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>
19 #include "protocol_yfs.h"
21 static int afs_deliver_cb_init_call_back_state(struct afs_call *);
22 static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
23 static int afs_deliver_cb_probe(struct afs_call *);
24 static int afs_deliver_cb_callback(struct afs_call *);
25 static int afs_deliver_cb_probe_uuid(struct afs_call *);
26 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
27 static void afs_cm_destructor(struct afs_call *);
28 static void SRXAFSCB_CallBack(struct work_struct *);
29 static void SRXAFSCB_InitCallBackState(struct work_struct *);
30 static void SRXAFSCB_Probe(struct work_struct *);
31 static void SRXAFSCB_ProbeUuid(struct work_struct *);
32 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
34 static int afs_deliver_yfs_cb_callback(struct afs_call *);
36 #define CM_NAME(name) \
37 char afs_SRXCB##name##_name[] __tracepoint_string = \
41 * CB.CallBack operation type
43 static CM_NAME(CallBack);
44 static const struct afs_call_type afs_SRXCBCallBack = {
45 .name = afs_SRXCBCallBack_name,
46 .deliver = afs_deliver_cb_callback,
47 .destructor = afs_cm_destructor,
48 .work = SRXAFSCB_CallBack,
52 * CB.InitCallBackState operation type
54 static CM_NAME(InitCallBackState);
55 static const struct afs_call_type afs_SRXCBInitCallBackState = {
56 .name = afs_SRXCBInitCallBackState_name,
57 .deliver = afs_deliver_cb_init_call_back_state,
58 .destructor = afs_cm_destructor,
59 .work = SRXAFSCB_InitCallBackState,
63 * CB.InitCallBackState3 operation type
65 static CM_NAME(InitCallBackState3);
66 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
67 .name = afs_SRXCBInitCallBackState3_name,
68 .deliver = afs_deliver_cb_init_call_back_state3,
69 .destructor = afs_cm_destructor,
70 .work = SRXAFSCB_InitCallBackState,
74 * CB.Probe operation type
76 static CM_NAME(Probe);
77 static const struct afs_call_type afs_SRXCBProbe = {
78 .name = afs_SRXCBProbe_name,
79 .deliver = afs_deliver_cb_probe,
80 .destructor = afs_cm_destructor,
81 .work = SRXAFSCB_Probe,
85 * CB.ProbeUuid operation type
87 static CM_NAME(ProbeUuid);
88 static const struct afs_call_type afs_SRXCBProbeUuid = {
89 .name = afs_SRXCBProbeUuid_name,
90 .deliver = afs_deliver_cb_probe_uuid,
91 .destructor = afs_cm_destructor,
92 .work = SRXAFSCB_ProbeUuid,
96 * CB.TellMeAboutYourself operation type
98 static CM_NAME(TellMeAboutYourself);
99 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
100 .name = afs_SRXCBTellMeAboutYourself_name,
101 .deliver = afs_deliver_cb_tell_me_about_yourself,
102 .destructor = afs_cm_destructor,
103 .work = SRXAFSCB_TellMeAboutYourself,
107 * YFS CB.CallBack operation type
109 static CM_NAME(YFS_CallBack);
110 static const struct afs_call_type afs_SRXYFSCB_CallBack = {
111 .name = afs_SRXCBYFS_CallBack_name,
112 .deliver = afs_deliver_yfs_cb_callback,
113 .destructor = afs_cm_destructor,
114 .work = SRXAFSCB_CallBack,
118 * route an incoming cache manager call
119 * - return T if supported, F if not
121 bool afs_cm_incoming_call(struct afs_call *call)
123 _enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
125 call->epoch = rxrpc_kernel_get_epoch(call->net->socket, call->rxcall);
127 switch (call->operation_ID) {
129 call->type = &afs_SRXCBCallBack;
131 case CBInitCallBackState:
132 call->type = &afs_SRXCBInitCallBackState;
134 case CBInitCallBackState3:
135 call->type = &afs_SRXCBInitCallBackState3;
138 call->type = &afs_SRXCBProbe;
141 call->type = &afs_SRXCBProbeUuid;
143 case CBTellMeAboutYourself:
144 call->type = &afs_SRXCBTellMeAboutYourself;
147 if (call->service_id != YFS_CM_SERVICE)
149 call->type = &afs_SRXYFSCB_CallBack;
157 * Record a probe to the cache manager from a server.
159 static int afs_record_cm_probe(struct afs_call *call, struct afs_server *server)
163 if (test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags) &&
164 !test_bit(AFS_SERVER_FL_PROBING, &server->flags)) {
165 if (server->cm_epoch == call->epoch)
168 if (!server->probe.said_rebooted) {
169 pr_notice("kAFS: FS rebooted %pU\n", &server->uuid);
170 server->probe.said_rebooted = true;
174 spin_lock(&server->probe_lock);
176 if (!test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags)) {
177 server->cm_epoch = call->epoch;
178 server->probe.cm_epoch = call->epoch;
182 if (server->probe.cm_probed &&
183 call->epoch != server->probe.cm_epoch &&
184 !server->probe.said_inconsistent) {
185 pr_notice("kAFS: FS endpoints inconsistent %pU\n",
187 server->probe.said_inconsistent = true;
190 if (!server->probe.cm_probed || call->epoch == server->cm_epoch)
191 server->probe.cm_epoch = server->cm_epoch;
194 server->probe.cm_probed = true;
195 spin_unlock(&server->probe_lock);
200 * Find the server record by peer address and record a probe to the cache
201 * manager from a server.
203 static int afs_find_cm_server_by_peer(struct afs_call *call)
205 struct sockaddr_rxrpc srx;
206 struct afs_server *server;
208 rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
210 server = afs_find_server(call->net, &srx);
212 trace_afs_cm_no_server(call, &srx);
216 call->server = server;
217 return afs_record_cm_probe(call, server);
221 * Find the server record by server UUID and record a probe to the cache
222 * manager from a server.
224 static int afs_find_cm_server_by_uuid(struct afs_call *call,
225 struct afs_uuid *uuid)
227 struct afs_server *server;
230 server = afs_find_server_by_uuid(call->net, call->request);
233 trace_afs_cm_no_server_u(call, call->request);
237 call->server = server;
238 return afs_record_cm_probe(call, server);
242 * Clean up a cache manager call.
244 static void afs_cm_destructor(struct afs_call *call)
251 * The server supplied a list of callbacks that it wanted to break.
253 static void SRXAFSCB_CallBack(struct work_struct *work)
255 struct afs_call *call = container_of(work, struct afs_call, work);
259 /* We need to break the callbacks before sending the reply as the
260 * server holds up change visibility till it receives our reply so as
261 * to maintain cache coherency.
264 afs_break_callbacks(call->server, call->count, call->request);
266 afs_send_empty_reply(call);
272 * deliver request data to a CB.CallBack call
274 static int afs_deliver_cb_callback(struct afs_call *call)
276 struct afs_callback_break *cb;
280 _enter("{%u}", call->unmarshall);
282 switch (call->unmarshall) {
284 afs_extract_to_tmp(call);
287 /* extract the FID array and its count in two steps */
290 _debug("extract FID count");
291 ret = afs_extract_data(call, true);
295 call->count = ntohl(call->tmp);
296 _debug("FID count: %u", call->count);
297 if (call->count > AFSCBMAX)
298 return afs_protocol_error(call, -EBADMSG,
299 afs_eproto_cb_fid_count);
301 call->buffer = kmalloc(array3_size(call->count, 3, 4),
305 afs_extract_to_buf(call, call->count * 3 * 4);
310 _debug("extract FID array");
311 ret = afs_extract_data(call, true);
315 _debug("unmarshall FID array");
316 call->request = kcalloc(call->count,
317 sizeof(struct afs_callback_break),
324 for (loop = call->count; loop > 0; loop--, cb++) {
325 cb->fid.vid = ntohl(*bp++);
326 cb->fid.vnode = ntohl(*bp++);
327 cb->fid.unique = ntohl(*bp++);
330 afs_extract_to_tmp(call);
333 /* extract the callback array and its count in two steps */
336 _debug("extract CB count");
337 ret = afs_extract_data(call, true);
341 call->count2 = ntohl(call->tmp);
342 _debug("CB count: %u", call->count2);
343 if (call->count2 != call->count && call->count2 != 0)
344 return afs_protocol_error(call, -EBADMSG,
345 afs_eproto_cb_count);
346 call->_iter = &call->iter;
347 iov_iter_discard(&call->iter, READ, call->count2 * 3 * 4);
352 _debug("extract discard %zu/%u",
353 iov_iter_count(&call->iter), call->count2 * 3 * 4);
355 ret = afs_extract_data(call, false);
364 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
365 return afs_io_error(call, afs_io_error_cm_reply);
367 /* we'll need the file server record as that tells us which set of
368 * vnodes to operate upon */
369 return afs_find_cm_server_by_peer(call);
373 * allow the fileserver to request callback state (re-)initialisation
375 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
377 struct afs_call *call = container_of(work, struct afs_call, work);
379 _enter("{%p}", call->server);
382 afs_init_callback_state(call->server);
383 afs_send_empty_reply(call);
389 * deliver request data to a CB.InitCallBackState call
391 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
397 afs_extract_discard(call, 0);
398 ret = afs_extract_data(call, false);
402 /* we'll need the file server record as that tells us which set of
403 * vnodes to operate upon */
404 return afs_find_cm_server_by_peer(call);
408 * deliver request data to a CB.InitCallBackState3 call
410 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
419 _enter("{%u}", call->unmarshall);
421 switch (call->unmarshall) {
423 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
426 afs_extract_to_buf(call, 11 * sizeof(__be32));
431 _debug("extract UUID");
432 ret = afs_extract_data(call, false);
435 case -EAGAIN: return 0;
439 _debug("unmarshall UUID");
440 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
447 r->time_mid = htons(ntohl(b[1]));
448 r->time_hi_and_version = htons(ntohl(b[2]));
449 r->clock_seq_hi_and_reserved = ntohl(b[3]);
450 r->clock_seq_low = ntohl(b[4]);
452 for (loop = 0; loop < 6; loop++)
453 r->node[loop] = ntohl(b[loop + 5]);
461 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
462 return afs_io_error(call, afs_io_error_cm_reply);
464 /* we'll need the file server record as that tells us which set of
465 * vnodes to operate upon */
466 return afs_find_cm_server_by_uuid(call, call->request);
470 * allow the fileserver to see if the cache manager is still alive
472 static void SRXAFSCB_Probe(struct work_struct *work)
474 struct afs_call *call = container_of(work, struct afs_call, work);
477 afs_send_empty_reply(call);
483 * deliver request data to a CB.Probe call
485 static int afs_deliver_cb_probe(struct afs_call *call)
491 afs_extract_discard(call, 0);
492 ret = afs_extract_data(call, false);
496 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
497 return afs_io_error(call, afs_io_error_cm_reply);
498 return afs_find_cm_server_by_peer(call);
502 * allow the fileserver to quickly find out if the fileserver has been rebooted
504 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
506 struct afs_call *call = container_of(work, struct afs_call, work);
507 struct afs_uuid *r = call->request;
515 if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
516 reply.match = htonl(0);
518 reply.match = htonl(1);
520 afs_send_simple_reply(call, &reply, sizeof(reply));
526 * deliver request data to a CB.ProbeUuid call
528 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
535 _enter("{%u}", call->unmarshall);
537 switch (call->unmarshall) {
539 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
542 afs_extract_to_buf(call, 11 * sizeof(__be32));
547 _debug("extract UUID");
548 ret = afs_extract_data(call, false);
551 case -EAGAIN: return 0;
555 _debug("unmarshall UUID");
556 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
563 r->time_mid = htons(ntohl(b[1]));
564 r->time_hi_and_version = htons(ntohl(b[2]));
565 r->clock_seq_hi_and_reserved = ntohl(b[3]);
566 r->clock_seq_low = ntohl(b[4]);
568 for (loop = 0; loop < 6; loop++)
569 r->node[loop] = ntohl(b[loop + 5]);
577 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
578 return afs_io_error(call, afs_io_error_cm_reply);
579 return afs_find_cm_server_by_uuid(call, call->request);
583 * allow the fileserver to ask about the cache manager's capabilities
585 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
587 struct afs_interface *ifs;
588 struct afs_call *call = container_of(work, struct afs_call, work);
592 struct /* InterfaceAddr */ {
599 struct /* Capabilities */ {
608 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
610 nifs = afs_get_ipv4_interfaces(call->net, ifs, 32, false);
618 memset(&reply, 0, sizeof(reply));
619 reply.ia.nifs = htonl(nifs);
621 reply.ia.uuid[0] = call->net->uuid.time_low;
622 reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
623 reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
624 reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
625 reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
626 for (loop = 0; loop < 6; loop++)
627 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
630 for (loop = 0; loop < nifs; loop++) {
631 reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
632 reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
633 reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
638 reply.cap.capcount = htonl(1);
639 reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
640 afs_send_simple_reply(call, &reply, sizeof(reply));
646 * deliver request data to a CB.TellMeAboutYourself call
648 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
654 afs_extract_discard(call, 0);
655 ret = afs_extract_data(call, false);
659 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
660 return afs_io_error(call, afs_io_error_cm_reply);
661 return afs_find_cm_server_by_peer(call);
665 * deliver request data to a YFS CB.CallBack call
667 static int afs_deliver_yfs_cb_callback(struct afs_call *call)
669 struct afs_callback_break *cb;
670 struct yfs_xdr_YFSFid *bp;
674 _enter("{%u}", call->unmarshall);
676 switch (call->unmarshall) {
678 afs_extract_to_tmp(call);
681 /* extract the FID array and its count in two steps */
684 _debug("extract FID count");
685 ret = afs_extract_data(call, true);
689 call->count = ntohl(call->tmp);
690 _debug("FID count: %u", call->count);
691 if (call->count > YFSCBMAX)
692 return afs_protocol_error(call, -EBADMSG,
693 afs_eproto_cb_fid_count);
695 size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
696 call->buffer = kmalloc(size, GFP_KERNEL);
699 afs_extract_to_buf(call, size);
704 _debug("extract FID array");
705 ret = afs_extract_data(call, false);
709 _debug("unmarshall FID array");
710 call->request = kcalloc(call->count,
711 sizeof(struct afs_callback_break),
718 for (loop = call->count; loop > 0; loop--, cb++) {
719 cb->fid.vid = xdr_to_u64(bp->volume);
720 cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
721 cb->fid.vnode_hi = ntohl(bp->vnode.hi);
722 cb->fid.unique = ntohl(bp->vnode.unique);
726 afs_extract_to_tmp(call);
733 if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
734 return afs_io_error(call, afs_io_error_cm_reply);
736 /* We'll need the file server record as that tells us which set of
737 * vnodes to operate upon.
739 return afs_find_cm_server_by_peer(call);