58d1f | 682 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
683 | to the same server. We may make this configurable later or |
684 | use ses->maxReq */ | |
1da177e4 | 685 | |
be8e3b00 SF |
686 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
687 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 688 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 689 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
690 | return -EIO; |
691 | } | |
692 | ||
a891f0f8 | 693 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
694 | if (rc) |
695 | return rc; | |
696 | ||
79a58d1f | 697 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
698 | and avoid races inside tcp sendmsg code that could cause corruption |
699 | of smb data */ | |
700 | ||
72ca545b | 701 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 702 | |
7ee1af76 JA |
703 | rc = allocate_mid(ses, in_buf, &midQ); |
704 | if (rc) { | |
72ca545b | 705 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 706 | /* Update # of requests on wire to server */ |
a891f0f8 | 707 | add_credits(ses->server, 1, 0); |
7ee1af76 | 708 | return rc; |
1da177e4 LT |
709 | } |
710 | ||
ad009ac9 | 711 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
712 | if (rc) { |
713 | mutex_unlock(&ses->server->srv_mutex); | |
714 | goto out; | |
715 | } | |
1da177e4 | 716 | |
7c9421e1 | 717 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
718 | |
719 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 720 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
721 | cifs_in_send_dec(ses->server); |
722 | cifs_save_when_sent(midQ); | |
72ca545b | 723 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 724 | |
79a58d1f | 725 | if (rc < 0) |
7ee1af76 JA |
726 | goto out; |
727 | ||
a891f0f8 | 728 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 729 | goto out; |
1da177e4 | 730 | |
0ade640e | 731 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 732 | if (rc != 0) { |
121b046a | 733 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 734 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 735 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
736 | /* no longer considered to be "in-flight" */ |
737 | midQ->callback = DeleteMidQEntry; | |
738 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 739 | add_credits(ses->server, 1, 0); |
1be912dd JL |
740 | return rc; |
741 | } | |
742 | spin_unlock(&GlobalMid_Lock); | |
743 | } | |
1da177e4 | 744 | |
3c1105df | 745 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 746 | if (rc != 0) { |
a891f0f8 | 747 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
748 | return rc; |
749 | } | |
50c2f753 | 750 | |
2c8f981d | 751 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 752 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 753 | rc = -EIO; |
b6b38f70 | 754 | cERROR(1, "Bad MID state?"); |
2c8f981d | 755 | goto out; |
1da177e4 | 756 | } |
7ee1af76 | 757 | |
d4e4854f | 758 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
759 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
760 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 761 | out: |
ddc8cf8f | 762 | delete_mid(midQ); |
a891f0f8 | 763 | add_credits(ses->server, 1, 0); |
1da177e4 | 764 | |
7ee1af76 JA |
765 | return rc; |
766 | } | |
1da177e4 | 767 | |
7ee1af76 JA |
768 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
769 | blocking lock to return. */ | |
770 | ||
771 | static int | |
96daf2b0 | 772 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
773 | struct smb_hdr *in_buf, |
774 | struct smb_hdr *out_buf) | |
775 | { | |
776 | int bytes_returned; | |
96daf2b0 | 777 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
778 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
779 | ||
780 | /* We just modify the current in_buf to change | |
781 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
782 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
783 | LOCKING_ANDX_CANCEL_LOCK. */ | |
784 | ||
785 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
786 | pSMB->Timeout = 0; | |
88257360 | 787 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
788 | |
789 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 790 | &bytes_returned, 0); |
7ee1af76 JA |
791 | } |
792 | ||
793 | int | |
96daf2b0 | 794 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
795 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
796 | int *pbytes_returned) | |
797 | { | |
798 | int rc = 0; | |
799 | int rstart = 0; | |
7ee1af76 | 800 | struct mid_q_entry *midQ; |
96daf2b0 | 801 | struct cifs_ses *ses; |
7ee1af76 JA |
802 | |
803 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 804 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
805 | return -EIO; |
806 | } | |
807 | ses = tcon->ses; | |
808 | ||
79a58d1f | 809 | if (ses->server == NULL) { |
b6b38f70 | 810 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
811 | return -EIO; |
812 | } | |
813 | ||
79a58d1f | 814 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
815 | return -ENOENT; |
816 | ||
79a58d1f | 817 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
818 | to the same server. We may make this configurable later or |
819 | use ses->maxReq */ | |
820 | ||
be8e3b00 SF |
821 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
822 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 823 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 824 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
825 | return -EIO; |
826 | } | |
827 | ||
a891f0f8 | 828 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
829 | if (rc) |
830 | return rc; | |
831 | ||
79a58d1f | 832 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
833 | and avoid races inside tcp sendmsg code that could cause corruption |
834 | of smb data */ | |
835 | ||
72ca545b | 836 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
837 | |
838 | rc = allocate_mid(ses, in_buf, &midQ); | |
839 | if (rc) { | |
72ca545b | 840 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
841 | return rc; |
842 | } | |
843 | ||
7ee1af76 | 844 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 845 | if (rc) { |
ddc8cf8f | 846 | delete_mid(midQ); |
829049cb VL |
847 | mutex_unlock(&ses->server->srv_mutex); |
848 | return rc; | |
849 | } | |
1da177e4 | 850 | |
7c9421e1 | 851 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 852 | cifs_in_send_inc(ses->server); |
be8e3b00 | 853 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
854 | cifs_in_send_dec(ses->server); |
855 | cifs_save_when_sent(midQ); | |
72ca545b | 856 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 857 | |
79a58d1f | 858 | if (rc < 0) { |
ddc8cf8f | 859 | delete_mid(midQ); |
7ee1af76 JA |
860 | return rc; |
861 | } | |
862 | ||
863 | /* Wait for a reply - allow signals to interrupt. */ | |
864 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 865 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
866 | ((ses->server->tcpStatus != CifsGood) && |
867 | (ses->server->tcpStatus != CifsNew))); | |
868 | ||
869 | /* Were we interrupted by a signal ? */ | |
870 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 871 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
872 | ((ses->server->tcpStatus == CifsGood) || |
873 | (ses->server->tcpStatus == CifsNew))) { | |
874 | ||
875 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
876 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
877 | blocking lock to return. */ | |
121b046a | 878 | rc = send_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 879 | if (rc) { |
ddc8cf8f | 880 | delete_mid(midQ); |
7ee1af76 JA |
881 | return rc; |
882 | } | |
883 | } else { | |
884 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
885 | to cause the blocking lock to return. */ | |
886 | ||
887 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
888 | ||
889 | /* If we get -ENOLCK back the lock may have | |
890 | already been removed. Don't exit in this case. */ | |
891 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 892 | delete_mid(midQ); |
7ee1af76 JA |
893 | return rc; |
894 | } | |
895 | } | |
896 | ||
1be912dd JL |
897 | rc = wait_for_response(ses->server, midQ); |
898 | if (rc) { | |
121b046a | 899 | send_cancel(ses->server, in_buf, midQ); |
1be912dd | 900 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 901 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
902 | /* no longer considered to be "in-flight" */ |
903 | midQ->callback = DeleteMidQEntry; | |
904 | spin_unlock(&GlobalMid_Lock); | |
905 | return rc; | |
906 | } | |
907 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 908 | } |
1be912dd JL |
909 | |
910 | /* We got the response - restart system call. */ | |
911 | rstart = 1; | |
7ee1af76 JA |
912 | } |
913 | ||
3c1105df | 914 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 915 | if (rc != 0) |
7ee1af76 | 916 | return rc; |
50c2f753 | 917 | |
17c8bfed | 918 | /* rcvd frame is ok */ |
7c9421e1 | 919 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 920 | rc = -EIO; |
b6b38f70 | 921 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
922 | goto out; |
923 | } | |
1da177e4 | 924 | |
d4e4854f | 925 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
926 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
927 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 928 | out: |
ddc8cf8f | 929 | delete_mid(midQ); |
7ee1af76 JA |
930 | if (rstart && rc == -EACCES) |
931 | return -ERESTARTSYS; | |
1da177e4 LT |
932 | return rc; |
933 | } |