fs/afs/cmservice.c

   1 /* AFS Cache Manager Service
   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/slab.h>
  15 #include <linux/sched.h>
  16 #include <linux/ip.h>
  17 #include "internal.h"
  18 #include "afs_cm.h"
  19
  20 #if 0
  21 struct workqueue_struct *afs_cm_workqueue;
  22 #endif  /*  0  */
  23
  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 *);
  34
  35 /*
  36  * CB.CallBack operation type
  37  */
  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,
  43 };
  44
  45 /*
  46  * CB.InitCallBackState operation type
  47  */
  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,
  53 };
  54
  55 /*
  56  * CB.InitCallBackState3 operation type
  57  */
  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,
  63 };
  64
  65 /*
  66  * CB.Probe operation type
  67  */
  68 static const struct afs_call_type afs_SRXCBProbe = {
  69         .name           = "CB.Probe",
  70         .deliver        = afs_deliver_cb_probe,
  71         .abort_to_error = afs_abort_to_error,
  72         .destructor     = afs_cm_destructor,
  73 };
  74
  75 /*
  76  * CB.ProbeUuid operation type
  77  */
  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,
  83 };
  84
  85 /*
  86  * CB.TellMeAboutYourself operation type
  87  */
  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,
  93 };
  94
  95 /*
  96  * route an incoming cache manager call
  97  * - return T if supported, F if not
  98  */
  99 bool afs_cm_incoming_call(struct afs_call *call)
 100 {
 101         u32 operation_id = ntohl(call->operation_ID);
 102
 103         _enter("{CB.OP %u}", operation_id);
 104
 105         switch (operation_id) {
 106         case CBCallBack:
 107                 call->type = &afs_SRXCBCallBack;
 108                 return true;
 109         case CBInitCallBackState:
 110                 call->type = &afs_SRXCBInitCallBackState;
 111                 return true;
 112         case CBInitCallBackState3:
 113                 call->type = &afs_SRXCBInitCallBackState3;
 114                 return true;
 115         case CBProbe:
 116                 call->type = &afs_SRXCBProbe;
 117                 return true;
 118         case CBTellMeAboutYourself:
 119                 call->type = &afs_SRXCBTellMeAboutYourself;
 120                 return true;
 121         default:
 122                 return false;
 123         }
 124 }
 125
 126 /*
 127  * clean up a cache manager call
 128  */
 129 static void afs_cm_destructor(struct afs_call *call)
 130 {
 131         _enter("");
 132
 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().
 136          */
 137         if (call->unmarshall == 6) {
 138                 ASSERT(call->server && call->count && call->request);
 139                 afs_break_callbacks(call->server, call->count, call->request);
 140         }
 141
 142         afs_put_server(call->server);
 143         call->server = NULL;
 144         kfree(call->buffer);
 145         call->buffer = NULL;
 146 }
 147
 148 /*
 149  * allow the fileserver to see if the cache manager is still alive
 150  */
 151 static void SRXAFSCB_CallBack(struct work_struct *work)
 152 {
 153         struct afs_call *call = container_of(work, struct afs_call, work);
 154
 155         _enter("");
 156
 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
 161          * yet */
 162         afs_send_empty_reply(call);
 163
 164         afs_break_callbacks(call->server, call->count, call->request);
 165         _leave("");
 166 }
 167
 168 /*
 169  * deliver request data to a CB.CallBack call
 170  */
 171 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
 172                                    bool last)
 173 {
 174         struct afs_callback *cb;
 175         struct afs_server *server;
 176         struct in_addr addr;
 177         __be32 *bp;
 178         u32 tmp;
 179         int ret, loop;
 180
 181         _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
 182
 183         switch (call->unmarshall) {
 184         case 0:
 185                 call->offset = 0;
 186                 call->unmarshall++;
 187
 188                 /* extract the FID array and its count in two steps */
 189         case 1:
 190                 _debug("extract FID count");
 191                 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
 192                 if (ret < 0)
 193                         return ret;
 194
 195                 call->count = ntohl(call->tmp);
 196                 _debug("FID count: %u", call->count);
 197                 if (call->count > AFSCBMAX)
 198                         return -EBADMSG;
 199
 200                 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
 201                 if (!call->buffer)
 202                         return -ENOMEM;
 203                 call->offset = 0;
 204                 call->unmarshall++;
 205
 206         case 2:
 207                 _debug("extract FID array");
 208                 ret = afs_extract_data(call, skb, last, call->buffer,
 209                                        call->count * 3 * 4);
 210                 if (ret < 0)
 211                         return ret;
 212
 213                 _debug("unmarshall FID array");
 214                 call->request = kcalloc(call->count,
 215                                         sizeof(struct afs_callback),
 216                                         GFP_KERNEL);
 217                 if (!call->request)
 218                         return -ENOMEM;
 219
 220                 cb = call->request;
 221                 bp = call->buffer;
 222                 for (loop = call->count; loop > 0; loop--, cb++) {
 223                         cb->fid.vid     = ntohl(*bp++);
 224                         cb->fid.vnode   = ntohl(*bp++);
 225                         cb->fid.unique  = ntohl(*bp++);
 226                         cb->type        = AFSCM_CB_UNTYPED;
 227                 }
 228
 229                 call->offset = 0;
 230                 call->unmarshall++;
 231
 232                 /* extract the callback array and its count in two steps */
 233         case 3:
 234                 _debug("extract CB count");
 235                 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
 236                 if (ret < 0)
 237                         return ret;
 238
 239                 tmp = ntohl(call->tmp);
 240                 _debug("CB count: %u", tmp);
 241                 if (tmp != call->count && tmp != 0)
 242                         return -EBADMSG;
 243                 call->offset = 0;
 244                 call->unmarshall++;
 245                 if (tmp == 0)
 246                         goto empty_cb_array;
 247
 248         case 4:
 249                 _debug("extract CB array");
 250                 ret = afs_extract_data(call, skb, last, call->request,
 251                                        call->count * 3 * 4);
 252                 if (ret < 0)
 253                         return ret;
 254
 255                 _debug("unmarshall CB array");
 256                 cb = call->request;
 257                 bp = call->buffer;
 258                 for (loop = call->count; loop > 0; loop--, cb++) {
 259                         cb->version     = ntohl(*bp++);
 260                         cb->expiry      = ntohl(*bp++);
 261                         cb->type        = ntohl(*bp++);
 262                 }
 263
 264         empty_cb_array:
 265                 call->offset = 0;
 266                 call->unmarshall++;
 267
 268         case 5:
 269                 ret = afs_data_complete(call, skb, last);
 270                 if (ret < 0)
 271                         return ret;
 272
 273                 /* Record that the message was unmarshalled successfully so
 274                  * that the call destructor can know do the callback breaking
 275                  * work, even if the final ACK isn't received.
 276                  *
 277                  * If the step number changes, then afs_cm_destructor() must be
 278                  * updated also.
 279                  */
 280                 call->unmarshall++;
 281         case 6:
 282                 break;
 283         }
 284
 285
 286         call->state = AFS_CALL_REPLYING;
 287
 288         /* we'll need the file server record as that tells us which set of
 289          * vnodes to operate upon */
 290         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 291         server = afs_find_server(&addr);
 292         if (!server)
 293                 return -ENOTCONN;
 294         call->server = server;
 295
 296         INIT_WORK(&call->work, SRXAFSCB_CallBack);
 297         queue_work(afs_wq, &call->work);
 298         return 0;
 299 }
 300
 301 /*
 302  * allow the fileserver to request callback state (re-)initialisation
 303  */
 304 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
 305 {
 306         struct afs_call *call = container_of(work, struct afs_call, work);
 307
 308         _enter("{%p}", call->server);
 309
 310         afs_init_callback_state(call->server);
 311         afs_send_empty_reply(call);
 312         _leave("");
 313 }
 314
 315 /*
 316  * deliver request data to a CB.InitCallBackState call
 317  */
 318 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
 319                                                struct sk_buff *skb,
 320                                                bool last)
 321 {
 322         struct afs_server *server;
 323         struct in_addr addr;
 324         int ret;
 325
 326         _enter(",{%u},%d", skb->len, last);
 327
 328         ret = afs_data_complete(call, skb, last);
 329         if (ret < 0)
 330                 return ret;
 331
 332         /* no unmarshalling required */
 333         call->state = AFS_CALL_REPLYING;
 334
 335         /* we'll need the file server record as that tells us which set of
 336          * vnodes to operate upon */
 337         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 338         server = afs_find_server(&addr);
 339         if (!server)
 340                 return -ENOTCONN;
 341         call->server = server;
 342
 343         INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
 344         queue_work(afs_wq, &call->work);
 345         return 0;
 346 }
 347
 348 /*
 349  * deliver request data to a CB.InitCallBackState3 call
 350  */
 351 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
 352                                                 struct sk_buff *skb,
 353                                                 bool last)
 354 {
 355         struct afs_server *server;
 356         struct in_addr addr;
 357
 358         _enter(",{%u},%d", skb->len, last);
 359
 360         /* There are some arguments that we ignore */
 361         afs_data_consumed(call, skb);
 362         if (!last)
 363                 return -EAGAIN;
 364
 365         /* no unmarshalling required */
 366         call->state = AFS_CALL_REPLYING;
 367
 368         /* we'll need the file server record as that tells us which set of
 369          * vnodes to operate upon */
 370         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 371         server = afs_find_server(&addr);
 372         if (!server)
 373                 return -ENOTCONN;
 374         call->server = server;
 375
 376         INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
 377         queue_work(afs_wq, &call->work);
 378         return 0;
 379 }
 380
 381 /*
 382  * allow the fileserver to see if the cache manager is still alive
 383  */
 384 static void SRXAFSCB_Probe(struct work_struct *work)
 385 {
 386         struct afs_call *call = container_of(work, struct afs_call, work);
 387
 388         _enter("");
 389         afs_send_empty_reply(call);
 390         _leave("");
 391 }
 392
 393 /*
 394  * deliver request data to a CB.Probe call
 395  */
 396 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
 397                                 bool last)
 398 {
 399         int ret;
 400
 401         _enter(",{%u},%d", skb->len, last);
 402
 403         ret = afs_data_complete(call, skb, last);
 404         if (ret < 0)
 405                 return ret;
 406
 407         /* no unmarshalling required */
 408         call->state = AFS_CALL_REPLYING;
 409
 410         INIT_WORK(&call->work, SRXAFSCB_Probe);
 411         queue_work(afs_wq, &call->work);
 412         return 0;
 413 }
 414
 415 /*
 416  * allow the fileserver to quickly find out if the fileserver has been rebooted
 417  */
 418 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
 419 {
 420         struct afs_call *call = container_of(work, struct afs_call, work);
 421         struct afs_uuid *r = call->request;
 422
 423         struct {
 424                 __be32  match;
 425         } reply;
 426
 427         _enter("");
 428
 429
 430         if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
 431                 reply.match = htonl(0);
 432         else
 433                 reply.match = htonl(1);
 434
 435         afs_send_simple_reply(call, &reply, sizeof(reply));
 436         _leave("");
 437 }
 438
 439 /*
 440  * deliver request data to a CB.ProbeUuid call
 441  */
 442 static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
 443                                      bool last)
 444 {
 445         struct afs_uuid *r;
 446         unsigned loop;
 447         __be32 *b;
 448         int ret;
 449
 450         _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
 451
 452         ret = afs_data_complete(call, skb, last);
 453         if (ret < 0)
 454                 return ret;
 455
 456         switch (call->unmarshall) {
 457         case 0:
 458                 call->offset = 0;
 459                 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
 460                 if (!call->buffer)
 461                         return -ENOMEM;
 462                 call->unmarshall++;
 463
 464         case 1:
 465                 _debug("extract UUID");
 466                 ret = afs_extract_data(call, skb, last, call->buffer,
 467                                        11 * sizeof(__be32));
 468                 switch (ret) {
 469                 case 0:         break;
 470                 case -EAGAIN:   return 0;
 471                 default:        return ret;
 472                 }
 473
 474                 _debug("unmarshall UUID");
 475                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
 476                 if (!call->request)
 477                         return -ENOMEM;
 478
 479                 b = call->buffer;
 480                 r = call->request;
 481                 r->time_low                     = ntohl(b[0]);
 482                 r->time_mid                     = ntohl(b[1]);
 483                 r->time_hi_and_version          = ntohl(b[2]);
 484                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
 485                 r->clock_seq_low                = ntohl(b[4]);
 486
 487                 for (loop = 0; loop < 6; loop++)
 488                         r->node[loop] = ntohl(b[loop + 5]);
 489
 490                 call->offset = 0;
 491                 call->unmarshall++;
 492
 493         case 2:
 494                 _debug("trailer");
 495                 if (skb->len != 0)
 496                         return -EBADMSG;
 497                 break;
 498         }
 499
 500         ret = afs_data_complete(call, skb, last);
 501         if (ret < 0)
 502                 return ret;
 503
 504         call->state = AFS_CALL_REPLYING;
 505
 506         INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
 507         queue_work(afs_wq, &call->work);
 508         return 0;
 509 }
 510
 511 /*
 512  * allow the fileserver to ask about the cache manager's capabilities
 513  */
 514 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
 515 {
 516         struct afs_interface *ifs;
 517         struct afs_call *call = container_of(work, struct afs_call, work);
 518         int loop, nifs;
 519
 520         struct {
 521                 struct /* InterfaceAddr */ {
 522                         __be32 nifs;
 523                         __be32 uuid[11];
 524                         __be32 ifaddr[32];
 525                         __be32 netmask[32];
 526                         __be32 mtu[32];
 527                 } ia;
 528                 struct /* Capabilities */ {
 529                         __be32 capcount;
 530                         __be32 caps[1];
 531                 } cap;
 532         } reply;
 533
 534         _enter("");
 535
 536         nifs = 0;
 537         ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
 538         if (ifs) {
 539                 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
 540                 if (nifs < 0) {
 541                         kfree(ifs);
 542                         ifs = NULL;
 543                         nifs = 0;
 544                 }
 545         }
 546
 547         memset(&reply, 0, sizeof(reply));
 548         reply.ia.nifs = htonl(nifs);
 549
 550         reply.ia.uuid[0] = htonl(afs_uuid.time_low);
 551         reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
 552         reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
 553         reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
 554         reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
 555         for (loop = 0; loop < 6; loop++)
 556                 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
 557
 558         if (ifs) {
 559                 for (loop = 0; loop < nifs; loop++) {
 560                         reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
 561                         reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
 562                         reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
 563                 }
 564                 kfree(ifs);
 565         }
 566
 567         reply.cap.capcount = htonl(1);
 568         reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
 569         afs_send_simple_reply(call, &reply, sizeof(reply));
 570
 571         _leave("");
 572 }
 573
 574 /*
 575  * deliver request data to a CB.TellMeAboutYourself call
 576  */
 577 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
 578                                                  struct sk_buff *skb, bool last)
 579 {
 580         int ret;
 581
 582         _enter(",{%u},%d", skb->len, last);
 583
 584         ret = afs_data_complete(call, skb, last);
 585         if (ret < 0)
 586                 return ret;
 587
 588         /* no unmarshalling required */
 589         call->state = AFS_CALL_REPLYING;
 590
 591         INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
 592         queue_work(afs_wq, &call->work);
 593         return 0;
 594 }