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