]>
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)) { | |
468d6779 SF |
120 | /* smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command */ |
121 | if ((le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) && | |
122 | (le16_to_cpu(midEntry->command) >= 0)) | |
123 | cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]); | |
124 | ||
020eec5f SF |
125 | trace_smb3_slow_rsp(le16_to_cpu(midEntry->command), |
126 | midEntry->mid, midEntry->pid, | |
127 | midEntry->when_sent, midEntry->when_received); | |
128 | if (cifsFYI & CIFS_TIMER) { | |
0b456f04 | 129 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 130 | midEntry->command, midEntry->mid); |
0b456f04 | 131 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
132 | now - midEntry->when_alloc, |
133 | now - midEntry->when_sent, | |
134 | now - midEntry->when_received); | |
135 | } | |
136 | } | |
137 | #endif | |
696e420b | 138 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
139 | } |
140 | ||
3c1bf7e4 PS |
141 | void |
142 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
143 | { |
144 | spin_lock(&GlobalMid_Lock); | |
ddf83afb RS |
145 | list_del_init(&mid->qhead); |
146 | mid->mid_flags |= MID_DELETED; | |
ddc8cf8f JL |
147 | spin_unlock(&GlobalMid_Lock); |
148 | ||
149 | DeleteMidQEntry(mid); | |
150 | } | |
151 | ||
6f49f46b JL |
152 | /* |
153 | * smb_send_kvec - send an array of kvecs to the server | |
154 | * @server: Server to send the data to | |
3ab3f2a1 | 155 | * @smb_msg: Message to send |
6f49f46b JL |
156 | * @sent: amount of data sent on socket is stored here |
157 | * | |
158 | * Our basic "send data to server" function. Should be called with srv_mutex | |
159 | * held. The caller is responsible for handling the results. | |
160 | */ | |
d6e04ae6 | 161 | static int |
3ab3f2a1 AV |
162 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
163 | size_t *sent) | |
1da177e4 LT |
164 | { |
165 | int rc = 0; | |
3ab3f2a1 | 166 | int retries = 0; |
edf1ae40 | 167 | struct socket *ssocket = server->ssocket; |
50c2f753 | 168 | |
6f49f46b JL |
169 | *sent = 0; |
170 | ||
3ab3f2a1 AV |
171 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
172 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
173 | smb_msg->msg_control = NULL; | |
174 | smb_msg->msg_controllen = 0; | |
0496e02d | 175 | if (server->noblocksnd) |
3ab3f2a1 | 176 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 177 | else |
3ab3f2a1 | 178 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 179 | |
3ab3f2a1 | 180 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
181 | /* |
182 | * If blocking send, we try 3 times, since each can block | |
183 | * for 5 seconds. For nonblocking we have to try more | |
184 | * but wait increasing amounts of time allowing time for | |
185 | * socket to clear. The overall time we wait in either | |
186 | * case to send on the socket is about 15 seconds. | |
187 | * Similarly we wait for 15 seconds for a response from | |
188 | * the server in SendReceive[2] for the server to send | |
189 | * a response back for most types of requests (except | |
190 | * SMB Write past end of file which can be slow, and | |
191 | * blocking lock operations). NFS waits slightly longer | |
192 | * than CIFS, but this can make it take longer for | |
193 | * nonresponsive servers to be detected and 15 seconds | |
194 | * is more than enough time for modern networks to | |
195 | * send a packet. In most cases if we fail to send | |
196 | * after the retries we will kill the socket and | |
197 | * reconnect which may clear the network problem. | |
198 | */ | |
3ab3f2a1 | 199 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 200 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
201 | retries++; |
202 | if (retries >= 14 || | |
203 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
204 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
205 | ssocket); | |
3ab3f2a1 | 206 | return -EAGAIN; |
1da177e4 | 207 | } |
3ab3f2a1 | 208 | msleep(1 << retries); |
1da177e4 LT |
209 | continue; |
210 | } | |
6f49f46b | 211 | |
79a58d1f | 212 | if (rc < 0) |
3ab3f2a1 | 213 | return rc; |
6f49f46b | 214 | |
79a58d1f | 215 | if (rc == 0) { |
3e84469d SF |
216 | /* should never happen, letting socket clear before |
217 | retrying is our only obvious option here */ | |
f96637be | 218 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
219 | msleep(500); |
220 | continue; | |
d6e04ae6 | 221 | } |
6f49f46b | 222 | |
3ab3f2a1 AV |
223 | /* send was at least partially successful */ |
224 | *sent += rc; | |
225 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 226 | } |
3ab3f2a1 | 227 | return 0; |
97bc00b3 JL |
228 | } |
229 | ||
35e2cc1b | 230 | unsigned long |
81f39f95 | 231 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
232 | { |
233 | unsigned int i; | |
35e2cc1b PA |
234 | struct kvec *iov; |
235 | int nvec; | |
a26054d1 JL |
236 | unsigned long buflen = 0; |
237 | ||
81f39f95 RS |
238 | if (server->vals->header_preamble_size == 0 && |
239 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
240 | iov = &rqst->rq_iov[1]; |
241 | nvec = rqst->rq_nvec - 1; | |
242 | } else { | |
243 | iov = rqst->rq_iov; | |
244 | nvec = rqst->rq_nvec; | |
245 | } | |
246 | ||
a26054d1 | 247 | /* total up iov array first */ |
35e2cc1b | 248 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
249 | buflen += iov[i].iov_len; |
250 | ||
c06a0f2d LL |
251 | /* |
252 | * Add in the page array if there is one. The caller needs to make | |
253 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
254 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
255 | * PAGE_SIZE. | |
256 | */ | |
a26054d1 | 257 | if (rqst->rq_npages) { |
c06a0f2d LL |
258 | if (rqst->rq_npages == 1) |
259 | buflen += rqst->rq_tailsz; | |
260 | else { | |
261 | /* | |
262 | * If there is more than one page, calculate the | |
263 | * buffer length based on rq_offset and rq_tailsz | |
264 | */ | |
265 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
266 | rqst->rq_offset; | |
267 | buflen += rqst->rq_tailsz; | |
268 | } | |
a26054d1 JL |
269 | } |
270 | ||
271 | return buflen; | |
272 | } | |
273 | ||
6f49f46b | 274 | static int |
07cd952f RS |
275 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
276 | struct smb_rqst *rqst) | |
6f49f46b | 277 | { |
07cd952f RS |
278 | int rc = 0; |
279 | struct kvec *iov; | |
280 | int n_vec; | |
281 | unsigned int send_length = 0; | |
282 | unsigned int i, j; | |
3ab3f2a1 | 283 | size_t total_len = 0, sent, size; |
b8eed283 | 284 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 285 | struct msghdr smb_msg; |
b8eed283 | 286 | int val = 1; |
c713c877 RS |
287 | __be32 rfc1002_marker; |
288 | ||
9762c2d0 | 289 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
81f39f95 | 290 | rc = smbd_send(server, rqst); |
9762c2d0 LL |
291 | goto smbd_done; |
292 | } | |
ea702b80 JL |
293 | if (ssocket == NULL) |
294 | return -ENOTSOCK; | |
295 | ||
b8eed283 JL |
296 | /* cork the socket */ |
297 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
298 | (char *)&val, sizeof(val)); | |
299 | ||
07cd952f | 300 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 301 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
302 | rfc1002_marker = cpu_to_be32(send_length); |
303 | ||
c713c877 RS |
304 | /* Generate a rfc1002 marker for SMB2+ */ |
305 | if (server->vals->header_preamble_size == 0) { | |
306 | struct kvec hiov = { | |
307 | .iov_base = &rfc1002_marker, | |
308 | .iov_len = 4 | |
309 | }; | |
310 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov, | |
311 | 1, 4); | |
312 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
313 | if (rc < 0) | |
314 | goto uncork; | |
315 | ||
316 | total_len += sent; | |
317 | send_length += 4; | |
318 | } | |
319 | ||
662bf5bc PA |
320 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
321 | ||
07cd952f RS |
322 | for (j = 0; j < num_rqst; j++) { |
323 | iov = rqst[j].rq_iov; | |
324 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 325 | |
07cd952f | 326 | size = 0; |
662bf5bc PA |
327 | for (i = 0; i < n_vec; i++) { |
328 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 329 | size += iov[i].iov_len; |
662bf5bc | 330 | } |
97bc00b3 | 331 | |
07cd952f RS |
332 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, |
333 | iov, n_vec, size); | |
97bc00b3 | 334 | |
3ab3f2a1 | 335 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 336 | if (rc < 0) |
07cd952f | 337 | goto uncork; |
97bc00b3 JL |
338 | |
339 | total_len += sent; | |
07cd952f RS |
340 | |
341 | /* now walk the page array and send each page in it */ | |
342 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
343 | struct bio_vec bvec; | |
344 | ||
345 | bvec.bv_page = rqst[j].rq_pages[i]; | |
346 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
347 | &bvec.bv_offset); | |
348 | ||
349 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, | |
350 | &bvec, 1, bvec.bv_len); | |
351 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
352 | if (rc < 0) | |
353 | break; | |
354 | ||
355 | total_len += sent; | |
356 | } | |
97bc00b3 | 357 | } |
1da177e4 | 358 | |
97bc00b3 | 359 | uncork: |
b8eed283 JL |
360 | /* uncork it */ |
361 | val = 0; | |
362 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
363 | (char *)&val, sizeof(val)); | |
364 | ||
c713c877 | 365 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 366 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 367 | send_length, total_len); |
6f49f46b JL |
368 | /* |
369 | * If we have only sent part of an SMB then the next SMB could | |
370 | * be taken as the remainder of this one. We need to kill the | |
371 | * socket so the server throws away the partial SMB | |
372 | */ | |
edf1ae40 | 373 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
374 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
375 | server->hostname); | |
edf1ae40 | 376 | } |
9762c2d0 | 377 | smbd_done: |
d804d41d | 378 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
379 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
380 | rc); | |
d804d41d | 381 | else |
1da177e4 | 382 | rc = 0; |
1da177e4 LT |
383 | |
384 | return rc; | |
385 | } | |
386 | ||
6f49f46b | 387 | static int |
1f3a8f5f RS |
388 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
389 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 390 | { |
b2c96de7 RS |
391 | struct kvec iov; |
392 | struct smb2_transform_hdr tr_hdr; | |
393 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
394 | int rc; |
395 | ||
396 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
397 | return __smb_send_rqst(server, num_rqst, rqst); |
398 | ||
399 | if (num_rqst > MAX_COMPOUND - 1) | |
400 | return -ENOMEM; | |
7fb8986e | 401 | |
b2c96de7 RS |
402 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
403 | memset(&iov, 0, sizeof(iov)); | |
404 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
405 | ||
406 | iov.iov_base = &tr_hdr; | |
407 | iov.iov_len = sizeof(tr_hdr); | |
408 | cur_rqst[0].rq_iov = &iov; | |
409 | cur_rqst[0].rq_nvec = 1; | |
410 | ||
411 | if (!server->ops->init_transform_rq) { | |
412 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
413 | "is missing\n"); | |
7fb8986e PS |
414 | return -EIO; |
415 | } | |
6f49f46b | 416 | |
1f3a8f5f RS |
417 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
418 | &cur_rqst[0], rqst); | |
7fb8986e PS |
419 | if (rc) |
420 | return rc; | |
421 | ||
1f3a8f5f RS |
422 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
423 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 424 | return rc; |
6f49f46b JL |
425 | } |
426 | ||
0496e02d JL |
427 | int |
428 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
429 | unsigned int smb_buf_length) | |
430 | { | |
738f9de5 | 431 | struct kvec iov[2]; |
7fb8986e PS |
432 | struct smb_rqst rqst = { .rq_iov = iov, |
433 | .rq_nvec = 2 }; | |
0496e02d | 434 | |
738f9de5 PS |
435 | iov[0].iov_base = smb_buffer; |
436 | iov[0].iov_len = 4; | |
437 | iov[1].iov_base = (char *)smb_buffer + 4; | |
438 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 439 | |
07cd952f | 440 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
441 | } |
442 | ||
fc40f9cf | 443 | static int |
a891f0f8 | 444 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 445 | int *credits) |
1da177e4 | 446 | { |
5bc59498 PS |
447 | int rc; |
448 | ||
fc40f9cf | 449 | spin_lock(&server->req_lock); |
a891f0f8 | 450 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 451 | /* oplock breaks must not be held up */ |
fc40f9cf | 452 | server->in_flight++; |
bc205ed1 | 453 | *credits -= 1; |
fc40f9cf | 454 | spin_unlock(&server->req_lock); |
27a97a61 VL |
455 | return 0; |
456 | } | |
457 | ||
27a97a61 | 458 | while (1) { |
bc205ed1 | 459 | if (*credits <= 0) { |
fc40f9cf | 460 | spin_unlock(&server->req_lock); |
789e6661 | 461 | cifs_num_waiters_inc(server); |
5bc59498 | 462 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 463 | has_credits(server, credits)); |
789e6661 | 464 | cifs_num_waiters_dec(server); |
5bc59498 PS |
465 | if (rc) |
466 | return rc; | |
fc40f9cf | 467 | spin_lock(&server->req_lock); |
27a97a61 | 468 | } else { |
c5797a94 | 469 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 470 | spin_unlock(&server->req_lock); |
27a97a61 | 471 | return -ENOENT; |
1da177e4 | 472 | } |
27a97a61 | 473 | |
2d86dbc9 PS |
474 | /* |
475 | * Can not count locking commands against total | |
476 | * as they are allowed to block on server. | |
477 | */ | |
27a97a61 VL |
478 | |
479 | /* update # of requests on the wire to server */ | |
a891f0f8 | 480 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 481 | *credits -= 1; |
fc40f9cf | 482 | server->in_flight++; |
2d86dbc9 | 483 | } |
fc40f9cf | 484 | spin_unlock(&server->req_lock); |
27a97a61 | 485 | break; |
1da177e4 LT |
486 | } |
487 | } | |
7ee1af76 JA |
488 | return 0; |
489 | } | |
1da177e4 | 490 | |
bc205ed1 | 491 | static int |
a891f0f8 PS |
492 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
493 | const int optype) | |
bc205ed1 | 494 | { |
eb4c7df6 SP |
495 | int *val; |
496 | ||
497 | val = server->ops->get_credits_field(server, optype); | |
498 | /* Since an echo is already inflight, no need to wait to send another */ | |
499 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
500 | return -EAGAIN; | |
501 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
502 | } |
503 | ||
cb7e9eab PS |
504 | int |
505 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
506 | unsigned int *num, unsigned int *credits) | |
507 | { | |
508 | *num = size; | |
509 | *credits = 0; | |
510 | return 0; | |
511 | } | |
512 | ||
96daf2b0 | 513 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
514 | struct mid_q_entry **ppmidQ) |
515 | { | |
1da177e4 | 516 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 517 | return -ENOENT; |
8fbbd365 VL |
518 | } |
519 | ||
520 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 521 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 522 | return -EAGAIN; |
8fbbd365 VL |
523 | } |
524 | ||
7f48558e | 525 | if (ses->status == CifsNew) { |
79a58d1f | 526 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 527 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 528 | return -EAGAIN; |
ad7a2926 | 529 | /* else ok - we are setting up session */ |
1da177e4 | 530 | } |
7f48558e SP |
531 | |
532 | if (ses->status == CifsExiting) { | |
533 | /* check if SMB session is bad because we are setting it up */ | |
534 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
535 | return -EAGAIN; | |
536 | /* else ok - we are shutting down session */ | |
537 | } | |
538 | ||
24b9b06b | 539 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 540 | if (*ppmidQ == NULL) |
7ee1af76 | 541 | return -ENOMEM; |
ddc8cf8f JL |
542 | spin_lock(&GlobalMid_Lock); |
543 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
544 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
545 | return 0; |
546 | } | |
547 | ||
0ade640e JL |
548 | static int |
549 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 550 | { |
0ade640e | 551 | int error; |
7ee1af76 | 552 | |
5853cc2a | 553 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 554 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
555 | if (error < 0) |
556 | return -ERESTARTSYS; | |
7ee1af76 | 557 | |
0ade640e | 558 | return 0; |
7ee1af76 JA |
559 | } |
560 | ||
fec344e3 JL |
561 | struct mid_q_entry * |
562 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
563 | { |
564 | int rc; | |
fec344e3 | 565 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
566 | struct mid_q_entry *mid; |
567 | ||
738f9de5 PS |
568 | if (rqst->rq_iov[0].iov_len != 4 || |
569 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
570 | return ERR_PTR(-EIO); | |
571 | ||
792af7b0 | 572 | /* enable signing if server requires it */ |
38d77c50 | 573 | if (server->sign) |
792af7b0 PS |
574 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
575 | ||
576 | mid = AllocMidQEntry(hdr, server); | |
577 | if (mid == NULL) | |
fec344e3 | 578 | return ERR_PTR(-ENOMEM); |
792af7b0 | 579 | |
fec344e3 | 580 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
581 | if (rc) { |
582 | DeleteMidQEntry(mid); | |
fec344e3 | 583 | return ERR_PTR(rc); |
ffc61ccb SP |
584 | } |
585 | ||
fec344e3 | 586 | return mid; |
792af7b0 | 587 | } |
133672ef | 588 | |
a6827c18 JL |
589 | /* |
590 | * Send a SMB request and set the callback function in the mid to handle | |
591 | * the result. Caller is responsible for dealing with timeouts. | |
592 | */ | |
593 | int | |
fec344e3 | 594 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
595 | mid_receive_t *receive, mid_callback_t *callback, |
596 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 597 | { |
a891f0f8 | 598 | int rc, timeout, optype; |
a6827c18 | 599 | struct mid_q_entry *mid; |
cb7e9eab | 600 | unsigned int credits = 0; |
a6827c18 | 601 | |
a891f0f8 PS |
602 | timeout = flags & CIFS_TIMEOUT_MASK; |
603 | optype = flags & CIFS_OP_MASK; | |
604 | ||
cb7e9eab PS |
605 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
606 | rc = wait_for_free_request(server, timeout, optype); | |
607 | if (rc) | |
608 | return rc; | |
609 | credits = 1; | |
610 | } | |
a6827c18 JL |
611 | |
612 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
613 | mid = server->ops->setup_async_request(server, rqst); |
614 | if (IS_ERR(mid)) { | |
a6827c18 | 615 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 616 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 617 | return PTR_ERR(mid); |
a6827c18 JL |
618 | } |
619 | ||
44d22d84 | 620 | mid->receive = receive; |
a6827c18 JL |
621 | mid->callback = callback; |
622 | mid->callback_data = cbdata; | |
9b7c18a2 | 623 | mid->handle = handle; |
7c9421e1 | 624 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 625 | |
ffc61ccb SP |
626 | /* put it on the pending_mid_q */ |
627 | spin_lock(&GlobalMid_Lock); | |
628 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
629 | spin_unlock(&GlobalMid_Lock); | |
630 | ||
93d2cb6c LL |
631 | /* |
632 | * Need to store the time in mid before calling I/O. For call_async, | |
633 | * I/O response may come back and free the mid entry on another thread. | |
634 | */ | |
635 | cifs_save_when_sent(mid); | |
789e6661 | 636 | cifs_in_send_inc(server); |
1f3a8f5f | 637 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 638 | cifs_in_send_dec(server); |
ad313cb8 | 639 | |
820962dc | 640 | if (rc < 0) { |
ad313cb8 | 641 | server->sequence_number -= 2; |
820962dc RV |
642 | cifs_delete_mid(mid); |
643 | } | |
644 | ||
a6827c18 | 645 | mutex_unlock(&server->srv_mutex); |
789e6661 | 646 | |
ffc61ccb SP |
647 | if (rc == 0) |
648 | return 0; | |
a6827c18 | 649 | |
cb7e9eab | 650 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
651 | return rc; |
652 | } | |
653 | ||
133672ef SF |
654 | /* |
655 | * | |
656 | * Send an SMB Request. No response info (other than return code) | |
657 | * needs to be parsed. | |
658 | * | |
659 | * flags indicate the type of request buffer and how long to wait | |
660 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
661 | * | |
662 | */ | |
663 | int | |
96daf2b0 | 664 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 665 | char *in_buf, int flags) |
133672ef SF |
666 | { |
667 | int rc; | |
668 | struct kvec iov[1]; | |
da502f7d | 669 | struct kvec rsp_iov; |
133672ef SF |
670 | int resp_buf_type; |
671 | ||
792af7b0 PS |
672 | iov[0].iov_base = in_buf; |
673 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 674 | flags |= CIFS_NO_RESP; |
da502f7d | 675 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 676 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 677 | |
133672ef SF |
678 | return rc; |
679 | } | |
680 | ||
053d5034 | 681 | static int |
3c1105df | 682 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
683 | { |
684 | int rc = 0; | |
685 | ||
f96637be JP |
686 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
687 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 688 | |
74dd92a8 | 689 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 690 | switch (mid->mid_state) { |
74dd92a8 | 691 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
692 | spin_unlock(&GlobalMid_Lock); |
693 | return rc; | |
74dd92a8 JL |
694 | case MID_RETRY_NEEDED: |
695 | rc = -EAGAIN; | |
696 | break; | |
71823baf JL |
697 | case MID_RESPONSE_MALFORMED: |
698 | rc = -EIO; | |
699 | break; | |
3c1105df JL |
700 | case MID_SHUTDOWN: |
701 | rc = -EHOSTDOWN; | |
702 | break; | |
74dd92a8 | 703 | default: |
3c1105df | 704 | list_del_init(&mid->qhead); |
f96637be JP |
705 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
706 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 707 | rc = -EIO; |
053d5034 JL |
708 | } |
709 | spin_unlock(&GlobalMid_Lock); | |
710 | ||
2b84a36c | 711 | DeleteMidQEntry(mid); |
053d5034 JL |
712 | return rc; |
713 | } | |
714 | ||
121b046a | 715 | static inline int |
fb2036d8 PS |
716 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
717 | struct mid_q_entry *mid) | |
76dcc26f | 718 | { |
121b046a | 719 | return server->ops->send_cancel ? |
fb2036d8 | 720 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
721 | } |
722 | ||
2c8f981d JL |
723 | int |
724 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
725 | bool log_error) | |
726 | { | |
792af7b0 | 727 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
728 | |
729 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
730 | |
731 | /* convert the length into a more usable form */ | |
38d77c50 | 732 | if (server->sign) { |
738f9de5 | 733 | struct kvec iov[2]; |
985e4ff0 | 734 | int rc = 0; |
738f9de5 PS |
735 | struct smb_rqst rqst = { .rq_iov = iov, |
736 | .rq_nvec = 2 }; | |
826a95e4 | 737 | |
738f9de5 PS |
738 | iov[0].iov_base = mid->resp_buf; |
739 | iov[0].iov_len = 4; | |
740 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
741 | iov[1].iov_len = len - 4; | |
2c8f981d | 742 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 743 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 744 | mid->sequence_number); |
985e4ff0 | 745 | if (rc) |
f96637be JP |
746 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
747 | rc); | |
2c8f981d JL |
748 | } |
749 | ||
750 | /* BB special case reconnect tid and uid here? */ | |
751 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
752 | } | |
753 | ||
fec344e3 JL |
754 | struct mid_q_entry * |
755 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
756 | { |
757 | int rc; | |
fec344e3 | 758 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
759 | struct mid_q_entry *mid; |
760 | ||
738f9de5 PS |
761 | if (rqst->rq_iov[0].iov_len != 4 || |
762 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
763 | return ERR_PTR(-EIO); | |
764 | ||
792af7b0 PS |
765 | rc = allocate_mid(ses, hdr, &mid); |
766 | if (rc) | |
fec344e3 JL |
767 | return ERR_PTR(rc); |
768 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
769 | if (rc) { | |
3c1bf7e4 | 770 | cifs_delete_mid(mid); |
fec344e3 JL |
771 | return ERR_PTR(rc); |
772 | } | |
773 | return mid; | |
792af7b0 PS |
774 | } |
775 | ||
b8f57ee8 | 776 | int |
e0bba0b8 RS |
777 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
778 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
779 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 780 | { |
e0bba0b8 | 781 | int i, j, rc = 0; |
a891f0f8 | 782 | int timeout, optype; |
e0bba0b8 | 783 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
a891f0f8 | 784 | unsigned int credits = 1; |
738f9de5 | 785 | char *buf; |
50c2f753 | 786 | |
a891f0f8 PS |
787 | timeout = flags & CIFS_TIMEOUT_MASK; |
788 | optype = flags & CIFS_OP_MASK; | |
133672ef | 789 | |
e0bba0b8 RS |
790 | for (i = 0; i < num_rqst; i++) |
791 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
792 | |
793 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 794 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
795 | return -EIO; |
796 | } | |
797 | ||
da502f7d | 798 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 799 | return -ENOENT; |
7ee1af76 | 800 | |
792af7b0 PS |
801 | /* |
802 | * Ensure that we do not send more than 50 overlapping requests | |
803 | * to the same server. We may make this configurable later or | |
804 | * use ses->maxReq. | |
805 | */ | |
a891f0f8 | 806 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 807 | if (rc) |
7ee1af76 | 808 | return rc; |
7ee1af76 | 809 | |
792af7b0 PS |
810 | /* |
811 | * Make sure that we sign in the same order that we send on this socket | |
812 | * and avoid races inside tcp sendmsg code that could cause corruption | |
813 | * of smb data. | |
814 | */ | |
7ee1af76 | 815 | |
72ca545b | 816 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 817 | |
e0bba0b8 RS |
818 | for (i = 0; i < num_rqst; i++) { |
819 | midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); | |
820 | if (IS_ERR(midQ[i])) { | |
821 | for (j = 0; j < i; j++) | |
822 | cifs_delete_mid(midQ[j]); | |
823 | mutex_unlock(&ses->server->srv_mutex); | |
824 | /* Update # of requests on wire to server */ | |
825 | add_credits(ses->server, 1, optype); | |
826 | return PTR_ERR(midQ[i]); | |
827 | } | |
828 | ||
829 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
1da177e4 | 830 | } |
1da177e4 | 831 | |
789e6661 | 832 | cifs_in_send_inc(ses->server); |
e0bba0b8 | 833 | rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); |
789e6661 | 834 | cifs_in_send_dec(ses->server); |
e0bba0b8 RS |
835 | |
836 | for (i = 0; i < num_rqst; i++) | |
837 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 838 | |
ad313cb8 JL |
839 | if (rc < 0) |
840 | ses->server->sequence_number -= 2; | |
e0bba0b8 | 841 | |
72ca545b | 842 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 843 | |
e0bba0b8 RS |
844 | for (i = 0; i < num_rqst; i++) { |
845 | if (rc < 0) | |
846 | goto out; | |
847 | ||
848 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
849 | smb311_update_preauth_hash(ses, rqst[i].rq_iov, | |
850 | rqst[i].rq_nvec); | |
851 | ||
852 | if (timeout == CIFS_ASYNC_OP) | |
853 | goto out; | |
854 | ||
855 | rc = wait_for_response(ses->server, midQ[i]); | |
856 | if (rc != 0) { | |
857 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", | |
858 | midQ[i]->mid); | |
859 | send_cancel(ses->server, &rqst[i], midQ[i]); | |
860 | spin_lock(&GlobalMid_Lock); | |
861 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
862 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
863 | midQ[i]->callback = DeleteMidQEntry; | |
864 | spin_unlock(&GlobalMid_Lock); | |
865 | add_credits(ses->server, 1, optype); | |
866 | return rc; | |
867 | } | |
1be912dd | 868 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 RS |
869 | } |
870 | ||
871 | rc = cifs_sync_mid_result(midQ[i], ses->server); | |
872 | if (rc != 0) { | |
a891f0f8 | 873 | add_credits(ses->server, 1, optype); |
1be912dd JL |
874 | return rc; |
875 | } | |
2b2bdfba | 876 | |
e0bba0b8 RS |
877 | if (!midQ[i]->resp_buf || |
878 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
879 | rc = -EIO; | |
880 | cifs_dbg(FYI, "Bad MID state?\n"); | |
881 | goto out; | |
882 | } | |
a891f0f8 | 883 | |
e0bba0b8 RS |
884 | buf = (char *)midQ[i]->resp_buf; |
885 | resp_iov[i].iov_base = buf; | |
886 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
887 | ses->server->vals->header_preamble_size; | |
888 | ||
889 | if (midQ[i]->large_buf) | |
890 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
891 | else | |
892 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
893 | ||
894 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
895 | struct kvec iov = { | |
896 | .iov_base = resp_iov[i].iov_base, | |
897 | .iov_len = resp_iov[i].iov_len | |
898 | }; | |
899 | smb311_update_preauth_hash(ses, &iov, 1); | |
900 | } | |
8bd68c6e | 901 | |
e0bba0b8 | 902 | credits = ses->server->ops->get_credits(midQ[i]); |
2b2bdfba | 903 | |
e0bba0b8 RS |
904 | rc = ses->server->ops->check_receive(midQ[i], ses->server, |
905 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 906 | |
e0bba0b8 RS |
907 | /* mark it so buf will not be freed by cifs_delete_mid */ |
908 | if ((flags & CIFS_NO_RESP) == 0) | |
909 | midQ[i]->resp_buf = NULL; | |
910 | } | |
7ee1af76 | 911 | out: |
e0bba0b8 RS |
912 | for (i = 0; i < num_rqst; i++) |
913 | cifs_delete_mid(midQ[i]); | |
a891f0f8 | 914 | add_credits(ses->server, credits, optype); |
1da177e4 | 915 | |
d6e04ae6 SF |
916 | return rc; |
917 | } | |
1da177e4 | 918 | |
e0bba0b8 RS |
919 | int |
920 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
921 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
922 | struct kvec *resp_iov) | |
923 | { | |
924 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
925 | resp_iov); | |
926 | } | |
927 | ||
738f9de5 PS |
928 | int |
929 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
930 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
931 | const int flags, struct kvec *resp_iov) | |
932 | { | |
933 | struct smb_rqst rqst; | |
3cecf486 | 934 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
935 | int rc; |
936 | ||
3cecf486 | 937 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
938 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
939 | GFP_KERNEL); | |
117e3b7f SF |
940 | if (!new_iov) { |
941 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
942 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 943 | return -ENOMEM; |
117e3b7f | 944 | } |
3cecf486 RS |
945 | } else |
946 | new_iov = s_iov; | |
738f9de5 PS |
947 | |
948 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
949 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
950 | ||
951 | new_iov[0].iov_base = new_iov[1].iov_base; | |
952 | new_iov[0].iov_len = 4; | |
953 | new_iov[1].iov_base += 4; | |
954 | new_iov[1].iov_len -= 4; | |
955 | ||
956 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
957 | rqst.rq_iov = new_iov; | |
958 | rqst.rq_nvec = n_vec + 1; | |
959 | ||
960 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
961 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
962 | kfree(new_iov); | |
738f9de5 PS |
963 | return rc; |
964 | } | |
965 | ||
1da177e4 | 966 | int |
96daf2b0 | 967 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 968 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 969 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
970 | { |
971 | int rc = 0; | |
1da177e4 | 972 | struct mid_q_entry *midQ; |
fb2036d8 PS |
973 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
974 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
975 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
976 | |
977 | if (ses == NULL) { | |
f96637be | 978 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
979 | return -EIO; |
980 | } | |
79a58d1f | 981 | if (ses->server == NULL) { |
f96637be | 982 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
983 | return -EIO; |
984 | } | |
985 | ||
79a58d1f | 986 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
987 | return -ENOENT; |
988 | ||
79a58d1f | 989 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
990 | to the same server. We may make this configurable later or |
991 | use ses->maxReq */ | |
1da177e4 | 992 | |
fb2036d8 | 993 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 994 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 995 | len); |
6d9c6d54 VL |
996 | return -EIO; |
997 | } | |
998 | ||
a891f0f8 | 999 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
1000 | if (rc) |
1001 | return rc; | |
1002 | ||
79a58d1f | 1003 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1004 | and avoid races inside tcp sendmsg code that could cause corruption |
1005 | of smb data */ | |
1006 | ||
72ca545b | 1007 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 1008 | |
7ee1af76 JA |
1009 | rc = allocate_mid(ses, in_buf, &midQ); |
1010 | if (rc) { | |
72ca545b | 1011 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1012 | /* Update # of requests on wire to server */ |
a891f0f8 | 1013 | add_credits(ses->server, 1, 0); |
7ee1af76 | 1014 | return rc; |
1da177e4 LT |
1015 | } |
1016 | ||
ad009ac9 | 1017 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
1018 | if (rc) { |
1019 | mutex_unlock(&ses->server->srv_mutex); | |
1020 | goto out; | |
1021 | } | |
1da177e4 | 1022 | |
7c9421e1 | 1023 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
1024 | |
1025 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 1026 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1027 | cifs_in_send_dec(ses->server); |
1028 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1029 | |
1030 | if (rc < 0) | |
1031 | ses->server->sequence_number -= 2; | |
1032 | ||
72ca545b | 1033 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1034 | |
79a58d1f | 1035 | if (rc < 0) |
7ee1af76 JA |
1036 | goto out; |
1037 | ||
a891f0f8 | 1038 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 1039 | goto out; |
1da177e4 | 1040 | |
0ade640e | 1041 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1042 | if (rc != 0) { |
fb2036d8 | 1043 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1044 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1045 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1046 | /* no longer considered to be "in-flight" */ |
1047 | midQ->callback = DeleteMidQEntry; | |
1048 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 1049 | add_credits(ses->server, 1, 0); |
1be912dd JL |
1050 | return rc; |
1051 | } | |
1052 | spin_unlock(&GlobalMid_Lock); | |
1053 | } | |
1da177e4 | 1054 | |
3c1105df | 1055 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1056 | if (rc != 0) { |
a891f0f8 | 1057 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
1058 | return rc; |
1059 | } | |
50c2f753 | 1060 | |
2c8f981d | 1061 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1062 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1063 | rc = -EIO; |
f96637be | 1064 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1065 | goto out; |
1da177e4 | 1066 | } |
7ee1af76 | 1067 | |
d4e4854f | 1068 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1069 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1070 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1071 | out: |
3c1bf7e4 | 1072 | cifs_delete_mid(midQ); |
a891f0f8 | 1073 | add_credits(ses->server, 1, 0); |
1da177e4 | 1074 | |
7ee1af76 JA |
1075 | return rc; |
1076 | } | |
1da177e4 | 1077 | |
7ee1af76 JA |
1078 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1079 | blocking lock to return. */ | |
1080 | ||
1081 | static int | |
96daf2b0 | 1082 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1083 | struct smb_hdr *in_buf, |
1084 | struct smb_hdr *out_buf) | |
1085 | { | |
1086 | int bytes_returned; | |
96daf2b0 | 1087 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1088 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1089 | ||
1090 | /* We just modify the current in_buf to change | |
1091 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1092 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1093 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1094 | ||
1095 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1096 | pSMB->Timeout = 0; | |
88257360 | 1097 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1098 | |
1099 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1100 | &bytes_returned, 0); |
7ee1af76 JA |
1101 | } |
1102 | ||
1103 | int | |
96daf2b0 | 1104 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1105 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1106 | int *pbytes_returned) | |
1107 | { | |
1108 | int rc = 0; | |
1109 | int rstart = 0; | |
7ee1af76 | 1110 | struct mid_q_entry *midQ; |
96daf2b0 | 1111 | struct cifs_ses *ses; |
fb2036d8 PS |
1112 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1113 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1114 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1115 | |
1116 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1117 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1118 | return -EIO; |
1119 | } | |
1120 | ses = tcon->ses; | |
1121 | ||
79a58d1f | 1122 | if (ses->server == NULL) { |
f96637be | 1123 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1124 | return -EIO; |
1125 | } | |
1126 | ||
79a58d1f | 1127 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1128 | return -ENOENT; |
1129 | ||
79a58d1f | 1130 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1131 | to the same server. We may make this configurable later or |
1132 | use ses->maxReq */ | |
1133 | ||
fb2036d8 | 1134 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1135 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1136 | len); |
6d9c6d54 VL |
1137 | return -EIO; |
1138 | } | |
1139 | ||
a891f0f8 | 1140 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1141 | if (rc) |
1142 | return rc; | |
1143 | ||
79a58d1f | 1144 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1145 | and avoid races inside tcp sendmsg code that could cause corruption |
1146 | of smb data */ | |
1147 | ||
72ca545b | 1148 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1149 | |
1150 | rc = allocate_mid(ses, in_buf, &midQ); | |
1151 | if (rc) { | |
72ca545b | 1152 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1153 | return rc; |
1154 | } | |
1155 | ||
7ee1af76 | 1156 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1157 | if (rc) { |
3c1bf7e4 | 1158 | cifs_delete_mid(midQ); |
829049cb VL |
1159 | mutex_unlock(&ses->server->srv_mutex); |
1160 | return rc; | |
1161 | } | |
1da177e4 | 1162 | |
7c9421e1 | 1163 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1164 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1165 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1166 | cifs_in_send_dec(ses->server); |
1167 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1168 | |
1169 | if (rc < 0) | |
1170 | ses->server->sequence_number -= 2; | |
1171 | ||
72ca545b | 1172 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1173 | |
79a58d1f | 1174 | if (rc < 0) { |
3c1bf7e4 | 1175 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1176 | return rc; |
1177 | } | |
1178 | ||
1179 | /* Wait for a reply - allow signals to interrupt. */ | |
1180 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1181 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1182 | ((ses->server->tcpStatus != CifsGood) && |
1183 | (ses->server->tcpStatus != CifsNew))); | |
1184 | ||
1185 | /* Were we interrupted by a signal ? */ | |
1186 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1187 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1188 | ((ses->server->tcpStatus == CifsGood) || |
1189 | (ses->server->tcpStatus == CifsNew))) { | |
1190 | ||
1191 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1192 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1193 | blocking lock to return. */ | |
fb2036d8 | 1194 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1195 | if (rc) { |
3c1bf7e4 | 1196 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1197 | return rc; |
1198 | } | |
1199 | } else { | |
1200 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1201 | to cause the blocking lock to return. */ | |
1202 | ||
1203 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1204 | ||
1205 | /* If we get -ENOLCK back the lock may have | |
1206 | already been removed. Don't exit in this case. */ | |
1207 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1208 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1209 | return rc; |
1210 | } | |
1211 | } | |
1212 | ||
1be912dd JL |
1213 | rc = wait_for_response(ses->server, midQ); |
1214 | if (rc) { | |
fb2036d8 | 1215 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1216 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1217 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1218 | /* no longer considered to be "in-flight" */ |
1219 | midQ->callback = DeleteMidQEntry; | |
1220 | spin_unlock(&GlobalMid_Lock); | |
1221 | return rc; | |
1222 | } | |
1223 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1224 | } |
1be912dd JL |
1225 | |
1226 | /* We got the response - restart system call. */ | |
1227 | rstart = 1; | |
7ee1af76 JA |
1228 | } |
1229 | ||
3c1105df | 1230 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1231 | if (rc != 0) |
7ee1af76 | 1232 | return rc; |
50c2f753 | 1233 | |
17c8bfed | 1234 | /* rcvd frame is ok */ |
7c9421e1 | 1235 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1236 | rc = -EIO; |
f96637be | 1237 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1238 | goto out; |
1239 | } | |
1da177e4 | 1240 | |
d4e4854f | 1241 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1242 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1243 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1244 | out: |
3c1bf7e4 | 1245 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1246 | if (rstart && rc == -EACCES) |
1247 | return -ERESTARTSYS; | |
1da177e4 LT |
1248 | return rc; |
1249 | } |