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>
21 struct workqueue_struct *afs_cm_workqueue;
24 static int afs_deliver_cb_init_call_back_state(struct afs_call *,
25 struct sk_buff *, bool);
26 static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
27 struct sk_buff *, bool);
28 static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
29 static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
30 static int afs_deliver_cb_probe_uuid(struct afs_call *, struct sk_buff *, bool);
31 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *,
32 struct sk_buff *, bool);
33 static void afs_cm_destructor(struct afs_call *);
36 * CB.CallBack operation type
38 static const struct afs_call_type afs_SRXCBCallBack = {
39 .name = "CB.CallBack",
40 .deliver = afs_deliver_cb_callback,
41 .abort_to_error = afs_abort_to_error,
42 .destructor = afs_cm_destructor,
46 * CB.InitCallBackState operation type
48 static const struct afs_call_type afs_SRXCBInitCallBackState = {
49 .name = "CB.InitCallBackState",
50 .deliver = afs_deliver_cb_init_call_back_state,
51 .abort_to_error = afs_abort_to_error,
52 .destructor = afs_cm_destructor,
56 * CB.InitCallBackState3 operation type
58 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
59 .name = "CB.InitCallBackState3",
60 .deliver = afs_deliver_cb_init_call_back_state3,
61 .abort_to_error = afs_abort_to_error,
62 .destructor = afs_cm_destructor,
66 * CB.Probe operation type
68 static const struct afs_call_type afs_SRXCBProbe = {
70 .deliver = afs_deliver_cb_probe,
71 .abort_to_error = afs_abort_to_error,
72 .destructor = afs_cm_destructor,
76 * CB.ProbeUuid operation type
78 static const struct afs_call_type afs_SRXCBProbeUuid = {
79 .name = "CB.ProbeUuid",
80 .deliver = afs_deliver_cb_probe_uuid,
81 .abort_to_error = afs_abort_to_error,
82 .destructor = afs_cm_destructor,
86 * CB.TellMeAboutYourself operation type
88 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
89 .name = "CB.TellMeAboutYourself",
90 .deliver = afs_deliver_cb_tell_me_about_yourself,
91 .abort_to_error = afs_abort_to_error,
92 .destructor = afs_cm_destructor,
96 * route an incoming cache manager call
97 * - return T if supported, F if not
99 bool afs_cm_incoming_call(struct afs_call *call)
101 u32 operation_id = ntohl(call->operation_ID);
103 _enter("{CB.OP %u}", operation_id);
105 switch (operation_id) {
107 call->type = &afs_SRXCBCallBack;
109 case CBInitCallBackState:
110 call->type = &afs_SRXCBInitCallBackState;
112 case CBInitCallBackState3:
113 call->type = &afs_SRXCBInitCallBackState3;
116 call->type = &afs_SRXCBProbe;
118 case CBTellMeAboutYourself:
119 call->type = &afs_SRXCBTellMeAboutYourself;
127 * clean up a cache manager call
129 static void afs_cm_destructor(struct afs_call *call)
133 afs_put_server(call->server);
140 * allow the fileserver to see if the cache manager is still alive
142 static void SRXAFSCB_CallBack(struct work_struct *work)
144 struct afs_call *call = container_of(work, struct afs_call, work);
148 /* be sure to send the reply *before* attempting to spam the AFS server
149 * with FSFetchStatus requests on the vnodes with broken callbacks lest
150 * the AFS server get into a vicious cycle of trying to break further
151 * callbacks because it hadn't received completion of the CBCallBack op
153 afs_send_empty_reply(call);
155 afs_break_callbacks(call->server, call->count, call->request);
160 * deliver request data to a CB.CallBack call
162 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
165 struct afs_callback *cb;
166 struct afs_server *server;
172 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
174 switch (call->unmarshall) {
179 /* extract the FID array and its count in two steps */
181 _debug("extract FID count");
182 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
185 case -EAGAIN: return 0;
189 call->count = ntohl(call->tmp);
190 _debug("FID count: %u", call->count);
191 if (call->count > AFSCBMAX)
194 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
201 _debug("extract FID array");
202 ret = afs_extract_data(call, skb, last, call->buffer,
203 call->count * 3 * 4);
206 case -EAGAIN: return 0;
210 _debug("unmarshall FID array");
211 call->request = kcalloc(call->count,
212 sizeof(struct afs_callback),
219 for (loop = call->count; loop > 0; loop--, cb++) {
220 cb->fid.vid = ntohl(*bp++);
221 cb->fid.vnode = ntohl(*bp++);
222 cb->fid.unique = ntohl(*bp++);
223 cb->type = AFSCM_CB_UNTYPED;
229 /* extract the callback array and its count in two steps */
231 _debug("extract CB count");
232 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
235 case -EAGAIN: return 0;
239 tmp = ntohl(call->tmp);
240 _debug("CB count: %u", tmp);
241 if (tmp != call->count && tmp != 0)
249 _debug("extract CB array");
250 ret = afs_extract_data(call, skb, last, call->request,
251 call->count * 3 * 4);
254 case -EAGAIN: return 0;
258 _debug("unmarshall CB array");
261 for (loop = call->count; loop > 0; loop--, cb++) {
262 cb->version = ntohl(*bp++);
263 cb->expiry = ntohl(*bp++);
264 cb->type = ntohl(*bp++);
281 call->state = AFS_CALL_REPLYING;
283 /* we'll need the file server record as that tells us which set of
284 * vnodes to operate upon */
285 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
286 server = afs_find_server(&addr);
289 call->server = server;
291 INIT_WORK(&call->work, SRXAFSCB_CallBack);
292 queue_work(afs_wq, &call->work);
297 * allow the fileserver to request callback state (re-)initialisation
299 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
301 struct afs_call *call = container_of(work, struct afs_call, work);
303 _enter("{%p}", call->server);
305 afs_init_callback_state(call->server);
306 afs_send_empty_reply(call);
311 * deliver request data to a CB.InitCallBackState call
313 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
317 struct afs_server *server;
320 _enter(",{%u},%d", skb->len, last);
327 /* no unmarshalling required */
328 call->state = AFS_CALL_REPLYING;
330 /* we'll need the file server record as that tells us which set of
331 * vnodes to operate upon */
332 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
333 server = afs_find_server(&addr);
336 call->server = server;
338 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
339 queue_work(afs_wq, &call->work);
344 * deliver request data to a CB.InitCallBackState3 call
346 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
350 struct afs_server *server;
353 _enter(",{%u},%d", skb->len, last);
358 /* no unmarshalling required */
359 call->state = AFS_CALL_REPLYING;
361 /* we'll need the file server record as that tells us which set of
362 * vnodes to operate upon */
363 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
364 server = afs_find_server(&addr);
367 call->server = server;
369 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
370 queue_work(afs_wq, &call->work);
375 * allow the fileserver to see if the cache manager is still alive
377 static void SRXAFSCB_Probe(struct work_struct *work)
379 struct afs_call *call = container_of(work, struct afs_call, work);
382 afs_send_empty_reply(call);
387 * deliver request data to a CB.Probe call
389 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
392 _enter(",{%u},%d", skb->len, last);
399 /* no unmarshalling required */
400 call->state = AFS_CALL_REPLYING;
402 INIT_WORK(&call->work, SRXAFSCB_Probe);
403 queue_work(afs_wq, &call->work);
408 * allow the fileserver to quickly find out if the fileserver has been rebooted
410 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
412 struct afs_call *call = container_of(work, struct afs_call, work);
413 struct afs_uuid *r = call->request;
422 if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
423 reply.match = htonl(0);
425 reply.match = htonl(1);
427 afs_send_simple_reply(call, &reply, sizeof(reply));
432 * deliver request data to a CB.ProbeUuid call
434 static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
442 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
449 switch (call->unmarshall) {
452 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
458 _debug("extract UUID");
459 ret = afs_extract_data(call, skb, last, call->buffer,
460 11 * sizeof(__be32));
463 case -EAGAIN: return 0;
467 _debug("unmarshall UUID");
468 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
474 r->time_low = ntohl(b[0]);
475 r->time_mid = ntohl(b[1]);
476 r->time_hi_and_version = ntohl(b[2]);
477 r->clock_seq_hi_and_reserved = ntohl(b[3]);
478 r->clock_seq_low = ntohl(b[4]);
480 for (loop = 0; loop < 6; loop++)
481 r->node[loop] = ntohl(b[loop + 5]);
496 call->state = AFS_CALL_REPLYING;
498 INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
499 queue_work(afs_wq, &call->work);
504 * allow the fileserver to ask about the cache manager's capabilities
506 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
508 struct afs_interface *ifs;
509 struct afs_call *call = container_of(work, struct afs_call, work);
513 struct /* InterfaceAddr */ {
520 struct /* Capabilities */ {
529 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
531 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
539 memset(&reply, 0, sizeof(reply));
540 reply.ia.nifs = htonl(nifs);
542 reply.ia.uuid[0] = htonl(afs_uuid.time_low);
543 reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
544 reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
545 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
546 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
547 for (loop = 0; loop < 6; loop++)
548 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
551 for (loop = 0; loop < nifs; loop++) {
552 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
553 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
554 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
559 reply.cap.capcount = htonl(1);
560 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
561 afs_send_simple_reply(call, &reply, sizeof(reply));
567 * deliver request data to a CB.TellMeAboutYourself call
569 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
570 struct sk_buff *skb, bool last)
572 _enter(",{%u},%d", skb->len, last);
579 /* no unmarshalling required */
580 call->state = AFS_CALL_REPLYING;
582 INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
583 queue_work(afs_wq, &call->work);