release/src-rt-6.x/linux/linux-2.6/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/sched.h>
  15 #include <linux/ip.h>
  16 #include "internal.h"
  17 #include "afs_cm.h"
  18
  19 struct workqueue_struct *afs_cm_workqueue;
  20
  21 static int afs_deliver_cb_init_call_back_state(struct afs_call *,
  22                                                struct sk_buff *, bool);
  23 static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
  24                                                 struct sk_buff *, bool);
  25 static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
  26 static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
  27 static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *,
  28                                            bool);
  29 static void afs_cm_destructor(struct afs_call *);
  30
  31 /*
  32  * CB.CallBack operation type
  33  */
  34 static const struct afs_call_type afs_SRXCBCallBack = {
  35         .name           = "CB.CallBack",
  36         .deliver        = afs_deliver_cb_callback,
  37         .abort_to_error = afs_abort_to_error,
  38         .destructor     = afs_cm_destructor,
  39 };
  40
  41 /*
  42  * CB.InitCallBackState operation type
  43  */
  44 static const struct afs_call_type afs_SRXCBInitCallBackState = {
  45         .name           = "CB.InitCallBackState",
  46         .deliver        = afs_deliver_cb_init_call_back_state,
  47         .abort_to_error = afs_abort_to_error,
  48         .destructor     = afs_cm_destructor,
  49 };
  50
  51 /*
  52  * CB.InitCallBackState3 operation type
  53  */
  54 static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
  55         .name           = "CB.InitCallBackState3",
  56         .deliver        = afs_deliver_cb_init_call_back_state3,
  57         .abort_to_error = afs_abort_to_error,
  58         .destructor     = afs_cm_destructor,
  59 };
  60
  61 /*
  62  * CB.Probe operation type
  63  */
  64 static const struct afs_call_type afs_SRXCBProbe = {
  65         .name           = "CB.Probe",
  66         .deliver        = afs_deliver_cb_probe,
  67         .abort_to_error = afs_abort_to_error,
  68         .destructor     = afs_cm_destructor,
  69 };
  70
  71 /*
  72  * CB.GetCapabilities operation type
  73  */
  74 static const struct afs_call_type afs_SRXCBGetCapabilites = {
  75         .name           = "CB.GetCapabilities",
  76         .deliver        = afs_deliver_cb_get_capabilities,
  77         .abort_to_error = afs_abort_to_error,
  78         .destructor     = afs_cm_destructor,
  79 };
  80
  81 /*
  82  * route an incoming cache manager call
  83  * - return T if supported, F if not
  84  */
  85 bool afs_cm_incoming_call(struct afs_call *call)
  86 {
  87         u32 operation_id = ntohl(call->operation_ID);
  88
  89         _enter("{CB.OP %u}", operation_id);
  90
  91         switch (operation_id) {
  92         case CBCallBack:
  93                 call->type = &afs_SRXCBCallBack;
  94                 return true;
  95         case CBInitCallBackState:
  96                 call->type = &afs_SRXCBInitCallBackState;
  97                 return true;
  98         case CBInitCallBackState3:
  99                 call->type = &afs_SRXCBInitCallBackState3;
 100                 return true;
 101         case CBProbe:
 102                 call->type = &afs_SRXCBProbe;
 103                 return true;
 104         case CBGetCapabilities:
 105                 call->type = &afs_SRXCBGetCapabilites;
 106                 return true;
 107         default:
 108                 return false;
 109         }
 110 }
 111
 112 /*
 113  * clean up a cache manager call
 114  */
 115 static void afs_cm_destructor(struct afs_call *call)
 116 {
 117         _enter("");
 118
 119         afs_put_server(call->server);
 120         call->server = NULL;
 121         kfree(call->buffer);
 122         call->buffer = NULL;
 123 }
 124
 125 /*
 126  * allow the fileserver to see if the cache manager is still alive
 127  */
 128 static void SRXAFSCB_CallBack(struct work_struct *work)
 129 {
 130         struct afs_call *call = container_of(work, struct afs_call, work);
 131
 132         _enter("");
 133
 134         /* be sure to send the reply *before* attempting to spam the AFS server
 135          * with FSFetchStatus requests on the vnodes with broken callbacks lest
 136          * the AFS server get into a vicious cycle of trying to break further
 137          * callbacks because it hadn't received completion of the CBCallBack op
 138          * yet */
 139         afs_send_empty_reply(call);
 140
 141         afs_break_callbacks(call->server, call->count, call->request);
 142         _leave("");
 143 }
 144
 145 /*
 146  * deliver request data to a CB.CallBack call
 147  */
 148 static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
 149                                    bool last)
 150 {
 151         struct afs_callback *cb;
 152         struct afs_server *server;
 153         struct in_addr addr;
 154         __be32 *bp;
 155         u32 tmp;
 156         int ret, loop;
 157
 158         _enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
 159
 160         switch (call->unmarshall) {
 161         case 0:
 162                 call->offset = 0;
 163                 call->unmarshall++;
 164
 165                 /* extract the FID array and its count in two steps */
 166         case 1:
 167                 _debug("extract FID count");
 168                 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
 169                 switch (ret) {
 170                 case 0:         break;
 171                 case -EAGAIN:   return 0;
 172                 default:        return ret;
 173                 }
 174
 175                 call->count = ntohl(call->tmp);
 176                 _debug("FID count: %u", call->count);
 177                 if (call->count > AFSCBMAX)
 178                         return -EBADMSG;
 179
 180                 call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
 181                 if (!call->buffer)
 182                         return -ENOMEM;
 183                 call->offset = 0;
 184                 call->unmarshall++;
 185
 186         case 2:
 187                 _debug("extract FID array");
 188                 ret = afs_extract_data(call, skb, last, call->buffer,
 189                                        call->count * 3 * 4);
 190                 switch (ret) {
 191                 case 0:         break;
 192                 case -EAGAIN:   return 0;
 193                 default:        return ret;
 194                 }
 195
 196                 _debug("unmarshall FID array");
 197                 call->request = kcalloc(call->count,
 198                                         sizeof(struct afs_callback),
 199                                         GFP_KERNEL);
 200                 if (!call->request)
 201                         return -ENOMEM;
 202
 203                 cb = call->request;
 204                 bp = call->buffer;
 205                 for (loop = call->count; loop > 0; loop--, cb++) {
 206                         cb->fid.vid     = ntohl(*bp++);
 207                         cb->fid.vnode   = ntohl(*bp++);
 208                         cb->fid.unique  = ntohl(*bp++);
 209                         cb->type        = AFSCM_CB_UNTYPED;
 210                 }
 211
 212                 call->offset = 0;
 213                 call->unmarshall++;
 214
 215                 /* extract the callback array and its count in two steps */
 216         case 3:
 217                 _debug("extract CB count");
 218                 ret = afs_extract_data(call, skb, last, &call->tmp, 4);
 219                 switch (ret) {
 220                 case 0:         break;
 221                 case -EAGAIN:   return 0;
 222                 default:        return ret;
 223                 }
 224
 225                 tmp = ntohl(call->tmp);
 226                 _debug("CB count: %u", tmp);
 227                 if (tmp != call->count && tmp != 0)
 228                         return -EBADMSG;
 229                 call->offset = 0;
 230                 call->unmarshall++;
 231                 if (tmp == 0)
 232                         goto empty_cb_array;
 233
 234         case 4:
 235                 _debug("extract CB array");
 236                 ret = afs_extract_data(call, skb, last, call->request,
 237                                        call->count * 3 * 4);
 238                 switch (ret) {
 239                 case 0:         break;
 240                 case -EAGAIN:   return 0;
 241                 default:        return ret;
 242                 }
 243
 244                 _debug("unmarshall CB array");
 245                 cb = call->request;
 246                 bp = call->buffer;
 247                 for (loop = call->count; loop > 0; loop--, cb++) {
 248                         cb->version     = ntohl(*bp++);
 249                         cb->expiry      = ntohl(*bp++);
 250                         cb->type        = ntohl(*bp++);
 251                 }
 252
 253         empty_cb_array:
 254                 call->offset = 0;
 255                 call->unmarshall++;
 256
 257         case 5:
 258                 _debug("trailer");
 259                 if (skb->len != 0)
 260                         return -EBADMSG;
 261                 break;
 262         }
 263
 264         if (!last)
 265                 return 0;
 266
 267         call->state = AFS_CALL_REPLYING;
 268
 269         /* we'll need the file server record as that tells us which set of
 270          * vnodes to operate upon */
 271         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 272         server = afs_find_server(&addr);
 273         if (!server)
 274                 return -ENOTCONN;
 275         call->server = server;
 276
 277         INIT_WORK(&call->work, SRXAFSCB_CallBack);
 278         schedule_work(&call->work);
 279         return 0;
 280 }
 281
 282 /*
 283  * allow the fileserver to request callback state (re-)initialisation
 284  */
 285 static void SRXAFSCB_InitCallBackState(struct work_struct *work)
 286 {
 287         struct afs_call *call = container_of(work, struct afs_call, work);
 288
 289         _enter("{%p}", call->server);
 290
 291         afs_init_callback_state(call->server);
 292         afs_send_empty_reply(call);
 293         _leave("");
 294 }
 295
 296 /*
 297  * deliver request data to a CB.InitCallBackState call
 298  */
 299 static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
 300                                                struct sk_buff *skb,
 301                                                bool last)
 302 {
 303         struct afs_server *server;
 304         struct in_addr addr;
 305
 306         _enter(",{%u},%d", skb->len, last);
 307
 308         if (skb->len > 0)
 309                 return -EBADMSG;
 310         if (!last)
 311                 return 0;
 312
 313         /* no unmarshalling required */
 314         call->state = AFS_CALL_REPLYING;
 315
 316         /* we'll need the file server record as that tells us which set of
 317          * vnodes to operate upon */
 318         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 319         server = afs_find_server(&addr);
 320         if (!server)
 321                 return -ENOTCONN;
 322         call->server = server;
 323
 324         INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
 325         schedule_work(&call->work);
 326         return 0;
 327 }
 328
 329 /*
 330  * deliver request data to a CB.InitCallBackState3 call
 331  */
 332 static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
 333                                                 struct sk_buff *skb,
 334                                                 bool last)
 335 {
 336         struct afs_server *server;
 337         struct in_addr addr;
 338
 339         _enter(",{%u},%d", skb->len, last);
 340
 341         if (!last)
 342                 return 0;
 343
 344         /* no unmarshalling required */
 345         call->state = AFS_CALL_REPLYING;
 346
 347         /* we'll need the file server record as that tells us which set of
 348          * vnodes to operate upon */
 349         memcpy(&addr, &ip_hdr(skb)->saddr, 4);
 350         server = afs_find_server(&addr);
 351         if (!server)
 352                 return -ENOTCONN;
 353         call->server = server;
 354
 355         INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
 356         schedule_work(&call->work);
 357         return 0;
 358 }
 359
 360 /*
 361  * allow the fileserver to see if the cache manager is still alive
 362  */
 363 static void SRXAFSCB_Probe(struct work_struct *work)
 364 {
 365         struct afs_call *call = container_of(work, struct afs_call, work);
 366
 367         _enter("");
 368         afs_send_empty_reply(call);
 369         _leave("");
 370 }
 371
 372 /*
 373  * deliver request data to a CB.Probe call
 374  */
 375 static int afs_deliver_cb_probe(struct afs_call *call, struct sk_buff *skb,
 376                                 bool last)
 377 {
 378         _enter(",{%u},%d", skb->len, last);
 379
 380         if (skb->len > 0)
 381                 return -EBADMSG;
 382         if (!last)
 383                 return 0;
 384
 385         /* no unmarshalling required */
 386         call->state = AFS_CALL_REPLYING;
 387
 388         INIT_WORK(&call->work, SRXAFSCB_Probe);
 389         schedule_work(&call->work);
 390         return 0;
 391 }
 392
 393 /*
 394  * allow the fileserver to ask about the cache manager's capabilities
 395  */
 396 static void SRXAFSCB_GetCapabilities(struct work_struct *work)
 397 {
 398         struct afs_interface *ifs;
 399         struct afs_call *call = container_of(work, struct afs_call, work);
 400         int loop, nifs;
 401
 402         struct {
 403                 struct /* InterfaceAddr */ {
 404                         __be32 nifs;
 405                         __be32 uuid[11];
 406                         __be32 ifaddr[32];
 407                         __be32 netmask[32];
 408                         __be32 mtu[32];
 409                 } ia;
 410                 struct /* Capabilities */ {
 411                         __be32 capcount;
 412                         __be32 caps[1];
 413                 } cap;
 414         } reply;
 415
 416         _enter("");
 417
 418         nifs = 0;
 419         ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
 420         if (ifs) {
 421                 nifs = afs_get_ipv4_interfaces(ifs, 32, false);
 422                 if (nifs < 0) {
 423                         kfree(ifs);
 424                         ifs = NULL;
 425                         nifs = 0;
 426                 }
 427         }
 428
 429         memset(&reply, 0, sizeof(reply));
 430         reply.ia.nifs = htonl(nifs);
 431
 432         reply.ia.uuid[0] = htonl(afs_uuid.time_low);
 433         reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
 434         reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
 435         reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
 436         reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
 437         for (loop = 0; loop < 6; loop++)
 438                 reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
 439
 440         if (ifs) {
 441                 for (loop = 0; loop < nifs; loop++) {
 442                         reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
 443                         reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
 444                         reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
 445                 }
 446                 kfree(ifs);
 447         }
 448
 449         reply.cap.capcount = htonl(1);
 450         reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
 451         afs_send_simple_reply(call, &reply, sizeof(reply));
 452
 453         _leave("");
 454 }
 455
 456 /*
 457  * deliver request data to a CB.GetCapabilities call
 458  */
 459 static int afs_deliver_cb_get_capabilities(struct afs_call *call,
 460                                            struct sk_buff *skb, bool last)
 461 {
 462         _enter(",{%u},%d", skb->len, last);
 463
 464         if (skb->len > 0)
 465                 return -EBADMSG;
 466         if (!last)
 467                 return 0;
 468
 469         /* no unmarshalling required */
 470         call->state = AFS_CALL_REPLYING;
 471
 472         INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
 473         schedule_work(&call->work);
 474         return 0;
 475 }