Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/delay.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/processor.h> | |
30 | #include <linux/mempool.h> | |
31 | #include "cifspdu.h" | |
32 | #include "cifsglob.h" | |
33 | #include "cifsproto.h" | |
34 | #include "cifs_debug.h" | |
50c2f753 | 35 | |
1da177e4 | 36 | extern mempool_t *cifs_mid_poolp; |
e18b890b | 37 | extern struct kmem_cache *cifs_oplock_cachep; |
1da177e4 LT |
38 | |
39 | static struct mid_q_entry * | |
7ee1af76 | 40 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct cifsSesInfo *ses) |
1da177e4 LT |
41 | { |
42 | struct mid_q_entry *temp; | |
43 | ||
44 | if (ses == NULL) { | |
275cde1a | 45 | cERROR(1, ("Null session passed in to AllocMidQEntry")); |
1da177e4 LT |
46 | return NULL; |
47 | } | |
48 | if (ses->server == NULL) { | |
49 | cERROR(1, ("Null TCP session in AllocMidQEntry")); | |
50 | return NULL; | |
51 | } | |
50c2f753 | 52 | |
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 | ||
17680356 | 268 | i = 0; |
3e84469d SF |
269 | while (total_len) { |
270 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
271 | n_vec - first_vec, total_len); | |
1da177e4 LT |
272 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
273 | i++; | |
79a58d1f | 274 | if (i >= 14) { |
1da177e4 | 275 | cERROR(1, |
68058e75 | 276 | ("sends on sock %p stuck for 15 seconds", |
1da177e4 LT |
277 | ssocket)); |
278 | rc = -EAGAIN; | |
279 | break; | |
280 | } | |
68058e75 | 281 | msleep(1 << i); |
1da177e4 LT |
282 | continue; |
283 | } | |
79a58d1f | 284 | if (rc < 0) |
1da177e4 | 285 | break; |
3e84469d SF |
286 | |
287 | if (rc >= total_len) { | |
288 | WARN_ON(rc > total_len); | |
289 | break; | |
290 | } | |
79a58d1f | 291 | if (rc == 0) { |
3e84469d SF |
292 | /* should never happen, letting socket clear before |
293 | retrying is our only obvious option here */ | |
79a58d1f | 294 | cERROR(1, ("tcp sent no data")); |
3e84469d SF |
295 | msleep(500); |
296 | continue; | |
d6e04ae6 | 297 | } |
3e84469d | 298 | total_len -= rc; |
68058e75 | 299 | /* the line below resets i */ |
3e84469d SF |
300 | for (i = first_vec; i < n_vec; i++) { |
301 | if (iov[i].iov_len) { | |
302 | if (rc > iov[i].iov_len) { | |
303 | rc -= iov[i].iov_len; | |
304 | iov[i].iov_len = 0; | |
305 | } else { | |
306 | iov[i].iov_base += rc; | |
307 | iov[i].iov_len -= rc; | |
308 | first_vec = i; | |
309 | break; | |
310 | } | |
311 | } | |
d6e04ae6 | 312 | } |
5e1253b5 | 313 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
314 | } |
315 | ||
316 | if (rc < 0) { | |
79a58d1f | 317 | cERROR(1, ("Error %d sending data on socket to server", rc)); |
3e84469d | 318 | } else |
1da177e4 | 319 | rc = 0; |
1da177e4 | 320 | |
7ee1af76 JA |
321 | /* Don't want to modify the buffer as a |
322 | side effect of this call. */ | |
323 | smb_buffer->smb_buf_length = smb_buf_length; | |
324 | ||
1da177e4 LT |
325 | return rc; |
326 | } | |
327 | ||
7ee1af76 | 328 | static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op) |
1da177e4 | 329 | { |
133672ef | 330 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 LT |
331 | /* oplock breaks must not be held up */ |
332 | atomic_inc(&ses->server->inFlight); | |
333 | } else { | |
79a58d1f SF |
334 | spin_lock(&GlobalMid_Lock); |
335 | while (1) { | |
336 | if (atomic_read(&ses->server->inFlight) >= | |
d6e04ae6 | 337 | cifs_max_pending){ |
1da177e4 | 338 | spin_unlock(&GlobalMid_Lock); |
131afd0b SF |
339 | #ifdef CONFIG_CIFS_STATS2 |
340 | atomic_inc(&ses->server->num_waiters); | |
341 | #endif | |
1da177e4 LT |
342 | wait_event(ses->server->request_q, |
343 | atomic_read(&ses->server->inFlight) | |
344 | < cifs_max_pending); | |
131afd0b SF |
345 | #ifdef CONFIG_CIFS_STATS2 |
346 | atomic_dec(&ses->server->num_waiters); | |
347 | #endif | |
1da177e4 LT |
348 | spin_lock(&GlobalMid_Lock); |
349 | } else { | |
79a58d1f | 350 | if (ses->server->tcpStatus == CifsExiting) { |
1da177e4 LT |
351 | spin_unlock(&GlobalMid_Lock); |
352 | return -ENOENT; | |
353 | } | |
354 | ||
79a58d1f SF |
355 | /* can not count locking commands against total |
356 | as they are allowed to block on server */ | |
50c2f753 | 357 | |
1da177e4 | 358 | /* update # of requests on the wire to server */ |
133672ef | 359 | if (long_op != CIFS_BLOCKING_OP) |
1da177e4 | 360 | atomic_inc(&ses->server->inFlight); |
1da177e4 LT |
361 | spin_unlock(&GlobalMid_Lock); |
362 | break; | |
363 | } | |
364 | } | |
365 | } | |
7ee1af76 JA |
366 | return 0; |
367 | } | |
1da177e4 | 368 | |
7ee1af76 JA |
369 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
370 | struct mid_q_entry **ppmidQ) | |
371 | { | |
1da177e4 | 372 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 373 | return -ENOENT; |
1da177e4 | 374 | } else if (ses->server->tcpStatus == CifsNeedReconnect) { |
79a58d1f | 375 | cFYI(1, ("tcp session dead - return to caller to retry")); |
7ee1af76 | 376 | return -EAGAIN; |
1da177e4 LT |
377 | } else if (ses->status != CifsGood) { |
378 | /* check if SMB session is bad because we are setting it up */ | |
79a58d1f | 379 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 380 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 381 | return -EAGAIN; |
ad7a2926 | 382 | /* else ok - we are setting up session */ |
1da177e4 | 383 | } |
7ee1af76 | 384 | *ppmidQ = AllocMidQEntry(in_buf, ses); |
26f57364 | 385 | if (*ppmidQ == NULL) |
7ee1af76 | 386 | return -ENOMEM; |
7ee1af76 JA |
387 | return 0; |
388 | } | |
389 | ||
79a58d1f | 390 | static int wait_for_response(struct cifsSesInfo *ses, |
7ee1af76 JA |
391 | struct mid_q_entry *midQ, |
392 | unsigned long timeout, | |
393 | unsigned long time_to_wait) | |
394 | { | |
395 | unsigned long curr_timeout; | |
396 | ||
397 | for (;;) { | |
398 | curr_timeout = timeout + jiffies; | |
399 | wait_event(ses->server->response_q, | |
79a58d1f SF |
400 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
401 | time_after(jiffies, curr_timeout) || | |
7ee1af76 JA |
402 | ((ses->server->tcpStatus != CifsGood) && |
403 | (ses->server->tcpStatus != CifsNew))); | |
404 | ||
405 | if (time_after(jiffies, curr_timeout) && | |
406 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
407 | ((ses->server->tcpStatus == CifsGood) || | |
408 | (ses->server->tcpStatus == CifsNew))) { | |
409 | ||
410 | unsigned long lrt; | |
411 | ||
412 | /* We timed out. Is the server still | |
413 | sending replies ? */ | |
414 | spin_lock(&GlobalMid_Lock); | |
415 | lrt = ses->server->lstrp; | |
416 | spin_unlock(&GlobalMid_Lock); | |
417 | ||
418 | /* Calculate time_to_wait past last receive time. | |
79a58d1f | 419 | Although we prefer not to time out if the |
7ee1af76 | 420 | server is still responding - we will time |
79a58d1f | 421 | out if the server takes more than 15 (or 45 |
7ee1af76 | 422 | or 180) seconds to respond to this request |
79a58d1f | 423 | and has not responded to any request from |
7ee1af76 JA |
424 | other threads on the client within 10 seconds */ |
425 | lrt += time_to_wait; | |
426 | if (time_after(jiffies, lrt)) { | |
427 | /* No replies for time_to_wait. */ | |
79a58d1f | 428 | cERROR(1, ("server not responding")); |
7ee1af76 JA |
429 | return -1; |
430 | } | |
431 | } else { | |
432 | return 0; | |
433 | } | |
434 | } | |
435 | } | |
436 | ||
133672ef SF |
437 | |
438 | /* | |
439 | * | |
440 | * Send an SMB Request. No response info (other than return code) | |
441 | * needs to be parsed. | |
442 | * | |
443 | * flags indicate the type of request buffer and how long to wait | |
444 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
445 | * | |
446 | */ | |
447 | int | |
448 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
449 | struct smb_hdr *in_buf, int flags) | |
450 | { | |
451 | int rc; | |
452 | struct kvec iov[1]; | |
453 | int resp_buf_type; | |
454 | ||
455 | iov[0].iov_base = (char *)in_buf; | |
456 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
457 | flags |= CIFS_NO_RESP; | |
458 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
90c81e0b SF |
459 | cFYI(DBG2, ("SendRcvNoRsp flags %d rc %d", flags, rc)); |
460 | ||
133672ef SF |
461 | return rc; |
462 | } | |
463 | ||
7ee1af76 | 464 | int |
79a58d1f SF |
465 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
466 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 467 | const int flags) |
7ee1af76 JA |
468 | { |
469 | int rc = 0; | |
133672ef | 470 | int long_op; |
7ee1af76 JA |
471 | unsigned int receive_len; |
472 | unsigned long timeout; | |
473 | struct mid_q_entry *midQ; | |
474 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 475 | |
133672ef SF |
476 | long_op = flags & CIFS_TIMEOUT_MASK; |
477 | ||
7ee1af76 JA |
478 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
479 | ||
480 | if ((ses == NULL) || (ses->server == NULL)) { | |
481 | cifs_small_buf_release(in_buf); | |
79a58d1f | 482 | cERROR(1, ("Null session")); |
7ee1af76 JA |
483 | return -EIO; |
484 | } | |
485 | ||
79a58d1f | 486 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
487 | cifs_small_buf_release(in_buf); |
488 | return -ENOENT; | |
489 | } | |
490 | ||
79a58d1f | 491 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
492 | to the same server. We may make this configurable later or |
493 | use ses->maxReq */ | |
494 | ||
495 | rc = wait_for_free_request(ses, long_op); | |
496 | if (rc) { | |
497 | cifs_small_buf_release(in_buf); | |
498 | return rc; | |
499 | } | |
500 | ||
79a58d1f | 501 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
502 | and avoid races inside tcp sendmsg code that could cause corruption |
503 | of smb data */ | |
504 | ||
79a58d1f | 505 | down(&ses->server->tcpSem); |
7ee1af76 JA |
506 | |
507 | rc = allocate_mid(ses, in_buf, &midQ); | |
508 | if (rc) { | |
1da177e4 | 509 | up(&ses->server->tcpSem); |
4b8f930f | 510 | cifs_small_buf_release(in_buf); |
7ee1af76 | 511 | /* Update # of requests on wire to server */ |
79a58d1f | 512 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
513 | wake_up(&ses->server->request_q); |
514 | return rc; | |
1da177e4 | 515 | } |
79a58d1f | 516 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
1da177e4 LT |
517 | |
518 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
519 | #ifdef CONFIG_CIFS_STATS2 |
520 | atomic_inc(&ses->server->inSend); | |
521 | #endif | |
3e84469d | 522 | rc = smb_send2(ses->server->ssocket, iov, n_vec, |
d6e04ae6 | 523 | (struct sockaddr *) &(ses->server->addr.sockAddr)); |
131afd0b SF |
524 | #ifdef CONFIG_CIFS_STATS2 |
525 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 526 | midQ->when_sent = jiffies; |
131afd0b | 527 | #endif |
7ee1af76 JA |
528 | |
529 | up(&ses->server->tcpSem); | |
530 | cifs_small_buf_release(in_buf); | |
531 | ||
79a58d1f | 532 | if (rc < 0) |
7ee1af76 | 533 | goto out; |
4b8f930f | 534 | |
133672ef SF |
535 | if (long_op == CIFS_STD_OP) |
536 | timeout = 15 * HZ; | |
537 | else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */ | |
37c0eb46 | 538 | timeout = 180 * HZ; |
133672ef | 539 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 540 | timeout = 45 * HZ; /* should be greater than |
d6e04ae6 | 541 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
542 | else if (long_op == CIFS_ASYNC_OP) |
543 | goto out; | |
544 | else if (long_op == CIFS_BLOCKING_OP) | |
545 | timeout = 0x7FFFFFFF; /* large, but not so large as to wrap */ | |
546 | else { | |
547 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
548 | rc = -EIO; | |
549 | goto out; | |
550 | } | |
7ee1af76 | 551 | |
79a58d1f | 552 | /* wait for 15 seconds or until woken up due to response arriving or |
d6e04ae6 SF |
553 | due to last connection to this server being unmounted */ |
554 | if (signal_pending(current)) { | |
555 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 556 | but we still give response a chance to complete */ |
d6e04ae6 | 557 | timeout = 2 * HZ; |
79a58d1f | 558 | } |
d6e04ae6 SF |
559 | |
560 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 561 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
d6e04ae6 SF |
562 | |
563 | spin_lock(&GlobalMid_Lock); | |
564 | if (midQ->resp_buf) { | |
565 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 566 | receive_len = midQ->resp_buf->smb_buf_length; |
d6e04ae6 | 567 | } else { |
79a58d1f | 568 | cERROR(1, ("No response to cmd %d mid %d", |
37c0eb46 | 569 | midQ->command, midQ->mid)); |
79a58d1f SF |
570 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
571 | if (ses->server->tcpStatus == CifsExiting) | |
d6e04ae6 SF |
572 | rc = -EHOSTDOWN; |
573 | else { | |
574 | ses->server->tcpStatus = CifsNeedReconnect; | |
575 | midQ->midState = MID_RETRY_NEEDED; | |
576 | } | |
577 | } | |
578 | ||
579 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 580 | if (midQ->midState == MID_RETRY_NEEDED) { |
d6e04ae6 | 581 | rc = -EAGAIN; |
79a58d1f | 582 | cFYI(1, ("marking request for retry")); |
d6e04ae6 SF |
583 | } else { |
584 | rc = -EIO; | |
585 | } | |
586 | } | |
587 | spin_unlock(&GlobalMid_Lock); | |
588 | DeleteMidQEntry(midQ); | |
7ee1af76 | 589 | /* Update # of requests on wire to server */ |
79a58d1f | 590 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 591 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
592 | return rc; |
593 | } | |
50c2f753 | 594 | |
d6e04ae6 SF |
595 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
596 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
597 | receive_len, xid)); | |
598 | rc = -EIO; | |
599 | } else { /* rcvd frame is ok */ | |
79a58d1f | 600 | if (midQ->resp_buf && |
d6e04ae6 | 601 | (midQ->midState == MID_RESPONSE_RECEIVED)) { |
84afc29b | 602 | |
ec637e3f | 603 | iov[0].iov_base = (char *)midQ->resp_buf; |
79a58d1f | 604 | if (midQ->largeBuf) |
ec637e3f SF |
605 | *pRespBufType = CIFS_LARGE_BUFFER; |
606 | else | |
607 | *pRespBufType = CIFS_SMALL_BUFFER; | |
608 | iov[0].iov_len = receive_len + 4; | |
d6e04ae6 | 609 | |
ec637e3f | 610 | dump_smb(midQ->resp_buf, 80); |
d6e04ae6 | 611 | /* convert the length into a more usable form */ |
79a58d1f | 612 | if ((receive_len > 24) && |
d6e04ae6 SF |
613 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
614 | SECMODE_SIGN_ENABLED))) { | |
ec637e3f | 615 | rc = cifs_verify_signature(midQ->resp_buf, |
b609f06a | 616 | &ses->server->mac_signing_key, |
d6e04ae6 | 617 | midQ->sequence_number+1); |
79a58d1f SF |
618 | if (rc) { |
619 | cERROR(1, ("Unexpected SMB signature")); | |
d6e04ae6 SF |
620 | /* BB FIXME add code to kill session */ |
621 | } | |
622 | } | |
623 | ||
d6e04ae6 | 624 | /* BB special case reconnect tid and uid here? */ |
133672ef SF |
625 | rc = map_smb_to_linux_error(midQ->resp_buf, |
626 | flags & CIFS_LOG_ERROR); | |
d6e04ae6 SF |
627 | |
628 | /* convert ByteCount if necessary */ | |
26f57364 SF |
629 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
630 | /* do not count RFC1001 header */ + | |
ec637e3f | 631 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) |
79a58d1f | 632 | BCC(midQ->resp_buf) = |
ec637e3f | 633 | le16_to_cpu(BCC_LE(midQ->resp_buf)); |
133672ef SF |
634 | if ((flags & CIFS_NO_RESP) == 0) |
635 | midQ->resp_buf = NULL; /* mark it so buf will | |
636 | not be freed by | |
637 | DeleteMidQEntry */ | |
d6e04ae6 SF |
638 | } else { |
639 | rc = -EIO; | |
79a58d1f | 640 | cFYI(1, ("Bad MID state?")); |
d6e04ae6 SF |
641 | } |
642 | } | |
1da177e4 | 643 | |
7ee1af76 | 644 | out: |
7ee1af76 | 645 | DeleteMidQEntry(midQ); |
79a58d1f | 646 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 647 | wake_up(&ses->server->request_q); |
1da177e4 | 648 | |
d6e04ae6 SF |
649 | return rc; |
650 | } | |
1da177e4 LT |
651 | |
652 | int | |
653 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
654 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
655 | int *pbytes_returned, const int long_op) | |
656 | { | |
657 | int rc = 0; | |
658 | unsigned int receive_len; | |
659 | unsigned long timeout; | |
660 | struct mid_q_entry *midQ; | |
661 | ||
662 | if (ses == NULL) { | |
79a58d1f | 663 | cERROR(1, ("Null smb session")); |
1da177e4 LT |
664 | return -EIO; |
665 | } | |
79a58d1f SF |
666 | if (ses->server == NULL) { |
667 | cERROR(1, ("Null tcp session")); | |
1da177e4 LT |
668 | return -EIO; |
669 | } | |
670 | ||
79a58d1f | 671 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
672 | return -ENOENT; |
673 | ||
79a58d1f | 674 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
675 | to the same server. We may make this configurable later or |
676 | use ses->maxReq */ | |
1da177e4 | 677 | |
7ee1af76 JA |
678 | rc = wait_for_free_request(ses, long_op); |
679 | if (rc) | |
680 | return rc; | |
681 | ||
79a58d1f | 682 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
683 | and avoid races inside tcp sendmsg code that could cause corruption |
684 | of smb data */ | |
685 | ||
79a58d1f | 686 | down(&ses->server->tcpSem); |
1da177e4 | 687 | |
7ee1af76 JA |
688 | rc = allocate_mid(ses, in_buf, &midQ); |
689 | if (rc) { | |
1da177e4 | 690 | up(&ses->server->tcpSem); |
7ee1af76 | 691 | /* Update # of requests on wire to server */ |
79a58d1f | 692 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
693 | wake_up(&ses->server->request_q); |
694 | return rc; | |
1da177e4 LT |
695 | } |
696 | ||
697 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
26a21b98 | 698 | cERROR(1, ("Illegal length, greater than maximum frame, %d", |
1da177e4 LT |
699 | in_buf->smb_buf_length)); |
700 | DeleteMidQEntry(midQ); | |
7ee1af76 JA |
701 | up(&ses->server->tcpSem); |
702 | /* Update # of requests on wire to server */ | |
79a58d1f | 703 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 704 | wake_up(&ses->server->request_q); |
1da177e4 LT |
705 | return -EIO; |
706 | } | |
707 | ||
ad009ac9 | 708 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
1da177e4 LT |
709 | |
710 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
711 | #ifdef CONFIG_CIFS_STATS2 |
712 | atomic_inc(&ses->server->inSend); | |
713 | #endif | |
1da177e4 LT |
714 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, |
715 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
131afd0b SF |
716 | #ifdef CONFIG_CIFS_STATS2 |
717 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 718 | midQ->when_sent = jiffies; |
131afd0b | 719 | #endif |
7ee1af76 JA |
720 | up(&ses->server->tcpSem); |
721 | ||
79a58d1f | 722 | if (rc < 0) |
7ee1af76 JA |
723 | goto out; |
724 | ||
133672ef SF |
725 | if (long_op == CIFS_STD_OP) |
726 | timeout = 15 * HZ; | |
727 | /* wait for 15 seconds or until woken up due to response arriving or | |
728 | due to last connection to this server being unmounted */ | |
729 | else if (long_op == CIFS_ASYNC_OP) | |
7ee1af76 | 730 | goto out; |
133672ef | 731 | else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */ |
37c0eb46 | 732 | timeout = 180 * HZ; |
133672ef | 733 | else if (long_op == CIFS_LONG_OP) |
79a58d1f | 734 | timeout = 45 * HZ; /* should be greater than |
1da177e4 | 735 | servers oplock break timeout (about 43 seconds) */ |
133672ef SF |
736 | else if (long_op == CIFS_BLOCKING_OP) |
737 | timeout = 0x7FFFFFFF; /* large but no so large as to wrap */ | |
738 | else { | |
739 | cERROR(1, ("unknown timeout flag %d", long_op)); | |
740 | rc = -EIO; | |
741 | goto out; | |
742 | } | |
743 | ||
1da177e4 LT |
744 | if (signal_pending(current)) { |
745 | /* if signal pending do not hold up user for full smb timeout | |
8a236264 | 746 | but we still give response a chance to complete */ |
1da177e4 | 747 | timeout = 2 * HZ; |
79a58d1f | 748 | } |
1da177e4 LT |
749 | |
750 | /* No user interrupts in wait - wreaks havoc with performance */ | |
7ee1af76 | 751 | wait_for_response(ses, midQ, timeout, 10 * HZ); |
1da177e4 LT |
752 | |
753 | spin_lock(&GlobalMid_Lock); | |
754 | if (midQ->resp_buf) { | |
755 | spin_unlock(&GlobalMid_Lock); | |
70ca734a | 756 | receive_len = midQ->resp_buf->smb_buf_length; |
1da177e4 | 757 | } else { |
79a58d1f | 758 | cERROR(1, ("No response for cmd %d mid %d", |
37c0eb46 | 759 | midQ->command, midQ->mid)); |
79a58d1f SF |
760 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
761 | if (ses->server->tcpStatus == CifsExiting) | |
1da177e4 LT |
762 | rc = -EHOSTDOWN; |
763 | else { | |
764 | ses->server->tcpStatus = CifsNeedReconnect; | |
765 | midQ->midState = MID_RETRY_NEEDED; | |
766 | } | |
767 | } | |
768 | ||
769 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 770 | if (midQ->midState == MID_RETRY_NEEDED) { |
1da177e4 | 771 | rc = -EAGAIN; |
79a58d1f | 772 | cFYI(1, ("marking request for retry")); |
1da177e4 LT |
773 | } else { |
774 | rc = -EIO; | |
775 | } | |
776 | } | |
777 | spin_unlock(&GlobalMid_Lock); | |
778 | DeleteMidQEntry(midQ); | |
7ee1af76 | 779 | /* Update # of requests on wire to server */ |
79a58d1f | 780 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 781 | wake_up(&ses->server->request_q); |
1da177e4 LT |
782 | return rc; |
783 | } | |
50c2f753 | 784 | |
1da177e4 | 785 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
ad009ac9 | 786 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", |
1da177e4 LT |
787 | receive_len, xid)); |
788 | rc = -EIO; | |
789 | } else { /* rcvd frame is ok */ | |
790 | ||
791 | if (midQ->resp_buf && out_buf | |
792 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
793 | out_buf->smb_buf_length = receive_len; | |
794 | memcpy((char *)out_buf + 4, | |
795 | (char *)midQ->resp_buf + 4, | |
796 | receive_len); | |
797 | ||
798 | dump_smb(out_buf, 92); | |
799 | /* convert the length into a more usable form */ | |
79a58d1f | 800 | if ((receive_len > 24) && |
ad009ac9 SF |
801 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
802 | SECMODE_SIGN_ENABLED))) { | |
803 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 804 | &ses->server->mac_signing_key, |
ad009ac9 | 805 | midQ->sequence_number+1); |
79a58d1f SF |
806 | if (rc) { |
807 | cERROR(1, ("Unexpected SMB signature")); | |
275cde1a | 808 | /* BB FIXME add code to kill session */ |
ad009ac9 | 809 | } |
1da177e4 LT |
810 | } |
811 | ||
812 | *pbytes_returned = out_buf->smb_buf_length; | |
813 | ||
ad009ac9 | 814 | /* BB special case reconnect tid and uid here? */ |
a761ac57 | 815 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 LT |
816 | |
817 | /* convert ByteCount if necessary */ | |
26f57364 SF |
818 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
819 | /* do not count RFC1001 header */ + | |
1da177e4 | 820 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
0f2b27c4 | 821 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); |
1da177e4 LT |
822 | } else { |
823 | rc = -EIO; | |
79a58d1f | 824 | cERROR(1, ("Bad MID state?")); |
1da177e4 LT |
825 | } |
826 | } | |
7ee1af76 JA |
827 | |
828 | out: | |
1da177e4 | 829 | DeleteMidQEntry(midQ); |
79a58d1f | 830 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 831 | wake_up(&ses->server->request_q); |
1da177e4 | 832 | |
7ee1af76 JA |
833 | return rc; |
834 | } | |
1da177e4 | 835 | |
7ee1af76 JA |
836 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
837 | ||
838 | static int | |
839 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
840 | struct mid_q_entry *midQ) | |
841 | { | |
842 | int rc = 0; | |
843 | struct cifsSesInfo *ses = tcon->ses; | |
844 | __u16 mid = in_buf->Mid; | |
845 | ||
846 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
847 | in_buf->Mid = mid; | |
79a58d1f | 848 | down(&ses->server->tcpSem); |
7ee1af76 JA |
849 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
850 | if (rc) { | |
851 | up(&ses->server->tcpSem); | |
852 | return rc; | |
853 | } | |
854 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
855 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
856 | up(&ses->server->tcpSem); | |
1da177e4 | 857 | return rc; |
7ee1af76 JA |
858 | } |
859 | ||
860 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
861 | blocking lock to return. */ | |
862 | ||
863 | static int | |
864 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
865 | struct smb_hdr *in_buf, | |
866 | struct smb_hdr *out_buf) | |
867 | { | |
868 | int bytes_returned; | |
869 | struct cifsSesInfo *ses = tcon->ses; | |
870 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
871 | ||
872 | /* We just modify the current in_buf to change | |
873 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
874 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
875 | LOCKING_ANDX_CANCEL_LOCK. */ | |
876 | ||
877 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
878 | pSMB->Timeout = 0; | |
879 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
880 | ||
881 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 882 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
883 | } |
884 | ||
885 | int | |
886 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
887 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
888 | int *pbytes_returned) | |
889 | { | |
890 | int rc = 0; | |
891 | int rstart = 0; | |
892 | unsigned int receive_len; | |
893 | struct mid_q_entry *midQ; | |
894 | struct cifsSesInfo *ses; | |
895 | ||
896 | if (tcon == NULL || tcon->ses == NULL) { | |
79a58d1f | 897 | cERROR(1, ("Null smb session")); |
7ee1af76 JA |
898 | return -EIO; |
899 | } | |
900 | ses = tcon->ses; | |
901 | ||
79a58d1f SF |
902 | if (ses->server == NULL) { |
903 | cERROR(1, ("Null tcp session")); | |
7ee1af76 JA |
904 | return -EIO; |
905 | } | |
906 | ||
79a58d1f | 907 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
908 | return -ENOENT; |
909 | ||
79a58d1f | 910 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
911 | to the same server. We may make this configurable later or |
912 | use ses->maxReq */ | |
913 | ||
133672ef | 914 | rc = wait_for_free_request(ses, CIFS_BLOCKING_OP); |
7ee1af76 JA |
915 | if (rc) |
916 | return rc; | |
917 | ||
79a58d1f | 918 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
919 | and avoid races inside tcp sendmsg code that could cause corruption |
920 | of smb data */ | |
921 | ||
79a58d1f | 922 | down(&ses->server->tcpSem); |
7ee1af76 JA |
923 | |
924 | rc = allocate_mid(ses, in_buf, &midQ); | |
925 | if (rc) { | |
926 | up(&ses->server->tcpSem); | |
927 | return rc; | |
928 | } | |
929 | ||
930 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { | |
931 | up(&ses->server->tcpSem); | |
932 | cERROR(1, ("Illegal length, greater than maximum frame, %d", | |
933 | in_buf->smb_buf_length)); | |
934 | DeleteMidQEntry(midQ); | |
935 | return -EIO; | |
936 | } | |
937 | ||
938 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); | |
1da177e4 | 939 | |
7ee1af76 JA |
940 | midQ->midState = MID_REQUEST_SUBMITTED; |
941 | #ifdef CONFIG_CIFS_STATS2 | |
942 | atomic_inc(&ses->server->inSend); | |
943 | #endif | |
944 | rc = smb_send(ses->server->ssocket, in_buf, in_buf->smb_buf_length, | |
945 | (struct sockaddr *) &(ses->server->addr.sockAddr)); | |
946 | #ifdef CONFIG_CIFS_STATS2 | |
947 | atomic_dec(&ses->server->inSend); | |
948 | midQ->when_sent = jiffies; | |
949 | #endif | |
1da177e4 | 950 | up(&ses->server->tcpSem); |
7ee1af76 | 951 | |
79a58d1f | 952 | if (rc < 0) { |
7ee1af76 JA |
953 | DeleteMidQEntry(midQ); |
954 | return rc; | |
955 | } | |
956 | ||
957 | /* Wait for a reply - allow signals to interrupt. */ | |
958 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 959 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
960 | ((ses->server->tcpStatus != CifsGood) && |
961 | (ses->server->tcpStatus != CifsNew))); | |
962 | ||
963 | /* Were we interrupted by a signal ? */ | |
964 | if ((rc == -ERESTARTSYS) && | |
965 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
966 | ((ses->server->tcpStatus == CifsGood) || | |
967 | (ses->server->tcpStatus == CifsNew))) { | |
968 | ||
969 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
970 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
971 | blocking lock to return. */ | |
972 | ||
973 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
974 | if (rc) { | |
975 | DeleteMidQEntry(midQ); | |
976 | return rc; | |
977 | } | |
978 | } else { | |
979 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
980 | to cause the blocking lock to return. */ | |
981 | ||
982 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
983 | ||
984 | /* If we get -ENOLCK back the lock may have | |
985 | already been removed. Don't exit in this case. */ | |
986 | if (rc && rc != -ENOLCK) { | |
987 | DeleteMidQEntry(midQ); | |
988 | return rc; | |
989 | } | |
990 | } | |
991 | ||
992 | /* Wait 5 seconds for the response. */ | |
79a58d1f | 993 | if (wait_for_response(ses, midQ, 5 * HZ, 5 * HZ) == 0) { |
7ee1af76 JA |
994 | /* We got the response - restart system call. */ |
995 | rstart = 1; | |
996 | } | |
997 | } | |
998 | ||
999 | spin_lock(&GlobalMid_Lock); | |
1000 | if (midQ->resp_buf) { | |
1001 | spin_unlock(&GlobalMid_Lock); | |
1002 | receive_len = midQ->resp_buf->smb_buf_length; | |
1003 | } else { | |
79a58d1f | 1004 | cERROR(1, ("No response for cmd %d mid %d", |
7ee1af76 | 1005 | midQ->command, midQ->mid)); |
79a58d1f SF |
1006 | if (midQ->midState == MID_REQUEST_SUBMITTED) { |
1007 | if (ses->server->tcpStatus == CifsExiting) | |
7ee1af76 JA |
1008 | rc = -EHOSTDOWN; |
1009 | else { | |
1010 | ses->server->tcpStatus = CifsNeedReconnect; | |
1011 | midQ->midState = MID_RETRY_NEEDED; | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | if (rc != -EHOSTDOWN) { | |
79a58d1f | 1016 | if (midQ->midState == MID_RETRY_NEEDED) { |
7ee1af76 | 1017 | rc = -EAGAIN; |
79a58d1f | 1018 | cFYI(1, ("marking request for retry")); |
7ee1af76 JA |
1019 | } else { |
1020 | rc = -EIO; | |
1021 | } | |
1022 | } | |
1023 | spin_unlock(&GlobalMid_Lock); | |
1024 | DeleteMidQEntry(midQ); | |
1025 | return rc; | |
1da177e4 | 1026 | } |
50c2f753 | 1027 | |
7ee1af76 JA |
1028 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
1029 | cERROR(1, ("Frame too large received. Length: %d Xid: %d", | |
1030 | receive_len, xid)); | |
1031 | rc = -EIO; | |
1032 | } else { /* rcvd frame is ok */ | |
1033 | ||
1034 | if (midQ->resp_buf && out_buf | |
1035 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
1036 | out_buf->smb_buf_length = receive_len; | |
1037 | memcpy((char *)out_buf + 4, | |
1038 | (char *)midQ->resp_buf + 4, | |
1039 | receive_len); | |
1040 | ||
1041 | dump_smb(out_buf, 92); | |
1042 | /* convert the length into a more usable form */ | |
79a58d1f | 1043 | if ((receive_len > 24) && |
7ee1af76 JA |
1044 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | |
1045 | SECMODE_SIGN_ENABLED))) { | |
1046 | rc = cifs_verify_signature(out_buf, | |
b609f06a | 1047 | &ses->server->mac_signing_key, |
7ee1af76 | 1048 | midQ->sequence_number+1); |
79a58d1f SF |
1049 | if (rc) { |
1050 | cERROR(1, ("Unexpected SMB signature")); | |
7ee1af76 JA |
1051 | /* BB FIXME add code to kill session */ |
1052 | } | |
1053 | } | |
1054 | ||
1055 | *pbytes_returned = out_buf->smb_buf_length; | |
1056 | ||
1057 | /* BB special case reconnect tid and uid here? */ | |
a761ac57 | 1058 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); |
1da177e4 | 1059 | |
7ee1af76 | 1060 | /* convert ByteCount if necessary */ |
26f57364 SF |
1061 | if (receive_len >= sizeof(struct smb_hdr) - 4 |
1062 | /* do not count RFC1001 header */ + | |
7ee1af76 JA |
1063 | (2 * out_buf->WordCount) + 2 /* bcc */ ) |
1064 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
1065 | } else { | |
1066 | rc = -EIO; | |
79a58d1f | 1067 | cERROR(1, ("Bad MID state?")); |
7ee1af76 JA |
1068 | } |
1069 | } | |
1070 | DeleteMidQEntry(midQ); | |
1071 | if (rstart && rc == -EACCES) | |
1072 | return -ERESTARTSYS; | |
1da177e4 LT |
1073 | return rc; |
1074 | } |