lustre/lvfs/llog_cat.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   5  *   Author: Andreas Dilger <adilger@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * OST<->MDS recovery logging infrastructure.
  23  *
  24  * Invariants in implementation:
  25  * - we do not share logs among different OST<->MDS connections, so that
  26  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  27  */
  28
  29 #define DEBUG_SUBSYSTEM S_LOG
  30
  31 #ifndef EXPORT_SYMTAB
  32 #define EXPORT_SYMTAB
  33 #endif
  34
  35 #ifdef __KERNEL__
  36 #include <linux/fs.h>
  37 #else
  38 #include <liblustre.h>
  39 #endif
  40
  41 #include <linux/lustre_log.h>
  42 #include <portals/list.h>
  43
  44 /* Create a new log handle and add it to the open list.
  45  * This log handle will be closed when all of the records in it are removed.
  46  *
  47  * Assumes caller has already pushed us into the kernel context and is locking.
  48  */
  49 static struct llog_handle *llog_cat_new_log(struct llog_handle *cathandle)
  50 {
  51         struct llog_handle *loghandle;
  52         struct llog_log_hdr *llh;
  53         struct llog_logid_rec rec;
  54         int rc, index, bitmap_size;
  55         ENTRY;
  56
  57         llh = cathandle->lgh_hdr;
  58         bitmap_size = sizeof(llh->llh_bitmap) * 8;
  59
  60         index = (cathandle->lgh_last_idx + 1) % bitmap_size;
  61
  62         /* maximum number of available slots in catalog is bitmap_size - 2 */
  63         if (llh->llh_cat_idx == cpu_to_le32(index)) {
  64                 CERROR("no free catalog slots for log...\n");
  65                 RETURN(ERR_PTR(-ENOSPC));
  66         } else {
  67                 if (index == 0)
  68                         index = 1;
  69                 if (ext2_set_bit(index, llh->llh_bitmap)) {
  70                         CERROR("argh, index %u already set in log bitmap?\n",
  71                                index);
  72                         LBUG(); /* should never happen */
  73                 }
  74                 cathandle->lgh_last_idx = index;
  75                 llh->llh_count = cpu_to_le32(le32_to_cpu(llh->llh_count) + 1);
  76                 llh->llh_tail.lrt_index = cpu_to_le32(index);
  77         }
  78
  79         rc = llog_create(cathandle->lgh_ctxt, &loghandle, NULL, NULL);
  80         if (rc) {
  81                 CERROR("cannot create new log, error = %d\n", rc);
  82                 RETURN(ERR_PTR(rc));
  83         }
  84
  85         rc = llog_init_handle(loghandle,
  86                               LLOG_F_IS_PLAIN | LLOG_F_ZAP_WHEN_EMPTY,
  87                               &cathandle->lgh_hdr->llh_tgtuuid);
  88         if (rc)
  89                 GOTO(out_destroy, rc);
  90
  91         CDEBUG(D_HA, "new recovery log "LPX64":%x for index %u of catalog "
  92                LPX64"\n", loghandle->lgh_id.lgl_oid, loghandle->lgh_id.lgl_ogen,
  93                index, cathandle->lgh_id.lgl_oid);
  94         /* build the record for this log in the catalog */
  95         rec.lid_hdr.lrh_len = cpu_to_le32(sizeof(rec));
  96         rec.lid_hdr.lrh_index = cpu_to_le32(index);
  97         rec.lid_hdr.lrh_type = cpu_to_le32(LLOG_LOGID_MAGIC);
  98         rec.lid_id = loghandle->lgh_id;
  99         rec.lid_tail.lrt_len = cpu_to_le32(sizeof(rec));
 100         rec.lid_tail.lrt_index = cpu_to_le32(index);
 101
 102         /* update the catalog: header and record */
 103         rc = llog_write_rec(cathandle, &rec.lid_hdr,
 104                             &loghandle->u.phd.phd_cookie, 1, NULL, index);
 105         if (rc < 0)
 106                 GOTO(out_destroy, rc);
 107
 108         loghandle->lgh_hdr->llh_cat_idx = cpu_to_le32(index);
 109         cathandle->u.chd.chd_current_log = loghandle;
 110         LASSERT(list_empty(&loghandle->u.phd.phd_entry));
 111         list_add_tail(&loghandle->u.phd.phd_entry, &cathandle->u.chd.chd_head);
 112
 113  out_destroy:
 114         if (rc < 0)
 115                 llog_destroy(loghandle);
 116
 117         RETURN(loghandle);
 118 }
 119
 120 /* Open an existent log handle and add it to the open list.
 121  * This log handle will be closed when all of the records in it are removed.
 122  *
 123  * Assumes caller has already pushed us into the kernel context and is locking.
 124  * We return a lock on the handle to ensure nobody yanks it from us.
 125  */
 126 int llog_cat_id2handle(struct llog_handle *cathandle, struct llog_handle **res,
 127                               struct llog_logid *logid)
 128 {
 129         struct llog_handle *loghandle;
 130         int rc = 0;
 131         ENTRY;
 132
 133         if (cathandle == NULL)
 134                 RETURN(-EBADF);
 135
 136         list_for_each_entry(loghandle, &cathandle->u.chd.chd_head,
 137                             u.phd.phd_entry) {
 138                 struct llog_logid *cgl = &loghandle->lgh_id;
 139                 if (cgl->lgl_oid == logid->lgl_oid) {
 140                         if (cgl->lgl_ogen != logid->lgl_ogen) {
 141                                 CERROR("log "LPX64" generation %x != %x\n",
 142                                        logid->lgl_oid, cgl->lgl_ogen,
 143                                        logid->lgl_ogen);
 144                                 continue;
 145                         }
 146                         loghandle->u.phd.phd_cat_handle = cathandle;
 147                         GOTO(out, rc = 0);
 148                 }
 149         }
 150
 151         rc = llog_create(cathandle->lgh_ctxt, &loghandle, logid, NULL);
 152         if (rc) {
 153                 CERROR("error opening log id "LPX64":%x: rc %d\n",
 154                        logid->lgl_oid, logid->lgl_ogen, rc);
 155         } else {
 156                 rc = llog_init_handle(loghandle, LLOG_F_IS_PLAIN, NULL);
 157                 if (!rc) {
 158                         list_add(&loghandle->u.phd.phd_entry,
 159                                  &cathandle->u.chd.chd_head);
 160                 }
 161         }
 162         if (!rc) {
 163                 loghandle->u.phd.phd_cat_handle = cathandle;
 164                 loghandle->u.phd.phd_cookie.lgc_lgl = cathandle->lgh_id;
 165                 loghandle->u.phd.phd_cookie.lgc_index =
 166                         le32_to_cpu(loghandle->lgh_hdr->llh_cat_idx);
 167         }
 168
 169 out:
 170         *res = loghandle;
 171         RETURN(rc);
 172 }
 173 EXPORT_SYMBOL(llog_cat_id2handle);
 174
 175 int llog_cat_put(struct llog_handle *cathandle)
 176 {
 177         struct llog_handle *loghandle, *n;
 178         int rc;
 179         ENTRY;
 180
 181         list_for_each_entry_safe(loghandle, n, &cathandle->u.chd.chd_head,
 182                                  u.phd.phd_entry) {
 183                 int err = llog_close(loghandle);
 184                 if (err)
 185                         CERROR("error closing loghandle\n");
 186         }
 187         rc = llog_close(cathandle);
 188         RETURN(rc);
 189 }
 190 EXPORT_SYMBOL(llog_cat_put);
 191
 192 /* Return the currently active log handle.  If the current log handle doesn't
 193  * have enough space left for the current record, start a new one.
 194  *
 195  * If reclen is 0, we only want to know what the currently active log is,
 196  * otherwise we get a lock on this log so nobody can steal our space.
 197  *
 198  * Assumes caller has already pushed us into the kernel context and is locking.
 199  *
 200  * NOTE: loghandle is write-locked upon successful return
 201  */
 202 static struct llog_handle *llog_cat_current_log(struct llog_handle *cathandle,
 203                                                 int create)
 204 {
 205         struct llog_handle *loghandle = NULL;
 206         ENTRY;
 207
 208         down_read(&cathandle->lgh_lock);
 209         loghandle = cathandle->u.chd.chd_current_log;
 210         if (loghandle) {
 211                 struct llog_log_hdr *llh = loghandle->lgh_hdr;
 212                 if (loghandle->lgh_last_idx < (sizeof(llh->llh_bitmap)*8) - 1) {
 213                         down_write(&loghandle->lgh_lock);
 214                         up_read(&cathandle->lgh_lock);
 215                         RETURN(loghandle);
 216                 }
 217         }
 218         if (!create) {
 219                 if (loghandle)
 220                         down_write(&loghandle->lgh_lock);
 221                 up_read(&cathandle->lgh_lock);
 222                 RETURN(loghandle);
 223         }
 224         up_read(&cathandle->lgh_lock);
 225
 226         /* time to create new log */
 227
 228         /* first, we have to make sure the state hasn't changed */
 229         down_write(&cathandle->lgh_lock);
 230         loghandle = cathandle->u.chd.chd_current_log;
 231         if (loghandle) {
 232                 struct llog_log_hdr *llh = loghandle->lgh_hdr;
 233                 if (loghandle->lgh_last_idx < (sizeof(llh->llh_bitmap)*8) - 1) {
 234                         down_write(&loghandle->lgh_lock);
 235                         up_write(&cathandle->lgh_lock);
 236                         RETURN(loghandle);
 237                 }
 238         }
 239
 240         CDEBUG(D_INODE, "creating new log\n");
 241         loghandle = llog_cat_new_log(cathandle);
 242         if (!IS_ERR(loghandle))
 243                 down_write(&loghandle->lgh_lock);
 244         up_write(&cathandle->lgh_lock);
 245         RETURN(loghandle);
 246 }
 247
 248 /* Add a single record to the recovery log(s) using a catalog
 249  * Returns as llog_write_record
 250  *
 251  * Assumes caller has already pushed us into the kernel context.
 252  */
 253 int llog_cat_add_rec(struct llog_handle *cathandle, struct llog_rec_hdr *rec,
 254                      struct llog_cookie *reccookie, void *buf)
 255 {
 256         struct llog_handle *loghandle;
 257         int rc;
 258         ENTRY;
 259
 260         LASSERT(le32_to_cpu(rec->lrh_len) <= LLOG_CHUNK_SIZE);
 261         loghandle = llog_cat_current_log(cathandle, 1);
 262         if (IS_ERR(loghandle))
 263                 RETURN(PTR_ERR(loghandle));
 264         /* loghandle is already locked by llog_cat_current_log() for us */
 265         rc = llog_write_rec(loghandle, rec, reccookie, 1, buf, -1);
 266         up_write(&loghandle->lgh_lock);
 267
 268         RETURN(rc);
 269 }
 270 EXPORT_SYMBOL(llog_cat_add_rec);
 271
 272 /* For each cookie in the cookie array, we clear the log in-use bit and either:
 273  * - the log is empty, so mark it free in the catalog header and delete it
 274  * - the log is not empty, just write out the log header
 275  *
 276  * The cookies may be in different log files, so we need to get new logs
 277  * each time.
 278  *
 279  * Assumes caller has already pushed us into the kernel context.
 280  */
 281 int llog_cat_cancel_records(struct llog_handle *cathandle, int count,
 282                             struct llog_cookie *cookies)
 283 {
 284         int i, index, rc = 0;
 285         ENTRY;
 286
 287         down_write(&cathandle->lgh_lock);
 288         for (i = 0; i < count; i++, cookies++) {
 289                 struct llog_handle *loghandle;
 290                 struct llog_logid *lgl = &cookies->lgc_lgl;
 291
 292                 rc = llog_cat_id2handle(cathandle, &loghandle, lgl);
 293                 if (rc) {
 294                         CERROR("Cannot find log "LPX64"\n", lgl->lgl_oid);
 295                         break;
 296                 }
 297
 298                 down_write(&loghandle->lgh_lock);
 299                 rc = llog_cancel_rec(loghandle, cookies->lgc_index);
 300                 up_write(&loghandle->lgh_lock);
 301
 302                 if (rc == 1) {          /* log has been destroyed */
 303                         index = loghandle->u.phd.phd_cookie.lgc_index;
 304                         if (cathandle->u.chd.chd_current_log == loghandle)
 305                                 cathandle->u.chd.chd_current_log = NULL;
 306                         llog_free_handle(loghandle);
 307
 308                         LASSERT(index);
 309                         llog_cat_set_first_idx(cathandle, index);
 310                         rc = llog_cancel_rec(cathandle, index);
 311                         if (rc == 0)
 312                                 CDEBUG(D_HA, "cancel plain log at index %u "
 313                                        "of catalog "LPX64"\n",
 314                                        index, cathandle->lgh_id.lgl_oid);
 315                 }
 316         }
 317         up_write(&cathandle->lgh_lock);
 318
 319         RETURN(rc);
 320 }
 321 EXPORT_SYMBOL(llog_cat_cancel_records);
 322
 323 static int llog_cat_process_cb(struct llog_handle *cat_llh,
 324                                struct llog_rec_hdr *rec, void *data)
 325 {
 326         struct llog_process_data *d = data;
 327         struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
 328         struct llog_handle *llh;
 329         int rc;
 330
 331         if (le32_to_cpu(rec->lrh_type) != LLOG_LOGID_MAGIC) {
 332                 CERROR("invalid record in catalog\n");
 333                 RETURN(-EINVAL);
 334         }
 335         CWARN("processing log "LPX64":%x at index %u of catalog "LPX64"\n",
 336                lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
 337                le32_to_cpu(rec->lrh_index), cat_llh->lgh_id.lgl_oid);
 338
 339         rc = llog_cat_id2handle(cat_llh, &llh, &lir->lid_id);
 340         if (rc) {
 341                 CERROR("Cannot find handle for log "LPX64"\n",
 342                        lir->lid_id.lgl_oid);
 343                 RETURN(rc);
 344         }
 345
 346         rc = llog_process(llh, d->lpd_cb, d->lpd_data, NULL);
 347         RETURN(rc);
 348 }
 349
 350 int llog_cat_process(struct llog_handle *cat_llh, llog_cb_t cb, void *data)
 351 {
 352         struct llog_process_data d;
 353         struct llog_process_cat_data cd;
 354         struct llog_log_hdr *llh = cat_llh->lgh_hdr;
 355         int rc;
 356         ENTRY;
 357
 358         LASSERT(llh->llh_flags &cpu_to_le32(LLOG_F_IS_CAT));
 359         d.lpd_data = data;
 360         d.lpd_cb = cb;
 361
 362         if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
 363                 CWARN("catalog "LPX64" crosses index zero\n",
 364                       cat_llh->lgh_id.lgl_oid);
 365
 366                 cd.first_idx = le32_to_cpu(llh->llh_cat_idx);
 367                 cd.last_idx = 0;
 368                 rc = llog_process(cat_llh, llog_cat_process_cb, &d, &cd);
 369                 if (rc != 0)
 370                         RETURN(rc);
 371
 372                 cd.first_idx = 0;
 373                 cd.last_idx = cat_llh->lgh_last_idx;
 374                 rc = llog_process(cat_llh, llog_cat_process_cb, &d, &cd);
 375         } else {
 376                 rc = llog_process(cat_llh, llog_cat_process_cb, &d, NULL);
 377         }
 378
 379         RETURN(rc);
 380 }
 381 EXPORT_SYMBOL(llog_cat_process);
 382
 383 static int llog_cat_reverse_process_cb(struct llog_handle *cat_llh,
 384                                        struct llog_rec_hdr *rec, void *data)
 385 {
 386         struct llog_process_data *d = data;
 387         struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
 388         struct llog_handle *llh;
 389         int rc;
 390
 391         if (le32_to_cpu(rec->lrh_type) != LLOG_LOGID_MAGIC) {
 392                 CERROR("invalid record in catalog\n");
 393                 RETURN(-EINVAL);
 394         }
 395         CWARN("processing log "LPX64":%x at index %u of catalog "LPX64"\n",
 396                lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
 397                le32_to_cpu(rec->lrh_index), cat_llh->lgh_id.lgl_oid);
 398
 399         rc = llog_cat_id2handle(cat_llh, &llh, &lir->lid_id);
 400         if (rc) {
 401                 CERROR("Cannot find handle for log "LPX64"\n",
 402                        lir->lid_id.lgl_oid);
 403                 RETURN(rc);
 404         }
 405
 406         rc = llog_reverse_process(llh, d->lpd_cb, d->lpd_data, NULL);
 407         RETURN(rc);
 408 }
 409
 410 int llog_cat_reverse_process(struct llog_handle *cat_llh,
 411                              llog_cb_t cb, void *data)
 412 {
 413         struct llog_process_data d;
 414         struct llog_process_cat_data cd;
 415         struct llog_log_hdr *llh = cat_llh->lgh_hdr;
 416         int rc;
 417         ENTRY;
 418
 419         LASSERT(llh->llh_flags &cpu_to_le32(LLOG_F_IS_CAT));
 420         d.lpd_data = data;
 421         d.lpd_cb = cb;
 422
 423         if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
 424                 CWARN("catalog "LPX64" crosses index zero\n",
 425                       cat_llh->lgh_id.lgl_oid);
 426
 427                 cd.first_idx = 0;
 428                 cd.last_idx = cat_llh->lgh_last_idx;
 429                 rc = llog_reverse_process(cat_llh, llog_cat_reverse_process_cb,
 430                                           &d, &cd);
 431                 if (rc != 0)
 432                         RETURN(rc);
 433
 434                 cd.first_idx = le32_to_cpu(llh->llh_cat_idx);
 435                 cd.last_idx = 0;
 436                 rc = llog_reverse_process(cat_llh, llog_cat_reverse_process_cb,
 437                                           &d, &cd);
 438         } else {
 439                 rc = llog_reverse_process(cat_llh, llog_cat_reverse_process_cb,
 440                                           &d, NULL);
 441         }
 442
 443         RETURN(rc);
 444 }
 445 EXPORT_SYMBOL(llog_cat_reverse_process);
 446
 447 int llog_cat_set_first_idx(struct llog_handle *cathandle, int index)
 448 {
 449         struct llog_log_hdr *llh = cathandle->lgh_hdr;
 450         int i, bitmap_size, idx;
 451         ENTRY;
 452
 453         bitmap_size = sizeof(llh->llh_bitmap) * 8;
 454         if (llh->llh_cat_idx == cpu_to_le32(index - 1)) {
 455                 idx = le32_to_cpu(llh->llh_cat_idx) + 1;
 456                 llh->llh_cat_idx = cpu_to_le32(idx);
 457                 if (idx == cathandle->lgh_last_idx)
 458                         goto out;
 459                 for (i = (index + 1) % bitmap_size;
 460                      i != cathandle->lgh_last_idx;
 461                      i = (i + 1) % bitmap_size) {
 462                         if (!ext2_test_bit(i, llh->llh_bitmap)) {
 463                                 idx = le32_to_cpu(llh->llh_cat_idx) + 1;
 464                                 llh->llh_cat_idx = cpu_to_le32(idx);
 465                         } else if (i == 0) {
 466                                 llh->llh_cat_idx = 0;
 467                         } else {
 468                                 break;
 469                         }
 470                 }
 471 out:
 472                 CDEBUG(D_HA, "set catalog "LPX64" first idx %u\n",
 473                        cathandle->lgh_id.lgl_oid,le32_to_cpu(llh->llh_cat_idx));
 474         }
 475
 476         RETURN(0);
 477 }
 478 EXPORT_SYMBOL(llog_cat_set_first_idx);
 479
 480 int llog_catalog_add(struct llog_ctxt *ctxt, struct llog_rec_hdr *rec,
 481                      void *buf, struct llog_cookie *logcookies,
 482                      int numcookies, void *data)
 483 {
 484         struct llog_handle *cathandle;
 485         int rc;
 486         ENTRY;
 487
 488         cathandle = ctxt->loc_handle;
 489         LASSERT(cathandle != NULL);
 490
 491         rc = llog_cat_add_rec(cathandle, rec, logcookies, buf);
 492         if (rc != 1)
 493                 CERROR("write one catalog record failed: %d\n", rc);
 494         RETURN(rc);
 495 }
 496 EXPORT_SYMBOL(llog_catalog_add);
 497
 498 int llog_catalog_cancel(struct llog_ctxt *ctxt, int count,
 499                         struct llog_cookie *cookies, int flags, void *data)
 500 {
 501         struct llog_handle *cathandle;
 502         int rc;
 503         ENTRY;
 504
 505         if (cookies == NULL || count == 0)
 506                 RETURN(-EINVAL);
 507         cathandle = ctxt->loc_handle;
 508         LASSERT(cathandle != NULL);
 509         rc = llog_cat_cancel_records(cathandle, count, cookies);
 510         RETURN(rc);
 511 }
 512 EXPORT_SYMBOL(llog_catalog_cancel);
 513
 514 int llog_catalog_setup(struct llog_ctxt **res, char *name,
 515                        struct obd_export *exp,
 516                        struct lvfs_run_ctxt *lvfs_ctxt,
 517                        struct fsfilt_operations *fsops,
 518                        struct dentry *logs_de,
 519                        struct dentry *objects_de)
 520 {
 521         struct llog_ctxt *ctxt;
 522         struct llog_catid catid;
 523         struct llog_handle *handle;
 524         int rc;
 525
 526         ENTRY;
 527
 528         OBD_ALLOC(ctxt, sizeof(*ctxt));
 529         if (!ctxt)
 530                 RETURN(-ENOMEM);
 531
 532         *res = ctxt;
 533
 534         /* marking this ctxt alone. */
 535         ctxt->loc_alone = 1;
 536         ctxt->loc_fsops = fsops;
 537         ctxt->loc_lvfs_ctxt = lvfs_ctxt;
 538         ctxt->loc_exp = exp;
 539         ctxt->loc_logs_dir = logs_de;
 540         ctxt->loc_objects_dir = objects_de;
 541         ctxt->loc_logops = &llog_lvfs_ops;
 542         ctxt->loc_logops->lop_add = llog_catalog_add;
 543         ctxt->loc_logops->lop_cancel = llog_catalog_cancel;
 544
 545         memset(&catid, 0, sizeof(struct llog_catid));
 546         rc = llog_get_cat_list(lvfs_ctxt, fsops, name, 1, &catid);
 547         if (rc) {
 548                 CERROR("error llog_get_cat_list rc: %d\n", rc);
 549                 RETURN(rc);
 550         }
 551         if (catid.lci_logid.lgl_oid)
 552                 rc = llog_create(ctxt, &handle, &catid.lci_logid, 0);
 553         else {
 554                 rc = llog_create(ctxt, &handle, NULL, NULL);
 555                 if (!rc)
 556                         catid.lci_logid = handle->lgh_id;
 557         }
 558         if (rc)
 559                 GOTO(out, rc);
 560
 561         ctxt->loc_handle = handle;
 562         rc = llog_init_handle(handle, LLOG_F_IS_CAT, NULL);
 563         if (rc)
 564                 GOTO(out, rc);
 565
 566         rc = llog_put_cat_list(lvfs_ctxt, fsops, name, 1, &catid);
 567         if (rc)
 568                 CERROR("error llog_get_cat_list rc: %d\n", rc);
 569 out:
 570         if (ctxt && rc)
 571                 OBD_FREE(ctxt, sizeof(*ctxt));
 572         RETURN(rc);
 573 }
 574 EXPORT_SYMBOL(llog_catalog_setup);
 575
 576 int llog_catalog_cleanup(struct llog_ctxt *ctxt)
 577 {
 578         struct llog_handle *cathandle, *n, *loghandle;
 579         struct llog_log_hdr *llh;
 580         int rc, index;
 581         ENTRY;
 582
 583         if (!ctxt)
 584                 return 0;
 585
 586         cathandle = ctxt->loc_handle;
 587         if (cathandle) {
 588                 list_for_each_entry_safe(loghandle, n,
 589                                          &cathandle->u.chd.chd_head,
 590                                          u.phd.phd_entry) {
 591                         llh = loghandle->lgh_hdr;
 592                         if ((le32_to_cpu(llh->llh_flags) &
 593                                 LLOG_F_ZAP_WHEN_EMPTY) &&
 594                             (le32_to_cpu(llh->llh_count) == 1)) {
 595                                 rc = llog_destroy(loghandle);
 596                                 if (rc)
 597                                         CERROR("failure destroying log during "
 598                                                "cleanup: %d\n", rc);
 599                                 LASSERT(rc == 0);
 600                                 index = loghandle->u.phd.phd_cookie.lgc_index;
 601                                 llog_free_handle(loghandle);
 602
 603                                 LASSERT(index);
 604                                 llog_cat_set_first_idx(cathandle, index);
 605                                 rc = llog_cancel_rec(cathandle, index);
 606                                 if (rc == 0)
 607                                         CDEBUG(D_HA, "cancel plain log at index"
 608                                                " %u of catalog "LPX64"\n",
 609                                                index,cathandle->lgh_id.lgl_oid);
 610                         }
 611                 }
 612                 llog_cat_put(ctxt->loc_handle);
 613         }
 614         return 0;
 615 }
 616 EXPORT_SYMBOL(llog_catalog_cleanup);
 617
 618 int llog_cat_half_bottom(struct llog_cookie *cookie, struct llog_handle *handle)
 619 {
 620         struct llog_handle *loghandle;
 621         struct llog_logid *lgl = &cookie->lgc_lgl;
 622         int rc;
 623
 624         down_read(&handle->lgh_lock);
 625         rc = llog_cat_id2handle(handle, &loghandle, lgl);
 626         if (rc)
 627                 GOTO(out, rc);
 628         if (2 * loghandle->lgh_hdr->llh_cat_idx <=
 629             handle->lgh_last_idx + handle->lgh_hdr->llh_cat_idx + 1)
 630                 rc = 1;
 631         else
 632                 rc = 0;
 633 out:
 634         up_read(&handle->lgh_lock);
 635         RETURN(rc);
 636 }
 637 EXPORT_SYMBOL(llog_cat_half_bottom);