Commit | Line | Data |
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929be906 | 1 | // SPDX-License-Identifier: LGPL-2.1 |
1da177e4 | 2 | /* |
1da177e4 | 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 | */ |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/list.h> | |
5a0e3ad6 | 12 | #include <linux/gfp.h> |
1da177e4 LT |
13 | #include <linux/wait.h> |
14 | #include <linux/net.h> | |
15 | #include <linux/delay.h> | |
f06ac72e | 16 | #include <linux/freezer.h> |
b8eed283 | 17 | #include <linux/tcp.h> |
2f8b5444 | 18 | #include <linux/bvec.h> |
97bc00b3 | 19 | #include <linux/highmem.h> |
7c0f6ba6 | 20 | #include <linux/uaccess.h> |
1da177e4 LT |
21 | #include <asm/processor.h> |
22 | #include <linux/mempool.h> | |
14e25977 | 23 | #include <linux/sched/signal.h> |
fb157ed2 | 24 | #include <linux/task_io_accounting_ops.h> |
1da177e4 LT |
25 | #include "cifspdu.h" |
26 | #include "cifsglob.h" | |
27 | #include "cifsproto.h" | |
28 | #include "cifs_debug.h" | |
8bd68c6e | 29 | #include "smb2proto.h" |
9762c2d0 | 30 | #include "smbdirect.h" |
50c2f753 | 31 | |
3cecf486 RS |
32 | /* Max number of iovectors we can use off the stack when sending requests. */ |
33 | #define CIFS_MAX_IOV_SIZE 8 | |
34 | ||
2dc7e1c0 PS |
35 | void |
36 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
37 | { |
38 | wake_up_process(mid->callback_data); | |
39 | } | |
40 | ||
ea75a78c | 41 | static struct mid_q_entry * |
70f08f91 | 42 | alloc_mid(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
43 | { |
44 | struct mid_q_entry *temp; | |
45 | ||
24b9b06b | 46 | if (server == NULL) { |
70f08f91 | 47 | cifs_dbg(VFS, "%s: null TCP session\n", __func__); |
1da177e4 LT |
48 | return NULL; |
49 | } | |
50c2f753 | 50 | |
232087cb | 51 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
a6f74e80 | 52 | memset(temp, 0, sizeof(struct mid_q_entry)); |
696e420b | 53 | kref_init(&temp->refcount); |
a6f74e80 N |
54 | temp->mid = get_mid(smb_buffer); |
55 | temp->pid = current->pid; | |
56 | temp->command = cpu_to_le16(smb_buffer->Command); | |
57 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 58 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
59 | /* when mid allocated can be before when sent */ |
60 | temp->when_alloc = jiffies; | |
61 | temp->server = server; | |
2b84a36c | 62 | |
a6f74e80 N |
63 | /* |
64 | * The default is for the mid to be synchronous, so the | |
65 | * default callback just wakes up the current task. | |
66 | */ | |
f1f27ad7 VW |
67 | get_task_struct(current); |
68 | temp->creator = current; | |
a6f74e80 N |
69 | temp->callback = cifs_wake_up_task; |
70 | temp->callback_data = current; | |
1da177e4 | 71 | |
c2c17ddb | 72 | atomic_inc(&mid_count); |
7c9421e1 | 73 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
74 | return temp; |
75 | } | |
76 | ||
70f08f91 | 77 | static void __release_mid(struct kref *refcount) |
696e420b | 78 | { |
abe57073 PS |
79 | struct mid_q_entry *midEntry = |
80 | container_of(refcount, struct mid_q_entry, refcount); | |
1047abc1 | 81 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 82 | __le16 command = midEntry->server->vals->lock_cmd; |
433b8dd7 | 83 | __u16 smb_cmd = le16_to_cpu(midEntry->command); |
1047abc1 | 84 | unsigned long now; |
433b8dd7 | 85 | unsigned long roundtrip_time; |
1047abc1 | 86 | #endif |
7b71843f PS |
87 | struct TCP_Server_Info *server = midEntry->server; |
88 | ||
89 | if (midEntry->resp_buf && (midEntry->mid_flags & MID_WAIT_CANCELLED) && | |
90 | midEntry->mid_state == MID_RESPONSE_RECEIVED && | |
91 | server->ops->handle_cancelled_mid) | |
04ad69c3 | 92 | server->ops->handle_cancelled_mid(midEntry, server); |
7b71843f | 93 | |
7c9421e1 | 94 | midEntry->mid_state = MID_FREE; |
c2c17ddb | 95 | atomic_dec(&mid_count); |
7c9421e1 | 96 | if (midEntry->large_buf) |
b8643e1b SF |
97 | cifs_buf_release(midEntry->resp_buf); |
98 | else | |
99 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
100 | #ifdef CONFIG_CIFS_STATS2 |
101 | now = jiffies; | |
433b8dd7 | 102 | if (now < midEntry->when_alloc) |
a0a3036b | 103 | cifs_server_dbg(VFS, "Invalid mid allocation time\n"); |
433b8dd7 SF |
104 | roundtrip_time = now - midEntry->when_alloc; |
105 | ||
106 | if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) { | |
107 | if (atomic_read(&server->num_cmds[smb_cmd]) == 0) { | |
108 | server->slowest_cmd[smb_cmd] = roundtrip_time; | |
109 | server->fastest_cmd[smb_cmd] = roundtrip_time; | |
110 | } else { | |
111 | if (server->slowest_cmd[smb_cmd] < roundtrip_time) | |
112 | server->slowest_cmd[smb_cmd] = roundtrip_time; | |
113 | else if (server->fastest_cmd[smb_cmd] > roundtrip_time) | |
114 | server->fastest_cmd[smb_cmd] = roundtrip_time; | |
115 | } | |
116 | cifs_stats_inc(&server->num_cmds[smb_cmd]); | |
117 | server->time_per_cmd[smb_cmd] += roundtrip_time; | |
118 | } | |
00778e22 SF |
119 | /* |
120 | * commands taking longer than one second (default) can be indications | |
121 | * that something is wrong, unless it is quite a slow link or a very | |
122 | * busy server. Note that this calc is unlikely or impossible to wrap | |
123 | * as long as slow_rsp_threshold is not set way above recommended max | |
124 | * value (32767 ie 9 hours) and is generally harmless even if wrong | |
125 | * since only affects debug counters - so leaving the calc as simple | |
126 | * comparison rather than doing multiple conversions and overflow | |
127 | * checks | |
128 | */ | |
129 | if ((slow_rsp_threshold != 0) && | |
130 | time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && | |
020eec5f | 131 | (midEntry->command != command)) { |
f5942db5 SF |
132 | /* |
133 | * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command | |
134 | * NB: le16_to_cpu returns unsigned so can not be negative below | |
135 | */ | |
433b8dd7 SF |
136 | if (smb_cmd < NUMBER_OF_SMB2_COMMANDS) |
137 | cifs_stats_inc(&server->smb2slowcmd[smb_cmd]); | |
468d6779 | 138 | |
433b8dd7 | 139 | trace_smb3_slow_rsp(smb_cmd, midEntry->mid, midEntry->pid, |
020eec5f SF |
140 | midEntry->when_sent, midEntry->when_received); |
141 | if (cifsFYI & CIFS_TIMER) { | |
a0a3036b JP |
142 | pr_debug("slow rsp: cmd %d mid %llu", |
143 | midEntry->command, midEntry->mid); | |
144 | cifs_info("A: 0x%lx S: 0x%lx R: 0x%lx\n", | |
145 | now - midEntry->when_alloc, | |
146 | now - midEntry->when_sent, | |
147 | now - midEntry->when_received); | |
1047abc1 SF |
148 | } |
149 | } | |
150 | #endif | |
f1f27ad7 | 151 | put_task_struct(midEntry->creator); |
abe57073 PS |
152 | |
153 | mempool_free(midEntry, cifs_mid_poolp); | |
154 | } | |
155 | ||
70f08f91 | 156 | void release_mid(struct mid_q_entry *mid) |
abe57073 | 157 | { |
70f08f91 | 158 | struct TCP_Server_Info *server = mid->server; |
d7d7a66a SP |
159 | |
160 | spin_lock(&server->mid_lock); | |
70f08f91 | 161 | kref_put(&mid->refcount, __release_mid); |
d7d7a66a | 162 | spin_unlock(&server->mid_lock); |
abe57073 PS |
163 | } |
164 | ||
3c1bf7e4 | 165 | void |
70f08f91 | 166 | delete_mid(struct mid_q_entry *mid) |
ddc8cf8f | 167 | { |
d7d7a66a | 168 | spin_lock(&mid->server->mid_lock); |
abe57073 PS |
169 | if (!(mid->mid_flags & MID_DELETED)) { |
170 | list_del_init(&mid->qhead); | |
171 | mid->mid_flags |= MID_DELETED; | |
172 | } | |
d7d7a66a | 173 | spin_unlock(&mid->server->mid_lock); |
ddc8cf8f | 174 | |
70f08f91 | 175 | release_mid(mid); |
ddc8cf8f JL |
176 | } |
177 | ||
6f49f46b JL |
178 | /* |
179 | * smb_send_kvec - send an array of kvecs to the server | |
180 | * @server: Server to send the data to | |
3ab3f2a1 | 181 | * @smb_msg: Message to send |
6f49f46b JL |
182 | * @sent: amount of data sent on socket is stored here |
183 | * | |
184 | * Our basic "send data to server" function. Should be called with srv_mutex | |
185 | * held. The caller is responsible for handling the results. | |
186 | */ | |
d6e04ae6 | 187 | static int |
3ab3f2a1 AV |
188 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
189 | size_t *sent) | |
1da177e4 LT |
190 | { |
191 | int rc = 0; | |
3ab3f2a1 | 192 | int retries = 0; |
edf1ae40 | 193 | struct socket *ssocket = server->ssocket; |
50c2f753 | 194 | |
6f49f46b JL |
195 | *sent = 0; |
196 | ||
0496e02d | 197 | if (server->noblocksnd) |
3ab3f2a1 | 198 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 199 | else |
3ab3f2a1 | 200 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 201 | |
3ab3f2a1 | 202 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
203 | /* |
204 | * If blocking send, we try 3 times, since each can block | |
205 | * for 5 seconds. For nonblocking we have to try more | |
206 | * but wait increasing amounts of time allowing time for | |
207 | * socket to clear. The overall time we wait in either | |
208 | * case to send on the socket is about 15 seconds. | |
209 | * Similarly we wait for 15 seconds for a response from | |
210 | * the server in SendReceive[2] for the server to send | |
211 | * a response back for most types of requests (except | |
212 | * SMB Write past end of file which can be slow, and | |
213 | * blocking lock operations). NFS waits slightly longer | |
214 | * than CIFS, but this can make it take longer for | |
215 | * nonresponsive servers to be detected and 15 seconds | |
216 | * is more than enough time for modern networks to | |
217 | * send a packet. In most cases if we fail to send | |
218 | * after the retries we will kill the socket and | |
219 | * reconnect which may clear the network problem. | |
220 | */ | |
3ab3f2a1 | 221 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 222 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
223 | retries++; |
224 | if (retries >= 14 || | |
225 | (!server->noblocksnd && (retries > 2))) { | |
afe6f653 | 226 | cifs_server_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
f96637be | 227 | ssocket); |
3ab3f2a1 | 228 | return -EAGAIN; |
1da177e4 | 229 | } |
3ab3f2a1 | 230 | msleep(1 << retries); |
1da177e4 LT |
231 | continue; |
232 | } | |
6f49f46b | 233 | |
79a58d1f | 234 | if (rc < 0) |
3ab3f2a1 | 235 | return rc; |
6f49f46b | 236 | |
79a58d1f | 237 | if (rc == 0) { |
3e84469d SF |
238 | /* should never happen, letting socket clear before |
239 | retrying is our only obvious option here */ | |
afe6f653 | 240 | cifs_server_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
241 | msleep(500); |
242 | continue; | |
d6e04ae6 | 243 | } |
6f49f46b | 244 | |
3ab3f2a1 AV |
245 | /* send was at least partially successful */ |
246 | *sent += rc; | |
247 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 248 | } |
3ab3f2a1 | 249 | return 0; |
97bc00b3 JL |
250 | } |
251 | ||
35e2cc1b | 252 | unsigned long |
81f39f95 | 253 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
254 | { |
255 | unsigned int i; | |
35e2cc1b PA |
256 | struct kvec *iov; |
257 | int nvec; | |
a26054d1 JL |
258 | unsigned long buflen = 0; |
259 | ||
d291e703 | 260 | if (!is_smb1(server) && rqst->rq_nvec >= 2 && |
9789de8b | 261 | rqst->rq_iov[0].iov_len == 4) { |
35e2cc1b PA |
262 | iov = &rqst->rq_iov[1]; |
263 | nvec = rqst->rq_nvec - 1; | |
264 | } else { | |
265 | iov = rqst->rq_iov; | |
266 | nvec = rqst->rq_nvec; | |
267 | } | |
268 | ||
a26054d1 | 269 | /* total up iov array first */ |
35e2cc1b | 270 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
271 | buflen += iov[i].iov_len; |
272 | ||
c06a0f2d LL |
273 | /* |
274 | * Add in the page array if there is one. The caller needs to make | |
275 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
276 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
277 | * PAGE_SIZE. | |
278 | */ | |
a26054d1 | 279 | if (rqst->rq_npages) { |
c06a0f2d LL |
280 | if (rqst->rq_npages == 1) |
281 | buflen += rqst->rq_tailsz; | |
282 | else { | |
283 | /* | |
284 | * If there is more than one page, calculate the | |
285 | * buffer length based on rq_offset and rq_tailsz | |
286 | */ | |
287 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
288 | rqst->rq_offset; | |
289 | buflen += rqst->rq_tailsz; | |
290 | } | |
a26054d1 JL |
291 | } |
292 | ||
293 | return buflen; | |
294 | } | |
295 | ||
6f49f46b | 296 | static int |
07cd952f RS |
297 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
298 | struct smb_rqst *rqst) | |
6f49f46b | 299 | { |
07cd952f RS |
300 | int rc = 0; |
301 | struct kvec *iov; | |
302 | int n_vec; | |
303 | unsigned int send_length = 0; | |
304 | unsigned int i, j; | |
b30c74c7 | 305 | sigset_t mask, oldmask; |
3ab3f2a1 | 306 | size_t total_len = 0, sent, size; |
b8eed283 | 307 | struct socket *ssocket = server->ssocket; |
bedc8f76 | 308 | struct msghdr smb_msg = {}; |
c713c877 RS |
309 | __be32 rfc1002_marker; |
310 | ||
4357d45f LL |
311 | if (cifs_rdma_enabled(server)) { |
312 | /* return -EAGAIN when connecting or reconnecting */ | |
313 | rc = -EAGAIN; | |
314 | if (server->smbd_conn) | |
315 | rc = smbd_send(server, num_rqst, rqst); | |
9762c2d0 LL |
316 | goto smbd_done; |
317 | } | |
afc18a6f | 318 | |
ea702b80 | 319 | if (ssocket == NULL) |
afc18a6f | 320 | return -EAGAIN; |
ea702b80 | 321 | |
214a5ea0 | 322 | if (fatal_signal_pending(current)) { |
6988a619 PA |
323 | cifs_dbg(FYI, "signal pending before send request\n"); |
324 | return -ERESTARTSYS; | |
b30c74c7 PS |
325 | } |
326 | ||
b8eed283 | 327 | /* cork the socket */ |
db10538a | 328 | tcp_sock_set_cork(ssocket->sk, true); |
b8eed283 | 329 | |
07cd952f | 330 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 331 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
332 | rfc1002_marker = cpu_to_be32(send_length); |
333 | ||
b30c74c7 PS |
334 | /* |
335 | * We should not allow signals to interrupt the network send because | |
336 | * any partial send will cause session reconnects thus increasing | |
337 | * latency of system calls and overload a server with unnecessary | |
338 | * requests. | |
339 | */ | |
340 | ||
341 | sigfillset(&mask); | |
342 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
343 | ||
c713c877 | 344 | /* Generate a rfc1002 marker for SMB2+ */ |
d291e703 | 345 | if (!is_smb1(server)) { |
c713c877 RS |
346 | struct kvec hiov = { |
347 | .iov_base = &rfc1002_marker, | |
348 | .iov_len = 4 | |
349 | }; | |
aa563d7b | 350 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
351 | rc = smb_send_kvec(server, &smb_msg, &sent); |
352 | if (rc < 0) | |
b30c74c7 | 353 | goto unmask; |
c713c877 RS |
354 | |
355 | total_len += sent; | |
356 | send_length += 4; | |
357 | } | |
358 | ||
662bf5bc PA |
359 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
360 | ||
07cd952f RS |
361 | for (j = 0; j < num_rqst; j++) { |
362 | iov = rqst[j].rq_iov; | |
363 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 364 | |
07cd952f | 365 | size = 0; |
662bf5bc PA |
366 | for (i = 0; i < n_vec; i++) { |
367 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 368 | size += iov[i].iov_len; |
662bf5bc | 369 | } |
97bc00b3 | 370 | |
aa563d7b | 371 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 372 | |
3ab3f2a1 | 373 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 374 | if (rc < 0) |
b30c74c7 | 375 | goto unmask; |
97bc00b3 JL |
376 | |
377 | total_len += sent; | |
07cd952f RS |
378 | |
379 | /* now walk the page array and send each page in it */ | |
380 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
381 | struct bio_vec bvec; | |
382 | ||
383 | bvec.bv_page = rqst[j].rq_pages[i]; | |
384 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
385 | &bvec.bv_offset); | |
386 | ||
aa563d7b | 387 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
388 | &bvec, 1, bvec.bv_len); |
389 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
390 | if (rc < 0) | |
391 | break; | |
392 | ||
393 | total_len += sent; | |
394 | } | |
97bc00b3 | 395 | } |
1da177e4 | 396 | |
b30c74c7 PS |
397 | unmask: |
398 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
399 | ||
400 | /* | |
401 | * If signal is pending but we have already sent the whole packet to | |
402 | * the server we need to return success status to allow a corresponding | |
403 | * mid entry to be kept in the pending requests queue thus allowing | |
404 | * to handle responses from the server by the client. | |
405 | * | |
406 | * If only part of the packet has been sent there is no need to hide | |
407 | * interrupt because the session will be reconnected anyway, so there | |
408 | * won't be any response from the server to handle. | |
409 | */ | |
410 | ||
411 | if (signal_pending(current) && (total_len != send_length)) { | |
412 | cifs_dbg(FYI, "signal is pending after attempt to send\n"); | |
214a5ea0 | 413 | rc = -ERESTARTSYS; |
b30c74c7 PS |
414 | } |
415 | ||
b8eed283 | 416 | /* uncork it */ |
db10538a | 417 | tcp_sock_set_cork(ssocket->sk, false); |
b8eed283 | 418 | |
c713c877 | 419 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 420 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 421 | send_length, total_len); |
6f49f46b JL |
422 | /* |
423 | * If we have only sent part of an SMB then the next SMB could | |
424 | * be taken as the remainder of this one. We need to kill the | |
425 | * socket so the server throws away the partial SMB | |
426 | */ | |
dca65818 | 427 | cifs_signal_cifsd_for_reconnect(server, false); |
bf1fdeb7 | 428 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
6d82c27a | 429 | server->conn_id, server->hostname); |
edf1ae40 | 430 | } |
9762c2d0 | 431 | smbd_done: |
d804d41d | 432 | if (rc < 0 && rc != -EINTR) |
afe6f653 | 433 | cifs_server_dbg(VFS, "Error %d sending data on socket to server\n", |
f96637be | 434 | rc); |
ee13919c | 435 | else if (rc > 0) |
1da177e4 | 436 | rc = 0; |
1da177e4 LT |
437 | |
438 | return rc; | |
439 | } | |
440 | ||
6f49f46b | 441 | static int |
1f3a8f5f RS |
442 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
443 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 444 | { |
b2c96de7 | 445 | struct kvec iov; |
3946d0d0 | 446 | struct smb2_transform_hdr *tr_hdr; |
b2c96de7 | 447 | struct smb_rqst cur_rqst[MAX_COMPOUND]; |
7fb8986e PS |
448 | int rc; |
449 | ||
450 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
451 | return __smb_send_rqst(server, num_rqst, rqst); |
452 | ||
453 | if (num_rqst > MAX_COMPOUND - 1) | |
454 | return -ENOMEM; | |
7fb8986e | 455 | |
b2c96de7 | 456 | if (!server->ops->init_transform_rq) { |
a0a3036b | 457 | cifs_server_dbg(VFS, "Encryption requested but transform callback is missing\n"); |
7fb8986e PS |
458 | return -EIO; |
459 | } | |
6f49f46b | 460 | |
9339faac | 461 | tr_hdr = kzalloc(sizeof(*tr_hdr), GFP_NOFS); |
3946d0d0 LL |
462 | if (!tr_hdr) |
463 | return -ENOMEM; | |
464 | ||
465 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); | |
466 | memset(&iov, 0, sizeof(iov)); | |
3946d0d0 LL |
467 | |
468 | iov.iov_base = tr_hdr; | |
469 | iov.iov_len = sizeof(*tr_hdr); | |
470 | cur_rqst[0].rq_iov = &iov; | |
471 | cur_rqst[0].rq_nvec = 1; | |
472 | ||
1f3a8f5f RS |
473 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
474 | &cur_rqst[0], rqst); | |
7fb8986e | 475 | if (rc) |
3946d0d0 | 476 | goto out; |
7fb8986e | 477 | |
1f3a8f5f RS |
478 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
479 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
3946d0d0 LL |
480 | out: |
481 | kfree(tr_hdr); | |
7fb8986e | 482 | return rc; |
6f49f46b JL |
483 | } |
484 | ||
0496e02d JL |
485 | int |
486 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
487 | unsigned int smb_buf_length) | |
488 | { | |
738f9de5 | 489 | struct kvec iov[2]; |
7fb8986e PS |
490 | struct smb_rqst rqst = { .rq_iov = iov, |
491 | .rq_nvec = 2 }; | |
0496e02d | 492 | |
738f9de5 PS |
493 | iov[0].iov_base = smb_buffer; |
494 | iov[0].iov_len = 4; | |
495 | iov[1].iov_base = (char *)smb_buffer + 4; | |
496 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 497 | |
07cd952f | 498 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
499 | } |
500 | ||
fc40f9cf | 501 | static int |
b227d215 | 502 | wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits, |
2b53b929 RS |
503 | const int timeout, const int flags, |
504 | unsigned int *instance) | |
1da177e4 | 505 | { |
19e88867 | 506 | long rc; |
4230cff8 RS |
507 | int *credits; |
508 | int optype; | |
2b53b929 | 509 | long int t; |
6d82c27a | 510 | int scredits, in_flight; |
2b53b929 RS |
511 | |
512 | if (timeout < 0) | |
513 | t = MAX_JIFFY_OFFSET; | |
514 | else | |
515 | t = msecs_to_jiffies(timeout); | |
4230cff8 RS |
516 | |
517 | optype = flags & CIFS_OP_MASK; | |
5bc59498 | 518 | |
34f4deb7 PS |
519 | *instance = 0; |
520 | ||
4230cff8 RS |
521 | credits = server->ops->get_credits_field(server, optype); |
522 | /* Since an echo is already inflight, no need to wait to send another */ | |
523 | if (*credits <= 0 && optype == CIFS_ECHO_OP) | |
524 | return -EAGAIN; | |
525 | ||
fc40f9cf | 526 | spin_lock(&server->req_lock); |
392e1c5d | 527 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_NON_BLOCKING) { |
1da177e4 | 528 | /* oplock breaks must not be held up */ |
fc40f9cf | 529 | server->in_flight++; |
1b63f184 SF |
530 | if (server->in_flight > server->max_in_flight) |
531 | server->max_in_flight = server->in_flight; | |
bc205ed1 | 532 | *credits -= 1; |
34f4deb7 | 533 | *instance = server->reconnect_instance; |
6d82c27a SP |
534 | scredits = *credits; |
535 | in_flight = server->in_flight; | |
fc40f9cf | 536 | spin_unlock(&server->req_lock); |
6d82c27a | 537 | |
1ddff774 | 538 | trace_smb3_nblk_credits(server->CurrentMid, |
6d82c27a SP |
539 | server->conn_id, server->hostname, scredits, -1, in_flight); |
540 | cifs_dbg(FYI, "%s: remove %u credits total=%d\n", | |
541 | __func__, 1, scredits); | |
542 | ||
27a97a61 VL |
543 | return 0; |
544 | } | |
545 | ||
27a97a61 | 546 | while (1) { |
b227d215 | 547 | if (*credits < num_credits) { |
6d82c27a | 548 | scredits = *credits; |
fc40f9cf | 549 | spin_unlock(&server->req_lock); |
6d82c27a | 550 | |
789e6661 | 551 | cifs_num_waiters_inc(server); |
2b53b929 RS |
552 | rc = wait_event_killable_timeout(server->request_q, |
553 | has_credits(server, credits, num_credits), t); | |
789e6661 | 554 | cifs_num_waiters_dec(server); |
2b53b929 | 555 | if (!rc) { |
6d82c27a SP |
556 | spin_lock(&server->req_lock); |
557 | scredits = *credits; | |
558 | in_flight = server->in_flight; | |
559 | spin_unlock(&server->req_lock); | |
560 | ||
7937ca96 | 561 | trace_smb3_credit_timeout(server->CurrentMid, |
6d82c27a SP |
562 | server->conn_id, server->hostname, scredits, |
563 | num_credits, in_flight); | |
afe6f653 | 564 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
6d82c27a | 565 | timeout); |
7de03948 | 566 | return -EBUSY; |
2b53b929 RS |
567 | } |
568 | if (rc == -ERESTARTSYS) | |
569 | return -ERESTARTSYS; | |
fc40f9cf | 570 | spin_lock(&server->req_lock); |
27a97a61 | 571 | } else { |
080dc5e5 SP |
572 | spin_unlock(&server->req_lock); |
573 | ||
d7d7a66a | 574 | spin_lock(&server->srv_lock); |
c5797a94 | 575 | if (server->tcpStatus == CifsExiting) { |
d7d7a66a | 576 | spin_unlock(&server->srv_lock); |
27a97a61 | 577 | return -ENOENT; |
1da177e4 | 578 | } |
d7d7a66a | 579 | spin_unlock(&server->srv_lock); |
27a97a61 | 580 | |
16b34aa4 RS |
581 | /* |
582 | * For normal commands, reserve the last MAX_COMPOUND | |
583 | * credits to compound requests. | |
584 | * Otherwise these compounds could be permanently | |
585 | * starved for credits by single-credit requests. | |
586 | * | |
587 | * To prevent spinning CPU, block this thread until | |
588 | * there are >MAX_COMPOUND credits available. | |
589 | * But only do this is we already have a lot of | |
590 | * credits in flight to avoid triggering this check | |
591 | * for servers that are slow to hand out credits on | |
592 | * new sessions. | |
593 | */ | |
080dc5e5 | 594 | spin_lock(&server->req_lock); |
16b34aa4 RS |
595 | if (!optype && num_credits == 1 && |
596 | server->in_flight > 2 * MAX_COMPOUND && | |
597 | *credits <= MAX_COMPOUND) { | |
598 | spin_unlock(&server->req_lock); | |
6d82c27a | 599 | |
16b34aa4 | 600 | cifs_num_waiters_inc(server); |
2b53b929 RS |
601 | rc = wait_event_killable_timeout( |
602 | server->request_q, | |
16b34aa4 | 603 | has_credits(server, credits, |
2b53b929 RS |
604 | MAX_COMPOUND + 1), |
605 | t); | |
16b34aa4 | 606 | cifs_num_waiters_dec(server); |
2b53b929 | 607 | if (!rc) { |
6d82c27a SP |
608 | spin_lock(&server->req_lock); |
609 | scredits = *credits; | |
610 | in_flight = server->in_flight; | |
611 | spin_unlock(&server->req_lock); | |
612 | ||
7937ca96 | 613 | trace_smb3_credit_timeout( |
6d82c27a SP |
614 | server->CurrentMid, |
615 | server->conn_id, server->hostname, | |
616 | scredits, num_credits, in_flight); | |
afe6f653 | 617 | cifs_server_dbg(VFS, "wait timed out after %d ms\n", |
6d82c27a | 618 | timeout); |
7de03948 | 619 | return -EBUSY; |
2b53b929 RS |
620 | } |
621 | if (rc == -ERESTARTSYS) | |
622 | return -ERESTARTSYS; | |
16b34aa4 RS |
623 | spin_lock(&server->req_lock); |
624 | continue; | |
625 | } | |
626 | ||
2d86dbc9 PS |
627 | /* |
628 | * Can not count locking commands against total | |
629 | * as they are allowed to block on server. | |
630 | */ | |
27a97a61 VL |
631 | |
632 | /* update # of requests on the wire to server */ | |
4230cff8 | 633 | if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) { |
b227d215 RS |
634 | *credits -= num_credits; |
635 | server->in_flight += num_credits; | |
1b63f184 SF |
636 | if (server->in_flight > server->max_in_flight) |
637 | server->max_in_flight = server->in_flight; | |
34f4deb7 | 638 | *instance = server->reconnect_instance; |
2d86dbc9 | 639 | } |
6d82c27a SP |
640 | scredits = *credits; |
641 | in_flight = server->in_flight; | |
fc40f9cf | 642 | spin_unlock(&server->req_lock); |
cd7b699b | 643 | |
1ddff774 | 644 | trace_smb3_waitff_credits(server->CurrentMid, |
6d82c27a SP |
645 | server->conn_id, server->hostname, scredits, |
646 | -(num_credits), in_flight); | |
cd7b699b SP |
647 | cifs_dbg(FYI, "%s: remove %u credits total=%d\n", |
648 | __func__, num_credits, scredits); | |
27a97a61 | 649 | break; |
1da177e4 LT |
650 | } |
651 | } | |
7ee1af76 JA |
652 | return 0; |
653 | } | |
1da177e4 | 654 | |
bc205ed1 | 655 | static int |
480b1cb9 RS |
656 | wait_for_free_request(struct TCP_Server_Info *server, const int flags, |
657 | unsigned int *instance) | |
bc205ed1 | 658 | { |
2b53b929 RS |
659 | return wait_for_free_credits(server, 1, -1, flags, |
660 | instance); | |
bc205ed1 PS |
661 | } |
662 | ||
257b7809 RS |
663 | static int |
664 | wait_for_compound_request(struct TCP_Server_Info *server, int num, | |
665 | const int flags, unsigned int *instance) | |
666 | { | |
667 | int *credits; | |
6d82c27a | 668 | int scredits, in_flight; |
257b7809 RS |
669 | |
670 | credits = server->ops->get_credits_field(server, flags & CIFS_OP_MASK); | |
671 | ||
672 | spin_lock(&server->req_lock); | |
cd7b699b | 673 | scredits = *credits; |
6d82c27a | 674 | in_flight = server->in_flight; |
cd7b699b | 675 | |
257b7809 RS |
676 | if (*credits < num) { |
677 | /* | |
91792bb8 PS |
678 | * If the server is tight on resources or just gives us less |
679 | * credits for other reasons (e.g. requests are coming out of | |
680 | * order and the server delays granting more credits until it | |
681 | * processes a missing mid) and we exhausted most available | |
682 | * credits there may be situations when we try to send | |
683 | * a compound request but we don't have enough credits. At this | |
684 | * point the client needs to decide if it should wait for | |
685 | * additional credits or fail the request. If at least one | |
686 | * request is in flight there is a high probability that the | |
687 | * server will return enough credits to satisfy this compound | |
688 | * request. | |
689 | * | |
690 | * Return immediately if no requests in flight since we will be | |
691 | * stuck on waiting for credits. | |
257b7809 | 692 | */ |
91792bb8 | 693 | if (server->in_flight == 0) { |
257b7809 | 694 | spin_unlock(&server->req_lock); |
cd7b699b | 695 | trace_smb3_insufficient_credits(server->CurrentMid, |
6d82c27a SP |
696 | server->conn_id, server->hostname, scredits, |
697 | num, in_flight); | |
cd7b699b | 698 | cifs_dbg(FYI, "%s: %d requests in flight, needed %d total=%d\n", |
6d82c27a | 699 | __func__, in_flight, num, scredits); |
7de03948 | 700 | return -EDEADLK; |
257b7809 RS |
701 | } |
702 | } | |
703 | spin_unlock(&server->req_lock); | |
704 | ||
705 | return wait_for_free_credits(server, num, 60000, flags, | |
706 | instance); | |
707 | } | |
708 | ||
cb7e9eab PS |
709 | int |
710 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
335b7b62 | 711 | unsigned int *num, struct cifs_credits *credits) |
cb7e9eab PS |
712 | { |
713 | *num = size; | |
335b7b62 PS |
714 | credits->value = 0; |
715 | credits->instance = server->reconnect_instance; | |
cb7e9eab PS |
716 | return 0; |
717 | } | |
718 | ||
96daf2b0 | 719 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
720 | struct mid_q_entry **ppmidQ) |
721 | { | |
d7d7a66a | 722 | spin_lock(&ses->ses_lock); |
dd3cd870 | 723 | if (ses->ses_status == SES_NEW) { |
79a58d1f | 724 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
080dc5e5 | 725 | (in_buf->Command != SMB_COM_NEGOTIATE)) { |
d7d7a66a | 726 | spin_unlock(&ses->ses_lock); |
7ee1af76 | 727 | return -EAGAIN; |
080dc5e5 | 728 | } |
ad7a2926 | 729 | /* else ok - we are setting up session */ |
1da177e4 | 730 | } |
7f48558e | 731 | |
dd3cd870 | 732 | if (ses->ses_status == SES_EXITING) { |
7f48558e | 733 | /* check if SMB session is bad because we are setting it up */ |
080dc5e5 | 734 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) { |
d7d7a66a | 735 | spin_unlock(&ses->ses_lock); |
7f48558e | 736 | return -EAGAIN; |
080dc5e5 | 737 | } |
7f48558e SP |
738 | /* else ok - we are shutting down session */ |
739 | } | |
d7d7a66a | 740 | spin_unlock(&ses->ses_lock); |
7f48558e | 741 | |
70f08f91 | 742 | *ppmidQ = alloc_mid(in_buf, ses->server); |
26f57364 | 743 | if (*ppmidQ == NULL) |
7ee1af76 | 744 | return -ENOMEM; |
d7d7a66a | 745 | spin_lock(&ses->server->mid_lock); |
ddc8cf8f | 746 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); |
d7d7a66a | 747 | spin_unlock(&ses->server->mid_lock); |
7ee1af76 JA |
748 | return 0; |
749 | } | |
750 | ||
0ade640e JL |
751 | static int |
752 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 753 | { |
0ade640e | 754 | int error; |
7ee1af76 | 755 | |
f5d39b02 PZ |
756 | error = wait_event_state(server->response_q, |
757 | midQ->mid_state != MID_REQUEST_SUBMITTED, | |
758 | (TASK_KILLABLE|TASK_FREEZABLE_UNSAFE)); | |
0ade640e JL |
759 | if (error < 0) |
760 | return -ERESTARTSYS; | |
7ee1af76 | 761 | |
0ade640e | 762 | return 0; |
7ee1af76 JA |
763 | } |
764 | ||
fec344e3 JL |
765 | struct mid_q_entry * |
766 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
767 | { |
768 | int rc; | |
fec344e3 | 769 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
770 | struct mid_q_entry *mid; |
771 | ||
738f9de5 PS |
772 | if (rqst->rq_iov[0].iov_len != 4 || |
773 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
774 | return ERR_PTR(-EIO); | |
775 | ||
792af7b0 | 776 | /* enable signing if server requires it */ |
38d77c50 | 777 | if (server->sign) |
792af7b0 PS |
778 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
779 | ||
70f08f91 | 780 | mid = alloc_mid(hdr, server); |
792af7b0 | 781 | if (mid == NULL) |
fec344e3 | 782 | return ERR_PTR(-ENOMEM); |
792af7b0 | 783 | |
fec344e3 | 784 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb | 785 | if (rc) { |
70f08f91 | 786 | release_mid(mid); |
fec344e3 | 787 | return ERR_PTR(rc); |
ffc61ccb SP |
788 | } |
789 | ||
fec344e3 | 790 | return mid; |
792af7b0 | 791 | } |
133672ef | 792 | |
a6827c18 JL |
793 | /* |
794 | * Send a SMB request and set the callback function in the mid to handle | |
795 | * the result. Caller is responsible for dealing with timeouts. | |
796 | */ | |
797 | int | |
fec344e3 | 798 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 | 799 | mid_receive_t *receive, mid_callback_t *callback, |
3349c3a7 PS |
800 | mid_handle_t *handle, void *cbdata, const int flags, |
801 | const struct cifs_credits *exist_credits) | |
a6827c18 | 802 | { |
480b1cb9 | 803 | int rc; |
a6827c18 | 804 | struct mid_q_entry *mid; |
335b7b62 | 805 | struct cifs_credits credits = { .value = 0, .instance = 0 }; |
34f4deb7 | 806 | unsigned int instance; |
480b1cb9 | 807 | int optype; |
a6827c18 | 808 | |
a891f0f8 PS |
809 | optype = flags & CIFS_OP_MASK; |
810 | ||
cb7e9eab | 811 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
480b1cb9 | 812 | rc = wait_for_free_request(server, flags, &instance); |
cb7e9eab PS |
813 | if (rc) |
814 | return rc; | |
335b7b62 | 815 | credits.value = 1; |
34f4deb7 | 816 | credits.instance = instance; |
3349c3a7 PS |
817 | } else |
818 | instance = exist_credits->instance; | |
a6827c18 | 819 | |
cc391b69 | 820 | cifs_server_lock(server); |
3349c3a7 PS |
821 | |
822 | /* | |
823 | * We can't use credits obtained from the previous session to send this | |
824 | * request. Check if there were reconnects after we obtained credits and | |
825 | * return -EAGAIN in such cases to let callers handle it. | |
826 | */ | |
827 | if (instance != server->reconnect_instance) { | |
cc391b69 | 828 | cifs_server_unlock(server); |
3349c3a7 PS |
829 | add_credits_and_wake_if(server, &credits, optype); |
830 | return -EAGAIN; | |
831 | } | |
832 | ||
fec344e3 JL |
833 | mid = server->ops->setup_async_request(server, rqst); |
834 | if (IS_ERR(mid)) { | |
cc391b69 | 835 | cifs_server_unlock(server); |
335b7b62 | 836 | add_credits_and_wake_if(server, &credits, optype); |
fec344e3 | 837 | return PTR_ERR(mid); |
a6827c18 JL |
838 | } |
839 | ||
44d22d84 | 840 | mid->receive = receive; |
a6827c18 JL |
841 | mid->callback = callback; |
842 | mid->callback_data = cbdata; | |
9b7c18a2 | 843 | mid->handle = handle; |
7c9421e1 | 844 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 845 | |
ffc61ccb | 846 | /* put it on the pending_mid_q */ |
d7d7a66a | 847 | spin_lock(&server->mid_lock); |
ffc61ccb | 848 | list_add_tail(&mid->qhead, &server->pending_mid_q); |
d7d7a66a | 849 | spin_unlock(&server->mid_lock); |
ffc61ccb | 850 | |
93d2cb6c LL |
851 | /* |
852 | * Need to store the time in mid before calling I/O. For call_async, | |
853 | * I/O response may come back and free the mid entry on another thread. | |
854 | */ | |
855 | cifs_save_when_sent(mid); | |
789e6661 | 856 | cifs_in_send_inc(server); |
1f3a8f5f | 857 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 858 | cifs_in_send_dec(server); |
ad313cb8 | 859 | |
820962dc | 860 | if (rc < 0) { |
c781af7e | 861 | revert_current_mid(server, mid->credits); |
ad313cb8 | 862 | server->sequence_number -= 2; |
70f08f91 | 863 | delete_mid(mid); |
820962dc RV |
864 | } |
865 | ||
cc391b69 | 866 | cifs_server_unlock(server); |
789e6661 | 867 | |
ffc61ccb SP |
868 | if (rc == 0) |
869 | return 0; | |
a6827c18 | 870 | |
335b7b62 | 871 | add_credits_and_wake_if(server, &credits, optype); |
a6827c18 JL |
872 | return rc; |
873 | } | |
874 | ||
133672ef SF |
875 | /* |
876 | * | |
877 | * Send an SMB Request. No response info (other than return code) | |
878 | * needs to be parsed. | |
879 | * | |
880 | * flags indicate the type of request buffer and how long to wait | |
881 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
882 | * | |
883 | */ | |
884 | int | |
96daf2b0 | 885 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 886 | char *in_buf, int flags) |
133672ef SF |
887 | { |
888 | int rc; | |
889 | struct kvec iov[1]; | |
da502f7d | 890 | struct kvec rsp_iov; |
133672ef SF |
891 | int resp_buf_type; |
892 | ||
792af7b0 PS |
893 | iov[0].iov_base = in_buf; |
894 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
392e1c5d | 895 | flags |= CIFS_NO_RSP_BUF; |
da502f7d | 896 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 897 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 898 | |
133672ef SF |
899 | return rc; |
900 | } | |
901 | ||
053d5034 | 902 | static int |
3c1105df | 903 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
904 | { |
905 | int rc = 0; | |
906 | ||
f96637be JP |
907 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
908 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 909 | |
d7d7a66a | 910 | spin_lock(&server->mid_lock); |
7c9421e1 | 911 | switch (mid->mid_state) { |
74dd92a8 | 912 | case MID_RESPONSE_RECEIVED: |
d7d7a66a | 913 | spin_unlock(&server->mid_lock); |
053d5034 | 914 | return rc; |
74dd92a8 JL |
915 | case MID_RETRY_NEEDED: |
916 | rc = -EAGAIN; | |
917 | break; | |
71823baf JL |
918 | case MID_RESPONSE_MALFORMED: |
919 | rc = -EIO; | |
920 | break; | |
3c1105df JL |
921 | case MID_SHUTDOWN: |
922 | rc = -EHOSTDOWN; | |
923 | break; | |
74dd92a8 | 924 | default: |
abe57073 PS |
925 | if (!(mid->mid_flags & MID_DELETED)) { |
926 | list_del_init(&mid->qhead); | |
927 | mid->mid_flags |= MID_DELETED; | |
928 | } | |
afe6f653 | 929 | cifs_server_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
f96637be | 930 | __func__, mid->mid, mid->mid_state); |
74dd92a8 | 931 | rc = -EIO; |
053d5034 | 932 | } |
d7d7a66a | 933 | spin_unlock(&server->mid_lock); |
053d5034 | 934 | |
70f08f91 | 935 | release_mid(mid); |
053d5034 JL |
936 | return rc; |
937 | } | |
938 | ||
121b046a | 939 | static inline int |
fb2036d8 PS |
940 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
941 | struct mid_q_entry *mid) | |
76dcc26f | 942 | { |
121b046a | 943 | return server->ops->send_cancel ? |
fb2036d8 | 944 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
945 | } |
946 | ||
2c8f981d JL |
947 | int |
948 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
949 | bool log_error) | |
950 | { | |
792af7b0 | 951 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
952 | |
953 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
954 | |
955 | /* convert the length into a more usable form */ | |
38d77c50 | 956 | if (server->sign) { |
738f9de5 | 957 | struct kvec iov[2]; |
985e4ff0 | 958 | int rc = 0; |
738f9de5 PS |
959 | struct smb_rqst rqst = { .rq_iov = iov, |
960 | .rq_nvec = 2 }; | |
826a95e4 | 961 | |
738f9de5 PS |
962 | iov[0].iov_base = mid->resp_buf; |
963 | iov[0].iov_len = 4; | |
964 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
965 | iov[1].iov_len = len - 4; | |
2c8f981d | 966 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 967 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 968 | mid->sequence_number); |
985e4ff0 | 969 | if (rc) |
afe6f653 | 970 | cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n", |
f96637be | 971 | rc); |
2c8f981d JL |
972 | } |
973 | ||
974 | /* BB special case reconnect tid and uid here? */ | |
a3713ec3 | 975 | return map_and_check_smb_error(mid, log_error); |
2c8f981d JL |
976 | } |
977 | ||
fec344e3 | 978 | struct mid_q_entry * |
f780bd3f AA |
979 | cifs_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *ignored, |
980 | struct smb_rqst *rqst) | |
792af7b0 PS |
981 | { |
982 | int rc; | |
fec344e3 | 983 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
984 | struct mid_q_entry *mid; |
985 | ||
738f9de5 PS |
986 | if (rqst->rq_iov[0].iov_len != 4 || |
987 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
988 | return ERR_PTR(-EIO); | |
989 | ||
792af7b0 PS |
990 | rc = allocate_mid(ses, hdr, &mid); |
991 | if (rc) | |
fec344e3 JL |
992 | return ERR_PTR(rc); |
993 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
994 | if (rc) { | |
70f08f91 | 995 | delete_mid(mid); |
fec344e3 JL |
996 | return ERR_PTR(rc); |
997 | } | |
998 | return mid; | |
792af7b0 PS |
999 | } |
1000 | ||
4e34feb5 | 1001 | static void |
ee258d79 | 1002 | cifs_compound_callback(struct mid_q_entry *mid) |
8a26f0f7 PS |
1003 | { |
1004 | struct TCP_Server_Info *server = mid->server; | |
34f4deb7 PS |
1005 | struct cifs_credits credits; |
1006 | ||
1007 | credits.value = server->ops->get_credits(mid); | |
1008 | credits.instance = server->reconnect_instance; | |
8a26f0f7 | 1009 | |
34f4deb7 | 1010 | add_credits(server, &credits, mid->optype); |
8a26f0f7 PS |
1011 | } |
1012 | ||
ee258d79 PS |
1013 | static void |
1014 | cifs_compound_last_callback(struct mid_q_entry *mid) | |
1015 | { | |
1016 | cifs_compound_callback(mid); | |
1017 | cifs_wake_up_task(mid); | |
1018 | } | |
1019 | ||
1020 | static void | |
1021 | cifs_cancelled_callback(struct mid_q_entry *mid) | |
1022 | { | |
1023 | cifs_compound_callback(mid); | |
70f08f91 | 1024 | release_mid(mid); |
ee258d79 PS |
1025 | } |
1026 | ||
5f68ea4a AA |
1027 | /* |
1028 | * Return a channel (master if none) of @ses that can be used to send | |
1029 | * regular requests. | |
1030 | * | |
1031 | * If we are currently binding a new channel (negprot/sess.setup), | |
1032 | * return the new incomplete channel. | |
1033 | */ | |
1034 | struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses) | |
1035 | { | |
1036 | uint index = 0; | |
1037 | ||
1038 | if (!ses) | |
1039 | return NULL; | |
1040 | ||
f486ef8e | 1041 | /* round robin */ |
bda487ac | 1042 | index = (uint)atomic_inc_return(&ses->chan_seq); |
88b024f5 SP |
1043 | |
1044 | spin_lock(&ses->chan_lock); | |
bda487ac | 1045 | index %= ses->chan_count; |
88b024f5 | 1046 | spin_unlock(&ses->chan_lock); |
f486ef8e SP |
1047 | |
1048 | return ses->chans[index].server; | |
5f68ea4a AA |
1049 | } |
1050 | ||
b8f57ee8 | 1051 | int |
e0bba0b8 | 1052 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
352d96f3 | 1053 | struct TCP_Server_Info *server, |
e0bba0b8 RS |
1054 | const int flags, const int num_rqst, struct smb_rqst *rqst, |
1055 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 1056 | { |
480b1cb9 | 1057 | int i, j, optype, rc = 0; |
e0bba0b8 | 1058 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
8544f4aa | 1059 | bool cancelled_mid[MAX_COMPOUND] = {false}; |
34f4deb7 PS |
1060 | struct cifs_credits credits[MAX_COMPOUND] = { |
1061 | { .value = 0, .instance = 0 } | |
1062 | }; | |
1063 | unsigned int instance; | |
738f9de5 | 1064 | char *buf; |
50c2f753 | 1065 | |
a891f0f8 | 1066 | optype = flags & CIFS_OP_MASK; |
133672ef | 1067 | |
e0bba0b8 RS |
1068 | for (i = 0; i < num_rqst; i++) |
1069 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 | 1070 | |
352d96f3 | 1071 | if (!ses || !ses->server || !server) { |
f96637be | 1072 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
1073 | return -EIO; |
1074 | } | |
1075 | ||
d7d7a66a | 1076 | spin_lock(&server->srv_lock); |
080dc5e5 | 1077 | if (server->tcpStatus == CifsExiting) { |
d7d7a66a | 1078 | spin_unlock(&server->srv_lock); |
7ee1af76 | 1079 | return -ENOENT; |
080dc5e5 | 1080 | } |
d7d7a66a | 1081 | spin_unlock(&server->srv_lock); |
7ee1af76 | 1082 | |
792af7b0 | 1083 | /* |
257b7809 | 1084 | * Wait for all the requests to become available. |
7091bcab PS |
1085 | * This approach still leaves the possibility to be stuck waiting for |
1086 | * credits if the server doesn't grant credits to the outstanding | |
257b7809 RS |
1087 | * requests and if the client is completely idle, not generating any |
1088 | * other requests. | |
1089 | * This can be handled by the eventual session reconnect. | |
792af7b0 | 1090 | */ |
3190b59a | 1091 | rc = wait_for_compound_request(server, num_rqst, flags, |
257b7809 RS |
1092 | &instance); |
1093 | if (rc) | |
1094 | return rc; | |
97ea4998 | 1095 | |
257b7809 RS |
1096 | for (i = 0; i < num_rqst; i++) { |
1097 | credits[i].value = 1; | |
1098 | credits[i].instance = instance; | |
8544f4aa | 1099 | } |
7ee1af76 | 1100 | |
792af7b0 PS |
1101 | /* |
1102 | * Make sure that we sign in the same order that we send on this socket | |
1103 | * and avoid races inside tcp sendmsg code that could cause corruption | |
1104 | * of smb data. | |
1105 | */ | |
7ee1af76 | 1106 | |
cc391b69 | 1107 | cifs_server_lock(server); |
7ee1af76 | 1108 | |
97ea4998 PS |
1109 | /* |
1110 | * All the parts of the compound chain belong obtained credits from the | |
257b7809 | 1111 | * same session. We can not use credits obtained from the previous |
97ea4998 PS |
1112 | * session to send this request. Check if there were reconnects after |
1113 | * we obtained credits and return -EAGAIN in such cases to let callers | |
1114 | * handle it. | |
1115 | */ | |
3190b59a | 1116 | if (instance != server->reconnect_instance) { |
cc391b69 | 1117 | cifs_server_unlock(server); |
97ea4998 | 1118 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1119 | add_credits(server, &credits[j], optype); |
97ea4998 PS |
1120 | return -EAGAIN; |
1121 | } | |
1122 | ||
e0bba0b8 | 1123 | for (i = 0; i < num_rqst; i++) { |
f780bd3f | 1124 | midQ[i] = server->ops->setup_request(ses, server, &rqst[i]); |
e0bba0b8 | 1125 | if (IS_ERR(midQ[i])) { |
3190b59a | 1126 | revert_current_mid(server, i); |
e0bba0b8 | 1127 | for (j = 0; j < i; j++) |
70f08f91 | 1128 | delete_mid(midQ[j]); |
cc391b69 | 1129 | cifs_server_unlock(server); |
8544f4aa | 1130 | |
e0bba0b8 | 1131 | /* Update # of requests on wire to server */ |
8544f4aa | 1132 | for (j = 0; j < num_rqst; j++) |
3190b59a | 1133 | add_credits(server, &credits[j], optype); |
e0bba0b8 RS |
1134 | return PTR_ERR(midQ[i]); |
1135 | } | |
1136 | ||
1137 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
8a26f0f7 | 1138 | midQ[i]->optype = optype; |
4e34feb5 | 1139 | /* |
ee258d79 PS |
1140 | * Invoke callback for every part of the compound chain |
1141 | * to calculate credits properly. Wake up this thread only when | |
1142 | * the last element is received. | |
4e34feb5 RS |
1143 | */ |
1144 | if (i < num_rqst - 1) | |
ee258d79 PS |
1145 | midQ[i]->callback = cifs_compound_callback; |
1146 | else | |
1147 | midQ[i]->callback = cifs_compound_last_callback; | |
1da177e4 | 1148 | } |
3190b59a AA |
1149 | cifs_in_send_inc(server); |
1150 | rc = smb_send_rqst(server, num_rqst, rqst, flags); | |
1151 | cifs_in_send_dec(server); | |
e0bba0b8 RS |
1152 | |
1153 | for (i = 0; i < num_rqst; i++) | |
1154 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 1155 | |
c781af7e | 1156 | if (rc < 0) { |
3190b59a AA |
1157 | revert_current_mid(server, num_rqst); |
1158 | server->sequence_number -= 2; | |
c781af7e | 1159 | } |
e0bba0b8 | 1160 | |
cc391b69 | 1161 | cifs_server_unlock(server); |
7ee1af76 | 1162 | |
d69cb728 RS |
1163 | /* |
1164 | * If sending failed for some reason or it is an oplock break that we | |
1165 | * will not receive a response to - return credits back | |
1166 | */ | |
1167 | if (rc < 0 || (flags & CIFS_NO_SRV_RSP)) { | |
ee258d79 | 1168 | for (i = 0; i < num_rqst; i++) |
3190b59a | 1169 | add_credits(server, &credits[i], optype); |
cb5c2e63 | 1170 | goto out; |
ee258d79 PS |
1171 | } |
1172 | ||
1173 | /* | |
1174 | * At this point the request is passed to the network stack - we assume | |
1175 | * that any credits taken from the server structure on the client have | |
1176 | * been spent and we can't return them back. Once we receive responses | |
1177 | * we will collect credits granted by the server in the mid callbacks | |
1178 | * and add those credits to the server structure. | |
1179 | */ | |
e0bba0b8 | 1180 | |
cb5c2e63 RS |
1181 | /* |
1182 | * Compounding is never used during session establish. | |
1183 | */ | |
d7d7a66a | 1184 | spin_lock(&ses->ses_lock); |
dd3cd870 | 1185 | if ((ses->ses_status == SES_NEW) || (optype & CIFS_NEG_OP) || (optype & CIFS_SESS_OP)) { |
d7d7a66a | 1186 | spin_unlock(&ses->ses_lock); |
080dc5e5 | 1187 | |
cc391b69 | 1188 | cifs_server_lock(server); |
f486ef8e | 1189 | smb311_update_preauth_hash(ses, server, rqst[0].rq_iov, rqst[0].rq_nvec); |
cc391b69 | 1190 | cifs_server_unlock(server); |
080dc5e5 | 1191 | |
d7d7a66a | 1192 | spin_lock(&ses->ses_lock); |
05946d4b | 1193 | } |
d7d7a66a | 1194 | spin_unlock(&ses->ses_lock); |
e0bba0b8 | 1195 | |
cb5c2e63 | 1196 | for (i = 0; i < num_rqst; i++) { |
3190b59a | 1197 | rc = wait_for_response(server, midQ[i]); |
8a26f0f7 PS |
1198 | if (rc != 0) |
1199 | break; | |
1200 | } | |
1201 | if (rc != 0) { | |
1202 | for (; i < num_rqst; i++) { | |
e3d100ea | 1203 | cifs_server_dbg(FYI, "Cancelling wait for mid %llu cmd: %d\n", |
43de1db3 | 1204 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); |
3190b59a | 1205 | send_cancel(server, &rqst[i], midQ[i]); |
d7d7a66a | 1206 | spin_lock(&server->mid_lock); |
7b71843f | 1207 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; |
e0bba0b8 | 1208 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { |
8a26f0f7 | 1209 | midQ[i]->callback = cifs_cancelled_callback; |
8544f4aa | 1210 | cancelled_mid[i] = true; |
34f4deb7 | 1211 | credits[i].value = 0; |
e0bba0b8 | 1212 | } |
d7d7a66a | 1213 | spin_unlock(&server->mid_lock); |
e0bba0b8 | 1214 | } |
cb5c2e63 RS |
1215 | } |
1216 | ||
cb5c2e63 RS |
1217 | for (i = 0; i < num_rqst; i++) { |
1218 | if (rc < 0) | |
1219 | goto out; | |
e0bba0b8 | 1220 | |
3190b59a | 1221 | rc = cifs_sync_mid_result(midQ[i], server); |
e0bba0b8 | 1222 | if (rc != 0) { |
8544f4aa PS |
1223 | /* mark this mid as cancelled to not free it below */ |
1224 | cancelled_mid[i] = true; | |
1225 | goto out; | |
1be912dd | 1226 | } |
2b2bdfba | 1227 | |
e0bba0b8 RS |
1228 | if (!midQ[i]->resp_buf || |
1229 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
1230 | rc = -EIO; | |
1231 | cifs_dbg(FYI, "Bad MID state?\n"); | |
1232 | goto out; | |
1233 | } | |
a891f0f8 | 1234 | |
e0bba0b8 RS |
1235 | buf = (char *)midQ[i]->resp_buf; |
1236 | resp_iov[i].iov_base = buf; | |
1237 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
9789de8b | 1238 | HEADER_PREAMBLE_SIZE(server); |
e0bba0b8 RS |
1239 | |
1240 | if (midQ[i]->large_buf) | |
1241 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
1242 | else | |
1243 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
1244 | ||
3190b59a | 1245 | rc = server->ops->check_receive(midQ[i], server, |
e0bba0b8 | 1246 | flags & CIFS_LOG_ERROR); |
1da177e4 | 1247 | |
70f08f91 | 1248 | /* mark it so buf will not be freed by delete_mid */ |
392e1c5d | 1249 | if ((flags & CIFS_NO_RSP_BUF) == 0) |
e0bba0b8 | 1250 | midQ[i]->resp_buf = NULL; |
cb5c2e63 | 1251 | |
e0bba0b8 | 1252 | } |
cb5c2e63 RS |
1253 | |
1254 | /* | |
1255 | * Compounding is never used during session establish. | |
1256 | */ | |
d7d7a66a | 1257 | spin_lock(&ses->ses_lock); |
dd3cd870 | 1258 | if ((ses->ses_status == SES_NEW) || (optype & CIFS_NEG_OP) || (optype & CIFS_SESS_OP)) { |
cb5c2e63 RS |
1259 | struct kvec iov = { |
1260 | .iov_base = resp_iov[0].iov_base, | |
1261 | .iov_len = resp_iov[0].iov_len | |
1262 | }; | |
d7d7a66a | 1263 | spin_unlock(&ses->ses_lock); |
cc391b69 | 1264 | cifs_server_lock(server); |
f486ef8e | 1265 | smb311_update_preauth_hash(ses, server, &iov, 1); |
cc391b69 | 1266 | cifs_server_unlock(server); |
d7d7a66a | 1267 | spin_lock(&ses->ses_lock); |
cb5c2e63 | 1268 | } |
d7d7a66a | 1269 | spin_unlock(&ses->ses_lock); |
cb5c2e63 | 1270 | |
7ee1af76 | 1271 | out: |
4e34feb5 RS |
1272 | /* |
1273 | * This will dequeue all mids. After this it is important that the | |
1274 | * demultiplex_thread will not process any of these mids any futher. | |
1275 | * This is prevented above by using a noop callback that will not | |
1276 | * wake this thread except for the very last PDU. | |
1277 | */ | |
8544f4aa PS |
1278 | for (i = 0; i < num_rqst; i++) { |
1279 | if (!cancelled_mid[i]) | |
70f08f91 | 1280 | delete_mid(midQ[i]); |
8544f4aa | 1281 | } |
1da177e4 | 1282 | |
d6e04ae6 SF |
1283 | return rc; |
1284 | } | |
1da177e4 | 1285 | |
e0bba0b8 RS |
1286 | int |
1287 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
352d96f3 | 1288 | struct TCP_Server_Info *server, |
e0bba0b8 RS |
1289 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, |
1290 | struct kvec *resp_iov) | |
1291 | { | |
352d96f3 AA |
1292 | return compound_send_recv(xid, ses, server, flags, 1, |
1293 | rqst, resp_buf_type, resp_iov); | |
e0bba0b8 RS |
1294 | } |
1295 | ||
738f9de5 PS |
1296 | int |
1297 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
1298 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
1299 | const int flags, struct kvec *resp_iov) | |
1300 | { | |
1301 | struct smb_rqst rqst; | |
3cecf486 | 1302 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
1303 | int rc; |
1304 | ||
3cecf486 | 1305 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
1306 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
1307 | GFP_KERNEL); | |
117e3b7f SF |
1308 | if (!new_iov) { |
1309 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
1310 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 1311 | return -ENOMEM; |
117e3b7f | 1312 | } |
3cecf486 RS |
1313 | } else |
1314 | new_iov = s_iov; | |
738f9de5 PS |
1315 | |
1316 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
1317 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
1318 | ||
1319 | new_iov[0].iov_base = new_iov[1].iov_base; | |
1320 | new_iov[0].iov_len = 4; | |
1321 | new_iov[1].iov_base += 4; | |
1322 | new_iov[1].iov_len -= 4; | |
1323 | ||
1324 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
1325 | rqst.rq_iov = new_iov; | |
1326 | rqst.rq_nvec = n_vec + 1; | |
1327 | ||
352d96f3 AA |
1328 | rc = cifs_send_recv(xid, ses, ses->server, |
1329 | &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1330 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1331 | kfree(new_iov); | |
738f9de5 PS |
1332 | return rc; |
1333 | } | |
1334 | ||
1da177e4 | 1335 | int |
96daf2b0 | 1336 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1337 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
480b1cb9 | 1338 | int *pbytes_returned, const int flags) |
1da177e4 LT |
1339 | { |
1340 | int rc = 0; | |
1da177e4 | 1341 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1342 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1343 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1344 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1345 | struct cifs_credits credits = { .value = 1, .instance = 0 }; |
ac6ad7a8 | 1346 | struct TCP_Server_Info *server; |
1da177e4 LT |
1347 | |
1348 | if (ses == NULL) { | |
f96637be | 1349 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1350 | return -EIO; |
1351 | } | |
ac6ad7a8 | 1352 | server = ses->server; |
afe6f653 | 1353 | if (server == NULL) { |
f96637be | 1354 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1355 | return -EIO; |
1356 | } | |
1357 | ||
d7d7a66a | 1358 | spin_lock(&server->srv_lock); |
080dc5e5 | 1359 | if (server->tcpStatus == CifsExiting) { |
d7d7a66a | 1360 | spin_unlock(&server->srv_lock); |
31ca3bc3 | 1361 | return -ENOENT; |
080dc5e5 | 1362 | } |
d7d7a66a | 1363 | spin_unlock(&server->srv_lock); |
31ca3bc3 | 1364 | |
79a58d1f | 1365 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1366 | to the same server. We may make this configurable later or |
1367 | use ses->maxReq */ | |
1da177e4 | 1368 | |
fb2036d8 | 1369 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
a0a3036b JP |
1370 | cifs_server_dbg(VFS, "Invalid length, greater than maximum frame, %d\n", |
1371 | len); | |
6d9c6d54 VL |
1372 | return -EIO; |
1373 | } | |
1374 | ||
afe6f653 | 1375 | rc = wait_for_free_request(server, flags, &credits.instance); |
7ee1af76 JA |
1376 | if (rc) |
1377 | return rc; | |
1378 | ||
79a58d1f | 1379 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1380 | and avoid races inside tcp sendmsg code that could cause corruption |
1381 | of smb data */ | |
1382 | ||
cc391b69 | 1383 | cifs_server_lock(server); |
1da177e4 | 1384 | |
7ee1af76 JA |
1385 | rc = allocate_mid(ses, in_buf, &midQ); |
1386 | if (rc) { | |
cc391b69 | 1387 | cifs_server_unlock(server); |
7ee1af76 | 1388 | /* Update # of requests on wire to server */ |
afe6f653 | 1389 | add_credits(server, &credits, 0); |
7ee1af76 | 1390 | return rc; |
1da177e4 LT |
1391 | } |
1392 | ||
afe6f653 | 1393 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1394 | if (rc) { |
cc391b69 | 1395 | cifs_server_unlock(server); |
829049cb VL |
1396 | goto out; |
1397 | } | |
1da177e4 | 1398 | |
7c9421e1 | 1399 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1400 | |
afe6f653 RS |
1401 | cifs_in_send_inc(server); |
1402 | rc = smb_send(server, in_buf, len); | |
1403 | cifs_in_send_dec(server); | |
789e6661 | 1404 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1405 | |
1406 | if (rc < 0) | |
afe6f653 | 1407 | server->sequence_number -= 2; |
ad313cb8 | 1408 | |
cc391b69 | 1409 | cifs_server_unlock(server); |
7ee1af76 | 1410 | |
79a58d1f | 1411 | if (rc < 0) |
7ee1af76 JA |
1412 | goto out; |
1413 | ||
afe6f653 | 1414 | rc = wait_for_response(server, midQ); |
1be912dd | 1415 | if (rc != 0) { |
afe6f653 | 1416 | send_cancel(server, &rqst, midQ); |
d7d7a66a | 1417 | spin_lock(&server->mid_lock); |
7c9421e1 | 1418 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd | 1419 | /* no longer considered to be "in-flight" */ |
70f08f91 | 1420 | midQ->callback = release_mid; |
d7d7a66a | 1421 | spin_unlock(&server->mid_lock); |
afe6f653 | 1422 | add_credits(server, &credits, 0); |
1be912dd JL |
1423 | return rc; |
1424 | } | |
d7d7a66a | 1425 | spin_unlock(&server->mid_lock); |
1be912dd | 1426 | } |
1da177e4 | 1427 | |
afe6f653 | 1428 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1429 | if (rc != 0) { |
afe6f653 | 1430 | add_credits(server, &credits, 0); |
1da177e4 LT |
1431 | return rc; |
1432 | } | |
50c2f753 | 1433 | |
2c8f981d | 1434 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1435 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1436 | rc = -EIO; |
afe6f653 | 1437 | cifs_server_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1438 | goto out; |
1da177e4 | 1439 | } |
7ee1af76 | 1440 | |
d4e4854f | 1441 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1442 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1443 | rc = cifs_check_receive(midQ, server, 0); |
7ee1af76 | 1444 | out: |
70f08f91 | 1445 | delete_mid(midQ); |
afe6f653 | 1446 | add_credits(server, &credits, 0); |
1da177e4 | 1447 | |
7ee1af76 JA |
1448 | return rc; |
1449 | } | |
1da177e4 | 1450 | |
7ee1af76 JA |
1451 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1452 | blocking lock to return. */ | |
1453 | ||
1454 | static int | |
96daf2b0 | 1455 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1456 | struct smb_hdr *in_buf, |
1457 | struct smb_hdr *out_buf) | |
1458 | { | |
1459 | int bytes_returned; | |
96daf2b0 | 1460 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1461 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1462 | ||
1463 | /* We just modify the current in_buf to change | |
1464 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1465 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1466 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1467 | ||
1468 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1469 | pSMB->Timeout = 0; | |
88257360 | 1470 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1471 | |
1472 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1473 | &bytes_returned, 0); |
7ee1af76 JA |
1474 | } |
1475 | ||
1476 | int | |
96daf2b0 | 1477 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1478 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1479 | int *pbytes_returned) | |
1480 | { | |
1481 | int rc = 0; | |
1482 | int rstart = 0; | |
7ee1af76 | 1483 | struct mid_q_entry *midQ; |
96daf2b0 | 1484 | struct cifs_ses *ses; |
fb2036d8 PS |
1485 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1486 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1487 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1488 | unsigned int instance; |
afe6f653 | 1489 | struct TCP_Server_Info *server; |
7ee1af76 JA |
1490 | |
1491 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1492 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1493 | return -EIO; |
1494 | } | |
1495 | ses = tcon->ses; | |
afe6f653 | 1496 | server = ses->server; |
7ee1af76 | 1497 | |
afe6f653 | 1498 | if (server == NULL) { |
f96637be | 1499 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1500 | return -EIO; |
1501 | } | |
1502 | ||
d7d7a66a | 1503 | spin_lock(&server->srv_lock); |
080dc5e5 | 1504 | if (server->tcpStatus == CifsExiting) { |
d7d7a66a | 1505 | spin_unlock(&server->srv_lock); |
7ee1af76 | 1506 | return -ENOENT; |
080dc5e5 | 1507 | } |
d7d7a66a | 1508 | spin_unlock(&server->srv_lock); |
7ee1af76 | 1509 | |
79a58d1f | 1510 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1511 | to the same server. We may make this configurable later or |
1512 | use ses->maxReq */ | |
1513 | ||
fb2036d8 | 1514 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
a0a3036b JP |
1515 | cifs_tcon_dbg(VFS, "Invalid length, greater than maximum frame, %d\n", |
1516 | len); | |
6d9c6d54 VL |
1517 | return -EIO; |
1518 | } | |
1519 | ||
afe6f653 | 1520 | rc = wait_for_free_request(server, CIFS_BLOCKING_OP, &instance); |
7ee1af76 JA |
1521 | if (rc) |
1522 | return rc; | |
1523 | ||
79a58d1f | 1524 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1525 | and avoid races inside tcp sendmsg code that could cause corruption |
1526 | of smb data */ | |
1527 | ||
cc391b69 | 1528 | cifs_server_lock(server); |
7ee1af76 JA |
1529 | |
1530 | rc = allocate_mid(ses, in_buf, &midQ); | |
1531 | if (rc) { | |
cc391b69 | 1532 | cifs_server_unlock(server); |
7ee1af76 JA |
1533 | return rc; |
1534 | } | |
1535 | ||
afe6f653 | 1536 | rc = cifs_sign_smb(in_buf, server, &midQ->sequence_number); |
829049cb | 1537 | if (rc) { |
70f08f91 | 1538 | delete_mid(midQ); |
cc391b69 | 1539 | cifs_server_unlock(server); |
829049cb VL |
1540 | return rc; |
1541 | } | |
1da177e4 | 1542 | |
7c9421e1 | 1543 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
afe6f653 RS |
1544 | cifs_in_send_inc(server); |
1545 | rc = smb_send(server, in_buf, len); | |
1546 | cifs_in_send_dec(server); | |
789e6661 | 1547 | cifs_save_when_sent(midQ); |
ad313cb8 JL |
1548 | |
1549 | if (rc < 0) | |
afe6f653 | 1550 | server->sequence_number -= 2; |
ad313cb8 | 1551 | |
cc391b69 | 1552 | cifs_server_unlock(server); |
7ee1af76 | 1553 | |
79a58d1f | 1554 | if (rc < 0) { |
70f08f91 | 1555 | delete_mid(midQ); |
7ee1af76 JA |
1556 | return rc; |
1557 | } | |
1558 | ||
1559 | /* Wait for a reply - allow signals to interrupt. */ | |
afe6f653 | 1560 | rc = wait_event_interruptible(server->response_q, |
7c9421e1 | 1561 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
afe6f653 RS |
1562 | ((server->tcpStatus != CifsGood) && |
1563 | (server->tcpStatus != CifsNew))); | |
7ee1af76 JA |
1564 | |
1565 | /* Were we interrupted by a signal ? */ | |
d7d7a66a | 1566 | spin_lock(&server->srv_lock); |
7ee1af76 | 1567 | if ((rc == -ERESTARTSYS) && |
7c9421e1 | 1568 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
afe6f653 RS |
1569 | ((server->tcpStatus == CifsGood) || |
1570 | (server->tcpStatus == CifsNew))) { | |
d7d7a66a | 1571 | spin_unlock(&server->srv_lock); |
7ee1af76 JA |
1572 | |
1573 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1574 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1575 | blocking lock to return. */ | |
afe6f653 | 1576 | rc = send_cancel(server, &rqst, midQ); |
7ee1af76 | 1577 | if (rc) { |
70f08f91 | 1578 | delete_mid(midQ); |
7ee1af76 JA |
1579 | return rc; |
1580 | } | |
1581 | } else { | |
1582 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1583 | to cause the blocking lock to return. */ | |
1584 | ||
1585 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1586 | ||
1587 | /* If we get -ENOLCK back the lock may have | |
1588 | already been removed. Don't exit in this case. */ | |
1589 | if (rc && rc != -ENOLCK) { | |
70f08f91 | 1590 | delete_mid(midQ); |
7ee1af76 JA |
1591 | return rc; |
1592 | } | |
1593 | } | |
1594 | ||
afe6f653 | 1595 | rc = wait_for_response(server, midQ); |
1be912dd | 1596 | if (rc) { |
afe6f653 | 1597 | send_cancel(server, &rqst, midQ); |
d7d7a66a | 1598 | spin_lock(&server->mid_lock); |
7c9421e1 | 1599 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd | 1600 | /* no longer considered to be "in-flight" */ |
70f08f91 | 1601 | midQ->callback = release_mid; |
d7d7a66a | 1602 | spin_unlock(&server->mid_lock); |
1be912dd JL |
1603 | return rc; |
1604 | } | |
d7d7a66a | 1605 | spin_unlock(&server->mid_lock); |
7ee1af76 | 1606 | } |
1be912dd JL |
1607 | |
1608 | /* We got the response - restart system call. */ | |
1609 | rstart = 1; | |
d7d7a66a | 1610 | spin_lock(&server->srv_lock); |
7ee1af76 | 1611 | } |
d7d7a66a | 1612 | spin_unlock(&server->srv_lock); |
7ee1af76 | 1613 | |
afe6f653 | 1614 | rc = cifs_sync_mid_result(midQ, server); |
053d5034 | 1615 | if (rc != 0) |
7ee1af76 | 1616 | return rc; |
50c2f753 | 1617 | |
17c8bfed | 1618 | /* rcvd frame is ok */ |
7c9421e1 | 1619 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1620 | rc = -EIO; |
3175eb9b | 1621 | cifs_tcon_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1622 | goto out; |
1623 | } | |
1da177e4 | 1624 | |
d4e4854f | 1625 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d | 1626 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
afe6f653 | 1627 | rc = cifs_check_receive(midQ, server, 0); |
17c8bfed | 1628 | out: |
70f08f91 | 1629 | delete_mid(midQ); |
7ee1af76 JA |
1630 | if (rstart && rc == -EACCES) |
1631 | return -ERESTARTSYS; | |
1da177e4 LT |
1632 | return rc; |
1633 | } | |
fb157ed2 SF |
1634 | |
1635 | /* | |
1636 | * Discard any remaining data in the current SMB. To do this, we borrow the | |
1637 | * current bigbuf. | |
1638 | */ | |
1639 | int | |
1640 | cifs_discard_remaining_data(struct TCP_Server_Info *server) | |
1641 | { | |
1642 | unsigned int rfclen = server->pdu_size; | |
9789de8b | 1643 | int remaining = rfclen + HEADER_PREAMBLE_SIZE(server) - |
fb157ed2 SF |
1644 | server->total_read; |
1645 | ||
1646 | while (remaining > 0) { | |
1647 | int length; | |
1648 | ||
1649 | length = cifs_discard_from_socket(server, | |
1650 | min_t(size_t, remaining, | |
1651 | CIFSMaxBufSize + MAX_HEADER_SIZE(server))); | |
1652 | if (length < 0) | |
1653 | return length; | |
1654 | server->total_read += length; | |
1655 | remaining -= length; | |
1656 | } | |
1657 | ||
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | static int | |
1662 | __cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid, | |
1663 | bool malformed) | |
1664 | { | |
1665 | int length; | |
1666 | ||
1667 | length = cifs_discard_remaining_data(server); | |
1668 | dequeue_mid(mid, malformed); | |
1669 | mid->resp_buf = server->smallbuf; | |
1670 | server->smallbuf = NULL; | |
1671 | return length; | |
1672 | } | |
1673 | ||
1674 | static int | |
1675 | cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid) | |
1676 | { | |
1677 | struct cifs_readdata *rdata = mid->callback_data; | |
1678 | ||
1679 | return __cifs_readv_discard(server, mid, rdata->result); | |
1680 | } | |
1681 | ||
1682 | int | |
1683 | cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid) | |
1684 | { | |
1685 | int length, len; | |
1686 | unsigned int data_offset, data_len; | |
1687 | struct cifs_readdata *rdata = mid->callback_data; | |
1688 | char *buf = server->smallbuf; | |
9789de8b | 1689 | unsigned int buflen = server->pdu_size + HEADER_PREAMBLE_SIZE(server); |
fb157ed2 SF |
1690 | bool use_rdma_mr = false; |
1691 | ||
1692 | cifs_dbg(FYI, "%s: mid=%llu offset=%llu bytes=%u\n", | |
1693 | __func__, mid->mid, rdata->offset, rdata->bytes); | |
1694 | ||
1695 | /* | |
1696 | * read the rest of READ_RSP header (sans Data array), or whatever we | |
1697 | * can if there's not enough data. At this point, we've read down to | |
1698 | * the Mid. | |
1699 | */ | |
1700 | len = min_t(unsigned int, buflen, server->vals->read_rsp_size) - | |
1701 | HEADER_SIZE(server) + 1; | |
1702 | ||
1703 | length = cifs_read_from_socket(server, | |
1704 | buf + HEADER_SIZE(server) - 1, len); | |
1705 | if (length < 0) | |
1706 | return length; | |
1707 | server->total_read += length; | |
1708 | ||
1709 | if (server->ops->is_session_expired && | |
1710 | server->ops->is_session_expired(buf)) { | |
1711 | cifs_reconnect(server, true); | |
1712 | return -1; | |
1713 | } | |
1714 | ||
1715 | if (server->ops->is_status_pending && | |
1716 | server->ops->is_status_pending(buf, server)) { | |
1717 | cifs_discard_remaining_data(server); | |
1718 | return -1; | |
1719 | } | |
1720 | ||
1721 | /* set up first two iov for signature check and to get credits */ | |
1722 | rdata->iov[0].iov_base = buf; | |
9789de8b ZX |
1723 | rdata->iov[0].iov_len = HEADER_PREAMBLE_SIZE(server); |
1724 | rdata->iov[1].iov_base = buf + HEADER_PREAMBLE_SIZE(server); | |
fb157ed2 | 1725 | rdata->iov[1].iov_len = |
9789de8b | 1726 | server->total_read - HEADER_PREAMBLE_SIZE(server); |
fb157ed2 SF |
1727 | cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n", |
1728 | rdata->iov[0].iov_base, rdata->iov[0].iov_len); | |
1729 | cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n", | |
1730 | rdata->iov[1].iov_base, rdata->iov[1].iov_len); | |
1731 | ||
1732 | /* Was the SMB read successful? */ | |
1733 | rdata->result = server->ops->map_error(buf, false); | |
1734 | if (rdata->result != 0) { | |
1735 | cifs_dbg(FYI, "%s: server returned error %d\n", | |
1736 | __func__, rdata->result); | |
1737 | /* normal error on read response */ | |
1738 | return __cifs_readv_discard(server, mid, false); | |
1739 | } | |
1740 | ||
1741 | /* Is there enough to get to the rest of the READ_RSP header? */ | |
1742 | if (server->total_read < server->vals->read_rsp_size) { | |
1743 | cifs_dbg(FYI, "%s: server returned short header. got=%u expected=%zu\n", | |
1744 | __func__, server->total_read, | |
1745 | server->vals->read_rsp_size); | |
1746 | rdata->result = -EIO; | |
1747 | return cifs_readv_discard(server, mid); | |
1748 | } | |
1749 | ||
1750 | data_offset = server->ops->read_data_offset(buf) + | |
9789de8b | 1751 | HEADER_PREAMBLE_SIZE(server); |
fb157ed2 SF |
1752 | if (data_offset < server->total_read) { |
1753 | /* | |
1754 | * win2k8 sometimes sends an offset of 0 when the read | |
1755 | * is beyond the EOF. Treat it as if the data starts just after | |
1756 | * the header. | |
1757 | */ | |
1758 | cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n", | |
1759 | __func__, data_offset); | |
1760 | data_offset = server->total_read; | |
1761 | } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) { | |
1762 | /* data_offset is beyond the end of smallbuf */ | |
1763 | cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n", | |
1764 | __func__, data_offset); | |
1765 | rdata->result = -EIO; | |
1766 | return cifs_readv_discard(server, mid); | |
1767 | } | |
1768 | ||
1769 | cifs_dbg(FYI, "%s: total_read=%u data_offset=%u\n", | |
1770 | __func__, server->total_read, data_offset); | |
1771 | ||
1772 | len = data_offset - server->total_read; | |
1773 | if (len > 0) { | |
1774 | /* read any junk before data into the rest of smallbuf */ | |
1775 | length = cifs_read_from_socket(server, | |
1776 | buf + server->total_read, len); | |
1777 | if (length < 0) | |
1778 | return length; | |
1779 | server->total_read += length; | |
1780 | } | |
1781 | ||
1782 | /* how much data is in the response? */ | |
1783 | #ifdef CONFIG_CIFS_SMB_DIRECT | |
1784 | use_rdma_mr = rdata->mr; | |
1785 | #endif | |
1786 | data_len = server->ops->read_data_length(buf, use_rdma_mr); | |
1787 | if (!use_rdma_mr && (data_offset + data_len > buflen)) { | |
1788 | /* data_len is corrupt -- discard frame */ | |
1789 | rdata->result = -EIO; | |
1790 | return cifs_readv_discard(server, mid); | |
1791 | } | |
1792 | ||
1793 | length = rdata->read_into_pages(server, rdata, data_len); | |
1794 | if (length < 0) | |
1795 | return length; | |
1796 | ||
1797 | server->total_read += length; | |
1798 | ||
1799 | cifs_dbg(FYI, "total_read=%u buflen=%u remaining=%u\n", | |
1800 | server->total_read, buflen, data_len); | |
1801 | ||
1802 | /* discard anything left over */ | |
1803 | if (server->total_read < buflen) | |
1804 | return cifs_readv_discard(server, mid); | |
1805 | ||
1806 | dequeue_mid(mid, false); | |
1807 | mid->resp_buf = server->smallbuf; | |
1808 | server->smallbuf = NULL; | |
1809 | return length; | |
1810 | } |