lustre/ldlm/ldlm_lock.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of the Lustre file system, http://www.lustre.org
   9  *   Lustre is a trademark of Cluster File Systems, Inc.
  10  *
  11  *   You may have signed or agreed to another license before downloading
  12  *   this software.  If so, you are bound by the terms and conditions
  13  *   of that agreement, and the following does not apply to you.  See the
  14  *   LICENSE file included with this distribution for more information.
  15  *
  16  *   If you did not agree to a different license, then this copy of Lustre
  17  *   is open source software; you can redistribute it and/or modify it
  18  *   under the terms of version 2 of the GNU General Public License as
  19  *   published by the Free Software Foundation.
  20  *
  21  *   In either case, Lustre is distributed in the hope that it will be
  22  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  23  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *   license text for more details.
  25  */
  26
  27 #define DEBUG_SUBSYSTEM S_LDLM
  28
  29 #ifdef __KERNEL__
  30 # include <libcfs/libcfs.h>
  31 # include <linux/lustre_intent.h>
  32 #else
  33 # include <liblustre.h>
  34 # include <libcfs/kp30.h>
  35 #endif
  36
  37 #include <obd_class.h>
  38 #include "ldlm_internal.h"
  39
  40 /* lock's skip list pointers fix mode */
  41 #define LDLM_JOIN_NONE          0
  42 #define LDLM_MODE_JOIN_RIGHT    1
  43 #define LDLM_MODE_JOIN_LEFT     (1 << 1)
  44 #define LDLM_POLICY_JOIN_RIGHT  (1 << 2)
  45 #define LDLM_POLICY_JOIN_LEFT   (1 << 3)
  46
  47 /* lock types */
  48 char *ldlm_lockname[] = {
  49         [0] "--",
  50         [LCK_EX] "EX",
  51         [LCK_PW] "PW",
  52         [LCK_PR] "PR",
  53         [LCK_CW] "CW",
  54         [LCK_CR] "CR",
  55         [LCK_NL] "NL",
  56         [LCK_GROUP] "GROUP"
  57 };
  58
  59 char *ldlm_typename[] = {
  60         [LDLM_PLAIN] "PLN",
  61         [LDLM_EXTENT] "EXT",
  62         [LDLM_FLOCK] "FLK",
  63         [LDLM_IBITS] "IBT",
  64 };
  65
  66 char *ldlm_it2str(int it)
  67 {
  68         switch (it) {
  69         case IT_OPEN:
  70                 return "open";
  71         case IT_CREAT:
  72                 return "creat";
  73         case (IT_OPEN | IT_CREAT):
  74                 return "open|creat";
  75         case IT_READDIR:
  76                 return "readdir";
  77         case IT_GETATTR:
  78                 return "getattr";
  79         case IT_LOOKUP:
  80                 return "lookup";
  81         case IT_UNLINK:
  82                 return "unlink";
  83         case IT_GETXATTR:
  84                 return "getxattr";
  85         default:
  86                 CERROR("Unknown intent %d\n", it);
  87                 return "UNKNOWN";
  88         }
  89 }
  90
  91 extern cfs_mem_cache_t *ldlm_lock_slab;
  92
  93 static ldlm_processing_policy ldlm_processing_policy_table[] = {
  94         [LDLM_PLAIN] ldlm_process_plain_lock,
  95         [LDLM_EXTENT] ldlm_process_extent_lock,
  96 #ifdef __KERNEL__
  97         [LDLM_FLOCK] ldlm_process_flock_lock,
  98 #endif
  99         [LDLM_IBITS] ldlm_process_inodebits_lock,
 100 };
 101
 102 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
 103 {
 104         return ldlm_processing_policy_table[res->lr_type];
 105 }
 106
 107 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
 108 {
 109         ns->ns_policy = arg;
 110 }
 111
 112 /*
 113  * REFCOUNTED LOCK OBJECTS
 114  */
 115
 116
 117 /*
 118  * Lock refcounts, during creation:
 119  *   - one special one for allocation, dec'd only once in destroy
 120  *   - one for being a lock that's in-use
 121  *   - one for the addref associated with a new lock
 122  */
 123 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
 124 {
 125         atomic_inc(&lock->l_refc);
 126         return lock;
 127 }
 128
 129 static void ldlm_lock_free(struct ldlm_lock *lock, size_t size)
 130 {
 131         LASSERT(size == sizeof(*lock));
 132         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
 133 }
 134
 135 void ldlm_lock_put(struct ldlm_lock *lock)
 136 {
 137         ENTRY;
 138
 139         LASSERT(lock->l_resource != LP_POISON);
 140         LASSERT(atomic_read(&lock->l_refc) > 0);
 141         if (atomic_dec_and_test(&lock->l_refc)) {
 142                 struct ldlm_resource *res;
 143
 144                 LDLM_DEBUG(lock,
 145                            "final lock_put on destroyed lock, freeing it.");
 146
 147                 res = lock->l_resource;
 148                 LASSERT(lock->l_destroyed);
 149                 LASSERT(list_empty(&lock->l_res_link));
 150                 LASSERT(list_empty(&lock->l_pending_chain));
 151
 152                 if (lock->l_parent)
 153                         LDLM_LOCK_PUT(lock->l_parent);
 154
 155                 atomic_dec(&res->lr_namespace->ns_locks);
 156                 ldlm_resource_putref(res);
 157                 lock->l_resource = NULL;
 158                 if (lock->l_export) {
 159                         class_export_put(lock->l_export);
 160                         lock->l_export = NULL;
 161                 }
 162
 163                 if (lock->l_lvb_data != NULL)
 164                         OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
 165
 166                 OBD_FREE_RCU_CB(lock, sizeof(*lock), &lock->l_handle,
 167                                 ldlm_lock_free);
 168         }
 169
 170         EXIT;
 171 }
 172
 173 int ldlm_lock_remove_from_lru_nolock(struct ldlm_lock *lock)
 174 {
 175         int rc = 0;
 176         if (!list_empty(&lock->l_lru)) {
 177                 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 178                 list_del_init(&lock->l_lru);
 179                 lock->l_resource->lr_namespace->ns_nr_unused--;
 180                 LASSERT(lock->l_resource->lr_namespace->ns_nr_unused >= 0);
 181                 rc = 1;
 182         }
 183         return rc;
 184 }
 185
 186 int ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
 187 {
 188         int rc;
 189         ENTRY;
 190         spin_lock(&lock->l_resource->lr_namespace->ns_unused_lock);
 191         rc = ldlm_lock_remove_from_lru_nolock(lock);
 192         spin_unlock(&lock->l_resource->lr_namespace->ns_unused_lock);
 193         EXIT;
 194         return rc;
 195 }
 196
 197 /* This used to have a 'strict' flag, which recovery would use to mark an
 198  * in-use lock as needing-to-die.  Lest I am ever tempted to put it back, I
 199  * shall explain why it's gone: with the new hash table scheme, once you call
 200  * ldlm_lock_destroy, you can never drop your final references on this lock.
 201  * Because it's not in the hash table anymore.  -phil */
 202 int ldlm_lock_destroy_internal(struct ldlm_lock *lock)
 203 {
 204         ENTRY;
 205
 206         if (!list_empty(&lock->l_children)) {
 207                 LDLM_ERROR(lock, "still has children (%p)!",
 208                            lock->l_children.next);
 209                 ldlm_lock_dump(D_ERROR, lock, 0);
 210                 LBUG();
 211         }
 212         if (lock->l_readers || lock->l_writers) {
 213                 LDLM_ERROR(lock, "lock still has references");
 214                 ldlm_lock_dump(D_ERROR, lock, 0);
 215                 LBUG();
 216         }
 217
 218         if (!list_empty(&lock->l_res_link)) {
 219                 LDLM_ERROR(lock, "lock still on resource");
 220                 ldlm_lock_dump(D_ERROR, lock, 0);
 221                 LBUG();
 222         }
 223
 224         if (lock->l_destroyed) {
 225                 LASSERT(list_empty(&lock->l_lru));
 226                 EXIT;
 227                 return 0;
 228         }
 229         lock->l_destroyed = 1;
 230
 231         if (lock->l_export)
 232                 spin_lock(&lock->l_export->exp_ldlm_data.led_lock);
 233         list_del_init(&lock->l_export_chain);
 234         if (lock->l_export)
 235                 spin_unlock(&lock->l_export->exp_ldlm_data.led_lock);
 236
 237         ldlm_lock_remove_from_lru(lock);
 238         class_handle_unhash(&lock->l_handle);
 239
 240 #if 0
 241         /* Wake anyone waiting for this lock */
 242         /* FIXME: I should probably add yet another flag, instead of using
 243          * l_export to only call this on clients */
 244         if (lock->l_export)
 245                 class_export_put(lock->l_export);
 246         lock->l_export = NULL;
 247         if (lock->l_export && lock->l_completion_ast)
 248                 lock->l_completion_ast(lock, 0);
 249 #endif
 250         EXIT;
 251         return 1;
 252 }
 253
 254 void ldlm_lock_destroy(struct ldlm_lock *lock)
 255 {
 256         int first;
 257         ENTRY;
 258         lock_res_and_lock(lock);
 259         first = ldlm_lock_destroy_internal(lock);
 260         unlock_res_and_lock(lock);
 261
 262         /* drop reference from hashtable only for first destroy */
 263         if (first)
 264                 LDLM_LOCK_PUT(lock);
 265         EXIT;
 266 }
 267
 268 void ldlm_lock_destroy_nolock(struct ldlm_lock *lock)
 269 {
 270         int first;
 271         ENTRY;
 272         first = ldlm_lock_destroy_internal(lock);
 273         /* drop reference from hashtable only for first destroy */
 274         if (first)
 275                 LDLM_LOCK_PUT(lock);
 276         EXIT;
 277 }
 278
 279 /* this is called by portals_handle2object with the handle lock taken */
 280 static void lock_handle_addref(void *lock)
 281 {
 282         LDLM_LOCK_GET((struct ldlm_lock *)lock);
 283 }
 284
 285 /*
 286  * usage: pass in a resource on which you have done ldlm_resource_get
 287  *        pass in a parent lock on which you have done a ldlm_lock_get
 288  *        after return, ldlm_*_put the resource and parent
 289  * returns: lock with refcount 2 - one for current caller and one for remote
 290  */
 291 static struct ldlm_lock *ldlm_lock_new(struct ldlm_lock *parent,
 292                                        struct ldlm_resource *resource)
 293 {
 294         struct ldlm_lock *lock;
 295         ENTRY;
 296
 297         if (resource == NULL)
 298                 LBUG();
 299
 300         OBD_SLAB_ALLOC(lock, ldlm_lock_slab, CFS_ALLOC_IO, sizeof(*lock));
 301         if (lock == NULL)
 302                 RETURN(NULL);
 303
 304         lock->l_resource = ldlm_resource_getref(resource);
 305
 306         atomic_set(&lock->l_refc, 2);
 307         CFS_INIT_LIST_HEAD(&lock->l_children);
 308         CFS_INIT_LIST_HEAD(&lock->l_res_link);
 309         CFS_INIT_LIST_HEAD(&lock->l_lru);
 310         CFS_INIT_LIST_HEAD(&lock->l_export_chain);
 311         CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
 312         CFS_INIT_LIST_HEAD(&lock->l_tmp);
 313         CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
 314         CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
 315         cfs_waitq_init(&lock->l_waitq);
 316         lock->l_blocking_lock = NULL;
 317         lock->l_pidb = 0;
 318         lock->l_sl_mode.prev = NULL;
 319         lock->l_sl_mode.next = NULL;
 320         lock->l_sl_policy.prev = NULL;
 321         lock->l_sl_policy.next = NULL;
 322
 323         atomic_inc(&resource->lr_namespace->ns_locks);
 324
 325         if (parent != NULL) {
 326                 spin_lock(&resource->lr_namespace->ns_hash_lock);
 327                 lock->l_parent = LDLM_LOCK_GET(parent);
 328                 list_add(&lock->l_childof, &parent->l_children);
 329                 spin_unlock(&resource->lr_namespace->ns_hash_lock);
 330         }
 331
 332         CFS_INIT_LIST_HEAD(&lock->l_handle.h_link);
 333         class_handle_hash(&lock->l_handle, lock_handle_addref);
 334
 335         RETURN(lock);
 336 }
 337
 338 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
 339                               const struct ldlm_res_id *new_resid)
 340 {
 341         struct ldlm_resource *oldres = lock->l_resource;
 342         struct ldlm_resource *newres;
 343         int type;
 344         ENTRY;
 345
 346         LASSERT(ns->ns_client != 0);
 347
 348         lock_res_and_lock(lock);
 349         if (memcmp(new_resid, &lock->l_resource->lr_name,
 350                    sizeof(lock->l_resource->lr_name)) == 0) {
 351                 /* Nothing to do */
 352                 unlock_res_and_lock(lock);
 353                 RETURN(0);
 354         }
 355
 356         LASSERT(new_resid->name[0] != 0);
 357
 358         /* This function assumes that the lock isn't on any lists */
 359         LASSERT(list_empty(&lock->l_res_link));
 360
 361         type = oldres->lr_type;
 362         unlock_res_and_lock(lock);
 363
 364         newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
 365         if (newres == NULL) {
 366                 LBUG();
 367                 RETURN(-ENOMEM);
 368         }
 369
 370         lock_res_and_lock(lock);
 371         LASSERT(memcmp(new_resid, &lock->l_resource->lr_name,
 372                        sizeof(lock->l_resource->lr_name)) != 0);
 373         lock_res(newres);
 374         lock->l_resource = newres;
 375         unlock_res(newres);
 376         unlock_res(oldres);
 377         unlock_bitlock(lock);
 378
 379         /* ...and the flowers are still standing! */
 380         ldlm_resource_putref(oldres);
 381
 382         RETURN(0);
 383 }
 384
 385 /*
 386  *  HANDLES
 387  */
 388
 389 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
 390 {
 391         lockh->cookie = lock->l_handle.h_cookie;
 392 }
 393
 394 /* if flags: atomically get the lock and set the flags.
 395  *           Return NULL if flag already set
 396  */
 397
 398 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
 399                                      int flags)
 400 {
 401         struct ldlm_namespace *ns;
 402         struct ldlm_lock *lock, *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                                       const 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  * we also check security context, if that failed we simply return 0 (to keep
 975  * caller code unchanged), the context failure will be discovered by caller
 976  * sometime later.
 977  */
 978 int ldlm_lock_match(struct ldlm_namespace *ns, int flags,
 979                     const struct ldlm_res_id *res_id, ldlm_type_t type,
 980                     ldlm_policy_data_t *policy, ldlm_mode_t mode,
 981                     struct lustre_handle *lockh)
 982 {
 983         struct ldlm_resource *res;
 984         struct ldlm_lock *lock, *old_lock = NULL;
 985         int rc = 0;
 986         ENTRY;
 987
 988         if (ns == NULL) {
 989                 old_lock = ldlm_handle2lock(lockh);
 990                 LASSERT(old_lock);
 991
 992                 ns = old_lock->l_resource->lr_namespace;
 993                 res_id = &old_lock->l_resource->lr_name;
 994                 type = old_lock->l_resource->lr_type;
 995                 mode = old_lock->l_req_mode;
 996         }
 997
 998         res = ldlm_resource_get(ns, NULL, res_id, type, 0);
 999         if (res == NULL) {
1000                 LASSERT(old_lock == NULL);
1001                 RETURN(0);
1002         }
1003
1004         lock_res(res);
1005
1006         lock = search_queue(&res->lr_granted, mode, policy, old_lock, flags);
1007         if (lock != NULL)
1008                 GOTO(out, rc = 1);
1009         if (flags & LDLM_FL_BLOCK_GRANTED)
1010                 GOTO(out, rc = 0);
1011         lock = search_queue(&res->lr_converting, mode, policy, old_lock, flags);
1012         if (lock != NULL)
1013                 GOTO(out, rc = 1);
1014         lock = search_queue(&res->lr_waiting, mode, policy, old_lock, flags);
1015         if (lock != NULL)
1016                 GOTO(out, rc = 1);
1017
1018         EXIT;
1019  out:
1020         unlock_res(res);
1021         ldlm_resource_putref(res);
1022
1023         if (lock) {
1024                 ldlm_lock2handle(lock, lockh);
1025                 if ((flags & LDLM_FL_LVB_READY) &&
1026                     (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1027                         struct l_wait_info lwi;
1028                         if (lock->l_completion_ast) {
1029                                 int err = lock->l_completion_ast(lock,
1030                                                           LDLM_FL_WAIT_NOREPROC,
1031                                                                  NULL);
1032                                 if (err) {
1033                                         if (flags & LDLM_FL_TEST_LOCK)
1034                                                 LDLM_LOCK_PUT(lock);
1035                                         else
1036                                                 ldlm_lock_decref_internal(lock, mode);
1037                                         rc = 0;
1038                                         goto out2;
1039                                 }
1040                         }
1041
1042                         lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout), NULL,
1043                                                LWI_ON_SIGNAL_NOOP, NULL);
1044
1045                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1046                         l_wait_event(lock->l_waitq,
1047                                      (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1048                 }
1049         }
1050  out2:
1051         if (rc) {
1052                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1053                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1054                                 res_id->name[2] : policy->l_extent.start,
1055                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1056                                 res_id->name[3] : policy->l_extent.end);
1057
1058                 /* check user's security context */
1059                 if (lock->l_conn_export &&
1060                     sptlrpc_import_check_ctx(
1061                                 class_exp2cliimp(lock->l_conn_export))) {
1062                         if (!(flags & LDLM_FL_TEST_LOCK))
1063                                 ldlm_lock_decref_internal(lock, mode);
1064                         rc = 0;
1065                 }
1066
1067                 if (flags & LDLM_FL_TEST_LOCK)
1068                         LDLM_LOCK_PUT(lock);
1069
1070         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1071                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1072                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1073                                   type, mode, res_id->name[0], res_id->name[1],
1074                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1075                                         res_id->name[2] :policy->l_extent.start,
1076                                 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1077                                         res_id->name[3] : policy->l_extent.end);
1078         }
1079         if (old_lock)
1080                 LDLM_LOCK_PUT(old_lock);
1081
1082         return rc;
1083 }
1084
1085 /* Returns a referenced lock */
1086 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1087                                    const struct lustre_handle *parent_lock_handle,
1088                                    const struct ldlm_res_id *res_id,
1089                                    ldlm_type_t type,
1090                                    ldlm_mode_t mode,
1091                                    ldlm_blocking_callback blocking,
1092                                    ldlm_completion_callback completion,
1093                                    ldlm_glimpse_callback glimpse,
1094                                    void *data, __u32 lvb_len)
1095 {
1096         struct ldlm_resource *res, *parent_res = NULL;
1097         struct ldlm_lock *lock, *parent_lock = NULL;
1098         ENTRY;
1099
1100         if (parent_lock_handle) {
1101                 parent_lock = ldlm_handle2lock(parent_lock_handle);
1102                 if (parent_lock)
1103                         parent_res = parent_lock->l_resource;
1104         }
1105
1106         res = ldlm_resource_get(ns, parent_res, res_id, type, 1);
1107         if (res == NULL)
1108                 RETURN(NULL);
1109
1110         lock = ldlm_lock_new(parent_lock, res);
1111         ldlm_resource_putref(res);
1112         if (parent_lock != NULL)
1113                 LDLM_LOCK_PUT(parent_lock);
1114
1115         if (lock == NULL)
1116                 RETURN(NULL);
1117
1118         lock->l_req_mode = mode;
1119         lock->l_ast_data = data;
1120         lock->l_blocking_ast = blocking;
1121         lock->l_completion_ast = completion;
1122         lock->l_glimpse_ast = glimpse;
1123         lock->l_pid = cfs_curproc_pid();
1124
1125         if (lvb_len) {
1126                 lock->l_lvb_len = lvb_len;
1127                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1128                 if (lock->l_lvb_data == NULL) {
1129                         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
1130                         RETURN(NULL);
1131                 }
1132         }
1133
1134         RETURN(lock);
1135 }
1136
1137 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1138                                struct ldlm_lock **lockp,
1139                                void *cookie, int *flags)
1140 {
1141         struct ldlm_lock *lock = *lockp;
1142         struct ldlm_resource *res = lock->l_resource;
1143         int local = res->lr_namespace->ns_client;
1144         ldlm_processing_policy policy;
1145         ldlm_error_t rc = ELDLM_OK;
1146         ENTRY;
1147
1148         do_gettimeofday(&lock->l_enqueued_time);
1149         /* policies are not executed on the client or during replay */
1150         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1151             && !local && ns->ns_policy) {
1152                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1153                                    NULL);
1154                 if (rc == ELDLM_LOCK_REPLACED) {
1155                         /* The lock that was returned has already been granted,
1156                          * and placed into lockp.  If it's not the same as the
1157                          * one we passed in, then destroy the old one and our
1158                          * work here is done. */
1159                         if (lock != *lockp) {
1160                                 ldlm_lock_destroy(lock);
1161                                 LDLM_LOCK_PUT(lock);
1162                         }
1163                         *flags |= LDLM_FL_LOCK_CHANGED;
1164                         RETURN(0);
1165                 } else if (rc != ELDLM_OK ||
1166                            (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1167                         ldlm_lock_destroy(lock);
1168                         RETURN(rc);
1169                 }
1170         }
1171
1172         lock_res_and_lock(lock);
1173         if (local && lock->l_req_mode == lock->l_granted_mode) {
1174                 /* The server returned a blocked lock, but it was granted before
1175                  * we got a chance to actually enqueue it.  We don't need to do
1176                  * anything else. */
1177                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1178                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1179                 GOTO(out, ELDLM_OK);
1180         }
1181
1182         /* Some flags from the enqueue want to make it into the AST, via the
1183          * lock's l_flags. */
1184         lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1185
1186         /* This distinction between local lock trees is very important; a client
1187          * namespace only has information about locks taken by that client, and
1188          * thus doesn't have enough information to decide for itself if it can
1189          * be granted (below).  In this case, we do exactly what the server
1190          * tells us to do, as dictated by the 'flags'.
1191          *
1192          * We do exactly the same thing during recovery, when the server is
1193          * more or less trusting the clients not to lie.
1194          *
1195          * FIXME (bug 268): Detect obvious lies by checking compatibility in
1196          * granted/converting queues. */
1197         ldlm_resource_unlink_lock(lock);
1198         if (local) {
1199                 if (*flags & LDLM_FL_BLOCK_CONV)
1200                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1201                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1202                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1203                 else
1204                         ldlm_grant_lock(lock, NULL);
1205                 GOTO(out, ELDLM_OK);
1206         } else if (*flags & LDLM_FL_REPLAY) {
1207                 if (*flags & LDLM_FL_BLOCK_CONV) {
1208                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1209                         GOTO(out, ELDLM_OK);
1210                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1211                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1212                         GOTO(out, ELDLM_OK);
1213                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1214                         ldlm_grant_lock(lock, NULL);
1215                         GOTO(out, ELDLM_OK);
1216                 }
1217                 /* If no flags, fall through to normal enqueue path. */
1218         }
1219
1220         policy = ldlm_processing_policy_table[res->lr_type];
1221         policy(lock, flags, 1, &rc, NULL);
1222         GOTO(out, rc);
1223 out:
1224         unlock_res_and_lock(lock);
1225         return rc;
1226 }
1227
1228 /* Must be called with namespace taken: queue is waiting or converting. */
1229 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
1230                          struct list_head *work_list)
1231 {
1232         struct list_head *tmp, *pos;
1233         ldlm_processing_policy policy;
1234         int flags;
1235         int rc = LDLM_ITER_CONTINUE;
1236         ldlm_error_t err;
1237         ENTRY;
1238
1239         check_res_locked(res);
1240
1241         policy = ldlm_processing_policy_table[res->lr_type];
1242         LASSERT(policy);
1243
1244         list_for_each_safe(tmp, pos, queue) {
1245                 struct ldlm_lock *pending;
1246                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
1247
1248                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1249
1250                 flags = 0;
1251                 rc = policy(pending, &flags, 0, &err, work_list);
1252                 if (rc != LDLM_ITER_CONTINUE)
1253                         break;
1254         }
1255
1256         RETURN(rc);
1257 }
1258
1259 int ldlm_run_bl_ast_work(struct list_head *rpc_list)
1260 {
1261         struct list_head *tmp, *pos;
1262         struct ldlm_lock_desc d;
1263         int rc = 0, retval = 0;
1264         ENTRY;
1265
1266         list_for_each_safe(tmp, pos, rpc_list) {
1267                 struct ldlm_lock *lock =
1268                         list_entry(tmp, struct ldlm_lock, l_bl_ast);
1269
1270                 /* nobody should touch l_bl_ast */
1271                 lock_res_and_lock(lock);
1272                 list_del_init(&lock->l_bl_ast);
1273
1274                 LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1275                 LASSERT(lock->l_bl_ast_run == 0);
1276                 LASSERT(lock->l_blocking_lock);
1277                 lock->l_bl_ast_run++;
1278                 unlock_res_and_lock(lock);
1279
1280                 ldlm_lock2desc(lock->l_blocking_lock, &d);
1281
1282                 LDLM_LOCK_PUT(lock->l_blocking_lock);
1283                 lock->l_blocking_lock = NULL;
1284                 rc = lock->l_blocking_ast(lock, &d, NULL, LDLM_CB_BLOCKING);
1285
1286                 if (rc == -ERESTART)
1287                         retval = rc;
1288                 else if (rc)
1289                         CDEBUG(D_DLMTRACE, "Failed AST - should clean & "
1290                                "disconnect client\n");
1291                 LDLM_LOCK_PUT(lock);
1292         }
1293         RETURN(retval);
1294 }
1295
1296 int ldlm_run_cp_ast_work(struct list_head *rpc_list)
1297 {
1298         struct list_head *tmp, *pos;
1299         int rc = 0, retval = 0;
1300         ENTRY;
1301
1302         /* It's possible to receive a completion AST before we've set
1303          * the l_completion_ast pointer: either because the AST arrived
1304          * before the reply, or simply because there's a small race
1305          * window between receiving the reply and finishing the local
1306          * enqueue. (bug 842)
1307          *
1308          * This can't happen with the blocking_ast, however, because we
1309          * will never call the local blocking_ast until we drop our
1310          * reader/writer reference, which we won't do until we get the
1311          * reply and finish enqueueing. */
1312
1313         list_for_each_safe(tmp, pos, rpc_list) {
1314                 struct ldlm_lock *lock =
1315                         list_entry(tmp, struct ldlm_lock, l_cp_ast);
1316
1317                 /* nobody should touch l_cp_ast */
1318                 lock_res_and_lock(lock);
1319                 list_del_init(&lock->l_cp_ast);
1320                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1321                 lock->l_flags &= ~LDLM_FL_CP_REQD;
1322                 unlock_res_and_lock(lock);
1323
1324                 if (lock->l_completion_ast != NULL)
1325                         rc = lock->l_completion_ast(lock, 0, 0);
1326                 if (rc == -ERESTART)
1327                         retval = rc;
1328                 else if (rc)
1329                         CDEBUG(D_DLMTRACE, "Failed AST - should clean & "
1330                                "disconnect client\n");
1331                 LDLM_LOCK_PUT(lock);
1332         }
1333         RETURN(retval);
1334 }
1335
1336 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1337 {
1338         ldlm_reprocess_all(res);
1339         return LDLM_ITER_CONTINUE;
1340 }
1341
1342 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1343 {
1344         struct list_head *tmp;
1345         int i, rc;
1346
1347         if (ns == NULL)
1348                 return;
1349
1350         ENTRY;
1351         spin_lock(&ns->ns_hash_lock);
1352         for (i = 0; i < RES_HASH_SIZE; i++) {
1353                 tmp = ns->ns_hash[i].next;
1354                 while (tmp != &(ns->ns_hash[i])) {
1355                         struct ldlm_resource *res =
1356                                 list_entry(tmp, struct ldlm_resource, lr_hash);
1357
1358                         ldlm_resource_getref(res);
1359                         spin_unlock(&ns->ns_hash_lock);
1360
1361                         rc = reprocess_one_queue(res, NULL);
1362
1363                         spin_lock(&ns->ns_hash_lock);
1364                         tmp = tmp->next;
1365                         ldlm_resource_putref_locked(res);
1366
1367                         if (rc == LDLM_ITER_STOP)
1368                                 GOTO(out, rc);
1369                 }
1370         }
1371  out:
1372         spin_unlock(&ns->ns_hash_lock);
1373         EXIT;
1374 }
1375
1376 void ldlm_reprocess_all(struct ldlm_resource *res)
1377 {
1378         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1379         int rc;
1380         ENTRY;
1381
1382         /* Local lock trees don't get reprocessed. */
1383         if (res->lr_namespace->ns_client) {
1384                 EXIT;
1385                 return;
1386         }
1387
1388  restart:
1389         lock_res(res);
1390         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1391         if (rc == LDLM_ITER_CONTINUE)
1392                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1393         unlock_res(res);
1394
1395         rc = ldlm_run_cp_ast_work(&rpc_list);
1396         if (rc == -ERESTART) {
1397                 LASSERT(list_empty(&rpc_list));
1398                 goto restart;
1399         }
1400         EXIT;
1401 }
1402
1403 void ldlm_cancel_callback(struct ldlm_lock *lock)
1404 {
1405         check_res_locked(lock->l_resource);
1406         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1407                 lock->l_flags |= LDLM_FL_CANCEL;
1408                 if (lock->l_blocking_ast) {
1409                         // l_check_no_ns_lock(ns);
1410                         unlock_res_and_lock(lock);
1411                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1412                                              LDLM_CB_CANCELING);
1413                         lock_res_and_lock(lock);
1414                 } else {
1415                         LDLM_DEBUG(lock, "no blocking ast");
1416                 }
1417         }
1418 }
1419
1420 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1421 {
1422         struct ldlm_lock *lock;
1423
1424         if (req->l_resource->lr_type != LDLM_PLAIN &&
1425             req->l_resource->lr_type != LDLM_IBITS)
1426                 return;
1427
1428         if (LDLM_SL_HEAD(&req->l_sl_mode)) {
1429                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1430                                   l_res_link);
1431                 if (req->l_sl_mode.next == &lock->l_sl_mode) {
1432                         lock->l_sl_mode.prev = NULL;
1433                 } else {
1434                         lock->l_sl_mode.next = req->l_sl_mode.next;
1435                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
1436                 }
1437                 req->l_sl_mode.next = NULL;
1438         } else if (LDLM_SL_TAIL(&req->l_sl_mode)) {
1439                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1440                                   l_res_link);
1441                 if (req->l_sl_mode.prev == &lock->l_sl_mode) {
1442                         lock->l_sl_mode.next = NULL;
1443                 } else {
1444                         lock->l_sl_mode.prev = req->l_sl_mode.prev;
1445                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
1446                 }
1447                 req->l_sl_mode.prev = NULL;
1448         }
1449
1450         if (LDLM_SL_HEAD(&req->l_sl_policy)) {
1451                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1452                                   l_res_link);
1453                 if (req->l_sl_policy.next == &lock->l_sl_policy) {
1454                         lock->l_sl_policy.prev = NULL;
1455                 } else {
1456                         lock->l_sl_policy.next = req->l_sl_policy.next;
1457                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
1458                 }
1459                 req->l_sl_policy.next = NULL;
1460         } else if (LDLM_SL_TAIL(&req->l_sl_policy)) {
1461                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1462                                   l_res_link);
1463                 if (req->l_sl_policy.prev == &lock->l_sl_policy) {
1464                         lock->l_sl_policy.next = NULL;
1465                 } else {
1466                         lock->l_sl_policy.prev = req->l_sl_policy.prev;
1467                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
1468                 }
1469                 req->l_sl_policy.prev = NULL;
1470         }
1471 }
1472
1473 void ldlm_lock_cancel(struct ldlm_lock *lock)
1474 {
1475         struct ldlm_resource *res;
1476         struct ldlm_namespace *ns;
1477         ENTRY;
1478
1479         lock_res_and_lock(lock);
1480
1481         res = lock->l_resource;
1482         ns = res->lr_namespace;
1483
1484         /* Please do not, no matter how tempting, remove this LBUG without
1485          * talking to me first. -phik */
1486         if (lock->l_readers || lock->l_writers) {
1487                 LDLM_ERROR(lock, "lock still has references");
1488                 LBUG();
1489         }
1490
1491         ldlm_del_waiting_lock(lock);
1492
1493         /* Releases cancel callback. */
1494         ldlm_cancel_callback(lock);
1495
1496         /* Yes, second time, just in case it was added again while we were
1497            running with no res lock in ldlm_cancel_callback */
1498         ldlm_del_waiting_lock(lock);
1499         ldlm_resource_unlink_lock(lock);
1500         ldlm_lock_destroy_nolock(lock);
1501         unlock_res_and_lock(lock);
1502
1503         EXIT;
1504 }
1505
1506 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1507 {
1508         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1509         ENTRY;
1510
1511         if (lock == NULL)
1512                 RETURN(-EINVAL);
1513
1514         lock->l_ast_data = data;
1515         LDLM_LOCK_PUT(lock);
1516         RETURN(0);
1517 }
1518
1519 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1520 {
1521         struct ldlm_lock *lock;
1522         struct ldlm_resource *res;
1523
1524         spin_lock(&exp->exp_ldlm_data.led_lock);
1525         while(!list_empty(&exp->exp_ldlm_data.led_held_locks)) {
1526                 lock = list_entry(exp->exp_ldlm_data.led_held_locks.next,
1527                                   struct ldlm_lock, l_export_chain);
1528                 res = ldlm_resource_getref(lock->l_resource);
1529                 LDLM_LOCK_GET(lock);
1530                 spin_unlock(&exp->exp_ldlm_data.led_lock);
1531
1532                 LDLM_DEBUG(lock, "export %p", exp);
1533                 ldlm_lock_cancel(lock);
1534                 ldlm_reprocess_all(res);
1535
1536                 ldlm_resource_putref(res);
1537                 LDLM_LOCK_PUT(lock);
1538                 spin_lock(&exp->exp_ldlm_data.led_lock);
1539         }
1540         spin_unlock(&exp->exp_ldlm_data.led_lock);
1541 }
1542
1543 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1544                                         int *flags)
1545 {
1546         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1547         struct ldlm_resource *res;
1548         struct ldlm_namespace *ns;
1549         int granted = 0;
1550         int old_mode, rc;
1551         struct ldlm_lock *mark_lock = NULL;
1552         int join = LDLM_JOIN_NONE;
1553         ldlm_error_t err;
1554         ENTRY;
1555
1556         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1557                 *flags |= LDLM_FL_BLOCK_GRANTED;
1558                 RETURN(lock->l_resource);
1559         }
1560
1561         LASSERTF(new_mode == LCK_PW && lock->l_granted_mode == LCK_PR,
1562                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1563
1564         lock_res_and_lock(lock);
1565
1566         res = lock->l_resource;
1567         ns = res->lr_namespace;
1568
1569         old_mode = lock->l_req_mode;
1570         lock->l_req_mode = new_mode;
1571         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1572                 /* remember the lock position where the lock might be
1573                  * added back to the granted list later and also
1574                  * remember the join mode for skiplist fixing. */
1575                 if (LDLM_SL_HEAD(&lock->l_sl_mode))
1576                         join = LDLM_MODE_JOIN_RIGHT;
1577                 else if (LDLM_SL_TAIL(&lock->l_sl_mode))
1578                         join = LDLM_MODE_JOIN_LEFT;
1579                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
1580                         join |= LDLM_POLICY_JOIN_RIGHT;
1581                 else if (LDLM_SL_TAIL(&lock->l_sl_policy))
1582                         join |= LDLM_POLICY_JOIN_LEFT;
1583
1584                 LASSERT(!((join & LDLM_MODE_JOIN_RIGHT) &&
1585                           (join & LDLM_POLICY_JOIN_LEFT)));
1586                 LASSERT(!((join & LDLM_MODE_JOIN_LEFT) &&
1587                           (join & LDLM_POLICY_JOIN_RIGHT)));
1588
1589                 if ((join & LDLM_MODE_JOIN_LEFT) ||
1590                     (join & LDLM_POLICY_JOIN_LEFT))
1591                         mark_lock = list_entry(lock->l_res_link.prev,
1592                                                struct ldlm_lock, l_res_link);
1593                 else if (lock->l_res_link.next != &res->lr_granted)
1594                         mark_lock = list_entry(lock->l_res_link.next,
1595                                                struct ldlm_lock, l_res_link);
1596         }
1597         ldlm_resource_unlink_lock(lock);
1598
1599         /* If this is a local resource, put it on the appropriate list. */
1600         if (res->lr_namespace->ns_client) {
1601                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1602                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1603                 } else {
1604                         /* This should never happen, because of the way the
1605                          * server handles conversions. */
1606                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1607                                    *flags);
1608                         LBUG();
1609
1610                         ldlm_grant_lock(lock, &rpc_list);
1611                         granted = 1;
1612                         /* FIXME: completion handling not with ns_lock held ! */
1613                         if (lock->l_completion_ast)
1614                                 lock->l_completion_ast(lock, 0, NULL);
1615                 }
1616         } else {
1617                 int pflags = 0;
1618                 ldlm_processing_policy policy;
1619                 policy = ldlm_processing_policy_table[res->lr_type];
1620                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1621                 if (rc == LDLM_ITER_STOP) {
1622                         lock->l_req_mode = old_mode;
1623                         ldlm_granted_list_add_lock(lock, mark_lock, join);
1624                         res = NULL;
1625                 } else {
1626                         *flags |= LDLM_FL_BLOCK_GRANTED;
1627                         granted = 1;
1628                 }
1629         }
1630         unlock_res_and_lock(lock);
1631
1632         if (granted)
1633                 ldlm_run_cp_ast_work(&rpc_list);
1634         RETURN(res);
1635 }
1636
1637 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1638 {
1639         struct obd_device *obd = NULL;
1640
1641         if (!((libcfs_debug | D_ERROR) & level))
1642                 return;
1643
1644         if (!lock) {
1645                 CDEBUG(level, "  NULL LDLM lock\n");
1646                 return;
1647         }
1648
1649         CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1650                lock, lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1651                pos, lock->l_pid);
1652         if (lock->l_conn_export != NULL)
1653                 obd = lock->l_conn_export->exp_obd;
1654         if (lock->l_export && lock->l_export->exp_connection) {
1655                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1656                      libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1657                      lock->l_remote_handle.cookie);
1658         } else if (obd == NULL) {
1659                 CDEBUG(level, "  Node: local\n");
1660         } else {
1661                 struct obd_import *imp = obd->u.cli.cl_import;
1662                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1663                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1664                        lock->l_remote_handle.cookie);
1665         }
1666         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64"/"LPU64")\n",
1667                   lock->l_resource,
1668                   lock->l_resource->lr_name.name[0],
1669                   lock->l_resource->lr_name.name[1],
1670                   lock->l_resource->lr_name.name[2]);
1671         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1672                "write: %d flags: %#x\n", ldlm_lockname[lock->l_req_mode],
1673                ldlm_lockname[lock->l_granted_mode],
1674                atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1675                lock->l_flags);
1676         if (lock->l_resource->lr_type == LDLM_EXTENT)
1677                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1678                        " (req "LPU64"-"LPU64")\n",
1679                        lock->l_policy_data.l_extent.start,
1680                        lock->l_policy_data.l_extent.end,
1681                        lock->l_req_extent.start, lock->l_req_extent.end);
1682         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1683                 CDEBUG(level, "  Pid: %d Extent: "LPU64" -> "LPU64"\n",
1684                        lock->l_policy_data.l_flock.pid,
1685                        lock->l_policy_data.l_flock.start,
1686                        lock->l_policy_data.l_flock.end);
1687        else if (lock->l_resource->lr_type == LDLM_IBITS)
1688                 CDEBUG(level, "  Bits: "LPX64"\n",
1689                        lock->l_policy_data.l_inodebits.bits);
1690 }
1691
1692 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1693 {
1694         struct ldlm_lock *lock;
1695
1696         if (!((libcfs_debug | D_ERROR) & level))
1697                 return;
1698
1699         lock = ldlm_handle2lock(lockh);
1700         if (lock == NULL)
1701                 return;
1702
1703         ldlm_lock_dump(D_OTHER, lock, 0);
1704
1705         LDLM_LOCK_PUT(lock);
1706 }
1707
1708 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
1709                       struct libcfs_debug_msg_data *data, const char *fmt,
1710                       ...)
1711 {
1712         va_list args;
1713         cfs_debug_limit_state_t *cdls = data->msg_cdls;
1714
1715         va_start(args, fmt);
1716
1717         if (lock->l_resource == NULL) {
1718                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1719                                    data->msg_fn, data->msg_line, fmt, args,
1720                        " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1721                        "res: \?\? rrc=\?\? type: \?\?\? flags: %x remote: "
1722                        LPX64" expref: %d pid: %u\n", 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_flags, lock->l_remote_handle.cookie,
1728                        lock->l_export ?
1729                        atomic_read(&lock->l_export->exp_refcount) : -99,
1730                        lock->l_pid);
1731                 va_end(args);
1732                 return;
1733         }
1734
1735         switch (lock->l_resource->lr_type) {
1736         case LDLM_EXTENT:
1737                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1738                                    data->msg_fn, data->msg_line, fmt, args,
1739                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1740                        "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
1741                        "] (req "LPU64"->"LPU64") flags: %x remote: "LPX64
1742                        " expref: %d pid: %u\n",
1743                        lock->l_resource->lr_namespace->ns_name, lock,
1744                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1745                        lock->l_readers, lock->l_writers,
1746                        ldlm_lockname[lock->l_granted_mode],
1747                        ldlm_lockname[lock->l_req_mode],
1748                        lock->l_resource->lr_name.name[0],
1749                        lock->l_resource->lr_name.name[1],
1750                        atomic_read(&lock->l_resource->lr_refcount),
1751                        ldlm_typename[lock->l_resource->lr_type],
1752                        lock->l_policy_data.l_extent.start,
1753                        lock->l_policy_data.l_extent.end,
1754                        lock->l_req_extent.start, lock->l_req_extent.end,
1755                        lock->l_flags, lock->l_remote_handle.cookie,
1756                        lock->l_export ?
1757                        atomic_read(&lock->l_export->exp_refcount) : -99,
1758                        lock->l_pid);
1759                 break;
1760
1761         case LDLM_FLOCK:
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" rrc: %d type: %s pid: %d "
1766                        "["LPU64"->"LPU64"] flags: %x remote: "LPX64
1767                        " expref: %d pid: %u\n",
1768                        lock->l_resource->lr_namespace->ns_name, lock,
1769                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1770                        lock->l_readers, lock->l_writers,
1771                        ldlm_lockname[lock->l_granted_mode],
1772                        ldlm_lockname[lock->l_req_mode],
1773                        lock->l_resource->lr_name.name[0],
1774                        lock->l_resource->lr_name.name[1],
1775                        atomic_read(&lock->l_resource->lr_refcount),
1776                        ldlm_typename[lock->l_resource->lr_type],
1777                        lock->l_policy_data.l_flock.pid,
1778                        lock->l_policy_data.l_flock.start,
1779                        lock->l_policy_data.l_flock.end,
1780                        lock->l_flags, lock->l_remote_handle.cookie,
1781                        lock->l_export ?
1782                        atomic_read(&lock->l_export->exp_refcount) : -99,
1783                        lock->l_pid);
1784                 break;
1785
1786         case LDLM_IBITS:
1787                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1788                                    data->msg_fn, data->msg_line, fmt, args,
1789                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1790                        "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
1791                        "flags: %x remote: "LPX64" expref: %d "
1792                        "pid %u\n",
1793                        lock->l_resource->lr_namespace->ns_name,
1794                        lock, lock->l_handle.h_cookie,
1795                        atomic_read (&lock->l_refc),
1796                        lock->l_readers, lock->l_writers,
1797                        ldlm_lockname[lock->l_granted_mode],
1798                        ldlm_lockname[lock->l_req_mode],
1799                        lock->l_resource->lr_name.name[0],
1800                        lock->l_resource->lr_name.name[1],
1801                        lock->l_policy_data.l_inodebits.bits,
1802                        atomic_read(&lock->l_resource->lr_refcount),
1803                        ldlm_typename[lock->l_resource->lr_type],
1804                        lock->l_flags, lock->l_remote_handle.cookie,
1805                        lock->l_export ?
1806                        atomic_read(&lock->l_export->exp_refcount) : -99,
1807                        lock->l_pid);
1808                 break;
1809
1810         default:
1811                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1812                                    data->msg_fn, data->msg_line, fmt, args,
1813                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1814                        "res: "LPU64"/"LPU64" rrc: %d type: %s flags: %x "
1815                        "remote: "LPX64" expref: %d pid: %u\n",
1816                        lock->l_resource->lr_namespace->ns_name,
1817                        lock, lock->l_handle.h_cookie,
1818                        atomic_read (&lock->l_refc),
1819                        lock->l_readers, lock->l_writers,
1820                        ldlm_lockname[lock->l_granted_mode],
1821                        ldlm_lockname[lock->l_req_mode],
1822                        lock->l_resource->lr_name.name[0],
1823                        lock->l_resource->lr_name.name[1],
1824                        atomic_read(&lock->l_resource->lr_refcount),
1825                        ldlm_typename[lock->l_resource->lr_type],
1826                        lock->l_flags, lock->l_remote_handle.cookie,
1827                        lock->l_export ?
1828                        atomic_read(&lock->l_export->exp_refcount) : -99,
1829                        lock->l_pid);
1830                 break;
1831         }
1832         va_end(args);
1833 }
1834 EXPORT_SYMBOL(_ldlm_lock_debug);