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mm: assign id to every memcg-aware shrinker
[linux-2.6/btrfs-unstable.git] / fs / afs / rxrpc.c
blob35f2ae30f31f7ffdf6a782cb950120e7b967a9d7
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
12 #include <linux/slab.h>
13 #include <linux/sched/signal.h>
14
15 #include <net/sock.h>
16 #include <net/af_rxrpc.h>
17 #include "internal.h"
18 #include "afs_cm.h"
19
20 struct workqueue_struct *afs_async_calls;
21
22 static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
23 static long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
24 static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
25 static void afs_process_async_call(struct work_struct *);
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);
28 static int afs_deliver_cm_op_id(struct afs_call *);
29
30 /* asynchronous incoming call initial processing */
31 static const struct afs_call_type afs_RXCMxxxx = {
32 .name = "CB.xxxx",
33 .deliver = afs_deliver_cm_op_id,
34 };
35
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 */
40 int afs_open_socket(struct afs_net *net)
41 {
42 struct sockaddr_rxrpc srx;
43 struct socket *socket;
44 unsigned int min_level;
45 int ret;
46
47 _enter("");
48
49 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
50 if (ret < 0)
51 goto error_1;
52
53 socket->sk->sk_allocation = GFP_NOFS;
54
55 /* bind the callback manager's address to make this a server socket */
56 memset(&srx, 0, sizeof(srx));
57 srx.srx_family = AF_RXRPC;
58 srx.srx_service = CM_SERVICE;
59 srx.transport_type = SOCK_DGRAM;
60 srx.transport_len = sizeof(srx.transport.sin6);
61 srx.transport.sin6.sin6_family = AF_INET6;
62 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
63
64 min_level = RXRPC_SECURITY_ENCRYPT;
65 ret = kernel_setsockopt(socket, SOL_RXRPC, RXRPC_MIN_SECURITY_LEVEL,
66 (void *)&min_level, sizeof(min_level));
67 if (ret < 0)
68 goto error_2;
69
70 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
71 if (ret == -EADDRINUSE) {
72 srx.transport.sin6.sin6_port = 0;
73 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
74 }
75 if (ret < 0)
76 goto error_2;
77
78 rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
79 afs_rx_discard_new_call);
80
81 ret = kernel_listen(socket, INT_MAX);
82 if (ret < 0)
83 goto error_2;
84
85 net->socket = socket;
86 afs_charge_preallocation(&net->charge_preallocation_work);
87 _leave(" = 0");
88 return 0;
89
90 error_2:
91 sock_release(socket);
92 error_1:
93 _leave(" = %d", ret);
94 return ret;
95 }
96
97 /*
98 * close the RxRPC socket AFS was using
99 */
100 void afs_close_socket(struct afs_net *net)
101 {
102 _enter("");
103
104 kernel_listen(net->socket, 0);
105 flush_workqueue(afs_async_calls);
106
107 if (net->spare_incoming_call) {
108 afs_put_call(net->spare_incoming_call);
109 net->spare_incoming_call = NULL;
110 }
111
112 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
113 wait_var_event(&net->nr_outstanding_calls,
114 !atomic_read(&net->nr_outstanding_calls));
115 _debug("no outstanding calls");
116
117 kernel_sock_shutdown(net->socket, SHUT_RDWR);
118 flush_workqueue(afs_async_calls);
119 sock_release(net->socket);
120
121 _debug("dework");
122 _leave("");
123 }
124
125 /*
126 * Allocate a call.
127 */
128 static struct afs_call *afs_alloc_call(struct afs_net *net,
129 const struct afs_call_type *type,
130 gfp_t gfp)
131 {
132 struct afs_call *call;
133 int o;
134
135 call = kzalloc(sizeof(*call), gfp);
136 if (!call)
137 return NULL;
138
139 call->type = type;
140 call->net = net;
141 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
142 atomic_set(&call->usage, 1);
143 INIT_WORK(&call->async_work, afs_process_async_call);
144 init_waitqueue_head(&call->waitq);
145 spin_lock_init(&call->state_lock);
146
147 o = atomic_inc_return(&net->nr_outstanding_calls);
148 trace_afs_call(call, afs_call_trace_alloc, 1, o,
149 __builtin_return_address(0));
150 return call;
151 }
152
153 /*
154 * Dispose of a reference on a call.
155 */
156 void afs_put_call(struct afs_call *call)
157 {
158 struct afs_net *net = call->net;
159 int n = atomic_dec_return(&call->usage);
160 int o = atomic_read(&net->nr_outstanding_calls);
161
162 trace_afs_call(call, afs_call_trace_put, n + 1, o,
163 __builtin_return_address(0));
164
165 ASSERTCMP(n, >=, 0);
166 if (n == 0) {
167 ASSERT(!work_pending(&call->async_work));
168 ASSERT(call->type->name != NULL);
169
170 if (call->rxcall) {
171 rxrpc_kernel_end_call(net->socket, call->rxcall);
172 call->rxcall = NULL;
173 }
174 if (call->type->destructor)
175 call->type->destructor(call);
176
177 afs_put_server(call->net, call->cm_server);
178 afs_put_cb_interest(call->net, call->cbi);
179 kfree(call->request);
180
181 trace_afs_call(call, afs_call_trace_free, 0, o,
182 __builtin_return_address(0));
183 kfree(call);
184
185 o = atomic_dec_return(&net->nr_outstanding_calls);
186 if (o == 0)
187 wake_up_var(&net->nr_outstanding_calls);
188 }
189 }
190
191 /*
192 * Queue the call for actual work. Returns 0 unconditionally for convenience.
193 */
194 int afs_queue_call_work(struct afs_call *call)
195 {
196 int u = atomic_inc_return(&call->usage);
197
198 trace_afs_call(call, afs_call_trace_work, u,
199 atomic_read(&call->net->nr_outstanding_calls),
200 __builtin_return_address(0));
201
202 INIT_WORK(&call->work, call->type->work);
203
204 if (!queue_work(afs_wq, &call->work))
205 afs_put_call(call);
206 return 0;
207 }
208
209 /*
210 * allocate a call with flat request and reply buffers
211 */
212 struct afs_call *afs_alloc_flat_call(struct afs_net *net,
213 const struct afs_call_type *type,
214 size_t request_size, size_t reply_max)
215 {
216 struct afs_call *call;
217
218 call = afs_alloc_call(net, type, GFP_NOFS);
219 if (!call)
220 goto nomem_call;
221
222 if (request_size) {
223 call->request_size = request_size;
224 call->request = kmalloc(request_size, GFP_NOFS);
225 if (!call->request)
226 goto nomem_free;
227 }
228
229 if (reply_max) {
230 call->reply_max = reply_max;
231 call->buffer = kmalloc(reply_max, GFP_NOFS);
232 if (!call->buffer)
233 goto nomem_free;
234 }
235
236 call->operation_ID = type->op;
237 init_waitqueue_head(&call->waitq);
238 return call;
239
240 nomem_free:
241 afs_put_call(call);
242 nomem_call:
243 return NULL;
244 }
245
246 /*
247 * clean up a call with flat buffer
248 */
249 void afs_flat_call_destructor(struct afs_call *call)
250 {
251 _enter("");
252
253 kfree(call->request);
254 call->request = NULL;
255 kfree(call->buffer);
256 call->buffer = NULL;
257 }
258
259 #define AFS_BVEC_MAX 8
260
261 /*
262 * Load the given bvec with the next few pages.
263 */
264 static void afs_load_bvec(struct afs_call *call, struct msghdr *msg,
265 struct bio_vec *bv, pgoff_t first, pgoff_t last,
266 unsigned offset)
267 {
268 struct page *pages[AFS_BVEC_MAX];
269 unsigned int nr, n, i, to, bytes = 0;
270
271 nr = min_t(pgoff_t, last - first + 1, AFS_BVEC_MAX);
272 n = find_get_pages_contig(call->mapping, first, nr, pages);
273 ASSERTCMP(n, ==, nr);
274
275 msg->msg_flags |= MSG_MORE;
276 for (i = 0; i < nr; i++) {
277 to = PAGE_SIZE;
278 if (first + i >= last) {
279 to = call->last_to;
280 msg->msg_flags &= ~MSG_MORE;
281 }
282 bv[i].bv_page = pages[i];
283 bv[i].bv_len = to - offset;
284 bv[i].bv_offset = offset;
285 bytes += to - offset;
286 offset = 0;
287 }
288
289 iov_iter_bvec(&msg->msg_iter, WRITE | ITER_BVEC, bv, nr, bytes);
290 }
291
292 /*
293 * Advance the AFS call state when the RxRPC call ends the transmit phase.
294 */
295 static void afs_notify_end_request_tx(struct sock *sock,
296 struct rxrpc_call *rxcall,
297 unsigned long call_user_ID)
298 {
299 struct afs_call *call = (struct afs_call *)call_user_ID;
300
301 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
302 }
303
304 /*
305 * attach the data from a bunch of pages on an inode to a call
306 */
307 static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
308 {
309 struct bio_vec bv[AFS_BVEC_MAX];
310 unsigned int bytes, nr, loop, offset;
311 pgoff_t first = call->first, last = call->last;
312 int ret;
313
314 offset = call->first_offset;
315 call->first_offset = 0;
316
317 do {
318 afs_load_bvec(call, msg, bv, first, last, offset);
319 trace_afs_send_pages(call, msg, first, last, offset);
320
321 offset = 0;
322 bytes = msg->msg_iter.count;
323 nr = msg->msg_iter.nr_segs;
324
325 ret = rxrpc_kernel_send_data(call->net->socket, call->rxcall, msg,
326 bytes, afs_notify_end_request_tx);
327 for (loop = 0; loop < nr; loop++)
328 put_page(bv[loop].bv_page);
329 if (ret < 0)
330 break;
331
332 first += nr;
333 } while (first <= last);
334
335 trace_afs_sent_pages(call, call->first, last, first, ret);
336 return ret;
337 }
338
339 /*
340 * initiate a call
341 */
342 long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
343 gfp_t gfp, bool async)
344 {
345 struct sockaddr_rxrpc *srx = ac->addr;
346 struct rxrpc_call *rxcall;
347 struct msghdr msg;
348 struct kvec iov[1];
349 s64 tx_total_len;
350 int ret;
351
352 _enter(",{%pISp},", &srx->transport);
353
354 ASSERT(call->type != NULL);
355 ASSERT(call->type->name != NULL);
356
357 _debug("____MAKE %p{%s,%x} [%d]____",
358 call, call->type->name, key_serial(call->key),
359 atomic_read(&call->net->nr_outstanding_calls));
360
361 call->async = async;
362
363 /* Work out the length we're going to transmit. This is awkward for
364 * calls such as FS.StoreData where there's an extra injection of data
365 * after the initial fixed part.
366 */
367 tx_total_len = call->request_size;
368 if (call->send_pages) {
369 if (call->last == call->first) {
370 tx_total_len += call->last_to - call->first_offset;
371 } else {
372 /* It looks mathematically like you should be able to
373 * combine the following lines with the ones above, but
374 * unsigned arithmetic is fun when it wraps...
375 */
376 tx_total_len += PAGE_SIZE - call->first_offset;
377 tx_total_len += call->last_to;
378 tx_total_len += (call->last - call->first - 1) * PAGE_SIZE;
379 }
380 }
381
382 /* create a call */
383 rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
384 (unsigned long)call,
385 tx_total_len, gfp,
386 (async ?
387 afs_wake_up_async_call :
388 afs_wake_up_call_waiter),
389 call->upgrade,
390 call->debug_id);
391 if (IS_ERR(rxcall)) {
392 ret = PTR_ERR(rxcall);
393 goto error_kill_call;
394 }
395
396 call->rxcall = rxcall;
397
398 /* send the request */
399 iov[0].iov_base = call->request;
400 iov[0].iov_len = call->request_size;
401
402 msg.msg_name = NULL;
403 msg.msg_namelen = 0;
404 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1,
405 call->request_size);
406 msg.msg_control = NULL;
407 msg.msg_controllen = 0;
408 msg.msg_flags = MSG_WAITALL | (call->send_pages ? MSG_MORE : 0);
409
410 ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
411 &msg, call->request_size,
412 afs_notify_end_request_tx);
413 if (ret < 0)
414 goto error_do_abort;
415
416 if (call->send_pages) {
417 ret = afs_send_pages(call, &msg);
418 if (ret < 0)
419 goto error_do_abort;
420 }
421
422 /* at this point, an async call may no longer exist as it may have
423 * already completed */
424 if (call->async)
425 return -EINPROGRESS;
426
427 return afs_wait_for_call_to_complete(call, ac);
428
429 error_do_abort:
430 call->state = AFS_CALL_COMPLETE;
431 if (ret != -ECONNABORTED) {
432 rxrpc_kernel_abort_call(call->net->socket, rxcall,
433 RX_USER_ABORT, ret, "KSD");
434 } else {
435 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, NULL, 0, 0);
436 rxrpc_kernel_recv_data(call->net->socket, rxcall,
437 &msg.msg_iter, false,
438 &call->abort_code, &call->service_id);
439 ac->abort_code = call->abort_code;
440 ac->responded = true;
441 }
442 call->error = ret;
443 trace_afs_call_done(call);
444 error_kill_call:
445 afs_put_call(call);
446 ac->error = ret;
447 _leave(" = %d", ret);
448 return ret;
449 }
450
451 /*
452 * deliver messages to a call
453 */
454 static void afs_deliver_to_call(struct afs_call *call)
455 {
456 enum afs_call_state state;
457 u32 abort_code, remote_abort = 0;
458 int ret;
459
460 _enter("%s", call->type->name);
461
462 while (state = READ_ONCE(call->state),
463 state == AFS_CALL_CL_AWAIT_REPLY ||
464 state == AFS_CALL_SV_AWAIT_OP_ID ||
465 state == AFS_CALL_SV_AWAIT_REQUEST ||
466 state == AFS_CALL_SV_AWAIT_ACK
467 ) {
468 if (state == AFS_CALL_SV_AWAIT_ACK) {
469 struct iov_iter iter;
470
471 iov_iter_kvec(&iter, READ | ITER_KVEC, NULL, 0, 0);
472 ret = rxrpc_kernel_recv_data(call->net->socket,
473 call->rxcall, &iter, false,
474 &remote_abort,
475 &call->service_id);
476 trace_afs_recv_data(call, 0, 0, false, ret);
477
478 if (ret == -EINPROGRESS || ret == -EAGAIN)
479 return;
480 if (ret < 0 || ret == 1) {
481 if (ret == 1)
482 ret = 0;
483 goto call_complete;
484 }
485 return;
486 }
487
488 ret = call->type->deliver(call);
489 state = READ_ONCE(call->state);
490 switch (ret) {
491 case 0:
492 if (state == AFS_CALL_CL_PROC_REPLY) {
493 if (call->cbi)
494 set_bit(AFS_SERVER_FL_MAY_HAVE_CB,
495 &call->cbi->server->flags);
496 goto call_complete;
497 }
498 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);
499 goto done;
500 case -EINPROGRESS:
501 case -EAGAIN:
502 goto out;
503 case -EIO:
504 case -ECONNABORTED:
505 ASSERTCMP(state, ==, AFS_CALL_COMPLETE);
506 goto done;
507 case -ENOTSUPP:
508 abort_code = RXGEN_OPCODE;
509 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
510 abort_code, ret, "KIV");
511 goto local_abort;
512 case -ENODATA:
513 case -EBADMSG:
514 case -EMSGSIZE:
515 default:
516 abort_code = RXGEN_CC_UNMARSHAL;
517 if (state != AFS_CALL_CL_AWAIT_REPLY)
518 abort_code = RXGEN_SS_UNMARSHAL;
519 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
520 abort_code, -EBADMSG, "KUM");
521 goto local_abort;
522 }
523 }
524
525 done:
526 if (state == AFS_CALL_COMPLETE && call->incoming)
527 afs_put_call(call);
528 out:
529 _leave("");
530 return;
531
532 local_abort:
533 abort_code = 0;
534 call_complete:
535 afs_set_call_complete(call, ret, remote_abort);
536 state = AFS_CALL_COMPLETE;
537 goto done;
538 }
539
540 /*
541 * wait synchronously for a call to complete
542 */
543 static long afs_wait_for_call_to_complete(struct afs_call *call,
544 struct afs_addr_cursor *ac)
545 {
546 signed long rtt2, timeout;
547 long ret;
548 u64 rtt;
549 u32 life, last_life;
550
551 DECLARE_WAITQUEUE(myself, current);
552
553 _enter("");
554
555 rtt = rxrpc_kernel_get_rtt(call->net->socket, call->rxcall);
556 rtt2 = nsecs_to_jiffies64(rtt) * 2;
557 if (rtt2 < 2)
558 rtt2 = 2;
559
560 timeout = rtt2;
561 last_life = rxrpc_kernel_check_life(call->net->socket, call->rxcall);
562
563 add_wait_queue(&call->waitq, &myself);
564 for (;;) {
565 set_current_state(TASK_UNINTERRUPTIBLE);
566
567 /* deliver any messages that are in the queue */
568 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
569 call->need_attention) {
570 call->need_attention = false;
571 __set_current_state(TASK_RUNNING);
572 afs_deliver_to_call(call);
573 continue;
574 }
575
576 if (afs_check_call_state(call, AFS_CALL_COMPLETE))
577 break;
578
579 life = rxrpc_kernel_check_life(call->net->socket, call->rxcall);
580 if (timeout == 0 &&
581 life == last_life && signal_pending(current))
582 break;
583
584 if (life != last_life) {
585 timeout = rtt2;
586 last_life = life;
587 }
588
589 timeout = schedule_timeout(timeout);
590 }
591
592 remove_wait_queue(&call->waitq, &myself);
593 __set_current_state(TASK_RUNNING);
594
595 /* Kill off the call if it's still live. */
596 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
597 _debug("call interrupted");
598 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
599 RX_USER_ABORT, -EINTR, "KWI"))
600 afs_set_call_complete(call, -EINTR, 0);
601 }
602
603 spin_lock_bh(&call->state_lock);
604 ac->abort_code = call->abort_code;
605 ac->error = call->error;
606 spin_unlock_bh(&call->state_lock);
607
608 ret = ac->error;
609 switch (ret) {
610 case 0:
611 if (call->ret_reply0) {
612 ret = (long)call->reply[0];
613 call->reply[0] = NULL;
614 }
615 /* Fall through */
616 case -ECONNABORTED:
617 ac->responded = true;
618 break;
619 }
620
621 _debug("call complete");
622 afs_put_call(call);
623 _leave(" = %p", (void *)ret);
624 return ret;
625 }
626
627 /*
628 * wake up a waiting call
629 */
630 static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
631 unsigned long call_user_ID)
632 {
633 struct afs_call *call = (struct afs_call *)call_user_ID;
634
635 call->need_attention = true;
636 wake_up(&call->waitq);
637 }
638
639 /*
640 * wake up an asynchronous call
641 */
642 static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
643 unsigned long call_user_ID)
644 {
645 struct afs_call *call = (struct afs_call *)call_user_ID;
646 int u;
647
648 trace_afs_notify_call(rxcall, call);
649 call->need_attention = true;
650
651 u = atomic_fetch_add_unless(&call->usage, 1, 0);
652 if (u != 0) {
653 trace_afs_call(call, afs_call_trace_wake, u,
654 atomic_read(&call->net->nr_outstanding_calls),
655 __builtin_return_address(0));
656
657 if (!queue_work(afs_async_calls, &call->async_work))
658 afs_put_call(call);
659 }
660 }
661
662 /*
663 * Delete an asynchronous call. The work item carries a ref to the call struct
664 * that we need to release.
665 */
666 static void afs_delete_async_call(struct work_struct *work)
667 {
668 struct afs_call *call = container_of(work, struct afs_call, async_work);
669
670 _enter("");
671
672 afs_put_call(call);
673
674 _leave("");
675 }
676
677 /*
678 * Perform I/O processing on an asynchronous call. The work item carries a ref
679 * to the call struct that we either need to release or to pass on.
680 */
681 static void afs_process_async_call(struct work_struct *work)
682 {
683 struct afs_call *call = container_of(work, struct afs_call, async_work);
684
685 _enter("");
686
687 if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
688 call->need_attention = false;
689 afs_deliver_to_call(call);
690 }
691
692 if (call->state == AFS_CALL_COMPLETE) {
693 call->reply[0] = NULL;
694
695 /* We have two refs to release - one from the alloc and one
696 * queued with the work item - and we can't just deallocate the
697 * call because the work item may be queued again.
698 */
699 call->async_work.func = afs_delete_async_call;
700 if (!queue_work(afs_async_calls, &call->async_work))
701 afs_put_call(call);
702 }
703
704 afs_put_call(call);
705 _leave("");
706 }
707
708 static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
709 {
710 struct afs_call *call = (struct afs_call *)user_call_ID;
711
712 call->rxcall = rxcall;
713 }
714
715 /*
716 * Charge the incoming call preallocation.
717 */
718 void afs_charge_preallocation(struct work_struct *work)
719 {
720 struct afs_net *net =
721 container_of(work, struct afs_net, charge_preallocation_work);
722 struct afs_call *call = net->spare_incoming_call;
723
724 for (;;) {
725 if (!call) {
726 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
727 if (!call)
728 break;
729
730 call->async = true;
731 call->state = AFS_CALL_SV_AWAIT_OP_ID;
732 init_waitqueue_head(&call->waitq);
733 }
734
735 if (rxrpc_kernel_charge_accept(net->socket,
736 afs_wake_up_async_call,
737 afs_rx_attach,
738 (unsigned long)call,
739 GFP_KERNEL,
740 call->debug_id) < 0)
741 break;
742 call = NULL;
743 }
744 net->spare_incoming_call = call;
745 }
746
747 /*
748 * Discard a preallocated call when a socket is shut down.
749 */
750 static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
751 unsigned long user_call_ID)
752 {
753 struct afs_call *call = (struct afs_call *)user_call_ID;
754
755 call->rxcall = NULL;
756 afs_put_call(call);
757 }
758
759 /*
760 * Notification of an incoming call.
761 */
762 static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
763 unsigned long user_call_ID)
764 {
765 struct afs_net *net = afs_sock2net(sk);
766
767 queue_work(afs_wq, &net->charge_preallocation_work);
768 }
769
770 /*
771 * Grab the operation ID from an incoming cache manager call. The socket
772 * buffer is discarded on error or if we don't yet have sufficient data.
773 */
774 static int afs_deliver_cm_op_id(struct afs_call *call)
775 {
776 int ret;
777
778 _enter("{%zu}", call->offset);
779
780 ASSERTCMP(call->offset, <, 4);
781
782 /* the operation ID forms the first four bytes of the request data */
783 ret = afs_extract_data(call, &call->tmp, 4, true);
784 if (ret < 0)
785 return ret;
786
787 call->operation_ID = ntohl(call->tmp);
788 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
789 call->offset = 0;
790
791 /* ask the cache manager to route the call (it'll change the call type
792 * if successful) */
793 if (!afs_cm_incoming_call(call))
794 return -ENOTSUPP;
795
796 trace_afs_cb_call(call);
797
798 /* pass responsibility for the remainer of this message off to the
799 * cache manager op */
800 return call->type->deliver(call);
801 }
802
803 /*
804 * Advance the AFS call state when an RxRPC service call ends the transmit
805 * phase.
806 */
807 static void afs_notify_end_reply_tx(struct sock *sock,
808 struct rxrpc_call *rxcall,
809 unsigned long call_user_ID)
810 {
811 struct afs_call *call = (struct afs_call *)call_user_ID;
812
813 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);
814 }
815
816 /*
817 * send an empty reply
818 */
819 void afs_send_empty_reply(struct afs_call *call)
820 {
821 struct afs_net *net = call->net;
822 struct msghdr msg;
823
824 _enter("");
825
826 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);
827
828 msg.msg_name = NULL;
829 msg.msg_namelen = 0;
830 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
831 msg.msg_control = NULL;
832 msg.msg_controllen = 0;
833 msg.msg_flags = 0;
834
835 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,
836 afs_notify_end_reply_tx)) {
837 case 0:
838 _leave(" [replied]");
839 return;
840
841 case -ENOMEM:
842 _debug("oom");
843 rxrpc_kernel_abort_call(net->socket, call->rxcall,
844 RX_USER_ABORT, -ENOMEM, "KOO");
845 default:
846 _leave(" [error]");
847 return;
848 }
849 }
850
851 /*
852 * send a simple reply
853 */
854 void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
855 {
856 struct afs_net *net = call->net;
857 struct msghdr msg;
858 struct kvec iov[1];
859 int n;
860
861 _enter("");
862
863 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);
864
865 iov[0].iov_base = (void *) buf;
866 iov[0].iov_len = len;
867 msg.msg_name = NULL;
868 msg.msg_namelen = 0;
869 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len);
870 msg.msg_control = NULL;
871 msg.msg_controllen = 0;
872 msg.msg_flags = 0;
873
874 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,
875 afs_notify_end_reply_tx);
876 if (n >= 0) {
877 /* Success */
878 _leave(" [replied]");
879 return;
880 }
881
882 if (n == -ENOMEM) {
883 _debug("oom");
884 rxrpc_kernel_abort_call(net->socket, call->rxcall,
885 RX_USER_ABORT, -ENOMEM, "KOO");
886 }
887 _leave(" [error]");
888 }
889
890 /*
891 * Extract a piece of data from the received data socket buffers.
892 */
893 int afs_extract_data(struct afs_call *call, void *buf, size_t count,
894 bool want_more)
895 {
896 struct afs_net *net = call->net;
897 struct iov_iter iter;
898 struct kvec iov;
899 enum afs_call_state state;
900 u32 remote_abort = 0;
901 int ret;
902
903 _enter("{%s,%zu},,%zu,%d",
904 call->type->name, call->offset, count, want_more);
905
906 ASSERTCMP(call->offset, <=, count);
907
908 iov.iov_base = buf + call->offset;
909 iov.iov_len = count - call->offset;
910 iov_iter_kvec(&iter, ITER_KVEC | READ, &iov, 1, count - call->offset);
911
912 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, &iter,
913 want_more, &remote_abort,
914 &call->service_id);
915 call->offset += (count - call->offset) - iov_iter_count(&iter);
916 trace_afs_recv_data(call, count, call->offset, want_more, ret);
917 if (ret == 0 || ret == -EAGAIN)
918 return ret;
919
920 state = READ_ONCE(call->state);
921 if (ret == 1) {
922 switch (state) {
923 case AFS_CALL_CL_AWAIT_REPLY:
924 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);
925 break;
926 case AFS_CALL_SV_AWAIT_REQUEST:
927 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);
928 break;
929 case AFS_CALL_COMPLETE:
930 kdebug("prem complete %d", call->error);
931 return -EIO;
932 default:
933 break;
934 }
935 return 0;
936 }
937
938 afs_set_call_complete(call, ret, remote_abort);
939 return ret;
940 }
941
942 /*
943 * Log protocol error production.
944 */
945 noinline int afs_protocol_error(struct afs_call *call, int error)
946 {
947 trace_afs_protocol_error(call, error, __builtin_return_address(0));
948 return error;
949 }
(deprecated) Btrfs devel tree