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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 | */ | |
79 | temp->callback = cifs_wake_up_task; | |
80 | temp->callback_data = current; | |
1da177e4 | 81 | |
1da177e4 | 82 | atomic_inc(&midCount); |
7c9421e1 | 83 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
84 | return temp; |
85 | } | |
86 | ||
696e420b LP |
87 | static void _cifs_mid_q_entry_release(struct kref *refcount) |
88 | { | |
89 | struct mid_q_entry *mid = container_of(refcount, struct mid_q_entry, | |
90 | refcount); | |
91 | ||
92 | mempool_free(mid, cifs_mid_poolp); | |
93 | } | |
94 | ||
95 | void cifs_mid_q_entry_release(struct mid_q_entry *midEntry) | |
96 | { | |
97 | spin_lock(&GlobalMid_Lock); | |
98 | kref_put(&midEntry->refcount, _cifs_mid_q_entry_release); | |
99 | spin_unlock(&GlobalMid_Lock); | |
100 | } | |
101 | ||
766fdbb5 | 102 | void |
1da177e4 LT |
103 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
104 | { | |
1047abc1 | 105 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 106 | __le16 command = midEntry->server->vals->lock_cmd; |
433b8dd7 | 107 | __u16 smb_cmd = le16_to_cpu(midEntry->command); |
1047abc1 | 108 | unsigned long now; |
433b8dd7 SF |
109 | unsigned long roundtrip_time; |
110 | struct TCP_Server_Info *server = midEntry->server; | |
1047abc1 | 111 | #endif |
7c9421e1 | 112 | midEntry->mid_state = MID_FREE; |
8097531a | 113 | atomic_dec(&midCount); |
7c9421e1 | 114 | if (midEntry->large_buf) |
b8643e1b SF |
115 | cifs_buf_release(midEntry->resp_buf); |
116 | else | |
117 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
118 | #ifdef CONFIG_CIFS_STATS2 |
119 | now = jiffies; | |
433b8dd7 | 120 | if (now < midEntry->when_alloc) |
afe6f653 | 121 | cifs_server_dbg(VFS, "invalid mid allocation time\n"); |
433b8dd7 SF |
122 | roundtrip_time = now - midEntry->when_alloc; |
123 | ||
124 | if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) { | |
125 | if (atomic_read(&server->num_cmds[smb_cmd]) == 0) { | |
126 | server->slowest_cmd[smb_cmd] = roundtrip_time; | |
127 | server->fastest_cmd[smb_cmd] = roundtrip_time; | |
128 | } else { | |
129 | if (server->slowest_cmd[smb_cmd] < roundtrip_time) | |
130 | server->slowest_cmd[smb_cmd] = roundtrip_time; | |
131 | else if (server->fastest_cmd[smb_cmd] > roundtrip_time) | |
132 | server->fastest_cmd[smb_cmd] = roundtrip_time; | |
133 | } | |
134 | cifs_stats_inc(&server->num_cmds[smb_cmd]); | |
135 | server->time_per_cmd[smb_cmd] += roundtrip_time; | |
136 | } | |
00778e22 SF |
137 | /* |
138 | * commands taking longer than one second (default) can be indications | |
139 | * that something is wrong, unless it is quite a slow link or a very | |
140 | * busy server. Note that this calc is unlikely or impossible to wrap | |
141 | * as long as slow_rsp_threshold is not set way above recommended max | |
142 | * value (32767 ie 9 hours) and is generally harmless even if wrong | |
143 | * since only affects debug counters - so leaving the calc as simple | |
144 | * comparison rather than doing multiple conversions and overflow | |
145 | * checks | |
146 | */ | |
147 | if ((slow_rsp_threshold != 0) && | |
148 | time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && | |
020eec5f | 149 | (midEntry->command != command)) { |
f5942db5 SF |
150 | /* |
151 | * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command | |
152 | * NB: le16_to_cpu returns unsigned so can not be negative below | |
153 | */ | |
433b8dd7 SF |
154 | if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) |
155 | cifs_stats_inc(&server->smb2slowcmd[smb_cmd]); | |
468d6779 | 156 | |
433b8dd7 | 157 | trace_smb3_slow_rsp(smb_cmd, midEntry->mid, midEntry->pid, |
020eec5f SF |
158 | midEntry->when_sent, midEntry->when_received); |
159 | if (cifsFYI & CIFS_TIMER) { | |
0b456f04 | 160 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 161 | midEntry->command, midEntry->mid); |
f80eaedd | 162 | cifs_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
163 | now - midEntry->when_alloc, |
164 | now - midEntry->when_sent, | |
165 | now - midEntry->when_received); | |
166 | } | |
167 | } | |
168 | #endif | |
696e420b | 169 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
170 | } |
171 | ||
3c1bf7e4 PS |
172 | void |
173 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
174 | { |
175 | spin_lock(&GlobalMid_Lock); | |
ddf83afb RS |
176 | list_del_init(&mid->qhead); |
177 | mid->mid_flags |= MID_DELETED; | |
ddc8cf8f JL |
178 | spin_unlock(&GlobalMid_Lock); |
179 | ||
180 | DeleteMidQEntry(mid); | |
181 | } | |
182 | ||
6f49f46b JL |
183 | /* |
184 | * smb_send_kvec - send an array of kvecs to the server | |
185 | * @server: Server to send the data to | |
3ab3f2a1 | 186 | * @smb_msg: Message to send |
6f49f46b JL |
187 | * @sent: amount of data sent on socket is stored here |
188 | * | |
189 | * Our basic "send data to server" function. Should be called with srv_mutex | |
190 | * held. The caller is responsible for handling the results. | |
191 | */ | |
d6e04ae6 | 192 | static int |
3ab3f2a1 AV |
193 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
194 | size_t *sent) | |
1da177e4 LT |
195 | { |
196 | int rc = 0; | |
3ab3f2a1 | 197 | int retries = 0; |
edf1ae40 | 198 | struct socket *ssocket = server->ssocket; |
50c2f753 | 199 | |
6f49f46b JL |
200 | *sent = 0; |
201 | ||
3ab3f2a1 AV |
202 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
203 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
204 | smb_msg->msg_control = NULL; | |
205 | smb_msg->msg_controllen = 0; | |
0496e02d | 206 | if (server->noblocksnd) |
3ab3f2a1 | 207 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 208 | else |
3ab3f2a1 | 209 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 210 | |
3ab3f2a1 | 211 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
212 | /* |
213 | * If blocking send, we try 3 times, since each can block | |
214 | * for 5 seconds. For nonblocking we have to try more | |
215 | * but wait increasing amounts of time allowing time for | |
216 | * socket to clear. The overall time we wait in either | |
217 | * case to send on the socket is about 15 seconds. | |
218 | * Similarly we wait for 15 seconds for a response from | |
219 | * the server in SendReceive[2] for the server to send | |
220 | * a response back for most types of requests (except | |
221 | * SMB Write past end of file which can be slow, and | |
222 | * blocking lock operations). NFS waits slightly longer | |
223 | * than CIFS, but this can make it take longer for | |
224 | * nonresponsive servers to be detected and 15 seconds | |
225 | * is more than enough time for modern networks to | |
226 | * send a packet. In most cases if we fail to send | |
227 | * after the retries we will kill the socket and | |
228 | * reconnect which may clear the network problem. | |
229 | */ | |
3ab3f2a1 | 230 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 231 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
232 | retries++; |
233 | if (retries >= 14 || | |
234 | (!server->noblocksnd && (retries > 2))) { | |
afe6f653 | 235 | cifs_server_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
f96637be | 236 | ssocket); |
3ab3f2a1 | 237 | return -EAGAIN; |
1da177e4 | 238 | } |
3ab3f2a1 | 239 | msleep(1 << retries); |
1da177e4 LT |
240 | continue; |
241 | } | |
6f49f46b | 242 | |
79a58d1f | 243 | if (rc < 0) |
3ab3f2a1 | 244 | return rc; |
6f49f46b | 245 | |
79a58d1f | 246 | if (rc == 0) { |
3e84469d SF |
247 | /* should never happen, letting socket clear before |
248 | retrying is our only obvious option here */ | |
afe6f653 | 249 | cifs_server_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
250 | msleep(500); |
251 | continue; | |
d6e04ae6 | 252 | } |
6f49f46b | 253 | |
3ab3f2a1 AV |
254 | /* send was at least partially successful */ |
255 | *sent += rc; | |
256 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 257 | } |
3ab3f2a1 | 258 | return 0; |
97bc00b3 JL |
259 | } |
260 | ||
35e2cc1b | 261 | unsigned long |
81f39f95 | 262 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
263 | { |
264 | unsigned int i; | |
35e2cc1b PA |
265 | struct kvec *iov; |
266 | int nvec; | |
a26054d1 JL |
267 | unsigned long buflen = 0; |
268 | ||
81f39f95 RS |
269 | if (server->vals->header_preamble_size == 0 && |
270 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
271 | iov = &rqst->rq_iov[1]; |
272 | nvec = rqst->rq_nvec - 1; | |
273 | } else { | |
274 | iov = rqst->rq_iov; | |
275 | nvec = rqst->rq_nvec; | |
276 | } | |
277 | ||
a26054d1 | 278 | /* total up iov array first */ |
35e2cc1b | 279 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
280 | buflen += iov[i].iov_len; |
281 | ||
c06a0f2d LL |
282 | /* |
283 | * Add in the page array if there is one. The caller needs to make | |
284 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
285 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
286 | * PAGE_SIZE. | |
287 | */ | |
a26054d1 | 288 | if (rqst->rq_npages) { |
c06a0f2d LL |
289 | if (rqst->rq_npages == 1) |
290 | buflen += rqst->rq_tailsz; | |
291 | else { | |
292 | /* | |
293 | * If there is more than one page, calculate the | |
294 | * buffer length based on rq_offset and rq_tailsz | |
295 | */ | |
296 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
297 | rqst->rq_offset; | |
298 | buflen += rqst->rq_tailsz; | |
299 | } | |
a26054d1 JL |
300 | } |
301 | ||
302 | return buflen; | |
303 | } | |
304 | ||
6f49f46b | 305 | static int |
07cd952f RS |
306 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
307 | struct smb_rqst *rqst) | |
6f49f46b | 308 | { |
07cd952f RS |
309 | int rc = 0; |
310 | struct kvec *iov; | |
311 | int n_vec; | |
312 | unsigned int send_length = 0; | |
313 | unsigned int i, j; | |
b30c74c7 | 314 | sigset_t mask, oldmask; |
3ab3f2a1 | 315 | size_t total_len = 0, sent, size; |
b8eed283 | 316 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 317 | struct msghdr smb_msg; |
b8eed283 | 318 | int val = 1; |
c713c877 RS |
319 | __be32 rfc1002_marker; |
320 | ||
9762c2d0 | 321 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
4739f232 | 322 | rc = smbd_send(server, num_rqst, rqst); |
9762c2d0 LL |
323 | goto smbd_done; |
324 | } | |
afc18a6f | 325 | |
ea702b80 | 326 | if (ssocket == NULL) |
afc18a6f | 327 | return -EAGAIN; |
ea702b80 | 328 | |
b30c74c7 PS |
329 | if (signal_pending(current)) { |
330 | cifs_dbg(FYI, "signal is pending before sending any data\n"); | |
331 | return -EINTR; | |
332 | } | |
333 | ||
b8eed283 JL |
334 | /* cork the socket */ |
335 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
336 | (char *)&val, sizeof(val)); | |
337 | ||
07cd952f | 338 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 339 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
340 | rfc1002_marker = cpu_to_be32(send_length); |
341 | ||
b30c74c7 PS |
342 | /* |
343 | * We should not allow signals to interrupt the network send because | |
344 | * any partial send will cause session reconnects thus increasing | |
345 | * latency of system calls and overload a server with unnecessary | |
346 | * requests. | |
347 | */ | |
348 | ||
349 | sigfillset(&mask); | |
350 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
351 | ||
c713c877 RS |
352 | /* Generate a rfc1002 marker for SMB2+ */ |
353 | if (server->vals->header_preamble_size == 0) { | |
354 | struct kvec hiov = { | |
355 | .iov_base = &rfc1002_marker, | |
356 | .iov_len = 4 | |
357 | }; | |
aa563d7b | 358 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
359 | rc = smb_send_kvec(server, &smb_msg, &sent); |
360 | if (rc < 0) | |
b30c74c7 | 361 | goto unmask; |
c713c877 RS |
362 | |
363 | total_len += sent; | |
364 | send_length += 4; | |
365 | } | |
366 | ||
662bf5bc PA |
367 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
368 | ||
07cd952f RS |
369 | for (j = 0; j < num_rqst; j++) { |
370 | iov = rqst[j].rq_iov; | |
371 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 372 | |
07cd952f | 373 | size = 0; |
662bf5bc PA |
374 | for (i = 0; i < n_vec; i++) { |
375 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 376 | size += iov[i].iov_len; |
662bf5bc | 377 | } |
97bc00b3 | 378 | |
aa563d7b | 379 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 380 | |
3ab3f2a1 | 381 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 382 | if (rc < 0) |
b30c74c7 | 383 | goto unmask; |
97bc00b3 JL |
384 | |
385 | total_len += sent; | |
07cd952f RS |
386 | |
387 | /* now walk the page array and send each page in it */ | |
388 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
389 | struct bio_vec bvec; | |
390 | ||
391 | bvec.bv_page = rqst[j].rq_pages[i]; | |
392 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
393 | &bvec.bv_offset); | |
394 | ||
aa563d7b | 395 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
396 | &bvec, 1, bvec.bv_len); |
397 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
398 | if (rc < 0) | |
399 | break; | |
400 | ||
401 | total_len += sent; | |
402 | } | |
97bc00b3 | 403 | } |
1da177e4 | 404 | |
b30c74c7 PS |
405 | unmask: |
406 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
407 | ||
408 | /* | |
409 | * If signal is pending but we have already sent the whole packet to | |
410 | * the server we need to return success status to allow a corresponding | |
411 | * mid entry to be kept in the pending requests queue thus allowing | |
412 | * to handle responses from the server by the client. | |
413 | * | |
414 | * If only part of the packet has been sent there is no need to hide | |
415 | * interrupt because the session will be reconnected anyway, so there | |
416 | * won't be any response from the server to handle. | |
417 | */ | |
418 | ||
419 | if (signal_pending(current) && (total_len != send_length)) { | |
420 | cifs_dbg(FYI, "signal is pending after attempt to send\n"); | |
421 | rc = -EINTR; | |
422 | } | |
423 | ||
b8eed283 JL |
424 | /* uncork it */ |
425 | val = 0; | |
426 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
427 | (char *)&val, sizeof(val)); | |
428 | ||
c713c877 | 429 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 430 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 431 | send_length, total_len); |
6f49f46b JL |
432 | /* |
433 | * If we have only sent part of an SMB then the next SMB could | |
434 | * be taken as the remainder of this one. We need to kill the | |
435 | * socket so the server throws away the partial SMB | |
436 | */ | |
edf1ae40 | 437 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
438 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
439 | server->hostname); | |
edf1ae40 | 440 | } |
9762c2d0 | 441 | smbd_done: |
d804d41d | 442 | if (rc < 0 && rc != -EINTR) |
afe6f653 | 443 | cifs_server_dbg(VFS, "Error %d sending data on socket to server\n", |
f96637be | 444 | rc); |
ee13919c | 445 | else if (rc > 0) |
1da177e4 | 446 | rc = 0; |
1da177e4 LT |
447 | |
448 | return rc; | |
449 | } | |
450 | ||
6f49f46b | 451 | static int |
1f3a8f5f RS |
452 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
453 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 454 | { |
b2c96de7 RS |
455 | struct kvec iov; |
456 | struct smb2_transform_hdr tr_hdr; | |
457 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
458 | int rc; |
459 | ||
460 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
461 | return __smb_send_rqst(server, num_rqst, rqst); |
462 | ||
463 | if (num_rqst > MAX_COMPOUND - 1) | |
464 | return -ENOMEM; | |
7fb8986e | 465 | |
b2c96de7 RS |
466 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
467 | memset(&iov, 0, sizeof(iov)); | |
468 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
469 | ||
470 | iov.iov_base = &tr_hdr; | |
471 | iov.iov_len = sizeof(tr_hdr); | |
472 | cur_rqst[0].rq_iov = &iov; | |
473 | cur_rqst[0].rq_nvec = 1; | |
474 | ||
475 | if (!server->ops->init_transform_rq) { | |
afe6f653 RS |
476 | cifs_server_dbg(VFS, "Encryption requested but transform " |
477 | "callback is missing\n"); | |
7fb8986e PS |
478 | return -EIO; |
479 | } | |
6f49f46b | 480 | |
1f3a8f5f RS |
481 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
482 | &cur_rqst[0], rqst); | |
7fb8986e PS |
483 | if (rc) |
484 | return rc; | |
485 | ||
1f3a8f5f RS |
486 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
487 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 488 | return rc; |
6f49f46b JL |
489 | } |
490 | ||
0496e02d JL |
491 | int |
492 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
493 | unsigned int smb_buf_length) | |
494 | { | |
738f9de5 | 495 | struct kvec iov[2]; |
7fb8986e PS |
496 | struct smb_rqst rqst = { .rq_iov = iov, |
497 | .rq_nvec = 2 }; | |
0496e02d | 498 | |
738f9de5 PS |
499 | iov[0].iov_base = smb_buffer; |
500 | iov[0].iov_len = 4; | |
501 | iov[1].iov_base = (char *)smb_buffer + 4; | |
502 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 503 | |
07cd952f | 504 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
505 | } |
506 | ||
fc40f9cf | 507 | static int |
b227d215 | 508 | wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits, |
2b53b929 RS |
509 | const int timeout, const int flags, |
510 | unsigned int *instance) | |
1da177e4 | 511 | { |
5bc59498 | 512 | int rc; |
4230cff8 RS |
513 | int *credits; |
514 | int optype; | |
2b53b929 RS |
515 | long int t; |
516 | ||
517 | if (timeout < 0) | |
518 | t = MAX_JIFFY_OFFSET; | |
519 | else | |
520 | t = msecs_to_jiffies(timeout); | |
4230cff8 RS |
521 | |
522 | optype = flags & CIFS_OP_MASK; | |
5bc59498 | 523 | |
34f4deb7 PS |
524 | *instance = 0; |
525 | ||
4230cff8 RS |
526 | credits = server->ops->get_credits_field(server, optype); |
527 | /* Since an echo is already inflight, no need to wait to send another */ | |
528 | if (*credits <= 0 && optype == CIFS_ECHO_OP) | |
529 | return -EAGAIN; | |
530 | ||
fc40f9cf | 531 | spin_lock(&server->req_lock); |
392e1c5d | 532 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) { |
1da177e4 | 533 | /* oplock breaks must not be held up */ |
fc40f9cf | 534 | server->in_flight++; |
bc205ed1 | 535 | *credits -= 1; |
34f4deb7 | 536 | *instance = server->reconnect_instance; |
fc40f9cf | 537 | spin_unlock(&server->req_lock); |
27a97a61 VL |
538 | return 0; |
539 | } | |
540 | ||
27a97a61 | 541 | while (1) { |
b227d215 | 542 | if (*credits < num_credits) { |
fc40f9cf | 543 | spin_unlock(&server->req_lock); |
789e6661 | 544 | cifs_num_waiters_inc(server); |
2b53b929 RS |
545 | rc = wait_event_killable_timeout(server->request_q, |
546 | has_credits(server, credits, num_credits), t); | |
789e6661 | 547 | cifs_num_waiters_dec(server); |
2b53b929 | 548 | if (!rc) { |
7937ca96 SF |
549 | trace_smb3_credit_timeout(server->CurrentMid, |
550 | server->hostname, num_credits); | |
afe6f653 | 551 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
2b53b929 RS |
552 | timeout); |
553 | return -ENOTSUPP; | |
554 | } | |
555 | if (rc == -ERESTARTSYS) | |
556 | return -ERESTARTSYS; | |
fc40f9cf | 557 | spin_lock(&server->req_lock); |
27a97a61 | 558 | } else { |
c5797a94 | 559 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 560 | spin_unlock(&server->req_lock); |
27a97a61 | 561 | return -ENOENT; |
1da177e4 | 562 | } |
27a97a61 | 563 | |
16b34aa4 RS |
564 | /* |
565 | * For normal commands, reserve the last MAX_COMPOUND | |
566 | * credits to compound requests. | |
567 | * Otherwise these compounds could be permanently | |
568 | * starved for credits by single-credit requests. | |
569 | * | |
570 | * To prevent spinning CPU, block this thread until | |
571 | * there are >MAX_COMPOUND credits available. | |
572 | * But only do this is we already have a lot of | |
573 | * credits in flight to avoid triggering this check | |
574 | * for servers that are slow to hand out credits on | |
575 | * new sessions. | |
576 | */ | |
577 | if (!optype && num_credits == 1 && | |
578 | server->in_flight > 2 * MAX_COMPOUND && | |
579 | *credits <= MAX_COMPOUND) { | |
580 | spin_unlock(&server->req_lock); | |
581 | cifs_num_waiters_inc(server); | |
2b53b929 RS |
582 | rc = wait_event_killable_timeout( |
583 | server->request_q, | |
16b34aa4 | 584 | has_credits(server, credits, |
2b53b929 RS |
585 | MAX_COMPOUND + 1), |
586 | t); | |
16b34aa4 | 587 | cifs_num_waiters_dec(server); |
2b53b929 | 588 | if (!rc) { |
7937ca96 SF |
589 | trace_smb3_credit_timeout( |
590 | server->CurrentMid, | |
591 | server->hostname, num_credits); | |
afe6f653 | 592 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
2b53b929 RS |
593 | timeout); |
594 | return -ENOTSUPP; | |
595 | } | |
596 | if (rc == -ERESTARTSYS) | |
597 | return -ERESTARTSYS; | |
16b34aa4 RS |
598 | spin_lock(&server->req_lock); |
599 | continue; | |
600 | } | |
601 | ||
2d86dbc9 PS |
602 | /* |
603 | * Can not count locking commands against total | |
604 | * as they are allowed to block on server. | |
605 | */ | |
27a97a61 VL |
606 | |
607 | /* update # of requests on the wire to server */ | |
4230cff8 | 608 | if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) { |
b227d215 RS |
609 | *credits -= num_credits; |
610 | server->in_flight += num_credits; | |
34f4deb7 | 611 | *instance = server->reconnect_instance; |
2d86dbc9 | 612 | } |
fc40f9cf | 613 | spin_unlock(&server->req_lock); |
27a97a61 | 614 | break; |
1da177e4 LT |
615 | } |
616 | } | |
7ee1af76 JA |
617 | return 0; |
618 | } | |
1da177e4 | 619 | |
bc205ed1 | 620 | static int |
480b1cb9 RS |
621 | wait_for_free_request(struct TCP_Server_Info *server, const int flags, |
622 | unsigned int *instance) | |
bc205ed1 | 623 | { |
2b53b929 RS |
624 | return wait_for_free_credits(server, 1, -1, flags, |
625 | instance); | |
bc205ed1 PS |
626 | } |
627 | ||
257b7809 RS |
628 | static int |
629 | wait_for_compound_request(struct TCP_Server_Info *server, int num, | |
630 | const int flags, unsigned int *instance) | |
631 | { | |
632 | int *credits; | |
633 | ||
634 | credits = server->ops->get_credits_field(server, flags & CIFS_OP_MASK); | |
635 | ||
636 | spin_lock(&server->req_lock); | |
637 | if (*credits < num) { | |
638 | /* | |
639 | * Return immediately if not too many requests in flight since | |
640 | * we will likely be stuck on waiting for credits. | |
641 | */ | |
642 | if (server->in_flight < num - *credits) { | |
643 | spin_unlock(&server->req_lock); | |
644 | return -ENOTSUPP; | |
645 | } | |
646 | } | |
647 | spin_unlock(&server->req_lock); | |
648 | ||
649 | return wait_for_free_credits(server, num, 60000, flags, | |
650 | instance); | |
651 | } | |
652 | ||
cb7e9eab PS |
653 | int |
654 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
335b7b62 | 655 | unsigned int *num, struct cifs_credits *credits) |
cb7e9eab PS |
656 | { |
657 | *num = size; | |
335b7b62 PS |
658 | credits->value = 0; |
659 | credits->instance = server->reconnect_instance; | |
cb7e9eab PS |
660 | return 0; |
661 | } | |
662 | ||
96daf2b0 | 663 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
664 | struct mid_q_entry **ppmidQ) |
665 | { | |
1da177e4 | 666 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 667 | return -ENOENT; |
8fbbd365 VL |
668 | } |
669 | ||
670 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 671 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 672 | return -EAGAIN; |
8fbbd365 VL |
673 | } |
674 | ||
7f48558e | 675 | if (ses->status == CifsNew) { |
79a58d1f | 676 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 677 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 678 | return -EAGAIN; |
ad7a2926 | 679 | /* else ok - we are setting up session */ |
1da177e4 | 680 | } |
7f48558e SP |
681 | |
682 | if (ses->status == CifsExiting) { | |
683 | /* check if SMB session is bad because we are setting it up */ | |
684 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
685 | return -EAGAIN; | |
686 | /* else ok - we are shutting down session */ | |
687 | } | |
688 | ||
24b9b06b | 689 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 690 | if (*ppmidQ == NULL) |
7ee1af76 | 691 | return -ENOMEM; |
ddc8cf8f JL |
692 | spin_lock(&GlobalMid_Lock); |
693 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
694 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
695 | return 0; |
696 | } | |
697 | ||
0ade640e JL |
698 | static int |
699 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 700 | { |
0ade640e | 701 | int error; |
7ee1af76 | 702 | |
5853cc2a | 703 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 704 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
705 | if (error < 0) |
706 | return -ERESTARTSYS; | |
7ee1af76 | 707 | |
0ade640e | 708 | return 0; |
7ee1af76 JA |
709 | } |
710 | ||
fec344e3 JL |
711 | struct mid_q_entry * |
712 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
713 | { |
714 | int rc; | |
fec344e3 | 715 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
716 | struct mid_q_entry *mid; |
717 | ||
738f9de5 PS |
718 | if (rqst->rq_iov[0].iov_len != 4 || |
719 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
720 | return ERR_PTR(-EIO); | |
721 | ||
792af7b0 | 722 | /* enable signing if server requires it */ |
38d77c50 | 723 | if (server->sign) |
792af7b0 PS |
724 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
725 | ||
726 | mid = AllocMidQEntry(hdr, server); | |
727 | if (mid == NULL) | |
fec344e3 | 728 | return ERR_PTR(-ENOMEM); |
792af7b0 | 729 | |
fec344e3 | 730 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
731 | if (rc) { |
732 | DeleteMidQEntry(mid); | |
fec344e3 | 733 | return ERR_PTR(rc); |
ffc61ccb SP |
734 | } |
735 | ||
fec344e3 | 736 | return mid; |
792af7b0 | 737 | } |
133672ef | 738 | |
a6827c18 JL |
739 | /* |
740 | * Send a SMB request and set the callback function in the mid to handle | |
741 | * the result. Caller is responsible for dealing with timeouts. | |
742 | */ | |
743 | int | |
fec344e3 | 744 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 | 745 | mid_receive_t *receive, mid_callback_t *callback, |
3349c3a7 PS |
746 | mid_handle_t *handle, void *cbdata, const int flags, |
747 | const struct cifs_credits *exist_credits) | |
a6827c18 | 748 | { |
480b1cb9 | 749 | int rc; |
a6827c18 | 750 | struct mid_q_entry *mid; |
335b7b62 | 751 | struct cifs_credits credits = { .value = 0, .instance = 0 }; |
34f4deb7 | 752 | unsigned int instance; |
480b1cb9 | 753 | int optype; |
a6827c18 | 754 | |
a891f0f8 PS |
755 | optype = flags & CIFS_OP_MASK; |
756 | ||
cb7e9eab | 757 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
480b1cb9 | 758 | rc = wait_for_free_request(server, flags, &instance); |
cb7e9eab PS |
759 | if (rc) |
760 | return rc; | |
335b7b62 | 761 | credits.value = 1; |
34f4deb7 | 762 | credits.instance = instance; |
3349c3a7 PS |
763 | } else |
764 | instance = exist_credits->instance; | |
a6827c18 JL |
765 | |
766 | mutex_lock(&server->srv_mutex); | |
3349c3a7 PS |
767 | |
768 | /* | |
769 | * We can't use credits obtained from the previous session to send this | |
770 | * request. Check if there were reconnects after we obtained credits and | |
771 | * return -EAGAIN in such cases to let callers handle it. | |
772 | */ | |
773 | if (instance != server->reconnect_instance) { | |
774 | mutex_unlock(&server->srv_mutex); | |
775 | add_credits_and_wake_if(server, &credits, optype); | |
776 | return -EAGAIN; | |
777 | } | |
778 | ||
fec344e3 JL |
779 | mid = server->ops->setup_async_request(server, rqst); |
780 | if (IS_ERR(mid)) { | |
a6827c18 | 781 | mutex_unlock(&server->srv_mutex); |
335b7b62 | 782 | add_credits_and_wake_if(server, &credits, optype); |
fec344e3 | 783 | return PTR_ERR(mid); |
a6827c18 JL |
784 | } |
785 | ||
44d22d84 | 786 | mid->receive = receive; |
a6827c18 JL |
787 | mid->callback = callback; |
788 | mid->callback_data = cbdata; | |
9b7c18a2 | 789 | mid->handle = handle; |
7c9421e1 | 790 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 791 | |
ffc61ccb SP |
792 | /* put it on the pending_mid_q */ |
793 | spin_lock(&GlobalMid_Lock); | |
794 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
795 | spin_unlock(&GlobalMid_Lock); | |
796 | ||
93d2cb6c LL |
797 | /* |
798 | * Need to store the time in mid before calling I/O. For call_async, | |
799 | * I/O response may come back and free the mid entry on another thread. | |
800 | */ | |
801 | cifs_save_when_sent(mid); | |
789e6661 | 802 | cifs_in_send_inc(server); |
1f3a8f5f | 803 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 804 | cifs_in_send_dec(server); |
ad313cb8 | 805 | |
820962dc | 806 | if (rc < 0) { |
c781af7e | 807 | revert_current_mid(server, mid->credits); |
ad313cb8 | 808 | server->sequence_number -= 2; |
820962dc RV |
809 | cifs_delete_mid(mid); |
810 | } | |
811 | ||
a6827c18 | 812 | mutex_unlock(&server->srv_mutex); |
789e6661 | 813 | |
ffc61ccb SP |
814 | if (rc == 0) |
815 | return 0; | |
a6827c18 | 816 | |
335b7b62 | 817 | add_credits_and_wake_if(server, &credits, optype); |
a6827c18 JL |
818 | return rc; |
819 | } | |
820 | ||
133672ef SF |
821 | /* |
822 | * | |
823 | * Send an SMB Request. No response info (other than return code) | |
824 | * needs to be parsed. | |
825 | * | |
826 | * flags indicate the type of request buffer and how long to wait | |
827 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
828 | * | |
829 | */ | |
830 | int | |
96daf2b0 | 831 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 832 | char *in_buf, int flags) |
133672ef SF |
833 | { |
834 | int rc; | |
835 | struct kvec iov[1]; | |
da502f7d | 836 | struct kvec rsp_iov; |
133672ef SF |
837 | int resp_buf_type; |
838 | ||
792af7b0 PS |
839 | iov[0].iov_base = in_buf; |
840 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
392e1c5d | 841 | flags |= CIFS_NO_RSP_BUF; |
da502f7d | 842 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 843 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 844 | |
133672ef SF |
845 | return rc; |
846 | } | |
847 | ||
053d5034 | 848 | static int |
3c1105df | 849 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
850 | { |
851 | int rc = 0; | |
852 | ||
f96637be JP |
853 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
854 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 855 | |
74dd92a8 | 856 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 857 | switch (mid->mid_state) { |
74dd92a8 | 858 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
859 | spin_unlock(&GlobalMid_Lock); |
860 | return rc; | |
74dd92a8 JL |
861 | case MID_RETRY_NEEDED: |
862 | rc = -EAGAIN; | |
863 | break; | |
71823baf JL |
864 | case MID_RESPONSE_MALFORMED: |
865 | rc = -EIO; | |
866 | break; | |
3c1105df JL |
867 | case MID_SHUTDOWN: |
868 | rc = -EHOSTDOWN; | |
869 | break; | |
74dd92a8 | 870 | default: |
3c1105df | 871 | list_del_init(&mid->qhead); |
afe6f653 | 872 | cifs_server_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
f96637be | 873 | __func__, mid->mid, mid->mid_state); |
74dd92a8 | 874 | rc = -EIO; |
053d5034 JL |
875 | } |
876 | spin_unlock(&GlobalMid_Lock); | |
877 | ||
2b84a36c | 878 | DeleteMidQEntry(mid); |
053d5034 JL |
879 | return rc; |
880 | } | |
881 | ||
121b046a | 882 | static inline int |
fb2036d8 PS |
883 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
884 | struct mid_q_entry *mid) | |
76dcc26f | 885 | { |
121b046a | 886 | return server->ops->send_cancel ? |
fb2036d8 | 887 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
888 | } |
889 | ||
2c8f981d JL |
890 | int |
891 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
892 | bool log_error) | |
893 | { | |
792af7b0 | 894 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
895 | |
896 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
897 | |
898 | /* convert the length into a more usable form */ | |
38d77c50 | 899 | if (server->sign) { |
738f9de5 | 900 | struct kvec iov[2]; |
985e4ff0 | 901 | int rc = 0; |
738f9de5 PS |
902 | struct smb_rqst rqst = { .rq_iov = iov, |
903 | .rq_nvec = 2 }; | |
826a95e4 | 904 | |
738f9de5 PS |
905 | iov[0].iov_base = mid->resp_buf; |
906 | iov[0].iov_len = 4; | |
907 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
908 | iov[1].iov_len = len - 4; | |
2c8f981d | 909 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 910 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 911 | mid->sequence_number); |
985e4ff0 | 912 | if (rc) |
afe6f653 | 913 | cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n", |
f96637be | 914 | rc); |
2c8f981d JL |
915 | } |
916 | ||
917 | /* BB special case reconnect tid and uid here? */ | |
918 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
919 | } | |
920 | ||
fec344e3 JL |
921 | struct mid_q_entry * |
922 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
923 | { |
924 | int rc; | |
fec344e3 | 925 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
926 | struct mid_q_entry *mid; |
927 | ||
738f9de5 PS |
928 | if (rqst->rq_iov[0].iov_len != 4 || |
929 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
930 | return ERR_PTR(-EIO); | |
931 | ||
792af7b0 PS |
932 | rc = allocate_mid(ses, hdr, &mid); |
933 | if (rc) | |
fec344e3 JL |
934 | return ERR_PTR(rc); |
935 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
936 | if (rc) { | |
3c1bf7e4 | 937 | cifs_delete_mid(mid); |
fec344e3 JL |
938 | return ERR_PTR(rc); |
939 | } | |
940 | return mid; | |
792af7b0 PS |
941 | } |
942 | ||
4e34feb5 | 943 | static void |
ee258d79 | 944 | cifs_compound_callback(struct mid_q_entry *mid) |
8a26f0f7 PS |
945 | { |
946 | struct TCP_Server_Info *server = mid->server; | |
34f4deb7 PS |
947 | struct cifs_credits credits; |
948 | ||
949 | credits.value = server->ops->get_credits(mid); | |
950 | credits.instance = server->reconnect_instance; | |
8a26f0f7 | 951 | |
34f4deb7 | 952 | add_credits(server, &credits, mid->optype); |
8a26f0f7 PS |
953 | } |
954 | ||
ee258d79 PS |
955 | static void |
956 | cifs_compound_last_callback(struct mid_q_entry *mid) | |
957 | { | |
958 | cifs_compound_callback(mid); | |
959 | cifs_wake_up_task(mid); | |
960 | } | |
961 | ||
962 | static void | |
963 | cifs_cancelled_callback(struct mid_q_entry *mid) | |
964 | { | |
965 | cifs_compound_callback(mid); | |
966 | DeleteMidQEntry(mid); | |
967 | } | |
968 | ||
b8f57ee8 | 969 | int |
e0bba0b8 RS |
970 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
971 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
972 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 973 | { |
480b1cb9 | 974 | int i, j, optype, rc = 0; |
e0bba0b8 | 975 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
8544f4aa | 976 | bool cancelled_mid[MAX_COMPOUND] = {false}; |
34f4deb7 PS |
977 | struct cifs_credits credits[MAX_COMPOUND] = { |
978 | { .value = 0, .instance = 0 } | |
979 | }; | |
980 | unsigned int instance; | |
738f9de5 | 981 | char *buf; |
3190b59a | 982 | struct TCP_Server_Info *server; |
50c2f753 | 983 | |
a891f0f8 | 984 | optype = flags & CIFS_OP_MASK; |
133672ef | 985 | |
e0bba0b8 RS |
986 | for (i = 0; i < num_rqst; i++) |
987 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
988 | |
989 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 990 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
991 | return -EIO; |
992 | } | |
993 | ||
3190b59a AA |
994 | server = ses->server; |
995 | if (server->tcpStatus == CifsExiting) | |
7ee1af76 | 996 | return -ENOENT; |
7ee1af76 | 997 | |
792af7b0 | 998 | /* |
257b7809 | 999 | * Wait for all the requests to become available. |
7091bcab PS |
1000 | * This approach still leaves the possibility to be stuck waiting for |
1001 | * credits if the server doesn't grant credits to the outstanding | |
257b7809 RS |
1002 | * requests and if the client is completely idle, not generating any |
1003 | * other requests. | |
1004 | * This can be handled by the eventual session reconnect. | |
792af7b0 | 1005 | */ |
3190b59a | 1006 | rc = wait_for_compound_request(server, num_rqst, flags, |
257b7809 RS |
1007 | &instance); |
1008 | if (rc) | |
1009 | return rc; | |
97ea4998 | 1010 | |
257b7809 RS |
1011 | for (i = 0; i < num_rqst; i++) { |
1012 | credits[i].value = 1; | |
1013 | credits[i].instance = instance; | |
8544f4aa | 1014 | } |
7ee1af76 | 1015 | |
792af7b0 PS |
1016 | /* |
1017 | * Make sure that we sign in the same order that we send on this socket | |
1018 | * and avoid races inside tcp sendmsg code that could cause corruption | |
1019 | * of smb data. | |
1020 | */ | |
7ee1af76 | 1021 | |
3190b59a | 1022 | mutex_lock(&server->srv_mutex); |
7ee1af76 | 1023 | |
97ea4998 PS |
1024 | /* |
1025 | * All the parts of the compound chain belong obtained credits from the | |
257b7809 | 1026 | * same session. We can not use credits obtained from the previous |
97ea4998 PS |
1027 | * session to send this request. Check if there were reconnects after |
1028 | * we obtained credits and return -EAGAIN in such cases to let callers | |
1029 | * handle it. | |
1030 | */ | |
3190b59a AA |
1031 | if (instance != server->reconnect_instance) { |
1032 | mutex_unlock(&server->srv_mutex); | |
97ea4998 | 1033 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1034 | add_credits(server, &credits[j], optype); |
97ea4998 PS |
1035 | return -EAGAIN; |
1036 | } | |
1037 | ||
e0bba0b8 | 1038 | for (i = 0; i < num_rqst; i++) { |
3190b59a | 1039 | midQ[i] = server->ops->setup_request(ses, &rqst[i]); |
e0bba0b8 | 1040 | if (IS_ERR(midQ[i])) { |
3190b59a | 1041 | revert_current_mid(server, i); |
e0bba0b8 RS |
1042 | for (j = 0; j < i; j++) |
1043 | cifs_delete_mid(midQ[j]); | |
3190b59a | 1044 | mutex_unlock(&server->srv_mutex); |
8544f4aa | 1045 | |
e0bba0b8 | 1046 | /* Update # of requests on wire to server */ |
8544f4aa | 1047 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1048 | add_credits(server, &credits[j], optype); |
e0bba0b8 RS |
1049 | return PTR_ERR(midQ[i]); |
1050 | } | |
1051 | ||
1052 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
8a26f0f7 | 1053 | midQ[i]->optype = optype; |
4e34feb5 | 1054 | /* |
ee258d79 PS |
1055 | * Invoke callback for every part of the compound chain |
1056 | * to calculate credits properly. Wake up this thread only when | |
1057 | * the last element is received. | |
4e34feb5 RS |
1058 | */ |
1059 | if (i < num_rqst - 1) | |
ee258d79 PS |
1060 | midQ[i]->callback = cifs_compound_callback; |
1061 | else | |
1062 | midQ[i]->callback = cifs_compound_last_callback; | |
1da177e4 | 1063 | } |
3190b59a AA |
1064 | cifs_in_send_inc(server); |
1065 | rc = smb_send_rqst(server, num_rqst, rqst, flags); | |
1066 | cifs_in_send_dec(server); | |
e0bba0b8 RS |
1067 | |
1068 | for (i = 0; i < num_rqst; i++) | |
1069 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 1070 | |
c781af7e | 1071 | if (rc < 0) { |
3190b59a AA |
1072 | revert_current_mid(server, num_rqst); |
1073 | server->sequence_number -= 2; | |
c781af7e | 1074 | } |
e0bba0b8 | 1075 | |
3190b59a | 1076 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1077 | |
d69cb728 RS |
1078 | /* |
1079 | * If sending failed for some reason or it is an oplock break that we | |
1080 | * will not receive a response to - return credits back | |
1081 | */ | |
1082 | if (rc < 0 || (flags & CIFS_NO_SRV_RSP)) { | |
ee258d79 | 1083 | for (i = 0; i < num_rqst; i++) |
3190b59a | 1084 | add_credits(server, &credits[i], optype); |
cb5c2e63 | 1085 | goto out; |
ee258d79 PS |
1086 | } |
1087 | ||
1088 | /* | |
1089 | * At this point the request is passed to the network stack - we assume | |
1090 | * that any credits taken from the server structure on the client have | |
1091 | * been spent and we can't return them back. Once we receive responses | |
1092 | * we will collect credits granted by the server in the mid callbacks | |
1093 | * and add those credits to the server structure. | |
1094 | */ | |
e0bba0b8 | 1095 | |
cb5c2e63 RS |
1096 | /* |
1097 | * Compounding is never used during session establish. | |
1098 | */ | |
1099 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
1100 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, | |
1101 | rqst[0].rq_nvec); | |
e0bba0b8 | 1102 | |
cb5c2e63 | 1103 | for (i = 0; i < num_rqst; i++) { |
3190b59a | 1104 | rc = wait_for_response(server, midQ[i]); |
8a26f0f7 PS |
1105 | if (rc != 0) |
1106 | break; | |
1107 | } | |
1108 | if (rc != 0) { | |
1109 | for (; i < num_rqst; i++) { | |
afe6f653 | 1110 | cifs_server_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", |
43de1db3 | 1111 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); |
3190b59a | 1112 | send_cancel(server, &rqst[i], midQ[i]); |
e0bba0b8 RS |
1113 | spin_lock(&GlobalMid_Lock); |
1114 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
1115 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
8a26f0f7 | 1116 | midQ[i]->callback = cifs_cancelled_callback; |
8544f4aa | 1117 | cancelled_mid[i] = true; |
34f4deb7 | 1118 | credits[i].value = 0; |
e0bba0b8 | 1119 | } |
1be912dd | 1120 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 1121 | } |
cb5c2e63 RS |
1122 | } |
1123 | ||
cb5c2e63 RS |
1124 | for (i = 0; i < num_rqst; i++) { |
1125 | if (rc < 0) | |
1126 | goto out; | |
e0bba0b8 | 1127 | |
3190b59a | 1128 | rc = cifs_sync_mid_result(midQ[i], server); |
e0bba0b8 | 1129 | if (rc != 0) { |
8544f4aa PS |
1130 | /* mark this mid as cancelled to not free it below */ |
1131 | cancelled_mid[i] = true; | |
1132 | goto out; | |
1be912dd | 1133 | } |
2b2bdfba | 1134 | |
e0bba0b8 RS |
1135 | if (!midQ[i]->resp_buf || |
1136 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
1137 | rc = -EIO; | |
1138 | cifs_dbg(FYI, "Bad MID state?\n"); | |
1139 | goto out; | |
1140 | } | |
a891f0f8 | 1141 | |
e0bba0b8 RS |
1142 | buf = (char *)midQ[i]->resp_buf; |
1143 | resp_iov[i].iov_base = buf; | |
1144 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
3190b59a | 1145 | server->vals->header_preamble_size; |
e0bba0b8 RS |
1146 | |
1147 | if (midQ[i]->large_buf) | |
1148 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
1149 | else | |
1150 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
1151 | ||
3190b59a | 1152 | rc = server->ops->check_receive(midQ[i], server, |
e0bba0b8 | 1153 | flags & CIFS_LOG_ERROR); |
1da177e4 | 1154 | |
e0bba0b8 | 1155 | /* mark it so buf will not be freed by cifs_delete_mid */ |
392e1c5d | 1156 | if ((flags & CIFS_NO_RSP_BUF) == 0) |
e0bba0b8 | 1157 | midQ[i]->resp_buf = NULL; |
cb5c2e63 | 1158 | |
e0bba0b8 | 1159 | } |
cb5c2e63 RS |
1160 | |
1161 | /* | |
1162 | * Compounding is never used during session establish. | |
1163 | */ | |
1164 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
1165 | struct kvec iov = { | |
1166 | .iov_base = resp_iov[0].iov_base, | |
1167 | .iov_len = resp_iov[0].iov_len | |
1168 | }; | |
1169 | smb311_update_preauth_hash(ses, &iov, 1); | |
1170 | } | |
1171 | ||
7ee1af76 | 1172 | out: |
4e34feb5 RS |
1173 | /* |
1174 | * This will dequeue all mids. After this it is important that the | |
1175 | * demultiplex_thread will not process any of these mids any futher. | |
1176 | * This is prevented above by using a noop callback that will not | |
1177 | * wake this thread except for the very last PDU. | |
1178 | */ | |
8544f4aa PS |
1179 | for (i = 0; i < num_rqst; i++) { |
1180 | if (!cancelled_mid[i]) | |
1181 | cifs_delete_mid(midQ[i]); | |
8544f4aa | 1182 | } |
1da177e4 | 1183 | |
d6e04ae6 SF |
1184 | return rc; |
1185 | } | |
1da177e4 | 1186 | |
e0bba0b8 RS |
1187 | int |
1188 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
1189 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
1190 | struct kvec *resp_iov) | |
1191 | { | |
1192 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
1193 | resp_iov); | |
1194 | } | |
1195 | ||
738f9de5 PS |
1196 | int |
1197 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
1198 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
1199 | const int flags, struct kvec *resp_iov) | |
1200 | { | |
1201 | struct smb_rqst rqst; | |
3cecf486 | 1202 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
1203 | int rc; |
1204 | ||
3cecf486 | 1205 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
1206 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
1207 | GFP_KERNEL); | |
117e3b7f SF |
1208 | if (!new_iov) { |
1209 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
1210 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 1211 | return -ENOMEM; |
117e3b7f | 1212 | } |
3cecf486 RS |
1213 | } else |
1214 | new_iov = s_iov; | |
738f9de5 PS |
1215 | |
1216 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
1217 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
1218 | ||
1219 | new_iov[0].iov_base = new_iov[1].iov_base; | |
1220 | new_iov[0].iov_len = 4; | |
1221 | new_iov[1].iov_base += 4; | |
1222 | new_iov[1].iov_len -= 4; | |
1223 | ||
1224 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
1225 | rqst.rq_iov = new_iov; | |
1226 | rqst.rq_nvec = n_vec + 1; | |
1227 | ||
1228 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1229 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1230 | kfree(new_iov); | |
738f9de5 PS |
1231 | return rc; |
1232 | } | |
1233 | ||
1da177e4 | 1234 | int |
96daf2b0 | 1235 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1236 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
480b1cb9 | 1237 | int *pbytes_returned, const int flags) |
1da177e4 LT |
1238 | { |
1239 | int rc = 0; | |
1da177e4 | 1240 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1241 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1242 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1243 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1244 | struct cifs_credits credits = { .value = 1, .instance = 0 }; |
ac6ad7a8 | 1245 | struct TCP_Server_Info *server; |
1da177e4 LT |
1246 | |
1247 | if (ses == NULL) { | |
f96637be | 1248 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1249 | return -EIO; |
1250 | } | |
ac6ad7a8 | 1251 | server = ses->server; |
afe6f653 | 1252 | if (server == NULL) { |
f96637be | 1253 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1254 | return -EIO; |
1255 | } | |
1256 | ||
afe6f653 | 1257 | if (server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1258 | return -ENOENT; |
1259 | ||
79a58d1f | 1260 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1261 | to the same server. We may make this configurable later or |
1262 | use ses->maxReq */ | |
1da177e4 | 1263 | |
fb2036d8 | 1264 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
afe6f653 | 1265 | cifs_server_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1266 | len); |
6d9c6d54 VL |
1267 | return -EIO; |
1268 | } | |
1269 | ||
afe6f653 | 1270 | rc = wait_for_free_request(server, flags, &credits.instance); |
7ee1af76 JA |
1271 | if (rc) |
1272 | return rc; | |
1273 | ||
79a58d1f | 1274 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1275 | and avoid races inside tcp sendmsg code that could cause corruption |
1276 | of smb data */ | |
1277 | ||
afe6f653 | 1278 | mutex_lock(&server->srv_mutex); |
1da177e4 | 1279 | |
7ee1af76 JA |
1280 | rc = allocate_mid(ses, in_buf, &midQ); |
1281 | if (rc) { | |
72ca545b | 1282 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1283 | /* Update # of requests on wire to server */ |
afe6f653 | 1284 | add_credits(server, &credits, 0); |
7ee1af76 | 1285 | return rc; |
1da177e4 LT |
1286 | } |
1287 | ||
afe6f653 | 1288 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1289 | if (rc) { |
afe6f653 | 1290 | mutex_unlock(&server->srv_mutex); |
829049cb VL |
1291 | goto out; |
1292 | } | |
1da177e4 | 1293 | |
7c9421e1 | 1294 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1295 | |
afe6f653 RS |
1296 | cifs_in_send_inc(server); |
1297 | rc = smb_send(server, in_buf, len); | |
1298 | cifs_in_send_dec(server); | |
789e6661 | 1299 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1300 | |
1301 | if (rc < 0) | |
afe6f653 | 1302 | server->sequence_number -= 2; |
ad313cb8 | 1303 | |
afe6f653 | 1304 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1305 | |
79a58d1f | 1306 | if (rc < 0) |
7ee1af76 JA |
1307 | goto out; |
1308 | ||
afe6f653 | 1309 | rc = wait_for_response(server, midQ); |
1be912dd | 1310 | if (rc != 0) { |
afe6f653 | 1311 | send_cancel(server, &rqst, midQ); |
1be912dd | 1312 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1313 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1314 | /* no longer considered to be "in-flight" */ |
1315 | midQ->callback = DeleteMidQEntry; | |
1316 | spin_unlock(&GlobalMid_Lock); | |
afe6f653 | 1317 | add_credits(server, &credits, 0); |
1be912dd JL |
1318 | return rc; |
1319 | } | |
1320 | spin_unlock(&GlobalMid_Lock); | |
1321 | } | |
1da177e4 | 1322 | |
afe6f653 | 1323 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1324 | if (rc != 0) { |
afe6f653 | 1325 | add_credits(server, &credits, 0); |
1da177e4 LT |
1326 | return rc; |
1327 | } | |
50c2f753 | 1328 | |
2c8f981d | 1329 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1330 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1331 | rc = -EIO; |
afe6f653 | 1332 | cifs_server_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1333 | goto out; |
1da177e4 | 1334 | } |
7ee1af76 | 1335 | |
d4e4854f | 1336 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1337 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1338 | rc = cifs_check_receive(midQ, server, 0); |
7ee1af76 | 1339 | out: |
3c1bf7e4 | 1340 | cifs_delete_mid(midQ); |
afe6f653 | 1341 | add_credits(server, &credits, 0); |
1da177e4 | 1342 | |
7ee1af76 JA |
1343 | return rc; |
1344 | } | |
1da177e4 | 1345 | |
7ee1af76 JA |
1346 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1347 | blocking lock to return. */ | |
1348 | ||
1349 | static int | |
96daf2b0 | 1350 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1351 | struct smb_hdr *in_buf, |
1352 | struct smb_hdr *out_buf) | |
1353 | { | |
1354 | int bytes_returned; | |
96daf2b0 | 1355 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1356 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1357 | ||
1358 | /* We just modify the current in_buf to change | |
1359 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1360 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1361 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1362 | ||
1363 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1364 | pSMB->Timeout = 0; | |
88257360 | 1365 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1366 | |
1367 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1368 | &bytes_returned, 0); |
7ee1af76 JA |
1369 | } |
1370 | ||
1371 | int | |
96daf2b0 | 1372 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1373 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1374 | int *pbytes_returned) | |
1375 | { | |
1376 | int rc = 0; | |
1377 | int rstart = 0; | |
7ee1af76 | 1378 | struct mid_q_entry *midQ; |
96daf2b0 | 1379 | struct cifs_ses *ses; |
fb2036d8 PS |
1380 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1381 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1382 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1383 | unsigned int instance; |
afe6f653 | 1384 | struct TCP_Server_Info *server; |
7ee1af76 JA |
1385 | |
1386 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1387 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1388 | return -EIO; |
1389 | } | |
1390 | ses = tcon->ses; | |
afe6f653 | 1391 | server = ses->server; |
7ee1af76 | 1392 | |
afe6f653 | 1393 | if (server == NULL) { |
f96637be | 1394 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1395 | return -EIO; |
1396 | } | |
1397 | ||
afe6f653 | 1398 | if (server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1399 | return -ENOENT; |
1400 | ||
79a58d1f | 1401 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1402 | to the same server. We may make this configurable later or |
1403 | use ses->maxReq */ | |
1404 | ||
fb2036d8 | 1405 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
afe6f653 | 1406 | cifs_server_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1407 | len); |
6d9c6d54 VL |
1408 | return -EIO; |
1409 | } | |
1410 | ||
afe6f653 | 1411 | rc = wait_for_free_request(server, CIFS_BLOCKING_OP, &instance); |
7ee1af76 JA |
1412 | if (rc) |
1413 | return rc; | |
1414 | ||
79a58d1f | 1415 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1416 | and avoid races inside tcp sendmsg code that could cause corruption |
1417 | of smb data */ | |
1418 | ||
afe6f653 | 1419 | mutex_lock(&server->srv_mutex); |
7ee1af76 JA |
1420 | |
1421 | rc = allocate_mid(ses, in_buf, &midQ); | |
1422 | if (rc) { | |
afe6f653 | 1423 | mutex_unlock(&server->srv_mutex); |
7ee1af76 JA |
1424 | return rc; |
1425 | } | |
1426 | ||
afe6f653 | 1427 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1428 | if (rc) { |
3c1bf7e4 | 1429 | cifs_delete_mid(midQ); |
afe6f653 | 1430 | mutex_unlock(&server->srv_mutex); |
829049cb VL |
1431 | return rc; |
1432 | } | |
1da177e4 | 1433 | |
7c9421e1 | 1434 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
afe6f653 RS |
1435 | cifs_in_send_inc(server); |
1436 | rc = smb_send(server, in_buf, len); | |
1437 | cifs_in_send_dec(server); | |
789e6661 | 1438 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1439 | |
1440 | if (rc < 0) | |
afe6f653 | 1441 | server->sequence_number -= 2; |
ad313cb8 | 1442 | |
afe6f653 | 1443 | mutex_unlock(&server->srv_mutex); |
7ee1af76 | 1444 | |
79a58d1f | 1445 | if (rc < 0) { |
3c1bf7e4 | 1446 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1447 | return rc; |
1448 | } | |
1449 | ||
1450 | /* Wait for a reply - allow signals to interrupt. */ | |
afe6f653 | 1451 | rc = wait_event_interruptible(server->response_q, |
7c9421e1 | 1452 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
afe6f653 RS |
1453 | ((server->tcpStatus != CifsGood) && |
1454 | (server->tcpStatus != CifsNew))); | |
7ee1af76 JA |
1455 | |
1456 | /* Were we interrupted by a signal ? */ | |
1457 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1458 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
afe6f653 RS |
1459 | ((server->tcpStatus == CifsGood) || |
1460 | (server->tcpStatus == CifsNew))) { | |
7ee1af76 JA |
1461 | |
1462 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1463 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1464 | blocking lock to return. */ | |
afe6f653 | 1465 | rc = send_cancel(server, &rqst, midQ); |
7ee1af76 | 1466 | if (rc) { |
3c1bf7e4 | 1467 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1468 | return rc; |
1469 | } | |
1470 | } else { | |
1471 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1472 | to cause the blocking lock to return. */ | |
1473 | ||
1474 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1475 | ||
1476 | /* If we get -ENOLCK back the lock may have | |
1477 | already been removed. Don't exit in this case. */ | |
1478 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1479 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1480 | return rc; |
1481 | } | |
1482 | } | |
1483 | ||
afe6f653 | 1484 | rc = wait_for_response(server, midQ); |
1be912dd | 1485 | if (rc) { |
afe6f653 | 1486 | send_cancel(server, &rqst, midQ); |
1be912dd | 1487 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1488 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1489 | /* no longer considered to be "in-flight" */ |
1490 | midQ->callback = DeleteMidQEntry; | |
1491 | spin_unlock(&GlobalMid_Lock); | |
1492 | return rc; | |
1493 | } | |
1494 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1495 | } |
1be912dd JL |
1496 | |
1497 | /* We got the response - restart system call. */ | |
1498 | rstart = 1; | |
7ee1af76 JA |
1499 | } |
1500 | ||
afe6f653 | 1501 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1502 | if (rc != 0) |
7ee1af76 | 1503 | return rc; |
50c2f753 | 1504 | |
17c8bfed | 1505 | /* rcvd frame is ok */ |
7c9421e1 | 1506 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1507 | rc = -EIO; |
afe6f653 | 1508 | cifs_server_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1509 | goto out; |
1510 | } | |
1da177e4 | 1511 | |
d4e4854f | 1512 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1513 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1514 | rc = cifs_check_receive(midQ, server, 0); |
17c8bfed | 1515 | out: |
3c1bf7e4 | 1516 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1517 | if (rstart && rc == -EACCES) |
1518 | return -ERESTARTSYS; | |
1da177e4 LT |
1519 | return rc; |
1520 | } |