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> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
33 | #include "cifspdu.h" | |
34 | #include "cifsglob.h" | |
35 | #include "cifsproto.h" | |
36 | #include "cifs_debug.h" | |
50c2f753 | 37 | |
1da177e4 | 38 | extern mempool_t *cifs_mid_poolp; |
1da177e4 | 39 | |
2b84a36c JL |
40 | static void |
41 | wake_up_task(struct mid_q_entry *mid) | |
42 | { | |
43 | wake_up_process(mid->callback_data); | |
44 | } | |
45 | ||
a6827c18 | 46 | struct mid_q_entry * |
24b9b06b | 47 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
48 | { |
49 | struct mid_q_entry *temp; | |
50 | ||
24b9b06b | 51 | if (server == NULL) { |
b6b38f70 | 52 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
53 | return NULL; |
54 | } | |
50c2f753 | 55 | |
232087cb | 56 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
57 | if (temp == NULL) |
58 | return temp; | |
59 | else { | |
26f57364 | 60 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
61 | temp->mid = smb_buffer->Mid; /* always LE */ |
62 | temp->pid = current->pid; | |
7c9421e1 PS |
63 | temp->command = cpu_to_le16(smb_buffer->Command); |
64 | cFYI(1, "For smb_command %d", smb_buffer->Command); | |
1047abc1 SF |
65 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
66 | /* when mid allocated can be before when sent */ | |
67 | temp->when_alloc = jiffies; | |
2b84a36c JL |
68 | |
69 | /* | |
70 | * The default is for the mid to be synchronous, so the | |
71 | * default callback just wakes up the current task. | |
72 | */ | |
73 | temp->callback = wake_up_task; | |
74 | temp->callback_data = current; | |
1da177e4 LT |
75 | } |
76 | ||
1da177e4 | 77 | atomic_inc(&midCount); |
7c9421e1 | 78 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
79 | return temp; |
80 | } | |
81 | ||
766fdbb5 | 82 | void |
1da177e4 LT |
83 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
84 | { | |
1047abc1 SF |
85 | #ifdef CONFIG_CIFS_STATS2 |
86 | unsigned long now; | |
87 | #endif | |
7c9421e1 | 88 | midEntry->mid_state = MID_FREE; |
8097531a | 89 | atomic_dec(&midCount); |
7c9421e1 | 90 | if (midEntry->large_buf) |
b8643e1b SF |
91 | cifs_buf_release(midEntry->resp_buf); |
92 | else | |
93 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
94 | #ifdef CONFIG_CIFS_STATS2 |
95 | now = jiffies; | |
96 | /* commands taking longer than one second are indications that | |
97 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
98 | if ((now - midEntry->when_alloc) > HZ) { |
99 | if ((cifsFYI & CIFS_TIMER) && | |
7c9421e1 PS |
100 | (midEntry->command != cpu_to_le16(SMB_COM_LOCKING_ANDX))) { |
101 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %llu", | |
1047abc1 SF |
102 | midEntry->command, midEntry->mid); |
103 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
104 | now - midEntry->when_alloc, | |
105 | now - midEntry->when_sent, | |
106 | now - midEntry->when_received); | |
107 | } | |
108 | } | |
109 | #endif | |
1da177e4 LT |
110 | mempool_free(midEntry, cifs_mid_poolp); |
111 | } | |
112 | ||
ddc8cf8f JL |
113 | static void |
114 | delete_mid(struct mid_q_entry *mid) | |
115 | { | |
116 | spin_lock(&GlobalMid_Lock); | |
117 | list_del(&mid->qhead); | |
118 | spin_unlock(&GlobalMid_Lock); | |
119 | ||
120 | DeleteMidQEntry(mid); | |
121 | } | |
122 | ||
d6e04ae6 | 123 | static int |
0496e02d | 124 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
125 | { |
126 | int rc = 0; | |
127 | int i = 0; | |
128 | struct msghdr smb_msg; | |
792af7b0 | 129 | __be32 *buf_len = (__be32 *)(iov[0].iov_base); |
3e84469d SF |
130 | unsigned int len = iov[0].iov_len; |
131 | unsigned int total_len; | |
132 | int first_vec = 0; | |
792af7b0 | 133 | unsigned int smb_buf_length = get_rfc1002_length(iov[0].iov_base); |
edf1ae40 | 134 | struct socket *ssocket = server->ssocket; |
50c2f753 | 135 | |
79a58d1f | 136 | if (ssocket == NULL) |
1da177e4 | 137 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 138 | |
a9f1b85e | 139 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 140 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
141 | smb_msg.msg_control = NULL; |
142 | smb_msg.msg_controllen = 0; | |
0496e02d | 143 | if (server->noblocksnd) |
edf1ae40 SF |
144 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
145 | else | |
146 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 | 147 | |
3e84469d SF |
148 | total_len = 0; |
149 | for (i = 0; i < n_vec; i++) | |
150 | total_len += iov[i].iov_len; | |
151 | ||
b6b38f70 | 152 | cFYI(1, "Sending smb: total_len %d", total_len); |
792af7b0 | 153 | dump_smb(iov[0].iov_base, len); |
1da177e4 | 154 | |
17680356 | 155 | i = 0; |
3e84469d SF |
156 | while (total_len) { |
157 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
158 | n_vec - first_vec, total_len); | |
1da177e4 LT |
159 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
160 | i++; | |
792af7b0 PS |
161 | /* |
162 | * If blocking send we try 3 times, since each can block | |
163 | * for 5 seconds. For nonblocking we have to try more | |
164 | * but wait increasing amounts of time allowing time for | |
165 | * socket to clear. The overall time we wait in either | |
166 | * case to send on the socket is about 15 seconds. | |
167 | * Similarly we wait for 15 seconds for a response from | |
168 | * the server in SendReceive[2] for the server to send | |
169 | * a response back for most types of requests (except | |
170 | * SMB Write past end of file which can be slow, and | |
171 | * blocking lock operations). NFS waits slightly longer | |
172 | * than CIFS, but this can make it take longer for | |
173 | * nonresponsive servers to be detected and 15 seconds | |
174 | * is more than enough time for modern networks to | |
175 | * send a packet. In most cases if we fail to send | |
176 | * after the retries we will kill the socket and | |
177 | * reconnect which may clear the network problem. | |
178 | */ | |
da505c38 | 179 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { |
b6b38f70 JP |
180 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
181 | ssocket); | |
1da177e4 LT |
182 | rc = -EAGAIN; |
183 | break; | |
184 | } | |
68058e75 | 185 | msleep(1 << i); |
1da177e4 LT |
186 | continue; |
187 | } | |
79a58d1f | 188 | if (rc < 0) |
1da177e4 | 189 | break; |
3e84469d | 190 | |
61de800d SF |
191 | if (rc == total_len) { |
192 | total_len = 0; | |
193 | break; | |
194 | } else if (rc > total_len) { | |
b6b38f70 | 195 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
196 | break; |
197 | } | |
79a58d1f | 198 | if (rc == 0) { |
3e84469d SF |
199 | /* should never happen, letting socket clear before |
200 | retrying is our only obvious option here */ | |
b6b38f70 | 201 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
202 | msleep(500); |
203 | continue; | |
d6e04ae6 | 204 | } |
3e84469d | 205 | total_len -= rc; |
68058e75 | 206 | /* the line below resets i */ |
3e84469d SF |
207 | for (i = first_vec; i < n_vec; i++) { |
208 | if (iov[i].iov_len) { | |
209 | if (rc > iov[i].iov_len) { | |
210 | rc -= iov[i].iov_len; | |
211 | iov[i].iov_len = 0; | |
212 | } else { | |
213 | iov[i].iov_base += rc; | |
214 | iov[i].iov_len -= rc; | |
215 | first_vec = i; | |
216 | break; | |
217 | } | |
218 | } | |
d6e04ae6 | 219 | } |
5e1253b5 | 220 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
221 | } |
222 | ||
edf1ae40 | 223 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
224 | cFYI(1, "partial send (%d remaining), terminating session", |
225 | total_len); | |
edf1ae40 SF |
226 | /* If we have only sent part of an SMB then the next SMB |
227 | could be taken as the remainder of this one. We need | |
228 | to kill the socket so the server throws away the partial | |
229 | SMB */ | |
230 | server->tcpStatus = CifsNeedReconnect; | |
231 | } | |
232 | ||
d804d41d | 233 | if (rc < 0 && rc != -EINTR) |
b6b38f70 | 234 | cERROR(1, "Error %d sending data on socket to server", rc); |
d804d41d | 235 | else |
1da177e4 | 236 | rc = 0; |
1da177e4 | 237 | |
792af7b0 PS |
238 | /* Don't want to modify the buffer as a side effect of this call. */ |
239 | *buf_len = cpu_to_be32(smb_buf_length); | |
7ee1af76 | 240 | |
1da177e4 LT |
241 | return rc; |
242 | } | |
243 | ||
0496e02d JL |
244 | int |
245 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
246 | unsigned int smb_buf_length) | |
247 | { | |
248 | struct kvec iov; | |
249 | ||
250 | iov.iov_base = smb_buffer; | |
251 | iov.iov_len = smb_buf_length + 4; | |
252 | ||
253 | return smb_sendv(server, &iov, 1); | |
254 | } | |
255 | ||
fc40f9cf | 256 | static int |
bc205ed1 PS |
257 | wait_for_free_credits(struct TCP_Server_Info *server, const int optype, |
258 | int *credits) | |
1da177e4 | 259 | { |
5bc59498 PS |
260 | int rc; |
261 | ||
fc40f9cf | 262 | spin_lock(&server->req_lock); |
bc205ed1 | 263 | if (optype == CIFS_ASYNC_OP) { |
1da177e4 | 264 | /* oplock breaks must not be held up */ |
fc40f9cf | 265 | server->in_flight++; |
bc205ed1 | 266 | *credits -= 1; |
fc40f9cf | 267 | spin_unlock(&server->req_lock); |
27a97a61 VL |
268 | return 0; |
269 | } | |
270 | ||
27a97a61 | 271 | while (1) { |
bc205ed1 | 272 | if (*credits <= 0) { |
fc40f9cf | 273 | spin_unlock(&server->req_lock); |
789e6661 | 274 | cifs_num_waiters_inc(server); |
5bc59498 | 275 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 276 | has_credits(server, credits)); |
789e6661 | 277 | cifs_num_waiters_dec(server); |
5bc59498 PS |
278 | if (rc) |
279 | return rc; | |
fc40f9cf | 280 | spin_lock(&server->req_lock); |
27a97a61 | 281 | } else { |
c5797a94 | 282 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 283 | spin_unlock(&server->req_lock); |
27a97a61 | 284 | return -ENOENT; |
1da177e4 | 285 | } |
27a97a61 | 286 | |
2d86dbc9 PS |
287 | /* |
288 | * Can not count locking commands against total | |
289 | * as they are allowed to block on server. | |
290 | */ | |
27a97a61 VL |
291 | |
292 | /* update # of requests on the wire to server */ | |
bc205ed1 PS |
293 | if (optype != CIFS_BLOCKING_OP) { |
294 | *credits -= 1; | |
fc40f9cf | 295 | server->in_flight++; |
2d86dbc9 | 296 | } |
fc40f9cf | 297 | spin_unlock(&server->req_lock); |
27a97a61 | 298 | break; |
1da177e4 LT |
299 | } |
300 | } | |
7ee1af76 JA |
301 | return 0; |
302 | } | |
1da177e4 | 303 | |
bc205ed1 PS |
304 | static int |
305 | wait_for_free_request(struct TCP_Server_Info *server, const int optype) | |
306 | { | |
307 | return wait_for_free_credits(server, optype, get_credits_field(server)); | |
308 | } | |
309 | ||
96daf2b0 | 310 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
311 | struct mid_q_entry **ppmidQ) |
312 | { | |
1da177e4 | 313 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 314 | return -ENOENT; |
8fbbd365 VL |
315 | } |
316 | ||
317 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 318 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 319 | return -EAGAIN; |
8fbbd365 VL |
320 | } |
321 | ||
322 | if (ses->status != CifsGood) { | |
1da177e4 | 323 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 324 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 325 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 326 | return -EAGAIN; |
ad7a2926 | 327 | /* else ok - we are setting up session */ |
1da177e4 | 328 | } |
24b9b06b | 329 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 330 | if (*ppmidQ == NULL) |
7ee1af76 | 331 | return -ENOMEM; |
ddc8cf8f JL |
332 | spin_lock(&GlobalMid_Lock); |
333 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
334 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
335 | return 0; |
336 | } | |
337 | ||
0ade640e JL |
338 | static int |
339 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 340 | { |
0ade640e | 341 | int error; |
7ee1af76 | 342 | |
f06ac72e | 343 | error = wait_event_freezekillable(server->response_q, |
7c9421e1 | 344 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
345 | if (error < 0) |
346 | return -ERESTARTSYS; | |
7ee1af76 | 347 | |
0ade640e | 348 | return 0; |
7ee1af76 JA |
349 | } |
350 | ||
792af7b0 PS |
351 | static int |
352 | cifs_setup_async_request(struct TCP_Server_Info *server, struct kvec *iov, | |
353 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
354 | { | |
355 | int rc; | |
356 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
357 | struct mid_q_entry *mid; | |
358 | ||
359 | /* enable signing if server requires it */ | |
360 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
361 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; | |
362 | ||
363 | mid = AllocMidQEntry(hdr, server); | |
364 | if (mid == NULL) | |
365 | return -ENOMEM; | |
366 | ||
367 | /* put it on the pending_mid_q */ | |
368 | spin_lock(&GlobalMid_Lock); | |
369 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
370 | spin_unlock(&GlobalMid_Lock); | |
371 | ||
372 | rc = cifs_sign_smb2(iov, nvec, server, &mid->sequence_number); | |
373 | if (rc) | |
374 | delete_mid(mid); | |
375 | *ret_mid = mid; | |
376 | return rc; | |
377 | } | |
133672ef | 378 | |
a6827c18 JL |
379 | /* |
380 | * Send a SMB request and set the callback function in the mid to handle | |
381 | * the result. Caller is responsible for dealing with timeouts. | |
382 | */ | |
383 | int | |
fcc31cb6 | 384 | cifs_call_async(struct TCP_Server_Info *server, struct kvec *iov, |
44d22d84 JL |
385 | unsigned int nvec, mid_receive_t *receive, |
386 | mid_callback_t *callback, void *cbdata, bool ignore_pend) | |
a6827c18 JL |
387 | { |
388 | int rc; | |
389 | struct mid_q_entry *mid; | |
390 | ||
59ffd841 | 391 | rc = wait_for_free_request(server, ignore_pend ? CIFS_ASYNC_OP : 0); |
a6827c18 JL |
392 | if (rc) |
393 | return rc; | |
394 | ||
395 | mutex_lock(&server->srv_mutex); | |
792af7b0 PS |
396 | rc = cifs_setup_async_request(server, iov, nvec, &mid); |
397 | if (rc) { | |
a6827c18 | 398 | mutex_unlock(&server->srv_mutex); |
2d86dbc9 | 399 | cifs_add_credits(server, 1); |
0193e072 | 400 | wake_up(&server->request_q); |
792af7b0 | 401 | return rc; |
a6827c18 JL |
402 | } |
403 | ||
44d22d84 | 404 | mid->receive = receive; |
a6827c18 JL |
405 | mid->callback = callback; |
406 | mid->callback_data = cbdata; | |
7c9421e1 | 407 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
408 | |
409 | cifs_in_send_inc(server); | |
fcc31cb6 | 410 | rc = smb_sendv(server, iov, nvec); |
789e6661 SF |
411 | cifs_in_send_dec(server); |
412 | cifs_save_when_sent(mid); | |
a6827c18 | 413 | mutex_unlock(&server->srv_mutex); |
789e6661 | 414 | |
a6827c18 JL |
415 | if (rc) |
416 | goto out_err; | |
417 | ||
418 | return rc; | |
419 | out_err: | |
420 | delete_mid(mid); | |
2d86dbc9 | 421 | cifs_add_credits(server, 1); |
a6827c18 JL |
422 | wake_up(&server->request_q); |
423 | return rc; | |
424 | } | |
425 | ||
133672ef SF |
426 | /* |
427 | * | |
428 | * Send an SMB Request. No response info (other than return code) | |
429 | * needs to be parsed. | |
430 | * | |
431 | * flags indicate the type of request buffer and how long to wait | |
432 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
433 | * | |
434 | */ | |
435 | int | |
96daf2b0 | 436 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 437 | char *in_buf, int flags) |
133672ef SF |
438 | { |
439 | int rc; | |
440 | struct kvec iov[1]; | |
441 | int resp_buf_type; | |
442 | ||
792af7b0 PS |
443 | iov[0].iov_base = in_buf; |
444 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef SF |
445 | flags |= CIFS_NO_RESP; |
446 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 447 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 448 | |
133672ef SF |
449 | return rc; |
450 | } | |
451 | ||
053d5034 | 452 | static int |
3c1105df | 453 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
454 | { |
455 | int rc = 0; | |
456 | ||
7c9421e1 PS |
457 | cFYI(1, "%s: cmd=%d mid=%llu state=%d", __func__, |
458 | le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 459 | |
74dd92a8 | 460 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 461 | switch (mid->mid_state) { |
74dd92a8 | 462 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
463 | spin_unlock(&GlobalMid_Lock); |
464 | return rc; | |
74dd92a8 JL |
465 | case MID_RETRY_NEEDED: |
466 | rc = -EAGAIN; | |
467 | break; | |
71823baf JL |
468 | case MID_RESPONSE_MALFORMED: |
469 | rc = -EIO; | |
470 | break; | |
3c1105df JL |
471 | case MID_SHUTDOWN: |
472 | rc = -EHOSTDOWN; | |
473 | break; | |
74dd92a8 | 474 | default: |
3c1105df | 475 | list_del_init(&mid->qhead); |
7c9421e1 PS |
476 | cERROR(1, "%s: invalid mid state mid=%llu state=%d", __func__, |
477 | mid->mid, mid->mid_state); | |
74dd92a8 | 478 | rc = -EIO; |
053d5034 JL |
479 | } |
480 | spin_unlock(&GlobalMid_Lock); | |
481 | ||
2b84a36c | 482 | DeleteMidQEntry(mid); |
053d5034 JL |
483 | return rc; |
484 | } | |
485 | ||
76dcc26f JL |
486 | /* |
487 | * An NT cancel request header looks just like the original request except: | |
488 | * | |
489 | * The Command is SMB_COM_NT_CANCEL | |
490 | * The WordCount is zeroed out | |
491 | * The ByteCount is zeroed out | |
492 | * | |
493 | * This function mangles an existing request buffer into a | |
494 | * SMB_COM_NT_CANCEL request and then sends it. | |
495 | */ | |
496 | static int | |
497 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
498 | struct mid_q_entry *mid) | |
499 | { | |
500 | int rc = 0; | |
501 | ||
502 | /* -4 for RFC1001 length and +2 for BCC field */ | |
be8e3b00 | 503 | in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); |
76dcc26f JL |
504 | in_buf->Command = SMB_COM_NT_CANCEL; |
505 | in_buf->WordCount = 0; | |
820a803f | 506 | put_bcc(0, in_buf); |
76dcc26f JL |
507 | |
508 | mutex_lock(&server->srv_mutex); | |
509 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
510 | if (rc) { | |
511 | mutex_unlock(&server->srv_mutex); | |
512 | return rc; | |
513 | } | |
be8e3b00 | 514 | rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
76dcc26f JL |
515 | mutex_unlock(&server->srv_mutex); |
516 | ||
517 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
518 | in_buf->Mid, rc); | |
519 | ||
520 | return rc; | |
521 | } | |
522 | ||
2c8f981d JL |
523 | int |
524 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
525 | bool log_error) | |
526 | { | |
792af7b0 | 527 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
528 | |
529 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
530 | |
531 | /* convert the length into a more usable form */ | |
96daf2b0 | 532 | if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { |
826a95e4 JL |
533 | struct kvec iov; |
534 | ||
535 | iov.iov_base = mid->resp_buf; | |
536 | iov.iov_len = len; | |
2c8f981d | 537 | /* FIXME: add code to kill session */ |
826a95e4 | 538 | if (cifs_verify_signature(&iov, 1, server, |
2c8f981d JL |
539 | mid->sequence_number + 1) != 0) |
540 | cERROR(1, "Unexpected SMB signature"); | |
541 | } | |
542 | ||
543 | /* BB special case reconnect tid and uid here? */ | |
544 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
545 | } | |
546 | ||
792af7b0 PS |
547 | static int |
548 | cifs_setup_request(struct cifs_ses *ses, struct kvec *iov, | |
549 | unsigned int nvec, struct mid_q_entry **ret_mid) | |
550 | { | |
551 | int rc; | |
552 | struct smb_hdr *hdr = (struct smb_hdr *)iov[0].iov_base; | |
553 | struct mid_q_entry *mid; | |
554 | ||
555 | rc = allocate_mid(ses, hdr, &mid); | |
556 | if (rc) | |
557 | return rc; | |
558 | rc = cifs_sign_smb2(iov, nvec, ses->server, &mid->sequence_number); | |
559 | if (rc) | |
560 | delete_mid(mid); | |
561 | *ret_mid = mid; | |
562 | return rc; | |
563 | } | |
564 | ||
7ee1af76 | 565 | int |
96daf2b0 | 566 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, |
79a58d1f | 567 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, |
133672ef | 568 | const int flags) |
7ee1af76 JA |
569 | { |
570 | int rc = 0; | |
133672ef | 571 | int long_op; |
7ee1af76 | 572 | struct mid_q_entry *midQ; |
792af7b0 | 573 | char *buf = iov[0].iov_base; |
50c2f753 | 574 | |
133672ef SF |
575 | long_op = flags & CIFS_TIMEOUT_MASK; |
576 | ||
7ee1af76 JA |
577 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
578 | ||
579 | if ((ses == NULL) || (ses->server == NULL)) { | |
792af7b0 | 580 | cifs_small_buf_release(buf); |
b6b38f70 | 581 | cERROR(1, "Null session"); |
7ee1af76 JA |
582 | return -EIO; |
583 | } | |
584 | ||
79a58d1f | 585 | if (ses->server->tcpStatus == CifsExiting) { |
792af7b0 | 586 | cifs_small_buf_release(buf); |
7ee1af76 JA |
587 | return -ENOENT; |
588 | } | |
589 | ||
792af7b0 PS |
590 | /* |
591 | * Ensure that we do not send more than 50 overlapping requests | |
592 | * to the same server. We may make this configurable later or | |
593 | * use ses->maxReq. | |
594 | */ | |
7ee1af76 | 595 | |
c5797a94 | 596 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 | 597 | if (rc) { |
792af7b0 | 598 | cifs_small_buf_release(buf); |
7ee1af76 JA |
599 | return rc; |
600 | } | |
601 | ||
792af7b0 PS |
602 | /* |
603 | * Make sure that we sign in the same order that we send on this socket | |
604 | * and avoid races inside tcp sendmsg code that could cause corruption | |
605 | * of smb data. | |
606 | */ | |
7ee1af76 | 607 | |
72ca545b | 608 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 609 | |
792af7b0 | 610 | rc = cifs_setup_request(ses, iov, n_vec, &midQ); |
7ee1af76 | 611 | if (rc) { |
72ca545b | 612 | mutex_unlock(&ses->server->srv_mutex); |
792af7b0 | 613 | cifs_small_buf_release(buf); |
7ee1af76 | 614 | /* Update # of requests on wire to server */ |
2d86dbc9 | 615 | cifs_add_credits(ses->server, 1); |
7ee1af76 | 616 | return rc; |
1da177e4 | 617 | } |
1da177e4 | 618 | |
7c9421e1 | 619 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 620 | cifs_in_send_inc(ses->server); |
0496e02d | 621 | rc = smb_sendv(ses->server, iov, n_vec); |
789e6661 SF |
622 | cifs_in_send_dec(ses->server); |
623 | cifs_save_when_sent(midQ); | |
7ee1af76 | 624 | |
72ca545b | 625 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 626 | |
2db7c581 | 627 | if (rc < 0) { |
792af7b0 | 628 | cifs_small_buf_release(buf); |
7ee1af76 | 629 | goto out; |
2db7c581 | 630 | } |
4b8f930f | 631 | |
2db7c581 | 632 | if (long_op == CIFS_ASYNC_OP) { |
792af7b0 | 633 | cifs_small_buf_release(buf); |
133672ef | 634 | goto out; |
2db7c581 | 635 | } |
d6e04ae6 | 636 | |
0ade640e | 637 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 638 | if (rc != 0) { |
792af7b0 | 639 | send_nt_cancel(ses->server, (struct smb_hdr *)buf, midQ); |
1be912dd | 640 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 641 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
642 | midQ->callback = DeleteMidQEntry; |
643 | spin_unlock(&GlobalMid_Lock); | |
792af7b0 | 644 | cifs_small_buf_release(buf); |
2d86dbc9 | 645 | cifs_add_credits(ses->server, 1); |
1be912dd JL |
646 | return rc; |
647 | } | |
648 | spin_unlock(&GlobalMid_Lock); | |
649 | } | |
d6e04ae6 | 650 | |
792af7b0 | 651 | cifs_small_buf_release(buf); |
2db7c581 | 652 | |
3c1105df | 653 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 654 | if (rc != 0) { |
2d86dbc9 | 655 | cifs_add_credits(ses->server, 1); |
d6e04ae6 SF |
656 | return rc; |
657 | } | |
50c2f753 | 658 | |
7c9421e1 | 659 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 660 | rc = -EIO; |
2c8f981d | 661 | cFYI(1, "Bad MID state?"); |
2b2bdfba SF |
662 | goto out; |
663 | } | |
664 | ||
792af7b0 PS |
665 | buf = (char *)midQ->resp_buf; |
666 | iov[0].iov_base = buf; | |
667 | iov[0].iov_len = get_rfc1002_length(buf) + 4; | |
7c9421e1 | 668 | if (midQ->large_buf) |
2c8f981d JL |
669 | *pRespBufType = CIFS_LARGE_BUFFER; |
670 | else | |
671 | *pRespBufType = CIFS_SMALL_BUFFER; | |
2b2bdfba | 672 | |
2c8f981d | 673 | rc = cifs_check_receive(midQ, ses->server, flags & CIFS_LOG_ERROR); |
1da177e4 | 674 | |
2c8f981d JL |
675 | /* mark it so buf will not be freed by delete_mid */ |
676 | if ((flags & CIFS_NO_RESP) == 0) | |
677 | midQ->resp_buf = NULL; | |
7ee1af76 | 678 | out: |
ddc8cf8f | 679 | delete_mid(midQ); |
2d86dbc9 | 680 | cifs_add_credits(ses->server, 1); |
1da177e4 | 681 | |
d6e04ae6 SF |
682 | return rc; |
683 | } | |
1da177e4 LT |
684 | |
685 | int | |
96daf2b0 | 686 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 LT |
687 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
688 | int *pbytes_returned, const int long_op) | |
689 | { | |
690 | int rc = 0; | |
1da177e4 LT |
691 | struct mid_q_entry *midQ; |
692 | ||
693 | if (ses == NULL) { | |
b6b38f70 | 694 | cERROR(1, "Null smb session"); |
1da177e4 LT |
695 | return -EIO; |
696 | } | |
79a58d1f | 697 | if (ses->server == NULL) { |
b6b38f70 | 698 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
699 | return -EIO; |
700 | } | |
701 | ||
79a58d1f | 702 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
703 | return -ENOENT; |
704 | ||
79a58d1f | 705 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
706 | to the same server. We may make this configurable later or |
707 | use ses->maxReq */ | |
1da177e4 | 708 | |
be8e3b00 SF |
709 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
710 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 711 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 712 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
713 | return -EIO; |
714 | } | |
715 | ||
c5797a94 | 716 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
717 | if (rc) |
718 | return rc; | |
719 | ||
79a58d1f | 720 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
721 | and avoid races inside tcp sendmsg code that could cause corruption |
722 | of smb data */ | |
723 | ||
72ca545b | 724 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 725 | |
7ee1af76 JA |
726 | rc = allocate_mid(ses, in_buf, &midQ); |
727 | if (rc) { | |
72ca545b | 728 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 729 | /* Update # of requests on wire to server */ |
2d86dbc9 | 730 | cifs_add_credits(ses->server, 1); |
7ee1af76 | 731 | return rc; |
1da177e4 LT |
732 | } |
733 | ||
ad009ac9 | 734 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
735 | if (rc) { |
736 | mutex_unlock(&ses->server->srv_mutex); | |
737 | goto out; | |
738 | } | |
1da177e4 | 739 | |
7c9421e1 | 740 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
741 | |
742 | cifs_in_send_inc(ses->server); | |
be8e3b00 | 743 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
744 | cifs_in_send_dec(ses->server); |
745 | cifs_save_when_sent(midQ); | |
72ca545b | 746 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 747 | |
79a58d1f | 748 | if (rc < 0) |
7ee1af76 JA |
749 | goto out; |
750 | ||
0ade640e | 751 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 752 | goto out; |
1da177e4 | 753 | |
0ade640e | 754 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 755 | if (rc != 0) { |
2db7c581 | 756 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd | 757 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 758 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
759 | /* no longer considered to be "in-flight" */ |
760 | midQ->callback = DeleteMidQEntry; | |
761 | spin_unlock(&GlobalMid_Lock); | |
2d86dbc9 | 762 | cifs_add_credits(ses->server, 1); |
1be912dd JL |
763 | return rc; |
764 | } | |
765 | spin_unlock(&GlobalMid_Lock); | |
766 | } | |
1da177e4 | 767 | |
3c1105df | 768 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 769 | if (rc != 0) { |
2d86dbc9 | 770 | cifs_add_credits(ses->server, 1); |
1da177e4 LT |
771 | return rc; |
772 | } | |
50c2f753 | 773 | |
2c8f981d | 774 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 775 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 776 | rc = -EIO; |
b6b38f70 | 777 | cERROR(1, "Bad MID state?"); |
2c8f981d | 778 | goto out; |
1da177e4 | 779 | } |
7ee1af76 | 780 | |
d4e4854f | 781 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
782 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
783 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 784 | out: |
ddc8cf8f | 785 | delete_mid(midQ); |
2d86dbc9 | 786 | cifs_add_credits(ses->server, 1); |
1da177e4 | 787 | |
7ee1af76 JA |
788 | return rc; |
789 | } | |
1da177e4 | 790 | |
7ee1af76 JA |
791 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
792 | blocking lock to return. */ | |
793 | ||
794 | static int | |
96daf2b0 | 795 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
796 | struct smb_hdr *in_buf, |
797 | struct smb_hdr *out_buf) | |
798 | { | |
799 | int bytes_returned; | |
96daf2b0 | 800 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
801 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
802 | ||
803 | /* We just modify the current in_buf to change | |
804 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
805 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
806 | LOCKING_ANDX_CANCEL_LOCK. */ | |
807 | ||
808 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
809 | pSMB->Timeout = 0; | |
810 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
811 | ||
812 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 813 | &bytes_returned, 0); |
7ee1af76 JA |
814 | } |
815 | ||
816 | int | |
96daf2b0 | 817 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
818 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
819 | int *pbytes_returned) | |
820 | { | |
821 | int rc = 0; | |
822 | int rstart = 0; | |
7ee1af76 | 823 | struct mid_q_entry *midQ; |
96daf2b0 | 824 | struct cifs_ses *ses; |
7ee1af76 JA |
825 | |
826 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 827 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
828 | return -EIO; |
829 | } | |
830 | ses = tcon->ses; | |
831 | ||
79a58d1f | 832 | if (ses->server == NULL) { |
b6b38f70 | 833 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
834 | return -EIO; |
835 | } | |
836 | ||
79a58d1f | 837 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
838 | return -ENOENT; |
839 | ||
79a58d1f | 840 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
841 | to the same server. We may make this configurable later or |
842 | use ses->maxReq */ | |
843 | ||
be8e3b00 SF |
844 | if (be32_to_cpu(in_buf->smb_buf_length) > CIFSMaxBufSize + |
845 | MAX_CIFS_HDR_SIZE - 4) { | |
b6b38f70 | 846 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
be8e3b00 | 847 | be32_to_cpu(in_buf->smb_buf_length)); |
6d9c6d54 VL |
848 | return -EIO; |
849 | } | |
850 | ||
c5797a94 | 851 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
852 | if (rc) |
853 | return rc; | |
854 | ||
79a58d1f | 855 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
856 | and avoid races inside tcp sendmsg code that could cause corruption |
857 | of smb data */ | |
858 | ||
72ca545b | 859 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
860 | |
861 | rc = allocate_mid(ses, in_buf, &midQ); | |
862 | if (rc) { | |
72ca545b | 863 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
864 | return rc; |
865 | } | |
866 | ||
7ee1af76 | 867 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 868 | if (rc) { |
ddc8cf8f | 869 | delete_mid(midQ); |
829049cb VL |
870 | mutex_unlock(&ses->server->srv_mutex); |
871 | return rc; | |
872 | } | |
1da177e4 | 873 | |
7c9421e1 | 874 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 875 | cifs_in_send_inc(ses->server); |
be8e3b00 | 876 | rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); |
789e6661 SF |
877 | cifs_in_send_dec(ses->server); |
878 | cifs_save_when_sent(midQ); | |
72ca545b | 879 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 880 | |
79a58d1f | 881 | if (rc < 0) { |
ddc8cf8f | 882 | delete_mid(midQ); |
7ee1af76 JA |
883 | return rc; |
884 | } | |
885 | ||
886 | /* Wait for a reply - allow signals to interrupt. */ | |
887 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 888 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
889 | ((ses->server->tcpStatus != CifsGood) && |
890 | (ses->server->tcpStatus != CifsNew))); | |
891 | ||
892 | /* Were we interrupted by a signal ? */ | |
893 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 894 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
895 | ((ses->server->tcpStatus == CifsGood) || |
896 | (ses->server->tcpStatus == CifsNew))) { | |
897 | ||
898 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
899 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
900 | blocking lock to return. */ | |
76dcc26f | 901 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 902 | if (rc) { |
ddc8cf8f | 903 | delete_mid(midQ); |
7ee1af76 JA |
904 | return rc; |
905 | } | |
906 | } else { | |
907 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
908 | to cause the blocking lock to return. */ | |
909 | ||
910 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
911 | ||
912 | /* If we get -ENOLCK back the lock may have | |
913 | already been removed. Don't exit in this case. */ | |
914 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 915 | delete_mid(midQ); |
7ee1af76 JA |
916 | return rc; |
917 | } | |
918 | } | |
919 | ||
1be912dd JL |
920 | rc = wait_for_response(ses->server, midQ); |
921 | if (rc) { | |
2db7c581 | 922 | send_nt_cancel(ses->server, in_buf, midQ); |
1be912dd | 923 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 924 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
925 | /* no longer considered to be "in-flight" */ |
926 | midQ->callback = DeleteMidQEntry; | |
927 | spin_unlock(&GlobalMid_Lock); | |
928 | return rc; | |
929 | } | |
930 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 931 | } |
1be912dd JL |
932 | |
933 | /* We got the response - restart system call. */ | |
934 | rstart = 1; | |
7ee1af76 JA |
935 | } |
936 | ||
3c1105df | 937 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 938 | if (rc != 0) |
7ee1af76 | 939 | return rc; |
50c2f753 | 940 | |
17c8bfed | 941 | /* rcvd frame is ok */ |
7c9421e1 | 942 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 943 | rc = -EIO; |
b6b38f70 | 944 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
945 | goto out; |
946 | } | |
1da177e4 | 947 | |
d4e4854f | 948 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
949 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
950 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 951 | out: |
ddc8cf8f | 952 | delete_mid(midQ); |
7ee1af76 JA |
953 | if (rstart && rc == -EACCES) |
954 | return -ERESTARTSYS; | |
1da177e4 LT |
955 | return rc; |
956 | } |