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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 | ||
8324f0bc | 20 | struct socket *afs_socket; /* my RxRPC socket */ |
08e0e7c8 | 21 | static struct workqueue_struct *afs_async_calls; |
00e90712 | 22 | static struct afs_call *afs_spare_incoming_call; |
341f741f | 23 | atomic_t afs_outstanding_calls; |
08e0e7c8 | 24 | |
d001648e | 25 | static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long); |
08e0e7c8 | 26 | static int afs_wait_for_call_to_complete(struct afs_call *); |
d001648e | 27 | static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long); |
d001648e | 28 | static void afs_process_async_call(struct work_struct *); |
00e90712 DH |
29 | static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long); |
30 | static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long); | |
d001648e | 31 | static int afs_deliver_cm_op_id(struct afs_call *); |
08e0e7c8 | 32 | |
08e0e7c8 DH |
33 | /* asynchronous incoming call initial processing */ |
34 | static const struct afs_call_type afs_RXCMxxxx = { | |
00d3b7a4 | 35 | .name = "CB.xxxx", |
08e0e7c8 DH |
36 | .deliver = afs_deliver_cm_op_id, |
37 | .abort_to_error = afs_abort_to_error, | |
38 | }; | |
39 | ||
00e90712 | 40 | static void afs_charge_preallocation(struct work_struct *); |
08e0e7c8 | 41 | |
00e90712 | 42 | static DECLARE_WORK(afs_charge_preallocation_work, afs_charge_preallocation); |
08e0e7c8 | 43 | |
2f02f7ae DH |
44 | static int afs_wait_atomic_t(atomic_t *p) |
45 | { | |
46 | schedule(); | |
47 | return 0; | |
48 | } | |
49 | ||
08e0e7c8 DH |
50 | /* |
51 | * open an RxRPC socket and bind it to be a server for callback notifications | |
52 | * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT | |
53 | */ | |
54 | int afs_open_socket(void) | |
55 | { | |
56 | struct sockaddr_rxrpc srx; | |
57 | struct socket *socket; | |
58 | int ret; | |
59 | ||
60 | _enter(""); | |
61 | ||
0e119b41 | 62 | ret = -ENOMEM; |
69ad052a | 63 | afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0); |
0e119b41 DH |
64 | if (!afs_async_calls) |
65 | goto error_0; | |
08e0e7c8 | 66 | |
eeb1bd5c | 67 | ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket); |
0e119b41 DH |
68 | if (ret < 0) |
69 | goto error_1; | |
08e0e7c8 DH |
70 | |
71 | socket->sk->sk_allocation = GFP_NOFS; | |
72 | ||
73 | /* bind the callback manager's address to make this a server socket */ | |
74 | srx.srx_family = AF_RXRPC; | |
75 | srx.srx_service = CM_SERVICE; | |
76 | srx.transport_type = SOCK_DGRAM; | |
77 | srx.transport_len = sizeof(srx.transport.sin); | |
78 | srx.transport.sin.sin_family = AF_INET; | |
79 | srx.transport.sin.sin_port = htons(AFS_CM_PORT); | |
80 | memset(&srx.transport.sin.sin_addr, 0, | |
81 | sizeof(srx.transport.sin.sin_addr)); | |
82 | ||
83 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
0e119b41 DH |
84 | if (ret < 0) |
85 | goto error_2; | |
86 | ||
00e90712 DH |
87 | rxrpc_kernel_new_call_notification(socket, afs_rx_new_call, |
88 | afs_rx_discard_new_call); | |
d001648e | 89 | |
0e119b41 DH |
90 | ret = kernel_listen(socket, INT_MAX); |
91 | if (ret < 0) | |
92 | goto error_2; | |
08e0e7c8 | 93 | |
08e0e7c8 | 94 | afs_socket = socket; |
00e90712 | 95 | afs_charge_preallocation(NULL); |
08e0e7c8 DH |
96 | _leave(" = 0"); |
97 | return 0; | |
0e119b41 DH |
98 | |
99 | error_2: | |
100 | sock_release(socket); | |
101 | error_1: | |
102 | destroy_workqueue(afs_async_calls); | |
103 | error_0: | |
104 | _leave(" = %d", ret); | |
105 | return ret; | |
08e0e7c8 DH |
106 | } |
107 | ||
108 | /* | |
109 | * close the RxRPC socket AFS was using | |
110 | */ | |
111 | void afs_close_socket(void) | |
112 | { | |
113 | _enter(""); | |
114 | ||
341f741f DH |
115 | kernel_listen(afs_socket, 0); |
116 | flush_workqueue(afs_async_calls); | |
117 | ||
00e90712 | 118 | if (afs_spare_incoming_call) { |
341f741f | 119 | afs_put_call(afs_spare_incoming_call); |
00e90712 DH |
120 | afs_spare_incoming_call = NULL; |
121 | } | |
122 | ||
d001648e | 123 | _debug("outstanding %u", atomic_read(&afs_outstanding_calls)); |
2f02f7ae DH |
124 | wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t, |
125 | TASK_UNINTERRUPTIBLE); | |
126 | _debug("no outstanding calls"); | |
127 | ||
248f219c | 128 | kernel_sock_shutdown(afs_socket, SHUT_RDWR); |
d001648e | 129 | flush_workqueue(afs_async_calls); |
08e0e7c8 DH |
130 | sock_release(afs_socket); |
131 | ||
132 | _debug("dework"); | |
133 | destroy_workqueue(afs_async_calls); | |
134 | _leave(""); | |
135 | } | |
136 | ||
00d3b7a4 | 137 | /* |
341f741f | 138 | * Allocate a call. |
00d3b7a4 | 139 | */ |
341f741f DH |
140 | static struct afs_call *afs_alloc_call(const struct afs_call_type *type, |
141 | gfp_t gfp) | |
00d3b7a4 | 142 | { |
341f741f DH |
143 | struct afs_call *call; |
144 | int o; | |
00d3b7a4 | 145 | |
341f741f DH |
146 | call = kzalloc(sizeof(*call), gfp); |
147 | if (!call) | |
148 | return NULL; | |
00d3b7a4 | 149 | |
341f741f DH |
150 | call->type = type; |
151 | atomic_set(&call->usage, 1); | |
152 | INIT_WORK(&call->async_work, afs_process_async_call); | |
153 | init_waitqueue_head(&call->waitq); | |
2f02f7ae | 154 | |
341f741f DH |
155 | o = atomic_inc_return(&afs_outstanding_calls); |
156 | trace_afs_call(call, afs_call_trace_alloc, 1, o, | |
157 | __builtin_return_address(0)); | |
158 | return call; | |
00d3b7a4 DH |
159 | } |
160 | ||
6c67c7c3 | 161 | /* |
341f741f | 162 | * Dispose of a reference on a call. |
6c67c7c3 | 163 | */ |
341f741f | 164 | void afs_put_call(struct afs_call *call) |
6c67c7c3 | 165 | { |
341f741f DH |
166 | int n = atomic_dec_return(&call->usage); |
167 | int o = atomic_read(&afs_outstanding_calls); | |
168 | ||
169 | trace_afs_call(call, afs_call_trace_put, n + 1, o, | |
170 | __builtin_return_address(0)); | |
171 | ||
172 | ASSERTCMP(n, >=, 0); | |
173 | if (n == 0) { | |
174 | ASSERT(!work_pending(&call->async_work)); | |
175 | ASSERT(call->type->name != NULL); | |
176 | ||
177 | if (call->rxcall) { | |
178 | rxrpc_kernel_end_call(afs_socket, call->rxcall); | |
179 | call->rxcall = NULL; | |
180 | } | |
181 | if (call->type->destructor) | |
182 | call->type->destructor(call); | |
183 | ||
184 | kfree(call->request); | |
185 | kfree(call); | |
186 | ||
187 | o = atomic_dec_return(&afs_outstanding_calls); | |
188 | trace_afs_call(call, afs_call_trace_free, 0, o, | |
189 | __builtin_return_address(0)); | |
190 | if (o == 0) | |
191 | wake_up_atomic_t(&afs_outstanding_calls); | |
6c67c7c3 | 192 | } |
6cf12869 NWF |
193 | } |
194 | ||
195 | /* | |
341f741f | 196 | * Queue the call for actual work. Returns 0 unconditionally for convenience. |
6cf12869 | 197 | */ |
341f741f | 198 | int afs_queue_call_work(struct afs_call *call) |
6cf12869 | 199 | { |
341f741f DH |
200 | int u = atomic_inc_return(&call->usage); |
201 | ||
202 | trace_afs_call(call, afs_call_trace_work, u, | |
203 | atomic_read(&afs_outstanding_calls), | |
204 | __builtin_return_address(0)); | |
205 | ||
206 | INIT_WORK(&call->work, call->type->work); | |
207 | ||
208 | if (!queue_work(afs_wq, &call->work)) | |
209 | afs_put_call(call); | |
210 | return 0; | |
6c67c7c3 DH |
211 | } |
212 | ||
08e0e7c8 DH |
213 | /* |
214 | * allocate a call with flat request and reply buffers | |
215 | */ | |
216 | struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type, | |
d001648e | 217 | size_t request_size, size_t reply_max) |
08e0e7c8 DH |
218 | { |
219 | struct afs_call *call; | |
220 | ||
341f741f | 221 | call = afs_alloc_call(type, GFP_NOFS); |
08e0e7c8 DH |
222 | if (!call) |
223 | goto nomem_call; | |
224 | ||
225 | if (request_size) { | |
341f741f | 226 | call->request_size = request_size; |
08e0e7c8 DH |
227 | call->request = kmalloc(request_size, GFP_NOFS); |
228 | if (!call->request) | |
00d3b7a4 | 229 | goto nomem_free; |
08e0e7c8 DH |
230 | } |
231 | ||
d001648e | 232 | if (reply_max) { |
341f741f | 233 | call->reply_max = reply_max; |
d001648e | 234 | call->buffer = kmalloc(reply_max, GFP_NOFS); |
08e0e7c8 | 235 | if (!call->buffer) |
00d3b7a4 | 236 | goto nomem_free; |
08e0e7c8 DH |
237 | } |
238 | ||
08e0e7c8 | 239 | init_waitqueue_head(&call->waitq); |
08e0e7c8 DH |
240 | return call; |
241 | ||
00d3b7a4 | 242 | nomem_free: |
341f741f | 243 | afs_put_call(call); |
08e0e7c8 DH |
244 | nomem_call: |
245 | return NULL; | |
246 | } | |
247 | ||
248 | /* | |
249 | * clean up a call with flat buffer | |
250 | */ | |
251 | void afs_flat_call_destructor(struct afs_call *call) | |
252 | { | |
253 | _enter(""); | |
254 | ||
255 | kfree(call->request); | |
256 | call->request = NULL; | |
257 | kfree(call->buffer); | |
258 | call->buffer = NULL; | |
259 | } | |
260 | ||
2f5705a5 DH |
261 | #define AFS_BVEC_MAX 8 |
262 | ||
263 | /* | |
264 | * Load the given bvec with the next few pages. | |
265 | */ | |
266 | static void afs_load_bvec(struct afs_call *call, struct msghdr *msg, | |
267 | struct bio_vec *bv, pgoff_t first, pgoff_t last, | |
268 | unsigned offset) | |
269 | { | |
270 | struct page *pages[AFS_BVEC_MAX]; | |
271 | unsigned int nr, n, i, to, bytes = 0; | |
272 | ||
273 | nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX); | |
274 | n = find_get_pages_contig(call->mapping, first, nr, pages); | |
275 | ASSERTCMP(n, ==, nr); | |
276 | ||
277 | msg->msg_flags |= MSG_MORE; | |
278 | for (i = 0; i < nr; i++) { | |
279 | to = PAGE_SIZE; | |
280 | if (first + i >= last) { | |
281 | to = call->last_to; | |
282 | msg->msg_flags &= ~MSG_MORE; | |
283 | } | |
284 | bv[i].bv_page = pages[i]; | |
285 | bv[i].bv_len = to - offset; | |
286 | bv[i].bv_offset = offset; | |
287 | bytes += to - offset; | |
288 | offset = 0; | |
289 | } | |
290 | ||
291 | iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes); | |
292 | } | |
293 | ||
31143d5d DH |
294 | /* |
295 | * attach the data from a bunch of pages on an inode to a call | |
296 | */ | |
39c6acea | 297 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg) |
31143d5d | 298 | { |
2f5705a5 DH |
299 | struct bio_vec bv[AFS_BVEC_MAX]; |
300 | unsigned int bytes, nr, loop, offset; | |
31143d5d DH |
301 | pgoff_t first = call->first, last = call->last; |
302 | int ret; | |
303 | ||
31143d5d DH |
304 | offset = call->first_offset; |
305 | call->first_offset = 0; | |
306 | ||
307 | do { | |
2f5705a5 DH |
308 | afs_load_bvec(call, msg, bv, first, last, offset); |
309 | offset = 0; | |
310 | bytes = msg->msg_iter.count; | |
311 | nr = msg->msg_iter.nr_segs; | |
312 | ||
313 | /* Have to change the state *before* sending the last | |
314 | * packet as RxRPC might give us the reply before it | |
315 | * returns from sending the request. | |
316 | */ | |
445783d0 | 317 | if (first + nr - 1 >= last) |
2f5705a5 DH |
318 | call->state = AFS_CALL_AWAIT_REPLY; |
319 | ret = rxrpc_kernel_send_data(afs_socket, call->rxcall, | |
320 | msg, bytes); | |
321 | for (loop = 0; loop < nr; loop++) | |
322 | put_page(bv[loop].bv_page); | |
31143d5d DH |
323 | if (ret < 0) |
324 | break; | |
2f5705a5 DH |
325 | |
326 | first += nr; | |
5bbf5d39 | 327 | } while (first <= last); |
31143d5d | 328 | |
31143d5d DH |
329 | return ret; |
330 | } | |
331 | ||
08e0e7c8 DH |
332 | /* |
333 | * initiate a call | |
334 | */ | |
335 | int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp, | |
56ff9c83 | 336 | bool async) |
08e0e7c8 DH |
337 | { |
338 | struct sockaddr_rxrpc srx; | |
339 | struct rxrpc_call *rxcall; | |
340 | struct msghdr msg; | |
341 | struct kvec iov[1]; | |
70af0e3b | 342 | size_t offset; |
e754eba6 | 343 | s64 tx_total_len; |
70af0e3b | 344 | u32 abort_code; |
08e0e7c8 DH |
345 | int ret; |
346 | ||
347 | _enter("%x,{%d},", addr->s_addr, ntohs(call->port)); | |
348 | ||
00d3b7a4 DH |
349 | ASSERT(call->type != NULL); |
350 | ASSERT(call->type->name != NULL); | |
351 | ||
31143d5d DH |
352 | _debug("____MAKE %p{%s,%x} [%d]____", |
353 | call, call->type->name, key_serial(call->key), | |
354 | atomic_read(&afs_outstanding_calls)); | |
00d3b7a4 | 355 | |
56ff9c83 | 356 | call->async = async; |
08e0e7c8 DH |
357 | |
358 | memset(&srx, 0, sizeof(srx)); | |
359 | srx.srx_family = AF_RXRPC; | |
360 | srx.srx_service = call->service_id; | |
361 | srx.transport_type = SOCK_DGRAM; | |
362 | srx.transport_len = sizeof(srx.transport.sin); | |
363 | srx.transport.sin.sin_family = AF_INET; | |
364 | srx.transport.sin.sin_port = call->port; | |
365 | memcpy(&srx.transport.sin.sin_addr, addr, 4); | |
366 | ||
e754eba6 DH |
367 | /* Work out the length we're going to transmit. This is awkward for |
368 | * calls such as FS.StoreData where there's an extra injection of data | |
369 | * after the initial fixed part. | |
370 | */ | |
371 | tx_total_len = call->request_size; | |
372 | if (call->send_pages) { | |
373 | tx_total_len += call->last_to - call->first_offset; | |
374 | tx_total_len += (call->last - call->first) * PAGE_SIZE; | |
375 | } | |
376 | ||
08e0e7c8 DH |
377 | /* create a call */ |
378 | rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key, | |
e754eba6 DH |
379 | (unsigned long)call, |
380 | tx_total_len, gfp, | |
56ff9c83 DH |
381 | (async ? |
382 | afs_wake_up_async_call : | |
383 | afs_wake_up_call_waiter)); | |
00d3b7a4 | 384 | call->key = NULL; |
08e0e7c8 DH |
385 | if (IS_ERR(rxcall)) { |
386 | ret = PTR_ERR(rxcall); | |
387 | goto error_kill_call; | |
388 | } | |
389 | ||
390 | call->rxcall = rxcall; | |
391 | ||
392 | /* send the request */ | |
393 | iov[0].iov_base = call->request; | |
394 | iov[0].iov_len = call->request_size; | |
395 | ||
396 | msg.msg_name = NULL; | |
397 | msg.msg_namelen = 0; | |
2e90b1c4 | 398 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 399 | call->request_size); |
08e0e7c8 DH |
400 | msg.msg_control = NULL; |
401 | msg.msg_controllen = 0; | |
31143d5d | 402 | msg.msg_flags = (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 | 403 | |
70af0e3b DH |
404 | /* We have to change the state *before* sending the last packet as |
405 | * rxrpc might give us the reply before it returns from sending the | |
406 | * request. Further, if the send fails, we may already have been given | |
407 | * a notification and may have collected it. | |
408 | */ | |
31143d5d DH |
409 | if (!call->send_pages) |
410 | call->state = AFS_CALL_AWAIT_REPLY; | |
4de48af6 DH |
411 | ret = rxrpc_kernel_send_data(afs_socket, rxcall, |
412 | &msg, call->request_size); | |
08e0e7c8 DH |
413 | if (ret < 0) |
414 | goto error_do_abort; | |
415 | ||
31143d5d | 416 | if (call->send_pages) { |
39c6acea | 417 | ret = afs_send_pages(call, &msg); |
31143d5d DH |
418 | if (ret < 0) |
419 | goto error_do_abort; | |
420 | } | |
421 | ||
08e0e7c8 DH |
422 | /* at this point, an async call may no longer exist as it may have |
423 | * already completed */ | |
56ff9c83 DH |
424 | if (call->async) |
425 | return -EINPROGRESS; | |
426 | ||
427 | return afs_wait_for_call_to_complete(call); | |
08e0e7c8 DH |
428 | |
429 | error_do_abort: | |
70af0e3b DH |
430 | call->state = AFS_CALL_COMPLETE; |
431 | if (ret != -ECONNABORTED) { | |
432 | rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, | |
3a92789a | 433 | ret, "KSD"); |
70af0e3b DH |
434 | } else { |
435 | abort_code = 0; | |
436 | offset = 0; | |
437 | rxrpc_kernel_recv_data(afs_socket, rxcall, NULL, 0, &offset, | |
438 | false, &abort_code); | |
439 | ret = call->type->abort_to_error(abort_code); | |
440 | } | |
08e0e7c8 | 441 | error_kill_call: |
341f741f | 442 | afs_put_call(call); |
08e0e7c8 DH |
443 | _leave(" = %d", ret); |
444 | return ret; | |
445 | } | |
446 | ||
08e0e7c8 DH |
447 | /* |
448 | * deliver messages to a call | |
449 | */ | |
450 | static void afs_deliver_to_call(struct afs_call *call) | |
451 | { | |
08e0e7c8 DH |
452 | u32 abort_code; |
453 | int ret; | |
454 | ||
d001648e DH |
455 | _enter("%s", call->type->name); |
456 | ||
457 | while (call->state == AFS_CALL_AWAIT_REPLY || | |
458 | call->state == AFS_CALL_AWAIT_OP_ID || | |
459 | call->state == AFS_CALL_AWAIT_REQUEST || | |
460 | call->state == AFS_CALL_AWAIT_ACK | |
461 | ) { | |
462 | if (call->state == AFS_CALL_AWAIT_ACK) { | |
463 | size_t offset = 0; | |
464 | ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, | |
465 | NULL, 0, &offset, false, | |
466 | &call->abort_code); | |
8e8d7f13 DH |
467 | trace_afs_recv_data(call, 0, offset, false, ret); |
468 | ||
d001648e DH |
469 | if (ret == -EINPROGRESS || ret == -EAGAIN) |
470 | return; | |
9008f998 | 471 | if (ret == 1 || ret < 0) { |
d001648e DH |
472 | call->state = AFS_CALL_COMPLETE; |
473 | goto done; | |
08e0e7c8 | 474 | } |
d001648e | 475 | return; |
08e0e7c8 DH |
476 | } |
477 | ||
d001648e DH |
478 | ret = call->type->deliver(call); |
479 | switch (ret) { | |
480 | case 0: | |
481 | if (call->state == AFS_CALL_AWAIT_REPLY) | |
482 | call->state = AFS_CALL_COMPLETE; | |
483 | goto done; | |
484 | case -EINPROGRESS: | |
485 | case -EAGAIN: | |
486 | goto out; | |
70af0e3b DH |
487 | case -ECONNABORTED: |
488 | goto call_complete; | |
d001648e DH |
489 | case -ENOTCONN: |
490 | abort_code = RX_CALL_DEAD; | |
491 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
3a92789a | 492 | abort_code, ret, "KNC"); |
70af0e3b | 493 | goto save_error; |
d001648e | 494 | case -ENOTSUPP: |
1157f153 | 495 | abort_code = RXGEN_OPCODE; |
d001648e | 496 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
3a92789a | 497 | abort_code, ret, "KIV"); |
70af0e3b | 498 | goto save_error; |
d001648e DH |
499 | case -ENODATA: |
500 | case -EBADMSG: | |
501 | case -EMSGSIZE: | |
502 | default: | |
503 | abort_code = RXGEN_CC_UNMARSHAL; | |
504 | if (call->state != AFS_CALL_AWAIT_REPLY) | |
505 | abort_code = RXGEN_SS_UNMARSHAL; | |
506 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, | |
3a92789a | 507 | abort_code, -EBADMSG, "KUM"); |
70af0e3b | 508 | goto save_error; |
d001648e | 509 | } |
08e0e7c8 DH |
510 | } |
511 | ||
d001648e DH |
512 | done: |
513 | if (call->state == AFS_CALL_COMPLETE && call->incoming) | |
341f741f | 514 | afs_put_call(call); |
d001648e | 515 | out: |
08e0e7c8 | 516 | _leave(""); |
d001648e DH |
517 | return; |
518 | ||
70af0e3b | 519 | save_error: |
d001648e | 520 | call->error = ret; |
70af0e3b | 521 | call_complete: |
d001648e DH |
522 | call->state = AFS_CALL_COMPLETE; |
523 | goto done; | |
08e0e7c8 DH |
524 | } |
525 | ||
526 | /* | |
527 | * wait synchronously for a call to complete | |
528 | */ | |
529 | static int afs_wait_for_call_to_complete(struct afs_call *call) | |
530 | { | |
08e0e7c8 DH |
531 | int ret; |
532 | ||
533 | DECLARE_WAITQUEUE(myself, current); | |
534 | ||
535 | _enter(""); | |
536 | ||
537 | add_wait_queue(&call->waitq, &myself); | |
538 | for (;;) { | |
539 | set_current_state(TASK_INTERRUPTIBLE); | |
540 | ||
541 | /* deliver any messages that are in the queue */ | |
d001648e DH |
542 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
543 | call->need_attention = false; | |
08e0e7c8 DH |
544 | __set_current_state(TASK_RUNNING); |
545 | afs_deliver_to_call(call); | |
546 | continue; | |
547 | } | |
548 | ||
954cd6dc DH |
549 | if (call->state == AFS_CALL_COMPLETE || |
550 | signal_pending(current)) | |
08e0e7c8 DH |
551 | break; |
552 | schedule(); | |
553 | } | |
554 | ||
555 | remove_wait_queue(&call->waitq, &myself); | |
556 | __set_current_state(TASK_RUNNING); | |
557 | ||
954cd6dc | 558 | /* Kill off the call if it's still live. */ |
08e0e7c8 | 559 | if (call->state < AFS_CALL_COMPLETE) { |
954cd6dc | 560 | _debug("call interrupted"); |
d001648e | 561 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
954cd6dc | 562 | RX_USER_ABORT, -EINTR, "KWI"); |
08e0e7c8 DH |
563 | } |
564 | ||
954cd6dc | 565 | ret = call->error; |
08e0e7c8 | 566 | _debug("call complete"); |
341f741f | 567 | afs_put_call(call); |
08e0e7c8 DH |
568 | _leave(" = %d", ret); |
569 | return ret; | |
570 | } | |
571 | ||
572 | /* | |
573 | * wake up a waiting call | |
574 | */ | |
d001648e DH |
575 | static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, |
576 | unsigned long call_user_ID) | |
08e0e7c8 | 577 | { |
d001648e DH |
578 | struct afs_call *call = (struct afs_call *)call_user_ID; |
579 | ||
580 | call->need_attention = true; | |
08e0e7c8 DH |
581 | wake_up(&call->waitq); |
582 | } | |
583 | ||
584 | /* | |
585 | * wake up an asynchronous call | |
586 | */ | |
d001648e DH |
587 | static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, |
588 | unsigned long call_user_ID) | |
08e0e7c8 | 589 | { |
d001648e | 590 | struct afs_call *call = (struct afs_call *)call_user_ID; |
341f741f | 591 | int u; |
d001648e | 592 | |
8e8d7f13 | 593 | trace_afs_notify_call(rxcall, call); |
d001648e | 594 | call->need_attention = true; |
341f741f DH |
595 | |
596 | u = __atomic_add_unless(&call->usage, 1, 0); | |
597 | if (u != 0) { | |
598 | trace_afs_call(call, afs_call_trace_wake, u, | |
599 | atomic_read(&afs_outstanding_calls), | |
600 | __builtin_return_address(0)); | |
601 | ||
602 | if (!queue_work(afs_async_calls, &call->async_work)) | |
603 | afs_put_call(call); | |
604 | } | |
08e0e7c8 DH |
605 | } |
606 | ||
08e0e7c8 | 607 | /* |
341f741f DH |
608 | * Delete an asynchronous call. The work item carries a ref to the call struct |
609 | * that we need to release. | |
08e0e7c8 | 610 | */ |
d001648e | 611 | static void afs_delete_async_call(struct work_struct *work) |
08e0e7c8 | 612 | { |
d001648e DH |
613 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
614 | ||
08e0e7c8 DH |
615 | _enter(""); |
616 | ||
341f741f | 617 | afs_put_call(call); |
08e0e7c8 DH |
618 | |
619 | _leave(""); | |
620 | } | |
621 | ||
622 | /* | |
341f741f DH |
623 | * Perform I/O processing on an asynchronous call. The work item carries a ref |
624 | * to the call struct that we either need to release or to pass on. | |
08e0e7c8 | 625 | */ |
d001648e | 626 | static void afs_process_async_call(struct work_struct *work) |
08e0e7c8 | 627 | { |
d001648e DH |
628 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
629 | ||
08e0e7c8 DH |
630 | _enter(""); |
631 | ||
d001648e DH |
632 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
633 | call->need_attention = false; | |
08e0e7c8 | 634 | afs_deliver_to_call(call); |
d001648e | 635 | } |
08e0e7c8 | 636 | |
56ff9c83 | 637 | if (call->state == AFS_CALL_COMPLETE) { |
08e0e7c8 DH |
638 | call->reply = NULL; |
639 | ||
341f741f DH |
640 | /* We have two refs to release - one from the alloc and one |
641 | * queued with the work item - and we can't just deallocate the | |
642 | * call because the work item may be queued again. | |
643 | */ | |
d001648e | 644 | call->async_work.func = afs_delete_async_call; |
341f741f DH |
645 | if (!queue_work(afs_async_calls, &call->async_work)) |
646 | afs_put_call(call); | |
08e0e7c8 DH |
647 | } |
648 | ||
341f741f | 649 | afs_put_call(call); |
08e0e7c8 DH |
650 | _leave(""); |
651 | } | |
652 | ||
00e90712 DH |
653 | static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID) |
654 | { | |
655 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
656 | ||
657 | call->rxcall = rxcall; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Charge the incoming call preallocation. | |
662 | */ | |
663 | static void afs_charge_preallocation(struct work_struct *work) | |
664 | { | |
665 | struct afs_call *call = afs_spare_incoming_call; | |
666 | ||
667 | for (;;) { | |
668 | if (!call) { | |
341f741f | 669 | call = afs_alloc_call(&afs_RXCMxxxx, GFP_KERNEL); |
00e90712 DH |
670 | if (!call) |
671 | break; | |
672 | ||
56ff9c83 | 673 | call->async = true; |
00e90712 | 674 | call->state = AFS_CALL_AWAIT_OP_ID; |
56ff9c83 | 675 | init_waitqueue_head(&call->waitq); |
00e90712 DH |
676 | } |
677 | ||
678 | if (rxrpc_kernel_charge_accept(afs_socket, | |
679 | afs_wake_up_async_call, | |
680 | afs_rx_attach, | |
681 | (unsigned long)call, | |
682 | GFP_KERNEL) < 0) | |
683 | break; | |
684 | call = NULL; | |
685 | } | |
686 | afs_spare_incoming_call = call; | |
687 | } | |
688 | ||
689 | /* | |
690 | * Discard a preallocated call when a socket is shut down. | |
691 | */ | |
692 | static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, | |
693 | unsigned long user_call_ID) | |
694 | { | |
695 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
696 | ||
00e90712 | 697 | call->rxcall = NULL; |
341f741f | 698 | afs_put_call(call); |
00e90712 DH |
699 | } |
700 | ||
d001648e DH |
701 | /* |
702 | * Notification of an incoming call. | |
703 | */ | |
00e90712 DH |
704 | static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, |
705 | unsigned long user_call_ID) | |
d001648e | 706 | { |
00e90712 | 707 | queue_work(afs_wq, &afs_charge_preallocation_work); |
d001648e DH |
708 | } |
709 | ||
08e0e7c8 | 710 | /* |
372ee163 DH |
711 | * Grab the operation ID from an incoming cache manager call. The socket |
712 | * buffer is discarded on error or if we don't yet have sufficient data. | |
08e0e7c8 | 713 | */ |
d001648e | 714 | static int afs_deliver_cm_op_id(struct afs_call *call) |
08e0e7c8 | 715 | { |
d001648e | 716 | int ret; |
08e0e7c8 | 717 | |
d001648e | 718 | _enter("{%zu}", call->offset); |
08e0e7c8 DH |
719 | |
720 | ASSERTCMP(call->offset, <, 4); | |
721 | ||
722 | /* the operation ID forms the first four bytes of the request data */ | |
50a2c953 | 723 | ret = afs_extract_data(call, &call->tmp, 4, true); |
d001648e DH |
724 | if (ret < 0) |
725 | return ret; | |
08e0e7c8 | 726 | |
50a2c953 | 727 | call->operation_ID = ntohl(call->tmp); |
08e0e7c8 | 728 | call->state = AFS_CALL_AWAIT_REQUEST; |
d001648e | 729 | call->offset = 0; |
08e0e7c8 DH |
730 | |
731 | /* ask the cache manager to route the call (it'll change the call type | |
732 | * if successful) */ | |
733 | if (!afs_cm_incoming_call(call)) | |
734 | return -ENOTSUPP; | |
735 | ||
8e8d7f13 DH |
736 | trace_afs_cb_call(call); |
737 | ||
08e0e7c8 DH |
738 | /* pass responsibility for the remainer of this message off to the |
739 | * cache manager op */ | |
d001648e | 740 | return call->type->deliver(call); |
08e0e7c8 DH |
741 | } |
742 | ||
743 | /* | |
744 | * send an empty reply | |
745 | */ | |
746 | void afs_send_empty_reply(struct afs_call *call) | |
747 | { | |
748 | struct msghdr msg; | |
08e0e7c8 DH |
749 | |
750 | _enter(""); | |
751 | ||
e754eba6 DH |
752 | rxrpc_kernel_set_tx_length(afs_socket, call->rxcall, 0); |
753 | ||
08e0e7c8 DH |
754 | msg.msg_name = NULL; |
755 | msg.msg_namelen = 0; | |
bfd4e956 | 756 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
757 | msg.msg_control = NULL; |
758 | msg.msg_controllen = 0; | |
759 | msg.msg_flags = 0; | |
760 | ||
761 | call->state = AFS_CALL_AWAIT_ACK; | |
4de48af6 | 762 | switch (rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, 0)) { |
08e0e7c8 DH |
763 | case 0: |
764 | _leave(" [replied]"); | |
765 | return; | |
766 | ||
767 | case -ENOMEM: | |
768 | _debug("oom"); | |
4de48af6 | 769 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
3a92789a | 770 | RX_USER_ABORT, -ENOMEM, "KOO"); |
08e0e7c8 | 771 | default: |
08e0e7c8 DH |
772 | _leave(" [error]"); |
773 | return; | |
774 | } | |
775 | } | |
776 | ||
b908fe6b DH |
777 | /* |
778 | * send a simple reply | |
779 | */ | |
780 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
781 | { | |
782 | struct msghdr msg; | |
2e90b1c4 | 783 | struct kvec iov[1]; |
bd6dc742 | 784 | int n; |
b908fe6b DH |
785 | |
786 | _enter(""); | |
787 | ||
e754eba6 DH |
788 | rxrpc_kernel_set_tx_length(afs_socket, call->rxcall, len); |
789 | ||
b908fe6b DH |
790 | iov[0].iov_base = (void *) buf; |
791 | iov[0].iov_len = len; | |
792 | msg.msg_name = NULL; | |
793 | msg.msg_namelen = 0; | |
2e90b1c4 | 794 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
795 | msg.msg_control = NULL; |
796 | msg.msg_controllen = 0; | |
797 | msg.msg_flags = 0; | |
798 | ||
799 | call->state = AFS_CALL_AWAIT_ACK; | |
4de48af6 | 800 | n = rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, len); |
bd6dc742 | 801 | if (n >= 0) { |
6c67c7c3 | 802 | /* Success */ |
b908fe6b DH |
803 | _leave(" [replied]"); |
804 | return; | |
bd6dc742 | 805 | } |
6c67c7c3 | 806 | |
bd6dc742 | 807 | if (n == -ENOMEM) { |
b908fe6b | 808 | _debug("oom"); |
4de48af6 | 809 | rxrpc_kernel_abort_call(afs_socket, call->rxcall, |
3a92789a | 810 | RX_USER_ABORT, -ENOMEM, "KOO"); |
b908fe6b | 811 | } |
bd6dc742 | 812 | _leave(" [error]"); |
b908fe6b DH |
813 | } |
814 | ||
08e0e7c8 | 815 | /* |
372ee163 | 816 | * Extract a piece of data from the received data socket buffers. |
08e0e7c8 | 817 | */ |
d001648e DH |
818 | int afs_extract_data(struct afs_call *call, void *buf, size_t count, |
819 | bool want_more) | |
08e0e7c8 | 820 | { |
d001648e | 821 | int ret; |
08e0e7c8 | 822 | |
d001648e DH |
823 | _enter("{%s,%zu},,%zu,%d", |
824 | call->type->name, call->offset, count, want_more); | |
08e0e7c8 | 825 | |
d001648e | 826 | ASSERTCMP(call->offset, <=, count); |
08e0e7c8 | 827 | |
d001648e DH |
828 | ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall, |
829 | buf, count, &call->offset, | |
830 | want_more, &call->abort_code); | |
8e8d7f13 | 831 | trace_afs_recv_data(call, count, call->offset, want_more, ret); |
d001648e DH |
832 | if (ret == 0 || ret == -EAGAIN) |
833 | return ret; | |
08e0e7c8 | 834 | |
d001648e DH |
835 | if (ret == 1) { |
836 | switch (call->state) { | |
837 | case AFS_CALL_AWAIT_REPLY: | |
838 | call->state = AFS_CALL_COMPLETE; | |
839 | break; | |
840 | case AFS_CALL_AWAIT_REQUEST: | |
841 | call->state = AFS_CALL_REPLYING; | |
842 | break; | |
843 | default: | |
844 | break; | |
845 | } | |
846 | return 0; | |
08e0e7c8 | 847 | } |
d001648e DH |
848 | |
849 | if (ret == -ECONNABORTED) | |
850 | call->error = call->type->abort_to_error(call->abort_code); | |
851 | else | |
852 | call->error = ret; | |
853 | call->state = AFS_CALL_COMPLETE; | |
854 | return ret; | |
08e0e7c8 | 855 | } |