]>
Commit | Line | Data |
---|---|---|
ec26815a | 1 | /* AFS Cache Manager Service |
1da177e4 LT |
2 | * |
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> | |
08e0e7c8 | 15 | #include <linux/ip.h> |
1da177e4 | 16 | #include "internal.h" |
08e0e7c8 | 17 | #include "afs_cm.h" |
1da177e4 | 18 | |
08e0e7c8 | 19 | struct workqueue_struct *afs_cm_workqueue; |
1da177e4 | 20 | |
08e0e7c8 DH |
21 | static int afs_deliver_cb_init_call_back_state(struct afs_call *, |
22 | struct sk_buff *, bool); | |
c35eccb1 DH |
23 | static int afs_deliver_cb_init_call_back_state3(struct afs_call *, |
24 | struct sk_buff *, bool); | |
08e0e7c8 DH |
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); | |
b908fe6b DH |
27 | static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *, |
28 | bool); | |
08e0e7c8 | 29 | static void afs_cm_destructor(struct afs_call *); |
1da177e4 | 30 | |
1da177e4 | 31 | /* |
08e0e7c8 | 32 | * CB.CallBack operation type |
1da177e4 | 33 | */ |
08e0e7c8 | 34 | static const struct afs_call_type afs_SRXCBCallBack = { |
00d3b7a4 | 35 | .name = "CB.CallBack", |
08e0e7c8 DH |
36 | .deliver = afs_deliver_cb_callback, |
37 | .abort_to_error = afs_abort_to_error, | |
38 | .destructor = afs_cm_destructor, | |
39 | }; | |
1da177e4 | 40 | |
1da177e4 | 41 | /* |
08e0e7c8 | 42 | * CB.InitCallBackState operation type |
1da177e4 | 43 | */ |
08e0e7c8 | 44 | static const struct afs_call_type afs_SRXCBInitCallBackState = { |
00d3b7a4 | 45 | .name = "CB.InitCallBackState", |
08e0e7c8 DH |
46 | .deliver = afs_deliver_cb_init_call_back_state, |
47 | .abort_to_error = afs_abort_to_error, | |
48 | .destructor = afs_cm_destructor, | |
49 | }; | |
1da177e4 | 50 | |
c35eccb1 DH |
51 | /* |
52 | * CB.InitCallBackState3 operation type | |
53 | */ | |
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, | |
59 | }; | |
60 | ||
1da177e4 | 61 | /* |
08e0e7c8 | 62 | * CB.Probe operation type |
1da177e4 | 63 | */ |
08e0e7c8 | 64 | static const struct afs_call_type afs_SRXCBProbe = { |
00d3b7a4 | 65 | .name = "CB.Probe", |
08e0e7c8 DH |
66 | .deliver = afs_deliver_cb_probe, |
67 | .abort_to_error = afs_abort_to_error, | |
68 | .destructor = afs_cm_destructor, | |
69 | }; | |
1da177e4 | 70 | |
b908fe6b DH |
71 | /* |
72 | * CB.GetCapabilities operation type | |
73 | */ | |
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, | |
79 | }; | |
80 | ||
1da177e4 | 81 | /* |
08e0e7c8 DH |
82 | * route an incoming cache manager call |
83 | * - return T if supported, F if not | |
1da177e4 | 84 | */ |
08e0e7c8 | 85 | bool afs_cm_incoming_call(struct afs_call *call) |
1da177e4 | 86 | { |
08e0e7c8 DH |
87 | u32 operation_id = ntohl(call->operation_ID); |
88 | ||
89 | _enter("{CB.OP %u}", operation_id); | |
90 | ||
91 | 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; | |
c35eccb1 DH |
98 | case CBInitCallBackState3: |
99 | call->type = &afs_SRXCBInitCallBackState3; | |
100 | return true; | |
08e0e7c8 DH |
101 | case CBProbe: |
102 | call->type = &afs_SRXCBProbe; | |
103 | return true; | |
b908fe6b DH |
104 | case CBGetCapabilities: |
105 | call->type = &afs_SRXCBGetCapabilites; | |
106 | return true; | |
08e0e7c8 DH |
107 | default: |
108 | return false; | |
1da177e4 | 109 | } |
ec26815a | 110 | } |
1da177e4 | 111 | |
1da177e4 | 112 | /* |
08e0e7c8 | 113 | * clean up a cache manager call |
1da177e4 | 114 | */ |
08e0e7c8 | 115 | static void afs_cm_destructor(struct afs_call *call) |
1da177e4 | 116 | { |
08e0e7c8 DH |
117 | _enter(""); |
118 | ||
119 | afs_put_server(call->server); | |
120 | call->server = NULL; | |
121 | kfree(call->buffer); | |
122 | call->buffer = NULL; | |
ec26815a | 123 | } |
1da177e4 | 124 | |
1da177e4 | 125 | /* |
08e0e7c8 | 126 | * allow the fileserver to see if the cache manager is still alive |
1da177e4 | 127 | */ |
08e0e7c8 | 128 | static void SRXAFSCB_CallBack(struct work_struct *work) |
1da177e4 | 129 | { |
08e0e7c8 | 130 | struct afs_call *call = container_of(work, struct afs_call, work); |
1da177e4 | 131 | |
08e0e7c8 | 132 | _enter(""); |
1da177e4 | 133 | |
08e0e7c8 DH |
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 | |
138 | * yet */ | |
139 | afs_send_empty_reply(call); | |
1da177e4 | 140 | |
08e0e7c8 DH |
141 | afs_break_callbacks(call->server, call->count, call->request); |
142 | _leave(""); | |
ec26815a | 143 | } |
1da177e4 | 144 | |
1da177e4 | 145 | /* |
08e0e7c8 | 146 | * deliver request data to a CB.CallBack call |
1da177e4 | 147 | */ |
08e0e7c8 DH |
148 | static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb, |
149 | bool last) | |
1da177e4 | 150 | { |
08e0e7c8 DH |
151 | 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; | |
1da177e4 | 173 | } |
1da177e4 | 174 | |
08e0e7c8 DH |
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; | |
1da177e4 | 194 | } |
1da177e4 | 195 | |
08e0e7c8 DH |
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; | |
1da177e4 LT |
210 | } |
211 | ||
08e0e7c8 DH |
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 | } | |
1da177e4 | 224 | |
08e0e7c8 DH |
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; | |
1da177e4 | 242 | } |
1da177e4 | 243 | |
08e0e7c8 DH |
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 | } | |
1da177e4 | 252 | |
08e0e7c8 DH |
253 | empty_cb_array: |
254 | call->offset = 0; | |
255 | call->unmarshall++; | |
1da177e4 | 256 | |
08e0e7c8 DH |
257 | case 5: |
258 | _debug("trailer"); | |
259 | if (skb->len != 0) | |
260 | return -EBADMSG; | |
1da177e4 LT |
261 | break; |
262 | } | |
263 | ||
08e0e7c8 DH |
264 | if (!last) |
265 | return 0; | |
1da177e4 | 266 | |
08e0e7c8 | 267 | call->state = AFS_CALL_REPLYING; |
1da177e4 | 268 | |
08e0e7c8 DH |
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); | |
273 | if (!server) | |
274 | return -ENOTCONN; | |
275 | call->server = server; | |
276 | ||
277 | INIT_WORK(&call->work, SRXAFSCB_CallBack); | |
278 | schedule_work(&call->work); | |
279 | return 0; | |
ec26815a | 280 | } |
1da177e4 | 281 | |
1da177e4 | 282 | /* |
08e0e7c8 | 283 | * allow the fileserver to request callback state (re-)initialisation |
1da177e4 | 284 | */ |
08e0e7c8 | 285 | static void SRXAFSCB_InitCallBackState(struct work_struct *work) |
1da177e4 | 286 | { |
08e0e7c8 | 287 | struct afs_call *call = container_of(work, struct afs_call, work); |
1da177e4 | 288 | |
08e0e7c8 | 289 | _enter("{%p}", call->server); |
1da177e4 | 290 | |
08e0e7c8 DH |
291 | afs_init_callback_state(call->server); |
292 | afs_send_empty_reply(call); | |
293 | _leave(""); | |
ec26815a | 294 | } |
1da177e4 | 295 | |
1da177e4 | 296 | /* |
08e0e7c8 | 297 | * deliver request data to a CB.InitCallBackState call |
1da177e4 | 298 | */ |
08e0e7c8 DH |
299 | static int afs_deliver_cb_init_call_back_state(struct afs_call *call, |
300 | struct sk_buff *skb, | |
301 | bool last) | |
1da177e4 LT |
302 | { |
303 | struct afs_server *server; | |
08e0e7c8 | 304 | struct in_addr addr; |
1da177e4 | 305 | |
08e0e7c8 | 306 | _enter(",{%u},%d", skb->len, last); |
1da177e4 | 307 | |
08e0e7c8 DH |
308 | if (skb->len > 0) |
309 | return -EBADMSG; | |
310 | if (!last) | |
311 | return 0; | |
1da177e4 | 312 | |
08e0e7c8 DH |
313 | /* no unmarshalling required */ |
314 | call->state = AFS_CALL_REPLYING; | |
1da177e4 | 315 | |
08e0e7c8 DH |
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); | |
320 | if (!server) | |
321 | return -ENOTCONN; | |
322 | call->server = server; | |
1da177e4 | 323 | |
08e0e7c8 DH |
324 | INIT_WORK(&call->work, SRXAFSCB_InitCallBackState); |
325 | schedule_work(&call->work); | |
326 | return 0; | |
327 | } | |
1da177e4 | 328 | |
c35eccb1 DH |
329 | /* |
330 | * deliver request data to a CB.InitCallBackState3 call | |
331 | */ | |
332 | static 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 | ||
08e0e7c8 DH |
360 | /* |
361 | * allow the fileserver to see if the cache manager is still alive | |
362 | */ | |
363 | static void SRXAFSCB_Probe(struct work_struct *work) | |
364 | { | |
365 | struct afs_call *call = container_of(work, struct afs_call, work); | |
1da177e4 | 366 | |
08e0e7c8 DH |
367 | _enter(""); |
368 | afs_send_empty_reply(call); | |
369 | _leave(""); | |
370 | } | |
1da177e4 | 371 | |
08e0e7c8 DH |
372 | /* |
373 | * deliver request data to a CB.Probe call | |
374 | */ | |
375 | static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb, | |
376 | bool last) | |
377 | { | |
378 | _enter(",{%u},%d", skb->len, last); | |
1da177e4 | 379 | |
08e0e7c8 DH |
380 | if (skb->len > 0) |
381 | return -EBADMSG; | |
382 | if (!last) | |
383 | return 0; | |
1da177e4 | 384 | |
08e0e7c8 DH |
385 | /* no unmarshalling required */ |
386 | call->state = AFS_CALL_REPLYING; | |
1da177e4 | 387 | |
08e0e7c8 DH |
388 | INIT_WORK(&call->work, SRXAFSCB_Probe); |
389 | schedule_work(&call->work); | |
390 | return 0; | |
ec26815a | 391 | } |
b908fe6b DH |
392 | |
393 | /* | |
394 | * allow the fileserver to ask about the cache manager's capabilities | |
395 | */ | |
396 | static 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 | } | |
5b35fad9 | 446 | kfree(ifs); |
b908fe6b DH |
447 | } |
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 | */ | |
459 | static 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 | } |