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                 afs_extract_to_tmp(call);
 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, 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                                                   afs_eproto_cb_fid_count);
 194
 195                 call->buffer = kmalloc(array3_size(call->count, 3, 4),
 196                                        GFP_KERNEL);
 197                 if (!call->buffer)
 198                         return -ENOMEM;
 199                 afs_extract_to_buf(call, call->count * 3 * 4);
 200                 call->unmarshall++;
 201
 202         case 2:
 203                 _debug("extract FID array");
 204                 ret = afs_extract_data(call, true);
 205                 if (ret < 0)
 206                         return ret;
 207
 208                 _debug("unmarshall FID array");
 209                 call->request = kcalloc(call->count,
 210                                         sizeof(struct afs_callback_break),
 211                                         GFP_KERNEL);
 212                 if (!call->request)
 213                         return -ENOMEM;
 214
 215                 cb = call->request;
 216                 bp = call->buffer;
 217                 for (loop = call->count; loop > 0; loop--, cb++) {
 218                         cb->fid.vid     = ntohl(*bp++);
 219                         cb->fid.vnode   = ntohl(*bp++);
 220                         cb->fid.unique  = ntohl(*bp++);
 221                         cb->cb.type     = AFSCM_CB_UNTYPED;
 222                 }
 223
 224                 afs_extract_to_tmp(call);
 225                 call->unmarshall++;
 226
 227                 /* extract the callback array and its count in two steps */
 228         case 3:
 229                 _debug("extract CB count");
 230                 ret = afs_extract_data(call, true);
 231                 if (ret < 0)
 232                         return ret;
 233
 234                 call->count2 = ntohl(call->tmp);
 235                 _debug("CB count: %u", call->count2);
 236                 if (call->count2 != call->count && call->count2 != 0)
 237                         return afs_protocol_error(call, -EBADMSG,
 238                                                   afs_eproto_cb_count);
 239                 afs_extract_to_buf(call, call->count2 * 3 * 4);
 240                 call->unmarshall++;
 241
 242         case 4:
 243                 _debug("extract CB array");
 244                 ret = afs_extract_data(call, false);
 245                 if (ret < 0)
 246                         return ret;
 247
 248                 _debug("unmarshall CB array");
 249                 cb = call->request;
 250                 bp = call->buffer;
 251                 for (loop = call->count2; loop > 0; loop--, cb++) {
 252                         cb->cb.version  = ntohl(*bp++);
 253                         cb->cb.expiry   = ntohl(*bp++);
 254                         cb->cb.type     = ntohl(*bp++);
 255                 }
 256
 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         afs_extract_discard(call, 0);
 304         ret = afs_extract_data(call, false);
 305         if (ret < 0)
 306                 return ret;
 307
 308         /* we'll need the file server record as that tells us which set of
 309          * vnodes to operate upon */
 310         call->cm_server = afs_find_server(call->net, &srx);
 311         if (!call->cm_server)
 312                 trace_afs_cm_no_server(call, &srx);
 313
 314         return afs_queue_call_work(call);
 315 }
 316
 317 /*
 318  * deliver request data to a CB.InitCallBackState3 call
 319  */
 320 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
 321 {
 322         struct afs_uuid *r;
 323         unsigned loop;
 324         __be32 *b;
 325         int ret;
 326
 327         _enter("");
 328
 329         _enter("{%u}", call->unmarshall);
 330
 331         switch (call->unmarshall) {
 332         case 0:
 333                 call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
 334                 if (!call->buffer)
 335                         return -ENOMEM;
 336                 afs_extract_to_buf(call, 11 * sizeof(__be32));
 337                 call->unmarshall++;
 338
 339         case 1:
 340                 _debug("extract UUID");
 341                 ret = afs_extract_data(call, 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->unmarshall++;
 365
 366         case 2:
 367                 break;
 368         }
 369
 370         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 371                 return -EIO;
 372
 373         /* we'll need the file server record as that tells us which set of
 374          * vnodes to operate upon */
 375         rcu_read_lock();
 376         call->cm_server = afs_find_server_by_uuid(call->net, call->request);
 377         rcu_read_unlock();
 378         if (!call->cm_server)
 379                 trace_afs_cm_no_server_u(call, call->request);
 380
 381         return afs_queue_call_work(call);
 382 }
 383
 384 /*
 385  * allow the fileserver to see if the cache manager is still alive
 386  */
 387 static void SRXAFSCB_Probe(struct work_struct *work)
 388 {
 389         struct afs_call *call = container_of(work, struct afs_call, work);
 390
 391         _enter("");
 392         afs_send_empty_reply(call);
 393         afs_put_call(call);
 394         _leave("");
 395 }
 396
 397 /*
 398  * deliver request data to a CB.Probe call
 399  */
 400 static int afs_deliver_cb_probe(struct afs_call *call)
 401 {
 402         int ret;
 403
 404         _enter("");
 405
 406         afs_extract_discard(call, 0);
 407         ret = afs_extract_data(call, 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->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
 456                 if (!call->buffer)
 457                         return -ENOMEM;
 458                 afs_extract_to_buf(call, 11 * sizeof(__be32));
 459                 call->unmarshall++;
 460
 461         case 1:
 462                 _debug("extract UUID");
 463                 ret = afs_extract_data(call, false);
 464                 switch (ret) {
 465                 case 0:         break;
 466                 case -EAGAIN:   return 0;
 467                 default:        return ret;
 468                 }
 469
 470                 _debug("unmarshall UUID");
 471                 call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
 472                 if (!call->request)
 473                         return -ENOMEM;
 474
 475                 b = call->buffer;
 476                 r = call->request;
 477                 r->time_low                     = b[0];
 478                 r->time_mid                     = htons(ntohl(b[1]));
 479                 r->time_hi_and_version          = htons(ntohl(b[2]));
 480                 r->clock_seq_hi_and_reserved    = ntohl(b[3]);
 481                 r->clock_seq_low                = ntohl(b[4]);
 482
 483                 for (loop = 0; loop < 6; loop++)
 484                         r->node[loop] = ntohl(b[loop + 5]);
 485
 486                 call->unmarshall++;
 487
 488         case 2:
 489                 break;
 490         }
 491
 492         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 493                 return -EIO;
 494
 495         return afs_queue_call_work(call);
 496 }
 497
 498 /*
 499  * allow the fileserver to ask about the cache manager's capabilities
 500  */
 501 static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
 502 {
 503         struct afs_interface *ifs;
 504         struct afs_call *call = container_of(work, struct afs_call, work);
 505         int loop, nifs;
 506
 507         struct {
 508                 struct /* InterfaceAddr */ {
 509                         __be32 nifs;
 510                         __be32 uuid[11];
 511                         __be32 ifaddr[32];
 512                         __be32 netmask[32];
 513                         __be32 mtu[32];
 514                 } ia;
 515                 struct /* Capabilities */ {
 516                         __be32 capcount;
 517                         __be32 caps[1];
 518                 } cap;
 519         } reply;
 520
 521         _enter("");
 522
 523         nifs = 0;
 524         ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
 525         if (ifs) {
 526                 nifs = afs_get_ipv4_interfaces(call->net, ifs, 32, false);
 527                 if (nifs < 0) {
 528                         kfree(ifs);
 529                         ifs = NULL;
 530                         nifs = 0;
 531                 }
 532         }
 533
 534         memset(&reply, 0, sizeof(reply));
 535         reply.ia.nifs = htonl(nifs);
 536
 537         reply.ia.uuid[0] = call->net->uuid.time_low;
 538         reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
 539         reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
 540         reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
 541         reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
 542         for (loop = 0; loop < 6; loop++)
 543                 reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
 544
 545         if (ifs) {
 546                 for (loop = 0; loop < nifs; loop++) {
 547                         reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
 548                         reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
 549                         reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
 550                 }
 551                 kfree(ifs);
 552         }
 553
 554         reply.cap.capcount = htonl(1);
 555         reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
 556         afs_send_simple_reply(call, &reply, sizeof(reply));
 557         afs_put_call(call);
 558         _leave("");
 559 }
 560
 561 /*
 562  * deliver request data to a CB.TellMeAboutYourself call
 563  */
 564 static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
 565 {
 566         int ret;
 567
 568         _enter("");
 569
 570         afs_extract_discard(call, 0);
 571         ret = afs_extract_data(call, false);
 572         if (ret < 0)
 573                 return ret;
 574
 575         if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
 576                 return -EIO;
 577
 578         return afs_queue_call_work(call);
 579 }