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, 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 #ifndef EXPORT_SYMTAB
  45 # define EXPORT_SYMTAB
  46 #endif
  47 #define DEBUG_SUBSYSTEM S_MDS
  48
  49 #include <lustre_log.h>
  50 #include "osp_internal.h"
  51
  52 static int osp_sync_id_traction_init(struct osp_device *d);
  53 static void osp_sync_id_traction_fini(struct osp_device *d);
  54 static __u32 osp_sync_id_get(struct osp_device *d, __u32 id);
  55 static void osp_sync_remove_from_tracker(struct osp_device *d);
  56
  57 /*
  58  * this is a components of OSP implementing synchronization between MDS and OST
  59  * it llogs all interesting changes (currently it's uig/gid change and object
  60  * destroy) atomically, then makes sure changes hit OST storage
  61  *
  62  * we have 4 queues of work:
  63  *
  64  * the first queue is llog itself, once read a change is stored in 2nd queue
  65  * in form of RPC (but RPC isn't fired yet).
  66  *
  67  * the second queue (opd_syn_waiting_for_commit) holds changes awaiting local
  68  * commit. once change is committed locally it migrates onto 3rd queue.
  69  *
  70  * the third queue (opd_syn_committed_here) holds changes committed locally,
  71  * but not sent to OST (as the pipe can be full). once pipe becomes non-full
  72  * we take a change from the queue and fire corresponded RPC.
  73  *
  74  * once RPC is reported committed by OST (using regular last_committed mech.)
  75  * the change jumps into 4th queue (opd_syn_committed_there), now we can
  76  * cancel corresponded llog record and release RPC
  77  *
  78  * opd_syn_changes is a number of unread llog records (to be processed).
  79  * notice this number doesn't include llog records from previous boots.
  80  * with OSP_SYN_THRESHOLD we try to batch processing a bit (TO BE IMPLEMENTED)
  81  *
  82  * opd_syn_rpc_in_progress is a number of requests in 2-4 queues.
  83  * we control this with OSP_MAX_IN_PROGRESS so that OSP don't consume
  84  * too much memory -- how to deal with 1000th OSTs ? batching could help?
  85  *
  86  * opd_syn_rpc_in_flight is a number of RPC in flight.
  87  * we control this with OSP_MAX_IN_FLIGHT
  88  */
  89
  90 /* XXX: do math to learn reasonable threshold
  91  * should it be ~ number of changes fitting bulk? */
  92
  93 #define OSP_SYN_THRESHOLD       10
  94 #define OSP_MAX_IN_FLIGHT       8
  95 #define OSP_MAX_IN_PROGRESS     4096
  96
  97 #define OSP_JOB_MAGIC           0x26112005
  98
  99 static inline int osp_sync_running(struct osp_device *d)
 100 {
 101         return !!(d->opd_syn_thread.t_flags & SVC_RUNNING);
 102 }
 103
 104 static inline int osp_sync_stopped(struct osp_device *d)
 105 {
 106         return !!(d->opd_syn_thread.t_flags & SVC_STOPPED);
 107 }
 108
 109 static inline int osp_sync_has_new_job(struct osp_device *d)
 110 {
 111         return ((d->opd_syn_last_processed_id < d->opd_syn_last_used_id) &&
 112                 (d->opd_syn_last_processed_id < d->opd_syn_last_committed_id))
 113                 || (d->opd_syn_prev_done == 0);
 114 }
 115
 116 static inline int osp_sync_low_in_progress(struct osp_device *d)
 117 {
 118         return d->opd_syn_rpc_in_progress < d->opd_syn_max_rpc_in_progress;
 119 }
 120
 121 static inline int osp_sync_low_in_flight(struct osp_device *d)
 122 {
 123         return d->opd_syn_rpc_in_flight < d->opd_syn_max_rpc_in_flight;
 124 }
 125
 126 static inline int osp_sync_has_work(struct osp_device *d)
 127 {
 128         /* has new/old changes and low in-progress? */
 129         if (osp_sync_has_new_job(d) && osp_sync_low_in_progress(d) &&
 130             osp_sync_low_in_flight(d) && d->opd_imp_connected)
 131                 return 1;
 132
 133         /* has remotely committed? */
 134         if (!cfs_list_empty(&d->opd_syn_committed_there))
 135                 return 1;
 136
 137         return 0;
 138 }
 139
 140 #define osp_sync_check_for_work(d)                      \
 141 {                                                       \
 142         if (osp_sync_has_work(d)) {                     \
 143                 cfs_waitq_signal(&d->opd_syn_waitq);    \
 144         }                                               \
 145 }
 146
 147 void __osp_sync_check_for_work(struct osp_device *d)
 148 {
 149         osp_sync_check_for_work(d);
 150 }
 151
 152 static inline int osp_sync_can_process_new(struct osp_device *d,
 153                                            struct llog_rec_hdr *rec)
 154 {
 155         LASSERT(d);
 156
 157         if (!osp_sync_low_in_progress(d))
 158                 return 0;
 159         if (!osp_sync_low_in_flight(d))
 160                 return 0;
 161         if (!d->opd_imp_connected)
 162                 return 0;
 163         if (d->opd_syn_prev_done == 0)
 164                 return 1;
 165         if (d->opd_syn_changes == 0)
 166                 return 0;
 167         if (rec == NULL || rec->lrh_id <= d->opd_syn_last_committed_id)
 168                 return 1;
 169         return 0;
 170 }
 171
 172 int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
 173                          llog_op_type type, struct thandle *th)
 174 {
 175         struct osp_thread_info  *osi = osp_env_info(env);
 176         struct osp_device       *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
 177         struct llog_ctxt        *ctxt;
 178         int                      rc;
 179
 180         ENTRY;
 181
 182         /* it's a layering violation, to access internals of th,
 183          * but we can do this as a sanity check, for a while */
 184         LASSERT(th->th_dev == d->opd_storage);
 185
 186         switch (type) {
 187         case MDS_UNLINK64_REC:
 188                 osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
 189                 break;
 190         case MDS_SETATTR64_REC:
 191                 osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec);
 192                 break;
 193         default:
 194                 LBUG();
 195         }
 196
 197         /* we want ->dt_trans_start() to allocate per-thandle structure */
 198         th->th_tags |= LCT_OSP_THREAD;
 199
 200         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
 201         LASSERT(ctxt);
 202
 203         rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr, th);
 204         llog_ctxt_put(ctxt);
 205
 206         RETURN(rc);
 207 }
 208
 209 static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
 210                             const struct lu_fid *fid, llog_op_type type,
 211                             int count, struct thandle *th,
 212                             const struct lu_attr *attr)
 213 {
 214         struct osp_thread_info  *osi = osp_env_info(env);
 215         struct llog_ctxt        *ctxt;
 216         struct osp_txn_info     *txn;
 217         int                      rc;
 218
 219         ENTRY;
 220
 221         /* it's a layering violation, to access internals of th,
 222          * but we can do this as a sanity check, for a while */
 223         LASSERT(th->th_dev == d->opd_storage);
 224
 225         switch (type) {
 226         case MDS_UNLINK64_REC:
 227                 osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
 228                 osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
 229                 osi->osi_unlink.lur_fid  = *fid;
 230                 osi->osi_unlink.lur_count = count;
 231                 break;
 232         case MDS_SETATTR64_REC:
 233                 rc = fid_to_ostid(fid, &osi->osi_oi);
 234                 LASSERT(rc == 0);
 235                 osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
 236                 osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
 237                 osi->osi_setattr.lsr_oi  = osi->osi_oi;
 238                 LASSERT(attr);
 239                 osi->osi_setattr.lsr_uid = attr->la_uid;
 240                 osi->osi_setattr.lsr_gid = attr->la_gid;
 241                 break;
 242         default:
 243                 LBUG();
 244         }
 245
 246         txn = osp_txn_info(&th->th_ctx);
 247         LASSERT(txn);
 248
 249         txn->oti_current_id = osp_sync_id_get(d, txn->oti_current_id);
 250         osi->osi_hdr.lrh_id = txn->oti_current_id;
 251
 252         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
 253         if (ctxt == NULL)
 254                 RETURN(-ENOMEM);
 255         rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
 256                       NULL, th);
 257         llog_ctxt_put(ctxt);
 258
 259         CDEBUG(D_OTHER, "%s: new record "DOSTID":%lu/%lu: %d\n",
 260                d->opd_obd->obd_name, POSTID(&osi->osi_cookie.lgc_lgl.lgl_oi),
 261                (unsigned long) osi->osi_cookie.lgc_lgl.lgl_ogen,
 262                (unsigned long) osi->osi_cookie.lgc_index, rc);
 263
 264         if (rc > 0)
 265                 rc = 0;
 266
 267         if (likely(rc == 0)) {
 268                 spin_lock(&d->opd_syn_lock);
 269                 d->opd_syn_changes++;
 270                 spin_unlock(&d->opd_syn_lock);
 271         }
 272
 273         RETURN(rc);
 274 }
 275
 276 int osp_sync_add(const struct lu_env *env, struct osp_object *o,
 277                  llog_op_type type, struct thandle *th,
 278                  const struct lu_attr *attr)
 279 {
 280         return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
 281                                 lu_object_fid(&o->opo_obj.do_lu), type, 1,
 282                                 th, attr);
 283 }
 284
 285 int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
 286                  struct lu_fid *fid, int lost, struct thandle *th)
 287 {
 288         return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
 289 }
 290
 291 /*
 292  * it's quite obvious we can't maintain all the structures in the memory:
 293  * while OST is down, MDS can be processing thousands and thousands of unlinks
 294  * filling persistent llogs and in-core respresentation
 295  *
 296  * this doesn't scale at all. so we need basically the following:
 297  * a) destroy/setattr append llog records
 298  * b) once llog has grown to X records, we process first Y committed records
 299  *
 300  *  once record R is found via llog_process(), it becomes committed after any
 301  *  subsequent commit callback (at the most)
 302  */
 303
 304 /*
 305  * called for each atomic on-disk change (not once per transaction batch)
 306  * and goes over the list
 307  * XXX: should be optimized?
 308  */
 309
 310 /**
 311  * called for each RPC reported committed
 312  */
 313 static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
 314 {
 315         struct osp_device *d = req->rq_cb_data;
 316
 317         CDEBUG(D_HA, "commit req %p, transno "LPU64"\n", req, req->rq_transno);
 318
 319         if (unlikely(req->rq_transno == 0))
 320                 return;
 321
 322         /* do not do any opd_dyn_rpc_* accounting here
 323          * it's done in osp_sync_interpret sooner or later */
 324
 325         LASSERT(d);
 326         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 327         LASSERT(cfs_list_empty(&req->rq_exp_list));
 328
 329         ptlrpc_request_addref(req);
 330
 331         spin_lock(&d->opd_syn_lock);
 332         cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 333         spin_unlock(&d->opd_syn_lock);
 334
 335         /* XXX: some batching wouldn't hurt */
 336         cfs_waitq_signal(&d->opd_syn_waitq);
 337 }
 338
 339 static int osp_sync_interpret(const struct lu_env *env,
 340                               struct ptlrpc_request *req, void *aa, int rc)
 341 {
 342         struct osp_device *d = req->rq_cb_data;
 343
 344         if (req->rq_svc_thread != (void *) OSP_JOB_MAGIC)
 345                 DEBUG_REQ(D_ERROR, req, "bad magic %p\n", req->rq_svc_thread);
 346         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 347         LASSERT(d);
 348
 349         CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
 350                cfs_atomic_read(&req->rq_refcount),
 351                rc, (unsigned) req->rq_transno);
 352         LASSERT(rc || req->rq_transno);
 353
 354         if (rc == -ENOENT) {
 355                 /*
 356                  * we tried to destroy object or update attributes,
 357                  * but object doesn't exist anymore - cancell llog record
 358                  */
 359                 LASSERT(req->rq_transno == 0);
 360                 LASSERT(cfs_list_empty(&req->rq_exp_list));
 361
 362                 ptlrpc_request_addref(req);
 363
 364                 spin_lock(&d->opd_syn_lock);
 365                 cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 366                 spin_unlock(&d->opd_syn_lock);
 367
 368                 cfs_waitq_signal(&d->opd_syn_waitq);
 369         } else if (rc) {
 370                 struct obd_import *imp = req->rq_import;
 371                 /*
 372                  * error happened, we'll try to repeat on next boot ?
 373                  */
 374                 LASSERTF(req->rq_transno == 0 ||
 375                          req->rq_import_generation < imp->imp_generation,
 376                          "transno "LPU64", rc %d, gen: req %d, imp %d\n",
 377                          req->rq_transno, rc, req->rq_import_generation,
 378                          imp->imp_generation);
 379                 if (req->rq_transno == 0) {
 380                         /* this is the last time we see the request
 381                          * if transno is not zero, then commit cb
 382                          * will be called at some point */
 383                         LASSERT(d->opd_syn_rpc_in_progress > 0);
 384                         spin_lock(&d->opd_syn_lock);
 385                         d->opd_syn_rpc_in_progress--;
 386                         spin_unlock(&d->opd_syn_lock);
 387                 }
 388
 389                 cfs_waitq_signal(&d->opd_syn_waitq);
 390         } else if (unlikely(d->opd_pre_status == -ENOSPC)) {
 391                 /*
 392                  * if current status is -ENOSPC (lack of free space on OST)
 393                  * then we should poll OST immediately once object destroy
 394                  * is replied
 395                  */
 396                 osp_statfs_need_now(d);
 397         }
 398
 399         LASSERT(d->opd_syn_rpc_in_flight > 0);
 400         spin_lock(&d->opd_syn_lock);
 401         d->opd_syn_rpc_in_flight--;
 402         spin_unlock(&d->opd_syn_lock);
 403         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 404                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 405                d->opd_syn_rpc_in_progress);
 406
 407         osp_sync_check_for_work(d);
 408
 409         return 0;
 410 }
 411
 412 /*
 413  * the function walks through list of committed locally changes
 414  * and send them to RPC until the pipe is full
 415  */
 416 static void osp_sync_send_new_rpc(struct osp_device *d,
 417                                   struct ptlrpc_request *req)
 418 {
 419         LASSERT(d->opd_syn_rpc_in_flight <= d->opd_syn_max_rpc_in_flight);
 420         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 421
 422         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 423 }
 424
 425 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
 426                                                struct llog_handle *llh,
 427                                                struct llog_rec_hdr *h,
 428                                                ost_cmd_t op,
 429                                                const struct req_format *format)
 430 {
 431         struct ptlrpc_request   *req;
 432         struct ost_body         *body;
 433         struct obd_import       *imp;
 434         int                      rc;
 435
 436         /* Prepare the request */
 437         imp = d->opd_obd->u.cli.cl_import;
 438         LASSERT(imp);
 439         req = ptlrpc_request_alloc(imp, format);
 440         if (req == NULL)
 441                 RETURN(ERR_PTR(-ENOMEM));
 442
 443         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
 444         if (rc) {
 445                 ptlrpc_req_finished(req);
 446                 return ERR_PTR(rc);
 447         }
 448
 449         /*
 450          * this is a trick: to save on memory allocations we put cookie
 451          * into the request, but don't set corresponded flag in o_valid
 452          * so that OST doesn't interpret this cookie. once the request
 453          * is committed on OST we take cookie from the request and cancel
 454          */
 455         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 456         LASSERT(body);
 457         body->oa.o_lcookie.lgc_lgl = llh->lgh_id;
 458         body->oa.o_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 459         body->oa.o_lcookie.lgc_index = h->lrh_index;
 460         CFS_INIT_LIST_HEAD(&req->rq_exp_list);
 461         req->rq_svc_thread = (void *) OSP_JOB_MAGIC;
 462
 463         req->rq_interpret_reply = osp_sync_interpret;
 464         req->rq_commit_cb = osp_sync_request_commit_cb;
 465         req->rq_cb_data = d;
 466
 467         ptlrpc_request_set_replen(req);
 468
 469         return req;
 470 }
 471
 472 static int osp_sync_new_setattr_job(struct osp_device *d,
 473                                     struct llog_handle *llh,
 474                                     struct llog_rec_hdr *h)
 475 {
 476         struct llog_setattr64_rec       *rec = (struct llog_setattr64_rec *)h;
 477         struct ptlrpc_request           *req;
 478         struct ost_body                 *body;
 479
 480         ENTRY;
 481         LASSERT(h->lrh_type == MDS_SETATTR64_REC);
 482
 483         req = osp_sync_new_job(d, llh, h, OST_SETATTR, &RQF_OST_SETATTR);
 484         if (IS_ERR(req))
 485                 RETURN(PTR_ERR(req));
 486
 487         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 488         LASSERT(body);
 489         body->oa.o_oi = rec->lsr_oi;
 490         body->oa.o_uid = rec->lsr_uid;
 491         body->oa.o_gid = rec->lsr_gid;
 492         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
 493                            OBD_MD_FLUID | OBD_MD_FLGID;
 494
 495         osp_sync_send_new_rpc(d, req);
 496         RETURN(0);
 497 }
 498
 499 /* Old records may be in old format, so we handle that too */
 500 static int osp_sync_new_unlink_job(struct osp_device *d,
 501                                    struct llog_handle *llh,
 502                                    struct llog_rec_hdr *h)
 503 {
 504         struct llog_unlink_rec  *rec = (struct llog_unlink_rec *)h;
 505         struct ptlrpc_request   *req;
 506         struct ost_body         *body;
 507
 508         ENTRY;
 509         LASSERT(h->lrh_type == MDS_UNLINK_REC);
 510
 511         req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
 512         if (IS_ERR(req))
 513                 RETURN(PTR_ERR(req));
 514
 515         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 516         LASSERT(body);
 517         ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
 518         ostid_set_id(&body->oa.o_oi, rec->lur_oid);
 519         body->oa.o_misc = rec->lur_count;
 520         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
 521         if (rec->lur_count)
 522                 body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
 523
 524         osp_sync_send_new_rpc(d, req);
 525         RETURN(0);
 526 }
 527
 528 static int osp_sync_new_unlink64_job(struct osp_device *d,
 529                                      struct llog_handle *llh,
 530                                      struct llog_rec_hdr *h)
 531 {
 532         struct llog_unlink64_rec        *rec = (struct llog_unlink64_rec *)h;
 533         struct ptlrpc_request           *req;
 534         struct ost_body                 *body;
 535         int                              rc;
 536
 537         ENTRY;
 538         LASSERT(h->lrh_type == MDS_UNLINK64_REC);
 539
 540         req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
 541         if (IS_ERR(req))
 542                 RETURN(PTR_ERR(req));
 543
 544         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 545         if (body == NULL)
 546                 RETURN(-EFAULT);
 547         rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
 548         if (rc < 0)
 549                 RETURN(rc);
 550         body->oa.o_misc = rec->lur_count;
 551         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID | OBD_MD_FLOBJCOUNT;
 552
 553         osp_sync_send_new_rpc(d, req);
 554         RETURN(0);
 555 }
 556
 557 static int osp_sync_process_record(const struct lu_env *env,
 558                                    struct osp_device *d,
 559                                    struct llog_handle *llh,
 560                                    struct llog_rec_hdr *rec)
 561 {
 562         struct llog_cookie       cookie;
 563         int                      rc = 0;
 564
 565         cookie.lgc_lgl = llh->lgh_id;
 566         cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 567         cookie.lgc_index = rec->lrh_index;
 568
 569         if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
 570                 struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
 571
 572                 /* we're waiting for the record generated by this instance */
 573                 LASSERT(d->opd_syn_prev_done == 0);
 574                 if (!memcmp(&d->opd_syn_generation, &gen->lgr_gen,
 575                             sizeof(gen->lgr_gen))) {
 576                         CDEBUG(D_HA, "processed all old entries\n");
 577                         d->opd_syn_prev_done = 1;
 578                 }
 579
 580                 /* cancel any generation record */
 581                 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
 582                                              1, &cookie);
 583
 584                 return rc;
 585         }
 586
 587         /*
 588          * now we prepare and fill requests to OST, put them on the queue
 589          * and fire after next commit callback
 590          */
 591
 592         /* notice we increment counters before sending RPC, to be consistent
 593          * in RPC interpret callback which may happen very quickly */
 594         spin_lock(&d->opd_syn_lock);
 595         d->opd_syn_rpc_in_flight++;
 596         d->opd_syn_rpc_in_progress++;
 597         spin_unlock(&d->opd_syn_lock);
 598
 599         switch (rec->lrh_type) {
 600         /* case MDS_UNLINK_REC is kept for compatibility */
 601         case MDS_UNLINK_REC:
 602                 rc = osp_sync_new_unlink_job(d, llh, rec);
 603                 break;
 604         case MDS_UNLINK64_REC:
 605                 rc = osp_sync_new_unlink64_job(d, llh, rec);
 606                 break;
 607         case MDS_SETATTR64_REC:
 608                 rc = osp_sync_new_setattr_job(d, llh, rec);
 609                 break;
 610         default:
 611                 CERROR("unknown record type: %x\n", rec->lrh_type);
 612                        rc = -EINVAL;
 613                        break;
 614         }
 615
 616         if (likely(rc == 0)) {
 617                 spin_lock(&d->opd_syn_lock);
 618                 if (d->opd_syn_prev_done) {
 619                         LASSERT(d->opd_syn_changes > 0);
 620                         LASSERT(rec->lrh_id <= d->opd_syn_last_committed_id);
 621                         /*
 622                          * NOTE: it's possible to meet same id if
 623                          * OST stores few stripes of same file
 624                          */
 625                         if (rec->lrh_id > d->opd_syn_last_processed_id)
 626                                 d->opd_syn_last_processed_id = rec->lrh_id;
 627
 628                         d->opd_syn_changes--;
 629                 }
 630                 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 631                        d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 632                        d->opd_syn_rpc_in_progress);
 633                 spin_unlock(&d->opd_syn_lock);
 634         } else {
 635                 spin_lock(&d->opd_syn_lock);
 636                 d->opd_syn_rpc_in_flight--;
 637                 d->opd_syn_rpc_in_progress--;
 638                 spin_unlock(&d->opd_syn_lock);
 639         }
 640
 641         CDEBUG(D_HA, "found record %x, %d, idx %u, id %u: %d\n",
 642                rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id, rc);
 643         return rc;
 644 }
 645
 646 static void osp_sync_process_committed(const struct lu_env *env,
 647                                        struct osp_device *d)
 648 {
 649         struct obd_device       *obd = d->opd_obd;
 650         struct obd_import       *imp = obd->u.cli.cl_import;
 651         struct ost_body         *body;
 652         struct ptlrpc_request   *req, *tmp;
 653         struct llog_ctxt        *ctxt;
 654         struct llog_handle      *llh;
 655         cfs_list_t               list;
 656         int                      rc, done = 0;
 657
 658         ENTRY;
 659
 660         if (cfs_list_empty(&d->opd_syn_committed_there))
 661                 return;
 662
 663         /*
 664          * if current status is -ENOSPC (lack of free space on OST)
 665          * then we should poll OST immediately once object destroy
 666          * is committed.
 667          * notice: we do this upon commit as well because some backends
 668          * (like DMU) do not release space right away.
 669          */
 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                 cfs_waitq_signal(&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         char                     pname[16];
 827
 828         ENTRY;
 829
 830         rc = lu_env_init(&env, LCT_LOCAL);
 831         if (rc) {
 832                 CERROR("%s: can't initialize env: rc = %d\n",
 833                        obd->obd_name, rc);
 834                 RETURN(rc);
 835         }
 836
 837         sprintf(pname, "osp-syn-%u", d->opd_index);
 838         cfs_daemonize(pname);
 839
 840         spin_lock(&d->opd_syn_lock);
 841         thread->t_flags = SVC_RUNNING;
 842         spin_unlock(&d->opd_syn_lock);
 843         cfs_waitq_signal(&thread->t_ctl_waitq);
 844
 845         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 846         if (ctxt == NULL) {
 847                 CERROR("can't get appropriate context\n");
 848                 GOTO(out, rc = -EINVAL);
 849         }
 850
 851         llh = ctxt->loc_handle;
 852         if (llh == NULL) {
 853                 CERROR("can't get llh\n");
 854                 llog_ctxt_put(ctxt);
 855                 GOTO(out, rc = -EINVAL);
 856         }
 857
 858         rc = llog_cat_process(&env, llh, osp_sync_process_queues, d, 0, 0);
 859         LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
 860                  "%lu changes, %u in progress, %u in flight: %d\n",
 861                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 862                  d->opd_syn_rpc_in_flight, rc);
 863
 864         /* we don't expect llog_process_thread() to exit till umount */
 865         LASSERTF(thread->t_flags != SVC_RUNNING,
 866                  "%lu changes, %u in progress, %u in flight\n",
 867                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 868                  d->opd_syn_rpc_in_flight);
 869
 870         /* wait till all the requests are completed */
 871         count = 0;
 872         while (d->opd_syn_rpc_in_progress > 0) {
 873                 osp_sync_process_committed(&env, d);
 874
 875                 lwi = LWI_TIMEOUT(cfs_time_seconds(5), NULL, NULL);
 876                 rc = l_wait_event(d->opd_syn_waitq,
 877                                   d->opd_syn_rpc_in_progress == 0,
 878                                   &lwi);
 879                 if (rc == -ETIMEDOUT)
 880                         count++;
 881                 LASSERTF(count < 10, "%s: %d %d %sempty\n",
 882                          d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 883                          d->opd_syn_rpc_in_flight,
 884                          cfs_list_empty(&d->opd_syn_committed_there) ? "" :"!");
 885
 886         }
 887
 888         llog_cat_close(&env, llh);
 889         rc = llog_cleanup(&env, ctxt);
 890         if (rc)
 891                 CERROR("can't cleanup llog: %d\n", rc);
 892 out:
 893         thread->t_flags = SVC_STOPPED;
 894
 895         cfs_waitq_signal(&thread->t_ctl_waitq);
 896         LASSERTF(d->opd_syn_rpc_in_progress == 0,
 897                  "%s: %d %d %sempty\n",
 898                  d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 899                  d->opd_syn_rpc_in_flight,
 900                  cfs_list_empty(&d->opd_syn_committed_there) ? "" : "!");
 901
 902         lu_env_fini(&env);
 903
 904         RETURN(0);
 905 }
 906
 907 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
 908 {
 909         struct osp_thread_info *osi = osp_env_info(env);
 910         struct llog_handle     *lgh = NULL;
 911         struct obd_device      *obd = d->opd_obd;
 912         struct llog_ctxt       *ctxt;
 913         int                     rc;
 914
 915         ENTRY;
 916
 917         LASSERT(obd);
 918
 919         /*
 920          * open llog corresponding to our OST
 921          */
 922         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
 923         obd->obd_lvfs_ctxt.dt = d->opd_storage;
 924
 925         rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
 926                                    &osi->osi_cid);
 927         if (rc) {
 928                 CERROR("%s: can't get id from catalogs: rc = %d\n",
 929                        obd->obd_name, rc);
 930                 RETURN(rc);
 931         }
 932
 933         CDEBUG(D_INFO, "%s: Init llog for %d - catid "DOSTID":%x\n",
 934                obd->obd_name, d->opd_index,
 935                POSTID(&osi->osi_cid.lci_logid.lgl_oi),
 936                osi->osi_cid.lci_logid.lgl_ogen);
 937
 938         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, obd,
 939                         &osp_mds_ost_orig_logops);
 940         if (rc)
 941                 RETURN(rc);
 942
 943         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 944         LASSERT(ctxt);
 945
 946         if (likely(ostid_id(&osi->osi_cid.lci_logid.lgl_oi) != 0)) {
 947                 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid, NULL,
 948                                LLOG_OPEN_EXISTS);
 949                 /* re-create llog if it is missing */
 950                 if (rc == -ENOENT)
 951                         logid_set_id(&osi->osi_cid.lci_logid, 0);
 952                 else if (rc < 0)
 953                         GOTO(out_cleanup, rc);
 954         }
 955
 956         if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
 957                 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
 958                 if (rc < 0)
 959                         GOTO(out_cleanup, rc);
 960                 osi->osi_cid.lci_logid = lgh->lgh_id;
 961         }
 962
 963         LASSERT(lgh != NULL);
 964         ctxt->loc_handle = lgh;
 965
 966         rc = llog_cat_init_and_process(env, lgh);
 967         if (rc)
 968                 GOTO(out_close, rc);
 969
 970         rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
 971                                    &osi->osi_cid);
 972         if (rc)
 973                 GOTO(out_close, rc);
 974
 975         /*
 976          * put a mark in the llog till which we'll be processing
 977          * old records restless
 978          */
 979         d->opd_syn_generation.mnt_cnt = cfs_time_current();
 980         d->opd_syn_generation.conn_cnt = cfs_time_current();
 981
 982         osi->osi_hdr.lrh_type = LLOG_GEN_REC;
 983         osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
 984
 985         memcpy(&osi->osi_gen.lgr_gen, &d->opd_syn_generation,
 986                sizeof(osi->osi_gen.lgr_gen));
 987
 988         rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie,
 989                           NULL);
 990         if (rc < 0)
 991                 GOTO(out_close, rc);
 992         llog_ctxt_put(ctxt);
 993         RETURN(0);
 994 out_close:
 995         llog_cat_close(env, lgh);
 996 out_cleanup:
 997         llog_cleanup(env, ctxt);
 998         RETURN(rc);
 999 }
1000
1001 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
1002 {
1003         struct llog_ctxt *ctxt;
1004
1005         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1006         llog_cat_close(env, ctxt->loc_handle);
1007         llog_cleanup(env, ctxt);
1008 }
1009
1010 /*
1011  * initializes sync component of OSP
1012  */
1013 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1014 {
1015         struct l_wait_info       lwi = { 0 };
1016         int                      rc;
1017
1018         ENTRY;
1019
1020         rc = osp_sync_id_traction_init(d);
1021         if (rc)
1022                 RETURN(rc);
1023
1024         /*
1025          * initialize llog storing changes
1026          */
1027         rc = osp_sync_llog_init(env, d);
1028         if (rc) {
1029                 CERROR("%s: can't initialize llog: rc = %d\n",
1030                        d->opd_obd->obd_name, rc);
1031                 GOTO(err_id, rc);
1032         }
1033
1034         /*
1035          * Start synchronization thread
1036          */
1037         d->opd_syn_max_rpc_in_flight = OSP_MAX_IN_FLIGHT;
1038         d->opd_syn_max_rpc_in_progress = OSP_MAX_IN_PROGRESS;
1039         spin_lock_init(&d->opd_syn_lock);
1040         cfs_waitq_init(&d->opd_syn_waitq);
1041         cfs_waitq_init(&d->opd_syn_thread.t_ctl_waitq);
1042         CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
1043
1044         rc = cfs_create_thread(osp_sync_thread, d, 0);
1045         if (rc < 0) {
1046                 CERROR("%s: can't start sync thread: rc = %d\n",
1047                        d->opd_obd->obd_name, rc);
1048                 GOTO(err_llog, rc);
1049         }
1050
1051         l_wait_event(d->opd_syn_thread.t_ctl_waitq,
1052                      osp_sync_running(d) || osp_sync_stopped(d), &lwi);
1053
1054         RETURN(0);
1055 err_llog:
1056         osp_sync_llog_fini(env, d);
1057 err_id:
1058         osp_sync_id_traction_fini(d);
1059         return rc;
1060 }
1061
1062 int osp_sync_fini(struct osp_device *d)
1063 {
1064         struct ptlrpc_thread *thread = &d->opd_syn_thread;
1065
1066         ENTRY;
1067
1068         thread->t_flags = SVC_STOPPING;
1069         cfs_waitq_signal(&d->opd_syn_waitq);
1070         cfs_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1071
1072         /*
1073          * unregister transaction callbacks only when sync thread
1074          * has finished operations with llog
1075          */
1076         osp_sync_id_traction_fini(d);
1077
1078         RETURN(0);
1079 }
1080
1081 static DEFINE_MUTEX(osp_id_tracker_sem);
1082 static CFS_LIST_HEAD(osp_id_tracker_list);
1083
1084 static void osp_sync_tracker_commit_cb(struct thandle *th, void *cookie)
1085 {
1086         struct osp_id_tracker   *tr = cookie;
1087         struct osp_device       *d;
1088         struct osp_txn_info     *txn;
1089
1090         LASSERT(tr);
1091
1092         txn = osp_txn_info(&th->th_ctx);
1093         if (txn == NULL || txn->oti_current_id < tr->otr_committed_id)
1094                 return;
1095
1096         spin_lock(&tr->otr_lock);
1097         if (likely(txn->oti_current_id > tr->otr_committed_id)) {
1098                 CDEBUG(D_OTHER, "committed: %u -> %u\n",
1099                        tr->otr_committed_id, txn->oti_current_id);
1100                 tr->otr_committed_id = txn->oti_current_id;
1101
1102                 cfs_list_for_each_entry(d, &tr->otr_wakeup_list,
1103                                         opd_syn_ontrack) {
1104                         d->opd_syn_last_committed_id = tr->otr_committed_id;
1105                         cfs_waitq_signal(&d->opd_syn_waitq);
1106                 }
1107         }
1108         spin_unlock(&tr->otr_lock);
1109 }
1110
1111 static int osp_sync_id_traction_init(struct osp_device *d)
1112 {
1113         struct osp_id_tracker   *tr, *found = NULL;
1114         int                      rc = 0;
1115
1116         LASSERT(d);
1117         LASSERT(d->opd_storage);
1118         LASSERT(d->opd_syn_tracker == NULL);
1119         CFS_INIT_LIST_HEAD(&d->opd_syn_ontrack);
1120
1121         mutex_lock(&osp_id_tracker_sem);
1122         cfs_list_for_each_entry(tr, &osp_id_tracker_list, otr_list) {
1123                 if (tr->otr_dev == d->opd_storage) {
1124                         LASSERT(cfs_atomic_read(&tr->otr_refcount));
1125                         cfs_atomic_inc(&tr->otr_refcount);
1126                         d->opd_syn_tracker = tr;
1127                         found = tr;
1128                         break;
1129                 }
1130         }
1131
1132         if (found == NULL) {
1133                 rc = -ENOMEM;
1134                 OBD_ALLOC_PTR(tr);
1135                 if (tr) {
1136                         d->opd_syn_tracker = tr;
1137                         spin_lock_init(&tr->otr_lock);
1138                         tr->otr_dev = d->opd_storage;
1139                         tr->otr_next_id = 1;
1140                         tr->otr_committed_id = 0;
1141                         cfs_atomic_set(&tr->otr_refcount, 1);
1142                         CFS_INIT_LIST_HEAD(&tr->otr_wakeup_list);
1143                         cfs_list_add(&tr->otr_list, &osp_id_tracker_list);
1144                         tr->otr_tx_cb.dtc_txn_commit =
1145                                                 osp_sync_tracker_commit_cb;
1146                         tr->otr_tx_cb.dtc_cookie = tr;
1147                         tr->otr_tx_cb.dtc_tag = LCT_MD_THREAD;
1148                         dt_txn_callback_add(d->opd_storage, &tr->otr_tx_cb);
1149                         rc = 0;
1150                 }
1151         }
1152         mutex_unlock(&osp_id_tracker_sem);
1153
1154         return rc;
1155 }
1156
1157 static void osp_sync_id_traction_fini(struct osp_device *d)
1158 {
1159         struct osp_id_tracker *tr;
1160
1161         ENTRY;
1162
1163         LASSERT(d);
1164         tr = d->opd_syn_tracker;
1165         if (tr == NULL) {
1166                 EXIT;
1167                 return;
1168         }
1169
1170         osp_sync_remove_from_tracker(d);
1171
1172         mutex_lock(&osp_id_tracker_sem);
1173         if (cfs_atomic_dec_and_test(&tr->otr_refcount)) {
1174                 dt_txn_callback_del(d->opd_storage, &tr->otr_tx_cb);
1175                 LASSERT(cfs_list_empty(&tr->otr_wakeup_list));
1176                 cfs_list_del(&tr->otr_list);
1177                 OBD_FREE_PTR(tr);
1178                 d->opd_syn_tracker = NULL;
1179         }
1180         mutex_unlock(&osp_id_tracker_sem);
1181
1182         EXIT;
1183 }
1184
1185 /*
1186  * generates id for the tracker
1187  */
1188 static __u32 osp_sync_id_get(struct osp_device *d, __u32 id)
1189 {
1190         struct osp_id_tracker *tr;
1191
1192         tr = d->opd_syn_tracker;
1193         LASSERT(tr);
1194
1195         /* XXX: we can improve this introducing per-cpu preallocated ids? */
1196         spin_lock(&tr->otr_lock);
1197         if (unlikely(tr->otr_next_id <= d->opd_syn_last_used_id)) {
1198                 spin_unlock(&tr->otr_lock);
1199                 CERROR("%s: next %u, last synced %lu\n",
1200                        d->opd_obd->obd_name, tr->otr_next_id,
1201                        d->opd_syn_last_used_id);
1202                 LBUG();
1203         }
1204
1205         if (id == 0)
1206                 id = tr->otr_next_id++;
1207         if (id > d->opd_syn_last_used_id)
1208                 d->opd_syn_last_used_id = id;
1209         if (cfs_list_empty(&d->opd_syn_ontrack))
1210                 cfs_list_add(&d->opd_syn_ontrack, &tr->otr_wakeup_list);
1211         spin_unlock(&tr->otr_lock);
1212         CDEBUG(D_OTHER, "new id %u\n", (unsigned) id);
1213
1214         return id;
1215 }
1216
1217 static void osp_sync_remove_from_tracker(struct osp_device *d)
1218 {
1219         struct osp_id_tracker *tr;
1220
1221         tr = d->opd_syn_tracker;
1222         LASSERT(tr);
1223
1224         if (cfs_list_empty(&d->opd_syn_ontrack))
1225                 return;
1226
1227         spin_lock(&tr->otr_lock);
1228         cfs_list_del_init(&d->opd_syn_ontrack);
1229         spin_unlock(&tr->otr_lock);
1230 }
1231