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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 | ||
738f9de5 PS |
248 | if (n_vec < 2) |
249 | return -EIO; | |
250 | ||
f96637be | 251 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
6f49f46b | 252 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
738f9de5 | 253 | dump_smb(iov[1].iov_base, iov[1].iov_len); |
6f49f46b | 254 | |
b8eed283 JL |
255 | /* cork the socket */ |
256 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
257 | (char *)&val, sizeof(val)); | |
258 | ||
3ab3f2a1 AV |
259 | size = 0; |
260 | for (i = 0; i < n_vec; i++) | |
261 | size += iov[i].iov_len; | |
262 | ||
263 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size); | |
264 | ||
265 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
97bc00b3 JL |
266 | if (rc < 0) |
267 | goto uncork; | |
268 | ||
269 | total_len += sent; | |
270 | ||
271 | /* now walk the page array and send each page in it */ | |
272 | for (i = 0; i < rqst->rq_npages; i++) { | |
3ab3f2a1 AV |
273 | size_t len = i == rqst->rq_npages - 1 |
274 | ? rqst->rq_tailsz | |
275 | : rqst->rq_pagesz; | |
276 | struct bio_vec bvec = { | |
277 | .bv_page = rqst->rq_pages[i], | |
278 | .bv_len = len | |
279 | }; | |
280 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, | |
281 | &bvec, 1, len); | |
282 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
97bc00b3 JL |
283 | if (rc < 0) |
284 | break; | |
285 | ||
286 | total_len += sent; | |
287 | } | |
1da177e4 | 288 | |
97bc00b3 | 289 | uncork: |
b8eed283 JL |
290 | /* uncork it */ |
291 | val = 0; | |
292 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
293 | (char *)&val, sizeof(val)); | |
294 | ||
edf1ae40 | 295 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
f96637be JP |
296 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
297 | smb_buf_length + 4, total_len); | |
6f49f46b JL |
298 | /* |
299 | * If we have only sent part of an SMB then the next SMB could | |
300 | * be taken as the remainder of this one. We need to kill the | |
301 | * socket so the server throws away the partial SMB | |
302 | */ | |
edf1ae40 SF |
303 | server->tcpStatus = CifsNeedReconnect; |
304 | } | |
305 | ||
d804d41d | 306 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
307 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
308 | rc); | |
d804d41d | 309 | else |
1da177e4 | 310 | rc = 0; |
1da177e4 LT |
311 | |
312 | return rc; | |
313 | } | |
314 | ||
6f49f46b JL |
315 | static int |
316 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) | |
317 | { | |
318 | struct smb_rqst rqst = { .rq_iov = iov, | |
319 | .rq_nvec = n_vec }; | |
320 | ||
321 | return smb_send_rqst(server, &rqst); | |
322 | } | |
323 | ||
0496e02d JL |
324 | int |
325 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
326 | unsigned int smb_buf_length) | |
327 | { | |
738f9de5 | 328 | struct kvec iov[2]; |
0496e02d | 329 | |
738f9de5 PS |
330 | iov[0].iov_base = smb_buffer; |
331 | iov[0].iov_len = 4; | |
332 | iov[1].iov_base = (char *)smb_buffer + 4; | |
333 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 334 | |
738f9de5 | 335 | return smb_sendv(server, iov, 2); |
0496e02d JL |
336 | } |
337 | ||
fc40f9cf | 338 | static int |
a891f0f8 | 339 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 340 | int *credits) |
1da177e4 | 341 | { |
5bc59498 PS |
342 | int rc; |
343 | ||
fc40f9cf | 344 | spin_lock(&server->req_lock); |
a891f0f8 | 345 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 346 | /* oplock breaks must not be held up */ |
fc40f9cf | 347 | server->in_flight++; |
bc205ed1 | 348 | *credits -= 1; |
fc40f9cf | 349 | spin_unlock(&server->req_lock); |
27a97a61 VL |
350 | return 0; |
351 | } | |
352 | ||
27a97a61 | 353 | while (1) { |
bc205ed1 | 354 | if (*credits <= 0) { |
fc40f9cf | 355 | spin_unlock(&server->req_lock); |
789e6661 | 356 | cifs_num_waiters_inc(server); |
5bc59498 | 357 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 358 | has_credits(server, credits)); |
789e6661 | 359 | cifs_num_waiters_dec(server); |
5bc59498 PS |
360 | if (rc) |
361 | return rc; | |
fc40f9cf | 362 | spin_lock(&server->req_lock); |
27a97a61 | 363 | } else { |
c5797a94 | 364 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 365 | spin_unlock(&server->req_lock); |
27a97a61 | 366 | return -ENOENT; |
1da177e4 | 367 | } |
27a97a61 | 368 | |
2d86dbc9 PS |
369 | /* |
370 | * Can not count locking commands against total | |
371 | * as they are allowed to block on server. | |
372 | */ | |
27a97a61 VL |
373 | |
374 | /* update # of requests on the wire to server */ | |
a891f0f8 | 375 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 376 | *credits -= 1; |
fc40f9cf | 377 | server->in_flight++; |
2d86dbc9 | 378 | } |
fc40f9cf | 379 | spin_unlock(&server->req_lock); |
27a97a61 | 380 | break; |
1da177e4 LT |
381 | } |
382 | } | |
7ee1af76 JA |
383 | return 0; |
384 | } | |
1da177e4 | 385 | |
bc205ed1 | 386 | static int |
a891f0f8 PS |
387 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
388 | const int optype) | |
bc205ed1 | 389 | { |
eb4c7df6 SP |
390 | int *val; |
391 | ||
392 | val = server->ops->get_credits_field(server, optype); | |
393 | /* Since an echo is already inflight, no need to wait to send another */ | |
394 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
395 | return -EAGAIN; | |
396 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
397 | } |
398 | ||
cb7e9eab PS |
399 | int |
400 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
401 | unsigned int *num, unsigned int *credits) | |
402 | { | |
403 | *num = size; | |
404 | *credits = 0; | |
405 | return 0; | |
406 | } | |
407 | ||
96daf2b0 | 408 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
409 | struct mid_q_entry **ppmidQ) |
410 | { | |
1da177e4 | 411 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 412 | return -ENOENT; |
8fbbd365 VL |
413 | } |
414 | ||
415 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 416 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 417 | return -EAGAIN; |
8fbbd365 VL |
418 | } |
419 | ||
7f48558e | 420 | if (ses->status == CifsNew) { |
79a58d1f | 421 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 422 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 423 | return -EAGAIN; |
ad7a2926 | 424 | /* else ok - we are setting up session */ |
1da177e4 | 425 | } |
7f48558e SP |
426 | |
427 | if (ses->status == CifsExiting) { | |
428 | /* check if SMB session is bad because we are setting it up */ | |
429 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
430 | return -EAGAIN; | |
431 | /* else ok - we are shutting down session */ | |
432 | } | |
433 | ||
24b9b06b | 434 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 435 | if (*ppmidQ == NULL) |
7ee1af76 | 436 | return -ENOMEM; |
ddc8cf8f JL |
437 | spin_lock(&GlobalMid_Lock); |
438 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
439 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
440 | return 0; |
441 | } | |
442 | ||
0ade640e JL |
443 | static int |
444 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 445 | { |
0ade640e | 446 | int error; |
7ee1af76 | 447 | |
5853cc2a | 448 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 449 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
450 | if (error < 0) |
451 | return -ERESTARTSYS; | |
7ee1af76 | 452 | |
0ade640e | 453 | return 0; |
7ee1af76 JA |
454 | } |
455 | ||
fec344e3 JL |
456 | struct mid_q_entry * |
457 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
458 | { |
459 | int rc; | |
fec344e3 | 460 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
461 | struct mid_q_entry *mid; |
462 | ||
738f9de5 PS |
463 | if (rqst->rq_iov[0].iov_len != 4 || |
464 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
465 | return ERR_PTR(-EIO); | |
466 | ||
792af7b0 | 467 | /* enable signing if server requires it */ |
38d77c50 | 468 | if (server->sign) |
792af7b0 PS |
469 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
470 | ||
471 | mid = AllocMidQEntry(hdr, server); | |
472 | if (mid == NULL) | |
fec344e3 | 473 | return ERR_PTR(-ENOMEM); |
792af7b0 | 474 | |
fec344e3 | 475 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
476 | if (rc) { |
477 | DeleteMidQEntry(mid); | |
fec344e3 | 478 | return ERR_PTR(rc); |
ffc61ccb SP |
479 | } |
480 | ||
fec344e3 | 481 | return mid; |
792af7b0 | 482 | } |
133672ef | 483 | |
a6827c18 JL |
484 | /* |
485 | * Send a SMB request and set the callback function in the mid to handle | |
486 | * the result. Caller is responsible for dealing with timeouts. | |
487 | */ | |
488 | int | |
fec344e3 | 489 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
738f9de5 PS |
490 | mid_receive_t *receive, mid_callback_t *callback, void *cbdata, |
491 | const int flags) | |
a6827c18 | 492 | { |
a891f0f8 | 493 | int rc, timeout, optype; |
a6827c18 | 494 | struct mid_q_entry *mid; |
cb7e9eab | 495 | unsigned int credits = 0; |
a6827c18 | 496 | |
a891f0f8 PS |
497 | timeout = flags & CIFS_TIMEOUT_MASK; |
498 | optype = flags & CIFS_OP_MASK; | |
499 | ||
cb7e9eab PS |
500 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
501 | rc = wait_for_free_request(server, timeout, optype); | |
502 | if (rc) | |
503 | return rc; | |
504 | credits = 1; | |
505 | } | |
a6827c18 JL |
506 | |
507 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
508 | mid = server->ops->setup_async_request(server, rqst); |
509 | if (IS_ERR(mid)) { | |
a6827c18 | 510 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 511 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 512 | return PTR_ERR(mid); |
a6827c18 JL |
513 | } |
514 | ||
44d22d84 | 515 | mid->receive = receive; |
a6827c18 JL |
516 | mid->callback = callback; |
517 | mid->callback_data = cbdata; | |
7c9421e1 | 518 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 519 | |
ffc61ccb SP |
520 | /* put it on the pending_mid_q */ |
521 | spin_lock(&GlobalMid_Lock); | |
522 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
523 | spin_unlock(&GlobalMid_Lock); | |
524 | ||
525 | ||
789e6661 | 526 | cifs_in_send_inc(server); |
fec344e3 | 527 | rc = smb_send_rqst(server, rqst); |
789e6661 SF |
528 | cifs_in_send_dec(server); |
529 | cifs_save_when_sent(mid); | |
ad313cb8 | 530 | |
820962dc | 531 | if (rc < 0) { |
ad313cb8 | 532 | server->sequence_number -= 2; |
820962dc RV |
533 | cifs_delete_mid(mid); |
534 | } | |
535 | ||
a6827c18 | 536 | mutex_unlock(&server->srv_mutex); |
789e6661 | 537 | |
ffc61ccb SP |
538 | if (rc == 0) |
539 | return 0; | |
a6827c18 | 540 | |
cb7e9eab | 541 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
542 | return rc; |
543 | } | |
544 | ||
133672ef SF |
545 | /* |
546 | * | |
547 | * Send an SMB Request. No response info (other than return code) | |
548 | * needs to be parsed. | |
549 | * | |
550 | * flags indicate the type of request buffer and how long to wait | |
551 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
552 | * | |
553 | */ | |
554 | int | |
96daf2b0 | 555 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 556 | char *in_buf, int flags) |
133672ef SF |
557 | { |
558 | int rc; | |
559 | struct kvec iov[1]; | |
da502f7d | 560 | struct kvec rsp_iov; |
133672ef SF |
561 | int resp_buf_type; |
562 | ||
792af7b0 PS |
563 | iov[0].iov_base = in_buf; |
564 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 565 | flags |= CIFS_NO_RESP; |
da502f7d | 566 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 567 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 568 | |
133672ef SF |
569 | return rc; |
570 | } | |
571 | ||
053d5034 | 572 | static int |
3c1105df | 573 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
574 | { |
575 | int rc = 0; | |
576 | ||
f96637be JP |
577 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
578 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 579 | |
74dd92a8 | 580 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 581 | switch (mid->mid_state) { |
74dd92a8 | 582 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
583 | spin_unlock(&GlobalMid_Lock); |
584 | return rc; | |
74dd92a8 JL |
585 | case MID_RETRY_NEEDED: |
586 | rc = -EAGAIN; | |
587 | break; | |
71823baf JL |
588 | case MID_RESPONSE_MALFORMED: |
589 | rc = -EIO; | |
590 | break; | |
3c1105df JL |
591 | case MID_SHUTDOWN: |
592 | rc = -EHOSTDOWN; | |
593 | break; | |
74dd92a8 | 594 | default: |
3c1105df | 595 | list_del_init(&mid->qhead); |
f96637be JP |
596 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
597 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 598 | rc = -EIO; |
053d5034 JL |
599 | } |
600 | spin_unlock(&GlobalMid_Lock); | |
601 | ||
5fb4e288 | 602 | mutex_lock(&server->srv_mutex); |
2b84a36c | 603 | DeleteMidQEntry(mid); |
5fb4e288 | 604 | mutex_unlock(&server->srv_mutex); |
053d5034 JL |
605 | return rc; |
606 | } | |
607 | ||
121b046a | 608 | static inline int |
fb2036d8 PS |
609 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
610 | struct mid_q_entry *mid) | |
76dcc26f | 611 | { |
121b046a | 612 | return server->ops->send_cancel ? |
fb2036d8 | 613 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
614 | } |
615 | ||
2c8f981d JL |
616 | int |
617 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
618 | bool log_error) | |
619 | { | |
792af7b0 | 620 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
621 | |
622 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
623 | |
624 | /* convert the length into a more usable form */ | |
38d77c50 | 625 | if (server->sign) { |
738f9de5 | 626 | struct kvec iov[2]; |
985e4ff0 | 627 | int rc = 0; |
738f9de5 PS |
628 | struct smb_rqst rqst = { .rq_iov = iov, |
629 | .rq_nvec = 2 }; | |
826a95e4 | 630 | |
738f9de5 PS |
631 | iov[0].iov_base = mid->resp_buf; |
632 | iov[0].iov_len = 4; | |
633 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
634 | iov[1].iov_len = len - 4; | |
2c8f981d | 635 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 636 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 637 | mid->sequence_number); |
985e4ff0 | 638 | if (rc) |
f96637be JP |
639 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
640 | rc); | |
2c8f981d JL |
641 | } |
642 | ||
643 | /* BB special case reconnect tid and uid here? */ | |
644 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
645 | } | |
646 | ||
fec344e3 JL |
647 | struct mid_q_entry * |
648 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
649 | { |
650 | int rc; | |
fec344e3 | 651 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
652 | struct mid_q_entry *mid; |
653 | ||
738f9de5 PS |
654 | if (rqst->rq_iov[0].iov_len != 4 || |
655 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
656 | return ERR_PTR(-EIO); | |
657 | ||
792af7b0 PS |
658 | rc = allocate_mid(ses, hdr, &mid); |
659 | if (rc) | |
fec344e3 JL |
660 | return ERR_PTR(rc); |
661 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
662 | if (rc) { | |
3c1bf7e4 | 663 | cifs_delete_mid(mid); |
fec344e3 JL |
664 | return ERR_PTR(rc); |
665 | } | |
666 | return mid; | |
792af7b0 PS |
667 | } |
668 | ||
b8f57ee8 | 669 | int |
738f9de5 PS |
670 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
671 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
672 | struct kvec *resp_iov) | |
7ee1af76 JA |
673 | { |
674 | int rc = 0; | |
a891f0f8 | 675 | int timeout, optype; |
7ee1af76 | 676 | struct mid_q_entry *midQ; |
a891f0f8 | 677 | unsigned int credits = 1; |
738f9de5 | 678 | char *buf; |
50c2f753 | 679 | |
a891f0f8 PS |
680 | timeout = flags & CIFS_TIMEOUT_MASK; |
681 | optype = flags & CIFS_OP_MASK; | |
133672ef | 682 | |
a891f0f8 | 683 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
684 | |
685 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 686 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
687 | return -EIO; |
688 | } | |
689 | ||
da502f7d | 690 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 691 | return -ENOENT; |
7ee1af76 | 692 | |
792af7b0 PS |
693 | /* |
694 | * Ensure that we do not send more than 50 overlapping requests | |
695 | * to the same server. We may make this configurable later or | |
696 | * use ses->maxReq. | |
697 | */ | |
7ee1af76 | 698 | |
a891f0f8 | 699 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 700 | if (rc) |
7ee1af76 | 701 | return rc; |
7ee1af76 | 702 | |
792af7b0 PS |
703 | /* |
704 | * Make sure that we sign in the same order that we send on this socket | |
705 | * and avoid races inside tcp sendmsg code that could cause corruption | |
706 | * of smb data. | |
707 | */ | |
7ee1af76 | 708 | |
72ca545b | 709 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 710 | |
738f9de5 | 711 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 712 | if (IS_ERR(midQ)) { |
72ca545b | 713 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 714 | /* Update # of requests on wire to server */ |
a891f0f8 | 715 | add_credits(ses->server, 1, optype); |
fec344e3 | 716 | return PTR_ERR(midQ); |
1da177e4 | 717 | } |
1da177e4 | 718 | |
7c9421e1 | 719 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 720 | cifs_in_send_inc(ses->server); |
738f9de5 | 721 | rc = smb_send_rqst(ses->server, rqst); |
789e6661 SF |
722 | cifs_in_send_dec(ses->server); |
723 | cifs_save_when_sent(midQ); | |
7ee1af76 | 724 | |
ad313cb8 JL |
725 | if (rc < 0) |
726 | ses->server->sequence_number -= 2; | |
72ca545b | 727 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 728 | |
da502f7d | 729 | if (rc < 0) |
7ee1af76 | 730 | goto out; |
4b8f930f | 731 | |
da502f7d | 732 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 733 | goto out; |
d6e04ae6 | 734 | |
0ade640e | 735 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 736 | if (rc != 0) { |
738f9de5 | 737 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 738 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 739 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
740 | midQ->callback = DeleteMidQEntry; |
741 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 742 | add_credits(ses->server, 1, optype); |
1be912dd JL |
743 | return rc; |
744 | } | |
745 | spin_unlock(&GlobalMid_Lock); | |
746 | } | |
d6e04ae6 | 747 | |
3c1105df | 748 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 749 | if (rc != 0) { |
a891f0f8 | 750 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
751 | return rc; |
752 | } | |
50c2f753 | 753 | |
7c9421e1 | 754 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 755 | rc = -EIO; |
f96637be | 756 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
757 | goto out; |
758 | } | |
759 | ||
792af7b0 | 760 | buf = (char *)midQ->resp_buf; |
da502f7d PS |
761 | resp_iov->iov_base = buf; |
762 | resp_iov->iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 763 | if (midQ->large_buf) |
a891f0f8 | 764 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 765 | else |
a891f0f8 PS |
766 | *resp_buf_type = CIFS_SMALL_BUFFER; |
767 | ||
768 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 769 | |
082d0642 PS |
770 | rc = ses->server->ops->check_receive(midQ, ses->server, |
771 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 772 | |
3c1bf7e4 | 773 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
774 | if ((flags & CIFS_NO_RESP) == 0) |
775 | midQ->resp_buf = NULL; | |
7ee1af76 | 776 | out: |
3c1bf7e4 | 777 | cifs_delete_mid(midQ); |
a891f0f8 | 778 | add_credits(ses->server, credits, optype); |
1da177e4 | 779 | |
d6e04ae6 SF |
780 | return rc; |
781 | } | |
1da177e4 | 782 | |
738f9de5 PS |
783 | int |
784 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
785 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
786 | const int flags, struct kvec *resp_iov) | |
787 | { | |
788 | struct smb_rqst rqst; | |
789 | struct kvec *new_iov; | |
790 | int rc; | |
791 | ||
792 | new_iov = kmalloc(sizeof(struct kvec) * (n_vec + 1), GFP_KERNEL); | |
793 | if (!new_iov) | |
794 | return -ENOMEM; | |
795 | ||
796 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
797 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
798 | ||
799 | new_iov[0].iov_base = new_iov[1].iov_base; | |
800 | new_iov[0].iov_len = 4; | |
801 | new_iov[1].iov_base += 4; | |
802 | new_iov[1].iov_len -= 4; | |
803 | ||
804 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
805 | rqst.rq_iov = new_iov; | |
806 | rqst.rq_nvec = n_vec + 1; | |
807 | ||
808 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
809 | kfree(new_iov); | |
810 | return rc; | |
811 | } | |
812 | ||
1da177e4 | 813 | int |
96daf2b0 | 814 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 815 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 816 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
817 | { |
818 | int rc = 0; | |
1da177e4 | 819 | struct mid_q_entry *midQ; |
fb2036d8 PS |
820 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
821 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
822 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
823 | |
824 | if (ses == NULL) { | |
f96637be | 825 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
826 | return -EIO; |
827 | } | |
79a58d1f | 828 | if (ses->server == NULL) { |
f96637be | 829 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
830 | return -EIO; |
831 | } | |
832 | ||
79a58d1f | 833 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
834 | return -ENOENT; |
835 | ||
79a58d1f | 836 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
837 | to the same server. We may make this configurable later or |
838 | use ses->maxReq */ | |
1da177e4 | 839 | |
fb2036d8 | 840 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 841 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 842 | len); |
6d9c6d54 VL |
843 | return -EIO; |
844 | } | |
845 | ||
a891f0f8 | 846 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
847 | if (rc) |
848 | return rc; | |
849 | ||
79a58d1f | 850 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
851 | and avoid races inside tcp sendmsg code that could cause corruption |
852 | of smb data */ | |
853 | ||
72ca545b | 854 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 855 | |
7ee1af76 JA |
856 | rc = allocate_mid(ses, in_buf, &midQ); |
857 | if (rc) { | |
72ca545b | 858 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 859 | /* Update # of requests on wire to server */ |
a891f0f8 | 860 | add_credits(ses->server, 1, 0); |
7ee1af76 | 861 | return rc; |
1da177e4 LT |
862 | } |
863 | ||
ad009ac9 | 864 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
865 | if (rc) { |
866 | mutex_unlock(&ses->server->srv_mutex); | |
867 | goto out; | |
868 | } | |
1da177e4 | 869 | |
7c9421e1 | 870 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
871 | |
872 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 873 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
874 | cifs_in_send_dec(ses->server); |
875 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
876 | |
877 | if (rc < 0) | |
878 | ses->server->sequence_number -= 2; | |
879 | ||
72ca545b | 880 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 881 | |
79a58d1f | 882 | if (rc < 0) |
7ee1af76 JA |
883 | goto out; |
884 | ||
a891f0f8 | 885 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 886 | goto out; |
1da177e4 | 887 | |
0ade640e | 888 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 889 | if (rc != 0) { |
fb2036d8 | 890 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 891 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 892 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
893 | /* no longer considered to be "in-flight" */ |
894 | midQ->callback = DeleteMidQEntry; | |
895 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 896 | add_credits(ses->server, 1, 0); |
1be912dd JL |
897 | return rc; |
898 | } | |
899 | spin_unlock(&GlobalMid_Lock); | |
900 | } | |
1da177e4 | 901 | |
3c1105df | 902 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 903 | if (rc != 0) { |
a891f0f8 | 904 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
905 | return rc; |
906 | } | |
50c2f753 | 907 | |
2c8f981d | 908 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 909 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 910 | rc = -EIO; |
f96637be | 911 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 912 | goto out; |
1da177e4 | 913 | } |
7ee1af76 | 914 | |
d4e4854f | 915 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
916 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
917 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 918 | out: |
3c1bf7e4 | 919 | cifs_delete_mid(midQ); |
a891f0f8 | 920 | add_credits(ses->server, 1, 0); |
1da177e4 | 921 | |
7ee1af76 JA |
922 | return rc; |
923 | } | |
1da177e4 | 924 | |
7ee1af76 JA |
925 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
926 | blocking lock to return. */ | |
927 | ||
928 | static int | |
96daf2b0 | 929 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
930 | struct smb_hdr *in_buf, |
931 | struct smb_hdr *out_buf) | |
932 | { | |
933 | int bytes_returned; | |
96daf2b0 | 934 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
935 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
936 | ||
937 | /* We just modify the current in_buf to change | |
938 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
939 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
940 | LOCKING_ANDX_CANCEL_LOCK. */ | |
941 | ||
942 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
943 | pSMB->Timeout = 0; | |
88257360 | 944 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
945 | |
946 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 947 | &bytes_returned, 0); |
7ee1af76 JA |
948 | } |
949 | ||
950 | int | |
96daf2b0 | 951 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
952 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
953 | int *pbytes_returned) | |
954 | { | |
955 | int rc = 0; | |
956 | int rstart = 0; | |
7ee1af76 | 957 | struct mid_q_entry *midQ; |
96daf2b0 | 958 | struct cifs_ses *ses; |
fb2036d8 PS |
959 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
960 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
961 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
962 | |
963 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 964 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
965 | return -EIO; |
966 | } | |
967 | ses = tcon->ses; | |
968 | ||
79a58d1f | 969 | if (ses->server == NULL) { |
f96637be | 970 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
971 | return -EIO; |
972 | } | |
973 | ||
79a58d1f | 974 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
975 | return -ENOENT; |
976 | ||
79a58d1f | 977 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
978 | to the same server. We may make this configurable later or |
979 | use ses->maxReq */ | |
980 | ||
fb2036d8 | 981 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 982 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 983 | len); |
6d9c6d54 VL |
984 | return -EIO; |
985 | } | |
986 | ||
a891f0f8 | 987 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
988 | if (rc) |
989 | return rc; | |
990 | ||
79a58d1f | 991 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
992 | and avoid races inside tcp sendmsg code that could cause corruption |
993 | of smb data */ | |
994 | ||
72ca545b | 995 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
996 | |
997 | rc = allocate_mid(ses, in_buf, &midQ); | |
998 | if (rc) { | |
72ca545b | 999 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1000 | return rc; |
1001 | } | |
1002 | ||
7ee1af76 | 1003 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1004 | if (rc) { |
3c1bf7e4 | 1005 | cifs_delete_mid(midQ); |
829049cb VL |
1006 | mutex_unlock(&ses->server->srv_mutex); |
1007 | return rc; | |
1008 | } | |
1da177e4 | 1009 | |
7c9421e1 | 1010 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1011 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1012 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1013 | cifs_in_send_dec(ses->server); |
1014 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1015 | |
1016 | if (rc < 0) | |
1017 | ses->server->sequence_number -= 2; | |
1018 | ||
72ca545b | 1019 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1020 | |
79a58d1f | 1021 | if (rc < 0) { |
3c1bf7e4 | 1022 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1023 | return rc; |
1024 | } | |
1025 | ||
1026 | /* Wait for a reply - allow signals to interrupt. */ | |
1027 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1028 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1029 | ((ses->server->tcpStatus != CifsGood) && |
1030 | (ses->server->tcpStatus != CifsNew))); | |
1031 | ||
1032 | /* Were we interrupted by a signal ? */ | |
1033 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1034 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1035 | ((ses->server->tcpStatus == CifsGood) || |
1036 | (ses->server->tcpStatus == CifsNew))) { | |
1037 | ||
1038 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1039 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1040 | blocking lock to return. */ | |
fb2036d8 | 1041 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1042 | if (rc) { |
3c1bf7e4 | 1043 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1044 | return rc; |
1045 | } | |
1046 | } else { | |
1047 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1048 | to cause the blocking lock to return. */ | |
1049 | ||
1050 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1051 | ||
1052 | /* If we get -ENOLCK back the lock may have | |
1053 | already been removed. Don't exit in this case. */ | |
1054 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1055 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1056 | return rc; |
1057 | } | |
1058 | } | |
1059 | ||
1be912dd JL |
1060 | rc = wait_for_response(ses->server, midQ); |
1061 | if (rc) { | |
fb2036d8 | 1062 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1063 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1064 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1065 | /* no longer considered to be "in-flight" */ |
1066 | midQ->callback = DeleteMidQEntry; | |
1067 | spin_unlock(&GlobalMid_Lock); | |
1068 | return rc; | |
1069 | } | |
1070 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1071 | } |
1be912dd JL |
1072 | |
1073 | /* We got the response - restart system call. */ | |
1074 | rstart = 1; | |
7ee1af76 JA |
1075 | } |
1076 | ||
3c1105df | 1077 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1078 | if (rc != 0) |
7ee1af76 | 1079 | return rc; |
50c2f753 | 1080 | |
17c8bfed | 1081 | /* rcvd frame is ok */ |
7c9421e1 | 1082 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1083 | rc = -EIO; |
f96637be | 1084 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1085 | goto out; |
1086 | } | |
1da177e4 | 1087 | |
d4e4854f | 1088 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1089 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1090 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1091 | out: |
3c1bf7e4 | 1092 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1093 | if (rstart && rc == -EACCES) |
1094 | return -ERESTARTSYS; | |
1da177e4 LT |
1095 | return rc; |
1096 | } |