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                 RETURN(-ETIMEDOUT);
 328         }
 329 #endif
 330
 331         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 332                               LDLM_BL_CALLBACK, 1, &size, NULL);
 333         if (!req)
 334                 RETURN(-ENOMEM);
 335
 336         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 337         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 338                sizeof(body->lock_handle1));
 339         memcpy(&body->lock_desc, desc, sizeof(*desc));
 340         body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS);
 341
 342         LDLM_DEBUG(lock, "server preparing blocking AST");
 343         req->rq_replen = lustre_msg_size(0, NULL);
 344
 345         if (lock->l_granted_mode == lock->l_req_mode)
 346                 ldlm_add_waiting_lock(lock);
 347         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 348
 349         req->rq_send_state = LUSTRE_IMP_FULL;
 350         req->rq_timeout = 2; /* 2 second timeout for initial AST reply */
 351         rc = ptlrpc_queue_wait(req);
 352         if (rc == -ETIMEDOUT || rc == -EINTR) {
 353 #ifdef __KERNEL__
 354                 ldlm_del_waiting_lock(lock);
 355                 ldlm_failed_ast(lock, rc, "blocking");
 356 #else
 357                 /* XXX
 358                  * Here we treat all clients as liblustre. When BLOCKING AST
 359                  * timeout we don't evicting the client and only cancel
 360                  * the lock.
 361                  * restore to orignial implementation later!!!
 362                  * XXX
 363                  */
 364                 CERROR("BLOCKING AST to client (nid "LPU64") timeout, "
 365                        "simply cancel lock 0x%p\n",
 366                        req->rq_connection->c_peer.peer_nid, lock);
 367                 ldlm_lock_cancel(lock);
 368                 rc = -ERESTART;
 369 #endif
 370         } else if (rc) {
 371                 if (rc == -EINVAL)
 372                         CDEBUG(D_DLMTRACE, "client (nid "LPU64") returned %d "
 373                                "from blocking AST for lock %p--normal race\n",
 374                                req->rq_connection->c_peer.peer_nid,
 375                                req->rq_repmsg->status, lock);
 376                 else if (rc == -ENOTCONN)
 377                         CDEBUG(D_DLMTRACE, "client (nid "LPU64") returned %d "
 378                                "from blocking AST for lock %p--this client was "
 379                                "probably rebooted while it held a lock, nothing"
 380                                " serious\n",req->rq_connection->c_peer.peer_nid,
 381                                req->rq_repmsg->status, lock);
 382                 else
 383                         CDEBUG(D_ERROR, "client (nid "LPU64") returned %d "
 384                                "from blocking AST for lock %p\n",
 385                                req->rq_connection->c_peer.peer_nid,
 386                                (req->rq_repmsg != NULL)?
 387                                req->rq_repmsg->status : 0,
 388                                lock);
 389                 LDLM_DEBUG(lock, "client sent rc %d rq_status %d from blocking "
 390                            "AST", rc, req->rq_status);
 391                 ldlm_lock_cancel(lock);
 392                 /* Server-side AST functions are called from ldlm_reprocess_all,
 393                  * which needs to be told to please restart its reprocessing. */
 394                 rc = -ERESTART;
 395         }
 396
 397         ptlrpc_req_finished(req);
 398
 399         RETURN(rc);
 400 }
 401
 402 /* XXX copied from ptlrpc/service.c */
 403 static long timeval_sub(struct timeval *large, struct timeval *small)
 404 {
 405         return (large->tv_sec - small->tv_sec) * 1000000 +
 406                 (large->tv_usec - small->tv_usec);
 407 }
 408
 409 int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data)
 410 {
 411         struct ldlm_request *body;
 412         struct ptlrpc_request *req;
 413         struct timeval granted_time;
 414         long total_enqueue_wait;
 415         int rc = 0, size = sizeof(*body);
 416         ENTRY;
 417
 418         if (lock == NULL) {
 419                 LBUG();
 420                 RETURN(-EINVAL);
 421         }
 422
 423         do_gettimeofday(&granted_time);
 424         total_enqueue_wait = timeval_sub(&granted_time, &lock->l_enqueued_time);
 425
 426         if (total_enqueue_wait / 1000000 > obd_timeout)
 427                 LDLM_ERROR(lock, "enqueue wait took %ldus", total_enqueue_wait);
 428
 429         req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse,
 430                               LDLM_CP_CALLBACK, 1, &size, NULL);
 431         if (!req)
 432                 RETURN(-ENOMEM);
 433
 434         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 435         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 436                sizeof(body->lock_handle1));
 437         body->lock_flags = flags;
 438         ldlm_lock2desc(lock, &body->lock_desc);
 439
 440         LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)",
 441                    total_enqueue_wait);
 442         req->rq_replen = lustre_msg_size(0, NULL);
 443
 444         req->rq_send_state = LUSTRE_IMP_FULL;
 445         req->rq_timeout = 2; /* 2 second timeout for initial AST reply */
 446
 447         /* We only send real blocking ASTs after the lock is granted */
 448         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 449         if (lock->l_flags & LDLM_FL_AST_SENT) {
 450                 body->lock_flags |= LDLM_FL_AST_SENT;
 451                 ldlm_add_waiting_lock(lock); /* start the lock-timeout clock */
 452         }
 453         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 454
 455         rc = ptlrpc_queue_wait(req);
 456         if (rc == -ETIMEDOUT || rc == -EINTR) {
 457                 ldlm_del_waiting_lock(lock);
 458                 ldlm_failed_ast(lock, rc, "completion");
 459         } else if (rc) {
 460                 LDLM_ERROR(lock, "client sent rc %d rq_status %d from "
 461                            "completion AST\n", rc, req->rq_status);
 462                 ldlm_lock_cancel(lock);
 463                 /* Server-side AST functions are called from ldlm_reprocess_all,
 464                  * which needs to be told to please restart its reprocessing. */
 465                 rc = -ERESTART;
 466         }
 467         ptlrpc_req_finished(req);
 468
 469         RETURN(rc);
 470 }
 471
 472 int ldlm_handle_enqueue(struct ptlrpc_request *req,
 473                         ldlm_completion_callback completion_callback,
 474                         ldlm_blocking_callback blocking_callback)
 475 {
 476         struct obd_device *obddev = req->rq_export->exp_obd;
 477         struct ldlm_reply *dlm_rep;
 478         struct ldlm_request *dlm_req;
 479         int rc, size = sizeof(*dlm_rep), cookielen = 0;
 480         __u32 flags;
 481         ldlm_error_t err;
 482         struct ldlm_lock *lock = NULL;
 483         void *cookie = NULL;
 484         ENTRY;
 485
 486         LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
 487
 488         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 489                                       lustre_swab_ldlm_request);
 490         if (dlm_req == NULL) {
 491                 CERROR ("Can't unpack dlm_req\n");
 492                 RETURN (-EFAULT);
 493         }
 494
 495         flags = dlm_req->lock_flags;
 496         if (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN &&
 497             (flags & LDLM_FL_HAS_INTENT)) {
 498                 /* In this case, the reply buffer is allocated deep in
 499                  * local_lock_enqueue by the policy function. */
 500                 cookie = req;
 501                 cookielen = sizeof(*req);
 502         } else {
 503                 rc = lustre_pack_reply(req, 1, &size, NULL);
 504                 if (rc) {
 505                         CERROR("out of memory\n");
 506                         RETURN(-ENOMEM);
 507                 }
 508                 if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN) {
 509                         cookie = &dlm_req->lock_desc.l_policy_data;
 510                         cookielen = sizeof(ldlm_policy_data_t);
 511                 }
 512         }
 513
 514         /* The lock's callback data might be set in the policy function */
 515         lock = ldlm_lock_create(obddev->obd_namespace,
 516                                 &dlm_req->lock_handle2,
 517                                 dlm_req->lock_desc.l_resource.lr_name,
 518                                 dlm_req->lock_desc.l_resource.lr_type,
 519                                 dlm_req->lock_desc.l_req_mode,
 520                                 blocking_callback, completion_callback, NULL);
 521         if (!lock)
 522                 GOTO(out, err = -ENOMEM);
 523
 524         do_gettimeofday(&lock->l_enqueued_time);
 525         memcpy(&lock->l_remote_handle, &dlm_req->lock_handle1,
 526                sizeof(lock->l_remote_handle));
 527         LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
 528
 529         LASSERT(req->rq_export);
 530         lock->l_export = class_export_get(req->rq_export);
 531         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 532         list_add(&lock->l_export_chain,
 533                  &lock->l_export->exp_ldlm_data.led_held_locks);
 534         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 535
 536         err = ldlm_lock_enqueue(obddev->obd_namespace, &lock, cookie, cookielen,
 537                                 &flags);
 538         if (err)
 539                 GOTO(out, err);
 540
 541         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*dlm_rep));
 542         dlm_rep->lock_flags = flags;
 543
 544         ldlm_lock2handle(lock, &dlm_rep->lock_handle);
 545         if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN) {
 546                 memcpy(&dlm_rep->lock_policy_data, &lock->l_policy_data,
 547                        cookielen);
 548         }
 549         if (dlm_rep->lock_flags & LDLM_FL_LOCK_CHANGED) {
 550                 memcpy(&dlm_rep->lock_resource_name, &lock->l_resource->lr_name,
 551                        sizeof(dlm_rep->lock_resource_name));
 552                 dlm_rep->lock_mode = lock->l_req_mode;
 553         }
 554
 555         /* We never send a blocking AST until the lock is granted, but
 556          * we can tell it right now */
 557         l_lock(&lock->l_resource->lr_namespace->ns_lock);
 558         if (lock->l_flags & LDLM_FL_AST_SENT) {
 559                 dlm_rep->lock_flags |= LDLM_FL_AST_SENT;
 560                 if (lock->l_granted_mode == lock->l_req_mode)
 561                         ldlm_add_waiting_lock(lock);
 562         }
 563         l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 564
 565         EXIT;
 566  out:
 567         req->rq_status = err;
 568
 569         /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
 570          * ldlm_reprocess_all.  If this moves, revisit that code. -phil */
 571         if (lock) {
 572                 LDLM_DEBUG(lock, "server-side enqueue handler, sending reply"
 573                            "(err=%d)", err);
 574                 if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
 575                         ldlm_reprocess_all(lock->l_resource);
 576                 LDLM_LOCK_PUT(lock);
 577         }
 578         LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p)", lock);
 579
 580         return 0;
 581 }
 582
 583 int ldlm_handle_convert(struct ptlrpc_request *req)
 584 {
 585         struct ldlm_request *dlm_req;
 586         struct ldlm_reply *dlm_rep;
 587         struct ldlm_lock *lock;
 588         int rc, size = sizeof(*dlm_rep);
 589         ENTRY;
 590
 591         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 592                                       lustre_swab_ldlm_request);
 593         if (dlm_req == NULL) {
 594                 CERROR ("Can't unpack dlm_req\n");
 595                 RETURN (-EFAULT);
 596         }
 597
 598         rc = lustre_pack_reply(req, 1, &size, NULL);
 599         if (rc) {
 600                 CERROR("out of memory\n");
 601                 RETURN(-ENOMEM);
 602         }
 603         dlm_rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*dlm_rep));
 604         dlm_rep->lock_flags = dlm_req->lock_flags;
 605
 606         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 607         if (!lock) {
 608                 req->rq_status = EINVAL;
 609         } else {
 610                 LDLM_DEBUG(lock, "server-side convert handler START");
 611                 ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode,
 612                                   &dlm_rep->lock_flags);
 613                 if (ldlm_del_waiting_lock(lock))
 614                         CDEBUG(D_DLMTRACE, "converted waiting lock %p\n", lock);
 615                 req->rq_status = 0;
 616         }
 617
 618         if (lock) {
 619                 ldlm_reprocess_all(lock->l_resource);
 620                 LDLM_DEBUG(lock, "server-side convert handler END");
 621                 LDLM_LOCK_PUT(lock);
 622         } else
 623                 LDLM_DEBUG_NOLOCK("server-side convert handler END");
 624
 625         RETURN(0);
 626 }
 627
 628 int ldlm_handle_cancel(struct ptlrpc_request *req)
 629 {
 630         struct ldlm_request *dlm_req;
 631         struct ldlm_lock *lock;
 632         char str[PTL_NALFMT_SIZE];
 633         int rc;
 634         ENTRY;
 635
 636         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 637                                       lustre_swab_ldlm_request);
 638         if (dlm_req == NULL) {
 639                 CERROR("bad request buffer for cancel\n");
 640                 RETURN(-EFAULT);
 641         }
 642
 643         rc = lustre_pack_reply(req, 0, NULL, NULL);
 644         if (rc) {
 645                 CERROR("out of memory\n");
 646                 RETURN(-ENOMEM);
 647         }
 648
 649         lock = ldlm_handle2lock(&dlm_req->lock_handle1);
 650         if (!lock) {
 651                 CERROR("received cancel for unknown lock cookie "LPX64
 652                        " from nid "LPX64" (%s)\n", dlm_req->lock_handle1.cookie,
 653                        req->rq_connection->c_peer.peer_nid,
 654                        portals_nid2str(req->rq_connection->c_peer.peer_ni->pni_number,
 655                                        req->rq_connection->c_peer.peer_nid, str));
 656                 LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock "
 657                                   "(cookie "LPU64")",
 658                                   dlm_req->lock_handle1.cookie);
 659                 req->rq_status = ESTALE;
 660         } else {
 661                 LDLM_DEBUG(lock, "server-side cancel handler START");
 662                 ldlm_lock_cancel(lock);
 663                 if (ldlm_del_waiting_lock(lock))
 664                         CDEBUG(D_DLMTRACE, "cancelled waiting lock %p\n", lock);
 665                 req->rq_status = 0;
 666         }
 667
 668         if (ptlrpc_reply(req) != 0)
 669                 LBUG();
 670
 671         if (lock) {
 672                 ldlm_reprocess_all(lock->l_resource);
 673                 LDLM_DEBUG(lock, "server-side cancel handler END");
 674                 LDLM_LOCK_PUT(lock);
 675         }
 676
 677         RETURN(0);
 678 }
 679
 680 static void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
 681                                     struct ldlm_lock_desc *ld,
 682                                     struct ldlm_lock *lock)
 683 {
 684         int do_ast;
 685         ENTRY;
 686
 687         l_lock(&ns->ns_lock);
 688         LDLM_DEBUG(lock, "client blocking AST callback handler START");
 689
 690         lock->l_flags |= LDLM_FL_CBPENDING;
 691         do_ast = (!lock->l_readers && !lock->l_writers);
 692
 693         if (do_ast) {
 694                 LDLM_DEBUG(lock, "already unused, calling "
 695                            "callback (%p)", lock->l_blocking_ast);
 696                 if (lock->l_blocking_ast != NULL) {
 697                         l_unlock(&ns->ns_lock);
 698                         l_check_no_ns_lock(ns);
 699                         lock->l_blocking_ast(lock, ld, lock->l_ast_data,
 700                                              LDLM_CB_BLOCKING);
 701                         l_lock(&ns->ns_lock);
 702                 }
 703         } else {
 704                 LDLM_DEBUG(lock, "Lock still has references, will be"
 705                            " cancelled later");
 706         }
 707
 708         LDLM_DEBUG(lock, "client blocking callback handler END");
 709         l_unlock(&ns->ns_lock);
 710         LDLM_LOCK_PUT(lock);
 711         EXIT;
 712 }
 713
 714 static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
 715                                     struct ldlm_namespace *ns,
 716                                     struct ldlm_request *dlm_req,
 717                                     struct ldlm_lock *lock)
 718 {
 719         LIST_HEAD(ast_list);
 720         ENTRY;
 721
 722         l_lock(&ns->ns_lock);
 723         LDLM_DEBUG(lock, "client completion callback handler START");
 724
 725         /* If we receive the completion AST before the actual enqueue returned,
 726          * then we might need to switch lock modes, resources, or extents. */
 727         if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
 728                 lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
 729                 LDLM_DEBUG(lock, "completion AST, new lock mode");
 730         }
 731         if (lock->l_resource->lr_type != LDLM_PLAIN)
 732                 memcpy(&lock->l_policy_data, &dlm_req->lock_desc.l_policy_data,
 733                        sizeof(lock->l_policy_data));
 734
 735         ldlm_resource_unlink_lock(lock);
 736         if (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
 737                    &lock->l_resource->lr_name,
 738                    sizeof(lock->l_resource->lr_name)) != 0) {
 739                 ldlm_lock_change_resource(ns, lock,
 740                                          dlm_req->lock_desc.l_resource.lr_name);
 741                 LDLM_DEBUG(lock, "completion AST, new resource");
 742         }
 743
 744         if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
 745                 lock->l_flags |= LDLM_FL_CBPENDING;
 746                 LDLM_DEBUG(lock, "completion AST includes blocking AST");
 747         }
 748
 749         lock->l_resource->lr_tmp = &ast_list;
 750         ldlm_grant_lock(lock, req, sizeof(*req), 1);
 751         lock->l_resource->lr_tmp = NULL;
 752         LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
 753         l_unlock(&ns->ns_lock);
 754         LDLM_LOCK_PUT(lock);
 755
 756         ldlm_run_ast_work(ns, &ast_list);
 757
 758         LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
 759                           lock);
 760         EXIT;
 761 }
 762
 763 static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
 764 {
 765         req->rq_status = rc;
 766         rc = lustre_pack_reply(req, 0, NULL, NULL);
 767         if (rc)
 768                 return rc;
 769         return ptlrpc_reply(req);
 770 }
 771
 772 #ifdef __KERNEL__
 773 static int ldlm_bl_to_thread(struct ldlm_state *ldlm, struct ldlm_namespace *ns,
 774                              struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
 775 {
 776         struct ldlm_bl_pool *blp = ldlm->ldlm_bl_pool;
 777         struct ldlm_bl_work_item *blwi;
 778         ENTRY;
 779
 780         OBD_ALLOC(blwi, sizeof(*blwi));
 781         if (blwi == NULL)
 782                 RETURN(-ENOMEM);
 783
 784         blwi->blwi_ns = ns;
 785         blwi->blwi_ld = *ld;
 786         blwi->blwi_lock = lock;
 787
 788         spin_lock(&blp->blp_lock);
 789         list_add_tail(&blwi->blwi_entry, &blp->blp_list);
 790         wake_up(&blp->blp_waitq);
 791         spin_unlock(&blp->blp_lock);
 792
 793         RETURN(0);
 794 }
 795 #endif
 796
 797 static int ldlm_callback_handler(struct ptlrpc_request *req)
 798 {
 799         struct ldlm_namespace *ns;
 800         struct ldlm_request *dlm_req;
 801         struct ldlm_lock *lock;
 802         char str[PTL_NALFMT_SIZE];
 803         int rc;
 804         ENTRY;
 805
 806         /* Requests arrive in sender's byte order.  The ptlrpc service
 807          * handler has already checked and, if necessary, byte-swapped the
 808          * incoming request message body, but I am responsible for the
 809          * message buffers. */
 810
 811         if (req->rq_export == NULL) {
 812                 struct ldlm_request *dlm_req;
 813
 814                 CDEBUG(D_RPCTRACE, "operation %d from nid "LPX64" (%s) with bad "
 815                        "export cookie "LPX64" (ptl req %d/rep %d); this is "
 816                        "normal if this node rebooted with a lock held\n",
 817                        req->rq_reqmsg->opc, req->rq_connection->c_peer.peer_nid,
 818                        portals_nid2str(req->rq_connection->c_peer.peer_ni->pni_number,
 819                                        req->rq_connection->c_peer.peer_nid, str),
 820                        req->rq_reqmsg->handle.cookie,
 821                        req->rq_request_portal, req->rq_reply_portal);
 822
 823                 dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
 824                                              lustre_swab_ldlm_request);
 825                 if (dlm_req != NULL)
 826                         CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n",
 827                                dlm_req->lock_handle1.cookie);
 828
 829                 ldlm_callback_reply(req, -ENOTCONN);
 830                 RETURN(0);
 831         }
 832
 833         if (req->rq_reqmsg->opc == LDLM_BL_CALLBACK) {
 834                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 835         } else if (req->rq_reqmsg->opc == LDLM_CP_CALLBACK) {
 836                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0);
 837         } else if (req->rq_reqmsg->opc == OBD_LOG_CANCEL) {
 838                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0);
 839         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CREATE) {
 840                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 841         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_NEXT_BLOCK) {
 842                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 843         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_READ_HEADER) {
 844                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 845         } else if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CLOSE) {
 846                 OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0);
 847         } else {
 848                 ldlm_callback_reply(req, -EPROTO);
 849                 RETURN(0);
 850         }
 851
 852         LASSERT(req->rq_export != NULL);
 853         LASSERT(req->rq_export->exp_obd != NULL);
 854
 855 #ifdef ENABLE_ORPHANS
 856         /* FIXME - how to send reply */
 857         if (req->rq_reqmsg->opc == OBD_LOG_CANCEL) {
 858                 int rc = llog_origin_handle_cancel(req);
 859                 ldlm_callback_reply(req, rc);
 860                 RETURN(0);
 861         }
 862
 863         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CREATE) {
 864                 int rc = llog_origin_handle_create(req);
 865                 req->rq_status = rc;
 866                 ptlrpc_reply(req);
 867                 RETURN(0);
 868         }
 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
 877         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_READ_HEADER) {
 878                 int rc = llog_origin_handle_read_header(req);
 879                 req->rq_status = rc;
 880                 ptlrpc_reply(req);
 881                 RETURN(0);
 882         }
 883
 884         if (req->rq_reqmsg->opc == LLOG_ORIGIN_HANDLE_CLOSE) {
 885                 int rc = llog_origin_handle_close(req);
 886                 ldlm_callback_reply(req, rc);
 887                 RETURN(0);
 888         }
 889 #endif
 890         ns = req->rq_export->exp_obd->obd_namespace;
 891         LASSERT(ns != NULL);
 892
 893         dlm_req = lustre_swab_reqbuf (req, 0, sizeof (*dlm_req),
 894                                       lustre_swab_ldlm_request);
 895         if (dlm_req == NULL) {
 896                 CERROR ("can't unpack dlm_req\n");
 897                 ldlm_callback_reply (req, -EPROTO);
 898                 RETURN (0);
 899         }
 900
 901         lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle1);
 902         if (!lock) {
 903                 CDEBUG(D_INODE, "callback on lock "LPX64" - lock disappeared\n",
 904                        dlm_req->lock_handle1.cookie);
 905                 ldlm_callback_reply(req, -EINVAL);
 906                 RETURN(0);
 907         }
 908
 909         /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
 910         lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS);
 911
 912         /* We want the ost thread to get this reply so that it can respond
 913          * to ost requests (write cache writeback) that might be triggered
 914          * in the callback.
 915          *
 916          * But we'd also like to be able to indicate in the reply that we're
 917          * cancelling right now, because it's unused, or have an intent result
 918          * in the reply, so we might have to push the responsibility for sending
 919          * the reply down into the AST handlers, alas. */
 920         if (req->rq_reqmsg->opc != LDLM_BL_CALLBACK)
 921                 ldlm_callback_reply(req, 0);
 922
 923         switch (req->rq_reqmsg->opc) {
 924         case LDLM_BL_CALLBACK:
 925                 CDEBUG(D_INODE, "blocking ast\n");
 926 #ifdef __KERNEL__
 927                 rc = ldlm_bl_to_thread(ldlm, ns, &dlm_req->lock_desc, lock);
 928                 ldlm_callback_reply(req, rc);
 929 #else
 930                 rc = 0;
 931                 ldlm_callback_reply(req, rc);
 932                 ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
 933 #endif
 934                 break;
 935         case LDLM_CP_CALLBACK:
 936                 CDEBUG(D_INODE, "completion ast\n");
 937                 ldlm_handle_cp_callback(req, ns, dlm_req, lock);
 938                 break;
 939         default:
 940                 LBUG();                         /* checked above */
 941         }
 942
 943         RETURN(0);
 944 }
 945
 946 static int ldlm_cancel_handler(struct ptlrpc_request *req)
 947 {
 948         int rc;
 949         ENTRY;
 950
 951         /* Requests arrive in sender's byte order.  The ptlrpc service
 952          * handler has already checked and, if necessary, byte-swapped the
 953          * incoming request message body, but I am responsible for the
 954          * message buffers. */
 955
 956         if (req->rq_export == NULL) {
 957                 struct ldlm_request *dlm_req;
 958                 CERROR("operation %d with bad export (ptl req %d/rep %d)\n",
 959                        req->rq_reqmsg->opc, req->rq_request_portal,
 960                        req->rq_reply_portal);
 961                 CERROR("--> export cookie: "LPX64"\n",
 962                        req->rq_reqmsg->handle.cookie);
 963                 dlm_req = lustre_swab_reqbuf(req, 0, sizeof (*dlm_req),
 964                                              lustre_swab_ldlm_request);
 965                 if (dlm_req != NULL)
 966                         ldlm_lock_dump_handle(D_ERROR, &dlm_req->lock_handle1);
 967                 RETURN(-ENOTCONN);
 968         }
 969
 970         switch (req->rq_reqmsg->opc) {
 971
 972         /* XXX FIXME move this back to mds/handler.c, bug 249 */
 973         case LDLM_CANCEL:
 974                 CDEBUG(D_INODE, "cancel\n");
 975                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 976                 rc = ldlm_handle_cancel(req);
 977                 if (rc)
 978                         break;
 979                 RETURN(0);
 980
 981         default:
 982                 CERROR("invalid opcode %d\n", req->rq_reqmsg->opc);
 983                 RETURN(-EINVAL);
 984         }
 985
 986         RETURN(0);
 987 }
 988
 989 #ifdef __KERNEL__
 990 static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
 991 {
 992         struct ldlm_bl_work_item *blwi = NULL;
 993
 994         spin_lock(&blp->blp_lock);
 995         if (!list_empty(&blp->blp_list)) {
 996                 blwi = list_entry(blp->blp_list.next, struct ldlm_bl_work_item,
 997                                   blwi_entry);
 998                 list_del(&blwi->blwi_entry);
 999         }
1000         spin_unlock(&blp->blp_lock);
1001
1002         return blwi;
1003 }
1004
1005 struct ldlm_bl_thread_data {
1006         int                     bltd_num;
1007         struct ldlm_bl_pool     *bltd_blp;
1008 };
1009
1010 static int ldlm_bl_thread_main(void *arg)
1011 {
1012         struct ldlm_bl_thread_data *bltd = arg;
1013         struct ldlm_bl_pool *blp = bltd->bltd_blp;
1014         unsigned long flags;
1015         ENTRY;
1016
1017         /* XXX boiler-plate */
1018         {
1019                 char name[sizeof(current->comm)];
1020                 snprintf(name, sizeof(name) - 1, "ldlm_bl_%02d",
1021                          bltd->bltd_num);
1022                 kportal_daemonize(name);
1023         }
1024         SIGNAL_MASK_LOCK(current, flags);
1025         sigfillset(&current->blocked);
1026         RECALC_SIGPENDING;
1027         SIGNAL_MASK_UNLOCK(current, flags);
1028
1029         atomic_inc(&blp->blp_num_threads);
1030         complete(&blp->blp_comp);
1031
1032         while(1) {
1033                 struct l_wait_info lwi = { 0 };
1034                 struct ldlm_bl_work_item *blwi = NULL;
1035
1036                 l_wait_event_exclusive(blp->blp_waitq,
1037                                        (blwi = ldlm_bl_get_work(blp)) != NULL,
1038                                        &lwi);
1039
1040                 if (blwi->blwi_ns == NULL)
1041                         break;
1042
1043                 ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
1044                                         blwi->blwi_lock);
1045                 OBD_FREE(blwi, sizeof(*blwi));
1046         }
1047
1048         atomic_dec(&blp->blp_num_threads);
1049         complete(&blp->blp_comp);
1050         RETURN(0);
1051 }
1052
1053 #endif
1054
1055 static int ldlm_setup(void);
1056 static int ldlm_cleanup(int force);
1057
1058 int ldlm_get_ref(void)
1059 {
1060         int rc = 0;
1061         down(&ldlm_ref_sem);
1062         if (++ldlm_refcount == 1) {
1063                 rc = ldlm_setup();
1064                 if (rc)
1065                         ldlm_refcount--;
1066         }
1067         up(&ldlm_ref_sem);
1068
1069         RETURN(rc);
1070 }
1071
1072 void ldlm_put_ref(int force)
1073 {
1074         down(&ldlm_ref_sem);
1075         if (ldlm_refcount == 1) {
1076                 int rc = ldlm_cleanup(force);
1077                 if (rc)
1078                         CERROR("ldlm_cleanup failed: %d\n", rc);
1079                 else
1080                         ldlm_refcount--;
1081         } else {
1082                 ldlm_refcount--;
1083         }
1084         up(&ldlm_ref_sem);
1085
1086         EXIT;
1087 }
1088
1089 static int ldlm_setup(void)
1090 {
1091         struct ldlm_bl_pool *blp;
1092         int rc = 0;
1093 #ifdef __KERNEL__
1094         int i;
1095 #endif
1096         ENTRY;
1097
1098         if (ldlm != NULL)
1099                 RETURN(-EALREADY);
1100
1101         OBD_ALLOC(ldlm, sizeof(*ldlm));
1102         if (ldlm == NULL)
1103                 RETURN(-ENOMEM);
1104
1105 #ifdef __KERNEL__
1106         rc = ldlm_proc_setup();
1107         if (rc != 0)
1108                 GOTO(out_free, rc);
1109 #endif
1110
1111         ldlm->ldlm_cb_service =
1112                 ptlrpc_init_svc(LDLM_NEVENTS, LDLM_NBUFS, LDLM_BUFSIZE,
1113                                 LDLM_MAXREQSIZE, LDLM_CB_REQUEST_PORTAL,
1114                                 LDLM_CB_REPLY_PORTAL,
1115                                 ldlm_callback_handler, "ldlm_cbd",
1116                                 ldlm_svc_proc_dir);
1117
1118         if (!ldlm->ldlm_cb_service) {
1119                 CERROR("failed to start service\n");
1120                 GOTO(out_proc, rc = -ENOMEM);
1121         }
1122
1123         ldlm->ldlm_cancel_service =
1124                 ptlrpc_init_svc(LDLM_NEVENTS, LDLM_NBUFS, LDLM_BUFSIZE,
1125                                 LDLM_MAXREQSIZE, LDLM_CANCEL_REQUEST_PORTAL,
1126                                 LDLM_CANCEL_REPLY_PORTAL,
1127                                 ldlm_cancel_handler, "ldlm_canceld",
1128                                 ldlm_svc_proc_dir);
1129
1130         if (!ldlm->ldlm_cancel_service) {
1131                 CERROR("failed to start service\n");
1132                 GOTO(out_proc, rc = -ENOMEM);
1133         }
1134
1135         OBD_ALLOC(blp, sizeof(*blp));
1136         if (blp == NULL)
1137                 GOTO(out_proc, rc = -ENOMEM);
1138         ldlm->ldlm_bl_pool = blp;
1139
1140         atomic_set(&blp->blp_num_threads, 0);
1141         init_waitqueue_head(&blp->blp_waitq);
1142         spin_lock_init(&blp->blp_lock);
1143
1144         INIT_LIST_HEAD(&blp->blp_list);
1145
1146 #ifdef __KERNEL__
1147         for (i = 0; i < LDLM_NUM_THREADS; i++) {
1148                 struct ldlm_bl_thread_data bltd = {
1149                         .bltd_num = i,
1150                         .bltd_blp = blp,
1151                 };
1152                 init_completion(&blp->blp_comp);
1153                 rc = kernel_thread(ldlm_bl_thread_main, &bltd, 0);
1154                 if (rc < 0) {
1155                         CERROR("cannot start LDLM thread #%d: rc %d\n", i, rc);
1156                         LBUG();
1157                         GOTO(out_thread, rc);
1158                 }
1159                 wait_for_completion(&blp->blp_comp);
1160         }
1161
1162         rc = ptlrpc_start_n_threads(NULL, ldlm->ldlm_cancel_service,
1163                                     LDLM_NUM_THREADS, "ldlm_cn");
1164         if (rc) {
1165                 LBUG();
1166                 GOTO(out_thread, rc);
1167         }
1168
1169         rc = ptlrpc_start_n_threads(NULL, ldlm->ldlm_cb_service,
1170                                     LDLM_NUM_THREADS, "ldlm_cb");
1171         if (rc) {
1172                 LBUG();
1173                 GOTO(out_thread, rc);
1174         }
1175
1176         INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks);
1177         spin_lock_init(&expired_lock_thread.elt_lock);
1178         expired_lock_thread.elt_state = ELT_STOPPED;
1179         init_waitqueue_head(&expired_lock_thread.elt_waitq);
1180
1181         rc = kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FS);
1182         if (rc < 0) {
1183                 CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
1184                 GOTO(out_thread, rc);
1185         }
1186
1187         wait_event(expired_lock_thread.elt_waitq,
1188                    expired_lock_thread.elt_state == ELT_READY);
1189
1190         INIT_LIST_HEAD(&waiting_locks_list);
1191         spin_lock_init(&waiting_locks_spinlock);
1192         waiting_locks_timer.function = waiting_locks_callback;
1193         waiting_locks_timer.data = 0;
1194         init_timer(&waiting_locks_timer);
1195 #endif
1196
1197         RETURN(0);
1198
1199 #ifdef __KERNEL__
1200  out_thread:
1201         ptlrpc_unregister_service(ldlm->ldlm_cancel_service);
1202         ptlrpc_unregister_service(ldlm->ldlm_cb_service);
1203 #endif
1204
1205  out_proc:
1206 #ifdef __KERNEL__
1207         ldlm_proc_cleanup();
1208  out_free:
1209 #endif
1210         OBD_FREE(ldlm, sizeof(*ldlm));
1211         ldlm = NULL;
1212         return rc;
1213 }
1214
1215 static int ldlm_cleanup(int force)
1216 {
1217 #ifdef __KERNEL__
1218         struct ldlm_bl_pool *blp = ldlm->ldlm_bl_pool;
1219 #endif
1220         ENTRY;
1221
1222         if (!list_empty(&ldlm_namespace_list)) {
1223                 CERROR("ldlm still has namespaces; clean these up first.\n");
1224                 ldlm_dump_all_namespaces();
1225                 RETURN(-EBUSY);
1226         }
1227
1228 #ifdef __KERNEL__
1229         while (atomic_read(&blp->blp_num_threads) > 0) {
1230                 struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
1231
1232                 init_completion(&blp->blp_comp);
1233
1234                 spin_lock(&blp->blp_lock);
1235                 list_add_tail(&blwi.blwi_entry, &blp->blp_list);
1236                 wake_up(&blp->blp_waitq);
1237                 spin_unlock(&blp->blp_lock);
1238
1239                 wait_for_completion(&blp->blp_comp);
1240         }
1241         OBD_FREE(blp, sizeof(*blp));
1242
1243         ptlrpc_stop_all_threads(ldlm->ldlm_cb_service);
1244         ptlrpc_unregister_service(ldlm->ldlm_cb_service);
1245         ptlrpc_stop_all_threads(ldlm->ldlm_cancel_service);
1246         ptlrpc_unregister_service(ldlm->ldlm_cancel_service);
1247         ldlm_proc_cleanup();
1248
1249         expired_lock_thread.elt_state = ELT_TERMINATE;
1250         wake_up(&expired_lock_thread.elt_waitq);
1251         wait_event(expired_lock_thread.elt_waitq,
1252                    expired_lock_thread.elt_state == ELT_STOPPED);
1253
1254 #endif
1255
1256         OBD_FREE(ldlm, sizeof(*ldlm));
1257         ldlm = NULL;
1258
1259         RETURN(0);
1260 }
1261
1262 int __init ldlm_init(void)
1263 {
1264         ldlm_resource_slab = kmem_cache_create("ldlm_resources",
1265                                                sizeof(struct ldlm_resource), 0,
1266                                                SLAB_HWCACHE_ALIGN, NULL, NULL);
1267         if (ldlm_resource_slab == NULL)
1268                 return -ENOMEM;
1269
1270         ldlm_lock_slab = kmem_cache_create("ldlm_locks",
1271                                            sizeof(struct ldlm_lock), 0,
1272                                            SLAB_HWCACHE_ALIGN, NULL, NULL);
1273         if (ldlm_lock_slab == NULL) {
1274                 kmem_cache_destroy(ldlm_resource_slab);
1275                 return -ENOMEM;
1276         }
1277
1278         l_lock_init(&ldlm_handle_lock);
1279
1280         return 0;
1281 }
1282
1283 void __exit ldlm_exit(void)
1284 {
1285         if ( ldlm_refcount )
1286                 CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
1287         if (kmem_cache_destroy(ldlm_resource_slab) != 0)
1288                 CERROR("couldn't free ldlm resource slab\n");
1289         if (kmem_cache_destroy(ldlm_lock_slab) != 0)
1290                 CERROR("couldn't free ldlm lock slab\n");
1291 }
1292
1293 /* ldlm_flock.c */
1294 EXPORT_SYMBOL(ldlm_flock_completion_ast);
1295
1296 /* ldlm_lock.c */
1297 EXPORT_SYMBOL(ldlm_lock2desc);
1298 EXPORT_SYMBOL(ldlm_register_intent);
1299 EXPORT_SYMBOL(ldlm_unregister_intent);
1300 EXPORT_SYMBOL(ldlm_lockname);
1301 EXPORT_SYMBOL(ldlm_typename);
1302 EXPORT_SYMBOL(ldlm_lock2handle);
1303 EXPORT_SYMBOL(__ldlm_handle2lock);
1304 EXPORT_SYMBOL(ldlm_lock_put);
1305 EXPORT_SYMBOL(ldlm_lock_match);
1306 EXPORT_SYMBOL(ldlm_lock_cancel);
1307 EXPORT_SYMBOL(ldlm_lock_addref);
1308 EXPORT_SYMBOL(ldlm_lock_decref);
1309 EXPORT_SYMBOL(ldlm_lock_decref_and_cancel);
1310 EXPORT_SYMBOL(ldlm_lock_change_resource);
1311 EXPORT_SYMBOL(ldlm_lock_set_data);
1312 EXPORT_SYMBOL(ldlm_it2str);
1313 EXPORT_SYMBOL(ldlm_lock_dump);
1314 EXPORT_SYMBOL(ldlm_lock_dump_handle);
1315 EXPORT_SYMBOL(ldlm_cancel_locks_for_export);
1316 EXPORT_SYMBOL(ldlm_reprocess_all_ns);
1317
1318 /* ldlm_request.c */
1319 EXPORT_SYMBOL(ldlm_completion_ast);
1320 EXPORT_SYMBOL(ldlm_expired_completion_wait);
1321 EXPORT_SYMBOL(ldlm_cli_convert);
1322 EXPORT_SYMBOL(ldlm_cli_enqueue);
1323 EXPORT_SYMBOL(ldlm_cli_cancel);
1324 EXPORT_SYMBOL(ldlm_cli_cancel_unused);
1325 EXPORT_SYMBOL(ldlm_replay_locks);
1326 EXPORT_SYMBOL(ldlm_resource_foreach);
1327 EXPORT_SYMBOL(ldlm_namespace_foreach);
1328 EXPORT_SYMBOL(ldlm_namespace_foreach_res);
1329 EXPORT_SYMBOL(ldlm_change_cbdata);
1330
1331 /* ldlm_lockd.c */
1332 EXPORT_SYMBOL(ldlm_server_blocking_ast);
1333 EXPORT_SYMBOL(ldlm_server_completion_ast);
1334 EXPORT_SYMBOL(ldlm_handle_enqueue);
1335 EXPORT_SYMBOL(ldlm_handle_cancel);
1336 EXPORT_SYMBOL(ldlm_handle_convert);
1337 EXPORT_SYMBOL(ldlm_del_waiting_lock);
1338 EXPORT_SYMBOL(ldlm_get_ref);
1339 EXPORT_SYMBOL(ldlm_put_ref);
1340
1341 #if 0
1342 /* ldlm_test.c */
1343 EXPORT_SYMBOL(ldlm_test);
1344 EXPORT_SYMBOL(ldlm_regression_start);
1345 EXPORT_SYMBOL(ldlm_regression_stop);
1346 #endif
1347
1348 /* ldlm_resource.c */
1349 EXPORT_SYMBOL(ldlm_namespace_new);
1350 EXPORT_SYMBOL(ldlm_namespace_cleanup);
1351 EXPORT_SYMBOL(ldlm_namespace_free);
1352 EXPORT_SYMBOL(ldlm_namespace_dump);
1353
1354 /* l_lock.c */
1355 EXPORT_SYMBOL(l_lock);
1356 EXPORT_SYMBOL(l_unlock);
1357
1358 /* ldlm_lib.c */
1359 EXPORT_SYMBOL(client_obd_setup);
1360 EXPORT_SYMBOL(client_obd_cleanup);
1361 EXPORT_SYMBOL(client_connect_import);
1362 EXPORT_SYMBOL(client_disconnect_export);
1363 EXPORT_SYMBOL(target_abort_recovery);
1364 EXPORT_SYMBOL(target_handle_connect);
1365 EXPORT_SYMBOL(target_destroy_export);
1366 EXPORT_SYMBOL(target_cancel_recovery_timer);
1367 EXPORT_SYMBOL(target_send_reply);
1368 EXPORT_SYMBOL(target_queue_recovery_request);
1369 EXPORT_SYMBOL(target_handle_ping);
1370 EXPORT_SYMBOL(target_handle_disconnect);
1371 EXPORT_SYMBOL(target_queue_final_reply);
1372 EXPORT_SYMBOL(ldlm_put_lock_into_req);