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[MIPS] Fix fallocate on o32 binary compat ABI
[linux-2.6/mini2440.git] / fs / afs / rxrpc.c
blob8ccee9ee1d9d0dbfb66f851ed0f50ae811c3f354
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 <net/sock.h>
13 #include <net/af_rxrpc.h>
14 #include <rxrpc/packet.h>
15 #include "internal.h"
16 #include "afs_cm.h"
17
18 static struct socket *afs_socket; /* my RxRPC socket */
19 static struct workqueue_struct *afs_async_calls;
20 static atomic_t afs_outstanding_calls;
21 static atomic_t afs_outstanding_skbs;
22
23 static void afs_wake_up_call_waiter(struct afs_call *);
24 static int afs_wait_for_call_to_complete(struct afs_call *);
25 static void afs_wake_up_async_call(struct afs_call *);
26 static int afs_dont_wait_for_call_to_complete(struct afs_call *);
27 static void afs_process_async_call(struct work_struct *);
28 static void afs_rx_interceptor(struct sock *, unsigned long, struct sk_buff *);
29 static int afs_deliver_cm_op_id(struct afs_call *, struct sk_buff *, bool);
30
31 /* synchronous call management */
32 const struct afs_wait_mode afs_sync_call = {
33 .rx_wakeup = afs_wake_up_call_waiter,
34 .wait = afs_wait_for_call_to_complete,
35 };
36
37 /* asynchronous call management */
38 const struct afs_wait_mode afs_async_call = {
39 .rx_wakeup = afs_wake_up_async_call,
40 .wait = afs_dont_wait_for_call_to_complete,
41 };
42
43 /* asynchronous incoming call management */
44 static const struct afs_wait_mode afs_async_incoming_call = {
45 .rx_wakeup = afs_wake_up_async_call,
46 };
47
48 /* asynchronous incoming call initial processing */
49 static const struct afs_call_type afs_RXCMxxxx = {
50 .name = "CB.xxxx",
51 .deliver = afs_deliver_cm_op_id,
52 .abort_to_error = afs_abort_to_error,
53 };
54
55 static void afs_collect_incoming_call(struct work_struct *);
56
57 static struct sk_buff_head afs_incoming_calls;
58 static DECLARE_WORK(afs_collect_incoming_call_work, afs_collect_incoming_call);
59
60 /*
61 * open an RxRPC socket and bind it to be a server for callback notifications
62 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
63 */
64 int afs_open_socket(void)
65 {
66 struct sockaddr_rxrpc srx;
67 struct socket *socket;
68 int ret;
69
70 _enter("");
71
72 skb_queue_head_init(&afs_incoming_calls);
73
74 afs_async_calls = create_singlethread_workqueue("kafsd");
75 if (!afs_async_calls) {
76 _leave(" = -ENOMEM [wq]");
77 return -ENOMEM;
78 }
79
80 ret = sock_create_kern(AF_RXRPC, SOCK_DGRAM, PF_INET, &socket);
81 if (ret < 0) {
82 destroy_workqueue(afs_async_calls);
83 _leave(" = %d [socket]", ret);
84 return ret;
85 }
86
87 socket->sk->sk_allocation = GFP_NOFS;
88
89 /* bind the callback manager's address to make this a server socket */
90 srx.srx_family = AF_RXRPC;
91 srx.srx_service = CM_SERVICE;
92 srx.transport_type = SOCK_DGRAM;
93 srx.transport_len = sizeof(srx.transport.sin);
94 srx.transport.sin.sin_family = AF_INET;
95 srx.transport.sin.sin_port = htons(AFS_CM_PORT);
96 memset(&srx.transport.sin.sin_addr, 0,
97 sizeof(srx.transport.sin.sin_addr));
98
99 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
100 if (ret < 0) {
101 sock_release(socket);
102 _leave(" = %d [bind]", ret);
103 return ret;
104 }
105
106 rxrpc_kernel_intercept_rx_messages(socket, afs_rx_interceptor);
107
108 afs_socket = socket;
109 _leave(" = 0");
110 return 0;
111 }
112
113 /*
114 * close the RxRPC socket AFS was using
115 */
116 void afs_close_socket(void)
117 {
118 _enter("");
119
120 sock_release(afs_socket);
121
122 _debug("dework");
123 destroy_workqueue(afs_async_calls);
124
125 ASSERTCMP(atomic_read(&afs_outstanding_skbs), ==, 0);
126 ASSERTCMP(atomic_read(&afs_outstanding_calls), ==, 0);
127 _leave("");
128 }
129
130 /*
131 * note that the data in a socket buffer is now delivered and that the buffer
132 * should be freed
133 */
134 static void afs_data_delivered(struct sk_buff *skb)
135 {
136 if (!skb) {
137 _debug("DLVR NULL [%d]", atomic_read(&afs_outstanding_skbs));
138 dump_stack();
139 } else {
140 _debug("DLVR %p{%u} [%d]",
141 skb, skb->mark, atomic_read(&afs_outstanding_skbs));
142 if (atomic_dec_return(&afs_outstanding_skbs) == -1)
143 BUG();
144 rxrpc_kernel_data_delivered(skb);
145 }
146 }
147
148 /*
149 * free a socket buffer
150 */
151 static void afs_free_skb(struct sk_buff *skb)
152 {
153 if (!skb) {
154 _debug("FREE NULL [%d]", atomic_read(&afs_outstanding_skbs));
155 dump_stack();
156 } else {
157 _debug("FREE %p{%u} [%d]",
158 skb, skb->mark, atomic_read(&afs_outstanding_skbs));
159 if (atomic_dec_return(&afs_outstanding_skbs) == -1)
160 BUG();
161 rxrpc_kernel_free_skb(skb);
162 }
163 }
164
165 /*
166 * free a call
167 */
168 static void afs_free_call(struct afs_call *call)
169 {
170 _debug("DONE %p{%s} [%d]",
171 call, call->type->name, atomic_read(&afs_outstanding_calls));
172 if (atomic_dec_return(&afs_outstanding_calls) == -1)
173 BUG();
174
175 ASSERTCMP(call->rxcall, ==, NULL);
176 ASSERT(!work_pending(&call->async_work));
177 ASSERT(skb_queue_empty(&call->rx_queue));
178 ASSERT(call->type->name != NULL);
179
180 kfree(call->request);
181 kfree(call);
182 }
183
184 /*
185 * allocate a call with flat request and reply buffers
186 */
187 struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
188 size_t request_size, size_t reply_size)
189 {
190 struct afs_call *call;
191
192 call = kzalloc(sizeof(*call), GFP_NOFS);
193 if (!call)
194 goto nomem_call;
195
196 _debug("CALL %p{%s} [%d]",
197 call, type->name, atomic_read(&afs_outstanding_calls));
198 atomic_inc(&afs_outstanding_calls);
199
200 call->type = type;
201 call->request_size = request_size;
202 call->reply_max = reply_size;
203
204 if (request_size) {
205 call->request = kmalloc(request_size, GFP_NOFS);
206 if (!call->request)
207 goto nomem_free;
208 }
209
210 if (reply_size) {
211 call->buffer = kmalloc(reply_size, GFP_NOFS);
212 if (!call->buffer)
213 goto nomem_free;
214 }
215
216 init_waitqueue_head(&call->waitq);
217 skb_queue_head_init(&call->rx_queue);
218 return call;
219
220 nomem_free:
221 afs_free_call(call);
222 nomem_call:
223 return NULL;
224 }
225
226 /*
227 * clean up a call with flat buffer
228 */
229 void afs_flat_call_destructor(struct afs_call *call)
230 {
231 _enter("");
232
233 kfree(call->request);
234 call->request = NULL;
235 kfree(call->buffer);
236 call->buffer = NULL;
237 }
238
239 /*
240 * attach the data from a bunch of pages on an inode to a call
241 */
242 int afs_send_pages(struct afs_call *call, struct msghdr *msg, struct kvec *iov)
243 {
244 struct page *pages[8];
245 unsigned count, n, loop, offset, to;
246 pgoff_t first = call->first, last = call->last;
247 int ret;
248
249 _enter("");
250
251 offset = call->first_offset;
252 call->first_offset = 0;
253
254 do {
255 _debug("attach %lx-%lx", first, last);
256
257 count = last - first + 1;
258 if (count > ARRAY_SIZE(pages))
259 count = ARRAY_SIZE(pages);
260 n = find_get_pages_contig(call->mapping, first, count, pages);
261 ASSERTCMP(n, ==, count);
262
263 loop = 0;
264 do {
265 msg->msg_flags = 0;
266 to = PAGE_SIZE;
267 if (first + loop >= last)
268 to = call->last_to;
269 else
270 msg->msg_flags = MSG_MORE;
271 iov->iov_base = kmap(pages[loop]) + offset;
272 iov->iov_len = to - offset;
273 offset = 0;
274
275 _debug("- range %u-%u%s",
276 offset, to, msg->msg_flags ? " [more]" : "");
277 msg->msg_iov = (struct iovec *) iov;
278 msg->msg_iovlen = 1;
279
280 /* have to change the state *before* sending the last
281 * packet as RxRPC might give us the reply before it
282 * returns from sending the request */
283 if (first + loop >= last)
284 call->state = AFS_CALL_AWAIT_REPLY;
285 ret = rxrpc_kernel_send_data(call->rxcall, msg,
286 to - offset);
287 kunmap(pages[loop]);
288 if (ret < 0)
289 break;
290 } while (++loop < count);
291 first += count;
292
293 for (loop = 0; loop < count; loop++)
294 put_page(pages[loop]);
295 if (ret < 0)
296 break;
297 } while (first <= last);
298
299 _leave(" = %d", ret);
300 return ret;
301 }
302
303 /*
304 * initiate a call
305 */
306 int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
307 const struct afs_wait_mode *wait_mode)
308 {
309 struct sockaddr_rxrpc srx;
310 struct rxrpc_call *rxcall;
311 struct msghdr msg;
312 struct kvec iov[1];
313 int ret;
314
315 _enter("%x,{%d},", addr->s_addr, ntohs(call->port));
316
317 ASSERT(call->type != NULL);
318 ASSERT(call->type->name != NULL);
319
320 _debug("____MAKE %p{%s,%x} [%d]____",
321 call, call->type->name, key_serial(call->key),
322 atomic_read(&afs_outstanding_calls));
323
324 call->wait_mode = wait_mode;
325 INIT_WORK(&call->async_work, afs_process_async_call);
326
327 memset(&srx, 0, sizeof(srx));
328 srx.srx_family = AF_RXRPC;
329 srx.srx_service = call->service_id;
330 srx.transport_type = SOCK_DGRAM;
331 srx.transport_len = sizeof(srx.transport.sin);
332 srx.transport.sin.sin_family = AF_INET;
333 srx.transport.sin.sin_port = call->port;
334 memcpy(&srx.transport.sin.sin_addr, addr, 4);
335
336 /* create a call */
337 rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key,
338 (unsigned long) call, gfp);
339 call->key = NULL;
340 if (IS_ERR(rxcall)) {
341 ret = PTR_ERR(rxcall);
342 goto error_kill_call;
343 }
344
345 call->rxcall = rxcall;
346
347 /* send the request */
348 iov[0].iov_base = call->request;
349 iov[0].iov_len = call->request_size;
350
351 msg.msg_name = NULL;
352 msg.msg_namelen = 0;
353 msg.msg_iov = (struct iovec *) iov;
354 msg.msg_iovlen = 1;
355 msg.msg_control = NULL;
356 msg.msg_controllen = 0;
357 msg.msg_flags = (call->send_pages ? MSG_MORE : 0);
358
359 /* have to change the state *before* sending the last packet as RxRPC
360 * might give us the reply before it returns from sending the
361 * request */
362 if (!call->send_pages)
363 call->state = AFS_CALL_AWAIT_REPLY;
364 ret = rxrpc_kernel_send_data(rxcall, &msg, call->request_size);
365 if (ret < 0)
366 goto error_do_abort;
367
368 if (call->send_pages) {
369 ret = afs_send_pages(call, &msg, iov);
370 if (ret < 0)
371 goto error_do_abort;
372 }
373
374 /* at this point, an async call may no longer exist as it may have
375 * already completed */
376 return wait_mode->wait(call);
377
378 error_do_abort:
379 rxrpc_kernel_abort_call(rxcall, RX_USER_ABORT);
380 rxrpc_kernel_end_call(rxcall);
381 call->rxcall = NULL;
382 error_kill_call:
383 call->type->destructor(call);
384 afs_free_call(call);
385 _leave(" = %d", ret);
386 return ret;
387 }
388
389 /*
390 * handles intercepted messages that were arriving in the socket's Rx queue
391 * - called with the socket receive queue lock held to ensure message ordering
392 * - called with softirqs disabled
393 */
394 static void afs_rx_interceptor(struct sock *sk, unsigned long user_call_ID,
395 struct sk_buff *skb)
396 {
397 struct afs_call *call = (struct afs_call *) user_call_ID;
398
399 _enter("%p,,%u", call, skb->mark);
400
401 _debug("ICPT %p{%u} [%d]",
402 skb, skb->mark, atomic_read(&afs_outstanding_skbs));
403
404 ASSERTCMP(sk, ==, afs_socket->sk);
405 atomic_inc(&afs_outstanding_skbs);
406
407 if (!call) {
408 /* its an incoming call for our callback service */
409 skb_queue_tail(&afs_incoming_calls, skb);
410 schedule_work(&afs_collect_incoming_call_work);
411 } else {
412 /* route the messages directly to the appropriate call */
413 skb_queue_tail(&call->rx_queue, skb);
414 call->wait_mode->rx_wakeup(call);
415 }
416
417 _leave("");
418 }
419
420 /*
421 * deliver messages to a call
422 */
423 static void afs_deliver_to_call(struct afs_call *call)
424 {
425 struct sk_buff *skb;
426 bool last;
427 u32 abort_code;
428 int ret;
429
430 _enter("");
431
432 while ((call->state == AFS_CALL_AWAIT_REPLY ||
433 call->state == AFS_CALL_AWAIT_OP_ID ||
434 call->state == AFS_CALL_AWAIT_REQUEST ||
435 call->state == AFS_CALL_AWAIT_ACK) &&
436 (skb = skb_dequeue(&call->rx_queue))) {
437 switch (skb->mark) {
438 case RXRPC_SKB_MARK_DATA:
439 _debug("Rcv DATA");
440 last = rxrpc_kernel_is_data_last(skb);
441 ret = call->type->deliver(call, skb, last);
442 switch (ret) {
443 case 0:
444 if (last &&
445 call->state == AFS_CALL_AWAIT_REPLY)
446 call->state = AFS_CALL_COMPLETE;
447 break;
448 case -ENOTCONN:
449 abort_code = RX_CALL_DEAD;
450 goto do_abort;
451 case -ENOTSUPP:
452 abort_code = RX_INVALID_OPERATION;
453 goto do_abort;
454 default:
455 abort_code = RXGEN_CC_UNMARSHAL;
456 if (call->state != AFS_CALL_AWAIT_REPLY)
457 abort_code = RXGEN_SS_UNMARSHAL;
458 do_abort:
459 rxrpc_kernel_abort_call(call->rxcall,
460 abort_code);
461 call->error = ret;
462 call->state = AFS_CALL_ERROR;
463 break;
464 }
465 afs_data_delivered(skb);
466 skb = NULL;
467 continue;
468 case RXRPC_SKB_MARK_FINAL_ACK:
469 _debug("Rcv ACK");
470 call->state = AFS_CALL_COMPLETE;
471 break;
472 case RXRPC_SKB_MARK_BUSY:
473 _debug("Rcv BUSY");
474 call->error = -EBUSY;
475 call->state = AFS_CALL_BUSY;
476 break;
477 case RXRPC_SKB_MARK_REMOTE_ABORT:
478 abort_code = rxrpc_kernel_get_abort_code(skb);
479 call->error = call->type->abort_to_error(abort_code);
480 call->state = AFS_CALL_ABORTED;
481 _debug("Rcv ABORT %u -> %d", abort_code, call->error);
482 break;
483 case RXRPC_SKB_MARK_NET_ERROR:
484 call->error = -rxrpc_kernel_get_error_number(skb);
485 call->state = AFS_CALL_ERROR;
486 _debug("Rcv NET ERROR %d", call->error);
487 break;
488 case RXRPC_SKB_MARK_LOCAL_ERROR:
489 call->error = -rxrpc_kernel_get_error_number(skb);
490 call->state = AFS_CALL_ERROR;
491 _debug("Rcv LOCAL ERROR %d", call->error);
492 break;
493 default:
494 BUG();
495 break;
496 }
497
498 afs_free_skb(skb);
499 }
500
501 /* make sure the queue is empty if the call is done with (we might have
502 * aborted the call early because of an unmarshalling error) */
503 if (call->state >= AFS_CALL_COMPLETE) {
504 while ((skb = skb_dequeue(&call->rx_queue)))
505 afs_free_skb(skb);
506 if (call->incoming) {
507 rxrpc_kernel_end_call(call->rxcall);
508 call->rxcall = NULL;
509 call->type->destructor(call);
510 afs_free_call(call);
511 }
512 }
513
514 _leave("");
515 }
516
517 /*
518 * wait synchronously for a call to complete
519 */
520 static int afs_wait_for_call_to_complete(struct afs_call *call)
521 {
522 struct sk_buff *skb;
523 int ret;
524
525 DECLARE_WAITQUEUE(myself, current);
526
527 _enter("");
528
529 add_wait_queue(&call->waitq, &myself);
530 for (;;) {
531 set_current_state(TASK_INTERRUPTIBLE);
532
533 /* deliver any messages that are in the queue */
534 if (!skb_queue_empty(&call->rx_queue)) {
535 __set_current_state(TASK_RUNNING);
536 afs_deliver_to_call(call);
537 continue;
538 }
539
540 ret = call->error;
541 if (call->state >= AFS_CALL_COMPLETE)
542 break;
543 ret = -EINTR;
544 if (signal_pending(current))
545 break;
546 schedule();
547 }
548
549 remove_wait_queue(&call->waitq, &myself);
550 __set_current_state(TASK_RUNNING);
551
552 /* kill the call */
553 if (call->state < AFS_CALL_COMPLETE) {
554 _debug("call incomplete");
555 rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD);
556 while ((skb = skb_dequeue(&call->rx_queue)))
557 afs_free_skb(skb);
558 }
559
560 _debug("call complete");
561 rxrpc_kernel_end_call(call->rxcall);
562 call->rxcall = NULL;
563 call->type->destructor(call);
564 afs_free_call(call);
565 _leave(" = %d", ret);
566 return ret;
567 }
568
569 /*
570 * wake up a waiting call
571 */
572 static void afs_wake_up_call_waiter(struct afs_call *call)
573 {
574 wake_up(&call->waitq);
575 }
576
577 /*
578 * wake up an asynchronous call
579 */
580 static void afs_wake_up_async_call(struct afs_call *call)
581 {
582 _enter("");
583 queue_work(afs_async_calls, &call->async_work);
584 }
585
586 /*
587 * put a call into asynchronous mode
588 * - mustn't touch the call descriptor as the call my have completed by the
589 * time we get here
590 */
591 static int afs_dont_wait_for_call_to_complete(struct afs_call *call)
592 {
593 _enter("");
594 return -EINPROGRESS;
595 }
596
597 /*
598 * delete an asynchronous call
599 */
600 static void afs_delete_async_call(struct work_struct *work)
601 {
602 struct afs_call *call =
603 container_of(work, struct afs_call, async_work);
604
605 _enter("");
606
607 afs_free_call(call);
608
609 _leave("");
610 }
611
612 /*
613 * perform processing on an asynchronous call
614 * - on a multiple-thread workqueue this work item may try to run on several
615 * CPUs at the same time
616 */
617 static void afs_process_async_call(struct work_struct *work)
618 {
619 struct afs_call *call =
620 container_of(work, struct afs_call, async_work);
621
622 _enter("");
623
624 if (!skb_queue_empty(&call->rx_queue))
625 afs_deliver_to_call(call);
626
627 if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) {
628 if (call->wait_mode->async_complete)
629 call->wait_mode->async_complete(call->reply,
630 call->error);
631 call->reply = NULL;
632
633 /* kill the call */
634 rxrpc_kernel_end_call(call->rxcall);
635 call->rxcall = NULL;
636 if (call->type->destructor)
637 call->type->destructor(call);
638
639 /* we can't just delete the call because the work item may be
640 * queued */
641 PREPARE_WORK(&call->async_work, afs_delete_async_call);
642 queue_work(afs_async_calls, &call->async_work);
643 }
644
645 _leave("");
646 }
647
648 /*
649 * empty a socket buffer into a flat reply buffer
650 */
651 void afs_transfer_reply(struct afs_call *call, struct sk_buff *skb)
652 {
653 size_t len = skb->len;
654
655 if (skb_copy_bits(skb, 0, call->buffer + call->reply_size, len) < 0)
656 BUG();
657 call->reply_size += len;
658 }
659
660 /*
661 * accept the backlog of incoming calls
662 */
663 static void afs_collect_incoming_call(struct work_struct *work)
664 {
665 struct rxrpc_call *rxcall;
666 struct afs_call *call = NULL;
667 struct sk_buff *skb;
668
669 while ((skb = skb_dequeue(&afs_incoming_calls))) {
670 _debug("new call");
671
672 /* don't need the notification */
673 afs_free_skb(skb);
674
675 if (!call) {
676 call = kzalloc(sizeof(struct afs_call), GFP_KERNEL);
677 if (!call) {
678 rxrpc_kernel_reject_call(afs_socket);
679 return;
680 }
681
682 INIT_WORK(&call->async_work, afs_process_async_call);
683 call->wait_mode = &afs_async_incoming_call;
684 call->type = &afs_RXCMxxxx;
685 init_waitqueue_head(&call->waitq);
686 skb_queue_head_init(&call->rx_queue);
687 call->state = AFS_CALL_AWAIT_OP_ID;
688
689 _debug("CALL %p{%s} [%d]",
690 call, call->type->name,
691 atomic_read(&afs_outstanding_calls));
692 atomic_inc(&afs_outstanding_calls);
693 }
694
695 rxcall = rxrpc_kernel_accept_call(afs_socket,
696 (unsigned long) call);
697 if (!IS_ERR(rxcall)) {
698 call->rxcall = rxcall;
699 call = NULL;
700 }
701 }
702
703 if (call)
704 afs_free_call(call);
705 }
706
707 /*
708 * grab the operation ID from an incoming cache manager call
709 */
710 static int afs_deliver_cm_op_id(struct afs_call *call, struct sk_buff *skb,
711 bool last)
712 {
713 size_t len = skb->len;
714 void *oibuf = (void *) &call->operation_ID;
715
716 _enter("{%u},{%zu},%d", call->offset, len, last);
717
718 ASSERTCMP(call->offset, <, 4);
719
720 /* the operation ID forms the first four bytes of the request data */
721 len = min_t(size_t, len, 4 - call->offset);
722 if (skb_copy_bits(skb, 0, oibuf + call->offset, len) < 0)
723 BUG();
724 if (!pskb_pull(skb, len))
725 BUG();
726 call->offset += len;
727
728 if (call->offset < 4) {
729 if (last) {
730 _leave(" = -EBADMSG [op ID short]");
731 return -EBADMSG;
732 }
733 _leave(" = 0 [incomplete]");
734 return 0;
735 }
736
737 call->state = AFS_CALL_AWAIT_REQUEST;
738
739 /* ask the cache manager to route the call (it'll change the call type
740 * if successful) */
741 if (!afs_cm_incoming_call(call))
742 return -ENOTSUPP;
743
744 /* pass responsibility for the remainer of this message off to the
745 * cache manager op */
746 return call->type->deliver(call, skb, last);
747 }
748
749 /*
750 * send an empty reply
751 */
752 void afs_send_empty_reply(struct afs_call *call)
753 {
754 struct msghdr msg;
755 struct iovec iov[1];
756
757 _enter("");
758
759 iov[0].iov_base = NULL;
760 iov[0].iov_len = 0;
761 msg.msg_name = NULL;
762 msg.msg_namelen = 0;
763 msg.msg_iov = iov;
764 msg.msg_iovlen = 0;
765 msg.msg_control = NULL;
766 msg.msg_controllen = 0;
767 msg.msg_flags = 0;
768
769 call->state = AFS_CALL_AWAIT_ACK;
770 switch (rxrpc_kernel_send_data(call->rxcall, &msg, 0)) {
771 case 0:
772 _leave(" [replied]");
773 return;
774
775 case -ENOMEM:
776 _debug("oom");
777 rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT);
778 default:
779 rxrpc_kernel_end_call(call->rxcall);
780 call->rxcall = NULL;
781 call->type->destructor(call);
782 afs_free_call(call);
783 _leave(" [error]");
784 return;
785 }
786 }
787
788 /*
789 * send a simple reply
790 */
791 void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
792 {
793 struct msghdr msg;
794 struct iovec iov[1];
795 int n;
796
797 _enter("");
798
799 iov[0].iov_base = (void *) buf;
800 iov[0].iov_len = len;
801 msg.msg_name = NULL;
802 msg.msg_namelen = 0;
803 msg.msg_iov = iov;
804 msg.msg_iovlen = 1;
805 msg.msg_control = NULL;
806 msg.msg_controllen = 0;
807 msg.msg_flags = 0;
808
809 call->state = AFS_CALL_AWAIT_ACK;
810 n = rxrpc_kernel_send_data(call->rxcall, &msg, len);
811 if (n >= 0) {
812 _leave(" [replied]");
813 return;
814 }
815 if (n == -ENOMEM) {
816 _debug("oom");
817 rxrpc_kernel_abort_call(call->rxcall, RX_USER_ABORT);
818 }
819 rxrpc_kernel_end_call(call->rxcall);
820 call->rxcall = NULL;
821 call->type->destructor(call);
822 afs_free_call(call);
823 _leave(" [error]");
824 }
825
826 /*
827 * extract a piece of data from the received data socket buffers
828 */
829 int afs_extract_data(struct afs_call *call, struct sk_buff *skb,
830 bool last, void *buf, size_t count)
831 {
832 size_t len = skb->len;
833
834 _enter("{%u},{%zu},%d,,%zu", call->offset, len, last, count);
835
836 ASSERTCMP(call->offset, <, count);
837
838 len = min_t(size_t, len, count - call->offset);
839 if (skb_copy_bits(skb, 0, buf + call->offset, len) < 0 ||
840 !pskb_pull(skb, len))
841 BUG();
842 call->offset += len;
843
844 if (call->offset < count) {
845 if (last) {
846 _leave(" = -EBADMSG [%d < %zu]", call->offset, count);
847 return -EBADMSG;
848 }
849 _leave(" = -EAGAIN");
850 return -EAGAIN;
851 }
852 return 0;
853 }
Support for the Chinese Samsung S3C2440 based development boards