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