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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdclass/llog_lvfs.c
  37  *
  38  * OST<->MDS recovery logging infrastructure.
  39  * Invariants in implementation:
  40  * - we do not share logs among different OST<->MDS connections, so that
  41  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  42  *
  43  * Author: Andreas Dilger <adilger@clusterfs.com>
  44  */
  45
  46 #define DEBUG_SUBSYSTEM S_LOG
  47
  48 #ifndef EXPORT_SYMTAB
  49 #define EXPORT_SYMTAB
  50 #endif
  51
  52 #ifndef __KERNEL__
  53 #include <liblustre.h>
  54 #endif
  55
  56 #include <obd.h>
  57 #include <obd_class.h>
  58 #include <lustre_log.h>
  59 #include <obd_ost.h>
  60 #include <libcfs/list.h>
  61 #include <lvfs.h>
  62 #include <lustre_fsfilt.h>
  63 #include <lustre_disk.h>
  64 #include "llog_internal.h"
  65
  66 #if defined(__KERNEL__) && defined(LLOG_LVFS)
  67
  68 static int llog_lvfs_pad(struct obd_device *obd, struct l_file *file,
  69                                 int len, int index)
  70 {
  71         struct llog_rec_hdr rec = { 0 };
  72         struct llog_rec_tail tail;
  73         int rc;
  74         ENTRY;
  75
  76         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
  77
  78         tail.lrt_len = rec.lrh_len = len;
  79         tail.lrt_index = rec.lrh_index = index;
  80         rec.lrh_type = LLOG_PAD_MAGIC;
  81
  82         rc = fsfilt_write_record(obd, file, &rec, sizeof(rec), &file->f_pos, 0);
  83         if (rc) {
  84                 CERROR("error writing padding record: rc %d\n", rc);
  85                 goto out;
  86         }
  87
  88         file->f_pos += len - sizeof(rec) - sizeof(tail);
  89         rc = fsfilt_write_record(obd, file, &tail, sizeof(tail),&file->f_pos,0);
  90         if (rc) {
  91                 CERROR("error writing padding record: rc %d\n", rc);
  92                 goto out;
  93         }
  94
  95  out:
  96         RETURN(rc);
  97 }
  98
  99 static int llog_lvfs_write_blob(struct obd_device *obd, struct l_file *file,
 100                                 struct llog_rec_hdr *rec, void *buf, loff_t off)
 101 {
 102         int rc;
 103         struct llog_rec_tail end;
 104         loff_t saved_off = file->f_pos;
 105         int buflen = rec->lrh_len;
 106
 107         ENTRY;
 108
 109         file->f_pos = off;
 110
 111         if (buflen == 0)
 112                 CWARN("0-length record\n");
 113
 114         if (!buf) {
 115                 rc = fsfilt_write_record(obd, file, rec, buflen,&file->f_pos,0);
 116                 if (rc) {
 117                         CERROR("error writing log record: rc %d\n", rc);
 118                         goto out;
 119                 }
 120                 GOTO(out, rc = 0);
 121         }
 122
 123         /* the buf case */
 124         rec->lrh_len = sizeof(*rec) + buflen + sizeof(end);
 125         rc = fsfilt_write_record(obd, file, rec, sizeof(*rec), &file->f_pos, 0);
 126         if (rc) {
 127                 CERROR("error writing log hdr: rc %d\n", rc);
 128                 goto out;
 129         }
 130
 131         rc = fsfilt_write_record(obd, file, buf, buflen, &file->f_pos, 0);
 132         if (rc) {
 133                 CERROR("error writing log buffer: rc %d\n", rc);
 134                 goto out;
 135         }
 136
 137         end.lrt_len = rec->lrh_len;
 138         end.lrt_index = rec->lrh_index;
 139         rc = fsfilt_write_record(obd, file, &end, sizeof(end), &file->f_pos, 0);
 140         if (rc) {
 141                 CERROR("error writing log tail: rc %d\n", rc);
 142                 goto out;
 143         }
 144
 145         rc = 0;
 146  out:
 147         if (saved_off > file->f_pos)
 148                 file->f_pos = saved_off;
 149         LASSERT(rc <= 0);
 150         RETURN(rc);
 151 }
 152
 153 static int llog_lvfs_read_blob(struct obd_device *obd, struct l_file *file,
 154                                 void *buf, int size, loff_t off)
 155 {
 156         loff_t offset = off;
 157         int rc;
 158         ENTRY;
 159
 160         rc = fsfilt_read_record(obd, file, buf, size, &offset);
 161         if (rc) {
 162                 CERROR("error reading log record: rc %d\n", rc);
 163                 RETURN(rc);
 164         }
 165         RETURN(0);
 166 }
 167
 168 static int llog_lvfs_read_header(struct llog_handle *handle)
 169 {
 170         struct obd_device *obd;
 171         int rc;
 172         ENTRY;
 173
 174         LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
 175
 176         obd = handle->lgh_ctxt->loc_exp->exp_obd;
 177
 178         if (i_size_read(handle->lgh_file->f_dentry->d_inode) == 0) {
 179                 CDEBUG(D_HA, "not reading header from 0-byte log\n");
 180                 RETURN(LLOG_EEMPTY);
 181         }
 182
 183         rc = llog_lvfs_read_blob(obd, handle->lgh_file, handle->lgh_hdr,
 184                                  LLOG_CHUNK_SIZE, 0);
 185         if (rc) {
 186                 CERROR("error reading log header from %.*s\n",
 187                        handle->lgh_file->f_dentry->d_name.len,
 188                        handle->lgh_file->f_dentry->d_name.name);
 189         } else {
 190                 struct llog_rec_hdr *llh_hdr = &handle->lgh_hdr->llh_hdr;
 191
 192                 if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
 193                         lustre_swab_llog_hdr(handle->lgh_hdr);
 194
 195                 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 196                         CERROR("bad log %.*s header magic: %#x (expected %#x)\n",
 197                                handle->lgh_file->f_dentry->d_name.len,
 198                                handle->lgh_file->f_dentry->d_name.name,
 199                                llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 200                         rc = -EIO;
 201                 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 202                         CERROR("incorrectly sized log %.*s header: %#x "
 203                                "(expected %#x)\n",
 204                                handle->lgh_file->f_dentry->d_name.len,
 205                                handle->lgh_file->f_dentry->d_name.name,
 206                                llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 207                         CERROR("you may need to re-run lconf --write_conf.\n");
 208                         rc = -EIO;
 209                 }
 210         }
 211
 212         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 213         handle->lgh_file->f_pos = i_size_read(handle->lgh_file->f_dentry->d_inode);
 214
 215         RETURN(rc);
 216 }
 217
 218 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 219 /* appends if idx == -1, otherwise overwrites record idx. */
 220 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 221                                struct llog_rec_hdr *rec,
 222                                struct llog_cookie *reccookie, int cookiecount,
 223                                void *buf, int idx)
 224 {
 225         struct llog_log_hdr *llh;
 226         int reclen = rec->lrh_len, index, rc;
 227         struct llog_rec_tail *lrt;
 228         struct obd_device *obd;
 229         struct file *file;
 230         size_t left;
 231         ENTRY;
 232
 233         llh = loghandle->lgh_hdr;
 234         file = loghandle->lgh_file;
 235         obd = loghandle->lgh_ctxt->loc_exp->exp_obd;
 236
 237         /* record length should not bigger than LLOG_CHUNK_SIZE */
 238         if (buf)
 239                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
 240                       sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 241         else
 242                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 243         if (rc)
 244                 RETURN(rc);
 245
 246         if (buf)
 247                 /* write_blob adds header and tail to lrh_len. */
 248                 reclen = sizeof(*rec) + rec->lrh_len +
 249                          sizeof(struct llog_rec_tail);
 250
 251         if (idx != -1) {
 252                 loff_t saved_offset;
 253
 254                 /* no header: only allowed to insert record 1 */
 255                 if (idx != 1 && !i_size_read(file->f_dentry->d_inode)) {
 256                         CERROR("idx != -1 in empty log\n");
 257                         LBUG();
 258                 }
 259
 260                 if (idx && llh->llh_size && llh->llh_size != rec->lrh_len)
 261                         RETURN(-EINVAL);
 262
 263                 if (!ext2_test_bit(idx, llh->llh_bitmap))
 264                         CERROR("Modify unset record %u\n", idx);
 265                 if (idx != rec->lrh_index)
 266                         CERROR("Index mismatch %d %u\n", idx, rec->lrh_index);
 267
 268                 rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 269                 /* we are done if we only write the header or on error */
 270                 if (rc || idx == 0)
 271                         RETURN(rc);
 272
 273                 /* Assumes constant lrh_len */
 274                 saved_offset = sizeof(*llh) + (idx - 1) * reclen;
 275
 276                 if (buf) {
 277                         struct llog_rec_hdr check;
 278
 279                         /* We assume that caller has set lgh_cur_* */
 280                         saved_offset = loghandle->lgh_cur_offset;
 281                         CDEBUG(D_OTHER,
 282                                "modify record "LPX64": idx:%d/%u/%d, len:%u "
 283                                "offset %llu\n",
 284                                loghandle->lgh_id.lgl_oid, idx, rec->lrh_index,
 285                                loghandle->lgh_cur_idx, rec->lrh_len,
 286                                (long long)(saved_offset - sizeof(*llh)));
 287                         if (rec->lrh_index != loghandle->lgh_cur_idx) {
 288                                 CERROR("modify idx mismatch %u/%d\n",
 289                                        idx, loghandle->lgh_cur_idx);
 290                                 RETURN(-EFAULT);
 291                         }
 292 #if 1  /* FIXME remove this safety check at some point */
 293                         /* Verify that the record we're modifying is the
 294                            right one. */
 295                         rc = llog_lvfs_read_blob(obd, file, &check,
 296                                                  sizeof(check), saved_offset);
 297                         if (check.lrh_index != idx || check.lrh_len != reclen) {
 298                                 CERROR("Bad modify idx %u/%u size %u/%u (%d)\n",
 299                                        idx, check.lrh_index, reclen,
 300                                        check.lrh_len, rc);
 301                                 RETURN(-EFAULT);
 302                         }
 303 #endif
 304                 }
 305
 306                 rc = llog_lvfs_write_blob(obd, file, rec, buf, saved_offset);
 307                 if (rc == 0 && reccookie) {
 308                         reccookie->lgc_lgl = loghandle->lgh_id;
 309                         reccookie->lgc_index = idx;
 310                         rc = 1;
 311                 }
 312                 RETURN(rc);
 313         }
 314
 315         /* Make sure that records don't cross a chunk boundary, so we can
 316          * process them page-at-a-time if needed.  If it will cross a chunk
 317          * boundary, write in a fake (but referenced) entry to pad the chunk.
 318          *
 319          * We know that llog_current_log() will return a loghandle that is
 320          * big enough to hold reclen, so all we care about is padding here.
 321          */
 322         left = LLOG_CHUNK_SIZE - (file->f_pos & (LLOG_CHUNK_SIZE - 1));
 323
 324         /* NOTE: padding is a record, but no bit is set */
 325         if (left != 0 && left != reclen &&
 326             left < (reclen + LLOG_MIN_REC_SIZE)) {
 327                  index = loghandle->lgh_last_idx + 1;
 328                  rc = llog_lvfs_pad(obd, file, left, index);
 329                  if (rc)
 330                          RETURN(rc);
 331                  loghandle->lgh_last_idx++; /*for pad rec*/
 332          }
 333          /* if it's the last idx in log file, then return -ENOSPC */
 334          if (loghandle->lgh_last_idx >= LLOG_BITMAP_SIZE(llh) - 1)
 335                  RETURN(-ENOSPC);
 336         loghandle->lgh_last_idx++;
 337         index = loghandle->lgh_last_idx;
 338         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 339         rec->lrh_index = index;
 340         if (buf == NULL) {
 341                 lrt = (struct llog_rec_tail *)
 342                         ((char *)rec + rec->lrh_len - sizeof(*lrt));
 343                 lrt->lrt_len = rec->lrh_len;
 344                 lrt->lrt_index = rec->lrh_index;
 345         }
 346         /*The caller should make sure only 1 process access the lgh_last_idx,
 347          *Otherwise it might hit the assert.*/
 348         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 349         if (ext2_set_bit(index, llh->llh_bitmap)) {
 350                 CERROR("argh, index %u already set in log bitmap?\n", index);
 351                 LBUG(); /* should never happen */
 352         }
 353         llh->llh_count++;
 354         llh->llh_tail.lrt_index = index;
 355
 356         rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 357         if (rc)
 358                 RETURN(rc);
 359
 360         rc = llog_lvfs_write_blob(obd, file, rec, buf, file->f_pos);
 361         if (rc)
 362                 RETURN(rc);
 363
 364         CDEBUG(D_RPCTRACE, "added record "LPX64": idx: %u, %u \n",
 365                loghandle->lgh_id.lgl_oid, index, rec->lrh_len);
 366         if (rc == 0 && reccookie) {
 367                 reccookie->lgc_lgl = loghandle->lgh_id;
 368                 reccookie->lgc_index = index;
 369                 if ((rec->lrh_type == MDS_UNLINK_REC) ||
 370                                 (rec->lrh_type == MDS_SETATTR_REC))
 371                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 372                 else if (rec->lrh_type == OST_SZ_REC)
 373                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 374                 else if (rec->lrh_type == OST_RAID1_REC)
 375                         reccookie->lgc_subsys = LLOG_RD1_ORIG_CTXT;
 376                 else
 377                         reccookie->lgc_subsys = -1;
 378                 rc = 1;
 379         }
 380         if (rc == 0 && rec->lrh_type == LLOG_GEN_REC)
 381                 rc = 1;
 382
 383         RETURN(rc);
 384 }
 385
 386 /* We can skip reading at least as many log blocks as the number of
 387 * minimum sized log records we are skipping.  If it turns out
 388 * that we are not far enough along the log (because the
 389 * actual records are larger than minimum size) we just skip
 390 * some more records. */
 391
 392 static void llog_skip_over(__u64 *off, int curr, int goal)
 393 {
 394         if (goal <= curr)
 395                 return;
 396         *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
 397                 ~(LLOG_CHUNK_SIZE - 1);
 398 }
 399
 400
 401 /* sets:
 402  *  - cur_offset to the furthest point read in the log file
 403  *  - cur_idx to the log index preceeding cur_offset
 404  * returns -EIO/-EINVAL on error
 405  */
 406 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 407                                 int next_idx, __u64 *cur_offset, void *buf,
 408                                 int len)
 409 {
 410         int rc;
 411         ENTRY;
 412
 413         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 414                 RETURN(-EINVAL);
 415
 416         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 417                next_idx, *cur_idx, *cur_offset);
 418
 419         while (*cur_offset < i_size_read(loghandle->lgh_file->f_dentry->d_inode)) {
 420                 struct llog_rec_hdr *rec;
 421                 struct llog_rec_tail *tail;
 422                 loff_t ppos;
 423
 424                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 425
 426                 ppos = *cur_offset;
 427                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 428                                         loghandle->lgh_file, buf, len,
 429                                         &ppos);
 430                 if (rc) {
 431                         CERROR("Cant read llog block at log id "LPU64
 432                                "/%u offset "LPU64"\n",
 433                                loghandle->lgh_id.lgl_oid,
 434                                loghandle->lgh_id.lgl_ogen,
 435                                *cur_offset);
 436                         RETURN(rc);
 437                 }
 438
 439                 /* put number of bytes read into rc to make code simpler */
 440                 rc = ppos - *cur_offset;
 441                 *cur_offset = ppos;
 442
 443                 if (rc < len) {
 444                         /* signal the end of the valid buffer to llog_process */
 445                         memset(buf + rc, 0, len - rc);
 446                 }
 447
 448                 if (rc == 0) /* end of file, nothing to do */
 449                         RETURN(0);
 450
 451                 if (rc < sizeof(*tail)) {
 452                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 453                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 454                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 455                         RETURN(-EINVAL);
 456                 }
 457
 458                 rec = buf;
 459                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 460                                                 sizeof(struct llog_rec_tail));
 461
 462                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec)) {
 463                         lustre_swab_llog_rec(rec, tail);
 464                 }
 465
 466                 *cur_idx = tail->lrt_index;
 467
 468                 /* this shouldn't happen */
 469                 if (tail->lrt_index == 0) {
 470                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 471                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 472                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 473                         RETURN(-EINVAL);
 474                 }
 475                 if (tail->lrt_index < next_idx)
 476                         continue;
 477
 478                 /* sanity check that the start of the new buffer is no farther
 479                  * than the record that we wanted.  This shouldn't happen. */
 480                 if (rec->lrh_index > next_idx) {
 481                         CERROR("missed desired record? %u > %u\n",
 482                                rec->lrh_index, next_idx);
 483                         RETURN(-ENOENT);
 484                 }
 485                 RETURN(0);
 486         }
 487         RETURN(-EIO);
 488 }
 489
 490 static int llog_lvfs_prev_block(struct llog_handle *loghandle,
 491                                 int prev_idx, void *buf, int len)
 492 {
 493         __u64 cur_offset;
 494         int rc;
 495         ENTRY;
 496
 497         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 498                 RETURN(-EINVAL);
 499
 500         CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
 501
 502         cur_offset = LLOG_CHUNK_SIZE;
 503         llog_skip_over(&cur_offset, 0, prev_idx);
 504
 505         while (cur_offset < i_size_read(loghandle->lgh_file->f_dentry->d_inode)) {
 506                 struct llog_rec_hdr *rec;
 507                 struct llog_rec_tail *tail;
 508                 loff_t ppos;
 509
 510                 ppos = cur_offset;
 511
 512                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 513                                         loghandle->lgh_file, buf, len,
 514                                         &ppos);
 515                 if (rc) {
 516                         CERROR("Cant read llog block at log id "LPU64
 517                                "/%u offset "LPU64"\n",
 518                                loghandle->lgh_id.lgl_oid,
 519                                loghandle->lgh_id.lgl_ogen,
 520                                cur_offset);
 521                         RETURN(rc);
 522                 }
 523
 524                 /* put number of bytes read into rc to make code simpler */
 525                 rc = ppos - cur_offset;
 526                 cur_offset = ppos;
 527
 528                 if (rc == 0) /* end of file, nothing to do */
 529                         RETURN(0);
 530
 531                 if (rc < sizeof(*tail)) {
 532                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 533                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 534                                loghandle->lgh_id.lgl_ogen, cur_offset);
 535                         RETURN(-EINVAL);
 536                 }
 537
 538                 tail = buf + rc - sizeof(struct llog_rec_tail);
 539
 540                 /* this shouldn't happen */
 541                 if (tail->lrt_index == 0) {
 542                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 543                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 544                                loghandle->lgh_id.lgl_ogen, cur_offset);
 545                         RETURN(-EINVAL);
 546                 }
 547                 if (le32_to_cpu(tail->lrt_index) < prev_idx)
 548                         continue;
 549
 550                 /* sanity check that the start of the new buffer is no farther
 551                  * than the record that we wanted.  This shouldn't happen. */
 552                 rec = buf;
 553                 if (le32_to_cpu(rec->lrh_index) > prev_idx) {
 554                         CERROR("missed desired record? %u > %u\n",
 555                                le32_to_cpu(rec->lrh_index), prev_idx);
 556                         RETURN(-ENOENT);
 557                 }
 558                 RETURN(0);
 559         }
 560         RETURN(-EIO);
 561 }
 562
 563 static struct file *llog_filp_open(char *dir, char *name, int flags, int mode)
 564 {
 565         char *logname;
 566         struct file *filp;
 567         int len;
 568
 569         OBD_ALLOC(logname, PATH_MAX);
 570         if (logname == NULL)
 571                 return ERR_PTR(-ENOMEM);
 572
 573         len = snprintf(logname, PATH_MAX, "%s/%s", dir, name);
 574         if (len >= PATH_MAX - 1) {
 575                 filp = ERR_PTR(-ENAMETOOLONG);
 576         } else {
 577                 filp = l_filp_open(logname, flags, mode);
 578                 if (IS_ERR(filp))
 579                         CERROR("logfile creation %s: %ld\n", logname,
 580                                PTR_ERR(filp));
 581         }
 582         OBD_FREE(logname, PATH_MAX);
 583         return filp;
 584 }
 585
 586 /* This is a callback from the llog_* functions.
 587  * Assumes caller has already pushed us into the kernel context. */
 588 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 589                             struct llog_logid *logid, char *name)
 590 {
 591         struct llog_handle *handle;
 592         struct obd_device *obd;
 593         struct l_dentry *dchild = NULL;
 594         struct obdo *oa = NULL;
 595         int rc = 0;
 596         int open_flags = O_RDWR | O_CREAT | O_LARGEFILE;
 597         ENTRY;
 598
 599         handle = llog_alloc_handle();
 600         if (handle == NULL)
 601                 RETURN(-ENOMEM);
 602         *res = handle;
 603
 604         LASSERT(ctxt);
 605         LASSERT(ctxt->loc_exp);
 606         obd = ctxt->loc_exp->exp_obd;
 607
 608         if (logid != NULL) {
 609                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, logid->lgl_oid,
 610                                              logid->lgl_ogen, logid->lgl_ogr);
 611
 612                 if (IS_ERR(dchild)) {
 613                         rc = PTR_ERR(dchild);
 614                         CERROR("error looking up logfile "LPX64":0x%x: rc %d\n",
 615                                logid->lgl_oid, logid->lgl_ogen, rc);
 616                         GOTO(out, rc);
 617                 }
 618
 619                 if (dchild->d_inode == NULL) {
 620                         l_dput(dchild);
 621                         rc = -ENOENT;
 622                         CERROR("nonexistent log file "LPX64":"LPX64": rc %d\n",
 623                                logid->lgl_oid, logid->lgl_ogr, rc);
 624                         GOTO(out, rc);
 625                 }
 626
 627                 /* l_dentry_open will call dput(dchild) if there is an error */
 628                 handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 629                                                     O_RDWR | O_LARGEFILE);
 630                 if (IS_ERR(handle->lgh_file)) {
 631                         rc = PTR_ERR(handle->lgh_file);
 632                         CERROR("error opening logfile "LPX64"0x%x: rc %d\n",
 633                                logid->lgl_oid, logid->lgl_ogen, rc);
 634                         GOTO(out, rc);
 635                 }
 636
 637                 /* assign the value of lgh_id for handle directly */
 638                 handle->lgh_id = *logid;
 639
 640         } else if (name) {
 641                 handle->lgh_file = llog_filp_open(MOUNT_CONFIGS_DIR,
 642                                                   name, open_flags, 0644);
 643                 if (IS_ERR(handle->lgh_file))
 644                         GOTO(out, rc = PTR_ERR(handle->lgh_file));
 645
 646                 handle->lgh_id.lgl_ogr = 1;
 647                 handle->lgh_id.lgl_oid =
 648                         handle->lgh_file->f_dentry->d_inode->i_ino;
 649                 handle->lgh_id.lgl_ogen =
 650                         handle->lgh_file->f_dentry->d_inode->i_generation;
 651         } else {
 652                 OBDO_ALLOC(oa);
 653                 if (oa == NULL)
 654                         GOTO(out, rc = -ENOMEM);
 655
 656                 oa->o_gr = FILTER_GROUP_LLOG;
 657                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 658
 659                 rc = obd_create(ctxt->loc_exp, oa, NULL, NULL);
 660                 if (rc)
 661                         GOTO(out, rc);
 662
 663                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, oa->o_id,
 664                                              oa->o_generation, oa->o_gr);
 665
 666                 if (IS_ERR(dchild))
 667                         GOTO(out, rc = PTR_ERR(dchild));
 668
 669                 handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 670                                                  open_flags);
 671                 if (IS_ERR(handle->lgh_file))
 672                         GOTO(out, rc = PTR_ERR(handle->lgh_file));
 673
 674                 handle->lgh_id.lgl_ogr = oa->o_gr;
 675                 handle->lgh_id.lgl_oid = oa->o_id;
 676                 handle->lgh_id.lgl_ogen = oa->o_generation;
 677         }
 678
 679         handle->lgh_ctxt = ctxt;
 680 out:
 681         if (rc)
 682                 llog_free_handle(handle);
 683
 684         if (oa)
 685                 OBDO_FREE(oa);
 686         RETURN(rc);
 687 }
 688
 689 static int llog_lvfs_close(struct llog_handle *handle)
 690 {
 691         int rc;
 692         ENTRY;
 693
 694         rc = filp_close(handle->lgh_file, 0);
 695         if (rc)
 696                 CERROR("error closing log: rc %d\n", rc);
 697         RETURN(rc);
 698 }
 699
 700 static int llog_lvfs_destroy(struct llog_handle *handle)
 701 {
 702         struct dentry *fdentry;
 703         struct obdo *oa;
 704         struct obd_device *obd = handle->lgh_ctxt->loc_exp->exp_obd;
 705         char *dir;
 706         int rc;
 707         ENTRY;
 708
 709         dir = MOUNT_CONFIGS_DIR;
 710
 711         fdentry = handle->lgh_file->f_dentry;
 712         if (strcmp(fdentry->d_parent->d_name.name, dir) == 0) {
 713                 struct inode *inode = fdentry->d_parent->d_inode;
 714                 struct lvfs_run_ctxt saved;
 715                 struct vfsmount *mnt = mntget(handle->lgh_file->f_vfsmnt);
 716
 717                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 718                 dget(fdentry);
 719                 rc = llog_lvfs_close(handle);
 720
 721                 if (rc == 0) {
 722                         LOCK_INODE_MUTEX_PARENT(inode);
 723                         rc = ll_vfs_unlink(inode, fdentry, mnt);
 724                         UNLOCK_INODE_MUTEX(inode);
 725                 }
 726                 mntput(mnt);
 727
 728                 dput(fdentry);
 729                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 730                 RETURN(rc);
 731         }
 732
 733         OBDO_ALLOC(oa);
 734         if (oa == NULL)
 735                 RETURN(-ENOMEM);
 736
 737         oa->o_id = handle->lgh_id.lgl_oid;
 738         oa->o_gr = handle->lgh_id.lgl_ogr;
 739         oa->o_generation = handle->lgh_id.lgl_ogen;
 740         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 741
 742         rc = llog_lvfs_close(handle);
 743         if (rc)
 744                 GOTO(out, rc);
 745
 746         rc = obd_destroy(handle->lgh_ctxt->loc_exp, oa, NULL, NULL, NULL, NULL);
 747  out:
 748         OBDO_FREE(oa);
 749         RETURN(rc);
 750 }
 751
 752 /* reads the catalog list */
 753 int llog_get_cat_list(struct obd_device *disk_obd,
 754                       char *name, int idx, int count, struct llog_catid *idarray)
 755 {
 756         struct lvfs_run_ctxt saved;
 757         struct l_file *file;
 758         int rc, rc1 = 0;
 759         int size = sizeof(*idarray) * count;
 760         loff_t off = idx *  sizeof(*idarray);
 761         ENTRY;
 762
 763         if (!count)
 764                 RETURN(0);
 765
 766         push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 767         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 768         if (!file || IS_ERR(file)) {
 769                 rc = PTR_ERR(file);
 770                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 771                        name, rc);
 772                 GOTO(out, rc);
 773         }
 774
 775         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 776                 CERROR("%s is not a regular file!: mode = %o\n", name,
 777                        file->f_dentry->d_inode->i_mode);
 778                 GOTO(out, rc = -ENOENT);
 779         }
 780
 781         CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
 782                (int)i_size_read(file->f_dentry->d_inode), size);
 783
 784         /* read for new ost index or for empty file */
 785         memset(idarray, 0, size);
 786         if (i_size_read(file->f_dentry->d_inode) < off)
 787                 GOTO(out, rc = 0);
 788
 789         rc = fsfilt_read_record(disk_obd, file, idarray, size, &off);
 790         if (rc) {
 791                 CERROR("OBD filter: error reading %s: rc %d\n", name, rc);
 792                 GOTO(out, rc);
 793         }
 794
 795         EXIT;
 796  out:
 797         pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 798         if (file && !IS_ERR(file))
 799                 rc1 = filp_close(file, 0);
 800         if (rc == 0)
 801                 rc = rc1;
 802         return rc;
 803 }
 804 EXPORT_SYMBOL(llog_get_cat_list);
 805
 806 /* writes the cat list */
 807 int llog_put_cat_list(struct obd_device *disk_obd,
 808                       char *name, int idx, int count, struct llog_catid *idarray)
 809 {
 810         struct lvfs_run_ctxt saved;
 811         struct l_file *file;
 812         int rc, rc1 = 0;
 813         int size = sizeof(*idarray) * count;
 814         loff_t off = idx * sizeof(*idarray);
 815
 816         if (!count)
 817                 GOTO(out1, rc = 0);
 818
 819         push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 820         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 821         if (!file || IS_ERR(file)) {
 822                 rc = PTR_ERR(file);
 823                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 824                        name, rc);
 825                 GOTO(out, rc);
 826         }
 827
 828         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 829                 CERROR("%s is not a regular file!: mode = %o\n", name,
 830                        file->f_dentry->d_inode->i_mode);
 831                 GOTO(out, rc = -ENOENT);
 832         }
 833
 834         rc = fsfilt_write_record(disk_obd, file, idarray, size, &off, 1);
 835         if (rc) {
 836                 CDEBUG(D_INODE,"OBD filter: error writeing %s: rc %d\n",
 837                        name, rc);
 838                 GOTO(out, rc);
 839         }
 840
 841 out:
 842         pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 843         if (file && !IS_ERR(file))
 844                 rc1 = filp_close(file, 0);
 845
 846         if (rc == 0)
 847                 rc = rc1;
 848 out1:
 849         RETURN(rc);
 850 }
 851 EXPORT_SYMBOL(llog_put_cat_list);
 852
 853 struct llog_operations llog_lvfs_ops = {
 854         lop_write_rec:   llog_lvfs_write_rec,
 855         lop_next_block:  llog_lvfs_next_block,
 856         lop_prev_block:  llog_lvfs_prev_block,
 857         lop_read_header: llog_lvfs_read_header,
 858         lop_create:      llog_lvfs_create,
 859         lop_destroy:     llog_lvfs_destroy,
 860         lop_close:       llog_lvfs_close,
 861         //        lop_cancel: llog_lvfs_cancel,
 862 };
 863
 864 EXPORT_SYMBOL(llog_lvfs_ops);
 865
 866 #else /* !__KERNEL__ */
 867
 868 static int llog_lvfs_read_header(struct llog_handle *handle)
 869 {
 870         LBUG();
 871         return 0;
 872 }
 873
 874 static int llog_lvfs_write_rec(struct llog_handle *loghandle,
 875                                struct llog_rec_hdr *rec,
 876                                struct llog_cookie *reccookie, int cookiecount,
 877                                void *buf, int idx)
 878 {
 879         LBUG();
 880         return 0;
 881 }
 882
 883 static int llog_lvfs_next_block(struct llog_handle *loghandle, int *cur_idx,
 884                                 int next_idx, __u64 *cur_offset, void *buf,
 885                                 int len)
 886 {
 887         LBUG();
 888         return 0;
 889 }
 890
 891 static int llog_lvfs_prev_block(struct llog_handle *loghandle,
 892                                 int prev_idx, void *buf, int len)
 893 {
 894         LBUG();
 895         return 0;
 896 }
 897
 898 static int llog_lvfs_create(struct llog_ctxt *ctxt, struct llog_handle **res,
 899                             struct llog_logid *logid, char *name)
 900 {
 901         LBUG();
 902         return 0;
 903 }
 904
 905 static int llog_lvfs_close(struct llog_handle *handle)
 906 {
 907         LBUG();
 908         return 0;
 909 }
 910
 911 static int llog_lvfs_destroy(struct llog_handle *handle)
 912 {
 913         LBUG();
 914         return 0;
 915 }
 916
 917 int llog_get_cat_list(struct obd_device *disk_obd,
 918                       char *name, int idx, int count, struct llog_catid *idarray)
 919 {
 920         LBUG();
 921         return 0;
 922 }
 923
 924 int llog_put_cat_list(struct obd_device *disk_obd,
 925                       char *name, int idx, int count, struct llog_catid *idarray)
 926 {
 927         LBUG();
 928         return 0;
 929 }
 930
 931 struct llog_operations llog_lvfs_ops = {
 932         lop_write_rec:   llog_lvfs_write_rec,
 933         lop_next_block:  llog_lvfs_next_block,
 934         lop_prev_block:  llog_lvfs_prev_block,
 935         lop_read_header: llog_lvfs_read_header,
 936         lop_create:      llog_lvfs_create,
 937         lop_destroy:     llog_lvfs_destroy,
 938         lop_close:       llog_lvfs_close,
 939 //        lop_cancel:      llog_lvfs_cancel,
 940 };
 941 #endif