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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> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/processor.h> | |
31 | #include <linux/mempool.h> | |
32 | #include "cifspdu.h" | |
33 | #include "cifsglob.h" | |
34 | #include "cifsproto.h" | |
35 | #include "cifs_debug.h" | |
50c2f753 | 36 | |
1da177e4 | 37 | extern mempool_t *cifs_mid_poolp; |
1da177e4 | 38 | |
2b84a36c JL |
39 | static void |
40 | wake_up_task(struct mid_q_entry *mid) | |
41 | { | |
42 | wake_up_process(mid->callback_data); | |
43 | } | |
44 | ||
a6827c18 | 45 | struct mid_q_entry * |
24b9b06b | 46 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
47 | { |
48 | struct mid_q_entry *temp; | |
49 | ||
24b9b06b | 50 | if (server == NULL) { |
b6b38f70 | 51 | cERROR(1, "Null TCP session in AllocMidQEntry"); |
1da177e4 LT |
52 | return NULL; |
53 | } | |
50c2f753 | 54 | |
232087cb | 55 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
1da177e4 LT |
56 | if (temp == NULL) |
57 | return temp; | |
58 | else { | |
26f57364 | 59 | memset(temp, 0, sizeof(struct mid_q_entry)); |
1da177e4 LT |
60 | temp->mid = smb_buffer->Mid; /* always LE */ |
61 | temp->pid = current->pid; | |
62 | temp->command = smb_buffer->Command; | |
b6b38f70 | 63 | cFYI(1, "For smb_command %d", temp->command); |
1047abc1 SF |
64 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
65 | /* when mid allocated can be before when sent */ | |
66 | temp->when_alloc = jiffies; | |
2b84a36c JL |
67 | |
68 | /* | |
69 | * The default is for the mid to be synchronous, so the | |
70 | * default callback just wakes up the current task. | |
71 | */ | |
72 | temp->callback = wake_up_task; | |
73 | temp->callback_data = current; | |
1da177e4 LT |
74 | } |
75 | ||
1da177e4 LT |
76 | atomic_inc(&midCount); |
77 | temp->midState = MID_REQUEST_ALLOCATED; | |
1da177e4 LT |
78 | return temp; |
79 | } | |
80 | ||
766fdbb5 | 81 | void |
1da177e4 LT |
82 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
83 | { | |
1047abc1 SF |
84 | #ifdef CONFIG_CIFS_STATS2 |
85 | unsigned long now; | |
86 | #endif | |
1da177e4 | 87 | midEntry->midState = MID_FREE; |
8097531a | 88 | atomic_dec(&midCount); |
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 | ||
ddc8cf8f JL |
112 | static void |
113 | delete_mid(struct mid_q_entry *mid) | |
114 | { | |
115 | spin_lock(&GlobalMid_Lock); | |
116 | list_del(&mid->qhead); | |
117 | spin_unlock(&GlobalMid_Lock); | |
118 | ||
119 | DeleteMidQEntry(mid); | |
120 | } | |
121 | ||
d6e04ae6 | 122 | static int |
0496e02d | 123 | smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) |
1da177e4 LT |
124 | { |
125 | int rc = 0; | |
126 | int i = 0; | |
127 | struct msghdr smb_msg; | |
3e84469d SF |
128 | struct smb_hdr *smb_buffer = iov[0].iov_base; |
129 | unsigned int len = iov[0].iov_len; | |
130 | unsigned int total_len; | |
131 | int first_vec = 0; | |
7ee1af76 | 132 | unsigned int smb_buf_length = smb_buffer->smb_buf_length; |
edf1ae40 | 133 | struct socket *ssocket = server->ssocket; |
50c2f753 | 134 | |
79a58d1f | 135 | if (ssocket == NULL) |
1da177e4 | 136 | return -ENOTSOCK; /* BB eventually add reconnect code here */ |
3e84469d | 137 | |
a9f1b85e | 138 | smb_msg.msg_name = (struct sockaddr *) &server->dstaddr; |
26f57364 | 139 | smb_msg.msg_namelen = sizeof(struct sockaddr); |
1da177e4 LT |
140 | smb_msg.msg_control = NULL; |
141 | smb_msg.msg_controllen = 0; | |
0496e02d | 142 | if (server->noblocksnd) |
edf1ae40 SF |
143 | smb_msg.msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
144 | else | |
145 | smb_msg.msg_flags = MSG_NOSIGNAL; | |
1da177e4 LT |
146 | |
147 | /* smb header is converted in header_assemble. bcc and rest of SMB word | |
79a58d1f SF |
148 | area, and byte area if necessary, is converted to littleendian in |
149 | cifssmb.c and RFC1001 len is converted to bigendian in smb_send | |
1da177e4 LT |
150 | Flags2 is converted in SendReceive */ |
151 | ||
3e84469d SF |
152 | |
153 | total_len = 0; | |
154 | for (i = 0; i < n_vec; i++) | |
155 | total_len += iov[i].iov_len; | |
156 | ||
1da177e4 | 157 | smb_buffer->smb_buf_length = cpu_to_be32(smb_buffer->smb_buf_length); |
b6b38f70 | 158 | cFYI(1, "Sending smb: total_len %d", total_len); |
1da177e4 LT |
159 | dump_smb(smb_buffer, len); |
160 | ||
17680356 | 161 | i = 0; |
3e84469d SF |
162 | while (total_len) { |
163 | rc = kernel_sendmsg(ssocket, &smb_msg, &iov[first_vec], | |
164 | n_vec - first_vec, total_len); | |
1da177e4 LT |
165 | if ((rc == -ENOSPC) || (rc == -EAGAIN)) { |
166 | i++; | |
da505c38 SF |
167 | /* if blocking send we try 3 times, since each can block |
168 | for 5 seconds. For nonblocking we have to try more | |
169 | but wait increasing amounts of time allowing time for | |
170 | socket to clear. The overall time we wait in either | |
171 | case to send on the socket is about 15 seconds. | |
172 | Similarly we wait for 15 seconds for | |
173 | a response from the server in SendReceive[2] | |
174 | for the server to send a response back for | |
175 | most types of requests (except SMB Write | |
176 | past end of file which can be slow, and | |
177 | blocking lock operations). NFS waits slightly longer | |
178 | than CIFS, but this can make it take longer for | |
179 | nonresponsive servers to be detected and 15 seconds | |
180 | is more than enough time for modern networks to | |
181 | send a packet. In most cases if we fail to send | |
182 | after the retries we will kill the socket and | |
183 | reconnect which may clear the network problem. | |
184 | */ | |
185 | if ((i >= 14) || (!server->noblocksnd && (i > 2))) { | |
b6b38f70 JP |
186 | cERROR(1, "sends on sock %p stuck for 15 seconds", |
187 | ssocket); | |
1da177e4 LT |
188 | rc = -EAGAIN; |
189 | break; | |
190 | } | |
68058e75 | 191 | msleep(1 << i); |
1da177e4 LT |
192 | continue; |
193 | } | |
79a58d1f | 194 | if (rc < 0) |
1da177e4 | 195 | break; |
3e84469d | 196 | |
61de800d SF |
197 | if (rc == total_len) { |
198 | total_len = 0; | |
199 | break; | |
200 | } else if (rc > total_len) { | |
b6b38f70 | 201 | cERROR(1, "sent %d requested %d", rc, total_len); |
3e84469d SF |
202 | break; |
203 | } | |
79a58d1f | 204 | if (rc == 0) { |
3e84469d SF |
205 | /* should never happen, letting socket clear before |
206 | retrying is our only obvious option here */ | |
b6b38f70 | 207 | cERROR(1, "tcp sent no data"); |
3e84469d SF |
208 | msleep(500); |
209 | continue; | |
d6e04ae6 | 210 | } |
3e84469d | 211 | total_len -= rc; |
68058e75 | 212 | /* the line below resets i */ |
3e84469d SF |
213 | for (i = first_vec; i < n_vec; i++) { |
214 | if (iov[i].iov_len) { | |
215 | if (rc > iov[i].iov_len) { | |
216 | rc -= iov[i].iov_len; | |
217 | iov[i].iov_len = 0; | |
218 | } else { | |
219 | iov[i].iov_base += rc; | |
220 | iov[i].iov_len -= rc; | |
221 | first_vec = i; | |
222 | break; | |
223 | } | |
224 | } | |
d6e04ae6 | 225 | } |
5e1253b5 | 226 | i = 0; /* in case we get ENOSPC on the next send */ |
1da177e4 LT |
227 | } |
228 | ||
edf1ae40 | 229 | if ((total_len > 0) && (total_len != smb_buf_length + 4)) { |
b6b38f70 JP |
230 | cFYI(1, "partial send (%d remaining), terminating session", |
231 | total_len); | |
edf1ae40 SF |
232 | /* If we have only sent part of an SMB then the next SMB |
233 | could be taken as the remainder of this one. We need | |
234 | to kill the socket so the server throws away the partial | |
235 | SMB */ | |
236 | server->tcpStatus = CifsNeedReconnect; | |
237 | } | |
238 | ||
1da177e4 | 239 | if (rc < 0) { |
b6b38f70 | 240 | cERROR(1, "Error %d sending data on socket to server", rc); |
3e84469d | 241 | } else |
1da177e4 | 242 | rc = 0; |
1da177e4 | 243 | |
7ee1af76 JA |
244 | /* Don't want to modify the buffer as a |
245 | side effect of this call. */ | |
246 | smb_buffer->smb_buf_length = smb_buf_length; | |
247 | ||
1da177e4 LT |
248 | return rc; |
249 | } | |
250 | ||
0496e02d JL |
251 | int |
252 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
253 | unsigned int smb_buf_length) | |
254 | { | |
255 | struct kvec iov; | |
256 | ||
257 | iov.iov_base = smb_buffer; | |
258 | iov.iov_len = smb_buf_length + 4; | |
259 | ||
260 | return smb_sendv(server, &iov, 1); | |
261 | } | |
262 | ||
c5797a94 JL |
263 | static int wait_for_free_request(struct TCP_Server_Info *server, |
264 | const int long_op) | |
1da177e4 | 265 | { |
133672ef | 266 | if (long_op == CIFS_ASYNC_OP) { |
1da177e4 | 267 | /* oplock breaks must not be held up */ |
c5797a94 | 268 | atomic_inc(&server->inFlight); |
27a97a61 VL |
269 | return 0; |
270 | } | |
271 | ||
272 | spin_lock(&GlobalMid_Lock); | |
273 | while (1) { | |
c5797a94 | 274 | if (atomic_read(&server->inFlight) >= cifs_max_pending) { |
27a97a61 | 275 | spin_unlock(&GlobalMid_Lock); |
131afd0b | 276 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 277 | atomic_inc(&server->num_waiters); |
131afd0b | 278 | #endif |
c5797a94 JL |
279 | wait_event(server->request_q, |
280 | atomic_read(&server->inFlight) | |
27a97a61 | 281 | < cifs_max_pending); |
131afd0b | 282 | #ifdef CONFIG_CIFS_STATS2 |
c5797a94 | 283 | atomic_dec(&server->num_waiters); |
131afd0b | 284 | #endif |
27a97a61 VL |
285 | spin_lock(&GlobalMid_Lock); |
286 | } else { | |
c5797a94 | 287 | if (server->tcpStatus == CifsExiting) { |
1da177e4 | 288 | spin_unlock(&GlobalMid_Lock); |
27a97a61 | 289 | return -ENOENT; |
1da177e4 | 290 | } |
27a97a61 VL |
291 | |
292 | /* can not count locking commands against total | |
293 | as they are allowed to block on server */ | |
294 | ||
295 | /* update # of requests on the wire to server */ | |
296 | if (long_op != CIFS_BLOCKING_OP) | |
c5797a94 | 297 | atomic_inc(&server->inFlight); |
27a97a61 VL |
298 | spin_unlock(&GlobalMid_Lock); |
299 | break; | |
1da177e4 LT |
300 | } |
301 | } | |
7ee1af76 JA |
302 | return 0; |
303 | } | |
1da177e4 | 304 | |
7ee1af76 JA |
305 | static int allocate_mid(struct cifsSesInfo *ses, struct smb_hdr *in_buf, |
306 | struct mid_q_entry **ppmidQ) | |
307 | { | |
1da177e4 | 308 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 309 | return -ENOENT; |
8fbbd365 VL |
310 | } |
311 | ||
312 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
b6b38f70 | 313 | cFYI(1, "tcp session dead - return to caller to retry"); |
7ee1af76 | 314 | return -EAGAIN; |
8fbbd365 VL |
315 | } |
316 | ||
317 | if (ses->status != CifsGood) { | |
1da177e4 | 318 | /* check if SMB session is bad because we are setting it up */ |
79a58d1f | 319 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 320 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 321 | return -EAGAIN; |
ad7a2926 | 322 | /* else ok - we are setting up session */ |
1da177e4 | 323 | } |
24b9b06b | 324 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 325 | if (*ppmidQ == NULL) |
7ee1af76 | 326 | return -ENOMEM; |
ddc8cf8f JL |
327 | spin_lock(&GlobalMid_Lock); |
328 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
329 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
330 | return 0; |
331 | } | |
332 | ||
0ade640e JL |
333 | static int |
334 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 335 | { |
0ade640e | 336 | int error; |
7ee1af76 | 337 | |
0ade640e JL |
338 | error = wait_event_killable(server->response_q, |
339 | midQ->midState != MID_REQUEST_SUBMITTED); | |
340 | if (error < 0) | |
341 | return -ERESTARTSYS; | |
7ee1af76 | 342 | |
0ade640e | 343 | return 0; |
7ee1af76 JA |
344 | } |
345 | ||
133672ef | 346 | |
a6827c18 JL |
347 | /* |
348 | * Send a SMB request and set the callback function in the mid to handle | |
349 | * the result. Caller is responsible for dealing with timeouts. | |
350 | */ | |
351 | int | |
352 | cifs_call_async(struct TCP_Server_Info *server, struct smb_hdr *in_buf, | |
353 | mid_callback_t *callback, void *cbdata) | |
354 | { | |
355 | int rc; | |
356 | struct mid_q_entry *mid; | |
357 | ||
358 | rc = wait_for_free_request(server, CIFS_ASYNC_OP); | |
359 | if (rc) | |
360 | return rc; | |
361 | ||
362 | mutex_lock(&server->srv_mutex); | |
363 | mid = AllocMidQEntry(in_buf, server); | |
364 | if (mid == NULL) { | |
365 | mutex_unlock(&server->srv_mutex); | |
366 | return -ENOMEM; | |
367 | } | |
368 | ||
369 | /* put it on the pending_mid_q */ | |
370 | spin_lock(&GlobalMid_Lock); | |
371 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
372 | spin_unlock(&GlobalMid_Lock); | |
373 | ||
374 | rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); | |
375 | if (rc) { | |
376 | mutex_unlock(&server->srv_mutex); | |
377 | goto out_err; | |
378 | } | |
379 | ||
380 | mid->callback = callback; | |
381 | mid->callback_data = cbdata; | |
382 | mid->midState = MID_REQUEST_SUBMITTED; | |
383 | #ifdef CONFIG_CIFS_STATS2 | |
384 | atomic_inc(&server->inSend); | |
385 | #endif | |
386 | rc = smb_send(server, in_buf, in_buf->smb_buf_length); | |
387 | #ifdef CONFIG_CIFS_STATS2 | |
388 | atomic_dec(&server->inSend); | |
389 | mid->when_sent = jiffies; | |
390 | #endif | |
391 | mutex_unlock(&server->srv_mutex); | |
392 | if (rc) | |
393 | goto out_err; | |
394 | ||
395 | return rc; | |
396 | out_err: | |
397 | delete_mid(mid); | |
398 | atomic_dec(&server->inFlight); | |
399 | wake_up(&server->request_q); | |
400 | return rc; | |
401 | } | |
402 | ||
133672ef SF |
403 | /* |
404 | * | |
405 | * Send an SMB Request. No response info (other than return code) | |
406 | * needs to be parsed. | |
407 | * | |
408 | * flags indicate the type of request buffer and how long to wait | |
409 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
410 | * | |
411 | */ | |
412 | int | |
413 | SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses, | |
414 | struct smb_hdr *in_buf, int flags) | |
415 | { | |
416 | int rc; | |
417 | struct kvec iov[1]; | |
418 | int resp_buf_type; | |
419 | ||
420 | iov[0].iov_base = (char *)in_buf; | |
421 | iov[0].iov_len = in_buf->smb_buf_length + 4; | |
422 | flags |= CIFS_NO_RESP; | |
423 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags); | |
b6b38f70 | 424 | cFYI(DBG2, "SendRcvNoRsp flags %d rc %d", flags, rc); |
90c81e0b | 425 | |
133672ef SF |
426 | return rc; |
427 | } | |
428 | ||
053d5034 JL |
429 | static int |
430 | sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) | |
431 | { | |
432 | int rc = 0; | |
433 | ||
74dd92a8 JL |
434 | cFYI(1, "%s: cmd=%d mid=%d state=%d", __func__, mid->command, |
435 | mid->mid, mid->midState); | |
053d5034 | 436 | |
74dd92a8 | 437 | spin_lock(&GlobalMid_Lock); |
2b84a36c JL |
438 | /* ensure that it's no longer on the pending_mid_q */ |
439 | list_del_init(&mid->qhead); | |
440 | ||
74dd92a8 JL |
441 | switch (mid->midState) { |
442 | case MID_RESPONSE_RECEIVED: | |
053d5034 JL |
443 | spin_unlock(&GlobalMid_Lock); |
444 | return rc; | |
74dd92a8 JL |
445 | case MID_REQUEST_SUBMITTED: |
446 | /* socket is going down, reject all calls */ | |
447 | if (server->tcpStatus == CifsExiting) { | |
448 | cERROR(1, "%s: canceling mid=%d cmd=0x%x state=%d", | |
449 | __func__, mid->mid, mid->command, mid->midState); | |
053d5034 | 450 | rc = -EHOSTDOWN; |
74dd92a8 | 451 | break; |
053d5034 | 452 | } |
74dd92a8 JL |
453 | case MID_RETRY_NEEDED: |
454 | rc = -EAGAIN; | |
455 | break; | |
456 | default: | |
457 | cERROR(1, "%s: invalid mid state mid=%d state=%d", __func__, | |
458 | mid->mid, mid->midState); | |
459 | rc = -EIO; | |
053d5034 JL |
460 | } |
461 | spin_unlock(&GlobalMid_Lock); | |
462 | ||
2b84a36c | 463 | DeleteMidQEntry(mid); |
053d5034 JL |
464 | return rc; |
465 | } | |
466 | ||
7ee1af76 | 467 | int |
79a58d1f SF |
468 | SendReceive2(const unsigned int xid, struct cifsSesInfo *ses, |
469 | struct kvec *iov, int n_vec, int *pRespBufType /* ret */, | |
133672ef | 470 | const int flags) |
7ee1af76 JA |
471 | { |
472 | int rc = 0; | |
133672ef | 473 | int long_op; |
7ee1af76 | 474 | unsigned int receive_len; |
7ee1af76 JA |
475 | struct mid_q_entry *midQ; |
476 | struct smb_hdr *in_buf = iov[0].iov_base; | |
50c2f753 | 477 | |
133672ef SF |
478 | long_op = flags & CIFS_TIMEOUT_MASK; |
479 | ||
7ee1af76 JA |
480 | *pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */ |
481 | ||
482 | if ((ses == NULL) || (ses->server == NULL)) { | |
483 | cifs_small_buf_release(in_buf); | |
b6b38f70 | 484 | cERROR(1, "Null session"); |
7ee1af76 JA |
485 | return -EIO; |
486 | } | |
487 | ||
79a58d1f | 488 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 JA |
489 | cifs_small_buf_release(in_buf); |
490 | return -ENOENT; | |
491 | } | |
492 | ||
79a58d1f | 493 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
494 | to the same server. We may make this configurable later or |
495 | use ses->maxReq */ | |
496 | ||
c5797a94 | 497 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
498 | if (rc) { |
499 | cifs_small_buf_release(in_buf); | |
500 | return rc; | |
501 | } | |
502 | ||
79a58d1f | 503 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
504 | and avoid races inside tcp sendmsg code that could cause corruption |
505 | of smb data */ | |
506 | ||
72ca545b | 507 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
508 | |
509 | rc = allocate_mid(ses, in_buf, &midQ); | |
510 | if (rc) { | |
72ca545b | 511 | mutex_unlock(&ses->server->srv_mutex); |
4b8f930f | 512 | cifs_small_buf_release(in_buf); |
7ee1af76 | 513 | /* Update # of requests on wire to server */ |
79a58d1f | 514 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
515 | wake_up(&ses->server->request_q); |
516 | return rc; | |
1da177e4 | 517 | } |
79a58d1f | 518 | rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number); |
829049cb VL |
519 | if (rc) { |
520 | mutex_unlock(&ses->server->srv_mutex); | |
521 | cifs_small_buf_release(in_buf); | |
522 | goto out; | |
523 | } | |
1da177e4 LT |
524 | |
525 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
526 | #ifdef CONFIG_CIFS_STATS2 |
527 | atomic_inc(&ses->server->inSend); | |
528 | #endif | |
0496e02d | 529 | rc = smb_sendv(ses->server, iov, n_vec); |
131afd0b SF |
530 | #ifdef CONFIG_CIFS_STATS2 |
531 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 532 | midQ->when_sent = jiffies; |
131afd0b | 533 | #endif |
7ee1af76 | 534 | |
72ca545b | 535 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
536 | cifs_small_buf_release(in_buf); |
537 | ||
79a58d1f | 538 | if (rc < 0) |
7ee1af76 | 539 | goto out; |
4b8f930f | 540 | |
0ade640e | 541 | if (long_op == CIFS_ASYNC_OP) |
133672ef | 542 | goto out; |
d6e04ae6 | 543 | |
0ade640e JL |
544 | rc = wait_for_response(ses->server, midQ); |
545 | if (rc != 0) | |
546 | goto out; | |
d6e04ae6 | 547 | |
053d5034 JL |
548 | rc = sync_mid_result(midQ, ses->server); |
549 | if (rc != 0) { | |
79a58d1f | 550 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 551 | wake_up(&ses->server->request_q); |
d6e04ae6 SF |
552 | return rc; |
553 | } | |
50c2f753 | 554 | |
8e4f2e8a VL |
555 | receive_len = midQ->resp_buf->smb_buf_length; |
556 | ||
d6e04ae6 | 557 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
558 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
559 | receive_len, xid); | |
d6e04ae6 | 560 | rc = -EIO; |
2b2bdfba SF |
561 | goto out; |
562 | } | |
563 | ||
564 | /* rcvd frame is ok */ | |
565 | ||
566 | if (midQ->resp_buf && | |
567 | (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
568 | ||
569 | iov[0].iov_base = (char *)midQ->resp_buf; | |
570 | if (midQ->largeBuf) | |
571 | *pRespBufType = CIFS_LARGE_BUFFER; | |
572 | else | |
573 | *pRespBufType = CIFS_SMALL_BUFFER; | |
574 | iov[0].iov_len = receive_len + 4; | |
575 | ||
576 | dump_smb(midQ->resp_buf, 80); | |
577 | /* convert the length into a more usable form */ | |
578 | if ((receive_len > 24) && | |
579 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
580 | SECMODE_SIGN_ENABLED))) { | |
581 | rc = cifs_verify_signature(midQ->resp_buf, | |
21e73393 | 582 | ses->server, |
d6e04ae6 | 583 | midQ->sequence_number+1); |
2b2bdfba | 584 | if (rc) { |
b6b38f70 | 585 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 586 | /* BB FIXME add code to kill session */ |
d6e04ae6 | 587 | } |
d6e04ae6 | 588 | } |
2b2bdfba SF |
589 | |
590 | /* BB special case reconnect tid and uid here? */ | |
591 | rc = map_smb_to_linux_error(midQ->resp_buf, | |
592 | flags & CIFS_LOG_ERROR); | |
593 | ||
594 | /* convert ByteCount if necessary */ | |
595 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
596 | /* do not count RFC1001 header */ + | |
597 | (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ ) | |
598 | BCC(midQ->resp_buf) = | |
599 | le16_to_cpu(BCC_LE(midQ->resp_buf)); | |
600 | if ((flags & CIFS_NO_RESP) == 0) | |
601 | midQ->resp_buf = NULL; /* mark it so buf will | |
602 | not be freed by | |
ddc8cf8f | 603 | delete_mid */ |
2b2bdfba SF |
604 | } else { |
605 | rc = -EIO; | |
b6b38f70 | 606 | cFYI(1, "Bad MID state?"); |
d6e04ae6 | 607 | } |
1da177e4 | 608 | |
7ee1af76 | 609 | out: |
ddc8cf8f | 610 | delete_mid(midQ); |
79a58d1f | 611 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 612 | wake_up(&ses->server->request_q); |
1da177e4 | 613 | |
d6e04ae6 SF |
614 | return rc; |
615 | } | |
1da177e4 LT |
616 | |
617 | int | |
618 | SendReceive(const unsigned int xid, struct cifsSesInfo *ses, | |
619 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
620 | int *pbytes_returned, const int long_op) | |
621 | { | |
622 | int rc = 0; | |
623 | unsigned int receive_len; | |
1da177e4 LT |
624 | struct mid_q_entry *midQ; |
625 | ||
626 | if (ses == NULL) { | |
b6b38f70 | 627 | cERROR(1, "Null smb session"); |
1da177e4 LT |
628 | return -EIO; |
629 | } | |
79a58d1f | 630 | if (ses->server == NULL) { |
b6b38f70 | 631 | cERROR(1, "Null tcp session"); |
1da177e4 LT |
632 | return -EIO; |
633 | } | |
634 | ||
79a58d1f | 635 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
636 | return -ENOENT; |
637 | ||
79a58d1f | 638 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
639 | to the same server. We may make this configurable later or |
640 | use ses->maxReq */ | |
1da177e4 | 641 | |
6d9c6d54 | 642 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
643 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
644 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
645 | return -EIO; |
646 | } | |
647 | ||
c5797a94 | 648 | rc = wait_for_free_request(ses->server, long_op); |
7ee1af76 JA |
649 | if (rc) |
650 | return rc; | |
651 | ||
79a58d1f | 652 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
653 | and avoid races inside tcp sendmsg code that could cause corruption |
654 | of smb data */ | |
655 | ||
72ca545b | 656 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 657 | |
7ee1af76 JA |
658 | rc = allocate_mid(ses, in_buf, &midQ); |
659 | if (rc) { | |
72ca545b | 660 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 661 | /* Update # of requests on wire to server */ |
79a58d1f | 662 | atomic_dec(&ses->server->inFlight); |
7ee1af76 JA |
663 | wake_up(&ses->server->request_q); |
664 | return rc; | |
1da177e4 LT |
665 | } |
666 | ||
ad009ac9 | 667 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
668 | if (rc) { |
669 | mutex_unlock(&ses->server->srv_mutex); | |
670 | goto out; | |
671 | } | |
1da177e4 LT |
672 | |
673 | midQ->midState = MID_REQUEST_SUBMITTED; | |
131afd0b SF |
674 | #ifdef CONFIG_CIFS_STATS2 |
675 | atomic_inc(&ses->server->inSend); | |
676 | #endif | |
0496e02d | 677 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
131afd0b SF |
678 | #ifdef CONFIG_CIFS_STATS2 |
679 | atomic_dec(&ses->server->inSend); | |
1047abc1 | 680 | midQ->when_sent = jiffies; |
131afd0b | 681 | #endif |
72ca545b | 682 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 683 | |
79a58d1f | 684 | if (rc < 0) |
7ee1af76 JA |
685 | goto out; |
686 | ||
0ade640e | 687 | if (long_op == CIFS_ASYNC_OP) |
7ee1af76 | 688 | goto out; |
1da177e4 | 689 | |
0ade640e JL |
690 | rc = wait_for_response(ses->server, midQ); |
691 | if (rc != 0) | |
692 | goto out; | |
1da177e4 | 693 | |
053d5034 JL |
694 | rc = sync_mid_result(midQ, ses->server); |
695 | if (rc != 0) { | |
79a58d1f | 696 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 697 | wake_up(&ses->server->request_q); |
1da177e4 LT |
698 | return rc; |
699 | } | |
50c2f753 | 700 | |
8e4f2e8a VL |
701 | receive_len = midQ->resp_buf->smb_buf_length; |
702 | ||
1da177e4 | 703 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
704 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
705 | receive_len, xid); | |
1da177e4 | 706 | rc = -EIO; |
2b2bdfba SF |
707 | goto out; |
708 | } | |
709 | ||
710 | /* rcvd frame is ok */ | |
711 | ||
712 | if (midQ->resp_buf && out_buf | |
713 | && (midQ->midState == MID_RESPONSE_RECEIVED)) { | |
714 | out_buf->smb_buf_length = receive_len; | |
715 | memcpy((char *)out_buf + 4, | |
716 | (char *)midQ->resp_buf + 4, | |
717 | receive_len); | |
718 | ||
719 | dump_smb(out_buf, 92); | |
720 | /* convert the length into a more usable form */ | |
721 | if ((receive_len > 24) && | |
722 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
723 | SECMODE_SIGN_ENABLED))) { | |
724 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 725 | ses->server, |
ad009ac9 | 726 | midQ->sequence_number+1); |
2b2bdfba | 727 | if (rc) { |
b6b38f70 | 728 | cERROR(1, "Unexpected SMB signature"); |
2b2bdfba | 729 | /* BB FIXME add code to kill session */ |
1da177e4 | 730 | } |
2b2bdfba | 731 | } |
1da177e4 | 732 | |
2b2bdfba | 733 | *pbytes_returned = out_buf->smb_buf_length; |
1da177e4 | 734 | |
2b2bdfba SF |
735 | /* BB special case reconnect tid and uid here? */ |
736 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
1da177e4 | 737 | |
2b2bdfba SF |
738 | /* convert ByteCount if necessary */ |
739 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
740 | /* do not count RFC1001 header */ + | |
741 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
742 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
743 | } else { | |
744 | rc = -EIO; | |
b6b38f70 | 745 | cERROR(1, "Bad MID state?"); |
1da177e4 | 746 | } |
7ee1af76 JA |
747 | |
748 | out: | |
ddc8cf8f | 749 | delete_mid(midQ); |
79a58d1f | 750 | atomic_dec(&ses->server->inFlight); |
7ee1af76 | 751 | wake_up(&ses->server->request_q); |
1da177e4 | 752 | |
7ee1af76 JA |
753 | return rc; |
754 | } | |
1da177e4 | 755 | |
7ee1af76 JA |
756 | /* Send an NT_CANCEL SMB to cause the POSIX blocking lock to return. */ |
757 | ||
758 | static int | |
759 | send_nt_cancel(struct cifsTconInfo *tcon, struct smb_hdr *in_buf, | |
760 | struct mid_q_entry *midQ) | |
761 | { | |
762 | int rc = 0; | |
763 | struct cifsSesInfo *ses = tcon->ses; | |
764 | __u16 mid = in_buf->Mid; | |
765 | ||
766 | header_assemble(in_buf, SMB_COM_NT_CANCEL, tcon, 0); | |
767 | in_buf->Mid = mid; | |
72ca545b | 768 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
769 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
770 | if (rc) { | |
72ca545b | 771 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
772 | return rc; |
773 | } | |
0496e02d | 774 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
72ca545b | 775 | mutex_unlock(&ses->server->srv_mutex); |
1da177e4 | 776 | return rc; |
7ee1af76 JA |
777 | } |
778 | ||
779 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows | |
780 | blocking lock to return. */ | |
781 | ||
782 | static int | |
783 | send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon, | |
784 | struct smb_hdr *in_buf, | |
785 | struct smb_hdr *out_buf) | |
786 | { | |
787 | int bytes_returned; | |
788 | struct cifsSesInfo *ses = tcon->ses; | |
789 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; | |
790 | ||
791 | /* We just modify the current in_buf to change | |
792 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
793 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
794 | LOCKING_ANDX_CANCEL_LOCK. */ | |
795 | ||
796 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
797 | pSMB->Timeout = 0; | |
798 | pSMB->hdr.Mid = GetNextMid(ses->server); | |
799 | ||
800 | return SendReceive(xid, ses, in_buf, out_buf, | |
133672ef | 801 | &bytes_returned, CIFS_STD_OP); |
7ee1af76 JA |
802 | } |
803 | ||
804 | int | |
805 | SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon, | |
806 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, | |
807 | int *pbytes_returned) | |
808 | { | |
809 | int rc = 0; | |
810 | int rstart = 0; | |
811 | unsigned int receive_len; | |
812 | struct mid_q_entry *midQ; | |
813 | struct cifsSesInfo *ses; | |
814 | ||
815 | if (tcon == NULL || tcon->ses == NULL) { | |
b6b38f70 | 816 | cERROR(1, "Null smb session"); |
7ee1af76 JA |
817 | return -EIO; |
818 | } | |
819 | ses = tcon->ses; | |
820 | ||
79a58d1f | 821 | if (ses->server == NULL) { |
b6b38f70 | 822 | cERROR(1, "Null tcp session"); |
7ee1af76 JA |
823 | return -EIO; |
824 | } | |
825 | ||
79a58d1f | 826 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
827 | return -ENOENT; |
828 | ||
79a58d1f | 829 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
830 | to the same server. We may make this configurable later or |
831 | use ses->maxReq */ | |
832 | ||
6d9c6d54 | 833 | if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
b6b38f70 JP |
834 | cERROR(1, "Illegal length, greater than maximum frame, %d", |
835 | in_buf->smb_buf_length); | |
6d9c6d54 VL |
836 | return -EIO; |
837 | } | |
838 | ||
c5797a94 | 839 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP); |
7ee1af76 JA |
840 | if (rc) |
841 | return rc; | |
842 | ||
79a58d1f | 843 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
844 | and avoid races inside tcp sendmsg code that could cause corruption |
845 | of smb data */ | |
846 | ||
72ca545b | 847 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
848 | |
849 | rc = allocate_mid(ses, in_buf, &midQ); | |
850 | if (rc) { | |
72ca545b | 851 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
852 | return rc; |
853 | } | |
854 | ||
7ee1af76 | 855 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 856 | if (rc) { |
ddc8cf8f | 857 | delete_mid(midQ); |
829049cb VL |
858 | mutex_unlock(&ses->server->srv_mutex); |
859 | return rc; | |
860 | } | |
1da177e4 | 861 | |
7ee1af76 JA |
862 | midQ->midState = MID_REQUEST_SUBMITTED; |
863 | #ifdef CONFIG_CIFS_STATS2 | |
864 | atomic_inc(&ses->server->inSend); | |
865 | #endif | |
0496e02d | 866 | rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length); |
7ee1af76 JA |
867 | #ifdef CONFIG_CIFS_STATS2 |
868 | atomic_dec(&ses->server->inSend); | |
869 | midQ->when_sent = jiffies; | |
870 | #endif | |
72ca545b | 871 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 872 | |
79a58d1f | 873 | if (rc < 0) { |
ddc8cf8f | 874 | delete_mid(midQ); |
7ee1af76 JA |
875 | return rc; |
876 | } | |
877 | ||
878 | /* Wait for a reply - allow signals to interrupt. */ | |
879 | rc = wait_event_interruptible(ses->server->response_q, | |
79a58d1f | 880 | (!(midQ->midState == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
881 | ((ses->server->tcpStatus != CifsGood) && |
882 | (ses->server->tcpStatus != CifsNew))); | |
883 | ||
884 | /* Were we interrupted by a signal ? */ | |
885 | if ((rc == -ERESTARTSYS) && | |
886 | (midQ->midState == MID_REQUEST_SUBMITTED) && | |
887 | ((ses->server->tcpStatus == CifsGood) || | |
888 | (ses->server->tcpStatus == CifsNew))) { | |
889 | ||
890 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
891 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
892 | blocking lock to return. */ | |
893 | ||
894 | rc = send_nt_cancel(tcon, in_buf, midQ); | |
895 | if (rc) { | |
ddc8cf8f | 896 | delete_mid(midQ); |
7ee1af76 JA |
897 | return rc; |
898 | } | |
899 | } else { | |
900 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
901 | to cause the blocking lock to return. */ | |
902 | ||
903 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
904 | ||
905 | /* If we get -ENOLCK back the lock may have | |
906 | already been removed. Don't exit in this case. */ | |
907 | if (rc && rc != -ENOLCK) { | |
ddc8cf8f | 908 | delete_mid(midQ); |
7ee1af76 JA |
909 | return rc; |
910 | } | |
911 | } | |
912 | ||
0ade640e | 913 | if (wait_for_response(ses->server, midQ) == 0) { |
7ee1af76 JA |
914 | /* We got the response - restart system call. */ |
915 | rstart = 1; | |
916 | } | |
917 | } | |
918 | ||
053d5034 JL |
919 | rc = sync_mid_result(midQ, ses->server); |
920 | if (rc != 0) | |
7ee1af76 | 921 | return rc; |
50c2f753 | 922 | |
053d5034 | 923 | receive_len = midQ->resp_buf->smb_buf_length; |
7ee1af76 | 924 | if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) { |
b6b38f70 JP |
925 | cERROR(1, "Frame too large received. Length: %d Xid: %d", |
926 | receive_len, xid); | |
7ee1af76 | 927 | rc = -EIO; |
17c8bfed VL |
928 | goto out; |
929 | } | |
7ee1af76 | 930 | |
17c8bfed | 931 | /* rcvd frame is ok */ |
7ee1af76 | 932 | |
ac6a3ef4 | 933 | if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) { |
698e96a8 | 934 | rc = -EIO; |
b6b38f70 | 935 | cERROR(1, "Bad MID state?"); |
698e96a8 VL |
936 | goto out; |
937 | } | |
1da177e4 | 938 | |
698e96a8 VL |
939 | out_buf->smb_buf_length = receive_len; |
940 | memcpy((char *)out_buf + 4, | |
941 | (char *)midQ->resp_buf + 4, | |
942 | receive_len); | |
943 | ||
944 | dump_smb(out_buf, 92); | |
945 | /* convert the length into a more usable form */ | |
946 | if ((receive_len > 24) && | |
947 | (ses->server->secMode & (SECMODE_SIGN_REQUIRED | | |
948 | SECMODE_SIGN_ENABLED))) { | |
949 | rc = cifs_verify_signature(out_buf, | |
21e73393 | 950 | ses->server, |
698e96a8 VL |
951 | midQ->sequence_number+1); |
952 | if (rc) { | |
b6b38f70 | 953 | cERROR(1, "Unexpected SMB signature"); |
698e96a8 | 954 | /* BB FIXME add code to kill session */ |
7ee1af76 | 955 | } |
698e96a8 | 956 | } |
17c8bfed | 957 | |
698e96a8 | 958 | *pbytes_returned = out_buf->smb_buf_length; |
17c8bfed | 959 | |
698e96a8 VL |
960 | /* BB special case reconnect tid and uid here? */ |
961 | rc = map_smb_to_linux_error(out_buf, 0 /* no log */ ); | |
17c8bfed | 962 | |
698e96a8 VL |
963 | /* convert ByteCount if necessary */ |
964 | if (receive_len >= sizeof(struct smb_hdr) - 4 | |
965 | /* do not count RFC1001 header */ + | |
966 | (2 * out_buf->WordCount) + 2 /* bcc */ ) | |
967 | BCC(out_buf) = le16_to_cpu(BCC_LE(out_buf)); | |
17c8bfed VL |
968 | |
969 | out: | |
ddc8cf8f | 970 | delete_mid(midQ); |
7ee1af76 JA |
971 | if (rstart && rc == -EACCES) |
972 | return -ERESTARTSYS; | |
1da177e4 LT |
973 | return rc; |
974 | } |