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 (!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 (unlikely(atomic_read(&d->opd_syn_barrier) > 0))
 155                 return 0;
 156         if (!osp_sync_low_in_progress(d))
 157                 return 0;
 158         if (!osp_sync_low_in_flight(d))
 159                 return 0;
 160         if (!d->opd_imp_connected)
 161                 return 0;
 162         if (d->opd_syn_prev_done == 0)
 163                 return 1;
 164         if (d->opd_syn_changes == 0)
 165                 return 0;
 166         if (rec == NULL || rec->lrh_id <= d->opd_syn_last_committed_id)
 167                 return 1;
 168         return 0;
 169 }
 170
 171 int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
 172                          llog_op_type type, struct thandle *th)
 173 {
 174         struct osp_thread_info  *osi = osp_env_info(env);
 175         struct osp_device       *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
 176         struct llog_ctxt        *ctxt;
 177         int                      rc;
 178
 179         ENTRY;
 180
 181         /* it's a layering violation, to access internals of th,
 182          * but we can do this as a sanity check, for a while */
 183         LASSERT(th->th_dev == d->opd_storage);
 184
 185         switch (type) {
 186         case MDS_UNLINK64_REC:
 187                 osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
 188                 break;
 189         case MDS_SETATTR64_REC:
 190                 osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec);
 191                 break;
 192         default:
 193                 LBUG();
 194         }
 195
 196         /* we want ->dt_trans_start() to allocate per-thandle structure */
 197         th->th_tags |= LCT_OSP_THREAD;
 198
 199         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
 200         LASSERT(ctxt);
 201
 202         rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr, th);
 203         llog_ctxt_put(ctxt);
 204
 205         RETURN(rc);
 206 }
 207
 208 static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
 209                             const struct lu_fid *fid, llog_op_type type,
 210                             int count, struct thandle *th,
 211                             const struct lu_attr *attr)
 212 {
 213         struct osp_thread_info  *osi = osp_env_info(env);
 214         struct llog_ctxt        *ctxt;
 215         struct osp_txn_info     *txn;
 216         int                      rc;
 217
 218         ENTRY;
 219
 220         /* it's a layering violation, to access internals of th,
 221          * but we can do this as a sanity check, for a while */
 222         LASSERT(th->th_dev == d->opd_storage);
 223
 224         switch (type) {
 225         case MDS_UNLINK64_REC:
 226                 osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
 227                 osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
 228                 osi->osi_unlink.lur_fid  = *fid;
 229                 osi->osi_unlink.lur_count = count;
 230                 break;
 231         case MDS_SETATTR64_REC:
 232                 rc = fid_to_ostid(fid, &osi->osi_oi);
 233                 LASSERT(rc == 0);
 234                 osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
 235                 osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
 236                 osi->osi_setattr.lsr_oi  = osi->osi_oi;
 237                 LASSERT(attr);
 238                 osi->osi_setattr.lsr_uid = attr->la_uid;
 239                 osi->osi_setattr.lsr_gid = attr->la_gid;
 240                 osi->osi_setattr.lsr_valid =
 241                         ((attr->la_valid & LA_UID) ? OBD_MD_FLUID : 0) |
 242                         ((attr->la_valid & LA_GID) ? OBD_MD_FLGID : 0);
 243                 break;
 244         default:
 245                 LBUG();
 246         }
 247
 248         txn = osp_txn_info(&th->th_ctx);
 249         LASSERT(txn);
 250
 251         txn->oti_current_id = osp_sync_id_get(d, txn->oti_current_id);
 252         osi->osi_hdr.lrh_id = txn->oti_current_id;
 253
 254         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
 255         if (ctxt == NULL)
 256                 RETURN(-ENOMEM);
 257         rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
 258                       th);
 259         llog_ctxt_put(ctxt);
 260
 261         CDEBUG(D_OTHER, "%s: new record "DOSTID":%lu/%lu: %d\n",
 262                d->opd_obd->obd_name, POSTID(&osi->osi_cookie.lgc_lgl.lgl_oi),
 263                (unsigned long) osi->osi_cookie.lgc_lgl.lgl_ogen,
 264                (unsigned long) osi->osi_cookie.lgc_index, rc);
 265
 266         if (rc > 0)
 267                 rc = 0;
 268
 269         if (likely(rc == 0)) {
 270                 spin_lock(&d->opd_syn_lock);
 271                 d->opd_syn_changes++;
 272                 spin_unlock(&d->opd_syn_lock);
 273         }
 274
 275         RETURN(rc);
 276 }
 277
 278 int osp_sync_add(const struct lu_env *env, struct osp_object *o,
 279                  llog_op_type type, struct thandle *th,
 280                  const struct lu_attr *attr)
 281 {
 282         return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
 283                                 lu_object_fid(&o->opo_obj.do_lu), type, 1,
 284                                 th, attr);
 285 }
 286
 287 int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
 288                  struct lu_fid *fid, int lost, struct thandle *th)
 289 {
 290         return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
 291 }
 292
 293 /*
 294  * it's quite obvious we can't maintain all the structures in the memory:
 295  * while OST is down, MDS can be processing thousands and thousands of unlinks
 296  * filling persistent llogs and in-core respresentation
 297  *
 298  * this doesn't scale at all. so we need basically the following:
 299  * a) destroy/setattr append llog records
 300  * b) once llog has grown to X records, we process first Y committed records
 301  *
 302  *  once record R is found via llog_process(), it becomes committed after any
 303  *  subsequent commit callback (at the most)
 304  */
 305
 306 /*
 307  * called for each atomic on-disk change (not once per transaction batch)
 308  * and goes over the list
 309  * XXX: should be optimized?
 310  */
 311
 312 /**
 313  * called for each RPC reported committed
 314  */
 315 static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
 316 {
 317         struct osp_device *d = req->rq_cb_data;
 318
 319         CDEBUG(D_HA, "commit req %p, transno "LPU64"\n", req, req->rq_transno);
 320
 321         if (unlikely(req->rq_transno == 0))
 322                 return;
 323
 324         /* do not do any opd_dyn_rpc_* accounting here
 325          * it's done in osp_sync_interpret sooner or later */
 326
 327         LASSERT(d);
 328         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 329         LASSERT(list_empty(&req->rq_exp_list));
 330
 331         ptlrpc_request_addref(req);
 332
 333         spin_lock(&d->opd_syn_lock);
 334         list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 335         spin_unlock(&d->opd_syn_lock);
 336
 337         /* XXX: some batching wouldn't hurt */
 338         wake_up(&d->opd_syn_waitq);
 339 }
 340
 341 static int osp_sync_interpret(const struct lu_env *env,
 342                               struct ptlrpc_request *req, void *aa, int rc)
 343 {
 344         struct osp_device *d = req->rq_cb_data;
 345
 346         if (req->rq_svc_thread != (void *) OSP_JOB_MAGIC)
 347                 DEBUG_REQ(D_ERROR, req, "bad magic %p\n", req->rq_svc_thread);
 348         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 349         LASSERT(d);
 350
 351         CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
 352                atomic_read(&req->rq_refcount),
 353                rc, (unsigned) req->rq_transno);
 354         LASSERT(rc || req->rq_transno);
 355
 356         if (rc == -ENOENT) {
 357                 /*
 358                  * we tried to destroy object or update attributes,
 359                  * but object doesn't exist anymore - cancell llog record
 360                  */
 361                 LASSERT(req->rq_transno == 0);
 362                 LASSERT(list_empty(&req->rq_exp_list));
 363
 364                 ptlrpc_request_addref(req);
 365
 366                 spin_lock(&d->opd_syn_lock);
 367                 list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
 368                 spin_unlock(&d->opd_syn_lock);
 369
 370                 wake_up(&d->opd_syn_waitq);
 371         } else if (rc) {
 372                 struct obd_import *imp = req->rq_import;
 373                 /*
 374                  * error happened, we'll try to repeat on next boot ?
 375                  */
 376                 LASSERTF(req->rq_transno == 0 ||
 377                          req->rq_import_generation < imp->imp_generation,
 378                          "transno "LPU64", rc %d, gen: req %d, imp %d\n",
 379                          req->rq_transno, rc, req->rq_import_generation,
 380                          imp->imp_generation);
 381                 if (req->rq_transno == 0) {
 382                         /* this is the last time we see the request
 383                          * if transno is not zero, then commit cb
 384                          * will be called at some point */
 385                         LASSERT(d->opd_syn_rpc_in_progress > 0);
 386                         spin_lock(&d->opd_syn_lock);
 387                         d->opd_syn_rpc_in_progress--;
 388                         spin_unlock(&d->opd_syn_lock);
 389                 }
 390
 391                 wake_up(&d->opd_syn_waitq);
 392         } else if (d->opd_pre != NULL &&
 393                    unlikely(d->opd_pre_status == -ENOSPC)) {
 394                 /*
 395                  * if current status is -ENOSPC (lack of free space on OST)
 396                  * then we should poll OST immediately once object destroy
 397                  * is replied
 398                  */
 399                 osp_statfs_need_now(d);
 400         }
 401
 402         LASSERT(d->opd_syn_rpc_in_flight > 0);
 403         spin_lock(&d->opd_syn_lock);
 404         d->opd_syn_rpc_in_flight--;
 405         spin_unlock(&d->opd_syn_lock);
 406         if (unlikely(atomic_read(&d->opd_syn_barrier) > 0))
 407                 wake_up(&d->opd_syn_barrier_waitq);
 408         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 409                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 410                d->opd_syn_rpc_in_progress);
 411
 412         osp_sync_check_for_work(d);
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * the function walks through list of committed locally changes
 419  * and send them to RPC until the pipe is full
 420  */
 421 static void osp_sync_send_new_rpc(struct osp_device *d,
 422                                   struct ptlrpc_request *req)
 423 {
 424         LASSERT(d->opd_syn_rpc_in_flight <= d->opd_syn_max_rpc_in_flight);
 425         LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 426
 427         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 428 }
 429
 430 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
 431                                                struct llog_handle *llh,
 432                                                struct llog_rec_hdr *h,
 433                                                ost_cmd_t op,
 434                                                const struct req_format *format)
 435 {
 436         struct ptlrpc_request   *req;
 437         struct ost_body         *body;
 438         struct obd_import       *imp;
 439         int                      rc;
 440
 441         /* Prepare the request */
 442         imp = d->opd_obd->u.cli.cl_import;
 443         LASSERT(imp);
 444         req = ptlrpc_request_alloc(imp, format);
 445         if (req == NULL)
 446                 RETURN(ERR_PTR(-ENOMEM));
 447
 448         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
 449         if (rc) {
 450                 ptlrpc_req_finished(req);
 451                 return ERR_PTR(rc);
 452         }
 453
 454         /*
 455          * this is a trick: to save on memory allocations we put cookie
 456          * into the request, but don't set corresponded flag in o_valid
 457          * so that OST doesn't interpret this cookie. once the request
 458          * is committed on OST we take cookie from the request and cancel
 459          */
 460         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 461         LASSERT(body);
 462         body->oa.o_lcookie.lgc_lgl = llh->lgh_id;
 463         body->oa.o_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 464         body->oa.o_lcookie.lgc_index = h->lrh_index;
 465         INIT_LIST_HEAD(&req->rq_exp_list);
 466         req->rq_svc_thread = (void *) OSP_JOB_MAGIC;
 467
 468         req->rq_interpret_reply = osp_sync_interpret;
 469         req->rq_commit_cb = osp_sync_request_commit_cb;
 470         req->rq_cb_data = d;
 471
 472         ptlrpc_request_set_replen(req);
 473
 474         return req;
 475 }
 476
 477 static int osp_sync_new_setattr_job(struct osp_device *d,
 478                                     struct llog_handle *llh,
 479                                     struct llog_rec_hdr *h)
 480 {
 481         struct llog_setattr64_rec       *rec = (struct llog_setattr64_rec *)h;
 482         struct ptlrpc_request           *req;
 483         struct ost_body                 *body;
 484
 485         ENTRY;
 486         LASSERT(h->lrh_type == MDS_SETATTR64_REC);
 487
 488         /* lsr_valid can only be 0 or have OBD_MD_{FLUID,FLGID} set,
 489          * so no bits other than these should be set. */
 490         if ((rec->lsr_valid & ~(OBD_MD_FLUID | OBD_MD_FLGID)) != 0) {
 491                 CERROR("%s: invalid setattr record, lsr_valid:"LPU64"\n",
 492                        d->opd_obd->obd_name, rec->lsr_valid);
 493                 /* return 0 so that sync thread can continue processing
 494                  * other records. */
 495                 RETURN(0);
 496         }
 497
 498         req = osp_sync_new_job(d, llh, h, OST_SETATTR, &RQF_OST_SETATTR);
 499         if (IS_ERR(req))
 500                 RETURN(PTR_ERR(req));
 501
 502         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 503         LASSERT(body);
 504         body->oa.o_oi = rec->lsr_oi;
 505         body->oa.o_uid = rec->lsr_uid;
 506         body->oa.o_gid = rec->lsr_gid;
 507         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
 508         /* old setattr record (prior 2.6.0) doesn't have 'valid' stored,
 509          * we assume that both UID and GID are valid in that case. */
 510         if (rec->lsr_valid == 0)
 511                 body->oa.o_valid |= (OBD_MD_FLUID | OBD_MD_FLGID);
 512         else
 513                 body->oa.o_valid |= rec->lsr_valid;
 514
 515         osp_sync_send_new_rpc(d, req);
 516         RETURN(1);
 517 }
 518
 519 static int osp_sync_new_unlink_job(struct osp_device *d,
 520                                    struct llog_handle *llh,
 521                                    struct llog_rec_hdr *h)
 522 {
 523         struct llog_unlink_rec  *rec = (struct llog_unlink_rec *)h;
 524         struct ptlrpc_request   *req;
 525         struct ost_body         *body;
 526
 527         ENTRY;
 528         LASSERT(h->lrh_type == MDS_UNLINK_REC);
 529
 530         req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
 531         if (IS_ERR(req))
 532                 RETURN(PTR_ERR(req));
 533
 534         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 535         LASSERT(body);
 536         ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
 537         ostid_set_id(&body->oa.o_oi, rec->lur_oid);
 538         body->oa.o_misc = rec->lur_count;
 539         body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
 540         if (rec->lur_count)
 541                 body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
 542
 543         osp_sync_send_new_rpc(d, req);
 544         RETURN(1);
 545 }
 546
 547 static int osp_prep_unlink_update_req(const struct lu_env *env,
 548                                       struct osp_device *osp,
 549                                       struct llog_handle *llh,
 550                                       struct llog_rec_hdr *h,
 551                                       struct ptlrpc_request **reqp)
 552 {
 553         struct llog_unlink64_rec        *rec = (struct llog_unlink64_rec *)h;
 554         struct dt_update_request        *update = NULL;
 555         struct ptlrpc_request           *req;
 556         const char                      *buf;
 557         struct llog_cookie              lcookie;
 558         int                             size;
 559         int                             rc;
 560         ENTRY;
 561
 562         update = out_create_update_req(&osp->opd_dt_dev);
 563         if (IS_ERR(update))
 564                 RETURN(PTR_ERR(update));
 565
 566         /* This can only happens for unlink slave directory, so decrease
 567          * ref for ".." and "." */
 568         rc = out_insert_update(env, update, OUT_REF_DEL, &rec->lur_fid, 0,
 569                                NULL, NULL);
 570         if (rc != 0)
 571                 GOTO(out, rc);
 572
 573         rc = out_insert_update(env, update, OUT_REF_DEL, &rec->lur_fid, 0,
 574                                NULL, NULL);
 575         if (rc != 0)
 576                 GOTO(out, rc);
 577
 578         lcookie.lgc_lgl = llh->lgh_id;
 579         lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 580         lcookie.lgc_index = h->lrh_index;
 581         size = sizeof(lcookie);
 582         buf = (const char *)&lcookie;
 583
 584         rc = out_insert_update(env, update, OUT_DESTROY, &rec->lur_fid, 1,
 585                                &size, &buf);
 586         if (rc != 0)
 587                 GOTO(out, rc);
 588
 589         rc = out_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
 590                                  update->dur_req, &req);
 591         if (rc != 0)
 592                 GOTO(out, rc);
 593
 594         INIT_LIST_HEAD(&req->rq_exp_list);
 595         req->rq_svc_thread = (void *)OSP_JOB_MAGIC;
 596
 597         req->rq_interpret_reply = osp_sync_interpret;
 598         req->rq_commit_cb = osp_sync_request_commit_cb;
 599         req->rq_cb_data = osp;
 600
 601         ptlrpc_request_set_replen(req);
 602         *reqp = req;
 603 out:
 604         if (update != NULL)
 605                 out_destroy_update_req(update);
 606
 607         RETURN(rc);
 608 }
 609
 610 static int osp_sync_new_unlink64_job(const struct lu_env *env,
 611                                      struct osp_device *d,
 612                                      struct llog_handle *llh,
 613                                      struct llog_rec_hdr *h)
 614 {
 615         struct llog_unlink64_rec        *rec = (struct llog_unlink64_rec *)h;
 616         struct ptlrpc_request           *req = NULL;
 617         struct ost_body                 *body;
 618         int                              rc;
 619
 620         ENTRY;
 621         LASSERT(h->lrh_type == MDS_UNLINK64_REC);
 622
 623         if (d->opd_connect_mdt) {
 624                 rc = osp_prep_unlink_update_req(env, d, llh, h, &req);
 625                 if (rc != 0)
 626                         RETURN(rc);
 627         } else {
 628                 req = osp_sync_new_job(d, llh, h, OST_DESTROY,
 629                                        &RQF_OST_DESTROY);
 630                 if (IS_ERR(req))
 631                         RETURN(PTR_ERR(req));
 632
 633                 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 634                 if (body == NULL)
 635                         RETURN(-EFAULT);
 636                 rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
 637                 if (rc < 0)
 638                         RETURN(rc);
 639                 body->oa.o_misc = rec->lur_count;
 640                 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
 641                                    OBD_MD_FLOBJCOUNT;
 642         }
 643         osp_sync_send_new_rpc(d, req);
 644         RETURN(1);
 645 }
 646
 647 static int osp_sync_process_record(const struct lu_env *env,
 648                                    struct osp_device *d,
 649                                    struct llog_handle *llh,
 650                                    struct llog_rec_hdr *rec)
 651 {
 652         struct llog_cookie       cookie;
 653         int                      rc = 0;
 654
 655         cookie.lgc_lgl = llh->lgh_id;
 656         cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 657         cookie.lgc_index = rec->lrh_index;
 658
 659         if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
 660                 struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
 661
 662                 /* we're waiting for the record generated by this instance */
 663                 LASSERT(d->opd_syn_prev_done == 0);
 664                 if (!memcmp(&d->opd_syn_generation, &gen->lgr_gen,
 665                             sizeof(gen->lgr_gen))) {
 666                         CDEBUG(D_HA, "processed all old entries\n");
 667                         d->opd_syn_prev_done = 1;
 668                 }
 669
 670                 /* cancel any generation record */
 671                 rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
 672                                              1, &cookie);
 673
 674                 return rc;
 675         }
 676
 677         /*
 678          * now we prepare and fill requests to OST, put them on the queue
 679          * and fire after next commit callback
 680          */
 681
 682         /* notice we increment counters before sending RPC, to be consistent
 683          * in RPC interpret callback which may happen very quickly */
 684         spin_lock(&d->opd_syn_lock);
 685         d->opd_syn_rpc_in_flight++;
 686         d->opd_syn_rpc_in_progress++;
 687         spin_unlock(&d->opd_syn_lock);
 688
 689         switch (rec->lrh_type) {
 690         /* case MDS_UNLINK_REC is kept for compatibility */
 691         case MDS_UNLINK_REC:
 692                 rc = osp_sync_new_unlink_job(d, llh, rec);
 693                 break;
 694         case MDS_UNLINK64_REC:
 695                 rc = osp_sync_new_unlink64_job(env, d, llh, rec);
 696                 break;
 697         case MDS_SETATTR64_REC:
 698                 rc = osp_sync_new_setattr_job(d, llh, rec);
 699                 break;
 700         default:
 701                 CERROR("%s: unknown record type: %x\n", d->opd_obd->obd_name,
 702                        rec->lrh_type);
 703                 /* we should continue processing */
 704         }
 705
 706         /* rc > 0 means sync RPC being added to the queue */
 707         if (likely(rc > 0)) {
 708                 spin_lock(&d->opd_syn_lock);
 709                 if (d->opd_syn_prev_done) {
 710                         LASSERT(d->opd_syn_changes > 0);
 711                         LASSERT(rec->lrh_id <= d->opd_syn_last_committed_id);
 712                         /*
 713                          * NOTE: it's possible to meet same id if
 714                          * OST stores few stripes of same file
 715                          */
 716                         if (rec->lrh_id > d->opd_syn_last_processed_id) {
 717                                 d->opd_syn_last_processed_id = rec->lrh_id;
 718                                 wake_up(&d->opd_syn_barrier_waitq);
 719                         }
 720
 721                         d->opd_syn_changes--;
 722                 }
 723                 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 724                        d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 725                        d->opd_syn_rpc_in_progress);
 726                 spin_unlock(&d->opd_syn_lock);
 727                 rc = 0;
 728         } else {
 729                 spin_lock(&d->opd_syn_lock);
 730                 d->opd_syn_rpc_in_flight--;
 731                 d->opd_syn_rpc_in_progress--;
 732                 spin_unlock(&d->opd_syn_lock);
 733         }
 734
 735         CDEBUG(D_HA, "found record %x, %d, idx %u, id %u: %d\n",
 736                rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id, rc);
 737         return rc;
 738 }
 739
 740 static void osp_sync_process_committed(const struct lu_env *env,
 741                                        struct osp_device *d)
 742 {
 743         struct obd_device       *obd = d->opd_obd;
 744         struct obd_import       *imp = obd->u.cli.cl_import;
 745         struct ost_body         *body;
 746         struct ptlrpc_request   *req, *tmp;
 747         struct llog_ctxt        *ctxt;
 748         struct llog_handle      *llh;
 749         struct list_head         list;
 750         int                      rc, done = 0;
 751
 752         ENTRY;
 753
 754         if (list_empty(&d->opd_syn_committed_there))
 755                 return;
 756
 757         /*
 758          * if current status is -ENOSPC (lack of free space on OST)
 759          * then we should poll OST immediately once object destroy
 760          * is committed.
 761          * notice: we do this upon commit as well because some backends
 762          * (like DMU) do not release space right away.
 763          */
 764         if (d->opd_pre != NULL && unlikely(d->opd_pre_status == -ENOSPC))
 765                 osp_statfs_need_now(d);
 766
 767         /*
 768          * now cancel them all
 769          * XXX: can we improve this using some batching?
 770          *      with batch RPC that'll happen automatically?
 771          * XXX: can we store ctxt in lod_device and save few cycles ?
 772          */
 773         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 774         LASSERT(ctxt);
 775
 776         llh = ctxt->loc_handle;
 777         LASSERT(llh);
 778
 779         INIT_LIST_HEAD(&list);
 780         spin_lock(&d->opd_syn_lock);
 781         list_splice(&d->opd_syn_committed_there, &list);
 782         INIT_LIST_HEAD(&d->opd_syn_committed_there);
 783         spin_unlock(&d->opd_syn_lock);
 784
 785         list_for_each_entry_safe(req, tmp, &list, rq_exp_list) {
 786                 struct llog_cookie *lcookie = NULL;
 787
 788                 LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
 789                 list_del_init(&req->rq_exp_list);
 790
 791                 if (d->opd_connect_mdt) {
 792                         struct object_update_request *ureq;
 793                         struct object_update *update;
 794                         ureq = req_capsule_client_get(&req->rq_pill,
 795                                                       &RMF_OUT_UPDATE);
 796                         LASSERT(ureq != NULL &&
 797                                 ureq->ourq_magic == UPDATE_REQUEST_MAGIC);
 798
 799                         /* 1st/2nd is for decref . and .., 3rd one is for
 800                          * destroy, where the log cookie is stored.
 801                          * See osp_prep_unlink_update_req */
 802                         update = object_update_request_get(ureq, 2, NULL);
 803                         LASSERT(update != NULL);
 804                         lcookie = object_update_param_get(update, 0, NULL);
 805                         LASSERT(lcookie != NULL);
 806                 } else {
 807                         body = req_capsule_client_get(&req->rq_pill,
 808                                                       &RMF_OST_BODY);
 809                         LASSERT(body);
 810                         lcookie = &body->oa.o_lcookie;
 811                 }
 812                 /* import can be closing, thus all commit cb's are
 813                  * called we can check committness directly */
 814                 if (req->rq_transno <= imp->imp_peer_committed_transno) {
 815                         rc = llog_cat_cancel_records(env, llh, 1, lcookie);
 816                         if (rc)
 817                                 CERROR("%s: can't cancel record: %d\n",
 818                                        obd->obd_name, rc);
 819                 } else {
 820                         DEBUG_REQ(D_HA, req, "not committed");
 821                 }
 822
 823                 ptlrpc_req_finished(req);
 824                 done++;
 825         }
 826
 827         llog_ctxt_put(ctxt);
 828
 829         LASSERT(d->opd_syn_rpc_in_progress >= done);
 830         spin_lock(&d->opd_syn_lock);
 831         d->opd_syn_rpc_in_progress -= done;
 832         spin_unlock(&d->opd_syn_lock);
 833         CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
 834                d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
 835                d->opd_syn_rpc_in_progress);
 836
 837         osp_sync_check_for_work(d);
 838
 839         /* wake up the thread if requested to stop:
 840          * it might be waiting for in-progress to complete */
 841         if (unlikely(osp_sync_running(d) == 0))
 842                 wake_up(&d->opd_syn_waitq);
 843
 844         EXIT;
 845 }
 846
 847 /*
 848  * this is where most of queues processing happens
 849  */
 850 static int osp_sync_process_queues(const struct lu_env *env,
 851                                    struct llog_handle *llh,
 852                                    struct llog_rec_hdr *rec,
 853                                    void *data)
 854 {
 855         struct osp_device       *d = data;
 856         int                      rc;
 857
 858         do {
 859                 struct l_wait_info lwi = { 0 };
 860
 861                 if (!osp_sync_running(d)) {
 862                         CDEBUG(D_HA, "stop llog processing\n");
 863                         return LLOG_PROC_BREAK;
 864                 }
 865
 866                 /* process requests committed by OST */
 867                 osp_sync_process_committed(env, d);
 868
 869                 /* if we there are changes to be processed and we have
 870                  * resources for this ... do now */
 871                 if (osp_sync_can_process_new(d, rec)) {
 872                         if (llh == NULL) {
 873                                 /* ask llog for another record */
 874                                 CDEBUG(D_HA, "%lu changes, %u in progress, %u in flight\n",
 875                                        d->opd_syn_changes,
 876                                        d->opd_syn_rpc_in_progress,
 877                                        d->opd_syn_rpc_in_flight);
 878                                 return 0;
 879                         }
 880
 881                         /*
 882                          * try to send, in case of disconnection, suspend
 883                          * processing till we can send this request
 884                          */
 885                         do {
 886                                 rc = osp_sync_process_record(env, d, llh, rec);
 887                                 /*
 888                                  * XXX: probably different handling is needed
 889                                  * for some bugs, like immediate exit or if
 890                                  * OSP gets inactive
 891                                  */
 892                                 if (rc) {
 893                                         CERROR("can't send: %d\n", rc);
 894                                         l_wait_event(d->opd_syn_waitq,
 895                                                      !osp_sync_running(d) ||
 896                                                      osp_sync_has_work(d),
 897                                                      &lwi);
 898                                 }
 899                         } while (rc != 0 && osp_sync_running(d));
 900
 901                         llh = NULL;
 902                         rec = NULL;
 903                 }
 904
 905                 if (d->opd_syn_last_processed_id == d->opd_syn_last_used_id)
 906                         osp_sync_remove_from_tracker(d);
 907
 908                 l_wait_event(d->opd_syn_waitq,
 909                              !osp_sync_running(d) ||
 910                              osp_sync_can_process_new(d, rec) ||
 911                              !list_empty(&d->opd_syn_committed_there),
 912                              &lwi);
 913         } while (1);
 914 }
 915
 916 /*
 917  * this thread runs llog_cat_process() scanner calling our callback
 918  * to process llog records. in the callback we implement tricky
 919  * state machine as we don't want to start scanning of the llog again
 920  * and again, also we don't want to process too many records and send
 921  * too many RPCs a time. so, depending on current load (num of changes
 922  * being synced to OST) the callback can suspend awaiting for some
 923  * new conditions, like syncs completed.
 924  *
 925  * in order to process llog records left by previous boots and to allow
 926  * llog_process_thread() to find something (otherwise it'd just exit
 927  * immediately) we add a special GENERATATION record on each boot.
 928  */
 929 static int osp_sync_thread(void *_arg)
 930 {
 931         struct osp_device       *d = _arg;
 932         struct ptlrpc_thread    *thread = &d->opd_syn_thread;
 933         struct l_wait_info       lwi = { 0 };
 934         struct llog_ctxt        *ctxt;
 935         struct obd_device       *obd = d->opd_obd;
 936         struct llog_handle      *llh;
 937         struct lu_env            env;
 938         int                      rc, count;
 939
 940         ENTRY;
 941
 942         rc = lu_env_init(&env, LCT_LOCAL);
 943         if (rc) {
 944                 CERROR("%s: can't initialize env: rc = %d\n",
 945                        obd->obd_name, rc);
 946                 RETURN(rc);
 947         }
 948
 949         spin_lock(&d->opd_syn_lock);
 950         thread->t_flags = SVC_RUNNING;
 951         spin_unlock(&d->opd_syn_lock);
 952         wake_up(&thread->t_ctl_waitq);
 953
 954         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
 955         if (ctxt == NULL) {
 956                 CERROR("can't get appropriate context\n");
 957                 GOTO(out, rc = -EINVAL);
 958         }
 959
 960         llh = ctxt->loc_handle;
 961         if (llh == NULL) {
 962                 CERROR("can't get llh\n");
 963                 llog_ctxt_put(ctxt);
 964                 GOTO(out, rc = -EINVAL);
 965         }
 966
 967         rc = llog_cat_process(&env, llh, osp_sync_process_queues, d, 0, 0);
 968         LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
 969                  "%lu changes, %u in progress, %u in flight: %d\n",
 970                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 971                  d->opd_syn_rpc_in_flight, rc);
 972
 973         /* we don't expect llog_process_thread() to exit till umount */
 974         LASSERTF(thread->t_flags != SVC_RUNNING,
 975                  "%lu changes, %u in progress, %u in flight\n",
 976                  d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 977                  d->opd_syn_rpc_in_flight);
 978
 979         /* wait till all the requests are completed */
 980         count = 0;
 981         while (d->opd_syn_rpc_in_progress > 0) {
 982                 osp_sync_process_committed(&env, d);
 983
 984                 lwi = LWI_TIMEOUT(cfs_time_seconds(5), NULL, NULL);
 985                 rc = l_wait_event(d->opd_syn_waitq,
 986                                   d->opd_syn_rpc_in_progress == 0,
 987                                   &lwi);
 988                 if (rc == -ETIMEDOUT)
 989                         count++;
 990                 LASSERTF(count < 10, "%s: %d %d %sempty\n",
 991                          d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
 992                          d->opd_syn_rpc_in_flight,
 993                          list_empty(&d->opd_syn_committed_there) ? "" : "!");
 994
 995         }
 996
 997         llog_cat_close(&env, llh);
 998         rc = llog_cleanup(&env, ctxt);
 999         if (rc)
1000                 CERROR("can't cleanup llog: %d\n", rc);
1001 out:
1002         LASSERTF(d->opd_syn_rpc_in_progress == 0,
1003                  "%s: %d %d %sempty\n",
1004                  d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
1005                  d->opd_syn_rpc_in_flight,
1006                  list_empty(&d->opd_syn_committed_there) ? "" : "!");
1007
1008         thread->t_flags = SVC_STOPPED;
1009
1010         wake_up(&thread->t_ctl_waitq);
1011
1012         lu_env_fini(&env);
1013
1014         RETURN(0);
1015 }
1016
1017 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
1018 {
1019         struct osp_thread_info  *osi = osp_env_info(env);
1020         struct lu_fid           *fid = &osi->osi_fid;
1021         struct llog_handle      *lgh = NULL;
1022         struct obd_device       *obd = d->opd_obd;
1023         struct llog_ctxt        *ctxt;
1024         int                     rc;
1025
1026         ENTRY;
1027
1028         LASSERT(obd);
1029
1030         /*
1031          * open llog corresponding to our OST
1032          */
1033         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1034         obd->obd_lvfs_ctxt.dt = d->opd_storage;
1035
1036         if (d->opd_connect_mdt)
1037                 lu_local_obj_fid(fid, SLAVE_LLOG_CATALOGS_OID);
1038         else
1039                 lu_local_obj_fid(fid, LLOG_CATALOGS_OID);
1040
1041         rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
1042                                    &osi->osi_cid, fid);
1043         if (rc) {
1044                 CERROR("%s: can't get id from catalogs: rc = %d\n",
1045                        obd->obd_name, rc);
1046                 RETURN(rc);
1047         }
1048
1049         CDEBUG(D_INFO, "%s: Init llog for %d - catid "DOSTID":%x\n",
1050                obd->obd_name, d->opd_index,
1051                POSTID(&osi->osi_cid.lci_logid.lgl_oi),
1052                osi->osi_cid.lci_logid.lgl_ogen);
1053
1054         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, obd,
1055                         &osp_mds_ost_orig_logops);
1056         if (rc)
1057                 RETURN(rc);
1058
1059         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1060         LASSERT(ctxt);
1061
1062         if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
1063                 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid, NULL,
1064                                LLOG_OPEN_EXISTS);
1065                 /* re-create llog if it is missing */
1066                 if (rc == -ENOENT)
1067                         logid_set_id(&osi->osi_cid.lci_logid, 0);
1068                 else if (rc < 0)
1069                         GOTO(out_cleanup, rc);
1070         }
1071
1072         if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
1073                 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
1074                 if (rc < 0)
1075                         GOTO(out_cleanup, rc);
1076                 osi->osi_cid.lci_logid = lgh->lgh_id;
1077         }
1078
1079         LASSERT(lgh != NULL);
1080         ctxt->loc_handle = lgh;
1081
1082         rc = llog_cat_init_and_process(env, lgh);
1083         if (rc)
1084                 GOTO(out_close, rc);
1085
1086         rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
1087                                    &osi->osi_cid, fid);
1088         if (rc)
1089                 GOTO(out_close, rc);
1090
1091         /*
1092          * put a mark in the llog till which we'll be processing
1093          * old records restless
1094          */
1095         d->opd_syn_generation.mnt_cnt = cfs_time_current();
1096         d->opd_syn_generation.conn_cnt = cfs_time_current();
1097
1098         osi->osi_hdr.lrh_type = LLOG_GEN_REC;
1099         osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
1100
1101         memcpy(&osi->osi_gen.lgr_gen, &d->opd_syn_generation,
1102                sizeof(osi->osi_gen.lgr_gen));
1103
1104         rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie);
1105         if (rc < 0)
1106                 GOTO(out_close, rc);
1107         llog_ctxt_put(ctxt);
1108         RETURN(0);
1109 out_close:
1110         llog_cat_close(env, lgh);
1111 out_cleanup:
1112         llog_cleanup(env, ctxt);
1113         RETURN(rc);
1114 }
1115
1116 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
1117 {
1118         struct llog_ctxt *ctxt;
1119
1120         ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1121         if (ctxt != NULL)
1122                 llog_cat_close(env, ctxt->loc_handle);
1123         llog_cleanup(env, ctxt);
1124 }
1125
1126 /*
1127  * initializes sync component of OSP
1128  */
1129 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1130 {
1131         struct l_wait_info       lwi = { 0 };
1132         struct task_struct      *task;
1133         int                      rc;
1134
1135         ENTRY;
1136
1137         rc = osp_sync_id_traction_init(d);
1138         if (rc)
1139                 RETURN(rc);
1140
1141         /*
1142          * initialize llog storing changes
1143          */
1144         rc = osp_sync_llog_init(env, d);
1145         if (rc) {
1146                 CERROR("%s: can't initialize llog: rc = %d\n",
1147                        d->opd_obd->obd_name, rc);
1148                 GOTO(err_id, rc);
1149         }
1150
1151         /*
1152          * Start synchronization thread
1153          */
1154         d->opd_syn_max_rpc_in_flight = OSP_MAX_IN_FLIGHT;
1155         d->opd_syn_max_rpc_in_progress = OSP_MAX_IN_PROGRESS;
1156         spin_lock_init(&d->opd_syn_lock);
1157         init_waitqueue_head(&d->opd_syn_waitq);
1158         init_waitqueue_head(&d->opd_syn_barrier_waitq);
1159         init_waitqueue_head(&d->opd_syn_thread.t_ctl_waitq);
1160         INIT_LIST_HEAD(&d->opd_syn_committed_there);
1161
1162         task = kthread_run(osp_sync_thread, d, "osp-syn-%u-%u",
1163                            d->opd_index, d->opd_group);
1164         if (IS_ERR(task)) {
1165                 rc = PTR_ERR(task);
1166                 CERROR("%s: cannot start sync thread: rc = %d\n",
1167                        d->opd_obd->obd_name, rc);
1168                 GOTO(err_llog, rc);
1169         }
1170
1171         l_wait_event(d->opd_syn_thread.t_ctl_waitq,
1172                      osp_sync_running(d) || osp_sync_stopped(d), &lwi);
1173
1174         RETURN(0);
1175 err_llog:
1176         osp_sync_llog_fini(env, d);
1177 err_id:
1178         osp_sync_id_traction_fini(d);
1179         return rc;
1180 }
1181
1182 int osp_sync_fini(struct osp_device *d)
1183 {
1184         struct ptlrpc_thread *thread = &d->opd_syn_thread;
1185
1186         ENTRY;
1187
1188         thread->t_flags = SVC_STOPPING;
1189         wake_up(&d->opd_syn_waitq);
1190         wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1191
1192         /*
1193          * unregister transaction callbacks only when sync thread
1194          * has finished operations with llog
1195          */
1196         osp_sync_id_traction_fini(d);
1197
1198         RETURN(0);
1199 }
1200
1201 static DEFINE_MUTEX(osp_id_tracker_sem);
1202 static struct list_head osp_id_tracker_list =
1203                 LIST_HEAD_INIT(osp_id_tracker_list);
1204
1205 static void osp_sync_tracker_commit_cb(struct thandle *th, void *cookie)
1206 {
1207         struct osp_id_tracker   *tr = cookie;
1208         struct osp_device       *d;
1209         struct osp_txn_info     *txn;
1210
1211         LASSERT(tr);
1212
1213         txn = osp_txn_info(&th->th_ctx);
1214         if (txn == NULL || txn->oti_current_id < tr->otr_committed_id)
1215                 return;
1216
1217         spin_lock(&tr->otr_lock);
1218         if (likely(txn->oti_current_id > tr->otr_committed_id)) {
1219                 CDEBUG(D_OTHER, "committed: %u -> %u\n",
1220                        tr->otr_committed_id, txn->oti_current_id);
1221                 tr->otr_committed_id = txn->oti_current_id;
1222
1223                 list_for_each_entry(d, &tr->otr_wakeup_list,
1224                                     opd_syn_ontrack) {
1225                         d->opd_syn_last_committed_id = tr->otr_committed_id;
1226                         wake_up(&d->opd_syn_waitq);
1227                 }
1228         }
1229         spin_unlock(&tr->otr_lock);
1230 }
1231
1232 static int osp_sync_id_traction_init(struct osp_device *d)
1233 {
1234         struct osp_id_tracker   *tr, *found = NULL;
1235         int                      rc = 0;
1236
1237         LASSERT(d);
1238         LASSERT(d->opd_storage);
1239         LASSERT(d->opd_syn_tracker == NULL);
1240         INIT_LIST_HEAD(&d->opd_syn_ontrack);
1241
1242         mutex_lock(&osp_id_tracker_sem);
1243         list_for_each_entry(tr, &osp_id_tracker_list, otr_list) {
1244                 if (tr->otr_dev == d->opd_storage) {
1245                         LASSERT(atomic_read(&tr->otr_refcount));
1246                         atomic_inc(&tr->otr_refcount);
1247                         d->opd_syn_tracker = tr;
1248                         found = tr;
1249                         break;
1250                 }
1251         }
1252
1253         if (found == NULL) {
1254                 rc = -ENOMEM;
1255                 OBD_ALLOC_PTR(tr);
1256                 if (tr) {
1257                         d->opd_syn_tracker = tr;
1258                         spin_lock_init(&tr->otr_lock);
1259                         tr->otr_dev = d->opd_storage;
1260                         tr->otr_next_id = 1;
1261                         tr->otr_committed_id = 0;
1262                         atomic_set(&tr->otr_refcount, 1);
1263                         INIT_LIST_HEAD(&tr->otr_wakeup_list);
1264                         list_add(&tr->otr_list, &osp_id_tracker_list);
1265                         tr->otr_tx_cb.dtc_txn_commit =
1266                                                 osp_sync_tracker_commit_cb;
1267                         tr->otr_tx_cb.dtc_cookie = tr;
1268                         tr->otr_tx_cb.dtc_tag = LCT_MD_THREAD;
1269                         dt_txn_callback_add(d->opd_storage, &tr->otr_tx_cb);
1270                         rc = 0;
1271                 }
1272         }
1273         mutex_unlock(&osp_id_tracker_sem);
1274
1275         return rc;
1276 }
1277
1278 static void osp_sync_id_traction_fini(struct osp_device *d)
1279 {
1280         struct osp_id_tracker *tr;
1281
1282         ENTRY;
1283
1284         LASSERT(d);
1285         tr = d->opd_syn_tracker;
1286         if (tr == NULL) {
1287                 EXIT;
1288                 return;
1289         }
1290
1291         osp_sync_remove_from_tracker(d);
1292
1293         mutex_lock(&osp_id_tracker_sem);
1294         if (atomic_dec_and_test(&tr->otr_refcount)) {
1295                 dt_txn_callback_del(d->opd_storage, &tr->otr_tx_cb);
1296                 LASSERT(list_empty(&tr->otr_wakeup_list));
1297                 list_del(&tr->otr_list);
1298                 OBD_FREE_PTR(tr);
1299                 d->opd_syn_tracker = NULL;
1300         }
1301         mutex_unlock(&osp_id_tracker_sem);
1302
1303         EXIT;
1304 }
1305
1306 /*
1307  * generates id for the tracker
1308  */
1309 static __u32 osp_sync_id_get(struct osp_device *d, __u32 id)
1310 {
1311         struct osp_id_tracker *tr;
1312
1313         tr = d->opd_syn_tracker;
1314         LASSERT(tr);
1315
1316         /* XXX: we can improve this introducing per-cpu preallocated ids? */
1317         spin_lock(&tr->otr_lock);
1318         if (unlikely(tr->otr_next_id <= d->opd_syn_last_used_id)) {
1319                 spin_unlock(&tr->otr_lock);
1320                 CERROR("%s: next %u, last synced %lu\n",
1321                        d->opd_obd->obd_name, tr->otr_next_id,
1322                        d->opd_syn_last_used_id);
1323                 LBUG();
1324         }
1325
1326         if (id == 0)
1327                 id = tr->otr_next_id++;
1328         if (id > d->opd_syn_last_used_id)
1329                 d->opd_syn_last_used_id = id;
1330         if (list_empty(&d->opd_syn_ontrack))
1331                 list_add(&d->opd_syn_ontrack, &tr->otr_wakeup_list);
1332         spin_unlock(&tr->otr_lock);
1333         CDEBUG(D_OTHER, "new id %u\n", (unsigned) id);
1334
1335         return id;
1336 }
1337
1338 static void osp_sync_remove_from_tracker(struct osp_device *d)
1339 {
1340         struct osp_id_tracker *tr;
1341
1342         tr = d->opd_syn_tracker;
1343         LASSERT(tr);
1344
1345         if (list_empty(&d->opd_syn_ontrack))
1346                 return;
1347
1348         spin_lock(&tr->otr_lock);
1349         list_del_init(&d->opd_syn_ontrack);
1350         spin_unlock(&tr->otr_lock);
1351 }
1352