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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 | 223 | static int |
7fb8986e | 224 | __smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
6f49f46b JL |
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 | 315 | static int |
7fb8986e | 316 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst, int flags) |
6f49f46b | 317 | { |
7fb8986e PS |
318 | struct smb_rqst cur_rqst; |
319 | int rc; | |
320 | ||
321 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
322 | return __smb_send_rqst(server, rqst); | |
323 | ||
324 | if (!server->ops->init_transform_rq || | |
325 | !server->ops->free_transform_rq) { | |
326 | cifs_dbg(VFS, "Encryption requested but transform callbacks are missed\n"); | |
327 | return -EIO; | |
328 | } | |
6f49f46b | 329 | |
7fb8986e PS |
330 | rc = server->ops->init_transform_rq(server, &cur_rqst, rqst); |
331 | if (rc) | |
332 | return rc; | |
333 | ||
334 | rc = __smb_send_rqst(server, &cur_rqst); | |
335 | server->ops->free_transform_rq(&cur_rqst); | |
336 | return rc; | |
6f49f46b JL |
337 | } |
338 | ||
0496e02d JL |
339 | int |
340 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
341 | unsigned int smb_buf_length) | |
342 | { | |
738f9de5 | 343 | struct kvec iov[2]; |
7fb8986e PS |
344 | struct smb_rqst rqst = { .rq_iov = iov, |
345 | .rq_nvec = 2 }; | |
0496e02d | 346 | |
738f9de5 PS |
347 | iov[0].iov_base = smb_buffer; |
348 | iov[0].iov_len = 4; | |
349 | iov[1].iov_base = (char *)smb_buffer + 4; | |
350 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 351 | |
7fb8986e | 352 | return __smb_send_rqst(server, &rqst); |
0496e02d JL |
353 | } |
354 | ||
fc40f9cf | 355 | static int |
a891f0f8 | 356 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 357 | int *credits) |
1da177e4 | 358 | { |
5bc59498 PS |
359 | int rc; |
360 | ||
fc40f9cf | 361 | spin_lock(&server->req_lock); |
a891f0f8 | 362 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 363 | /* oplock breaks must not be held up */ |
fc40f9cf | 364 | server->in_flight++; |
bc205ed1 | 365 | *credits -= 1; |
fc40f9cf | 366 | spin_unlock(&server->req_lock); |
27a97a61 VL |
367 | return 0; |
368 | } | |
369 | ||
27a97a61 | 370 | while (1) { |
bc205ed1 | 371 | if (*credits <= 0) { |
fc40f9cf | 372 | spin_unlock(&server->req_lock); |
789e6661 | 373 | cifs_num_waiters_inc(server); |
5bc59498 | 374 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 375 | has_credits(server, credits)); |
789e6661 | 376 | cifs_num_waiters_dec(server); |
5bc59498 PS |
377 | if (rc) |
378 | return rc; | |
fc40f9cf | 379 | spin_lock(&server->req_lock); |
27a97a61 | 380 | } else { |
c5797a94 | 381 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 382 | spin_unlock(&server->req_lock); |
27a97a61 | 383 | return -ENOENT; |
1da177e4 | 384 | } |
27a97a61 | 385 | |
2d86dbc9 PS |
386 | /* |
387 | * Can not count locking commands against total | |
388 | * as they are allowed to block on server. | |
389 | */ | |
27a97a61 VL |
390 | |
391 | /* update # of requests on the wire to server */ | |
a891f0f8 | 392 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 393 | *credits -= 1; |
fc40f9cf | 394 | server->in_flight++; |
2d86dbc9 | 395 | } |
fc40f9cf | 396 | spin_unlock(&server->req_lock); |
27a97a61 | 397 | break; |
1da177e4 LT |
398 | } |
399 | } | |
7ee1af76 JA |
400 | return 0; |
401 | } | |
1da177e4 | 402 | |
bc205ed1 | 403 | static int |
a891f0f8 PS |
404 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
405 | const int optype) | |
bc205ed1 | 406 | { |
eb4c7df6 SP |
407 | int *val; |
408 | ||
409 | val = server->ops->get_credits_field(server, optype); | |
410 | /* Since an echo is already inflight, no need to wait to send another */ | |
411 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
412 | return -EAGAIN; | |
413 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
414 | } |
415 | ||
cb7e9eab PS |
416 | int |
417 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
418 | unsigned int *num, unsigned int *credits) | |
419 | { | |
420 | *num = size; | |
421 | *credits = 0; | |
422 | return 0; | |
423 | } | |
424 | ||
96daf2b0 | 425 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
426 | struct mid_q_entry **ppmidQ) |
427 | { | |
1da177e4 | 428 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 429 | return -ENOENT; |
8fbbd365 VL |
430 | } |
431 | ||
432 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 433 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 434 | return -EAGAIN; |
8fbbd365 VL |
435 | } |
436 | ||
7f48558e | 437 | if (ses->status == CifsNew) { |
79a58d1f | 438 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 439 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 440 | return -EAGAIN; |
ad7a2926 | 441 | /* else ok - we are setting up session */ |
1da177e4 | 442 | } |
7f48558e SP |
443 | |
444 | if (ses->status == CifsExiting) { | |
445 | /* check if SMB session is bad because we are setting it up */ | |
446 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
447 | return -EAGAIN; | |
448 | /* else ok - we are shutting down session */ | |
449 | } | |
450 | ||
24b9b06b | 451 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 452 | if (*ppmidQ == NULL) |
7ee1af76 | 453 | return -ENOMEM; |
ddc8cf8f JL |
454 | spin_lock(&GlobalMid_Lock); |
455 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
456 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
457 | return 0; |
458 | } | |
459 | ||
0ade640e JL |
460 | static int |
461 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 462 | { |
0ade640e | 463 | int error; |
7ee1af76 | 464 | |
5853cc2a | 465 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 466 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
467 | if (error < 0) |
468 | return -ERESTARTSYS; | |
7ee1af76 | 469 | |
0ade640e | 470 | return 0; |
7ee1af76 JA |
471 | } |
472 | ||
fec344e3 JL |
473 | struct mid_q_entry * |
474 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
475 | { |
476 | int rc; | |
fec344e3 | 477 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
478 | struct mid_q_entry *mid; |
479 | ||
738f9de5 PS |
480 | if (rqst->rq_iov[0].iov_len != 4 || |
481 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
482 | return ERR_PTR(-EIO); | |
483 | ||
792af7b0 | 484 | /* enable signing if server requires it */ |
38d77c50 | 485 | if (server->sign) |
792af7b0 PS |
486 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
487 | ||
488 | mid = AllocMidQEntry(hdr, server); | |
489 | if (mid == NULL) | |
fec344e3 | 490 | return ERR_PTR(-ENOMEM); |
792af7b0 | 491 | |
fec344e3 | 492 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
493 | if (rc) { |
494 | DeleteMidQEntry(mid); | |
fec344e3 | 495 | return ERR_PTR(rc); |
ffc61ccb SP |
496 | } |
497 | ||
fec344e3 | 498 | return mid; |
792af7b0 | 499 | } |
133672ef | 500 | |
a6827c18 JL |
501 | /* |
502 | * Send a SMB request and set the callback function in the mid to handle | |
503 | * the result. Caller is responsible for dealing with timeouts. | |
504 | */ | |
505 | int | |
fec344e3 | 506 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
507 | mid_receive_t *receive, mid_callback_t *callback, |
508 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 509 | { |
a891f0f8 | 510 | int rc, timeout, optype; |
a6827c18 | 511 | struct mid_q_entry *mid; |
cb7e9eab | 512 | unsigned int credits = 0; |
a6827c18 | 513 | |
a891f0f8 PS |
514 | timeout = flags & CIFS_TIMEOUT_MASK; |
515 | optype = flags & CIFS_OP_MASK; | |
516 | ||
cb7e9eab PS |
517 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
518 | rc = wait_for_free_request(server, timeout, optype); | |
519 | if (rc) | |
520 | return rc; | |
521 | credits = 1; | |
522 | } | |
a6827c18 JL |
523 | |
524 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
525 | mid = server->ops->setup_async_request(server, rqst); |
526 | if (IS_ERR(mid)) { | |
a6827c18 | 527 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 528 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 529 | return PTR_ERR(mid); |
a6827c18 JL |
530 | } |
531 | ||
44d22d84 | 532 | mid->receive = receive; |
a6827c18 JL |
533 | mid->callback = callback; |
534 | mid->callback_data = cbdata; | |
9b7c18a2 | 535 | mid->handle = handle; |
7c9421e1 | 536 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 537 | |
ffc61ccb SP |
538 | /* put it on the pending_mid_q */ |
539 | spin_lock(&GlobalMid_Lock); | |
540 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
541 | spin_unlock(&GlobalMid_Lock); | |
542 | ||
543 | ||
789e6661 | 544 | cifs_in_send_inc(server); |
7fb8986e | 545 | rc = smb_send_rqst(server, rqst, flags); |
789e6661 SF |
546 | cifs_in_send_dec(server); |
547 | cifs_save_when_sent(mid); | |
ad313cb8 | 548 | |
820962dc | 549 | if (rc < 0) { |
ad313cb8 | 550 | server->sequence_number -= 2; |
820962dc RV |
551 | cifs_delete_mid(mid); |
552 | } | |
553 | ||
a6827c18 | 554 | mutex_unlock(&server->srv_mutex); |
789e6661 | 555 | |
ffc61ccb SP |
556 | if (rc == 0) |
557 | return 0; | |
a6827c18 | 558 | |
cb7e9eab | 559 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
560 | return rc; |
561 | } | |
562 | ||
133672ef SF |
563 | /* |
564 | * | |
565 | * Send an SMB Request. No response info (other than return code) | |
566 | * needs to be parsed. | |
567 | * | |
568 | * flags indicate the type of request buffer and how long to wait | |
569 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
570 | * | |
571 | */ | |
572 | int | |
96daf2b0 | 573 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 574 | char *in_buf, int flags) |
133672ef SF |
575 | { |
576 | int rc; | |
577 | struct kvec iov[1]; | |
da502f7d | 578 | struct kvec rsp_iov; |
133672ef SF |
579 | int resp_buf_type; |
580 | ||
792af7b0 PS |
581 | iov[0].iov_base = in_buf; |
582 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 583 | flags |= CIFS_NO_RESP; |
da502f7d | 584 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 585 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 586 | |
133672ef SF |
587 | return rc; |
588 | } | |
589 | ||
053d5034 | 590 | static int |
3c1105df | 591 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
592 | { |
593 | int rc = 0; | |
594 | ||
f96637be JP |
595 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
596 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 597 | |
74dd92a8 | 598 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 599 | switch (mid->mid_state) { |
74dd92a8 | 600 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
601 | spin_unlock(&GlobalMid_Lock); |
602 | return rc; | |
74dd92a8 JL |
603 | case MID_RETRY_NEEDED: |
604 | rc = -EAGAIN; | |
605 | break; | |
71823baf JL |
606 | case MID_RESPONSE_MALFORMED: |
607 | rc = -EIO; | |
608 | break; | |
3c1105df JL |
609 | case MID_SHUTDOWN: |
610 | rc = -EHOSTDOWN; | |
611 | break; | |
74dd92a8 | 612 | default: |
3c1105df | 613 | list_del_init(&mid->qhead); |
f96637be JP |
614 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
615 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 616 | rc = -EIO; |
053d5034 JL |
617 | } |
618 | spin_unlock(&GlobalMid_Lock); | |
619 | ||
5fb4e288 | 620 | mutex_lock(&server->srv_mutex); |
2b84a36c | 621 | DeleteMidQEntry(mid); |
5fb4e288 | 622 | mutex_unlock(&server->srv_mutex); |
053d5034 JL |
623 | return rc; |
624 | } | |
625 | ||
121b046a | 626 | static inline int |
fb2036d8 PS |
627 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
628 | struct mid_q_entry *mid) | |
76dcc26f | 629 | { |
121b046a | 630 | return server->ops->send_cancel ? |
fb2036d8 | 631 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
632 | } |
633 | ||
2c8f981d JL |
634 | int |
635 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
636 | bool log_error) | |
637 | { | |
792af7b0 | 638 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
639 | |
640 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
641 | |
642 | /* convert the length into a more usable form */ | |
38d77c50 | 643 | if (server->sign) { |
738f9de5 | 644 | struct kvec iov[2]; |
985e4ff0 | 645 | int rc = 0; |
738f9de5 PS |
646 | struct smb_rqst rqst = { .rq_iov = iov, |
647 | .rq_nvec = 2 }; | |
826a95e4 | 648 | |
738f9de5 PS |
649 | iov[0].iov_base = mid->resp_buf; |
650 | iov[0].iov_len = 4; | |
651 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
652 | iov[1].iov_len = len - 4; | |
2c8f981d | 653 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 654 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 655 | mid->sequence_number); |
985e4ff0 | 656 | if (rc) |
f96637be JP |
657 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
658 | rc); | |
2c8f981d JL |
659 | } |
660 | ||
661 | /* BB special case reconnect tid and uid here? */ | |
662 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
663 | } | |
664 | ||
fec344e3 JL |
665 | struct mid_q_entry * |
666 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
667 | { |
668 | int rc; | |
fec344e3 | 669 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
670 | struct mid_q_entry *mid; |
671 | ||
738f9de5 PS |
672 | if (rqst->rq_iov[0].iov_len != 4 || |
673 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
674 | return ERR_PTR(-EIO); | |
675 | ||
792af7b0 PS |
676 | rc = allocate_mid(ses, hdr, &mid); |
677 | if (rc) | |
fec344e3 JL |
678 | return ERR_PTR(rc); |
679 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
680 | if (rc) { | |
3c1bf7e4 | 681 | cifs_delete_mid(mid); |
fec344e3 JL |
682 | return ERR_PTR(rc); |
683 | } | |
684 | return mid; | |
792af7b0 PS |
685 | } |
686 | ||
b8f57ee8 | 687 | int |
738f9de5 PS |
688 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
689 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
690 | struct kvec *resp_iov) | |
7ee1af76 JA |
691 | { |
692 | int rc = 0; | |
a891f0f8 | 693 | int timeout, optype; |
7ee1af76 | 694 | struct mid_q_entry *midQ; |
a891f0f8 | 695 | unsigned int credits = 1; |
738f9de5 | 696 | char *buf; |
50c2f753 | 697 | |
a891f0f8 PS |
698 | timeout = flags & CIFS_TIMEOUT_MASK; |
699 | optype = flags & CIFS_OP_MASK; | |
133672ef | 700 | |
a891f0f8 | 701 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
702 | |
703 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 704 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
705 | return -EIO; |
706 | } | |
707 | ||
da502f7d | 708 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 709 | return -ENOENT; |
7ee1af76 | 710 | |
792af7b0 PS |
711 | /* |
712 | * Ensure that we do not send more than 50 overlapping requests | |
713 | * to the same server. We may make this configurable later or | |
714 | * use ses->maxReq. | |
715 | */ | |
7ee1af76 | 716 | |
a891f0f8 | 717 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 718 | if (rc) |
7ee1af76 | 719 | return rc; |
7ee1af76 | 720 | |
792af7b0 PS |
721 | /* |
722 | * Make sure that we sign in the same order that we send on this socket | |
723 | * and avoid races inside tcp sendmsg code that could cause corruption | |
724 | * of smb data. | |
725 | */ | |
7ee1af76 | 726 | |
72ca545b | 727 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 728 | |
738f9de5 | 729 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 730 | if (IS_ERR(midQ)) { |
72ca545b | 731 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 732 | /* Update # of requests on wire to server */ |
a891f0f8 | 733 | add_credits(ses->server, 1, optype); |
fec344e3 | 734 | return PTR_ERR(midQ); |
1da177e4 | 735 | } |
1da177e4 | 736 | |
7c9421e1 | 737 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 738 | cifs_in_send_inc(ses->server); |
7fb8986e | 739 | rc = smb_send_rqst(ses->server, rqst, flags); |
789e6661 SF |
740 | cifs_in_send_dec(ses->server); |
741 | cifs_save_when_sent(midQ); | |
7ee1af76 | 742 | |
ad313cb8 JL |
743 | if (rc < 0) |
744 | ses->server->sequence_number -= 2; | |
72ca545b | 745 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 746 | |
da502f7d | 747 | if (rc < 0) |
7ee1af76 | 748 | goto out; |
4b8f930f | 749 | |
da502f7d | 750 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 751 | goto out; |
d6e04ae6 | 752 | |
0ade640e | 753 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 754 | if (rc != 0) { |
38bd4906 | 755 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid); |
738f9de5 | 756 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 757 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 758 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
38bd4906 | 759 | midQ->mid_flags |= MID_WAIT_CANCELLED; |
1be912dd JL |
760 | midQ->callback = DeleteMidQEntry; |
761 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 762 | add_credits(ses->server, 1, optype); |
1be912dd JL |
763 | return rc; |
764 | } | |
765 | spin_unlock(&GlobalMid_Lock); | |
766 | } | |
d6e04ae6 | 767 | |
3c1105df | 768 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 769 | if (rc != 0) { |
a891f0f8 | 770 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
771 | return rc; |
772 | } | |
50c2f753 | 773 | |
7c9421e1 | 774 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 775 | rc = -EIO; |
f96637be | 776 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
777 | goto out; |
778 | } | |
779 | ||
792af7b0 | 780 | buf = (char *)midQ->resp_buf; |
da502f7d PS |
781 | resp_iov->iov_base = buf; |
782 | resp_iov->iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 783 | if (midQ->large_buf) |
a891f0f8 | 784 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 785 | else |
a891f0f8 PS |
786 | *resp_buf_type = CIFS_SMALL_BUFFER; |
787 | ||
788 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 789 | |
082d0642 PS |
790 | rc = ses->server->ops->check_receive(midQ, ses->server, |
791 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 792 | |
3c1bf7e4 | 793 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
794 | if ((flags & CIFS_NO_RESP) == 0) |
795 | midQ->resp_buf = NULL; | |
7ee1af76 | 796 | out: |
3c1bf7e4 | 797 | cifs_delete_mid(midQ); |
a891f0f8 | 798 | add_credits(ses->server, credits, optype); |
1da177e4 | 799 | |
d6e04ae6 SF |
800 | return rc; |
801 | } | |
1da177e4 | 802 | |
738f9de5 PS |
803 | int |
804 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
805 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
806 | const int flags, struct kvec *resp_iov) | |
807 | { | |
808 | struct smb_rqst rqst; | |
809 | struct kvec *new_iov; | |
810 | int rc; | |
811 | ||
812 | new_iov = kmalloc(sizeof(struct kvec) * (n_vec + 1), GFP_KERNEL); | |
813 | if (!new_iov) | |
814 | return -ENOMEM; | |
815 | ||
816 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
817 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
818 | ||
819 | new_iov[0].iov_base = new_iov[1].iov_base; | |
820 | new_iov[0].iov_len = 4; | |
821 | new_iov[1].iov_base += 4; | |
822 | new_iov[1].iov_len -= 4; | |
823 | ||
824 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
825 | rqst.rq_iov = new_iov; | |
826 | rqst.rq_nvec = n_vec + 1; | |
827 | ||
828 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
829 | kfree(new_iov); | |
830 | return rc; | |
831 | } | |
832 | ||
1da177e4 | 833 | int |
96daf2b0 | 834 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 835 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 836 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
837 | { |
838 | int rc = 0; | |
1da177e4 | 839 | struct mid_q_entry *midQ; |
fb2036d8 PS |
840 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
841 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
842 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
843 | |
844 | if (ses == NULL) { | |
f96637be | 845 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
846 | return -EIO; |
847 | } | |
79a58d1f | 848 | if (ses->server == NULL) { |
f96637be | 849 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
850 | return -EIO; |
851 | } | |
852 | ||
79a58d1f | 853 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
854 | return -ENOENT; |
855 | ||
79a58d1f | 856 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
857 | to the same server. We may make this configurable later or |
858 | use ses->maxReq */ | |
1da177e4 | 859 | |
fb2036d8 | 860 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 861 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 862 | len); |
6d9c6d54 VL |
863 | return -EIO; |
864 | } | |
865 | ||
a891f0f8 | 866 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
867 | if (rc) |
868 | return rc; | |
869 | ||
79a58d1f | 870 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
871 | and avoid races inside tcp sendmsg code that could cause corruption |
872 | of smb data */ | |
873 | ||
72ca545b | 874 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 875 | |
7ee1af76 JA |
876 | rc = allocate_mid(ses, in_buf, &midQ); |
877 | if (rc) { | |
72ca545b | 878 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 879 | /* Update # of requests on wire to server */ |
a891f0f8 | 880 | add_credits(ses->server, 1, 0); |
7ee1af76 | 881 | return rc; |
1da177e4 LT |
882 | } |
883 | ||
ad009ac9 | 884 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
885 | if (rc) { |
886 | mutex_unlock(&ses->server->srv_mutex); | |
887 | goto out; | |
888 | } | |
1da177e4 | 889 | |
7c9421e1 | 890 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
891 | |
892 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 893 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
894 | cifs_in_send_dec(ses->server); |
895 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
896 | |
897 | if (rc < 0) | |
898 | ses->server->sequence_number -= 2; | |
899 | ||
72ca545b | 900 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 901 | |
79a58d1f | 902 | if (rc < 0) |
7ee1af76 JA |
903 | goto out; |
904 | ||
a891f0f8 | 905 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 906 | goto out; |
1da177e4 | 907 | |
0ade640e | 908 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 909 | if (rc != 0) { |
fb2036d8 | 910 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 911 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 912 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
913 | /* no longer considered to be "in-flight" */ |
914 | midQ->callback = DeleteMidQEntry; | |
915 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 916 | add_credits(ses->server, 1, 0); |
1be912dd JL |
917 | return rc; |
918 | } | |
919 | spin_unlock(&GlobalMid_Lock); | |
920 | } | |
1da177e4 | 921 | |
3c1105df | 922 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 923 | if (rc != 0) { |
a891f0f8 | 924 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
925 | return rc; |
926 | } | |
50c2f753 | 927 | |
2c8f981d | 928 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 929 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 930 | rc = -EIO; |
f96637be | 931 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 932 | goto out; |
1da177e4 | 933 | } |
7ee1af76 | 934 | |
d4e4854f | 935 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
936 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
937 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 938 | out: |
3c1bf7e4 | 939 | cifs_delete_mid(midQ); |
a891f0f8 | 940 | add_credits(ses->server, 1, 0); |
1da177e4 | 941 | |
7ee1af76 JA |
942 | return rc; |
943 | } | |
1da177e4 | 944 | |
7ee1af76 JA |
945 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
946 | blocking lock to return. */ | |
947 | ||
948 | static int | |
96daf2b0 | 949 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
950 | struct smb_hdr *in_buf, |
951 | struct smb_hdr *out_buf) | |
952 | { | |
953 | int bytes_returned; | |
96daf2b0 | 954 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
955 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
956 | ||
957 | /* We just modify the current in_buf to change | |
958 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
959 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
960 | LOCKING_ANDX_CANCEL_LOCK. */ | |
961 | ||
962 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
963 | pSMB->Timeout = 0; | |
88257360 | 964 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
965 | |
966 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 967 | &bytes_returned, 0); |
7ee1af76 JA |
968 | } |
969 | ||
970 | int | |
96daf2b0 | 971 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
972 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
973 | int *pbytes_returned) | |
974 | { | |
975 | int rc = 0; | |
976 | int rstart = 0; | |
7ee1af76 | 977 | struct mid_q_entry *midQ; |
96daf2b0 | 978 | struct cifs_ses *ses; |
fb2036d8 PS |
979 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
980 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
981 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
982 | |
983 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 984 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
985 | return -EIO; |
986 | } | |
987 | ses = tcon->ses; | |
988 | ||
79a58d1f | 989 | if (ses->server == NULL) { |
f96637be | 990 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
991 | return -EIO; |
992 | } | |
993 | ||
79a58d1f | 994 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
995 | return -ENOENT; |
996 | ||
79a58d1f | 997 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
998 | to the same server. We may make this configurable later or |
999 | use ses->maxReq */ | |
1000 | ||
fb2036d8 | 1001 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1002 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1003 | len); |
6d9c6d54 VL |
1004 | return -EIO; |
1005 | } | |
1006 | ||
a891f0f8 | 1007 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1008 | if (rc) |
1009 | return rc; | |
1010 | ||
79a58d1f | 1011 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1012 | and avoid races inside tcp sendmsg code that could cause corruption |
1013 | of smb data */ | |
1014 | ||
72ca545b | 1015 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1016 | |
1017 | rc = allocate_mid(ses, in_buf, &midQ); | |
1018 | if (rc) { | |
72ca545b | 1019 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1020 | return rc; |
1021 | } | |
1022 | ||
7ee1af76 | 1023 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1024 | if (rc) { |
3c1bf7e4 | 1025 | cifs_delete_mid(midQ); |
829049cb VL |
1026 | mutex_unlock(&ses->server->srv_mutex); |
1027 | return rc; | |
1028 | } | |
1da177e4 | 1029 | |
7c9421e1 | 1030 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1031 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1032 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1033 | cifs_in_send_dec(ses->server); |
1034 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1035 | |
1036 | if (rc < 0) | |
1037 | ses->server->sequence_number -= 2; | |
1038 | ||
72ca545b | 1039 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1040 | |
79a58d1f | 1041 | if (rc < 0) { |
3c1bf7e4 | 1042 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1043 | return rc; |
1044 | } | |
1045 | ||
1046 | /* Wait for a reply - allow signals to interrupt. */ | |
1047 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1048 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1049 | ((ses->server->tcpStatus != CifsGood) && |
1050 | (ses->server->tcpStatus != CifsNew))); | |
1051 | ||
1052 | /* Were we interrupted by a signal ? */ | |
1053 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1054 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1055 | ((ses->server->tcpStatus == CifsGood) || |
1056 | (ses->server->tcpStatus == CifsNew))) { | |
1057 | ||
1058 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1059 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1060 | blocking lock to return. */ | |
fb2036d8 | 1061 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1062 | if (rc) { |
3c1bf7e4 | 1063 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1064 | return rc; |
1065 | } | |
1066 | } else { | |
1067 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1068 | to cause the blocking lock to return. */ | |
1069 | ||
1070 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1071 | ||
1072 | /* If we get -ENOLCK back the lock may have | |
1073 | already been removed. Don't exit in this case. */ | |
1074 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1075 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1076 | return rc; |
1077 | } | |
1078 | } | |
1079 | ||
1be912dd JL |
1080 | rc = wait_for_response(ses->server, midQ); |
1081 | if (rc) { | |
fb2036d8 | 1082 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1083 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1084 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1085 | /* no longer considered to be "in-flight" */ |
1086 | midQ->callback = DeleteMidQEntry; | |
1087 | spin_unlock(&GlobalMid_Lock); | |
1088 | return rc; | |
1089 | } | |
1090 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1091 | } |
1be912dd JL |
1092 | |
1093 | /* We got the response - restart system call. */ | |
1094 | rstart = 1; | |
7ee1af76 JA |
1095 | } |
1096 | ||
3c1105df | 1097 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1098 | if (rc != 0) |
7ee1af76 | 1099 | return rc; |
50c2f753 | 1100 | |
17c8bfed | 1101 | /* rcvd frame is ok */ |
7c9421e1 | 1102 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1103 | rc = -EIO; |
f96637be | 1104 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1105 | goto out; |
1106 | } | |
1da177e4 | 1107 | |
d4e4854f | 1108 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1109 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1110 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1111 | out: |
3c1bf7e4 | 1112 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1113 | if (rstart && rc == -EACCES) |
1114 | return -ERESTARTSYS; | |
1da177e4 LT |
1115 | return rc; |
1116 | } |