lustre/ldlm/ldlm_lock.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of the Lustre file system, http://www.lustre.org
   9  *   Lustre is a trademark of Cluster File Systems, Inc.
  10  *
  11  *   You may have signed or agreed to another license before downloading
  12  *   this software.  If so, you are bound by the terms and conditions
  13  *   of that agreement, and the following does not apply to you.  See the
  14  *   LICENSE file included with this distribution for more information.
  15  *
  16  *   If you did not agree to a different license, then this copy of Lustre
  17  *   is open source software; you can redistribute it and/or modify it
  18  *   under the terms of version 2 of the GNU General Public License as
  19  *   published by the Free Software Foundation.
  20  *
  21  *   In either case, Lustre is distributed in the hope that it will be
  22  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  23  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *   license text for more details.
  25  */
  26
  27 #define DEBUG_SUBSYSTEM S_LDLM
  28
  29 #ifdef __KERNEL__
  30 # include <libcfs/libcfs.h>
  31 # include <linux/lustre_intent.h>
  32 #else
  33 # include <liblustre.h>
  34 # include <libcfs/kp30.h>
  35 #endif
  36
  37 #include <obd_class.h>
  38 #include "ldlm_internal.h"
  39
  40 //struct lustre_lock ldlm_everything_lock;
  41
  42 /* lock's skip list pointers fix mode */
  43 #define LDLM_JOIN_NONE          0
  44 #define LDLM_MODE_JOIN_RIGHT    1
  45 #define LDLM_MODE_JOIN_LEFT     (1 << 1)
  46 #define LDLM_POLICY_JOIN_RIGHT  (1 << 2)
  47 #define LDLM_POLICY_JOIN_LEFT   (1 << 3)
  48
  49 /* lock types */
  50 char *ldlm_lockname[] = {
  51         [0] "--",
  52         [LCK_EX] "EX",
  53         [LCK_PW] "PW",
  54         [LCK_PR] "PR",
  55         [LCK_CW] "CW",
  56         [LCK_CR] "CR",
  57         [LCK_NL] "NL",
  58         [LCK_GROUP] "GROUP"
  59 };
  60
  61 char *ldlm_typename[] = {
  62         [LDLM_PLAIN] "PLN",
  63         [LDLM_EXTENT] "EXT",
  64         [LDLM_FLOCK] "FLK",
  65         [LDLM_IBITS] "IBT",
  66 };
  67
  68 char *ldlm_it2str(int it)
  69 {
  70         switch (it) {
  71         case IT_OPEN:
  72                 return "open";
  73         case IT_CREAT:
  74                 return "creat";
  75         case (IT_OPEN | IT_CREAT):
  76                 return "open|creat";
  77         case IT_READDIR:
  78                 return "readdir";
  79         case IT_GETATTR:
  80                 return "getattr";
  81         case IT_LOOKUP:
  82                 return "lookup";
  83         case IT_UNLINK:
  84                 return "unlink";
  85         case IT_GETXATTR:
  86                 return "getxattr";
  87         default:
  88                 CERROR("Unknown intent %d\n", it);
  89                 return "UNKNOWN";
  90         }
  91 }
  92
  93 extern cfs_mem_cache_t *ldlm_lock_slab;
  94
  95 static ldlm_processing_policy ldlm_processing_policy_table[] = {
  96         [LDLM_PLAIN] ldlm_process_plain_lock,
  97         [LDLM_EXTENT] ldlm_process_extent_lock,
  98 #ifdef __KERNEL__
  99         [LDLM_FLOCK] ldlm_process_flock_lock,
 100 #endif
 101         [LDLM_IBITS] ldlm_process_inodebits_lock,
 102 };
 103
 104 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
 105 {
 106         return ldlm_processing_policy_table[res->lr_type];
 107 }
 108
 109 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
 110 {
 111         ns->ns_policy = arg;
 112 }
 113
 114 /*
 115  * REFCOUNTED LOCK OBJECTS
 116  */
 117
 118
 119 /*
 120  * Lock refcounts, during creation:
 121  *   - one special one for allocation, dec'd only once in destroy
 122  *   - one for being a lock that's in-use
 123  *   - one for the addref associated with a new lock
 124  */
 125 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
 126 {
 127         atomic_inc(&lock->l_refc);
 128         return lock;
 129 }
 130
 131 static void ldlm_lock_free(struct ldlm_lock *lock, size_t size)
 132 {
 133         LASSERT(size == sizeof(*lock));
 134         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
 135 }
 136
 137 void ldlm_lock_put(struct ldlm_lock *lock)
 138 {
 139         ENTRY;
 140
 141         LASSERT(lock->l_resource != LP_POISON);
 142         LASSERT(atomic_read(&lock->l_refc) > 0);
 143         if (atomic_dec_and_test(&lock->l_refc)) {
 144                 struct ldlm_resource *res;
 145
 146                 LDLM_DEBUG(lock, "final lock_put on destroyed lock, freeing it.");
 147
 148                 res = lock->l_resource;
 149                 LASSERT(lock->l_destroyed);
 150                 LASSERT(list_empty(&lock->l_res_link));
 151                 LASSERT(list_empty(&lock->l_pending_chain));
 152
 153                 atomic_dec(&res->lr_namespace->ns_locks);
 154                 ldlm_resource_putref(res);
 155                 lock->l_resource = NULL;
 156                 if (lock->l_export) {
 157                         class_export_put(lock->l_export);
 158                         lock->l_export = NULL;
 159                 }
 160
 161                 if (lock->l_lvb_data != NULL)
 162                         OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
 163
 164                 OBD_FREE_RCU_CB(lock, sizeof(*lock), &lock->l_handle,
 165                                 ldlm_lock_free);
 166         }
 167
 168         EXIT;
 169 }
 170
 171 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
 172 {
 173         int rc = 0;
 174         if (!list_empty(&lock->l_lru)) {
 175                 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 176                 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 177                 list_del_init(&lock->l_lru);
 178                 ns->ns_nr_unused--;
 179                 LASSERT(ns->ns_nr_unused >= 0);
 180                 rc = 1;
 181         }
 182         return rc;
 183 }
 184
 185 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
 186 {
 187         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 188         int rc;
 189         ENTRY;
 190         spin_lock(&ns->ns_unused_lock);
 191         rc = ldlm_lock_remove_from_lru_nolock(lock);
 192         spin_unlock(&ns->ns_unused_lock);
 193         EXIT;
 194         return rc;
 195 }
 196
 197 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
 198 {
 199         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 200         lock->l_last_used = cfs_time_current();
 201         LASSERT(list_empty(&lock->l_lru));
 202         list_add_tail(&lock->l_lru, &ns->ns_unused_list);
 203         LASSERT(ns->ns_nr_unused >= 0);
 204         ns->ns_nr_unused++;
 205 }
 206
 207 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
 208 {
 209         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 210         ENTRY;
 211         spin_lock(&ns->ns_unused_lock);
 212         ldlm_lock_add_to_lru_nolock(lock);
 213         spin_unlock(&ns->ns_unused_lock);
 214         EXIT;
 215 }
 216
 217 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
 218 {
 219         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 220         ENTRY;
 221         spin_lock(&ns->ns_unused_lock);
 222         if (!list_empty(&lock->l_lru)) {
 223                 ldlm_lock_remove_from_lru_nolock(lock);
 224                 ldlm_lock_add_to_lru_nolock(lock);
 225         }
 226         spin_unlock(&ns->ns_unused_lock);
 227         EXIT;
 228 }
 229
 230 /* This used to have a 'strict' flag, which recovery would use to mark an
 231  * in-use lock as needing-to-die.  Lest I am ever tempted to put it back, I
 232  * shall explain why it's gone: with the new hash table scheme, once you call
 233  * ldlm_lock_destroy, you can never drop your final references on this lock.
 234  * Because it's not in the hash table anymore.  -phil */
 235 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
 236 {
 237         ENTRY;
 238
 239         if (lock->l_readers || lock->l_writers) {
 240                 LDLM_ERROR(lock, "lock still has references");
 241                 ldlm_lock_dump(D_ERROR, lock, 0);
 242                 LBUG();
 243         }
 244
 245         if (!list_empty(&lock->l_res_link)) {
 246                 LDLM_ERROR(lock, "lock still on resource");
 247                 ldlm_lock_dump(D_ERROR, lock, 0);
 248                 LBUG();
 249         }
 250
 251         if (lock->l_destroyed) {
 252                 LASSERT(list_empty(&lock->l_lru));
 253                 EXIT;
 254                 return 0;
 255         }
 256         lock->l_destroyed = 1;
 257
 258         if (lock->l_export)
 259                 spin_lock(&lock->l_export->exp_ldlm_data.led_lock);
 260         list_del_init(&lock->l_export_chain);
 261         if (lock->l_export)
 262                 spin_unlock(&lock->l_export->exp_ldlm_data.led_lock);
 263
 264         ldlm_lock_remove_from_lru(lock);
 265         class_handle_unhash(&lock->l_handle);
 266
 267 #if 0
 268         /* Wake anyone waiting for this lock */
 269         /* FIXME: I should probably add yet another flag, instead of using
 270          * l_export to only call this on clients */
 271         if (lock->l_export)
 272                 class_export_put(lock->l_export);
 273         lock->l_export = NULL;
 274         if (lock->l_export && lock->l_completion_ast)
 275                 lock->l_completion_ast(lock, 0);
 276 #endif
 277         EXIT;
 278         return 1;
 279 }
 280
 281 void ldlm_lock_destroy(struct ldlm_lock *lock)
 282 {
 283         int first;
 284         ENTRY;
 285         lock_res_and_lock(lock);
 286         first = ldlm_lock_destroy_internal(lock);
 287         unlock_res_and_lock(lock);
 288
 289         /* drop reference from hashtable only for first destroy */
 290         if (first)
 291                 LDLM_LOCK_PUT(lock);
 292         EXIT;
 293 }
 294
 295 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
 296 {
 297         int first;
 298         ENTRY;
 299         first = ldlm_lock_destroy_internal(lock);
 300         /* drop reference from hashtable only for first destroy */
 301         if (first)
 302                 LDLM_LOCK_PUT(lock);
 303         EXIT;
 304 }
 305
 306 /* this is called by portals_handle2object with the handle lock taken */
 307 static void lock_handle_addref(void *lock)
 308 {
 309         LDLM_LOCK_GET((struct ldlm_lock *)lock);
 310 }
 311
 312 /*
 313  * usage: pass in a resource on which you have done ldlm_resource_get
 314  *        pass in a parent lock on which you have done a ldlm_lock_get
 315  *        after return, ldlm_*_put the resource and parent
 316  * returns: lock with refcount 2 - one for current caller and one for remote
 317  */
 318 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
 319 {
 320         struct ldlm_lock *lock;
 321         ENTRY;
 322
 323         if (resource == NULL)
 324                 LBUG();
 325
 326         OBD_SLAB_ALLOC(lock, ldlm_lock_slab, CFS_ALLOC_IO, sizeof(*lock));
 327         if (lock == NULL)
 328                 RETURN(NULL);
 329
 330         spin_lock_init(&lock->l_lock);
 331         lock->l_resource = ldlm_resource_getref(resource);
 332
 333         atomic_set(&lock->l_refc, 2);
 334         CFS_INIT_LIST_HEAD(&lock->l_res_link);
 335         CFS_INIT_LIST_HEAD(&lock->l_lru);
 336         CFS_INIT_LIST_HEAD(&lock->l_export_chain);
 337         CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
 338         CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
 339         CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
 340         cfs_waitq_init(&lock->l_waitq);
 341         lock->l_blocking_lock = NULL;
 342         lock->l_sl_mode.prev = NULL;
 343         lock->l_sl_mode.next = NULL;
 344         lock->l_sl_policy.prev = NULL;
 345         lock->l_sl_policy.next = NULL;
 346
 347         atomic_inc(&resource->lr_namespace->ns_locks);
 348         CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
 349         class_handle_hash(&lock->l_handle, lock_handle_addref);
 350
 351         RETURN(lock);
 352 }
 353
 354 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
 355                               struct ldlm_res_id new_resid)
 356 {
 357         struct ldlm_resource *oldres = lock->l_resource;
 358         struct ldlm_resource *newres;
 359         int type;
 360         ENTRY;
 361
 362         LASSERT(ns->ns_client != 0);
 363
 364         lock_res_and_lock(lock);
 365         if (memcmp(&new_resid, &lock->l_resource->lr_name,
 366                    sizeof(lock->l_resource->lr_name)) == 0) {
 367                 /* Nothing to do */
 368                 unlock_res_and_lock(lock);
 369                 RETURN(0);
 370         }
 371
 372         LASSERT(new_resid.name[0] != 0);
 373
 374         /* This function assumes that the lock isn't on any lists */
 375         LASSERT(list_empty(&lock->l_res_link));
 376
 377         type = oldres->lr_type;
 378         unlock_res_and_lock(lock);
 379
 380         newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
 381         if (newres == NULL) {
 382                 LBUG();
 383                 RETURN(-ENOMEM);
 384         }
 385
 386         lock_res_and_lock(lock);
 387         LASSERT(memcmp(&new_resid, &lock->l_resource->lr_name,
 388                        sizeof(lock->l_resource->lr_name)) != 0);
 389         lock_res(newres);
 390         lock->l_resource = newres;
 391         unlock_res(oldres);
 392         unlock_res_and_lock(lock);
 393
 394         /* ...and the flowers are still standing! */
 395         ldlm_resource_putref(oldres);
 396
 397         RETURN(0);
 398 }
 399
 400 /*
 401  *  HANDLES
 402  */
 403
 404 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh)
 405 {
 406         lockh->cookie = lock->l_handle.h_cookie;
 407 }
 408
 409 /* if flags: atomically get the lock and set the flags.
 410  *           Return NULL if flag already set
 411  */
 412
 413 struct ldlm_lock *__ldlm_handle2lock(struct lustre_handle *handle, int flags)
 414 {
 415         struct ldlm_namespace *ns;
 416         struct ldlm_lock *lock = NULL, *retval = NULL;
 417         ENTRY;
 418
 419         LASSERT(handle);
 420
 421         lock = class_handle2object(handle->cookie);
 422         if (lock == NULL)
 423                 RETURN(NULL);
 424
 425         LASSERT(lock->l_resource != NULL);
 426         ns = lock->l_resource->lr_namespace;
 427         LASSERT(ns != NULL);
 428
 429         lock_res_and_lock(lock);
 430
 431         /* It's unlikely but possible that someone marked the lock as
 432          * destroyed after we did handle2object on it */
 433         if (lock->l_destroyed) {
 434                 unlock_res_and_lock(lock);
 435                 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
 436                 LDLM_LOCK_PUT(lock);
 437                 GOTO(out, retval);
 438         }
 439
 440         if (flags && (lock->l_flags & flags)) {
 441                 unlock_res_and_lock(lock);
 442                 LDLM_LOCK_PUT(lock);
 443                 GOTO(out, retval);
 444         }
 445
 446         if (flags)
 447                 lock->l_flags |= flags;
 448
 449         unlock_res_and_lock(lock);
 450         retval = lock;
 451         EXIT;
 452  out:
 453         return retval;
 454 }
 455
 456 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *ns,
 457                                       struct lustre_handle *handle)
 458 {
 459         struct ldlm_lock *retval = NULL;
 460         retval = __ldlm_handle2lock(handle, 0);
 461         return retval;
 462 }
 463
 464 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 465 {
 466         struct obd_export *exp = lock->l_export?:lock->l_conn_export;
 467         /* INODEBITS_INTEROP: If the other side does not support
 468          * inodebits, reply with a plain lock descriptor.
 469          */
 470         if ((lock->l_resource->lr_type == LDLM_IBITS) &&
 471             (exp && !(exp->exp_connect_flags & OBD_CONNECT_IBITS))) {
 472                 struct ldlm_resource res = *lock->l_resource;
 473
 474                 /* Make sure all the right bits are set in this lock we
 475                    are going to pass to client */
 476                 LASSERTF(lock->l_policy_data.l_inodebits.bits ==
 477                          (MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE),
 478                          "Inappropriate inode lock bits during "
 479                          "conversion " LPU64 "\n",
 480                          lock->l_policy_data.l_inodebits.bits);
 481                 res.lr_type = LDLM_PLAIN;
 482                 ldlm_res2desc(&res, &desc->l_resource);
 483                 /* Convert "new" lock mode to something old client can
 484                    understand */
 485                 if ((lock->l_req_mode == LCK_CR) ||
 486                     (lock->l_req_mode == LCK_CW))
 487                         desc->l_req_mode = LCK_PR;
 488                 else
 489                         desc->l_req_mode = lock->l_req_mode;
 490                 if ((lock->l_granted_mode == LCK_CR) ||
 491                     (lock->l_granted_mode == LCK_CW)) {
 492                         desc->l_granted_mode = LCK_PR;
 493                 } else {
 494                         /* We never grant PW/EX locks to clients */
 495                         LASSERT((lock->l_granted_mode != LCK_PW) &&
 496                                 (lock->l_granted_mode != LCK_EX));
 497                         desc->l_granted_mode = lock->l_granted_mode;
 498                 }
 499
 500                 /* We do not copy policy here, because there is no
 501                    policy for plain locks */
 502         } else {
 503                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 504                 desc->l_req_mode = lock->l_req_mode;
 505                 desc->l_granted_mode = lock->l_granted_mode;
 506                 desc->l_policy_data = lock->l_policy_data;
 507         }
 508 }
 509
 510 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 511                            struct list_head *work_list)
 512 {
 513         if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
 514                 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
 515                 lock->l_flags |= LDLM_FL_AST_SENT;
 516                 /* If the enqueuing client said so, tell the AST recipient to
 517                  * discard dirty data, rather than writing back. */
 518                 if (new->l_flags & LDLM_AST_DISCARD_DATA)
 519                         lock->l_flags |= LDLM_FL_DISCARD_DATA;
 520                 LASSERT(list_empty(&lock->l_bl_ast));
 521                 list_add(&lock->l_bl_ast, work_list);
 522                 LDLM_LOCK_GET(lock);
 523                 LASSERT(lock->l_blocking_lock == NULL);
 524                 lock->l_blocking_lock = LDLM_LOCK_GET(new);
 525         }
 526 }
 527
 528 void ldlm_add_cp_work_item(struct ldlm_lock *lock, struct list_head *work_list)
 529 {
 530         if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
 531                 lock->l_flags |= LDLM_FL_CP_REQD;
 532                 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
 533                 LASSERT(list_empty(&lock->l_cp_ast));
 534                 list_add(&lock->l_cp_ast, work_list);
 535                 LDLM_LOCK_GET(lock);
 536         }
 537 }
 538
 539 /* must be called with lr_lock held */
 540 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 541                                 struct list_head *work_list)
 542 {
 543         ENTRY;
 544         check_res_locked(lock->l_resource);
 545         if (new)
 546                 ldlm_add_bl_work_item(lock, new, work_list);
 547         else
 548                 ldlm_add_cp_work_item(lock, work_list);
 549         EXIT;
 550 }
 551
 552 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
 553 {
 554         struct ldlm_lock *lock;
 555
 556         lock = ldlm_handle2lock(lockh);
 557         LASSERT(lock != NULL);
 558         ldlm_lock_addref_internal(lock, mode);
 559         LDLM_LOCK_PUT(lock);
 560 }
 561
 562 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 563 {
 564         ldlm_lock_remove_from_lru(lock);
 565         if (mode & (LCK_NL | LCK_CR | LCK_PR))
 566                 lock->l_readers++;
 567         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP))
 568                 lock->l_writers++;
 569         LDLM_LOCK_GET(lock);
 570         LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
 571 }
 572
 573 /* only called for local locks */
 574 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
 575 {
 576         lock_res_and_lock(lock);
 577         ldlm_lock_addref_internal_nolock(lock, mode);
 578         unlock_res_and_lock(lock);
 579 }
 580
 581 /* only called in ldlm_flock_destroy and for local locks.
 582  * for LDLM_FLOCK type locks, l_blocking_ast is null, and
 583  * ldlm_lock_remove_from_lru() does nothing, it is safe
 584  * for ldlm_flock_destroy usage by dropping some code */
 585 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 586 {
 587         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 588         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 589                 LASSERT(lock->l_readers > 0);
 590                 lock->l_readers--;
 591         }
 592         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP)) {
 593                 LASSERT(lock->l_writers > 0);
 594                 lock->l_writers--;
 595         }
 596
 597         LDLM_LOCK_PUT(lock);    /* matches the ldlm_lock_get in addref */
 598 }
 599
 600 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
 601 {
 602         struct ldlm_namespace *ns;
 603         ENTRY;
 604
 605         lock_res_and_lock(lock);
 606
 607         ns = lock->l_resource->lr_namespace;
 608
 609         ldlm_lock_decref_internal_nolock(lock, mode);
 610
 611         if (lock->l_flags & LDLM_FL_LOCAL &&
 612             !lock->l_readers && !lock->l_writers) {
 613                 /* If this is a local lock on a server namespace and this was
 614                  * the last reference, cancel the lock. */
 615                 CDEBUG(D_INFO, "forcing cancel of local lock\n");
 616                 lock->l_flags |= LDLM_FL_CBPENDING;
 617         }
 618
 619         if (!lock->l_readers && !lock->l_writers &&
 620             (lock->l_flags & LDLM_FL_CBPENDING)) {
 621                 /* If we received a blocked AST and this was the last reference,
 622                  * run the callback. */
 623                 if (ns->ns_client == LDLM_NAMESPACE_SERVER && lock->l_export)
 624                         CERROR("FL_CBPENDING set on non-local lock--just a "
 625                                "warning\n");
 626
 627                 LDLM_DEBUG(lock, "final decref done on cbpending lock");
 628
 629                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 630                 ldlm_lock_remove_from_lru(lock);
 631                 unlock_res_and_lock(lock);
 632                 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
 633                     ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
 634                         ldlm_handle_bl_callback(ns, NULL, lock);
 635         } else if (ns->ns_client == LDLM_NAMESPACE_CLIENT &&
 636                    !lock->l_readers && !lock->l_writers &&
 637                    !(lock->l_flags & LDLM_FL_NO_LRU)) {
 638                 /* If this is a client-side namespace and this was the last
 639                  * reference, put it on the LRU. */
 640                 ldlm_lock_add_to_lru(lock);
 641                 unlock_res_and_lock(lock);
 642                 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
 643                  * are not supported by the server, otherwise, it is done on
 644                  * enqueue. */
 645                 if (!exp_connect_cancelset(lock->l_conn_export) &&
 646                     !exp_connect_lru_resize(lock->l_conn_export))
 647                         ldlm_cancel_lru(ns, 0, LDLM_ASYNC);
 648         } else {
 649                 unlock_res_and_lock(lock);
 650         }
 651
 652         EXIT;
 653 }
 654
 655 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
 656 {
 657         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 658         LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
 659         ldlm_lock_decref_internal(lock, mode);
 660         LDLM_LOCK_PUT(lock);
 661 }
 662
 663 /* This will drop a lock reference and mark it for destruction, but will not
 664  * necessarily cancel the lock before returning. */
 665 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
 666 {
 667         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 668         ENTRY;
 669
 670         LASSERT(lock != NULL);
 671
 672         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 673         lock_res_and_lock(lock);
 674         lock->l_flags |= LDLM_FL_CBPENDING;
 675         unlock_res_and_lock(lock);
 676         ldlm_lock_decref_internal(lock, mode);
 677         LDLM_LOCK_PUT(lock);
 678 }
 679
 680 /*
 681  * search_granted_lock
 682  *
 683  * Description:
 684  *      Finds a position to insert the new lock.
 685  * Parameters:
 686  *      queue [input]:  the granted list where search acts on;
 687  *      req [input]:    the lock whose position to be located;
 688  *      lockp [output]: the position where the lock should be inserted before, or
 689  *                      NULL indicating @req should be appended to @queue.
 690  * Return Values:
 691  *      Bit-masks combination of following values indicating in which way the
 692  *      lock need to be inserted.
 693  *      - LDLM_JOIN_NONE:       noting about skip list needs to be fixed;
 694  *      - LDLM_MODE_JOIN_RIGHT: @req needs join right becoming the head of a
 695  *                              mode group;
 696  *      - LDLM_POLICY_JOIN_RIGHT: @req needs join right becoming the head of
 697  *                                a policy group.
 698  * NOTE: called by
 699  *  - ldlm_grant_lock_with_skiplist
 700  */
 701 static int search_granted_lock(struct list_head *queue,
 702                         struct ldlm_lock *req,
 703                         struct ldlm_lock **lockp)
 704 {
 705         struct list_head *tmp, *tmp_tail;
 706         struct ldlm_lock *lock, *mode_head_lock;
 707         int rc = LDLM_JOIN_NONE;
 708         ENTRY;
 709
 710         list_for_each(tmp, queue) {
 711                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 712
 713                 if (lock->l_req_mode != req->l_req_mode) {
 714                         if (LDLM_SL_HEAD(&lock->l_sl_mode))
 715                                 tmp = &list_entry(lock->l_sl_mode.next,
 716                                                   struct ldlm_lock,
 717                                                   l_sl_mode)->l_res_link;
 718                         continue;
 719                 }
 720
 721                 /* found the same mode group */
 722                 if (lock->l_resource->lr_type == LDLM_PLAIN) {
 723                         *lockp = lock;
 724                         rc = LDLM_MODE_JOIN_RIGHT;
 725                         GOTO(out, rc);
 726                 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
 727                         tmp_tail = tmp;
 728                         if (LDLM_SL_HEAD(&lock->l_sl_mode))
 729                                 tmp_tail = &list_entry(lock->l_sl_mode.next,
 730                                                        struct ldlm_lock,
 731                                                        l_sl_mode)->l_res_link;
 732                         mode_head_lock = lock;
 733                         for (;;) {
 734                                 if (lock->l_policy_data.l_inodebits.bits ==
 735                                     req->l_policy_data.l_inodebits.bits) {
 736                                         /* matched policy lock is found */
 737                                         *lockp = lock;
 738                                         rc |= LDLM_POLICY_JOIN_RIGHT;
 739
 740                                         /* if the policy group head is also a
 741                                          * mode group head or a single mode
 742                                          * group lock */
 743                                         if (LDLM_SL_HEAD(&lock->l_sl_mode) ||
 744                                             (tmp == tmp_tail &&
 745                                              LDLM_SL_EMPTY(&lock->l_sl_mode)))
 746                                                 rc |= LDLM_MODE_JOIN_RIGHT;
 747                                         GOTO(out, rc);
 748                                 }
 749
 750                                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
 751                                         tmp = &list_entry(lock->l_sl_policy.next,
 752                                                           struct ldlm_lock,
 753                                                           l_sl_policy)->l_res_link;
 754
 755                                 if (tmp == tmp_tail)
 756                                         break;
 757                                 else
 758                                         tmp = tmp->next;
 759                                 lock = list_entry(tmp, struct ldlm_lock,
 760                                                   l_res_link);
 761                         }  /* for all locks in the matched mode group */
 762
 763                         /* no matched policy group is found, insert before
 764                          * the mode group head lock */
 765                         *lockp = mode_head_lock;
 766                         rc = LDLM_MODE_JOIN_RIGHT;
 767                         GOTO(out, rc);
 768                 } else {
 769                         LDLM_ERROR(lock, "is not LDLM_PLAIN or LDLM_IBITS lock");
 770                         LBUG();
 771                 }
 772         }
 773
 774         /* no matched mode group is found, append to the end */
 775         *lockp = NULL;
 776         rc = LDLM_JOIN_NONE;
 777         EXIT;
 778 out:
 779         return rc;
 780 }
 781
 782 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
 783                                        struct ldlm_lock *lockp,
 784                                        int join)
 785 {
 786         struct ldlm_resource *res = lock->l_resource;
 787         ENTRY;
 788
 789         LASSERT(lockp || join == LDLM_JOIN_NONE);
 790
 791         check_res_locked(res);
 792
 793         ldlm_resource_dump(D_OTHER, res);
 794         CDEBUG(D_OTHER, "About to add this lock:\n");
 795         ldlm_lock_dump(D_OTHER, lock, 0);
 796
 797         if (lock->l_destroyed) {
 798                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
 799                 return;
 800         }
 801
 802         LASSERT(list_empty(&lock->l_res_link));
 803
 804         if (!lockp)
 805                 list_add_tail(&lock->l_res_link, &lock->l_resource->lr_granted);
 806         else if ((join & LDLM_MODE_JOIN_LEFT) || (join & LDLM_POLICY_JOIN_LEFT))
 807                 list_add(&lock->l_res_link, &lockp->l_res_link);
 808         else
 809                 list_add_tail(&lock->l_res_link, &lockp->l_res_link);
 810
 811         /* fix skip lists */
 812         if (join & LDLM_MODE_JOIN_RIGHT) {
 813                 LASSERT(! LDLM_SL_TAIL(&lockp->l_sl_mode));
 814                 if (LDLM_SL_EMPTY(&lockp->l_sl_mode)) {
 815                         lock->l_sl_mode.next = &lockp->l_sl_mode;
 816                         lockp->l_sl_mode.prev = &lock->l_sl_mode;
 817                 } else if (LDLM_SL_HEAD(&lockp->l_sl_mode)) {
 818                         lock->l_sl_mode.next = lockp->l_sl_mode.next;
 819                         lockp->l_sl_mode.next = NULL;
 820                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
 821                 }
 822         } else if (join & LDLM_MODE_JOIN_LEFT) {
 823                 LASSERT(! LDLM_SL_HEAD(&lockp->l_sl_mode));
 824                 if (LDLM_SL_EMPTY(&lockp->l_sl_mode)) {
 825                         lock->l_sl_mode.prev = &lockp->l_sl_mode;
 826                         lockp->l_sl_mode.next = &lock->l_sl_mode;
 827                 } else if (LDLM_SL_TAIL(&lockp->l_sl_mode)) {
 828                         lock->l_sl_mode.prev = lockp->l_sl_mode.prev;
 829                         lockp->l_sl_mode.prev = NULL;
 830                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
 831                 }
 832         }
 833
 834         if (join & LDLM_POLICY_JOIN_RIGHT) {
 835                 LASSERT(! LDLM_SL_TAIL(&lockp->l_sl_policy));
 836                 if (LDLM_SL_EMPTY(&lockp->l_sl_policy)) {
 837                         lock->l_sl_policy.next = &lockp->l_sl_policy;
 838                         lockp->l_sl_policy.prev = &lock->l_sl_policy;
 839                 } else if (LDLM_SL_HEAD(&lockp->l_sl_policy)) {
 840                         lock->l_sl_policy.next = lockp->l_sl_policy.next;
 841                         lockp->l_sl_policy.next = NULL;
 842                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
 843                 }
 844         } else if (join & LDLM_POLICY_JOIN_LEFT) {
 845                 LASSERT(! LDLM_SL_HEAD(&lockp->l_sl_policy));
 846                 if (LDLM_SL_EMPTY(&lockp->l_sl_policy)) {
 847                         lock->l_sl_policy.prev = &lockp->l_sl_policy;
 848                         lockp->l_sl_policy.next = &lock->l_sl_policy;
 849                 } else if (LDLM_SL_TAIL(&lockp->l_sl_policy)) {
 850                         lock->l_sl_policy.prev = lockp->l_sl_policy.prev;
 851                         lockp->l_sl_policy.prev = NULL;
 852                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
 853                 }
 854         }
 855
 856         EXIT;
 857 }
 858
 859 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
 860 {
 861         int join = LDLM_JOIN_NONE;
 862         struct ldlm_lock *lockp = NULL;
 863         ENTRY;
 864
 865         LASSERT(lock->l_req_mode == lock->l_granted_mode);
 866
 867         join = search_granted_lock(&lock->l_resource->lr_granted, lock, &lockp);
 868         ldlm_granted_list_add_lock(lock, lockp, join);
 869         EXIT;
 870 }
 871
 872 /* NOTE: called by
 873  *  - ldlm_lock_enqueue
 874  *  - ldlm_reprocess_queue
 875  *  - ldlm_lock_convert
 876  *
 877  * must be called with lr_lock held
 878  */
 879 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
 880 {
 881         struct ldlm_resource *res = lock->l_resource;
 882         ENTRY;
 883
 884         check_res_locked(res);
 885
 886         lock->l_granted_mode = lock->l_req_mode;
 887         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
 888                 ldlm_grant_lock_with_skiplist(lock);
 889         else
 890                 ldlm_resource_add_lock(res, &res->lr_granted, lock);
 891
 892         if (lock->l_granted_mode < res->lr_most_restr)
 893                 res->lr_most_restr = lock->l_granted_mode;
 894
 895         if (work_list && lock->l_completion_ast != NULL)
 896                 ldlm_add_ast_work_item(lock, NULL, work_list);
 897
 898         ldlm_pool_add(&res->lr_namespace->ns_pool, lock);
 899         EXIT;
 900 }
 901
 902 /* returns a referenced lock or NULL.  See the flag descriptions below, in the
 903  * comment above ldlm_lock_match */
 904 static struct ldlm_lock *search_queue(struct list_head *queue, ldlm_mode_t mode,
 905                                       ldlm_policy_data_t *policy,
 906                                       struct ldlm_lock *old_lock, int flags)
 907 {
 908         struct ldlm_lock *lock;
 909         struct list_head *tmp;
 910
 911         list_for_each(tmp, queue) {
 912                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 913
 914                 if (lock == old_lock)
 915                         break;
 916
 917                 /* llite sometimes wants to match locks that will be
 918                  * canceled when their users drop, but we allow it to match
 919                  * if it passes in CBPENDING and the lock still has users.
 920                  * this is generally only going to be used by children
 921                  * whose parents already hold a lock so forward progress
 922                  * can still happen. */
 923                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 924                     !(flags & LDLM_FL_CBPENDING))
 925                         continue;
 926                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 927                     lock->l_readers == 0 && lock->l_writers == 0)
 928                         continue;
 929
 930                 if (!(lock->l_req_mode & mode))
 931                         continue;
 932
 933                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 934                     (lock->l_policy_data.l_extent.start >
 935                      policy->l_extent.start ||
 936                      lock->l_policy_data.l_extent.end < policy->l_extent.end))
 937                         continue;
 938
 939                 if (unlikely(mode == LCK_GROUP) &&
 940                     lock->l_resource->lr_type == LDLM_EXTENT &&
 941                     lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
 942                         continue;
 943
 944                 /* We match if we have existing lock with same or wider set
 945                    of bits. */
 946                 if (lock->l_resource->lr_type == LDLM_IBITS &&
 947                      ((lock->l_policy_data.l_inodebits.bits &
 948                       policy->l_inodebits.bits) !=
 949                       policy->l_inodebits.bits))
 950                         continue;
 951
 952                 if (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED))
 953                         continue;
 954
 955                 if ((flags & LDLM_FL_LOCAL_ONLY) &&
 956                     !(lock->l_flags & LDLM_FL_LOCAL))
 957                         continue;
 958
 959                 if (flags & LDLM_FL_TEST_LOCK) {
 960                         LDLM_LOCK_GET(lock);
 961                         ldlm_lock_touch_in_lru(lock);
 962                 } else {
 963                         ldlm_lock_addref_internal_nolock(lock, mode);
 964                 }
 965                 return lock;
 966         }
 967
 968         return NULL;
 969 }
 970
 971 void ldlm_lock_allow_match(struct ldlm_lock *lock)
 972 {
 973         lock_res_and_lock(lock);
 974         lock->l_flags |= LDLM_FL_LVB_READY;
 975         cfs_waitq_signal(&lock->l_waitq);
 976         unlock_res_and_lock(lock);
 977 }
 978
 979 /* Can be called in two ways:
 980  *
 981  * If 'ns' is NULL, then lockh describes an existing lock that we want to look
 982  * for a duplicate of.
 983  *
 984  * Otherwise, all of the fields must be filled in, to match against.
 985  *
 986  * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
 987  *     server (ie, connh is NULL)
 988  * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
 989  *     list will be considered
 990  * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
 991  *     to be canceled can still be matched as long as they still have reader
 992  *     or writer refernces
 993  * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
 994  *     just tell us if we would have matched.
 995  *
 996  * Returns 1 if it finds an already-existing lock that is compatible; in this
 997  * case, lockh is filled in with a addref()ed lock
 998  */
 999 int ldlm_lock_match(struct ldlm_namespace *ns, int flags,
1000                     struct ldlm_res_id *res_id, ldlm_type_t type,
1001                     ldlm_policy_data_t *policy, ldlm_mode_t mode,
1002                     struct lustre_handle *lockh)
1003 {
1004         struct ldlm_resource *res;
1005         struct ldlm_lock *lock, *old_lock = NULL;
1006         int rc = 0;
1007         ENTRY;
1008
1009         if (ns == NULL) {
1010                 old_lock = ldlm_handle2lock(lockh);
1011                 LASSERT(old_lock);
1012
1013                 ns = old_lock->l_resource->lr_namespace;
1014                 res_id = &old_lock->l_resource->lr_name;
1015                 type = old_lock->l_resource->lr_type;
1016                 mode = old_lock->l_req_mode;
1017         }
1018
1019         res = ldlm_resource_get(ns, NULL, *res_id, type, 0);
1020         if (res == NULL) {
1021                 LASSERT(old_lock == NULL);
1022                 RETURN(0);
1023         }
1024
1025         lock_res(res);
1026
1027         lock = search_queue(&res->lr_granted, mode, policy, old_lock, flags);
1028         if (lock != NULL)
1029                 GOTO(out, rc = 1);
1030         if (flags & LDLM_FL_BLOCK_GRANTED)
1031                 GOTO(out, rc = 0);
1032         lock = search_queue(&res->lr_converting, mode, policy, old_lock, flags);
1033         if (lock != NULL)
1034                 GOTO(out, rc = 1);
1035         lock = search_queue(&res->lr_waiting, mode, policy, old_lock, flags);
1036         if (lock != NULL)
1037                 GOTO(out, rc = 1);
1038
1039         EXIT;
1040  out:
1041         unlock_res(res);
1042         ldlm_resource_putref(res);
1043
1044         if (lock) {
1045                 ldlm_lock2handle(lock, lockh);
1046                 if ((flags & LDLM_FL_LVB_READY) && (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1047                         struct l_wait_info lwi;
1048                         if (lock->l_completion_ast) {
1049                                 int err = lock->l_completion_ast(lock,
1050                                                           LDLM_FL_WAIT_NOREPROC,
1051                                                                  NULL);
1052                                 if (err) {
1053                                         if (flags & LDLM_FL_TEST_LOCK)
1054                                                 LDLM_LOCK_PUT(lock);
1055                                         else
1056                                                 ldlm_lock_decref_internal(lock, mode);
1057                                         rc = 0;
1058                                         goto out2;
1059                                 }
1060                         }
1061
1062                         lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout), NULL,
1063                                                LWI_ON_SIGNAL_NOOP, NULL);
1064
1065                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1066                         l_wait_event(lock->l_waitq,
1067                                      (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1068                 }
1069         }
1070  out2:
1071         if (rc) {
1072                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1073                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1074                                 res_id->name[2] : policy->l_extent.start,
1075                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1076                                 res_id->name[3] : policy->l_extent.end);
1077         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1078                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1079                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1080                                   type, mode, res_id->name[0], res_id->name[1],
1081                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1082                                         res_id->name[2] :policy->l_extent.start,
1083                                 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1084                                         res_id->name[3] : policy->l_extent.end);
1085         }
1086         if (old_lock)
1087                 LDLM_LOCK_PUT(old_lock);
1088         if (flags & LDLM_FL_TEST_LOCK && rc)
1089                 LDLM_LOCK_PUT(lock);
1090
1091         return rc;
1092 }
1093
1094 /* Returns a referenced lock */
1095 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1096                                    struct ldlm_res_id res_id, ldlm_type_t type,
1097                                    ldlm_mode_t mode,
1098                                    ldlm_blocking_callback blocking,
1099                                    ldlm_completion_callback completion,
1100                                    ldlm_glimpse_callback glimpse,
1101                                    void *data, __u32 lvb_len)
1102 {
1103         struct ldlm_lock *lock;
1104         struct ldlm_resource *res;
1105         ENTRY;
1106
1107         res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1108         if (res == NULL)
1109                 RETURN(NULL);
1110
1111         lock = ldlm_lock_new(res);
1112         ldlm_resource_putref(res);
1113
1114         if (lock == NULL)
1115                 RETURN(NULL);
1116
1117         lock->l_req_mode = mode;
1118         lock->l_ast_data = data;
1119         lock->l_blocking_ast = blocking;
1120         lock->l_completion_ast = completion;
1121         lock->l_glimpse_ast = glimpse;
1122         lock->l_pid = cfs_curproc_pid();
1123
1124         if (lvb_len) {
1125                 lock->l_lvb_len = lvb_len;
1126                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1127                 if (lock->l_lvb_data == NULL) {
1128                         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
1129                         RETURN(NULL);
1130                 }
1131         }
1132
1133         RETURN(lock);
1134 }
1135
1136 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1137                                struct ldlm_lock **lockp,
1138                                void *cookie, int *flags)
1139 {
1140         struct ldlm_lock *lock = *lockp;
1141         struct ldlm_resource *res = lock->l_resource;
1142         int local = res->lr_namespace->ns_client;
1143         ldlm_processing_policy policy;
1144         ldlm_error_t rc = ELDLM_OK;
1145         ENTRY;
1146
1147         do_gettimeofday(&lock->l_enqueued_time);
1148         /* policies are not executed on the client or during replay */
1149         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1150             && !local && ns->ns_policy) {
1151                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1152                                    NULL);
1153                 if (rc == ELDLM_LOCK_REPLACED) {
1154                         /* The lock that was returned has already been granted,
1155                          * and placed into lockp.  If it's not the same as the
1156                          * one we passed in, then destroy the old one and our
1157                          * work here is done. */
1158                         if (lock != *lockp) {
1159                                 ldlm_lock_destroy(lock);
1160                                 LDLM_LOCK_PUT(lock);
1161                         }
1162                         *flags |= LDLM_FL_LOCK_CHANGED;
1163                         RETURN(0);
1164                 } else if (rc != ELDLM_OK ||
1165                            (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1166                         ldlm_lock_destroy(lock);
1167                         RETURN(rc);
1168                 }
1169         }
1170
1171         lock_res_and_lock(lock);
1172         if (local && lock->l_req_mode == lock->l_granted_mode) {
1173                 /* The server returned a blocked lock, but it was granted before
1174                  * we got a chance to actually enqueue it.  We don't need to do
1175                  * anything else. */
1176                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1177                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1178                 GOTO(out, ELDLM_OK);
1179         }
1180
1181         /* Some flags from the enqueue want to make it into the AST, via the
1182          * lock's l_flags. */
1183         lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1184
1185         /* This distinction between local lock trees is very important; a client
1186          * namespace only has information about locks taken by that client, and
1187          * thus doesn't have enough information to decide for itself if it can
1188          * be granted (below).  In this case, we do exactly what the server
1189          * tells us to do, as dictated by the 'flags'.
1190          *
1191          * We do exactly the same thing during recovery, when the server is
1192          * more or less trusting the clients not to lie.
1193          *
1194          * FIXME (bug 268): Detect obvious lies by checking compatibility in
1195          * granted/converting queues. */
1196         ldlm_resource_unlink_lock(lock);
1197         if (local) {
1198                 if (*flags & LDLM_FL_BLOCK_CONV)
1199                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1200                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1201                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1202                 else
1203                         ldlm_grant_lock(lock, NULL);
1204                 GOTO(out, ELDLM_OK);
1205         } else if (*flags & LDLM_FL_REPLAY) {
1206                 if (*flags & LDLM_FL_BLOCK_CONV) {
1207                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1208                         GOTO(out, ELDLM_OK);
1209                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1210                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1211                         GOTO(out, ELDLM_OK);
1212                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1213                         ldlm_grant_lock(lock, NULL);
1214                         GOTO(out, ELDLM_OK);
1215                 }
1216                 /* If no flags, fall through to normal enqueue path. */
1217         }
1218
1219         policy = ldlm_processing_policy_table[res->lr_type];
1220         policy(lock, flags, 1, &rc, NULL);
1221         GOTO(out, rc);
1222 out:
1223         unlock_res_and_lock(lock);
1224         return rc;
1225 }
1226
1227 /* Must be called with namespace taken: queue is waiting or converting. */
1228 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
1229                          struct list_head *work_list)
1230 {
1231         struct list_head *tmp, *pos;
1232         ldlm_processing_policy policy;
1233         int flags;
1234         int rc = LDLM_ITER_CONTINUE;
1235         ldlm_error_t err;
1236         ENTRY;
1237
1238         check_res_locked(res);
1239
1240         policy = ldlm_processing_policy_table[res->lr_type];
1241         LASSERT(policy);
1242
1243         list_for_each_safe(tmp, pos, queue) {
1244                 struct ldlm_lock *pending;
1245                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
1246
1247                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1248
1249                 flags = 0;
1250                 rc = policy(pending, &flags, 0, &err, work_list);
1251                 if (rc != LDLM_ITER_CONTINUE)
1252                         break;
1253         }
1254
1255         RETURN(rc);
1256 }
1257
1258 /* Helper function for pair ldlm_run_{bl,cp}_ast_work().
1259  *
1260  * Send an existing rpc set specified by @arg->set and then
1261  * destroy it. Create new one if @do_create flag is set. */
1262 static void
1263 ldlm_send_and_maybe_create_set(struct ldlm_cb_set_arg *arg, int do_create)
1264 {
1265         int rc;
1266
1267         rc = ptlrpc_set_wait(arg->set);
1268         if (arg->type == LDLM_BL_CALLBACK)
1269                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_GLIMPSE, 2);
1270         ptlrpc_set_destroy(arg->set);
1271
1272         if (do_create)
1273                 arg->set = ptlrpc_prep_set();
1274 }
1275
1276 int ldlm_run_bl_ast_work(struct list_head *rpc_list)
1277 {
1278         struct ldlm_cb_set_arg arg;
1279         struct list_head *tmp, *pos;
1280         struct ldlm_lock_desc d;
1281         int ast_count;
1282         int rc = 0;
1283         ENTRY;
1284
1285         arg.set = ptlrpc_prep_set();
1286         atomic_set(&arg.restart, 0);
1287         arg.type = LDLM_BL_CALLBACK;
1288
1289         ast_count = 0;
1290         list_for_each_safe(tmp, pos, rpc_list) {
1291                 struct ldlm_lock *lock =
1292                         list_entry(tmp, struct ldlm_lock, l_bl_ast);
1293
1294                 /* nobody should touch l_bl_ast */
1295                 lock_res_and_lock(lock);
1296                 list_del_init(&lock->l_bl_ast);
1297
1298                 LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1299                 LASSERT(lock->l_bl_ast_run == 0);
1300                 LASSERT(lock->l_blocking_lock);
1301                 lock->l_bl_ast_run++;
1302                 unlock_res_and_lock(lock);
1303
1304                 ldlm_lock2desc(lock->l_blocking_lock, &d);
1305
1306                 LDLM_LOCK_PUT(lock->l_blocking_lock);
1307                 lock->l_blocking_lock = NULL;
1308                 rc = lock->l_blocking_ast(lock, &d, (void *)&arg,
1309                                           LDLM_CB_BLOCKING);
1310                 LDLM_LOCK_PUT(lock);
1311                 ast_count++;
1312
1313                 /* Send the request set if it exceeds the PARALLEL_AST_LIMIT,
1314                  * and create a new set for requests that remained in
1315                  * @rpc_list */
1316                 if (unlikely(ast_count == PARALLEL_AST_LIMIT)) {
1317                         ldlm_send_and_maybe_create_set(&arg, 1);
1318                         ast_count = 0;
1319                 }
1320         }
1321
1322         if (ast_count > 0)
1323                 ldlm_send_and_maybe_create_set(&arg, 0);
1324         else
1325                 /* In case when number of ASTs is multiply of
1326                  * PARALLEL_AST_LIMIT or @rpc_list was initially empty,
1327                  * @arg.set must be destroyed here, otherwise we get
1328                  * write memory leaking. */
1329                 ptlrpc_set_destroy(arg.set);
1330
1331         RETURN(atomic_read(&arg.restart) ? -ERESTART : 0);
1332 }
1333
1334 int ldlm_run_cp_ast_work(struct list_head *rpc_list)
1335 {
1336         struct ldlm_cb_set_arg arg;
1337         struct list_head *tmp, *pos;
1338         int ast_count;
1339         int rc = 0;
1340         ENTRY;
1341
1342         arg.set = ptlrpc_prep_set();
1343         atomic_set(&arg.restart, 0);
1344         arg.type = LDLM_CP_CALLBACK;
1345
1346         /* It's possible to receive a completion AST before we've set
1347          * the l_completion_ast pointer: either because the AST arrived
1348          * before the reply, or simply because there's a small race
1349          * window between receiving the reply and finishing the local
1350          * enqueue. (bug 842)
1351          *
1352          * This can't happen with the blocking_ast, however, because we
1353          * will never call the local blocking_ast until we drop our
1354          * reader/writer reference, which we won't do until we get the
1355          * reply and finish enqueueing. */
1356
1357         ast_count = 0;
1358         list_for_each_safe(tmp, pos, rpc_list) {
1359                 struct ldlm_lock *lock =
1360                         list_entry(tmp, struct ldlm_lock, l_cp_ast);
1361
1362                 /* nobody should touch l_cp_ast */
1363                 lock_res_and_lock(lock);
1364                 list_del_init(&lock->l_cp_ast);
1365                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1366                 lock->l_flags &= ~LDLM_FL_CP_REQD;
1367                 unlock_res_and_lock(lock);
1368
1369                 if (lock->l_completion_ast != NULL) {
1370                         rc = lock->l_completion_ast(lock, 0, (void *)&arg);
1371                         ast_count++;
1372                 }
1373                 LDLM_LOCK_PUT(lock);
1374
1375                 /* Send the request set if it exceeds the PARALLEL_AST_LIMIT,
1376                  * and create a new set for requests that remained in
1377                  * @rpc_list */
1378                 if (unlikely(ast_count == PARALLEL_AST_LIMIT)) {
1379                         ldlm_send_and_maybe_create_set(&arg, 1);
1380                         ast_count = 0;
1381                 }
1382         }
1383
1384         if (ast_count > 0)
1385                 ldlm_send_and_maybe_create_set(&arg, 0);
1386         else
1387                 /* In case when number of ASTs is multiply of
1388                  * PARALLEL_AST_LIMIT or @rpc_list was initially empty,
1389                  * @arg.set must be destroyed here, otherwise we get
1390                  * write memory leaking. */
1391                 ptlrpc_set_destroy(arg.set);
1392
1393         RETURN(atomic_read(&arg.restart) ? -ERESTART : 0);
1394 }
1395
1396 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1397 {
1398         ldlm_reprocess_all(res);
1399         return LDLM_ITER_CONTINUE;
1400 }
1401
1402 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1403 {
1404         struct list_head *tmp;
1405         int i, rc;
1406
1407         ENTRY;
1408         spin_lock(&ns->ns_hash_lock);
1409         for (i = 0; i < RES_HASH_SIZE; i++) {
1410                 tmp = ns->ns_hash[i].next;
1411                 while (tmp != &(ns->ns_hash[i])) {
1412                         struct ldlm_resource *res =
1413                                 list_entry(tmp, struct ldlm_resource, lr_hash);
1414
1415                         ldlm_resource_getref(res);
1416                         spin_unlock(&ns->ns_hash_lock);
1417
1418                         rc = reprocess_one_queue(res, NULL);
1419
1420                         spin_lock(&ns->ns_hash_lock);
1421                         tmp = tmp->next;
1422                         ldlm_resource_putref_locked(res);
1423
1424                         if (rc == LDLM_ITER_STOP)
1425                                 GOTO(out, rc);
1426                 }
1427         }
1428  out:
1429         spin_unlock(&ns->ns_hash_lock);
1430         EXIT;
1431 }
1432
1433 void ldlm_reprocess_all(struct ldlm_resource *res)
1434 {
1435         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1436         int rc;
1437         ENTRY;
1438
1439         /* Local lock trees don't get reprocessed. */
1440         if (res->lr_namespace->ns_client) {
1441                 EXIT;
1442                 return;
1443         }
1444
1445  restart:
1446         lock_res(res);
1447         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1448         if (rc == LDLM_ITER_CONTINUE)
1449                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1450         unlock_res(res);
1451
1452         rc = ldlm_run_cp_ast_work(&rpc_list);
1453         if (rc == -ERESTART) {
1454                 LASSERT(list_empty(&rpc_list));
1455                 goto restart;
1456         }
1457         EXIT;
1458 }
1459
1460 void ldlm_cancel_callback(struct ldlm_lock *lock)
1461 {
1462         check_res_locked(lock->l_resource);
1463         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1464                 lock->l_flags |= LDLM_FL_CANCEL;
1465                 if (lock->l_blocking_ast) {
1466                         // l_check_no_ns_lock(ns);
1467                         unlock_res_and_lock(lock);
1468                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1469                                              LDLM_CB_CANCELING);
1470                         lock_res_and_lock(lock);
1471                 } else {
1472                         LDLM_DEBUG(lock, "no blocking ast");
1473                 }
1474         }
1475         lock->l_flags |= LDLM_FL_BL_DONE;
1476 }
1477
1478 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1479 {
1480         struct ldlm_lock *lock;
1481
1482         if (req->l_resource->lr_type != LDLM_PLAIN &&
1483             req->l_resource->lr_type != LDLM_IBITS)
1484                 return;
1485
1486         if (LDLM_SL_HEAD(&req->l_sl_mode)) {
1487                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1488                                   l_res_link);
1489                 if (req->l_sl_mode.next == &lock->l_sl_mode) {
1490                         lock->l_sl_mode.prev = NULL;
1491                 } else {
1492                         lock->l_sl_mode.next = req->l_sl_mode.next;
1493                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
1494                 }
1495                 req->l_sl_mode.next = NULL;
1496         } else if (LDLM_SL_TAIL(&req->l_sl_mode)) {
1497                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1498                                   l_res_link);
1499                 if (req->l_sl_mode.prev == &lock->l_sl_mode) {
1500                         lock->l_sl_mode.next = NULL;
1501                 } else {
1502                         lock->l_sl_mode.prev = req->l_sl_mode.prev;
1503                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
1504                 }
1505                 req->l_sl_mode.prev = NULL;
1506         }
1507
1508         if (LDLM_SL_HEAD(&req->l_sl_policy)) {
1509                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1510                                   l_res_link);
1511                 if (req->l_sl_policy.next == &lock->l_sl_policy) {
1512                         lock->l_sl_policy.prev = NULL;
1513                 } else {
1514                         lock->l_sl_policy.next = req->l_sl_policy.next;
1515                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
1516                 }
1517                 req->l_sl_policy.next = NULL;
1518         } else if (LDLM_SL_TAIL(&req->l_sl_policy)) {
1519                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1520                                   l_res_link);
1521                 if (req->l_sl_policy.prev == &lock->l_sl_policy) {
1522                         lock->l_sl_policy.next = NULL;
1523                 } else {
1524                         lock->l_sl_policy.prev = req->l_sl_policy.prev;
1525                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
1526                 }
1527                 req->l_sl_policy.prev = NULL;
1528         }
1529 }
1530
1531 void ldlm_lock_cancel(struct ldlm_lock *lock)
1532 {
1533         struct ldlm_resource *res;
1534         struct ldlm_namespace *ns;
1535         ENTRY;
1536
1537         lock_res_and_lock(lock);
1538
1539         res = lock->l_resource;
1540         ns = res->lr_namespace;
1541
1542         /* Please do not, no matter how tempting, remove this LBUG without
1543          * talking to me first. -phik */
1544         if (lock->l_readers || lock->l_writers) {
1545                 LDLM_ERROR(lock, "lock still has references");
1546                 LBUG();
1547         }
1548
1549         ldlm_del_waiting_lock(lock);
1550
1551         /* Releases res lock */
1552         ldlm_cancel_callback(lock);
1553
1554         /* Yes, second time, just in case it was added again while we were
1555            running with no res lock in ldlm_cancel_callback */
1556         ldlm_del_waiting_lock(lock);
1557         ldlm_resource_unlink_lock(lock);
1558         ldlm_lock_destroy_nolock(lock);
1559
1560         if (lock->l_granted_mode == lock->l_req_mode)
1561                 ldlm_pool_del(&ns->ns_pool, lock);
1562
1563         /* Make sure we will not be called again for same lock what is possible
1564          * if not to zero out lock->l_granted_mode */
1565         lock->l_granted_mode = 0;
1566         unlock_res_and_lock(lock);
1567
1568         EXIT;
1569 }
1570
1571 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1572 {
1573         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1574         ENTRY;
1575
1576         if (lock == NULL)
1577                 RETURN(-EINVAL);
1578
1579         lock->l_ast_data = data;
1580         LDLM_LOCK_PUT(lock);
1581         RETURN(0);
1582 }
1583
1584 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1585 {
1586         struct ldlm_lock *lock;
1587         struct ldlm_resource *res;
1588
1589         spin_lock(&exp->exp_ldlm_data.led_lock);
1590         while(!list_empty(&exp->exp_ldlm_data.led_held_locks)) {
1591                 lock = list_entry(exp->exp_ldlm_data.led_held_locks.next,
1592                                   struct ldlm_lock, l_export_chain);
1593                 res = ldlm_resource_getref(lock->l_resource);
1594                 LDLM_LOCK_GET(lock);
1595                 spin_unlock(&exp->exp_ldlm_data.led_lock);
1596
1597                 LDLM_DEBUG(lock, "export %p", exp);
1598                 ldlm_res_lvbo_update(res, NULL, 0, 1);
1599
1600                 ldlm_lock_cancel(lock);
1601                 ldlm_reprocess_all(res);
1602
1603                 ldlm_resource_putref(res);
1604                 LDLM_LOCK_PUT(lock);
1605                 spin_lock(&exp->exp_ldlm_data.led_lock);
1606         }
1607         spin_unlock(&exp->exp_ldlm_data.led_lock);
1608 }
1609
1610 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1611                                         int *flags)
1612 {
1613         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1614         struct ldlm_resource *res;
1615         struct ldlm_namespace *ns;
1616         int granted = 0;
1617         int old_mode, rc;
1618         struct ldlm_lock *mark_lock = NULL;
1619         int join= LDLM_JOIN_NONE;
1620         ldlm_error_t err;
1621         ENTRY;
1622
1623         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1624                 *flags |= LDLM_FL_BLOCK_GRANTED;
1625                 RETURN(lock->l_resource);
1626         }
1627
1628         LASSERTF(new_mode == LCK_PW && lock->l_granted_mode == LCK_PR,
1629                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1630
1631         lock_res_and_lock(lock);
1632
1633         res = lock->l_resource;
1634         ns = res->lr_namespace;
1635
1636         old_mode = lock->l_req_mode;
1637         lock->l_req_mode = new_mode;
1638         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1639                 /* remember the lock position where the lock might be
1640                  * added back to the granted list later and also
1641                  * remember the join mode for skiplist fixing. */
1642                 if (LDLM_SL_HEAD(&lock->l_sl_mode))
1643                         join = LDLM_MODE_JOIN_RIGHT;
1644                 else if (LDLM_SL_TAIL(&lock->l_sl_mode))
1645                         join = LDLM_MODE_JOIN_LEFT;
1646                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
1647                         join |= LDLM_POLICY_JOIN_RIGHT;
1648                 else if (LDLM_SL_TAIL(&lock->l_sl_policy))
1649                         join |= LDLM_POLICY_JOIN_LEFT;
1650
1651                 LASSERT(!((join & LDLM_MODE_JOIN_RIGHT) &&
1652                           (join & LDLM_POLICY_JOIN_LEFT)));
1653                 LASSERT(!((join & LDLM_MODE_JOIN_LEFT) &&
1654                           (join & LDLM_POLICY_JOIN_RIGHT)));
1655
1656                 if ((join & LDLM_MODE_JOIN_LEFT) ||
1657                     (join & LDLM_POLICY_JOIN_LEFT))
1658                         mark_lock = list_entry(lock->l_res_link.prev,
1659                                                struct ldlm_lock, l_res_link);
1660                 else if (lock->l_res_link.next != &res->lr_granted)
1661                         mark_lock = list_entry(lock->l_res_link.next,
1662                                                struct ldlm_lock, l_res_link);
1663         }
1664         ldlm_resource_unlink_lock(lock);
1665
1666         /* If this is a local resource, put it on the appropriate list. */
1667         if (res->lr_namespace->ns_client) {
1668                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1669                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1670                 } else {
1671                         /* This should never happen, because of the way the
1672                          * server handles conversions. */
1673                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1674                                    *flags);
1675                         LBUG();
1676
1677                         ldlm_grant_lock(lock, &rpc_list);
1678                         granted = 1;
1679                         /* FIXME: completion handling not with ns_lock held ! */
1680                         if (lock->l_completion_ast)
1681                                 lock->l_completion_ast(lock, 0, NULL);
1682                 }
1683         } else {
1684                 int pflags = 0;
1685                 ldlm_processing_policy policy;
1686                 policy = ldlm_processing_policy_table[res->lr_type];
1687                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1688                 if (rc == LDLM_ITER_STOP) {
1689                         lock->l_req_mode = old_mode;
1690                         ldlm_granted_list_add_lock(lock, mark_lock, join);
1691                         res = NULL;
1692                 } else {
1693                         *flags |= LDLM_FL_BLOCK_GRANTED;
1694                         granted = 1;
1695                 }
1696         }
1697         unlock_res_and_lock(lock);
1698
1699         if (granted)
1700                 ldlm_run_cp_ast_work(&rpc_list);
1701         RETURN(res);
1702 }
1703
1704 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1705 {
1706         struct obd_device *obd = NULL;
1707
1708         if (!((libcfs_debug | D_ERROR) & level))
1709                 return;
1710
1711         if (!lock) {
1712                 CDEBUG(level, "  NULL LDLM lock\n");
1713                 return;
1714         }
1715
1716         CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1717                lock, lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1718                pos, lock->l_pid);
1719         if (lock->l_conn_export != NULL)
1720                 obd = lock->l_conn_export->exp_obd;
1721         if (lock->l_export && lock->l_export->exp_connection) {
1722                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1723                      libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1724                      lock->l_remote_handle.cookie);
1725         } else if (obd == NULL) {
1726                 CDEBUG(level, "  Node: local\n");
1727         } else {
1728                 struct obd_import *imp = obd->u.cli.cl_import;
1729                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1730                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1731                        lock->l_remote_handle.cookie);
1732         }
1733         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64")\n", lock->l_resource,
1734                lock->l_resource->lr_name.name[0],
1735                lock->l_resource->lr_name.name[1]);
1736         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1737                "write: %d flags: %#x\n", ldlm_lockname[lock->l_req_mode],
1738                ldlm_lockname[lock->l_granted_mode],
1739                atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1740                lock->l_flags);
1741         if (lock->l_resource->lr_type == LDLM_EXTENT)
1742                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1743                        " (req "LPU64"-"LPU64")\n",
1744                        lock->l_policy_data.l_extent.start,
1745                        lock->l_policy_data.l_extent.end,
1746                        lock->l_req_extent.start, lock->l_req_extent.end);
1747         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1748                 CDEBUG(level, "  Pid: %d Extent: "LPU64" -> "LPU64"\n",
1749                        lock->l_policy_data.l_flock.pid,
1750                        lock->l_policy_data.l_flock.start,
1751                        lock->l_policy_data.l_flock.end);
1752        else if (lock->l_resource->lr_type == LDLM_IBITS)
1753                 CDEBUG(level, "  Bits: "LPX64"\n",
1754                        lock->l_policy_data.l_inodebits.bits);
1755 }
1756
1757 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1758 {
1759         struct ldlm_lock *lock;
1760
1761         if (!((libcfs_debug | D_ERROR) & level))
1762                 return;
1763
1764         lock = ldlm_handle2lock(lockh);
1765         if (lock == NULL)
1766                 return;
1767
1768         ldlm_lock_dump(D_OTHER, lock, 0);
1769
1770         LDLM_LOCK_PUT(lock);
1771 }
1772
1773 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
1774                       struct libcfs_debug_msg_data *data, const char *fmt,
1775                       ...)
1776 {
1777         va_list args;
1778         cfs_debug_limit_state_t *cdls = data->msg_cdls;
1779
1780         va_start(args, fmt);
1781         if (lock->l_resource == NULL) {
1782                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1783                                    data->msg_fn, data->msg_line, fmt, args,
1784                                    " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1785                                    "res: \?\? rrc=\?\? type: \?\?\? flags: %x remote: "
1786                                    LPX64" expref: %d pid: %u\n", lock,
1787                                    lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1788                                    lock->l_readers, lock->l_writers,
1789                                    ldlm_lockname[lock->l_granted_mode],
1790                                    ldlm_lockname[lock->l_req_mode],
1791                                    lock->l_flags, lock->l_remote_handle.cookie,
1792                                    lock->l_export ?
1793                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1794                                    lock->l_pid);
1795                 va_end(args);
1796                 return;
1797         }
1798
1799         switch (lock->l_resource->lr_type) {
1800         case LDLM_EXTENT:
1801                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1802                                    data->msg_fn, data->msg_line, fmt, args,
1803                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1804                                    "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
1805                                    "] (req "LPU64"->"LPU64") flags: %x remote: "LPX64
1806                                     " expref: %d pid: %u\n",
1807                                     lock->l_resource->lr_namespace->ns_name, lock,
1808                                     lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1809                                     lock->l_readers, lock->l_writers,
1810                                     ldlm_lockname[lock->l_granted_mode],
1811                                     ldlm_lockname[lock->l_req_mode],
1812                                     lock->l_resource->lr_name.name[0],
1813                                     lock->l_resource->lr_name.name[1],
1814                                     atomic_read(&lock->l_resource->lr_refcount),
1815                                     ldlm_typename[lock->l_resource->lr_type],
1816                                     lock->l_policy_data.l_extent.start,
1817                                     lock->l_policy_data.l_extent.end,
1818                                     lock->l_req_extent.start, lock->l_req_extent.end,
1819                                     lock->l_flags, lock->l_remote_handle.cookie,
1820                                     lock->l_export ?
1821                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1822                                     lock->l_pid);
1823                 break;
1824         case LDLM_FLOCK:
1825                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1826                                    data->msg_fn, data->msg_line, fmt, args,
1827                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1828                                    "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "
1829                                    "["LPU64"->"LPU64"] flags: %x remote: "LPX64
1830                                    " expref: %d pid: %u\n",
1831                                    lock->l_resource->lr_namespace->ns_name, lock,
1832                                    lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1833                                    lock->l_readers, lock->l_writers,
1834                                    ldlm_lockname[lock->l_granted_mode],
1835                                    ldlm_lockname[lock->l_req_mode],
1836                                    lock->l_resource->lr_name.name[0],
1837                                    lock->l_resource->lr_name.name[1],
1838                                    atomic_read(&lock->l_resource->lr_refcount),
1839                                    ldlm_typename[lock->l_resource->lr_type],
1840                                    lock->l_policy_data.l_flock.pid,
1841                                    lock->l_policy_data.l_flock.start,
1842                                    lock->l_policy_data.l_flock.end,
1843                                    lock->l_flags, lock->l_remote_handle.cookie,
1844                                    lock->l_export ?
1845                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1846                                    lock->l_pid);
1847                 break;
1848         case LDLM_IBITS:
1849                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1850                                    data->msg_fn, data->msg_line, fmt, args,
1851                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1852                                    "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
1853                                    "flags: %x remote: "LPX64" expref: %d "
1854                                    "pid %u\n",
1855                                    lock->l_resource->lr_namespace->ns_name,
1856                                    lock, lock->l_handle.h_cookie,
1857                                    atomic_read (&lock->l_refc),
1858                                    lock->l_readers, lock->l_writers,
1859                                    ldlm_lockname[lock->l_granted_mode],
1860                                    ldlm_lockname[lock->l_req_mode],
1861                                    lock->l_resource->lr_name.name[0],
1862                                    lock->l_resource->lr_name.name[1],
1863                                    lock->l_policy_data.l_inodebits.bits,
1864                                    atomic_read(&lock->l_resource->lr_refcount),
1865                                    ldlm_typename[lock->l_resource->lr_type],
1866                                    lock->l_flags, lock->l_remote_handle.cookie,
1867                                    lock->l_export ?
1868                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1869                                    lock->l_pid);
1870                 break;
1871         default:
1872                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1873                                    data->msg_fn, data->msg_line, fmt, args,
1874                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1875                                    "res: "LPU64"/"LPU64" rrc: %d type: %s flags: %x "
1876                                    "remote: "LPX64" expref: %d pid: %u\n",
1877                                    lock->l_resource->lr_namespace->ns_name,
1878                                    lock, lock->l_handle.h_cookie,
1879                                    atomic_read (&lock->l_refc),
1880                                    lock->l_readers, lock->l_writers,
1881                                    ldlm_lockname[lock->l_granted_mode],
1882                                    ldlm_lockname[lock->l_req_mode],
1883                                    lock->l_resource->lr_name.name[0],
1884                                    lock->l_resource->lr_name.name[1],
1885                                    atomic_read(&lock->l_resource->lr_refcount),
1886                                    ldlm_typename[lock->l_resource->lr_type],
1887                                    lock->l_flags, lock->l_remote_handle.cookie,
1888                                    lock->l_export ?
1889                                          atomic_read(&lock->l_export->exp_refcount) : -99,
1890                                    lock->l_pid);
1891                 break;
1892         }
1893         va_end(args);
1894 }
1895 EXPORT_SYMBOL(_ldlm_lock_debug);