lustre/ldlm/ldlm_lockd.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 #ifndef EXPORT_SYMTAB
  25 # define EXPORT_SYMTAB
  26 #endif
  27 #define DEBUG_SUBSYSTEM S_LDLM
  28
  29 #ifdef __KERNEL__
  30 # include <linux/module.h>
  31 # include <linux/slab.h>
  32 # include <linux/init.h>
  33 # include <linux/wait.h>
  34 #else
  35 # include <liblustre.h>
  36 #endif
  37
  38 #include <linux/lustre_dlm.h>
  39 #include <linux/obd_class.h>
  40 #include <libcfs/list.h>
  41 #include "ldlm_internal.h"
  42
  43 extern kmem_cache_t *ldlm_resource_slab;
  44 extern kmem_cache_t *ldlm_lock_slab;
  45 extern struct lustre_lock ldlm_handle_lock;
  46 extern struct list_head ldlm_namespace_list;
  47
  48 static DECLARE_MUTEX(ldlm_ref_sem);
  49 static int ldlm_refcount;
  50 /* LDLM state */
  51
  52 static struct ldlm_state *ldlm_state;
  53
  54 static inline unsigned long
  55 round_timeout(unsigned long timeout)
  56 {
  57         return ((timeout / HZ) + 1) * HZ;
  58 }
  59
  60 #ifdef __KERNEL__
  61 /* XXX should this be per-ldlm? */
  62 static struct list_head waiting_locks_list;
  63 static spinlock_t waiting_locks_spinlock;
  64 static struct timer_list waiting_locks_timer;
  65
  66 static struct expired_lock_thread {
  67         wait_queue_head_t         elt_waitq;
  68         int                       elt_state;
  69         struct list_head          elt_expired_locks;
  70         spinlock_t                elt_lock;
  71 } expired_lock_thread;
  72 #endif
  73
  74 #if !defined(ENOTSUPP)
  75 #  define ENOTSUPP 524
  76 #endif
  77
  78 #define ELT_STOPPED   0
  79 #define ELT_READY     1
  80 #define ELT_TERMINATE 2
  81
  82 struct ldlm_bl_pool {
  83         spinlock_t              blp_lock;
  84         struct list_head        blp_list;
  85         wait_queue_head_t       blp_waitq;
  86         atomic_t                blp_num_threads;
  87         struct completion       blp_comp;
  88 };
  89
  90 struct ldlm_bl_work_item {
  91         struct list_head        blwi_entry;
  92         struct ldlm_namespace   *blwi_ns;
  93         struct ldlm_lock_desc   blwi_ld;
  94         struct ldlm_lock        *blwi_lock;
  95 };
  96
  97 #ifdef __KERNEL__
  98
  99 static int ldlm_add_waiting_lock(struct ldlm_lock *lock);
 100
 101 static inline int have_expired_locks(void)
 102 {
 103         int need_to_run;
 104
 105         spin_lock_bh(&expired_lock_thread.elt_lock);
 106         need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
 107         spin_unlock_bh(&expired_lock_thread.elt_lock);
 108
 109         RETURN(need_to_run);
 110 }
 111
 112 static int expired_lock_main(void *arg)
 113 {
 114         struct list_head *expired = &expired_lock_thread.elt_expired_locks;
 115         struct l_wait_info lwi = { 0 };
 116         unsigned long flags;
 117
 118         ENTRY;
 119         lock_kernel();
 120         kportal_daemonize("ldlm_elt");
 121
 122         SIGNAL_MASK_LOCK(current, flags);
 123         sigfillset(&current->blocked);
 124         RECALC_SIGPENDING;
 125         SIGNAL_MASK_UNLOCK(current, flags);
 126
 127         unlock_kernel();
 128
 129         expired_lock_thread.elt_state = ELT_READY;
 130         wake_up(&expired_lock_thread.elt_waitq);
 131
 132         while (1) {
 133                 l_wait_event(expired_lock_thread.elt_waitq,
 134                              have_expired_locks() ||
 135                              expired_lock_thread.elt_state == ELT_TERMINATE,
 136                              &lwi);
 137
 138                 spin_lock_bh(&expired_lock_thread.elt_lock);
 139                 while (!list_empty(expired)) {
 140                         struct obd_export *export;
 141                         struct ldlm_lock *lock;
 142
 143                         lock = list_entry(expired->next, struct ldlm_lock,
 144                                           l_pending_chain);
 145                         if ((void *)lock < LP_POISON + PAGE_SIZE &&
 146                             (void *)lock >= LP_POISON) {
 147                                 CERROR("free lock on elt list %p\n", lock);
 148                                 LBUG();
 149                         }
 150                         list_del_init(&lock->l_pending_chain);
 151                         if ((void *)lock->l_export < LP_POISON + PAGE_SIZE &&
 152                             (void *)lock->l_export >= LP_POISON + PAGE_SIZE) {
 153                                 CERROR("lock with free export on elt list %p\n",
 154                                        export);
 155                                 lock->l_export = NULL;
 156                                 LDLM_ERROR(lock, "free export\n");
 157                                 continue;
 158                         }
 159                         export = class_export_get(lock->l_export);
 160                         spin_unlock_bh(&expired_lock_thread.elt_lock);
 161
 162                         ptlrpc_fail_export(export);
 163                         class_export_put(export);
 164                         spin_lock_bh(&expired_lock_thread.elt_lock);
 165                 }
 166                 spin_unlock_bh(&expired_lock_thread.elt_lock);
 167
 168                 if (expired_lock_thread.elt_state == ELT_TERMINATE)
 169                         break;
 170         }
 171
 172         expired_lock_thread.elt_state = ELT_STOPPED;
 173         wake_up(&expired_lock_thread.elt_waitq);
 174         RETURN(0);
 175 }
 176
 177 static void waiting_locks_callback(unsigned long unused)
 178 {
 179         struct ldlm_lock *lock;
 180         char str[PTL_NALFMT_SIZE];
 181
 182         if (obd_dump_on_timeout)
 183                 portals_debug_dumplog();
 184
 185 repeat:
 186         spin_lock_bh(&waiting_locks_spinlock);
 187         while (!list_empty(&waiting_locks_list)) {
 188                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 189                                   l_pending_chain);
 190
 191                 if ((lock->l_callback_timeout > jiffies) ||
 192                     (lock->l_req_mode == LCK_GROUP))
 193                         break;
 194
 195                 if (ptlrpc_check_suspend()) {
 196                         /* there is a case when we talk to one mds, holding
 197                          * lock from another mds. this way we easily can get
 198                          * here, if second mds is being recovered. so, we
 199                          * suspend timeouts. bug 6019 */
 200
 201                         LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ",
 202                                    lock->l_export->exp_client_uuid.uuid,
 203                                    lock->l_export->exp_connection->c_remote_uuid.uuid,
 204                                    ptlrpc_peernid2str(&lock->l_export->exp_connection->c_peer, str));
 205
 206                         list_del_init(&lock->l_pending_chain);
 207                         spin_unlock_bh(&waiting_locks_spinlock);
 208                         ldlm_add_waiting_lock(lock);
 209
 210                         goto repeat;
 211                 }
 212
 213                 LDLM_ERROR(lock, "lock callback timer expired: evicting client "
 214                            "%s@%s nid %s ",
 215                            lock->l_export->exp_client_uuid.uuid,
 216                            lock->l_export->exp_connection->c_remote_uuid.uuid,
 217                            ptlrpc_peernid2str(&lock->l_export->exp_connection->c_peer, str));
 218
 219                 spin_lock_bh(&expired_lock_thread.elt_lock);
 220                 list_del(&lock->l_pending_chain);
 221                 list_add(&lock->l_pending_chain,
 222                          &expired_lock_thread.elt_expired_locks);
 223                 spin_unlock_bh(&expired_lock_thread.elt_lock);
 224                 wake_up(&expired_lock_thread.elt_waitq);
 225         }
 226
 227         /*
 228          * Make sure the timer will fire again if we have any locks
 229          * left.
 230          */
 231         if (!list_empty(&waiting_locks_list)) {
 232                 unsigned long timeout_rounded;
 233                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 234                                   l_pending_chain);
 235                 timeout_rounded = round_timeout(lock->l_callback_timeout);
 236                 mod_timer(&waiting_locks_timer, timeout_rounded);
 237         }
 238         spin_unlock_bh(&waiting_locks_spinlock);
 239 }
 240
 241 /*
 242  * Indicate that we're waiting for a client to call us back cancelling a given
 243  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
 244  * timer to fire appropriately.  (We round up to the next second, to avoid
 245  * floods of timer firings during periods of high lock contention and traffic).
 246  */
 247 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 248 {
 249         unsigned long timeout_rounded;
 250
 251         spin_lock_bh(&waiting_locks_spinlock);
 252         if (!list_empty(&lock->l_pending_chain)) {
 253                 LDLM_DEBUG(lock, "not re-adding to wait list");
 254                 spin_unlock_bh(&waiting_locks_spinlock);
 255                 return 0;
 256         }
 257         LDLM_DEBUG(lock, "adding to wait list");
 258
 259         lock->l_callback_timeout = jiffies + (obd_timeout * HZ / 2);
 260
 261         timeout_rounded = round_timeout(lock->l_callback_timeout);
 262
 263         if (timeout_rounded < waiting_locks_timer.expires ||
 264             !timer_pending(&waiting_locks_timer)) {
 265                 mod_timer(&waiting_locks_timer, timeout_rounded);
 266         }
 267         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
 268         spin_unlock_bh(&waiting_locks_spinlock);
 269         return 1;
 270 }
 271
 272 /*
 273  * Remove a lock from the pending list, likely because it had its cancellation
 274  * callback arrive without incident.  This adjusts the lock-timeout timer if
 275  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
 276  */
 277 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 278 {
 279         struct list_head *list_next;
 280
 281         if (lock->l_export == NULL) {
 282                 /* We don't have a "waiting locks list" on clients. */
 283                 LDLM_DEBUG(lock, "client lock: no-op");
 284                 return 0;
 285         }
 286
 287         spin_lock_bh(&waiting_locks_spinlock);
 288
 289         if (list_empty(&lock->l_pending_chain)) {
 290                 spin_unlock_bh(&waiting_locks_spinlock);
 291                 LDLM_DEBUG(lock, "wasn't waiting");
 292                 return 0;
 293         }
 294
 295         list_next = lock->l_pending_chain.next;
 296         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 297                 /* Removing the head of the list, adjust timer. */
 298                 if (list_next == &waiting_locks_list) {
 299                         /* No more, just cancel. */
 300                         del_timer(&waiting_locks_timer);
 301                 } else {
 302                         struct ldlm_lock *next;
 303                         next = list_entry(list_next, struct ldlm_lock,
 304                                           l_pending_chain);
 305                         mod_timer(&waiting_locks_timer,
 306                                   round_timeout(next->l_callback_timeout));
 307                 }
 308         }
 309
 310         spin_lock_bh(&expired_lock_thread.elt_lock);
 311         list_del_init(&lock->l_pending_chain);
 312         spin_unlock_bh(&expired_lock_thread.elt_lock);
 313
 314         spin_unlock_bh(&waiting_locks_spinlock);
 315         LDLM_DEBUG(lock, "removed");
 316         return 1;
 317 }
 318
 319 #else /* !__KERNEL__ */
 320
 321 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 322 {
 323         RETURN(1);
 324 }
 325
 326 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 327 {
 328         RETURN(0);
 329 }
 330
 331 #endif /* __KERNEL__ */
 332
 333 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,const char *ast_type)
 334 {
 335         struct ptlrpc_connection *conn = lock->l_export->exp_connection;
 336         char str[PTL_NALFMT_SIZE];
 337
 338         LDLM_ERROR(lock, "%s AST failed (%d): evicting client %s@%s NID "LPX64
 339                    " (%s)", ast_type, rc, lock->l_export->exp_client_uuid.uuid,
 340                    conn->c_remote_uuid.uuid, conn->c_peer.peer_id.nid,
 341                    ptlrpc_peernid2str(&conn->c_peer, str));
 342
 343         if (obd_dump_on_timeout)
 344                 portals_debug_dumplog();
 345         ptlrpc_fail_export(lock->l_export);
 346 }
 347
 348 static int ldlm_handle_ast_error(struct ldlm_lock *lock,
 349                                  struct ptlrpc_request *req, int rc,
 350                                  const char *ast_type)
 351 {
 352         struct ptlrpc_peer *peer = &req->rq_import->imp_connection->c_peer;
 353         char str[PTL_NALFMT_SIZE];
 354
 355         if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) {
 356                 LASSERT(lock->l_export);
 357                 if (lock->l_export->exp_libclient) {
 358                         LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)"
 359                                    " timeout, just cancelling lock", ast_type,
 360                                    ptlrpc_peernid2str(peer, str));
 361                         ldlm_lock_cancel(lock);
 362                         rc = -ERESTART;
 363                 } else {
 364                         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 365                         ldlm_del_waiting_lock(lock);
 366                         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 367                         ldlm_failed_ast(lock, rc, ast_type);
 368                 }
 369         } else if (rc) {
 370                 if (rc == -EINVAL)
 371                         LDLM_DEBUG(lock, "client (nid %s) returned %d"
 372                                    " from %s AST - normal race",
 373                                    ptlrpc_peernid2str(peer, str),
 374                                    req->rq_repmsg->status, ast_type);
 375                 else
 376                         LDLM_ERROR(lock, "client (nid %s) returned %d "
 377                                    "from %s AST", ptlrpc_peernid2str(peer, str),
 378                                    (req->rq_repmsg != NULL) ?
 379                                    req->rq_repmsg->status : 0, ast_type);
 380                 ldlm_lock_cancel(lock);
 381                 /* Server-side AST functions are called from ldlm_reprocess_all,
 382                  * which needs to be told to please restart its reprocessing. */
 383                 rc = -ERESTART;
 384         }
 385
 386         return rc;
 387 }
 388
 389 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 390                              struct ldlm_lock_desc *desc,
 391                              void *data, int flag)
 392 {
 393         struct ldlm_request *body;
 394         struct ptlrpc_request *req;
 395         int rc = 0, size = sizeof(*body);
 396         ENTRY;
 397
 398         if (flag == LDLM_CB_CANCELING) {
 399                 /* Don't need to do anything here. */
 400                 RETURN(0);
 401         }
 402
 403         LASSERTF(lock->l_export->exp_obd->obd_recovering == 0,
 404                  "BUG 6063: lock collide during recovery");
 405
 406         LASSERT(lock);
 407
 408         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 409         if (lock->l_granted_mode != lock->l_req_mode) {
 410                 /* this blocking AST will be communicated as part of the
 411                  * completion AST instead */
 412                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
 413                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 414                 RETURN(0);
 415         }
 416
 417         if (lock->l_destroyed) {
 418                 /* What's the point? */
 419                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 420                 RETURN(0);
 421         }
 422
 423 #if 0
 424         if (LTIME_S(CURRENT_TIME) - lock->l_export->exp_last_request_time > 30){
 425                 ldlm_failed_ast(lock, -ETIMEDOUT, "Not-attempted blocking");
 426                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 427                 RETURN(-ETIMEDOUT);
 428         }
 429 #endif
 430
 431         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 432                               LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK,
 433                               1, &size, NULL);
 434         if (req == NULL) {
 435                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 436                 RETURN(-ENOMEM);
 437         }
 438
 439         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 440         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 441                sizeof(body->lock_handle1));
 442         memcpy(&body->lock_desc, desc, sizeof(*desc));
 443         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
 444
 445         LDLM_DEBUG(lock, "server preparing blocking AST");
 446         req->rq_replen = lustre_msg_size(0, NULL);
 447
 448         if (lock->l_granted_mode == lock->l_req_mode)
 449                 ldlm_add_waiting_lock(lock);
 450         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 451
 452         req->rq_send_state = LUSTRE_IMP_FULL;
 453         req->rq_timeout = ldlm_timeout; /* timeout for initial AST reply */
 454         rc = ptlrpc_queue_wait(req);
 455         if (rc != 0)
 456                 rc = ldlm_handle_ast_error(lock, req, rc, "blocking");
 457
 458         ptlrpc_req_finished(req);
 459
 460         RETURN(rc);
 461 }
 462
 463 /* XXX copied from ptlrpc/service.c */
 464 static long timeval_sub(struct timeval *large, struct timeval *small)
 465 {
 466         return (large->tv_sec - small->tv_sec) * 1000000 +
 467                 (large->tv_usec - small->tv_usec);
 468 }
 469
 470 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
 471 {
 472         struct ldlm_request *body;
 473         struct ptlrpc_request *req;
 474         struct timeval granted_time;
 475         long total_enqueue_wait;
 476         int rc = 0, size[2] = {sizeof(*body)}, buffers = 1;
 477         ENTRY;
 478
 479         LASSERT(lock != NULL);
 480
 481         do_gettimeofday(&granted_time);
 482         total_enqueue_wait = timeval_sub(&granted_time, &lock->l_enqueued_time);
 483
 484         if (total_enqueue_wait / 1000000 > obd_timeout)
 485                 LDLM_ERROR(lock, "enqueue wait took %ldus", total_enqueue_wait);
 486
 487         down(&lock->l_resource->lr_lvb_sem);
 488         if (lock->l_resource->lr_lvb_len) {
 489                 buffers = 2;
 490                 size[1] = lock->l_resource->lr_lvb_len;
 491         }
 492         up(&lock->l_resource->lr_lvb_sem);
 493
 494         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 495                               LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK,
 496                               buffers, size, NULL);
 497         if (req == NULL)
 498                 RETURN(-ENOMEM);
 499
 500         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 501         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 502                sizeof(body->lock_handle1));
 503         body->lock_flags = flags;
 504         ldlm_lock2desc(lock, &body->lock_desc);
 505
 506         if (buffers == 2) {
 507                 void *lvb;
 508
 509                 down(&lock->l_resource->lr_lvb_sem);
 510                 lvb = lustre_msg_buf(req->rq_reqmsg, 1,
 511                                      lock->l_resource->lr_lvb_len);
 512
 513                 memcpy(lvb, lock->l_resource->lr_lvb_data,
 514                        lock->l_resource->lr_lvb_len);
 515                 up(&lock->l_resource->lr_lvb_sem);
 516         }
 517
 518         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
 519                    total_enqueue_wait);
 520         req->rq_replen = lustre_msg_size(0, NULL);
 521
 522         req->rq_send_state = LUSTRE_IMP_FULL;
 523         req->rq_timeout = ldlm_timeout; /* timeout for initial AST reply */
 524
 525         /* We only send real blocking ASTs after the lock is granted */
 526         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 527         if (lock->l_flags & LDLM_FL_AST_SENT) {
 528                 body->lock_flags |= LDLM_FL_AST_SENT;
 529                 ldlm_add_waiting_lock(lock); /* start the lock-timeout clock */
 530         }
 531         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 532
 533         rc = ptlrpc_queue_wait(req);
 534         if (rc != 0)
 535                 rc = ldlm_handle_ast_error(lock, req, rc, "completion");
 536
 537         ptlrpc_req_finished(req);
 538
 539         RETURN(rc);
 540 }
 541
 542 int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
 543 {
 544         struct ldlm_resource *res = lock->l_resource;
 545         struct ldlm_request *body;
 546         struct ptlrpc_request *req;
 547         int rc = 0, size = sizeof(*body);
 548         ENTRY;
 549
 550         LASSERT(lock != NULL);
 551
 552         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 553                               LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK,
 554                               1, &size, NULL);
 555         if (req == NULL)
 556                 RETURN(-ENOMEM);
 557
 558         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 559         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 560                sizeof(body->lock_handle1));
 561         ldlm_lock2desc(lock, &body->lock_desc);
 562
 563         down(&lock->l_resource->lr_lvb_sem);
 564         size = lock->l_resource->lr_lvb_len;
 565         up(&lock->l_resource->lr_lvb_sem);
 566         req->rq_replen = lustre_msg_size(1, &size);
 567
 568         req->rq_send_state = LUSTRE_IMP_FULL;
 569         req->rq_timeout = 2; /* 2 second timeout for initial AST reply */
 570
 571         rc = ptlrpc_queue_wait(req);
 572         if (rc == -ELDLM_NO_LOCK_DATA)
 573                 LDLM_DEBUG(lock, "lost race - client has a lock but no inode");
 574         else if (rc != 0)
 575                 rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
 576         else
 577                 rc = res->lr_namespace->ns_lvbo->lvbo_update
 578                         (res, req->rq_repmsg, 0, 1);
 579         ptlrpc_req_finished(req);
 580         RETURN(rc);
 581 }
 582
 583 static struct ldlm_lock *
 584 find_existing_lock(struct obd_export *exp, struct lustre_handle *remote_hdl)
 585 {
 586         struct obd_device *obd = exp->exp_obd;
 587         struct list_head *iter;
 588
 589         l_lock(&obd->obd_namespace->ns_lock);
 590         list_for_each(iter, &exp->exp_ldlm_data.led_held_locks) {
 591                 struct ldlm_lock *lock;
 592                 lock = list_entry(iter, struct ldlm_lock, l_export_chain);
 593                 if (lock->l_remote_handle.cookie == remote_hdl->cookie) {
 594                         LDLM_LOCK_GET(lock);
 595                         l_unlock(&obd->obd_namespace->ns_lock);
 596                         return lock;
 597                 }
 598         }
 599         l_unlock(&obd->obd_namespace->ns_lock);
 600         return NULL;
 601 }
 602
 603
 604 int ldlm_handle_enqueue(struct ptlrpc_request *req,
 605                         ldlm_completion_callback completion_callback,
 606                         ldlm_blocking_callback blocking_callback,
 607                         ldlm_glimpse_callback glimpse_callback)
 608 {
 609         struct obd_device *obddev = req->rq_export->exp_obd;
 610         struct ldlm_reply *dlm_rep;
 611         struct ldlm_request *dlm_req;
 612         int rc = 0, size[2] = {sizeof(*dlm_rep)};
 613         __u32 flags;
 614         ldlm_error_t err = ELDLM_OK;
 615         struct ldlm_lock *lock = NULL;
 616         void *cookie = NULL;
 617         ENTRY;
 618
 619         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 620
 621         dlm_req = lustre_swab_reqbuf (req, MDS_REQ_INTENT_LOCKREQ_OFF,
 622                                       sizeof (*dlm_req),
 623                                       lustre_swab_ldlm_request);
 624         if (dlm_req == NULL) {
 625                 CERROR ("Can't unpack dlm_req\n");
 626                 GOTO(out, rc = -EFAULT);
 627         }
 628
 629         flags = dlm_req->lock_flags;
 630
 631         LASSERT(req->rq_export);
 632
 633         if (flags & LDLM_FL_REPLAY) {
 634                 lock = find_existing_lock(req->rq_export,
 635                                           &dlm_req->lock_handle1);
 636                 if (lock != NULL) {
 637                         DEBUG_REQ(D_HA, req, "found existing lock cookie "LPX64,
 638                                   lock->l_handle.h_cookie);
 639                         GOTO(existing_lock, rc = 0);
 640                 }
 641         }
 642
 643         /* The lock's callback data might be set in the policy function */
 644         lock = ldlm_lock_create(obddev->obd_namespace, &dlm_req->lock_handle2,
 645                                 dlm_req->lock_desc.l_resource.lr_name,
 646                                 dlm_req->lock_desc.l_resource.lr_type,
 647                                 dlm_req->lock_desc.l_req_mode,
 648                                 blocking_callback, completion_callback,
 649                                 glimpse_callback, NULL, 0);
 650         if (!lock)
 651                 GOTO(out, rc = -ENOMEM);
 652
 653         do_gettimeofday(&lock->l_enqueued_time);
 654         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 655                sizeof(lock->l_remote_handle));
 656         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 657
 658         LASSERT(req->rq_export);
 659         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
 660         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 661         if (req->rq_export->exp_failed) {
 662                 LDLM_ERROR(lock,"lock on destroyed export %p\n",req->rq_export);
 663                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 664                 GOTO(out, err = -ENOTCONN);
 665         }
 666         lock->l_export = class_export_get(req->rq_export);
 667
 668         list_add(&lock->l_export_chain,
 669                  &lock->l_export->exp_ldlm_data.led_held_locks);
 670         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 671
 672 existing_lock:
 673
 674         if (flags & LDLM_FL_HAS_INTENT) {
 675                 /* In this case, the reply buffer is allocated deep in
 676                  * local_lock_enqueue by the policy function. */
 677                 cookie = req;
 678         } else {
 679                 int buffers = 1;
 680                 down(&lock->l_resource->lr_lvb_sem);
 681                 if (lock->l_resource->lr_lvb_len) {
 682                         size[1] = lock->l_resource->lr_lvb_len;
 683                         buffers = 2;
 684                 }
 685                 up(&lock->l_resource->lr_lvb_sem);
 686                 if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
 687                         GOTO(out, rc = -ENOMEM);
 688
 689                 rc = lustre_pack_reply(req, buffers, size, NULL);
 690                 if (rc)
 691                         GOTO(out, rc);
 692         }
 693
 694         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN)
 695                 memcpy(&lock->l_policy_data, &dlm_req->lock_desc.l_policy_data,
 696                        sizeof(ldlm_policy_data_t));
 697         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT)
 698                 memcpy(&lock->l_req_extent, &lock->l_policy_data.l_extent,
 699                        sizeof(lock->l_req_extent));
 700
 701         err = ldlm_lock_enqueue(obddev->obd_namespace, &lock,
 702                                 cookie, (int *)&flags);
 703         if (err)
 704                 GOTO(out, err);
 705
 706         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*dlm_rep));
 707         dlm_rep->lock_flags = flags;
 708
 709         ldlm_lock2desc(lock, &dlm_rep->lock_desc);
 710         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 711
 712         /* We never send a blocking AST until the lock is granted, but
 713          * we can tell it right now */
 714         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 715         if (lock->l_flags & LDLM_FL_AST_SENT) {
 716                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
 717                 if (lock->l_granted_mode == lock->l_req_mode)
 718                         ldlm_add_waiting_lock(lock);
 719         }
 720         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 721
 722         EXIT;
 723  out:
 724         req->rq_status = err;
 725         if (req->rq_reply_state == NULL) {
 726                 err = lustre_pack_reply(req, 0, NULL, NULL);
 727                 if (rc == 0)
 728                         rc = err;
 729                 req->rq_status = rc;
 730         }
 731
 732         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
 733          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
 734         if (lock) {
 735                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 736                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 737                            "(err=%d, rc=%d)", err, rc);
 738                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 739
 740                 if (rc == 0) {
 741                         down(&lock->l_resource->lr_lvb_sem);
 742                         size[1] = lock->l_resource->lr_lvb_len;
 743                         if (size[1] > 0) {
 744                                 void *lvb = lustre_msg_buf(req->rq_repmsg,
 745                                                            1, size[1]);
 746                                 LASSERTF(lvb != NULL, "req %p, lock %p\n",
 747                                          req, lock);
 748
 749                                 memcpy(lvb, lock->l_resource->lr_lvb_data,
 750                                        size[1]);
 751                         }
 752                         up(&lock->l_resource->lr_lvb_sem);
 753                 } else {
 754                         ldlm_lock_destroy(lock);
 755                 }
 756
 757                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
 758                         ldlm_reprocess_all(lock->l_resource);
 759                 LDLM_LOCK_PUT(lock);
 760         }
 761         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
 762                           lock, rc);
 763
 764         return rc;
 765 }
 766
 767 int ldlm_handle_convert(struct ptlrpc_request *req)
 768 {
 769         struct ldlm_request *dlm_req;
 770         struct ldlm_reply *dlm_rep;
 771         struct ldlm_lock *lock;
 772         int rc, size = sizeof(*dlm_rep);
 773         ENTRY;
 774
 775         dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
 776                                      lustre_swab_ldlm_request);
 777         if (dlm_req == NULL) {
 778                 CERROR ("Can't unpack dlm_req\n");
 779                 RETURN (-EFAULT);
 780         }
 781
 782         rc = lustre_pack_reply(req, 1, &size, NULL);
 783         if (rc) {
 784                 CERROR("out of memory\n");
 785                 RETURN(-ENOMEM);
 786         }
 787         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*dlm_rep));
 788         dlm_rep->lock_flags = dlm_req->lock_flags;
 789
 790         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 791         if (!lock) {
 792                 req->rq_status = EINVAL;
 793         } else {
 794                 void *res = NULL;
 795
 796                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 797                 LDLM_DEBUG(lock, "server-side convert handler START");
 798                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 799
 800                 res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 801                                         (int *)&dlm_rep->lock_flags);
 802                 if (res) {
 803                         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 804                         if (ldlm_del_waiting_lock(lock))
 805                                 CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 806                         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 807                         req->rq_status = 0;
 808                 } else {
 809                         req->rq_status = EDEADLOCK;
 810                 }
 811         }
 812
 813         if (lock) {
 814                 if (!req->rq_status)
 815                         ldlm_reprocess_all(lock->l_resource);
 816                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 817                 LDLM_DEBUG(lock, "server-side convert handler END");
 818                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 819                 LDLM_LOCK_PUT(lock);
 820         } else
 821                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 822
 823         RETURN(0);
 824 }
 825
 826 int ldlm_handle_cancel(struct ptlrpc_request *req)
 827 {
 828         struct ldlm_request *dlm_req;
 829         struct ldlm_lock *lock;
 830         struct ldlm_resource *res;
 831         int rc;
 832         ENTRY;
 833
 834         dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
 835                                       lustre_swab_ldlm_request);
 836         if (dlm_req == NULL) {
 837                 CERROR("bad request buffer for cancel\n");
 838                 RETURN(-EFAULT);
 839         }
 840
 841         rc = lustre_pack_reply(req, 0, NULL, NULL);
 842         if (rc) {
 843                 CERROR("out of memory\n");
 844                 RETURN(-ENOMEM);
 845         }
 846
 847         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 848         if (!lock) {
 849                 CERROR("received cancel for unknown lock cookie "LPX64
 850                        " from client %s id %s\n",
 851                        dlm_req->lock_handle1.cookie,
 852                        req->rq_export->exp_client_uuid.uuid,
 853                        req->rq_peerstr);
 854                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock "
 855                                   "(cookie "LPU64")",
 856                                   dlm_req->lock_handle1.cookie);
 857                 req->rq_status = ESTALE;
 858         } else {
 859                 LDLM_DEBUG(lock, "server-side cancel handler START");
 860                 res = lock->l_resource;
 861                 if (res && res->lr_namespace->ns_lvbo &&
 862                     res->lr_namespace->ns_lvbo->lvbo_update) {
 863                         (void)res->lr_namespace->ns_lvbo->lvbo_update
 864                                 (res, NULL, 0, 0);
 865                                 //(res, req->rq_reqmsg, 1);
 866                 }
 867
 868                 l_lock(&res->lr_namespace->ns_lock);
 869                 ldlm_lock_cancel(lock);
 870                 if (ldlm_del_waiting_lock(lock))
 871                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 872                 l_unlock(&res->lr_namespace->ns_lock);
 873                 req->rq_status = rc;
 874         }
 875
 876         if (ptlrpc_reply(req) != 0)
 877                 LBUG();
 878
 879         if (lock) {
 880                 ldlm_reprocess_all(lock->l_resource);
 881                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 882                 LDLM_DEBUG(lock, "server-side cancel handler END");
 883                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 884                 LDLM_LOCK_PUT(lock);
 885         }
 886
 887         RETURN(0);
 888 }
 889
 890 void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
 891                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
 892 {
 893         int do_ast;
 894         ENTRY;
 895
 896         l_lock(&ns->ns_lock);
 897         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 898
 899         lock->l_flags |= LDLM_FL_CBPENDING;
 900         do_ast = (!lock->l_readers && !lock->l_writers);
 901
 902         if (do_ast) {
 903                 LDLM_DEBUG(lock, "already unused, calling "
 904                            "callback (%p)", lock->l_blocking_ast);
 905                 if (lock->l_blocking_ast != NULL) {
 906                         l_unlock(&ns->ns_lock);
 907                         l_check_no_ns_lock(ns);
 908                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
 909                                              LDLM_CB_BLOCKING);
 910                         l_lock(&ns->ns_lock);
 911                 }
 912         } else {
 913                 LDLM_DEBUG(lock, "Lock still has references, will be"
 914                            " cancelled later");
 915         }
 916
 917         LDLM_DEBUG(lock, "client blocking callback handler END");
 918         l_unlock(&ns->ns_lock);
 919         LDLM_LOCK_PUT(lock);
 920         EXIT;
 921 }
 922
 923 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
 924                                     struct ldlm_namespace *ns,
 925                                     struct ldlm_request *dlm_req,
 926                                     struct ldlm_lock *lock)
 927 {
 928         LIST_HEAD(ast_list);
 929         ENTRY;
 930
 931         l_lock(&ns->ns_lock);
 932         LDLM_DEBUG(lock, "client completion callback handler START");
 933
 934         /* If we receive the completion AST before the actual enqueue returned,
 935          * then we might need to switch lock modes, resources, or extents. */
 936         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 937                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 938                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 939         }
 940
 941         if (lock->l_resource->lr_type != LDLM_PLAIN) {
 942                 memcpy(&lock->l_policy_data, &dlm_req->lock_desc.l_policy_data,
 943                        sizeof(lock->l_policy_data));
 944                 LDLM_DEBUG(lock, "completion AST, new policy data");
 945         }
 946
 947         ldlm_resource_unlink_lock(lock);
 948         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
 949                    &lock->l_resource->lr_name,
 950                    sizeof(lock->l_resource->lr_name)) != 0) {
 951                 ldlm_lock_change_resource(ns, lock,
 952                                          dlm_req->lock_desc.l_resource.lr_name);
 953                 LDLM_DEBUG(lock, "completion AST, new resource");
 954         }
 955
 956         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
 957                 lock->l_flags |= LDLM_FL_CBPENDING;
 958                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
 959         }
 960
 961         if (lock->l_lvb_len) {
 962                 void *lvb;
 963                 lvb = lustre_swab_reqbuf(req, 1, lock->l_lvb_len,
 964                                          lock->l_lvb_swabber);
 965                 if (lvb == NULL) {
 966                         LDLM_ERROR(lock, "completion AST did not contain "
 967                                    "expected LVB!");
 968                 } else {
 969                         memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len);
 970                 }
 971         }
 972
 973         lock->l_resource->lr_tmp = &ast_list;
 974         ldlm_grant_lock(lock, req, sizeof(*req), 1);
 975         lock->l_resource->lr_tmp = NULL;
 976         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 977         l_unlock(&ns->ns_lock);
 978         LDLM_LOCK_PUT(lock);
 979
 980         ldlm_run_ast_work(ns, &ast_list);
 981
 982         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 983                           lock);
 984         EXIT;
 985 }
 986
 987 static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
 988                                     struct ldlm_namespace *ns,
 989                                     struct ldlm_request *dlm_req,
 990                                     struct ldlm_lock *lock)
 991 {
 992         int rc = -ENOSYS;
 993         ENTRY;
 994
 995         l_lock(&ns->ns_lock);
 996         LDLM_DEBUG(lock, "client glimpse AST callback handler");
 997
 998         if (lock->l_glimpse_ast != NULL) {
 999                 l_unlock(&ns->ns_lock);
1000                 l_check_no_ns_lock(ns);
1001                 rc = lock->l_glimpse_ast(lock, req);
1002                 l_lock(&ns->ns_lock);
1003         }
1004
1005         if (req->rq_repmsg != NULL) {
1006                 ptlrpc_reply(req);
1007         } else {
1008                 req->rq_status = rc;
1009                 ptlrpc_error(req);
1010         }
1011
1012         l_unlock(&ns->ns_lock);
1013         if (lock->l_granted_mode == LCK_PW &&
1014             !lock->l_readers && !lock->l_writers &&
1015             time_after(jiffies, lock->l_last_used + 10 * HZ)) {
1016                 if (ldlm_bl_to_thread(ns, NULL, lock))
1017                         ldlm_handle_bl_callback(ns, NULL, lock);
1018
1019                 EXIT;
1020                 return;
1021         }
1022         LDLM_LOCK_PUT(lock);
1023         EXIT;
1024 }
1025
1026 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
1027 {
1028         req->rq_status = rc;
1029         if (req->rq_reply_state == NULL) {
1030                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1031                 if (rc)
1032                         return rc;
1033         }
1034         return ptlrpc_reply(req);
1035 }
1036
1037 int ldlm_bl_to_thread(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
1038                       struct ldlm_lock *lock)
1039 {
1040 #ifdef __KERNEL__
1041         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1042         struct ldlm_bl_work_item *blwi;
1043         ENTRY;
1044
1045         OBD_ALLOC(blwi, sizeof(*blwi));
1046         if (blwi == NULL)
1047                 RETURN(-ENOMEM);
1048
1049         blwi->blwi_ns = ns;
1050         if (ld != NULL)
1051                 blwi->blwi_ld = *ld;
1052         blwi->blwi_lock = lock;
1053
1054         spin_lock(&blp->blp_lock);
1055         list_add_tail(&blwi->blwi_entry, &blp->blp_list);
1056         wake_up(&blp->blp_waitq);
1057         spin_unlock(&blp->blp_lock);
1058
1059         RETURN(0);
1060 #else
1061         RETURN(-ENOSYS);
1062 #endif
1063
1064 }
1065
1066 static int ldlm_msg_check_version(struct lustre_msg *msg)
1067 {
1068         int rc;
1069
1070         switch (msg->opc) {
1071         case LDLM_ENQUEUE:
1072         case LDLM_CONVERT:
1073         case LDLM_CANCEL:
1074         case LDLM_BL_CALLBACK:
1075         case LDLM_CP_CALLBACK:
1076         case LDLM_GL_CALLBACK:
1077                 rc = lustre_msg_check_version(msg, LUSTRE_DLM_VERSION);
1078                 if (rc)
1079                         CERROR("bad opc %u version %08x, expecting %08x\n",
1080                                msg->opc, msg->version, LUSTRE_DLM_VERSION);
1081                 break;
1082         case OBD_LOG_CANCEL:
1083         case LLOG_ORIGIN_HANDLE_OPEN:
1084         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1085         case LLOG_ORIGIN_HANDLE_PREV_BLOCK:
1086         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1087         case LLOG_ORIGIN_HANDLE_CLOSE:
1088         case LLOG_CATINFO:
1089                 rc = lustre_msg_check_version(msg, LUSTRE_LOG_VERSION);
1090                 if (rc)
1091                         CERROR("bad opc %u version %08x, expecting %08x\n",
1092                                msg->opc, msg->version, LUSTRE_LOG_VERSION);
1093                 break;
1094         default:
1095                 CERROR("LDLM unknown opcode %d\n", msg->opc);
1096                 rc = -ENOTSUPP;
1097                 break;
1098         }
1099
1100         return rc;
1101 }
1102
1103 static int ldlm_callback_handler(struct ptlrpc_request *req)
1104 {
1105         struct ldlm_namespace *ns;
1106         struct ldlm_request *dlm_req;
1107         struct ldlm_lock *lock;
1108         int rc;
1109         ENTRY;
1110
1111         rc = ldlm_msg_check_version(req->rq_reqmsg);
1112         if (rc) {
1113                 CERROR("LDLM_CB drop mal-formed request\n");
1114                 RETURN(rc);
1115         }
1116
1117         /* Requests arrive in sender's byte order.  The ptlrpc service
1118          * handler has already checked and, if necessary, byte-swapped the
1119          * incoming request message body, but I am responsible for the
1120          * message buffers. */
1121
1122         if (req->rq_export == NULL) {
1123                 struct ldlm_request *dlm_req;
1124
1125                 CDEBUG(D_RPCTRACE, "operation %d from %s with bad "
1126                        "export cookie "LPX64"; this is "
1127                        "normal if this node rebooted with a lock held\n",
1128                        req->rq_reqmsg->opc,
1129                        req->rq_peerstr,
1130                        req->rq_reqmsg->handle.cookie);
1131                 dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
1132                                              lustre_swab_ldlm_request);
1133                 if (dlm_req != NULL)
1134                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
1135                                dlm_req->lock_handle1.cookie);
1136
1137                 ldlm_callback_reply(req, -ENOTCONN);
1138                 RETURN(0);
1139         }
1140
1141         LASSERT(req->rq_export != NULL);
1142         LASSERT(req->rq_export->exp_obd != NULL);
1143
1144         switch(req->rq_reqmsg->opc) {
1145         case LDLM_BL_CALLBACK:
1146                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
1147                 break;
1148         case LDLM_CP_CALLBACK:
1149                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
1150                 break;
1151         case LDLM_GL_CALLBACK:
1152                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_GL_CALLBACK, 0);
1153                 break;
1154         case OBD_LOG_CANCEL:
1155                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
1156                 rc = llog_origin_handle_cancel(req);
1157                 ldlm_callback_reply(req, rc);
1158                 RETURN(0);
1159         case LLOG_ORIGIN_HANDLE_OPEN:
1160                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1161                 rc = llog_origin_handle_open(req);
1162                 ldlm_callback_reply(req, rc);
1163                 RETURN(0);
1164         case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
1165                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1166                 rc = llog_origin_handle_next_block(req);
1167                 ldlm_callback_reply(req, rc);
1168                 RETURN(0);
1169         case LLOG_ORIGIN_HANDLE_PREV_BLOCK:
1170                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1171                 rc = llog_origin_handle_prev_block(req);
1172                 ldlm_callback_reply(req, rc);
1173                 RETURN(0);
1174         case LLOG_ORIGIN_HANDLE_READ_HEADER:
1175                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1176                 rc = llog_origin_handle_read_header(req);
1177                 ldlm_callback_reply(req, rc);
1178                 RETURN(0);
1179         case LLOG_ORIGIN_HANDLE_CLOSE:
1180                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
1181                 rc = llog_origin_handle_close(req);
1182                 ldlm_callback_reply(req, rc);
1183                 RETURN(0);
1184         default:
1185                 CERROR("unknown opcode %u\n", req->rq_reqmsg->opc);
1186                 ldlm_callback_reply(req, -EPROTO);
1187                 RETURN(0);
1188         }
1189
1190         ns = req->rq_export->exp_obd->obd_namespace;
1191         LASSERT(ns != NULL);
1192
1193         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
1194                                       lustre_swab_ldlm_request);
1195         if (dlm_req == NULL) {
1196                 CERROR ("can't unpack dlm_req\n");
1197                 ldlm_callback_reply (req, -EPROTO);
1198                 RETURN (0);
1199         }
1200
1201         lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle1);
1202         if (!lock) {
1203                 LDLM_DEBUG_NOLOCK("callback on lock "LPX64" - lock "
1204                                   "disappeared\n",dlm_req->lock_handle1.cookie);
1205                 ldlm_callback_reply(req, -EINVAL);
1206                 RETURN(0);
1207         }
1208
1209         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
1210         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
1211
1212         /* We want the ost thread to get this reply so that it can respond
1213          * to ost requests (write cache writeback) that might be triggered
1214          * in the callback.
1215          *
1216          * But we'd also like to be able to indicate in the reply that we're
1217          * cancelling right now, because it's unused, or have an intent result
1218          * in the reply, so we might have to push the responsibility for sending
1219          * the reply down into the AST handlers, alas. */
1220
1221         switch (req->rq_reqmsg->opc) {
1222         case LDLM_BL_CALLBACK:
1223                 CDEBUG(D_INODE, "blocking ast\n");
1224                 ldlm_callback_reply(req, 0);
1225                 if (ldlm_bl_to_thread(ns, &dlm_req->lock_desc, lock))
1226                         ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
1227
1228                 break;
1229         case LDLM_CP_CALLBACK:
1230                 CDEBUG(D_INODE, "completion ast\n");
1231                 ldlm_callback_reply(req, 0);
1232                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
1233                 break;
1234         case LDLM_GL_CALLBACK:
1235                 CDEBUG(D_INODE, "glimpse ast\n");
1236                 ldlm_handle_gl_callback(req, ns, dlm_req, lock);
1237                 break;
1238         default:
1239                 LBUG();                         /* checked above */
1240         }
1241
1242         RETURN(0);
1243 }
1244
1245 static int ldlm_cancel_handler(struct ptlrpc_request *req)
1246 {
1247         int rc = 0;
1248         ENTRY;
1249
1250         rc = ldlm_msg_check_version(req->rq_reqmsg);
1251         if (rc) {
1252                 CERROR("LDLM_CL drop mal-formed request\n");
1253                 RETURN(rc);
1254         }
1255
1256         /* Requests arrive in sender's byte order.  The ptlrpc service
1257          * handler has already checked and, if necessary, byte-swapped the
1258          * incoming request message body, but I am responsible for the
1259          * message buffers. */
1260
1261         if (req->rq_export == NULL) {
1262                 struct ldlm_request *dlm_req;
1263                 CERROR("operation %d with bad export from %s\n",
1264                        req->rq_reqmsg->opc,
1265                        req->rq_peerstr);
1266                 CERROR("--> export cookie: "LPX64"\n",
1267                        req->rq_reqmsg->handle.cookie);
1268                 dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
1269                                              lustre_swab_ldlm_request);
1270                 if (dlm_req != NULL)
1271                         ldlm_lock_dump_handle(D_ERROR, &dlm_req->lock_handle1);
1272                 ldlm_callback_reply(req, -ENOTCONN);
1273                 RETURN(0);
1274         }
1275
1276         switch (req->rq_reqmsg->opc) {
1277
1278         /* XXX FIXME move this back to mds/handler.c, bug 249 */
1279         case LDLM_CANCEL:
1280                 CDEBUG(D_INODE, "cancel\n");
1281                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
1282                 rc = ldlm_handle_cancel(req);
1283                 break;
1284         default:
1285                 CERROR("invalid opcode %d\n", req->rq_reqmsg->opc);
1286                 ldlm_callback_reply(req, -EINVAL);
1287         }
1288
1289         RETURN(rc);
1290 }
1291
1292 #ifdef __KERNEL__
1293 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
1294 {
1295         struct ldlm_bl_work_item *blwi = NULL;
1296
1297         spin_lock(&blp->blp_lock);
1298         if (!list_empty(&blp->blp_list)) {
1299                 blwi = list_entry(blp->blp_list.next, struct ldlm_bl_work_item,
1300                                   blwi_entry);
1301                 list_del(&blwi->blwi_entry);
1302         }
1303         spin_unlock(&blp->blp_lock);
1304
1305         return blwi;
1306 }
1307
1308 struct ldlm_bl_thread_data {
1309         int                     bltd_num;
1310         struct ldlm_bl_pool     *bltd_blp;
1311 };
1312
1313 static int ldlm_bl_thread_main(void *arg)
1314 {
1315         struct ldlm_bl_thread_data *bltd = arg;
1316         struct ldlm_bl_pool *blp = bltd->bltd_blp;
1317         unsigned long flags;
1318         ENTRY;
1319
1320         /* XXX boiler-plate */
1321         {
1322                 char name[sizeof(current->comm)];
1323                 snprintf(name, sizeof(name) - 1, "ldlm_bl_%02d",
1324                          bltd->bltd_num);
1325                 kportal_daemonize(name);
1326         }
1327         SIGNAL_MASK_LOCK(current, flags);
1328         sigfillset(&current->blocked);
1329         RECALC_SIGPENDING;
1330         SIGNAL_MASK_UNLOCK(current, flags);
1331
1332         atomic_inc(&blp->blp_num_threads);
1333         complete(&blp->blp_comp);
1334
1335         while(1) {
1336                 struct l_wait_info lwi = { 0 };
1337                 struct ldlm_bl_work_item *blwi = NULL;
1338
1339                 l_wait_event_exclusive(blp->blp_waitq,
1340                                        (blwi = ldlm_bl_get_work(blp)) != NULL,
1341                                        &lwi);
1342
1343                 if (blwi->blwi_ns == NULL)
1344                         break;
1345
1346                 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1347                                         blwi->blwi_lock);
1348                 OBD_FREE(blwi, sizeof(*blwi));
1349         }
1350
1351         atomic_dec(&blp->blp_num_threads);
1352         complete(&blp->blp_comp);
1353         RETURN(0);
1354 }
1355
1356 #endif
1357
1358 static int ldlm_setup(void);
1359 static int ldlm_cleanup(int force);
1360
1361 int ldlm_get_ref(void)
1362 {
1363         int rc = 0;
1364         down(&ldlm_ref_sem);
1365         if (++ldlm_refcount == 1) {
1366                 rc = ldlm_setup();
1367                 if (rc)
1368                         ldlm_refcount--;
1369         }
1370         up(&ldlm_ref_sem);
1371
1372         RETURN(rc);
1373 }
1374
1375 void ldlm_put_ref(int force)
1376 {
1377         down(&ldlm_ref_sem);
1378         if (ldlm_refcount == 1) {
1379                 int rc = ldlm_cleanup(force);
1380                 if (rc)
1381                         CERROR("ldlm_cleanup failed: %d\n", rc);
1382                 else
1383                         ldlm_refcount--;
1384         } else {
1385                 ldlm_refcount--;
1386         }
1387         up(&ldlm_ref_sem);
1388
1389         EXIT;
1390 }
1391
1392 static int ldlm_setup(void)
1393 {
1394         struct ldlm_bl_pool *blp;
1395         int rc = 0;
1396 #ifdef __KERNEL__
1397         int i;
1398 #endif
1399         ENTRY;
1400
1401         if (ldlm_state != NULL)
1402                 RETURN(-EALREADY);
1403
1404         OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
1405         if (ldlm_state == NULL)
1406                 RETURN(-ENOMEM);
1407
1408 #ifdef __KERNEL__
1409         rc = ldlm_proc_setup();
1410         if (rc != 0)
1411                 GOTO(out_free, rc);
1412 #endif
1413
1414         ldlm_state->ldlm_cb_service =
1415                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
1416                                 LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
1417                                 1500, ldlm_callback_handler, "ldlm_cbd",
1418                                 ldlm_svc_proc_dir);
1419
1420         if (!ldlm_state->ldlm_cb_service) {
1421                 CERROR("failed to start service\n");
1422                 GOTO(out_proc, rc = -ENOMEM);
1423         }
1424
1425         ldlm_state->ldlm_cancel_service =
1426                 ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE,
1427                                 LDLM_CANCEL_REQUEST_PORTAL,
1428                                 LDLM_CANCEL_REPLY_PORTAL, 30000,
1429                                 ldlm_cancel_handler, "ldlm_canceld",
1430                                 ldlm_svc_proc_dir);
1431
1432         if (!ldlm_state->ldlm_cancel_service) {
1433                 CERROR("failed to start service\n");
1434                 GOTO(out_proc, rc = -ENOMEM);
1435         }
1436
1437         OBD_ALLOC(blp, sizeof(*blp));
1438         if (blp == NULL)
1439                 GOTO(out_proc, rc = -ENOMEM);
1440         ldlm_state->ldlm_bl_pool = blp;
1441
1442         atomic_set(&blp->blp_num_threads, 0);
1443         init_waitqueue_head(&blp->blp_waitq);
1444         spin_lock_init(&blp->blp_lock);
1445
1446         INIT_LIST_HEAD(&blp->blp_list);
1447
1448 #ifdef __KERNEL__
1449         for (i = 0; i < LDLM_NUM_THREADS; i++) {
1450                 struct ldlm_bl_thread_data bltd = {
1451                         .bltd_num = i,
1452                         .bltd_blp = blp,
1453                 };
1454                 init_completion(&blp->blp_comp);
1455                 rc = kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1456                 if (rc < 0) {
1457                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
1458                         GOTO(out_thread, rc);
1459                 }
1460                 wait_for_completion(&blp->blp_comp);
1461         }
1462
1463         rc = ptlrpc_start_n_threads(NULL, ldlm_state->ldlm_cancel_service,
1464                                     LDLM_NUM_THREADS, "ldlm_cn");
1465         if (rc)
1466                 GOTO(out_thread, rc);
1467
1468         rc = ptlrpc_start_n_threads(NULL, ldlm_state->ldlm_cb_service,
1469                                     LDLM_NUM_THREADS, "ldlm_cb");
1470         if (rc)
1471                 GOTO(out_thread, rc);
1472
1473         INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
1474         spin_lock_init(&expired_lock_thread.elt_lock);
1475         expired_lock_thread.elt_state = ELT_STOPPED;
1476         init_waitqueue_head(&expired_lock_thread.elt_waitq);
1477
1478         rc = kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FS);
1479         if (rc < 0) {
1480                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
1481                 GOTO(out_thread, rc);
1482         }
1483
1484         wait_event(expired_lock_thread.elt_waitq,
1485                    expired_lock_thread.elt_state == ELT_READY);
1486
1487         INIT_LIST_HEAD(&waiting_locks_list);
1488         spin_lock_init(&waiting_locks_spinlock);
1489         waiting_locks_timer.function = waiting_locks_callback;
1490         waiting_locks_timer.data = 0;
1491         init_timer(&waiting_locks_timer);
1492 #endif
1493
1494         RETURN(0);
1495
1496 #ifdef __KERNEL__
1497  out_thread:
1498         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
1499         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
1500 #endif
1501
1502  out_proc:
1503 #ifdef __KERNEL__
1504         ldlm_proc_cleanup();
1505  out_free:
1506 #endif
1507         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
1508         ldlm_state = NULL;
1509         return rc;
1510 }
1511
1512 static int ldlm_cleanup(int force)
1513 {
1514 #ifdef __KERNEL__
1515         struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
1516 #endif
1517         ENTRY;
1518
1519         if (!list_empty(&ldlm_namespace_list)) {
1520                 CERROR("ldlm still has namespaces; clean these up first.\n");
1521                 ldlm_dump_all_namespaces(D_DLMTRACE);
1522                 RETURN(-EBUSY);
1523         }
1524
1525 #ifdef __KERNEL__
1526         while (atomic_read(&blp->blp_num_threads) > 0) {
1527                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
1528
1529                 init_completion(&blp->blp_comp);
1530
1531                 spin_lock(&blp->blp_lock);
1532                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
1533                 wake_up(&blp->blp_waitq);
1534                 spin_unlock(&blp->blp_lock);
1535
1536                 wait_for_completion(&blp->blp_comp);
1537         }
1538         OBD_FREE(blp, sizeof(*blp));
1539
1540         ptlrpc_stop_all_threads(ldlm_state->ldlm_cb_service);
1541         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
1542         ptlrpc_stop_all_threads(ldlm_state->ldlm_cancel_service);
1543         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
1544         ldlm_proc_cleanup();
1545
1546         expired_lock_thread.elt_state = ELT_TERMINATE;
1547         wake_up(&expired_lock_thread.elt_waitq);
1548         wait_event(expired_lock_thread.elt_waitq,
1549                    expired_lock_thread.elt_state == ELT_STOPPED);
1550 #else
1551         ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
1552         ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
1553 #endif
1554
1555         OBD_FREE(ldlm_state, sizeof(*ldlm_state));
1556         ldlm_state = NULL;
1557
1558         RETURN(0);
1559 }
1560
1561 int __init ldlm_init(void)
1562 {
1563         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
1564                                                sizeof(struct ldlm_resource), 0,
1565                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
1566         if (ldlm_resource_slab == NULL)
1567                 return -ENOMEM;
1568
1569         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
1570                                            sizeof(struct ldlm_lock), 0,
1571                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
1572         if (ldlm_lock_slab == NULL) {
1573                 kmem_cache_destroy(ldlm_resource_slab);
1574                 return -ENOMEM;
1575         }
1576
1577         l_lock_init(&ldlm_handle_lock);
1578
1579         return 0;
1580 }
1581
1582 void __exit ldlm_exit(void)
1583 {
1584         if ( ldlm_refcount )
1585                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
1586         LASSERTF(kmem_cache_destroy(ldlm_resource_slab) == 0,
1587                  "couldn't free ldlm resource slab\n");
1588         LASSERTF(kmem_cache_destroy(ldlm_lock_slab) == 0,
1589                  "couldn't free ldlm lock slab\n");
1590
1591 }
1592
1593 /* ldlm_flock.c */
1594 EXPORT_SYMBOL(ldlm_flock_completion_ast);
1595
1596 /* ldlm_extent.c */
1597 EXPORT_SYMBOL(ldlm_extent_shift_kms);
1598
1599 /* ldlm_lock.c */
1600 EXPORT_SYMBOL(ldlm_get_processing_policy);
1601 EXPORT_SYMBOL(ldlm_lock2desc);
1602 EXPORT_SYMBOL(ldlm_register_intent);
1603 EXPORT_SYMBOL(ldlm_lockname);
1604 EXPORT_SYMBOL(ldlm_typename);
1605 EXPORT_SYMBOL(ldlm_lock2handle);
1606 EXPORT_SYMBOL(__ldlm_handle2lock);
1607 EXPORT_SYMBOL(ldlm_lock_get);
1608 EXPORT_SYMBOL(ldlm_lock_put);
1609 EXPORT_SYMBOL(ldlm_lock_match);
1610 EXPORT_SYMBOL(ldlm_lock_cancel);
1611 EXPORT_SYMBOL(ldlm_lock_addref);
1612 EXPORT_SYMBOL(ldlm_lock_decref);
1613 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
1614 EXPORT_SYMBOL(ldlm_lock_change_resource);
1615 EXPORT_SYMBOL(ldlm_lock_set_data);
1616 EXPORT_SYMBOL(ldlm_it2str);
1617 EXPORT_SYMBOL(ldlm_lock_dump);
1618 EXPORT_SYMBOL(ldlm_lock_dump_handle);
1619 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
1620 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
1621 EXPORT_SYMBOL(ldlm_lock_allow_match);
1622
1623 /* ldlm_request.c */
1624 EXPORT_SYMBOL(ldlm_completion_ast);
1625 EXPORT_SYMBOL(ldlm_expired_completion_wait);
1626 EXPORT_SYMBOL(ldlm_cli_convert);
1627 EXPORT_SYMBOL(ldlm_cli_enqueue);
1628 EXPORT_SYMBOL(ldlm_cli_cancel);
1629 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
1630 EXPORT_SYMBOL(ldlm_replay_locks);
1631 EXPORT_SYMBOL(ldlm_resource_foreach);
1632 EXPORT_SYMBOL(ldlm_namespace_foreach);
1633 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
1634 EXPORT_SYMBOL(ldlm_change_cbdata);
1635
1636 /* ldlm_lockd.c */
1637 EXPORT_SYMBOL(ldlm_server_blocking_ast);
1638 EXPORT_SYMBOL(ldlm_server_completion_ast);
1639 EXPORT_SYMBOL(ldlm_server_glimpse_ast);
1640 EXPORT_SYMBOL(ldlm_handle_enqueue);
1641 EXPORT_SYMBOL(ldlm_handle_cancel);
1642 EXPORT_SYMBOL(ldlm_handle_convert);
1643 EXPORT_SYMBOL(ldlm_del_waiting_lock);
1644 EXPORT_SYMBOL(ldlm_get_ref);
1645 EXPORT_SYMBOL(ldlm_put_ref);
1646
1647 #if 0
1648 /* ldlm_test.c */
1649 EXPORT_SYMBOL(ldlm_test);
1650 EXPORT_SYMBOL(ldlm_regression_start);
1651 EXPORT_SYMBOL(ldlm_regression_stop);
1652 #endif
1653
1654 /* ldlm_resource.c */
1655 EXPORT_SYMBOL(ldlm_namespace_new);
1656 EXPORT_SYMBOL(ldlm_namespace_cleanup);
1657 EXPORT_SYMBOL(ldlm_namespace_free);
1658 EXPORT_SYMBOL(ldlm_namespace_dump);
1659 EXPORT_SYMBOL(ldlm_dump_all_namespaces);
1660 EXPORT_SYMBOL(ldlm_resource_get);
1661 EXPORT_SYMBOL(ldlm_resource_putref);
1662
1663 /* l_lock.c */
1664 EXPORT_SYMBOL(l_lock);
1665 EXPORT_SYMBOL(l_unlock);
1666
1667 /* ldlm_lib.c */
1668 EXPORT_SYMBOL(client_import_add_conn);
1669 EXPORT_SYMBOL(client_import_del_conn);
1670 EXPORT_SYMBOL(client_obd_setup);
1671 EXPORT_SYMBOL(client_obd_cleanup);
1672 EXPORT_SYMBOL(client_connect_import);
1673 EXPORT_SYMBOL(client_disconnect_export);
1674 EXPORT_SYMBOL(target_start_recovery_thread);
1675 EXPORT_SYMBOL(target_stop_recovery_thread);
1676 EXPORT_SYMBOL(target_handle_connect);
1677 EXPORT_SYMBOL(target_cleanup_recovery);
1678 EXPORT_SYMBOL(target_destroy_export);
1679 EXPORT_SYMBOL(target_cancel_recovery_timer);
1680 EXPORT_SYMBOL(target_send_reply);
1681 EXPORT_SYMBOL(target_queue_recovery_request);
1682 EXPORT_SYMBOL(target_handle_ping);
1683 EXPORT_SYMBOL(target_handle_disconnect);