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Commit | Line | Data |
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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); |
d2ddc776 | 23 | static long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *); |
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)); | |
83732ec5 MD |
64 | if (ret == -EADDRINUSE) { |
65 | srx.transport.sin6.sin6_port = 0; | |
66 | ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx)); | |
67 | } | |
0e119b41 DH |
68 | if (ret < 0) |
69 | goto error_2; | |
70 | ||
00e90712 DH |
71 | rxrpc_kernel_new_call_notification(socket, afs_rx_new_call, |
72 | afs_rx_discard_new_call); | |
d001648e | 73 | |
0e119b41 DH |
74 | ret = kernel_listen(socket, INT_MAX); |
75 | if (ret < 0) | |
76 | goto error_2; | |
08e0e7c8 | 77 | |
f044c884 DH |
78 | net->socket = socket; |
79 | afs_charge_preallocation(&net->charge_preallocation_work); | |
08e0e7c8 DH |
80 | _leave(" = 0"); |
81 | return 0; | |
0e119b41 DH |
82 | |
83 | error_2: | |
84 | sock_release(socket); | |
85 | error_1: | |
0e119b41 DH |
86 | _leave(" = %d", ret); |
87 | return ret; | |
08e0e7c8 DH |
88 | } |
89 | ||
90 | /* | |
91 | * close the RxRPC socket AFS was using | |
92 | */ | |
f044c884 | 93 | void afs_close_socket(struct afs_net *net) |
08e0e7c8 DH |
94 | { |
95 | _enter(""); | |
96 | ||
f044c884 | 97 | kernel_listen(net->socket, 0); |
341f741f DH |
98 | flush_workqueue(afs_async_calls); |
99 | ||
f044c884 DH |
100 | if (net->spare_incoming_call) { |
101 | afs_put_call(net->spare_incoming_call); | |
102 | net->spare_incoming_call = NULL; | |
00e90712 DH |
103 | } |
104 | ||
f044c884 DH |
105 | _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls)); |
106 | wait_on_atomic_t(&net->nr_outstanding_calls, atomic_t_wait, | |
2f02f7ae DH |
107 | TASK_UNINTERRUPTIBLE); |
108 | _debug("no outstanding calls"); | |
109 | ||
f044c884 | 110 | kernel_sock_shutdown(net->socket, SHUT_RDWR); |
d001648e | 111 | flush_workqueue(afs_async_calls); |
f044c884 | 112 | sock_release(net->socket); |
08e0e7c8 DH |
113 | |
114 | _debug("dework"); | |
08e0e7c8 DH |
115 | _leave(""); |
116 | } | |
117 | ||
00d3b7a4 | 118 | /* |
341f741f | 119 | * Allocate a call. |
00d3b7a4 | 120 | */ |
f044c884 DH |
121 | static struct afs_call *afs_alloc_call(struct afs_net *net, |
122 | const struct afs_call_type *type, | |
341f741f | 123 | gfp_t gfp) |
00d3b7a4 | 124 | { |
341f741f DH |
125 | struct afs_call *call; |
126 | int o; | |
00d3b7a4 | 127 | |
341f741f DH |
128 | call = kzalloc(sizeof(*call), gfp); |
129 | if (!call) | |
130 | return NULL; | |
00d3b7a4 | 131 | |
341f741f | 132 | call->type = type; |
f044c884 | 133 | call->net = net; |
341f741f DH |
134 | atomic_set(&call->usage, 1); |
135 | INIT_WORK(&call->async_work, afs_process_async_call); | |
136 | init_waitqueue_head(&call->waitq); | |
98bf40cd | 137 | spin_lock_init(&call->state_lock); |
2f02f7ae | 138 | |
f044c884 | 139 | o = atomic_inc_return(&net->nr_outstanding_calls); |
341f741f DH |
140 | trace_afs_call(call, afs_call_trace_alloc, 1, o, |
141 | __builtin_return_address(0)); | |
142 | return call; | |
00d3b7a4 DH |
143 | } |
144 | ||
6c67c7c3 | 145 | /* |
341f741f | 146 | * Dispose of a reference on a call. |
6c67c7c3 | 147 | */ |
341f741f | 148 | void afs_put_call(struct afs_call *call) |
6c67c7c3 | 149 | { |
f044c884 | 150 | struct afs_net *net = call->net; |
341f741f | 151 | int n = atomic_dec_return(&call->usage); |
f044c884 | 152 | int o = atomic_read(&net->nr_outstanding_calls); |
341f741f DH |
153 | |
154 | trace_afs_call(call, afs_call_trace_put, n + 1, o, | |
155 | __builtin_return_address(0)); | |
156 | ||
157 | ASSERTCMP(n, >=, 0); | |
158 | if (n == 0) { | |
159 | ASSERT(!work_pending(&call->async_work)); | |
160 | ASSERT(call->type->name != NULL); | |
161 | ||
162 | if (call->rxcall) { | |
f044c884 | 163 | rxrpc_kernel_end_call(net->socket, call->rxcall); |
341f741f DH |
164 | call->rxcall = NULL; |
165 | } | |
166 | if (call->type->destructor) | |
167 | call->type->destructor(call); | |
168 | ||
d0676a16 | 169 | afs_put_server(call->net, call->cm_server); |
d2ddc776 | 170 | afs_put_cb_interest(call->net, call->cbi); |
341f741f DH |
171 | kfree(call->request); |
172 | kfree(call); | |
173 | ||
f044c884 | 174 | o = atomic_dec_return(&net->nr_outstanding_calls); |
341f741f DH |
175 | trace_afs_call(call, afs_call_trace_free, 0, o, |
176 | __builtin_return_address(0)); | |
177 | if (o == 0) | |
f044c884 | 178 | wake_up_atomic_t(&net->nr_outstanding_calls); |
6c67c7c3 | 179 | } |
6cf12869 NWF |
180 | } |
181 | ||
182 | /* | |
341f741f | 183 | * Queue the call for actual work. Returns 0 unconditionally for convenience. |
6cf12869 | 184 | */ |
341f741f | 185 | int afs_queue_call_work(struct afs_call *call) |
6cf12869 | 186 | { |
341f741f DH |
187 | int u = atomic_inc_return(&call->usage); |
188 | ||
189 | trace_afs_call(call, afs_call_trace_work, u, | |
f044c884 | 190 | atomic_read(&call->net->nr_outstanding_calls), |
341f741f DH |
191 | __builtin_return_address(0)); |
192 | ||
193 | INIT_WORK(&call->work, call->type->work); | |
194 | ||
195 | if (!queue_work(afs_wq, &call->work)) | |
196 | afs_put_call(call); | |
197 | return 0; | |
6c67c7c3 DH |
198 | } |
199 | ||
08e0e7c8 DH |
200 | /* |
201 | * allocate a call with flat request and reply buffers | |
202 | */ | |
f044c884 DH |
203 | struct afs_call *afs_alloc_flat_call(struct afs_net *net, |
204 | const struct afs_call_type *type, | |
d001648e | 205 | size_t request_size, size_t reply_max) |
08e0e7c8 DH |
206 | { |
207 | struct afs_call *call; | |
208 | ||
f044c884 | 209 | call = afs_alloc_call(net, type, GFP_NOFS); |
08e0e7c8 DH |
210 | if (!call) |
211 | goto nomem_call; | |
212 | ||
213 | if (request_size) { | |
341f741f | 214 | call->request_size = request_size; |
08e0e7c8 DH |
215 | call->request = kmalloc(request_size, GFP_NOFS); |
216 | if (!call->request) | |
00d3b7a4 | 217 | goto nomem_free; |
08e0e7c8 DH |
218 | } |
219 | ||
d001648e | 220 | if (reply_max) { |
341f741f | 221 | call->reply_max = reply_max; |
d001648e | 222 | call->buffer = kmalloc(reply_max, GFP_NOFS); |
08e0e7c8 | 223 | if (!call->buffer) |
00d3b7a4 | 224 | goto nomem_free; |
08e0e7c8 DH |
225 | } |
226 | ||
025db80c | 227 | call->operation_ID = type->op; |
08e0e7c8 | 228 | init_waitqueue_head(&call->waitq); |
08e0e7c8 DH |
229 | return call; |
230 | ||
00d3b7a4 | 231 | nomem_free: |
341f741f | 232 | afs_put_call(call); |
08e0e7c8 DH |
233 | nomem_call: |
234 | return NULL; | |
235 | } | |
236 | ||
237 | /* | |
238 | * clean up a call with flat buffer | |
239 | */ | |
240 | void afs_flat_call_destructor(struct afs_call *call) | |
241 | { | |
242 | _enter(""); | |
243 | ||
244 | kfree(call->request); | |
245 | call->request = NULL; | |
246 | kfree(call->buffer); | |
247 | call->buffer = NULL; | |
248 | } | |
249 | ||
2f5705a5 DH |
250 | #define AFS_BVEC_MAX 8 |
251 | ||
252 | /* | |
253 | * Load the given bvec with the next few pages. | |
254 | */ | |
255 | static void afs_load_bvec(struct afs_call *call, struct msghdr *msg, | |
256 | struct bio_vec *bv, pgoff_t first, pgoff_t last, | |
257 | unsigned offset) | |
258 | { | |
259 | struct page *pages[AFS_BVEC_MAX]; | |
260 | unsigned int nr, n, i, to, bytes = 0; | |
261 | ||
262 | nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX); | |
263 | n = find_get_pages_contig(call->mapping, first, nr, pages); | |
264 | ASSERTCMP(n, ==, nr); | |
265 | ||
266 | msg->msg_flags |= MSG_MORE; | |
267 | for (i = 0; i < nr; i++) { | |
268 | to = PAGE_SIZE; | |
269 | if (first + i >= last) { | |
270 | to = call->last_to; | |
271 | msg->msg_flags &= ~MSG_MORE; | |
272 | } | |
273 | bv[i].bv_page = pages[i]; | |
274 | bv[i].bv_len = to - offset; | |
275 | bv[i].bv_offset = offset; | |
276 | bytes += to - offset; | |
277 | offset = 0; | |
278 | } | |
279 | ||
280 | iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes); | |
281 | } | |
282 | ||
e833251a DH |
283 | /* |
284 | * Advance the AFS call state when the RxRPC call ends the transmit phase. | |
285 | */ | |
286 | static void afs_notify_end_request_tx(struct sock *sock, | |
287 | struct rxrpc_call *rxcall, | |
288 | unsigned long call_user_ID) | |
289 | { | |
290 | struct afs_call *call = (struct afs_call *)call_user_ID; | |
291 | ||
98bf40cd | 292 | afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY); |
e833251a DH |
293 | } |
294 | ||
31143d5d DH |
295 | /* |
296 | * attach the data from a bunch of pages on an inode to a call | |
297 | */ | |
39c6acea | 298 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg) |
31143d5d | 299 | { |
2f5705a5 DH |
300 | struct bio_vec bv[AFS_BVEC_MAX]; |
301 | unsigned int bytes, nr, loop, offset; | |
31143d5d DH |
302 | pgoff_t first = call->first, last = call->last; |
303 | int ret; | |
304 | ||
31143d5d DH |
305 | offset = call->first_offset; |
306 | call->first_offset = 0; | |
307 | ||
308 | do { | |
2f5705a5 | 309 | afs_load_bvec(call, msg, bv, first, last, offset); |
2c099014 DH |
310 | trace_afs_send_pages(call, msg, first, last, offset); |
311 | ||
2f5705a5 DH |
312 | offset = 0; |
313 | bytes = msg->msg_iter.count; | |
314 | nr = msg->msg_iter.nr_segs; | |
315 | ||
f044c884 | 316 | ret = rxrpc_kernel_send_data(call->net->socket, call->rxcall, msg, |
e833251a | 317 | bytes, afs_notify_end_request_tx); |
2f5705a5 DH |
318 | for (loop = 0; loop < nr; loop++) |
319 | put_page(bv[loop].bv_page); | |
31143d5d DH |
320 | if (ret < 0) |
321 | break; | |
2f5705a5 DH |
322 | |
323 | first += nr; | |
5bbf5d39 | 324 | } while (first <= last); |
31143d5d | 325 | |
2c099014 | 326 | trace_afs_sent_pages(call, call->first, last, first, ret); |
31143d5d DH |
327 | return ret; |
328 | } | |
329 | ||
08e0e7c8 DH |
330 | /* |
331 | * initiate a call | |
332 | */ | |
8b2a464c | 333 | long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, |
33cd7f2b | 334 | gfp_t gfp, bool async) |
08e0e7c8 | 335 | { |
8b2a464c | 336 | struct sockaddr_rxrpc *srx = ac->addr; |
08e0e7c8 DH |
337 | struct rxrpc_call *rxcall; |
338 | struct msghdr msg; | |
339 | struct kvec iov[1]; | |
70af0e3b | 340 | size_t offset; |
e754eba6 | 341 | s64 tx_total_len; |
08e0e7c8 DH |
342 | int ret; |
343 | ||
4d9df986 | 344 | _enter(",{%pISp},", &srx->transport); |
08e0e7c8 | 345 | |
00d3b7a4 DH |
346 | ASSERT(call->type != NULL); |
347 | ASSERT(call->type->name != NULL); | |
348 | ||
31143d5d DH |
349 | _debug("____MAKE %p{%s,%x} [%d]____", |
350 | call, call->type->name, key_serial(call->key), | |
f044c884 | 351 | atomic_read(&call->net->nr_outstanding_calls)); |
00d3b7a4 | 352 | |
56ff9c83 | 353 | call->async = async; |
08e0e7c8 | 354 | |
e754eba6 DH |
355 | /* Work out the length we're going to transmit. This is awkward for |
356 | * calls such as FS.StoreData where there's an extra injection of data | |
357 | * after the initial fixed part. | |
358 | */ | |
359 | tx_total_len = call->request_size; | |
360 | if (call->send_pages) { | |
1199db60 DH |
361 | if (call->last == call->first) { |
362 | tx_total_len += call->last_to - call->first_offset; | |
363 | } else { | |
364 | /* It looks mathematically like you should be able to | |
365 | * combine the following lines with the ones above, but | |
366 | * unsigned arithmetic is fun when it wraps... | |
367 | */ | |
368 | tx_total_len += PAGE_SIZE - call->first_offset; | |
369 | tx_total_len += call->last_to; | |
370 | tx_total_len += (call->last - call->first - 1) * PAGE_SIZE; | |
371 | } | |
e754eba6 DH |
372 | } |
373 | ||
08e0e7c8 | 374 | /* create a call */ |
4d9df986 | 375 | rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key, |
e754eba6 DH |
376 | (unsigned long)call, |
377 | tx_total_len, gfp, | |
56ff9c83 DH |
378 | (async ? |
379 | afs_wake_up_async_call : | |
a68f4a27 DH |
380 | afs_wake_up_call_waiter), |
381 | call->upgrade); | |
08e0e7c8 DH |
382 | if (IS_ERR(rxcall)) { |
383 | ret = PTR_ERR(rxcall); | |
384 | goto error_kill_call; | |
385 | } | |
386 | ||
387 | call->rxcall = rxcall; | |
388 | ||
389 | /* send the request */ | |
390 | iov[0].iov_base = call->request; | |
391 | iov[0].iov_len = call->request_size; | |
392 | ||
393 | msg.msg_name = NULL; | |
394 | msg.msg_namelen = 0; | |
2e90b1c4 | 395 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, |
c0371da6 | 396 | call->request_size); |
08e0e7c8 DH |
397 | msg.msg_control = NULL; |
398 | msg.msg_controllen = 0; | |
bc5e3a54 | 399 | msg.msg_flags = MSG_WAITALL | (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 | 400 | |
f044c884 | 401 | ret = rxrpc_kernel_send_data(call->net->socket, rxcall, |
e833251a DH |
402 | &msg, call->request_size, |
403 | afs_notify_end_request_tx); | |
08e0e7c8 DH |
404 | if (ret < 0) |
405 | goto error_do_abort; | |
406 | ||
31143d5d | 407 | if (call->send_pages) { |
39c6acea | 408 | ret = afs_send_pages(call, &msg); |
31143d5d DH |
409 | if (ret < 0) |
410 | goto error_do_abort; | |
411 | } | |
412 | ||
08e0e7c8 DH |
413 | /* at this point, an async call may no longer exist as it may have |
414 | * already completed */ | |
56ff9c83 DH |
415 | if (call->async) |
416 | return -EINPROGRESS; | |
417 | ||
d2ddc776 | 418 | return afs_wait_for_call_to_complete(call, ac); |
08e0e7c8 DH |
419 | |
420 | error_do_abort: | |
70af0e3b DH |
421 | call->state = AFS_CALL_COMPLETE; |
422 | if (ret != -ECONNABORTED) { | |
f044c884 DH |
423 | rxrpc_kernel_abort_call(call->net->socket, rxcall, |
424 | RX_USER_ABORT, ret, "KSD"); | |
70af0e3b | 425 | } else { |
70af0e3b | 426 | offset = 0; |
f044c884 | 427 | rxrpc_kernel_recv_data(call->net->socket, rxcall, NULL, |
33cd7f2b | 428 | 0, &offset, false, &call->abort_code, |
f044c884 | 429 | &call->service_id); |
d2ddc776 DH |
430 | ac->abort_code = call->abort_code; |
431 | ac->responded = true; | |
70af0e3b | 432 | } |
025db80c DH |
433 | call->error = ret; |
434 | trace_afs_call_done(call); | |
08e0e7c8 | 435 | error_kill_call: |
341f741f | 436 | afs_put_call(call); |
d2ddc776 | 437 | ac->error = ret; |
08e0e7c8 DH |
438 | _leave(" = %d", ret); |
439 | return ret; | |
440 | } | |
441 | ||
08e0e7c8 DH |
442 | /* |
443 | * deliver messages to a call | |
444 | */ | |
445 | static void afs_deliver_to_call(struct afs_call *call) | |
446 | { | |
98bf40cd DH |
447 | enum afs_call_state state; |
448 | u32 abort_code, remote_abort = 0; | |
08e0e7c8 DH |
449 | int ret; |
450 | ||
d001648e DH |
451 | _enter("%s", call->type->name); |
452 | ||
98bf40cd DH |
453 | while (state = READ_ONCE(call->state), |
454 | state == AFS_CALL_CL_AWAIT_REPLY || | |
455 | state == AFS_CALL_SV_AWAIT_OP_ID || | |
456 | state == AFS_CALL_SV_AWAIT_REQUEST || | |
457 | state == AFS_CALL_SV_AWAIT_ACK | |
d001648e | 458 | ) { |
98bf40cd | 459 | if (state == AFS_CALL_SV_AWAIT_ACK) { |
d001648e | 460 | size_t offset = 0; |
f044c884 DH |
461 | ret = rxrpc_kernel_recv_data(call->net->socket, |
462 | call->rxcall, | |
d001648e | 463 | NULL, 0, &offset, false, |
98bf40cd | 464 | &remote_abort, |
a68f4a27 | 465 | &call->service_id); |
8e8d7f13 DH |
466 | trace_afs_recv_data(call, 0, offset, false, ret); |
467 | ||
d001648e DH |
468 | if (ret == -EINPROGRESS || ret == -EAGAIN) |
469 | return; | |
98bf40cd DH |
470 | if (ret < 0 || ret == 1) { |
471 | if (ret == 1) | |
472 | ret = 0; | |
025db80c | 473 | goto call_complete; |
98bf40cd | 474 | } |
d001648e | 475 | return; |
08e0e7c8 DH |
476 | } |
477 | ||
d001648e | 478 | ret = call->type->deliver(call); |
98bf40cd | 479 | state = READ_ONCE(call->state); |
d001648e DH |
480 | switch (ret) { |
481 | case 0: | |
98bf40cd | 482 | if (state == AFS_CALL_CL_PROC_REPLY) |
025db80c | 483 | goto call_complete; |
98bf40cd | 484 | ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY); |
d001648e DH |
485 | goto done; |
486 | case -EINPROGRESS: | |
487 | case -EAGAIN: | |
488 | goto out; | |
98bf40cd | 489 | case -EIO: |
70af0e3b | 490 | case -ECONNABORTED: |
98bf40cd DH |
491 | ASSERTCMP(state, ==, AFS_CALL_COMPLETE); |
492 | goto done; | |
d001648e DH |
493 | case -ENOTCONN: |
494 | abort_code = RX_CALL_DEAD; | |
f044c884 | 495 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 496 | abort_code, ret, "KNC"); |
98bf40cd | 497 | goto local_abort; |
d001648e | 498 | case -ENOTSUPP: |
1157f153 | 499 | abort_code = RXGEN_OPCODE; |
f044c884 | 500 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 501 | abort_code, ret, "KIV"); |
98bf40cd | 502 | goto local_abort; |
d001648e DH |
503 | case -ENODATA: |
504 | case -EBADMSG: | |
505 | case -EMSGSIZE: | |
506 | default: | |
507 | abort_code = RXGEN_CC_UNMARSHAL; | |
98bf40cd | 508 | if (state != AFS_CALL_CL_AWAIT_REPLY) |
d001648e | 509 | abort_code = RXGEN_SS_UNMARSHAL; |
f044c884 | 510 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 511 | abort_code, -EBADMSG, "KUM"); |
98bf40cd | 512 | goto local_abort; |
d001648e | 513 | } |
08e0e7c8 DH |
514 | } |
515 | ||
d001648e | 516 | done: |
98bf40cd | 517 | if (state == AFS_CALL_COMPLETE && call->incoming) |
341f741f | 518 | afs_put_call(call); |
d001648e | 519 | out: |
08e0e7c8 | 520 | _leave(""); |
d001648e DH |
521 | return; |
522 | ||
98bf40cd DH |
523 | local_abort: |
524 | abort_code = 0; | |
025db80c | 525 | call_complete: |
98bf40cd DH |
526 | afs_set_call_complete(call, ret, remote_abort); |
527 | state = AFS_CALL_COMPLETE; | |
d001648e | 528 | goto done; |
08e0e7c8 DH |
529 | } |
530 | ||
531 | /* | |
532 | * wait synchronously for a call to complete | |
533 | */ | |
d2ddc776 DH |
534 | static long afs_wait_for_call_to_complete(struct afs_call *call, |
535 | struct afs_addr_cursor *ac) | |
08e0e7c8 | 536 | { |
bc5e3a54 | 537 | signed long rtt2, timeout; |
33cd7f2b | 538 | long ret; |
bc5e3a54 DH |
539 | u64 rtt; |
540 | u32 life, last_life; | |
08e0e7c8 DH |
541 | |
542 | DECLARE_WAITQUEUE(myself, current); | |
543 | ||
544 | _enter(""); | |
545 | ||
f044c884 | 546 | rtt = rxrpc_kernel_get_rtt(call->net->socket, call->rxcall); |
bc5e3a54 DH |
547 | rtt2 = nsecs_to_jiffies64(rtt) * 2; |
548 | if (rtt2 < 2) | |
549 | rtt2 = 2; | |
550 | ||
551 | timeout = rtt2; | |
f044c884 | 552 | last_life = rxrpc_kernel_check_life(call->net->socket, call->rxcall); |
bc5e3a54 | 553 | |
08e0e7c8 DH |
554 | add_wait_queue(&call->waitq, &myself); |
555 | for (;;) { | |
bc5e3a54 | 556 | set_current_state(TASK_UNINTERRUPTIBLE); |
08e0e7c8 DH |
557 | |
558 | /* deliver any messages that are in the queue */ | |
98bf40cd DH |
559 | if (!afs_check_call_state(call, AFS_CALL_COMPLETE) && |
560 | call->need_attention) { | |
d001648e | 561 | call->need_attention = false; |
08e0e7c8 DH |
562 | __set_current_state(TASK_RUNNING); |
563 | afs_deliver_to_call(call); | |
564 | continue; | |
565 | } | |
566 | ||
98bf40cd | 567 | if (afs_check_call_state(call, AFS_CALL_COMPLETE)) |
08e0e7c8 | 568 | break; |
bc5e3a54 | 569 | |
f044c884 | 570 | life = rxrpc_kernel_check_life(call->net->socket, call->rxcall); |
bc5e3a54 DH |
571 | if (timeout == 0 && |
572 | life == last_life && signal_pending(current)) | |
573 | break; | |
574 | ||
575 | if (life != last_life) { | |
576 | timeout = rtt2; | |
577 | last_life = life; | |
578 | } | |
579 | ||
580 | timeout = schedule_timeout(timeout); | |
08e0e7c8 DH |
581 | } |
582 | ||
583 | remove_wait_queue(&call->waitq, &myself); | |
584 | __set_current_state(TASK_RUNNING); | |
585 | ||
954cd6dc | 586 | /* Kill off the call if it's still live. */ |
98bf40cd | 587 | if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) { |
954cd6dc | 588 | _debug("call interrupted"); |
d2ddc776 | 589 | if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
98bf40cd DH |
590 | RX_USER_ABORT, -EINTR, "KWI")) |
591 | afs_set_call_complete(call, -EINTR, 0); | |
08e0e7c8 DH |
592 | } |
593 | ||
98bf40cd | 594 | spin_lock_bh(&call->state_lock); |
d2ddc776 DH |
595 | ac->abort_code = call->abort_code; |
596 | ac->error = call->error; | |
98bf40cd | 597 | spin_unlock_bh(&call->state_lock); |
d2ddc776 DH |
598 | |
599 | ret = ac->error; | |
600 | switch (ret) { | |
601 | case 0: | |
602 | if (call->ret_reply0) { | |
603 | ret = (long)call->reply[0]; | |
604 | call->reply[0] = NULL; | |
605 | } | |
606 | /* Fall through */ | |
607 | case -ECONNABORTED: | |
608 | ac->responded = true; | |
609 | break; | |
33cd7f2b DH |
610 | } |
611 | ||
08e0e7c8 | 612 | _debug("call complete"); |
341f741f | 613 | afs_put_call(call); |
33cd7f2b | 614 | _leave(" = %p", (void *)ret); |
08e0e7c8 DH |
615 | return ret; |
616 | } | |
617 | ||
618 | /* | |
619 | * wake up a waiting call | |
620 | */ | |
d001648e DH |
621 | static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, |
622 | unsigned long call_user_ID) | |
08e0e7c8 | 623 | { |
d001648e DH |
624 | struct afs_call *call = (struct afs_call *)call_user_ID; |
625 | ||
626 | call->need_attention = true; | |
08e0e7c8 DH |
627 | wake_up(&call->waitq); |
628 | } | |
629 | ||
630 | /* | |
631 | * wake up an asynchronous call | |
632 | */ | |
d001648e DH |
633 | static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, |
634 | unsigned long call_user_ID) | |
08e0e7c8 | 635 | { |
d001648e | 636 | struct afs_call *call = (struct afs_call *)call_user_ID; |
341f741f | 637 | int u; |
d001648e | 638 | |
8e8d7f13 | 639 | trace_afs_notify_call(rxcall, call); |
d001648e | 640 | call->need_attention = true; |
341f741f DH |
641 | |
642 | u = __atomic_add_unless(&call->usage, 1, 0); | |
643 | if (u != 0) { | |
644 | trace_afs_call(call, afs_call_trace_wake, u, | |
f044c884 | 645 | atomic_read(&call->net->nr_outstanding_calls), |
341f741f DH |
646 | __builtin_return_address(0)); |
647 | ||
648 | if (!queue_work(afs_async_calls, &call->async_work)) | |
649 | afs_put_call(call); | |
650 | } | |
08e0e7c8 DH |
651 | } |
652 | ||
08e0e7c8 | 653 | /* |
341f741f DH |
654 | * Delete an asynchronous call. The work item carries a ref to the call struct |
655 | * that we need to release. | |
08e0e7c8 | 656 | */ |
d001648e | 657 | static void afs_delete_async_call(struct work_struct *work) |
08e0e7c8 | 658 | { |
d001648e DH |
659 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
660 | ||
08e0e7c8 DH |
661 | _enter(""); |
662 | ||
341f741f | 663 | afs_put_call(call); |
08e0e7c8 DH |
664 | |
665 | _leave(""); | |
666 | } | |
667 | ||
668 | /* | |
341f741f DH |
669 | * Perform I/O processing on an asynchronous call. The work item carries a ref |
670 | * to the call struct that we either need to release or to pass on. | |
08e0e7c8 | 671 | */ |
d001648e | 672 | static void afs_process_async_call(struct work_struct *work) |
08e0e7c8 | 673 | { |
d001648e DH |
674 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
675 | ||
08e0e7c8 DH |
676 | _enter(""); |
677 | ||
d001648e DH |
678 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
679 | call->need_attention = false; | |
08e0e7c8 | 680 | afs_deliver_to_call(call); |
d001648e | 681 | } |
08e0e7c8 | 682 | |
56ff9c83 | 683 | if (call->state == AFS_CALL_COMPLETE) { |
97e3043a | 684 | call->reply[0] = NULL; |
08e0e7c8 | 685 | |
341f741f DH |
686 | /* We have two refs to release - one from the alloc and one |
687 | * queued with the work item - and we can't just deallocate the | |
688 | * call because the work item may be queued again. | |
689 | */ | |
d001648e | 690 | call->async_work.func = afs_delete_async_call; |
341f741f DH |
691 | if (!queue_work(afs_async_calls, &call->async_work)) |
692 | afs_put_call(call); | |
08e0e7c8 DH |
693 | } |
694 | ||
341f741f | 695 | afs_put_call(call); |
08e0e7c8 DH |
696 | _leave(""); |
697 | } | |
698 | ||
00e90712 DH |
699 | static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID) |
700 | { | |
701 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
702 | ||
703 | call->rxcall = rxcall; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Charge the incoming call preallocation. | |
708 | */ | |
f044c884 | 709 | void afs_charge_preallocation(struct work_struct *work) |
00e90712 | 710 | { |
f044c884 DH |
711 | struct afs_net *net = |
712 | container_of(work, struct afs_net, charge_preallocation_work); | |
713 | struct afs_call *call = net->spare_incoming_call; | |
00e90712 DH |
714 | |
715 | for (;;) { | |
716 | if (!call) { | |
f044c884 | 717 | call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL); |
00e90712 DH |
718 | if (!call) |
719 | break; | |
720 | ||
56ff9c83 | 721 | call->async = true; |
98bf40cd | 722 | call->state = AFS_CALL_SV_AWAIT_OP_ID; |
56ff9c83 | 723 | init_waitqueue_head(&call->waitq); |
00e90712 DH |
724 | } |
725 | ||
f044c884 | 726 | if (rxrpc_kernel_charge_accept(net->socket, |
00e90712 DH |
727 | afs_wake_up_async_call, |
728 | afs_rx_attach, | |
729 | (unsigned long)call, | |
730 | GFP_KERNEL) < 0) | |
731 | break; | |
732 | call = NULL; | |
733 | } | |
f044c884 | 734 | net->spare_incoming_call = call; |
00e90712 DH |
735 | } |
736 | ||
737 | /* | |
738 | * Discard a preallocated call when a socket is shut down. | |
739 | */ | |
740 | static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, | |
741 | unsigned long user_call_ID) | |
742 | { | |
743 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
744 | ||
00e90712 | 745 | call->rxcall = NULL; |
341f741f | 746 | afs_put_call(call); |
00e90712 DH |
747 | } |
748 | ||
d001648e DH |
749 | /* |
750 | * Notification of an incoming call. | |
751 | */ | |
00e90712 DH |
752 | static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, |
753 | unsigned long user_call_ID) | |
d001648e | 754 | { |
f044c884 DH |
755 | struct afs_net *net = afs_sock2net(sk); |
756 | ||
757 | queue_work(afs_wq, &net->charge_preallocation_work); | |
d001648e DH |
758 | } |
759 | ||
08e0e7c8 | 760 | /* |
372ee163 DH |
761 | * Grab the operation ID from an incoming cache manager call. The socket |
762 | * buffer is discarded on error or if we don't yet have sufficient data. | |
08e0e7c8 | 763 | */ |
d001648e | 764 | static int afs_deliver_cm_op_id(struct afs_call *call) |
08e0e7c8 | 765 | { |
d001648e | 766 | int ret; |
08e0e7c8 | 767 | |
d001648e | 768 | _enter("{%zu}", call->offset); |
08e0e7c8 DH |
769 | |
770 | ASSERTCMP(call->offset, <, 4); | |
771 | ||
772 | /* the operation ID forms the first four bytes of the request data */ | |
50a2c953 | 773 | ret = afs_extract_data(call, &call->tmp, 4, true); |
d001648e DH |
774 | if (ret < 0) |
775 | return ret; | |
08e0e7c8 | 776 | |
50a2c953 | 777 | call->operation_ID = ntohl(call->tmp); |
98bf40cd | 778 | afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST); |
d001648e | 779 | call->offset = 0; |
08e0e7c8 DH |
780 | |
781 | /* ask the cache manager to route the call (it'll change the call type | |
782 | * if successful) */ | |
783 | if (!afs_cm_incoming_call(call)) | |
784 | return -ENOTSUPP; | |
785 | ||
8e8d7f13 DH |
786 | trace_afs_cb_call(call); |
787 | ||
08e0e7c8 DH |
788 | /* pass responsibility for the remainer of this message off to the |
789 | * cache manager op */ | |
d001648e | 790 | return call->type->deliver(call); |
08e0e7c8 DH |
791 | } |
792 | ||
e833251a DH |
793 | /* |
794 | * Advance the AFS call state when an RxRPC service call ends the transmit | |
795 | * phase. | |
796 | */ | |
797 | static void afs_notify_end_reply_tx(struct sock *sock, | |
798 | struct rxrpc_call *rxcall, | |
799 | unsigned long call_user_ID) | |
800 | { | |
801 | struct afs_call *call = (struct afs_call *)call_user_ID; | |
802 | ||
98bf40cd | 803 | afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK); |
e833251a DH |
804 | } |
805 | ||
08e0e7c8 DH |
806 | /* |
807 | * send an empty reply | |
808 | */ | |
809 | void afs_send_empty_reply(struct afs_call *call) | |
810 | { | |
f044c884 | 811 | struct afs_net *net = call->net; |
08e0e7c8 | 812 | struct msghdr msg; |
08e0e7c8 DH |
813 | |
814 | _enter(""); | |
815 | ||
f044c884 | 816 | rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0); |
e754eba6 | 817 | |
08e0e7c8 DH |
818 | msg.msg_name = NULL; |
819 | msg.msg_namelen = 0; | |
bfd4e956 | 820 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
821 | msg.msg_control = NULL; |
822 | msg.msg_controllen = 0; | |
823 | msg.msg_flags = 0; | |
824 | ||
f044c884 | 825 | switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0, |
e833251a | 826 | afs_notify_end_reply_tx)) { |
08e0e7c8 DH |
827 | case 0: |
828 | _leave(" [replied]"); | |
829 | return; | |
830 | ||
831 | case -ENOMEM: | |
832 | _debug("oom"); | |
f044c884 | 833 | rxrpc_kernel_abort_call(net->socket, call->rxcall, |
3a92789a | 834 | RX_USER_ABORT, -ENOMEM, "KOO"); |
08e0e7c8 | 835 | default: |
08e0e7c8 DH |
836 | _leave(" [error]"); |
837 | return; | |
838 | } | |
839 | } | |
840 | ||
b908fe6b DH |
841 | /* |
842 | * send a simple reply | |
843 | */ | |
844 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
845 | { | |
f044c884 | 846 | struct afs_net *net = call->net; |
b908fe6b | 847 | struct msghdr msg; |
2e90b1c4 | 848 | struct kvec iov[1]; |
bd6dc742 | 849 | int n; |
b908fe6b DH |
850 | |
851 | _enter(""); | |
852 | ||
f044c884 | 853 | rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len); |
e754eba6 | 854 | |
b908fe6b DH |
855 | iov[0].iov_base = (void *) buf; |
856 | iov[0].iov_len = len; | |
857 | msg.msg_name = NULL; | |
858 | msg.msg_namelen = 0; | |
2e90b1c4 | 859 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
860 | msg.msg_control = NULL; |
861 | msg.msg_controllen = 0; | |
862 | msg.msg_flags = 0; | |
863 | ||
f044c884 | 864 | n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len, |
e833251a | 865 | afs_notify_end_reply_tx); |
bd6dc742 | 866 | if (n >= 0) { |
6c67c7c3 | 867 | /* Success */ |
b908fe6b DH |
868 | _leave(" [replied]"); |
869 | return; | |
bd6dc742 | 870 | } |
6c67c7c3 | 871 | |
bd6dc742 | 872 | if (n == -ENOMEM) { |
b908fe6b | 873 | _debug("oom"); |
f044c884 | 874 | rxrpc_kernel_abort_call(net->socket, call->rxcall, |
3a92789a | 875 | RX_USER_ABORT, -ENOMEM, "KOO"); |
b908fe6b | 876 | } |
bd6dc742 | 877 | _leave(" [error]"); |
b908fe6b DH |
878 | } |
879 | ||
08e0e7c8 | 880 | /* |
372ee163 | 881 | * Extract a piece of data from the received data socket buffers. |
08e0e7c8 | 882 | */ |
d001648e DH |
883 | int afs_extract_data(struct afs_call *call, void *buf, size_t count, |
884 | bool want_more) | |
08e0e7c8 | 885 | { |
f044c884 | 886 | struct afs_net *net = call->net; |
98bf40cd DH |
887 | enum afs_call_state state; |
888 | u32 remote_abort; | |
d001648e | 889 | int ret; |
08e0e7c8 | 890 | |
d001648e DH |
891 | _enter("{%s,%zu},,%zu,%d", |
892 | call->type->name, call->offset, count, want_more); | |
08e0e7c8 | 893 | |
d001648e | 894 | ASSERTCMP(call->offset, <=, count); |
08e0e7c8 | 895 | |
f044c884 | 896 | ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, |
d001648e | 897 | buf, count, &call->offset, |
98bf40cd | 898 | want_more, &remote_abort, |
a68f4a27 | 899 | &call->service_id); |
8e8d7f13 | 900 | trace_afs_recv_data(call, count, call->offset, want_more, ret); |
d001648e DH |
901 | if (ret == 0 || ret == -EAGAIN) |
902 | return ret; | |
08e0e7c8 | 903 | |
98bf40cd | 904 | state = READ_ONCE(call->state); |
d001648e | 905 | if (ret == 1) { |
98bf40cd DH |
906 | switch (state) { |
907 | case AFS_CALL_CL_AWAIT_REPLY: | |
908 | afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY); | |
d001648e | 909 | break; |
98bf40cd DH |
910 | case AFS_CALL_SV_AWAIT_REQUEST: |
911 | afs_set_call_state(call, state, AFS_CALL_SV_REPLYING); | |
d001648e | 912 | break; |
98bf40cd DH |
913 | case AFS_CALL_COMPLETE: |
914 | kdebug("prem complete %d", call->error); | |
915 | return -EIO; | |
d001648e DH |
916 | default: |
917 | break; | |
918 | } | |
919 | return 0; | |
08e0e7c8 | 920 | } |
d001648e | 921 | |
98bf40cd | 922 | afs_set_call_complete(call, ret, remote_abort); |
d001648e | 923 | return ret; |
08e0e7c8 | 924 | } |