lustre/ldlm/ldlm_lock.c

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