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 Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * by Cluster File Systems, Inc.
  10  * authors, Peter Braam <braam@clusterfs.com> &
  11  * Phil Schwan <phil@clusterfs.com>
  12  */
  13
  14 #define DEBUG_SUBSYSTEM S_LDLM
  15
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/lustre_dlm.h>
  19 #include <linux/lustre_mds.h>
  20
  21 extern kmem_cache_t *ldlm_lock_slab;
  22 int (*mds_reint_p)(int offset, struct ptlrpc_request *req) = NULL;
  23 int (*mds_getattr_name_p)(int offset, struct ptlrpc_request *req) = NULL;
  24
  25 static int ldlm_plain_compat(struct ldlm_lock *a, struct ldlm_lock *b);
  26 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
  27                               ldlm_mode_t mode, void *data);
  28
  29 ldlm_res_compat ldlm_res_compat_table [] = {
  30         [LDLM_PLAIN] ldlm_plain_compat,
  31         [LDLM_EXTENT] ldlm_extent_compat,
  32         [LDLM_MDSINTENT] ldlm_plain_compat
  33 };
  34
  35 ldlm_res_policy ldlm_res_policy_table [] = {
  36         [LDLM_PLAIN] NULL,
  37         [LDLM_EXTENT] ldlm_extent_policy,
  38         [LDLM_MDSINTENT] ldlm_intent_policy
  39 };
  40
  41 static int ldlm_intent_policy(struct ldlm_lock *lock, void *req_cookie,
  42                               ldlm_mode_t mode, void *data)
  43 {
  44         struct ptlrpc_request *req = req_cookie;
  45         int rc = 0;
  46         ENTRY;
  47
  48         if (!req_cookie)
  49                 RETURN(0);
  50
  51         if (req->rq_reqmsg->bufcount > 1) {
  52                 /* an intent needs to be considered */
  53                 struct ldlm_intent *it = lustre_msg_buf(req->rq_reqmsg, 1);
  54                 struct mds_body *mds_rep;
  55                 struct ldlm_reply *rep;
  56                 struct ldlm_namespace *ns = lock->l_resource->lr_namespace;
  57                 __u32 type = lock->l_resource->lr_type;
  58                 __u64 new_resid[3] = {0, 0, 0}, old_res;
  59                 int bufcount = -1, rc, size[3] = {sizeof(struct ldlm_reply),
  60                                                   sizeof(struct mds_body),
  61                                                   sizeof(struct obdo)};
  62
  63                 it->opc = NTOH__u64(it->opc);
  64
  65                 LDLM_DEBUG(lock, "intent policy, opc: %Ld", it->opc);
  66
  67                 /* prepare reply */
  68                 switch(it->opc) {
  69                 case IT_GETATTR:
  70                         /* Note that in the negative case you may be returning
  71                          * a file and its obdo */
  72                 case IT_CREAT:
  73                 case IT_CREAT|IT_OPEN:
  74                 case IT_MKDIR:
  75                 case IT_SYMLINK:
  76                 case IT_MKNOD:
  77                 case IT_LINK:
  78                 case IT_OPEN:
  79                 case IT_RENAME:
  80                         bufcount = 3;
  81                         break;
  82                 case IT_UNLINK:
  83                         bufcount = 2;
  84                         size[1] = sizeof(struct obdo);
  85                         break;
  86                 case IT_RMDIR:
  87                         bufcount = 1;
  88                         break;
  89                 default:
  90                         LBUG();
  91                 }
  92
  93                 rc = lustre_pack_msg(bufcount, size, NULL, &req->rq_replen,
  94                                      &req->rq_repmsg);
  95                 if (rc) {
  96                         rc = req->rq_status = -ENOMEM;
  97                         RETURN(rc);
  98                 }
  99
 100                 rep = lustre_msg_buf(req->rq_repmsg, 0);
 101                 rep->lock_policy_res1 = 1;
 102
 103                 /* execute policy */
 104                 switch ( it->opc ) {
 105                 case IT_CREAT:
 106                 case IT_CREAT|IT_OPEN:
 107                 case IT_MKDIR:
 108                 case IT_SETATTR:
 109                 case IT_SYMLINK:
 110                 case IT_MKNOD:
 111                 case IT_LINK:
 112                 case IT_UNLINK:
 113                 case IT_RMDIR:
 114                 case IT_RENAME2:
 115                         if (mds_reint_p == NULL)
 116                                 mds_reint_p =
 117                                         inter_module_get_request
 118                                         ("mds_reint", "mds");
 119                         if (IS_ERR(mds_reint_p)) {
 120                                 CERROR("MDSINTENT locks require the MDS "
 121                                        "module.\n");
 122                                 LBUG();
 123                                 RETURN(-EINVAL);
 124                         }
 125                         rc = mds_reint_p(2, req);
 126                         if (rc)
 127                                 LBUG();
 128                         break;
 129                 case IT_GETATTR:
 130                 case IT_READDIR:
 131                 case IT_RENAME:
 132                 case IT_OPEN:
 133                         if (mds_getattr_name_p == NULL)
 134                                 mds_getattr_name_p =
 135                                         inter_module_get_request
 136                                         ("mds_getattr_name", "mds");
 137                         if (IS_ERR(mds_getattr_name_p)) {
 138                                 CERROR("MDSINTENT locks require the MDS "
 139                                        "module.\n");
 140                                 LBUG();
 141                                 RETURN(-EINVAL);
 142                         }
 143                         rc = mds_getattr_name_p(2, req);
 144                         if (rc) {
 145                                 req->rq_status = rc;
 146                                 RETURN(rc);
 147                         }
 148                         break;
 149                 case IT_READDIR|IT_OPEN:
 150                         LBUG();
 151                         break;
 152                 default:
 153                         CERROR("Unhandled intent\n");
 154                         LBUG();
 155                 }
 156
 157                 if (it->opc == IT_UNLINK || it->opc == IT_RMDIR)
 158                         RETURN(ELDLM_LOCK_ABORTED);
 159
 160                 mds_rep = lustre_msg_buf(req->rq_repmsg, 1);
 161                 rep->lock_policy_res2 = req->rq_status;
 162                 new_resid[0] = mds_rep->ino;
 163                 old_res = lock->l_resource->lr_name[0];
 164
 165                 CDEBUG(D_INFO, "remote intent: locking %d instead of"
 166                        "%ld\n", mds_rep->ino, (long)old_res);
 167                 spin_lock(&lock->l_resource->lr_lock);
 168                 if (!ldlm_resource_put(lock->l_resource))
 169                         /* unlock it unless the resource was freed */
 170                         spin_unlock(&lock->l_resource->lr_lock);
 171
 172                 lock->l_resource =
 173                         ldlm_resource_get(ns, NULL, new_resid, type, 1);
 174                 if (lock->l_resource == NULL) {
 175                         LBUG();
 176                         RETURN(-ENOMEM);
 177                 }
 178                 LDLM_DEBUG(lock, "intent policy, old res %ld",
 179                            (long)old_res);
 180                 RETURN(ELDLM_LOCK_CHANGED);
 181         } else {
 182                 int size = sizeof(struct ldlm_reply);
 183                 rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen,
 184                                      &req->rq_repmsg);
 185                 if (rc) {
 186                         CERROR("out of memory\n");
 187                         LBUG();
 188                         RETURN(-ENOMEM);
 189                 }
 190         }
 191         RETURN(rc);
 192 }
 193
 194 static int ldlm_plain_compat(struct ldlm_lock *a, struct ldlm_lock *b)
 195 {
 196         return lockmode_compat(a->l_req_mode, b->l_req_mode);
 197 }
 198
 199 /* Args: referenced, unlocked parent (or NULL)
 200  *       referenced, unlocked resource
 201  * Locks: parent->l_lock */
 202 static struct ldlm_lock *ldlm_lock_new(struct ldlm_lock *parent,
 203                                        struct ldlm_resource *resource)
 204 {
 205         struct ldlm_lock *lock;
 206
 207         if (resource == NULL)
 208                 LBUG();
 209
 210         lock = kmem_cache_alloc(ldlm_lock_slab, SLAB_KERNEL);
 211         if (lock == NULL)
 212                 return NULL;
 213
 214         memset(lock, 0, sizeof(*lock));
 215         lock->l_resource = resource;
 216         INIT_LIST_HEAD(&lock->l_children);
 217         INIT_LIST_HEAD(&lock->l_res_link);
 218         init_waitqueue_head(&lock->l_waitq);
 219         lock->l_lock = SPIN_LOCK_UNLOCKED;
 220
 221         if (parent != NULL) {
 222                 spin_lock(&parent->l_lock);
 223                 lock->l_parent = parent;
 224                 list_add(&lock->l_childof, &parent->l_children);
 225                 spin_unlock(&parent->l_lock);
 226         }
 227
 228         return lock;
 229 }
 230
 231 /* Args: unreferenced, locked lock
 232  *
 233  * Caller must do its own ldlm_resource_put() on lock->l_resource */
 234 void ldlm_lock_free(struct ldlm_lock *lock)
 235 {
 236         if (!list_empty(&lock->l_children)) {
 237                 CERROR("lock %p still has children (%p)!\n", lock,
 238                        lock->l_children.next);
 239                 ldlm_lock_dump(lock);
 240                 LBUG();
 241         }
 242
 243         if (lock->l_readers || lock->l_writers)
 244                 CDEBUG(D_INFO, "lock still has references (%d readers, %d "
 245                        "writers)\n", lock->l_readers, lock->l_writers);
 246
 247         if (lock->l_connection)
 248                 ptlrpc_put_connection(lock->l_connection);
 249         kmem_cache_free(ldlm_lock_slab, lock);
 250 }
 251
 252 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc)
 253 {
 254         ldlm_res2desc(lock->l_resource, &desc->l_resource);
 255         desc->l_req_mode = lock->l_req_mode;
 256         desc->l_granted_mode = lock->l_granted_mode;
 257         memcpy(&desc->l_extent, &lock->l_extent, sizeof(desc->l_extent));
 258         memcpy(desc->l_version, lock->l_version, sizeof(desc->l_version));
 259 }
 260
 261 /* Args: unlocked lock */
 262 void ldlm_lock_addref(struct ldlm_lock *lock, __u32 mode)
 263 {
 264         spin_lock(&lock->l_lock);
 265         if (mode == LCK_NL || mode == LCK_CR || mode == LCK_PR)
 266                 lock->l_readers++;
 267         else
 268                 lock->l_writers++;
 269         spin_unlock(&lock->l_lock);
 270 }
 271
 272 int ldlm_send_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock *new)
 273 {
 274         struct ptlrpc_request *req = NULL;
 275         ENTRY;
 276
 277         spin_lock(&lock->l_lock);
 278         if (lock->l_flags & LDLM_FL_AST_SENT) {
 279                 RETURN(0);
 280         }
 281
 282         lock->l_flags |= LDLM_FL_AST_SENT;
 283
 284         lock->l_blocking_ast(lock, new, lock->l_data, lock->l_data_len, &req);
 285         spin_unlock(&lock->l_lock);
 286         if (req != NULL) {
 287                 struct list_head *list = lock->l_resource->lr_tmp;
 288                 list_add(&req->rq_multi, list);
 289         }
 290         RETURN(1);
 291 }
 292
 293 /* Args: unlocked lock */
 294 void ldlm_lock_decref(struct ldlm_lock *lock, __u32 mode)
 295 {
 296         ENTRY;
 297
 298         if (lock == NULL)
 299                 LBUG();
 300
 301         spin_lock(&lock->l_lock);
 302         if (mode == LCK_NL || mode == LCK_CR || mode == LCK_PR)
 303                 lock->l_readers--;
 304         else
 305                 lock->l_writers--;
 306         if (!lock->l_readers && !lock->l_writers &&
 307             lock->l_flags & LDLM_FL_DYING) {
 308                 /* Read this lock its rights. */
 309                 if (!lock->l_resource->lr_namespace->ns_client) {
 310                         CERROR("LDLM_FL_DYING set on non-local lock!\n");
 311                         LBUG();
 312                 }
 313
 314                 CDEBUG(D_INFO, "final decref done on dying lock, "
 315                        "calling callback.\n");
 316                 spin_unlock(&lock->l_lock);
 317                 /* This function pointer is unfortunately overloaded.  This
 318                  * call will not result in an RPC. */
 319                 lock->l_blocking_ast(lock, NULL, lock->l_data,
 320                                      lock->l_data_len, NULL);
 321         } else
 322                 spin_unlock(&lock->l_lock);
 323         EXIT;
 324 }
 325
 326 /* Args: unlocked lock */
 327 static int _ldlm_lock_compat(struct ldlm_lock *lock, int send_cbs,
 328                              struct list_head *queue)
 329 {
 330         struct list_head *tmp, *pos;
 331         int rc = 0;
 332
 333         list_for_each_safe(tmp, pos, queue) {
 334                 struct ldlm_lock *child;
 335                 ldlm_res_compat compat;
 336
 337                 child = list_entry(tmp, struct ldlm_lock, l_res_link);
 338                 if (lock == child)
 339                         continue;
 340
 341                 compat = ldlm_res_compat_table[child->l_resource->lr_type];
 342                 if (compat(child, lock)) {
 343                         CDEBUG(D_OTHER, "compat function succeded, next.\n");
 344                         continue;
 345                 }
 346                 if (lockmode_compat(child->l_granted_mode, lock->l_req_mode)) {
 347                         CDEBUG(D_OTHER, "lock modes are compatible, next.\n");
 348                         continue;
 349                 }
 350
 351                 rc = 1;
 352
 353                 CDEBUG(D_OTHER, "compat function failed and lock modes incompat\n");
 354                 if (send_cbs && child->l_blocking_ast != NULL) {
 355                         CDEBUG(D_OTHER, "incompatible; sending blocking AST.\n");
 356                         /* It's very difficult to actually send the AST from
 357                          * here, because we'd have to drop the lock before going
 358                          * to sleep to wait for the reply.  Instead we build the
 359                          * packet and send it later. */
 360                         ldlm_send_blocking_ast(child, lock);
 361                 }
 362         }
 363
 364         return rc;
 365 }
 366
 367 /* Args: unlocked lock */
 368 static int ldlm_lock_compat(struct ldlm_lock *lock, int send_cbs)
 369 {
 370         int rc;
 371         ENTRY;
 372
 373         rc = _ldlm_lock_compat(lock, send_cbs, &lock->l_resource->lr_granted);
 374         /* FIXME: should we be sending ASTs to converting? */
 375         rc |= _ldlm_lock_compat(lock, send_cbs,
 376                                 &lock->l_resource->lr_converting);
 377
 378         RETURN(rc);
 379 }
 380
 381 /* Args: locked lock, locked resource */
 382 void ldlm_grant_lock(struct ldlm_resource *res, struct ldlm_lock *lock)
 383 {
 384         ENTRY;
 385
 386         ldlm_resource_add_lock(res, &res->lr_granted, lock);
 387         lock->l_granted_mode = lock->l_req_mode;
 388
 389         if (lock->l_granted_mode < res->lr_most_restr)
 390                 res->lr_most_restr = lock->l_granted_mode;
 391
 392         if (lock->l_completion_ast)
 393                 lock->l_completion_ast(lock, NULL, lock->l_data,
 394                                        lock->l_data_len, NULL);
 395         EXIT;
 396 }
 397
 398 static int search_queue(struct list_head *queue, ldlm_mode_t mode,
 399                         struct ldlm_extent *extent, struct lustre_handle *lockh)
 400 {
 401         struct list_head *tmp;
 402
 403         list_for_each(tmp, queue) {
 404                 struct ldlm_lock *lock;
 405                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 406
 407                 if (lock->l_flags & LDLM_FL_DYING)
 408                         continue;
 409
 410                 /* lock_convert() takes the resource lock, so we're sure that
 411                  * req_mode, lr_type, and l_cookie won't change beneath us */
 412                 if (lock->l_req_mode != mode)
 413                         continue;
 414
 415                 if (lock->l_resource->lr_type == LDLM_EXTENT &&
 416                     (lock->l_extent.start > extent->start ||
 417                      lock->l_extent.end < extent->end))
 418                         continue;
 419
 420                 ldlm_lock_addref(lock, mode);
 421                 ldlm_object2handle(lock, lockh);
 422                 return 1;
 423         }
 424
 425         return 0;
 426 }
 427
 428 /* Must be called with no resource or lock locks held.
 429  *
 430  * Returns 1 if it finds an already-existing lock that is compatible; in this
 431  * case, lockh is filled in with a addref()ed lock */
 432 int ldlm_local_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type,
 433                           void *cookie, int cookielen, ldlm_mode_t mode,
 434                           struct lustre_handle *lockh)
 435 {
 436         struct ldlm_resource *res;
 437         int rc = 0;
 438         ENTRY;
 439
 440         res = ldlm_resource_get(ns, NULL, res_id, type, 0);
 441         if (res == NULL)
 442                 RETURN(0);
 443
 444         spin_lock(&res->lr_lock);
 445         if (search_queue(&res->lr_granted, mode, cookie, lockh))
 446                 GOTO(out, rc = 1);
 447         if (search_queue(&res->lr_converting, mode, cookie, lockh))
 448                 GOTO(out, rc = 1);
 449         if (search_queue(&res->lr_waiting, mode, cookie, lockh))
 450                 GOTO(out, rc = 1);
 451
 452         EXIT;
 453  out:
 454         ldlm_resource_put(res);
 455         spin_unlock(&res->lr_lock);
 456         return rc;
 457 }
 458
 459 /* Must be called without the resource lock held.  Returns a referenced,
 460  * unlocked ldlm_lock. */
 461 ldlm_error_t ldlm_local_lock_create(struct ldlm_namespace *ns,
 462                                     struct lustre_handle *parent_lock_handle,
 463                                     __u64 *res_id, __u32 type,
 464                                      ldlm_mode_t mode,
 465                                     void *data,
 466                                     __u32 data_len,
 467                                     struct lustre_handle *lockh)
 468 {
 469         struct ldlm_resource *res, *parent_res = NULL;
 470         struct ldlm_lock *lock, *parent_lock;
 471
 472         parent_lock = lustre_handle2object(parent_lock_handle);
 473         if (parent_lock)
 474                 parent_res = parent_lock->l_resource;
 475
 476         res = ldlm_resource_get(ns, parent_res, res_id, type, 1);
 477         if (res == NULL)
 478                 RETURN(-ENOMEM);
 479
 480         lock = ldlm_lock_new(parent_lock, res);
 481         if (lock == NULL) {
 482                 spin_lock(&res->lr_lock);
 483                 ldlm_resource_put(res);
 484                 spin_unlock(&res->lr_lock);
 485                 RETURN(-ENOMEM);
 486         }
 487
 488         lock->l_req_mode = mode;
 489         lock->l_data = data;
 490         lock->l_data_len = data_len;
 491         ldlm_lock_addref(lock, mode);
 492
 493         ldlm_object2handle(lock, lockh);
 494         return ELDLM_OK;
 495 }
 496
 497 /* Must be called with lock->l_lock and lock->l_resource->lr_lock not held */
 498 ldlm_error_t ldlm_local_lock_enqueue(struct lustre_handle *lockh,
 499                                      void *cookie, int cookie_len,
 500                                      int *flags,
 501                                      ldlm_lock_callback completion,
 502                                      ldlm_lock_callback blocking)
 503 {
 504         struct ldlm_resource *res;
 505         struct ldlm_lock *lock;
 506         int incompat = 0, local;
 507         ldlm_res_policy policy;
 508         ENTRY;
 509
 510         lock = lustre_handle2object(lockh);
 511         res = lock->l_resource;
 512         local = res->lr_namespace->ns_client;
 513         spin_lock(&res->lr_lock);
 514
 515         lock->l_blocking_ast = blocking;
 516
 517         if (res->lr_type == LDLM_EXTENT)
 518                 memcpy(&lock->l_extent, cookie, sizeof(lock->l_extent));
 519
 520         /* policies are not executed on the client */
 521         if (!local && (policy = ldlm_res_policy_table[res->lr_type])) {
 522                 int rc;
 523
 524                 /* We do this dancing with refcounts and locks because the
 525                  * policy function could send an RPC */
 526                 res->lr_refcount++;
 527                 spin_unlock(&res->lr_lock);
 528
 529                 rc = policy(lock, cookie, lock->l_req_mode, NULL);
 530
 531                 spin_lock(&res->lr_lock);
 532                 ldlm_resource_put(res);
 533
 534                 if (rc == ELDLM_LOCK_CHANGED) {
 535                         spin_unlock(&res->lr_lock);
 536                         res = lock->l_resource;
 537                         spin_lock(&res->lr_lock);
 538                         *flags |= LDLM_FL_LOCK_CHANGED;
 539                 } else if (rc == ELDLM_LOCK_ABORTED) {
 540                         /* Abort. */
 541                         ldlm_resource_put(lock->l_resource);
 542                         ldlm_lock_free(lock);
 543                         RETURN(rc);
 544                 }
 545         }
 546
 547         lock->l_cookie = cookie;
 548         lock->l_cookie_len = cookie_len;
 549
 550         if (local && lock->l_req_mode == lock->l_granted_mode) {
 551                 /* The server returned a blocked lock, but it was granted before
 552                  * we got a chance to actually enqueue it.  We don't need to do
 553                  * anything else. */
 554                 GOTO(out_noput, ELDLM_OK);
 555         }
 556
 557         /* If this is a local resource, put it on the appropriate list. */
 558         list_del_init(&lock->l_res_link);
 559         if (local) {
 560                 if (*flags & LDLM_FL_BLOCK_CONV)
 561                         ldlm_resource_add_lock(res, res->lr_converting.prev,
 562                                                lock);
 563                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
 564                         ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
 565                 else
 566                         ldlm_grant_lock(res, lock);
 567                 GOTO(out, ELDLM_OK);
 568         }
 569
 570         /* FIXME: We may want to optimize by checking lr_most_restr */
 571         if (!list_empty(&res->lr_converting)) {
 572                 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
 573                 *flags |= LDLM_FL_BLOCK_CONV;
 574                 GOTO(out, ELDLM_OK);
 575         }
 576         if (!list_empty(&res->lr_waiting)) {
 577                 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
 578                 *flags |= LDLM_FL_BLOCK_WAIT;
 579                 GOTO(out, ELDLM_OK);
 580         }
 581         incompat = ldlm_lock_compat(lock, 0);
 582         if (incompat) {
 583                 ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
 584                 *flags |= LDLM_FL_BLOCK_GRANTED;
 585                 GOTO(out, ELDLM_OK);
 586         }
 587
 588         ldlm_grant_lock(res, lock);
 589         EXIT;
 590  out:
 591         /* We're called with a lock that has a referenced resource and is not on
 592          * any resource list.  When we added it to a list, we incurred an extra
 593          * reference. */
 594         ldlm_resource_put(lock->l_resource);
 595  out_noput:
 596         /* Don't set 'completion_ast' until here so that if the lock is granted
 597          * immediately we don't do an unnecessary completion call. */
 598         lock->l_completion_ast = completion;
 599         spin_unlock(&res->lr_lock);
 600         return ELDLM_OK;
 601 }
 602
 603 /* Must be called with resource->lr_lock taken. */
 604 static int ldlm_reprocess_queue(struct ldlm_resource *res,
 605                                 struct list_head *converting)
 606 {
 607         struct list_head *tmp, *pos;
 608         ENTRY;
 609
 610         list_for_each_safe(tmp, pos, converting) {
 611                 struct ldlm_lock *pending;
 612                 pending = list_entry(tmp, struct ldlm_lock, l_res_link);
 613
 614                 CDEBUG(D_INFO, "Reprocessing lock %p\n", pending);
 615
 616                 /* the resource lock protects ldlm_lock_compat */
 617                 if (ldlm_lock_compat(pending, 1))
 618                         RETURN(1);
 619
 620                 list_del_init(&pending->l_res_link);
 621                 ldlm_grant_lock(res, pending);
 622
 623                 ldlm_lock_addref(pending, pending->l_req_mode);
 624                 ldlm_lock_decref(pending, pending->l_granted_mode);
 625         }
 626
 627         RETURN(0);
 628 }
 629
 630 /* Must be called with resource->lr_lock not taken. */
 631 void ldlm_reprocess_all(struct ldlm_resource *res)
 632 {
 633         struct list_head rpc_list, *tmp, *pos;
 634
 635         INIT_LIST_HEAD(&rpc_list);
 636
 637         /* Local lock trees don't get reprocessed. */
 638         if (res->lr_namespace->ns_client)
 639                 return;
 640
 641         spin_lock(&res->lr_lock);
 642         res->lr_tmp = &rpc_list;
 643
 644         ldlm_reprocess_queue(res, &res->lr_converting);
 645         if (list_empty(&res->lr_converting))
 646                 ldlm_reprocess_queue(res, &res->lr_waiting);
 647
 648         res->lr_tmp = NULL;
 649         spin_unlock(&res->lr_lock);
 650
 651         list_for_each_safe(tmp, pos, &rpc_list) {
 652                 int rc;
 653                 struct ptlrpc_request *req =
 654                         list_entry(tmp, struct ptlrpc_request, rq_multi);
 655
 656                 CDEBUG(D_INFO, "Sending callback.\n");
 657
 658                 rc = ptlrpc_queue_wait(req);
 659                 rc = ptlrpc_check_status(req, rc);
 660                 ptlrpc_free_req(req);
 661                 if (rc)
 662                         CERROR("Callback send failed: %d\n", rc);
 663         }
 664 }
 665
 666 /* Must be called with lock and lock->l_resource unlocked */
 667 struct ldlm_resource *ldlm_local_lock_cancel(struct ldlm_lock *lock)
 668 {
 669         struct ldlm_resource *res;
 670         ENTRY;
 671
 672         res = lock->l_resource;
 673
 674         spin_lock(&res->lr_lock);
 675         spin_lock(&lock->l_lock);
 676
 677         if (lock->l_readers || lock->l_writers)
 678                 CDEBUG(D_INFO, "lock still has references (%d readers, %d "
 679                        "writers)\n", lock->l_readers, lock->l_writers);
 680
 681         if (ldlm_resource_del_lock(lock))
 682                 res = NULL; /* res was freed, nothing else to do. */
 683         else
 684                 spin_unlock(&res->lr_lock);
 685         ldlm_lock_free(lock);
 686
 687         RETURN(res);
 688 }
 689
 690 /* Must be called with lock and lock->l_resource unlocked */
 691 struct ldlm_resource *ldlm_local_lock_convert(struct lustre_handle *lockh,
 692                                               int new_mode, int *flags)
 693 {
 694         struct ldlm_lock *lock;
 695         struct ldlm_resource *res;
 696         ENTRY;
 697
 698         lock = lustre_handle2object(lockh);
 699         res = lock->l_resource;
 700
 701         spin_lock(&res->lr_lock);
 702
 703         lock->l_req_mode = new_mode;
 704         list_del_init(&lock->l_res_link);
 705
 706         /* If this is a local resource, put it on the appropriate list. */
 707         if (res->lr_namespace->ns_client) {
 708                 if (*flags & LDLM_FL_BLOCK_CONV)
 709                         ldlm_resource_add_lock(res, res->lr_converting.prev,
 710                                                lock);
 711                 else if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED))
 712                         ldlm_resource_add_lock(res, res->lr_waiting.prev, lock);
 713                 else
 714                         ldlm_grant_lock(res, lock);
 715         } else {
 716                 list_add(&lock->l_res_link, res->lr_converting.prev);
 717         }
 718
 719         spin_unlock(&res->lr_lock);
 720
 721         RETURN(res);
 722 }
 723
 724 void ldlm_lock_dump(struct ldlm_lock *lock)
 725 {
 726         char ver[128];
 727
 728         if (!(portal_debug & D_OTHER))
 729                 return;
 730
 731         if (RES_VERSION_SIZE != 4)
 732                 LBUG();
 733
 734         if (!lock) {
 735                 CDEBUG(D_OTHER, "  NULL LDLM lock\n");
 736                 return;
 737         }
 738
 739         snprintf(ver, sizeof(ver), "%x %x %x %x",
 740                  lock->l_version[0], lock->l_version[1],
 741                  lock->l_version[2], lock->l_version[3]);
 742
 743         CDEBUG(D_OTHER, "  -- Lock dump: %p (%s)\n", lock, ver);
 744         CDEBUG(D_OTHER, "  Parent: %p\n", lock->l_parent);
 745         CDEBUG(D_OTHER, "  Resource: %p (%Ld)\n", lock->l_resource,
 746                lock->l_resource->lr_name[0]);
 747         CDEBUG(D_OTHER, "  Requested mode: %d, granted mode: %d\n",
 748                (int)lock->l_req_mode, (int)lock->l_granted_mode);
 749         CDEBUG(D_OTHER, "  Readers: %u ; Writers; %u\n",
 750                lock->l_readers, lock->l_writers);
 751         if (lock->l_resource->lr_type == LDLM_EXTENT)
 752                 CDEBUG(D_OTHER, "  Extent: %Lu -> %Lu\n",
 753                        (unsigned long long)lock->l_extent.start,
 754                        (unsigned long long)lock->l_extent.end);
 755 }