lustre/obdclass/genops.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdclass/genops.c
  37  *
  38  * These are the only exported functions, they provide some generic
  39  * infrastructure for managing object devices
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_CLASS
  43 #ifndef __KERNEL__
  44 #include <liblustre.h>
  45 #endif
  46 #include <obd_ost.h>
  47 #include <obd_class.h>
  48 #include <lprocfs_status.h>
  49 #include <class_hash.h>
  50
  51 extern struct list_head obd_types;
  52 spinlock_t obd_types_lock;
  53
  54 cfs_mem_cache_t *obd_device_cachep;
  55 cfs_mem_cache_t *obdo_cachep;
  56 EXPORT_SYMBOL(obdo_cachep);
  57 cfs_mem_cache_t *import_cachep;
  58
  59 struct list_head  obd_zombie_imports;
  60 struct list_head  obd_zombie_exports;
  61 spinlock_t        obd_zombie_impexp_lock;
  62 static void obd_zombie_impexp_notify(void);
  63 static void obd_zombie_export_add(struct obd_export *exp);
  64 static void obd_zombie_import_add(struct obd_import *imp);
  65 static void print_export_data(struct obd_export *exp, const char *status);
  66
  67 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
  68
  69 /*
  70  * support functions: we could use inter-module communication, but this
  71  * is more portable to other OS's
  72  */
  73 static struct obd_device *obd_device_alloc(void)
  74 {
  75         struct obd_device *obd;
  76
  77         OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, CFS_ALLOC_IO);
  78         if (obd != NULL) {
  79                 obd->obd_magic = OBD_DEVICE_MAGIC;
  80         }
  81         return obd;
  82 }
  83 EXPORT_SYMBOL(obd_device_alloc);
  84
  85 static void obd_device_free(struct obd_device *obd)
  86 {
  87         LASSERT(obd != NULL);
  88         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
  89                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
  90         if (obd->obd_namespace != NULL) {
  91                 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
  92                        obd, obd->obd_namespace, obd->obd_force);
  93                 LBUG();
  94         }
  95         lu_ref_fini(&obd->obd_reference);
  96         OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
  97 }
  98
  99 struct obd_type *class_search_type(const char *name)
 100 {
 101         struct list_head *tmp;
 102         struct obd_type *type;
 103
 104         spin_lock(&obd_types_lock);
 105         list_for_each(tmp, &obd_types) {
 106                 type = list_entry(tmp, struct obd_type, typ_chain);
 107                 if (strcmp(type->typ_name, name) == 0) {
 108                         spin_unlock(&obd_types_lock);
 109                         return type;
 110                 }
 111         }
 112         spin_unlock(&obd_types_lock);
 113         return NULL;
 114 }
 115
 116 struct obd_type *class_get_type(const char *name)
 117 {
 118         struct obd_type *type = class_search_type(name);
 119
 120 #ifdef CONFIG_KMOD
 121         if (!type) {
 122                 const char *modname = name;
 123                 if (!request_module(modname)) {
 124                         CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
 125                         type = class_search_type(name);
 126                 } else {
 127                         LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
 128                                            modname);
 129                 }
 130         }
 131 #endif
 132         if (type) {
 133                 spin_lock(&type->obd_type_lock);
 134                 type->typ_refcnt++;
 135                 try_module_get(type->typ_dt_ops->o_owner);
 136                 spin_unlock(&type->obd_type_lock);
 137         }
 138         return type;
 139 }
 140
 141 void class_put_type(struct obd_type *type)
 142 {
 143         LASSERT(type);
 144         spin_lock(&type->obd_type_lock);
 145         type->typ_refcnt--;
 146         module_put(type->typ_dt_ops->o_owner);
 147         spin_unlock(&type->obd_type_lock);
 148 }
 149
 150 #define CLASS_MAX_NAME 1024
 151
 152 int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
 153                         struct lprocfs_vars *vars, const char *name,
 154                         struct lu_device_type *ldt)
 155 {
 156         struct obd_type *type;
 157         int rc = 0;
 158         ENTRY;
 159
 160         /* sanity check */
 161         LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
 162
 163         if (class_search_type(name)) {
 164                 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
 165                 RETURN(-EEXIST);
 166         }
 167
 168         rc = -ENOMEM;
 169         OBD_ALLOC(type, sizeof(*type));
 170         if (type == NULL)
 171                 RETURN(rc);
 172
 173         OBD_ALLOC_PTR(type->typ_dt_ops);
 174         OBD_ALLOC_PTR(type->typ_md_ops);
 175         OBD_ALLOC(type->typ_name, strlen(name) + 1);
 176
 177         if (type->typ_dt_ops == NULL ||
 178             type->typ_md_ops == NULL ||
 179             type->typ_name == NULL)
 180                 GOTO (failed, rc);
 181
 182         *(type->typ_dt_ops) = *dt_ops;
 183         /* md_ops is optional */
 184         if (md_ops)
 185                 *(type->typ_md_ops) = *md_ops;
 186         strcpy(type->typ_name, name);
 187         spin_lock_init(&type->obd_type_lock);
 188
 189 #ifdef LPROCFS
 190         type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root,
 191                                               vars, type);
 192         if (IS_ERR(type->typ_procroot)) {
 193                 rc = PTR_ERR(type->typ_procroot);
 194                 type->typ_procroot = NULL;
 195                 GOTO (failed, rc);
 196         }
 197 #endif
 198         if (ldt != NULL) {
 199                 type->typ_lu = ldt;
 200                 rc = lu_device_type_init(ldt);
 201                 if (rc != 0)
 202                         GOTO (failed, rc);
 203         }
 204
 205         spin_lock(&obd_types_lock);
 206         list_add(&type->typ_chain, &obd_types);
 207         spin_unlock(&obd_types_lock);
 208
 209         RETURN (0);
 210
 211  failed:
 212         if (type->typ_name != NULL)
 213                 OBD_FREE(type->typ_name, strlen(name) + 1);
 214         if (type->typ_md_ops != NULL)
 215                 OBD_FREE_PTR(type->typ_md_ops);
 216         if (type->typ_dt_ops != NULL)
 217                 OBD_FREE_PTR(type->typ_dt_ops);
 218         OBD_FREE(type, sizeof(*type));
 219         RETURN(rc);
 220 }
 221
 222 int class_unregister_type(const char *name)
 223 {
 224         struct obd_type *type = class_search_type(name);
 225         ENTRY;
 226
 227         if (!type) {
 228                 CERROR("unknown obd type\n");
 229                 RETURN(-EINVAL);
 230         }
 231
 232         if (type->typ_refcnt) {
 233                 CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt);
 234                 /* This is a bad situation, let's make the best of it */
 235                 /* Remove ops, but leave the name for debugging */
 236                 OBD_FREE_PTR(type->typ_dt_ops);
 237                 OBD_FREE_PTR(type->typ_md_ops);
 238                 RETURN(-EBUSY);
 239         }
 240
 241         if (type->typ_procroot) {
 242                 lprocfs_remove(&type->typ_procroot);
 243         }
 244
 245         if (type->typ_lu)
 246                 lu_device_type_fini(type->typ_lu);
 247
 248         spin_lock(&obd_types_lock);
 249         list_del(&type->typ_chain);
 250         spin_unlock(&obd_types_lock);
 251         OBD_FREE(type->typ_name, strlen(name) + 1);
 252         if (type->typ_dt_ops != NULL)
 253                 OBD_FREE_PTR(type->typ_dt_ops);
 254         if (type->typ_md_ops != NULL)
 255                 OBD_FREE_PTR(type->typ_md_ops);
 256         OBD_FREE(type, sizeof(*type));
 257         RETURN(0);
 258 } /* class_unregister_type */
 259
 260 /**
 261  * Create a new obd device.
 262  *
 263  * Find an empty slot in ::obd_devs[], create a new obd device in it.
 264  *
 265  * \param typename [in] obd device type string.
 266  * \param name     [in] obd device name.
 267  *
 268  * \retval NULL if create fails, otherwise return the obd device
 269  *         pointer created.
 270  */
 271 struct obd_device *class_newdev(const char *type_name, const char *name)
 272 {
 273         struct obd_device *result = NULL;
 274         struct obd_device *newdev;
 275         struct obd_type *type = NULL;
 276         int i;
 277         int new_obd_minor = 0;
 278
 279         if (strlen(name) >= MAX_OBD_NAME) {
 280                 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
 281                 RETURN(ERR_PTR(-EINVAL));
 282         }
 283
 284         type = class_get_type(type_name);
 285         if (type == NULL){
 286                 CERROR("OBD: unknown type: %s\n", type_name);
 287                 RETURN(ERR_PTR(-ENODEV));
 288         }
 289
 290         newdev = obd_device_alloc();
 291         if (newdev == NULL) {
 292                 class_put_type(type);
 293                 RETURN(ERR_PTR(-ENOMEM));
 294         }
 295         LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
 296
 297         spin_lock(&obd_dev_lock);
 298         for (i = 0; i < class_devno_max(); i++) {
 299                 struct obd_device *obd = class_num2obd(i);
 300                 if (obd && obd->obd_name &&
 301                     (strcmp(name, obd->obd_name) == 0)) {
 302                         CERROR("Device %s already exists, won't add\n", name);
 303                         if (result) {
 304                                 LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
 305                                          "%p obd_magic %08x != %08x\n", result,
 306                                          result->obd_magic, OBD_DEVICE_MAGIC);
 307                                 LASSERTF(result->obd_minor == new_obd_minor,
 308                                          "%p obd_minor %d != %d\n", result,
 309                                          result->obd_minor, new_obd_minor);
 310
 311                                 obd_devs[result->obd_minor] = NULL;
 312                                 result->obd_name[0]='\0';
 313                          }
 314                         result = ERR_PTR(-EEXIST);
 315                         break;
 316                 }
 317                 if (!result && !obd) {
 318                         result = newdev;
 319                         result->obd_minor = i;
 320                         new_obd_minor = i;
 321                         result->obd_type = type;
 322                         strncpy(result->obd_name, name,
 323                                 sizeof(result->obd_name) - 1);
 324                         obd_devs[i] = result;
 325                 }
 326         }
 327         spin_unlock(&obd_dev_lock);
 328
 329         if (result == NULL && i >= class_devno_max()) {
 330                 CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n",
 331                        class_devno_max());
 332                 result = ERR_PTR(-EOVERFLOW);
 333         }
 334
 335         if (IS_ERR(result)) {
 336                 obd_device_free(newdev);
 337                 class_put_type(type);
 338         } else {
 339                 CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
 340                        result->obd_name, result);
 341         }
 342         return result;
 343 }
 344
 345 void class_release_dev(struct obd_device *obd)
 346 {
 347         struct obd_type *obd_type = obd->obd_type;
 348
 349         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n",
 350                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 351         LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
 352                  obd, obd->obd_minor, obd_devs[obd->obd_minor]);
 353         LASSERT(obd_type != NULL);
 354
 355         CDEBUG(D_INFO, "Release obd device %s obd_type name =%s\n",
 356                obd->obd_name,obd->obd_type->typ_name);
 357
 358         spin_lock(&obd_dev_lock);
 359         obd_devs[obd->obd_minor] = NULL;
 360         spin_unlock(&obd_dev_lock);
 361         obd_device_free(obd);
 362
 363         class_put_type(obd_type);
 364 }
 365
 366 int class_name2dev(const char *name)
 367 {
 368         int i;
 369
 370         if (!name)
 371                 return -1;
 372
 373         spin_lock(&obd_dev_lock);
 374         for (i = 0; i < class_devno_max(); i++) {
 375                 struct obd_device *obd = class_num2obd(i);
 376                 if (obd && obd->obd_name && strcmp(name, obd->obd_name) == 0) {
 377                         /* Make sure we finished attaching before we give
 378                            out any references */
 379                         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 380                         if (obd->obd_attached) {
 381                                 spin_unlock(&obd_dev_lock);
 382                                 return i;
 383                         }
 384                         break;
 385                 }
 386         }
 387         spin_unlock(&obd_dev_lock);
 388
 389         return -1;
 390 }
 391
 392 struct obd_device *class_name2obd(const char *name)
 393 {
 394         int dev = class_name2dev(name);
 395
 396         if (dev < 0 || dev > class_devno_max())
 397                 return NULL;
 398         return class_num2obd(dev);
 399 }
 400
 401 int class_uuid2dev(struct obd_uuid *uuid)
 402 {
 403         int i;
 404
 405         spin_lock(&obd_dev_lock);
 406         for (i = 0; i < class_devno_max(); i++) {
 407                 struct obd_device *obd = class_num2obd(i);
 408                 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
 409                         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 410                         spin_unlock(&obd_dev_lock);
 411                         return i;
 412                 }
 413         }
 414         spin_unlock(&obd_dev_lock);
 415
 416         return -1;
 417 }
 418
 419 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
 420 {
 421         int dev = class_uuid2dev(uuid);
 422         if (dev < 0)
 423                 return NULL;
 424         return class_num2obd(dev);
 425 }
 426
 427 /**
 428  * Get obd device from ::obd_devs[]
 429  *
 430  * \param num [in] array index
 431  *
 432  * \retval NULL if ::obd_devs[\a num] does not contains an obd device
 433  *         otherwise return the obd device there.
 434  */
 435 struct obd_device *class_num2obd(int num)
 436 {
 437         struct obd_device *obd = NULL;
 438
 439         if (num < class_devno_max()) {
 440                 obd = obd_devs[num];
 441                 if (obd == NULL)
 442                         return NULL;
 443
 444                 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 445                          "%p obd_magic %08x != %08x\n",
 446                          obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 447                 LASSERTF(obd->obd_minor == num,
 448                          "%p obd_minor %0d != %0d\n",
 449                          obd, obd->obd_minor, num);
 450         }
 451
 452         return obd;
 453 }
 454
 455 void class_obd_list(void)
 456 {
 457         char *status;
 458         int i;
 459
 460         spin_lock(&obd_dev_lock);
 461         for (i = 0; i < class_devno_max(); i++) {
 462                 struct obd_device *obd = class_num2obd(i);
 463                 if (obd == NULL)
 464                         continue;
 465                 if (obd->obd_stopping)
 466                         status = "ST";
 467                 else if (obd->obd_set_up)
 468                         status = "UP";
 469                 else if (obd->obd_attached)
 470                         status = "AT";
 471                 else
 472                         status = "--";
 473                 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
 474                          i, status, obd->obd_type->typ_name,
 475                          obd->obd_name, obd->obd_uuid.uuid,
 476                          atomic_read(&obd->obd_refcount));
 477         }
 478         spin_unlock(&obd_dev_lock);
 479         return;
 480 }
 481
 482 /* Search for a client OBD connected to tgt_uuid.  If grp_uuid is
 483    specified, then only the client with that uuid is returned,
 484    otherwise any client connected to the tgt is returned. */
 485 struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid,
 486                                           const char * typ_name,
 487                                           struct obd_uuid *grp_uuid)
 488 {
 489         int i;
 490
 491         spin_lock(&obd_dev_lock);
 492         for (i = 0; i < class_devno_max(); i++) {
 493                 struct obd_device *obd = class_num2obd(i);
 494                 if (obd == NULL)
 495                         continue;
 496                 if ((strncmp(obd->obd_type->typ_name, typ_name,
 497                              strlen(typ_name)) == 0)) {
 498                         if (obd_uuid_equals(tgt_uuid,
 499                                             &obd->u.cli.cl_target_uuid) &&
 500                             ((grp_uuid)? obd_uuid_equals(grp_uuid,
 501                                                          &obd->obd_uuid) : 1)) {
 502                                 spin_unlock(&obd_dev_lock);
 503                                 return obd;
 504                         }
 505                 }
 506         }
 507         spin_unlock(&obd_dev_lock);
 508
 509         return NULL;
 510 }
 511
 512 /* Iterate the obd_device list looking devices have grp_uuid. Start
 513    searching at *next, and if a device is found, the next index to look
 514    at is saved in *next. If next is NULL, then the first matching device
 515    will always be returned. */
 516 struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
 517 {
 518         int i;
 519
 520         if (next == NULL)
 521                 i = 0;
 522         else if (*next >= 0 && *next < class_devno_max())
 523                 i = *next;
 524         else
 525                 return NULL;
 526
 527         spin_lock(&obd_dev_lock);
 528         for (; i < class_devno_max(); i++) {
 529                 struct obd_device *obd = class_num2obd(i);
 530                 if (obd == NULL)
 531                         continue;
 532                 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
 533                         if (next != NULL)
 534                                 *next = i+1;
 535                         spin_unlock(&obd_dev_lock);
 536                         return obd;
 537                 }
 538         }
 539         spin_unlock(&obd_dev_lock);
 540
 541         return NULL;
 542 }
 543
 544 /**
 545  * to notify sptlrpc log for @fsname has changed, let every relevant OBD
 546  * adjust sptlrpc settings accordingly.
 547  */
 548 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
 549 {
 550         struct obd_device  *obd;
 551         const char         *type;
 552         int                 i, rc = 0, rc2;
 553
 554         LASSERT(namelen > 0);
 555
 556         spin_lock(&obd_dev_lock);
 557         for (i = 0; i < class_devno_max(); i++) {
 558                 obd = class_num2obd(i);
 559
 560                 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
 561                         continue;
 562
 563                 /* only notify mdc, osc, mdt, ost */
 564                 type = obd->obd_type->typ_name;
 565                 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
 566                     strcmp(type, LUSTRE_OSC_NAME) != 0 &&
 567                     strcmp(type, LUSTRE_MDT_NAME) != 0 &&
 568                     strcmp(type, LUSTRE_OST_NAME) != 0)
 569                         continue;
 570
 571                 if (strncmp(obd->obd_name, fsname, namelen))
 572                         continue;
 573
 574                 class_incref(obd, __FUNCTION__, obd);
 575                 spin_unlock(&obd_dev_lock);
 576                 rc2 = obd_set_info_async(obd->obd_self_export,
 577                                          sizeof(KEY_SPTLRPC_CONF),
 578                                          KEY_SPTLRPC_CONF, 0, NULL, NULL);
 579                 rc = rc ? rc : rc2;
 580                 class_decref(obd, __FUNCTION__, obd);
 581                 spin_lock(&obd_dev_lock);
 582         }
 583         spin_unlock(&obd_dev_lock);
 584         return rc;
 585 }
 586 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
 587
 588 void obd_cleanup_caches(void)
 589 {
 590         int rc;
 591
 592         ENTRY;
 593         if (obd_device_cachep) {
 594                 rc = cfs_mem_cache_destroy(obd_device_cachep);
 595                 LASSERTF(rc == 0, "Cannot destropy ll_obd_device_cache: rc %d\n", rc);
 596                 obd_device_cachep = NULL;
 597         }
 598         if (obdo_cachep) {
 599                 rc = cfs_mem_cache_destroy(obdo_cachep);
 600                 LASSERTF(rc == 0, "Cannot destory ll_obdo_cache\n");
 601                 obdo_cachep = NULL;
 602         }
 603         if (import_cachep) {
 604                 rc = cfs_mem_cache_destroy(import_cachep);
 605                 LASSERTF(rc == 0, "Cannot destory ll_import_cache\n");
 606                 import_cachep = NULL;
 607         }
 608         if (capa_cachep) {
 609                 rc = cfs_mem_cache_destroy(capa_cachep);
 610                 LASSERTF(rc == 0, "Cannot destory capa_cache\n");
 611                 capa_cachep = NULL;
 612         }
 613         EXIT;
 614 }
 615
 616 int obd_init_caches(void)
 617 {
 618         ENTRY;
 619
 620         LASSERT(obd_device_cachep == NULL);
 621         obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache",
 622                                                  sizeof(struct obd_device),
 623                                                  0, 0);
 624         if (!obd_device_cachep)
 625                 GOTO(out, -ENOMEM);
 626
 627         LASSERT(obdo_cachep == NULL);
 628         obdo_cachep = cfs_mem_cache_create("ll_obdo_cache", sizeof(struct obdo),
 629                                            0, 0);
 630         if (!obdo_cachep)
 631                 GOTO(out, -ENOMEM);
 632
 633         LASSERT(import_cachep == NULL);
 634         import_cachep = cfs_mem_cache_create("ll_import_cache",
 635                                              sizeof(struct obd_import),
 636                                              0, 0);
 637         if (!import_cachep)
 638                 GOTO(out, -ENOMEM);
 639
 640         LASSERT(capa_cachep == NULL);
 641         capa_cachep = cfs_mem_cache_create("capa_cache",
 642                                            sizeof(struct obd_capa), 0, 0);
 643         if (!capa_cachep)
 644                 GOTO(out, -ENOMEM);
 645
 646         RETURN(0);
 647  out:
 648         obd_cleanup_caches();
 649         RETURN(-ENOMEM);
 650
 651 }
 652
 653 /* map connection to client */
 654 struct obd_export *class_conn2export(struct lustre_handle *conn)
 655 {
 656         struct obd_export *export;
 657         ENTRY;
 658
 659         if (!conn) {
 660                 CDEBUG(D_CACHE, "looking for null handle\n");
 661                 RETURN(NULL);
 662         }
 663
 664         if (conn->cookie == -1) {  /* this means assign a new connection */
 665                 CDEBUG(D_CACHE, "want a new connection\n");
 666                 RETURN(NULL);
 667         }
 668
 669         CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie);
 670         export = class_handle2object(conn->cookie);
 671         RETURN(export);
 672 }
 673
 674 struct obd_device *class_exp2obd(struct obd_export *exp)
 675 {
 676         if (exp)
 677                 return exp->exp_obd;
 678         return NULL;
 679 }
 680
 681 struct obd_device *class_conn2obd(struct lustre_handle *conn)
 682 {
 683         struct obd_export *export;
 684         export = class_conn2export(conn);
 685         if (export) {
 686                 struct obd_device *obd = export->exp_obd;
 687                 class_export_put(export);
 688                 return obd;
 689         }
 690         return NULL;
 691 }
 692
 693 struct obd_import *class_exp2cliimp(struct obd_export *exp)
 694 {
 695         struct obd_device *obd = exp->exp_obd;
 696         if (obd == NULL)
 697                 return NULL;
 698         return obd->u.cli.cl_import;
 699 }
 700
 701 struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
 702 {
 703         struct obd_device *obd = class_conn2obd(conn);
 704         if (obd == NULL)
 705                 return NULL;
 706         return obd->u.cli.cl_import;
 707 }
 708
 709 /* Export management functions */
 710 static void class_export_destroy(struct obd_export *exp)
 711 {
 712         struct obd_device *obd = exp->exp_obd;
 713         ENTRY;
 714
 715         LASSERT (atomic_read(&exp->exp_refcount) == 0);
 716
 717         CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
 718                exp->exp_client_uuid.uuid, obd->obd_name);
 719
 720         LASSERT(obd != NULL);
 721
 722         /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
 723         if (exp->exp_connection)
 724                 ptlrpc_put_connection_superhack(exp->exp_connection);
 725
 726         LASSERT(list_empty(&exp->exp_outstanding_replies));
 727         LASSERT(list_empty(&exp->exp_uncommitted_replies));
 728         LASSERT(list_empty(&exp->exp_req_replay_queue));
 729         LASSERT(list_empty(&exp->exp_queued_rpc));
 730         obd_destroy_export(exp);
 731         class_decref(obd, "export", exp);
 732
 733         OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
 734         EXIT;
 735 }
 736
 737 static void export_handle_addref(void *export)
 738 {
 739         class_export_get(export);
 740 }
 741
 742 struct obd_export *class_export_get(struct obd_export *exp)
 743 {
 744         atomic_inc(&exp->exp_refcount);
 745         CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
 746                atomic_read(&exp->exp_refcount));
 747         return exp;
 748 }
 749 EXPORT_SYMBOL(class_export_get);
 750
 751 void class_export_put(struct obd_export *exp)
 752 {
 753         LASSERT(exp != NULL);
 754         CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
 755                atomic_read(&exp->exp_refcount) - 1);
 756         LASSERT(atomic_read(&exp->exp_refcount) > 0);
 757         LASSERT(atomic_read(&exp->exp_refcount) < 0x5a5a5a);
 758
 759         if (atomic_dec_and_test(&exp->exp_refcount)) {
 760                 LASSERT(!list_empty(&exp->exp_obd_chain));
 761                 CDEBUG(D_IOCTL, "final put %p/%s\n",
 762                        exp, exp->exp_client_uuid.uuid);
 763                 obd_zombie_export_add(exp);
 764         }
 765 }
 766 EXPORT_SYMBOL(class_export_put);
 767
 768 /* Creates a new export, adds it to the hash table, and returns a
 769  * pointer to it. The refcount is 2: one for the hash reference, and
 770  * one for the pointer returned by this function. */
 771 struct obd_export *class_new_export(struct obd_device *obd,
 772                                     struct obd_uuid *cluuid)
 773 {
 774         struct obd_export *export;
 775         int rc = 0;
 776
 777         OBD_ALLOC_PTR(export);
 778         if (!export)
 779                 return ERR_PTR(-ENOMEM);
 780
 781         export->exp_conn_cnt = 0;
 782         export->exp_lock_hash = NULL;
 783         atomic_set(&export->exp_refcount, 2);
 784         atomic_set(&export->exp_rpc_count, 0);
 785         atomic_set(&export->exp_cb_count, 0);
 786         atomic_set(&export->exp_locks_count, 0);
 787         atomic_set(&export->exp_replay_count, 0);
 788         export->exp_obd = obd;
 789         CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies);
 790         spin_lock_init(&export->exp_uncommitted_replies_lock);
 791         CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies);
 792         CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue);
 793         CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
 794         CFS_INIT_LIST_HEAD(&export->exp_queued_rpc);
 795         class_handle_hash(&export->exp_handle, export_handle_addref);
 796         export->exp_last_request_time = cfs_time_current_sec();
 797         spin_lock_init(&export->exp_lock);
 798         INIT_HLIST_NODE(&export->exp_uuid_hash);
 799         INIT_HLIST_NODE(&export->exp_nid_hash);
 800
 801         export->exp_sp_peer = LUSTRE_SP_ANY;
 802         export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
 803         export->exp_client_uuid = *cluuid;
 804         obd_init_export(export);
 805
 806         spin_lock(&obd->obd_dev_lock);
 807         if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
 808                 rc = lustre_hash_add_unique(obd->obd_uuid_hash, cluuid,
 809                                             &export->exp_uuid_hash);
 810                 if (rc != 0) {
 811                         LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
 812                                       obd->obd_name, cluuid->uuid, rc);
 813                         spin_unlock(&obd->obd_dev_lock);
 814                         class_handle_unhash(&export->exp_handle);
 815                         OBD_FREE_PTR(export);
 816                         return ERR_PTR(-EALREADY);
 817                 }
 818         }
 819
 820         LASSERT(!obd->obd_stopping); /* shouldn't happen, but might race */
 821         class_incref(obd, "export", export);
 822         list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
 823         list_add_tail(&export->exp_obd_chain_timed,
 824                       &export->exp_obd->obd_exports_timed);
 825         export->exp_obd->obd_num_exports++;
 826         spin_unlock(&obd->obd_dev_lock);
 827
 828         return export;
 829 }
 830 EXPORT_SYMBOL(class_new_export);
 831
 832 void class_unlink_export(struct obd_export *exp)
 833 {
 834         class_handle_unhash(&exp->exp_handle);
 835
 836         spin_lock(&exp->exp_obd->obd_dev_lock);
 837         /* delete an uuid-export hashitem from hashtables */
 838         if (!hlist_unhashed(&exp->exp_uuid_hash))
 839                 lustre_hash_del(exp->exp_obd->obd_uuid_hash,
 840                                 &exp->exp_client_uuid,
 841                                 &exp->exp_uuid_hash);
 842
 843         list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
 844         list_del_init(&exp->exp_obd_chain_timed);
 845         exp->exp_obd->obd_num_exports--;
 846         spin_unlock(&exp->exp_obd->obd_dev_lock);
 847         class_export_put(exp);
 848 }
 849 EXPORT_SYMBOL(class_unlink_export);
 850
 851 /* Import management functions */
 852 void class_import_destroy(struct obd_import *imp)
 853 {
 854         ENTRY;
 855
 856         CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
 857                 imp->imp_obd->obd_name);
 858
 859         LASSERT(atomic_read(&imp->imp_refcount) == 0);
 860
 861         ptlrpc_put_connection_superhack(imp->imp_connection);
 862
 863         while (!list_empty(&imp->imp_conn_list)) {
 864                 struct obd_import_conn *imp_conn;
 865
 866                 imp_conn = list_entry(imp->imp_conn_list.next,
 867                                       struct obd_import_conn, oic_item);
 868                 list_del_init(&imp_conn->oic_item);
 869                 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
 870                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 871         }
 872
 873         LASSERT(imp->imp_sec == NULL);
 874         class_decref(imp->imp_obd, "import", imp);
 875         OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
 876         EXIT;
 877 }
 878
 879 static void import_handle_addref(void *import)
 880 {
 881         class_import_get(import);
 882 }
 883
 884 struct obd_import *class_import_get(struct obd_import *import)
 885 {
 886         LASSERT(atomic_read(&import->imp_refcount) >= 0);
 887         LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a);
 888         atomic_inc(&import->imp_refcount);
 889         CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
 890                atomic_read(&import->imp_refcount),
 891                import->imp_obd->obd_name);
 892         return import;
 893 }
 894 EXPORT_SYMBOL(class_import_get);
 895
 896 void class_import_put(struct obd_import *imp)
 897 {
 898         ENTRY;
 899
 900         LASSERT(atomic_read(&imp->imp_refcount) > 0);
 901         LASSERT(atomic_read(&imp->imp_refcount) < 0x5a5a5a);
 902         LASSERT(list_empty(&imp->imp_zombie_chain));
 903
 904         CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
 905                atomic_read(&imp->imp_refcount) - 1,
 906                imp->imp_obd->obd_name);
 907
 908         if (atomic_dec_and_test(&imp->imp_refcount)) {
 909                 CDEBUG(D_INFO, "final put import %p\n", imp);
 910                 obd_zombie_import_add(imp);
 911         }
 912
 913         EXIT;
 914 }
 915 EXPORT_SYMBOL(class_import_put);
 916
 917 static void init_imp_at(struct imp_at *at) {
 918         int i;
 919         at_init(&at->iat_net_latency, 0, 0);
 920         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
 921                 /* max service estimates are tracked on the server side, so
 922                    don't use the AT history here, just use the last reported
 923                    val. (But keep hist for proc histogram, worst_ever) */
 924                 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
 925                         AT_FLG_NOHIST);
 926         }
 927 }
 928
 929 struct obd_import *class_new_import(struct obd_device *obd)
 930 {
 931         struct obd_import *imp;
 932
 933         OBD_ALLOC(imp, sizeof(*imp));
 934         if (imp == NULL)
 935                 return NULL;
 936
 937         CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain);
 938         CFS_INIT_LIST_HEAD(&imp->imp_replay_list);
 939         CFS_INIT_LIST_HEAD(&imp->imp_sending_list);
 940         CFS_INIT_LIST_HEAD(&imp->imp_delayed_list);
 941         spin_lock_init(&imp->imp_lock);
 942         imp->imp_last_success_conn = 0;
 943         imp->imp_state = LUSTRE_IMP_NEW;
 944         imp->imp_obd = class_incref(obd, "import", imp);
 945         sema_init(&imp->imp_sec_mutex, 1);
 946         cfs_waitq_init(&imp->imp_recovery_waitq);
 947
 948         atomic_set(&imp->imp_refcount, 2);
 949         atomic_set(&imp->imp_unregistering, 0);
 950         atomic_set(&imp->imp_inflight, 0);
 951         atomic_set(&imp->imp_replay_inflight, 0);
 952         atomic_set(&imp->imp_inval_count, 0);
 953         CFS_INIT_LIST_HEAD(&imp->imp_conn_list);
 954         CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link);
 955         class_handle_hash(&imp->imp_handle, import_handle_addref);
 956         init_imp_at(&imp->imp_at);
 957
 958         /* the default magic is V2, will be used in connect RPC, and
 959          * then adjusted according to the flags in request/reply. */
 960         imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
 961
 962         return imp;
 963 }
 964 EXPORT_SYMBOL(class_new_import);
 965
 966 void class_destroy_import(struct obd_import *import)
 967 {
 968         LASSERT(import != NULL);
 969         LASSERT(import != LP_POISON);
 970
 971         class_handle_unhash(&import->imp_handle);
 972
 973         spin_lock(&import->imp_lock);
 974         import->imp_generation++;
 975         spin_unlock(&import->imp_lock);
 976         class_import_put(import);
 977 }
 978 EXPORT_SYMBOL(class_destroy_import);
 979
 980 /* A connection defines an export context in which preallocation can
 981    be managed. This releases the export pointer reference, and returns
 982    the export handle, so the export refcount is 1 when this function
 983    returns. */
 984 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
 985                   struct obd_uuid *cluuid)
 986 {
 987         struct obd_export *export;
 988         LASSERT(conn != NULL);
 989         LASSERT(obd != NULL);
 990         LASSERT(cluuid != NULL);
 991         ENTRY;
 992
 993         export = class_new_export(obd, cluuid);
 994         if (IS_ERR(export))
 995                 RETURN(PTR_ERR(export));
 996
 997         conn->cookie = export->exp_handle.h_cookie;
 998         class_export_put(export);
 999
1000         CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1001                cluuid->uuid, conn->cookie);
1002         RETURN(0);
1003 }
1004 EXPORT_SYMBOL(class_connect);
1005
1006 /* if export is involved in recovery then clean up related things */
1007 void class_export_recovery_cleanup(struct obd_export *exp)
1008 {
1009         struct obd_device *obd = exp->exp_obd;
1010
1011         spin_lock_bh(&obd->obd_processing_task_lock);
1012         if (exp->exp_delayed)
1013                 obd->obd_delayed_clients--;
1014         if (obd->obd_recovering && exp->exp_in_recovery) {
1015                 spin_lock(&exp->exp_lock);
1016                 exp->exp_in_recovery = 0;
1017                 spin_unlock(&exp->exp_lock);
1018                 LASSERT(obd->obd_connected_clients);
1019                 obd->obd_connected_clients--;
1020         }
1021         /** Cleanup req replay fields */
1022         if (exp->exp_req_replay_needed) {
1023                 spin_lock(&exp->exp_lock);
1024                 exp->exp_req_replay_needed = 0;
1025                 spin_unlock(&exp->exp_lock);
1026                 LASSERT(atomic_read(&obd->obd_req_replay_clients));
1027                 atomic_dec(&obd->obd_req_replay_clients);
1028         }
1029         /** Cleanup lock replay data */
1030         if (exp->exp_lock_replay_needed) {
1031                 spin_lock(&exp->exp_lock);
1032                 exp->exp_lock_replay_needed = 0;
1033                 spin_unlock(&exp->exp_lock);
1034                 LASSERT(atomic_read(&obd->obd_lock_replay_clients));
1035                 atomic_dec(&obd->obd_lock_replay_clients);
1036         }
1037         spin_unlock_bh(&obd->obd_processing_task_lock);
1038 }
1039
1040 /* This function removes 1-3 references from the export:
1041  * 1 - for export pointer passed
1042  * and if disconnect really need
1043  * 2 - removing from hash
1044  * 3 - in client_unlink_export
1045  * The export pointer passed to this function can destroyed */
1046 int class_disconnect(struct obd_export *export)
1047 {
1048         int already_disconnected;
1049         ENTRY;
1050
1051         if (export == NULL) {
1052                 fixme();
1053                 CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export);
1054                 RETURN(-EINVAL);
1055         }
1056
1057         spin_lock(&export->exp_lock);
1058         already_disconnected = export->exp_disconnected;
1059         export->exp_disconnected = 1;
1060         spin_unlock(&export->exp_lock);
1061
1062         /* class_cleanup(), abort_recovery(), and class_fail_export()
1063          * all end up in here, and if any of them race we shouldn't
1064          * call extra class_export_puts(). */
1065         if (already_disconnected) {
1066                 LASSERT(hlist_unhashed(&export->exp_nid_hash));
1067                 GOTO(no_disconn, already_disconnected);
1068         }
1069
1070         CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1071                export->exp_handle.h_cookie);
1072
1073         if (!hlist_unhashed(&export->exp_nid_hash))
1074                 lustre_hash_del(export->exp_obd->obd_nid_hash,
1075                                 &export->exp_connection->c_peer.nid,
1076                                 &export->exp_nid_hash);
1077
1078         class_export_recovery_cleanup(export);
1079         class_unlink_export(export);
1080 no_disconn:
1081         class_export_put(export);
1082         RETURN(0);
1083 }
1084
1085 static void class_disconnect_export_list(struct list_head *list,
1086                                          enum obd_option flags)
1087 {
1088         int rc;
1089         struct obd_export *exp;
1090         ENTRY;
1091
1092         /* It's possible that an export may disconnect itself, but
1093          * nothing else will be added to this list. */
1094         while (!list_empty(list)) {
1095                 exp = list_entry(list->next, struct obd_export, exp_obd_chain);
1096                 /* need for safe call CDEBUG after obd_disconnect */
1097                 class_export_get(exp);
1098
1099                 spin_lock(&exp->exp_lock);
1100                 exp->exp_flags = flags;
1101                 spin_unlock(&exp->exp_lock);
1102
1103                 if (obd_uuid_equals(&exp->exp_client_uuid,
1104                                     &exp->exp_obd->obd_uuid)) {
1105                         CDEBUG(D_HA,
1106                                "exp %p export uuid == obd uuid, don't discon\n",
1107                                exp);
1108                         /* Need to delete this now so we don't end up pointing
1109                          * to work_list later when this export is cleaned up. */
1110                         list_del_init(&exp->exp_obd_chain);
1111                         class_export_put(exp);
1112                         continue;
1113                 }
1114
1115                 class_export_get(exp);
1116                 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1117                        "last request at "CFS_TIME_T"\n",
1118                        exp->exp_obd->obd_name, obd_export_nid2str(exp),
1119                        exp, exp->exp_last_request_time);
1120                 /* release one export reference anyway */
1121                 rc = obd_disconnect(exp);
1122
1123                 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1124                        obd_export_nid2str(exp), exp, rc);
1125                 class_export_put(exp);
1126         }
1127         EXIT;
1128 }
1129
1130 void class_disconnect_exports(struct obd_device *obd)
1131 {
1132         struct list_head work_list;
1133         ENTRY;
1134
1135         /* Move all of the exports from obd_exports to a work list, en masse. */
1136         CFS_INIT_LIST_HEAD(&work_list);
1137         spin_lock(&obd->obd_dev_lock);
1138         list_splice_init(&obd->obd_exports, &work_list);
1139         list_splice_init(&obd->obd_delayed_exports, &work_list);
1140         spin_unlock(&obd->obd_dev_lock);
1141
1142         if (!list_empty(&work_list)) {
1143                 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1144                        "disconnecting them\n", obd->obd_minor, obd);
1145                 class_disconnect_export_list(&work_list,
1146                                              exp_flags_from_obd(obd));
1147         } else
1148                 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1149                        obd->obd_minor, obd);
1150         EXIT;
1151 }
1152 EXPORT_SYMBOL(class_disconnect_exports);
1153
1154 /* Remove exports that have not completed recovery.
1155  */
1156 void class_disconnect_stale_exports(struct obd_device *obd,
1157                                     int (*test_export)(struct obd_export *))
1158 {
1159         struct list_head work_list;
1160         struct list_head *pos, *n;
1161         struct obd_export *exp;
1162         int evicted = 0;
1163         ENTRY;
1164
1165         CFS_INIT_LIST_HEAD(&work_list);
1166         spin_lock(&obd->obd_dev_lock);
1167         list_for_each_safe(pos, n, &obd->obd_exports) {
1168                 exp = list_entry(pos, struct obd_export, exp_obd_chain);
1169                 if (test_export(exp))
1170                         continue;
1171
1172                 /* don't count self-export as client */
1173                 if (obd_uuid_equals(&exp->exp_client_uuid,
1174                                     &exp->exp_obd->obd_uuid))
1175                         continue;
1176
1177                 list_move(&exp->exp_obd_chain, &work_list);
1178                 evicted++;
1179                 CDEBUG(D_ERROR, "%s: disconnect stale client %s@%s\n",
1180                        obd->obd_name, exp->exp_client_uuid.uuid,
1181                        exp->exp_connection == NULL ? "<unknown>" :
1182                        libcfs_nid2str(exp->exp_connection->c_peer.nid));
1183                 print_export_data(exp, "EVICTING");
1184         }
1185         spin_unlock(&obd->obd_dev_lock);
1186
1187         if (evicted) {
1188                 CDEBUG(D_HA, "%s: disconnecting %d stale clients\n",
1189                        obd->obd_name, evicted);
1190                 obd->obd_stale_clients += evicted;
1191         }
1192         class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1193                                                  OBD_OPT_ABORT_RECOV);
1194         EXIT;
1195 }
1196 EXPORT_SYMBOL(class_disconnect_stale_exports);
1197
1198 void class_fail_export(struct obd_export *exp)
1199 {
1200         int rc, already_failed;
1201
1202         spin_lock(&exp->exp_lock);
1203         already_failed = exp->exp_failed;
1204         exp->exp_failed = 1;
1205         spin_unlock(&exp->exp_lock);
1206
1207         if (already_failed) {
1208                 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1209                        exp, exp->exp_client_uuid.uuid);
1210                 return;
1211         }
1212
1213         CDEBUG(D_HA, "disconnecting export %p/%s\n",
1214                exp, exp->exp_client_uuid.uuid);
1215
1216         if (obd_dump_on_timeout)
1217                 libcfs_debug_dumplog();
1218
1219         /* Most callers into obd_disconnect are removing their own reference
1220          * (request, for example) in addition to the one from the hash table.
1221          * We don't have such a reference here, so make one. */
1222         class_export_get(exp);
1223         rc = obd_disconnect(exp);
1224         if (rc)
1225                 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1226         else
1227                 CDEBUG(D_HA, "disconnected export %p/%s\n",
1228                        exp, exp->exp_client_uuid.uuid);
1229 }
1230 EXPORT_SYMBOL(class_fail_export);
1231
1232 char *obd_export_nid2str(struct obd_export *exp)
1233 {
1234         if (exp->exp_connection != NULL)
1235                 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1236
1237         return "(no nid)";
1238 }
1239 EXPORT_SYMBOL(obd_export_nid2str);
1240
1241 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1242 {
1243         struct obd_export *doomed_exp = NULL;
1244         int exports_evicted = 0;
1245
1246         lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1247
1248         do {
1249                 doomed_exp = lustre_hash_lookup(obd->obd_nid_hash, &nid_key);
1250                 if (doomed_exp == NULL)
1251                         break;
1252
1253                 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1254                          "nid %s found, wanted nid %s, requested nid %s\n",
1255                          obd_export_nid2str(doomed_exp),
1256                          libcfs_nid2str(nid_key), nid);
1257                 LASSERTF(doomed_exp != obd->obd_self_export,
1258                          "self-export is hashed by NID?\n");
1259                 exports_evicted++;
1260                 CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n",
1261                        obd->obd_name, nid, doomed_exp->exp_client_uuid.uuid,
1262                        exports_evicted);
1263                 class_fail_export(doomed_exp);
1264                 class_export_put(doomed_exp);
1265         } while (1);
1266
1267         if (!exports_evicted)
1268                 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1269                        obd->obd_name, nid);
1270         return exports_evicted;
1271 }
1272 EXPORT_SYMBOL(obd_export_evict_by_nid);
1273
1274 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1275 {
1276         struct obd_export *doomed_exp = NULL;
1277         struct obd_uuid doomed_uuid;
1278         int exports_evicted = 0;
1279
1280         obd_str2uuid(&doomed_uuid, uuid);
1281         if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1282                 CERROR("%s: can't evict myself\n", obd->obd_name);
1283                 return exports_evicted;
1284         }
1285
1286         doomed_exp = lustre_hash_lookup(obd->obd_uuid_hash, &doomed_uuid);
1287
1288         if (doomed_exp == NULL) {
1289                 CERROR("%s: can't disconnect %s: no exports found\n",
1290                        obd->obd_name, uuid);
1291         } else {
1292                 CWARN("%s: evicting %s at adminstrative request\n",
1293                        obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1294                 class_fail_export(doomed_exp);
1295                 class_export_put(doomed_exp);
1296                 exports_evicted++;
1297         }
1298
1299         return exports_evicted;
1300 }
1301 EXPORT_SYMBOL(obd_export_evict_by_uuid);
1302
1303 static void print_export_data(struct obd_export *exp, const char *status)
1304 {
1305         struct ptlrpc_reply_state *rs;
1306         struct ptlrpc_reply_state *first_reply = NULL;
1307         int nreplies = 0;
1308
1309         spin_lock(&exp->exp_lock);
1310         list_for_each_entry (rs, &exp->exp_outstanding_replies, rs_exp_list) {
1311                 if (nreplies == 0)
1312                         first_reply = rs;
1313                 nreplies++;
1314         }
1315         spin_unlock(&exp->exp_lock);
1316
1317         CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1318                exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1319                obd_export_nid2str(exp), atomic_read(&exp->exp_refcount),
1320                atomic_read(&exp->exp_rpc_count),
1321                atomic_read(&exp->exp_cb_count),
1322                atomic_read(&exp->exp_locks_count),
1323                exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1324                nreplies, first_reply, nreplies > 3 ? "..." : "",
1325                exp->exp_last_committed);
1326 }
1327
1328 void dump_exports(struct obd_device *obd)
1329 {
1330         struct obd_export *exp;
1331
1332         spin_lock(&obd->obd_dev_lock);
1333         list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1334                 print_export_data(exp, "ACTIVE");
1335         list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1336                 print_export_data(exp, "UNLINKED");
1337         list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1338                 print_export_data(exp, "DELAYED");
1339         spin_unlock(&obd->obd_dev_lock);
1340         spin_lock(&obd_zombie_impexp_lock);
1341         list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1342                 print_export_data(exp, "ZOMBIE");
1343         spin_unlock(&obd_zombie_impexp_lock);
1344 }
1345 EXPORT_SYMBOL(dump_exports);
1346
1347 void obd_exports_barrier(struct obd_device *obd)
1348 {
1349         int waited = 2;
1350         LASSERT(list_empty(&obd->obd_exports));
1351         spin_lock(&obd->obd_dev_lock);
1352         while (!list_empty(&obd->obd_unlinked_exports)) {
1353                 spin_unlock(&obd->obd_dev_lock);
1354                 cfs_schedule_timeout(CFS_TASK_UNINT, cfs_time_seconds(waited));
1355                 if (waited > 5 && IS_PO2(waited)) {
1356                         LCONSOLE_WARN("Waiting for obd_unlinked_exports "
1357                                       "more than %d seconds. "
1358                                       "The obd refcount = %d. Is it stuck?\n",
1359                                       waited, atomic_read(&obd->obd_refcount));
1360                         dump_exports(obd);
1361                 }
1362                 waited *= 2;
1363                 spin_lock(&obd->obd_dev_lock);
1364         }
1365         spin_unlock(&obd->obd_dev_lock);
1366 }
1367 EXPORT_SYMBOL(obd_exports_barrier);
1368
1369 /**
1370  * kill zombie imports and exports
1371  */
1372 void obd_zombie_impexp_cull(void)
1373 {
1374         struct obd_import *import;
1375         struct obd_export *export;
1376         ENTRY;
1377
1378         do {
1379                 spin_lock(&obd_zombie_impexp_lock);
1380
1381                 import = NULL;
1382                 if (!list_empty(&obd_zombie_imports)) {
1383                         import = list_entry(obd_zombie_imports.next,
1384                                             struct obd_import,
1385                                             imp_zombie_chain);
1386                         list_del_init(&import->imp_zombie_chain);
1387                 }
1388
1389                 export = NULL;
1390                 if (!list_empty(&obd_zombie_exports)) {
1391                         export = list_entry(obd_zombie_exports.next,
1392                                             struct obd_export,
1393                                             exp_obd_chain);
1394                         list_del_init(&export->exp_obd_chain);
1395                 }
1396
1397                 spin_unlock(&obd_zombie_impexp_lock);
1398
1399                 if (import != NULL)
1400                         class_import_destroy(import);
1401
1402                 if (export != NULL)
1403                         class_export_destroy(export);
1404
1405         } while (import != NULL || export != NULL);
1406         EXIT;
1407 }
1408
1409 static struct completion        obd_zombie_start;
1410 static struct completion        obd_zombie_stop;
1411 static unsigned long            obd_zombie_flags;
1412 static cfs_waitq_t              obd_zombie_waitq;
1413
1414 enum {
1415         OBD_ZOMBIE_STOP   = 1 << 1
1416 };
1417
1418 /**
1419  * check for work for kill zombie import/export thread.
1420  */
1421 static int obd_zombie_impexp_check(void *arg)
1422 {
1423         int rc;
1424
1425         spin_lock(&obd_zombie_impexp_lock);
1426         rc = list_empty(&obd_zombie_imports) &&
1427              list_empty(&obd_zombie_exports) &&
1428              !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1429
1430         spin_unlock(&obd_zombie_impexp_lock);
1431
1432         RETURN(rc);
1433 }
1434
1435 /**
1436  * Add export to the obd_zombe thread and notify it.
1437  */
1438 static void obd_zombie_export_add(struct obd_export *exp) {
1439         spin_lock(&exp->exp_obd->obd_dev_lock);
1440         LASSERT(!list_empty(&exp->exp_obd_chain));
1441         list_del_init(&exp->exp_obd_chain);
1442         spin_unlock(&exp->exp_obd->obd_dev_lock);
1443         spin_lock(&obd_zombie_impexp_lock);
1444         list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1445         spin_unlock(&obd_zombie_impexp_lock);
1446
1447         if (obd_zombie_impexp_notify != NULL)
1448                 obd_zombie_impexp_notify();
1449 }
1450
1451 /**
1452  * Add import to the obd_zombe thread and notify it.
1453  */
1454 static void obd_zombie_import_add(struct obd_import *imp) {
1455         LASSERT(imp->imp_sec == NULL);
1456         spin_lock(&obd_zombie_impexp_lock);
1457         LASSERT(list_empty(&imp->imp_zombie_chain));
1458         list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1459         spin_unlock(&obd_zombie_impexp_lock);
1460
1461         if (obd_zombie_impexp_notify != NULL)
1462                 obd_zombie_impexp_notify();
1463 }
1464
1465 /**
1466  * notify import/export destroy thread about new zombie.
1467  */
1468 static void obd_zombie_impexp_notify(void)
1469 {
1470         cfs_waitq_signal(&obd_zombie_waitq);
1471 }
1472
1473 /**
1474  * check whether obd_zombie is idle
1475  */
1476 static int obd_zombie_is_idle(void)
1477 {
1478         int rc;
1479
1480         LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1481         spin_lock(&obd_zombie_impexp_lock);
1482         rc = list_empty(&obd_zombie_imports) &&
1483              list_empty(&obd_zombie_exports);
1484         spin_unlock(&obd_zombie_impexp_lock);
1485         return rc;
1486 }
1487
1488 /**
1489  * wait when obd_zombie import/export queues become empty
1490  */
1491 void obd_zombie_barrier(void)
1492 {
1493         struct l_wait_info lwi = { 0 };
1494         l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1495 }
1496 EXPORT_SYMBOL(obd_zombie_barrier);
1497
1498 #ifdef __KERNEL__
1499
1500 /**
1501  * destroy zombie export/import thread.
1502  */
1503 static int obd_zombie_impexp_thread(void *unused)
1504 {
1505         int rc;
1506
1507         if ((rc = cfs_daemonize_ctxt("obd_zombid"))) {
1508                 complete(&obd_zombie_start);
1509                 RETURN(rc);
1510         }
1511
1512         complete(&obd_zombie_start);
1513
1514         while(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1515                 struct l_wait_info lwi = { 0 };
1516
1517                 l_wait_event(obd_zombie_waitq,
1518                              !obd_zombie_impexp_check(NULL), &lwi);
1519                 obd_zombie_impexp_cull();
1520
1521                 /*
1522                  * Notify obd_zombie_barrier callers that queues
1523                  * may be empty.
1524                  */
1525                 cfs_waitq_signal(&obd_zombie_waitq);
1526         }
1527
1528         complete(&obd_zombie_stop);
1529
1530         RETURN(0);
1531 }
1532
1533 #else /* ! KERNEL */
1534
1535 static atomic_t zombie_recur = ATOMIC_INIT(0);
1536 static void *obd_zombie_impexp_work_cb;
1537 static void *obd_zombie_impexp_idle_cb;
1538
1539 int obd_zombie_impexp_kill(void *arg)
1540 {
1541         int rc = 0;
1542
1543         if (atomic_inc_return(&zombie_recur) == 1) {
1544                 obd_zombie_impexp_cull();
1545                 rc = 1;
1546         }
1547         atomic_dec(&zombie_recur);
1548         return rc;
1549 }
1550
1551 #endif
1552
1553 /**
1554  * start destroy zombie import/export thread
1555  */
1556 int obd_zombie_impexp_init(void)
1557 {
1558         int rc;
1559
1560         CFS_INIT_LIST_HEAD(&obd_zombie_imports);
1561         CFS_INIT_LIST_HEAD(&obd_zombie_exports);
1562         spin_lock_init(&obd_zombie_impexp_lock);
1563         init_completion(&obd_zombie_start);
1564         init_completion(&obd_zombie_stop);
1565         cfs_waitq_init(&obd_zombie_waitq);
1566
1567 #ifdef __KERNEL__
1568         rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
1569         if (rc < 0)
1570                 RETURN(rc);
1571
1572         wait_for_completion(&obd_zombie_start);
1573 #else
1574
1575         obd_zombie_impexp_work_cb =
1576                 liblustre_register_wait_callback("obd_zombi_impexp_kill",
1577                                                  &obd_zombie_impexp_kill, NULL);
1578
1579         obd_zombie_impexp_idle_cb =
1580                 liblustre_register_idle_callback("obd_zombi_impexp_check",
1581                                                  &obd_zombie_impexp_check, NULL);
1582         rc = 0;
1583 #endif
1584         RETURN(rc);
1585 }
1586 /**
1587  * stop destroy zombie import/export thread
1588  */
1589 void obd_zombie_impexp_stop(void)
1590 {
1591         set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1592         obd_zombie_impexp_notify();
1593 #ifdef __KERNEL__
1594         wait_for_completion(&obd_zombie_stop);
1595 #else
1596         liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb);
1597         liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb);
1598 #endif
1599 }
1600