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/sched.h>
20 struct workqueue_struct *afs_cm_workqueue;
23 static int afs_deliver_cb_init_call_back_state(struct afs_call *,
24 struct sk_buff *, bool);
25 static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
26 struct sk_buff *, bool);
27 static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
28 static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
29 static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *,
31 static void afs_cm_destructor(struct afs_call *);
34 * CB.CallBack operation type
36 static const struct afs_call_type afs_SRXCBCallBack = {
37 .name = "CB.CallBack",
38 .deliver = afs_deliver_cb_callback,
39 .abort_to_error = afs_abort_to_error,
40 .destructor = afs_cm_destructor,
44 * CB.InitCallBackState operation type
46 static const struct afs_call_type afs_SRXCBInitCallBackState = {
47 .name = "CB.InitCallBackState",
48 .deliver = afs_deliver_cb_init_call_back_state,
49 .abort_to_error = afs_abort_to_error,
50 .destructor = afs_cm_destructor,
54 * CB.InitCallBackState3 operation type
56 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
57 .name = "CB.InitCallBackState3",
58 .deliver = afs_deliver_cb_init_call_back_state3,
59 .abort_to_error = afs_abort_to_error,
60 .destructor = afs_cm_destructor,
64 * CB.Probe operation type
66 static const struct afs_call_type afs_SRXCBProbe = {
68 .deliver = afs_deliver_cb_probe,
69 .abort_to_error = afs_abort_to_error,
70 .destructor = afs_cm_destructor,
74 * CB.GetCapabilities operation type
76 static const struct afs_call_type afs_SRXCBGetCapabilites = {
77 .name = "CB.GetCapabilities",
78 .deliver = afs_deliver_cb_get_capabilities,
79 .abort_to_error = afs_abort_to_error,
80 .destructor = afs_cm_destructor,
84 * route an incoming cache manager call
85 * - return T if supported, F if not
87 bool afs_cm_incoming_call(struct afs_call *call)
89 u32 operation_id = ntohl(call->operation_ID);
91 _enter("{CB.OP %u}", operation_id);
93 switch (operation_id) {
95 call->type = &afs_SRXCBCallBack;
97 case CBInitCallBackState:
98 call->type = &afs_SRXCBInitCallBackState;
100 case CBInitCallBackState3:
101 call->type = &afs_SRXCBInitCallBackState3;
104 call->type = &afs_SRXCBProbe;
106 case CBGetCapabilities:
107 call->type = &afs_SRXCBGetCapabilites;
115 * clean up a cache manager call
117 static void afs_cm_destructor(struct afs_call *call)
121 afs_put_server(call->server);
128 * allow the fileserver to see if the cache manager is still alive
130 static void SRXAFSCB_CallBack(struct work_struct *work)
132 struct afs_call *call = container_of(work, struct afs_call, work);
136 /* be sure to send the reply *before* attempting to spam the AFS server
137 * with FSFetchStatus requests on the vnodes with broken callbacks lest
138 * the AFS server get into a vicious cycle of trying to break further
139 * callbacks because it hadn't received completion of the CBCallBack op
141 afs_send_empty_reply(call);
143 afs_break_callbacks(call->server, call->count, call->request);
148 * deliver request data to a CB.CallBack call
150 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
153 struct afs_callback *cb;
154 struct afs_server *server;
160 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
162 switch (call->unmarshall) {
167 /* extract the FID array and its count in two steps */
169 _debug("extract FID count");
170 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
173 case -EAGAIN: return 0;
177 call->count = ntohl(call->tmp);
178 _debug("FID count: %u", call->count);
179 if (call->count > AFSCBMAX)
182 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
189 _debug("extract FID array");
190 ret = afs_extract_data(call, skb, last, call->buffer,
191 call->count * 3 * 4);
194 case -EAGAIN: return 0;
198 _debug("unmarshall FID array");
199 call->request = kcalloc(call->count,
200 sizeof(struct afs_callback),
207 for (loop = call->count; loop > 0; loop--, cb++) {
208 cb->fid.vid = ntohl(*bp++);
209 cb->fid.vnode = ntohl(*bp++);
210 cb->fid.unique = ntohl(*bp++);
211 cb->type = AFSCM_CB_UNTYPED;
217 /* extract the callback array and its count in two steps */
219 _debug("extract CB count");
220 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
223 case -EAGAIN: return 0;
227 tmp = ntohl(call->tmp);
228 _debug("CB count: %u", tmp);
229 if (tmp != call->count && tmp != 0)
237 _debug("extract CB array");
238 ret = afs_extract_data(call, skb, last, call->request,
239 call->count * 3 * 4);
242 case -EAGAIN: return 0;
246 _debug("unmarshall CB array");
249 for (loop = call->count; loop > 0; loop--, cb++) {
250 cb->version = ntohl(*bp++);
251 cb->expiry = ntohl(*bp++);
252 cb->type = ntohl(*bp++);
269 call->state = AFS_CALL_REPLYING;
271 /* we'll need the file server record as that tells us which set of
272 * vnodes to operate upon */
273 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
274 server = afs_find_server(&addr);
277 call->server = server;
279 INIT_WORK(&call->work, SRXAFSCB_CallBack);
280 schedule_work(&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,
305 struct afs_server *server;
308 _enter(",{%u},%d", skb->len, last);
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 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
321 server = afs_find_server(&addr);
324 call->server = server;
326 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
327 schedule_work(&call->work);
332 * deliver request data to a CB.InitCallBackState3 call
334 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
338 struct afs_server *server;
341 _enter(",{%u},%d", skb->len, last);
346 /* no unmarshalling required */
347 call->state = AFS_CALL_REPLYING;
349 /* we'll need the file server record as that tells us which set of
350 * vnodes to operate upon */
351 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
352 server = afs_find_server(&addr);
355 call->server = server;
357 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
358 schedule_work(&call->work);
363 * allow the fileserver to see if the cache manager is still alive
365 static void SRXAFSCB_Probe(struct work_struct *work)
367 struct afs_call *call = container_of(work, struct afs_call, work);
370 afs_send_empty_reply(call);
375 * deliver request data to a CB.Probe call
377 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
380 _enter(",{%u},%d", skb->len, last);
387 /* no unmarshalling required */
388 call->state = AFS_CALL_REPLYING;
390 INIT_WORK(&call->work, SRXAFSCB_Probe);
391 schedule_work(&call->work);
396 * allow the fileserver to ask about the cache manager's capabilities
398 static void SRXAFSCB_GetCapabilities(struct work_struct *work)
400 struct afs_interface *ifs;
401 struct afs_call *call = container_of(work, struct afs_call, work);
405 struct /* InterfaceAddr */ {
412 struct /* Capabilities */ {
421 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
423 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
431 memset(&reply, 0, sizeof(reply));
432 reply.ia.nifs = htonl(nifs);
434 reply.ia.uuid[0] = htonl(afs_uuid.time_low);
435 reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
436 reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
437 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
438 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
439 for (loop = 0; loop < 6; loop++)
440 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
443 for (loop = 0; loop < nifs; loop++) {
444 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
445 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
446 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
451 reply.cap.capcount = htonl(1);
452 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
453 afs_send_simple_reply(call, &reply, sizeof(reply));
459 * deliver request data to a CB.GetCapabilities call
461 static int afs_deliver_cb_get_capabilities(struct afs_call *call,
462 struct sk_buff *skb, bool last)
464 _enter(",{%u},%d", skb->len, last);
471 /* no unmarshalling required */
472 call->state = AFS_CALL_REPLYING;
474 INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
475 schedule_work(&call->work);