Commit | Line | Data |
---|---|---|
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> | |
f06ac72e | 29 | #include <linux/freezer.h> |
b8eed283 | 30 | #include <linux/tcp.h> |
2f8b5444 | 31 | #include <linux/bvec.h> |
97bc00b3 | 32 | #include <linux/highmem.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/processor.h> |
35 | #include <linux/mempool.h> | |
36 | #include "cifspdu.h" | |
37 | #include "cifsglob.h" | |
38 | #include "cifsproto.h" | |
39 | #include "cifs_debug.h" | |
8bd68c6e | 40 | #include "smb2proto.h" |
9762c2d0 | 41 | #include "smbdirect.h" |
50c2f753 | 42 | |
3cecf486 RS |
43 | /* Max number of iovectors we can use off the stack when sending requests. */ |
44 | #define CIFS_MAX_IOV_SIZE 8 | |
45 | ||
2dc7e1c0 PS |
46 | void |
47 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
48 | { |
49 | wake_up_process(mid->callback_data); | |
50 | } | |
51 | ||
a6827c18 | 52 | struct mid_q_entry * |
24b9b06b | 53 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
54 | { |
55 | struct mid_q_entry *temp; | |
56 | ||
24b9b06b | 57 | if (server == NULL) { |
f96637be | 58 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
1da177e4 LT |
59 | return NULL; |
60 | } | |
50c2f753 | 61 | |
232087cb | 62 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
a6f74e80 | 63 | memset(temp, 0, sizeof(struct mid_q_entry)); |
696e420b | 64 | kref_init(&temp->refcount); |
a6f74e80 N |
65 | temp->mid = get_mid(smb_buffer); |
66 | temp->pid = current->pid; | |
67 | temp->command = cpu_to_le16(smb_buffer->Command); | |
68 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 69 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
70 | /* when mid allocated can be before when sent */ |
71 | temp->when_alloc = jiffies; | |
72 | temp->server = server; | |
2b84a36c | 73 | |
a6f74e80 N |
74 | /* |
75 | * The default is for the mid to be synchronous, so the | |
76 | * default callback just wakes up the current task. | |
77 | */ | |
78 | temp->callback = cifs_wake_up_task; | |
79 | temp->callback_data = current; | |
1da177e4 | 80 | |
1da177e4 | 81 | atomic_inc(&midCount); |
7c9421e1 | 82 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
83 | return temp; |
84 | } | |
85 | ||
696e420b LP |
86 | static void _cifs_mid_q_entry_release(struct kref *refcount) |
87 | { | |
88 | struct mid_q_entry *mid = container_of(refcount, struct mid_q_entry, | |
89 | refcount); | |
90 | ||
91 | mempool_free(mid, cifs_mid_poolp); | |
92 | } | |
93 | ||
94 | void cifs_mid_q_entry_release(struct mid_q_entry *midEntry) | |
95 | { | |
96 | spin_lock(&GlobalMid_Lock); | |
97 | kref_put(&midEntry->refcount, _cifs_mid_q_entry_release); | |
98 | spin_unlock(&GlobalMid_Lock); | |
99 | } | |
100 | ||
766fdbb5 | 101 | void |
1da177e4 LT |
102 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
103 | { | |
1047abc1 | 104 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 105 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
106 | unsigned long now; |
107 | #endif | |
7c9421e1 | 108 | midEntry->mid_state = MID_FREE; |
8097531a | 109 | atomic_dec(&midCount); |
7c9421e1 | 110 | if (midEntry->large_buf) |
b8643e1b SF |
111 | cifs_buf_release(midEntry->resp_buf); |
112 | else | |
113 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
114 | #ifdef CONFIG_CIFS_STATS2 |
115 | now = jiffies; | |
116 | /* commands taking longer than one second are indications that | |
117 | something is wrong, unless it is quite a slow link or server */ | |
4328fea7 | 118 | if (time_after(now, midEntry->when_alloc + HZ)) { |
2dc7e1c0 | 119 | if ((cifsFYI & CIFS_TIMER) && (midEntry->command != command)) { |
0b456f04 | 120 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 121 | midEntry->command, midEntry->mid); |
0b456f04 | 122 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
123 | now - midEntry->when_alloc, |
124 | now - midEntry->when_sent, | |
125 | now - midEntry->when_received); | |
126 | } | |
127 | } | |
128 | #endif | |
696e420b | 129 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
130 | } |
131 | ||
3c1bf7e4 PS |
132 | void |
133 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
134 | { |
135 | spin_lock(&GlobalMid_Lock); | |
136 | list_del(&mid->qhead); | |
137 | spin_unlock(&GlobalMid_Lock); | |
138 | ||
139 | DeleteMidQEntry(mid); | |
140 | } | |
141 | ||
6f49f46b JL |
142 | /* |
143 | * smb_send_kvec - send an array of kvecs to the server | |
144 | * @server: Server to send the data to | |
3ab3f2a1 | 145 | * @smb_msg: Message to send |
6f49f46b JL |
146 | * @sent: amount of data sent on socket is stored here |
147 | * | |
148 | * Our basic "send data to server" function. Should be called with srv_mutex | |
149 | * held. The caller is responsible for handling the results. | |
150 | */ | |
d6e04ae6 | 151 | static int |
3ab3f2a1 AV |
152 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
153 | size_t *sent) | |
1da177e4 LT |
154 | { |
155 | int rc = 0; | |
3ab3f2a1 | 156 | int retries = 0; |
edf1ae40 | 157 | struct socket *ssocket = server->ssocket; |
50c2f753 | 158 | |
6f49f46b JL |
159 | *sent = 0; |
160 | ||
3ab3f2a1 AV |
161 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
162 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
163 | smb_msg->msg_control = NULL; | |
164 | smb_msg->msg_controllen = 0; | |
0496e02d | 165 | if (server->noblocksnd) |
3ab3f2a1 | 166 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 167 | else |
3ab3f2a1 | 168 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 169 | |
3ab3f2a1 | 170 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
171 | /* |
172 | * If blocking send, we try 3 times, since each can block | |
173 | * for 5 seconds. For nonblocking we have to try more | |
174 | * but wait increasing amounts of time allowing time for | |
175 | * socket to clear. The overall time we wait in either | |
176 | * case to send on the socket is about 15 seconds. | |
177 | * Similarly we wait for 15 seconds for a response from | |
178 | * the server in SendReceive[2] for the server to send | |
179 | * a response back for most types of requests (except | |
180 | * SMB Write past end of file which can be slow, and | |
181 | * blocking lock operations). NFS waits slightly longer | |
182 | * than CIFS, but this can make it take longer for | |
183 | * nonresponsive servers to be detected and 15 seconds | |
184 | * is more than enough time for modern networks to | |
185 | * send a packet. In most cases if we fail to send | |
186 | * after the retries we will kill the socket and | |
187 | * reconnect which may clear the network problem. | |
188 | */ | |
3ab3f2a1 | 189 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 190 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
191 | retries++; |
192 | if (retries >= 14 || | |
193 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
194 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
195 | ssocket); | |
3ab3f2a1 | 196 | return -EAGAIN; |
1da177e4 | 197 | } |
3ab3f2a1 | 198 | msleep(1 << retries); |
1da177e4 LT |
199 | continue; |
200 | } | |
6f49f46b | 201 | |
79a58d1f | 202 | if (rc < 0) |
3ab3f2a1 | 203 | return rc; |
6f49f46b | 204 | |
79a58d1f | 205 | if (rc == 0) { |
3e84469d SF |
206 | /* should never happen, letting socket clear before |
207 | retrying is our only obvious option here */ | |
f96637be | 208 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
209 | msleep(500); |
210 | continue; | |
d6e04ae6 | 211 | } |
6f49f46b | 212 | |
3ab3f2a1 AV |
213 | /* send was at least partially successful */ |
214 | *sent += rc; | |
215 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 216 | } |
3ab3f2a1 | 217 | return 0; |
97bc00b3 JL |
218 | } |
219 | ||
35e2cc1b | 220 | unsigned long |
81f39f95 | 221 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
222 | { |
223 | unsigned int i; | |
35e2cc1b PA |
224 | struct kvec *iov; |
225 | int nvec; | |
a26054d1 JL |
226 | unsigned long buflen = 0; |
227 | ||
81f39f95 RS |
228 | if (server->vals->header_preamble_size == 0 && |
229 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
230 | iov = &rqst->rq_iov[1]; |
231 | nvec = rqst->rq_nvec - 1; | |
232 | } else { | |
233 | iov = rqst->rq_iov; | |
234 | nvec = rqst->rq_nvec; | |
235 | } | |
236 | ||
a26054d1 | 237 | /* total up iov array first */ |
35e2cc1b | 238 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
239 | buflen += iov[i].iov_len; |
240 | ||
c06a0f2d LL |
241 | /* |
242 | * Add in the page array if there is one. The caller needs to make | |
243 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
244 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
245 | * PAGE_SIZE. | |
246 | */ | |
a26054d1 | 247 | if (rqst->rq_npages) { |
c06a0f2d LL |
248 | if (rqst->rq_npages == 1) |
249 | buflen += rqst->rq_tailsz; | |
250 | else { | |
251 | /* | |
252 | * If there is more than one page, calculate the | |
253 | * buffer length based on rq_offset and rq_tailsz | |
254 | */ | |
255 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
256 | rqst->rq_offset; | |
257 | buflen += rqst->rq_tailsz; | |
258 | } | |
a26054d1 JL |
259 | } |
260 | ||
261 | return buflen; | |
262 | } | |
263 | ||
6f49f46b | 264 | static int |
07cd952f RS |
265 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
266 | struct smb_rqst *rqst) | |
6f49f46b | 267 | { |
07cd952f RS |
268 | int rc = 0; |
269 | struct kvec *iov; | |
270 | int n_vec; | |
271 | unsigned int send_length = 0; | |
272 | unsigned int i, j; | |
3ab3f2a1 | 273 | size_t total_len = 0, sent, size; |
b8eed283 | 274 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 275 | struct msghdr smb_msg; |
b8eed283 | 276 | int val = 1; |
c713c877 RS |
277 | __be32 rfc1002_marker; |
278 | ||
9762c2d0 | 279 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
81f39f95 | 280 | rc = smbd_send(server, rqst); |
9762c2d0 LL |
281 | goto smbd_done; |
282 | } | |
ea702b80 JL |
283 | if (ssocket == NULL) |
284 | return -ENOTSOCK; | |
285 | ||
b8eed283 JL |
286 | /* cork the socket */ |
287 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
288 | (char *)&val, sizeof(val)); | |
289 | ||
07cd952f | 290 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 291 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
292 | rfc1002_marker = cpu_to_be32(send_length); |
293 | ||
c713c877 RS |
294 | /* Generate a rfc1002 marker for SMB2+ */ |
295 | if (server->vals->header_preamble_size == 0) { | |
296 | struct kvec hiov = { | |
297 | .iov_base = &rfc1002_marker, | |
298 | .iov_len = 4 | |
299 | }; | |
300 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov, | |
301 | 1, 4); | |
302 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
303 | if (rc < 0) | |
304 | goto uncork; | |
305 | ||
306 | total_len += sent; | |
307 | send_length += 4; | |
308 | } | |
309 | ||
662bf5bc PA |
310 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
311 | ||
07cd952f RS |
312 | for (j = 0; j < num_rqst; j++) { |
313 | iov = rqst[j].rq_iov; | |
314 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 315 | |
07cd952f | 316 | size = 0; |
662bf5bc PA |
317 | for (i = 0; i < n_vec; i++) { |
318 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 319 | size += iov[i].iov_len; |
662bf5bc | 320 | } |
97bc00b3 | 321 | |
07cd952f RS |
322 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, |
323 | iov, n_vec, size); | |
97bc00b3 | 324 | |
3ab3f2a1 | 325 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 326 | if (rc < 0) |
07cd952f | 327 | goto uncork; |
97bc00b3 JL |
328 | |
329 | total_len += sent; | |
07cd952f RS |
330 | |
331 | /* now walk the page array and send each page in it */ | |
332 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
333 | struct bio_vec bvec; | |
334 | ||
335 | bvec.bv_page = rqst[j].rq_pages[i]; | |
336 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
337 | &bvec.bv_offset); | |
338 | ||
339 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, | |
340 | &bvec, 1, bvec.bv_len); | |
341 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
342 | if (rc < 0) | |
343 | break; | |
344 | ||
345 | total_len += sent; | |
346 | } | |
97bc00b3 | 347 | } |
1da177e4 | 348 | |
97bc00b3 | 349 | uncork: |
b8eed283 JL |
350 | /* uncork it */ |
351 | val = 0; | |
352 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
353 | (char *)&val, sizeof(val)); | |
354 | ||
c713c877 | 355 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 356 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 357 | send_length, total_len); |
6f49f46b JL |
358 | /* |
359 | * If we have only sent part of an SMB then the next SMB could | |
360 | * be taken as the remainder of this one. We need to kill the | |
361 | * socket so the server throws away the partial SMB | |
362 | */ | |
edf1ae40 | 363 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
364 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
365 | server->hostname); | |
edf1ae40 | 366 | } |
9762c2d0 | 367 | smbd_done: |
d804d41d | 368 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
369 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
370 | rc); | |
d804d41d | 371 | else |
1da177e4 | 372 | rc = 0; |
1da177e4 LT |
373 | |
374 | return rc; | |
375 | } | |
376 | ||
1f3a8f5f | 377 | #define MAX_COMPOUND 5 |
b2c96de7 | 378 | |
6f49f46b | 379 | static int |
1f3a8f5f RS |
380 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
381 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 382 | { |
b2c96de7 RS |
383 | struct kvec iov; |
384 | struct smb2_transform_hdr tr_hdr; | |
385 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
386 | int rc; |
387 | ||
388 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
389 | return __smb_send_rqst(server, num_rqst, rqst); |
390 | ||
391 | if (num_rqst > MAX_COMPOUND - 1) | |
392 | return -ENOMEM; | |
7fb8986e | 393 | |
b2c96de7 RS |
394 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
395 | memset(&iov, 0, sizeof(iov)); | |
396 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
397 | ||
398 | iov.iov_base = &tr_hdr; | |
399 | iov.iov_len = sizeof(tr_hdr); | |
400 | cur_rqst[0].rq_iov = &iov; | |
401 | cur_rqst[0].rq_nvec = 1; | |
402 | ||
403 | if (!server->ops->init_transform_rq) { | |
404 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
405 | "is missing\n"); | |
7fb8986e PS |
406 | return -EIO; |
407 | } | |
6f49f46b | 408 | |
1f3a8f5f RS |
409 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
410 | &cur_rqst[0], rqst); | |
7fb8986e PS |
411 | if (rc) |
412 | return rc; | |
413 | ||
1f3a8f5f RS |
414 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
415 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 416 | return rc; |
6f49f46b JL |
417 | } |
418 | ||
0496e02d JL |
419 | int |
420 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
421 | unsigned int smb_buf_length) | |
422 | { | |
738f9de5 | 423 | struct kvec iov[2]; |
7fb8986e PS |
424 | struct smb_rqst rqst = { .rq_iov = iov, |
425 | .rq_nvec = 2 }; | |
0496e02d | 426 | |
738f9de5 PS |
427 | iov[0].iov_base = smb_buffer; |
428 | iov[0].iov_len = 4; | |
429 | iov[1].iov_base = (char *)smb_buffer + 4; | |
430 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 431 | |
07cd952f | 432 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
433 | } |
434 | ||
fc40f9cf | 435 | static int |
a891f0f8 | 436 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 437 | int *credits) |
1da177e4 | 438 | { |
5bc59498 PS |
439 | int rc; |
440 | ||
fc40f9cf | 441 | spin_lock(&server->req_lock); |
a891f0f8 | 442 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 443 | /* oplock breaks must not be held up */ |
fc40f9cf | 444 | server->in_flight++; |
bc205ed1 | 445 | *credits -= 1; |
fc40f9cf | 446 | spin_unlock(&server->req_lock); |
27a97a61 VL |
447 | return 0; |
448 | } | |
449 | ||
27a97a61 | 450 | while (1) { |
bc205ed1 | 451 | if (*credits <= 0) { |
fc40f9cf | 452 | spin_unlock(&server->req_lock); |
789e6661 | 453 | cifs_num_waiters_inc(server); |
5bc59498 | 454 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 455 | has_credits(server, credits)); |
789e6661 | 456 | cifs_num_waiters_dec(server); |
5bc59498 PS |
457 | if (rc) |
458 | return rc; | |
fc40f9cf | 459 | spin_lock(&server->req_lock); |
27a97a61 | 460 | } else { |
c5797a94 | 461 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 462 | spin_unlock(&server->req_lock); |
27a97a61 | 463 | return -ENOENT; |
1da177e4 | 464 | } |
27a97a61 | 465 | |
2d86dbc9 PS |
466 | /* |
467 | * Can not count locking commands against total | |
468 | * as they are allowed to block on server. | |
469 | */ | |
27a97a61 VL |
470 | |
471 | /* update # of requests on the wire to server */ | |
a891f0f8 | 472 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 473 | *credits -= 1; |
fc40f9cf | 474 | server->in_flight++; |
2d86dbc9 | 475 | } |
fc40f9cf | 476 | spin_unlock(&server->req_lock); |
27a97a61 | 477 | break; |
1da177e4 LT |
478 | } |
479 | } | |
7ee1af76 JA |
480 | return 0; |
481 | } | |
1da177e4 | 482 | |
bc205ed1 | 483 | static int |
a891f0f8 PS |
484 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
485 | const int optype) | |
bc205ed1 | 486 | { |
eb4c7df6 SP |
487 | int *val; |
488 | ||
489 | val = server->ops->get_credits_field(server, optype); | |
490 | /* Since an echo is already inflight, no need to wait to send another */ | |
491 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
492 | return -EAGAIN; | |
493 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
494 | } |
495 | ||
cb7e9eab PS |
496 | int |
497 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
498 | unsigned int *num, unsigned int *credits) | |
499 | { | |
500 | *num = size; | |
501 | *credits = 0; | |
502 | return 0; | |
503 | } | |
504 | ||
96daf2b0 | 505 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
506 | struct mid_q_entry **ppmidQ) |
507 | { | |
1da177e4 | 508 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 509 | return -ENOENT; |
8fbbd365 VL |
510 | } |
511 | ||
512 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 513 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 514 | return -EAGAIN; |
8fbbd365 VL |
515 | } |
516 | ||
7f48558e | 517 | if (ses->status == CifsNew) { |
79a58d1f | 518 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 519 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 520 | return -EAGAIN; |
ad7a2926 | 521 | /* else ok - we are setting up session */ |
1da177e4 | 522 | } |
7f48558e SP |
523 | |
524 | if (ses->status == CifsExiting) { | |
525 | /* check if SMB session is bad because we are setting it up */ | |
526 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
527 | return -EAGAIN; | |
528 | /* else ok - we are shutting down session */ | |
529 | } | |
530 | ||
24b9b06b | 531 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 532 | if (*ppmidQ == NULL) |
7ee1af76 | 533 | return -ENOMEM; |
ddc8cf8f JL |
534 | spin_lock(&GlobalMid_Lock); |
535 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
536 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
537 | return 0; |
538 | } | |
539 | ||
0ade640e JL |
540 | static int |
541 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 542 | { |
0ade640e | 543 | int error; |
7ee1af76 | 544 | |
5853cc2a | 545 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 546 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
547 | if (error < 0) |
548 | return -ERESTARTSYS; | |
7ee1af76 | 549 | |
0ade640e | 550 | return 0; |
7ee1af76 JA |
551 | } |
552 | ||
fec344e3 JL |
553 | struct mid_q_entry * |
554 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
555 | { |
556 | int rc; | |
fec344e3 | 557 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
558 | struct mid_q_entry *mid; |
559 | ||
738f9de5 PS |
560 | if (rqst->rq_iov[0].iov_len != 4 || |
561 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
562 | return ERR_PTR(-EIO); | |
563 | ||
792af7b0 | 564 | /* enable signing if server requires it */ |
38d77c50 | 565 | if (server->sign) |
792af7b0 PS |
566 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
567 | ||
568 | mid = AllocMidQEntry(hdr, server); | |
569 | if (mid == NULL) | |
fec344e3 | 570 | return ERR_PTR(-ENOMEM); |
792af7b0 | 571 | |
fec344e3 | 572 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
573 | if (rc) { |
574 | DeleteMidQEntry(mid); | |
fec344e3 | 575 | return ERR_PTR(rc); |
ffc61ccb SP |
576 | } |
577 | ||
fec344e3 | 578 | return mid; |
792af7b0 | 579 | } |
133672ef | 580 | |
a6827c18 JL |
581 | /* |
582 | * Send a SMB request and set the callback function in the mid to handle | |
583 | * the result. Caller is responsible for dealing with timeouts. | |
584 | */ | |
585 | int | |
fec344e3 | 586 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
587 | mid_receive_t *receive, mid_callback_t *callback, |
588 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 589 | { |
a891f0f8 | 590 | int rc, timeout, optype; |
a6827c18 | 591 | struct mid_q_entry *mid; |
cb7e9eab | 592 | unsigned int credits = 0; |
a6827c18 | 593 | |
a891f0f8 PS |
594 | timeout = flags & CIFS_TIMEOUT_MASK; |
595 | optype = flags & CIFS_OP_MASK; | |
596 | ||
cb7e9eab PS |
597 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
598 | rc = wait_for_free_request(server, timeout, optype); | |
599 | if (rc) | |
600 | return rc; | |
601 | credits = 1; | |
602 | } | |
a6827c18 JL |
603 | |
604 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
605 | mid = server->ops->setup_async_request(server, rqst); |
606 | if (IS_ERR(mid)) { | |
a6827c18 | 607 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 608 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 609 | return PTR_ERR(mid); |
a6827c18 JL |
610 | } |
611 | ||
44d22d84 | 612 | mid->receive = receive; |
a6827c18 JL |
613 | mid->callback = callback; |
614 | mid->callback_data = cbdata; | |
9b7c18a2 | 615 | mid->handle = handle; |
7c9421e1 | 616 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 617 | |
ffc61ccb SP |
618 | /* put it on the pending_mid_q */ |
619 | spin_lock(&GlobalMid_Lock); | |
620 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
621 | spin_unlock(&GlobalMid_Lock); | |
622 | ||
93d2cb6c LL |
623 | /* |
624 | * Need to store the time in mid before calling I/O. For call_async, | |
625 | * I/O response may come back and free the mid entry on another thread. | |
626 | */ | |
627 | cifs_save_when_sent(mid); | |
789e6661 | 628 | cifs_in_send_inc(server); |
1f3a8f5f | 629 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 630 | cifs_in_send_dec(server); |
ad313cb8 | 631 | |
820962dc | 632 | if (rc < 0) { |
ad313cb8 | 633 | server->sequence_number -= 2; |
820962dc RV |
634 | cifs_delete_mid(mid); |
635 | } | |
636 | ||
a6827c18 | 637 | mutex_unlock(&server->srv_mutex); |
789e6661 | 638 | |
ffc61ccb SP |
639 | if (rc == 0) |
640 | return 0; | |
a6827c18 | 641 | |
cb7e9eab | 642 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
643 | return rc; |
644 | } | |
645 | ||
133672ef SF |
646 | /* |
647 | * | |
648 | * Send an SMB Request. No response info (other than return code) | |
649 | * needs to be parsed. | |
650 | * | |
651 | * flags indicate the type of request buffer and how long to wait | |
652 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
653 | * | |
654 | */ | |
655 | int | |
96daf2b0 | 656 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 657 | char *in_buf, int flags) |
133672ef SF |
658 | { |
659 | int rc; | |
660 | struct kvec iov[1]; | |
da502f7d | 661 | struct kvec rsp_iov; |
133672ef SF |
662 | int resp_buf_type; |
663 | ||
792af7b0 PS |
664 | iov[0].iov_base = in_buf; |
665 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 666 | flags |= CIFS_NO_RESP; |
da502f7d | 667 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 668 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 669 | |
133672ef SF |
670 | return rc; |
671 | } | |
672 | ||
053d5034 | 673 | static int |
3c1105df | 674 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
675 | { |
676 | int rc = 0; | |
677 | ||
f96637be JP |
678 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
679 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 680 | |
74dd92a8 | 681 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 682 | switch (mid->mid_state) { |
74dd92a8 | 683 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
684 | spin_unlock(&GlobalMid_Lock); |
685 | return rc; | |
74dd92a8 JL |
686 | case MID_RETRY_NEEDED: |
687 | rc = -EAGAIN; | |
688 | break; | |
71823baf JL |
689 | case MID_RESPONSE_MALFORMED: |
690 | rc = -EIO; | |
691 | break; | |
3c1105df JL |
692 | case MID_SHUTDOWN: |
693 | rc = -EHOSTDOWN; | |
694 | break; | |
74dd92a8 | 695 | default: |
3c1105df | 696 | list_del_init(&mid->qhead); |
f96637be JP |
697 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
698 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 699 | rc = -EIO; |
053d5034 JL |
700 | } |
701 | spin_unlock(&GlobalMid_Lock); | |
702 | ||
2b84a36c | 703 | DeleteMidQEntry(mid); |
053d5034 JL |
704 | return rc; |
705 | } | |
706 | ||
121b046a | 707 | static inline int |
fb2036d8 PS |
708 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
709 | struct mid_q_entry *mid) | |
76dcc26f | 710 | { |
121b046a | 711 | return server->ops->send_cancel ? |
fb2036d8 | 712 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
713 | } |
714 | ||
2c8f981d JL |
715 | int |
716 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
717 | bool log_error) | |
718 | { | |
792af7b0 | 719 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
720 | |
721 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
722 | |
723 | /* convert the length into a more usable form */ | |
38d77c50 | 724 | if (server->sign) { |
738f9de5 | 725 | struct kvec iov[2]; |
985e4ff0 | 726 | int rc = 0; |
738f9de5 PS |
727 | struct smb_rqst rqst = { .rq_iov = iov, |
728 | .rq_nvec = 2 }; | |
826a95e4 | 729 | |
738f9de5 PS |
730 | iov[0].iov_base = mid->resp_buf; |
731 | iov[0].iov_len = 4; | |
732 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
733 | iov[1].iov_len = len - 4; | |
2c8f981d | 734 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 735 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 736 | mid->sequence_number); |
985e4ff0 | 737 | if (rc) |
f96637be JP |
738 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
739 | rc); | |
2c8f981d JL |
740 | } |
741 | ||
742 | /* BB special case reconnect tid and uid here? */ | |
743 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
744 | } | |
745 | ||
fec344e3 JL |
746 | struct mid_q_entry * |
747 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
748 | { |
749 | int rc; | |
fec344e3 | 750 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
751 | struct mid_q_entry *mid; |
752 | ||
738f9de5 PS |
753 | if (rqst->rq_iov[0].iov_len != 4 || |
754 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
755 | return ERR_PTR(-EIO); | |
756 | ||
792af7b0 PS |
757 | rc = allocate_mid(ses, hdr, &mid); |
758 | if (rc) | |
fec344e3 JL |
759 | return ERR_PTR(rc); |
760 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
761 | if (rc) { | |
3c1bf7e4 | 762 | cifs_delete_mid(mid); |
fec344e3 JL |
763 | return ERR_PTR(rc); |
764 | } | |
765 | return mid; | |
792af7b0 PS |
766 | } |
767 | ||
b8f57ee8 | 768 | int |
738f9de5 PS |
769 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, |
770 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
771 | struct kvec *resp_iov) | |
7ee1af76 JA |
772 | { |
773 | int rc = 0; | |
a891f0f8 | 774 | int timeout, optype; |
7ee1af76 | 775 | struct mid_q_entry *midQ; |
a891f0f8 | 776 | unsigned int credits = 1; |
738f9de5 | 777 | char *buf; |
50c2f753 | 778 | |
a891f0f8 PS |
779 | timeout = flags & CIFS_TIMEOUT_MASK; |
780 | optype = flags & CIFS_OP_MASK; | |
133672ef | 781 | |
a891f0f8 | 782 | *resp_buf_type = CIFS_NO_BUFFER; /* no response buf yet */ |
7ee1af76 JA |
783 | |
784 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 785 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
786 | return -EIO; |
787 | } | |
788 | ||
da502f7d | 789 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 790 | return -ENOENT; |
7ee1af76 | 791 | |
792af7b0 PS |
792 | /* |
793 | * Ensure that we do not send more than 50 overlapping requests | |
794 | * to the same server. We may make this configurable later or | |
795 | * use ses->maxReq. | |
796 | */ | |
a891f0f8 | 797 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 798 | if (rc) |
7ee1af76 | 799 | return rc; |
7ee1af76 | 800 | |
792af7b0 PS |
801 | /* |
802 | * Make sure that we sign in the same order that we send on this socket | |
803 | * and avoid races inside tcp sendmsg code that could cause corruption | |
804 | * of smb data. | |
805 | */ | |
7ee1af76 | 806 | |
72ca545b | 807 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 808 | |
738f9de5 | 809 | midQ = ses->server->ops->setup_request(ses, rqst); |
fec344e3 | 810 | if (IS_ERR(midQ)) { |
72ca545b | 811 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 812 | /* Update # of requests on wire to server */ |
a891f0f8 | 813 | add_credits(ses->server, 1, optype); |
fec344e3 | 814 | return PTR_ERR(midQ); |
1da177e4 | 815 | } |
1da177e4 | 816 | |
7c9421e1 | 817 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 818 | cifs_in_send_inc(ses->server); |
1f3a8f5f | 819 | rc = smb_send_rqst(ses->server, 1, rqst, flags); |
789e6661 SF |
820 | cifs_in_send_dec(ses->server); |
821 | cifs_save_when_sent(midQ); | |
7ee1af76 | 822 | |
ad313cb8 JL |
823 | if (rc < 0) |
824 | ses->server->sequence_number -= 2; | |
72ca545b | 825 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 826 | |
da502f7d | 827 | if (rc < 0) |
7ee1af76 | 828 | goto out; |
4b8f930f | 829 | |
0d5ec281 | 830 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) |
c713c877 RS |
831 | smb311_update_preauth_hash(ses, rqst->rq_iov, |
832 | rqst->rq_nvec); | |
8bd68c6e | 833 | |
da502f7d | 834 | if (timeout == CIFS_ASYNC_OP) |
133672ef | 835 | goto out; |
d6e04ae6 | 836 | |
0ade640e | 837 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 838 | if (rc != 0) { |
38bd4906 | 839 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", midQ->mid); |
738f9de5 | 840 | send_cancel(ses->server, rqst, midQ); |
1be912dd | 841 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 842 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
38bd4906 | 843 | midQ->mid_flags |= MID_WAIT_CANCELLED; |
1be912dd JL |
844 | midQ->callback = DeleteMidQEntry; |
845 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 846 | add_credits(ses->server, 1, optype); |
1be912dd JL |
847 | return rc; |
848 | } | |
849 | spin_unlock(&GlobalMid_Lock); | |
850 | } | |
d6e04ae6 | 851 | |
3c1105df | 852 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 853 | if (rc != 0) { |
a891f0f8 | 854 | add_credits(ses->server, 1, optype); |
d6e04ae6 SF |
855 | return rc; |
856 | } | |
50c2f753 | 857 | |
7c9421e1 | 858 | if (!midQ->resp_buf || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
d6e04ae6 | 859 | rc = -EIO; |
f96637be | 860 | cifs_dbg(FYI, "Bad MID state?\n"); |
2b2bdfba SF |
861 | goto out; |
862 | } | |
863 | ||
792af7b0 | 864 | buf = (char *)midQ->resp_buf; |
da502f7d | 865 | resp_iov->iov_base = buf; |
e19b2bc0 | 866 | resp_iov->iov_len = midQ->resp_buf_size + |
93012bf9 | 867 | ses->server->vals->header_preamble_size; |
7c9421e1 | 868 | if (midQ->large_buf) |
a891f0f8 | 869 | *resp_buf_type = CIFS_LARGE_BUFFER; |
2c8f981d | 870 | else |
a891f0f8 PS |
871 | *resp_buf_type = CIFS_SMALL_BUFFER; |
872 | ||
0d5ec281 | 873 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { |
8bd68c6e | 874 | struct kvec iov = { |
c713c877 RS |
875 | .iov_base = resp_iov->iov_base, |
876 | .iov_len = resp_iov->iov_len | |
8bd68c6e AA |
877 | }; |
878 | smb311_update_preauth_hash(ses, &iov, 1); | |
879 | } | |
8bd68c6e | 880 | |
a891f0f8 | 881 | credits = ses->server->ops->get_credits(midQ); |
2b2bdfba | 882 | |
082d0642 PS |
883 | rc = ses->server->ops->check_receive(midQ, ses->server, |
884 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 885 | |
3c1bf7e4 | 886 | /* mark it so buf will not be freed by cifs_delete_mid */ |
2c8f981d JL |
887 | if ((flags & CIFS_NO_RESP) == 0) |
888 | midQ->resp_buf = NULL; | |
7ee1af76 | 889 | out: |
3c1bf7e4 | 890 | cifs_delete_mid(midQ); |
a891f0f8 | 891 | add_credits(ses->server, credits, optype); |
1da177e4 | 892 | |
d6e04ae6 SF |
893 | return rc; |
894 | } | |
1da177e4 | 895 | |
738f9de5 PS |
896 | int |
897 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
898 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
899 | const int flags, struct kvec *resp_iov) | |
900 | { | |
901 | struct smb_rqst rqst; | |
3cecf486 | 902 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
903 | int rc; |
904 | ||
3cecf486 | 905 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
906 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
907 | GFP_KERNEL); | |
117e3b7f SF |
908 | if (!new_iov) { |
909 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
910 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 911 | return -ENOMEM; |
117e3b7f | 912 | } |
3cecf486 RS |
913 | } else |
914 | new_iov = s_iov; | |
738f9de5 PS |
915 | |
916 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
917 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
918 | ||
919 | new_iov[0].iov_base = new_iov[1].iov_base; | |
920 | new_iov[0].iov_len = 4; | |
921 | new_iov[1].iov_base += 4; | |
922 | new_iov[1].iov_len -= 4; | |
923 | ||
924 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
925 | rqst.rq_iov = new_iov; | |
926 | rqst.rq_nvec = n_vec + 1; | |
927 | ||
928 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
929 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
930 | kfree(new_iov); | |
738f9de5 PS |
931 | return rc; |
932 | } | |
933 | ||
1da177e4 | 934 | int |
96daf2b0 | 935 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 936 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 937 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
938 | { |
939 | int rc = 0; | |
1da177e4 | 940 | struct mid_q_entry *midQ; |
fb2036d8 PS |
941 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
942 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
943 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
944 | |
945 | if (ses == NULL) { | |
f96637be | 946 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
947 | return -EIO; |
948 | } | |
79a58d1f | 949 | if (ses->server == NULL) { |
f96637be | 950 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
951 | return -EIO; |
952 | } | |
953 | ||
79a58d1f | 954 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
955 | return -ENOENT; |
956 | ||
79a58d1f | 957 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
958 | to the same server. We may make this configurable later or |
959 | use ses->maxReq */ | |
1da177e4 | 960 | |
fb2036d8 | 961 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 962 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 963 | len); |
6d9c6d54 VL |
964 | return -EIO; |
965 | } | |
966 | ||
a891f0f8 | 967 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
968 | if (rc) |
969 | return rc; | |
970 | ||
79a58d1f | 971 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
972 | and avoid races inside tcp sendmsg code that could cause corruption |
973 | of smb data */ | |
974 | ||
72ca545b | 975 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 976 | |
7ee1af76 JA |
977 | rc = allocate_mid(ses, in_buf, &midQ); |
978 | if (rc) { | |
72ca545b | 979 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 980 | /* Update # of requests on wire to server */ |
a891f0f8 | 981 | add_credits(ses->server, 1, 0); |
7ee1af76 | 982 | return rc; |
1da177e4 LT |
983 | } |
984 | ||
ad009ac9 | 985 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
986 | if (rc) { |
987 | mutex_unlock(&ses->server->srv_mutex); | |
988 | goto out; | |
989 | } | |
1da177e4 | 990 | |
7c9421e1 | 991 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
992 | |
993 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 994 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
995 | cifs_in_send_dec(ses->server); |
996 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
997 | |
998 | if (rc < 0) | |
999 | ses->server->sequence_number -= 2; | |
1000 | ||
72ca545b | 1001 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1002 | |
79a58d1f | 1003 | if (rc < 0) |
7ee1af76 JA |
1004 | goto out; |
1005 | ||
a891f0f8 | 1006 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 1007 | goto out; |
1da177e4 | 1008 | |
0ade640e | 1009 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1010 | if (rc != 0) { |
fb2036d8 | 1011 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1012 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1013 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1014 | /* no longer considered to be "in-flight" */ |
1015 | midQ->callback = DeleteMidQEntry; | |
1016 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 1017 | add_credits(ses->server, 1, 0); |
1be912dd JL |
1018 | return rc; |
1019 | } | |
1020 | spin_unlock(&GlobalMid_Lock); | |
1021 | } | |
1da177e4 | 1022 | |
3c1105df | 1023 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1024 | if (rc != 0) { |
a891f0f8 | 1025 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
1026 | return rc; |
1027 | } | |
50c2f753 | 1028 | |
2c8f981d | 1029 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1030 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1031 | rc = -EIO; |
f96637be | 1032 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1033 | goto out; |
1da177e4 | 1034 | } |
7ee1af76 | 1035 | |
d4e4854f | 1036 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1037 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1038 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1039 | out: |
3c1bf7e4 | 1040 | cifs_delete_mid(midQ); |
a891f0f8 | 1041 | add_credits(ses->server, 1, 0); |
1da177e4 | 1042 | |
7ee1af76 JA |
1043 | return rc; |
1044 | } | |
1da177e4 | 1045 | |
7ee1af76 JA |
1046 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1047 | blocking lock to return. */ | |
1048 | ||
1049 | static int | |
96daf2b0 | 1050 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1051 | struct smb_hdr *in_buf, |
1052 | struct smb_hdr *out_buf) | |
1053 | { | |
1054 | int bytes_returned; | |
96daf2b0 | 1055 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1056 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1057 | ||
1058 | /* We just modify the current in_buf to change | |
1059 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1060 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1061 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1062 | ||
1063 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1064 | pSMB->Timeout = 0; | |
88257360 | 1065 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1066 | |
1067 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1068 | &bytes_returned, 0); |
7ee1af76 JA |
1069 | } |
1070 | ||
1071 | int | |
96daf2b0 | 1072 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1073 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1074 | int *pbytes_returned) | |
1075 | { | |
1076 | int rc = 0; | |
1077 | int rstart = 0; | |
7ee1af76 | 1078 | struct mid_q_entry *midQ; |
96daf2b0 | 1079 | struct cifs_ses *ses; |
fb2036d8 PS |
1080 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1081 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1082 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1083 | |
1084 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1085 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1086 | return -EIO; |
1087 | } | |
1088 | ses = tcon->ses; | |
1089 | ||
79a58d1f | 1090 | if (ses->server == NULL) { |
f96637be | 1091 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1092 | return -EIO; |
1093 | } | |
1094 | ||
79a58d1f | 1095 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1096 | return -ENOENT; |
1097 | ||
79a58d1f | 1098 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1099 | to the same server. We may make this configurable later or |
1100 | use ses->maxReq */ | |
1101 | ||
fb2036d8 | 1102 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1103 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1104 | len); |
6d9c6d54 VL |
1105 | return -EIO; |
1106 | } | |
1107 | ||
a891f0f8 | 1108 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1109 | if (rc) |
1110 | return rc; | |
1111 | ||
79a58d1f | 1112 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1113 | and avoid races inside tcp sendmsg code that could cause corruption |
1114 | of smb data */ | |
1115 | ||
72ca545b | 1116 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1117 | |
1118 | rc = allocate_mid(ses, in_buf, &midQ); | |
1119 | if (rc) { | |
72ca545b | 1120 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1121 | return rc; |
1122 | } | |
1123 | ||
7ee1af76 | 1124 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1125 | if (rc) { |
3c1bf7e4 | 1126 | cifs_delete_mid(midQ); |
829049cb VL |
1127 | mutex_unlock(&ses->server->srv_mutex); |
1128 | return rc; | |
1129 | } | |
1da177e4 | 1130 | |
7c9421e1 | 1131 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1132 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1133 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1134 | cifs_in_send_dec(ses->server); |
1135 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1136 | |
1137 | if (rc < 0) | |
1138 | ses->server->sequence_number -= 2; | |
1139 | ||
72ca545b | 1140 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1141 | |
79a58d1f | 1142 | if (rc < 0) { |
3c1bf7e4 | 1143 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1144 | return rc; |
1145 | } | |
1146 | ||
1147 | /* Wait for a reply - allow signals to interrupt. */ | |
1148 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1149 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1150 | ((ses->server->tcpStatus != CifsGood) && |
1151 | (ses->server->tcpStatus != CifsNew))); | |
1152 | ||
1153 | /* Were we interrupted by a signal ? */ | |
1154 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1155 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1156 | ((ses->server->tcpStatus == CifsGood) || |
1157 | (ses->server->tcpStatus == CifsNew))) { | |
1158 | ||
1159 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1160 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1161 | blocking lock to return. */ | |
fb2036d8 | 1162 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1163 | if (rc) { |
3c1bf7e4 | 1164 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1165 | return rc; |
1166 | } | |
1167 | } else { | |
1168 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1169 | to cause the blocking lock to return. */ | |
1170 | ||
1171 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1172 | ||
1173 | /* If we get -ENOLCK back the lock may have | |
1174 | already been removed. Don't exit in this case. */ | |
1175 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1176 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1177 | return rc; |
1178 | } | |
1179 | } | |
1180 | ||
1be912dd JL |
1181 | rc = wait_for_response(ses->server, midQ); |
1182 | if (rc) { | |
fb2036d8 | 1183 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1184 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1185 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1186 | /* no longer considered to be "in-flight" */ |
1187 | midQ->callback = DeleteMidQEntry; | |
1188 | spin_unlock(&GlobalMid_Lock); | |
1189 | return rc; | |
1190 | } | |
1191 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1192 | } |
1be912dd JL |
1193 | |
1194 | /* We got the response - restart system call. */ | |
1195 | rstart = 1; | |
7ee1af76 JA |
1196 | } |
1197 | ||
3c1105df | 1198 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1199 | if (rc != 0) |
7ee1af76 | 1200 | return rc; |
50c2f753 | 1201 | |
17c8bfed | 1202 | /* rcvd frame is ok */ |
7c9421e1 | 1203 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1204 | rc = -EIO; |
f96637be | 1205 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1206 | goto out; |
1207 | } | |
1da177e4 | 1208 | |
d4e4854f | 1209 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1210 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1211 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1212 | out: |
3c1bf7e4 | 1213 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1214 | if (rstart && rc == -EACCES) |
1215 | return -ERESTARTSYS; | |
1da177e4 LT |
1216 | return rc; |
1217 | } |