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 # ifndef HAVE_VFS_INTENT_PATCHES
  47 # include <linux/lustre_intent.h>
  48 # endif
  49 #else
  50 # include <liblustre.h>
  51 #endif
  52
  53 #include <obd_class.h>
  54 #include "ldlm_internal.h"
  55
  56 /* lock types */
  57 char *ldlm_lockname[] = {
  58         [0] "--",
  59         [LCK_EX] "EX",
  60         [LCK_PW] "PW",
  61         [LCK_PR] "PR",
  62         [LCK_CW] "CW",
  63         [LCK_CR] "CR",
  64         [LCK_NL] "NL",
  65         [LCK_GROUP] "GROUP",
  66         [LCK_COS] "COS"
  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         cfs_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(cfs_atomic_read(&lock->l_refc) > 0);
 151         if (cfs_atomic_dec_and_test(&lock->l_refc)) {
 152                 struct ldlm_resource *res;
 153
 154                 LDLM_DEBUG(lock,
 155                            "final lock_put on destroyed lock, freeing it.");
 156
 157                 res = lock->l_resource;
 158                 LASSERT(lock->l_destroyed);
 159                 LASSERT(cfs_list_empty(&lock->l_res_link));
 160                 LASSERT(cfs_list_empty(&lock->l_pending_chain));
 161
 162                 cfs_atomic_dec(&res->lr_namespace->ns_locks);
 163                 lu_ref_del(&res->lr_reference, "lock", lock);
 164                 ldlm_resource_putref(res);
 165                 lock->l_resource = NULL;
 166                 if (lock->l_export) {
 167                         class_export_lock_put(lock->l_export, lock);
 168                         lock->l_export = NULL;
 169                 }
 170
 171                 if (lock->l_lvb_data != NULL)
 172                         OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
 173
 174                 ldlm_interval_free(ldlm_interval_detach(lock));
 175                 lu_ref_fini(&lock->l_reference);
 176                 OBD_FREE_RCU_CB(lock, sizeof(*lock), &lock->l_handle,
 177                                 ldlm_lock_free);
 178         }
 179
 180         EXIT;
 181 }
 182
 183 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
 184 {
 185         int rc = 0;
 186         if (!cfs_list_empty(&lock->l_lru)) {
 187                 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 188                 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 189                 cfs_list_del_init(&lock->l_lru);
 190                 LASSERT(ns->ns_nr_unused > 0);
 191                 ns->ns_nr_unused--;
 192                 rc = 1;
 193         }
 194         return rc;
 195 }
 196
 197 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
 198 {
 199         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 200         int rc;
 201         ENTRY;
 202         cfs_spin_lock(&ns->ns_unused_lock);
 203         rc = ldlm_lock_remove_from_lru_nolock(lock);
 204         cfs_spin_unlock(&ns->ns_unused_lock);
 205         EXIT;
 206         return rc;
 207 }
 208
 209 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
 210 {
 211         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 212         lock->l_last_used = cfs_time_current();
 213         LASSERT(cfs_list_empty(&lock->l_lru));
 214         LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 215         cfs_list_add_tail(&lock->l_lru, &ns->ns_unused_list);
 216         LASSERT(ns->ns_nr_unused >= 0);
 217         ns->ns_nr_unused++;
 218 }
 219
 220 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
 221 {
 222         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 223         ENTRY;
 224         cfs_spin_lock(&ns->ns_unused_lock);
 225         ldlm_lock_add_to_lru_nolock(lock);
 226         cfs_spin_unlock(&ns->ns_unused_lock);
 227         EXIT;
 228 }
 229
 230 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
 231 {
 232         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 233         ENTRY;
 234         cfs_spin_lock(&ns->ns_unused_lock);
 235         if (!cfs_list_empty(&lock->l_lru)) {
 236                 ldlm_lock_remove_from_lru_nolock(lock);
 237                 ldlm_lock_add_to_lru_nolock(lock);
 238         }
 239         cfs_spin_unlock(&ns->ns_unused_lock);
 240         EXIT;
 241 }
 242
 243 /* This used to have a 'strict' flag, which recovery would use to mark an
 244  * in-use lock as needing-to-die.  Lest I am ever tempted to put it back, I
 245  * shall explain why it's gone: with the new hash table scheme, once you call
 246  * ldlm_lock_destroy, you can never drop your final references on this lock.
 247  * Because it's not in the hash table anymore.  -phil */
 248 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
 249 {
 250         ENTRY;
 251
 252         if (lock->l_readers || lock->l_writers) {
 253                 LDLM_ERROR(lock, "lock still has references");
 254                 ldlm_lock_dump(D_ERROR, lock, 0);
 255                 LBUG();
 256         }
 257
 258         if (!cfs_list_empty(&lock->l_res_link)) {
 259                 LDLM_ERROR(lock, "lock still on resource");
 260                 ldlm_lock_dump(D_ERROR, lock, 0);
 261                 LBUG();
 262         }
 263
 264         if (lock->l_destroyed) {
 265                 LASSERT(cfs_list_empty(&lock->l_lru));
 266                 EXIT;
 267                 return 0;
 268         }
 269         lock->l_destroyed = 1;
 270
 271         if (lock->l_export && lock->l_export->exp_lock_hash &&
 272             !cfs_hlist_unhashed(&lock->l_exp_hash))
 273                 cfs_hash_del(lock->l_export->exp_lock_hash,
 274                              &lock->l_remote_handle, &lock->l_exp_hash);
 275
 276         ldlm_lock_remove_from_lru(lock);
 277         class_handle_unhash(&lock->l_handle);
 278
 279 #if 0
 280         /* Wake anyone waiting for this lock */
 281         /* FIXME: I should probably add yet another flag, instead of using
 282          * l_export to only call this on clients */
 283         if (lock->l_export)
 284                 class_export_put(lock->l_export);
 285         lock->l_export = NULL;
 286         if (lock->l_export && lock->l_completion_ast)
 287                 lock->l_completion_ast(lock, 0);
 288 #endif
 289         EXIT;
 290         return 1;
 291 }
 292
 293 void ldlm_lock_destroy(struct ldlm_lock *lock)
 294 {
 295         int first;
 296         ENTRY;
 297         lock_res_and_lock(lock);
 298         first = ldlm_lock_destroy_internal(lock);
 299         unlock_res_and_lock(lock);
 300
 301         /* drop reference from hashtable only for first destroy */
 302         if (first) {
 303                 lu_ref_del(&lock->l_reference, "hash", lock);
 304                 LDLM_LOCK_RELEASE(lock);
 305         }
 306         EXIT;
 307 }
 308
 309 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
 310 {
 311         int first;
 312         ENTRY;
 313         first = ldlm_lock_destroy_internal(lock);
 314         /* drop reference from hashtable only for first destroy */
 315         if (first) {
 316                 lu_ref_del(&lock->l_reference, "hash", lock);
 317                 LDLM_LOCK_RELEASE(lock);
 318         }
 319         EXIT;
 320 }
 321
 322 /* this is called by portals_handle2object with the handle lock taken */
 323 static void lock_handle_addref(void *lock)
 324 {
 325         LDLM_LOCK_GET((struct ldlm_lock *)lock);
 326 }
 327
 328 /*
 329  * usage: pass in a resource on which you have done ldlm_resource_get
 330  *        pass in a parent lock on which you have done a ldlm_lock_get
 331  *        after return, ldlm_*_put the resource and parent
 332  * returns: lock with refcount 2 - one for current caller and one for remote
 333  */
 334 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
 335 {
 336         struct ldlm_lock *lock;
 337         ENTRY;
 338
 339         if (resource == NULL)
 340                 LBUG();
 341
 342         OBD_SLAB_ALLOC_PTR_GFP(lock, ldlm_lock_slab, CFS_ALLOC_IO);
 343         if (lock == NULL)
 344                 RETURN(NULL);
 345
 346         cfs_spin_lock_init(&lock->l_lock);
 347         lock->l_resource = ldlm_resource_getref(resource);
 348         lu_ref_add(&resource->lr_reference, "lock", lock);
 349
 350         cfs_atomic_set(&lock->l_refc, 2);
 351         CFS_INIT_LIST_HEAD(&lock->l_res_link);
 352         CFS_INIT_LIST_HEAD(&lock->l_lru);
 353         CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
 354         CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
 355         CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
 356         CFS_INIT_LIST_HEAD(&lock->l_rk_ast);
 357         cfs_waitq_init(&lock->l_waitq);
 358         lock->l_blocking_lock = NULL;
 359         CFS_INIT_LIST_HEAD(&lock->l_sl_mode);
 360         CFS_INIT_LIST_HEAD(&lock->l_sl_policy);
 361         CFS_INIT_HLIST_NODE(&lock->l_exp_hash);
 362
 363         cfs_atomic_inc(&resource->lr_namespace->ns_locks);
 364         CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
 365         class_handle_hash(&lock->l_handle, lock_handle_addref);
 366
 367         CFS_INIT_LIST_HEAD(&lock->l_extents_list);
 368         cfs_spin_lock_init(&lock->l_extents_list_lock);
 369         CFS_INIT_LIST_HEAD(&lock->l_cache_locks_list);
 370         lu_ref_init(&lock->l_reference);
 371         lu_ref_add(&lock->l_reference, "hash", lock);
 372         lock->l_callback_timeout = 0;
 373
 374 #if LUSTRE_TRACKS_LOCK_EXP_REFS
 375         CFS_INIT_LIST_HEAD(&lock->l_exp_refs_link);
 376         lock->l_exp_refs_nr = 0;
 377         lock->l_exp_refs_target = NULL;
 378 #endif
 379
 380         RETURN(lock);
 381 }
 382
 383 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
 384                               const struct ldlm_res_id *new_resid)
 385 {
 386         struct ldlm_resource *oldres = lock->l_resource;
 387         struct ldlm_resource *newres;
 388         int type;
 389         ENTRY;
 390
 391         LASSERT(ns_is_client(ns));
 392
 393         lock_res_and_lock(lock);
 394         if (memcmp(new_resid, &lock->l_resource->lr_name,
 395                    sizeof(lock->l_resource->lr_name)) == 0) {
 396                 /* Nothing to do */
 397                 unlock_res_and_lock(lock);
 398                 RETURN(0);
 399         }
 400
 401         LASSERT(new_resid->name[0] != 0);
 402
 403         /* This function assumes that the lock isn't on any lists */
 404         LASSERT(cfs_list_empty(&lock->l_res_link));
 405
 406         type = oldres->lr_type;
 407         unlock_res_and_lock(lock);
 408
 409         newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
 410         lu_ref_add(&newres->lr_reference, "lock", lock);
 411         if (newres == NULL)
 412                 RETURN(-ENOMEM);
 413         /*
 414          * To flip the lock from the old to the new resource, lock, oldres and
 415          * newres have to be locked. Resource spin-locks are nested within
 416          * lock->l_lock, and are taken in the memory address order to avoid
 417          * dead-locks.
 418          */
 419         cfs_spin_lock(&lock->l_lock);
 420         oldres = lock->l_resource;
 421         if (oldres < newres) {
 422                 lock_res(oldres);
 423                 lock_res_nested(newres, LRT_NEW);
 424         } else {
 425                 lock_res(newres);
 426                 lock_res_nested(oldres, LRT_NEW);
 427         }
 428         LASSERT(memcmp(new_resid, &oldres->lr_name,
 429                        sizeof oldres->lr_name) != 0);
 430         lock->l_resource = newres;
 431         unlock_res(oldres);
 432         unlock_res_and_lock(lock);
 433
 434         /* ...and the flowers are still standing! */
 435         lu_ref_del(&oldres->lr_reference, "lock", lock);
 436         ldlm_resource_putref(oldres);
 437
 438         RETURN(0);
 439 }
 440
 441 /*
 442  *  HANDLES
 443  */
 444
 445 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
 446 {
 447         lockh->cookie = lock->l_handle.h_cookie;
 448 }
 449
 450 /* if flags: atomically get the lock and set the flags.
 451  *           Return NULL if flag already set
 452  */
 453
 454 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
 455                                      int flags)
 456 {
 457         struct ldlm_namespace *ns;
 458         struct ldlm_lock *lock, *retval = NULL;
 459         ENTRY;
 460
 461         LASSERT(handle);
 462
 463         lock = class_handle2object(handle->cookie);
 464         if (lock == NULL)
 465                 RETURN(NULL);
 466
 467         LASSERT(lock->l_resource != NULL);
 468         ns = lock->l_resource->lr_namespace;
 469         LASSERT(ns != NULL);
 470
 471         lu_ref_add_atomic(&lock->l_reference, "handle", cfs_current());
 472         lock_res_and_lock(lock);
 473
 474         /* It's unlikely but possible that someone marked the lock as
 475          * destroyed after we did handle2object on it */
 476         if (lock->l_destroyed) {
 477                 unlock_res_and_lock(lock);
 478                 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
 479                 LDLM_LOCK_PUT(lock);
 480                 GOTO(out, retval);
 481         }
 482
 483         if (flags && (lock->l_flags & flags)) {
 484                 unlock_res_and_lock(lock);
 485                 LDLM_LOCK_PUT(lock);
 486                 GOTO(out, retval);
 487         }
 488
 489         if (flags)
 490                 lock->l_flags |= flags;
 491
 492         unlock_res_and_lock(lock);
 493         retval = lock;
 494         EXIT;
 495  out:
 496         return retval;
 497 }
 498
 499 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 500 {
 501         struct obd_export *exp = lock->l_export?:lock->l_conn_export;
 502         /* INODEBITS_INTEROP: If the other side does not support
 503          * inodebits, reply with a plain lock descriptor.
 504          */
 505         if ((lock->l_resource->lr_type == LDLM_IBITS) &&
 506             (exp && !(exp->exp_connect_flags & OBD_CONNECT_IBITS))) {
 507                 /* Make sure all the right bits are set in this lock we
 508                    are going to pass to client */
 509                 LASSERTF(lock->l_policy_data.l_inodebits.bits ==
 510                          (MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE),
 511                          "Inappropriate inode lock bits during "
 512                          "conversion " LPU64 "\n",
 513                          lock->l_policy_data.l_inodebits.bits);
 514
 515                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 516                 desc->l_resource.lr_type = LDLM_PLAIN;
 517
 518                 /* Convert "new" lock mode to something old client can
 519                    understand */
 520                 if ((lock->l_req_mode == LCK_CR) ||
 521                     (lock->l_req_mode == LCK_CW))
 522                         desc->l_req_mode = LCK_PR;
 523                 else
 524                         desc->l_req_mode = lock->l_req_mode;
 525                 if ((lock->l_granted_mode == LCK_CR) ||
 526                     (lock->l_granted_mode == LCK_CW)) {
 527                         desc->l_granted_mode = LCK_PR;
 528                 } else {
 529                         /* We never grant PW/EX locks to clients */
 530                         LASSERT((lock->l_granted_mode != LCK_PW) &&
 531                                 (lock->l_granted_mode != LCK_EX));
 532                         desc->l_granted_mode = lock->l_granted_mode;
 533                 }
 534
 535                 /* We do not copy policy here, because there is no
 536                    policy for plain locks */
 537         } else {
 538                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 539                 desc->l_req_mode = lock->l_req_mode;
 540                 desc->l_granted_mode = lock->l_granted_mode;
 541                 desc->l_policy_data = lock->l_policy_data;
 542         }
 543 }
 544
 545 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 546                            cfs_list_t *work_list)
 547 {
 548         if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
 549                 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
 550                 lock->l_flags |= LDLM_FL_AST_SENT;
 551                 /* If the enqueuing client said so, tell the AST recipient to
 552                  * discard dirty data, rather than writing back. */
 553                 if (new->l_flags & LDLM_AST_DISCARD_DATA)
 554                         lock->l_flags |= LDLM_FL_DISCARD_DATA;
 555                 LASSERT(cfs_list_empty(&lock->l_bl_ast));
 556                 cfs_list_add(&lock->l_bl_ast, work_list);
 557                 LDLM_LOCK_GET(lock);
 558                 LASSERT(lock->l_blocking_lock == NULL);
 559                 lock->l_blocking_lock = LDLM_LOCK_GET(new);
 560         }
 561 }
 562
 563 void ldlm_add_cp_work_item(struct ldlm_lock *lock, cfs_list_t *work_list)
 564 {
 565         if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
 566                 lock->l_flags |= LDLM_FL_CP_REQD;
 567                 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
 568                 LASSERT(cfs_list_empty(&lock->l_cp_ast));
 569                 cfs_list_add(&lock->l_cp_ast, work_list);
 570                 LDLM_LOCK_GET(lock);
 571         }
 572 }
 573
 574 /* must be called with lr_lock held */
 575 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 576                             cfs_list_t *work_list)
 577 {
 578         ENTRY;
 579         check_res_locked(lock->l_resource);
 580         if (new)
 581                 ldlm_add_bl_work_item(lock, new, work_list);
 582         else
 583                 ldlm_add_cp_work_item(lock, work_list);
 584         EXIT;
 585 }
 586
 587 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
 588 {
 589         struct ldlm_lock *lock;
 590
 591         lock = ldlm_handle2lock(lockh);
 592         LASSERT(lock != NULL);
 593         ldlm_lock_addref_internal(lock, mode);
 594         LDLM_LOCK_PUT(lock);
 595 }
 596
 597 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 598 {
 599         ldlm_lock_remove_from_lru(lock);
 600         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 601                 lock->l_readers++;
 602                 lu_ref_add_atomic(&lock->l_reference, "reader", lock);
 603         }
 604         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
 605                 lock->l_writers++;
 606                 lu_ref_add_atomic(&lock->l_reference, "writer", lock);
 607         }
 608         LDLM_LOCK_GET(lock);
 609         lu_ref_add_atomic(&lock->l_reference, "user", lock);
 610         LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
 611 }
 612
 613 /**
 614  * Attempts to addref a lock, and fails if lock is already LDLM_FL_CBPENDING
 615  * or destroyed.
 616  *
 617  * \retval 0 success, lock was addref-ed
 618  *
 619  * \retval -EAGAIN lock is being canceled.
 620  */
 621 int ldlm_lock_addref_try(struct lustre_handle *lockh, __u32 mode)
 622 {
 623         struct ldlm_lock *lock;
 624         int               result;
 625
 626         result = -EAGAIN;
 627         lock = ldlm_handle2lock(lockh);
 628         if (lock != NULL) {
 629                 lock_res_and_lock(lock);
 630                 if (lock->l_readers != 0 || lock->l_writers != 0 ||
 631                     !(lock->l_flags & LDLM_FL_CBPENDING)) {
 632                         ldlm_lock_addref_internal_nolock(lock, mode);
 633                         result = 0;
 634                 }
 635                 unlock_res_and_lock(lock);
 636                 LDLM_LOCK_PUT(lock);
 637         }
 638         return result;
 639 }
 640
 641 /* only called for local locks */
 642 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
 643 {
 644         lock_res_and_lock(lock);
 645         ldlm_lock_addref_internal_nolock(lock, mode);
 646         unlock_res_and_lock(lock);
 647 }
 648
 649 /* only called in ldlm_flock_destroy and for local locks.
 650  *  * for LDLM_FLOCK type locks, l_blocking_ast is null, and
 651  *   * ldlm_lock_remove_from_lru() does nothing, it is safe
 652  *    * for ldlm_flock_destroy usage by dropping some code */
 653 void ldlm_lock_decref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 654 {
 655         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 656         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 657                 LASSERT(lock->l_readers > 0);
 658                 lu_ref_del(&lock->l_reference, "reader", lock);
 659                 lock->l_readers--;
 660         }
 661         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP | LCK_COS)) {
 662                 LASSERT(lock->l_writers > 0);
 663                 lu_ref_del(&lock->l_reference, "writer", lock);
 664                 lock->l_writers--;
 665         }
 666
 667         lu_ref_del(&lock->l_reference, "user", lock);
 668         LDLM_LOCK_RELEASE(lock);    /* matches the LDLM_LOCK_GET() in addref */
 669 }
 670
 671 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
 672 {
 673         struct ldlm_namespace *ns;
 674         ENTRY;
 675
 676         lock_res_and_lock(lock);
 677
 678         ns = lock->l_resource->lr_namespace;
 679
 680         ldlm_lock_decref_internal_nolock(lock, mode);
 681
 682         if (lock->l_flags & LDLM_FL_LOCAL &&
 683             !lock->l_readers && !lock->l_writers) {
 684                 /* If this is a local lock on a server namespace and this was
 685                  * the last reference, cancel the lock. */
 686                 CDEBUG(D_INFO, "forcing cancel of local lock\n");
 687                 lock->l_flags |= LDLM_FL_CBPENDING;
 688         }
 689
 690         if (!lock->l_readers && !lock->l_writers &&
 691             (lock->l_flags & LDLM_FL_CBPENDING)) {
 692                 /* If we received a blocked AST and this was the last reference,
 693                  * run the callback. */
 694                 if (ns_is_server(ns) && lock->l_export)
 695                         CERROR("FL_CBPENDING set on non-local lock--just a "
 696                                "warning\n");
 697
 698                 LDLM_DEBUG(lock, "final decref done on cbpending lock");
 699
 700                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 701                 ldlm_lock_remove_from_lru(lock);
 702                 unlock_res_and_lock(lock);
 703
 704                 if (lock->l_flags & LDLM_FL_FAIL_LOC)
 705                         OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
 706
 707                 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
 708                     ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
 709                         ldlm_handle_bl_callback(ns, NULL, lock);
 710         } else if (ns_is_client(ns) &&
 711                    !lock->l_readers && !lock->l_writers &&
 712                    !(lock->l_flags & LDLM_FL_BL_AST)) {
 713                 /* If this is a client-side namespace and this was the last
 714                  * reference, put it on the LRU. */
 715                 ldlm_lock_add_to_lru(lock);
 716                 unlock_res_and_lock(lock);
 717
 718                 if (lock->l_flags & LDLM_FL_FAIL_LOC)
 719                         OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
 720
 721                 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
 722                  * are not supported by the server, otherwise, it is done on
 723                  * enqueue. */
 724                 if (!exp_connect_cancelset(lock->l_conn_export) &&
 725                     !ns_connect_lru_resize(ns))
 726                         ldlm_cancel_lru(ns, 0, LDLM_ASYNC, 0);
 727         } else {
 728                 unlock_res_and_lock(lock);
 729         }
 730
 731         EXIT;
 732 }
 733
 734 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
 735 {
 736         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 737         LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
 738         ldlm_lock_decref_internal(lock, mode);
 739         LDLM_LOCK_PUT(lock);
 740 }
 741
 742 /* This will drop a lock reference and mark it for destruction, but will not
 743  * necessarily cancel the lock before returning. */
 744 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
 745 {
 746         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 747         ENTRY;
 748
 749         LASSERT(lock != NULL);
 750
 751         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 752         lock_res_and_lock(lock);
 753         lock->l_flags |= LDLM_FL_CBPENDING;
 754         unlock_res_and_lock(lock);
 755         ldlm_lock_decref_internal(lock, mode);
 756         LDLM_LOCK_PUT(lock);
 757 }
 758
 759 struct sl_insert_point {
 760         cfs_list_t *res_link;
 761         cfs_list_t *mode_link;
 762         cfs_list_t *policy_link;
 763 };
 764
 765 /*
 766  * search_granted_lock
 767  *
 768  * Description:
 769  *      Finds a position to insert the new lock.
 770  * Parameters:
 771  *      queue [input]:  the granted list where search acts on;
 772  *      req [input]:    the lock whose position to be located;
 773  *      prev [output]:  positions within 3 lists to insert @req to
 774  * Return Value:
 775  *      filled @prev
 776  * NOTE: called by
 777  *  - ldlm_grant_lock_with_skiplist
 778  */
 779 static void search_granted_lock(cfs_list_t *queue,
 780                                 struct ldlm_lock *req,
 781                                 struct sl_insert_point *prev)
 782 {
 783         cfs_list_t *tmp;
 784         struct ldlm_lock *lock, *mode_end, *policy_end;
 785         ENTRY;
 786
 787         cfs_list_for_each(tmp, queue) {
 788                 lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
 789
 790                 mode_end = cfs_list_entry(lock->l_sl_mode.prev,
 791                                           struct ldlm_lock, l_sl_mode);
 792
 793                 if (lock->l_req_mode != req->l_req_mode) {
 794                         /* jump to last lock of mode group */
 795                         tmp = &mode_end->l_res_link;
 796                         continue;
 797                 }
 798
 799                 /* suitable mode group is found */
 800                 if (lock->l_resource->lr_type == LDLM_PLAIN) {
 801                         /* insert point is last lock of the mode group */
 802                         prev->res_link = &mode_end->l_res_link;
 803                         prev->mode_link = &mode_end->l_sl_mode;
 804                         prev->policy_link = &req->l_sl_policy;
 805                         EXIT;
 806                         return;
 807                 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
 808                         for (;;) {
 809                                 policy_end =
 810                                         cfs_list_entry(lock->l_sl_policy.prev,
 811                                                        struct ldlm_lock,
 812                                                        l_sl_policy);
 813
 814                                 if (lock->l_policy_data.l_inodebits.bits ==
 815                                     req->l_policy_data.l_inodebits.bits) {
 816                                         /* insert point is last lock of
 817                                          * the policy group */
 818                                         prev->res_link =
 819                                                 &policy_end->l_res_link;
 820                                         prev->mode_link =
 821                                                 &policy_end->l_sl_mode;
 822                                         prev->policy_link =
 823                                                 &policy_end->l_sl_policy;
 824                                         EXIT;
 825                                         return;
 826                                 }
 827
 828                                 if (policy_end == mode_end)
 829                                         /* done with mode group */
 830                                         break;
 831
 832                                 /* go to next policy group within mode group */
 833                                 tmp = policy_end->l_res_link.next;
 834                                 lock = cfs_list_entry(tmp, struct ldlm_lock,
 835                                                       l_res_link);
 836                         }  /* loop over policy groups within the mode group */
 837
 838                         /* insert point is last lock of the mode group,
 839                          * new policy group is started */
 840                         prev->res_link = &mode_end->l_res_link;
 841                         prev->mode_link = &mode_end->l_sl_mode;
 842                         prev->policy_link = &req->l_sl_policy;
 843                         EXIT;
 844                         return;
 845                 } else {
 846                         LDLM_ERROR(lock,"is not LDLM_PLAIN or LDLM_IBITS lock");
 847                         LBUG();
 848                 }
 849         }
 850
 851         /* insert point is last lock on the queue,
 852          * new mode group and new policy group are started */
 853         prev->res_link = queue->prev;
 854         prev->mode_link = &req->l_sl_mode;
 855         prev->policy_link = &req->l_sl_policy;
 856         EXIT;
 857         return;
 858 }
 859
 860 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
 861                                        struct sl_insert_point *prev)
 862 {
 863         struct ldlm_resource *res = lock->l_resource;
 864         ENTRY;
 865
 866         check_res_locked(res);
 867
 868         ldlm_resource_dump(D_INFO, res);
 869         CDEBUG(D_OTHER, "About to add this lock:\n");
 870         ldlm_lock_dump(D_OTHER, lock, 0);
 871
 872         if (lock->l_destroyed) {
 873                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
 874                 return;
 875         }
 876
 877         LASSERT(cfs_list_empty(&lock->l_res_link));
 878         LASSERT(cfs_list_empty(&lock->l_sl_mode));
 879         LASSERT(cfs_list_empty(&lock->l_sl_policy));
 880
 881         cfs_list_add(&lock->l_res_link, prev->res_link);
 882         cfs_list_add(&lock->l_sl_mode, prev->mode_link);
 883         cfs_list_add(&lock->l_sl_policy, prev->policy_link);
 884
 885         EXIT;
 886 }
 887
 888 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
 889 {
 890         struct sl_insert_point prev;
 891         ENTRY;
 892
 893         LASSERT(lock->l_req_mode == lock->l_granted_mode);
 894
 895         search_granted_lock(&lock->l_resource->lr_granted, lock, &prev);
 896         ldlm_granted_list_add_lock(lock, &prev);
 897         EXIT;
 898 }
 899
 900 /* NOTE: called by
 901  *  - ldlm_lock_enqueue
 902  *  - ldlm_reprocess_queue
 903  *  - ldlm_lock_convert
 904  *
 905  * must be called with lr_lock held
 906  */
 907 void ldlm_grant_lock(struct ldlm_lock *lock, cfs_list_t *work_list)
 908 {
 909         struct ldlm_resource *res = lock->l_resource;
 910         ENTRY;
 911
 912         check_res_locked(res);
 913
 914         lock->l_granted_mode = lock->l_req_mode;
 915         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
 916                 ldlm_grant_lock_with_skiplist(lock);
 917         else if (res->lr_type == LDLM_EXTENT)
 918                 ldlm_extent_add_lock(res, lock);
 919         else
 920                 ldlm_resource_add_lock(res, &res->lr_granted, lock);
 921
 922         if (lock->l_granted_mode < res->lr_most_restr)
 923                 res->lr_most_restr = lock->l_granted_mode;
 924
 925         if (work_list && lock->l_completion_ast != NULL)
 926                 ldlm_add_ast_work_item(lock, NULL, work_list);
 927
 928         ldlm_pool_add(&res->lr_namespace->ns_pool, lock);
 929         EXIT;
 930 }
 931
 932 /* returns a referenced lock or NULL.  See the flag descriptions below, in the
 933  * comment above ldlm_lock_match */
 934 static struct ldlm_lock *search_queue(cfs_list_t *queue,
 935                                       ldlm_mode_t *mode,
 936                                       ldlm_policy_data_t *policy,
 937                                       struct ldlm_lock *old_lock,
 938                                       int flags, int unref)
 939 {
 940         struct ldlm_lock *lock;
 941         cfs_list_t       *tmp;
 942
 943         cfs_list_for_each(tmp, queue) {
 944                 ldlm_mode_t match;
 945
 946                 lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
 947
 948                 if (lock == old_lock)
 949                         break;
 950
 951                 /* llite sometimes wants to match locks that will be
 952                  * canceled when their users drop, but we allow it to match
 953                  * if it passes in CBPENDING and the lock still has users.
 954                  * this is generally only going to be used by children
 955                  * whose parents already hold a lock so forward progress
 956                  * can still happen. */
 957                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 958                     !(flags & LDLM_FL_CBPENDING))
 959                         continue;
 960                 if (!unref && lock->l_flags & LDLM_FL_CBPENDING &&
 961                     lock->l_readers == 0 && lock->l_writers == 0)
 962                         continue;
 963
 964                 if (!(lock->l_req_mode & *mode))
 965                         continue;
 966                 match = lock->l_req_mode;
 967
 968                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 969                     (lock->l_policy_data.l_extent.start >
 970                      policy->l_extent.start ||
 971                      lock->l_policy_data.l_extent.end < policy->l_extent.end))
 972                         continue;
 973
 974                 if (unlikely(match == LCK_GROUP) &&
 975                     lock->l_resource->lr_type == LDLM_EXTENT &&
 976                     lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
 977                         continue;
 978
 979                 /* We match if we have existing lock with same or wider set
 980                    of bits. */
 981                 if (lock->l_resource->lr_type == LDLM_IBITS &&
 982                      ((lock->l_policy_data.l_inodebits.bits &
 983                       policy->l_inodebits.bits) !=
 984                       policy->l_inodebits.bits))
 985                         continue;
 986
 987                 if (!unref &&
 988                     (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED)))
 989                         continue;
 990
 991                 if ((flags & LDLM_FL_LOCAL_ONLY) &&
 992                     !(lock->l_flags & LDLM_FL_LOCAL))
 993                         continue;
 994
 995                 if (flags & LDLM_FL_TEST_LOCK) {
 996                         LDLM_LOCK_GET(lock);
 997                         ldlm_lock_touch_in_lru(lock);
 998                 } else {
 999                         ldlm_lock_addref_internal_nolock(lock, match);
1000                 }
1001                 *mode = match;
1002                 return lock;
1003         }
1004
1005         return NULL;
1006 }
1007
1008 void ldlm_lock_allow_match_locked(struct ldlm_lock *lock)
1009 {
1010         lock->l_flags |= LDLM_FL_LVB_READY;
1011         cfs_waitq_signal(&lock->l_waitq);
1012 }
1013
1014 void ldlm_lock_allow_match(struct ldlm_lock *lock)
1015 {
1016         lock_res_and_lock(lock);
1017         ldlm_lock_allow_match_locked(lock);
1018         unlock_res_and_lock(lock);
1019 }
1020
1021 /* Can be called in two ways:
1022  *
1023  * If 'ns' is NULL, then lockh describes an existing lock that we want to look
1024  * for a duplicate of.
1025  *
1026  * Otherwise, all of the fields must be filled in, to match against.
1027  *
1028  * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
1029  *     server (ie, connh is NULL)
1030  * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
1031  *     list will be considered
1032  * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
1033  *     to be canceled can still be matched as long as they still have reader
1034  *     or writer refernces
1035  * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
1036  *     just tell us if we would have matched.
1037  *
1038  * Returns 1 if it finds an already-existing lock that is compatible; in this
1039  * case, lockh is filled in with a addref()ed lock
1040  *
1041  * we also check security context, if that failed we simply return 0 (to keep
1042  * caller code unchanged), the context failure will be discovered by caller
1043  * sometime later.
1044  */
1045 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, int flags,
1046                             const struct ldlm_res_id *res_id, ldlm_type_t type,
1047                             ldlm_policy_data_t *policy, ldlm_mode_t mode,
1048                             struct lustre_handle *lockh, int unref)
1049 {
1050         struct ldlm_resource *res;
1051         struct ldlm_lock *lock, *old_lock = NULL;
1052         int rc = 0;
1053         ENTRY;
1054
1055         if (ns == NULL) {
1056                 old_lock = ldlm_handle2lock(lockh);
1057                 LASSERT(old_lock);
1058
1059                 ns = old_lock->l_resource->lr_namespace;
1060                 res_id = &old_lock->l_resource->lr_name;
1061                 type = old_lock->l_resource->lr_type;
1062                 mode = old_lock->l_req_mode;
1063         }
1064
1065         res = ldlm_resource_get(ns, NULL, res_id, type, 0);
1066         if (res == NULL) {
1067                 LASSERT(old_lock == NULL);
1068                 RETURN(0);
1069         }
1070
1071         LDLM_RESOURCE_ADDREF(res);
1072         lock_res(res);
1073
1074         lock = search_queue(&res->lr_granted, &mode, policy, old_lock,
1075                             flags, unref);
1076         if (lock != NULL)
1077                 GOTO(out, rc = 1);
1078         if (flags & LDLM_FL_BLOCK_GRANTED)
1079                 GOTO(out, rc = 0);
1080         lock = search_queue(&res->lr_converting, &mode, policy, old_lock,
1081                             flags, unref);
1082         if (lock != NULL)
1083                 GOTO(out, rc = 1);
1084         lock = search_queue(&res->lr_waiting, &mode, policy, old_lock,
1085                             flags, unref);
1086         if (lock != NULL)
1087                 GOTO(out, rc = 1);
1088
1089         EXIT;
1090  out:
1091         unlock_res(res);
1092         LDLM_RESOURCE_DELREF(res);
1093         ldlm_resource_putref(res);
1094
1095         if (lock) {
1096                 ldlm_lock2handle(lock, lockh);
1097                 if ((flags & LDLM_FL_LVB_READY) &&
1098                     (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1099                         struct l_wait_info lwi;
1100                         if (lock->l_completion_ast) {
1101                                 int err = lock->l_completion_ast(lock,
1102                                                           LDLM_FL_WAIT_NOREPROC,
1103                                                                  NULL);
1104                                 if (err) {
1105                                         if (flags & LDLM_FL_TEST_LOCK)
1106                                                 LDLM_LOCK_RELEASE(lock);
1107                                         else
1108                                                 ldlm_lock_decref_internal(lock,
1109                                                                           mode);
1110                                         rc = 0;
1111                                         goto out2;
1112                                 }
1113                         }
1114
1115                         lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout),
1116                                                NULL, LWI_ON_SIGNAL_NOOP, NULL);
1117
1118                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1119                         l_wait_event(lock->l_waitq,
1120                                      (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1121                 }
1122         }
1123  out2:
1124         if (rc) {
1125                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1126                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1127                                 res_id->name[2] : policy->l_extent.start,
1128                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1129                                 res_id->name[3] : policy->l_extent.end);
1130
1131                 /* check user's security context */
1132                 if (lock->l_conn_export &&
1133                     sptlrpc_import_check_ctx(
1134                                 class_exp2cliimp(lock->l_conn_export))) {
1135                         if (!(flags & LDLM_FL_TEST_LOCK))
1136                                 ldlm_lock_decref_internal(lock, mode);
1137                         rc = 0;
1138                 }
1139
1140                 if (flags & LDLM_FL_TEST_LOCK)
1141                         LDLM_LOCK_RELEASE(lock);
1142
1143         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1144                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1145                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1146                                   type, mode, res_id->name[0], res_id->name[1],
1147                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1148                                         res_id->name[2] :policy->l_extent.start,
1149                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1150                                         res_id->name[3] : policy->l_extent.end);
1151         }
1152         if (old_lock)
1153                 LDLM_LOCK_PUT(old_lock);
1154
1155         return rc ? mode : 0;
1156 }
1157
1158 /* Returns a referenced lock */
1159 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1160                                    const struct ldlm_res_id *res_id,
1161                                    ldlm_type_t type,
1162                                    ldlm_mode_t mode,
1163                                    const struct ldlm_callback_suite *cbs,
1164                                    void *data, __u32 lvb_len)
1165 {
1166         struct ldlm_lock *lock;
1167         struct ldlm_resource *res;
1168         ENTRY;
1169
1170         res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1171         if (res == NULL)
1172                 RETURN(NULL);
1173
1174         lock = ldlm_lock_new(res);
1175         ldlm_resource_putref(res);
1176
1177         if (lock == NULL)
1178                 RETURN(NULL);
1179
1180         lock->l_req_mode = mode;
1181         lock->l_ast_data = data;
1182         lock->l_pid = cfs_curproc_pid();
1183         if (cbs) {
1184                 lock->l_blocking_ast = cbs->lcs_blocking;
1185                 lock->l_completion_ast = cbs->lcs_completion;
1186                 lock->l_glimpse_ast = cbs->lcs_glimpse;
1187                 lock->l_weigh_ast = cbs->lcs_weigh;
1188         }
1189
1190         lock->l_tree_node = NULL;
1191         /* if this is the extent lock, allocate the interval tree node */
1192         if (type == LDLM_EXTENT) {
1193                 if (ldlm_interval_alloc(lock) == NULL)
1194                         GOTO(out, 0);
1195         }
1196
1197         if (lvb_len) {
1198                 lock->l_lvb_len = lvb_len;
1199                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1200                 if (lock->l_lvb_data == NULL)
1201                         GOTO(out, 0);
1202         }
1203
1204         if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_NEW_LOCK))
1205                 GOTO(out, 0);
1206
1207         RETURN(lock);
1208
1209 out:
1210         ldlm_lock_destroy(lock);
1211         LDLM_LOCK_RELEASE(lock);
1212         return NULL;
1213 }
1214
1215 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1216                                struct ldlm_lock **lockp,
1217                                void *cookie, int *flags)
1218 {
1219         struct ldlm_lock *lock = *lockp;
1220         struct ldlm_resource *res = lock->l_resource;
1221         int local = ns_is_client(res->lr_namespace);
1222         ldlm_processing_policy policy;
1223         ldlm_error_t rc = ELDLM_OK;
1224         struct ldlm_interval *node = NULL;
1225         ENTRY;
1226
1227         lock->l_last_activity = cfs_time_current_sec();
1228         /* policies are not executed on the client or during replay */
1229         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1230             && !local && ns->ns_policy) {
1231                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1232                                    NULL);
1233                 if (rc == ELDLM_LOCK_REPLACED) {
1234                         /* The lock that was returned has already been granted,
1235                          * and placed into lockp.  If it's not the same as the
1236                          * one we passed in, then destroy the old one and our
1237                          * work here is done. */
1238                         if (lock != *lockp) {
1239                                 ldlm_lock_destroy(lock);
1240                                 LDLM_LOCK_RELEASE(lock);
1241                         }
1242                         *flags |= LDLM_FL_LOCK_CHANGED;
1243                         RETURN(0);
1244                 } else if (rc != ELDLM_OK ||
1245                            (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1246                         ldlm_lock_destroy(lock);
1247                         RETURN(rc);
1248                 }
1249         }
1250
1251         /* For a replaying lock, it might be already in granted list. So
1252          * unlinking the lock will cause the interval node to be freed, we
1253          * have to allocate the interval node early otherwise we can't regrant
1254          * this lock in the future. - jay */
1255         if (!local && (*flags & LDLM_FL_REPLAY) && res->lr_type == LDLM_EXTENT)
1256                 OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, CFS_ALLOC_IO);
1257
1258         lock_res_and_lock(lock);
1259         if (local && lock->l_req_mode == lock->l_granted_mode) {
1260                 /* The server returned a blocked lock, but it was granted
1261                  * before we got a chance to actually enqueue it.  We don't
1262                  * need to do anything else. */
1263                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1264                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1265                 GOTO(out, ELDLM_OK);
1266         }
1267
1268         ldlm_resource_unlink_lock(lock);
1269         if (res->lr_type == LDLM_EXTENT && lock->l_tree_node == NULL) {
1270                 if (node == NULL) {
1271                         ldlm_lock_destroy_nolock(lock);
1272                         GOTO(out, rc = -ENOMEM);
1273                 }
1274
1275                 CFS_INIT_LIST_HEAD(&node->li_group);
1276                 ldlm_interval_attach(node, lock);
1277                 node = NULL;
1278         }
1279
1280         /* Some flags from the enqueue want to make it into the AST, via the
1281          * lock's l_flags. */
1282         lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1283
1284         /* This distinction between local lock trees is very important; a client
1285          * namespace only has information about locks taken by that client, and
1286          * thus doesn't have enough information to decide for itself if it can
1287          * be granted (below).  In this case, we do exactly what the server
1288          * tells us to do, as dictated by the 'flags'.
1289          *
1290          * We do exactly the same thing during recovery, when the server is
1291          * more or less trusting the clients not to lie.
1292          *
1293          * FIXME (bug 268): Detect obvious lies by checking compatibility in
1294          * granted/converting queues. */
1295         if (local) {
1296                 if (*flags & LDLM_FL_BLOCK_CONV)
1297                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1298                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1299                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1300                 else
1301                         ldlm_grant_lock(lock, NULL);
1302                 GOTO(out, ELDLM_OK);
1303         } else if (*flags & LDLM_FL_REPLAY) {
1304                 if (*flags & LDLM_FL_BLOCK_CONV) {
1305                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1306                         GOTO(out, ELDLM_OK);
1307                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1308                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1309                         GOTO(out, ELDLM_OK);
1310                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1311                         ldlm_grant_lock(lock, NULL);
1312                         GOTO(out, ELDLM_OK);
1313                 }
1314                 /* If no flags, fall through to normal enqueue path. */
1315         }
1316
1317         policy = ldlm_processing_policy_table[res->lr_type];
1318         policy(lock, flags, 1, &rc, NULL);
1319         GOTO(out, rc);
1320 out:
1321         unlock_res_and_lock(lock);
1322         if (node)
1323                 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1324         return rc;
1325 }
1326
1327 /* Must be called with namespace taken: queue is waiting or converting. */
1328 int ldlm_reprocess_queue(struct ldlm_resource *res, cfs_list_t *queue,
1329                          cfs_list_t *work_list)
1330 {
1331         cfs_list_t *tmp, *pos;
1332         ldlm_processing_policy policy;
1333         int flags;
1334         int rc = LDLM_ITER_CONTINUE;
1335         ldlm_error_t err;
1336         ENTRY;
1337
1338         check_res_locked(res);
1339
1340         policy = ldlm_processing_policy_table[res->lr_type];
1341         LASSERT(policy);
1342
1343         cfs_list_for_each_safe(tmp, pos, queue) {
1344                 struct ldlm_lock *pending;
1345                 pending = cfs_list_entry(tmp, struct ldlm_lock, l_res_link);
1346
1347                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1348
1349                 flags = 0;
1350                 rc = policy(pending, &flags, 0, &err, work_list);
1351                 if (rc != LDLM_ITER_CONTINUE)
1352                         break;
1353         }
1354
1355         RETURN(rc);
1356 }
1357
1358 /* Helper function for ldlm_run_ast_work().
1359  *
1360  * Send an existing rpc set specified by @arg->set and then
1361  * destroy it. Create new one if @do_create flag is set. */
1362 static void
1363 ldlm_send_and_maybe_create_set(struct ldlm_cb_set_arg *arg, int do_create)
1364 {
1365         ENTRY;
1366
1367         ptlrpc_set_wait(arg->set);
1368         if (arg->type == LDLM_BL_CALLBACK)
1369                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_GLIMPSE, 2);
1370         ptlrpc_set_destroy(arg->set);
1371
1372         if (do_create)
1373                 arg->set = ptlrpc_prep_set();
1374
1375         EXIT;
1376 }
1377
1378 static int
1379 ldlm_work_bl_ast_lock(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg)
1380 {
1381         struct ldlm_lock_desc d;
1382         struct ldlm_lock *lock = cfs_list_entry(tmp, struct ldlm_lock,
1383                                                 l_bl_ast);
1384         ENTRY;
1385
1386         /* nobody should touch l_bl_ast */
1387         lock_res_and_lock(lock);
1388         cfs_list_del_init(&lock->l_bl_ast);
1389
1390         LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1391         LASSERT(lock->l_bl_ast_run == 0);
1392         LASSERT(lock->l_blocking_lock);
1393         lock->l_bl_ast_run++;
1394         unlock_res_and_lock(lock);
1395
1396         ldlm_lock2desc(lock->l_blocking_lock, &d);
1397
1398         lock->l_blocking_ast(lock, &d, (void *)arg,
1399                              LDLM_CB_BLOCKING);
1400         LDLM_LOCK_RELEASE(lock->l_blocking_lock);
1401         lock->l_blocking_lock = NULL;
1402         LDLM_LOCK_RELEASE(lock);
1403
1404         RETURN(1);
1405 }
1406
1407 static int
1408 ldlm_work_cp_ast_lock(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg)
1409 {
1410         struct ldlm_lock *lock = cfs_list_entry(tmp, struct ldlm_lock, l_cp_ast);
1411         ldlm_completion_callback completion_callback;
1412         int rc = 0;
1413         ENTRY;
1414
1415         /* It's possible to receive a completion AST before we've set
1416          * the l_completion_ast pointer: either because the AST arrived
1417          * before the reply, or simply because there's a small race
1418          * window between receiving the reply and finishing the local
1419          * enqueue. (bug 842)
1420          *
1421          * This can't happen with the blocking_ast, however, because we
1422          * will never call the local blocking_ast until we drop our
1423          * reader/writer reference, which we won't do until we get the
1424          * reply and finish enqueueing. */
1425
1426         /* nobody should touch l_cp_ast */
1427         lock_res_and_lock(lock);
1428         cfs_list_del_init(&lock->l_cp_ast);
1429         LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1430         /* save l_completion_ast since it can be changed by
1431          * mds_intent_policy(), see bug 14225 */
1432         completion_callback = lock->l_completion_ast;
1433         lock->l_flags &= ~LDLM_FL_CP_REQD;
1434         unlock_res_and_lock(lock);
1435
1436         if (completion_callback != NULL) {
1437                 completion_callback(lock, 0, (void *)arg);
1438                 rc = 1;
1439         }
1440         LDLM_LOCK_RELEASE(lock);
1441
1442         RETURN(rc);
1443 }
1444
1445 static int
1446 ldlm_work_revoke_ast_lock(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg)
1447 {
1448         struct ldlm_lock_desc desc;
1449         struct ldlm_lock *lock = cfs_list_entry(tmp, struct ldlm_lock,
1450                                                 l_rk_ast);
1451         ENTRY;
1452
1453         cfs_list_del_init(&lock->l_rk_ast);
1454
1455         /* the desc just pretend to exclusive */
1456         ldlm_lock2desc(lock, &desc);
1457         desc.l_req_mode = LCK_EX;
1458         desc.l_granted_mode = 0;
1459
1460         lock->l_blocking_ast(lock, &desc, (void*)arg, LDLM_CB_BLOCKING);
1461         LDLM_LOCK_RELEASE(lock);
1462
1463         RETURN(1);
1464 }
1465
1466 int ldlm_run_ast_work(cfs_list_t *rpc_list, ldlm_desc_ast_t ast_type)
1467 {
1468         struct ldlm_cb_set_arg arg;
1469         cfs_list_t *tmp, *pos;
1470         int (*work_ast_lock)(cfs_list_t *tmp, struct ldlm_cb_set_arg *arg);
1471         int ast_count;
1472         ENTRY;
1473
1474         if (cfs_list_empty(rpc_list))
1475                 RETURN(0);
1476
1477         arg.set = ptlrpc_prep_set();
1478         if (NULL == arg.set)
1479                 RETURN(-ERESTART);
1480         cfs_atomic_set(&arg.restart, 0);
1481         switch (ast_type) {
1482         case LDLM_WORK_BL_AST:
1483                 arg.type = LDLM_BL_CALLBACK;
1484                 work_ast_lock = ldlm_work_bl_ast_lock;
1485                 break;
1486         case LDLM_WORK_CP_AST:
1487                 arg.type = LDLM_CP_CALLBACK;
1488                 work_ast_lock = ldlm_work_cp_ast_lock;
1489                 break;
1490         case LDLM_WORK_REVOKE_AST:
1491                 arg.type = LDLM_BL_CALLBACK;
1492                 work_ast_lock = ldlm_work_revoke_ast_lock;
1493                 break;
1494         default:
1495                 LBUG();
1496         }
1497
1498         ast_count = 0;
1499         cfs_list_for_each_safe(tmp, pos, rpc_list) {
1500                 ast_count += work_ast_lock(tmp, &arg);
1501
1502                 /* Send the request set if it exceeds the PARALLEL_AST_LIMIT,
1503                  * and create a new set for requests that remained in
1504                  * @rpc_list */
1505                 if (unlikely(ast_count == PARALLEL_AST_LIMIT)) {
1506                         ldlm_send_and_maybe_create_set(&arg, 1);
1507                         ast_count = 0;
1508                 }
1509         }
1510
1511         if (ast_count > 0)
1512                 ldlm_send_and_maybe_create_set(&arg, 0);
1513         else
1514                 /* In case when number of ASTs is multiply of
1515                  * PARALLEL_AST_LIMIT or @rpc_list was initially empty,
1516                  * @arg.set must be destroyed here, otherwise we get
1517                  * write memory leaking. */
1518                 ptlrpc_set_destroy(arg.set);
1519
1520         RETURN(cfs_atomic_read(&arg.restart) ? -ERESTART : 0);
1521 }
1522
1523 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1524 {
1525         ldlm_reprocess_all(res);
1526         return LDLM_ITER_CONTINUE;
1527 }
1528
1529 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1530 {
1531         cfs_list_t *tmp;
1532         int i, rc;
1533
1534         if (ns == NULL)
1535                 return;
1536
1537         ENTRY;
1538         cfs_spin_lock(&ns->ns_hash_lock);
1539         for (i = 0; i < RES_HASH_SIZE; i++) {
1540                 tmp = ns->ns_hash[i].next;
1541                 while (tmp != &(ns->ns_hash[i])) {
1542                         struct ldlm_resource *res =
1543                                 cfs_list_entry(tmp, struct ldlm_resource,
1544                                                lr_hash);
1545
1546                         ldlm_resource_getref(res);
1547                         cfs_spin_unlock(&ns->ns_hash_lock);
1548                         LDLM_RESOURCE_ADDREF(res);
1549
1550                         rc = reprocess_one_queue(res, NULL);
1551
1552                         LDLM_RESOURCE_DELREF(res);
1553                         cfs_spin_lock(&ns->ns_hash_lock);
1554                         tmp = tmp->next;
1555                         ldlm_resource_putref_locked(res);
1556
1557                         if (rc == LDLM_ITER_STOP)
1558                                 GOTO(out, rc);
1559                 }
1560         }
1561  out:
1562         cfs_spin_unlock(&ns->ns_hash_lock);
1563         EXIT;
1564 }
1565
1566 void ldlm_reprocess_all(struct ldlm_resource *res)
1567 {
1568         CFS_LIST_HEAD(rpc_list);
1569         int rc;
1570         ENTRY;
1571
1572         /* Local lock trees don't get reprocessed. */
1573         if (ns_is_client(res->lr_namespace)) {
1574                 EXIT;
1575                 return;
1576         }
1577
1578  restart:
1579         lock_res(res);
1580         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1581         if (rc == LDLM_ITER_CONTINUE)
1582                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1583         unlock_res(res);
1584
1585         rc = ldlm_run_ast_work(&rpc_list, LDLM_WORK_CP_AST);
1586         if (rc == -ERESTART) {
1587                 LASSERT(cfs_list_empty(&rpc_list));
1588                 goto restart;
1589         }
1590         EXIT;
1591 }
1592
1593 void ldlm_cancel_callback(struct ldlm_lock *lock)
1594 {
1595         check_res_locked(lock->l_resource);
1596         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1597                 lock->l_flags |= LDLM_FL_CANCEL;
1598                 if (lock->l_blocking_ast) {
1599                         // l_check_no_ns_lock(ns);
1600                         unlock_res_and_lock(lock);
1601                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1602                                              LDLM_CB_CANCELING);
1603                         lock_res_and_lock(lock);
1604                 } else {
1605                         LDLM_DEBUG(lock, "no blocking ast");
1606                 }
1607         }
1608         lock->l_flags |= LDLM_FL_BL_DONE;
1609 }
1610
1611 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1612 {
1613         if (req->l_resource->lr_type != LDLM_PLAIN &&
1614             req->l_resource->lr_type != LDLM_IBITS)
1615                 return;
1616
1617         cfs_list_del_init(&req->l_sl_policy);
1618         cfs_list_del_init(&req->l_sl_mode);
1619 }
1620
1621 void ldlm_lock_cancel(struct ldlm_lock *lock)
1622 {
1623         struct ldlm_resource *res;
1624         struct ldlm_namespace *ns;
1625         ENTRY;
1626
1627         lock_res_and_lock(lock);
1628
1629         res = lock->l_resource;
1630         ns = res->lr_namespace;
1631
1632         /* Please do not, no matter how tempting, remove this LBUG without
1633          * talking to me first. -phik */
1634         if (lock->l_readers || lock->l_writers) {
1635                 LDLM_ERROR(lock, "lock still has references");
1636                 LBUG();
1637         }
1638
1639         ldlm_del_waiting_lock(lock);
1640
1641         /* Releases cancel callback. */
1642         ldlm_cancel_callback(lock);
1643
1644         /* Yes, second time, just in case it was added again while we were
1645            running with no res lock in ldlm_cancel_callback */
1646         ldlm_del_waiting_lock(lock);
1647         ldlm_resource_unlink_lock(lock);
1648         ldlm_lock_destroy_nolock(lock);
1649
1650         if (lock->l_granted_mode == lock->l_req_mode)
1651                 ldlm_pool_del(&ns->ns_pool, lock);
1652
1653         /* Make sure we will not be called again for same lock what is possible
1654          * if not to zero out lock->l_granted_mode */
1655         lock->l_granted_mode = LCK_MINMODE;
1656         unlock_res_and_lock(lock);
1657
1658         EXIT;
1659 }
1660
1661 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1662 {
1663         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1664         ENTRY;
1665
1666         if (lock == NULL)
1667                 RETURN(-EINVAL);
1668
1669         lock->l_ast_data = data;
1670         LDLM_LOCK_PUT(lock);
1671         RETURN(0);
1672 }
1673
1674 void ldlm_cancel_locks_for_export_cb(void *obj, void *data)
1675 {
1676         struct obd_export    *exp = data;
1677         struct ldlm_lock     *lock = obj;
1678         struct ldlm_resource *res;
1679
1680         res = ldlm_resource_getref(lock->l_resource);
1681         LDLM_LOCK_GET(lock);
1682
1683         LDLM_DEBUG(lock, "export %p", exp);
1684         ldlm_res_lvbo_update(res, NULL, 1);
1685         ldlm_lock_cancel(lock);
1686         ldlm_reprocess_all(res);
1687         ldlm_resource_putref(res);
1688         LDLM_LOCK_RELEASE(lock);
1689 }
1690
1691 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1692 {
1693         cfs_hash_for_each_empty(exp->exp_lock_hash,
1694                                 ldlm_cancel_locks_for_export_cb, exp);
1695 }
1696
1697 /**
1698  * Downgrade an exclusive lock.
1699  *
1700  * A fast variant of ldlm_lock_convert for convertion of exclusive
1701  * locks. The convertion is always successful.
1702  *
1703  * \param lock A lock to convert
1704  * \param new_mode new lock mode
1705  */
1706 void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode)
1707 {
1708         struct ldlm_namespace *ns;
1709         ENTRY;
1710
1711         LASSERT(lock->l_granted_mode & (LCK_PW | LCK_EX));
1712         LASSERT(new_mode == LCK_COS);
1713
1714         lock_res_and_lock(lock);
1715         ldlm_resource_unlink_lock(lock);
1716         /*
1717          * Remove the lock from pool as it will be added again in
1718          * ldlm_grant_lock() called below.
1719          */
1720         ns = lock->l_resource->lr_namespace;
1721         ldlm_pool_del(&ns->ns_pool, lock);
1722
1723         lock->l_req_mode = new_mode;
1724         ldlm_grant_lock(lock, NULL);
1725         unlock_res_and_lock(lock);
1726         ldlm_reprocess_all(lock->l_resource);
1727
1728         EXIT;
1729 }
1730
1731 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1732                                         __u32 *flags)
1733 {
1734         CFS_LIST_HEAD(rpc_list);
1735         struct ldlm_resource *res;
1736         struct ldlm_namespace *ns;
1737         int granted = 0;
1738         int old_mode, rc;
1739         struct sl_insert_point prev;
1740         ldlm_error_t err;
1741         struct ldlm_interval *node;
1742         ENTRY;
1743
1744         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1745                 *flags |= LDLM_FL_BLOCK_GRANTED;
1746                 RETURN(lock->l_resource);
1747         }
1748
1749         /* I can't check the type of lock here because the bitlock of lock
1750          * is not held here, so do the allocation blindly. -jay */
1751         OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, CFS_ALLOC_IO);
1752         if (node == NULL)  /* Actually, this causes EDEADLOCK to be returned */
1753                 RETURN(NULL);
1754
1755         LASSERTF((new_mode == LCK_PW && lock->l_granted_mode == LCK_PR),
1756                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1757
1758         lock_res_and_lock(lock);
1759
1760         res = lock->l_resource;
1761         ns = res->lr_namespace;
1762
1763         old_mode = lock->l_req_mode;
1764         lock->l_req_mode = new_mode;
1765         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1766                 /* remember the lock position where the lock might be
1767                  * added back to the granted list later and also
1768                  * remember the join mode for skiplist fixing. */
1769                 prev.res_link = lock->l_res_link.prev;
1770                 prev.mode_link = lock->l_sl_mode.prev;
1771                 prev.policy_link = lock->l_sl_policy.prev;
1772                 ldlm_resource_unlink_lock(lock);
1773         } else {
1774                 ldlm_resource_unlink_lock(lock);
1775                 if (res->lr_type == LDLM_EXTENT) {
1776                         /* FIXME: ugly code, I have to attach the lock to a
1777                          * interval node again since perhaps it will be granted
1778                          * soon */
1779                         CFS_INIT_LIST_HEAD(&node->li_group);
1780                         ldlm_interval_attach(node, lock);
1781                         node = NULL;
1782                 }
1783         }
1784
1785         /*
1786          * Remove old lock from the pool before adding the lock with new
1787          * mode below in ->policy()
1788          */
1789         ldlm_pool_del(&ns->ns_pool, lock);
1790
1791         /* If this is a local resource, put it on the appropriate list. */
1792         if (ns_is_client(res->lr_namespace)) {
1793                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1794                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1795                 } else {
1796                         /* This should never happen, because of the way the
1797                          * server handles conversions. */
1798                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1799                                    *flags);
1800                         LBUG();
1801
1802                         ldlm_grant_lock(lock, &rpc_list);
1803                         granted = 1;
1804                         /* FIXME: completion handling not with ns_lock held ! */
1805                         if (lock->l_completion_ast)
1806                                 lock->l_completion_ast(lock, 0, NULL);
1807                 }
1808         } else {
1809                 int pflags = 0;
1810                 ldlm_processing_policy policy;
1811                 policy = ldlm_processing_policy_table[res->lr_type];
1812                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1813                 if (rc == LDLM_ITER_STOP) {
1814                         lock->l_req_mode = old_mode;
1815                         if (res->lr_type == LDLM_EXTENT)
1816                                 ldlm_extent_add_lock(res, lock);
1817                         else
1818                                 ldlm_granted_list_add_lock(lock, &prev);
1819
1820                         res = NULL;
1821                 } else {
1822                         *flags |= LDLM_FL_BLOCK_GRANTED;
1823                         granted = 1;
1824                 }
1825         }
1826         unlock_res_and_lock(lock);
1827
1828         if (granted)
1829                 ldlm_run_ast_work(&rpc_list, LDLM_WORK_CP_AST);
1830         if (node)
1831                 OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
1832         RETURN(res);
1833 }
1834
1835 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1836 {
1837         struct obd_device *obd = NULL;
1838
1839         if (!((libcfs_debug | D_ERROR) & level))
1840                 return;
1841
1842         if (!lock) {
1843                 CDEBUG(level, "  NULL LDLM lock\n");
1844                 return;
1845         }
1846
1847         CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1848                lock, lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
1849                pos, lock->l_pid);
1850         if (lock->l_conn_export != NULL)
1851                 obd = lock->l_conn_export->exp_obd;
1852         if (lock->l_export && lock->l_export->exp_connection) {
1853                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1854                      libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1855                      lock->l_remote_handle.cookie);
1856         } else if (obd == NULL) {
1857                 CDEBUG(level, "  Node: local\n");
1858         } else {
1859                 struct obd_import *imp = obd->u.cli.cl_import;
1860                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1861                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1862                        lock->l_remote_handle.cookie);
1863         }
1864         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64"/"LPU64")\n",
1865                   lock->l_resource,
1866                   lock->l_resource->lr_name.name[0],
1867                   lock->l_resource->lr_name.name[1],
1868                   lock->l_resource->lr_name.name[2]);
1869         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1870                "write: %d flags: "LPX64"\n", ldlm_lockname[lock->l_req_mode],
1871                ldlm_lockname[lock->l_granted_mode],
1872                cfs_atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1873                lock->l_flags);
1874         if (lock->l_resource->lr_type == LDLM_EXTENT)
1875                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1876                        " (req "LPU64"-"LPU64")\n",
1877                        lock->l_policy_data.l_extent.start,
1878                        lock->l_policy_data.l_extent.end,
1879                        lock->l_req_extent.start, lock->l_req_extent.end);
1880         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1881                 CDEBUG(level, "  Pid: %d Extent: "LPU64" -> "LPU64"\n",
1882                        lock->l_policy_data.l_flock.pid,
1883                        lock->l_policy_data.l_flock.start,
1884                        lock->l_policy_data.l_flock.end);
1885        else if (lock->l_resource->lr_type == LDLM_IBITS)
1886                 CDEBUG(level, "  Bits: "LPX64"\n",
1887                        lock->l_policy_data.l_inodebits.bits);
1888 }
1889
1890 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1891 {
1892         struct ldlm_lock *lock;
1893
1894         if (!((libcfs_debug | D_ERROR) & level))
1895                 return;
1896
1897         lock = ldlm_handle2lock(lockh);
1898         if (lock == NULL)
1899                 return;
1900
1901         ldlm_lock_dump(D_OTHER, lock, 0);
1902
1903         LDLM_LOCK_PUT(lock);
1904 }
1905
1906 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
1907                       struct libcfs_debug_msg_data *data, const char *fmt,
1908                       ...)
1909 {
1910         va_list args;
1911         cfs_debug_limit_state_t *cdls = data->msg_cdls;
1912
1913         va_start(args, fmt);
1914
1915         if (lock->l_resource == NULL) {
1916                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
1917                                    data->msg_fn, data->msg_line, fmt, args,
1918                        " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1919                        "res: \?\? rrc=\?\? type: \?\?\? flags: "LPX64" remote: "
1920                        LPX64" expref: %d pid: %u timeout: %lu\n", lock,
1921                        lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
1922                        lock->l_readers, lock->l_writers,
1923                        ldlm_lockname[lock->l_granted_mode],
1924                        ldlm_lockname[lock->l_req_mode],
1925                        lock->l_flags, lock->l_remote_handle.cookie,
1926                        lock->l_export ?
1927                        cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
1928                        lock->l_pid, lock->l_callback_timeout);
1929                 va_end(args);
1930                 return;
1931         }
1932
1933         switch (lock->l_resource->lr_type) {
1934         case LDLM_EXTENT:
1935                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
1936                                    data->msg_fn, data->msg_line, fmt, args,
1937                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1938                        "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
1939                        "] (req "LPU64"->"LPU64") flags: "LPX64" remote: "LPX64
1940                        " expref: %d pid: %u timeout %lu\n",
1941                        lock->l_resource->lr_namespace->ns_name, lock,
1942                        lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
1943                        lock->l_readers, lock->l_writers,
1944                        ldlm_lockname[lock->l_granted_mode],
1945                        ldlm_lockname[lock->l_req_mode],
1946                        lock->l_resource->lr_name.name[0],
1947                        lock->l_resource->lr_name.name[1],
1948                        cfs_atomic_read(&lock->l_resource->lr_refcount),
1949                        ldlm_typename[lock->l_resource->lr_type],
1950                        lock->l_policy_data.l_extent.start,
1951                        lock->l_policy_data.l_extent.end,
1952                        lock->l_req_extent.start, lock->l_req_extent.end,
1953                        lock->l_flags, lock->l_remote_handle.cookie,
1954                        lock->l_export ?
1955                        cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
1956                        lock->l_pid, lock->l_callback_timeout);
1957                 break;
1958
1959         case LDLM_FLOCK:
1960                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
1961                                    data->msg_fn, data->msg_line, fmt, args,
1962                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1963                        "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "
1964                        "["LPU64"->"LPU64"] flags: "LPX64" remote: "LPX64
1965                        " expref: %d pid: %u timeout: %lu\n",
1966                        lock->l_resource->lr_namespace->ns_name, lock,
1967                        lock->l_handle.h_cookie, cfs_atomic_read(&lock->l_refc),
1968                        lock->l_readers, lock->l_writers,
1969                        ldlm_lockname[lock->l_granted_mode],
1970                        ldlm_lockname[lock->l_req_mode],
1971                        lock->l_resource->lr_name.name[0],
1972                        lock->l_resource->lr_name.name[1],
1973                        cfs_atomic_read(&lock->l_resource->lr_refcount),
1974                        ldlm_typename[lock->l_resource->lr_type],
1975                        lock->l_policy_data.l_flock.pid,
1976                        lock->l_policy_data.l_flock.start,
1977                        lock->l_policy_data.l_flock.end,
1978                        lock->l_flags, lock->l_remote_handle.cookie,
1979                        lock->l_export ?
1980                        cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
1981                        lock->l_pid, lock->l_callback_timeout);
1982                 break;
1983
1984         case LDLM_IBITS:
1985                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
1986                                    data->msg_fn, data->msg_line, fmt, args,
1987                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1988                        "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
1989                        "flags: "LPX64" remote: "LPX64" expref: %d "
1990                        "pid: %u timeout: %lu\n",
1991                        lock->l_resource->lr_namespace->ns_name,
1992                        lock, lock->l_handle.h_cookie,
1993                        cfs_atomic_read (&lock->l_refc),
1994                        lock->l_readers, lock->l_writers,
1995                        ldlm_lockname[lock->l_granted_mode],
1996                        ldlm_lockname[lock->l_req_mode],
1997                        lock->l_resource->lr_name.name[0],
1998                        lock->l_resource->lr_name.name[1],
1999                        lock->l_policy_data.l_inodebits.bits,
2000                        cfs_atomic_read(&lock->l_resource->lr_refcount),
2001                        ldlm_typename[lock->l_resource->lr_type],
2002                        lock->l_flags, lock->l_remote_handle.cookie,
2003                        lock->l_export ?
2004                        cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2005                        lock->l_pid, lock->l_callback_timeout);
2006                 break;
2007
2008         default:
2009                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level,data->msg_file,
2010                                    data->msg_fn, data->msg_line, fmt, args,
2011                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
2012                        "res: "LPU64"/"LPU64" rrc: %d type: %s flags: "LPX64" "
2013                        "remote: "LPX64" expref: %d pid: %u timeout %lu\n",
2014                        lock->l_resource->lr_namespace->ns_name,
2015                        lock, lock->l_handle.h_cookie,
2016                        cfs_atomic_read (&lock->l_refc),
2017                        lock->l_readers, lock->l_writers,
2018                        ldlm_lockname[lock->l_granted_mode],
2019                        ldlm_lockname[lock->l_req_mode],
2020                        lock->l_resource->lr_name.name[0],
2021                        lock->l_resource->lr_name.name[1],
2022                        cfs_atomic_read(&lock->l_resource->lr_refcount),
2023                        ldlm_typename[lock->l_resource->lr_type],
2024                        lock->l_flags, lock->l_remote_handle.cookie,
2025                        lock->l_export ?
2026                        cfs_atomic_read(&lock->l_export->exp_refcount) : -99,
2027                        lock->l_pid, lock->l_callback_timeout);
2028                 break;
2029         }
2030         va_end(args);
2031 }
2032 EXPORT_SYMBOL(_ldlm_lock_debug);