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