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  * 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 (c) 2002, 2010, Oracle and/or its affiliates. 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/ldlm/ldlm_lock.c
  37  *
  38  * Author: Peter Braam <braam@clusterfs.com>
  39  * Author: Phil Schwan <phil@clusterfs.com>
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_LDLM
  43
  44 #ifdef __KERNEL__
  45 # include <libcfs/libcfs.h>
  46 # include <linux/lustre_intent.h>
  47 #else
  48 # include <liblustre.h>
  49 # include <libcfs/kp30.h>
  50 #endif
  51
  52 #include <obd_class.h>
  53 #include "ldlm_internal.h"
  54
  55 //struct lustre_lock ldlm_everything_lock;
  56
  57 /* lock types */
  58 char *ldlm_lockname[] = {
  59         [0] "--",
  60         [LCK_EX] "EX",
  61         [LCK_PW] "PW",
  62         [LCK_PR] "PR",
  63         [LCK_CW] "CW",
  64         [LCK_CR] "CR",
  65         [LCK_NL] "NL",
  66         [LCK_GROUP] "GROUP"
  67 };
  68
  69 char *ldlm_typename[] = {
  70         [LDLM_PLAIN] "PLN",
  71         [LDLM_EXTENT] "EXT",
  72         [LDLM_FLOCK] "FLK",
  73         [LDLM_IBITS] "IBT",
  74 };
  75
  76 char *ldlm_it2str(int it)
  77 {
  78         switch (it) {
  79         case IT_OPEN:
  80                 return "open";
  81         case IT_CREAT:
  82                 return "creat";
  83         case (IT_OPEN | IT_CREAT):
  84                 return "open|creat";
  85         case IT_READDIR:
  86                 return "readdir";
  87         case IT_GETATTR:
  88                 return "getattr";
  89         case IT_LOOKUP:
  90                 return "lookup";
  91         case IT_UNLINK:
  92                 return "unlink";
  93         case IT_GETXATTR:
  94                 return "getxattr";
  95         default:
  96                 CERROR("Unknown intent %d\n", it);
  97                 return "UNKNOWN";
  98         }
  99 }
 100
 101 extern cfs_mem_cache_t *ldlm_lock_slab;
 102
 103 static ldlm_processing_policy ldlm_processing_policy_table[] = {
 104         [LDLM_PLAIN] ldlm_process_plain_lock,
 105         [LDLM_EXTENT] ldlm_process_extent_lock,
 106 #ifdef __KERNEL__
 107         [LDLM_FLOCK] ldlm_process_flock_lock,
 108 #endif
 109         [LDLM_IBITS] ldlm_process_inodebits_lock,
 110 };
 111
 112 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
 113 {
 114         return ldlm_processing_policy_table[res->lr_type];
 115 }
 116
 117 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
 118 {
 119         ns->ns_policy = arg;
 120 }
 121
 122 /*
 123  * REFCOUNTED LOCK OBJECTS
 124  */
 125
 126
 127 /*
 128  * Lock refcounts, during creation:
 129  *   - one special one for allocation, dec'd only once in destroy
 130  *   - one for being a lock that's in-use
 131  *   - one for the addref associated with a new lock
 132  */
 133 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
 134 {
 135         atomic_inc(&lock->l_refc);
 136         return lock;
 137 }
 138
 139 static void ldlm_lock_free(struct ldlm_lock *lock, size_t size)
 140 {
 141         LASSERT(size == sizeof(*lock));
 142         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
 143 }
 144
 145 void ldlm_lock_put(struct ldlm_lock *lock)
 146 {
 147         ENTRY;
 148
 149         LASSERT(lock->l_resource != LP_POISON);
 150         LASSERT(atomic_read(&lock->l_refc) > 0);
 151         if (atomic_dec_and_test(&lock->l_refc)) {
 152                 struct ldlm_resource *res;
 153
 154                 LDLM_DEBUG(lock, "final lock_put on destroyed lock, freeing it.");
 155
 156                 res = lock->l_resource;
 157                 LASSERT(lock->l_destroyed);
 158                 LASSERT(list_empty(&lock->l_res_link));
 159                 LASSERT(list_empty(&lock->l_pending_chain));
 160
 161                 atomic_dec(&res->lr_namespace->ns_locks);
 162                 ldlm_resource_putref(res);
 163                 lock->l_resource = NULL;
 164                 if (lock->l_export) {
 165                         class_export_put(lock->l_export);
 166                         lock->l_export = NULL;
 167                 }
 168
 169                 if (lock->l_lvb_data != NULL)
 170                         OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
 171
 172                 ldlm_interval_free(ldlm_interval_detach(lock));
 173                 OBD_FREE_RCU_CB(lock, sizeof(*lock), &lock->l_handle,
 174                                 ldlm_lock_free);
 175         }
 176
 177         EXIT;
 178 }
 179
 180 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
 181 {
 182         int rc = 0;
 183         if (!list_empty(&lock->l_lru)) {
 184                 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 185                 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 186                 list_del_init(&lock->l_lru);
 187                 if (lock->l_flags & LDLM_FL_SKIPPED)
 188                         lock->l_flags &= ~LDLM_FL_SKIPPED;
 189                 LASSERT(ns->ns_nr_unused > 0);
 190                 ns->ns_nr_unused--;
 191                 rc = 1;
 192         }
 193         return rc;
 194 }
 195
 196 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
 197 {
 198         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 199         int rc;
 200         ENTRY;
 201         spin_lock(&ns->ns_unused_lock);
 202         rc = ldlm_lock_remove_from_lru_nolock(lock);
 203         spin_unlock(&ns->ns_unused_lock);
 204         EXIT;
 205         return rc;
 206 }
 207
 208 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
 209 {
 210         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 211         lock->l_last_used = cfs_time_current();
 212         LASSERT(list_empty(&lock->l_lru));
 213         LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 214         list_add_tail(&lock->l_lru, &ns->ns_unused_list);
 215         LASSERT(ns->ns_nr_unused >= 0);
 216         ns->ns_nr_unused++;
 217 }
 218
 219 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
 220 {
 221         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 222         ENTRY;
 223         spin_lock(&ns->ns_unused_lock);
 224         ldlm_lock_add_to_lru_nolock(lock);
 225         spin_unlock(&ns->ns_unused_lock);
 226         EXIT;
 227 }
 228
 229 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
 230 {
 231         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 232         ENTRY;
 233         spin_lock(&ns->ns_unused_lock);
 234         if (!list_empty(&lock->l_lru)) {
 235                 ldlm_lock_remove_from_lru_nolock(lock);
 236                 ldlm_lock_add_to_lru_nolock(lock);
 237         }
 238         spin_unlock(&ns->ns_unused_lock);
 239         EXIT;
 240 }
 241
 242 /* This used to have a 'strict' flag, which recovery would use to mark an
 243  * in-use lock as needing-to-die.  Lest I am ever tempted to put it back, I
 244  * shall explain why it's gone: with the new hash table scheme, once you call
 245  * ldlm_lock_destroy, you can never drop your final references on this lock.
 246  * Because it's not in the hash table anymore.  -phil */
 247 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
 248 {
 249         ENTRY;
 250
 251         if (lock->l_readers || lock->l_writers) {
 252                 LDLM_ERROR(lock, "lock still has references");
 253                 ldlm_lock_dump(D_ERROR, lock, 0);
 254                 LBUG();
 255         }
 256
 257         if (!list_empty(&lock->l_res_link)) {
 258                 LDLM_ERROR(lock, "lock still on resource");
 259                 ldlm_lock_dump(D_ERROR, lock, 0);
 260                 LBUG();
 261         }
 262
 263         if (lock->l_destroyed) {
 264                 LASSERT(list_empty(&lock->l_lru));
 265                 EXIT;
 266                 return 0;
 267         }
 268         lock->l_destroyed = 1;
 269
 270         if (lock->l_export && lock->l_export->exp_lock_hash)
 271                 lustre_hash_del(lock->l_export->exp_lock_hash,
 272                                 &lock->l_remote_handle, &lock->l_exp_hash);
 273
 274         ldlm_lock_remove_from_lru(lock);
 275         class_handle_unhash(&lock->l_handle);
 276
 277 #if 0
 278         /* Wake anyone waiting for this lock */
 279         /* FIXME: I should probably add yet another flag, instead of using
 280          * l_export to only call this on clients */
 281         if (lock->l_export)
 282                 class_export_put(lock->l_export);
 283         lock->l_export = NULL;
 284         if (lock->l_export && lock->l_completion_ast)
 285                 lock->l_completion_ast(lock, 0);
 286 #endif
 287         EXIT;
 288         return 1;
 289 }
 290
 291 void ldlm_lock_destroy(struct ldlm_lock *lock)
 292 {
 293         int first;
 294         ENTRY;
 295         lock_res_and_lock(lock);
 296         first = ldlm_lock_destroy_internal(lock);
 297         unlock_res_and_lock(lock);
 298
 299         /* drop reference from hashtable only for first destroy */
 300         if (first)
 301                 LDLM_LOCK_PUT(lock);
 302         EXIT;
 303 }
 304
 305 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
 306 {
 307         int first;
 308         ENTRY;
 309         first = ldlm_lock_destroy_internal(lock);
 310         /* drop reference from hashtable only for first destroy */
 311         if (first)
 312                 LDLM_LOCK_PUT(lock);
 313         EXIT;
 314 }
 315
 316 /* this is called by portals_handle2object with the handle lock taken */
 317 static void lock_handle_addref(void *lock)
 318 {
 319         LDLM_LOCK_GET((struct ldlm_lock *)lock);
 320 }
 321
 322 /*
 323  * usage: pass in a resource on which you have done ldlm_resource_get
 324  *        pass in a parent lock on which you have done a ldlm_lock_get
 325  *        after return, ldlm_*_put the resource and parent
 326  * returns: lock with refcount 2 - one for current caller and one for remote
 327  */
 328 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
 329 {
 330         struct ldlm_lock *lock;
 331         ENTRY;
 332
 333         if (resource == NULL)
 334                 LBUG();
 335
 336         OBD_SLAB_ALLOC(lock, ldlm_lock_slab, CFS_ALLOC_IO, sizeof(*lock));
 337         if (lock == NULL)
 338                 RETURN(NULL);
 339
 340         spin_lock_init(&lock->l_lock);
 341         lock->l_resource = ldlm_resource_getref(resource);
 342
 343         atomic_set(&lock->l_refc, 2);
 344         CFS_INIT_LIST_HEAD(&lock->l_res_link);
 345         CFS_INIT_LIST_HEAD(&lock->l_lru);
 346         CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
 347         CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
 348         CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
 349         cfs_waitq_init(&lock->l_waitq);
 350         lock->l_blocking_lock = NULL;
 351         CFS_INIT_LIST_HEAD(&lock->l_sl_mode);
 352         CFS_INIT_LIST_HEAD(&lock->l_sl_policy);
 353         CFS_INIT_HLIST_NODE(&lock->l_exp_hash);
 354
 355         atomic_inc(&resource->lr_namespace->ns_locks);
 356         CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
 357         class_handle_hash(&lock->l_handle, lock_handle_addref);
 358
 359         CFS_INIT_LIST_HEAD(&lock->l_extents_list);
 360         spin_lock_init(&lock->l_extents_list_lock);
 361         CFS_INIT_LIST_HEAD(&lock->l_cache_locks_list);
 362         lock->l_callback_timeout = 0;
 363
 364         RETURN(lock);
 365 }
 366
 367 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
 368                               struct ldlm_res_id new_resid)
 369 {
 370         struct ldlm_resource *oldres = lock->l_resource;
 371         struct ldlm_resource *newres;
 372         int type;
 373         ENTRY;
 374
 375         LASSERT(ns_is_client(ns));
 376
 377         lock_res_and_lock(lock);
 378         if (memcmp(&new_resid, &lock->l_resource->lr_name,
 379                    sizeof(lock->l_resource->lr_name)) == 0) {
 380                 /* Nothing to do */
 381                 unlock_res_and_lock(lock);
 382                 RETURN(0);
 383         }
 384
 385         LASSERT(new_resid.name[0] != 0);
 386
 387         /* This function assumes that the lock isn't on any lists */
 388         LASSERT(list_empty(&lock->l_res_link));
 389
 390         type = oldres->lr_type;
 391         unlock_res_and_lock(lock);
 392
 393         newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
 394         if (newres == NULL)
 395                 RETURN(-ENOMEM);
 396
 397         lock_res_and_lock(lock);
 398         LASSERT(memcmp(&new_resid, &lock->l_resource->lr_name,
 399                        sizeof(lock->l_resource->lr_name)) != 0);
 400         lock_res(newres);
 401         lock->l_resource = newres;
 402         unlock_res(oldres);
 403         unlock_res_and_lock(lock);
 404
 405         /* ...and the flowers are still standing! */
 406         ldlm_resource_putref(oldres);
 407
 408         RETURN(0);
 409 }
 410
 411 /*
 412  *  HANDLES
 413  */
 414
 415 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh)
 416 {
 417         lockh->cookie = lock->l_handle.h_cookie;
 418 }
 419
 420 /* if flags: atomically get the lock and set the flags.
 421  *           Return NULL if flag already set
 422  */
 423
 424 struct ldlm_lock *__ldlm_handle2lock(struct lustre_handle *handle, int flags)
 425 {
 426         struct ldlm_namespace *ns;
 427         struct ldlm_lock *lock = NULL, *retval = NULL;
 428         ENTRY;
 429
 430         LASSERT(handle);
 431
 432         lock = class_handle2object(handle->cookie);
 433         if (lock == NULL)
 434                 RETURN(NULL);
 435
 436         LASSERT(lock->l_resource != NULL);
 437         ns = lock->l_resource->lr_namespace;
 438         LASSERT(ns != NULL);
 439
 440         lock_res_and_lock(lock);
 441
 442         /* It's unlikely but possible that someone marked the lock as
 443          * destroyed after we did handle2object on it */
 444         if (lock->l_destroyed) {
 445                 unlock_res_and_lock(lock);
 446                 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
 447                 LDLM_LOCK_PUT(lock);
 448                 GOTO(out, retval);
 449         }
 450
 451         if (flags && (lock->l_flags & flags)) {
 452                 unlock_res_and_lock(lock);
 453                 LDLM_LOCK_PUT(lock);
 454                 GOTO(out, retval);
 455         }
 456
 457         if (flags)
 458                 lock->l_flags |= flags;
 459
 460         unlock_res_and_lock(lock);
 461         retval = lock;
 462         EXIT;
 463  out:
 464         return retval;
 465 }
 466
 467 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *ns,
 468                                       struct lustre_handle *handle)
 469 {
 470         struct ldlm_lock *retval = NULL;
 471         retval = __ldlm_handle2lock(handle, 0);
 472         return retval;
 473 }
 474
 475 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 476 {
 477         struct obd_export *exp = lock->l_export?:lock->l_conn_export;
 478         /* INODEBITS_INTEROP: If the other side does not support
 479          * inodebits, reply with a plain lock descriptor.
 480          */
 481         if ((lock->l_resource->lr_type == LDLM_IBITS) &&
 482             (exp && !(exp->exp_connect_flags & OBD_CONNECT_IBITS))) {
 483
 484                 /* Make sure all the right bits are set in this lock we
 485                    are going to pass to client */
 486                 LASSERTF(lock->l_policy_data.l_inodebits.bits ==
 487                          (MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE),
 488                          "Inappropriate inode lock bits during "
 489                          "conversion " LPU64 "\n",
 490                          lock->l_policy_data.l_inodebits.bits);
 491                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 492                 desc->l_resource.lr_type = LDLM_PLAIN;
 493                 /* Convert "new" lock mode to something old client can
 494                    understand */
 495                 if ((lock->l_req_mode == LCK_CR) ||
 496                     (lock->l_req_mode == LCK_CW))
 497                         desc->l_req_mode = LCK_PR;
 498                 else
 499                         desc->l_req_mode = lock->l_req_mode;
 500                 if ((lock->l_granted_mode == LCK_CR) ||
 501                     (lock->l_granted_mode == LCK_CW)) {
 502                         desc->l_granted_mode = LCK_PR;
 503                 } else {
 504                         /* We never grant PW/EX locks to clients */
 505                         LASSERT((lock->l_granted_mode != LCK_PW) &&
 506                                 (lock->l_granted_mode != LCK_EX));
 507                         desc->l_granted_mode = lock->l_granted_mode;
 508                 }
 509
 510                 /* We do not copy policy here, because there is no
 511                    policy for plain locks */
 512         } else {
 513                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 514                 desc->l_req_mode = lock->l_req_mode;
 515                 desc->l_granted_mode = lock->l_granted_mode;
 516                 desc->l_policy_data = lock->l_policy_data;
 517         }
 518 }
 519
 520 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 521                            struct list_head *work_list)
 522 {
 523         if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
 524                 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
 525                 lock->l_flags |= LDLM_FL_AST_SENT;
 526                 /* If the enqueuing client said so, tell the AST recipient to
 527                  * discard dirty data, rather than writing back. */
 528                 if (new->l_flags & LDLM_AST_DISCARD_DATA)
 529                         lock->l_flags |= LDLM_FL_DISCARD_DATA;
 530                 LASSERT(list_empty(&lock->l_bl_ast));
 531                 list_add(&lock->l_bl_ast, work_list);
 532                 LDLM_LOCK_GET(lock);
 533                 LASSERT(lock->l_blocking_lock == NULL);
 534                 lock->l_blocking_lock = LDLM_LOCK_GET(new);
 535         }
 536 }
 537
 538 void ldlm_add_cp_work_item(struct ldlm_lock *lock, struct list_head *work_list)
 539 {
 540         if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
 541                 lock->l_flags |= LDLM_FL_CP_REQD;
 542                 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
 543                 LASSERT(list_empty(&lock->l_cp_ast));
 544                 list_add(&lock->l_cp_ast, work_list);
 545                 LDLM_LOCK_GET(lock);
 546         }
 547 }
 548
 549 /* must be called with lr_lock held */
 550 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 551                                 struct list_head *work_list)
 552 {
 553         ENTRY;
 554         check_res_locked(lock->l_resource);
 555         if (new)
 556                 ldlm_add_bl_work_item(lock, new, work_list);
 557         else
 558                 ldlm_add_cp_work_item(lock, work_list);
 559         EXIT;
 560 }
 561
 562 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
 563 {
 564         struct ldlm_lock *lock;
 565
 566         lock = ldlm_handle2lock(lockh);
 567         LASSERT(lock != NULL);
 568         ldlm_lock_addref_internal(lock, mode);
 569         LDLM_LOCK_PUT(lock);
 570 }
 571
 572 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 573 {
 574         ldlm_lock_remove_from_lru(lock);
 575         if (mode & (LCK_NL | LCK_CR | LCK_PR))
 576                 lock->l_readers++;
 577         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP))
 578                 lock->l_writers++;
 579         LDLM_LOCK_GET(lock);
 580         LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
 581 }
 582
 583 /* only called for local locks */
 584 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
 585 {
 586         lock_res_and_lock(lock);
 587         ldlm_lock_addref_internal_nolock(lock, mode);
 588         unlock_res_and_lock(lock);
 589 }
 590
 591 /* only called in ldlm_flock_destroy and for local locks.
 592  * for LDLM_FLOCK type locks, l_blocking_ast is null, and
 593  * ldlm_lock_remove_from_lru() does nothing, it is safe
 594  * for ldlm_flock_destroy usage by dropping some code */
 595 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 596 {
 597         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 598         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 599                 LASSERT(lock->l_readers > 0);
 600                 lock->l_readers--;
 601         }
 602         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP)) {
 603                 LASSERT(lock->l_writers > 0);
 604                 lock->l_writers--;
 605         }
 606
 607         LDLM_LOCK_PUT(lock);    /* matches the ldlm_lock_get in addref */
 608 }
 609
 610 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
 611 {
 612         struct ldlm_namespace *ns;
 613         ENTRY;
 614
 615         lock_res_and_lock(lock);
 616
 617         ns = lock->l_resource->lr_namespace;
 618
 619         ldlm_lock_decref_internal_nolock(lock, mode);
 620
 621         if (lock->l_flags & LDLM_FL_LOCAL &&
 622             !lock->l_readers && !lock->l_writers) {
 623                 /* If this is a local lock on a server namespace and this was
 624                  * the last reference, cancel the lock. */
 625                 CDEBUG(D_INFO, "forcing cancel of local lock\n");
 626                 lock->l_flags |= LDLM_FL_CBPENDING;
 627         }
 628
 629         if (!lock->l_readers && !lock->l_writers &&
 630             (lock->l_flags & LDLM_FL_CBPENDING)) {
 631                 /* If we received a blocked AST and this was the last reference,
 632                  * run the callback. */
 633                 if (ns_is_server(ns) && lock->l_export)
 634                         CERROR("FL_CBPENDING set on non-local lock--just a "
 635                                "warning\n");
 636
 637                 LDLM_DEBUG(lock, "final decref done on cbpending lock");
 638
 639                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 640                 ldlm_lock_remove_from_lru(lock);
 641                 unlock_res_and_lock(lock);
 642
 643                 if (lock->l_flags & LDLM_FL_FAIL_LOC)
 644                         OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
 645
 646                 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
 647                     ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
 648                         ldlm_handle_bl_callback(ns, NULL, lock);
 649         } else if (ns_is_client(ns) &&
 650                    !lock->l_readers && !lock->l_writers &&
 651                    !(lock->l_flags & LDLM_FL_NO_LRU) &&
 652                    !(lock->l_flags & LDLM_FL_BL_AST)) {
 653                 /* If this is a client-side namespace and this was the last
 654                  * reference, put it on the LRU. */
 655                 ldlm_lock_add_to_lru(lock);
 656                 unlock_res_and_lock(lock);
 657
 658                 if (lock->l_flags & LDLM_FL_FAIL_LOC)
 659                         OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
 660
 661                 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
 662                  * are not supported by the server, otherwise, it is done on
 663                  * enqueue. */
 664                 if (!exp_connect_cancelset(lock->l_conn_export) &&
 665                     !ns_connect_lru_resize(ns))
 666                         ldlm_cancel_lru(ns, 0, LDLM_ASYNC, 0);
 667         } else {
 668                 unlock_res_and_lock(lock);
 669         }
 670
 671         EXIT;
 672 }
 673
 674 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
 675 {
 676         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 677         LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
 678         ldlm_lock_decref_internal(lock, mode);
 679         LDLM_LOCK_PUT(lock);
 680 }
 681
 682 /* This will drop a lock reference and mark it for destruction, but will not
 683  * necessarily cancel the lock before returning. */
 684 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
 685 {
 686         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 687         ENTRY;
 688
 689         LASSERT(lock != NULL);
 690
 691         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 692         lock_res_and_lock(lock);
 693         lock->l_flags |= LDLM_FL_CBPENDING;
 694         unlock_res_and_lock(lock);
 695         ldlm_lock_decref_internal(lock, mode);
 696         LDLM_LOCK_PUT(lock);
 697 }
 698
 699 struct sl_insert_point {
 700         struct list_head *res_link;
 701         struct list_head *mode_link;
 702         struct list_head *policy_link;
 703 };
 704
 705 /*
 706  * search_granted_lock
 707  *
 708  * Description:
 709  *      Finds a position to insert the new lock.
 710  * Parameters:
 711  *      queue [input]:  the granted list where search acts on;
 712  *      req [input]:    the lock whose position to be located;
 713  *      prev [output]:  positions within 3 lists to insert @req to
 714  * Return Value:
 715  *      filled @prev
 716  * NOTE: called by
 717  *  - ldlm_grant_lock_with_skiplist
 718  */
 719 static void search_granted_lock(struct list_head *queue,
 720                                 struct ldlm_lock *req,
 721                                 struct sl_insert_point *prev)
 722 {
 723         struct list_head *tmp;
 724         struct ldlm_lock *lock, *mode_end, *policy_end;
 725         ENTRY;
 726
 727         list_for_each(tmp, queue) {
 728                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 729
 730                 mode_end = list_entry(lock->l_sl_mode.prev, struct ldlm_lock,
 731                                       l_sl_mode);
 732
 733                 if (lock->l_req_mode != req->l_req_mode) {
 734                         /* jump to last lock of mode group */
 735                         tmp = &mode_end->l_res_link;
 736                         continue;
 737                 }
 738
 739                 /* suitable mode group is found */
 740                 if (lock->l_resource->lr_type == LDLM_PLAIN) {
 741                         /* insert point is last lock of the mode group */
 742                         prev->res_link = &mode_end->l_res_link;
 743                         prev->mode_link = &mode_end->l_sl_mode;
 744                         prev->policy_link = &req->l_sl_policy;
 745                         EXIT;
 746                         return;
 747                 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
 748                         for (;;) {
 749                                 policy_end = list_entry(lock->l_sl_policy.prev,
 750                                                         struct ldlm_lock,
 751                                                         l_sl_policy);
 752
 753                                 if (lock->l_policy_data.l_inodebits.bits ==
 754                                     req->l_policy_data.l_inodebits.bits) {
 755                                         /* insert point is last lock of
 756                                          * the policy group */
 757                                         prev->res_link =
 758                                                 &policy_end->l_res_link;
 759                                         prev->mode_link =
 760                                                 &policy_end->l_sl_mode;
 761                                         prev->policy_link =
 762                                                 &policy_end->l_sl_policy;
 763                                         EXIT;
 764                                         return;
 765                                 }
 766
 767                                 if (policy_end == mode_end)
 768                                         /* done with mode group */
 769                                         break;
 770
 771                                 /* jump to next policy group within the mode group */
 772                                 tmp = policy_end->l_res_link.next;
 773                                 lock = list_entry(tmp, struct ldlm_lock,
 774                                                   l_res_link);
 775                         }  /* loop over policy groups within the mode group */
 776
 777                         /* insert point is last lock of the mode group,
 778                          * new policy group is started */
 779                         prev->res_link = &mode_end->l_res_link;
 780                         prev->mode_link = &mode_end->l_sl_mode;
 781                         prev->policy_link = &req->l_sl_policy;
 782                         EXIT;
 783                         return;
 784                 } else {
 785                         LDLM_ERROR(lock, "is not LDLM_PLAIN or LDLM_IBITS lock");
 786                         LBUG();
 787                 }
 788         }
 789
 790         /* insert point is last lock on the queue,
 791          * new mode group and new policy group are started */
 792         prev->res_link = queue->prev;
 793         prev->mode_link = &req->l_sl_mode;
 794         prev->policy_link = &req->l_sl_policy;
 795         EXIT;
 796         return;
 797 }
 798
 799 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
 800                                        struct sl_insert_point *prev)
 801 {
 802         struct ldlm_resource *res = lock->l_resource;
 803         ENTRY;
 804
 805         check_res_locked(res);
 806
 807         ldlm_resource_dump(D_INFO, res);
 808         CDEBUG(D_OTHER, "About to add this lock:\n");
 809         ldlm_lock_dump(D_OTHER, lock, 0);
 810
 811         if (lock->l_destroyed) {
 812                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
 813                 return;
 814         }
 815
 816         LASSERT(list_empty(&lock->l_res_link));
 817         LASSERT(list_empty(&lock->l_sl_mode));
 818         LASSERT(list_empty(&lock->l_sl_policy));
 819
 820         list_add(&lock->l_res_link, prev->res_link);
 821         list_add(&lock->l_sl_mode, prev->mode_link);
 822         list_add(&lock->l_sl_policy, prev->policy_link);
 823
 824         EXIT;
 825 }
 826
 827 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
 828 {
 829         struct sl_insert_point prev;
 830         ENTRY;
 831
 832         LASSERT(lock->l_req_mode == lock->l_granted_mode);
 833
 834         search_granted_lock(&lock->l_resource->lr_granted, lock, &prev);
 835         ldlm_granted_list_add_lock(lock, &prev);
 836         EXIT;
 837 }
 838
 839 /* NOTE: called by
 840  *  - ldlm_lock_enqueue
 841  *  - ldlm_reprocess_queue
 842  *  - ldlm_lock_convert
 843  *
 844  * must be called with lr_lock held
 845  */
 846 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
 847 {
 848         struct ldlm_resource *res = lock->l_resource;
 849         ENTRY;
 850
 851         check_res_locked(res);
 852
 853         lock->l_granted_mode = lock->l_req_mode;
 854         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
 855                 ldlm_grant_lock_with_skiplist(lock);
 856         else if (res->lr_type == LDLM_EXTENT)
 857                 ldlm_extent_add_lock(res, lock);
 858         else
 859                 ldlm_resource_add_lock(res, &res->lr_granted, lock);
 860
 861         if (lock->l_granted_mode < res->lr_most_restr)
 862                 res->lr_most_restr = lock->l_granted_mode;
 863
 864         if (work_list && lock->l_completion_ast != NULL)
 865                 ldlm_add_ast_work_item(lock, NULL, work_list);
 866
 867         ldlm_pool_add(&res->lr_namespace->ns_pool, lock);
 868         EXIT;
 869 }
 870
 871 /* returns a referenced lock or NULL.  See the flag descriptions below, in the
 872  * comment above ldlm_lock_match */
 873 static struct ldlm_lock *search_queue(struct list_head *queue,
 874                                       ldlm_mode_t *mode,
 875                                       ldlm_policy_data_t *policy,
 876                                       struct ldlm_lock *old_lock, int flags)
 877 {
 878         struct ldlm_lock *lock;
 879         struct list_head *tmp;
 880
 881         list_for_each(tmp, queue) {
 882                 ldlm_mode_t match;
 883
 884                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 885
 886                 if (lock == old_lock)
 887                         break;
 888
 889                 /* llite sometimes wants to match locks that will be
 890                  * canceled when their users drop, but we allow it to match
 891                  * if it passes in CBPENDING and the lock still has users.
 892                  * this is generally only going to be used by children
 893                  * whose parents already hold a lock so forward progress
 894                  * can still happen. */
 895                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 896                     !(flags & LDLM_FL_CBPENDING))
 897                         continue;
 898                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 899                     lock->l_readers == 0 && lock->l_writers == 0)
 900                         continue;
 901
 902                 if (!(lock->l_req_mode & *mode))
 903                         continue;
 904
 905                 match = lock->l_req_mode;
 906                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 907                     (lock->l_policy_data.l_extent.start >
 908                      policy->l_extent.start ||
 909                      lock->l_policy_data.l_extent.end < policy->l_extent.end))
 910                         continue;
 911
 912                 if (unlikely(match == LCK_GROUP) &&
 913                     lock->l_resource->lr_type == LDLM_EXTENT &&
 914                     lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
 915                         continue;
 916
 917                 /* We match if we have existing lock with same or wider set
 918                    of bits. */
 919                 if (lock->l_resource->lr_type == LDLM_IBITS &&
 920                      ((lock->l_policy_data.l_inodebits.bits &
 921                       policy->l_inodebits.bits) !=
 922                       policy->l_inodebits.bits))
 923                         continue;
 924
 925                 if (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED))
 926                         continue;
 927
 928                 if ((flags & LDLM_FL_LOCAL_ONLY) &&
 929                     !(lock->l_flags & LDLM_FL_LOCAL))
 930                         continue;
 931
 932                 if (flags & LDLM_FL_TEST_LOCK) {
 933                         LDLM_LOCK_GET(lock);
 934                         ldlm_lock_touch_in_lru(lock);
 935                 } else {
 936                         ldlm_lock_addref_internal_nolock(lock, match);
 937                 }
 938                 *mode = match;
 939                 return lock;
 940         }
 941
 942         return NULL;
 943 }
 944
 945 void ldlm_lock_allow_match(struct ldlm_lock *lock)
 946 {
 947         lock_res_and_lock(lock);
 948         lock->l_flags |= LDLM_FL_LVB_READY;
 949         cfs_waitq_signal(&lock->l_waitq);
 950         unlock_res_and_lock(lock);
 951 }
 952
 953 int ldlm_lock_fast_match(struct ldlm_lock *lock, int rw,
 954                          obd_off start, obd_off end,
 955                          struct lustre_handle *lockh)
 956 {
 957         LASSERT(rw == OBD_BRW_READ || rw == OBD_BRW_WRITE);
 958         LASSERT(lockh != NULL);
 959
 960         if (!lock)
 961                 return 0;
 962
 963         lock_res_and_lock(lock);
 964         /* check if granted mode is compatible */
 965         if (rw == OBD_BRW_WRITE &&
 966             !(lock->l_granted_mode & (LCK_PW|LCK_GROUP)))
 967                 goto no_match;
 968
 969         /* does the lock cover the region we would like to access? */
 970         if ((lock->l_policy_data.l_extent.start > start) ||
 971             (lock->l_policy_data.l_extent.end < end))
 972                 goto no_match;
 973
 974         /* if we received a blocking callback and the lock is no longer
 975          * referenced, don't use it */
 976         if ((lock->l_flags & LDLM_FL_CBPENDING) &&
 977             !lock->l_writers && !lock->l_readers)
 978                 goto no_match;
 979
 980         ldlm_lock_addref_internal_nolock(lock,
 981                                          rw == OBD_BRW_WRITE ? LCK_PW : LCK_PR);
 982         unlock_res_and_lock(lock);
 983         ldlm_lock2handle(lock, lockh);
 984         return 1; /* avoid using rc for stack relief */
 985
 986 no_match:
 987         unlock_res_and_lock(lock);
 988         return 0;
 989 }
 990
 991 /* Can be called in two ways:
 992  *
 993  * If 'ns' is NULL, then lockh describes an existing lock that we want to look
 994  * for a duplicate of.
 995  *
 996  * Otherwise, all of the fields must be filled in, to match against.
 997  *
 998  * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
 999  *     server (ie, connh is NULL)
1000  * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
1001  *     list will be considered
1002  * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
1003  *     to be canceled can still be matched as long as they still have reader
1004  *     or writer refernces
1005  * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
1006  *     just tell us if we would have matched.
1007  *
1008  * Returns 1 if it finds an already-existing lock that is compatible; in this
1009  * case, lockh is filled in with a addref()ed lock
1010  */
1011 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, int flags,
1012                             struct ldlm_res_id *res_id, ldlm_type_t type,
1013                             ldlm_policy_data_t *policy, ldlm_mode_t mode,
1014                             struct lustre_handle *lockh)
1015 {
1016         struct ldlm_resource *res;
1017         struct ldlm_lock *lock, *old_lock = NULL;
1018         int rc = 0;
1019         ENTRY;
1020
1021         if (ns == NULL) {
1022                 old_lock = ldlm_handle2lock(lockh);
1023                 LASSERT(old_lock);
1024
1025                 ns = old_lock->l_resource->lr_namespace;
1026                 res_id = &old_lock->l_resource->lr_name;
1027                 type = old_lock->l_resource->lr_type;
1028                 mode = old_lock->l_req_mode;
1029         }
1030
1031         res = ldlm_resource_get(ns, NULL, *res_id, type, 0);
1032         if (res == NULL) {
1033                 LASSERT(old_lock == NULL);
1034                 RETURN(0);
1035         }
1036
1037         lock_res(res);
1038
1039         lock = search_queue(&res->lr_granted, &mode, policy, old_lock, flags);
1040         if (lock != NULL)
1041                 GOTO(out, rc = 1);
1042         if (flags & LDLM_FL_BLOCK_GRANTED)
1043                 GOTO(out, rc = 0);
1044         lock = search_queue(&res->lr_converting, &mode, policy, old_lock, flags);
1045         if (lock != NULL)
1046                 GOTO(out, rc = 1);
1047         lock = search_queue(&res->lr_waiting, &mode, policy, old_lock, flags);
1048         if (lock != NULL)
1049                 GOTO(out, rc = 1);
1050
1051         EXIT;
1052  out:
1053         unlock_res(res);
1054         ldlm_resource_putref(res);
1055
1056         if (lock) {
1057                 ldlm_lock2handle(lock, lockh);
1058                 if ((flags & LDLM_FL_LVB_READY) && (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1059                         struct l_wait_info lwi;
1060                         if (lock->l_completion_ast) {
1061                                 int err = lock->l_completion_ast(lock,
1062                                                           LDLM_FL_WAIT_NOREPROC,
1063                                                                  NULL);
1064                                 if (err) {
1065                                         if (flags & LDLM_FL_TEST_LOCK)
1066                                                 LDLM_LOCK_PUT(lock);
1067                                         else
1068                                                 ldlm_lock_decref_internal(lock, mode);
1069                                         rc = 0;
1070                                         goto out2;
1071                                 }
1072                         }
1073
1074                         lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout), NULL,
1075                                                LWI_ON_SIGNAL_NOOP, NULL);
1076
1077                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1078                         l_wait_event(lock->l_waitq,
1079                                      (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1080                 }
1081         }
1082  out2:
1083         if (rc) {
1084                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1085                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1086                                 res_id->name[2] : policy->l_extent.start,
1087                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1088                                 res_id->name[3] : policy->l_extent.end);
1089         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1090                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1091                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1092                                   type, mode, res_id->name[0], res_id->name[1],
1093                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1094                                         res_id->name[2] :policy->l_extent.start,
1095                                 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1096                                         res_id->name[3] : policy->l_extent.end);
1097         }
1098         if (old_lock)
1099                 LDLM_LOCK_PUT(old_lock);
1100         if (flags & LDLM_FL_TEST_LOCK && rc)
1101                 LDLM_LOCK_PUT(lock);
1102
1103         return rc ? mode : 0;
1104 }
1105
1106 /* Returns a referenced lock */
1107 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1108                                    struct ldlm_res_id res_id, ldlm_type_t type,
1109                                    ldlm_mode_t mode,
1110                                    ldlm_blocking_callback blocking,
1111                                    ldlm_completion_callback completion,
1112                                    ldlm_glimpse_callback glimpse,
1113                                    void *data, __u32 lvb_len)
1114 {
1115         struct ldlm_lock *lock;
1116         struct ldlm_resource *res;
1117         ENTRY;
1118
1119         res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1120         if (res == NULL)
1121                 RETURN(NULL);
1122
1123         lock = ldlm_lock_new(res);
1124         ldlm_resource_putref(res);
1125
1126         if (lock == NULL)
1127                 RETURN(NULL);
1128
1129         lock->l_req_mode = mode;
1130         lock->l_ast_data = data;
1131         lock->l_blocking_ast = blocking;
1132         lock->l_completion_ast = completion;
1133         lock->l_glimpse_ast = glimpse;
1134         lock->l_pid = cfs_curproc_pid();
1135
1136         lock->l_tree_node = NULL;
1137         /* if this is the extent lock, allocate the interval tree node */
1138         if (type == LDLM_EXTENT) {
1139                 if (ldlm_interval_alloc(lock) == NULL)
1140                         GOTO(out, 0);
1141         }
1142
1143         if (lvb_len) {
1144                 lock->l_lvb_len = lvb_len;
1145                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1146                 if (lock->l_lvb_data == NULL)
1147                         GOTO(out, 0);
1148         }
1149
1150         RETURN(lock);
1151
1152 out:
1153         if (lock->l_lvb_data)
1154                 OBD_FREE(lock->l_lvb_data, lvb_len);
1155         ldlm_interval_free(ldlm_interval_detach(lock));
1156         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
1157         return NULL;
1158 }
1159
1160 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1161                                struct ldlm_lock **lockp,
1162                                void *cookie, int *flags)
1163 {
1164         struct ldlm_lock *lock = *lockp;
1165         struct ldlm_resource *res = lock->l_resource;
1166         int local = ns_is_client(res->lr_namespace);
1167         ldlm_processing_policy policy;
1168         ldlm_error_t rc = ELDLM_OK;
1169         struct ldlm_interval *node = NULL;
1170         ENTRY;
1171
1172         lock->l_last_activity = cfs_time_current_sec();
1173         /* policies are not executed on the client or during replay */
1174         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1175             && !local && ns->ns_policy) {
1176                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1177                                    NULL);
1178                 if (rc == ELDLM_LOCK_REPLACED) {
1179                         /* The lock that was returned has already been granted,
1180                          * and placed into lockp.  If it's not the same as the
1181                          * one we passed in, then destroy the old one and our
1182                          * work here is done. */
1183                         if (lock != *lockp) {
1184                                 ldlm_lock_destroy(lock);
1185                                 LDLM_LOCK_PUT(lock);
1186                         }
1187                         *flags |= LDLM_FL_LOCK_CHANGED;
1188                         RETURN(0);
1189                 } else if (rc != ELDLM_OK ||
1190                            (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1191                         ldlm_lock_destroy(lock);
1192                         RETURN(rc);
1193                 }
1194         }
1195
1196         /* For a replaying lock, it might be already in granted list. So
1197          * unlinking the lock will cause the interval node to be freed, we
1198          * have to allocate the interval node early otherwise we can't regrant
1199          * this lock in the future. - jay */
1200         if (!local && (*flags & LDLM_FL_REPLAY) && res->lr_type == LDLM_EXTENT)
1201                 OBD_SLAB_ALLOC(node, ldlm_interval_slab, CFS_ALLOC_IO,
1202                                sizeof(*node));
1203         if(res->lr_type == LDLM_EXTENT)
1204                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_LOCAL, 30);
1205
1206         lock_res_and_lock(lock);
1207         if (lock->l_destroyed)
1208                 GOTO(out, rc = -EAGAIN);
1209
1210         if (local && lock->l_req_mode == lock->l_granted_mode) {
1211                 /* The server returned a blocked lock, but it was granted
1212                  * before we got a chance to actually enqueue it.  We don't
1213                  * need to do anything else. */
1214                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1215                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1216                 GOTO(out, ELDLM_OK);
1217         }
1218
1219         ldlm_resource_unlink_lock(lock);
1220         if (res->lr_type == LDLM_EXTENT && lock->l_tree_node == NULL) {
1221                 LASSERT(!local && (*flags & LDLM_FL_REPLAY));
1222                 if (node == NULL) {
1223                         ldlm_lock_destroy_nolock(lock);
1224                         GOTO(out, rc = -ENOMEM);
1225                 }
1226
1227                 CFS_INIT_LIST_HEAD(&node->li_group);
1228                 ldlm_interval_attach(node, lock);
1229                 node = NULL;
1230         }
1231
1232         /* Some flags from the enqueue want to make it into the AST, via the
1233          * lock's l_flags. */
1234         lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1235
1236         /* This distinction between local lock trees is very important; a client
1237          * namespace only has information about locks taken by that client, and
1238          * thus doesn't have enough information to decide for itself if it can
1239          * be granted (below).  In this case, we do exactly what the server
1240          * tells us to do, as dictated by the 'flags'.
1241          *
1242          * We do exactly the same thing during recovery, when the server is
1243          * more or less trusting the clients not to lie.
1244          *
1245          * FIXME (bug 268): Detect obvious lies by checking compatibility in
1246          * granted/converting queues. */
1247         if (local) {
1248                 if (*flags & LDLM_FL_BLOCK_CONV)
1249                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1250                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1251                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1252                 else
1253                         ldlm_grant_lock(lock, NULL);
1254                 GOTO(out, ELDLM_OK);
1255         } else if (*flags & LDLM_FL_REPLAY) {
1256                 if (*flags & LDLM_FL_BLOCK_CONV) {
1257                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1258                         GOTO(out, ELDLM_OK);
1259                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1260                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1261                         GOTO(out, ELDLM_OK);
1262                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1263                         ldlm_grant_lock(lock, NULL);
1264                         GOTO(out, ELDLM_OK);
1265                 }
1266                 /* If no flags, fall through to normal enqueue path. */
1267         }
1268
1269         policy = ldlm_processing_policy_table[res->lr_type];
1270         policy(lock, flags, 1, &rc, NULL);
1271         GOTO(out, rc);
1272 out:
1273         unlock_res_and_lock(lock);
1274         if (node)
1275                 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1276         return rc;
1277 }
1278
1279 /* Must be called with namespace taken: queue is waiting or converting. */
1280 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
1281                          struct list_head *work_list)
1282 {
1283         struct list_head *tmp, *pos;
1284         ldlm_processing_policy policy;
1285         int flags;
1286         int rc = LDLM_ITER_CONTINUE;
1287         ldlm_error_t err;
1288         ENTRY;
1289
1290         check_res_locked(res);
1291
1292         policy = ldlm_processing_policy_table[res->lr_type];
1293         LASSERT(policy);
1294
1295         list_for_each_safe(tmp, pos, queue) {
1296                 struct ldlm_lock *pending;
1297                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
1298
1299                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1300
1301                 flags = 0;
1302                 rc = policy(pending, &flags, 0, &err, work_list);
1303                 if (rc != LDLM_ITER_CONTINUE)
1304                         break;
1305         }
1306
1307         RETURN(rc);
1308 }
1309
1310 /* Helper function for pair ldlm_run_{bl,cp}_ast_work().
1311  *
1312  * Send an existing rpc set specified by @arg->set and then
1313  * destroy it. Create new one if @do_create flag is set. */
1314 static void
1315 ldlm_send_and_maybe_create_set(struct ldlm_cb_set_arg *arg, int do_create)
1316 {
1317         int rc;
1318
1319         rc = ptlrpc_set_wait(arg->set);
1320         if (arg->type == LDLM_BL_CALLBACK)
1321                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_GLIMPSE, 2);
1322         ptlrpc_set_destroy(arg->set);
1323
1324         if (do_create)
1325                 arg->set = ptlrpc_prep_set();
1326 }
1327
1328 int ldlm_run_bl_ast_work(struct list_head *rpc_list)
1329 {
1330         struct ldlm_cb_set_arg arg;
1331         struct list_head *tmp, *pos;
1332         struct ldlm_lock_desc d;
1333         int ast_count;
1334         int rc = 0;
1335         ENTRY;
1336
1337         if (list_empty(rpc_list))
1338                 RETURN(0);
1339
1340         arg.set = ptlrpc_prep_set();
1341         if (NULL == arg.set)
1342                 RETURN(-ERESTART);
1343         atomic_set(&arg.restart, 0);
1344         arg.type = LDLM_BL_CALLBACK;
1345
1346         ast_count = 0;
1347         list_for_each_safe(tmp, pos, rpc_list) {
1348                 struct ldlm_lock *lock =
1349                         list_entry(tmp, struct ldlm_lock, l_bl_ast);
1350
1351                 /* nobody should touch l_bl_ast */
1352                 lock_res_and_lock(lock);
1353                 list_del_init(&lock->l_bl_ast);
1354
1355                 LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1356                 LASSERT(lock->l_bl_ast_run == 0);
1357                 LASSERT(lock->l_blocking_lock);
1358                 lock->l_bl_ast_run++;
1359                 unlock_res_and_lock(lock);
1360
1361                 ldlm_lock2desc(lock->l_blocking_lock, &d);
1362
1363                 LDLM_LOCK_PUT(lock->l_blocking_lock);
1364                 lock->l_blocking_lock = NULL;
1365                 rc = lock->l_blocking_ast(lock, &d, (void *)&arg,
1366                                           LDLM_CB_BLOCKING);
1367                 LDLM_LOCK_PUT(lock);
1368                 ast_count++;
1369
1370                 /* Send the request set if it exceeds the PARALLEL_AST_LIMIT,
1371                  * and create a new set for requests that remained in
1372                  * @rpc_list */
1373                 if (unlikely(ast_count == PARALLEL_AST_LIMIT)) {
1374                         ldlm_send_and_maybe_create_set(&arg, 1);
1375                         ast_count = 0;
1376                 }
1377         }
1378
1379         if (ast_count > 0)
1380                 ldlm_send_and_maybe_create_set(&arg, 0);
1381         else
1382                 /* In case when number of ASTs is multiply of
1383                  * PARALLEL_AST_LIMIT or @rpc_list was initially empty,
1384                  * @arg.set must be destroyed here, otherwise we get
1385                  * write memory leaking. */
1386                 ptlrpc_set_destroy(arg.set);
1387
1388         RETURN(atomic_read(&arg.restart) ? -ERESTART : 0);
1389 }
1390
1391 int ldlm_run_cp_ast_work(struct list_head *rpc_list)
1392 {
1393         struct ldlm_cb_set_arg arg;
1394         struct list_head *tmp, *pos;
1395         int ast_count;
1396         int rc = 0;
1397         ENTRY;
1398
1399         if (list_empty(rpc_list))
1400                 RETURN(0);
1401
1402         arg.set = ptlrpc_prep_set();
1403         if (NULL == arg.set)
1404                 RETURN(-ERESTART);
1405         atomic_set(&arg.restart, 0);
1406         arg.type = LDLM_CP_CALLBACK;
1407
1408         /* It's possible to receive a completion AST before we've set
1409          * the l_completion_ast pointer: either because the AST arrived
1410          * before the reply, or simply because there's a small race
1411          * window between receiving the reply and finishing the local
1412          * enqueue. (bug 842)
1413          *
1414          * This can't happen with the blocking_ast, however, because we
1415          * will never call the local blocking_ast until we drop our
1416          * reader/writer reference, which we won't do until we get the
1417          * reply and finish enqueueing. */
1418
1419         ast_count = 0;
1420         list_for_each_safe(tmp, pos, rpc_list) {
1421                 struct ldlm_lock *lock =
1422                         list_entry(tmp, struct ldlm_lock, l_cp_ast);
1423                 ldlm_completion_callback completion_callback;
1424
1425                 /* nobody should touch l_cp_ast */
1426                 lock_res_and_lock(lock);
1427                 list_del_init(&lock->l_cp_ast);
1428                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1429                 /* save l_completion_ast since it can be changed by
1430                  * mds_intent_policy(), see bug 14225 */
1431                 completion_callback = lock->l_completion_ast;
1432                 lock->l_flags &= ~LDLM_FL_CP_REQD;
1433                 unlock_res_and_lock(lock);
1434
1435                 if (completion_callback != NULL) {
1436                         rc = completion_callback(lock, 0, (void *)&arg);
1437                         ast_count++;
1438                 }
1439                 LDLM_LOCK_PUT(lock);
1440
1441                 /* Send the request set if it exceeds the PARALLEL_AST_LIMIT,
1442                  * and create a new set for requests that remained in
1443                  * @rpc_list */
1444                 if (unlikely(ast_count == PARALLEL_AST_LIMIT)) {
1445                         ldlm_send_and_maybe_create_set(&arg, 1);
1446                         ast_count = 0;
1447                 }
1448         }
1449
1450         if (ast_count > 0)
1451                 ldlm_send_and_maybe_create_set(&arg, 0);
1452         else
1453                 /* In case when number of ASTs is multiply of
1454                  * PARALLEL_AST_LIMIT or @rpc_list was initially empty,
1455                  * @arg.set must be destroyed here, otherwise we get
1456                  * write memory leaking. */
1457                 ptlrpc_set_destroy(arg.set);
1458
1459         RETURN(atomic_read(&arg.restart) ? -ERESTART : 0);
1460 }
1461
1462 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1463 {
1464         ldlm_reprocess_all(res);
1465         return LDLM_ITER_CONTINUE;
1466 }
1467
1468 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1469 {
1470         struct list_head *tmp;
1471         int i, rc;
1472
1473         ENTRY;
1474         spin_lock(&ns->ns_hash_lock);
1475         for (i = 0; i < RES_HASH_SIZE; i++) {
1476                 tmp = ns->ns_hash[i].next;
1477                 while (tmp != &(ns->ns_hash[i])) {
1478                         struct ldlm_resource *res =
1479                                 list_entry(tmp, struct ldlm_resource, lr_hash);
1480
1481                         ldlm_resource_getref(res);
1482                         spin_unlock(&ns->ns_hash_lock);
1483
1484                         rc = reprocess_one_queue(res, NULL);
1485
1486                         spin_lock(&ns->ns_hash_lock);
1487                         tmp = tmp->next;
1488                         ldlm_resource_putref_locked(res);
1489
1490                         if (rc == LDLM_ITER_STOP)
1491                                 GOTO(out, rc);
1492                 }
1493         }
1494  out:
1495         spin_unlock(&ns->ns_hash_lock);
1496         EXIT;
1497 }
1498
1499 void ldlm_reprocess_all(struct ldlm_resource *res)
1500 {
1501         CFS_LIST_HEAD(rpc_list);
1502         int rc;
1503         ENTRY;
1504
1505         /* Local lock trees don't get reprocessed. */
1506         if (ns_is_client(res->lr_namespace)) {
1507                 EXIT;
1508                 return;
1509         }
1510
1511  restart:
1512         lock_res(res);
1513         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1514         if (rc == LDLM_ITER_CONTINUE)
1515                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1516         unlock_res(res);
1517
1518         rc = ldlm_run_cp_ast_work(&rpc_list);
1519         if (rc == -ERESTART) {
1520                 LASSERT(list_empty(&rpc_list));
1521                 goto restart;
1522         }
1523         EXIT;
1524 }
1525
1526 void ldlm_cancel_callback(struct ldlm_lock *lock)
1527 {
1528         check_res_locked(lock->l_resource);
1529         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1530                 lock->l_flags |= LDLM_FL_CANCEL;
1531                 if (lock->l_blocking_ast) {
1532                         // l_check_no_ns_lock(ns);
1533                         unlock_res_and_lock(lock);
1534                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1535                                              LDLM_CB_CANCELING);
1536                         lock_res_and_lock(lock);
1537                 } else {
1538                         LDLM_DEBUG(lock, "no blocking ast");
1539                 }
1540         }
1541         lock->l_flags |= LDLM_FL_BL_DONE;
1542 }
1543
1544 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1545 {
1546         if (req->l_resource->lr_type != LDLM_PLAIN &&
1547             req->l_resource->lr_type != LDLM_IBITS)
1548                 return;
1549
1550         list_del_init(&req->l_sl_policy);
1551         list_del_init(&req->l_sl_mode);
1552 }
1553
1554 void ldlm_lock_cancel(struct ldlm_lock *lock)
1555 {
1556         struct ldlm_resource *res;
1557         struct ldlm_namespace *ns;
1558         ENTRY;
1559
1560         lock_res_and_lock(lock);
1561
1562         res = lock->l_resource;
1563         ns = res->lr_namespace;
1564
1565         /* Please do not, no matter how tempting, remove this LBUG without
1566          * talking to me first. -phik */
1567         if (lock->l_readers || lock->l_writers) {
1568                 LDLM_ERROR(lock, "lock still has references");
1569                 LBUG();
1570         }
1571
1572         ldlm_del_waiting_lock(lock);
1573         /* Releases res lock */
1574         ldlm_cancel_callback(lock);
1575
1576         /* Yes, second time, just in case it was added again while we were
1577            running with no res lock in ldlm_cancel_callback */
1578         ldlm_del_waiting_lock(lock);
1579
1580         ldlm_resource_unlink_lock(lock);
1581         ldlm_lock_destroy_nolock(lock);
1582
1583         if (lock->l_granted_mode == lock->l_req_mode)
1584                 ldlm_pool_del(&ns->ns_pool, lock);
1585
1586         /* Make sure we will not be called again for same lock what is possible
1587          * if not to zero out lock->l_granted_mode */
1588         lock->l_granted_mode = 0;
1589         unlock_res_and_lock(lock);
1590
1591         EXIT;
1592 }
1593
1594 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1595 {
1596         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1597         ENTRY;
1598
1599         if (lock == NULL)
1600                 RETURN(-EINVAL);
1601
1602         lock->l_ast_data = data;
1603         LDLM_LOCK_PUT(lock);
1604         RETURN(0);
1605 }
1606
1607 void ldlm_cancel_locks_for_export_cb(void *obj, void *data)
1608 {
1609         struct obd_export     *exp = data;
1610         struct ldlm_lock      *lock = obj;
1611         struct ldlm_resource  *res;
1612
1613         res = ldlm_resource_getref(lock->l_resource);
1614         LDLM_LOCK_GET(lock);
1615
1616         LDLM_DEBUG(lock, "export %p", exp);
1617         ldlm_res_lvbo_update(res, NULL, 0, 1);
1618
1619         ldlm_lock_cancel(lock);
1620         ldlm_reprocess_all(res);
1621
1622         ldlm_resource_putref(res);
1623         LDLM_LOCK_PUT(lock);
1624 }
1625
1626 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1627 {
1628         lustre_hash_for_each_empty(exp->exp_lock_hash,
1629                                    ldlm_cancel_locks_for_export_cb, exp);
1630 }
1631
1632 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1633                                         __u32 *flags)
1634 {
1635         CFS_LIST_HEAD(rpc_list);
1636         struct ldlm_resource *res;
1637         struct ldlm_namespace *ns;
1638         int granted = 0;
1639         int old_mode, rc;
1640         struct sl_insert_point prev;
1641         ldlm_error_t err;
1642         struct ldlm_interval *node;
1643         ENTRY;
1644
1645         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1646                 *flags |= LDLM_FL_BLOCK_GRANTED;
1647                 RETURN(lock->l_resource);
1648         }
1649
1650         /* I can't check the type of lock here because the bitlock of lock
1651          * is not held here, so do the allocation blindly. -jay */
1652         OBD_SLAB_ALLOC(node, ldlm_interval_slab, CFS_ALLOC_IO, sizeof(*node));
1653         if (node == NULL)  /* Actually, this causes EDEADLOCK to be returned */
1654                 RETURN(NULL);
1655
1656         LASSERTF(new_mode == LCK_PW && lock->l_granted_mode == LCK_PR,
1657                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1658
1659         lock_res_and_lock(lock);
1660         if (unlikely(lock->l_destroyed != 0)) {
1661                 unlock_res_and_lock(lock);
1662                 RETURN(NULL);
1663         }
1664
1665         res = lock->l_resource;
1666         ns = res->lr_namespace;
1667
1668         old_mode = lock->l_req_mode;
1669         lock->l_req_mode = new_mode;
1670         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1671                 /* remember the lock position where the lock might be
1672                  * added back to the granted list later and also
1673                  * remember the join mode for skiplist fixing. */
1674                 prev.res_link = lock->l_res_link.prev;
1675                 prev.mode_link = lock->l_sl_mode.prev;
1676                 prev.policy_link = lock->l_sl_policy.prev;
1677                 ldlm_resource_unlink_lock(lock);
1678         } else {
1679                 ldlm_resource_unlink_lock(lock);
1680                 if (res->lr_type == LDLM_EXTENT) {
1681                         /* FIXME: ugly code, I have to attach the lock to a
1682                          * interval node again since perhaps it will be granted
1683                          * soon */
1684                         CFS_INIT_LIST_HEAD(&node->li_group);
1685                         ldlm_interval_attach(node, lock);
1686                         node = NULL;
1687                 }
1688         }
1689
1690         /* If this is a local resource, put it on the appropriate list. */
1691         if (ns_is_client(res->lr_namespace)) {
1692                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1693                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1694                 } else {
1695                         /* This should never happen, because of the way the
1696                          * server handles conversions. */
1697                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1698                                    *flags);
1699                         LBUG();
1700
1701                         ldlm_grant_lock(lock, &rpc_list);
1702                         granted = 1;
1703                         /* FIXME: completion handling not with ns_lock held ! */
1704                         if (lock->l_completion_ast)
1705                                 lock->l_completion_ast(lock, 0, NULL);
1706                 }
1707         } else {
1708                 int pflags = 0;
1709                 ldlm_processing_policy policy;
1710                 policy = ldlm_processing_policy_table[res->lr_type];
1711                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1712                 if (rc == LDLM_ITER_STOP) {
1713                         lock->l_req_mode = old_mode;
1714                         if (res->lr_type == LDLM_EXTENT)
1715                                 ldlm_extent_add_lock(res, lock);
1716                         else
1717                                 ldlm_granted_list_add_lock(lock, &prev);
1718
1719                         res = NULL;
1720                 } else {
1721                         *flags |= LDLM_FL_BLOCK_GRANTED;
1722                         granted = 1;
1723                 }
1724         }
1725         unlock_res_and_lock(lock);
1726
1727         if (granted)
1728                 ldlm_run_cp_ast_work(&rpc_list);
1729         if (node)
1730                 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1731         RETURN(res);
1732 }
1733
1734 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1735 {
1736         struct obd_device *obd = NULL;
1737
1738         if (!((libcfs_debug | D_ERROR) & level))
1739                 return;
1740
1741         if (!lock) {
1742                 CDEBUG(level, "  NULL LDLM lock\n");
1743                 return;
1744         }
1745
1746         CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1747                lock, lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1748                pos, lock->l_pid);
1749         if (lock->l_conn_export != NULL)
1750                 obd = lock->l_conn_export->exp_obd;
1751         if (lock->l_export && lock->l_export->exp_connection) {
1752                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1753                      libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1754                      lock->l_remote_handle.cookie);
1755         } else if (obd == NULL) {
1756                 CDEBUG(level, "  Node: local\n");
1757         } else {
1758                 struct obd_import *imp = obd->u.cli.cl_import;
1759                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1760                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1761                        lock->l_remote_handle.cookie);
1762         }
1763         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64")\n", lock->l_resource,
1764                lock->l_resource->lr_name.name[0],
1765                lock->l_resource->lr_name.name[1]);
1766         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1767                "write: %d flags: "LPX64"\n", ldlm_lockname[lock->l_req_mode],
1768                ldlm_lockname[lock->l_granted_mode],
1769                atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1770                lock->l_flags);
1771         if (lock->l_resource->lr_type == LDLM_EXTENT)
1772                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1773                        " (req "LPU64"-"LPU64")\n",
1774                        lock->l_policy_data.l_extent.start,
1775                        lock->l_policy_data.l_extent.end,
1776                        lock->l_req_extent.start, lock->l_req_extent.end);
1777         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1778                 CDEBUG(level, "  Pid: %d Extent: "LPU64" -> "LPU64"\n",
1779                        lock->l_policy_data.l_flock.pid,
1780                        lock->l_policy_data.l_flock.start,
1781                        lock->l_policy_data.l_flock.end);
1782        else if (lock->l_resource->lr_type == LDLM_IBITS)
1783                 CDEBUG(level, "  Bits: "LPX64"\n",
1784                        lock->l_policy_data.l_inodebits.bits);
1785 }
1786
1787 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1788 {
1789         struct ldlm_lock *lock;
1790
1791         if (!((libcfs_debug | D_ERROR) & level))
1792                 return;
1793
1794         lock = ldlm_handle2lock(lockh);
1795         if (lock == NULL)
1796                 return;
1797
1798         ldlm_lock_dump(D_OTHER, lock, 0);
1799
1800         LDLM_LOCK_PUT(lock);
1801 }
1802
1803 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
1804                       struct libcfs_debug_msg_data *data, const char *fmt,
1805                       ...)
1806 {
1807         va_list args;
1808         cfs_debug_limit_state_t *cdls = data->msg_cdls;
1809
1810         va_start(args, fmt);
1811         if (lock->l_resource == NULL) {
1812                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1813                                    data->msg_fn, data->msg_line, fmt, args,
1814                                    " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1815                                    "res: \?\? rrc=\?\? type: \?\?\? flags: "LPX64" remote: "
1816                                    LPX64" expref: %d pid: %u timeout: %lu\n", lock,
1817                                    lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1818                                    lock->l_readers, lock->l_writers,
1819                                    ldlm_lockname[lock->l_granted_mode],
1820                                    ldlm_lockname[lock->l_req_mode],
1821                                    lock->l_flags, lock->l_remote_handle.cookie,
1822                                    lock->l_export ?
1823                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1824                                    lock->l_pid, lock->l_callback_timeout);
1825                 va_end(args);
1826                 return;
1827         }
1828
1829         switch (lock->l_resource->lr_type) {
1830         case LDLM_EXTENT:
1831                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1832                                    data->msg_fn, data->msg_line, fmt, args,
1833                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1834                                    "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
1835                                    "] (req "LPU64"->"LPU64") flags: "LPX64" remote: "LPX64
1836                                     " expref: %d pid: %u timeout %lu\n",
1837                                     lock->l_resource->lr_namespace->ns_name, lock,
1838                                     lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1839                                     lock->l_readers, lock->l_writers,
1840                                     ldlm_lockname[lock->l_granted_mode],
1841                                     ldlm_lockname[lock->l_req_mode],
1842                                     lock->l_resource->lr_name.name[0],
1843                                     lock->l_resource->lr_name.name[1],
1844                                     atomic_read(&lock->l_resource->lr_refcount),
1845                                     ldlm_typename[lock->l_resource->lr_type],
1846                                     lock->l_policy_data.l_extent.start,
1847                                     lock->l_policy_data.l_extent.end,
1848                                     lock->l_req_extent.start, lock->l_req_extent.end,
1849                                     lock->l_flags, lock->l_remote_handle.cookie,
1850                                     lock->l_export ?
1851                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1852                                     lock->l_pid, lock->l_callback_timeout);
1853                 break;
1854         case LDLM_FLOCK:
1855                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1856                                    data->msg_fn, data->msg_line, fmt, args,
1857                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1858                                    "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "
1859                                    "["LPU64"->"LPU64"] flags: "LPX64" remote: "LPX64
1860                                    " expref: %d pid: %u timeout: %lu\n",
1861                                    lock->l_resource->lr_namespace->ns_name, lock,
1862                                    lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1863                                    lock->l_readers, lock->l_writers,
1864                                    ldlm_lockname[lock->l_granted_mode],
1865                                    ldlm_lockname[lock->l_req_mode],
1866                                    lock->l_resource->lr_name.name[0],
1867                                    lock->l_resource->lr_name.name[1],
1868                                    atomic_read(&lock->l_resource->lr_refcount),
1869                                    ldlm_typename[lock->l_resource->lr_type],
1870                                    lock->l_policy_data.l_flock.pid,
1871                                    lock->l_policy_data.l_flock.start,
1872                                    lock->l_policy_data.l_flock.end,
1873                                    lock->l_flags, lock->l_remote_handle.cookie,
1874                                    lock->l_export ?
1875                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1876                                    lock->l_pid, lock->l_callback_timeout);
1877                 break;
1878         case LDLM_IBITS:
1879                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1880                                    data->msg_fn, data->msg_line, fmt, args,
1881                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1882                                    "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
1883                                    "flags: "LPX64" remote: "LPX64" expref: %d "
1884                                    "pid: %u timeout: %lu\n",
1885                                    lock->l_resource->lr_namespace->ns_name,
1886                                    lock, lock->l_handle.h_cookie,
1887                                    atomic_read (&lock->l_refc),
1888                                    lock->l_readers, lock->l_writers,
1889                                    ldlm_lockname[lock->l_granted_mode],
1890                                    ldlm_lockname[lock->l_req_mode],
1891                                    lock->l_resource->lr_name.name[0],
1892                                    lock->l_resource->lr_name.name[1],
1893                                    lock->l_policy_data.l_inodebits.bits,
1894                                    atomic_read(&lock->l_resource->lr_refcount),
1895                                    ldlm_typename[lock->l_resource->lr_type],
1896                                    lock->l_flags, lock->l_remote_handle.cookie,
1897                                    lock->l_export ?
1898                                         atomic_read(&lock->l_export->exp_refcount) : -99,
1899                                    lock->l_pid, lock->l_callback_timeout);
1900                 break;
1901         default:
1902                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1903                                    data->msg_fn, data->msg_line, fmt, args,
1904                                    " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1905                                    "res: "LPU64"/"LPU64" rrc: %d type: %s flags: "LPX64" "
1906                                    "remote: "LPX64" expref: %d pid: %u timeout %lu\n",
1907                                    lock->l_resource->lr_namespace->ns_name,
1908                                    lock, lock->l_handle.h_cookie,
1909                                    atomic_read (&lock->l_refc),
1910                                    lock->l_readers, lock->l_writers,
1911                                    ldlm_lockname[lock->l_granted_mode],
1912                                    ldlm_lockname[lock->l_req_mode],
1913                                    lock->l_resource->lr_name.name[0],
1914                                    lock->l_resource->lr_name.name[1],
1915                                    atomic_read(&lock->l_resource->lr_refcount),
1916                                    ldlm_typename[lock->l_resource->lr_type],
1917                                    lock->l_flags, lock->l_remote_handle.cookie,
1918                                    lock->l_export ?
1919                                          atomic_read(&lock->l_export->exp_refcount) : -99,
1920                                    lock->l_pid, lock->l_callback_timeout);
1921                 break;
1922         }
1923         va_end(args);
1924 }
1925 EXPORT_SYMBOL(_ldlm_lock_debug);