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 static int afs_deliver_cb_init_call_back_state(struct afs_call *);
  21 static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
  22 static int afs_deliver_cb_probe(struct afs_call *);
  23 static int afs_deliver_cb_callback(struct afs_call *);
  24 static int afs_deliver_cb_probe_uuid(struct afs_call *);
  25 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
  26 static void afs_cm_destructor(struct afs_call *);
  27 static void SRXAFSCB_CallBack(struct work_struct *);
  28 static void SRXAFSCB_InitCallBackState(struct work_struct *);
  29 static void SRXAFSCB_Probe(struct work_struct *);
  30 static void SRXAFSCB_ProbeUuid(struct work_struct *);
  31 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
  32
  33 #define CM_NAME(name) \
  34         const char afs_SRXCB##name##_name[] __tracepoint_string =       \
  35                 "CB." #name
  36
  37 /*
  38  * CB.CallBack operation type
  39  */
  40 static CM_NAME(CallBack);
  41 static const struct afs_call_type afs_SRXCBCallBack = {
  42         .name           = afs_SRXCBCallBack_name,
  43         .deliver        = afs_deliver_cb_callback,
  44         .destructor     = afs_cm_destructor,
  45         .work           = SRXAFSCB_CallBack,
  46 };
  47
  48 /*
  49  * CB.InitCallBackState operation type
  50  */
  51 static CM_NAME(InitCallBackState);
  52 static const struct afs_call_type afs_SRXCBInitCallBackState = {
  53         .name           = afs_SRXCBInitCallBackState_name,
  54         .deliver        = afs_deliver_cb_init_call_back_state,
  55         .destructor     = afs_cm_destructor,
  56         .work           = SRXAFSCB_InitCallBackState,
  57 };
  58
  59 /*
  60  * CB.InitCallBackState3 operation type
  61  */
  62 static CM_NAME(InitCallBackState3);
  63 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
  64         .name           = afs_SRXCBInitCallBackState3_name,
  65         .deliver        = afs_deliver_cb_init_call_back_state3,
  66         .destructor     = afs_cm_destructor,
  67         .work           = SRXAFSCB_InitCallBackState,
  68 };
  69
  70 /*
  71  * CB.Probe operation type
  72  */
  73 static CM_NAME(Probe);
  74 static const struct afs_call_type afs_SRXCBProbe = {
  75         .name           = afs_SRXCBProbe_name,
  76         .deliver        = afs_deliver_cb_probe,
  77         .destructor     = afs_cm_destructor,
  78         .work           = SRXAFSCB_Probe,
  79 };
  80
  81 /*
  82  * CB.ProbeUuid operation type
  83  */
  84 static CM_NAME(ProbeUuid);
  85 static const struct afs_call_type afs_SRXCBProbeUuid = {
  86         .name           = afs_SRXCBProbeUuid_name,
  87         .deliver        = afs_deliver_cb_probe_uuid,
  88         .destructor     = afs_cm_destructor,
  89         .work           = SRXAFSCB_ProbeUuid,
  90 };
  91
  92 /*
  93  * CB.TellMeAboutYourself operation type
  94  */
  95 static CM_NAME(TellMeAboutYourself);
  96 static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
  97         .name           = afs_SRXCBTellMeAboutYourself_name,
  98         .deliver        = afs_deliver_cb_tell_me_about_yourself,
  99         .destructor     = afs_cm_destructor,
 100         .work           = SRXAFSCB_TellMeAboutYourself,
 101 };
 102
 103 /*
 104  * route an incoming cache manager call
 105  * - return T if supported, F if not
 106  */
 107 bool afs_cm_incoming_call(struct afs_call *call)
 108 {
 109         _enter("{CB.OP %u}", call->operation_ID);
 110
 111         switch (call->operation_ID) {
 112         case CBCallBack:
 113                 call->type = &afs_SRXCBCallBack;
 114                 return true;
 115         case CBInitCallBackState:
 116                 call->type = &afs_SRXCBInitCallBackState;
 117                 return true;
 118         case CBInitCallBackState3:
 119                 call->type = &afs_SRXCBInitCallBackState3;
 120                 return true;
 121         case CBProbe:
 122                 call->type = &afs_SRXCBProbe;
 123                 return true;
 124         case CBProbeUuid:
 125                 call->type = &afs_SRXCBProbeUuid;
 126                 return true;
 127         case CBTellMeAboutYourself:
 128                 call->type = &afs_SRXCBTellMeAboutYourself;
 129                 return true;
 130         default:
 131                 return false;
 132         }
 133 }
 134
 135 /*
 136  * Clean up a cache manager call.
 137  */
 138 static void afs_cm_destructor(struct afs_call *call)
 139 {
 140         kfree(call->buffer);
 141         call->buffer = NULL;
 142 }
 143
 144 /*
 145  * The server supplied a list of callbacks that it wanted to break.
 146  */
 147 static void SRXAFSCB_CallBack(struct work_struct *work)
 148 {
 149         struct afs_call *call = container_of(work, struct afs_call, work);
 150
 151         _enter("");
 152
 153         /* We need to break the callbacks before sending the reply as the
 154          * server holds up change visibility till it receives our reply so as
 155          * to maintain cache coherency.
 156          */
 157         if (call->cm_server)
 158                 afs_break_callbacks(call->cm_server, call->count, call->request);
 159
 160         afs_send_empty_reply(call);
 161         afs_put_call(call);
 162         _leave("");
 163 }
 164
 165 /*
 166  * deliver request data to a CB.CallBack call
 167  */
 168 static int afs_deliver_cb_callback(struct afs_call *call)
 169 {
 170         struct afs_callback_break *cb;
 171         struct sockaddr_rxrpc srx;
 172         __be32 *bp;
 173         int ret, loop;
 174
 175         _enter("{%u}", call->unmarshall);
 176
 177         switch (call->unmarshall) {
 178         case 0:
 179                 call->offset = 0;
 180                 call->unmarshall++;
 181
 182                 /* extract the FID array and its count in two steps */
 183         case 1:
 184                 _debug("extract FID count");
 185                 ret = afs_extract_data(call, &call->tmp, 4, true);
 186                 if (ret < 0)
 187                         return ret;
 188
 189                 call->count = ntohl(call->tmp);
 190                 _debug("FID count: %u", call->count);
 191                 if (call->count > AFSCBMAX)
 192                         return afs_protocol_error(call, -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, call->buffer,
 203                                        call->count * 3 * 4, true);
 204                 if (ret < 0)
 205                         return ret;
 206
 207                 _debug("unmarshall FID array");
 208                 call->request = kcalloc(call->count,
 209                                         sizeof(struct afs_callback_break),
 210                                         GFP_KERNEL);
 211                 if (!call->request)
 212                         return -ENOMEM;
 213
 214                 cb = call->request;
 215                 bp = call->buffer;
 216                 for (loop = call->count; loop > 0; loop--, cb++) {
 217                         cb->fid.vid     = ntohl(*bp++);
 218                         cb->fid.vnode   = ntohl(*bp++);
 219                         cb->fid.unique  = ntohl(*bp++);
 220                         cb->cb.type     = AFSCM_CB_UNTYPED;
 221                 }
 222
 223                 call->offset = 0;
 224                 call->unmarshall++;
 225
 226                 /* extract the callback array and its count in two steps */
 227         case 3:
 228                 _debug("extract CB count");
 229                 ret = afs_extract_data(call, &call->tmp, 4, true);
 230                 if (ret < 0)
 231                         return ret;
 232
 233                 call->count2 = ntohl(call->tmp);
 234                 _debug("CB count: %u", call->count2);
 235                 if (call->count2 != call->count && call->count2 != 0)
 236                         return afs_protocol_error(call, -EBADMSG);
 237                 call->offset = 0;
 238                 call->unmarshall++;
 239
 240         case 4:
 241                 _debug("extract CB array");
 242                 ret = afs_extract_data(call, call->buffer,
 243                                        call->count2 * 3 * 4, false);
 244                 if (ret < 0)
 245                         return ret;
 246
 247                 _debug("unmarshall CB array");
 248                 cb = call->request;
 249                 bp = call->buffer;
 250                 for (loop = call->count2; loop > 0; loop--, cb++) {
 251                         cb->cb.version  = ntohl(*bp++);
 252                         cb->cb.expiry   = ntohl(*bp++);
 253                         cb->cb.type     = ntohl(*bp++);
 254                 }
 255
 256                 call->offset = 0;
 257                 call->unmarshall++;
 258         case 5:
 259                 break;
 260         }
 261
 262         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 263                 return -EIO;
 264
 265         /* we'll need the file server record as that tells us which set of
 266          * vnodes to operate upon */
 267         rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
 268         call->cm_server = afs_find_server(call->net, &srx);
 269         if (!call->cm_server)
 270                 trace_afs_cm_no_server(call, &srx);
 271
 272         return afs_queue_call_work(call);
 273 }
 274
 275 /*
 276  * allow the fileserver to request callback state (re-)initialisation
 277  */
 278 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
 279 {
 280         struct afs_call *call = container_of(work, struct afs_call, work);
 281
 282         _enter("{%p}", call->cm_server);
 283
 284         if (call->cm_server)
 285                 afs_init_callback_state(call->cm_server);
 286         afs_send_empty_reply(call);
 287         afs_put_call(call);
 288         _leave("");
 289 }
 290
 291 /*
 292  * deliver request data to a CB.InitCallBackState call
 293  */
 294 static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
 295 {
 296         struct sockaddr_rxrpc srx;
 297         int ret;
 298
 299         _enter("");
 300
 301         rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
 302
 303         ret = afs_extract_data(call, NULL, 0, false);
 304         if (ret < 0)
 305                 return ret;
 306
 307         /* we'll need the file server record as that tells us which set of
 308          * vnodes to operate upon */
 309         call->cm_server = afs_find_server(call->net, &srx);
 310         if (!call->cm_server)
 311                 trace_afs_cm_no_server(call, &srx);
 312
 313         return afs_queue_call_work(call);
 314 }
 315
 316 /*
 317  * deliver request data to a CB.InitCallBackState3 call
 318  */
 319 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
 320 {
 321         struct afs_uuid *r;
 322         unsigned loop;
 323         __be32 *b;
 324         int ret;
 325
 326         _enter("");
 327
 328         _enter("{%u}", call->unmarshall);
 329
 330         switch (call->unmarshall) {
 331         case 0:
 332                 call->offset = 0;
 333                 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
 334                 if (!call->buffer)
 335                         return -ENOMEM;
 336                 call->unmarshall++;
 337
 338         case 1:
 339                 _debug("extract UUID");
 340                 ret = afs_extract_data(call, call->buffer,
 341                                        11 * sizeof(__be32), false);
 342                 switch (ret) {
 343                 case 0:         break;
 344                 case -EAGAIN:   return 0;
 345                 default:        return ret;
 346                 }
 347
 348                 _debug("unmarshall UUID");
 349                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
 350                 if (!call->request)
 351                         return -ENOMEM;
 352
 353                 b = call->buffer;
 354                 r = call->request;
 355                 r->time_low                     = b[0];
 356                 r->time_mid                     = htons(ntohl(b[1]));
 357                 r->time_hi_and_version          = htons(ntohl(b[2]));
 358                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
 359                 r->clock_seq_low                = ntohl(b[4]);
 360
 361                 for (loop = 0; loop < 6; loop++)
 362                         r->node[loop] = ntohl(b[loop + 5]);
 363
 364                 call->offset = 0;
 365                 call->unmarshall++;
 366
 367         case 2:
 368                 break;
 369         }
 370
 371         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 372                 return -EIO;
 373
 374         /* we'll need the file server record as that tells us which set of
 375          * vnodes to operate upon */
 376         rcu_read_lock();
 377         call->cm_server = afs_find_server_by_uuid(call->net, call->request);
 378         rcu_read_unlock();
 379         if (!call->cm_server)
 380                 trace_afs_cm_no_server_u(call, call->request);
 381
 382         return afs_queue_call_work(call);
 383 }
 384
 385 /*
 386  * allow the fileserver to see if the cache manager is still alive
 387  */
 388 static void SRXAFSCB_Probe(struct work_struct *work)
 389 {
 390         struct afs_call *call = container_of(work, struct afs_call, work);
 391
 392         _enter("");
 393         afs_send_empty_reply(call);
 394         afs_put_call(call);
 395         _leave("");
 396 }
 397
 398 /*
 399  * deliver request data to a CB.Probe call
 400  */
 401 static int afs_deliver_cb_probe(struct afs_call *call)
 402 {
 403         int ret;
 404
 405         _enter("");
 406
 407         ret = afs_extract_data(call, NULL, 0, false);
 408         if (ret < 0)
 409                 return ret;
 410
 411         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 412                 return -EIO;
 413
 414         return afs_queue_call_work(call);
 415 }
 416
 417 /*
 418  * allow the fileserver to quickly find out if the fileserver has been rebooted
 419  */
 420 static void SRXAFSCB_ProbeUuid(struct work_struct *work)
 421 {
 422         struct afs_call *call = container_of(work, struct afs_call, work);
 423         struct afs_uuid *r = call->request;
 424
 425         struct {
 426                 __be32  match;
 427         } reply;
 428
 429         _enter("");
 430
 431         if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
 432                 reply.match = htonl(0);
 433         else
 434                 reply.match = htonl(1);
 435
 436         afs_send_simple_reply(call, &reply, sizeof(reply));
 437         afs_put_call(call);
 438         _leave("");
 439 }
 440
 441 /*
 442  * deliver request data to a CB.ProbeUuid call
 443  */
 444 static int afs_deliver_cb_probe_uuid(struct afs_call *call)
 445 {
 446         struct afs_uuid *r;
 447         unsigned loop;
 448         __be32 *b;
 449         int ret;
 450
 451         _enter("{%u}", call->unmarshall);
 452
 453         switch (call->unmarshall) {
 454         case 0:
 455                 call->offset = 0;
 456                 call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
 457                 if (!call->buffer)
 458                         return -ENOMEM;
 459                 call->unmarshall++;
 460
 461         case 1:
 462                 _debug("extract UUID");
 463                 ret = afs_extract_data(call, call->buffer,
 464                                        11 * sizeof(__be32), false);
 465                 switch (ret) {
 466                 case 0:         break;
 467                 case -EAGAIN:   return 0;
 468                 default:        return ret;
 469                 }
 470
 471                 _debug("unmarshall UUID");
 472                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
 473                 if (!call->request)
 474                         return -ENOMEM;
 475
 476                 b = call->buffer;
 477                 r = call->request;
 478                 r->time_low                     = b[0];
 479                 r->time_mid                     = htons(ntohl(b[1]));
 480                 r->time_hi_and_version          = htons(ntohl(b[2]));
 481                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
 482                 r->clock_seq_low                = ntohl(b[4]);
 483
 484                 for (loop = 0; loop < 6; loop++)
 485                         r->node[loop] = ntohl(b[loop + 5]);
 486
 487                 call->offset = 0;
 488                 call->unmarshall++;
 489
 490         case 2:
 491                 break;
 492         }
 493
 494         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 495                 return -EIO;
 496
 497         return afs_queue_call_work(call);
 498 }
 499
 500 /*
 501  * allow the fileserver to ask about the cache manager's capabilities
 502  */
 503 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
 504 {
 505         struct afs_interface *ifs;
 506         struct afs_call *call = container_of(work, struct afs_call, work);
 507         int loop, nifs;
 508
 509         struct {
 510                 struct /* InterfaceAddr */ {
 511                         __be32 nifs;
 512                         __be32 uuid[11];
 513                         __be32 ifaddr[32];
 514                         __be32 netmask[32];
 515                         __be32 mtu[32];
 516                 } ia;
 517                 struct /* Capabilities */ {
 518                         __be32 capcount;
 519                         __be32 caps[1];
 520                 } cap;
 521         } reply;
 522
 523         _enter("");
 524
 525         nifs = 0;
 526         ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
 527         if (ifs) {
 528                 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
 529                 if (nifs < 0) {
 530                         kfree(ifs);
 531                         ifs = NULL;
 532                         nifs = 0;
 533                 }
 534         }
 535
 536         memset(&reply, 0, sizeof(reply));
 537         reply.ia.nifs = htonl(nifs);
 538
 539         reply.ia.uuid[0] = call->net->uuid.time_low;
 540         reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
 541         reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
 542         reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
 543         reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
 544         for (loop = 0; loop < 6; loop++)
 545                 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
 546
 547         if (ifs) {
 548                 for (loop = 0; loop < nifs; loop++) {
 549                         reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
 550                         reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
 551                         reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
 552                 }
 553                 kfree(ifs);
 554         }
 555
 556         reply.cap.capcount = htonl(1);
 557         reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
 558         afs_send_simple_reply(call, &reply, sizeof(reply));
 559         afs_put_call(call);
 560         _leave("");
 561 }
 562
 563 /*
 564  * deliver request data to a CB.TellMeAboutYourself call
 565  */
 566 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
 567 {
 568         int ret;
 569
 570         _enter("");
 571
 572         ret = afs_extract_data(call, NULL, 0, false);
 573         if (ret < 0)
 574                 return ret;
 575
 576         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 577                 return -EIO;
 578
 579         return afs_queue_call_work(call);
 580 }