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 | ||
d6e04ae6 | 157 | static int |
0496e02d | 158 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
159 | { |
160 | int rc = 0; | |
161 | int i = 0; | |
162 | struct msghdr smb_msg; | |
3e84469d SF |
163 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
164 | unsigned int len = iov[0].iov_len; | |
165 | unsigned int total_len; | |
166 | int first_vec = 0; | |
7ee1af76 | 167 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 168 | struct socket *ssocket = server->ssocket; |
50c2f753 | 169 | |
79a58d1f | 170 | if (ssocket == NULL) |
1da177e4 | 171 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 172 | |
0496e02d | 173 | smb_msg.msg_name = (struct sockaddr *) &server->addr.sockAddr; |
26f57364 | 174 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
175 | smb_msg.msg_control = NULL; |
176 | smb_msg.msg_controllen = 0; | |
0496e02d | 177 | if (server->noblocksnd) |
edf1ae40 SF |
178 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
179 | else | |
180 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
181 | |
182 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
183 | area, and byte area if necessary, is converted to littleendian in |
184 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
185 | Flags2 is converted in SendReceive */ |
186 | ||
3e84469d SF |
187 | |
188 | total_len = 0; | |
189 | for (i = 0; i < n_vec; i++) | |
190 | total_len += iov[i].iov_len; | |
191 | ||
1da177e4 | 192 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 193 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
194 | dump_smb(smb_buffer, len); |
195 | ||
17680356 | 196 | i = 0; |
3e84469d SF |
197 | while (total_len) { |
198 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
199 | n_vec - first_vec, total_len); | |
1da177e4 LT |
200 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
201 | i++; | |
da505c38 SF |
202 | /* if blocking send we try 3 times, since each can block |
203 | for 5 seconds. For nonblocking we have to try more | |
204 | but wait increasing amounts of time allowing time for | |
205 | socket to clear. The overall time we wait in either | |
206 | case to send on the socket is about 15 seconds. | |
207 | Similarly we wait for 15 seconds for | |
208 | a response from the server in SendReceive[2] | |
209 | for the server to send a response back for | |
210 | most types of requests (except SMB Write | |
211 | past end of file which can be slow, and | |
212 | blocking lock operations). NFS waits slightly longer | |
213 | than CIFS, but this can make it take longer for | |
214 | nonresponsive servers to be detected and 15 seconds | |
215 | is more than enough time for modern networks to | |
216 | send a packet. In most cases if we fail to send | |
217 | after the retries we will kill the socket and | |
218 | reconnect which may clear the network problem. | |
219 | */ | |
220 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
1da177e4 | 221 | cERROR(1, |
68058e75 | 222 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
223 | ssocket)); |
224 | rc = -EAGAIN; | |
225 | break; | |
226 | } | |
68058e75 | 227 | msleep(1 << i); |
1da177e4 LT |
228 | continue; |
229 | } | |
79a58d1f | 230 | if (rc < 0) |
1da177e4 | 231 | break; |
3e84469d | 232 | |
61de800d SF |
233 | if (rc == total_len) { |
234 | total_len = 0; | |
235 | break; | |
236 | } else if (rc > total_len) { | |
237 | cERROR(1, ("sent %d requested %d", rc, total_len)); | |
3e84469d SF |
238 | break; |
239 | } | |
79a58d1f | 240 | if (rc == 0) { |
3e84469d SF |
241 | /* should never happen, letting socket clear before |
242 | retrying is our only obvious option here */ | |
79a58d1f | 243 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
244 | msleep(500); |
245 | continue; | |
d6e04ae6 | 246 | } |
3e84469d | 247 | total_len -= rc; |
68058e75 | 248 | /* the line below resets i */ |
3e84469d SF |
249 | for (i = first_vec; i < n_vec; i++) { |
250 | if (iov[i].iov_len) { | |
251 | if (rc > iov[i].iov_len) { | |
252 | rc -= iov[i].iov_len; | |
253 | iov[i].iov_len = 0; | |
254 | } else { | |
255 | iov[i].iov_base += rc; | |
256 | iov[i].iov_len -= rc; | |
257 | first_vec = i; | |
258 | break; | |
259 | } | |
260 | } | |
d6e04ae6 | 261 | } |
5e1253b5 | 262 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
263 | } |
264 | ||
edf1ae40 SF |
265 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
266 | cFYI(1, ("partial send (%d remaining), terminating session", | |
267 | total_len)); | |
268 | /* If we have only sent part of an SMB then the next SMB | |
269 | could be taken as the remainder of this one. We need | |
270 | to kill the socket so the server throws away the partial | |
271 | SMB */ | |
272 | server->tcpStatus = CifsNeedReconnect; | |
273 | } | |
274 | ||
1da177e4 | 275 | if (rc < 0) { |
79a58d1f | 276 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 277 | } else |
1da177e4 | 278 | rc = 0; |
1da177e4 | 279 | |
7ee1af76 JA |
280 | /* Don't want to modify the buffer as a |
281 | side effect of this call. */ | |
282 | smb_buffer->smb_buf_length = smb_buf_length; | |
283 | ||
1da177e4 LT |
284 | return rc; |
285 | } | |
286 | ||
0496e02d JL |
287 | int |
288 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
289 | unsigned int smb_buf_length) | |
290 | { | |
291 | struct kvec iov; | |
292 | ||
293 | iov.iov_base = smb_buffer; | |
294 | iov.iov_len = smb_buf_length + 4; | |
295 | ||
296 | return smb_sendv(server, &iov, 1); | |
297 | } | |
298 | ||
7ee1af76 | 299 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 300 | { |
133672ef | 301 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
302 | /* oplock breaks must not be held up */ |
303 | atomic_inc(&ses->server->inFlight); | |
27a97a61 VL |
304 | return 0; |
305 | } | |
306 | ||
307 | spin_lock(&GlobalMid_Lock); | |
308 | while (1) { | |
309 | if (atomic_read(&ses->server->inFlight) >= | |
310 | cifs_max_pending){ | |
311 | spin_unlock(&GlobalMid_Lock); | |
131afd0b | 312 | #ifdef CONFIG_CIFS_STATS2 |
27a97a61 | 313 | atomic_inc(&ses->server->num_waiters); |
131afd0b | 314 | #endif |
27a97a61 VL |
315 | wait_event(ses->server->request_q, |
316 | atomic_read(&ses->server->inFlight) | |
317 | < cifs_max_pending); | |
131afd0b | 318 | #ifdef CONFIG_CIFS_STATS2 |
27a97a61 | 319 | atomic_dec(&ses->server->num_waiters); |
131afd0b | 320 | #endif |
27a97a61 VL |
321 | spin_lock(&GlobalMid_Lock); |
322 | } else { | |
323 | if (ses->server->tcpStatus == CifsExiting) { | |
1da177e4 | 324 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 325 | return -ENOENT; |
1da177e4 | 326 | } |
27a97a61 VL |
327 | |
328 | /* can not count locking commands against total | |
329 | as they are allowed to block on server */ | |
330 | ||
331 | /* update # of requests on the wire to server */ | |
332 | if (long_op != CIFS_BLOCKING_OP) | |
333 | atomic_inc(&ses->server->inFlight); | |
334 | spin_unlock(&GlobalMid_Lock); | |
335 | break; | |
1da177e4 LT |
336 | } |
337 | } | |
7ee1af76 JA |
338 | return 0; |
339 | } | |
1da177e4 | 340 | |
7ee1af76 JA |
341 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
342 | struct mid_q_entry **ppmidQ) | |
343 | { | |
1da177e4 | 344 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 345 | return -ENOENT; |
8fbbd365 VL |
346 | } |
347 | ||
348 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
79a58d1f | 349 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 350 | return -EAGAIN; |
8fbbd365 VL |
351 | } |
352 | ||
353 | if (ses->status != CifsGood) { | |
1da177e4 | 354 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 355 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 356 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 357 | return -EAGAIN; |
ad7a2926 | 358 | /* else ok - we are setting up session */ |
1da177e4 | 359 | } |
24b9b06b | 360 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 361 | if (*ppmidQ == NULL) |
7ee1af76 | 362 | return -ENOMEM; |
7ee1af76 JA |
363 | return 0; |
364 | } | |
365 | ||
79a58d1f | 366 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
367 | struct mid_q_entry *midQ, |
368 | unsigned long timeout, | |
369 | unsigned long time_to_wait) | |
370 | { | |
371 | unsigned long curr_timeout; | |
372 | ||
373 | for (;;) { | |
374 | curr_timeout = timeout + jiffies; | |
85705524 JL |
375 | wait_event_timeout(ses->server->response_q, |
376 | midQ->midState != MID_REQUEST_SUBMITTED, timeout); | |
7ee1af76 JA |
377 | |
378 | if (time_after(jiffies, curr_timeout) && | |
379 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
380 | ((ses->server->tcpStatus == CifsGood) || | |
381 | (ses->server->tcpStatus == CifsNew))) { | |
382 | ||
383 | unsigned long lrt; | |
384 | ||
385 | /* We timed out. Is the server still | |
386 | sending replies ? */ | |
387 | spin_lock(&GlobalMid_Lock); | |
388 | lrt = ses->server->lstrp; | |
389 | spin_unlock(&GlobalMid_Lock); | |
390 | ||
391 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 392 | Although we prefer not to time out if the |
7ee1af76 | 393 | server is still responding - we will time |
79a58d1f | 394 | out if the server takes more than 15 (or 45 |
7ee1af76 | 395 | or 180) seconds to respond to this request |
79a58d1f | 396 | and has not responded to any request from |
7ee1af76 JA |
397 | other threads on the client within 10 seconds */ |
398 | lrt += time_to_wait; | |
399 | if (time_after(jiffies, lrt)) { | |
400 | /* No replies for time_to_wait. */ | |
79a58d1f | 401 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
402 | return -1; |
403 | } | |
404 | } else { | |
405 | return 0; | |
406 | } | |
407 | } | |
408 | } | |
409 | ||
133672ef SF |
410 | |
411 | /* | |
412 | * | |
413 | * Send an SMB Request. No response info (other than return code) | |
414 | * needs to be parsed. | |
415 | * | |
416 | * flags indicate the type of request buffer and how long to wait | |
417 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
418 | * | |
419 | */ | |
420 | int | |
421 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
422 | struct smb_hdr *in_buf, int flags) | |
423 | { | |
424 | int rc; | |
425 | struct kvec iov[1]; | |
426 | int resp_buf_type; | |
427 | ||
428 | iov[0].iov_base = (char *)in_buf; | |
429 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
430 | flags |= CIFS_NO_RESP; | |
431 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
432 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
433 | ||
133672ef SF |
434 | return rc; |
435 | } | |
436 | ||
7ee1af76 | 437 | int |
79a58d1f SF |
438 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
439 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 440 | const int flags) |
7ee1af76 JA |
441 | { |
442 | int rc = 0; | |
133672ef | 443 | int long_op; |
7ee1af76 JA |
444 | unsigned int receive_len; |
445 | unsigned long timeout; | |
446 | struct mid_q_entry *midQ; | |
447 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 448 | |
133672ef SF |
449 | long_op = flags & CIFS_TIMEOUT_MASK; |
450 | ||
7ee1af76 JA |
451 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
452 | ||
453 | if ((ses == NULL) || (ses->server == NULL)) { | |
454 | cifs_small_buf_release(in_buf); | |
79a58d1f | 455 | cERROR(1, ("Null session")); |
7ee1af76 JA |
456 | return -EIO; |
457 | } | |
458 | ||
79a58d1f | 459 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
460 | cifs_small_buf_release(in_buf); |
461 | return -ENOENT; | |
462 | } | |
463 | ||
79a58d1f | 464 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
465 | to the same server. We may make this configurable later or |
466 | use ses->maxReq */ | |
467 | ||
468 | rc = wait_for_free_request(ses, long_op); | |
469 | if (rc) { | |
470 | cifs_small_buf_release(in_buf); | |
471 | return rc; | |
472 | } | |
473 | ||
79a58d1f | 474 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
475 | and avoid races inside tcp sendmsg code that could cause corruption |
476 | of smb data */ | |
477 | ||
72ca545b | 478 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
479 | |
480 | rc = allocate_mid(ses, in_buf, &midQ); | |
481 | if (rc) { | |
72ca545b | 482 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 483 | cifs_small_buf_release(in_buf); |
7ee1af76 | 484 | /* Update # of requests on wire to server */ |
79a58d1f | 485 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
486 | wake_up(&ses->server->request_q); |
487 | return rc; | |
1da177e4 | 488 | } |
79a58d1f | 489 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
490 | if (rc) { |
491 | mutex_unlock(&ses->server->srv_mutex); | |
492 | cifs_small_buf_release(in_buf); | |
493 | goto out; | |
494 | } | |
1da177e4 LT |
495 | |
496 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
497 | #ifdef CONFIG_CIFS_STATS2 |
498 | atomic_inc(&ses->server->inSend); | |
499 | #endif | |
0496e02d | 500 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
501 | #ifdef CONFIG_CIFS_STATS2 |
502 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 503 | midQ->when_sent = jiffies; |
131afd0b | 504 | #endif |
7ee1af76 | 505 | |
72ca545b | 506 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
507 | cifs_small_buf_release(in_buf); |
508 | ||
79a58d1f | 509 | if (rc < 0) |
7ee1af76 | 510 | goto out; |
4b8f930f | 511 | |
133672ef SF |
512 | if (long_op == CIFS_STD_OP) |
513 | timeout = 15 * HZ; | |
514 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 515 | timeout = 180 * HZ; |
133672ef | 516 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 517 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 518 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
519 | else if (long_op == CIFS_ASYNC_OP) |
520 | goto out; | |
521 | else if (long_op == CIFS_BLOCKING_OP) | |
522 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
523 | else { | |
524 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
525 | rc = -EIO; | |
526 | goto out; | |
527 | } | |
7ee1af76 | 528 | |
79a58d1f | 529 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
530 | due to last connection to this server being unmounted */ |
531 | if (signal_pending(current)) { | |
532 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 533 | but we still give response a chance to complete */ |
d6e04ae6 | 534 | timeout = 2 * HZ; |
79a58d1f | 535 | } |
d6e04ae6 SF |
536 | |
537 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 538 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
539 | |
540 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a VL |
541 | |
542 | if (midQ->resp_buf == NULL) { | |
79a58d1f | 543 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 544 | midQ->command, midQ->mid)); |
79a58d1f SF |
545 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
546 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
547 | rc = -EHOSTDOWN; |
548 | else { | |
549 | ses->server->tcpStatus = CifsNeedReconnect; | |
550 | midQ->midState = MID_RETRY_NEEDED; | |
551 | } | |
552 | } | |
553 | ||
554 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 555 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 556 | rc = -EAGAIN; |
79a58d1f | 557 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
558 | } else { |
559 | rc = -EIO; | |
560 | } | |
561 | } | |
562 | spin_unlock(&GlobalMid_Lock); | |
563 | DeleteMidQEntry(midQ); | |
7ee1af76 | 564 | /* Update # of requests on wire to server */ |
79a58d1f | 565 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 566 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
567 | return rc; |
568 | } | |
50c2f753 | 569 | |
8e4f2e8a VL |
570 | spin_unlock(&GlobalMid_Lock); |
571 | receive_len = midQ->resp_buf->smb_buf_length; | |
572 | ||
d6e04ae6 SF |
573 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
574 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
575 | receive_len, xid)); | |
576 | rc = -EIO; | |
2b2bdfba SF |
577 | goto out; |
578 | } | |
579 | ||
580 | /* rcvd frame is ok */ | |
581 | ||
582 | if (midQ->resp_buf && | |
583 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
584 | ||
585 | iov[0].iov_base = (char *)midQ->resp_buf; | |
586 | if (midQ->largeBuf) | |
587 | *pRespBufType = CIFS_LARGE_BUFFER; | |
588 | else | |
589 | *pRespBufType = CIFS_SMALL_BUFFER; | |
590 | iov[0].iov_len = receive_len + 4; | |
591 | ||
592 | dump_smb(midQ->resp_buf, 80); | |
593 | /* convert the length into a more usable form */ | |
594 | if ((receive_len > 24) && | |
595 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
596 | SECMODE_SIGN_ENABLED))) { | |
597 | rc = cifs_verify_signature(midQ->resp_buf, | |
b609f06a | 598 | &ses->server->mac_signing_key, |
d6e04ae6 | 599 | midQ->sequence_number+1); |
2b2bdfba SF |
600 | if (rc) { |
601 | cERROR(1, ("Unexpected SMB signature")); | |
602 | /* BB FIXME add code to kill session */ | |
d6e04ae6 | 603 | } |
d6e04ae6 | 604 | } |
2b2bdfba SF |
605 | |
606 | /* BB special case reconnect tid and uid here? */ | |
607 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
608 | flags & CIFS_LOG_ERROR); | |
609 | ||
610 | /* convert ByteCount if necessary */ | |
611 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
612 | /* do not count RFC1001 header */ + | |
613 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
614 | BCC(midQ->resp_buf) = | |
615 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
616 | if ((flags & CIFS_NO_RESP) == 0) | |
617 | midQ->resp_buf = NULL; /* mark it so buf will | |
618 | not be freed by | |
619 | DeleteMidQEntry */ | |
620 | } else { | |
621 | rc = -EIO; | |
622 | cFYI(1, ("Bad MID state?")); | |
d6e04ae6 | 623 | } |
1da177e4 | 624 | |
7ee1af76 | 625 | out: |
7ee1af76 | 626 | DeleteMidQEntry(midQ); |
79a58d1f | 627 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 628 | wake_up(&ses->server->request_q); |
1da177e4 | 629 | |
d6e04ae6 SF |
630 | return rc; |
631 | } | |
1da177e4 LT |
632 | |
633 | int | |
634 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
635 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
636 | int *pbytes_returned, const int long_op) | |
637 | { | |
638 | int rc = 0; | |
639 | unsigned int receive_len; | |
640 | unsigned long timeout; | |
641 | struct mid_q_entry *midQ; | |
642 | ||
643 | if (ses == NULL) { | |
79a58d1f | 644 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
645 | return -EIO; |
646 | } | |
79a58d1f SF |
647 | if (ses->server == NULL) { |
648 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
649 | return -EIO; |
650 | } | |
651 | ||
79a58d1f | 652 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
653 | return -ENOENT; |
654 | ||
79a58d1f | 655 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
656 | to the same server. We may make this configurable later or |
657 | use ses->maxReq */ | |
1da177e4 | 658 | |
6d9c6d54 VL |
659 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
660 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
661 | in_buf->smb_buf_length)); | |
662 | return -EIO; | |
663 | } | |
664 | ||
7ee1af76 JA |
665 | rc = wait_for_free_request(ses, long_op); |
666 | if (rc) | |
667 | return rc; | |
668 | ||
79a58d1f | 669 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
670 | and avoid races inside tcp sendmsg code that could cause corruption |
671 | of smb data */ | |
672 | ||
72ca545b | 673 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 674 | |
7ee1af76 JA |
675 | rc = allocate_mid(ses, in_buf, &midQ); |
676 | if (rc) { | |
72ca545b | 677 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 678 | /* Update # of requests on wire to server */ |
79a58d1f | 679 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
680 | wake_up(&ses->server->request_q); |
681 | return rc; | |
1da177e4 LT |
682 | } |
683 | ||
ad009ac9 | 684 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
685 | if (rc) { |
686 | mutex_unlock(&ses->server->srv_mutex); | |
687 | goto out; | |
688 | } | |
1da177e4 LT |
689 | |
690 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
691 | #ifdef CONFIG_CIFS_STATS2 |
692 | atomic_inc(&ses->server->inSend); | |
693 | #endif | |
0496e02d | 694 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
695 | #ifdef CONFIG_CIFS_STATS2 |
696 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 697 | midQ->when_sent = jiffies; |
131afd0b | 698 | #endif |
72ca545b | 699 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 700 | |
79a58d1f | 701 | if (rc < 0) |
7ee1af76 JA |
702 | goto out; |
703 | ||
133672ef SF |
704 | if (long_op == CIFS_STD_OP) |
705 | timeout = 15 * HZ; | |
706 | /* wait for 15 seconds or until woken up due to response arriving or | |
707 | due to last connection to this server being unmounted */ | |
708 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 709 | goto out; |
133672ef | 710 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 711 | timeout = 180 * HZ; |
133672ef | 712 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 713 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 714 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
715 | else if (long_op == CIFS_BLOCKING_OP) |
716 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
717 | else { | |
718 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
719 | rc = -EIO; | |
720 | goto out; | |
721 | } | |
722 | ||
1da177e4 LT |
723 | if (signal_pending(current)) { |
724 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 725 | but we still give response a chance to complete */ |
1da177e4 | 726 | timeout = 2 * HZ; |
79a58d1f | 727 | } |
1da177e4 LT |
728 | |
729 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 730 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
731 | |
732 | spin_lock(&GlobalMid_Lock); | |
8e4f2e8a | 733 | if (midQ->resp_buf == NULL) { |
79a58d1f | 734 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 735 | midQ->command, midQ->mid)); |
79a58d1f SF |
736 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
737 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
738 | rc = -EHOSTDOWN; |
739 | else { | |
740 | ses->server->tcpStatus = CifsNeedReconnect; | |
741 | midQ->midState = MID_RETRY_NEEDED; | |
742 | } | |
743 | } | |
744 | ||
745 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 746 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 747 | rc = -EAGAIN; |
79a58d1f | 748 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
749 | } else { |
750 | rc = -EIO; | |
751 | } | |
752 | } | |
753 | spin_unlock(&GlobalMid_Lock); | |
754 | DeleteMidQEntry(midQ); | |
7ee1af76 | 755 | /* Update # of requests on wire to server */ |
79a58d1f | 756 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 757 | wake_up(&ses->server->request_q); |
1da177e4 LT |
758 | return rc; |
759 | } | |
50c2f753 | 760 | |
8e4f2e8a VL |
761 | spin_unlock(&GlobalMid_Lock); |
762 | receive_len = midQ->resp_buf->smb_buf_length; | |
763 | ||
1da177e4 | 764 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 765 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
766 | receive_len, xid)); |
767 | rc = -EIO; | |
2b2bdfba SF |
768 | goto out; |
769 | } | |
770 | ||
771 | /* rcvd frame is ok */ | |
772 | ||
773 | if (midQ->resp_buf && out_buf | |
774 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
775 | out_buf->smb_buf_length = receive_len; | |
776 | memcpy((char *)out_buf + 4, | |
777 | (char *)midQ->resp_buf + 4, | |
778 | receive_len); | |
779 | ||
780 | dump_smb(out_buf, 92); | |
781 | /* convert the length into a more usable form */ | |
782 | if ((receive_len > 24) && | |
783 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
784 | SECMODE_SIGN_ENABLED))) { | |
785 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 786 | &ses->server->mac_signing_key, |
ad009ac9 | 787 | midQ->sequence_number+1); |
2b2bdfba SF |
788 | if (rc) { |
789 | cERROR(1, ("Unexpected SMB signature")); | |
790 | /* BB FIXME add code to kill session */ | |
1da177e4 | 791 | } |
2b2bdfba | 792 | } |
1da177e4 | 793 | |
2b2bdfba | 794 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 795 | |
2b2bdfba SF |
796 | /* BB special case reconnect tid and uid here? */ |
797 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 798 | |
2b2bdfba SF |
799 | /* convert ByteCount if necessary */ |
800 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
801 | /* do not count RFC1001 header */ + | |
802 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
803 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
804 | } else { | |
805 | rc = -EIO; | |
806 | cERROR(1, ("Bad MID state?")); | |
1da177e4 | 807 | } |
7ee1af76 JA |
808 | |
809 | out: | |
1da177e4 | 810 | DeleteMidQEntry(midQ); |
79a58d1f | 811 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 812 | wake_up(&ses->server->request_q); |
1da177e4 | 813 | |
7ee1af76 JA |
814 | return rc; |
815 | } | |
1da177e4 | 816 | |
7ee1af76 JA |
817 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
818 | ||
819 | static int | |
820 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
821 | struct mid_q_entry *midQ) | |
822 | { | |
823 | int rc = 0; | |
824 | struct cifsSesInfo *ses = tcon->ses; | |
825 | __u16 mid = in_buf->Mid; | |
826 | ||
827 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
828 | in_buf->Mid = mid; | |
72ca545b | 829 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
830 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
831 | if (rc) { | |
72ca545b | 832 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
833 | return rc; |
834 | } | |
0496e02d | 835 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 836 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 837 | return rc; |
7ee1af76 JA |
838 | } |
839 | ||
840 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
841 | blocking lock to return. */ | |
842 | ||
843 | static int | |
844 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
845 | struct smb_hdr *in_buf, | |
846 | struct smb_hdr *out_buf) | |
847 | { | |
848 | int bytes_returned; | |
849 | struct cifsSesInfo *ses = tcon->ses; | |
850 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
851 | ||
852 | /* We just modify the current in_buf to change | |
853 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
854 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
855 | LOCKING_ANDX_CANCEL_LOCK. */ | |
856 | ||
857 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
858 | pSMB->Timeout = 0; | |
859 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
860 | ||
861 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 862 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
863 | } |
864 | ||
865 | int | |
866 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
867 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
868 | int *pbytes_returned) | |
869 | { | |
870 | int rc = 0; | |
871 | int rstart = 0; | |
872 | unsigned int receive_len; | |
873 | struct mid_q_entry *midQ; | |
874 | struct cifsSesInfo *ses; | |
875 | ||
876 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 877 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
878 | return -EIO; |
879 | } | |
880 | ses = tcon->ses; | |
881 | ||
79a58d1f SF |
882 | if (ses->server == NULL) { |
883 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
884 | return -EIO; |
885 | } | |
886 | ||
79a58d1f | 887 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
888 | return -ENOENT; |
889 | ||
79a58d1f | 890 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
891 | to the same server. We may make this configurable later or |
892 | use ses->maxReq */ | |
893 | ||
6d9c6d54 VL |
894 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
895 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
896 | in_buf->smb_buf_length)); | |
897 | return -EIO; | |
898 | } | |
899 | ||
133672ef | 900 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
901 | if (rc) |
902 | return rc; | |
903 | ||
79a58d1f | 904 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
905 | and avoid races inside tcp sendmsg code that could cause corruption |
906 | of smb data */ | |
907 | ||
72ca545b | 908 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
909 | |
910 | rc = allocate_mid(ses, in_buf, &midQ); | |
911 | if (rc) { | |
72ca545b | 912 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
913 | return rc; |
914 | } | |
915 | ||
7ee1af76 | 916 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
917 | if (rc) { |
918 | DeleteMidQEntry(midQ); | |
919 | mutex_unlock(&ses->server->srv_mutex); | |
920 | return rc; | |
921 | } | |
1da177e4 | 922 | |
7ee1af76 JA |
923 | midQ->midState = MID_REQUEST_SUBMITTED; |
924 | #ifdef CONFIG_CIFS_STATS2 | |
925 | atomic_inc(&ses->server->inSend); | |
926 | #endif | |
0496e02d | 927 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
928 | #ifdef CONFIG_CIFS_STATS2 |
929 | atomic_dec(&ses->server->inSend); | |
930 | midQ->when_sent = jiffies; | |
931 | #endif | |
72ca545b | 932 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 933 | |
79a58d1f | 934 | if (rc < 0) { |
7ee1af76 JA |
935 | DeleteMidQEntry(midQ); |
936 | return rc; | |
937 | } | |
938 | ||
939 | /* Wait for a reply - allow signals to interrupt. */ | |
940 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 941 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
942 | ((ses->server->tcpStatus != CifsGood) && |
943 | (ses->server->tcpStatus != CifsNew))); | |
944 | ||
945 | /* Were we interrupted by a signal ? */ | |
946 | if ((rc == -ERESTARTSYS) && | |
947 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
948 | ((ses->server->tcpStatus == CifsGood) || | |
949 | (ses->server->tcpStatus == CifsNew))) { | |
950 | ||
951 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
952 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
953 | blocking lock to return. */ | |
954 | ||
955 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
956 | if (rc) { | |
957 | DeleteMidQEntry(midQ); | |
958 | return rc; | |
959 | } | |
960 | } else { | |
961 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
962 | to cause the blocking lock to return. */ | |
963 | ||
964 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
965 | ||
966 | /* If we get -ENOLCK back the lock may have | |
967 | already been removed. Don't exit in this case. */ | |
968 | if (rc && rc != -ENOLCK) { | |
969 | DeleteMidQEntry(midQ); | |
970 | return rc; | |
971 | } | |
972 | } | |
973 | ||
974 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 975 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
976 | /* We got the response - restart system call. */ |
977 | rstart = 1; | |
978 | } | |
979 | } | |
980 | ||
981 | spin_lock(&GlobalMid_Lock); | |
982 | if (midQ->resp_buf) { | |
983 | spin_unlock(&GlobalMid_Lock); | |
984 | receive_len = midQ->resp_buf->smb_buf_length; | |
985 | } else { | |
79a58d1f | 986 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 987 | midQ->command, midQ->mid)); |
79a58d1f SF |
988 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
989 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
990 | rc = -EHOSTDOWN; |
991 | else { | |
992 | ses->server->tcpStatus = CifsNeedReconnect; | |
993 | midQ->midState = MID_RETRY_NEEDED; | |
994 | } | |
995 | } | |
996 | ||
997 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 998 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 999 | rc = -EAGAIN; |
79a58d1f | 1000 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
1001 | } else { |
1002 | rc = -EIO; | |
1003 | } | |
1004 | } | |
1005 | spin_unlock(&GlobalMid_Lock); | |
1006 | DeleteMidQEntry(midQ); | |
1007 | return rc; | |
1da177e4 | 1008 | } |
50c2f753 | 1009 | |
7ee1af76 JA |
1010 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
1011 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
1012 | receive_len, xid)); | |
1013 | rc = -EIO; | |
17c8bfed VL |
1014 | goto out; |
1015 | } | |
7ee1af76 | 1016 | |
17c8bfed | 1017 | /* rcvd frame is ok */ |
7ee1af76 | 1018 | |
ac6a3ef4 | 1019 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 VL |
1020 | rc = -EIO; |
1021 | cERROR(1, ("Bad MID state?")); | |
1022 | goto out; | |
1023 | } | |
1da177e4 | 1024 | |
698e96a8 VL |
1025 | out_buf->smb_buf_length = receive_len; |
1026 | memcpy((char *)out_buf + 4, | |
1027 | (char *)midQ->resp_buf + 4, | |
1028 | receive_len); | |
1029 | ||
1030 | dump_smb(out_buf, 92); | |
1031 | /* convert the length into a more usable form */ | |
1032 | if ((receive_len > 24) && | |
1033 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
1034 | SECMODE_SIGN_ENABLED))) { | |
1035 | rc = cifs_verify_signature(out_buf, | |
1036 | &ses->server->mac_signing_key, | |
1037 | midQ->sequence_number+1); | |
1038 | if (rc) { | |
1039 | cERROR(1, ("Unexpected SMB signature")); | |
1040 | /* BB FIXME add code to kill session */ | |
7ee1af76 | 1041 | } |
698e96a8 | 1042 | } |
17c8bfed | 1043 | |
698e96a8 | 1044 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 1045 | |
698e96a8 VL |
1046 | /* BB special case reconnect tid and uid here? */ |
1047 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 1048 | |
698e96a8 VL |
1049 | /* convert ByteCount if necessary */ |
1050 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
1051 | /* do not count RFC1001 header */ + | |
1052 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
1053 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
1054 | |
1055 | out: | |
7ee1af76 JA |
1056 | DeleteMidQEntry(midQ); |
1057 | if (rstart && rc == -EACCES) | |
1058 | return -ERESTARTSYS; | |
1da177e4 LT |
1059 | return rc; |
1060 | } |