lustre/ldlm/ldlm_lock.c

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