Commit | Line | Data |
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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> | |
14e25977 | 36 | #include <linux/sched/signal.h> |
1da177e4 LT |
37 | #include "cifspdu.h" |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_debug.h" | |
8bd68c6e | 41 | #include "smb2proto.h" |
9762c2d0 | 42 | #include "smbdirect.h" |
50c2f753 | 43 | |
3cecf486 RS |
44 | /* Max number of iovectors we can use off the stack when sending requests. */ |
45 | #define CIFS_MAX_IOV_SIZE 8 | |
46 | ||
2dc7e1c0 PS |
47 | void |
48 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
49 | { |
50 | wake_up_process(mid->callback_data); | |
51 | } | |
52 | ||
a6827c18 | 53 | struct mid_q_entry * |
24b9b06b | 54 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
55 | { |
56 | struct mid_q_entry *temp; | |
57 | ||
24b9b06b | 58 | if (server == NULL) { |
f96637be | 59 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
1da177e4 LT |
60 | return NULL; |
61 | } | |
50c2f753 | 62 | |
232087cb | 63 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
a6f74e80 | 64 | memset(temp, 0, sizeof(struct mid_q_entry)); |
696e420b | 65 | kref_init(&temp->refcount); |
a6f74e80 N |
66 | temp->mid = get_mid(smb_buffer); |
67 | temp->pid = current->pid; | |
68 | temp->command = cpu_to_le16(smb_buffer->Command); | |
69 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 70 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
71 | /* when mid allocated can be before when sent */ |
72 | temp->when_alloc = jiffies; | |
73 | temp->server = server; | |
2b84a36c | 74 | |
a6f74e80 N |
75 | /* |
76 | * The default is for the mid to be synchronous, so the | |
77 | * default callback just wakes up the current task. | |
78 | */ | |
f1f27ad7 VW |
79 | get_task_struct(current); |
80 | temp->creator = current; | |
a6f74e80 N |
81 | temp->callback = cifs_wake_up_task; |
82 | temp->callback_data = current; | |
1da177e4 | 83 | |
1da177e4 | 84 | atomic_inc(&midCount); |
7c9421e1 | 85 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
86 | return temp; |
87 | } | |
88 | ||
696e420b LP |
89 | static void _cifs_mid_q_entry_release(struct kref *refcount) |
90 | { | |
abe57073 PS |
91 | struct mid_q_entry *midEntry = |
92 | container_of(refcount, struct mid_q_entry, refcount); | |
1047abc1 | 93 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 94 | __le16 command = midEntry->server->vals->lock_cmd; |
433b8dd7 | 95 | __u16 smb_cmd = le16_to_cpu(midEntry->command); |
1047abc1 | 96 | unsigned long now; |
433b8dd7 | 97 | unsigned long roundtrip_time; |
1047abc1 | 98 | #endif |
7b71843f PS |
99 | struct TCP_Server_Info *server = midEntry->server; |
100 | ||
101 | if (midEntry->resp_buf && (midEntry->mid_flags & MID_WAIT_CANCELLED) && | |
102 | midEntry->mid_state == MID_RESPONSE_RECEIVED && | |
103 | server->ops->handle_cancelled_mid) | |
104 | server->ops->handle_cancelled_mid(midEntry->resp_buf, server); | |
105 | ||
7c9421e1 | 106 | midEntry->mid_state = MID_FREE; |
8097531a | 107 | atomic_dec(&midCount); |
7c9421e1 | 108 | if (midEntry->large_buf) |
b8643e1b SF |
109 | cifs_buf_release(midEntry->resp_buf); |
110 | else | |
111 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
112 | #ifdef CONFIG_CIFS_STATS2 |
113 | now = jiffies; | |
433b8dd7 | 114 | if (now < midEntry->when_alloc) |
a0a3036b | 115 | cifs_server_dbg(VFS, "Invalid mid allocation time\n"); |
433b8dd7 SF |
116 | roundtrip_time = now - midEntry->when_alloc; |
117 | ||
118 | if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) { | |
119 | if (atomic_read(&server->num_cmds[smb_cmd]) == 0) { | |
120 | server->slowest_cmd[smb_cmd] = roundtrip_time; | |
121 | server->fastest_cmd[smb_cmd] = roundtrip_time; | |
122 | } else { | |
123 | if (server->slowest_cmd[smb_cmd] < roundtrip_time) | |
124 | server->slowest_cmd[smb_cmd] = roundtrip_time; | |
125 | else if (server->fastest_cmd[smb_cmd] > roundtrip_time) | |
126 | server->fastest_cmd[smb_cmd] = roundtrip_time; | |
127 | } | |
128 | cifs_stats_inc(&server->num_cmds[smb_cmd]); | |
129 | server->time_per_cmd[smb_cmd] += roundtrip_time; | |
130 | } | |
00778e22 SF |
131 | /* |
132 | * commands taking longer than one second (default) can be indications | |
133 | * that something is wrong, unless it is quite a slow link or a very | |
134 | * busy server. Note that this calc is unlikely or impossible to wrap | |
135 | * as long as slow_rsp_threshold is not set way above recommended max | |
136 | * value (32767 ie 9 hours) and is generally harmless even if wrong | |
137 | * since only affects debug counters - so leaving the calc as simple | |
138 | * comparison rather than doing multiple conversions and overflow | |
139 | * checks | |
140 | */ | |
141 | if ((slow_rsp_threshold != 0) && | |
142 | time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && | |
020eec5f | 143 | (midEntry->command != command)) { |
f5942db5 SF |
144 | /* |
145 | * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command | |
146 | * NB: le16_to_cpu returns unsigned so can not be negative below | |
147 | */ | |
433b8dd7 SF |
148 | if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) |
149 | cifs_stats_inc(&server->smb2slowcmd[smb_cmd]); | |
468d6779 | 150 | |
433b8dd7 | 151 | trace_smb3_slow_rsp(smb_cmd, midEntry->mid, midEntry->pid, |
020eec5f SF |
152 | midEntry->when_sent, midEntry->when_received); |
153 | if (cifsFYI & CIFS_TIMER) { | |
a0a3036b JP |
154 | pr_debug("slow rsp: cmd %d mid %llu", |
155 | midEntry->command, midEntry->mid); | |
156 | cifs_info("A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
157 | now - midEntry->when_alloc, | |
158 | now - midEntry->when_sent, | |
159 | now - midEntry->when_received); | |
1047abc1 SF |
160 | } |
161 | } | |
162 | #endif | |
f1f27ad7 | 163 | put_task_struct(midEntry->creator); |
abe57073 PS |
164 | |
165 | mempool_free(midEntry, cifs_mid_poolp); | |
166 | } | |
167 | ||
168 | void cifs_mid_q_entry_release(struct mid_q_entry *midEntry) | |
169 | { | |
170 | spin_lock(&GlobalMid_Lock); | |
171 | kref_put(&midEntry->refcount, _cifs_mid_q_entry_release); | |
172 | spin_unlock(&GlobalMid_Lock); | |
173 | } | |
174 | ||
175 | void DeleteMidQEntry(struct mid_q_entry *midEntry) | |
176 | { | |
696e420b | 177 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
178 | } |
179 | ||
3c1bf7e4 PS |
180 | void |
181 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
182 | { |
183 | spin_lock(&GlobalMid_Lock); | |
abe57073 PS |
184 | if (!(mid->mid_flags & MID_DELETED)) { |
185 | list_del_init(&mid->qhead); | |
186 | mid->mid_flags |= MID_DELETED; | |
187 | } | |
ddc8cf8f JL |
188 | spin_unlock(&GlobalMid_Lock); |
189 | ||
190 | DeleteMidQEntry(mid); | |
191 | } | |
192 | ||
6f49f46b JL |
193 | /* |
194 | * smb_send_kvec - send an array of kvecs to the server | |
195 | * @server: Server to send the data to | |
3ab3f2a1 | 196 | * @smb_msg: Message to send |
6f49f46b JL |
197 | * @sent: amount of data sent on socket is stored here |
198 | * | |
199 | * Our basic "send data to server" function. Should be called with srv_mutex | |
200 | * held. The caller is responsible for handling the results. | |
201 | */ | |
d6e04ae6 | 202 | static int |
3ab3f2a1 AV |
203 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
204 | size_t *sent) | |
1da177e4 LT |
205 | { |
206 | int rc = 0; | |
3ab3f2a1 | 207 | int retries = 0; |
edf1ae40 | 208 | struct socket *ssocket = server->ssocket; |
50c2f753 | 209 | |
6f49f46b JL |
210 | *sent = 0; |
211 | ||
3ab3f2a1 AV |
212 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
213 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
214 | smb_msg->msg_control = NULL; | |
215 | smb_msg->msg_controllen = 0; | |
0496e02d | 216 | if (server->noblocksnd) |
3ab3f2a1 | 217 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 218 | else |
3ab3f2a1 | 219 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 220 | |
3ab3f2a1 | 221 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
222 | /* |
223 | * If blocking send, we try 3 times, since each can block | |
224 | * for 5 seconds. For nonblocking we have to try more | |
225 | * but wait increasing amounts of time allowing time for | |
226 | * socket to clear. The overall time we wait in either | |
227 | * case to send on the socket is about 15 seconds. | |
228 | * Similarly we wait for 15 seconds for a response from | |
229 | * the server in SendReceive[2] for the server to send | |
230 | * a response back for most types of requests (except | |
231 | * SMB Write past end of file which can be slow, and | |
232 | * blocking lock operations). NFS waits slightly longer | |
233 | * than CIFS, but this can make it take longer for | |
234 | * nonresponsive servers to be detected and 15 seconds | |
235 | * is more than enough time for modern networks to | |
236 | * send a packet. In most cases if we fail to send | |
237 | * after the retries we will kill the socket and | |
238 | * reconnect which may clear the network problem. | |
239 | */ | |
3ab3f2a1 | 240 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 241 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
242 | retries++; |
243 | if (retries >= 14 || | |
244 | (!server->noblocksnd && (retries > 2))) { | |
afe6f653 | 245 | cifs_server_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
f96637be | 246 | ssocket); |
3ab3f2a1 | 247 | return -EAGAIN; |
1da177e4 | 248 | } |
3ab3f2a1 | 249 | msleep(1 << retries); |
1da177e4 LT |
250 | continue; |
251 | } | |
6f49f46b | 252 | |
79a58d1f | 253 | if (rc < 0) |
3ab3f2a1 | 254 | return rc; |
6f49f46b | 255 | |
79a58d1f | 256 | if (rc == 0) { |
3e84469d SF |
257 | /* should never happen, letting socket clear before |
258 | retrying is our only obvious option here */ | |
afe6f653 | 259 | cifs_server_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
260 | msleep(500); |
261 | continue; | |
d6e04ae6 | 262 | } |
6f49f46b | 263 | |
3ab3f2a1 AV |
264 | /* send was at least partially successful */ |
265 | *sent += rc; | |
266 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 267 | } |
3ab3f2a1 | 268 | return 0; |
97bc00b3 JL |
269 | } |
270 | ||
35e2cc1b | 271 | unsigned long |
81f39f95 | 272 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
273 | { |
274 | unsigned int i; | |
35e2cc1b PA |
275 | struct kvec *iov; |
276 | int nvec; | |
a26054d1 JL |
277 | unsigned long buflen = 0; |
278 | ||
81f39f95 RS |
279 | if (server->vals->header_preamble_size == 0 && |
280 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
281 | iov = &rqst->rq_iov[1]; |
282 | nvec = rqst->rq_nvec - 1; | |
283 | } else { | |
284 | iov = rqst->rq_iov; | |
285 | nvec = rqst->rq_nvec; | |
286 | } | |
287 | ||
a26054d1 | 288 | /* total up iov array first */ |
35e2cc1b | 289 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
290 | buflen += iov[i].iov_len; |
291 | ||
c06a0f2d LL |
292 | /* |
293 | * Add in the page array if there is one. The caller needs to make | |
294 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
295 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
296 | * PAGE_SIZE. | |
297 | */ | |
a26054d1 | 298 | if (rqst->rq_npages) { |
c06a0f2d LL |
299 | if (rqst->rq_npages == 1) |
300 | buflen += rqst->rq_tailsz; | |
301 | else { | |
302 | /* | |
303 | * If there is more than one page, calculate the | |
304 | * buffer length based on rq_offset and rq_tailsz | |
305 | */ | |
306 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
307 | rqst->rq_offset; | |
308 | buflen += rqst->rq_tailsz; | |
309 | } | |
a26054d1 JL |
310 | } |
311 | ||
312 | return buflen; | |
313 | } | |
314 | ||
6f49f46b | 315 | static int |
07cd952f RS |
316 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
317 | struct smb_rqst *rqst) | |
6f49f46b | 318 | { |
07cd952f RS |
319 | int rc = 0; |
320 | struct kvec *iov; | |
321 | int n_vec; | |
322 | unsigned int send_length = 0; | |
323 | unsigned int i, j; | |
b30c74c7 | 324 | sigset_t mask, oldmask; |
3ab3f2a1 | 325 | size_t total_len = 0, sent, size; |
b8eed283 | 326 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 327 | struct msghdr smb_msg; |
c713c877 RS |
328 | __be32 rfc1002_marker; |
329 | ||
4357d45f LL |
330 | if (cifs_rdma_enabled(server)) { |
331 | /* return -EAGAIN when connecting or reconnecting */ | |
332 | rc = -EAGAIN; | |
333 | if (server->smbd_conn) | |
334 | rc = smbd_send(server, num_rqst, rqst); | |
9762c2d0 LL |
335 | goto smbd_done; |
336 | } | |
afc18a6f | 337 | |
ea702b80 | 338 | if (ssocket == NULL) |
afc18a6f | 339 | return -EAGAIN; |
ea702b80 | 340 | |
214a5ea0 | 341 | if (fatal_signal_pending(current)) { |
6988a619 PA |
342 | cifs_dbg(FYI, "signal pending before send request\n"); |
343 | return -ERESTARTSYS; | |
b30c74c7 PS |
344 | } |
345 | ||
b8eed283 | 346 | /* cork the socket */ |
db10538a | 347 | tcp_sock_set_cork(ssocket->sk, true); |
b8eed283 | 348 | |
07cd952f | 349 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 350 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
351 | rfc1002_marker = cpu_to_be32(send_length); |
352 | ||
b30c74c7 PS |
353 | /* |
354 | * We should not allow signals to interrupt the network send because | |
355 | * any partial send will cause session reconnects thus increasing | |
356 | * latency of system calls and overload a server with unnecessary | |
357 | * requests. | |
358 | */ | |
359 | ||
360 | sigfillset(&mask); | |
361 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
362 | ||
c713c877 RS |
363 | /* Generate a rfc1002 marker for SMB2+ */ |
364 | if (server->vals->header_preamble_size == 0) { | |
365 | struct kvec hiov = { | |
366 | .iov_base = &rfc1002_marker, | |
367 | .iov_len = 4 | |
368 | }; | |
aa563d7b | 369 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
370 | rc = smb_send_kvec(server, &smb_msg, &sent); |
371 | if (rc < 0) | |
b30c74c7 | 372 | goto unmask; |
c713c877 RS |
373 | |
374 | total_len += sent; | |
375 | send_length += 4; | |
376 | } | |
377 | ||
662bf5bc PA |
378 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
379 | ||
07cd952f RS |
380 | for (j = 0; j < num_rqst; j++) { |
381 | iov = rqst[j].rq_iov; | |
382 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 383 | |
07cd952f | 384 | size = 0; |
662bf5bc PA |
385 | for (i = 0; i < n_vec; i++) { |
386 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 387 | size += iov[i].iov_len; |
662bf5bc | 388 | } |
97bc00b3 | 389 | |
aa563d7b | 390 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 391 | |
3ab3f2a1 | 392 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 393 | if (rc < 0) |
b30c74c7 | 394 | goto unmask; |
97bc00b3 JL |
395 | |
396 | total_len += sent; | |
07cd952f RS |
397 | |
398 | /* now walk the page array and send each page in it */ | |
399 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
400 | struct bio_vec bvec; | |
401 | ||
402 | bvec.bv_page = rqst[j].rq_pages[i]; | |
403 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
404 | &bvec.bv_offset); | |
405 | ||
aa563d7b | 406 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
407 | &bvec, 1, bvec.bv_len); |
408 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
409 | if (rc < 0) | |
410 | break; | |
411 | ||
412 | total_len += sent; | |
413 | } | |
97bc00b3 | 414 | } |
1da177e4 | 415 | |
b30c74c7 PS |
416 | unmask: |
417 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
418 | ||
419 | /* | |
420 | * If signal is pending but we have already sent the whole packet to | |
421 | * the server we need to return success status to allow a corresponding | |
422 | * mid entry to be kept in the pending requests queue thus allowing | |
423 | * to handle responses from the server by the client. | |
424 | * | |
425 | * If only part of the packet has been sent there is no need to hide | |
426 | * interrupt because the session will be reconnected anyway, so there | |
427 | * won't be any response from the server to handle. | |
428 | */ | |
429 | ||
430 | if (signal_pending(current) && (total_len != send_length)) { | |
431 | cifs_dbg(FYI, "signal is pending after attempt to send\n"); | |
214a5ea0 | 432 | rc = -ERESTARTSYS; |
b30c74c7 PS |
433 | } |
434 | ||
b8eed283 | 435 | /* uncork it */ |
db10538a | 436 | tcp_sock_set_cork(ssocket->sk, false); |
b8eed283 | 437 | |
c713c877 | 438 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 439 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 440 | send_length, total_len); |
6f49f46b JL |
441 | /* |
442 | * If we have only sent part of an SMB then the next SMB could | |
443 | * be taken as the remainder of this one. We need to kill the | |
444 | * socket so the server throws away the partial SMB | |
445 | */ | |
edf1ae40 | 446 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
447 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
448 | server->hostname); | |
edf1ae40 | 449 | } |
9762c2d0 | 450 | smbd_done: |
d804d41d | 451 | if (rc < 0 && rc != -EINTR) |
afe6f653 | 452 | cifs_server_dbg(VFS, "Error %d sending data on socket to server\n", |
f96637be | 453 | rc); |
ee13919c | 454 | else if (rc > 0) |
1da177e4 | 455 | rc = 0; |
1da177e4 LT |
456 | |
457 | return rc; | |
458 | } | |
459 | ||
6f49f46b | 460 | static int |
1f3a8f5f RS |
461 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
462 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 463 | { |
b2c96de7 | 464 | struct kvec iov; |
3946d0d0 | 465 | struct smb2_transform_hdr *tr_hdr; |
b2c96de7 | 466 | struct smb_rqst cur_rqst[MAX_COMPOUND]; |
7fb8986e PS |
467 | int rc; |
468 | ||
469 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
470 | return __smb_send_rqst(server, num_rqst, rqst); |
471 | ||
472 | if (num_rqst > MAX_COMPOUND - 1) | |
473 | return -ENOMEM; | |
7fb8986e | 474 | |
b2c96de7 | 475 | if (!server->ops->init_transform_rq) { |
a0a3036b | 476 | cifs_server_dbg(VFS, "Encryption requested but transform callback is missing\n"); |
7fb8986e PS |
477 | return -EIO; |
478 | } | |
6f49f46b | 479 | |
3946d0d0 LL |
480 | tr_hdr = kmalloc(sizeof(*tr_hdr), GFP_NOFS); |
481 | if (!tr_hdr) | |
482 | return -ENOMEM; | |
483 | ||
484 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); | |
485 | memset(&iov, 0, sizeof(iov)); | |
486 | memset(tr_hdr, 0, sizeof(*tr_hdr)); | |
487 | ||
488 | iov.iov_base = tr_hdr; | |
489 | iov.iov_len = sizeof(*tr_hdr); | |
490 | cur_rqst[0].rq_iov = &iov; | |
491 | cur_rqst[0].rq_nvec = 1; | |
492 | ||
1f3a8f5f RS |
493 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
494 | &cur_rqst[0], rqst); | |
7fb8986e | 495 | if (rc) |
3946d0d0 | 496 | goto out; |
7fb8986e | 497 | |
1f3a8f5f RS |
498 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
499 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
3946d0d0 LL |
500 | out: |
501 | kfree(tr_hdr); | |
7fb8986e | 502 | return rc; |
6f49f46b JL |
503 | } |
504 | ||
0496e02d JL |
505 | int |
506 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
507 | unsigned int smb_buf_length) | |
508 | { | |
738f9de5 | 509 | struct kvec iov[2]; |
7fb8986e PS |
510 | struct smb_rqst rqst = { .rq_iov = iov, |
511 | .rq_nvec = 2 }; | |
0496e02d | 512 | |
738f9de5 PS |
513 | iov[0].iov_base = smb_buffer; |
514 | iov[0].iov_len = 4; | |
515 | iov[1].iov_base = (char *)smb_buffer + 4; | |
516 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 517 | |
07cd952f | 518 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
519 | } |
520 | ||
fc40f9cf | 521 | static int |
b227d215 | 522 | wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits, |
2b53b929 RS |
523 | const int timeout, const int flags, |
524 | unsigned int *instance) | |
1da177e4 | 525 | { |
19e88867 | 526 | long rc; |
4230cff8 RS |
527 | int *credits; |
528 | int optype; | |
2b53b929 | 529 | long int t; |
cd7b699b | 530 | int scredits = server->credits; |
2b53b929 RS |
531 | |
532 | if (timeout < 0) | |
533 | t = MAX_JIFFY_OFFSET; | |
534 | else | |
535 | t = msecs_to_jiffies(timeout); | |
4230cff8 RS |
536 | |
537 | optype = flags & CIFS_OP_MASK; | |
5bc59498 | 538 | |
34f4deb7 PS |
539 | *instance = 0; |
540 | ||
4230cff8 RS |
541 | credits = server->ops->get_credits_field(server, optype); |
542 | /* Since an echo is already inflight, no need to wait to send another */ | |
543 | if (*credits <= 0 && optype == CIFS_ECHO_OP) | |
544 | return -EAGAIN; | |
545 | ||
fc40f9cf | 546 | spin_lock(&server->req_lock); |
392e1c5d | 547 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) { |
1da177e4 | 548 | /* oplock breaks must not be held up */ |
fc40f9cf | 549 | server->in_flight++; |
1b63f184 SF |
550 | if (server->in_flight > server->max_in_flight) |
551 | server->max_in_flight = server->in_flight; | |
bc205ed1 | 552 | *credits -= 1; |
34f4deb7 | 553 | *instance = server->reconnect_instance; |
fc40f9cf | 554 | spin_unlock(&server->req_lock); |
27a97a61 VL |
555 | return 0; |
556 | } | |
557 | ||
27a97a61 | 558 | while (1) { |
b227d215 | 559 | if (*credits < num_credits) { |
fc40f9cf | 560 | spin_unlock(&server->req_lock); |
789e6661 | 561 | cifs_num_waiters_inc(server); |
2b53b929 RS |
562 | rc = wait_event_killable_timeout(server->request_q, |
563 | has_credits(server, credits, num_credits), t); | |
789e6661 | 564 | cifs_num_waiters_dec(server); |
2b53b929 | 565 | if (!rc) { |
7937ca96 | 566 | trace_smb3_credit_timeout(server->CurrentMid, |
9eec21bf | 567 | server->hostname, num_credits, 0); |
afe6f653 | 568 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
2b53b929 | 569 | timeout); |
7de03948 | 570 | return -EBUSY; |
2b53b929 RS |
571 | } |
572 | if (rc == -ERESTARTSYS) | |
573 | return -ERESTARTSYS; | |
fc40f9cf | 574 | spin_lock(&server->req_lock); |
27a97a61 | 575 | } else { |
c5797a94 | 576 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 577 | spin_unlock(&server->req_lock); |
27a97a61 | 578 | return -ENOENT; |
1da177e4 | 579 | } |
27a97a61 | 580 | |
16b34aa4 RS |
581 | /* |
582 | * For normal commands, reserve the last MAX_COMPOUND | |
583 | * credits to compound requests. | |
584 | * Otherwise these compounds could be permanently | |
585 | * starved for credits by single-credit requests. | |
586 | * | |
587 | * To prevent spinning CPU, block this thread until | |
588 | * there are >MAX_COMPOUND credits available. | |
589 | * But only do this is we already have a lot of | |
590 | * credits in flight to avoid triggering this check | |
591 | * for servers that are slow to hand out credits on | |
592 | * new sessions. | |
593 | */ | |
594 | if (!optype && num_credits == 1 && | |
595 | server->in_flight > 2 * MAX_COMPOUND && | |
596 | *credits <= MAX_COMPOUND) { | |
597 | spin_unlock(&server->req_lock); | |
598 | cifs_num_waiters_inc(server); | |
2b53b929 RS |
599 | rc = wait_event_killable_timeout( |
600 | server->request_q, | |
16b34aa4 | 601 | has_credits(server, credits, |
2b53b929 RS |
602 | MAX_COMPOUND + 1), |
603 | t); | |
16b34aa4 | 604 | cifs_num_waiters_dec(server); |
2b53b929 | 605 | if (!rc) { |
7937ca96 SF |
606 | trace_smb3_credit_timeout( |
607 | server->CurrentMid, | |
9eec21bf SF |
608 | server->hostname, num_credits, |
609 | 0); | |
afe6f653 | 610 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
2b53b929 | 611 | timeout); |
7de03948 | 612 | return -EBUSY; |
2b53b929 RS |
613 | } |
614 | if (rc == -ERESTARTSYS) | |
615 | return -ERESTARTSYS; | |
16b34aa4 RS |
616 | spin_lock(&server->req_lock); |
617 | continue; | |
618 | } | |
619 | ||
2d86dbc9 PS |
620 | /* |
621 | * Can not count locking commands against total | |
622 | * as they are allowed to block on server. | |
623 | */ | |
27a97a61 VL |
624 | |
625 | /* update # of requests on the wire to server */ | |
4230cff8 | 626 | if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) { |
b227d215 | 627 | *credits -= num_credits; |
cd7b699b | 628 | scredits = *credits; |
b227d215 | 629 | server->in_flight += num_credits; |
1b63f184 SF |
630 | if (server->in_flight > server->max_in_flight) |
631 | server->max_in_flight = server->in_flight; | |
34f4deb7 | 632 | *instance = server->reconnect_instance; |
2d86dbc9 | 633 | } |
fc40f9cf | 634 | spin_unlock(&server->req_lock); |
cd7b699b SP |
635 | |
636 | trace_smb3_add_credits(server->CurrentMid, | |
637 | server->hostname, scredits, -(num_credits)); | |
638 | cifs_dbg(FYI, "%s: remove %u credits total=%d\n", | |
639 | __func__, num_credits, scredits); | |
27a97a61 | 640 | break; |
1da177e4 LT |
641 | } |
642 | } | |
7ee1af76 JA |
643 | return 0; |
644 | } | |
1da177e4 | 645 | |
bc205ed1 | 646 | static int |
480b1cb9 RS |
647 | wait_for_free_request(struct TCP_Server_Info *server, const int flags, |
648 | unsigned int *instance) | |
bc205ed1 | 649 | { |
2b53b929 RS |
650 | return wait_for_free_credits(server, 1, -1, flags, |
651 | instance); | |
bc205ed1 PS |
652 | } |
653 | ||
257b7809 RS |
654 | static int |
655 | wait_for_compound_request(struct TCP_Server_Info *server, int num, | |
656 | const int flags, unsigned int *instance) | |
657 | { | |
658 | int *credits; | |
cd7b699b | 659 | int scredits, sin_flight; |
257b7809 RS |
660 | |
661 | credits = server->ops->get_credits_field(server, flags & CIFS_OP_MASK); | |
662 | ||
663 | spin_lock(&server->req_lock); | |
cd7b699b SP |
664 | scredits = *credits; |
665 | sin_flight = server->in_flight; | |
666 | ||
257b7809 RS |
667 | if (*credits < num) { |
668 | /* | |
91792bb8 PS |
669 | * If the server is tight on resources or just gives us less |
670 | * credits for other reasons (e.g. requests are coming out of | |
671 | * order and the server delays granting more credits until it | |
672 | * processes a missing mid) and we exhausted most available | |
673 | * credits there may be situations when we try to send | |
674 | * a compound request but we don't have enough credits. At this | |
675 | * point the client needs to decide if it should wait for | |
676 | * additional credits or fail the request. If at least one | |
677 | * request is in flight there is a high probability that the | |
678 | * server will return enough credits to satisfy this compound | |
679 | * request. | |
680 | * | |
681 | * Return immediately if no requests in flight since we will be | |
682 | * stuck on waiting for credits. | |
257b7809 | 683 | */ |
91792bb8 | 684 | if (server->in_flight == 0) { |
257b7809 | 685 | spin_unlock(&server->req_lock); |
cd7b699b SP |
686 | trace_smb3_insufficient_credits(server->CurrentMid, |
687 | server->hostname, scredits, sin_flight); | |
688 | cifs_dbg(FYI, "%s: %d requests in flight, needed %d total=%d\n", | |
689 | __func__, sin_flight, num, scredits); | |
7de03948 | 690 | return -EDEADLK; |
257b7809 RS |
691 | } |
692 | } | |
693 | spin_unlock(&server->req_lock); | |
694 | ||
695 | return wait_for_free_credits(server, num, 60000, flags, | |
696 | instance); | |
697 | } | |
698 | ||
cb7e9eab PS |
699 | int |
700 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
335b7b62 | 701 | unsigned int *num, struct cifs_credits *credits) |
cb7e9eab PS |
702 | { |
703 | *num = size; | |
335b7b62 PS |
704 | credits->value = 0; |
705 | credits->instance = server->reconnect_instance; | |
cb7e9eab PS |
706 | return 0; |
707 | } | |
708 | ||
96daf2b0 | 709 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
710 | struct mid_q_entry **ppmidQ) |
711 | { | |
1da177e4 | 712 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 713 | return -ENOENT; |
8fbbd365 VL |
714 | } |
715 | ||
716 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 717 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 718 | return -EAGAIN; |
8fbbd365 VL |
719 | } |
720 | ||
7f48558e | 721 | if (ses->status == CifsNew) { |
79a58d1f | 722 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 723 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 724 | return -EAGAIN; |
ad7a2926 | 725 | /* else ok - we are setting up session */ |
1da177e4 | 726 | } |
7f48558e SP |
727 | |
728 | if (ses->status == CifsExiting) { | |
729 | /* check if SMB session is bad because we are setting it up */ | |
730 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
731 | return -EAGAIN; | |
732 | /* else ok - we are shutting down session */ | |
733 | } | |
734 | ||
24b9b06b | 735 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 736 | if (*ppmidQ == NULL) |
7ee1af76 | 737 | return -ENOMEM; |
ddc8cf8f JL |
738 | spin_lock(&GlobalMid_Lock); |
739 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
740 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
741 | return 0; |
742 | } | |
743 | ||
0ade640e JL |
744 | static int |
745 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 746 | { |
0ade640e | 747 | int error; |
7ee1af76 | 748 | |
5853cc2a | 749 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 750 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
751 | if (error < 0) |
752 | return -ERESTARTSYS; | |
7ee1af76 | 753 | |
0ade640e | 754 | return 0; |
7ee1af76 JA |
755 | } |
756 | ||
fec344e3 JL |
757 | struct mid_q_entry * |
758 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
759 | { |
760 | int rc; | |
fec344e3 | 761 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
762 | struct mid_q_entry *mid; |
763 | ||
738f9de5 PS |
764 | if (rqst->rq_iov[0].iov_len != 4 || |
765 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
766 | return ERR_PTR(-EIO); | |
767 | ||
792af7b0 | 768 | /* enable signing if server requires it */ |
38d77c50 | 769 | if (server->sign) |
792af7b0 PS |
770 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
771 | ||
772 | mid = AllocMidQEntry(hdr, server); | |
773 | if (mid == NULL) | |
fec344e3 | 774 | return ERR_PTR(-ENOMEM); |
792af7b0 | 775 | |
fec344e3 | 776 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
777 | if (rc) { |
778 | DeleteMidQEntry(mid); | |
fec344e3 | 779 | return ERR_PTR(rc); |
ffc61ccb SP |
780 | } |
781 | ||
fec344e3 | 782 | return mid; |
792af7b0 | 783 | } |
133672ef | 784 | |
a6827c18 JL |
785 | /* |
786 | * Send a SMB request and set the callback function in the mid to handle | |
787 | * the result. Caller is responsible for dealing with timeouts. | |
788 | */ | |
789 | int | |
fec344e3 | 790 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 | 791 | mid_receive_t *receive, mid_callback_t *callback, |
3349c3a7 PS |
792 | mid_handle_t *handle, void *cbdata, const int flags, |
793 | const struct cifs_credits *exist_credits) | |
a6827c18 | 794 | { |
480b1cb9 | 795 | int rc; |
a6827c18 | 796 | struct mid_q_entry *mid; |
335b7b62 | 797 | struct cifs_credits credits = { .value = 0, .instance = 0 }; |
34f4deb7 | 798 | unsigned int instance; |
480b1cb9 | 799 | int optype; |
a6827c18 | 800 | |
a891f0f8 PS |
801 | optype = flags & CIFS_OP_MASK; |
802 | ||
cb7e9eab | 803 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
480b1cb9 | 804 | rc = wait_for_free_request(server, flags, &instance); |
cb7e9eab PS |
805 | if (rc) |
806 | return rc; | |
335b7b62 | 807 | credits.value = 1; |
34f4deb7 | 808 | credits.instance = instance; |
3349c3a7 PS |
809 | } else |
810 | instance = exist_credits->instance; | |
a6827c18 JL |
811 | |
812 | mutex_lock(&server->srv_mutex); | |
3349c3a7 PS |
813 | |
814 | /* | |
815 | * We can't use credits obtained from the previous session to send this | |
816 | * request. Check if there were reconnects after we obtained credits and | |
817 | * return -EAGAIN in such cases to let callers handle it. | |
818 | */ | |
819 | if (instance != server->reconnect_instance) { | |
820 | mutex_unlock(&server->srv_mutex); | |
821 | add_credits_and_wake_if(server, &credits, optype); | |
822 | return -EAGAIN; | |
823 | } | |
824 | ||
fec344e3 JL |
825 | mid = server->ops->setup_async_request(server, rqst); |
826 | if (IS_ERR(mid)) { | |
a6827c18 | 827 | mutex_unlock(&server->srv_mutex); |
335b7b62 | 828 | add_credits_and_wake_if(server, &credits, optype); |
fec344e3 | 829 | return PTR_ERR(mid); |
a6827c18 JL |
830 | } |
831 | ||
44d22d84 | 832 | mid->receive = receive; |
a6827c18 JL |
833 | mid->callback = callback; |
834 | mid->callback_data = cbdata; | |
9b7c18a2 | 835 | mid->handle = handle; |
7c9421e1 | 836 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 837 | |
ffc61ccb SP |
838 | /* put it on the pending_mid_q */ |
839 | spin_lock(&GlobalMid_Lock); | |
840 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
841 | spin_unlock(&GlobalMid_Lock); | |
842 | ||
93d2cb6c LL |
843 | /* |
844 | * Need to store the time in mid before calling I/O. For call_async, | |
845 | * I/O response may come back and free the mid entry on another thread. | |
846 | */ | |
847 | cifs_save_when_sent(mid); | |
789e6661 | 848 | cifs_in_send_inc(server); |
1f3a8f5f | 849 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 850 | cifs_in_send_dec(server); |
ad313cb8 | 851 | |
820962dc | 852 | if (rc < 0) { |
c781af7e | 853 | revert_current_mid(server, mid->credits); |
ad313cb8 | 854 | server->sequence_number -= 2; |
820962dc RV |
855 | cifs_delete_mid(mid); |
856 | } | |
857 | ||
a6827c18 | 858 | mutex_unlock(&server->srv_mutex); |
789e6661 | 859 | |
ffc61ccb SP |
860 | if (rc == 0) |
861 | return 0; | |
a6827c18 | 862 | |
335b7b62 | 863 | add_credits_and_wake_if(server, &credits, optype); |
a6827c18 JL |
864 | return rc; |
865 | } | |
866 | ||
133672ef SF |
867 | /* |
868 | * | |
869 | * Send an SMB Request. No response info (other than return code) | |
870 | * needs to be parsed. | |
871 | * | |
872 | * flags indicate the type of request buffer and how long to wait | |
873 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
874 | * | |
875 | */ | |
876 | int | |
96daf2b0 | 877 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 878 | char *in_buf, int flags) |
133672ef SF |
879 | { |
880 | int rc; | |
881 | struct kvec iov[1]; | |
da502f7d | 882 | struct kvec rsp_iov; |
133672ef SF |
883 | int resp_buf_type; |
884 | ||
792af7b0 PS |
885 | iov[0].iov_base = in_buf; |
886 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
392e1c5d | 887 | flags |= CIFS_NO_RSP_BUF; |
da502f7d | 888 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 889 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 890 | |
133672ef SF |
891 | return rc; |
892 | } | |
893 | ||
053d5034 | 894 | static int |
3c1105df | 895 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
896 | { |
897 | int rc = 0; | |
898 | ||
f96637be JP |
899 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
900 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 901 | |
74dd92a8 | 902 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 903 | switch (mid->mid_state) { |
74dd92a8 | 904 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
905 | spin_unlock(&GlobalMid_Lock); |
906 | return rc; | |
74dd92a8 JL |
907 | case MID_RETRY_NEEDED: |
908 | rc = -EAGAIN; | |
909 | break; | |
71823baf JL |
910 | case MID_RESPONSE_MALFORMED: |
911 | rc = -EIO; | |
912 | break; | |
3c1105df JL |
913 | case MID_SHUTDOWN: |
914 | rc = -EHOSTDOWN; | |
915 | break; | |
74dd92a8 | 916 | default: |
abe57073 PS |
917 | if (!(mid->mid_flags & MID_DELETED)) { |
918 | list_del_init(&mid->qhead); | |
919 | mid->mid_flags |= MID_DELETED; | |
920 | } | |
afe6f653 | 921 | cifs_server_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
f96637be | 922 | __func__, mid->mid, mid->mid_state); |
74dd92a8 | 923 | rc = -EIO; |
053d5034 JL |
924 | } |
925 | spin_unlock(&GlobalMid_Lock); | |
926 | ||
2b84a36c | 927 | DeleteMidQEntry(mid); |
053d5034 JL |
928 | return rc; |
929 | } | |
930 | ||
121b046a | 931 | static inline int |
fb2036d8 PS |
932 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
933 | struct mid_q_entry *mid) | |
76dcc26f | 934 | { |
121b046a | 935 | return server->ops->send_cancel ? |
fb2036d8 | 936 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
937 | } |
938 | ||
2c8f981d JL |
939 | int |
940 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
941 | bool log_error) | |
942 | { | |
792af7b0 | 943 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
944 | |
945 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
946 | |
947 | /* convert the length into a more usable form */ | |
38d77c50 | 948 | if (server->sign) { |
738f9de5 | 949 | struct kvec iov[2]; |
985e4ff0 | 950 | int rc = 0; |
738f9de5 PS |
951 | struct smb_rqst rqst = { .rq_iov = iov, |
952 | .rq_nvec = 2 }; | |
826a95e4 | 953 | |
738f9de5 PS |
954 | iov[0].iov_base = mid->resp_buf; |
955 | iov[0].iov_len = 4; | |
956 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
957 | iov[1].iov_len = len - 4; | |
2c8f981d | 958 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 959 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 960 | mid->sequence_number); |
985e4ff0 | 961 | if (rc) |
afe6f653 | 962 | cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n", |
f96637be | 963 | rc); |
2c8f981d JL |
964 | } |
965 | ||
966 | /* BB special case reconnect tid and uid here? */ | |
a3713ec3 | 967 | return map_and_check_smb_error(mid, log_error); |
2c8f981d JL |
968 | } |
969 | ||
fec344e3 | 970 | struct mid_q_entry * |
f780bd3f AA |
971 | cifs_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *ignored, |
972 | struct smb_rqst *rqst) | |
792af7b0 PS |
973 | { |
974 | int rc; | |
fec344e3 | 975 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
976 | struct mid_q_entry *mid; |
977 | ||
738f9de5 PS |
978 | if (rqst->rq_iov[0].iov_len != 4 || |
979 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
980 | return ERR_PTR(-EIO); | |
981 | ||
792af7b0 PS |
982 | rc = allocate_mid(ses, hdr, &mid); |
983 | if (rc) | |
fec344e3 JL |
984 | return ERR_PTR(rc); |
985 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
986 | if (rc) { | |
3c1bf7e4 | 987 | cifs_delete_mid(mid); |
fec344e3 JL |
988 | return ERR_PTR(rc); |
989 | } | |
990 | return mid; | |
792af7b0 PS |
991 | } |
992 | ||
4e34feb5 | 993 | static void |
ee258d79 | 994 | cifs_compound_callback(struct mid_q_entry *mid) |
8a26f0f7 PS |
995 | { |
996 | struct TCP_Server_Info *server = mid->server; | |
34f4deb7 PS |
997 | struct cifs_credits credits; |
998 | ||
999 | credits.value = server->ops->get_credits(mid); | |
1000 | credits.instance = server->reconnect_instance; | |
8a26f0f7 | 1001 | |
34f4deb7 | 1002 | add_credits(server, &credits, mid->optype); |
8a26f0f7 PS |
1003 | } |
1004 | ||
ee258d79 PS |
1005 | static void |
1006 | cifs_compound_last_callback(struct mid_q_entry *mid) | |
1007 | { | |
1008 | cifs_compound_callback(mid); | |
1009 | cifs_wake_up_task(mid); | |
1010 | } | |
1011 | ||
1012 | static void | |
1013 | cifs_cancelled_callback(struct mid_q_entry *mid) | |
1014 | { | |
1015 | cifs_compound_callback(mid); | |
1016 | DeleteMidQEntry(mid); | |
1017 | } | |
1018 | ||
5f68ea4a AA |
1019 | /* |
1020 | * Return a channel (master if none) of @ses that can be used to send | |
1021 | * regular requests. | |
1022 | * | |
1023 | * If we are currently binding a new channel (negprot/sess.setup), | |
1024 | * return the new incomplete channel. | |
1025 | */ | |
1026 | struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses) | |
1027 | { | |
1028 | uint index = 0; | |
1029 | ||
1030 | if (!ses) | |
1031 | return NULL; | |
1032 | ||
1033 | if (!ses->binding) { | |
1034 | /* round robin */ | |
1035 | if (ses->chan_count > 1) { | |
1036 | index = (uint)atomic_inc_return(&ses->chan_seq); | |
1037 | index %= ses->chan_count; | |
1038 | } | |
1039 | return ses->chans[index].server; | |
1040 | } else { | |
1041 | return cifs_ses_server(ses); | |
1042 | } | |
1043 | } | |
1044 | ||
b8f57ee8 | 1045 | int |
e0bba0b8 | 1046 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
352d96f3 | 1047 | struct TCP_Server_Info *server, |
e0bba0b8 RS |
1048 | const int flags, const int num_rqst, struct smb_rqst *rqst, |
1049 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 1050 | { |
480b1cb9 | 1051 | int i, j, optype, rc = 0; |
e0bba0b8 | 1052 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
8544f4aa | 1053 | bool cancelled_mid[MAX_COMPOUND] = {false}; |
34f4deb7 PS |
1054 | struct cifs_credits credits[MAX_COMPOUND] = { |
1055 | { .value = 0, .instance = 0 } | |
1056 | }; | |
1057 | unsigned int instance; | |
738f9de5 | 1058 | char *buf; |
50c2f753 | 1059 | |
a891f0f8 | 1060 | optype = flags & CIFS_OP_MASK; |
133672ef | 1061 | |
e0bba0b8 RS |
1062 | for (i = 0; i < num_rqst; i++) |
1063 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 | 1064 | |
352d96f3 | 1065 | if (!ses || !ses->server || !server) { |
f96637be | 1066 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
1067 | return -EIO; |
1068 | } | |
1069 | ||
3190b59a | 1070 | if (server->tcpStatus == CifsExiting) |
7ee1af76 | 1071 | return -ENOENT; |
7ee1af76 | 1072 | |
792af7b0 | 1073 | /* |
257b7809 | 1074 | * Wait for all the requests to become available. |
7091bcab PS |
1075 | * This approach still leaves the possibility to be stuck waiting for |
1076 | * credits if the server doesn't grant credits to the outstanding | |
257b7809 RS |
1077 | * requests and if the client is completely idle, not generating any |
1078 | * other requests. | |
1079 | * This can be handled by the eventual session reconnect. | |
792af7b0 | 1080 | */ |
3190b59a | 1081 | rc = wait_for_compound_request(server, num_rqst, flags, |
257b7809 RS |
1082 | &instance); |
1083 | if (rc) | |
1084 | return rc; | |
97ea4998 | 1085 | |
257b7809 RS |
1086 | for (i = 0; i < num_rqst; i++) { |
1087 | credits[i].value = 1; | |
1088 | credits[i].instance = instance; | |
8544f4aa | 1089 | } |
7ee1af76 | 1090 | |
792af7b0 PS |
1091 | /* |
1092 | * Make sure that we sign in the same order that we send on this socket | |
1093 | * and avoid races inside tcp sendmsg code that could cause corruption | |
1094 | * of smb data. | |
1095 | */ | |
7ee1af76 | 1096 | |
3190b59a | 1097 | mutex_lock(&server->srv_mutex); |
7ee1af76 | 1098 | |
97ea4998 PS |
1099 | /* |
1100 | * All the parts of the compound chain belong obtained credits from the | |
257b7809 | 1101 | * same session. We can not use credits obtained from the previous |
97ea4998 PS |
1102 | * session to send this request. Check if there were reconnects after |
1103 | * we obtained credits and return -EAGAIN in such cases to let callers | |
1104 | * handle it. | |
1105 | */ | |
3190b59a AA |
1106 | if (instance != server->reconnect_instance) { |
1107 | mutex_unlock(&server->srv_mutex); | |
97ea4998 | 1108 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1109 | add_credits(server, &credits[j], optype); |
97ea4998 PS |
1110 | return -EAGAIN; |
1111 | } | |
1112 | ||
e0bba0b8 | 1113 | for (i = 0; i < num_rqst; i++) { |
f780bd3f | 1114 | midQ[i] = server->ops->setup_request(ses, server, &rqst[i]); |
e0bba0b8 | 1115 | if (IS_ERR(midQ[i])) { |
3190b59a | 1116 | revert_current_mid(server, i); |
e0bba0b8 RS |
1117 | for (j = 0; j < i; j++) |
1118 | cifs_delete_mid(midQ[j]); | |
3190b59a | 1119 | mutex_unlock(&server->srv_mutex); |
8544f4aa | 1120 | |
e0bba0b8 | 1121 | /* Update # of requests on wire to server */ |
8544f4aa | 1122 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1123 | add_credits(server, &credits[j], optype); |
e0bba0b8 RS |
1124 | return PTR_ERR(midQ[i]); |
1125 | } | |
1126 | ||
1127 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
8a26f0f7 | 1128 | midQ[i]->optype = optype; |
4e34feb5 | 1129 | /* |
ee258d79 PS |
1130 | * Invoke callback for every part of the compound chain |
1131 | * to calculate credits properly. Wake up this thread only when | |
1132 | * the last element is received. | |
4e34feb5 RS |
1133 | */ |
1134 | if (i < num_rqst - 1) | |
ee258d79 PS |
1135 | midQ[i]->callback = cifs_compound_callback; |
1136 | else | |
1137 | midQ[i]->callback = cifs_compound_last_callback; | |
1da177e4 | 1138 | } |
3190b59a AA |
1139 | cifs_in_send_inc(server); |
1140 | rc = smb_send_rqst(server, num_rqst, rqst, flags); | |
1141 | cifs_in_send_dec(server); | |
e0bba0b8 RS |
1142 | |
1143 | for (i = 0; i < num_rqst; i++) | |
1144 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 1145 | |
c781af7e | 1146 | if (rc < 0) { |
3190b59a AA |
1147 | revert_current_mid(server, num_rqst); |
1148 | server->sequence_number -= 2; | |
c781af7e | 1149 | } |
e0bba0b8 | 1150 | |
3190b59a | 1151 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1152 | |
d69cb728 RS |
1153 | /* |
1154 | * If sending failed for some reason or it is an oplock break that we | |
1155 | * will not receive a response to - return credits back | |
1156 | */ | |
1157 | if (rc < 0 || (flags & CIFS_NO_SRV_RSP)) { | |
ee258d79 | 1158 | for (i = 0; i < num_rqst; i++) |
3190b59a | 1159 | add_credits(server, &credits[i], optype); |
cb5c2e63 | 1160 | goto out; |
ee258d79 PS |
1161 | } |
1162 | ||
1163 | /* | |
1164 | * At this point the request is passed to the network stack - we assume | |
1165 | * that any credits taken from the server structure on the client have | |
1166 | * been spent and we can't return them back. Once we receive responses | |
1167 | * we will collect credits granted by the server in the mid callbacks | |
1168 | * and add those credits to the server structure. | |
1169 | */ | |
e0bba0b8 | 1170 | |
cb5c2e63 RS |
1171 | /* |
1172 | * Compounding is never used during session establish. | |
1173 | */ | |
0f56db83 | 1174 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP) || (optype & CIFS_SESS_OP)) |
cb5c2e63 RS |
1175 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, |
1176 | rqst[0].rq_nvec); | |
e0bba0b8 | 1177 | |
cb5c2e63 | 1178 | for (i = 0; i < num_rqst; i++) { |
3190b59a | 1179 | rc = wait_for_response(server, midQ[i]); |
8a26f0f7 PS |
1180 | if (rc != 0) |
1181 | break; | |
1182 | } | |
1183 | if (rc != 0) { | |
1184 | for (; i < num_rqst; i++) { | |
afe6f653 | 1185 | cifs_server_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", |
43de1db3 | 1186 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); |
3190b59a | 1187 | send_cancel(server, &rqst[i], midQ[i]); |
e0bba0b8 | 1188 | spin_lock(&GlobalMid_Lock); |
7b71843f | 1189 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; |
e0bba0b8 | 1190 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { |
8a26f0f7 | 1191 | midQ[i]->callback = cifs_cancelled_callback; |
8544f4aa | 1192 | cancelled_mid[i] = true; |
34f4deb7 | 1193 | credits[i].value = 0; |
e0bba0b8 | 1194 | } |
1be912dd | 1195 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 1196 | } |
cb5c2e63 RS |
1197 | } |
1198 | ||
cb5c2e63 RS |
1199 | for (i = 0; i < num_rqst; i++) { |
1200 | if (rc < 0) | |
1201 | goto out; | |
e0bba0b8 | 1202 | |
3190b59a | 1203 | rc = cifs_sync_mid_result(midQ[i], server); |
e0bba0b8 | 1204 | if (rc != 0) { |
8544f4aa PS |
1205 | /* mark this mid as cancelled to not free it below */ |
1206 | cancelled_mid[i] = true; | |
1207 | goto out; | |
1be912dd | 1208 | } |
2b2bdfba | 1209 | |
e0bba0b8 RS |
1210 | if (!midQ[i]->resp_buf || |
1211 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
1212 | rc = -EIO; | |
1213 | cifs_dbg(FYI, "Bad MID state?\n"); | |
1214 | goto out; | |
1215 | } | |
a891f0f8 | 1216 | |
e0bba0b8 RS |
1217 | buf = (char *)midQ[i]->resp_buf; |
1218 | resp_iov[i].iov_base = buf; | |
1219 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
3190b59a | 1220 | server->vals->header_preamble_size; |
e0bba0b8 RS |
1221 | |
1222 | if (midQ[i]->large_buf) | |
1223 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
1224 | else | |
1225 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
1226 | ||
3190b59a | 1227 | rc = server->ops->check_receive(midQ[i], server, |
e0bba0b8 | 1228 | flags & CIFS_LOG_ERROR); |
1da177e4 | 1229 | |
e0bba0b8 | 1230 | /* mark it so buf will not be freed by cifs_delete_mid */ |
392e1c5d | 1231 | if ((flags & CIFS_NO_RSP_BUF) == 0) |
e0bba0b8 | 1232 | midQ[i]->resp_buf = NULL; |
cb5c2e63 | 1233 | |
e0bba0b8 | 1234 | } |
cb5c2e63 RS |
1235 | |
1236 | /* | |
1237 | * Compounding is never used during session establish. | |
1238 | */ | |
0f56db83 | 1239 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP) || (optype & CIFS_SESS_OP)) { |
cb5c2e63 RS |
1240 | struct kvec iov = { |
1241 | .iov_base = resp_iov[0].iov_base, | |
1242 | .iov_len = resp_iov[0].iov_len | |
1243 | }; | |
1244 | smb311_update_preauth_hash(ses, &iov, 1); | |
1245 | } | |
1246 | ||
7ee1af76 | 1247 | out: |
4e34feb5 RS |
1248 | /* |
1249 | * This will dequeue all mids. After this it is important that the | |
1250 | * demultiplex_thread will not process any of these mids any futher. | |
1251 | * This is prevented above by using a noop callback that will not | |
1252 | * wake this thread except for the very last PDU. | |
1253 | */ | |
8544f4aa PS |
1254 | for (i = 0; i < num_rqst; i++) { |
1255 | if (!cancelled_mid[i]) | |
1256 | cifs_delete_mid(midQ[i]); | |
8544f4aa | 1257 | } |
1da177e4 | 1258 | |
d6e04ae6 SF |
1259 | return rc; |
1260 | } | |
1da177e4 | 1261 | |
e0bba0b8 RS |
1262 | int |
1263 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
352d96f3 | 1264 | struct TCP_Server_Info *server, |
e0bba0b8 RS |
1265 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, |
1266 | struct kvec *resp_iov) | |
1267 | { | |
352d96f3 AA |
1268 | return compound_send_recv(xid, ses, server, flags, 1, |
1269 | rqst, resp_buf_type, resp_iov); | |
e0bba0b8 RS |
1270 | } |
1271 | ||
738f9de5 PS |
1272 | int |
1273 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
1274 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
1275 | const int flags, struct kvec *resp_iov) | |
1276 | { | |
1277 | struct smb_rqst rqst; | |
3cecf486 | 1278 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
1279 | int rc; |
1280 | ||
3cecf486 | 1281 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
1282 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
1283 | GFP_KERNEL); | |
117e3b7f SF |
1284 | if (!new_iov) { |
1285 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
1286 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 1287 | return -ENOMEM; |
117e3b7f | 1288 | } |
3cecf486 RS |
1289 | } else |
1290 | new_iov = s_iov; | |
738f9de5 PS |
1291 | |
1292 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
1293 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
1294 | ||
1295 | new_iov[0].iov_base = new_iov[1].iov_base; | |
1296 | new_iov[0].iov_len = 4; | |
1297 | new_iov[1].iov_base += 4; | |
1298 | new_iov[1].iov_len -= 4; | |
1299 | ||
1300 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
1301 | rqst.rq_iov = new_iov; | |
1302 | rqst.rq_nvec = n_vec + 1; | |
1303 | ||
352d96f3 AA |
1304 | rc = cifs_send_recv(xid, ses, ses->server, |
1305 | &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1306 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1307 | kfree(new_iov); | |
738f9de5 PS |
1308 | return rc; |
1309 | } | |
1310 | ||
1da177e4 | 1311 | int |
96daf2b0 | 1312 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1313 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
480b1cb9 | 1314 | int *pbytes_returned, const int flags) |
1da177e4 LT |
1315 | { |
1316 | int rc = 0; | |
1da177e4 | 1317 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1318 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1319 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1320 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1321 | struct cifs_credits credits = { .value = 1, .instance = 0 }; |
ac6ad7a8 | 1322 | struct TCP_Server_Info *server; |
1da177e4 LT |
1323 | |
1324 | if (ses == NULL) { | |
f96637be | 1325 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1326 | return -EIO; |
1327 | } | |
ac6ad7a8 | 1328 | server = ses->server; |
afe6f653 | 1329 | if (server == NULL) { |
f96637be | 1330 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1331 | return -EIO; |
1332 | } | |
1333 | ||
afe6f653 | 1334 | if (server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1335 | return -ENOENT; |
1336 | ||
79a58d1f | 1337 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1338 | to the same server. We may make this configurable later or |
1339 | use ses->maxReq */ | |
1da177e4 | 1340 | |
fb2036d8 | 1341 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
a0a3036b JP |
1342 | cifs_server_dbg(VFS, "Invalid length, greater than maximum frame, %d\n", |
1343 | len); | |
6d9c6d54 VL |
1344 | return -EIO; |
1345 | } | |
1346 | ||
afe6f653 | 1347 | rc = wait_for_free_request(server, flags, &credits.instance); |
7ee1af76 JA |
1348 | if (rc) |
1349 | return rc; | |
1350 | ||
79a58d1f | 1351 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1352 | and avoid races inside tcp sendmsg code that could cause corruption |
1353 | of smb data */ | |
1354 | ||
afe6f653 | 1355 | mutex_lock(&server->srv_mutex); |
1da177e4 | 1356 | |
7ee1af76 JA |
1357 | rc = allocate_mid(ses, in_buf, &midQ); |
1358 | if (rc) { | |
8bd3754c | 1359 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1360 | /* Update # of requests on wire to server */ |
afe6f653 | 1361 | add_credits(server, &credits, 0); |
7ee1af76 | 1362 | return rc; |
1da177e4 LT |
1363 | } |
1364 | ||
afe6f653 | 1365 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1366 | if (rc) { |
afe6f653 | 1367 | mutex_unlock(&server->srv_mutex); |
829049cb VL |
1368 | goto out; |
1369 | } | |
1da177e4 | 1370 | |
7c9421e1 | 1371 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1372 | |
afe6f653 RS |
1373 | cifs_in_send_inc(server); |
1374 | rc = smb_send(server, in_buf, len); | |
1375 | cifs_in_send_dec(server); | |
789e6661 | 1376 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1377 | |
1378 | if (rc < 0) | |
afe6f653 | 1379 | server->sequence_number -= 2; |
ad313cb8 | 1380 | |
afe6f653 | 1381 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1382 | |
79a58d1f | 1383 | if (rc < 0) |
7ee1af76 JA |
1384 | goto out; |
1385 | ||
afe6f653 | 1386 | rc = wait_for_response(server, midQ); |
1be912dd | 1387 | if (rc != 0) { |
afe6f653 | 1388 | send_cancel(server, &rqst, midQ); |
1be912dd | 1389 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1390 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1391 | /* no longer considered to be "in-flight" */ |
1392 | midQ->callback = DeleteMidQEntry; | |
1393 | spin_unlock(&GlobalMid_Lock); | |
afe6f653 | 1394 | add_credits(server, &credits, 0); |
1be912dd JL |
1395 | return rc; |
1396 | } | |
1397 | spin_unlock(&GlobalMid_Lock); | |
1398 | } | |
1da177e4 | 1399 | |
afe6f653 | 1400 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1401 | if (rc != 0) { |
afe6f653 | 1402 | add_credits(server, &credits, 0); |
1da177e4 LT |
1403 | return rc; |
1404 | } | |
50c2f753 | 1405 | |
2c8f981d | 1406 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1407 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1408 | rc = -EIO; |
afe6f653 | 1409 | cifs_server_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1410 | goto out; |
1da177e4 | 1411 | } |
7ee1af76 | 1412 | |
d4e4854f | 1413 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1414 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1415 | rc = cifs_check_receive(midQ, server, 0); |
7ee1af76 | 1416 | out: |
3c1bf7e4 | 1417 | cifs_delete_mid(midQ); |
afe6f653 | 1418 | add_credits(server, &credits, 0); |
1da177e4 | 1419 | |
7ee1af76 JA |
1420 | return rc; |
1421 | } | |
1da177e4 | 1422 | |
7ee1af76 JA |
1423 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1424 | blocking lock to return. */ | |
1425 | ||
1426 | static int | |
96daf2b0 | 1427 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1428 | struct smb_hdr *in_buf, |
1429 | struct smb_hdr *out_buf) | |
1430 | { | |
1431 | int bytes_returned; | |
96daf2b0 | 1432 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1433 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1434 | ||
1435 | /* We just modify the current in_buf to change | |
1436 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1437 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1438 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1439 | ||
1440 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1441 | pSMB->Timeout = 0; | |
88257360 | 1442 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1443 | |
1444 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1445 | &bytes_returned, 0); |
7ee1af76 JA |
1446 | } |
1447 | ||
1448 | int | |
96daf2b0 | 1449 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1450 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1451 | int *pbytes_returned) | |
1452 | { | |
1453 | int rc = 0; | |
1454 | int rstart = 0; | |
7ee1af76 | 1455 | struct mid_q_entry *midQ; |
96daf2b0 | 1456 | struct cifs_ses *ses; |
fb2036d8 PS |
1457 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1458 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1459 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1460 | unsigned int instance; |
afe6f653 | 1461 | struct TCP_Server_Info *server; |
7ee1af76 JA |
1462 | |
1463 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1464 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1465 | return -EIO; |
1466 | } | |
1467 | ses = tcon->ses; | |
afe6f653 | 1468 | server = ses->server; |
7ee1af76 | 1469 | |
afe6f653 | 1470 | if (server == NULL) { |
f96637be | 1471 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1472 | return -EIO; |
1473 | } | |
1474 | ||
afe6f653 | 1475 | if (server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1476 | return -ENOENT; |
1477 | ||
79a58d1f | 1478 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1479 | to the same server. We may make this configurable later or |
1480 | use ses->maxReq */ | |
1481 | ||
fb2036d8 | 1482 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
a0a3036b JP |
1483 | cifs_tcon_dbg(VFS, "Invalid length, greater than maximum frame, %d\n", |
1484 | len); | |
6d9c6d54 VL |
1485 | return -EIO; |
1486 | } | |
1487 | ||
afe6f653 | 1488 | rc = wait_for_free_request(server, CIFS_BLOCKING_OP, &instance); |
7ee1af76 JA |
1489 | if (rc) |
1490 | return rc; | |
1491 | ||
79a58d1f | 1492 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1493 | and avoid races inside tcp sendmsg code that could cause corruption |
1494 | of smb data */ | |
1495 | ||
afe6f653 | 1496 | mutex_lock(&server->srv_mutex); |
7ee1af76 JA |
1497 | |
1498 | rc = allocate_mid(ses, in_buf, &midQ); | |
1499 | if (rc) { | |
afe6f653 | 1500 | mutex_unlock(&server->srv_mutex); |
7ee1af76 JA |
1501 | return rc; |
1502 | } | |
1503 | ||
afe6f653 | 1504 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1505 | if (rc) { |
3c1bf7e4 | 1506 | cifs_delete_mid(midQ); |
afe6f653 | 1507 | mutex_unlock(&server->srv_mutex); |
829049cb VL |
1508 | return rc; |
1509 | } | |
1da177e4 | 1510 | |
7c9421e1 | 1511 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
afe6f653 RS |
1512 | cifs_in_send_inc(server); |
1513 | rc = smb_send(server, in_buf, len); | |
1514 | cifs_in_send_dec(server); | |
789e6661 | 1515 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1516 | |
1517 | if (rc < 0) | |
afe6f653 | 1518 | server->sequence_number -= 2; |
ad313cb8 | 1519 | |
afe6f653 | 1520 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1521 | |
79a58d1f | 1522 | if (rc < 0) { |
3c1bf7e4 | 1523 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1524 | return rc; |
1525 | } | |
1526 | ||
1527 | /* Wait for a reply - allow signals to interrupt. */ | |
afe6f653 | 1528 | rc = wait_event_interruptible(server->response_q, |
7c9421e1 | 1529 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
afe6f653 RS |
1530 | ((server->tcpStatus != CifsGood) && |
1531 | (server->tcpStatus != CifsNew))); | |
7ee1af76 JA |
1532 | |
1533 | /* Were we interrupted by a signal ? */ | |
1534 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1535 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
afe6f653 RS |
1536 | ((server->tcpStatus == CifsGood) || |
1537 | (server->tcpStatus == CifsNew))) { | |
7ee1af76 JA |
1538 | |
1539 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1540 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1541 | blocking lock to return. */ | |
afe6f653 | 1542 | rc = send_cancel(server, &rqst, midQ); |
7ee1af76 | 1543 | if (rc) { |
3c1bf7e4 | 1544 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1545 | return rc; |
1546 | } | |
1547 | } else { | |
1548 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1549 | to cause the blocking lock to return. */ | |
1550 | ||
1551 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1552 | ||
1553 | /* If we get -ENOLCK back the lock may have | |
1554 | already been removed. Don't exit in this case. */ | |
1555 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1556 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1557 | return rc; |
1558 | } | |
1559 | } | |
1560 | ||
afe6f653 | 1561 | rc = wait_for_response(server, midQ); |
1be912dd | 1562 | if (rc) { |
afe6f653 | 1563 | send_cancel(server, &rqst, midQ); |
1be912dd | 1564 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1565 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1566 | /* no longer considered to be "in-flight" */ |
1567 | midQ->callback = DeleteMidQEntry; | |
1568 | spin_unlock(&GlobalMid_Lock); | |
1569 | return rc; | |
1570 | } | |
1571 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1572 | } |
1be912dd JL |
1573 | |
1574 | /* We got the response - restart system call. */ | |
1575 | rstart = 1; | |
7ee1af76 JA |
1576 | } |
1577 | ||
afe6f653 | 1578 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1579 | if (rc != 0) |
7ee1af76 | 1580 | return rc; |
50c2f753 | 1581 | |
17c8bfed | 1582 | /* rcvd frame is ok */ |
7c9421e1 | 1583 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1584 | rc = -EIO; |
3175eb9b | 1585 | cifs_tcon_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1586 | goto out; |
1587 | } | |
1da177e4 | 1588 | |
d4e4854f | 1589 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1590 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1591 | rc = cifs_check_receive(midQ, server, 0); |
17c8bfed | 1592 | out: |
3c1bf7e4 | 1593 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1594 | if (rstart && rc == -EACCES) |
1595 | return -ERESTARTSYS; | |
1da177e4 LT |
1596 | return rc; |
1597 | } |