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; |
b8eed283 | 328 | int val = 1; |
c713c877 RS |
329 | __be32 rfc1002_marker; |
330 | ||
4357d45f LL |
331 | if (cifs_rdma_enabled(server)) { |
332 | /* return -EAGAIN when connecting or reconnecting */ | |
333 | rc = -EAGAIN; | |
334 | if (server->smbd_conn) | |
335 | rc = smbd_send(server, num_rqst, rqst); | |
9762c2d0 LL |
336 | goto smbd_done; |
337 | } | |
afc18a6f | 338 | |
ea702b80 | 339 | if (ssocket == NULL) |
afc18a6f | 340 | return -EAGAIN; |
ea702b80 | 341 | |
b30c74c7 PS |
342 | if (signal_pending(current)) { |
343 | cifs_dbg(FYI, "signal is pending before sending any data\n"); | |
344 | return -EINTR; | |
345 | } | |
346 | ||
b8eed283 JL |
347 | /* cork the socket */ |
348 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
349 | (char *)&val, sizeof(val)); | |
350 | ||
07cd952f | 351 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 352 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
353 | rfc1002_marker = cpu_to_be32(send_length); |
354 | ||
b30c74c7 PS |
355 | /* |
356 | * We should not allow signals to interrupt the network send because | |
357 | * any partial send will cause session reconnects thus increasing | |
358 | * latency of system calls and overload a server with unnecessary | |
359 | * requests. | |
360 | */ | |
361 | ||
362 | sigfillset(&mask); | |
363 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
364 | ||
c713c877 RS |
365 | /* Generate a rfc1002 marker for SMB2+ */ |
366 | if (server->vals->header_preamble_size == 0) { | |
367 | struct kvec hiov = { | |
368 | .iov_base = &rfc1002_marker, | |
369 | .iov_len = 4 | |
370 | }; | |
aa563d7b | 371 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
372 | rc = smb_send_kvec(server, &smb_msg, &sent); |
373 | if (rc < 0) | |
b30c74c7 | 374 | goto unmask; |
c713c877 RS |
375 | |
376 | total_len += sent; | |
377 | send_length += 4; | |
378 | } | |
379 | ||
662bf5bc PA |
380 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
381 | ||
07cd952f RS |
382 | for (j = 0; j < num_rqst; j++) { |
383 | iov = rqst[j].rq_iov; | |
384 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 385 | |
07cd952f | 386 | size = 0; |
662bf5bc PA |
387 | for (i = 0; i < n_vec; i++) { |
388 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 389 | size += iov[i].iov_len; |
662bf5bc | 390 | } |
97bc00b3 | 391 | |
aa563d7b | 392 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 393 | |
3ab3f2a1 | 394 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 395 | if (rc < 0) |
b30c74c7 | 396 | goto unmask; |
97bc00b3 JL |
397 | |
398 | total_len += sent; | |
07cd952f RS |
399 | |
400 | /* now walk the page array and send each page in it */ | |
401 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
402 | struct bio_vec bvec; | |
403 | ||
404 | bvec.bv_page = rqst[j].rq_pages[i]; | |
405 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
406 | &bvec.bv_offset); | |
407 | ||
aa563d7b | 408 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
409 | &bvec, 1, bvec.bv_len); |
410 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
411 | if (rc < 0) | |
412 | break; | |
413 | ||
414 | total_len += sent; | |
415 | } | |
97bc00b3 | 416 | } |
1da177e4 | 417 | |
b30c74c7 PS |
418 | unmask: |
419 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
420 | ||
421 | /* | |
422 | * If signal is pending but we have already sent the whole packet to | |
423 | * the server we need to return success status to allow a corresponding | |
424 | * mid entry to be kept in the pending requests queue thus allowing | |
425 | * to handle responses from the server by the client. | |
426 | * | |
427 | * If only part of the packet has been sent there is no need to hide | |
428 | * interrupt because the session will be reconnected anyway, so there | |
429 | * won't be any response from the server to handle. | |
430 | */ | |
431 | ||
432 | if (signal_pending(current) && (total_len != send_length)) { | |
433 | cifs_dbg(FYI, "signal is pending after attempt to send\n"); | |
434 | rc = -EINTR; | |
435 | } | |
436 | ||
b8eed283 JL |
437 | /* uncork it */ |
438 | val = 0; | |
439 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
440 | (char *)&val, sizeof(val)); | |
441 | ||
c713c877 | 442 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 443 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 444 | send_length, total_len); |
6f49f46b JL |
445 | /* |
446 | * If we have only sent part of an SMB then the next SMB could | |
447 | * be taken as the remainder of this one. We need to kill the | |
448 | * socket so the server throws away the partial SMB | |
449 | */ | |
edf1ae40 | 450 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
451 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
452 | server->hostname); | |
edf1ae40 | 453 | } |
9762c2d0 | 454 | smbd_done: |
d804d41d | 455 | if (rc < 0 && rc != -EINTR) |
afe6f653 | 456 | cifs_server_dbg(VFS, "Error %d sending data on socket to server\n", |
f96637be | 457 | rc); |
ee13919c | 458 | else if (rc > 0) |
1da177e4 | 459 | rc = 0; |
1da177e4 LT |
460 | |
461 | return rc; | |
462 | } | |
463 | ||
6f49f46b | 464 | static int |
1f3a8f5f RS |
465 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
466 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 467 | { |
b2c96de7 | 468 | struct kvec iov; |
3946d0d0 | 469 | struct smb2_transform_hdr *tr_hdr; |
b2c96de7 | 470 | struct smb_rqst cur_rqst[MAX_COMPOUND]; |
7fb8986e PS |
471 | int rc; |
472 | ||
473 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
474 | return __smb_send_rqst(server, num_rqst, rqst); |
475 | ||
476 | if (num_rqst > MAX_COMPOUND - 1) | |
477 | return -ENOMEM; | |
7fb8986e | 478 | |
b2c96de7 | 479 | if (!server->ops->init_transform_rq) { |
a0a3036b | 480 | cifs_server_dbg(VFS, "Encryption requested but transform callback is missing\n"); |
7fb8986e PS |
481 | return -EIO; |
482 | } | |
6f49f46b | 483 | |
3946d0d0 LL |
484 | tr_hdr = kmalloc(sizeof(*tr_hdr), GFP_NOFS); |
485 | if (!tr_hdr) | |
486 | return -ENOMEM; | |
487 | ||
488 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); | |
489 | memset(&iov, 0, sizeof(iov)); | |
490 | memset(tr_hdr, 0, sizeof(*tr_hdr)); | |
491 | ||
492 | iov.iov_base = tr_hdr; | |
493 | iov.iov_len = sizeof(*tr_hdr); | |
494 | cur_rqst[0].rq_iov = &iov; | |
495 | cur_rqst[0].rq_nvec = 1; | |
496 | ||
1f3a8f5f RS |
497 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
498 | &cur_rqst[0], rqst); | |
7fb8986e | 499 | if (rc) |
3946d0d0 | 500 | goto out; |
7fb8986e | 501 | |
1f3a8f5f RS |
502 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
503 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
3946d0d0 LL |
504 | out: |
505 | kfree(tr_hdr); | |
7fb8986e | 506 | return rc; |
6f49f46b JL |
507 | } |
508 | ||
0496e02d JL |
509 | int |
510 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
511 | unsigned int smb_buf_length) | |
512 | { | |
738f9de5 | 513 | struct kvec iov[2]; |
7fb8986e PS |
514 | struct smb_rqst rqst = { .rq_iov = iov, |
515 | .rq_nvec = 2 }; | |
0496e02d | 516 | |
738f9de5 PS |
517 | iov[0].iov_base = smb_buffer; |
518 | iov[0].iov_len = 4; | |
519 | iov[1].iov_base = (char *)smb_buffer + 4; | |
520 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 521 | |
07cd952f | 522 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
523 | } |
524 | ||
fc40f9cf | 525 | static int |
b227d215 | 526 | wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits, |
2b53b929 RS |
527 | const int timeout, const int flags, |
528 | unsigned int *instance) | |
1da177e4 | 529 | { |
5bc59498 | 530 | int rc; |
4230cff8 RS |
531 | int *credits; |
532 | int optype; | |
2b53b929 RS |
533 | long int t; |
534 | ||
535 | if (timeout < 0) | |
536 | t = MAX_JIFFY_OFFSET; | |
537 | else | |
538 | t = msecs_to_jiffies(timeout); | |
4230cff8 RS |
539 | |
540 | optype = flags & CIFS_OP_MASK; | |
5bc59498 | 541 | |
34f4deb7 PS |
542 | *instance = 0; |
543 | ||
4230cff8 RS |
544 | credits = server->ops->get_credits_field(server, optype); |
545 | /* Since an echo is already inflight, no need to wait to send another */ | |
546 | if (*credits <= 0 && optype == CIFS_ECHO_OP) | |
547 | return -EAGAIN; | |
548 | ||
fc40f9cf | 549 | spin_lock(&server->req_lock); |
392e1c5d | 550 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) { |
1da177e4 | 551 | /* oplock breaks must not be held up */ |
fc40f9cf | 552 | server->in_flight++; |
1b63f184 SF |
553 | if (server->in_flight > server->max_in_flight) |
554 | server->max_in_flight = server->in_flight; | |
bc205ed1 | 555 | *credits -= 1; |
34f4deb7 | 556 | *instance = server->reconnect_instance; |
fc40f9cf | 557 | spin_unlock(&server->req_lock); |
27a97a61 VL |
558 | return 0; |
559 | } | |
560 | ||
27a97a61 | 561 | while (1) { |
b227d215 | 562 | if (*credits < num_credits) { |
fc40f9cf | 563 | spin_unlock(&server->req_lock); |
789e6661 | 564 | cifs_num_waiters_inc(server); |
2b53b929 RS |
565 | rc = wait_event_killable_timeout(server->request_q, |
566 | has_credits(server, credits, num_credits), t); | |
789e6661 | 567 | cifs_num_waiters_dec(server); |
2b53b929 | 568 | if (!rc) { |
7937ca96 SF |
569 | trace_smb3_credit_timeout(server->CurrentMid, |
570 | server->hostname, num_credits); | |
afe6f653 | 571 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
2b53b929 RS |
572 | timeout); |
573 | return -ENOTSUPP; | |
574 | } | |
575 | if (rc == -ERESTARTSYS) | |
576 | return -ERESTARTSYS; | |
fc40f9cf | 577 | spin_lock(&server->req_lock); |
27a97a61 | 578 | } else { |
c5797a94 | 579 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 580 | spin_unlock(&server->req_lock); |
27a97a61 | 581 | return -ENOENT; |
1da177e4 | 582 | } |
27a97a61 | 583 | |
16b34aa4 RS |
584 | /* |
585 | * For normal commands, reserve the last MAX_COMPOUND | |
586 | * credits to compound requests. | |
587 | * Otherwise these compounds could be permanently | |
588 | * starved for credits by single-credit requests. | |
589 | * | |
590 | * To prevent spinning CPU, block this thread until | |
591 | * there are >MAX_COMPOUND credits available. | |
592 | * But only do this is we already have a lot of | |
593 | * credits in flight to avoid triggering this check | |
594 | * for servers that are slow to hand out credits on | |
595 | * new sessions. | |
596 | */ | |
597 | if (!optype && num_credits == 1 && | |
598 | server->in_flight > 2 * MAX_COMPOUND && | |
599 | *credits <= MAX_COMPOUND) { | |
600 | spin_unlock(&server->req_lock); | |
601 | cifs_num_waiters_inc(server); | |
2b53b929 RS |
602 | rc = wait_event_killable_timeout( |
603 | server->request_q, | |
16b34aa4 | 604 | has_credits(server, credits, |
2b53b929 RS |
605 | MAX_COMPOUND + 1), |
606 | t); | |
16b34aa4 | 607 | cifs_num_waiters_dec(server); |
2b53b929 | 608 | if (!rc) { |
7937ca96 SF |
609 | trace_smb3_credit_timeout( |
610 | server->CurrentMid, | |
611 | server->hostname, num_credits); | |
afe6f653 | 612 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
2b53b929 RS |
613 | timeout); |
614 | return -ENOTSUPP; | |
615 | } | |
616 | if (rc == -ERESTARTSYS) | |
617 | return -ERESTARTSYS; | |
16b34aa4 RS |
618 | spin_lock(&server->req_lock); |
619 | continue; | |
620 | } | |
621 | ||
2d86dbc9 PS |
622 | /* |
623 | * Can not count locking commands against total | |
624 | * as they are allowed to block on server. | |
625 | */ | |
27a97a61 VL |
626 | |
627 | /* update # of requests on the wire to server */ | |
4230cff8 | 628 | if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) { |
b227d215 RS |
629 | *credits -= num_credits; |
630 | server->in_flight += num_credits; | |
1b63f184 SF |
631 | if (server->in_flight > server->max_in_flight) |
632 | server->max_in_flight = server->in_flight; | |
34f4deb7 | 633 | *instance = server->reconnect_instance; |
2d86dbc9 | 634 | } |
fc40f9cf | 635 | spin_unlock(&server->req_lock); |
27a97a61 | 636 | break; |
1da177e4 LT |
637 | } |
638 | } | |
7ee1af76 JA |
639 | return 0; |
640 | } | |
1da177e4 | 641 | |
bc205ed1 | 642 | static int |
480b1cb9 RS |
643 | wait_for_free_request(struct TCP_Server_Info *server, const int flags, |
644 | unsigned int *instance) | |
bc205ed1 | 645 | { |
2b53b929 RS |
646 | return wait_for_free_credits(server, 1, -1, flags, |
647 | instance); | |
bc205ed1 PS |
648 | } |
649 | ||
257b7809 RS |
650 | static int |
651 | wait_for_compound_request(struct TCP_Server_Info *server, int num, | |
652 | const int flags, unsigned int *instance) | |
653 | { | |
654 | int *credits; | |
655 | ||
656 | credits = server->ops->get_credits_field(server, flags & CIFS_OP_MASK); | |
657 | ||
658 | spin_lock(&server->req_lock); | |
659 | if (*credits < num) { | |
660 | /* | |
661 | * Return immediately if not too many requests in flight since | |
662 | * we will likely be stuck on waiting for credits. | |
663 | */ | |
664 | if (server->in_flight < num - *credits) { | |
665 | spin_unlock(&server->req_lock); | |
666 | return -ENOTSUPP; | |
667 | } | |
668 | } | |
669 | spin_unlock(&server->req_lock); | |
670 | ||
671 | return wait_for_free_credits(server, num, 60000, flags, | |
672 | instance); | |
673 | } | |
674 | ||
cb7e9eab PS |
675 | int |
676 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
335b7b62 | 677 | unsigned int *num, struct cifs_credits *credits) |
cb7e9eab PS |
678 | { |
679 | *num = size; | |
335b7b62 PS |
680 | credits->value = 0; |
681 | credits->instance = server->reconnect_instance; | |
cb7e9eab PS |
682 | return 0; |
683 | } | |
684 | ||
96daf2b0 | 685 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
686 | struct mid_q_entry **ppmidQ) |
687 | { | |
1da177e4 | 688 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 689 | return -ENOENT; |
8fbbd365 VL |
690 | } |
691 | ||
692 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 693 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 694 | return -EAGAIN; |
8fbbd365 VL |
695 | } |
696 | ||
7f48558e | 697 | if (ses->status == CifsNew) { |
79a58d1f | 698 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 699 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 700 | return -EAGAIN; |
ad7a2926 | 701 | /* else ok - we are setting up session */ |
1da177e4 | 702 | } |
7f48558e SP |
703 | |
704 | if (ses->status == CifsExiting) { | |
705 | /* check if SMB session is bad because we are setting it up */ | |
706 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
707 | return -EAGAIN; | |
708 | /* else ok - we are shutting down session */ | |
709 | } | |
710 | ||
24b9b06b | 711 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 712 | if (*ppmidQ == NULL) |
7ee1af76 | 713 | return -ENOMEM; |
ddc8cf8f JL |
714 | spin_lock(&GlobalMid_Lock); |
715 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
716 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
717 | return 0; |
718 | } | |
719 | ||
0ade640e JL |
720 | static int |
721 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 722 | { |
0ade640e | 723 | int error; |
7ee1af76 | 724 | |
5853cc2a | 725 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 726 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
727 | if (error < 0) |
728 | return -ERESTARTSYS; | |
7ee1af76 | 729 | |
0ade640e | 730 | return 0; |
7ee1af76 JA |
731 | } |
732 | ||
fec344e3 JL |
733 | struct mid_q_entry * |
734 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
735 | { |
736 | int rc; | |
fec344e3 | 737 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
738 | struct mid_q_entry *mid; |
739 | ||
738f9de5 PS |
740 | if (rqst->rq_iov[0].iov_len != 4 || |
741 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
742 | return ERR_PTR(-EIO); | |
743 | ||
792af7b0 | 744 | /* enable signing if server requires it */ |
38d77c50 | 745 | if (server->sign) |
792af7b0 PS |
746 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
747 | ||
748 | mid = AllocMidQEntry(hdr, server); | |
749 | if (mid == NULL) | |
fec344e3 | 750 | return ERR_PTR(-ENOMEM); |
792af7b0 | 751 | |
fec344e3 | 752 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
753 | if (rc) { |
754 | DeleteMidQEntry(mid); | |
fec344e3 | 755 | return ERR_PTR(rc); |
ffc61ccb SP |
756 | } |
757 | ||
fec344e3 | 758 | return mid; |
792af7b0 | 759 | } |
133672ef | 760 | |
a6827c18 JL |
761 | /* |
762 | * Send a SMB request and set the callback function in the mid to handle | |
763 | * the result. Caller is responsible for dealing with timeouts. | |
764 | */ | |
765 | int | |
fec344e3 | 766 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 | 767 | mid_receive_t *receive, mid_callback_t *callback, |
3349c3a7 PS |
768 | mid_handle_t *handle, void *cbdata, const int flags, |
769 | const struct cifs_credits *exist_credits) | |
a6827c18 | 770 | { |
480b1cb9 | 771 | int rc; |
a6827c18 | 772 | struct mid_q_entry *mid; |
335b7b62 | 773 | struct cifs_credits credits = { .value = 0, .instance = 0 }; |
34f4deb7 | 774 | unsigned int instance; |
480b1cb9 | 775 | int optype; |
a6827c18 | 776 | |
a891f0f8 PS |
777 | optype = flags & CIFS_OP_MASK; |
778 | ||
cb7e9eab | 779 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
480b1cb9 | 780 | rc = wait_for_free_request(server, flags, &instance); |
cb7e9eab PS |
781 | if (rc) |
782 | return rc; | |
335b7b62 | 783 | credits.value = 1; |
34f4deb7 | 784 | credits.instance = instance; |
3349c3a7 PS |
785 | } else |
786 | instance = exist_credits->instance; | |
a6827c18 JL |
787 | |
788 | mutex_lock(&server->srv_mutex); | |
3349c3a7 PS |
789 | |
790 | /* | |
791 | * We can't use credits obtained from the previous session to send this | |
792 | * request. Check if there were reconnects after we obtained credits and | |
793 | * return -EAGAIN in such cases to let callers handle it. | |
794 | */ | |
795 | if (instance != server->reconnect_instance) { | |
796 | mutex_unlock(&server->srv_mutex); | |
797 | add_credits_and_wake_if(server, &credits, optype); | |
798 | return -EAGAIN; | |
799 | } | |
800 | ||
fec344e3 JL |
801 | mid = server->ops->setup_async_request(server, rqst); |
802 | if (IS_ERR(mid)) { | |
a6827c18 | 803 | mutex_unlock(&server->srv_mutex); |
335b7b62 | 804 | add_credits_and_wake_if(server, &credits, optype); |
fec344e3 | 805 | return PTR_ERR(mid); |
a6827c18 JL |
806 | } |
807 | ||
44d22d84 | 808 | mid->receive = receive; |
a6827c18 JL |
809 | mid->callback = callback; |
810 | mid->callback_data = cbdata; | |
9b7c18a2 | 811 | mid->handle = handle; |
7c9421e1 | 812 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 813 | |
ffc61ccb SP |
814 | /* put it on the pending_mid_q */ |
815 | spin_lock(&GlobalMid_Lock); | |
816 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
817 | spin_unlock(&GlobalMid_Lock); | |
818 | ||
93d2cb6c LL |
819 | /* |
820 | * Need to store the time in mid before calling I/O. For call_async, | |
821 | * I/O response may come back and free the mid entry on another thread. | |
822 | */ | |
823 | cifs_save_when_sent(mid); | |
789e6661 | 824 | cifs_in_send_inc(server); |
1f3a8f5f | 825 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 826 | cifs_in_send_dec(server); |
ad313cb8 | 827 | |
820962dc | 828 | if (rc < 0) { |
c781af7e | 829 | revert_current_mid(server, mid->credits); |
ad313cb8 | 830 | server->sequence_number -= 2; |
820962dc RV |
831 | cifs_delete_mid(mid); |
832 | } | |
833 | ||
a6827c18 | 834 | mutex_unlock(&server->srv_mutex); |
789e6661 | 835 | |
ffc61ccb SP |
836 | if (rc == 0) |
837 | return 0; | |
a6827c18 | 838 | |
335b7b62 | 839 | add_credits_and_wake_if(server, &credits, optype); |
a6827c18 JL |
840 | return rc; |
841 | } | |
842 | ||
133672ef SF |
843 | /* |
844 | * | |
845 | * Send an SMB Request. No response info (other than return code) | |
846 | * needs to be parsed. | |
847 | * | |
848 | * flags indicate the type of request buffer and how long to wait | |
849 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
850 | * | |
851 | */ | |
852 | int | |
96daf2b0 | 853 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 854 | char *in_buf, int flags) |
133672ef SF |
855 | { |
856 | int rc; | |
857 | struct kvec iov[1]; | |
da502f7d | 858 | struct kvec rsp_iov; |
133672ef SF |
859 | int resp_buf_type; |
860 | ||
792af7b0 PS |
861 | iov[0].iov_base = in_buf; |
862 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
392e1c5d | 863 | flags |= CIFS_NO_RSP_BUF; |
da502f7d | 864 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 865 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 866 | |
133672ef SF |
867 | return rc; |
868 | } | |
869 | ||
053d5034 | 870 | static int |
3c1105df | 871 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
872 | { |
873 | int rc = 0; | |
874 | ||
f96637be JP |
875 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
876 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 877 | |
74dd92a8 | 878 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 879 | switch (mid->mid_state) { |
74dd92a8 | 880 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
881 | spin_unlock(&GlobalMid_Lock); |
882 | return rc; | |
74dd92a8 JL |
883 | case MID_RETRY_NEEDED: |
884 | rc = -EAGAIN; | |
885 | break; | |
71823baf JL |
886 | case MID_RESPONSE_MALFORMED: |
887 | rc = -EIO; | |
888 | break; | |
3c1105df JL |
889 | case MID_SHUTDOWN: |
890 | rc = -EHOSTDOWN; | |
891 | break; | |
74dd92a8 | 892 | default: |
abe57073 PS |
893 | if (!(mid->mid_flags & MID_DELETED)) { |
894 | list_del_init(&mid->qhead); | |
895 | mid->mid_flags |= MID_DELETED; | |
896 | } | |
afe6f653 | 897 | cifs_server_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
f96637be | 898 | __func__, mid->mid, mid->mid_state); |
74dd92a8 | 899 | rc = -EIO; |
053d5034 JL |
900 | } |
901 | spin_unlock(&GlobalMid_Lock); | |
902 | ||
2b84a36c | 903 | DeleteMidQEntry(mid); |
053d5034 JL |
904 | return rc; |
905 | } | |
906 | ||
121b046a | 907 | static inline int |
fb2036d8 PS |
908 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
909 | struct mid_q_entry *mid) | |
76dcc26f | 910 | { |
121b046a | 911 | return server->ops->send_cancel ? |
fb2036d8 | 912 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
913 | } |
914 | ||
2c8f981d JL |
915 | int |
916 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
917 | bool log_error) | |
918 | { | |
792af7b0 | 919 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
920 | |
921 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
922 | |
923 | /* convert the length into a more usable form */ | |
38d77c50 | 924 | if (server->sign) { |
738f9de5 | 925 | struct kvec iov[2]; |
985e4ff0 | 926 | int rc = 0; |
738f9de5 PS |
927 | struct smb_rqst rqst = { .rq_iov = iov, |
928 | .rq_nvec = 2 }; | |
826a95e4 | 929 | |
738f9de5 PS |
930 | iov[0].iov_base = mid->resp_buf; |
931 | iov[0].iov_len = 4; | |
932 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
933 | iov[1].iov_len = len - 4; | |
2c8f981d | 934 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 935 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 936 | mid->sequence_number); |
985e4ff0 | 937 | if (rc) |
afe6f653 | 938 | cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n", |
f96637be | 939 | rc); |
2c8f981d JL |
940 | } |
941 | ||
942 | /* BB special case reconnect tid and uid here? */ | |
943 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
944 | } | |
945 | ||
fec344e3 | 946 | struct mid_q_entry * |
f780bd3f AA |
947 | cifs_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *ignored, |
948 | struct smb_rqst *rqst) | |
792af7b0 PS |
949 | { |
950 | int rc; | |
fec344e3 | 951 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
952 | struct mid_q_entry *mid; |
953 | ||
738f9de5 PS |
954 | if (rqst->rq_iov[0].iov_len != 4 || |
955 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
956 | return ERR_PTR(-EIO); | |
957 | ||
792af7b0 PS |
958 | rc = allocate_mid(ses, hdr, &mid); |
959 | if (rc) | |
fec344e3 JL |
960 | return ERR_PTR(rc); |
961 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
962 | if (rc) { | |
3c1bf7e4 | 963 | cifs_delete_mid(mid); |
fec344e3 JL |
964 | return ERR_PTR(rc); |
965 | } | |
966 | return mid; | |
792af7b0 PS |
967 | } |
968 | ||
4e34feb5 | 969 | static void |
ee258d79 | 970 | cifs_compound_callback(struct mid_q_entry *mid) |
8a26f0f7 PS |
971 | { |
972 | struct TCP_Server_Info *server = mid->server; | |
34f4deb7 PS |
973 | struct cifs_credits credits; |
974 | ||
975 | credits.value = server->ops->get_credits(mid); | |
976 | credits.instance = server->reconnect_instance; | |
8a26f0f7 | 977 | |
34f4deb7 | 978 | add_credits(server, &credits, mid->optype); |
8a26f0f7 PS |
979 | } |
980 | ||
ee258d79 PS |
981 | static void |
982 | cifs_compound_last_callback(struct mid_q_entry *mid) | |
983 | { | |
984 | cifs_compound_callback(mid); | |
985 | cifs_wake_up_task(mid); | |
986 | } | |
987 | ||
988 | static void | |
989 | cifs_cancelled_callback(struct mid_q_entry *mid) | |
990 | { | |
991 | cifs_compound_callback(mid); | |
992 | DeleteMidQEntry(mid); | |
993 | } | |
994 | ||
5f68ea4a AA |
995 | /* |
996 | * Return a channel (master if none) of @ses that can be used to send | |
997 | * regular requests. | |
998 | * | |
999 | * If we are currently binding a new channel (negprot/sess.setup), | |
1000 | * return the new incomplete channel. | |
1001 | */ | |
1002 | struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses) | |
1003 | { | |
1004 | uint index = 0; | |
1005 | ||
1006 | if (!ses) | |
1007 | return NULL; | |
1008 | ||
1009 | if (!ses->binding) { | |
1010 | /* round robin */ | |
1011 | if (ses->chan_count > 1) { | |
1012 | index = (uint)atomic_inc_return(&ses->chan_seq); | |
1013 | index %= ses->chan_count; | |
1014 | } | |
1015 | return ses->chans[index].server; | |
1016 | } else { | |
1017 | return cifs_ses_server(ses); | |
1018 | } | |
1019 | } | |
1020 | ||
b8f57ee8 | 1021 | int |
e0bba0b8 RS |
1022 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
1023 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
1024 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 1025 | { |
480b1cb9 | 1026 | int i, j, optype, rc = 0; |
e0bba0b8 | 1027 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
8544f4aa | 1028 | bool cancelled_mid[MAX_COMPOUND] = {false}; |
34f4deb7 PS |
1029 | struct cifs_credits credits[MAX_COMPOUND] = { |
1030 | { .value = 0, .instance = 0 } | |
1031 | }; | |
1032 | unsigned int instance; | |
738f9de5 | 1033 | char *buf; |
3190b59a | 1034 | struct TCP_Server_Info *server; |
50c2f753 | 1035 | |
a891f0f8 | 1036 | optype = flags & CIFS_OP_MASK; |
133672ef | 1037 | |
e0bba0b8 RS |
1038 | for (i = 0; i < num_rqst; i++) |
1039 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
1040 | |
1041 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 1042 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
1043 | return -EIO; |
1044 | } | |
1045 | ||
5f68ea4a | 1046 | server = cifs_pick_channel(ses); |
d70e9fa5 | 1047 | |
3190b59a | 1048 | if (server->tcpStatus == CifsExiting) |
7ee1af76 | 1049 | return -ENOENT; |
7ee1af76 | 1050 | |
792af7b0 | 1051 | /* |
257b7809 | 1052 | * Wait for all the requests to become available. |
7091bcab PS |
1053 | * This approach still leaves the possibility to be stuck waiting for |
1054 | * credits if the server doesn't grant credits to the outstanding | |
257b7809 RS |
1055 | * requests and if the client is completely idle, not generating any |
1056 | * other requests. | |
1057 | * This can be handled by the eventual session reconnect. | |
792af7b0 | 1058 | */ |
3190b59a | 1059 | rc = wait_for_compound_request(server, num_rqst, flags, |
257b7809 RS |
1060 | &instance); |
1061 | if (rc) | |
1062 | return rc; | |
97ea4998 | 1063 | |
257b7809 RS |
1064 | for (i = 0; i < num_rqst; i++) { |
1065 | credits[i].value = 1; | |
1066 | credits[i].instance = instance; | |
8544f4aa | 1067 | } |
7ee1af76 | 1068 | |
792af7b0 PS |
1069 | /* |
1070 | * Make sure that we sign in the same order that we send on this socket | |
1071 | * and avoid races inside tcp sendmsg code that could cause corruption | |
1072 | * of smb data. | |
1073 | */ | |
7ee1af76 | 1074 | |
3190b59a | 1075 | mutex_lock(&server->srv_mutex); |
7ee1af76 | 1076 | |
97ea4998 PS |
1077 | /* |
1078 | * All the parts of the compound chain belong obtained credits from the | |
257b7809 | 1079 | * same session. We can not use credits obtained from the previous |
97ea4998 PS |
1080 | * session to send this request. Check if there were reconnects after |
1081 | * we obtained credits and return -EAGAIN in such cases to let callers | |
1082 | * handle it. | |
1083 | */ | |
3190b59a AA |
1084 | if (instance != server->reconnect_instance) { |
1085 | mutex_unlock(&server->srv_mutex); | |
97ea4998 | 1086 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1087 | add_credits(server, &credits[j], optype); |
97ea4998 PS |
1088 | return -EAGAIN; |
1089 | } | |
1090 | ||
e0bba0b8 | 1091 | for (i = 0; i < num_rqst; i++) { |
f780bd3f | 1092 | midQ[i] = server->ops->setup_request(ses, server, &rqst[i]); |
e0bba0b8 | 1093 | if (IS_ERR(midQ[i])) { |
3190b59a | 1094 | revert_current_mid(server, i); |
e0bba0b8 RS |
1095 | for (j = 0; j < i; j++) |
1096 | cifs_delete_mid(midQ[j]); | |
3190b59a | 1097 | mutex_unlock(&server->srv_mutex); |
8544f4aa | 1098 | |
e0bba0b8 | 1099 | /* Update # of requests on wire to server */ |
8544f4aa | 1100 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1101 | add_credits(server, &credits[j], optype); |
e0bba0b8 RS |
1102 | return PTR_ERR(midQ[i]); |
1103 | } | |
1104 | ||
1105 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
8a26f0f7 | 1106 | midQ[i]->optype = optype; |
4e34feb5 | 1107 | /* |
ee258d79 PS |
1108 | * Invoke callback for every part of the compound chain |
1109 | * to calculate credits properly. Wake up this thread only when | |
1110 | * the last element is received. | |
4e34feb5 RS |
1111 | */ |
1112 | if (i < num_rqst - 1) | |
ee258d79 PS |
1113 | midQ[i]->callback = cifs_compound_callback; |
1114 | else | |
1115 | midQ[i]->callback = cifs_compound_last_callback; | |
1da177e4 | 1116 | } |
3190b59a AA |
1117 | cifs_in_send_inc(server); |
1118 | rc = smb_send_rqst(server, num_rqst, rqst, flags); | |
1119 | cifs_in_send_dec(server); | |
e0bba0b8 RS |
1120 | |
1121 | for (i = 0; i < num_rqst; i++) | |
1122 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 1123 | |
c781af7e | 1124 | if (rc < 0) { |
3190b59a AA |
1125 | revert_current_mid(server, num_rqst); |
1126 | server->sequence_number -= 2; | |
c781af7e | 1127 | } |
e0bba0b8 | 1128 | |
3190b59a | 1129 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1130 | |
d69cb728 RS |
1131 | /* |
1132 | * If sending failed for some reason or it is an oplock break that we | |
1133 | * will not receive a response to - return credits back | |
1134 | */ | |
1135 | if (rc < 0 || (flags & CIFS_NO_SRV_RSP)) { | |
ee258d79 | 1136 | for (i = 0; i < num_rqst; i++) |
3190b59a | 1137 | add_credits(server, &credits[i], optype); |
cb5c2e63 | 1138 | goto out; |
ee258d79 PS |
1139 | } |
1140 | ||
1141 | /* | |
1142 | * At this point the request is passed to the network stack - we assume | |
1143 | * that any credits taken from the server structure on the client have | |
1144 | * been spent and we can't return them back. Once we receive responses | |
1145 | * we will collect credits granted by the server in the mid callbacks | |
1146 | * and add those credits to the server structure. | |
1147 | */ | |
e0bba0b8 | 1148 | |
cb5c2e63 RS |
1149 | /* |
1150 | * Compounding is never used during session establish. | |
1151 | */ | |
1152 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
1153 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, | |
1154 | rqst[0].rq_nvec); | |
e0bba0b8 | 1155 | |
cb5c2e63 | 1156 | for (i = 0; i < num_rqst; i++) { |
3190b59a | 1157 | rc = wait_for_response(server, midQ[i]); |
8a26f0f7 PS |
1158 | if (rc != 0) |
1159 | break; | |
1160 | } | |
1161 | if (rc != 0) { | |
1162 | for (; i < num_rqst; i++) { | |
afe6f653 | 1163 | cifs_server_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", |
43de1db3 | 1164 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); |
3190b59a | 1165 | send_cancel(server, &rqst[i], midQ[i]); |
e0bba0b8 | 1166 | spin_lock(&GlobalMid_Lock); |
7b71843f | 1167 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; |
e0bba0b8 | 1168 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { |
8a26f0f7 | 1169 | midQ[i]->callback = cifs_cancelled_callback; |
8544f4aa | 1170 | cancelled_mid[i] = true; |
34f4deb7 | 1171 | credits[i].value = 0; |
e0bba0b8 | 1172 | } |
1be912dd | 1173 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 1174 | } |
cb5c2e63 RS |
1175 | } |
1176 | ||
cb5c2e63 RS |
1177 | for (i = 0; i < num_rqst; i++) { |
1178 | if (rc < 0) | |
1179 | goto out; | |
e0bba0b8 | 1180 | |
3190b59a | 1181 | rc = cifs_sync_mid_result(midQ[i], server); |
e0bba0b8 | 1182 | if (rc != 0) { |
8544f4aa PS |
1183 | /* mark this mid as cancelled to not free it below */ |
1184 | cancelled_mid[i] = true; | |
1185 | goto out; | |
1be912dd | 1186 | } |
2b2bdfba | 1187 | |
e0bba0b8 RS |
1188 | if (!midQ[i]->resp_buf || |
1189 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
1190 | rc = -EIO; | |
1191 | cifs_dbg(FYI, "Bad MID state?\n"); | |
1192 | goto out; | |
1193 | } | |
a891f0f8 | 1194 | |
e0bba0b8 RS |
1195 | buf = (char *)midQ[i]->resp_buf; |
1196 | resp_iov[i].iov_base = buf; | |
1197 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
3190b59a | 1198 | server->vals->header_preamble_size; |
e0bba0b8 RS |
1199 | |
1200 | if (midQ[i]->large_buf) | |
1201 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
1202 | else | |
1203 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
1204 | ||
3190b59a | 1205 | rc = server->ops->check_receive(midQ[i], server, |
e0bba0b8 | 1206 | flags & CIFS_LOG_ERROR); |
1da177e4 | 1207 | |
e0bba0b8 | 1208 | /* mark it so buf will not be freed by cifs_delete_mid */ |
392e1c5d | 1209 | if ((flags & CIFS_NO_RSP_BUF) == 0) |
e0bba0b8 | 1210 | midQ[i]->resp_buf = NULL; |
cb5c2e63 | 1211 | |
e0bba0b8 | 1212 | } |
cb5c2e63 RS |
1213 | |
1214 | /* | |
1215 | * Compounding is never used during session establish. | |
1216 | */ | |
1217 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
1218 | struct kvec iov = { | |
1219 | .iov_base = resp_iov[0].iov_base, | |
1220 | .iov_len = resp_iov[0].iov_len | |
1221 | }; | |
1222 | smb311_update_preauth_hash(ses, &iov, 1); | |
1223 | } | |
1224 | ||
7ee1af76 | 1225 | out: |
4e34feb5 RS |
1226 | /* |
1227 | * This will dequeue all mids. After this it is important that the | |
1228 | * demultiplex_thread will not process any of these mids any futher. | |
1229 | * This is prevented above by using a noop callback that will not | |
1230 | * wake this thread except for the very last PDU. | |
1231 | */ | |
8544f4aa PS |
1232 | for (i = 0; i < num_rqst; i++) { |
1233 | if (!cancelled_mid[i]) | |
1234 | cifs_delete_mid(midQ[i]); | |
8544f4aa | 1235 | } |
1da177e4 | 1236 | |
d6e04ae6 SF |
1237 | return rc; |
1238 | } | |
1da177e4 | 1239 | |
e0bba0b8 RS |
1240 | int |
1241 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
1242 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
1243 | struct kvec *resp_iov) | |
1244 | { | |
1245 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
1246 | resp_iov); | |
1247 | } | |
1248 | ||
738f9de5 PS |
1249 | int |
1250 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
1251 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
1252 | const int flags, struct kvec *resp_iov) | |
1253 | { | |
1254 | struct smb_rqst rqst; | |
3cecf486 | 1255 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
1256 | int rc; |
1257 | ||
3cecf486 | 1258 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
1259 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
1260 | GFP_KERNEL); | |
117e3b7f SF |
1261 | if (!new_iov) { |
1262 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
1263 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 1264 | return -ENOMEM; |
117e3b7f | 1265 | } |
3cecf486 RS |
1266 | } else |
1267 | new_iov = s_iov; | |
738f9de5 PS |
1268 | |
1269 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
1270 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
1271 | ||
1272 | new_iov[0].iov_base = new_iov[1].iov_base; | |
1273 | new_iov[0].iov_len = 4; | |
1274 | new_iov[1].iov_base += 4; | |
1275 | new_iov[1].iov_len -= 4; | |
1276 | ||
1277 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
1278 | rqst.rq_iov = new_iov; | |
1279 | rqst.rq_nvec = n_vec + 1; | |
1280 | ||
1281 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1282 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1283 | kfree(new_iov); | |
738f9de5 PS |
1284 | return rc; |
1285 | } | |
1286 | ||
1da177e4 | 1287 | int |
96daf2b0 | 1288 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1289 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
480b1cb9 | 1290 | int *pbytes_returned, const int flags) |
1da177e4 LT |
1291 | { |
1292 | int rc = 0; | |
1da177e4 | 1293 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1294 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1295 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1296 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1297 | struct cifs_credits credits = { .value = 1, .instance = 0 }; |
ac6ad7a8 | 1298 | struct TCP_Server_Info *server; |
1da177e4 LT |
1299 | |
1300 | if (ses == NULL) { | |
f96637be | 1301 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1302 | return -EIO; |
1303 | } | |
ac6ad7a8 | 1304 | server = ses->server; |
afe6f653 | 1305 | if (server == NULL) { |
f96637be | 1306 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1307 | return -EIO; |
1308 | } | |
1309 | ||
afe6f653 | 1310 | if (server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1311 | return -ENOENT; |
1312 | ||
79a58d1f | 1313 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1314 | to the same server. We may make this configurable later or |
1315 | use ses->maxReq */ | |
1da177e4 | 1316 | |
fb2036d8 | 1317 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
a0a3036b JP |
1318 | cifs_server_dbg(VFS, "Invalid length, greater than maximum frame, %d\n", |
1319 | len); | |
6d9c6d54 VL |
1320 | return -EIO; |
1321 | } | |
1322 | ||
afe6f653 | 1323 | rc = wait_for_free_request(server, flags, &credits.instance); |
7ee1af76 JA |
1324 | if (rc) |
1325 | return rc; | |
1326 | ||
79a58d1f | 1327 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1328 | and avoid races inside tcp sendmsg code that could cause corruption |
1329 | of smb data */ | |
1330 | ||
afe6f653 | 1331 | mutex_lock(&server->srv_mutex); |
1da177e4 | 1332 | |
7ee1af76 JA |
1333 | rc = allocate_mid(ses, in_buf, &midQ); |
1334 | if (rc) { | |
8bd3754c | 1335 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1336 | /* Update # of requests on wire to server */ |
afe6f653 | 1337 | add_credits(server, &credits, 0); |
7ee1af76 | 1338 | return rc; |
1da177e4 LT |
1339 | } |
1340 | ||
afe6f653 | 1341 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1342 | if (rc) { |
afe6f653 | 1343 | mutex_unlock(&server->srv_mutex); |
829049cb VL |
1344 | goto out; |
1345 | } | |
1da177e4 | 1346 | |
7c9421e1 | 1347 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1348 | |
afe6f653 RS |
1349 | cifs_in_send_inc(server); |
1350 | rc = smb_send(server, in_buf, len); | |
1351 | cifs_in_send_dec(server); | |
789e6661 | 1352 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1353 | |
1354 | if (rc < 0) | |
afe6f653 | 1355 | server->sequence_number -= 2; |
ad313cb8 | 1356 | |
afe6f653 | 1357 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1358 | |
79a58d1f | 1359 | if (rc < 0) |
7ee1af76 JA |
1360 | goto out; |
1361 | ||
afe6f653 | 1362 | rc = wait_for_response(server, midQ); |
1be912dd | 1363 | if (rc != 0) { |
afe6f653 | 1364 | send_cancel(server, &rqst, midQ); |
1be912dd | 1365 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1366 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1367 | /* no longer considered to be "in-flight" */ |
1368 | midQ->callback = DeleteMidQEntry; | |
1369 | spin_unlock(&GlobalMid_Lock); | |
afe6f653 | 1370 | add_credits(server, &credits, 0); |
1be912dd JL |
1371 | return rc; |
1372 | } | |
1373 | spin_unlock(&GlobalMid_Lock); | |
1374 | } | |
1da177e4 | 1375 | |
afe6f653 | 1376 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1377 | if (rc != 0) { |
afe6f653 | 1378 | add_credits(server, &credits, 0); |
1da177e4 LT |
1379 | return rc; |
1380 | } | |
50c2f753 | 1381 | |
2c8f981d | 1382 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1383 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1384 | rc = -EIO; |
afe6f653 | 1385 | cifs_server_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1386 | goto out; |
1da177e4 | 1387 | } |
7ee1af76 | 1388 | |
d4e4854f | 1389 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1390 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1391 | rc = cifs_check_receive(midQ, server, 0); |
7ee1af76 | 1392 | out: |
3c1bf7e4 | 1393 | cifs_delete_mid(midQ); |
afe6f653 | 1394 | add_credits(server, &credits, 0); |
1da177e4 | 1395 | |
7ee1af76 JA |
1396 | return rc; |
1397 | } | |
1da177e4 | 1398 | |
7ee1af76 JA |
1399 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1400 | blocking lock to return. */ | |
1401 | ||
1402 | static int | |
96daf2b0 | 1403 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1404 | struct smb_hdr *in_buf, |
1405 | struct smb_hdr *out_buf) | |
1406 | { | |
1407 | int bytes_returned; | |
96daf2b0 | 1408 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1409 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1410 | ||
1411 | /* We just modify the current in_buf to change | |
1412 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1413 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1414 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1415 | ||
1416 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1417 | pSMB->Timeout = 0; | |
88257360 | 1418 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1419 | |
1420 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1421 | &bytes_returned, 0); |
7ee1af76 JA |
1422 | } |
1423 | ||
1424 | int | |
96daf2b0 | 1425 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1426 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1427 | int *pbytes_returned) | |
1428 | { | |
1429 | int rc = 0; | |
1430 | int rstart = 0; | |
7ee1af76 | 1431 | struct mid_q_entry *midQ; |
96daf2b0 | 1432 | struct cifs_ses *ses; |
fb2036d8 PS |
1433 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1434 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1435 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1436 | unsigned int instance; |
afe6f653 | 1437 | struct TCP_Server_Info *server; |
7ee1af76 JA |
1438 | |
1439 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1440 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1441 | return -EIO; |
1442 | } | |
1443 | ses = tcon->ses; | |
afe6f653 | 1444 | server = ses->server; |
7ee1af76 | 1445 | |
afe6f653 | 1446 | if (server == NULL) { |
f96637be | 1447 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1448 | return -EIO; |
1449 | } | |
1450 | ||
afe6f653 | 1451 | if (server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1452 | return -ENOENT; |
1453 | ||
79a58d1f | 1454 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1455 | to the same server. We may make this configurable later or |
1456 | use ses->maxReq */ | |
1457 | ||
fb2036d8 | 1458 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
a0a3036b JP |
1459 | cifs_tcon_dbg(VFS, "Invalid length, greater than maximum frame, %d\n", |
1460 | len); | |
6d9c6d54 VL |
1461 | return -EIO; |
1462 | } | |
1463 | ||
afe6f653 | 1464 | rc = wait_for_free_request(server, CIFS_BLOCKING_OP, &instance); |
7ee1af76 JA |
1465 | if (rc) |
1466 | return rc; | |
1467 | ||
79a58d1f | 1468 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1469 | and avoid races inside tcp sendmsg code that could cause corruption |
1470 | of smb data */ | |
1471 | ||
afe6f653 | 1472 | mutex_lock(&server->srv_mutex); |
7ee1af76 JA |
1473 | |
1474 | rc = allocate_mid(ses, in_buf, &midQ); | |
1475 | if (rc) { | |
afe6f653 | 1476 | mutex_unlock(&server->srv_mutex); |
7ee1af76 JA |
1477 | return rc; |
1478 | } | |
1479 | ||
afe6f653 | 1480 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1481 | if (rc) { |
3c1bf7e4 | 1482 | cifs_delete_mid(midQ); |
afe6f653 | 1483 | mutex_unlock(&server->srv_mutex); |
829049cb VL |
1484 | return rc; |
1485 | } | |
1da177e4 | 1486 | |
7c9421e1 | 1487 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
afe6f653 RS |
1488 | cifs_in_send_inc(server); |
1489 | rc = smb_send(server, in_buf, len); | |
1490 | cifs_in_send_dec(server); | |
789e6661 | 1491 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1492 | |
1493 | if (rc < 0) | |
afe6f653 | 1494 | server->sequence_number -= 2; |
ad313cb8 | 1495 | |
afe6f653 | 1496 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1497 | |
79a58d1f | 1498 | if (rc < 0) { |
3c1bf7e4 | 1499 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1500 | return rc; |
1501 | } | |
1502 | ||
1503 | /* Wait for a reply - allow signals to interrupt. */ | |
afe6f653 | 1504 | rc = wait_event_interruptible(server->response_q, |
7c9421e1 | 1505 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
afe6f653 RS |
1506 | ((server->tcpStatus != CifsGood) && |
1507 | (server->tcpStatus != CifsNew))); | |
7ee1af76 JA |
1508 | |
1509 | /* Were we interrupted by a signal ? */ | |
1510 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1511 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
afe6f653 RS |
1512 | ((server->tcpStatus == CifsGood) || |
1513 | (server->tcpStatus == CifsNew))) { | |
7ee1af76 JA |
1514 | |
1515 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1516 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1517 | blocking lock to return. */ | |
afe6f653 | 1518 | rc = send_cancel(server, &rqst, midQ); |
7ee1af76 | 1519 | if (rc) { |
3c1bf7e4 | 1520 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1521 | return rc; |
1522 | } | |
1523 | } else { | |
1524 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1525 | to cause the blocking lock to return. */ | |
1526 | ||
1527 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1528 | ||
1529 | /* If we get -ENOLCK back the lock may have | |
1530 | already been removed. Don't exit in this case. */ | |
1531 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1532 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1533 | return rc; |
1534 | } | |
1535 | } | |
1536 | ||
afe6f653 | 1537 | rc = wait_for_response(server, midQ); |
1be912dd | 1538 | if (rc) { |
afe6f653 | 1539 | send_cancel(server, &rqst, midQ); |
1be912dd | 1540 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1541 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1542 | /* no longer considered to be "in-flight" */ |
1543 | midQ->callback = DeleteMidQEntry; | |
1544 | spin_unlock(&GlobalMid_Lock); | |
1545 | return rc; | |
1546 | } | |
1547 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1548 | } |
1be912dd JL |
1549 | |
1550 | /* We got the response - restart system call. */ | |
1551 | rstart = 1; | |
7ee1af76 JA |
1552 | } |
1553 | ||
afe6f653 | 1554 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1555 | if (rc != 0) |
7ee1af76 | 1556 | return rc; |
50c2f753 | 1557 | |
17c8bfed | 1558 | /* rcvd frame is ok */ |
7c9421e1 | 1559 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1560 | rc = -EIO; |
3175eb9b | 1561 | cifs_tcon_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1562 | goto out; |
1563 | } | |
1da177e4 | 1564 | |
d4e4854f | 1565 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1566 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1567 | rc = cifs_check_receive(midQ, server, 0); |
17c8bfed | 1568 | out: |
3c1bf7e4 | 1569 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1570 | if (rstart && rc == -EACCES) |
1571 | return -ERESTARTSYS; | |
1da177e4 LT |
1572 | return rc; |
1573 | } |