lustre/lvfs/llog_lvfs.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/lvfs.h>
  42 #include <linux/lustre_fsfilt.h>
  43 #include <linux/lustre_log.h>
  44
  45 #ifdef __KERNEL__
  46
  47 static int llog_lvfs_pad(struct llog_ctxt *ctxt, struct l_file *file,
  48                          int len, int index)
  49 {
  50         struct llog_rec_hdr rec;
  51         struct llog_rec_tail tail;
  52         int rc;
  53         ENTRY;
  54
  55         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
  56
  57         tail.lrt_len = rec.lrh_len = cpu_to_le32(len);
  58         tail.lrt_index = rec.lrh_index = cpu_to_le32(index);
  59         rec.lrh_type = 0;
  60
  61         rc = llog_fsfilt_write_record(ctxt, file, &rec, sizeof(rec),
  62                                       &file->f_pos, 0);
  63         if (rc) {
  64                 CERROR("error writing padding record: rc %d\n", rc);
  65                 goto out;
  66         }
  67
  68         file->f_pos += len - sizeof(rec) - sizeof(tail);
  69         rc = llog_fsfilt_write_record(ctxt, file, &tail, sizeof(tail),
  70                                       &file->f_pos, 0);
  71         if (rc) {
  72                 CERROR("error writing padding record: rc %d\n", rc);
  73                 goto out;
  74         }
  75
  76  out:
  77         RETURN(rc);
  78 }
  79
  80 static int llog_lvfs_write_blob(struct llog_ctxt *ctxt, struct l_file *file,
  81                                 struct llog_rec_hdr *rec, void *buf, loff_t off)
  82 {
  83         int rc;
  84         struct llog_rec_tail end;
  85         loff_t saved_off = file->f_pos;
  86         int buflen = le32_to_cpu(rec->lrh_len);
  87
  88         ENTRY;
  89         file->f_pos = off;
  90
  91         if (!buf) {
  92                 rc = llog_fsfilt_write_record(ctxt, file, rec, buflen,
  93                                               &file->f_pos, 0);
  94                 if (rc) {
  95                         CERROR("error writing log record: rc %d\n", rc);
  96                         goto out;
  97                 }
  98                 GOTO(out, rc = 0);
  99         }
 100
 101         /* the buf case */
 102         rec->lrh_len = cpu_to_le32(sizeof(*rec) + buflen + sizeof(end));
 103         rc = llog_fsfilt_write_record(ctxt, file, rec, sizeof(*rec),
 104                                       &file->f_pos, 0);
 105         if (rc) {
 106                 CERROR("error writing log hdr: rc %d\n", rc);
 107                 goto out;
 108         }
 109
 110         rc = llog_fsfilt_write_record(ctxt, file, buf, buflen,
 111                                       &file->f_pos, 0);
 112         if (rc) {
 113                 CERROR("error writing log buffer: rc %d\n", rc);
 114                 goto out;
 115         }
 116
 117         end.lrt_len = rec->lrh_len;
 118         end.lrt_index = rec->lrh_index;
 119         rc = llog_fsfilt_write_record(ctxt, file, &end, sizeof(end),
 120                                       &file->f_pos, 0);
 121         if (rc) {
 122                 CERROR("error writing log tail: rc %d\n", rc);
 123                 goto out;
 124         }
 125
 126         rc = 0;
 127  out:
 128         if (saved_off > file->f_pos)
 129                 file->f_pos = saved_off;
 130         LASSERT(rc <= 0);
 131         RETURN(rc);
 132 }
 133
 134 static int llog_lvfs_read_blob(struct llog_ctxt *ctxt, struct l_file *file,
 135                                void *buf, int size, loff_t off)
 136 {
 137         loff_t offset = off;
 138         int rc;
 139         ENTRY;
 140
 141         rc = llog_fsfilt_read_record(ctxt, file, buf, size, &offset);
 142         if (rc) {
 143                 CERROR("error reading log record: rc %d\n", rc);
 144                 RETURN(rc);
 145         }
 146         RETURN(0);
 147 }
 148
 149 static int llog_lvfs_read_header(struct llog_handle *handle)
 150 {
 151         struct llog_ctxt *ctxt = handle->lgh_ctxt;
 152         int rc;
 153         ENTRY;
 154
 155         LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
 156         LASSERT(ctxt != NULL);
 157
 158         if (handle->lgh_file->f_dentry->d_inode->i_size == 0) {
 159                 CDEBUG(D_HA, "not reading header from 0-byte log\n");
 160                 RETURN(LLOG_EEMPTY);
 161         }
 162
 163         rc = llog_lvfs_read_blob(ctxt, handle->lgh_file, handle->lgh_hdr,
 164                                  LLOG_CHUNK_SIZE, 0);
 165         if (rc)
 166                 CERROR("error reading log header\n");
 167
 168         handle->lgh_last_idx = le32_to_cpu(handle->lgh_hdr->llh_tail.lrt_index);
 169         handle->lgh_file->f_pos = handle->lgh_file->f_dentry->d_inode->i_size;
 170
 171         RETURN(rc);
 172 }
 173
 174 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 175 /* appends if idx == -1, otherwise overwrites record idx. */
 176 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 177                                struct llog_rec_hdr *rec,
 178                                struct llog_cookie *reccookie,
 179                                int cookiecount,
 180                                void *buf, int idx)
 181 {
 182         struct llog_log_hdr *llh;
 183         int reclen = le32_to_cpu(rec->lrh_len), index, rc;
 184         struct llog_rec_tail *lrt;
 185         struct llog_ctxt *ctxt = loghandle->lgh_ctxt;
 186         struct file *file;
 187         loff_t offset;
 188         size_t left;
 189         ENTRY;
 190
 191         llh = loghandle->lgh_hdr;
 192         file = loghandle->lgh_file;
 193
 194         /* record length should not bigger than LLOG_CHUNK_SIZE */
 195         if (buf)
 196                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr)
 197                       - sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 198         else
 199                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 200         if (rc)
 201                 RETURN(rc);
 202
 203         if (idx != -1) {
 204                 loff_t saved_offset;
 205
 206                 /* no header: only allowed to insert record 1 */
 207                 if (idx > 1 && !file->f_dentry->d_inode->i_size) {
 208                         CERROR("idx != -1 in empty log\n");
 209                         LBUG();
 210                 }
 211
 212                 if (idx && llh->llh_size && llh->llh_size != reclen)
 213                         RETURN(-EINVAL);
 214
 215                 rc = llog_lvfs_write_blob(ctxt, file, &llh->llh_hdr, NULL, 0);
 216                 /* we are done if we only write the header or on error */
 217                 if (rc || idx == 0)
 218                         RETURN(rc);
 219
 220                 saved_offset = sizeof(*llh) + (idx-1)*le32_to_cpu(rec->lrh_len);
 221                 rc = llog_lvfs_write_blob(ctxt, file, rec, buf, saved_offset);
 222                 if (rc == 0 && reccookie) {
 223                         reccookie->lgc_lgl = loghandle->lgh_id;
 224                         reccookie->lgc_index = idx;
 225                         rc = 1;
 226                 }
 227                 RETURN(rc);
 228         }
 229
 230         /* Make sure that records don't cross a chunk boundary, so we can
 231          * process them page-at-a-time if needed.  If it will cross a chunk
 232          * boundary, write in a fake (but referenced) entry to pad the chunk.
 233          *
 234          * We know that llog_current_log() will return a loghandle that is
 235          * big enough to hold reclen, so all we care about is padding here.
 236          */
 237         left = LLOG_CHUNK_SIZE - (file->f_pos & (LLOG_CHUNK_SIZE - 1));
 238         if (buf)
 239                 reclen = sizeof(*rec) + le32_to_cpu(rec->lrh_len) +
 240                          sizeof(struct llog_rec_tail);
 241
 242         /* NOTE: padding is a record, but no bit is set */
 243         if (left != 0 && left != reclen &&
 244             left < (reclen + LLOG_MIN_REC_SIZE)) {
 245                 loghandle->lgh_last_idx++;
 246                 rc = llog_lvfs_pad(ctxt, file, left, loghandle->lgh_last_idx);
 247                 if (rc)
 248                         RETURN(rc);
 249                 /* if it's the last idx in log file, then return -ENOSPC */
 250                 if (loghandle->lgh_last_idx == LLOG_BITMAP_SIZE(llh) - 1)
 251                         RETURN(-ENOSPC);
 252         }
 253
 254         loghandle->lgh_last_idx++;
 255         index = loghandle->lgh_last_idx;
 256         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 257         rec->lrh_index = cpu_to_le32(index);
 258         if (buf == NULL) {
 259                 lrt = (void *)rec + le32_to_cpu(rec->lrh_len) - sizeof(*lrt);
 260                 lrt->lrt_len = rec->lrh_len;
 261                 lrt->lrt_index = rec->lrh_index;
 262         }
 263         if (ext2_set_bit(index, llh->llh_bitmap)) {
 264                 CERROR("argh, index %u already set in log bitmap?\n", index);
 265                 LBUG(); /* should never happen */
 266         }
 267         llh->llh_count = cpu_to_le32(le32_to_cpu(llh->llh_count) + 1);
 268         llh->llh_tail.lrt_index = cpu_to_le32(index);
 269
 270         offset = 0;
 271         rc = llog_lvfs_write_blob(ctxt, file, &llh->llh_hdr, NULL, 0);
 272         if (rc)
 273                 RETURN(rc);
 274
 275         CDEBUG(D_HA, "adding record "LPX64": idx: %u, %u bytes off: %lld\n",
 276                loghandle->lgh_id.lgl_oid, index, le32_to_cpu(rec->lrh_len),
 277                file->f_pos);
 278
 279         rc = llog_lvfs_write_blob(ctxt, file, rec, buf, file->f_pos);
 280         if (rc)
 281                 RETURN(rc);
 282
 283         if (rc == 0 && reccookie) {
 284                 if (llog_cookie_get_flags(reccookie) & LLOG_COOKIE_REPLAY) {
 285                         LASSERTF(EQ_LOGID(reccookie->lgc_lgl,loghandle->lgh_id),
 286                                  "lgc_lgl.oid/gr "LPU64"/"LPU64" lgh_id.oid/gr"
 287                                  LPU64"/"LPU64"\n",
 288                                  reccookie->lgc_lgl.lgl_oid,
 289                                  reccookie->lgc_lgl.lgl_ogr,
 290                                  loghandle->lgh_id.lgl_oid,
 291                                  loghandle->lgh_id.lgl_oid);
 292                         LASSERTF(reccookie->lgc_index == index,
 293                                  "lgc_index %u != index %u\n",
 294                                  reccookie->lgc_index, index);
 295                 } else {
 296                         reccookie->lgc_lgl = loghandle->lgh_id;
 297                         reccookie->lgc_index = index;
 298                         llog_cookie_add_flags(reccookie, LLOG_COOKIE_REPLAY);
 299                 }
 300
 301                 if (le32_to_cpu(rec->lrh_type) == MDS_UNLINK_REC)
 302                         reccookie->lgc_subsys = LLOG_UNLINK_ORIG_CTXT;
 303                 else if (le32_to_cpu(rec->lrh_type) == OST_SZ_REC)
 304                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 305                 else if (le32_to_cpu(rec->lrh_type) == OST_RAID1_REC)
 306                         reccookie->lgc_subsys = LLOG_RD1_ORIG_CTXT;
 307                 else
 308                         reccookie->lgc_subsys = -1;
 309                 rc = 1;
 310         }
 311         if (rc == 0 && (le32_to_cpu(rec->lrh_type) == LLOG_GEN_REC ||
 312             le32_to_cpu(rec->lrh_type) == SMFS_UPDATE_REC))
 313                 rc = 1;
 314
 315         RETURN(rc);
 316 }
 317
 318 /* We can skip reading at least as many log blocks as the number of
 319 * minimum sized log records we are skipping.  If it turns out
 320 * that we are not far enough along the log (because the
 321 * actual records are larger than minimum size) we just skip
 322 * some more records. */
 323
 324 static void llog_skip_over(__u64 *off, int curr, int goal)
 325 {
 326         if (goal <= curr)
 327                 return;
 328         *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
 329                 ~(LLOG_CHUNK_SIZE - 1);
 330 }
 331
 332 /* sets:
 333  *  - curr_offset to the furthest point read in the log file
 334  *  - curr_idx to the log index preceeding curr_offset
 335  * returns -EIO/-EINVAL on error
 336  */
 337 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *curr_idx,
 338                                 int next_idx, __u64 *curr_offset, void *buf,
 339                                 int len)
 340 {
 341         struct llog_ctxt *ctxt = loghandle->lgh_ctxt;
 342         ENTRY;
 343
 344         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 345                 RETURN(-EINVAL);
 346
 347         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 348                next_idx, *curr_idx, *curr_offset);
 349
 350         while (*curr_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 351                 struct llog_rec_hdr *rec;
 352                 struct llog_rec_tail *tail;
 353                 loff_t ppos;
 354                 int nbytes, rc;
 355
 356                 llog_skip_over(curr_offset, *curr_idx, next_idx);
 357
 358                 ppos = *curr_offset;
 359                 rc = llog_fsfilt_read_record(ctxt, loghandle->lgh_file,
 360                                              buf, len, &ppos);
 361
 362                 if (rc) {
 363                         CERROR("Cant read llog block at log id "LPU64
 364                                "/%u offset "LPU64"\n",
 365                                loghandle->lgh_id.lgl_oid,
 366                                loghandle->lgh_id.lgl_ogen,
 367                                *curr_offset);
 368                         RETURN(rc);
 369                 }
 370
 371                 nbytes = ppos - *curr_offset;
 372                 *curr_offset = ppos;
 373
 374                 if (nbytes == 0) /* end of file, nothing to do */
 375                         RETURN(0);
 376
 377                 if (nbytes < sizeof(*tail)) {
 378                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 379                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 380                                loghandle->lgh_id.lgl_ogen, *curr_offset);
 381                         RETURN(-EINVAL);
 382                 }
 383
 384                 tail = buf + nbytes - sizeof(struct llog_rec_tail);
 385                 *curr_idx = le32_to_cpu(tail->lrt_index);
 386
 387                 /* this shouldn't happen */
 388                 if (tail->lrt_index == 0) {
 389                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 390                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 391                                loghandle->lgh_id.lgl_ogen, *curr_offset);
 392                         RETURN(-EINVAL);
 393                 }
 394                 if (le32_to_cpu(tail->lrt_index) < next_idx)
 395                         continue;
 396
 397                 /* sanity check that the start of the new buffer is no farther
 398                  * than the record that we wanted.  This shouldn't happen. */
 399                 rec = buf;
 400                 if (le32_to_cpu(rec->lrh_index) > next_idx) {
 401                         CERROR("missed desired record? %u > %u\n",
 402                                le32_to_cpu(rec->lrh_index), next_idx);
 403                         RETURN(-ENOENT);
 404                 }
 405                 RETURN(0);
 406         }
 407         RETURN(-EIO);
 408 }
 409
 410 static int llog_lvfs_prev_block(struct llog_handle *loghandle,
 411                                 int prev_idx, void *buf, int len)
 412 {
 413         struct llog_ctxt *ctxt = loghandle->lgh_ctxt;
 414         __u64 curr_offset;
 415         int rc;
 416         ENTRY;
 417
 418         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 419                 RETURN(-EINVAL);
 420
 421         CDEBUG(D_OTHER, "looking for log index %u n", prev_idx);
 422
 423         curr_offset = LLOG_CHUNK_SIZE;
 424         llog_skip_over(&curr_offset, 0, prev_idx);
 425
 426         while (curr_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 427                 struct llog_rec_hdr *rec;
 428                 struct llog_rec_tail *tail;
 429                 loff_t ppos;
 430
 431                 ppos = curr_offset;
 432                 rc = llog_fsfilt_read_record(ctxt, loghandle->lgh_file,
 433                                              buf, len, &ppos);
 434
 435                 if (rc) {
 436                         CERROR("Cant read llog block at log id "LPU64
 437                                "/%u offset "LPU64"\n",
 438                                loghandle->lgh_id.lgl_oid,
 439                                loghandle->lgh_id.lgl_ogen,
 440                                curr_offset);
 441                         RETURN(rc);
 442                 }
 443
 444                 /* put number of bytes read into rc to make code simpler */
 445                 rc = ppos - curr_offset;
 446                 curr_offset = ppos;
 447
 448                 if (rc == 0) /* end of file, nothing to do */
 449                         RETURN(0);
 450
 451                 if (rc < sizeof(*tail)) {
 452                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 453                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 454                                loghandle->lgh_id.lgl_ogen, curr_offset);
 455                         RETURN(-EINVAL);
 456                 }
 457
 458                 tail = buf + rc - sizeof(struct llog_rec_tail);
 459
 460                 /* this shouldn't happen */
 461                 if (tail->lrt_index == 0) {
 462                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 463                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 464                                loghandle->lgh_id.lgl_ogen, curr_offset);
 465                         RETURN(-EINVAL);
 466                 }
 467                 if (le32_to_cpu(tail->lrt_index) < prev_idx)
 468                         continue;
 469
 470                 /* sanity check that the start of the new buffer is no farther
 471                  * than the record that we wanted.  This shouldn't happen. */
 472                 rec = buf;
 473                 if (le32_to_cpu(rec->lrh_index) > prev_idx) {
 474                         CERROR("missed desired record? %u > %u\n",
 475                                le32_to_cpu(rec->lrh_index), prev_idx);
 476                         RETURN(-ENOENT);
 477                 }
 478                 RETURN(0);
 479         }
 480         RETURN(-EIO);
 481 }
 482
 483 static struct file *llog_filp_open(char *name, int flags, int mode)
 484 {
 485         char *logname;
 486         struct file *filp;
 487         int len;
 488
 489         OBD_ALLOC(logname, PATH_MAX);
 490         if (logname == NULL)
 491                 return ERR_PTR(-ENOMEM);
 492
 493         len = snprintf(logname, PATH_MAX, "LOGS/%s", name);
 494         if (len >= PATH_MAX - 1) {
 495                 filp = ERR_PTR(-ENAMETOOLONG);
 496         } else {
 497                 filp = l_filp_open(logname, flags, mode);
 498                 if (IS_ERR(filp)) {
 499                         CERROR("logfile %s(%s): %ld\n",
 500                                flags & O_CREAT ? "create" : "open", logname,
 501                                PTR_ERR(filp));
 502                 }
 503         }
 504
 505         OBD_FREE(logname, PATH_MAX);
 506         return filp;
 507 }
 508
 509 /* creates object for the case when we have no obd (smfs). */
 510 static struct file *
 511 llog_object_create_alone(struct llog_ctxt *ctxt, struct llog_logid *lgh_id)
 512 {
 513         struct file *filp;
 514         int rc = 0;
 515         ENTRY;
 516
 517         LASSERT(lgh_id != NULL);
 518         if (lgh_id->lgl_oid) {
 519                 struct dentry *dchild;
 520                 char id_name[LL_ID_NAMELEN];
 521                 int id_len = 0;
 522
 523                 down(&ctxt->loc_objects_dir->d_inode->i_sem);
 524                 id_len = ll_id2str(id_name, lgh_id->lgl_oid,
 525                                        lgh_id->lgl_ogen);
 526
 527                 dchild = lookup_one_len(id_name, ctxt->loc_objects_dir,
 528                                         id_len);
 529                 if (IS_ERR(dchild)) {
 530                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 531                         RETURN((struct file *)dchild);
 532                 }
 533                 if (dchild->d_inode == NULL) {
 534                         struct dentry_params dp;
 535                         struct inode *inode;
 536
 537                         dchild->d_fsdata = (void *) &dp;
 538                         dp.p_ptr = NULL;
 539                         dp.p_inum = lgh_id->lgl_oid;
 540                         rc = ll_vfs_create(ctxt->loc_objects_dir->d_inode,
 541                                            dchild, S_IFREG, NULL);
 542                         if (dchild->d_fsdata == (void *)(unsigned long)lgh_id->lgl_oid)
 543                                 dchild->d_fsdata = NULL;
 544                         if (rc) {
 545                                 CDEBUG(D_INODE, "err during create: %d\n", rc);
 546                                 dput(dchild);
 547                                 up(&ctxt->loc_objects_dir->d_inode->i_sem);
 548                                 RETURN(ERR_PTR(rc));
 549                         }
 550                         inode = dchild->d_inode;
 551                         LASSERT(inode->i_ino == lgh_id->lgl_oid);
 552                         inode->i_generation = lgh_id->lgl_ogen;
 553                         CDEBUG(D_HA, "recreated ino %lu with gen %u\n",
 554                                inode->i_ino, inode->i_generation);
 555                         mark_inode_dirty(inode);
 556                 }
 557
 558                 mntget(ctxt->loc_lvfs_ctxt->pwdmnt);
 559                 filp = dentry_open(dchild, ctxt->loc_lvfs_ctxt->pwdmnt,
 560                                     O_RDWR | O_LARGEFILE);
 561                 if (IS_ERR(filp)) {
 562                         dput(dchild);
 563                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 564                         RETURN(filp);
 565                 }
 566                 if (!S_ISREG(filp->f_dentry->d_inode->i_mode)) {
 567                         CERROR("%s is not a regular file!: mode = %o\n",
 568                                id_name, filp->f_dentry->d_inode->i_mode);
 569                         filp_close(filp, 0);
 570                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 571                         RETURN(ERR_PTR(-ENOENT));
 572                 }
 573
 574                 up(&ctxt->loc_objects_dir->d_inode->i_sem);
 575                 RETURN(filp);
 576
 577         } else {
 578                 unsigned int tmpname = ll_insecure_random_int();
 579                 char id_name[LL_ID_NAMELEN];
 580                 struct dentry *new_child, *parent;
 581                 int err, id_len;
 582                 void *handle;
 583
 584                 sprintf(id_name, "OBJECTS/%u", tmpname);
 585                 filp = filp_open(id_name, O_CREAT | O_EXCL, 0644);
 586                 if (IS_ERR(filp)) {
 587                         rc = PTR_ERR(filp);
 588                         if (rc == -EEXIST) {
 589                                 CERROR("impossible object name collision %u\n",
 590                                         tmpname);
 591                                 LBUG();
 592                         }
 593                         CERROR("error creating tmp object %u: rc %d\n", tmpname, rc);
 594                         RETURN(filp);
 595                 }
 596
 597                 id_len = ll_id2str(id_name, filp->f_dentry->d_inode->i_ino,
 598                                        filp->f_dentry->d_inode->i_generation);
 599                 parent = filp->f_dentry->d_parent;
 600                 down(&parent->d_inode->i_sem);
 601                 new_child = lookup_one_len(id_name, parent, id_len);
 602                 if (IS_ERR(new_child)) {
 603                         CERROR("getting neg dentry for obj rename: %d\n", rc);
 604                         GOTO(out_close, rc = PTR_ERR(new_child));
 605                 }
 606                 if (new_child->d_inode != NULL) {
 607                         CERROR("impossible non-negative obj dentry %lu:%u!\n",
 608                                 filp->f_dentry->d_inode->i_ino,
 609                                 filp->f_dentry->d_inode->i_generation);
 610                         LBUG();
 611                 }
 612
 613                 handle = llog_fsfilt_start(ctxt, parent->d_inode, FSFILT_OP_RENAME, NULL);
 614                 if (IS_ERR(handle))
 615                         GOTO(out_dput, rc = PTR_ERR(handle));
 616
 617                 lock_kernel();
 618                 rc = vfs_rename(parent->d_inode, filp->f_dentry,
 619                                 parent->d_inode, new_child);
 620                 unlock_kernel();
 621                 if (rc)
 622                         CERROR("error renaming new object %lu:%u: rc %d\n",
 623                                 filp->f_dentry->d_inode->i_ino,
 624                                 filp->f_dentry->d_inode->i_generation, rc);
 625
 626                 err = llog_fsfilt_commit(ctxt, parent->d_inode, handle, 0);
 627                 if (!rc)
 628                         rc = err;
 629
 630         out_dput:
 631                 dput(new_child);
 632         out_close:
 633                 up(&parent->d_inode->i_sem);
 634                 if (rc) {
 635                         filp_close(filp, 0);
 636                         filp = ERR_PTR(rc);
 637                 } else {
 638                         /* FIXME: is this group 1 is correct? */
 639                         lgh_id->lgl_ogr = 1;
 640                         lgh_id->lgl_oid = filp->f_dentry->d_inode->i_ino;
 641                         lgh_id->lgl_ogen = filp->f_dentry->d_inode->i_generation;
 642                 }
 643                 RETURN(filp);
 644         }
 645 }
 646
 647 /* creates object for generic case (obd exists) */
 648 static struct file *
 649 llog_object_create_generic(struct llog_ctxt *ctxt, struct llog_logid *lgh_id)
 650 {
 651         struct file *filp = NULL;
 652         struct dentry *dchild;
 653         struct obd_device *obd;
 654         struct obdo *oa = NULL;
 655         int open_flags = O_RDWR | O_LARGEFILE;
 656         int rc = 0;
 657         ENTRY;
 658
 659         obd = ctxt->loc_exp->exp_obd;
 660         LASSERT(obd != NULL);
 661
 662         if (lgh_id->lgl_oid) {
 663                 dchild = obd_lvfs_id2dentry(ctxt->loc_exp, lgh_id->lgl_oid,
 664                                             lgh_id->lgl_ogen, lgh_id->lgl_ogr);
 665                 if (IS_ERR(dchild) == -ENOENT) {
 666                         OBD_ALLOC(oa, sizeof(*oa));
 667                         if (!oa)
 668                                 RETURN(ERR_PTR(-ENOMEM));
 669
 670                         oa->o_id = lgh_id->lgl_oid;
 671                         oa->o_generation = lgh_id->lgl_ogen;
 672                         oa->o_gr = lgh_id->lgl_ogr;
 673                         oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 674                         rc = obd_create(ctxt->loc_exp, oa, NULL, 0, NULL, NULL);
 675                         if (rc) {
 676                                 CDEBUG(D_INODE, "err during create: %d\n", rc);
 677                                 GOTO(out_free_oa, rc);
 678                         }
 679                         CDEBUG(D_HA, "re-create log object "LPX64":0x%x:"LPX64"\n",
 680                                lgh_id->lgl_oid, lgh_id->lgl_ogen, lgh_id->lgl_ogr);
 681
 682                         dchild = obd_lvfs_id2dentry(ctxt->loc_exp, lgh_id->lgl_oid,
 683                                                     lgh_id->lgl_ogen, lgh_id->lgl_ogr);
 684                 } else if (IS_ERR(dchild)) {
 685                         CERROR("error looking up logfile "LPX64":0x%x: rc %d\n",
 686                                lgh_id->lgl_oid, lgh_id->lgl_ogen, rc);
 687                         RETURN((struct file *)dchild);
 688                 }
 689
 690                 filp = l_dentry_open(&obd->obd_lvfs_ctxt, dchild, open_flags);
 691                 if (IS_ERR(filp)) {
 692                         l_dput(dchild);
 693                         rc = PTR_ERR(filp);
 694                         CERROR("error opening logfile "LPX64"0x%x: rc %d\n",
 695                                lgh_id->lgl_oid, lgh_id->lgl_ogen, rc);
 696                 }
 697                 GOTO(out_free_oa, rc);
 698         } else {
 699                 /* this is important to work here over obd_create() as it manages
 700                   groups and we need it. Yet another reason is that mds_obd_create()
 701                  is fully the same as old version of this function and this helps
 702                  us to avoid code duplicating and layering violating. */
 703                 OBD_ALLOC(oa, sizeof(*oa));
 704                 if (!oa)
 705                         RETURN(ERR_PTR(-ENOMEM));
 706
 707                 oa->o_gr = FILTER_GROUP_LLOG;
 708                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 709                 rc = obd_create(ctxt->loc_exp, oa, NULL, 0, NULL, NULL);
 710                 if (rc)
 711                         GOTO(out_free_oa, rc);
 712
 713                 dchild = obd_lvfs_id2dentry(ctxt->loc_exp, oa->o_id,
 714                                             oa->o_generation, oa->o_gr);
 715                 if (IS_ERR(dchild))
 716                         GOTO(out_free_oa, rc = PTR_ERR(dchild));
 717
 718                 filp = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 719                                      open_flags);
 720                 if (IS_ERR(filp)) {
 721                         l_dput(dchild);
 722                         GOTO(out_free_oa, rc = PTR_ERR(filp));
 723                 }
 724
 725                 /* group 1 is not longer valid, we use the group which is set
 726                 by obd_create()->mds_obd_create(). */
 727                 lgh_id->lgl_ogr = oa->o_gr;
 728                 lgh_id->lgl_oid = oa->o_id;
 729                 lgh_id->lgl_ogen = oa->o_generation;
 730         }
 731
 732 out_free_oa:
 733         if (rc)
 734                 filp = ERR_PTR(rc);
 735         if (oa)
 736                 OBD_FREE(oa, sizeof(*oa));
 737         RETURN(filp);
 738 }
 739
 740 static struct file *
 741 llog_object_create(struct llog_ctxt *ctxt, struct llog_logid *lgh_id)
 742 {
 743         if (ctxt->loc_alone)
 744                 return llog_object_create_alone(ctxt, lgh_id);
 745         else
 746                 return llog_object_create_generic(ctxt, lgh_id);
 747 }
 748
 749 static int llog_add_link_object(struct llog_ctxt *ctxt, struct llog_logid logid,
 750                                 struct dentry *dentry)
 751 {
 752         struct dentry *new_child;
 753         char id_name[LL_ID_NAMELEN];
 754         void *handle;
 755         int id_len, rc = 0, err;
 756         ENTRY;
 757
 758         id_len = ll_id2str(id_name, logid.lgl_oid, logid.lgl_ogen);
 759         down(&ctxt->loc_objects_dir->d_inode->i_sem);
 760         new_child = lookup_one_len(id_name, ctxt->loc_objects_dir, id_len);
 761         if (IS_ERR(new_child)) {
 762                 CERROR("getting neg dentry for obj rename: %d\n", rc);
 763                 GOTO(out, rc = PTR_ERR(new_child));
 764         }
 765         if (new_child->d_inode == dentry->d_inode)
 766                 GOTO(out_dput, rc);
 767         if (new_child->d_inode != NULL) {
 768                 CERROR("impossible non-negative obj dentry "LPX64":%u!\n",
 769                        logid.lgl_oid, logid.lgl_ogen);
 770                 LBUG();
 771         }
 772         handle = llog_fsfilt_start(ctxt, ctxt->loc_objects_dir->d_inode,
 773                                    FSFILT_OP_LINK, NULL);
 774         if (IS_ERR(handle))
 775                 GOTO(out_dput, rc = PTR_ERR(handle));
 776
 777         lock_kernel();
 778         rc = vfs_link(dentry, ctxt->loc_objects_dir->d_inode, new_child);
 779         unlock_kernel();
 780         if (rc) {
 781                 CERROR("error link new object "LPX64":%08x: rc %d\n",
 782                        logid.lgl_oid, logid.lgl_ogen, rc);
 783                 /* it doesn't make much sense to get -EEXIST here */
 784                 LASSERTF(rc != -EEXIST, "bug 3490: dentry: %p "
 785                          "dir->d_ionode %p new_child: %p  \n",
 786                          dentry, ctxt->loc_objects_dir->d_inode, new_child);
 787         }
 788         err = llog_fsfilt_commit(ctxt, ctxt->loc_objects_dir->d_inode, handle, 0);
 789 out_dput:
 790         l_dput(new_child);
 791 out:
 792         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 793         RETURN(rc);
 794 }
 795
 796 static int llog_lvfs_open(struct llog_ctxt *ctxt, struct llog_handle **res,
 797                           struct llog_logid *logid, char *name, int flags)
 798 {
 799         struct llog_handle *handle;
 800         struct lvfs_run_ctxt saved;
 801         int rc = 0;
 802         int open_flags = O_RDWR | O_LARGEFILE;
 803         ENTRY;
 804
 805         if (flags & OBD_LLOG_FL_CREATE)
 806                 open_flags |= O_CREAT;
 807
 808         handle = llog_alloc_handle();
 809         if (handle == NULL)
 810                 RETURN(-ENOMEM);
 811         *res = handle;
 812
 813         LASSERT(ctxt);
 814         if (ctxt->loc_lvfs_ctxt)
 815                 push_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 816
 817         if (logid != NULL) {
 818                 handle->lgh_file = llog_object_create(ctxt, logid);
 819                 if (IS_ERR(handle->lgh_file)) {
 820                         CERROR("cannot create/open llog object "LPX64":%x "
 821                                "error = %ld", logid->lgl_oid, logid->lgl_ogen,
 822                                PTR_ERR(handle->lgh_file));
 823                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 824                 }
 825                 handle->lgh_id = *logid;
 826
 827         } else if (name) {
 828                 handle->lgh_file = llog_filp_open(name, open_flags, 0644);
 829                 if (IS_ERR(handle->lgh_file)) {
 830                         CERROR("cannot open %s file, error = %ld\n",
 831                                name, PTR_ERR(handle->lgh_file));
 832                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 833                 }
 834                 LASSERT(handle->lgh_file->f_dentry->d_parent == ctxt->loc_logs_dir);
 835
 836                 handle->lgh_id.lgl_ogr = 1;
 837                 handle->lgh_id.lgl_oid = handle->lgh_file->f_dentry->d_inode->i_ino;
 838                 handle->lgh_id.lgl_ogen = handle->lgh_file->f_dentry->d_inode->i_generation;
 839                 rc = llog_add_link_object(ctxt, handle->lgh_id, handle->lgh_file->f_dentry);
 840                 if (rc)
 841                         GOTO(cleanup, rc);
 842
 843         } else {
 844                 handle->lgh_file = llog_object_create(ctxt, &handle->lgh_id);
 845                 if (IS_ERR(handle->lgh_file)) {
 846                         CERROR("cannot create llog object, error = %ld\n",
 847                                PTR_ERR(handle->lgh_file));
 848                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 849                 }
 850         }
 851
 852         handle->lgh_ctxt = ctxt;
 853 finish:
 854         if (ctxt->loc_lvfs_ctxt)
 855                 pop_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 856         RETURN(rc);
 857 cleanup:
 858         llog_free_handle(handle);
 859         goto finish;
 860 }
 861
 862 static int llog_lvfs_close(struct llog_handle *handle)
 863 {
 864         int rc;
 865         ENTRY;
 866
 867         rc = filp_close(handle->lgh_file, 0);
 868         if (rc)
 869                 CERROR("error closing log: rc %d\n", rc);
 870         RETURN(rc);
 871 }
 872
 873 static int llog_lvfs_destroy(struct llog_handle *loghandle)
 874 {
 875         struct llog_ctxt *ctxt = loghandle->lgh_ctxt;
 876         struct lvfs_run_ctxt saved;
 877         struct dentry *fdentry;
 878         struct inode *parent_inode;
 879         char id_name[LL_ID_NAMELEN];
 880         void *handle;
 881         int rc = -EINVAL, err, id_len;
 882         ENTRY;
 883
 884         if (ctxt->loc_lvfs_ctxt)
 885                 push_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 886
 887         fdentry = loghandle->lgh_file->f_dentry;
 888         parent_inode = fdentry->d_parent->d_inode;
 889
 890         if (!strcmp((char *)fdentry->d_parent->d_name.name, "LOGS")) {
 891                 LASSERT(parent_inode == ctxt->loc_logs_dir->d_inode);
 892
 893                 id_len = ll_id2str(id_name, fdentry->d_inode->i_ino,
 894                                    fdentry->d_inode->i_generation);
 895                 dget(fdentry);
 896                 rc = llog_lvfs_close(loghandle);
 897                 if (rc) {
 898                         dput(fdentry);
 899                         GOTO(out, rc);
 900                 }
 901
 902                 handle = llog_fsfilt_start(ctxt, parent_inode,
 903                                            FSFILT_OP_UNLINK, NULL);
 904                 if (IS_ERR(handle)) {
 905                         dput(fdentry);
 906                         GOTO(out, rc = PTR_ERR(handle));
 907                 }
 908
 909                 down(&parent_inode->i_sem);
 910                 rc = vfs_unlink(parent_inode, fdentry);
 911                 up(&parent_inode->i_sem);
 912                 dput(fdentry);
 913
 914                 if (!rc) {
 915                         down(&ctxt->loc_objects_dir->d_inode->i_sem);
 916                         fdentry = lookup_one_len(id_name, ctxt->loc_objects_dir,
 917                                                  id_len);
 918                         if (fdentry == NULL || fdentry->d_inode == NULL) {
 919                                 CERROR("destroy non_existent object %s\n",
 920                                        id_name);
 921                                 GOTO(out_err, rc = IS_ERR(fdentry) ?
 922                                      PTR_ERR(fdentry) : -ENOENT);
 923                         }
 924                         rc = vfs_unlink(ctxt->loc_objects_dir->d_inode, fdentry);
 925                         l_dput(fdentry);
 926 out_err:
 927                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 928                 }
 929                 err = llog_fsfilt_commit(ctxt, parent_inode, handle, 0);
 930                 if (err && !rc)
 931                         err = rc;
 932
 933                 GOTO(out, rc);
 934         }
 935         if (ctxt->loc_alone) {
 936                 if (!strcmp((char *)fdentry->d_parent->d_name.name, "OBJECTS")) {
 937                         LASSERT(parent_inode == ctxt->loc_objects_dir->d_inode);
 938
 939                         dget(fdentry);
 940                         rc = llog_lvfs_close(loghandle);
 941                         if (rc == 0) {
 942                                 down(&parent_inode->i_sem);
 943                                 rc = vfs_unlink(parent_inode, fdentry);
 944                                 up(&parent_inode->i_sem);
 945                         }
 946                         dput(fdentry);
 947                 }
 948         } else {
 949                 struct obdo *oa = NULL;
 950
 951                 OBD_ALLOC(oa, sizeof(*oa));
 952                 if (!oa)
 953                         GOTO(out, rc = -ENOMEM);
 954
 955                 oa->o_id = loghandle->lgh_id.lgl_oid;
 956                 oa->o_gr = loghandle->lgh_id.lgl_ogr;
 957                 oa->o_generation = loghandle->lgh_id.lgl_ogen;
 958                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 959
 960                 rc = llog_lvfs_close(loghandle);
 961                 if (rc)
 962                         GOTO(out_free_oa, rc);
 963
 964                 rc = obd_destroy(loghandle->lgh_ctxt->loc_exp, oa, NULL, NULL);
 965 out_free_oa:
 966                 OBD_FREE(oa, sizeof(*oa));
 967         }
 968 out:
 969         if (ctxt->loc_lvfs_ctxt)
 970                 pop_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 971         RETURN(rc);
 972 }
 973
 974 /* reads the catalog list */
 975 int llog_get_cat_list(struct lvfs_run_ctxt *ctxt,
 976                       struct fsfilt_operations *fsops, const char *name,
 977                       int count, struct llog_catid *idarray)
 978 {
 979         struct lvfs_run_ctxt saved;
 980         struct l_file *file;
 981         int size = sizeof(*idarray) * count;
 982         loff_t off = 0;
 983         int rc;
 984
 985         LASSERT(count);
 986
 987         if (ctxt)
 988                 push_ctxt(&saved, ctxt, NULL);
 989         file = l_filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 990         if (!file || IS_ERR(file)) {
 991                 rc = PTR_ERR(file);
 992                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 993                        name, rc);
 994                 GOTO(out, rc);
 995         }
 996
 997         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 998                 CERROR("%s is not a regular file!: mode = %o\n", name,
 999                        file->f_dentry->d_inode->i_mode);
1000                 GOTO(out, rc = -ENOENT);
1001         }
1002
1003         rc = fsops->fs_read_record(file, idarray, size, &off);
1004         if (rc) {
1005                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
1006                        name, rc);
1007                 GOTO(out, rc);
1008         }
1009
1010  out:
1011         if (file && !IS_ERR(file))
1012                 rc = filp_close(file, 0);
1013         if (ctxt)
1014                 pop_ctxt(&saved, ctxt, NULL);
1015         RETURN(rc);
1016 }
1017 EXPORT_SYMBOL(llog_get_cat_list);
1018
1019 /* writes the cat list */
1020 int llog_put_cat_list(struct lvfs_run_ctxt *ctxt,
1021                       struct fsfilt_operations *fsops, const char *name,
1022                       int count, struct llog_catid *idarray)
1023 {
1024         struct lvfs_run_ctxt saved;
1025         struct l_file *file;
1026         int size = sizeof(*idarray) * count;
1027         loff_t off = 0;
1028         int rc;
1029
1030         LASSERT(count);
1031
1032         if (ctxt)
1033                 push_ctxt(&saved, ctxt, NULL);
1034         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
1035         if (!file || IS_ERR(file)) {
1036                 rc = PTR_ERR(file);
1037                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
1038                        name, rc);
1039                 GOTO(out, rc);
1040         }
1041
1042         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
1043                 CERROR("%s is not a regular file!: mode = %o\n", name,
1044                        file->f_dentry->d_inode->i_mode);
1045                 GOTO(out, rc = -ENOENT);
1046         }
1047
1048         rc = fsops->fs_write_record(file, idarray, size, &off, 1);
1049         if (rc) {
1050                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
1051                        name, rc);
1052                 GOTO(out, rc);
1053         }
1054
1055  out:
1056         if (file && !IS_ERR(file))
1057                 rc = filp_close(file, 0);
1058         if (ctxt)
1059                 pop_ctxt(&saved, ctxt, NULL);
1060         RETURN(rc);
1061 }
1062 EXPORT_SYMBOL(llog_put_cat_list);
1063
1064 struct llog_operations llog_lvfs_ops = {
1065         lop_open:        llog_lvfs_open,
1066         lop_destroy:     llog_lvfs_destroy,
1067         lop_close:       llog_lvfs_close,
1068         lop_read_header: llog_lvfs_read_header,
1069         lop_write_rec:   llog_lvfs_write_rec,
1070         lop_next_block:  llog_lvfs_next_block,
1071         lop_prev_block:  llog_lvfs_prev_block,
1072 };
1073 EXPORT_SYMBOL(llog_lvfs_ops);
1074
1075 #else /* !__KERNEL__ */
1076
1077 static int llog_lvfs_read_header(struct llog_handle *handle)
1078 {
1079         LBUG();
1080         return 0;
1081 }
1082
1083 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
1084                                struct llog_rec_hdr *rec,
1085                                struct llog_cookie *reccookie, int cookiecount,
1086                                void *buf, int idx)
1087 {
1088         LBUG();
1089         return 0;
1090 }
1091
1092 static int llog_lvfs_open(struct llog_ctxt *ctxt, struct llog_handle **res,
1093                           struct llog_logid *logid, char *name, int flags)
1094 {
1095         LBUG();
1096         return 0;
1097 }
1098
1099 static int llog_lvfs_close(struct llog_handle *handle)
1100 {
1101         LBUG();
1102         return 0;
1103 }
1104
1105 static int llog_lvfs_destroy(struct llog_handle *handle)
1106 {
1107         LBUG();
1108         return 0;
1109 }
1110
1111 int llog_get_cat_list(struct lvfs_run_ctxt *ctxt,
1112                       struct fsfilt_operations *fsops, const char *name,
1113                       int count, struct llog_catid *idarray)
1114 {
1115         LBUG();
1116         return 0;
1117 }
1118
1119 int llog_put_cat_list(struct lvfs_run_ctxt *ctxt,
1120                       struct fsfilt_operations *fsops, const char *name,
1121                       int count, struct llog_catid *idarray)
1122 {
1123         LBUG();
1124         return 0;
1125 }
1126
1127 int llog_lvfs_prev_block(struct llog_handle *loghandle,
1128                          int prev_idx, void *buf, int len)
1129 {
1130         LBUG();
1131         return 0;
1132 }
1133
1134 int llog_lvfs_next_block(struct llog_handle *loghandle, int *curr_idx,
1135                          int next_idx, __u64 *offset, void *buf, int len)
1136 {
1137         LBUG();
1138         return 0;
1139 }
1140
1141 struct llog_operations llog_lvfs_ops = {
1142         lop_open:        llog_lvfs_open,
1143         lop_destroy:     llog_lvfs_destroy,
1144         lop_close:       llog_lvfs_close,
1145         lop_read_header: llog_lvfs_read_header,
1146         lop_write_rec:   llog_lvfs_write_rec,
1147         lop_next_block:  llog_lvfs_next_block,
1148         lop_prev_block:  llog_lvfs_prev_block,
1149 };
1150 #endif