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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 | ||
93d2cb6c LL |
539 | /* |
540 | * Need to store the time in mid before calling I/O. For call_async, | |
541 | * I/O response may come back and free the mid entry on another thread. | |
542 | */ | |
543 | cifs_save_when_sent(mid); | |
789e6661 | 544 | cifs_in_send_inc(server); |
7fb8986e | 545 | rc = smb_send_rqst(server, rqst, flags); |
789e6661 | 546 | cifs_in_send_dec(server); |
ad313cb8 | 547 | |
820962dc | 548 | if (rc < 0) { |
ad313cb8 | 549 | server->sequence_number -= 2; |
820962dc RV |
550 | cifs_delete_mid(mid); |
551 | } | |
552 | ||
a6827c18 | 553 | mutex_unlock(&server->srv_mutex); |
789e6661 | 554 | |
ffc61ccb SP |
555 | if (rc == 0) |
556 | return 0; | |
a6827c18 | 557 | |
cb7e9eab | 558 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
559 | return rc; |
560 | } | |
561 | ||
133672ef SF |
562 | /* |
563 | * | |
564 | * Send an SMB Request. No response info (other than return code) | |
565 | * needs to be parsed. | |
566 | * | |
567 | * flags indicate the type of request buffer and how long to wait | |
568 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
569 | * | |
570 | */ | |
571 | int | |
96daf2b0 | 572 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 573 | char *in_buf, int flags) |
133672ef SF |
574 | { |
575 | int rc; | |
576 | struct kvec iov[1]; | |
da502f7d | 577 | struct kvec rsp_iov; |
133672ef SF |
578 | int resp_buf_type; |
579 | ||
792af7b0 PS |
580 | iov[0].iov_base = in_buf; |
581 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 582 | flags |= CIFS_NO_RESP; |
da502f7d | 583 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 584 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 585 | |
133672ef SF |
586 | return rc; |
587 | } | |
588 | ||
053d5034 | 589 | static int |
3c1105df | 590 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
591 | { |
592 | int rc = 0; | |
593 | ||
f96637be JP |
594 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
595 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 596 | |
74dd92a8 | 597 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 598 | switch (mid->mid_state) { |
74dd92a8 | 599 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
600 | spin_unlock(&GlobalMid_Lock); |
601 | return rc; | |
74dd92a8 JL |
602 | case MID_RETRY_NEEDED: |
603 | rc = -EAGAIN; | |
604 | break; | |
71823baf JL |
605 | case MID_RESPONSE_MALFORMED: |
606 | rc = -EIO; | |
607 | break; | |
3c1105df JL |
608 | case MID_SHUTDOWN: |
609 | rc = -EHOSTDOWN; | |
610 | break; | |
74dd92a8 | 611 | default: |
3c1105df | 612 | list_del_init(&mid->qhead); |
f96637be JP |
613 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
614 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 615 | rc = -EIO; |
053d5034 JL |
616 | } |
617 | spin_unlock(&GlobalMid_Lock); | |
618 | ||
2b84a36c | 619 | DeleteMidQEntry(mid); |
053d5034 JL |
620 | return rc; |
621 | } | |
622 | ||
121b046a | 623 | static inline int |
fb2036d8 PS |
624 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
625 | struct mid_q_entry *mid) | |
76dcc26f | 626 | { |
121b046a | 627 | return server->ops->send_cancel ? |
fb2036d8 | 628 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
629 | } |
630 | ||
2c8f981d JL |
631 | int |
632 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
633 | bool log_error) | |
634 | { | |
792af7b0 | 635 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
636 | |
637 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
638 | |
639 | /* convert the length into a more usable form */ | |
38d77c50 | 640 | if (server->sign) { |
738f9de5 | 641 | struct kvec iov[2]; |
985e4ff0 | 642 | int rc = 0; |
738f9de5 PS |
643 | struct smb_rqst rqst = { .rq_iov = iov, |
644 | .rq_nvec = 2 }; | |
826a95e4 | 645 | |
738f9de5 PS |
646 | iov[0].iov_base = mid->resp_buf; |
647 | iov[0].iov_len = 4; | |
648 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
649 | iov[1].iov_len = len - 4; | |
2c8f981d | 650 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 651 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 652 | mid->sequence_number); |
985e4ff0 | 653 | if (rc) |
f96637be JP |
654 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
655 | rc); | |
2c8f981d JL |
656 | } |
657 | ||
658 | /* BB special case reconnect tid and uid here? */ | |
659 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
660 | } | |
661 | ||
fec344e3 JL |
662 | struct mid_q_entry * |
663 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
664 | { |
665 | int rc; | |
fec344e3 | 666 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
667 | struct mid_q_entry *mid; |
668 | ||
738f9de5 PS |
669 | if (rqst->rq_iov[0].iov_len != 4 || |
670 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
671 | return ERR_PTR(-EIO); | |
672 | ||
792af7b0 PS |
673 | rc = allocate_mid(ses, hdr, &mid); |
674 | if (rc) | |
fec344e3 JL |
675 | return ERR_PTR(rc); |
676 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
677 | if (rc) { | |
3c1bf7e4 | 678 | cifs_delete_mid(mid); |
fec344e3 JL |
679 | return ERR_PTR(rc); |
680 | } | |
681 | return mid; | |
792af7b0 PS |
682 | } |
683 | ||
b8f57ee8 | 684 | int |
738f9de5 PS |
685 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
686 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
687 | struct kvec *resp_iov) | |
7ee1af76 JA |
688 | { |
689 | int rc = 0; | |
a891f0f8 | 690 | int timeout, optype; |
7ee1af76 | 691 | struct mid_q_entry *midQ; |
a891f0f8 | 692 | unsigned int credits = 1; |
738f9de5 | 693 | char *buf; |
50c2f753 | 694 | |
a891f0f8 PS |
695 | timeout = flags & CIFS_TIMEOUT_MASK; |
696 | optype = flags & CIFS_OP_MASK; | |
133672ef | 697 | |
a891f0f8 | 698 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
699 | |
700 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 701 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
702 | return -EIO; |
703 | } | |
704 | ||
da502f7d | 705 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 706 | return -ENOENT; |
7ee1af76 | 707 | |
792af7b0 PS |
708 | /* |
709 | * Ensure that we do not send more than 50 overlapping requests | |
710 | * to the same server. We may make this configurable later or | |
711 | * use ses->maxReq. | |
712 | */ | |
7ee1af76 | 713 | |
a891f0f8 | 714 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 715 | if (rc) |
7ee1af76 | 716 | return rc; |
7ee1af76 | 717 | |
792af7b0 PS |
718 | /* |
719 | * Make sure that we sign in the same order that we send on this socket | |
720 | * and avoid races inside tcp sendmsg code that could cause corruption | |
721 | * of smb data. | |
722 | */ | |
7ee1af76 | 723 | |
72ca545b | 724 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 725 | |
738f9de5 | 726 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 727 | if (IS_ERR(midQ)) { |
72ca545b | 728 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 729 | /* Update # of requests on wire to server */ |
a891f0f8 | 730 | add_credits(ses->server, 1, optype); |
fec344e3 | 731 | return PTR_ERR(midQ); |
1da177e4 | 732 | } |
1da177e4 | 733 | |
7c9421e1 | 734 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 735 | cifs_in_send_inc(ses->server); |
7fb8986e | 736 | rc = smb_send_rqst(ses->server, rqst, flags); |
789e6661 SF |
737 | cifs_in_send_dec(ses->server); |
738 | cifs_save_when_sent(midQ); | |
7ee1af76 | 739 | |
ad313cb8 JL |
740 | if (rc < 0) |
741 | ses->server->sequence_number -= 2; | |
72ca545b | 742 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 743 | |
da502f7d | 744 | if (rc < 0) |
7ee1af76 | 745 | goto out; |
4b8f930f | 746 | |
da502f7d | 747 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 748 | goto out; |
d6e04ae6 | 749 | |
0ade640e | 750 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 751 | if (rc != 0) { |
38bd4906 | 752 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid); |
738f9de5 | 753 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 754 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 755 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
38bd4906 | 756 | midQ->mid_flags |= MID_WAIT_CANCELLED; |
1be912dd JL |
757 | midQ->callback = DeleteMidQEntry; |
758 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 759 | add_credits(ses->server, 1, optype); |
1be912dd JL |
760 | return rc; |
761 | } | |
762 | spin_unlock(&GlobalMid_Lock); | |
763 | } | |
d6e04ae6 | 764 | |
3c1105df | 765 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 766 | if (rc != 0) { |
a891f0f8 | 767 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
768 | return rc; |
769 | } | |
50c2f753 | 770 | |
7c9421e1 | 771 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 772 | rc = -EIO; |
f96637be | 773 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
774 | goto out; |
775 | } | |
776 | ||
792af7b0 | 777 | buf = (char *)midQ->resp_buf; |
da502f7d PS |
778 | resp_iov->iov_base = buf; |
779 | resp_iov->iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 780 | if (midQ->large_buf) |
a891f0f8 | 781 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 782 | else |
a891f0f8 PS |
783 | *resp_buf_type = CIFS_SMALL_BUFFER; |
784 | ||
785 | credits = ses->server->ops->get_credits(midQ); | |
2b2bdfba | 786 | |
082d0642 PS |
787 | rc = ses->server->ops->check_receive(midQ, ses->server, |
788 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 789 | |
3c1bf7e4 | 790 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
791 | if ((flags & CIFS_NO_RESP) == 0) |
792 | midQ->resp_buf = NULL; | |
7ee1af76 | 793 | out: |
3c1bf7e4 | 794 | cifs_delete_mid(midQ); |
a891f0f8 | 795 | add_credits(ses->server, credits, optype); |
1da177e4 | 796 | |
d6e04ae6 SF |
797 | return rc; |
798 | } | |
1da177e4 | 799 | |
738f9de5 PS |
800 | int |
801 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
802 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
803 | const int flags, struct kvec *resp_iov) | |
804 | { | |
805 | struct smb_rqst rqst; | |
806 | struct kvec *new_iov; | |
807 | int rc; | |
808 | ||
809 | new_iov = kmalloc(sizeof(struct kvec) * (n_vec + 1), GFP_KERNEL); | |
810 | if (!new_iov) | |
811 | return -ENOMEM; | |
812 | ||
813 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
814 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
815 | ||
816 | new_iov[0].iov_base = new_iov[1].iov_base; | |
817 | new_iov[0].iov_len = 4; | |
818 | new_iov[1].iov_base += 4; | |
819 | new_iov[1].iov_len -= 4; | |
820 | ||
821 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
822 | rqst.rq_iov = new_iov; | |
823 | rqst.rq_nvec = n_vec + 1; | |
824 | ||
825 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
826 | kfree(new_iov); | |
827 | return rc; | |
828 | } | |
829 | ||
1da177e4 | 830 | int |
96daf2b0 | 831 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 832 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 833 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
834 | { |
835 | int rc = 0; | |
1da177e4 | 836 | struct mid_q_entry *midQ; |
fb2036d8 PS |
837 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
838 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
839 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
840 | |
841 | if (ses == NULL) { | |
f96637be | 842 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
843 | return -EIO; |
844 | } | |
79a58d1f | 845 | if (ses->server == NULL) { |
f96637be | 846 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
847 | return -EIO; |
848 | } | |
849 | ||
79a58d1f | 850 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
851 | return -ENOENT; |
852 | ||
79a58d1f | 853 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
854 | to the same server. We may make this configurable later or |
855 | use ses->maxReq */ | |
1da177e4 | 856 | |
fb2036d8 | 857 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 858 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 859 | len); |
6d9c6d54 VL |
860 | return -EIO; |
861 | } | |
862 | ||
a891f0f8 | 863 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
864 | if (rc) |
865 | return rc; | |
866 | ||
79a58d1f | 867 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
868 | and avoid races inside tcp sendmsg code that could cause corruption |
869 | of smb data */ | |
870 | ||
72ca545b | 871 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 872 | |
7ee1af76 JA |
873 | rc = allocate_mid(ses, in_buf, &midQ); |
874 | if (rc) { | |
72ca545b | 875 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 876 | /* Update # of requests on wire to server */ |
a891f0f8 | 877 | add_credits(ses->server, 1, 0); |
7ee1af76 | 878 | return rc; |
1da177e4 LT |
879 | } |
880 | ||
ad009ac9 | 881 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
882 | if (rc) { |
883 | mutex_unlock(&ses->server->srv_mutex); | |
884 | goto out; | |
885 | } | |
1da177e4 | 886 | |
7c9421e1 | 887 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
888 | |
889 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 890 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
891 | cifs_in_send_dec(ses->server); |
892 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
893 | |
894 | if (rc < 0) | |
895 | ses->server->sequence_number -= 2; | |
896 | ||
72ca545b | 897 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 898 | |
79a58d1f | 899 | if (rc < 0) |
7ee1af76 JA |
900 | goto out; |
901 | ||
a891f0f8 | 902 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 903 | goto out; |
1da177e4 | 904 | |
0ade640e | 905 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 906 | if (rc != 0) { |
fb2036d8 | 907 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 908 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 909 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
910 | /* no longer considered to be "in-flight" */ |
911 | midQ->callback = DeleteMidQEntry; | |
912 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 913 | add_credits(ses->server, 1, 0); |
1be912dd JL |
914 | return rc; |
915 | } | |
916 | spin_unlock(&GlobalMid_Lock); | |
917 | } | |
1da177e4 | 918 | |
3c1105df | 919 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 920 | if (rc != 0) { |
a891f0f8 | 921 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
922 | return rc; |
923 | } | |
50c2f753 | 924 | |
2c8f981d | 925 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 926 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 927 | rc = -EIO; |
f96637be | 928 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 929 | goto out; |
1da177e4 | 930 | } |
7ee1af76 | 931 | |
d4e4854f | 932 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
933 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
934 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 935 | out: |
3c1bf7e4 | 936 | cifs_delete_mid(midQ); |
a891f0f8 | 937 | add_credits(ses->server, 1, 0); |
1da177e4 | 938 | |
7ee1af76 JA |
939 | return rc; |
940 | } | |
1da177e4 | 941 | |
7ee1af76 JA |
942 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
943 | blocking lock to return. */ | |
944 | ||
945 | static int | |
96daf2b0 | 946 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
947 | struct smb_hdr *in_buf, |
948 | struct smb_hdr *out_buf) | |
949 | { | |
950 | int bytes_returned; | |
96daf2b0 | 951 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
952 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
953 | ||
954 | /* We just modify the current in_buf to change | |
955 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
956 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
957 | LOCKING_ANDX_CANCEL_LOCK. */ | |
958 | ||
959 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
960 | pSMB->Timeout = 0; | |
88257360 | 961 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
962 | |
963 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 964 | &bytes_returned, 0); |
7ee1af76 JA |
965 | } |
966 | ||
967 | int | |
96daf2b0 | 968 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
969 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
970 | int *pbytes_returned) | |
971 | { | |
972 | int rc = 0; | |
973 | int rstart = 0; | |
7ee1af76 | 974 | struct mid_q_entry *midQ; |
96daf2b0 | 975 | struct cifs_ses *ses; |
fb2036d8 PS |
976 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
977 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
978 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
979 | |
980 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 981 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
982 | return -EIO; |
983 | } | |
984 | ses = tcon->ses; | |
985 | ||
79a58d1f | 986 | if (ses->server == NULL) { |
f96637be | 987 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
988 | return -EIO; |
989 | } | |
990 | ||
79a58d1f | 991 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
992 | return -ENOENT; |
993 | ||
79a58d1f | 994 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
995 | to the same server. We may make this configurable later or |
996 | use ses->maxReq */ | |
997 | ||
fb2036d8 | 998 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 999 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1000 | len); |
6d9c6d54 VL |
1001 | return -EIO; |
1002 | } | |
1003 | ||
a891f0f8 | 1004 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1005 | if (rc) |
1006 | return rc; | |
1007 | ||
79a58d1f | 1008 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1009 | and avoid races inside tcp sendmsg code that could cause corruption |
1010 | of smb data */ | |
1011 | ||
72ca545b | 1012 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1013 | |
1014 | rc = allocate_mid(ses, in_buf, &midQ); | |
1015 | if (rc) { | |
72ca545b | 1016 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1017 | return rc; |
1018 | } | |
1019 | ||
7ee1af76 | 1020 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1021 | if (rc) { |
3c1bf7e4 | 1022 | cifs_delete_mid(midQ); |
829049cb VL |
1023 | mutex_unlock(&ses->server->srv_mutex); |
1024 | return rc; | |
1025 | } | |
1da177e4 | 1026 | |
7c9421e1 | 1027 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1028 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1029 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1030 | cifs_in_send_dec(ses->server); |
1031 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1032 | |
1033 | if (rc < 0) | |
1034 | ses->server->sequence_number -= 2; | |
1035 | ||
72ca545b | 1036 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1037 | |
79a58d1f | 1038 | if (rc < 0) { |
3c1bf7e4 | 1039 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1040 | return rc; |
1041 | } | |
1042 | ||
1043 | /* Wait for a reply - allow signals to interrupt. */ | |
1044 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1045 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1046 | ((ses->server->tcpStatus != CifsGood) && |
1047 | (ses->server->tcpStatus != CifsNew))); | |
1048 | ||
1049 | /* Were we interrupted by a signal ? */ | |
1050 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1051 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1052 | ((ses->server->tcpStatus == CifsGood) || |
1053 | (ses->server->tcpStatus == CifsNew))) { | |
1054 | ||
1055 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1056 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1057 | blocking lock to return. */ | |
fb2036d8 | 1058 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1059 | if (rc) { |
3c1bf7e4 | 1060 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1061 | return rc; |
1062 | } | |
1063 | } else { | |
1064 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1065 | to cause the blocking lock to return. */ | |
1066 | ||
1067 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1068 | ||
1069 | /* If we get -ENOLCK back the lock may have | |
1070 | already been removed. Don't exit in this case. */ | |
1071 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1072 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1073 | return rc; |
1074 | } | |
1075 | } | |
1076 | ||
1be912dd JL |
1077 | rc = wait_for_response(ses->server, midQ); |
1078 | if (rc) { | |
fb2036d8 | 1079 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1080 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1081 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1082 | /* no longer considered to be "in-flight" */ |
1083 | midQ->callback = DeleteMidQEntry; | |
1084 | spin_unlock(&GlobalMid_Lock); | |
1085 | return rc; | |
1086 | } | |
1087 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1088 | } |
1be912dd JL |
1089 | |
1090 | /* We got the response - restart system call. */ | |
1091 | rstart = 1; | |
7ee1af76 JA |
1092 | } |
1093 | ||
3c1105df | 1094 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1095 | if (rc != 0) |
7ee1af76 | 1096 | return rc; |
50c2f753 | 1097 | |
17c8bfed | 1098 | /* rcvd frame is ok */ |
7c9421e1 | 1099 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1100 | rc = -EIO; |
f96637be | 1101 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1102 | goto out; |
1103 | } | |
1da177e4 | 1104 | |
d4e4854f | 1105 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1106 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1107 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1108 | out: |
3c1bf7e4 | 1109 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1110 | if (rstart && rc == -EACCES) |
1111 | return -ERESTARTSYS; | |
1da177e4 LT |
1112 | return rc; |
1113 | } |