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>
19 struct workqueue_struct *afs_cm_workqueue;
21 static int afs_deliver_cb_init_call_back_state(struct afs_call *,
22 struct sk_buff *, bool);
23 static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
24 struct sk_buff *, bool);
25 static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
26 static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
27 static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *,
29 static void afs_cm_destructor(struct afs_call *);
32 * CB.CallBack operation type
34 static const struct afs_call_type afs_SRXCBCallBack = {
35 .name = "CB.CallBack",
36 .deliver = afs_deliver_cb_callback,
37 .abort_to_error = afs_abort_to_error,
38 .destructor = afs_cm_destructor,
42 * CB.InitCallBackState operation type
44 static const struct afs_call_type afs_SRXCBInitCallBackState = {
45 .name = "CB.InitCallBackState",
46 .deliver = afs_deliver_cb_init_call_back_state,
47 .abort_to_error = afs_abort_to_error,
48 .destructor = afs_cm_destructor,
52 * CB.InitCallBackState3 operation type
54 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
55 .name = "CB.InitCallBackState3",
56 .deliver = afs_deliver_cb_init_call_back_state3,
57 .abort_to_error = afs_abort_to_error,
58 .destructor = afs_cm_destructor,
62 * CB.Probe operation type
64 static const struct afs_call_type afs_SRXCBProbe = {
66 .deliver = afs_deliver_cb_probe,
67 .abort_to_error = afs_abort_to_error,
68 .destructor = afs_cm_destructor,
72 * CB.GetCapabilities operation type
74 static const struct afs_call_type afs_SRXCBGetCapabilites = {
75 .name = "CB.GetCapabilities",
76 .deliver = afs_deliver_cb_get_capabilities,
77 .abort_to_error = afs_abort_to_error,
78 .destructor = afs_cm_destructor,
82 * route an incoming cache manager call
83 * - return T if supported, F if not
85 bool afs_cm_incoming_call(struct afs_call *call)
87 u32 operation_id = ntohl(call->operation_ID);
89 _enter("{CB.OP %u}", operation_id);
91 switch (operation_id) {
93 call->type = &afs_SRXCBCallBack;
95 case CBInitCallBackState:
96 call->type = &afs_SRXCBInitCallBackState;
98 case CBInitCallBackState3:
99 call->type = &afs_SRXCBInitCallBackState3;
102 call->type = &afs_SRXCBProbe;
104 case CBGetCapabilities:
105 call->type = &afs_SRXCBGetCapabilites;
113 * clean up a cache manager call
115 static void afs_cm_destructor(struct afs_call *call)
119 afs_put_server(call->server);
126 * allow the fileserver to see if the cache manager is still alive
128 static void SRXAFSCB_CallBack(struct work_struct *work)
130 struct afs_call *call = container_of(work, struct afs_call, work);
134 /* be sure to send the reply *before* attempting to spam the AFS server
135 * with FSFetchStatus requests on the vnodes with broken callbacks lest
136 * the AFS server get into a vicious cycle of trying to break further
137 * callbacks because it hadn't received completion of the CBCallBack op
139 afs_send_empty_reply(call);
141 afs_break_callbacks(call->server, call->count, call->request);
146 * deliver request data to a CB.CallBack call
148 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
151 struct afs_callback *cb;
152 struct afs_server *server;
158 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
160 switch (call->unmarshall) {
165 /* extract the FID array and its count in two steps */
167 _debug("extract FID count");
168 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
171 case -EAGAIN: return 0;
175 call->count = ntohl(call->tmp);
176 _debug("FID count: %u", call->count);
177 if (call->count > AFSCBMAX)
180 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
187 _debug("extract FID array");
188 ret = afs_extract_data(call, skb, last, call->buffer,
189 call->count * 3 * 4);
192 case -EAGAIN: return 0;
196 _debug("unmarshall FID array");
197 call->request = kcalloc(call->count,
198 sizeof(struct afs_callback),
205 for (loop = call->count; loop > 0; loop--, cb++) {
206 cb->fid.vid = ntohl(*bp++);
207 cb->fid.vnode = ntohl(*bp++);
208 cb->fid.unique = ntohl(*bp++);
209 cb->type = AFSCM_CB_UNTYPED;
215 /* extract the callback array and its count in two steps */
217 _debug("extract CB count");
218 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
221 case -EAGAIN: return 0;
225 tmp = ntohl(call->tmp);
226 _debug("CB count: %u", tmp);
227 if (tmp != call->count && tmp != 0)
235 _debug("extract CB array");
236 ret = afs_extract_data(call, skb, last, call->request,
237 call->count * 3 * 4);
240 case -EAGAIN: return 0;
244 _debug("unmarshall CB array");
247 for (loop = call->count; loop > 0; loop--, cb++) {
248 cb->version = ntohl(*bp++);
249 cb->expiry = ntohl(*bp++);
250 cb->type = ntohl(*bp++);
267 call->state = AFS_CALL_REPLYING;
269 /* we'll need the file server record as that tells us which set of
270 * vnodes to operate upon */
271 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
272 server = afs_find_server(&addr);
275 call->server = server;
277 INIT_WORK(&call->work, SRXAFSCB_CallBack);
278 schedule_work(&call->work);
283 * allow the fileserver to request callback state (re-)initialisation
285 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
287 struct afs_call *call = container_of(work, struct afs_call, work);
289 _enter("{%p}", call->server);
291 afs_init_callback_state(call->server);
292 afs_send_empty_reply(call);
297 * deliver request data to a CB.InitCallBackState call
299 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
303 struct afs_server *server;
306 _enter(",{%u},%d", skb->len, last);
313 /* no unmarshalling required */
314 call->state = AFS_CALL_REPLYING;
316 /* we'll need the file server record as that tells us which set of
317 * vnodes to operate upon */
318 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
319 server = afs_find_server(&addr);
322 call->server = server;
324 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
325 schedule_work(&call->work);
330 * deliver request data to a CB.InitCallBackState3 call
332 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
336 struct afs_server *server;
339 _enter(",{%u},%d", skb->len, last);
344 /* no unmarshalling required */
345 call->state = AFS_CALL_REPLYING;
347 /* we'll need the file server record as that tells us which set of
348 * vnodes to operate upon */
349 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
350 server = afs_find_server(&addr);
353 call->server = server;
355 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
356 schedule_work(&call->work);
361 * allow the fileserver to see if the cache manager is still alive
363 static void SRXAFSCB_Probe(struct work_struct *work)
365 struct afs_call *call = container_of(work, struct afs_call, work);
368 afs_send_empty_reply(call);
373 * deliver request data to a CB.Probe call
375 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
378 _enter(",{%u},%d", skb->len, last);
385 /* no unmarshalling required */
386 call->state = AFS_CALL_REPLYING;
388 INIT_WORK(&call->work, SRXAFSCB_Probe);
389 schedule_work(&call->work);
394 * allow the fileserver to ask about the cache manager's capabilities
396 static void SRXAFSCB_GetCapabilities(struct work_struct *work)
398 struct afs_interface *ifs;
399 struct afs_call *call = container_of(work, struct afs_call, work);
403 struct /* InterfaceAddr */ {
410 struct /* Capabilities */ {
419 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
421 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
429 memset(&reply, 0, sizeof(reply));
430 reply.ia.nifs = htonl(nifs);
432 reply.ia.uuid[0] = htonl(afs_uuid.time_low);
433 reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
434 reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
435 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
436 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
437 for (loop = 0; loop < 6; loop++)
438 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
441 for (loop = 0; loop < nifs; loop++) {
442 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
443 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
444 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
449 reply.cap.capcount = htonl(1);
450 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
451 afs_send_simple_reply(call, &reply, sizeof(reply));
457 * deliver request data to a CB.GetCapabilities call
459 static int afs_deliver_cb_get_capabilities(struct afs_call *call,
460 struct sk_buff *skb, bool last)
462 _enter(",{%u},%d", skb->len, last);
469 /* no unmarshalling required */
470 call->state = AFS_CALL_REPLYING;
472 INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
473 schedule_work(&call->work);