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 the Lustre file system, http://www.lustre.org
   8  *   Lustre is a trademark of Cluster File Systems, Inc.
   9  *
  10  *   You may have signed or agreed to another license before downloading
  11  *   this software.  If so, you are bound by the terms and conditions
  12  *   of that agreement, and the following does not apply to you.  See the
  13  *   LICENSE file included with this distribution for more information.
  14  *
  15  *   If you did not agree to a different license, then this copy of Lustre
  16  *   is open source software; you can redistribute it and/or modify it
  17  *   under the terms of version 2 of the GNU General Public License as
  18  *   published by the Free Software Foundation.
  19  *
  20  *   In either case, Lustre is distributed in the hope that it will be
  21  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  22  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   license text for more details.
  24  *
  25  * OST<->MDS recovery logging infrastructure.
  26  *
  27  * Invariants in implementation:
  28  * - we do not share logs among different OST<->MDS connections, so that
  29  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  30  */
  31
  32 #define DEBUG_SUBSYSTEM S_LOG
  33
  34 #ifndef EXPORT_SYMTAB
  35 #define EXPORT_SYMTAB
  36 #endif
  37
  38 #ifndef __KERNEL__
  39 #include <liblustre.h>
  40 #endif
  41
  42 #include <obd.h>
  43 #include <obd_class.h>
  44 #include <lustre_log.h>
  45 #include <obd_ost.h>
  46 #include <libcfs/list.h>
  47 #include <lvfs.h>
  48 #include <lustre_fsfilt.h>
  49 #include <lustre_disk.h>
  50 #include "llog_internal.h"
  51
  52 #if defined(__KERNEL__) && defined(LLOG_LVFS)
  53
  54 static int llog_lvfs_pad(struct obd_device *obd, struct l_file *file,
  55                                 int len, int index)
  56 {
  57         struct llog_rec_hdr rec = { 0 };
  58         struct llog_rec_tail tail;
  59         int rc;
  60         ENTRY;
  61
  62         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
  63
  64         tail.lrt_len = rec.lrh_len = len;
  65         tail.lrt_index = rec.lrh_index = index;
  66         rec.lrh_type = LLOG_PAD_MAGIC;
  67
  68         rc = fsfilt_write_record(obd, file, &rec, sizeof(rec), &file->f_pos, 0);
  69         if (rc) {
  70                 CERROR("error writing padding record: rc %d\n", rc);
  71                 goto out;
  72         }
  73
  74         file->f_pos += len - sizeof(rec) - sizeof(tail);
  75         rc = fsfilt_write_record(obd, file, &tail, sizeof(tail),&file->f_pos,0);
  76         if (rc) {
  77                 CERROR("error writing padding record: rc %d\n", rc);
  78                 goto out;
  79         }
  80
  81  out:
  82         RETURN(rc);
  83 }
  84
  85 static int llog_lvfs_write_blob(struct obd_device *obd, struct l_file *file,
  86                                 struct llog_rec_hdr *rec, void *buf, loff_t off)
  87 {
  88         int rc;
  89         struct llog_rec_tail end;
  90         loff_t saved_off = file->f_pos;
  91         int buflen = rec->lrh_len;
  92         ENTRY;
  93
  94         file->f_pos = off;
  95
  96         if (buflen == 0)
  97                 CWARN("0-length record\n");
  98
  99         if (!buf) {
 100                 rc = fsfilt_write_record(obd, file, rec, buflen,&file->f_pos,0);
 101                 if (rc) {
 102                         CERROR("error writing log record: rc %d\n", rc);
 103                         goto out;
 104                 }
 105                 GOTO(out, rc = 0);
 106         }
 107
 108         /* the buf case */
 109         rec->lrh_len = sizeof(*rec) + buflen + sizeof(end);
 110         rc = fsfilt_write_record(obd, file, rec, sizeof(*rec), &file->f_pos, 0);
 111         if (rc) {
 112                 CERROR("error writing log hdr: rc %d\n", rc);
 113                 goto out;
 114         }
 115
 116         rc = fsfilt_write_record(obd, file, buf, buflen, &file->f_pos, 0);
 117         if (rc) {
 118                 CERROR("error writing log buffer: rc %d\n", rc);
 119                 goto out;
 120         }
 121
 122         end.lrt_len = rec->lrh_len;
 123         end.lrt_index = rec->lrh_index;
 124         rc = fsfilt_write_record(obd, file, &end, sizeof(end), &file->f_pos, 0);
 125         if (rc) {
 126                 CERROR("error writing log tail: rc %d\n", rc);
 127                 goto out;
 128         }
 129
 130         rc = 0;
 131  out:
 132         if (saved_off > file->f_pos)
 133                 file->f_pos = saved_off;
 134         LASSERT(rc <= 0);
 135         RETURN(rc);
 136 }
 137
 138 static int llog_lvfs_read_blob(struct obd_device *obd, struct l_file *file,
 139                                 void *buf, int size, loff_t off)
 140 {
 141         loff_t offset = off;
 142         int rc;
 143         ENTRY;
 144
 145         rc = fsfilt_read_record(obd, file, buf, size, &offset);
 146         if (rc) {
 147                 CERROR("error reading log record: rc %d\n", rc);
 148                 RETURN(rc);
 149         }
 150         RETURN(0);
 151 }
 152
 153 static int llog_lvfs_read_header(struct llog_handle *handle)
 154 {
 155         struct obd_device *obd;
 156         int rc;
 157         ENTRY;
 158
 159         LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
 160
 161         obd = handle->lgh_ctxt->loc_exp->exp_obd;
 162
 163         if (handle->lgh_file->f_dentry->d_inode->i_size == 0) {
 164                 CDEBUG(D_HA, "not reading header from 0-byte log\n");
 165                 RETURN(LLOG_EEMPTY);
 166         }
 167
 168         rc = llog_lvfs_read_blob(obd, handle->lgh_file, handle->lgh_hdr,
 169                                  LLOG_CHUNK_SIZE, 0);
 170         if (rc) {
 171                 CERROR("error reading log header from %.*s\n",
 172                        handle->lgh_file->f_dentry->d_name.len,
 173                        handle->lgh_file->f_dentry->d_name.name);
 174         } else {
 175                 struct llog_rec_hdr *llh_hdr = &handle->lgh_hdr->llh_hdr;
 176
 177                 if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
 178                         lustre_swab_llog_hdr(handle->lgh_hdr);
 179
 180                 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 181                         CERROR("bad log %.*s header magic: %#x (expected %#x)\n",
 182                                handle->lgh_file->f_dentry->d_name.len,
 183                                handle->lgh_file->f_dentry->d_name.name,
 184                                llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 185                         rc = -EIO;
 186                 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 187                         CERROR("incorrectly sized log %.*s header: %#x "
 188                                "(expected %#x)\n",
 189                                handle->lgh_file->f_dentry->d_name.len,
 190                                handle->lgh_file->f_dentry->d_name.name,
 191                                llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 192                         CERROR("you may need to re-run lconf --write_conf.\n");
 193                         rc = -EIO;
 194                 }
 195         }
 196
 197         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 198         handle->lgh_file->f_pos = handle->lgh_file->f_dentry->d_inode->i_size;
 199
 200         RETURN(rc);
 201 }
 202
 203 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 204 /* appends if idx == -1, otherwise overwrites record idx. */
 205 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 206                                struct llog_rec_hdr *rec,
 207                                struct llog_cookie *reccookie, int cookiecount,
 208                                void *buf, int idx)
 209 {
 210         struct llog_log_hdr *llh;
 211         int reclen = rec->lrh_len, index, rc;
 212         struct llog_rec_tail *lrt;
 213         struct obd_device *obd;
 214         struct file *file;
 215         size_t left;
 216         ENTRY;
 217
 218         llh = loghandle->lgh_hdr;
 219         file = loghandle->lgh_file;
 220         obd = loghandle->lgh_ctxt->loc_exp->exp_obd;
 221
 222         /* record length should not bigger than LLOG_CHUNK_SIZE */
 223         if (buf)
 224                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
 225                       sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 226         else
 227                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 228         if (rc)
 229                 RETURN(rc);
 230
 231         if (buf)
 232                 /* write_blob adds header and tail to lrh_len. */
 233                 reclen = sizeof(*rec) + rec->lrh_len +
 234                         sizeof(struct llog_rec_tail);
 235
 236         if (idx != -1) {
 237                 loff_t saved_offset;
 238
 239                 /* no header: only allowed to insert record 1 */
 240                 if (idx != 1 && !file->f_dentry->d_inode->i_size) {
 241                         CERROR("idx != -1 in empty log\n");
 242                         LBUG();
 243                 }
 244
 245                 if (idx && llh->llh_size && llh->llh_size != rec->lrh_len)
 246                         RETURN(-EINVAL);
 247
 248                 if (!ext2_test_bit(idx, llh->llh_bitmap))
 249                         CERROR("Modify unset record %u\n", idx);
 250                 if (idx != rec->lrh_index)
 251                         CERROR("Index mismatch %d %u\n", idx, rec->lrh_index);
 252
 253                 rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 254                 /* we are done if we only write the header or on error */
 255                 if (rc || idx == 0)
 256                         RETURN(rc);
 257
 258                 /* Assumes constant lrh_len */
 259                 saved_offset = sizeof(*llh) + (idx - 1) * reclen;
 260
 261                 if (buf) {
 262                         struct llog_rec_hdr check;
 263
 264                         /* We assume that caller has set lgh_cur_* */
 265                         saved_offset = loghandle->lgh_cur_offset;
 266                         CDEBUG(D_OTHER,
 267                                "modify record "LPX64": idx:%d/%u/%d, len:%u "
 268                                "offset %llu\n",
 269                                loghandle->lgh_id.lgl_oid, idx, rec->lrh_index,
 270                                loghandle->lgh_cur_idx, rec->lrh_len,
 271                                (long long)(saved_offset - sizeof(*llh)));
 272                         if (rec->lrh_index != loghandle->lgh_cur_idx) {
 273                                 CERROR("modify idx mismatch %u/%d\n",
 274                                        idx, loghandle->lgh_cur_idx);
 275                                 RETURN(-EFAULT);
 276                         }
 277 #if 1  /* FIXME remove this safety check at some point */
 278                         /* Verify that the record we're modifying is the
 279                            right one. */
 280                         rc = llog_lvfs_read_blob(obd, file, &check,
 281                                                  sizeof(check), saved_offset);
 282                         if (check.lrh_index != idx || check.lrh_len != reclen) {
 283                                 CERROR("Bad modify idx %u/%u size %u/%u (%d)\n",
 284                                        idx, check.lrh_index, reclen,
 285                                        check.lrh_len, rc);
 286                                 RETURN(-EFAULT);
 287                         }
 288 #endif
 289                 }
 290
 291                 rc = llog_lvfs_write_blob(obd, file, rec, buf, saved_offset);
 292                 if (rc == 0 && reccookie) {
 293                         reccookie->lgc_lgl = loghandle->lgh_id;
 294                         reccookie->lgc_index = idx;
 295                         rc = 1;
 296                 }
 297                 RETURN(rc);
 298         }
 299
 300         /* Make sure that records don't cross a chunk boundary, so we can
 301          * process them page-at-a-time if needed.  If it will cross a chunk
 302          * boundary, write in a fake (but referenced) entry to pad the chunk.
 303          *
 304          * We know that llog_current_log() will return a loghandle that is
 305          * big enough to hold reclen, so all we care about is padding here.
 306          */
 307         left = LLOG_CHUNK_SIZE - (file->f_pos & (LLOG_CHUNK_SIZE - 1));
 308
 309         /* NOTE: padding is a record, but no bit is set */
 310         if (left != 0 && left != reclen &&
 311             left < (reclen + LLOG_MIN_REC_SIZE)) {
 312                 loghandle->lgh_last_idx++;
 313                 rc = llog_lvfs_pad(obd, file, left, loghandle->lgh_last_idx);
 314                 if (rc)
 315                         RETURN(rc);
 316                 /* if it's the last idx in log file, then return -ENOSPC */
 317                 if (loghandle->lgh_last_idx == LLOG_BITMAP_SIZE(llh) - 1)
 318                         RETURN(-ENOSPC);
 319         }
 320
 321         loghandle->lgh_last_idx++;
 322         index = loghandle->lgh_last_idx;
 323         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 324         rec->lrh_index = index;
 325         if (buf == NULL) {
 326                 lrt = (struct llog_rec_tail *)
 327                         ((char *)rec + rec->lrh_len - sizeof(*lrt));
 328                 lrt->lrt_len = rec->lrh_len;
 329                 lrt->lrt_index = rec->lrh_index;
 330         }
 331         if (ext2_set_bit(index, llh->llh_bitmap)) {
 332                 CERROR("argh, index %u already set in log bitmap?\n", index);
 333                 LBUG(); /* should never happen */
 334         }
 335         llh->llh_count++;
 336         llh->llh_tail.lrt_index = index;
 337
 338         rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 339         if (rc)
 340                 RETURN(rc);
 341
 342         rc = llog_lvfs_write_blob(obd, file, rec, buf, file->f_pos);
 343         if (rc)
 344                 RETURN(rc);
 345
 346         CDEBUG(D_HA, "added record "LPX64": idx: %u, %u bytes\n",
 347                loghandle->lgh_id.lgl_oid, index, rec->lrh_len);
 348         if (rc == 0 && reccookie) {
 349                 reccookie->lgc_lgl = loghandle->lgh_id;
 350                 reccookie->lgc_index = index;
 351                 if ((rec->lrh_type == MDS_UNLINK_REC) ||
 352                                 (rec->lrh_type == MDS_SETATTR_REC))
 353                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 354                 else if (rec->lrh_type == OST_SZ_REC)
 355                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 356                 else if (rec->lrh_type == OST_RAID1_REC)
 357                         reccookie->lgc_subsys = LLOG_RD1_ORIG_CTXT;
 358                 else
 359                         reccookie->lgc_subsys = -1;
 360                 rc = 1;
 361         }
 362         if (rc == 0 && rec->lrh_type == LLOG_GEN_REC)
 363                 rc = 1;
 364
 365         RETURN(rc);
 366 }
 367
 368 /* We can skip reading at least as many log blocks as the number of
 369 * minimum sized log records we are skipping.  If it turns out
 370 * that we are not far enough along the log (because the
 371 * actual records are larger than minimum size) we just skip
 372 * some more records. */
 373
 374 static void llog_skip_over(__u64 *off, int curr, int goal)
 375 {
 376         if (goal <= curr)
 377                 return;
 378         *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
 379                 ~(LLOG_CHUNK_SIZE - 1);
 380 }
 381
 382
 383 /* sets:
 384  *  - cur_offset to the furthest point read in the log file
 385  *  - cur_idx to the log index preceeding cur_offset
 386  * returns -EIO/-EINVAL on error
 387  */
 388 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 389                                 int next_idx, __u64 *cur_offset, void *buf,
 390                                 int len)
 391 {
 392         int rc;
 393         ENTRY;
 394
 395         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 396                 RETURN(-EINVAL);
 397
 398         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 399                next_idx, *cur_idx, *cur_offset);
 400
 401         while (*cur_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 402                 struct llog_rec_hdr *rec;
 403                 struct llog_rec_tail *tail;
 404                 loff_t ppos;
 405
 406                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 407
 408                 ppos = *cur_offset;
 409                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 410                                         loghandle->lgh_file, buf, len,
 411                                         &ppos);
 412                 if (rc) {
 413                         CERROR("Cant read llog block at log id "LPU64
 414                                "/%u offset "LPU64"\n",
 415                                loghandle->lgh_id.lgl_oid,
 416                                loghandle->lgh_id.lgl_ogen,
 417                                *cur_offset);
 418                         RETURN(rc);
 419                 }
 420
 421                 /* put number of bytes read into rc to make code simpler */
 422                 rc = ppos - *cur_offset;
 423                 *cur_offset = ppos;
 424
 425                 if (rc < len) {
 426                         /* signal the end of the valid buffer to llog_process */
 427                         memset(buf + rc, 0, len - rc);
 428                 }
 429
 430                 if (rc == 0) /* end of file, nothing to do */
 431                         RETURN(0);
 432
 433                 if (rc < sizeof(*tail)) {
 434                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 435                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 436                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 437                         RETURN(-EINVAL);
 438                 }
 439
 440                 rec = buf;
 441                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 442                                                 sizeof(struct llog_rec_tail));
 443
 444                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec)) {
 445                         lustre_swab_llog_rec(rec, tail);
 446                 }
 447
 448                 *cur_idx = tail->lrt_index;
 449
 450                 /* this shouldn't happen */
 451                 if (tail->lrt_index == 0) {
 452                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 453                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 454                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 455                         RETURN(-EINVAL);
 456                 }
 457                 if (tail->lrt_index < next_idx)
 458                         continue;
 459
 460                 /* sanity check that the start of the new buffer is no farther
 461                  * than the record that we wanted.  This shouldn't happen. */
 462                 if (rec->lrh_index > next_idx) {
 463                         CERROR("missed desired record? %u > %u\n",
 464                                rec->lrh_index, next_idx);
 465                         RETURN(-ENOENT);
 466                 }
 467                 RETURN(0);
 468         }
 469         RETURN(-EIO);
 470 }
 471
 472 static int llog_lvfs_prev_block(struct llog_handle *loghandle,
 473                                 int prev_idx, void *buf, int len)
 474 {
 475         __u64 cur_offset;
 476         int rc;
 477         ENTRY;
 478
 479         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 480                 RETURN(-EINVAL);
 481
 482         CDEBUG(D_OTHER, "looking for log index %u n", prev_idx);
 483
 484         cur_offset = LLOG_CHUNK_SIZE;
 485         llog_skip_over(&cur_offset, 0, prev_idx);
 486
 487         while (cur_offset < loghandle->lgh_file->f_dentry->d_inode->i_size) {
 488                 struct llog_rec_hdr *rec;
 489                 struct llog_rec_tail *tail;
 490                 loff_t ppos;
 491
 492                 ppos = cur_offset;
 493
 494                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 495                                         loghandle->lgh_file, buf, len,
 496                                         &ppos);
 497                 if (rc) {
 498                         CERROR("Cant read llog block at log id "LPU64
 499                                "/%u offset "LPU64"\n",
 500                                loghandle->lgh_id.lgl_oid,
 501                                loghandle->lgh_id.lgl_ogen,
 502                                cur_offset);
 503                         RETURN(rc);
 504                 }
 505
 506                 /* put number of bytes read into rc to make code simpler */
 507                 rc = ppos - cur_offset;
 508                 cur_offset = ppos;
 509
 510                 if (rc == 0) /* end of file, nothing to do */
 511                         RETURN(0);
 512
 513                 if (rc < sizeof(*tail)) {
 514                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 515                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 516                                loghandle->lgh_id.lgl_ogen, cur_offset);
 517                         RETURN(-EINVAL);
 518                 }
 519
 520                 tail = buf + rc - sizeof(struct llog_rec_tail);
 521
 522                 /* this shouldn't happen */
 523                 if (tail->lrt_index == 0) {
 524                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 525                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 526                                loghandle->lgh_id.lgl_ogen, cur_offset);
 527                         RETURN(-EINVAL);
 528                 }
 529                 if (le32_to_cpu(tail->lrt_index) < prev_idx)
 530                         continue;
 531
 532                 /* sanity check that the start of the new buffer is no farther
 533                  * than the record that we wanted.  This shouldn't happen. */
 534                 rec = buf;
 535                 if (le32_to_cpu(rec->lrh_index) > prev_idx) {
 536                         CERROR("missed desired record? %u > %u\n",
 537                                le32_to_cpu(rec->lrh_index), prev_idx);
 538                         RETURN(-ENOENT);
 539                 }
 540                 RETURN(0);
 541         }
 542         RETURN(-EIO);
 543 }
 544
 545 static struct file *llog_filp_open(char *dir, char *name, int flags, int mode)
 546 {
 547         char *logname;
 548         struct file *filp;
 549         int len;
 550
 551         OBD_ALLOC(logname, PATH_MAX);
 552         if (logname == NULL)
 553                 return ERR_PTR(-ENOMEM);
 554
 555         len = snprintf(logname, PATH_MAX, "%s/%s", dir, name);
 556         if (len >= PATH_MAX - 1) {
 557                 filp = ERR_PTR(-ENAMETOOLONG);
 558         } else {
 559                 filp = l_filp_open(logname, flags, mode);
 560                 if (IS_ERR(filp))
 561                         CERROR("logfile creation %s: %ld\n", logname,
 562                                PTR_ERR(filp));
 563         }
 564         OBD_FREE(logname, PATH_MAX);
 565         return filp;
 566 }
 567
 568 /* This is a callback from the llog_* functions.
 569  * Assumes caller has already pushed us into the kernel context. */
 570 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 571                             struct llog_logid *logid, char *name)
 572 {
 573         struct llog_handle *handle;
 574         struct obd_device *obd;
 575         struct l_dentry *dchild = NULL;
 576         struct obdo *oa = NULL;
 577         int rc = 0, cleanup_phase = 1;
 578         int open_flags = O_RDWR | O_CREAT | O_LARGEFILE;
 579         ENTRY;
 580
 581         handle = llog_alloc_handle();
 582         if (handle == NULL)
 583                 RETURN(-ENOMEM);
 584         *res = handle;
 585
 586         LASSERT(ctxt);
 587         LASSERT(ctxt->loc_exp);
 588         obd = ctxt->loc_exp->exp_obd;
 589
 590         if (logid != NULL) {
 591                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, logid->lgl_oid,
 592                                              logid->lgl_ogen, logid->lgl_ogr);
 593
 594                 if (IS_ERR(dchild)) {
 595                         rc = PTR_ERR(dchild);
 596                         CERROR("error looking up logfile "LPX64":0x%x: rc %d\n",
 597                                logid->lgl_oid, logid->lgl_ogen, rc);
 598                         GOTO(cleanup, rc);
 599                 }
 600
 601                 cleanup_phase = 2;
 602                 if (dchild->d_inode == NULL) {
 603                         rc = -ENOENT;
 604                         CERROR("nonexistent log file "LPX64":"LPX64": rc %d\n",
 605                                logid->lgl_oid, logid->lgl_ogr, rc);
 606                         GOTO(cleanup, rc);
 607                 }
 608
 609                 handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 610                                                     O_RDWR | O_LARGEFILE);
 611                 if (IS_ERR(handle->lgh_file)) {
 612                         rc = PTR_ERR(handle->lgh_file);
 613                         CERROR("error opening logfile "LPX64"0x%x: rc %d\n",
 614                                logid->lgl_oid, logid->lgl_ogen, rc);
 615                         GOTO(cleanup, rc);
 616                 }
 617
 618                 /* assign the value of lgh_id for handle directly */
 619                 handle->lgh_id = *logid;
 620
 621         } else if (name) {
 622                 /* COMPAT_146 */
 623                 if (strcmp(obd->obd_type->typ_name, LUSTRE_MDS_NAME) == 0) {
 624                         handle->lgh_file = llog_filp_open(MDT_LOGS_DIR, name,
 625                                                           open_flags, 0644);
 626                 } else {
 627                         /* end COMPAT_146 */
 628                         handle->lgh_file = llog_filp_open(MOUNT_CONFIGS_DIR,
 629                                                           name, open_flags,
 630                                                           0644);
 631                 }
 632                 if (IS_ERR(handle->lgh_file))
 633                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 634
 635                 handle->lgh_id.lgl_ogr = 1;
 636                 handle->lgh_id.lgl_oid =
 637                         handle->lgh_file->f_dentry->d_inode->i_ino;
 638                 handle->lgh_id.lgl_ogen =
 639                         handle->lgh_file->f_dentry->d_inode->i_generation;
 640         } else {
 641                 oa = obdo_alloc();
 642                 if (oa == NULL)
 643                         GOTO(cleanup, rc = -ENOMEM);
 644
 645                 oa->o_gr = FILTER_GROUP_LLOG;
 646                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 647
 648                 rc = obd_create(ctxt->loc_exp, oa, NULL, NULL);
 649                 if (rc)
 650                         GOTO(cleanup, rc);
 651
 652                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, oa->o_id,
 653                                              oa->o_generation, oa->o_gr);
 654
 655                 if (IS_ERR(dchild))
 656                         GOTO(cleanup, rc = PTR_ERR(dchild));
 657                 cleanup_phase = 2;
 658                 handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 659                                                  open_flags);
 660                 if (IS_ERR(handle->lgh_file))
 661                         GOTO(cleanup, rc = PTR_ERR(handle->lgh_file));
 662
 663                 handle->lgh_id.lgl_ogr = oa->o_gr;
 664                 handle->lgh_id.lgl_oid = oa->o_id;
 665                 handle->lgh_id.lgl_ogen = oa->o_generation;
 666         }
 667
 668         handle->lgh_ctxt = ctxt;
 669  finish:
 670         if (oa)
 671                 obdo_free(oa);
 672         RETURN(rc);
 673 cleanup:
 674         switch (cleanup_phase) {
 675         case 2:
 676                 l_dput(dchild);
 677         case 1:
 678                 llog_free_handle(handle);
 679         }
 680         goto finish;
 681 }
 682
 683 static int llog_lvfs_close(struct llog_handle *handle)
 684 {
 685         int rc;
 686         ENTRY;
 687
 688         rc = filp_close(handle->lgh_file, 0);
 689         if (rc)
 690                 CERROR("error closing log: rc %d\n", rc);
 691         RETURN(rc);
 692 }
 693
 694 static int llog_lvfs_destroy(struct llog_handle *handle)
 695 {
 696         struct dentry *fdentry;
 697         struct obdo *oa;
 698         struct obd_device *obd = handle->lgh_ctxt->loc_exp->exp_obd;
 699         char *dir;
 700         int rc;
 701         ENTRY;
 702
 703         /* COMPAT_146 */
 704         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDS_NAME) == 0)
 705                 dir = MDT_LOGS_DIR;
 706         else
 707                 /* end COMPAT_146 */
 708                 dir = MOUNT_CONFIGS_DIR;
 709
 710         fdentry = handle->lgh_file->f_dentry;
 711         if (strcmp(fdentry->d_parent->d_name.name, dir) == 0) {
 712                 struct inode *inode = fdentry->d_parent->d_inode;
 713                 struct lvfs_run_ctxt saved;
 714
 715                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 716                 dget(fdentry);
 717                 rc = llog_lvfs_close(handle);
 718
 719                 if (rc == 0) {
 720                         LOCK_INODE_MUTEX(inode);
 721                         rc = vfs_unlink(inode, fdentry);
 722                         UNLOCK_INODE_MUTEX(inode);
 723                 }
 724
 725                 dput(fdentry);
 726                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 727                 RETURN(rc);
 728         }
 729
 730         oa = obdo_alloc();
 731         if (oa == NULL)
 732                 RETURN(-ENOMEM);
 733
 734         oa->o_id = handle->lgh_id.lgl_oid;
 735         oa->o_gr = handle->lgh_id.lgl_ogr;
 736         oa->o_generation = handle->lgh_id.lgl_ogen;
 737         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 738
 739         rc = llog_lvfs_close(handle);
 740         if (rc)
 741                 GOTO(out, rc);
 742
 743         rc = obd_destroy(handle->lgh_ctxt->loc_exp, oa, NULL, NULL, NULL);
 744  out:
 745         obdo_free(oa);
 746         RETURN(rc);
 747 }
 748
 749 /* reads the catalog list */
 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         struct lvfs_run_ctxt saved;
 754         struct l_file *file;
 755         int rc;
 756         int size = sizeof(*idarray) * count;
 757         loff_t off = 0;
 758         ENTRY;
 759
 760         if (!count)
 761                 RETURN(0);
 762
 763         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 764         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 765         if (!file || IS_ERR(file)) {
 766                 rc = PTR_ERR(file);
 767                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 768                        name, rc);
 769                 GOTO(out, rc);
 770         }
 771
 772         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 773                 CERROR("%s is not a regular file!: mode = %o\n", name,
 774                        file->f_dentry->d_inode->i_mode);
 775                 GOTO(out, rc = -ENOENT);
 776         }
 777
 778         CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
 779                (int)file->f_dentry->d_inode->i_size, size);
 780
 781         rc = fsfilt_read_record(disk_obd, file, idarray, size, &off);
 782         if (rc) {
 783                 CERROR("OBD filter: error reading %s: rc %d\n", name, rc);
 784                 GOTO(out, rc);
 785         }
 786
 787         EXIT;
 788  out:
 789         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 790         if (file && !IS_ERR(file))
 791                 rc = filp_close(file, 0);
 792         return rc;
 793 }
 794 EXPORT_SYMBOL(llog_get_cat_list);
 795
 796 /* writes the cat list */
 797 int llog_put_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 798                       char *name, int count, struct llog_catid *idarray)
 799 {
 800         struct lvfs_run_ctxt saved;
 801         struct l_file *file;
 802         int rc;
 803         int size = sizeof(*idarray) * count;
 804         loff_t off = 0;
 805
 806         if (!count)
 807                 return (0);
 808
 809         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 810         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 811         if (!file || IS_ERR(file)) {
 812                 rc = PTR_ERR(file);
 813                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 814                        name, rc);
 815                 GOTO(out, rc);
 816         }
 817
 818         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 819                 CERROR("%s is not a regular file!: mode = %o\n", name,
 820                        file->f_dentry->d_inode->i_mode);
 821                 GOTO(out, rc = -ENOENT);
 822         }
 823
 824         rc = fsfilt_write_record(disk_obd, file, idarray, size, &off, 1);
 825         if (rc) {
 826                 CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
 827                        name, rc);
 828                 GOTO(out, rc);
 829         }
 830
 831  out:
 832         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 833         if (file && !IS_ERR(file))
 834                 rc = filp_close(file, 0);
 835         RETURN(rc);
 836 }
 837
 838 struct llog_operations llog_lvfs_ops = {
 839         lop_write_rec:   llog_lvfs_write_rec,
 840         lop_next_block:  llog_lvfs_next_block,
 841         lop_prev_block:  llog_lvfs_prev_block,
 842         lop_read_header: llog_lvfs_read_header,
 843         lop_create:      llog_lvfs_create,
 844         lop_destroy:     llog_lvfs_destroy,
 845         lop_close:       llog_lvfs_close,
 846         //        lop_cancel: llog_lvfs_cancel,
 847 };
 848
 849 EXPORT_SYMBOL(llog_lvfs_ops);
 850
 851 #else /* !__KERNEL__ */
 852
 853 static int llog_lvfs_read_header(struct llog_handle *handle)
 854 {
 855         LBUG();
 856         return 0;
 857 }
 858
 859 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 860                                struct llog_rec_hdr *rec,
 861                                struct llog_cookie *reccookie, int cookiecount,
 862                                void *buf, int idx)
 863 {
 864         LBUG();
 865         return 0;
 866 }
 867
 868 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 869                                 int next_idx, __u64 *cur_offset, void *buf,
 870                                 int len)
 871 {
 872         LBUG();
 873         return 0;
 874 }
 875
 876 static int llog_lvfs_prev_block(struct llog_handle *loghandle,
 877                                 int prev_idx, void *buf, int len)
 878 {
 879         LBUG();
 880         return 0;
 881 }
 882
 883 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 884                             struct llog_logid *logid, char *name)
 885 {
 886         LBUG();
 887         return 0;
 888 }
 889
 890 static int llog_lvfs_close(struct llog_handle *handle)
 891 {
 892         LBUG();
 893         return 0;
 894 }
 895
 896 static int llog_lvfs_destroy(struct llog_handle *handle)
 897 {
 898         LBUG();
 899         return 0;
 900 }
 901
 902 int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 903                       char *name, int count, struct llog_catid *idarray)
 904 {
 905         LBUG();
 906         return 0;
 907 }
 908
 909 int llog_put_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
 910                       char *name, int count, struct llog_catid *idarray)
 911 {
 912         LBUG();
 913         return 0;
 914 }
 915
 916 struct llog_operations llog_lvfs_ops = {
 917         lop_write_rec:   llog_lvfs_write_rec,
 918         lop_next_block:  llog_lvfs_next_block,
 919         lop_prev_block:  llog_lvfs_prev_block,
 920         lop_read_header: llog_lvfs_read_header,
 921         lop_create:      llog_lvfs_create,
 922         lop_destroy:     llog_lvfs_destroy,
 923         lop_close:       llog_lvfs_close,
 924 //        lop_cancel:      llog_lvfs_cancel,
 925 };
 926 #endif