Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
b8eed283 | 30 | #include <linux/tcp.h> |
2f8b5444 | 31 | #include <linux/bvec.h> |
97bc00b3 | 32 | #include <linux/highmem.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/processor.h> |
35 | #include <linux/mempool.h> | |
36 | #include "cifspdu.h" | |
37 | #include "cifsglob.h" | |
38 | #include "cifsproto.h" | |
39 | #include "cifs_debug.h" | |
8bd68c6e | 40 | #include "smb2proto.h" |
9762c2d0 | 41 | #include "smbdirect.h" |
50c2f753 | 42 | |
3cecf486 RS |
43 | /* Max number of iovectors we can use off the stack when sending requests. */ |
44 | #define CIFS_MAX_IOV_SIZE 8 | |
45 | ||
2dc7e1c0 PS |
46 | void |
47 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
48 | { |
49 | wake_up_process(mid->callback_data); | |
50 | } | |
51 | ||
a6827c18 | 52 | struct mid_q_entry * |
24b9b06b | 53 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
54 | { |
55 | struct mid_q_entry *temp; | |
56 | ||
24b9b06b | 57 | if (server == NULL) { |
f96637be | 58 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
1da177e4 LT |
59 | return NULL; |
60 | } | |
50c2f753 | 61 | |
232087cb | 62 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
a6f74e80 | 63 | memset(temp, 0, sizeof(struct mid_q_entry)); |
696e420b | 64 | kref_init(&temp->refcount); |
a6f74e80 N |
65 | temp->mid = get_mid(smb_buffer); |
66 | temp->pid = current->pid; | |
67 | temp->command = cpu_to_le16(smb_buffer->Command); | |
68 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 69 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
70 | /* when mid allocated can be before when sent */ |
71 | temp->when_alloc = jiffies; | |
72 | temp->server = server; | |
2b84a36c | 73 | |
a6f74e80 N |
74 | /* |
75 | * The default is for the mid to be synchronous, so the | |
76 | * default callback just wakes up the current task. | |
77 | */ | |
78 | temp->callback = cifs_wake_up_task; | |
79 | temp->callback_data = current; | |
1da177e4 | 80 | |
1da177e4 | 81 | atomic_inc(&midCount); |
7c9421e1 | 82 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
83 | return temp; |
84 | } | |
85 | ||
696e420b LP |
86 | static void _cifs_mid_q_entry_release(struct kref *refcount) |
87 | { | |
88 | struct mid_q_entry *mid = container_of(refcount, struct mid_q_entry, | |
89 | refcount); | |
90 | ||
91 | mempool_free(mid, cifs_mid_poolp); | |
92 | } | |
93 | ||
94 | void cifs_mid_q_entry_release(struct mid_q_entry *midEntry) | |
95 | { | |
96 | spin_lock(&GlobalMid_Lock); | |
97 | kref_put(&midEntry->refcount, _cifs_mid_q_entry_release); | |
98 | spin_unlock(&GlobalMid_Lock); | |
99 | } | |
100 | ||
766fdbb5 | 101 | void |
1da177e4 LT |
102 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
103 | { | |
1047abc1 | 104 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 105 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
106 | unsigned long now; |
107 | #endif | |
7c9421e1 | 108 | midEntry->mid_state = MID_FREE; |
8097531a | 109 | atomic_dec(&midCount); |
7c9421e1 | 110 | if (midEntry->large_buf) |
b8643e1b SF |
111 | cifs_buf_release(midEntry->resp_buf); |
112 | else | |
113 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
114 | #ifdef CONFIG_CIFS_STATS2 |
115 | now = jiffies; | |
00778e22 SF |
116 | /* |
117 | * commands taking longer than one second (default) can be indications | |
118 | * that something is wrong, unless it is quite a slow link or a very | |
119 | * busy server. Note that this calc is unlikely or impossible to wrap | |
120 | * as long as slow_rsp_threshold is not set way above recommended max | |
121 | * value (32767 ie 9 hours) and is generally harmless even if wrong | |
122 | * since only affects debug counters - so leaving the calc as simple | |
123 | * comparison rather than doing multiple conversions and overflow | |
124 | * checks | |
125 | */ | |
126 | if ((slow_rsp_threshold != 0) && | |
127 | time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && | |
020eec5f | 128 | (midEntry->command != command)) { |
f5942db5 SF |
129 | /* |
130 | * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command | |
131 | * NB: le16_to_cpu returns unsigned so can not be negative below | |
132 | */ | |
133 | if (le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) | |
468d6779 SF |
134 | cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]); |
135 | ||
020eec5f SF |
136 | trace_smb3_slow_rsp(le16_to_cpu(midEntry->command), |
137 | midEntry->mid, midEntry->pid, | |
138 | midEntry->when_sent, midEntry->when_received); | |
139 | if (cifsFYI & CIFS_TIMER) { | |
0b456f04 | 140 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 141 | midEntry->command, midEntry->mid); |
f80eaedd | 142 | cifs_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
143 | now - midEntry->when_alloc, |
144 | now - midEntry->when_sent, | |
145 | now - midEntry->when_received); | |
146 | } | |
147 | } | |
148 | #endif | |
696e420b | 149 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
150 | } |
151 | ||
3c1bf7e4 PS |
152 | void |
153 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
154 | { |
155 | spin_lock(&GlobalMid_Lock); | |
ddf83afb RS |
156 | list_del_init(&mid->qhead); |
157 | mid->mid_flags |= MID_DELETED; | |
ddc8cf8f JL |
158 | spin_unlock(&GlobalMid_Lock); |
159 | ||
160 | DeleteMidQEntry(mid); | |
161 | } | |
162 | ||
6f49f46b JL |
163 | /* |
164 | * smb_send_kvec - send an array of kvecs to the server | |
165 | * @server: Server to send the data to | |
3ab3f2a1 | 166 | * @smb_msg: Message to send |
6f49f46b JL |
167 | * @sent: amount of data sent on socket is stored here |
168 | * | |
169 | * Our basic "send data to server" function. Should be called with srv_mutex | |
170 | * held. The caller is responsible for handling the results. | |
171 | */ | |
d6e04ae6 | 172 | static int |
3ab3f2a1 AV |
173 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
174 | size_t *sent) | |
1da177e4 LT |
175 | { |
176 | int rc = 0; | |
3ab3f2a1 | 177 | int retries = 0; |
edf1ae40 | 178 | struct socket *ssocket = server->ssocket; |
50c2f753 | 179 | |
6f49f46b JL |
180 | *sent = 0; |
181 | ||
3ab3f2a1 AV |
182 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
183 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
184 | smb_msg->msg_control = NULL; | |
185 | smb_msg->msg_controllen = 0; | |
0496e02d | 186 | if (server->noblocksnd) |
3ab3f2a1 | 187 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 188 | else |
3ab3f2a1 | 189 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 190 | |
3ab3f2a1 | 191 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
192 | /* |
193 | * If blocking send, we try 3 times, since each can block | |
194 | * for 5 seconds. For nonblocking we have to try more | |
195 | * but wait increasing amounts of time allowing time for | |
196 | * socket to clear. The overall time we wait in either | |
197 | * case to send on the socket is about 15 seconds. | |
198 | * Similarly we wait for 15 seconds for a response from | |
199 | * the server in SendReceive[2] for the server to send | |
200 | * a response back for most types of requests (except | |
201 | * SMB Write past end of file which can be slow, and | |
202 | * blocking lock operations). NFS waits slightly longer | |
203 | * than CIFS, but this can make it take longer for | |
204 | * nonresponsive servers to be detected and 15 seconds | |
205 | * is more than enough time for modern networks to | |
206 | * send a packet. In most cases if we fail to send | |
207 | * after the retries we will kill the socket and | |
208 | * reconnect which may clear the network problem. | |
209 | */ | |
3ab3f2a1 | 210 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 211 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
212 | retries++; |
213 | if (retries >= 14 || | |
214 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
215 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
216 | ssocket); | |
3ab3f2a1 | 217 | return -EAGAIN; |
1da177e4 | 218 | } |
3ab3f2a1 | 219 | msleep(1 << retries); |
1da177e4 LT |
220 | continue; |
221 | } | |
6f49f46b | 222 | |
79a58d1f | 223 | if (rc < 0) |
3ab3f2a1 | 224 | return rc; |
6f49f46b | 225 | |
79a58d1f | 226 | if (rc == 0) { |
3e84469d SF |
227 | /* should never happen, letting socket clear before |
228 | retrying is our only obvious option here */ | |
f96637be | 229 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
230 | msleep(500); |
231 | continue; | |
d6e04ae6 | 232 | } |
6f49f46b | 233 | |
3ab3f2a1 AV |
234 | /* send was at least partially successful */ |
235 | *sent += rc; | |
236 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 237 | } |
3ab3f2a1 | 238 | return 0; |
97bc00b3 JL |
239 | } |
240 | ||
35e2cc1b | 241 | unsigned long |
81f39f95 | 242 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
243 | { |
244 | unsigned int i; | |
35e2cc1b PA |
245 | struct kvec *iov; |
246 | int nvec; | |
a26054d1 JL |
247 | unsigned long buflen = 0; |
248 | ||
81f39f95 RS |
249 | if (server->vals->header_preamble_size == 0 && |
250 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
251 | iov = &rqst->rq_iov[1]; |
252 | nvec = rqst->rq_nvec - 1; | |
253 | } else { | |
254 | iov = rqst->rq_iov; | |
255 | nvec = rqst->rq_nvec; | |
256 | } | |
257 | ||
a26054d1 | 258 | /* total up iov array first */ |
35e2cc1b | 259 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
260 | buflen += iov[i].iov_len; |
261 | ||
c06a0f2d LL |
262 | /* |
263 | * Add in the page array if there is one. The caller needs to make | |
264 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
265 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
266 | * PAGE_SIZE. | |
267 | */ | |
a26054d1 | 268 | if (rqst->rq_npages) { |
c06a0f2d LL |
269 | if (rqst->rq_npages == 1) |
270 | buflen += rqst->rq_tailsz; | |
271 | else { | |
272 | /* | |
273 | * If there is more than one page, calculate the | |
274 | * buffer length based on rq_offset and rq_tailsz | |
275 | */ | |
276 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
277 | rqst->rq_offset; | |
278 | buflen += rqst->rq_tailsz; | |
279 | } | |
a26054d1 JL |
280 | } |
281 | ||
282 | return buflen; | |
283 | } | |
284 | ||
6f49f46b | 285 | static int |
07cd952f RS |
286 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
287 | struct smb_rqst *rqst) | |
6f49f46b | 288 | { |
07cd952f RS |
289 | int rc = 0; |
290 | struct kvec *iov; | |
291 | int n_vec; | |
292 | unsigned int send_length = 0; | |
293 | unsigned int i, j; | |
3ab3f2a1 | 294 | size_t total_len = 0, sent, size; |
b8eed283 | 295 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 296 | struct msghdr smb_msg; |
b8eed283 | 297 | int val = 1; |
c713c877 RS |
298 | __be32 rfc1002_marker; |
299 | ||
9762c2d0 | 300 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
81f39f95 | 301 | rc = smbd_send(server, rqst); |
9762c2d0 LL |
302 | goto smbd_done; |
303 | } | |
ea702b80 JL |
304 | if (ssocket == NULL) |
305 | return -ENOTSOCK; | |
306 | ||
b8eed283 JL |
307 | /* cork the socket */ |
308 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
309 | (char *)&val, sizeof(val)); | |
310 | ||
07cd952f | 311 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 312 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
313 | rfc1002_marker = cpu_to_be32(send_length); |
314 | ||
c713c877 RS |
315 | /* Generate a rfc1002 marker for SMB2+ */ |
316 | if (server->vals->header_preamble_size == 0) { | |
317 | struct kvec hiov = { | |
318 | .iov_base = &rfc1002_marker, | |
319 | .iov_len = 4 | |
320 | }; | |
aa563d7b | 321 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
322 | rc = smb_send_kvec(server, &smb_msg, &sent); |
323 | if (rc < 0) | |
324 | goto uncork; | |
325 | ||
326 | total_len += sent; | |
327 | send_length += 4; | |
328 | } | |
329 | ||
662bf5bc PA |
330 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
331 | ||
07cd952f RS |
332 | for (j = 0; j < num_rqst; j++) { |
333 | iov = rqst[j].rq_iov; | |
334 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 335 | |
07cd952f | 336 | size = 0; |
662bf5bc PA |
337 | for (i = 0; i < n_vec; i++) { |
338 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 339 | size += iov[i].iov_len; |
662bf5bc | 340 | } |
97bc00b3 | 341 | |
aa563d7b | 342 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 343 | |
3ab3f2a1 | 344 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 345 | if (rc < 0) |
07cd952f | 346 | goto uncork; |
97bc00b3 JL |
347 | |
348 | total_len += sent; | |
07cd952f RS |
349 | |
350 | /* now walk the page array and send each page in it */ | |
351 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
352 | struct bio_vec bvec; | |
353 | ||
354 | bvec.bv_page = rqst[j].rq_pages[i]; | |
355 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
356 | &bvec.bv_offset); | |
357 | ||
aa563d7b | 358 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
359 | &bvec, 1, bvec.bv_len); |
360 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
361 | if (rc < 0) | |
362 | break; | |
363 | ||
364 | total_len += sent; | |
365 | } | |
97bc00b3 | 366 | } |
1da177e4 | 367 | |
97bc00b3 | 368 | uncork: |
b8eed283 JL |
369 | /* uncork it */ |
370 | val = 0; | |
371 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
372 | (char *)&val, sizeof(val)); | |
373 | ||
c713c877 | 374 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 375 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 376 | send_length, total_len); |
6f49f46b JL |
377 | /* |
378 | * If we have only sent part of an SMB then the next SMB could | |
379 | * be taken as the remainder of this one. We need to kill the | |
380 | * socket so the server throws away the partial SMB | |
381 | */ | |
edf1ae40 | 382 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
383 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
384 | server->hostname); | |
edf1ae40 | 385 | } |
9762c2d0 | 386 | smbd_done: |
d804d41d | 387 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
388 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
389 | rc); | |
ee13919c | 390 | else if (rc > 0) |
1da177e4 | 391 | rc = 0; |
1da177e4 LT |
392 | |
393 | return rc; | |
394 | } | |
395 | ||
6f49f46b | 396 | static int |
1f3a8f5f RS |
397 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
398 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 399 | { |
b2c96de7 RS |
400 | struct kvec iov; |
401 | struct smb2_transform_hdr tr_hdr; | |
402 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
403 | int rc; |
404 | ||
405 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
406 | return __smb_send_rqst(server, num_rqst, rqst); |
407 | ||
408 | if (num_rqst > MAX_COMPOUND - 1) | |
409 | return -ENOMEM; | |
7fb8986e | 410 | |
b2c96de7 RS |
411 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
412 | memset(&iov, 0, sizeof(iov)); | |
413 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
414 | ||
415 | iov.iov_base = &tr_hdr; | |
416 | iov.iov_len = sizeof(tr_hdr); | |
417 | cur_rqst[0].rq_iov = &iov; | |
418 | cur_rqst[0].rq_nvec = 1; | |
419 | ||
420 | if (!server->ops->init_transform_rq) { | |
421 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
422 | "is missing\n"); | |
7fb8986e PS |
423 | return -EIO; |
424 | } | |
6f49f46b | 425 | |
1f3a8f5f RS |
426 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
427 | &cur_rqst[0], rqst); | |
7fb8986e PS |
428 | if (rc) |
429 | return rc; | |
430 | ||
1f3a8f5f RS |
431 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
432 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 433 | return rc; |
6f49f46b JL |
434 | } |
435 | ||
0496e02d JL |
436 | int |
437 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
438 | unsigned int smb_buf_length) | |
439 | { | |
738f9de5 | 440 | struct kvec iov[2]; |
7fb8986e PS |
441 | struct smb_rqst rqst = { .rq_iov = iov, |
442 | .rq_nvec = 2 }; | |
0496e02d | 443 | |
738f9de5 PS |
444 | iov[0].iov_base = smb_buffer; |
445 | iov[0].iov_len = 4; | |
446 | iov[1].iov_base = (char *)smb_buffer + 4; | |
447 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 448 | |
07cd952f | 449 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
450 | } |
451 | ||
fc40f9cf | 452 | static int |
a891f0f8 | 453 | wait_for_free_credits(struct TCP_Server_Info *server, const int timeout, |
34f4deb7 | 454 | int *credits, unsigned int *instance) |
1da177e4 | 455 | { |
5bc59498 PS |
456 | int rc; |
457 | ||
34f4deb7 PS |
458 | *instance = 0; |
459 | ||
fc40f9cf | 460 | spin_lock(&server->req_lock); |
a891f0f8 | 461 | if (timeout == CIFS_ASYNC_OP) { |
1da177e4 | 462 | /* oplock breaks must not be held up */ |
fc40f9cf | 463 | server->in_flight++; |
bc205ed1 | 464 | *credits -= 1; |
34f4deb7 | 465 | *instance = server->reconnect_instance; |
fc40f9cf | 466 | spin_unlock(&server->req_lock); |
27a97a61 VL |
467 | return 0; |
468 | } | |
469 | ||
27a97a61 | 470 | while (1) { |
bc205ed1 | 471 | if (*credits <= 0) { |
fc40f9cf | 472 | spin_unlock(&server->req_lock); |
789e6661 | 473 | cifs_num_waiters_inc(server); |
5bc59498 | 474 | rc = wait_event_killable(server->request_q, |
bc205ed1 | 475 | has_credits(server, credits)); |
789e6661 | 476 | cifs_num_waiters_dec(server); |
5bc59498 PS |
477 | if (rc) |
478 | return rc; | |
fc40f9cf | 479 | spin_lock(&server->req_lock); |
27a97a61 | 480 | } else { |
c5797a94 | 481 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 482 | spin_unlock(&server->req_lock); |
27a97a61 | 483 | return -ENOENT; |
1da177e4 | 484 | } |
27a97a61 | 485 | |
2d86dbc9 PS |
486 | /* |
487 | * Can not count locking commands against total | |
488 | * as they are allowed to block on server. | |
489 | */ | |
27a97a61 VL |
490 | |
491 | /* update # of requests on the wire to server */ | |
a891f0f8 | 492 | if (timeout != CIFS_BLOCKING_OP) { |
bc205ed1 | 493 | *credits -= 1; |
fc40f9cf | 494 | server->in_flight++; |
34f4deb7 | 495 | *instance = server->reconnect_instance; |
2d86dbc9 | 496 | } |
fc40f9cf | 497 | spin_unlock(&server->req_lock); |
27a97a61 | 498 | break; |
1da177e4 LT |
499 | } |
500 | } | |
7ee1af76 JA |
501 | return 0; |
502 | } | |
1da177e4 | 503 | |
bc205ed1 | 504 | static int |
a891f0f8 | 505 | wait_for_free_request(struct TCP_Server_Info *server, const int timeout, |
34f4deb7 | 506 | const int optype, unsigned int *instance) |
bc205ed1 | 507 | { |
eb4c7df6 SP |
508 | int *val; |
509 | ||
510 | val = server->ops->get_credits_field(server, optype); | |
511 | /* Since an echo is already inflight, no need to wait to send another */ | |
512 | if (*val <= 0 && optype == CIFS_ECHO_OP) | |
513 | return -EAGAIN; | |
34f4deb7 | 514 | return wait_for_free_credits(server, timeout, val, instance); |
bc205ed1 PS |
515 | } |
516 | ||
cb7e9eab PS |
517 | int |
518 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
335b7b62 | 519 | unsigned int *num, struct cifs_credits *credits) |
cb7e9eab PS |
520 | { |
521 | *num = size; | |
335b7b62 PS |
522 | credits->value = 0; |
523 | credits->instance = server->reconnect_instance; | |
cb7e9eab PS |
524 | return 0; |
525 | } | |
526 | ||
96daf2b0 | 527 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
528 | struct mid_q_entry **ppmidQ) |
529 | { | |
1da177e4 | 530 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 531 | return -ENOENT; |
8fbbd365 VL |
532 | } |
533 | ||
534 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 535 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 536 | return -EAGAIN; |
8fbbd365 VL |
537 | } |
538 | ||
7f48558e | 539 | if (ses->status == CifsNew) { |
79a58d1f | 540 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 541 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 542 | return -EAGAIN; |
ad7a2926 | 543 | /* else ok - we are setting up session */ |
1da177e4 | 544 | } |
7f48558e SP |
545 | |
546 | if (ses->status == CifsExiting) { | |
547 | /* check if SMB session is bad because we are setting it up */ | |
548 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
549 | return -EAGAIN; | |
550 | /* else ok - we are shutting down session */ | |
551 | } | |
552 | ||
24b9b06b | 553 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 554 | if (*ppmidQ == NULL) |
7ee1af76 | 555 | return -ENOMEM; |
ddc8cf8f JL |
556 | spin_lock(&GlobalMid_Lock); |
557 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
558 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
559 | return 0; |
560 | } | |
561 | ||
0ade640e JL |
562 | static int |
563 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 564 | { |
0ade640e | 565 | int error; |
7ee1af76 | 566 | |
5853cc2a | 567 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 568 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
569 | if (error < 0) |
570 | return -ERESTARTSYS; | |
7ee1af76 | 571 | |
0ade640e | 572 | return 0; |
7ee1af76 JA |
573 | } |
574 | ||
fec344e3 JL |
575 | struct mid_q_entry * |
576 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
577 | { |
578 | int rc; | |
fec344e3 | 579 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
580 | struct mid_q_entry *mid; |
581 | ||
738f9de5 PS |
582 | if (rqst->rq_iov[0].iov_len != 4 || |
583 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
584 | return ERR_PTR(-EIO); | |
585 | ||
792af7b0 | 586 | /* enable signing if server requires it */ |
38d77c50 | 587 | if (server->sign) |
792af7b0 PS |
588 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
589 | ||
590 | mid = AllocMidQEntry(hdr, server); | |
591 | if (mid == NULL) | |
fec344e3 | 592 | return ERR_PTR(-ENOMEM); |
792af7b0 | 593 | |
fec344e3 | 594 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
595 | if (rc) { |
596 | DeleteMidQEntry(mid); | |
fec344e3 | 597 | return ERR_PTR(rc); |
ffc61ccb SP |
598 | } |
599 | ||
fec344e3 | 600 | return mid; |
792af7b0 | 601 | } |
133672ef | 602 | |
a6827c18 JL |
603 | /* |
604 | * Send a SMB request and set the callback function in the mid to handle | |
605 | * the result. Caller is responsible for dealing with timeouts. | |
606 | */ | |
607 | int | |
fec344e3 | 608 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 | 609 | mid_receive_t *receive, mid_callback_t *callback, |
3349c3a7 PS |
610 | mid_handle_t *handle, void *cbdata, const int flags, |
611 | const struct cifs_credits *exist_credits) | |
a6827c18 | 612 | { |
a891f0f8 | 613 | int rc, timeout, optype; |
a6827c18 | 614 | struct mid_q_entry *mid; |
335b7b62 | 615 | struct cifs_credits credits = { .value = 0, .instance = 0 }; |
34f4deb7 | 616 | unsigned int instance; |
a6827c18 | 617 | |
a891f0f8 PS |
618 | timeout = flags & CIFS_TIMEOUT_MASK; |
619 | optype = flags & CIFS_OP_MASK; | |
620 | ||
cb7e9eab | 621 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
34f4deb7 | 622 | rc = wait_for_free_request(server, timeout, optype, &instance); |
cb7e9eab PS |
623 | if (rc) |
624 | return rc; | |
335b7b62 | 625 | credits.value = 1; |
34f4deb7 | 626 | credits.instance = instance; |
3349c3a7 PS |
627 | } else |
628 | instance = exist_credits->instance; | |
a6827c18 JL |
629 | |
630 | mutex_lock(&server->srv_mutex); | |
3349c3a7 PS |
631 | |
632 | /* | |
633 | * We can't use credits obtained from the previous session to send this | |
634 | * request. Check if there were reconnects after we obtained credits and | |
635 | * return -EAGAIN in such cases to let callers handle it. | |
636 | */ | |
637 | if (instance != server->reconnect_instance) { | |
638 | mutex_unlock(&server->srv_mutex); | |
639 | add_credits_and_wake_if(server, &credits, optype); | |
640 | return -EAGAIN; | |
641 | } | |
642 | ||
fec344e3 JL |
643 | mid = server->ops->setup_async_request(server, rqst); |
644 | if (IS_ERR(mid)) { | |
a6827c18 | 645 | mutex_unlock(&server->srv_mutex); |
335b7b62 | 646 | add_credits_and_wake_if(server, &credits, optype); |
fec344e3 | 647 | return PTR_ERR(mid); |
a6827c18 JL |
648 | } |
649 | ||
44d22d84 | 650 | mid->receive = receive; |
a6827c18 JL |
651 | mid->callback = callback; |
652 | mid->callback_data = cbdata; | |
9b7c18a2 | 653 | mid->handle = handle; |
7c9421e1 | 654 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 655 | |
ffc61ccb SP |
656 | /* put it on the pending_mid_q */ |
657 | spin_lock(&GlobalMid_Lock); | |
658 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
659 | spin_unlock(&GlobalMid_Lock); | |
660 | ||
93d2cb6c LL |
661 | /* |
662 | * Need to store the time in mid before calling I/O. For call_async, | |
663 | * I/O response may come back and free the mid entry on another thread. | |
664 | */ | |
665 | cifs_save_when_sent(mid); | |
789e6661 | 666 | cifs_in_send_inc(server); |
1f3a8f5f | 667 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 668 | cifs_in_send_dec(server); |
ad313cb8 | 669 | |
820962dc | 670 | if (rc < 0) { |
c781af7e | 671 | revert_current_mid(server, mid->credits); |
ad313cb8 | 672 | server->sequence_number -= 2; |
820962dc RV |
673 | cifs_delete_mid(mid); |
674 | } | |
675 | ||
a6827c18 | 676 | mutex_unlock(&server->srv_mutex); |
789e6661 | 677 | |
ffc61ccb SP |
678 | if (rc == 0) |
679 | return 0; | |
a6827c18 | 680 | |
335b7b62 | 681 | add_credits_and_wake_if(server, &credits, optype); |
a6827c18 JL |
682 | return rc; |
683 | } | |
684 | ||
133672ef SF |
685 | /* |
686 | * | |
687 | * Send an SMB Request. No response info (other than return code) | |
688 | * needs to be parsed. | |
689 | * | |
690 | * flags indicate the type of request buffer and how long to wait | |
691 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
692 | * | |
693 | */ | |
694 | int | |
96daf2b0 | 695 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 696 | char *in_buf, int flags) |
133672ef SF |
697 | { |
698 | int rc; | |
699 | struct kvec iov[1]; | |
da502f7d | 700 | struct kvec rsp_iov; |
133672ef SF |
701 | int resp_buf_type; |
702 | ||
792af7b0 PS |
703 | iov[0].iov_base = in_buf; |
704 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 705 | flags |= CIFS_NO_RESP; |
da502f7d | 706 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 707 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 708 | |
133672ef SF |
709 | return rc; |
710 | } | |
711 | ||
053d5034 | 712 | static int |
3c1105df | 713 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
714 | { |
715 | int rc = 0; | |
716 | ||
f96637be JP |
717 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
718 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 719 | |
74dd92a8 | 720 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 721 | switch (mid->mid_state) { |
74dd92a8 | 722 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
723 | spin_unlock(&GlobalMid_Lock); |
724 | return rc; | |
74dd92a8 JL |
725 | case MID_RETRY_NEEDED: |
726 | rc = -EAGAIN; | |
727 | break; | |
71823baf JL |
728 | case MID_RESPONSE_MALFORMED: |
729 | rc = -EIO; | |
730 | break; | |
3c1105df JL |
731 | case MID_SHUTDOWN: |
732 | rc = -EHOSTDOWN; | |
733 | break; | |
74dd92a8 | 734 | default: |
3c1105df | 735 | list_del_init(&mid->qhead); |
f96637be JP |
736 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
737 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 738 | rc = -EIO; |
053d5034 JL |
739 | } |
740 | spin_unlock(&GlobalMid_Lock); | |
741 | ||
2b84a36c | 742 | DeleteMidQEntry(mid); |
053d5034 JL |
743 | return rc; |
744 | } | |
745 | ||
121b046a | 746 | static inline int |
fb2036d8 PS |
747 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
748 | struct mid_q_entry *mid) | |
76dcc26f | 749 | { |
121b046a | 750 | return server->ops->send_cancel ? |
fb2036d8 | 751 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
752 | } |
753 | ||
2c8f981d JL |
754 | int |
755 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
756 | bool log_error) | |
757 | { | |
792af7b0 | 758 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
759 | |
760 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
761 | |
762 | /* convert the length into a more usable form */ | |
38d77c50 | 763 | if (server->sign) { |
738f9de5 | 764 | struct kvec iov[2]; |
985e4ff0 | 765 | int rc = 0; |
738f9de5 PS |
766 | struct smb_rqst rqst = { .rq_iov = iov, |
767 | .rq_nvec = 2 }; | |
826a95e4 | 768 | |
738f9de5 PS |
769 | iov[0].iov_base = mid->resp_buf; |
770 | iov[0].iov_len = 4; | |
771 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
772 | iov[1].iov_len = len - 4; | |
2c8f981d | 773 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 774 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 775 | mid->sequence_number); |
985e4ff0 | 776 | if (rc) |
f96637be JP |
777 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
778 | rc); | |
2c8f981d JL |
779 | } |
780 | ||
781 | /* BB special case reconnect tid and uid here? */ | |
782 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
783 | } | |
784 | ||
fec344e3 JL |
785 | struct mid_q_entry * |
786 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
787 | { |
788 | int rc; | |
fec344e3 | 789 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
790 | struct mid_q_entry *mid; |
791 | ||
738f9de5 PS |
792 | if (rqst->rq_iov[0].iov_len != 4 || |
793 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
794 | return ERR_PTR(-EIO); | |
795 | ||
792af7b0 PS |
796 | rc = allocate_mid(ses, hdr, &mid); |
797 | if (rc) | |
fec344e3 JL |
798 | return ERR_PTR(rc); |
799 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
800 | if (rc) { | |
3c1bf7e4 | 801 | cifs_delete_mid(mid); |
fec344e3 JL |
802 | return ERR_PTR(rc); |
803 | } | |
804 | return mid; | |
792af7b0 PS |
805 | } |
806 | ||
4e34feb5 | 807 | static void |
ee258d79 | 808 | cifs_compound_callback(struct mid_q_entry *mid) |
8a26f0f7 PS |
809 | { |
810 | struct TCP_Server_Info *server = mid->server; | |
34f4deb7 PS |
811 | struct cifs_credits credits; |
812 | ||
813 | credits.value = server->ops->get_credits(mid); | |
814 | credits.instance = server->reconnect_instance; | |
8a26f0f7 | 815 | |
34f4deb7 | 816 | add_credits(server, &credits, mid->optype); |
8a26f0f7 PS |
817 | } |
818 | ||
ee258d79 PS |
819 | static void |
820 | cifs_compound_last_callback(struct mid_q_entry *mid) | |
821 | { | |
822 | cifs_compound_callback(mid); | |
823 | cifs_wake_up_task(mid); | |
824 | } | |
825 | ||
826 | static void | |
827 | cifs_cancelled_callback(struct mid_q_entry *mid) | |
828 | { | |
829 | cifs_compound_callback(mid); | |
830 | DeleteMidQEntry(mid); | |
831 | } | |
832 | ||
b8f57ee8 | 833 | int |
e0bba0b8 RS |
834 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
835 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
836 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 837 | { |
e0bba0b8 | 838 | int i, j, rc = 0; |
a891f0f8 | 839 | int timeout, optype; |
e0bba0b8 | 840 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
8544f4aa | 841 | bool cancelled_mid[MAX_COMPOUND] = {false}; |
34f4deb7 PS |
842 | struct cifs_credits credits[MAX_COMPOUND] = { |
843 | { .value = 0, .instance = 0 } | |
844 | }; | |
845 | unsigned int instance; | |
97ea4998 | 846 | unsigned int first_instance = 0; |
738f9de5 | 847 | char *buf; |
50c2f753 | 848 | |
a891f0f8 PS |
849 | timeout = flags & CIFS_TIMEOUT_MASK; |
850 | optype = flags & CIFS_OP_MASK; | |
133672ef | 851 | |
e0bba0b8 RS |
852 | for (i = 0; i < num_rqst; i++) |
853 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
854 | |
855 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 856 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
857 | return -EIO; |
858 | } | |
859 | ||
da502f7d | 860 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 861 | return -ENOENT; |
7ee1af76 | 862 | |
7091bcab PS |
863 | spin_lock(&ses->server->req_lock); |
864 | if (ses->server->credits < num_rqst) { | |
865 | /* | |
866 | * Return immediately if not too many requests in flight since | |
867 | * we will likely be stuck on waiting for credits. | |
868 | */ | |
869 | if (ses->server->in_flight < num_rqst - ses->server->credits) { | |
870 | spin_unlock(&ses->server->req_lock); | |
871 | return -ENOTSUPP; | |
872 | } | |
873 | } else { | |
874 | /* enough credits to send the whole compounded request */ | |
875 | ses->server->credits -= num_rqst; | |
876 | ses->server->in_flight += num_rqst; | |
877 | first_instance = ses->server->reconnect_instance; | |
878 | } | |
879 | spin_unlock(&ses->server->req_lock); | |
880 | ||
881 | if (first_instance) { | |
882 | cifs_dbg(FYI, "Acquired %d credits at once\n", num_rqst); | |
883 | for (i = 0; i < num_rqst; i++) { | |
884 | credits[i].value = 1; | |
885 | credits[i].instance = first_instance; | |
886 | } | |
887 | goto setup_rqsts; | |
888 | } | |
889 | ||
792af7b0 | 890 | /* |
7091bcab PS |
891 | * There are not enough credits to send the whole compound request but |
892 | * there are requests in flight that may bring credits from the server. | |
893 | * This approach still leaves the possibility to be stuck waiting for | |
894 | * credits if the server doesn't grant credits to the outstanding | |
895 | * requests. This should be fixed by returning immediately and letting | |
896 | * a caller fallback to sequential commands instead of compounding. | |
8544f4aa | 897 | * Ensure we obtain 1 credit per request in the compound chain. |
792af7b0 | 898 | */ |
8544f4aa | 899 | for (i = 0; i < num_rqst; i++) { |
34f4deb7 PS |
900 | rc = wait_for_free_request(ses->server, timeout, optype, |
901 | &instance); | |
97ea4998 PS |
902 | |
903 | if (rc == 0) { | |
904 | credits[i].value = 1; | |
905 | credits[i].instance = instance; | |
906 | /* | |
907 | * All parts of the compound chain must get credits from | |
908 | * the same session, otherwise we may end up using more | |
909 | * credits than the server granted. If there were | |
910 | * reconnects in between, return -EAGAIN and let callers | |
911 | * handle it. | |
912 | */ | |
913 | if (i == 0) | |
914 | first_instance = instance; | |
915 | else if (first_instance != instance) { | |
916 | i++; | |
917 | rc = -EAGAIN; | |
918 | } | |
919 | } | |
920 | ||
8544f4aa PS |
921 | if (rc) { |
922 | /* | |
923 | * We haven't sent an SMB packet to the server yet but | |
924 | * we already obtained credits for i requests in the | |
925 | * compound chain - need to return those credits back | |
926 | * for future use. Note that we need to call add_credits | |
927 | * multiple times to match the way we obtained credits | |
928 | * in the first place and to account for in flight | |
929 | * requests correctly. | |
930 | */ | |
931 | for (j = 0; j < i; j++) | |
34f4deb7 | 932 | add_credits(ses->server, &credits[j], optype); |
8544f4aa PS |
933 | return rc; |
934 | } | |
8544f4aa | 935 | } |
7ee1af76 | 936 | |
7091bcab | 937 | setup_rqsts: |
792af7b0 PS |
938 | /* |
939 | * Make sure that we sign in the same order that we send on this socket | |
940 | * and avoid races inside tcp sendmsg code that could cause corruption | |
941 | * of smb data. | |
942 | */ | |
7ee1af76 | 943 | |
72ca545b | 944 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 945 | |
97ea4998 PS |
946 | /* |
947 | * All the parts of the compound chain belong obtained credits from the | |
948 | * same session (see the appropriate checks above). In the same time | |
949 | * there might be reconnects after those checks but before we acquired | |
950 | * the srv_mutex. We can not use credits obtained from the previous | |
951 | * session to send this request. Check if there were reconnects after | |
952 | * we obtained credits and return -EAGAIN in such cases to let callers | |
953 | * handle it. | |
954 | */ | |
955 | if (first_instance != ses->server->reconnect_instance) { | |
956 | mutex_unlock(&ses->server->srv_mutex); | |
957 | for (j = 0; j < num_rqst; j++) | |
958 | add_credits(ses->server, &credits[j], optype); | |
959 | return -EAGAIN; | |
960 | } | |
961 | ||
e0bba0b8 RS |
962 | for (i = 0; i < num_rqst; i++) { |
963 | midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); | |
964 | if (IS_ERR(midQ[i])) { | |
c781af7e | 965 | revert_current_mid(ses->server, i); |
e0bba0b8 RS |
966 | for (j = 0; j < i; j++) |
967 | cifs_delete_mid(midQ[j]); | |
968 | mutex_unlock(&ses->server->srv_mutex); | |
8544f4aa | 969 | |
e0bba0b8 | 970 | /* Update # of requests on wire to server */ |
8544f4aa | 971 | for (j = 0; j < num_rqst; j++) |
34f4deb7 | 972 | add_credits(ses->server, &credits[j], optype); |
e0bba0b8 RS |
973 | return PTR_ERR(midQ[i]); |
974 | } | |
975 | ||
976 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
8a26f0f7 | 977 | midQ[i]->optype = optype; |
4e34feb5 | 978 | /* |
ee258d79 PS |
979 | * Invoke callback for every part of the compound chain |
980 | * to calculate credits properly. Wake up this thread only when | |
981 | * the last element is received. | |
4e34feb5 RS |
982 | */ |
983 | if (i < num_rqst - 1) | |
ee258d79 PS |
984 | midQ[i]->callback = cifs_compound_callback; |
985 | else | |
986 | midQ[i]->callback = cifs_compound_last_callback; | |
1da177e4 | 987 | } |
789e6661 | 988 | cifs_in_send_inc(ses->server); |
e0bba0b8 | 989 | rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); |
789e6661 | 990 | cifs_in_send_dec(ses->server); |
e0bba0b8 RS |
991 | |
992 | for (i = 0; i < num_rqst; i++) | |
993 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 994 | |
c781af7e PS |
995 | if (rc < 0) { |
996 | revert_current_mid(ses->server, num_rqst); | |
ad313cb8 | 997 | ses->server->sequence_number -= 2; |
c781af7e | 998 | } |
e0bba0b8 | 999 | |
72ca545b | 1000 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1001 | |
ee258d79 PS |
1002 | if (rc < 0) { |
1003 | /* Sending failed for some reason - return credits back */ | |
1004 | for (i = 0; i < num_rqst; i++) | |
34f4deb7 | 1005 | add_credits(ses->server, &credits[i], optype); |
cb5c2e63 | 1006 | goto out; |
ee258d79 PS |
1007 | } |
1008 | ||
1009 | /* | |
1010 | * At this point the request is passed to the network stack - we assume | |
1011 | * that any credits taken from the server structure on the client have | |
1012 | * been spent and we can't return them back. Once we receive responses | |
1013 | * we will collect credits granted by the server in the mid callbacks | |
1014 | * and add those credits to the server structure. | |
1015 | */ | |
e0bba0b8 | 1016 | |
cb5c2e63 RS |
1017 | /* |
1018 | * Compounding is never used during session establish. | |
1019 | */ | |
1020 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
1021 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, | |
1022 | rqst[0].rq_nvec); | |
e0bba0b8 | 1023 | |
cb5c2e63 RS |
1024 | if (timeout == CIFS_ASYNC_OP) |
1025 | goto out; | |
e0bba0b8 | 1026 | |
cb5c2e63 | 1027 | for (i = 0; i < num_rqst; i++) { |
e0bba0b8 | 1028 | rc = wait_for_response(ses->server, midQ[i]); |
8a26f0f7 PS |
1029 | if (rc != 0) |
1030 | break; | |
1031 | } | |
1032 | if (rc != 0) { | |
1033 | for (; i < num_rqst; i++) { | |
43de1db3 SF |
1034 | cifs_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", |
1035 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); | |
e0bba0b8 RS |
1036 | send_cancel(ses->server, &rqst[i], midQ[i]); |
1037 | spin_lock(&GlobalMid_Lock); | |
1038 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
1039 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
8a26f0f7 | 1040 | midQ[i]->callback = cifs_cancelled_callback; |
8544f4aa | 1041 | cancelled_mid[i] = true; |
34f4deb7 | 1042 | credits[i].value = 0; |
e0bba0b8 | 1043 | } |
1be912dd | 1044 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 1045 | } |
cb5c2e63 RS |
1046 | } |
1047 | ||
cb5c2e63 RS |
1048 | for (i = 0; i < num_rqst; i++) { |
1049 | if (rc < 0) | |
1050 | goto out; | |
e0bba0b8 RS |
1051 | |
1052 | rc = cifs_sync_mid_result(midQ[i], ses->server); | |
1053 | if (rc != 0) { | |
8544f4aa PS |
1054 | /* mark this mid as cancelled to not free it below */ |
1055 | cancelled_mid[i] = true; | |
1056 | goto out; | |
1be912dd | 1057 | } |
2b2bdfba | 1058 | |
e0bba0b8 RS |
1059 | if (!midQ[i]->resp_buf || |
1060 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
1061 | rc = -EIO; | |
1062 | cifs_dbg(FYI, "Bad MID state?\n"); | |
1063 | goto out; | |
1064 | } | |
a891f0f8 | 1065 | |
e0bba0b8 RS |
1066 | buf = (char *)midQ[i]->resp_buf; |
1067 | resp_iov[i].iov_base = buf; | |
1068 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
1069 | ses->server->vals->header_preamble_size; | |
1070 | ||
1071 | if (midQ[i]->large_buf) | |
1072 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
1073 | else | |
1074 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
1075 | ||
e0bba0b8 RS |
1076 | rc = ses->server->ops->check_receive(midQ[i], ses->server, |
1077 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 1078 | |
e0bba0b8 RS |
1079 | /* mark it so buf will not be freed by cifs_delete_mid */ |
1080 | if ((flags & CIFS_NO_RESP) == 0) | |
1081 | midQ[i]->resp_buf = NULL; | |
cb5c2e63 | 1082 | |
e0bba0b8 | 1083 | } |
cb5c2e63 RS |
1084 | |
1085 | /* | |
1086 | * Compounding is never used during session establish. | |
1087 | */ | |
1088 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
1089 | struct kvec iov = { | |
1090 | .iov_base = resp_iov[0].iov_base, | |
1091 | .iov_len = resp_iov[0].iov_len | |
1092 | }; | |
1093 | smb311_update_preauth_hash(ses, &iov, 1); | |
1094 | } | |
1095 | ||
7ee1af76 | 1096 | out: |
4e34feb5 RS |
1097 | /* |
1098 | * This will dequeue all mids. After this it is important that the | |
1099 | * demultiplex_thread will not process any of these mids any futher. | |
1100 | * This is prevented above by using a noop callback that will not | |
1101 | * wake this thread except for the very last PDU. | |
1102 | */ | |
8544f4aa PS |
1103 | for (i = 0; i < num_rqst; i++) { |
1104 | if (!cancelled_mid[i]) | |
1105 | cifs_delete_mid(midQ[i]); | |
8544f4aa | 1106 | } |
1da177e4 | 1107 | |
d6e04ae6 SF |
1108 | return rc; |
1109 | } | |
1da177e4 | 1110 | |
e0bba0b8 RS |
1111 | int |
1112 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
1113 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
1114 | struct kvec *resp_iov) | |
1115 | { | |
1116 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
1117 | resp_iov); | |
1118 | } | |
1119 | ||
738f9de5 PS |
1120 | int |
1121 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
1122 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
1123 | const int flags, struct kvec *resp_iov) | |
1124 | { | |
1125 | struct smb_rqst rqst; | |
3cecf486 | 1126 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
1127 | int rc; |
1128 | ||
3cecf486 | 1129 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
1130 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
1131 | GFP_KERNEL); | |
117e3b7f SF |
1132 | if (!new_iov) { |
1133 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
1134 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 1135 | return -ENOMEM; |
117e3b7f | 1136 | } |
3cecf486 RS |
1137 | } else |
1138 | new_iov = s_iov; | |
738f9de5 PS |
1139 | |
1140 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
1141 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
1142 | ||
1143 | new_iov[0].iov_base = new_iov[1].iov_base; | |
1144 | new_iov[0].iov_len = 4; | |
1145 | new_iov[1].iov_base += 4; | |
1146 | new_iov[1].iov_len -= 4; | |
1147 | ||
1148 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
1149 | rqst.rq_iov = new_iov; | |
1150 | rqst.rq_nvec = n_vec + 1; | |
1151 | ||
1152 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1153 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1154 | kfree(new_iov); | |
738f9de5 PS |
1155 | return rc; |
1156 | } | |
1157 | ||
1da177e4 | 1158 | int |
96daf2b0 | 1159 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1160 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
a891f0f8 | 1161 | int *pbytes_returned, const int timeout) |
1da177e4 LT |
1162 | { |
1163 | int rc = 0; | |
1da177e4 | 1164 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1165 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1166 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1167 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1168 | struct cifs_credits credits = { .value = 1, .instance = 0 }; |
1da177e4 LT |
1169 | |
1170 | if (ses == NULL) { | |
f96637be | 1171 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1172 | return -EIO; |
1173 | } | |
79a58d1f | 1174 | if (ses->server == NULL) { |
f96637be | 1175 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1176 | return -EIO; |
1177 | } | |
1178 | ||
79a58d1f | 1179 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1180 | return -ENOENT; |
1181 | ||
79a58d1f | 1182 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1183 | to the same server. We may make this configurable later or |
1184 | use ses->maxReq */ | |
1da177e4 | 1185 | |
fb2036d8 | 1186 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1187 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1188 | len); |
6d9c6d54 VL |
1189 | return -EIO; |
1190 | } | |
1191 | ||
34f4deb7 | 1192 | rc = wait_for_free_request(ses->server, timeout, 0, &credits.instance); |
7ee1af76 JA |
1193 | if (rc) |
1194 | return rc; | |
1195 | ||
79a58d1f | 1196 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1197 | and avoid races inside tcp sendmsg code that could cause corruption |
1198 | of smb data */ | |
1199 | ||
72ca545b | 1200 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 1201 | |
7ee1af76 JA |
1202 | rc = allocate_mid(ses, in_buf, &midQ); |
1203 | if (rc) { | |
72ca545b | 1204 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1205 | /* Update # of requests on wire to server */ |
34f4deb7 | 1206 | add_credits(ses->server, &credits, 0); |
7ee1af76 | 1207 | return rc; |
1da177e4 LT |
1208 | } |
1209 | ||
ad009ac9 | 1210 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
1211 | if (rc) { |
1212 | mutex_unlock(&ses->server->srv_mutex); | |
1213 | goto out; | |
1214 | } | |
1da177e4 | 1215 | |
7c9421e1 | 1216 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
1217 | |
1218 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 1219 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1220 | cifs_in_send_dec(ses->server); |
1221 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1222 | |
1223 | if (rc < 0) | |
1224 | ses->server->sequence_number -= 2; | |
1225 | ||
72ca545b | 1226 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1227 | |
79a58d1f | 1228 | if (rc < 0) |
7ee1af76 JA |
1229 | goto out; |
1230 | ||
a891f0f8 | 1231 | if (timeout == CIFS_ASYNC_OP) |
7ee1af76 | 1232 | goto out; |
1da177e4 | 1233 | |
0ade640e | 1234 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1235 | if (rc != 0) { |
fb2036d8 | 1236 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1237 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1238 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1239 | /* no longer considered to be "in-flight" */ |
1240 | midQ->callback = DeleteMidQEntry; | |
1241 | spin_unlock(&GlobalMid_Lock); | |
34f4deb7 | 1242 | add_credits(ses->server, &credits, 0); |
1be912dd JL |
1243 | return rc; |
1244 | } | |
1245 | spin_unlock(&GlobalMid_Lock); | |
1246 | } | |
1da177e4 | 1247 | |
3c1105df | 1248 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1249 | if (rc != 0) { |
34f4deb7 | 1250 | add_credits(ses->server, &credits, 0); |
1da177e4 LT |
1251 | return rc; |
1252 | } | |
50c2f753 | 1253 | |
2c8f981d | 1254 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1255 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1256 | rc = -EIO; |
f96637be | 1257 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1258 | goto out; |
1da177e4 | 1259 | } |
7ee1af76 | 1260 | |
d4e4854f | 1261 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1262 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1263 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1264 | out: |
3c1bf7e4 | 1265 | cifs_delete_mid(midQ); |
34f4deb7 | 1266 | add_credits(ses->server, &credits, 0); |
1da177e4 | 1267 | |
7ee1af76 JA |
1268 | return rc; |
1269 | } | |
1da177e4 | 1270 | |
7ee1af76 JA |
1271 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1272 | blocking lock to return. */ | |
1273 | ||
1274 | static int | |
96daf2b0 | 1275 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1276 | struct smb_hdr *in_buf, |
1277 | struct smb_hdr *out_buf) | |
1278 | { | |
1279 | int bytes_returned; | |
96daf2b0 | 1280 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1281 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1282 | ||
1283 | /* We just modify the current in_buf to change | |
1284 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1285 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1286 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1287 | ||
1288 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1289 | pSMB->Timeout = 0; | |
88257360 | 1290 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1291 | |
1292 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1293 | &bytes_returned, 0); |
7ee1af76 JA |
1294 | } |
1295 | ||
1296 | int | |
96daf2b0 | 1297 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1298 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1299 | int *pbytes_returned) | |
1300 | { | |
1301 | int rc = 0; | |
1302 | int rstart = 0; | |
7ee1af76 | 1303 | struct mid_q_entry *midQ; |
96daf2b0 | 1304 | struct cifs_ses *ses; |
fb2036d8 PS |
1305 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1306 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1307 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1308 | unsigned int instance; |
7ee1af76 JA |
1309 | |
1310 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1311 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1312 | return -EIO; |
1313 | } | |
1314 | ses = tcon->ses; | |
1315 | ||
79a58d1f | 1316 | if (ses->server == NULL) { |
f96637be | 1317 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1318 | return -EIO; |
1319 | } | |
1320 | ||
79a58d1f | 1321 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1322 | return -ENOENT; |
1323 | ||
79a58d1f | 1324 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1325 | to the same server. We may make this configurable later or |
1326 | use ses->maxReq */ | |
1327 | ||
fb2036d8 | 1328 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1329 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1330 | len); |
6d9c6d54 VL |
1331 | return -EIO; |
1332 | } | |
1333 | ||
34f4deb7 PS |
1334 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, 0, |
1335 | &instance); | |
7ee1af76 JA |
1336 | if (rc) |
1337 | return rc; | |
1338 | ||
79a58d1f | 1339 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1340 | and avoid races inside tcp sendmsg code that could cause corruption |
1341 | of smb data */ | |
1342 | ||
72ca545b | 1343 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1344 | |
1345 | rc = allocate_mid(ses, in_buf, &midQ); | |
1346 | if (rc) { | |
72ca545b | 1347 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1348 | return rc; |
1349 | } | |
1350 | ||
7ee1af76 | 1351 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1352 | if (rc) { |
3c1bf7e4 | 1353 | cifs_delete_mid(midQ); |
829049cb VL |
1354 | mutex_unlock(&ses->server->srv_mutex); |
1355 | return rc; | |
1356 | } | |
1da177e4 | 1357 | |
7c9421e1 | 1358 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1359 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1360 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1361 | cifs_in_send_dec(ses->server); |
1362 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1363 | |
1364 | if (rc < 0) | |
1365 | ses->server->sequence_number -= 2; | |
1366 | ||
72ca545b | 1367 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1368 | |
79a58d1f | 1369 | if (rc < 0) { |
3c1bf7e4 | 1370 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1371 | return rc; |
1372 | } | |
1373 | ||
1374 | /* Wait for a reply - allow signals to interrupt. */ | |
1375 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1376 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1377 | ((ses->server->tcpStatus != CifsGood) && |
1378 | (ses->server->tcpStatus != CifsNew))); | |
1379 | ||
1380 | /* Were we interrupted by a signal ? */ | |
1381 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1382 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1383 | ((ses->server->tcpStatus == CifsGood) || |
1384 | (ses->server->tcpStatus == CifsNew))) { | |
1385 | ||
1386 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1387 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1388 | blocking lock to return. */ | |
fb2036d8 | 1389 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1390 | if (rc) { |
3c1bf7e4 | 1391 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1392 | return rc; |
1393 | } | |
1394 | } else { | |
1395 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1396 | to cause the blocking lock to return. */ | |
1397 | ||
1398 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1399 | ||
1400 | /* If we get -ENOLCK back the lock may have | |
1401 | already been removed. Don't exit in this case. */ | |
1402 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1403 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1404 | return rc; |
1405 | } | |
1406 | } | |
1407 | ||
1be912dd JL |
1408 | rc = wait_for_response(ses->server, midQ); |
1409 | if (rc) { | |
fb2036d8 | 1410 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1411 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1412 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1413 | /* no longer considered to be "in-flight" */ |
1414 | midQ->callback = DeleteMidQEntry; | |
1415 | spin_unlock(&GlobalMid_Lock); | |
1416 | return rc; | |
1417 | } | |
1418 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1419 | } |
1be912dd JL |
1420 | |
1421 | /* We got the response - restart system call. */ | |
1422 | rstart = 1; | |
7ee1af76 JA |
1423 | } |
1424 | ||
3c1105df | 1425 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1426 | if (rc != 0) |
7ee1af76 | 1427 | return rc; |
50c2f753 | 1428 | |
17c8bfed | 1429 | /* rcvd frame is ok */ |
7c9421e1 | 1430 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1431 | rc = -EIO; |
f96637be | 1432 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1433 | goto out; |
1434 | } | |
1da177e4 | 1435 | |
d4e4854f | 1436 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1437 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1438 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1439 | out: |
3c1bf7e4 | 1440 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1441 | if (rstart && rc == -EACCES) |
1442 | return -ERESTARTSYS; | |
1da177e4 LT |
1443 | return rc; |
1444 | } |