lustre/ldlm/ldlm_request.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  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #define DEBUG_SUBSYSTEM S_LDLM
  23 #ifndef __KERNEL__
  24 #include <signal.h>
  25 #include <liblustre.h>
  26 #endif
  27
  28 #include <linux/lustre_dlm.h>
  29 #include <linux/obd_class.h>
  30 #include <linux/obd.h>
  31
  32 #include "ldlm_internal.h"
  33
  34 static void interrupted_completion_wait(void *data)
  35 {
  36 }
  37
  38 struct lock_wait_data {
  39         struct ldlm_lock *lwd_lock;
  40         int               lwd_generation;
  41 };
  42
  43 int ldlm_expired_completion_wait(void *data)
  44 {
  45         struct lock_wait_data *lwd = data;
  46         struct ldlm_lock *lock = lwd->lwd_lock;
  47         struct obd_import *imp;
  48         struct obd_device *obd;
  49
  50         if (lock->l_conn_export == NULL) {
  51                 static unsigned long next_dump = 0, last_dump = 0;
  52
  53                 if (ptlrpc_check_suspend())
  54                         RETURN(0);
  55
  56                 LDLM_ERROR(lock, "lock timed out; not entering recovery in "
  57                            "server code, just going back to sleep");
  58                 if (time_after(jiffies, next_dump)) {
  59                         last_dump = next_dump;
  60                         next_dump = jiffies + 300 * HZ;
  61                         ldlm_namespace_dump(D_DLMTRACE,
  62                                             lock->l_resource->lr_namespace);
  63                         if (last_dump == 0)
  64                                 portals_debug_dumplog();
  65                 }
  66                 RETURN(0);
  67         }
  68
  69         obd = lock->l_conn_export->exp_obd;
  70         imp = obd->u.cli.cl_import;
  71         ptlrpc_fail_import(imp, lwd->lwd_generation);
  72         LDLM_ERROR(lock, "lock timed out, entering recovery for %s@%s",
  73                    imp->imp_target_uuid.uuid,
  74                    imp->imp_connection->c_remote_uuid.uuid);
  75
  76         RETURN(0);
  77 }
  78
  79 int ldlm_completion_ast(struct ldlm_lock *lock, int flags, void *data)
  80 {
  81         /* XXX ALLOCATE - 160 bytes */
  82         struct lock_wait_data lwd;
  83         unsigned long irqflags;
  84         struct obd_device *obd;
  85         struct obd_import *imp = NULL;
  86         struct l_wait_info lwi;
  87         int rc = 0;
  88         ENTRY;
  89
  90         if (flags == LDLM_FL_WAIT_NOREPROC)
  91                 goto noreproc;
  92
  93         if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
  94                        LDLM_FL_BLOCK_CONV))) {
  95                 wake_up(&lock->l_waitq);
  96                 RETURN(0);
  97         }
  98
  99         LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
 100                    "sleeping");
 101         ldlm_lock_dump(D_OTHER, lock, 0);
 102         ldlm_reprocess_all(lock->l_resource);
 103
 104 noreproc:
 105
 106         obd = class_exp2obd(lock->l_conn_export);
 107
 108         /* if this is a local lock, then there is no import */
 109         if (obd != NULL)
 110                 imp = obd->u.cli.cl_import;
 111
 112         lwd.lwd_lock = lock;
 113
 114         if (flags & LDLM_FL_NO_TIMEOUT) {
 115                 LDLM_DEBUG(lock, "waiting indefinitely for group lock\n");
 116                 lwi = LWI_INTR(interrupted_completion_wait, &lwd);
 117         } else {
 118                 lwi = LWI_TIMEOUT_INTR(obd_timeout * HZ,
 119                                        ldlm_expired_completion_wait,
 120                                        interrupted_completion_wait, &lwd);
 121         }
 122
 123         if (imp != NULL) {
 124                 spin_lock_irqsave(&imp->imp_lock, irqflags);
 125                 lwd.lwd_generation = imp->imp_generation;
 126                 spin_unlock_irqrestore(&imp->imp_lock, irqflags);
 127         }
 128
 129         /* Go to sleep until the lock is granted or cancelled. */
 130         rc = l_wait_event(lock->l_waitq,
 131                           ((lock->l_req_mode == lock->l_granted_mode) ||
 132                            (lock->l_flags & LDLM_FL_FAILED)), &lwi);
 133
 134         if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
 135                 LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
 136                 RETURN(-EIO);
 137         }
 138
 139         if (rc) {
 140                 LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
 141                            rc);
 142                 RETURN(rc);
 143         }
 144
 145         LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
 146         RETURN(0);
 147 }
 148
 149 static int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
 150                                   struct ldlm_res_id res_id,
 151                                   __u32 type,
 152                                   ldlm_policy_data_t *policy,
 153                                   ldlm_mode_t mode,
 154                                   int *flags,
 155                                   ldlm_blocking_callback blocking,
 156                                   ldlm_completion_callback completion,
 157                                   ldlm_glimpse_callback glimpse,
 158                                   void *data, __u32 lvb_len,
 159                                   void *lvb_swabber,
 160                                   struct lustre_handle *lockh)
 161 {
 162         struct ldlm_lock *lock;
 163         int err;
 164         ENTRY;
 165
 166         if (ns->ns_client) {
 167                 CERROR("Trying to enqueue local lock in a shadow namespace\n");
 168                 LBUG();
 169         }
 170
 171         lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
 172                                 completion, glimpse, data, lvb_len);
 173         if (!lock)
 174                 GOTO(out_nolock, err = -ENOMEM);
 175         LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
 176
 177         ldlm_lock_addref_internal(lock, mode);
 178         ldlm_lock2handle(lock, lockh);
 179         lock->l_flags |= LDLM_FL_LOCAL;
 180         lock->l_lvb_swabber = lvb_swabber;
 181         if (policy != NULL)
 182                 memcpy(&lock->l_policy_data, policy, sizeof(*policy));
 183         if (type == LDLM_EXTENT)
 184                 memcpy(&lock->l_req_extent, &policy->l_extent,
 185                        sizeof(policy->l_extent));
 186
 187         err = ldlm_lock_enqueue(ns, &lock, policy, flags);
 188         if (err != ELDLM_OK)
 189                 GOTO(out, err);
 190
 191         if (policy != NULL)
 192                 memcpy(policy, &lock->l_policy_data, sizeof(*policy));
 193         if ((*flags) & LDLM_FL_LOCK_CHANGED)
 194                 memcpy(&res_id, &lock->l_resource->lr_name, sizeof(res_id));
 195
 196         LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
 197                           lock);
 198
 199         if (lock->l_completion_ast)
 200                 lock->l_completion_ast(lock, *flags, NULL);
 201
 202         LDLM_DEBUG(lock, "client-side local enqueue END");
 203         EXIT;
 204  out:
 205         LDLM_LOCK_PUT(lock);
 206  out_nolock:
 207         return err;
 208 }
 209
 210 static void failed_lock_cleanup(struct ldlm_namespace *ns,
 211                                 struct ldlm_lock *lock,
 212                                 struct lustre_handle *lockh, int mode)
 213 {
 214         /* Set a flag to prevent us from sending a CANCEL (bug 407) */
 215         l_lock(&ns->ns_lock);
 216         lock->l_flags |= LDLM_FL_LOCAL_ONLY;
 217         LDLM_DEBUG(lock, "setting FL_LOCAL_ONLY");
 218         l_unlock(&ns->ns_lock);
 219
 220         ldlm_lock_decref_and_cancel(lockh, mode);
 221
 222         /* XXX - HACK because we shouldn't call ldlm_lock_destroy()
 223          *       from llite/file.c/ll_file_flock(). */
 224         if (lock->l_resource->lr_type == LDLM_FLOCK) {
 225                 ldlm_lock_destroy(lock);
 226         }
 227 }
 228
 229 int ldlm_cli_enqueue(struct obd_export *exp,
 230                      struct ptlrpc_request *req,
 231                      struct ldlm_namespace *ns,
 232                      struct ldlm_res_id res_id,
 233                      __u32 type,
 234                      ldlm_policy_data_t *policy,
 235                      ldlm_mode_t mode,
 236                      int *flags,
 237                      ldlm_blocking_callback blocking,
 238                      ldlm_completion_callback completion,
 239                      ldlm_glimpse_callback glimpse,
 240                      void *data,
 241                      void *lvb,
 242                      __u32 lvb_len,
 243                      void *lvb_swabber,
 244                      struct lustre_handle *lockh)
 245 {
 246         struct ldlm_lock *lock;
 247         struct ldlm_request *body;
 248         struct ldlm_reply *reply;
 249         int rc, size[3] = {0, sizeof(*body), lvb_len}, req_passed_in = 1;
 250         int is_replay = *flags & LDLM_FL_REPLAY;
 251         int cleanup_phase = 0;
 252         ENTRY;
 253
 254         if (exp == NULL) {
 255                 LASSERT(!is_replay);
 256                 rc = ldlm_cli_enqueue_local(ns, res_id, type, policy, mode,
 257                                             flags, blocking, completion,
 258                                             glimpse, data, lvb_len, lvb_swabber,
 259                                             lockh);
 260                 RETURN(rc);
 261         }
 262
 263         /* If we're replaying this lock, just check some invariants.
 264          * If we're creating a new lock, get everything all setup nice. */
 265         if (is_replay) {
 266                 lock = ldlm_handle2lock(lockh);
 267                 LDLM_DEBUG(lock, "client-side enqueue START");
 268                 LASSERT(exp == lock->l_conn_export);
 269         } else {
 270                 lock = ldlm_lock_create(ns, NULL, res_id, type, mode, blocking,
 271                                         completion, glimpse, data, lvb_len);
 272                 if (lock == NULL)
 273                         RETURN(-ENOMEM);
 274                 /* for the local lock, add the reference */
 275                 ldlm_lock_addref_internal(lock, mode);
 276                 ldlm_lock2handle(lock, lockh);
 277                 lock->l_lvb_swabber = lvb_swabber;
 278                 if (policy != NULL)
 279                         memcpy(&lock->l_policy_data, policy, sizeof(*policy));
 280                 if (type == LDLM_EXTENT)
 281                         memcpy(&lock->l_req_extent, &policy->l_extent,
 282                                sizeof(policy->l_extent));
 283                 LDLM_DEBUG(lock, "client-side enqueue START");
 284         }
 285
 286         /* lock not sent to server yet */
 287         cleanup_phase = 2;
 288
 289         if (req == NULL) {
 290                 req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_DLM_VERSION,
 291                                       LDLM_ENQUEUE, 2, size, NULL);
 292                 if (req == NULL)
 293                         GOTO(cleanup, rc = -ENOMEM);
 294                 req_passed_in = 0;
 295         }
 296
 297         LASSERTF(req->rq_reqmsg->buflens[MDS_REQ_INTENT_LOCKREQ_OFF] ==
 298                  sizeof(*body), "buflen[%d] = %d, not %d\n",
 299                  MDS_REQ_INTENT_LOCKREQ_OFF,
 300                  req->rq_reqmsg->buflens[MDS_REQ_INTENT_LOCKREQ_OFF],
 301                  sizeof(*body));
 302
 303         /* Dump lock data into the request buffer */
 304         body = lustre_msg_buf(req->rq_reqmsg, MDS_REQ_INTENT_LOCKREQ_OFF,
 305                               sizeof (*body));
 306         ldlm_lock2desc(lock, &body->lock_desc);
 307         body->lock_flags = *flags;
 308
 309         memcpy(&body->lock_handle1, lockh, sizeof(*lockh));
 310
 311         /* Continue as normal. */
 312         if (!req_passed_in) {
 313                 size[0] = sizeof(*reply);
 314                 req->rq_replen = lustre_msg_size(1 + (lvb_len > 0), size);
 315         }
 316         lock->l_conn_export = exp;
 317         lock->l_export = NULL;
 318         lock->l_blocking_ast = blocking;
 319
 320         LDLM_DEBUG(lock, "sending request");
 321         rc = ptlrpc_queue_wait(req);
 322
 323         if (rc != ELDLM_OK) {
 324                 LASSERT(!is_replay);
 325                 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
 326                            rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
 327                 if (rc == ELDLM_LOCK_ABORTED) {
 328                         /* Before we return, swab the reply */
 329                         reply = lustre_swab_repbuf(req, 0, sizeof(*reply),
 330                                                    lustre_swab_ldlm_reply);
 331                         if (reply == NULL) {
 332                                 CERROR("Can't unpack ldlm_reply\n");
 333                                 rc = -EPROTO;
 334                         }
 335                         if (lvb_len) {
 336                                 void *tmplvb;
 337                                 tmplvb = lustre_swab_repbuf(req, 1, lvb_len,
 338                                                             lvb_swabber);
 339                                 if (tmplvb == NULL)
 340                                         GOTO(cleanup, rc = -EPROTO);
 341                                 if (lvb != NULL)
 342                                         memcpy(lvb, tmplvb, lvb_len);
 343                         }
 344                 }
 345                 GOTO(cleanup, rc);
 346         }
 347
 348         reply = lustre_swab_repbuf(req, 0, sizeof(*reply),
 349                                    lustre_swab_ldlm_reply);
 350         if (reply == NULL) {
 351                 CERROR("Can't unpack ldlm_reply\n");
 352                 GOTO(cleanup, rc = -EPROTO);
 353         }
 354
 355         /* lock enqueued on the server */
 356         cleanup_phase = 1;
 357
 358         memcpy(&lock->l_remote_handle, &reply->lock_handle,
 359                sizeof(lock->l_remote_handle));
 360         *flags = reply->lock_flags;
 361
 362         CDEBUG(D_INFO, "local: %p, remote cookie: "LPX64", flags: 0x%x\n",
 363                lock, reply->lock_handle.cookie, *flags);
 364
 365         /* If enqueue returned a blocked lock but the completion handler has
 366          * already run, then it fixed up the resource and we don't need to do it
 367          * again. */
 368         if ((*flags) & LDLM_FL_LOCK_CHANGED) {
 369                 int newmode = reply->lock_desc.l_req_mode;
 370                 LASSERT(!is_replay);
 371                 if (newmode && newmode != lock->l_req_mode) {
 372                         LDLM_DEBUG(lock, "server returned different mode %s",
 373                                    ldlm_lockname[newmode]);
 374                         lock->l_req_mode = newmode;
 375                 }
 376
 377                 if (reply->lock_desc.l_resource.lr_name.name[0] !=
 378                     lock->l_resource->lr_name.name[0] ||
 379                    reply->lock_desc.l_resource.lr_name.name[1] !=
 380                     lock->l_resource->lr_name.name[1]) {
 381                         CDEBUG(D_INFO, "remote intent success, locking %ld "
 382                                "instead of %ld\n",
 383                               (long)reply->lock_desc.l_resource.lr_name.name[0],
 384                                (long)lock->l_resource->lr_name.name[0]);
 385
 386                         ldlm_lock_change_resource(ns, lock,
 387                                            reply->lock_desc.l_resource.lr_name);
 388                         if (lock->l_resource == NULL) {
 389                                 LBUG();
 390                                 GOTO(cleanup, rc = -ENOMEM);
 391                         }
 392                         LDLM_DEBUG(lock, "client-side enqueue, new resource");
 393                 }
 394                 if (policy != NULL)
 395                         memcpy(&lock->l_policy_data,
 396                                &reply->lock_desc.l_policy_data,
 397                                sizeof(reply->lock_desc.l_policy_data));
 398                 if (type != LDLM_PLAIN)
 399                         LDLM_DEBUG(lock,"client-side enqueue, new policy data");
 400         }
 401
 402         if ((*flags) & LDLM_FL_AST_SENT) {
 403                 l_lock(&ns->ns_lock);
 404                 lock->l_flags |= LDLM_FL_CBPENDING;
 405                 l_unlock(&ns->ns_lock);
 406                 LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
 407         }
 408
 409         /* If the lock has already been granted by a completion AST, don't
 410          * clobber the LVB with an older one. */
 411         if (lvb_len && (lock->l_req_mode != lock->l_granted_mode)) {
 412                 void *tmplvb;
 413                 tmplvb = lustre_swab_repbuf(req, 1, lvb_len, lvb_swabber);
 414                 if (tmplvb == NULL) {
 415                         cleanup_phase = 2;
 416                         GOTO(cleanup, rc = -EPROTO);
 417                 }
 418                 memcpy(lock->l_lvb_data, tmplvb, lvb_len);
 419         }
 420
 421         if (!is_replay) {
 422                 rc = ldlm_lock_enqueue(ns, &lock, NULL, flags);
 423                 if (lock->l_completion_ast != NULL) {
 424                         int err = lock->l_completion_ast(lock, *flags, NULL);
 425                         if (!rc)
 426                                 rc = err;
 427                         if (rc)
 428                                 cleanup_phase = 2;
 429                 }
 430         }
 431
 432         if (lvb_len && lvb != NULL) {
 433                 /* Copy the LVB here, and not earlier, because the completion
 434                  * AST (if any) can override what we got in the reply */
 435                 memcpy(lvb, lock->l_lvb_data, lvb_len);
 436         }
 437
 438         LDLM_DEBUG(lock, "client-side enqueue END");
 439         EXIT;
 440 cleanup:
 441         switch (cleanup_phase) {
 442         case 2:
 443                 if (rc)
 444                         failed_lock_cleanup(ns, lock, lockh, mode);
 445         case 1:
 446                 if (!req_passed_in && req != NULL)
 447                         ptlrpc_req_finished(req);
 448         }
 449
 450         LDLM_LOCK_PUT(lock);
 451         return rc;
 452 }
 453
 454 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
 455                                   int *flags)
 456 {
 457         struct ldlm_resource *res;
 458         int rc;
 459         ENTRY;
 460         if (lock->l_resource->lr_namespace->ns_client) {
 461                 CERROR("Trying to cancel local lock\n");
 462                 LBUG();
 463         }
 464         LDLM_DEBUG(lock, "client-side local convert");
 465
 466         res = ldlm_lock_convert(lock, new_mode, flags);
 467         if (res) {
 468                 ldlm_reprocess_all(res);
 469                 rc = 0;
 470         } else {
 471                 rc = EDEADLOCK;
 472         }
 473         LDLM_DEBUG(lock, "client-side local convert handler END");
 474         LDLM_LOCK_PUT(lock);
 475         RETURN(rc);
 476 }
 477
 478 /* FIXME: one of ldlm_cli_convert or the server side should reject attempted
 479  * conversion of locks which are on the waiting or converting queue */
 480 /* Caller of this code is supposed to take care of lock readers/writers
 481    accounting */
 482 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, int *flags)
 483 {
 484         struct ldlm_request *body;
 485         struct ldlm_reply *reply;
 486         struct ldlm_lock *lock;
 487         struct ldlm_resource *res;
 488         struct ptlrpc_request *req = NULL;
 489         int rc, size = sizeof(*body);
 490         ENTRY;
 491
 492         lock = ldlm_handle2lock(lockh);
 493         if (!lock) {
 494                 LBUG();
 495                 RETURN(-EINVAL);
 496         }
 497         *flags = 0;
 498
 499         if (lock->l_conn_export == NULL)
 500                 RETURN(ldlm_cli_convert_local(lock, new_mode, flags));
 501
 502         LDLM_DEBUG(lock, "client-side convert");
 503
 504         req = ptlrpc_prep_req(class_exp2cliimp(lock->l_conn_export),
 505                               LUSTRE_DLM_VERSION, LDLM_CONVERT, 1, &size, NULL);
 506         if (!req)
 507                 GOTO(out, rc = -ENOMEM);
 508
 509         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 510         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 511                sizeof(body->lock_handle1));
 512
 513         body->lock_desc.l_req_mode = new_mode;
 514         body->lock_flags = *flags;
 515
 516         size = sizeof(*reply);
 517         req->rq_replen = lustre_msg_size(1, &size);
 518
 519         rc = ptlrpc_queue_wait(req);
 520         if (rc != ELDLM_OK)
 521                 GOTO(out, rc);
 522
 523         reply = lustre_swab_repbuf(req, 0, sizeof (*reply),
 524                                    lustre_swab_ldlm_reply);
 525         if (reply == NULL) {
 526                 CERROR ("Can't unpack ldlm_reply\n");
 527                 GOTO (out, rc = -EPROTO);
 528         }
 529
 530         if (req->rq_status)
 531                 GOTO(out, rc = req->rq_status);
 532
 533         res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
 534         if (res != NULL) {
 535                 ldlm_reprocess_all(res);
 536                 /* Go to sleep until the lock is granted. */
 537                 /* FIXME: or cancelled. */
 538                 if (lock->l_completion_ast) {
 539                         rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
 540                                                     NULL);
 541                         if (rc)
 542                                 GOTO(out, rc);
 543                 }
 544         } else {
 545                 rc = EDEADLOCK;
 546         }
 547         EXIT;
 548  out:
 549         LDLM_LOCK_PUT(lock);
 550         ptlrpc_req_finished(req);
 551         return rc;
 552 }
 553
 554 int ldlm_cli_cancel(struct lustre_handle *lockh)
 555 {
 556         struct ptlrpc_request *req;
 557         struct ldlm_lock *lock;
 558         struct ldlm_request *body;
 559         int rc = 0, size = sizeof(*body);
 560         ENTRY;
 561
 562         /* concurrent cancels on the same handle can happen */
 563         lock = __ldlm_handle2lock(lockh, LDLM_FL_CANCELING);
 564         if (lock == NULL)
 565                 RETURN(0);
 566
 567         if (lock->l_conn_export) {
 568                 int local_only;
 569                 struct obd_import *imp;
 570
 571                 LDLM_DEBUG(lock, "client-side cancel");
 572                 /* Set this flag to prevent others from getting new references*/
 573                 l_lock(&lock->l_resource->lr_namespace->ns_lock);
 574                 lock->l_flags |= LDLM_FL_CBPENDING;
 575                 local_only = lock->l_flags & LDLM_FL_LOCAL_ONLY;
 576                 l_unlock(&lock->l_resource->lr_namespace->ns_lock);
 577                 ldlm_cancel_callback(lock);
 578
 579                 if (local_only) {
 580                         CDEBUG(D_INFO, "not sending request (at caller's "
 581                                "instruction)\n");
 582                         goto local_cancel;
 583                 }
 584
 585         restart:
 586                 imp = class_exp2cliimp(lock->l_conn_export);
 587                 if (imp == NULL || imp->imp_invalid) {
 588                         CDEBUG(D_HA, "skipping cancel on invalid import %p\n",
 589                                imp);
 590                         goto local_cancel;
 591                 }
 592
 593                 req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_CANCEL,
 594                                       1, &size, NULL);
 595                 if (!req)
 596                         GOTO(out, rc = -ENOMEM);
 597                 req->rq_no_resend = 1;
 598
 599                 /* XXX FIXME bug 249 */
 600                 req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
 601                 req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
 602
 603                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 604                 memcpy(&body->lock_handle1, &lock->l_remote_handle,
 605                        sizeof(body->lock_handle1));
 606
 607                 req->rq_replen = lustre_msg_size(0, NULL);
 608
 609                 rc = ptlrpc_queue_wait(req);
 610
 611                 if (rc == ESTALE) {
 612                         char str[PTL_NALFMT_SIZE];
 613                         CERROR("client/server (nid %s) out of sync"
 614                                " -- not fatal\n",
 615                                ptlrpc_peernid2str(&req->rq_import->
 616                                                   imp_connection->c_peer, str));
 617                 } else if (rc == -ETIMEDOUT) {
 618                         ptlrpc_req_finished(req);
 619                         GOTO(restart, rc);
 620                 } else if (rc != ELDLM_OK) {
 621                         CERROR("Got rc %d from cancel RPC: canceling "
 622                                "anyway\n", rc);
 623                 }
 624
 625                 ptlrpc_req_finished(req);
 626         local_cancel:
 627                 ldlm_lock_cancel(lock);
 628         } else {
 629                 if (lock->l_resource->lr_namespace->ns_client) {
 630                         LDLM_ERROR(lock, "Trying to cancel local lock\n");
 631                         LBUG();
 632                 }
 633                 LDLM_DEBUG(lock, "client-side local cancel");
 634                 ldlm_lock_cancel(lock);
 635                 ldlm_reprocess_all(lock->l_resource);
 636                 LDLM_DEBUG(lock, "client-side local cancel handler END");
 637         }
 638
 639         EXIT;
 640  out:
 641         LDLM_LOCK_PUT(lock);
 642         return rc;
 643 }
 644
 645 /* when called with LDLM_ASYNC the blocking callback will be handled
 646  * in a thread and this function will return after the thread has been
 647  * asked to call the callback.  when called with LDLM_SYNC the blocking
 648  * callback will be performed in this function. */
 649 int ldlm_cancel_lru(struct ldlm_namespace *ns, ldlm_sync_t sync)
 650 {
 651         struct list_head *tmp, *next;
 652         struct ldlm_lock *lock;
 653         int count, rc = 0;
 654         LIST_HEAD(cblist);
 655         ENTRY;
 656
 657 #ifndef __KERNEL__
 658         sync = LDLM_SYNC; /* force to be sync in user space */
 659 #endif
 660
 661         l_lock(&ns->ns_lock);
 662         count = ns->ns_nr_unused - ns->ns_max_unused;
 663
 664         if (count <= 0) {
 665                 l_unlock(&ns->ns_lock);
 666                 RETURN(0);
 667         }
 668
 669         list_for_each_safe(tmp, next, &ns->ns_unused_list) {
 670
 671                 lock = list_entry(tmp, struct ldlm_lock, l_lru);
 672
 673                 LASSERT(!lock->l_readers && !lock->l_writers);
 674
 675                 /* Setting the CBPENDING flag is a little misleading, but
 676                  * prevents an important race; namely, once CBPENDING is set,
 677                  * the lock can accumulate no more readers/writers.  Since
 678                  * readers and writers are already zero here, ldlm_lock_decref
 679                  * won't see this flag and call l_blocking_ast */
 680                 lock->l_flags |= LDLM_FL_CBPENDING;
 681
 682                 LDLM_LOCK_GET(lock); /* dropped by bl thread */
 683                 ldlm_lock_remove_from_lru(lock);
 684                 if (sync != LDLM_ASYNC || ldlm_bl_to_thread(ns, NULL, lock))
 685                         list_add(&lock->l_lru, &cblist);
 686
 687                 if (--count == 0)
 688                         break;
 689         }
 690         l_unlock(&ns->ns_lock);
 691
 692         list_for_each_safe(tmp, next, &cblist) {
 693                 lock = list_entry(tmp, struct ldlm_lock, l_lru);
 694                 list_del_init(&lock->l_lru);
 695                 ldlm_handle_bl_callback(ns, NULL, lock);
 696         }
 697         RETURN(rc);
 698 }
 699
 700 static int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
 701                                            struct ldlm_res_id res_id, int flags,
 702                                            void *opaque)
 703 {
 704         struct ldlm_resource *res;
 705         struct list_head *tmp, *next, list = LIST_HEAD_INIT(list);
 706         struct ldlm_ast_work *w;
 707         ENTRY;
 708
 709         res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
 710         if (res == NULL) {
 711                 /* This is not a problem. */
 712                 CDEBUG(D_INFO, "No resource "LPU64"\n", res_id.name[0]);
 713                 RETURN(0);
 714         }
 715
 716         l_lock(&ns->ns_lock);
 717         list_for_each(tmp, &res->lr_granted) {
 718                 struct ldlm_lock *lock;
 719                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 720
 721                 if (opaque != NULL && lock->l_ast_data != opaque) {
 722                         LDLM_ERROR(lock, "data %p doesn't match opaque %p",
 723                                    lock->l_ast_data, opaque);
 724                         continue;
 725                 }
 726
 727                 if (lock->l_readers || lock->l_writers) {
 728                         if (flags & LDLM_FL_CONFIG_CHANGE)
 729                                 lock->l_flags |= LDLM_FL_CBPENDING;
 730                         else if (flags & LDLM_FL_WARN)
 731                                 LDLM_ERROR(lock, "lock in use");
 732                         continue;
 733                 }
 734
 735                 /* See CBPENDING comment in ldlm_cancel_lru */
 736                 lock->l_flags |= LDLM_FL_CBPENDING;
 737
 738                 OBD_ALLOC(w, sizeof(*w));
 739                 LASSERT(w);
 740
 741                 w->w_lock = LDLM_LOCK_GET(lock);
 742
 743                 list_add(&w->w_list, &list);
 744         }
 745         l_unlock(&ns->ns_lock);
 746
 747         list_for_each_safe(tmp, next, &list) {
 748                 struct lustre_handle lockh;
 749                 int rc;
 750                 w = list_entry(tmp, struct ldlm_ast_work, w_list);
 751
 752                 if (flags & LDLM_FL_LOCAL_ONLY) {
 753                         ldlm_lock_cancel(w->w_lock);
 754                 } else {
 755                         ldlm_lock2handle(w->w_lock, &lockh);
 756                         rc = ldlm_cli_cancel(&lockh);
 757                         if (rc != ELDLM_OK)
 758                                 CERROR("ldlm_cli_cancel: %d\n", rc);
 759                 }
 760                 list_del(&w->w_list);
 761                 LDLM_LOCK_PUT(w->w_lock);
 762                 OBD_FREE(w, sizeof(*w));
 763         }
 764
 765         ldlm_resource_putref(res);
 766
 767         RETURN(0);
 768 }
 769
 770 static inline int have_no_nsresource(struct ldlm_namespace *ns)
 771 {
 772         int no_resource = 0;
 773
 774         spin_lock(&ns->ns_counter_lock);
 775         if (ns->ns_resources == 0)
 776                 no_resource = 1;
 777         spin_unlock(&ns->ns_counter_lock);
 778
 779         RETURN(no_resource);
 780 }
 781
 782 /* Cancel all locks on a namespace (or a specific resource, if given)
 783  * that have 0 readers/writers.
 784  *
 785  * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
 786  * to notify the server.
 787  * If flags & LDLM_FL_NO_CALLBACK, don't run the cancel callback.
 788  * If flags & LDLM_FL_WARN, print a warning if some locks are still in use.
 789  * If flags & LDLM_FL_CONFIG_CHANGE, mark all locks as having a pending callback
 790  */
 791 int ldlm_cli_cancel_unused(struct ldlm_namespace *ns,
 792                            struct ldlm_res_id *res_id, int flags, void *opaque)
 793 {
 794         int i;
 795         struct l_wait_info lwi = { 0 };
 796         ENTRY;
 797
 798         if (ns == NULL)
 799                 RETURN(ELDLM_OK);
 800
 801         if (res_id)
 802                 RETURN(ldlm_cli_cancel_unused_resource(ns, *res_id, flags,
 803                                                        opaque));
 804
 805         l_lock(&ns->ns_lock);
 806         for (i = 0; i < RES_HASH_SIZE; i++) {
 807                 struct list_head *tmp, *next;
 808                 list_for_each_safe(tmp, next, &(ns->ns_hash[i])) {
 809                         int rc;
 810                         struct ldlm_resource *res;
 811                         res = list_entry(tmp, struct ldlm_resource, lr_hash);
 812                         ldlm_resource_getref(res);
 813                         l_unlock(&ns->ns_lock);
 814
 815                         rc = ldlm_cli_cancel_unused_resource(ns, res->lr_name,
 816                                                              flags, opaque);
 817                         if (rc)
 818                                 CERROR("cancel_unused_res ("LPU64"): %d\n",
 819                                        res->lr_name.name[0], rc);
 820
 821                         l_lock(&ns->ns_lock);
 822                         next = tmp->next;
 823                         ldlm_resource_putref(res);
 824                 }
 825         }
 826         l_unlock(&ns->ns_lock);
 827         if (flags & LDLM_FL_CONFIG_CHANGE)
 828                 l_wait_event(ns->ns_waitq, have_no_nsresource(ns), &lwi);
 829
 830         RETURN(ELDLM_OK);
 831 }
 832
 833 /* Lock iterators. */
 834
 835 int ldlm_resource_foreach(struct ldlm_resource *res, ldlm_iterator_t iter,
 836                           void *closure)
 837 {
 838         struct list_head *tmp, *next;
 839         struct ldlm_lock *lock;
 840         int rc = LDLM_ITER_CONTINUE;
 841         struct ldlm_namespace *ns = res->lr_namespace;
 842
 843         ENTRY;
 844
 845         if (!res)
 846                 RETURN(LDLM_ITER_CONTINUE);
 847
 848         l_lock(&ns->ns_lock);
 849         list_for_each_safe(tmp, next, &res->lr_granted) {
 850                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 851
 852                 if (iter(lock, closure) == LDLM_ITER_STOP)
 853                         GOTO(out, rc = LDLM_ITER_STOP);
 854         }
 855
 856         list_for_each_safe(tmp, next, &res->lr_converting) {
 857                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 858
 859                 if (iter(lock, closure) == LDLM_ITER_STOP)
 860                         GOTO(out, rc = LDLM_ITER_STOP);
 861         }
 862
 863         list_for_each_safe(tmp, next, &res->lr_waiting) {
 864                 lock = list_entry(tmp, struct ldlm_lock, l_res_link);
 865
 866                 if (iter(lock, closure) == LDLM_ITER_STOP)
 867                         GOTO(out, rc = LDLM_ITER_STOP);
 868         }
 869  out:
 870         l_unlock(&ns->ns_lock);
 871         RETURN(rc);
 872 }
 873
 874 struct iter_helper_data {
 875         ldlm_iterator_t iter;
 876         void *closure;
 877 };
 878
 879 static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure)
 880 {
 881         struct iter_helper_data *helper = closure;
 882         return helper->iter(lock, helper->closure);
 883 }
 884
 885 static int ldlm_res_iter_helper(struct ldlm_resource *res, void *closure)
 886 {
 887         return ldlm_resource_foreach(res, ldlm_iter_helper, closure);
 888 }
 889
 890 int ldlm_namespace_foreach(struct ldlm_namespace *ns, ldlm_iterator_t iter,
 891                            void *closure)
 892 {
 893         struct iter_helper_data helper = { iter: iter, closure: closure };
 894         return ldlm_namespace_foreach_res(ns, ldlm_res_iter_helper, &helper);
 895 }
 896
 897 int ldlm_namespace_foreach_res(struct ldlm_namespace *ns,
 898                                ldlm_res_iterator_t iter, void *closure)
 899 {
 900         int i, rc = LDLM_ITER_CONTINUE;
 901
 902         l_lock(&ns->ns_lock);
 903         for (i = 0; i < RES_HASH_SIZE; i++) {
 904                 struct list_head *tmp, *next;
 905                 list_for_each_safe(tmp, next, &(ns->ns_hash[i])) {
 906                         struct ldlm_resource *res =
 907                                 list_entry(tmp, struct ldlm_resource, lr_hash);
 908
 909                         ldlm_resource_getref(res);
 910                         rc = iter(res, closure);
 911                         ldlm_resource_putref(res);
 912                         if (rc == LDLM_ITER_STOP)
 913                                 GOTO(out, rc);
 914                 }
 915         }
 916  out:
 917         l_unlock(&ns->ns_lock);
 918         RETURN(rc);
 919 }
 920
 921 /* non-blocking function to manipulate a lock whose cb_data is being put away.*/
 922 void ldlm_change_cbdata(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
 923                         ldlm_iterator_t iter, void *data)
 924 {
 925         struct ldlm_resource *res;
 926         ENTRY;
 927
 928         if (ns == NULL) {
 929                 CERROR("must pass in namespace\n");
 930                 LBUG();
 931         }
 932
 933         res = ldlm_resource_get(ns, NULL, *res_id, 0, 0);
 934         if (res == NULL) {
 935                 EXIT;
 936                 return;
 937         }
 938
 939         l_lock(&ns->ns_lock);
 940         ldlm_resource_foreach(res, iter, data);
 941         l_unlock(&ns->ns_lock);
 942         ldlm_resource_putref(res);
 943         EXIT;
 944 }
 945
 946 /* Lock replay */
 947
 948 static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure)
 949 {
 950         struct list_head *list = closure;
 951
 952         /* we use l_pending_chain here, because it's unused on clients. */
 953         list_add(&lock->l_pending_chain, list);
 954         return LDLM_ITER_CONTINUE;
 955 }
 956
 957 static int replay_lock_interpret(struct ptlrpc_request *req,
 958                                     void * data, int rc)
 959 {
 960         struct ldlm_lock *lock;
 961         struct ldlm_reply *reply;
 962
 963         atomic_dec(&req->rq_import->imp_replay_inflight);
 964         if (rc != ELDLM_OK)
 965                 GOTO(out, rc);
 966
 967         lock = req->rq_async_args.pointer_arg[0];
 968         LASSERT(lock != NULL);
 969
 970         reply = lustre_swab_repbuf(req, 0, sizeof (*reply),
 971                                    lustre_swab_ldlm_reply);
 972         if (reply == NULL) {
 973                 CERROR("Can't unpack ldlm_reply\n");
 974                 GOTO (out, rc = -EPROTO);
 975         }
 976
 977         memcpy(&lock->l_remote_handle, &reply->lock_handle,
 978                sizeof(lock->l_remote_handle));
 979         LDLM_DEBUG(lock, "replayed lock:");
 980         ptlrpc_import_recovery_state_machine(req->rq_import);
 981 out:
 982         if (rc != ELDLM_OK)
 983                 ptlrpc_connect_import(req->rq_import, NULL);
 984
 985         RETURN(rc);
 986 }
 987
 988 static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
 989 {
 990         struct ptlrpc_request *req;
 991         struct ldlm_request *body;
 992         struct ldlm_reply *reply;
 993         int buffers = 1;
 994         int size[2] = {0, sizeof(*body)};
 995         int flags;
 996
 997         /*
 998          * If granted mode matches the requested mode, this lock is granted.
 999          *
1000          * If they differ, but we have a granted mode, then we were granted
1001          * one mode and now want another: ergo, converting.
1002          *
1003          * If we haven't been granted anything and are on a resource list,
1004          * then we're blocked/waiting.
1005          *
1006          * If we haven't been granted anything and we're NOT on a resource list,
1007          * then we haven't got a reply yet and don't have a known disposition.
1008          * This happens whenever a lock enqueue is the request that triggers
1009          * recovery.
1010          */
1011         if (lock->l_granted_mode == lock->l_req_mode)
1012                 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED;
1013         else if (lock->l_granted_mode)
1014                 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV;
1015         else if (!list_empty(&lock->l_res_link))
1016                 flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT;
1017         else
1018                 flags = LDLM_FL_REPLAY;
1019
1020         req = ptlrpc_prep_req(imp, LUSTRE_DLM_VERSION, LDLM_ENQUEUE,
1021                               2, size, NULL);
1022         if (!req)
1023                 RETURN(-ENOMEM);
1024
1025         /* We're part of recovery, so don't wait for it. */
1026         req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS;
1027
1028         body = lustre_msg_buf(req->rq_reqmsg, 1, sizeof (*body));
1029         ldlm_lock2desc(lock, &body->lock_desc);
1030         body->lock_flags = flags;
1031
1032         ldlm_lock2handle(lock, &body->lock_handle1);
1033         size[0] = sizeof(*reply);
1034         if (lock->l_lvb_len != 0) {
1035                 buffers = 2;
1036                 size[1] = lock->l_lvb_len;
1037         }
1038         req->rq_replen = lustre_msg_size(buffers, size);
1039
1040         LDLM_DEBUG(lock, "replaying lock:");
1041
1042         imp->imp_locks_replayed++;
1043         atomic_inc(&req->rq_import->imp_replay_inflight);
1044         req->rq_async_args.pointer_arg[0] = lock;
1045         req->rq_interpret_reply = replay_lock_interpret;
1046         ptlrpcd_add_req(req);
1047
1048         RETURN(0);
1049 }
1050
1051 int ldlm_replay_locks(struct obd_import *imp)
1052 {
1053         struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
1054         struct list_head list, *pos, *next;
1055         struct ldlm_lock *lock;
1056         int rc = 0;
1057
1058         ENTRY;
1059         INIT_LIST_HEAD(&list);
1060
1061         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1062         LASSERT(ns != NULL);
1063
1064         /* ensure this doesn't fall to 0 before all have been queued */
1065         atomic_inc(&imp->imp_replay_inflight);
1066
1067         l_lock(&ns->ns_lock);
1068         (void)ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
1069
1070         list_for_each_safe(pos, next, &list) {
1071                 lock = list_entry(pos, struct ldlm_lock, l_pending_chain);
1072                 rc = replay_one_lock(imp, lock);
1073                 if (rc)
1074                         break; /* or try to do the rest? */
1075         }
1076         l_unlock(&ns->ns_lock);
1077
1078         atomic_dec(&imp->imp_replay_inflight);
1079
1080         RETURN(rc);
1081 }