lustre/ldlm/ldlm_lock.c

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