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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> |
174cd4b1 IM |
13 | #include <linux/sched/signal.h> |
14 | ||
08e0e7c8 DH |
15 | #include <net/sock.h> |
16 | #include <net/af_rxrpc.h> | |
08e0e7c8 DH |
17 | #include "internal.h" |
18 | #include "afs_cm.h" | |
19 | ||
f044c884 | 20 | struct workqueue_struct *afs_async_calls; |
08e0e7c8 | 21 | |
d001648e | 22 | static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long); |
33cd7f2b | 23 | static long afs_wait_for_call_to_complete(struct afs_call *); |
d001648e | 24 | static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long); |
d001648e | 25 | static void afs_process_async_call(struct work_struct *); |
00e90712 DH |
26 | static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long); |
27 | static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long); | |
d001648e | 28 | static int afs_deliver_cm_op_id(struct afs_call *); |
08e0e7c8 | 29 | |
08e0e7c8 DH |
30 | /* asynchronous incoming call initial processing */ |
31 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 32 | .name = "CB.xxxx", |
08e0e7c8 | 33 | .deliver = afs_deliver_cm_op_id, |
08e0e7c8 DH |
34 | }; |
35 | ||
08e0e7c8 DH |
36 | /* |
37 | * open an RxRPC socket and bind it to be a server for callback notifications | |
38 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
39 | */ | |
f044c884 | 40 | int afs_open_socket(struct afs_net *net) |
08e0e7c8 DH |
41 | { |
42 | struct sockaddr_rxrpc srx; | |
43 | struct socket *socket; | |
44 | int ret; | |
45 | ||
46 | _enter(""); | |
47 | ||
3838d3ec | 48 | ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket); |
0e119b41 DH |
49 | if (ret < 0) |
50 | goto error_1; | |
08e0e7c8 DH |
51 | |
52 | socket->sk->sk_allocation = GFP_NOFS; | |
53 | ||
54 | /* bind the callback manager's address to make this a server socket */ | |
3838d3ec | 55 | memset(&srx, 0, sizeof(srx)); |
08e0e7c8 DH |
56 | srx.srx_family = AF_RXRPC; |
57 | srx.srx_service = CM_SERVICE; | |
58 | srx.transport_type = SOCK_DGRAM; | |
3838d3ec DH |
59 | srx.transport_len = sizeof(srx.transport.sin6); |
60 | srx.transport.sin6.sin6_family = AF_INET6; | |
61 | srx.transport.sin6.sin6_port = htons(AFS_CM_PORT); | |
08e0e7c8 DH |
62 | |
63 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
0e119b41 DH |
64 | if (ret < 0) |
65 | goto error_2; | |
66 | ||
00e90712 DH |
67 | rxrpc_kernel_new_call_notification(socket, afs_rx_new_call, |
68 | afs_rx_discard_new_call); | |
d001648e | 69 | |
0e119b41 DH |
70 | ret = kernel_listen(socket, INT_MAX); |
71 | if (ret < 0) | |
72 | goto error_2; | |
08e0e7c8 | 73 | |
f044c884 DH |
74 | net->socket = socket; |
75 | afs_charge_preallocation(&net->charge_preallocation_work); | |
08e0e7c8 DH |
76 | _leave(" = 0"); |
77 | return 0; | |
0e119b41 DH |
78 | |
79 | error_2: | |
80 | sock_release(socket); | |
81 | error_1: | |
0e119b41 DH |
82 | _leave(" = %d", ret); |
83 | return ret; | |
08e0e7c8 DH |
84 | } |
85 | ||
86 | /* | |
87 | * close the RxRPC socket AFS was using | |
88 | */ | |
f044c884 | 89 | void afs_close_socket(struct afs_net *net) |
08e0e7c8 DH |
90 | { |
91 | _enter(""); | |
92 | ||
f044c884 | 93 | kernel_listen(net->socket, 0); |
341f741f DH |
94 | flush_workqueue(afs_async_calls); |
95 | ||
f044c884 DH |
96 | if (net->spare_incoming_call) { |
97 | afs_put_call(net->spare_incoming_call); | |
98 | net->spare_incoming_call = NULL; | |
00e90712 DH |
99 | } |
100 | ||
f044c884 DH |
101 | _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls)); |
102 | wait_on_atomic_t(&net->nr_outstanding_calls, atomic_t_wait, | |
2f02f7ae DH |
103 | TASK_UNINTERRUPTIBLE); |
104 | _debug("no outstanding calls"); | |
105 | ||
f044c884 | 106 | kernel_sock_shutdown(net->socket, SHUT_RDWR); |
d001648e | 107 | flush_workqueue(afs_async_calls); |
f044c884 | 108 | sock_release(net->socket); |
08e0e7c8 DH |
109 | |
110 | _debug("dework"); | |
08e0e7c8 DH |
111 | _leave(""); |
112 | } | |
113 | ||
00d3b7a4 | 114 | /* |
341f741f | 115 | * Allocate a call. |
00d3b7a4 | 116 | */ |
f044c884 DH |
117 | static struct afs_call *afs_alloc_call(struct afs_net *net, |
118 | const struct afs_call_type *type, | |
341f741f | 119 | gfp_t gfp) |
00d3b7a4 | 120 | { |
341f741f DH |
121 | struct afs_call *call; |
122 | int o; | |
00d3b7a4 | 123 | |
341f741f DH |
124 | call = kzalloc(sizeof(*call), gfp); |
125 | if (!call) | |
126 | return NULL; | |
00d3b7a4 | 127 | |
341f741f | 128 | call->type = type; |
f044c884 | 129 | call->net = net; |
341f741f DH |
130 | atomic_set(&call->usage, 1); |
131 | INIT_WORK(&call->async_work, afs_process_async_call); | |
132 | init_waitqueue_head(&call->waitq); | |
2f02f7ae | 133 | |
f044c884 | 134 | o = atomic_inc_return(&net->nr_outstanding_calls); |
341f741f DH |
135 | trace_afs_call(call, afs_call_trace_alloc, 1, o, |
136 | __builtin_return_address(0)); | |
137 | return call; | |
00d3b7a4 DH |
138 | } |
139 | ||
6c67c7c3 | 140 | /* |
341f741f | 141 | * Dispose of a reference on a call. |
6c67c7c3 | 142 | */ |
341f741f | 143 | void afs_put_call(struct afs_call *call) |
6c67c7c3 | 144 | { |
f044c884 | 145 | struct afs_net *net = call->net; |
341f741f | 146 | int n = atomic_dec_return(&call->usage); |
f044c884 | 147 | int o = atomic_read(&net->nr_outstanding_calls); |
341f741f DH |
148 | |
149 | trace_afs_call(call, afs_call_trace_put, n + 1, o, | |
150 | __builtin_return_address(0)); | |
151 | ||
152 | ASSERTCMP(n, >=, 0); | |
153 | if (n == 0) { | |
154 | ASSERT(!work_pending(&call->async_work)); | |
155 | ASSERT(call->type->name != NULL); | |
156 | ||
157 | if (call->rxcall) { | |
f044c884 | 158 | rxrpc_kernel_end_call(net->socket, call->rxcall); |
341f741f DH |
159 | call->rxcall = NULL; |
160 | } | |
161 | if (call->type->destructor) | |
162 | call->type->destructor(call); | |
163 | ||
164 | kfree(call->request); | |
165 | kfree(call); | |
166 | ||
f044c884 | 167 | o = atomic_dec_return(&net->nr_outstanding_calls); |
341f741f DH |
168 | trace_afs_call(call, afs_call_trace_free, 0, o, |
169 | __builtin_return_address(0)); | |
170 | if (o == 0) | |
f044c884 | 171 | wake_up_atomic_t(&net->nr_outstanding_calls); |
6c67c7c3 | 172 | } |
6cf12869 NWF |
173 | } |
174 | ||
175 | /* | |
341f741f | 176 | * Queue the call for actual work. Returns 0 unconditionally for convenience. |
6cf12869 | 177 | */ |
341f741f | 178 | int afs_queue_call_work(struct afs_call *call) |
6cf12869 | 179 | { |
341f741f DH |
180 | int u = atomic_inc_return(&call->usage); |
181 | ||
182 | trace_afs_call(call, afs_call_trace_work, u, | |
f044c884 | 183 | atomic_read(&call->net->nr_outstanding_calls), |
341f741f DH |
184 | __builtin_return_address(0)); |
185 | ||
186 | INIT_WORK(&call->work, call->type->work); | |
187 | ||
188 | if (!queue_work(afs_wq, &call->work)) | |
189 | afs_put_call(call); | |
190 | return 0; | |
6c67c7c3 DH |
191 | } |
192 | ||
08e0e7c8 DH |
193 | /* |
194 | * allocate a call with flat request and reply buffers | |
195 | */ | |
f044c884 DH |
196 | struct afs_call *afs_alloc_flat_call(struct afs_net *net, |
197 | const struct afs_call_type *type, | |
d001648e | 198 | size_t request_size, size_t reply_max) |
08e0e7c8 DH |
199 | { |
200 | struct afs_call *call; | |
201 | ||
f044c884 | 202 | call = afs_alloc_call(net, type, GFP_NOFS); |
08e0e7c8 DH |
203 | if (!call) |
204 | goto nomem_call; | |
205 | ||
206 | if (request_size) { | |
341f741f | 207 | call->request_size = request_size; |
08e0e7c8 DH |
208 | call->request = kmalloc(request_size, GFP_NOFS); |
209 | if (!call->request) | |
00d3b7a4 | 210 | goto nomem_free; |
08e0e7c8 DH |
211 | } |
212 | ||
d001648e | 213 | if (reply_max) { |
341f741f | 214 | call->reply_max = reply_max; |
d001648e | 215 | call->buffer = kmalloc(reply_max, GFP_NOFS); |
08e0e7c8 | 216 | if (!call->buffer) |
00d3b7a4 | 217 | goto nomem_free; |
08e0e7c8 DH |
218 | } |
219 | ||
08e0e7c8 | 220 | init_waitqueue_head(&call->waitq); |
08e0e7c8 DH |
221 | return call; |
222 | ||
00d3b7a4 | 223 | nomem_free: |
341f741f | 224 | afs_put_call(call); |
08e0e7c8 DH |
225 | nomem_call: |
226 | return NULL; | |
227 | } | |
228 | ||
229 | /* | |
230 | * clean up a call with flat buffer | |
231 | */ | |
232 | void afs_flat_call_destructor(struct afs_call *call) | |
233 | { | |
234 | _enter(""); | |
235 | ||
236 | kfree(call->request); | |
237 | call->request = NULL; | |
238 | kfree(call->buffer); | |
239 | call->buffer = NULL; | |
240 | } | |
241 | ||
2f5705a5 DH |
242 | #define AFS_BVEC_MAX 8 |
243 | ||
244 | /* | |
245 | * Load the given bvec with the next few pages. | |
246 | */ | |
247 | static void afs_load_bvec(struct afs_call *call, struct msghdr *msg, | |
248 | struct bio_vec *bv, pgoff_t first, pgoff_t last, | |
249 | unsigned offset) | |
250 | { | |
251 | struct page *pages[AFS_BVEC_MAX]; | |
252 | unsigned int nr, n, i, to, bytes = 0; | |
253 | ||
254 | nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX); | |
255 | n = find_get_pages_contig(call->mapping, first, nr, pages); | |
256 | ASSERTCMP(n, ==, nr); | |
257 | ||
258 | msg->msg_flags |= MSG_MORE; | |
259 | for (i = 0; i < nr; i++) { | |
260 | to = PAGE_SIZE; | |
261 | if (first + i >= last) { | |
262 | to = call->last_to; | |
263 | msg->msg_flags &= ~MSG_MORE; | |
264 | } | |
265 | bv[i].bv_page = pages[i]; | |
266 | bv[i].bv_len = to - offset; | |
267 | bv[i].bv_offset = offset; | |
268 | bytes += to - offset; | |
269 | offset = 0; | |
270 | } | |
271 | ||
272 | iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes); | |
273 | } | |
274 | ||
e833251a DH |
275 | /* |
276 | * Advance the AFS call state when the RxRPC call ends the transmit phase. | |
277 | */ | |
278 | static void afs_notify_end_request_tx(struct sock *sock, | |
279 | struct rxrpc_call *rxcall, | |
280 | unsigned long call_user_ID) | |
281 | { | |
282 | struct afs_call *call = (struct afs_call *)call_user_ID; | |
283 | ||
284 | if (call->state == AFS_CALL_REQUESTING) | |
285 | call->state = AFS_CALL_AWAIT_REPLY; | |
286 | } | |
287 | ||
31143d5d DH |
288 | /* |
289 | * attach the data from a bunch of pages on an inode to a call | |
290 | */ | |
39c6acea | 291 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg) |
31143d5d | 292 | { |
2f5705a5 DH |
293 | struct bio_vec bv[AFS_BVEC_MAX]; |
294 | unsigned int bytes, nr, loop, offset; | |
31143d5d DH |
295 | pgoff_t first = call->first, last = call->last; |
296 | int ret; | |
297 | ||
31143d5d DH |
298 | offset = call->first_offset; |
299 | call->first_offset = 0; | |
300 | ||
301 | do { | |
2f5705a5 DH |
302 | afs_load_bvec(call, msg, bv, first, last, offset); |
303 | offset = 0; | |
304 | bytes = msg->msg_iter.count; | |
305 | nr = msg->msg_iter.nr_segs; | |
306 | ||
f044c884 | 307 | ret = rxrpc_kernel_send_data(call->net->socket, call->rxcall, msg, |
e833251a | 308 | bytes, afs_notify_end_request_tx); |
2f5705a5 DH |
309 | for (loop = 0; loop < nr; loop++) |
310 | put_page(bv[loop].bv_page); | |
31143d5d DH |
311 | if (ret < 0) |
312 | break; | |
2f5705a5 DH |
313 | |
314 | first += nr; | |
5bbf5d39 | 315 | } while (first <= last); |
31143d5d | 316 | |
31143d5d DH |
317 | return ret; |
318 | } | |
319 | ||
08e0e7c8 DH |
320 | /* |
321 | * initiate a call | |
322 | */ | |
33cd7f2b DH |
323 | long afs_make_call(struct sockaddr_rxrpc *srx, struct afs_call *call, |
324 | gfp_t gfp, bool async) | |
08e0e7c8 | 325 | { |
08e0e7c8 DH |
326 | struct rxrpc_call *rxcall; |
327 | struct msghdr msg; | |
328 | struct kvec iov[1]; | |
70af0e3b | 329 | size_t offset; |
e754eba6 | 330 | s64 tx_total_len; |
70af0e3b | 331 | u32 abort_code; |
08e0e7c8 DH |
332 | int ret; |
333 | ||
4d9df986 | 334 | _enter(",{%pISp},", &srx->transport); |
08e0e7c8 | 335 | |
00d3b7a4 DH |
336 | ASSERT(call->type != NULL); |
337 | ASSERT(call->type->name != NULL); | |
338 | ||
31143d5d DH |
339 | _debug("____MAKE %p{%s,%x} [%d]____", |
340 | call, call->type->name, key_serial(call->key), | |
f044c884 | 341 | atomic_read(&call->net->nr_outstanding_calls)); |
00d3b7a4 | 342 | |
56ff9c83 | 343 | call->async = async; |
08e0e7c8 | 344 | |
e754eba6 DH |
345 | /* Work out the length we're going to transmit. This is awkward for |
346 | * calls such as FS.StoreData where there's an extra injection of data | |
347 | * after the initial fixed part. | |
348 | */ | |
349 | tx_total_len = call->request_size; | |
350 | if (call->send_pages) { | |
351 | tx_total_len += call->last_to - call->first_offset; | |
352 | tx_total_len += (call->last - call->first) * PAGE_SIZE; | |
353 | } | |
354 | ||
08e0e7c8 | 355 | /* create a call */ |
4d9df986 | 356 | rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key, |
e754eba6 DH |
357 | (unsigned long)call, |
358 | tx_total_len, gfp, | |
56ff9c83 DH |
359 | (async ? |
360 | afs_wake_up_async_call : | |
a68f4a27 DH |
361 | afs_wake_up_call_waiter), |
362 | call->upgrade); | |
00d3b7a4 | 363 | call->key = NULL; |
08e0e7c8 DH |
364 | if (IS_ERR(rxcall)) { |
365 | ret = PTR_ERR(rxcall); | |
366 | goto error_kill_call; | |
367 | } | |
368 | ||
369 | call->rxcall = rxcall; | |
370 | ||
371 | /* send the request */ | |
372 | iov[0].iov_base = call->request; | |
373 | iov[0].iov_len = call->request_size; | |
374 | ||
375 | msg.msg_name = NULL; | |
376 | msg.msg_namelen = 0; | |
2e90b1c4 | 377 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 378 | call->request_size); |
08e0e7c8 DH |
379 | msg.msg_control = NULL; |
380 | msg.msg_controllen = 0; | |
bc5e3a54 | 381 | msg.msg_flags = MSG_WAITALL | (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 | 382 | |
70af0e3b DH |
383 | /* We have to change the state *before* sending the last packet as |
384 | * rxrpc might give us the reply before it returns from sending the | |
385 | * request. Further, if the send fails, we may already have been given | |
386 | * a notification and may have collected it. | |
387 | */ | |
31143d5d DH |
388 | if (!call->send_pages) |
389 | call->state = AFS_CALL_AWAIT_REPLY; | |
f044c884 | 390 | ret = rxrpc_kernel_send_data(call->net->socket, rxcall, |
e833251a DH |
391 | &msg, call->request_size, |
392 | afs_notify_end_request_tx); | |
08e0e7c8 DH |
393 | if (ret < 0) |
394 | goto error_do_abort; | |
395 | ||
31143d5d | 396 | if (call->send_pages) { |
39c6acea | 397 | ret = afs_send_pages(call, &msg); |
31143d5d DH |
398 | if (ret < 0) |
399 | goto error_do_abort; | |
400 | } | |
401 | ||
08e0e7c8 DH |
402 | /* at this point, an async call may no longer exist as it may have |
403 | * already completed */ | |
56ff9c83 DH |
404 | if (call->async) |
405 | return -EINPROGRESS; | |
406 | ||
407 | return afs_wait_for_call_to_complete(call); | |
08e0e7c8 DH |
408 | |
409 | error_do_abort: | |
70af0e3b DH |
410 | call->state = AFS_CALL_COMPLETE; |
411 | if (ret != -ECONNABORTED) { | |
f044c884 DH |
412 | rxrpc_kernel_abort_call(call->net->socket, rxcall, |
413 | RX_USER_ABORT, ret, "KSD"); | |
70af0e3b DH |
414 | } else { |
415 | abort_code = 0; | |
416 | offset = 0; | |
f044c884 | 417 | rxrpc_kernel_recv_data(call->net->socket, rxcall, NULL, |
33cd7f2b | 418 | 0, &offset, false, &call->abort_code, |
f044c884 | 419 | &call->service_id); |
33cd7f2b | 420 | ret = afs_abort_to_error(call->abort_code); |
70af0e3b | 421 | } |
08e0e7c8 | 422 | error_kill_call: |
341f741f | 423 | afs_put_call(call); |
08e0e7c8 DH |
424 | _leave(" = %d", ret); |
425 | return ret; | |
426 | } | |
427 | ||
08e0e7c8 DH |
428 | /* |
429 | * deliver messages to a call | |
430 | */ | |
431 | static void afs_deliver_to_call(struct afs_call *call) | |
432 | { | |
08e0e7c8 DH |
433 | u32 abort_code; |
434 | int ret; | |
435 | ||
d001648e DH |
436 | _enter("%s", call->type->name); |
437 | ||
438 | while (call->state == AFS_CALL_AWAIT_REPLY || | |
439 | call->state == AFS_CALL_AWAIT_OP_ID || | |
440 | call->state == AFS_CALL_AWAIT_REQUEST || | |
441 | call->state == AFS_CALL_AWAIT_ACK | |
442 | ) { | |
443 | if (call->state == AFS_CALL_AWAIT_ACK) { | |
444 | size_t offset = 0; | |
f044c884 DH |
445 | ret = rxrpc_kernel_recv_data(call->net->socket, |
446 | call->rxcall, | |
d001648e | 447 | NULL, 0, &offset, false, |
a68f4a27 DH |
448 | &call->abort_code, |
449 | &call->service_id); | |
8e8d7f13 DH |
450 | trace_afs_recv_data(call, 0, offset, false, ret); |
451 | ||
d001648e DH |
452 | if (ret == -EINPROGRESS || ret == -EAGAIN) |
453 | return; | |
9008f998 | 454 | if (ret == 1 || ret < 0) { |
d001648e DH |
455 | call->state = AFS_CALL_COMPLETE; |
456 | goto done; | |
08e0e7c8 | 457 | } |
d001648e | 458 | return; |
08e0e7c8 DH |
459 | } |
460 | ||
d001648e DH |
461 | ret = call->type->deliver(call); |
462 | switch (ret) { | |
463 | case 0: | |
464 | if (call->state == AFS_CALL_AWAIT_REPLY) | |
465 | call->state = AFS_CALL_COMPLETE; | |
466 | goto done; | |
467 | case -EINPROGRESS: | |
468 | case -EAGAIN: | |
469 | goto out; | |
70af0e3b | 470 | case -ECONNABORTED: |
33cd7f2b | 471 | goto save_error; |
d001648e DH |
472 | case -ENOTCONN: |
473 | abort_code = RX_CALL_DEAD; | |
f044c884 | 474 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 475 | abort_code, ret, "KNC"); |
70af0e3b | 476 | goto save_error; |
d001648e | 477 | case -ENOTSUPP: |
1157f153 | 478 | abort_code = RXGEN_OPCODE; |
f044c884 | 479 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 480 | abort_code, ret, "KIV"); |
70af0e3b | 481 | goto save_error; |
d001648e DH |
482 | case -ENODATA: |
483 | case -EBADMSG: | |
484 | case -EMSGSIZE: | |
485 | default: | |
486 | abort_code = RXGEN_CC_UNMARSHAL; | |
487 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
488 | abort_code = RXGEN_SS_UNMARSHAL; | |
f044c884 | 489 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 490 | abort_code, -EBADMSG, "KUM"); |
70af0e3b | 491 | goto save_error; |
d001648e | 492 | } |
08e0e7c8 DH |
493 | } |
494 | ||
d001648e DH |
495 | done: |
496 | if (call->state == AFS_CALL_COMPLETE && call->incoming) | |
341f741f | 497 | afs_put_call(call); |
d001648e | 498 | out: |
08e0e7c8 | 499 | _leave(""); |
d001648e DH |
500 | return; |
501 | ||
70af0e3b | 502 | save_error: |
d001648e DH |
503 | call->error = ret; |
504 | call->state = AFS_CALL_COMPLETE; | |
505 | goto done; | |
08e0e7c8 DH |
506 | } |
507 | ||
508 | /* | |
509 | * wait synchronously for a call to complete | |
510 | */ | |
33cd7f2b | 511 | static long afs_wait_for_call_to_complete(struct afs_call *call) |
08e0e7c8 | 512 | { |
bc5e3a54 | 513 | signed long rtt2, timeout; |
33cd7f2b | 514 | long ret; |
bc5e3a54 DH |
515 | u64 rtt; |
516 | u32 life, last_life; | |
08e0e7c8 DH |
517 | |
518 | DECLARE_WAITQUEUE(myself, current); | |
519 | ||
520 | _enter(""); | |
521 | ||
f044c884 | 522 | rtt = rxrpc_kernel_get_rtt(call->net->socket, call->rxcall); |
bc5e3a54 DH |
523 | rtt2 = nsecs_to_jiffies64(rtt) * 2; |
524 | if (rtt2 < 2) | |
525 | rtt2 = 2; | |
526 | ||
527 | timeout = rtt2; | |
f044c884 | 528 | last_life = rxrpc_kernel_check_life(call->net->socket, call->rxcall); |
bc5e3a54 | 529 | |
08e0e7c8 DH |
530 | add_wait_queue(&call->waitq, &myself); |
531 | for (;;) { | |
bc5e3a54 | 532 | set_current_state(TASK_UNINTERRUPTIBLE); |
08e0e7c8 DH |
533 | |
534 | /* deliver any messages that are in the queue */ | |
d001648e DH |
535 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
536 | call->need_attention = false; | |
08e0e7c8 DH |
537 | __set_current_state(TASK_RUNNING); |
538 | afs_deliver_to_call(call); | |
539 | continue; | |
540 | } | |
541 | ||
bc5e3a54 | 542 | if (call->state == AFS_CALL_COMPLETE) |
08e0e7c8 | 543 | break; |
bc5e3a54 | 544 | |
f044c884 | 545 | life = rxrpc_kernel_check_life(call->net->socket, call->rxcall); |
bc5e3a54 DH |
546 | if (timeout == 0 && |
547 | life == last_life && signal_pending(current)) | |
548 | break; | |
549 | ||
550 | if (life != last_life) { | |
551 | timeout = rtt2; | |
552 | last_life = life; | |
553 | } | |
554 | ||
555 | timeout = schedule_timeout(timeout); | |
08e0e7c8 DH |
556 | } |
557 | ||
558 | remove_wait_queue(&call->waitq, &myself); | |
559 | __set_current_state(TASK_RUNNING); | |
560 | ||
954cd6dc | 561 | /* Kill off the call if it's still live. */ |
08e0e7c8 | 562 | if (call->state < AFS_CALL_COMPLETE) { |
954cd6dc | 563 | _debug("call interrupted"); |
f044c884 | 564 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
954cd6dc | 565 | RX_USER_ABORT, -EINTR, "KWI"); |
08e0e7c8 DH |
566 | } |
567 | ||
954cd6dc | 568 | ret = call->error; |
33cd7f2b DH |
569 | if (ret < 0) { |
570 | ret = afs_abort_to_error(call->abort_code); | |
571 | } else if (ret == 0 && call->ret_reply0) { | |
572 | ret = (long)call->reply[0]; | |
573 | call->reply[0] = NULL; | |
574 | } | |
575 | ||
08e0e7c8 | 576 | _debug("call complete"); |
341f741f | 577 | afs_put_call(call); |
33cd7f2b | 578 | _leave(" = %p", (void *)ret); |
08e0e7c8 DH |
579 | return ret; |
580 | } | |
581 | ||
582 | /* | |
583 | * wake up a waiting call | |
584 | */ | |
d001648e DH |
585 | static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, |
586 | unsigned long call_user_ID) | |
08e0e7c8 | 587 | { |
d001648e DH |
588 | struct afs_call *call = (struct afs_call *)call_user_ID; |
589 | ||
590 | call->need_attention = true; | |
08e0e7c8 DH |
591 | wake_up(&call->waitq); |
592 | } | |
593 | ||
594 | /* | |
595 | * wake up an asynchronous call | |
596 | */ | |
d001648e DH |
597 | static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, |
598 | unsigned long call_user_ID) | |
08e0e7c8 | 599 | { |
d001648e | 600 | struct afs_call *call = (struct afs_call *)call_user_ID; |
341f741f | 601 | int u; |
d001648e | 602 | |
8e8d7f13 | 603 | trace_afs_notify_call(rxcall, call); |
d001648e | 604 | call->need_attention = true; |
341f741f DH |
605 | |
606 | u = __atomic_add_unless(&call->usage, 1, 0); | |
607 | if (u != 0) { | |
608 | trace_afs_call(call, afs_call_trace_wake, u, | |
f044c884 | 609 | atomic_read(&call->net->nr_outstanding_calls), |
341f741f DH |
610 | __builtin_return_address(0)); |
611 | ||
612 | if (!queue_work(afs_async_calls, &call->async_work)) | |
613 | afs_put_call(call); | |
614 | } | |
08e0e7c8 DH |
615 | } |
616 | ||
08e0e7c8 | 617 | /* |
341f741f DH |
618 | * Delete an asynchronous call. The work item carries a ref to the call struct |
619 | * that we need to release. | |
08e0e7c8 | 620 | */ |
d001648e | 621 | static void afs_delete_async_call(struct work_struct *work) |
08e0e7c8 | 622 | { |
d001648e DH |
623 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
624 | ||
08e0e7c8 DH |
625 | _enter(""); |
626 | ||
341f741f | 627 | afs_put_call(call); |
08e0e7c8 DH |
628 | |
629 | _leave(""); | |
630 | } | |
631 | ||
632 | /* | |
341f741f DH |
633 | * Perform I/O processing on an asynchronous call. The work item carries a ref |
634 | * to the call struct that we either need to release or to pass on. | |
08e0e7c8 | 635 | */ |
d001648e | 636 | static void afs_process_async_call(struct work_struct *work) |
08e0e7c8 | 637 | { |
d001648e DH |
638 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
639 | ||
08e0e7c8 DH |
640 | _enter(""); |
641 | ||
d001648e DH |
642 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
643 | call->need_attention = false; | |
08e0e7c8 | 644 | afs_deliver_to_call(call); |
d001648e | 645 | } |
08e0e7c8 | 646 | |
56ff9c83 | 647 | if (call->state == AFS_CALL_COMPLETE) { |
97e3043a | 648 | call->reply[0] = NULL; |
08e0e7c8 | 649 | |
341f741f DH |
650 | /* We have two refs to release - one from the alloc and one |
651 | * queued with the work item - and we can't just deallocate the | |
652 | * call because the work item may be queued again. | |
653 | */ | |
d001648e | 654 | call->async_work.func = afs_delete_async_call; |
341f741f DH |
655 | if (!queue_work(afs_async_calls, &call->async_work)) |
656 | afs_put_call(call); | |
08e0e7c8 DH |
657 | } |
658 | ||
341f741f | 659 | afs_put_call(call); |
08e0e7c8 DH |
660 | _leave(""); |
661 | } | |
662 | ||
00e90712 DH |
663 | static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID) |
664 | { | |
665 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
666 | ||
667 | call->rxcall = rxcall; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Charge the incoming call preallocation. | |
672 | */ | |
f044c884 | 673 | void afs_charge_preallocation(struct work_struct *work) |
00e90712 | 674 | { |
f044c884 DH |
675 | struct afs_net *net = |
676 | container_of(work, struct afs_net, charge_preallocation_work); | |
677 | struct afs_call *call = net->spare_incoming_call; | |
00e90712 DH |
678 | |
679 | for (;;) { | |
680 | if (!call) { | |
f044c884 | 681 | call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL); |
00e90712 DH |
682 | if (!call) |
683 | break; | |
684 | ||
56ff9c83 | 685 | call->async = true; |
00e90712 | 686 | call->state = AFS_CALL_AWAIT_OP_ID; |
56ff9c83 | 687 | init_waitqueue_head(&call->waitq); |
00e90712 DH |
688 | } |
689 | ||
f044c884 | 690 | if (rxrpc_kernel_charge_accept(net->socket, |
00e90712 DH |
691 | afs_wake_up_async_call, |
692 | afs_rx_attach, | |
693 | (unsigned long)call, | |
694 | GFP_KERNEL) < 0) | |
695 | break; | |
696 | call = NULL; | |
697 | } | |
f044c884 | 698 | net->spare_incoming_call = call; |
00e90712 DH |
699 | } |
700 | ||
701 | /* | |
702 | * Discard a preallocated call when a socket is shut down. | |
703 | */ | |
704 | static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, | |
705 | unsigned long user_call_ID) | |
706 | { | |
707 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
708 | ||
00e90712 | 709 | call->rxcall = NULL; |
341f741f | 710 | afs_put_call(call); |
00e90712 DH |
711 | } |
712 | ||
d001648e DH |
713 | /* |
714 | * Notification of an incoming call. | |
715 | */ | |
00e90712 DH |
716 | static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, |
717 | unsigned long user_call_ID) | |
d001648e | 718 | { |
f044c884 DH |
719 | struct afs_net *net = afs_sock2net(sk); |
720 | ||
721 | queue_work(afs_wq, &net->charge_preallocation_work); | |
d001648e DH |
722 | } |
723 | ||
08e0e7c8 | 724 | /* |
372ee163 DH |
725 | * Grab the operation ID from an incoming cache manager call. The socket |
726 | * buffer is discarded on error or if we don't yet have sufficient data. | |
08e0e7c8 | 727 | */ |
d001648e | 728 | static int afs_deliver_cm_op_id(struct afs_call *call) |
08e0e7c8 | 729 | { |
d001648e | 730 | int ret; |
08e0e7c8 | 731 | |
d001648e | 732 | _enter("{%zu}", call->offset); |
08e0e7c8 DH |
733 | |
734 | ASSERTCMP(call->offset, <, 4); | |
735 | ||
736 | /* the operation ID forms the first four bytes of the request data */ | |
50a2c953 | 737 | ret = afs_extract_data(call, &call->tmp, 4, true); |
d001648e DH |
738 | if (ret < 0) |
739 | return ret; | |
08e0e7c8 | 740 | |
50a2c953 | 741 | call->operation_ID = ntohl(call->tmp); |
08e0e7c8 | 742 | call->state = AFS_CALL_AWAIT_REQUEST; |
d001648e | 743 | call->offset = 0; |
08e0e7c8 DH |
744 | |
745 | /* ask the cache manager to route the call (it'll change the call type | |
746 | * if successful) */ | |
747 | if (!afs_cm_incoming_call(call)) | |
748 | return -ENOTSUPP; | |
749 | ||
8e8d7f13 DH |
750 | trace_afs_cb_call(call); |
751 | ||
08e0e7c8 DH |
752 | /* pass responsibility for the remainer of this message off to the |
753 | * cache manager op */ | |
d001648e | 754 | return call->type->deliver(call); |
08e0e7c8 DH |
755 | } |
756 | ||
e833251a DH |
757 | /* |
758 | * Advance the AFS call state when an RxRPC service call ends the transmit | |
759 | * phase. | |
760 | */ | |
761 | static void afs_notify_end_reply_tx(struct sock *sock, | |
762 | struct rxrpc_call *rxcall, | |
763 | unsigned long call_user_ID) | |
764 | { | |
765 | struct afs_call *call = (struct afs_call *)call_user_ID; | |
766 | ||
767 | if (call->state == AFS_CALL_REPLYING) | |
768 | call->state = AFS_CALL_AWAIT_ACK; | |
769 | } | |
770 | ||
08e0e7c8 DH |
771 | /* |
772 | * send an empty reply | |
773 | */ | |
774 | void afs_send_empty_reply(struct afs_call *call) | |
775 | { | |
f044c884 | 776 | struct afs_net *net = call->net; |
08e0e7c8 | 777 | struct msghdr msg; |
08e0e7c8 DH |
778 | |
779 | _enter(""); | |
780 | ||
f044c884 | 781 | rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0); |
e754eba6 | 782 | |
08e0e7c8 DH |
783 | msg.msg_name = NULL; |
784 | msg.msg_namelen = 0; | |
bfd4e956 | 785 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
786 | msg.msg_control = NULL; |
787 | msg.msg_controllen = 0; | |
788 | msg.msg_flags = 0; | |
789 | ||
790 | call->state = AFS_CALL_AWAIT_ACK; | |
f044c884 | 791 | switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0, |
e833251a | 792 | afs_notify_end_reply_tx)) { |
08e0e7c8 DH |
793 | case 0: |
794 | _leave(" [replied]"); | |
795 | return; | |
796 | ||
797 | case -ENOMEM: | |
798 | _debug("oom"); | |
f044c884 | 799 | rxrpc_kernel_abort_call(net->socket, call->rxcall, |
3a92789a | 800 | RX_USER_ABORT, -ENOMEM, "KOO"); |
08e0e7c8 | 801 | default: |
08e0e7c8 DH |
802 | _leave(" [error]"); |
803 | return; | |
804 | } | |
805 | } | |
806 | ||
b908fe6b DH |
807 | /* |
808 | * send a simple reply | |
809 | */ | |
810 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
811 | { | |
f044c884 | 812 | struct afs_net *net = call->net; |
b908fe6b | 813 | struct msghdr msg; |
2e90b1c4 | 814 | struct kvec iov[1]; |
bd6dc742 | 815 | int n; |
b908fe6b DH |
816 | |
817 | _enter(""); | |
818 | ||
f044c884 | 819 | rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len); |
e754eba6 | 820 | |
b908fe6b DH |
821 | iov[0].iov_base = (void *) buf; |
822 | iov[0].iov_len = len; | |
823 | msg.msg_name = NULL; | |
824 | msg.msg_namelen = 0; | |
2e90b1c4 | 825 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
826 | msg.msg_control = NULL; |
827 | msg.msg_controllen = 0; | |
828 | msg.msg_flags = 0; | |
829 | ||
830 | call->state = AFS_CALL_AWAIT_ACK; | |
f044c884 | 831 | n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len, |
e833251a | 832 | afs_notify_end_reply_tx); |
bd6dc742 | 833 | if (n >= 0) { |
6c67c7c3 | 834 | /* Success */ |
b908fe6b DH |
835 | _leave(" [replied]"); |
836 | return; | |
bd6dc742 | 837 | } |
6c67c7c3 | 838 | |
bd6dc742 | 839 | if (n == -ENOMEM) { |
b908fe6b | 840 | _debug("oom"); |
f044c884 | 841 | rxrpc_kernel_abort_call(net->socket, call->rxcall, |
3a92789a | 842 | RX_USER_ABORT, -ENOMEM, "KOO"); |
b908fe6b | 843 | } |
bd6dc742 | 844 | _leave(" [error]"); |
b908fe6b DH |
845 | } |
846 | ||
08e0e7c8 | 847 | /* |
372ee163 | 848 | * Extract a piece of data from the received data socket buffers. |
08e0e7c8 | 849 | */ |
d001648e DH |
850 | int afs_extract_data(struct afs_call *call, void *buf, size_t count, |
851 | bool want_more) | |
08e0e7c8 | 852 | { |
f044c884 | 853 | struct afs_net *net = call->net; |
d001648e | 854 | int ret; |
08e0e7c8 | 855 | |
d001648e DH |
856 | _enter("{%s,%zu},,%zu,%d", |
857 | call->type->name, call->offset, count, want_more); | |
08e0e7c8 | 858 | |
d001648e | 859 | ASSERTCMP(call->offset, <=, count); |
08e0e7c8 | 860 | |
f044c884 | 861 | ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, |
d001648e | 862 | buf, count, &call->offset, |
a68f4a27 DH |
863 | want_more, &call->abort_code, |
864 | &call->service_id); | |
8e8d7f13 | 865 | trace_afs_recv_data(call, count, call->offset, want_more, ret); |
d001648e DH |
866 | if (ret == 0 || ret == -EAGAIN) |
867 | return ret; | |
08e0e7c8 | 868 | |
d001648e DH |
869 | if (ret == 1) { |
870 | switch (call->state) { | |
871 | case AFS_CALL_AWAIT_REPLY: | |
872 | call->state = AFS_CALL_COMPLETE; | |
873 | break; | |
874 | case AFS_CALL_AWAIT_REQUEST: | |
875 | call->state = AFS_CALL_REPLYING; | |
876 | break; | |
877 | default: | |
878 | break; | |
879 | } | |
880 | return 0; | |
08e0e7c8 | 881 | } |
d001648e DH |
882 | |
883 | if (ret == -ECONNABORTED) | |
f780c8ea | 884 | call->error = afs_abort_to_error(call->abort_code); |
d001648e DH |
885 | else |
886 | call->error = ret; | |
887 | call->state = AFS_CALL_COMPLETE; | |
888 | return ret; | |
08e0e7c8 | 889 | } |