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                         memset(buf, 0, len);
 396                         continue;
 397                 }
 398
 399                 /* sanity check that the start of the new buffer is no farther
 400                  * than the record that we wanted.  This shouldn't happen. */
 401                 rec = buf;
 402                 if (le32_to_cpu(rec->lrh_index) > next_idx) {
 403                         CERROR("missed desired record? %u > %u\n",
 404                                le32_to_cpu(rec->lrh_index), next_idx);
 405                         RETURN(-ENOENT);
 406                 }
 407                 RETURN(0);
 408         }
 409         RETURN(-EIO);
 410 }
 411
 412 static int llog_lvfs_prev_block(struct llog_handle *loghandle,
 413                                 int prev_idx, void *buf, int len)
 414 {
 415         struct llog_ctxt *ctxt = loghandle->lgh_ctxt;
 416         __u64 curr_offset;
 417         int rc;
 418         ENTRY;
 419
 420         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 421                 RETURN(-EINVAL);
 422
 423         CDEBUG(D_OTHER, "looking for log index %u \n", prev_idx);
 424
 425         curr_offset = LLOG_CHUNK_SIZE;
 426         llog_skip_over(&curr_offset, 0, prev_idx);
 427
 428         while (curr_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 429                 struct llog_rec_hdr *rec;
 430                 struct llog_rec_tail *tail;
 431                 loff_t ppos;
 432
 433                 ppos = curr_offset;
 434                 rc = llog_fsfilt_read_record(ctxt, loghandle->lgh_file,
 435                                              buf, len, &ppos);
 436
 437                 if (rc) {
 438                         CERROR("Cant read llog block at log id "LPU64
 439                                "/%u offset "LPU64"\n",
 440                                loghandle->lgh_id.lgl_oid,
 441                                loghandle->lgh_id.lgl_ogen,
 442                                curr_offset);
 443                         RETURN(rc);
 444                 }
 445
 446                 /* put number of bytes read into rc to make code simpler */
 447                 rc = ppos - curr_offset;
 448                 curr_offset = ppos;
 449
 450                 if (rc == 0) /* end of file, nothing to do */
 451                         RETURN(0);
 452
 453                 if (rc < sizeof(*tail)) {
 454                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 455                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 456                                loghandle->lgh_id.lgl_ogen, curr_offset);
 457                         RETURN(-EINVAL);
 458                 }
 459
 460                 tail = buf + rc - sizeof(struct llog_rec_tail);
 461
 462                 /* this shouldn't happen */
 463                 if (tail->lrt_index == 0) {
 464                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 465                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 466                                loghandle->lgh_id.lgl_ogen, curr_offset);
 467                         RETURN(-EINVAL);
 468                 }
 469                 if (le32_to_cpu(tail->lrt_index) < prev_idx)
 470                         continue;
 471
 472                 /* sanity check that the start of the new buffer is no farther
 473                  * than the record that we wanted.  This shouldn't happen. */
 474                 rec = buf;
 475                 if (le32_to_cpu(rec->lrh_index) > prev_idx) {
 476                         CERROR("missed desired record? %u > %u\n",
 477                                le32_to_cpu(rec->lrh_index), prev_idx);
 478                         RETURN(-ENOENT);
 479                 }
 480                 RETURN(0);
 481         }
 482         RETURN(-EIO);
 483 }
 484
 485 static struct file *llog_filp_open(char *name, int flags, int mode)
 486 {
 487         char *logname;
 488         struct file *filp;
 489         int len;
 490
 491         OBD_ALLOC(logname, PATH_MAX);
 492         if (logname == NULL)
 493                 return ERR_PTR(-ENOMEM);
 494
 495         len = snprintf(logname, PATH_MAX, "LOGS/%s", name);
 496         if (len >= PATH_MAX - 1) {
 497                 filp = ERR_PTR(-ENAMETOOLONG);
 498         } else {
 499                 filp = l_filp_open(logname, flags, mode);
 500                 if (IS_ERR(filp)) {
 501                         CERROR("logfile %s(%s): %ld\n",
 502                                flags & O_CREAT ? "create" : "open", logname,
 503                                PTR_ERR(filp));
 504                 }
 505         }
 506
 507         OBD_FREE(logname, PATH_MAX);
 508         return filp;
 509 }
 510
 511 /* creates object for the case when we have no obd (smfs). */
 512 static struct file *
 513 llog_object_create_alone(struct llog_ctxt *ctxt, struct llog_logid *lgh_id)
 514 {
 515         struct file *filp;
 516         int rc = 0;
 517         ENTRY;
 518
 519         LASSERT(lgh_id != NULL);
 520         if (lgh_id->lgl_oid) {
 521                 struct dentry *dchild;
 522                 char id_name[LL_ID_NAMELEN];
 523                 int id_len = 0;
 524
 525                 down(&ctxt->loc_objects_dir->d_inode->i_sem);
 526                 id_len = ll_id2str(id_name, lgh_id->lgl_oid,
 527                                        lgh_id->lgl_ogen);
 528
 529                 dchild = lookup_one_len(id_name, ctxt->loc_objects_dir,
 530                                         id_len);
 531                 if (IS_ERR(dchild)) {
 532                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 533                         RETURN((struct file *)dchild);
 534                 }
 535                 if (dchild->d_inode == NULL) {
 536                         struct dentry_params dp;
 537                         struct inode *inode;
 538
 539                         dchild->d_fsdata = (void *) &dp;
 540                         dp.p_ptr = NULL;
 541                         dp.p_inum = lgh_id->lgl_oid;
 542                         rc = ll_vfs_create(ctxt->loc_objects_dir->d_inode,
 543                                            dchild, S_IFREG, NULL);
 544                         if (dchild->d_fsdata == (void *)(unsigned long)lgh_id->lgl_oid)
 545                                 dchild->d_fsdata = NULL;
 546                         if (rc) {
 547                                 CDEBUG(D_INODE, "err during create: %d\n", rc);
 548                                 dput(dchild);
 549                                 up(&ctxt->loc_objects_dir->d_inode->i_sem);
 550                                 RETURN(ERR_PTR(rc));
 551                         }
 552                         inode = dchild->d_inode;
 553                         LASSERT(inode->i_ino == lgh_id->lgl_oid);
 554                         inode->i_generation = lgh_id->lgl_ogen;
 555                         CDEBUG(D_HA, "recreated ino %lu with gen %u\n",
 556                                inode->i_ino, inode->i_generation);
 557                         mark_inode_dirty(inode);
 558                 }
 559
 560                 mntget(ctxt->loc_lvfs_ctxt->pwdmnt);
 561                 filp = dentry_open(dchild, ctxt->loc_lvfs_ctxt->pwdmnt,
 562                                     O_RDWR | O_LARGEFILE);
 563                 if (IS_ERR(filp)) {
 564                         dput(dchild);
 565                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 566                         RETURN(filp);
 567                 }
 568                 if (!S_ISREG(filp->f_dentry->d_inode->i_mode)) {
 569                         CERROR("%s is not a regular file!: mode = %o\n",
 570                                id_name, filp->f_dentry->d_inode->i_mode);
 571                         filp_close(filp, 0);
 572                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 573                         RETURN(ERR_PTR(-ENOENT));
 574                 }
 575
 576                 up(&ctxt->loc_objects_dir->d_inode->i_sem);
 577                 RETURN(filp);
 578
 579         } else {
 580                 unsigned int tmpname = ll_insecure_random_int();
 581                 char id_name[LL_ID_NAMELEN];
 582                 struct dentry *new_child, *parent;
 583                 int err, id_len;
 584                 void *handle;
 585
 586                 sprintf(id_name, "OBJECTS/%u", tmpname);
 587                 filp = filp_open(id_name, O_CREAT | O_EXCL, 0644);
 588                 if (IS_ERR(filp)) {
 589                         rc = PTR_ERR(filp);
 590                         if (rc == -EEXIST) {
 591                                 CERROR("impossible object name collision %u\n",
 592                                         tmpname);
 593                                 LBUG();
 594                         }
 595                         CERROR("error creating tmp object %u: rc %d\n", tmpname, rc);
 596                         RETURN(filp);
 597                 }
 598
 599                 id_len = ll_id2str(id_name, filp->f_dentry->d_inode->i_ino,
 600                                        filp->f_dentry->d_inode->i_generation);
 601                 parent = filp->f_dentry->d_parent;
 602                 down(&parent->d_inode->i_sem);
 603                 new_child = lookup_one_len(id_name, parent, id_len);
 604                 if (IS_ERR(new_child)) {
 605                         CERROR("getting neg dentry for obj rename: %d\n", rc);
 606                         GOTO(out_close, rc = PTR_ERR(new_child));
 607                 }
 608                 if (new_child->d_inode != NULL) {
 609                         CERROR("impossible non-negative obj dentry %lu:%u!\n",
 610                                 filp->f_dentry->d_inode->i_ino,
 611                                 filp->f_dentry->d_inode->i_generation);
 612                         LBUG();
 613                 }
 614
 615                 handle = llog_fsfilt_start(ctxt, parent->d_inode, FSFILT_OP_RENAME, NULL);
 616                 if (IS_ERR(handle))
 617                         GOTO(out_dput, rc = PTR_ERR(handle));
 618
 619                 lock_kernel();
 620                 rc = vfs_rename(parent->d_inode, filp->f_dentry,
 621                                 parent->d_inode, new_child);
 622                 unlock_kernel();
 623                 if (rc)
 624                         CERROR("error renaming new object %lu:%u: rc %d\n",
 625                                 filp->f_dentry->d_inode->i_ino,
 626                                 filp->f_dentry->d_inode->i_generation, rc);
 627
 628                 err = llog_fsfilt_commit(ctxt, parent->d_inode, handle, 0);
 629                 if (!rc)
 630                         rc = err;
 631
 632         out_dput:
 633                 dput(new_child);
 634         out_close:
 635                 up(&parent->d_inode->i_sem);
 636                 if (rc) {
 637                         filp_close(filp, 0);
 638                         filp = ERR_PTR(rc);
 639                 } else {
 640                         /* FIXME: is this group 1 is correct? */
 641                         lgh_id->lgl_ogr = 1;
 642                         lgh_id->lgl_oid = filp->f_dentry->d_inode->i_ino;
 643                         lgh_id->lgl_ogen = filp->f_dentry->d_inode->i_generation;
 644                 }
 645                 RETURN(filp);
 646         }
 647 }
 648
 649 /* creates object for generic case (obd exists) */
 650 static struct file *
 651 llog_object_create_generic(struct llog_ctxt *ctxt, struct llog_logid *lgh_id)
 652 {
 653         struct file *filp = NULL;
 654         struct dentry *dchild;
 655         struct obd_device *obd;
 656         struct obdo *oa = NULL;
 657         int open_flags = O_RDWR | O_LARGEFILE;
 658         int rc = 0;
 659         ENTRY;
 660
 661         obd = ctxt->loc_exp->exp_obd;
 662         LASSERT(obd != NULL);
 663
 664         if (lgh_id->lgl_oid) {
 665                 dchild = obd_lvfs_id2dentry(ctxt->loc_exp, lgh_id->lgl_oid,
 666                                             lgh_id->lgl_ogen, lgh_id->lgl_ogr);
 667                 if (IS_ERR(dchild) == -ENOENT) {
 668                         OBD_ALLOC(oa, sizeof(*oa));
 669                         if (!oa)
 670                                 RETURN(ERR_PTR(-ENOMEM));
 671
 672                         oa->o_id = lgh_id->lgl_oid;
 673                         oa->o_generation = lgh_id->lgl_ogen;
 674                         oa->o_gr = lgh_id->lgl_ogr;
 675                         oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 676                         rc = obd_create(ctxt->loc_exp, oa, NULL, 0, NULL, NULL);
 677                         if (rc) {
 678                                 CDEBUG(D_INODE, "err during create: %d\n", rc);
 679                                 GOTO(out_free_oa, rc);
 680                         }
 681                         CDEBUG(D_HA, "re-create log object "LPX64":0x%x:"LPX64"\n",
 682                                lgh_id->lgl_oid, lgh_id->lgl_ogen, lgh_id->lgl_ogr);
 683
 684                         dchild = obd_lvfs_id2dentry(ctxt->loc_exp, lgh_id->lgl_oid,
 685                                                     lgh_id->lgl_ogen, lgh_id->lgl_ogr);
 686                 } else if (IS_ERR(dchild)) {
 687                         CERROR("error looking up logfile "LPX64":0x%x: rc %d\n",
 688                                lgh_id->lgl_oid, lgh_id->lgl_ogen, rc);
 689                         RETURN((struct file *)dchild);
 690                 }
 691
 692                 filp = l_dentry_open(&obd->obd_lvfs_ctxt, dchild, open_flags);
 693                 if (IS_ERR(filp)) {
 694                         l_dput(dchild);
 695                         rc = PTR_ERR(filp);
 696                         CERROR("error opening logfile "LPX64"0x%x: rc %d\n",
 697                                lgh_id->lgl_oid, lgh_id->lgl_ogen, rc);
 698                 }
 699                 GOTO(out_free_oa, rc);
 700         } else {
 701                 /* this is important to work here over obd_create() as it manages
 702                   groups and we need it. Yet another reason is that mds_obd_create()
 703                  is fully the same as old version of this function and this helps
 704                  us to avoid code duplicating and layering violating. */
 705                 OBD_ALLOC(oa, sizeof(*oa));
 706                 if (!oa)
 707                         RETURN(ERR_PTR(-ENOMEM));
 708
 709                 oa->o_gr = FILTER_GROUP_LLOG;
 710                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 711                 rc = obd_create(ctxt->loc_exp, oa, NULL, 0, NULL, NULL);
 712                 if (rc)
 713                         GOTO(out_free_oa, rc);
 714
 715                 dchild = obd_lvfs_id2dentry(ctxt->loc_exp, oa->o_id,
 716                                             oa->o_generation, oa->o_gr);
 717                 if (IS_ERR(dchild))
 718                         GOTO(out_free_oa, rc = PTR_ERR(dchild));
 719
 720                 filp = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 721                                      open_flags);
 722                 if (IS_ERR(filp)) {
 723                         l_dput(dchild);
 724                         GOTO(out_free_oa, rc = PTR_ERR(filp));
 725                 }
 726
 727                 /* group 1 is not longer valid, we use the group which is set
 728                 by obd_create()->mds_obd_create(). */
 729                 lgh_id->lgl_ogr = oa->o_gr;
 730                 lgh_id->lgl_oid = oa->o_id;
 731                 lgh_id->lgl_ogen = oa->o_generation;
 732         }
 733
 734 out_free_oa:
 735         if (rc)
 736                 filp = ERR_PTR(rc);
 737         if (oa)
 738                 OBD_FREE(oa, sizeof(*oa));
 739         RETURN(filp);
 740 }
 741
 742 static struct file *
 743 llog_object_create(struct llog_ctxt *ctxt, struct llog_logid *lgh_id)
 744 {
 745         if (ctxt->loc_alone)
 746                 return llog_object_create_alone(ctxt, lgh_id);
 747         else
 748                 return llog_object_create_generic(ctxt, lgh_id);
 749 }
 750
 751 static int llog_add_link_object(struct llog_ctxt *ctxt, struct llog_logid logid,
 752                                 struct dentry *dentry)
 753 {
 754         struct dentry *new_child;
 755         char id_name[LL_ID_NAMELEN];
 756         void *handle;
 757         int id_len, rc = 0, err;
 758         ENTRY;
 759
 760         id_len = ll_id2str(id_name, logid.lgl_oid, logid.lgl_ogen);
 761         down(&ctxt->loc_objects_dir->d_inode->i_sem);
 762         new_child = lookup_one_len(id_name, ctxt->loc_objects_dir, id_len);
 763         if (IS_ERR(new_child)) {
 764                 CERROR("getting neg dentry for obj rename: %d\n", rc);
 765                 GOTO(out, rc = PTR_ERR(new_child));
 766         }
 767         if (new_child->d_inode == dentry->d_inode)
 768                 GOTO(out_dput, rc);
 769         if (new_child->d_inode != NULL) {
 770                 CERROR("impossible non-negative obj dentry "LPX64":%u!\n",
 771                        logid.lgl_oid, logid.lgl_ogen);
 772                 LBUG();
 773         }
 774         handle = llog_fsfilt_start(ctxt, ctxt->loc_objects_dir->d_inode,
 775                                    FSFILT_OP_LINK, NULL);
 776         if (IS_ERR(handle))
 777                 GOTO(out_dput, rc = PTR_ERR(handle));
 778
 779         lock_kernel();
 780         rc = vfs_link(dentry, ctxt->loc_objects_dir->d_inode, new_child);
 781         unlock_kernel();
 782         if (rc) {
 783                 CERROR("error link new object "LPX64":%08x: rc %d\n",
 784                        logid.lgl_oid, logid.lgl_ogen, rc);
 785                 /* it doesn't make much sense to get -EEXIST here */
 786                 LASSERTF(rc != -EEXIST, "bug 3490: dentry: %p "
 787                          "dir->d_ionode %p new_child: %p  \n",
 788                          dentry, ctxt->loc_objects_dir->d_inode, new_child);
 789         }
 790         err = llog_fsfilt_commit(ctxt, ctxt->loc_objects_dir->d_inode, handle, 0);
 791 out_dput:
 792         l_dput(new_child);
 793 out:
 794         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 795         RETURN(rc);
 796 }
 797
 798 static int llog_lvfs_open(struct llog_ctxt *ctxt, struct llog_handle **res,
 799                           struct llog_logid *logid, char *name, int flags)
 800 {
 801         struct llog_handle *handle;
 802         struct lvfs_run_ctxt saved;
 803         int rc = 0;
 804         int open_flags = O_RDWR | O_LARGEFILE;
 805         ENTRY;
 806
 807         if (flags & OBD_LLOG_FL_CREATE)
 808                 open_flags |= O_CREAT;
 809
 810         handle = llog_alloc_handle();
 811         if (handle == NULL)
 812                 RETURN(-ENOMEM);
 813         *res = handle;
 814
 815         LASSERT(ctxt);
 816         if (ctxt->loc_lvfs_ctxt)
 817                 push_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 818
 819         if (logid != NULL) {
 820                 handle->lgh_file = llog_object_create(ctxt, logid);
 821                 if (IS_ERR(handle->lgh_file)) {
 822                         CERROR("cannot create/open llog object "LPX64":%x "
 823                                "error = %ld", logid->lgl_oid, logid->lgl_ogen,
 824                                PTR_ERR(handle->lgh_file));
 825                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 826                 }
 827                 handle->lgh_id = *logid;
 828
 829         } else if (name) {
 830                 handle->lgh_file = llog_filp_open(name, open_flags, 0644);
 831                 if (IS_ERR(handle->lgh_file)) {
 832                         CERROR("cannot open %s file, error = %ld\n",
 833                                name, PTR_ERR(handle->lgh_file));
 834                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 835                 }
 836                 LASSERT(handle->lgh_file->f_dentry->d_parent == ctxt->loc_logs_dir);
 837
 838                 handle->lgh_id.lgl_ogr = 1;
 839                 handle->lgh_id.lgl_oid = handle->lgh_file->f_dentry->d_inode->i_ino;
 840                 handle->lgh_id.lgl_ogen = handle->lgh_file->f_dentry->d_inode->i_generation;
 841                 rc = llog_add_link_object(ctxt, handle->lgh_id, handle->lgh_file->f_dentry);
 842                 if (rc)
 843                         GOTO(cleanup, rc);
 844
 845         } else {
 846                 handle->lgh_file = llog_object_create(ctxt, &handle->lgh_id);
 847                 if (IS_ERR(handle->lgh_file)) {
 848                         CERROR("cannot create llog object, error = %ld\n",
 849                                PTR_ERR(handle->lgh_file));
 850                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 851                 }
 852         }
 853
 854         handle->lgh_ctxt = ctxt;
 855 finish:
 856         if (ctxt->loc_lvfs_ctxt)
 857                 pop_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 858         RETURN(rc);
 859 cleanup:
 860         llog_free_handle(handle);
 861         goto finish;
 862 }
 863
 864 static int llog_lvfs_close(struct llog_handle *handle)
 865 {
 866         int rc;
 867         ENTRY;
 868
 869         rc = filp_close(handle->lgh_file, 0);
 870         if (rc)
 871                 CERROR("error closing log: rc %d\n", rc);
 872         RETURN(rc);
 873 }
 874
 875 static int llog_lvfs_destroy(struct llog_handle *loghandle)
 876 {
 877         struct llog_ctxt *ctxt = loghandle->lgh_ctxt;
 878         struct lvfs_run_ctxt saved;
 879         struct dentry *fdentry;
 880         struct inode *parent_inode;
 881         char id_name[LL_ID_NAMELEN];
 882         void *handle;
 883         int rc = -EINVAL, err, id_len;
 884         ENTRY;
 885
 886         if (ctxt->loc_lvfs_ctxt)
 887                 push_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 888
 889         fdentry = loghandle->lgh_file->f_dentry;
 890         parent_inode = fdentry->d_parent->d_inode;
 891
 892         if (!strcmp((char *)fdentry->d_parent->d_name.name, "LOGS")) {
 893                 LASSERT(parent_inode == ctxt->loc_logs_dir->d_inode);
 894
 895                 id_len = ll_id2str(id_name, fdentry->d_inode->i_ino,
 896                                    fdentry->d_inode->i_generation);
 897                 dget(fdentry);
 898                 rc = llog_lvfs_close(loghandle);
 899                 if (rc) {
 900                         dput(fdentry);
 901                         GOTO(out, rc);
 902                 }
 903
 904                 handle = llog_fsfilt_start(ctxt, parent_inode,
 905                                            FSFILT_OP_UNLINK, NULL);
 906                 if (IS_ERR(handle)) {
 907                         dput(fdentry);
 908                         GOTO(out, rc = PTR_ERR(handle));
 909                 }
 910
 911                 down(&parent_inode->i_sem);
 912                 rc = vfs_unlink(parent_inode, fdentry);
 913                 up(&parent_inode->i_sem);
 914                 dput(fdentry);
 915
 916                 if (!rc) {
 917                         down(&ctxt->loc_objects_dir->d_inode->i_sem);
 918                         fdentry = lookup_one_len(id_name, ctxt->loc_objects_dir,
 919                                                  id_len);
 920                         if (IS_ERR(fdentry) || fdentry->d_inode == NULL) {
 921                                 CERROR("destroy non_existent object %s\n",
 922                                        id_name);
 923                                 GOTO(out_err, rc = IS_ERR(fdentry) ?
 924                                      PTR_ERR(fdentry) : -ENOENT);
 925                         }
 926                         rc = vfs_unlink(ctxt->loc_objects_dir->d_inode, fdentry);
 927                         l_dput(fdentry);
 928 out_err:
 929                         up(&ctxt->loc_objects_dir->d_inode->i_sem);
 930                 }
 931                 err = llog_fsfilt_commit(ctxt, parent_inode, handle, 0);
 932                 if (err && !rc)
 933                         err = rc;
 934
 935                 GOTO(out, rc);
 936         }
 937         if (ctxt->loc_alone) {
 938                 if (!strcmp((char *)fdentry->d_parent->d_name.name, "OBJECTS")) {
 939                         LASSERT(parent_inode == ctxt->loc_objects_dir->d_inode);
 940
 941                         dget(fdentry);
 942                         rc = llog_lvfs_close(loghandle);
 943                         if (rc == 0) {
 944                                 down(&parent_inode->i_sem);
 945                                 rc = vfs_unlink(parent_inode, fdentry);
 946                                 up(&parent_inode->i_sem);
 947                         }
 948                         dput(fdentry);
 949                 }
 950         } else {
 951                 struct obdo *oa = NULL;
 952
 953                 OBD_ALLOC(oa, sizeof(*oa));
 954                 if (!oa)
 955                         GOTO(out, rc = -ENOMEM);
 956
 957                 oa->o_id = loghandle->lgh_id.lgl_oid;
 958                 oa->o_gr = loghandle->lgh_id.lgl_ogr;
 959                 oa->o_generation = loghandle->lgh_id.lgl_ogen;
 960                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 961
 962                 rc = llog_lvfs_close(loghandle);
 963                 if (rc)
 964                         GOTO(out_free_oa, rc);
 965
 966                 rc = obd_destroy(loghandle->lgh_ctxt->loc_exp, oa, NULL, NULL);
 967 out_free_oa:
 968                 OBD_FREE(oa, sizeof(*oa));
 969         }
 970 out:
 971         if (ctxt->loc_lvfs_ctxt)
 972                 pop_ctxt(&saved, ctxt->loc_lvfs_ctxt, NULL);
 973         RETURN(rc);
 974 }
 975
 976 /* reads the catalog list */
 977 int llog_get_cat_list(struct lvfs_run_ctxt *ctxt,
 978                       struct fsfilt_operations *fsops, const char *name,
 979                       int count, struct llog_catid *idarray)
 980 {
 981         struct lvfs_run_ctxt saved;
 982         struct l_file *file;
 983         int size = sizeof(*idarray) * count;
 984         loff_t off = 0;
 985         int rc;
 986
 987         LASSERT(count);
 988
 989         if (ctxt)
 990                 push_ctxt(&saved, ctxt, NULL);
 991         file = l_filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 992         if (!file || IS_ERR(file)) {
 993                 rc = PTR_ERR(file);
 994                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 995                        name, rc);
 996                 GOTO(out, rc);
 997         }
 998
 999         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
1000                 CERROR("%s is not a regular file!: mode = %o\n", name,
1001                        file->f_dentry->d_inode->i_mode);
1002                 GOTO(out, rc = -ENOENT);
1003         }
1004
1005         rc = fsops->fs_read_record(file, idarray, size, &off);
1006         if (rc) {
1007                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
1008                        name, rc);
1009                 GOTO(out, rc);
1010         }
1011
1012  out:
1013         if (file && !IS_ERR(file))
1014                 rc = filp_close(file, 0);
1015         if (ctxt)
1016                 pop_ctxt(&saved, ctxt, NULL);
1017         RETURN(rc);
1018 }
1019 EXPORT_SYMBOL(llog_get_cat_list);
1020
1021 /* writes the cat list */
1022 int llog_put_cat_list(struct lvfs_run_ctxt *ctxt,
1023                       struct fsfilt_operations *fsops, const char *name,
1024                       int count, struct llog_catid *idarray)
1025 {
1026         struct lvfs_run_ctxt saved;
1027         struct l_file *file;
1028         int size = sizeof(*idarray) * count;
1029         loff_t off = 0;
1030         int rc;
1031
1032         LASSERT(count);
1033
1034         if (ctxt)
1035                 push_ctxt(&saved, ctxt, NULL);
1036         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
1037         if (!file || IS_ERR(file)) {
1038                 rc = PTR_ERR(file);
1039                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
1040                        name, rc);
1041                 GOTO(out, rc);
1042         }
1043
1044         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
1045                 CERROR("%s is not a regular file!: mode = %o\n", name,
1046                        file->f_dentry->d_inode->i_mode);
1047                 GOTO(out, rc = -ENOENT);
1048         }
1049
1050         rc = fsops->fs_write_record(file, idarray, size, &off, 1);
1051         if (rc) {
1052                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
1053                        name, rc);
1054                 GOTO(out, rc);
1055         }
1056
1057  out:
1058         if (file && !IS_ERR(file))
1059                 rc = filp_close(file, 0);
1060         if (ctxt)
1061                 pop_ctxt(&saved, ctxt, NULL);
1062         RETURN(rc);
1063 }
1064 EXPORT_SYMBOL(llog_put_cat_list);
1065
1066 struct llog_operations llog_lvfs_ops = {
1067         lop_open:        llog_lvfs_open,
1068         lop_destroy:     llog_lvfs_destroy,
1069         lop_close:       llog_lvfs_close,
1070         lop_read_header: llog_lvfs_read_header,
1071         lop_write_rec:   llog_lvfs_write_rec,
1072         lop_next_block:  llog_lvfs_next_block,
1073         lop_prev_block:  llog_lvfs_prev_block,
1074 };
1075 EXPORT_SYMBOL(llog_lvfs_ops);
1076
1077 #else /* !__KERNEL__ */
1078
1079 static int llog_lvfs_read_header(struct llog_handle *handle)
1080 {
1081         LBUG();
1082         return 0;
1083 }
1084
1085 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
1086                                struct llog_rec_hdr *rec,
1087                                struct llog_cookie *reccookie, int cookiecount,
1088                                void *buf, int idx)
1089 {
1090         LBUG();
1091         return 0;
1092 }
1093
1094 static int llog_lvfs_open(struct llog_ctxt *ctxt, struct llog_handle **res,
1095                           struct llog_logid *logid, char *name, int flags)
1096 {
1097         LBUG();
1098         return 0;
1099 }
1100
1101 static int llog_lvfs_close(struct llog_handle *handle)
1102 {
1103         LBUG();
1104         return 0;
1105 }
1106
1107 static int llog_lvfs_destroy(struct llog_handle *handle)
1108 {
1109         LBUG();
1110         return 0;
1111 }
1112
1113 int llog_get_cat_list(struct lvfs_run_ctxt *ctxt,
1114                       struct fsfilt_operations *fsops, const char *name,
1115                       int count, struct llog_catid *idarray)
1116 {
1117         LBUG();
1118         return 0;
1119 }
1120
1121 int llog_put_cat_list(struct lvfs_run_ctxt *ctxt,
1122                       struct fsfilt_operations *fsops, const char *name,
1123                       int count, struct llog_catid *idarray)
1124 {
1125         LBUG();
1126         return 0;
1127 }
1128
1129 int llog_lvfs_prev_block(struct llog_handle *loghandle,
1130                          int prev_idx, void *buf, int len)
1131 {
1132         LBUG();
1133         return 0;
1134 }
1135
1136 int llog_lvfs_next_block(struct llog_handle *loghandle, int *curr_idx,
1137                          int next_idx, __u64 *offset, void *buf, int len)
1138 {
1139         LBUG();
1140         return 0;
1141 }
1142
1143 struct llog_operations llog_lvfs_ops = {
1144         lop_open:        llog_lvfs_open,
1145         lop_destroy:     llog_lvfs_destroy,
1146         lop_close:       llog_lvfs_close,
1147         lop_read_header: llog_lvfs_read_header,
1148         lop_write_rec:   llog_lvfs_write_rec,
1149         lop_next_block:  llog_lvfs_next_block,
1150         lop_prev_block:  llog_lvfs_prev_block,
1151 };
1152 #endif