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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
79a58d1f | 4 | * Copyright (C) International Business Machines Corp., 2002,2007 |
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 | ||
145 | int | |
146 | smb_send(struct socket *ssocket, struct smb_hdr *smb_buffer, | |
147 | unsigned int smb_buf_length, struct sockaddr *sin) | |
148 | { | |
149 | int rc = 0; | |
150 | int i = 0; | |
151 | struct msghdr smb_msg; | |
152 | struct kvec iov; | |
153 | unsigned len = smb_buf_length + 4; | |
154 | ||
79a58d1f | 155 | if (ssocket == NULL) |
1da177e4 LT |
156 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
157 | iov.iov_base = smb_buffer; | |
158 | iov.iov_len = len; | |
159 | ||
160 | smb_msg.msg_name = sin; | |
26f57364 | 161 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
162 | smb_msg.msg_control = NULL; |
163 | smb_msg.msg_controllen = 0; | |
164 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ | |
165 | ||
166 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
167 | area, and byte area if necessary, is converted to littleendian in |
168 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
169 | Flags2 is converted in SendReceive */ |
170 | ||
171 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); | |
3e84469d | 172 | cFYI(1, ("Sending smb of length %d", smb_buf_length)); |
1da177e4 LT |
173 | dump_smb(smb_buffer, len); |
174 | ||
175 | while (len > 0) { | |
176 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov, 1, len); | |
177 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { | |
178 | i++; | |
3e84469d | 179 | /* smaller timeout here than send2 since smaller size */ |
79a58d1f SF |
180 | /* Although it may not be required, this also is smaller |
181 | oplock break time */ | |
182 | if (i > 12) { | |
1da177e4 | 183 | cERROR(1, |
68058e75 | 184 | ("sends on sock %p stuck for 7 seconds", |
1da177e4 LT |
185 | ssocket)); |
186 | rc = -EAGAIN; | |
187 | break; | |
188 | } | |
68058e75 | 189 | msleep(1 << i); |
1da177e4 LT |
190 | continue; |
191 | } | |
79a58d1f | 192 | if (rc < 0) |
1da177e4 | 193 | break; |
5e1253b5 SF |
194 | else |
195 | i = 0; /* reset i after each successful send */ | |
1da177e4 LT |
196 | iov.iov_base += rc; |
197 | iov.iov_len -= rc; | |
198 | len -= rc; | |
199 | } | |
200 | ||
201 | if (rc < 0) { | |
79a58d1f | 202 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
1da177e4 LT |
203 | } else { |
204 | rc = 0; | |
205 | } | |
206 | ||
7ee1af76 JA |
207 | /* Don't want to modify the buffer as a |
208 | side effect of this call. */ | |
209 | smb_buffer->smb_buf_length = smb_buf_length; | |
210 | ||
1da177e4 LT |
211 | return rc; |
212 | } | |
213 | ||
d6e04ae6 | 214 | static int |
3e84469d SF |
215 | smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec, |
216 | struct sockaddr *sin) | |
1da177e4 LT |
217 | { |
218 | int rc = 0; | |
219 | int i = 0; | |
220 | struct msghdr smb_msg; | |
3e84469d SF |
221 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
222 | unsigned int len = iov[0].iov_len; | |
223 | unsigned int total_len; | |
224 | int first_vec = 0; | |
7ee1af76 | 225 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
50c2f753 | 226 | |
79a58d1f | 227 | if (ssocket == NULL) |
1da177e4 | 228 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 229 | |
1da177e4 | 230 | smb_msg.msg_name = sin; |
26f57364 | 231 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
232 | smb_msg.msg_control = NULL; |
233 | smb_msg.msg_controllen = 0; | |
234 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; /* BB add more flags?*/ | |
235 | ||
236 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
237 | area, and byte area if necessary, is converted to littleendian in |
238 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
239 | Flags2 is converted in SendReceive */ |
240 | ||
3e84469d SF |
241 | |
242 | total_len = 0; | |
243 | for (i = 0; i < n_vec; i++) | |
244 | total_len += iov[i].iov_len; | |
245 | ||
1da177e4 | 246 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
3e84469d | 247 | cFYI(1, ("Sending smb: total_len %d", total_len)); |
1da177e4 LT |
248 | dump_smb(smb_buffer, len); |
249 | ||
3e84469d SF |
250 | while (total_len) { |
251 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
252 | n_vec - first_vec, total_len); | |
1da177e4 LT |
253 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
254 | i++; | |
79a58d1f | 255 | if (i >= 14) { |
1da177e4 | 256 | cERROR(1, |
68058e75 | 257 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
258 | ssocket)); |
259 | rc = -EAGAIN; | |
260 | break; | |
261 | } | |
68058e75 | 262 | msleep(1 << i); |
1da177e4 LT |
263 | continue; |
264 | } | |
79a58d1f | 265 | if (rc < 0) |
1da177e4 | 266 | break; |
3e84469d SF |
267 | |
268 | if (rc >= total_len) { | |
269 | WARN_ON(rc > total_len); | |
270 | break; | |
271 | } | |
79a58d1f | 272 | if (rc == 0) { |
3e84469d SF |
273 | /* should never happen, letting socket clear before |
274 | retrying is our only obvious option here */ | |
79a58d1f | 275 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
276 | msleep(500); |
277 | continue; | |
d6e04ae6 | 278 | } |
3e84469d | 279 | total_len -= rc; |
68058e75 | 280 | /* the line below resets i */ |
3e84469d SF |
281 | for (i = first_vec; i < n_vec; i++) { |
282 | if (iov[i].iov_len) { | |
283 | if (rc > iov[i].iov_len) { | |
284 | rc -= iov[i].iov_len; | |
285 | iov[i].iov_len = 0; | |
286 | } else { | |
287 | iov[i].iov_base += rc; | |
288 | iov[i].iov_len -= rc; | |
289 | first_vec = i; | |
290 | break; | |
291 | } | |
292 | } | |
d6e04ae6 | 293 | } |
5e1253b5 | 294 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
295 | } |
296 | ||
297 | if (rc < 0) { | |
79a58d1f | 298 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 299 | } else |
1da177e4 | 300 | rc = 0; |
1da177e4 | 301 | |
7ee1af76 JA |
302 | /* Don't want to modify the buffer as a |
303 | side effect of this call. */ | |
304 | smb_buffer->smb_buf_length = smb_buf_length; | |
305 | ||
1da177e4 LT |
306 | return rc; |
307 | } | |
308 | ||
7ee1af76 | 309 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 310 | { |
133672ef | 311 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
312 | /* oplock breaks must not be held up */ |
313 | atomic_inc(&ses->server->inFlight); | |
314 | } else { | |
79a58d1f SF |
315 | spin_lock(&GlobalMid_Lock); |
316 | while (1) { | |
317 | if (atomic_read(&ses->server->inFlight) >= | |
d6e04ae6 | 318 | cifs_max_pending){ |
1da177e4 | 319 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
320 | #ifdef CONFIG_CIFS_STATS2 |
321 | atomic_inc(&ses->server->num_waiters); | |
322 | #endif | |
1da177e4 LT |
323 | wait_event(ses->server->request_q, |
324 | atomic_read(&ses->server->inFlight) | |
325 | < cifs_max_pending); | |
131afd0b SF |
326 | #ifdef CONFIG_CIFS_STATS2 |
327 | atomic_dec(&ses->server->num_waiters); | |
328 | #endif | |
1da177e4 LT |
329 | spin_lock(&GlobalMid_Lock); |
330 | } else { | |
79a58d1f | 331 | if (ses->server->tcpStatus == CifsExiting) { |
1da177e4 LT |
332 | spin_unlock(&GlobalMid_Lock); |
333 | return -ENOENT; | |
334 | } | |
335 | ||
79a58d1f SF |
336 | /* can not count locking commands against total |
337 | as they are allowed to block on server */ | |
50c2f753 | 338 | |
1da177e4 | 339 | /* update # of requests on the wire to server */ |
133672ef | 340 | if (long_op != CIFS_BLOCKING_OP) |
1da177e4 | 341 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
342 | spin_unlock(&GlobalMid_Lock); |
343 | break; | |
344 | } | |
345 | } | |
346 | } | |
7ee1af76 JA |
347 | return 0; |
348 | } | |
1da177e4 | 349 | |
7ee1af76 JA |
350 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
351 | struct mid_q_entry **ppmidQ) | |
352 | { | |
1da177e4 | 353 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 354 | return -ENOENT; |
1da177e4 | 355 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
79a58d1f | 356 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 357 | return -EAGAIN; |
1da177e4 LT |
358 | } else if (ses->status != CifsGood) { |
359 | /* check if SMB session is bad because we are setting it up */ | |
79a58d1f | 360 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
1da177e4 | 361 | (in_buf->Command != SMB_COM_NEGOTIATE)) { |
7ee1af76 | 362 | return -EAGAIN; |
1da177e4 LT |
363 | } /* else ok - we are setting up session */ |
364 | } | |
7ee1af76 | 365 | *ppmidQ = AllocMidQEntry(in_buf, ses); |
26f57364 | 366 | if (*ppmidQ == NULL) |
7ee1af76 | 367 | return -ENOMEM; |
7ee1af76 JA |
368 | return 0; |
369 | } | |
370 | ||
79a58d1f | 371 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
372 | struct mid_q_entry *midQ, |
373 | unsigned long timeout, | |
374 | unsigned long time_to_wait) | |
375 | { | |
376 | unsigned long curr_timeout; | |
377 | ||
378 | for (;;) { | |
379 | curr_timeout = timeout + jiffies; | |
380 | wait_event(ses->server->response_q, | |
79a58d1f SF |
381 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
382 | time_after(jiffies, curr_timeout) || | |
7ee1af76 JA |
383 | ((ses->server->tcpStatus != CifsGood) && |
384 | (ses->server->tcpStatus != CifsNew))); | |
385 | ||
386 | if (time_after(jiffies, curr_timeout) && | |
387 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
388 | ((ses->server->tcpStatus == CifsGood) || | |
389 | (ses->server->tcpStatus == CifsNew))) { | |
390 | ||
391 | unsigned long lrt; | |
392 | ||
393 | /* We timed out. Is the server still | |
394 | sending replies ? */ | |
395 | spin_lock(&GlobalMid_Lock); | |
396 | lrt = ses->server->lstrp; | |
397 | spin_unlock(&GlobalMid_Lock); | |
398 | ||
399 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 400 | Although we prefer not to time out if the |
7ee1af76 | 401 | server is still responding - we will time |
79a58d1f | 402 | out if the server takes more than 15 (or 45 |
7ee1af76 | 403 | or 180) seconds to respond to this request |
79a58d1f | 404 | and has not responded to any request from |
7ee1af76 JA |
405 | other threads on the client within 10 seconds */ |
406 | lrt += time_to_wait; | |
407 | if (time_after(jiffies, lrt)) { | |
408 | /* No replies for time_to_wait. */ | |
79a58d1f | 409 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
410 | return -1; |
411 | } | |
412 | } else { | |
413 | return 0; | |
414 | } | |
415 | } | |
416 | } | |
417 | ||
133672ef SF |
418 | |
419 | /* | |
420 | * | |
421 | * Send an SMB Request. No response info (other than return code) | |
422 | * needs to be parsed. | |
423 | * | |
424 | * flags indicate the type of request buffer and how long to wait | |
425 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
426 | * | |
427 | */ | |
428 | int | |
429 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
430 | struct smb_hdr *in_buf, int flags) | |
431 | { | |
432 | int rc; | |
433 | struct kvec iov[1]; | |
434 | int resp_buf_type; | |
435 | ||
436 | iov[0].iov_base = (char *)in_buf; | |
437 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
438 | flags |= CIFS_NO_RESP; | |
439 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
440 | #ifdef CONFIG_CIFS_DEBUG2 | |
441 | cFYI(1, ("SendRcvNoR flags %d rc %d", flags, rc)); | |
442 | #endif | |
443 | return rc; | |
444 | } | |
445 | ||
7ee1af76 | 446 | int |
79a58d1f SF |
447 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
448 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 449 | const int flags) |
7ee1af76 JA |
450 | { |
451 | int rc = 0; | |
133672ef | 452 | int long_op; |
7ee1af76 JA |
453 | unsigned int receive_len; |
454 | unsigned long timeout; | |
455 | struct mid_q_entry *midQ; | |
456 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 457 | |
133672ef SF |
458 | long_op = flags & CIFS_TIMEOUT_MASK; |
459 | ||
7ee1af76 JA |
460 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
461 | ||
462 | if ((ses == NULL) || (ses->server == NULL)) { | |
463 | cifs_small_buf_release(in_buf); | |
79a58d1f | 464 | cERROR(1, ("Null session")); |
7ee1af76 JA |
465 | return -EIO; |
466 | } | |
467 | ||
79a58d1f | 468 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
469 | cifs_small_buf_release(in_buf); |
470 | return -ENOENT; | |
471 | } | |
472 | ||
79a58d1f | 473 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
474 | to the same server. We may make this configurable later or |
475 | use ses->maxReq */ | |
476 | ||
477 | rc = wait_for_free_request(ses, long_op); | |
478 | if (rc) { | |
479 | cifs_small_buf_release(in_buf); | |
480 | return rc; | |
481 | } | |
482 | ||
79a58d1f | 483 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
484 | and avoid races inside tcp sendmsg code that could cause corruption |
485 | of smb data */ | |
486 | ||
79a58d1f | 487 | down(&ses->server->tcpSem); |
7ee1af76 JA |
488 | |
489 | rc = allocate_mid(ses, in_buf, &midQ); | |
490 | if (rc) { | |
1da177e4 | 491 | up(&ses->server->tcpSem); |
4b8f930f | 492 | cifs_small_buf_release(in_buf); |
7ee1af76 | 493 | /* Update # of requests on wire to server */ |
79a58d1f | 494 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
495 | wake_up(&ses->server->request_q); |
496 | return rc; | |
1da177e4 | 497 | } |
79a58d1f | 498 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
499 | |
500 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
501 | #ifdef CONFIG_CIFS_STATS2 |
502 | atomic_inc(&ses->server->inSend); | |
503 | #endif | |
3e84469d | 504 | rc = smb_send2(ses->server->ssocket, iov, n_vec, |
d6e04ae6 | 505 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
131afd0b SF |
506 | #ifdef CONFIG_CIFS_STATS2 |
507 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 508 | midQ->when_sent = jiffies; |
131afd0b | 509 | #endif |
7ee1af76 JA |
510 | |
511 | up(&ses->server->tcpSem); | |
512 | cifs_small_buf_release(in_buf); | |
513 | ||
79a58d1f | 514 | if (rc < 0) |
7ee1af76 | 515 | goto out; |
4b8f930f | 516 | |
133672ef SF |
517 | if (long_op == CIFS_STD_OP) |
518 | timeout = 15 * HZ; | |
519 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 520 | timeout = 180 * HZ; |
133672ef | 521 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 522 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 523 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
524 | else if (long_op == CIFS_ASYNC_OP) |
525 | goto out; | |
526 | else if (long_op == CIFS_BLOCKING_OP) | |
527 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
528 | else { | |
529 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
530 | rc = -EIO; | |
531 | goto out; | |
532 | } | |
7ee1af76 | 533 | |
79a58d1f | 534 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
535 | due to last connection to this server being unmounted */ |
536 | if (signal_pending(current)) { | |
537 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 538 | but we still give response a chance to complete */ |
d6e04ae6 | 539 | timeout = 2 * HZ; |
79a58d1f | 540 | } |
d6e04ae6 SF |
541 | |
542 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 543 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
544 | |
545 | spin_lock(&GlobalMid_Lock); | |
546 | if (midQ->resp_buf) { | |
547 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 548 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 549 | } else { |
79a58d1f | 550 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 551 | midQ->command, midQ->mid)); |
79a58d1f SF |
552 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
553 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
554 | rc = -EHOSTDOWN; |
555 | else { | |
556 | ses->server->tcpStatus = CifsNeedReconnect; | |
557 | midQ->midState = MID_RETRY_NEEDED; | |
558 | } | |
559 | } | |
560 | ||
561 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 562 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 563 | rc = -EAGAIN; |
79a58d1f | 564 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
565 | } else { |
566 | rc = -EIO; | |
567 | } | |
568 | } | |
569 | spin_unlock(&GlobalMid_Lock); | |
570 | DeleteMidQEntry(midQ); | |
7ee1af76 | 571 | /* Update # of requests on wire to server */ |
79a58d1f | 572 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 573 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
574 | return rc; |
575 | } | |
50c2f753 | 576 | |
d6e04ae6 SF |
577 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
578 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
579 | receive_len, xid)); | |
580 | rc = -EIO; | |
581 | } else { /* rcvd frame is ok */ | |
79a58d1f | 582 | if (midQ->resp_buf && |
d6e04ae6 | 583 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
84afc29b | 584 | |
ec637e3f | 585 | iov[0].iov_base = (char *)midQ->resp_buf; |
79a58d1f | 586 | if (midQ->largeBuf) |
ec637e3f SF |
587 | *pRespBufType = CIFS_LARGE_BUFFER; |
588 | else | |
589 | *pRespBufType = CIFS_SMALL_BUFFER; | |
590 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 591 | |
ec637e3f | 592 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 | 593 | /* convert the length into a more usable form */ |
79a58d1f | 594 | if ((receive_len > 24) && |
d6e04ae6 SF |
595 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
596 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 597 | rc = cifs_verify_signature(midQ->resp_buf, |
b609f06a | 598 | &ses->server->mac_signing_key, |
d6e04ae6 | 599 | midQ->sequence_number+1); |
79a58d1f SF |
600 | if (rc) { |
601 | cERROR(1, ("Unexpected SMB signature")); | |
d6e04ae6 SF |
602 | /* BB FIXME add code to kill session */ |
603 | } | |
604 | } | |
605 | ||
d6e04ae6 | 606 | /* BB special case reconnect tid and uid here? */ |
133672ef SF |
607 | rc = map_smb_to_linux_error(midQ->resp_buf, |
608 | flags & CIFS_LOG_ERROR); | |
d6e04ae6 SF |
609 | |
610 | /* convert ByteCount if necessary */ | |
26f57364 SF |
611 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
612 | /* do not count RFC1001 header */ + | |
ec637e3f | 613 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
79a58d1f | 614 | BCC(midQ->resp_buf) = |
ec637e3f | 615 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
133672ef SF |
616 | if ((flags & CIFS_NO_RESP) == 0) |
617 | midQ->resp_buf = NULL; /* mark it so buf will | |
618 | not be freed by | |
619 | DeleteMidQEntry */ | |
d6e04ae6 SF |
620 | } else { |
621 | rc = -EIO; | |
79a58d1f | 622 | cFYI(1, ("Bad MID state?")); |
d6e04ae6 SF |
623 | } |
624 | } | |
1da177e4 | 625 | |
7ee1af76 | 626 | out: |
7ee1af76 | 627 | DeleteMidQEntry(midQ); |
79a58d1f | 628 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 629 | wake_up(&ses->server->request_q); |
1da177e4 | 630 | |
d6e04ae6 SF |
631 | return rc; |
632 | } | |
1da177e4 LT |
633 | |
634 | int | |
635 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
636 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
637 | int *pbytes_returned, const int long_op) | |
638 | { | |
639 | int rc = 0; | |
640 | unsigned int receive_len; | |
641 | unsigned long timeout; | |
642 | struct mid_q_entry *midQ; | |
643 | ||
644 | if (ses == NULL) { | |
79a58d1f | 645 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
646 | return -EIO; |
647 | } | |
79a58d1f SF |
648 | if (ses->server == NULL) { |
649 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
650 | return -EIO; |
651 | } | |
652 | ||
79a58d1f | 653 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
654 | return -ENOENT; |
655 | ||
79a58d1f | 656 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
657 | to the same server. We may make this configurable later or |
658 | use ses->maxReq */ | |
1da177e4 | 659 | |
7ee1af76 JA |
660 | rc = wait_for_free_request(ses, long_op); |
661 | if (rc) | |
662 | return rc; | |
663 | ||
79a58d1f | 664 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
665 | and avoid races inside tcp sendmsg code that could cause corruption |
666 | of smb data */ | |
667 | ||
79a58d1f | 668 | down(&ses->server->tcpSem); |
1da177e4 | 669 | |
7ee1af76 JA |
670 | rc = allocate_mid(ses, in_buf, &midQ); |
671 | if (rc) { | |
1da177e4 | 672 | up(&ses->server->tcpSem); |
7ee1af76 | 673 | /* Update # of requests on wire to server */ |
79a58d1f | 674 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
675 | wake_up(&ses->server->request_q); |
676 | return rc; | |
1da177e4 LT |
677 | } |
678 | ||
679 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
26a21b98 | 680 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
1da177e4 LT |
681 | in_buf->smb_buf_length)); |
682 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
683 | up(&ses->server->tcpSem); |
684 | /* Update # of requests on wire to server */ | |
79a58d1f | 685 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 686 | wake_up(&ses->server->request_q); |
1da177e4 LT |
687 | return -EIO; |
688 | } | |
689 | ||
ad009ac9 | 690 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
691 | |
692 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
693 | #ifdef CONFIG_CIFS_STATS2 |
694 | atomic_inc(&ses->server->inSend); | |
695 | #endif | |
1da177e4 LT |
696 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
697 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
131afd0b SF |
698 | #ifdef CONFIG_CIFS_STATS2 |
699 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 700 | midQ->when_sent = jiffies; |
131afd0b | 701 | #endif |
7ee1af76 JA |
702 | up(&ses->server->tcpSem); |
703 | ||
79a58d1f | 704 | if (rc < 0) |
7ee1af76 JA |
705 | goto out; |
706 | ||
133672ef SF |
707 | if (long_op == CIFS_STD_OP) |
708 | timeout = 15 * HZ; | |
709 | /* wait for 15 seconds or until woken up due to response arriving or | |
710 | due to last connection to this server being unmounted */ | |
711 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 712 | goto out; |
133672ef | 713 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 714 | timeout = 180 * HZ; |
133672ef | 715 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 716 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 717 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
718 | else if (long_op == CIFS_BLOCKING_OP) |
719 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
720 | else { | |
721 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
722 | rc = -EIO; | |
723 | goto out; | |
724 | } | |
725 | ||
1da177e4 LT |
726 | if (signal_pending(current)) { |
727 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 728 | but we still give response a chance to complete */ |
1da177e4 | 729 | timeout = 2 * HZ; |
79a58d1f | 730 | } |
1da177e4 LT |
731 | |
732 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 733 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
734 | |
735 | spin_lock(&GlobalMid_Lock); | |
736 | if (midQ->resp_buf) { | |
737 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 738 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 739 | } else { |
79a58d1f | 740 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 741 | midQ->command, midQ->mid)); |
79a58d1f SF |
742 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
743 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
744 | rc = -EHOSTDOWN; |
745 | else { | |
746 | ses->server->tcpStatus = CifsNeedReconnect; | |
747 | midQ->midState = MID_RETRY_NEEDED; | |
748 | } | |
749 | } | |
750 | ||
751 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 752 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 753 | rc = -EAGAIN; |
79a58d1f | 754 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
755 | } else { |
756 | rc = -EIO; | |
757 | } | |
758 | } | |
759 | spin_unlock(&GlobalMid_Lock); | |
760 | DeleteMidQEntry(midQ); | |
7ee1af76 | 761 | /* Update # of requests on wire to server */ |
79a58d1f | 762 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 763 | wake_up(&ses->server->request_q); |
1da177e4 LT |
764 | return rc; |
765 | } | |
50c2f753 | 766 | |
1da177e4 | 767 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 768 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
769 | receive_len, xid)); |
770 | rc = -EIO; | |
771 | } else { /* 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 */ | |
79a58d1f | 782 | if ((receive_len > 24) && |
ad009ac9 SF |
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); |
79a58d1f SF |
788 | if (rc) { |
789 | cERROR(1, ("Unexpected SMB signature")); | |
275cde1a | 790 | /* BB FIXME add code to kill session */ |
ad009ac9 | 791 | } |
1da177e4 LT |
792 | } |
793 | ||
794 | *pbytes_returned = out_buf->smb_buf_length; | |
795 | ||
ad009ac9 | 796 | /* BB special case reconnect tid and uid here? */ |
a761ac57 | 797 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 LT |
798 | |
799 | /* convert ByteCount if necessary */ | |
26f57364 SF |
800 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
801 | /* do not count RFC1001 header */ + | |
1da177e4 | 802 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
0f2b27c4 | 803 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
804 | } else { |
805 | rc = -EIO; | |
79a58d1f | 806 | cERROR(1, ("Bad MID state?")); |
1da177e4 LT |
807 | } |
808 | } | |
7ee1af76 JA |
809 | |
810 | out: | |
1da177e4 | 811 | DeleteMidQEntry(midQ); |
79a58d1f | 812 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 813 | wake_up(&ses->server->request_q); |
1da177e4 | 814 | |
7ee1af76 JA |
815 | return rc; |
816 | } | |
1da177e4 | 817 | |
7ee1af76 JA |
818 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
819 | ||
820 | static int | |
821 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
822 | struct mid_q_entry *midQ) | |
823 | { | |
824 | int rc = 0; | |
825 | struct cifsSesInfo *ses = tcon->ses; | |
826 | __u16 mid = in_buf->Mid; | |
827 | ||
828 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
829 | in_buf->Mid = mid; | |
79a58d1f | 830 | down(&ses->server->tcpSem); |
7ee1af76 JA |
831 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
832 | if (rc) { | |
833 | up(&ses->server->tcpSem); | |
834 | return rc; | |
835 | } | |
836 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
837 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
838 | up(&ses->server->tcpSem); | |
1da177e4 | 839 | return rc; |
7ee1af76 JA |
840 | } |
841 | ||
842 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
843 | blocking lock to return. */ | |
844 | ||
845 | static int | |
846 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
847 | struct smb_hdr *in_buf, | |
848 | struct smb_hdr *out_buf) | |
849 | { | |
850 | int bytes_returned; | |
851 | struct cifsSesInfo *ses = tcon->ses; | |
852 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
853 | ||
854 | /* We just modify the current in_buf to change | |
855 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
856 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
857 | LOCKING_ANDX_CANCEL_LOCK. */ | |
858 | ||
859 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
860 | pSMB->Timeout = 0; | |
861 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
862 | ||
863 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 864 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
865 | } |
866 | ||
867 | int | |
868 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
869 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
870 | int *pbytes_returned) | |
871 | { | |
872 | int rc = 0; | |
873 | int rstart = 0; | |
874 | unsigned int receive_len; | |
875 | struct mid_q_entry *midQ; | |
876 | struct cifsSesInfo *ses; | |
877 | ||
878 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 879 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
880 | return -EIO; |
881 | } | |
882 | ses = tcon->ses; | |
883 | ||
79a58d1f SF |
884 | if (ses->server == NULL) { |
885 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
886 | return -EIO; |
887 | } | |
888 | ||
79a58d1f | 889 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
890 | return -ENOENT; |
891 | ||
79a58d1f | 892 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
893 | to the same server. We may make this configurable later or |
894 | use ses->maxReq */ | |
895 | ||
133672ef | 896 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
897 | if (rc) |
898 | return rc; | |
899 | ||
79a58d1f | 900 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
901 | and avoid races inside tcp sendmsg code that could cause corruption |
902 | of smb data */ | |
903 | ||
79a58d1f | 904 | down(&ses->server->tcpSem); |
7ee1af76 JA |
905 | |
906 | rc = allocate_mid(ses, in_buf, &midQ); | |
907 | if (rc) { | |
908 | up(&ses->server->tcpSem); | |
909 | return rc; | |
910 | } | |
911 | ||
912 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
913 | up(&ses->server->tcpSem); | |
914 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
915 | in_buf->smb_buf_length)); | |
916 | DeleteMidQEntry(midQ); | |
917 | return -EIO; | |
918 | } | |
919 | ||
920 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
1da177e4 | 921 | |
7ee1af76 JA |
922 | midQ->midState = MID_REQUEST_SUBMITTED; |
923 | #ifdef CONFIG_CIFS_STATS2 | |
924 | atomic_inc(&ses->server->inSend); | |
925 | #endif | |
926 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
927 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
928 | #ifdef CONFIG_CIFS_STATS2 | |
929 | atomic_dec(&ses->server->inSend); | |
930 | midQ->when_sent = jiffies; | |
931 | #endif | |
1da177e4 | 932 | up(&ses->server->tcpSem); |
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; | |
1014 | } else { /* rcvd frame is ok */ | |
1015 | ||
1016 | if (midQ->resp_buf && out_buf | |
1017 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
1018 | out_buf->smb_buf_length = receive_len; | |
1019 | memcpy((char *)out_buf + 4, | |
1020 | (char *)midQ->resp_buf + 4, | |
1021 | receive_len); | |
1022 | ||
1023 | dump_smb(out_buf, 92); | |
1024 | /* convert the length into a more usable form */ | |
79a58d1f | 1025 | if ((receive_len > 24) && |
7ee1af76 JA |
1026 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
1027 | SECMODE_SIGN_ENABLED))) { | |
1028 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 1029 | &ses->server->mac_signing_key, |
7ee1af76 | 1030 | midQ->sequence_number+1); |
79a58d1f SF |
1031 | if (rc) { |
1032 | cERROR(1, ("Unexpected SMB signature")); | |
7ee1af76 JA |
1033 | /* BB FIXME add code to kill session */ |
1034 | } | |
1035 | } | |
1036 | ||
1037 | *pbytes_returned = out_buf->smb_buf_length; | |
1038 | ||
1039 | /* BB special case reconnect tid and uid here? */ | |
a761ac57 | 1040 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 | 1041 | |
7ee1af76 | 1042 | /* convert ByteCount if necessary */ |
26f57364 SF |
1043 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
1044 | /* do not count RFC1001 header */ + | |
7ee1af76 JA |
1045 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
1046 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1047 | } else { | |
1048 | rc = -EIO; | |
79a58d1f | 1049 | cERROR(1, ("Bad MID state?")); |
7ee1af76 JA |
1050 | } |
1051 | } | |
1052 | DeleteMidQEntry(midQ); | |
1053 | if (rstart && rc == -EACCES) | |
1054 | return -ERESTARTSYS; | |
1da177e4 LT |
1055 | return rc; |
1056 | } |