blob: d5b2ad6575bc05dfe4a3af63ed0ee4f38f1be094 [file] [log] [blame]
David Howellsec268152007-04-26 15:49:28 -07001/* AFS Cache Manager Service
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
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.
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/sched.h>
David Howells08e0e7c2007-04-26 15:55:03 -070015#include <linux/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include "internal.h"
David Howells08e0e7c2007-04-26 15:55:03 -070017#include "afs_cm.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
David Howells08e0e7c2007-04-26 15:55:03 -070019struct workqueue_struct *afs_cm_workqueue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
David Howells08e0e7c2007-04-26 15:55:03 -070021static int afs_deliver_cb_init_call_back_state(struct afs_call *,
22 struct sk_buff *, bool);
David Howellsc35eccb2007-04-26 15:58:49 -070023static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
24 struct sk_buff *, bool);
David Howells08e0e7c2007-04-26 15:55:03 -070025static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
26static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
David Howellsb908fe62007-04-26 15:58:17 -070027static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *,
28 bool);
David Howells08e0e7c2007-04-26 15:55:03 -070029static void afs_cm_destructor(struct afs_call *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
David Howells08e0e7c2007-04-26 15:55:03 -070031/*
32 * CB.CallBack operation type
33 */
34static const struct afs_call_type afs_SRXCBCallBack = {
David Howells00d3b7a2007-04-26 15:57:07 -070035 .name = "CB.CallBack",
David Howells08e0e7c2007-04-26 15:55:03 -070036 .deliver = afs_deliver_cb_callback,
37 .abort_to_error = afs_abort_to_error,
38 .destructor = afs_cm_destructor,
Linus Torvalds1da177e2005-04-16 15:20:36 -070039};
40
David Howells08e0e7c2007-04-26 15:55:03 -070041/*
42 * CB.InitCallBackState operation type
43 */
44static const struct afs_call_type afs_SRXCBInitCallBackState = {
David Howells00d3b7a2007-04-26 15:57:07 -070045 .name = "CB.InitCallBackState",
David Howells08e0e7c2007-04-26 15:55:03 -070046 .deliver = afs_deliver_cb_init_call_back_state,
47 .abort_to_error = afs_abort_to_error,
48 .destructor = afs_cm_destructor,
Linus Torvalds1da177e2005-04-16 15:20:36 -070049};
50
David Howells08e0e7c2007-04-26 15:55:03 -070051/*
David Howellsc35eccb2007-04-26 15:58:49 -070052 * CB.InitCallBackState3 operation type
53 */
54static 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,
59};
60
61/*
David Howells08e0e7c2007-04-26 15:55:03 -070062 * CB.Probe operation type
63 */
64static const struct afs_call_type afs_SRXCBProbe = {
David Howells00d3b7a2007-04-26 15:57:07 -070065 .name = "CB.Probe",
David Howells08e0e7c2007-04-26 15:55:03 -070066 .deliver = afs_deliver_cb_probe,
67 .abort_to_error = afs_abort_to_error,
68 .destructor = afs_cm_destructor,
69};
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071/*
David Howellsb908fe62007-04-26 15:58:17 -070072 * CB.GetCapabilities operation type
73 */
74static 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,
79};
80
81/*
David Howells08e0e7c2007-04-26 15:55:03 -070082 * route an incoming cache manager call
83 * - return T if supported, F if not
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 */
David Howells08e0e7c2007-04-26 15:55:03 -070085bool afs_cm_incoming_call(struct afs_call *call)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
David Howells08e0e7c2007-04-26 15:55:03 -070087 u32 operation_id = ntohl(call->operation_ID);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
David Howells08e0e7c2007-04-26 15:55:03 -070089 _enter("{CB.OP %u}", operation_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
David Howells08e0e7c2007-04-26 15:55:03 -070091 switch (operation_id) {
92 case CBCallBack:
93 call->type = &afs_SRXCBCallBack;
94 return true;
95 case CBInitCallBackState:
96 call->type = &afs_SRXCBInitCallBackState;
97 return true;
David Howellsc35eccb2007-04-26 15:58:49 -070098 case CBInitCallBackState3:
99 call->type = &afs_SRXCBInitCallBackState3;
100 return true;
David Howells08e0e7c2007-04-26 15:55:03 -0700101 case CBProbe:
102 call->type = &afs_SRXCBProbe;
103 return true;
David Howellsb908fe62007-04-26 15:58:17 -0700104 case CBGetCapabilities:
105 call->type = &afs_SRXCBGetCapabilites;
106 return true;
David Howells08e0e7c2007-04-26 15:55:03 -0700107 default:
108 return false;
109 }
David Howellsec268152007-04-26 15:49:28 -0700110}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/*
David Howells08e0e7c2007-04-26 15:55:03 -0700113 * clean up a cache manager call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 */
David Howells08e0e7c2007-04-26 15:55:03 -0700115static void afs_cm_destructor(struct afs_call *call)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
David Howells08e0e7c2007-04-26 15:55:03 -0700117 _enter("");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
David Howells08e0e7c2007-04-26 15:55:03 -0700119 afs_put_server(call->server);
120 call->server = NULL;
121 kfree(call->buffer);
122 call->buffer = NULL;
David Howellsec268152007-04-26 15:49:28 -0700123}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125/*
David Howells08e0e7c2007-04-26 15:55:03 -0700126 * allow the fileserver to see if the cache manager is still alive
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 */
David Howells08e0e7c2007-04-26 15:55:03 -0700128static void SRXAFSCB_CallBack(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
David Howells08e0e7c2007-04-26 15:55:03 -0700130 struct afs_call *call = container_of(work, struct afs_call, work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
David Howells08e0e7c2007-04-26 15:55:03 -0700132 _enter("");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
David Howells08e0e7c2007-04-26 15:55:03 -0700134 /* 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
138 * yet */
139 afs_send_empty_reply(call);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
David Howells08e0e7c2007-04-26 15:55:03 -0700141 afs_break_callbacks(call->server, call->count, call->request);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700143}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145/*
David Howells08e0e7c2007-04-26 15:55:03 -0700146 * deliver request data to a CB.CallBack call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 */
David Howells08e0e7c2007-04-26 15:55:03 -0700148static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
149 bool last)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
David Howells08e0e7c2007-04-26 15:55:03 -0700151 struct afs_callback *cb;
152 struct afs_server *server;
153 struct in_addr addr;
154 __be32 *bp;
155 u32 tmp;
156 int ret, loop;
157
158 _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
159
160 switch (call->unmarshall) {
161 case 0:
162 call->offset = 0;
163 call->unmarshall++;
164
165 /* extract the FID array and its count in two steps */
166 case 1:
167 _debug("extract FID count");
168 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
169 switch (ret) {
170 case 0: break;
171 case -EAGAIN: return 0;
172 default: return ret;
173 }
174
175 call->count = ntohl(call->tmp);
176 _debug("FID count: %u", call->count);
177 if (call->count > AFSCBMAX)
178 return -EBADMSG;
179
180 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
181 if (!call->buffer)
182 return -ENOMEM;
183 call->offset = 0;
184 call->unmarshall++;
185
186 case 2:
187 _debug("extract FID array");
188 ret = afs_extract_data(call, skb, last, call->buffer,
189 call->count * 3 * 4);
190 switch (ret) {
191 case 0: break;
192 case -EAGAIN: return 0;
193 default: return ret;
194 }
195
196 _debug("unmarshall FID array");
197 call->request = kcalloc(call->count,
198 sizeof(struct afs_callback),
199 GFP_KERNEL);
200 if (!call->request)
201 return -ENOMEM;
202
203 cb = call->request;
204 bp = call->buffer;
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;
210 }
211
212 call->offset = 0;
213 call->unmarshall++;
214
215 /* extract the callback array and its count in two steps */
216 case 3:
217 _debug("extract CB count");
218 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
219 switch (ret) {
220 case 0: break;
221 case -EAGAIN: return 0;
222 default: return ret;
223 }
224
225 tmp = ntohl(call->tmp);
226 _debug("CB count: %u", tmp);
227 if (tmp != call->count && tmp != 0)
228 return -EBADMSG;
229 call->offset = 0;
230 call->unmarshall++;
231 if (tmp == 0)
232 goto empty_cb_array;
233
234 case 4:
235 _debug("extract CB array");
236 ret = afs_extract_data(call, skb, last, call->request,
237 call->count * 3 * 4);
238 switch (ret) {
239 case 0: break;
240 case -EAGAIN: return 0;
241 default: return ret;
242 }
243
244 _debug("unmarshall CB array");
245 cb = call->request;
246 bp = call->buffer;
247 for (loop = call->count; loop > 0; loop--, cb++) {
248 cb->version = ntohl(*bp++);
249 cb->expiry = ntohl(*bp++);
250 cb->type = ntohl(*bp++);
251 }
252
253 empty_cb_array:
254 call->offset = 0;
255 call->unmarshall++;
256
257 case 5:
258 _debug("trailer");
259 if (skb->len != 0)
260 return -EBADMSG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 break;
262 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
David Howells08e0e7c2007-04-26 15:55:03 -0700264 if (!last)
265 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
David Howells08e0e7c2007-04-26 15:55:03 -0700267 call->state = AFS_CALL_REPLYING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
David Howells08e0e7c2007-04-26 15:55:03 -0700269 /* 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);
273 if (!server)
274 return -ENOTCONN;
275 call->server = server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
David Howells08e0e7c2007-04-26 15:55:03 -0700277 INIT_WORK(&call->work, SRXAFSCB_CallBack);
278 schedule_work(&call->work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 return 0;
David Howellsec268152007-04-26 15:49:28 -0700280}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282/*
David Howells08e0e7c2007-04-26 15:55:03 -0700283 * allow the fileserver to request callback state (re-)initialisation
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 */
David Howells08e0e7c2007-04-26 15:55:03 -0700285static void SRXAFSCB_InitCallBackState(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
David Howells08e0e7c2007-04-26 15:55:03 -0700287 struct afs_call *call = container_of(work, struct afs_call, work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
David Howells08e0e7c2007-04-26 15:55:03 -0700289 _enter("{%p}", call->server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
David Howells08e0e7c2007-04-26 15:55:03 -0700291 afs_init_callback_state(call->server);
292 afs_send_empty_reply(call);
293 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700294}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296/*
David Howells08e0e7c2007-04-26 15:55:03 -0700297 * deliver request data to a CB.InitCallBackState call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 */
David Howells08e0e7c2007-04-26 15:55:03 -0700299static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
300 struct sk_buff *skb,
301 bool last)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 struct afs_server *server;
David Howells08e0e7c2007-04-26 15:55:03 -0700304 struct in_addr addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
David Howells08e0e7c2007-04-26 15:55:03 -0700306 _enter(",{%u},%d", skb->len, last);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
David Howells08e0e7c2007-04-26 15:55:03 -0700308 if (skb->len > 0)
309 return -EBADMSG;
310 if (!last)
311 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
David Howells08e0e7c2007-04-26 15:55:03 -0700313 /* no unmarshalling required */
314 call->state = AFS_CALL_REPLYING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
David Howells08e0e7c2007-04-26 15:55:03 -0700316 /* 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);
320 if (!server)
321 return -ENOTCONN;
322 call->server = server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
David Howells08e0e7c2007-04-26 15:55:03 -0700324 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
325 schedule_work(&call->work);
326 return 0;
David Howellsec268152007-04-26 15:49:28 -0700327}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329/*
David Howellsc35eccb2007-04-26 15:58:49 -0700330 * deliver request data to a CB.InitCallBackState3 call
331 */
332static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
333 struct sk_buff *skb,
334 bool last)
335{
336 struct afs_server *server;
337 struct in_addr addr;
338
339 _enter(",{%u},%d", skb->len, last);
340
341 if (!last)
342 return 0;
343
344 /* no unmarshalling required */
345 call->state = AFS_CALL_REPLYING;
346
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);
351 if (!server)
352 return -ENOTCONN;
353 call->server = server;
354
355 INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
356 schedule_work(&call->work);
357 return 0;
358}
359
360/*
David Howells08e0e7c2007-04-26 15:55:03 -0700361 * allow the fileserver to see if the cache manager is still alive
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 */
David Howells08e0e7c2007-04-26 15:55:03 -0700363static void SRXAFSCB_Probe(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
David Howells08e0e7c2007-04-26 15:55:03 -0700365 struct afs_call *call = container_of(work, struct afs_call, work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
David Howells08e0e7c2007-04-26 15:55:03 -0700367 _enter("");
368 afs_send_empty_reply(call);
369 _leave("");
David Howellsec268152007-04-26 15:49:28 -0700370}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372/*
David Howells08e0e7c2007-04-26 15:55:03 -0700373 * deliver request data to a CB.Probe call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 */
David Howells08e0e7c2007-04-26 15:55:03 -0700375static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
376 bool last)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
David Howells08e0e7c2007-04-26 15:55:03 -0700378 _enter(",{%u},%d", skb->len, last);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
David Howells08e0e7c2007-04-26 15:55:03 -0700380 if (skb->len > 0)
381 return -EBADMSG;
382 if (!last)
383 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
David Howells08e0e7c2007-04-26 15:55:03 -0700385 /* no unmarshalling required */
386 call->state = AFS_CALL_REPLYING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
David Howells08e0e7c2007-04-26 15:55:03 -0700388 INIT_WORK(&call->work, SRXAFSCB_Probe);
389 schedule_work(&call->work);
390 return 0;
David Howellsec268152007-04-26 15:49:28 -0700391}
David Howellsb908fe62007-04-26 15:58:17 -0700392
393/*
394 * allow the fileserver to ask about the cache manager's capabilities
395 */
396static void SRXAFSCB_GetCapabilities(struct work_struct *work)
397{
398 struct afs_interface *ifs;
399 struct afs_call *call = container_of(work, struct afs_call, work);
400 int loop, nifs;
401
402 struct {
403 struct /* InterfaceAddr */ {
404 __be32 nifs;
405 __be32 uuid[11];
406 __be32 ifaddr[32];
407 __be32 netmask[32];
408 __be32 mtu[32];
409 } ia;
410 struct /* Capabilities */ {
411 __be32 capcount;
412 __be32 caps[1];
413 } cap;
414 } reply;
415
416 _enter("");
417
418 nifs = 0;
419 ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
420 if (ifs) {
421 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
422 if (nifs < 0) {
423 kfree(ifs);
424 ifs = NULL;
425 nifs = 0;
426 }
427 }
428
429 memset(&reply, 0, sizeof(reply));
430 reply.ia.nifs = htonl(nifs);
431
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]);
439
440 if (ifs) {
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);
445 }
Patrick McHardy5b35fad2007-05-03 03:27:39 -0700446 kfree(ifs);
David Howellsb908fe62007-04-26 15:58:17 -0700447 }
448
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));
452
453 _leave("");
454}
455
456/*
457 * deliver request data to a CB.GetCapabilities call
458 */
459static int afs_deliver_cb_get_capabilities(struct afs_call *call,
460 struct sk_buff *skb, bool last)
461{
462 _enter(",{%u},%d", skb->len, last);
463
464 if (skb->len > 0)
465 return -EBADMSG;
466 if (!last)
467 return 0;
468
469 /* no unmarshalling required */
470 call->state = AFS_CALL_REPLYING;
471
472 INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
473 schedule_work(&call->work);
474 return 0;
475}