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