lustre/obdclass/llog_lvfs.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  *
  34  * lustre/obdclass/llog_lvfs.c
  35  *
  36  * OST<->MDS recovery logging infrastructure.
  37  * Invariants in implementation:
  38  * - we do not share logs among different OST<->MDS connections, so that
  39  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  40  *
  41  * Author: Andreas Dilger <adilger@clusterfs.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_LOG
  45
  46 #ifndef __KERNEL__
  47 #include <liblustre.h>
  48 #endif
  49
  50 #include <obd.h>
  51 #include <obd_class.h>
  52 #include <lustre_log.h>
  53 #include <obd_ost.h>
  54 #include <libcfs/list.h>
  55 #include <lvfs.h>
  56 #include <lustre_fsfilt.h>
  57 #include <lustre_disk.h>
  58 #include "llog_internal.h"
  59
  60 #if defined(__KERNEL__) && defined(LLOG_LVFS)
  61
  62 static int llog_lvfs_pad(struct obd_device *obd, struct l_file *file,
  63                                 int len, int index)
  64 {
  65         struct llog_rec_hdr rec = { 0 };
  66         struct llog_rec_tail tail;
  67         int rc;
  68         ENTRY;
  69
  70         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
  71
  72         tail.lrt_len = rec.lrh_len = len;
  73         tail.lrt_index = rec.lrh_index = index;
  74         rec.lrh_type = LLOG_PAD_MAGIC;
  75
  76         rc = fsfilt_write_record(obd, file, &rec, sizeof(rec), &file->f_pos, 0);
  77         if (rc) {
  78                 CERROR("error writing padding record: rc %d\n", rc);
  79                 goto out;
  80         }
  81
  82         file->f_pos += len - sizeof(rec) - sizeof(tail);
  83         rc = fsfilt_write_record(obd, file, &tail, sizeof(tail),&file->f_pos,0);
  84         if (rc) {
  85                 CERROR("error writing padding record: rc %d\n", rc);
  86                 goto out;
  87         }
  88
  89  out:
  90         RETURN(rc);
  91 }
  92
  93 static int llog_lvfs_write_blob(struct obd_device *obd, struct l_file *file,
  94                                 struct llog_rec_hdr *rec, void *buf, loff_t off)
  95 {
  96         int rc;
  97         struct llog_rec_tail end;
  98         loff_t saved_off = file->f_pos;
  99         int buflen = rec->lrh_len;
 100
 101         ENTRY;
 102
 103         file->f_pos = off;
 104
 105         if (buflen == 0)
 106                 CWARN("0-length record\n");
 107
 108         if (!buf) {
 109                 rc = fsfilt_write_record(obd, file, rec, buflen,&file->f_pos,0);
 110                 if (rc) {
 111                         CERROR("error writing log record: rc %d\n", rc);
 112                         goto out;
 113                 }
 114                 GOTO(out, rc = 0);
 115         }
 116
 117         /* the buf case */
 118         rec->lrh_len = sizeof(*rec) + buflen + sizeof(end);
 119         rc = fsfilt_write_record(obd, file, rec, sizeof(*rec), &file->f_pos, 0);
 120         if (rc) {
 121                 CERROR("error writing log hdr: rc %d\n", rc);
 122                 goto out;
 123         }
 124
 125         rc = fsfilt_write_record(obd, file, buf, buflen, &file->f_pos, 0);
 126         if (rc) {
 127                 CERROR("error writing log buffer: rc %d\n", rc);
 128                 goto out;
 129         }
 130
 131         end.lrt_len = rec->lrh_len;
 132         end.lrt_index = rec->lrh_index;
 133         rc = fsfilt_write_record(obd, file, &end, sizeof(end), &file->f_pos, 0);
 134         if (rc) {
 135                 CERROR("error writing log tail: rc %d\n", rc);
 136                 goto out;
 137         }
 138
 139         rc = 0;
 140  out:
 141         if (saved_off > file->f_pos)
 142                 file->f_pos = saved_off;
 143         LASSERT(rc <= 0);
 144         RETURN(rc);
 145 }
 146
 147 static int llog_lvfs_read_blob(struct obd_device *obd, struct l_file *file,
 148                                 void *buf, int size, loff_t off)
 149 {
 150         loff_t offset = off;
 151         int rc;
 152         ENTRY;
 153
 154         rc = fsfilt_read_record(obd, file, buf, size, &offset);
 155         if (rc) {
 156                 CERROR("error reading log record: rc %d\n", rc);
 157                 RETURN(rc);
 158         }
 159         RETURN(0);
 160 }
 161
 162 static int llog_lvfs_read_header(const struct lu_env *env,
 163                                  struct llog_handle *handle)
 164 {
 165         struct obd_device *obd;
 166         int rc;
 167         ENTRY;
 168
 169         LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
 170
 171         obd = handle->lgh_ctxt->loc_exp->exp_obd;
 172
 173         if (i_size_read(handle->lgh_file->f_dentry->d_inode) == 0) {
 174                 CDEBUG(D_HA, "not reading header from 0-byte log\n");
 175                 RETURN(LLOG_EEMPTY);
 176         }
 177
 178         rc = llog_lvfs_read_blob(obd, handle->lgh_file, handle->lgh_hdr,
 179                                  LLOG_CHUNK_SIZE, 0);
 180         if (rc) {
 181                 CERROR("error reading log header from %.*s\n",
 182                        handle->lgh_file->f_dentry->d_name.len,
 183                        handle->lgh_file->f_dentry->d_name.name);
 184         } else {
 185                 struct llog_rec_hdr *llh_hdr = &handle->lgh_hdr->llh_hdr;
 186
 187                 if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
 188                         lustre_swab_llog_hdr(handle->lgh_hdr);
 189
 190                 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 191                         CERROR("bad log %.*s header magic: %#x (expected %#x)\n",
 192                                handle->lgh_file->f_dentry->d_name.len,
 193                                handle->lgh_file->f_dentry->d_name.name,
 194                                llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 195                         rc = -EIO;
 196                 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 197                         CERROR("incorrectly sized log %.*s header: %#x "
 198                                "(expected %#x)\n",
 199                                handle->lgh_file->f_dentry->d_name.len,
 200                                handle->lgh_file->f_dentry->d_name.name,
 201                                llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 202                         CERROR("you may need to re-run lconf --write_conf.\n");
 203                         rc = -EIO;
 204                 }
 205         }
 206
 207         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 208         handle->lgh_file->f_pos = i_size_read(handle->lgh_file->f_dentry->d_inode);
 209
 210         RETURN(rc);
 211 }
 212
 213 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 214 /* appends if idx == -1, otherwise overwrites record idx. */
 215 static int llog_lvfs_write_rec(const struct lu_env *env,
 216                                struct llog_handle *loghandle,
 217                                struct llog_rec_hdr *rec,
 218                                struct llog_cookie *reccookie, int cookiecount,
 219                                void *buf, int idx, struct thandle *th)
 220 {
 221         struct llog_log_hdr *llh;
 222         int reclen = rec->lrh_len, index, rc;
 223         struct llog_rec_tail *lrt;
 224         struct obd_device *obd;
 225         struct file *file;
 226         size_t left;
 227         ENTRY;
 228
 229         llh = loghandle->lgh_hdr;
 230         file = loghandle->lgh_file;
 231         obd = loghandle->lgh_ctxt->loc_exp->exp_obd;
 232
 233         /* record length should not bigger than LLOG_CHUNK_SIZE */
 234         if (buf)
 235                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
 236                       sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 237         else
 238                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 239         if (rc)
 240                 RETURN(rc);
 241
 242         if (buf)
 243                 /* write_blob adds header and tail to lrh_len. */
 244                 reclen = sizeof(*rec) + rec->lrh_len +
 245                          sizeof(struct llog_rec_tail);
 246
 247         if (idx != -1) {
 248                 loff_t saved_offset;
 249
 250                 /* no header: only allowed to insert record 1 */
 251                 if (idx != 1 && !i_size_read(file->f_dentry->d_inode)) {
 252                         CERROR("idx != -1 in empty log\n");
 253                         LBUG();
 254                 }
 255
 256                 if (idx && llh->llh_size && llh->llh_size != rec->lrh_len)
 257                         RETURN(-EINVAL);
 258
 259                 if (!ext2_test_bit(idx, llh->llh_bitmap))
 260                         CERROR("Modify unset record %u\n", idx);
 261                 if (idx != rec->lrh_index)
 262                         CERROR("Index mismatch %d %u\n", idx, rec->lrh_index);
 263
 264                 rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 265                 /* we are done if we only write the header or on error */
 266                 if (rc || idx == 0)
 267                         RETURN(rc);
 268
 269                 if (buf) {
 270                         /* We assume that caller has set lgh_cur_* */
 271                         saved_offset = loghandle->lgh_cur_offset;
 272                         CDEBUG(D_OTHER,
 273                                "modify record "LPX64": idx:%d/%u/%d, len:%u "
 274                                "offset %llu\n",
 275                                loghandle->lgh_id.lgl_oid, idx, rec->lrh_index,
 276                                loghandle->lgh_cur_idx, rec->lrh_len,
 277                                (long long)(saved_offset - sizeof(*llh)));
 278                         if (rec->lrh_index != loghandle->lgh_cur_idx) {
 279                                 CERROR("modify idx mismatch %u/%d\n",
 280                                        idx, loghandle->lgh_cur_idx);
 281                                 RETURN(-EFAULT);
 282                         }
 283                 } else {
 284                         /* Assumes constant lrh_len */
 285                         saved_offset = sizeof(*llh) + (idx - 1) * reclen;
 286                 }
 287
 288                 rc = llog_lvfs_write_blob(obd, file, rec, buf, saved_offset);
 289                 if (rc == 0 && reccookie) {
 290                         reccookie->lgc_lgl = loghandle->lgh_id;
 291                         reccookie->lgc_index = idx;
 292                         rc = 1;
 293                 }
 294                 RETURN(rc);
 295         }
 296
 297         /* Make sure that records don't cross a chunk boundary, so we can
 298          * process them page-at-a-time if needed.  If it will cross a chunk
 299          * boundary, write in a fake (but referenced) entry to pad the chunk.
 300          *
 301          * We know that llog_current_log() will return a loghandle that is
 302          * big enough to hold reclen, so all we care about is padding here.
 303          */
 304         left = LLOG_CHUNK_SIZE - (file->f_pos & (LLOG_CHUNK_SIZE - 1));
 305
 306         /* NOTE: padding is a record, but no bit is set */
 307         if (left != 0 && left != reclen &&
 308             left < (reclen + LLOG_MIN_REC_SIZE)) {
 309                  index = loghandle->lgh_last_idx + 1;
 310                  rc = llog_lvfs_pad(obd, file, left, index);
 311                  if (rc)
 312                          RETURN(rc);
 313                  loghandle->lgh_last_idx++; /*for pad rec*/
 314          }
 315          /* if it's the last idx in log file, then return -ENOSPC */
 316          if (loghandle->lgh_last_idx >= LLOG_BITMAP_SIZE(llh) - 1)
 317                  RETURN(-ENOSPC);
 318         loghandle->lgh_last_idx++;
 319         index = loghandle->lgh_last_idx;
 320         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 321         rec->lrh_index = index;
 322         if (buf == NULL) {
 323                 lrt = (struct llog_rec_tail *)
 324                         ((char *)rec + rec->lrh_len - sizeof(*lrt));
 325                 lrt->lrt_len = rec->lrh_len;
 326                 lrt->lrt_index = rec->lrh_index;
 327         }
 328         /*The caller should make sure only 1 process access the lgh_last_idx,
 329          *Otherwise it might hit the assert.*/
 330         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 331         cfs_spin_lock(&loghandle->lgh_hdr_lock);
 332         if (ext2_set_bit(index, llh->llh_bitmap)) {
 333                 CERROR("argh, index %u already set in log bitmap?\n", index);
 334                 cfs_spin_unlock(&loghandle->lgh_hdr_lock);
 335                 LBUG(); /* should never happen */
 336         }
 337         llh->llh_count++;
 338         cfs_spin_unlock(&loghandle->lgh_hdr_lock);
 339         llh->llh_tail.lrt_index = index;
 340
 341         rc = llog_lvfs_write_blob(obd, file, &llh->llh_hdr, NULL, 0);
 342         if (rc)
 343                 RETURN(rc);
 344
 345         rc = llog_lvfs_write_blob(obd, file, rec, buf, file->f_pos);
 346         if (rc)
 347                 RETURN(rc);
 348
 349         CDEBUG(D_RPCTRACE, "added record "LPX64": idx: %u, %u \n",
 350                loghandle->lgh_id.lgl_oid, index, rec->lrh_len);
 351         if (rc == 0 && reccookie) {
 352                 reccookie->lgc_lgl = loghandle->lgh_id;
 353                 reccookie->lgc_index = index;
 354                 if ((rec->lrh_type == MDS_UNLINK_REC) ||
 355                     (rec->lrh_type == MDS_SETATTR64_REC))
 356                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 357                 else if (rec->lrh_type == OST_SZ_REC)
 358                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 359                 else
 360                         reccookie->lgc_subsys = -1;
 361                 rc = 1;
 362         }
 363         if (rc == 0 && rec->lrh_type == LLOG_GEN_REC)
 364                 rc = 1;
 365
 366         RETURN(rc);
 367 }
 368
 369 /* We can skip reading at least as many log blocks as the number of
 370 * minimum sized log records we are skipping.  If it turns out
 371 * that we are not far enough along the log (because the
 372 * actual records are larger than minimum size) we just skip
 373 * some more records. */
 374
 375 static void llog_skip_over(__u64 *off, int curr, int goal)
 376 {
 377         if (goal <= curr)
 378                 return;
 379         *off = (*off + (goal-curr-1) * LLOG_MIN_REC_SIZE) &
 380                 ~(LLOG_CHUNK_SIZE - 1);
 381 }
 382
 383
 384 /* sets:
 385  *  - cur_offset to the furthest point read in the log file
 386  *  - cur_idx to the log index preceeding cur_offset
 387  * returns -EIO/-EINVAL on error
 388  */
 389 static int llog_lvfs_next_block(const struct lu_env *env,
 390                                 struct llog_handle *loghandle, int *cur_idx,
 391                                 int next_idx, __u64 *cur_offset, void *buf,
 392                                 int len)
 393 {
 394         int rc;
 395         ENTRY;
 396
 397         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 398                 RETURN(-EINVAL);
 399
 400         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 401                next_idx, *cur_idx, *cur_offset);
 402
 403         while (*cur_offset < i_size_read(loghandle->lgh_file->f_dentry->d_inode)) {
 404                 struct llog_rec_hdr *rec, *last_rec;
 405                 struct llog_rec_tail *tail;
 406                 loff_t ppos;
 407                 int llen;
 408
 409                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 410
 411                 /* read up to next LLOG_CHUNK_SIZE block */
 412                 ppos = *cur_offset;
 413                 llen = LLOG_CHUNK_SIZE - (*cur_offset & (LLOG_CHUNK_SIZE - 1));
 414                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 415                                         loghandle->lgh_file, buf, llen,
 416                                         cur_offset);
 417                 if (rc < 0) {
 418                         CERROR("Cant read llog block at log id "LPU64
 419                                "/%u offset "LPU64"\n",
 420                                loghandle->lgh_id.lgl_oid,
 421                                loghandle->lgh_id.lgl_ogen,
 422                                *cur_offset);
 423                         RETURN(rc);
 424                 }
 425
 426                 /* put number of bytes read into rc to make code simpler */
 427                 rc = *cur_offset - ppos;
 428                 if (rc < len) {
 429                         /* signal the end of the valid buffer to llog_process */
 430                         memset(buf + rc, 0, len - rc);
 431                 }
 432
 433                 if (rc == 0) /* end of file, nothing to do */
 434                         RETURN(0);
 435
 436                 if (rc < sizeof(*tail)) {
 437                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 438                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 439                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 440                         RETURN(-EINVAL);
 441                 }
 442
 443                 rec = buf;
 444                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 445                         lustre_swab_llog_rec(rec);
 446
 447                 tail = (struct llog_rec_tail *)(buf + rc -
 448                                                 sizeof(struct llog_rec_tail));
 449
 450                 /* get the last record in block */
 451                 last_rec = (struct llog_rec_hdr *)(buf + rc -
 452                                                    le32_to_cpu(tail->lrt_len));
 453
 454                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 455                         lustre_swab_llog_rec(last_rec);
 456                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 457
 458                 *cur_idx = tail->lrt_index;
 459
 460                 /* this shouldn't happen */
 461                 if (tail->lrt_index == 0) {
 462                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 463                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 464                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 465                         RETURN(-EINVAL);
 466                 }
 467                 if (tail->lrt_index < next_idx)
 468                         continue;
 469
 470                 /* sanity check that the start of the new buffer is no farther
 471                  * than the record that we wanted.  This shouldn't happen. */
 472                 if (rec->lrh_index > next_idx) {
 473                         CERROR("missed desired record? %u > %u\n",
 474                                rec->lrh_index, next_idx);
 475                         RETURN(-ENOENT);
 476                 }
 477                 RETURN(0);
 478         }
 479         RETURN(-EIO);
 480 }
 481
 482 static int llog_lvfs_prev_block(const struct lu_env *env,
 483                                 struct llog_handle *loghandle,
 484                                 int prev_idx, void *buf, int len)
 485 {
 486         __u64 cur_offset;
 487         int rc;
 488         ENTRY;
 489
 490         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 491                 RETURN(-EINVAL);
 492
 493         CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
 494
 495         cur_offset = LLOG_CHUNK_SIZE;
 496         llog_skip_over(&cur_offset, 0, prev_idx);
 497
 498         while (cur_offset < i_size_read(loghandle->lgh_file->f_dentry->d_inode)) {
 499                 struct llog_rec_hdr *rec, *last_rec;
 500                 struct llog_rec_tail *tail;
 501                 loff_t ppos = cur_offset;
 502
 503                 rc = fsfilt_read_record(loghandle->lgh_ctxt->loc_exp->exp_obd,
 504                                         loghandle->lgh_file, buf, len,
 505                                         &cur_offset);
 506                 if (rc < 0) {
 507                         CERROR("Cant read llog block at log id "LPU64
 508                                "/%u offset "LPU64"\n",
 509                                loghandle->lgh_id.lgl_oid,
 510                                loghandle->lgh_id.lgl_ogen,
 511                                cur_offset);
 512                         RETURN(rc);
 513                 }
 514
 515                 /* put number of bytes read into rc to make code simpler */
 516                 rc = cur_offset - ppos;
 517
 518                 if (rc == 0) /* end of file, nothing to do */
 519                         RETURN(0);
 520
 521                 if (rc < sizeof(*tail)) {
 522                         CERROR("Invalid llog block at log id "LPU64"/%u offset "
 523                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 524                                loghandle->lgh_id.lgl_ogen, cur_offset);
 525                         RETURN(-EINVAL);
 526                 }
 527
 528                 rec = buf;
 529                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 530                         lustre_swab_llog_rec(rec);
 531
 532                 tail = (struct llog_rec_tail *)(buf + rc -
 533                                                 sizeof(struct llog_rec_tail));
 534
 535                 /* get the last record in block */
 536                 last_rec = (struct llog_rec_hdr *)(buf + rc -
 537                                                    le32_to_cpu(tail->lrt_len));
 538
 539                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 540                         lustre_swab_llog_rec(last_rec);
 541                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 542
 543                 /* this shouldn't happen */
 544                 if (tail->lrt_index == 0) {
 545                         CERROR("Invalid llog tail at log id "LPU64"/%u offset "
 546                                LPU64"\n", loghandle->lgh_id.lgl_oid,
 547                                loghandle->lgh_id.lgl_ogen, cur_offset);
 548                         RETURN(-EINVAL);
 549                 }
 550                 if (tail->lrt_index < prev_idx)
 551                         continue;
 552
 553                 /* sanity check that the start of the new buffer is no farther
 554                  * than the record that we wanted.  This shouldn't happen. */
 555                 if (rec->lrh_index > prev_idx) {
 556                         CERROR("missed desired record? %u > %u\n",
 557                                rec->lrh_index, prev_idx);
 558                         RETURN(-ENOENT);
 559                 }
 560                 RETURN(0);
 561         }
 562         RETURN(-EIO);
 563 }
 564
 565 static struct file *llog_filp_open(char *dir, char *name, int flags, int mode)
 566 {
 567         char *logname;
 568         struct file *filp;
 569         int len;
 570
 571         OBD_ALLOC(logname, PATH_MAX);
 572         if (logname == NULL)
 573                 return ERR_PTR(-ENOMEM);
 574
 575         len = snprintf(logname, PATH_MAX, "%s/%s", dir, name);
 576         if (len >= PATH_MAX - 1) {
 577                 filp = ERR_PTR(-ENAMETOOLONG);
 578         } else {
 579                 filp = l_filp_open(logname, flags, mode);
 580                 if (IS_ERR(filp) && PTR_ERR(filp) != -ENOENT)
 581                         CERROR("logfile creation %s: %ld\n", logname,
 582                                PTR_ERR(filp));
 583         }
 584         OBD_FREE(logname, PATH_MAX);
 585         return filp;
 586 }
 587
 588 static int llog_lvfs_open(const struct lu_env *env,  struct llog_handle *handle,
 589                           struct llog_logid *logid, char *name,
 590                           enum llog_open_param open_param)
 591 {
 592         struct llog_ctxt        *ctxt = handle->lgh_ctxt;
 593         struct l_dentry         *dchild = NULL;
 594         struct obd_device       *obd;
 595         int                      rc = 0;
 596
 597         ENTRY;
 598
 599         LASSERT(ctxt);
 600         LASSERT(ctxt->loc_exp);
 601         LASSERT(ctxt->loc_exp->exp_obd);
 602         obd = ctxt->loc_exp->exp_obd;
 603
 604         LASSERT(handle);
 605         if (logid != NULL) {
 606                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, logid->lgl_oid,
 607                                              logid->lgl_ogen, logid->lgl_oseq);
 608                 if (IS_ERR(dchild)) {
 609                         rc = PTR_ERR(dchild);
 610                         CERROR("%s: error looking up logfile #"LPX64"#"
 611                                LPX64"#%08x: rc = %d\n",
 612                                ctxt->loc_obd->obd_name, logid->lgl_oid,
 613                                logid->lgl_oseq, logid->lgl_ogen, rc);
 614                         GOTO(out, rc);
 615                 }
 616                 if (dchild->d_inode == NULL) {
 617                         l_dput(dchild);
 618                         rc = -ENOENT;
 619                         CERROR("%s: nonexistent llog #"LPX64"#"LPX64"#%08x: "
 620                                "rc = %d\n", ctxt->loc_obd->obd_name,
 621                                logid->lgl_oid, logid->lgl_oseq,
 622                                logid->lgl_ogen, rc);
 623                         GOTO(out, rc);
 624                 }
 625                 /* l_dentry_open will call dput(dchild) if there is an error */
 626                 handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 627                                                  O_RDWR | O_LARGEFILE);
 628                 if (IS_ERR(handle->lgh_file)) {
 629                         rc = PTR_ERR(handle->lgh_file);
 630                         handle->lgh_file = NULL;
 631                         CERROR("%s: error opening llog #"LPX64"#"LPX64"#%08x: "
 632                                "rc = %d\n", ctxt->loc_obd->obd_name,
 633                                logid->lgl_oid, logid->lgl_oseq,
 634                                logid->lgl_ogen, rc);
 635                         GOTO(out, rc);
 636                 }
 637
 638                 handle->lgh_id = *logid;
 639         } else if (name) {
 640                 handle->lgh_file = llog_filp_open(MOUNT_CONFIGS_DIR, name,
 641                                                   O_RDWR | O_LARGEFILE, 0644);
 642                 if (IS_ERR(handle->lgh_file)) {
 643                         rc = PTR_ERR(handle->lgh_file);
 644                         handle->lgh_file = NULL;
 645                         if (rc == -ENOENT && open_param == LLOG_OPEN_NEW) {
 646                                 OBD_ALLOC(handle->lgh_name, strlen(name) + 1);
 647                                 if (handle->lgh_name)
 648                                         strcpy(handle->lgh_name, name);
 649                                 else
 650                                         GOTO(out, rc = -ENOMEM);
 651                                 rc = 0;
 652                         } else {
 653                                 GOTO(out, rc);
 654                         }
 655                 } else {
 656                         handle->lgh_id.lgl_oseq = FID_SEQ_LLOG;
 657                         handle->lgh_id.lgl_oid =
 658                                 handle->lgh_file->f_dentry->d_inode->i_ino;
 659                         handle->lgh_id.lgl_ogen =
 660                                 handle->lgh_file->f_dentry->d_inode->i_generation;
 661                 }
 662         } else {
 663                 LASSERTF(open_param == LLOG_OPEN_NEW, "%#x\n", open_param);
 664                 handle->lgh_file = NULL;
 665         }
 666
 667         /* No new llog is expected but doesn't exist */
 668         if (open_param != LLOG_OPEN_NEW && handle->lgh_file == NULL)
 669                 GOTO(out_name, rc = -ENOENT);
 670
 671         RETURN(0);
 672 out_name:
 673         if (handle->lgh_name != NULL)
 674                 OBD_FREE(handle->lgh_name, strlen(name) + 1);
 675 out:
 676         RETURN(rc);
 677 }
 678
 679 static int llog_lvfs_exist(struct llog_handle *handle)
 680 {
 681         return (handle->lgh_file != NULL);
 682 }
 683
 684 /* This is a callback from the llog_* functions.
 685  * Assumes caller has already pushed us into the kernel context. */
 686 static int llog_lvfs_create(const struct lu_env *env,
 687                             struct llog_handle *handle,
 688                             struct thandle *th)
 689 {
 690         struct llog_ctxt        *ctxt = handle->lgh_ctxt;
 691         struct obd_device       *obd;
 692         struct l_dentry         *dchild = NULL;
 693         struct obdo             *oa = NULL;
 694         int                      rc = 0;
 695         int                      open_flags = O_RDWR | O_CREAT | O_LARGEFILE;
 696
 697         ENTRY;
 698
 699         LASSERT(ctxt);
 700         LASSERT(ctxt->loc_exp);
 701         obd = ctxt->loc_exp->exp_obd;
 702         LASSERT(handle->lgh_file == NULL);
 703
 704         if (handle->lgh_name) {
 705                 handle->lgh_file = llog_filp_open(MOUNT_CONFIGS_DIR,
 706                                                   handle->lgh_name,
 707                                                   open_flags, 0644);
 708                 if (IS_ERR(handle->lgh_file))
 709                         RETURN(PTR_ERR(handle->lgh_file));
 710
 711                 handle->lgh_id.lgl_oseq = FID_SEQ_LLOG;
 712                 handle->lgh_id.lgl_oid =
 713                         handle->lgh_file->f_dentry->d_inode->i_ino;
 714                 handle->lgh_id.lgl_ogen =
 715                         handle->lgh_file->f_dentry->d_inode->i_generation;
 716         } else {
 717                 OBDO_ALLOC(oa);
 718                 if (oa == NULL)
 719                         RETURN(-ENOMEM);
 720
 721                 oa->o_seq = FID_SEQ_LLOG;
 722                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLGROUP;
 723
 724                 rc = obd_create(NULL, ctxt->loc_exp, oa, NULL, NULL);
 725                 if (rc)
 726                         GOTO(out, rc);
 727
 728                 /* FIXME: rationalize the misuse of o_generation in
 729                  *        this API along with mds_obd_{create,destroy}.
 730                  *        Hopefully it is only an internal API issue. */
 731 #define o_generation o_parent_oid
 732                 dchild = obd_lvfs_fid2dentry(ctxt->loc_exp, oa->o_id,
 733                                              oa->o_generation, oa->o_seq);
 734                 if (IS_ERR(dchild))
 735                         GOTO(out, rc = PTR_ERR(dchild));
 736
 737                 handle->lgh_file = l_dentry_open(&obd->obd_lvfs_ctxt, dchild,
 738                                                  open_flags);
 739                 if (IS_ERR(handle->lgh_file))
 740                         GOTO(out, rc = PTR_ERR(handle->lgh_file));
 741
 742                 handle->lgh_id.lgl_oseq = oa->o_seq;
 743                 handle->lgh_id.lgl_oid = oa->o_id;
 744                 handle->lgh_id.lgl_ogen = oa->o_generation;
 745 out:
 746                 OBDO_FREE(oa);
 747         }
 748         RETURN(rc);
 749 }
 750
 751 static int llog_lvfs_close(const struct lu_env *env,
 752                            struct llog_handle *handle)
 753 {
 754         int rc;
 755
 756         ENTRY;
 757
 758         if (handle->lgh_file == NULL)
 759                 RETURN(0);
 760         rc = filp_close(handle->lgh_file, 0);
 761         if (rc)
 762                 CERROR("%s: error closing llog #"LPX64"#"LPX64"#%08x: "
 763                        "rc = %d\n", handle->lgh_ctxt->loc_obd->obd_name,
 764                        handle->lgh_id.lgl_oid, handle->lgh_id.lgl_oseq,
 765                        handle->lgh_id.lgl_ogen, rc);
 766         handle->lgh_file = NULL;
 767         if (handle->lgh_name) {
 768                 OBD_FREE(handle->lgh_name, strlen(handle->lgh_name) + 1);
 769                 handle->lgh_name = NULL;
 770         }
 771         RETURN(rc);
 772 }
 773
 774 static int llog_lvfs_destroy(const struct lu_env *env,
 775                              struct llog_handle *handle)
 776 {
 777         struct dentry *fdentry;
 778         struct obdo *oa;
 779         struct obd_device *obd = handle->lgh_ctxt->loc_exp->exp_obd;
 780         char *dir;
 781         void *th;
 782         struct inode *inode;
 783         int rc, rc1;
 784         ENTRY;
 785
 786         dir = MOUNT_CONFIGS_DIR;
 787
 788         LASSERT(handle->lgh_file);
 789         fdentry = handle->lgh_file->f_dentry;
 790         inode = fdentry->d_parent->d_inode;
 791         if (strcmp(fdentry->d_parent->d_name.name, dir) == 0) {
 792                 struct lvfs_run_ctxt saved;
 793                 struct vfsmount *mnt = mntget(handle->lgh_file->f_vfsmnt);
 794
 795                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 796                 dget(fdentry);
 797                 rc = llog_lvfs_close(env, handle);
 798                 if (rc == 0) {
 799                         mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
 800                         rc = ll_vfs_unlink(inode, fdentry, mnt);
 801                         mutex_unlock(&inode->i_mutex);
 802                 }
 803                 mntput(mnt);
 804
 805                 dput(fdentry);
 806                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 807                 RETURN(rc);
 808         }
 809
 810         OBDO_ALLOC(oa);
 811         if (oa == NULL)
 812                 RETURN(-ENOMEM);
 813
 814         oa->o_id = handle->lgh_id.lgl_oid;
 815         oa->o_seq = handle->lgh_id.lgl_oseq;
 816         oa->o_generation = handle->lgh_id.lgl_ogen;
 817 #undef o_generation
 818         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP | OBD_MD_FLGENER;
 819
 820         rc = llog_lvfs_close(env, handle);
 821         if (rc)
 822                 GOTO(out, rc);
 823
 824         th = fsfilt_start_log(obd, inode, FSFILT_OP_UNLINK, NULL, 1);
 825         if (IS_ERR(th)) {
 826                 CERROR("fsfilt_start failed: %ld\n", PTR_ERR(th));
 827                 GOTO(out, rc = PTR_ERR(th));
 828         }
 829
 830         rc = obd_destroy(NULL, handle->lgh_ctxt->loc_exp, oa,
 831                          NULL, NULL, NULL, NULL);
 832
 833         rc1 = fsfilt_commit(obd, inode, th, 0);
 834         if (rc == 0 && rc1 != 0)
 835                 rc = rc1;
 836  out:
 837         OBDO_FREE(oa);
 838         RETURN(rc);
 839 }
 840
 841 /* reads the catalog list */
 842 int llog_get_cat_list(struct obd_device *disk_obd,
 843                       char *name, int idx, int count, struct llog_catid *idarray)
 844 {
 845         struct lvfs_run_ctxt saved;
 846         struct l_file *file;
 847         int rc, rc1 = 0;
 848         int size = sizeof(*idarray) * count;
 849         loff_t off = idx *  sizeof(*idarray);
 850         ENTRY;
 851
 852         if (!count)
 853                 RETURN(0);
 854
 855         push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 856         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 857         if (!file || IS_ERR(file)) {
 858                 rc = PTR_ERR(file);
 859                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 860                        name, rc);
 861                 GOTO(out, rc);
 862         }
 863
 864         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 865                 CERROR("%s is not a regular file!: mode = %o\n", name,
 866                        file->f_dentry->d_inode->i_mode);
 867                 GOTO(out, rc = -ENOENT);
 868         }
 869
 870         CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
 871                (int)i_size_read(file->f_dentry->d_inode), size);
 872
 873         /* read for new ost index or for empty file */
 874         memset(idarray, 0, size);
 875         if (i_size_read(file->f_dentry->d_inode) < off)
 876                 GOTO(out, rc = 0);
 877
 878         rc = fsfilt_read_record(disk_obd, file, idarray, size, &off);
 879         if (rc) {
 880                 CERROR("OBD filter: error reading %s: rc %d\n", name, rc);
 881                 GOTO(out, rc);
 882         }
 883
 884         EXIT;
 885  out:
 886         pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 887         if (file && !IS_ERR(file))
 888                 rc1 = filp_close(file, 0);
 889         if (rc == 0)
 890                 rc = rc1;
 891         return rc;
 892 }
 893 EXPORT_SYMBOL(llog_get_cat_list);
 894
 895 /* writes the cat list */
 896 int llog_put_cat_list(struct obd_device *disk_obd,
 897                       char *name, int idx, int count, struct llog_catid *idarray)
 898 {
 899         struct lvfs_run_ctxt saved;
 900         struct l_file *file;
 901         int rc, rc1 = 0;
 902         int size = sizeof(*idarray) * count;
 903         loff_t off = idx * sizeof(*idarray);
 904
 905         if (!count)
 906                 GOTO(out1, rc = 0);
 907
 908         push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 909         file = filp_open(name, O_RDWR | O_CREAT | O_LARGEFILE, 0700);
 910         if (!file || IS_ERR(file)) {
 911                 rc = PTR_ERR(file);
 912                 CERROR("OBD filter: cannot open/create %s: rc = %d\n",
 913                        name, rc);
 914                 GOTO(out, rc);
 915         }
 916
 917         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
 918                 CERROR("%s is not a regular file!: mode = %o\n", name,
 919                        file->f_dentry->d_inode->i_mode);
 920                 GOTO(out, rc = -ENOENT);
 921         }
 922
 923         rc = fsfilt_write_record(disk_obd, file, idarray, size, &off, 1);
 924         if (rc) {
 925                 CDEBUG(D_INODE,"OBD filter: error writeing %s: rc %d\n",
 926                        name, rc);
 927                 GOTO(out, rc);
 928         }
 929
 930 out:
 931         pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
 932         if (file && !IS_ERR(file))
 933                 rc1 = filp_close(file, 0);
 934
 935         if (rc == 0)
 936                 rc = rc1;
 937 out1:
 938         RETURN(rc);
 939 }
 940 EXPORT_SYMBOL(llog_put_cat_list);
 941
 942 static int llog_lvfs_declare_create(const struct lu_env *env,
 943                                     struct llog_handle *res,
 944                                     struct thandle *th)
 945 {
 946         return 0;
 947 }
 948
 949 static int llog_lvfs_declare_write_rec(const struct lu_env *env,
 950                                        struct llog_handle *loghandle,
 951                                        struct llog_rec_hdr *rec,
 952                                        int idx, struct thandle *th)
 953 {
 954         return 0;
 955 }
 956
 957 struct llog_operations llog_lvfs_ops = {
 958         .lop_write_rec          = llog_lvfs_write_rec,
 959         .lop_next_block         = llog_lvfs_next_block,
 960         .lop_prev_block         = llog_lvfs_prev_block,
 961         .lop_read_header        = llog_lvfs_read_header,
 962         .lop_create             = llog_lvfs_create,
 963         .lop_destroy            = llog_lvfs_destroy,
 964         .lop_close              = llog_lvfs_close,
 965         .lop_open               = llog_lvfs_open,
 966         .lop_exist              = llog_lvfs_exist,
 967         .lop_declare_create     = llog_lvfs_declare_create,
 968         .lop_declare_write_rec  = llog_lvfs_declare_write_rec,
 969 };
 970 EXPORT_SYMBOL(llog_lvfs_ops);
 971 #else /* !__KERNEL__ */
 972 int llog_get_cat_list(struct obd_device *disk_obd,
 973                       char *name, int idx, int count,
 974                       struct llog_catid *idarray)
 975 {
 976         LBUG();
 977         return 0;
 978 }
 979
 980 int llog_put_cat_list(struct obd_device *disk_obd,
 981                       char *name, int idx, int count,
 982                       struct llog_catid *idarray)
 983 {
 984         LBUG();
 985         return 0;
 986 }
 987
 988 struct llog_operations llog_lvfs_ops = {};
 989 #endif