lustre/ldlm/ldlm_lock.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of the Lustre file system, http://www.lustre.org
   9  *   Lustre is a trademark of Cluster File Systems, Inc.
  10  *
  11  *   You may have signed or agreed to another license before downloading
  12  *   this software.  If so, you are bound by the terms and conditions
  13  *   of that agreement, and the following does not apply to you.  See the
  14  *   LICENSE file included with this distribution for more information.
  15  *
  16  *   If you did not agree to a different license, then this copy of Lustre
  17  *   is open source software; you can redistribute it and/or modify it
  18  *   under the terms of version 2 of the GNU General Public License as
  19  *   published by the Free Software Foundation.
  20  *
  21  *   In either case, Lustre is distributed in the hope that it will be
  22  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  23  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *   license text for more details.
  25  */
  26
  27 #define DEBUG_SUBSYSTEM S_LDLM
  28
  29 #ifdef __KERNEL__
  30 # include <libcfs/libcfs.h>
  31 # ifndef HAVE_VFS_INTENT_PATCHES
  32 # include <linux/lustre_intent.h>
  33 # endif
  34 #else
  35 # include <liblustre.h>
  36 # include <libcfs/kp30.h>
  37 #endif
  38
  39 #include <obd_class.h>
  40 #include "ldlm_internal.h"
  41
  42 /* lock's skip list pointers fix mode */
  43 #define LDLM_JOIN_NONE          0
  44 #define LDLM_MODE_JOIN_RIGHT    1
  45 #define LDLM_MODE_JOIN_LEFT     (1 << 1)
  46 #define LDLM_POLICY_JOIN_RIGHT  (1 << 2)
  47 #define LDLM_POLICY_JOIN_LEFT   (1 << 3)
  48
  49 /* lock types */
  50 char *ldlm_lockname[] = {
  51         [0] "--",
  52         [LCK_EX] "EX",
  53         [LCK_PW] "PW",
  54         [LCK_PR] "PR",
  55         [LCK_CW] "CW",
  56         [LCK_CR] "CR",
  57         [LCK_NL] "NL",
  58         [LCK_GROUP] "GROUP"
  59 };
  60
  61 char *ldlm_typename[] = {
  62         [LDLM_PLAIN] "PLN",
  63         [LDLM_EXTENT] "EXT",
  64         [LDLM_FLOCK] "FLK",
  65         [LDLM_IBITS] "IBT",
  66 };
  67
  68 char *ldlm_it2str(int it)
  69 {
  70         switch (it) {
  71         case IT_OPEN:
  72                 return "open";
  73         case IT_CREAT:
  74                 return "creat";
  75         case (IT_OPEN | IT_CREAT):
  76                 return "open|creat";
  77         case IT_READDIR:
  78                 return "readdir";
  79         case IT_GETATTR:
  80                 return "getattr";
  81         case IT_LOOKUP:
  82                 return "lookup";
  83         case IT_UNLINK:
  84                 return "unlink";
  85         case IT_GETXATTR:
  86                 return "getxattr";
  87         default:
  88                 CERROR("Unknown intent %d\n", it);
  89                 return "UNKNOWN";
  90         }
  91 }
  92
  93 extern cfs_mem_cache_t *ldlm_lock_slab;
  94
  95 static ldlm_processing_policy ldlm_processing_policy_table[] = {
  96         [LDLM_PLAIN] ldlm_process_plain_lock,
  97         [LDLM_EXTENT] ldlm_process_extent_lock,
  98 #ifdef __KERNEL__
  99         [LDLM_FLOCK] ldlm_process_flock_lock,
 100 #endif
 101         [LDLM_IBITS] ldlm_process_inodebits_lock,
 102 };
 103
 104 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
 105 {
 106         return ldlm_processing_policy_table[res->lr_type];
 107 }
 108
 109 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
 110 {
 111         ns->ns_policy = arg;
 112 }
 113
 114 /*
 115  * REFCOUNTED LOCK OBJECTS
 116  */
 117
 118
 119 /*
 120  * Lock refcounts, during creation:
 121  *   - one special one for allocation, dec'd only once in destroy
 122  *   - one for being a lock that's in-use
 123  *   - one for the addref associated with a new lock
 124  */
 125 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
 126 {
 127         atomic_inc(&lock->l_refc);
 128         return lock;
 129 }
 130
 131 static void ldlm_lock_free(struct ldlm_lock *lock, size_t size)
 132 {
 133         LASSERT(size == sizeof(*lock));
 134         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
 135 }
 136
 137 void ldlm_lock_put(struct ldlm_lock *lock)
 138 {
 139         ENTRY;
 140
 141         LASSERT(lock->l_resource != LP_POISON);
 142         LASSERT(atomic_read(&lock->l_refc) > 0);
 143         if (atomic_dec_and_test(&lock->l_refc)) {
 144                 struct ldlm_resource *res;
 145
 146                 LDLM_DEBUG(lock,
 147                            "final lock_put on destroyed lock, freeing it.");
 148
 149                 res = lock->l_resource;
 150                 LASSERT(lock->l_destroyed);
 151                 LASSERT(list_empty(&lock->l_res_link));
 152                 LASSERT(list_empty(&lock->l_pending_chain));
 153
 154                 atomic_dec(&res->lr_namespace->ns_locks);
 155                 ldlm_resource_putref(res);
 156                 lock->l_resource = NULL;
 157                 if (lock->l_export) {
 158                         class_export_put(lock->l_export);
 159                         lock->l_export = NULL;
 160                 }
 161
 162                 if (lock->l_lvb_data != NULL)
 163                         OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
 164
 165                 OBD_FREE_RCU_CB(lock, sizeof(*lock), &lock->l_handle,
 166                                 ldlm_lock_free);
 167         }
 168
 169         EXIT;
 170 }
 171
 172 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
 173 {
 174         int rc = 0;
 175         if (!list_empty(&lock->l_lru)) {
 176                 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 177                 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 178                 list_del_init(&lock->l_lru);
 179                 ns->ns_nr_unused--;
 180                 LASSERT(ns->ns_nr_unused >= 0);
 181                 rc = 1;
 182         }
 183         return rc;
 184 }
 185
 186 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
 187 {
 188         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 189         int rc;
 190         ENTRY;
 191         spin_lock(&ns->ns_unused_lock);
 192         rc = ldlm_lock_remove_from_lru_nolock(lock);
 193         spin_unlock(&ns->ns_unused_lock);
 194         EXIT;
 195         return rc;
 196 }
 197
 198 void ldlm_lock_add_to_lru_nolock(struct ldlm_lock *lock)
 199 {
 200         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 201         lock->l_last_used = cfs_time_current();
 202         LASSERT(list_empty(&lock->l_lru));
 203         list_add_tail(&lock->l_lru, &ns->ns_unused_list);
 204         LASSERT(ns->ns_nr_unused >= 0);
 205         ns->ns_nr_unused++;
 206 }
 207
 208 void ldlm_lock_add_to_lru(struct ldlm_lock *lock)
 209 {
 210         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 211         ENTRY;
 212         spin_lock(&ns->ns_unused_lock);
 213         ldlm_lock_add_to_lru_nolock(lock);
 214         spin_unlock(&ns->ns_unused_lock);
 215         EXIT;
 216 }
 217
 218 void ldlm_lock_touch_in_lru(struct ldlm_lock *lock)
 219 {
 220         struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
 221         ENTRY;
 222         spin_lock(&ns->ns_unused_lock);
 223         if (!list_empty(&lock->l_lru)) {
 224                 ldlm_lock_remove_from_lru_nolock(lock);
 225                 ldlm_lock_add_to_lru_nolock(lock);
 226         }
 227         spin_unlock(&ns->ns_unused_lock);
 228         EXIT;
 229 }
 230
 231 /* This used to have a 'strict' flag, which recovery would use to mark an
 232  * in-use lock as needing-to-die.  Lest I am ever tempted to put it back, I
 233  * shall explain why it's gone: with the new hash table scheme, once you call
 234  * ldlm_lock_destroy, you can never drop your final references on this lock.
 235  * Because it's not in the hash table anymore.  -phil */
 236 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
 237 {
 238         ENTRY;
 239
 240         if (lock->l_readers || lock->l_writers) {
 241                 LDLM_ERROR(lock, "lock still has references");
 242                 ldlm_lock_dump(D_ERROR, lock, 0);
 243                 LBUG();
 244         }
 245
 246         if (!list_empty(&lock->l_res_link)) {
 247                 LDLM_ERROR(lock, "lock still on resource");
 248                 ldlm_lock_dump(D_ERROR, lock, 0);
 249                 LBUG();
 250         }
 251
 252         if (lock->l_destroyed) {
 253                 LASSERT(list_empty(&lock->l_lru));
 254                 EXIT;
 255                 return 0;
 256         }
 257         lock->l_destroyed = 1;
 258
 259         if (lock->l_export)
 260                 spin_lock(&lock->l_export->exp_ldlm_data.led_lock);
 261         list_del_init(&lock->l_export_chain);
 262         if (lock->l_export)
 263                 spin_unlock(&lock->l_export->exp_ldlm_data.led_lock);
 264
 265         ldlm_lock_remove_from_lru(lock);
 266         class_handle_unhash(&lock->l_handle);
 267
 268 #if 0
 269         /* Wake anyone waiting for this lock */
 270         /* FIXME: I should probably add yet another flag, instead of using
 271          * l_export to only call this on clients */
 272         if (lock->l_export)
 273                 class_export_put(lock->l_export);
 274         lock->l_export = NULL;
 275         if (lock->l_export && lock->l_completion_ast)
 276                 lock->l_completion_ast(lock, 0);
 277 #endif
 278         EXIT;
 279         return 1;
 280 }
 281
 282 void ldlm_lock_destroy(struct ldlm_lock *lock)
 283 {
 284         int first;
 285         ENTRY;
 286         lock_res_and_lock(lock);
 287         first = ldlm_lock_destroy_internal(lock);
 288         unlock_res_and_lock(lock);
 289
 290         /* drop reference from hashtable only for first destroy */
 291         if (first)
 292                 LDLM_LOCK_PUT(lock);
 293         EXIT;
 294 }
 295
 296 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
 297 {
 298         int first;
 299         ENTRY;
 300         first = ldlm_lock_destroy_internal(lock);
 301         /* drop reference from hashtable only for first destroy */
 302         if (first)
 303                 LDLM_LOCK_PUT(lock);
 304         EXIT;
 305 }
 306
 307 /* this is called by portals_handle2object with the handle lock taken */
 308 static void lock_handle_addref(void *lock)
 309 {
 310         LDLM_LOCK_GET((struct ldlm_lock *)lock);
 311 }
 312
 313 /*
 314  * usage: pass in a resource on which you have done ldlm_resource_get
 315  *        pass in a parent lock on which you have done a ldlm_lock_get
 316  *        after return, ldlm_*_put the resource and parent
 317  * returns: lock with refcount 2 - one for current caller and one for remote
 318  */
 319 static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource)
 320 {
 321         struct ldlm_lock *lock;
 322         ENTRY;
 323
 324         if (resource == NULL)
 325                 LBUG();
 326
 327         OBD_SLAB_ALLOC(lock, ldlm_lock_slab, CFS_ALLOC_IO, sizeof(*lock));
 328         if (lock == NULL)
 329                 RETURN(NULL);
 330
 331         spin_lock_init(&lock->l_lock);
 332         lock->l_resource = ldlm_resource_getref(resource);
 333
 334         atomic_set(&lock->l_refc, 2);
 335         CFS_INIT_LIST_HEAD(&lock->l_res_link);
 336         CFS_INIT_LIST_HEAD(&lock->l_lru);
 337         CFS_INIT_LIST_HEAD(&lock->l_export_chain);
 338         CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
 339         CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
 340         CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
 341         cfs_waitq_init(&lock->l_waitq);
 342         lock->l_blocking_lock = NULL;
 343         lock->l_sl_mode.prev = NULL;
 344         lock->l_sl_mode.next = NULL;
 345         lock->l_sl_policy.prev = NULL;
 346         lock->l_sl_policy.next = NULL;
 347
 348         atomic_inc(&resource->lr_namespace->ns_locks);
 349         CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
 350         class_handle_hash(&lock->l_handle, lock_handle_addref);
 351
 352         RETURN(lock);
 353 }
 354
 355 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
 356                               const struct ldlm_res_id *new_resid)
 357 {
 358         struct ldlm_resource *oldres = lock->l_resource;
 359         struct ldlm_resource *newres;
 360         int type;
 361         ENTRY;
 362
 363         LASSERT(ns_is_client(ns));
 364
 365         lock_res_and_lock(lock);
 366         if (memcmp(new_resid, &lock->l_resource->lr_name,
 367                    sizeof(lock->l_resource->lr_name)) == 0) {
 368                 /* Nothing to do */
 369                 unlock_res_and_lock(lock);
 370                 RETURN(0);
 371         }
 372
 373         LASSERT(new_resid->name[0] != 0);
 374
 375         /* This function assumes that the lock isn't on any lists */
 376         LASSERT(list_empty(&lock->l_res_link));
 377
 378         type = oldres->lr_type;
 379         unlock_res_and_lock(lock);
 380
 381         newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
 382         if (newres == NULL) {
 383                 LBUG();
 384                 RETURN(-ENOMEM);
 385         }
 386
 387         lock_res_and_lock(lock);
 388         LASSERT(memcmp(new_resid, &lock->l_resource->lr_name,
 389                        sizeof(lock->l_resource->lr_name)) != 0);
 390         lock_res(newres);
 391         lock->l_resource = newres;
 392         unlock_res(oldres);
 393         unlock_res_and_lock(lock);
 394
 395         /* ...and the flowers are still standing! */
 396         ldlm_resource_putref(oldres);
 397
 398         RETURN(0);
 399 }
 400
 401 /*
 402  *  HANDLES
 403  */
 404
 405 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
 406 {
 407         lockh->cookie = lock->l_handle.h_cookie;
 408 }
 409
 410 /* if flags: atomically get the lock and set the flags.
 411  *           Return NULL if flag already set
 412  */
 413
 414 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
 415                                      int flags)
 416 {
 417         struct ldlm_namespace *ns;
 418         struct ldlm_lock *lock, *retval = NULL;
 419         ENTRY;
 420
 421         LASSERT(handle);
 422
 423         lock = class_handle2object(handle->cookie);
 424         if (lock == NULL)
 425                 RETURN(NULL);
 426
 427         LASSERT(lock->l_resource != NULL);
 428         ns = lock->l_resource->lr_namespace;
 429         LASSERT(ns != NULL);
 430
 431         lock_res_and_lock(lock);
 432
 433         /* It's unlikely but possible that someone marked the lock as
 434          * destroyed after we did handle2object on it */
 435         if (lock->l_destroyed) {
 436                 unlock_res_and_lock(lock);
 437                 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
 438                 LDLM_LOCK_PUT(lock);
 439                 GOTO(out, retval);
 440         }
 441
 442         if (flags && (lock->l_flags & flags)) {
 443                 unlock_res_and_lock(lock);
 444                 LDLM_LOCK_PUT(lock);
 445                 GOTO(out, retval);
 446         }
 447
 448         if (flags)
 449                 lock->l_flags |= flags;
 450
 451         unlock_res_and_lock(lock);
 452         retval = lock;
 453         EXIT;
 454  out:
 455         return retval;
 456 }
 457
 458 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *ns,
 459                                       const struct lustre_handle *handle)
 460 {
 461         struct ldlm_lock *retval = NULL;
 462         retval = __ldlm_handle2lock(handle, 0);
 463         return retval;
 464 }
 465
 466 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 467 {
 468         struct obd_export *exp = lock->l_export?:lock->l_conn_export;
 469         /* INODEBITS_INTEROP: If the other side does not support
 470          * inodebits, reply with a plain lock descriptor.
 471          */
 472         if ((lock->l_resource->lr_type == LDLM_IBITS) &&
 473             (exp && !(exp->exp_connect_flags & OBD_CONNECT_IBITS))) {
 474                 struct ldlm_resource res = *lock->l_resource;
 475
 476                 /* Make sure all the right bits are set in this lock we
 477                    are going to pass to client */
 478                 LASSERTF(lock->l_policy_data.l_inodebits.bits ==
 479                          (MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE),
 480                          "Inappropriate inode lock bits during "
 481                          "conversion " LPU64 "\n",
 482                          lock->l_policy_data.l_inodebits.bits);
 483                 res.lr_type = LDLM_PLAIN;
 484                 ldlm_res2desc(&res, &desc->l_resource);
 485                 /* Convert "new" lock mode to something old client can
 486                    understand */
 487                 if ((lock->l_req_mode == LCK_CR) ||
 488                     (lock->l_req_mode == LCK_CW))
 489                         desc->l_req_mode = LCK_PR;
 490                 else
 491                         desc->l_req_mode = lock->l_req_mode;
 492                 if ((lock->l_granted_mode == LCK_CR) ||
 493                     (lock->l_granted_mode == LCK_CW)) {
 494                         desc->l_granted_mode = LCK_PR;
 495                 } else {
 496                         /* We never grant PW/EX locks to clients */
 497                         LASSERT((lock->l_granted_mode != LCK_PW) &&
 498                                 (lock->l_granted_mode != LCK_EX));
 499                         desc->l_granted_mode = lock->l_granted_mode;
 500                 }
 501
 502                 /* We do not copy policy here, because there is no
 503                    policy for plain locks */
 504         } else {
 505                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 506                 desc->l_req_mode = lock->l_req_mode;
 507                 desc->l_granted_mode = lock->l_granted_mode;
 508                 desc->l_policy_data = lock->l_policy_data;
 509         }
 510 }
 511
 512 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 513                            struct list_head *work_list)
 514 {
 515         if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
 516                 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
 517                 lock->l_flags |= LDLM_FL_AST_SENT;
 518                 /* If the enqueuing client said so, tell the AST recipient to
 519                  * discard dirty data, rather than writing back. */
 520                 if (new->l_flags & LDLM_AST_DISCARD_DATA)
 521                         lock->l_flags |= LDLM_FL_DISCARD_DATA;
 522                 LASSERT(list_empty(&lock->l_bl_ast));
 523                 list_add(&lock->l_bl_ast, work_list);
 524                 LDLM_LOCK_GET(lock);
 525                 LASSERT(lock->l_blocking_lock == NULL);
 526                 lock->l_blocking_lock = LDLM_LOCK_GET(new);
 527         }
 528 }
 529
 530 void ldlm_add_cp_work_item(struct ldlm_lock *lock, struct list_head *work_list)
 531 {
 532         if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
 533                 lock->l_flags |= LDLM_FL_CP_REQD;
 534                 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
 535                 LASSERT(list_empty(&lock->l_cp_ast));
 536                 list_add(&lock->l_cp_ast, work_list);
 537                 LDLM_LOCK_GET(lock);
 538         }
 539 }
 540
 541 /* must be called with lr_lock held */
 542 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 543                                 struct list_head *work_list)
 544 {
 545         ENTRY;
 546         check_res_locked(lock->l_resource);
 547         if (new)
 548                 ldlm_add_bl_work_item(lock, new, work_list);
 549         else
 550                 ldlm_add_cp_work_item(lock, work_list);
 551         EXIT;
 552 }
 553
 554 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
 555 {
 556         struct ldlm_lock *lock;
 557
 558         lock = ldlm_handle2lock(lockh);
 559         LASSERT(lock != NULL);
 560         ldlm_lock_addref_internal(lock, mode);
 561         LDLM_LOCK_PUT(lock);
 562 }
 563
 564 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 565 {
 566         ldlm_lock_remove_from_lru(lock);
 567         if (mode & (LCK_NL | LCK_CR | LCK_PR))
 568                 lock->l_readers++;
 569         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP))
 570                 lock->l_writers++;
 571         LDLM_LOCK_GET(lock);
 572         LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
 573 }
 574
 575 /* only called for local locks */
 576 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
 577 {
 578         lock_res_and_lock(lock);
 579         ldlm_lock_addref_internal_nolock(lock, mode);
 580         unlock_res_and_lock(lock);
 581 }
 582
 583 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
 584 {
 585         struct ldlm_namespace *ns;
 586         ENTRY;
 587
 588         lock_res_and_lock(lock);
 589
 590         ns = lock->l_resource->lr_namespace;
 591
 592         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 593         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 594                 LASSERT(lock->l_readers > 0);
 595                 lock->l_readers--;
 596         }
 597         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP)) {
 598                 LASSERT(lock->l_writers > 0);
 599                 lock->l_writers--;
 600         }
 601
 602         if (lock->l_flags & LDLM_FL_LOCAL &&
 603             !lock->l_readers && !lock->l_writers) {
 604                 /* If this is a local lock on a server namespace and this was
 605                  * the last reference, cancel the lock. */
 606                 CDEBUG(D_INFO, "forcing cancel of local lock\n");
 607                 lock->l_flags |= LDLM_FL_CBPENDING;
 608         }
 609
 610         if (!lock->l_readers && !lock->l_writers &&
 611             (lock->l_flags & LDLM_FL_CBPENDING)) {
 612                 /* If we received a blocked AST and this was the last reference,
 613                  * run the callback. */
 614                 if (ns_is_server(ns) && lock->l_export)
 615                         CERROR("FL_CBPENDING set on non-local lock--just a "
 616                                "warning\n");
 617
 618                 LDLM_DEBUG(lock, "final decref done on cbpending lock");
 619
 620                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 621                 ldlm_lock_remove_from_lru(lock);
 622                 unlock_res_and_lock(lock);
 623                 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
 624                     ldlm_bl_to_thread_lock(ns, NULL, lock) != 0)
 625                         ldlm_handle_bl_callback(ns, NULL, lock);
 626         } else if (ns_is_client(ns) &&
 627                    !lock->l_readers && !lock->l_writers &&
 628                    !(lock->l_flags & LDLM_FL_NO_LRU)) {
 629                 /* If this is a client-side namespace and this was the last
 630                  * reference, put it on the LRU. */
 631                 ldlm_lock_add_to_lru(lock);
 632                 unlock_res_and_lock(lock);
 633                 /* Call ldlm_cancel_lru() only if EARLY_CANCEL and LRU RESIZE
 634                  * are not supported by the server, otherwise, it is done on
 635                  * enqueue. */
 636                 if (!exp_connect_cancelset(lock->l_conn_export) &&
 637                     !ns_connect_lru_resize(ns))
 638                         ldlm_cancel_lru(ns, 0, LDLM_ASYNC, 0);
 639         } else {
 640                 unlock_res_and_lock(lock);
 641         }
 642
 643         LDLM_LOCK_PUT(lock);    /* matches the ldlm_lock_get in addref */
 644
 645         EXIT;
 646 }
 647
 648 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
 649 {
 650         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 651         LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
 652         ldlm_lock_decref_internal(lock, mode);
 653         LDLM_LOCK_PUT(lock);
 654 }
 655
 656 /* This will drop a lock reference and mark it for destruction, but will not
 657  * necessarily cancel the lock before returning. */
 658 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
 659 {
 660         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 661         ENTRY;
 662
 663         LASSERT(lock != NULL);
 664
 665         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 666         lock_res_and_lock(lock);
 667         lock->l_flags |= LDLM_FL_CBPENDING;
 668         unlock_res_and_lock(lock);
 669         ldlm_lock_decref_internal(lock, mode);
 670         LDLM_LOCK_PUT(lock);
 671 }
 672
 673 /*
 674  * search_granted_lock
 675  *
 676  * Description:
 677  *      Finds a position to insert the new lock.
 678  * Parameters:
 679  *      queue [input]:  the granted list where search acts on;
 680  *      req [input]:    the lock whose position to be located;
 681  *      lockp [output]: the position where the lock should be inserted before, or
 682  *                      NULL indicating @req should be appended to @queue.
 683  * Return Values:
 684  *      Bit-masks combination of following values indicating in which way the
 685  *      lock need to be inserted.
 686  *      - LDLM_JOIN_NONE:       noting about skip list needs to be fixed;
 687  *      - LDLM_MODE_JOIN_RIGHT: @req needs join right becoming the head of a
 688  *                              mode group;
 689  *      - LDLM_POLICY_JOIN_RIGHT: @req needs join right becoming the head of
 690  *                                a policy group.
 691  * NOTE: called by
 692  *  - ldlm_grant_lock_with_skiplist
 693  */
 694 static int search_granted_lock(struct list_head *queue,
 695                         struct ldlm_lock *req,
 696                         struct ldlm_lock **lockp)
 697 {
 698         struct list_head *tmp, *tmp_tail;
 699         struct ldlm_lock *lock, *mode_head_lock;
 700         int rc = LDLM_JOIN_NONE;
 701         ENTRY;
 702
 703         list_for_each(tmp, queue) {
 704                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 705
 706                 if (lock->l_req_mode != req->l_req_mode) {
 707                         if (LDLM_SL_HEAD(&lock->l_sl_mode))
 708                                 tmp = &list_entry(lock->l_sl_mode.next,
 709                                                   struct ldlm_lock,
 710                                                   l_sl_mode)->l_res_link;
 711                         continue;
 712                 }
 713
 714                 /* found the same mode group */
 715                 if (lock->l_resource->lr_type == LDLM_PLAIN) {
 716                         *lockp = lock;
 717                         rc = LDLM_MODE_JOIN_RIGHT;
 718                         GOTO(out, rc);
 719                 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
 720                         tmp_tail = tmp;
 721                         if (LDLM_SL_HEAD(&lock->l_sl_mode))
 722                                 tmp_tail = &list_entry(lock->l_sl_mode.next,
 723                                                        struct ldlm_lock,
 724                                                        l_sl_mode)->l_res_link;
 725                         mode_head_lock = lock;
 726                         for (;;) {
 727                                 if (lock->l_policy_data.l_inodebits.bits ==
 728                                     req->l_policy_data.l_inodebits.bits) {
 729                                         /* matched policy lock is found */
 730                                         *lockp = lock;
 731                                         rc |= LDLM_POLICY_JOIN_RIGHT;
 732
 733                                         /* if the policy group head is also a
 734                                          * mode group head or a single mode
 735                                          * group lock */
 736                                         if (LDLM_SL_HEAD(&lock->l_sl_mode) ||
 737                                             (tmp == tmp_tail &&
 738                                              LDLM_SL_EMPTY(&lock->l_sl_mode)))
 739                                                 rc |= LDLM_MODE_JOIN_RIGHT;
 740                                         GOTO(out, rc);
 741                                 }
 742
 743                                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
 744                                         tmp = &list_entry(lock->l_sl_policy.next,
 745                                                           struct ldlm_lock,
 746                                                           l_sl_policy)->l_res_link;
 747
 748                                 if (tmp == tmp_tail)
 749                                         break;
 750                                 else
 751                                         tmp = tmp->next;
 752                                 lock = list_entry(tmp, struct ldlm_lock,
 753                                                   l_res_link);
 754                         }  /* for all locks in the matched mode group */
 755
 756                         /* no matched policy group is found, insert before
 757                          * the mode group head lock */
 758                         *lockp = mode_head_lock;
 759                         rc = LDLM_MODE_JOIN_RIGHT;
 760                         GOTO(out, rc);
 761                 } else {
 762                         LDLM_ERROR(lock, "is not LDLM_PLAIN or LDLM_IBITS lock");
 763                         LBUG();
 764                 }
 765         }
 766
 767         /* no matched mode group is found, append to the end */
 768         *lockp = NULL;
 769         rc = LDLM_JOIN_NONE;
 770         EXIT;
 771 out:
 772         return rc;
 773 }
 774
 775 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
 776                                        struct ldlm_lock *lockp,
 777                                        int join)
 778 {
 779         struct ldlm_resource *res = lock->l_resource;
 780         ENTRY;
 781
 782         LASSERT(lockp || join == LDLM_JOIN_NONE);
 783
 784         check_res_locked(res);
 785
 786         ldlm_resource_dump(D_OTHER, res);
 787         CDEBUG(D_OTHER, "About to add this lock:\n");
 788         ldlm_lock_dump(D_OTHER, lock, 0);
 789
 790         if (lock->l_destroyed) {
 791                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
 792                 return;
 793         }
 794
 795         LASSERT(list_empty(&lock->l_res_link));
 796
 797         if (!lockp)
 798                 list_add_tail(&lock->l_res_link, &lock->l_resource->lr_granted);
 799         else if ((join & LDLM_MODE_JOIN_LEFT) || (join & LDLM_POLICY_JOIN_LEFT))
 800                 list_add(&lock->l_res_link, &lockp->l_res_link);
 801         else
 802                 list_add_tail(&lock->l_res_link, &lockp->l_res_link);
 803
 804         /* fix skip lists */
 805         if (join & LDLM_MODE_JOIN_RIGHT) {
 806                 LASSERT(! LDLM_SL_TAIL(&lockp->l_sl_mode));
 807                 if (LDLM_SL_EMPTY(&lockp->l_sl_mode)) {
 808                         lock->l_sl_mode.next = &lockp->l_sl_mode;
 809                         lockp->l_sl_mode.prev = &lock->l_sl_mode;
 810                 } else if (LDLM_SL_HEAD(&lockp->l_sl_mode)) {
 811                         lock->l_sl_mode.next = lockp->l_sl_mode.next;
 812                         lockp->l_sl_mode.next = NULL;
 813                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
 814                 }
 815         } else if (join & LDLM_MODE_JOIN_LEFT) {
 816                 LASSERT(! LDLM_SL_HEAD(&lockp->l_sl_mode));
 817                if (LDLM_SL_EMPTY(&lockp->l_sl_mode)) {
 818                         lock->l_sl_mode.prev = &lockp->l_sl_mode;
 819                         lockp->l_sl_mode.next = &lock->l_sl_mode;
 820                 } else if (LDLM_SL_TAIL(&lockp->l_sl_mode)) {
 821                         lock->l_sl_mode.prev = lockp->l_sl_mode.prev;
 822                         lockp->l_sl_mode.prev = NULL;
 823                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
 824                 }
 825         }
 826
 827         if (join & LDLM_POLICY_JOIN_RIGHT) {
 828                 LASSERT(! LDLM_SL_TAIL(&lockp->l_sl_policy));
 829                 if (LDLM_SL_EMPTY(&lockp->l_sl_policy)) {
 830                         lock->l_sl_policy.next = &lockp->l_sl_policy;
 831                         lockp->l_sl_policy.prev = &lock->l_sl_policy;
 832                 } else if (LDLM_SL_HEAD(&lockp->l_sl_policy)) {
 833                         lock->l_sl_policy.next = lockp->l_sl_policy.next;
 834                         lockp->l_sl_policy.next = NULL;
 835                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
 836                 }
 837         } else if (join & LDLM_POLICY_JOIN_LEFT) {
 838                 LASSERT(! LDLM_SL_HEAD(&lockp->l_sl_policy));
 839                 if (LDLM_SL_EMPTY(&lockp->l_sl_policy)) {
 840                         lock->l_sl_policy.prev = &lockp->l_sl_policy;
 841                         lockp->l_sl_policy.next = &lock->l_sl_policy;
 842                 } else if (LDLM_SL_TAIL(&lockp->l_sl_policy)) {
 843                         lock->l_sl_policy.prev = lockp->l_sl_policy.prev;
 844                         lockp->l_sl_policy.prev = NULL;
 845                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
 846                 }
 847         }
 848
 849         EXIT;
 850 }
 851
 852 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
 853 {
 854         int join = LDLM_JOIN_NONE;
 855         struct ldlm_lock *lockp = NULL;
 856         ENTRY;
 857
 858         LASSERT(lock->l_req_mode == lock->l_granted_mode);
 859
 860         join = search_granted_lock(&lock->l_resource->lr_granted, lock, &lockp);
 861         ldlm_granted_list_add_lock(lock, lockp, join);
 862         EXIT;
 863 }
 864
 865 /* NOTE: called by
 866  *  - ldlm_lock_enqueue
 867  *  - ldlm_reprocess_queue
 868  *  - ldlm_lock_convert
 869  *
 870  * must be called with lr_lock held
 871  */
 872 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
 873 {
 874         struct ldlm_resource *res = lock->l_resource;
 875         ENTRY;
 876
 877         check_res_locked(res);
 878
 879         lock->l_granted_mode = lock->l_req_mode;
 880         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
 881                 ldlm_grant_lock_with_skiplist(lock);
 882         else
 883                 ldlm_resource_add_lock(res, &res->lr_granted, lock);
 884
 885         if (lock->l_granted_mode < res->lr_most_restr)
 886                 res->lr_most_restr = lock->l_granted_mode;
 887
 888         if (work_list && lock->l_completion_ast != NULL)
 889                 ldlm_add_ast_work_item(lock, NULL, work_list);
 890
 891         ldlm_pool_add(&res->lr_namespace->ns_pool, lock);
 892         EXIT;
 893 }
 894
 895 /* returns a referenced lock or NULL.  See the flag descriptions below, in the
 896  * comment above ldlm_lock_match */
 897 static struct ldlm_lock *search_queue(struct list_head *queue,
 898                                       ldlm_mode_t *mode,
 899                                       ldlm_policy_data_t *policy,
 900                                       struct ldlm_lock *old_lock, int flags)
 901 {
 902         struct ldlm_lock *lock;
 903         struct list_head *tmp;
 904
 905         list_for_each(tmp, queue) {
 906                 ldlm_mode_t match;
 907
 908                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 909
 910                 if (lock == old_lock)
 911                         break;
 912
 913                 /* llite sometimes wants to match locks that will be
 914                  * canceled when their users drop, but we allow it to match
 915                  * if it passes in CBPENDING and the lock still has users.
 916                  * this is generally only going to be used by children
 917                  * whose parents already hold a lock so forward progress
 918                  * can still happen. */
 919                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 920                     !(flags & LDLM_FL_CBPENDING))
 921                         continue;
 922                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 923                     lock->l_readers == 0 && lock->l_writers == 0)
 924                         continue;
 925
 926                 if (!(lock->l_req_mode & *mode))
 927                         continue;
 928                 match = lock->l_req_mode;
 929
 930                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 931                     (lock->l_policy_data.l_extent.start >
 932                      policy->l_extent.start ||
 933                      lock->l_policy_data.l_extent.end < policy->l_extent.end))
 934                         continue;
 935
 936                 if (unlikely(match == LCK_GROUP) &&
 937                     lock->l_resource->lr_type == LDLM_EXTENT &&
 938                     lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
 939                         continue;
 940
 941                 /* We match if we have existing lock with same or wider set
 942                    of bits. */
 943                 if (lock->l_resource->lr_type == LDLM_IBITS &&
 944                      ((lock->l_policy_data.l_inodebits.bits &
 945                       policy->l_inodebits.bits) !=
 946                       policy->l_inodebits.bits))
 947                         continue;
 948
 949                 if (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED))
 950                         continue;
 951
 952                 if ((flags & LDLM_FL_LOCAL_ONLY) &&
 953                     !(lock->l_flags & LDLM_FL_LOCAL))
 954                         continue;
 955
 956                 if (flags & LDLM_FL_TEST_LOCK) {
 957                         LDLM_LOCK_GET(lock);
 958                         ldlm_lock_touch_in_lru(lock);
 959                 } else {
 960                         ldlm_lock_addref_internal_nolock(lock, match);
 961                 }
 962                 *mode = match;
 963                 return lock;
 964         }
 965
 966         return NULL;
 967 }
 968
 969 void ldlm_lock_allow_match(struct ldlm_lock *lock)
 970 {
 971         lock_res_and_lock(lock);
 972         lock->l_flags |= LDLM_FL_LVB_READY;
 973         cfs_waitq_signal(&lock->l_waitq);
 974         unlock_res_and_lock(lock);
 975 }
 976
 977 /* Can be called in two ways:
 978  *
 979  * If 'ns' is NULL, then lockh describes an existing lock that we want to look
 980  * for a duplicate of.
 981  *
 982  * Otherwise, all of the fields must be filled in, to match against.
 983  *
 984  * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
 985  *     server (ie, connh is NULL)
 986  * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
 987  *     list will be considered
 988  * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
 989  *     to be canceled can still be matched as long as they still have reader
 990  *     or writer refernces
 991  * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
 992  *     just tell us if we would have matched.
 993  *
 994  * Returns 1 if it finds an already-existing lock that is compatible; in this
 995  * case, lockh is filled in with a addref()ed lock
 996  *
 997  * we also check security context, if that failed we simply return 0 (to keep
 998  * caller code unchanged), the context failure will be discovered by caller
 999  * sometime later.
1000  */
1001 ldlm_mode_t ldlm_lock_match(struct ldlm_namespace *ns, int flags,
1002                             const struct ldlm_res_id *res_id, ldlm_type_t type,
1003                             ldlm_policy_data_t *policy, ldlm_mode_t mode,
1004                             struct lustre_handle *lockh)
1005 {
1006         struct ldlm_resource *res;
1007         struct ldlm_lock *lock, *old_lock = NULL;
1008         int rc = 0;
1009         ENTRY;
1010
1011         if (ns == NULL) {
1012                 old_lock = ldlm_handle2lock(lockh);
1013                 LASSERT(old_lock);
1014
1015                 ns = old_lock->l_resource->lr_namespace;
1016                 res_id = &old_lock->l_resource->lr_name;
1017                 type = old_lock->l_resource->lr_type;
1018                 mode = old_lock->l_req_mode;
1019         }
1020
1021         res = ldlm_resource_get(ns, NULL, res_id, type, 0);
1022         if (res == NULL) {
1023                 LASSERT(old_lock == NULL);
1024                 RETURN(0);
1025         }
1026
1027         lock_res(res);
1028
1029         lock = search_queue(&res->lr_granted, &mode, policy, old_lock, flags);
1030         if (lock != NULL)
1031                 GOTO(out, rc = 1);
1032         if (flags & LDLM_FL_BLOCK_GRANTED)
1033                 GOTO(out, rc = 0);
1034         lock = search_queue(&res->lr_converting, &mode, policy, old_lock, flags);
1035         if (lock != NULL)
1036                 GOTO(out, rc = 1);
1037         lock = search_queue(&res->lr_waiting, &mode, policy, old_lock, flags);
1038         if (lock != NULL)
1039                 GOTO(out, rc = 1);
1040
1041         EXIT;
1042  out:
1043         unlock_res(res);
1044         ldlm_resource_putref(res);
1045
1046         if (lock) {
1047                 ldlm_lock2handle(lock, lockh);
1048                 if ((flags & LDLM_FL_LVB_READY) &&
1049                     (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1050                         struct l_wait_info lwi;
1051                         if (lock->l_completion_ast) {
1052                                 int err = lock->l_completion_ast(lock,
1053                                                           LDLM_FL_WAIT_NOREPROC,
1054                                                                  NULL);
1055                                 if (err) {
1056                                         if (flags & LDLM_FL_TEST_LOCK)
1057                                                 LDLM_LOCK_PUT(lock);
1058                                         else
1059                                                 ldlm_lock_decref_internal(lock, mode);
1060                                         rc = 0;
1061                                         goto out2;
1062                                 }
1063                         }
1064
1065                         lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout), NULL,
1066                                                LWI_ON_SIGNAL_NOOP, NULL);
1067
1068                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1069                         l_wait_event(lock->l_waitq,
1070                                      (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1071                 }
1072         }
1073  out2:
1074         if (rc) {
1075                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1076                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1077                                 res_id->name[2] : policy->l_extent.start,
1078                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1079                                 res_id->name[3] : policy->l_extent.end);
1080
1081                 /* check user's security context */
1082                 if (lock->l_conn_export &&
1083                     sptlrpc_import_check_ctx(
1084                                 class_exp2cliimp(lock->l_conn_export))) {
1085                         if (!(flags & LDLM_FL_TEST_LOCK))
1086                                 ldlm_lock_decref_internal(lock, mode);
1087                         rc = 0;
1088                 }
1089
1090                 if (flags & LDLM_FL_TEST_LOCK)
1091                         LDLM_LOCK_PUT(lock);
1092
1093         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1094                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1095                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1096                                   type, mode, res_id->name[0], res_id->name[1],
1097                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1098                                         res_id->name[2] :policy->l_extent.start,
1099                                 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1100                                         res_id->name[3] : policy->l_extent.end);
1101         }
1102         if (old_lock)
1103                 LDLM_LOCK_PUT(old_lock);
1104
1105         return rc ? mode : 0;
1106 }
1107
1108 /* Returns a referenced lock */
1109 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1110                                    const struct ldlm_res_id *res_id,
1111                                    ldlm_type_t type,
1112                                    ldlm_mode_t mode,
1113                                    ldlm_blocking_callback blocking,
1114                                    ldlm_completion_callback completion,
1115                                    ldlm_glimpse_callback glimpse,
1116                                    void *data, __u32 lvb_len)
1117 {
1118         struct ldlm_lock *lock;
1119         struct ldlm_resource *res;
1120         ENTRY;
1121
1122         res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1123         if (res == NULL)
1124                 RETURN(NULL);
1125
1126         lock = ldlm_lock_new(res);
1127         ldlm_resource_putref(res);
1128
1129         if (lock == NULL)
1130                 RETURN(NULL);
1131
1132         lock->l_req_mode = mode;
1133         lock->l_ast_data = data;
1134         lock->l_blocking_ast = blocking;
1135         lock->l_completion_ast = completion;
1136         lock->l_glimpse_ast = glimpse;
1137         lock->l_pid = cfs_curproc_pid();
1138
1139         if (lvb_len) {
1140                 lock->l_lvb_len = lvb_len;
1141                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1142                 if (lock->l_lvb_data == NULL) {
1143                         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
1144                         RETURN(NULL);
1145                 }
1146         }
1147
1148         RETURN(lock);
1149 }
1150
1151 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1152                                struct ldlm_lock **lockp,
1153                                void *cookie, int *flags)
1154 {
1155         struct ldlm_lock *lock = *lockp;
1156         struct ldlm_resource *res = lock->l_resource;
1157         int local = ns_is_client(res->lr_namespace);
1158         ldlm_processing_policy policy;
1159         ldlm_error_t rc = ELDLM_OK;
1160         ENTRY;
1161
1162         do_gettimeofday(&lock->l_enqueued_time);
1163         /* policies are not executed on the client or during replay */
1164         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1165             && !local && ns->ns_policy) {
1166                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1167                                    NULL);
1168                 if (rc == ELDLM_LOCK_REPLACED) {
1169                         /* The lock that was returned has already been granted,
1170                          * and placed into lockp.  If it's not the same as the
1171                          * one we passed in, then destroy the old one and our
1172                          * work here is done. */
1173                         if (lock != *lockp) {
1174                                 ldlm_lock_destroy(lock);
1175                                 LDLM_LOCK_PUT(lock);
1176                         }
1177                         *flags |= LDLM_FL_LOCK_CHANGED;
1178                         RETURN(0);
1179                 } else if (rc != ELDLM_OK ||
1180                            (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1181                         ldlm_lock_destroy(lock);
1182                         RETURN(rc);
1183                 }
1184         }
1185
1186         lock_res_and_lock(lock);
1187         if (local && lock->l_req_mode == lock->l_granted_mode) {
1188                 /* The server returned a blocked lock, but it was granted before
1189                  * we got a chance to actually enqueue it.  We don't need to do
1190                  * anything else. */
1191                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1192                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1193                 GOTO(out, ELDLM_OK);
1194         }
1195
1196         /* Some flags from the enqueue want to make it into the AST, via the
1197          * lock's l_flags. */
1198         lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1199
1200         /* This distinction between local lock trees is very important; a client
1201          * namespace only has information about locks taken by that client, and
1202          * thus doesn't have enough information to decide for itself if it can
1203          * be granted (below).  In this case, we do exactly what the server
1204          * tells us to do, as dictated by the 'flags'.
1205          *
1206          * We do exactly the same thing during recovery, when the server is
1207          * more or less trusting the clients not to lie.
1208          *
1209          * FIXME (bug 268): Detect obvious lies by checking compatibility in
1210          * granted/converting queues. */
1211         ldlm_resource_unlink_lock(lock);
1212         if (local) {
1213                 if (*flags & LDLM_FL_BLOCK_CONV)
1214                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1215                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1216                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1217                 else
1218                         ldlm_grant_lock(lock, NULL);
1219                 GOTO(out, ELDLM_OK);
1220         } else if (*flags & LDLM_FL_REPLAY) {
1221                 if (*flags & LDLM_FL_BLOCK_CONV) {
1222                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1223                         GOTO(out, ELDLM_OK);
1224                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1225                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1226                         GOTO(out, ELDLM_OK);
1227                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1228                         ldlm_grant_lock(lock, NULL);
1229                         GOTO(out, ELDLM_OK);
1230                 }
1231                 /* If no flags, fall through to normal enqueue path. */
1232         }
1233
1234         policy = ldlm_processing_policy_table[res->lr_type];
1235         policy(lock, flags, 1, &rc, NULL);
1236         GOTO(out, rc);
1237 out:
1238         unlock_res_and_lock(lock);
1239         return rc;
1240 }
1241
1242 /* Must be called with namespace taken: queue is waiting or converting. */
1243 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
1244                          struct list_head *work_list)
1245 {
1246         struct list_head *tmp, *pos;
1247         ldlm_processing_policy policy;
1248         int flags;
1249         int rc = LDLM_ITER_CONTINUE;
1250         ldlm_error_t err;
1251         ENTRY;
1252
1253         check_res_locked(res);
1254
1255         policy = ldlm_processing_policy_table[res->lr_type];
1256         LASSERT(policy);
1257
1258         list_for_each_safe(tmp, pos, queue) {
1259                 struct ldlm_lock *pending;
1260                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
1261
1262                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1263
1264                 flags = 0;
1265                 rc = policy(pending, &flags, 0, &err, work_list);
1266                 if (rc != LDLM_ITER_CONTINUE)
1267                         break;
1268         }
1269
1270         RETURN(rc);
1271 }
1272
1273 /* Helper function for ldlm_run_ast_work().
1274  *
1275  * Send an existing rpc set specified by @arg->set and then
1276  * destroy it. Create new one if @do_create flag is set. */
1277 static void
1278 ldlm_send_and_maybe_create_set(struct ldlm_cb_set_arg *arg, int do_create)
1279 {
1280         ENTRY;
1281
1282         ptlrpc_set_wait(arg->set);
1283         if (arg->type == LDLM_BL_CALLBACK)
1284                 OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_GLIMPSE, 2);
1285         ptlrpc_set_destroy(arg->set);
1286
1287         if (do_create)
1288                 arg->set = ptlrpc_prep_set();
1289
1290         EXIT;
1291 }
1292
1293 static int
1294 ldlm_work_bl_ast_lock(struct list_head *tmp, struct ldlm_cb_set_arg *arg)
1295 {
1296         struct ldlm_lock_desc d;
1297         struct ldlm_lock *lock = list_entry(tmp, struct ldlm_lock, l_bl_ast);
1298         ENTRY;
1299
1300         /* nobody should touch l_bl_ast */
1301         lock_res_and_lock(lock);
1302         list_del_init(&lock->l_bl_ast);
1303
1304         LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1305         LASSERT(lock->l_bl_ast_run == 0);
1306         LASSERT(lock->l_blocking_lock);
1307         lock->l_bl_ast_run++;
1308         unlock_res_and_lock(lock);
1309
1310         ldlm_lock2desc(lock->l_blocking_lock, &d);
1311
1312         LDLM_LOCK_PUT(lock->l_blocking_lock);
1313         lock->l_blocking_lock = NULL;
1314         lock->l_blocking_ast(lock, &d, (void *)arg,
1315                              LDLM_CB_BLOCKING);
1316         LDLM_LOCK_PUT(lock);
1317
1318         RETURN(1);
1319 }
1320
1321 static int
1322 ldlm_work_cp_ast_lock(struct list_head *tmp, struct ldlm_cb_set_arg *arg)
1323 {
1324         struct ldlm_lock *lock = list_entry(tmp, struct ldlm_lock, l_cp_ast);
1325         ldlm_completion_callback completion_callback;
1326         int rc = 0;
1327         ENTRY;
1328
1329         /* It's possible to receive a completion AST before we've set
1330          * the l_completion_ast pointer: either because the AST arrived
1331          * before the reply, or simply because there's a small race
1332          * window between receiving the reply and finishing the local
1333          * enqueue. (bug 842)
1334          *
1335          * This can't happen with the blocking_ast, however, because we
1336          * will never call the local blocking_ast until we drop our
1337          * reader/writer reference, which we won't do until we get the
1338          * reply and finish enqueueing. */
1339
1340         /* nobody should touch l_cp_ast */
1341         lock_res_and_lock(lock);
1342         list_del_init(&lock->l_cp_ast);
1343         LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1344         /* save l_completion_ast since it can be changed by
1345          * mds_intent_policy(), see bug 14225 */
1346         completion_callback = lock->l_completion_ast;
1347         lock->l_flags &= ~LDLM_FL_CP_REQD;
1348         unlock_res_and_lock(lock);
1349
1350         if (completion_callback != NULL) {
1351                 completion_callback(lock, 0, (void *)arg);
1352                 rc = 1;
1353         }
1354         LDLM_LOCK_PUT(lock);
1355
1356         RETURN(rc);
1357 }
1358
1359 static int
1360 ldlm_work_revoke_ast_lock(struct list_head *tmp, struct ldlm_cb_set_arg *arg)
1361 {
1362         struct ldlm_lock_desc desc;
1363         struct ldlm_lock *lock = list_entry(tmp, struct ldlm_lock, l_export_chain);
1364         ENTRY;
1365
1366         list_del_init(&lock->l_export_chain);
1367
1368         /* the desc just pretend to exclusive */
1369         ldlm_lock2desc(lock, &desc);
1370         desc.l_req_mode = LCK_EX;
1371         desc.l_granted_mode = 0;
1372
1373         lock->l_blocking_ast(lock, &desc, (void*)arg, LDLM_CB_BLOCKING);
1374         LDLM_LOCK_PUT(lock);
1375
1376         RETURN(1);
1377 }
1378
1379 int ldlm_run_ast_work(struct list_head *rpc_list, ldlm_desc_ast_t ast_type)
1380 {
1381         struct ldlm_cb_set_arg arg;
1382         struct list_head *tmp, *pos;
1383         int (*work_ast_lock)(struct list_head *tmp, struct ldlm_cb_set_arg *arg);
1384         int ast_count;
1385         ENTRY;
1386
1387         arg.set = ptlrpc_prep_set();
1388         atomic_set(&arg.restart, 0);
1389         switch (ast_type) {
1390         case LDLM_WORK_BL_AST:
1391                 arg.type = LDLM_BL_CALLBACK;
1392                 work_ast_lock = ldlm_work_bl_ast_lock;
1393                 break;
1394         case LDLM_WORK_CP_AST:
1395                 arg.type = LDLM_CP_CALLBACK;
1396                 work_ast_lock = ldlm_work_cp_ast_lock;
1397                 break;
1398         case LDLM_WORK_REVOKE_AST:
1399                 arg.type = LDLM_BL_CALLBACK;
1400                 work_ast_lock = ldlm_work_revoke_ast_lock;
1401                 break;
1402         default:
1403                 LBUG();
1404         }
1405
1406         ast_count = 0;
1407         list_for_each_safe(tmp, pos, rpc_list) {
1408                 ast_count += work_ast_lock(tmp, &arg);
1409
1410                 /* Send the request set if it exceeds the PARALLEL_AST_LIMIT,
1411                  * and create a new set for requests that remained in
1412                  * @rpc_list */
1413                 if (unlikely(ast_count == PARALLEL_AST_LIMIT)) {
1414                         ldlm_send_and_maybe_create_set(&arg, 1);
1415                         ast_count = 0;
1416                 }
1417         }
1418
1419         if (ast_count > 0)
1420                 ldlm_send_and_maybe_create_set(&arg, 0);
1421         else
1422                 /* In case when number of ASTs is multiply of
1423                  * PARALLEL_AST_LIMIT or @rpc_list was initially empty,
1424                  * @arg.set must be destroyed here, otherwise we get
1425                  * write memory leaking. */
1426                 ptlrpc_set_destroy(arg.set);
1427
1428         RETURN(atomic_read(&arg.restart) ? -ERESTART : 0);
1429 }
1430
1431 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1432 {
1433         ldlm_reprocess_all(res);
1434         return LDLM_ITER_CONTINUE;
1435 }
1436
1437 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1438 {
1439         struct list_head *tmp;
1440         int i, rc;
1441
1442         if (ns == NULL)
1443                 return;
1444
1445         ENTRY;
1446         spin_lock(&ns->ns_hash_lock);
1447         for (i = 0; i < RES_HASH_SIZE; i++) {
1448                 tmp = ns->ns_hash[i].next;
1449                 while (tmp != &(ns->ns_hash[i])) {
1450                         struct ldlm_resource *res =
1451                                 list_entry(tmp, struct ldlm_resource, lr_hash);
1452
1453                         ldlm_resource_getref(res);
1454                         spin_unlock(&ns->ns_hash_lock);
1455
1456                         rc = reprocess_one_queue(res, NULL);
1457
1458                         spin_lock(&ns->ns_hash_lock);
1459                         tmp = tmp->next;
1460                         ldlm_resource_putref_locked(res);
1461
1462                         if (rc == LDLM_ITER_STOP)
1463                                 GOTO(out, rc);
1464                 }
1465         }
1466  out:
1467         spin_unlock(&ns->ns_hash_lock);
1468         EXIT;
1469 }
1470
1471 void ldlm_reprocess_all(struct ldlm_resource *res)
1472 {
1473         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1474         int rc;
1475         ENTRY;
1476
1477         /* Local lock trees don't get reprocessed. */
1478         if (ns_is_client(res->lr_namespace)) {
1479                 EXIT;
1480                 return;
1481         }
1482
1483  restart:
1484         lock_res(res);
1485         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1486         if (rc == LDLM_ITER_CONTINUE)
1487                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1488         unlock_res(res);
1489
1490         rc = ldlm_run_ast_work(&rpc_list, LDLM_WORK_CP_AST);
1491         if (rc == -ERESTART) {
1492                 LASSERT(list_empty(&rpc_list));
1493                 goto restart;
1494         }
1495         EXIT;
1496 }
1497
1498 void ldlm_cancel_callback(struct ldlm_lock *lock)
1499 {
1500         check_res_locked(lock->l_resource);
1501         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1502                 lock->l_flags |= LDLM_FL_CANCEL;
1503                 if (lock->l_blocking_ast) {
1504                         // l_check_no_ns_lock(ns);
1505                         unlock_res_and_lock(lock);
1506                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1507                                              LDLM_CB_CANCELING);
1508                         lock_res_and_lock(lock);
1509                 } else {
1510                         LDLM_DEBUG(lock, "no blocking ast");
1511                 }
1512         }
1513         lock->l_flags |= LDLM_FL_BL_DONE;
1514 }
1515
1516 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1517 {
1518         struct ldlm_lock *lock;
1519
1520         if (req->l_resource->lr_type != LDLM_PLAIN &&
1521             req->l_resource->lr_type != LDLM_IBITS)
1522                 return;
1523
1524         if (LDLM_SL_HEAD(&req->l_sl_mode)) {
1525                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1526                                   l_res_link);
1527                 if (req->l_sl_mode.next == &lock->l_sl_mode) {
1528                         lock->l_sl_mode.prev = NULL;
1529                 } else {
1530                         lock->l_sl_mode.next = req->l_sl_mode.next;
1531                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
1532                 }
1533                 req->l_sl_mode.next = NULL;
1534         } else if (LDLM_SL_TAIL(&req->l_sl_mode)) {
1535                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1536                                   l_res_link);
1537                 if (req->l_sl_mode.prev == &lock->l_sl_mode) {
1538                         lock->l_sl_mode.next = NULL;
1539                 } else {
1540                         lock->l_sl_mode.prev = req->l_sl_mode.prev;
1541                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
1542                 }
1543                 req->l_sl_mode.prev = NULL;
1544         }
1545
1546         if (LDLM_SL_HEAD(&req->l_sl_policy)) {
1547                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1548                                   l_res_link);
1549                 if (req->l_sl_policy.next == &lock->l_sl_policy) {
1550                         lock->l_sl_policy.prev = NULL;
1551                 } else {
1552                         lock->l_sl_policy.next = req->l_sl_policy.next;
1553                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
1554                 }
1555                 req->l_sl_policy.next = NULL;
1556         } else if (LDLM_SL_TAIL(&req->l_sl_policy)) {
1557                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1558                                   l_res_link);
1559                 if (req->l_sl_policy.prev == &lock->l_sl_policy) {
1560                         lock->l_sl_policy.next = NULL;
1561                 } else {
1562                         lock->l_sl_policy.prev = req->l_sl_policy.prev;
1563                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
1564                 }
1565                 req->l_sl_policy.prev = NULL;
1566         }
1567 }
1568
1569 void ldlm_lock_cancel(struct ldlm_lock *lock)
1570 {
1571         struct ldlm_resource *res;
1572         struct ldlm_namespace *ns;
1573         ENTRY;
1574
1575         lock_res_and_lock(lock);
1576
1577         res = lock->l_resource;
1578         ns = res->lr_namespace;
1579
1580         /* Please do not, no matter how tempting, remove this LBUG without
1581          * talking to me first. -phik */
1582         if (lock->l_readers || lock->l_writers) {
1583                 LDLM_ERROR(lock, "lock still has references");
1584                 LBUG();
1585         }
1586
1587         ldlm_del_waiting_lock(lock);
1588
1589         /* Releases cancel callback. */
1590         ldlm_cancel_callback(lock);
1591
1592         /* Yes, second time, just in case it was added again while we were
1593            running with no res lock in ldlm_cancel_callback */
1594         ldlm_del_waiting_lock(lock);
1595         ldlm_resource_unlink_lock(lock);
1596         ldlm_lock_destroy_nolock(lock);
1597
1598         if (lock->l_granted_mode == lock->l_req_mode)
1599                 ldlm_pool_del(&ns->ns_pool, lock);
1600
1601         /* Make sure we will not be called again for same lock what is possible
1602          * if not to zero out lock->l_granted_mode */
1603         lock->l_granted_mode = 0;
1604         unlock_res_and_lock(lock);
1605
1606         EXIT;
1607 }
1608
1609 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1610 {
1611         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1612         ENTRY;
1613
1614         if (lock == NULL)
1615                 RETURN(-EINVAL);
1616
1617         lock->l_ast_data = data;
1618         LDLM_LOCK_PUT(lock);
1619         RETURN(0);
1620 }
1621
1622 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1623 {
1624         struct ldlm_lock *lock;
1625         struct ldlm_resource *res;
1626
1627         spin_lock(&exp->exp_ldlm_data.led_lock);
1628         while(!list_empty(&exp->exp_ldlm_data.led_held_locks)) {
1629                 lock = list_entry(exp->exp_ldlm_data.led_held_locks.next,
1630                                   struct ldlm_lock, l_export_chain);
1631                 res = ldlm_resource_getref(lock->l_resource);
1632                 LDLM_LOCK_GET(lock);
1633                 spin_unlock(&exp->exp_ldlm_data.led_lock);
1634
1635                 LDLM_DEBUG(lock, "export %p", exp);
1636                 ldlm_res_lvbo_update(res, NULL, 0, 1);
1637
1638                 ldlm_lock_cancel(lock);
1639                 ldlm_reprocess_all(res);
1640
1641                 ldlm_resource_putref(res);
1642                 LDLM_LOCK_PUT(lock);
1643                 spin_lock(&exp->exp_ldlm_data.led_lock);
1644         }
1645         spin_unlock(&exp->exp_ldlm_data.led_lock);
1646 }
1647
1648 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1649                                         __u32 *flags)
1650 {
1651         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1652         struct ldlm_resource *res;
1653         struct ldlm_namespace *ns;
1654         int granted = 0;
1655         int old_mode, rc;
1656         struct ldlm_lock *mark_lock = NULL;
1657         int join = LDLM_JOIN_NONE;
1658         ldlm_error_t err;
1659         ENTRY;
1660
1661         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1662                 *flags |= LDLM_FL_BLOCK_GRANTED;
1663                 RETURN(lock->l_resource);
1664         }
1665
1666         LASSERTF(new_mode == LCK_PW && lock->l_granted_mode == LCK_PR,
1667                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1668
1669         lock_res_and_lock(lock);
1670
1671         res = lock->l_resource;
1672         ns = res->lr_namespace;
1673
1674         old_mode = lock->l_req_mode;
1675         lock->l_req_mode = new_mode;
1676         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1677                 /* remember the lock position where the lock might be
1678                  * added back to the granted list later and also
1679                  * remember the join mode for skiplist fixing. */
1680                 if (LDLM_SL_HEAD(&lock->l_sl_mode))
1681                         join = LDLM_MODE_JOIN_RIGHT;
1682                 else if (LDLM_SL_TAIL(&lock->l_sl_mode))
1683                         join = LDLM_MODE_JOIN_LEFT;
1684                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
1685                         join |= LDLM_POLICY_JOIN_RIGHT;
1686                 else if (LDLM_SL_TAIL(&lock->l_sl_policy))
1687                         join |= LDLM_POLICY_JOIN_LEFT;
1688
1689                 LASSERT(!((join & LDLM_MODE_JOIN_RIGHT) &&
1690                           (join & LDLM_POLICY_JOIN_LEFT)));
1691                 LASSERT(!((join & LDLM_MODE_JOIN_LEFT) &&
1692                           (join & LDLM_POLICY_JOIN_RIGHT)));
1693
1694                 if ((join & LDLM_MODE_JOIN_LEFT) ||
1695                     (join & LDLM_POLICY_JOIN_LEFT))
1696                         mark_lock = list_entry(lock->l_res_link.prev,
1697                                                struct ldlm_lock, l_res_link);
1698                 else if (lock->l_res_link.next != &res->lr_granted)
1699                         mark_lock = list_entry(lock->l_res_link.next,
1700                                                struct ldlm_lock, l_res_link);
1701         }
1702         ldlm_resource_unlink_lock(lock);
1703
1704         /* If this is a local resource, put it on the appropriate list. */
1705         if (ns_is_client(res->lr_namespace)) {
1706                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1707                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1708                 } else {
1709                         /* This should never happen, because of the way the
1710                          * server handles conversions. */
1711                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1712                                    *flags);
1713                         LBUG();
1714
1715                         ldlm_grant_lock(lock, &rpc_list);
1716                         granted = 1;
1717                         /* FIXME: completion handling not with ns_lock held ! */
1718                         if (lock->l_completion_ast)
1719                                 lock->l_completion_ast(lock, 0, NULL);
1720                 }
1721         } else {
1722                 int pflags = 0;
1723                 ldlm_processing_policy policy;
1724                 policy = ldlm_processing_policy_table[res->lr_type];
1725                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1726                 if (rc == LDLM_ITER_STOP) {
1727                         lock->l_req_mode = old_mode;
1728                         ldlm_granted_list_add_lock(lock, mark_lock, join);
1729                         res = NULL;
1730                 } else {
1731                         *flags |= LDLM_FL_BLOCK_GRANTED;
1732                         granted = 1;
1733                 }
1734         }
1735         unlock_res_and_lock(lock);
1736
1737         if (granted)
1738                 ldlm_run_ast_work(&rpc_list, LDLM_WORK_CP_AST);
1739         RETURN(res);
1740 }
1741
1742 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1743 {
1744         struct obd_device *obd = NULL;
1745
1746         if (!((libcfs_debug | D_ERROR) & level))
1747                 return;
1748
1749         if (!lock) {
1750                 CDEBUG(level, "  NULL LDLM lock\n");
1751                 return;
1752         }
1753
1754         CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1755                lock, lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1756                pos, lock->l_pid);
1757         if (lock->l_conn_export != NULL)
1758                 obd = lock->l_conn_export->exp_obd;
1759         if (lock->l_export && lock->l_export->exp_connection) {
1760                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1761                      libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1762                      lock->l_remote_handle.cookie);
1763         } else if (obd == NULL) {
1764                 CDEBUG(level, "  Node: local\n");
1765         } else {
1766                 struct obd_import *imp = obd->u.cli.cl_import;
1767                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1768                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1769                        lock->l_remote_handle.cookie);
1770         }
1771         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64"/"LPU64")\n",
1772                   lock->l_resource,
1773                   lock->l_resource->lr_name.name[0],
1774                   lock->l_resource->lr_name.name[1],
1775                   lock->l_resource->lr_name.name[2]);
1776         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1777                "write: %d flags: %#x\n", ldlm_lockname[lock->l_req_mode],
1778                ldlm_lockname[lock->l_granted_mode],
1779                atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1780                lock->l_flags);
1781         if (lock->l_resource->lr_type == LDLM_EXTENT)
1782                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1783                        " (req "LPU64"-"LPU64")\n",
1784                        lock->l_policy_data.l_extent.start,
1785                        lock->l_policy_data.l_extent.end,
1786                        lock->l_req_extent.start, lock->l_req_extent.end);
1787         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1788                 CDEBUG(level, "  Pid: %d Extent: "LPU64" -> "LPU64"\n",
1789                        lock->l_policy_data.l_flock.pid,
1790                        lock->l_policy_data.l_flock.start,
1791                        lock->l_policy_data.l_flock.end);
1792        else if (lock->l_resource->lr_type == LDLM_IBITS)
1793                 CDEBUG(level, "  Bits: "LPX64"\n",
1794                        lock->l_policy_data.l_inodebits.bits);
1795 }
1796
1797 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1798 {
1799         struct ldlm_lock *lock;
1800
1801         if (!((libcfs_debug | D_ERROR) & level))
1802                 return;
1803
1804         lock = ldlm_handle2lock(lockh);
1805         if (lock == NULL)
1806                 return;
1807
1808         ldlm_lock_dump(D_OTHER, lock, 0);
1809
1810         LDLM_LOCK_PUT(lock);
1811 }
1812
1813 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
1814                       struct libcfs_debug_msg_data *data, const char *fmt,
1815                       ...)
1816 {
1817         va_list args;
1818         cfs_debug_limit_state_t *cdls = data->msg_cdls;
1819
1820         va_start(args, fmt);
1821
1822         if (lock->l_resource == NULL) {
1823                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1824                                    data->msg_fn, data->msg_line, fmt, args,
1825                        " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1826                        "res: \?\? rrc=\?\? type: \?\?\? flags: %x remote: "
1827                        LPX64" expref: %d pid: %u\n", lock,
1828                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1829                        lock->l_readers, lock->l_writers,
1830                        ldlm_lockname[lock->l_granted_mode],
1831                        ldlm_lockname[lock->l_req_mode],
1832                        lock->l_flags, lock->l_remote_handle.cookie,
1833                        lock->l_export ?
1834                        atomic_read(&lock->l_export->exp_refcount) : -99,
1835                        lock->l_pid);
1836                 va_end(args);
1837                 return;
1838         }
1839
1840         switch (lock->l_resource->lr_type) {
1841         case LDLM_EXTENT:
1842                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1843                                    data->msg_fn, data->msg_line, fmt, args,
1844                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1845                        "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
1846                        "] (req "LPU64"->"LPU64") flags: %x remote: "LPX64
1847                        " expref: %d pid: %u\n",
1848                        lock->l_resource->lr_namespace->ns_name, lock,
1849                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1850                        lock->l_readers, lock->l_writers,
1851                        ldlm_lockname[lock->l_granted_mode],
1852                        ldlm_lockname[lock->l_req_mode],
1853                        lock->l_resource->lr_name.name[0],
1854                        lock->l_resource->lr_name.name[1],
1855                        atomic_read(&lock->l_resource->lr_refcount),
1856                        ldlm_typename[lock->l_resource->lr_type],
1857                        lock->l_policy_data.l_extent.start,
1858                        lock->l_policy_data.l_extent.end,
1859                        lock->l_req_extent.start, lock->l_req_extent.end,
1860                        lock->l_flags, lock->l_remote_handle.cookie,
1861                        lock->l_export ?
1862                        atomic_read(&lock->l_export->exp_refcount) : -99,
1863                        lock->l_pid);
1864                 break;
1865
1866         case LDLM_FLOCK:
1867                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1868                                    data->msg_fn, data->msg_line, fmt, args,
1869                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1870                        "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "
1871                        "["LPU64"->"LPU64"] flags: %x remote: "LPX64
1872                        " expref: %d pid: %u\n",
1873                        lock->l_resource->lr_namespace->ns_name, lock,
1874                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1875                        lock->l_readers, lock->l_writers,
1876                        ldlm_lockname[lock->l_granted_mode],
1877                        ldlm_lockname[lock->l_req_mode],
1878                        lock->l_resource->lr_name.name[0],
1879                        lock->l_resource->lr_name.name[1],
1880                        atomic_read(&lock->l_resource->lr_refcount),
1881                        ldlm_typename[lock->l_resource->lr_type],
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                        lock->l_flags, lock->l_remote_handle.cookie,
1886                        lock->l_export ?
1887                        atomic_read(&lock->l_export->exp_refcount) : -99,
1888                        lock->l_pid);
1889                 break;
1890
1891         case LDLM_IBITS:
1892                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1893                                    data->msg_fn, data->msg_line, fmt, args,
1894                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1895                        "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
1896                        "flags: %x remote: "LPX64" expref: %d "
1897                        "pid %u\n",
1898                        lock->l_resource->lr_namespace->ns_name,
1899                        lock, lock->l_handle.h_cookie,
1900                        atomic_read (&lock->l_refc),
1901                        lock->l_readers, lock->l_writers,
1902                        ldlm_lockname[lock->l_granted_mode],
1903                        ldlm_lockname[lock->l_req_mode],
1904                        lock->l_resource->lr_name.name[0],
1905                        lock->l_resource->lr_name.name[1],
1906                        lock->l_policy_data.l_inodebits.bits,
1907                        atomic_read(&lock->l_resource->lr_refcount),
1908                        ldlm_typename[lock->l_resource->lr_type],
1909                        lock->l_flags, lock->l_remote_handle.cookie,
1910                        lock->l_export ?
1911                        atomic_read(&lock->l_export->exp_refcount) : -99,
1912                        lock->l_pid);
1913                 break;
1914
1915         default:
1916                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1917                                    data->msg_fn, data->msg_line, fmt, args,
1918                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1919                        "res: "LPU64"/"LPU64" rrc: %d type: %s flags: %x "
1920                        "remote: "LPX64" expref: %d pid: %u\n",
1921                        lock->l_resource->lr_namespace->ns_name,
1922                        lock, lock->l_handle.h_cookie,
1923                        atomic_read (&lock->l_refc),
1924                        lock->l_readers, lock->l_writers,
1925                        ldlm_lockname[lock->l_granted_mode],
1926                        ldlm_lockname[lock->l_req_mode],
1927                        lock->l_resource->lr_name.name[0],
1928                        lock->l_resource->lr_name.name[1],
1929                        atomic_read(&lock->l_resource->lr_refcount),
1930                        ldlm_typename[lock->l_resource->lr_type],
1931                        lock->l_flags, lock->l_remote_handle.cookie,
1932                        lock->l_export ?
1933                        atomic_read(&lock->l_export->exp_refcount) : -99,
1934                        lock->l_pid);
1935                 break;
1936         }
1937         va_end(args);
1938 }
1939 EXPORT_SYMBOL(_ldlm_lock_debug);