1 /* AFS Cache Manager Service
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/sched.h>
20 static int afs_deliver_cb_init_call_back_state(struct afs_call *);
21 static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
22 static int afs_deliver_cb_probe(struct afs_call *);
23 static int afs_deliver_cb_callback(struct afs_call *);
24 static int afs_deliver_cb_probe_uuid(struct afs_call *);
25 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
26 static void afs_cm_destructor(struct afs_call *);
29 * CB.CallBack operation type
31 static const struct afs_call_type afs_SRXCBCallBack = {
32 .name = "CB.CallBack",
33 .deliver = afs_deliver_cb_callback,
34 .abort_to_error = afs_abort_to_error,
35 .destructor = afs_cm_destructor,
39 * CB.InitCallBackState operation type
41 static const struct afs_call_type afs_SRXCBInitCallBackState = {
42 .name = "CB.InitCallBackState",
43 .deliver = afs_deliver_cb_init_call_back_state,
44 .abort_to_error = afs_abort_to_error,
45 .destructor = afs_cm_destructor,
49 * CB.InitCallBackState3 operation type
51 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
52 .name = "CB.InitCallBackState3",
53 .deliver = afs_deliver_cb_init_call_back_state3,
54 .abort_to_error = afs_abort_to_error,
55 .destructor = afs_cm_destructor,
59 * CB.Probe operation type
61 static const struct afs_call_type afs_SRXCBProbe = {
63 .deliver = afs_deliver_cb_probe,
64 .abort_to_error = afs_abort_to_error,
65 .destructor = afs_cm_destructor,
69 * CB.ProbeUuid operation type
71 static const struct afs_call_type afs_SRXCBProbeUuid = {
72 .name = "CB.ProbeUuid",
73 .deliver = afs_deliver_cb_probe_uuid,
74 .abort_to_error = afs_abort_to_error,
75 .destructor = afs_cm_destructor,
79 * CB.TellMeAboutYourself operation type
81 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
82 .name = "CB.TellMeAboutYourself",
83 .deliver = afs_deliver_cb_tell_me_about_yourself,
84 .abort_to_error = afs_abort_to_error,
85 .destructor = afs_cm_destructor,
89 * route an incoming cache manager call
90 * - return T if supported, F if not
92 bool afs_cm_incoming_call(struct afs_call *call)
94 _enter("{CB.OP %u}", call->operation_ID);
96 switch (call->operation_ID) {
98 call->type = &afs_SRXCBCallBack;
100 case CBInitCallBackState:
101 call->type = &afs_SRXCBInitCallBackState;
103 case CBInitCallBackState3:
104 call->type = &afs_SRXCBInitCallBackState3;
107 call->type = &afs_SRXCBProbe;
110 call->type = &afs_SRXCBProbeUuid;
112 case CBTellMeAboutYourself:
113 call->type = &afs_SRXCBTellMeAboutYourself;
121 * clean up a cache manager call
123 static void afs_cm_destructor(struct afs_call *call)
127 /* Break the callbacks here so that we do it after the final ACK is
128 * received. The step number here must match the final number in
129 * afs_deliver_cb_callback().
131 if (call->unmarshall == 5) {
132 ASSERT(call->server && call->count && call->request);
133 afs_break_callbacks(call->server, call->count, call->request);
136 afs_put_server(call->server);
143 * allow the fileserver to see if the cache manager is still alive
145 static void SRXAFSCB_CallBack(struct work_struct *work)
147 struct afs_call *call = container_of(work, struct afs_call, work);
151 /* be sure to send the reply *before* attempting to spam the AFS server
152 * with FSFetchStatus requests on the vnodes with broken callbacks lest
153 * the AFS server get into a vicious cycle of trying to break further
154 * callbacks because it hadn't received completion of the CBCallBack op
156 afs_send_empty_reply(call);
158 afs_break_callbacks(call->server, call->count, call->request);
163 * deliver request data to a CB.CallBack call
165 static int afs_deliver_cb_callback(struct afs_call *call)
167 struct sockaddr_rxrpc srx;
168 struct afs_callback *cb;
169 struct afs_server *server;
173 _enter("{%u}", call->unmarshall);
175 switch (call->unmarshall) {
177 rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
181 /* extract the FID array and its count in two steps */
183 _debug("extract FID count");
184 ret = afs_extract_data(call, &call->tmp, 4, true);
188 call->count = ntohl(call->tmp);
189 _debug("FID count: %u", call->count);
190 if (call->count > AFSCBMAX)
193 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
200 _debug("extract FID array");
201 ret = afs_extract_data(call, call->buffer,
202 call->count * 3 * 4, true);
206 _debug("unmarshall FID array");
207 call->request = kcalloc(call->count,
208 sizeof(struct afs_callback),
215 for (loop = call->count; loop > 0; loop--, cb++) {
216 cb->fid.vid = ntohl(*bp++);
217 cb->fid.vnode = ntohl(*bp++);
218 cb->fid.unique = ntohl(*bp++);
219 cb->type = AFSCM_CB_UNTYPED;
225 /* extract the callback array and its count in two steps */
227 _debug("extract CB count");
228 ret = afs_extract_data(call, &call->tmp, 4, true);
232 call->count2 = ntohl(call->tmp);
233 _debug("CB count: %u", call->count2);
234 if (call->count2 != call->count && call->count2 != 0)
240 _debug("extract CB array");
241 ret = afs_extract_data(call, call->buffer,
242 call->count2 * 3 * 4, false);
246 _debug("unmarshall CB array");
249 for (loop = call->count2; loop > 0; loop--, cb++) {
250 cb->version = ntohl(*bp++);
251 cb->expiry = ntohl(*bp++);
252 cb->type = ntohl(*bp++);
258 /* Record that the message was unmarshalled successfully so
259 * that the call destructor can know do the callback breaking
260 * work, even if the final ACK isn't received.
262 * If the step number changes, then afs_cm_destructor() must be
270 call->state = AFS_CALL_REPLYING;
272 /* we'll need the file server record as that tells us which set of
273 * vnodes to operate upon */
274 server = afs_find_server(&srx);
277 call->server = server;
279 INIT_WORK(&call->work, SRXAFSCB_CallBack);
280 queue_work(afs_wq, &call->work);
285 * allow the fileserver to request callback state (re-)initialisation
287 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
289 struct afs_call *call = container_of(work, struct afs_call, work);
291 _enter("{%p}", call->server);
293 afs_init_callback_state(call->server);
294 afs_send_empty_reply(call);
299 * deliver request data to a CB.InitCallBackState call
301 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
303 struct sockaddr_rxrpc srx;
304 struct afs_server *server;
309 rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
311 ret = afs_extract_data(call, NULL, 0, false);
315 /* no unmarshalling required */
316 call->state = AFS_CALL_REPLYING;
318 /* we'll need the file server record as that tells us which set of
319 * vnodes to operate upon */
320 server = afs_find_server(&srx);
323 call->server = server;
325 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
326 queue_work(afs_wq, &call->work);
331 * deliver request data to a CB.InitCallBackState3 call
333 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
335 struct sockaddr_rxrpc srx;
336 struct afs_server *server;
344 rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
346 _enter("{%u}", call->unmarshall);
348 switch (call->unmarshall) {
351 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
357 _debug("extract UUID");
358 ret = afs_extract_data(call, call->buffer,
359 11 * sizeof(__be32), false);
362 case -EAGAIN: return 0;
366 _debug("unmarshall UUID");
367 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
373 r->time_low = ntohl(b[0]);
374 r->time_mid = ntohl(b[1]);
375 r->time_hi_and_version = ntohl(b[2]);
376 r->clock_seq_hi_and_reserved = ntohl(b[3]);
377 r->clock_seq_low = ntohl(b[4]);
379 for (loop = 0; loop < 6; loop++)
380 r->node[loop] = ntohl(b[loop + 5]);
389 /* no unmarshalling required */
390 call->state = AFS_CALL_REPLYING;
392 /* we'll need the file server record as that tells us which set of
393 * vnodes to operate upon */
394 server = afs_find_server(&srx);
397 call->server = server;
399 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
400 queue_work(afs_wq, &call->work);
405 * allow the fileserver to see if the cache manager is still alive
407 static void SRXAFSCB_Probe(struct work_struct *work)
409 struct afs_call *call = container_of(work, struct afs_call, work);
412 afs_send_empty_reply(call);
417 * deliver request data to a CB.Probe call
419 static int afs_deliver_cb_probe(struct afs_call *call)
425 ret = afs_extract_data(call, NULL, 0, false);
429 /* no unmarshalling required */
430 call->state = AFS_CALL_REPLYING;
432 INIT_WORK(&call->work, SRXAFSCB_Probe);
433 queue_work(afs_wq, &call->work);
438 * allow the fileserver to quickly find out if the fileserver has been rebooted
440 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
442 struct afs_call *call = container_of(work, struct afs_call, work);
443 struct afs_uuid *r = call->request;
451 if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
452 reply.match = htonl(0);
454 reply.match = htonl(1);
456 afs_send_simple_reply(call, &reply, sizeof(reply));
461 * deliver request data to a CB.ProbeUuid call
463 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
470 _enter("{%u}", call->unmarshall);
472 switch (call->unmarshall) {
475 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
481 _debug("extract UUID");
482 ret = afs_extract_data(call, call->buffer,
483 11 * sizeof(__be32), false);
486 case -EAGAIN: return 0;
490 _debug("unmarshall UUID");
491 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
497 r->time_low = ntohl(b[0]);
498 r->time_mid = ntohl(b[1]);
499 r->time_hi_and_version = ntohl(b[2]);
500 r->clock_seq_hi_and_reserved = ntohl(b[3]);
501 r->clock_seq_low = ntohl(b[4]);
503 for (loop = 0; loop < 6; loop++)
504 r->node[loop] = ntohl(b[loop + 5]);
513 call->state = AFS_CALL_REPLYING;
515 INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
516 queue_work(afs_wq, &call->work);
521 * allow the fileserver to ask about the cache manager's capabilities
523 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
525 struct afs_interface *ifs;
526 struct afs_call *call = container_of(work, struct afs_call, work);
530 struct /* InterfaceAddr */ {
537 struct /* Capabilities */ {
546 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
548 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
556 memset(&reply, 0, sizeof(reply));
557 reply.ia.nifs = htonl(nifs);
559 reply.ia.uuid[0] = htonl(afs_uuid.time_low);
560 reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
561 reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
562 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
563 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
564 for (loop = 0; loop < 6; loop++)
565 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
568 for (loop = 0; loop < nifs; loop++) {
569 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
570 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
571 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
576 reply.cap.capcount = htonl(1);
577 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
578 afs_send_simple_reply(call, &reply, sizeof(reply));
584 * deliver request data to a CB.TellMeAboutYourself call
586 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
592 ret = afs_extract_data(call, NULL, 0, false);
596 /* no unmarshalling required */
597 call->state = AFS_CALL_REPLYING;
599 INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
600 queue_work(afs_wq, &call->work);