lustre/obdclass/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/obd.h>
  42 #include <linux/obd_class.h>
  43 #include <linux/lustre_log.h>
  44 #include <linux/obd_ost.h>
  45 #include <libcfs/list.h>
  46 #include <linux/lvfs.h>
  47 #include <linux/lustre_fsfilt.h>
  48 #include "llog_internal.h"
  49
  50 #ifdef __KERNEL__
  51
  52 static int llog_lvfs_pad(struct obd_device *obd, struct l_file *file,
  53                                 int len, int index)
  54 {
  55         struct llog_rec_hdr rec = { 0 };
  56         struct llog_rec_tail tail;
  57         int rc;
  58         ENTRY;
  59
  60         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
  61
  62         tail.lrt_len = rec.lrh_len = len;
  63         tail.lrt_index = rec.lrh_index = index;
  64         rec.lrh_type = LLOG_PAD_MAGIC;
  65
  66         rc = fsfilt_write_record(obd, file, &rec, sizeof(rec), &file->f_pos, 0);
  67         if (rc) {
  68                 CERROR("error writing padding record: rc %d\n", rc);
  69                 goto out;
  70         }
  71
  72         file->f_pos += len - sizeof(rec) - sizeof(tail);
  73         rc = fsfilt_write_record(obd, file, &tail, sizeof(tail),&file->f_pos,0);
  74         if (rc) {
  75                 CERROR("error writing padding record: rc %d\n", rc);
  76                 goto out;
  77         }
  78
  79  out:
  80         RETURN(rc);
  81 }
  82
  83 static int llog_lvfs_write_blob(struct obd_device *obd, struct l_file *file,
  84                                 struct llog_rec_hdr *rec, void *buf, loff_t off)
  85 {
  86         int rc;
  87         struct llog_rec_tail end;
  88         loff_t saved_off = file->f_pos;
  89         int buflen = rec->lrh_len;
  90
  91         ENTRY;
  92         file->f_pos = off;
  93
  94         if (!buf) {
  95                 rc = fsfilt_write_record(obd, file, rec, buflen,&file->f_pos,0);
  96                 if (rc) {
  97                         CERROR("error writing log record: rc %d\n", rc);
  98                         goto out;
  99                 }
 100                 GOTO(out, rc = 0);
 101         }
 102
 103         /* the buf case */
 104         rec->lrh_len = sizeof(*rec) + buflen + sizeof(end);
 105         rc = fsfilt_write_record(obd, file, rec, sizeof(*rec), &file->f_pos, 0);
 106         if (rc) {
 107                 CERROR("error writing log hdr: rc %d\n", rc);
 108                 goto out;
 109         }
 110
 111         rc = fsfilt_write_record(obd, file, buf, buflen, &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 = fsfilt_write_record(obd, file, &end, sizeof(end), &file->f_pos, 0);
 120         if (rc) {
 121                 CERROR("error writing log tail: rc %d\n", rc);
 122                 goto out;
 123         }
 124
 125         rc = 0;
 126  out:
 127         if (saved_off > file->f_pos)
 128                 file->f_pos = saved_off;
 129         LASSERT(rc <= 0);
 130         RETURN(rc);
 131 }
 132
 133 static int llog_lvfs_read_blob(struct obd_device *obd, struct l_file *file,
 134                                 void *buf, int size, loff_t off)
 135 {
 136         loff_t offset = off;
 137         int rc;
 138         ENTRY;
 139
 140         rc = fsfilt_read_record(obd, file, buf, size, &offset);
 141         if (rc) {
 142                 CERROR("error reading log record: rc %d\n", rc);
 143                 RETURN(rc);
 144         }
 145         RETURN(0);
 146 }
 147
 148 static int llog_lvfs_read_header(struct llog_handle *handle)
 149 {
 150         struct obd_device *obd;
 151         int rc;
 152         ENTRY;
 153
 154         LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
 155
 156         obd = handle->lgh_ctxt->loc_exp->exp_obd;
 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(obd, handle->lgh_file, handle->lgh_hdr,
 164                                  LLOG_CHUNK_SIZE, 0);
 165         if (rc) {
 166                 CERROR("error reading log header from %.*s\n",
 167                        handle->lgh_file->f_dentry->d_name.len,
 168                        handle->lgh_file->f_dentry->d_name.name);
 169         } else {
 170                 struct llog_rec_hdr *llh_hdr = &handle->lgh_hdr->llh_hdr;
 171
 172                 if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
 173                         lustre_swab_llog_hdr(handle->lgh_hdr);
 174
 175                 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 176                         CERROR("bad log %.*s header magic: %#x (expected %#x)\n",
 177                                handle->lgh_file->f_dentry->d_name.len,
 178                                handle->lgh_file->f_dentry->d_name.name,
 179                                llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 180                         rc = -EIO;
 181                 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 182                         CERROR("incorrectly sized log %.*s header: %#x "
 183                                "(expected %#x)\n",
 184                                handle->lgh_file->f_dentry->d_name.len,
 185                                handle->lgh_file->f_dentry->d_name.name,
 186                                llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 187                         CERROR("you may need to re-run lconf --write_conf.\n");
 188                         rc = -EIO;
 189                 }
 190         }
 191
 192         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 193         handle->lgh_file->f_pos = handle->lgh_file->f_dentry->d_inode->i_size;
 194
 195         RETURN(rc);
 196 }
 197
 198 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 199 /* appends if idx == -1, otherwise overwrites record idx. */
 200 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 201                                struct llog_rec_hdr *rec,
 202                                struct llog_cookie *reccookie, int cookiecount,
 203                                void *buf, int idx)
 204 {
 205         struct llog_log_hdr *llh;
 206         int reclen = rec->lrh_len, index, rc;
 207         struct llog_rec_tail *lrt;
 208         struct obd_device *obd;
 209         struct file *file;
 210         size_t left;
 211         ENTRY;
 212
 213         llh = loghandle->lgh_hdr;
 214         file = loghandle->lgh_file;
 215         obd = loghandle->lgh_ctxt->loc_exp->exp_obd;
 216
 217         /* record length should not bigger than LLOG_CHUNK_SIZE */
 218         if (buf)
 219                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
 220                       sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 221         else
 222                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 223         if (rc)
 224                 RETURN(rc);
 225
 226         if (idx != -1) {
 227                 loff_t saved_offset;
 228
 229                 /* no header: only allowed to insert record 1 */
 230                 if (idx != 1 && !file->f_dentry->d_inode->i_size) {
 231                         CERROR("idx != -1 in empty log\n");
 232                         LBUG();
 233                 }
 234
 235                 if (idx && llh->llh_size && llh->llh_size != reclen)
 236                         RETURN(-EINVAL);
 237
 238                 rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 239                 /* we are done if we only write the header or on error */
 240                 if (rc || idx == 0)
 241                         RETURN(rc);
 242
 243                 saved_offset = sizeof(*llh) + (idx-1)*rec->lrh_len;
 244                 rc = llog_lvfs_write_blob(obd, file, rec, buf, saved_offset);
 245                 if (rc == 0 && reccookie) {
 246                         reccookie->lgc_lgl = loghandle->lgh_id;
 247                         reccookie->lgc_index = idx;
 248                         rc = 1;
 249                 }
 250                 RETURN(rc);
 251         }
 252
 253         /* Make sure that records don't cross a chunk boundary, so we can
 254          * process them page-at-a-time if needed.  If it will cross a chunk
 255          * boundary, write in a fake (but referenced) entry to pad the chunk.
 256          *
 257          * We know that llog_current_log() will return a loghandle that is
 258          * big enough to hold reclen, so all we care about is padding here.
 259          */
 260         left = LLOG_CHUNK_SIZE - (file->f_pos & (LLOG_CHUNK_SIZE - 1));
 261         if (buf)
 262                 reclen = sizeof(*rec) + rec->lrh_len +
 263                         sizeof(struct llog_rec_tail);
 264
 265         /* NOTE: padding is a record, but no bit is set */
 266         if (left != 0 && left != reclen &&
 267             left < (reclen + LLOG_MIN_REC_SIZE)) {
 268                 loghandle->lgh_last_idx++;
 269                 rc = llog_lvfs_pad(obd, file, left, loghandle->lgh_last_idx);
 270                 if (rc)
 271                         RETURN(rc);
 272                 /* if it's the last idx in log file, then return -ENOSPC */
 273                 if (loghandle->lgh_last_idx == LLOG_BITMAP_SIZE(llh) - 1)
 274                         RETURN(-ENOSPC);
 275         }
 276
 277         loghandle->lgh_last_idx++;
 278         index = loghandle->lgh_last_idx;
 279         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 280         rec->lrh_index = index;
 281         if (buf == NULL) {
 282                 lrt = (struct llog_rec_tail *)
 283                         ((char *)rec + rec->lrh_len - sizeof(*lrt));
 284                 lrt->lrt_len = rec->lrh_len;
 285                 lrt->lrt_index = rec->lrh_index;
 286         }
 287         if (ext2_set_bit(index, llh->llh_bitmap)) {
 288                 CERROR("argh, index %u already set in log bitmap?\n", index);
 289                 LBUG(); /* should never happen */
 290         }
 291         llh->llh_count++;
 292         llh->llh_tail.lrt_index = index;
 293
 294         rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 295         if (rc)
 296                 RETURN(rc);
 297
 298         rc = llog_lvfs_write_blob(obd, file, rec, buf, file->f_pos);
 299         if (rc)
 300                 RETURN(rc);
 301
 302         CDEBUG(D_HA, "added record "LPX64": idx: %u, %u bytes\n",
 303                loghandle->lgh_id.lgl_oid, index, rec->lrh_len);
 304         if (rc == 0 && reccookie) {
 305                 reccookie->lgc_lgl = loghandle->lgh_id;
 306                 reccookie->lgc_index = index;
 307                 if (rec->lrh_type == MDS_UNLINK_REC)
 308                         reccookie->lgc_subsys = LLOG_UNLINK_ORIG_CTXT;
 309                 else if (rec->lrh_type == OST_SZ_REC)
 310                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 311                 else if (rec->lrh_type == OST_RAID1_REC)
 312                         reccookie->lgc_subsys = LLOG_RD1_ORIG_CTXT;
 313                 else
 314                         reccookie->lgc_subsys = -1;
 315                 rc = 1;
 316         }
 317         if (rc == 0 && rec->lrh_type == LLOG_GEN_REC)
 318                 rc = 1;
 319
 320         RETURN(rc);
 321 }
 322
 323 /* We can skip reading at least as many log blocks as the number of
 324 * minimum sized log records we are skipping.  If it turns out
 325 * that we are not far enough along the log (because the
 326 * actual records are larger than minimum size) we just skip
 327 * some more records. */
 328
 329 static void llog_skip_over(__u64 *off, int curr, int goal)
 330 {
 331         if (goal <= curr)
 332                 return;
 333         *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
 334                 ~(LLOG_CHUNK_SIZE - 1);
 335 }
 336
 337
 338 /* sets:
 339  *  - cur_offset to the furthest point read in the log file
 340  *  - cur_idx to the log index preceeding cur_offset
 341  * returns -EIO/-EINVAL on error
 342  */
 343 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 344                                 int next_idx, __u64 *cur_offset, void *buf,
 345                                 int len)
 346 {
 347         int rc;
 348         ENTRY;
 349
 350         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 351                 RETURN(-EINVAL);
 352
 353         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 354                next_idx, *cur_idx, *cur_offset);
 355
 356         while (*cur_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 357                 struct llog_rec_hdr *rec;
 358                 struct llog_rec_tail *tail;
 359                 loff_t ppos;
 360
 361                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 362
 363                 ppos = *cur_offset;
 364                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 365                                         loghandle->lgh_file, buf, len,
 366                                         &ppos);
 367
 368                 if (rc) {
 369                         CERROR("Cant read llog block at log id "LPU64
 370                                "/%u offset "LPU64"\n",
 371                                loghandle->lgh_id.lgl_oid,
 372                                loghandle->lgh_id.lgl_ogen,
 373                                *cur_offset);
 374                         RETURN(rc);
 375                 }
 376
 377                 /* put number of bytes read into rc to make code simpler */
 378                 rc = ppos - *cur_offset;
 379                 *cur_offset = ppos;
 380
 381                 if (rc == 0) /* end of file, nothing to do */
 382                         RETURN(0);
 383
 384                 if (rc < sizeof(*tail)) {
 385                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 386                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 387                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 388                         RETURN(-EINVAL);
 389                 }
 390
 391                 rec = buf;
 392                 tail = (struct llog_rec_tail *)((char *)buf + rc - sizeof(struct llog_rec_tail));
 393
 394                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec)) {
 395                         lustre_swab_llog_rec(rec, tail);
 396                 }
 397
 398                 *cur_idx = tail->lrt_index;
 399
 400                 /* this shouldn't happen */
 401                 if (tail->lrt_index == 0) {
 402                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 403                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 404                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 405                         RETURN(-EINVAL);
 406                 }
 407                 if (tail->lrt_index < next_idx)
 408                         continue;
 409
 410                 /* sanity check that the start of the new buffer is no farther
 411                  * than the record that we wanted.  This shouldn't happen. */
 412                 if (rec->lrh_index > next_idx) {
 413                         CERROR("missed desired record? %u > %u\n",
 414                                rec->lrh_index, next_idx);
 415                         RETURN(-ENOENT);
 416                 }
 417                 RETURN(0);
 418         }
 419         RETURN(-EIO);
 420 }
 421
 422 static struct file *llog_filp_open(char *name, int flags, int mode)
 423 {
 424         char *logname;
 425         struct file *filp;
 426         int len;
 427
 428         OBD_ALLOC(logname, PATH_MAX);
 429         if (logname == NULL)
 430                 return ERR_PTR(-ENOMEM);
 431
 432         len = snprintf(logname, PATH_MAX, "LOGS/%s", name);
 433         if (len >= PATH_MAX - 1) {
 434                 filp = ERR_PTR(-ENAMETOOLONG);
 435         } else {
 436                 filp = l_filp_open(logname, flags, mode);
 437                 if (IS_ERR(filp))
 438                         CERROR("logfile creation %s: %ld\n", logname,
 439                                PTR_ERR(filp));
 440         }
 441
 442         OBD_FREE(logname, PATH_MAX);
 443         return filp;
 444 }
 445
 446 /* This is a callback from the llog_* functions.
 447  * Assumes caller has already pushed us into the kernel context. */
 448 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 449                             struct llog_logid *logid, char *name)
 450 {
 451         struct llog_handle *handle;
 452         struct obd_device *obd;
 453         struct l_dentry *dchild = NULL;
 454         struct obdo *oa = NULL;
 455         int rc = 0, cleanup_phase = 1;
 456         int open_flags = O_RDWR | O_CREAT | O_LARGEFILE;
 457         ENTRY;
 458
 459         handle = llog_alloc_handle();
 460         if (handle == NULL)
 461                 RETURN(-ENOMEM);
 462         *res = handle;
 463
 464         LASSERT(ctxt);
 465         LASSERT(ctxt->loc_exp);
 466         obd = ctxt->loc_exp->exp_obd;
 467
 468         if (logid != NULL) {
 469                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, logid->lgl_oid,
 470                                              logid->lgl_ogen, logid->lgl_ogr);
 471
 472                 if (IS_ERR(dchild)) {
 473                         rc = PTR_ERR(dchild);
 474                         CERROR("error looking up logfile "LPX64":0x%x: rc %d\n",
 475                                logid->lgl_oid, logid->lgl_ogen, rc);
 476                         GOTO(cleanup, rc);
 477                 }
 478
 479                 cleanup_phase = 2;
 480                 if (dchild->d_inode == NULL) {
 481                         rc = -ENOENT;
 482                         CERROR("nonexistent log file "LPX64":"LPX64": rc %d\n",
 483                                logid->lgl_oid, logid->lgl_ogr, rc);
 484                         GOTO(cleanup, rc);
 485                 }
 486
 487                 handle->lgh_file = l_dentry_open(&obd->obd_ctxt, dchild,
 488                                                     O_RDWR | O_LARGEFILE);
 489                 if (IS_ERR(handle->lgh_file)) {
 490                         rc = PTR_ERR(handle->lgh_file);
 491                         CERROR("error opening logfile "LPX64"0x%x: rc %d\n",
 492                                logid->lgl_oid, logid->lgl_ogen, rc);
 493                         GOTO(cleanup, rc);
 494                 }
 495
 496                 /* assign the value of lgh_id for handle directly */
 497                 handle->lgh_id = *logid;
 498
 499         } else if (name) {
 500                 handle->lgh_file = llog_filp_open(name, open_flags, 0644);
 501                 if (IS_ERR(handle->lgh_file))
 502                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 503
 504                 handle->lgh_id.lgl_ogr = 1;
 505                 handle->lgh_id.lgl_oid =
 506                         handle->lgh_file->f_dentry->d_inode->i_ino;
 507                 handle->lgh_id.lgl_ogen =
 508                         handle->lgh_file->f_dentry->d_inode->i_generation;
 509         } else {
 510                 oa = obdo_alloc();
 511                 if (oa == NULL)
 512                         GOTO(cleanup, rc = -ENOMEM);
 513                 /* XXX get some filter group constants */
 514                 oa->o_gr = 1;
 515                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 516                 rc = obd_create(ctxt->loc_exp, oa, NULL, NULL);
 517                 if (rc)
 518                         GOTO(cleanup, rc);
 519
 520                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, oa->o_id,
 521                                              oa->o_generation, oa->o_gr);
 522
 523                 if (IS_ERR(dchild))
 524                         GOTO(cleanup, rc = PTR_ERR(dchild));
 525                 cleanup_phase = 2;
 526                 handle->lgh_file = l_dentry_open(&obd->obd_ctxt, dchild,
 527                                                  open_flags);
 528                 if (IS_ERR(handle->lgh_file))
 529                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 530
 531                 handle->lgh_id.lgl_ogr = oa->o_gr;
 532                 handle->lgh_id.lgl_oid = oa->o_id;
 533                 handle->lgh_id.lgl_ogen = oa->o_generation;
 534         }
 535
 536         handle->lgh_ctxt = ctxt;
 537  finish:
 538         if (oa)
 539                 obdo_free(oa);
 540         RETURN(rc);
 541 cleanup:
 542         switch (cleanup_phase) {
 543         case 2:
 544                 l_dput(dchild);
 545         case 1:
 546                 llog_free_handle(handle);
 547         }
 548         goto finish;
 549 }
 550
 551 static int llog_lvfs_close(struct llog_handle *handle)
 552 {
 553         int rc;
 554         ENTRY;
 555
 556         rc = filp_close(handle->lgh_file, 0);
 557         if (rc)
 558                 CERROR("error closing log: rc %d\n", rc);
 559         RETURN(rc);
 560 }
 561
 562 static int llog_lvfs_destroy(struct llog_handle *handle)
 563 {
 564         struct dentry *fdentry;
 565         struct obdo *oa;
 566         int rc;
 567         ENTRY;
 568
 569         fdentry = handle->lgh_file->f_dentry;
 570         if (!strcmp(fdentry->d_parent->d_name.name, "LOGS")) {
 571                 struct obd_device *obd = handle->lgh_ctxt->loc_exp->exp_obd;
 572                 struct inode *inode = fdentry->d_parent->d_inode;
 573                 struct obd_run_ctxt saved;
 574
 575                 push_ctxt(&saved, &obd->obd_ctxt, NULL);
 576                 dget(fdentry);
 577                 rc = llog_lvfs_close(handle);
 578
 579                 if (rc == 0) {
 580                         down(&inode->i_sem);
 581                         rc = vfs_unlink(inode, fdentry);
 582                         up(&inode->i_sem);
 583                 }
 584
 585                 dput(fdentry);
 586                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 587                 RETURN(rc);
 588         }
 589
 590         oa = obdo_alloc();
 591         if (oa == NULL)
 592                 RETURN(-ENOMEM);
 593
 594         oa->o_id = handle->lgh_id.lgl_oid;
 595         oa->o_gr = handle->lgh_id.lgl_ogr;
 596         oa->o_generation = handle->lgh_id.lgl_ogen;
 597         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 598
 599         rc = llog_lvfs_close(handle);
 600         if (rc)
 601                 GOTO(out, rc);
 602
 603         rc = obd_destroy(handle->lgh_ctxt->loc_exp, oa, NULL, NULL);
 604  out:
 605         obdo_free(oa);
 606         RETURN(rc);
 607 }
 608
 609 /* reads the catalog list */
 610 int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 611                       char *name, int count, struct llog_catid *idarray)
 612 {
 613         struct obd_run_ctxt saved;
 614         struct l_file *file;
 615         int rc;
 616         int size = sizeof(*idarray) * count;
 617         loff_t off = 0;
 618
 619         LASSERT(count);
 620
 621         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 622         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 623         if (!file || IS_ERR(file)) {
 624                 rc = PTR_ERR(file);
 625                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 626                        name, rc);
 627                 GOTO(out, rc);
 628         }
 629
 630         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 631                 CERROR("%s is not a regular file!: mode = %o\n", name,
 632                        file->f_dentry->d_inode->i_mode);
 633                 GOTO(out, rc = -ENOENT);
 634         }
 635
 636         rc = fsfilt_read_record(disk_obd, file, idarray, size, &off);
 637         if (rc) {
 638                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 639                        name, rc);
 640                 GOTO(out, rc);
 641         }
 642
 643  out:
 644         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 645         if (file && !IS_ERR(file))
 646                 rc = filp_close(file, 0);
 647         RETURN(rc);
 648 }
 649 EXPORT_SYMBOL(llog_get_cat_list);
 650
 651 /* writes the cat list */
 652 int llog_put_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 653                       char *name, int count, struct llog_catid *idarray)
 654 {
 655         struct obd_run_ctxt saved;
 656         struct l_file *file;
 657         int rc;
 658         int size = sizeof(*idarray) * count;
 659         loff_t off = 0;
 660
 661         LASSERT(count);
 662
 663         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 664         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 665         if (!file || IS_ERR(file)) {
 666                 rc = PTR_ERR(file);
 667                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 668                        name, rc);
 669                 GOTO(out, rc);
 670         }
 671
 672         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 673                 CERROR("%s is not a regular file!: mode = %o\n", name,
 674                        file->f_dentry->d_inode->i_mode);
 675                 GOTO(out, rc = -ENOENT);
 676         }
 677
 678         rc = fsfilt_write_record(disk_obd, file, idarray, size, &off, 1);
 679         if (rc) {
 680                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 681                        name, rc);
 682                 GOTO(out, rc);
 683         }
 684
 685  out:
 686         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 687         if (file && !IS_ERR(file))
 688                 rc = filp_close(file, 0);
 689         RETURN(rc);
 690 }
 691
 692 struct llog_operations llog_lvfs_ops = {
 693         lop_write_rec:   llog_lvfs_write_rec,
 694         lop_next_block:  llog_lvfs_next_block,
 695         lop_read_header: llog_lvfs_read_header,
 696         lop_create:      llog_lvfs_create,
 697         lop_destroy:     llog_lvfs_destroy,
 698         lop_close:       llog_lvfs_close,
 699         //        lop_cancel: llog_lvfs_cancel,
 700 };
 701
 702 EXPORT_SYMBOL(llog_lvfs_ops);
 703
 704 #else /* !__KERNEL__ */
 705
 706 static int llog_lvfs_read_header(struct llog_handle *handle)
 707 {
 708         LBUG();
 709         return 0;
 710 }
 711
 712 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 713                                struct llog_rec_hdr *rec,
 714                                struct llog_cookie *reccookie, int cookiecount,
 715                                void *buf, int idx)
 716 {
 717         LBUG();
 718         return 0;
 719 }
 720
 721 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 722                                 int next_idx, __u64 *cur_offset, void *buf,
 723                                 int len)
 724 {
 725         LBUG();
 726         return 0;
 727 }
 728
 729 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 730                             struct llog_logid *logid, char *name)
 731 {
 732         LBUG();
 733         return 0;
 734 }
 735
 736 static int llog_lvfs_close(struct llog_handle *handle)
 737 {
 738         LBUG();
 739         return 0;
 740 }
 741
 742 static int llog_lvfs_destroy(struct llog_handle *handle)
 743 {
 744         LBUG();
 745         return 0;
 746 }
 747
 748 int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 749                       char *name, int count, struct llog_catid *idarray)
 750 {
 751         LBUG();
 752         return 0;
 753 }
 754
 755 int llog_put_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 756                       char *name, int count, struct llog_catid *idarray)
 757 {
 758         LBUG();
 759         return 0;
 760 }
 761
 762 struct llog_operations llog_lvfs_ops = {
 763         lop_write_rec:   llog_lvfs_write_rec,
 764         lop_next_block:  llog_lvfs_next_block,
 765         lop_read_header: llog_lvfs_read_header,
 766         lop_create:      llog_lvfs_create,
 767         lop_destroy:     llog_lvfs_destroy,
 768         lop_close:       llog_lvfs_close,
 769 //        lop_cancel:      llog_lvfs_cancel,
 770 };
 771 #endif