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 *);
27 static void SRXAFSCB_CallBack(struct work_struct *);
28 static void SRXAFSCB_InitCallBackState(struct work_struct *);
29 static void SRXAFSCB_Probe(struct work_struct *);
30 static void SRXAFSCB_ProbeUuid(struct work_struct *);
31 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
33 #define CM_NAME(name) \
34 const char afs_SRXCB##name##_name[] __tracepoint_string = \
38 * CB.CallBack operation type
40 static CM_NAME(CallBack);
41 static const struct afs_call_type afs_SRXCBCallBack = {
42 .name = afs_SRXCBCallBack_name,
43 .deliver = afs_deliver_cb_callback,
44 .abort_to_error = afs_abort_to_error,
45 .destructor = afs_cm_destructor,
46 .work = SRXAFSCB_CallBack,
50 * CB.InitCallBackState operation type
52 static CM_NAME(InitCallBackState);
53 static const struct afs_call_type afs_SRXCBInitCallBackState = {
54 .name = afs_SRXCBInitCallBackState_name,
55 .deliver = afs_deliver_cb_init_call_back_state,
56 .abort_to_error = afs_abort_to_error,
57 .destructor = afs_cm_destructor,
58 .work = SRXAFSCB_InitCallBackState,
62 * CB.InitCallBackState3 operation type
64 static CM_NAME(InitCallBackState3);
65 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
66 .name = afs_SRXCBInitCallBackState3_name,
67 .deliver = afs_deliver_cb_init_call_back_state3,
68 .abort_to_error = afs_abort_to_error,
69 .destructor = afs_cm_destructor,
70 .work = SRXAFSCB_InitCallBackState,
74 * CB.Probe operation type
76 static CM_NAME(Probe);
77 static const struct afs_call_type afs_SRXCBProbe = {
78 .name = afs_SRXCBProbe_name,
79 .deliver = afs_deliver_cb_probe,
80 .abort_to_error = afs_abort_to_error,
81 .destructor = afs_cm_destructor,
82 .work = SRXAFSCB_Probe,
86 * CB.ProbeUuid operation type
88 static CM_NAME(ProbeUuid);
89 static const struct afs_call_type afs_SRXCBProbeUuid = {
90 .name = afs_SRXCBProbeUuid_name,
91 .deliver = afs_deliver_cb_probe_uuid,
92 .abort_to_error = afs_abort_to_error,
93 .destructor = afs_cm_destructor,
94 .work = SRXAFSCB_ProbeUuid,
98 * CB.TellMeAboutYourself operation type
100 static CM_NAME(TellMeAboutYourself);
101 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
102 .name = afs_SRXCBTellMeAboutYourself_name,
103 .deliver = afs_deliver_cb_tell_me_about_yourself,
104 .abort_to_error = afs_abort_to_error,
105 .destructor = afs_cm_destructor,
106 .work = SRXAFSCB_TellMeAboutYourself,
110 * route an incoming cache manager call
111 * - return T if supported, F if not
113 bool afs_cm_incoming_call(struct afs_call *call)
115 _enter("{CB.OP %u}", call->operation_ID);
117 switch (call->operation_ID) {
119 call->type = &afs_SRXCBCallBack;
121 case CBInitCallBackState:
122 call->type = &afs_SRXCBInitCallBackState;
124 case CBInitCallBackState3:
125 call->type = &afs_SRXCBInitCallBackState3;
128 call->type = &afs_SRXCBProbe;
130 case CBTellMeAboutYourself:
131 call->type = &afs_SRXCBTellMeAboutYourself;
139 * clean up a cache manager call
141 static void afs_cm_destructor(struct afs_call *call)
145 /* Break the callbacks here so that we do it after the final ACK is
146 * received. The step number here must match the final number in
147 * afs_deliver_cb_callback().
149 if (call->unmarshall == 5) {
150 ASSERT(call->server && call->count && call->request);
151 afs_break_callbacks(call->server, call->count, call->request);
154 afs_put_server(call->server);
161 * allow the fileserver to see if the cache manager is still alive
163 static void SRXAFSCB_CallBack(struct work_struct *work)
165 struct afs_call *call = container_of(work, struct afs_call, work);
169 /* be sure to send the reply *before* attempting to spam the AFS server
170 * with FSFetchStatus requests on the vnodes with broken callbacks lest
171 * the AFS server get into a vicious cycle of trying to break further
172 * callbacks because it hadn't received completion of the CBCallBack op
174 afs_send_empty_reply(call);
176 afs_break_callbacks(call->server, call->count, call->request);
182 * deliver request data to a CB.CallBack call
184 static int afs_deliver_cb_callback(struct afs_call *call)
186 struct sockaddr_rxrpc srx;
187 struct afs_callback *cb;
188 struct afs_server *server;
192 _enter("{%u}", call->unmarshall);
194 switch (call->unmarshall) {
196 rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
200 /* extract the FID array and its count in two steps */
202 _debug("extract FID count");
203 ret = afs_extract_data(call, &call->tmp, 4, true);
207 call->count = ntohl(call->tmp);
208 _debug("FID count: %u", call->count);
209 if (call->count > AFSCBMAX)
212 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
219 _debug("extract FID array");
220 ret = afs_extract_data(call, call->buffer,
221 call->count * 3 * 4, true);
225 _debug("unmarshall FID array");
226 call->request = kcalloc(call->count,
227 sizeof(struct afs_callback),
234 for (loop = call->count; loop > 0; loop--, cb++) {
235 cb->fid.vid = ntohl(*bp++);
236 cb->fid.vnode = ntohl(*bp++);
237 cb->fid.unique = ntohl(*bp++);
238 cb->type = AFSCM_CB_UNTYPED;
244 /* extract the callback array and its count in two steps */
246 _debug("extract CB count");
247 ret = afs_extract_data(call, &call->tmp, 4, true);
251 call->count2 = ntohl(call->tmp);
252 _debug("CB count: %u", call->count2);
253 if (call->count2 != call->count && call->count2 != 0)
259 _debug("extract CB array");
260 ret = afs_extract_data(call, call->buffer,
261 call->count2 * 3 * 4, false);
265 _debug("unmarshall CB array");
268 for (loop = call->count2; loop > 0; loop--, cb++) {
269 cb->version = ntohl(*bp++);
270 cb->expiry = ntohl(*bp++);
271 cb->type = ntohl(*bp++);
277 /* Record that the message was unmarshalled successfully so
278 * that the call destructor can know do the callback breaking
279 * work, even if the final ACK isn't received.
281 * If the step number changes, then afs_cm_destructor() must be
289 call->state = AFS_CALL_REPLYING;
291 /* we'll need the file server record as that tells us which set of
292 * vnodes to operate upon */
293 server = afs_find_server(&srx);
296 call->server = server;
298 return afs_queue_call_work(call);
302 * allow the fileserver to request callback state (re-)initialisation
304 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
306 struct afs_call *call = container_of(work, struct afs_call, work);
308 _enter("{%p}", call->server);
310 afs_init_callback_state(call->server);
311 afs_send_empty_reply(call);
317 * deliver request data to a CB.InitCallBackState call
319 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
321 struct sockaddr_rxrpc srx;
322 struct afs_server *server;
327 rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
329 ret = afs_extract_data(call, NULL, 0, false);
333 /* no unmarshalling required */
334 call->state = AFS_CALL_REPLYING;
336 /* we'll need the file server record as that tells us which set of
337 * vnodes to operate upon */
338 server = afs_find_server(&srx);
341 call->server = server;
343 return afs_queue_call_work(call);
347 * deliver request data to a CB.InitCallBackState3 call
349 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
351 struct sockaddr_rxrpc srx;
352 struct afs_server *server;
360 rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
362 _enter("{%u}", call->unmarshall);
364 switch (call->unmarshall) {
367 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
373 _debug("extract UUID");
374 ret = afs_extract_data(call, call->buffer,
375 11 * sizeof(__be32), false);
378 case -EAGAIN: return 0;
382 _debug("unmarshall UUID");
383 call->request = kmalloc(sizeof(struct uuid_v1), GFP_KERNEL);
390 r->time_mid = htons(ntohl(b[1]));
391 r->time_hi_and_version = htons(ntohl(b[2]));
392 r->clock_seq_hi_and_reserved = ntohl(b[3]);
393 r->clock_seq_low = ntohl(b[4]);
395 for (loop = 0; loop < 6; loop++)
396 r->node[loop] = ntohl(b[loop + 5]);
405 /* no unmarshalling required */
406 call->state = AFS_CALL_REPLYING;
408 /* we'll need the file server record as that tells us which set of
409 * vnodes to operate upon */
410 server = afs_find_server(&srx);
413 call->server = server;
415 return afs_queue_call_work(call);
419 * allow the fileserver to see if the cache manager is still alive
421 static void SRXAFSCB_Probe(struct work_struct *work)
423 struct afs_call *call = container_of(work, struct afs_call, work);
426 afs_send_empty_reply(call);
432 * deliver request data to a CB.Probe call
434 static int afs_deliver_cb_probe(struct afs_call *call)
440 ret = afs_extract_data(call, NULL, 0, false);
444 /* no unmarshalling required */
445 call->state = AFS_CALL_REPLYING;
447 return afs_queue_call_work(call);
451 * allow the fileserver to quickly find out if the fileserver has been rebooted
453 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
455 struct afs_call *call = container_of(work, struct afs_call, work);
456 struct uuid_v1 *r = call->request;
464 if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
465 reply.match = htonl(0);
467 reply.match = htonl(1);
469 afs_send_simple_reply(call, &reply, sizeof(reply));
475 * deliver request data to a CB.ProbeUuid call
477 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
484 _enter("{%u}", call->unmarshall);
486 switch (call->unmarshall) {
489 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
495 _debug("extract UUID");
496 ret = afs_extract_data(call, call->buffer,
497 11 * sizeof(__be32), false);
500 case -EAGAIN: return 0;
504 _debug("unmarshall UUID");
505 call->request = kmalloc(sizeof(struct uuid_v1), GFP_KERNEL);
512 r->time_mid = htons(ntohl(b[1]));
513 r->time_hi_and_version = htons(ntohl(b[2]));
514 r->clock_seq_hi_and_reserved = ntohl(b[3]);
515 r->clock_seq_low = ntohl(b[4]);
517 for (loop = 0; loop < 6; loop++)
518 r->node[loop] = ntohl(b[loop + 5]);
527 call->state = AFS_CALL_REPLYING;
529 return afs_queue_call_work(call);
533 * allow the fileserver to ask about the cache manager's capabilities
535 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
537 struct afs_interface *ifs;
538 struct afs_call *call = container_of(work, struct afs_call, work);
542 struct /* InterfaceAddr */ {
549 struct /* Capabilities */ {
558 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
560 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
568 memset(&reply, 0, sizeof(reply));
569 reply.ia.nifs = htonl(nifs);
571 reply.ia.uuid[0] = afs_uuid.time_low;
572 reply.ia.uuid[1] = htonl(ntohs(afs_uuid.time_mid));
573 reply.ia.uuid[2] = htonl(ntohs(afs_uuid.time_hi_and_version));
574 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
575 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
576 for (loop = 0; loop < 6; loop++)
577 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
580 for (loop = 0; loop < nifs; loop++) {
581 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
582 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
583 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
588 reply.cap.capcount = htonl(1);
589 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
590 afs_send_simple_reply(call, &reply, sizeof(reply));
596 * deliver request data to a CB.TellMeAboutYourself call
598 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
604 ret = afs_extract_data(call, NULL, 0, false);
608 /* no unmarshalling required */
609 call->state = AFS_CALL_REPLYING;
611 return afs_queue_call_work(call);