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; | |
244 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); | |
a26054d1 | 245 | unsigned long send_length; |
97bc00b3 | 246 | unsigned int i; |
3ab3f2a1 | 247 | size_t total_len = 0, sent, size; |
b8eed283 | 248 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 249 | struct msghdr smb_msg; |
b8eed283 | 250 | int val = 1; |
9762c2d0 LL |
251 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
252 | rc = smbd_send(server->smbd_conn, rqst); | |
253 | goto smbd_done; | |
254 | } | |
ea702b80 JL |
255 | if (ssocket == NULL) |
256 | return -ENOTSOCK; | |
257 | ||
a26054d1 JL |
258 | /* sanity check send length */ |
259 | send_length = rqst_len(rqst); | |
260 | if (send_length != smb_buf_length + 4) { | |
261 | WARN(1, "Send length mismatch(send_length=%lu smb_buf_length=%u)\n", | |
262 | send_length, smb_buf_length); | |
263 | return -EIO; | |
264 | } | |
265 | ||
738f9de5 PS |
266 | if (n_vec < 2) |
267 | return -EIO; | |
268 | ||
f96637be | 269 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", smb_buf_length); |
6f49f46b | 270 | dump_smb(iov[0].iov_base, iov[0].iov_len); |
738f9de5 | 271 | dump_smb(iov[1].iov_base, iov[1].iov_len); |
6f49f46b | 272 | |
b8eed283 JL |
273 | /* cork the socket */ |
274 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
275 | (char *)&val, sizeof(val)); | |
276 | ||
3ab3f2a1 AV |
277 | size = 0; |
278 | for (i = 0; i < n_vec; i++) | |
279 | size += iov[i].iov_len; | |
280 | ||
281 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, iov, n_vec, size); | |
282 | ||
283 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
97bc00b3 JL |
284 | if (rc < 0) |
285 | goto uncork; | |
286 | ||
287 | total_len += sent; | |
288 | ||
289 | /* now walk the page array and send each page in it */ | |
290 | for (i = 0; i < rqst->rq_npages; i++) { | |
e8157b27 LL |
291 | struct bio_vec bvec; |
292 | ||
293 | bvec.bv_page = rqst->rq_pages[i]; | |
294 | rqst_page_get_length(rqst, i, &bvec.bv_len, &bvec.bv_offset); | |
295 | ||
3ab3f2a1 | 296 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, |
e8157b27 | 297 | &bvec, 1, bvec.bv_len); |
3ab3f2a1 | 298 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 JL |
299 | if (rc < 0) |
300 | break; | |
301 | ||
302 | total_len += sent; | |
303 | } | |
1da177e4 | 304 | |
97bc00b3 | 305 | uncork: |
b8eed283 JL |
306 | /* uncork it */ |
307 | val = 0; | |
308 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
309 | (char *)&val, sizeof(val)); | |
310 | ||
edf1ae40 | 311 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
f96637be JP |
312 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
313 | smb_buf_length + 4, total_len); | |
6f49f46b JL |
314 | /* |
315 | * If we have only sent part of an SMB then the next SMB could | |
316 | * be taken as the remainder of this one. We need to kill the | |
317 | * socket so the server throws away the partial SMB | |
318 | */ | |
edf1ae40 SF |
319 | server->tcpStatus = CifsNeedReconnect; |
320 | } | |
9762c2d0 | 321 | smbd_done: |
d804d41d | 322 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
323 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
324 | rc); | |
d804d41d | 325 | else |
1da177e4 | 326 | rc = 0; |
1da177e4 LT |
327 | |
328 | return rc; | |
329 | } | |
330 | ||
6f49f46b | 331 | static int |
7fb8986e | 332 | smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst, int flags) |
6f49f46b | 333 | { |
7fb8986e PS |
334 | struct smb_rqst cur_rqst; |
335 | int rc; | |
336 | ||
337 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
338 | return __smb_send_rqst(server, rqst); | |
339 | ||
340 | if (!server->ops->init_transform_rq || | |
341 | !server->ops->free_transform_rq) { | |
342 | cifs_dbg(VFS, "Encryption requested but transform callbacks are missed\n"); | |
343 | return -EIO; | |
344 | } | |
6f49f46b | 345 | |
7fb8986e PS |
346 | rc = server->ops->init_transform_rq(server, &cur_rqst, rqst); |
347 | if (rc) | |
348 | return rc; | |
349 | ||
350 | rc = __smb_send_rqst(server, &cur_rqst); | |
351 | server->ops->free_transform_rq(&cur_rqst); | |
352 | return rc; | |
6f49f46b JL |
353 | } |
354 | ||
0496e02d JL |
355 | int |
356 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
357 | unsigned int smb_buf_length) | |
358 | { | |
738f9de5 | 359 | struct kvec iov[2]; |
7fb8986e PS |
360 | struct smb_rqst rqst = { .rq_iov = iov, |
361 | .rq_nvec = 2 }; | |
0496e02d | 362 | |
738f9de5 PS |
363 | iov[0].iov_base = smb_buffer; |
364 | iov[0].iov_len = 4; | |
365 | iov[1].iov_base = (char *)smb_buffer + 4; | |
366 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 367 | |
7fb8986e | 368 | return __smb_send_rqst(server, &rqst); |
0496e02d JL |
369 | } |
370 | ||
fc40f9cf | 371 | static int |
a891f0f8 | 372 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 373 | int *credits) |
1da177e4 | 374 | { |
5bc59498 PS |
375 | int rc; |
376 | ||
fc40f9cf | 377 | spin_lock(&server->req_lock); |
a891f0f8 | 378 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 379 | /* oplock breaks must not be held up */ |
fc40f9cf | 380 | server->in_flight++; |
bc205ed1 | 381 | *credits -= 1; |
fc40f9cf | 382 | spin_unlock(&server->req_lock); |
27a97a61 VL |
383 | return 0; |
384 | } | |
385 | ||
27a97a61 | 386 | while (1) { |
bc205ed1 | 387 | if (*credits <= 0) { |
fc40f9cf | 388 | spin_unlock(&server->req_lock); |
789e6661 | 389 | cifs_num_waiters_inc(server); |
5bc59498 | 390 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 391 | has_credits(server, credits)); |
789e6661 | 392 | cifs_num_waiters_dec(server); |
5bc59498 PS |
393 | if (rc) |
394 | return rc; | |
fc40f9cf | 395 | spin_lock(&server->req_lock); |
27a97a61 | 396 | } else { |
c5797a94 | 397 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 398 | spin_unlock(&server->req_lock); |
27a97a61 | 399 | return -ENOENT; |
1da177e4 | 400 | } |
27a97a61 | 401 | |
2d86dbc9 PS |
402 | /* |
403 | * Can not count locking commands against total | |
404 | * as they are allowed to block on server. | |
405 | */ | |
27a97a61 VL |
406 | |
407 | /* update # of requests on the wire to server */ | |
a891f0f8 | 408 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 409 | *credits -= 1; |
fc40f9cf | 410 | server->in_flight++; |
2d86dbc9 | 411 | } |
fc40f9cf | 412 | spin_unlock(&server->req_lock); |
27a97a61 | 413 | break; |
1da177e4 LT |
414 | } |
415 | } | |
7ee1af76 JA |
416 | return 0; |
417 | } | |
1da177e4 | 418 | |
bc205ed1 | 419 | static int |
a891f0f8 PS |
420 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
421 | const int optype) | |
bc205ed1 | 422 | { |
eb4c7df6 SP |
423 | int *val; |
424 | ||
425 | val = server->ops->get_credits_field(server, optype); | |
426 | /* Since an echo is already inflight, no need to wait to send another */ | |
427 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
428 | return -EAGAIN; | |
429 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
430 | } |
431 | ||
cb7e9eab PS |
432 | int |
433 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
434 | unsigned int *num, unsigned int *credits) | |
435 | { | |
436 | *num = size; | |
437 | *credits = 0; | |
438 | return 0; | |
439 | } | |
440 | ||
96daf2b0 | 441 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
442 | struct mid_q_entry **ppmidQ) |
443 | { | |
1da177e4 | 444 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 445 | return -ENOENT; |
8fbbd365 VL |
446 | } |
447 | ||
448 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 449 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 450 | return -EAGAIN; |
8fbbd365 VL |
451 | } |
452 | ||
7f48558e | 453 | if (ses->status == CifsNew) { |
79a58d1f | 454 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 455 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 456 | return -EAGAIN; |
ad7a2926 | 457 | /* else ok - we are setting up session */ |
1da177e4 | 458 | } |
7f48558e SP |
459 | |
460 | if (ses->status == CifsExiting) { | |
461 | /* check if SMB session is bad because we are setting it up */ | |
462 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
463 | return -EAGAIN; | |
464 | /* else ok - we are shutting down session */ | |
465 | } | |
466 | ||
24b9b06b | 467 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 468 | if (*ppmidQ == NULL) |
7ee1af76 | 469 | return -ENOMEM; |
ddc8cf8f JL |
470 | spin_lock(&GlobalMid_Lock); |
471 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
472 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
473 | return 0; |
474 | } | |
475 | ||
0ade640e JL |
476 | static int |
477 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 478 | { |
0ade640e | 479 | int error; |
7ee1af76 | 480 | |
5853cc2a | 481 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 482 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
483 | if (error < 0) |
484 | return -ERESTARTSYS; | |
7ee1af76 | 485 | |
0ade640e | 486 | return 0; |
7ee1af76 JA |
487 | } |
488 | ||
fec344e3 JL |
489 | struct mid_q_entry * |
490 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
491 | { |
492 | int rc; | |
fec344e3 | 493 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
494 | struct mid_q_entry *mid; |
495 | ||
738f9de5 PS |
496 | if (rqst->rq_iov[0].iov_len != 4 || |
497 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
498 | return ERR_PTR(-EIO); | |
499 | ||
792af7b0 | 500 | /* enable signing if server requires it */ |
38d77c50 | 501 | if (server->sign) |
792af7b0 PS |
502 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
503 | ||
504 | mid = AllocMidQEntry(hdr, server); | |
505 | if (mid == NULL) | |
fec344e3 | 506 | return ERR_PTR(-ENOMEM); |
792af7b0 | 507 | |
fec344e3 | 508 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
509 | if (rc) { |
510 | DeleteMidQEntry(mid); | |
fec344e3 | 511 | return ERR_PTR(rc); |
ffc61ccb SP |
512 | } |
513 | ||
fec344e3 | 514 | return mid; |
792af7b0 | 515 | } |
133672ef | 516 | |
a6827c18 JL |
517 | /* |
518 | * Send a SMB request and set the callback function in the mid to handle | |
519 | * the result. Caller is responsible for dealing with timeouts. | |
520 | */ | |
521 | int | |
fec344e3 | 522 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
523 | mid_receive_t *receive, mid_callback_t *callback, |
524 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 525 | { |
a891f0f8 | 526 | int rc, timeout, optype; |
a6827c18 | 527 | struct mid_q_entry *mid; |
cb7e9eab | 528 | unsigned int credits = 0; |
a6827c18 | 529 | |
a891f0f8 PS |
530 | timeout = flags & CIFS_TIMEOUT_MASK; |
531 | optype = flags & CIFS_OP_MASK; | |
532 | ||
cb7e9eab PS |
533 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
534 | rc = wait_for_free_request(server, timeout, optype); | |
535 | if (rc) | |
536 | return rc; | |
537 | credits = 1; | |
538 | } | |
a6827c18 JL |
539 | |
540 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
541 | mid = server->ops->setup_async_request(server, rqst); |
542 | if (IS_ERR(mid)) { | |
a6827c18 | 543 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 544 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 545 | return PTR_ERR(mid); |
a6827c18 JL |
546 | } |
547 | ||
44d22d84 | 548 | mid->receive = receive; |
a6827c18 JL |
549 | mid->callback = callback; |
550 | mid->callback_data = cbdata; | |
9b7c18a2 | 551 | mid->handle = handle; |
7c9421e1 | 552 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 553 | |
ffc61ccb SP |
554 | /* put it on the pending_mid_q */ |
555 | spin_lock(&GlobalMid_Lock); | |
556 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
557 | spin_unlock(&GlobalMid_Lock); | |
558 | ||
93d2cb6c LL |
559 | /* |
560 | * Need to store the time in mid before calling I/O. For call_async, | |
561 | * I/O response may come back and free the mid entry on another thread. | |
562 | */ | |
563 | cifs_save_when_sent(mid); | |
789e6661 | 564 | cifs_in_send_inc(server); |
7fb8986e | 565 | rc = smb_send_rqst(server, rqst, flags); |
789e6661 | 566 | cifs_in_send_dec(server); |
ad313cb8 | 567 | |
820962dc | 568 | if (rc < 0) { |
ad313cb8 | 569 | server->sequence_number -= 2; |
820962dc RV |
570 | cifs_delete_mid(mid); |
571 | } | |
572 | ||
a6827c18 | 573 | mutex_unlock(&server->srv_mutex); |
789e6661 | 574 | |
ffc61ccb SP |
575 | if (rc == 0) |
576 | return 0; | |
a6827c18 | 577 | |
cb7e9eab | 578 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
579 | return rc; |
580 | } | |
581 | ||
133672ef SF |
582 | /* |
583 | * | |
584 | * Send an SMB Request. No response info (other than return code) | |
585 | * needs to be parsed. | |
586 | * | |
587 | * flags indicate the type of request buffer and how long to wait | |
588 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
589 | * | |
590 | */ | |
591 | int | |
96daf2b0 | 592 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 593 | char *in_buf, int flags) |
133672ef SF |
594 | { |
595 | int rc; | |
596 | struct kvec iov[1]; | |
da502f7d | 597 | struct kvec rsp_iov; |
133672ef SF |
598 | int resp_buf_type; |
599 | ||
792af7b0 PS |
600 | iov[0].iov_base = in_buf; |
601 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 602 | flags |= CIFS_NO_RESP; |
da502f7d | 603 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 604 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 605 | |
133672ef SF |
606 | return rc; |
607 | } | |
608 | ||
053d5034 | 609 | static int |
3c1105df | 610 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
611 | { |
612 | int rc = 0; | |
613 | ||
f96637be JP |
614 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
615 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 616 | |
74dd92a8 | 617 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 618 | switch (mid->mid_state) { |
74dd92a8 | 619 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
620 | spin_unlock(&GlobalMid_Lock); |
621 | return rc; | |
74dd92a8 JL |
622 | case MID_RETRY_NEEDED: |
623 | rc = -EAGAIN; | |
624 | break; | |
71823baf JL |
625 | case MID_RESPONSE_MALFORMED: |
626 | rc = -EIO; | |
627 | break; | |
3c1105df JL |
628 | case MID_SHUTDOWN: |
629 | rc = -EHOSTDOWN; | |
630 | break; | |
74dd92a8 | 631 | default: |
3c1105df | 632 | list_del_init(&mid->qhead); |
f96637be JP |
633 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
634 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 635 | rc = -EIO; |
053d5034 JL |
636 | } |
637 | spin_unlock(&GlobalMid_Lock); | |
638 | ||
2b84a36c | 639 | DeleteMidQEntry(mid); |
053d5034 JL |
640 | return rc; |
641 | } | |
642 | ||
121b046a | 643 | static inline int |
fb2036d8 PS |
644 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
645 | struct mid_q_entry *mid) | |
76dcc26f | 646 | { |
121b046a | 647 | return server->ops->send_cancel ? |
fb2036d8 | 648 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
649 | } |
650 | ||
2c8f981d JL |
651 | int |
652 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
653 | bool log_error) | |
654 | { | |
792af7b0 | 655 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
656 | |
657 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
658 | |
659 | /* convert the length into a more usable form */ | |
38d77c50 | 660 | if (server->sign) { |
738f9de5 | 661 | struct kvec iov[2]; |
985e4ff0 | 662 | int rc = 0; |
738f9de5 PS |
663 | struct smb_rqst rqst = { .rq_iov = iov, |
664 | .rq_nvec = 2 }; | |
826a95e4 | 665 | |
738f9de5 PS |
666 | iov[0].iov_base = mid->resp_buf; |
667 | iov[0].iov_len = 4; | |
668 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
669 | iov[1].iov_len = len - 4; | |
2c8f981d | 670 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 671 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 672 | mid->sequence_number); |
985e4ff0 | 673 | if (rc) |
f96637be JP |
674 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
675 | rc); | |
2c8f981d JL |
676 | } |
677 | ||
678 | /* BB special case reconnect tid and uid here? */ | |
679 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
680 | } | |
681 | ||
fec344e3 JL |
682 | struct mid_q_entry * |
683 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
684 | { |
685 | int rc; | |
fec344e3 | 686 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
687 | struct mid_q_entry *mid; |
688 | ||
738f9de5 PS |
689 | if (rqst->rq_iov[0].iov_len != 4 || |
690 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
691 | return ERR_PTR(-EIO); | |
692 | ||
792af7b0 PS |
693 | rc = allocate_mid(ses, hdr, &mid); |
694 | if (rc) | |
fec344e3 JL |
695 | return ERR_PTR(rc); |
696 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
697 | if (rc) { | |
3c1bf7e4 | 698 | cifs_delete_mid(mid); |
fec344e3 JL |
699 | return ERR_PTR(rc); |
700 | } | |
701 | return mid; | |
792af7b0 PS |
702 | } |
703 | ||
b8f57ee8 | 704 | int |
738f9de5 PS |
705 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
706 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
707 | struct kvec *resp_iov) | |
7ee1af76 JA |
708 | { |
709 | int rc = 0; | |
a891f0f8 | 710 | int timeout, optype; |
7ee1af76 | 711 | struct mid_q_entry *midQ; |
a891f0f8 | 712 | unsigned int credits = 1; |
738f9de5 | 713 | char *buf; |
50c2f753 | 714 | |
a891f0f8 PS |
715 | timeout = flags & CIFS_TIMEOUT_MASK; |
716 | optype = flags & CIFS_OP_MASK; | |
133672ef | 717 | |
a891f0f8 | 718 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
719 | |
720 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 721 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
722 | return -EIO; |
723 | } | |
724 | ||
da502f7d | 725 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 726 | return -ENOENT; |
7ee1af76 | 727 | |
792af7b0 PS |
728 | /* |
729 | * Ensure that we do not send more than 50 overlapping requests | |
730 | * to the same server. We may make this configurable later or | |
731 | * use ses->maxReq. | |
732 | */ | |
7ee1af76 | 733 | |
a891f0f8 | 734 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 735 | if (rc) |
7ee1af76 | 736 | return rc; |
7ee1af76 | 737 | |
792af7b0 PS |
738 | /* |
739 | * Make sure that we sign in the same order that we send on this socket | |
740 | * and avoid races inside tcp sendmsg code that could cause corruption | |
741 | * of smb data. | |
742 | */ | |
7ee1af76 | 743 | |
72ca545b | 744 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 745 | |
738f9de5 | 746 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 747 | if (IS_ERR(midQ)) { |
72ca545b | 748 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 749 | /* Update # of requests on wire to server */ |
a891f0f8 | 750 | add_credits(ses->server, 1, optype); |
fec344e3 | 751 | return PTR_ERR(midQ); |
1da177e4 | 752 | } |
1da177e4 | 753 | |
7c9421e1 | 754 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 755 | cifs_in_send_inc(ses->server); |
7fb8986e | 756 | rc = smb_send_rqst(ses->server, rqst, flags); |
789e6661 SF |
757 | cifs_in_send_dec(ses->server); |
758 | cifs_save_when_sent(midQ); | |
7ee1af76 | 759 | |
ad313cb8 JL |
760 | if (rc < 0) |
761 | ses->server->sequence_number -= 2; | |
72ca545b | 762 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 763 | |
da502f7d | 764 | if (rc < 0) |
7ee1af76 | 765 | goto out; |
4b8f930f | 766 | |
8bd68c6e | 767 | #ifdef CONFIG_CIFS_SMB311 |
0d5ec281 | 768 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) |
8bd68c6e AA |
769 | smb311_update_preauth_hash(ses, rqst->rq_iov+1, |
770 | rqst->rq_nvec-1); | |
771 | #endif | |
772 | ||
da502f7d | 773 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 774 | goto out; |
d6e04ae6 | 775 | |
0ade640e | 776 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 777 | if (rc != 0) { |
38bd4906 | 778 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid); |
738f9de5 | 779 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 780 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 781 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
38bd4906 | 782 | midQ->mid_flags |= MID_WAIT_CANCELLED; |
1be912dd JL |
783 | midQ->callback = DeleteMidQEntry; |
784 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 785 | add_credits(ses->server, 1, optype); |
1be912dd JL |
786 | return rc; |
787 | } | |
788 | spin_unlock(&GlobalMid_Lock); | |
789 | } | |
d6e04ae6 | 790 | |
3c1105df | 791 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 792 | if (rc != 0) { |
a891f0f8 | 793 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
794 | return rc; |
795 | } | |
50c2f753 | 796 | |
7c9421e1 | 797 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 798 | rc = -EIO; |
f96637be | 799 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
800 | goto out; |
801 | } | |
802 | ||
792af7b0 | 803 | buf = (char *)midQ->resp_buf; |
da502f7d | 804 | resp_iov->iov_base = buf; |
e19b2bc0 | 805 | resp_iov->iov_len = midQ->resp_buf_size + |
93012bf9 | 806 | ses->server->vals->header_preamble_size; |
7c9421e1 | 807 | if (midQ->large_buf) |
a891f0f8 | 808 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 809 | else |
a891f0f8 PS |
810 | *resp_buf_type = CIFS_SMALL_BUFFER; |
811 | ||
8bd68c6e | 812 | #ifdef CONFIG_CIFS_SMB311 |
0d5ec281 | 813 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { |
8bd68c6e | 814 | struct kvec iov = { |
977b6170 RS |
815 | .iov_base = buf, |
816 | .iov_len = midQ->resp_buf_size | |
8bd68c6e AA |
817 | }; |
818 | smb311_update_preauth_hash(ses, &iov, 1); | |
819 | } | |
820 | #endif | |
821 | ||
a891f0f8 | 822 | credits = ses->server->ops->get_credits(midQ); |
2b2bdfba | 823 | |
082d0642 PS |
824 | rc = ses->server->ops->check_receive(midQ, ses->server, |
825 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 826 | |
3c1bf7e4 | 827 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
828 | if ((flags & CIFS_NO_RESP) == 0) |
829 | midQ->resp_buf = NULL; | |
7ee1af76 | 830 | out: |
3c1bf7e4 | 831 | cifs_delete_mid(midQ); |
a891f0f8 | 832 | add_credits(ses->server, credits, optype); |
1da177e4 | 833 | |
d6e04ae6 SF |
834 | return rc; |
835 | } | |
1da177e4 | 836 | |
738f9de5 PS |
837 | int |
838 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
839 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
840 | const int flags, struct kvec *resp_iov) | |
841 | { | |
842 | struct smb_rqst rqst; | |
3cecf486 | 843 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
844 | int rc; |
845 | ||
3cecf486 | 846 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
847 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
848 | GFP_KERNEL); | |
117e3b7f SF |
849 | if (!new_iov) { |
850 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
851 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 852 | return -ENOMEM; |
117e3b7f | 853 | } |
3cecf486 RS |
854 | } else |
855 | new_iov = s_iov; | |
738f9de5 PS |
856 | |
857 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
858 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
859 | ||
860 | new_iov[0].iov_base = new_iov[1].iov_base; | |
861 | new_iov[0].iov_len = 4; | |
862 | new_iov[1].iov_base += 4; | |
863 | new_iov[1].iov_len -= 4; | |
864 | ||
865 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
866 | rqst.rq_iov = new_iov; | |
867 | rqst.rq_nvec = n_vec + 1; | |
868 | ||
869 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
870 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
871 | kfree(new_iov); | |
738f9de5 PS |
872 | return rc; |
873 | } | |
874 | ||
83b77391 RS |
875 | /* Like SendReceive2 but iov[0] does not contain an rfc1002 header */ |
876 | int | |
877 | smb2_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
878 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
879 | const int flags, struct kvec *resp_iov) | |
880 | { | |
881 | struct smb_rqst rqst; | |
3cecf486 | 882 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
83b77391 RS |
883 | int rc; |
884 | int i; | |
885 | __u32 count; | |
886 | __be32 rfc1002_marker; | |
887 | ||
3cecf486 | 888 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
889 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
890 | GFP_KERNEL); | |
3cecf486 RS |
891 | if (!new_iov) |
892 | return -ENOMEM; | |
893 | } else | |
894 | new_iov = s_iov; | |
83b77391 RS |
895 | |
896 | /* 1st iov is an RFC1002 Session Message length */ | |
897 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
898 | ||
899 | count = 0; | |
900 | for (i = 1; i < n_vec + 1; i++) | |
901 | count += new_iov[i].iov_len; | |
902 | ||
903 | rfc1002_marker = cpu_to_be32(count); | |
904 | ||
905 | new_iov[0].iov_base = &rfc1002_marker; | |
906 | new_iov[0].iov_len = 4; | |
907 | ||
908 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
909 | rqst.rq_iov = new_iov; | |
910 | rqst.rq_nvec = n_vec + 1; | |
911 | ||
912 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
913 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
914 | kfree(new_iov); | |
83b77391 RS |
915 | return rc; |
916 | } | |
917 | ||
1da177e4 | 918 | int |
96daf2b0 | 919 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 920 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 921 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
922 | { |
923 | int rc = 0; | |
1da177e4 | 924 | struct mid_q_entry *midQ; |
fb2036d8 PS |
925 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
926 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
927 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
928 | |
929 | if (ses == NULL) { | |
f96637be | 930 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
931 | return -EIO; |
932 | } | |
79a58d1f | 933 | if (ses->server == NULL) { |
f96637be | 934 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
935 | return -EIO; |
936 | } | |
937 | ||
79a58d1f | 938 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
939 | return -ENOENT; |
940 | ||
79a58d1f | 941 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
942 | to the same server. We may make this configurable later or |
943 | use ses->maxReq */ | |
1da177e4 | 944 | |
fb2036d8 | 945 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 946 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 947 | len); |
6d9c6d54 VL |
948 | return -EIO; |
949 | } | |
950 | ||
a891f0f8 | 951 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
952 | if (rc) |
953 | return rc; | |
954 | ||
79a58d1f | 955 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
956 | and avoid races inside tcp sendmsg code that could cause corruption |
957 | of smb data */ | |
958 | ||
72ca545b | 959 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 960 | |
7ee1af76 JA |
961 | rc = allocate_mid(ses, in_buf, &midQ); |
962 | if (rc) { | |
72ca545b | 963 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 964 | /* Update # of requests on wire to server */ |
a891f0f8 | 965 | add_credits(ses->server, 1, 0); |
7ee1af76 | 966 | return rc; |
1da177e4 LT |
967 | } |
968 | ||
ad009ac9 | 969 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
970 | if (rc) { |
971 | mutex_unlock(&ses->server->srv_mutex); | |
972 | goto out; | |
973 | } | |
1da177e4 | 974 | |
7c9421e1 | 975 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
976 | |
977 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 978 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
979 | cifs_in_send_dec(ses->server); |
980 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
981 | |
982 | if (rc < 0) | |
983 | ses->server->sequence_number -= 2; | |
984 | ||
72ca545b | 985 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 986 | |
79a58d1f | 987 | if (rc < 0) |
7ee1af76 JA |
988 | goto out; |
989 | ||
a891f0f8 | 990 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 991 | goto out; |
1da177e4 | 992 | |
0ade640e | 993 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 994 | if (rc != 0) { |
fb2036d8 | 995 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 996 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 997 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
998 | /* no longer considered to be "in-flight" */ |
999 | midQ->callback = DeleteMidQEntry; | |
1000 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 1001 | add_credits(ses->server, 1, 0); |
1be912dd JL |
1002 | return rc; |
1003 | } | |
1004 | spin_unlock(&GlobalMid_Lock); | |
1005 | } | |
1da177e4 | 1006 | |
3c1105df | 1007 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1008 | if (rc != 0) { |
a891f0f8 | 1009 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
1010 | return rc; |
1011 | } | |
50c2f753 | 1012 | |
2c8f981d | 1013 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1014 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1015 | rc = -EIO; |
f96637be | 1016 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1017 | goto out; |
1da177e4 | 1018 | } |
7ee1af76 | 1019 | |
d4e4854f | 1020 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1021 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1022 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1023 | out: |
3c1bf7e4 | 1024 | cifs_delete_mid(midQ); |
a891f0f8 | 1025 | add_credits(ses->server, 1, 0); |
1da177e4 | 1026 | |
7ee1af76 JA |
1027 | return rc; |
1028 | } | |
1da177e4 | 1029 | |
7ee1af76 JA |
1030 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1031 | blocking lock to return. */ | |
1032 | ||
1033 | static int | |
96daf2b0 | 1034 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1035 | struct smb_hdr *in_buf, |
1036 | struct smb_hdr *out_buf) | |
1037 | { | |
1038 | int bytes_returned; | |
96daf2b0 | 1039 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1040 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1041 | ||
1042 | /* We just modify the current in_buf to change | |
1043 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1044 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1045 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1046 | ||
1047 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1048 | pSMB->Timeout = 0; | |
88257360 | 1049 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1050 | |
1051 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1052 | &bytes_returned, 0); |
7ee1af76 JA |
1053 | } |
1054 | ||
1055 | int | |
96daf2b0 | 1056 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1057 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1058 | int *pbytes_returned) | |
1059 | { | |
1060 | int rc = 0; | |
1061 | int rstart = 0; | |
7ee1af76 | 1062 | struct mid_q_entry *midQ; |
96daf2b0 | 1063 | struct cifs_ses *ses; |
fb2036d8 PS |
1064 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1065 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1066 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1067 | |
1068 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1069 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1070 | return -EIO; |
1071 | } | |
1072 | ses = tcon->ses; | |
1073 | ||
79a58d1f | 1074 | if (ses->server == NULL) { |
f96637be | 1075 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1076 | return -EIO; |
1077 | } | |
1078 | ||
79a58d1f | 1079 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1080 | return -ENOENT; |
1081 | ||
79a58d1f | 1082 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1083 | to the same server. We may make this configurable later or |
1084 | use ses->maxReq */ | |
1085 | ||
fb2036d8 | 1086 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1087 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1088 | len); |
6d9c6d54 VL |
1089 | return -EIO; |
1090 | } | |
1091 | ||
a891f0f8 | 1092 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1093 | if (rc) |
1094 | return rc; | |
1095 | ||
79a58d1f | 1096 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1097 | and avoid races inside tcp sendmsg code that could cause corruption |
1098 | of smb data */ | |
1099 | ||
72ca545b | 1100 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1101 | |
1102 | rc = allocate_mid(ses, in_buf, &midQ); | |
1103 | if (rc) { | |
72ca545b | 1104 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1105 | return rc; |
1106 | } | |
1107 | ||
7ee1af76 | 1108 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1109 | if (rc) { |
3c1bf7e4 | 1110 | cifs_delete_mid(midQ); |
829049cb VL |
1111 | mutex_unlock(&ses->server->srv_mutex); |
1112 | return rc; | |
1113 | } | |
1da177e4 | 1114 | |
7c9421e1 | 1115 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1116 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1117 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1118 | cifs_in_send_dec(ses->server); |
1119 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1120 | |
1121 | if (rc < 0) | |
1122 | ses->server->sequence_number -= 2; | |
1123 | ||
72ca545b | 1124 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1125 | |
79a58d1f | 1126 | if (rc < 0) { |
3c1bf7e4 | 1127 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1128 | return rc; |
1129 | } | |
1130 | ||
1131 | /* Wait for a reply - allow signals to interrupt. */ | |
1132 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1133 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1134 | ((ses->server->tcpStatus != CifsGood) && |
1135 | (ses->server->tcpStatus != CifsNew))); | |
1136 | ||
1137 | /* Were we interrupted by a signal ? */ | |
1138 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1139 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1140 | ((ses->server->tcpStatus == CifsGood) || |
1141 | (ses->server->tcpStatus == CifsNew))) { | |
1142 | ||
1143 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1144 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1145 | blocking lock to return. */ | |
fb2036d8 | 1146 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1147 | if (rc) { |
3c1bf7e4 | 1148 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1149 | return rc; |
1150 | } | |
1151 | } else { | |
1152 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1153 | to cause the blocking lock to return. */ | |
1154 | ||
1155 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1156 | ||
1157 | /* If we get -ENOLCK back the lock may have | |
1158 | already been removed. Don't exit in this case. */ | |
1159 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1160 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1161 | return rc; |
1162 | } | |
1163 | } | |
1164 | ||
1be912dd JL |
1165 | rc = wait_for_response(ses->server, midQ); |
1166 | if (rc) { | |
fb2036d8 | 1167 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1168 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1169 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1170 | /* no longer considered to be "in-flight" */ |
1171 | midQ->callback = DeleteMidQEntry; | |
1172 | spin_unlock(&GlobalMid_Lock); | |
1173 | return rc; | |
1174 | } | |
1175 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1176 | } |
1be912dd JL |
1177 | |
1178 | /* We got the response - restart system call. */ | |
1179 | rstart = 1; | |
7ee1af76 JA |
1180 | } |
1181 | ||
3c1105df | 1182 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1183 | if (rc != 0) |
7ee1af76 | 1184 | return rc; |
50c2f753 | 1185 | |
17c8bfed | 1186 | /* rcvd frame is ok */ |
7c9421e1 | 1187 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1188 | rc = -EIO; |
f96637be | 1189 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1190 | goto out; |
1191 | } | |
1da177e4 | 1192 | |
d4e4854f | 1193 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1194 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1195 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1196 | out: |
3c1bf7e4 | 1197 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1198 | if (rstart && rc == -EACCES) |
1199 | return -ERESTARTSYS; | |
1da177e4 LT |
1200 | return rc; |
1201 | } |