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; | |
00778e22 SF |
116 | /* |
117 | * commands taking longer than one second (default) can be indications | |
118 | * that something is wrong, unless it is quite a slow link or a very | |
119 | * busy server. Note that this calc is unlikely or impossible to wrap | |
120 | * as long as slow_rsp_threshold is not set way above recommended max | |
121 | * value (32767 ie 9 hours) and is generally harmless even if wrong | |
122 | * since only affects debug counters - so leaving the calc as simple | |
123 | * comparison rather than doing multiple conversions and overflow | |
124 | * checks | |
125 | */ | |
126 | if ((slow_rsp_threshold != 0) && | |
127 | time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && | |
020eec5f | 128 | (midEntry->command != command)) { |
468d6779 SF |
129 | /* smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command */ |
130 | if ((le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) && | |
131 | (le16_to_cpu(midEntry->command) >= 0)) | |
132 | cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]); | |
133 | ||
020eec5f SF |
134 | trace_smb3_slow_rsp(le16_to_cpu(midEntry->command), |
135 | midEntry->mid, midEntry->pid, | |
136 | midEntry->when_sent, midEntry->when_received); | |
137 | if (cifsFYI & CIFS_TIMER) { | |
0b456f04 | 138 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 139 | midEntry->command, midEntry->mid); |
0b456f04 | 140 | pr_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
141 | now - midEntry->when_alloc, |
142 | now - midEntry->when_sent, | |
143 | now - midEntry->when_received); | |
144 | } | |
145 | } | |
146 | #endif | |
696e420b | 147 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
148 | } |
149 | ||
3c1bf7e4 PS |
150 | void |
151 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
152 | { |
153 | spin_lock(&GlobalMid_Lock); | |
ddf83afb RS |
154 | list_del_init(&mid->qhead); |
155 | mid->mid_flags |= MID_DELETED; | |
ddc8cf8f JL |
156 | spin_unlock(&GlobalMid_Lock); |
157 | ||
158 | DeleteMidQEntry(mid); | |
159 | } | |
160 | ||
6f49f46b JL |
161 | /* |
162 | * smb_send_kvec - send an array of kvecs to the server | |
163 | * @server: Server to send the data to | |
3ab3f2a1 | 164 | * @smb_msg: Message to send |
6f49f46b JL |
165 | * @sent: amount of data sent on socket is stored here |
166 | * | |
167 | * Our basic "send data to server" function. Should be called with srv_mutex | |
168 | * held. The caller is responsible for handling the results. | |
169 | */ | |
d6e04ae6 | 170 | static int |
3ab3f2a1 AV |
171 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
172 | size_t *sent) | |
1da177e4 LT |
173 | { |
174 | int rc = 0; | |
3ab3f2a1 | 175 | int retries = 0; |
edf1ae40 | 176 | struct socket *ssocket = server->ssocket; |
50c2f753 | 177 | |
6f49f46b JL |
178 | *sent = 0; |
179 | ||
3ab3f2a1 AV |
180 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
181 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
182 | smb_msg->msg_control = NULL; | |
183 | smb_msg->msg_controllen = 0; | |
0496e02d | 184 | if (server->noblocksnd) |
3ab3f2a1 | 185 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 186 | else |
3ab3f2a1 | 187 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 188 | |
3ab3f2a1 | 189 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
190 | /* |
191 | * If blocking send, we try 3 times, since each can block | |
192 | * for 5 seconds. For nonblocking we have to try more | |
193 | * but wait increasing amounts of time allowing time for | |
194 | * socket to clear. The overall time we wait in either | |
195 | * case to send on the socket is about 15 seconds. | |
196 | * Similarly we wait for 15 seconds for a response from | |
197 | * the server in SendReceive[2] for the server to send | |
198 | * a response back for most types of requests (except | |
199 | * SMB Write past end of file which can be slow, and | |
200 | * blocking lock operations). NFS waits slightly longer | |
201 | * than CIFS, but this can make it take longer for | |
202 | * nonresponsive servers to be detected and 15 seconds | |
203 | * is more than enough time for modern networks to | |
204 | * send a packet. In most cases if we fail to send | |
205 | * after the retries we will kill the socket and | |
206 | * reconnect which may clear the network problem. | |
207 | */ | |
3ab3f2a1 | 208 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 209 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
210 | retries++; |
211 | if (retries >= 14 || | |
212 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
213 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
214 | ssocket); | |
3ab3f2a1 | 215 | return -EAGAIN; |
1da177e4 | 216 | } |
3ab3f2a1 | 217 | msleep(1 << retries); |
1da177e4 LT |
218 | continue; |
219 | } | |
6f49f46b | 220 | |
79a58d1f | 221 | if (rc < 0) |
3ab3f2a1 | 222 | return rc; |
6f49f46b | 223 | |
79a58d1f | 224 | if (rc == 0) { |
3e84469d SF |
225 | /* should never happen, letting socket clear before |
226 | retrying is our only obvious option here */ | |
f96637be | 227 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
228 | msleep(500); |
229 | continue; | |
d6e04ae6 | 230 | } |
6f49f46b | 231 | |
3ab3f2a1 AV |
232 | /* send was at least partially successful */ |
233 | *sent += rc; | |
234 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 235 | } |
3ab3f2a1 | 236 | return 0; |
97bc00b3 JL |
237 | } |
238 | ||
35e2cc1b | 239 | unsigned long |
81f39f95 | 240 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
241 | { |
242 | unsigned int i; | |
35e2cc1b PA |
243 | struct kvec *iov; |
244 | int nvec; | |
a26054d1 JL |
245 | unsigned long buflen = 0; |
246 | ||
81f39f95 RS |
247 | if (server->vals->header_preamble_size == 0 && |
248 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
249 | iov = &rqst->rq_iov[1]; |
250 | nvec = rqst->rq_nvec - 1; | |
251 | } else { | |
252 | iov = rqst->rq_iov; | |
253 | nvec = rqst->rq_nvec; | |
254 | } | |
255 | ||
a26054d1 | 256 | /* total up iov array first */ |
35e2cc1b | 257 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
258 | buflen += iov[i].iov_len; |
259 | ||
c06a0f2d LL |
260 | /* |
261 | * Add in the page array if there is one. The caller needs to make | |
262 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
263 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
264 | * PAGE_SIZE. | |
265 | */ | |
a26054d1 | 266 | if (rqst->rq_npages) { |
c06a0f2d LL |
267 | if (rqst->rq_npages == 1) |
268 | buflen += rqst->rq_tailsz; | |
269 | else { | |
270 | /* | |
271 | * If there is more than one page, calculate the | |
272 | * buffer length based on rq_offset and rq_tailsz | |
273 | */ | |
274 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
275 | rqst->rq_offset; | |
276 | buflen += rqst->rq_tailsz; | |
277 | } | |
a26054d1 JL |
278 | } |
279 | ||
280 | return buflen; | |
281 | } | |
282 | ||
6f49f46b | 283 | static int |
07cd952f RS |
284 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
285 | struct smb_rqst *rqst) | |
6f49f46b | 286 | { |
07cd952f RS |
287 | int rc = 0; |
288 | struct kvec *iov; | |
289 | int n_vec; | |
290 | unsigned int send_length = 0; | |
291 | unsigned int i, j; | |
3ab3f2a1 | 292 | size_t total_len = 0, sent, size; |
b8eed283 | 293 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 294 | struct msghdr smb_msg; |
b8eed283 | 295 | int val = 1; |
c713c877 RS |
296 | __be32 rfc1002_marker; |
297 | ||
9762c2d0 | 298 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
81f39f95 | 299 | rc = smbd_send(server, rqst); |
9762c2d0 LL |
300 | goto smbd_done; |
301 | } | |
ea702b80 JL |
302 | if (ssocket == NULL) |
303 | return -ENOTSOCK; | |
304 | ||
b8eed283 JL |
305 | /* cork the socket */ |
306 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
307 | (char *)&val, sizeof(val)); | |
308 | ||
07cd952f | 309 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 310 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
311 | rfc1002_marker = cpu_to_be32(send_length); |
312 | ||
c713c877 RS |
313 | /* Generate a rfc1002 marker for SMB2+ */ |
314 | if (server->vals->header_preamble_size == 0) { | |
315 | struct kvec hiov = { | |
316 | .iov_base = &rfc1002_marker, | |
317 | .iov_len = 4 | |
318 | }; | |
319 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, &hiov, | |
320 | 1, 4); | |
321 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
322 | if (rc < 0) | |
323 | goto uncork; | |
324 | ||
325 | total_len += sent; | |
326 | send_length += 4; | |
327 | } | |
328 | ||
662bf5bc PA |
329 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
330 | ||
07cd952f RS |
331 | for (j = 0; j < num_rqst; j++) { |
332 | iov = rqst[j].rq_iov; | |
333 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 334 | |
07cd952f | 335 | size = 0; |
662bf5bc PA |
336 | for (i = 0; i < n_vec; i++) { |
337 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 338 | size += iov[i].iov_len; |
662bf5bc | 339 | } |
97bc00b3 | 340 | |
07cd952f RS |
341 | iov_iter_kvec(&smb_msg.msg_iter, WRITE | ITER_KVEC, |
342 | iov, n_vec, size); | |
97bc00b3 | 343 | |
3ab3f2a1 | 344 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 345 | if (rc < 0) |
07cd952f | 346 | goto uncork; |
97bc00b3 JL |
347 | |
348 | total_len += sent; | |
07cd952f RS |
349 | |
350 | /* now walk the page array and send each page in it */ | |
351 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
352 | struct bio_vec bvec; | |
353 | ||
354 | bvec.bv_page = rqst[j].rq_pages[i]; | |
355 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
356 | &bvec.bv_offset); | |
357 | ||
358 | iov_iter_bvec(&smb_msg.msg_iter, WRITE | ITER_BVEC, | |
359 | &bvec, 1, bvec.bv_len); | |
360 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
361 | if (rc < 0) | |
362 | break; | |
363 | ||
364 | total_len += sent; | |
365 | } | |
97bc00b3 | 366 | } |
1da177e4 | 367 | |
97bc00b3 | 368 | uncork: |
b8eed283 JL |
369 | /* uncork it */ |
370 | val = 0; | |
371 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
372 | (char *)&val, sizeof(val)); | |
373 | ||
c713c877 | 374 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 375 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 376 | send_length, total_len); |
6f49f46b JL |
377 | /* |
378 | * If we have only sent part of an SMB then the next SMB could | |
379 | * be taken as the remainder of this one. We need to kill the | |
380 | * socket so the server throws away the partial SMB | |
381 | */ | |
edf1ae40 | 382 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
383 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
384 | server->hostname); | |
edf1ae40 | 385 | } |
9762c2d0 | 386 | smbd_done: |
d804d41d | 387 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
388 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
389 | rc); | |
d804d41d | 390 | else |
1da177e4 | 391 | rc = 0; |
1da177e4 LT |
392 | |
393 | return rc; | |
394 | } | |
395 | ||
6f49f46b | 396 | static int |
1f3a8f5f RS |
397 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
398 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 399 | { |
b2c96de7 RS |
400 | struct kvec iov; |
401 | struct smb2_transform_hdr tr_hdr; | |
402 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
403 | int rc; |
404 | ||
405 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
406 | return __smb_send_rqst(server, num_rqst, rqst); |
407 | ||
408 | if (num_rqst > MAX_COMPOUND - 1) | |
409 | return -ENOMEM; | |
7fb8986e | 410 | |
b2c96de7 RS |
411 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
412 | memset(&iov, 0, sizeof(iov)); | |
413 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
414 | ||
415 | iov.iov_base = &tr_hdr; | |
416 | iov.iov_len = sizeof(tr_hdr); | |
417 | cur_rqst[0].rq_iov = &iov; | |
418 | cur_rqst[0].rq_nvec = 1; | |
419 | ||
420 | if (!server->ops->init_transform_rq) { | |
421 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
422 | "is missing\n"); | |
7fb8986e PS |
423 | return -EIO; |
424 | } | |
6f49f46b | 425 | |
1f3a8f5f RS |
426 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
427 | &cur_rqst[0], rqst); | |
7fb8986e PS |
428 | if (rc) |
429 | return rc; | |
430 | ||
1f3a8f5f RS |
431 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
432 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 433 | return rc; |
6f49f46b JL |
434 | } |
435 | ||
0496e02d JL |
436 | int |
437 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
438 | unsigned int smb_buf_length) | |
439 | { | |
738f9de5 | 440 | struct kvec iov[2]; |
7fb8986e PS |
441 | struct smb_rqst rqst = { .rq_iov = iov, |
442 | .rq_nvec = 2 }; | |
0496e02d | 443 | |
738f9de5 PS |
444 | iov[0].iov_base = smb_buffer; |
445 | iov[0].iov_len = 4; | |
446 | iov[1].iov_base = (char *)smb_buffer + 4; | |
447 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 448 | |
07cd952f | 449 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
450 | } |
451 | ||
fc40f9cf | 452 | static int |
a891f0f8 | 453 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 454 | int *credits) |
1da177e4 | 455 | { |
5bc59498 PS |
456 | int rc; |
457 | ||
fc40f9cf | 458 | spin_lock(&server->req_lock); |
a891f0f8 | 459 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 460 | /* oplock breaks must not be held up */ |
fc40f9cf | 461 | server->in_flight++; |
bc205ed1 | 462 | *credits -= 1; |
fc40f9cf | 463 | spin_unlock(&server->req_lock); |
27a97a61 VL |
464 | return 0; |
465 | } | |
466 | ||
27a97a61 | 467 | while (1) { |
bc205ed1 | 468 | if (*credits <= 0) { |
fc40f9cf | 469 | spin_unlock(&server->req_lock); |
789e6661 | 470 | cifs_num_waiters_inc(server); |
5bc59498 | 471 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 472 | has_credits(server, credits)); |
789e6661 | 473 | cifs_num_waiters_dec(server); |
5bc59498 PS |
474 | if (rc) |
475 | return rc; | |
fc40f9cf | 476 | spin_lock(&server->req_lock); |
27a97a61 | 477 | } else { |
c5797a94 | 478 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 479 | spin_unlock(&server->req_lock); |
27a97a61 | 480 | return -ENOENT; |
1da177e4 | 481 | } |
27a97a61 | 482 | |
2d86dbc9 PS |
483 | /* |
484 | * Can not count locking commands against total | |
485 | * as they are allowed to block on server. | |
486 | */ | |
27a97a61 VL |
487 | |
488 | /* update # of requests on the wire to server */ | |
a891f0f8 | 489 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 490 | *credits -= 1; |
fc40f9cf | 491 | server->in_flight++; |
2d86dbc9 | 492 | } |
fc40f9cf | 493 | spin_unlock(&server->req_lock); |
27a97a61 | 494 | break; |
1da177e4 LT |
495 | } |
496 | } | |
7ee1af76 JA |
497 | return 0; |
498 | } | |
1da177e4 | 499 | |
bc205ed1 | 500 | static int |
a891f0f8 PS |
501 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
502 | const int optype) | |
bc205ed1 | 503 | { |
eb4c7df6 SP |
504 | int *val; |
505 | ||
506 | val = server->ops->get_credits_field(server, optype); | |
507 | /* Since an echo is already inflight, no need to wait to send another */ | |
508 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
509 | return -EAGAIN; | |
510 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
511 | } |
512 | ||
cb7e9eab PS |
513 | int |
514 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
515 | unsigned int *num, unsigned int *credits) | |
516 | { | |
517 | *num = size; | |
518 | *credits = 0; | |
519 | return 0; | |
520 | } | |
521 | ||
96daf2b0 | 522 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
523 | struct mid_q_entry **ppmidQ) |
524 | { | |
1da177e4 | 525 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 526 | return -ENOENT; |
8fbbd365 VL |
527 | } |
528 | ||
529 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 530 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 531 | return -EAGAIN; |
8fbbd365 VL |
532 | } |
533 | ||
7f48558e | 534 | if (ses->status == CifsNew) { |
79a58d1f | 535 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 536 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 537 | return -EAGAIN; |
ad7a2926 | 538 | /* else ok - we are setting up session */ |
1da177e4 | 539 | } |
7f48558e SP |
540 | |
541 | if (ses->status == CifsExiting) { | |
542 | /* check if SMB session is bad because we are setting it up */ | |
543 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
544 | return -EAGAIN; | |
545 | /* else ok - we are shutting down session */ | |
546 | } | |
547 | ||
24b9b06b | 548 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 549 | if (*ppmidQ == NULL) |
7ee1af76 | 550 | return -ENOMEM; |
ddc8cf8f JL |
551 | spin_lock(&GlobalMid_Lock); |
552 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
553 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
554 | return 0; |
555 | } | |
556 | ||
0ade640e JL |
557 | static int |
558 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 559 | { |
0ade640e | 560 | int error; |
7ee1af76 | 561 | |
5853cc2a | 562 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 563 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
564 | if (error < 0) |
565 | return -ERESTARTSYS; | |
7ee1af76 | 566 | |
0ade640e | 567 | return 0; |
7ee1af76 JA |
568 | } |
569 | ||
fec344e3 JL |
570 | struct mid_q_entry * |
571 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
572 | { |
573 | int rc; | |
fec344e3 | 574 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
575 | struct mid_q_entry *mid; |
576 | ||
738f9de5 PS |
577 | if (rqst->rq_iov[0].iov_len != 4 || |
578 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
579 | return ERR_PTR(-EIO); | |
580 | ||
792af7b0 | 581 | /* enable signing if server requires it */ |
38d77c50 | 582 | if (server->sign) |
792af7b0 PS |
583 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
584 | ||
585 | mid = AllocMidQEntry(hdr, server); | |
586 | if (mid == NULL) | |
fec344e3 | 587 | return ERR_PTR(-ENOMEM); |
792af7b0 | 588 | |
fec344e3 | 589 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
590 | if (rc) { |
591 | DeleteMidQEntry(mid); | |
fec344e3 | 592 | return ERR_PTR(rc); |
ffc61ccb SP |
593 | } |
594 | ||
fec344e3 | 595 | return mid; |
792af7b0 | 596 | } |
133672ef | 597 | |
a6827c18 JL |
598 | /* |
599 | * Send a SMB request and set the callback function in the mid to handle | |
600 | * the result. Caller is responsible for dealing with timeouts. | |
601 | */ | |
602 | int | |
fec344e3 | 603 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
604 | mid_receive_t *receive, mid_callback_t *callback, |
605 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 606 | { |
a891f0f8 | 607 | int rc, timeout, optype; |
a6827c18 | 608 | struct mid_q_entry *mid; |
cb7e9eab | 609 | unsigned int credits = 0; |
a6827c18 | 610 | |
a891f0f8 PS |
611 | timeout = flags & CIFS_TIMEOUT_MASK; |
612 | optype = flags & CIFS_OP_MASK; | |
613 | ||
cb7e9eab PS |
614 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
615 | rc = wait_for_free_request(server, timeout, optype); | |
616 | if (rc) | |
617 | return rc; | |
618 | credits = 1; | |
619 | } | |
a6827c18 JL |
620 | |
621 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
622 | mid = server->ops->setup_async_request(server, rqst); |
623 | if (IS_ERR(mid)) { | |
a6827c18 | 624 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 625 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 626 | return PTR_ERR(mid); |
a6827c18 JL |
627 | } |
628 | ||
44d22d84 | 629 | mid->receive = receive; |
a6827c18 JL |
630 | mid->callback = callback; |
631 | mid->callback_data = cbdata; | |
9b7c18a2 | 632 | mid->handle = handle; |
7c9421e1 | 633 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 634 | |
ffc61ccb SP |
635 | /* put it on the pending_mid_q */ |
636 | spin_lock(&GlobalMid_Lock); | |
637 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
638 | spin_unlock(&GlobalMid_Lock); | |
639 | ||
93d2cb6c LL |
640 | /* |
641 | * Need to store the time in mid before calling I/O. For call_async, | |
642 | * I/O response may come back and free the mid entry on another thread. | |
643 | */ | |
644 | cifs_save_when_sent(mid); | |
789e6661 | 645 | cifs_in_send_inc(server); |
1f3a8f5f | 646 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 647 | cifs_in_send_dec(server); |
ad313cb8 | 648 | |
820962dc | 649 | if (rc < 0) { |
ad313cb8 | 650 | server->sequence_number -= 2; |
820962dc RV |
651 | cifs_delete_mid(mid); |
652 | } | |
653 | ||
a6827c18 | 654 | mutex_unlock(&server->srv_mutex); |
789e6661 | 655 | |
ffc61ccb SP |
656 | if (rc == 0) |
657 | return 0; | |
a6827c18 | 658 | |
cb7e9eab | 659 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
660 | return rc; |
661 | } | |
662 | ||
133672ef SF |
663 | /* |
664 | * | |
665 | * Send an SMB Request. No response info (other than return code) | |
666 | * needs to be parsed. | |
667 | * | |
668 | * flags indicate the type of request buffer and how long to wait | |
669 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
670 | * | |
671 | */ | |
672 | int | |
96daf2b0 | 673 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 674 | char *in_buf, int flags) |
133672ef SF |
675 | { |
676 | int rc; | |
677 | struct kvec iov[1]; | |
da502f7d | 678 | struct kvec rsp_iov; |
133672ef SF |
679 | int resp_buf_type; |
680 | ||
792af7b0 PS |
681 | iov[0].iov_base = in_buf; |
682 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 683 | flags |= CIFS_NO_RESP; |
da502f7d | 684 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 685 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 686 | |
133672ef SF |
687 | return rc; |
688 | } | |
689 | ||
053d5034 | 690 | static int |
3c1105df | 691 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
692 | { |
693 | int rc = 0; | |
694 | ||
f96637be JP |
695 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
696 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 697 | |
74dd92a8 | 698 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 699 | switch (mid->mid_state) { |
74dd92a8 | 700 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
701 | spin_unlock(&GlobalMid_Lock); |
702 | return rc; | |
74dd92a8 JL |
703 | case MID_RETRY_NEEDED: |
704 | rc = -EAGAIN; | |
705 | break; | |
71823baf JL |
706 | case MID_RESPONSE_MALFORMED: |
707 | rc = -EIO; | |
708 | break; | |
3c1105df JL |
709 | case MID_SHUTDOWN: |
710 | rc = -EHOSTDOWN; | |
711 | break; | |
74dd92a8 | 712 | default: |
3c1105df | 713 | list_del_init(&mid->qhead); |
f96637be JP |
714 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
715 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 716 | rc = -EIO; |
053d5034 JL |
717 | } |
718 | spin_unlock(&GlobalMid_Lock); | |
719 | ||
2b84a36c | 720 | DeleteMidQEntry(mid); |
053d5034 JL |
721 | return rc; |
722 | } | |
723 | ||
121b046a | 724 | static inline int |
fb2036d8 PS |
725 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
726 | struct mid_q_entry *mid) | |
76dcc26f | 727 | { |
121b046a | 728 | return server->ops->send_cancel ? |
fb2036d8 | 729 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
730 | } |
731 | ||
2c8f981d JL |
732 | int |
733 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
734 | bool log_error) | |
735 | { | |
792af7b0 | 736 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
737 | |
738 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
739 | |
740 | /* convert the length into a more usable form */ | |
38d77c50 | 741 | if (server->sign) { |
738f9de5 | 742 | struct kvec iov[2]; |
985e4ff0 | 743 | int rc = 0; |
738f9de5 PS |
744 | struct smb_rqst rqst = { .rq_iov = iov, |
745 | .rq_nvec = 2 }; | |
826a95e4 | 746 | |
738f9de5 PS |
747 | iov[0].iov_base = mid->resp_buf; |
748 | iov[0].iov_len = 4; | |
749 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
750 | iov[1].iov_len = len - 4; | |
2c8f981d | 751 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 752 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 753 | mid->sequence_number); |
985e4ff0 | 754 | if (rc) |
f96637be JP |
755 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
756 | rc); | |
2c8f981d JL |
757 | } |
758 | ||
759 | /* BB special case reconnect tid and uid here? */ | |
760 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
761 | } | |
762 | ||
fec344e3 JL |
763 | struct mid_q_entry * |
764 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
765 | { |
766 | int rc; | |
fec344e3 | 767 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
768 | struct mid_q_entry *mid; |
769 | ||
738f9de5 PS |
770 | if (rqst->rq_iov[0].iov_len != 4 || |
771 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
772 | return ERR_PTR(-EIO); | |
773 | ||
792af7b0 PS |
774 | rc = allocate_mid(ses, hdr, &mid); |
775 | if (rc) | |
fec344e3 JL |
776 | return ERR_PTR(rc); |
777 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
778 | if (rc) { | |
3c1bf7e4 | 779 | cifs_delete_mid(mid); |
fec344e3 JL |
780 | return ERR_PTR(rc); |
781 | } | |
782 | return mid; | |
792af7b0 PS |
783 | } |
784 | ||
4e34feb5 RS |
785 | static void |
786 | cifs_noop_callback(struct mid_q_entry *mid) | |
787 | { | |
788 | } | |
789 | ||
b8f57ee8 | 790 | int |
e0bba0b8 RS |
791 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
792 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
793 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 794 | { |
e0bba0b8 | 795 | int i, j, rc = 0; |
a891f0f8 | 796 | int timeout, optype; |
e0bba0b8 | 797 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
cb5c2e63 | 798 | unsigned int credits = 0; |
738f9de5 | 799 | char *buf; |
50c2f753 | 800 | |
a891f0f8 PS |
801 | timeout = flags & CIFS_TIMEOUT_MASK; |
802 | optype = flags & CIFS_OP_MASK; | |
133672ef | 803 | |
e0bba0b8 RS |
804 | for (i = 0; i < num_rqst; i++) |
805 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
806 | |
807 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 808 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
809 | return -EIO; |
810 | } | |
811 | ||
da502f7d | 812 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 813 | return -ENOENT; |
7ee1af76 | 814 | |
792af7b0 PS |
815 | /* |
816 | * Ensure that we do not send more than 50 overlapping requests | |
817 | * to the same server. We may make this configurable later or | |
818 | * use ses->maxReq. | |
819 | */ | |
a891f0f8 | 820 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 821 | if (rc) |
7ee1af76 | 822 | return rc; |
7ee1af76 | 823 | |
792af7b0 PS |
824 | /* |
825 | * Make sure that we sign in the same order that we send on this socket | |
826 | * and avoid races inside tcp sendmsg code that could cause corruption | |
827 | * of smb data. | |
828 | */ | |
7ee1af76 | 829 | |
72ca545b | 830 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 831 | |
e0bba0b8 RS |
832 | for (i = 0; i < num_rqst; i++) { |
833 | midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); | |
834 | if (IS_ERR(midQ[i])) { | |
835 | for (j = 0; j < i; j++) | |
836 | cifs_delete_mid(midQ[j]); | |
837 | mutex_unlock(&ses->server->srv_mutex); | |
838 | /* Update # of requests on wire to server */ | |
839 | add_credits(ses->server, 1, optype); | |
840 | return PTR_ERR(midQ[i]); | |
841 | } | |
842 | ||
843 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
4e34feb5 RS |
844 | /* |
845 | * We don't invoke the callback compounds unless it is the last | |
846 | * request. | |
847 | */ | |
848 | if (i < num_rqst - 1) | |
849 | midQ[i]->callback = cifs_noop_callback; | |
1da177e4 | 850 | } |
789e6661 | 851 | cifs_in_send_inc(ses->server); |
e0bba0b8 | 852 | rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); |
789e6661 | 853 | cifs_in_send_dec(ses->server); |
e0bba0b8 RS |
854 | |
855 | for (i = 0; i < num_rqst; i++) | |
856 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 857 | |
ad313cb8 JL |
858 | if (rc < 0) |
859 | ses->server->sequence_number -= 2; | |
e0bba0b8 | 860 | |
72ca545b | 861 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 862 | |
cb5c2e63 RS |
863 | if (rc < 0) |
864 | goto out; | |
e0bba0b8 | 865 | |
cb5c2e63 RS |
866 | /* |
867 | * Compounding is never used during session establish. | |
868 | */ | |
869 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
870 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, | |
871 | rqst[0].rq_nvec); | |
e0bba0b8 | 872 | |
cb5c2e63 RS |
873 | if (timeout == CIFS_ASYNC_OP) |
874 | goto out; | |
e0bba0b8 | 875 | |
cb5c2e63 | 876 | for (i = 0; i < num_rqst; i++) { |
e0bba0b8 RS |
877 | rc = wait_for_response(ses->server, midQ[i]); |
878 | if (rc != 0) { | |
879 | cifs_dbg(FYI, "Cancelling wait for mid %llu\n", | |
880 | midQ[i]->mid); | |
881 | send_cancel(ses->server, &rqst[i], midQ[i]); | |
882 | spin_lock(&GlobalMid_Lock); | |
883 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
884 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
885 | midQ[i]->callback = DeleteMidQEntry; | |
886 | spin_unlock(&GlobalMid_Lock); | |
887 | add_credits(ses->server, 1, optype); | |
888 | return rc; | |
889 | } | |
1be912dd | 890 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 891 | } |
cb5c2e63 RS |
892 | } |
893 | ||
894 | for (i = 0; i < num_rqst; i++) | |
895 | if (midQ[i]->resp_buf) | |
896 | credits += ses->server->ops->get_credits(midQ[i]); | |
897 | if (!credits) | |
898 | credits = 1; | |
899 | ||
900 | for (i = 0; i < num_rqst; i++) { | |
901 | if (rc < 0) | |
902 | goto out; | |
e0bba0b8 RS |
903 | |
904 | rc = cifs_sync_mid_result(midQ[i], ses->server); | |
905 | if (rc != 0) { | |
cb5c2e63 | 906 | add_credits(ses->server, credits, optype); |
1be912dd JL |
907 | return rc; |
908 | } | |
2b2bdfba | 909 | |
e0bba0b8 RS |
910 | if (!midQ[i]->resp_buf || |
911 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
912 | rc = -EIO; | |
913 | cifs_dbg(FYI, "Bad MID state?\n"); | |
914 | goto out; | |
915 | } | |
a891f0f8 | 916 | |
e0bba0b8 RS |
917 | buf = (char *)midQ[i]->resp_buf; |
918 | resp_iov[i].iov_base = buf; | |
919 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
920 | ses->server->vals->header_preamble_size; | |
921 | ||
922 | if (midQ[i]->large_buf) | |
923 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
924 | else | |
925 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
926 | ||
e0bba0b8 RS |
927 | rc = ses->server->ops->check_receive(midQ[i], ses->server, |
928 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 929 | |
e0bba0b8 RS |
930 | /* mark it so buf will not be freed by cifs_delete_mid */ |
931 | if ((flags & CIFS_NO_RESP) == 0) | |
932 | midQ[i]->resp_buf = NULL; | |
cb5c2e63 | 933 | |
e0bba0b8 | 934 | } |
cb5c2e63 RS |
935 | |
936 | /* | |
937 | * Compounding is never used during session establish. | |
938 | */ | |
939 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
940 | struct kvec iov = { | |
941 | .iov_base = resp_iov[0].iov_base, | |
942 | .iov_len = resp_iov[0].iov_len | |
943 | }; | |
944 | smb311_update_preauth_hash(ses, &iov, 1); | |
945 | } | |
946 | ||
7ee1af76 | 947 | out: |
4e34feb5 RS |
948 | /* |
949 | * This will dequeue all mids. After this it is important that the | |
950 | * demultiplex_thread will not process any of these mids any futher. | |
951 | * This is prevented above by using a noop callback that will not | |
952 | * wake this thread except for the very last PDU. | |
953 | */ | |
e0bba0b8 RS |
954 | for (i = 0; i < num_rqst; i++) |
955 | cifs_delete_mid(midQ[i]); | |
a891f0f8 | 956 | add_credits(ses->server, credits, optype); |
1da177e4 | 957 | |
d6e04ae6 SF |
958 | return rc; |
959 | } | |
1da177e4 | 960 | |
e0bba0b8 RS |
961 | int |
962 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
963 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
964 | struct kvec *resp_iov) | |
965 | { | |
966 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
967 | resp_iov); | |
968 | } | |
969 | ||
738f9de5 PS |
970 | int |
971 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
972 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
973 | const int flags, struct kvec *resp_iov) | |
974 | { | |
975 | struct smb_rqst rqst; | |
3cecf486 | 976 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
977 | int rc; |
978 | ||
3cecf486 | 979 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
980 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
981 | GFP_KERNEL); | |
117e3b7f SF |
982 | if (!new_iov) { |
983 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
984 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 985 | return -ENOMEM; |
117e3b7f | 986 | } |
3cecf486 RS |
987 | } else |
988 | new_iov = s_iov; | |
738f9de5 PS |
989 | |
990 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
991 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
992 | ||
993 | new_iov[0].iov_base = new_iov[1].iov_base; | |
994 | new_iov[0].iov_len = 4; | |
995 | new_iov[1].iov_base += 4; | |
996 | new_iov[1].iov_len -= 4; | |
997 | ||
998 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
999 | rqst.rq_iov = new_iov; | |
1000 | rqst.rq_nvec = n_vec + 1; | |
1001 | ||
1002 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1003 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1004 | kfree(new_iov); | |
738f9de5 PS |
1005 | return rc; |
1006 | } | |
1007 | ||
1da177e4 | 1008 | int |
96daf2b0 | 1009 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1010 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 1011 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
1012 | { |
1013 | int rc = 0; | |
1da177e4 | 1014 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1015 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1016 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1017 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
1018 | |
1019 | if (ses == NULL) { | |
f96637be | 1020 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1021 | return -EIO; |
1022 | } | |
79a58d1f | 1023 | if (ses->server == NULL) { |
f96637be | 1024 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1025 | return -EIO; |
1026 | } | |
1027 | ||
79a58d1f | 1028 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1029 | return -ENOENT; |
1030 | ||
79a58d1f | 1031 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1032 | to the same server. We may make this configurable later or |
1033 | use ses->maxReq */ | |
1da177e4 | 1034 | |
fb2036d8 | 1035 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1036 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1037 | len); |
6d9c6d54 VL |
1038 | return -EIO; |
1039 | } | |
1040 | ||
a891f0f8 | 1041 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
1042 | if (rc) |
1043 | return rc; | |
1044 | ||
79a58d1f | 1045 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1046 | and avoid races inside tcp sendmsg code that could cause corruption |
1047 | of smb data */ | |
1048 | ||
72ca545b | 1049 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 1050 | |
7ee1af76 JA |
1051 | rc = allocate_mid(ses, in_buf, &midQ); |
1052 | if (rc) { | |
72ca545b | 1053 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1054 | /* Update # of requests on wire to server */ |
a891f0f8 | 1055 | add_credits(ses->server, 1, 0); |
7ee1af76 | 1056 | return rc; |
1da177e4 LT |
1057 | } |
1058 | ||
ad009ac9 | 1059 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
1060 | if (rc) { |
1061 | mutex_unlock(&ses->server->srv_mutex); | |
1062 | goto out; | |
1063 | } | |
1da177e4 | 1064 | |
7c9421e1 | 1065 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
1066 | |
1067 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 1068 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1069 | cifs_in_send_dec(ses->server); |
1070 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1071 | |
1072 | if (rc < 0) | |
1073 | ses->server->sequence_number -= 2; | |
1074 | ||
72ca545b | 1075 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1076 | |
79a58d1f | 1077 | if (rc < 0) |
7ee1af76 JA |
1078 | goto out; |
1079 | ||
a891f0f8 | 1080 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 1081 | goto out; |
1da177e4 | 1082 | |
0ade640e | 1083 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1084 | if (rc != 0) { |
fb2036d8 | 1085 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1086 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1087 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1088 | /* no longer considered to be "in-flight" */ |
1089 | midQ->callback = DeleteMidQEntry; | |
1090 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 1091 | add_credits(ses->server, 1, 0); |
1be912dd JL |
1092 | return rc; |
1093 | } | |
1094 | spin_unlock(&GlobalMid_Lock); | |
1095 | } | |
1da177e4 | 1096 | |
3c1105df | 1097 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1098 | if (rc != 0) { |
a891f0f8 | 1099 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
1100 | return rc; |
1101 | } | |
50c2f753 | 1102 | |
2c8f981d | 1103 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1104 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1105 | rc = -EIO; |
f96637be | 1106 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1107 | goto out; |
1da177e4 | 1108 | } |
7ee1af76 | 1109 | |
d4e4854f | 1110 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1111 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1112 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1113 | out: |
3c1bf7e4 | 1114 | cifs_delete_mid(midQ); |
a891f0f8 | 1115 | add_credits(ses->server, 1, 0); |
1da177e4 | 1116 | |
7ee1af76 JA |
1117 | return rc; |
1118 | } | |
1da177e4 | 1119 | |
7ee1af76 JA |
1120 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1121 | blocking lock to return. */ | |
1122 | ||
1123 | static int | |
96daf2b0 | 1124 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1125 | struct smb_hdr *in_buf, |
1126 | struct smb_hdr *out_buf) | |
1127 | { | |
1128 | int bytes_returned; | |
96daf2b0 | 1129 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1130 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1131 | ||
1132 | /* We just modify the current in_buf to change | |
1133 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1134 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1135 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1136 | ||
1137 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1138 | pSMB->Timeout = 0; | |
88257360 | 1139 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1140 | |
1141 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1142 | &bytes_returned, 0); |
7ee1af76 JA |
1143 | } |
1144 | ||
1145 | int | |
96daf2b0 | 1146 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1147 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1148 | int *pbytes_returned) | |
1149 | { | |
1150 | int rc = 0; | |
1151 | int rstart = 0; | |
7ee1af76 | 1152 | struct mid_q_entry *midQ; |
96daf2b0 | 1153 | struct cifs_ses *ses; |
fb2036d8 PS |
1154 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1155 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1156 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1157 | |
1158 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1159 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1160 | return -EIO; |
1161 | } | |
1162 | ses = tcon->ses; | |
1163 | ||
79a58d1f | 1164 | if (ses->server == NULL) { |
f96637be | 1165 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1166 | return -EIO; |
1167 | } | |
1168 | ||
79a58d1f | 1169 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1170 | return -ENOENT; |
1171 | ||
79a58d1f | 1172 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1173 | to the same server. We may make this configurable later or |
1174 | use ses->maxReq */ | |
1175 | ||
fb2036d8 | 1176 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1177 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1178 | len); |
6d9c6d54 VL |
1179 | return -EIO; |
1180 | } | |
1181 | ||
a891f0f8 | 1182 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1183 | if (rc) |
1184 | return rc; | |
1185 | ||
79a58d1f | 1186 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1187 | and avoid races inside tcp sendmsg code that could cause corruption |
1188 | of smb data */ | |
1189 | ||
72ca545b | 1190 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1191 | |
1192 | rc = allocate_mid(ses, in_buf, &midQ); | |
1193 | if (rc) { | |
72ca545b | 1194 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1195 | return rc; |
1196 | } | |
1197 | ||
7ee1af76 | 1198 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1199 | if (rc) { |
3c1bf7e4 | 1200 | cifs_delete_mid(midQ); |
829049cb VL |
1201 | mutex_unlock(&ses->server->srv_mutex); |
1202 | return rc; | |
1203 | } | |
1da177e4 | 1204 | |
7c9421e1 | 1205 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1206 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1207 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1208 | cifs_in_send_dec(ses->server); |
1209 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1210 | |
1211 | if (rc < 0) | |
1212 | ses->server->sequence_number -= 2; | |
1213 | ||
72ca545b | 1214 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1215 | |
79a58d1f | 1216 | if (rc < 0) { |
3c1bf7e4 | 1217 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1218 | return rc; |
1219 | } | |
1220 | ||
1221 | /* Wait for a reply - allow signals to interrupt. */ | |
1222 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1223 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1224 | ((ses->server->tcpStatus != CifsGood) && |
1225 | (ses->server->tcpStatus != CifsNew))); | |
1226 | ||
1227 | /* Were we interrupted by a signal ? */ | |
1228 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1229 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1230 | ((ses->server->tcpStatus == CifsGood) || |
1231 | (ses->server->tcpStatus == CifsNew))) { | |
1232 | ||
1233 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1234 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1235 | blocking lock to return. */ | |
fb2036d8 | 1236 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1237 | if (rc) { |
3c1bf7e4 | 1238 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1239 | return rc; |
1240 | } | |
1241 | } else { | |
1242 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1243 | to cause the blocking lock to return. */ | |
1244 | ||
1245 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1246 | ||
1247 | /* If we get -ENOLCK back the lock may have | |
1248 | already been removed. Don't exit in this case. */ | |
1249 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1250 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1251 | return rc; |
1252 | } | |
1253 | } | |
1254 | ||
1be912dd JL |
1255 | rc = wait_for_response(ses->server, midQ); |
1256 | if (rc) { | |
fb2036d8 | 1257 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1258 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1259 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1260 | /* no longer considered to be "in-flight" */ |
1261 | midQ->callback = DeleteMidQEntry; | |
1262 | spin_unlock(&GlobalMid_Lock); | |
1263 | return rc; | |
1264 | } | |
1265 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1266 | } |
1be912dd JL |
1267 | |
1268 | /* We got the response - restart system call. */ | |
1269 | rstart = 1; | |
7ee1af76 JA |
1270 | } |
1271 | ||
3c1105df | 1272 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1273 | if (rc != 0) |
7ee1af76 | 1274 | return rc; |
50c2f753 | 1275 | |
17c8bfed | 1276 | /* rcvd frame is ok */ |
7c9421e1 | 1277 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1278 | rc = -EIO; |
f96637be | 1279 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1280 | goto out; |
1281 | } | |
1da177e4 | 1282 | |
d4e4854f | 1283 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1284 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1285 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1286 | out: |
3c1bf7e4 | 1287 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1288 | if (rstart && rc == -EACCES) |
1289 | return -ERESTARTSYS; | |
1da177e4 LT |
1290 | return rc; |
1291 | } |