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