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 /* Break the callbacks here so that we do it after the final ACK is
134 * received. The step number here must match the final number in
135 * afs_deliver_cb_callback().
137 if (call->unmarshall == 6) {
138 ASSERT(call->server && call->count && call->request);
139 afs_break_callbacks(call->server, call->count, call->request);
142 afs_put_server(call->server);
149 * allow the fileserver to see if the cache manager is still alive
151 static void SRXAFSCB_CallBack(struct work_struct *work)
153 struct afs_call *call = container_of(work, struct afs_call, work);
157 /* be sure to send the reply *before* attempting to spam the AFS server
158 * with FSFetchStatus requests on the vnodes with broken callbacks lest
159 * the AFS server get into a vicious cycle of trying to break further
160 * callbacks because it hadn't received completion of the CBCallBack op
162 afs_send_empty_reply(call);
164 afs_break_callbacks(call->server, call->count, call->request);
169 * deliver request data to a CB.CallBack call
171 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
174 struct afs_callback *cb;
175 struct afs_server *server;
181 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
183 switch (call->unmarshall) {
188 /* extract the FID array and its count in two steps */
190 _debug("extract FID count");
191 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
194 case -EAGAIN: return 0;
198 call->count = ntohl(call->tmp);
199 _debug("FID count: %u", call->count);
200 if (call->count > AFSCBMAX)
203 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
210 _debug("extract FID array");
211 ret = afs_extract_data(call, skb, last, call->buffer,
212 call->count * 3 * 4);
215 case -EAGAIN: return 0;
219 _debug("unmarshall FID array");
220 call->request = kcalloc(call->count,
221 sizeof(struct afs_callback),
228 for (loop = call->count; loop > 0; loop--, cb++) {
229 cb->fid.vid = ntohl(*bp++);
230 cb->fid.vnode = ntohl(*bp++);
231 cb->fid.unique = ntohl(*bp++);
232 cb->type = AFSCM_CB_UNTYPED;
238 /* extract the callback array and its count in two steps */
240 _debug("extract CB count");
241 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
244 case -EAGAIN: return 0;
248 tmp = ntohl(call->tmp);
249 _debug("CB count: %u", tmp);
250 if (tmp != call->count && tmp != 0)
258 _debug("extract CB array");
259 ret = afs_extract_data(call, skb, last, call->request,
260 call->count * 3 * 4);
263 case -EAGAIN: return 0;
267 _debug("unmarshall CB array");
270 for (loop = call->count; loop > 0; loop--, cb++) {
271 cb->version = ntohl(*bp++);
272 cb->expiry = ntohl(*bp++);
273 cb->type = ntohl(*bp++);
285 /* Record that the message was unmarshalled successfully so
286 * that the call destructor can know do the callback breaking
287 * work, even if the final ACK isn't received.
289 * If the step number changes, then afs_cm_destructor() must be
300 call->state = AFS_CALL_REPLYING;
302 /* we'll need the file server record as that tells us which set of
303 * vnodes to operate upon */
304 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
305 server = afs_find_server(&addr);
308 call->server = server;
310 INIT_WORK(&call->work, SRXAFSCB_CallBack);
311 queue_work(afs_wq, &call->work);
316 * allow the fileserver to request callback state (re-)initialisation
318 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
320 struct afs_call *call = container_of(work, struct afs_call, work);
322 _enter("{%p}", call->server);
324 afs_init_callback_state(call->server);
325 afs_send_empty_reply(call);
330 * deliver request data to a CB.InitCallBackState call
332 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
336 struct afs_server *server;
339 _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 queue_work(afs_wq, &call->work);
363 * deliver request data to a CB.InitCallBackState3 call
365 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
369 struct afs_server *server;
372 _enter(",{%u},%d", skb->len, last);
377 /* no unmarshalling required */
378 call->state = AFS_CALL_REPLYING;
380 /* we'll need the file server record as that tells us which set of
381 * vnodes to operate upon */
382 memcpy(&addr, &ip_hdr(skb)->saddr, 4);
383 server = afs_find_server(&addr);
386 call->server = server;
388 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
389 queue_work(afs_wq, &call->work);
394 * allow the fileserver to see if the cache manager is still alive
396 static void SRXAFSCB_Probe(struct work_struct *work)
398 struct afs_call *call = container_of(work, struct afs_call, work);
401 afs_send_empty_reply(call);
406 * deliver request data to a CB.Probe call
408 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
411 _enter(",{%u},%d", skb->len, last);
418 /* no unmarshalling required */
419 call->state = AFS_CALL_REPLYING;
421 INIT_WORK(&call->work, SRXAFSCB_Probe);
422 queue_work(afs_wq, &call->work);
427 * allow the fileserver to quickly find out if the fileserver has been rebooted
429 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
431 struct afs_call *call = container_of(work, struct afs_call, work);
432 struct afs_uuid *r = call->request;
441 if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
442 reply.match = htonl(0);
444 reply.match = htonl(1);
446 afs_send_simple_reply(call, &reply, sizeof(reply));
451 * deliver request data to a CB.ProbeUuid call
453 static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
461 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
468 switch (call->unmarshall) {
471 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
477 _debug("extract UUID");
478 ret = afs_extract_data(call, skb, last, call->buffer,
479 11 * sizeof(__be32));
482 case -EAGAIN: return 0;
486 _debug("unmarshall UUID");
487 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
493 r->time_low = ntohl(b[0]);
494 r->time_mid = ntohl(b[1]);
495 r->time_hi_and_version = ntohl(b[2]);
496 r->clock_seq_hi_and_reserved = ntohl(b[3]);
497 r->clock_seq_low = ntohl(b[4]);
499 for (loop = 0; loop < 6; loop++)
500 r->node[loop] = ntohl(b[loop + 5]);
515 call->state = AFS_CALL_REPLYING;
517 INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
518 queue_work(afs_wq, &call->work);
523 * allow the fileserver to ask about the cache manager's capabilities
525 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
527 struct afs_interface *ifs;
528 struct afs_call *call = container_of(work, struct afs_call, work);
532 struct /* InterfaceAddr */ {
539 struct /* Capabilities */ {
548 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
550 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
558 memset(&reply, 0, sizeof(reply));
559 reply.ia.nifs = htonl(nifs);
561 reply.ia.uuid[0] = htonl(afs_uuid.time_low);
562 reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
563 reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
564 reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
565 reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
566 for (loop = 0; loop < 6; loop++)
567 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
570 for (loop = 0; loop < nifs; loop++) {
571 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
572 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
573 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
578 reply.cap.capcount = htonl(1);
579 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
580 afs_send_simple_reply(call, &reply, sizeof(reply));
586 * deliver request data to a CB.TellMeAboutYourself call
588 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
589 struct sk_buff *skb, bool last)
591 _enter(",{%u},%d", skb->len, last);
598 /* no unmarshalling required */
599 call->state = AFS_CALL_REPLYING;
601 INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
602 queue_work(afs_wq, &call->work);