lustre/obdclass/llog.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, 2015, 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.c
  37  *
  38  * OST<->MDS recovery logging infrastructure.
  39  * Invariants in implementation:
  40  * - we do not share logs among different OST<->MDS connections, so that
  41  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  42  *
  43  * Author: Andreas Dilger <adilger@clusterfs.com>
  44  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
  45  * Author: Mikhail Pershin <tappro@whamcloud.com>
  46  */
  47
  48 #define DEBUG_SUBSYSTEM S_LOG
  49
  50 #include <linux/kthread.h>
  51 #include <llog_swab.h>
  52 #include <lustre_log.h>
  53 #include <obd_class.h>
  54 #include "llog_internal.h"
  55 /*
  56  * Allocate a new log or catalog handle
  57  * Used inside llog_open().
  58  */
  59 static struct llog_handle *llog_alloc_handle(void)
  60 {
  61         struct llog_handle *loghandle;
  62
  63         OBD_ALLOC_PTR(loghandle);
  64         if (loghandle == NULL)
  65                 return NULL;
  66
  67         init_rwsem(&loghandle->lgh_lock);
  68         mutex_init(&loghandle->lgh_hdr_mutex);
  69         INIT_LIST_HEAD(&loghandle->u.phd.phd_entry);
  70         atomic_set(&loghandle->lgh_refcount, 1);
  71
  72         return loghandle;
  73 }
  74
  75 /*
  76  * Free llog handle and header data if exists. Used in llog_close() only
  77  */
  78 static void llog_free_handle(struct llog_handle *loghandle)
  79 {
  80         LASSERT(loghandle != NULL);
  81
  82         /* failed llog_init_handle */
  83         if (loghandle->lgh_hdr == NULL)
  84                 goto out;
  85
  86         if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN)
  87                 LASSERT(list_empty(&loghandle->u.phd.phd_entry));
  88         else if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT)
  89                 LASSERT(list_empty(&loghandle->u.chd.chd_head));
  90         OBD_FREE_LARGE(loghandle->lgh_hdr, loghandle->lgh_hdr_size);
  91 out:
  92         OBD_FREE_PTR(loghandle);
  93 }
  94
  95 void llog_handle_get(struct llog_handle *loghandle)
  96 {
  97         atomic_inc(&loghandle->lgh_refcount);
  98 }
  99
 100 void llog_handle_put(struct llog_handle *loghandle)
 101 {
 102         LASSERT(atomic_read(&loghandle->lgh_refcount) > 0);
 103         if (atomic_dec_and_test(&loghandle->lgh_refcount))
 104                 llog_free_handle(loghandle);
 105 }
 106
 107 static int llog_declare_destroy(const struct lu_env *env,
 108                                 struct llog_handle *handle,
 109                                 struct thandle *th)
 110 {
 111         struct llog_operations *lop;
 112         int rc;
 113
 114         ENTRY;
 115
 116         rc = llog_handle2ops(handle, &lop);
 117         if (rc)
 118                 RETURN(rc);
 119         if (lop->lop_declare_destroy == NULL)
 120                 RETURN(-EOPNOTSUPP);
 121
 122         rc = lop->lop_declare_destroy(env, handle, th);
 123
 124         RETURN(rc);
 125 }
 126
 127 int llog_trans_destroy(const struct lu_env *env, struct llog_handle *handle,
 128                        struct thandle *th)
 129 {
 130         struct llog_operations  *lop;
 131         int rc;
 132         ENTRY;
 133
 134         rc = llog_handle2ops(handle, &lop);
 135         if (rc < 0)
 136                 RETURN(rc);
 137         if (lop->lop_destroy == NULL)
 138                 RETURN(-EOPNOTSUPP);
 139
 140         LASSERT(handle->lgh_obj != NULL);
 141         if (!dt_object_exists(handle->lgh_obj))
 142                 RETURN(0);
 143
 144         rc = lop->lop_destroy(env, handle, th);
 145
 146         RETURN(rc);
 147 }
 148
 149 int llog_destroy(const struct lu_env *env, struct llog_handle *handle)
 150 {
 151         struct llog_operations  *lop;
 152         struct dt_device        *dt;
 153         struct thandle          *th;
 154         int rc;
 155
 156         ENTRY;
 157
 158         rc = llog_handle2ops(handle, &lop);
 159         if (rc < 0)
 160                 RETURN(rc);
 161         if (lop->lop_destroy == NULL)
 162                 RETURN(-EOPNOTSUPP);
 163
 164         if (handle->lgh_obj == NULL) {
 165                 /* if lgh_obj == NULL, then it is from client side destroy */
 166                 rc = lop->lop_destroy(env, handle, NULL);
 167                 RETURN(rc);
 168         }
 169
 170         if (!dt_object_exists(handle->lgh_obj))
 171                 RETURN(0);
 172
 173         dt = lu2dt_dev(handle->lgh_obj->do_lu.lo_dev);
 174
 175         th = dt_trans_create(env, dt);
 176         if (IS_ERR(th))
 177                 RETURN(PTR_ERR(th));
 178
 179         rc = llog_declare_destroy(env, handle, th);
 180         if (rc != 0)
 181                 GOTO(out_trans, rc);
 182
 183         rc = dt_trans_start_local(env, dt, th);
 184         if (rc < 0)
 185                 GOTO(out_trans, rc);
 186
 187         rc = lop->lop_destroy(env, handle, th);
 188
 189 out_trans:
 190         dt_trans_stop(env, dt, th);
 191
 192         RETURN(rc);
 193 }
 194 EXPORT_SYMBOL(llog_destroy);
 195
 196 /* returns negative on error; 0 if success; 1 if success & log destroyed */
 197 int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle,
 198                     int index)
 199 {
 200         struct llog_thread_info *lgi = llog_info(env);
 201         struct dt_device        *dt;
 202         struct llog_log_hdr     *llh = loghandle->lgh_hdr;
 203         struct thandle          *th;
 204         int                      rc;
 205         int rc1;
 206         bool subtract_count = false;
 207
 208         ENTRY;
 209
 210         CDEBUG(D_RPCTRACE, "Canceling %d in log "DOSTID"\n", index,
 211                POSTID(&loghandle->lgh_id.lgl_oi));
 212
 213         if (index == 0) {
 214                 CERROR("Can't cancel index 0 which is header\n");
 215                 RETURN(-EINVAL);
 216         }
 217
 218         LASSERT(loghandle != NULL);
 219         LASSERT(loghandle->lgh_ctxt != NULL);
 220         LASSERT(loghandle->lgh_obj != NULL);
 221
 222         dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev);
 223
 224         th = dt_trans_create(env, dt);
 225         if (IS_ERR(th))
 226                 RETURN(PTR_ERR(th));
 227
 228         rc = llog_declare_write_rec(env, loghandle, &llh->llh_hdr, index, th);
 229         if (rc < 0)
 230                 GOTO(out_trans, rc);
 231
 232         if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY))
 233                 rc = llog_declare_destroy(env, loghandle, th);
 234
 235         th->th_wait_submit = 1;
 236         rc = dt_trans_start_local(env, dt, th);
 237         if (rc < 0)
 238                 GOTO(out_trans, rc);
 239
 240         down_write(&loghandle->lgh_lock);
 241         /* clear bitmap */
 242         mutex_lock(&loghandle->lgh_hdr_mutex);
 243         if (!ext2_clear_bit(index, LLOG_HDR_BITMAP(llh))) {
 244                 CDEBUG(D_RPCTRACE, "Catalog index %u already clear?\n", index);
 245                 GOTO(out_unlock, rc);
 246         }
 247
 248         loghandle->lgh_hdr->llh_count--;
 249         subtract_count = true;
 250         /* Pass this index to llog_osd_write_rec(), which will use the index
 251          * to only update the necesary bitmap. */
 252         lgi->lgi_cookie.lgc_index = index;
 253         /* update header */
 254         rc = llog_write_rec(env, loghandle, &llh->llh_hdr, &lgi->lgi_cookie,
 255                             LLOG_HEADER_IDX, th);
 256         if (rc != 0)
 257                 GOTO(out_unlock, rc);
 258
 259         if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY) &&
 260             (llh->llh_count == 1) &&
 261             (loghandle->lgh_last_idx == LLOG_HDR_BITMAP_SIZE(llh) - 1)) {
 262                 rc = llog_trans_destroy(env, loghandle, th);
 263                 if (rc < 0) {
 264                         /* Sigh, can not destroy the final plain llog, but
 265                          * the bitmap has been clearly, so the record can not
 266                          * be accessed anymore, let's return 0 for now, and
 267                          * the orphan will be handled by LFSCK. */
 268                         CERROR("%s: can't destroy empty llog #"DOSTID
 269                                "#%08x: rc = %d\n",
 270                                loghandle->lgh_ctxt->loc_obd->obd_name,
 271                                POSTID(&loghandle->lgh_id.lgl_oi),
 272                                loghandle->lgh_id.lgl_ogen, rc);
 273                         GOTO(out_unlock, rc);
 274                 }
 275                 rc = LLOG_DEL_PLAIN;
 276         }
 277
 278 out_unlock:
 279         mutex_unlock(&loghandle->lgh_hdr_mutex);
 280         up_write(&loghandle->lgh_lock);
 281 out_trans:
 282         rc1 = dt_trans_stop(env, dt, th);
 283         if (rc == 0)
 284                 rc = rc1;
 285         if (rc < 0 && subtract_count) {
 286                 mutex_lock(&loghandle->lgh_hdr_mutex);
 287                 loghandle->lgh_hdr->llh_count++;
 288                 ext2_set_bit(index, LLOG_HDR_BITMAP(llh));
 289                 mutex_unlock(&loghandle->lgh_hdr_mutex);
 290         }
 291         RETURN(rc);
 292 }
 293
 294 int llog_read_header(const struct lu_env *env, struct llog_handle *handle,
 295                      const struct obd_uuid *uuid)
 296 {
 297         struct llog_operations *lop;
 298         int rc;
 299         ENTRY;
 300
 301         rc = llog_handle2ops(handle, &lop);
 302         if (rc)
 303                 RETURN(rc);
 304
 305         if (lop->lop_read_header == NULL)
 306                 RETURN(-EOPNOTSUPP);
 307
 308         rc = lop->lop_read_header(env, handle);
 309         if (rc == LLOG_EEMPTY) {
 310                 struct llog_log_hdr *llh = handle->lgh_hdr;
 311
 312                 /* lrh_len should be initialized in llog_init_handle */
 313                 handle->lgh_last_idx = 0; /* header is record with index 0 */
 314                 handle->lgh_write_offset = 0;
 315                 llh->llh_count = 1;         /* for the header record */
 316                 llh->llh_hdr.lrh_type = LLOG_HDR_MAGIC;
 317                 LASSERT(handle->lgh_ctxt->loc_chunk_size >=
 318                                                 LLOG_MIN_CHUNK_SIZE);
 319                 llh->llh_hdr.lrh_len = handle->lgh_ctxt->loc_chunk_size;
 320                 llh->llh_hdr.lrh_index = 0;
 321                 llh->llh_timestamp = cfs_time_current_sec();
 322                 if (uuid)
 323                         memcpy(&llh->llh_tgtuuid, uuid,
 324                                sizeof(llh->llh_tgtuuid));
 325                 llh->llh_bitmap_offset = offsetof(typeof(*llh), llh_bitmap);
 326                 /* Since update llog header might also call this function,
 327                  * let's reset the bitmap to 0 here */
 328                 memset(LLOG_HDR_BITMAP(llh), 0, llh->llh_hdr.lrh_len -
 329                                                 llh->llh_bitmap_offset -
 330                                                 sizeof(llh->llh_tail));
 331                 ext2_set_bit(0, LLOG_HDR_BITMAP(llh));
 332                 LLOG_HDR_TAIL(llh)->lrt_len = llh->llh_hdr.lrh_len;
 333                 LLOG_HDR_TAIL(llh)->lrt_index = llh->llh_hdr.lrh_index;
 334                 rc = 0;
 335         }
 336         RETURN(rc);
 337 }
 338 EXPORT_SYMBOL(llog_read_header);
 339
 340 int llog_init_handle(const struct lu_env *env, struct llog_handle *handle,
 341                      int flags, struct obd_uuid *uuid)
 342 {
 343         struct llog_log_hdr     *llh;
 344         enum llog_flag           fmt = flags & LLOG_F_EXT_MASK;
 345         int                      rc;
 346         int                     chunk_size = handle->lgh_ctxt->loc_chunk_size;
 347         ENTRY;
 348
 349         LASSERT(handle->lgh_hdr == NULL);
 350
 351         LASSERT(chunk_size >= LLOG_MIN_CHUNK_SIZE);
 352         OBD_ALLOC_LARGE(llh, chunk_size);
 353         if (llh == NULL)
 354                 RETURN(-ENOMEM);
 355
 356         handle->lgh_hdr = llh;
 357         handle->lgh_hdr_size = chunk_size;
 358         /* first assign flags to use llog_client_ops */
 359         llh->llh_flags = flags;
 360         rc = llog_read_header(env, handle, uuid);
 361         if (rc == 0) {
 362                 if (unlikely((llh->llh_flags & LLOG_F_IS_PLAIN &&
 363                               flags & LLOG_F_IS_CAT) ||
 364                              (llh->llh_flags & LLOG_F_IS_CAT &&
 365                               flags & LLOG_F_IS_PLAIN))) {
 366                         CERROR("%s: llog type is %s but initializing %s\n",
 367                                handle->lgh_ctxt->loc_obd->obd_name,
 368                                llh->llh_flags & LLOG_F_IS_CAT ?
 369                                "catalog" : "plain",
 370                                flags & LLOG_F_IS_CAT ? "catalog" : "plain");
 371                         GOTO(out, rc = -EINVAL);
 372                 } else if (llh->llh_flags &
 373                            (LLOG_F_IS_PLAIN | LLOG_F_IS_CAT)) {
 374                         /*
 375                          * it is possible to open llog without specifying llog
 376                          * type so it is taken from llh_flags
 377                          */
 378                         flags = llh->llh_flags;
 379                 } else {
 380                         /* for some reason the llh_flags has no type set */
 381                         CERROR("llog type is not specified!\n");
 382                         GOTO(out, rc = -EINVAL);
 383                 }
 384                 if (unlikely(uuid &&
 385                              !obd_uuid_equals(uuid, &llh->llh_tgtuuid))) {
 386                         CERROR("%s: llog uuid mismatch: %s/%s\n",
 387                                handle->lgh_ctxt->loc_obd->obd_name,
 388                                (char *)uuid->uuid,
 389                                (char *)llh->llh_tgtuuid.uuid);
 390                         GOTO(out, rc = -EEXIST);
 391                 }
 392         }
 393         if (flags & LLOG_F_IS_CAT) {
 394                 LASSERT(list_empty(&handle->u.chd.chd_head));
 395                 INIT_LIST_HEAD(&handle->u.chd.chd_head);
 396                 llh->llh_size = sizeof(struct llog_logid_rec);
 397                 llh->llh_flags |= LLOG_F_IS_FIXSIZE;
 398         } else if (!(flags & LLOG_F_IS_PLAIN)) {
 399                 CERROR("%s: unknown flags: %#x (expected %#x or %#x)\n",
 400                        handle->lgh_ctxt->loc_obd->obd_name,
 401                        flags, LLOG_F_IS_CAT, LLOG_F_IS_PLAIN);
 402                 rc = -EINVAL;
 403         }
 404         llh->llh_flags |= fmt;
 405 out:
 406         if (rc) {
 407                 OBD_FREE_LARGE(llh, chunk_size);
 408                 handle->lgh_hdr = NULL;
 409         }
 410         RETURN(rc);
 411 }
 412 EXPORT_SYMBOL(llog_init_handle);
 413
 414 static int llog_process_thread(void *arg)
 415 {
 416         struct llog_process_info        *lpi = arg;
 417         struct llog_handle              *loghandle = lpi->lpi_loghandle;
 418         struct llog_log_hdr             *llh = loghandle->lgh_hdr;
 419         struct llog_process_cat_data    *cd  = lpi->lpi_catdata;
 420         char                            *buf;
 421         size_t                           chunk_size;
 422         __u64                            cur_offset;
 423         int                              rc = 0, index = 1, last_index;
 424         int                              saved_index = 0;
 425         int                              last_called_index = 0;
 426
 427         ENTRY;
 428
 429         if (llh == NULL)
 430                 RETURN(-EINVAL);
 431
 432         cur_offset = chunk_size = llh->llh_hdr.lrh_len;
 433         /* expect chunk_size to be power of two */
 434         LASSERT(is_power_of_2(chunk_size));
 435
 436         OBD_ALLOC_LARGE(buf, chunk_size);
 437         if (buf == NULL) {
 438                 lpi->lpi_rc = -ENOMEM;
 439                 RETURN(0);
 440         }
 441
 442         if (cd != NULL) {
 443                 last_called_index = cd->lpcd_first_idx;
 444                 index = cd->lpcd_first_idx + 1;
 445         }
 446         if (cd != NULL && cd->lpcd_last_idx)
 447                 last_index = cd->lpcd_last_idx;
 448         else
 449                 last_index = LLOG_HDR_BITMAP_SIZE(llh) - 1;
 450
 451         while (rc == 0) {
 452                 struct llog_rec_hdr *rec;
 453                 off_t chunk_offset;
 454                 unsigned int buf_offset = 0;
 455                 bool partial_chunk;
 456
 457                 /* skip records not set in bitmap */
 458                 while (index <= last_index &&
 459                        !ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
 460                         ++index;
 461
 462                 /* There are no indices prior the last_index */
 463                 if (index > last_index)
 464                         break;
 465
 466                 CDEBUG(D_OTHER, "index: %d last_index %d\n", index,
 467                        last_index);
 468
 469 repeat:
 470                 /* get the buf with our target record; avoid old garbage */
 471                 memset(buf, 0, chunk_size);
 472                 rc = llog_next_block(lpi->lpi_env, loghandle, &saved_index,
 473                                      index, &cur_offset, buf, chunk_size);
 474                 if (rc != 0)
 475                         GOTO(out, rc);
 476
 477                 /* NB: after llog_next_block() call the cur_offset is the
 478                  * offset of the next block after read one.
 479                  * The absolute offset of the current chunk is calculated
 480                  * from cur_offset value and stored in chunk_offset variable.
 481                  */
 482                 if (cur_offset % chunk_size != 0) {
 483                         partial_chunk = true;
 484                         chunk_offset = cur_offset & ~(chunk_size - 1);
 485                 } else {
 486                         partial_chunk = false;
 487                         chunk_offset = cur_offset - chunk_size;
 488                 }
 489
 490                 /* NB: when rec->lrh_len is accessed it is already swabbed
 491                  * since it is used at the "end" of the loop and the rec
 492                  * swabbing is done at the beginning of the loop. */
 493                 for (rec = (struct llog_rec_hdr *)(buf + buf_offset);
 494                      (char *)rec < buf + chunk_size;
 495                      rec = llog_rec_hdr_next(rec)) {
 496
 497                         CDEBUG(D_OTHER, "processing rec 0x%p type %#x\n",
 498                                rec, rec->lrh_type);
 499
 500                         if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 501                                 lustre_swab_llog_rec(rec);
 502
 503                         CDEBUG(D_OTHER, "after swabbing, type=%#x idx=%d\n",
 504                                rec->lrh_type, rec->lrh_index);
 505
 506                         /* for partial chunk the end of it is zeroed, check
 507                          * for index 0 to distinguish it. */
 508                         if (partial_chunk && rec->lrh_index == 0) {
 509                                 /* concurrent llog_add() might add new records
 510                                  * while llog_processing, check this is not
 511                                  * the case and re-read the current chunk
 512                                  * otherwise. */
 513                                 if (index > loghandle->lgh_last_idx)
 514                                         GOTO(out, rc = 0);
 515                                 CDEBUG(D_OTHER, "Re-read last llog buffer for "
 516                                        "new records, index %u, last %u\n",
 517                                        index, loghandle->lgh_last_idx);
 518                                 /* save offset inside buffer for the re-read */
 519                                 buf_offset = (char *)rec - (char *)buf;
 520                                 cur_offset = chunk_offset;
 521                                 goto repeat;
 522                         }
 523
 524                         if (rec->lrh_len == 0 || rec->lrh_len > chunk_size) {
 525                                 CWARN("invalid length %d in llog record for "
 526                                       "index %d/%d\n", rec->lrh_len,
 527                                       rec->lrh_index, index);
 528                                 GOTO(out, rc = -EINVAL);
 529                         }
 530
 531                         if (rec->lrh_index < index) {
 532                                 CDEBUG(D_OTHER, "skipping lrh_index %d\n",
 533                                        rec->lrh_index);
 534                                 continue;
 535                         }
 536
 537                         if (rec->lrh_index != index) {
 538                                 CERROR("%s: Invalid record: index %u but "
 539                                        "expected %u\n",
 540                                        loghandle->lgh_ctxt->loc_obd->obd_name,
 541                                        rec->lrh_index, index);
 542                                 GOTO(out, rc = -ERANGE);
 543                         }
 544
 545                         CDEBUG(D_OTHER,
 546                                "lrh_index: %d lrh_len: %d (%d remains)\n",
 547                                rec->lrh_index, rec->lrh_len,
 548                                (int)(buf + chunk_size - (char *)rec));
 549
 550                         loghandle->lgh_cur_idx = rec->lrh_index;
 551                         loghandle->lgh_cur_offset = (char *)rec - (char *)buf +
 552                                                     chunk_offset;
 553
 554                         /* if set, process the callback on this record */
 555                         if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
 556                                 rc = lpi->lpi_cb(lpi->lpi_env, loghandle, rec,
 557                                                  lpi->lpi_cbdata);
 558                                 last_called_index = index;
 559                                 if (rc == LLOG_PROC_BREAK) {
 560                                         GOTO(out, rc);
 561                                 } else if (rc == LLOG_DEL_RECORD) {
 562                                         rc = llog_cancel_rec(lpi->lpi_env,
 563                                                              loghandle,
 564                                                              rec->lrh_index);
 565                                 }
 566                                 if (rc)
 567                                         GOTO(out, rc);
 568                         }
 569                         /* exit if the last index is reached */
 570                         if (index >= last_index)
 571                                 GOTO(out, rc = 0);
 572                         ++index;
 573                 }
 574         }
 575
 576 out:
 577         if (cd != NULL)
 578                 cd->lpcd_last_idx = last_called_index;
 579
 580         if (unlikely(rc == -EIO && loghandle->lgh_obj != NULL)) {
 581                 if (dt_object_remote(loghandle->lgh_obj)) {
 582                         /* If it is remote object, then -EIO might means
 583                          * disconnection or eviction, let's return -EAGAIN,
 584                          * so for update recovery log processing, it will
 585                          * retry until the umount or abort recovery, see
 586                          * lod_sub_recovery_thread() */
 587                         CERROR("%s retry remote llog process\n",
 588                                loghandle->lgh_ctxt->loc_obd->obd_name);
 589                         rc = -EAGAIN;
 590                 } else {
 591                         /* something bad happened to the processing of a local
 592                          * llog file, probably I/O error or the log got
 593                          * corrupted to be able to finally release the log we
 594                          * discard any remaining bits in the header */
 595                         CERROR("Local llog found corrupted\n");
 596                         while (index <= last_index) {
 597                                 if (ext2_test_bit(index,
 598                                                   LLOG_HDR_BITMAP(llh)) != 0)
 599                                         llog_cancel_rec(lpi->lpi_env, loghandle,
 600                                                         index);
 601                                 index++;
 602                         }
 603                         rc = 0;
 604                 }
 605         }
 606
 607         OBD_FREE_LARGE(buf, chunk_size);
 608         lpi->lpi_rc = rc;
 609         return 0;
 610 }
 611
 612 static int llog_process_thread_daemonize(void *arg)
 613 {
 614         struct llog_process_info        *lpi = arg;
 615         struct lu_env                    env;
 616         int                              rc;
 617
 618         unshare_fs_struct();
 619
 620         /* client env has no keys, tags is just 0 */
 621         rc = lu_env_init(&env, LCT_LOCAL | LCT_MG_THREAD);
 622         if (rc)
 623                 goto out;
 624         lpi->lpi_env = &env;
 625
 626         rc = llog_process_thread(arg);
 627
 628         lu_env_fini(&env);
 629 out:
 630         complete(&lpi->lpi_completion);
 631         return rc;
 632 }
 633
 634 int llog_process_or_fork(const struct lu_env *env,
 635                          struct llog_handle *loghandle,
 636                          llog_cb_t cb, void *data, void *catdata, bool fork)
 637 {
 638         struct llog_process_info *lpi;
 639         int                      rc;
 640
 641         ENTRY;
 642
 643         OBD_ALLOC_PTR(lpi);
 644         if (lpi == NULL) {
 645                 CERROR("cannot alloc pointer\n");
 646                 RETURN(-ENOMEM);
 647         }
 648         lpi->lpi_loghandle = loghandle;
 649         lpi->lpi_cb        = cb;
 650         lpi->lpi_cbdata    = data;
 651         lpi->lpi_catdata   = catdata;
 652
 653         if (fork) {
 654                 struct task_struct *task;
 655
 656                 /* The new thread can't use parent env,
 657                  * init the new one in llog_process_thread_daemonize. */
 658                 lpi->lpi_env = NULL;
 659                 init_completion(&lpi->lpi_completion);
 660                 task = kthread_run(llog_process_thread_daemonize, lpi,
 661                                    "llog_process_thread");
 662                 if (IS_ERR(task)) {
 663                         rc = PTR_ERR(task);
 664                         CERROR("%s: cannot start thread: rc = %d\n",
 665                                loghandle->lgh_ctxt->loc_obd->obd_name, rc);
 666                         GOTO(out_lpi, rc);
 667                 }
 668                 wait_for_completion(&lpi->lpi_completion);
 669         } else {
 670                 lpi->lpi_env = env;
 671                 llog_process_thread(lpi);
 672         }
 673         rc = lpi->lpi_rc;
 674
 675 out_lpi:
 676         OBD_FREE_PTR(lpi);
 677         RETURN(rc);
 678 }
 679 EXPORT_SYMBOL(llog_process_or_fork);
 680
 681 int llog_process(const struct lu_env *env, struct llog_handle *loghandle,
 682                  llog_cb_t cb, void *data, void *catdata)
 683 {
 684         int rc;
 685         rc = llog_process_or_fork(env, loghandle, cb, data, catdata, true);
 686         return rc == LLOG_DEL_PLAIN ? 0 : rc;
 687 }
 688 EXPORT_SYMBOL(llog_process);
 689
 690 int llog_reverse_process(const struct lu_env *env,
 691                          struct llog_handle *loghandle, llog_cb_t cb,
 692                          void *data, void *catdata)
 693 {
 694         struct llog_log_hdr *llh = loghandle->lgh_hdr;
 695         struct llog_process_cat_data *cd = catdata;
 696         void *buf;
 697         int rc = 0, first_index = 1, index, idx;
 698         __u32   chunk_size = llh->llh_hdr.lrh_len;
 699         ENTRY;
 700
 701         OBD_ALLOC_LARGE(buf, chunk_size);
 702         if (buf == NULL)
 703                 RETURN(-ENOMEM);
 704
 705         if (cd != NULL)
 706                 first_index = cd->lpcd_first_idx + 1;
 707         if (cd != NULL && cd->lpcd_last_idx)
 708                 index = cd->lpcd_last_idx;
 709         else
 710                 index = LLOG_HDR_BITMAP_SIZE(llh) - 1;
 711
 712         while (rc == 0) {
 713                 struct llog_rec_hdr *rec;
 714                 struct llog_rec_tail *tail;
 715
 716                 /* skip records not set in bitmap */
 717                 while (index >= first_index &&
 718                        !ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
 719                         --index;
 720
 721                 LASSERT(index >= first_index - 1);
 722                 if (index == first_index - 1)
 723                         break;
 724
 725                 /* get the buf with our target record; avoid old garbage */
 726                 memset(buf, 0, chunk_size);
 727                 rc = llog_prev_block(env, loghandle, index, buf, chunk_size);
 728                 if (rc)
 729                         GOTO(out, rc);
 730
 731                 rec = buf;
 732                 idx = rec->lrh_index;
 733                 CDEBUG(D_RPCTRACE, "index %u : idx %u\n", index, idx);
 734                 while (idx < index) {
 735                         rec = (void *)rec + rec->lrh_len;
 736                         if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 737                                 lustre_swab_llog_rec(rec);
 738                         idx ++;
 739                 }
 740                 LASSERT(idx == index);
 741                 tail = (void *)rec + rec->lrh_len - sizeof(*tail);
 742
 743                 /* process records in buffer, starting where we found one */
 744                 while ((void *)tail > buf) {
 745                         if (tail->lrt_index == 0)
 746                                 GOTO(out, rc = 0); /* no more records */
 747
 748                         /* if set, process the callback on this record */
 749                         if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
 750                                 rec = (void *)tail - tail->lrt_len +
 751                                       sizeof(*tail);
 752
 753                                 rc = cb(env, loghandle, rec, data);
 754                                 if (rc == LLOG_PROC_BREAK) {
 755                                         GOTO(out, rc);
 756                                 } else if (rc == LLOG_DEL_RECORD) {
 757                                         rc = llog_cancel_rec(env, loghandle,
 758                                                              tail->lrt_index);
 759                                 }
 760                                 if (rc)
 761                                         GOTO(out, rc);
 762                         }
 763
 764                         /* previous record, still in buffer? */
 765                         --index;
 766                         if (index < first_index)
 767                                 GOTO(out, rc = 0);
 768                         tail = (void *)tail - tail->lrt_len;
 769                 }
 770         }
 771
 772 out:
 773         if (buf != NULL)
 774                 OBD_FREE_LARGE(buf, chunk_size);
 775         RETURN(rc);
 776 }
 777 EXPORT_SYMBOL(llog_reverse_process);
 778
 779 /**
 780  * new llog API
 781  *
 782  * API functions:
 783  *      llog_open - open llog, may not exist
 784  *      llog_exist - check if llog exists
 785  *      llog_close - close opened llog, pair for open, frees llog_handle
 786  *      llog_declare_create - declare llog creation
 787  *      llog_create - create new llog on disk, need transaction handle
 788  *      llog_declare_write_rec - declaration of llog write
 789  *      llog_write_rec - write llog record on disk, need transaction handle
 790  *      llog_declare_add - declare llog catalog record addition
 791  *      llog_add - add llog record in catalog, need transaction handle
 792  */
 793 int llog_exist(struct llog_handle *loghandle)
 794 {
 795         struct llog_operations  *lop;
 796         int                      rc;
 797
 798         ENTRY;
 799
 800         rc = llog_handle2ops(loghandle, &lop);
 801         if (rc)
 802                 RETURN(rc);
 803         if (lop->lop_exist == NULL)
 804                 RETURN(-EOPNOTSUPP);
 805
 806         rc = lop->lop_exist(loghandle);
 807         RETURN(rc);
 808 }
 809 EXPORT_SYMBOL(llog_exist);
 810
 811 int llog_declare_create(const struct lu_env *env,
 812                         struct llog_handle *loghandle, struct thandle *th)
 813 {
 814         struct llog_operations  *lop;
 815         int                      raised, rc;
 816
 817         ENTRY;
 818
 819         rc = llog_handle2ops(loghandle, &lop);
 820         if (rc)
 821                 RETURN(rc);
 822         if (lop->lop_declare_create == NULL)
 823                 RETURN(-EOPNOTSUPP);
 824
 825         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 826         if (!raised)
 827                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 828         rc = lop->lop_declare_create(env, loghandle, th);
 829         if (!raised)
 830                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 831         RETURN(rc);
 832 }
 833
 834 int llog_create(const struct lu_env *env, struct llog_handle *handle,
 835                 struct thandle *th)
 836 {
 837         struct llog_operations  *lop;
 838         int                      raised, rc;
 839
 840         ENTRY;
 841
 842         rc = llog_handle2ops(handle, &lop);
 843         if (rc)
 844                 RETURN(rc);
 845         if (lop->lop_create == NULL)
 846                 RETURN(-EOPNOTSUPP);
 847
 848         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 849         if (!raised)
 850                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 851         rc = lop->lop_create(env, handle, th);
 852         if (!raised)
 853                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 854         RETURN(rc);
 855 }
 856
 857 int llog_declare_write_rec(const struct lu_env *env,
 858                            struct llog_handle *handle,
 859                            struct llog_rec_hdr *rec, int idx,
 860                            struct thandle *th)
 861 {
 862         struct llog_operations  *lop;
 863         int                      raised, rc;
 864
 865         ENTRY;
 866
 867         rc = llog_handle2ops(handle, &lop);
 868         if (rc)
 869                 RETURN(rc);
 870         LASSERT(lop);
 871         if (lop->lop_declare_write_rec == NULL)
 872                 RETURN(-EOPNOTSUPP);
 873
 874         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 875         if (!raised)
 876                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 877         rc = lop->lop_declare_write_rec(env, handle, rec, idx, th);
 878         if (!raised)
 879                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 880         RETURN(rc);
 881 }
 882
 883 int llog_write_rec(const struct lu_env *env, struct llog_handle *handle,
 884                    struct llog_rec_hdr *rec, struct llog_cookie *logcookies,
 885                    int idx, struct thandle *th)
 886 {
 887         struct llog_operations  *lop;
 888         int                      raised, rc, buflen;
 889
 890         ENTRY;
 891
 892         rc = llog_handle2ops(handle, &lop);
 893         if (rc)
 894                 RETURN(rc);
 895
 896         LASSERT(lop);
 897         if (lop->lop_write_rec == NULL)
 898                 RETURN(-EOPNOTSUPP);
 899
 900         buflen = rec->lrh_len;
 901         LASSERT(cfs_size_round(buflen) == buflen);
 902
 903         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 904         if (!raised)
 905                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 906         rc = lop->lop_write_rec(env, handle, rec, logcookies, idx, th);
 907         if (!raised)
 908                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 909         RETURN(rc);
 910 }
 911
 912 int llog_add(const struct lu_env *env, struct llog_handle *lgh,
 913              struct llog_rec_hdr *rec, struct llog_cookie *logcookies,
 914              struct thandle *th)
 915 {
 916         int raised, rc;
 917
 918         ENTRY;
 919
 920         if (lgh->lgh_logops->lop_add == NULL)
 921                 RETURN(-EOPNOTSUPP);
 922
 923         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 924         if (!raised)
 925                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 926         rc = lgh->lgh_logops->lop_add(env, lgh, rec, logcookies, th);
 927         if (!raised)
 928                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 929         RETURN(rc);
 930 }
 931 EXPORT_SYMBOL(llog_add);
 932
 933 int llog_declare_add(const struct lu_env *env, struct llog_handle *lgh,
 934                      struct llog_rec_hdr *rec, struct thandle *th)
 935 {
 936         int raised, rc;
 937
 938         ENTRY;
 939
 940         if (lgh->lgh_logops->lop_declare_add == NULL)
 941                 RETURN(-EOPNOTSUPP);
 942
 943         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 944         if (!raised)
 945                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 946         rc = lgh->lgh_logops->lop_declare_add(env, lgh, rec, th);
 947         if (!raised)
 948                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 949         RETURN(rc);
 950 }
 951 EXPORT_SYMBOL(llog_declare_add);
 952
 953 /**
 954  * Helper function to open llog or create it if doesn't exist.
 955  * It hides all transaction handling from caller.
 956  */
 957 int llog_open_create(const struct lu_env *env, struct llog_ctxt *ctxt,
 958                      struct llog_handle **res, struct llog_logid *logid,
 959                      char *name)
 960 {
 961         struct dt_device        *d;
 962         struct thandle          *th;
 963         int                      rc;
 964
 965         ENTRY;
 966
 967         rc = llog_open(env, ctxt, res, logid, name, LLOG_OPEN_NEW);
 968         if (rc)
 969                 RETURN(rc);
 970
 971         if (llog_exist(*res))
 972                 RETURN(0);
 973
 974         LASSERT((*res)->lgh_obj != NULL);
 975
 976         d = lu2dt_dev((*res)->lgh_obj->do_lu.lo_dev);
 977
 978         th = dt_trans_create(env, d);
 979         if (IS_ERR(th))
 980                 GOTO(out, rc = PTR_ERR(th));
 981
 982         /* Create update llog object synchronously, which
 983          * happens during inialization process see
 984          * lod_sub_prep_llog(), to make sure the update
 985          * llog object is created before corss-MDT writing
 986          * updates into the llog object */
 987         if (ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID)
 988                 th->th_sync = 1;
 989
 990         th->th_wait_submit = 1;
 991         rc = llog_declare_create(env, *res, th);
 992         if (rc == 0) {
 993                 rc = dt_trans_start_local(env, d, th);
 994                 if (rc == 0)
 995                         rc = llog_create(env, *res, th);
 996         }
 997         dt_trans_stop(env, d, th);
 998 out:
 999         if (rc)
1000                 llog_close(env, *res);
1001         RETURN(rc);
1002 }
1003 EXPORT_SYMBOL(llog_open_create);
1004
1005 /**
1006  * Helper function to delete existent llog.
1007  */
1008 int llog_erase(const struct lu_env *env, struct llog_ctxt *ctxt,
1009                struct llog_logid *logid, char *name)
1010 {
1011         struct llog_handle      *handle;
1012         int                      rc = 0, rc2;
1013
1014         ENTRY;
1015
1016         /* nothing to erase */
1017         if (name == NULL && logid == NULL)
1018                 RETURN(0);
1019
1020         rc = llog_open(env, ctxt, &handle, logid, name, LLOG_OPEN_EXISTS);
1021         if (rc < 0)
1022                 RETURN(rc);
1023
1024         rc = llog_init_handle(env, handle, LLOG_F_IS_PLAIN, NULL);
1025         if (rc == 0)
1026                 rc = llog_destroy(env, handle);
1027
1028         rc2 = llog_close(env, handle);
1029         if (rc == 0)
1030                 rc = rc2;
1031         RETURN(rc);
1032 }
1033 EXPORT_SYMBOL(llog_erase);
1034
1035 /*
1036  * Helper function for write record in llog.
1037  * It hides all transaction handling from caller.
1038  * Valid only with local llog.
1039  */
1040 int llog_write(const struct lu_env *env, struct llog_handle *loghandle,
1041                struct llog_rec_hdr *rec, int idx)
1042 {
1043         struct dt_device        *dt;
1044         struct thandle          *th;
1045         int                      rc;
1046
1047         ENTRY;
1048
1049         LASSERT(loghandle);
1050         LASSERT(loghandle->lgh_ctxt);
1051         LASSERT(loghandle->lgh_obj != NULL);
1052
1053         dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev);
1054
1055         th = dt_trans_create(env, dt);
1056         if (IS_ERR(th))
1057                 RETURN(PTR_ERR(th));
1058
1059         rc = llog_declare_write_rec(env, loghandle, rec, idx, th);
1060         if (rc)
1061                 GOTO(out_trans, rc);
1062
1063         th->th_wait_submit = 1;
1064         rc = dt_trans_start_local(env, dt, th);
1065         if (rc)
1066                 GOTO(out_trans, rc);
1067
1068         down_write(&loghandle->lgh_lock);
1069         rc = llog_write_rec(env, loghandle, rec, NULL, idx, th);
1070         up_write(&loghandle->lgh_lock);
1071 out_trans:
1072         dt_trans_stop(env, dt, th);
1073         RETURN(rc);
1074 }
1075 EXPORT_SYMBOL(llog_write);
1076
1077 int llog_open(const struct lu_env *env, struct llog_ctxt *ctxt,
1078               struct llog_handle **lgh, struct llog_logid *logid,
1079               char *name, enum llog_open_param open_param)
1080 {
1081         int      raised;
1082         int      rc;
1083
1084         ENTRY;
1085
1086         LASSERT(ctxt);
1087         LASSERT(ctxt->loc_logops);
1088
1089         if (ctxt->loc_logops->lop_open == NULL) {
1090                 *lgh = NULL;
1091                 RETURN(-EOPNOTSUPP);
1092         }
1093
1094         *lgh = llog_alloc_handle();
1095         if (*lgh == NULL)
1096                 RETURN(-ENOMEM);
1097         (*lgh)->lgh_ctxt = ctxt;
1098         (*lgh)->lgh_logops = ctxt->loc_logops;
1099
1100         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
1101         if (!raised)
1102                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
1103         rc = ctxt->loc_logops->lop_open(env, *lgh, logid, name, open_param);
1104         if (!raised)
1105                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
1106         if (rc) {
1107                 llog_free_handle(*lgh);
1108                 *lgh = NULL;
1109         }
1110         RETURN(rc);
1111 }
1112 EXPORT_SYMBOL(llog_open);
1113
1114 int llog_close(const struct lu_env *env, struct llog_handle *loghandle)
1115 {
1116         struct llog_operations  *lop;
1117         int                      rc;
1118
1119         ENTRY;
1120
1121         rc = llog_handle2ops(loghandle, &lop);
1122         if (rc)
1123                 GOTO(out, rc);
1124         if (lop->lop_close == NULL)
1125                 GOTO(out, rc = -EOPNOTSUPP);
1126         rc = lop->lop_close(env, loghandle);
1127 out:
1128         llog_handle_put(loghandle);
1129         RETURN(rc);
1130 }
1131 EXPORT_SYMBOL(llog_close);
1132
1133 /**
1134  * Helper function to get the llog size in records. It is used by MGS
1135  * mostly to check that config llog exists and contains data.
1136  *
1137  * \param[in] env       execution environment
1138  * \param[in] ctxt      llog context
1139  * \param[in] name      llog name
1140  *
1141  * \retval              true if there are records in llog besides a header
1142  * \retval              false on error or llog without records
1143  */
1144 int llog_is_empty(const struct lu_env *env, struct llog_ctxt *ctxt,
1145                   char *name)
1146 {
1147         struct llog_handle      *llh;
1148         int                      rc = 0;
1149
1150         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1151         if (rc < 0) {
1152                 if (likely(rc == -ENOENT))
1153                         rc = 0;
1154                 GOTO(out, rc);
1155         }
1156
1157         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1158         if (rc)
1159                 GOTO(out_close, rc);
1160         rc = llog_get_size(llh);
1161
1162 out_close:
1163         llog_close(env, llh);
1164 out:
1165         /* The header is record 1, the llog is still considered as empty
1166          * if there is only header */
1167         return (rc <= 1);
1168 }
1169 EXPORT_SYMBOL(llog_is_empty);
1170
1171 int llog_copy_handler(const struct lu_env *env, struct llog_handle *llh,
1172                       struct llog_rec_hdr *rec, void *data)
1173 {
1174         struct llog_handle      *copy_llh = data;
1175
1176         /* Append all records */
1177         return llog_write(env, copy_llh, rec, LLOG_NEXT_IDX);
1178 }
1179
1180 /* backup plain llog */
1181 int llog_backup(const struct lu_env *env, struct obd_device *obd,
1182                 struct llog_ctxt *ctxt, struct llog_ctxt *bctxt,
1183                 char *name, char *backup)
1184 {
1185         struct llog_handle      *llh, *bllh;
1186         int                      rc;
1187
1188         ENTRY;
1189
1190         /* open original log */
1191         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1192         if (rc < 0) {
1193                 /* the -ENOENT case is also reported to the caller
1194                  * but silently so it should handle that if needed.
1195                  */
1196                 if (rc != -ENOENT)
1197                         CERROR("%s: failed to open log %s: rc = %d\n",
1198                                obd->obd_name, name, rc);
1199                 RETURN(rc);
1200         }
1201
1202         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1203         if (rc)
1204                 GOTO(out_close, rc);
1205
1206         /* Make sure there's no old backup log */
1207         rc = llog_erase(env, bctxt, NULL, backup);
1208         if (rc < 0 && rc != -ENOENT)
1209                 GOTO(out_close, rc);
1210
1211         /* open backup log */
1212         rc = llog_open_create(env, bctxt, &bllh, NULL, backup);
1213         if (rc) {
1214                 CERROR("%s: failed to open backup logfile %s: rc = %d\n",
1215                        obd->obd_name, backup, rc);
1216                 GOTO(out_close, rc);
1217         }
1218
1219         /* check that backup llog is not the same object as original one */
1220         if (llh->lgh_obj == bllh->lgh_obj) {
1221                 CERROR("%s: backup llog %s to itself (%s), objects %p/%p\n",
1222                        obd->obd_name, name, backup, llh->lgh_obj,
1223                        bllh->lgh_obj);
1224                 GOTO(out_backup, rc = -EEXIST);
1225         }
1226
1227         rc = llog_init_handle(env, bllh, LLOG_F_IS_PLAIN, NULL);
1228         if (rc)
1229                 GOTO(out_backup, rc);
1230
1231         /* Copy log record by record */
1232         rc = llog_process_or_fork(env, llh, llog_copy_handler, (void *)bllh,
1233                                   NULL, false);
1234         if (rc)
1235                 CERROR("%s: failed to backup log %s: rc = %d\n",
1236                        obd->obd_name, name, rc);
1237 out_backup:
1238         llog_close(env, bllh);
1239 out_close:
1240         llog_close(env, llh);
1241         RETURN(rc);
1242 }
1243 EXPORT_SYMBOL(llog_backup);