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 "ldlm_internal.h"
  41
  42 extern kmem_cache_t *ldlm_resource_slab;
  43 extern kmem_cache_t *ldlm_lock_slab;
  44 extern struct lustre_lock ldlm_handle_lock;
  45 extern struct list_head ldlm_namespace_list;
  46 extern int (*mds_reint_p)(int offset, struct ptlrpc_request *req);
  47 extern int (*mds_getattr_name_p)(int offset, struct ptlrpc_request *req);
  48
  49 static DECLARE_MUTEX(ldlm_ref_sem);
  50 static int ldlm_refcount = 0;
  51
  52 /* LDLM state */
  53
  54 static struct ldlm_state *ldlm ;
  55
  56 inline unsigned long round_timeout(unsigned long timeout)
  57 {
  58         return ((timeout / HZ) + 1) * HZ;
  59 }
  60
  61 #ifdef __KERNEL__
  62 /* XXX should this be per-ldlm? */
  63 static struct list_head waiting_locks_list;
  64 static spinlock_t waiting_locks_spinlock;
  65 static struct timer_list waiting_locks_timer;
  66
  67 static struct expired_lock_thread {
  68         wait_queue_head_t         elt_waitq;
  69         int                       elt_state;
  70         struct list_head          elt_expired_locks;
  71         spinlock_t                elt_lock;
  72 } expired_lock_thread;
  73 #endif
  74
  75 #define ELT_STOPPED   0
  76 #define ELT_READY     1
  77 #define ELT_TERMINATE 2
  78
  79 struct ldlm_bl_pool {
  80         spinlock_t              blp_lock;
  81         struct list_head        blp_list;
  82         wait_queue_head_t       blp_waitq;
  83         atomic_t                blp_num_threads;
  84         struct completion       blp_comp;
  85 };
  86
  87 struct ldlm_bl_work_item {
  88         struct list_head        blwi_entry;
  89         struct ldlm_namespace   *blwi_ns;
  90         struct ldlm_lock_desc   blwi_ld;
  91         struct ldlm_lock        *blwi_lock;
  92 };
  93
  94 #ifdef __KERNEL__
  95
  96 static inline int have_expired_locks(void)
  97 {
  98         int need_to_run;
  99
 100         spin_lock_bh(&expired_lock_thread.elt_lock);
 101         need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks);
 102         spin_unlock_bh(&expired_lock_thread.elt_lock);
 103
 104         RETURN(need_to_run);
 105 }
 106
 107 static int expired_lock_main(void *arg)
 108 {
 109         struct list_head *expired = &expired_lock_thread.elt_expired_locks;
 110         struct l_wait_info lwi = { 0 };
 111         unsigned long flags;
 112
 113         ENTRY;
 114         lock_kernel();
 115         kportal_daemonize("ldlm_elt");
 116
 117         SIGNAL_MASK_LOCK(current, flags);
 118         sigfillset(&current->blocked);
 119         RECALC_SIGPENDING;
 120         SIGNAL_MASK_UNLOCK(current, flags);
 121
 122         unlock_kernel();
 123
 124         expired_lock_thread.elt_state = ELT_READY;
 125         wake_up(&expired_lock_thread.elt_waitq);
 126
 127         while (1) {
 128                 l_wait_event(expired_lock_thread.elt_waitq,
 129                              have_expired_locks() ||
 130                              expired_lock_thread.elt_state == ELT_TERMINATE,
 131                              &lwi);
 132
 133                 spin_lock_bh(&expired_lock_thread.elt_lock);
 134                 while (!list_empty(expired)) {
 135                         struct ldlm_lock *lock = list_entry(expired->next,
 136                                                             struct ldlm_lock,
 137                                                             l_pending_chain);
 138                         spin_unlock_bh(&expired_lock_thread.elt_lock);
 139
 140                         ptlrpc_fail_export(lock->l_export);
 141
 142                         spin_lock_bh(&expired_lock_thread.elt_lock);
 143                 }
 144                 spin_unlock_bh(&expired_lock_thread.elt_lock);
 145
 146                 if (expired_lock_thread.elt_state == ELT_TERMINATE)
 147                         break;
 148         }
 149
 150         expired_lock_thread.elt_state = ELT_STOPPED;
 151         wake_up(&expired_lock_thread.elt_waitq);
 152         RETURN(0);
 153 }
 154
 155 static void waiting_locks_callback(unsigned long unused)
 156 {
 157         struct ldlm_lock *lock;
 158         char str[PTL_NALFMT_SIZE];
 159
 160         spin_lock_bh(&waiting_locks_spinlock);
 161         while (!list_empty(&waiting_locks_list)) {
 162                 lock = list_entry(waiting_locks_list.next, struct ldlm_lock,
 163                                   l_pending_chain);
 164
 165                 if (lock->l_callback_timeout > jiffies)
 166                         break;
 167
 168                 LDLM_ERROR(lock, "lock callback timer expired: evicting client "
 169                            "%s@%s nid "LPX64" (%s) ",
 170                            lock->l_export->exp_client_uuid.uuid,
 171                            lock->l_export->exp_connection->c_remote_uuid.uuid,
 172                            lock->l_export->exp_connection->c_peer.peer_nid,
 173                            portals_nid2str(lock->l_export->exp_connection->c_peer.peer_ni->pni_number,
 174                                            lock->l_export->exp_connection->c_peer.peer_nid,
 175                                            str));
 176
 177                 spin_lock_bh(&expired_lock_thread.elt_lock);
 178                 list_del(&lock->l_pending_chain);
 179                 list_add(&lock->l_pending_chain,
 180                          &expired_lock_thread.elt_expired_locks);
 181                 spin_unlock_bh(&expired_lock_thread.elt_lock);
 182                 wake_up(&expired_lock_thread.elt_waitq);
 183         }
 184
 185         spin_unlock_bh(&waiting_locks_spinlock);
 186 }
 187
 188 /*
 189  * Indicate that we're waiting for a client to call us back cancelling a given
 190  * lock.  We add it to the pending-callback chain, and schedule the lock-timeout
 191  * timer to fire appropriately.  (We round up to the next second, to avoid
 192  * floods of timer firings during periods of high lock contention and traffic).
 193  */
 194 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 195 {
 196         unsigned long timeout_rounded;
 197
 198         spin_lock_bh(&waiting_locks_spinlock);
 199         if (!list_empty(&lock->l_pending_chain)) {
 200                 LDLM_DEBUG(lock, "not re-adding to wait list");
 201                 spin_unlock_bh(&waiting_locks_spinlock);
 202                 return 0;
 203         }
 204         LDLM_DEBUG(lock, "adding to wait list");
 205
 206         lock->l_callback_timeout = jiffies + (obd_timeout * HZ / 2);
 207
 208         timeout_rounded = round_timeout(lock->l_callback_timeout);
 209
 210         if (timeout_rounded < waiting_locks_timer.expires ||
 211             !timer_pending(&waiting_locks_timer)) {
 212                 mod_timer(&waiting_locks_timer, timeout_rounded);
 213         }
 214         list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */
 215         spin_unlock_bh(&waiting_locks_spinlock);
 216         return 1;
 217 }
 218
 219 /*
 220  * Remove a lock from the pending list, likely because it had its cancellation
 221  * callback arrive without incident.  This adjusts the lock-timeout timer if
 222  * needed.  Returns 0 if the lock wasn't pending after all, 1 if it was.
 223  */
 224 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 225 {
 226         struct list_head *list_next;
 227
 228         if (lock->l_export == NULL) {
 229                 /* We don't have a "waiting locks list" on clients. */
 230                 LDLM_DEBUG(lock, "client lock: no-op");
 231                 return 0;
 232         }
 233
 234         spin_lock_bh(&waiting_locks_spinlock);
 235
 236         if (list_empty(&lock->l_pending_chain)) {
 237                 spin_unlock_bh(&waiting_locks_spinlock);
 238                 LDLM_DEBUG(lock, "wasn't waiting");
 239                 return 0;
 240         }
 241
 242         list_next = lock->l_pending_chain.next;
 243         if (lock->l_pending_chain.prev == &waiting_locks_list) {
 244                 /* Removing the head of the list, adjust timer. */
 245                 if (list_next == &waiting_locks_list) {
 246                         /* No more, just cancel. */
 247                         del_timer(&waiting_locks_timer);
 248                 } else {
 249                         struct ldlm_lock *next;
 250                         next = list_entry(list_next, struct ldlm_lock,
 251                                           l_pending_chain);
 252                         mod_timer(&waiting_locks_timer,
 253                                   round_timeout(next->l_callback_timeout));
 254                 }
 255         }
 256         list_del_init(&lock->l_pending_chain);
 257         spin_unlock_bh(&waiting_locks_spinlock);
 258         LDLM_DEBUG(lock, "removed");
 259         return 1;
 260 }
 261
 262 #else /* !__KERNEL__ */
 263
 264 static int ldlm_add_waiting_lock(struct ldlm_lock *lock)
 265 {
 266         RETURN(1);
 267 }
 268
 269 int ldlm_del_waiting_lock(struct ldlm_lock *lock)
 270 {
 271         RETURN(0);
 272 }
 273
 274 #endif /* __KERNEL__ */
 275
 276 static void ldlm_failed_ast(struct ldlm_lock *lock, int rc, char *ast_type)
 277 {
 278         const struct ptlrpc_connection *conn = lock->l_export->exp_connection;
 279         char str[PTL_NALFMT_SIZE];
 280
 281         CERROR("%s AST failed (%d) for res "LPU64"/"LPU64
 282                ", mode %s: evicting client %s@%s NID "LPX64" (%s)\n",
 283                ast_type, rc,
 284                lock->l_resource->lr_name.name[0],
 285                lock->l_resource->lr_name.name[1],
 286                ldlm_lockname[lock->l_granted_mode],
 287                lock->l_export->exp_client_uuid.uuid,
 288                conn->c_remote_uuid.uuid, conn->c_peer.peer_nid,
 289                portals_nid2str(conn->c_peer.peer_ni->pni_number,
 290                                conn->c_peer.peer_nid, str));
 291         ptlrpc_fail_export(lock->l_export);
 292 }
 293
 294 int ldlm_server_blocking_ast(struct ldlm_lock *lock,
 295                              struct ldlm_lock_desc *desc,
 296                              void *data, int flag)
 297 {
 298         struct ldlm_request *body;
 299         struct ptlrpc_request *req;
 300         int rc = 0, size = sizeof(*body);
 301         ENTRY;
 302
 303         if (flag == LDLM_CB_CANCELING) {
 304                 /* Don't need to do anything here. */
 305                 RETURN(0);
 306         }
 307
 308         LASSERT(lock);
 309
 310         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 311         if (lock->l_granted_mode != lock->l_req_mode) {
 312                 /* this blocking AST will be communicated as part of the
 313                  * completion AST instead */
 314                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 315                 LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");                 RETURN(0);
 316         }
 317
 318         if (lock->l_destroyed) {
 319                 /* What's the point? */
 320                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 321                 RETURN(0);
 322         }
 323
 324 #if 0
 325         if (LTIME_S(CURRENT_TIME) - lock->l_export->exp_last_request_time > 30){
 326                 ldlm_failed_ast(lock, -ETIMEDOUT, "Not-attempted blocking");
 327                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 328                 RETURN(-ETIMEDOUT);
 329         }
 330 #endif
 331
 332         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 333                               LDLM_BL_CALLBACK, 1, &size, NULL);
 334         if (req == NULL) {
 335                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 336                 RETURN(-ENOMEM);
 337         }
 338
 339         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 340         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 341                sizeof(body->lock_handle1));
 342         memcpy(&body->lock_desc, desc, sizeof(*desc));
 343         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
 344
 345         LDLM_DEBUG(lock, "server preparing blocking AST");
 346         req->rq_replen = lustre_msg_size(0, NULL);
 347
 348         if (lock->l_granted_mode == lock->l_req_mode)
 349                 ldlm_add_waiting_lock(lock);
 350         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 351
 352         req->rq_send_state = LUSTRE_IMP_FULL;
 353         req->rq_timeout = 2; /* 2 second timeout for initial AST reply */
 354         rc = ptlrpc_queue_wait(req);
 355         if (rc == -ETIMEDOUT || rc == -EINTR) {
 356 #ifdef __KERNEL__
 357                 ldlm_del_waiting_lock(lock);
 358                 ldlm_failed_ast(lock, rc, "blocking");
 359 #else
 360                 /* XXX
 361                  * Here we treat all clients as liblustre. When BLOCKING AST
 362                  * timeout we don't evicting the client and only cancel
 363                  * the lock.
 364                  * restore to orignial implementation later!!!
 365                  * XXX
 366                  */
 367                 CERROR("BLOCKING AST to client (nid "LPU64") timeout, "
 368                        "simply cancel lock 0x%p\n",
 369                        req->rq_connection->c_peer.peer_nid, lock);
 370                 ldlm_lock_cancel(lock);
 371                 rc = -ERESTART;
 372 #endif
 373         } else if (rc) {
 374                 if (rc == -EINVAL)
 375                         CDEBUG(D_DLMTRACE, "client (nid "LPU64") returned %d "
 376                                "from blocking AST for lock %p--normal race\n",
 377                                req->rq_connection->c_peer.peer_nid,
 378                                req->rq_repmsg->status, lock);
 379                 else if (rc == -ENOTCONN)
 380                         CDEBUG(D_DLMTRACE, "client (nid "LPU64") returned %d "
 381                                "from blocking AST for lock %p--this client was "
 382                                "probably rebooted while it held a lock, nothing"
 383                                " serious\n",req->rq_connection->c_peer.peer_nid,
 384                                req->rq_repmsg->status, lock);
 385                 else
 386                         CDEBUG(D_ERROR, "client (nid "LPU64") returned %d "
 387                                "from blocking AST for lock %p\n",
 388                                req->rq_connection->c_peer.peer_nid,
 389                                (req->rq_repmsg != NULL)?
 390                                req->rq_repmsg->status : 0,
 391                                lock);
 392                 LDLM_DEBUG(lock, "client sent rc %d rq_status %d from blocking "
 393                            "AST", rc, req->rq_status);
 394                 ldlm_lock_cancel(lock);
 395                 /* Server-side AST functions are called from ldlm_reprocess_all,
 396                  * which needs to be told to please restart its reprocessing. */
 397                 rc = -ERESTART;
 398         }
 399
 400         ptlrpc_req_finished(req);
 401
 402         RETURN(rc);
 403 }
 404
 405 /* XXX copied from ptlrpc/service.c */
 406 static long timeval_sub(struct timeval *large, struct timeval *small)
 407 {
 408         return (large->tv_sec - small->tv_sec) * 1000000 +
 409                 (large->tv_usec - small->tv_usec);
 410 }
 411
 412 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
 413 {
 414         struct ldlm_request *body;
 415         struct ptlrpc_request *req;
 416         struct timeval granted_time;
 417         long total_enqueue_wait;
 418         int rc = 0, size = sizeof(*body);
 419         ENTRY;
 420
 421         if (lock == NULL) {
 422                 LBUG();
 423                 RETURN(-EINVAL);
 424         }
 425
 426         do_gettimeofday(&granted_time);
 427         total_enqueue_wait = timeval_sub(&granted_time, &lock->l_enqueued_time);
 428
 429         if (total_enqueue_wait / 1000000 > obd_timeout)
 430                 LDLM_ERROR(lock, "enqueue wait took %ldus", total_enqueue_wait);
 431
 432         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 433                               LDLM_CP_CALLBACK, 1, &size, NULL);
 434         if (!req)
 435                 RETURN(-ENOMEM);
 436
 437         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 438         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 439                sizeof(body->lock_handle1));
 440         body->lock_flags = flags;
 441         ldlm_lock2desc(lock, &body->lock_desc);
 442
 443         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
 444                    total_enqueue_wait);
 445         req->rq_replen = lustre_msg_size(0, NULL);
 446
 447         req->rq_send_state = LUSTRE_IMP_FULL;
 448         req->rq_timeout = 2; /* 2 second timeout for initial AST reply */
 449
 450         /* We only send real blocking ASTs after the lock is granted */
 451         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 452         if (lock->l_flags & LDLM_FL_AST_SENT) {
 453                 body->lock_flags |= LDLM_FL_AST_SENT;
 454                 ldlm_add_waiting_lock(lock); /* start the lock-timeout clock */
 455         }
 456         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 457
 458         rc = ptlrpc_queue_wait(req);
 459         if (rc == -ETIMEDOUT || rc == -EINTR) {
 460                 ldlm_del_waiting_lock(lock);
 461                 ldlm_failed_ast(lock, rc, "completion");
 462         } else if (rc) {
 463                 LDLM_ERROR(lock, "client sent rc %d rq_status %d from "
 464                            "completion AST\n", rc, req->rq_status);
 465                 ldlm_lock_cancel(lock);
 466                 /* Server-side AST functions are called from ldlm_reprocess_all,
 467                  * which needs to be told to please restart its reprocessing. */
 468                 rc = -ERESTART;
 469         }
 470         ptlrpc_req_finished(req);
 471
 472         RETURN(rc);
 473 }
 474
 475 int ldlm_handle_enqueue(struct ptlrpc_request *req,
 476                         ldlm_completion_callback completion_callback,
 477                         ldlm_blocking_callback blocking_callback)
 478 {
 479         struct obd_device *obddev = req->rq_export->exp_obd;
 480         struct ldlm_reply *dlm_rep;
 481         struct ldlm_request *dlm_req;
 482         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 483         __u32 flags;
 484         ldlm_error_t err;
 485         struct ldlm_lock *lock = NULL;
 486         void *cookie = NULL;
 487         ENTRY;
 488
 489         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 490
 491         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 492                                       lustre_swab_ldlm_request);
 493         if (dlm_req == NULL) {
 494                 CERROR ("Can't unpack dlm_req\n");
 495                 RETURN (-EFAULT);
 496         }
 497
 498         flags = dlm_req->lock_flags;
 499         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN &&
 500             (flags & LDLM_FL_HAS_INTENT)) {
 501                 /* In this case, the reply buffer is allocated deep in
 502                  * local_lock_enqueue by the policy function. */
 503                 cookie = req;
 504                 cookielen = sizeof(*req);
 505         } else {
 506                 rc = lustre_pack_reply(req, 1, &size, NULL);
 507                 if (rc) {
 508                         CERROR("out of memory\n");
 509                         RETURN(-ENOMEM);
 510                 }
 511                 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN) {
 512                         cookie = &dlm_req->lock_desc.l_policy_data;
 513                         cookielen = sizeof(ldlm_policy_data_t);
 514                 }
 515         }
 516
 517         /* The lock's callback data might be set in the policy function */
 518         lock = ldlm_lock_create(obddev->obd_namespace,
 519                                 &dlm_req->lock_handle2,
 520                                 dlm_req->lock_desc.l_resource.lr_name,
 521                                 dlm_req->lock_desc.l_resource.lr_type,
 522                                 dlm_req->lock_desc.l_req_mode,
 523                                 blocking_callback, completion_callback, NULL);
 524         if (!lock)
 525                 GOTO(out, err = -ENOMEM);
 526
 527         do_gettimeofday(&lock->l_enqueued_time);
 528         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 529                sizeof(lock->l_remote_handle));
 530         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 531
 532         LASSERT(req->rq_export);
 533         lock->l_export = class_export_get(req->rq_export);
 534         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 535         list_add(&lock->l_export_chain,
 536                  &lock->l_export->exp_ldlm_data.led_held_locks);
 537         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 538
 539         err = ldlm_lock_enqueue(obddev->obd_namespace, &lock, cookie, cookielen,
 540                                 &flags);
 541         if (err)
 542                 GOTO(out, err);
 543
 544         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*dlm_rep));
 545         dlm_rep->lock_flags = flags;
 546
 547         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 548         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN) {
 549                 memcpy(&dlm_rep->lock_policy_data, &lock->l_policy_data,
 550                        cookielen);
 551         }
 552         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 553                 memcpy(&dlm_rep->lock_resource_name, &lock->l_resource->lr_name,
 554                        sizeof(dlm_rep->lock_resource_name));
 555                 dlm_rep->lock_mode = lock->l_req_mode;
 556         }
 557
 558         /* We never send a blocking AST until the lock is granted, but
 559          * we can tell it right now */
 560         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 561         if (lock->l_flags & LDLM_FL_AST_SENT) {
 562                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
 563                 if (lock->l_granted_mode == lock->l_req_mode)
 564                         ldlm_add_waiting_lock(lock);
 565         }
 566         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 567
 568         EXIT;
 569  out:
 570         req->rq_status = err;
 571
 572         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
 573          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
 574         if (lock) {
 575                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 576                            "(err=%d)", err);
 577                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
 578                         ldlm_reprocess_all(lock->l_resource);
 579                 LDLM_LOCK_PUT(lock);
 580         }
 581         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p)", lock);
 582
 583         return 0;
 584 }
 585
 586 int ldlm_handle_convert(struct ptlrpc_request *req)
 587 {
 588         struct ldlm_request *dlm_req;
 589         struct ldlm_reply *dlm_rep;
 590         struct ldlm_lock *lock;
 591         int rc, size = sizeof(*dlm_rep);
 592         ENTRY;
 593
 594         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 595                                       lustre_swab_ldlm_request);
 596         if (dlm_req == NULL) {
 597                 CERROR ("Can't unpack dlm_req\n");
 598                 RETURN (-EFAULT);
 599         }
 600
 601         rc = lustre_pack_reply(req, 1, &size, NULL);
 602         if (rc) {
 603                 CERROR("out of memory\n");
 604                 RETURN(-ENOMEM);
 605         }
 606         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*dlm_rep));
 607         dlm_rep->lock_flags = dlm_req->lock_flags;
 608
 609         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 610         if (!lock) {
 611                 req->rq_status = EINVAL;
 612         } else {
 613                 LDLM_DEBUG(lock, "server-side convert handler START");
 614                 ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 615                                   &dlm_rep->lock_flags);
 616                 if (ldlm_del_waiting_lock(lock))
 617                         CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 618                 req->rq_status = 0;
 619         }
 620
 621         if (lock) {
 622                 ldlm_reprocess_all(lock->l_resource);
 623                 LDLM_DEBUG(lock, "server-side convert handler END");
 624                 LDLM_LOCK_PUT(lock);
 625         } else
 626                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 627
 628         RETURN(0);
 629 }
 630
 631 int ldlm_handle_cancel(struct ptlrpc_request *req)
 632 {
 633         struct ldlm_request *dlm_req;
 634         struct ldlm_lock *lock;
 635         char str[PTL_NALFMT_SIZE];
 636         int rc;
 637         ENTRY;
 638
 639         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 640                                       lustre_swab_ldlm_request);
 641         if (dlm_req == NULL) {
 642                 CERROR("bad request buffer for cancel\n");
 643                 RETURN(-EFAULT);
 644         }
 645
 646         rc = lustre_pack_reply(req, 0, NULL, NULL);
 647         if (rc) {
 648                 CERROR("out of memory\n");
 649                 RETURN(-ENOMEM);
 650         }
 651
 652         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 653         if (!lock) {
 654                 CERROR("received cancel for unknown lock cookie "LPX64
 655                        " from nid "LPX64" (%s)\n", dlm_req->lock_handle1.cookie,
 656                        req->rq_connection->c_peer.peer_nid,
 657                        portals_nid2str(req->rq_connection->c_peer.peer_ni->pni_number,
 658                                        req->rq_connection->c_peer.peer_nid, str));
 659                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock "
 660                                   "(cookie "LPU64")",
 661                                   dlm_req->lock_handle1.cookie);
 662                 req->rq_status = ESTALE;
 663         } else {
 664                 LDLM_DEBUG(lock, "server-side cancel handler START");
 665                 ldlm_lock_cancel(lock);
 666                 if (ldlm_del_waiting_lock(lock))
 667                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 668                 req->rq_status = 0;
 669         }
 670
 671         if (ptlrpc_reply(req) != 0)
 672                 LBUG();
 673
 674         if (lock) {
 675                 ldlm_reprocess_all(lock->l_resource);
 676                 LDLM_DEBUG(lock, "server-side cancel handler END");
 677                 LDLM_LOCK_PUT(lock);
 678         }
 679
 680         RETURN(0);
 681 }
 682
 683 static void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
 684                                     struct ldlm_lock_desc *ld,
 685                                     struct ldlm_lock *lock)
 686 {
 687         int do_ast;
 688         ENTRY;
 689
 690         l_lock(&ns->ns_lock);
 691         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 692
 693         lock->l_flags |= LDLM_FL_CBPENDING;
 694         do_ast = (!lock->l_readers && !lock->l_writers);
 695
 696         if (do_ast) {
 697                 LDLM_DEBUG(lock, "already unused, calling "
 698                            "callback (%p)", lock->l_blocking_ast);
 699                 if (lock->l_blocking_ast != NULL) {
 700                         l_unlock(&ns->ns_lock);
 701                         l_check_no_ns_lock(ns);
 702                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
 703                                              LDLM_CB_BLOCKING);
 704                         l_lock(&ns->ns_lock);
 705                 }
 706         } else {
 707                 LDLM_DEBUG(lock, "Lock still has references, will be"
 708                            " cancelled later");
 709         }
 710
 711         LDLM_DEBUG(lock, "client blocking callback handler END");
 712         l_unlock(&ns->ns_lock);
 713         LDLM_LOCK_PUT(lock);
 714         EXIT;
 715 }
 716
 717 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
 718                                     struct ldlm_namespace *ns,
 719                                     struct ldlm_request *dlm_req,
 720                                     struct ldlm_lock *lock)
 721 {
 722         LIST_HEAD(ast_list);
 723         ENTRY;
 724
 725         l_lock(&ns->ns_lock);
 726         LDLM_DEBUG(lock, "client completion callback handler START");
 727
 728         /* If we receive the completion AST before the actual enqueue returned,
 729          * then we might need to switch lock modes, resources, or extents. */
 730         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 731                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 732                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 733         }
 734         if (lock->l_resource->lr_type != LDLM_PLAIN)
 735                 memcpy(&lock->l_policy_data, &dlm_req->lock_desc.l_policy_data,
 736                        sizeof(lock->l_policy_data));
 737
 738         ldlm_resource_unlink_lock(lock);
 739         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
 740                    &lock->l_resource->lr_name,
 741                    sizeof(lock->l_resource->lr_name)) != 0) {
 742                 ldlm_lock_change_resource(ns, lock,
 743                                          dlm_req->lock_desc.l_resource.lr_name);
 744                 LDLM_DEBUG(lock, "completion AST, new resource");
 745         }
 746
 747         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
 748                 lock->l_flags |= LDLM_FL_CBPENDING;
 749                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
 750         }
 751
 752         lock->l_resource->lr_tmp = &ast_list;
 753         ldlm_grant_lock(lock, req, sizeof(*req), 1);
 754         lock->l_resource->lr_tmp = NULL;
 755         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 756         l_unlock(&ns->ns_lock);
 757         LDLM_LOCK_PUT(lock);
 758
 759         ldlm_run_ast_work(ns, &ast_list);
 760
 761         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 762                           lock);
 763         EXIT;
 764 }
 765
 766 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
 767 {
 768         req->rq_status = rc;
 769         rc = lustre_pack_reply(req, 0, NULL, NULL);
 770         if (rc)
 771                 return rc;
 772         return ptlrpc_reply(req);
 773 }
 774
 775 #ifdef __KERNEL__
 776 static int ldlm_bl_to_thread(struct ldlm_state *ldlm, struct ldlm_namespace *ns,
 777                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
 778 {
 779         struct ldlm_bl_pool *blp = ldlm->ldlm_bl_pool;
 780         struct ldlm_bl_work_item *blwi;
 781         ENTRY;
 782
 783         OBD_ALLOC(blwi, sizeof(*blwi));
 784         if (blwi == NULL)
 785                 RETURN(-ENOMEM);
 786
 787         blwi->blwi_ns = ns;
 788         blwi->blwi_ld = *ld;
 789         blwi->blwi_lock = lock;
 790
 791         spin_lock(&blp->blp_lock);
 792         list_add_tail(&blwi->blwi_entry, &blp->blp_list);
 793         wake_up(&blp->blp_waitq);
 794         spin_unlock(&blp->blp_lock);
 795
 796         RETURN(0);
 797 }
 798 #endif
 799
 800 static int ldlm_callback_handler(struct ptlrpc_request *req)
 801 {
 802         struct ldlm_namespace *ns;
 803         struct ldlm_request *dlm_req;
 804         struct ldlm_lock *lock;
 805         char str[PTL_NALFMT_SIZE];
 806         int rc;
 807         ENTRY;
 808
 809         /* Requests arrive in sender's byte order.  The ptlrpc service
 810          * handler has already checked and, if necessary, byte-swapped the
 811          * incoming request message body, but I am responsible for the
 812          * message buffers. */
 813
 814         if (req->rq_export == NULL) {
 815                 struct ldlm_request *dlm_req;
 816
 817                 CDEBUG(D_RPCTRACE, "operation %d from nid "LPX64" (%s) with bad "
 818                        "export cookie "LPX64" (ptl req %d/rep %d); this is "
 819                        "normal if this node rebooted with a lock held\n",
 820                        req->rq_reqmsg->opc, req->rq_connection->c_peer.peer_nid,
 821                        portals_nid2str(req->rq_connection->c_peer.peer_ni->pni_number,
 822                                        req->rq_connection->c_peer.peer_nid, str),
 823                        req->rq_reqmsg->handle.cookie,
 824                        req->rq_request_portal, req->rq_reply_portal);
 825
 826                 dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
 827                                              lustre_swab_ldlm_request);
 828                 if (dlm_req != NULL)
 829                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
 830                                dlm_req->lock_handle1.cookie);
 831
 832                 ldlm_callback_reply(req, -ENOTCONN);
 833                 RETURN(0);
 834         }
 835
 836         if (req->rq_reqmsg->opc == LDLM_BL_CALLBACK) {
 837                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 838         } else if (req->rq_reqmsg->opc == LDLM_CP_CALLBACK) {
 839                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 840         } else if (req->rq_reqmsg->opc == OBD_LOG_CANCEL) {
 841                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
 842         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CREATE) {
 843                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 844         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_NEXT_BLOCK) {
 845                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 846         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_READ_HEADER) {
 847                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 848         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CLOSE) {
 849                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 850         } else {
 851                 ldlm_callback_reply(req, -EPROTO);
 852                 RETURN(0);
 853         }
 854
 855         LASSERT(req->rq_export != NULL);
 856         LASSERT(req->rq_export->exp_obd != NULL);
 857
 858         /* FIXME - how to send reply */
 859         if (req->rq_reqmsg->opc == OBD_LOG_CANCEL) {
 860                 int rc = llog_origin_handle_cancel(req);
 861                 ldlm_callback_reply(req, rc);
 862                 RETURN(0);
 863         }
 864         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CREATE) {
 865                 int rc = llog_origin_handle_create(req);
 866                 req->rq_status = rc;
 867                 ptlrpc_reply(req);
 868                 RETURN(0);
 869         }
 870         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_NEXT_BLOCK) {
 871                 int rc = llog_origin_handle_next_block(req);
 872                 req->rq_status = rc;
 873                 ptlrpc_reply(req);
 874                 RETURN(0);
 875         }
 876         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_READ_HEADER) {
 877                 int rc = llog_origin_handle_read_header(req);
 878                 req->rq_status = rc;
 879                 ptlrpc_reply(req);
 880                 RETURN(0);
 881         }
 882         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CLOSE) {
 883                 int rc = llog_origin_handle_close(req);
 884                 ldlm_callback_reply(req, rc);
 885                 RETURN(0);
 886         }
 887
 888         ns = req->rq_export->exp_obd->obd_namespace;
 889         LASSERT(ns != NULL);
 890
 891         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 892                                       lustre_swab_ldlm_request);
 893         if (dlm_req == NULL) {
 894                 CERROR ("can't unpack dlm_req\n");
 895                 ldlm_callback_reply (req, -EPROTO);
 896                 RETURN (0);
 897         }
 898
 899         lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle1);
 900         if (!lock) {
 901                 CDEBUG(D_INODE, "callback on lock "LPX64" - lock disappeared\n",
 902                        dlm_req->lock_handle1.cookie);
 903                 ldlm_callback_reply(req, -EINVAL);
 904                 RETURN(0);
 905         }
 906
 907         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
 908         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
 909
 910         /* We want the ost thread to get this reply so that it can respond
 911          * to ost requests (write cache writeback) that might be triggered
 912          * in the callback.
 913          *
 914          * But we'd also like to be able to indicate in the reply that we're
 915          * cancelling right now, because it's unused, or have an intent result
 916          * in the reply, so we might have to push the responsibility for sending
 917          * the reply down into the AST handlers, alas. */
 918         if (req->rq_reqmsg->opc != LDLM_BL_CALLBACK)
 919                 ldlm_callback_reply(req, 0);
 920
 921         switch (req->rq_reqmsg->opc) {
 922         case LDLM_BL_CALLBACK:
 923                 CDEBUG(D_INODE, "blocking ast\n");
 924 #ifdef __KERNEL__
 925                 rc = ldlm_bl_to_thread(ldlm, ns, &dlm_req->lock_desc, lock);
 926                 ldlm_callback_reply(req, rc);
 927 #else
 928                 rc = 0;
 929                 ldlm_callback_reply(req, rc);
 930                 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
 931 #endif
 932                 break;
 933         case LDLM_CP_CALLBACK:
 934                 CDEBUG(D_INODE, "completion ast\n");
 935                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
 936                 break;
 937         default:
 938                 LBUG();                         /* checked above */
 939         }
 940
 941         RETURN(0);
 942 }
 943
 944 static int ldlm_cancel_handler(struct ptlrpc_request *req)
 945 {
 946         int rc;
 947         ENTRY;
 948
 949         /* Requests arrive in sender's byte order.  The ptlrpc service
 950          * handler has already checked and, if necessary, byte-swapped the
 951          * incoming request message body, but I am responsible for the
 952          * message buffers. */
 953
 954         if (req->rq_export == NULL) {
 955                 struct ldlm_request *dlm_req;
 956                 CERROR("operation %d with bad export (ptl req %d/rep %d)\n",
 957                        req->rq_reqmsg->opc, req->rq_request_portal,
 958                        req->rq_reply_portal);
 959                 CERROR("--> export cookie: "LPX64"\n",
 960                        req->rq_reqmsg->handle.cookie);
 961                 dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
 962                                              lustre_swab_ldlm_request);
 963                 if (dlm_req != NULL)
 964                         ldlm_lock_dump_handle(D_ERROR, &dlm_req->lock_handle1);
 965                 RETURN(-ENOTCONN);
 966         }
 967
 968         switch (req->rq_reqmsg->opc) {
 969
 970         /* XXX FIXME move this back to mds/handler.c, bug 249 */
 971         case LDLM_CANCEL:
 972                 CDEBUG(D_INODE, "cancel\n");
 973                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 974                 rc = ldlm_handle_cancel(req);
 975                 if (rc)
 976                         break;
 977                 RETURN(0);
 978
 979         default:
 980                 CERROR("invalid opcode %d\n", req->rq_reqmsg->opc);
 981                 RETURN(-EINVAL);
 982         }
 983
 984         RETURN(0);
 985 }
 986
 987 #ifdef __KERNEL__
 988 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
 989 {
 990         struct ldlm_bl_work_item *blwi = NULL;
 991
 992         spin_lock(&blp->blp_lock);
 993         if (!list_empty(&blp->blp_list)) {
 994                 blwi = list_entry(blp->blp_list.next, struct ldlm_bl_work_item,
 995                                   blwi_entry);
 996                 list_del(&blwi->blwi_entry);
 997         }
 998         spin_unlock(&blp->blp_lock);
 999
1000         return blwi;
1001 }
1002
1003 struct ldlm_bl_thread_data {
1004         int                     bltd_num;
1005         struct ldlm_bl_pool     *bltd_blp;
1006 };
1007
1008 static int ldlm_bl_thread_main(void *arg)
1009 {
1010         struct ldlm_bl_thread_data *bltd = arg;
1011         struct ldlm_bl_pool *blp = bltd->bltd_blp;
1012         unsigned long flags;
1013         ENTRY;
1014
1015         /* XXX boiler-plate */
1016         {
1017                 char name[sizeof(current->comm)];
1018                 snprintf(name, sizeof(name) - 1, "ldlm_bl_%02d",
1019                          bltd->bltd_num);
1020                 kportal_daemonize(name);
1021         }
1022         SIGNAL_MASK_LOCK(current, flags);
1023         sigfillset(&current->blocked);
1024         RECALC_SIGPENDING;
1025         SIGNAL_MASK_UNLOCK(current, flags);
1026
1027         atomic_inc(&blp->blp_num_threads);
1028         complete(&blp->blp_comp);
1029
1030         while(1) {
1031                 struct l_wait_info lwi = { 0 };
1032                 struct ldlm_bl_work_item *blwi = NULL;
1033
1034                 l_wait_event_exclusive(blp->blp_waitq,
1035                                        (blwi = ldlm_bl_get_work(blp)) != NULL,
1036                                        &lwi);
1037
1038                 if (blwi->blwi_ns == NULL)
1039                         break;
1040
1041                 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1042                                         blwi->blwi_lock);
1043                 OBD_FREE(blwi, sizeof(*blwi));
1044         }
1045
1046         atomic_dec(&blp->blp_num_threads);
1047         complete(&blp->blp_comp);
1048         RETURN(0);
1049 }
1050
1051 #endif
1052
1053 static int ldlm_setup(void);
1054 static int ldlm_cleanup(int force);
1055
1056 int ldlm_get_ref(void)
1057 {
1058         int rc = 0;
1059         down(&ldlm_ref_sem);
1060         if (++ldlm_refcount == 1) {
1061                 rc = ldlm_setup();
1062                 if (rc)
1063                         ldlm_refcount--;
1064         }
1065         up(&ldlm_ref_sem);
1066
1067         RETURN(rc);
1068 }
1069
1070 void ldlm_put_ref(int force)
1071 {
1072         down(&ldlm_ref_sem);
1073         if (ldlm_refcount == 1) {
1074                 int rc = ldlm_cleanup(force);
1075                 if (rc)
1076                         CERROR("ldlm_cleanup failed: %d\n", rc);
1077                 else
1078                         ldlm_refcount--;
1079         } else {
1080                 ldlm_refcount--;
1081         }
1082         up(&ldlm_ref_sem);
1083
1084         EXIT;
1085 }
1086
1087 static int ldlm_setup(void)
1088 {
1089         struct ldlm_bl_pool *blp;
1090         int rc = 0;
1091 #ifdef __KERNEL__
1092         int i;
1093 #endif
1094         ENTRY;
1095
1096         if (ldlm != NULL)
1097                 RETURN(-EALREADY);
1098
1099         OBD_ALLOC(ldlm, sizeof(*ldlm));
1100         if (ldlm == NULL)
1101                 RETURN(-ENOMEM);
1102
1103 #ifdef __KERNEL__
1104         rc = ldlm_proc_setup();
1105         if (rc != 0)
1106                 GOTO(out_free, rc);
1107 #endif
1108
1109         ldlm->ldlm_cb_service =
1110                 ptlrpc_init_svc(LDLM_NEVENTS, LDLM_NBUFS, LDLM_BUFSIZE,
1111                                 LDLM_MAXREQSIZE, LDLM_CB_REQUEST_PORTAL,
1112                                 LDLM_CB_REPLY_PORTAL,
1113                                 ldlm_callback_handler, "ldlm_cbd",
1114                                 ldlm_svc_proc_dir);
1115
1116         if (!ldlm->ldlm_cb_service) {
1117                 CERROR("failed to start service\n");
1118                 GOTO(out_proc, rc = -ENOMEM);
1119         }
1120
1121         ldlm->ldlm_cancel_service =
1122                 ptlrpc_init_svc(LDLM_NEVENTS, LDLM_NBUFS, LDLM_BUFSIZE,
1123                                 LDLM_MAXREQSIZE, LDLM_CANCEL_REQUEST_PORTAL,
1124                                 LDLM_CANCEL_REPLY_PORTAL,
1125                                 ldlm_cancel_handler, "ldlm_canceld",
1126                                 ldlm_svc_proc_dir);
1127
1128         if (!ldlm->ldlm_cancel_service) {
1129                 CERROR("failed to start service\n");
1130                 GOTO(out_proc, rc = -ENOMEM);
1131         }
1132
1133         OBD_ALLOC(blp, sizeof(*blp));
1134         if (blp == NULL)
1135                 GOTO(out_proc, rc = -ENOMEM);
1136         ldlm->ldlm_bl_pool = blp;
1137
1138         atomic_set(&blp->blp_num_threads, 0);
1139         init_waitqueue_head(&blp->blp_waitq);
1140         spin_lock_init(&blp->blp_lock);
1141
1142         INIT_LIST_HEAD(&blp->blp_list);
1143
1144 #ifdef __KERNEL__
1145         for (i = 0; i < LDLM_NUM_THREADS; i++) {
1146                 struct ldlm_bl_thread_data bltd = {
1147                         .bltd_num = i,
1148                         .bltd_blp = blp,
1149                 };
1150                 init_completion(&blp->blp_comp);
1151                 rc = kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1152                 if (rc < 0) {
1153                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
1154                         LBUG();
1155                         GOTO(out_thread, rc);
1156                 }
1157                 wait_for_completion(&blp->blp_comp);
1158         }
1159
1160         rc = ptlrpc_start_n_threads(NULL, ldlm->ldlm_cancel_service,
1161                                     LDLM_NUM_THREADS, "ldlm_cn");
1162         if (rc) {
1163                 LBUG();
1164                 GOTO(out_thread, rc);
1165         }
1166
1167         rc = ptlrpc_start_n_threads(NULL, ldlm->ldlm_cb_service,
1168                                     LDLM_NUM_THREADS, "ldlm_cb");
1169         if (rc) {
1170                 LBUG();
1171                 GOTO(out_thread, rc);
1172         }
1173
1174         INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
1175         spin_lock_init(&expired_lock_thread.elt_lock);
1176         expired_lock_thread.elt_state = ELT_STOPPED;
1177         init_waitqueue_head(&expired_lock_thread.elt_waitq);
1178
1179         rc = kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FS);
1180         if (rc < 0) {
1181                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
1182                 GOTO(out_thread, rc);
1183         }
1184
1185         wait_event(expired_lock_thread.elt_waitq,
1186                    expired_lock_thread.elt_state == ELT_READY);
1187
1188         INIT_LIST_HEAD(&waiting_locks_list);
1189         spin_lock_init(&waiting_locks_spinlock);
1190         waiting_locks_timer.function = waiting_locks_callback;
1191         waiting_locks_timer.data = 0;
1192         init_timer(&waiting_locks_timer);
1193 #endif
1194
1195         RETURN(0);
1196
1197 #ifdef __KERNEL__
1198  out_thread:
1199         ptlrpc_unregister_service(ldlm->ldlm_cancel_service);
1200         ptlrpc_unregister_service(ldlm->ldlm_cb_service);
1201 #endif
1202
1203  out_proc:
1204 #ifdef __KERNEL__
1205         ldlm_proc_cleanup();
1206  out_free:
1207 #endif
1208         OBD_FREE(ldlm, sizeof(*ldlm));
1209         ldlm = NULL;
1210         return rc;
1211 }
1212
1213 static int ldlm_cleanup(int force)
1214 {
1215 #ifdef __KERNEL__
1216         struct ldlm_bl_pool *blp = ldlm->ldlm_bl_pool;
1217 #endif
1218         ENTRY;
1219
1220         if (!list_empty(&ldlm_namespace_list)) {
1221                 CERROR("ldlm still has namespaces; clean these up first.\n");
1222                 ldlm_dump_all_namespaces();
1223                 RETURN(-EBUSY);
1224         }
1225
1226 #ifdef __KERNEL__
1227         while (atomic_read(&blp->blp_num_threads) > 0) {
1228                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
1229
1230                 init_completion(&blp->blp_comp);
1231
1232                 spin_lock(&blp->blp_lock);
1233                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
1234                 wake_up(&blp->blp_waitq);
1235                 spin_unlock(&blp->blp_lock);
1236
1237                 wait_for_completion(&blp->blp_comp);
1238         }
1239         OBD_FREE(blp, sizeof(*blp));
1240
1241         ptlrpc_stop_all_threads(ldlm->ldlm_cb_service);
1242         ptlrpc_unregister_service(ldlm->ldlm_cb_service);
1243         ptlrpc_stop_all_threads(ldlm->ldlm_cancel_service);
1244         ptlrpc_unregister_service(ldlm->ldlm_cancel_service);
1245         ldlm_proc_cleanup();
1246
1247         expired_lock_thread.elt_state = ELT_TERMINATE;
1248         wake_up(&expired_lock_thread.elt_waitq);
1249         wait_event(expired_lock_thread.elt_waitq,
1250                    expired_lock_thread.elt_state == ELT_STOPPED);
1251
1252 #endif
1253
1254         OBD_FREE(ldlm, sizeof(*ldlm));
1255         ldlm = NULL;
1256
1257         RETURN(0);
1258 }
1259
1260 int __init ldlm_init(void)
1261 {
1262         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
1263                                                sizeof(struct ldlm_resource), 0,
1264                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
1265         if (ldlm_resource_slab == NULL)
1266                 return -ENOMEM;
1267
1268         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
1269                                            sizeof(struct ldlm_lock), 0,
1270                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
1271         if (ldlm_lock_slab == NULL) {
1272                 kmem_cache_destroy(ldlm_resource_slab);
1273                 return -ENOMEM;
1274         }
1275
1276         l_lock_init(&ldlm_handle_lock);
1277
1278         return 0;
1279 }
1280
1281 void __exit ldlm_exit(void)
1282 {
1283         if ( ldlm_refcount )
1284                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
1285         if (kmem_cache_destroy(ldlm_resource_slab) != 0)
1286                 CERROR("couldn't free ldlm resource slab\n");
1287         if (kmem_cache_destroy(ldlm_lock_slab) != 0)
1288                 CERROR("couldn't free ldlm lock slab\n");
1289 }
1290
1291 /* ldlm_flock.c */
1292 EXPORT_SYMBOL(ldlm_flock_completion_ast);
1293
1294 /* ldlm_lock.c */
1295 EXPORT_SYMBOL(ldlm_lock2desc);
1296 EXPORT_SYMBOL(ldlm_register_intent);
1297 EXPORT_SYMBOL(ldlm_unregister_intent);
1298 EXPORT_SYMBOL(ldlm_lockname);
1299 EXPORT_SYMBOL(ldlm_typename);
1300 EXPORT_SYMBOL(ldlm_lock2handle);
1301 EXPORT_SYMBOL(__ldlm_handle2lock);
1302 EXPORT_SYMBOL(ldlm_lock_put);
1303 EXPORT_SYMBOL(ldlm_lock_match);
1304 EXPORT_SYMBOL(ldlm_lock_cancel);
1305 EXPORT_SYMBOL(ldlm_lock_addref);
1306 EXPORT_SYMBOL(ldlm_lock_decref);
1307 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
1308 EXPORT_SYMBOL(ldlm_lock_change_resource);
1309 EXPORT_SYMBOL(ldlm_lock_set_data);
1310 EXPORT_SYMBOL(ldlm_it2str);
1311 EXPORT_SYMBOL(ldlm_lock_dump);
1312 EXPORT_SYMBOL(ldlm_lock_dump_handle);
1313 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
1314 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
1315
1316 /* ldlm_request.c */
1317 EXPORT_SYMBOL(ldlm_completion_ast);
1318 EXPORT_SYMBOL(ldlm_expired_completion_wait);
1319 EXPORT_SYMBOL(ldlm_cli_convert);
1320 EXPORT_SYMBOL(ldlm_cli_enqueue);
1321 EXPORT_SYMBOL(ldlm_cli_cancel);
1322 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
1323 EXPORT_SYMBOL(ldlm_replay_locks);
1324 EXPORT_SYMBOL(ldlm_resource_foreach);
1325 EXPORT_SYMBOL(ldlm_namespace_foreach);
1326 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
1327 EXPORT_SYMBOL(ldlm_change_cbdata);
1328
1329 /* ldlm_lockd.c */
1330 EXPORT_SYMBOL(ldlm_server_blocking_ast);
1331 EXPORT_SYMBOL(ldlm_server_completion_ast);
1332 EXPORT_SYMBOL(ldlm_handle_enqueue);
1333 EXPORT_SYMBOL(ldlm_handle_cancel);
1334 EXPORT_SYMBOL(ldlm_handle_convert);
1335 EXPORT_SYMBOL(ldlm_del_waiting_lock);
1336 EXPORT_SYMBOL(ldlm_get_ref);
1337 EXPORT_SYMBOL(ldlm_put_ref);
1338
1339 #if 0
1340 /* ldlm_test.c */
1341 EXPORT_SYMBOL(ldlm_test);
1342 EXPORT_SYMBOL(ldlm_regression_start);
1343 EXPORT_SYMBOL(ldlm_regression_stop);
1344 #endif
1345
1346 /* ldlm_resource.c */
1347 EXPORT_SYMBOL(ldlm_namespace_new);
1348 EXPORT_SYMBOL(ldlm_namespace_cleanup);
1349 EXPORT_SYMBOL(ldlm_namespace_free);
1350
1351 /* l_lock.c */
1352 EXPORT_SYMBOL(l_lock);
1353 EXPORT_SYMBOL(l_unlock);
1354
1355 /* ldlm_lib.c */
1356 EXPORT_SYMBOL(client_obd_setup);
1357 EXPORT_SYMBOL(client_obd_cleanup);
1358 EXPORT_SYMBOL(client_connect_import);
1359 EXPORT_SYMBOL(client_disconnect_export);
1360 EXPORT_SYMBOL(target_abort_recovery);
1361 EXPORT_SYMBOL(target_handle_connect);
1362 EXPORT_SYMBOL(target_destroy_export);
1363 EXPORT_SYMBOL(target_cancel_recovery_timer);
1364 EXPORT_SYMBOL(target_send_reply);
1365 EXPORT_SYMBOL(target_queue_recovery_request);
1366 EXPORT_SYMBOL(target_handle_ping);
1367 EXPORT_SYMBOL(target_handle_disconnect);
1368 EXPORT_SYMBOL(target_queue_final_reply);
1369 EXPORT_SYMBOL(ldlm_put_lock_into_req);