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 * | |
7ee1af76 | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
44 | if (ses == NULL) { | |
275cde1a | 45 | cERROR(1, ("Null session passed in to AllocMidQEntry")); |
1da177e4 LT |
46 | return NULL; |
47 | } | |
48 | if (ses->server == NULL) { | |
49 | cERROR(1, ("Null TCP session in AllocMidQEntry")); | |
50 | return NULL; | |
51 | } | |
50c2f753 | 52 | |
232087cb | 53 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
54 | if (temp == NULL) |
55 | return temp; | |
56 | else { | |
26f57364 | 57 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
58 | temp->mid = smb_buffer->Mid; /* always LE */ |
59 | temp->pid = current->pid; | |
60 | temp->command = smb_buffer->Command; | |
61 | cFYI(1, ("For smb_command %d", temp->command)); | |
1047abc1 SF |
62 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
63 | /* when mid allocated can be before when sent */ | |
64 | temp->when_alloc = jiffies; | |
1da177e4 LT |
65 | temp->ses = ses; |
66 | temp->tsk = current; | |
67 | } | |
68 | ||
69 | spin_lock(&GlobalMid_Lock); | |
70 | list_add_tail(&temp->qhead, &ses->server->pending_mid_q); | |
71 | atomic_inc(&midCount); | |
72 | temp->midState = MID_REQUEST_ALLOCATED; | |
73 | spin_unlock(&GlobalMid_Lock); | |
74 | return temp; | |
75 | } | |
76 | ||
77 | static void | |
78 | DeleteMidQEntry(struct mid_q_entry *midEntry) | |
79 | { | |
1047abc1 SF |
80 | #ifdef CONFIG_CIFS_STATS2 |
81 | unsigned long now; | |
82 | #endif | |
1da177e4 LT |
83 | spin_lock(&GlobalMid_Lock); |
84 | midEntry->midState = MID_FREE; | |
85 | list_del(&midEntry->qhead); | |
86 | atomic_dec(&midCount); | |
87 | spin_unlock(&GlobalMid_Lock); | |
79a58d1f | 88 | if (midEntry->largeBuf) |
b8643e1b SF |
89 | cifs_buf_release(midEntry->resp_buf); |
90 | else | |
91 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
92 | #ifdef CONFIG_CIFS_STATS2 |
93 | now = jiffies; | |
94 | /* commands taking longer than one second are indications that | |
95 | something is wrong, unless it is quite a slow link or server */ | |
79a58d1f SF |
96 | if ((now - midEntry->when_alloc) > HZ) { |
97 | if ((cifsFYI & CIFS_TIMER) && | |
1047abc1 SF |
98 | (midEntry->command != SMB_COM_LOCKING_ANDX)) { |
99 | printk(KERN_DEBUG " CIFS slow rsp: cmd %d mid %d", | |
100 | midEntry->command, midEntry->mid); | |
101 | printk(" A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
102 | now - midEntry->when_alloc, | |
103 | now - midEntry->when_sent, | |
104 | now - midEntry->when_received); | |
105 | } | |
106 | } | |
107 | #endif | |
1da177e4 LT |
108 | mempool_free(midEntry, cifs_mid_poolp); |
109 | } | |
110 | ||
111 | struct oplock_q_entry * | |
79a58d1f | 112 | AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) |
1da177e4 LT |
113 | { |
114 | struct oplock_q_entry *temp; | |
79a58d1f | 115 | if ((pinode == NULL) || (tcon == NULL)) { |
1da177e4 LT |
116 | cERROR(1, ("Null parms passed to AllocOplockQEntry")); |
117 | return NULL; | |
118 | } | |
119 | temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, | |
e94b1766 | 120 | GFP_KERNEL); |
1da177e4 LT |
121 | if (temp == NULL) |
122 | return temp; | |
123 | else { | |
124 | temp->pinode = pinode; | |
125 | temp->tcon = tcon; | |
126 | temp->netfid = fid; | |
127 | spin_lock(&GlobalMid_Lock); | |
128 | list_add_tail(&temp->qhead, &GlobalOplock_Q); | |
129 | spin_unlock(&GlobalMid_Lock); | |
130 | } | |
131 | return temp; | |
132 | ||
133 | } | |
134 | ||
79a58d1f | 135 | void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) |
1da177e4 | 136 | { |
79a58d1f | 137 | spin_lock(&GlobalMid_Lock); |
1da177e4 LT |
138 | /* should we check if list empty first? */ |
139 | list_del(&oplockEntry->qhead); | |
140 | spin_unlock(&GlobalMid_Lock); | |
141 | kmem_cache_free(cifs_oplock_cachep, oplockEntry); | |
142 | } | |
143 | ||
5d941ca6 SF |
144 | |
145 | void DeleteTconOplockQEntries(struct cifsTconInfo *tcon) | |
146 | { | |
147 | struct oplock_q_entry *temp; | |
148 | ||
149 | if (tcon == NULL) | |
150 | return; | |
151 | ||
152 | spin_lock(&GlobalMid_Lock); | |
153 | list_for_each_entry(temp, &GlobalOplock_Q, qhead) { | |
154 | if ((temp->tcon) && (temp->tcon == tcon)) { | |
155 | list_del(&temp->qhead); | |
156 | kmem_cache_free(cifs_oplock_cachep, temp); | |
157 | } | |
158 | } | |
159 | spin_unlock(&GlobalMid_Lock); | |
160 | } | |
161 | ||
1da177e4 LT |
162 | int |
163 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
edf1ae40 | 164 | unsigned int smb_buf_length, struct sockaddr *sin, bool noblocksnd) |
1da177e4 LT |
165 | { |
166 | int rc = 0; | |
167 | int i = 0; | |
168 | struct msghdr smb_msg; | |
169 | struct kvec iov; | |
170 | unsigned len = smb_buf_length + 4; | |
171 | ||
79a58d1f | 172 | if (ssocket == NULL) |
1da177e4 LT |
173 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
174 | iov.iov_base = smb_buffer; | |
175 | iov.iov_len = len; | |
176 | ||
177 | smb_msg.msg_name = sin; | |
26f57364 | 178 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
179 | smb_msg.msg_control = NULL; |
180 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
181 | if (noblocksnd) |
182 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
183 | else | |
184 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
185 | |
186 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
187 | area, and byte area if necessary, is converted to littleendian in |
188 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
189 | Flags2 is converted in SendReceive */ |
190 | ||
191 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); | |
3e84469d | 192 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
1da177e4 LT |
193 | dump_smb(smb_buffer, len); |
194 | ||
195 | while (len > 0) { | |
196 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
197 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
198 | i++; | |
3e84469d | 199 | /* smaller timeout here than send2 since smaller size */ |
79a58d1f SF |
200 | /* Although it may not be required, this also is smaller |
201 | oplock break time */ | |
202 | if (i > 12) { | |
1da177e4 | 203 | cERROR(1, |
68058e75 | 204 | ("sends on sock %p stuck for 7 seconds", |
1da177e4 LT |
205 | ssocket)); |
206 | rc = -EAGAIN; | |
207 | break; | |
208 | } | |
68058e75 | 209 | msleep(1 << i); |
1da177e4 LT |
210 | continue; |
211 | } | |
79a58d1f | 212 | if (rc < 0) |
1da177e4 | 213 | break; |
5e1253b5 SF |
214 | else |
215 | i = 0; /* reset i after each successful send */ | |
1da177e4 LT |
216 | iov.iov_base += rc; |
217 | iov.iov_len -= rc; | |
218 | len -= rc; | |
219 | } | |
220 | ||
221 | if (rc < 0) { | |
79a58d1f | 222 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
1da177e4 LT |
223 | } else { |
224 | rc = 0; | |
225 | } | |
226 | ||
7ee1af76 JA |
227 | /* Don't want to modify the buffer as a |
228 | side effect of this call. */ | |
229 | smb_buffer->smb_buf_length = smb_buf_length; | |
230 | ||
1da177e4 LT |
231 | return rc; |
232 | } | |
233 | ||
d6e04ae6 | 234 | static int |
edf1ae40 SF |
235 | smb_send2(struct TCP_Server_Info *server, struct kvec *iov, int n_vec, |
236 | struct sockaddr *sin, bool noblocksnd) | |
1da177e4 LT |
237 | { |
238 | int rc = 0; | |
239 | int i = 0; | |
240 | struct msghdr smb_msg; | |
3e84469d SF |
241 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
242 | unsigned int len = iov[0].iov_len; | |
243 | unsigned int total_len; | |
244 | int first_vec = 0; | |
7ee1af76 | 245 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 246 | struct socket *ssocket = server->ssocket; |
50c2f753 | 247 | |
79a58d1f | 248 | if (ssocket == NULL) |
1da177e4 | 249 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 250 | |
1da177e4 | 251 | smb_msg.msg_name = sin; |
26f57364 | 252 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
253 | smb_msg.msg_control = NULL; |
254 | smb_msg.msg_controllen = 0; | |
edf1ae40 SF |
255 | if (noblocksnd) |
256 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; | |
257 | else | |
258 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
259 | |
260 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
261 | area, and byte area if necessary, is converted to littleendian in |
262 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
263 | Flags2 is converted in SendReceive */ |
264 | ||
3e84469d SF |
265 | |
266 | total_len = 0; | |
267 | for (i = 0; i < n_vec; i++) | |
268 | total_len += iov[i].iov_len; | |
269 | ||
1da177e4 | 270 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 271 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
272 | dump_smb(smb_buffer, len); |
273 | ||
17680356 | 274 | i = 0; |
3e84469d SF |
275 | while (total_len) { |
276 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
277 | n_vec - first_vec, total_len); | |
1da177e4 LT |
278 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
279 | i++; | |
79a58d1f | 280 | if (i >= 14) { |
1da177e4 | 281 | cERROR(1, |
68058e75 | 282 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
283 | ssocket)); |
284 | rc = -EAGAIN; | |
285 | break; | |
286 | } | |
68058e75 | 287 | msleep(1 << i); |
1da177e4 LT |
288 | continue; |
289 | } | |
79a58d1f | 290 | if (rc < 0) |
1da177e4 | 291 | break; |
3e84469d | 292 | |
61de800d SF |
293 | if (rc == total_len) { |
294 | total_len = 0; | |
295 | break; | |
296 | } else if (rc > total_len) { | |
297 | cERROR(1, ("sent %d requested %d", rc, total_len)); | |
3e84469d SF |
298 | break; |
299 | } | |
79a58d1f | 300 | if (rc == 0) { |
3e84469d SF |
301 | /* should never happen, letting socket clear before |
302 | retrying is our only obvious option here */ | |
79a58d1f | 303 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
304 | msleep(500); |
305 | continue; | |
d6e04ae6 | 306 | } |
3e84469d | 307 | total_len -= rc; |
68058e75 | 308 | /* the line below resets i */ |
3e84469d SF |
309 | for (i = first_vec; i < n_vec; i++) { |
310 | if (iov[i].iov_len) { | |
311 | if (rc > iov[i].iov_len) { | |
312 | rc -= iov[i].iov_len; | |
313 | iov[i].iov_len = 0; | |
314 | } else { | |
315 | iov[i].iov_base += rc; | |
316 | iov[i].iov_len -= rc; | |
317 | first_vec = i; | |
318 | break; | |
319 | } | |
320 | } | |
d6e04ae6 | 321 | } |
5e1253b5 | 322 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
323 | } |
324 | ||
edf1ae40 SF |
325 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
326 | cFYI(1, ("partial send (%d remaining), terminating session", | |
327 | total_len)); | |
328 | /* If we have only sent part of an SMB then the next SMB | |
329 | could be taken as the remainder of this one. We need | |
330 | to kill the socket so the server throws away the partial | |
331 | SMB */ | |
332 | server->tcpStatus = CifsNeedReconnect; | |
333 | } | |
334 | ||
1da177e4 | 335 | if (rc < 0) { |
79a58d1f | 336 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 337 | } else |
1da177e4 | 338 | rc = 0; |
1da177e4 | 339 | |
7ee1af76 JA |
340 | /* Don't want to modify the buffer as a |
341 | side effect of this call. */ | |
342 | smb_buffer->smb_buf_length = smb_buf_length; | |
343 | ||
1da177e4 LT |
344 | return rc; |
345 | } | |
346 | ||
7ee1af76 | 347 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 348 | { |
133672ef | 349 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
350 | /* oplock breaks must not be held up */ |
351 | atomic_inc(&ses->server->inFlight); | |
352 | } else { | |
79a58d1f SF |
353 | spin_lock(&GlobalMid_Lock); |
354 | while (1) { | |
355 | if (atomic_read(&ses->server->inFlight) >= | |
d6e04ae6 | 356 | cifs_max_pending){ |
1da177e4 | 357 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
358 | #ifdef CONFIG_CIFS_STATS2 |
359 | atomic_inc(&ses->server->num_waiters); | |
360 | #endif | |
1da177e4 LT |
361 | wait_event(ses->server->request_q, |
362 | atomic_read(&ses->server->inFlight) | |
363 | < cifs_max_pending); | |
131afd0b SF |
364 | #ifdef CONFIG_CIFS_STATS2 |
365 | atomic_dec(&ses->server->num_waiters); | |
366 | #endif | |
1da177e4 LT |
367 | spin_lock(&GlobalMid_Lock); |
368 | } else { | |
79a58d1f | 369 | if (ses->server->tcpStatus == CifsExiting) { |
1da177e4 LT |
370 | spin_unlock(&GlobalMid_Lock); |
371 | return -ENOENT; | |
372 | } | |
373 | ||
79a58d1f SF |
374 | /* can not count locking commands against total |
375 | as they are allowed to block on server */ | |
50c2f753 | 376 | |
1da177e4 | 377 | /* update # of requests on the wire to server */ |
133672ef | 378 | if (long_op != CIFS_BLOCKING_OP) |
1da177e4 | 379 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
380 | spin_unlock(&GlobalMid_Lock); |
381 | break; | |
382 | } | |
383 | } | |
384 | } | |
7ee1af76 JA |
385 | return 0; |
386 | } | |
1da177e4 | 387 | |
7ee1af76 JA |
388 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
389 | struct mid_q_entry **ppmidQ) | |
390 | { | |
1da177e4 | 391 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 392 | return -ENOENT; |
1da177e4 | 393 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
79a58d1f | 394 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 395 | return -EAGAIN; |
1da177e4 LT |
396 | } else if (ses->status != CifsGood) { |
397 | /* check if SMB session is bad because we are setting it up */ | |
79a58d1f | 398 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 399 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 400 | return -EAGAIN; |
ad7a2926 | 401 | /* else ok - we are setting up session */ |
1da177e4 | 402 | } |
7ee1af76 | 403 | *ppmidQ = AllocMidQEntry(in_buf, ses); |
26f57364 | 404 | if (*ppmidQ == NULL) |
7ee1af76 | 405 | return -ENOMEM; |
7ee1af76 JA |
406 | return 0; |
407 | } | |
408 | ||
79a58d1f | 409 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
410 | struct mid_q_entry *midQ, |
411 | unsigned long timeout, | |
412 | unsigned long time_to_wait) | |
413 | { | |
414 | unsigned long curr_timeout; | |
415 | ||
416 | for (;;) { | |
417 | curr_timeout = timeout + jiffies; | |
418 | wait_event(ses->server->response_q, | |
79a58d1f SF |
419 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
420 | time_after(jiffies, curr_timeout) || | |
7ee1af76 JA |
421 | ((ses->server->tcpStatus != CifsGood) && |
422 | (ses->server->tcpStatus != CifsNew))); | |
423 | ||
424 | if (time_after(jiffies, curr_timeout) && | |
425 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
426 | ((ses->server->tcpStatus == CifsGood) || | |
427 | (ses->server->tcpStatus == CifsNew))) { | |
428 | ||
429 | unsigned long lrt; | |
430 | ||
431 | /* We timed out. Is the server still | |
432 | sending replies ? */ | |
433 | spin_lock(&GlobalMid_Lock); | |
434 | lrt = ses->server->lstrp; | |
435 | spin_unlock(&GlobalMid_Lock); | |
436 | ||
437 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 438 | Although we prefer not to time out if the |
7ee1af76 | 439 | server is still responding - we will time |
79a58d1f | 440 | out if the server takes more than 15 (or 45 |
7ee1af76 | 441 | or 180) seconds to respond to this request |
79a58d1f | 442 | and has not responded to any request from |
7ee1af76 JA |
443 | other threads on the client within 10 seconds */ |
444 | lrt += time_to_wait; | |
445 | if (time_after(jiffies, lrt)) { | |
446 | /* No replies for time_to_wait. */ | |
79a58d1f | 447 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
448 | return -1; |
449 | } | |
450 | } else { | |
451 | return 0; | |
452 | } | |
453 | } | |
454 | } | |
455 | ||
133672ef SF |
456 | |
457 | /* | |
458 | * | |
459 | * Send an SMB Request. No response info (other than return code) | |
460 | * needs to be parsed. | |
461 | * | |
462 | * flags indicate the type of request buffer and how long to wait | |
463 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
464 | * | |
465 | */ | |
466 | int | |
467 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
468 | struct smb_hdr *in_buf, int flags) | |
469 | { | |
470 | int rc; | |
471 | struct kvec iov[1]; | |
472 | int resp_buf_type; | |
473 | ||
474 | iov[0].iov_base = (char *)in_buf; | |
475 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
476 | flags |= CIFS_NO_RESP; | |
477 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
478 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
479 | ||
133672ef SF |
480 | return rc; |
481 | } | |
482 | ||
7ee1af76 | 483 | int |
79a58d1f SF |
484 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
485 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 486 | const int flags) |
7ee1af76 JA |
487 | { |
488 | int rc = 0; | |
133672ef | 489 | int long_op; |
7ee1af76 JA |
490 | unsigned int receive_len; |
491 | unsigned long timeout; | |
492 | struct mid_q_entry *midQ; | |
493 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 494 | |
133672ef SF |
495 | long_op = flags & CIFS_TIMEOUT_MASK; |
496 | ||
7ee1af76 JA |
497 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
498 | ||
499 | if ((ses == NULL) || (ses->server == NULL)) { | |
500 | cifs_small_buf_release(in_buf); | |
79a58d1f | 501 | cERROR(1, ("Null session")); |
7ee1af76 JA |
502 | return -EIO; |
503 | } | |
504 | ||
79a58d1f | 505 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
506 | cifs_small_buf_release(in_buf); |
507 | return -ENOENT; | |
508 | } | |
509 | ||
79a58d1f | 510 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
511 | to the same server. We may make this configurable later or |
512 | use ses->maxReq */ | |
513 | ||
514 | rc = wait_for_free_request(ses, long_op); | |
515 | if (rc) { | |
516 | cifs_small_buf_release(in_buf); | |
517 | return rc; | |
518 | } | |
519 | ||
79a58d1f | 520 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
521 | and avoid races inside tcp sendmsg code that could cause corruption |
522 | of smb data */ | |
523 | ||
79a58d1f | 524 | down(&ses->server->tcpSem); |
7ee1af76 JA |
525 | |
526 | rc = allocate_mid(ses, in_buf, &midQ); | |
527 | if (rc) { | |
1da177e4 | 528 | up(&ses->server->tcpSem); |
4b8f930f | 529 | cifs_small_buf_release(in_buf); |
7ee1af76 | 530 | /* Update # of requests on wire to server */ |
79a58d1f | 531 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
532 | wake_up(&ses->server->request_q); |
533 | return rc; | |
1da177e4 | 534 | } |
79a58d1f | 535 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
536 | |
537 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
538 | #ifdef CONFIG_CIFS_STATS2 |
539 | atomic_inc(&ses->server->inSend); | |
540 | #endif | |
edf1ae40 SF |
541 | rc = smb_send2(ses->server, iov, n_vec, |
542 | (struct sockaddr *) &(ses->server->addr.sockAddr), | |
543 | ses->server->noblocksnd); | |
131afd0b SF |
544 | #ifdef CONFIG_CIFS_STATS2 |
545 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 546 | midQ->when_sent = jiffies; |
131afd0b | 547 | #endif |
7ee1af76 JA |
548 | |
549 | up(&ses->server->tcpSem); | |
550 | cifs_small_buf_release(in_buf); | |
551 | ||
79a58d1f | 552 | if (rc < 0) |
7ee1af76 | 553 | goto out; |
4b8f930f | 554 | |
133672ef SF |
555 | if (long_op == CIFS_STD_OP) |
556 | timeout = 15 * HZ; | |
557 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 558 | timeout = 180 * HZ; |
133672ef | 559 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 560 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 561 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
562 | else if (long_op == CIFS_ASYNC_OP) |
563 | goto out; | |
564 | else if (long_op == CIFS_BLOCKING_OP) | |
565 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
566 | else { | |
567 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
568 | rc = -EIO; | |
569 | goto out; | |
570 | } | |
7ee1af76 | 571 | |
79a58d1f | 572 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
573 | due to last connection to this server being unmounted */ |
574 | if (signal_pending(current)) { | |
575 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 576 | but we still give response a chance to complete */ |
d6e04ae6 | 577 | timeout = 2 * HZ; |
79a58d1f | 578 | } |
d6e04ae6 SF |
579 | |
580 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 581 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
582 | |
583 | spin_lock(&GlobalMid_Lock); | |
584 | if (midQ->resp_buf) { | |
585 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 586 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 587 | } else { |
79a58d1f | 588 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 589 | midQ->command, midQ->mid)); |
79a58d1f SF |
590 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
591 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
592 | rc = -EHOSTDOWN; |
593 | else { | |
594 | ses->server->tcpStatus = CifsNeedReconnect; | |
595 | midQ->midState = MID_RETRY_NEEDED; | |
596 | } | |
597 | } | |
598 | ||
599 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 600 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 601 | rc = -EAGAIN; |
79a58d1f | 602 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
603 | } else { |
604 | rc = -EIO; | |
605 | } | |
606 | } | |
607 | spin_unlock(&GlobalMid_Lock); | |
608 | DeleteMidQEntry(midQ); | |
7ee1af76 | 609 | /* Update # of requests on wire to server */ |
79a58d1f | 610 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 611 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
612 | return rc; |
613 | } | |
50c2f753 | 614 | |
d6e04ae6 SF |
615 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
616 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
617 | receive_len, xid)); | |
618 | rc = -EIO; | |
619 | } else { /* rcvd frame is ok */ | |
79a58d1f | 620 | if (midQ->resp_buf && |
d6e04ae6 | 621 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
84afc29b | 622 | |
ec637e3f | 623 | iov[0].iov_base = (char *)midQ->resp_buf; |
79a58d1f | 624 | if (midQ->largeBuf) |
ec637e3f SF |
625 | *pRespBufType = CIFS_LARGE_BUFFER; |
626 | else | |
627 | *pRespBufType = CIFS_SMALL_BUFFER; | |
628 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 629 | |
ec637e3f | 630 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 | 631 | /* convert the length into a more usable form */ |
79a58d1f | 632 | if ((receive_len > 24) && |
d6e04ae6 SF |
633 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
634 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 635 | rc = cifs_verify_signature(midQ->resp_buf, |
b609f06a | 636 | &ses->server->mac_signing_key, |
d6e04ae6 | 637 | midQ->sequence_number+1); |
79a58d1f SF |
638 | if (rc) { |
639 | cERROR(1, ("Unexpected SMB signature")); | |
d6e04ae6 SF |
640 | /* BB FIXME add code to kill session */ |
641 | } | |
642 | } | |
643 | ||
d6e04ae6 | 644 | /* BB special case reconnect tid and uid here? */ |
133672ef SF |
645 | rc = map_smb_to_linux_error(midQ->resp_buf, |
646 | flags & CIFS_LOG_ERROR); | |
d6e04ae6 SF |
647 | |
648 | /* convert ByteCount if necessary */ | |
26f57364 SF |
649 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
650 | /* do not count RFC1001 header */ + | |
ec637e3f | 651 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
79a58d1f | 652 | BCC(midQ->resp_buf) = |
ec637e3f | 653 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
133672ef SF |
654 | if ((flags & CIFS_NO_RESP) == 0) |
655 | midQ->resp_buf = NULL; /* mark it so buf will | |
656 | not be freed by | |
657 | DeleteMidQEntry */ | |
d6e04ae6 SF |
658 | } else { |
659 | rc = -EIO; | |
79a58d1f | 660 | cFYI(1, ("Bad MID state?")); |
d6e04ae6 SF |
661 | } |
662 | } | |
1da177e4 | 663 | |
7ee1af76 | 664 | out: |
7ee1af76 | 665 | DeleteMidQEntry(midQ); |
79a58d1f | 666 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 667 | wake_up(&ses->server->request_q); |
1da177e4 | 668 | |
d6e04ae6 SF |
669 | return rc; |
670 | } | |
1da177e4 LT |
671 | |
672 | int | |
673 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
674 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
675 | int *pbytes_returned, const int long_op) | |
676 | { | |
677 | int rc = 0; | |
678 | unsigned int receive_len; | |
679 | unsigned long timeout; | |
680 | struct mid_q_entry *midQ; | |
681 | ||
682 | if (ses == NULL) { | |
79a58d1f | 683 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
684 | return -EIO; |
685 | } | |
79a58d1f SF |
686 | if (ses->server == NULL) { |
687 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
688 | return -EIO; |
689 | } | |
690 | ||
79a58d1f | 691 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
692 | return -ENOENT; |
693 | ||
79a58d1f | 694 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
695 | to the same server. We may make this configurable later or |
696 | use ses->maxReq */ | |
1da177e4 | 697 | |
7ee1af76 JA |
698 | rc = wait_for_free_request(ses, long_op); |
699 | if (rc) | |
700 | return rc; | |
701 | ||
79a58d1f | 702 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
703 | and avoid races inside tcp sendmsg code that could cause corruption |
704 | of smb data */ | |
705 | ||
79a58d1f | 706 | down(&ses->server->tcpSem); |
1da177e4 | 707 | |
7ee1af76 JA |
708 | rc = allocate_mid(ses, in_buf, &midQ); |
709 | if (rc) { | |
1da177e4 | 710 | up(&ses->server->tcpSem); |
7ee1af76 | 711 | /* Update # of requests on wire to server */ |
79a58d1f | 712 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
713 | wake_up(&ses->server->request_q); |
714 | return rc; | |
1da177e4 LT |
715 | } |
716 | ||
717 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
26a21b98 | 718 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
1da177e4 LT |
719 | in_buf->smb_buf_length)); |
720 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
721 | up(&ses->server->tcpSem); |
722 | /* Update # of requests on wire to server */ | |
79a58d1f | 723 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 724 | wake_up(&ses->server->request_q); |
1da177e4 LT |
725 | return -EIO; |
726 | } | |
727 | ||
ad009ac9 | 728 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
729 | |
730 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
731 | #ifdef CONFIG_CIFS_STATS2 |
732 | atomic_inc(&ses->server->inSend); | |
733 | #endif | |
1da177e4 | 734 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
edf1ae40 SF |
735 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
736 | ses->server->noblocksnd); | |
131afd0b SF |
737 | #ifdef CONFIG_CIFS_STATS2 |
738 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 739 | midQ->when_sent = jiffies; |
131afd0b | 740 | #endif |
7ee1af76 JA |
741 | up(&ses->server->tcpSem); |
742 | ||
79a58d1f | 743 | if (rc < 0) |
7ee1af76 JA |
744 | goto out; |
745 | ||
133672ef SF |
746 | if (long_op == CIFS_STD_OP) |
747 | timeout = 15 * HZ; | |
748 | /* wait for 15 seconds or until woken up due to response arriving or | |
749 | due to last connection to this server being unmounted */ | |
750 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 751 | goto out; |
133672ef | 752 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 753 | timeout = 180 * HZ; |
133672ef | 754 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 755 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 756 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
757 | else if (long_op == CIFS_BLOCKING_OP) |
758 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
759 | else { | |
760 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
761 | rc = -EIO; | |
762 | goto out; | |
763 | } | |
764 | ||
1da177e4 LT |
765 | if (signal_pending(current)) { |
766 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 767 | but we still give response a chance to complete */ |
1da177e4 | 768 | timeout = 2 * HZ; |
79a58d1f | 769 | } |
1da177e4 LT |
770 | |
771 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 772 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
773 | |
774 | spin_lock(&GlobalMid_Lock); | |
775 | if (midQ->resp_buf) { | |
776 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 777 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 778 | } else { |
79a58d1f | 779 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 780 | midQ->command, midQ->mid)); |
79a58d1f SF |
781 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
782 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
783 | rc = -EHOSTDOWN; |
784 | else { | |
785 | ses->server->tcpStatus = CifsNeedReconnect; | |
786 | midQ->midState = MID_RETRY_NEEDED; | |
787 | } | |
788 | } | |
789 | ||
790 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 791 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 792 | rc = -EAGAIN; |
79a58d1f | 793 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
794 | } else { |
795 | rc = -EIO; | |
796 | } | |
797 | } | |
798 | spin_unlock(&GlobalMid_Lock); | |
799 | DeleteMidQEntry(midQ); | |
7ee1af76 | 800 | /* Update # of requests on wire to server */ |
79a58d1f | 801 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 802 | wake_up(&ses->server->request_q); |
1da177e4 LT |
803 | return rc; |
804 | } | |
50c2f753 | 805 | |
1da177e4 | 806 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 807 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
808 | receive_len, xid)); |
809 | rc = -EIO; | |
810 | } else { /* rcvd frame is ok */ | |
811 | ||
812 | if (midQ->resp_buf && out_buf | |
813 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
814 | out_buf->smb_buf_length = receive_len; | |
815 | memcpy((char *)out_buf + 4, | |
816 | (char *)midQ->resp_buf + 4, | |
817 | receive_len); | |
818 | ||
819 | dump_smb(out_buf, 92); | |
820 | /* convert the length into a more usable form */ | |
79a58d1f | 821 | if ((receive_len > 24) && |
ad009ac9 SF |
822 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
823 | SECMODE_SIGN_ENABLED))) { | |
824 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 825 | &ses->server->mac_signing_key, |
ad009ac9 | 826 | midQ->sequence_number+1); |
79a58d1f SF |
827 | if (rc) { |
828 | cERROR(1, ("Unexpected SMB signature")); | |
275cde1a | 829 | /* BB FIXME add code to kill session */ |
ad009ac9 | 830 | } |
1da177e4 LT |
831 | } |
832 | ||
833 | *pbytes_returned = out_buf->smb_buf_length; | |
834 | ||
ad009ac9 | 835 | /* BB special case reconnect tid and uid here? */ |
a761ac57 | 836 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 LT |
837 | |
838 | /* convert ByteCount if necessary */ | |
26f57364 SF |
839 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
840 | /* do not count RFC1001 header */ + | |
1da177e4 | 841 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
0f2b27c4 | 842 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
843 | } else { |
844 | rc = -EIO; | |
79a58d1f | 845 | cERROR(1, ("Bad MID state?")); |
1da177e4 LT |
846 | } |
847 | } | |
7ee1af76 JA |
848 | |
849 | out: | |
1da177e4 | 850 | DeleteMidQEntry(midQ); |
79a58d1f | 851 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 852 | wake_up(&ses->server->request_q); |
1da177e4 | 853 | |
7ee1af76 JA |
854 | return rc; |
855 | } | |
1da177e4 | 856 | |
7ee1af76 JA |
857 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
858 | ||
859 | static int | |
860 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
861 | struct mid_q_entry *midQ) | |
862 | { | |
863 | int rc = 0; | |
864 | struct cifsSesInfo *ses = tcon->ses; | |
865 | __u16 mid = in_buf->Mid; | |
866 | ||
867 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
868 | in_buf->Mid = mid; | |
79a58d1f | 869 | down(&ses->server->tcpSem); |
7ee1af76 JA |
870 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
871 | if (rc) { | |
872 | up(&ses->server->tcpSem); | |
873 | return rc; | |
874 | } | |
875 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
876 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
877 | ses->server->noblocksnd); | |
7ee1af76 | 878 | up(&ses->server->tcpSem); |
1da177e4 | 879 | return rc; |
7ee1af76 JA |
880 | } |
881 | ||
882 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
883 | blocking lock to return. */ | |
884 | ||
885 | static int | |
886 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
887 | struct smb_hdr *in_buf, | |
888 | struct smb_hdr *out_buf) | |
889 | { | |
890 | int bytes_returned; | |
891 | struct cifsSesInfo *ses = tcon->ses; | |
892 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
893 | ||
894 | /* We just modify the current in_buf to change | |
895 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
896 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
897 | LOCKING_ANDX_CANCEL_LOCK. */ | |
898 | ||
899 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
900 | pSMB->Timeout = 0; | |
901 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
902 | ||
903 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 904 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
905 | } |
906 | ||
907 | int | |
908 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
909 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
910 | int *pbytes_returned) | |
911 | { | |
912 | int rc = 0; | |
913 | int rstart = 0; | |
914 | unsigned int receive_len; | |
915 | struct mid_q_entry *midQ; | |
916 | struct cifsSesInfo *ses; | |
917 | ||
918 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 919 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
920 | return -EIO; |
921 | } | |
922 | ses = tcon->ses; | |
923 | ||
79a58d1f SF |
924 | if (ses->server == NULL) { |
925 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
926 | return -EIO; |
927 | } | |
928 | ||
79a58d1f | 929 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
930 | return -ENOENT; |
931 | ||
79a58d1f | 932 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
933 | to the same server. We may make this configurable later or |
934 | use ses->maxReq */ | |
935 | ||
133672ef | 936 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
937 | if (rc) |
938 | return rc; | |
939 | ||
79a58d1f | 940 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
941 | and avoid races inside tcp sendmsg code that could cause corruption |
942 | of smb data */ | |
943 | ||
79a58d1f | 944 | down(&ses->server->tcpSem); |
7ee1af76 JA |
945 | |
946 | rc = allocate_mid(ses, in_buf, &midQ); | |
947 | if (rc) { | |
948 | up(&ses->server->tcpSem); | |
949 | return rc; | |
950 | } | |
951 | ||
952 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
953 | up(&ses->server->tcpSem); | |
954 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
955 | in_buf->smb_buf_length)); | |
956 | DeleteMidQEntry(midQ); | |
957 | return -EIO; | |
958 | } | |
959 | ||
960 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
1da177e4 | 961 | |
7ee1af76 JA |
962 | midQ->midState = MID_REQUEST_SUBMITTED; |
963 | #ifdef CONFIG_CIFS_STATS2 | |
964 | atomic_inc(&ses->server->inSend); | |
965 | #endif | |
966 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
edf1ae40 SF |
967 | (struct sockaddr *) &(ses->server->addr.sockAddr), |
968 | ses->server->noblocksnd); | |
7ee1af76 JA |
969 | #ifdef CONFIG_CIFS_STATS2 |
970 | atomic_dec(&ses->server->inSend); | |
971 | midQ->when_sent = jiffies; | |
972 | #endif | |
1da177e4 | 973 | up(&ses->server->tcpSem); |
7ee1af76 | 974 | |
79a58d1f | 975 | if (rc < 0) { |
7ee1af76 JA |
976 | DeleteMidQEntry(midQ); |
977 | return rc; | |
978 | } | |
979 | ||
980 | /* Wait for a reply - allow signals to interrupt. */ | |
981 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 982 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
983 | ((ses->server->tcpStatus != CifsGood) && |
984 | (ses->server->tcpStatus != CifsNew))); | |
985 | ||
986 | /* Were we interrupted by a signal ? */ | |
987 | if ((rc == -ERESTARTSYS) && | |
988 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
989 | ((ses->server->tcpStatus == CifsGood) || | |
990 | (ses->server->tcpStatus == CifsNew))) { | |
991 | ||
992 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
993 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
994 | blocking lock to return. */ | |
995 | ||
996 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
997 | if (rc) { | |
998 | DeleteMidQEntry(midQ); | |
999 | return rc; | |
1000 | } | |
1001 | } else { | |
1002 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1003 | to cause the blocking lock to return. */ | |
1004 | ||
1005 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1006 | ||
1007 | /* If we get -ENOLCK back the lock may have | |
1008 | already been removed. Don't exit in this case. */ | |
1009 | if (rc && rc != -ENOLCK) { | |
1010 | DeleteMidQEntry(midQ); | |
1011 | return rc; | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 1016 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
1017 | /* We got the response - restart system call. */ |
1018 | rstart = 1; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | spin_lock(&GlobalMid_Lock); | |
1023 | if (midQ->resp_buf) { | |
1024 | spin_unlock(&GlobalMid_Lock); | |
1025 | receive_len = midQ->resp_buf->smb_buf_length; | |
1026 | } else { | |
79a58d1f | 1027 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 1028 | midQ->command, midQ->mid)); |
79a58d1f SF |
1029 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
1030 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
1031 | rc = -EHOSTDOWN; |
1032 | else { | |
1033 | ses->server->tcpStatus = CifsNeedReconnect; | |
1034 | midQ->midState = MID_RETRY_NEEDED; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 1039 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 1040 | rc = -EAGAIN; |
79a58d1f | 1041 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
1042 | } else { |
1043 | rc = -EIO; | |
1044 | } | |
1045 | } | |
1046 | spin_unlock(&GlobalMid_Lock); | |
1047 | DeleteMidQEntry(midQ); | |
1048 | return rc; | |
1da177e4 | 1049 | } |
50c2f753 | 1050 | |
7ee1af76 JA |
1051 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
1052 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
1053 | receive_len, xid)); | |
1054 | rc = -EIO; | |
1055 | } else { /* rcvd frame is ok */ | |
1056 | ||
1057 | if (midQ->resp_buf && out_buf | |
1058 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
1059 | out_buf->smb_buf_length = receive_len; | |
1060 | memcpy((char *)out_buf + 4, | |
1061 | (char *)midQ->resp_buf + 4, | |
1062 | receive_len); | |
1063 | ||
1064 | dump_smb(out_buf, 92); | |
1065 | /* convert the length into a more usable form */ | |
79a58d1f | 1066 | if ((receive_len > 24) && |
7ee1af76 JA |
1067 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
1068 | SECMODE_SIGN_ENABLED))) { | |
1069 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 1070 | &ses->server->mac_signing_key, |
7ee1af76 | 1071 | midQ->sequence_number+1); |
79a58d1f SF |
1072 | if (rc) { |
1073 | cERROR(1, ("Unexpected SMB signature")); | |
7ee1af76 JA |
1074 | /* BB FIXME add code to kill session */ |
1075 | } | |
1076 | } | |
1077 | ||
1078 | *pbytes_returned = out_buf->smb_buf_length; | |
1079 | ||
1080 | /* BB special case reconnect tid and uid here? */ | |
a761ac57 | 1081 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 | 1082 | |
7ee1af76 | 1083 | /* convert ByteCount if necessary */ |
26f57364 SF |
1084 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
1085 | /* do not count RFC1001 header */ + | |
7ee1af76 JA |
1086 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
1087 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1088 | } else { | |
1089 | rc = -EIO; | |
79a58d1f | 1090 | cERROR(1, ("Bad MID state?")); |
7ee1af76 JA |
1091 | } |
1092 | } | |
1093 | DeleteMidQEntry(midQ); | |
1094 | if (rstart && rc == -EACCES) | |
1095 | return -ERESTARTSYS; | |
1da177e4 LT |
1096 | return rc; |
1097 | } |