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         lock->l_resource = ldlm_resource_getref(resource);
 295
 296         atomic_set(&lock->l_refc, 2);
 297         CFS_INIT_LIST_HEAD(&lock->l_res_link);
 298         CFS_INIT_LIST_HEAD(&lock->l_lru);
 299         CFS_INIT_LIST_HEAD(&lock->l_export_chain);
 300         CFS_INIT_LIST_HEAD(&lock->l_pending_chain);
 301         CFS_INIT_LIST_HEAD(&lock->l_bl_ast);
 302         CFS_INIT_LIST_HEAD(&lock->l_cp_ast);
 303         cfs_waitq_init(&lock->l_waitq);
 304         lock->l_blocking_lock = NULL;
 305         lock->l_pidb = 0;
 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(newres);
 356         unlock_res(oldres);
 357         unlock_bitlock(lock);
 358
 359         /* ...and the flowers are still standing! */
 360         ldlm_resource_putref(oldres);
 361
 362         RETURN(0);
 363 }
 364
 365 /*
 366  *  HANDLES
 367  */
 368
 369 void ldlm_lock2handle(const struct ldlm_lock *lock, struct lustre_handle *lockh)
 370 {
 371         lockh->cookie = lock->l_handle.h_cookie;
 372 }
 373
 374 /* if flags: atomically get the lock and set the flags.
 375  *           Return NULL if flag already set
 376  */
 377
 378 struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
 379                                      int flags)
 380 {
 381         struct ldlm_namespace *ns;
 382         struct ldlm_lock *lock, *retval = NULL;
 383         ENTRY;
 384
 385         LASSERT(handle);
 386
 387         lock = class_handle2object(handle->cookie);
 388         if (lock == NULL)
 389                 RETURN(NULL);
 390
 391         LASSERT(lock->l_resource != NULL);
 392         ns = lock->l_resource->lr_namespace;
 393         LASSERT(ns != NULL);
 394
 395         lock_res_and_lock(lock);
 396
 397         /* It's unlikely but possible that someone marked the lock as
 398          * destroyed after we did handle2object on it */
 399         if (lock->l_destroyed) {
 400                 unlock_res_and_lock(lock);
 401                 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
 402                 LDLM_LOCK_PUT(lock);
 403                 GOTO(out, retval);
 404         }
 405
 406         if (flags && (lock->l_flags & flags)) {
 407                 unlock_res_and_lock(lock);
 408                 LDLM_LOCK_PUT(lock);
 409                 GOTO(out, retval);
 410         }
 411
 412         if (flags)
 413                 lock->l_flags |= flags;
 414
 415         unlock_res_and_lock(lock);
 416         retval = lock;
 417         EXIT;
 418  out:
 419         return retval;
 420 }
 421
 422 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *ns,
 423                                       const struct lustre_handle *handle)
 424 {
 425         struct ldlm_lock *retval = NULL;
 426         retval = __ldlm_handle2lock(handle, 0);
 427         return retval;
 428 }
 429
 430 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 431 {
 432         struct obd_export *exp = lock->l_export?:lock->l_conn_export;
 433         /* INODEBITS_INTEROP: If the other side does not support
 434          * inodebits, reply with a plain lock descriptor.
 435          */
 436         if ((lock->l_resource->lr_type == LDLM_IBITS) &&
 437             (exp && !(exp->exp_connect_flags & OBD_CONNECT_IBITS))) {
 438                 struct ldlm_resource res = *lock->l_resource;
 439
 440                 /* Make sure all the right bits are set in this lock we
 441                    are going to pass to client */
 442                 LASSERTF(lock->l_policy_data.l_inodebits.bits ==
 443                          (MDS_INODELOCK_LOOKUP|MDS_INODELOCK_UPDATE),
 444                          "Inappropriate inode lock bits during "
 445                          "conversion " LPU64 "\n",
 446                          lock->l_policy_data.l_inodebits.bits);
 447                 res.lr_type = LDLM_PLAIN;
 448                 ldlm_res2desc(&res, &desc->l_resource);
 449                 /* Convert "new" lock mode to something old client can
 450                    understand */
 451                 if ((lock->l_req_mode == LCK_CR) ||
 452                     (lock->l_req_mode == LCK_CW))
 453                         desc->l_req_mode = LCK_PR;
 454                 else
 455                         desc->l_req_mode = lock->l_req_mode;
 456                 if ((lock->l_granted_mode == LCK_CR) ||
 457                     (lock->l_granted_mode == LCK_CW)) {
 458                         desc->l_granted_mode = LCK_PR;
 459                 } else {
 460                         /* We never grant PW/EX locks to clients */
 461                         LASSERT((lock->l_granted_mode != LCK_PW) &&
 462                                 (lock->l_granted_mode != LCK_EX));
 463                         desc->l_granted_mode = lock->l_granted_mode;
 464                 }
 465
 466                 /* We do not copy policy here, because there is no
 467                    policy for plain locks */
 468         } else {
 469                 ldlm_res2desc(lock->l_resource, &desc->l_resource);
 470                 desc->l_req_mode = lock->l_req_mode;
 471                 desc->l_granted_mode = lock->l_granted_mode;
 472                 desc->l_policy_data = lock->l_policy_data;
 473         }
 474 }
 475
 476 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 477                            struct list_head *work_list)
 478 {
 479         if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
 480                 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
 481                 lock->l_flags |= LDLM_FL_AST_SENT;
 482                 /* If the enqueuing client said so, tell the AST recipient to
 483                  * discard dirty data, rather than writing back. */
 484                 if (new->l_flags & LDLM_AST_DISCARD_DATA)
 485                         lock->l_flags |= LDLM_FL_DISCARD_DATA;
 486                 LASSERT(list_empty(&lock->l_bl_ast));
 487                 list_add(&lock->l_bl_ast, work_list);
 488                 LDLM_LOCK_GET(lock);
 489                 LASSERT(lock->l_blocking_lock == NULL);
 490                 lock->l_blocking_lock = LDLM_LOCK_GET(new);
 491         }
 492 }
 493
 494 void ldlm_add_cp_work_item(struct ldlm_lock *lock, struct list_head *work_list)
 495 {
 496         if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
 497                 lock->l_flags |= LDLM_FL_CP_REQD;
 498                 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
 499                 LASSERT(list_empty(&lock->l_cp_ast));
 500                 list_add(&lock->l_cp_ast, work_list);
 501                 LDLM_LOCK_GET(lock);
 502         }
 503 }
 504
 505 /* must be called with lr_lock held */
 506 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 507                                 struct list_head *work_list)
 508 {
 509         ENTRY;
 510         check_res_locked(lock->l_resource);
 511         if (new)
 512                 ldlm_add_bl_work_item(lock, new, work_list);
 513         else
 514                 ldlm_add_cp_work_item(lock, work_list);
 515         EXIT;
 516 }
 517
 518 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
 519 {
 520         struct ldlm_lock *lock;
 521
 522         lock = ldlm_handle2lock(lockh);
 523         LASSERT(lock != NULL);
 524         ldlm_lock_addref_internal(lock, mode);
 525         LDLM_LOCK_PUT(lock);
 526 }
 527
 528 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 529 {
 530         ldlm_lock_remove_from_lru(lock);
 531         if (mode & (LCK_NL | LCK_CR | LCK_PR))
 532                 lock->l_readers++;
 533         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP))
 534                 lock->l_writers++;
 535         lock->l_last_used = cfs_time_current();
 536         LDLM_LOCK_GET(lock);
 537         LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
 538 }
 539
 540 /* only called for local locks */
 541 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
 542 {
 543         lock_res_and_lock(lock);
 544         ldlm_lock_addref_internal_nolock(lock, mode);
 545         unlock_res_and_lock(lock);
 546 }
 547
 548 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
 549 {
 550         struct ldlm_namespace *ns;
 551         ENTRY;
 552
 553         lock_res_and_lock(lock);
 554
 555         ns = lock->l_resource->lr_namespace;
 556
 557         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 558         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 559                 LASSERT(lock->l_readers > 0);
 560                 lock->l_readers--;
 561         }
 562         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP)) {
 563                 LASSERT(lock->l_writers > 0);
 564                 lock->l_writers--;
 565         }
 566
 567         if (lock->l_flags & LDLM_FL_LOCAL &&
 568             !lock->l_readers && !lock->l_writers) {
 569                 /* If this is a local lock on a server namespace and this was
 570                  * the last reference, cancel the lock. */
 571                 CDEBUG(D_INFO, "forcing cancel of local lock\n");
 572                 lock->l_flags |= LDLM_FL_CBPENDING;
 573         }
 574
 575         if (!lock->l_readers && !lock->l_writers &&
 576             (lock->l_flags & LDLM_FL_CBPENDING)) {
 577                 /* If we received a blocked AST and this was the last reference,
 578                  * run the callback. */
 579                 if (ns->ns_client == LDLM_NAMESPACE_SERVER && lock->l_export)
 580                         CERROR("FL_CBPENDING set on non-local lock--just a "
 581                                "warning\n");
 582
 583                 LDLM_DEBUG(lock, "final decref done on cbpending lock");
 584
 585                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 586                 ldlm_lock_remove_from_lru(lock);
 587                 unlock_res_and_lock(lock);
 588                 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
 589                                 ldlm_bl_to_thread(ns, NULL, lock, 0) != 0)
 590                         ldlm_handle_bl_callback(ns, NULL, lock);
 591         } else if (ns->ns_client == LDLM_NAMESPACE_CLIENT &&
 592                    !lock->l_readers && !lock->l_writers &&
 593                    !(lock->l_flags & LDLM_FL_NO_LRU)) {
 594                 /* If this is a client-side namespace and this was the last
 595                  * reference, put it on the LRU. */
 596                 LASSERT(list_empty(&lock->l_lru));
 597                 LASSERT(ns->ns_nr_unused >= 0);
 598                 lock->l_last_used = cfs_time_current();
 599                 spin_lock(&ns->ns_unused_lock);
 600                 list_add_tail(&lock->l_lru, &ns->ns_unused_list);
 601                 ns->ns_nr_unused++;
 602                 spin_unlock(&ns->ns_unused_lock);
 603                 unlock_res_and_lock(lock);
 604                 /* Call ldlm_cancel_lru() only if EARLY_CANCEL is not supported
 605                  * by the server, otherwise, it is done on enqueue. */
 606                 if (!exp_connect_cancelset(lock->l_conn_export))
 607                         ldlm_cancel_lru(ns, LDLM_ASYNC);
 608         } else {
 609                 unlock_res_and_lock(lock);
 610         }
 611
 612         LDLM_LOCK_PUT(lock);    /* matches the ldlm_lock_get in addref */
 613
 614         EXIT;
 615 }
 616
 617 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
 618 {
 619         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 620         LASSERTF(lock != NULL, "Non-existing lock: "LPX64"\n", lockh->cookie);
 621         ldlm_lock_decref_internal(lock, mode);
 622         LDLM_LOCK_PUT(lock);
 623 }
 624
 625 /* This will drop a lock reference and mark it for destruction, but will not
 626  * necessarily cancel the lock before returning. */
 627 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
 628 {
 629         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 630         ENTRY;
 631
 632         LASSERT(lock != NULL);
 633
 634         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 635         lock_res_and_lock(lock);
 636         lock->l_flags |= LDLM_FL_CBPENDING;
 637         unlock_res_and_lock(lock);
 638         ldlm_lock_decref_internal(lock, mode);
 639         LDLM_LOCK_PUT(lock);
 640 }
 641
 642 /*
 643  * search_granted_lock
 644  *
 645  * Description:
 646  *      Finds a position to insert the new lock.
 647  * Parameters:
 648  *      queue [input]:  the granted list where search acts on;
 649  *      req [input]:    the lock whose position to be located;
 650  *      lockp [output]: the position where the lock should be inserted before, or
 651  *                      NULL indicating @req should be appended to @queue.
 652  * Return Values:
 653  *      Bit-masks combination of following values indicating in which way the
 654  *      lock need to be inserted.
 655  *      - LDLM_JOIN_NONE:       noting about skip list needs to be fixed;
 656  *      - LDLM_MODE_JOIN_RIGHT: @req needs join right becoming the head of a
 657  *                              mode group;
 658  *      - LDLM_POLICY_JOIN_RIGHT: @req needs join right becoming the head of
 659  *                                a policy group.
 660  * NOTE: called by
 661  *  - ldlm_grant_lock_with_skiplist
 662  */
 663 static int search_granted_lock(struct list_head *queue,
 664                         struct ldlm_lock *req,
 665                         struct ldlm_lock **lockp)
 666 {
 667         struct list_head *tmp, *tmp_tail;
 668         struct ldlm_lock *lock, *mode_head_lock;
 669         int rc = LDLM_JOIN_NONE;
 670         ENTRY;
 671
 672         list_for_each(tmp, queue) {
 673                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 674
 675                 if (lock->l_req_mode != req->l_req_mode) {
 676                         if (LDLM_SL_HEAD(&lock->l_sl_mode))
 677                                 tmp = &list_entry(lock->l_sl_mode.next,
 678                                                   struct ldlm_lock,
 679                                                   l_sl_mode)->l_res_link;
 680                         continue;
 681                 }
 682
 683                 /* found the same mode group */
 684                 if (lock->l_resource->lr_type == LDLM_PLAIN) {
 685                         *lockp = lock;
 686                         rc = LDLM_MODE_JOIN_RIGHT;
 687                         GOTO(out, rc);
 688                 } else if (lock->l_resource->lr_type == LDLM_IBITS) {
 689                         tmp_tail = tmp;
 690                         if (LDLM_SL_HEAD(&lock->l_sl_mode))
 691                                 tmp_tail = &list_entry(lock->l_sl_mode.next,
 692                                                        struct ldlm_lock,
 693                                                        l_sl_mode)->l_res_link;
 694                         mode_head_lock = lock;
 695                         for (;;) {
 696                                 if (lock->l_policy_data.l_inodebits.bits ==
 697                                     req->l_policy_data.l_inodebits.bits) {
 698                                         /* matched policy lock is found */
 699                                         *lockp = lock;
 700                                         rc |= LDLM_POLICY_JOIN_RIGHT;
 701
 702                                         /* if the policy group head is also a
 703                                          * mode group head or a single mode
 704                                          * group lock */
 705                                         if (LDLM_SL_HEAD(&lock->l_sl_mode) ||
 706                                             (tmp == tmp_tail &&
 707                                              LDLM_SL_EMPTY(&lock->l_sl_mode)))
 708                                                 rc |= LDLM_MODE_JOIN_RIGHT;
 709                                         GOTO(out, rc);
 710                                 }
 711
 712                                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
 713                                         tmp = &list_entry(lock->l_sl_policy.next,
 714                                                           struct ldlm_lock,
 715                                                           l_sl_policy)->l_res_link;
 716
 717                                 if (tmp == tmp_tail)
 718                                         break;
 719                                 else
 720                                         tmp = tmp->next;
 721                                 lock = list_entry(tmp, struct ldlm_lock,
 722                                                   l_res_link);
 723                         }  /* for all locks in the matched mode group */
 724
 725                         /* no matched policy group is found, insert before
 726                          * the mode group head lock */
 727                         *lockp = mode_head_lock;
 728                         rc = LDLM_MODE_JOIN_RIGHT;
 729                         GOTO(out, rc);
 730                 } else {
 731                         LDLM_ERROR(lock, "is not LDLM_PLAIN or LDLM_IBITS lock");
 732                         LBUG();
 733                 }
 734         }
 735
 736         /* no matched mode group is found, append to the end */
 737         *lockp = NULL;
 738         rc = LDLM_JOIN_NONE;
 739         EXIT;
 740 out:
 741         return rc;
 742 }
 743
 744 static void ldlm_granted_list_add_lock(struct ldlm_lock *lock,
 745                                        struct ldlm_lock *lockp,
 746                                        int join)
 747 {
 748         struct ldlm_resource *res = lock->l_resource;
 749         ENTRY;
 750
 751         LASSERT(lockp || join == LDLM_JOIN_NONE);
 752
 753         check_res_locked(res);
 754
 755         ldlm_resource_dump(D_OTHER, res);
 756         CDEBUG(D_OTHER, "About to add this lock:\n");
 757         ldlm_lock_dump(D_OTHER, lock, 0);
 758
 759         if (lock->l_destroyed) {
 760                 CDEBUG(D_OTHER, "Lock destroyed, not adding to resource\n");
 761                 return;
 762         }
 763
 764         LASSERT(list_empty(&lock->l_res_link));
 765
 766         if (!lockp)
 767                 list_add_tail(&lock->l_res_link, &lock->l_resource->lr_granted);
 768         else if ((join & LDLM_MODE_JOIN_LEFT) || (join & LDLM_POLICY_JOIN_LEFT))
 769                 list_add(&lock->l_res_link, &lockp->l_res_link);
 770         else
 771                 list_add_tail(&lock->l_res_link, &lockp->l_res_link);
 772
 773         /* fix skip lists */
 774         if (join & LDLM_MODE_JOIN_RIGHT) {
 775                 LASSERT(! LDLM_SL_TAIL(&lockp->l_sl_mode));
 776                 if (LDLM_SL_EMPTY(&lockp->l_sl_mode)) {
 777                         lock->l_sl_mode.next = &lockp->l_sl_mode;
 778                         lockp->l_sl_mode.prev = &lock->l_sl_mode;
 779                 } else if (LDLM_SL_HEAD(&lockp->l_sl_mode)) {
 780                         lock->l_sl_mode.next = lockp->l_sl_mode.next;
 781                         lockp->l_sl_mode.next = NULL;
 782                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
 783                 }
 784         } else if (join & LDLM_MODE_JOIN_LEFT) {
 785                 LASSERT(! LDLM_SL_HEAD(&lockp->l_sl_mode));
 786                if (LDLM_SL_EMPTY(&lockp->l_sl_mode)) {
 787                         lock->l_sl_mode.prev = &lockp->l_sl_mode;
 788                         lockp->l_sl_mode.next = &lock->l_sl_mode;
 789                 } else if (LDLM_SL_TAIL(&lockp->l_sl_mode)) {
 790                         lock->l_sl_mode.prev = lockp->l_sl_mode.prev;
 791                         lockp->l_sl_mode.prev = NULL;
 792                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
 793                 }
 794         }
 795
 796         if (join & LDLM_POLICY_JOIN_RIGHT) {
 797                 LASSERT(! LDLM_SL_TAIL(&lockp->l_sl_policy));
 798                 if (LDLM_SL_EMPTY(&lockp->l_sl_policy)) {
 799                         lock->l_sl_policy.next = &lockp->l_sl_policy;
 800                         lockp->l_sl_policy.prev = &lock->l_sl_policy;
 801                 } else if (LDLM_SL_HEAD(&lockp->l_sl_policy)) {
 802                         lock->l_sl_policy.next = lockp->l_sl_policy.next;
 803                         lockp->l_sl_policy.next = NULL;
 804                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
 805                 }
 806         } else if (join & LDLM_POLICY_JOIN_LEFT) {
 807                 LASSERT(! LDLM_SL_HEAD(&lockp->l_sl_policy));
 808                 if (LDLM_SL_EMPTY(&lockp->l_sl_policy)) {
 809                         lock->l_sl_policy.prev = &lockp->l_sl_policy;
 810                         lockp->l_sl_policy.next = &lock->l_sl_policy;
 811                 } else if (LDLM_SL_TAIL(&lockp->l_sl_policy)) {
 812                         lock->l_sl_policy.prev = lockp->l_sl_policy.prev;
 813                         lockp->l_sl_policy.prev = NULL;
 814                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
 815                 }
 816         }
 817
 818         EXIT;
 819 }
 820
 821 static void ldlm_grant_lock_with_skiplist(struct ldlm_lock *lock)
 822 {
 823         int join = LDLM_JOIN_NONE;
 824         struct ldlm_lock *lockp = NULL;
 825         ENTRY;
 826
 827         LASSERT(lock->l_req_mode == lock->l_granted_mode);
 828
 829         join = search_granted_lock(&lock->l_resource->lr_granted, lock, &lockp);
 830         ldlm_granted_list_add_lock(lock, lockp, join);
 831         EXIT;
 832 }
 833
 834 /* NOTE: called by
 835  *  - ldlm_lock_enqueue
 836  *  - ldlm_reprocess_queue
 837  *  - ldlm_lock_convert
 838  *
 839  * must be called with lr_lock held
 840  */
 841 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
 842 {
 843         struct ldlm_resource *res = lock->l_resource;
 844         ENTRY;
 845
 846         check_res_locked(res);
 847
 848         lock->l_granted_mode = lock->l_req_mode;
 849         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS)
 850                 ldlm_grant_lock_with_skiplist(lock);
 851         else
 852                 ldlm_resource_add_lock(res, &res->lr_granted, lock);
 853
 854         if (lock->l_granted_mode < res->lr_most_restr)
 855                 res->lr_most_restr = lock->l_granted_mode;
 856
 857         if (work_list && lock->l_completion_ast != NULL)
 858                 ldlm_add_ast_work_item(lock, NULL, work_list);
 859
 860         EXIT;
 861 }
 862
 863 /* returns a referenced lock or NULL.  See the flag descriptions below, in the
 864  * comment above ldlm_lock_match */
 865 static struct ldlm_lock *search_queue(struct list_head *queue, ldlm_mode_t mode,
 866                                       ldlm_policy_data_t *policy,
 867                                       struct ldlm_lock *old_lock, int flags)
 868 {
 869         struct ldlm_lock *lock;
 870         struct list_head *tmp;
 871
 872         list_for_each(tmp, queue) {
 873                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 874
 875                 if (lock == old_lock)
 876                         break;
 877
 878                 /* llite sometimes wants to match locks that will be
 879                  * canceled when their users drop, but we allow it to match
 880                  * if it passes in CBPENDING and the lock still has users.
 881                  * this is generally only going to be used by children
 882                  * whose parents already hold a lock so forward progress
 883                  * can still happen. */
 884                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 885                     !(flags & LDLM_FL_CBPENDING))
 886                         continue;
 887                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 888                     lock->l_readers == 0 && lock->l_writers == 0)
 889                         continue;
 890
 891                 if (!(lock->l_req_mode & mode))
 892                         continue;
 893
 894                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 895                     (lock->l_policy_data.l_extent.start >
 896                      policy->l_extent.start ||
 897                      lock->l_policy_data.l_extent.end < policy->l_extent.end))
 898                         continue;
 899
 900                 if (unlikely(mode == LCK_GROUP) &&
 901                     lock->l_resource->lr_type == LDLM_EXTENT &&
 902                     lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
 903                         continue;
 904
 905                 /* We match if we have existing lock with same or wider set
 906                    of bits. */
 907                 if (lock->l_resource->lr_type == LDLM_IBITS &&
 908                      ((lock->l_policy_data.l_inodebits.bits &
 909                       policy->l_inodebits.bits) !=
 910                       policy->l_inodebits.bits))
 911                         continue;
 912
 913                 if (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED))
 914                         continue;
 915
 916                 if ((flags & LDLM_FL_LOCAL_ONLY) &&
 917                     !(lock->l_flags & LDLM_FL_LOCAL))
 918                         continue;
 919
 920                 if (flags & LDLM_FL_TEST_LOCK)
 921                         LDLM_LOCK_GET(lock);
 922                 else
 923                         ldlm_lock_addref_internal_nolock(lock, mode);
 924                 return lock;
 925         }
 926
 927         return NULL;
 928 }
 929
 930 void ldlm_lock_allow_match(struct ldlm_lock *lock)
 931 {
 932         lock_res_and_lock(lock);
 933         lock->l_flags |= LDLM_FL_LVB_READY;
 934         cfs_waitq_signal(&lock->l_waitq);
 935         unlock_res_and_lock(lock);
 936 }
 937
 938 /* Can be called in two ways:
 939  *
 940  * If 'ns' is NULL, then lockh describes an existing lock that we want to look
 941  * for a duplicate of.
 942  *
 943  * Otherwise, all of the fields must be filled in, to match against.
 944  *
 945  * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
 946  *     server (ie, connh is NULL)
 947  * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
 948  *     list will be considered
 949  * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
 950  *     to be canceled can still be matched as long as they still have reader
 951  *     or writer refernces
 952  * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
 953  *     just tell us if we would have matched.
 954  *
 955  * Returns 1 if it finds an already-existing lock that is compatible; in this
 956  * case, lockh is filled in with a addref()ed lock
 957  *
 958  * we also check security context, if that failed we simply return 0 (to keep
 959  * caller code unchanged), the context failure will be discovered by caller
 960  * sometime later.
 961  */
 962 int ldlm_lock_match(struct ldlm_namespace *ns, int flags,
 963                     const struct ldlm_res_id *res_id, ldlm_type_t type,
 964                     ldlm_policy_data_t *policy, ldlm_mode_t mode,
 965                     struct lustre_handle *lockh)
 966 {
 967         struct ldlm_resource *res;
 968         struct ldlm_lock *lock, *old_lock = NULL;
 969         int rc = 0;
 970         ENTRY;
 971
 972         if (ns == NULL) {
 973                 old_lock = ldlm_handle2lock(lockh);
 974                 LASSERT(old_lock);
 975
 976                 ns = old_lock->l_resource->lr_namespace;
 977                 res_id = &old_lock->l_resource->lr_name;
 978                 type = old_lock->l_resource->lr_type;
 979                 mode = old_lock->l_req_mode;
 980         }
 981
 982         res = ldlm_resource_get(ns, NULL, res_id, type, 0);
 983         if (res == NULL) {
 984                 LASSERT(old_lock == NULL);
 985                 RETURN(0);
 986         }
 987
 988         lock_res(res);
 989
 990         lock = search_queue(&res->lr_granted, mode, policy, old_lock, flags);
 991         if (lock != NULL)
 992                 GOTO(out, rc = 1);
 993         if (flags & LDLM_FL_BLOCK_GRANTED)
 994                 GOTO(out, rc = 0);
 995         lock = search_queue(&res->lr_converting, mode, policy, old_lock, flags);
 996         if (lock != NULL)
 997                 GOTO(out, rc = 1);
 998         lock = search_queue(&res->lr_waiting, mode, policy, old_lock, flags);
 999         if (lock != NULL)
1000                 GOTO(out, rc = 1);
1001
1002         EXIT;
1003  out:
1004         unlock_res(res);
1005         ldlm_resource_putref(res);
1006
1007         if (lock) {
1008                 ldlm_lock2handle(lock, lockh);
1009                 if ((flags & LDLM_FL_LVB_READY) &&
1010                     (!(lock->l_flags & LDLM_FL_LVB_READY))) {
1011                         struct l_wait_info lwi;
1012                         if (lock->l_completion_ast) {
1013                                 int err = lock->l_completion_ast(lock,
1014                                                           LDLM_FL_WAIT_NOREPROC,
1015                                                                  NULL);
1016                                 if (err) {
1017                                         if (flags & LDLM_FL_TEST_LOCK)
1018                                                 LDLM_LOCK_PUT(lock);
1019                                         else
1020                                                 ldlm_lock_decref_internal(lock, mode);
1021                                         rc = 0;
1022                                         goto out2;
1023                                 }
1024                         }
1025
1026                         lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(obd_timeout), NULL,
1027                                                LWI_ON_SIGNAL_NOOP, NULL);
1028
1029                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
1030                         l_wait_event(lock->l_waitq,
1031                                      (lock->l_flags & LDLM_FL_LVB_READY), &lwi);
1032                 }
1033         }
1034  out2:
1035         if (rc) {
1036                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
1037                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1038                                 res_id->name[2] : policy->l_extent.start,
1039                            (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1040                                 res_id->name[3] : policy->l_extent.end);
1041
1042                 /* check user's security context */
1043                 if (lock->l_conn_export &&
1044                     sptlrpc_import_check_ctx(
1045                                 class_exp2cliimp(lock->l_conn_export))) {
1046                         if (!(flags & LDLM_FL_TEST_LOCK))
1047                                 ldlm_lock_decref_internal(lock, mode);
1048                         rc = 0;
1049                 }
1050
1051                 if (flags & LDLM_FL_TEST_LOCK)
1052                         LDLM_LOCK_PUT(lock);
1053
1054         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/*less verbose for test-only*/
1055                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
1056                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
1057                                   type, mode, res_id->name[0], res_id->name[1],
1058                                   (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1059                                         res_id->name[2] :policy->l_extent.start,
1060                                 (type == LDLM_PLAIN || type == LDLM_IBITS) ?
1061                                         res_id->name[3] : policy->l_extent.end);
1062         }
1063         if (old_lock)
1064                 LDLM_LOCK_PUT(old_lock);
1065
1066         return rc;
1067 }
1068
1069 /* Returns a referenced lock */
1070 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
1071                                    const struct ldlm_res_id *res_id,
1072                                    ldlm_type_t type,
1073                                    ldlm_mode_t mode,
1074                                    ldlm_blocking_callback blocking,
1075                                    ldlm_completion_callback completion,
1076                                    ldlm_glimpse_callback glimpse,
1077                                    void *data, __u32 lvb_len)
1078 {
1079         struct ldlm_lock *lock;
1080         struct ldlm_resource *res;
1081         ENTRY;
1082
1083         res = ldlm_resource_get(ns, NULL, res_id, type, 1);
1084         if (res == NULL)
1085                 RETURN(NULL);
1086
1087         lock = ldlm_lock_new(res);
1088         ldlm_resource_putref(res);
1089
1090         if (lock == NULL)
1091                 RETURN(NULL);
1092
1093         lock->l_req_mode = mode;
1094         lock->l_ast_data = data;
1095         lock->l_blocking_ast = blocking;
1096         lock->l_completion_ast = completion;
1097         lock->l_glimpse_ast = glimpse;
1098         lock->l_pid = cfs_curproc_pid();
1099
1100         if (lvb_len) {
1101                 lock->l_lvb_len = lvb_len;
1102                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
1103                 if (lock->l_lvb_data == NULL) {
1104                         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
1105                         RETURN(NULL);
1106                 }
1107         }
1108
1109         RETURN(lock);
1110 }
1111
1112 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
1113                                struct ldlm_lock **lockp,
1114                                void *cookie, int *flags)
1115 {
1116         struct ldlm_lock *lock = *lockp;
1117         struct ldlm_resource *res = lock->l_resource;
1118         int local = res->lr_namespace->ns_client;
1119         ldlm_processing_policy policy;
1120         ldlm_error_t rc = ELDLM_OK;
1121         ENTRY;
1122
1123         do_gettimeofday(&lock->l_enqueued_time);
1124         /* policies are not executed on the client or during replay */
1125         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
1126             && !local && ns->ns_policy) {
1127                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
1128                                    NULL);
1129                 if (rc == ELDLM_LOCK_REPLACED) {
1130                         /* The lock that was returned has already been granted,
1131                          * and placed into lockp.  If it's not the same as the
1132                          * one we passed in, then destroy the old one and our
1133                          * work here is done. */
1134                         if (lock != *lockp) {
1135                                 ldlm_lock_destroy(lock);
1136                                 LDLM_LOCK_PUT(lock);
1137                         }
1138                         *flags |= LDLM_FL_LOCK_CHANGED;
1139                         RETURN(0);
1140                 } else if (rc != ELDLM_OK ||
1141                            (rc == ELDLM_OK && (*flags & LDLM_FL_INTENT_ONLY))) {
1142                         ldlm_lock_destroy(lock);
1143                         RETURN(rc);
1144                 }
1145         }
1146
1147         lock_res_and_lock(lock);
1148         if (local && lock->l_req_mode == lock->l_granted_mode) {
1149                 /* The server returned a blocked lock, but it was granted before
1150                  * we got a chance to actually enqueue it.  We don't need to do
1151                  * anything else. */
1152                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
1153                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
1154                 GOTO(out, ELDLM_OK);
1155         }
1156
1157         /* Some flags from the enqueue want to make it into the AST, via the
1158          * lock's l_flags. */
1159         lock->l_flags |= *flags & LDLM_AST_DISCARD_DATA;
1160
1161         /* This distinction between local lock trees is very important; a client
1162          * namespace only has information about locks taken by that client, and
1163          * thus doesn't have enough information to decide for itself if it can
1164          * be granted (below).  In this case, we do exactly what the server
1165          * tells us to do, as dictated by the 'flags'.
1166          *
1167          * We do exactly the same thing during recovery, when the server is
1168          * more or less trusting the clients not to lie.
1169          *
1170          * FIXME (bug 268): Detect obvious lies by checking compatibility in
1171          * granted/converting queues. */
1172         ldlm_resource_unlink_lock(lock);
1173         if (local) {
1174                 if (*flags & LDLM_FL_BLOCK_CONV)
1175                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1176                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
1177                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1178                 else
1179                         ldlm_grant_lock(lock, NULL);
1180                 GOTO(out, ELDLM_OK);
1181         } else if (*flags & LDLM_FL_REPLAY) {
1182                 if (*flags & LDLM_FL_BLOCK_CONV) {
1183                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1184                         GOTO(out, ELDLM_OK);
1185                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
1186                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
1187                         GOTO(out, ELDLM_OK);
1188                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
1189                         ldlm_grant_lock(lock, NULL);
1190                         GOTO(out, ELDLM_OK);
1191                 }
1192                 /* If no flags, fall through to normal enqueue path. */
1193         }
1194
1195         policy = ldlm_processing_policy_table[res->lr_type];
1196         policy(lock, flags, 1, &rc, NULL);
1197         GOTO(out, rc);
1198 out:
1199         unlock_res_and_lock(lock);
1200         return rc;
1201 }
1202
1203 /* Must be called with namespace taken: queue is waiting or converting. */
1204 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
1205                          struct list_head *work_list)
1206 {
1207         struct list_head *tmp, *pos;
1208         ldlm_processing_policy policy;
1209         int flags;
1210         int rc = LDLM_ITER_CONTINUE;
1211         ldlm_error_t err;
1212         ENTRY;
1213
1214         check_res_locked(res);
1215
1216         policy = ldlm_processing_policy_table[res->lr_type];
1217         LASSERT(policy);
1218
1219         list_for_each_safe(tmp, pos, queue) {
1220                 struct ldlm_lock *pending;
1221                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
1222
1223                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
1224
1225                 flags = 0;
1226                 rc = policy(pending, &flags, 0, &err, work_list);
1227                 if (rc != LDLM_ITER_CONTINUE)
1228                         break;
1229         }
1230
1231         RETURN(rc);
1232 }
1233
1234 int ldlm_run_bl_ast_work(struct list_head *rpc_list)
1235 {
1236         struct list_head *tmp, *pos;
1237         struct ldlm_lock_desc d;
1238         int rc = 0, retval = 0;
1239         ENTRY;
1240
1241         list_for_each_safe(tmp, pos, rpc_list) {
1242                 struct ldlm_lock *lock =
1243                         list_entry(tmp, struct ldlm_lock, l_bl_ast);
1244
1245                 /* nobody should touch l_bl_ast */
1246                 lock_res_and_lock(lock);
1247                 list_del_init(&lock->l_bl_ast);
1248
1249                 LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
1250                 LASSERT(lock->l_bl_ast_run == 0);
1251                 LASSERT(lock->l_blocking_lock);
1252                 lock->l_bl_ast_run++;
1253                 unlock_res_and_lock(lock);
1254
1255                 ldlm_lock2desc(lock->l_blocking_lock, &d);
1256
1257                 LDLM_LOCK_PUT(lock->l_blocking_lock);
1258                 lock->l_blocking_lock = NULL;
1259                 rc = lock->l_blocking_ast(lock, &d, NULL, LDLM_CB_BLOCKING);
1260
1261                 if (rc == -ERESTART)
1262                         retval = rc;
1263                 else if (rc)
1264                         CDEBUG(D_DLMTRACE, "Failed AST - should clean & "
1265                                "disconnect client\n");
1266                 LDLM_LOCK_PUT(lock);
1267         }
1268         RETURN(retval);
1269 }
1270
1271 int ldlm_run_cp_ast_work(struct list_head *rpc_list)
1272 {
1273         struct list_head *tmp, *pos;
1274         int rc = 0, retval = 0;
1275         ENTRY;
1276
1277         /* It's possible to receive a completion AST before we've set
1278          * the l_completion_ast pointer: either because the AST arrived
1279          * before the reply, or simply because there's a small race
1280          * window between receiving the reply and finishing the local
1281          * enqueue. (bug 842)
1282          *
1283          * This can't happen with the blocking_ast, however, because we
1284          * will never call the local blocking_ast until we drop our
1285          * reader/writer reference, which we won't do until we get the
1286          * reply and finish enqueueing. */
1287
1288         list_for_each_safe(tmp, pos, rpc_list) {
1289                 struct ldlm_lock *lock =
1290                         list_entry(tmp, struct ldlm_lock, l_cp_ast);
1291
1292                 /* nobody should touch l_cp_ast */
1293                 lock_res_and_lock(lock);
1294                 list_del_init(&lock->l_cp_ast);
1295                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1296                 lock->l_flags &= ~LDLM_FL_CP_REQD;
1297                 unlock_res_and_lock(lock);
1298
1299                 if (lock->l_completion_ast != NULL)
1300                         rc = lock->l_completion_ast(lock, 0, 0);
1301                 if (rc == -ERESTART)
1302                         retval = rc;
1303                 else if (rc)
1304                         CDEBUG(D_DLMTRACE, "Failed AST - should clean & "
1305                                "disconnect client\n");
1306                 LDLM_LOCK_PUT(lock);
1307         }
1308         RETURN(retval);
1309 }
1310
1311 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1312 {
1313         ldlm_reprocess_all(res);
1314         return LDLM_ITER_CONTINUE;
1315 }
1316
1317 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1318 {
1319         struct list_head *tmp;
1320         int i, rc;
1321
1322         if (ns == NULL)
1323                 return;
1324
1325         ENTRY;
1326         spin_lock(&ns->ns_hash_lock);
1327         for (i = 0; i < RES_HASH_SIZE; i++) {
1328                 tmp = ns->ns_hash[i].next;
1329                 while (tmp != &(ns->ns_hash[i])) {
1330                         struct ldlm_resource *res =
1331                                 list_entry(tmp, struct ldlm_resource, lr_hash);
1332
1333                         ldlm_resource_getref(res);
1334                         spin_unlock(&ns->ns_hash_lock);
1335
1336                         rc = reprocess_one_queue(res, NULL);
1337
1338                         spin_lock(&ns->ns_hash_lock);
1339                         tmp = tmp->next;
1340                         ldlm_resource_putref_locked(res);
1341
1342                         if (rc == LDLM_ITER_STOP)
1343                                 GOTO(out, rc);
1344                 }
1345         }
1346  out:
1347         spin_unlock(&ns->ns_hash_lock);
1348         EXIT;
1349 }
1350
1351 void ldlm_reprocess_all(struct ldlm_resource *res)
1352 {
1353         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1354         int rc;
1355         ENTRY;
1356
1357         /* Local lock trees don't get reprocessed. */
1358         if (res->lr_namespace->ns_client) {
1359                 EXIT;
1360                 return;
1361         }
1362
1363  restart:
1364         lock_res(res);
1365         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1366         if (rc == LDLM_ITER_CONTINUE)
1367                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1368         unlock_res(res);
1369
1370         rc = ldlm_run_cp_ast_work(&rpc_list);
1371         if (rc == -ERESTART) {
1372                 LASSERT(list_empty(&rpc_list));
1373                 goto restart;
1374         }
1375         EXIT;
1376 }
1377
1378 void ldlm_cancel_callback(struct ldlm_lock *lock)
1379 {
1380         check_res_locked(lock->l_resource);
1381         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1382                 lock->l_flags |= LDLM_FL_CANCEL;
1383                 if (lock->l_blocking_ast) {
1384                         // l_check_no_ns_lock(ns);
1385                         unlock_res_and_lock(lock);
1386                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1387                                              LDLM_CB_CANCELING);
1388                         lock_res_and_lock(lock);
1389                 } else {
1390                         LDLM_DEBUG(lock, "no blocking ast");
1391                 }
1392         }
1393 }
1394
1395 void ldlm_unlink_lock_skiplist(struct ldlm_lock *req)
1396 {
1397         struct ldlm_lock *lock;
1398
1399         if (req->l_resource->lr_type != LDLM_PLAIN &&
1400             req->l_resource->lr_type != LDLM_IBITS)
1401                 return;
1402
1403         if (LDLM_SL_HEAD(&req->l_sl_mode)) {
1404                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1405                                   l_res_link);
1406                 if (req->l_sl_mode.next == &lock->l_sl_mode) {
1407                         lock->l_sl_mode.prev = NULL;
1408                 } else {
1409                         lock->l_sl_mode.next = req->l_sl_mode.next;
1410                         lock->l_sl_mode.next->prev = &lock->l_sl_mode;
1411                 }
1412                 req->l_sl_mode.next = NULL;
1413         } else if (LDLM_SL_TAIL(&req->l_sl_mode)) {
1414                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1415                                   l_res_link);
1416                 if (req->l_sl_mode.prev == &lock->l_sl_mode) {
1417                         lock->l_sl_mode.next = NULL;
1418                 } else {
1419                         lock->l_sl_mode.prev = req->l_sl_mode.prev;
1420                         lock->l_sl_mode.prev->next = &lock->l_sl_mode;
1421                 }
1422                 req->l_sl_mode.prev = NULL;
1423         }
1424
1425         if (LDLM_SL_HEAD(&req->l_sl_policy)) {
1426                 lock = list_entry(req->l_res_link.next, struct ldlm_lock,
1427                                   l_res_link);
1428                 if (req->l_sl_policy.next == &lock->l_sl_policy) {
1429                         lock->l_sl_policy.prev = NULL;
1430                 } else {
1431                         lock->l_sl_policy.next = req->l_sl_policy.next;
1432                         lock->l_sl_policy.next->prev = &lock->l_sl_policy;
1433                 }
1434                 req->l_sl_policy.next = NULL;
1435         } else if (LDLM_SL_TAIL(&req->l_sl_policy)) {
1436                 lock = list_entry(req->l_res_link.prev, struct ldlm_lock,
1437                                   l_res_link);
1438                 if (req->l_sl_policy.prev == &lock->l_sl_policy) {
1439                         lock->l_sl_policy.next = NULL;
1440                 } else {
1441                         lock->l_sl_policy.prev = req->l_sl_policy.prev;
1442                         lock->l_sl_policy.prev->next = &lock->l_sl_policy;
1443                 }
1444                 req->l_sl_policy.prev = NULL;
1445         }
1446 }
1447
1448 void ldlm_lock_cancel(struct ldlm_lock *lock)
1449 {
1450         struct ldlm_resource *res;
1451         struct ldlm_namespace *ns;
1452         ENTRY;
1453
1454         lock_res_and_lock(lock);
1455
1456         res = lock->l_resource;
1457         ns = res->lr_namespace;
1458
1459         /* Please do not, no matter how tempting, remove this LBUG without
1460          * talking to me first. -phik */
1461         if (lock->l_readers || lock->l_writers) {
1462                 LDLM_ERROR(lock, "lock still has references");
1463                 LBUG();
1464         }
1465
1466         ldlm_del_waiting_lock(lock);
1467
1468         /* Releases cancel callback. */
1469         ldlm_cancel_callback(lock);
1470
1471         /* Yes, second time, just in case it was added again while we were
1472            running with no res lock in ldlm_cancel_callback */
1473         ldlm_del_waiting_lock(lock);
1474         ldlm_resource_unlink_lock(lock);
1475         ldlm_lock_destroy_nolock(lock);
1476         unlock_res_and_lock(lock);
1477
1478         EXIT;
1479 }
1480
1481 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1482 {
1483         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1484         ENTRY;
1485
1486         if (lock == NULL)
1487                 RETURN(-EINVAL);
1488
1489         lock->l_ast_data = data;
1490         LDLM_LOCK_PUT(lock);
1491         RETURN(0);
1492 }
1493
1494 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1495 {
1496         struct ldlm_lock *lock;
1497         struct ldlm_resource *res;
1498
1499         spin_lock(&exp->exp_ldlm_data.led_lock);
1500         while(!list_empty(&exp->exp_ldlm_data.led_held_locks)) {
1501                 lock = list_entry(exp->exp_ldlm_data.led_held_locks.next,
1502                                   struct ldlm_lock, l_export_chain);
1503                 res = ldlm_resource_getref(lock->l_resource);
1504                 LDLM_LOCK_GET(lock);
1505                 spin_unlock(&exp->exp_ldlm_data.led_lock);
1506
1507                 LDLM_DEBUG(lock, "export %p", exp);
1508                 ldlm_lock_cancel(lock);
1509                 ldlm_reprocess_all(res);
1510
1511                 ldlm_resource_putref(res);
1512                 LDLM_LOCK_PUT(lock);
1513                 spin_lock(&exp->exp_ldlm_data.led_lock);
1514         }
1515         spin_unlock(&exp->exp_ldlm_data.led_lock);
1516 }
1517
1518 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1519                                         int *flags)
1520 {
1521         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1522         struct ldlm_resource *res;
1523         struct ldlm_namespace *ns;
1524         int granted = 0;
1525         int old_mode, rc;
1526         struct ldlm_lock *mark_lock = NULL;
1527         int join = LDLM_JOIN_NONE;
1528         ldlm_error_t err;
1529         ENTRY;
1530
1531         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1532                 *flags |= LDLM_FL_BLOCK_GRANTED;
1533                 RETURN(lock->l_resource);
1534         }
1535
1536         LASSERTF(new_mode == LCK_PW && lock->l_granted_mode == LCK_PR,
1537                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1538
1539         lock_res_and_lock(lock);
1540
1541         res = lock->l_resource;
1542         ns = res->lr_namespace;
1543
1544         old_mode = lock->l_req_mode;
1545         lock->l_req_mode = new_mode;
1546         if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
1547                 /* remember the lock position where the lock might be
1548                  * added back to the granted list later and also
1549                  * remember the join mode for skiplist fixing. */
1550                 if (LDLM_SL_HEAD(&lock->l_sl_mode))
1551                         join = LDLM_MODE_JOIN_RIGHT;
1552                 else if (LDLM_SL_TAIL(&lock->l_sl_mode))
1553                         join = LDLM_MODE_JOIN_LEFT;
1554                 if (LDLM_SL_HEAD(&lock->l_sl_policy))
1555                         join |= LDLM_POLICY_JOIN_RIGHT;
1556                 else if (LDLM_SL_TAIL(&lock->l_sl_policy))
1557                         join |= LDLM_POLICY_JOIN_LEFT;
1558
1559                 LASSERT(!((join & LDLM_MODE_JOIN_RIGHT) &&
1560                           (join & LDLM_POLICY_JOIN_LEFT)));
1561                 LASSERT(!((join & LDLM_MODE_JOIN_LEFT) &&
1562                           (join & LDLM_POLICY_JOIN_RIGHT)));
1563
1564                 if ((join & LDLM_MODE_JOIN_LEFT) ||
1565                     (join & LDLM_POLICY_JOIN_LEFT))
1566                         mark_lock = list_entry(lock->l_res_link.prev,
1567                                                struct ldlm_lock, l_res_link);
1568                 else if (lock->l_res_link.next != &res->lr_granted)
1569                         mark_lock = list_entry(lock->l_res_link.next,
1570                                                struct ldlm_lock, l_res_link);
1571         }
1572         ldlm_resource_unlink_lock(lock);
1573
1574         /* If this is a local resource, put it on the appropriate list. */
1575         if (res->lr_namespace->ns_client) {
1576                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1577                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1578                 } else {
1579                         /* This should never happen, because of the way the
1580                          * server handles conversions. */
1581                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1582                                    *flags);
1583                         LBUG();
1584
1585                         ldlm_grant_lock(lock, &rpc_list);
1586                         granted = 1;
1587                         /* FIXME: completion handling not with ns_lock held ! */
1588                         if (lock->l_completion_ast)
1589                                 lock->l_completion_ast(lock, 0, NULL);
1590                 }
1591         } else {
1592                 int pflags = 0;
1593                 ldlm_processing_policy policy;
1594                 policy = ldlm_processing_policy_table[res->lr_type];
1595                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1596                 if (rc == LDLM_ITER_STOP) {
1597                         lock->l_req_mode = old_mode;
1598                         ldlm_granted_list_add_lock(lock, mark_lock, join);
1599                         res = NULL;
1600                 } else {
1601                         *flags |= LDLM_FL_BLOCK_GRANTED;
1602                         granted = 1;
1603                 }
1604         }
1605         unlock_res_and_lock(lock);
1606
1607         if (granted)
1608                 ldlm_run_cp_ast_work(&rpc_list);
1609         RETURN(res);
1610 }
1611
1612 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1613 {
1614         struct obd_device *obd = NULL;
1615
1616         if (!((libcfs_debug | D_ERROR) & level))
1617                 return;
1618
1619         if (!lock) {
1620                 CDEBUG(level, "  NULL LDLM lock\n");
1621                 return;
1622         }
1623
1624         CDEBUG(level," -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1625                lock, lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1626                pos, lock->l_pid);
1627         if (lock->l_conn_export != NULL)
1628                 obd = lock->l_conn_export->exp_obd;
1629         if (lock->l_export && lock->l_export->exp_connection) {
1630                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1631                      libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid),
1632                      lock->l_remote_handle.cookie);
1633         } else if (obd == NULL) {
1634                 CDEBUG(level, "  Node: local\n");
1635         } else {
1636                 struct obd_import *imp = obd->u.cli.cl_import;
1637                 CDEBUG(level, "  Node: NID %s (rhandle: "LPX64")\n",
1638                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
1639                        lock->l_remote_handle.cookie);
1640         }
1641         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64"/"LPU64")\n",
1642                   lock->l_resource,
1643                   lock->l_resource->lr_name.name[0],
1644                   lock->l_resource->lr_name.name[1],
1645                   lock->l_resource->lr_name.name[2]);
1646         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1647                "write: %d flags: %#x\n", ldlm_lockname[lock->l_req_mode],
1648                ldlm_lockname[lock->l_granted_mode],
1649                atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers,
1650                lock->l_flags);
1651         if (lock->l_resource->lr_type == LDLM_EXTENT)
1652                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1653                        " (req "LPU64"-"LPU64")\n",
1654                        lock->l_policy_data.l_extent.start,
1655                        lock->l_policy_data.l_extent.end,
1656                        lock->l_req_extent.start, lock->l_req_extent.end);
1657         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1658                 CDEBUG(level, "  Pid: %d Extent: "LPU64" -> "LPU64"\n",
1659                        lock->l_policy_data.l_flock.pid,
1660                        lock->l_policy_data.l_flock.start,
1661                        lock->l_policy_data.l_flock.end);
1662        else if (lock->l_resource->lr_type == LDLM_IBITS)
1663                 CDEBUG(level, "  Bits: "LPX64"\n",
1664                        lock->l_policy_data.l_inodebits.bits);
1665 }
1666
1667 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1668 {
1669         struct ldlm_lock *lock;
1670
1671         if (!((libcfs_debug | D_ERROR) & level))
1672                 return;
1673
1674         lock = ldlm_handle2lock(lockh);
1675         if (lock == NULL)
1676                 return;
1677
1678         ldlm_lock_dump(D_OTHER, lock, 0);
1679
1680         LDLM_LOCK_PUT(lock);
1681 }
1682
1683 void _ldlm_lock_debug(struct ldlm_lock *lock, __u32 level,
1684                       struct libcfs_debug_msg_data *data, const char *fmt,
1685                       ...)
1686 {
1687         va_list args;
1688         cfs_debug_limit_state_t *cdls = data->msg_cdls;
1689
1690         va_start(args, fmt);
1691
1692         if (lock->l_resource == NULL) {
1693                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1694                                    data->msg_fn, data->msg_line, fmt, args,
1695                        " ns: \?\? lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1696                        "res: \?\? rrc=\?\? type: \?\?\? flags: %x remote: "
1697                        LPX64" expref: %d pid: %u\n", lock,
1698                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1699                        lock->l_readers, lock->l_writers,
1700                        ldlm_lockname[lock->l_granted_mode],
1701                        ldlm_lockname[lock->l_req_mode],
1702                        lock->l_flags, lock->l_remote_handle.cookie,
1703                        lock->l_export ?
1704                        atomic_read(&lock->l_export->exp_refcount) : -99,
1705                        lock->l_pid);
1706                 va_end(args);
1707                 return;
1708         }
1709
1710         switch (lock->l_resource->lr_type) {
1711         case LDLM_EXTENT:
1712                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1713                                    data->msg_fn, data->msg_line, fmt, args,
1714                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1715                        "res: "LPU64"/"LPU64" rrc: %d type: %s ["LPU64"->"LPU64
1716                        "] (req "LPU64"->"LPU64") flags: %x remote: "LPX64
1717                        " expref: %d pid: %u\n",
1718                        lock->l_resource->lr_namespace->ns_name, lock,
1719                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1720                        lock->l_readers, lock->l_writers,
1721                        ldlm_lockname[lock->l_granted_mode],
1722                        ldlm_lockname[lock->l_req_mode],
1723                        lock->l_resource->lr_name.name[0],
1724                        lock->l_resource->lr_name.name[1],
1725                        atomic_read(&lock->l_resource->lr_refcount),
1726                        ldlm_typename[lock->l_resource->lr_type],
1727                        lock->l_policy_data.l_extent.start,
1728                        lock->l_policy_data.l_extent.end,
1729                        lock->l_req_extent.start, lock->l_req_extent.end,
1730                        lock->l_flags, lock->l_remote_handle.cookie,
1731                        lock->l_export ?
1732                        atomic_read(&lock->l_export->exp_refcount) : -99,
1733                        lock->l_pid);
1734                 break;
1735
1736         case LDLM_FLOCK:
1737                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1738                                    data->msg_fn, data->msg_line, fmt, args,
1739                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1740                        "res: "LPU64"/"LPU64" rrc: %d type: %s pid: %d "
1741                        "["LPU64"->"LPU64"] flags: %x remote: "LPX64
1742                        " expref: %d pid: %u\n",
1743                        lock->l_resource->lr_namespace->ns_name, lock,
1744                        lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1745                        lock->l_readers, lock->l_writers,
1746                        ldlm_lockname[lock->l_granted_mode],
1747                        ldlm_lockname[lock->l_req_mode],
1748                        lock->l_resource->lr_name.name[0],
1749                        lock->l_resource->lr_name.name[1],
1750                        atomic_read(&lock->l_resource->lr_refcount),
1751                        ldlm_typename[lock->l_resource->lr_type],
1752                        lock->l_policy_data.l_flock.pid,
1753                        lock->l_policy_data.l_flock.start,
1754                        lock->l_policy_data.l_flock.end,
1755                        lock->l_flags, lock->l_remote_handle.cookie,
1756                        lock->l_export ?
1757                        atomic_read(&lock->l_export->exp_refcount) : -99,
1758                        lock->l_pid);
1759                 break;
1760
1761         case LDLM_IBITS:
1762                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1763                                    data->msg_fn, data->msg_line, fmt, args,
1764                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1765                        "res: "LPU64"/"LPU64" bits "LPX64" rrc: %d type: %s "
1766                        "flags: %x remote: "LPX64" expref: %d "
1767                        "pid %u\n",
1768                        lock->l_resource->lr_namespace->ns_name,
1769                        lock, lock->l_handle.h_cookie,
1770                        atomic_read (&lock->l_refc),
1771                        lock->l_readers, lock->l_writers,
1772                        ldlm_lockname[lock->l_granted_mode],
1773                        ldlm_lockname[lock->l_req_mode],
1774                        lock->l_resource->lr_name.name[0],
1775                        lock->l_resource->lr_name.name[1],
1776                        lock->l_policy_data.l_inodebits.bits,
1777                        atomic_read(&lock->l_resource->lr_refcount),
1778                        ldlm_typename[lock->l_resource->lr_type],
1779                        lock->l_flags, lock->l_remote_handle.cookie,
1780                        lock->l_export ?
1781                        atomic_read(&lock->l_export->exp_refcount) : -99,
1782                        lock->l_pid);
1783                 break;
1784
1785         default:
1786                 libcfs_debug_vmsg2(cdls, data->msg_subsys, level, data->msg_file,
1787                                    data->msg_fn, data->msg_line, fmt, args,
1788                        " ns: %s lock: %p/"LPX64" lrc: %d/%d,%d mode: %s/%s "
1789                        "res: "LPU64"/"LPU64" rrc: %d type: %s flags: %x "
1790                        "remote: "LPX64" expref: %d pid: %u\n",
1791                        lock->l_resource->lr_namespace->ns_name,
1792                        lock, lock->l_handle.h_cookie,
1793                        atomic_read (&lock->l_refc),
1794                        lock->l_readers, lock->l_writers,
1795                        ldlm_lockname[lock->l_granted_mode],
1796                        ldlm_lockname[lock->l_req_mode],
1797                        lock->l_resource->lr_name.name[0],
1798                        lock->l_resource->lr_name.name[1],
1799                        atomic_read(&lock->l_resource->lr_refcount),
1800                        ldlm_typename[lock->l_resource->lr_type],
1801                        lock->l_flags, lock->l_remote_handle.cookie,
1802                        lock->l_export ?
1803                        atomic_read(&lock->l_export->exp_refcount) : -99,
1804                        lock->l_pid);
1805                 break;
1806         }
1807         va_end(args);
1808 }
1809 EXPORT_SYMBOL(_ldlm_lock_debug);