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 Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LDLM
  25
  26 #ifdef __KERNEL__
  27 # include <linux/slab.h>
  28 # include <linux/dcache.h>
  29 # include <linux/namei.h>
  30 # include <linux/module.h>
  31 # include <linux/lustre_dlm.h>
  32 #else
  33 # include <liblustre.h>
  34 # include <libcfs/kp30.h>
  35 #endif
  36
  37 #include <linux/obd_class.h>
  38 #include "ldlm_internal.h"
  39
  40 //struct lustre_lock ldlm_everything_lock;
  41
  42 /* lock types */
  43 char *ldlm_lockname[] = {
  44         [0] "--",
  45         [LCK_EX] "EX",
  46         [LCK_PW] "PW",
  47         [LCK_PR] "PR",
  48         [LCK_CW] "CW",
  49         [LCK_CR] "CR",
  50         [LCK_NL] "NL",
  51         [LCK_GROUP] "GROUP"
  52 };
  53 char *ldlm_typename[] = {
  54         [LDLM_PLAIN] "PLN",
  55         [LDLM_EXTENT] "EXT",
  56         [LDLM_FLOCK] "FLK",
  57         [LDLM_IBITS] "IBT",
  58 };
  59
  60 char *ldlm_it2str(int it)
  61 {
  62         switch (it) {
  63         case IT_OPEN:
  64                 return "open";
  65         case IT_CREAT:
  66                 return "creat";
  67         case (IT_OPEN | IT_CREAT):
  68                 return "open|creat";
  69         case IT_READDIR:
  70                 return "readdir";
  71         case IT_GETATTR:
  72                 return "getattr";
  73         case IT_LOOKUP:
  74                 return "lookup";
  75         case IT_UNLINK:
  76                 return "unlink";
  77         case IT_GETXATTR:
  78                 return "getxattr";
  79         case IT_CHDIR:
  80                 return "chdir";
  81         default:
  82                 CERROR("Unknown intent %d\n", it);
  83                 return "UNKNOWN";
  84         }
  85 }
  86
  87 extern kmem_cache_t *ldlm_lock_slab;
  88
  89 static ldlm_processing_policy ldlm_processing_policy_table[] = {
  90         [LDLM_PLAIN] ldlm_process_plain_lock,
  91         [LDLM_EXTENT] ldlm_process_extent_lock,
  92 #ifdef __KERNEL__
  93         [LDLM_FLOCK] ldlm_process_flock_lock,
  94 #endif
  95         [LDLM_IBITS] ldlm_process_inodebits_lock,
  96 };
  97
  98 ldlm_processing_policy ldlm_get_processing_policy(struct ldlm_resource *res)
  99 {
 100         return ldlm_processing_policy_table[res->lr_type];
 101 }
 102
 103 void ldlm_register_intent(struct ldlm_namespace *ns, ldlm_res_policy arg)
 104 {
 105         ns->ns_policy = arg;
 106 }
 107
 108 /*
 109  * REFCOUNTED LOCK OBJECTS
 110  */
 111
 112
 113 /*
 114  * Lock refcounts, during creation:
 115  *   - one special one for allocation, dec'd only once in destroy
 116  *   - one for being a lock that's in-use
 117  *   - one for the addref associated with a new lock
 118  */
 119 struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock)
 120 {
 121         atomic_inc(&lock->l_refc);
 122         return lock;
 123 }
 124
 125 void ldlm_lock_put(struct ldlm_lock *lock)
 126 {
 127         ENTRY;
 128
 129         LASSERT(lock->l_resource != LP_POISON);
 130         LASSERT(atomic_read(&lock->l_refc) > 0);
 131         if (atomic_dec_and_test(&lock->l_refc)) {
 132                 struct ldlm_resource *res;
 133
 134                 LDLM_DEBUG(lock, "final lock_put on destroyed lock, freeing");
 135
 136                 lock_res_and_lock(lock);
 137                 res = lock->l_resource;
 138                 LASSERT(lock->l_destroyed);
 139                 LASSERT(list_empty(&lock->l_res_link));
 140
 141                 if (lock->l_parent)
 142                         LDLM_LOCK_PUT(lock->l_parent);
 143                 unlock_res_and_lock(lock);
 144
 145                 atomic_dec(&res->lr_namespace->ns_locks);
 146                 ldlm_resource_putref(res);
 147                 lock->l_resource = NULL;
 148                 if (lock->l_export)
 149                         class_export_put(lock->l_export);
 150
 151                 if (lock->l_lvb_data != NULL)
 152                         OBD_FREE(lock->l_lvb_data, lock->l_lvb_len);
 153
 154                 OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
 155         }
 156
 157         EXIT;
 158 }
 159
 160 void ldlm_lock_remove_from_lru(struct ldlm_lock *lock)
 161 {
 162         ENTRY;
 163         spin_lock(&lock->l_resource->lr_namespace->ns_unused_lock);
 164         if (!list_empty(&lock->l_lru)) {
 165                 LASSERT(lock->l_resource->lr_type != LDLM_FLOCK);
 166                 list_del_init(&lock->l_lru);
 167                 lock->l_resource->lr_namespace->ns_nr_unused--;
 168                 LASSERT(lock->l_resource->lr_namespace->ns_nr_unused >= 0);
 169         }
 170         spin_unlock(&lock->l_resource->lr_namespace->ns_unused_lock);
 171         EXIT;
 172 }
 173
 174 /* This used to have a 'strict' flact, which recovery would use to mark an
 175  * in-use lock as needing-to-die.  Lest I am ever tempted to put it back, I
 176  * shall explain why it's gone: with the new hash table scheme, once you call
 177  * ldlm_lock_destroy, you can never drop your final references on this lock.
 178  * Because it's not in the hash table anymore.  -phil */
 179 void ldlm_lock_destroy(struct ldlm_lock *lock)
 180 {
 181         ENTRY;
 182
 183         lock_res_and_lock(lock);
 184
 185         if (!list_empty(&lock->l_children)) {
 186                 LDLM_ERROR(lock, "still has children (%p)!",
 187                            lock->l_children.next);
 188                 ldlm_lock_dump(D_ERROR, lock, 0);
 189                 LBUG();
 190         }
 191         if (lock->l_readers || lock->l_writers) {
 192                 LDLM_ERROR(lock, "lock still has references");
 193                 ldlm_lock_dump(D_ERROR, lock, 0);
 194                 LBUG();
 195         }
 196
 197         if (!list_empty(&lock->l_res_link)) {
 198                 LDLM_ERROR(lock, "lock still on resource");
 199                 ldlm_lock_dump(D_ERROR, lock, 0);
 200                 LBUG();
 201         }
 202
 203         if (lock->l_destroyed) {
 204                 LASSERT(list_empty(&lock->l_lru));
 205                 unlock_res_and_lock(lock);
 206                 EXIT;
 207                 return;
 208         }
 209         lock->l_destroyed = 1;
 210
 211         if (lock->l_export) {
 212                 spin_lock(&lock->l_export->exp_ldlm_data.led_lock);
 213                 if (!list_empty(&lock->l_export_chain))
 214                         list_del_init(&lock->l_export_chain);
 215                 spin_unlock(&lock->l_export->exp_ldlm_data.led_lock);
 216         } else {
 217                 LASSERT(list_empty(&lock->l_export_chain));
 218         }
 219
 220         ldlm_lock_remove_from_lru(lock);
 221         class_handle_unhash(&lock->l_handle);
 222
 223 #if 0
 224         /* Wake anyone waiting for this lock */
 225         /* FIXME: I should probably add yet another flag, instead of using
 226          * l_export to only call this on clients */
 227         if (lock->l_export)
 228                 class_export_put(lock->l_export);
 229         lock->l_export = NULL;
 230         if (lock->l_export && lock->l_completion_ast)
 231                 lock->l_completion_ast(lock, 0);
 232 #endif
 233
 234         unlock_res_and_lock(lock);
 235         LDLM_LOCK_PUT(lock);
 236         EXIT;
 237 }
 238
 239 /* this is called by portals_handle2object with the handle lock taken */
 240 static void lock_handle_addref(void *lock)
 241 {
 242         LDLM_LOCK_GET((struct ldlm_lock *)lock);
 243 }
 244
 245 /*
 246  * usage: pass in a resource on which you have done ldlm_resource_get
 247  *        pass in a parent lock on which you have done a ldlm_lock_get
 248  *        after return, ldlm_*_put the resource and parent
 249  * returns: lock with refcount 2 - one for current caller and one for remote
 250  */
 251 static struct ldlm_lock *ldlm_lock_new(struct ldlm_lock *parent,
 252                                        struct ldlm_resource *resource)
 253 {
 254         struct ldlm_lock *lock;
 255         ENTRY;
 256
 257         if (resource == NULL)
 258                 LBUG();
 259
 260         OBD_SLAB_ALLOC(lock, ldlm_lock_slab, SLAB_NOFS, sizeof(*lock));
 261         if (lock == NULL)
 262                 RETURN(NULL);
 263
 264         lock->l_resource = ldlm_resource_getref(resource);
 265
 266         atomic_set(&lock->l_refc, 2);
 267         INIT_LIST_HEAD(&lock->l_children);
 268         INIT_LIST_HEAD(&lock->l_res_link);
 269         INIT_LIST_HEAD(&lock->l_lru);
 270         INIT_LIST_HEAD(&lock->l_export_chain);
 271         INIT_LIST_HEAD(&lock->l_pending_chain);
 272         INIT_LIST_HEAD(&lock->l_tmp);
 273         INIT_LIST_HEAD(&lock->l_bl_ast);
 274         INIT_LIST_HEAD(&lock->l_cp_ast);
 275         init_waitqueue_head(&lock->l_waitq);
 276         lock->l_blocking_lock = NULL;
 277         lock->l_pidb = 0;
 278
 279         atomic_inc(&resource->lr_namespace->ns_locks);
 280
 281         if (parent != NULL) {
 282                 spin_lock(&resource->lr_namespace->ns_hash_lock);
 283                 lock->l_parent = LDLM_LOCK_GET(parent);
 284                 list_add(&lock->l_childof, &parent->l_children);
 285                 spin_unlock(&resource->lr_namespace->ns_hash_lock);
 286         }
 287
 288         INIT_LIST_HEAD(&lock->l_handle.h_link);
 289         class_handle_hash(&lock->l_handle, lock_handle_addref);
 290
 291         RETURN(lock);
 292 }
 293
 294 void unlock_bitlock(struct ldlm_lock *lock);
 295
 296 int ldlm_lock_change_resource(struct ldlm_namespace *ns, struct ldlm_lock *lock,
 297                               struct ldlm_res_id new_resid)
 298 {
 299         struct ldlm_resource *oldres = lock->l_resource;
 300         struct ldlm_resource *newres;
 301         int type;
 302         ENTRY;
 303
 304         LASSERT(ns->ns_client != 0);
 305
 306         lock_res_and_lock(lock);
 307         if (memcmp(&new_resid, &lock->l_resource->lr_name,
 308                    sizeof(lock->l_resource->lr_name)) == 0) {
 309                 /* Nothing to do */
 310                 unlock_res_and_lock(lock);
 311                 RETURN(0);
 312         }
 313
 314         LASSERT(new_resid.name[0] != 0);
 315
 316         /* This function assumes that the lock isn't on any lists */
 317         LASSERT(list_empty(&lock->l_res_link));
 318
 319         type = oldres->lr_type;
 320         newres = ldlm_resource_get(ns, NULL, new_resid, type, 1);
 321         if (newres == NULL) {
 322                 LBUG();
 323                 RETURN(-ENOMEM);
 324         }
 325
 326         lock_res(newres);
 327         lock->l_resource = newres;
 328         unlock_res(newres);
 329         unlock_res(oldres);
 330         unlock_bitlock(lock);
 331
 332         /* ...and the flowers are still standing! */
 333         ldlm_resource_putref(oldres);
 334
 335         RETURN(0);
 336 }
 337
 338 /*
 339  *  HANDLES
 340  */
 341
 342 void ldlm_lock2handle(struct ldlm_lock *lock, struct lustre_handle *lockh)
 343 {
 344         lockh->cookie = lock->l_handle.h_cookie;
 345 }
 346
 347 /* if flags: atomically get the lock and set the flags.
 348  *           Return NULL if flag already set
 349  */
 350
 351 struct ldlm_lock *__ldlm_handle2lock(struct lustre_handle *handle, int flags)
 352 {
 353         struct ldlm_namespace *ns;
 354         struct ldlm_lock *lock = NULL, *retval = NULL;
 355         ENTRY;
 356
 357         LASSERT(handle);
 358
 359         lock = class_handle2object(handle->cookie);
 360         if (lock == NULL)
 361                 RETURN(NULL);
 362
 363         LASSERT(lock->l_resource != NULL);
 364         ns = lock->l_resource->lr_namespace;
 365         LASSERT(ns != NULL);
 366
 367         lock_res_and_lock(lock);
 368
 369         /* It's unlikely but possible that someone marked the lock as
 370          * destroyed after we did handle2object on it */
 371         if (lock->l_destroyed) {
 372                 unlock_res_and_lock(lock);
 373                 CDEBUG(D_INFO, "lock already destroyed: lock %p\n", lock);
 374                 LDLM_LOCK_PUT(lock);
 375                 GOTO(out, retval);
 376         }
 377
 378         if (flags && (lock->l_flags & flags)) {
 379                 unlock_res_and_lock(lock);
 380                 LDLM_LOCK_PUT(lock);
 381                 GOTO(out, retval);
 382         }
 383
 384         if (flags)
 385                 lock->l_flags |= flags;
 386
 387         unlock_res_and_lock(lock);
 388         retval = lock;
 389         EXIT;
 390  out:
 391         return retval;
 392 }
 393
 394 struct ldlm_lock *ldlm_handle2lock_ns(struct ldlm_namespace *ns,
 395                                       struct lustre_handle *handle)
 396 {
 397         struct ldlm_lock *retval = NULL;
 398         retval = __ldlm_handle2lock(handle, 0);
 399         return retval;
 400 }
 401
 402 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 403 {
 404         ldlm_res2desc(lock->l_resource, &desc->l_resource);
 405         desc->l_req_mode = lock->l_req_mode;
 406         desc->l_granted_mode = lock->l_granted_mode;
 407         memcpy(&desc->l_policy_data, &lock->l_policy_data,
 408                sizeof(desc->l_policy_data));
 409 }
 410
 411 void ldlm_add_bl_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 412                            struct list_head *work_list)
 413 {
 414         if ((lock->l_flags & LDLM_FL_AST_SENT) == 0) {
 415                 LDLM_DEBUG(lock, "lock incompatible; sending blocking AST.");
 416                 lock->l_flags |= LDLM_FL_AST_SENT;
 417                 /* If the enqueuing client said so, tell the AST recipient to
 418                  * discard dirty data, rather than writing back. */
 419                 if (new->l_flags & LDLM_AST_DISCARD_DATA)
 420                         lock->l_flags |= LDLM_FL_DISCARD_DATA;
 421                 LASSERT(list_empty(&lock->l_bl_ast));
 422                 list_add(&lock->l_bl_ast, work_list);
 423                 LDLM_LOCK_GET(lock);
 424                 LASSERT(lock->l_blocking_lock == NULL);
 425                 lock->l_blocking_lock = LDLM_LOCK_GET(new);
 426         }
 427 }
 428
 429 void ldlm_add_cp_work_item(struct ldlm_lock *lock, struct list_head *work_list)
 430 {
 431         if ((lock->l_flags & LDLM_FL_CP_REQD) == 0) {
 432                 LDLM_DEBUG(lock, "lock granted; sending completion AST.");
 433                 lock->l_flags |= LDLM_FL_CP_REQD;
 434                 LASSERT(list_empty(&lock->l_cp_ast));
 435                 list_add(&lock->l_cp_ast, work_list);
 436                 LDLM_LOCK_GET(lock);
 437         }
 438 }
 439
 440 /* must be called with lr_lock held */
 441 void ldlm_add_ast_work_item(struct ldlm_lock *lock, struct ldlm_lock *new,
 442                                 struct list_head *work_list)
 443 {
 444         ENTRY;
 445         check_res_locked(lock->l_resource);
 446         if (new)
 447                 ldlm_add_bl_work_item(lock, new, work_list);
 448         else
 449                 ldlm_add_cp_work_item(lock, work_list);
 450         EXIT;
 451 }
 452
 453 void ldlm_lock_addref(struct lustre_handle *lockh, __u32 mode)
 454 {
 455         struct ldlm_lock *lock;
 456
 457         lock = ldlm_handle2lock(lockh);
 458         ldlm_lock_addref_internal(lock, mode);
 459         LDLM_LOCK_PUT(lock);
 460 }
 461
 462 void ldlm_lock_addref_internal_nolock(struct ldlm_lock *lock, __u32 mode)
 463 {
 464         ldlm_lock_remove_from_lru(lock);
 465         if (mode & (LCK_NL | LCK_CR | LCK_PR))
 466                 lock->l_readers++;
 467         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP))
 468                 lock->l_writers++;
 469         lock->l_last_used = jiffies;
 470         LDLM_LOCK_GET(lock);
 471         LDLM_DEBUG(lock, "ldlm_lock_addref(%s)", ldlm_lockname[mode]);
 472 }
 473
 474 /* only called for local locks */
 475 void ldlm_lock_addref_internal(struct ldlm_lock *lock, __u32 mode)
 476 {
 477         lock_res_and_lock(lock);
 478         ldlm_lock_addref_internal_nolock(lock, mode);
 479         unlock_res_and_lock(lock);
 480 }
 481
 482 void ldlm_lock_decref_internal(struct ldlm_lock *lock, __u32 mode)
 483 {
 484         struct ldlm_namespace *ns;
 485         ENTRY;
 486
 487         lock_res_and_lock(lock);
 488
 489         ns = lock->l_resource->lr_namespace;
 490
 491         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 492         if (mode & (LCK_NL | LCK_CR | LCK_PR)) {
 493                 LASSERT(lock->l_readers > 0);
 494                 lock->l_readers--;
 495         }
 496         if (mode & (LCK_EX | LCK_CW | LCK_PW | LCK_GROUP)) {
 497                 LASSERT(lock->l_writers > 0);
 498                 lock->l_writers--;
 499         }
 500
 501         if (lock->l_flags & LDLM_FL_LOCAL &&
 502             !lock->l_readers && !lock->l_writers) {
 503                 /* If this is a local lock on a server namespace and this was
 504                  * the last reference, cancel the lock. */
 505                 CDEBUG(D_INFO, "forcing cancel of local lock\n");
 506                 lock->l_flags |= LDLM_FL_CBPENDING;
 507         }
 508
 509         if (!lock->l_readers && !lock->l_writers &&
 510             (lock->l_flags & LDLM_FL_CBPENDING)) {
 511                 /* If we received a blocked AST and this was the last reference,
 512                  * run the callback. */
 513                 if (ns->ns_client == LDLM_NAMESPACE_SERVER && lock->l_export)
 514                         CERROR("FL_CBPENDING set on non-local lock--just a "
 515                                "warning\n");
 516
 517                 LDLM_DEBUG(lock, "final decref done on cbpending lock");
 518
 519                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 520                 ldlm_lock_remove_from_lru(lock);
 521                 unlock_res_and_lock(lock);
 522                 if ((lock->l_flags & LDLM_FL_ATOMIC_CB) ||
 523                                 ldlm_bl_to_thread(ns, NULL, lock) != 0)
 524                         ldlm_handle_bl_callback(ns, NULL, lock);
 525         } else if (ns->ns_client == LDLM_NAMESPACE_CLIENT &&
 526                    !lock->l_readers && !lock->l_writers) {
 527                 /* If this is a client-side namespace and this was the last
 528                  * reference, put it on the LRU. */
 529                 LASSERT(list_empty(&lock->l_lru));
 530                 LASSERT(ns->ns_nr_unused >= 0);
 531                 spin_lock(&ns->ns_unused_lock);
 532                 list_add_tail(&lock->l_lru, &ns->ns_unused_list);
 533                 ns->ns_nr_unused++;
 534                 spin_unlock(&ns->ns_unused_lock);
 535                 unlock_res_and_lock(lock);
 536                 ldlm_cancel_lru(ns, LDLM_ASYNC);
 537         } else {
 538                 unlock_res_and_lock(lock);
 539         }
 540
 541         LDLM_LOCK_PUT(lock);    /* matches the ldlm_lock_get in addref */
 542
 543         EXIT;
 544 }
 545
 546 void ldlm_lock_decref(struct lustre_handle *lockh, __u32 mode)
 547 {
 548         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 549         LASSERTF(lock != NULL, "can't find lockh "LPX64"\n", lockh->cookie);
 550         ldlm_lock_decref_internal(lock, mode);
 551         LDLM_LOCK_PUT(lock);
 552 }
 553
 554 /* This will drop a lock reference and mark it for destruction, but will not
 555  * necessarily cancel the lock before returning. */
 556 void ldlm_lock_decref_and_cancel(struct lustre_handle *lockh, __u32 mode)
 557 {
 558         struct ldlm_lock *lock = __ldlm_handle2lock(lockh, 0);
 559         ENTRY;
 560
 561         LASSERT(lock != NULL);
 562
 563         LDLM_DEBUG(lock, "ldlm_lock_decref(%s)", ldlm_lockname[mode]);
 564         lock_res_and_lock(lock);
 565         lock->l_flags |= LDLM_FL_CBPENDING;
 566         unlock_res_and_lock(lock);
 567         ldlm_lock_decref_internal(lock, mode);
 568         LDLM_LOCK_PUT(lock);
 569 }
 570
 571 /* NOTE: called by
 572  *  - ldlm_lock_enqueue
 573  *  - ldlm_reprocess_queue
 574  *  - ldlm_lock_convert
 575  *
 576  * must be called with lr_lock held
 577  */
 578 void ldlm_grant_lock(struct ldlm_lock *lock, struct list_head *work_list)
 579 {
 580         struct ldlm_resource *res = lock->l_resource;
 581         ENTRY;
 582
 583         check_res_locked(res);
 584
 585         lock->l_granted_mode = lock->l_req_mode;
 586         ldlm_resource_add_lock(res, &res->lr_granted, lock);
 587
 588         if (lock->l_granted_mode < res->lr_most_restr)
 589                 res->lr_most_restr = lock->l_granted_mode;
 590
 591         if (work_list && lock->l_completion_ast != NULL)
 592                 ldlm_add_ast_work_item(lock, NULL, work_list);
 593
 594         EXIT;
 595 }
 596
 597 /* returns a referenced lock or NULL.  See the flag descriptions below, in the
 598  * comment above ldlm_lock_match */
 599 static struct ldlm_lock *search_queue(struct list_head *queue, ldlm_mode_t mode,
 600                                       ldlm_policy_data_t *policy,
 601                                       struct ldlm_lock *old_lock, int flags)
 602 {
 603         struct ldlm_lock *lock;
 604         struct list_head *tmp;
 605
 606         list_for_each(tmp, queue) {
 607                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 608
 609                 if (lock == old_lock)
 610                         break;
 611
 612                 /* llite sometimes wants to match locks that will be
 613                  * canceled when their users drop, but we allow it to match
 614                  * if it passes in CBPENDING and the lock still has users.
 615                  * this is generally only going to be used by children
 616                  * whose parents already hold a lock so forward progress
 617                  * can still happen. */
 618                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 619                     !(flags & LDLM_FL_CBPENDING))
 620                         continue;
 621                 if (lock->l_flags & LDLM_FL_CBPENDING &&
 622                     lock->l_readers == 0 && lock->l_writers == 0)
 623                         continue;
 624
 625                 if (!(lock->l_req_mode & mode))
 626                         continue;
 627
 628                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 629                     (lock->l_policy_data.l_extent.start >
 630                      policy->l_extent.start ||
 631                      lock->l_policy_data.l_extent.end < policy->l_extent.end))
 632                         continue;
 633
 634                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 635                     mode == LCK_GROUP &&
 636                     lock->l_policy_data.l_extent.gid != policy->l_extent.gid)
 637                         continue;
 638
 639                 /* We match if we have existing lock with same or wider set
 640                    of bits. */
 641                 if (lock->l_resource->lr_type == LDLM_IBITS &&
 642                      ((lock->l_policy_data.l_inodebits.bits &
 643                       policy->l_inodebits.bits) !=
 644                       policy->l_inodebits.bits))
 645                         continue;
 646
 647                 if (lock->l_destroyed || (lock->l_flags & LDLM_FL_FAILED))
 648                         continue;
 649
 650                 if ((flags & LDLM_FL_LOCAL_ONLY) &&
 651                     !(lock->l_flags & LDLM_FL_LOCAL))
 652                         continue;
 653
 654                 if (flags & LDLM_FL_TEST_LOCK)
 655                         LDLM_LOCK_GET(lock);
 656                 else
 657                         ldlm_lock_addref_internal_nolock(lock, mode);
 658                 return lock;
 659         }
 660
 661         return NULL;
 662 }
 663
 664 void ldlm_lock_allow_match(struct ldlm_lock *lock)
 665 {
 666         lock_res_and_lock(lock);
 667         lock->l_flags |= LDLM_FL_CAN_MATCH;
 668         wake_up(&lock->l_waitq);
 669         unlock_res_and_lock(lock);
 670 }
 671
 672 /* Can be called in two ways:
 673  *
 674  * If 'ns' is NULL, then lockh describes an existing lock that we want to look
 675  * for a duplicate of.
 676  *
 677  * Otherwise, all of the fields must be filled in, to match against.
 678  *
 679  * If 'flags' contains LDLM_FL_LOCAL_ONLY, then only match local locks on the
 680  *     server (ie, connh is NULL)
 681  * If 'flags' contains LDLM_FL_BLOCK_GRANTED, then only locks on the granted
 682  *     list will be considered
 683  * If 'flags' contains LDLM_FL_CBPENDING, then locks that have been marked
 684  *     to be canceled can still be matched as long as they still have reader
 685  *     or writer refernces
 686  * If 'flags' contains LDLM_FL_TEST_LOCK, then don't actually reference a lock,
 687  *     just tell us if we would have matched.
 688  *
 689  * Returns 1 if it finds an already-existing lock that is compatible; in this
 690  * case, lockh is filled in with a addref()ed lock
 691  */
 692 int ldlm_lock_match(struct ldlm_namespace *ns, int flags,
 693                     struct ldlm_res_id *res_id, __u32 type,
 694                     ldlm_policy_data_t *policy, ldlm_mode_t mode,
 695                     struct lustre_handle *lockh)
 696 {
 697         struct ldlm_resource *res;
 698         struct ldlm_lock *lock, *old_lock = NULL;
 699         int rc = 0;
 700         ENTRY;
 701
 702         if (ns == NULL) {
 703                 old_lock = ldlm_handle2lock(lockh);
 704                 LASSERT(old_lock);
 705
 706                 ns = old_lock->l_resource->lr_namespace;
 707                 res_id = &old_lock->l_resource->lr_name;
 708                 type = old_lock->l_resource->lr_type;
 709                 mode = old_lock->l_req_mode;
 710         }
 711
 712         res = ldlm_resource_get(ns, NULL, *res_id, type, 0);
 713         if (res == NULL) {
 714                 LASSERT(old_lock == NULL);
 715                 RETURN(0);
 716         }
 717
 718         lock_res(res);
 719
 720         lock = search_queue(&res->lr_granted, mode, policy, old_lock, flags);
 721         if (lock != NULL)
 722                 GOTO(out, rc = 1);
 723         if (flags & LDLM_FL_BLOCK_GRANTED)
 724                 GOTO(out, rc = 0);
 725         lock = search_queue(&res->lr_converting, mode, policy, old_lock, flags);
 726         if (lock != NULL)
 727                 GOTO(out, rc = 1);
 728         lock = search_queue(&res->lr_waiting, mode, policy, old_lock, flags);
 729         if (lock != NULL)
 730                 GOTO(out, rc = 1);
 731
 732         EXIT;
 733  out:
 734         unlock_res(res);
 735         ldlm_resource_putref(res);
 736
 737         if (lock) {
 738                 ldlm_lock2handle(lock, lockh);
 739                 if (!(lock->l_flags & LDLM_FL_CAN_MATCH)) {
 740                         struct l_wait_info lwi;
 741                         if (lock->l_completion_ast) {
 742                                 int err = lock->l_completion_ast(lock,
 743                                                                  LDLM_FL_WAIT_NOREPROC,
 744                                                                  NULL);
 745                                 if (err) {
 746                                         rc = 0;
 747                                         goto out2;
 748                                 }
 749                         }
 750
 751                         lwi = LWI_TIMEOUT_INTR(obd_timeout*HZ, NULL,NULL,NULL);
 752
 753                         /* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
 754                         l_wait_event(lock->l_waitq,
 755                                      (lock->l_flags & LDLM_FL_CAN_MATCH), &lwi);
 756                 }
 757         }
 758
 759 out2:
 760         if (rc) {
 761                 LDLM_DEBUG(lock, "matched ("LPU64" "LPU64")",
 762                            type == LDLM_PLAIN ? res_id->name[2] :
 763                                 policy->l_extent.start,
 764                            type == LDLM_PLAIN ? res_id->name[3] :
 765                            policy->l_extent.end);
 766         } else if (!(flags & LDLM_FL_TEST_LOCK)) {/* less verbose for test-only */
 767                 LDLM_DEBUG_NOLOCK("not matched ns %p type %u mode %u res "
 768                                   LPU64"/"LPU64" ("LPU64" "LPU64")", ns,
 769                                   type, mode, res_id->name[0], res_id->name[1],
 770                                   type == LDLM_PLAIN ? res_id->name[2] :
 771                                   policy->l_extent.start,
 772                                   type == LDLM_PLAIN ? res_id->name[3] :
 773                                   policy->l_extent.end);
 774         }
 775
 776         if (old_lock)
 777                 LDLM_LOCK_PUT(old_lock);
 778         if (flags & LDLM_FL_TEST_LOCK && rc)
 779                 LDLM_LOCK_PUT(lock);
 780
 781         return rc;
 782 }
 783
 784 /* Returns a referenced lock */
 785 struct ldlm_lock *ldlm_lock_create(struct ldlm_namespace *ns,
 786                                    struct lustre_handle *parent_lock_handle,
 787                                    struct ldlm_res_id res_id, __u32 type,
 788                                    ldlm_mode_t mode,
 789                                    ldlm_blocking_callback blocking,
 790                                    ldlm_completion_callback completion,
 791                                    ldlm_glimpse_callback glimpse,
 792                                    void *data, __u32 lvb_len)
 793 {
 794         struct ldlm_resource *res, *parent_res = NULL;
 795         struct ldlm_lock *lock, *parent_lock = NULL;
 796         ENTRY;
 797
 798         if (parent_lock_handle) {
 799                 parent_lock = ldlm_handle2lock(parent_lock_handle);
 800                 if (parent_lock)
 801                         parent_res = parent_lock->l_resource;
 802         }
 803
 804         res = ldlm_resource_get(ns, parent_res, res_id,
 805                                 type, 1);
 806         if (res == NULL)
 807                 RETURN(NULL);
 808
 809         lock = ldlm_lock_new(parent_lock, res);
 810         ldlm_resource_putref(res);
 811         if (parent_lock != NULL)
 812                 LDLM_LOCK_PUT(parent_lock);
 813
 814         if (lock == NULL)
 815                 RETURN(NULL);
 816
 817         lock->l_req_mode = mode;
 818         lock->l_ast_data = data;
 819         lock->l_blocking_ast = blocking;
 820         lock->l_completion_ast = completion;
 821         lock->l_glimpse_ast = glimpse;
 822         lock->l_pid = current->pid;
 823
 824         if (lvb_len) {
 825                 lock->l_lvb_len = lvb_len;
 826                 OBD_ALLOC(lock->l_lvb_data, lvb_len);
 827                 if (lock->l_lvb_data == NULL) {
 828                         OBD_SLAB_FREE(lock, ldlm_lock_slab, sizeof(*lock));
 829                         RETURN(NULL);
 830                 }
 831         }
 832
 833         RETURN(lock);
 834 }
 835
 836 ldlm_error_t ldlm_lock_enqueue(struct ldlm_namespace *ns,
 837                                struct ldlm_lock **lockp,
 838                                void *cookie, int *flags)
 839 {
 840         struct ldlm_lock *lock = *lockp;
 841         struct ldlm_resource *res = lock->l_resource;
 842         int local = res->lr_namespace->ns_client;
 843         ldlm_processing_policy policy;
 844         ldlm_error_t rc = ELDLM_OK;
 845         ENTRY;
 846
 847         /* policies are not executed on the client or during replay */
 848         if ((*flags & (LDLM_FL_HAS_INTENT|LDLM_FL_REPLAY)) == LDLM_FL_HAS_INTENT
 849             && !local && ns->ns_policy) {
 850                 rc = ns->ns_policy(ns, lockp, cookie, lock->l_req_mode, *flags,
 851                                    NULL);
 852                 if (rc == ELDLM_LOCK_REPLACED) {
 853                         /* The lock that was returned has already been granted,
 854                          * and placed into lockp.  If it's not the same as the
 855                          * one we passed in, then destroy the old one and our
 856                          * work here is done. */
 857                         if (lock != *lockp) {
 858                                 ldlm_lock_destroy(lock);
 859                                 LDLM_LOCK_PUT(lock);
 860                         }
 861                         *flags |= LDLM_FL_LOCK_CHANGED;
 862                         RETURN(0);
 863                 } else if (rc == ELDLM_LOCK_ABORTED ||
 864                            (rc == 0 && (*flags & LDLM_FL_INTENT_ONLY))) {
 865                         ldlm_lock_destroy(lock);
 866                         RETURN(rc);
 867                 }
 868                 LASSERT(rc == ELDLM_OK);
 869         }
 870
 871         lock_res_and_lock(lock);
 872         if (local && lock->l_req_mode == lock->l_granted_mode) {
 873                 /* The server returned a blocked lock, but it was granted before
 874                  * we got a chance to actually enqueue it.  We don't need to do
 875                  * anything else. */
 876                 *flags &= ~(LDLM_FL_BLOCK_GRANTED |
 877                             LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_WAIT);
 878                 GOTO(out, ELDLM_OK);
 879         }
 880
 881         /* Some flags from the enqueue want to make it into the AST, via the
 882          * lock's l_flags. */
 883         lock->l_flags |= (*flags & LDLM_AST_DISCARD_DATA);
 884
 885         /* This distinction between local lock trees is very important; a client
 886          * namespace only has information about locks taken by that client, and
 887          * thus doesn't have enough information to decide for itself if it can
 888          * be granted (below).  In this case, we do exactly what the server
 889          * tells us to do, as dictated by the 'flags'.
 890          *
 891          * We do exactly the same thing during recovery, when the server is
 892          * more or less trusting the clients not to lie.
 893          *
 894          * FIXME (bug 268): Detect obvious lies by checking compatibility in
 895          * granted/converting queues. */
 896         ldlm_resource_unlink_lock(lock);
 897         if (local) {
 898                 if (*flags & LDLM_FL_BLOCK_CONV)
 899                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
 900                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
 901                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
 902                 else
 903                         ldlm_grant_lock(lock, NULL);
 904                 GOTO(out, ELDLM_OK);
 905         } else if (*flags & LDLM_FL_REPLAY) {
 906                 if (*flags & LDLM_FL_BLOCK_CONV) {
 907                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
 908                         GOTO(out, ELDLM_OK);
 909                 } else if (*flags & LDLM_FL_BLOCK_WAIT) {
 910                         ldlm_resource_add_lock(res, &res->lr_waiting, lock);
 911                         GOTO(out, ELDLM_OK);
 912                 } else if (*flags & LDLM_FL_BLOCK_GRANTED) {
 913                         ldlm_grant_lock(lock, NULL);
 914                         GOTO(out, ELDLM_OK);
 915                 }
 916                 /* If no flags, fall through to normal enqueue path. */
 917         }
 918
 919         policy = ldlm_processing_policy_table[res->lr_type];
 920         policy(lock, flags, 1, &rc, NULL);
 921         EXIT;
 922 out:
 923         unlock_res_and_lock(lock);
 924         return rc;
 925 }
 926
 927 /* Must be called with namespace taken: queue is waiting or converting. */
 928 int ldlm_reprocess_queue(struct ldlm_resource *res, struct list_head *queue,
 929                          struct list_head *work_list)
 930 {
 931         struct list_head *tmp, *pos;
 932         ldlm_processing_policy policy;
 933         int flags;
 934         int rc = LDLM_ITER_CONTINUE;
 935         ldlm_error_t err;
 936         ENTRY;
 937
 938         check_res_locked(res);
 939
 940         policy = ldlm_processing_policy_table[res->lr_type];
 941         LASSERT(policy);
 942
 943         list_for_each_safe(tmp, pos, queue) {
 944                 struct ldlm_lock *pending;
 945                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
 946
 947                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
 948
 949                 flags = 0;
 950                 rc = policy(pending, &flags, 0, &err, work_list);
 951                 if (rc != LDLM_ITER_CONTINUE)
 952                         break;
 953         }
 954
 955         RETURN(rc);
 956 }
 957
 958 int ldlm_run_bl_ast_work(struct list_head *rpc_list)
 959 {
 960         struct list_head *tmp, *pos;
 961         struct ldlm_lock_desc d;
 962         int rc = 0, retval = 0;
 963         ENTRY;
 964
 965         list_for_each_safe(tmp, pos, rpc_list) {
 966                 struct ldlm_lock *lock =
 967                         list_entry(tmp, struct ldlm_lock, l_bl_ast);
 968
 969                 /* nobody should touch l_bl_ast */
 970                 lock_res_and_lock(lock);
 971                 list_del_init(&lock->l_bl_ast);
 972
 973                 LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
 974                 LASSERT(lock->l_bl_ast_run == 0);
 975                 LASSERT(lock->l_blocking_lock);
 976                 lock->l_bl_ast_run++;
 977                 unlock_res_and_lock(lock);
 978
 979                 ldlm_lock2desc(lock->l_blocking_lock, &d);
 980
 981                 LDLM_LOCK_PUT(lock->l_blocking_lock);
 982                 lock->l_blocking_lock = NULL;
 983                 rc = lock->l_blocking_ast(lock, &d, NULL, LDLM_CB_BLOCKING);
 984
 985                 if (rc == -ERESTART)
 986                         retval = rc;
 987                 else if (rc)
 988                         CDEBUG(D_DLMTRACE, "Failed AST - should clean & "
 989                                "disconnect client\n");
 990                 LDLM_LOCK_PUT(lock);
 991         }
 992         RETURN(retval);
 993 }
 994
 995 int ldlm_run_cp_ast_work(struct list_head *rpc_list)
 996 {
 997         struct list_head *tmp, *pos;
 998         int rc = 0, retval = 0;
 999         ENTRY;
1000
1001         /* It's possible to receive a completion AST before we've set
1002          * the l_completion_ast pointer: either because the AST arrived
1003          * before the reply, or simply because there's a small race
1004          * window between receiving the reply and finishing the local
1005          * enqueue. (bug 842)
1006          *
1007          * This can't happen with the blocking_ast, however, because we
1008          * will never call the local blocking_ast until we drop our
1009          * reader/writer reference, which we won't do until we get the
1010          * reply and finish enqueueing. */
1011
1012         list_for_each_safe(tmp, pos, rpc_list) {
1013                 struct ldlm_lock *lock =
1014                         list_entry(tmp, struct ldlm_lock, l_cp_ast);
1015
1016                 /* nobody should touch l_cp_ast */
1017                 lock_res_and_lock(lock);
1018                 list_del_init(&lock->l_cp_ast);
1019                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
1020                 lock->l_flags &= ~LDLM_FL_CP_REQD;
1021                 unlock_res_and_lock(lock);
1022
1023                 if (lock->l_completion_ast != NULL)
1024                         rc = lock->l_completion_ast(lock, 0, 0);
1025
1026                 if (rc == -ERESTART)
1027                         retval = rc;
1028                 else if (rc)
1029                         CDEBUG(D_DLMTRACE, "Failed AST - should clean & "
1030                                "disconnect client\n");
1031                 LDLM_LOCK_PUT(lock);
1032         }
1033         RETURN(retval);
1034 }
1035
1036 static int reprocess_one_queue(struct ldlm_resource *res, void *closure)
1037 {
1038         ldlm_reprocess_all(res);
1039         return LDLM_ITER_CONTINUE;
1040 }
1041
1042 void ldlm_reprocess_all_ns(struct ldlm_namespace *ns)
1043 {
1044         struct list_head *tmp;
1045         int i, rc;
1046
1047         spin_lock(&ns->ns_hash_lock);
1048         for (i = 0; i < RES_HASH_SIZE; i++) {
1049                 tmp = ns->ns_hash[i].next;
1050                 while (tmp != &(ns->ns_hash[i])) {
1051                         struct ldlm_resource *res =
1052                                 list_entry(tmp, struct ldlm_resource, lr_hash);
1053
1054                         ldlm_resource_getref(res);
1055                         spin_unlock(&ns->ns_hash_lock);
1056
1057                         rc = reprocess_one_queue(res, NULL);
1058
1059                         spin_lock(&ns->ns_hash_lock);
1060                         tmp = tmp->next;
1061                         ldlm_resource_putref_locked(res);
1062
1063                         if (rc == LDLM_ITER_STOP)
1064                                 GOTO(out, rc);
1065                 }
1066         }
1067  out:
1068         spin_unlock(&ns->ns_hash_lock);
1069         EXIT;
1070 }
1071
1072 void ldlm_reprocess_all(struct ldlm_resource *res)
1073 {
1074         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1075         int rc;
1076         ENTRY;
1077
1078         /* Local lock trees don't get reprocessed. */
1079         if (res->lr_namespace->ns_client) {
1080                 EXIT;
1081                 return;
1082         }
1083
1084  restart:
1085         lock_res(res);
1086         rc = ldlm_reprocess_queue(res, &res->lr_converting, &rpc_list);
1087         if (rc == LDLM_ITER_CONTINUE)
1088                 ldlm_reprocess_queue(res, &res->lr_waiting, &rpc_list);
1089         unlock_res(res);
1090
1091         rc = ldlm_run_cp_ast_work(&rpc_list);
1092         if (rc == -ERESTART) {
1093                 LASSERT(list_empty(&rpc_list));
1094                 goto restart;
1095         }
1096         EXIT;
1097 }
1098
1099 void ldlm_cancel_callback(struct ldlm_lock *lock)
1100 {
1101         check_res_locked(lock->l_resource);
1102
1103         if (!(lock->l_flags & LDLM_FL_CANCEL)) {
1104                 lock->l_flags |= LDLM_FL_CANCEL;
1105                 if (lock->l_blocking_ast) {
1106                         unlock_res_and_lock(lock);
1107                         lock->l_blocking_ast(lock, NULL, lock->l_ast_data,
1108                                              LDLM_CB_CANCELING);
1109                         lock_res_and_lock(lock);
1110                 } else {
1111                         LDLM_DEBUG(lock, "no blocking ast");
1112                 }
1113         }
1114 }
1115
1116 void ldlm_lock_cancel(struct ldlm_lock *lock)
1117 {
1118         struct ldlm_resource *res;
1119         struct ldlm_namespace *ns;
1120         ENTRY;
1121
1122         ldlm_del_waiting_lock(lock);
1123         lock_res_and_lock(lock);
1124
1125         res = lock->l_resource;
1126         ns = res->lr_namespace;
1127
1128         /* Please do not, no matter how tempting, remove this LBUG without
1129          * talking to me first. -phik */
1130         if (lock->l_readers || lock->l_writers) {
1131                 LDLM_ERROR(lock, "lock still has references");
1132                 LBUG();
1133         }
1134
1135         ldlm_cancel_callback(lock);
1136
1137         ldlm_resource_unlink_lock(lock);
1138         unlock_res_and_lock(lock);
1139
1140         ldlm_lock_destroy(lock);
1141
1142         EXIT;
1143 }
1144
1145 int ldlm_lock_set_data(struct lustre_handle *lockh, void *data)
1146 {
1147         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
1148         ENTRY;
1149
1150         if (lock == NULL)
1151                 RETURN(-EINVAL);
1152
1153         lock->l_ast_data = data;
1154         LDLM_LOCK_PUT(lock);
1155         RETURN(0);
1156 }
1157
1158 void ldlm_cancel_locks_for_export(struct obd_export *exp)
1159 {
1160         struct ldlm_lock *lock;
1161         struct ldlm_resource *res;
1162
1163         spin_lock(&exp->exp_ldlm_data.led_lock);
1164         while(!list_empty(&exp->exp_ldlm_data.led_held_locks)) {
1165                 lock = list_entry(exp->exp_ldlm_data.led_held_locks.next,
1166                                   struct ldlm_lock, l_export_chain);
1167                 res = ldlm_resource_getref(lock->l_resource);
1168                 LDLM_LOCK_GET(lock);
1169                 spin_unlock(&exp->exp_ldlm_data.led_lock);
1170
1171                 LDLM_DEBUG(lock, "export %p", exp);
1172                 ldlm_lock_cancel(lock);
1173                 ldlm_reprocess_all(res);
1174
1175                 ldlm_resource_putref(res);
1176                 LDLM_LOCK_PUT(lock);
1177                 spin_lock(&exp->exp_ldlm_data.led_lock);
1178         }
1179         spin_unlock(&exp->exp_ldlm_data.led_lock);
1180 }
1181
1182 struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
1183                                         int *flags)
1184 {
1185         struct list_head rpc_list = LIST_HEAD_INIT(rpc_list);
1186         struct ldlm_resource *res;
1187         struct ldlm_namespace *ns;
1188         int granted = 0;
1189         int old_mode, rc;
1190         ldlm_error_t err;
1191         ENTRY;
1192
1193         if (new_mode == lock->l_granted_mode) { // No changes? Just return.
1194                 *flags |= LDLM_FL_BLOCK_GRANTED;
1195                 RETURN(lock->l_resource);
1196         }
1197
1198         LASSERTF(new_mode == LCK_PW && lock->l_granted_mode == LCK_PR,
1199                  "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
1200
1201         lock_res_and_lock(lock);
1202
1203         res = lock->l_resource;
1204         ns = res->lr_namespace;
1205
1206         old_mode = lock->l_req_mode;
1207         lock->l_req_mode = new_mode;
1208         ldlm_resource_unlink_lock(lock);
1209
1210         /* If this is a local resource, put it on the appropriate list. */
1211         if (res->lr_namespace->ns_client) {
1212                 if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
1213                         ldlm_resource_add_lock(res, &res->lr_converting, lock);
1214                 } else {
1215                         /* This should never happen, because of the way the
1216                          * server handles conversions. */
1217                         LDLM_ERROR(lock, "Erroneous flags %d on local lock\n",
1218                                    *flags);
1219                         LBUG();
1220
1221                         ldlm_grant_lock(lock, &rpc_list);
1222                         granted = 1;
1223                         /* FIXME: completion handling not with ns_lock held ! */
1224                         if (lock->l_completion_ast)
1225                                 lock->l_completion_ast(lock, 0, NULL);
1226                 }
1227         } else {
1228                 int pflags = 0;
1229                 ldlm_processing_policy policy;
1230                 policy = ldlm_processing_policy_table[res->lr_type];
1231                 rc = policy(lock, &pflags, 0, &err, &rpc_list);
1232                 if (rc == LDLM_ITER_STOP) {
1233                         lock->l_req_mode = old_mode;
1234                         ldlm_resource_add_lock(res, &res->lr_granted, lock);
1235                         res = NULL;
1236                 } else {
1237                         *flags |= LDLM_FL_BLOCK_GRANTED;
1238                         granted = 1;
1239                 }
1240         }
1241         unlock_res_and_lock(lock);
1242
1243         if (granted)
1244                 ldlm_run_cp_ast_work(&rpc_list);
1245         RETURN(res);
1246 }
1247
1248 void ldlm_lock_dump(int level, struct ldlm_lock *lock, int pos)
1249 {
1250         char str[PTL_NALFMT_SIZE];
1251         struct obd_device *obd = NULL;
1252
1253         if (!((portal_debug | D_ERROR) & level))
1254                 return;
1255
1256         if (!lock) {
1257                 CDEBUG(level, "  NULL LDLM lock\n");
1258                 return;
1259         }
1260
1261         CDEBUG(level, "  -- Lock dump: %p/"LPX64" (rc: %d) (pos: %d) (pid: %d)\n",
1262                lock, lock->l_handle.h_cookie, atomic_read(&lock->l_refc),
1263                pos, lock->l_pid);
1264         if (lock->l_conn_export != NULL)
1265                 obd = lock->l_conn_export->exp_obd;
1266         if (lock->l_export && lock->l_export->exp_connection) {
1267                 CDEBUG(level, "  Node: NID %s on %s (rhandle: "LPX64")\n",
1268                        ptlrpc_peernid2str(&lock->l_export->exp_connection->c_peer, str),
1269                        lock->l_export->exp_connection->c_peer.peer_ni->pni_name,
1270                        lock->l_remote_handle.cookie);
1271         } else if (obd == NULL) {
1272                 CDEBUG(level, "  Node: local\n");
1273         } else {
1274                 struct obd_import *imp = obd->u.cli.cl_import;
1275                 CDEBUG(level, "  Node: NID %s on %s (rhandle: "LPX64")\n",
1276                        ptlrpc_peernid2str(&imp->imp_connection->c_peer, str),
1277                        imp->imp_connection->c_peer.peer_ni->pni_name,
1278                        lock->l_remote_handle.cookie);
1279         }
1280         CDEBUG(level, "  Resource: %p ("LPU64"/"LPU64")\n", lock->l_resource,
1281                lock->l_resource->lr_name.name[0],
1282                lock->l_resource->lr_name.name[1]);
1283         CDEBUG(level, "  Req mode: %s, grant mode: %s, rc: %u, read: %d, "
1284                "write: %d\n", ldlm_lockname[lock->l_req_mode],
1285                ldlm_lockname[lock->l_granted_mode],
1286                atomic_read(&lock->l_refc), lock->l_readers, lock->l_writers);
1287         if (lock->l_resource->lr_type == LDLM_EXTENT)
1288                 CDEBUG(level, "  Extent: "LPU64" -> "LPU64
1289                        " (req "LPU64"-"LPU64")\n",
1290                        lock->l_policy_data.l_extent.start,
1291                        lock->l_policy_data.l_extent.end,
1292                        lock->l_req_extent.start, lock->l_req_extent.end);
1293         else if (lock->l_resource->lr_type == LDLM_FLOCK)
1294                 CDEBUG(level, "  Pid: "LPU64" Extent: "LPU64" -> "LPU64"\n",
1295                        lock->l_policy_data.l_flock.pid,
1296                        lock->l_policy_data.l_flock.start,
1297                        lock->l_policy_data.l_flock.end);
1298         else if (lock->l_resource->lr_type == LDLM_IBITS)
1299                 CDEBUG(level, " Bits: "LPX64"\n",
1300                        lock->l_policy_data.l_inodebits.bits);
1301 }
1302
1303 void ldlm_lock_dump_handle(int level, struct lustre_handle *lockh)
1304 {
1305         struct ldlm_lock *lock;
1306
1307         lock = ldlm_handle2lock(lockh);
1308         if (lock == NULL)
1309                 return;
1310
1311         ldlm_lock_dump(D_OTHER, lock, 0);
1312
1313         LDLM_LOCK_PUT(lock);
1314 }