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                atomic_read(&req->rq_refcount),
 348                rc, (unsigned) req->rq_transno);
 349         LASSERT(rc || req->rq_transno);
 350
 351         if (rc == -ENOENT) {
 352                 /*
 353                  * we tried to destroy object or update attributes,
 354                  * but object doesn't exist anymore - cancell llog record
 355                  */
 356                 LASSERT(req->rq_transno == 0);
 357                 LASSERT(cfs_list_empty(&req->rq_exp_list));
 358
 359                 ptlrpc_request_addref(req);
 360
 361                 spin_lock(&d->opd_syn_lock);
 362                 cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 363                 spin_unlock(&d->opd_syn_lock);
 364
 365                 wake_up(&d->opd_syn_waitq);
 366         } else if (rc) {
 367                 struct obd_import *imp = req->rq_import;
 368                 /*
 369                  * error happened, we'll try to repeat on next boot ?
 370                  */
 371                 LASSERTF(req->rq_transno == 0 ||
 372                          req->rq_import_generation < imp->imp_generation,
 373                          "transno "LPU64", rc %d, gen: req %d, imp %d\n",
 374                          req->rq_transno, rc, req->rq_import_generation,
 375                          imp->imp_generation);
 376                 if (req->rq_transno == 0) {
 377                         /* this is the last time we see the request
 378                          * if transno is not zero, then commit cb
 379                          * will be called at some point */
 380                         LASSERT(d->opd_syn_rpc_in_progress > 0);
 381                         spin_lock(&d->opd_syn_lock);
 382                         d->opd_syn_rpc_in_progress--;
 383                         spin_unlock(&d->opd_syn_lock);
 384                 }
 385
 386                 wake_up(&d->opd_syn_waitq);
 387         } else if (d->opd_pre != NULL &&
 388                    unlikely(d->opd_pre_status == -ENOSPC)) {
 389                 /*
 390                  * if current status is -ENOSPC (lack of free space on OST)
 391                  * then we should poll OST immediately once object destroy
 392                  * is replied
 393                  */
 394                 osp_statfs_need_now(d);
 395         }
 396
 397         LASSERT(d->opd_syn_rpc_in_flight > 0);
 398         spin_lock(&d->opd_syn_lock);
 399         d->opd_syn_rpc_in_flight--;
 400         spin_unlock(&d->opd_syn_lock);
 401         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 402                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 403                d->opd_syn_rpc_in_progress);
 404
 405         osp_sync_check_for_work(d);
 406
 407         return 0;
 408 }
 409
 410 /*
 411  * the function walks through list of committed locally changes
 412  * and send them to RPC until the pipe is full
 413  */
 414 static void osp_sync_send_new_rpc(struct osp_device *d,
 415                                   struct ptlrpc_request *req)
 416 {
 417         LASSERT(d->opd_syn_rpc_in_flight <= d->opd_syn_max_rpc_in_flight);
 418         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 419
 420         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 421 }
 422
 423 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
 424                                                struct llog_handle *llh,
 425                                                struct llog_rec_hdr *h,
 426                                                ost_cmd_t op,
 427                                                const struct req_format *format)
 428 {
 429         struct ptlrpc_request   *req;
 430         struct ost_body         *body;
 431         struct obd_import       *imp;
 432         int                      rc;
 433
 434         /* Prepare the request */
 435         imp = d->opd_obd->u.cli.cl_import;
 436         LASSERT(imp);
 437         req = ptlrpc_request_alloc(imp, format);
 438         if (req == NULL)
 439                 RETURN(ERR_PTR(-ENOMEM));
 440
 441         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
 442         if (rc) {
 443                 ptlrpc_req_finished(req);
 444                 return ERR_PTR(rc);
 445         }
 446
 447         /*
 448          * this is a trick: to save on memory allocations we put cookie
 449          * into the request, but don't set corresponded flag in o_valid
 450          * so that OST doesn't interpret this cookie. once the request
 451          * is committed on OST we take cookie from the request and cancel
 452          */
 453         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 454         LASSERT(body);
 455         body->oa.o_lcookie.lgc_lgl = llh->lgh_id;
 456         body->oa.o_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 457         body->oa.o_lcookie.lgc_index = h->lrh_index;
 458         CFS_INIT_LIST_HEAD(&req->rq_exp_list);
 459         req->rq_svc_thread = (void *) OSP_JOB_MAGIC;
 460
 461         req->rq_interpret_reply = osp_sync_interpret;
 462         req->rq_commit_cb = osp_sync_request_commit_cb;
 463         req->rq_cb_data = d;
 464
 465         ptlrpc_request_set_replen(req);
 466
 467         return req;
 468 }
 469
 470 static int osp_sync_new_setattr_job(struct osp_device *d,
 471                                     struct llog_handle *llh,
 472                                     struct llog_rec_hdr *h)
 473 {
 474         struct llog_setattr64_rec       *rec = (struct llog_setattr64_rec *)h;
 475         struct ptlrpc_request           *req;
 476         struct ost_body                 *body;
 477
 478         ENTRY;
 479         LASSERT(h->lrh_type == MDS_SETATTR64_REC);
 480
 481         req = osp_sync_new_job(d, llh, h, OST_SETATTR, &RQF_OST_SETATTR);
 482         if (IS_ERR(req))
 483                 RETURN(PTR_ERR(req));
 484
 485         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 486         LASSERT(body);
 487         body->oa.o_oi = rec->lsr_oi;
 488         body->oa.o_uid = rec->lsr_uid;
 489         body->oa.o_gid = rec->lsr_gid;
 490         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
 491                            OBD_MD_FLUID | OBD_MD_FLGID;
 492
 493         osp_sync_send_new_rpc(d, req);
 494         RETURN(0);
 495 }
 496
 497 /* Old records may be in old format, so we handle that too */
 498 static int osp_sync_new_unlink_job(struct osp_device *d,
 499                                    struct llog_handle *llh,
 500                                    struct llog_rec_hdr *h)
 501 {
 502         struct llog_unlink_rec  *rec = (struct llog_unlink_rec *)h;
 503         struct ptlrpc_request   *req;
 504         struct ost_body         *body;
 505
 506         ENTRY;
 507         LASSERT(h->lrh_type == MDS_UNLINK_REC);
 508
 509         req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
 510         if (IS_ERR(req))
 511                 RETURN(PTR_ERR(req));
 512
 513         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 514         LASSERT(body);
 515         ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
 516         ostid_set_id(&body->oa.o_oi, rec->lur_oid);
 517         body->oa.o_misc = rec->lur_count;
 518         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
 519         if (rec->lur_count)
 520                 body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
 521
 522         osp_sync_send_new_rpc(d, req);
 523         RETURN(0);
 524 }
 525
 526 static int osp_prep_unlink_update_req(const struct lu_env *env,
 527                                       struct osp_device *osp,
 528                                       struct llog_handle *llh,
 529                                       struct llog_rec_hdr *h,
 530                                       struct ptlrpc_request **reqp)
 531 {
 532         struct llog_unlink64_rec        *rec = (struct llog_unlink64_rec *)h;
 533         struct dt_update_request        *update = NULL;
 534         struct ptlrpc_request           *req;
 535         const char                      *buf;
 536         struct llog_cookie              lcookie;
 537         int                             size;
 538         int                             rc;
 539         ENTRY;
 540
 541         update = out_create_update_req(&osp->opd_dt_dev);
 542         if (IS_ERR(update))
 543                 RETURN(PTR_ERR(update));
 544
 545         /* This can only happens for unlink slave directory, so decrease
 546          * ref for ".." and "." */
 547         rc = out_insert_update(env, update, OUT_REF_DEL, &rec->lur_fid, 0,
 548                                NULL, NULL);
 549         if (rc != 0)
 550                 GOTO(out, rc);
 551
 552         rc = out_insert_update(env, update, OUT_REF_DEL, &rec->lur_fid, 0,
 553                                NULL, NULL);
 554         if (rc != 0)
 555                 GOTO(out, rc);
 556
 557         lcookie.lgc_lgl = llh->lgh_id;
 558         lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 559         lcookie.lgc_index = h->lrh_index;
 560         size = sizeof(lcookie);
 561         buf = (const char *)&lcookie;
 562
 563         rc = out_insert_update(env, update, OUT_DESTROY, &rec->lur_fid, 1,
 564                                &size, &buf);
 565         if (rc != 0)
 566                 GOTO(out, rc);
 567
 568         rc = out_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
 569                                  update->dur_req, &req);
 570         if (rc != 0)
 571                 GOTO(out, rc);
 572
 573         INIT_LIST_HEAD(&req->rq_exp_list);
 574         req->rq_svc_thread = (void *)OSP_JOB_MAGIC;
 575
 576         req->rq_interpret_reply = osp_sync_interpret;
 577         req->rq_commit_cb = osp_sync_request_commit_cb;
 578         req->rq_cb_data = osp;
 579
 580         ptlrpc_request_set_replen(req);
 581         *reqp = req;
 582 out:
 583         if (update != NULL)
 584                 out_destroy_update_req(update);
 585
 586         RETURN(rc);
 587 }
 588
 589 static int osp_sync_new_unlink64_job(const struct lu_env *env,
 590                                      struct osp_device *d,
 591                                      struct llog_handle *llh,
 592                                      struct llog_rec_hdr *h)
 593 {
 594         struct llog_unlink64_rec        *rec = (struct llog_unlink64_rec *)h;
 595         struct ptlrpc_request           *req = NULL;
 596         struct ost_body                 *body;
 597         int                              rc;
 598
 599         ENTRY;
 600         LASSERT(h->lrh_type == MDS_UNLINK64_REC);
 601
 602         if (d->opd_connect_mdt) {
 603                 rc = osp_prep_unlink_update_req(env, d, llh, h, &req);
 604                 if (rc != 0)
 605                         RETURN(rc);
 606         } else {
 607                 req = osp_sync_new_job(d, llh, h, OST_DESTROY,
 608                                        &RQF_OST_DESTROY);
 609                 if (IS_ERR(req))
 610                         RETURN(PTR_ERR(req));
 611
 612                 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 613                 if (body == NULL)
 614                         RETURN(-EFAULT);
 615                 rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
 616                 if (rc < 0)
 617                         RETURN(rc);
 618                 body->oa.o_misc = rec->lur_count;
 619                 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
 620                                    OBD_MD_FLOBJCOUNT;
 621         }
 622         osp_sync_send_new_rpc(d, req);
 623         RETURN(0);
 624 }
 625
 626 static int osp_sync_process_record(const struct lu_env *env,
 627                                    struct osp_device *d,
 628                                    struct llog_handle *llh,
 629                                    struct llog_rec_hdr *rec)
 630 {
 631         struct llog_cookie       cookie;
 632         int                      rc = 0;
 633
 634         cookie.lgc_lgl = llh->lgh_id;
 635         cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 636         cookie.lgc_index = rec->lrh_index;
 637
 638         if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
 639                 struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
 640
 641                 /* we're waiting for the record generated by this instance */
 642                 LASSERT(d->opd_syn_prev_done == 0);
 643                 if (!memcmp(&d->opd_syn_generation, &gen->lgr_gen,
 644                             sizeof(gen->lgr_gen))) {
 645                         CDEBUG(D_HA, "processed all old entries\n");
 646                         d->opd_syn_prev_done = 1;
 647                 }
 648
 649                 /* cancel any generation record */
 650                 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
 651                                              1, &cookie);
 652
 653                 return rc;
 654         }
 655
 656         /*
 657          * now we prepare and fill requests to OST, put them on the queue
 658          * and fire after next commit callback
 659          */
 660
 661         /* notice we increment counters before sending RPC, to be consistent
 662          * in RPC interpret callback which may happen very quickly */
 663         spin_lock(&d->opd_syn_lock);
 664         d->opd_syn_rpc_in_flight++;
 665         d->opd_syn_rpc_in_progress++;
 666         spin_unlock(&d->opd_syn_lock);
 667
 668         switch (rec->lrh_type) {
 669         /* case MDS_UNLINK_REC is kept for compatibility */
 670         case MDS_UNLINK_REC:
 671                 rc = osp_sync_new_unlink_job(d, llh, rec);
 672                 break;
 673         case MDS_UNLINK64_REC:
 674                 rc = osp_sync_new_unlink64_job(env, d, llh, rec);
 675                 break;
 676         case MDS_SETATTR64_REC:
 677                 rc = osp_sync_new_setattr_job(d, llh, rec);
 678                 break;
 679         default:
 680                 CERROR("%s: unknown record type: %x\n", d->opd_obd->obd_name,
 681                        rec->lrh_type);
 682                 /* we should continue processing */
 683                 return 0;
 684         }
 685
 686         if (likely(rc == 0)) {
 687                 spin_lock(&d->opd_syn_lock);
 688                 if (d->opd_syn_prev_done) {
 689                         LASSERT(d->opd_syn_changes > 0);
 690                         LASSERT(rec->lrh_id <= d->opd_syn_last_committed_id);
 691                         /*
 692                          * NOTE: it's possible to meet same id if
 693                          * OST stores few stripes of same file
 694                          */
 695                         if (rec->lrh_id > d->opd_syn_last_processed_id)
 696                                 d->opd_syn_last_processed_id = rec->lrh_id;
 697
 698                         d->opd_syn_changes--;
 699                 }
 700                 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 701                        d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 702                        d->opd_syn_rpc_in_progress);
 703                 spin_unlock(&d->opd_syn_lock);
 704         } else {
 705                 spin_lock(&d->opd_syn_lock);
 706                 d->opd_syn_rpc_in_flight--;
 707                 d->opd_syn_rpc_in_progress--;
 708                 spin_unlock(&d->opd_syn_lock);
 709         }
 710
 711         CDEBUG(D_HA, "found record %x, %d, idx %u, id %u: %d\n",
 712                rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id, rc);
 713         return rc;
 714 }
 715
 716 static void osp_sync_process_committed(const struct lu_env *env,
 717                                        struct osp_device *d)
 718 {
 719         struct obd_device       *obd = d->opd_obd;
 720         struct obd_import       *imp = obd->u.cli.cl_import;
 721         struct ost_body         *body;
 722         struct ptlrpc_request   *req, *tmp;
 723         struct llog_ctxt        *ctxt;
 724         struct llog_handle      *llh;
 725         cfs_list_t               list;
 726         int                      rc, done = 0;
 727
 728         ENTRY;
 729
 730         if (cfs_list_empty(&d->opd_syn_committed_there))
 731                 return;
 732
 733         /*
 734          * if current status is -ENOSPC (lack of free space on OST)
 735          * then we should poll OST immediately once object destroy
 736          * is committed.
 737          * notice: we do this upon commit as well because some backends
 738          * (like DMU) do not release space right away.
 739          */
 740         if (d->opd_pre != NULL && unlikely(d->opd_pre_status == -ENOSPC))
 741                 osp_statfs_need_now(d);
 742
 743         /*
 744          * now cancel them all
 745          * XXX: can we improve this using some batching?
 746          *      with batch RPC that'll happen automatically?
 747          * XXX: can we store ctxt in lod_device and save few cycles ?
 748          */
 749         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 750         LASSERT(ctxt);
 751
 752         llh = ctxt->loc_handle;
 753         LASSERT(llh);
 754
 755         CFS_INIT_LIST_HEAD(&list);
 756         spin_lock(&d->opd_syn_lock);
 757         cfs_list_splice(&d->opd_syn_committed_there, &list);
 758         CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
 759         spin_unlock(&d->opd_syn_lock);
 760
 761         cfs_list_for_each_entry_safe(req, tmp, &list, rq_exp_list) {
 762                 struct llog_cookie *lcookie = NULL;
 763
 764                 LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 765                 cfs_list_del_init(&req->rq_exp_list);
 766
 767                 if (d->opd_connect_mdt) {
 768                         struct object_update_request *ureq;
 769                         struct object_update *update;
 770                         ureq = req_capsule_client_get(&req->rq_pill,
 771                                                       &RMF_OUT_UPDATE);
 772                         LASSERT(ureq != NULL &&
 773                                 ureq->ourq_magic == UPDATE_REQUEST_MAGIC);
 774
 775                         /* 1st/2nd is for decref . and .., 3rd one is for
 776                          * destroy, where the log cookie is stored.
 777                          * See osp_prep_unlink_update_req */
 778                         update = object_update_request_get(ureq, 2, NULL);
 779                         LASSERT(update != NULL);
 780                         lcookie = object_update_param_get(update, 0, NULL);
 781                         LASSERT(lcookie != NULL);
 782                 } else {
 783                         body = req_capsule_client_get(&req->rq_pill,
 784                                                       &RMF_OST_BODY);
 785                         LASSERT(body);
 786                         lcookie = &body->oa.o_lcookie;
 787                 }
 788                 /* import can be closing, thus all commit cb's are
 789                  * called we can check committness directly */
 790                 if (req->rq_transno <= imp->imp_peer_committed_transno) {
 791                         rc = llog_cat_cancel_records(env, llh, 1, lcookie);
 792                         if (rc)
 793                                 CERROR("%s: can't cancel record: %d\n",
 794                                        obd->obd_name, rc);
 795                 } else {
 796                         DEBUG_REQ(D_HA, req, "not committed");
 797                 }
 798
 799                 ptlrpc_req_finished(req);
 800                 done++;
 801         }
 802
 803         llog_ctxt_put(ctxt);
 804
 805         LASSERT(d->opd_syn_rpc_in_progress >= done);
 806         spin_lock(&d->opd_syn_lock);
 807         d->opd_syn_rpc_in_progress -= done;
 808         spin_unlock(&d->opd_syn_lock);
 809         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 810                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 811                d->opd_syn_rpc_in_progress);
 812
 813         osp_sync_check_for_work(d);
 814
 815         /* wake up the thread if requested to stop:
 816          * it might be waiting for in-progress to complete */
 817         if (unlikely(osp_sync_running(d) == 0))
 818                 wake_up(&d->opd_syn_waitq);
 819
 820         EXIT;
 821 }
 822
 823 /*
 824  * this is where most of queues processing happens
 825  */
 826 static int osp_sync_process_queues(const struct lu_env *env,
 827                                    struct llog_handle *llh,
 828                                    struct llog_rec_hdr *rec,
 829                                    void *data)
 830 {
 831         struct osp_device       *d = data;
 832         int                      rc;
 833
 834         do {
 835                 struct l_wait_info lwi = { 0 };
 836
 837                 if (!osp_sync_running(d)) {
 838                         CDEBUG(D_HA, "stop llog processing\n");
 839                         return LLOG_PROC_BREAK;
 840                 }
 841
 842                 /* process requests committed by OST */
 843                 osp_sync_process_committed(env, d);
 844
 845                 /* if we there are changes to be processed and we have
 846                  * resources for this ... do now */
 847                 if (osp_sync_can_process_new(d, rec)) {
 848                         if (llh == NULL) {
 849                                 /* ask llog for another record */
 850                                 CDEBUG(D_HA, "%lu changes, %u in progress, %u in flight\n",
 851                                        d->opd_syn_changes,
 852                                        d->opd_syn_rpc_in_progress,
 853                                        d->opd_syn_rpc_in_flight);
 854                                 return 0;
 855                         }
 856
 857                         /*
 858                          * try to send, in case of disconnection, suspend
 859                          * processing till we can send this request
 860                          */
 861                         do {
 862                                 rc = osp_sync_process_record(env, d, llh, rec);
 863                                 /*
 864                                  * XXX: probably different handling is needed
 865                                  * for some bugs, like immediate exit or if
 866                                  * OSP gets inactive
 867                                  */
 868                                 if (rc) {
 869                                         CERROR("can't send: %d\n", rc);
 870                                         l_wait_event(d->opd_syn_waitq,
 871                                                      !osp_sync_running(d) ||
 872                                                      osp_sync_has_work(d),
 873                                                      &lwi);
 874                                 }
 875                         } while (rc != 0 && osp_sync_running(d));
 876
 877                         llh = NULL;
 878                         rec = NULL;
 879                 }
 880
 881                 if (d->opd_syn_last_processed_id == d->opd_syn_last_used_id)
 882                         osp_sync_remove_from_tracker(d);
 883
 884                 l_wait_event(d->opd_syn_waitq,
 885                              !osp_sync_running(d) ||
 886                              osp_sync_can_process_new(d, rec) ||
 887                              !cfs_list_empty(&d->opd_syn_committed_there),
 888                              &lwi);
 889         } while (1);
 890 }
 891
 892 /*
 893  * this thread runs llog_cat_process() scanner calling our callback
 894  * to process llog records. in the callback we implement tricky
 895  * state machine as we don't want to start scanning of the llog again
 896  * and again, also we don't want to process too many records and send
 897  * too many RPCs a time. so, depending on current load (num of changes
 898  * being synced to OST) the callback can suspend awaiting for some
 899  * new conditions, like syncs completed.
 900  *
 901  * in order to process llog records left by previous boots and to allow
 902  * llog_process_thread() to find something (otherwise it'd just exit
 903  * immediately) we add a special GENERATATION record on each boot.
 904  */
 905 static int osp_sync_thread(void *_arg)
 906 {
 907         struct osp_device       *d = _arg;
 908         struct ptlrpc_thread    *thread = &d->opd_syn_thread;
 909         struct l_wait_info       lwi = { 0 };
 910         struct llog_ctxt        *ctxt;
 911         struct obd_device       *obd = d->opd_obd;
 912         struct llog_handle      *llh;
 913         struct lu_env            env;
 914         int                      rc, count;
 915
 916         ENTRY;
 917
 918         rc = lu_env_init(&env, LCT_LOCAL);
 919         if (rc) {
 920                 CERROR("%s: can't initialize env: rc = %d\n",
 921                        obd->obd_name, rc);
 922                 RETURN(rc);
 923         }
 924
 925         spin_lock(&d->opd_syn_lock);
 926         thread->t_flags = SVC_RUNNING;
 927         spin_unlock(&d->opd_syn_lock);
 928         wake_up(&thread->t_ctl_waitq);
 929
 930         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 931         if (ctxt == NULL) {
 932                 CERROR("can't get appropriate context\n");
 933                 GOTO(out, rc = -EINVAL);
 934         }
 935
 936         llh = ctxt->loc_handle;
 937         if (llh == NULL) {
 938                 CERROR("can't get llh\n");
 939                 llog_ctxt_put(ctxt);
 940                 GOTO(out, rc = -EINVAL);
 941         }
 942
 943         rc = llog_cat_process(&env, llh, osp_sync_process_queues, d, 0, 0);
 944         LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
 945                  "%lu changes, %u in progress, %u in flight: %d\n",
 946                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 947                  d->opd_syn_rpc_in_flight, rc);
 948
 949         /* we don't expect llog_process_thread() to exit till umount */
 950         LASSERTF(thread->t_flags != SVC_RUNNING,
 951                  "%lu changes, %u in progress, %u in flight\n",
 952                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 953                  d->opd_syn_rpc_in_flight);
 954
 955         /* wait till all the requests are completed */
 956         count = 0;
 957         while (d->opd_syn_rpc_in_progress > 0) {
 958                 osp_sync_process_committed(&env, d);
 959
 960                 lwi = LWI_TIMEOUT(cfs_time_seconds(5), NULL, NULL);
 961                 rc = l_wait_event(d->opd_syn_waitq,
 962                                   d->opd_syn_rpc_in_progress == 0,
 963                                   &lwi);
 964                 if (rc == -ETIMEDOUT)
 965                         count++;
 966                 LASSERTF(count < 10, "%s: %d %d %sempty\n",
 967                          d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 968                          d->opd_syn_rpc_in_flight,
 969                          cfs_list_empty(&d->opd_syn_committed_there) ? "" :"!");
 970
 971         }
 972
 973         llog_cat_close(&env, llh);
 974         rc = llog_cleanup(&env, ctxt);
 975         if (rc)
 976                 CERROR("can't cleanup llog: %d\n", rc);
 977 out:
 978         LASSERTF(d->opd_syn_rpc_in_progress == 0,
 979                  "%s: %d %d %sempty\n",
 980                  d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 981                  d->opd_syn_rpc_in_flight,
 982                  cfs_list_empty(&d->opd_syn_committed_there) ? "" : "!");
 983
 984         thread->t_flags = SVC_STOPPED;
 985
 986         wake_up(&thread->t_ctl_waitq);
 987
 988         lu_env_fini(&env);
 989
 990         RETURN(0);
 991 }
 992
 993 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
 994 {
 995         struct osp_thread_info  *osi = osp_env_info(env);
 996         struct lu_fid           *fid = &osi->osi_fid;
 997         struct llog_handle      *lgh = NULL;
 998         struct obd_device       *obd = d->opd_obd;
 999         struct llog_ctxt        *ctxt;
1000         int                     rc;
1001
1002         ENTRY;
1003
1004         LASSERT(obd);
1005
1006         /*
1007          * open llog corresponding to our OST
1008          */
1009         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1010         obd->obd_lvfs_ctxt.dt = d->opd_storage;
1011
1012         if (d->opd_connect_mdt)
1013                 lu_local_obj_fid(fid, SLAVE_LLOG_CATALOGS_OID);
1014         else
1015                 lu_local_obj_fid(fid, LLOG_CATALOGS_OID);
1016
1017         rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
1018                                    &osi->osi_cid, fid);
1019         if (rc) {
1020                 CERROR("%s: can't get id from catalogs: rc = %d\n",
1021                        obd->obd_name, rc);
1022                 RETURN(rc);
1023         }
1024
1025         CDEBUG(D_INFO, "%s: Init llog for %d - catid "DOSTID":%x\n",
1026                obd->obd_name, d->opd_index,
1027                POSTID(&osi->osi_cid.lci_logid.lgl_oi),
1028                osi->osi_cid.lci_logid.lgl_ogen);
1029
1030         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, obd,
1031                         &osp_mds_ost_orig_logops);
1032         if (rc)
1033                 RETURN(rc);
1034
1035         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1036         LASSERT(ctxt);
1037
1038         if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
1039                 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid, NULL,
1040                                LLOG_OPEN_EXISTS);
1041                 /* re-create llog if it is missing */
1042                 if (rc == -ENOENT)
1043                         logid_set_id(&osi->osi_cid.lci_logid, 0);
1044                 else if (rc < 0)
1045                         GOTO(out_cleanup, rc);
1046         }
1047
1048         if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
1049                 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
1050                 if (rc < 0)
1051                         GOTO(out_cleanup, rc);
1052                 osi->osi_cid.lci_logid = lgh->lgh_id;
1053         }
1054
1055         LASSERT(lgh != NULL);
1056         ctxt->loc_handle = lgh;
1057
1058         rc = llog_cat_init_and_process(env, lgh);
1059         if (rc)
1060                 GOTO(out_close, rc);
1061
1062         rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
1063                                    &osi->osi_cid, fid);
1064         if (rc)
1065                 GOTO(out_close, rc);
1066
1067         /*
1068          * put a mark in the llog till which we'll be processing
1069          * old records restless
1070          */
1071         d->opd_syn_generation.mnt_cnt = cfs_time_current();
1072         d->opd_syn_generation.conn_cnt = cfs_time_current();
1073
1074         osi->osi_hdr.lrh_type = LLOG_GEN_REC;
1075         osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
1076
1077         memcpy(&osi->osi_gen.lgr_gen, &d->opd_syn_generation,
1078                sizeof(osi->osi_gen.lgr_gen));
1079
1080         rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie,
1081                           NULL);
1082         if (rc < 0)
1083                 GOTO(out_close, rc);
1084         llog_ctxt_put(ctxt);
1085         RETURN(0);
1086 out_close:
1087         llog_cat_close(env, lgh);
1088 out_cleanup:
1089         llog_cleanup(env, ctxt);
1090         RETURN(rc);
1091 }
1092
1093 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
1094 {
1095         struct llog_ctxt *ctxt;
1096
1097         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1098         if (ctxt != NULL)
1099                 llog_cat_close(env, ctxt->loc_handle);
1100         llog_cleanup(env, ctxt);
1101 }
1102
1103 /*
1104  * initializes sync component of OSP
1105  */
1106 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1107 {
1108         struct l_wait_info       lwi = { 0 };
1109         struct task_struct      *task;
1110         int                      rc;
1111
1112         ENTRY;
1113
1114         rc = osp_sync_id_traction_init(d);
1115         if (rc)
1116                 RETURN(rc);
1117
1118         /*
1119          * initialize llog storing changes
1120          */
1121         rc = osp_sync_llog_init(env, d);
1122         if (rc) {
1123                 CERROR("%s: can't initialize llog: rc = %d\n",
1124                        d->opd_obd->obd_name, rc);
1125                 GOTO(err_id, rc);
1126         }
1127
1128         /*
1129          * Start synchronization thread
1130          */
1131         d->opd_syn_max_rpc_in_flight = OSP_MAX_IN_FLIGHT;
1132         d->opd_syn_max_rpc_in_progress = OSP_MAX_IN_PROGRESS;
1133         spin_lock_init(&d->opd_syn_lock);
1134         init_waitqueue_head(&d->opd_syn_waitq);
1135         init_waitqueue_head(&d->opd_syn_thread.t_ctl_waitq);
1136         CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
1137
1138         task = kthread_run(osp_sync_thread, d, "osp-syn-%u-%u",
1139                            d->opd_index, d->opd_group);
1140         if (IS_ERR(task)) {
1141                 rc = PTR_ERR(task);
1142                 CERROR("%s: cannot start sync thread: rc = %d\n",
1143                        d->opd_obd->obd_name, rc);
1144                 GOTO(err_llog, rc);
1145         }
1146
1147         l_wait_event(d->opd_syn_thread.t_ctl_waitq,
1148                      osp_sync_running(d) || osp_sync_stopped(d), &lwi);
1149
1150         RETURN(0);
1151 err_llog:
1152         osp_sync_llog_fini(env, d);
1153 err_id:
1154         osp_sync_id_traction_fini(d);
1155         return rc;
1156 }
1157
1158 int osp_sync_fini(struct osp_device *d)
1159 {
1160         struct ptlrpc_thread *thread = &d->opd_syn_thread;
1161
1162         ENTRY;
1163
1164         thread->t_flags = SVC_STOPPING;
1165         wake_up(&d->opd_syn_waitq);
1166         wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1167
1168         /*
1169          * unregister transaction callbacks only when sync thread
1170          * has finished operations with llog
1171          */
1172         osp_sync_id_traction_fini(d);
1173
1174         RETURN(0);
1175 }
1176
1177 static DEFINE_MUTEX(osp_id_tracker_sem);
1178 static CFS_LIST_HEAD(osp_id_tracker_list);
1179
1180 static void osp_sync_tracker_commit_cb(struct thandle *th, void *cookie)
1181 {
1182         struct osp_id_tracker   *tr = cookie;
1183         struct osp_device       *d;
1184         struct osp_txn_info     *txn;
1185
1186         LASSERT(tr);
1187
1188         txn = osp_txn_info(&th->th_ctx);
1189         if (txn == NULL || txn->oti_current_id < tr->otr_committed_id)
1190                 return;
1191
1192         spin_lock(&tr->otr_lock);
1193         if (likely(txn->oti_current_id > tr->otr_committed_id)) {
1194                 CDEBUG(D_OTHER, "committed: %u -> %u\n",
1195                        tr->otr_committed_id, txn->oti_current_id);
1196                 tr->otr_committed_id = txn->oti_current_id;
1197
1198                 cfs_list_for_each_entry(d, &tr->otr_wakeup_list,
1199                                         opd_syn_ontrack) {
1200                         d->opd_syn_last_committed_id = tr->otr_committed_id;
1201                         wake_up(&d->opd_syn_waitq);
1202                 }
1203         }
1204         spin_unlock(&tr->otr_lock);
1205 }
1206
1207 static int osp_sync_id_traction_init(struct osp_device *d)
1208 {
1209         struct osp_id_tracker   *tr, *found = NULL;
1210         int                      rc = 0;
1211
1212         LASSERT(d);
1213         LASSERT(d->opd_storage);
1214         LASSERT(d->opd_syn_tracker == NULL);
1215         CFS_INIT_LIST_HEAD(&d->opd_syn_ontrack);
1216
1217         mutex_lock(&osp_id_tracker_sem);
1218         cfs_list_for_each_entry(tr, &osp_id_tracker_list, otr_list) {
1219                 if (tr->otr_dev == d->opd_storage) {
1220                         LASSERT(atomic_read(&tr->otr_refcount));
1221                         atomic_inc(&tr->otr_refcount);
1222                         d->opd_syn_tracker = tr;
1223                         found = tr;
1224                         break;
1225                 }
1226         }
1227
1228         if (found == NULL) {
1229                 rc = -ENOMEM;
1230                 OBD_ALLOC_PTR(tr);
1231                 if (tr) {
1232                         d->opd_syn_tracker = tr;
1233                         spin_lock_init(&tr->otr_lock);
1234                         tr->otr_dev = d->opd_storage;
1235                         tr->otr_next_id = 1;
1236                         tr->otr_committed_id = 0;
1237                         atomic_set(&tr->otr_refcount, 1);
1238                         CFS_INIT_LIST_HEAD(&tr->otr_wakeup_list);
1239                         cfs_list_add(&tr->otr_list, &osp_id_tracker_list);
1240                         tr->otr_tx_cb.dtc_txn_commit =
1241                                                 osp_sync_tracker_commit_cb;
1242                         tr->otr_tx_cb.dtc_cookie = tr;
1243                         tr->otr_tx_cb.dtc_tag = LCT_MD_THREAD;
1244                         dt_txn_callback_add(d->opd_storage, &tr->otr_tx_cb);
1245                         rc = 0;
1246                 }
1247         }
1248         mutex_unlock(&osp_id_tracker_sem);
1249
1250         return rc;
1251 }
1252
1253 static void osp_sync_id_traction_fini(struct osp_device *d)
1254 {
1255         struct osp_id_tracker *tr;
1256
1257         ENTRY;
1258
1259         LASSERT(d);
1260         tr = d->opd_syn_tracker;
1261         if (tr == NULL) {
1262                 EXIT;
1263                 return;
1264         }
1265
1266         osp_sync_remove_from_tracker(d);
1267
1268         mutex_lock(&osp_id_tracker_sem);
1269         if (atomic_dec_and_test(&tr->otr_refcount)) {
1270                 dt_txn_callback_del(d->opd_storage, &tr->otr_tx_cb);
1271                 LASSERT(cfs_list_empty(&tr->otr_wakeup_list));
1272                 cfs_list_del(&tr->otr_list);
1273                 OBD_FREE_PTR(tr);
1274                 d->opd_syn_tracker = NULL;
1275         }
1276         mutex_unlock(&osp_id_tracker_sem);
1277
1278         EXIT;
1279 }
1280
1281 /*
1282  * generates id for the tracker
1283  */
1284 static __u32 osp_sync_id_get(struct osp_device *d, __u32 id)
1285 {
1286         struct osp_id_tracker *tr;
1287
1288         tr = d->opd_syn_tracker;
1289         LASSERT(tr);
1290
1291         /* XXX: we can improve this introducing per-cpu preallocated ids? */
1292         spin_lock(&tr->otr_lock);
1293         if (unlikely(tr->otr_next_id <= d->opd_syn_last_used_id)) {
1294                 spin_unlock(&tr->otr_lock);
1295                 CERROR("%s: next %u, last synced %lu\n",
1296                        d->opd_obd->obd_name, tr->otr_next_id,
1297                        d->opd_syn_last_used_id);
1298                 LBUG();
1299         }
1300
1301         if (id == 0)
1302                 id = tr->otr_next_id++;
1303         if (id > d->opd_syn_last_used_id)
1304                 d->opd_syn_last_used_id = id;
1305         if (cfs_list_empty(&d->opd_syn_ontrack))
1306                 cfs_list_add(&d->opd_syn_ontrack, &tr->otr_wakeup_list);
1307         spin_unlock(&tr->otr_lock);
1308         CDEBUG(D_OTHER, "new id %u\n", (unsigned) id);
1309
1310         return id;
1311 }
1312
1313 static void osp_sync_remove_from_tracker(struct osp_device *d)
1314 {
1315         struct osp_id_tracker *tr;
1316
1317         tr = d->opd_syn_tracker;
1318         LASSERT(tr);
1319
1320         if (cfs_list_empty(&d->opd_syn_ontrack))
1321                 return;
1322
1323         spin_lock(&tr->otr_lock);
1324         cfs_list_del_init(&d->opd_syn_ontrack);
1325         spin_unlock(&tr->otr_lock);
1326 }
1327