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> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/processor.h> | |
31 | #include <linux/mempool.h> | |
32 | #include "cifspdu.h" | |
33 | #include "cifsglob.h" | |
34 | #include "cifsproto.h" | |
35 | #include "cifs_debug.h" | |
50c2f753 | 36 | |
1da177e4 | 37 | extern mempool_t *cifs_mid_poolp; |
1da177e4 | 38 | |
2b84a36c JL |
39 | static void |
40 | wake_up_task(struct mid_q_entry *mid) | |
41 | { | |
42 | wake_up_process(mid->callback_data); | |
43 | } | |
44 | ||
a6827c18 | 45 | struct mid_q_entry * |
24b9b06b | 46 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
47 | { |
48 | struct mid_q_entry *temp; | |
49 | ||
24b9b06b | 50 | if (server == NULL) { |
b6b38f70 | 51 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
52 | return NULL; |
53 | } | |
50c2f753 | 54 | |
232087cb | 55 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
56 | if (temp == NULL) |
57 | return temp; | |
58 | else { | |
26f57364 | 59 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
60 | temp->mid = smb_buffer->Mid; /* always LE */ |
61 | temp->pid = current->pid; | |
62 | temp->command = smb_buffer->Command; | |
b6b38f70 | 63 | cFYI(1, "For smb_command %d", temp->command); |
1047abc1 SF |
64 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
65 | /* when mid allocated can be before when sent */ | |
66 | temp->when_alloc = jiffies; | |
2b84a36c JL |
67 | |
68 | /* | |
69 | * The default is for the mid to be synchronous, so the | |
70 | * default callback just wakes up the current task. | |
71 | */ | |
72 | temp->callback = wake_up_task; | |
73 | temp->callback_data = current; | |
1da177e4 LT |
74 | } |
75 | ||
1da177e4 LT |
76 | atomic_inc(&midCount); |
77 | temp->midState = MID_REQUEST_ALLOCATED; | |
1da177e4 LT |
78 | return temp; |
79 | } | |
80 | ||
766fdbb5 | 81 | void |
1da177e4 LT |
82 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
83 | { | |
1047abc1 SF |
84 | #ifdef CONFIG_CIFS_STATS2 |
85 | unsigned long now; | |
86 | #endif | |
1da177e4 | 87 | midEntry->midState = MID_FREE; |
8097531a | 88 | atomic_dec(&midCount); |
79a58d1f | 89 | if (midEntry->largeBuf) |
b8643e1b SF |
90 | cifs_buf_release(midEntry->resp_buf); |
91 | else | |
92 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
93 | #ifdef CONFIG_CIFS_STATS2 |
94 | now = jiffies; | |
95 | /* commands taking longer than one second are indications that | |
96 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
97 | if ((now - midEntry->when_alloc) > HZ) { |
98 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
99 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
100 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
101 | midEntry->command, midEntry->mid); | |
102 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
103 | now - midEntry->when_alloc, | |
104 | now - midEntry->when_sent, | |
105 | now - midEntry->when_received); | |
106 | } | |
107 | } | |
108 | #endif | |
1da177e4 LT |
109 | mempool_free(midEntry, cifs_mid_poolp); |
110 | } | |
111 | ||
ddc8cf8f JL |
112 | static void |
113 | delete_mid(struct mid_q_entry *mid) | |
114 | { | |
115 | spin_lock(&GlobalMid_Lock); | |
116 | list_del(&mid->qhead); | |
117 | spin_unlock(&GlobalMid_Lock); | |
118 | ||
119 | DeleteMidQEntry(mid); | |
120 | } | |
121 | ||
d6e04ae6 | 122 | static int |
0496e02d | 123 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
124 | { |
125 | int rc = 0; | |
126 | int i = 0; | |
127 | struct msghdr smb_msg; | |
3e84469d SF |
128 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
129 | unsigned int len = iov[0].iov_len; | |
130 | unsigned int total_len; | |
131 | int first_vec = 0; | |
7ee1af76 | 132 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 133 | struct socket *ssocket = server->ssocket; |
50c2f753 | 134 | |
79a58d1f | 135 | if (ssocket == NULL) |
1da177e4 | 136 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 137 | |
a9f1b85e | 138 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 139 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
140 | smb_msg.msg_control = NULL; |
141 | smb_msg.msg_controllen = 0; | |
0496e02d | 142 | if (server->noblocksnd) |
edf1ae40 SF |
143 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
144 | else | |
145 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
146 | |
147 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
148 | area, and byte area if necessary, is converted to littleendian in |
149 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
150 | Flags2 is converted in SendReceive */ |
151 | ||
3e84469d SF |
152 | |
153 | total_len = 0; | |
154 | for (i = 0; i < n_vec; i++) | |
155 | total_len += iov[i].iov_len; | |
156 | ||
1da177e4 | 157 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
b6b38f70 | 158 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
159 | dump_smb(smb_buffer, len); |
160 | ||
17680356 | 161 | i = 0; |
3e84469d SF |
162 | while (total_len) { |
163 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
164 | n_vec - first_vec, total_len); | |
1da177e4 LT |
165 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
166 | i++; | |
da505c38 SF |
167 | /* if blocking send we try 3 times, since each can block |
168 | for 5 seconds. For nonblocking we have to try more | |
169 | but wait increasing amounts of time allowing time for | |
170 | socket to clear. The overall time we wait in either | |
171 | case to send on the socket is about 15 seconds. | |
172 | Similarly we wait for 15 seconds for | |
173 | a response from the server in SendReceive[2] | |
174 | for the server to send a response back for | |
175 | most types of requests (except SMB Write | |
176 | past end of file which can be slow, and | |
177 | blocking lock operations). NFS waits slightly longer | |
178 | than CIFS, but this can make it take longer for | |
179 | nonresponsive servers to be detected and 15 seconds | |
180 | is more than enough time for modern networks to | |
181 | send a packet. In most cases if we fail to send | |
182 | after the retries we will kill the socket and | |
183 | reconnect which may clear the network problem. | |
184 | */ | |
185 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
186 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
187 | ssocket); | |
1da177e4 LT |
188 | rc = -EAGAIN; |
189 | break; | |
190 | } | |
68058e75 | 191 | msleep(1 << i); |
1da177e4 LT |
192 | continue; |
193 | } | |
79a58d1f | 194 | if (rc < 0) |
1da177e4 | 195 | break; |
3e84469d | 196 | |
61de800d SF |
197 | if (rc == total_len) { |
198 | total_len = 0; | |
199 | break; | |
200 | } else if (rc > total_len) { | |
b6b38f70 | 201 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
202 | break; |
203 | } | |
79a58d1f | 204 | if (rc == 0) { |
3e84469d SF |
205 | /* should never happen, letting socket clear before |
206 | retrying is our only obvious option here */ | |
b6b38f70 | 207 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
208 | msleep(500); |
209 | continue; | |
d6e04ae6 | 210 | } |
3e84469d | 211 | total_len -= rc; |
68058e75 | 212 | /* the line below resets i */ |
3e84469d SF |
213 | for (i = first_vec; i < n_vec; i++) { |
214 | if (iov[i].iov_len) { | |
215 | if (rc > iov[i].iov_len) { | |
216 | rc -= iov[i].iov_len; | |
217 | iov[i].iov_len = 0; | |
218 | } else { | |
219 | iov[i].iov_base += rc; | |
220 | iov[i].iov_len -= rc; | |
221 | first_vec = i; | |
222 | break; | |
223 | } | |
224 | } | |
d6e04ae6 | 225 | } |
5e1253b5 | 226 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
227 | } |
228 | ||
edf1ae40 | 229 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
230 | cFYI(1, "partial send (%d remaining), terminating session", |
231 | total_len); | |
edf1ae40 SF |
232 | /* If we have only sent part of an SMB then the next SMB |
233 | could be taken as the remainder of this one. We need | |
234 | to kill the socket so the server throws away the partial | |
235 | SMB */ | |
236 | server->tcpStatus = CifsNeedReconnect; | |
237 | } | |
238 | ||
1da177e4 | 239 | if (rc < 0) { |
b6b38f70 | 240 | cERROR(1, "Error %d sending data on socket to server", rc); |
3e84469d | 241 | } else |
1da177e4 | 242 | rc = 0; |
1da177e4 | 243 | |
7ee1af76 JA |
244 | /* Don't want to modify the buffer as a |
245 | side effect of this call. */ | |
246 | smb_buffer->smb_buf_length = smb_buf_length; | |
247 | ||
1da177e4 LT |
248 | return rc; |
249 | } | |
250 | ||
0496e02d JL |
251 | int |
252 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
253 | unsigned int smb_buf_length) | |
254 | { | |
255 | struct kvec iov; | |
256 | ||
257 | iov.iov_base = smb_buffer; | |
258 | iov.iov_len = smb_buf_length + 4; | |
259 | ||
260 | return smb_sendv(server, &iov, 1); | |
261 | } | |
262 | ||
c5797a94 JL |
263 | static int wait_for_free_request(struct TCP_Server_Info *server, |
264 | const int long_op) | |
1da177e4 | 265 | { |
133672ef | 266 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 267 | /* oplock breaks must not be held up */ |
c5797a94 | 268 | atomic_inc(&server->inFlight); |
27a97a61 VL |
269 | return 0; |
270 | } | |
271 | ||
272 | spin_lock(&GlobalMid_Lock); | |
273 | while (1) { | |
c5797a94 | 274 | if (atomic_read(&server->inFlight) >= cifs_max_pending) { |
27a97a61 | 275 | spin_unlock(&GlobalMid_Lock); |
131afd0b | 276 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 277 | atomic_inc(&server->num_waiters); |
131afd0b | 278 | #endif |
c5797a94 JL |
279 | wait_event(server->request_q, |
280 | atomic_read(&server->inFlight) | |
27a97a61 | 281 | < cifs_max_pending); |
131afd0b | 282 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 283 | atomic_dec(&server->num_waiters); |
131afd0b | 284 | #endif |
27a97a61 VL |
285 | spin_lock(&GlobalMid_Lock); |
286 | } else { | |
c5797a94 | 287 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 288 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 289 | return -ENOENT; |
1da177e4 | 290 | } |
27a97a61 VL |
291 | |
292 | /* can not count locking commands against total | |
293 | as they are allowed to block on server */ | |
294 | ||
295 | /* update # of requests on the wire to server */ | |
296 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 297 | atomic_inc(&server->inFlight); |
27a97a61 VL |
298 | spin_unlock(&GlobalMid_Lock); |
299 | break; | |
1da177e4 LT |
300 | } |
301 | } | |
7ee1af76 JA |
302 | return 0; |
303 | } | |
1da177e4 | 304 | |
7ee1af76 JA |
305 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
306 | struct mid_q_entry **ppmidQ) | |
307 | { | |
1da177e4 | 308 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 309 | return -ENOENT; |
8fbbd365 VL |
310 | } |
311 | ||
312 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 313 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 314 | return -EAGAIN; |
8fbbd365 VL |
315 | } |
316 | ||
317 | if (ses->status != CifsGood) { | |
1da177e4 | 318 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 319 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 320 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 321 | return -EAGAIN; |
ad7a2926 | 322 | /* else ok - we are setting up session */ |
1da177e4 | 323 | } |
24b9b06b | 324 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 325 | if (*ppmidQ == NULL) |
7ee1af76 | 326 | return -ENOMEM; |
ddc8cf8f JL |
327 | spin_lock(&GlobalMid_Lock); |
328 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
329 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
330 | return 0; |
331 | } | |
332 | ||
0ade640e JL |
333 | static int |
334 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 335 | { |
0ade640e | 336 | int error; |
7ee1af76 | 337 | |
0ade640e JL |
338 | error = wait_event_killable(server->response_q, |
339 | midQ->midState != MID_REQUEST_SUBMITTED); | |
340 | if (error < 0) | |
341 | return -ERESTARTSYS; | |
7ee1af76 | 342 | |
0ade640e | 343 | return 0; |
7ee1af76 JA |
344 | } |
345 | ||
133672ef | 346 | |
a6827c18 JL |
347 | /* |
348 | * Send a SMB request and set the callback function in the mid to handle | |
349 | * the result. Caller is responsible for dealing with timeouts. | |
350 | */ | |
351 | int | |
352 | cifs_call_async(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
353 | mid_callback_t *callback, void *cbdata) | |
354 | { | |
355 | int rc; | |
356 | struct mid_q_entry *mid; | |
357 | ||
358 | rc = wait_for_free_request(server, CIFS_ASYNC_OP); | |
359 | if (rc) | |
360 | return rc; | |
361 | ||
362 | mutex_lock(&server->srv_mutex); | |
363 | mid = AllocMidQEntry(in_buf, server); | |
364 | if (mid == NULL) { | |
365 | mutex_unlock(&server->srv_mutex); | |
366 | return -ENOMEM; | |
367 | } | |
368 | ||
369 | /* put it on the pending_mid_q */ | |
370 | spin_lock(&GlobalMid_Lock); | |
371 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
372 | spin_unlock(&GlobalMid_Lock); | |
373 | ||
374 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
375 | if (rc) { | |
376 | mutex_unlock(&server->srv_mutex); | |
377 | goto out_err; | |
378 | } | |
379 | ||
380 | mid->callback = callback; | |
381 | mid->callback_data = cbdata; | |
382 | mid->midState = MID_REQUEST_SUBMITTED; | |
383 | #ifdef CONFIG_CIFS_STATS2 | |
384 | atomic_inc(&server->inSend); | |
385 | #endif | |
386 | rc = smb_send(server, in_buf, in_buf->smb_buf_length); | |
387 | #ifdef CONFIG_CIFS_STATS2 | |
388 | atomic_dec(&server->inSend); | |
389 | mid->when_sent = jiffies; | |
390 | #endif | |
391 | mutex_unlock(&server->srv_mutex); | |
392 | if (rc) | |
393 | goto out_err; | |
394 | ||
395 | return rc; | |
396 | out_err: | |
397 | delete_mid(mid); | |
398 | atomic_dec(&server->inFlight); | |
399 | wake_up(&server->request_q); | |
400 | return rc; | |
401 | } | |
402 | ||
133672ef SF |
403 | /* |
404 | * | |
405 | * Send an SMB Request. No response info (other than return code) | |
406 | * needs to be parsed. | |
407 | * | |
408 | * flags indicate the type of request buffer and how long to wait | |
409 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
410 | * | |
411 | */ | |
412 | int | |
413 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
414 | struct smb_hdr *in_buf, int flags) | |
415 | { | |
416 | int rc; | |
417 | struct kvec iov[1]; | |
418 | int resp_buf_type; | |
419 | ||
420 | iov[0].iov_base = (char *)in_buf; | |
421 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
422 | flags |= CIFS_NO_RESP; | |
423 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 424 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 425 | |
133672ef SF |
426 | return rc; |
427 | } | |
428 | ||
053d5034 JL |
429 | static int |
430 | sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) | |
431 | { | |
432 | int rc = 0; | |
433 | ||
74dd92a8 JL |
434 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
435 | mid->mid, mid->midState); | |
053d5034 | 436 | |
74dd92a8 | 437 | spin_lock(&GlobalMid_Lock); |
2b84a36c JL |
438 | /* ensure that it's no longer on the pending_mid_q */ |
439 | list_del_init(&mid->qhead); | |
440 | ||
74dd92a8 JL |
441 | switch (mid->midState) { |
442 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
443 | spin_unlock(&GlobalMid_Lock); |
444 | return rc; | |
74dd92a8 JL |
445 | case MID_REQUEST_SUBMITTED: |
446 | /* socket is going down, reject all calls */ | |
447 | if (server->tcpStatus == CifsExiting) { | |
448 | cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d", | |
449 | __func__, mid->mid, mid->command, mid->midState); | |
053d5034 | 450 | rc = -EHOSTDOWN; |
74dd92a8 | 451 | break; |
053d5034 | 452 | } |
74dd92a8 JL |
453 | case MID_RETRY_NEEDED: |
454 | rc = -EAGAIN; | |
455 | break; | |
456 | default: | |
457 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, | |
458 | mid->mid, mid->midState); | |
459 | rc = -EIO; | |
053d5034 JL |
460 | } |
461 | spin_unlock(&GlobalMid_Lock); | |
462 | ||
2b84a36c | 463 | DeleteMidQEntry(mid); |
053d5034 JL |
464 | return rc; |
465 | } | |
466 | ||
76dcc26f JL |
467 | /* |
468 | * An NT cancel request header looks just like the original request except: | |
469 | * | |
470 | * The Command is SMB_COM_NT_CANCEL | |
471 | * The WordCount is zeroed out | |
472 | * The ByteCount is zeroed out | |
473 | * | |
474 | * This function mangles an existing request buffer into a | |
475 | * SMB_COM_NT_CANCEL request and then sends it. | |
476 | */ | |
477 | static int | |
478 | send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
479 | struct mid_q_entry *mid) | |
480 | { | |
481 | int rc = 0; | |
482 | ||
483 | /* -4 for RFC1001 length and +2 for BCC field */ | |
484 | in_buf->smb_buf_length = sizeof(struct smb_hdr) - 4 + 2; | |
485 | in_buf->Command = SMB_COM_NT_CANCEL; | |
486 | in_buf->WordCount = 0; | |
487 | BCC_LE(in_buf) = 0; | |
488 | ||
489 | mutex_lock(&server->srv_mutex); | |
490 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
491 | if (rc) { | |
492 | mutex_unlock(&server->srv_mutex); | |
493 | return rc; | |
494 | } | |
495 | rc = smb_send(server, in_buf, in_buf->smb_buf_length); | |
496 | mutex_unlock(&server->srv_mutex); | |
497 | ||
498 | cFYI(1, "issued NT_CANCEL for mid %u, rc = %d", | |
499 | in_buf->Mid, rc); | |
500 | ||
501 | return rc; | |
502 | } | |
503 | ||
7ee1af76 | 504 | int |
79a58d1f SF |
505 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
506 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 507 | const int flags) |
7ee1af76 JA |
508 | { |
509 | int rc = 0; | |
133672ef | 510 | int long_op; |
7ee1af76 | 511 | unsigned int receive_len; |
7ee1af76 JA |
512 | struct mid_q_entry *midQ; |
513 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 514 | |
133672ef SF |
515 | long_op = flags & CIFS_TIMEOUT_MASK; |
516 | ||
7ee1af76 JA |
517 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
518 | ||
519 | if ((ses == NULL) || (ses->server == NULL)) { | |
520 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 521 | cERROR(1, "Null session"); |
7ee1af76 JA |
522 | return -EIO; |
523 | } | |
524 | ||
79a58d1f | 525 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
526 | cifs_small_buf_release(in_buf); |
527 | return -ENOENT; | |
528 | } | |
529 | ||
79a58d1f | 530 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
531 | to the same server. We may make this configurable later or |
532 | use ses->maxReq */ | |
533 | ||
c5797a94 | 534 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
535 | if (rc) { |
536 | cifs_small_buf_release(in_buf); | |
537 | return rc; | |
538 | } | |
539 | ||
79a58d1f | 540 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
541 | and avoid races inside tcp sendmsg code that could cause corruption |
542 | of smb data */ | |
543 | ||
72ca545b | 544 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
545 | |
546 | rc = allocate_mid(ses, in_buf, &midQ); | |
547 | if (rc) { | |
72ca545b | 548 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 549 | cifs_small_buf_release(in_buf); |
7ee1af76 | 550 | /* Update # of requests on wire to server */ |
79a58d1f | 551 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
552 | wake_up(&ses->server->request_q); |
553 | return rc; | |
1da177e4 | 554 | } |
79a58d1f | 555 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
556 | if (rc) { |
557 | mutex_unlock(&ses->server->srv_mutex); | |
558 | cifs_small_buf_release(in_buf); | |
559 | goto out; | |
560 | } | |
1da177e4 LT |
561 | |
562 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
563 | #ifdef CONFIG_CIFS_STATS2 |
564 | atomic_inc(&ses->server->inSend); | |
565 | #endif | |
0496e02d | 566 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
567 | #ifdef CONFIG_CIFS_STATS2 |
568 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 569 | midQ->when_sent = jiffies; |
131afd0b | 570 | #endif |
7ee1af76 | 571 | |
72ca545b | 572 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
573 | cifs_small_buf_release(in_buf); |
574 | ||
79a58d1f | 575 | if (rc < 0) |
7ee1af76 | 576 | goto out; |
4b8f930f | 577 | |
0ade640e | 578 | if (long_op == CIFS_ASYNC_OP) |
133672ef | 579 | goto out; |
d6e04ae6 | 580 | |
0ade640e JL |
581 | rc = wait_for_response(ses->server, midQ); |
582 | if (rc != 0) | |
583 | goto out; | |
d6e04ae6 | 584 | |
053d5034 JL |
585 | rc = sync_mid_result(midQ, ses->server); |
586 | if (rc != 0) { | |
79a58d1f | 587 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 588 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
589 | return rc; |
590 | } | |
50c2f753 | 591 | |
8e4f2e8a VL |
592 | receive_len = midQ->resp_buf->smb_buf_length; |
593 | ||
d6e04ae6 | 594 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
595 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
596 | receive_len, xid); | |
d6e04ae6 | 597 | rc = -EIO; |
2b2bdfba SF |
598 | goto out; |
599 | } | |
600 | ||
601 | /* rcvd frame is ok */ | |
602 | ||
603 | if (midQ->resp_buf && | |
604 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
605 | ||
606 | iov[0].iov_base = (char *)midQ->resp_buf; | |
607 | if (midQ->largeBuf) | |
608 | *pRespBufType = CIFS_LARGE_BUFFER; | |
609 | else | |
610 | *pRespBufType = CIFS_SMALL_BUFFER; | |
611 | iov[0].iov_len = receive_len + 4; | |
612 | ||
613 | dump_smb(midQ->resp_buf, 80); | |
614 | /* convert the length into a more usable form */ | |
615 | if ((receive_len > 24) && | |
616 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
617 | SECMODE_SIGN_ENABLED))) { | |
618 | rc = cifs_verify_signature(midQ->resp_buf, | |
21e73393 | 619 | ses->server, |
d6e04ae6 | 620 | midQ->sequence_number+1); |
2b2bdfba | 621 | if (rc) { |
b6b38f70 | 622 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 623 | /* BB FIXME add code to kill session */ |
d6e04ae6 | 624 | } |
d6e04ae6 | 625 | } |
2b2bdfba SF |
626 | |
627 | /* BB special case reconnect tid and uid here? */ | |
628 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
629 | flags & CIFS_LOG_ERROR); | |
630 | ||
631 | /* convert ByteCount if necessary */ | |
632 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
633 | /* do not count RFC1001 header */ + | |
634 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
635 | BCC(midQ->resp_buf) = | |
636 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
637 | if ((flags & CIFS_NO_RESP) == 0) | |
638 | midQ->resp_buf = NULL; /* mark it so buf will | |
639 | not be freed by | |
ddc8cf8f | 640 | delete_mid */ |
2b2bdfba SF |
641 | } else { |
642 | rc = -EIO; | |
b6b38f70 | 643 | cFYI(1, "Bad MID state?"); |
d6e04ae6 | 644 | } |
1da177e4 | 645 | |
7ee1af76 | 646 | out: |
ddc8cf8f | 647 | delete_mid(midQ); |
79a58d1f | 648 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 649 | wake_up(&ses->server->request_q); |
1da177e4 | 650 | |
d6e04ae6 SF |
651 | return rc; |
652 | } | |
1da177e4 LT |
653 | |
654 | int | |
655 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
656 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
657 | int *pbytes_returned, const int long_op) | |
658 | { | |
659 | int rc = 0; | |
660 | unsigned int receive_len; | |
1da177e4 LT |
661 | struct mid_q_entry *midQ; |
662 | ||
663 | if (ses == NULL) { | |
b6b38f70 | 664 | cERROR(1, "Null smb session"); |
1da177e4 LT |
665 | return -EIO; |
666 | } | |
79a58d1f | 667 | if (ses->server == NULL) { |
b6b38f70 | 668 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
669 | return -EIO; |
670 | } | |
671 | ||
79a58d1f | 672 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
673 | return -ENOENT; |
674 | ||
79a58d1f | 675 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
676 | to the same server. We may make this configurable later or |
677 | use ses->maxReq */ | |
1da177e4 | 678 | |
6d9c6d54 | 679 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
680 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
681 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
682 | return -EIO; |
683 | } | |
684 | ||
c5797a94 | 685 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
686 | if (rc) |
687 | return rc; | |
688 | ||
79a58d1f | 689 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
690 | and avoid races inside tcp sendmsg code that could cause corruption |
691 | of smb data */ | |
692 | ||
72ca545b | 693 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 694 | |
7ee1af76 JA |
695 | rc = allocate_mid(ses, in_buf, &midQ); |
696 | if (rc) { | |
72ca545b | 697 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 698 | /* Update # of requests on wire to server */ |
79a58d1f | 699 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
700 | wake_up(&ses->server->request_q); |
701 | return rc; | |
1da177e4 LT |
702 | } |
703 | ||
ad009ac9 | 704 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
705 | if (rc) { |
706 | mutex_unlock(&ses->server->srv_mutex); | |
707 | goto out; | |
708 | } | |
1da177e4 LT |
709 | |
710 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
711 | #ifdef CONFIG_CIFS_STATS2 |
712 | atomic_inc(&ses->server->inSend); | |
713 | #endif | |
0496e02d | 714 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
715 | #ifdef CONFIG_CIFS_STATS2 |
716 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 717 | midQ->when_sent = jiffies; |
131afd0b | 718 | #endif |
72ca545b | 719 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 720 | |
79a58d1f | 721 | if (rc < 0) |
7ee1af76 JA |
722 | goto out; |
723 | ||
0ade640e | 724 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 725 | goto out; |
1da177e4 | 726 | |
0ade640e JL |
727 | rc = wait_for_response(ses->server, midQ); |
728 | if (rc != 0) | |
729 | goto out; | |
1da177e4 | 730 | |
053d5034 JL |
731 | rc = sync_mid_result(midQ, ses->server); |
732 | if (rc != 0) { | |
79a58d1f | 733 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 734 | wake_up(&ses->server->request_q); |
1da177e4 LT |
735 | return rc; |
736 | } | |
50c2f753 | 737 | |
8e4f2e8a VL |
738 | receive_len = midQ->resp_buf->smb_buf_length; |
739 | ||
1da177e4 | 740 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
741 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
742 | receive_len, xid); | |
1da177e4 | 743 | rc = -EIO; |
2b2bdfba SF |
744 | goto out; |
745 | } | |
746 | ||
747 | /* rcvd frame is ok */ | |
748 | ||
749 | if (midQ->resp_buf && out_buf | |
750 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
751 | out_buf->smb_buf_length = receive_len; | |
752 | memcpy((char *)out_buf + 4, | |
753 | (char *)midQ->resp_buf + 4, | |
754 | receive_len); | |
755 | ||
756 | dump_smb(out_buf, 92); | |
757 | /* convert the length into a more usable form */ | |
758 | if ((receive_len > 24) && | |
759 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
760 | SECMODE_SIGN_ENABLED))) { | |
761 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 762 | ses->server, |
ad009ac9 | 763 | midQ->sequence_number+1); |
2b2bdfba | 764 | if (rc) { |
b6b38f70 | 765 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 766 | /* BB FIXME add code to kill session */ |
1da177e4 | 767 | } |
2b2bdfba | 768 | } |
1da177e4 | 769 | |
2b2bdfba | 770 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 771 | |
2b2bdfba SF |
772 | /* BB special case reconnect tid and uid here? */ |
773 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 774 | |
2b2bdfba SF |
775 | /* convert ByteCount if necessary */ |
776 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
777 | /* do not count RFC1001 header */ + | |
778 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
779 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
780 | } else { | |
781 | rc = -EIO; | |
b6b38f70 | 782 | cERROR(1, "Bad MID state?"); |
1da177e4 | 783 | } |
7ee1af76 JA |
784 | |
785 | out: | |
ddc8cf8f | 786 | delete_mid(midQ); |
79a58d1f | 787 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 788 | wake_up(&ses->server->request_q); |
1da177e4 | 789 | |
7ee1af76 JA |
790 | return rc; |
791 | } | |
1da177e4 | 792 | |
7ee1af76 JA |
793 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
794 | blocking lock to return. */ | |
795 | ||
796 | static int | |
797 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
798 | struct smb_hdr *in_buf, | |
799 | struct smb_hdr *out_buf) | |
800 | { | |
801 | int bytes_returned; | |
802 | struct cifsSesInfo *ses = tcon->ses; | |
803 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
804 | ||
805 | /* We just modify the current in_buf to change | |
806 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
807 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
808 | LOCKING_ANDX_CANCEL_LOCK. */ | |
809 | ||
810 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
811 | pSMB->Timeout = 0; | |
812 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
813 | ||
814 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 815 | &bytes_returned, 0); |
7ee1af76 JA |
816 | } |
817 | ||
818 | int | |
819 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
820 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
821 | int *pbytes_returned) | |
822 | { | |
823 | int rc = 0; | |
824 | int rstart = 0; | |
825 | unsigned int receive_len; | |
826 | struct mid_q_entry *midQ; | |
827 | struct cifsSesInfo *ses; | |
828 | ||
829 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 830 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
831 | return -EIO; |
832 | } | |
833 | ses = tcon->ses; | |
834 | ||
79a58d1f | 835 | if (ses->server == NULL) { |
b6b38f70 | 836 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
837 | return -EIO; |
838 | } | |
839 | ||
79a58d1f | 840 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
841 | return -ENOENT; |
842 | ||
79a58d1f | 843 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
844 | to the same server. We may make this configurable later or |
845 | use ses->maxReq */ | |
846 | ||
6d9c6d54 | 847 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
848 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
849 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
850 | return -EIO; |
851 | } | |
852 | ||
c5797a94 | 853 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
854 | if (rc) |
855 | return rc; | |
856 | ||
79a58d1f | 857 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
858 | and avoid races inside tcp sendmsg code that could cause corruption |
859 | of smb data */ | |
860 | ||
72ca545b | 861 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
862 | |
863 | rc = allocate_mid(ses, in_buf, &midQ); | |
864 | if (rc) { | |
72ca545b | 865 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
866 | return rc; |
867 | } | |
868 | ||
7ee1af76 | 869 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 870 | if (rc) { |
ddc8cf8f | 871 | delete_mid(midQ); |
829049cb VL |
872 | mutex_unlock(&ses->server->srv_mutex); |
873 | return rc; | |
874 | } | |
1da177e4 | 875 | |
7ee1af76 JA |
876 | midQ->midState = MID_REQUEST_SUBMITTED; |
877 | #ifdef CONFIG_CIFS_STATS2 | |
878 | atomic_inc(&ses->server->inSend); | |
879 | #endif | |
0496e02d | 880 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
881 | #ifdef CONFIG_CIFS_STATS2 |
882 | atomic_dec(&ses->server->inSend); | |
883 | midQ->when_sent = jiffies; | |
884 | #endif | |
72ca545b | 885 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 886 | |
79a58d1f | 887 | if (rc < 0) { |
ddc8cf8f | 888 | delete_mid(midQ); |
7ee1af76 JA |
889 | return rc; |
890 | } | |
891 | ||
892 | /* Wait for a reply - allow signals to interrupt. */ | |
893 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 894 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
895 | ((ses->server->tcpStatus != CifsGood) && |
896 | (ses->server->tcpStatus != CifsNew))); | |
897 | ||
898 | /* Were we interrupted by a signal ? */ | |
899 | if ((rc == -ERESTARTSYS) && | |
900 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
901 | ((ses->server->tcpStatus == CifsGood) || | |
902 | (ses->server->tcpStatus == CifsNew))) { | |
903 | ||
904 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
905 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
906 | blocking lock to return. */ | |
76dcc26f | 907 | rc = send_nt_cancel(ses->server, in_buf, midQ); |
7ee1af76 | 908 | if (rc) { |
ddc8cf8f | 909 | delete_mid(midQ); |
7ee1af76 JA |
910 | return rc; |
911 | } | |
912 | } else { | |
913 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
914 | to cause the blocking lock to return. */ | |
915 | ||
916 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
917 | ||
918 | /* If we get -ENOLCK back the lock may have | |
919 | already been removed. Don't exit in this case. */ | |
920 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 921 | delete_mid(midQ); |
7ee1af76 JA |
922 | return rc; |
923 | } | |
924 | } | |
925 | ||
0ade640e | 926 | if (wait_for_response(ses->server, midQ) == 0) { |
7ee1af76 JA |
927 | /* We got the response - restart system call. */ |
928 | rstart = 1; | |
929 | } | |
930 | } | |
931 | ||
053d5034 JL |
932 | rc = sync_mid_result(midQ, ses->server); |
933 | if (rc != 0) | |
7ee1af76 | 934 | return rc; |
50c2f753 | 935 | |
053d5034 | 936 | receive_len = midQ->resp_buf->smb_buf_length; |
7ee1af76 | 937 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
938 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
939 | receive_len, xid); | |
7ee1af76 | 940 | rc = -EIO; |
17c8bfed VL |
941 | goto out; |
942 | } | |
7ee1af76 | 943 | |
17c8bfed | 944 | /* rcvd frame is ok */ |
7ee1af76 | 945 | |
ac6a3ef4 | 946 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 | 947 | rc = -EIO; |
b6b38f70 | 948 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
949 | goto out; |
950 | } | |
1da177e4 | 951 | |
698e96a8 VL |
952 | out_buf->smb_buf_length = receive_len; |
953 | memcpy((char *)out_buf + 4, | |
954 | (char *)midQ->resp_buf + 4, | |
955 | receive_len); | |
956 | ||
957 | dump_smb(out_buf, 92); | |
958 | /* convert the length into a more usable form */ | |
959 | if ((receive_len > 24) && | |
960 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
961 | SECMODE_SIGN_ENABLED))) { | |
962 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 963 | ses->server, |
698e96a8 VL |
964 | midQ->sequence_number+1); |
965 | if (rc) { | |
b6b38f70 | 966 | cERROR(1, "Unexpected SMB signature"); |
698e96a8 | 967 | /* BB FIXME add code to kill session */ |
7ee1af76 | 968 | } |
698e96a8 | 969 | } |
17c8bfed | 970 | |
698e96a8 | 971 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 972 | |
698e96a8 VL |
973 | /* BB special case reconnect tid and uid here? */ |
974 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 975 | |
698e96a8 VL |
976 | /* convert ByteCount if necessary */ |
977 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
978 | /* do not count RFC1001 header */ + | |
979 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
980 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
981 | |
982 | out: | |
ddc8cf8f | 983 | delete_mid(midQ); |
7ee1af76 JA |
984 | if (rstart && rc == -EACCES) |
985 | return -ERESTARTSYS; | |
1da177e4 LT |
986 | return rc; |
987 | } |