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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); |
a6f74e80 N |
58 | memset(temp, 0, sizeof(struct mid_q_entry)); |
59 | temp->mid = get_mid(smb_buffer); | |
60 | temp->pid = current->pid; | |
61 | temp->command = cpu_to_le16(smb_buffer->Command); | |
62 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 63 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
64 | /* when mid allocated can be before when sent */ |
65 | temp->when_alloc = jiffies; | |
66 | temp->server = server; | |
2b84a36c | 67 | |
a6f74e80 N |
68 | /* |
69 | * The default is for the mid to be synchronous, so the | |
70 | * default callback just wakes up the current task. | |
71 | */ | |
72 | temp->callback = cifs_wake_up_task; | |
73 | temp->callback_data = current; | |
1da177e4 | 74 | |
1da177e4 | 75 | atomic_inc(&midCount); |
7c9421e1 | 76 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
77 | return temp; |
78 | } | |
79 | ||
766fdbb5 | 80 | void |
1da177e4 LT |
81 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
82 | { | |
1047abc1 | 83 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 84 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
85 | unsigned long now; |
86 | #endif | |
7c9421e1 | 87 | midEntry->mid_state = MID_FREE; |
8097531a | 88 | atomic_dec(&midCount); |
7c9421e1 | 89 | if (midEntry->large_buf) |
b8643e1b SF |
90 | cifs_buf_release(midEntry->resp_buf); |
91 | else | |
92 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
93 | #ifdef CONFIG_CIFS_STATS2 |
94 | now = jiffies; | |
95 | /* commands taking longer than one second are indications that | |
96 | something is wrong, unless it is quite a slow link or server */ | |
4328fea7 | 97 | if (time_after(now, midEntry->when_alloc + HZ)) { |
2dc7e1c0 | 98 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
0b456f04 | 99 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 100 | midEntry->command, midEntry->mid); |
0b456f04 | 101 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
102 | now - midEntry->when_alloc, |
103 | now - midEntry->when_sent, | |
104 | now - midEntry->when_received); | |
105 | } | |
106 | } | |
107 | #endif | |
1da177e4 LT |
108 | mempool_free(midEntry, cifs_mid_poolp); |
109 | } | |
110 | ||
3c1bf7e4 PS |
111 | void |
112 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
113 | { |
114 | spin_lock(&GlobalMid_Lock); | |
115 | list_del(&mid->qhead); | |
116 | spin_unlock(&GlobalMid_Lock); | |
117 | ||
118 | DeleteMidQEntry(mid); | |
119 | } | |
120 | ||
6f49f46b JL |
121 | /* |
122 | * smb_send_kvec - send an array of kvecs to the server | |
123 | * @server: Server to send the data to | |
3ab3f2a1 | 124 | * @smb_msg: Message to send |
6f49f46b JL |
125 | * @sent: amount of data sent on socket is stored here |
126 | * | |
127 | * Our basic "send data to server" function. Should be called with srv_mutex | |
128 | * held. The caller is responsible for handling the results. | |
129 | */ | |
d6e04ae6 | 130 | static int |
3ab3f2a1 AV |
131 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
132 | size_t *sent) | |
1da177e4 LT |
133 | { |
134 | int rc = 0; | |
3ab3f2a1 | 135 | int retries = 0; |
edf1ae40 | 136 | struct socket *ssocket = server->ssocket; |
50c2f753 | 137 | |
6f49f46b JL |
138 | *sent = 0; |
139 | ||
3ab3f2a1 AV |
140 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
141 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
142 | smb_msg->msg_control = NULL; | |
143 | smb_msg->msg_controllen = 0; | |
0496e02d | 144 | if (server->noblocksnd) |
3ab3f2a1 | 145 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 146 | else |
3ab3f2a1 | 147 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 148 | |
3ab3f2a1 | 149 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
150 | /* |
151 | * If blocking send, we try 3 times, since each can block | |
152 | * for 5 seconds. For nonblocking we have to try more | |
153 | * but wait increasing amounts of time allowing time for | |
154 | * socket to clear. The overall time we wait in either | |
155 | * case to send on the socket is about 15 seconds. | |
156 | * Similarly we wait for 15 seconds for a response from | |
157 | * the server in SendReceive[2] for the server to send | |
158 | * a response back for most types of requests (except | |
159 | * SMB Write past end of file which can be slow, and | |
160 | * blocking lock operations). NFS waits slightly longer | |
161 | * than CIFS, but this can make it take longer for | |
162 | * nonresponsive servers to be detected and 15 seconds | |
163 | * is more than enough time for modern networks to | |
164 | * send a packet. In most cases if we fail to send | |
165 | * after the retries we will kill the socket and | |
166 | * reconnect which may clear the network problem. | |
167 | */ | |
3ab3f2a1 | 168 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 169 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
170 | retries++; |
171 | if (retries >= 14 || | |
172 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
173 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
174 | ssocket); | |
3ab3f2a1 | 175 | return -EAGAIN; |
1da177e4 | 176 | } |
3ab3f2a1 | 177 | msleep(1 << retries); |
1da177e4 LT |
178 | continue; |
179 | } | |
6f49f46b | 180 | |
79a58d1f | 181 | if (rc < 0) |
3ab3f2a1 | 182 | return rc; |
6f49f46b | 183 | |
79a58d1f | 184 | if (rc == 0) { |
3e84469d SF |
185 | /* should never happen, letting socket clear before |
186 | retrying is our only obvious option here */ | |
f96637be | 187 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
188 | msleep(500); |
189 | continue; | |
d6e04ae6 | 190 | } |
6f49f46b | 191 | |
3ab3f2a1 AV |
192 | /* send was at least partially successful */ |
193 | *sent += rc; | |
194 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 195 | } |
3ab3f2a1 | 196 | return 0; |
97bc00b3 JL |
197 | } |
198 | ||
a26054d1 JL |
199 | static unsigned long |
200 | rqst_len(struct smb_rqst *rqst) | |
201 | { | |
202 | unsigned int i; | |
203 | struct kvec *iov = rqst->rq_iov; | |
204 | unsigned long buflen = 0; | |
205 | ||
206 | /* total up iov array first */ | |
207 | for (i = 0; i < rqst->rq_nvec; i++) | |
208 | buflen += iov[i].iov_len; | |
209 | ||
210 | /* add in the page array if there is one */ | |
211 | if (rqst->rq_npages) { | |
212 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1); | |
213 | buflen += rqst->rq_tailsz; | |
214 | } | |
215 | ||
216 | return buflen; | |
217 | } | |
218 | ||
6f49f46b | 219 | static int |
7fb8986e | 220 | __smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
6f49f46b JL |
221 | { |
222 | int rc; | |
223 | struct kvec *iov = rqst->rq_iov; | |
224 | int n_vec = rqst->rq_nvec; | |
225 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
a26054d1 | 226 | unsigned long send_length; |
97bc00b3 | 227 | unsigned int i; |
3ab3f2a1 | 228 | size_t total_len = 0, sent, size; |
b8eed283 | 229 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 230 | struct msghdr smb_msg; |
b8eed283 | 231 | int val = 1; |
6f49f46b | 232 | |
ea702b80 JL |
233 | if (ssocket == NULL) |
234 | return -ENOTSOCK; | |
235 | ||
a26054d1 JL |
236 | /* sanity check send length */ |
237 | send_length = rqst_len(rqst); | |
238 | if (send_length != smb_buf_length + 4) { | |
239 | WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n", | |
240 | send_length, smb_buf_length); | |
241 | return -EIO; | |
242 | } | |
243 | ||
738f9de5 PS |
244 | if (n_vec < 2) |
245 | return -EIO; | |
246 | ||
f96637be | 247 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
6f49f46b | 248 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
738f9de5 | 249 | dump_smb(iov[1].iov_base, iov[1].iov_len); |
6f49f46b | 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 | 311 | static int |
7fb8986e | 312 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst, int flags) |
6f49f46b | 313 | { |
7fb8986e PS |
314 | struct smb_rqst cur_rqst; |
315 | int rc; | |
316 | ||
317 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
318 | return __smb_send_rqst(server, rqst); | |
319 | ||
320 | if (!server->ops->init_transform_rq || | |
321 | !server->ops->free_transform_rq) { | |
322 | cifs_dbg(VFS, "Encryption requested but transform callbacks are missed\n"); | |
323 | return -EIO; | |
324 | } | |
6f49f46b | 325 | |
7fb8986e PS |
326 | rc = server->ops->init_transform_rq(server, &cur_rqst, rqst); |
327 | if (rc) | |
328 | return rc; | |
329 | ||
330 | rc = __smb_send_rqst(server, &cur_rqst); | |
331 | server->ops->free_transform_rq(&cur_rqst); | |
332 | return rc; | |
6f49f46b JL |
333 | } |
334 | ||
0496e02d JL |
335 | int |
336 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
337 | unsigned int smb_buf_length) | |
338 | { | |
738f9de5 | 339 | struct kvec iov[2]; |
7fb8986e PS |
340 | struct smb_rqst rqst = { .rq_iov = iov, |
341 | .rq_nvec = 2 }; | |
0496e02d | 342 | |
738f9de5 PS |
343 | iov[0].iov_base = smb_buffer; |
344 | iov[0].iov_len = 4; | |
345 | iov[1].iov_base = (char *)smb_buffer + 4; | |
346 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 347 | |
7fb8986e | 348 | return __smb_send_rqst(server, &rqst); |
0496e02d JL |
349 | } |
350 | ||
fc40f9cf | 351 | static int |
a891f0f8 | 352 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 353 | int *credits) |
1da177e4 | 354 | { |
5bc59498 PS |
355 | int rc; |
356 | ||
fc40f9cf | 357 | spin_lock(&server->req_lock); |
a891f0f8 | 358 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 359 | /* oplock breaks must not be held up */ |
fc40f9cf | 360 | server->in_flight++; |
bc205ed1 | 361 | *credits -= 1; |
fc40f9cf | 362 | spin_unlock(&server->req_lock); |
27a97a61 VL |
363 | return 0; |
364 | } | |
365 | ||
27a97a61 | 366 | while (1) { |
bc205ed1 | 367 | if (*credits <= 0) { |
fc40f9cf | 368 | spin_unlock(&server->req_lock); |
789e6661 | 369 | cifs_num_waiters_inc(server); |
5bc59498 | 370 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 371 | has_credits(server, credits)); |
789e6661 | 372 | cifs_num_waiters_dec(server); |
5bc59498 PS |
373 | if (rc) |
374 | return rc; | |
fc40f9cf | 375 | spin_lock(&server->req_lock); |
27a97a61 | 376 | } else { |
c5797a94 | 377 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 378 | spin_unlock(&server->req_lock); |
27a97a61 | 379 | return -ENOENT; |
1da177e4 | 380 | } |
27a97a61 | 381 | |
2d86dbc9 PS |
382 | /* |
383 | * Can not count locking commands against total | |
384 | * as they are allowed to block on server. | |
385 | */ | |
27a97a61 VL |
386 | |
387 | /* update # of requests on the wire to server */ | |
a891f0f8 | 388 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 389 | *credits -= 1; |
fc40f9cf | 390 | server->in_flight++; |
2d86dbc9 | 391 | } |
fc40f9cf | 392 | spin_unlock(&server->req_lock); |
27a97a61 | 393 | break; |
1da177e4 LT |
394 | } |
395 | } | |
7ee1af76 JA |
396 | return 0; |
397 | } | |
1da177e4 | 398 | |
bc205ed1 | 399 | static int |
a891f0f8 PS |
400 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
401 | const int optype) | |
bc205ed1 | 402 | { |
eb4c7df6 SP |
403 | int *val; |
404 | ||
405 | val = server->ops->get_credits_field(server, optype); | |
406 | /* Since an echo is already inflight, no need to wait to send another */ | |
407 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
408 | return -EAGAIN; | |
409 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
410 | } |
411 | ||
cb7e9eab PS |
412 | int |
413 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
414 | unsigned int *num, unsigned int *credits) | |
415 | { | |
416 | *num = size; | |
417 | *credits = 0; | |
418 | return 0; | |
419 | } | |
420 | ||
96daf2b0 | 421 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
422 | struct mid_q_entry **ppmidQ) |
423 | { | |
1da177e4 | 424 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 425 | return -ENOENT; |
8fbbd365 VL |
426 | } |
427 | ||
428 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 429 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 430 | return -EAGAIN; |
8fbbd365 VL |
431 | } |
432 | ||
7f48558e | 433 | if (ses->status == CifsNew) { |
79a58d1f | 434 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 435 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 436 | return -EAGAIN; |
ad7a2926 | 437 | /* else ok - we are setting up session */ |
1da177e4 | 438 | } |
7f48558e SP |
439 | |
440 | if (ses->status == CifsExiting) { | |
441 | /* check if SMB session is bad because we are setting it up */ | |
442 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
443 | return -EAGAIN; | |
444 | /* else ok - we are shutting down session */ | |
445 | } | |
446 | ||
24b9b06b | 447 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 448 | if (*ppmidQ == NULL) |
7ee1af76 | 449 | return -ENOMEM; |
ddc8cf8f JL |
450 | spin_lock(&GlobalMid_Lock); |
451 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
452 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
453 | return 0; |
454 | } | |
455 | ||
0ade640e JL |
456 | static int |
457 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 458 | { |
0ade640e | 459 | int error; |
7ee1af76 | 460 | |
5853cc2a | 461 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 462 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
463 | if (error < 0) |
464 | return -ERESTARTSYS; | |
7ee1af76 | 465 | |
0ade640e | 466 | return 0; |
7ee1af76 JA |
467 | } |
468 | ||
fec344e3 JL |
469 | struct mid_q_entry * |
470 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
471 | { |
472 | int rc; | |
fec344e3 | 473 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
474 | struct mid_q_entry *mid; |
475 | ||
738f9de5 PS |
476 | if (rqst->rq_iov[0].iov_len != 4 || |
477 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
478 | return ERR_PTR(-EIO); | |
479 | ||
792af7b0 | 480 | /* enable signing if server requires it */ |
38d77c50 | 481 | if (server->sign) |
792af7b0 PS |
482 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
483 | ||
484 | mid = AllocMidQEntry(hdr, server); | |
485 | if (mid == NULL) | |
fec344e3 | 486 | return ERR_PTR(-ENOMEM); |
792af7b0 | 487 | |
fec344e3 | 488 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
489 | if (rc) { |
490 | DeleteMidQEntry(mid); | |
fec344e3 | 491 | return ERR_PTR(rc); |
ffc61ccb SP |
492 | } |
493 | ||
fec344e3 | 494 | return mid; |
792af7b0 | 495 | } |
133672ef | 496 | |
a6827c18 JL |
497 | /* |
498 | * Send a SMB request and set the callback function in the mid to handle | |
499 | * the result. Caller is responsible for dealing with timeouts. | |
500 | */ | |
501 | int | |
fec344e3 | 502 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
503 | mid_receive_t *receive, mid_callback_t *callback, |
504 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 505 | { |
a891f0f8 | 506 | int rc, timeout, optype; |
a6827c18 | 507 | struct mid_q_entry *mid; |
cb7e9eab | 508 | unsigned int credits = 0; |
a6827c18 | 509 | |
a891f0f8 PS |
510 | timeout = flags & CIFS_TIMEOUT_MASK; |
511 | optype = flags & CIFS_OP_MASK; | |
512 | ||
cb7e9eab PS |
513 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
514 | rc = wait_for_free_request(server, timeout, optype); | |
515 | if (rc) | |
516 | return rc; | |
517 | credits = 1; | |
518 | } | |
a6827c18 JL |
519 | |
520 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
521 | mid = server->ops->setup_async_request(server, rqst); |
522 | if (IS_ERR(mid)) { | |
a6827c18 | 523 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 524 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 525 | return PTR_ERR(mid); |
a6827c18 JL |
526 | } |
527 | ||
44d22d84 | 528 | mid->receive = receive; |
a6827c18 JL |
529 | mid->callback = callback; |
530 | mid->callback_data = cbdata; | |
9b7c18a2 | 531 | mid->handle = handle; |
7c9421e1 | 532 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 533 | |
ffc61ccb SP |
534 | /* put it on the pending_mid_q */ |
535 | spin_lock(&GlobalMid_Lock); | |
536 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
537 | spin_unlock(&GlobalMid_Lock); | |
538 | ||
539 | ||
789e6661 | 540 | cifs_in_send_inc(server); |
7fb8986e | 541 | rc = smb_send_rqst(server, rqst, flags); |
789e6661 SF |
542 | cifs_in_send_dec(server); |
543 | cifs_save_when_sent(mid); | |
ad313cb8 | 544 | |
820962dc | 545 | if (rc < 0) { |
ad313cb8 | 546 | server->sequence_number -= 2; |
820962dc RV |
547 | cifs_delete_mid(mid); |
548 | } | |
549 | ||
a6827c18 | 550 | mutex_unlock(&server->srv_mutex); |
789e6661 | 551 | |
ffc61ccb SP |
552 | if (rc == 0) |
553 | return 0; | |
a6827c18 | 554 | |
cb7e9eab | 555 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
556 | return rc; |
557 | } | |
558 | ||
133672ef SF |
559 | /* |
560 | * | |
561 | * Send an SMB Request. No response info (other than return code) | |
562 | * needs to be parsed. | |
563 | * | |
564 | * flags indicate the type of request buffer and how long to wait | |
565 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
566 | * | |
567 | */ | |
568 | int | |
96daf2b0 | 569 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 570 | char *in_buf, int flags) |
133672ef SF |
571 | { |
572 | int rc; | |
573 | struct kvec iov[1]; | |
da502f7d | 574 | struct kvec rsp_iov; |
133672ef SF |
575 | int resp_buf_type; |
576 | ||
792af7b0 PS |
577 | iov[0].iov_base = in_buf; |
578 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 579 | flags |= CIFS_NO_RESP; |
da502f7d | 580 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 581 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 582 | |
133672ef SF |
583 | return rc; |
584 | } | |
585 | ||
053d5034 | 586 | static int |
3c1105df | 587 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
588 | { |
589 | int rc = 0; | |
590 | ||
f96637be JP |
591 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
592 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 593 | |
74dd92a8 | 594 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 595 | switch (mid->mid_state) { |
74dd92a8 | 596 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
597 | spin_unlock(&GlobalMid_Lock); |
598 | return rc; | |
74dd92a8 JL |
599 | case MID_RETRY_NEEDED: |
600 | rc = -EAGAIN; | |
601 | break; | |
71823baf JL |
602 | case MID_RESPONSE_MALFORMED: |
603 | rc = -EIO; | |
604 | break; | |
3c1105df JL |
605 | case MID_SHUTDOWN: |
606 | rc = -EHOSTDOWN; | |
607 | break; | |
74dd92a8 | 608 | default: |
3c1105df | 609 | list_del_init(&mid->qhead); |
f96637be JP |
610 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
611 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 612 | rc = -EIO; |
053d5034 JL |
613 | } |
614 | spin_unlock(&GlobalMid_Lock); | |
615 | ||
2b84a36c | 616 | DeleteMidQEntry(mid); |
053d5034 JL |
617 | return rc; |
618 | } | |
619 | ||
121b046a | 620 | static inline int |
fb2036d8 PS |
621 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
622 | struct mid_q_entry *mid) | |
76dcc26f | 623 | { |
121b046a | 624 | return server->ops->send_cancel ? |
fb2036d8 | 625 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
626 | } |
627 | ||
2c8f981d JL |
628 | int |
629 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
630 | bool log_error) | |
631 | { | |
792af7b0 | 632 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
633 | |
634 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
635 | |
636 | /* convert the length into a more usable form */ | |
38d77c50 | 637 | if (server->sign) { |
738f9de5 | 638 | struct kvec iov[2]; |
985e4ff0 | 639 | int rc = 0; |
738f9de5 PS |
640 | struct smb_rqst rqst = { .rq_iov = iov, |
641 | .rq_nvec = 2 }; | |
826a95e4 | 642 | |
738f9de5 PS |
643 | iov[0].iov_base = mid->resp_buf; |
644 | iov[0].iov_len = 4; | |
645 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
646 | iov[1].iov_len = len - 4; | |
2c8f981d | 647 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 648 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 649 | mid->sequence_number); |
985e4ff0 | 650 | if (rc) |
f96637be JP |
651 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
652 | rc); | |
2c8f981d JL |
653 | } |
654 | ||
655 | /* BB special case reconnect tid and uid here? */ | |
656 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
657 | } | |
658 | ||
fec344e3 JL |
659 | struct mid_q_entry * |
660 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
661 | { |
662 | int rc; | |
fec344e3 | 663 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
664 | struct mid_q_entry *mid; |
665 | ||
738f9de5 PS |
666 | if (rqst->rq_iov[0].iov_len != 4 || |
667 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
668 | return ERR_PTR(-EIO); | |
669 | ||
792af7b0 PS |
670 | rc = allocate_mid(ses, hdr, &mid); |
671 | if (rc) | |
fec344e3 JL |
672 | return ERR_PTR(rc); |
673 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
674 | if (rc) { | |
3c1bf7e4 | 675 | cifs_delete_mid(mid); |
fec344e3 JL |
676 | return ERR_PTR(rc); |
677 | } | |
678 | return mid; | |
792af7b0 PS |
679 | } |
680 | ||
b8f57ee8 | 681 | int |
738f9de5 PS |
682 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
683 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
684 | struct kvec *resp_iov) | |
7ee1af76 JA |
685 | { |
686 | int rc = 0; | |
a891f0f8 | 687 | int timeout, optype; |
7ee1af76 | 688 | struct mid_q_entry *midQ; |
a891f0f8 | 689 | unsigned int credits = 1; |
738f9de5 | 690 | char *buf; |
50c2f753 | 691 | |
a891f0f8 PS |
692 | timeout = flags & CIFS_TIMEOUT_MASK; |
693 | optype = flags & CIFS_OP_MASK; | |
133672ef | 694 | |
a891f0f8 | 695 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
696 | |
697 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 698 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
699 | return -EIO; |
700 | } | |
701 | ||
da502f7d | 702 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 703 | return -ENOENT; |
7ee1af76 | 704 | |
792af7b0 PS |
705 | /* |
706 | * Ensure that we do not send more than 50 overlapping requests | |
707 | * to the same server. We may make this configurable later or | |
708 | * use ses->maxReq. | |
709 | */ | |
7ee1af76 | 710 | |
a891f0f8 | 711 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 712 | if (rc) |
7ee1af76 | 713 | return rc; |
7ee1af76 | 714 | |
792af7b0 PS |
715 | /* |
716 | * Make sure that we sign in the same order that we send on this socket | |
717 | * and avoid races inside tcp sendmsg code that could cause corruption | |
718 | * of smb data. | |
719 | */ | |
7ee1af76 | 720 | |
72ca545b | 721 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 722 | |
738f9de5 | 723 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 724 | if (IS_ERR(midQ)) { |
72ca545b | 725 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 726 | /* Update # of requests on wire to server */ |
a891f0f8 | 727 | add_credits(ses->server, 1, optype); |
fec344e3 | 728 | return PTR_ERR(midQ); |
1da177e4 | 729 | } |
1da177e4 | 730 | |
7c9421e1 | 731 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 732 | cifs_in_send_inc(ses->server); |
7fb8986e | 733 | rc = smb_send_rqst(ses->server, rqst, flags); |
789e6661 SF |
734 | cifs_in_send_dec(ses->server); |
735 | cifs_save_when_sent(midQ); | |
7ee1af76 | 736 | |
ad313cb8 JL |
737 | if (rc < 0) |
738 | ses->server->sequence_number -= 2; | |
72ca545b | 739 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 740 | |
da502f7d | 741 | if (rc < 0) |
7ee1af76 | 742 | goto out; |
4b8f930f | 743 | |
da502f7d | 744 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 745 | goto out; |
d6e04ae6 | 746 | |
0ade640e | 747 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 748 | if (rc != 0) { |
38bd4906 | 749 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid); |
738f9de5 | 750 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 751 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 752 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
38bd4906 | 753 | midQ->mid_flags |= MID_WAIT_CANCELLED; |
1be912dd JL |
754 | midQ->callback = DeleteMidQEntry; |
755 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 756 | add_credits(ses->server, 1, optype); |
1be912dd JL |
757 | return rc; |
758 | } | |
759 | spin_unlock(&GlobalMid_Lock); | |
760 | } | |
d6e04ae6 | 761 | |
3c1105df | 762 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 763 | if (rc != 0) { |
a891f0f8 | 764 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
765 | return rc; |
766 | } | |
50c2f753 | 767 | |
7c9421e1 | 768 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 769 | rc = -EIO; |
f96637be | 770 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
771 | goto out; |
772 | } | |
773 | ||
792af7b0 | 774 | buf = (char *)midQ->resp_buf; |
da502f7d PS |
775 | resp_iov->iov_base = buf; |
776 | resp_iov->iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 777 | if (midQ->large_buf) |
a891f0f8 | 778 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 779 | else |
a891f0f8 PS |
780 | *resp_buf_type = CIFS_SMALL_BUFFER; |
781 | ||
782 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 783 | |
082d0642 PS |
784 | rc = ses->server->ops->check_receive(midQ, ses->server, |
785 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 786 | |
3c1bf7e4 | 787 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
788 | if ((flags & CIFS_NO_RESP) == 0) |
789 | midQ->resp_buf = NULL; | |
7ee1af76 | 790 | out: |
3c1bf7e4 | 791 | cifs_delete_mid(midQ); |
a891f0f8 | 792 | add_credits(ses->server, credits, optype); |
1da177e4 | 793 | |
d6e04ae6 SF |
794 | return rc; |
795 | } | |
1da177e4 | 796 | |
738f9de5 PS |
797 | int |
798 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
799 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
800 | const int flags, struct kvec *resp_iov) | |
801 | { | |
802 | struct smb_rqst rqst; | |
803 | struct kvec *new_iov; | |
804 | int rc; | |
805 | ||
806 | new_iov = kmalloc(sizeof(struct kvec) * (n_vec + 1), GFP_KERNEL); | |
807 | if (!new_iov) | |
808 | return -ENOMEM; | |
809 | ||
810 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
811 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
812 | ||
813 | new_iov[0].iov_base = new_iov[1].iov_base; | |
814 | new_iov[0].iov_len = 4; | |
815 | new_iov[1].iov_base += 4; | |
816 | new_iov[1].iov_len -= 4; | |
817 | ||
818 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
819 | rqst.rq_iov = new_iov; | |
820 | rqst.rq_nvec = n_vec + 1; | |
821 | ||
822 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
823 | kfree(new_iov); | |
824 | return rc; | |
825 | } | |
826 | ||
1da177e4 | 827 | int |
96daf2b0 | 828 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 829 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 830 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
831 | { |
832 | int rc = 0; | |
1da177e4 | 833 | struct mid_q_entry *midQ; |
fb2036d8 PS |
834 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
835 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
836 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
837 | |
838 | if (ses == NULL) { | |
f96637be | 839 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
840 | return -EIO; |
841 | } | |
79a58d1f | 842 | if (ses->server == NULL) { |
f96637be | 843 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
844 | return -EIO; |
845 | } | |
846 | ||
79a58d1f | 847 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
848 | return -ENOENT; |
849 | ||
79a58d1f | 850 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
851 | to the same server. We may make this configurable later or |
852 | use ses->maxReq */ | |
1da177e4 | 853 | |
fb2036d8 | 854 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 855 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 856 | len); |
6d9c6d54 VL |
857 | return -EIO; |
858 | } | |
859 | ||
a891f0f8 | 860 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
861 | if (rc) |
862 | return rc; | |
863 | ||
79a58d1f | 864 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
865 | and avoid races inside tcp sendmsg code that could cause corruption |
866 | of smb data */ | |
867 | ||
72ca545b | 868 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 869 | |
7ee1af76 JA |
870 | rc = allocate_mid(ses, in_buf, &midQ); |
871 | if (rc) { | |
72ca545b | 872 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 873 | /* Update # of requests on wire to server */ |
a891f0f8 | 874 | add_credits(ses->server, 1, 0); |
7ee1af76 | 875 | return rc; |
1da177e4 LT |
876 | } |
877 | ||
ad009ac9 | 878 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
879 | if (rc) { |
880 | mutex_unlock(&ses->server->srv_mutex); | |
881 | goto out; | |
882 | } | |
1da177e4 | 883 | |
7c9421e1 | 884 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
885 | |
886 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 887 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
888 | cifs_in_send_dec(ses->server); |
889 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
890 | |
891 | if (rc < 0) | |
892 | ses->server->sequence_number -= 2; | |
893 | ||
72ca545b | 894 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 895 | |
79a58d1f | 896 | if (rc < 0) |
7ee1af76 JA |
897 | goto out; |
898 | ||
a891f0f8 | 899 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 900 | goto out; |
1da177e4 | 901 | |
0ade640e | 902 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 903 | if (rc != 0) { |
fb2036d8 | 904 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 905 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 906 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
907 | /* no longer considered to be "in-flight" */ |
908 | midQ->callback = DeleteMidQEntry; | |
909 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 910 | add_credits(ses->server, 1, 0); |
1be912dd JL |
911 | return rc; |
912 | } | |
913 | spin_unlock(&GlobalMid_Lock); | |
914 | } | |
1da177e4 | 915 | |
3c1105df | 916 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 917 | if (rc != 0) { |
a891f0f8 | 918 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
919 | return rc; |
920 | } | |
50c2f753 | 921 | |
2c8f981d | 922 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 923 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 924 | rc = -EIO; |
f96637be | 925 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 926 | goto out; |
1da177e4 | 927 | } |
7ee1af76 | 928 | |
d4e4854f | 929 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
930 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
931 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 932 | out: |
3c1bf7e4 | 933 | cifs_delete_mid(midQ); |
a891f0f8 | 934 | add_credits(ses->server, 1, 0); |
1da177e4 | 935 | |
7ee1af76 JA |
936 | return rc; |
937 | } | |
1da177e4 | 938 | |
7ee1af76 JA |
939 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
940 | blocking lock to return. */ | |
941 | ||
942 | static int | |
96daf2b0 | 943 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
944 | struct smb_hdr *in_buf, |
945 | struct smb_hdr *out_buf) | |
946 | { | |
947 | int bytes_returned; | |
96daf2b0 | 948 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
949 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
950 | ||
951 | /* We just modify the current in_buf to change | |
952 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
953 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
954 | LOCKING_ANDX_CANCEL_LOCK. */ | |
955 | ||
956 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
957 | pSMB->Timeout = 0; | |
88257360 | 958 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
959 | |
960 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 961 | &bytes_returned, 0); |
7ee1af76 JA |
962 | } |
963 | ||
964 | int | |
96daf2b0 | 965 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
966 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
967 | int *pbytes_returned) | |
968 | { | |
969 | int rc = 0; | |
970 | int rstart = 0; | |
7ee1af76 | 971 | struct mid_q_entry *midQ; |
96daf2b0 | 972 | struct cifs_ses *ses; |
fb2036d8 PS |
973 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
974 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
975 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
976 | |
977 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 978 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
979 | return -EIO; |
980 | } | |
981 | ses = tcon->ses; | |
982 | ||
79a58d1f | 983 | if (ses->server == NULL) { |
f96637be | 984 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
985 | return -EIO; |
986 | } | |
987 | ||
79a58d1f | 988 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
989 | return -ENOENT; |
990 | ||
79a58d1f | 991 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
992 | to the same server. We may make this configurable later or |
993 | use ses->maxReq */ | |
994 | ||
fb2036d8 | 995 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 996 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 997 | len); |
6d9c6d54 VL |
998 | return -EIO; |
999 | } | |
1000 | ||
a891f0f8 | 1001 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1002 | if (rc) |
1003 | return rc; | |
1004 | ||
79a58d1f | 1005 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1006 | and avoid races inside tcp sendmsg code that could cause corruption |
1007 | of smb data */ | |
1008 | ||
72ca545b | 1009 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1010 | |
1011 | rc = allocate_mid(ses, in_buf, &midQ); | |
1012 | if (rc) { | |
72ca545b | 1013 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1014 | return rc; |
1015 | } | |
1016 | ||
7ee1af76 | 1017 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1018 | if (rc) { |
3c1bf7e4 | 1019 | cifs_delete_mid(midQ); |
829049cb VL |
1020 | mutex_unlock(&ses->server->srv_mutex); |
1021 | return rc; | |
1022 | } | |
1da177e4 | 1023 | |
7c9421e1 | 1024 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1025 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1026 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1027 | cifs_in_send_dec(ses->server); |
1028 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1029 | |
1030 | if (rc < 0) | |
1031 | ses->server->sequence_number -= 2; | |
1032 | ||
72ca545b | 1033 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1034 | |
79a58d1f | 1035 | if (rc < 0) { |
3c1bf7e4 | 1036 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1037 | return rc; |
1038 | } | |
1039 | ||
1040 | /* Wait for a reply - allow signals to interrupt. */ | |
1041 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1042 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1043 | ((ses->server->tcpStatus != CifsGood) && |
1044 | (ses->server->tcpStatus != CifsNew))); | |
1045 | ||
1046 | /* Were we interrupted by a signal ? */ | |
1047 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1048 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1049 | ((ses->server->tcpStatus == CifsGood) || |
1050 | (ses->server->tcpStatus == CifsNew))) { | |
1051 | ||
1052 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1053 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1054 | blocking lock to return. */ | |
fb2036d8 | 1055 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1056 | if (rc) { |
3c1bf7e4 | 1057 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1058 | return rc; |
1059 | } | |
1060 | } else { | |
1061 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1062 | to cause the blocking lock to return. */ | |
1063 | ||
1064 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1065 | ||
1066 | /* If we get -ENOLCK back the lock may have | |
1067 | already been removed. Don't exit in this case. */ | |
1068 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1069 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1070 | return rc; |
1071 | } | |
1072 | } | |
1073 | ||
1be912dd JL |
1074 | rc = wait_for_response(ses->server, midQ); |
1075 | if (rc) { | |
fb2036d8 | 1076 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1077 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1078 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1079 | /* no longer considered to be "in-flight" */ |
1080 | midQ->callback = DeleteMidQEntry; | |
1081 | spin_unlock(&GlobalMid_Lock); | |
1082 | return rc; | |
1083 | } | |
1084 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1085 | } |
1be912dd JL |
1086 | |
1087 | /* We got the response - restart system call. */ | |
1088 | rstart = 1; | |
7ee1af76 JA |
1089 | } |
1090 | ||
3c1105df | 1091 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1092 | if (rc != 0) |
7ee1af76 | 1093 | return rc; |
50c2f753 | 1094 | |
17c8bfed | 1095 | /* rcvd frame is ok */ |
7c9421e1 | 1096 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1097 | rc = -EIO; |
f96637be | 1098 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1099 | goto out; |
1100 | } | |
1da177e4 | 1101 | |
d4e4854f | 1102 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1103 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1104 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1105 | out: |
3c1bf7e4 | 1106 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1107 | if (rstart && rc == -EACCES) |
1108 | return -ERESTARTSYS; | |
1da177e4 LT |
1109 | return rc; |
1110 | } |