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                                 (rec->lrh_type == MDS_SETATTR_REC))
 309                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 310                 else if (rec->lrh_type == OST_SZ_REC)
 311                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 312                 else if (rec->lrh_type == OST_RAID1_REC)
 313                         reccookie->lgc_subsys = LLOG_RD1_ORIG_CTXT;
 314                 else
 315                         reccookie->lgc_subsys = -1;
 316                 rc = 1;
 317         }
 318         if (rc == 0 && rec->lrh_type == LLOG_GEN_REC)
 319                 rc = 1;
 320
 321         RETURN(rc);
 322 }
 323
 324 /* We can skip reading at least as many log blocks as the number of
 325 * minimum sized log records we are skipping.  If it turns out
 326 * that we are not far enough along the log (because the
 327 * actual records are larger than minimum size) we just skip
 328 * some more records. */
 329
 330 static void llog_skip_over(__u64 *off, int curr, int goal)
 331 {
 332         if (goal <= curr)
 333                 return;
 334         *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
 335                 ~(LLOG_CHUNK_SIZE - 1);
 336 }
 337
 338
 339 /* sets:
 340  *  - cur_offset to the furthest point read in the log file
 341  *  - cur_idx to the log index preceeding cur_offset
 342  * returns -EIO/-EINVAL on error
 343  */
 344 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 345                                 int next_idx, __u64 *cur_offset, void *buf,
 346                                 int len)
 347 {
 348         int rc;
 349         ENTRY;
 350
 351         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 352                 RETURN(-EINVAL);
 353
 354         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 355                next_idx, *cur_idx, *cur_offset);
 356
 357         while (*cur_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 358                 struct llog_rec_hdr *rec;
 359                 struct llog_rec_tail *tail;
 360                 loff_t ppos;
 361
 362                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 363
 364                 ppos = *cur_offset;
 365                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 366                                         loghandle->lgh_file, buf, len,
 367                                         &ppos);
 368
 369                 if (rc) {
 370                         CERROR("Cant read llog block at log id "LPU64
 371                                "/%u offset "LPU64"\n",
 372                                loghandle->lgh_id.lgl_oid,
 373                                loghandle->lgh_id.lgl_ogen,
 374                                *cur_offset);
 375                         RETURN(rc);
 376                 }
 377
 378                 /* put number of bytes read into rc to make code simpler */
 379                 rc = ppos - *cur_offset;
 380                 *cur_offset = ppos;
 381
 382                 if (rc == 0) /* end of file, nothing to do */
 383                         RETURN(0);
 384
 385                 if (rc < sizeof(*tail)) {
 386                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 387                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 388                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 389                         RETURN(-EINVAL);
 390                 }
 391
 392                 rec = buf;
 393                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 394                                                 sizeof(struct llog_rec_tail));
 395
 396                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec)) {
 397                         lustre_swab_llog_rec(rec, tail);
 398                 }
 399
 400                 *cur_idx = tail->lrt_index;
 401
 402                 /* this shouldn't happen */
 403                 if (tail->lrt_index == 0) {
 404                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 405                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 406                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 407                         RETURN(-EINVAL);
 408                 }
 409                 if (tail->lrt_index < next_idx)
 410                         continue;
 411
 412                 /* sanity check that the start of the new buffer is no farther
 413                  * than the record that we wanted.  This shouldn't happen. */
 414                 if (rec->lrh_index > next_idx) {
 415                         CERROR("missed desired record? %u > %u\n",
 416                                rec->lrh_index, next_idx);
 417                         RETURN(-ENOENT);
 418                 }
 419                 RETURN(0);
 420         }
 421         RETURN(-EIO);
 422 }
 423
 424 static struct file *llog_filp_open(char *name, int flags, int mode)
 425 {
 426         char *logname;
 427         struct file *filp;
 428         int len;
 429
 430         OBD_ALLOC(logname, PATH_MAX);
 431         if (logname == NULL)
 432                 return ERR_PTR(-ENOMEM);
 433
 434         len = snprintf(logname, PATH_MAX, "LOGS/%s", name);
 435         if (len >= PATH_MAX - 1) {
 436                 filp = ERR_PTR(-ENAMETOOLONG);
 437         } else {
 438                 filp = l_filp_open(logname, flags, mode);
 439                 if (IS_ERR(filp))
 440                         CERROR("logfile creation %s: %ld\n", logname,
 441                                PTR_ERR(filp));
 442         }
 443
 444         OBD_FREE(logname, PATH_MAX);
 445         return filp;
 446 }
 447
 448 /* This is a callback from the llog_* functions.
 449  * Assumes caller has already pushed us into the kernel context. */
 450 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 451                             struct llog_logid *logid, char *name)
 452 {
 453         struct llog_handle *handle;
 454         struct obd_device *obd;
 455         struct l_dentry *dchild = NULL;
 456         struct obdo *oa = NULL;
 457         int rc = 0, cleanup_phase = 1;
 458         int open_flags = O_RDWR | O_CREAT | O_LARGEFILE;
 459         ENTRY;
 460
 461         handle = llog_alloc_handle();
 462         if (handle == NULL)
 463                 RETURN(-ENOMEM);
 464         *res = handle;
 465
 466         LASSERT(ctxt);
 467         LASSERT(ctxt->loc_exp);
 468         obd = ctxt->loc_exp->exp_obd;
 469
 470         if (logid != NULL) {
 471                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, logid->lgl_oid,
 472                                              logid->lgl_ogen, logid->lgl_ogr);
 473
 474                 if (IS_ERR(dchild)) {
 475                         rc = PTR_ERR(dchild);
 476                         CERROR("error looking up logfile "LPX64":0x%x: rc %d\n",
 477                                logid->lgl_oid, logid->lgl_ogen, rc);
 478                         GOTO(cleanup, rc);
 479                 }
 480
 481                 cleanup_phase = 2;
 482                 if (dchild->d_inode == NULL) {
 483                         rc = -ENOENT;
 484                         CERROR("nonexistent log file "LPX64":"LPX64": rc %d\n",
 485                                logid->lgl_oid, logid->lgl_ogr, rc);
 486                         GOTO(cleanup, rc);
 487                 }
 488
 489                 handle->lgh_file = l_dentry_open(&obd->obd_ctxt, dchild,
 490                                                     O_RDWR | O_LARGEFILE);
 491                 if (IS_ERR(handle->lgh_file)) {
 492                         rc = PTR_ERR(handle->lgh_file);
 493                         CERROR("error opening logfile "LPX64"0x%x: rc %d\n",
 494                                logid->lgl_oid, logid->lgl_ogen, rc);
 495                         GOTO(cleanup, rc);
 496                 }
 497
 498                 /* assign the value of lgh_id for handle directly */
 499                 handle->lgh_id = *logid;
 500
 501         } else if (name) {
 502                 handle->lgh_file = llog_filp_open(name, open_flags, 0644);
 503                 if (IS_ERR(handle->lgh_file))
 504                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 505
 506                 handle->lgh_id.lgl_ogr = 1;
 507                 handle->lgh_id.lgl_oid =
 508                         handle->lgh_file->f_dentry->d_inode->i_ino;
 509                 handle->lgh_id.lgl_ogen =
 510                         handle->lgh_file->f_dentry->d_inode->i_generation;
 511         } else {
 512                 oa = obdo_alloc();
 513                 if (oa == NULL)
 514                         GOTO(cleanup, rc = -ENOMEM);
 515                 /* XXX get some filter group constants */
 516                 oa->o_gr = 1;
 517                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 518                 rc = obd_create(ctxt->loc_exp, oa, NULL, NULL);
 519                 if (rc)
 520                         GOTO(cleanup, rc);
 521
 522                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, oa->o_id,
 523                                              oa->o_generation, oa->o_gr);
 524
 525                 if (IS_ERR(dchild))
 526                         GOTO(cleanup, rc = PTR_ERR(dchild));
 527                 cleanup_phase = 2;
 528                 handle->lgh_file = l_dentry_open(&obd->obd_ctxt, dchild,
 529                                                  open_flags);
 530                 if (IS_ERR(handle->lgh_file))
 531                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 532
 533                 handle->lgh_id.lgl_ogr = oa->o_gr;
 534                 handle->lgh_id.lgl_oid = oa->o_id;
 535                 handle->lgh_id.lgl_ogen = oa->o_generation;
 536         }
 537
 538         handle->lgh_ctxt = ctxt;
 539  finish:
 540         if (oa)
 541                 obdo_free(oa);
 542         RETURN(rc);
 543 cleanup:
 544         switch (cleanup_phase) {
 545         case 2:
 546                 l_dput(dchild);
 547         case 1:
 548                 llog_free_handle(handle);
 549         }
 550         goto finish;
 551 }
 552
 553 static int llog_lvfs_close(struct llog_handle *handle)
 554 {
 555         int rc;
 556         ENTRY;
 557
 558         rc = filp_close(handle->lgh_file, 0);
 559         if (rc)
 560                 CERROR("error closing log: rc %d\n", rc);
 561         RETURN(rc);
 562 }
 563
 564 static int llog_lvfs_destroy(struct llog_handle *handle)
 565 {
 566         struct dentry *fdentry;
 567         struct obdo *oa;
 568         int rc;
 569         ENTRY;
 570
 571         fdentry = handle->lgh_file->f_dentry;
 572         if (!strcmp(fdentry->d_parent->d_name.name, "LOGS")) {
 573                 struct obd_device *obd = handle->lgh_ctxt->loc_exp->exp_obd;
 574                 struct inode *inode = fdentry->d_parent->d_inode;
 575                 struct obd_run_ctxt saved;
 576
 577                 push_ctxt(&saved, &obd->obd_ctxt, NULL);
 578                 dget(fdentry);
 579                 rc = llog_lvfs_close(handle);
 580
 581                 if (rc == 0) {
 582                         down(&inode->i_sem);
 583                         rc = vfs_unlink(inode, fdentry);
 584                         up(&inode->i_sem);
 585                 }
 586
 587                 dput(fdentry);
 588                 pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 589                 RETURN(rc);
 590         }
 591
 592         oa = obdo_alloc();
 593         if (oa == NULL)
 594                 RETURN(-ENOMEM);
 595
 596         oa->o_id = handle->lgh_id.lgl_oid;
 597         oa->o_gr = handle->lgh_id.lgl_ogr;
 598         oa->o_generation = handle->lgh_id.lgl_ogen;
 599         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 600
 601         rc = llog_lvfs_close(handle);
 602         if (rc)
 603                 GOTO(out, rc);
 604
 605         rc = obd_destroy(handle->lgh_ctxt->loc_exp, oa, NULL, NULL);
 606  out:
 607         obdo_free(oa);
 608         RETURN(rc);
 609 }
 610
 611 /* reads the catalog list */
 612 int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 613                       char *name, int count, struct llog_catid *idarray)
 614 {
 615         struct obd_run_ctxt saved;
 616         struct l_file *file;
 617         int rc;
 618         int size = sizeof(*idarray) * count;
 619         loff_t off = 0;
 620
 621         LASSERT(count);
 622
 623         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 624         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 625         if (!file || IS_ERR(file)) {
 626                 rc = PTR_ERR(file);
 627                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 628                        name, rc);
 629                 GOTO(out, rc);
 630         }
 631
 632         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 633                 CERROR("%s is not a regular file!: mode = %o\n", name,
 634                        file->f_dentry->d_inode->i_mode);
 635                 GOTO(out, rc = -ENOENT);
 636         }
 637
 638         rc = fsfilt_read_record(disk_obd, file, idarray, size, &off);
 639         if (rc) {
 640                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 641                        name, rc);
 642                 GOTO(out, rc);
 643         }
 644
 645  out:
 646         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 647         if (file && !IS_ERR(file))
 648                 rc = filp_close(file, 0);
 649         RETURN(rc);
 650 }
 651 EXPORT_SYMBOL(llog_get_cat_list);
 652
 653 /* writes the cat list */
 654 int llog_put_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 655                       char *name, int count, struct llog_catid *idarray)
 656 {
 657         struct obd_run_ctxt saved;
 658         struct l_file *file;
 659         int rc;
 660         int size = sizeof(*idarray) * count;
 661         loff_t off = 0;
 662
 663         LASSERT(count);
 664
 665         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 666         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 667         if (!file || IS_ERR(file)) {
 668                 rc = PTR_ERR(file);
 669                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 670                        name, rc);
 671                 GOTO(out, rc);
 672         }
 673
 674         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 675                 CERROR("%s is not a regular file!: mode = %o\n", name,
 676                        file->f_dentry->d_inode->i_mode);
 677                 GOTO(out, rc = -ENOENT);
 678         }
 679
 680         rc = fsfilt_write_record(disk_obd, file, idarray, size, &off, 1);
 681         if (rc) {
 682                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 683                        name, rc);
 684                 GOTO(out, rc);
 685         }
 686
 687  out:
 688         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 689         if (file && !IS_ERR(file))
 690                 rc = filp_close(file, 0);
 691         RETURN(rc);
 692 }
 693
 694 struct llog_operations llog_lvfs_ops = {
 695         lop_write_rec:   llog_lvfs_write_rec,
 696         lop_next_block:  llog_lvfs_next_block,
 697         lop_read_header: llog_lvfs_read_header,
 698         lop_create:      llog_lvfs_create,
 699         lop_destroy:     llog_lvfs_destroy,
 700         lop_close:       llog_lvfs_close,
 701         //        lop_cancel: llog_lvfs_cancel,
 702 };
 703
 704 EXPORT_SYMBOL(llog_lvfs_ops);
 705
 706 #else /* !__KERNEL__ */
 707
 708 static int llog_lvfs_read_header(struct llog_handle *handle)
 709 {
 710         LBUG();
 711         return 0;
 712 }
 713
 714 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 715                                struct llog_rec_hdr *rec,
 716                                struct llog_cookie *reccookie, int cookiecount,
 717                                void *buf, int idx)
 718 {
 719         LBUG();
 720         return 0;
 721 }
 722
 723 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 724                                 int next_idx, __u64 *cur_offset, void *buf,
 725                                 int len)
 726 {
 727         LBUG();
 728         return 0;
 729 }
 730
 731 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 732                             struct llog_logid *logid, char *name)
 733 {
 734         LBUG();
 735         return 0;
 736 }
 737
 738 static int llog_lvfs_close(struct llog_handle *handle)
 739 {
 740         LBUG();
 741         return 0;
 742 }
 743
 744 static int llog_lvfs_destroy(struct llog_handle *handle)
 745 {
 746         LBUG();
 747         return 0;
 748 }
 749
 750 int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 751                       char *name, int count, struct llog_catid *idarray)
 752 {
 753         LBUG();
 754         return 0;
 755 }
 756
 757 int llog_put_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 758                       char *name, int count, struct llog_catid *idarray)
 759 {
 760         LBUG();
 761         return 0;
 762 }
 763
 764 struct llog_operations llog_lvfs_ops = {
 765         lop_write_rec:   llog_lvfs_write_rec,
 766         lop_next_block:  llog_lvfs_next_block,
 767         lop_read_header: llog_lvfs_read_header,
 768         lop_create:      llog_lvfs_create,
 769         lop_destroy:     llog_lvfs_destroy,
 770         lop_close:       llog_lvfs_close,
 771 //        lop_cancel:      llog_lvfs_cancel,
 772 };
 773 #endif