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