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 */ | |
020eec5f SF |
118 | if (time_after(now, midEntry->when_alloc + HZ) && |
119 | (midEntry->command != command)) { | |
120 | trace_smb3_slow_rsp(le16_to_cpu(midEntry->command), | |
121 | midEntry->mid, midEntry->pid, | |
122 | midEntry->when_sent, midEntry->when_received); | |
123 | if (cifsFYI & CIFS_TIMER) { | |
0b456f04 | 124 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 125 | midEntry->command, midEntry->mid); |
0b456f04 | 126 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
127 | now - midEntry->when_alloc, |
128 | now - midEntry->when_sent, | |
129 | now - midEntry->when_received); | |
130 | } | |
131 | } | |
132 | #endif | |
696e420b | 133 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
134 | } |
135 | ||
3c1bf7e4 PS |
136 | void |
137 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
138 | { |
139 | spin_lock(&GlobalMid_Lock); | |
140 | list_del(&mid->qhead); | |
141 | spin_unlock(&GlobalMid_Lock); | |
142 | ||
143 | DeleteMidQEntry(mid); | |
144 | } | |
145 | ||
6f49f46b JL |
146 | /* |
147 | * smb_send_kvec - send an array of kvecs to the server | |
148 | * @server: Server to send the data to | |
3ab3f2a1 | 149 | * @smb_msg: Message to send |
6f49f46b JL |
150 | * @sent: amount of data sent on socket is stored here |
151 | * | |
152 | * Our basic "send data to server" function. Should be called with srv_mutex | |
153 | * held. The caller is responsible for handling the results. | |
154 | */ | |
d6e04ae6 | 155 | static int |
3ab3f2a1 AV |
156 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
157 | size_t *sent) | |
1da177e4 LT |
158 | { |
159 | int rc = 0; | |
3ab3f2a1 | 160 | int retries = 0; |
edf1ae40 | 161 | struct socket *ssocket = server->ssocket; |
50c2f753 | 162 | |
6f49f46b JL |
163 | *sent = 0; |
164 | ||
3ab3f2a1 AV |
165 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
166 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
167 | smb_msg->msg_control = NULL; | |
168 | smb_msg->msg_controllen = 0; | |
0496e02d | 169 | if (server->noblocksnd) |
3ab3f2a1 | 170 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 171 | else |
3ab3f2a1 | 172 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 173 | |
3ab3f2a1 | 174 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
175 | /* |
176 | * If blocking send, we try 3 times, since each can block | |
177 | * for 5 seconds. For nonblocking we have to try more | |
178 | * but wait increasing amounts of time allowing time for | |
179 | * socket to clear. The overall time we wait in either | |
180 | * case to send on the socket is about 15 seconds. | |
181 | * Similarly we wait for 15 seconds for a response from | |
182 | * the server in SendReceive[2] for the server to send | |
183 | * a response back for most types of requests (except | |
184 | * SMB Write past end of file which can be slow, and | |
185 | * blocking lock operations). NFS waits slightly longer | |
186 | * than CIFS, but this can make it take longer for | |
187 | * nonresponsive servers to be detected and 15 seconds | |
188 | * is more than enough time for modern networks to | |
189 | * send a packet. In most cases if we fail to send | |
190 | * after the retries we will kill the socket and | |
191 | * reconnect which may clear the network problem. | |
192 | */ | |
3ab3f2a1 | 193 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 194 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
195 | retries++; |
196 | if (retries >= 14 || | |
197 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
198 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
199 | ssocket); | |
3ab3f2a1 | 200 | return -EAGAIN; |
1da177e4 | 201 | } |
3ab3f2a1 | 202 | msleep(1 << retries); |
1da177e4 LT |
203 | continue; |
204 | } | |
6f49f46b | 205 | |
79a58d1f | 206 | if (rc < 0) |
3ab3f2a1 | 207 | return rc; |
6f49f46b | 208 | |
79a58d1f | 209 | if (rc == 0) { |
3e84469d SF |
210 | /* should never happen, letting socket clear before |
211 | retrying is our only obvious option here */ | |
f96637be | 212 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
213 | msleep(500); |
214 | continue; | |
d6e04ae6 | 215 | } |
6f49f46b | 216 | |
3ab3f2a1 AV |
217 | /* send was at least partially successful */ |
218 | *sent += rc; | |
219 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 220 | } |
3ab3f2a1 | 221 | return 0; |
97bc00b3 JL |
222 | } |
223 | ||
35e2cc1b | 224 | unsigned long |
81f39f95 | 225 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
226 | { |
227 | unsigned int i; | |
35e2cc1b PA |
228 | struct kvec *iov; |
229 | int nvec; | |
a26054d1 JL |
230 | unsigned long buflen = 0; |
231 | ||
81f39f95 RS |
232 | if (server->vals->header_preamble_size == 0 && |
233 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
234 | iov = &rqst->rq_iov[1]; |
235 | nvec = rqst->rq_nvec - 1; | |
236 | } else { | |
237 | iov = rqst->rq_iov; | |
238 | nvec = rqst->rq_nvec; | |
239 | } | |
240 | ||
a26054d1 | 241 | /* total up iov array first */ |
35e2cc1b | 242 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
243 | buflen += iov[i].iov_len; |
244 | ||
c06a0f2d LL |
245 | /* |
246 | * Add in the page array if there is one. The caller needs to make | |
247 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
248 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
249 | * PAGE_SIZE. | |
250 | */ | |
a26054d1 | 251 | if (rqst->rq_npages) { |
c06a0f2d LL |
252 | if (rqst->rq_npages == 1) |
253 | buflen += rqst->rq_tailsz; | |
254 | else { | |
255 | /* | |
256 | * If there is more than one page, calculate the | |
257 | * buffer length based on rq_offset and rq_tailsz | |
258 | */ | |
259 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
260 | rqst->rq_offset; | |
261 | buflen += rqst->rq_tailsz; | |
262 | } | |
a26054d1 JL |
263 | } |
264 | ||
265 | return buflen; | |
266 | } | |
267 | ||
6f49f46b | 268 | static int |
07cd952f RS |
269 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
270 | struct smb_rqst *rqst) | |
6f49f46b | 271 | { |
07cd952f RS |
272 | int rc = 0; |
273 | struct kvec *iov; | |
274 | int n_vec; | |
275 | unsigned int send_length = 0; | |
276 | unsigned int i, j; | |
3ab3f2a1 | 277 | size_t total_len = 0, sent, size; |
b8eed283 | 278 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 279 | struct msghdr smb_msg; |
b8eed283 | 280 | int val = 1; |
c713c877 RS |
281 | __be32 rfc1002_marker; |
282 | ||
9762c2d0 | 283 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
81f39f95 | 284 | rc = smbd_send(server, rqst); |
9762c2d0 LL |
285 | goto smbd_done; |
286 | } | |
ea702b80 JL |
287 | if (ssocket == NULL) |
288 | return -ENOTSOCK; | |
289 | ||
b8eed283 JL |
290 | /* cork the socket */ |
291 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
292 | (char *)&val, sizeof(val)); | |
293 | ||
07cd952f | 294 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 295 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
296 | rfc1002_marker = cpu_to_be32(send_length); |
297 | ||
c713c877 RS |
298 | /* Generate a rfc1002 marker for SMB2+ */ |
299 | if (server->vals->header_preamble_size == 0) { | |
300 | struct kvec hiov = { | |
301 | .iov_base = &rfc1002_marker, | |
302 | .iov_len = 4 | |
303 | }; | |
304 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov, | |
305 | 1, 4); | |
306 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
307 | if (rc < 0) | |
308 | goto uncork; | |
309 | ||
310 | total_len += sent; | |
311 | send_length += 4; | |
312 | } | |
313 | ||
662bf5bc PA |
314 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
315 | ||
07cd952f RS |
316 | for (j = 0; j < num_rqst; j++) { |
317 | iov = rqst[j].rq_iov; | |
318 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 319 | |
07cd952f | 320 | size = 0; |
662bf5bc PA |
321 | for (i = 0; i < n_vec; i++) { |
322 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 323 | size += iov[i].iov_len; |
662bf5bc | 324 | } |
97bc00b3 | 325 | |
07cd952f RS |
326 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, |
327 | iov, n_vec, size); | |
97bc00b3 | 328 | |
3ab3f2a1 | 329 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 330 | if (rc < 0) |
07cd952f | 331 | goto uncork; |
97bc00b3 JL |
332 | |
333 | total_len += sent; | |
07cd952f RS |
334 | |
335 | /* now walk the page array and send each page in it */ | |
336 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
337 | struct bio_vec bvec; | |
338 | ||
339 | bvec.bv_page = rqst[j].rq_pages[i]; | |
340 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
341 | &bvec.bv_offset); | |
342 | ||
343 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, | |
344 | &bvec, 1, bvec.bv_len); | |
345 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
346 | if (rc < 0) | |
347 | break; | |
348 | ||
349 | total_len += sent; | |
350 | } | |
97bc00b3 | 351 | } |
1da177e4 | 352 | |
97bc00b3 | 353 | uncork: |
b8eed283 JL |
354 | /* uncork it */ |
355 | val = 0; | |
356 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
357 | (char *)&val, sizeof(val)); | |
358 | ||
c713c877 | 359 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 360 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 361 | send_length, total_len); |
6f49f46b JL |
362 | /* |
363 | * If we have only sent part of an SMB then the next SMB could | |
364 | * be taken as the remainder of this one. We need to kill the | |
365 | * socket so the server throws away the partial SMB | |
366 | */ | |
edf1ae40 | 367 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
368 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
369 | server->hostname); | |
edf1ae40 | 370 | } |
9762c2d0 | 371 | smbd_done: |
d804d41d | 372 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
373 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
374 | rc); | |
d804d41d | 375 | else |
1da177e4 | 376 | rc = 0; |
1da177e4 LT |
377 | |
378 | return rc; | |
379 | } | |
380 | ||
1f3a8f5f | 381 | #define MAX_COMPOUND 5 |
b2c96de7 | 382 | |
6f49f46b | 383 | static int |
1f3a8f5f RS |
384 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
385 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 386 | { |
b2c96de7 RS |
387 | struct kvec iov; |
388 | struct smb2_transform_hdr tr_hdr; | |
389 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
390 | int rc; |
391 | ||
392 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
393 | return __smb_send_rqst(server, num_rqst, rqst); |
394 | ||
395 | if (num_rqst > MAX_COMPOUND - 1) | |
396 | return -ENOMEM; | |
7fb8986e | 397 | |
b2c96de7 RS |
398 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
399 | memset(&iov, 0, sizeof(iov)); | |
400 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
401 | ||
402 | iov.iov_base = &tr_hdr; | |
403 | iov.iov_len = sizeof(tr_hdr); | |
404 | cur_rqst[0].rq_iov = &iov; | |
405 | cur_rqst[0].rq_nvec = 1; | |
406 | ||
407 | if (!server->ops->init_transform_rq) { | |
408 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
409 | "is missing\n"); | |
7fb8986e PS |
410 | return -EIO; |
411 | } | |
6f49f46b | 412 | |
1f3a8f5f RS |
413 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
414 | &cur_rqst[0], rqst); | |
7fb8986e PS |
415 | if (rc) |
416 | return rc; | |
417 | ||
1f3a8f5f RS |
418 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
419 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 420 | return rc; |
6f49f46b JL |
421 | } |
422 | ||
0496e02d JL |
423 | int |
424 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
425 | unsigned int smb_buf_length) | |
426 | { | |
738f9de5 | 427 | struct kvec iov[2]; |
7fb8986e PS |
428 | struct smb_rqst rqst = { .rq_iov = iov, |
429 | .rq_nvec = 2 }; | |
0496e02d | 430 | |
738f9de5 PS |
431 | iov[0].iov_base = smb_buffer; |
432 | iov[0].iov_len = 4; | |
433 | iov[1].iov_base = (char *)smb_buffer + 4; | |
434 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 435 | |
07cd952f | 436 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
437 | } |
438 | ||
fc40f9cf | 439 | static int |
a891f0f8 | 440 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 441 | int *credits) |
1da177e4 | 442 | { |
5bc59498 PS |
443 | int rc; |
444 | ||
fc40f9cf | 445 | spin_lock(&server->req_lock); |
a891f0f8 | 446 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 447 | /* oplock breaks must not be held up */ |
fc40f9cf | 448 | server->in_flight++; |
bc205ed1 | 449 | *credits -= 1; |
fc40f9cf | 450 | spin_unlock(&server->req_lock); |
27a97a61 VL |
451 | return 0; |
452 | } | |
453 | ||
27a97a61 | 454 | while (1) { |
bc205ed1 | 455 | if (*credits <= 0) { |
fc40f9cf | 456 | spin_unlock(&server->req_lock); |
789e6661 | 457 | cifs_num_waiters_inc(server); |
5bc59498 | 458 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 459 | has_credits(server, credits)); |
789e6661 | 460 | cifs_num_waiters_dec(server); |
5bc59498 PS |
461 | if (rc) |
462 | return rc; | |
fc40f9cf | 463 | spin_lock(&server->req_lock); |
27a97a61 | 464 | } else { |
c5797a94 | 465 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 466 | spin_unlock(&server->req_lock); |
27a97a61 | 467 | return -ENOENT; |
1da177e4 | 468 | } |
27a97a61 | 469 | |
2d86dbc9 PS |
470 | /* |
471 | * Can not count locking commands against total | |
472 | * as they are allowed to block on server. | |
473 | */ | |
27a97a61 VL |
474 | |
475 | /* update # of requests on the wire to server */ | |
a891f0f8 | 476 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 477 | *credits -= 1; |
fc40f9cf | 478 | server->in_flight++; |
2d86dbc9 | 479 | } |
fc40f9cf | 480 | spin_unlock(&server->req_lock); |
27a97a61 | 481 | break; |
1da177e4 LT |
482 | } |
483 | } | |
7ee1af76 JA |
484 | return 0; |
485 | } | |
1da177e4 | 486 | |
bc205ed1 | 487 | static int |
a891f0f8 PS |
488 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
489 | const int optype) | |
bc205ed1 | 490 | { |
eb4c7df6 SP |
491 | int *val; |
492 | ||
493 | val = server->ops->get_credits_field(server, optype); | |
494 | /* Since an echo is already inflight, no need to wait to send another */ | |
495 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
496 | return -EAGAIN; | |
497 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
498 | } |
499 | ||
cb7e9eab PS |
500 | int |
501 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
502 | unsigned int *num, unsigned int *credits) | |
503 | { | |
504 | *num = size; | |
505 | *credits = 0; | |
506 | return 0; | |
507 | } | |
508 | ||
96daf2b0 | 509 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
510 | struct mid_q_entry **ppmidQ) |
511 | { | |
1da177e4 | 512 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 513 | return -ENOENT; |
8fbbd365 VL |
514 | } |
515 | ||
516 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 517 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 518 | return -EAGAIN; |
8fbbd365 VL |
519 | } |
520 | ||
7f48558e | 521 | if (ses->status == CifsNew) { |
79a58d1f | 522 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 523 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 524 | return -EAGAIN; |
ad7a2926 | 525 | /* else ok - we are setting up session */ |
1da177e4 | 526 | } |
7f48558e SP |
527 | |
528 | if (ses->status == CifsExiting) { | |
529 | /* check if SMB session is bad because we are setting it up */ | |
530 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
531 | return -EAGAIN; | |
532 | /* else ok - we are shutting down session */ | |
533 | } | |
534 | ||
24b9b06b | 535 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 536 | if (*ppmidQ == NULL) |
7ee1af76 | 537 | return -ENOMEM; |
ddc8cf8f JL |
538 | spin_lock(&GlobalMid_Lock); |
539 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
540 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
541 | return 0; |
542 | } | |
543 | ||
0ade640e JL |
544 | static int |
545 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 546 | { |
0ade640e | 547 | int error; |
7ee1af76 | 548 | |
5853cc2a | 549 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 550 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
551 | if (error < 0) |
552 | return -ERESTARTSYS; | |
7ee1af76 | 553 | |
0ade640e | 554 | return 0; |
7ee1af76 JA |
555 | } |
556 | ||
fec344e3 JL |
557 | struct mid_q_entry * |
558 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
559 | { |
560 | int rc; | |
fec344e3 | 561 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
562 | struct mid_q_entry *mid; |
563 | ||
738f9de5 PS |
564 | if (rqst->rq_iov[0].iov_len != 4 || |
565 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
566 | return ERR_PTR(-EIO); | |
567 | ||
792af7b0 | 568 | /* enable signing if server requires it */ |
38d77c50 | 569 | if (server->sign) |
792af7b0 PS |
570 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
571 | ||
572 | mid = AllocMidQEntry(hdr, server); | |
573 | if (mid == NULL) | |
fec344e3 | 574 | return ERR_PTR(-ENOMEM); |
792af7b0 | 575 | |
fec344e3 | 576 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
577 | if (rc) { |
578 | DeleteMidQEntry(mid); | |
fec344e3 | 579 | return ERR_PTR(rc); |
ffc61ccb SP |
580 | } |
581 | ||
fec344e3 | 582 | return mid; |
792af7b0 | 583 | } |
133672ef | 584 | |
a6827c18 JL |
585 | /* |
586 | * Send a SMB request and set the callback function in the mid to handle | |
587 | * the result. Caller is responsible for dealing with timeouts. | |
588 | */ | |
589 | int | |
fec344e3 | 590 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
591 | mid_receive_t *receive, mid_callback_t *callback, |
592 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 593 | { |
a891f0f8 | 594 | int rc, timeout, optype; |
a6827c18 | 595 | struct mid_q_entry *mid; |
cb7e9eab | 596 | unsigned int credits = 0; |
a6827c18 | 597 | |
a891f0f8 PS |
598 | timeout = flags & CIFS_TIMEOUT_MASK; |
599 | optype = flags & CIFS_OP_MASK; | |
600 | ||
cb7e9eab PS |
601 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
602 | rc = wait_for_free_request(server, timeout, optype); | |
603 | if (rc) | |
604 | return rc; | |
605 | credits = 1; | |
606 | } | |
a6827c18 JL |
607 | |
608 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
609 | mid = server->ops->setup_async_request(server, rqst); |
610 | if (IS_ERR(mid)) { | |
a6827c18 | 611 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 612 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 613 | return PTR_ERR(mid); |
a6827c18 JL |
614 | } |
615 | ||
44d22d84 | 616 | mid->receive = receive; |
a6827c18 JL |
617 | mid->callback = callback; |
618 | mid->callback_data = cbdata; | |
9b7c18a2 | 619 | mid->handle = handle; |
7c9421e1 | 620 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 621 | |
ffc61ccb SP |
622 | /* put it on the pending_mid_q */ |
623 | spin_lock(&GlobalMid_Lock); | |
624 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
625 | spin_unlock(&GlobalMid_Lock); | |
626 | ||
93d2cb6c LL |
627 | /* |
628 | * Need to store the time in mid before calling I/O. For call_async, | |
629 | * I/O response may come back and free the mid entry on another thread. | |
630 | */ | |
631 | cifs_save_when_sent(mid); | |
789e6661 | 632 | cifs_in_send_inc(server); |
1f3a8f5f | 633 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 634 | cifs_in_send_dec(server); |
ad313cb8 | 635 | |
820962dc | 636 | if (rc < 0) { |
ad313cb8 | 637 | server->sequence_number -= 2; |
820962dc RV |
638 | cifs_delete_mid(mid); |
639 | } | |
640 | ||
a6827c18 | 641 | mutex_unlock(&server->srv_mutex); |
789e6661 | 642 | |
ffc61ccb SP |
643 | if (rc == 0) |
644 | return 0; | |
a6827c18 | 645 | |
cb7e9eab | 646 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
647 | return rc; |
648 | } | |
649 | ||
133672ef SF |
650 | /* |
651 | * | |
652 | * Send an SMB Request. No response info (other than return code) | |
653 | * needs to be parsed. | |
654 | * | |
655 | * flags indicate the type of request buffer and how long to wait | |
656 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
657 | * | |
658 | */ | |
659 | int | |
96daf2b0 | 660 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 661 | char *in_buf, int flags) |
133672ef SF |
662 | { |
663 | int rc; | |
664 | struct kvec iov[1]; | |
da502f7d | 665 | struct kvec rsp_iov; |
133672ef SF |
666 | int resp_buf_type; |
667 | ||
792af7b0 PS |
668 | iov[0].iov_base = in_buf; |
669 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 670 | flags |= CIFS_NO_RESP; |
da502f7d | 671 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 672 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 673 | |
133672ef SF |
674 | return rc; |
675 | } | |
676 | ||
053d5034 | 677 | static int |
3c1105df | 678 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
679 | { |
680 | int rc = 0; | |
681 | ||
f96637be JP |
682 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
683 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 684 | |
74dd92a8 | 685 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 686 | switch (mid->mid_state) { |
74dd92a8 | 687 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
688 | spin_unlock(&GlobalMid_Lock); |
689 | return rc; | |
74dd92a8 JL |
690 | case MID_RETRY_NEEDED: |
691 | rc = -EAGAIN; | |
692 | break; | |
71823baf JL |
693 | case MID_RESPONSE_MALFORMED: |
694 | rc = -EIO; | |
695 | break; | |
3c1105df JL |
696 | case MID_SHUTDOWN: |
697 | rc = -EHOSTDOWN; | |
698 | break; | |
74dd92a8 | 699 | default: |
3c1105df | 700 | list_del_init(&mid->qhead); |
f96637be JP |
701 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
702 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 703 | rc = -EIO; |
053d5034 JL |
704 | } |
705 | spin_unlock(&GlobalMid_Lock); | |
706 | ||
2b84a36c | 707 | DeleteMidQEntry(mid); |
053d5034 JL |
708 | return rc; |
709 | } | |
710 | ||
121b046a | 711 | static inline int |
fb2036d8 PS |
712 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
713 | struct mid_q_entry *mid) | |
76dcc26f | 714 | { |
121b046a | 715 | return server->ops->send_cancel ? |
fb2036d8 | 716 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
717 | } |
718 | ||
2c8f981d JL |
719 | int |
720 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
721 | bool log_error) | |
722 | { | |
792af7b0 | 723 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
724 | |
725 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
726 | |
727 | /* convert the length into a more usable form */ | |
38d77c50 | 728 | if (server->sign) { |
738f9de5 | 729 | struct kvec iov[2]; |
985e4ff0 | 730 | int rc = 0; |
738f9de5 PS |
731 | struct smb_rqst rqst = { .rq_iov = iov, |
732 | .rq_nvec = 2 }; | |
826a95e4 | 733 | |
738f9de5 PS |
734 | iov[0].iov_base = mid->resp_buf; |
735 | iov[0].iov_len = 4; | |
736 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
737 | iov[1].iov_len = len - 4; | |
2c8f981d | 738 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 739 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 740 | mid->sequence_number); |
985e4ff0 | 741 | if (rc) |
f96637be JP |
742 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
743 | rc); | |
2c8f981d JL |
744 | } |
745 | ||
746 | /* BB special case reconnect tid and uid here? */ | |
747 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
748 | } | |
749 | ||
fec344e3 JL |
750 | struct mid_q_entry * |
751 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
752 | { |
753 | int rc; | |
fec344e3 | 754 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
755 | struct mid_q_entry *mid; |
756 | ||
738f9de5 PS |
757 | if (rqst->rq_iov[0].iov_len != 4 || |
758 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
759 | return ERR_PTR(-EIO); | |
760 | ||
792af7b0 PS |
761 | rc = allocate_mid(ses, hdr, &mid); |
762 | if (rc) | |
fec344e3 JL |
763 | return ERR_PTR(rc); |
764 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
765 | if (rc) { | |
3c1bf7e4 | 766 | cifs_delete_mid(mid); |
fec344e3 JL |
767 | return ERR_PTR(rc); |
768 | } | |
769 | return mid; | |
792af7b0 PS |
770 | } |
771 | ||
b8f57ee8 | 772 | int |
e0bba0b8 RS |
773 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
774 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
775 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 776 | { |
e0bba0b8 | 777 | int i, j, rc = 0; |
a891f0f8 | 778 | int timeout, optype; |
e0bba0b8 | 779 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
a891f0f8 | 780 | unsigned int credits = 1; |
738f9de5 | 781 | char *buf; |
50c2f753 | 782 | |
a891f0f8 PS |
783 | timeout = flags & CIFS_TIMEOUT_MASK; |
784 | optype = flags & CIFS_OP_MASK; | |
133672ef | 785 | |
e0bba0b8 RS |
786 | for (i = 0; i < num_rqst; i++) |
787 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
788 | |
789 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 790 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
791 | return -EIO; |
792 | } | |
793 | ||
da502f7d | 794 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 795 | return -ENOENT; |
7ee1af76 | 796 | |
792af7b0 PS |
797 | /* |
798 | * Ensure that we do not send more than 50 overlapping requests | |
799 | * to the same server. We may make this configurable later or | |
800 | * use ses->maxReq. | |
801 | */ | |
a891f0f8 | 802 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 803 | if (rc) |
7ee1af76 | 804 | return rc; |
7ee1af76 | 805 | |
792af7b0 PS |
806 | /* |
807 | * Make sure that we sign in the same order that we send on this socket | |
808 | * and avoid races inside tcp sendmsg code that could cause corruption | |
809 | * of smb data. | |
810 | */ | |
7ee1af76 | 811 | |
72ca545b | 812 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 813 | |
e0bba0b8 RS |
814 | for (i = 0; i < num_rqst; i++) { |
815 | midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); | |
816 | if (IS_ERR(midQ[i])) { | |
817 | for (j = 0; j < i; j++) | |
818 | cifs_delete_mid(midQ[j]); | |
819 | mutex_unlock(&ses->server->srv_mutex); | |
820 | /* Update # of requests on wire to server */ | |
821 | add_credits(ses->server, 1, optype); | |
822 | return PTR_ERR(midQ[i]); | |
823 | } | |
824 | ||
825 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
1da177e4 | 826 | } |
1da177e4 | 827 | |
789e6661 | 828 | cifs_in_send_inc(ses->server); |
e0bba0b8 | 829 | rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); |
789e6661 | 830 | cifs_in_send_dec(ses->server); |
e0bba0b8 RS |
831 | |
832 | for (i = 0; i < num_rqst; i++) | |
833 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 834 | |
ad313cb8 JL |
835 | if (rc < 0) |
836 | ses->server->sequence_number -= 2; | |
e0bba0b8 | 837 | |
72ca545b | 838 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 839 | |
e0bba0b8 RS |
840 | for (i = 0; i < num_rqst; i++) { |
841 | if (rc < 0) | |
842 | goto out; | |
843 | ||
844 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
845 | smb311_update_preauth_hash(ses, rqst[i].rq_iov, | |
846 | rqst[i].rq_nvec); | |
847 | ||
848 | if (timeout == CIFS_ASYNC_OP) | |
849 | goto out; | |
850 | ||
851 | rc = wait_for_response(ses->server, midQ[i]); | |
852 | if (rc != 0) { | |
853 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", | |
854 | midQ[i]->mid); | |
855 | send_cancel(ses->server, &rqst[i], midQ[i]); | |
856 | spin_lock(&GlobalMid_Lock); | |
857 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
858 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
859 | midQ[i]->callback = DeleteMidQEntry; | |
860 | spin_unlock(&GlobalMid_Lock); | |
861 | add_credits(ses->server, 1, optype); | |
862 | return rc; | |
863 | } | |
1be912dd | 864 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 RS |
865 | } |
866 | ||
867 | rc = cifs_sync_mid_result(midQ[i], ses->server); | |
868 | if (rc != 0) { | |
a891f0f8 | 869 | add_credits(ses->server, 1, optype); |
1be912dd JL |
870 | return rc; |
871 | } | |
2b2bdfba | 872 | |
e0bba0b8 RS |
873 | if (!midQ[i]->resp_buf || |
874 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
875 | rc = -EIO; | |
876 | cifs_dbg(FYI, "Bad MID state?\n"); | |
877 | goto out; | |
878 | } | |
a891f0f8 | 879 | |
e0bba0b8 RS |
880 | buf = (char *)midQ[i]->resp_buf; |
881 | resp_iov[i].iov_base = buf; | |
882 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
883 | ses->server->vals->header_preamble_size; | |
884 | ||
885 | if (midQ[i]->large_buf) | |
886 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
887 | else | |
888 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
889 | ||
890 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
891 | struct kvec iov = { | |
892 | .iov_base = resp_iov[i].iov_base, | |
893 | .iov_len = resp_iov[i].iov_len | |
894 | }; | |
895 | smb311_update_preauth_hash(ses, &iov, 1); | |
896 | } | |
8bd68c6e | 897 | |
e0bba0b8 | 898 | credits = ses->server->ops->get_credits(midQ[i]); |
2b2bdfba | 899 | |
e0bba0b8 RS |
900 | rc = ses->server->ops->check_receive(midQ[i], ses->server, |
901 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 902 | |
e0bba0b8 RS |
903 | /* mark it so buf will not be freed by cifs_delete_mid */ |
904 | if ((flags & CIFS_NO_RESP) == 0) | |
905 | midQ[i]->resp_buf = NULL; | |
906 | } | |
7ee1af76 | 907 | out: |
e0bba0b8 RS |
908 | for (i = 0; i < num_rqst; i++) |
909 | cifs_delete_mid(midQ[i]); | |
a891f0f8 | 910 | add_credits(ses->server, credits, optype); |
1da177e4 | 911 | |
d6e04ae6 SF |
912 | return rc; |
913 | } | |
1da177e4 | 914 | |
e0bba0b8 RS |
915 | int |
916 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
917 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
918 | struct kvec *resp_iov) | |
919 | { | |
920 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
921 | resp_iov); | |
922 | } | |
923 | ||
738f9de5 PS |
924 | int |
925 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
926 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
927 | const int flags, struct kvec *resp_iov) | |
928 | { | |
929 | struct smb_rqst rqst; | |
3cecf486 | 930 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
931 | int rc; |
932 | ||
3cecf486 | 933 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
934 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
935 | GFP_KERNEL); | |
117e3b7f SF |
936 | if (!new_iov) { |
937 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
938 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 939 | return -ENOMEM; |
117e3b7f | 940 | } |
3cecf486 RS |
941 | } else |
942 | new_iov = s_iov; | |
738f9de5 PS |
943 | |
944 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
945 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
946 | ||
947 | new_iov[0].iov_base = new_iov[1].iov_base; | |
948 | new_iov[0].iov_len = 4; | |
949 | new_iov[1].iov_base += 4; | |
950 | new_iov[1].iov_len -= 4; | |
951 | ||
952 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
953 | rqst.rq_iov = new_iov; | |
954 | rqst.rq_nvec = n_vec + 1; | |
955 | ||
956 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
957 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
958 | kfree(new_iov); | |
738f9de5 PS |
959 | return rc; |
960 | } | |
961 | ||
1da177e4 | 962 | int |
96daf2b0 | 963 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 964 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 965 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
966 | { |
967 | int rc = 0; | |
1da177e4 | 968 | struct mid_q_entry *midQ; |
fb2036d8 PS |
969 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
970 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
971 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
972 | |
973 | if (ses == NULL) { | |
f96637be | 974 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
975 | return -EIO; |
976 | } | |
79a58d1f | 977 | if (ses->server == NULL) { |
f96637be | 978 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
979 | return -EIO; |
980 | } | |
981 | ||
79a58d1f | 982 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
983 | return -ENOENT; |
984 | ||
79a58d1f | 985 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
986 | to the same server. We may make this configurable later or |
987 | use ses->maxReq */ | |
1da177e4 | 988 | |
fb2036d8 | 989 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 990 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 991 | len); |
6d9c6d54 VL |
992 | return -EIO; |
993 | } | |
994 | ||
a891f0f8 | 995 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
996 | if (rc) |
997 | return rc; | |
998 | ||
79a58d1f | 999 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1000 | and avoid races inside tcp sendmsg code that could cause corruption |
1001 | of smb data */ | |
1002 | ||
72ca545b | 1003 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 1004 | |
7ee1af76 JA |
1005 | rc = allocate_mid(ses, in_buf, &midQ); |
1006 | if (rc) { | |
72ca545b | 1007 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1008 | /* Update # of requests on wire to server */ |
a891f0f8 | 1009 | add_credits(ses->server, 1, 0); |
7ee1af76 | 1010 | return rc; |
1da177e4 LT |
1011 | } |
1012 | ||
ad009ac9 | 1013 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
1014 | if (rc) { |
1015 | mutex_unlock(&ses->server->srv_mutex); | |
1016 | goto out; | |
1017 | } | |
1da177e4 | 1018 | |
7c9421e1 | 1019 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
1020 | |
1021 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 1022 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1023 | cifs_in_send_dec(ses->server); |
1024 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1025 | |
1026 | if (rc < 0) | |
1027 | ses->server->sequence_number -= 2; | |
1028 | ||
72ca545b | 1029 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1030 | |
79a58d1f | 1031 | if (rc < 0) |
7ee1af76 JA |
1032 | goto out; |
1033 | ||
a891f0f8 | 1034 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 1035 | goto out; |
1da177e4 | 1036 | |
0ade640e | 1037 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1038 | if (rc != 0) { |
fb2036d8 | 1039 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1040 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1041 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1042 | /* no longer considered to be "in-flight" */ |
1043 | midQ->callback = DeleteMidQEntry; | |
1044 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 1045 | add_credits(ses->server, 1, 0); |
1be912dd JL |
1046 | return rc; |
1047 | } | |
1048 | spin_unlock(&GlobalMid_Lock); | |
1049 | } | |
1da177e4 | 1050 | |
3c1105df | 1051 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1052 | if (rc != 0) { |
a891f0f8 | 1053 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
1054 | return rc; |
1055 | } | |
50c2f753 | 1056 | |
2c8f981d | 1057 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1058 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1059 | rc = -EIO; |
f96637be | 1060 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1061 | goto out; |
1da177e4 | 1062 | } |
7ee1af76 | 1063 | |
d4e4854f | 1064 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1065 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1066 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1067 | out: |
3c1bf7e4 | 1068 | cifs_delete_mid(midQ); |
a891f0f8 | 1069 | add_credits(ses->server, 1, 0); |
1da177e4 | 1070 | |
7ee1af76 JA |
1071 | return rc; |
1072 | } | |
1da177e4 | 1073 | |
7ee1af76 JA |
1074 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1075 | blocking lock to return. */ | |
1076 | ||
1077 | static int | |
96daf2b0 | 1078 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1079 | struct smb_hdr *in_buf, |
1080 | struct smb_hdr *out_buf) | |
1081 | { | |
1082 | int bytes_returned; | |
96daf2b0 | 1083 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1084 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1085 | ||
1086 | /* We just modify the current in_buf to change | |
1087 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1088 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1089 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1090 | ||
1091 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1092 | pSMB->Timeout = 0; | |
88257360 | 1093 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1094 | |
1095 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1096 | &bytes_returned, 0); |
7ee1af76 JA |
1097 | } |
1098 | ||
1099 | int | |
96daf2b0 | 1100 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1101 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1102 | int *pbytes_returned) | |
1103 | { | |
1104 | int rc = 0; | |
1105 | int rstart = 0; | |
7ee1af76 | 1106 | struct mid_q_entry *midQ; |
96daf2b0 | 1107 | struct cifs_ses *ses; |
fb2036d8 PS |
1108 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1109 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1110 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1111 | |
1112 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1113 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1114 | return -EIO; |
1115 | } | |
1116 | ses = tcon->ses; | |
1117 | ||
79a58d1f | 1118 | if (ses->server == NULL) { |
f96637be | 1119 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1120 | return -EIO; |
1121 | } | |
1122 | ||
79a58d1f | 1123 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1124 | return -ENOENT; |
1125 | ||
79a58d1f | 1126 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1127 | to the same server. We may make this configurable later or |
1128 | use ses->maxReq */ | |
1129 | ||
fb2036d8 | 1130 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1131 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1132 | len); |
6d9c6d54 VL |
1133 | return -EIO; |
1134 | } | |
1135 | ||
a891f0f8 | 1136 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1137 | if (rc) |
1138 | return rc; | |
1139 | ||
79a58d1f | 1140 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1141 | and avoid races inside tcp sendmsg code that could cause corruption |
1142 | of smb data */ | |
1143 | ||
72ca545b | 1144 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1145 | |
1146 | rc = allocate_mid(ses, in_buf, &midQ); | |
1147 | if (rc) { | |
72ca545b | 1148 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1149 | return rc; |
1150 | } | |
1151 | ||
7ee1af76 | 1152 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1153 | if (rc) { |
3c1bf7e4 | 1154 | cifs_delete_mid(midQ); |
829049cb VL |
1155 | mutex_unlock(&ses->server->srv_mutex); |
1156 | return rc; | |
1157 | } | |
1da177e4 | 1158 | |
7c9421e1 | 1159 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1160 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1161 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1162 | cifs_in_send_dec(ses->server); |
1163 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1164 | |
1165 | if (rc < 0) | |
1166 | ses->server->sequence_number -= 2; | |
1167 | ||
72ca545b | 1168 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1169 | |
79a58d1f | 1170 | if (rc < 0) { |
3c1bf7e4 | 1171 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1172 | return rc; |
1173 | } | |
1174 | ||
1175 | /* Wait for a reply - allow signals to interrupt. */ | |
1176 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1177 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1178 | ((ses->server->tcpStatus != CifsGood) && |
1179 | (ses->server->tcpStatus != CifsNew))); | |
1180 | ||
1181 | /* Were we interrupted by a signal ? */ | |
1182 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1183 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1184 | ((ses->server->tcpStatus == CifsGood) || |
1185 | (ses->server->tcpStatus == CifsNew))) { | |
1186 | ||
1187 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1188 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1189 | blocking lock to return. */ | |
fb2036d8 | 1190 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1191 | if (rc) { |
3c1bf7e4 | 1192 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1193 | return rc; |
1194 | } | |
1195 | } else { | |
1196 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1197 | to cause the blocking lock to return. */ | |
1198 | ||
1199 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1200 | ||
1201 | /* If we get -ENOLCK back the lock may have | |
1202 | already been removed. Don't exit in this case. */ | |
1203 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1204 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1205 | return rc; |
1206 | } | |
1207 | } | |
1208 | ||
1be912dd JL |
1209 | rc = wait_for_response(ses->server, midQ); |
1210 | if (rc) { | |
fb2036d8 | 1211 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1212 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1213 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1214 | /* no longer considered to be "in-flight" */ |
1215 | midQ->callback = DeleteMidQEntry; | |
1216 | spin_unlock(&GlobalMid_Lock); | |
1217 | return rc; | |
1218 | } | |
1219 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1220 | } |
1be912dd JL |
1221 | |
1222 | /* We got the response - restart system call. */ | |
1223 | rstart = 1; | |
7ee1af76 JA |
1224 | } |
1225 | ||
3c1105df | 1226 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1227 | if (rc != 0) |
7ee1af76 | 1228 | return rc; |
50c2f753 | 1229 | |
17c8bfed | 1230 | /* rcvd frame is ok */ |
7c9421e1 | 1231 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1232 | rc = -EIO; |
f96637be | 1233 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1234 | goto out; |
1235 | } | |
1da177e4 | 1236 | |
d4e4854f | 1237 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1238 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1239 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1240 | out: |
3c1bf7e4 | 1241 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1242 | if (rstart && rc == -EACCES) |
1243 | return -ERESTARTSYS; | |
1da177e4 LT |
1244 | return rc; |
1245 | } |