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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / fs / afs / rxrpc.c
blob1ecc67da6c1a4e9cf570f9624ef5603146c52880
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Maintain an RxRPC server socket to do AFS communications through
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/slab.h>
9 #include <linux/sched/signal.h>
10
11 #include <net/sock.h>
12 #include <net/af_rxrpc.h>
13 #include "internal.h"
14 #include "afs_cm.h"
15 #include "protocol_yfs.h"
16
17 struct workqueue_struct *afs_async_calls;
18
19 static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
20 static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
21 static void afs_process_async_call(struct work_struct *);
22 static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
23 static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
24 static int afs_deliver_cm_op_id(struct afs_call *);
25
26 /* asynchronous incoming call initial processing */
27 static const struct afs_call_type afs_RXCMxxxx = {
28 .name = "CB.xxxx",
29 .deliver = afs_deliver_cm_op_id,
30 };
31
32 /*
33 * open an RxRPC socket and bind it to be a server for callback notifications
34 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
35 */
36 int afs_open_socket(struct afs_net *net)
37 {
38 struct sockaddr_rxrpc srx;
39 struct socket *socket;
40 unsigned int min_level;
41 int ret;
42
43 _enter("");
44
45 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
46 if (ret < 0)
47 goto error_1;
48
49 socket->sk->sk_allocation = GFP_NOFS;
50
51 /* bind the callback manager's address to make this a server socket */
52 memset(&srx, 0, sizeof(srx));
53 srx.srx_family = AF_RXRPC;
54 srx.srx_service = CM_SERVICE;
55 srx.transport_type = SOCK_DGRAM;
56 srx.transport_len = sizeof(srx.transport.sin6);
57 srx.transport.sin6.sin6_family = AF_INET6;
58 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
59
60 min_level = RXRPC_SECURITY_ENCRYPT;
61 ret = kernel_setsockopt(socket, SOL_RXRPC, RXRPC_MIN_SECURITY_LEVEL,
62 (void *)&min_level, sizeof(min_level));
63 if (ret < 0)
64 goto error_2;
65
66 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
67 if (ret == -EADDRINUSE) {
68 srx.transport.sin6.sin6_port = 0;
69 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
70 }
71 if (ret < 0)
72 goto error_2;
73
74 srx.srx_service = YFS_CM_SERVICE;
75 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
76 if (ret < 0)
77 goto error_2;
78
79 /* Ideally, we'd turn on service upgrade here, but we can't because
80 * OpenAFS is buggy and leaks the userStatus field from packet to
81 * packet and between FS packets and CB packets - so if we try to do an
82 * upgrade on an FS packet, OpenAFS will leak that into the CB packet
83 * it sends back to us.
84 */
85
86 rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
87 afs_rx_discard_new_call);
88
89 ret = kernel_listen(socket, INT_MAX);
90 if (ret < 0)
91 goto error_2;
92
93 net->socket = socket;
94 afs_charge_preallocation(&net->charge_preallocation_work);
95 _leave(" = 0");
96 return 0;
97
98 error_2:
99 sock_release(socket);
100 error_1:
101 _leave(" = %d", ret);
102 return ret;
103 }
104
105 /*
106 * close the RxRPC socket AFS was using
107 */
108 void afs_close_socket(struct afs_net *net)
109 {
110 _enter("");
111
112 kernel_listen(net->socket, 0);
113 flush_workqueue(afs_async_calls);
114
115 if (net->spare_incoming_call) {
116 afs_put_call(net->spare_incoming_call);
117 net->spare_incoming_call = NULL;
118 }
119
120 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
121 wait_var_event(&net->nr_outstanding_calls,
122 !atomic_read(&net->nr_outstanding_calls));
123 _debug("no outstanding calls");
124
125 kernel_sock_shutdown(net->socket, SHUT_RDWR);
126 flush_workqueue(afs_async_calls);
127 sock_release(net->socket);
128
129 _debug("dework");
130 _leave("");
131 }
132
133 /*
134 * Allocate a call.
135 */
136 static struct afs_call *afs_alloc_call(struct afs_net *net,
137 const struct afs_call_type *type,
138 gfp_t gfp)
139 {
140 struct afs_call *call;
141 int o;
142
143 call = kzalloc(sizeof(*call), gfp);
144 if (!call)
145 return NULL;
146
147 call->type = type;
148 call->net = net;
149 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
150 atomic_set(&call->usage, 1);
151 INIT_WORK(&call->async_work, afs_process_async_call);
152 init_waitqueue_head(&call->waitq);
153 spin_lock_init(&call->state_lock);
154 call->iter = &call->def_iter;
155
156 o = atomic_inc_return(&net->nr_outstanding_calls);
157 trace_afs_call(call, afs_call_trace_alloc, 1, o,
158 __builtin_return_address(0));
159 return call;
160 }
161
162 /*
163 * Dispose of a reference on a call.
164 */
165 void afs_put_call(struct afs_call *call)
166 {
167 struct afs_net *net = call->net;
168 int n = atomic_dec_return(&call->usage);
169 int o = atomic_read(&net->nr_outstanding_calls);
170
171 trace_afs_call(call, afs_call_trace_put, n, o,
172 __builtin_return_address(0));
173
174 ASSERTCMP(n, >=, 0);
175 if (n == 0) {
176 ASSERT(!work_pending(&call->async_work));
177 ASSERT(call->type->name != NULL);
178
179 if (call->rxcall) {
180 rxrpc_kernel_end_call(net->socket, call->rxcall);
181 call->rxcall = NULL;
182 }
183 if (call->type->destructor)
184 call->type->destructor(call);
185
186 afs_put_server(call->net, call->server, afs_server_trace_put_call);
187 afs_put_cb_interest(call->net, call->cbi);
188 afs_put_addrlist(call->alist);
189 kfree(call->request);
190
191 trace_afs_call(call, afs_call_trace_free, 0, o,
192 __builtin_return_address(0));
193 kfree(call);
194
195 o = atomic_dec_return(&net->nr_outstanding_calls);
196 if (o == 0)
197 wake_up_var(&net->nr_outstanding_calls);
198 }
199 }
200
201 static struct afs_call *afs_get_call(struct afs_call *call,
202 enum afs_call_trace why)
203 {
204 int u = atomic_inc_return(&call->usage);
205
206 trace_afs_call(call, why, u,
207 atomic_read(&call->net->nr_outstanding_calls),
208 __builtin_return_address(0));
209 return call;
210 }
211
212 /*
213 * Queue the call for actual work.
214 */
215 static void afs_queue_call_work(struct afs_call *call)
216 {
217 if (call->type->work) {
218 INIT_WORK(&call->work, call->type->work);
219
220 afs_get_call(call, afs_call_trace_work);
221 if (!queue_work(afs_wq, &call->work))
222 afs_put_call(call);
223 }
224 }
225
226 /*
227 * allocate a call with flat request and reply buffers
228 */
229 struct afs_call *afs_alloc_flat_call(struct afs_net *net,
230 const struct afs_call_type *type,
231 size_t request_size, size_t reply_max)
232 {
233 struct afs_call *call;
234
235 call = afs_alloc_call(net, type, GFP_NOFS);
236 if (!call)
237 goto nomem_call;
238
239 if (request_size) {
240 call->request_size = request_size;
241 call->request = kmalloc(request_size, GFP_NOFS);
242 if (!call->request)
243 goto nomem_free;
244 }
245
246 if (reply_max) {
247 call->reply_max = reply_max;
248 call->buffer = kmalloc(reply_max, GFP_NOFS);
249 if (!call->buffer)
250 goto nomem_free;
251 }
252
253 afs_extract_to_buf(call, call->reply_max);
254 call->operation_ID = type->op;
255 init_waitqueue_head(&call->waitq);
256 return call;
257
258 nomem_free:
259 afs_put_call(call);
260 nomem_call:
261 return NULL;
262 }
263
264 /*
265 * clean up a call with flat buffer
266 */
267 void afs_flat_call_destructor(struct afs_call *call)
268 {
269 _enter("");
270
271 kfree(call->request);
272 call->request = NULL;
273 kfree(call->buffer);
274 call->buffer = NULL;
275 }
276
277 #define AFS_BVEC_MAX 8
278
279 /*
280 * Load the given bvec with the next few pages.
281 */
282 static void afs_load_bvec(struct afs_call *call, struct msghdr *msg,
283 struct bio_vec *bv, pgoff_t first, pgoff_t last,
284 unsigned offset)
285 {
286 struct page *pages[AFS_BVEC_MAX];
287 unsigned int nr, n, i, to, bytes = 0;
288
289 nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX);
290 n = find_get_pages_contig(call->mapping, first, nr, pages);
291 ASSERTCMP(n, ==, nr);
292
293 msg->msg_flags |= MSG_MORE;
294 for (i = 0; i < nr; i++) {
295 to = PAGE_SIZE;
296 if (first + i >= last) {
297 to = call->last_to;
298 msg->msg_flags &= ~MSG_MORE;
299 }
300 bv[i].bv_page = pages[i];
301 bv[i].bv_len = to - offset;
302 bv[i].bv_offset = offset;
303 bytes += to - offset;
304 offset = 0;
305 }
306
307 iov_iter_bvec(&msg->msg_iter, WRITE, bv, nr, bytes);
308 }
309
310 /*
311 * Advance the AFS call state when the RxRPC call ends the transmit phase.
312 */
313 static void afs_notify_end_request_tx(struct sock *sock,
314 struct rxrpc_call *rxcall,
315 unsigned long call_user_ID)
316 {
317 struct afs_call *call = (struct afs_call *)call_user_ID;
318
319 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
320 }
321
322 /*
323 * attach the data from a bunch of pages on an inode to a call
324 */
325 static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
326 {
327 struct bio_vec bv[AFS_BVEC_MAX];
328 unsigned int bytes, nr, loop, offset;
329 pgoff_t first = call->first, last = call->last;
330 int ret;
331
332 offset = call->first_offset;
333 call->first_offset = 0;
334
335 do {
336 afs_load_bvec(call, msg, bv, first, last, offset);
337 trace_afs_send_pages(call, msg, first, last, offset);
338
339 offset = 0;
340 bytes = msg->msg_iter.count;
341 nr = msg->msg_iter.nr_segs;
342
343 ret = rxrpc_kernel_send_data(call->net->socket, call->rxcall, msg,
344 bytes, afs_notify_end_request_tx);
345 for (loop = 0; loop < nr; loop++)
346 put_page(bv[loop].bv_page);
347 if (ret < 0)
348 break;
349
350 first += nr;
351 } while (first <= last);
352
353 trace_afs_sent_pages(call, call->first, last, first, ret);
354 return ret;
355 }
356
357 /*
358 * Initiate a call and synchronously queue up the parameters for dispatch. Any
359 * error is stored into the call struct, which the caller must check for.
360 */
361 void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
362 {
363 struct sockaddr_rxrpc *srx = &ac->alist->addrs[ac->index];
364 struct rxrpc_call *rxcall;
365 struct msghdr msg;
366 struct kvec iov[1];
367 s64 tx_total_len;
368 int ret;
369
370 _enter(",{%pISp},", &srx->transport);
371
372 ASSERT(call->type != NULL);
373 ASSERT(call->type->name != NULL);
374
375 _debug("____MAKE %p{%s,%x} [%d]____",
376 call, call->type->name, key_serial(call->key),
377 atomic_read(&call->net->nr_outstanding_calls));
378
379 call->addr_ix = ac->index;
380 call->alist = afs_get_addrlist(ac->alist);
381
382 /* Work out the length we're going to transmit. This is awkward for
383 * calls such as FS.StoreData where there's an extra injection of data
384 * after the initial fixed part.
385 */
386 tx_total_len = call->request_size;
387 if (call->send_pages) {
388 if (call->last == call->first) {
389 tx_total_len += call->last_to - call->first_offset;
390 } else {
391 /* It looks mathematically like you should be able to
392 * combine the following lines with the ones above, but
393 * unsigned arithmetic is fun when it wraps...
394 */
395 tx_total_len += PAGE_SIZE - call->first_offset;
396 tx_total_len += call->last_to;
397 tx_total_len += (call->last - call->first - 1) * PAGE_SIZE;
398 }
399 }
400
401 /* If the call is going to be asynchronous, we need an extra ref for
402 * the call to hold itself so the caller need not hang on to its ref.
403 */
404 if (call->async) {
405 afs_get_call(call, afs_call_trace_get);
406 call->drop_ref = true;
407 }
408
409 /* create a call */
410 rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
411 (unsigned long)call,
412 tx_total_len, gfp,
413 (call->async ?
414 afs_wake_up_async_call :
415 afs_wake_up_call_waiter),
416 call->upgrade,
417 (call->intr ? RXRPC_PREINTERRUPTIBLE :
418 RXRPC_UNINTERRUPTIBLE),
419 call->debug_id);
420 if (IS_ERR(rxcall)) {
421 ret = PTR_ERR(rxcall);
422 call->error = ret;
423 goto error_kill_call;
424 }
425
426 call->rxcall = rxcall;
427
428 if (call->max_lifespan)
429 rxrpc_kernel_set_max_life(call->net->socket, rxcall,
430 call->max_lifespan);
431
432 /* send the request */
433 iov[0].iov_base = call->request;
434 iov[0].iov_len = call->request_size;
435
436 msg.msg_name = NULL;
437 msg.msg_namelen = 0;
438 iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, call->request_size);
439 msg.msg_control = NULL;
440 msg.msg_controllen = 0;
441 msg.msg_flags = MSG_WAITALL | (call->send_pages ? MSG_MORE : 0);
442
443 ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
444 &msg, call->request_size,
445 afs_notify_end_request_tx);
446 if (ret < 0)
447 goto error_do_abort;
448
449 if (call->send_pages) {
450 ret = afs_send_pages(call, &msg);
451 if (ret < 0)
452 goto error_do_abort;
453 }
454
455 /* Note that at this point, we may have received the reply or an abort
456 * - and an asynchronous call may already have completed.
457 *
458 * afs_wait_for_call_to_complete(call, ac)
459 * must be called to synchronously clean up.
460 */
461 return;
462
463 error_do_abort:
464 if (ret != -ECONNABORTED) {
465 rxrpc_kernel_abort_call(call->net->socket, rxcall,
466 RX_USER_ABORT, ret, "KSD");
467 } else {
468 iov_iter_kvec(&msg.msg_iter, READ, NULL, 0, 0);
469 rxrpc_kernel_recv_data(call->net->socket, rxcall,
470 &msg.msg_iter, false,
471 &call->abort_code, &call->service_id);
472 ac->abort_code = call->abort_code;
473 ac->responded = true;
474 }
475 call->error = ret;
476 trace_afs_call_done(call);
477 error_kill_call:
478 if (call->type->done)
479 call->type->done(call);
480
481 /* We need to dispose of the extra ref we grabbed for an async call.
482 * The call, however, might be queued on afs_async_calls and we need to
483 * make sure we don't get any more notifications that might requeue it.
484 */
485 if (call->rxcall) {
486 rxrpc_kernel_end_call(call->net->socket, call->rxcall);
487 call->rxcall = NULL;
488 }
489 if (call->async) {
490 if (cancel_work_sync(&call->async_work))
491 afs_put_call(call);
492 afs_put_call(call);
493 }
494
495 ac->error = ret;
496 call->state = AFS_CALL_COMPLETE;
497 _leave(" = %d", ret);
498 }
499
500 /*
501 * deliver messages to a call
502 */
503 static void afs_deliver_to_call(struct afs_call *call)
504 {
505 enum afs_call_state state;
506 u32 abort_code, remote_abort = 0;
507 int ret;
508
509 _enter("%s", call->type->name);
510
511 while (state = READ_ONCE(call->state),
512 state == AFS_CALL_CL_AWAIT_REPLY ||
513 state == AFS_CALL_SV_AWAIT_OP_ID ||
514 state == AFS_CALL_SV_AWAIT_REQUEST ||
515 state == AFS_CALL_SV_AWAIT_ACK
516 ) {
517 if (state == AFS_CALL_SV_AWAIT_ACK) {
518 iov_iter_kvec(&call->def_iter, READ, NULL, 0, 0);
519 ret = rxrpc_kernel_recv_data(call->net->socket,
520 call->rxcall, &call->def_iter,
521 false, &remote_abort,
522 &call->service_id);
523 trace_afs_receive_data(call, &call->def_iter, false, ret);
524
525 if (ret == -EINPROGRESS || ret == -EAGAIN)
526 return;
527 if (ret < 0 || ret == 1) {
528 if (ret == 1)
529 ret = 0;
530 goto call_complete;
531 }
532 return;
533 }
534
535 if (!call->have_reply_time &&
536 rxrpc_kernel_get_reply_time(call->net->socket,
537 call->rxcall,
538 &call->reply_time))
539 call->have_reply_time = true;
540
541 ret = call->type->deliver(call);
542 state = READ_ONCE(call->state);
543 switch (ret) {
544 case 0:
545 afs_queue_call_work(call);
546 if (state == AFS_CALL_CL_PROC_REPLY) {
547 if (call->cbi)
548 set_bit(AFS_SERVER_FL_MAY_HAVE_CB,
549 &call->cbi->server->flags);
550 goto call_complete;
551 }
552 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);
553 goto done;
554 case -EINPROGRESS:
555 case -EAGAIN:
556 goto out;
557 case -ECONNABORTED:
558 ASSERTCMP(state, ==, AFS_CALL_COMPLETE);
559 goto done;
560 case -ENOTSUPP:
561 abort_code = RXGEN_OPCODE;
562 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
563 abort_code, ret, "KIV");
564 goto local_abort;
565 case -EIO:
566 pr_err("kAFS: Call %u in bad state %u\n",
567 call->debug_id, state);
568 /* Fall through */
569 case -ENODATA:
570 case -EBADMSG:
571 case -EMSGSIZE:
572 abort_code = RXGEN_CC_UNMARSHAL;
573 if (state != AFS_CALL_CL_AWAIT_REPLY)
574 abort_code = RXGEN_SS_UNMARSHAL;
575 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
576 abort_code, ret, "KUM");
577 goto local_abort;
578 default:
579 abort_code = RX_USER_ABORT;
580 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
581 abort_code, ret, "KER");
582 goto local_abort;
583 }
584 }
585
586 done:
587 if (call->type->done)
588 call->type->done(call);
589 out:
590 _leave("");
591 return;
592
593 local_abort:
594 abort_code = 0;
595 call_complete:
596 afs_set_call_complete(call, ret, remote_abort);
597 state = AFS_CALL_COMPLETE;
598 goto done;
599 }
600
601 /*
602 * Wait synchronously for a call to complete and clean up the call struct.
603 */
604 long afs_wait_for_call_to_complete(struct afs_call *call,
605 struct afs_addr_cursor *ac)
606 {
607 long ret;
608 bool rxrpc_complete = false;
609
610 DECLARE_WAITQUEUE(myself, current);
611
612 _enter("");
613
614 ret = call->error;
615 if (ret < 0)
616 goto out;
617
618 add_wait_queue(&call->waitq, &myself);
619 for (;;) {
620 set_current_state(TASK_UNINTERRUPTIBLE);
621
622 /* deliver any messages that are in the queue */
623 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
624 call->need_attention) {
625 call->need_attention = false;
626 __set_current_state(TASK_RUNNING);
627 afs_deliver_to_call(call);
628 continue;
629 }
630
631 if (afs_check_call_state(call, AFS_CALL_COMPLETE))
632 break;
633
634 if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) {
635 /* rxrpc terminated the call. */
636 rxrpc_complete = true;
637 break;
638 }
639
640 schedule();
641 }
642
643 remove_wait_queue(&call->waitq, &myself);
644 __set_current_state(TASK_RUNNING);
645
646 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
647 if (rxrpc_complete) {
648 afs_set_call_complete(call, call->error, call->abort_code);
649 } else {
650 /* Kill off the call if it's still live. */
651 _debug("call interrupted");
652 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
653 RX_USER_ABORT, -EINTR, "KWI"))
654 afs_set_call_complete(call, -EINTR, 0);
655 }
656 }
657
658 spin_lock_bh(&call->state_lock);
659 ac->abort_code = call->abort_code;
660 ac->error = call->error;
661 spin_unlock_bh(&call->state_lock);
662
663 ret = ac->error;
664 switch (ret) {
665 case 0:
666 ret = call->ret0;
667 call->ret0 = 0;
668
669 /* Fall through */
670 case -ECONNABORTED:
671 ac->responded = true;
672 break;
673 }
674
675 out:
676 _debug("call complete");
677 afs_put_call(call);
678 _leave(" = %p", (void *)ret);
679 return ret;
680 }
681
682 /*
683 * wake up a waiting call
684 */
685 static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
686 unsigned long call_user_ID)
687 {
688 struct afs_call *call = (struct afs_call *)call_user_ID;
689
690 call->need_attention = true;
691 wake_up(&call->waitq);
692 }
693
694 /*
695 * wake up an asynchronous call
696 */
697 static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
698 unsigned long call_user_ID)
699 {
700 struct afs_call *call = (struct afs_call *)call_user_ID;
701 int u;
702
703 trace_afs_notify_call(rxcall, call);
704 call->need_attention = true;
705
706 u = atomic_fetch_add_unless(&call->usage, 1, 0);
707 if (u != 0) {
708 trace_afs_call(call, afs_call_trace_wake, u + 1,
709 atomic_read(&call->net->nr_outstanding_calls),
710 __builtin_return_address(0));
711
712 if (!queue_work(afs_async_calls, &call->async_work))
713 afs_put_call(call);
714 }
715 }
716
717 /*
718 * Perform I/O processing on an asynchronous call. The work item carries a ref
719 * to the call struct that we either need to release or to pass on.
720 */
721 static void afs_process_async_call(struct work_struct *work)
722 {
723 struct afs_call *call = container_of(work, struct afs_call, async_work);
724
725 _enter("");
726
727 if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
728 call->need_attention = false;
729 afs_deliver_to_call(call);
730 }
731
732 afs_put_call(call);
733 _leave("");
734 }
735
736 static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
737 {
738 struct afs_call *call = (struct afs_call *)user_call_ID;
739
740 call->rxcall = rxcall;
741 }
742
743 /*
744 * Charge the incoming call preallocation.
745 */
746 void afs_charge_preallocation(struct work_struct *work)
747 {
748 struct afs_net *net =
749 container_of(work, struct afs_net, charge_preallocation_work);
750 struct afs_call *call = net->spare_incoming_call;
751
752 for (;;) {
753 if (!call) {
754 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
755 if (!call)
756 break;
757
758 call->drop_ref = true;
759 call->async = true;
760 call->state = AFS_CALL_SV_AWAIT_OP_ID;
761 init_waitqueue_head(&call->waitq);
762 afs_extract_to_tmp(call);
763 }
764
765 if (rxrpc_kernel_charge_accept(net->socket,
766 afs_wake_up_async_call,
767 afs_rx_attach,
768 (unsigned long)call,
769 GFP_KERNEL,
770 call->debug_id) < 0)
771 break;
772 call = NULL;
773 }
774 net->spare_incoming_call = call;
775 }
776
777 /*
778 * Discard a preallocated call when a socket is shut down.
779 */
780 static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
781 unsigned long user_call_ID)
782 {
783 struct afs_call *call = (struct afs_call *)user_call_ID;
784
785 call->rxcall = NULL;
786 afs_put_call(call);
787 }
788
789 /*
790 * Notification of an incoming call.
791 */
792 static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
793 unsigned long user_call_ID)
794 {
795 struct afs_net *net = afs_sock2net(sk);
796
797 queue_work(afs_wq, &net->charge_preallocation_work);
798 }
799
800 /*
801 * Grab the operation ID from an incoming cache manager call. The socket
802 * buffer is discarded on error or if we don't yet have sufficient data.
803 */
804 static int afs_deliver_cm_op_id(struct afs_call *call)
805 {
806 int ret;
807
808 _enter("{%zu}", iov_iter_count(call->iter));
809
810 /* the operation ID forms the first four bytes of the request data */
811 ret = afs_extract_data(call, true);
812 if (ret < 0)
813 return ret;
814
815 call->operation_ID = ntohl(call->tmp);
816 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
817
818 /* ask the cache manager to route the call (it'll change the call type
819 * if successful) */
820 if (!afs_cm_incoming_call(call))
821 return -ENOTSUPP;
822
823 trace_afs_cb_call(call);
824
825 /* pass responsibility for the remainer of this message off to the
826 * cache manager op */
827 return call->type->deliver(call);
828 }
829
830 /*
831 * Advance the AFS call state when an RxRPC service call ends the transmit
832 * phase.
833 */
834 static void afs_notify_end_reply_tx(struct sock *sock,
835 struct rxrpc_call *rxcall,
836 unsigned long call_user_ID)
837 {
838 struct afs_call *call = (struct afs_call *)call_user_ID;
839
840 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);
841 }
842
843 /*
844 * send an empty reply
845 */
846 void afs_send_empty_reply(struct afs_call *call)
847 {
848 struct afs_net *net = call->net;
849 struct msghdr msg;
850
851 _enter("");
852
853 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);
854
855 msg.msg_name = NULL;
856 msg.msg_namelen = 0;
857 iov_iter_kvec(&msg.msg_iter, WRITE, NULL, 0, 0);
858 msg.msg_control = NULL;
859 msg.msg_controllen = 0;
860 msg.msg_flags = 0;
861
862 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,
863 afs_notify_end_reply_tx)) {
864 case 0:
865 _leave(" [replied]");
866 return;
867
868 case -ENOMEM:
869 _debug("oom");
870 rxrpc_kernel_abort_call(net->socket, call->rxcall,
871 RX_USER_ABORT, -ENOMEM, "KOO");
872 /* Fall through */
873 default:
874 _leave(" [error]");
875 return;
876 }
877 }
878
879 /*
880 * send a simple reply
881 */
882 void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
883 {
884 struct afs_net *net = call->net;
885 struct msghdr msg;
886 struct kvec iov[1];
887 int n;
888
889 _enter("");
890
891 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);
892
893 iov[0].iov_base = (void *) buf;
894 iov[0].iov_len = len;
895 msg.msg_name = NULL;
896 msg.msg_namelen = 0;
897 iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
898 msg.msg_control = NULL;
899 msg.msg_controllen = 0;
900 msg.msg_flags = 0;
901
902 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,
903 afs_notify_end_reply_tx);
904 if (n >= 0) {
905 /* Success */
906 _leave(" [replied]");
907 return;
908 }
909
910 if (n == -ENOMEM) {
911 _debug("oom");
912 rxrpc_kernel_abort_call(net->socket, call->rxcall,
913 RX_USER_ABORT, -ENOMEM, "KOO");
914 }
915 _leave(" [error]");
916 }
917
918 /*
919 * Extract a piece of data from the received data socket buffers.
920 */
921 int afs_extract_data(struct afs_call *call, bool want_more)
922 {
923 struct afs_net *net = call->net;
924 struct iov_iter *iter = call->iter;
925 enum afs_call_state state;
926 u32 remote_abort = 0;
927 int ret;
928
929 _enter("{%s,%zu},%d", call->type->name, iov_iter_count(iter), want_more);
930
931 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
932 want_more, &remote_abort,
933 &call->service_id);
934 if (ret == 0 || ret == -EAGAIN)
935 return ret;
936
937 state = READ_ONCE(call->state);
938 if (ret == 1) {
939 switch (state) {
940 case AFS_CALL_CL_AWAIT_REPLY:
941 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);
942 break;
943 case AFS_CALL_SV_AWAIT_REQUEST:
944 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);
945 break;
946 case AFS_CALL_COMPLETE:
947 kdebug("prem complete %d", call->error);
948 return afs_io_error(call, afs_io_error_extract);
949 default:
950 break;
951 }
952 return 0;
953 }
954
955 afs_set_call_complete(call, ret, remote_abort);
956 return ret;
957 }
958
959 /*
960 * Log protocol error production.
961 */
962 noinline int afs_protocol_error(struct afs_call *call, int error,
963 enum afs_eproto_cause cause)
964 {
965 trace_afs_protocol_error(call, error, cause);
966 return error;
967 }
Linux with added FPC-III support