Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/delay.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/processor.h> | |
30 | #include <linux/mempool.h> | |
31 | #include "cifspdu.h" | |
32 | #include "cifsglob.h" | |
33 | #include "cifsproto.h" | |
34 | #include "cifs_debug.h" | |
50c2f753 | 35 | |
1da177e4 | 36 | extern mempool_t *cifs_mid_poolp; |
e18b890b | 37 | extern struct kmem_cache *cifs_oplock_cachep; |
1da177e4 LT |
38 | |
39 | static struct mid_q_entry * | |
24b9b06b | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
24b9b06b | 44 | if (server == NULL) { |
1da177e4 LT |
45 | cERROR(1, ("Null TCP session in AllocMidQEntry")); |
46 | return NULL; | |
47 | } | |
50c2f753 | 48 | |
232087cb | 49 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
50 | if (temp == NULL) |
51 | return temp; | |
52 | else { | |
26f57364 | 53 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
54 | temp->mid = smb_buffer->Mid; /* always LE */ |
55 | temp->pid = current->pid; | |
56 | temp->command = smb_buffer->Command; | |
57 | cFYI(1, ("For smb_command %d", temp->command)); | |
1047abc1 SF |
58 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
59 | /* when mid allocated can be before when sent */ | |
60 | temp->when_alloc = jiffies; | |
1da177e4 LT |
61 | temp->tsk = current; |
62 | } | |
63 | ||
64 | spin_lock(&GlobalMid_Lock); | |
24b9b06b | 65 | list_add_tail(&temp->qhead, &server->pending_mid_q); |
1da177e4 LT |
66 | atomic_inc(&midCount); |
67 | temp->midState = MID_REQUEST_ALLOCATED; | |
68 | spin_unlock(&GlobalMid_Lock); | |
69 | return temp; | |
70 | } | |
71 | ||
72 | static void | |
73 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
74 | { | |
1047abc1 SF |
75 | #ifdef CONFIG_CIFS_STATS2 |
76 | unsigned long now; | |
77 | #endif | |
1da177e4 LT |
78 | spin_lock(&GlobalMid_Lock); |
79 | midEntry->midState = MID_FREE; | |
80 | list_del(&midEntry->qhead); | |
81 | atomic_dec(&midCount); | |
82 | spin_unlock(&GlobalMid_Lock); | |
79a58d1f | 83 | if (midEntry->largeBuf) |
b8643e1b SF |
84 | cifs_buf_release(midEntry->resp_buf); |
85 | else | |
86 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
87 | #ifdef CONFIG_CIFS_STATS2 |
88 | now = jiffies; | |
89 | /* commands taking longer than one second are indications that | |
90 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
91 | if ((now - midEntry->when_alloc) > HZ) { |
92 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
93 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
94 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
95 | midEntry->command, midEntry->mid); | |
96 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
97 | now - midEntry->when_alloc, | |
98 | now - midEntry->when_sent, | |
99 | now - midEntry->when_received); | |
100 | } | |
101 | } | |
102 | #endif | |
1da177e4 LT |
103 | mempool_free(midEntry, cifs_mid_poolp); |
104 | } | |
105 | ||
106 | struct oplock_q_entry * | |
79a58d1f | 107 | AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
1da177e4 LT |
108 | { |
109 | struct oplock_q_entry *temp; | |
79a58d1f | 110 | if ((pinode == NULL) || (tcon == NULL)) { |
1da177e4 LT |
111 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
112 | return NULL; | |
113 | } | |
114 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, | |
e94b1766 | 115 | GFP_KERNEL); |
1da177e4 LT |
116 | if (temp == NULL) |
117 | return temp; | |
118 | else { | |
119 | temp->pinode = pinode; | |
120 | temp->tcon = tcon; | |
121 | temp->netfid = fid; | |
122 | spin_lock(&GlobalMid_Lock); | |
123 | list_add_tail(&temp->qhead, &GlobalOplock_Q); | |
124 | spin_unlock(&GlobalMid_Lock); | |
125 | } | |
126 | return temp; | |
127 | ||
128 | } | |
129 | ||
79a58d1f | 130 | void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
1da177e4 | 131 | { |
79a58d1f | 132 | spin_lock(&GlobalMid_Lock); |
1da177e4 LT |
133 | /* should we check if list empty first? */ |
134 | list_del(&oplockEntry->qhead); | |
135 | spin_unlock(&GlobalMid_Lock); | |
136 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); | |
137 | } | |
138 | ||
5d941ca6 SF |
139 | |
140 | void DeleteTconOplockQEntries(struct cifsTconInfo *tcon) | |
141 | { | |
142 | struct oplock_q_entry *temp; | |
143 | ||
144 | if (tcon == NULL) | |
145 | return; | |
146 | ||
147 | spin_lock(&GlobalMid_Lock); | |
148 | list_for_each_entry(temp, &GlobalOplock_Q, qhead) { | |
149 | if ((temp->tcon) && (temp->tcon == tcon)) { | |
150 | list_del(&temp->qhead); | |
151 | kmem_cache_free(cifs_oplock_cachep, temp); | |
152 | } | |
153 | } | |
154 | spin_unlock(&GlobalMid_Lock); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | int |
158 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
edf1ae40 | 159 | unsigned int smb_buf_length, struct sockaddr *sin, bool noblocksnd) |
1da177e4 LT |
160 | { |
161 | int rc = 0; | |
162 | int i = 0; | |
163 | struct msghdr smb_msg; | |
164 | struct kvec iov; | |
165 | unsigned len = smb_buf_length + 4; | |
166 | ||
79a58d1f | 167 | if (ssocket == NULL) |
1da177e4 LT |
168 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
169 | iov.iov_base = smb_buffer; | |
170 | iov.iov_len = len; | |
171 | ||
172 | smb_msg.msg_name = sin; | |
26f57364 | 173 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
174 | smb_msg.msg_control = NULL; |
175 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
176 | if (noblocksnd) |
177 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
178 | else | |
179 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
180 | |
181 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
182 | area, and byte area if necessary, is converted to littleendian in |
183 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
184 | Flags2 is converted in SendReceive */ |
185 | ||
186 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); | |
3e84469d | 187 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
1da177e4 LT |
188 | dump_smb(smb_buffer, len); |
189 | ||
190 | while (len > 0) { | |
191 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
192 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
193 | i++; | |
3e84469d | 194 | /* smaller timeout here than send2 since smaller size */ |
79a58d1f SF |
195 | /* Although it may not be required, this also is smaller |
196 | oplock break time */ | |
197 | if (i > 12) { | |
1da177e4 | 198 | cERROR(1, |
68058e75 | 199 | ("sends on sock %p stuck for 7 seconds", |
1da177e4 LT |
200 | ssocket)); |
201 | rc = -EAGAIN; | |
202 | break; | |
203 | } | |
68058e75 | 204 | msleep(1 << i); |
1da177e4 LT |
205 | continue; |
206 | } | |
79a58d1f | 207 | if (rc < 0) |
1da177e4 | 208 | break; |
5e1253b5 SF |
209 | else |
210 | i = 0; /* reset i after each successful send */ | |
1da177e4 LT |
211 | iov.iov_base += rc; |
212 | iov.iov_len -= rc; | |
213 | len -= rc; | |
214 | } | |
215 | ||
216 | if (rc < 0) { | |
79a58d1f | 217 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
1da177e4 LT |
218 | } else { |
219 | rc = 0; | |
220 | } | |
221 | ||
7ee1af76 JA |
222 | /* Don't want to modify the buffer as a |
223 | side effect of this call. */ | |
224 | smb_buffer->smb_buf_length = smb_buf_length; | |
225 | ||
1da177e4 LT |
226 | return rc; |
227 | } | |
228 | ||
d6e04ae6 | 229 | static int |
edf1ae40 SF |
230 | smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec, |
231 | struct sockaddr *sin, bool noblocksnd) | |
1da177e4 LT |
232 | { |
233 | int rc = 0; | |
234 | int i = 0; | |
235 | struct msghdr smb_msg; | |
3e84469d SF |
236 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
237 | unsigned int len = iov[0].iov_len; | |
238 | unsigned int total_len; | |
239 | int first_vec = 0; | |
7ee1af76 | 240 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 241 | struct socket *ssocket = server->ssocket; |
50c2f753 | 242 | |
79a58d1f | 243 | if (ssocket == NULL) |
1da177e4 | 244 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 245 | |
1da177e4 | 246 | smb_msg.msg_name = sin; |
26f57364 | 247 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
248 | smb_msg.msg_control = NULL; |
249 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
250 | if (noblocksnd) |
251 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
252 | else | |
253 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
254 | |
255 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
256 | area, and byte area if necessary, is converted to littleendian in |
257 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
258 | Flags2 is converted in SendReceive */ |
259 | ||
3e84469d SF |
260 | |
261 | total_len = 0; | |
262 | for (i = 0; i < n_vec; i++) | |
263 | total_len += iov[i].iov_len; | |
264 | ||
1da177e4 | 265 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 266 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
267 | dump_smb(smb_buffer, len); |
268 | ||
17680356 | 269 | i = 0; |
3e84469d SF |
270 | while (total_len) { |
271 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
272 | n_vec - first_vec, total_len); | |
1da177e4 LT |
273 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
274 | i++; | |
79a58d1f | 275 | if (i >= 14) { |
1da177e4 | 276 | cERROR(1, |
68058e75 | 277 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
278 | ssocket)); |
279 | rc = -EAGAIN; | |
280 | break; | |
281 | } | |
68058e75 | 282 | msleep(1 << i); |
1da177e4 LT |
283 | continue; |
284 | } | |
79a58d1f | 285 | if (rc < 0) |
1da177e4 | 286 | break; |
3e84469d | 287 | |
61de800d SF |
288 | if (rc == total_len) { |
289 | total_len = 0; | |
290 | break; | |
291 | } else if (rc > total_len) { | |
292 | cERROR(1, ("sent %d requested %d", rc, total_len)); | |
3e84469d SF |
293 | break; |
294 | } | |
79a58d1f | 295 | if (rc == 0) { |
3e84469d SF |
296 | /* should never happen, letting socket clear before |
297 | retrying is our only obvious option here */ | |
79a58d1f | 298 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
299 | msleep(500); |
300 | continue; | |
d6e04ae6 | 301 | } |
3e84469d | 302 | total_len -= rc; |
68058e75 | 303 | /* the line below resets i */ |
3e84469d SF |
304 | for (i = first_vec; i < n_vec; i++) { |
305 | if (iov[i].iov_len) { | |
306 | if (rc > iov[i].iov_len) { | |
307 | rc -= iov[i].iov_len; | |
308 | iov[i].iov_len = 0; | |
309 | } else { | |
310 | iov[i].iov_base += rc; | |
311 | iov[i].iov_len -= rc; | |
312 | first_vec = i; | |
313 | break; | |
314 | } | |
315 | } | |
d6e04ae6 | 316 | } |
5e1253b5 | 317 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
318 | } |
319 | ||
edf1ae40 SF |
320 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
321 | cFYI(1, ("partial send (%d remaining), terminating session", | |
322 | total_len)); | |
323 | /* If we have only sent part of an SMB then the next SMB | |
324 | could be taken as the remainder of this one. We need | |
325 | to kill the socket so the server throws away the partial | |
326 | SMB */ | |
327 | server->tcpStatus = CifsNeedReconnect; | |
328 | } | |
329 | ||
1da177e4 | 330 | if (rc < 0) { |
79a58d1f | 331 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 332 | } else |
1da177e4 | 333 | rc = 0; |
1da177e4 | 334 | |
7ee1af76 JA |
335 | /* Don't want to modify the buffer as a |
336 | side effect of this call. */ | |
337 | smb_buffer->smb_buf_length = smb_buf_length; | |
338 | ||
1da177e4 LT |
339 | return rc; |
340 | } | |
341 | ||
7ee1af76 | 342 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 343 | { |
133672ef | 344 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
345 | /* oplock breaks must not be held up */ |
346 | atomic_inc(&ses->server->inFlight); | |
347 | } else { | |
79a58d1f SF |
348 | spin_lock(&GlobalMid_Lock); |
349 | while (1) { | |
350 | if (atomic_read(&ses->server->inFlight) >= | |
d6e04ae6 | 351 | cifs_max_pending){ |
1da177e4 | 352 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
353 | #ifdef CONFIG_CIFS_STATS2 |
354 | atomic_inc(&ses->server->num_waiters); | |
355 | #endif | |
1da177e4 LT |
356 | wait_event(ses->server->request_q, |
357 | atomic_read(&ses->server->inFlight) | |
358 | < cifs_max_pending); | |
131afd0b SF |
359 | #ifdef CONFIG_CIFS_STATS2 |
360 | atomic_dec(&ses->server->num_waiters); | |
361 | #endif | |
1da177e4 LT |
362 | spin_lock(&GlobalMid_Lock); |
363 | } else { | |
79a58d1f | 364 | if (ses->server->tcpStatus == CifsExiting) { |
1da177e4 LT |
365 | spin_unlock(&GlobalMid_Lock); |
366 | return -ENOENT; | |
367 | } | |
368 | ||
79a58d1f SF |
369 | /* can not count locking commands against total |
370 | as they are allowed to block on server */ | |
50c2f753 | 371 | |
1da177e4 | 372 | /* update # of requests on the wire to server */ |
133672ef | 373 | if (long_op != CIFS_BLOCKING_OP) |
1da177e4 | 374 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
375 | spin_unlock(&GlobalMid_Lock); |
376 | break; | |
377 | } | |
378 | } | |
379 | } | |
7ee1af76 JA |
380 | return 0; |
381 | } | |
1da177e4 | 382 | |
7ee1af76 JA |
383 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
384 | struct mid_q_entry **ppmidQ) | |
385 | { | |
1da177e4 | 386 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 387 | return -ENOENT; |
8fbbd365 VL |
388 | } |
389 | ||
390 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
79a58d1f | 391 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 392 | return -EAGAIN; |
8fbbd365 VL |
393 | } |
394 | ||
395 | if (ses->status != CifsGood) { | |
1da177e4 | 396 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 397 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 398 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 399 | return -EAGAIN; |
ad7a2926 | 400 | /* else ok - we are setting up session */ |
1da177e4 | 401 | } |
24b9b06b | 402 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 403 | if (*ppmidQ == NULL) |
7ee1af76 | 404 | return -ENOMEM; |
7ee1af76 JA |
405 | return 0; |
406 | } | |
407 | ||
79a58d1f | 408 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
409 | struct mid_q_entry *midQ, |
410 | unsigned long timeout, | |
411 | unsigned long time_to_wait) | |
412 | { | |
413 | unsigned long curr_timeout; | |
414 | ||
415 | for (;;) { | |
416 | curr_timeout = timeout + jiffies; | |
85705524 JL |
417 | wait_event_timeout(ses->server->response_q, |
418 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); | |
7ee1af76 JA |
419 | |
420 | if (time_after(jiffies, curr_timeout) && | |
421 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
422 | ((ses->server->tcpStatus == CifsGood) || | |
423 | (ses->server->tcpStatus == CifsNew))) { | |
424 | ||
425 | unsigned long lrt; | |
426 | ||
427 | /* We timed out. Is the server still | |
428 | sending replies ? */ | |
429 | spin_lock(&GlobalMid_Lock); | |
430 | lrt = ses->server->lstrp; | |
431 | spin_unlock(&GlobalMid_Lock); | |
432 | ||
433 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 434 | Although we prefer not to time out if the |
7ee1af76 | 435 | server is still responding - we will time |
79a58d1f | 436 | out if the server takes more than 15 (or 45 |
7ee1af76 | 437 | or 180) seconds to respond to this request |
79a58d1f | 438 | and has not responded to any request from |
7ee1af76 JA |
439 | other threads on the client within 10 seconds */ |
440 | lrt += time_to_wait; | |
441 | if (time_after(jiffies, lrt)) { | |
442 | /* No replies for time_to_wait. */ | |
79a58d1f | 443 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
444 | return -1; |
445 | } | |
446 | } else { | |
447 | return 0; | |
448 | } | |
449 | } | |
450 | } | |
451 | ||
133672ef SF |
452 | |
453 | /* | |
454 | * | |
455 | * Send an SMB Request. No response info (other than return code) | |
456 | * needs to be parsed. | |
457 | * | |
458 | * flags indicate the type of request buffer and how long to wait | |
459 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
460 | * | |
461 | */ | |
462 | int | |
463 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
464 | struct smb_hdr *in_buf, int flags) | |
465 | { | |
466 | int rc; | |
467 | struct kvec iov[1]; | |
468 | int resp_buf_type; | |
469 | ||
470 | iov[0].iov_base = (char *)in_buf; | |
471 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
472 | flags |= CIFS_NO_RESP; | |
473 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
474 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
475 | ||
133672ef SF |
476 | return rc; |
477 | } | |
478 | ||
7ee1af76 | 479 | int |
79a58d1f SF |
480 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
481 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 482 | const int flags) |
7ee1af76 JA |
483 | { |
484 | int rc = 0; | |
133672ef | 485 | int long_op; |
7ee1af76 JA |
486 | unsigned int receive_len; |
487 | unsigned long timeout; | |
488 | struct mid_q_entry *midQ; | |
489 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 490 | |
133672ef SF |
491 | long_op = flags & CIFS_TIMEOUT_MASK; |
492 | ||
7ee1af76 JA |
493 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
494 | ||
495 | if ((ses == NULL) || (ses->server == NULL)) { | |
496 | cifs_small_buf_release(in_buf); | |
79a58d1f | 497 | cERROR(1, ("Null session")); |
7ee1af76 JA |
498 | return -EIO; |
499 | } | |
500 | ||
79a58d1f | 501 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
502 | cifs_small_buf_release(in_buf); |
503 | return -ENOENT; | |
504 | } | |
505 | ||
79a58d1f | 506 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
507 | to the same server. We may make this configurable later or |
508 | use ses->maxReq */ | |
509 | ||
510 | rc = wait_for_free_request(ses, long_op); | |
511 | if (rc) { | |
512 | cifs_small_buf_release(in_buf); | |
513 | return rc; | |
514 | } | |
515 | ||
79a58d1f | 516 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
517 | and avoid races inside tcp sendmsg code that could cause corruption |
518 | of smb data */ | |
519 | ||
72ca545b | 520 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
521 | |
522 | rc = allocate_mid(ses, in_buf, &midQ); | |
523 | if (rc) { | |
72ca545b | 524 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 525 | cifs_small_buf_release(in_buf); |
7ee1af76 | 526 | /* Update # of requests on wire to server */ |
79a58d1f | 527 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
528 | wake_up(&ses->server->request_q); |
529 | return rc; | |
1da177e4 | 530 | } |
79a58d1f | 531 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
532 | |
533 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
534 | #ifdef CONFIG_CIFS_STATS2 |
535 | atomic_inc(&ses->server->inSend); | |
536 | #endif | |
edf1ae40 SF |
537 | rc = smb_send2(ses->server, iov, n_vec, |
538 | (struct sockaddr *) &(ses->server->addr.sockAddr), | |
539 | ses->server->noblocksnd); | |
131afd0b SF |
540 | #ifdef CONFIG_CIFS_STATS2 |
541 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 542 | midQ->when_sent = jiffies; |
131afd0b | 543 | #endif |
7ee1af76 | 544 | |
72ca545b | 545 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
546 | cifs_small_buf_release(in_buf); |
547 | ||
79a58d1f | 548 | if (rc < 0) |
7ee1af76 | 549 | goto out; |
4b8f930f | 550 | |
133672ef SF |
551 | if (long_op == CIFS_STD_OP) |
552 | timeout = 15 * HZ; | |
553 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 554 | timeout = 180 * HZ; |
133672ef | 555 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 556 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 557 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
558 | else if (long_op == CIFS_ASYNC_OP) |
559 | goto out; | |
560 | else if (long_op == CIFS_BLOCKING_OP) | |
561 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
562 | else { | |
563 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
564 | rc = -EIO; | |
565 | goto out; | |
566 | } | |
7ee1af76 | 567 | |
79a58d1f | 568 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
569 | due to last connection to this server being unmounted */ |
570 | if (signal_pending(current)) { | |
571 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 572 | but we still give response a chance to complete */ |
d6e04ae6 | 573 | timeout = 2 * HZ; |
79a58d1f | 574 | } |
d6e04ae6 SF |
575 | |
576 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 577 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
578 | |
579 | spin_lock(&GlobalMid_Lock); | |
580 | if (midQ->resp_buf) { | |
581 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 582 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 583 | } else { |
79a58d1f | 584 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 585 | midQ->command, midQ->mid)); |
79a58d1f SF |
586 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
587 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
588 | rc = -EHOSTDOWN; |
589 | else { | |
590 | ses->server->tcpStatus = CifsNeedReconnect; | |
591 | midQ->midState = MID_RETRY_NEEDED; | |
592 | } | |
593 | } | |
594 | ||
595 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 596 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 597 | rc = -EAGAIN; |
79a58d1f | 598 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
599 | } else { |
600 | rc = -EIO; | |
601 | } | |
602 | } | |
603 | spin_unlock(&GlobalMid_Lock); | |
604 | DeleteMidQEntry(midQ); | |
7ee1af76 | 605 | /* Update # of requests on wire to server */ |
79a58d1f | 606 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 607 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
608 | return rc; |
609 | } | |
50c2f753 | 610 | |
d6e04ae6 SF |
611 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
612 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
613 | receive_len, xid)); | |
614 | rc = -EIO; | |
615 | } else { /* rcvd frame is ok */ | |
79a58d1f | 616 | if (midQ->resp_buf && |
d6e04ae6 | 617 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
84afc29b | 618 | |
ec637e3f | 619 | iov[0].iov_base = (char *)midQ->resp_buf; |
79a58d1f | 620 | if (midQ->largeBuf) |
ec637e3f SF |
621 | *pRespBufType = CIFS_LARGE_BUFFER; |
622 | else | |
623 | *pRespBufType = CIFS_SMALL_BUFFER; | |
624 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 625 | |
ec637e3f | 626 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 | 627 | /* convert the length into a more usable form */ |
79a58d1f | 628 | if ((receive_len > 24) && |
d6e04ae6 SF |
629 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
630 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 631 | rc = cifs_verify_signature(midQ->resp_buf, |
b609f06a | 632 | &ses->server->mac_signing_key, |
d6e04ae6 | 633 | midQ->sequence_number+1); |
79a58d1f SF |
634 | if (rc) { |
635 | cERROR(1, ("Unexpected SMB signature")); | |
d6e04ae6 SF |
636 | /* BB FIXME add code to kill session */ |
637 | } | |
638 | } | |
639 | ||
d6e04ae6 | 640 | /* BB special case reconnect tid and uid here? */ |
133672ef SF |
641 | rc = map_smb_to_linux_error(midQ->resp_buf, |
642 | flags & CIFS_LOG_ERROR); | |
d6e04ae6 SF |
643 | |
644 | /* convert ByteCount if necessary */ | |
26f57364 SF |
645 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
646 | /* do not count RFC1001 header */ + | |
ec637e3f | 647 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
79a58d1f | 648 | BCC(midQ->resp_buf) = |
ec637e3f | 649 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
133672ef SF |
650 | if ((flags & CIFS_NO_RESP) == 0) |
651 | midQ->resp_buf = NULL; /* mark it so buf will | |
652 | not be freed by | |
653 | DeleteMidQEntry */ | |
d6e04ae6 SF |
654 | } else { |
655 | rc = -EIO; | |
79a58d1f | 656 | cFYI(1, ("Bad MID state?")); |
d6e04ae6 SF |
657 | } |
658 | } | |
1da177e4 | 659 | |
7ee1af76 | 660 | out: |
7ee1af76 | 661 | DeleteMidQEntry(midQ); |
79a58d1f | 662 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 663 | wake_up(&ses->server->request_q); |
1da177e4 | 664 | |
d6e04ae6 SF |
665 | return rc; |
666 | } | |
1da177e4 LT |
667 | |
668 | int | |
669 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
670 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
671 | int *pbytes_returned, const int long_op) | |
672 | { | |
673 | int rc = 0; | |
674 | unsigned int receive_len; | |
675 | unsigned long timeout; | |
676 | struct mid_q_entry *midQ; | |
677 | ||
678 | if (ses == NULL) { | |
79a58d1f | 679 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
680 | return -EIO; |
681 | } | |
79a58d1f SF |
682 | if (ses->server == NULL) { |
683 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
684 | return -EIO; |
685 | } | |
686 | ||
79a58d1f | 687 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
688 | return -ENOENT; |
689 | ||
79a58d1f | 690 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
691 | to the same server. We may make this configurable later or |
692 | use ses->maxReq */ | |
1da177e4 | 693 | |
6d9c6d54 VL |
694 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
695 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
696 | in_buf->smb_buf_length)); | |
697 | return -EIO; | |
698 | } | |
699 | ||
7ee1af76 JA |
700 | rc = wait_for_free_request(ses, long_op); |
701 | if (rc) | |
702 | return rc; | |
703 | ||
79a58d1f | 704 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
705 | and avoid races inside tcp sendmsg code that could cause corruption |
706 | of smb data */ | |
707 | ||
72ca545b | 708 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 709 | |
7ee1af76 JA |
710 | rc = allocate_mid(ses, in_buf, &midQ); |
711 | if (rc) { | |
72ca545b | 712 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 713 | /* Update # of requests on wire to server */ |
79a58d1f | 714 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
715 | wake_up(&ses->server->request_q); |
716 | return rc; | |
1da177e4 LT |
717 | } |
718 | ||
ad009ac9 | 719 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
720 | |
721 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
722 | #ifdef CONFIG_CIFS_STATS2 |
723 | atomic_inc(&ses->server->inSend); | |
724 | #endif | |
1da177e4 | 725 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
edf1ae40 SF |
726 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
727 | ses->server->noblocksnd); | |
131afd0b SF |
728 | #ifdef CONFIG_CIFS_STATS2 |
729 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 730 | midQ->when_sent = jiffies; |
131afd0b | 731 | #endif |
72ca545b | 732 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 733 | |
79a58d1f | 734 | if (rc < 0) |
7ee1af76 JA |
735 | goto out; |
736 | ||
133672ef SF |
737 | if (long_op == CIFS_STD_OP) |
738 | timeout = 15 * HZ; | |
739 | /* wait for 15 seconds or until woken up due to response arriving or | |
740 | due to last connection to this server being unmounted */ | |
741 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 742 | goto out; |
133672ef | 743 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 744 | timeout = 180 * HZ; |
133672ef | 745 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 746 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 747 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
748 | else if (long_op == CIFS_BLOCKING_OP) |
749 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
750 | else { | |
751 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
752 | rc = -EIO; | |
753 | goto out; | |
754 | } | |
755 | ||
1da177e4 LT |
756 | if (signal_pending(current)) { |
757 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 758 | but we still give response a chance to complete */ |
1da177e4 | 759 | timeout = 2 * HZ; |
79a58d1f | 760 | } |
1da177e4 LT |
761 | |
762 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 763 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
764 | |
765 | spin_lock(&GlobalMid_Lock); | |
766 | if (midQ->resp_buf) { | |
767 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 768 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 769 | } else { |
79a58d1f | 770 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 771 | midQ->command, midQ->mid)); |
79a58d1f SF |
772 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
773 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
774 | rc = -EHOSTDOWN; |
775 | else { | |
776 | ses->server->tcpStatus = CifsNeedReconnect; | |
777 | midQ->midState = MID_RETRY_NEEDED; | |
778 | } | |
779 | } | |
780 | ||
781 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 782 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 783 | rc = -EAGAIN; |
79a58d1f | 784 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
785 | } else { |
786 | rc = -EIO; | |
787 | } | |
788 | } | |
789 | spin_unlock(&GlobalMid_Lock); | |
790 | DeleteMidQEntry(midQ); | |
7ee1af76 | 791 | /* Update # of requests on wire to server */ |
79a58d1f | 792 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 793 | wake_up(&ses->server->request_q); |
1da177e4 LT |
794 | return rc; |
795 | } | |
50c2f753 | 796 | |
1da177e4 | 797 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 798 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
799 | receive_len, xid)); |
800 | rc = -EIO; | |
801 | } else { /* rcvd frame is ok */ | |
802 | ||
803 | if (midQ->resp_buf && out_buf | |
804 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
805 | out_buf->smb_buf_length = receive_len; | |
806 | memcpy((char *)out_buf + 4, | |
807 | (char *)midQ->resp_buf + 4, | |
808 | receive_len); | |
809 | ||
810 | dump_smb(out_buf, 92); | |
811 | /* convert the length into a more usable form */ | |
79a58d1f | 812 | if ((receive_len > 24) && |
ad009ac9 SF |
813 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
814 | SECMODE_SIGN_ENABLED))) { | |
815 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 816 | &ses->server->mac_signing_key, |
ad009ac9 | 817 | midQ->sequence_number+1); |
79a58d1f SF |
818 | if (rc) { |
819 | cERROR(1, ("Unexpected SMB signature")); | |
275cde1a | 820 | /* BB FIXME add code to kill session */ |
ad009ac9 | 821 | } |
1da177e4 LT |
822 | } |
823 | ||
824 | *pbytes_returned = out_buf->smb_buf_length; | |
825 | ||
ad009ac9 | 826 | /* BB special case reconnect tid and uid here? */ |
a761ac57 | 827 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 LT |
828 | |
829 | /* convert ByteCount if necessary */ | |
26f57364 SF |
830 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
831 | /* do not count RFC1001 header */ + | |
1da177e4 | 832 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
0f2b27c4 | 833 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
834 | } else { |
835 | rc = -EIO; | |
79a58d1f | 836 | cERROR(1, ("Bad MID state?")); |
1da177e4 LT |
837 | } |
838 | } | |
7ee1af76 JA |
839 | |
840 | out: | |
1da177e4 | 841 | DeleteMidQEntry(midQ); |
79a58d1f | 842 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 843 | wake_up(&ses->server->request_q); |
1da177e4 | 844 | |
7ee1af76 JA |
845 | return rc; |
846 | } | |
1da177e4 | 847 | |
7ee1af76 JA |
848 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
849 | ||
850 | static int | |
851 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
852 | struct mid_q_entry *midQ) | |
853 | { | |
854 | int rc = 0; | |
855 | struct cifsSesInfo *ses = tcon->ses; | |
856 | __u16 mid = in_buf->Mid; | |
857 | ||
858 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
859 | in_buf->Mid = mid; | |
72ca545b | 860 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
861 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
862 | if (rc) { | |
72ca545b | 863 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
864 | return rc; |
865 | } | |
866 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
867 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
868 | ses->server->noblocksnd); | |
72ca545b | 869 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 870 | return rc; |
7ee1af76 JA |
871 | } |
872 | ||
873 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
874 | blocking lock to return. */ | |
875 | ||
876 | static int | |
877 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
878 | struct smb_hdr *in_buf, | |
879 | struct smb_hdr *out_buf) | |
880 | { | |
881 | int bytes_returned; | |
882 | struct cifsSesInfo *ses = tcon->ses; | |
883 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
884 | ||
885 | /* We just modify the current in_buf to change | |
886 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
887 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
888 | LOCKING_ANDX_CANCEL_LOCK. */ | |
889 | ||
890 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
891 | pSMB->Timeout = 0; | |
892 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
893 | ||
894 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 895 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
896 | } |
897 | ||
898 | int | |
899 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
900 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
901 | int *pbytes_returned) | |
902 | { | |
903 | int rc = 0; | |
904 | int rstart = 0; | |
905 | unsigned int receive_len; | |
906 | struct mid_q_entry *midQ; | |
907 | struct cifsSesInfo *ses; | |
908 | ||
909 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 910 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
911 | return -EIO; |
912 | } | |
913 | ses = tcon->ses; | |
914 | ||
79a58d1f SF |
915 | if (ses->server == NULL) { |
916 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
917 | return -EIO; |
918 | } | |
919 | ||
79a58d1f | 920 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
921 | return -ENOENT; |
922 | ||
79a58d1f | 923 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
924 | to the same server. We may make this configurable later or |
925 | use ses->maxReq */ | |
926 | ||
6d9c6d54 VL |
927 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
928 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
929 | in_buf->smb_buf_length)); | |
930 | return -EIO; | |
931 | } | |
932 | ||
133672ef | 933 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
934 | if (rc) |
935 | return rc; | |
936 | ||
79a58d1f | 937 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
938 | and avoid races inside tcp sendmsg code that could cause corruption |
939 | of smb data */ | |
940 | ||
72ca545b | 941 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
942 | |
943 | rc = allocate_mid(ses, in_buf, &midQ); | |
944 | if (rc) { | |
72ca545b | 945 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
946 | return rc; |
947 | } | |
948 | ||
7ee1af76 | 949 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 | 950 | |
7ee1af76 JA |
951 | midQ->midState = MID_REQUEST_SUBMITTED; |
952 | #ifdef CONFIG_CIFS_STATS2 | |
953 | atomic_inc(&ses->server->inSend); | |
954 | #endif | |
955 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
956 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
957 | ses->server->noblocksnd); | |
7ee1af76 JA |
958 | #ifdef CONFIG_CIFS_STATS2 |
959 | atomic_dec(&ses->server->inSend); | |
960 | midQ->when_sent = jiffies; | |
961 | #endif | |
72ca545b | 962 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 963 | |
79a58d1f | 964 | if (rc < 0) { |
7ee1af76 JA |
965 | DeleteMidQEntry(midQ); |
966 | return rc; | |
967 | } | |
968 | ||
969 | /* Wait for a reply - allow signals to interrupt. */ | |
970 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 971 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
972 | ((ses->server->tcpStatus != CifsGood) && |
973 | (ses->server->tcpStatus != CifsNew))); | |
974 | ||
975 | /* Were we interrupted by a signal ? */ | |
976 | if ((rc == -ERESTARTSYS) && | |
977 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
978 | ((ses->server->tcpStatus == CifsGood) || | |
979 | (ses->server->tcpStatus == CifsNew))) { | |
980 | ||
981 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
982 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
983 | blocking lock to return. */ | |
984 | ||
985 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
986 | if (rc) { | |
987 | DeleteMidQEntry(midQ); | |
988 | return rc; | |
989 | } | |
990 | } else { | |
991 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
992 | to cause the blocking lock to return. */ | |
993 | ||
994 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
995 | ||
996 | /* If we get -ENOLCK back the lock may have | |
997 | already been removed. Don't exit in this case. */ | |
998 | if (rc && rc != -ENOLCK) { | |
999 | DeleteMidQEntry(midQ); | |
1000 | return rc; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 1005 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
1006 | /* We got the response - restart system call. */ |
1007 | rstart = 1; | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | spin_lock(&GlobalMid_Lock); | |
1012 | if (midQ->resp_buf) { | |
1013 | spin_unlock(&GlobalMid_Lock); | |
1014 | receive_len = midQ->resp_buf->smb_buf_length; | |
1015 | } else { | |
79a58d1f | 1016 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 1017 | midQ->command, midQ->mid)); |
79a58d1f SF |
1018 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
1019 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
1020 | rc = -EHOSTDOWN; |
1021 | else { | |
1022 | ses->server->tcpStatus = CifsNeedReconnect; | |
1023 | midQ->midState = MID_RETRY_NEEDED; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 1028 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 1029 | rc = -EAGAIN; |
79a58d1f | 1030 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
1031 | } else { |
1032 | rc = -EIO; | |
1033 | } | |
1034 | } | |
1035 | spin_unlock(&GlobalMid_Lock); | |
1036 | DeleteMidQEntry(midQ); | |
1037 | return rc; | |
1da177e4 | 1038 | } |
50c2f753 | 1039 | |
7ee1af76 JA |
1040 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
1041 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
1042 | receive_len, xid)); | |
1043 | rc = -EIO; | |
1044 | } else { /* rcvd frame is ok */ | |
1045 | ||
1046 | if (midQ->resp_buf && out_buf | |
1047 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
1048 | out_buf->smb_buf_length = receive_len; | |
1049 | memcpy((char *)out_buf + 4, | |
1050 | (char *)midQ->resp_buf + 4, | |
1051 | receive_len); | |
1052 | ||
1053 | dump_smb(out_buf, 92); | |
1054 | /* convert the length into a more usable form */ | |
79a58d1f | 1055 | if ((receive_len > 24) && |
7ee1af76 JA |
1056 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
1057 | SECMODE_SIGN_ENABLED))) { | |
1058 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 1059 | &ses->server->mac_signing_key, |
7ee1af76 | 1060 | midQ->sequence_number+1); |
79a58d1f SF |
1061 | if (rc) { |
1062 | cERROR(1, ("Unexpected SMB signature")); | |
7ee1af76 JA |
1063 | /* BB FIXME add code to kill session */ |
1064 | } | |
1065 | } | |
1066 | ||
1067 | *pbytes_returned = out_buf->smb_buf_length; | |
1068 | ||
1069 | /* BB special case reconnect tid and uid here? */ | |
a761ac57 | 1070 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 | 1071 | |
7ee1af76 | 1072 | /* convert ByteCount if necessary */ |
26f57364 SF |
1073 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
1074 | /* do not count RFC1001 header */ + | |
7ee1af76 JA |
1075 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
1076 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1077 | } else { | |
1078 | rc = -EIO; | |
79a58d1f | 1079 | cERROR(1, ("Bad MID state?")); |
7ee1af76 JA |
1080 | } |
1081 | } | |
1082 | DeleteMidQEntry(midQ); | |
1083 | if (rstart && rc == -EACCES) | |
1084 | return -ERESTARTSYS; | |
1da177e4 LT |
1085 | return rc; |
1086 | } |