]>
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; |
00e90712 | 21 | static struct afs_call *afs_spare_incoming_call; |
341f741f | 22 | atomic_t afs_outstanding_calls; |
08e0e7c8 | 23 | |
d001648e | 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); |
d001648e | 27 | static void afs_process_async_call(struct work_struct *); |
00e90712 DH |
28 | static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long); |
29 | static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long); | |
d001648e | 30 | static int afs_deliver_cm_op_id(struct afs_call *); |
08e0e7c8 | 31 | |
08e0e7c8 DH |
32 | /* asynchronous incoming call initial processing */ |
33 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 34 | .name = "CB.xxxx", |
08e0e7c8 DH |
35 | .deliver = afs_deliver_cm_op_id, |
36 | .abort_to_error = afs_abort_to_error, | |
37 | }; | |
38 | ||
00e90712 | 39 | static void afs_charge_preallocation(struct work_struct *); |
08e0e7c8 | 40 | |
00e90712 | 41 | static DECLARE_WORK(afs_charge_preallocation_work, afs_charge_preallocation); |
08e0e7c8 | 42 | |
2f02f7ae DH |
43 | static int afs_wait_atomic_t(atomic_t *p) |
44 | { | |
45 | schedule(); | |
46 | return 0; | |
47 | } | |
48 | ||
08e0e7c8 DH |
49 | /* |
50 | * open an RxRPC socket and bind it to be a server for callback notifications | |
51 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
52 | */ | |
53 | int afs_open_socket(void) | |
54 | { | |
55 | struct sockaddr_rxrpc srx; | |
56 | struct socket *socket; | |
57 | int ret; | |
58 | ||
59 | _enter(""); | |
60 | ||
0e119b41 | 61 | ret = -ENOMEM; |
69ad052a | 62 | afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0); |
0e119b41 DH |
63 | if (!afs_async_calls) |
64 | goto error_0; | |
08e0e7c8 | 65 | |
eeb1bd5c | 66 | ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); |
0e119b41 DH |
67 | if (ret < 0) |
68 | goto error_1; | |
08e0e7c8 DH |
69 | |
70 | socket->sk->sk_allocation = GFP_NOFS; | |
71 | ||
72 | /* bind the callback manager's address to make this a server socket */ | |
73 | srx.srx_family = AF_RXRPC; | |
74 | srx.srx_service = CM_SERVICE; | |
75 | srx.transport_type = SOCK_DGRAM; | |
76 | srx.transport_len = sizeof(srx.transport.sin); | |
77 | srx.transport.sin.sin_family = AF_INET; | |
78 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
79 | memset(&srx.transport.sin.sin_addr, 0, | |
80 | sizeof(srx.transport.sin.sin_addr)); | |
81 | ||
82 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
0e119b41 DH |
83 | if (ret < 0) |
84 | goto error_2; | |
85 | ||
00e90712 DH |
86 | rxrpc_kernel_new_call_notification(socket, afs_rx_new_call, |
87 | afs_rx_discard_new_call); | |
d001648e | 88 | |
0e119b41 DH |
89 | ret = kernel_listen(socket, INT_MAX); |
90 | if (ret < 0) | |
91 | goto error_2; | |
08e0e7c8 | 92 | |
08e0e7c8 | 93 | afs_socket = socket; |
00e90712 | 94 | afs_charge_preallocation(NULL); |
08e0e7c8 DH |
95 | _leave(" = 0"); |
96 | return 0; | |
0e119b41 DH |
97 | |
98 | error_2: | |
99 | sock_release(socket); | |
100 | error_1: | |
101 | destroy_workqueue(afs_async_calls); | |
102 | error_0: | |
103 | _leave(" = %d", ret); | |
104 | return ret; | |
08e0e7c8 DH |
105 | } |
106 | ||
107 | /* | |
108 | * close the RxRPC socket AFS was using | |
109 | */ | |
110 | void afs_close_socket(void) | |
111 | { | |
112 | _enter(""); | |
113 | ||
341f741f DH |
114 | kernel_listen(afs_socket, 0); |
115 | flush_workqueue(afs_async_calls); | |
116 | ||
00e90712 | 117 | if (afs_spare_incoming_call) { |
341f741f | 118 | afs_put_call(afs_spare_incoming_call); |
00e90712 DH |
119 | afs_spare_incoming_call = NULL; |
120 | } | |
121 | ||
d001648e | 122 | _debug("outstanding %u", atomic_read(&afs_outstanding_calls)); |
2f02f7ae DH |
123 | wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t, |
124 | TASK_UNINTERRUPTIBLE); | |
125 | _debug("no outstanding calls"); | |
126 | ||
248f219c | 127 | kernel_sock_shutdown(afs_socket, SHUT_RDWR); |
d001648e | 128 | flush_workqueue(afs_async_calls); |
08e0e7c8 DH |
129 | sock_release(afs_socket); |
130 | ||
131 | _debug("dework"); | |
132 | destroy_workqueue(afs_async_calls); | |
133 | _leave(""); | |
134 | } | |
135 | ||
00d3b7a4 | 136 | /* |
341f741f | 137 | * Allocate a call. |
00d3b7a4 | 138 | */ |
341f741f DH |
139 | static struct afs_call *afs_alloc_call(const struct afs_call_type *type, |
140 | gfp_t gfp) | |
00d3b7a4 | 141 | { |
341f741f DH |
142 | struct afs_call *call; |
143 | int o; | |
00d3b7a4 | 144 | |
341f741f DH |
145 | call = kzalloc(sizeof(*call), gfp); |
146 | if (!call) | |
147 | return NULL; | |
00d3b7a4 | 148 | |
341f741f DH |
149 | call->type = type; |
150 | atomic_set(&call->usage, 1); | |
151 | INIT_WORK(&call->async_work, afs_process_async_call); | |
152 | init_waitqueue_head(&call->waitq); | |
2f02f7ae | 153 | |
341f741f DH |
154 | o = atomic_inc_return(&afs_outstanding_calls); |
155 | trace_afs_call(call, afs_call_trace_alloc, 1, o, | |
156 | __builtin_return_address(0)); | |
157 | return call; | |
00d3b7a4 DH |
158 | } |
159 | ||
6c67c7c3 | 160 | /* |
341f741f | 161 | * Dispose of a reference on a call. |
6c67c7c3 | 162 | */ |
341f741f | 163 | void afs_put_call(struct afs_call *call) |
6c67c7c3 | 164 | { |
341f741f DH |
165 | int n = atomic_dec_return(&call->usage); |
166 | int o = atomic_read(&afs_outstanding_calls); | |
167 | ||
168 | trace_afs_call(call, afs_call_trace_put, n + 1, o, | |
169 | __builtin_return_address(0)); | |
170 | ||
171 | ASSERTCMP(n, >=, 0); | |
172 | if (n == 0) { | |
173 | ASSERT(!work_pending(&call->async_work)); | |
174 | ASSERT(call->type->name != NULL); | |
175 | ||
176 | if (call->rxcall) { | |
177 | rxrpc_kernel_end_call(afs_socket, call->rxcall); | |
178 | call->rxcall = NULL; | |
179 | } | |
180 | if (call->type->destructor) | |
181 | call->type->destructor(call); | |
182 | ||
183 | kfree(call->request); | |
184 | kfree(call); | |
185 | ||
186 | o = atomic_dec_return(&afs_outstanding_calls); | |
187 | trace_afs_call(call, afs_call_trace_free, 0, o, | |
188 | __builtin_return_address(0)); | |
189 | if (o == 0) | |
190 | wake_up_atomic_t(&afs_outstanding_calls); | |
6c67c7c3 | 191 | } |
6cf12869 NWF |
192 | } |
193 | ||
194 | /* | |
341f741f | 195 | * Queue the call for actual work. Returns 0 unconditionally for convenience. |
6cf12869 | 196 | */ |
341f741f | 197 | int afs_queue_call_work(struct afs_call *call) |
6cf12869 | 198 | { |
341f741f DH |
199 | int u = atomic_inc_return(&call->usage); |
200 | ||
201 | trace_afs_call(call, afs_call_trace_work, u, | |
202 | atomic_read(&afs_outstanding_calls), | |
203 | __builtin_return_address(0)); | |
204 | ||
205 | INIT_WORK(&call->work, call->type->work); | |
206 | ||
207 | if (!queue_work(afs_wq, &call->work)) | |
208 | afs_put_call(call); | |
209 | return 0; | |
6c67c7c3 DH |
210 | } |
211 | ||
08e0e7c8 DH |
212 | /* |
213 | * allocate a call with flat request and reply buffers | |
214 | */ | |
215 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
d001648e | 216 | size_t request_size, size_t reply_max) |
08e0e7c8 DH |
217 | { |
218 | struct afs_call *call; | |
219 | ||
341f741f | 220 | call = afs_alloc_call(type, GFP_NOFS); |
08e0e7c8 DH |
221 | if (!call) |
222 | goto nomem_call; | |
223 | ||
224 | if (request_size) { | |
341f741f | 225 | call->request_size = request_size; |
08e0e7c8 DH |
226 | call->request = kmalloc(request_size, GFP_NOFS); |
227 | if (!call->request) | |
00d3b7a4 | 228 | goto nomem_free; |
08e0e7c8 DH |
229 | } |
230 | ||
d001648e | 231 | if (reply_max) { |
341f741f | 232 | call->reply_max = reply_max; |
d001648e | 233 | call->buffer = kmalloc(reply_max, GFP_NOFS); |
08e0e7c8 | 234 | if (!call->buffer) |
00d3b7a4 | 235 | goto nomem_free; |
08e0e7c8 DH |
236 | } |
237 | ||
08e0e7c8 | 238 | init_waitqueue_head(&call->waitq); |
08e0e7c8 DH |
239 | return call; |
240 | ||
00d3b7a4 | 241 | nomem_free: |
341f741f | 242 | afs_put_call(call); |
08e0e7c8 DH |
243 | nomem_call: |
244 | return NULL; | |
245 | } | |
246 | ||
247 | /* | |
248 | * clean up a call with flat buffer | |
249 | */ | |
250 | void afs_flat_call_destructor(struct afs_call *call) | |
251 | { | |
252 | _enter(""); | |
253 | ||
254 | kfree(call->request); | |
255 | call->request = NULL; | |
256 | kfree(call->buffer); | |
257 | call->buffer = NULL; | |
258 | } | |
259 | ||
31143d5d DH |
260 | /* |
261 | * attach the data from a bunch of pages on an inode to a call | |
262 | */ | |
39c6acea | 263 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg) |
31143d5d DH |
264 | { |
265 | struct page *pages[8]; | |
266 | unsigned count, n, loop, offset, to; | |
267 | pgoff_t first = call->first, last = call->last; | |
268 | int ret; | |
269 | ||
270 | _enter(""); | |
271 | ||
272 | offset = call->first_offset; | |
273 | call->first_offset = 0; | |
274 | ||
275 | do { | |
276 | _debug("attach %lx-%lx", first, last); | |
277 | ||
278 | count = last - first + 1; | |
279 | if (count > ARRAY_SIZE(pages)) | |
280 | count = ARRAY_SIZE(pages); | |
281 | n = find_get_pages_contig(call->mapping, first, count, pages); | |
282 | ASSERTCMP(n, ==, count); | |
283 | ||
284 | loop = 0; | |
285 | do { | |
39c6acea AV |
286 | struct bio_vec bvec = {.bv_page = pages[loop], |
287 | .bv_offset = offset}; | |
31143d5d DH |
288 | msg->msg_flags = 0; |
289 | to = PAGE_SIZE; | |
290 | if (first + loop >= last) | |
291 | to = call->last_to; | |
292 | else | |
293 | msg->msg_flags = MSG_MORE; | |
39c6acea | 294 | bvec.bv_len = to - offset; |
31143d5d DH |
295 | offset = 0; |
296 | ||
297 | _debug("- range %u-%u%s", | |
298 | offset, to, msg->msg_flags ? " [more]" : ""); | |
39c6acea AV |
299 | iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, |
300 | &bvec, 1, to - offset); | |
31143d5d DH |
301 | |
302 | /* have to change the state *before* sending the last | |
303 | * packet as RxRPC might give us the reply before it | |
304 | * returns from sending the request */ | |
305 | if (first + loop >= last) | |
306 | call->state = AFS_CALL_AWAIT_REPLY; | |
4de48af6 DH |
307 | ret = rxrpc_kernel_send_data(afs_socket, call->rxcall, |
308 | msg, to - offset); | |
31143d5d DH |
309 | if (ret < 0) |
310 | break; | |
311 | } while (++loop < count); | |
312 | first += count; | |
313 | ||
314 | for (loop = 0; loop < count; loop++) | |
315 | put_page(pages[loop]); | |
316 | if (ret < 0) | |
317 | break; | |
5bbf5d39 | 318 | } while (first <= last); |
31143d5d DH |
319 | |
320 | _leave(" = %d", ret); | |
321 | return ret; | |
322 | } | |
323 | ||
08e0e7c8 DH |
324 | /* |
325 | * initiate a call | |
326 | */ | |
327 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
56ff9c83 | 328 | bool async) |
08e0e7c8 DH |
329 | { |
330 | struct sockaddr_rxrpc srx; | |
331 | struct rxrpc_call *rxcall; | |
332 | struct msghdr msg; | |
333 | struct kvec iov[1]; | |
334 | int ret; | |
335 | ||
336 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
337 | ||
00d3b7a4 DH |
338 | ASSERT(call->type != NULL); |
339 | ASSERT(call->type->name != NULL); | |
340 | ||
31143d5d DH |
341 | _debug("____MAKE %p{%s,%x} [%d]____", |
342 | call, call->type->name, key_serial(call->key), | |
343 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 344 | |
56ff9c83 | 345 | call->async = async; |
08e0e7c8 DH |
346 | |
347 | memset(&srx, 0, sizeof(srx)); | |
348 | srx.srx_family = AF_RXRPC; | |
349 | srx.srx_service = call->service_id; | |
350 | srx.transport_type = SOCK_DGRAM; | |
351 | srx.transport_len = sizeof(srx.transport.sin); | |
352 | srx.transport.sin.sin_family = AF_INET; | |
353 | srx.transport.sin.sin_port = call->port; | |
354 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
355 | ||
356 | /* create a call */ | |
357 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
d001648e | 358 | (unsigned long) call, gfp, |
56ff9c83 DH |
359 | (async ? |
360 | afs_wake_up_async_call : | |
361 | afs_wake_up_call_waiter)); | |
00d3b7a4 | 362 | call->key = NULL; |
08e0e7c8 DH |
363 | if (IS_ERR(rxcall)) { |
364 | ret = PTR_ERR(rxcall); | |
365 | goto error_kill_call; | |
366 | } | |
367 | ||
368 | call->rxcall = rxcall; | |
369 | ||
370 | /* send the request */ | |
371 | iov[0].iov_base = call->request; | |
372 | iov[0].iov_len = call->request_size; | |
373 | ||
374 | msg.msg_name = NULL; | |
375 | msg.msg_namelen = 0; | |
2e90b1c4 | 376 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 377 | call->request_size); |
08e0e7c8 DH |
378 | msg.msg_control = NULL; |
379 | msg.msg_controllen = 0; | |
31143d5d | 380 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 DH |
381 | |
382 | /* have to change the state *before* sending the last packet as RxRPC | |
383 | * might give us the reply before it returns from sending the | |
384 | * request */ | |
31143d5d DH |
385 | if (!call->send_pages) |
386 | call->state = AFS_CALL_AWAIT_REPLY; | |
4de48af6 DH |
387 | ret = rxrpc_kernel_send_data(afs_socket, rxcall, |
388 | &msg, call->request_size); | |
08e0e7c8 DH |
389 | if (ret < 0) |
390 | goto error_do_abort; | |
391 | ||
31143d5d | 392 | if (call->send_pages) { |
39c6acea | 393 | ret = afs_send_pages(call, &msg); |
31143d5d DH |
394 | if (ret < 0) |
395 | goto error_do_abort; | |
396 | } | |
397 | ||
08e0e7c8 DH |
398 | /* at this point, an async call may no longer exist as it may have |
399 | * already completed */ | |
56ff9c83 DH |
400 | if (call->async) |
401 | return -EINPROGRESS; | |
402 | ||
403 | return afs_wait_for_call_to_complete(call); | |
08e0e7c8 DH |
404 | |
405 | error_do_abort: | |
5a42976d | 406 | rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, -ret, "KSD"); |
08e0e7c8 | 407 | error_kill_call: |
341f741f | 408 | afs_put_call(call); |
08e0e7c8 DH |
409 | _leave(" = %d", ret); |
410 | return ret; | |
411 | } | |
412 | ||
08e0e7c8 DH |
413 | /* |
414 | * deliver messages to a call | |
415 | */ | |
416 | static void afs_deliver_to_call(struct afs_call *call) | |
417 | { | |
08e0e7c8 DH |
418 | u32 abort_code; |
419 | int ret; | |
420 | ||
d001648e DH |
421 | _enter("%s", call->type->name); |
422 | ||
423 | while (call->state == AFS_CALL_AWAIT_REPLY || | |
424 | call->state == AFS_CALL_AWAIT_OP_ID || | |
425 | call->state == AFS_CALL_AWAIT_REQUEST || | |
426 | call->state == AFS_CALL_AWAIT_ACK | |
427 | ) { | |
428 | if (call->state == AFS_CALL_AWAIT_ACK) { | |
429 | size_t offset = 0; | |
430 | ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, | |
431 | NULL, 0, &offset, false, | |
432 | &call->abort_code); | |
8e8d7f13 DH |
433 | trace_afs_recv_data(call, 0, offset, false, ret); |
434 | ||
d001648e DH |
435 | if (ret == -EINPROGRESS || ret == -EAGAIN) |
436 | return; | |
9008f998 | 437 | if (ret == 1 || ret < 0) { |
d001648e DH |
438 | call->state = AFS_CALL_COMPLETE; |
439 | goto done; | |
08e0e7c8 | 440 | } |
d001648e | 441 | return; |
08e0e7c8 DH |
442 | } |
443 | ||
d001648e DH |
444 | ret = call->type->deliver(call); |
445 | switch (ret) { | |
446 | case 0: | |
447 | if (call->state == AFS_CALL_AWAIT_REPLY) | |
448 | call->state = AFS_CALL_COMPLETE; | |
449 | goto done; | |
450 | case -EINPROGRESS: | |
451 | case -EAGAIN: | |
452 | goto out; | |
453 | case -ENOTCONN: | |
454 | abort_code = RX_CALL_DEAD; | |
455 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
5a42976d | 456 | abort_code, -ret, "KNC"); |
d001648e DH |
457 | goto do_abort; |
458 | case -ENOTSUPP: | |
459 | abort_code = RX_INVALID_OPERATION; | |
460 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
5a42976d | 461 | abort_code, -ret, "KIV"); |
d001648e DH |
462 | goto do_abort; |
463 | case -ENODATA: | |
464 | case -EBADMSG: | |
465 | case -EMSGSIZE: | |
466 | default: | |
467 | abort_code = RXGEN_CC_UNMARSHAL; | |
468 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
469 | abort_code = RXGEN_SS_UNMARSHAL; | |
470 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
5a42976d | 471 | abort_code, EBADMSG, "KUM"); |
d001648e DH |
472 | goto do_abort; |
473 | } | |
08e0e7c8 DH |
474 | } |
475 | ||
d001648e DH |
476 | done: |
477 | if (call->state == AFS_CALL_COMPLETE && call->incoming) | |
341f741f | 478 | afs_put_call(call); |
d001648e | 479 | out: |
08e0e7c8 | 480 | _leave(""); |
d001648e DH |
481 | return; |
482 | ||
483 | do_abort: | |
484 | call->error = ret; | |
485 | call->state = AFS_CALL_COMPLETE; | |
486 | goto done; | |
08e0e7c8 DH |
487 | } |
488 | ||
489 | /* | |
490 | * wait synchronously for a call to complete | |
491 | */ | |
492 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
493 | { | |
5a42976d | 494 | const char *abort_why; |
08e0e7c8 DH |
495 | int ret; |
496 | ||
497 | DECLARE_WAITQUEUE(myself, current); | |
498 | ||
499 | _enter(""); | |
500 | ||
501 | add_wait_queue(&call->waitq, &myself); | |
502 | for (;;) { | |
503 | set_current_state(TASK_INTERRUPTIBLE); | |
504 | ||
505 | /* deliver any messages that are in the queue */ | |
d001648e DH |
506 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
507 | call->need_attention = false; | |
08e0e7c8 DH |
508 | __set_current_state(TASK_RUNNING); |
509 | afs_deliver_to_call(call); | |
510 | continue; | |
511 | } | |
512 | ||
5a42976d | 513 | abort_why = "KWC"; |
08e0e7c8 | 514 | ret = call->error; |
d001648e | 515 | if (call->state == AFS_CALL_COMPLETE) |
08e0e7c8 | 516 | break; |
5a42976d | 517 | abort_why = "KWI"; |
08e0e7c8 DH |
518 | ret = -EINTR; |
519 | if (signal_pending(current)) | |
520 | break; | |
521 | schedule(); | |
522 | } | |
523 | ||
524 | remove_wait_queue(&call->waitq, &myself); | |
525 | __set_current_state(TASK_RUNNING); | |
526 | ||
527 | /* kill the call */ | |
528 | if (call->state < AFS_CALL_COMPLETE) { | |
529 | _debug("call incomplete"); | |
d001648e | 530 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
5a42976d | 531 | RX_CALL_DEAD, -ret, abort_why); |
08e0e7c8 DH |
532 | } |
533 | ||
534 | _debug("call complete"); | |
341f741f | 535 | afs_put_call(call); |
08e0e7c8 DH |
536 | _leave(" = %d", ret); |
537 | return ret; | |
538 | } | |
539 | ||
540 | /* | |
541 | * wake up a waiting call | |
542 | */ | |
d001648e DH |
543 | static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, |
544 | unsigned long call_user_ID) | |
08e0e7c8 | 545 | { |
d001648e DH |
546 | struct afs_call *call = (struct afs_call *)call_user_ID; |
547 | ||
548 | call->need_attention = true; | |
08e0e7c8 DH |
549 | wake_up(&call->waitq); |
550 | } | |
551 | ||
552 | /* | |
553 | * wake up an asynchronous call | |
554 | */ | |
d001648e DH |
555 | static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, |
556 | unsigned long call_user_ID) | |
08e0e7c8 | 557 | { |
d001648e | 558 | struct afs_call *call = (struct afs_call *)call_user_ID; |
341f741f | 559 | int u; |
d001648e | 560 | |
8e8d7f13 | 561 | trace_afs_notify_call(rxcall, call); |
d001648e | 562 | call->need_attention = true; |
341f741f DH |
563 | |
564 | u = __atomic_add_unless(&call->usage, 1, 0); | |
565 | if (u != 0) { | |
566 | trace_afs_call(call, afs_call_trace_wake, u, | |
567 | atomic_read(&afs_outstanding_calls), | |
568 | __builtin_return_address(0)); | |
569 | ||
570 | if (!queue_work(afs_async_calls, &call->async_work)) | |
571 | afs_put_call(call); | |
572 | } | |
08e0e7c8 DH |
573 | } |
574 | ||
08e0e7c8 | 575 | /* |
341f741f DH |
576 | * Delete an asynchronous call. The work item carries a ref to the call struct |
577 | * that we need to release. | |
08e0e7c8 | 578 | */ |
d001648e | 579 | static void afs_delete_async_call(struct work_struct *work) |
08e0e7c8 | 580 | { |
d001648e DH |
581 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
582 | ||
08e0e7c8 DH |
583 | _enter(""); |
584 | ||
341f741f | 585 | afs_put_call(call); |
08e0e7c8 DH |
586 | |
587 | _leave(""); | |
588 | } | |
589 | ||
590 | /* | |
341f741f DH |
591 | * Perform I/O processing on an asynchronous call. The work item carries a ref |
592 | * to the call struct that we either need to release or to pass on. | |
08e0e7c8 | 593 | */ |
d001648e | 594 | static void afs_process_async_call(struct work_struct *work) |
08e0e7c8 | 595 | { |
d001648e DH |
596 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
597 | ||
08e0e7c8 DH |
598 | _enter(""); |
599 | ||
d001648e DH |
600 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
601 | call->need_attention = false; | |
08e0e7c8 | 602 | afs_deliver_to_call(call); |
d001648e | 603 | } |
08e0e7c8 | 604 | |
56ff9c83 | 605 | if (call->state == AFS_CALL_COMPLETE) { |
08e0e7c8 DH |
606 | call->reply = NULL; |
607 | ||
341f741f DH |
608 | /* We have two refs to release - one from the alloc and one |
609 | * queued with the work item - and we can't just deallocate the | |
610 | * call because the work item may be queued again. | |
611 | */ | |
d001648e | 612 | call->async_work.func = afs_delete_async_call; |
341f741f DH |
613 | if (!queue_work(afs_async_calls, &call->async_work)) |
614 | afs_put_call(call); | |
08e0e7c8 DH |
615 | } |
616 | ||
341f741f | 617 | afs_put_call(call); |
08e0e7c8 DH |
618 | _leave(""); |
619 | } | |
620 | ||
00e90712 DH |
621 | static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID) |
622 | { | |
623 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
624 | ||
625 | call->rxcall = rxcall; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Charge the incoming call preallocation. | |
630 | */ | |
631 | static void afs_charge_preallocation(struct work_struct *work) | |
632 | { | |
633 | struct afs_call *call = afs_spare_incoming_call; | |
634 | ||
635 | for (;;) { | |
636 | if (!call) { | |
341f741f | 637 | call = afs_alloc_call(&afs_RXCMxxxx, GFP_KERNEL); |
00e90712 DH |
638 | if (!call) |
639 | break; | |
640 | ||
56ff9c83 | 641 | call->async = true; |
00e90712 | 642 | call->state = AFS_CALL_AWAIT_OP_ID; |
56ff9c83 | 643 | init_waitqueue_head(&call->waitq); |
00e90712 DH |
644 | } |
645 | ||
646 | if (rxrpc_kernel_charge_accept(afs_socket, | |
647 | afs_wake_up_async_call, | |
648 | afs_rx_attach, | |
649 | (unsigned long)call, | |
650 | GFP_KERNEL) < 0) | |
651 | break; | |
652 | call = NULL; | |
653 | } | |
654 | afs_spare_incoming_call = call; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Discard a preallocated call when a socket is shut down. | |
659 | */ | |
660 | static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, | |
661 | unsigned long user_call_ID) | |
662 | { | |
663 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
664 | ||
00e90712 | 665 | call->rxcall = NULL; |
341f741f | 666 | afs_put_call(call); |
00e90712 DH |
667 | } |
668 | ||
d001648e DH |
669 | /* |
670 | * Notification of an incoming call. | |
671 | */ | |
00e90712 DH |
672 | static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, |
673 | unsigned long user_call_ID) | |
d001648e | 674 | { |
00e90712 | 675 | queue_work(afs_wq, &afs_charge_preallocation_work); |
d001648e DH |
676 | } |
677 | ||
08e0e7c8 | 678 | /* |
372ee163 DH |
679 | * Grab the operation ID from an incoming cache manager call. The socket |
680 | * buffer is discarded on error or if we don't yet have sufficient data. | |
08e0e7c8 | 681 | */ |
d001648e | 682 | static int afs_deliver_cm_op_id(struct afs_call *call) |
08e0e7c8 | 683 | { |
d001648e | 684 | int ret; |
08e0e7c8 | 685 | |
d001648e | 686 | _enter("{%zu}", call->offset); |
08e0e7c8 DH |
687 | |
688 | ASSERTCMP(call->offset, <, 4); | |
689 | ||
690 | /* the operation ID forms the first four bytes of the request data */ | |
50a2c953 | 691 | ret = afs_extract_data(call, &call->tmp, 4, true); |
d001648e DH |
692 | if (ret < 0) |
693 | return ret; | |
08e0e7c8 | 694 | |
50a2c953 | 695 | call->operation_ID = ntohl(call->tmp); |
08e0e7c8 | 696 | call->state = AFS_CALL_AWAIT_REQUEST; |
d001648e | 697 | call->offset = 0; |
08e0e7c8 DH |
698 | |
699 | /* ask the cache manager to route the call (it'll change the call type | |
700 | * if successful) */ | |
701 | if (!afs_cm_incoming_call(call)) | |
702 | return -ENOTSUPP; | |
703 | ||
8e8d7f13 DH |
704 | trace_afs_cb_call(call); |
705 | ||
08e0e7c8 DH |
706 | /* pass responsibility for the remainer of this message off to the |
707 | * cache manager op */ | |
d001648e | 708 | return call->type->deliver(call); |
08e0e7c8 DH |
709 | } |
710 | ||
711 | /* | |
712 | * send an empty reply | |
713 | */ | |
714 | void afs_send_empty_reply(struct afs_call *call) | |
715 | { | |
716 | struct msghdr msg; | |
08e0e7c8 DH |
717 | |
718 | _enter(""); | |
719 | ||
08e0e7c8 DH |
720 | msg.msg_name = NULL; |
721 | msg.msg_namelen = 0; | |
bfd4e956 | 722 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
723 | msg.msg_control = NULL; |
724 | msg.msg_controllen = 0; | |
725 | msg.msg_flags = 0; | |
726 | ||
727 | call->state = AFS_CALL_AWAIT_ACK; | |
4de48af6 | 728 | switch (rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, 0)) { |
08e0e7c8 DH |
729 | case 0: |
730 | _leave(" [replied]"); | |
731 | return; | |
732 | ||
733 | case -ENOMEM: | |
734 | _debug("oom"); | |
4de48af6 | 735 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
5a42976d | 736 | RX_USER_ABORT, ENOMEM, "KOO"); |
08e0e7c8 | 737 | default: |
08e0e7c8 DH |
738 | _leave(" [error]"); |
739 | return; | |
740 | } | |
741 | } | |
742 | ||
b908fe6b DH |
743 | /* |
744 | * send a simple reply | |
745 | */ | |
746 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
747 | { | |
748 | struct msghdr msg; | |
2e90b1c4 | 749 | struct kvec iov[1]; |
bd6dc742 | 750 | int n; |
b908fe6b DH |
751 | |
752 | _enter(""); | |
753 | ||
754 | iov[0].iov_base = (void *) buf; | |
755 | iov[0].iov_len = len; | |
756 | msg.msg_name = NULL; | |
757 | msg.msg_namelen = 0; | |
2e90b1c4 | 758 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
759 | msg.msg_control = NULL; |
760 | msg.msg_controllen = 0; | |
761 | msg.msg_flags = 0; | |
762 | ||
763 | call->state = AFS_CALL_AWAIT_ACK; | |
4de48af6 | 764 | n = rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, len); |
bd6dc742 | 765 | if (n >= 0) { |
6c67c7c3 | 766 | /* Success */ |
b908fe6b DH |
767 | _leave(" [replied]"); |
768 | return; | |
bd6dc742 | 769 | } |
6c67c7c3 | 770 | |
bd6dc742 | 771 | if (n == -ENOMEM) { |
b908fe6b | 772 | _debug("oom"); |
4de48af6 | 773 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
5a42976d | 774 | RX_USER_ABORT, ENOMEM, "KOO"); |
b908fe6b | 775 | } |
bd6dc742 | 776 | _leave(" [error]"); |
b908fe6b DH |
777 | } |
778 | ||
08e0e7c8 | 779 | /* |
372ee163 | 780 | * Extract a piece of data from the received data socket buffers. |
08e0e7c8 | 781 | */ |
d001648e DH |
782 | int afs_extract_data(struct afs_call *call, void *buf, size_t count, |
783 | bool want_more) | |
08e0e7c8 | 784 | { |
d001648e | 785 | int ret; |
08e0e7c8 | 786 | |
d001648e DH |
787 | _enter("{%s,%zu},,%zu,%d", |
788 | call->type->name, call->offset, count, want_more); | |
08e0e7c8 | 789 | |
d001648e | 790 | ASSERTCMP(call->offset, <=, count); |
08e0e7c8 | 791 | |
d001648e DH |
792 | ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, |
793 | buf, count, &call->offset, | |
794 | want_more, &call->abort_code); | |
8e8d7f13 | 795 | trace_afs_recv_data(call, count, call->offset, want_more, ret); |
d001648e DH |
796 | if (ret == 0 || ret == -EAGAIN) |
797 | return ret; | |
08e0e7c8 | 798 | |
d001648e DH |
799 | if (ret == 1) { |
800 | switch (call->state) { | |
801 | case AFS_CALL_AWAIT_REPLY: | |
802 | call->state = AFS_CALL_COMPLETE; | |
803 | break; | |
804 | case AFS_CALL_AWAIT_REQUEST: | |
805 | call->state = AFS_CALL_REPLYING; | |
806 | break; | |
807 | default: | |
808 | break; | |
809 | } | |
810 | return 0; | |
08e0e7c8 | 811 | } |
d001648e DH |
812 | |
813 | if (ret == -ECONNABORTED) | |
814 | call->error = call->type->abort_to_error(call->abort_code); | |
815 | else | |
816 | call->error = ret; | |
817 | call->state = AFS_CALL_COMPLETE; | |
818 | return ret; | |
08e0e7c8 | 819 | } |