lustre/obdclass/llog_osd.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) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, Intel Corporation.
  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_osd.c - low level llog routines on top of OSD API
  37  *
  38  * Author: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
  39  * Author: Mikhail Pershin <mike.pershin@intel.com>
  40  */
  41
  42 #define DEBUG_SUBSYSTEM S_LOG
  43
  44 #include <obd.h>
  45 #include <obd_class.h>
  46 #include <lustre_fid.h>
  47 #include <dt_object.h>
  48
  49 #include "llog_internal.h"
  50 #include "local_storage.h"
  51
  52 /*
  53  * - multi-chunks or big-declaration approach
  54  * - use unique sequence instead of llog sb tracking unique ids
  55  * - re-use existing environment
  56  * - named llog support (can be used for testing only at the present)
  57  * - llog_origin_connect() work with OSD API
  58  */
  59
  60 static int llog_osd_declare_new_object(const struct lu_env *env,
  61                                        struct local_oid_storage *los,
  62                                        struct dt_object *o,
  63                                        struct thandle *th)
  64 {
  65         struct llog_thread_info *lgi = llog_info(env);
  66
  67         lgi->lgi_attr.la_valid = LA_MODE;
  68         lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
  69         lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
  70
  71         return local_object_declare_create(env, los, o, &lgi->lgi_attr,
  72                                            &lgi->lgi_dof, th);
  73 }
  74
  75 static int llog_osd_create_new_object(const struct lu_env *env,
  76                                       struct local_oid_storage *los,
  77                                       struct dt_object *o,
  78                                       struct thandle *th)
  79 {
  80         struct llog_thread_info *lgi = llog_info(env);
  81
  82         lgi->lgi_attr.la_valid = LA_MODE;
  83         lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
  84         lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
  85
  86         return local_object_create(env, los, o, &lgi->lgi_attr,
  87                                    &lgi->lgi_dof, th);
  88 }
  89
  90 static int llog_osd_pad(const struct lu_env *env, struct dt_object *o,
  91                         loff_t *off, int len, int index, struct thandle *th)
  92 {
  93         struct llog_thread_info *lgi = llog_info(env);
  94         int                      rc;
  95
  96         ENTRY;
  97
  98         LASSERT(th);
  99         LASSERT(off);
 100         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
 101
 102         lgi->lgi_tail.lrt_len = lgi->lgi_lrh.lrh_len = len;
 103         lgi->lgi_tail.lrt_index = lgi->lgi_lrh.lrh_index = index;
 104         lgi->lgi_lrh.lrh_type = LLOG_PAD_MAGIC;
 105
 106         lgi->lgi_buf.lb_buf = &lgi->lgi_lrh;
 107         lgi->lgi_buf.lb_len = sizeof(lgi->lgi_lrh);
 108         dt_write_lock(env, o, 0);
 109         rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 110         if (rc) {
 111                 CERROR("%s: error writing padding record: rc = %d\n",
 112                        o->do_lu.lo_dev->ld_obd->obd_name, rc);
 113                 GOTO(out, rc);
 114         }
 115
 116         lgi->lgi_buf.lb_buf = &lgi->lgi_tail;
 117         lgi->lgi_buf.lb_len = sizeof(lgi->lgi_tail);
 118         *off += len - sizeof(lgi->lgi_lrh) - sizeof(lgi->lgi_tail);
 119         rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 120         if (rc)
 121                 CERROR("%s: error writing padding record: rc = %d\n",
 122                        o->do_lu.lo_dev->ld_obd->obd_name, rc);
 123 out:
 124         dt_write_unlock(env, o);
 125         RETURN(rc);
 126 }
 127
 128 static int llog_osd_write_blob(const struct lu_env *env, struct dt_object *o,
 129                                struct llog_rec_hdr *rec, void *buf,
 130                                loff_t *off, struct thandle *th)
 131 {
 132         struct llog_thread_info *lgi = llog_info(env);
 133         int                      buflen = rec->lrh_len;
 134         int                      rc;
 135
 136         ENTRY;
 137
 138         LASSERT(env);
 139         LASSERT(o);
 140
 141         if (buflen == 0)
 142                 CWARN("0-length record\n");
 143
 144         CDEBUG(D_OTHER, "write blob with type %x, buf %p/%u at off %llu\n",
 145                rec->lrh_type, buf, buflen, *off);
 146
 147         lgi->lgi_attr.la_valid = LA_SIZE;
 148         lgi->lgi_attr.la_size = *off;
 149
 150         if (!buf) {
 151                 lgi->lgi_buf.lb_len = buflen;
 152                 lgi->lgi_buf.lb_buf = rec;
 153                 rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 154                 if (rc)
 155                         CERROR("%s: error writing log record: rc = %d\n",
 156                                o->do_lu.lo_dev->ld_obd->obd_name, rc);
 157                 GOTO(out, rc);
 158         }
 159
 160         /* the buf case */
 161         /* protect the following 3 writes from concurrent read */
 162         dt_write_lock(env, o, 0);
 163         rec->lrh_len = sizeof(*rec) + buflen + sizeof(lgi->lgi_tail);
 164         lgi->lgi_buf.lb_len = sizeof(*rec);
 165         lgi->lgi_buf.lb_buf = rec;
 166         rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 167         if (rc) {
 168                 CERROR("%s: error writing log hdr: rc = %d\n",
 169                        o->do_lu.lo_dev->ld_obd->obd_name, rc);
 170                 GOTO(out_unlock, rc);
 171         }
 172
 173         lgi->lgi_buf.lb_len = buflen;
 174         lgi->lgi_buf.lb_buf = buf;
 175         rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 176         if (rc) {
 177                 CERROR("%s: error writing log buffer: rc = %d\n",
 178                        o->do_lu.lo_dev->ld_obd->obd_name,  rc);
 179                 GOTO(out_unlock, rc);
 180         }
 181
 182         lgi->lgi_tail.lrt_len = rec->lrh_len;
 183         lgi->lgi_tail.lrt_index = rec->lrh_index;
 184         lgi->lgi_buf.lb_len = sizeof(lgi->lgi_tail);
 185         lgi->lgi_buf.lb_buf = &lgi->lgi_tail;
 186         rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 187         if (rc)
 188                 CERROR("%s: error writing log tail: rc = %d\n",
 189                        o->do_lu.lo_dev->ld_obd->obd_name, rc);
 190
 191 out_unlock:
 192         dt_write_unlock(env, o);
 193
 194 out:
 195         /* cleanup the content written above */
 196         if (rc) {
 197                 dt_punch(env, o, lgi->lgi_attr.la_size, OBD_OBJECT_EOF, th,
 198                          BYPASS_CAPA);
 199                 dt_attr_set(env, o, &lgi->lgi_attr, th, BYPASS_CAPA);
 200         }
 201
 202         RETURN(rc);
 203 }
 204
 205 static int llog_osd_read_header(const struct lu_env *env,
 206                                 struct llog_handle *handle)
 207 {
 208         struct llog_rec_hdr     *llh_hdr;
 209         struct dt_object        *o;
 210         struct llog_thread_info *lgi;
 211         int                      rc;
 212
 213         ENTRY;
 214
 215         LASSERT(sizeof(*handle->lgh_hdr) == LLOG_CHUNK_SIZE);
 216
 217         o = handle->lgh_obj;
 218         LASSERT(o);
 219
 220         lgi = llog_info(env);
 221
 222         rc = dt_attr_get(env, o, &lgi->lgi_attr, NULL);
 223         if (rc)
 224                 RETURN(rc);
 225
 226         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 227
 228         if (lgi->lgi_attr.la_size == 0) {
 229                 CDEBUG(D_HA, "not reading header from 0-byte log\n");
 230                 RETURN(LLOG_EEMPTY);
 231         }
 232
 233         lgi->lgi_off = 0;
 234         lgi->lgi_buf.lb_buf = handle->lgh_hdr;
 235         lgi->lgi_buf.lb_len = LLOG_CHUNK_SIZE;
 236
 237         rc = dt_record_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
 238         if (rc) {
 239                 CERROR("%s: error reading log header from "DFID": rc = %d\n",
 240                        o->do_lu.lo_dev->ld_obd->obd_name,
 241                        PFID(lu_object_fid(&o->do_lu)), rc);
 242                 RETURN(rc);
 243         }
 244
 245         llh_hdr = &handle->lgh_hdr->llh_hdr;
 246         if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
 247                 lustre_swab_llog_hdr(handle->lgh_hdr);
 248
 249         if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 250                 CERROR("%s: bad log %s "DFID" header magic: %#x "
 251                        "(expected %#x)\n", o->do_lu.lo_dev->ld_obd->obd_name,
 252                        handle->lgh_name ? handle->lgh_name : "",
 253                        PFID(lu_object_fid(&o->do_lu)),
 254                        llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 255                 RETURN(-EIO);
 256         } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 257                 CERROR("%s: incorrectly sized log %s "DFID" header: "
 258                        "%#x (expected %#x)\n"
 259                        "you may need to re-run lconf --write_conf.\n",
 260                        o->do_lu.lo_dev->ld_obd->obd_name,
 261                        handle->lgh_name ? handle->lgh_name : "",
 262                        PFID(lu_object_fid(&o->do_lu)),
 263                        llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 264                 RETURN(-EIO);
 265         }
 266
 267         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 268
 269         RETURN(0);
 270 }
 271
 272 static int llog_osd_declare_write_rec(const struct lu_env *env,
 273                                       struct llog_handle *loghandle,
 274                                       struct llog_rec_hdr *rec,
 275                                       int idx, struct thandle *th)
 276 {
 277         struct llog_thread_info *lgi = llog_info(env);
 278         struct dt_object        *o;
 279         int                      rc;
 280
 281         ENTRY;
 282
 283         LASSERT(env);
 284         LASSERT(th);
 285         LASSERT(loghandle);
 286         LASSERT(rec);
 287         LASSERT(rec->lrh_len <= LLOG_CHUNK_SIZE);
 288
 289         o = loghandle->lgh_obj;
 290         LASSERT(o);
 291
 292         lgi->lgi_buf.lb_len = sizeof(struct llog_log_hdr);
 293         lgi->lgi_buf.lb_buf = NULL;
 294         /* each time we update header */
 295         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, 0,
 296                                      th);
 297         if (rc || idx == 0) /* if error or just header */
 298                 RETURN(rc);
 299
 300         if (dt_object_exists(o)) {
 301                 rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
 302                 lgi->lgi_off = lgi->lgi_attr.la_size;
 303                 LASSERT(ergo(rc == 0, lgi->lgi_attr.la_valid & LA_SIZE));
 304                 if (rc)
 305                         RETURN(rc);
 306
 307                 rc = dt_declare_punch(env, o, lgi->lgi_off, OBD_OBJECT_EOF, th);
 308                 if (rc)
 309                         RETURN(rc);
 310         } else {
 311                 lgi->lgi_off = 0;
 312         }
 313
 314         lgi->lgi_buf.lb_len = rec->lrh_len;
 315         lgi->lgi_buf.lb_buf = NULL;
 316         /* XXX: implement declared window or multi-chunks approach */
 317         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, -1, th);
 318
 319         RETURN(rc);
 320 }
 321
 322 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 323 /* appends if idx == -1, otherwise overwrites record idx. */
 324 static int llog_osd_write_rec(const struct lu_env *env,
 325                               struct llog_handle *loghandle,
 326                               struct llog_rec_hdr *rec,
 327                               struct llog_cookie *reccookie, int cookiecount,
 328                               void *buf, int idx, struct thandle *th)
 329 {
 330         struct llog_thread_info *lgi = llog_info(env);
 331         struct llog_log_hdr     *llh;
 332         int                      reclen = rec->lrh_len;
 333         int                      index, rc, old_tail_idx;
 334         struct llog_rec_tail    *lrt;
 335         struct dt_object        *o;
 336         size_t                   left;
 337
 338         ENTRY;
 339
 340         LASSERT(env);
 341         llh = loghandle->lgh_hdr;
 342         LASSERT(llh);
 343         o = loghandle->lgh_obj;
 344         LASSERT(o);
 345         LASSERT(th);
 346
 347         CDEBUG(D_OTHER, "new record %x to "DFID"\n",
 348                rec->lrh_type, PFID(lu_object_fid(&o->do_lu)));
 349
 350         /* record length should not bigger than LLOG_CHUNK_SIZE */
 351         if (buf)
 352                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
 353                       sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 354         else
 355                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 356         if (rc)
 357                 RETURN(rc);
 358
 359         rc = dt_attr_get(env, o, &lgi->lgi_attr, NULL);
 360         if (rc)
 361                 RETURN(rc);
 362
 363         if (buf)
 364                 /* write_blob adds header and tail to lrh_len. */
 365                 reclen = sizeof(*rec) + rec->lrh_len +
 366                          sizeof(struct llog_rec_tail);
 367
 368         if (idx != -1) {
 369                 /* no header: only allowed to insert record 1 */
 370                 if (idx != 1 && lgi->lgi_attr.la_size == 0)
 371                         LBUG();
 372
 373                 if (idx && llh->llh_size && llh->llh_size != rec->lrh_len)
 374                         RETURN(-EINVAL);
 375
 376                 if (!ext2_test_bit(idx, llh->llh_bitmap))
 377                         CERROR("%s: modify unset record %u\n",
 378                                o->do_lu.lo_dev->ld_obd->obd_name, idx);
 379                 if (idx != rec->lrh_index)
 380                         CERROR("%s: index mismatch %d %u\n",
 381                                o->do_lu.lo_dev->ld_obd->obd_name, idx,
 382                                rec->lrh_index);
 383
 384                 lgi->lgi_off = 0;
 385                 rc = llog_osd_write_blob(env, o, &llh->llh_hdr, NULL,
 386                                          &lgi->lgi_off, th);
 387                 /* we are done if we only write the header or on error */
 388                 if (rc || idx == 0)
 389                         RETURN(rc);
 390
 391                 if (buf) {
 392                         /* We assume that caller has set lgh_cur_* */
 393                         lgi->lgi_off = loghandle->lgh_cur_offset;
 394                         CDEBUG(D_OTHER,
 395                                "modify record "DOSTID": idx:%d/%u/%d, len:%u "
 396                                "offset %llu\n",
 397                                POSTID(&loghandle->lgh_id.lgl_oi), idx,
 398                                rec->lrh_index,
 399                                loghandle->lgh_cur_idx, rec->lrh_len,
 400                                (long long)(lgi->lgi_off - sizeof(*llh)));
 401                         if (rec->lrh_index != loghandle->lgh_cur_idx) {
 402                                 CERROR("%s: modify idx mismatch %u/%d\n",
 403                                        o->do_lu.lo_dev->ld_obd->obd_name, idx,
 404                                        loghandle->lgh_cur_idx);
 405                                 RETURN(-EFAULT);
 406                         }
 407                 } else {
 408                         /* Assumes constant lrh_len */
 409                         lgi->lgi_off = sizeof(*llh) + (idx - 1) * reclen;
 410                 }
 411
 412                 rc = llog_osd_write_blob(env, o, rec, buf, &lgi->lgi_off, th);
 413                 if (rc == 0 && reccookie) {
 414                         reccookie->lgc_lgl = loghandle->lgh_id;
 415                         reccookie->lgc_index = idx;
 416                         rc = 1;
 417                 }
 418                 RETURN(rc);
 419         }
 420
 421         /* Make sure that records don't cross a chunk boundary, so we can
 422          * process them page-at-a-time if needed.  If it will cross a chunk
 423          * boundary, write in a fake (but referenced) entry to pad the chunk.
 424          *
 425          * We know that llog_current_log() will return a loghandle that is
 426          * big enough to hold reclen, so all we care about is padding here.
 427          */
 428         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 429         lgi->lgi_off = lgi->lgi_attr.la_size;
 430         left = LLOG_CHUNK_SIZE - (lgi->lgi_off & (LLOG_CHUNK_SIZE - 1));
 431         /* NOTE: padding is a record, but no bit is set */
 432         if (left != 0 && left != reclen &&
 433             left < (reclen + LLOG_MIN_REC_SIZE)) {
 434                 index = loghandle->lgh_last_idx + 1;
 435                 rc = llog_osd_pad(env, o, &lgi->lgi_off, left, index, th);
 436                 if (rc)
 437                         RETURN(rc);
 438                 loghandle->lgh_last_idx++; /*for pad rec*/
 439         }
 440         /* if it's the last idx in log file, then return -ENOSPC */
 441         if (loghandle->lgh_last_idx >= LLOG_BITMAP_SIZE(llh) - 1)
 442                 RETURN(-ENOSPC);
 443
 444         loghandle->lgh_last_idx++;
 445         index = loghandle->lgh_last_idx;
 446         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 447         rec->lrh_index = index;
 448         if (buf == NULL) {
 449                 lrt = (struct llog_rec_tail *)((char *)rec + rec->lrh_len -
 450                                                sizeof(*lrt));
 451                 lrt->lrt_len = rec->lrh_len;
 452                 lrt->lrt_index = rec->lrh_index;
 453         }
 454         /* The caller should make sure only 1 process access the lgh_last_idx,
 455          * Otherwise it might hit the assert.*/
 456         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 457         spin_lock(&loghandle->lgh_hdr_lock);
 458         if (ext2_set_bit(index, llh->llh_bitmap)) {
 459                 CERROR("%s: index %u already set in log bitmap\n",
 460                        o->do_lu.lo_dev->ld_obd->obd_name, index);
 461                 spin_unlock(&loghandle->lgh_hdr_lock);
 462                 LBUG(); /* should never happen */
 463         }
 464         llh->llh_count++;
 465         spin_unlock(&loghandle->lgh_hdr_lock);
 466         old_tail_idx = llh->llh_tail.lrt_index;
 467         llh->llh_tail.lrt_index = index;
 468
 469         lgi->lgi_off = 0;
 470         rc = llog_osd_write_blob(env, o, &llh->llh_hdr, NULL, &lgi->lgi_off,
 471                                  th);
 472         if (rc)
 473                 GOTO(out, rc);
 474
 475         rc = dt_attr_get(env, o, &lgi->lgi_attr, NULL);
 476         if (rc)
 477                 GOTO(out, rc);
 478
 479         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 480         lgi->lgi_off = lgi->lgi_attr.la_size;
 481
 482         rc = llog_osd_write_blob(env, o, rec, buf, &lgi->lgi_off, th);
 483
 484 out:
 485         /* cleanup llog for error case */
 486         if (rc) {
 487                 spin_lock(&loghandle->lgh_hdr_lock);
 488                 ext2_clear_bit(index, llh->llh_bitmap);
 489                 llh->llh_count--;
 490                 spin_unlock(&loghandle->lgh_hdr_lock);
 491
 492                 /* restore the header */
 493                 loghandle->lgh_last_idx--;
 494                 llh->llh_tail.lrt_index = old_tail_idx;
 495                 lgi->lgi_off = 0;
 496                 llog_osd_write_blob(env, o, &llh->llh_hdr, NULL,
 497                                     &lgi->lgi_off, th);
 498         }
 499
 500         CDEBUG(D_RPCTRACE, "added record "DOSTID": idx: %u, %u\n",
 501                POSTID(&loghandle->lgh_id.lgl_oi), index, rec->lrh_len);
 502         if (rc == 0 && reccookie) {
 503                 reccookie->lgc_lgl = loghandle->lgh_id;
 504                 reccookie->lgc_index = index;
 505                 if ((rec->lrh_type == MDS_UNLINK_REC) ||
 506                     (rec->lrh_type == MDS_SETATTR64_REC))
 507                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 508                 else if (rec->lrh_type == OST_SZ_REC)
 509                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 510                 else
 511                         reccookie->lgc_subsys = -1;
 512                 rc = 1;
 513         }
 514         RETURN(rc);
 515 }
 516
 517 /* We can skip reading at least as many log blocks as the number of
 518  * minimum sized log records we are skipping.  If it turns out
 519  * that we are not far enough along the log (because the
 520  * actual records are larger than minimum size) we just skip
 521  * some more records.
 522  */
 523 static void llog_skip_over(__u64 *off, int curr, int goal)
 524 {
 525         if (goal <= curr)
 526                 return;
 527         *off = (*off + (goal - curr - 1) * LLOG_MIN_REC_SIZE) &
 528                 ~(LLOG_CHUNK_SIZE - 1);
 529 }
 530
 531 /* sets:
 532  *  - cur_offset to the furthest point read in the log file
 533  *  - cur_idx to the log index preceeding cur_offset
 534  * returns -EIO/-EINVAL on error
 535  */
 536 static int llog_osd_next_block(const struct lu_env *env,
 537                                struct llog_handle *loghandle, int *cur_idx,
 538                                int next_idx, __u64 *cur_offset, void *buf,
 539                                int len)
 540 {
 541         struct llog_thread_info *lgi = llog_info(env);
 542         struct dt_object        *o;
 543         struct dt_device        *dt;
 544         int                      rc;
 545
 546         ENTRY;
 547
 548         LASSERT(env);
 549         LASSERT(lgi);
 550
 551         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 552                 RETURN(-EINVAL);
 553
 554         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 555                next_idx, *cur_idx, *cur_offset);
 556
 557         LASSERT(loghandle);
 558         LASSERT(loghandle->lgh_ctxt);
 559
 560         o = loghandle->lgh_obj;
 561         LASSERT(o);
 562         LASSERT(dt_object_exists(o));
 563         dt = lu2dt_dev(o->do_lu.lo_dev);
 564         LASSERT(dt);
 565
 566         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
 567         if (rc)
 568                 GOTO(out, rc);
 569
 570         while (*cur_offset < lgi->lgi_attr.la_size) {
 571                 struct llog_rec_hdr     *rec, *last_rec;
 572                 struct llog_rec_tail    *tail;
 573
 574                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 575
 576                 /* read up to next LLOG_CHUNK_SIZE block */
 577                 lgi->lgi_buf.lb_len = LLOG_CHUNK_SIZE -
 578                                       (*cur_offset & (LLOG_CHUNK_SIZE - 1));
 579                 lgi->lgi_buf.lb_buf = buf;
 580
 581                 /* Note: read lock is not needed around la_size get above at
 582                  * the time of dt_attr_get(). There are only two cases that
 583                  * matter. Either la_size == cur_offset, in which case the
 584                  * entire read is skipped, or la_size > cur_offset and the loop
 585                  * is entered and this thread is blocked at dt_read_lock()
 586                  * until the write is completed. When the write completes, then
 587                  * the dt_read() will be done with the full length, and will
 588                  * get the full data.
 589                  */
 590                 dt_read_lock(env, o, 0);
 591                 rc = dt_read(env, o, &lgi->lgi_buf, cur_offset);
 592                 dt_read_unlock(env, o);
 593                 if (rc < 0) {
 594                         CERROR("%s: can't read llog block from log "DFID
 595                                " offset "LPU64": rc = %d\n",
 596                                o->do_lu.lo_dev->ld_obd->obd_name,
 597                                PFID(lu_object_fid(&o->do_lu)), *cur_offset,
 598                                rc);
 599                         GOTO(out, rc);
 600                 }
 601
 602                 if (rc < len) {
 603                         /* signal the end of the valid buffer to
 604                          * llog_process */
 605                         memset(buf + rc, 0, len - rc);
 606                 }
 607
 608                 if (rc == 0) /* end of file, nothing to do */
 609                         GOTO(out, rc);
 610
 611                 if (rc < sizeof(*tail)) {
 612                         CERROR("%s: invalid llog block at log id "DOSTID"/%u "
 613                                "offset "LPU64"\n",
 614                                o->do_lu.lo_dev->ld_obd->obd_name,
 615                                POSTID(&loghandle->lgh_id.lgl_oi),
 616                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 617                         GOTO(out, rc = -EINVAL);
 618                 }
 619
 620                 rec = buf;
 621                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 622                         lustre_swab_llog_rec(rec);
 623
 624                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 625                                                 sizeof(struct llog_rec_tail));
 626                 /* get the last record in block */
 627                 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
 628                                                    le32_to_cpu(tail->lrt_len));
 629
 630                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 631                         lustre_swab_llog_rec(last_rec);
 632                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 633
 634                 *cur_idx = tail->lrt_index;
 635
 636                 /* this shouldn't happen */
 637                 if (tail->lrt_index == 0) {
 638                         CERROR("%s: invalid llog tail at log id "DOSTID"/%u "
 639                                "offset "LPU64"\n",
 640                                o->do_lu.lo_dev->ld_obd->obd_name,
 641                                POSTID(&loghandle->lgh_id.lgl_oi),
 642                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 643                         GOTO(out, rc = -EINVAL);
 644                 }
 645                 if (tail->lrt_index < next_idx)
 646                         continue;
 647
 648                 /* sanity check that the start of the new buffer is no farther
 649                  * than the record that we wanted.  This shouldn't happen. */
 650                 if (rec->lrh_index > next_idx) {
 651                         CERROR("%s: missed desired record? %u > %u\n",
 652                                o->do_lu.lo_dev->ld_obd->obd_name,
 653                                rec->lrh_index, next_idx);
 654                         GOTO(out, rc = -ENOENT);
 655                 }
 656                 GOTO(out, rc = 0);
 657         }
 658         GOTO(out, rc = -EIO);
 659 out:
 660         return rc;
 661 }
 662
 663 static int llog_osd_prev_block(const struct lu_env *env,
 664                                struct llog_handle *loghandle,
 665                                int prev_idx, void *buf, int len)
 666 {
 667         struct llog_thread_info *lgi = llog_info(env);
 668         struct dt_object        *o;
 669         struct dt_device        *dt;
 670         loff_t                   cur_offset;
 671         int                      rc;
 672
 673         ENTRY;
 674
 675         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 676                 RETURN(-EINVAL);
 677
 678         CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
 679
 680         LASSERT(loghandle);
 681         LASSERT(loghandle->lgh_ctxt);
 682
 683         o = loghandle->lgh_obj;
 684         LASSERT(o);
 685         LASSERT(dt_object_exists(o));
 686         dt = lu2dt_dev(o->do_lu.lo_dev);
 687         LASSERT(dt);
 688
 689         cur_offset = LLOG_CHUNK_SIZE;
 690         llog_skip_over(&cur_offset, 0, prev_idx);
 691
 692         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
 693         if (rc)
 694                 GOTO(out, rc);
 695
 696         while (cur_offset < lgi->lgi_attr.la_size) {
 697                 struct llog_rec_hdr     *rec, *last_rec;
 698                 struct llog_rec_tail    *tail;
 699
 700                 lgi->lgi_buf.lb_len = len;
 701                 lgi->lgi_buf.lb_buf = buf;
 702                 /* It is OK to have locking around dt_read() only, see
 703                  * comment in llog_osd_next_block for details
 704                  */
 705                 dt_read_lock(env, o, 0);
 706                 rc = dt_read(env, o, &lgi->lgi_buf, &cur_offset);
 707                 dt_read_unlock(env, o);
 708                 if (rc < 0) {
 709                         CERROR("%s: can't read llog block from log "DFID
 710                                " offset "LPU64": rc = %d\n",
 711                                o->do_lu.lo_dev->ld_obd->obd_name,
 712                                PFID(lu_object_fid(&o->do_lu)), cur_offset, rc);
 713                         GOTO(out, rc);
 714                 }
 715
 716                 if (rc == 0) /* end of file, nothing to do */
 717                         GOTO(out, rc);
 718
 719                 if (rc < sizeof(*tail)) {
 720                         CERROR("%s: invalid llog block at log id "DOSTID"/%u "
 721                                "offset "LPU64"\n",
 722                                o->do_lu.lo_dev->ld_obd->obd_name,
 723                                POSTID(&loghandle->lgh_id.lgl_oi),
 724                                loghandle->lgh_id.lgl_ogen, cur_offset);
 725                         GOTO(out, rc = -EINVAL);
 726                 }
 727
 728                 rec = buf;
 729                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 730                         lustre_swab_llog_rec(rec);
 731
 732                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 733                                                 sizeof(struct llog_rec_tail));
 734                 /* get the last record in block */
 735                 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
 736                                                    le32_to_cpu(tail->lrt_len));
 737
 738                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 739                         lustre_swab_llog_rec(last_rec);
 740                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 741
 742                 /* this shouldn't happen */
 743                 if (tail->lrt_index == 0) {
 744                         CERROR("%s: invalid llog tail at log id "DOSTID"/%u "
 745                                "offset "LPU64"\n",
 746                                o->do_lu.lo_dev->ld_obd->obd_name,
 747                                POSTID(&loghandle->lgh_id.lgl_oi),
 748                                loghandle->lgh_id.lgl_ogen, cur_offset);
 749                         GOTO(out, rc = -EINVAL);
 750                 }
 751                 if (tail->lrt_index < prev_idx)
 752                         continue;
 753
 754                 /* sanity check that the start of the new buffer is no farther
 755                  * than the record that we wanted.  This shouldn't happen. */
 756                 if (rec->lrh_index > prev_idx) {
 757                         CERROR("%s: missed desired record? %u > %u\n",
 758                                o->do_lu.lo_dev->ld_obd->obd_name,
 759                                rec->lrh_index, prev_idx);
 760                         GOTO(out, rc = -ENOENT);
 761                 }
 762                 GOTO(out, rc = 0);
 763         }
 764         GOTO(out, rc = -EIO);
 765 out:
 766         return rc;
 767 }
 768
 769 struct dt_object *llog_osd_dir_get(const struct lu_env *env,
 770                                    struct llog_ctxt *ctxt)
 771 {
 772         struct dt_device        *dt;
 773         struct dt_thread_info   *dti = dt_info(env);
 774         struct dt_object        *dir;
 775         int                      rc;
 776
 777         dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
 778         if (ctxt->loc_dir == NULL) {
 779                 rc = dt_root_get(env, dt, &dti->dti_fid);
 780                 if (rc)
 781                         return ERR_PTR(rc);
 782                 dir = dt_locate(env, dt, &dti->dti_fid);
 783
 784                 if (!IS_ERR(dir) && !dt_try_as_dir(env, dir)) {
 785                         lu_object_put(env, &dir->do_lu);
 786                         return ERR_PTR(-ENOTDIR);
 787                 }
 788         } else {
 789                 lu_object_get(&ctxt->loc_dir->do_lu);
 790                 dir = ctxt->loc_dir;
 791         }
 792
 793         return dir;
 794 }
 795
 796 static int llog_osd_open(const struct lu_env *env, struct llog_handle *handle,
 797                          struct llog_logid *logid, char *name,
 798                          enum llog_open_param open_param)
 799 {
 800         struct llog_thread_info         *lgi = llog_info(env);
 801         struct llog_ctxt                *ctxt = handle->lgh_ctxt;
 802         struct dt_object                *o;
 803         struct dt_device                *dt;
 804         struct ls_device                *ls;
 805         struct local_oid_storage        *los;
 806         int                              rc = 0;
 807
 808         ENTRY;
 809
 810         LASSERT(env);
 811         LASSERT(ctxt);
 812         LASSERT(ctxt->loc_exp);
 813         LASSERT(ctxt->loc_exp->exp_obd);
 814         dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
 815         LASSERT(dt);
 816
 817         ls = ls_device_get(dt);
 818         if (IS_ERR(ls))
 819                 RETURN(PTR_ERR(ls));
 820
 821         mutex_lock(&ls->ls_los_mutex);
 822         los = dt_los_find(ls, name != NULL ? FID_SEQ_LLOG_NAME : FID_SEQ_LLOG);
 823         mutex_unlock(&ls->ls_los_mutex);
 824         LASSERT(los);
 825         ls_device_put(env, ls);
 826
 827         LASSERT(handle);
 828
 829         if (logid != NULL) {
 830                 logid_to_fid(logid, &lgi->lgi_fid);
 831         } else if (name) {
 832                 struct dt_object *llog_dir;
 833
 834                 llog_dir = llog_osd_dir_get(env, ctxt);
 835                 if (IS_ERR(llog_dir))
 836                         GOTO(out, rc = PTR_ERR(llog_dir));
 837                 dt_read_lock(env, llog_dir, 0);
 838                 rc = dt_lookup_dir(env, llog_dir, name, &lgi->lgi_fid);
 839                 dt_read_unlock(env, llog_dir);
 840                 lu_object_put(env, &llog_dir->do_lu);
 841                 if (rc == -ENOENT && open_param == LLOG_OPEN_NEW) {
 842                         /* generate fid for new llog */
 843                         rc = local_object_fid_generate(env, los,
 844                                                        &lgi->lgi_fid);
 845                 }
 846                 if (rc < 0)
 847                         GOTO(out, rc);
 848                 OBD_ALLOC(handle->lgh_name, strlen(name) + 1);
 849                 if (handle->lgh_name)
 850                         strcpy(handle->lgh_name, name);
 851                 else
 852                         GOTO(out, rc = -ENOMEM);
 853         } else {
 854                 LASSERTF(open_param & LLOG_OPEN_NEW, "%#x\n", open_param);
 855                 /* generate fid for new llog */
 856                 rc = local_object_fid_generate(env, los, &lgi->lgi_fid);
 857                 if (rc < 0)
 858                         GOTO(out, rc);
 859         }
 860
 861         o = ls_locate(env, ls, &lgi->lgi_fid, NULL);
 862         if (IS_ERR(o))
 863                 GOTO(out_name, rc = PTR_ERR(o));
 864
 865         /* No new llog is expected but doesn't exist */
 866         if (open_param != LLOG_OPEN_NEW && !dt_object_exists(o))
 867                 GOTO(out_put, rc = -ENOENT);
 868
 869         fid_to_logid(&lgi->lgi_fid, &handle->lgh_id);
 870         handle->lgh_obj = o;
 871         handle->private_data = los;
 872         LASSERT(handle->lgh_ctxt);
 873
 874         RETURN(rc);
 875
 876 out_put:
 877         lu_object_put(env, &o->do_lu);
 878 out_name:
 879         if (handle->lgh_name != NULL)
 880                 OBD_FREE(handle->lgh_name, strlen(name) + 1);
 881 out:
 882         dt_los_put(los);
 883         RETURN(rc);
 884 }
 885
 886 static int llog_osd_exist(struct llog_handle *handle)
 887 {
 888         LASSERT(handle->lgh_obj);
 889         return (dt_object_exists(handle->lgh_obj) &&
 890                 !lu_object_is_dying(handle->lgh_obj->do_lu.lo_header));
 891 }
 892
 893 static int llog_osd_declare_create(const struct lu_env *env,
 894                                    struct llog_handle *res, struct thandle *th)
 895 {
 896         struct llog_thread_info         *lgi = llog_info(env);
 897         struct local_oid_storage        *los;
 898         struct dt_object                *o;
 899         int                              rc;
 900
 901         ENTRY;
 902
 903         LASSERT(res->lgh_obj);
 904         LASSERT(th);
 905
 906         /* object can be created by another thread */
 907         o = res->lgh_obj;
 908         if (dt_object_exists(o))
 909                 RETURN(0);
 910
 911         los = res->private_data;
 912         LASSERT(los);
 913
 914         rc = llog_osd_declare_new_object(env, los, o, th);
 915         if (rc)
 916                 RETURN(rc);
 917
 918         /* do not declare header initialization here as it's declared
 919          * in llog_osd_declare_write_rec() which is always called */
 920
 921         if (res->lgh_name) {
 922                 struct dt_object *llog_dir;
 923
 924                 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
 925                 if (IS_ERR(llog_dir))
 926                         RETURN(PTR_ERR(llog_dir));
 927                 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
 928                 rc = dt_declare_insert(env, llog_dir,
 929                                        (struct dt_rec *)&lgi->lgi_fid,
 930                                        (struct dt_key *)res->lgh_name, th);
 931                 lu_object_put(env, &llog_dir->do_lu);
 932                 if (rc)
 933                         CERROR("%s: can't declare named llog %s: rc = %d\n",
 934                                o->do_lu.lo_dev->ld_obd->obd_name,
 935                                res->lgh_name, rc);
 936         }
 937         RETURN(rc);
 938 }
 939
 940 /* This is a callback from the llog_* functions.
 941  * Assumes caller has already pushed us into the kernel context. */
 942 static int llog_osd_create(const struct lu_env *env, struct llog_handle *res,
 943                            struct thandle *th)
 944 {
 945         struct llog_thread_info *lgi = llog_info(env);
 946         struct local_oid_storage *los;
 947         struct dt_object        *o;
 948         int                      rc = 0;
 949
 950         ENTRY;
 951
 952         LASSERT(env);
 953         o = res->lgh_obj;
 954         LASSERT(o);
 955
 956         /* llog can be already created */
 957         if (dt_object_exists(o))
 958                 RETURN(-EEXIST);
 959
 960         los = res->private_data;
 961         LASSERT(los);
 962
 963         dt_write_lock(env, o, 0);
 964         if (!dt_object_exists(o))
 965                 rc = llog_osd_create_new_object(env, los, o, th);
 966         else
 967                 rc = -EEXIST;
 968
 969         dt_write_unlock(env, o);
 970         if (rc)
 971                 RETURN(rc);
 972
 973         if (res->lgh_name) {
 974                 struct dt_object *llog_dir;
 975
 976                 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
 977                 if (IS_ERR(llog_dir))
 978                         RETURN(PTR_ERR(llog_dir));
 979
 980                 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
 981                 dt_read_lock(env, llog_dir, 0);
 982                 rc = dt_insert(env, llog_dir,
 983                                (struct dt_rec *)&lgi->lgi_fid,
 984                                (struct dt_key *)res->lgh_name,
 985                                th, BYPASS_CAPA, 1);
 986                 dt_read_unlock(env, llog_dir);
 987                 lu_object_put(env, &llog_dir->do_lu);
 988                 if (rc)
 989                         CERROR("%s: can't create named llog %s: rc = %d\n",
 990                                o->do_lu.lo_dev->ld_obd->obd_name,
 991                                res->lgh_name, rc);
 992         }
 993         RETURN(rc);
 994 }
 995
 996 static int llog_osd_close(const struct lu_env *env, struct llog_handle *handle)
 997 {
 998         struct local_oid_storage        *los;
 999         int                              rc = 0;
1000
1001         ENTRY;
1002
1003         LASSERT(handle->lgh_obj);
1004
1005         lu_object_put(env, &handle->lgh_obj->do_lu);
1006
1007         los = handle->private_data;
1008         LASSERT(los);
1009         dt_los_put(los);
1010
1011         if (handle->lgh_name)
1012                 OBD_FREE(handle->lgh_name, strlen(handle->lgh_name) + 1);
1013
1014         RETURN(rc);
1015 }
1016
1017 static int llog_osd_destroy(const struct lu_env *env,
1018                             struct llog_handle *loghandle)
1019 {
1020         struct llog_ctxt        *ctxt;
1021         struct dt_object        *o, *llog_dir = NULL;
1022         struct dt_device        *d;
1023         struct thandle          *th;
1024         char                    *name = NULL;
1025         int                      rc;
1026
1027         ENTRY;
1028
1029         ctxt = loghandle->lgh_ctxt;
1030         LASSERT(ctxt);
1031
1032         o = loghandle->lgh_obj;
1033         LASSERT(o);
1034
1035         d = lu2dt_dev(o->do_lu.lo_dev);
1036         LASSERT(d);
1037         LASSERT(d == ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt);
1038
1039         th = dt_trans_create(env, d);
1040         if (IS_ERR(th))
1041                 RETURN(PTR_ERR(th));
1042
1043         if (loghandle->lgh_name) {
1044                 llog_dir = llog_osd_dir_get(env, ctxt);
1045                 if (IS_ERR(llog_dir))
1046                         GOTO(out_trans, rc = PTR_ERR(llog_dir));
1047
1048                 name = loghandle->lgh_name;
1049                 rc = dt_declare_delete(env, llog_dir,
1050                                        (struct dt_key *)name, th);
1051                 if (rc)
1052                         GOTO(out_trans, rc);
1053         }
1054
1055         dt_declare_ref_del(env, o, th);
1056
1057         rc = dt_declare_destroy(env, o, th);
1058         if (rc)
1059                 GOTO(out_trans, rc);
1060
1061         rc = dt_trans_start_local(env, d, th);
1062         if (rc)
1063                 GOTO(out_trans, rc);
1064
1065         dt_write_lock(env, o, 0);
1066         if (dt_object_exists(o)) {
1067                 if (name) {
1068                         dt_read_lock(env, llog_dir, 0);
1069                         rc = dt_delete(env, llog_dir,
1070                                        (struct dt_key *) name,
1071                                        th, BYPASS_CAPA);
1072                         dt_read_unlock(env, llog_dir);
1073                         if (rc) {
1074                                 CERROR("%s: can't remove llog %s: rc = %d\n",
1075                                        o->do_lu.lo_dev->ld_obd->obd_name,
1076                                        name, rc);
1077                                 GOTO(out_unlock, rc);
1078                         }
1079                 }
1080                 dt_ref_del(env, o, th);
1081                 rc = dt_destroy(env, o, th);
1082                 if (rc)
1083                         GOTO(out_unlock, rc);
1084         }
1085 out_unlock:
1086         dt_write_unlock(env, o);
1087 out_trans:
1088         dt_trans_stop(env, d, th);
1089         if (llog_dir != NULL)
1090                 lu_object_put(env, &llog_dir->do_lu);
1091         RETURN(rc);
1092 }
1093
1094 static int llog_osd_setup(const struct lu_env *env, struct obd_device *obd,
1095                           struct obd_llog_group *olg, int ctxt_idx,
1096                           struct obd_device *disk_obd)
1097 {
1098         struct llog_thread_info         *lgi = llog_info(env);
1099         struct llog_ctxt                *ctxt;
1100         int                              rc = 0;
1101         ENTRY;
1102
1103         LASSERT(obd);
1104         LASSERT(olg->olg_ctxts[ctxt_idx]);
1105
1106         ctxt = llog_ctxt_get(olg->olg_ctxts[ctxt_idx]);
1107         LASSERT(ctxt);
1108
1109         /* initialize data allowing to generate new fids,
1110          * literally we need a sequece */
1111         lgi->lgi_fid.f_seq = FID_SEQ_LLOG;
1112         lgi->lgi_fid.f_oid = 1;
1113         lgi->lgi_fid.f_ver = 0;
1114         rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1115                                     &lgi->lgi_fid,
1116                                     &ctxt->loc_los_nameless);
1117         if (rc != 0)
1118                 GOTO(out, rc);
1119
1120         lgi->lgi_fid.f_seq = FID_SEQ_LLOG_NAME;
1121         lgi->lgi_fid.f_oid = 1;
1122         lgi->lgi_fid.f_ver = 0;
1123         rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1124                                     &lgi->lgi_fid,
1125                                     &ctxt->loc_los_named);
1126         if (rc != 0) {
1127                 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1128                 ctxt->loc_los_nameless = NULL;
1129         }
1130
1131         GOTO(out, rc);
1132
1133 out:
1134         llog_ctxt_put(ctxt);
1135         return rc;
1136 }
1137
1138 static int llog_osd_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
1139 {
1140         if (ctxt->loc_los_nameless != NULL) {
1141                 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1142                 ctxt->loc_los_nameless = NULL;
1143         }
1144
1145         if (ctxt->loc_los_named != NULL) {
1146                 local_oid_storage_fini(env, ctxt->loc_los_named);
1147                 ctxt->loc_los_named = NULL;
1148         }
1149
1150         return 0;
1151 }
1152
1153 struct llog_operations llog_osd_ops = {
1154         .lop_next_block         = llog_osd_next_block,
1155         .lop_prev_block         = llog_osd_prev_block,
1156         .lop_read_header        = llog_osd_read_header,
1157         .lop_destroy            = llog_osd_destroy,
1158         .lop_setup              = llog_osd_setup,
1159         .lop_cleanup            = llog_osd_cleanup,
1160         .lop_open               = llog_osd_open,
1161         .lop_exist              = llog_osd_exist,
1162         .lop_declare_create     = llog_osd_declare_create,
1163         .lop_create             = llog_osd_create,
1164         .lop_declare_write_rec  = llog_osd_declare_write_rec,
1165         .lop_write_rec          = llog_osd_write_rec,
1166         .lop_close              = llog_osd_close,
1167 };
1168 EXPORT_SYMBOL(llog_osd_ops);
1169
1170 /* reads the catalog list */
1171 int llog_osd_get_cat_list(const struct lu_env *env, struct dt_device *d,
1172                           int idx, int count, struct llog_catid *idarray,
1173                           const struct lu_fid *fid)
1174 {
1175         struct llog_thread_info *lgi = llog_info(env);
1176         struct dt_object        *o = NULL;
1177         struct thandle          *th;
1178         int                      rc, size;
1179
1180         ENTRY;
1181
1182         LASSERT(d);
1183
1184         size = sizeof(*idarray) * count;
1185         lgi->lgi_off = idx *  sizeof(*idarray);
1186
1187         lgi->lgi_fid = *fid;
1188         o = dt_locate(env, d, &lgi->lgi_fid);
1189         if (IS_ERR(o))
1190                 RETURN(PTR_ERR(o));
1191
1192         if (!dt_object_exists(o)) {
1193                 th = dt_trans_create(env, d);
1194                 if (IS_ERR(th))
1195                         GOTO(out, rc = PTR_ERR(th));
1196
1197                 lgi->lgi_attr.la_valid = LA_MODE;
1198                 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1199                 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1200
1201                 rc = dt_declare_create(env, o, &lgi->lgi_attr, NULL,
1202                                        &lgi->lgi_dof, th);
1203                 if (rc)
1204                         GOTO(out_trans, rc);
1205
1206                 rc = dt_trans_start_local(env, d, th);
1207                 if (rc)
1208                         GOTO(out_trans, rc);
1209
1210                 dt_write_lock(env, o, 0);
1211                 if (!dt_object_exists(o))
1212                         rc = dt_create(env, o, &lgi->lgi_attr, NULL,
1213                                        &lgi->lgi_dof, th);
1214                 dt_write_unlock(env, o);
1215 out_trans:
1216                 dt_trans_stop(env, d, th);
1217                 if (rc)
1218                         GOTO(out, rc);
1219         }
1220
1221         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
1222         if (rc)
1223                 GOTO(out, rc);
1224
1225         if (!S_ISREG(lgi->lgi_attr.la_mode)) {
1226                 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
1227                        o->do_lu.lo_dev->ld_obd->obd_name,
1228                        lgi->lgi_attr.la_mode);
1229                 GOTO(out, rc = -ENOENT);
1230         }
1231
1232         CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
1233                (int)lgi->lgi_attr.la_size, size);
1234
1235         /* return just number of llogs */
1236         if (idarray == NULL) {
1237                 rc = lgi->lgi_attr.la_size / sizeof(*idarray);
1238                 GOTO(out, rc);
1239         }
1240
1241         /* read for new ost index or for empty file */
1242         memset(idarray, 0, size);
1243         if (lgi->lgi_attr.la_size < lgi->lgi_off + size)
1244                 GOTO(out, rc = 0);
1245         if (lgi->lgi_attr.la_size < lgi->lgi_off + size)
1246                 size = lgi->lgi_attr.la_size - lgi->lgi_off;
1247
1248         lgi->lgi_buf.lb_buf = idarray;
1249         lgi->lgi_buf.lb_len = size;
1250         rc = dt_record_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
1251         if (rc) {
1252                 CERROR("%s: error reading CATALOGS: rc = %d\n",
1253                        o->do_lu.lo_dev->ld_obd->obd_name,  rc);
1254                 GOTO(out, rc);
1255         }
1256
1257         EXIT;
1258 out:
1259         lu_object_put(env, &o->do_lu);
1260         RETURN(rc);
1261 }
1262 EXPORT_SYMBOL(llog_osd_get_cat_list);
1263
1264 /* writes the cat list */
1265 int llog_osd_put_cat_list(const struct lu_env *env, struct dt_device *d,
1266                           int idx, int count, struct llog_catid *idarray,
1267                           const struct lu_fid *fid)
1268 {
1269         struct llog_thread_info *lgi = llog_info(env);
1270         struct dt_object        *o = NULL;
1271         struct thandle          *th;
1272         int                      rc, size;
1273
1274         if (!count)
1275                 RETURN(0);
1276
1277         LASSERT(d);
1278
1279         size = sizeof(*idarray) * count;
1280         lgi->lgi_off = idx * sizeof(*idarray);
1281         lgi->lgi_fid = *fid;
1282
1283         o = dt_locate(env, d, &lgi->lgi_fid);
1284         if (IS_ERR(o))
1285                 RETURN(PTR_ERR(o));
1286
1287         if (!dt_object_exists(o))
1288                 GOTO(out, rc = -ENOENT);
1289
1290         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
1291         if (rc)
1292                 GOTO(out, rc);
1293
1294         if (!S_ISREG(lgi->lgi_attr.la_mode)) {
1295                 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
1296                        o->do_lu.lo_dev->ld_obd->obd_name,
1297                        lgi->lgi_attr.la_mode);
1298                 GOTO(out, rc = -ENOENT);
1299         }
1300
1301         th = dt_trans_create(env, d);
1302         if (IS_ERR(th))
1303                 GOTO(out, rc = PTR_ERR(th));
1304
1305         lgi->lgi_buf.lb_len = size;
1306         lgi->lgi_buf.lb_buf = idarray;
1307         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, lgi->lgi_off, th);
1308         if (rc)
1309                 GOTO(out, rc);
1310
1311         rc = dt_trans_start_local(env, d, th);
1312         if (rc)
1313                 GOTO(out_trans, rc);
1314
1315         rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
1316         if (rc)
1317                 CDEBUG(D_INODE, "error writeing CATALOGS: rc = %d\n", rc);
1318 out_trans:
1319         dt_trans_stop(env, d, th);
1320 out:
1321         lu_object_put(env, &o->do_lu);
1322         RETURN(rc);
1323 }
1324 EXPORT_SYMBOL(llog_osd_put_cat_list);