lustre/osp/osp_sync.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/osp/osp_sync.c
  37  *
  38  * Lustre OST Proxy Device
  39  *
  40  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  41  * Author: Mikhail Pershin <mike.pershin@intel.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_MDS
  45
  46 #include <lustre_log.h>
  47 #include "osp_internal.h"
  48
  49 static int osp_sync_id_traction_init(struct osp_device *d);
  50 static void osp_sync_id_traction_fini(struct osp_device *d);
  51 static __u32 osp_sync_id_get(struct osp_device *d, __u32 id);
  52 static void osp_sync_remove_from_tracker(struct osp_device *d);
  53
  54 /*
  55  * this is a components of OSP implementing synchronization between MDS and OST
  56  * it llogs all interesting changes (currently it's uig/gid change and object
  57  * destroy) atomically, then makes sure changes hit OST storage
  58  *
  59  * we have 4 queues of work:
  60  *
  61  * the first queue is llog itself, once read a change is stored in 2nd queue
  62  * in form of RPC (but RPC isn't fired yet).
  63  *
  64  * the second queue (opd_syn_waiting_for_commit) holds changes awaiting local
  65  * commit. once change is committed locally it migrates onto 3rd queue.
  66  *
  67  * the third queue (opd_syn_committed_here) holds changes committed locally,
  68  * but not sent to OST (as the pipe can be full). once pipe becomes non-full
  69  * we take a change from the queue and fire corresponded RPC.
  70  *
  71  * once RPC is reported committed by OST (using regular last_committed mech.)
  72  * the change jumps into 4th queue (opd_syn_committed_there), now we can
  73  * cancel corresponded llog record and release RPC
  74  *
  75  * opd_syn_changes is a number of unread llog records (to be processed).
  76  * notice this number doesn't include llog records from previous boots.
  77  * with OSP_SYN_THRESHOLD we try to batch processing a bit (TO BE IMPLEMENTED)
  78  *
  79  * opd_syn_rpc_in_progress is a number of requests in 2-4 queues.
  80  * we control this with OSP_MAX_IN_PROGRESS so that OSP don't consume
  81  * too much memory -- how to deal with 1000th OSTs ? batching could help?
  82  *
  83  * opd_syn_rpc_in_flight is a number of RPC in flight.
  84  * we control this with OSP_MAX_IN_FLIGHT
  85  */
  86
  87 /* XXX: do math to learn reasonable threshold
  88  * should it be ~ number of changes fitting bulk? */
  89
  90 #define OSP_SYN_THRESHOLD       10
  91 #define OSP_MAX_IN_FLIGHT       8
  92 #define OSP_MAX_IN_PROGRESS     4096
  93
  94 #define OSP_JOB_MAGIC           0x26112005
  95
  96 static inline int osp_sync_running(struct osp_device *d)
  97 {
  98         return !!(d->opd_syn_thread.t_flags & SVC_RUNNING);
  99 }
 100
 101 static inline int osp_sync_stopped(struct osp_device *d)
 102 {
 103         return !!(d->opd_syn_thread.t_flags & SVC_STOPPED);
 104 }
 105
 106 static inline int osp_sync_has_new_job(struct osp_device *d)
 107 {
 108         return ((d->opd_syn_last_processed_id < d->opd_syn_last_used_id) &&
 109                 (d->opd_syn_last_processed_id < d->opd_syn_last_committed_id))
 110                 || (d->opd_syn_prev_done == 0);
 111 }
 112
 113 static inline int osp_sync_low_in_progress(struct osp_device *d)
 114 {
 115         return d->opd_syn_rpc_in_progress < d->opd_syn_max_rpc_in_progress;
 116 }
 117
 118 static inline int osp_sync_low_in_flight(struct osp_device *d)
 119 {
 120         return d->opd_syn_rpc_in_flight < d->opd_syn_max_rpc_in_flight;
 121 }
 122
 123 static inline int osp_sync_has_work(struct osp_device *d)
 124 {
 125         /* has new/old changes and low in-progress? */
 126         if (osp_sync_has_new_job(d) && osp_sync_low_in_progress(d) &&
 127             osp_sync_low_in_flight(d) && d->opd_imp_connected)
 128                 return 1;
 129
 130         /* has remotely committed? */
 131         if (!cfs_list_empty(&d->opd_syn_committed_there))
 132                 return 1;
 133
 134         return 0;
 135 }
 136
 137 #define osp_sync_check_for_work(d)                      \
 138 {                                                       \
 139         if (osp_sync_has_work(d)) {                     \
 140                 wake_up(&d->opd_syn_waitq);    \
 141         }                                               \
 142 }
 143
 144 void __osp_sync_check_for_work(struct osp_device *d)
 145 {
 146         osp_sync_check_for_work(d);
 147 }
 148
 149 static inline int osp_sync_can_process_new(struct osp_device *d,
 150                                            struct llog_rec_hdr *rec)
 151 {
 152         LASSERT(d);
 153
 154         if (!osp_sync_low_in_progress(d))
 155                 return 0;
 156         if (!osp_sync_low_in_flight(d))
 157                 return 0;
 158         if (!d->opd_imp_connected)
 159                 return 0;
 160         if (d->opd_syn_prev_done == 0)
 161                 return 1;
 162         if (d->opd_syn_changes == 0)
 163                 return 0;
 164         if (rec == NULL || rec->lrh_id <= d->opd_syn_last_committed_id)
 165                 return 1;
 166         return 0;
 167 }
 168
 169 int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
 170                          llog_op_type type, struct thandle *th)
 171 {
 172         struct osp_thread_info  *osi = osp_env_info(env);
 173         struct osp_device       *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
 174         struct llog_ctxt        *ctxt;
 175         int                      rc;
 176
 177         ENTRY;
 178
 179         /* it's a layering violation, to access internals of th,
 180          * but we can do this as a sanity check, for a while */
 181         LASSERT(th->th_dev == d->opd_storage);
 182
 183         switch (type) {
 184         case MDS_UNLINK64_REC:
 185                 osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
 186                 break;
 187         case MDS_SETATTR64_REC:
 188                 osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec);
 189                 break;
 190         default:
 191                 LBUG();
 192         }
 193
 194         /* we want ->dt_trans_start() to allocate per-thandle structure */
 195         th->th_tags |= LCT_OSP_THREAD;
 196
 197         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
 198         LASSERT(ctxt);
 199
 200         rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr, th);
 201         llog_ctxt_put(ctxt);
 202
 203         RETURN(rc);
 204 }
 205
 206 static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
 207                             const struct lu_fid *fid, llog_op_type type,
 208                             int count, struct thandle *th,
 209                             const struct lu_attr *attr)
 210 {
 211         struct osp_thread_info  *osi = osp_env_info(env);
 212         struct llog_ctxt        *ctxt;
 213         struct osp_txn_info     *txn;
 214         int                      rc;
 215
 216         ENTRY;
 217
 218         /* it's a layering violation, to access internals of th,
 219          * but we can do this as a sanity check, for a while */
 220         LASSERT(th->th_dev == d->opd_storage);
 221
 222         switch (type) {
 223         case MDS_UNLINK64_REC:
 224                 osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
 225                 osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
 226                 osi->osi_unlink.lur_fid  = *fid;
 227                 osi->osi_unlink.lur_count = count;
 228                 break;
 229         case MDS_SETATTR64_REC:
 230                 rc = fid_to_ostid(fid, &osi->osi_oi);
 231                 LASSERT(rc == 0);
 232                 osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
 233                 osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
 234                 osi->osi_setattr.lsr_oi  = osi->osi_oi;
 235                 LASSERT(attr);
 236                 osi->osi_setattr.lsr_uid = attr->la_uid;
 237                 osi->osi_setattr.lsr_gid = attr->la_gid;
 238                 break;
 239         default:
 240                 LBUG();
 241         }
 242
 243         txn = osp_txn_info(&th->th_ctx);
 244         LASSERT(txn);
 245
 246         txn->oti_current_id = osp_sync_id_get(d, txn->oti_current_id);
 247         osi->osi_hdr.lrh_id = txn->oti_current_id;
 248
 249         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
 250         if (ctxt == NULL)
 251                 RETURN(-ENOMEM);
 252         rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
 253                       NULL, th);
 254         llog_ctxt_put(ctxt);
 255
 256         CDEBUG(D_OTHER, "%s: new record "DOSTID":%lu/%lu: %d\n",
 257                d->opd_obd->obd_name, POSTID(&osi->osi_cookie.lgc_lgl.lgl_oi),
 258                (unsigned long) osi->osi_cookie.lgc_lgl.lgl_ogen,
 259                (unsigned long) osi->osi_cookie.lgc_index, rc);
 260
 261         if (rc > 0)
 262                 rc = 0;
 263
 264         if (likely(rc == 0)) {
 265                 spin_lock(&d->opd_syn_lock);
 266                 d->opd_syn_changes++;
 267                 spin_unlock(&d->opd_syn_lock);
 268         }
 269
 270         RETURN(rc);
 271 }
 272
 273 int osp_sync_add(const struct lu_env *env, struct osp_object *o,
 274                  llog_op_type type, struct thandle *th,
 275                  const struct lu_attr *attr)
 276 {
 277         return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
 278                                 lu_object_fid(&o->opo_obj.do_lu), type, 1,
 279                                 th, attr);
 280 }
 281
 282 int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
 283                  struct lu_fid *fid, int lost, struct thandle *th)
 284 {
 285         return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
 286 }
 287
 288 /*
 289  * it's quite obvious we can't maintain all the structures in the memory:
 290  * while OST is down, MDS can be processing thousands and thousands of unlinks
 291  * filling persistent llogs and in-core respresentation
 292  *
 293  * this doesn't scale at all. so we need basically the following:
 294  * a) destroy/setattr append llog records
 295  * b) once llog has grown to X records, we process first Y committed records
 296  *
 297  *  once record R is found via llog_process(), it becomes committed after any
 298  *  subsequent commit callback (at the most)
 299  */
 300
 301 /*
 302  * called for each atomic on-disk change (not once per transaction batch)
 303  * and goes over the list
 304  * XXX: should be optimized?
 305  */
 306
 307 /**
 308  * called for each RPC reported committed
 309  */
 310 static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
 311 {
 312         struct osp_device *d = req->rq_cb_data;
 313
 314         CDEBUG(D_HA, "commit req %p, transno "LPU64"\n", req, req->rq_transno);
 315
 316         if (unlikely(req->rq_transno == 0))
 317                 return;
 318
 319         /* do not do any opd_dyn_rpc_* accounting here
 320          * it's done in osp_sync_interpret sooner or later */
 321
 322         LASSERT(d);
 323         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 324         LASSERT(cfs_list_empty(&req->rq_exp_list));
 325
 326         ptlrpc_request_addref(req);
 327
 328         spin_lock(&d->opd_syn_lock);
 329         cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 330         spin_unlock(&d->opd_syn_lock);
 331
 332         /* XXX: some batching wouldn't hurt */
 333         wake_up(&d->opd_syn_waitq);
 334 }
 335
 336 static int osp_sync_interpret(const struct lu_env *env,
 337                               struct ptlrpc_request *req, void *aa, int rc)
 338 {
 339         struct osp_device *d = req->rq_cb_data;
 340
 341         if (req->rq_svc_thread != (void *) OSP_JOB_MAGIC)
 342                 DEBUG_REQ(D_ERROR, req, "bad magic %p\n", req->rq_svc_thread);
 343         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 344         LASSERT(d);
 345
 346         CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
 347                cfs_atomic_read(&req->rq_refcount),
 348                rc, (unsigned) req->rq_transno);
 349         LASSERT(rc || req->rq_transno);
 350
 351         LASSERT(d->opd_pre != NULL);
 352
 353         if (rc == -ENOENT) {
 354                 /*
 355                  * we tried to destroy object or update attributes,
 356                  * but object doesn't exist anymore - cancell llog record
 357                  */
 358                 LASSERT(req->rq_transno == 0);
 359                 LASSERT(cfs_list_empty(&req->rq_exp_list));
 360
 361                 ptlrpc_request_addref(req);
 362
 363                 spin_lock(&d->opd_syn_lock);
 364                 cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 365                 spin_unlock(&d->opd_syn_lock);
 366
 367                 wake_up(&d->opd_syn_waitq);
 368         } else if (rc) {
 369                 struct obd_import *imp = req->rq_import;
 370                 /*
 371                  * error happened, we'll try to repeat on next boot ?
 372                  */
 373                 LASSERTF(req->rq_transno == 0 ||
 374                          req->rq_import_generation < imp->imp_generation,
 375                          "transno "LPU64", rc %d, gen: req %d, imp %d\n",
 376                          req->rq_transno, rc, req->rq_import_generation,
 377                          imp->imp_generation);
 378                 if (req->rq_transno == 0) {
 379                         /* this is the last time we see the request
 380                          * if transno is not zero, then commit cb
 381                          * will be called at some point */
 382                         LASSERT(d->opd_syn_rpc_in_progress > 0);
 383                         spin_lock(&d->opd_syn_lock);
 384                         d->opd_syn_rpc_in_progress--;
 385                         spin_unlock(&d->opd_syn_lock);
 386                 }
 387
 388                 wake_up(&d->opd_syn_waitq);
 389         } else if (unlikely(d->opd_pre_status == -ENOSPC)) {
 390                 /*
 391                  * if current status is -ENOSPC (lack of free space on OST)
 392                  * then we should poll OST immediately once object destroy
 393                  * is replied
 394                  */
 395                 osp_statfs_need_now(d);
 396         }
 397
 398         LASSERT(d->opd_syn_rpc_in_flight > 0);
 399         spin_lock(&d->opd_syn_lock);
 400         d->opd_syn_rpc_in_flight--;
 401         spin_unlock(&d->opd_syn_lock);
 402         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 403                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 404                d->opd_syn_rpc_in_progress);
 405
 406         osp_sync_check_for_work(d);
 407
 408         return 0;
 409 }
 410
 411 /*
 412  * the function walks through list of committed locally changes
 413  * and send them to RPC until the pipe is full
 414  */
 415 static void osp_sync_send_new_rpc(struct osp_device *d,
 416                                   struct ptlrpc_request *req)
 417 {
 418         LASSERT(d->opd_syn_rpc_in_flight <= d->opd_syn_max_rpc_in_flight);
 419         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 420
 421         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 422 }
 423
 424 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
 425                                                struct llog_handle *llh,
 426                                                struct llog_rec_hdr *h,
 427                                                ost_cmd_t op,
 428                                                const struct req_format *format)
 429 {
 430         struct ptlrpc_request   *req;
 431         struct ost_body         *body;
 432         struct obd_import       *imp;
 433         int                      rc;
 434
 435         /* Prepare the request */
 436         imp = d->opd_obd->u.cli.cl_import;
 437         LASSERT(imp);
 438         req = ptlrpc_request_alloc(imp, format);
 439         if (req == NULL)
 440                 RETURN(ERR_PTR(-ENOMEM));
 441
 442         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
 443         if (rc) {
 444                 ptlrpc_req_finished(req);
 445                 return ERR_PTR(rc);
 446         }
 447
 448         /*
 449          * this is a trick: to save on memory allocations we put cookie
 450          * into the request, but don't set corresponded flag in o_valid
 451          * so that OST doesn't interpret this cookie. once the request
 452          * is committed on OST we take cookie from the request and cancel
 453          */
 454         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 455         LASSERT(body);
 456         body->oa.o_lcookie.lgc_lgl = llh->lgh_id;
 457         body->oa.o_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 458         body->oa.o_lcookie.lgc_index = h->lrh_index;
 459         CFS_INIT_LIST_HEAD(&req->rq_exp_list);
 460         req->rq_svc_thread = (void *) OSP_JOB_MAGIC;
 461
 462         req->rq_interpret_reply = osp_sync_interpret;
 463         req->rq_commit_cb = osp_sync_request_commit_cb;
 464         req->rq_cb_data = d;
 465
 466         ptlrpc_request_set_replen(req);
 467
 468         return req;
 469 }
 470
 471 static int osp_sync_new_setattr_job(struct osp_device *d,
 472                                     struct llog_handle *llh,
 473                                     struct llog_rec_hdr *h)
 474 {
 475         struct llog_setattr64_rec       *rec = (struct llog_setattr64_rec *)h;
 476         struct ptlrpc_request           *req;
 477         struct ost_body                 *body;
 478
 479         ENTRY;
 480         LASSERT(h->lrh_type == MDS_SETATTR64_REC);
 481
 482         req = osp_sync_new_job(d, llh, h, OST_SETATTR, &RQF_OST_SETATTR);
 483         if (IS_ERR(req))
 484                 RETURN(PTR_ERR(req));
 485
 486         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 487         LASSERT(body);
 488         body->oa.o_oi = rec->lsr_oi;
 489         body->oa.o_uid = rec->lsr_uid;
 490         body->oa.o_gid = rec->lsr_gid;
 491         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
 492                            OBD_MD_FLUID | OBD_MD_FLGID;
 493
 494         osp_sync_send_new_rpc(d, req);
 495         RETURN(0);
 496 }
 497
 498 /* Old records may be in old format, so we handle that too */
 499 static int osp_sync_new_unlink_job(struct osp_device *d,
 500                                    struct llog_handle *llh,
 501                                    struct llog_rec_hdr *h)
 502 {
 503         struct llog_unlink_rec  *rec = (struct llog_unlink_rec *)h;
 504         struct ptlrpc_request   *req;
 505         struct ost_body         *body;
 506
 507         ENTRY;
 508         LASSERT(h->lrh_type == MDS_UNLINK_REC);
 509
 510         req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
 511         if (IS_ERR(req))
 512                 RETURN(PTR_ERR(req));
 513
 514         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 515         LASSERT(body);
 516         ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
 517         ostid_set_id(&body->oa.o_oi, rec->lur_oid);
 518         body->oa.o_misc = rec->lur_count;
 519         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
 520         if (rec->lur_count)
 521                 body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
 522
 523         osp_sync_send_new_rpc(d, req);
 524         RETURN(0);
 525 }
 526
 527 static int osp_sync_new_unlink64_job(struct osp_device *d,
 528                                      struct llog_handle *llh,
 529                                      struct llog_rec_hdr *h)
 530 {
 531         struct llog_unlink64_rec        *rec = (struct llog_unlink64_rec *)h;
 532         struct ptlrpc_request           *req;
 533         struct ost_body                 *body;
 534         int                              rc;
 535
 536         ENTRY;
 537         LASSERT(h->lrh_type == MDS_UNLINK64_REC);
 538
 539         req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
 540         if (IS_ERR(req))
 541                 RETURN(PTR_ERR(req));
 542
 543         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 544         if (body == NULL)
 545                 RETURN(-EFAULT);
 546         rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
 547         if (rc < 0)
 548                 RETURN(rc);
 549         body->oa.o_misc = rec->lur_count;
 550         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID | OBD_MD_FLOBJCOUNT;
 551
 552         osp_sync_send_new_rpc(d, req);
 553         RETURN(0);
 554 }
 555
 556 static int osp_sync_process_record(const struct lu_env *env,
 557                                    struct osp_device *d,
 558                                    struct llog_handle *llh,
 559                                    struct llog_rec_hdr *rec)
 560 {
 561         struct llog_cookie       cookie;
 562         int                      rc = 0;
 563
 564         cookie.lgc_lgl = llh->lgh_id;
 565         cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 566         cookie.lgc_index = rec->lrh_index;
 567
 568         if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
 569                 struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
 570
 571                 /* we're waiting for the record generated by this instance */
 572                 LASSERT(d->opd_syn_prev_done == 0);
 573                 if (!memcmp(&d->opd_syn_generation, &gen->lgr_gen,
 574                             sizeof(gen->lgr_gen))) {
 575                         CDEBUG(D_HA, "processed all old entries\n");
 576                         d->opd_syn_prev_done = 1;
 577                 }
 578
 579                 /* cancel any generation record */
 580                 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
 581                                              1, &cookie);
 582
 583                 return rc;
 584         }
 585
 586         /*
 587          * now we prepare and fill requests to OST, put them on the queue
 588          * and fire after next commit callback
 589          */
 590
 591         /* notice we increment counters before sending RPC, to be consistent
 592          * in RPC interpret callback which may happen very quickly */
 593         spin_lock(&d->opd_syn_lock);
 594         d->opd_syn_rpc_in_flight++;
 595         d->opd_syn_rpc_in_progress++;
 596         spin_unlock(&d->opd_syn_lock);
 597
 598         switch (rec->lrh_type) {
 599         /* case MDS_UNLINK_REC is kept for compatibility */
 600         case MDS_UNLINK_REC:
 601                 rc = osp_sync_new_unlink_job(d, llh, rec);
 602                 break;
 603         case MDS_UNLINK64_REC:
 604                 rc = osp_sync_new_unlink64_job(d, llh, rec);
 605                 break;
 606         case MDS_SETATTR64_REC:
 607                 rc = osp_sync_new_setattr_job(d, llh, rec);
 608                 break;
 609         default:
 610                 CERROR("unknown record type: %x\n", rec->lrh_type);
 611                        rc = -EINVAL;
 612                        break;
 613         }
 614
 615         if (likely(rc == 0)) {
 616                 spin_lock(&d->opd_syn_lock);
 617                 if (d->opd_syn_prev_done) {
 618                         LASSERT(d->opd_syn_changes > 0);
 619                         LASSERT(rec->lrh_id <= d->opd_syn_last_committed_id);
 620                         /*
 621                          * NOTE: it's possible to meet same id if
 622                          * OST stores few stripes of same file
 623                          */
 624                         if (rec->lrh_id > d->opd_syn_last_processed_id)
 625                                 d->opd_syn_last_processed_id = rec->lrh_id;
 626
 627                         d->opd_syn_changes--;
 628                 }
 629                 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 630                        d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 631                        d->opd_syn_rpc_in_progress);
 632                 spin_unlock(&d->opd_syn_lock);
 633         } else {
 634                 spin_lock(&d->opd_syn_lock);
 635                 d->opd_syn_rpc_in_flight--;
 636                 d->opd_syn_rpc_in_progress--;
 637                 spin_unlock(&d->opd_syn_lock);
 638         }
 639
 640         CDEBUG(D_HA, "found record %x, %d, idx %u, id %u: %d\n",
 641                rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id, rc);
 642         return rc;
 643 }
 644
 645 static void osp_sync_process_committed(const struct lu_env *env,
 646                                        struct osp_device *d)
 647 {
 648         struct obd_device       *obd = d->opd_obd;
 649         struct obd_import       *imp = obd->u.cli.cl_import;
 650         struct ost_body         *body;
 651         struct ptlrpc_request   *req, *tmp;
 652         struct llog_ctxt        *ctxt;
 653         struct llog_handle      *llh;
 654         cfs_list_t               list;
 655         int                      rc, done = 0;
 656
 657         ENTRY;
 658
 659         if (cfs_list_empty(&d->opd_syn_committed_there))
 660                 return;
 661
 662         /*
 663          * if current status is -ENOSPC (lack of free space on OST)
 664          * then we should poll OST immediately once object destroy
 665          * is committed.
 666          * notice: we do this upon commit as well because some backends
 667          * (like DMU) do not release space right away.
 668          */
 669         LASSERT(d->opd_pre != NULL);
 670         if (unlikely(d->opd_pre_status == -ENOSPC))
 671                 osp_statfs_need_now(d);
 672
 673         /*
 674          * now cancel them all
 675          * XXX: can we improve this using some batching?
 676          *      with batch RPC that'll happen automatically?
 677          * XXX: can we store ctxt in lod_device and save few cycles ?
 678          */
 679         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 680         LASSERT(ctxt);
 681
 682         llh = ctxt->loc_handle;
 683         LASSERT(llh);
 684
 685         CFS_INIT_LIST_HEAD(&list);
 686         spin_lock(&d->opd_syn_lock);
 687         cfs_list_splice(&d->opd_syn_committed_there, &list);
 688         CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
 689         spin_unlock(&d->opd_syn_lock);
 690
 691         cfs_list_for_each_entry_safe(req, tmp, &list, rq_exp_list) {
 692                 LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 693                 cfs_list_del_init(&req->rq_exp_list);
 694
 695                 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 696                 LASSERT(body);
 697
 698                 /* import can be closing, thus all commit cb's are
 699                  * called we can check committness directly */
 700                 if (req->rq_transno <= imp->imp_peer_committed_transno) {
 701                         rc = llog_cat_cancel_records(env, llh, 1,
 702                                                      &body->oa.o_lcookie);
 703                         if (rc)
 704                                 CERROR("%s: can't cancel record: %d\n",
 705                                        obd->obd_name, rc);
 706                 } else {
 707                         DEBUG_REQ(D_HA, req, "not committed");
 708                 }
 709
 710                 ptlrpc_req_finished(req);
 711                 done++;
 712         }
 713
 714         llog_ctxt_put(ctxt);
 715
 716         LASSERT(d->opd_syn_rpc_in_progress >= done);
 717         spin_lock(&d->opd_syn_lock);
 718         d->opd_syn_rpc_in_progress -= done;
 719         spin_unlock(&d->opd_syn_lock);
 720         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 721                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 722                d->opd_syn_rpc_in_progress);
 723
 724         osp_sync_check_for_work(d);
 725
 726         /* wake up the thread if requested to stop:
 727          * it might be waiting for in-progress to complete */
 728         if (unlikely(osp_sync_running(d) == 0))
 729                 wake_up(&d->opd_syn_waitq);
 730
 731         EXIT;
 732 }
 733
 734 /*
 735  * this is where most of queues processing happens
 736  */
 737 static int osp_sync_process_queues(const struct lu_env *env,
 738                                    struct llog_handle *llh,
 739                                    struct llog_rec_hdr *rec,
 740                                    void *data)
 741 {
 742         struct osp_device       *d = data;
 743         int                      rc;
 744
 745         do {
 746                 struct l_wait_info lwi = { 0 };
 747
 748                 if (!osp_sync_running(d)) {
 749                         CDEBUG(D_HA, "stop llog processing\n");
 750                         return LLOG_PROC_BREAK;
 751                 }
 752
 753                 /* process requests committed by OST */
 754                 osp_sync_process_committed(env, d);
 755
 756                 /* if we there are changes to be processed and we have
 757                  * resources for this ... do now */
 758                 if (osp_sync_can_process_new(d, rec)) {
 759                         if (llh == NULL) {
 760                                 /* ask llog for another record */
 761                                 CDEBUG(D_HA, "%lu changes, %u in progress, %u in flight\n",
 762                                        d->opd_syn_changes,
 763                                        d->opd_syn_rpc_in_progress,
 764                                        d->opd_syn_rpc_in_flight);
 765                                 return 0;
 766                         }
 767
 768                         /*
 769                          * try to send, in case of disconnection, suspend
 770                          * processing till we can send this request
 771                          */
 772                         do {
 773                                 rc = osp_sync_process_record(env, d, llh, rec);
 774                                 /*
 775                                  * XXX: probably different handling is needed
 776                                  * for some bugs, like immediate exit or if
 777                                  * OSP gets inactive
 778                                  */
 779                                 if (rc) {
 780                                         CERROR("can't send: %d\n", rc);
 781                                         l_wait_event(d->opd_syn_waitq,
 782                                                      !osp_sync_running(d) ||
 783                                                      osp_sync_has_work(d),
 784                                                      &lwi);
 785                                 }
 786                         } while (rc != 0 && osp_sync_running(d));
 787
 788                         llh = NULL;
 789                         rec = NULL;
 790                 }
 791
 792                 if (d->opd_syn_last_processed_id == d->opd_syn_last_used_id)
 793                         osp_sync_remove_from_tracker(d);
 794
 795                 l_wait_event(d->opd_syn_waitq,
 796                              !osp_sync_running(d) ||
 797                              osp_sync_can_process_new(d, rec) ||
 798                              !cfs_list_empty(&d->opd_syn_committed_there),
 799                              &lwi);
 800         } while (1);
 801 }
 802
 803 /*
 804  * this thread runs llog_cat_process() scanner calling our callback
 805  * to process llog records. in the callback we implement tricky
 806  * state machine as we don't want to start scanning of the llog again
 807  * and again, also we don't want to process too many records and send
 808  * too many RPCs a time. so, depending on current load (num of changes
 809  * being synced to OST) the callback can suspend awaiting for some
 810  * new conditions, like syncs completed.
 811  *
 812  * in order to process llog records left by previous boots and to allow
 813  * llog_process_thread() to find something (otherwise it'd just exit
 814  * immediately) we add a special GENERATATION record on each boot.
 815  */
 816 static int osp_sync_thread(void *_arg)
 817 {
 818         struct osp_device       *d = _arg;
 819         struct ptlrpc_thread    *thread = &d->opd_syn_thread;
 820         struct l_wait_info       lwi = { 0 };
 821         struct llog_ctxt        *ctxt;
 822         struct obd_device       *obd = d->opd_obd;
 823         struct llog_handle      *llh;
 824         struct lu_env            env;
 825         int                      rc, count;
 826
 827         ENTRY;
 828
 829         rc = lu_env_init(&env, LCT_LOCAL);
 830         if (rc) {
 831                 CERROR("%s: can't initialize env: rc = %d\n",
 832                        obd->obd_name, rc);
 833                 RETURN(rc);
 834         }
 835
 836         spin_lock(&d->opd_syn_lock);
 837         thread->t_flags = SVC_RUNNING;
 838         spin_unlock(&d->opd_syn_lock);
 839         wake_up(&thread->t_ctl_waitq);
 840
 841         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 842         if (ctxt == NULL) {
 843                 CERROR("can't get appropriate context\n");
 844                 GOTO(out, rc = -EINVAL);
 845         }
 846
 847         llh = ctxt->loc_handle;
 848         if (llh == NULL) {
 849                 CERROR("can't get llh\n");
 850                 llog_ctxt_put(ctxt);
 851                 GOTO(out, rc = -EINVAL);
 852         }
 853
 854         rc = llog_cat_process(&env, llh, osp_sync_process_queues, d, 0, 0);
 855         LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
 856                  "%lu changes, %u in progress, %u in flight: %d\n",
 857                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 858                  d->opd_syn_rpc_in_flight, rc);
 859
 860         /* we don't expect llog_process_thread() to exit till umount */
 861         LASSERTF(thread->t_flags != SVC_RUNNING,
 862                  "%lu changes, %u in progress, %u in flight\n",
 863                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 864                  d->opd_syn_rpc_in_flight);
 865
 866         /* wait till all the requests are completed */
 867         count = 0;
 868         while (d->opd_syn_rpc_in_progress > 0) {
 869                 osp_sync_process_committed(&env, d);
 870
 871                 lwi = LWI_TIMEOUT(cfs_time_seconds(5), NULL, NULL);
 872                 rc = l_wait_event(d->opd_syn_waitq,
 873                                   d->opd_syn_rpc_in_progress == 0,
 874                                   &lwi);
 875                 if (rc == -ETIMEDOUT)
 876                         count++;
 877                 LASSERTF(count < 10, "%s: %d %d %sempty\n",
 878                          d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 879                          d->opd_syn_rpc_in_flight,
 880                          cfs_list_empty(&d->opd_syn_committed_there) ? "" :"!");
 881
 882         }
 883
 884         llog_cat_close(&env, llh);
 885         rc = llog_cleanup(&env, ctxt);
 886         if (rc)
 887                 CERROR("can't cleanup llog: %d\n", rc);
 888 out:
 889         LASSERTF(d->opd_syn_rpc_in_progress == 0,
 890                  "%s: %d %d %sempty\n",
 891                  d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 892                  d->opd_syn_rpc_in_flight,
 893                  cfs_list_empty(&d->opd_syn_committed_there) ? "" : "!");
 894
 895         thread->t_flags = SVC_STOPPED;
 896
 897         wake_up(&thread->t_ctl_waitq);
 898
 899         lu_env_fini(&env);
 900
 901         RETURN(0);
 902 }
 903
 904 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
 905 {
 906         struct osp_thread_info *osi = osp_env_info(env);
 907         struct llog_handle     *lgh = NULL;
 908         struct obd_device      *obd = d->opd_obd;
 909         struct llog_ctxt       *ctxt;
 910         int                     rc;
 911
 912         ENTRY;
 913
 914         LASSERT(obd);
 915
 916         /*
 917          * open llog corresponding to our OST
 918          */
 919         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
 920         obd->obd_lvfs_ctxt.dt = d->opd_storage;
 921
 922         rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
 923                                    &osi->osi_cid);
 924         if (rc) {
 925                 CERROR("%s: can't get id from catalogs: rc = %d\n",
 926                        obd->obd_name, rc);
 927                 RETURN(rc);
 928         }
 929
 930         CDEBUG(D_INFO, "%s: Init llog for %d - catid "DOSTID":%x\n",
 931                obd->obd_name, d->opd_index,
 932                POSTID(&osi->osi_cid.lci_logid.lgl_oi),
 933                osi->osi_cid.lci_logid.lgl_ogen);
 934
 935         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, obd,
 936                         &osp_mds_ost_orig_logops);
 937         if (rc)
 938                 RETURN(rc);
 939
 940         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 941         LASSERT(ctxt);
 942
 943         if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
 944                 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid, NULL,
 945                                LLOG_OPEN_EXISTS);
 946                 /* re-create llog if it is missing */
 947                 if (rc == -ENOENT)
 948                         logid_set_id(&osi->osi_cid.lci_logid, 0);
 949                 else if (rc < 0)
 950                         GOTO(out_cleanup, rc);
 951         }
 952
 953         if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
 954                 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
 955                 if (rc < 0)
 956                         GOTO(out_cleanup, rc);
 957                 osi->osi_cid.lci_logid = lgh->lgh_id;
 958         }
 959
 960         LASSERT(lgh != NULL);
 961         ctxt->loc_handle = lgh;
 962
 963         rc = llog_cat_init_and_process(env, lgh);
 964         if (rc)
 965                 GOTO(out_close, rc);
 966
 967         rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
 968                                    &osi->osi_cid);
 969         if (rc)
 970                 GOTO(out_close, rc);
 971
 972         /*
 973          * put a mark in the llog till which we'll be processing
 974          * old records restless
 975          */
 976         d->opd_syn_generation.mnt_cnt = cfs_time_current();
 977         d->opd_syn_generation.conn_cnt = cfs_time_current();
 978
 979         osi->osi_hdr.lrh_type = LLOG_GEN_REC;
 980         osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
 981
 982         memcpy(&osi->osi_gen.lgr_gen, &d->opd_syn_generation,
 983                sizeof(osi->osi_gen.lgr_gen));
 984
 985         rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie,
 986                           NULL);
 987         if (rc < 0)
 988                 GOTO(out_close, rc);
 989         llog_ctxt_put(ctxt);
 990         RETURN(0);
 991 out_close:
 992         llog_cat_close(env, lgh);
 993 out_cleanup:
 994         llog_cleanup(env, ctxt);
 995         RETURN(rc);
 996 }
 997
 998 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
 999 {
1000         struct llog_ctxt *ctxt;
1001
1002         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1003         if (ctxt != NULL)
1004                 llog_cat_close(env, ctxt->loc_handle);
1005         llog_cleanup(env, ctxt);
1006 }
1007
1008 /*
1009  * initializes sync component of OSP
1010  */
1011 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1012 {
1013         struct l_wait_info       lwi = { 0 };
1014         int                      rc;
1015
1016         ENTRY;
1017
1018         rc = osp_sync_id_traction_init(d);
1019         if (rc)
1020                 RETURN(rc);
1021
1022         /*
1023          * initialize llog storing changes
1024          */
1025         rc = osp_sync_llog_init(env, d);
1026         if (rc) {
1027                 CERROR("%s: can't initialize llog: rc = %d\n",
1028                        d->opd_obd->obd_name, rc);
1029                 GOTO(err_id, rc);
1030         }
1031
1032         /*
1033          * Start synchronization thread
1034          */
1035         d->opd_syn_max_rpc_in_flight = OSP_MAX_IN_FLIGHT;
1036         d->opd_syn_max_rpc_in_progress = OSP_MAX_IN_PROGRESS;
1037         spin_lock_init(&d->opd_syn_lock);
1038         init_waitqueue_head(&d->opd_syn_waitq);
1039         init_waitqueue_head(&d->opd_syn_thread.t_ctl_waitq);
1040         CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
1041
1042         rc = PTR_ERR(kthread_run(osp_sync_thread, d,
1043                                  "osp-syn-%u-%u", d->opd_index, d->opd_group));
1044         if (IS_ERR_VALUE(rc)) {
1045                 CERROR("%s: can't start sync thread: rc = %d\n",
1046                        d->opd_obd->obd_name, rc);
1047                 GOTO(err_llog, rc);
1048         }
1049
1050         l_wait_event(d->opd_syn_thread.t_ctl_waitq,
1051                      osp_sync_running(d) || osp_sync_stopped(d), &lwi);
1052
1053         RETURN(0);
1054 err_llog:
1055         osp_sync_llog_fini(env, d);
1056 err_id:
1057         osp_sync_id_traction_fini(d);
1058         return rc;
1059 }
1060
1061 int osp_sync_fini(struct osp_device *d)
1062 {
1063         struct ptlrpc_thread *thread = &d->opd_syn_thread;
1064
1065         ENTRY;
1066
1067         thread->t_flags = SVC_STOPPING;
1068         wake_up(&d->opd_syn_waitq);
1069         wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1070
1071         /*
1072          * unregister transaction callbacks only when sync thread
1073          * has finished operations with llog
1074          */
1075         osp_sync_id_traction_fini(d);
1076
1077         RETURN(0);
1078 }
1079
1080 static DEFINE_MUTEX(osp_id_tracker_sem);
1081 static CFS_LIST_HEAD(osp_id_tracker_list);
1082
1083 static void osp_sync_tracker_commit_cb(struct thandle *th, void *cookie)
1084 {
1085         struct osp_id_tracker   *tr = cookie;
1086         struct osp_device       *d;
1087         struct osp_txn_info     *txn;
1088
1089         LASSERT(tr);
1090
1091         txn = osp_txn_info(&th->th_ctx);
1092         if (txn == NULL || txn->oti_current_id < tr->otr_committed_id)
1093                 return;
1094
1095         spin_lock(&tr->otr_lock);
1096         if (likely(txn->oti_current_id > tr->otr_committed_id)) {
1097                 CDEBUG(D_OTHER, "committed: %u -> %u\n",
1098                        tr->otr_committed_id, txn->oti_current_id);
1099                 tr->otr_committed_id = txn->oti_current_id;
1100
1101                 cfs_list_for_each_entry(d, &tr->otr_wakeup_list,
1102                                         opd_syn_ontrack) {
1103                         d->opd_syn_last_committed_id = tr->otr_committed_id;
1104                         wake_up(&d->opd_syn_waitq);
1105                 }
1106         }
1107         spin_unlock(&tr->otr_lock);
1108 }
1109
1110 static int osp_sync_id_traction_init(struct osp_device *d)
1111 {
1112         struct osp_id_tracker   *tr, *found = NULL;
1113         int                      rc = 0;
1114
1115         LASSERT(d);
1116         LASSERT(d->opd_storage);
1117         LASSERT(d->opd_syn_tracker == NULL);
1118         CFS_INIT_LIST_HEAD(&d->opd_syn_ontrack);
1119
1120         mutex_lock(&osp_id_tracker_sem);
1121         cfs_list_for_each_entry(tr, &osp_id_tracker_list, otr_list) {
1122                 if (tr->otr_dev == d->opd_storage) {
1123                         LASSERT(cfs_atomic_read(&tr->otr_refcount));
1124                         cfs_atomic_inc(&tr->otr_refcount);
1125                         d->opd_syn_tracker = tr;
1126                         found = tr;
1127                         break;
1128                 }
1129         }
1130
1131         if (found == NULL) {
1132                 rc = -ENOMEM;
1133                 OBD_ALLOC_PTR(tr);
1134                 if (tr) {
1135                         d->opd_syn_tracker = tr;
1136                         spin_lock_init(&tr->otr_lock);
1137                         tr->otr_dev = d->opd_storage;
1138                         tr->otr_next_id = 1;
1139                         tr->otr_committed_id = 0;
1140                         cfs_atomic_set(&tr->otr_refcount, 1);
1141                         CFS_INIT_LIST_HEAD(&tr->otr_wakeup_list);
1142                         cfs_list_add(&tr->otr_list, &osp_id_tracker_list);
1143                         tr->otr_tx_cb.dtc_txn_commit =
1144                                                 osp_sync_tracker_commit_cb;
1145                         tr->otr_tx_cb.dtc_cookie = tr;
1146                         tr->otr_tx_cb.dtc_tag = LCT_MD_THREAD;
1147                         dt_txn_callback_add(d->opd_storage, &tr->otr_tx_cb);
1148                         rc = 0;
1149                 }
1150         }
1151         mutex_unlock(&osp_id_tracker_sem);
1152
1153         return rc;
1154 }
1155
1156 static void osp_sync_id_traction_fini(struct osp_device *d)
1157 {
1158         struct osp_id_tracker *tr;
1159
1160         ENTRY;
1161
1162         LASSERT(d);
1163         tr = d->opd_syn_tracker;
1164         if (tr == NULL) {
1165                 EXIT;
1166                 return;
1167         }
1168
1169         osp_sync_remove_from_tracker(d);
1170
1171         mutex_lock(&osp_id_tracker_sem);
1172         if (cfs_atomic_dec_and_test(&tr->otr_refcount)) {
1173                 dt_txn_callback_del(d->opd_storage, &tr->otr_tx_cb);
1174                 LASSERT(cfs_list_empty(&tr->otr_wakeup_list));
1175                 cfs_list_del(&tr->otr_list);
1176                 OBD_FREE_PTR(tr);
1177                 d->opd_syn_tracker = NULL;
1178         }
1179         mutex_unlock(&osp_id_tracker_sem);
1180
1181         EXIT;
1182 }
1183
1184 /*
1185  * generates id for the tracker
1186  */
1187 static __u32 osp_sync_id_get(struct osp_device *d, __u32 id)
1188 {
1189         struct osp_id_tracker *tr;
1190
1191         tr = d->opd_syn_tracker;
1192         LASSERT(tr);
1193
1194         /* XXX: we can improve this introducing per-cpu preallocated ids? */
1195         spin_lock(&tr->otr_lock);
1196         if (unlikely(tr->otr_next_id <= d->opd_syn_last_used_id)) {
1197                 spin_unlock(&tr->otr_lock);
1198                 CERROR("%s: next %u, last synced %lu\n",
1199                        d->opd_obd->obd_name, tr->otr_next_id,
1200                        d->opd_syn_last_used_id);
1201                 LBUG();
1202         }
1203
1204         if (id == 0)
1205                 id = tr->otr_next_id++;
1206         if (id > d->opd_syn_last_used_id)
1207                 d->opd_syn_last_used_id = id;
1208         if (cfs_list_empty(&d->opd_syn_ontrack))
1209                 cfs_list_add(&d->opd_syn_ontrack, &tr->otr_wakeup_list);
1210         spin_unlock(&tr->otr_lock);
1211         CDEBUG(D_OTHER, "new id %u\n", (unsigned) id);
1212
1213         return id;
1214 }
1215
1216 static void osp_sync_remove_from_tracker(struct osp_device *d)
1217 {
1218         struct osp_id_tracker *tr;
1219
1220         tr = d->opd_syn_tracker;
1221         LASSERT(tr);
1222
1223         if (cfs_list_empty(&d->opd_syn_ontrack))
1224                 return;
1225
1226         spin_lock(&tr->otr_lock);
1227         cfs_list_del_init(&d->opd_syn_ontrack);
1228         spin_unlock(&tr->otr_lock);
1229 }
1230