Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
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" | |
8bd68c6e | 40 | #include "smb2proto.h" |
9762c2d0 | 41 | #include "smbdirect.h" |
50c2f753 | 42 | |
3cecf486 RS |
43 | /* Max number of iovectors we can use off the stack when sending requests. */ |
44 | #define CIFS_MAX_IOV_SIZE 8 | |
45 | ||
2dc7e1c0 PS |
46 | void |
47 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
48 | { |
49 | wake_up_process(mid->callback_data); | |
50 | } | |
51 | ||
a6827c18 | 52 | struct mid_q_entry * |
24b9b06b | 53 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
54 | { |
55 | struct mid_q_entry *temp; | |
56 | ||
24b9b06b | 57 | if (server == NULL) { |
f96637be | 58 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
1da177e4 LT |
59 | return NULL; |
60 | } | |
50c2f753 | 61 | |
232087cb | 62 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
a6f74e80 N |
63 | memset(temp, 0, sizeof(struct mid_q_entry)); |
64 | temp->mid = get_mid(smb_buffer); | |
65 | temp->pid = current->pid; | |
66 | temp->command = cpu_to_le16(smb_buffer->Command); | |
67 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 68 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
69 | /* when mid allocated can be before when sent */ |
70 | temp->when_alloc = jiffies; | |
71 | temp->server = server; | |
2b84a36c | 72 | |
a6f74e80 N |
73 | /* |
74 | * The default is for the mid to be synchronous, so the | |
75 | * default callback just wakes up the current task. | |
76 | */ | |
77 | temp->callback = cifs_wake_up_task; | |
78 | temp->callback_data = current; | |
1da177e4 | 79 | |
1da177e4 | 80 | atomic_inc(&midCount); |
7c9421e1 | 81 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
82 | return temp; |
83 | } | |
84 | ||
766fdbb5 | 85 | void |
1da177e4 LT |
86 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
87 | { | |
1047abc1 | 88 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 89 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
90 | unsigned long now; |
91 | #endif | |
7c9421e1 | 92 | midEntry->mid_state = MID_FREE; |
8097531a | 93 | atomic_dec(&midCount); |
7c9421e1 | 94 | if (midEntry->large_buf) |
b8643e1b SF |
95 | cifs_buf_release(midEntry->resp_buf); |
96 | else | |
97 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
98 | #ifdef CONFIG_CIFS_STATS2 |
99 | now = jiffies; | |
100 | /* commands taking longer than one second are indications that | |
101 | something is wrong, unless it is quite a slow link or server */ | |
4328fea7 | 102 | if (time_after(now, midEntry->when_alloc + HZ)) { |
2dc7e1c0 | 103 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
0b456f04 | 104 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 105 | midEntry->command, midEntry->mid); |
0b456f04 | 106 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
107 | now - midEntry->when_alloc, |
108 | now - midEntry->when_sent, | |
109 | now - midEntry->when_received); | |
110 | } | |
111 | } | |
112 | #endif | |
1da177e4 LT |
113 | mempool_free(midEntry, cifs_mid_poolp); |
114 | } | |
115 | ||
3c1bf7e4 PS |
116 | void |
117 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
118 | { |
119 | spin_lock(&GlobalMid_Lock); | |
120 | list_del(&mid->qhead); | |
121 | spin_unlock(&GlobalMid_Lock); | |
122 | ||
123 | DeleteMidQEntry(mid); | |
124 | } | |
125 | ||
6f49f46b JL |
126 | /* |
127 | * smb_send_kvec - send an array of kvecs to the server | |
128 | * @server: Server to send the data to | |
3ab3f2a1 | 129 | * @smb_msg: Message to send |
6f49f46b JL |
130 | * @sent: amount of data sent on socket is stored here |
131 | * | |
132 | * Our basic "send data to server" function. Should be called with srv_mutex | |
133 | * held. The caller is responsible for handling the results. | |
134 | */ | |
d6e04ae6 | 135 | static int |
3ab3f2a1 AV |
136 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
137 | size_t *sent) | |
1da177e4 LT |
138 | { |
139 | int rc = 0; | |
3ab3f2a1 | 140 | int retries = 0; |
edf1ae40 | 141 | struct socket *ssocket = server->ssocket; |
50c2f753 | 142 | |
6f49f46b JL |
143 | *sent = 0; |
144 | ||
3ab3f2a1 AV |
145 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
146 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
147 | smb_msg->msg_control = NULL; | |
148 | smb_msg->msg_controllen = 0; | |
0496e02d | 149 | if (server->noblocksnd) |
3ab3f2a1 | 150 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 151 | else |
3ab3f2a1 | 152 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 153 | |
3ab3f2a1 | 154 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
155 | /* |
156 | * If blocking send, we try 3 times, since each can block | |
157 | * for 5 seconds. For nonblocking we have to try more | |
158 | * but wait increasing amounts of time allowing time for | |
159 | * socket to clear. The overall time we wait in either | |
160 | * case to send on the socket is about 15 seconds. | |
161 | * Similarly we wait for 15 seconds for a response from | |
162 | * the server in SendReceive[2] for the server to send | |
163 | * a response back for most types of requests (except | |
164 | * SMB Write past end of file which can be slow, and | |
165 | * blocking lock operations). NFS waits slightly longer | |
166 | * than CIFS, but this can make it take longer for | |
167 | * nonresponsive servers to be detected and 15 seconds | |
168 | * is more than enough time for modern networks to | |
169 | * send a packet. In most cases if we fail to send | |
170 | * after the retries we will kill the socket and | |
171 | * reconnect which may clear the network problem. | |
172 | */ | |
3ab3f2a1 | 173 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 174 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
175 | retries++; |
176 | if (retries >= 14 || | |
177 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
178 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
179 | ssocket); | |
3ab3f2a1 | 180 | return -EAGAIN; |
1da177e4 | 181 | } |
3ab3f2a1 | 182 | msleep(1 << retries); |
1da177e4 LT |
183 | continue; |
184 | } | |
6f49f46b | 185 | |
79a58d1f | 186 | if (rc < 0) |
3ab3f2a1 | 187 | return rc; |
6f49f46b | 188 | |
79a58d1f | 189 | if (rc == 0) { |
3e84469d SF |
190 | /* should never happen, letting socket clear before |
191 | retrying is our only obvious option here */ | |
f96637be | 192 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
193 | msleep(500); |
194 | continue; | |
d6e04ae6 | 195 | } |
6f49f46b | 196 | |
3ab3f2a1 AV |
197 | /* send was at least partially successful */ |
198 | *sent += rc; | |
199 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 200 | } |
3ab3f2a1 | 201 | return 0; |
97bc00b3 JL |
202 | } |
203 | ||
a26054d1 JL |
204 | static unsigned long |
205 | rqst_len(struct smb_rqst *rqst) | |
206 | { | |
207 | unsigned int i; | |
208 | struct kvec *iov = rqst->rq_iov; | |
209 | unsigned long buflen = 0; | |
210 | ||
211 | /* total up iov array first */ | |
212 | for (i = 0; i < rqst->rq_nvec; i++) | |
213 | buflen += iov[i].iov_len; | |
214 | ||
c06a0f2d LL |
215 | /* |
216 | * Add in the page array if there is one. The caller needs to make | |
217 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
218 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
219 | * PAGE_SIZE. | |
220 | */ | |
a26054d1 | 221 | if (rqst->rq_npages) { |
c06a0f2d LL |
222 | if (rqst->rq_npages == 1) |
223 | buflen += rqst->rq_tailsz; | |
224 | else { | |
225 | /* | |
226 | * If there is more than one page, calculate the | |
227 | * buffer length based on rq_offset and rq_tailsz | |
228 | */ | |
229 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
230 | rqst->rq_offset; | |
231 | buflen += rqst->rq_tailsz; | |
232 | } | |
a26054d1 JL |
233 | } |
234 | ||
235 | return buflen; | |
236 | } | |
237 | ||
6f49f46b | 238 | static int |
7fb8986e | 239 | __smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
6f49f46b JL |
240 | { |
241 | int rc; | |
242 | struct kvec *iov = rqst->rq_iov; | |
243 | int n_vec = rqst->rq_nvec; | |
c713c877 | 244 | unsigned int send_length; |
97bc00b3 | 245 | unsigned int i; |
3ab3f2a1 | 246 | size_t total_len = 0, sent, size; |
b8eed283 | 247 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 248 | struct msghdr smb_msg; |
b8eed283 | 249 | int val = 1; |
c713c877 RS |
250 | __be32 rfc1002_marker; |
251 | ||
9762c2d0 LL |
252 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
253 | rc = smbd_send(server->smbd_conn, rqst); | |
254 | goto smbd_done; | |
255 | } | |
ea702b80 JL |
256 | if (ssocket == NULL) |
257 | return -ENOTSOCK; | |
258 | ||
a26054d1 | 259 | send_length = rqst_len(rqst); |
c713c877 | 260 | rfc1002_marker = cpu_to_be32(send_length); |
6f49f46b | 261 | |
b8eed283 JL |
262 | /* cork the socket */ |
263 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
264 | (char *)&val, sizeof(val)); | |
265 | ||
3ab3f2a1 | 266 | size = 0; |
c713c877 RS |
267 | /* Generate a rfc1002 marker for SMB2+ */ |
268 | if (server->vals->header_preamble_size == 0) { | |
269 | struct kvec hiov = { | |
270 | .iov_base = &rfc1002_marker, | |
271 | .iov_len = 4 | |
272 | }; | |
273 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov, | |
274 | 1, 4); | |
275 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
276 | if (rc < 0) | |
277 | goto uncork; | |
278 | ||
279 | total_len += sent; | |
280 | send_length += 4; | |
281 | } | |
282 | ||
283 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); | |
284 | dump_smb(iov[0].iov_base, iov[0].iov_len); | |
285 | dump_smb(iov[1].iov_base, iov[1].iov_len); | |
286 | ||
3ab3f2a1 AV |
287 | for (i = 0; i < n_vec; i++) |
288 | size += iov[i].iov_len; | |
289 | ||
290 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size); | |
291 | ||
292 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
97bc00b3 JL |
293 | if (rc < 0) |
294 | goto uncork; | |
295 | ||
296 | total_len += sent; | |
297 | ||
298 | /* now walk the page array and send each page in it */ | |
299 | for (i = 0; i < rqst->rq_npages; i++) { | |
e8157b27 LL |
300 | struct bio_vec bvec; |
301 | ||
302 | bvec.bv_page = rqst->rq_pages[i]; | |
303 | rqst_page_get_length(rqst, i, &bvec.bv_len, &bvec.bv_offset); | |
304 | ||
3ab3f2a1 | 305 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, |
e8157b27 | 306 | &bvec, 1, bvec.bv_len); |
3ab3f2a1 | 307 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 JL |
308 | if (rc < 0) |
309 | break; | |
310 | ||
311 | total_len += sent; | |
312 | } | |
1da177e4 | 313 | |
97bc00b3 | 314 | uncork: |
b8eed283 JL |
315 | /* uncork it */ |
316 | val = 0; | |
317 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
318 | (char *)&val, sizeof(val)); | |
319 | ||
c713c877 | 320 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 321 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 322 | send_length, total_len); |
6f49f46b JL |
323 | /* |
324 | * If we have only sent part of an SMB then the next SMB could | |
325 | * be taken as the remainder of this one. We need to kill the | |
326 | * socket so the server throws away the partial SMB | |
327 | */ | |
edf1ae40 SF |
328 | server->tcpStatus = CifsNeedReconnect; |
329 | } | |
9762c2d0 | 330 | smbd_done: |
d804d41d | 331 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
332 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
333 | rc); | |
d804d41d | 334 | else |
1da177e4 | 335 | rc = 0; |
1da177e4 LT |
336 | |
337 | return rc; | |
338 | } | |
339 | ||
6f49f46b | 340 | static int |
7fb8986e | 341 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst, int flags) |
6f49f46b | 342 | { |
7fb8986e PS |
343 | struct smb_rqst cur_rqst; |
344 | int rc; | |
345 | ||
346 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
347 | return __smb_send_rqst(server, rqst); | |
348 | ||
349 | if (!server->ops->init_transform_rq || | |
350 | !server->ops->free_transform_rq) { | |
351 | cifs_dbg(VFS, "Encryption requested but transform callbacks are missed\n"); | |
352 | return -EIO; | |
353 | } | |
6f49f46b | 354 | |
7fb8986e PS |
355 | rc = server->ops->init_transform_rq(server, &cur_rqst, rqst); |
356 | if (rc) | |
357 | return rc; | |
358 | ||
359 | rc = __smb_send_rqst(server, &cur_rqst); | |
360 | server->ops->free_transform_rq(&cur_rqst); | |
361 | return rc; | |
6f49f46b JL |
362 | } |
363 | ||
0496e02d JL |
364 | int |
365 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
366 | unsigned int smb_buf_length) | |
367 | { | |
738f9de5 | 368 | struct kvec iov[2]; |
7fb8986e PS |
369 | struct smb_rqst rqst = { .rq_iov = iov, |
370 | .rq_nvec = 2 }; | |
0496e02d | 371 | |
738f9de5 PS |
372 | iov[0].iov_base = smb_buffer; |
373 | iov[0].iov_len = 4; | |
374 | iov[1].iov_base = (char *)smb_buffer + 4; | |
375 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 376 | |
7fb8986e | 377 | return __smb_send_rqst(server, &rqst); |
0496e02d JL |
378 | } |
379 | ||
fc40f9cf | 380 | static int |
a891f0f8 | 381 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 382 | int *credits) |
1da177e4 | 383 | { |
5bc59498 PS |
384 | int rc; |
385 | ||
fc40f9cf | 386 | spin_lock(&server->req_lock); |
a891f0f8 | 387 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 388 | /* oplock breaks must not be held up */ |
fc40f9cf | 389 | server->in_flight++; |
bc205ed1 | 390 | *credits -= 1; |
fc40f9cf | 391 | spin_unlock(&server->req_lock); |
27a97a61 VL |
392 | return 0; |
393 | } | |
394 | ||
27a97a61 | 395 | while (1) { |
bc205ed1 | 396 | if (*credits <= 0) { |
fc40f9cf | 397 | spin_unlock(&server->req_lock); |
789e6661 | 398 | cifs_num_waiters_inc(server); |
5bc59498 | 399 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 400 | has_credits(server, credits)); |
789e6661 | 401 | cifs_num_waiters_dec(server); |
5bc59498 PS |
402 | if (rc) |
403 | return rc; | |
fc40f9cf | 404 | spin_lock(&server->req_lock); |
27a97a61 | 405 | } else { |
c5797a94 | 406 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 407 | spin_unlock(&server->req_lock); |
27a97a61 | 408 | return -ENOENT; |
1da177e4 | 409 | } |
27a97a61 | 410 | |
2d86dbc9 PS |
411 | /* |
412 | * Can not count locking commands against total | |
413 | * as they are allowed to block on server. | |
414 | */ | |
27a97a61 VL |
415 | |
416 | /* update # of requests on the wire to server */ | |
a891f0f8 | 417 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 418 | *credits -= 1; |
fc40f9cf | 419 | server->in_flight++; |
2d86dbc9 | 420 | } |
fc40f9cf | 421 | spin_unlock(&server->req_lock); |
27a97a61 | 422 | break; |
1da177e4 LT |
423 | } |
424 | } | |
7ee1af76 JA |
425 | return 0; |
426 | } | |
1da177e4 | 427 | |
bc205ed1 | 428 | static int |
a891f0f8 PS |
429 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
430 | const int optype) | |
bc205ed1 | 431 | { |
eb4c7df6 SP |
432 | int *val; |
433 | ||
434 | val = server->ops->get_credits_field(server, optype); | |
435 | /* Since an echo is already inflight, no need to wait to send another */ | |
436 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
437 | return -EAGAIN; | |
438 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
439 | } |
440 | ||
cb7e9eab PS |
441 | int |
442 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
443 | unsigned int *num, unsigned int *credits) | |
444 | { | |
445 | *num = size; | |
446 | *credits = 0; | |
447 | return 0; | |
448 | } | |
449 | ||
96daf2b0 | 450 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
451 | struct mid_q_entry **ppmidQ) |
452 | { | |
1da177e4 | 453 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 454 | return -ENOENT; |
8fbbd365 VL |
455 | } |
456 | ||
457 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 458 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 459 | return -EAGAIN; |
8fbbd365 VL |
460 | } |
461 | ||
7f48558e | 462 | if (ses->status == CifsNew) { |
79a58d1f | 463 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 464 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 465 | return -EAGAIN; |
ad7a2926 | 466 | /* else ok - we are setting up session */ |
1da177e4 | 467 | } |
7f48558e SP |
468 | |
469 | if (ses->status == CifsExiting) { | |
470 | /* check if SMB session is bad because we are setting it up */ | |
471 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
472 | return -EAGAIN; | |
473 | /* else ok - we are shutting down session */ | |
474 | } | |
475 | ||
24b9b06b | 476 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 477 | if (*ppmidQ == NULL) |
7ee1af76 | 478 | return -ENOMEM; |
ddc8cf8f JL |
479 | spin_lock(&GlobalMid_Lock); |
480 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
481 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
482 | return 0; |
483 | } | |
484 | ||
0ade640e JL |
485 | static int |
486 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 487 | { |
0ade640e | 488 | int error; |
7ee1af76 | 489 | |
5853cc2a | 490 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 491 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
492 | if (error < 0) |
493 | return -ERESTARTSYS; | |
7ee1af76 | 494 | |
0ade640e | 495 | return 0; |
7ee1af76 JA |
496 | } |
497 | ||
fec344e3 JL |
498 | struct mid_q_entry * |
499 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
500 | { |
501 | int rc; | |
fec344e3 | 502 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
503 | struct mid_q_entry *mid; |
504 | ||
738f9de5 PS |
505 | if (rqst->rq_iov[0].iov_len != 4 || |
506 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
507 | return ERR_PTR(-EIO); | |
508 | ||
792af7b0 | 509 | /* enable signing if server requires it */ |
38d77c50 | 510 | if (server->sign) |
792af7b0 PS |
511 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
512 | ||
513 | mid = AllocMidQEntry(hdr, server); | |
514 | if (mid == NULL) | |
fec344e3 | 515 | return ERR_PTR(-ENOMEM); |
792af7b0 | 516 | |
fec344e3 | 517 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
518 | if (rc) { |
519 | DeleteMidQEntry(mid); | |
fec344e3 | 520 | return ERR_PTR(rc); |
ffc61ccb SP |
521 | } |
522 | ||
fec344e3 | 523 | return mid; |
792af7b0 | 524 | } |
133672ef | 525 | |
a6827c18 JL |
526 | /* |
527 | * Send a SMB request and set the callback function in the mid to handle | |
528 | * the result. Caller is responsible for dealing with timeouts. | |
529 | */ | |
530 | int | |
fec344e3 | 531 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
532 | mid_receive_t *receive, mid_callback_t *callback, |
533 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 534 | { |
a891f0f8 | 535 | int rc, timeout, optype; |
a6827c18 | 536 | struct mid_q_entry *mid; |
cb7e9eab | 537 | unsigned int credits = 0; |
a6827c18 | 538 | |
a891f0f8 PS |
539 | timeout = flags & CIFS_TIMEOUT_MASK; |
540 | optype = flags & CIFS_OP_MASK; | |
541 | ||
cb7e9eab PS |
542 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
543 | rc = wait_for_free_request(server, timeout, optype); | |
544 | if (rc) | |
545 | return rc; | |
546 | credits = 1; | |
547 | } | |
a6827c18 JL |
548 | |
549 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
550 | mid = server->ops->setup_async_request(server, rqst); |
551 | if (IS_ERR(mid)) { | |
a6827c18 | 552 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 553 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 554 | return PTR_ERR(mid); |
a6827c18 JL |
555 | } |
556 | ||
44d22d84 | 557 | mid->receive = receive; |
a6827c18 JL |
558 | mid->callback = callback; |
559 | mid->callback_data = cbdata; | |
9b7c18a2 | 560 | mid->handle = handle; |
7c9421e1 | 561 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 562 | |
ffc61ccb SP |
563 | /* put it on the pending_mid_q */ |
564 | spin_lock(&GlobalMid_Lock); | |
565 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
566 | spin_unlock(&GlobalMid_Lock); | |
567 | ||
93d2cb6c LL |
568 | /* |
569 | * Need to store the time in mid before calling I/O. For call_async, | |
570 | * I/O response may come back and free the mid entry on another thread. | |
571 | */ | |
572 | cifs_save_when_sent(mid); | |
789e6661 | 573 | cifs_in_send_inc(server); |
7fb8986e | 574 | rc = smb_send_rqst(server, rqst, flags); |
789e6661 | 575 | cifs_in_send_dec(server); |
ad313cb8 | 576 | |
820962dc | 577 | if (rc < 0) { |
ad313cb8 | 578 | server->sequence_number -= 2; |
820962dc RV |
579 | cifs_delete_mid(mid); |
580 | } | |
581 | ||
a6827c18 | 582 | mutex_unlock(&server->srv_mutex); |
789e6661 | 583 | |
ffc61ccb SP |
584 | if (rc == 0) |
585 | return 0; | |
a6827c18 | 586 | |
cb7e9eab | 587 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
588 | return rc; |
589 | } | |
590 | ||
133672ef SF |
591 | /* |
592 | * | |
593 | * Send an SMB Request. No response info (other than return code) | |
594 | * needs to be parsed. | |
595 | * | |
596 | * flags indicate the type of request buffer and how long to wait | |
597 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
598 | * | |
599 | */ | |
600 | int | |
96daf2b0 | 601 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 602 | char *in_buf, int flags) |
133672ef SF |
603 | { |
604 | int rc; | |
605 | struct kvec iov[1]; | |
da502f7d | 606 | struct kvec rsp_iov; |
133672ef SF |
607 | int resp_buf_type; |
608 | ||
792af7b0 PS |
609 | iov[0].iov_base = in_buf; |
610 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 611 | flags |= CIFS_NO_RESP; |
da502f7d | 612 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 613 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 614 | |
133672ef SF |
615 | return rc; |
616 | } | |
617 | ||
053d5034 | 618 | static int |
3c1105df | 619 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
620 | { |
621 | int rc = 0; | |
622 | ||
f96637be JP |
623 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
624 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 625 | |
74dd92a8 | 626 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 627 | switch (mid->mid_state) { |
74dd92a8 | 628 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
629 | spin_unlock(&GlobalMid_Lock); |
630 | return rc; | |
74dd92a8 JL |
631 | case MID_RETRY_NEEDED: |
632 | rc = -EAGAIN; | |
633 | break; | |
71823baf JL |
634 | case MID_RESPONSE_MALFORMED: |
635 | rc = -EIO; | |
636 | break; | |
3c1105df JL |
637 | case MID_SHUTDOWN: |
638 | rc = -EHOSTDOWN; | |
639 | break; | |
74dd92a8 | 640 | default: |
3c1105df | 641 | list_del_init(&mid->qhead); |
f96637be JP |
642 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
643 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 644 | rc = -EIO; |
053d5034 JL |
645 | } |
646 | spin_unlock(&GlobalMid_Lock); | |
647 | ||
2b84a36c | 648 | DeleteMidQEntry(mid); |
053d5034 JL |
649 | return rc; |
650 | } | |
651 | ||
121b046a | 652 | static inline int |
fb2036d8 PS |
653 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
654 | struct mid_q_entry *mid) | |
76dcc26f | 655 | { |
121b046a | 656 | return server->ops->send_cancel ? |
fb2036d8 | 657 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
658 | } |
659 | ||
2c8f981d JL |
660 | int |
661 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
662 | bool log_error) | |
663 | { | |
792af7b0 | 664 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
665 | |
666 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
667 | |
668 | /* convert the length into a more usable form */ | |
38d77c50 | 669 | if (server->sign) { |
738f9de5 | 670 | struct kvec iov[2]; |
985e4ff0 | 671 | int rc = 0; |
738f9de5 PS |
672 | struct smb_rqst rqst = { .rq_iov = iov, |
673 | .rq_nvec = 2 }; | |
826a95e4 | 674 | |
738f9de5 PS |
675 | iov[0].iov_base = mid->resp_buf; |
676 | iov[0].iov_len = 4; | |
677 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
678 | iov[1].iov_len = len - 4; | |
2c8f981d | 679 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 680 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 681 | mid->sequence_number); |
985e4ff0 | 682 | if (rc) |
f96637be JP |
683 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
684 | rc); | |
2c8f981d JL |
685 | } |
686 | ||
687 | /* BB special case reconnect tid and uid here? */ | |
688 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
689 | } | |
690 | ||
fec344e3 JL |
691 | struct mid_q_entry * |
692 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
693 | { |
694 | int rc; | |
fec344e3 | 695 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
696 | struct mid_q_entry *mid; |
697 | ||
738f9de5 PS |
698 | if (rqst->rq_iov[0].iov_len != 4 || |
699 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
700 | return ERR_PTR(-EIO); | |
701 | ||
792af7b0 PS |
702 | rc = allocate_mid(ses, hdr, &mid); |
703 | if (rc) | |
fec344e3 JL |
704 | return ERR_PTR(rc); |
705 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
706 | if (rc) { | |
3c1bf7e4 | 707 | cifs_delete_mid(mid); |
fec344e3 JL |
708 | return ERR_PTR(rc); |
709 | } | |
710 | return mid; | |
792af7b0 PS |
711 | } |
712 | ||
b8f57ee8 | 713 | int |
738f9de5 PS |
714 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
715 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
716 | struct kvec *resp_iov) | |
7ee1af76 JA |
717 | { |
718 | int rc = 0; | |
a891f0f8 | 719 | int timeout, optype; |
7ee1af76 | 720 | struct mid_q_entry *midQ; |
a891f0f8 | 721 | unsigned int credits = 1; |
738f9de5 | 722 | char *buf; |
50c2f753 | 723 | |
a891f0f8 PS |
724 | timeout = flags & CIFS_TIMEOUT_MASK; |
725 | optype = flags & CIFS_OP_MASK; | |
133672ef | 726 | |
a891f0f8 | 727 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
728 | |
729 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 730 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
731 | return -EIO; |
732 | } | |
733 | ||
da502f7d | 734 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 735 | return -ENOENT; |
7ee1af76 | 736 | |
792af7b0 PS |
737 | /* |
738 | * Ensure that we do not send more than 50 overlapping requests | |
739 | * to the same server. We may make this configurable later or | |
740 | * use ses->maxReq. | |
741 | */ | |
a891f0f8 | 742 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 743 | if (rc) |
7ee1af76 | 744 | return rc; |
7ee1af76 | 745 | |
792af7b0 PS |
746 | /* |
747 | * Make sure that we sign in the same order that we send on this socket | |
748 | * and avoid races inside tcp sendmsg code that could cause corruption | |
749 | * of smb data. | |
750 | */ | |
7ee1af76 | 751 | |
72ca545b | 752 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 753 | |
738f9de5 | 754 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 755 | if (IS_ERR(midQ)) { |
72ca545b | 756 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 757 | /* Update # of requests on wire to server */ |
a891f0f8 | 758 | add_credits(ses->server, 1, optype); |
fec344e3 | 759 | return PTR_ERR(midQ); |
1da177e4 | 760 | } |
1da177e4 | 761 | |
7c9421e1 | 762 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 763 | cifs_in_send_inc(ses->server); |
7fb8986e | 764 | rc = smb_send_rqst(ses->server, rqst, flags); |
789e6661 SF |
765 | cifs_in_send_dec(ses->server); |
766 | cifs_save_when_sent(midQ); | |
7ee1af76 | 767 | |
ad313cb8 JL |
768 | if (rc < 0) |
769 | ses->server->sequence_number -= 2; | |
72ca545b | 770 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 771 | |
da502f7d | 772 | if (rc < 0) |
7ee1af76 | 773 | goto out; |
4b8f930f | 774 | |
8bd68c6e | 775 | #ifdef CONFIG_CIFS_SMB311 |
0d5ec281 | 776 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) |
c713c877 RS |
777 | smb311_update_preauth_hash(ses, rqst->rq_iov, |
778 | rqst->rq_nvec); | |
8bd68c6e AA |
779 | #endif |
780 | ||
da502f7d | 781 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 782 | goto out; |
d6e04ae6 | 783 | |
0ade640e | 784 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 785 | if (rc != 0) { |
38bd4906 | 786 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid); |
738f9de5 | 787 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 788 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 789 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
38bd4906 | 790 | midQ->mid_flags |= MID_WAIT_CANCELLED; |
1be912dd JL |
791 | midQ->callback = DeleteMidQEntry; |
792 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 793 | add_credits(ses->server, 1, optype); |
1be912dd JL |
794 | return rc; |
795 | } | |
796 | spin_unlock(&GlobalMid_Lock); | |
797 | } | |
d6e04ae6 | 798 | |
3c1105df | 799 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 800 | if (rc != 0) { |
a891f0f8 | 801 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
802 | return rc; |
803 | } | |
50c2f753 | 804 | |
7c9421e1 | 805 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 806 | rc = -EIO; |
f96637be | 807 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
808 | goto out; |
809 | } | |
810 | ||
792af7b0 | 811 | buf = (char *)midQ->resp_buf; |
da502f7d | 812 | resp_iov->iov_base = buf; |
e19b2bc0 | 813 | resp_iov->iov_len = midQ->resp_buf_size + |
93012bf9 | 814 | ses->server->vals->header_preamble_size; |
7c9421e1 | 815 | if (midQ->large_buf) |
a891f0f8 | 816 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 817 | else |
a891f0f8 PS |
818 | *resp_buf_type = CIFS_SMALL_BUFFER; |
819 | ||
8bd68c6e | 820 | #ifdef CONFIG_CIFS_SMB311 |
0d5ec281 | 821 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { |
8bd68c6e | 822 | struct kvec iov = { |
c713c877 RS |
823 | .iov_base = resp_iov->iov_base, |
824 | .iov_len = resp_iov->iov_len | |
8bd68c6e AA |
825 | }; |
826 | smb311_update_preauth_hash(ses, &iov, 1); | |
827 | } | |
828 | #endif | |
829 | ||
a891f0f8 | 830 | credits = ses->server->ops->get_credits(midQ); |
2b2bdfba | 831 | |
082d0642 PS |
832 | rc = ses->server->ops->check_receive(midQ, ses->server, |
833 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 834 | |
3c1bf7e4 | 835 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
836 | if ((flags & CIFS_NO_RESP) == 0) |
837 | midQ->resp_buf = NULL; | |
7ee1af76 | 838 | out: |
3c1bf7e4 | 839 | cifs_delete_mid(midQ); |
a891f0f8 | 840 | add_credits(ses->server, credits, optype); |
1da177e4 | 841 | |
d6e04ae6 SF |
842 | return rc; |
843 | } | |
1da177e4 | 844 | |
738f9de5 PS |
845 | int |
846 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
847 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
848 | const int flags, struct kvec *resp_iov) | |
849 | { | |
850 | struct smb_rqst rqst; | |
3cecf486 | 851 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
852 | int rc; |
853 | ||
3cecf486 | 854 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
855 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
856 | GFP_KERNEL); | |
117e3b7f SF |
857 | if (!new_iov) { |
858 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
859 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 860 | return -ENOMEM; |
117e3b7f | 861 | } |
3cecf486 RS |
862 | } else |
863 | new_iov = s_iov; | |
738f9de5 PS |
864 | |
865 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
866 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
867 | ||
868 | new_iov[0].iov_base = new_iov[1].iov_base; | |
869 | new_iov[0].iov_len = 4; | |
870 | new_iov[1].iov_base += 4; | |
871 | new_iov[1].iov_len -= 4; | |
872 | ||
873 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
874 | rqst.rq_iov = new_iov; | |
875 | rqst.rq_nvec = n_vec + 1; | |
876 | ||
877 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
878 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
879 | kfree(new_iov); | |
738f9de5 PS |
880 | return rc; |
881 | } | |
882 | ||
83b77391 RS |
883 | /* Like SendReceive2 but iov[0] does not contain an rfc1002 header */ |
884 | int | |
885 | smb2_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
886 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
887 | const int flags, struct kvec *resp_iov) | |
888 | { | |
889 | struct smb_rqst rqst; | |
83b77391 | 890 | int rc; |
83b77391 RS |
891 | |
892 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
c713c877 RS |
893 | rqst.rq_iov = iov; |
894 | rqst.rq_nvec = n_vec; | |
83b77391 RS |
895 | |
896 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
83b77391 RS |
897 | return rc; |
898 | } | |
899 | ||
1da177e4 | 900 | int |
96daf2b0 | 901 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 902 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 903 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
904 | { |
905 | int rc = 0; | |
1da177e4 | 906 | struct mid_q_entry *midQ; |
fb2036d8 PS |
907 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
908 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
909 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
910 | |
911 | if (ses == NULL) { | |
f96637be | 912 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
913 | return -EIO; |
914 | } | |
79a58d1f | 915 | if (ses->server == NULL) { |
f96637be | 916 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
917 | return -EIO; |
918 | } | |
919 | ||
79a58d1f | 920 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
921 | return -ENOENT; |
922 | ||
79a58d1f | 923 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
924 | to the same server. We may make this configurable later or |
925 | use ses->maxReq */ | |
1da177e4 | 926 | |
fb2036d8 | 927 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 928 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 929 | len); |
6d9c6d54 VL |
930 | return -EIO; |
931 | } | |
932 | ||
a891f0f8 | 933 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
934 | if (rc) |
935 | return rc; | |
936 | ||
79a58d1f | 937 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
938 | and avoid races inside tcp sendmsg code that could cause corruption |
939 | of smb data */ | |
940 | ||
72ca545b | 941 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 942 | |
7ee1af76 JA |
943 | rc = allocate_mid(ses, in_buf, &midQ); |
944 | if (rc) { | |
72ca545b | 945 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 946 | /* Update # of requests on wire to server */ |
a891f0f8 | 947 | add_credits(ses->server, 1, 0); |
7ee1af76 | 948 | return rc; |
1da177e4 LT |
949 | } |
950 | ||
ad009ac9 | 951 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
952 | if (rc) { |
953 | mutex_unlock(&ses->server->srv_mutex); | |
954 | goto out; | |
955 | } | |
1da177e4 | 956 | |
7c9421e1 | 957 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
958 | |
959 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 960 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
961 | cifs_in_send_dec(ses->server); |
962 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
963 | |
964 | if (rc < 0) | |
965 | ses->server->sequence_number -= 2; | |
966 | ||
72ca545b | 967 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 968 | |
79a58d1f | 969 | if (rc < 0) |
7ee1af76 JA |
970 | goto out; |
971 | ||
a891f0f8 | 972 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 973 | goto out; |
1da177e4 | 974 | |
0ade640e | 975 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 976 | if (rc != 0) { |
fb2036d8 | 977 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 978 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 979 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
980 | /* no longer considered to be "in-flight" */ |
981 | midQ->callback = DeleteMidQEntry; | |
982 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 983 | add_credits(ses->server, 1, 0); |
1be912dd JL |
984 | return rc; |
985 | } | |
986 | spin_unlock(&GlobalMid_Lock); | |
987 | } | |
1da177e4 | 988 | |
3c1105df | 989 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 990 | if (rc != 0) { |
a891f0f8 | 991 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
992 | return rc; |
993 | } | |
50c2f753 | 994 | |
2c8f981d | 995 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 996 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 997 | rc = -EIO; |
f96637be | 998 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 999 | goto out; |
1da177e4 | 1000 | } |
7ee1af76 | 1001 | |
d4e4854f | 1002 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1003 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1004 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1005 | out: |
3c1bf7e4 | 1006 | cifs_delete_mid(midQ); |
a891f0f8 | 1007 | add_credits(ses->server, 1, 0); |
1da177e4 | 1008 | |
7ee1af76 JA |
1009 | return rc; |
1010 | } | |
1da177e4 | 1011 | |
7ee1af76 JA |
1012 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1013 | blocking lock to return. */ | |
1014 | ||
1015 | static int | |
96daf2b0 | 1016 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1017 | struct smb_hdr *in_buf, |
1018 | struct smb_hdr *out_buf) | |
1019 | { | |
1020 | int bytes_returned; | |
96daf2b0 | 1021 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1022 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1023 | ||
1024 | /* We just modify the current in_buf to change | |
1025 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1026 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1027 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1028 | ||
1029 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1030 | pSMB->Timeout = 0; | |
88257360 | 1031 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1032 | |
1033 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1034 | &bytes_returned, 0); |
7ee1af76 JA |
1035 | } |
1036 | ||
1037 | int | |
96daf2b0 | 1038 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1039 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1040 | int *pbytes_returned) | |
1041 | { | |
1042 | int rc = 0; | |
1043 | int rstart = 0; | |
7ee1af76 | 1044 | struct mid_q_entry *midQ; |
96daf2b0 | 1045 | struct cifs_ses *ses; |
fb2036d8 PS |
1046 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1047 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1048 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1049 | |
1050 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1051 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1052 | return -EIO; |
1053 | } | |
1054 | ses = tcon->ses; | |
1055 | ||
79a58d1f | 1056 | if (ses->server == NULL) { |
f96637be | 1057 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1058 | return -EIO; |
1059 | } | |
1060 | ||
79a58d1f | 1061 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1062 | return -ENOENT; |
1063 | ||
79a58d1f | 1064 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1065 | to the same server. We may make this configurable later or |
1066 | use ses->maxReq */ | |
1067 | ||
fb2036d8 | 1068 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1069 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1070 | len); |
6d9c6d54 VL |
1071 | return -EIO; |
1072 | } | |
1073 | ||
a891f0f8 | 1074 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1075 | if (rc) |
1076 | return rc; | |
1077 | ||
79a58d1f | 1078 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1079 | and avoid races inside tcp sendmsg code that could cause corruption |
1080 | of smb data */ | |
1081 | ||
72ca545b | 1082 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1083 | |
1084 | rc = allocate_mid(ses, in_buf, &midQ); | |
1085 | if (rc) { | |
72ca545b | 1086 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1087 | return rc; |
1088 | } | |
1089 | ||
7ee1af76 | 1090 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1091 | if (rc) { |
3c1bf7e4 | 1092 | cifs_delete_mid(midQ); |
829049cb VL |
1093 | mutex_unlock(&ses->server->srv_mutex); |
1094 | return rc; | |
1095 | } | |
1da177e4 | 1096 | |
7c9421e1 | 1097 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1098 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1099 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1100 | cifs_in_send_dec(ses->server); |
1101 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1102 | |
1103 | if (rc < 0) | |
1104 | ses->server->sequence_number -= 2; | |
1105 | ||
72ca545b | 1106 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1107 | |
79a58d1f | 1108 | if (rc < 0) { |
3c1bf7e4 | 1109 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1110 | return rc; |
1111 | } | |
1112 | ||
1113 | /* Wait for a reply - allow signals to interrupt. */ | |
1114 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1115 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1116 | ((ses->server->tcpStatus != CifsGood) && |
1117 | (ses->server->tcpStatus != CifsNew))); | |
1118 | ||
1119 | /* Were we interrupted by a signal ? */ | |
1120 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1121 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1122 | ((ses->server->tcpStatus == CifsGood) || |
1123 | (ses->server->tcpStatus == CifsNew))) { | |
1124 | ||
1125 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1126 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1127 | blocking lock to return. */ | |
fb2036d8 | 1128 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1129 | if (rc) { |
3c1bf7e4 | 1130 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1131 | return rc; |
1132 | } | |
1133 | } else { | |
1134 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1135 | to cause the blocking lock to return. */ | |
1136 | ||
1137 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1138 | ||
1139 | /* If we get -ENOLCK back the lock may have | |
1140 | already been removed. Don't exit in this case. */ | |
1141 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1142 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1143 | return rc; |
1144 | } | |
1145 | } | |
1146 | ||
1be912dd JL |
1147 | rc = wait_for_response(ses->server, midQ); |
1148 | if (rc) { | |
fb2036d8 | 1149 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1150 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1151 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1152 | /* no longer considered to be "in-flight" */ |
1153 | midQ->callback = DeleteMidQEntry; | |
1154 | spin_unlock(&GlobalMid_Lock); | |
1155 | return rc; | |
1156 | } | |
1157 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1158 | } |
1be912dd JL |
1159 | |
1160 | /* We got the response - restart system call. */ | |
1161 | rstart = 1; | |
7ee1af76 JA |
1162 | } |
1163 | ||
3c1105df | 1164 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1165 | if (rc != 0) |
7ee1af76 | 1166 | return rc; |
50c2f753 | 1167 | |
17c8bfed | 1168 | /* rcvd frame is ok */ |
7c9421e1 | 1169 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1170 | rc = -EIO; |
f96637be | 1171 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1172 | goto out; |
1173 | } | |
1da177e4 | 1174 | |
d4e4854f | 1175 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1176 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1177 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1178 | out: |
3c1bf7e4 | 1179 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1180 | if (rstart && rc == -EACCES) |
1181 | return -ERESTARTSYS; | |
1da177e4 LT |
1182 | return rc; |
1183 | } |