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 CBProbeUuid:
 119                 call->type = &afs_SRXCBProbeUuid;
 120                 return true;
 121         case CBTellMeAboutYourself:
 122                 call->type = &afs_SRXCBTellMeAboutYourself;
 123                 return true;
 124         default:
 125                 return false;
 126         }
 127 }
 128
 129 /*
 130  * clean up a cache manager call
 131  */
 132 static void afs_cm_destructor(struct afs_call *call)
 133 {
 134         _enter("");
 135
 136         /* Break the callbacks here so that we do it after the final ACK is
 137          * received.  The step number here must match the final number in
 138          * afs_deliver_cb_callback().
 139          */
 140         if (call->unmarshall == 6) {
 141                 ASSERT(call->server && call->count && call->request);
 142                 afs_break_callbacks(call->server, call->count, call->request);
 143         }
 144
 145         afs_put_server(call->server);
 146         call->server = NULL;
 147         kfree(call->buffer);
 148         call->buffer = NULL;
 149 }
 150
 151 /*
 152  * allow the fileserver to see if the cache manager is still alive
 153  */
 154 static void SRXAFSCB_CallBack(struct work_struct *work)
 155 {
 156         struct afs_call *call = container_of(work, struct afs_call, work);
 157
 158         _enter("");
 159
 160         /* be sure to send the reply *before* attempting to spam the AFS server
 161          * with FSFetchStatus requests on the vnodes with broken callbacks lest
 162          * the AFS server get into a vicious cycle of trying to break further
 163          * callbacks because it hadn't received completion of the CBCallBack op
 164          * yet */
 165         afs_send_empty_reply(call);
 166
 167         afs_break_callbacks(call->server, call->count, call->request);
 168         _leave("");
 169 }
 170
 171 /*
 172  * deliver request data to a CB.CallBack call
 173  */
 174 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
 175                                    bool last)
 176 {
 177         struct afs_callback *cb;
 178         struct afs_server *server;
 179         struct in_addr addr;
 180         __be32 *bp;
 181         u32 tmp;
 182         int ret, loop;
 183
 184         _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
 185
 186         switch (call->unmarshall) {
 187         case 0:
 188                 call->offset = 0;
 189                 call->unmarshall++;
 190
 191                 /* extract the FID array and its count in two steps */
 192         case 1:
 193                 _debug("extract FID count");
 194                 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
 195                 switch (ret) {
 196                 case 0:         break;
 197                 case -EAGAIN:   return 0;
 198                 default:        return ret;
 199                 }
 200
 201                 call->count = ntohl(call->tmp);
 202                 _debug("FID count: %u", call->count);
 203                 if (call->count > AFSCBMAX)
 204                         return -EBADMSG;
 205
 206                 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
 207                 if (!call->buffer)
 208                         return -ENOMEM;
 209                 call->offset = 0;
 210                 call->unmarshall++;
 211
 212         case 2:
 213                 _debug("extract FID array");
 214                 ret = afs_extract_data(call, skb, last, call->buffer,
 215                                        call->count * 3 * 4);
 216                 switch (ret) {
 217                 case 0:         break;
 218                 case -EAGAIN:   return 0;
 219                 default:        return ret;
 220                 }
 221
 222                 _debug("unmarshall FID array");
 223                 call->request = kcalloc(call->count,
 224                                         sizeof(struct afs_callback),
 225                                         GFP_KERNEL);
 226                 if (!call->request)
 227                         return -ENOMEM;
 228
 229                 cb = call->request;
 230                 bp = call->buffer;
 231                 for (loop = call->count; loop > 0; loop--, cb++) {
 232                         cb->fid.vid     = ntohl(*bp++);
 233                         cb->fid.vnode   = ntohl(*bp++);
 234                         cb->fid.unique  = ntohl(*bp++);
 235                         cb->type        = AFSCM_CB_UNTYPED;
 236                 }
 237
 238                 call->offset = 0;
 239                 call->unmarshall++;
 240
 241                 /* extract the callback array and its count in two steps */
 242         case 3:
 243                 _debug("extract CB count");
 244                 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
 245                 switch (ret) {
 246                 case 0:         break;
 247                 case -EAGAIN:   return 0;
 248                 default:        return ret;
 249                 }
 250
 251                 tmp = ntohl(call->tmp);
 252                 _debug("CB count: %u", tmp);
 253                 if (tmp != call->count && tmp != 0)
 254                         return -EBADMSG;
 255                 call->offset = 0;
 256                 call->unmarshall++;
 257                 if (tmp == 0)
 258                         goto empty_cb_array;
 259
 260         case 4:
 261                 _debug("extract CB array");
 262                 ret = afs_extract_data(call, skb, last, call->request,
 263                                        call->count * 3 * 4);
 264                 switch (ret) {
 265                 case 0:         break;
 266                 case -EAGAIN:   return 0;
 267                 default:        return ret;
 268                 }
 269
 270                 _debug("unmarshall CB array");
 271                 cb = call->request;
 272                 bp = call->buffer;
 273                 for (loop = call->count; loop > 0; loop--, cb++) {
 274                         cb->version     = ntohl(*bp++);
 275                         cb->expiry      = ntohl(*bp++);
 276                         cb->type        = ntohl(*bp++);
 277                 }
 278
 279         empty_cb_array:
 280                 call->offset = 0;
 281                 call->unmarshall++;
 282
 283         case 5:
 284                 _debug("trailer");
 285                 if (skb->len != 0)
 286                         return -EBADMSG;
 287
 288                 /* Record that the message was unmarshalled successfully so
 289                  * that the call destructor can know do the callback breaking
 290                  * work, even if the final ACK isn't received.
 291                  *
 292                  * If the step number changes, then afs_cm_destructor() must be
 293                  * updated also.
 294                  */
 295                 call->unmarshall++;
 296         case 6:
 297                 break;
 298         }
 299
 300         if (!last)
 301                 return 0;
 302
 303         call->state = AFS_CALL_REPLYING;
 304
 305         /* we'll need the file server record as that tells us which set of
 306          * vnodes to operate upon */
 307         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 308         server = afs_find_server(&addr);
 309         if (!server)
 310                 return -ENOTCONN;
 311         call->server = server;
 312
 313         INIT_WORK(&call->work, SRXAFSCB_CallBack);
 314         queue_work(afs_wq, &call->work);
 315         return 0;
 316 }
 317
 318 /*
 319  * allow the fileserver to request callback state (re-)initialisation
 320  */
 321 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
 322 {
 323         struct afs_call *call = container_of(work, struct afs_call, work);
 324
 325         _enter("{%p}", call->server);
 326
 327         afs_init_callback_state(call->server);
 328         afs_send_empty_reply(call);
 329         _leave("");
 330 }
 331
 332 /*
 333  * deliver request data to a CB.InitCallBackState call
 334  */
 335 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
 336                                                struct sk_buff *skb,
 337                                                bool last)
 338 {
 339         struct afs_server *server;
 340         struct in_addr addr;
 341
 342         _enter(",{%u},%d", skb->len, last);
 343
 344         if (skb->len > 0)
 345                 return -EBADMSG;
 346         if (!last)
 347                 return 0;
 348
 349         /* no unmarshalling required */
 350         call->state = AFS_CALL_REPLYING;
 351
 352         /* we'll need the file server record as that tells us which set of
 353          * vnodes to operate upon */
 354         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 355         server = afs_find_server(&addr);
 356         if (!server)
 357                 return -ENOTCONN;
 358         call->server = server;
 359
 360         INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
 361         queue_work(afs_wq, &call->work);
 362         return 0;
 363 }
 364
 365 /*
 366  * deliver request data to a CB.InitCallBackState3 call
 367  */
 368 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
 369                                                 struct sk_buff *skb,
 370                                                 bool last)
 371 {
 372         struct afs_server *server;
 373         struct in_addr addr;
 374
 375         _enter(",{%u},%d", skb->len, last);
 376
 377         if (!last)
 378                 return 0;
 379
 380         /* no unmarshalling required */
 381         call->state = AFS_CALL_REPLYING;
 382
 383         /* we'll need the file server record as that tells us which set of
 384          * vnodes to operate upon */
 385         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 386         server = afs_find_server(&addr);
 387         if (!server)
 388                 return -ENOTCONN;
 389         call->server = server;
 390
 391         INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
 392         queue_work(afs_wq, &call->work);
 393         return 0;
 394 }
 395
 396 /*
 397  * allow the fileserver to see if the cache manager is still alive
 398  */
 399 static void SRXAFSCB_Probe(struct work_struct *work)
 400 {
 401         struct afs_call *call = container_of(work, struct afs_call, work);
 402
 403         _enter("");
 404         afs_send_empty_reply(call);
 405         _leave("");
 406 }
 407
 408 /*
 409  * deliver request data to a CB.Probe call
 410  */
 411 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
 412                                 bool last)
 413 {
 414         _enter(",{%u},%d", skb->len, last);
 415
 416         if (skb->len > 0)
 417                 return -EBADMSG;
 418         if (!last)
 419                 return 0;
 420
 421         /* no unmarshalling required */
 422         call->state = AFS_CALL_REPLYING;
 423
 424         INIT_WORK(&call->work, SRXAFSCB_Probe);
 425         queue_work(afs_wq, &call->work);
 426         return 0;
 427 }
 428
 429 /*
 430  * allow the fileserver to quickly find out if the fileserver has been rebooted
 431  */
 432 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
 433 {
 434         struct afs_call *call = container_of(work, struct afs_call, work);
 435         struct afs_uuid *r = call->request;
 436
 437         struct {
 438                 __be32  match;
 439         } reply;
 440
 441         _enter("");
 442
 443
 444         if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
 445                 reply.match = htonl(0);
 446         else
 447                 reply.match = htonl(1);
 448
 449         afs_send_simple_reply(call, &reply, sizeof(reply));
 450         _leave("");
 451 }
 452
 453 /*
 454  * deliver request data to a CB.ProbeUuid call
 455  */
 456 static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
 457                                      bool last)
 458 {
 459         struct afs_uuid *r;
 460         unsigned loop;
 461         __be32 *b;
 462         int ret;
 463
 464         _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
 465
 466         if (skb->len > 0)
 467                 return -EBADMSG;
 468         if (!last)
 469                 return 0;
 470
 471         switch (call->unmarshall) {
 472         case 0:
 473                 call->offset = 0;
 474                 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
 475                 if (!call->buffer)
 476                         return -ENOMEM;
 477                 call->unmarshall++;
 478
 479         case 1:
 480                 _debug("extract UUID");
 481                 ret = afs_extract_data(call, skb, last, call->buffer,
 482                                        11 * sizeof(__be32));
 483                 switch (ret) {
 484                 case 0:         break;
 485                 case -EAGAIN:   return 0;
 486                 default:        return ret;
 487                 }
 488
 489                 _debug("unmarshall UUID");
 490                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
 491                 if (!call->request)
 492                         return -ENOMEM;
 493
 494                 b = call->buffer;
 495                 r = call->request;
 496                 r->time_low                     = ntohl(b[0]);
 497                 r->time_mid                     = ntohl(b[1]);
 498                 r->time_hi_and_version          = ntohl(b[2]);
 499                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
 500                 r->clock_seq_low                = ntohl(b[4]);
 501
 502                 for (loop = 0; loop < 6; loop++)
 503                         r->node[loop] = ntohl(b[loop + 5]);
 504
 505                 call->offset = 0;
 506                 call->unmarshall++;
 507
 508         case 2:
 509                 _debug("trailer");
 510                 if (skb->len != 0)
 511                         return -EBADMSG;
 512                 break;
 513         }
 514
 515         if (!last)
 516                 return 0;
 517
 518         call->state = AFS_CALL_REPLYING;
 519
 520         INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
 521         queue_work(afs_wq, &call->work);
 522         return 0;
 523 }
 524
 525 /*
 526  * allow the fileserver to ask about the cache manager's capabilities
 527  */
 528 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
 529 {
 530         struct afs_interface *ifs;
 531         struct afs_call *call = container_of(work, struct afs_call, work);
 532         int loop, nifs;
 533
 534         struct {
 535                 struct /* InterfaceAddr */ {
 536                         __be32 nifs;
 537                         __be32 uuid[11];
 538                         __be32 ifaddr[32];
 539                         __be32 netmask[32];
 540                         __be32 mtu[32];
 541                 } ia;
 542                 struct /* Capabilities */ {
 543                         __be32 capcount;
 544                         __be32 caps[1];
 545                 } cap;
 546         } reply;
 547
 548         _enter("");
 549
 550         nifs = 0;
 551         ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
 552         if (ifs) {
 553                 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
 554                 if (nifs < 0) {
 555                         kfree(ifs);
 556                         ifs = NULL;
 557                         nifs = 0;
 558                 }
 559         }
 560
 561         memset(&reply, 0, sizeof(reply));
 562         reply.ia.nifs = htonl(nifs);
 563
 564         reply.ia.uuid[0] = htonl(afs_uuid.time_low);
 565         reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
 566         reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
 567         reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
 568         reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
 569         for (loop = 0; loop < 6; loop++)
 570                 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
 571
 572         if (ifs) {
 573                 for (loop = 0; loop < nifs; loop++) {
 574                         reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
 575                         reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
 576                         reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
 577                 }
 578                 kfree(ifs);
 579         }
 580
 581         reply.cap.capcount = htonl(1);
 582         reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
 583         afs_send_simple_reply(call, &reply, sizeof(reply));
 584
 585         _leave("");
 586 }
 587
 588 /*
 589  * deliver request data to a CB.TellMeAboutYourself call
 590  */
 591 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
 592                                                  struct sk_buff *skb, bool last)
 593 {
 594         _enter(",{%u},%d", skb->len, last);
 595
 596         if (skb->len > 0)
 597                 return -EBADMSG;
 598         if (!last)
 599                 return 0;
 600
 601         /* no unmarshalling required */
 602         call->state = AFS_CALL_REPLYING;
 603
 604         INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
 605         queue_work(afs_wq, &call->work);
 606         return 0;
 607 }