]>
Commit | Line | Data |
---|---|---|
08e0e7c8 DH |
1 | /* Maintain an RxRPC server socket to do AFS communications through |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
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; |
a25e21f0 | 134 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); |
341f741f DH |
135 | atomic_set(&call->usage, 1); |
136 | INIT_WORK(&call->async_work, afs_process_async_call); | |
137 | init_waitqueue_head(&call->waitq); | |
98bf40cd | 138 | spin_lock_init(&call->state_lock); |
2f02f7ae | 139 | |
f044c884 | 140 | o = atomic_inc_return(&net->nr_outstanding_calls); |
341f741f DH |
141 | trace_afs_call(call, afs_call_trace_alloc, 1, o, |
142 | __builtin_return_address(0)); | |
143 | return call; | |
00d3b7a4 DH |
144 | } |
145 | ||
6c67c7c3 | 146 | /* |
341f741f | 147 | * Dispose of a reference on a call. |
6c67c7c3 | 148 | */ |
341f741f | 149 | void afs_put_call(struct afs_call *call) |
6c67c7c3 | 150 | { |
f044c884 | 151 | struct afs_net *net = call->net; |
341f741f | 152 | int n = atomic_dec_return(&call->usage); |
f044c884 | 153 | int o = atomic_read(&net->nr_outstanding_calls); |
341f741f DH |
154 | |
155 | trace_afs_call(call, afs_call_trace_put, n + 1, o, | |
156 | __builtin_return_address(0)); | |
157 | ||
158 | ASSERTCMP(n, >=, 0); | |
159 | if (n == 0) { | |
160 | ASSERT(!work_pending(&call->async_work)); | |
161 | ASSERT(call->type->name != NULL); | |
162 | ||
163 | if (call->rxcall) { | |
f044c884 | 164 | rxrpc_kernel_end_call(net->socket, call->rxcall); |
341f741f DH |
165 | call->rxcall = NULL; |
166 | } | |
167 | if (call->type->destructor) | |
168 | call->type->destructor(call); | |
169 | ||
d0676a16 | 170 | afs_put_server(call->net, call->cm_server); |
d2ddc776 | 171 | afs_put_cb_interest(call->net, call->cbi); |
341f741f | 172 | kfree(call->request); |
341f741f | 173 | |
341f741f DH |
174 | trace_afs_call(call, afs_call_trace_free, 0, o, |
175 | __builtin_return_address(0)); | |
a25e21f0 DH |
176 | kfree(call); |
177 | ||
178 | o = atomic_dec_return(&net->nr_outstanding_calls); | |
341f741f | 179 | if (o == 0) |
f044c884 | 180 | wake_up_atomic_t(&net->nr_outstanding_calls); |
6c67c7c3 | 181 | } |
6cf12869 NWF |
182 | } |
183 | ||
184 | /* | |
341f741f | 185 | * Queue the call for actual work. Returns 0 unconditionally for convenience. |
6cf12869 | 186 | */ |
341f741f | 187 | int afs_queue_call_work(struct afs_call *call) |
6cf12869 | 188 | { |
341f741f DH |
189 | int u = atomic_inc_return(&call->usage); |
190 | ||
191 | trace_afs_call(call, afs_call_trace_work, u, | |
f044c884 | 192 | atomic_read(&call->net->nr_outstanding_calls), |
341f741f DH |
193 | __builtin_return_address(0)); |
194 | ||
195 | INIT_WORK(&call->work, call->type->work); | |
196 | ||
197 | if (!queue_work(afs_wq, &call->work)) | |
198 | afs_put_call(call); | |
199 | return 0; | |
6c67c7c3 DH |
200 | } |
201 | ||
08e0e7c8 DH |
202 | /* |
203 | * allocate a call with flat request and reply buffers | |
204 | */ | |
f044c884 DH |
205 | struct afs_call *afs_alloc_flat_call(struct afs_net *net, |
206 | const struct afs_call_type *type, | |
d001648e | 207 | size_t request_size, size_t reply_max) |
08e0e7c8 DH |
208 | { |
209 | struct afs_call *call; | |
210 | ||
f044c884 | 211 | call = afs_alloc_call(net, type, GFP_NOFS); |
08e0e7c8 DH |
212 | if (!call) |
213 | goto nomem_call; | |
214 | ||
215 | if (request_size) { | |
341f741f | 216 | call->request_size = request_size; |
08e0e7c8 DH |
217 | call->request = kmalloc(request_size, GFP_NOFS); |
218 | if (!call->request) | |
00d3b7a4 | 219 | goto nomem_free; |
08e0e7c8 DH |
220 | } |
221 | ||
d001648e | 222 | if (reply_max) { |
341f741f | 223 | call->reply_max = reply_max; |
d001648e | 224 | call->buffer = kmalloc(reply_max, GFP_NOFS); |
08e0e7c8 | 225 | if (!call->buffer) |
00d3b7a4 | 226 | goto nomem_free; |
08e0e7c8 DH |
227 | } |
228 | ||
025db80c | 229 | call->operation_ID = type->op; |
08e0e7c8 | 230 | init_waitqueue_head(&call->waitq); |
08e0e7c8 DH |
231 | return call; |
232 | ||
00d3b7a4 | 233 | nomem_free: |
341f741f | 234 | afs_put_call(call); |
08e0e7c8 DH |
235 | nomem_call: |
236 | return NULL; | |
237 | } | |
238 | ||
239 | /* | |
240 | * clean up a call with flat buffer | |
241 | */ | |
242 | void afs_flat_call_destructor(struct afs_call *call) | |
243 | { | |
244 | _enter(""); | |
245 | ||
246 | kfree(call->request); | |
247 | call->request = NULL; | |
248 | kfree(call->buffer); | |
249 | call->buffer = NULL; | |
250 | } | |
251 | ||
2f5705a5 DH |
252 | #define AFS_BVEC_MAX 8 |
253 | ||
254 | /* | |
255 | * Load the given bvec with the next few pages. | |
256 | */ | |
257 | static void afs_load_bvec(struct afs_call *call, struct msghdr *msg, | |
258 | struct bio_vec *bv, pgoff_t first, pgoff_t last, | |
259 | unsigned offset) | |
260 | { | |
261 | struct page *pages[AFS_BVEC_MAX]; | |
262 | unsigned int nr, n, i, to, bytes = 0; | |
263 | ||
264 | nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX); | |
265 | n = find_get_pages_contig(call->mapping, first, nr, pages); | |
266 | ASSERTCMP(n, ==, nr); | |
267 | ||
268 | msg->msg_flags |= MSG_MORE; | |
269 | for (i = 0; i < nr; i++) { | |
270 | to = PAGE_SIZE; | |
271 | if (first + i >= last) { | |
272 | to = call->last_to; | |
273 | msg->msg_flags &= ~MSG_MORE; | |
274 | } | |
275 | bv[i].bv_page = pages[i]; | |
276 | bv[i].bv_len = to - offset; | |
277 | bv[i].bv_offset = offset; | |
278 | bytes += to - offset; | |
279 | offset = 0; | |
280 | } | |
281 | ||
282 | iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes); | |
283 | } | |
284 | ||
e833251a DH |
285 | /* |
286 | * Advance the AFS call state when the RxRPC call ends the transmit phase. | |
287 | */ | |
288 | static void afs_notify_end_request_tx(struct sock *sock, | |
289 | struct rxrpc_call *rxcall, | |
290 | unsigned long call_user_ID) | |
291 | { | |
292 | struct afs_call *call = (struct afs_call *)call_user_ID; | |
293 | ||
98bf40cd | 294 | afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY); |
e833251a DH |
295 | } |
296 | ||
31143d5d DH |
297 | /* |
298 | * attach the data from a bunch of pages on an inode to a call | |
299 | */ | |
39c6acea | 300 | static int afs_send_pages(struct afs_call *call, struct msghdr *msg) |
31143d5d | 301 | { |
2f5705a5 DH |
302 | struct bio_vec bv[AFS_BVEC_MAX]; |
303 | unsigned int bytes, nr, loop, offset; | |
31143d5d DH |
304 | pgoff_t first = call->first, last = call->last; |
305 | int ret; | |
306 | ||
31143d5d DH |
307 | offset = call->first_offset; |
308 | call->first_offset = 0; | |
309 | ||
310 | do { | |
2f5705a5 | 311 | afs_load_bvec(call, msg, bv, first, last, offset); |
2c099014 DH |
312 | trace_afs_send_pages(call, msg, first, last, offset); |
313 | ||
2f5705a5 DH |
314 | offset = 0; |
315 | bytes = msg->msg_iter.count; | |
316 | nr = msg->msg_iter.nr_segs; | |
317 | ||
f044c884 | 318 | ret = rxrpc_kernel_send_data(call->net->socket, call->rxcall, msg, |
e833251a | 319 | bytes, afs_notify_end_request_tx); |
2f5705a5 DH |
320 | for (loop = 0; loop < nr; loop++) |
321 | put_page(bv[loop].bv_page); | |
31143d5d DH |
322 | if (ret < 0) |
323 | break; | |
2f5705a5 DH |
324 | |
325 | first += nr; | |
5bbf5d39 | 326 | } while (first <= last); |
31143d5d | 327 | |
2c099014 | 328 | trace_afs_sent_pages(call, call->first, last, first, ret); |
31143d5d DH |
329 | return ret; |
330 | } | |
331 | ||
08e0e7c8 DH |
332 | /* |
333 | * initiate a call | |
334 | */ | |
8b2a464c | 335 | long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, |
33cd7f2b | 336 | gfp_t gfp, bool async) |
08e0e7c8 | 337 | { |
8b2a464c | 338 | struct sockaddr_rxrpc *srx = ac->addr; |
08e0e7c8 DH |
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; |
08e0e7c8 DH |
344 | int ret; |
345 | ||
4d9df986 | 346 | _enter(",{%pISp},", &srx->transport); |
08e0e7c8 | 347 | |
00d3b7a4 DH |
348 | ASSERT(call->type != NULL); |
349 | ASSERT(call->type->name != NULL); | |
350 | ||
31143d5d DH |
351 | _debug("____MAKE %p{%s,%x} [%d]____", |
352 | call, call->type->name, key_serial(call->key), | |
f044c884 | 353 | atomic_read(&call->net->nr_outstanding_calls)); |
00d3b7a4 | 354 | |
56ff9c83 | 355 | call->async = async; |
08e0e7c8 | 356 | |
e754eba6 DH |
357 | /* Work out the length we're going to transmit. This is awkward for |
358 | * calls such as FS.StoreData where there's an extra injection of data | |
359 | * after the initial fixed part. | |
360 | */ | |
361 | tx_total_len = call->request_size; | |
362 | if (call->send_pages) { | |
1199db60 DH |
363 | if (call->last == call->first) { |
364 | tx_total_len += call->last_to - call->first_offset; | |
365 | } else { | |
366 | /* It looks mathematically like you should be able to | |
367 | * combine the following lines with the ones above, but | |
368 | * unsigned arithmetic is fun when it wraps... | |
369 | */ | |
370 | tx_total_len += PAGE_SIZE - call->first_offset; | |
371 | tx_total_len += call->last_to; | |
372 | tx_total_len += (call->last - call->first - 1) * PAGE_SIZE; | |
373 | } | |
e754eba6 DH |
374 | } |
375 | ||
08e0e7c8 | 376 | /* create a call */ |
4d9df986 | 377 | rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key, |
e754eba6 DH |
378 | (unsigned long)call, |
379 | tx_total_len, gfp, | |
56ff9c83 DH |
380 | (async ? |
381 | afs_wake_up_async_call : | |
a68f4a27 | 382 | afs_wake_up_call_waiter), |
a25e21f0 DH |
383 | call->upgrade, |
384 | call->debug_id); | |
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; | |
bc5e3a54 | 402 | msg.msg_flags = MSG_WAITALL | (call->send_pages ? MSG_MORE : 0); |
08e0e7c8 | 403 | |
f044c884 | 404 | ret = rxrpc_kernel_send_data(call->net->socket, rxcall, |
e833251a DH |
405 | &msg, call->request_size, |
406 | afs_notify_end_request_tx); | |
08e0e7c8 DH |
407 | if (ret < 0) |
408 | goto error_do_abort; | |
409 | ||
31143d5d | 410 | if (call->send_pages) { |
39c6acea | 411 | ret = afs_send_pages(call, &msg); |
31143d5d DH |
412 | if (ret < 0) |
413 | goto error_do_abort; | |
414 | } | |
415 | ||
08e0e7c8 DH |
416 | /* at this point, an async call may no longer exist as it may have |
417 | * already completed */ | |
56ff9c83 DH |
418 | if (call->async) |
419 | return -EINPROGRESS; | |
420 | ||
d2ddc776 | 421 | return afs_wait_for_call_to_complete(call, ac); |
08e0e7c8 DH |
422 | |
423 | error_do_abort: | |
70af0e3b DH |
424 | call->state = AFS_CALL_COMPLETE; |
425 | if (ret != -ECONNABORTED) { | |
f044c884 DH |
426 | rxrpc_kernel_abort_call(call->net->socket, rxcall, |
427 | RX_USER_ABORT, ret, "KSD"); | |
70af0e3b | 428 | } else { |
70af0e3b | 429 | offset = 0; |
f044c884 | 430 | rxrpc_kernel_recv_data(call->net->socket, rxcall, NULL, |
33cd7f2b | 431 | 0, &offset, false, &call->abort_code, |
f044c884 | 432 | &call->service_id); |
d2ddc776 DH |
433 | ac->abort_code = call->abort_code; |
434 | ac->responded = true; | |
70af0e3b | 435 | } |
025db80c DH |
436 | call->error = ret; |
437 | trace_afs_call_done(call); | |
08e0e7c8 | 438 | error_kill_call: |
341f741f | 439 | afs_put_call(call); |
d2ddc776 | 440 | ac->error = ret; |
08e0e7c8 DH |
441 | _leave(" = %d", ret); |
442 | return ret; | |
443 | } | |
444 | ||
08e0e7c8 DH |
445 | /* |
446 | * deliver messages to a call | |
447 | */ | |
448 | static void afs_deliver_to_call(struct afs_call *call) | |
449 | { | |
98bf40cd DH |
450 | enum afs_call_state state; |
451 | u32 abort_code, remote_abort = 0; | |
08e0e7c8 DH |
452 | int ret; |
453 | ||
d001648e DH |
454 | _enter("%s", call->type->name); |
455 | ||
98bf40cd DH |
456 | while (state = READ_ONCE(call->state), |
457 | state == AFS_CALL_CL_AWAIT_REPLY || | |
458 | state == AFS_CALL_SV_AWAIT_OP_ID || | |
459 | state == AFS_CALL_SV_AWAIT_REQUEST || | |
460 | state == AFS_CALL_SV_AWAIT_ACK | |
d001648e | 461 | ) { |
98bf40cd | 462 | if (state == AFS_CALL_SV_AWAIT_ACK) { |
d001648e | 463 | size_t offset = 0; |
f044c884 DH |
464 | ret = rxrpc_kernel_recv_data(call->net->socket, |
465 | call->rxcall, | |
d001648e | 466 | NULL, 0, &offset, false, |
98bf40cd | 467 | &remote_abort, |
a68f4a27 | 468 | &call->service_id); |
8e8d7f13 DH |
469 | trace_afs_recv_data(call, 0, offset, false, ret); |
470 | ||
d001648e DH |
471 | if (ret == -EINPROGRESS || ret == -EAGAIN) |
472 | return; | |
98bf40cd DH |
473 | if (ret < 0 || ret == 1) { |
474 | if (ret == 1) | |
475 | ret = 0; | |
025db80c | 476 | goto call_complete; |
98bf40cd | 477 | } |
d001648e | 478 | return; |
08e0e7c8 DH |
479 | } |
480 | ||
d001648e | 481 | ret = call->type->deliver(call); |
98bf40cd | 482 | state = READ_ONCE(call->state); |
d001648e DH |
483 | switch (ret) { |
484 | case 0: | |
98bf40cd | 485 | if (state == AFS_CALL_CL_PROC_REPLY) |
025db80c | 486 | goto call_complete; |
98bf40cd | 487 | ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY); |
d001648e DH |
488 | goto done; |
489 | case -EINPROGRESS: | |
490 | case -EAGAIN: | |
491 | goto out; | |
98bf40cd | 492 | case -EIO: |
70af0e3b | 493 | case -ECONNABORTED: |
98bf40cd DH |
494 | ASSERTCMP(state, ==, AFS_CALL_COMPLETE); |
495 | goto done; | |
d001648e DH |
496 | case -ENOTCONN: |
497 | abort_code = RX_CALL_DEAD; | |
f044c884 | 498 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 499 | abort_code, ret, "KNC"); |
98bf40cd | 500 | goto local_abort; |
d001648e | 501 | case -ENOTSUPP: |
1157f153 | 502 | abort_code = RXGEN_OPCODE; |
f044c884 | 503 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 504 | abort_code, ret, "KIV"); |
98bf40cd | 505 | goto local_abort; |
d001648e DH |
506 | case -ENODATA: |
507 | case -EBADMSG: | |
508 | case -EMSGSIZE: | |
509 | default: | |
510 | abort_code = RXGEN_CC_UNMARSHAL; | |
98bf40cd | 511 | if (state != AFS_CALL_CL_AWAIT_REPLY) |
d001648e | 512 | abort_code = RXGEN_SS_UNMARSHAL; |
f044c884 | 513 | rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
3a92789a | 514 | abort_code, -EBADMSG, "KUM"); |
98bf40cd | 515 | goto local_abort; |
d001648e | 516 | } |
08e0e7c8 DH |
517 | } |
518 | ||
d001648e | 519 | done: |
98bf40cd | 520 | if (state == AFS_CALL_COMPLETE && call->incoming) |
341f741f | 521 | afs_put_call(call); |
d001648e | 522 | out: |
08e0e7c8 | 523 | _leave(""); |
d001648e DH |
524 | return; |
525 | ||
98bf40cd DH |
526 | local_abort: |
527 | abort_code = 0; | |
025db80c | 528 | call_complete: |
98bf40cd DH |
529 | afs_set_call_complete(call, ret, remote_abort); |
530 | state = AFS_CALL_COMPLETE; | |
d001648e | 531 | goto done; |
08e0e7c8 DH |
532 | } |
533 | ||
534 | /* | |
535 | * wait synchronously for a call to complete | |
536 | */ | |
d2ddc776 DH |
537 | static long afs_wait_for_call_to_complete(struct afs_call *call, |
538 | struct afs_addr_cursor *ac) | |
08e0e7c8 | 539 | { |
bc5e3a54 | 540 | signed long rtt2, timeout; |
33cd7f2b | 541 | long ret; |
bc5e3a54 DH |
542 | u64 rtt; |
543 | u32 life, last_life; | |
08e0e7c8 DH |
544 | |
545 | DECLARE_WAITQUEUE(myself, current); | |
546 | ||
547 | _enter(""); | |
548 | ||
f044c884 | 549 | rtt = rxrpc_kernel_get_rtt(call->net->socket, call->rxcall); |
bc5e3a54 DH |
550 | rtt2 = nsecs_to_jiffies64(rtt) * 2; |
551 | if (rtt2 < 2) | |
552 | rtt2 = 2; | |
553 | ||
554 | timeout = rtt2; | |
f044c884 | 555 | last_life = rxrpc_kernel_check_life(call->net->socket, call->rxcall); |
bc5e3a54 | 556 | |
08e0e7c8 DH |
557 | add_wait_queue(&call->waitq, &myself); |
558 | for (;;) { | |
bc5e3a54 | 559 | set_current_state(TASK_UNINTERRUPTIBLE); |
08e0e7c8 DH |
560 | |
561 | /* deliver any messages that are in the queue */ | |
98bf40cd DH |
562 | if (!afs_check_call_state(call, AFS_CALL_COMPLETE) && |
563 | call->need_attention) { | |
d001648e | 564 | call->need_attention = false; |
08e0e7c8 DH |
565 | __set_current_state(TASK_RUNNING); |
566 | afs_deliver_to_call(call); | |
567 | continue; | |
568 | } | |
569 | ||
98bf40cd | 570 | if (afs_check_call_state(call, AFS_CALL_COMPLETE)) |
08e0e7c8 | 571 | break; |
bc5e3a54 | 572 | |
f044c884 | 573 | life = rxrpc_kernel_check_life(call->net->socket, call->rxcall); |
bc5e3a54 DH |
574 | if (timeout == 0 && |
575 | life == last_life && signal_pending(current)) | |
576 | break; | |
577 | ||
578 | if (life != last_life) { | |
579 | timeout = rtt2; | |
580 | last_life = life; | |
581 | } | |
582 | ||
583 | timeout = schedule_timeout(timeout); | |
08e0e7c8 DH |
584 | } |
585 | ||
586 | remove_wait_queue(&call->waitq, &myself); | |
587 | __set_current_state(TASK_RUNNING); | |
588 | ||
954cd6dc | 589 | /* Kill off the call if it's still live. */ |
98bf40cd | 590 | if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) { |
954cd6dc | 591 | _debug("call interrupted"); |
d2ddc776 | 592 | if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall, |
98bf40cd DH |
593 | RX_USER_ABORT, -EINTR, "KWI")) |
594 | afs_set_call_complete(call, -EINTR, 0); | |
08e0e7c8 DH |
595 | } |
596 | ||
98bf40cd | 597 | spin_lock_bh(&call->state_lock); |
d2ddc776 DH |
598 | ac->abort_code = call->abort_code; |
599 | ac->error = call->error; | |
98bf40cd | 600 | spin_unlock_bh(&call->state_lock); |
d2ddc776 DH |
601 | |
602 | ret = ac->error; | |
603 | switch (ret) { | |
604 | case 0: | |
605 | if (call->ret_reply0) { | |
606 | ret = (long)call->reply[0]; | |
607 | call->reply[0] = NULL; | |
608 | } | |
609 | /* Fall through */ | |
610 | case -ECONNABORTED: | |
611 | ac->responded = true; | |
612 | break; | |
33cd7f2b DH |
613 | } |
614 | ||
08e0e7c8 | 615 | _debug("call complete"); |
341f741f | 616 | afs_put_call(call); |
33cd7f2b | 617 | _leave(" = %p", (void *)ret); |
08e0e7c8 DH |
618 | return ret; |
619 | } | |
620 | ||
621 | /* | |
622 | * wake up a waiting call | |
623 | */ | |
d001648e DH |
624 | static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall, |
625 | unsigned long call_user_ID) | |
08e0e7c8 | 626 | { |
d001648e DH |
627 | struct afs_call *call = (struct afs_call *)call_user_ID; |
628 | ||
629 | call->need_attention = true; | |
08e0e7c8 DH |
630 | wake_up(&call->waitq); |
631 | } | |
632 | ||
633 | /* | |
634 | * wake up an asynchronous call | |
635 | */ | |
d001648e DH |
636 | static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall, |
637 | unsigned long call_user_ID) | |
08e0e7c8 | 638 | { |
d001648e | 639 | struct afs_call *call = (struct afs_call *)call_user_ID; |
341f741f | 640 | int u; |
d001648e | 641 | |
8e8d7f13 | 642 | trace_afs_notify_call(rxcall, call); |
d001648e | 643 | call->need_attention = true; |
341f741f DH |
644 | |
645 | u = __atomic_add_unless(&call->usage, 1, 0); | |
646 | if (u != 0) { | |
647 | trace_afs_call(call, afs_call_trace_wake, u, | |
f044c884 | 648 | atomic_read(&call->net->nr_outstanding_calls), |
341f741f DH |
649 | __builtin_return_address(0)); |
650 | ||
651 | if (!queue_work(afs_async_calls, &call->async_work)) | |
652 | afs_put_call(call); | |
653 | } | |
08e0e7c8 DH |
654 | } |
655 | ||
08e0e7c8 | 656 | /* |
341f741f DH |
657 | * Delete an asynchronous call. The work item carries a ref to the call struct |
658 | * that we need to release. | |
08e0e7c8 | 659 | */ |
d001648e | 660 | static void afs_delete_async_call(struct work_struct *work) |
08e0e7c8 | 661 | { |
d001648e DH |
662 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
663 | ||
08e0e7c8 DH |
664 | _enter(""); |
665 | ||
341f741f | 666 | afs_put_call(call); |
08e0e7c8 DH |
667 | |
668 | _leave(""); | |
669 | } | |
670 | ||
671 | /* | |
341f741f DH |
672 | * Perform I/O processing on an asynchronous call. The work item carries a ref |
673 | * to the call struct that we either need to release or to pass on. | |
08e0e7c8 | 674 | */ |
d001648e | 675 | static void afs_process_async_call(struct work_struct *work) |
08e0e7c8 | 676 | { |
d001648e DH |
677 | struct afs_call *call = container_of(work, struct afs_call, async_work); |
678 | ||
08e0e7c8 DH |
679 | _enter(""); |
680 | ||
d001648e DH |
681 | if (call->state < AFS_CALL_COMPLETE && call->need_attention) { |
682 | call->need_attention = false; | |
08e0e7c8 | 683 | afs_deliver_to_call(call); |
d001648e | 684 | } |
08e0e7c8 | 685 | |
56ff9c83 | 686 | if (call->state == AFS_CALL_COMPLETE) { |
97e3043a | 687 | call->reply[0] = NULL; |
08e0e7c8 | 688 | |
341f741f DH |
689 | /* We have two refs to release - one from the alloc and one |
690 | * queued with the work item - and we can't just deallocate the | |
691 | * call because the work item may be queued again. | |
692 | */ | |
d001648e | 693 | call->async_work.func = afs_delete_async_call; |
341f741f DH |
694 | if (!queue_work(afs_async_calls, &call->async_work)) |
695 | afs_put_call(call); | |
08e0e7c8 DH |
696 | } |
697 | ||
341f741f | 698 | afs_put_call(call); |
08e0e7c8 DH |
699 | _leave(""); |
700 | } | |
701 | ||
00e90712 DH |
702 | static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID) |
703 | { | |
704 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
705 | ||
706 | call->rxcall = rxcall; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Charge the incoming call preallocation. | |
711 | */ | |
f044c884 | 712 | void afs_charge_preallocation(struct work_struct *work) |
00e90712 | 713 | { |
f044c884 DH |
714 | struct afs_net *net = |
715 | container_of(work, struct afs_net, charge_preallocation_work); | |
716 | struct afs_call *call = net->spare_incoming_call; | |
00e90712 DH |
717 | |
718 | for (;;) { | |
719 | if (!call) { | |
f044c884 | 720 | call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL); |
00e90712 DH |
721 | if (!call) |
722 | break; | |
723 | ||
56ff9c83 | 724 | call->async = true; |
98bf40cd | 725 | call->state = AFS_CALL_SV_AWAIT_OP_ID; |
56ff9c83 | 726 | init_waitqueue_head(&call->waitq); |
00e90712 DH |
727 | } |
728 | ||
f044c884 | 729 | if (rxrpc_kernel_charge_accept(net->socket, |
00e90712 DH |
730 | afs_wake_up_async_call, |
731 | afs_rx_attach, | |
732 | (unsigned long)call, | |
a25e21f0 DH |
733 | GFP_KERNEL, |
734 | call->debug_id) < 0) | |
00e90712 DH |
735 | break; |
736 | call = NULL; | |
737 | } | |
f044c884 | 738 | net->spare_incoming_call = call; |
00e90712 DH |
739 | } |
740 | ||
741 | /* | |
742 | * Discard a preallocated call when a socket is shut down. | |
743 | */ | |
744 | static void afs_rx_discard_new_call(struct rxrpc_call *rxcall, | |
745 | unsigned long user_call_ID) | |
746 | { | |
747 | struct afs_call *call = (struct afs_call *)user_call_ID; | |
748 | ||
00e90712 | 749 | call->rxcall = NULL; |
341f741f | 750 | afs_put_call(call); |
00e90712 DH |
751 | } |
752 | ||
d001648e DH |
753 | /* |
754 | * Notification of an incoming call. | |
755 | */ | |
00e90712 DH |
756 | static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall, |
757 | unsigned long user_call_ID) | |
d001648e | 758 | { |
f044c884 DH |
759 | struct afs_net *net = afs_sock2net(sk); |
760 | ||
761 | queue_work(afs_wq, &net->charge_preallocation_work); | |
d001648e DH |
762 | } |
763 | ||
08e0e7c8 | 764 | /* |
372ee163 DH |
765 | * Grab the operation ID from an incoming cache manager call. The socket |
766 | * buffer is discarded on error or if we don't yet have sufficient data. | |
08e0e7c8 | 767 | */ |
d001648e | 768 | static int afs_deliver_cm_op_id(struct afs_call *call) |
08e0e7c8 | 769 | { |
d001648e | 770 | int ret; |
08e0e7c8 | 771 | |
d001648e | 772 | _enter("{%zu}", call->offset); |
08e0e7c8 DH |
773 | |
774 | ASSERTCMP(call->offset, <, 4); | |
775 | ||
776 | /* the operation ID forms the first four bytes of the request data */ | |
50a2c953 | 777 | ret = afs_extract_data(call, &call->tmp, 4, true); |
d001648e DH |
778 | if (ret < 0) |
779 | return ret; | |
08e0e7c8 | 780 | |
50a2c953 | 781 | call->operation_ID = ntohl(call->tmp); |
98bf40cd | 782 | afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST); |
d001648e | 783 | call->offset = 0; |
08e0e7c8 DH |
784 | |
785 | /* ask the cache manager to route the call (it'll change the call type | |
786 | * if successful) */ | |
787 | if (!afs_cm_incoming_call(call)) | |
788 | return -ENOTSUPP; | |
789 | ||
8e8d7f13 DH |
790 | trace_afs_cb_call(call); |
791 | ||
08e0e7c8 DH |
792 | /* pass responsibility for the remainer of this message off to the |
793 | * cache manager op */ | |
d001648e | 794 | return call->type->deliver(call); |
08e0e7c8 DH |
795 | } |
796 | ||
e833251a DH |
797 | /* |
798 | * Advance the AFS call state when an RxRPC service call ends the transmit | |
799 | * phase. | |
800 | */ | |
801 | static void afs_notify_end_reply_tx(struct sock *sock, | |
802 | struct rxrpc_call *rxcall, | |
803 | unsigned long call_user_ID) | |
804 | { | |
805 | struct afs_call *call = (struct afs_call *)call_user_ID; | |
806 | ||
98bf40cd | 807 | afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK); |
e833251a DH |
808 | } |
809 | ||
08e0e7c8 DH |
810 | /* |
811 | * send an empty reply | |
812 | */ | |
813 | void afs_send_empty_reply(struct afs_call *call) | |
814 | { | |
f044c884 | 815 | struct afs_net *net = call->net; |
08e0e7c8 | 816 | struct msghdr msg; |
08e0e7c8 DH |
817 | |
818 | _enter(""); | |
819 | ||
f044c884 | 820 | rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0); |
e754eba6 | 821 | |
08e0e7c8 DH |
822 | msg.msg_name = NULL; |
823 | msg.msg_namelen = 0; | |
bfd4e956 | 824 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0); |
08e0e7c8 DH |
825 | msg.msg_control = NULL; |
826 | msg.msg_controllen = 0; | |
827 | msg.msg_flags = 0; | |
828 | ||
f044c884 | 829 | switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0, |
e833251a | 830 | afs_notify_end_reply_tx)) { |
08e0e7c8 DH |
831 | case 0: |
832 | _leave(" [replied]"); | |
833 | return; | |
834 | ||
835 | case -ENOMEM: | |
836 | _debug("oom"); | |
f044c884 | 837 | rxrpc_kernel_abort_call(net->socket, call->rxcall, |
3a92789a | 838 | RX_USER_ABORT, -ENOMEM, "KOO"); |
08e0e7c8 | 839 | default: |
08e0e7c8 DH |
840 | _leave(" [error]"); |
841 | return; | |
842 | } | |
843 | } | |
844 | ||
b908fe6b DH |
845 | /* |
846 | * send a simple reply | |
847 | */ | |
848 | void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len) | |
849 | { | |
f044c884 | 850 | struct afs_net *net = call->net; |
b908fe6b | 851 | struct msghdr msg; |
2e90b1c4 | 852 | struct kvec iov[1]; |
bd6dc742 | 853 | int n; |
b908fe6b DH |
854 | |
855 | _enter(""); | |
856 | ||
f044c884 | 857 | rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len); |
e754eba6 | 858 | |
b908fe6b DH |
859 | iov[0].iov_base = (void *) buf; |
860 | iov[0].iov_len = len; | |
861 | msg.msg_name = NULL; | |
862 | msg.msg_namelen = 0; | |
2e90b1c4 | 863 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len); |
b908fe6b DH |
864 | msg.msg_control = NULL; |
865 | msg.msg_controllen = 0; | |
866 | msg.msg_flags = 0; | |
867 | ||
f044c884 | 868 | n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len, |
e833251a | 869 | afs_notify_end_reply_tx); |
bd6dc742 | 870 | if (n >= 0) { |
6c67c7c3 | 871 | /* Success */ |
b908fe6b DH |
872 | _leave(" [replied]"); |
873 | return; | |
bd6dc742 | 874 | } |
6c67c7c3 | 875 | |
bd6dc742 | 876 | if (n == -ENOMEM) { |
b908fe6b | 877 | _debug("oom"); |
f044c884 | 878 | rxrpc_kernel_abort_call(net->socket, call->rxcall, |
3a92789a | 879 | RX_USER_ABORT, -ENOMEM, "KOO"); |
b908fe6b | 880 | } |
bd6dc742 | 881 | _leave(" [error]"); |
b908fe6b DH |
882 | } |
883 | ||
08e0e7c8 | 884 | /* |
372ee163 | 885 | * Extract a piece of data from the received data socket buffers. |
08e0e7c8 | 886 | */ |
d001648e DH |
887 | int afs_extract_data(struct afs_call *call, void *buf, size_t count, |
888 | bool want_more) | |
08e0e7c8 | 889 | { |
f044c884 | 890 | struct afs_net *net = call->net; |
98bf40cd | 891 | enum afs_call_state state; |
7888da95 | 892 | u32 remote_abort = 0; |
d001648e | 893 | int ret; |
08e0e7c8 | 894 | |
d001648e DH |
895 | _enter("{%s,%zu},,%zu,%d", |
896 | call->type->name, call->offset, count, want_more); | |
08e0e7c8 | 897 | |
d001648e | 898 | ASSERTCMP(call->offset, <=, count); |
08e0e7c8 | 899 | |
f044c884 | 900 | ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, |
d001648e | 901 | buf, count, &call->offset, |
98bf40cd | 902 | want_more, &remote_abort, |
a68f4a27 | 903 | &call->service_id); |
8e8d7f13 | 904 | trace_afs_recv_data(call, count, call->offset, want_more, ret); |
d001648e DH |
905 | if (ret == 0 || ret == -EAGAIN) |
906 | return ret; | |
08e0e7c8 | 907 | |
98bf40cd | 908 | state = READ_ONCE(call->state); |
d001648e | 909 | if (ret == 1) { |
98bf40cd DH |
910 | switch (state) { |
911 | case AFS_CALL_CL_AWAIT_REPLY: | |
912 | afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY); | |
d001648e | 913 | break; |
98bf40cd DH |
914 | case AFS_CALL_SV_AWAIT_REQUEST: |
915 | afs_set_call_state(call, state, AFS_CALL_SV_REPLYING); | |
d001648e | 916 | break; |
98bf40cd DH |
917 | case AFS_CALL_COMPLETE: |
918 | kdebug("prem complete %d", call->error); | |
919 | return -EIO; | |
d001648e DH |
920 | default: |
921 | break; | |
922 | } | |
923 | return 0; | |
08e0e7c8 | 924 | } |
d001648e | 925 | |
98bf40cd | 926 | afs_set_call_complete(call, ret, remote_abort); |
d001648e | 927 | return ret; |
08e0e7c8 | 928 | } |