lustre/obdclass/llog_cat.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) 2003, 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/obdclass/llog_cat.c
  37  *
  38  * OST<->MDS recovery logging infrastructure.
  39  *
  40  * Invariants in implementation:
  41  * - we do not share logs among different OST<->MDS connections, so that
  42  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  43  *
  44  * Author: Andreas Dilger <adilger@clusterfs.com>
  45  * Author: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
  46  * Author: Mikhail Pershin <mike.pershin@intel.com>
  47  */
  48
  49 #define DEBUG_SUBSYSTEM S_LOG
  50
  51 #ifndef __KERNEL__
  52 #include <liblustre.h>
  53 #endif
  54
  55 #include <obd_class.h>
  56
  57 #include "llog_internal.h"
  58
  59 /* Create a new log handle and add it to the open list.
  60  * This log handle will be closed when all of the records in it are removed.
  61  *
  62  * Assumes caller has already pushed us into the kernel context and is locking.
  63  */
  64 static int llog_cat_new_log(const struct lu_env *env,
  65                             struct llog_handle *cathandle,
  66                             struct llog_handle *loghandle,
  67                             struct thandle *th)
  68 {
  69
  70         struct llog_log_hdr *llh;
  71         struct llog_logid_rec rec = { { 0 }, };
  72         int rc, index, bitmap_size;
  73         ENTRY;
  74
  75         llh = cathandle->lgh_hdr;
  76         bitmap_size = LLOG_BITMAP_SIZE(llh);
  77
  78         index = (cathandle->lgh_last_idx + 1) % bitmap_size;
  79
  80         /* maximum number of available slots in catlog is bitmap_size - 2 */
  81         if (llh->llh_cat_idx == index) {
  82                 CERROR("no free catalog slots for log...\n");
  83                 RETURN(-ENOSPC);
  84         }
  85
  86         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_LLOG_CREATE_FAILED))
  87                 RETURN(-ENOSPC);
  88
  89         rc = llog_create(env, loghandle, th);
  90         /* if llog is already created, no need to initialize it */
  91         if (rc == -EEXIST) {
  92                 RETURN(0);
  93         } else if (rc != 0) {
  94                 CERROR("%s: can't create new plain llog in catalog: rc = %d\n",
  95                        loghandle->lgh_ctxt->loc_obd->obd_name, rc);
  96                 RETURN(rc);
  97         }
  98
  99         rc = llog_init_handle(env, loghandle,
 100                               LLOG_F_IS_PLAIN | LLOG_F_ZAP_WHEN_EMPTY,
 101                               &cathandle->lgh_hdr->llh_tgtuuid);
 102         if (rc)
 103                 GOTO(out_destroy, rc);
 104
 105         if (index == 0)
 106                 index = 1;
 107
 108         spin_lock(&loghandle->lgh_hdr_lock);
 109         llh->llh_count++;
 110         if (ext2_set_bit(index, llh->llh_bitmap)) {
 111                 CERROR("argh, index %u already set in log bitmap?\n",
 112                        index);
 113                 spin_unlock(&loghandle->lgh_hdr_lock);
 114                 LBUG(); /* should never happen */
 115         }
 116         spin_unlock(&loghandle->lgh_hdr_lock);
 117
 118         cathandle->lgh_last_idx = index;
 119         llh->llh_tail.lrt_index = index;
 120
 121         CDEBUG(D_RPCTRACE,"new recovery log "LPX64":%x for index %u of catalog "
 122                LPX64"\n", loghandle->lgh_id.lgl_oid, loghandle->lgh_id.lgl_ogen,
 123                index, cathandle->lgh_id.lgl_oid);
 124         /* build the record for this log in the catalog */
 125         rec.lid_hdr.lrh_len = sizeof(rec);
 126         rec.lid_hdr.lrh_index = index;
 127         rec.lid_hdr.lrh_type = LLOG_LOGID_MAGIC;
 128         rec.lid_id = loghandle->lgh_id;
 129         rec.lid_tail.lrt_len = sizeof(rec);
 130         rec.lid_tail.lrt_index = index;
 131
 132         /* update the catalog: header and record */
 133         rc = llog_write_rec(env, cathandle, &rec.lid_hdr,
 134                             &loghandle->u.phd.phd_cookie, 1, NULL, index, th);
 135         if (rc < 0)
 136                 GOTO(out_destroy, rc);
 137
 138         loghandle->lgh_hdr->llh_cat_idx = index;
 139         RETURN(0);
 140 out_destroy:
 141         llog_destroy(env, loghandle);
 142         RETURN(rc);
 143 }
 144
 145 /* Open an existent log handle and add it to the open list.
 146  * This log handle will be closed when all of the records in it are removed.
 147  *
 148  * Assumes caller has already pushed us into the kernel context and is locking.
 149  * We return a lock on the handle to ensure nobody yanks it from us.
 150  *
 151  * This takes extra reference on llog_handle via llog_handle_get() and require
 152  * this reference to be put by caller using llog_handle_put()
 153  */
 154 int llog_cat_id2handle(const struct lu_env *env, struct llog_handle *cathandle,
 155                        struct llog_handle **res, struct llog_logid *logid)
 156 {
 157         struct llog_handle      *loghandle;
 158         int                      rc = 0;
 159
 160         ENTRY;
 161
 162         if (cathandle == NULL)
 163                 RETURN(-EBADF);
 164
 165         down_write(&cathandle->lgh_lock);
 166         cfs_list_for_each_entry(loghandle, &cathandle->u.chd.chd_head,
 167                                 u.phd.phd_entry) {
 168                 struct llog_logid *cgl = &loghandle->lgh_id;
 169
 170                 if (cgl->lgl_oid == logid->lgl_oid) {
 171                         if (cgl->lgl_ogen != logid->lgl_ogen) {
 172                                 CERROR("%s: log "LPX64" generation %x != %x\n",
 173                                        loghandle->lgh_ctxt->loc_obd->obd_name,
 174                                        logid->lgl_oid, cgl->lgl_ogen,
 175                                        logid->lgl_ogen);
 176                                 continue;
 177                         }
 178                         loghandle->u.phd.phd_cat_handle = cathandle;
 179                         up_write(&cathandle->lgh_lock);
 180                         GOTO(out, rc = 0);
 181                 }
 182         }
 183         up_write(&cathandle->lgh_lock);
 184
 185         rc = llog_open(env, cathandle->lgh_ctxt, &loghandle, logid, NULL,
 186                        LLOG_OPEN_EXISTS);
 187         if (rc < 0) {
 188                 CERROR("%s: error opening log id "LPX64":%x: rc = %d\n",
 189                        cathandle->lgh_ctxt->loc_obd->obd_name,
 190                        logid->lgl_oid, logid->lgl_ogen, rc);
 191                 RETURN(rc);
 192         }
 193
 194         rc = llog_init_handle(env, loghandle, LLOG_F_IS_PLAIN, NULL);
 195         if (rc < 0) {
 196                 llog_close(env, loghandle);
 197                 loghandle = NULL;
 198                 RETURN(rc);
 199         }
 200
 201         down_write(&cathandle->lgh_lock);
 202         cfs_list_add(&loghandle->u.phd.phd_entry, &cathandle->u.chd.chd_head);
 203         up_write(&cathandle->lgh_lock);
 204
 205         loghandle->u.phd.phd_cat_handle = cathandle;
 206         loghandle->u.phd.phd_cookie.lgc_lgl = cathandle->lgh_id;
 207         loghandle->u.phd.phd_cookie.lgc_index =
 208                                 loghandle->lgh_hdr->llh_cat_idx;
 209         EXIT;
 210 out:
 211         llog_handle_get(loghandle);
 212         *res = loghandle;
 213         return 0;
 214 }
 215
 216 int llog_cat_close(const struct lu_env *env, struct llog_handle *cathandle)
 217 {
 218         struct llog_handle      *loghandle, *n;
 219         int                      rc;
 220
 221         ENTRY;
 222
 223         cfs_list_for_each_entry_safe(loghandle, n, &cathandle->u.chd.chd_head,
 224                                      u.phd.phd_entry) {
 225                 struct llog_log_hdr     *llh = loghandle->lgh_hdr;
 226                 int                      index;
 227
 228                 /* unlink open-not-created llogs */
 229                 cfs_list_del_init(&loghandle->u.phd.phd_entry);
 230                 llh = loghandle->lgh_hdr;
 231                 if (loghandle->lgh_obj != NULL && llh != NULL &&
 232                     (llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY) &&
 233                     (llh->llh_count == 1)) {
 234                         rc = llog_destroy(env, loghandle);
 235                         if (rc)
 236                                 CERROR("%s: failure destroying log during "
 237                                        "cleanup: rc = %d\n",
 238                                        loghandle->lgh_ctxt->loc_obd->obd_name,
 239                                        rc);
 240
 241                         index = loghandle->u.phd.phd_cookie.lgc_index;
 242                         llog_cat_cleanup(env, cathandle, NULL, index);
 243                 }
 244                 llog_close(env, loghandle);
 245         }
 246         /* if handle was stored in ctxt, remove it too */
 247         if (cathandle->lgh_ctxt->loc_handle == cathandle)
 248                 cathandle->lgh_ctxt->loc_handle = NULL;
 249         rc = llog_close(env, cathandle);
 250         RETURN(rc);
 251 }
 252 EXPORT_SYMBOL(llog_cat_close);
 253
 254 /**
 255  * lockdep markers for nested struct llog_handle::lgh_lock locking.
 256  */
 257 enum {
 258         LLOGH_CAT,
 259         LLOGH_LOG
 260 };
 261
 262 /** Return the currently active log handle.  If the current log handle doesn't
 263  * have enough space left for the current record, start a new one.
 264  *
 265  * If reclen is 0, we only want to know what the currently active log is,
 266  * otherwise we get a lock on this log so nobody can steal our space.
 267  *
 268  * Assumes caller has already pushed us into the kernel context and is locking.
 269  *
 270  * NOTE: loghandle is write-locked upon successful return
 271  */
 272 static struct llog_handle *llog_cat_current_log(struct llog_handle *cathandle,
 273                                                 struct thandle *th)
 274 {
 275         struct llog_handle *loghandle = NULL;
 276         ENTRY;
 277
 278         down_read_nested(&cathandle->lgh_lock, LLOGH_CAT);
 279         loghandle = cathandle->u.chd.chd_current_log;
 280         if (loghandle) {
 281                 struct llog_log_hdr *llh;
 282
 283                 down_write_nested(&loghandle->lgh_lock, LLOGH_LOG);
 284                 llh = loghandle->lgh_hdr;
 285                 if (llh == NULL ||
 286                     loghandle->lgh_last_idx < LLOG_BITMAP_SIZE(llh) - 1) {
 287                         up_read(&cathandle->lgh_lock);
 288                         RETURN(loghandle);
 289                 } else {
 290                         up_write(&loghandle->lgh_lock);
 291                 }
 292         }
 293         up_read(&cathandle->lgh_lock);
 294
 295         /* time to use next log */
 296
 297         /* first, we have to make sure the state hasn't changed */
 298         down_write_nested(&cathandle->lgh_lock, LLOGH_CAT);
 299         loghandle = cathandle->u.chd.chd_current_log;
 300         if (loghandle) {
 301                 struct llog_log_hdr *llh;
 302
 303                 down_write_nested(&loghandle->lgh_lock, LLOGH_LOG);
 304                 llh = loghandle->lgh_hdr;
 305                 LASSERT(llh);
 306                 if (loghandle->lgh_last_idx < LLOG_BITMAP_SIZE(llh) - 1) {
 307                         up_write(&cathandle->lgh_lock);
 308                         RETURN(loghandle);
 309                 } else {
 310                         up_write(&loghandle->lgh_lock);
 311                 }
 312         }
 313
 314         CDEBUG(D_INODE, "use next log\n");
 315
 316         loghandle = cathandle->u.chd.chd_next_log;
 317         cathandle->u.chd.chd_current_log = loghandle;
 318         cathandle->u.chd.chd_next_log = NULL;
 319         down_write_nested(&loghandle->lgh_lock, LLOGH_LOG);
 320         up_write(&cathandle->lgh_lock);
 321         LASSERT(loghandle);
 322         RETURN(loghandle);
 323 }
 324
 325 /* Add a single record to the recovery log(s) using a catalog
 326  * Returns as llog_write_record
 327  *
 328  * Assumes caller has already pushed us into the kernel context.
 329  */
 330 int llog_cat_add_rec(const struct lu_env *env, struct llog_handle *cathandle,
 331                      struct llog_rec_hdr *rec, struct llog_cookie *reccookie,
 332                      void *buf, struct thandle *th)
 333 {
 334         struct llog_handle *loghandle;
 335         int rc;
 336         ENTRY;
 337
 338         LASSERT(rec->lrh_len <= LLOG_CHUNK_SIZE);
 339         loghandle = llog_cat_current_log(cathandle, th);
 340         LASSERT(!IS_ERR(loghandle));
 341
 342         /* loghandle is already locked by llog_cat_current_log() for us */
 343         if (!llog_exist(loghandle)) {
 344                 rc = llog_cat_new_log(env, cathandle, loghandle, th);
 345                 if (rc < 0) {
 346                         up_write(&loghandle->lgh_lock);
 347                         RETURN(rc);
 348                 }
 349         }
 350         /* now let's try to add the record */
 351         rc = llog_write_rec(env, loghandle, rec, reccookie, 1, buf, -1, th);
 352         if (rc < 0)
 353                 CDEBUG_LIMIT(rc == -ENOSPC ? D_HA : D_ERROR,
 354                              "llog_write_rec %d: lh=%p\n", rc, loghandle);
 355         up_write(&loghandle->lgh_lock);
 356         if (rc == -ENOSPC) {
 357                 /* try to use next log */
 358                 loghandle = llog_cat_current_log(cathandle, th);
 359                 LASSERT(!IS_ERR(loghandle));
 360                 /* new llog can be created concurrently */
 361                 if (!llog_exist(loghandle)) {
 362                         rc = llog_cat_new_log(env, cathandle, loghandle, th);
 363                         if (rc < 0) {
 364                                 up_write(&loghandle->lgh_lock);
 365                                 RETURN(rc);
 366                         }
 367                 }
 368                 /* now let's try to add the record */
 369                 rc = llog_write_rec(env, loghandle, rec, reccookie, 1, buf,
 370                                     -1, th);
 371                 if (rc < 0)
 372                         CERROR("llog_write_rec %d: lh=%p\n", rc, loghandle);
 373                 up_write(&loghandle->lgh_lock);
 374         }
 375
 376         RETURN(rc);
 377 }
 378 EXPORT_SYMBOL(llog_cat_add_rec);
 379
 380 int llog_cat_declare_add_rec(const struct lu_env *env,
 381                              struct llog_handle *cathandle,
 382                              struct llog_rec_hdr *rec, struct thandle *th)
 383 {
 384         struct llog_handle      *loghandle, *next;
 385         int                      rc = 0;
 386
 387         ENTRY;
 388
 389         if (cathandle->u.chd.chd_current_log == NULL) {
 390                 /* declare new plain llog */
 391                 down_write(&cathandle->lgh_lock);
 392                 if (cathandle->u.chd.chd_current_log == NULL) {
 393                         rc = llog_open(env, cathandle->lgh_ctxt, &loghandle,
 394                                        NULL, NULL, LLOG_OPEN_NEW);
 395                         if (rc == 0) {
 396                                 cathandle->u.chd.chd_current_log = loghandle;
 397                                 cfs_list_add_tail(&loghandle->u.phd.phd_entry,
 398                                                   &cathandle->u.chd.chd_head);
 399                         }
 400                 }
 401                 up_write(&cathandle->lgh_lock);
 402         } else if (cathandle->u.chd.chd_next_log == NULL) {
 403                 /* declare next plain llog */
 404                 down_write(&cathandle->lgh_lock);
 405                 if (cathandle->u.chd.chd_next_log == NULL) {
 406                         rc = llog_open(env, cathandle->lgh_ctxt, &loghandle,
 407                                        NULL, NULL, LLOG_OPEN_NEW);
 408                         if (rc == 0) {
 409                                 cathandle->u.chd.chd_next_log = loghandle;
 410                                 cfs_list_add_tail(&loghandle->u.phd.phd_entry,
 411                                                   &cathandle->u.chd.chd_head);
 412                         }
 413                 }
 414                 up_write(&cathandle->lgh_lock);
 415         }
 416         if (rc)
 417                 GOTO(out, rc);
 418
 419         if (!llog_exist(cathandle->u.chd.chd_current_log)) {
 420                 rc = llog_declare_create(env, cathandle->u.chd.chd_current_log,
 421                                          th);
 422                 if (rc)
 423                         GOTO(out, rc);
 424                 llog_declare_write_rec(env, cathandle, NULL, -1, th);
 425         }
 426         /* declare records in the llogs */
 427         rc = llog_declare_write_rec(env, cathandle->u.chd.chd_current_log,
 428                                     rec, -1, th);
 429         if (rc)
 430                 GOTO(out, rc);
 431
 432         next = cathandle->u.chd.chd_next_log;
 433         if (next) {
 434                 if (!llog_exist(next)) {
 435                         rc = llog_declare_create(env, next, th);
 436                         llog_declare_write_rec(env, cathandle, NULL, -1, th);
 437                 }
 438                 llog_declare_write_rec(env, next, rec, -1, th);
 439         }
 440 out:
 441         RETURN(rc);
 442 }
 443 EXPORT_SYMBOL(llog_cat_declare_add_rec);
 444
 445 int llog_cat_add(const struct lu_env *env, struct llog_handle *cathandle,
 446                  struct llog_rec_hdr *rec, struct llog_cookie *reccookie,
 447                  void *buf)
 448 {
 449         struct llog_ctxt        *ctxt;
 450         struct dt_device        *dt;
 451         struct thandle          *th = NULL;
 452         int                      rc;
 453
 454         ctxt = cathandle->lgh_ctxt;
 455         LASSERT(ctxt);
 456         LASSERT(ctxt->loc_exp);
 457
 458         if (cathandle->lgh_obj != NULL) {
 459                 dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
 460                 LASSERT(dt);
 461
 462                 th = dt_trans_create(env, dt);
 463                 if (IS_ERR(th))
 464                         RETURN(PTR_ERR(th));
 465
 466                 rc = llog_cat_declare_add_rec(env, cathandle, rec, th);
 467                 if (rc)
 468                         GOTO(out_trans, rc);
 469
 470                 rc = dt_trans_start_local(env, dt, th);
 471                 if (rc)
 472                         GOTO(out_trans, rc);
 473                 rc = llog_cat_add_rec(env, cathandle, rec, reccookie, buf, th);
 474 out_trans:
 475                 dt_trans_stop(env, dt, th);
 476         } else { /* lvfs compat code */
 477                 LASSERT(cathandle->lgh_file != NULL);
 478                 rc = llog_cat_declare_add_rec(env, cathandle, rec, th);
 479                 if (rc == 0)
 480                         rc = llog_cat_add_rec(env, cathandle, rec, reccookie,
 481                                               buf, th);
 482         }
 483         RETURN(rc);
 484 }
 485 EXPORT_SYMBOL(llog_cat_add);
 486
 487 /* For each cookie in the cookie array, we clear the log in-use bit and either:
 488  * - the log is empty, so mark it free in the catalog header and delete it
 489  * - the log is not empty, just write out the log header
 490  *
 491  * The cookies may be in different log files, so we need to get new logs
 492  * each time.
 493  *
 494  * Assumes caller has already pushed us into the kernel context.
 495  */
 496 int llog_cat_cancel_records(const struct lu_env *env,
 497                             struct llog_handle *cathandle, int count,
 498                             struct llog_cookie *cookies)
 499 {
 500         int i, index, rc = 0, failed = 0;
 501
 502         ENTRY;
 503
 504         for (i = 0; i < count; i++, cookies++) {
 505                 struct llog_handle      *loghandle;
 506                 struct llog_logid       *lgl = &cookies->lgc_lgl;
 507                 int                      lrc;
 508
 509                 rc = llog_cat_id2handle(env, cathandle, &loghandle, lgl);
 510                 if (rc) {
 511                         CERROR("%s: cannot find handle for llog "LPX64": %d\n",
 512                                cathandle->lgh_ctxt->loc_obd->obd_name,
 513                                lgl->lgl_oid, rc);
 514                         failed++;
 515                         continue;
 516                 }
 517
 518                 lrc = llog_cancel_rec(env, loghandle, cookies->lgc_index);
 519                 if (lrc == 1) {          /* log has been destroyed */
 520                         index = loghandle->u.phd.phd_cookie.lgc_index;
 521                         rc = llog_cat_cleanup(env, cathandle, loghandle,
 522                                               index);
 523                 } else if (lrc == -ENOENT) {
 524                         if (rc == 0) /* ENOENT shouldn't rewrite any error */
 525                                 rc = lrc;
 526                 } else if (lrc < 0) {
 527                         failed++;
 528                         rc = lrc;
 529                 }
 530                 llog_handle_put(loghandle);
 531         }
 532         if (rc)
 533                 CERROR("%s: fail to cancel %d of %d llog-records: rc = %d\n",
 534                        cathandle->lgh_ctxt->loc_obd->obd_name, failed, count,
 535                        rc);
 536
 537         RETURN(rc);
 538 }
 539 EXPORT_SYMBOL(llog_cat_cancel_records);
 540
 541 int llog_cat_process_cb(const struct lu_env *env, struct llog_handle *cat_llh,
 542                         struct llog_rec_hdr *rec, void *data)
 543 {
 544         struct llog_process_data *d = data;
 545         struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
 546         struct llog_handle *llh;
 547         int rc;
 548
 549         ENTRY;
 550         if (rec->lrh_type != LLOG_LOGID_MAGIC) {
 551                 CERROR("invalid record in catalog\n");
 552                 RETURN(-EINVAL);
 553         }
 554         CDEBUG(D_HA, "processing log "LPX64":%x at index %u of catalog "
 555                LPX64"\n", lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
 556                rec->lrh_index, cat_llh->lgh_id.lgl_oid);
 557
 558         rc = llog_cat_id2handle(env, cat_llh, &llh, &lir->lid_id);
 559         if (rc) {
 560                 CERROR("%s: cannot find handle for llog "LPX64": %d\n",
 561                        cat_llh->lgh_ctxt->loc_obd->obd_name,
 562                        lir->lid_id.lgl_oid, rc);
 563                 RETURN(rc);
 564         }
 565
 566         if (rec->lrh_index < d->lpd_startcat)
 567                 /* Skip processing of the logs until startcat */
 568                 RETURN(0);
 569
 570         if (d->lpd_startidx > 0) {
 571                 struct llog_process_cat_data cd;
 572
 573                 cd.lpcd_first_idx = d->lpd_startidx;
 574                 cd.lpcd_last_idx = 0;
 575                 rc = llog_process_or_fork(env, llh, d->lpd_cb, d->lpd_data,
 576                                           &cd, false);
 577                 /* Continue processing the next log from idx 0 */
 578                 d->lpd_startidx = 0;
 579         } else {
 580                 rc = llog_process_or_fork(env, llh, d->lpd_cb, d->lpd_data,
 581                                           NULL, false);
 582         }
 583         llog_handle_put(llh);
 584
 585         RETURN(rc);
 586 }
 587
 588 int llog_cat_process_or_fork(const struct lu_env *env,
 589                              struct llog_handle *cat_llh,
 590                              llog_cb_t cb, void *data, int startcat,
 591                              int startidx, bool fork)
 592 {
 593         struct llog_process_data d;
 594         struct llog_log_hdr *llh = cat_llh->lgh_hdr;
 595         int rc;
 596         ENTRY;
 597
 598         LASSERT(llh->llh_flags & LLOG_F_IS_CAT);
 599         d.lpd_data = data;
 600         d.lpd_cb = cb;
 601         d.lpd_startcat = startcat;
 602         d.lpd_startidx = startidx;
 603
 604         if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
 605                 struct llog_process_cat_data cd;
 606
 607                 CWARN("catlog "LPX64" crosses index zero\n",
 608                       cat_llh->lgh_id.lgl_oid);
 609
 610                 cd.lpcd_first_idx = llh->llh_cat_idx;
 611                 cd.lpcd_last_idx = 0;
 612                 rc = llog_process_or_fork(env, cat_llh, llog_cat_process_cb,
 613                                           &d, &cd, fork);
 614                 if (rc != 0)
 615                         RETURN(rc);
 616
 617                 cd.lpcd_first_idx = 0;
 618                 cd.lpcd_last_idx = cat_llh->lgh_last_idx;
 619                 rc = llog_process_or_fork(env, cat_llh, llog_cat_process_cb,
 620                                           &d, &cd, fork);
 621         } else {
 622                 rc = llog_process_or_fork(env, cat_llh, llog_cat_process_cb,
 623                                           &d, NULL, fork);
 624         }
 625
 626         RETURN(rc);
 627 }
 628 EXPORT_SYMBOL(llog_cat_process_or_fork);
 629
 630 int llog_cat_process(const struct lu_env *env, struct llog_handle *cat_llh,
 631                      llog_cb_t cb, void *data, int startcat, int startidx)
 632 {
 633         return llog_cat_process_or_fork(env, cat_llh, cb, data, startcat,
 634                                         startidx, false);
 635 }
 636 EXPORT_SYMBOL(llog_cat_process);
 637
 638 static int llog_cat_reverse_process_cb(const struct lu_env *env,
 639                                        struct llog_handle *cat_llh,
 640                                        struct llog_rec_hdr *rec, void *data)
 641 {
 642         struct llog_process_data *d = data;
 643         struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
 644         struct llog_handle *llh;
 645         int rc;
 646
 647         if (le32_to_cpu(rec->lrh_type) != LLOG_LOGID_MAGIC) {
 648                 CERROR("invalid record in catalog\n");
 649                 RETURN(-EINVAL);
 650         }
 651         CDEBUG(D_HA, "processing log "LPX64":%x at index %u of catalog "
 652                LPX64"\n", lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
 653                le32_to_cpu(rec->lrh_index), cat_llh->lgh_id.lgl_oid);
 654
 655         rc = llog_cat_id2handle(env, cat_llh, &llh, &lir->lid_id);
 656         if (rc) {
 657                 CERROR("%s: cannot find handle for llog "LPX64": %d\n",
 658                        cat_llh->lgh_ctxt->loc_obd->obd_name,
 659                        lir->lid_id.lgl_oid, rc);
 660                 RETURN(rc);
 661         }
 662
 663         rc = llog_reverse_process(env, llh, d->lpd_cb, d->lpd_data, NULL);
 664         llog_handle_put(llh);
 665         RETURN(rc);
 666 }
 667
 668 int llog_cat_reverse_process(const struct lu_env *env,
 669                              struct llog_handle *cat_llh,
 670                              llog_cb_t cb, void *data)
 671 {
 672         struct llog_process_data d;
 673         struct llog_process_cat_data cd;
 674         struct llog_log_hdr *llh = cat_llh->lgh_hdr;
 675         int rc;
 676         ENTRY;
 677
 678         LASSERT(llh->llh_flags & LLOG_F_IS_CAT);
 679         d.lpd_data = data;
 680         d.lpd_cb = cb;
 681
 682         if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
 683                 CWARN("catalog "LPX64" crosses index zero\n",
 684                       cat_llh->lgh_id.lgl_oid);
 685
 686                 cd.lpcd_first_idx = 0;
 687                 cd.lpcd_last_idx = cat_llh->lgh_last_idx;
 688                 rc = llog_reverse_process(env, cat_llh,
 689                                           llog_cat_reverse_process_cb,
 690                                           &d, &cd);
 691                 if (rc != 0)
 692                         RETURN(rc);
 693
 694                 cd.lpcd_first_idx = le32_to_cpu(llh->llh_cat_idx);
 695                 cd.lpcd_last_idx = 0;
 696                 rc = llog_reverse_process(env, cat_llh,
 697                                           llog_cat_reverse_process_cb,
 698                                           &d, &cd);
 699         } else {
 700                 rc = llog_reverse_process(env, cat_llh,
 701                                           llog_cat_reverse_process_cb,
 702                                           &d, NULL);
 703         }
 704
 705         RETURN(rc);
 706 }
 707 EXPORT_SYMBOL(llog_cat_reverse_process);
 708
 709 int llog_cat_set_first_idx(struct llog_handle *cathandle, int index)
 710 {
 711         struct llog_log_hdr *llh = cathandle->lgh_hdr;
 712         int i, bitmap_size, idx;
 713         ENTRY;
 714
 715         bitmap_size = LLOG_BITMAP_SIZE(llh);
 716         if (llh->llh_cat_idx == (index - 1)) {
 717                 idx = llh->llh_cat_idx + 1;
 718                 llh->llh_cat_idx = idx;
 719                 if (idx == cathandle->lgh_last_idx)
 720                         goto out;
 721                 for (i = (index + 1) % bitmap_size;
 722                      i != cathandle->lgh_last_idx;
 723                      i = (i + 1) % bitmap_size) {
 724                         if (!ext2_test_bit(i, llh->llh_bitmap)) {
 725                                 idx = llh->llh_cat_idx + 1;
 726                                 llh->llh_cat_idx = idx;
 727                         } else if (i == 0) {
 728                                 llh->llh_cat_idx = 0;
 729                         } else {
 730                                 break;
 731                         }
 732                 }
 733 out:
 734                 CDEBUG(D_RPCTRACE, "set catlog "LPX64" first idx %u\n",
 735                        cathandle->lgh_id.lgl_oid, llh->llh_cat_idx);
 736         }
 737
 738         RETURN(0);
 739 }
 740
 741 /* Cleanup deleted plain llog traces from catalog */
 742 int llog_cat_cleanup(const struct lu_env *env, struct llog_handle *cathandle,
 743                      struct llog_handle *loghandle, int index)
 744 {
 745         int rc;
 746
 747         LASSERT(index);
 748         if (loghandle != NULL) {
 749                 /* remove destroyed llog from catalog list and
 750                  * chd_current_log variable */
 751                 down_write(&cathandle->lgh_lock);
 752                 if (cathandle->u.chd.chd_current_log == loghandle)
 753                         cathandle->u.chd.chd_current_log = NULL;
 754                 cfs_list_del_init(&loghandle->u.phd.phd_entry);
 755                 up_write(&cathandle->lgh_lock);
 756                 LASSERT(index == loghandle->u.phd.phd_cookie.lgc_index);
 757                 /* llog was opened and keep in a list, close it now */
 758                 llog_close(env, loghandle);
 759         }
 760         /* remove plain llog entry from catalog by index */
 761         llog_cat_set_first_idx(cathandle, index);
 762         rc = llog_cancel_rec(env, cathandle, index);
 763         if (rc == 0)
 764                 CDEBUG(D_HA, "cancel plain log at index"
 765                        " %u of catalog "LPX64"\n",
 766                        index, cathandle->lgh_id.lgl_oid);
 767         return rc;
 768 }
 769
 770 int cat_cancel_cb(const struct lu_env *env, struct llog_handle *cathandle,
 771                   struct llog_rec_hdr *rec, void *data)
 772 {
 773         struct llog_logid_rec   *lir = (struct llog_logid_rec *)rec;
 774         struct llog_handle      *loghandle;
 775         struct llog_log_hdr     *llh;
 776         int                      rc;
 777
 778         ENTRY;
 779
 780         if (rec->lrh_type != LLOG_LOGID_MAGIC) {
 781                 CERROR("invalid record in catalog\n");
 782                 RETURN(-EINVAL);
 783         }
 784         CDEBUG(D_HA, "processing log "LPX64":%x at index %u of catalog "
 785                LPX64"\n", lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
 786                rec->lrh_index, cathandle->lgh_id.lgl_oid);
 787
 788         rc = llog_cat_id2handle(env, cathandle, &loghandle, &lir->lid_id);
 789         if (rc) {
 790                 CERROR("%s: cannot find handle for llog "LPX64": %d\n",
 791                        cathandle->lgh_ctxt->loc_obd->obd_name,
 792                        lir->lid_id.lgl_oid, rc);
 793                 if (rc == -ENOENT || rc == -ESTALE) {
 794                         /* remove index from catalog */
 795                         llog_cat_cleanup(env, cathandle, NULL, rec->lrh_index);
 796                 }
 797                 RETURN(rc);
 798         }
 799
 800         llh = loghandle->lgh_hdr;
 801         if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY) &&
 802             (llh->llh_count == 1)) {
 803                 rc = llog_destroy(env, loghandle);
 804                 if (rc)
 805                         CERROR("%s: fail to destroy empty log: rc = %d\n",
 806                                loghandle->lgh_ctxt->loc_obd->obd_name, rc);
 807
 808                 llog_cat_cleanup(env, cathandle, loghandle,
 809                                  loghandle->u.phd.phd_cookie.lgc_index);
 810         }
 811         llog_handle_put(loghandle);
 812
 813         RETURN(rc);
 814 }
 815 EXPORT_SYMBOL(cat_cancel_cb);
 816
 817 /* helper to initialize catalog llog and process it to cancel */
 818 int llog_cat_init_and_process(const struct lu_env *env,
 819                               struct llog_handle *llh)
 820 {
 821         int rc;
 822
 823         rc = llog_init_handle(env, llh, LLOG_F_IS_CAT, NULL);
 824         if (rc)
 825                 RETURN(rc);
 826
 827         rc = llog_process_or_fork(env, llh, cat_cancel_cb, NULL, NULL, false);
 828         if (rc)
 829                 CERROR("%s: llog_process() with cat_cancel_cb failed: rc = "
 830                        "%d\n", llh->lgh_ctxt->loc_obd->obd_name, rc);
 831         RETURN(0);
 832 }
 833 EXPORT_SYMBOL(llog_cat_init_and_process);
 834