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
 287         o = loghandle->lgh_obj;
 288         LASSERT(o);
 289
 290         lgi->lgi_buf.lb_len = sizeof(struct llog_log_hdr);
 291         lgi->lgi_buf.lb_buf = NULL;
 292         /* each time we update header */
 293         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, 0,
 294                                      th);
 295         if (rc || idx == 0) /* if error or just header */
 296                 RETURN(rc);
 297
 298         if (dt_object_exists(o)) {
 299                 rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
 300                 lgi->lgi_off = lgi->lgi_attr.la_size;
 301                 LASSERT(ergo(rc == 0, lgi->lgi_attr.la_valid & LA_SIZE));
 302                 if (rc)
 303                         RETURN(rc);
 304
 305                 rc = dt_declare_punch(env, o, lgi->lgi_off, OBD_OBJECT_EOF, th);
 306                 if (rc)
 307                         RETURN(rc);
 308         } else {
 309                 lgi->lgi_off = 0;
 310         }
 311
 312         lgi->lgi_buf.lb_len = 32 * 1024;
 313         lgi->lgi_buf.lb_buf = NULL;
 314         /* XXX: implement declared window or multi-chunks approach */
 315         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, lgi->lgi_off, th);
 316
 317         RETURN(rc);
 318 }
 319
 320 /* returns negative in on error; 0 if success && reccookie == 0; 1 otherwise */
 321 /* appends if idx == -1, otherwise overwrites record idx. */
 322 static int llog_osd_write_rec(const struct lu_env *env,
 323                               struct llog_handle *loghandle,
 324                               struct llog_rec_hdr *rec,
 325                               struct llog_cookie *reccookie, int cookiecount,
 326                               void *buf, int idx, struct thandle *th)
 327 {
 328         struct llog_thread_info *lgi = llog_info(env);
 329         struct llog_log_hdr     *llh;
 330         int                      reclen = rec->lrh_len;
 331         int                      index, rc, old_tail_idx;
 332         struct llog_rec_tail    *lrt;
 333         struct dt_object        *o;
 334         size_t                   left;
 335
 336         ENTRY;
 337
 338         LASSERT(env);
 339         llh = loghandle->lgh_hdr;
 340         LASSERT(llh);
 341         o = loghandle->lgh_obj;
 342         LASSERT(o);
 343         LASSERT(th);
 344
 345         CDEBUG(D_OTHER, "new record %x to "DFID"\n",
 346                rec->lrh_type, PFID(lu_object_fid(&o->do_lu)));
 347
 348         /* record length should not bigger than LLOG_CHUNK_SIZE */
 349         if (buf)
 350                 rc = (reclen > LLOG_CHUNK_SIZE - sizeof(struct llog_rec_hdr) -
 351                       sizeof(struct llog_rec_tail)) ? -E2BIG : 0;
 352         else
 353                 rc = (reclen > LLOG_CHUNK_SIZE) ? -E2BIG : 0;
 354         if (rc)
 355                 RETURN(rc);
 356
 357         rc = dt_attr_get(env, o, &lgi->lgi_attr, NULL);
 358         if (rc)
 359                 RETURN(rc);
 360
 361         if (buf)
 362                 /* write_blob adds header and tail to lrh_len. */
 363                 reclen = sizeof(*rec) + rec->lrh_len +
 364                          sizeof(struct llog_rec_tail);
 365
 366         if (idx != -1) {
 367                 /* no header: only allowed to insert record 1 */
 368                 if (idx != 1 && lgi->lgi_attr.la_size == 0)
 369                         LBUG();
 370
 371                 if (idx && llh->llh_size && llh->llh_size != rec->lrh_len)
 372                         RETURN(-EINVAL);
 373
 374                 if (!ext2_test_bit(idx, llh->llh_bitmap))
 375                         CERROR("%s: modify unset record %u\n",
 376                                o->do_lu.lo_dev->ld_obd->obd_name, idx);
 377                 if (idx != rec->lrh_index)
 378                         CERROR("%s: index mismatch %d %u\n",
 379                                o->do_lu.lo_dev->ld_obd->obd_name, idx,
 380                                rec->lrh_index);
 381
 382                 lgi->lgi_off = 0;
 383                 rc = llog_osd_write_blob(env, o, &llh->llh_hdr, NULL,
 384                                          &lgi->lgi_off, th);
 385                 /* we are done if we only write the header or on error */
 386                 if (rc || idx == 0)
 387                         RETURN(rc);
 388
 389                 if (buf) {
 390                         /* We assume that caller has set lgh_cur_* */
 391                         lgi->lgi_off = loghandle->lgh_cur_offset;
 392                         CDEBUG(D_OTHER,
 393                                "modify record "DOSTID": idx:%d/%u/%d, len:%u "
 394                                "offset %llu\n",
 395                                POSTID(&loghandle->lgh_id.lgl_oi), idx,
 396                                rec->lrh_index,
 397                                loghandle->lgh_cur_idx, rec->lrh_len,
 398                                (long long)(lgi->lgi_off - sizeof(*llh)));
 399                         if (rec->lrh_index != loghandle->lgh_cur_idx) {
 400                                 CERROR("%s: modify idx mismatch %u/%d\n",
 401                                        o->do_lu.lo_dev->ld_obd->obd_name, idx,
 402                                        loghandle->lgh_cur_idx);
 403                                 RETURN(-EFAULT);
 404                         }
 405                 } else {
 406                         /* Assumes constant lrh_len */
 407                         lgi->lgi_off = sizeof(*llh) + (idx - 1) * reclen;
 408                 }
 409
 410                 rc = llog_osd_write_blob(env, o, rec, buf, &lgi->lgi_off, th);
 411                 if (rc == 0 && reccookie) {
 412                         reccookie->lgc_lgl = loghandle->lgh_id;
 413                         reccookie->lgc_index = idx;
 414                         rc = 1;
 415                 }
 416                 RETURN(rc);
 417         }
 418
 419         /* Make sure that records don't cross a chunk boundary, so we can
 420          * process them page-at-a-time if needed.  If it will cross a chunk
 421          * boundary, write in a fake (but referenced) entry to pad the chunk.
 422          *
 423          * We know that llog_current_log() will return a loghandle that is
 424          * big enough to hold reclen, so all we care about is padding here.
 425          */
 426         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 427         lgi->lgi_off = lgi->lgi_attr.la_size;
 428         left = LLOG_CHUNK_SIZE - (lgi->lgi_off & (LLOG_CHUNK_SIZE - 1));
 429         /* NOTE: padding is a record, but no bit is set */
 430         if (left != 0 && left != reclen &&
 431             left < (reclen + LLOG_MIN_REC_SIZE)) {
 432                 index = loghandle->lgh_last_idx + 1;
 433                 rc = llog_osd_pad(env, o, &lgi->lgi_off, left, index, th);
 434                 if (rc)
 435                         RETURN(rc);
 436                 loghandle->lgh_last_idx++; /*for pad rec*/
 437         }
 438         /* if it's the last idx in log file, then return -ENOSPC */
 439         if (loghandle->lgh_last_idx >= LLOG_BITMAP_SIZE(llh) - 1)
 440                 RETURN(-ENOSPC);
 441
 442         loghandle->lgh_last_idx++;
 443         index = loghandle->lgh_last_idx;
 444         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 445         rec->lrh_index = index;
 446         if (buf == NULL) {
 447                 lrt = (struct llog_rec_tail *)((char *)rec + rec->lrh_len -
 448                                                sizeof(*lrt));
 449                 lrt->lrt_len = rec->lrh_len;
 450                 lrt->lrt_index = rec->lrh_index;
 451         }
 452         /* The caller should make sure only 1 process access the lgh_last_idx,
 453          * Otherwise it might hit the assert.*/
 454         LASSERT(index < LLOG_BITMAP_SIZE(llh));
 455         spin_lock(&loghandle->lgh_hdr_lock);
 456         if (ext2_set_bit(index, llh->llh_bitmap)) {
 457                 CERROR("%s: index %u already set in log bitmap\n",
 458                        o->do_lu.lo_dev->ld_obd->obd_name, index);
 459                 spin_unlock(&loghandle->lgh_hdr_lock);
 460                 LBUG(); /* should never happen */
 461         }
 462         llh->llh_count++;
 463         spin_unlock(&loghandle->lgh_hdr_lock);
 464         old_tail_idx = llh->llh_tail.lrt_index;
 465         llh->llh_tail.lrt_index = index;
 466
 467         lgi->lgi_off = 0;
 468         rc = llog_osd_write_blob(env, o, &llh->llh_hdr, NULL, &lgi->lgi_off,
 469                                  th);
 470         if (rc)
 471                 GOTO(out, rc);
 472
 473         rc = dt_attr_get(env, o, &lgi->lgi_attr, NULL);
 474         if (rc)
 475                 GOTO(out, rc);
 476
 477         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 478         lgi->lgi_off = lgi->lgi_attr.la_size;
 479
 480         rc = llog_osd_write_blob(env, o, rec, buf, &lgi->lgi_off, th);
 481
 482 out:
 483         /* cleanup llog for error case */
 484         if (rc) {
 485                 spin_lock(&loghandle->lgh_hdr_lock);
 486                 ext2_clear_bit(index, llh->llh_bitmap);
 487                 llh->llh_count--;
 488                 spin_unlock(&loghandle->lgh_hdr_lock);
 489
 490                 /* restore the header */
 491                 loghandle->lgh_last_idx--;
 492                 llh->llh_tail.lrt_index = old_tail_idx;
 493                 lgi->lgi_off = 0;
 494                 llog_osd_write_blob(env, o, &llh->llh_hdr, NULL,
 495                                     &lgi->lgi_off, th);
 496         }
 497
 498         CDEBUG(D_RPCTRACE, "added record "DOSTID": idx: %u, %u\n",
 499                POSTID(&loghandle->lgh_id.lgl_oi), index, rec->lrh_len);
 500         if (rc == 0 && reccookie) {
 501                 reccookie->lgc_lgl = loghandle->lgh_id;
 502                 reccookie->lgc_index = index;
 503                 if ((rec->lrh_type == MDS_UNLINK_REC) ||
 504                     (rec->lrh_type == MDS_SETATTR64_REC))
 505                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 506                 else if (rec->lrh_type == OST_SZ_REC)
 507                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 508                 else
 509                         reccookie->lgc_subsys = -1;
 510                 rc = 1;
 511         }
 512         RETURN(rc);
 513 }
 514
 515 /* We can skip reading at least as many log blocks as the number of
 516  * minimum sized log records we are skipping.  If it turns out
 517  * that we are not far enough along the log (because the
 518  * actual records are larger than minimum size) we just skip
 519  * some more records.
 520  */
 521 static void llog_skip_over(__u64 *off, int curr, int goal)
 522 {
 523         if (goal <= curr)
 524                 return;
 525         *off = (*off + (goal - curr - 1) * LLOG_MIN_REC_SIZE) &
 526                 ~(LLOG_CHUNK_SIZE - 1);
 527 }
 528
 529 /* sets:
 530  *  - cur_offset to the furthest point read in the log file
 531  *  - cur_idx to the log index preceeding cur_offset
 532  * returns -EIO/-EINVAL on error
 533  */
 534 static int llog_osd_next_block(const struct lu_env *env,
 535                                struct llog_handle *loghandle, int *cur_idx,
 536                                int next_idx, __u64 *cur_offset, void *buf,
 537                                int len)
 538 {
 539         struct llog_thread_info *lgi = llog_info(env);
 540         struct dt_object        *o;
 541         struct dt_device        *dt;
 542         int                      rc;
 543
 544         ENTRY;
 545
 546         LASSERT(env);
 547         LASSERT(lgi);
 548
 549         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 550                 RETURN(-EINVAL);
 551
 552         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 553                next_idx, *cur_idx, *cur_offset);
 554
 555         LASSERT(loghandle);
 556         LASSERT(loghandle->lgh_ctxt);
 557
 558         o = loghandle->lgh_obj;
 559         LASSERT(o);
 560         LASSERT(dt_object_exists(o));
 561         dt = lu2dt_dev(o->do_lu.lo_dev);
 562         LASSERT(dt);
 563
 564         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
 565         if (rc)
 566                 GOTO(out, rc);
 567
 568         while (*cur_offset < lgi->lgi_attr.la_size) {
 569                 struct llog_rec_hdr     *rec, *last_rec;
 570                 struct llog_rec_tail    *tail;
 571
 572                 llog_skip_over(cur_offset, *cur_idx, next_idx);
 573
 574                 /* read up to next LLOG_CHUNK_SIZE block */
 575                 lgi->lgi_buf.lb_len = LLOG_CHUNK_SIZE -
 576                                       (*cur_offset & (LLOG_CHUNK_SIZE - 1));
 577                 lgi->lgi_buf.lb_buf = buf;
 578
 579                 /* Note: read lock is not needed around la_size get above at
 580                  * the time of dt_attr_get(). There are only two cases that
 581                  * matter. Either la_size == cur_offset, in which case the
 582                  * entire read is skipped, or la_size > cur_offset and the loop
 583                  * is entered and this thread is blocked at dt_read_lock()
 584                  * until the write is completed. When the write completes, then
 585                  * the dt_read() will be done with the full length, and will
 586                  * get the full data.
 587                  */
 588                 dt_read_lock(env, o, 0);
 589                 rc = dt_read(env, o, &lgi->lgi_buf, cur_offset);
 590                 dt_read_unlock(env, o);
 591                 if (rc < 0) {
 592                         CERROR("%s: can't read llog block from log "DFID
 593                                " offset "LPU64": rc = %d\n",
 594                                o->do_lu.lo_dev->ld_obd->obd_name,
 595                                PFID(lu_object_fid(&o->do_lu)), *cur_offset,
 596                                rc);
 597                         GOTO(out, rc);
 598                 }
 599
 600                 if (rc < len) {
 601                         /* signal the end of the valid buffer to
 602                          * llog_process */
 603                         memset(buf + rc, 0, len - rc);
 604                 }
 605
 606                 if (rc == 0) /* end of file, nothing to do */
 607                         GOTO(out, rc);
 608
 609                 if (rc < sizeof(*tail)) {
 610                         CERROR("%s: invalid llog block at log id "DOSTID"/%u "
 611                                "offset "LPU64"\n",
 612                                o->do_lu.lo_dev->ld_obd->obd_name,
 613                                POSTID(&loghandle->lgh_id.lgl_oi),
 614                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 615                         GOTO(out, rc = -EINVAL);
 616                 }
 617
 618                 rec = buf;
 619                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 620                         lustre_swab_llog_rec(rec);
 621
 622                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 623                                                 sizeof(struct llog_rec_tail));
 624                 /* get the last record in block */
 625                 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
 626                                                    le32_to_cpu(tail->lrt_len));
 627
 628                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 629                         lustre_swab_llog_rec(last_rec);
 630                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 631
 632                 *cur_idx = tail->lrt_index;
 633
 634                 /* this shouldn't happen */
 635                 if (tail->lrt_index == 0) {
 636                         CERROR("%s: invalid llog tail at log id "DOSTID"/%u "
 637                                "offset "LPU64"\n",
 638                                o->do_lu.lo_dev->ld_obd->obd_name,
 639                                POSTID(&loghandle->lgh_id.lgl_oi),
 640                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 641                         GOTO(out, rc = -EINVAL);
 642                 }
 643                 if (tail->lrt_index < next_idx)
 644                         continue;
 645
 646                 /* sanity check that the start of the new buffer is no farther
 647                  * than the record that we wanted.  This shouldn't happen. */
 648                 if (rec->lrh_index > next_idx) {
 649                         CERROR("%s: missed desired record? %u > %u\n",
 650                                o->do_lu.lo_dev->ld_obd->obd_name,
 651                                rec->lrh_index, next_idx);
 652                         GOTO(out, rc = -ENOENT);
 653                 }
 654                 GOTO(out, rc = 0);
 655         }
 656         GOTO(out, rc = -EIO);
 657 out:
 658         return rc;
 659 }
 660
 661 static int llog_osd_prev_block(const struct lu_env *env,
 662                                struct llog_handle *loghandle,
 663                                int prev_idx, void *buf, int len)
 664 {
 665         struct llog_thread_info *lgi = llog_info(env);
 666         struct dt_object        *o;
 667         struct dt_device        *dt;
 668         loff_t                   cur_offset;
 669         int                      rc;
 670
 671         ENTRY;
 672
 673         if (len == 0 || len & (LLOG_CHUNK_SIZE - 1))
 674                 RETURN(-EINVAL);
 675
 676         CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
 677
 678         LASSERT(loghandle);
 679         LASSERT(loghandle->lgh_ctxt);
 680
 681         o = loghandle->lgh_obj;
 682         LASSERT(o);
 683         LASSERT(dt_object_exists(o));
 684         dt = lu2dt_dev(o->do_lu.lo_dev);
 685         LASSERT(dt);
 686
 687         cur_offset = LLOG_CHUNK_SIZE;
 688         llog_skip_over(&cur_offset, 0, prev_idx);
 689
 690         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
 691         if (rc)
 692                 GOTO(out, rc);
 693
 694         while (cur_offset < lgi->lgi_attr.la_size) {
 695                 struct llog_rec_hdr     *rec, *last_rec;
 696                 struct llog_rec_tail    *tail;
 697
 698                 lgi->lgi_buf.lb_len = len;
 699                 lgi->lgi_buf.lb_buf = buf;
 700                 /* It is OK to have locking around dt_read() only, see
 701                  * comment in llog_osd_next_block for details
 702                  */
 703                 dt_read_lock(env, o, 0);
 704                 rc = dt_read(env, o, &lgi->lgi_buf, &cur_offset);
 705                 dt_read_unlock(env, o);
 706                 if (rc < 0) {
 707                         CERROR("%s: can't read llog block from log "DFID
 708                                " offset "LPU64": rc = %d\n",
 709                                o->do_lu.lo_dev->ld_obd->obd_name,
 710                                PFID(lu_object_fid(&o->do_lu)), cur_offset, rc);
 711                         GOTO(out, rc);
 712                 }
 713
 714                 if (rc == 0) /* end of file, nothing to do */
 715                         GOTO(out, rc);
 716
 717                 if (rc < sizeof(*tail)) {
 718                         CERROR("%s: invalid llog block at log id "DOSTID"/%u "
 719                                "offset "LPU64"\n",
 720                                o->do_lu.lo_dev->ld_obd->obd_name,
 721                                POSTID(&loghandle->lgh_id.lgl_oi),
 722                                loghandle->lgh_id.lgl_ogen, cur_offset);
 723                         GOTO(out, rc = -EINVAL);
 724                 }
 725
 726                 rec = buf;
 727                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 728                         lustre_swab_llog_rec(rec);
 729
 730                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 731                                                 sizeof(struct llog_rec_tail));
 732                 /* get the last record in block */
 733                 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
 734                                                    le32_to_cpu(tail->lrt_len));
 735
 736                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 737                         lustre_swab_llog_rec(last_rec);
 738                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 739
 740                 /* this shouldn't happen */
 741                 if (tail->lrt_index == 0) {
 742                         CERROR("%s: invalid llog tail at log id "DOSTID"/%u "
 743                                "offset "LPU64"\n",
 744                                o->do_lu.lo_dev->ld_obd->obd_name,
 745                                POSTID(&loghandle->lgh_id.lgl_oi),
 746                                loghandle->lgh_id.lgl_ogen, cur_offset);
 747                         GOTO(out, rc = -EINVAL);
 748                 }
 749                 if (tail->lrt_index < prev_idx)
 750                         continue;
 751
 752                 /* sanity check that the start of the new buffer is no farther
 753                  * than the record that we wanted.  This shouldn't happen. */
 754                 if (rec->lrh_index > prev_idx) {
 755                         CERROR("%s: missed desired record? %u > %u\n",
 756                                o->do_lu.lo_dev->ld_obd->obd_name,
 757                                rec->lrh_index, prev_idx);
 758                         GOTO(out, rc = -ENOENT);
 759                 }
 760                 GOTO(out, rc = 0);
 761         }
 762         GOTO(out, rc = -EIO);
 763 out:
 764         return rc;
 765 }
 766
 767 struct dt_object *llog_osd_dir_get(const struct lu_env *env,
 768                                    struct llog_ctxt *ctxt)
 769 {
 770         struct dt_device        *dt;
 771         struct dt_thread_info   *dti = dt_info(env);
 772         struct dt_object        *dir;
 773         int                      rc;
 774
 775         dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
 776         if (ctxt->loc_dir == NULL) {
 777                 rc = dt_root_get(env, dt, &dti->dti_fid);
 778                 if (rc)
 779                         return ERR_PTR(rc);
 780                 dir = dt_locate(env, dt, &dti->dti_fid);
 781
 782                 if (!IS_ERR(dir) && !dt_try_as_dir(env, dir)) {
 783                         lu_object_put(env, &dir->do_lu);
 784                         return ERR_PTR(-ENOTDIR);
 785                 }
 786         } else {
 787                 lu_object_get(&ctxt->loc_dir->do_lu);
 788                 dir = ctxt->loc_dir;
 789         }
 790
 791         return dir;
 792 }
 793
 794 static int llog_osd_open(const struct lu_env *env, struct llog_handle *handle,
 795                          struct llog_logid *logid, char *name,
 796                          enum llog_open_param open_param)
 797 {
 798         struct llog_thread_info         *lgi = llog_info(env);
 799         struct llog_ctxt                *ctxt = handle->lgh_ctxt;
 800         struct dt_object                *o;
 801         struct dt_device                *dt;
 802         struct ls_device                *ls;
 803         struct local_oid_storage        *los;
 804         int                              rc = 0;
 805
 806         ENTRY;
 807
 808         LASSERT(env);
 809         LASSERT(ctxt);
 810         LASSERT(ctxt->loc_exp);
 811         LASSERT(ctxt->loc_exp->exp_obd);
 812         dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
 813         LASSERT(dt);
 814
 815         ls = ls_device_get(dt);
 816         if (IS_ERR(ls))
 817                 RETURN(PTR_ERR(ls));
 818
 819         mutex_lock(&ls->ls_los_mutex);
 820         los = dt_los_find(ls, name != NULL ? FID_SEQ_LLOG_NAME : FID_SEQ_LLOG);
 821         mutex_unlock(&ls->ls_los_mutex);
 822         LASSERT(los);
 823         ls_device_put(env, ls);
 824
 825         LASSERT(handle);
 826
 827         if (logid != NULL) {
 828                 logid_to_fid(logid, &lgi->lgi_fid);
 829         } else if (name) {
 830                 struct dt_object *llog_dir;
 831
 832                 llog_dir = llog_osd_dir_get(env, ctxt);
 833                 if (IS_ERR(llog_dir))
 834                         GOTO(out, rc = PTR_ERR(llog_dir));
 835                 dt_read_lock(env, llog_dir, 0);
 836                 rc = dt_lookup_dir(env, llog_dir, name, &lgi->lgi_fid);
 837                 dt_read_unlock(env, llog_dir);
 838                 lu_object_put(env, &llog_dir->do_lu);
 839                 if (rc == -ENOENT && open_param == LLOG_OPEN_NEW) {
 840                         /* generate fid for new llog */
 841                         rc = local_object_fid_generate(env, los,
 842                                                        &lgi->lgi_fid);
 843                 }
 844                 if (rc < 0)
 845                         GOTO(out, rc);
 846                 OBD_ALLOC(handle->lgh_name, strlen(name) + 1);
 847                 if (handle->lgh_name)
 848                         strcpy(handle->lgh_name, name);
 849                 else
 850                         GOTO(out, rc = -ENOMEM);
 851         } else {
 852                 LASSERTF(open_param & LLOG_OPEN_NEW, "%#x\n", open_param);
 853                 /* generate fid for new llog */
 854                 rc = local_object_fid_generate(env, los, &lgi->lgi_fid);
 855                 if (rc < 0)
 856                         GOTO(out, rc);
 857         }
 858
 859         o = ls_locate(env, ls, &lgi->lgi_fid, NULL);
 860         if (IS_ERR(o))
 861                 GOTO(out_name, rc = PTR_ERR(o));
 862
 863         /* No new llog is expected but doesn't exist */
 864         if (open_param != LLOG_OPEN_NEW && !dt_object_exists(o))
 865                 GOTO(out_put, rc = -ENOENT);
 866
 867         fid_to_logid(&lgi->lgi_fid, &handle->lgh_id);
 868         handle->lgh_obj = o;
 869         handle->private_data = los;
 870         LASSERT(handle->lgh_ctxt);
 871
 872         RETURN(rc);
 873
 874 out_put:
 875         lu_object_put(env, &o->do_lu);
 876 out_name:
 877         if (handle->lgh_name != NULL)
 878                 OBD_FREE(handle->lgh_name, strlen(name) + 1);
 879 out:
 880         dt_los_put(los);
 881         RETURN(rc);
 882 }
 883
 884 static int llog_osd_exist(struct llog_handle *handle)
 885 {
 886         LASSERT(handle->lgh_obj);
 887         return (dt_object_exists(handle->lgh_obj) &&
 888                 !lu_object_is_dying(handle->lgh_obj->do_lu.lo_header));
 889 }
 890
 891 static int llog_osd_declare_create(const struct lu_env *env,
 892                                    struct llog_handle *res, struct thandle *th)
 893 {
 894         struct llog_thread_info         *lgi = llog_info(env);
 895         struct local_oid_storage        *los;
 896         struct dt_object                *o;
 897         int                              rc;
 898
 899         ENTRY;
 900
 901         LASSERT(res->lgh_obj);
 902         LASSERT(th);
 903
 904         /* object can be created by another thread */
 905         o = res->lgh_obj;
 906         if (dt_object_exists(o))
 907                 RETURN(0);
 908
 909         los = res->private_data;
 910         LASSERT(los);
 911
 912         rc = llog_osd_declare_new_object(env, los, o, th);
 913         if (rc)
 914                 RETURN(rc);
 915
 916         lgi->lgi_buf.lb_len = LLOG_CHUNK_SIZE;
 917         lgi->lgi_buf.lb_buf = NULL;
 918         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, 0, th);
 919         if (rc)
 920                 RETURN(rc);
 921
 922         if (res->lgh_name) {
 923                 struct dt_object *llog_dir;
 924
 925                 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
 926                 if (IS_ERR(llog_dir))
 927                         RETURN(PTR_ERR(llog_dir));
 928                 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
 929                 rc = dt_declare_insert(env, llog_dir,
 930                                        (struct dt_rec *)&lgi->lgi_fid,
 931                                        (struct dt_key *)res->lgh_name, th);
 932                 lu_object_put(env, &llog_dir->do_lu);
 933                 if (rc)
 934                         CERROR("%s: can't declare named llog %s: rc = %d\n",
 935                                o->do_lu.lo_dev->ld_obd->obd_name,
 936                                res->lgh_name, rc);
 937         }
 938         RETURN(rc);
 939 }
 940
 941 /* This is a callback from the llog_* functions.
 942  * Assumes caller has already pushed us into the kernel context. */
 943 static int llog_osd_create(const struct lu_env *env, struct llog_handle *res,
 944                            struct thandle *th)
 945 {
 946         struct llog_thread_info *lgi = llog_info(env);
 947         struct local_oid_storage *los;
 948         struct dt_object        *o;
 949         int                      rc = 0;
 950
 951         ENTRY;
 952
 953         LASSERT(env);
 954         o = res->lgh_obj;
 955         LASSERT(o);
 956
 957         /* llog can be already created */
 958         if (dt_object_exists(o))
 959                 RETURN(-EEXIST);
 960
 961         los = res->private_data;
 962         LASSERT(los);
 963
 964         dt_write_lock(env, o, 0);
 965         if (!dt_object_exists(o))
 966                 rc = llog_osd_create_new_object(env, los, o, th);
 967         else
 968                 rc = -EEXIST;
 969
 970         dt_write_unlock(env, o);
 971         if (rc)
 972                 RETURN(rc);
 973
 974         if (res->lgh_name) {
 975                 struct dt_object *llog_dir;
 976
 977                 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
 978                 if (IS_ERR(llog_dir))
 979                         RETURN(PTR_ERR(llog_dir));
 980
 981                 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
 982                 dt_read_lock(env, llog_dir, 0);
 983                 rc = dt_insert(env, llog_dir,
 984                                (struct dt_rec *)&lgi->lgi_fid,
 985                                (struct dt_key *)res->lgh_name,
 986                                th, BYPASS_CAPA, 1);
 987                 dt_read_unlock(env, llog_dir);
 988                 lu_object_put(env, &llog_dir->do_lu);
 989                 if (rc)
 990                         CERROR("%s: can't create named llog %s: rc = %d\n",
 991                                o->do_lu.lo_dev->ld_obd->obd_name,
 992                                res->lgh_name, rc);
 993         }
 994         RETURN(rc);
 995 }
 996
 997 static int llog_osd_close(const struct lu_env *env, struct llog_handle *handle)
 998 {
 999         struct local_oid_storage        *los;
1000         int                              rc = 0;
1001
1002         ENTRY;
1003
1004         LASSERT(handle->lgh_obj);
1005
1006         lu_object_put(env, &handle->lgh_obj->do_lu);
1007
1008         los = handle->private_data;
1009         LASSERT(los);
1010         dt_los_put(los);
1011
1012         if (handle->lgh_name)
1013                 OBD_FREE(handle->lgh_name, strlen(handle->lgh_name) + 1);
1014
1015         RETURN(rc);
1016 }
1017
1018 static int llog_osd_destroy(const struct lu_env *env,
1019                             struct llog_handle *loghandle)
1020 {
1021         struct llog_ctxt        *ctxt;
1022         struct dt_object        *o, *llog_dir = NULL;
1023         struct dt_device        *d;
1024         struct thandle          *th;
1025         char                    *name = NULL;
1026         int                      rc;
1027
1028         ENTRY;
1029
1030         ctxt = loghandle->lgh_ctxt;
1031         LASSERT(ctxt);
1032
1033         o = loghandle->lgh_obj;
1034         LASSERT(o);
1035
1036         d = lu2dt_dev(o->do_lu.lo_dev);
1037         LASSERT(d);
1038         LASSERT(d == ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt);
1039
1040         th = dt_trans_create(env, d);
1041         if (IS_ERR(th))
1042                 RETURN(PTR_ERR(th));
1043
1044         if (loghandle->lgh_name) {
1045                 llog_dir = llog_osd_dir_get(env, ctxt);
1046                 if (IS_ERR(llog_dir))
1047                         GOTO(out_trans, rc = PTR_ERR(llog_dir));
1048
1049                 name = loghandle->lgh_name;
1050                 rc = dt_declare_delete(env, llog_dir,
1051                                        (struct dt_key *)name, th);
1052                 if (rc)
1053                         GOTO(out_trans, rc);
1054         }
1055
1056         dt_declare_ref_del(env, o, th);
1057
1058         rc = dt_declare_destroy(env, o, th);
1059         if (rc)
1060                 GOTO(out_trans, rc);
1061
1062         rc = dt_trans_start_local(env, d, th);
1063         if (rc)
1064                 GOTO(out_trans, rc);
1065
1066         dt_write_lock(env, o, 0);
1067         if (dt_object_exists(o)) {
1068                 if (name) {
1069                         dt_read_lock(env, llog_dir, 0);
1070                         rc = dt_delete(env, llog_dir,
1071                                        (struct dt_key *) name,
1072                                        th, BYPASS_CAPA);
1073                         dt_read_unlock(env, llog_dir);
1074                         if (rc) {
1075                                 CERROR("%s: can't remove llog %s: rc = %d\n",
1076                                        o->do_lu.lo_dev->ld_obd->obd_name,
1077                                        name, rc);
1078                                 GOTO(out_unlock, rc);
1079                         }
1080                 }
1081                 dt_ref_del(env, o, th);
1082                 rc = dt_destroy(env, o, th);
1083                 if (rc)
1084                         GOTO(out_unlock, rc);
1085         }
1086 out_unlock:
1087         dt_write_unlock(env, o);
1088 out_trans:
1089         dt_trans_stop(env, d, th);
1090         if (llog_dir != NULL)
1091                 lu_object_put(env, &llog_dir->do_lu);
1092         RETURN(rc);
1093 }
1094
1095 static int llog_osd_setup(const struct lu_env *env, struct obd_device *obd,
1096                           struct obd_llog_group *olg, int ctxt_idx,
1097                           struct obd_device *disk_obd)
1098 {
1099         struct llog_thread_info         *lgi = llog_info(env);
1100         struct llog_ctxt                *ctxt;
1101         int                              rc = 0;
1102         ENTRY;
1103
1104         LASSERT(obd);
1105         LASSERT(olg->olg_ctxts[ctxt_idx]);
1106
1107         ctxt = llog_ctxt_get(olg->olg_ctxts[ctxt_idx]);
1108         LASSERT(ctxt);
1109
1110         /* initialize data allowing to generate new fids,
1111          * literally we need a sequece */
1112         lgi->lgi_fid.f_seq = FID_SEQ_LLOG;
1113         lgi->lgi_fid.f_oid = 1;
1114         lgi->lgi_fid.f_ver = 0;
1115         rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1116                                     &lgi->lgi_fid,
1117                                     &ctxt->loc_los_nameless);
1118         if (rc != 0)
1119                 GOTO(out, rc);
1120
1121         lgi->lgi_fid.f_seq = FID_SEQ_LLOG_NAME;
1122         lgi->lgi_fid.f_oid = 1;
1123         lgi->lgi_fid.f_ver = 0;
1124         rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1125                                     &lgi->lgi_fid,
1126                                     &ctxt->loc_los_named);
1127         if (rc != 0) {
1128                 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1129                 ctxt->loc_los_nameless = NULL;
1130         }
1131
1132         GOTO(out, rc);
1133
1134 out:
1135         llog_ctxt_put(ctxt);
1136         return rc;
1137 }
1138
1139 static int llog_osd_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
1140 {
1141         if (ctxt->loc_los_nameless != NULL) {
1142                 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1143                 ctxt->loc_los_nameless = NULL;
1144         }
1145
1146         if (ctxt->loc_los_named != NULL) {
1147                 local_oid_storage_fini(env, ctxt->loc_los_named);
1148                 ctxt->loc_los_named = NULL;
1149         }
1150
1151         return 0;
1152 }
1153
1154 struct llog_operations llog_osd_ops = {
1155         .lop_next_block         = llog_osd_next_block,
1156         .lop_prev_block         = llog_osd_prev_block,
1157         .lop_read_header        = llog_osd_read_header,
1158         .lop_destroy            = llog_osd_destroy,
1159         .lop_setup              = llog_osd_setup,
1160         .lop_cleanup            = llog_osd_cleanup,
1161         .lop_open               = llog_osd_open,
1162         .lop_exist              = llog_osd_exist,
1163         .lop_declare_create     = llog_osd_declare_create,
1164         .lop_create             = llog_osd_create,
1165         .lop_declare_write_rec  = llog_osd_declare_write_rec,
1166         .lop_write_rec          = llog_osd_write_rec,
1167         .lop_close              = llog_osd_close,
1168 };
1169 EXPORT_SYMBOL(llog_osd_ops);
1170
1171 /* reads the catalog list */
1172 int llog_osd_get_cat_list(const struct lu_env *env, struct dt_device *d,
1173                           int idx, int count, struct llog_catid *idarray,
1174                           const struct lu_fid *fid)
1175 {
1176         struct llog_thread_info *lgi = llog_info(env);
1177         struct dt_object        *o = NULL;
1178         struct thandle          *th;
1179         int                      rc, size;
1180
1181         ENTRY;
1182
1183         LASSERT(d);
1184
1185         size = sizeof(*idarray) * count;
1186         lgi->lgi_off = idx *  sizeof(*idarray);
1187
1188         lgi->lgi_fid = *fid;
1189         o = dt_locate(env, d, &lgi->lgi_fid);
1190         if (IS_ERR(o))
1191                 RETURN(PTR_ERR(o));
1192
1193         if (!dt_object_exists(o)) {
1194                 th = dt_trans_create(env, d);
1195                 if (IS_ERR(th))
1196                         GOTO(out, rc = PTR_ERR(th));
1197
1198                 lgi->lgi_attr.la_valid = LA_MODE;
1199                 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1200                 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1201
1202                 rc = dt_declare_create(env, o, &lgi->lgi_attr, NULL,
1203                                        &lgi->lgi_dof, th);
1204                 if (rc)
1205                         GOTO(out_trans, rc);
1206
1207                 rc = dt_trans_start_local(env, d, th);
1208                 if (rc)
1209                         GOTO(out_trans, rc);
1210
1211                 dt_write_lock(env, o, 0);
1212                 if (!dt_object_exists(o))
1213                         rc = dt_create(env, o, &lgi->lgi_attr, NULL,
1214                                        &lgi->lgi_dof, th);
1215                 dt_write_unlock(env, o);
1216 out_trans:
1217                 dt_trans_stop(env, d, th);
1218                 if (rc)
1219                         GOTO(out, rc);
1220         }
1221
1222         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
1223         if (rc)
1224                 GOTO(out, rc);
1225
1226         if (!S_ISREG(lgi->lgi_attr.la_mode)) {
1227                 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
1228                        o->do_lu.lo_dev->ld_obd->obd_name,
1229                        lgi->lgi_attr.la_mode);
1230                 GOTO(out, rc = -ENOENT);
1231         }
1232
1233         CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
1234                (int)lgi->lgi_attr.la_size, size);
1235
1236         /* return just number of llogs */
1237         if (idarray == NULL) {
1238                 rc = lgi->lgi_attr.la_size / sizeof(*idarray);
1239                 GOTO(out, rc);
1240         }
1241
1242         /* read for new ost index or for empty file */
1243         memset(idarray, 0, size);
1244         if (lgi->lgi_attr.la_size < lgi->lgi_off + size)
1245                 GOTO(out, rc = 0);
1246         if (lgi->lgi_attr.la_size < lgi->lgi_off + size)
1247                 size = lgi->lgi_attr.la_size - lgi->lgi_off;
1248
1249         lgi->lgi_buf.lb_buf = idarray;
1250         lgi->lgi_buf.lb_len = size;
1251         rc = dt_record_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
1252         if (rc) {
1253                 CERROR("%s: error reading CATALOGS: rc = %d\n",
1254                        o->do_lu.lo_dev->ld_obd->obd_name,  rc);
1255                 GOTO(out, rc);
1256         }
1257
1258         EXIT;
1259 out:
1260         lu_object_put(env, &o->do_lu);
1261         RETURN(rc);
1262 }
1263 EXPORT_SYMBOL(llog_osd_get_cat_list);
1264
1265 /* writes the cat list */
1266 int llog_osd_put_cat_list(const struct lu_env *env, struct dt_device *d,
1267                           int idx, int count, struct llog_catid *idarray,
1268                           const struct lu_fid *fid)
1269 {
1270         struct llog_thread_info *lgi = llog_info(env);
1271         struct dt_object        *o = NULL;
1272         struct thandle          *th;
1273         int                      rc, size;
1274
1275         if (!count)
1276                 RETURN(0);
1277
1278         LASSERT(d);
1279
1280         size = sizeof(*idarray) * count;
1281         lgi->lgi_off = idx * sizeof(*idarray);
1282         lgi->lgi_fid = *fid;
1283
1284         o = dt_locate(env, d, &lgi->lgi_fid);
1285         if (IS_ERR(o))
1286                 RETURN(PTR_ERR(o));
1287
1288         if (!dt_object_exists(o))
1289                 GOTO(out, rc = -ENOENT);
1290
1291         rc = dt_attr_get(env, o, &lgi->lgi_attr, BYPASS_CAPA);
1292         if (rc)
1293                 GOTO(out, rc);
1294
1295         if (!S_ISREG(lgi->lgi_attr.la_mode)) {
1296                 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
1297                        o->do_lu.lo_dev->ld_obd->obd_name,
1298                        lgi->lgi_attr.la_mode);
1299                 GOTO(out, rc = -ENOENT);
1300         }
1301
1302         th = dt_trans_create(env, d);
1303         if (IS_ERR(th))
1304                 GOTO(out, rc = PTR_ERR(th));
1305
1306         lgi->lgi_buf.lb_len = size;
1307         lgi->lgi_buf.lb_buf = idarray;
1308         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, lgi->lgi_off, th);
1309         if (rc)
1310                 GOTO(out, rc);
1311
1312         rc = dt_trans_start_local(env, d, th);
1313         if (rc)
1314                 GOTO(out_trans, rc);
1315
1316         rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
1317         if (rc)
1318                 CDEBUG(D_INODE, "error writeing CATALOGS: rc = %d\n", rc);
1319 out_trans:
1320         dt_trans_stop(env, d, th);
1321 out:
1322         lu_object_put(env, &o->do_lu);
1323         RETURN(rc);
1324 }
1325 EXPORT_SYMBOL(llog_osd_put_cat_list);