Commit | Line | Data |
---|---|---|
08e0e7c8 DH |
1 | /* Maintain an RxRPC server socket to do AFS communications through |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
08e0e7c8 DH |
13 | #include <net/sock.h> |
14 | #include <net/af_rxrpc.h> | |
15 | #include <rxrpc/packet.h> | |
16 | #include "internal.h" | |
17 | #include "afs_cm.h" | |
18 | ||
8324f0bc | 19 | struct socket *afs_socket; /* my RxRPC socket */ |
08e0e7c8 | 20 | static struct workqueue_struct *afs_async_calls; |
00d3b7a4 | 21 | static atomic_t afs_outstanding_calls; |
08e0e7c8 | 22 | |
d001648e DH |
23 | static void afs_free_call(struct afs_call *); |
24 | static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long); | |
08e0e7c8 | 25 | static int afs_wait_for_call_to_complete(struct afs_call *); |
d001648e | 26 | static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long); |
08e0e7c8 | 27 | static int afs_dont_wait_for_call_to_complete(struct afs_call *); |
d001648e DH |
28 | static void afs_process_async_call(struct work_struct *); |
29 | static void afs_rx_new_call(struct sock *); | |
30 | static int afs_deliver_cm_op_id(struct afs_call *); | |
08e0e7c8 DH |
31 | |
32 | /* synchronous call management */ | |
33 | const struct afs_wait_mode afs_sync_call = { | |
d001648e | 34 | .notify_rx = afs_wake_up_call_waiter, |
08e0e7c8 DH |
35 | .wait = afs_wait_for_call_to_complete, |
36 | }; | |
37 | ||
38 | /* asynchronous call management */ | |
39 | const struct afs_wait_mode afs_async_call = { | |
d001648e | 40 | .notify_rx = afs_wake_up_async_call, |
08e0e7c8 DH |
41 | .wait = afs_dont_wait_for_call_to_complete, |
42 | }; | |
43 | ||
44 | /* asynchronous incoming call management */ | |
45 | static const struct afs_wait_mode afs_async_incoming_call = { | |
d001648e | 46 | .notify_rx = afs_wake_up_async_call, |
08e0e7c8 DH |
47 | }; |
48 | ||
49 | /* asynchronous incoming call initial processing */ | |
50 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 51 | .name = "CB.xxxx", |
08e0e7c8 DH |
52 | .deliver = afs_deliver_cm_op_id, |
53 | .abort_to_error = afs_abort_to_error, | |
54 | }; | |
55 | ||
56 | static void afs_collect_incoming_call(struct work_struct *); | |
57 | ||
08e0e7c8 DH |
58 | static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call); |
59 | ||
2f02f7ae DH |
60 | static int afs_wait_atomic_t(atomic_t *p) |
61 | { | |
62 | schedule(); | |
63 | return 0; | |
64 | } | |
65 | ||
08e0e7c8 DH |
66 | /* |
67 | * open an RxRPC socket and bind it to be a server for callback notifications | |
68 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
69 | */ | |
70 | int afs_open_socket(void) | |
71 | { | |
72 | struct sockaddr_rxrpc srx; | |
73 | struct socket *socket; | |
74 | int ret; | |
75 | ||
76 | _enter(""); | |
77 | ||
0e119b41 | 78 | ret = -ENOMEM; |
69ad052a | 79 | afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0); |
0e119b41 DH |
80 | if (!afs_async_calls) |
81 | goto error_0; | |
08e0e7c8 | 82 | |
eeb1bd5c | 83 | ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); |
0e119b41 DH |
84 | if (ret < 0) |
85 | goto error_1; | |
08e0e7c8 DH |
86 | |
87 | socket->sk->sk_allocation = GFP_NOFS; | |
88 | ||
89 | /* bind the callback manager's address to make this a server socket */ | |
90 | srx.srx_family = AF_RXRPC; | |
91 | srx.srx_service = CM_SERVICE; | |
92 | srx.transport_type = SOCK_DGRAM; | |
93 | srx.transport_len = sizeof(srx.transport.sin); | |
94 | srx.transport.sin.sin_family = AF_INET; | |
95 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
96 | memset(&srx.transport.sin.sin_addr, 0, | |
97 | sizeof(srx.transport.sin.sin_addr)); | |
98 | ||
99 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
0e119b41 DH |
100 | if (ret < 0) |
101 | goto error_2; | |
102 | ||
d001648e DH |
103 | rxrpc_kernel_new_call_notification(socket, afs_rx_new_call); |
104 | ||
0e119b41 DH |
105 | ret = kernel_listen(socket, INT_MAX); |
106 | if (ret < 0) | |
107 | goto error_2; | |
08e0e7c8 | 108 | |
08e0e7c8 DH |
109 | afs_socket = socket; |
110 | _leave(" = 0"); | |
111 | return 0; | |
0e119b41 DH |
112 | |
113 | error_2: | |
114 | sock_release(socket); | |
115 | error_1: | |
116 | destroy_workqueue(afs_async_calls); | |
117 | error_0: | |
118 | _leave(" = %d", ret); | |
119 | return ret; | |
08e0e7c8 DH |
120 | } |
121 | ||
122 | /* | |
123 | * close the RxRPC socket AFS was using | |
124 | */ | |
125 | void afs_close_socket(void) | |
126 | { | |
127 | _enter(""); | |
128 | ||
d001648e | 129 | _debug("outstanding %u", atomic_read(&afs_outstanding_calls)); |
2f02f7ae DH |
130 | wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t, |
131 | TASK_UNINTERRUPTIBLE); | |
132 | _debug("no outstanding calls"); | |
133 | ||
d001648e | 134 | flush_workqueue(afs_async_calls); |
08e0e7c8 DH |
135 | sock_release(afs_socket); |
136 | ||
137 | _debug("dework"); | |
138 | destroy_workqueue(afs_async_calls); | |
139 | _leave(""); | |
140 | } | |
141 | ||
00d3b7a4 DH |
142 | /* |
143 | * free a call | |
144 | */ | |
145 | static void afs_free_call(struct afs_call *call) | |
146 | { | |
147 | _debug("DONE %p{%s} [%d]", | |
148 | call, call->type->name, atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 DH |
149 | |
150 | ASSERTCMP(call->rxcall, ==, NULL); | |
151 | ASSERT(!work_pending(&call->async_work)); | |
00d3b7a4 DH |
152 | ASSERT(call->type->name != NULL); |
153 | ||
154 | kfree(call->request); | |
155 | kfree(call); | |
2f02f7ae DH |
156 | |
157 | if (atomic_dec_and_test(&afs_outstanding_calls)) | |
158 | wake_up_atomic_t(&afs_outstanding_calls); | |
00d3b7a4 DH |
159 | } |
160 | ||
6c67c7c3 | 161 | /* |
6cf12869 | 162 | * End a call but do not free it |
6c67c7c3 | 163 | */ |
6cf12869 | 164 | static void afs_end_call_nofree(struct afs_call *call) |
6c67c7c3 DH |
165 | { |
166 | if (call->rxcall) { | |
4de48af6 | 167 | rxrpc_kernel_end_call(afs_socket, call->rxcall); |
6c67c7c3 DH |
168 | call->rxcall = NULL; |
169 | } | |
6cf12869 NWF |
170 | if (call->type->destructor) |
171 | call->type->destructor(call); | |
172 | } | |
173 | ||
174 | /* | |
175 | * End a call and free it | |
176 | */ | |
177 | static void afs_end_call(struct afs_call *call) | |
178 | { | |
179 | afs_end_call_nofree(call); | |
6c67c7c3 DH |
180 | afs_free_call(call); |
181 | } | |
182 | ||
08e0e7c8 DH |
183 | /* |
184 | * allocate a call with flat request and reply buffers | |
185 | */ | |
186 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
d001648e | 187 | size_t request_size, size_t reply_max) |
08e0e7c8 DH |
188 | { |
189 | struct afs_call *call; | |
190 | ||
191 | call = kzalloc(sizeof(*call), GFP_NOFS); | |
192 | if (!call) | |
193 | goto nomem_call; | |
194 | ||
00d3b7a4 DH |
195 | _debug("CALL %p{%s} [%d]", |
196 | call, type->name, atomic_read(&afs_outstanding_calls)); | |
197 | atomic_inc(&afs_outstanding_calls); | |
198 | ||
199 | call->type = type; | |
200 | call->request_size = request_size; | |
d001648e | 201 | call->reply_max = reply_max; |
00d3b7a4 | 202 | |
08e0e7c8 DH |
203 | if (request_size) { |
204 | call->request = kmalloc(request_size, GFP_NOFS); | |
205 | if (!call->request) | |
00d3b7a4 | 206 | goto nomem_free; |
08e0e7c8 DH |
207 | } |
208 | ||
d001648e DH |
209 | if (reply_max) { |
210 | call->buffer = kmalloc(reply_max, GFP_NOFS); | |
08e0e7c8 | 211 | if (!call->buffer) |
00d3b7a4 | 212 | goto nomem_free; |
08e0e7c8 DH |
213 | } |
214 | ||
08e0e7c8 | 215 | init_waitqueue_head(&call->waitq); |
08e0e7c8 DH |
216 | return call; |
217 | ||
00d3b7a4 DH |
218 | nomem_free: |
219 | afs_free_call(call); | |
08e0e7c8 DH |
220 | nomem_call: |
221 | return NULL; | |
222 | } | |
223 | ||
224 | /* | |
225 | * clean up a call with flat buffer | |
226 | */ | |
227 | void afs_flat_call_destructor(struct afs_call *call) | |
228 | { | |
229 | _enter(""); | |
230 | ||
231 | kfree(call->request); | |
232 | call->request = NULL; | |
233 | kfree(call->buffer); | |
234 | call->buffer = NULL; | |
235 | } | |
236 | ||
31143d5d DH |
237 | /* |
238 | * attach the data from a bunch of pages on an inode to a call | |
239 | */ | |
c1206a2c AB |
240 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg, |
241 | struct kvec *iov) | |
31143d5d DH |
242 | { |
243 | struct page *pages[8]; | |
244 | unsigned count, n, loop, offset, to; | |
245 | pgoff_t first = call->first, last = call->last; | |
246 | int ret; | |
247 | ||
248 | _enter(""); | |
249 | ||
250 | offset = call->first_offset; | |
251 | call->first_offset = 0; | |
252 | ||
253 | do { | |
254 | _debug("attach %lx-%lx", first, last); | |
255 | ||
256 | count = last - first + 1; | |
257 | if (count > ARRAY_SIZE(pages)) | |
258 | count = ARRAY_SIZE(pages); | |
259 | n = find_get_pages_contig(call->mapping, first, count, pages); | |
260 | ASSERTCMP(n, ==, count); | |
261 | ||
262 | loop = 0; | |
263 | do { | |
264 | msg->msg_flags = 0; | |
265 | to = PAGE_SIZE; | |
266 | if (first + loop >= last) | |
267 | to = call->last_to; | |
268 | else | |
269 | msg->msg_flags = MSG_MORE; | |
270 | iov->iov_base = kmap(pages[loop]) + offset; | |
271 | iov->iov_len = to - offset; | |
272 | offset = 0; | |
273 | ||
274 | _debug("- range %u-%u%s", | |
275 | offset, to, msg->msg_flags ? " [more]" : ""); | |
2e90b1c4 AV |
276 | iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, |
277 | iov, 1, to - offset); | |
31143d5d DH |
278 | |
279 | /* have to change the state *before* sending the last | |
280 | * packet as RxRPC might give us the reply before it | |
281 | * returns from sending the request */ | |
282 | if (first + loop >= last) | |
283 | call->state = AFS_CALL_AWAIT_REPLY; | |
4de48af6 DH |
284 | ret = rxrpc_kernel_send_data(afs_socket, call->rxcall, |
285 | msg, to - offset); | |
31143d5d DH |
286 | kunmap(pages[loop]); |
287 | if (ret < 0) | |
288 | break; | |
289 | } while (++loop < count); | |
290 | first += count; | |
291 | ||
292 | for (loop = 0; loop < count; loop++) | |
293 | put_page(pages[loop]); | |
294 | if (ret < 0) | |
295 | break; | |
5bbf5d39 | 296 | } while (first <= last); |
31143d5d DH |
297 | |
298 | _leave(" = %d", ret); | |
299 | return ret; | |
300 | } | |
301 | ||
08e0e7c8 DH |
302 | /* |
303 | * initiate a call | |
304 | */ | |
305 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
306 | const struct afs_wait_mode *wait_mode) | |
307 | { | |
308 | struct sockaddr_rxrpc srx; | |
309 | struct rxrpc_call *rxcall; | |
310 | struct msghdr msg; | |
311 | struct kvec iov[1]; | |
312 | int ret; | |
313 | ||
314 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
315 | ||
00d3b7a4 DH |
316 | ASSERT(call->type != NULL); |
317 | ASSERT(call->type->name != NULL); | |
318 | ||
31143d5d DH |
319 | _debug("____MAKE %p{%s,%x} [%d]____", |
320 | call, call->type->name, key_serial(call->key), | |
321 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 322 | |
08e0e7c8 | 323 | call->wait_mode = wait_mode; |
d001648e | 324 | INIT_WORK(&call->async_work, afs_process_async_call); |
08e0e7c8 DH |
325 | |
326 | memset(&srx, 0, sizeof(srx)); | |
327 | srx.srx_family = AF_RXRPC; | |
328 | srx.srx_service = call->service_id; | |
329 | srx.transport_type = SOCK_DGRAM; | |
330 | srx.transport_len = sizeof(srx.transport.sin); | |
331 | srx.transport.sin.sin_family = AF_INET; | |
332 | srx.transport.sin.sin_port = call->port; | |
333 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
334 | ||
335 | /* create a call */ | |
336 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
d001648e DH |
337 | (unsigned long) call, gfp, |
338 | wait_mode->notify_rx); | |
00d3b7a4 | 339 | call->key = NULL; |
08e0e7c8 DH |
340 | if (IS_ERR(rxcall)) { |
341 | ret = PTR_ERR(rxcall); | |
342 | goto error_kill_call; | |
343 | } | |
344 | ||
345 | call->rxcall = rxcall; | |
346 | ||
347 | /* send the request */ | |
348 | iov[0].iov_base = call->request; | |
349 | iov[0].iov_len = call->request_size; | |
350 | ||
351 | msg.msg_name = NULL; | |
352 | msg.msg_namelen = 0; | |
2e90b1c4 | 353 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 354 | call->request_size); |
08e0e7c8 DH |
355 | msg.msg_control = NULL; |
356 | msg.msg_controllen = 0; | |
31143d5d | 357 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 DH |
358 | |
359 | /* have to change the state *before* sending the last packet as RxRPC | |
360 | * might give us the reply before it returns from sending the | |
361 | * request */ | |
31143d5d DH |
362 | if (!call->send_pages) |
363 | call->state = AFS_CALL_AWAIT_REPLY; | |
4de48af6 DH |
364 | ret = rxrpc_kernel_send_data(afs_socket, rxcall, |
365 | &msg, call->request_size); | |
08e0e7c8 DH |
366 | if (ret < 0) |
367 | goto error_do_abort; | |
368 | ||
31143d5d DH |
369 | if (call->send_pages) { |
370 | ret = afs_send_pages(call, &msg, iov); | |
371 | if (ret < 0) | |
372 | goto error_do_abort; | |
373 | } | |
374 | ||
08e0e7c8 DH |
375 | /* at this point, an async call may no longer exist as it may have |
376 | * already completed */ | |
377 | return wait_mode->wait(call); | |
378 | ||
379 | error_do_abort: | |
5a42976d | 380 | rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, -ret, "KSD"); |
08e0e7c8 | 381 | error_kill_call: |
6c67c7c3 | 382 | afs_end_call(call); |
08e0e7c8 DH |
383 | _leave(" = %d", ret); |
384 | return ret; | |
385 | } | |
386 | ||
08e0e7c8 DH |
387 | /* |
388 | * deliver messages to a call | |
389 | */ | |
390 | static void afs_deliver_to_call(struct afs_call *call) | |
391 | { | |
08e0e7c8 DH |
392 | u32 abort_code; |
393 | int ret; | |
394 | ||
d001648e DH |
395 | _enter("%s", call->type->name); |
396 | ||
397 | while (call->state == AFS_CALL_AWAIT_REPLY || | |
398 | call->state == AFS_CALL_AWAIT_OP_ID || | |
399 | call->state == AFS_CALL_AWAIT_REQUEST || | |
400 | call->state == AFS_CALL_AWAIT_ACK | |
401 | ) { | |
402 | if (call->state == AFS_CALL_AWAIT_ACK) { | |
403 | size_t offset = 0; | |
404 | ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, | |
405 | NULL, 0, &offset, false, | |
406 | &call->abort_code); | |
407 | if (ret == -EINPROGRESS || ret == -EAGAIN) | |
408 | return; | |
409 | if (ret == 1) { | |
410 | call->state = AFS_CALL_COMPLETE; | |
411 | goto done; | |
08e0e7c8 | 412 | } |
d001648e | 413 | return; |
08e0e7c8 DH |
414 | } |
415 | ||
d001648e DH |
416 | ret = call->type->deliver(call); |
417 | switch (ret) { | |
418 | case 0: | |
419 | if (call->state == AFS_CALL_AWAIT_REPLY) | |
420 | call->state = AFS_CALL_COMPLETE; | |
421 | goto done; | |
422 | case -EINPROGRESS: | |
423 | case -EAGAIN: | |
424 | goto out; | |
425 | case -ENOTCONN: | |
426 | abort_code = RX_CALL_DEAD; | |
427 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
5a42976d | 428 | abort_code, -ret, "KNC"); |
d001648e DH |
429 | goto do_abort; |
430 | case -ENOTSUPP: | |
431 | abort_code = RX_INVALID_OPERATION; | |
432 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
5a42976d | 433 | abort_code, -ret, "KIV"); |
d001648e DH |
434 | goto do_abort; |
435 | case -ENODATA: | |
436 | case -EBADMSG: | |
437 | case -EMSGSIZE: | |
438 | default: | |
439 | abort_code = RXGEN_CC_UNMARSHAL; | |
440 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
441 | abort_code = RXGEN_SS_UNMARSHAL; | |
442 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
5a42976d | 443 | abort_code, EBADMSG, "KUM"); |
d001648e DH |
444 | goto do_abort; |
445 | } | |
08e0e7c8 DH |
446 | } |
447 | ||
d001648e DH |
448 | done: |
449 | if (call->state == AFS_CALL_COMPLETE && call->incoming) | |
450 | afs_end_call(call); | |
451 | out: | |
08e0e7c8 | 452 | _leave(""); |
d001648e DH |
453 | return; |
454 | ||
455 | do_abort: | |
456 | call->error = ret; | |
457 | call->state = AFS_CALL_COMPLETE; | |
458 | goto done; | |
08e0e7c8 DH |
459 | } |
460 | ||
461 | /* | |
462 | * wait synchronously for a call to complete | |
463 | */ | |
464 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
465 | { | |
5a42976d | 466 | const char *abort_why; |
08e0e7c8 DH |
467 | int ret; |
468 | ||
469 | DECLARE_WAITQUEUE(myself, current); | |
470 | ||
471 | _enter(""); | |
472 | ||
473 | add_wait_queue(&call->waitq, &myself); | |
474 | for (;;) { | |
475 | set_current_state(TASK_INTERRUPTIBLE); | |
476 | ||
477 | /* deliver any messages that are in the queue */ | |
d001648e DH |
478 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
479 | call->need_attention = false; | |
08e0e7c8 DH |
480 | __set_current_state(TASK_RUNNING); |
481 | afs_deliver_to_call(call); | |
482 | continue; | |
483 | } | |
484 | ||
5a42976d | 485 | abort_why = "KWC"; |
08e0e7c8 | 486 | ret = call->error; |
d001648e | 487 | if (call->state == AFS_CALL_COMPLETE) |
08e0e7c8 | 488 | break; |
5a42976d | 489 | abort_why = "KWI"; |
08e0e7c8 DH |
490 | ret = -EINTR; |
491 | if (signal_pending(current)) | |
492 | break; | |
493 | schedule(); | |
494 | } | |
495 | ||
496 | remove_wait_queue(&call->waitq, &myself); | |
497 | __set_current_state(TASK_RUNNING); | |
498 | ||
499 | /* kill the call */ | |
500 | if (call->state < AFS_CALL_COMPLETE) { | |
501 | _debug("call incomplete"); | |
d001648e | 502 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
5a42976d | 503 | RX_CALL_DEAD, -ret, abort_why); |
08e0e7c8 DH |
504 | } |
505 | ||
506 | _debug("call complete"); | |
6c67c7c3 | 507 | afs_end_call(call); |
08e0e7c8 DH |
508 | _leave(" = %d", ret); |
509 | return ret; | |
510 | } | |
511 | ||
512 | /* | |
513 | * wake up a waiting call | |
514 | */ | |
d001648e DH |
515 | static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, |
516 | unsigned long call_user_ID) | |
08e0e7c8 | 517 | { |
d001648e DH |
518 | struct afs_call *call = (struct afs_call *)call_user_ID; |
519 | ||
520 | call->need_attention = true; | |
08e0e7c8 DH |
521 | wake_up(&call->waitq); |
522 | } | |
523 | ||
524 | /* | |
525 | * wake up an asynchronous call | |
526 | */ | |
d001648e DH |
527 | static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, |
528 | unsigned long call_user_ID) | |
08e0e7c8 | 529 | { |
d001648e DH |
530 | struct afs_call *call = (struct afs_call *)call_user_ID; |
531 | ||
532 | call->need_attention = true; | |
08e0e7c8 DH |
533 | queue_work(afs_async_calls, &call->async_work); |
534 | } | |
535 | ||
536 | /* | |
537 | * put a call into asynchronous mode | |
538 | * - mustn't touch the call descriptor as the call my have completed by the | |
539 | * time we get here | |
540 | */ | |
541 | static int afs_dont_wait_for_call_to_complete(struct afs_call *call) | |
542 | { | |
543 | _enter(""); | |
544 | return -EINPROGRESS; | |
545 | } | |
546 | ||
547 | /* | |
548 | * delete an asynchronous call | |
549 | */ | |
d001648e | 550 | static void afs_delete_async_call(struct work_struct *work) |
08e0e7c8 | 551 | { |
d001648e DH |
552 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
553 | ||
08e0e7c8 DH |
554 | _enter(""); |
555 | ||
00d3b7a4 | 556 | afs_free_call(call); |
08e0e7c8 DH |
557 | |
558 | _leave(""); | |
559 | } | |
560 | ||
561 | /* | |
562 | * perform processing on an asynchronous call | |
08e0e7c8 | 563 | */ |
d001648e | 564 | static void afs_process_async_call(struct work_struct *work) |
08e0e7c8 | 565 | { |
d001648e DH |
566 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
567 | ||
08e0e7c8 DH |
568 | _enter(""); |
569 | ||
d001648e DH |
570 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
571 | call->need_attention = false; | |
08e0e7c8 | 572 | afs_deliver_to_call(call); |
d001648e | 573 | } |
08e0e7c8 | 574 | |
d001648e | 575 | if (call->state == AFS_CALL_COMPLETE && call->wait_mode) { |
08e0e7c8 DH |
576 | if (call->wait_mode->async_complete) |
577 | call->wait_mode->async_complete(call->reply, | |
578 | call->error); | |
579 | call->reply = NULL; | |
580 | ||
581 | /* kill the call */ | |
6cf12869 | 582 | afs_end_call_nofree(call); |
08e0e7c8 DH |
583 | |
584 | /* we can't just delete the call because the work item may be | |
585 | * queued */ | |
d001648e | 586 | call->async_work.func = afs_delete_async_call; |
08e0e7c8 DH |
587 | queue_work(afs_async_calls, &call->async_work); |
588 | } | |
589 | ||
590 | _leave(""); | |
591 | } | |
592 | ||
08e0e7c8 DH |
593 | /* |
594 | * accept the backlog of incoming calls | |
595 | */ | |
596 | static void afs_collect_incoming_call(struct work_struct *work) | |
597 | { | |
598 | struct rxrpc_call *rxcall; | |
599 | struct afs_call *call = NULL; | |
08e0e7c8 | 600 | |
d001648e | 601 | _enter(""); |
08e0e7c8 | 602 | |
d001648e | 603 | do { |
08e0e7c8 DH |
604 | if (!call) { |
605 | call = kzalloc(sizeof(struct afs_call), GFP_KERNEL); | |
606 | if (!call) { | |
607 | rxrpc_kernel_reject_call(afs_socket); | |
608 | return; | |
609 | } | |
610 | ||
d001648e | 611 | INIT_WORK(&call->async_work, afs_process_async_call); |
08e0e7c8 DH |
612 | call->wait_mode = &afs_async_incoming_call; |
613 | call->type = &afs_RXCMxxxx; | |
614 | init_waitqueue_head(&call->waitq); | |
08e0e7c8 | 615 | call->state = AFS_CALL_AWAIT_OP_ID; |
00d3b7a4 DH |
616 | |
617 | _debug("CALL %p{%s} [%d]", | |
618 | call, call->type->name, | |
619 | atomic_read(&afs_outstanding_calls)); | |
620 | atomic_inc(&afs_outstanding_calls); | |
08e0e7c8 DH |
621 | } |
622 | ||
623 | rxcall = rxrpc_kernel_accept_call(afs_socket, | |
d001648e DH |
624 | (unsigned long)call, |
625 | afs_wake_up_async_call); | |
08e0e7c8 DH |
626 | if (!IS_ERR(rxcall)) { |
627 | call->rxcall = rxcall; | |
d001648e DH |
628 | call->need_attention = true; |
629 | queue_work(afs_async_calls, &call->async_work); | |
08e0e7c8 DH |
630 | call = NULL; |
631 | } | |
d001648e | 632 | } while (!call); |
08e0e7c8 | 633 | |
00d3b7a4 DH |
634 | if (call) |
635 | afs_free_call(call); | |
08e0e7c8 DH |
636 | } |
637 | ||
d001648e DH |
638 | /* |
639 | * Notification of an incoming call. | |
640 | */ | |
641 | static void afs_rx_new_call(struct sock *sk) | |
642 | { | |
643 | queue_work(afs_wq, &afs_collect_incoming_call_work); | |
644 | } | |
645 | ||
08e0e7c8 | 646 | /* |
372ee163 DH |
647 | * Grab the operation ID from an incoming cache manager call. The socket |
648 | * buffer is discarded on error or if we don't yet have sufficient data. | |
08e0e7c8 | 649 | */ |
d001648e | 650 | static int afs_deliver_cm_op_id(struct afs_call *call) |
08e0e7c8 | 651 | { |
d001648e | 652 | int ret; |
08e0e7c8 | 653 | |
d001648e | 654 | _enter("{%zu}", call->offset); |
08e0e7c8 DH |
655 | |
656 | ASSERTCMP(call->offset, <, 4); | |
657 | ||
658 | /* the operation ID forms the first four bytes of the request data */ | |
d001648e DH |
659 | ret = afs_extract_data(call, &call->operation_ID, 4, true); |
660 | if (ret < 0) | |
661 | return ret; | |
08e0e7c8 DH |
662 | |
663 | call->state = AFS_CALL_AWAIT_REQUEST; | |
d001648e | 664 | call->offset = 0; |
08e0e7c8 DH |
665 | |
666 | /* ask the cache manager to route the call (it'll change the call type | |
667 | * if successful) */ | |
668 | if (!afs_cm_incoming_call(call)) | |
669 | return -ENOTSUPP; | |
670 | ||
671 | /* pass responsibility for the remainer of this message off to the | |
672 | * cache manager op */ | |
d001648e | 673 | return call->type->deliver(call); |
08e0e7c8 DH |
674 | } |
675 | ||
676 | /* | |
677 | * send an empty reply | |
678 | */ | |
679 | void afs_send_empty_reply(struct afs_call *call) | |
680 | { | |
681 | struct msghdr msg; | |
08e0e7c8 DH |
682 | |
683 | _enter(""); | |
684 | ||
08e0e7c8 DH |
685 | msg.msg_name = NULL; |
686 | msg.msg_namelen = 0; | |
bfd4e956 | 687 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
688 | msg.msg_control = NULL; |
689 | msg.msg_controllen = 0; | |
690 | msg.msg_flags = 0; | |
691 | ||
692 | call->state = AFS_CALL_AWAIT_ACK; | |
4de48af6 | 693 | switch (rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, 0)) { |
08e0e7c8 DH |
694 | case 0: |
695 | _leave(" [replied]"); | |
696 | return; | |
697 | ||
698 | case -ENOMEM: | |
699 | _debug("oom"); | |
4de48af6 | 700 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
5a42976d | 701 | RX_USER_ABORT, ENOMEM, "KOO"); |
08e0e7c8 | 702 | default: |
6c67c7c3 | 703 | afs_end_call(call); |
08e0e7c8 DH |
704 | _leave(" [error]"); |
705 | return; | |
706 | } | |
707 | } | |
708 | ||
b908fe6b DH |
709 | /* |
710 | * send a simple reply | |
711 | */ | |
712 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
713 | { | |
714 | struct msghdr msg; | |
2e90b1c4 | 715 | struct kvec iov[1]; |
bd6dc742 | 716 | int n; |
b908fe6b DH |
717 | |
718 | _enter(""); | |
719 | ||
720 | iov[0].iov_base = (void *) buf; | |
721 | iov[0].iov_len = len; | |
722 | msg.msg_name = NULL; | |
723 | msg.msg_namelen = 0; | |
2e90b1c4 | 724 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
725 | msg.msg_control = NULL; |
726 | msg.msg_controllen = 0; | |
727 | msg.msg_flags = 0; | |
728 | ||
729 | call->state = AFS_CALL_AWAIT_ACK; | |
4de48af6 | 730 | n = rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, len); |
bd6dc742 | 731 | if (n >= 0) { |
6c67c7c3 | 732 | /* Success */ |
b908fe6b DH |
733 | _leave(" [replied]"); |
734 | return; | |
bd6dc742 | 735 | } |
6c67c7c3 | 736 | |
bd6dc742 | 737 | if (n == -ENOMEM) { |
b908fe6b | 738 | _debug("oom"); |
4de48af6 | 739 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
5a42976d | 740 | RX_USER_ABORT, ENOMEM, "KOO"); |
b908fe6b | 741 | } |
6c67c7c3 | 742 | afs_end_call(call); |
bd6dc742 | 743 | _leave(" [error]"); |
b908fe6b DH |
744 | } |
745 | ||
08e0e7c8 | 746 | /* |
372ee163 | 747 | * Extract a piece of data from the received data socket buffers. |
08e0e7c8 | 748 | */ |
d001648e DH |
749 | int afs_extract_data(struct afs_call *call, void *buf, size_t count, |
750 | bool want_more) | |
08e0e7c8 | 751 | { |
d001648e | 752 | int ret; |
08e0e7c8 | 753 | |
d001648e DH |
754 | _enter("{%s,%zu},,%zu,%d", |
755 | call->type->name, call->offset, count, want_more); | |
08e0e7c8 | 756 | |
d001648e | 757 | ASSERTCMP(call->offset, <=, count); |
08e0e7c8 | 758 | |
d001648e DH |
759 | ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, |
760 | buf, count, &call->offset, | |
761 | want_more, &call->abort_code); | |
762 | if (ret == 0 || ret == -EAGAIN) | |
763 | return ret; | |
08e0e7c8 | 764 | |
d001648e DH |
765 | if (ret == 1) { |
766 | switch (call->state) { | |
767 | case AFS_CALL_AWAIT_REPLY: | |
768 | call->state = AFS_CALL_COMPLETE; | |
769 | break; | |
770 | case AFS_CALL_AWAIT_REQUEST: | |
771 | call->state = AFS_CALL_REPLYING; | |
772 | break; | |
773 | default: | |
774 | break; | |
775 | } | |
776 | return 0; | |
08e0e7c8 | 777 | } |
d001648e DH |
778 | |
779 | if (ret == -ECONNABORTED) | |
780 | call->error = call->type->abort_to_error(call->abort_code); | |
781 | else | |
782 | call->error = ret; | |
783 | call->state = AFS_CALL_COMPLETE; | |
784 | return ret; | |
08e0e7c8 | 785 | } |