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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2014 Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32 /*
  33  * lustre/obdclass/llog_osd.c
  34  *
  35  * Low level llog routines on top of OSD API
  36  *
  37  * This file provides set of methods for llog operations on top of
  38  * dt_device. It contains all supported llog_operations interfaces and
  39  * supplimental functions.
  40  *
  41  * Author: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
  42  * Author: Mikhail Pershin <mike.pershin@intel.com>
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_LOG
  46
  47 #include <obd.h>
  48 #include <obd_class.h>
  49 #include <lustre_fid.h>
  50 #include <dt_object.h>
  51
  52 #include "llog_internal.h"
  53 #include "local_storage.h"
  54
  55 /**
  56  * Implementation of the llog_operations::lop_declare_create
  57  *
  58  * This function is a wrapper over local_storage API function
  59  * local_object_declare_create().
  60  *
  61  * \param[in] env       execution environment
  62  * \param[in] los       local_storage for bottom storage device
  63  * \param[in] o         dt_object to create
  64  * \param[in] th        current transaction handle
  65  *
  66  * \retval              0 on successful declaration of the new object
  67  * \retval              negative error if declaration was failed
  68  */
  69 static int llog_osd_declare_new_object(const struct lu_env *env,
  70                                        struct local_oid_storage *los,
  71                                        struct dt_object *o,
  72                                        struct thandle *th)
  73 {
  74         struct llog_thread_info *lgi = llog_info(env);
  75
  76         lgi->lgi_attr.la_valid = LA_MODE;
  77         lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
  78         lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
  79
  80         return local_object_declare_create(env, los, o, &lgi->lgi_attr,
  81                                            &lgi->lgi_dof, th);
  82 }
  83
  84 /**
  85  * Implementation of the llog_operations::lop_create
  86  *
  87  * This function is a wrapper over local_storage API function
  88  * local_object_create().
  89  *
  90  * \param[in] env       execution environment
  91  * \param[in] los       local_storage for bottom storage device
  92  * \param[in] o         dt_object to create
  93  * \param[in] th        current transaction handle
  94  *
  95  * \retval              0 on successful creation of the new object
  96  * \retval              negative error if creation was failed
  97  */
  98 static int llog_osd_create_new_object(const struct lu_env *env,
  99                                       struct local_oid_storage *los,
 100                                       struct dt_object *o,
 101                                       struct thandle *th)
 102 {
 103         struct llog_thread_info *lgi = llog_info(env);
 104
 105         lgi->lgi_attr.la_valid = LA_MODE;
 106         lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
 107         lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
 108
 109         return local_object_create(env, los, o, &lgi->lgi_attr,
 110                                    &lgi->lgi_dof, th);
 111 }
 112
 113 /**
 114  * Write a padding record to the llog
 115  *
 116  * This function writes a padding record to the end of llog. That may
 117  * be needed if llog contains records of variable size, e.g. config logs
 118  * or changelogs.
 119  * The padding record just aligns llog to the llog chunk_size boundary if
 120  * the current record doesn't fit in the remaining space.
 121  *
 122  * It allocates full length to avoid two separate writes for header and tail.
 123  * Such 2-steps scheme needs extra protection and complex error handling.
 124  *
 125  * \param[in]     env   execution environment
 126  * \param[in]     o     dt_object to create
 127  * \param[in,out] off   pointer to the padding start offset
 128  * \param[in]     len   padding length
 129  * \param[in]     index index of the padding record in a llog
 130  * \param[in]     th    current transaction handle
 131  *
 132  * \retval              0 on successful padding write
 133  * \retval              negative error if write failed
 134  */
 135 static int llog_osd_pad(const struct lu_env *env, struct dt_object *o,
 136                         loff_t *off, int len, int index, struct thandle *th)
 137 {
 138         struct llog_thread_info *lgi = llog_info(env);
 139         struct llog_rec_hdr     *rec;
 140         struct llog_rec_tail    *tail;
 141         int                      rc;
 142
 143         ENTRY;
 144
 145         LASSERT(th);
 146         LASSERT(off);
 147         LASSERT(len >= LLOG_MIN_REC_SIZE && (len & 0x7) == 0);
 148
 149         OBD_ALLOC(rec, len);
 150         if (rec == NULL)
 151                 RETURN(-ENOMEM);
 152
 153         rec->lrh_len = len;
 154         rec->lrh_index = index;
 155         rec->lrh_type = LLOG_PAD_MAGIC;
 156
 157         tail = rec_tail(rec);
 158         tail->lrt_len = len;
 159         tail->lrt_index = index;
 160
 161         lgi->lgi_buf.lb_buf = rec;
 162         lgi->lgi_buf.lb_len = len;
 163         rc = dt_record_write(env, o, &lgi->lgi_buf, off, th);
 164         if (rc)
 165                 CERROR("%s: error writing padding record: rc = %d\n",
 166                        o->do_lu.lo_dev->ld_obd->obd_name, rc);
 167
 168         OBD_FREE(rec, len);
 169         RETURN(rc);
 170 }
 171
 172 /**
 173  * Implementation of the llog_operations::lop_read_header
 174  *
 175  * This function reads the current llog header from the bottom storage
 176  * device.
 177  *
 178  * \param[in] env       execution environment
 179  * \param[in] handle    llog handle of the current llog
 180  *
 181  * \retval              0 on successful header read
 182  * \retval              negative error if read failed
 183  */
 184 static int llog_osd_read_header(const struct lu_env *env,
 185                                 struct llog_handle *handle)
 186 {
 187         struct llog_rec_hdr     *llh_hdr;
 188         struct dt_object        *o;
 189         struct llog_thread_info *lgi;
 190         enum llog_flag           flags;
 191         int                      rc;
 192
 193         ENTRY;
 194
 195         o = handle->lgh_obj;
 196         LASSERT(o);
 197
 198         lgi = llog_info(env);
 199
 200         rc = dt_attr_get(env, o, &lgi->lgi_attr);
 201         if (rc)
 202                 RETURN(rc);
 203
 204         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 205
 206         if (lgi->lgi_attr.la_size == 0) {
 207                 CDEBUG(D_HA, "not reading header from 0-byte log\n");
 208                 RETURN(LLOG_EEMPTY);
 209         }
 210
 211         flags = handle->lgh_hdr->llh_flags;
 212
 213         lgi->lgi_off = 0;
 214         lgi->lgi_buf.lb_buf = handle->lgh_hdr;
 215         lgi->lgi_buf.lb_len = handle->lgh_hdr_size;
 216         rc = dt_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
 217         llh_hdr = &handle->lgh_hdr->llh_hdr;
 218         if (rc < sizeof(*llh_hdr) || rc < llh_hdr->lrh_len) {
 219                 CERROR("%s: error reading "DFID" log header size %d: rc = %d\n",
 220                        o->do_lu.lo_dev->ld_obd->obd_name,
 221                        PFID(lu_object_fid(&o->do_lu)), rc < 0 ? 0 : rc,
 222                        -EFAULT);
 223
 224                 if (rc >= 0)
 225                         rc = -EFAULT;
 226
 227                 RETURN(rc);
 228         }
 229
 230         if (LLOG_REC_HDR_NEEDS_SWABBING(llh_hdr))
 231                 lustre_swab_llog_hdr(handle->lgh_hdr);
 232
 233         if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 234                 CERROR("%s: bad log %s "DFID" header magic: %#x "
 235                        "(expected %#x)\n", o->do_lu.lo_dev->ld_obd->obd_name,
 236                        handle->lgh_name ? handle->lgh_name : "",
 237                        PFID(lu_object_fid(&o->do_lu)),
 238                        llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 239                 RETURN(-EIO);
 240         } else if (llh_hdr->lrh_len < LLOG_MIN_CHUNK_SIZE ||
 241                    llh_hdr->lrh_len > handle->lgh_hdr_size) {
 242                 CERROR("%s: incorrectly sized log %s "DFID" header: "
 243                        "%#x (expected at least %#x)\n"
 244                        "you may need to re-run lconf --write_conf.\n",
 245                        o->do_lu.lo_dev->ld_obd->obd_name,
 246                        handle->lgh_name ? handle->lgh_name : "",
 247                        PFID(lu_object_fid(&o->do_lu)),
 248                        llh_hdr->lrh_len, LLOG_MIN_CHUNK_SIZE);
 249                 RETURN(-EIO);
 250         } else if (LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_index >
 251                    LLOG_HDR_BITMAP_SIZE(handle->lgh_hdr) ||
 252                    LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_len !=
 253                         llh_hdr->lrh_len) {
 254                 CERROR("%s: incorrectly sized log %s "DFID" tailer: "
 255                        "%#x : rc = %d\n",
 256                        o->do_lu.lo_dev->ld_obd->obd_name,
 257                        handle->lgh_name ? handle->lgh_name : "",
 258                        PFID(lu_object_fid(&o->do_lu)),
 259                        LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_len, -EIO);
 260                 RETURN(-EIO);
 261         }
 262
 263         handle->lgh_hdr->llh_flags |= (flags & LLOG_F_EXT_MASK);
 264         handle->lgh_last_idx = LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_index;
 265
 266         RETURN(0);
 267 }
 268
 269 /**
 270  * Implementation of the llog_operations::lop_declare_write
 271  *
 272  * This function declares the new record write.
 273  *
 274  * \param[in] env       execution environment
 275  * \param[in] loghandle llog handle of the current llog
 276  * \param[in] rec       llog record header. This is a real header of the full
 277  *                      llog record to write. This is the beginning of buffer
 278  *                      to write, the length of buffer is stored in
 279  *                      \a rec::lrh_len
 280  * \param[in] idx       index of the llog record. If \a idx == -1 then this is
 281  *                      append case, otherwise \a idx is the index of record
 282  *                      to modify
 283  * \param[in] th        current transaction handle
 284  *
 285  * \retval              0 on successful declaration
 286  * \retval              negative error if declaration failed
 287  */
 288 static int llog_osd_declare_write_rec(const struct lu_env *env,
 289                                       struct llog_handle *loghandle,
 290                                       struct llog_rec_hdr *rec,
 291                                       int idx, struct thandle *th)
 292 {
 293         struct llog_thread_info *lgi = llog_info(env);
 294         __u32                   chunk_size;
 295         struct dt_object        *o;
 296         int                      rc;
 297
 298         ENTRY;
 299
 300         LASSERT(env);
 301         LASSERT(th);
 302         LASSERT(loghandle);
 303         LASSERT(rec);
 304         LASSERT(rec->lrh_len <= loghandle->lgh_ctxt->loc_chunk_size);
 305
 306         o = loghandle->lgh_obj;
 307         LASSERT(o);
 308
 309         chunk_size = loghandle->lgh_ctxt->loc_chunk_size;
 310         lgi->lgi_buf.lb_len = chunk_size;
 311         lgi->lgi_buf.lb_buf = NULL;
 312         /* each time we update header */
 313         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, 0,
 314                                      th);
 315         if (rc || idx == 0) /* if error or just header */
 316                 RETURN(rc);
 317
 318         /**
 319          * the pad record can be inserted so take into account double
 320          * record size
 321          */
 322         lgi->lgi_buf.lb_len = chunk_size * 2;
 323         lgi->lgi_buf.lb_buf = NULL;
 324         /* XXX: implement declared window or multi-chunks approach */
 325         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, -1, th);
 326
 327         RETURN(rc);
 328 }
 329
 330 /**
 331  * Implementation of the llog_operations::lop_write
 332  *
 333  * This function writes the new record in the llog or modify the existed one.
 334  *
 335  * \param[in]  env              execution environment
 336  * \param[in]  loghandle        llog handle of the current llog
 337  * \param[in]  rec              llog record header. This is a real header of
 338  *                              the full llog record to write. This is
 339  *                              the beginning of buffer to write, the length
 340  *                              of buffer is stored in \a rec::lrh_len
 341  * \param[out] reccookie        pointer to the cookie to return back if needed.
 342  *                              It is used for further cancel of this llog
 343  *                              record.
 344  * \param[in]  idx              index of the llog record. If \a idx == -1 then
 345  *                              this is append case, otherwise \a idx is
 346  *                              the index of record to modify
 347  * \param[in]  th               current transaction handle
 348  *
 349  * \retval                      0 on successful write && \a reccookie == NULL
 350  *                              1 on successful write && \a reccookie != NULL
 351  * \retval                      negative error if write failed
 352  */
 353 static int llog_osd_write_rec(const struct lu_env *env,
 354                               struct llog_handle *loghandle,
 355                               struct llog_rec_hdr *rec,
 356                               struct llog_cookie *reccookie,
 357                               int idx, struct thandle *th)
 358 {
 359         struct llog_thread_info *lgi = llog_info(env);
 360         struct llog_log_hdr     *llh;
 361         int                      reclen = rec->lrh_len;
 362         int                      index, rc;
 363         struct llog_rec_tail    *lrt;
 364         struct dt_object        *o;
 365         __u32                   chunk_size;
 366         size_t                   left;
 367
 368         ENTRY;
 369
 370         LASSERT(env);
 371         llh = loghandle->lgh_hdr;
 372         LASSERT(llh);
 373         o = loghandle->lgh_obj;
 374         LASSERT(o);
 375         LASSERT(th);
 376
 377         chunk_size = llh->llh_hdr.lrh_len;
 378         CDEBUG(D_OTHER, "new record %x to "DFID"\n",
 379                rec->lrh_type, PFID(lu_object_fid(&o->do_lu)));
 380
 381         /* record length should not bigger than  */
 382         if (reclen > loghandle->lgh_hdr->llh_hdr.lrh_len)
 383                 RETURN(-E2BIG);
 384
 385         rc = dt_attr_get(env, o, &lgi->lgi_attr);
 386         if (rc)
 387                 RETURN(rc);
 388
 389         /**
 390          * The modification case.
 391          * If idx set then the record with that index must be modified.
 392          * There are three cases possible:
 393          * 1) the common case is the llog header update (idx == 0)
 394          * 2) the llog record modification during llog process.
 395          *    This is indicated by the \a loghandle::lgh_cur_idx > 0.
 396          *    In that case the \a loghandle::lgh_cur_offset
 397          * 3) otherwise this is assumed that llog consist of records of
 398          *    fixed size, i.e. catalog. The llog header must has llh_size
 399          *    field equal to record size. The record offset is calculated
 400          *    just by /a idx value
 401          *
 402          * During modification we don't need extra header update because
 403          * the bitmap and record count are not changed. The record header
 404          * and tail remains the same too.
 405          */
 406         if (idx != LLOG_NEXT_IDX) {
 407                 /* llog can be empty only when first record is being written */
 408                 LASSERT(ergo(idx > 0, lgi->lgi_attr.la_size > 0));
 409
 410                 if (!ext2_test_bit(idx, LLOG_HDR_BITMAP(llh))) {
 411                         CERROR("%s: modify unset record %u\n",
 412                                o->do_lu.lo_dev->ld_obd->obd_name, idx);
 413                         RETURN(-ENOENT);
 414                 }
 415
 416                 if (idx != rec->lrh_index) {
 417                         CERROR("%s: modify index mismatch %d %u\n",
 418                                o->do_lu.lo_dev->ld_obd->obd_name, idx,
 419                                rec->lrh_index);
 420                         RETURN(-EFAULT);
 421                 }
 422
 423                 if (idx == LLOG_HEADER_IDX) {
 424                         /* llog header update */
 425                         __u32   *bitmap = LLOG_HDR_BITMAP(llh);
 426
 427                         lgi->lgi_off = 0;
 428
 429                         /* If it does not indicate the bitmap index
 430                          * (reccookie == NULL), then it means update
 431                          * the whole update header. Otherwise only
 432                          * update header and bits needs to be updated,
 433                          * and in DNE cases, it will signaficantly
 434                          * shrink the RPC size.
 435                          * see distribute_txn_cancel_records()*/
 436                         if (reccookie == NULL) {
 437                                 lgi->lgi_buf.lb_len = reclen;
 438                                 lgi->lgi_buf.lb_buf = rec;
 439                                 rc = dt_record_write(env, o, &lgi->lgi_buf,
 440                                                      &lgi->lgi_off, th);
 441                                 RETURN(rc);
 442                         }
 443
 444                         /* update the header */
 445                         lgi->lgi_buf.lb_len = llh->llh_bitmap_offset;
 446                         lgi->lgi_buf.lb_buf = llh;
 447                         rc = dt_record_write(env, o, &lgi->lgi_buf,
 448                                              &lgi->lgi_off, th);
 449                         if (rc != 0)
 450                                 RETURN(rc);
 451
 452                         /* update the bitmap */
 453                         index = reccookie->lgc_index;
 454                         lgi->lgi_off = llh->llh_bitmap_offset +
 455                                       (index / (sizeof(*bitmap) * 8)) *
 456                                                         sizeof(*bitmap);
 457                         lgi->lgi_buf.lb_len = sizeof(*bitmap);
 458                         lgi->lgi_buf.lb_buf =
 459                                         &bitmap[index/(sizeof(*bitmap)*8)];
 460                         rc = dt_record_write(env, o, &lgi->lgi_buf,
 461                                              &lgi->lgi_off, th);
 462
 463                         RETURN(rc);
 464                 } else if (loghandle->lgh_cur_idx > 0) {
 465                         /**
 466                          * The lgh_cur_offset can be used only if index is
 467                          * the same.
 468                          */
 469                         if (idx != loghandle->lgh_cur_idx) {
 470                                 CERROR("%s: modify index mismatch %d %d\n",
 471                                        o->do_lu.lo_dev->ld_obd->obd_name, idx,
 472                                        loghandle->lgh_cur_idx);
 473                                 RETURN(-EFAULT);
 474                         }
 475
 476                         lgi->lgi_off = loghandle->lgh_cur_offset;
 477                         CDEBUG(D_OTHER, "modify record "DOSTID": idx:%d, "
 478                                "len:%u offset %llu\n",
 479                                POSTID(&loghandle->lgh_id.lgl_oi), idx,
 480                                rec->lrh_len, (long long)lgi->lgi_off);
 481                 } else if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
 482                         if (llh->llh_size == 0 ||
 483                             llh->llh_size != rec->lrh_len) {
 484                                 CERROR("%s: wrong record size, llh_size is %u"
 485                                        " but record size is %u\n",
 486                                        o->do_lu.lo_dev->ld_obd->obd_name,
 487                                        llh->llh_size, rec->lrh_len);
 488                                 RETURN(-EINVAL);
 489                         }
 490                         lgi->lgi_off = sizeof(*llh) + (idx - 1) * reclen;
 491                 } else {
 492                         /* This can be result of lgh_cur_idx is not set during
 493                          * llog processing or llh_size is not set to proper
 494                          * record size for fixed records llog. Therefore it is
 495                          * impossible to get record offset. */
 496                         CERROR("%s: can't get record offset, idx:%d, "
 497                                "len:%u.\n", o->do_lu.lo_dev->ld_obd->obd_name,
 498                                idx, rec->lrh_len);
 499                         RETURN(-EFAULT);
 500                 }
 501
 502                 /* update only data, header and tail remain the same */
 503                 lgi->lgi_off += sizeof(struct llog_rec_hdr);
 504                 lgi->lgi_buf.lb_len = REC_DATA_LEN(rec);
 505                 lgi->lgi_buf.lb_buf = REC_DATA(rec);
 506                 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
 507                 if (rc == 0 && reccookie) {
 508                         reccookie->lgc_lgl = loghandle->lgh_id;
 509                         reccookie->lgc_index = idx;
 510                         rc = 1;
 511                 }
 512                 RETURN(rc);
 513         }
 514
 515         /**
 516          * The append case.
 517          * The most common case of using llog. The new index is assigned to
 518          * the new record, new bit is set in llog bitmap and llog count is
 519          * incremented.
 520          *
 521          * Make sure that records don't cross a chunk boundary, so we can
 522          * process them page-at-a-time if needed.  If it will cross a chunk
 523          * boundary, write in a fake (but referenced) entry to pad the chunk.
 524          */
 525         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 526         lgi->lgi_off = lgi->lgi_attr.la_size;
 527         left = chunk_size - (lgi->lgi_off & (chunk_size - 1));
 528         /* NOTE: padding is a record, but no bit is set */
 529         if (left != 0 && left != reclen &&
 530             left < (reclen + LLOG_MIN_REC_SIZE)) {
 531                 index = loghandle->lgh_last_idx + 1;
 532                 rc = llog_osd_pad(env, o, &lgi->lgi_off, left, index, th);
 533                 if (rc)
 534                         RETURN(rc);
 535                 loghandle->lgh_last_idx++; /* for pad rec */
 536         }
 537         /* if it's the last idx in log file, then return -ENOSPC */
 538         if (loghandle->lgh_last_idx >= LLOG_HDR_BITMAP_SIZE(llh) - 1)
 539                 RETURN(-ENOSPC);
 540
 541         /* increment the last_idx along with llh_tail index, they should
 542          * be equal for a llog lifetime */
 543         loghandle->lgh_last_idx++;
 544         index = loghandle->lgh_last_idx;
 545         LLOG_HDR_TAIL(llh)->lrt_index = index;
 546         /**
 547          * NB: the caller should make sure only 1 process access
 548          * the lgh_last_idx, e.g. append should be exclusive.
 549          * Otherwise it might hit the assert.
 550          */
 551         LASSERT(index < LLOG_HDR_BITMAP_SIZE(llh));
 552         rec->lrh_index = index;
 553         lrt = rec_tail(rec);
 554         lrt->lrt_len = rec->lrh_len;
 555         lrt->lrt_index = rec->lrh_index;
 556
 557         /* the lgh_hdr_mutex protects llog header data from concurrent
 558          * update/cancel, the llh_count and llh_bitmap are protected */
 559         mutex_lock(&loghandle->lgh_hdr_mutex);
 560         if (ext2_set_bit(index, LLOG_HDR_BITMAP(llh))) {
 561                 CERROR("%s: index %u already set in log bitmap\n",
 562                        o->do_lu.lo_dev->ld_obd->obd_name, index);
 563                 mutex_unlock(&loghandle->lgh_hdr_mutex);
 564                 LBUG(); /* should never happen */
 565         }
 566         llh->llh_count++;
 567
 568         if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
 569                 LASSERT(llh->llh_size == reclen);
 570         } else {
 571                 /* Update the minimum size of the llog record */
 572                 if (llh->llh_size == 0)
 573                         llh->llh_size = reclen;
 574                 else if (reclen < llh->llh_size)
 575                         llh->llh_size = reclen;
 576         }
 577
 578         if (lgi->lgi_attr.la_size == 0) {
 579                 lgi->lgi_off = 0;
 580                 lgi->lgi_buf.lb_len = llh->llh_hdr.lrh_len;
 581                 lgi->lgi_buf.lb_buf = &llh->llh_hdr;
 582                 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
 583                 if (rc != 0)
 584                         GOTO(out_unlock, rc);
 585         } else {
 586                 __u32   *bitmap = LLOG_HDR_BITMAP(llh);
 587
 588                 /* Note: If this is not initialization (size == 0), then do not
 589                  * write the whole header (8k bytes), only update header/tail
 590                  * and bits needs to be updated. Because this update might be
 591                  * part of cross-MDT operation, which needs to write these
 592                  * updates into the update log(32KB limit) and also pack inside
 593                  * the RPC (1MB limit), if we write 8K for each operation, which
 594                  * will cost a lot space, and keep us adding more updates to one
 595                  * update log.*/
 596                 lgi->lgi_off = 0;
 597                 lgi->lgi_buf.lb_len = llh->llh_bitmap_offset;
 598                 lgi->lgi_buf.lb_buf = &llh->llh_hdr;
 599                 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
 600                 if (rc != 0)
 601                         GOTO(out_unlock, rc);
 602
 603                 lgi->lgi_off = llh->llh_bitmap_offset +
 604                               (index / (sizeof(*bitmap) * 8)) * sizeof(*bitmap);
 605                 lgi->lgi_buf.lb_len = sizeof(*bitmap);
 606                 lgi->lgi_buf.lb_buf = &bitmap[index/(sizeof(*bitmap)*8)];
 607                 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
 608                 if (rc != 0)
 609                         GOTO(out_unlock, rc);
 610
 611                 lgi->lgi_off =  (unsigned long)LLOG_HDR_TAIL(llh) -
 612                                 (unsigned long)llh;
 613                 lgi->lgi_buf.lb_len = sizeof(llh->llh_tail);
 614                 lgi->lgi_buf.lb_buf = LLOG_HDR_TAIL(llh);
 615                 rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
 616                 if (rc != 0)
 617                         GOTO(out_unlock, rc);
 618         }
 619
 620 out_unlock:
 621         /* unlock here for remote object */
 622         mutex_unlock(&loghandle->lgh_hdr_mutex);
 623         if (rc)
 624                 GOTO(out, rc);
 625
 626         rc = dt_attr_get(env, o, &lgi->lgi_attr);
 627         if (rc)
 628                 GOTO(out, rc);
 629
 630         LASSERT(lgi->lgi_attr.la_valid & LA_SIZE);
 631         lgi->lgi_off = max_t(__u64, lgi->lgi_attr.la_size, lgi->lgi_off);
 632         lgi->lgi_buf.lb_len = reclen;
 633         lgi->lgi_buf.lb_buf = rec;
 634         rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
 635         if (rc < 0)
 636                 GOTO(out, rc);
 637
 638         CDEBUG(D_OTHER, "added record "DOSTID": idx: %u, %u off"LPU64"\n",
 639                POSTID(&loghandle->lgh_id.lgl_oi), index, rec->lrh_len,
 640                lgi->lgi_off);
 641         if (reccookie != NULL) {
 642                 reccookie->lgc_lgl = loghandle->lgh_id;
 643                 reccookie->lgc_index = index;
 644                 if ((rec->lrh_type == MDS_UNLINK_REC) ||
 645                     (rec->lrh_type == MDS_SETATTR64_REC))
 646                         reccookie->lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
 647                 else if (rec->lrh_type == OST_SZ_REC)
 648                         reccookie->lgc_subsys = LLOG_SIZE_ORIG_CTXT;
 649                 else
 650                         reccookie->lgc_subsys = -1;
 651                 rc = 1;
 652         }
 653         RETURN(rc);
 654 out:
 655         /* cleanup llog for error case */
 656         mutex_lock(&loghandle->lgh_hdr_mutex);
 657         ext2_clear_bit(index, LLOG_HDR_BITMAP(llh));
 658         llh->llh_count--;
 659         mutex_unlock(&loghandle->lgh_hdr_mutex);
 660
 661         /* restore llog last_idx */
 662         loghandle->lgh_last_idx--;
 663         LLOG_HDR_TAIL(llh)->lrt_index = loghandle->lgh_last_idx;
 664
 665         RETURN(rc);
 666 }
 667
 668 /**
 669  * We can skip reading at least as many log blocks as the number of
 670  * minimum sized log records we are skipping.  If it turns out
 671  * that we are not far enough along the log (because the
 672  * actual records are larger than minimum size) we just skip
 673  * some more records.
 674  *
 675  * Note: in llog_process_thread, it will use bitmap offset as
 676  * the index to locate the record, which also includs some pad
 677  * records, whose record size is very small, and it also does not
 678  * consider pad record when recording minimum record size (otherwise
 679  * min_record size might be too small), so in some rare cases,
 680  * it might skip too much record for @goal, see llog_osd_next_block().
 681  *
 682  * When force_mini_rec is true, it means we have to use LLOG_MIN_REC_SIZE
 683  * as the min record size to skip over, usually because in the previous
 684  * try, it skip too much record, see loog_osd_next(prev)_block().
 685  */
 686 static inline void llog_skip_over(struct llog_handle *lgh, __u64 *off,
 687                                   int curr, int goal, __u32 chunk_size,
 688                                   bool force_mini_rec)
 689 {
 690         struct llog_log_hdr *llh = lgh->lgh_hdr;
 691
 692         /* Goal should not bigger than the record count */
 693         if (goal > lgh->lgh_last_idx)
 694                 goal = lgh->lgh_last_idx;
 695
 696         if (goal > curr) {
 697                 if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
 698                         *off = chunk_size + (goal - 1) * llh->llh_size;
 699                 } else {
 700                         __u64 min_rec_size = LLOG_MIN_REC_SIZE;
 701
 702                         if (llh->llh_size > 0 && !force_mini_rec)
 703                                 min_rec_size = llh->llh_size;
 704
 705                         *off = *off + (goal - curr - 1) * min_rec_size;
 706                 }
 707         }
 708         /* always align with lower chunk boundary*/
 709         *off &= ~(chunk_size - 1);
 710 }
 711
 712 /**
 713  * Remove optional fields that the client doesn't expect.
 714  * This is typically in order to ensure compatibility with older clients.
 715  * It is assumed that since we exclusively remove fields, the block will be
 716  * big enough to handle the remapped records. It is also assumed that records
 717  * of a block have the same format (i.e.: the same features enabled).
 718  *
 719  * \param[in,out]    hdr        Header of the block of records to remap.
 720  * \param[in,out]    last_hdr   Last header, don't read past this point.
 721  * \param[in]        flags      Flags describing the fields to keep.
 722  */
 723 static void changelog_block_trim_ext(struct llog_rec_hdr *hdr,
 724                                      struct llog_rec_hdr *last_hdr,
 725                                      enum changelog_rec_flags flags)
 726 {
 727         if (hdr->lrh_type != CHANGELOG_REC)
 728                 return;
 729
 730         do {
 731                 struct changelog_rec *rec = (struct changelog_rec *)(hdr + 1);
 732
 733                 changelog_remap_rec(rec, rec->cr_flags & flags);
 734                 hdr = llog_rec_hdr_next(hdr);
 735         } while ((char *)hdr <= (char *)last_hdr);
 736 }
 737
 738 /**
 739  * Implementation of the llog_operations::lop_next_block
 740  *
 741  * This function finds the the next llog block to return which contains
 742  * record with required index. It is main part of llog processing.
 743  *
 744  * \param[in]     env           execution environment
 745  * \param[in]     loghandle     llog handle of the current llog
 746  * \param[in,out] cur_idx       index preceeding cur_offset
 747  * \param[in]     next_idx      target index to find
 748  * \param[in,out] cur_offset    furtherst point read in the file
 749  * \param[in]     buf           pointer to data buffer to fill
 750  * \param[in]     len           required len to read, it is
 751  *                              usually llog chunk_size.
 752  *
 753  * \retval                      0 on successful buffer read
 754  * \retval                      negative value on error
 755  */
 756 static int llog_osd_next_block(const struct lu_env *env,
 757                                struct llog_handle *loghandle, int *cur_idx,
 758                                int next_idx, __u64 *cur_offset, void *buf,
 759                                int len)
 760 {
 761         struct llog_thread_info *lgi = llog_info(env);
 762         struct dt_object        *o;
 763         struct dt_device        *dt;
 764         int                      rc;
 765         __u32                   chunk_size;
 766         int last_idx = *cur_idx;
 767         __u64 last_offset = *cur_offset;
 768         bool force_mini_rec = false;
 769
 770         ENTRY;
 771
 772         LASSERT(env);
 773         LASSERT(lgi);
 774
 775         chunk_size = loghandle->lgh_hdr->llh_hdr.lrh_len;
 776         if (len == 0 || len & (chunk_size - 1))
 777                 RETURN(-EINVAL);
 778
 779         CDEBUG(D_OTHER, "looking for log index %u (cur idx %u off "LPU64")\n",
 780                next_idx, *cur_idx, *cur_offset);
 781
 782         LASSERT(loghandle);
 783         LASSERT(loghandle->lgh_ctxt);
 784
 785         o = loghandle->lgh_obj;
 786         LASSERT(o);
 787         LASSERT(dt_object_exists(o));
 788         dt = lu2dt_dev(o->do_lu.lo_dev);
 789         LASSERT(dt);
 790
 791         rc = dt_attr_get(env, o, &lgi->lgi_attr);
 792         if (rc)
 793                 GOTO(out, rc);
 794
 795         while (*cur_offset < lgi->lgi_attr.la_size) {
 796                 struct llog_rec_hdr     *rec, *last_rec;
 797                 struct llog_rec_tail    *tail;
 798
 799                 llog_skip_over(loghandle, cur_offset, *cur_idx,
 800                                next_idx, chunk_size, force_mini_rec);
 801
 802                 /* read up to next llog chunk_size block */
 803                 lgi->lgi_buf.lb_len = chunk_size -
 804                                       (*cur_offset & (chunk_size - 1));
 805                 lgi->lgi_buf.lb_buf = buf;
 806
 807                 rc = dt_read(env, o, &lgi->lgi_buf, cur_offset);
 808                 if (rc < 0) {
 809                         if (rc == -EBADR && !force_mini_rec)
 810                                 goto retry;
 811
 812                         CERROR("%s: can't read llog block from log "DFID
 813                                " offset "LPU64": rc = %d\n",
 814                                o->do_lu.lo_dev->ld_obd->obd_name,
 815                                PFID(lu_object_fid(&o->do_lu)), *cur_offset,
 816                                rc);
 817                         GOTO(out, rc);
 818                 }
 819
 820                 if (rc < len) {
 821                         /* signal the end of the valid buffer to
 822                          * llog_process */
 823                         memset(buf + rc, 0, len - rc);
 824                 }
 825
 826                 if (rc == 0) { /* end of file, nothing to do */
 827                         if (!force_mini_rec)
 828                                 goto retry;
 829                         GOTO(out, rc);
 830                 }
 831
 832                 if (rc < sizeof(*tail)) {
 833                         if (!force_mini_rec)
 834                                 goto retry;
 835
 836                         CERROR("%s: invalid llog block at log id "DOSTID"/%u "
 837                                "offset "LPU64"\n",
 838                                o->do_lu.lo_dev->ld_obd->obd_name,
 839                                POSTID(&loghandle->lgh_id.lgl_oi),
 840                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 841                         GOTO(out, rc = -EINVAL);
 842                 }
 843
 844                 rec = buf;
 845                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 846                         lustre_swab_llog_rec(rec);
 847
 848                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 849                                                 sizeof(struct llog_rec_tail));
 850                 /* get the last record in block */
 851                 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
 852                                                    tail->lrt_len);
 853
 854                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
 855                         lustre_swab_llog_rec(last_rec);
 856                 LASSERT(last_rec->lrh_index == tail->lrt_index);
 857
 858                 *cur_idx = tail->lrt_index;
 859
 860                 /* this shouldn't happen */
 861                 if (tail->lrt_index == 0) {
 862                         CERROR("%s: invalid llog tail at log id "DOSTID"/%u "
 863                                "offset "LPU64"\n",
 864                                o->do_lu.lo_dev->ld_obd->obd_name,
 865                                POSTID(&loghandle->lgh_id.lgl_oi),
 866                                loghandle->lgh_id.lgl_ogen, *cur_offset);
 867                         GOTO(out, rc = -EINVAL);
 868                 }
 869                 if (tail->lrt_index < next_idx) {
 870                         last_idx = *cur_idx;
 871                         last_offset = *cur_offset;
 872                         continue;
 873                 }
 874
 875                 /* sanity check that the start of the new buffer is no farther
 876                  * than the record that we wanted.  This shouldn't happen. */
 877                 if (rec->lrh_index > next_idx) {
 878                         if (!force_mini_rec && next_idx > last_idx)
 879                                 goto retry;
 880
 881                         CERROR("%s: missed desired record? %u > %u\n",
 882                                o->do_lu.lo_dev->ld_obd->obd_name,
 883                                rec->lrh_index, next_idx);
 884                         GOTO(out, rc = -ENOENT);
 885                 }
 886
 887                 /* Trim unsupported extensions for compat w/ older clients */
 888                 if (!(loghandle->lgh_hdr->llh_flags & LLOG_F_EXT_JOBID))
 889                         changelog_block_trim_ext(rec, last_rec,
 890                                                  CLF_VERSION | CLF_RENAME);
 891
 892                 GOTO(out, rc = 0);
 893
 894 retry:
 895                 /* Note: because there are some pad records in the
 896                  * llog, so llog_skip_over() might skip too much
 897                  * records, let's try skip again with minimum record */
 898                 force_mini_rec = true;
 899                 *cur_offset = last_offset;
 900                 *cur_idx = last_idx;
 901         }
 902         GOTO(out, rc = -EIO);
 903 out:
 904         return rc;
 905 }
 906
 907 /**
 908  * Implementation of the llog_operations::lop_prev_block
 909  *
 910  * This function finds the llog block to return which contains
 911  * record with required index but in reverse order - from end of llog
 912  * to the beginning.
 913  * It is main part of reverse llog processing.
 914  *
 915  * \param[in] env       execution environment
 916  * \param[in] loghandle llog handle of the current llog
 917  * \param[in] prev_idx  target index to find
 918  * \param[in] buf       pointer to data buffer to fill
 919  * \param[in] len       required len to read, it is llog_chunk_size usually.
 920  *
 921  * \retval              0 on successful buffer read
 922  * \retval              negative value on error
 923  */
 924 static int llog_osd_prev_block(const struct lu_env *env,
 925                                struct llog_handle *loghandle,
 926                                int prev_idx, void *buf, int len)
 927 {
 928         struct llog_thread_info *lgi = llog_info(env);
 929         struct dt_object        *o;
 930         struct dt_device        *dt;
 931         loff_t                   cur_offset;
 932         __u32                   chunk_size;
 933         int                      rc;
 934
 935         ENTRY;
 936
 937         chunk_size = loghandle->lgh_hdr->llh_hdr.lrh_len;
 938         if (len == 0 || len & (chunk_size - 1))
 939                 RETURN(-EINVAL);
 940
 941         CDEBUG(D_OTHER, "looking for log index %u\n", prev_idx);
 942
 943         LASSERT(loghandle);
 944         LASSERT(loghandle->lgh_ctxt);
 945
 946         o = loghandle->lgh_obj;
 947         LASSERT(o);
 948         LASSERT(dt_object_exists(o));
 949         dt = lu2dt_dev(o->do_lu.lo_dev);
 950         LASSERT(dt);
 951
 952         /* Let's only use mini record size for previous block read
 953          * for now XXX */
 954         cur_offset = chunk_size;
 955         llog_skip_over(loghandle, &cur_offset, 0, prev_idx,
 956                        chunk_size, true);
 957
 958         rc = dt_attr_get(env, o, &lgi->lgi_attr);
 959         if (rc)
 960                 GOTO(out, rc);
 961
 962         while (cur_offset < lgi->lgi_attr.la_size) {
 963                 struct llog_rec_hdr     *rec, *last_rec;
 964                 struct llog_rec_tail    *tail;
 965
 966                 lgi->lgi_buf.lb_len = len;
 967                 lgi->lgi_buf.lb_buf = buf;
 968                 rc = dt_read(env, o, &lgi->lgi_buf, &cur_offset);
 969                 if (rc < 0) {
 970                         CERROR("%s: can't read llog block from log "DFID
 971                                " offset "LPU64": rc = %d\n",
 972                                o->do_lu.lo_dev->ld_obd->obd_name,
 973                                PFID(lu_object_fid(&o->do_lu)), cur_offset, rc);
 974                         GOTO(out, rc);
 975                 }
 976
 977                 if (rc == 0) /* end of file, nothing to do */
 978                         GOTO(out, rc);
 979
 980                 if (rc < sizeof(*tail)) {
 981                         CERROR("%s: invalid llog block at log id "DOSTID"/%u "
 982                                "offset "LPU64"\n",
 983                                o->do_lu.lo_dev->ld_obd->obd_name,
 984                                POSTID(&loghandle->lgh_id.lgl_oi),
 985                                loghandle->lgh_id.lgl_ogen, cur_offset);
 986                         GOTO(out, rc = -EINVAL);
 987                 }
 988
 989                 rec = buf;
 990                 if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
 991                         lustre_swab_llog_rec(rec);
 992
 993                 tail = (struct llog_rec_tail *)((char *)buf + rc -
 994                                                 sizeof(struct llog_rec_tail));
 995                 /* get the last record in block */
 996                 last_rec = (struct llog_rec_hdr *)((char *)buf + rc -
 997                                                    le32_to_cpu(tail->lrt_len));
 998
 999                 if (LLOG_REC_HDR_NEEDS_SWABBING(last_rec))
1000                         lustre_swab_llog_rec(last_rec);
1001                 LASSERT(last_rec->lrh_index == tail->lrt_index);
1002
1003                 /* this shouldn't happen */
1004                 if (tail->lrt_index == 0) {
1005                         CERROR("%s: invalid llog tail at log id "DOSTID"/%u "
1006                                "offset "LPU64"\n",
1007                                o->do_lu.lo_dev->ld_obd->obd_name,
1008                                POSTID(&loghandle->lgh_id.lgl_oi),
1009                                loghandle->lgh_id.lgl_ogen, cur_offset);
1010                         GOTO(out, rc = -EINVAL);
1011                 }
1012                 if (tail->lrt_index < prev_idx)
1013                         continue;
1014
1015                 /* sanity check that the start of the new buffer is no farther
1016                  * than the record that we wanted.  This shouldn't happen. */
1017                 if (rec->lrh_index > prev_idx) {
1018                         CERROR("%s: missed desired record? %u > %u\n",
1019                                o->do_lu.lo_dev->ld_obd->obd_name,
1020                                rec->lrh_index, prev_idx);
1021                         GOTO(out, rc = -ENOENT);
1022                 }
1023
1024                 /* Trim unsupported extensions for compat w/ older clients */
1025                 if (!(loghandle->lgh_hdr->llh_flags & LLOG_F_EXT_JOBID))
1026                         changelog_block_trim_ext(rec, last_rec,
1027                                                  CLF_VERSION | CLF_RENAME);
1028
1029                 GOTO(out, rc = 0);
1030         }
1031         GOTO(out, rc = -EIO);
1032 out:
1033         return rc;
1034 }
1035
1036 /**
1037  * This is helper function to get llog directory object. It is used by named
1038  * llog operations to find/insert/delete llog entry from llog directory.
1039  *
1040  * \param[in] env       execution environment
1041  * \param[in] ctxt      llog context
1042  *
1043  * \retval              dt_object of llog directory
1044  * \retval              ERR_PTR of negative value on error
1045  */
1046 static struct dt_object *llog_osd_dir_get(const struct lu_env *env,
1047                                           struct llog_ctxt *ctxt)
1048 {
1049         struct dt_device        *dt;
1050         struct dt_thread_info   *dti = dt_info(env);
1051         struct dt_object        *dir;
1052         int                      rc;
1053
1054         dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
1055         if (ctxt->loc_dir == NULL) {
1056                 rc = dt_root_get(env, dt, &dti->dti_fid);
1057                 if (rc)
1058                         return ERR_PTR(rc);
1059                 dir = dt_locate(env, dt, &dti->dti_fid);
1060
1061                 if (!IS_ERR(dir) && !dt_try_as_dir(env, dir)) {
1062                         lu_object_put(env, &dir->do_lu);
1063                         return ERR_PTR(-ENOTDIR);
1064                 }
1065         } else {
1066                 lu_object_get(&ctxt->loc_dir->do_lu);
1067                 dir = ctxt->loc_dir;
1068         }
1069
1070         return dir;
1071 }
1072
1073 /**
1074  * Implementation of the llog_operations::lop_open
1075  *
1076  * This function opens the llog by its logid or by name, it may open also
1077  * non existent llog and assing then new id to it.
1078  * The llog_open/llog_close pair works similar to lu_object_find/put,
1079  * the object may not exist prior open. The result of open is just dt_object
1080  * in the llog header.
1081  *
1082  * \param[in] env               execution environment
1083  * \param[in] handle            llog handle of the current llog
1084  * \param[in] logid             logid of llog to open (nameless llog)
1085  * \param[in] name              name of llog to open (named llog)
1086  * \param[in] open_param
1087  *                              LLOG_OPEN_NEW - new llog, may not exist
1088  *                              LLOG_OPEN_EXIST - old llog, must exist
1089  *
1090  * \retval                      0 on successful open, llog_handle::lgh_obj
1091  *                              contains the dt_object of the llog.
1092  * \retval                      negative value on error
1093  */
1094 static int llog_osd_open(const struct lu_env *env, struct llog_handle *handle,
1095                          struct llog_logid *logid, char *name,
1096                          enum llog_open_param open_param)
1097 {
1098         struct llog_thread_info         *lgi = llog_info(env);
1099         struct llog_ctxt                *ctxt = handle->lgh_ctxt;
1100         struct dt_object                *o;
1101         struct dt_device                *dt;
1102         struct ls_device                *ls;
1103         struct local_oid_storage        *los = NULL;
1104         int                              rc = 0;
1105
1106         ENTRY;
1107
1108         LASSERT(env);
1109         LASSERT(ctxt);
1110         LASSERT(ctxt->loc_exp);
1111         LASSERT(ctxt->loc_exp->exp_obd);
1112         dt = ctxt->loc_exp->exp_obd->obd_lvfs_ctxt.dt;
1113         LASSERT(dt);
1114         if (ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1115                 if (logid != NULL) {
1116                         logid_to_fid(logid, &lgi->lgi_fid);
1117                 } else {
1118                         /* If logid == NULL, then it means the caller needs
1119                          * to allocate new FID (llog_cat_declare_add_rec()). */
1120                         rc = obd_fid_alloc(env, ctxt->loc_exp,
1121                                            &lgi->lgi_fid, NULL);
1122                         if (rc < 0)
1123                                 RETURN(rc);
1124                         rc = 0;
1125                 }
1126
1127                 o = dt_locate(env, dt, &lgi->lgi_fid);
1128                 if (IS_ERR(o))
1129                         RETURN(PTR_ERR(o));
1130
1131                 goto after_open;
1132         }
1133
1134         ls = ls_device_get(dt);
1135         if (IS_ERR(ls))
1136                 RETURN(PTR_ERR(ls));
1137
1138         mutex_lock(&ls->ls_los_mutex);
1139         los = dt_los_find(ls, name != NULL ? FID_SEQ_LLOG_NAME : FID_SEQ_LLOG);
1140         mutex_unlock(&ls->ls_los_mutex);
1141         LASSERT(los);
1142         ls_device_put(env, ls);
1143
1144         LASSERT(handle);
1145
1146         if (logid != NULL) {
1147                 logid_to_fid(logid, &lgi->lgi_fid);
1148         } else if (name) {
1149                 struct dt_object *llog_dir;
1150
1151                 llog_dir = llog_osd_dir_get(env, ctxt);
1152                 if (IS_ERR(llog_dir))
1153                         GOTO(out, rc = PTR_ERR(llog_dir));
1154                 dt_read_lock(env, llog_dir, 0);
1155                 rc = dt_lookup_dir(env, llog_dir, name, &lgi->lgi_fid);
1156                 dt_read_unlock(env, llog_dir);
1157                 lu_object_put(env, &llog_dir->do_lu);
1158                 if (rc == -ENOENT && open_param == LLOG_OPEN_NEW) {
1159                         /* generate fid for new llog */
1160                         rc = local_object_fid_generate(env, los,
1161                                                        &lgi->lgi_fid);
1162                 }
1163                 if (rc < 0)
1164                         GOTO(out, rc);
1165                 OBD_ALLOC(handle->lgh_name, strlen(name) + 1);
1166                 if (handle->lgh_name)
1167                         strcpy(handle->lgh_name, name);
1168                 else
1169                         GOTO(out, rc = -ENOMEM);
1170         } else {
1171                 LASSERTF(open_param & LLOG_OPEN_NEW, "%#x\n", open_param);
1172                 /* generate fid for new llog */
1173                 rc = local_object_fid_generate(env, los, &lgi->lgi_fid);
1174                 if (rc < 0)
1175                         GOTO(out, rc);
1176         }
1177
1178         o = ls_locate(env, ls, &lgi->lgi_fid, NULL);
1179         if (IS_ERR(o))
1180                 GOTO(out_name, rc = PTR_ERR(o));
1181
1182 after_open:
1183         /* No new llog is expected but doesn't exist */
1184         if (open_param != LLOG_OPEN_NEW && !dt_object_exists(o))
1185                 GOTO(out_put, rc = -ENOENT);
1186
1187         fid_to_logid(&lgi->lgi_fid, &handle->lgh_id);
1188         handle->lgh_obj = o;
1189         handle->private_data = los;
1190         LASSERT(handle->lgh_ctxt);
1191
1192         RETURN(rc);
1193
1194 out_put:
1195         lu_object_put(env, &o->do_lu);
1196 out_name:
1197         if (handle->lgh_name != NULL)
1198                 OBD_FREE(handle->lgh_name, strlen(name) + 1);
1199 out:
1200         if (los != NULL)
1201                 dt_los_put(los);
1202         RETURN(rc);
1203 }
1204
1205 /**
1206  * Implementation of the llog_operations::lop_exist
1207  *
1208  * This function checks that llog exists on storage.
1209  *
1210  * \param[in] handle    llog handle of the current llog
1211  *
1212  * \retval              true if llog object exists and is not just destroyed
1213  * \retval              false if llog doesn't exist or just destroyed
1214  */
1215 static int llog_osd_exist(struct llog_handle *handle)
1216 {
1217         LASSERT(handle->lgh_obj);
1218         return (dt_object_exists(handle->lgh_obj) &&
1219                 !lu_object_is_dying(handle->lgh_obj->do_lu.lo_header));
1220 }
1221
1222 /**
1223  * Get dir for regular fid log object
1224  *
1225  * Get directory for regular fid log object, and these regular fid log
1226  * object will be inserted under this directory, to satisfy the FS
1227  * consistency check, e2fsck etc.
1228  *
1229  * \param [in] env      execution environment
1230  * \param [in] dto      llog object
1231  *
1232  * \retval              pointer to the directory if it is found.
1233  * \retval              ERR_PTR(negative errno) if it fails.
1234  */
1235 struct dt_object *llog_osd_get_regular_fid_dir(const struct lu_env *env,
1236                                                struct dt_object *dto)
1237 {
1238         struct llog_thread_info *lgi = llog_info(env);
1239         struct seq_server_site *ss = dto->do_lu.lo_dev->ld_site->ld_seq_site;
1240         struct lu_seq_range     *range = &lgi->lgi_range;
1241         struct lu_fid           *dir_fid = &lgi->lgi_fid;
1242         struct dt_object        *dir;
1243         int                     rc;
1244         ENTRY;
1245
1246         fld_range_set_any(range);
1247         LASSERT(ss != NULL);
1248         rc = ss->ss_server_fld->lsf_seq_lookup(env, ss->ss_server_fld,
1249                                    fid_seq(lu_object_fid(&dto->do_lu)), range);
1250         if (rc < 0)
1251                 RETURN(ERR_PTR(rc));
1252
1253         lu_update_log_dir_fid(dir_fid, range->lsr_index);
1254         dir = dt_locate(env, lu2dt_dev(dto->do_lu.lo_dev), dir_fid);
1255         if (IS_ERR(dir))
1256                 RETURN(dir);
1257
1258         if (!dt_try_as_dir(env, dir)) {
1259                 lu_object_put(env, &dir->do_lu);
1260                 RETURN(ERR_PTR(-ENOTDIR));
1261         }
1262
1263         RETURN(dir);
1264 }
1265
1266 /**
1267  * Add llog object with regular FID to name entry
1268  *
1269  * Add llog object with regular FID to name space, and each llog
1270  * object on each MDT will be /update_log_dir/[seq:oid:ver],
1271  * so to satisfy the namespace consistency check, e2fsck etc.
1272  *
1273  * \param [in] env      execution environment
1274  * \param [in] dto      llog object
1275  * \param [in] th       thandle
1276  * \param [in] declare  if it is declare or execution
1277  *
1278  * \retval              0 if insertion succeeds.
1279  * \retval              negative errno if insertion fails.
1280  */
1281 static int
1282 llog_osd_regular_fid_add_name_entry(const struct lu_env *env,
1283                                     struct dt_object *dto,
1284                                     struct thandle *th, bool declare)
1285 {
1286         struct llog_thread_info *lgi = llog_info(env);
1287         const struct lu_fid     *fid = lu_object_fid(&dto->do_lu);
1288         struct dt_insert_rec    *rec = &lgi->lgi_dt_rec;
1289         struct dt_object        *dir;
1290         char                    *name = lgi->lgi_name;
1291         int                     rc;
1292         ENTRY;
1293
1294         if (!fid_is_norm(fid))
1295                 RETURN(0);
1296
1297         dir = llog_osd_get_regular_fid_dir(env, dto);
1298         if (IS_ERR(dir))
1299                 RETURN(PTR_ERR(dir));
1300
1301         rec->rec_fid = fid;
1302         rec->rec_type = S_IFREG;
1303         snprintf(name, sizeof(lgi->lgi_name), DFID, PFID(fid));
1304         dt_write_lock(env, dir, 0);
1305         if (declare) {
1306                 rc = dt_declare_insert(env, dir, (struct dt_rec *)rec,
1307                                (struct dt_key *)name, th);
1308         } else {
1309                 rc = dt_insert(env, dir, (struct dt_rec *)rec,
1310                                (struct dt_key *)name, th, 1);
1311         }
1312         dt_write_unlock(env, dir);
1313
1314         lu_object_put(env, &dir->do_lu);
1315         RETURN(rc);
1316 }
1317
1318
1319 /**
1320  * Implementation of the llog_operations::lop_declare_create
1321  *
1322  * This function declares the llog create. It declares also name insert
1323  * into llog directory in case of named llog.
1324  *
1325  * \param[in] env       execution environment
1326  * \param[in] res       llog handle of the current llog
1327  * \param[in] th        current transaction handle
1328  *
1329  * \retval              0 on successful create declaration
1330  * \retval              negative value on error
1331  */
1332 static int llog_osd_declare_create(const struct lu_env *env,
1333                                    struct llog_handle *res, struct thandle *th)
1334 {
1335         struct llog_thread_info         *lgi = llog_info(env);
1336         struct dt_insert_rec            *rec = &lgi->lgi_dt_rec;
1337         struct local_oid_storage        *los;
1338         struct dt_object                *o;
1339         int                              rc;
1340
1341         ENTRY;
1342
1343         LASSERT(res->lgh_obj);
1344         LASSERT(th);
1345
1346         /* object can be created by another thread */
1347         o = res->lgh_obj;
1348         if (dt_object_exists(o))
1349                 RETURN(0);
1350
1351         if (res->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1352                 struct llog_thread_info *lgi = llog_info(env);
1353
1354                 lgi->lgi_attr.la_valid = LA_MODE | LA_SIZE;
1355                 lgi->lgi_attr.la_size = 0;
1356                 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1357                 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1358
1359                 rc = dt_declare_create(env, o, &lgi->lgi_attr, NULL,
1360                                        &lgi->lgi_dof, th);
1361                 if (rc < 0)
1362                         RETURN(rc);
1363
1364
1365                 rc = llog_osd_regular_fid_add_name_entry(env, o, th, true);
1366
1367                 RETURN(rc);
1368         }
1369         los = res->private_data;
1370         LASSERT(los);
1371
1372         rc = llog_osd_declare_new_object(env, los, o, th);
1373         if (rc)
1374                 RETURN(rc);
1375
1376         /* do not declare header initialization here as it's declared
1377          * in llog_osd_declare_write_rec() which is always called */
1378
1379         if (res->lgh_name) {
1380                 struct dt_object *llog_dir;
1381
1382                 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
1383                 if (IS_ERR(llog_dir))
1384                         RETURN(PTR_ERR(llog_dir));
1385                 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
1386                 rec->rec_fid = &lgi->lgi_fid;
1387                 rec->rec_type = S_IFREG;
1388                 rc = dt_declare_insert(env, llog_dir,
1389                                        (struct dt_rec *)rec,
1390                                        (struct dt_key *)res->lgh_name, th);
1391                 lu_object_put(env, &llog_dir->do_lu);
1392                 if (rc)
1393                         CERROR("%s: can't declare named llog %s: rc = %d\n",
1394                                o->do_lu.lo_dev->ld_obd->obd_name,
1395                                res->lgh_name, rc);
1396         }
1397         RETURN(rc);
1398 }
1399
1400 /**
1401  * Implementation of the llog_operations::lop_create
1402  *
1403  * This function creates the llog according with llog_handle::lgh_obj
1404  * and llog_handle::lgh_name.
1405  *
1406  * \param[in] env       execution environment
1407  * \param[in] res       llog handle of the current llog
1408  * \param[in] th        current transaction handle
1409  *
1410  * \retval              0 on successful create
1411  * \retval              negative value on error
1412  */
1413 static int llog_osd_create(const struct lu_env *env, struct llog_handle *res,
1414                            struct thandle *th)
1415 {
1416         struct llog_thread_info *lgi = llog_info(env);
1417         struct dt_insert_rec    *rec = &lgi->lgi_dt_rec;
1418         struct local_oid_storage *los;
1419         struct dt_object        *o;
1420         int                      rc = 0;
1421
1422         ENTRY;
1423
1424         LASSERT(env);
1425         o = res->lgh_obj;
1426         LASSERT(o);
1427
1428         /* llog can be already created */
1429         if (dt_object_exists(o))
1430                 RETURN(-EEXIST);
1431
1432         if (res->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1433                 struct llog_thread_info *lgi = llog_info(env);
1434
1435                 lgi->lgi_attr.la_valid = LA_MODE | LA_SIZE | LA_TYPE;
1436                 lgi->lgi_attr.la_size = 0;
1437                 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1438                 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1439
1440                 dt_write_lock(env, o, 0);
1441                 rc = dt_create(env, o, &lgi->lgi_attr, NULL,
1442                                &lgi->lgi_dof, th);
1443                 dt_write_unlock(env, o);
1444                 if (rc < 0)
1445                         RETURN(rc);
1446
1447                 rc = llog_osd_regular_fid_add_name_entry(env, o, th, false);
1448
1449                 RETURN(rc);
1450         }
1451
1452         los = res->private_data;
1453         LASSERT(los);
1454
1455         dt_write_lock(env, o, 0);
1456         if (!dt_object_exists(o))
1457                 rc = llog_osd_create_new_object(env, los, o, th);
1458         else
1459                 rc = -EEXIST;
1460
1461         dt_write_unlock(env, o);
1462         if (rc)
1463                 RETURN(rc);
1464
1465         if (res->lgh_name) {
1466                 struct dt_object *llog_dir;
1467
1468                 llog_dir = llog_osd_dir_get(env, res->lgh_ctxt);
1469                 if (IS_ERR(llog_dir))
1470                         RETURN(PTR_ERR(llog_dir));
1471
1472                 logid_to_fid(&res->lgh_id, &lgi->lgi_fid);
1473                 rec->rec_fid = &lgi->lgi_fid;
1474                 rec->rec_type = S_IFREG;
1475                 dt_read_lock(env, llog_dir, 0);
1476                 rc = dt_insert(env, llog_dir, (struct dt_rec *)rec,
1477                                (struct dt_key *)res->lgh_name,
1478                                th, 1);
1479                 dt_read_unlock(env, llog_dir);
1480                 lu_object_put(env, &llog_dir->do_lu);
1481                 if (rc)
1482                         CERROR("%s: can't create named llog %s: rc = %d\n",
1483                                o->do_lu.lo_dev->ld_obd->obd_name,
1484                                res->lgh_name, rc);
1485         }
1486         RETURN(rc);
1487 }
1488
1489 /**
1490  * Implementation of the llog_operations::lop_close
1491  *
1492  * This function closes the llog. It just put llog object and referenced
1493  * local storage.
1494  *
1495  * \param[in] env       execution environment
1496  * \param[in] handle    llog handle of the current llog
1497  *
1498  * \retval              0 on successful llog close
1499  * \retval              negative value on error
1500  */
1501 static int llog_osd_close(const struct lu_env *env, struct llog_handle *handle)
1502 {
1503         struct local_oid_storage        *los;
1504         int                              rc = 0;
1505
1506         ENTRY;
1507
1508         LASSERT(handle->lgh_obj);
1509
1510         if (handle->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1511                 /* Remove the object from the cache, otherwise it may
1512                  * hold LOD being released during cleanup process */
1513                 lu_object_put_nocache(env, &handle->lgh_obj->do_lu);
1514                 LASSERT(handle->private_data == NULL);
1515                 RETURN(rc);
1516         } else {
1517                 lu_object_put(env, &handle->lgh_obj->do_lu);
1518         }
1519         los = handle->private_data;
1520         LASSERT(los);
1521         dt_los_put(los);
1522
1523         if (handle->lgh_name)
1524                 OBD_FREE(handle->lgh_name, strlen(handle->lgh_name) + 1);
1525
1526         RETURN(rc);
1527 }
1528
1529 /**
1530  * delete llog object name entry
1531  *
1532  * Delete llog object (with regular FID) from name space (under
1533  * update_log_dir).
1534  *
1535  * \param [in] env      execution environment
1536  * \param [in] dto      llog object
1537  * \param [in] th       thandle
1538  * \param [in] declare  if it is declare or execution
1539  *
1540  * \retval              0 if deletion succeeds.
1541  * \retval              negative errno if deletion fails.
1542  */
1543 static int
1544 llog_osd_regular_fid_del_name_entry(const struct lu_env *env,
1545                                     struct dt_object *dto,
1546                                     struct thandle *th, bool declare)
1547 {
1548         struct llog_thread_info *lgi = llog_info(env);
1549         const struct lu_fid     *fid = lu_object_fid(&dto->do_lu);
1550         struct dt_object        *dir;
1551         char                    *name = lgi->lgi_name;
1552         int                     rc;
1553         ENTRY;
1554
1555         if (!fid_is_norm(fid))
1556                 RETURN(0);
1557
1558         dir = llog_osd_get_regular_fid_dir(env, dto);
1559         if (IS_ERR(dir))
1560                 RETURN(PTR_ERR(dir));
1561
1562         snprintf(name, sizeof(lgi->lgi_name), DFID, PFID(fid));
1563         dt_write_lock(env, dir, 0);
1564         if (declare) {
1565                 rc = dt_declare_delete(env, dir, (struct dt_key *)name,
1566                                        th);
1567         } else {
1568                 rc = dt_delete(env, dir, (struct dt_key *)name, th);
1569         }
1570         dt_write_unlock(env, dir);
1571
1572         lu_object_put(env, &dir->do_lu);
1573         RETURN(rc);
1574 }
1575
1576 /**
1577  * Implementation of the llog_operations::lop_declare_destroy
1578  *
1579  * This function declare destroys the llog and deletes also entry in the
1580  * llog directory in case of named llog. Llog should be opened prior that.
1581  *
1582  * \param[in] env               execution environment
1583  * \param[in] loghandle llog handle of the current llog
1584  *
1585  * \retval              0 on successful destroy
1586  * \retval              negative value on error
1587  */
1588 static int llog_osd_declare_destroy(const struct lu_env *env,
1589                                     struct llog_handle *loghandle,
1590                                     struct thandle *th)
1591 {
1592         struct llog_ctxt        *ctxt;
1593         struct dt_object        *o, *llog_dir = NULL;
1594         int                      rc;
1595
1596         ENTRY;
1597
1598         ctxt = loghandle->lgh_ctxt;
1599         LASSERT(ctxt);
1600
1601         o = loghandle->lgh_obj;
1602         LASSERT(o);
1603
1604         if (loghandle->lgh_name) {
1605                 llog_dir = llog_osd_dir_get(env, ctxt);
1606                 if (IS_ERR(llog_dir))
1607                         RETURN(PTR_ERR(llog_dir));
1608
1609                 rc = dt_declare_delete(env, llog_dir,
1610                                        (struct dt_key *)loghandle->lgh_name,
1611                                        th);
1612                 if (rc < 0)
1613                         GOTO(out_put, rc);
1614         }
1615
1616         rc = dt_declare_ref_del(env, o, th);
1617         if (rc < 0)
1618                 GOTO(out_put, rc);
1619
1620         rc = dt_declare_destroy(env, o, th);
1621         if (rc < 0)
1622                 GOTO(out_put, rc);
1623
1624         if (loghandle->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1625                 rc = llog_osd_regular_fid_del_name_entry(env, o, th, true);
1626                 if (rc < 0)
1627                         GOTO(out_put, rc);
1628         }
1629
1630 out_put:
1631         if (!(IS_ERR_OR_NULL(llog_dir)))
1632                 lu_object_put(env, &llog_dir->do_lu);
1633
1634         RETURN(rc);
1635 }
1636
1637
1638 /**
1639  * Implementation of the llog_operations::lop_destroy
1640  *
1641  * This function destroys the llog and deletes also entry in the
1642  * llog directory in case of named llog. Llog should be opened prior that.
1643  * Destroy method is not part of external transaction and does everything
1644  * inside.
1645  *
1646  * \param[in] env               execution environment
1647  * \param[in] loghandle llog handle of the current llog
1648  *
1649  * \retval              0 on successful destroy
1650  * \retval              negative value on error
1651  */
1652 static int llog_osd_destroy(const struct lu_env *env,
1653                             struct llog_handle *loghandle, struct thandle *th)
1654 {
1655         struct llog_ctxt        *ctxt;
1656         struct dt_object        *o, *llog_dir = NULL;
1657         int                      rc;
1658
1659         ENTRY;
1660
1661         ctxt = loghandle->lgh_ctxt;
1662         LASSERT(ctxt != NULL);
1663
1664         o = loghandle->lgh_obj;
1665         LASSERT(o != NULL);
1666
1667         dt_write_lock(env, o, 0);
1668         if (!dt_object_exists(o))
1669                 GOTO(out_unlock, rc = 0);
1670
1671         if (loghandle->lgh_name) {
1672                 llog_dir = llog_osd_dir_get(env, ctxt);
1673                 if (IS_ERR(llog_dir))
1674                         RETURN(PTR_ERR(llog_dir));
1675
1676                 dt_read_lock(env, llog_dir, 0);
1677                 rc = dt_delete(env, llog_dir,
1678                                (struct dt_key *)loghandle->lgh_name,
1679                                th);
1680                 dt_read_unlock(env, llog_dir);
1681                 if (rc) {
1682                         CERROR("%s: can't remove llog %s: rc = %d\n",
1683                                o->do_lu.lo_dev->ld_obd->obd_name,
1684                                loghandle->lgh_name, rc);
1685                         GOTO(out_unlock, rc);
1686                 }
1687         }
1688
1689         dt_ref_del(env, o, th);
1690         rc = dt_destroy(env, o, th);
1691         if (rc < 0)
1692                 GOTO(out_unlock, rc);
1693
1694         if (loghandle->lgh_ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID) {
1695                 rc = llog_osd_regular_fid_del_name_entry(env, o, th, false);
1696                 if (rc < 0)
1697                         GOTO(out_unlock, rc);
1698         }
1699
1700 out_unlock:
1701         dt_write_unlock(env, o);
1702         if (!(IS_ERR_OR_NULL(llog_dir)))
1703                 lu_object_put(env, &llog_dir->do_lu);
1704         RETURN(rc);
1705 }
1706
1707 /**
1708  * Implementation of the llog_operations::lop_setup
1709  *
1710  * This function setup the llog on local storage.
1711  *
1712  * \param[in] env       execution environment
1713  * \param[in] obd       obd device the llog belongs to
1714  * \param[in] olg       the llog group, it is always zero group now.
1715  * \param[in] ctxt_idx  the llog index, it defines the purpose of this llog.
1716  *                      Every new llog type have to use own index.
1717  * \param[in] disk_obd  the storage obd, where llog is stored.
1718  *
1719  * \retval              0 on successful llog setup
1720  * \retval              negative value on error
1721  */
1722 static int llog_osd_setup(const struct lu_env *env, struct obd_device *obd,
1723                           struct obd_llog_group *olg, int ctxt_idx,
1724                           struct obd_device *disk_obd)
1725 {
1726         struct llog_thread_info         *lgi = llog_info(env);
1727         struct llog_ctxt                *ctxt;
1728         int                              rc = 0;
1729         ENTRY;
1730
1731         LASSERT(obd);
1732         LASSERT(olg->olg_ctxts[ctxt_idx]);
1733
1734         ctxt = llog_ctxt_get(olg->olg_ctxts[ctxt_idx]);
1735         LASSERT(ctxt);
1736
1737         if (disk_obd == NULL)
1738                 GOTO(out, rc = 0);
1739
1740         /* initialize data allowing to generate new fids,
1741          * literally we need a sequece */
1742         lgi->lgi_fid.f_seq = FID_SEQ_LLOG;
1743         lgi->lgi_fid.f_oid = 1;
1744         lgi->lgi_fid.f_ver = 0;
1745         rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1746                                     &lgi->lgi_fid,
1747                                     &ctxt->loc_los_nameless);
1748         if (rc != 0)
1749                 GOTO(out, rc);
1750
1751         lgi->lgi_fid.f_seq = FID_SEQ_LLOG_NAME;
1752         lgi->lgi_fid.f_oid = 1;
1753         lgi->lgi_fid.f_ver = 0;
1754         rc = local_oid_storage_init(env, disk_obd->obd_lvfs_ctxt.dt,
1755                                     &lgi->lgi_fid,
1756                                     &ctxt->loc_los_named);
1757         if (rc != 0) {
1758                 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1759                 ctxt->loc_los_nameless = NULL;
1760         }
1761
1762         GOTO(out, rc);
1763
1764 out:
1765         llog_ctxt_put(ctxt);
1766         return rc;
1767 }
1768
1769 /**
1770  * Implementation of the llog_operations::lop_cleanup
1771  *
1772  * This function cleanups the llog on local storage.
1773  *
1774  * \param[in] env       execution environment
1775  * \param[in] ctxt      the llog context
1776  *
1777  * \retval              0
1778  */
1779 static int llog_osd_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
1780 {
1781         if (ctxt->loc_los_nameless != NULL) {
1782                 local_oid_storage_fini(env, ctxt->loc_los_nameless);
1783                 ctxt->loc_los_nameless = NULL;
1784         }
1785
1786         if (ctxt->loc_los_named != NULL) {
1787                 local_oid_storage_fini(env, ctxt->loc_los_named);
1788                 ctxt->loc_los_named = NULL;
1789         }
1790
1791         return 0;
1792 }
1793
1794 struct llog_operations llog_osd_ops = {
1795         .lop_next_block         = llog_osd_next_block,
1796         .lop_prev_block         = llog_osd_prev_block,
1797         .lop_read_header        = llog_osd_read_header,
1798         .lop_declare_destroy    = llog_osd_declare_destroy,
1799         .lop_destroy            = llog_osd_destroy,
1800         .lop_setup              = llog_osd_setup,
1801         .lop_cleanup            = llog_osd_cleanup,
1802         .lop_open               = llog_osd_open,
1803         .lop_exist              = llog_osd_exist,
1804         .lop_declare_create     = llog_osd_declare_create,
1805         .lop_create             = llog_osd_create,
1806         .lop_declare_write_rec  = llog_osd_declare_write_rec,
1807         .lop_write_rec          = llog_osd_write_rec,
1808         .lop_close              = llog_osd_close,
1809 };
1810 EXPORT_SYMBOL(llog_osd_ops);
1811
1812 struct llog_operations llog_common_cat_ops = {
1813         .lop_next_block         = llog_osd_next_block,
1814         .lop_prev_block         = llog_osd_prev_block,
1815         .lop_read_header        = llog_osd_read_header,
1816         .lop_declare_destroy    = llog_osd_declare_destroy,
1817         .lop_destroy            = llog_osd_destroy,
1818         .lop_setup              = llog_osd_setup,
1819         .lop_cleanup            = llog_osd_cleanup,
1820         .lop_open               = llog_osd_open,
1821         .lop_exist              = llog_osd_exist,
1822         .lop_declare_create     = llog_osd_declare_create,
1823         .lop_create             = llog_osd_create,
1824         .lop_declare_write_rec  = llog_osd_declare_write_rec,
1825         .lop_write_rec          = llog_osd_write_rec,
1826         .lop_close              = llog_osd_close,
1827         .lop_add                = llog_cat_add_rec,
1828         .lop_declare_add        = llog_cat_declare_add_rec,
1829 };
1830 EXPORT_SYMBOL(llog_common_cat_ops);
1831
1832 /**
1833  * Read the special file which contains the list of llog catalogs IDs
1834  *
1835  * This function reads the CATALOGS file which contains the array of llog
1836  * catalogs IDs. The main purpose of this file is to store OSP llogs indexed
1837  * by OST/MDT number.
1838  *
1839  * \param[in]  env              execution environment
1840  * \param[in]  d                corresponding storage device
1841  * \param[in]  idx              position to start from, usually OST/MDT index
1842  * \param[in]  count            how many catalog IDs to read
1843  * \param[out] idarray          the buffer for the data. If it is NULL then
1844  *                              function returns just number of catalog IDs
1845  *                              in the file.
1846  * \param[in]  fid              LLOG_CATALOGS_OID for CATALOG object
1847  *
1848  * \retval                      0 on successful read of catalog IDs
1849  * \retval                      negative value on error
1850  * \retval                      positive value which is number of records in
1851  *                              the file if \a idarray is NULL
1852  */
1853 int llog_osd_get_cat_list(const struct lu_env *env, struct dt_device *d,
1854                           int idx, int count, struct llog_catid *idarray,
1855                           const struct lu_fid *fid)
1856 {
1857         struct llog_thread_info *lgi = llog_info(env);
1858         struct dt_object        *o = NULL;
1859         struct thandle          *th;
1860         int                      rc, size;
1861
1862         ENTRY;
1863
1864         LASSERT(d);
1865
1866         size = sizeof(*idarray) * count;
1867         lgi->lgi_off = idx *  sizeof(*idarray);
1868
1869         lgi->lgi_fid = *fid;
1870         o = dt_locate(env, d, &lgi->lgi_fid);
1871         if (IS_ERR(o))
1872                 RETURN(PTR_ERR(o));
1873
1874         if (!dt_object_exists(o)) {
1875                 th = dt_trans_create(env, d);
1876                 if (IS_ERR(th))
1877                         GOTO(out, rc = PTR_ERR(th));
1878
1879                 lgi->lgi_attr.la_valid = LA_MODE;
1880                 lgi->lgi_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1881                 lgi->lgi_dof.dof_type = dt_mode_to_dft(S_IFREG);
1882
1883                 th->th_wait_submit = 1;
1884                 /* Make the llog object creation synchronization, so
1885                  * it will be reliable to the reference, especially
1886                  * for remote reference */
1887                 th->th_sync = 1;
1888
1889                 rc = dt_declare_create(env, o, &lgi->lgi_attr, NULL,
1890                                        &lgi->lgi_dof, th);
1891                 if (rc)
1892                         GOTO(out_trans, rc);
1893
1894                 rc = dt_trans_start_local(env, d, th);
1895                 if (rc)
1896                         GOTO(out_trans, rc);
1897
1898                 dt_write_lock(env, o, 0);
1899                 if (!dt_object_exists(o))
1900                         rc = dt_create(env, o, &lgi->lgi_attr, NULL,
1901                                        &lgi->lgi_dof, th);
1902                 dt_write_unlock(env, o);
1903 out_trans:
1904                 dt_trans_stop(env, d, th);
1905                 if (rc)
1906                         GOTO(out, rc);
1907         }
1908
1909         rc = dt_attr_get(env, o, &lgi->lgi_attr);
1910         if (rc)
1911                 GOTO(out, rc);
1912
1913         if (!S_ISREG(lgi->lgi_attr.la_mode)) {
1914                 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
1915                        o->do_lu.lo_dev->ld_obd->obd_name,
1916                        lgi->lgi_attr.la_mode);
1917                 GOTO(out, rc = -ENOENT);
1918         }
1919
1920         CDEBUG(D_CONFIG, "cat list: disk size=%d, read=%d\n",
1921                (int)lgi->lgi_attr.la_size, size);
1922
1923         /* return just number of llogs */
1924         if (idarray == NULL) {
1925                 rc = lgi->lgi_attr.la_size / sizeof(*idarray);
1926                 GOTO(out, rc);
1927         }
1928
1929         /* read for new ost index or for empty file */
1930         memset(idarray, 0, size);
1931         if (lgi->lgi_attr.la_size <= lgi->lgi_off)
1932                 GOTO(out, rc = 0);
1933         if (lgi->lgi_attr.la_size < lgi->lgi_off + size)
1934                 size = lgi->lgi_attr.la_size - lgi->lgi_off;
1935
1936         lgi->lgi_buf.lb_buf = idarray;
1937         lgi->lgi_buf.lb_len = size;
1938         rc = dt_record_read(env, o, &lgi->lgi_buf, &lgi->lgi_off);
1939         /* -EFAULT means the llog is a sparse file. This is not an error
1940          * after arbitrary OST index is supported. */
1941         if (rc < 0 && rc != -EFAULT) {
1942                 CERROR("%s: error reading CATALOGS: rc = %d\n",
1943                        o->do_lu.lo_dev->ld_obd->obd_name,  rc);
1944                 GOTO(out, rc);
1945         }
1946
1947         EXIT;
1948 out:
1949         lu_object_put(env, &o->do_lu);
1950         RETURN(rc);
1951 }
1952 EXPORT_SYMBOL(llog_osd_get_cat_list);
1953
1954 /**
1955  * Write the special file which contains the list of llog catalogs IDs
1956  *
1957  * This function writes the CATALOG file which contains the array of llog
1958  * catalogs IDs. It is used mostly to store OSP llogs indexed by OST/MDT
1959  * number.
1960  *
1961  * \param[in]  env      execution environment
1962  * \param[in]  d        corresponding storage device
1963  * \param[in]  idx      position to start from, usually OST/MDT index
1964  * \param[in]  count    how many catalog IDs to write
1965  * \param[out] idarray  the buffer with the data to write.
1966  * \param[in]  fid      LLOG_CATALOGS_OID for CATALOG object
1967  *
1968  * \retval              0 on successful write of catalog IDs
1969  * \retval              negative value on error
1970  */
1971 int llog_osd_put_cat_list(const struct lu_env *env, struct dt_device *d,
1972                           int idx, int count, struct llog_catid *idarray,
1973                           const struct lu_fid *fid)
1974 {
1975         struct llog_thread_info *lgi = llog_info(env);
1976         struct dt_object        *o = NULL;
1977         struct thandle          *th;
1978         int                      rc, size;
1979
1980         if (count == 0)
1981                 RETURN(0);
1982
1983         LASSERT(d);
1984
1985         size = sizeof(*idarray) * count;
1986         lgi->lgi_off = idx * sizeof(*idarray);
1987         lgi->lgi_fid = *fid;
1988
1989         o = dt_locate(env, d, &lgi->lgi_fid);
1990         if (IS_ERR(o))
1991                 RETURN(PTR_ERR(o));
1992
1993         if (!dt_object_exists(o))
1994                 GOTO(out, rc = -ENOENT);
1995
1996         rc = dt_attr_get(env, o, &lgi->lgi_attr);
1997         if (rc)
1998                 GOTO(out, rc);
1999
2000         if (!S_ISREG(lgi->lgi_attr.la_mode)) {
2001                 CERROR("%s: CATALOGS is not a regular file!: mode = %o\n",
2002                        o->do_lu.lo_dev->ld_obd->obd_name,
2003                        lgi->lgi_attr.la_mode);
2004                 GOTO(out, rc = -ENOENT);
2005         }
2006
2007         th = dt_trans_create(env, d);
2008         if (IS_ERR(th))
2009                 GOTO(out, rc = PTR_ERR(th));
2010
2011         lgi->lgi_buf.lb_len = size;
2012         lgi->lgi_buf.lb_buf = idarray;
2013         rc = dt_declare_record_write(env, o, &lgi->lgi_buf, lgi->lgi_off, th);
2014         if (rc)
2015                 GOTO(out_trans, rc);
2016
2017         /* For update log, this happens during initialization,
2018          * see lod_sub_prep_llog(), and we need make sure catlog
2019          * file ID is written to catlist file(committed) before
2020          * cross-MDT operation write update records to catlog FILE,
2021          * otherwise, during failover these update records might
2022          * missing */
2023         if (fid_is_update_log(fid))
2024                 th->th_sync = 1;
2025
2026         rc = dt_trans_start_local(env, d, th);
2027         if (rc)
2028                 GOTO(out_trans, rc);
2029
2030         th->th_wait_submit = 1;
2031
2032         rc = dt_record_write(env, o, &lgi->lgi_buf, &lgi->lgi_off, th);
2033         if (rc)
2034                 CDEBUG(D_INODE, "can't write CATALOGS at index %d: rc = %d\n",
2035                        idx, rc);
2036 out_trans:
2037         dt_trans_stop(env, d, th);
2038 out:
2039         lu_object_put(env, &o->do_lu);
2040         RETURN(rc);
2041 }
2042 EXPORT_SYMBOL(llog_osd_put_cat_list);