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;
119 call->type = &afs_SRXCBProbeUuid;
121 case CBTellMeAboutYourself:
122 call->type = &afs_SRXCBTellMeAboutYourself;
130 * clean up a cache manager call
132 static void afs_cm_destructor(struct afs_call *call)
136 /* Break the callbacks here so that we do it after the final ACK is
137 * received. The step number here must match the final number in
138 * afs_deliver_cb_callback().
140 if (call->unmarshall == 6) {
141 ASSERT(call->server && call->count && call->request);
142 afs_break_callbacks(call->server, call->count, call->request);
145 afs_put_server(call->server);
152 * allow the fileserver to see if the cache manager is still alive
154 static void SRXAFSCB_CallBack(struct work_struct *work)
156 struct afs_call *call = container_of(work, struct afs_call, work);
160 /* be sure to send the reply *before* attempting to spam the AFS server
161 * with FSFetchStatus requests on the vnodes with broken callbacks lest
162 * the AFS server get into a vicious cycle of trying to break further
163 * callbacks because it hadn't received completion of the CBCallBack op
165 afs_send_empty_reply(call);
167 afs_break_callbacks(call->server, call->count, call->request);
172 * deliver request data to a CB.CallBack call
174 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
177 struct afs_callback *cb;
178 struct afs_server *server;
184 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
186 switch (call->unmarshall) {
191 /* extract the FID array and its count in two steps */
193 _debug("extract FID count");
194 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
197 case -EAGAIN: return 0;
201 call->count = ntohl(call->tmp);
202 _debug("FID count: %u", call->count);
203 if (call->count > AFSCBMAX)
206 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
213 _debug("extract FID array");
214 ret = afs_extract_data(call, skb, last, call->buffer,
215 call->count * 3 * 4);
218 case -EAGAIN: return 0;
222 _debug("unmarshall FID array");
223 call->request = kcalloc(call->count,
224 sizeof(struct afs_callback),
231 for (loop = call->count; loop > 0; loop--, cb++) {
232 cb->fid.vid = ntohl(*bp++);
233 cb->fid.vnode = ntohl(*bp++);
234 cb->fid.unique = ntohl(*bp++);
235 cb->type = AFSCM_CB_UNTYPED;
241 /* extract the callback array and its count in two steps */
243 _debug("extract CB count");
244 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
247 case -EAGAIN: return 0;
251 tmp = ntohl(call->tmp);
252 _debug("CB count: %u", tmp);
253 if (tmp != call->count && tmp != 0)
261 _debug("extract CB array");
262 ret = afs_extract_data(call, skb, last, call->request,
263 call->count * 3 * 4);
266 case -EAGAIN: return 0;
270 _debug("unmarshall CB array");
273 for (loop = call->count; loop > 0; loop--, cb++) {
274 cb->version = ntohl(*bp++);
275 cb->expiry = ntohl(*bp++);
276 cb->type = ntohl(*bp++);
288 /* Record that the message was unmarshalled successfully so
289 * that the call destructor can know do the callback breaking
290 * work, even if the final ACK isn't received.
292 * If the step number changes, then afs_cm_destructor() must be
303 call->state = AFS_CALL_REPLYING;
305 /* we'll need the file server record as that tells us which set of
306 * vnodes to operate upon */
307 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
308 server = afs_find_server(&addr);
311 call->server = server;
313 INIT_WORK(&call->work, SRXAFSCB_CallBack);
314 queue_work(afs_wq, &call->work);
319 * allow the fileserver to request callback state (re-)initialisation
321 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
323 struct afs_call *call = container_of(work, struct afs_call, work);
325 _enter("{%p}", call->server);
327 afs_init_callback_state(call->server);
328 afs_send_empty_reply(call);
333 * deliver request data to a CB.InitCallBackState call
335 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
339 struct afs_server *server;
342 _enter(",{%u},%d", skb->len, last);
349 /* no unmarshalling required */
350 call->state = AFS_CALL_REPLYING;
352 /* we'll need the file server record as that tells us which set of
353 * vnodes to operate upon */
354 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
355 server = afs_find_server(&addr);
358 call->server = server;
360 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
361 queue_work(afs_wq, &call->work);
366 * deliver request data to a CB.InitCallBackState3 call
368 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
372 struct afs_server *server;
375 _enter(",{%u},%d", skb->len, last);
380 /* no unmarshalling required */
381 call->state = AFS_CALL_REPLYING;
383 /* we'll need the file server record as that tells us which set of
384 * vnodes to operate upon */
385 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
386 server = afs_find_server(&addr);
389 call->server = server;
391 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
392 queue_work(afs_wq, &call->work);
397 * allow the fileserver to see if the cache manager is still alive
399 static void SRXAFSCB_Probe(struct work_struct *work)
401 struct afs_call *call = container_of(work, struct afs_call, work);
404 afs_send_empty_reply(call);
409 * deliver request data to a CB.Probe call
411 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
414 _enter(",{%u},%d", skb->len, last);
421 /* no unmarshalling required */
422 call->state = AFS_CALL_REPLYING;
424 INIT_WORK(&call->work, SRXAFSCB_Probe);
425 queue_work(afs_wq, &call->work);
430 * allow the fileserver to quickly find out if the fileserver has been rebooted
432 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
434 struct afs_call *call = container_of(work, struct afs_call, work);
435 struct afs_uuid *r = call->request;
444 if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
445 reply.match = htonl(0);
447 reply.match = htonl(1);
449 afs_send_simple_reply(call, &reply, sizeof(reply));
454 * deliver request data to a CB.ProbeUuid call
456 static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
464 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
471 switch (call->unmarshall) {
474 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
480 _debug("extract UUID");
481 ret = afs_extract_data(call, skb, last, call->buffer,
482 11 * sizeof(__be32));
485 case -EAGAIN: return 0;
489 _debug("unmarshall UUID");
490 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
496 r->time_low = ntohl(b[0]);
497 r->time_mid = ntohl(b[1]);
498 r->time_hi_and_version = ntohl(b[2]);
499 r->clock_seq_hi_and_reserved = ntohl(b[3]);
500 r->clock_seq_low = ntohl(b[4]);
502 for (loop = 0; loop < 6; loop++)
503 r->node[loop] = ntohl(b[loop + 5]);
518 call->state = AFS_CALL_REPLYING;
520 INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
521 queue_work(afs_wq, &call->work);
526 * allow the fileserver to ask about the cache manager's capabilities
528 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
530 struct afs_interface *ifs;
531 struct afs_call *call = container_of(work, struct afs_call, work);
535 struct /* InterfaceAddr */ {
542 struct /* Capabilities */ {
551 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
553 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
561 memset(&reply, 0, sizeof(reply));
562 reply.ia.nifs = htonl(nifs);
564 reply.ia.uuid[0] = htonl(afs_uuid.time_low);
565 reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
566 reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
567 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
568 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
569 for (loop = 0; loop < 6; loop++)
570 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
573 for (loop = 0; loop < nifs; loop++) {
574 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
575 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
576 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
581 reply.cap.capcount = htonl(1);
582 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
583 afs_send_simple_reply(call, &reply, sizeof(reply));
589 * deliver request data to a CB.TellMeAboutYourself call
591 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
592 struct sk_buff *skb, bool last)
594 _enter(",{%u},%d", skb->len, last);
601 /* no unmarshalling required */
602 call->state = AFS_CALL_REPLYING;
604 INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
605 queue_work(afs_wq, &call->work);