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); |
f80eaedd | 140 | cifs_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 | }; | |
aa563d7b | 319 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
320 | rc = smb_send_kvec(server, &smb_msg, &sent); |
321 | if (rc < 0) | |
322 | goto uncork; | |
323 | ||
324 | total_len += sent; | |
325 | send_length += 4; | |
326 | } | |
327 | ||
662bf5bc PA |
328 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
329 | ||
07cd952f RS |
330 | for (j = 0; j < num_rqst; j++) { |
331 | iov = rqst[j].rq_iov; | |
332 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 333 | |
07cd952f | 334 | size = 0; |
662bf5bc PA |
335 | for (i = 0; i < n_vec; i++) { |
336 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 337 | size += iov[i].iov_len; |
662bf5bc | 338 | } |
97bc00b3 | 339 | |
aa563d7b | 340 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 341 | |
3ab3f2a1 | 342 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 343 | if (rc < 0) |
07cd952f | 344 | goto uncork; |
97bc00b3 JL |
345 | |
346 | total_len += sent; | |
07cd952f RS |
347 | |
348 | /* now walk the page array and send each page in it */ | |
349 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
350 | struct bio_vec bvec; | |
351 | ||
352 | bvec.bv_page = rqst[j].rq_pages[i]; | |
353 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
354 | &bvec.bv_offset); | |
355 | ||
aa563d7b | 356 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
357 | &bvec, 1, bvec.bv_len); |
358 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
359 | if (rc < 0) | |
360 | break; | |
361 | ||
362 | total_len += sent; | |
363 | } | |
97bc00b3 | 364 | } |
1da177e4 | 365 | |
97bc00b3 | 366 | uncork: |
b8eed283 JL |
367 | /* uncork it */ |
368 | val = 0; | |
369 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
370 | (char *)&val, sizeof(val)); | |
371 | ||
c713c877 | 372 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 373 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 374 | send_length, total_len); |
6f49f46b JL |
375 | /* |
376 | * If we have only sent part of an SMB then the next SMB could | |
377 | * be taken as the remainder of this one. We need to kill the | |
378 | * socket so the server throws away the partial SMB | |
379 | */ | |
edf1ae40 | 380 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
381 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
382 | server->hostname); | |
edf1ae40 | 383 | } |
9762c2d0 | 384 | smbd_done: |
d804d41d | 385 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
386 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
387 | rc); | |
d804d41d | 388 | else |
1da177e4 | 389 | rc = 0; |
1da177e4 LT |
390 | |
391 | return rc; | |
392 | } | |
393 | ||
6f49f46b | 394 | static int |
1f3a8f5f RS |
395 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
396 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 397 | { |
b2c96de7 RS |
398 | struct kvec iov; |
399 | struct smb2_transform_hdr tr_hdr; | |
400 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
401 | int rc; |
402 | ||
403 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
404 | return __smb_send_rqst(server, num_rqst, rqst); |
405 | ||
406 | if (num_rqst > MAX_COMPOUND - 1) | |
407 | return -ENOMEM; | |
7fb8986e | 408 | |
b2c96de7 RS |
409 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
410 | memset(&iov, 0, sizeof(iov)); | |
411 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
412 | ||
413 | iov.iov_base = &tr_hdr; | |
414 | iov.iov_len = sizeof(tr_hdr); | |
415 | cur_rqst[0].rq_iov = &iov; | |
416 | cur_rqst[0].rq_nvec = 1; | |
417 | ||
418 | if (!server->ops->init_transform_rq) { | |
419 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
420 | "is missing\n"); | |
7fb8986e PS |
421 | return -EIO; |
422 | } | |
6f49f46b | 423 | |
1f3a8f5f RS |
424 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
425 | &cur_rqst[0], rqst); | |
7fb8986e PS |
426 | if (rc) |
427 | return rc; | |
428 | ||
1f3a8f5f RS |
429 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
430 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 431 | return rc; |
6f49f46b JL |
432 | } |
433 | ||
0496e02d JL |
434 | int |
435 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
436 | unsigned int smb_buf_length) | |
437 | { | |
738f9de5 | 438 | struct kvec iov[2]; |
7fb8986e PS |
439 | struct smb_rqst rqst = { .rq_iov = iov, |
440 | .rq_nvec = 2 }; | |
0496e02d | 441 | |
738f9de5 PS |
442 | iov[0].iov_base = smb_buffer; |
443 | iov[0].iov_len = 4; | |
444 | iov[1].iov_base = (char *)smb_buffer + 4; | |
445 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 446 | |
07cd952f | 447 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
448 | } |
449 | ||
fc40f9cf | 450 | static int |
a891f0f8 | 451 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
bc205ed1 | 452 | int *credits) |
1da177e4 | 453 | { |
5bc59498 PS |
454 | int rc; |
455 | ||
fc40f9cf | 456 | spin_lock(&server->req_lock); |
a891f0f8 | 457 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 458 | /* oplock breaks must not be held up */ |
fc40f9cf | 459 | server->in_flight++; |
bc205ed1 | 460 | *credits -= 1; |
fc40f9cf | 461 | spin_unlock(&server->req_lock); |
27a97a61 VL |
462 | return 0; |
463 | } | |
464 | ||
27a97a61 | 465 | while (1) { |
bc205ed1 | 466 | if (*credits <= 0) { |
fc40f9cf | 467 | spin_unlock(&server->req_lock); |
789e6661 | 468 | cifs_num_waiters_inc(server); |
5bc59498 | 469 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 470 | has_credits(server, credits)); |
789e6661 | 471 | cifs_num_waiters_dec(server); |
5bc59498 PS |
472 | if (rc) |
473 | return rc; | |
fc40f9cf | 474 | spin_lock(&server->req_lock); |
27a97a61 | 475 | } else { |
c5797a94 | 476 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 477 | spin_unlock(&server->req_lock); |
27a97a61 | 478 | return -ENOENT; |
1da177e4 | 479 | } |
27a97a61 | 480 | |
2d86dbc9 PS |
481 | /* |
482 | * Can not count locking commands against total | |
483 | * as they are allowed to block on server. | |
484 | */ | |
27a97a61 VL |
485 | |
486 | /* update # of requests on the wire to server */ | |
a891f0f8 | 487 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 488 | *credits -= 1; |
fc40f9cf | 489 | server->in_flight++; |
2d86dbc9 | 490 | } |
fc40f9cf | 491 | spin_unlock(&server->req_lock); |
27a97a61 | 492 | break; |
1da177e4 LT |
493 | } |
494 | } | |
7ee1af76 JA |
495 | return 0; |
496 | } | |
1da177e4 | 497 | |
bc205ed1 | 498 | static int |
a891f0f8 PS |
499 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
500 | const int optype) | |
bc205ed1 | 501 | { |
eb4c7df6 SP |
502 | int *val; |
503 | ||
504 | val = server->ops->get_credits_field(server, optype); | |
505 | /* Since an echo is already inflight, no need to wait to send another */ | |
506 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
507 | return -EAGAIN; | |
508 | return wait_for_free_credits(server, timeout, val); | |
bc205ed1 PS |
509 | } |
510 | ||
cb7e9eab PS |
511 | int |
512 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
513 | unsigned int *num, unsigned int *credits) | |
514 | { | |
515 | *num = size; | |
516 | *credits = 0; | |
517 | return 0; | |
518 | } | |
519 | ||
96daf2b0 | 520 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
521 | struct mid_q_entry **ppmidQ) |
522 | { | |
1da177e4 | 523 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 524 | return -ENOENT; |
8fbbd365 VL |
525 | } |
526 | ||
527 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 528 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 529 | return -EAGAIN; |
8fbbd365 VL |
530 | } |
531 | ||
7f48558e | 532 | if (ses->status == CifsNew) { |
79a58d1f | 533 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 534 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 535 | return -EAGAIN; |
ad7a2926 | 536 | /* else ok - we are setting up session */ |
1da177e4 | 537 | } |
7f48558e SP |
538 | |
539 | if (ses->status == CifsExiting) { | |
540 | /* check if SMB session is bad because we are setting it up */ | |
541 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
542 | return -EAGAIN; | |
543 | /* else ok - we are shutting down session */ | |
544 | } | |
545 | ||
24b9b06b | 546 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 547 | if (*ppmidQ == NULL) |
7ee1af76 | 548 | return -ENOMEM; |
ddc8cf8f JL |
549 | spin_lock(&GlobalMid_Lock); |
550 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
551 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
552 | return 0; |
553 | } | |
554 | ||
0ade640e JL |
555 | static int |
556 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 557 | { |
0ade640e | 558 | int error; |
7ee1af76 | 559 | |
5853cc2a | 560 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 561 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
562 | if (error < 0) |
563 | return -ERESTARTSYS; | |
7ee1af76 | 564 | |
0ade640e | 565 | return 0; |
7ee1af76 JA |
566 | } |
567 | ||
fec344e3 JL |
568 | struct mid_q_entry * |
569 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
570 | { |
571 | int rc; | |
fec344e3 | 572 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
573 | struct mid_q_entry *mid; |
574 | ||
738f9de5 PS |
575 | if (rqst->rq_iov[0].iov_len != 4 || |
576 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
577 | return ERR_PTR(-EIO); | |
578 | ||
792af7b0 | 579 | /* enable signing if server requires it */ |
38d77c50 | 580 | if (server->sign) |
792af7b0 PS |
581 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
582 | ||
583 | mid = AllocMidQEntry(hdr, server); | |
584 | if (mid == NULL) | |
fec344e3 | 585 | return ERR_PTR(-ENOMEM); |
792af7b0 | 586 | |
fec344e3 | 587 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
588 | if (rc) { |
589 | DeleteMidQEntry(mid); | |
fec344e3 | 590 | return ERR_PTR(rc); |
ffc61ccb SP |
591 | } |
592 | ||
fec344e3 | 593 | return mid; |
792af7b0 | 594 | } |
133672ef | 595 | |
a6827c18 JL |
596 | /* |
597 | * Send a SMB request and set the callback function in the mid to handle | |
598 | * the result. Caller is responsible for dealing with timeouts. | |
599 | */ | |
600 | int | |
fec344e3 | 601 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 PS |
602 | mid_receive_t *receive, mid_callback_t *callback, |
603 | mid_handle_t *handle, void *cbdata, const int flags) | |
a6827c18 | 604 | { |
a891f0f8 | 605 | int rc, timeout, optype; |
a6827c18 | 606 | struct mid_q_entry *mid; |
cb7e9eab | 607 | unsigned int credits = 0; |
a6827c18 | 608 | |
a891f0f8 PS |
609 | timeout = flags & CIFS_TIMEOUT_MASK; |
610 | optype = flags & CIFS_OP_MASK; | |
611 | ||
cb7e9eab PS |
612 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
613 | rc = wait_for_free_request(server, timeout, optype); | |
614 | if (rc) | |
615 | return rc; | |
616 | credits = 1; | |
617 | } | |
a6827c18 JL |
618 | |
619 | mutex_lock(&server->srv_mutex); | |
fec344e3 JL |
620 | mid = server->ops->setup_async_request(server, rqst); |
621 | if (IS_ERR(mid)) { | |
a6827c18 | 622 | mutex_unlock(&server->srv_mutex); |
cb7e9eab | 623 | add_credits_and_wake_if(server, credits, optype); |
fec344e3 | 624 | return PTR_ERR(mid); |
a6827c18 JL |
625 | } |
626 | ||
44d22d84 | 627 | mid->receive = receive; |
a6827c18 JL |
628 | mid->callback = callback; |
629 | mid->callback_data = cbdata; | |
9b7c18a2 | 630 | mid->handle = handle; |
7c9421e1 | 631 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 632 | |
ffc61ccb SP |
633 | /* put it on the pending_mid_q */ |
634 | spin_lock(&GlobalMid_Lock); | |
635 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
636 | spin_unlock(&GlobalMid_Lock); | |
637 | ||
93d2cb6c LL |
638 | /* |
639 | * Need to store the time in mid before calling I/O. For call_async, | |
640 | * I/O response may come back and free the mid entry on another thread. | |
641 | */ | |
642 | cifs_save_when_sent(mid); | |
789e6661 | 643 | cifs_in_send_inc(server); |
1f3a8f5f | 644 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 645 | cifs_in_send_dec(server); |
ad313cb8 | 646 | |
820962dc | 647 | if (rc < 0) { |
ad313cb8 | 648 | server->sequence_number -= 2; |
820962dc RV |
649 | cifs_delete_mid(mid); |
650 | } | |
651 | ||
a6827c18 | 652 | mutex_unlock(&server->srv_mutex); |
789e6661 | 653 | |
ffc61ccb SP |
654 | if (rc == 0) |
655 | return 0; | |
a6827c18 | 656 | |
cb7e9eab | 657 | add_credits_and_wake_if(server, credits, optype); |
a6827c18 JL |
658 | return rc; |
659 | } | |
660 | ||
133672ef SF |
661 | /* |
662 | * | |
663 | * Send an SMB Request. No response info (other than return code) | |
664 | * needs to be parsed. | |
665 | * | |
666 | * flags indicate the type of request buffer and how long to wait | |
667 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
668 | * | |
669 | */ | |
670 | int | |
96daf2b0 | 671 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 672 | char *in_buf, int flags) |
133672ef SF |
673 | { |
674 | int rc; | |
675 | struct kvec iov[1]; | |
da502f7d | 676 | struct kvec rsp_iov; |
133672ef SF |
677 | int resp_buf_type; |
678 | ||
792af7b0 PS |
679 | iov[0].iov_base = in_buf; |
680 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 681 | flags |= CIFS_NO_RESP; |
da502f7d | 682 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 683 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 684 | |
133672ef SF |
685 | return rc; |
686 | } | |
687 | ||
053d5034 | 688 | static int |
3c1105df | 689 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
690 | { |
691 | int rc = 0; | |
692 | ||
f96637be JP |
693 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
694 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 695 | |
74dd92a8 | 696 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 697 | switch (mid->mid_state) { |
74dd92a8 | 698 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
699 | spin_unlock(&GlobalMid_Lock); |
700 | return rc; | |
74dd92a8 JL |
701 | case MID_RETRY_NEEDED: |
702 | rc = -EAGAIN; | |
703 | break; | |
71823baf JL |
704 | case MID_RESPONSE_MALFORMED: |
705 | rc = -EIO; | |
706 | break; | |
3c1105df JL |
707 | case MID_SHUTDOWN: |
708 | rc = -EHOSTDOWN; | |
709 | break; | |
74dd92a8 | 710 | default: |
3c1105df | 711 | list_del_init(&mid->qhead); |
f96637be JP |
712 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
713 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 714 | rc = -EIO; |
053d5034 JL |
715 | } |
716 | spin_unlock(&GlobalMid_Lock); | |
717 | ||
2b84a36c | 718 | DeleteMidQEntry(mid); |
053d5034 JL |
719 | return rc; |
720 | } | |
721 | ||
121b046a | 722 | static inline int |
fb2036d8 PS |
723 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
724 | struct mid_q_entry *mid) | |
76dcc26f | 725 | { |
121b046a | 726 | return server->ops->send_cancel ? |
fb2036d8 | 727 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
728 | } |
729 | ||
2c8f981d JL |
730 | int |
731 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
732 | bool log_error) | |
733 | { | |
792af7b0 | 734 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
735 | |
736 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
737 | |
738 | /* convert the length into a more usable form */ | |
38d77c50 | 739 | if (server->sign) { |
738f9de5 | 740 | struct kvec iov[2]; |
985e4ff0 | 741 | int rc = 0; |
738f9de5 PS |
742 | struct smb_rqst rqst = { .rq_iov = iov, |
743 | .rq_nvec = 2 }; | |
826a95e4 | 744 | |
738f9de5 PS |
745 | iov[0].iov_base = mid->resp_buf; |
746 | iov[0].iov_len = 4; | |
747 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
748 | iov[1].iov_len = len - 4; | |
2c8f981d | 749 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 750 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 751 | mid->sequence_number); |
985e4ff0 | 752 | if (rc) |
f96637be JP |
753 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
754 | rc); | |
2c8f981d JL |
755 | } |
756 | ||
757 | /* BB special case reconnect tid and uid here? */ | |
758 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
759 | } | |
760 | ||
fec344e3 JL |
761 | struct mid_q_entry * |
762 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
763 | { |
764 | int rc; | |
fec344e3 | 765 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
766 | struct mid_q_entry *mid; |
767 | ||
738f9de5 PS |
768 | if (rqst->rq_iov[0].iov_len != 4 || |
769 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
770 | return ERR_PTR(-EIO); | |
771 | ||
792af7b0 PS |
772 | rc = allocate_mid(ses, hdr, &mid); |
773 | if (rc) | |
fec344e3 JL |
774 | return ERR_PTR(rc); |
775 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
776 | if (rc) { | |
3c1bf7e4 | 777 | cifs_delete_mid(mid); |
fec344e3 JL |
778 | return ERR_PTR(rc); |
779 | } | |
780 | return mid; | |
792af7b0 PS |
781 | } |
782 | ||
4e34feb5 RS |
783 | static void |
784 | cifs_noop_callback(struct mid_q_entry *mid) | |
785 | { | |
786 | } | |
787 | ||
b8f57ee8 | 788 | int |
e0bba0b8 RS |
789 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
790 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
791 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 792 | { |
e0bba0b8 | 793 | int i, j, rc = 0; |
a891f0f8 | 794 | int timeout, optype; |
e0bba0b8 | 795 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
cb5c2e63 | 796 | unsigned int credits = 0; |
738f9de5 | 797 | char *buf; |
50c2f753 | 798 | |
a891f0f8 PS |
799 | timeout = flags & CIFS_TIMEOUT_MASK; |
800 | optype = flags & CIFS_OP_MASK; | |
133672ef | 801 | |
e0bba0b8 RS |
802 | for (i = 0; i < num_rqst; i++) |
803 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
804 | |
805 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 806 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
807 | return -EIO; |
808 | } | |
809 | ||
da502f7d | 810 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 811 | return -ENOENT; |
7ee1af76 | 812 | |
792af7b0 PS |
813 | /* |
814 | * Ensure that we do not send more than 50 overlapping requests | |
815 | * to the same server. We may make this configurable later or | |
816 | * use ses->maxReq. | |
817 | */ | |
a891f0f8 | 818 | rc = wait_for_free_request(ses->server, timeout, optype); |
da502f7d | 819 | if (rc) |
7ee1af76 | 820 | return rc; |
7ee1af76 | 821 | |
792af7b0 PS |
822 | /* |
823 | * Make sure that we sign in the same order that we send on this socket | |
824 | * and avoid races inside tcp sendmsg code that could cause corruption | |
825 | * of smb data. | |
826 | */ | |
7ee1af76 | 827 | |
72ca545b | 828 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 829 | |
e0bba0b8 RS |
830 | for (i = 0; i < num_rqst; i++) { |
831 | midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); | |
832 | if (IS_ERR(midQ[i])) { | |
833 | for (j = 0; j < i; j++) | |
834 | cifs_delete_mid(midQ[j]); | |
835 | mutex_unlock(&ses->server->srv_mutex); | |
836 | /* Update # of requests on wire to server */ | |
837 | add_credits(ses->server, 1, optype); | |
838 | return PTR_ERR(midQ[i]); | |
839 | } | |
840 | ||
841 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
4e34feb5 RS |
842 | /* |
843 | * We don't invoke the callback compounds unless it is the last | |
844 | * request. | |
845 | */ | |
846 | if (i < num_rqst - 1) | |
847 | midQ[i]->callback = cifs_noop_callback; | |
1da177e4 | 848 | } |
789e6661 | 849 | cifs_in_send_inc(ses->server); |
e0bba0b8 | 850 | rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); |
789e6661 | 851 | cifs_in_send_dec(ses->server); |
e0bba0b8 RS |
852 | |
853 | for (i = 0; i < num_rqst; i++) | |
854 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 855 | |
ad313cb8 JL |
856 | if (rc < 0) |
857 | ses->server->sequence_number -= 2; | |
e0bba0b8 | 858 | |
72ca545b | 859 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 860 | |
cb5c2e63 RS |
861 | if (rc < 0) |
862 | goto out; | |
e0bba0b8 | 863 | |
cb5c2e63 RS |
864 | /* |
865 | * Compounding is never used during session establish. | |
866 | */ | |
867 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
868 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, | |
869 | rqst[0].rq_nvec); | |
e0bba0b8 | 870 | |
cb5c2e63 RS |
871 | if (timeout == CIFS_ASYNC_OP) |
872 | goto out; | |
e0bba0b8 | 873 | |
cb5c2e63 | 874 | for (i = 0; i < num_rqst; i++) { |
e0bba0b8 RS |
875 | rc = wait_for_response(ses->server, midQ[i]); |
876 | if (rc != 0) { | |
43de1db3 SF |
877 | cifs_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", |
878 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); | |
e0bba0b8 RS |
879 | send_cancel(ses->server, &rqst[i], midQ[i]); |
880 | spin_lock(&GlobalMid_Lock); | |
881 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
882 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
883 | midQ[i]->callback = DeleteMidQEntry; | |
884 | spin_unlock(&GlobalMid_Lock); | |
885 | add_credits(ses->server, 1, optype); | |
886 | return rc; | |
887 | } | |
1be912dd | 888 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 889 | } |
cb5c2e63 RS |
890 | } |
891 | ||
892 | for (i = 0; i < num_rqst; i++) | |
893 | if (midQ[i]->resp_buf) | |
894 | credits += ses->server->ops->get_credits(midQ[i]); | |
895 | if (!credits) | |
896 | credits = 1; | |
897 | ||
898 | for (i = 0; i < num_rqst; i++) { | |
899 | if (rc < 0) | |
900 | goto out; | |
e0bba0b8 RS |
901 | |
902 | rc = cifs_sync_mid_result(midQ[i], ses->server); | |
903 | if (rc != 0) { | |
cb5c2e63 | 904 | add_credits(ses->server, credits, optype); |
1be912dd JL |
905 | return rc; |
906 | } | |
2b2bdfba | 907 | |
e0bba0b8 RS |
908 | if (!midQ[i]->resp_buf || |
909 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
910 | rc = -EIO; | |
911 | cifs_dbg(FYI, "Bad MID state?\n"); | |
912 | goto out; | |
913 | } | |
a891f0f8 | 914 | |
e0bba0b8 RS |
915 | buf = (char *)midQ[i]->resp_buf; |
916 | resp_iov[i].iov_base = buf; | |
917 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
918 | ses->server->vals->header_preamble_size; | |
919 | ||
920 | if (midQ[i]->large_buf) | |
921 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
922 | else | |
923 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
924 | ||
e0bba0b8 RS |
925 | rc = ses->server->ops->check_receive(midQ[i], ses->server, |
926 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 927 | |
e0bba0b8 RS |
928 | /* mark it so buf will not be freed by cifs_delete_mid */ |
929 | if ((flags & CIFS_NO_RESP) == 0) | |
930 | midQ[i]->resp_buf = NULL; | |
cb5c2e63 | 931 | |
e0bba0b8 | 932 | } |
cb5c2e63 RS |
933 | |
934 | /* | |
935 | * Compounding is never used during session establish. | |
936 | */ | |
937 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
938 | struct kvec iov = { | |
939 | .iov_base = resp_iov[0].iov_base, | |
940 | .iov_len = resp_iov[0].iov_len | |
941 | }; | |
942 | smb311_update_preauth_hash(ses, &iov, 1); | |
943 | } | |
944 | ||
7ee1af76 | 945 | out: |
4e34feb5 RS |
946 | /* |
947 | * This will dequeue all mids. After this it is important that the | |
948 | * demultiplex_thread will not process any of these mids any futher. | |
949 | * This is prevented above by using a noop callback that will not | |
950 | * wake this thread except for the very last PDU. | |
951 | */ | |
e0bba0b8 RS |
952 | for (i = 0; i < num_rqst; i++) |
953 | cifs_delete_mid(midQ[i]); | |
a891f0f8 | 954 | add_credits(ses->server, credits, optype); |
1da177e4 | 955 | |
d6e04ae6 SF |
956 | return rc; |
957 | } | |
1da177e4 | 958 | |
e0bba0b8 RS |
959 | int |
960 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
961 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
962 | struct kvec *resp_iov) | |
963 | { | |
964 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
965 | resp_iov); | |
966 | } | |
967 | ||
738f9de5 PS |
968 | int |
969 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
970 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
971 | const int flags, struct kvec *resp_iov) | |
972 | { | |
973 | struct smb_rqst rqst; | |
3cecf486 | 974 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
975 | int rc; |
976 | ||
3cecf486 | 977 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
978 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
979 | GFP_KERNEL); | |
117e3b7f SF |
980 | if (!new_iov) { |
981 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
982 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 983 | return -ENOMEM; |
117e3b7f | 984 | } |
3cecf486 RS |
985 | } else |
986 | new_iov = s_iov; | |
738f9de5 PS |
987 | |
988 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
989 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
990 | ||
991 | new_iov[0].iov_base = new_iov[1].iov_base; | |
992 | new_iov[0].iov_len = 4; | |
993 | new_iov[1].iov_base += 4; | |
994 | new_iov[1].iov_len -= 4; | |
995 | ||
996 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
997 | rqst.rq_iov = new_iov; | |
998 | rqst.rq_nvec = n_vec + 1; | |
999 | ||
1000 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1001 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1002 | kfree(new_iov); | |
738f9de5 PS |
1003 | return rc; |
1004 | } | |
1005 | ||
1da177e4 | 1006 | int |
96daf2b0 | 1007 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1008 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 1009 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
1010 | { |
1011 | int rc = 0; | |
1da177e4 | 1012 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1013 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1014 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1015 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
1da177e4 LT |
1016 | |
1017 | if (ses == NULL) { | |
f96637be | 1018 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1019 | return -EIO; |
1020 | } | |
79a58d1f | 1021 | if (ses->server == NULL) { |
f96637be | 1022 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1023 | return -EIO; |
1024 | } | |
1025 | ||
79a58d1f | 1026 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1027 | return -ENOENT; |
1028 | ||
79a58d1f | 1029 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1030 | to the same server. We may make this configurable later or |
1031 | use ses->maxReq */ | |
1da177e4 | 1032 | |
fb2036d8 | 1033 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1034 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1035 | len); |
6d9c6d54 VL |
1036 | return -EIO; |
1037 | } | |
1038 | ||
a891f0f8 | 1039 | rc = wait_for_free_request(ses->server, timeout, 0); |
7ee1af76 JA |
1040 | if (rc) |
1041 | return rc; | |
1042 | ||
79a58d1f | 1043 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1044 | and avoid races inside tcp sendmsg code that could cause corruption |
1045 | of smb data */ | |
1046 | ||
72ca545b | 1047 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 1048 | |
7ee1af76 JA |
1049 | rc = allocate_mid(ses, in_buf, &midQ); |
1050 | if (rc) { | |
72ca545b | 1051 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1052 | /* Update # of requests on wire to server */ |
a891f0f8 | 1053 | add_credits(ses->server, 1, 0); |
7ee1af76 | 1054 | return rc; |
1da177e4 LT |
1055 | } |
1056 | ||
ad009ac9 | 1057 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
1058 | if (rc) { |
1059 | mutex_unlock(&ses->server->srv_mutex); | |
1060 | goto out; | |
1061 | } | |
1da177e4 | 1062 | |
7c9421e1 | 1063 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
1064 | |
1065 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 1066 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1067 | cifs_in_send_dec(ses->server); |
1068 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1069 | |
1070 | if (rc < 0) | |
1071 | ses->server->sequence_number -= 2; | |
1072 | ||
72ca545b | 1073 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1074 | |
79a58d1f | 1075 | if (rc < 0) |
7ee1af76 JA |
1076 | goto out; |
1077 | ||
a891f0f8 | 1078 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 1079 | goto out; |
1da177e4 | 1080 | |
0ade640e | 1081 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1082 | if (rc != 0) { |
fb2036d8 | 1083 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1084 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1085 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1086 | /* no longer considered to be "in-flight" */ |
1087 | midQ->callback = DeleteMidQEntry; | |
1088 | spin_unlock(&GlobalMid_Lock); | |
a891f0f8 | 1089 | add_credits(ses->server, 1, 0); |
1be912dd JL |
1090 | return rc; |
1091 | } | |
1092 | spin_unlock(&GlobalMid_Lock); | |
1093 | } | |
1da177e4 | 1094 | |
3c1105df | 1095 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1096 | if (rc != 0) { |
a891f0f8 | 1097 | add_credits(ses->server, 1, 0); |
1da177e4 LT |
1098 | return rc; |
1099 | } | |
50c2f753 | 1100 | |
2c8f981d | 1101 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1102 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1103 | rc = -EIO; |
f96637be | 1104 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1105 | goto out; |
1da177e4 | 1106 | } |
7ee1af76 | 1107 | |
d4e4854f | 1108 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1109 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1110 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1111 | out: |
3c1bf7e4 | 1112 | cifs_delete_mid(midQ); |
a891f0f8 | 1113 | add_credits(ses->server, 1, 0); |
1da177e4 | 1114 | |
7ee1af76 JA |
1115 | return rc; |
1116 | } | |
1da177e4 | 1117 | |
7ee1af76 JA |
1118 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1119 | blocking lock to return. */ | |
1120 | ||
1121 | static int | |
96daf2b0 | 1122 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1123 | struct smb_hdr *in_buf, |
1124 | struct smb_hdr *out_buf) | |
1125 | { | |
1126 | int bytes_returned; | |
96daf2b0 | 1127 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1128 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1129 | ||
1130 | /* We just modify the current in_buf to change | |
1131 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1132 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1133 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1134 | ||
1135 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1136 | pSMB->Timeout = 0; | |
88257360 | 1137 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1138 | |
1139 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1140 | &bytes_returned, 0); |
7ee1af76 JA |
1141 | } |
1142 | ||
1143 | int | |
96daf2b0 | 1144 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1145 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1146 | int *pbytes_returned) | |
1147 | { | |
1148 | int rc = 0; | |
1149 | int rstart = 0; | |
7ee1af76 | 1150 | struct mid_q_entry *midQ; |
96daf2b0 | 1151 | struct cifs_ses *ses; |
fb2036d8 PS |
1152 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1153 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1154 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
7ee1af76 JA |
1155 | |
1156 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1157 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1158 | return -EIO; |
1159 | } | |
1160 | ses = tcon->ses; | |
1161 | ||
79a58d1f | 1162 | if (ses->server == NULL) { |
f96637be | 1163 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1164 | return -EIO; |
1165 | } | |
1166 | ||
79a58d1f | 1167 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1168 | return -ENOENT; |
1169 | ||
79a58d1f | 1170 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1171 | to the same server. We may make this configurable later or |
1172 | use ses->maxReq */ | |
1173 | ||
fb2036d8 | 1174 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1175 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1176 | len); |
6d9c6d54 VL |
1177 | return -EIO; |
1178 | } | |
1179 | ||
a891f0f8 | 1180 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0); |
7ee1af76 JA |
1181 | if (rc) |
1182 | return rc; | |
1183 | ||
79a58d1f | 1184 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1185 | and avoid races inside tcp sendmsg code that could cause corruption |
1186 | of smb data */ | |
1187 | ||
72ca545b | 1188 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1189 | |
1190 | rc = allocate_mid(ses, in_buf, &midQ); | |
1191 | if (rc) { | |
72ca545b | 1192 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1193 | return rc; |
1194 | } | |
1195 | ||
7ee1af76 | 1196 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1197 | if (rc) { |
3c1bf7e4 | 1198 | cifs_delete_mid(midQ); |
829049cb VL |
1199 | mutex_unlock(&ses->server->srv_mutex); |
1200 | return rc; | |
1201 | } | |
1da177e4 | 1202 | |
7c9421e1 | 1203 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1204 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1205 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1206 | cifs_in_send_dec(ses->server); |
1207 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1208 | |
1209 | if (rc < 0) | |
1210 | ses->server->sequence_number -= 2; | |
1211 | ||
72ca545b | 1212 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1213 | |
79a58d1f | 1214 | if (rc < 0) { |
3c1bf7e4 | 1215 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1216 | return rc; |
1217 | } | |
1218 | ||
1219 | /* Wait for a reply - allow signals to interrupt. */ | |
1220 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1221 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1222 | ((ses->server->tcpStatus != CifsGood) && |
1223 | (ses->server->tcpStatus != CifsNew))); | |
1224 | ||
1225 | /* Were we interrupted by a signal ? */ | |
1226 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1227 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1228 | ((ses->server->tcpStatus == CifsGood) || |
1229 | (ses->server->tcpStatus == CifsNew))) { | |
1230 | ||
1231 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1232 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1233 | blocking lock to return. */ | |
fb2036d8 | 1234 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1235 | if (rc) { |
3c1bf7e4 | 1236 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1237 | return rc; |
1238 | } | |
1239 | } else { | |
1240 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1241 | to cause the blocking lock to return. */ | |
1242 | ||
1243 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1244 | ||
1245 | /* If we get -ENOLCK back the lock may have | |
1246 | already been removed. Don't exit in this case. */ | |
1247 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1248 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1249 | return rc; |
1250 | } | |
1251 | } | |
1252 | ||
1be912dd JL |
1253 | rc = wait_for_response(ses->server, midQ); |
1254 | if (rc) { | |
fb2036d8 | 1255 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1256 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1257 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1258 | /* no longer considered to be "in-flight" */ |
1259 | midQ->callback = DeleteMidQEntry; | |
1260 | spin_unlock(&GlobalMid_Lock); | |
1261 | return rc; | |
1262 | } | |
1263 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1264 | } |
1be912dd JL |
1265 | |
1266 | /* We got the response - restart system call. */ | |
1267 | rstart = 1; | |
7ee1af76 JA |
1268 | } |
1269 | ||
3c1105df | 1270 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1271 | if (rc != 0) |
7ee1af76 | 1272 | return rc; |
50c2f753 | 1273 | |
17c8bfed | 1274 | /* rcvd frame is ok */ |
7c9421e1 | 1275 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1276 | rc = -EIO; |
f96637be | 1277 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1278 | goto out; |
1279 | } | |
1da177e4 | 1280 | |
d4e4854f | 1281 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1282 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1283 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1284 | out: |
3c1bf7e4 | 1285 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1286 | if (rstart && rc == -EACCES) |
1287 | return -ERESTARTSYS; | |
1da177e4 LT |
1288 | return rc; |
1289 | } |