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