lustre/osd-ldiskfs/osd_scrub.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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2012, 2013, Intel Corporation.
  24  */
  25 /*
  26  * lustre/osd-ldiskfs/osd_scrub.c
  27  *
  28  * Top-level entry points into osd module
  29  *
  30  * The OI scrub is used for rebuilding Object Index files when restores MDT from
  31  * file-level backup.
  32  *
  33  * The otable based iterator scans ldiskfs inode table to feed up layer LFSCK.
  34  *
  35  * Author: Fan Yong <yong.fan@whamcloud.com>
  36  */
  37
  38 #ifndef EXPORT_SYMTAB
  39 # define EXPORT_SYMTAB
  40 #endif
  41 #define DEBUG_SUBSYSTEM S_MDS
  42
  43 #include <lustre/lustre_idl.h>
  44 #include <lustre_disk.h>
  45 #include <dt_object.h>
  46
  47 #include "osd_internal.h"
  48 #include "osd_oi.h"
  49 #include "osd_scrub.h"
  50
  51 #define HALF_SEC        (CFS_HZ >> 1)
  52
  53 #define OSD_OTABLE_MAX_HASH             0x00000000ffffffffULL
  54
  55 #define SCRUB_NEXT_BREAK        1 /* exit current loop and process next group */
  56 #define SCRUB_NEXT_CONTINUE     2 /* skip current object and process next bit */
  57 #define SCRUB_NEXT_EXIT         3 /* exit all the loops */
  58 #define SCRUB_NEXT_WAIT         4 /* wait for free cache slot */
  59 #define SCRUB_NEXT_CRASH        5 /* simulate system crash during OI scrub */
  60 #define SCRUB_NEXT_FATAL        6 /* simulate failure during OI scrub */
  61 #define SCRUB_NEXT_NOSCRUB      7 /* new created object, no scrub on it */
  62 #define SCRUB_NEXT_NOLMA        8 /* the inode has no FID-in-LMA */
  63
  64 /* misc functions */
  65
  66 static inline struct osd_device *osd_scrub2dev(struct osd_scrub *scrub)
  67 {
  68         return container_of0(scrub, struct osd_device, od_scrub);
  69 }
  70
  71 static inline struct super_block *osd_scrub2sb(struct osd_scrub *scrub)
  72 {
  73         return osd_sb(osd_scrub2dev(scrub));
  74 }
  75
  76 static inline int osd_scrub_has_window(struct osd_scrub *scrub,
  77                                        struct osd_otable_cache *ooc)
  78 {
  79         return scrub->os_pos_current < ooc->ooc_pos_preload + SCRUB_WINDOW_SIZE;
  80 }
  81
  82 /**
  83  * update/insert/delete the specified OI mapping (@fid @id) according to the ops
  84  *
  85  * \retval   1, changed nothing
  86  * \retval   0, changed successfully
  87  * \retval -ve, on error
  88  */
  89 static int osd_scrub_refresh_mapping(struct osd_thread_info *info,
  90                                      struct osd_device *dev,
  91                                      const struct lu_fid *fid,
  92                                      const struct osd_inode_id *id, int ops)
  93 {
  94         struct lu_fid         *oi_fid = &info->oti_fid2;
  95         struct osd_inode_id   *oi_id  = &info->oti_id2;
  96         struct iam_container  *bag;
  97         struct iam_path_descr *ipd;
  98         handle_t              *jh;
  99         int                    rc;
 100         ENTRY;
 101
 102         fid_cpu_to_be(oi_fid, fid);
 103         osd_id_pack(oi_id, id);
 104         jh = ldiskfs_journal_start_sb(osd_sb(dev),
 105                                       osd_dto_credits_noquota[ops]);
 106         if (IS_ERR(jh)) {
 107                 rc = PTR_ERR(jh);
 108                 CERROR("%.16s: fail to start trans for scrub store: rc = %d\n",
 109                        LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name, rc);
 110                 RETURN(rc);
 111         }
 112
 113         bag = &osd_fid2oi(dev, fid)->oi_dir.od_container;
 114         ipd = osd_idx_ipd_get(info->oti_env, bag);
 115         if (unlikely(ipd == NULL)) {
 116                 ldiskfs_journal_stop(jh);
 117                 CERROR("%.16s: fail to get ipd for scrub store\n",
 118                        LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name);
 119                 RETURN(-ENOMEM);
 120         }
 121
 122         switch (ops) {
 123         case DTO_INDEX_UPDATE:
 124                 rc = iam_update(jh, bag, (const struct iam_key *)oi_fid,
 125                                 (struct iam_rec *)oi_id, ipd);
 126                 if (unlikely(rc == -ENOENT)) {
 127                         /* Some unlink thread may removed the OI mapping. */
 128                         rc = 1;
 129                 }
 130                 break;
 131         case DTO_INDEX_INSERT:
 132                 rc = iam_insert(jh, bag, (const struct iam_key *)oi_fid,
 133                                 (struct iam_rec *)oi_id, ipd);
 134                 if (unlikely(rc == -EEXIST)) {
 135                         rc = 1;
 136                         /* XXX: There are trouble things when adding OI
 137                          *      mapping for IGIF object, which may cause
 138                          *      multiple objects to be mapped to the same
 139                          *      IGIF formatted FID. Consider the following
 140                          *      situations:
 141                          *
 142                          *      1) The MDT is upgrading from 1.8 device.
 143                          *      The OI scrub generates IGIF FID1 for the
 144                          *      OBJ1 and adds the OI mapping.
 145                          *
 146                          *      2) For some reason, the OI scrub does not
 147                          *      process all the IGIF objects completely.
 148                          *
 149                          *      3) The MDT is backuped and restored against
 150                          *      this device.
 151                          *
 152                          *      4) When the MDT mounts up, the OI scrub will
 153                          *      try to rebuild the OI files. For some IGIF
 154                          *      object, OBJ2, which was not processed by the
 155                          *      OI scrub before the backup/restore, and the
 156                          *      new generated IGIF formatted FID may be just
 157                          *      the FID1, the same as OBJ1.
 158                          *
 159                          *      Under such case, the OI scrub cannot know how
 160                          *      to generate new FID for the OBJ2.
 161                          *
 162                          *      Currently, we do nothing for that. One possible
 163                          *      solution is to generate new normal FID for the
 164                          *      conflict object.
 165                          *
 166                          *      Anyway, it is rare, only exists in theory. */
 167                 }
 168                 break;
 169         case DTO_INDEX_DELETE:
 170                 rc = iam_delete(jh, bag, (const struct iam_key *)oi_fid, ipd);
 171                 if (rc == -ENOENT) {
 172                         /* It is normal that the unlink thread has removed the
 173                          * OI mapping already. */
 174                         rc = 1;
 175                 }
 176                 break;
 177         default:
 178                 LASSERTF(0, "Unexpected ops %d\n", ops);
 179                 break;
 180         }
 181         osd_ipd_put(info->oti_env, bag, ipd);
 182         ldiskfs_journal_stop(jh);
 183         RETURN(rc);
 184 }
 185
 186 /* OI_scrub file ops */
 187
 188 static void osd_scrub_file_to_cpu(struct scrub_file *des,
 189                                   struct scrub_file *src)
 190 {
 191         memcpy(des->sf_uuid, src->sf_uuid, 16);
 192         des->sf_flags   = le64_to_cpu(src->sf_flags);
 193         des->sf_magic   = le32_to_cpu(src->sf_magic);
 194         des->sf_status  = le16_to_cpu(src->sf_status);
 195         des->sf_param   = le16_to_cpu(src->sf_param);
 196         des->sf_time_last_complete      =
 197                                 le64_to_cpu(src->sf_time_last_complete);
 198         des->sf_time_latest_start       =
 199                                 le64_to_cpu(src->sf_time_latest_start);
 200         des->sf_time_last_checkpoint    =
 201                                 le64_to_cpu(src->sf_time_last_checkpoint);
 202         des->sf_pos_latest_start        =
 203                                 le64_to_cpu(src->sf_pos_latest_start);
 204         des->sf_pos_last_checkpoint     =
 205                                 le64_to_cpu(src->sf_pos_last_checkpoint);
 206         des->sf_pos_first_inconsistent  =
 207                                 le64_to_cpu(src->sf_pos_first_inconsistent);
 208         des->sf_items_checked           =
 209                                 le64_to_cpu(src->sf_items_checked);
 210         des->sf_items_updated           =
 211                                 le64_to_cpu(src->sf_items_updated);
 212         des->sf_items_failed            =
 213                                 le64_to_cpu(src->sf_items_failed);
 214         des->sf_items_updated_prior     =
 215                                 le64_to_cpu(src->sf_items_updated_prior);
 216         des->sf_run_time        = le32_to_cpu(src->sf_run_time);
 217         des->sf_success_count   = le32_to_cpu(src->sf_success_count);
 218         des->sf_oi_count        = le16_to_cpu(src->sf_oi_count);
 219         memcpy(des->sf_oi_bitmap, src->sf_oi_bitmap, SCRUB_OI_BITMAP_SIZE);
 220 }
 221
 222 static void osd_scrub_file_to_le(struct scrub_file *des,
 223                                  struct scrub_file *src)
 224 {
 225         memcpy(des->sf_uuid, src->sf_uuid, 16);
 226         des->sf_flags   = cpu_to_le64(src->sf_flags);
 227         des->sf_magic   = cpu_to_le32(src->sf_magic);
 228         des->sf_status  = cpu_to_le16(src->sf_status);
 229         des->sf_param   = cpu_to_le16(src->sf_param);
 230         des->sf_time_last_complete      =
 231                                 cpu_to_le64(src->sf_time_last_complete);
 232         des->sf_time_latest_start       =
 233                                 cpu_to_le64(src->sf_time_latest_start);
 234         des->sf_time_last_checkpoint    =
 235                                 cpu_to_le64(src->sf_time_last_checkpoint);
 236         des->sf_pos_latest_start        =
 237                                 cpu_to_le64(src->sf_pos_latest_start);
 238         des->sf_pos_last_checkpoint     =
 239                                 cpu_to_le64(src->sf_pos_last_checkpoint);
 240         des->sf_pos_first_inconsistent  =
 241                                 cpu_to_le64(src->sf_pos_first_inconsistent);
 242         des->sf_items_checked           =
 243                                 cpu_to_le64(src->sf_items_checked);
 244         des->sf_items_updated           =
 245                                 cpu_to_le64(src->sf_items_updated);
 246         des->sf_items_failed            =
 247                                 cpu_to_le64(src->sf_items_failed);
 248         des->sf_items_updated_prior     =
 249                                 cpu_to_le64(src->sf_items_updated_prior);
 250         des->sf_run_time        = cpu_to_le32(src->sf_run_time);
 251         des->sf_success_count   = cpu_to_le32(src->sf_success_count);
 252         des->sf_oi_count        = cpu_to_le16(src->sf_oi_count);
 253         memcpy(des->sf_oi_bitmap, src->sf_oi_bitmap, SCRUB_OI_BITMAP_SIZE);
 254 }
 255
 256 static void osd_scrub_file_init(struct osd_scrub *scrub, __u8 *uuid)
 257 {
 258         struct scrub_file *sf = &scrub->os_file;
 259
 260         memset(sf, 0, sizeof(*sf));
 261         memcpy(sf->sf_uuid, uuid, 16);
 262         sf->sf_magic = SCRUB_MAGIC_V1;
 263         sf->sf_status = SS_INIT;
 264 }
 265
 266 void osd_scrub_file_reset(struct osd_scrub *scrub, __u8 *uuid, __u64 flags)
 267 {
 268         struct scrub_file *sf = &scrub->os_file;
 269
 270         CDEBUG(D_LFSCK, "Reset OI scrub file, flags = "LPX64"\n", flags);
 271         memcpy(sf->sf_uuid, uuid, 16);
 272         sf->sf_status = SS_INIT;
 273         sf->sf_flags |= flags;
 274         sf->sf_param = 0;
 275         sf->sf_run_time = 0;
 276         sf->sf_time_latest_start = 0;
 277         sf->sf_time_last_checkpoint = 0;
 278         sf->sf_pos_latest_start = 0;
 279         sf->sf_pos_last_checkpoint = 0;
 280         sf->sf_pos_first_inconsistent = 0;
 281         sf->sf_items_checked = 0;
 282         sf->sf_items_updated = 0;
 283         sf->sf_items_failed = 0;
 284         sf->sf_items_updated_prior = 0;
 285         sf->sf_items_noscrub = 0;
 286         sf->sf_items_igif = 0;
 287 }
 288
 289 static int osd_scrub_file_load(struct osd_scrub *scrub)
 290 {
 291         loff_t  pos  = 0;
 292         char   *name = LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name;
 293         int     len  = sizeof(scrub->os_file_disk);
 294         int     rc;
 295
 296         rc = osd_ldiskfs_read(scrub->os_inode, &scrub->os_file_disk, len, &pos);
 297         if (rc == len) {
 298                 struct scrub_file *sf = &scrub->os_file;
 299
 300                 osd_scrub_file_to_cpu(sf, &scrub->os_file_disk);
 301                 if (sf->sf_magic != SCRUB_MAGIC_V1) {
 302                         CWARN("%.16s: invalid scrub magic 0x%x != 0x%x\n,",
 303                               name, sf->sf_magic, SCRUB_MAGIC_V1);
 304                         /* Process it as new scrub file. */
 305                         rc = -ENOENT;
 306                 } else {
 307                         rc = 0;
 308                 }
 309         } else if (rc != 0) {
 310                 CERROR("%.16s: fail to load scrub file, expected = %d, "
 311                        "rc = %d\n", name, len, rc);
 312                 if (rc > 0)
 313                         rc = -EFAULT;
 314         } else {
 315                 /* return -ENOENT for empty scrub file case. */
 316                 rc = -ENOENT;
 317         }
 318
 319         return rc;
 320 }
 321
 322 int osd_scrub_file_store(struct osd_scrub *scrub)
 323 {
 324         struct osd_device *dev;
 325         handle_t          *jh;
 326         loff_t             pos     = 0;
 327         int                len     = sizeof(scrub->os_file_disk);
 328         int                credits;
 329         int                rc;
 330
 331         dev = container_of0(scrub, struct osd_device, od_scrub);
 332         credits = osd_dto_credits_noquota[DTO_WRITE_BASE] +
 333                   osd_dto_credits_noquota[DTO_WRITE_BLOCK];
 334         jh = ldiskfs_journal_start_sb(osd_sb(dev), credits);
 335         if (IS_ERR(jh)) {
 336                 rc = PTR_ERR(jh);
 337                 CERROR("%.16s: fail to start trans for scrub store, rc = %d\n",
 338                        LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,rc);
 339                 return rc;
 340         }
 341
 342         osd_scrub_file_to_le(&scrub->os_file_disk, &scrub->os_file);
 343         rc = osd_ldiskfs_write_record(scrub->os_inode, &scrub->os_file_disk,
 344                                       len, 0, &pos, jh);
 345         ldiskfs_journal_stop(jh);
 346         if (rc != 0)
 347                 CERROR("%.16s: fail to store scrub file, expected = %d, "
 348                        "rc = %d\n",
 349                        LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,
 350                        len, rc);
 351         scrub->os_time_last_checkpoint = cfs_time_current();
 352         scrub->os_time_next_checkpoint = scrub->os_time_last_checkpoint +
 353                                 cfs_time_seconds(SCRUB_CHECKPOINT_INTERVAL);
 354         return rc;
 355 }
 356
 357 /* OI scrub APIs */
 358
 359 static int osd_scrub_prep(struct osd_device *dev)
 360 {
 361         struct osd_scrub     *scrub  = &dev->od_scrub;
 362         struct ptlrpc_thread *thread = &scrub->os_thread;
 363         struct scrub_file    *sf     = &scrub->os_file;
 364         __u32                 flags  = scrub->os_start_flags;
 365         int                   rc;
 366         ENTRY;
 367
 368         down_write(&scrub->os_rwsem);
 369         if (flags & SS_SET_FAILOUT)
 370                 sf->sf_param |= SP_FAILOUT;
 371
 372         if (flags & SS_CLEAR_FAILOUT)
 373                 sf->sf_param &= ~SP_FAILOUT;
 374
 375         if (flags & SS_RESET)
 376                 osd_scrub_file_reset(scrub,
 377                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid, 0);
 378
 379         if (flags & SS_AUTO) {
 380                 scrub->os_full_speed = 1;
 381                 sf->sf_flags |= SF_AUTO;
 382         } else {
 383                 scrub->os_full_speed = 0;
 384         }
 385
 386         if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT | SF_UPGRADE))
 387                 scrub->os_full_speed = 1;
 388
 389         scrub->os_in_prior = 0;
 390         scrub->os_waiting = 0;
 391         scrub->os_paused = 0;
 392         scrub->os_new_checked = 0;
 393         if (sf->sf_pos_last_checkpoint != 0)
 394                 sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
 395         else
 396                 sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
 397
 398         scrub->os_pos_current = sf->sf_pos_latest_start;
 399         sf->sf_status = SS_SCANNING;
 400         sf->sf_time_latest_start = cfs_time_current_sec();
 401         sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
 402         rc = osd_scrub_file_store(scrub);
 403         if (rc == 0) {
 404                 spin_lock(&scrub->os_lock);
 405                 thread_set_flags(thread, SVC_RUNNING);
 406                 spin_unlock(&scrub->os_lock);
 407                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
 408         }
 409         up_write(&scrub->os_rwsem);
 410
 411         RETURN(rc);
 412 }
 413
 414 static int
 415 osd_scrub_check_update(struct osd_thread_info *info, struct osd_device *dev,
 416                        struct osd_idmap_cache *oic, int val)
 417 {
 418         struct osd_scrub             *scrub  = &dev->od_scrub;
 419         struct scrub_file            *sf     = &scrub->os_file;
 420         struct lu_fid                *fid    = &oic->oic_fid;
 421         struct osd_inode_id          *lid    = &oic->oic_lid;
 422         struct osd_inode_id          *lid2   = &info->oti_id;
 423         struct osd_inconsistent_item *oii    = NULL;
 424         struct inode                 *inode  = NULL;
 425         int                           ops    = DTO_INDEX_UPDATE;
 426         int                           idx;
 427         int                           rc;
 428         ENTRY;
 429
 430         down_write(&scrub->os_rwsem);
 431         scrub->os_new_checked++;
 432         if (val < 0)
 433                 GOTO(out, rc = val);
 434
 435         if (scrub->os_in_prior)
 436                 oii = cfs_list_entry(oic, struct osd_inconsistent_item,
 437                                      oii_cache);
 438
 439         if (lid->oii_ino < sf->sf_pos_latest_start && oii == NULL)
 440                 GOTO(out, rc = 0);
 441
 442         if (fid_is_igif(fid))
 443                 sf->sf_items_igif++;
 444
 445         if ((val == SCRUB_NEXT_NOLMA) &&
 446             (!dev->od_handle_nolma || OBD_FAIL_CHECK(OBD_FAIL_FID_NOLMA)))
 447                 GOTO(out, rc = 0);
 448
 449         if ((oii != NULL && oii->oii_insert) || (val == SCRUB_NEXT_NOLMA))
 450                 goto iget;
 451
 452         /* XXX: Currently, no FID-in-LMA for OST object, so osd_oi_lookup()
 453          *      without checking FLD is enough.
 454          *
 455          *      It should be updated if FID-in-LMA for OSD object introduced
 456          *      in the future. */
 457         rc = osd_oi_lookup(info, dev, fid, lid2, false);
 458         if (rc != 0) {
 459                 if (rc != -ENOENT)
 460                         GOTO(out, rc);
 461
 462 iget:
 463                 inode = osd_iget(info, dev, lid);
 464                 if (IS_ERR(inode)) {
 465                         rc = PTR_ERR(inode);
 466                         /* Someone removed the inode. */
 467                         if (rc == -ENOENT || rc == -ESTALE)
 468                                 rc = 0;
 469                         GOTO(out, rc);
 470                 }
 471
 472                 /* Check whether the inode to be unlinked during OI scrub. */
 473                 if (unlikely(inode->i_nlink == 0)) {
 474                         iput(inode);
 475                         GOTO(out, rc = 0);
 476                 }
 477
 478                 ops = DTO_INDEX_INSERT;
 479                 idx = osd_oi_fid2idx(dev, fid);
 480                 if (val == SCRUB_NEXT_NOLMA) {
 481                         sf->sf_flags |= SF_UPGRADE;
 482                         scrub->os_full_speed = 1;
 483                         rc = osd_ea_fid_set(info, inode, fid, 0);
 484                         if (rc != 0)
 485                                 GOTO(out, rc);
 486
 487                         if (!(sf->sf_flags & SF_INCONSISTENT))
 488                                 dev->od_igif_inoi = 0;
 489                 } else {
 490                         sf->sf_flags |= SF_RECREATED;
 491                         scrub->os_full_speed = 1;
 492                         if (unlikely(!ldiskfs_test_bit(idx, sf->sf_oi_bitmap)))
 493                                 ldiskfs_set_bit(idx, sf->sf_oi_bitmap);
 494                 }
 495         } else if (osd_id_eq(lid, lid2)) {
 496                 GOTO(out, rc = 0);
 497         } else {
 498                 sf->sf_flags |= SF_INCONSISTENT;
 499                 scrub->os_full_speed = 1;
 500
 501                 /* XXX: If the device is restored from file-level backup, then
 502                  *      some IGIFs may have been already in OI files, and some
 503                  *      may be not yet. Means upgrading from 1.8 may be partly
 504                  *      processed, but some clients may hold some immobilized
 505                  *      IGIFs, and use them to access related objects. Under
 506                  *      such case, OSD does not know whether an given IGIF has
 507                  *      been processed or to be processed, and it also cannot
 508                  *      generate local ino#/gen# directly from the immobilized
 509                  *      IGIF because of the backup/restore. Then force OSD to
 510                  *      lookup the given IGIF in OI files, and if no entry,
 511                  *      then ask the client to retry after upgrading completed.
 512                  *      No better choice. */
 513                 dev->od_igif_inoi = 1;
 514         }
 515
 516         rc = osd_scrub_refresh_mapping(info, dev, fid, lid, ops);
 517         if (rc == 0) {
 518                 if (scrub->os_in_prior)
 519                         sf->sf_items_updated_prior++;
 520                 else
 521                         sf->sf_items_updated++;
 522         }
 523
 524         GOTO(out, rc);
 525
 526 out:
 527         if (rc < 0) {
 528                 sf->sf_items_failed++;
 529                 if (sf->sf_pos_first_inconsistent == 0 ||
 530                     sf->sf_pos_first_inconsistent > lid->oii_ino)
 531                         sf->sf_pos_first_inconsistent = lid->oii_ino;
 532         } else {
 533                 rc = 0;
 534         }
 535
 536         if (ops == DTO_INDEX_INSERT) {
 537                 /* There may be conflict unlink during the OI scrub,
 538                  * if happend, then remove the new added OI mapping. */
 539                 if (unlikely(inode->i_nlink == 0))
 540                         osd_scrub_refresh_mapping(info, dev, fid, lid,
 541                                                   DTO_INDEX_DELETE);
 542                 iput(inode);
 543         }
 544         up_write(&scrub->os_rwsem);
 545
 546         if (oii != NULL) {
 547                 LASSERT(!cfs_list_empty(&oii->oii_list));
 548
 549                 spin_lock(&scrub->os_lock);
 550                 cfs_list_del_init(&oii->oii_list);
 551                 spin_unlock(&scrub->os_lock);
 552                 OBD_FREE_PTR(oii);
 553         }
 554         RETURN(sf->sf_param & SP_FAILOUT ? rc : 0);
 555 }
 556
 557 static int osd_scrub_checkpoint(struct osd_scrub *scrub)
 558 {
 559         struct scrub_file *sf = &scrub->os_file;
 560         int                rc;
 561
 562         if (likely(cfs_time_before(cfs_time_current(),
 563                                    scrub->os_time_next_checkpoint) ||
 564                    scrub->os_new_checked == 0))
 565                 return 0;
 566
 567         down_write(&scrub->os_rwsem);
 568         sf->sf_items_checked += scrub->os_new_checked;
 569         scrub->os_new_checked = 0;
 570         sf->sf_pos_last_checkpoint = scrub->os_pos_current;
 571         sf->sf_time_last_checkpoint = cfs_time_current_sec();
 572         sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
 573                                             scrub->os_time_last_checkpoint);
 574         rc = osd_scrub_file_store(scrub);
 575         up_write(&scrub->os_rwsem);
 576
 577         return rc;
 578 }
 579
 580 static void osd_scrub_post(struct osd_scrub *scrub, int result)
 581 {
 582         struct scrub_file *sf = &scrub->os_file;
 583         ENTRY;
 584
 585         down_write(&scrub->os_rwsem);
 586         spin_lock(&scrub->os_lock);
 587         thread_set_flags(&scrub->os_thread, SVC_STOPPING);
 588         spin_unlock(&scrub->os_lock);
 589         if (scrub->os_new_checked > 0) {
 590                 sf->sf_items_checked += scrub->os_new_checked;
 591                 scrub->os_new_checked = 0;
 592                 sf->sf_pos_last_checkpoint = scrub->os_pos_current;
 593         }
 594         sf->sf_time_last_checkpoint = cfs_time_current_sec();
 595         if (result > 0) {
 596                 struct osd_device *dev =
 597                         container_of0(scrub, struct osd_device, od_scrub);
 598
 599                 dev->od_igif_inoi = 1;
 600                 sf->sf_status = SS_COMPLETED;
 601                 memset(sf->sf_oi_bitmap, 0, SCRUB_OI_BITMAP_SIZE);
 602                 sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
 603                                   SF_UPGRADE | SF_AUTO);
 604                 sf->sf_time_last_complete = sf->sf_time_last_checkpoint;
 605                 sf->sf_success_count++;
 606         } else if (result == 0) {
 607                 if (scrub->os_paused)
 608                         sf->sf_status = SS_PAUSED;
 609                 else
 610                         sf->sf_status = SS_STOPPED;
 611         } else {
 612                 sf->sf_status = SS_FAILED;
 613         }
 614         sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
 615                                             scrub->os_time_last_checkpoint);
 616         result = osd_scrub_file_store(scrub);
 617         if (result < 0)
 618                 CERROR("%.16s: fail to osd_scrub_post, rc = %d\n",
 619                        LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,
 620                        result);
 621         up_write(&scrub->os_rwsem);
 622
 623         EXIT;
 624 }
 625
 626 /* iteration engine */
 627
 628 struct osd_iit_param {
 629         struct super_block *sb;
 630         struct buffer_head *bitmap;
 631         ldiskfs_group_t bg;
 632         __u32 gbase;
 633         __u32 offset;
 634 };
 635
 636 typedef int (*osd_iit_next_policy)(struct osd_thread_info *info,
 637                                    struct osd_device *dev,
 638                                    struct osd_iit_param *param,
 639                                    struct osd_idmap_cache **oic,
 640                                    int noslot);
 641
 642 typedef int (*osd_iit_exec_policy)(struct osd_thread_info *info,
 643                                    struct osd_device *dev,
 644                                    struct osd_iit_param *param,
 645                                    struct osd_idmap_cache *oic,
 646                                    int *noslot, int rc);
 647
 648 static int osd_iit_next(struct osd_iit_param *param, __u32 *pos)
 649 {
 650         param->offset = ldiskfs_find_next_bit(param->bitmap->b_data,
 651                         LDISKFS_INODES_PER_GROUP(param->sb), param->offset);
 652         if (param->offset >= LDISKFS_INODES_PER_GROUP(param->sb)) {
 653                 *pos = 1 + (param->bg+1) * LDISKFS_INODES_PER_GROUP(param->sb);
 654                 return SCRUB_NEXT_BREAK;
 655         } else {
 656                 *pos = param->gbase + param->offset;
 657                 return 0;
 658         }
 659 }
 660
 661 static int osd_iit_iget(struct osd_thread_info *info, struct osd_device *dev,
 662                         struct lu_fid *fid, struct osd_inode_id *lid, __u32 pos,
 663                         struct super_block *sb, bool scrub)
 664 {
 665         struct lustre_mdt_attrs *lma   = &info->oti_mdt_attrs;
 666         struct inode            *inode;
 667         int                      rc;
 668
 669         osd_id_gen(lid, pos, OSD_OII_NOGEN);
 670         inode = osd_iget(info, dev, lid);
 671         if (IS_ERR(inode)) {
 672                 rc = PTR_ERR(inode);
 673                 /* The inode may be removed after bitmap searching, or the
 674                  * file is new created without inode initialized yet. */
 675                 if (rc == -ENOENT || rc == -ESTALE)
 676                         return SCRUB_NEXT_CONTINUE;
 677
 678                 CERROR("%.16s: fail to read inode, ino# = %u, rc = %d\n",
 679                        LDISKFS_SB(sb)->s_es->s_volume_name, pos, rc);
 680                 return rc;
 681         }
 682
 683         /* If the inode has no OI mapping, then it is special locally used,
 684          * should be invisible to OI scrub or up layer LFSCK. */
 685         if (ldiskfs_test_inode_state(inode, LDISKFS_STATE_LUSTRE_NO_OI)) {
 686                 iput(inode);
 687                 return SCRUB_NEXT_CONTINUE;
 688         }
 689
 690         if (scrub &&
 691             ldiskfs_test_inode_state(inode, LDISKFS_STATE_LUSTRE_NOSCRUB)) {
 692                 /* Only skip it for the first OI scrub accessing. */
 693                 ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_NOSCRUB);
 694                 iput(inode);
 695                 return SCRUB_NEXT_NOSCRUB;
 696         }
 697
 698         rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
 699         if (rc == 0) {
 700                 if (fid_is_llog(&lma->lma_self_fid) ||
 701                     (!scrub && fid_is_internal(&lma->lma_self_fid)))
 702                         rc = SCRUB_NEXT_CONTINUE;
 703                 else
 704                         *fid = lma->lma_self_fid;
 705         } else if (rc == -ENODATA) {
 706                 lu_igif_build(fid, inode->i_ino, inode->i_generation);
 707                 if (scrub)
 708                         rc = SCRUB_NEXT_NOLMA;
 709                 else
 710                         rc = 0;
 711         }
 712         iput(inode);
 713         return rc;
 714 }
 715
 716 static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
 717                           struct osd_iit_param *param,
 718                           struct osd_idmap_cache **oic, int noslot)
 719 {
 720         struct osd_scrub     *scrub  = &dev->od_scrub;
 721         struct ptlrpc_thread *thread = &scrub->os_thread;
 722         struct lu_fid        *fid;
 723         struct osd_inode_id  *lid;
 724         int                   rc;
 725
 726         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_DELAY) && cfs_fail_val > 0) {
 727                 struct l_wait_info lwi;
 728
 729                 lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val), NULL, NULL);
 730                 l_wait_event(thread->t_ctl_waitq,
 731                              !cfs_list_empty(&scrub->os_inconsistent_items) ||
 732                              !thread_is_running(thread),
 733                              &lwi);
 734         }
 735
 736         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_CRASH)) {
 737                 spin_lock(&scrub->os_lock);
 738                 thread_set_flags(thread, SVC_STOPPING);
 739                 spin_unlock(&scrub->os_lock);
 740                 return SCRUB_NEXT_CRASH;
 741         }
 742
 743         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_FATAL))
 744                 return SCRUB_NEXT_FATAL;
 745
 746         if (unlikely(!thread_is_running(thread)))
 747                 return SCRUB_NEXT_EXIT;
 748
 749         if (!cfs_list_empty(&scrub->os_inconsistent_items)) {
 750                 struct osd_inconsistent_item *oii;
 751
 752                 oii = cfs_list_entry(scrub->os_inconsistent_items.next,
 753                                      struct osd_inconsistent_item, oii_list);
 754                 *oic = &oii->oii_cache;
 755                 scrub->os_in_prior = 1;
 756                 return 0;
 757         }
 758
 759         if (noslot != 0)
 760                 return SCRUB_NEXT_WAIT;
 761
 762         rc = osd_iit_next(param, &scrub->os_pos_current);
 763         if (rc != 0)
 764                 return rc;
 765
 766         *oic = &scrub->os_oic;
 767         fid = &(*oic)->oic_fid;
 768         lid = &(*oic)->oic_lid;
 769         rc = osd_iit_iget(info, dev, fid, lid,
 770                           scrub->os_pos_current, param->sb, true);
 771         return rc;
 772 }
 773
 774 static int osd_preload_next(struct osd_thread_info *info,
 775                             struct osd_device *dev, struct osd_iit_param *param,
 776                             struct osd_idmap_cache **oic, int noslot)
 777 {
 778         struct osd_otable_cache *ooc    = &dev->od_otable_it->ooi_cache;
 779         struct osd_scrub        *scrub;
 780         struct ptlrpc_thread    *thread;
 781         int                      rc;
 782
 783         rc = osd_iit_next(param, &ooc->ooc_pos_preload);
 784         if (rc != 0)
 785                 return rc;
 786
 787         scrub = &dev->od_scrub;
 788         thread = &scrub->os_thread;
 789         if (thread_is_running(thread) &&
 790             ooc->ooc_pos_preload >= scrub->os_pos_current)
 791                 return SCRUB_NEXT_EXIT;
 792
 793         rc = osd_iit_iget(info, dev,
 794                           &ooc->ooc_cache[ooc->ooc_producer_idx].oic_fid,
 795                           &ooc->ooc_cache[ooc->ooc_producer_idx].oic_lid,
 796                           ooc->ooc_pos_preload, param->sb, false);
 797         /* If succeed, it needs to move forward; otherwise up layer LFSCK may
 798          * ignore the failure, so it still need to skip the inode next time. */
 799         ooc->ooc_pos_preload = param->gbase + ++(param->offset);
 800         return rc;
 801 }
 802
 803 static inline int
 804 osd_scrub_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
 805 {
 806         spin_lock(&scrub->os_lock);
 807         if (osd_scrub_has_window(scrub, &it->ooi_cache) ||
 808             !cfs_list_empty(&scrub->os_inconsistent_items) ||
 809             it->ooi_waiting || !thread_is_running(&scrub->os_thread))
 810                 scrub->os_waiting = 0;
 811         else
 812                 scrub->os_waiting = 1;
 813         spin_unlock(&scrub->os_lock);
 814
 815         return !scrub->os_waiting;
 816 }
 817
 818 static int osd_scrub_exec(struct osd_thread_info *info, struct osd_device *dev,
 819                           struct osd_iit_param *param,
 820                           struct osd_idmap_cache *oic, int *noslot, int rc)
 821 {
 822         struct l_wait_info       lwi    = { 0 };
 823         struct osd_scrub        *scrub  = &dev->od_scrub;
 824         struct scrub_file       *sf     = &scrub->os_file;
 825         struct ptlrpc_thread    *thread = &scrub->os_thread;
 826         struct osd_otable_it    *it     = dev->od_otable_it;
 827         struct osd_otable_cache *ooc    = it ? &it->ooi_cache : NULL;
 828
 829         switch (rc) {
 830         case SCRUB_NEXT_CONTINUE:
 831                 goto next;
 832         case SCRUB_NEXT_WAIT:
 833                 goto wait;
 834         case SCRUB_NEXT_NOSCRUB:
 835                 down_write(&scrub->os_rwsem);
 836                 scrub->os_new_checked++;
 837                 sf->sf_items_noscrub++;
 838                 up_write(&scrub->os_rwsem);
 839                 goto next;
 840         }
 841
 842         rc = osd_scrub_check_update(info, dev, oic, rc);
 843         if (rc != 0)
 844                 return rc;
 845
 846         rc = osd_scrub_checkpoint(scrub);
 847         if (rc != 0) {
 848                 CERROR("%.16s: fail to checkpoint, pos = %u, rc = %d\n",
 849                        LDISKFS_SB(param->sb)->s_es->s_volume_name,
 850                        scrub->os_pos_current, rc);
 851                 /* Continue, as long as the scrub itself can go ahead. */
 852         }
 853
 854         if (scrub->os_in_prior) {
 855                 scrub->os_in_prior = 0;
 856                 return 0;
 857         }
 858
 859 next:
 860         scrub->os_pos_current = param->gbase + ++(param->offset);
 861
 862 wait:
 863         if (it != NULL && it->ooi_waiting &&
 864             ooc->ooc_pos_preload < scrub->os_pos_current) {
 865                 spin_lock(&scrub->os_lock);
 866                 it->ooi_waiting = 0;
 867                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
 868                 spin_unlock(&scrub->os_lock);
 869         }
 870
 871         if (scrub->os_full_speed || rc == SCRUB_NEXT_CONTINUE)
 872                 return 0;
 873
 874         if (osd_scrub_has_window(scrub, ooc)) {
 875                 *noslot = 0;
 876                 return 0;
 877         }
 878
 879         l_wait_event(thread->t_ctl_waitq,
 880                      osd_scrub_wakeup(scrub, it),
 881                      &lwi);
 882
 883         if (osd_scrub_has_window(scrub, ooc))
 884                 *noslot = 0;
 885         else
 886                 *noslot = 1;
 887         return 0;
 888 }
 889
 890 static int osd_preload_exec(struct osd_thread_info *info,
 891                             struct osd_device *dev, struct osd_iit_param *param,
 892                             struct osd_idmap_cache *oic, int *noslot, int rc)
 893 {
 894         struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
 895
 896         if (rc == 0) {
 897                 ooc->ooc_cached_items++;
 898                 ooc->ooc_producer_idx = (ooc->ooc_producer_idx + 1) &
 899                                         ~OSD_OTABLE_IT_CACHE_MASK;
 900         }
 901         return rc > 0 ? 0 : rc;
 902 }
 903
 904 #define SCRUB_IT_ALL    1
 905 #define SCRUB_IT_CRASH  2
 906
 907 static int osd_inode_iteration(struct osd_thread_info *info,
 908                                struct osd_device *dev, __u32 max, bool preload)
 909 {
 910         osd_iit_next_policy   next;
 911         osd_iit_exec_policy   exec;
 912         __u32                *pos;
 913         __u32                *count;
 914         struct osd_iit_param  param;
 915         __u32                 limit;
 916         int                   noslot = 0;
 917         int                   rc;
 918         ENTRY;
 919
 920         if (!preload) {
 921                 struct osd_scrub *scrub = &dev->od_scrub;
 922
 923                 next = osd_scrub_next;
 924                 exec = osd_scrub_exec;
 925                 pos = &scrub->os_pos_current;
 926                 count = &scrub->os_new_checked;
 927         } else {
 928                 struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
 929
 930                 next = osd_preload_next;
 931                 exec = osd_preload_exec;
 932                 pos = &ooc->ooc_pos_preload;
 933                 count = &ooc->ooc_cached_items;
 934         }
 935         param.sb = osd_sb(dev);
 936         limit = le32_to_cpu(LDISKFS_SB(param.sb)->s_es->s_inodes_count);
 937
 938         while (*pos <= limit && *count < max) {
 939                 struct osd_idmap_cache *oic = NULL;
 940
 941                 param.bg = (*pos - 1) / LDISKFS_INODES_PER_GROUP(param.sb);
 942                 param.offset = (*pos - 1) % LDISKFS_INODES_PER_GROUP(param.sb);
 943                 param.gbase = 1 + param.bg * LDISKFS_INODES_PER_GROUP(param.sb);
 944                 param.bitmap = ldiskfs_read_inode_bitmap(param.sb, param.bg);
 945                 if (param.bitmap == NULL) {
 946                         CERROR("%.16s: fail to read bitmap for %u, "
 947                                "scrub will stop, urgent mode\n",
 948                                LDISKFS_SB(param.sb)->s_es->s_volume_name,
 949                                (__u32)param.bg);
 950                         RETURN(-EIO);
 951                 }
 952
 953                 while (param.offset < LDISKFS_INODES_PER_GROUP(param.sb) &&
 954                        *count < max) {
 955                         rc = next(info, dev, &param, &oic, noslot);
 956                         switch (rc) {
 957                         case SCRUB_NEXT_BREAK:
 958                                 goto next_group;
 959                         case SCRUB_NEXT_EXIT:
 960                                 brelse(param.bitmap);
 961                                 RETURN(0);
 962                         case SCRUB_NEXT_CRASH:
 963                                 brelse(param.bitmap);
 964                                 RETURN(SCRUB_IT_CRASH);
 965                         case SCRUB_NEXT_FATAL:
 966                                 brelse(param.bitmap);
 967                                 RETURN(-EINVAL);
 968                         }
 969
 970                         rc = exec(info, dev, &param, oic, &noslot, rc);
 971                         if (rc != 0) {
 972                                 brelse(param.bitmap);
 973                                 RETURN(rc);
 974                         }
 975
 976                         if (preload && dev->od_otable_it->ooi_stopping) {
 977                                 brelse(param.bitmap);
 978                                 RETURN(0);
 979                         }
 980                 }
 981
 982 next_group:
 983                 brelse(param.bitmap);
 984
 985                 if (preload && dev->od_otable_it->ooi_stopping)
 986                         RETURN(0);
 987         }
 988
 989         if (*pos > limit)
 990                 RETURN(SCRUB_IT_ALL);
 991         RETURN(0);
 992 }
 993
 994 static int osd_otable_it_preload(const struct lu_env *env,
 995                                  struct osd_otable_it *it)
 996 {
 997         struct osd_device       *dev   = it->ooi_dev;
 998         struct osd_scrub        *scrub = &dev->od_scrub;
 999         struct osd_otable_cache *ooc   = &it->ooi_cache;
1000         int                      rc;
1001         ENTRY;
1002
1003         rc = osd_inode_iteration(osd_oti_get(env), dev,
1004                                  OSD_OTABLE_IT_CACHE_SIZE, true);
1005         if (rc == SCRUB_IT_ALL)
1006                 it->ooi_all_cached = 1;
1007
1008         CDEBUG(D_LFSCK, "OSD pre-loaded: max = %u, preload = %u, rc = %d\n",
1009                le32_to_cpu(LDISKFS_SB(osd_sb(dev))->s_es->s_inodes_count),
1010                ooc->ooc_pos_preload, rc);
1011
1012         if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
1013                 scrub->os_waiting = 0;
1014                 cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
1015         }
1016
1017         RETURN(rc < 0 ? rc : ooc->ooc_cached_items);
1018 }
1019
1020 static int osd_scrub_main(void *args)
1021 {
1022         struct lu_env         env;
1023         struct osd_device    *dev    = (struct osd_device *)args;
1024         struct osd_scrub     *scrub  = &dev->od_scrub;
1025         struct ptlrpc_thread *thread = &scrub->os_thread;
1026         struct super_block   *sb     = osd_sb(dev);
1027         int                   rc;
1028         ENTRY;
1029
1030         cfs_daemonize("OI_scrub");
1031         rc = lu_env_init(&env, LCT_DT_THREAD);
1032         if (rc != 0) {
1033                 CERROR("%.16s: OI scrub, fail to init env, rc = %d\n",
1034                        LDISKFS_SB(sb)->s_es->s_volume_name, rc);
1035                 GOTO(noenv, rc);
1036         }
1037
1038         rc = osd_scrub_prep(dev);
1039         if (rc != 0) {
1040                 CERROR("%.16s: OI scrub, fail to scrub prep, rc = %d\n",
1041                        LDISKFS_SB(sb)->s_es->s_volume_name, rc);
1042                 GOTO(out, rc);
1043         }
1044
1045         if (!scrub->os_full_speed) {
1046                 struct l_wait_info lwi = { 0 };
1047                 struct osd_otable_it *it = dev->od_otable_it;
1048                 struct osd_otable_cache *ooc = &it->ooi_cache;
1049
1050                 l_wait_event(thread->t_ctl_waitq,
1051                              it->ooi_user_ready || !thread_is_running(thread),
1052                              &lwi);
1053                 if (unlikely(!thread_is_running(thread)))
1054                         GOTO(post, rc = 0);
1055
1056                 scrub->os_pos_current = ooc->ooc_pos_preload;
1057         }
1058
1059         CDEBUG(D_LFSCK, "OI scrub: flags = 0x%x, pos = %u\n",
1060                scrub->os_start_flags, scrub->os_pos_current);
1061
1062         rc = osd_inode_iteration(osd_oti_get(&env), dev, ~0U, false);
1063         if (unlikely(rc == SCRUB_IT_CRASH))
1064                 GOTO(out, rc = -EINVAL);
1065         GOTO(post, rc);
1066
1067 post:
1068         osd_scrub_post(scrub, rc);
1069         CDEBUG(D_LFSCK, "OI scrub: stop, rc = %d, pos = %u\n",
1070                rc, scrub->os_pos_current);
1071
1072 out:
1073         while (!cfs_list_empty(&scrub->os_inconsistent_items)) {
1074                 struct osd_inconsistent_item *oii;
1075
1076                 oii = cfs_list_entry(scrub->os_inconsistent_items.next,
1077                                      struct osd_inconsistent_item, oii_list);
1078                 cfs_list_del_init(&oii->oii_list);
1079                 OBD_FREE_PTR(oii);
1080         }
1081         lu_env_fini(&env);
1082
1083 noenv:
1084         spin_lock(&scrub->os_lock);
1085         thread_set_flags(thread, SVC_STOPPED);
1086         cfs_waitq_broadcast(&thread->t_ctl_waitq);
1087         spin_unlock(&scrub->os_lock);
1088         return rc;
1089 }
1090
1091 /* initial OI scrub */
1092
1093 typedef int (*scandir_t)(struct osd_thread_info *, struct osd_device *,
1094                          struct dentry *, filldir_t filldir);
1095
1096 static int osd_ios_varfid_fill(void *buf, const char *name, int namelen,
1097                                loff_t offset, __u64 ino, unsigned d_type);
1098
1099 static int
1100 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
1101                      struct dentry *dentry, filldir_t filldir);
1102 static int
1103 osd_ios_ROOT_scan(struct osd_thread_info *info, struct osd_device *dev,
1104                   struct dentry *dentry, filldir_t filldir);
1105
1106 static int
1107 osd_ios_OBJECTS_scan(struct osd_thread_info *info, struct osd_device *dev,
1108                      struct dentry *dentry, filldir_t filldir);
1109
1110 enum osd_lf_flags {
1111         OLF_SCAN_SUBITEMS       = 0x0001,
1112         OLF_HIDE_FID            = 0x0002,
1113         OLF_SHOW_NAME           = 0x0004,
1114 };
1115
1116 struct osd_lf_map {
1117         char            *olm_name;
1118         struct lu_fid    olm_fid;
1119         __u16            olm_flags;
1120         scandir_t        olm_scandir;
1121         filldir_t        olm_filldir;
1122 };
1123
1124 /* Add the new introduced local files in the list in the future. */
1125 static const struct osd_lf_map osd_lf_maps[] = {
1126         /* CATALOGS */
1127         { CATLIST, { FID_SEQ_LOCAL_FILE, LLOG_CATALOGS_OID, 0 }, OLF_SHOW_NAME,
1128                 NULL, NULL },
1129
1130         /* CONFIGS */
1131         { MOUNT_CONFIGS_DIR, { FID_SEQ_LOCAL_FILE, MGS_CONFIGS_OID, 0 },
1132                 OLF_SCAN_SUBITEMS, osd_ios_general_scan,
1133                 osd_ios_varfid_fill },
1134
1135         /* NIDTBL_VERSIONS */
1136         { MGS_NIDTBL_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
1137                 osd_ios_general_scan, osd_ios_varfid_fill },
1138
1139         /* PENDING */
1140         { "PENDING", { FID_SEQ_LOCAL_FILE, MDD_ORPHAN_OID, 0 }, 0, NULL, NULL },
1141
1142         /* ROOT */
1143         { "ROOT", { FID_SEQ_ROOT, 1, 0 },
1144                 OLF_SCAN_SUBITEMS | OLF_HIDE_FID, osd_ios_ROOT_scan, NULL },
1145
1146         /* changelog_catalog */
1147         { CHANGELOG_CATALOG, { 0, 0, 0 }, 0, NULL, NULL },
1148
1149         /* changelog_users */
1150         { CHANGELOG_USERS, { 0, 0, 0 }, 0, NULL, NULL },
1151
1152         /* fld */
1153         { "fld", { FID_SEQ_LOCAL_FILE, FLD_INDEX_OID, 0 }, OLF_SHOW_NAME,
1154                 NULL, NULL },
1155
1156         /* last_rcvd */
1157         { LAST_RCVD, { FID_SEQ_LOCAL_FILE, LAST_RECV_OID, 0 }, OLF_SHOW_NAME,
1158                 NULL, NULL },
1159
1160         /* lfsck_bookmark */
1161         { "lfsck_bookmark", { FID_SEQ_LOCAL_FILE, LFSCK_BOOKMARK_OID, 0 }, 0,
1162                 NULL, NULL },
1163
1164         /* lov_objid */
1165         { LOV_OBJID, { FID_SEQ_LOCAL_FILE, MDD_LOV_OBJ_OID, 0 }, OLF_SHOW_NAME,
1166                 NULL, NULL },
1167
1168         /* lov_objseq */
1169         { LOV_OBJSEQ, { FID_SEQ_LOCAL_FILE, MDD_LOV_OBJ_OSEQ, 0 },
1170                 OLF_SHOW_NAME, NULL, NULL },
1171
1172         /* quota_master */
1173         { QMT_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
1174                 osd_ios_general_scan, osd_ios_varfid_fill },
1175
1176         /* quota_slave */
1177         { QSD_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
1178                 osd_ios_general_scan, osd_ios_varfid_fill },
1179
1180         /* seq-200000003-lastid */
1181         { "seq-200000003-lastid", { FID_SEQ_LOCAL_NAME, 1, 0 }, 0,
1182                 NULL, NULL },
1183
1184         /* seq_ctl */
1185         { "seq_ctl", { FID_SEQ_LOCAL_FILE, FID_SEQ_CTL_OID, 0 },
1186                 OLF_SHOW_NAME, NULL, NULL },
1187
1188         /* seq_srv */
1189         { "seq_srv", { FID_SEQ_LOCAL_FILE, FID_SEQ_SRV_OID, 0 },
1190                 OLF_SHOW_NAME, NULL, NULL },
1191
1192         /* LAST_GROUP */
1193         { "LAST_GROUP", { FID_SEQ_LOCAL_FILE, OFD_LAST_GROUP_OID, 0 },
1194                 OLF_SHOW_NAME, NULL, NULL },
1195
1196         /* health_check */
1197         { HEALTH_CHECK, { FID_SEQ_LOCAL_FILE, OFD_HEALTH_CHECK_OID, 0 },
1198                 OLF_SHOW_NAME, NULL, NULL },
1199
1200         /* lfsck_namespace */
1201         { "lfsck_namespace", { FID_SEQ_LOCAL_FILE, LFSCK_BOOKMARK_OID, 0 }, 0,
1202                 NULL, NULL },
1203
1204         /* OBJECTS, upgrade from old device */
1205         { OBJECTS, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, osd_ios_OBJECTS_scan, NULL },
1206
1207         /* lquota_v2.user, upgrade from old device */
1208         { "lquota_v2.user", { 0, 0, 0 }, 0, NULL, NULL },
1209
1210         /* lquota_v2.group, upgrade from old device */
1211         { "lquota_v2.group", { 0, 0, 0 }, 0, NULL, NULL },
1212
1213         { NULL, { 0, 0, 0 }, 0, NULL, NULL }
1214 };
1215
1216 struct osd_ios_item {
1217         cfs_list_t       oii_list;
1218         struct dentry   *oii_dentry;
1219         scandir_t        oii_scandir;
1220         filldir_t        oii_filldir;
1221 };
1222
1223 struct osd_ios_filldir_buf {
1224         struct osd_thread_info  *oifb_info;
1225         struct osd_device       *oifb_dev;
1226         struct dentry           *oifb_dentry;
1227 };
1228
1229 static inline struct dentry *
1230 osd_ios_lookup_one_len(const char *name, struct dentry *parent, int namelen)
1231 {
1232         struct dentry *dentry;
1233
1234         dentry = ll_lookup_one_len(name, parent, namelen);
1235         if (!IS_ERR(dentry) && dentry->d_inode == NULL) {
1236                 dput(dentry);
1237                 return ERR_PTR(-ENOENT);
1238         }
1239
1240         return dentry;
1241 }
1242
1243 static inline void
1244 osd_ios_llogname2fid(struct lu_fid *fid, const char *name, int namelen)
1245 {
1246         obd_id id = 0;
1247         int    i  = 0;
1248
1249         fid->f_seq = FID_SEQ_LLOG;
1250         while (i < namelen)
1251                 id = id * 10 + name[i++] - '0';
1252
1253         fid->f_oid = id & 0x00000000ffffffffULL;
1254         fid->f_ver = id >> 32;
1255 }
1256
1257 static inline void
1258 osd_ios_Oname2fid(struct lu_fid *fid, const char *name, int namelen)
1259 {
1260         __u64 seq = 0;
1261         int   i   = 0;
1262
1263         while (i < namelen)
1264                 seq = seq * 10 + name[i++] - '0';
1265
1266         lu_last_id_fid(fid, seq);
1267 }
1268
1269 static int
1270 osd_ios_new_item(struct osd_device *dev, struct dentry *dentry,
1271                  scandir_t scandir, filldir_t filldir)
1272 {
1273         struct osd_ios_item *item;
1274
1275         OBD_ALLOC_PTR(item);
1276         if (item == NULL)
1277                 return -ENOMEM;
1278
1279         CFS_INIT_LIST_HEAD(&item->oii_list);
1280         item->oii_dentry = dget(dentry);
1281         item->oii_scandir = scandir;
1282         item->oii_filldir = filldir;
1283         cfs_list_add_tail(&item->oii_list, &dev->od_ios_list);
1284         return 0;
1285 }
1286
1287 /**
1288  * osd_ios_scan_one() - check/fix LMA FID and OI entry for one inode
1289  *
1290  * The passed \a inode's \a fid is verified against the LMA FID. If the \a fid
1291  * is NULL or is empty the IGIF FID is used. The FID is verified in the OI to
1292  * reference the inode, or fixed if it is missing or references another inode.
1293  */
1294 static int
1295 osd_ios_scan_one(struct osd_thread_info *info, struct osd_device *dev,
1296                  struct inode *inode, const struct lu_fid *fid, int flags)
1297 {
1298         struct lustre_mdt_attrs *lma    = &info->oti_mdt_attrs;
1299         struct osd_inode_id     *id     = &info->oti_id;
1300         struct osd_inode_id     *id2    = &info->oti_id2;
1301         struct osd_scrub        *scrub  = &dev->od_scrub;
1302         struct scrub_file       *sf     = &scrub->os_file;
1303         struct lu_fid            tfid;
1304         int                      rc;
1305         ENTRY;
1306
1307         rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
1308         if (rc != 0 && rc != -ENODATA)
1309                 RETURN(rc);
1310
1311         osd_id_gen(id, inode->i_ino, inode->i_generation);
1312         if (rc == -ENODATA) {
1313                 if (fid == NULL || fid_is_zero(fid) || flags & OLF_HIDE_FID)
1314                         lu_igif_build(&tfid, inode->i_ino, inode->i_generation);
1315                 else
1316                         tfid = *fid;
1317                 rc = osd_ea_fid_set(info, inode, &tfid, 0);
1318                 if (rc != 0)
1319                         RETURN(rc);
1320         } else {
1321                 tfid = lma->lma_self_fid;
1322         }
1323
1324         rc = __osd_oi_lookup(info, dev, &tfid, id2);
1325         if (rc != 0) {
1326                 if (rc != -ENOENT)
1327                         RETURN(rc);
1328
1329                 rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
1330                                                DTO_INDEX_INSERT);
1331                 RETURN(rc);
1332         }
1333
1334         if (osd_id_eq_strict(id, id2))
1335                 RETURN(0);
1336
1337         if (!(sf->sf_flags & SF_INCONSISTENT)) {
1338                 osd_scrub_file_reset(scrub,
1339                                      LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
1340                                      SF_INCONSISTENT);
1341                 rc = osd_scrub_file_store(scrub);
1342                 if (rc != 0)
1343                         RETURN(rc);
1344         }
1345
1346         rc = osd_scrub_refresh_mapping(info, dev, &tfid, id, DTO_INDEX_UPDATE);
1347
1348         RETURN(rc);
1349 }
1350
1351 static int osd_ios_varfid_fill(void *buf, const char *name, int namelen,
1352                                loff_t offset, __u64 ino, unsigned d_type)
1353 {
1354         struct osd_ios_filldir_buf *fill_buf = buf;
1355         struct osd_device          *dev      = fill_buf->oifb_dev;
1356         struct dentry              *child;
1357         int                         rc;
1358         ENTRY;
1359
1360         /* skip any '.' started names */
1361         if (name[0] == '.')
1362                 RETURN(0);
1363
1364         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
1365         if (IS_ERR(child))
1366                 RETURN(PTR_ERR(child));
1367
1368         rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
1369                               NULL, 0);
1370         if (rc == 0 && S_ISDIR(child->d_inode->i_mode))
1371                 rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
1372                                       osd_ios_varfid_fill);
1373         dput(child);
1374
1375         RETURN(rc);
1376 }
1377
1378 static int osd_ios_root_fill(void *buf, const char *name, int namelen,
1379                              loff_t offset, __u64 ino, unsigned d_type)
1380 {
1381         struct osd_ios_filldir_buf *fill_buf = buf;
1382         struct osd_device          *dev      = fill_buf->oifb_dev;
1383         const struct osd_lf_map    *map;
1384         struct dentry              *child;
1385         int                         rc       = 0;
1386         ENTRY;
1387
1388         /* skip any '.' started names */
1389         if (name[0] == '.')
1390                 RETURN(0);
1391
1392         for (map = osd_lf_maps; map->olm_name != NULL; map++) {
1393                 if (strlen(map->olm_name) != namelen)
1394                         continue;
1395
1396                 if (strncmp(map->olm_name, name, namelen) == 0)
1397                         break;
1398         }
1399
1400         if (map->olm_name == NULL)
1401                 RETURN(0);
1402
1403         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
1404         if (IS_ERR(child))
1405                 RETURN(PTR_ERR(child));
1406
1407         rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
1408                               &map->olm_fid, map->olm_flags);
1409         if (rc == 0 && map->olm_flags & OLF_SCAN_SUBITEMS)
1410                 rc = osd_ios_new_item(dev, child, map->olm_scandir,
1411                                       map->olm_filldir);
1412         dput(child);
1413
1414         RETURN(rc);
1415 }
1416
1417 static int
1418 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
1419                      struct dentry *dentry, filldir_t filldir)
1420 {
1421         struct osd_ios_filldir_buf    buf   = { info, dev, dentry };
1422         struct file                  *filp  = &info->oti_it_ea.oie_file;
1423         struct inode                 *inode = dentry->d_inode;
1424         const struct file_operations *fops  = inode->i_fop;
1425         int                           rc;
1426         ENTRY;
1427
1428         LASSERT(filldir != NULL);
1429
1430         filp->f_pos = 0;
1431         filp->f_dentry = dentry;
1432         filp->f_mode = FMODE_64BITHASH;
1433         filp->f_mapping = inode->i_mapping;
1434         filp->f_op = fops;
1435         filp->private_data = NULL;
1436
1437         rc = fops->readdir(filp, &buf, filldir);
1438         fops->release(inode, filp);
1439
1440         RETURN(rc);
1441 }
1442
1443 static int
1444 osd_ios_ROOT_scan(struct osd_thread_info *info, struct osd_device *dev,
1445                   struct dentry *dentry, filldir_t filldir)
1446 {
1447         struct osd_scrub  *scrub  = &dev->od_scrub;
1448         struct scrub_file *sf     = &scrub->os_file;
1449         struct dentry     *child;
1450         int                rc;
1451         ENTRY;
1452
1453         /* It is existing MDT device. */
1454         dev->od_handle_nolma = 1;
1455         child = osd_ios_lookup_one_len(dot_lustre_name, dentry,
1456                                        strlen(dot_lustre_name));
1457         if (IS_ERR(child)) {
1458                 rc = PTR_ERR(child);
1459                 if (rc == -ENOENT) {
1460                         /* It is 1.8 MDT device. */
1461                         if (!(sf->sf_flags & SF_UPGRADE)) {
1462                                 osd_scrub_file_reset(scrub,
1463                                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
1464                                         SF_UPGRADE);
1465                                 rc = osd_scrub_file_store(scrub);
1466                         } else {
1467                                 rc = 0;
1468                         }
1469                 }
1470         } else {
1471                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
1472                 dput(child);
1473         }
1474
1475         RETURN(rc);
1476 }
1477
1478 static int
1479 osd_ios_OBJECTS_scan(struct osd_thread_info *info, struct osd_device *dev,
1480                      struct dentry *dentry, filldir_t filldir)
1481 {
1482         struct dentry *child;
1483         int            rc;
1484         ENTRY;
1485
1486         child = osd_ios_lookup_one_len(ADMIN_USR, dentry, strlen(ADMIN_USR));
1487         if (!IS_ERR(child)) {
1488                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
1489                 dput(child);
1490         } else {
1491                 rc = PTR_ERR(child);
1492         }
1493
1494         if (rc != 0 && rc != -ENOENT)
1495                 RETURN(rc);
1496
1497         child = osd_ios_lookup_one_len(ADMIN_GRP, dentry, strlen(ADMIN_GRP));
1498         if (!IS_ERR(child)) {
1499                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
1500                 dput(child);
1501         } else {
1502                 rc = PTR_ERR(child);
1503         }
1504
1505         if (rc == -ENOENT)
1506                 rc = 0;
1507
1508         RETURN(rc);
1509 }
1510
1511 static int osd_initial_OI_scrub(struct osd_thread_info *info,
1512                                 struct osd_device *dev)
1513 {
1514         struct osd_ios_item *item    = NULL;
1515         scandir_t            scandir = osd_ios_general_scan;
1516         filldir_t            filldir = osd_ios_root_fill;
1517         struct dentry       *dentry  = osd_sb(dev)->s_root;
1518         int                  rc;
1519         ENTRY;
1520
1521         while (1) {
1522                 rc = scandir(info, dev, dentry, filldir);
1523                 if (item != NULL) {
1524                         dput(item->oii_dentry);
1525                         OBD_FREE_PTR(item);
1526                 }
1527
1528                 if (rc != 0)
1529                         break;
1530
1531                 if (cfs_list_empty(&dev->od_ios_list))
1532                         break;
1533
1534                 item = cfs_list_entry(dev->od_ios_list.next,
1535                                       struct osd_ios_item, oii_list);
1536                 cfs_list_del_init(&item->oii_list);
1537
1538                 LASSERT(item->oii_scandir != NULL);
1539                 scandir = item->oii_scandir;
1540                 filldir = item->oii_filldir;
1541                 dentry = item->oii_dentry;
1542         }
1543
1544         while (!cfs_list_empty(&dev->od_ios_list)) {
1545                 item = cfs_list_entry(dev->od_ios_list.next,
1546                                       struct osd_ios_item, oii_list);
1547                 cfs_list_del_init(&item->oii_list);
1548                 dput(item->oii_dentry);
1549                 OBD_FREE_PTR(item);
1550         }
1551
1552         RETURN(rc);
1553 }
1554
1555 char *osd_lf_fid2name(const struct lu_fid *fid)
1556 {
1557         const struct osd_lf_map *map = osd_lf_maps;
1558
1559         while (map->olm_name != NULL) {
1560                 if (!lu_fid_eq(fid, &map->olm_fid)) {
1561                         map++;
1562                         continue;
1563                 }
1564
1565                 if (map->olm_flags & OLF_SHOW_NAME)
1566                         return map->olm_name;
1567                 else
1568                         return "";
1569         }
1570
1571         return NULL;
1572 }
1573
1574 /* OI scrub start/stop */
1575
1576 static int do_osd_scrub_start(struct osd_device *dev, __u32 flags)
1577 {
1578         struct osd_scrub     *scrub  = &dev->od_scrub;
1579         struct ptlrpc_thread *thread = &scrub->os_thread;
1580         struct l_wait_info    lwi    = { 0 };
1581         int                   rc;
1582         ENTRY;
1583
1584 again:
1585         /* os_lock: sync status between stop and scrub thread */
1586         spin_lock(&scrub->os_lock);
1587         if (thread_is_running(thread)) {
1588                 spin_unlock(&scrub->os_lock);
1589                 RETURN(-EALREADY);
1590         } else if (unlikely(thread_is_stopping(thread))) {
1591                 spin_unlock(&scrub->os_lock);
1592                 l_wait_event(thread->t_ctl_waitq,
1593                              thread_is_stopped(thread),
1594                              &lwi);
1595                 goto again;
1596         }
1597         spin_unlock(&scrub->os_lock);
1598
1599         if (scrub->os_file.sf_status == SS_COMPLETED)
1600                 flags |= SS_RESET;
1601
1602         scrub->os_start_flags = flags;
1603         thread_set_flags(thread, 0);
1604         rc = cfs_create_thread(osd_scrub_main, dev, 0);
1605         if (rc < 0) {
1606                 CERROR("%.16s: cannot start iteration thread, rc = %d\n",
1607                        LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name, rc);
1608                 RETURN(rc);
1609         }
1610
1611         l_wait_event(thread->t_ctl_waitq,
1612                      thread_is_running(thread) || thread_is_stopped(thread),
1613                      &lwi);
1614
1615         RETURN(0);
1616 }
1617
1618 int osd_scrub_start(struct osd_device *dev)
1619 {
1620         int rc;
1621         ENTRY;
1622
1623         /* od_otable_mutex: prevent curcurrent start/stop */
1624         mutex_lock(&dev->od_otable_mutex);
1625         rc = do_osd_scrub_start(dev, SS_AUTO);
1626         mutex_unlock(&dev->od_otable_mutex);
1627
1628         RETURN(rc == -EALREADY ? 0 : rc);
1629 }
1630
1631 static void do_osd_scrub_stop(struct osd_scrub *scrub)
1632 {
1633         struct ptlrpc_thread *thread = &scrub->os_thread;
1634         struct l_wait_info    lwi    = { 0 };
1635
1636         /* os_lock: sync status between stop and scrub thread */
1637         spin_lock(&scrub->os_lock);
1638         if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
1639                 thread_set_flags(thread, SVC_STOPPING);
1640                 spin_unlock(&scrub->os_lock);
1641                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
1642                 l_wait_event(thread->t_ctl_waitq,
1643                              thread_is_stopped(thread),
1644                              &lwi);
1645                 /* Do not skip the last lock/unlock, which can guarantee that
1646                  * the caller cannot return until the OI scrub thread exit. */
1647                 spin_lock(&scrub->os_lock);
1648         }
1649         spin_unlock(&scrub->os_lock);
1650 }
1651
1652 static void osd_scrub_stop(struct osd_device *dev)
1653 {
1654         /* od_otable_mutex: prevent curcurrent start/stop */
1655         mutex_lock(&dev->od_otable_mutex);
1656         dev->od_scrub.os_paused = 1;
1657         do_osd_scrub_stop(&dev->od_scrub);
1658         mutex_unlock(&dev->od_otable_mutex);
1659 }
1660
1661 /* OI scrub setup/cleanup */
1662
1663 static const char osd_scrub_name[] = "OI_scrub";
1664
1665 int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
1666 {
1667         struct osd_thread_info     *info   = osd_oti_get(env);
1668         struct osd_scrub           *scrub  = &dev->od_scrub;
1669         struct lvfs_run_ctxt       *ctxt   = &scrub->os_ctxt;
1670         struct scrub_file          *sf     = &scrub->os_file;
1671         struct super_block         *sb     = osd_sb(dev);
1672         struct ldiskfs_super_block *es     = LDISKFS_SB(sb)->s_es;
1673         struct lvfs_run_ctxt        saved;
1674         struct file                *filp;
1675         int                         dirty  = 0;
1676         int                         rc     = 0;
1677         ENTRY;
1678
1679         memset(scrub, 0, sizeof(*scrub));
1680         OBD_SET_CTXT_MAGIC(ctxt);
1681         ctxt->pwdmnt = dev->od_mnt;
1682         ctxt->pwd = dev->od_mnt->mnt_root;
1683         ctxt->fs = get_ds();
1684
1685         cfs_waitq_init(&scrub->os_thread.t_ctl_waitq);
1686         init_rwsem(&scrub->os_rwsem);
1687         spin_lock_init(&scrub->os_lock);
1688         CFS_INIT_LIST_HEAD(&scrub->os_inconsistent_items);
1689
1690         push_ctxt(&saved, ctxt, NULL);
1691         filp = filp_open(osd_scrub_name, O_RDWR | O_CREAT, 0644);
1692         if (IS_ERR(filp))
1693                 RETURN(PTR_ERR(filp));
1694
1695         scrub->os_inode = igrab(filp->f_dentry->d_inode);
1696         filp_close(filp, 0);
1697         pop_ctxt(&saved, ctxt, NULL);
1698         ldiskfs_set_inode_state(scrub->os_inode,
1699                                 LDISKFS_STATE_LUSTRE_NO_OI);
1700
1701         rc = osd_scrub_file_load(scrub);
1702         if (rc == -ENOENT) {
1703                 osd_scrub_file_init(scrub, es->s_uuid);
1704                 dirty = 1;
1705         } else if (rc != 0) {
1706                 RETURN(rc);
1707         } else {
1708                 if (memcmp(sf->sf_uuid, es->s_uuid, 16) != 0) {
1709                         osd_scrub_file_reset(scrub, es->s_uuid,SF_INCONSISTENT);
1710                         dirty = 1;
1711                 } else if (sf->sf_status == SS_SCANNING) {
1712                         sf->sf_status = SS_CRASHED;
1713                         dirty = 1;
1714                 }
1715         }
1716
1717         if (sf->sf_pos_last_checkpoint != 0)
1718                 scrub->os_pos_current = sf->sf_pos_last_checkpoint + 1;
1719         else
1720                 scrub->os_pos_current = LDISKFS_FIRST_INO(sb) + 1;
1721
1722         if (dirty != 0) {
1723                 rc = osd_scrub_file_store(scrub);
1724                 if (rc != 0)
1725                         RETURN(rc);
1726         }
1727
1728         /* Initialize OI files. */
1729         rc = osd_oi_init(info, dev);
1730         if (rc < 0)
1731                 RETURN(rc);
1732
1733         rc = osd_initial_OI_scrub(info, dev);
1734         if (rc == 0) {
1735                 if ((sf->sf_flags & SF_UPGRADE) &&
1736                    !(sf->sf_flags & SF_INCONSISTENT))
1737                         /* The 'od_igif_inoi' will be set after the
1738                          * upgrading completed, needs NOT remount. */
1739                         dev->od_igif_inoi = 0;
1740                 else
1741                         /* The 'od_igif_inoi' will be set under the
1742                          * following cases:
1743                          * 1) new created system, or
1744                          * 2) restored from file-level backup, or
1745                          * 3) the upgrading completed.
1746                          *
1747                          * The 'od_igif_inoi' may be cleared by OI scrub
1748                          * later if found that the system is upgrading. */
1749                         dev->od_igif_inoi = 1;
1750
1751                 if (!dev->od_noscrub &&
1752                     ((sf->sf_status == SS_PAUSED) ||
1753                      (sf->sf_status == SS_CRASHED &&
1754                       sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
1755                                       SF_UPGRADE | SF_AUTO)) ||
1756                      (sf->sf_status == SS_INIT &&
1757                       sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
1758                                       SF_UPGRADE))))
1759                         rc = osd_scrub_start(dev);
1760         }
1761
1762         RETURN(rc);
1763 }
1764
1765 void osd_scrub_cleanup(const struct lu_env *env, struct osd_device *dev)
1766 {
1767         struct osd_scrub *scrub = &dev->od_scrub;
1768
1769         LASSERT(dev->od_otable_it == NULL);
1770
1771         if (scrub->os_inode != NULL) {
1772                 osd_scrub_stop(dev);
1773                 iput(scrub->os_inode);
1774                 scrub->os_inode = NULL;
1775         }
1776         if (dev->od_oi_table != NULL)
1777                 osd_oi_fini(osd_oti_get(env), dev);
1778 }
1779
1780 /* object table based iteration APIs */
1781
1782 static struct dt_it *osd_otable_it_init(const struct lu_env *env,
1783                                        struct dt_object *dt, __u32 attr,
1784                                        struct lustre_capa *capa)
1785 {
1786         enum dt_otable_it_flags flags = attr >> DT_OTABLE_IT_FLAGS_SHIFT;
1787         enum dt_otable_it_valid valid = attr & ~DT_OTABLE_IT_FLAGS_MASK;
1788         struct osd_device      *dev   = osd_dev(dt->do_lu.lo_dev);
1789         struct osd_scrub       *scrub = &dev->od_scrub;
1790         struct osd_otable_it   *it;
1791         __u32                   start = 0;
1792         int                     rc;
1793         ENTRY;
1794
1795         /* od_otable_mutex: prevent curcurrent init/fini */
1796         mutex_lock(&dev->od_otable_mutex);
1797         if (dev->od_otable_it != NULL)
1798                 GOTO(out, it = ERR_PTR(-EALREADY));
1799
1800         OBD_ALLOC_PTR(it);
1801         if (it == NULL)
1802                 GOTO(out, it = ERR_PTR(-ENOMEM));
1803
1804         dev->od_otable_it = it;
1805         it->ooi_dev = dev;
1806         it->ooi_pid = cfs_curproc_pid();
1807         it->ooi_cache.ooc_consumer_idx = -1;
1808         if (flags & DOIF_OUTUSED)
1809                 it->ooi_used_outside = 1;
1810
1811         if (flags & DOIF_RESET)
1812                 start |= SS_RESET;
1813
1814         if (valid & DOIV_ERROR_HANDLE) {
1815                 if (flags & DOIF_FAILOUT)
1816                         start |= SS_SET_FAILOUT;
1817                 else
1818                         start |= SS_CLEAR_FAILOUT;
1819         }
1820
1821         rc = do_osd_scrub_start(dev, start);
1822         if (rc < 0 && rc != -EALREADY) {
1823                 dev->od_otable_it = NULL;
1824                 OBD_FREE_PTR(it);
1825                 GOTO(out, it = ERR_PTR(rc));
1826         }
1827
1828         it->ooi_cache.ooc_pos_preload = scrub->os_pos_current;
1829
1830         GOTO(out, it);
1831
1832 out:
1833         mutex_unlock(&dev->od_otable_mutex);
1834         return (struct dt_it *)it;
1835 }
1836
1837 static void osd_otable_it_fini(const struct lu_env *env, struct dt_it *di)
1838 {
1839         struct osd_otable_it *it  = (struct osd_otable_it *)di;
1840         struct osd_device    *dev = it->ooi_dev;
1841
1842         /* od_otable_mutex: prevent curcurrent init/fini */
1843         mutex_lock(&dev->od_otable_mutex);
1844         do_osd_scrub_stop(&dev->od_scrub);
1845         LASSERT(dev->od_otable_it == it);
1846
1847         dev->od_otable_it = NULL;
1848         mutex_unlock(&dev->od_otable_mutex);
1849         OBD_FREE_PTR(it);
1850 }
1851
1852 static int osd_otable_it_get(const struct lu_env *env,
1853                              struct dt_it *di, const struct dt_key *key)
1854 {
1855         return 0;
1856 }
1857
1858 /**
1859  * It is hack here:
1860  *
1861  * Sometimes the otable-based iteration driver (LFSCK) may be blocked in OSD
1862  * layer when someone wants to stop/pause the iteration. Under such case, we
1863  * need some mechanism to notify the event and wakeup the blocker.
1864  */
1865 static void osd_otable_it_put(const struct lu_env *env, struct dt_it *di)
1866 {
1867         struct osd_otable_it *it  = (struct osd_otable_it *)di;
1868         struct osd_device    *dev = it->ooi_dev;
1869
1870         /* od_otable_mutex: prevent curcurrent init/fini */
1871         mutex_lock(&dev->od_otable_mutex);
1872         if (it->ooi_pid == cfs_curproc_pid()) {
1873                 dev->od_scrub.os_paused = 1;
1874         } else {
1875                 struct ptlrpc_thread *thread = &dev->od_scrub.os_thread;
1876
1877                 it->ooi_stopping = 1;
1878                 if (it->ooi_waiting)
1879                         cfs_waitq_broadcast(&thread->t_ctl_waitq);
1880         }
1881         mutex_unlock(&dev->od_otable_mutex);
1882 }
1883
1884 static inline int
1885 osd_otable_it_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
1886 {
1887         spin_lock(&scrub->os_lock);
1888         if (it->ooi_cache.ooc_pos_preload < scrub->os_pos_current ||
1889             scrub->os_waiting || it->ooi_stopping ||
1890             !thread_is_running(&scrub->os_thread))
1891                 it->ooi_waiting = 0;
1892         else
1893                 it->ooi_waiting = 1;
1894         spin_unlock(&scrub->os_lock);
1895
1896         return !it->ooi_waiting;
1897 }
1898
1899 static int osd_otable_it_next(const struct lu_env *env, struct dt_it *di)
1900 {
1901         struct osd_otable_it    *it     = (struct osd_otable_it *)di;
1902         struct osd_device       *dev    = it->ooi_dev;
1903         struct osd_scrub        *scrub  = &dev->od_scrub;
1904         struct osd_otable_cache *ooc    = &it->ooi_cache;
1905         struct ptlrpc_thread    *thread = &scrub->os_thread;
1906         struct l_wait_info       lwi    = { 0 };
1907         int                      rc;
1908         ENTRY;
1909
1910         LASSERT(it->ooi_user_ready);
1911
1912 again:
1913         if (!thread_is_running(thread) && !it->ooi_used_outside)
1914                 RETURN(1);
1915
1916         if (ooc->ooc_cached_items > 0) {
1917                 ooc->ooc_cached_items--;
1918                 ooc->ooc_consumer_idx = (ooc->ooc_consumer_idx + 1) &
1919                                         ~OSD_OTABLE_IT_CACHE_MASK;
1920                 RETURN(0);
1921         }
1922
1923         if (it->ooi_all_cached) {
1924                 l_wait_event(thread->t_ctl_waitq,
1925                              !thread_is_running(thread),
1926                              &lwi);
1927                 RETURN(1);
1928         }
1929
1930         if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
1931                 spin_lock(&scrub->os_lock);
1932                 scrub->os_waiting = 0;
1933                 cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
1934                 spin_unlock(&scrub->os_lock);
1935         }
1936
1937         if (it->ooi_cache.ooc_pos_preload >= scrub->os_pos_current)
1938                 l_wait_event(thread->t_ctl_waitq,
1939                              osd_otable_it_wakeup(scrub, it),
1940                              &lwi);
1941
1942         if (!thread_is_running(thread) && !it->ooi_used_outside)
1943                 RETURN(1);
1944
1945         if (it->ooi_stopping)
1946                 RETURN(0);
1947
1948         rc = osd_otable_it_preload(env, it);
1949         if (rc >= 0)
1950                 goto again;
1951
1952         RETURN(rc);
1953 }
1954
1955 static struct dt_key *osd_otable_it_key(const struct lu_env *env,
1956                                         const struct dt_it *di)
1957 {
1958         return NULL;
1959 }
1960
1961 static int osd_otable_it_key_size(const struct lu_env *env,
1962                                   const struct dt_it *di)
1963 {
1964         return sizeof(__u64);
1965 }
1966
1967 static int osd_otable_it_rec(const struct lu_env *env, const struct dt_it *di,
1968                              struct dt_rec *rec, __u32 attr)
1969 {
1970         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
1971         struct osd_otable_cache *ooc = &it->ooi_cache;
1972
1973         *(struct lu_fid *)rec = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_fid;
1974
1975         /* Filter out Invald FID already. */
1976         LASSERTF(fid_is_sane((struct lu_fid *)rec),
1977                  "Invalid FID "DFID", p_idx = %d, c_idx = %d\n",
1978                  PFID((struct lu_fid *)rec),
1979                  ooc->ooc_producer_idx, ooc->ooc_consumer_idx);
1980
1981         return 0;
1982 }
1983
1984 static __u64 osd_otable_it_store(const struct lu_env *env,
1985                                  const struct dt_it *di)
1986 {
1987         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
1988         struct osd_otable_cache *ooc = &it->ooi_cache;
1989         __u64                    hash;
1990
1991         if (it->ooi_user_ready && ooc->ooc_consumer_idx != -1)
1992                 hash = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_lid.oii_ino;
1993         else
1994                 hash = ooc->ooc_pos_preload;
1995         return hash;
1996 }
1997
1998 /**
1999  * Set the OSD layer iteration start position as the specified hash.
2000  */
2001 static int osd_otable_it_load(const struct lu_env *env,
2002                               const struct dt_it *di, __u64 hash)
2003 {
2004         struct osd_otable_it    *it    = (struct osd_otable_it *)di;
2005         struct osd_device       *dev   = it->ooi_dev;
2006         struct osd_otable_cache *ooc   = &it->ooi_cache;
2007         struct osd_scrub        *scrub = &dev->od_scrub;
2008         int                      rc;
2009         ENTRY;
2010
2011         /* Forbid to set iteration position after iteration started. */
2012         if (it->ooi_user_ready)
2013                 RETURN(-EPERM);
2014
2015         if (hash > OSD_OTABLE_MAX_HASH)
2016                 hash = OSD_OTABLE_MAX_HASH;
2017
2018         ooc->ooc_pos_preload = hash;
2019         if (ooc->ooc_pos_preload <= LDISKFS_FIRST_INO(osd_sb(dev)))
2020                 ooc->ooc_pos_preload = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
2021
2022         it->ooi_user_ready = 1;
2023         if (!scrub->os_full_speed)
2024                 cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
2025
2026         /* Unplug OSD layer iteration by the first next() call. */
2027         rc = osd_otable_it_next(env, (struct dt_it *)it);
2028
2029         RETURN(rc);
2030 }
2031
2032 static int osd_otable_it_key_rec(const struct lu_env *env,
2033                                  const struct dt_it *di, void *key_rec)
2034 {
2035         return 0;
2036 }
2037
2038 const struct dt_index_operations osd_otable_ops = {
2039         .dio_it = {
2040                 .init     = osd_otable_it_init,
2041                 .fini     = osd_otable_it_fini,
2042                 .get      = osd_otable_it_get,
2043                 .put      = osd_otable_it_put,
2044                 .next     = osd_otable_it_next,
2045                 .key      = osd_otable_it_key,
2046                 .key_size = osd_otable_it_key_size,
2047                 .rec      = osd_otable_it_rec,
2048                 .store    = osd_otable_it_store,
2049                 .load     = osd_otable_it_load,
2050                 .key_rec  = osd_otable_it_key_rec,
2051         }
2052 };
2053
2054 /* high priority inconsistent items list APIs */
2055
2056 int osd_oii_insert(struct osd_device *dev, struct osd_idmap_cache *oic,
2057                    int insert)
2058 {
2059         struct osd_inconsistent_item *oii;
2060         struct osd_scrub             *scrub  = &dev->od_scrub;
2061         struct ptlrpc_thread         *thread = &scrub->os_thread;
2062         int                           wakeup = 0;
2063         ENTRY;
2064
2065         OBD_ALLOC_PTR(oii);
2066         if (unlikely(oii == NULL))
2067                 RETURN(-ENOMEM);
2068
2069         CFS_INIT_LIST_HEAD(&oii->oii_list);
2070         oii->oii_cache = *oic;
2071         oii->oii_insert = insert;
2072
2073         spin_lock(&scrub->os_lock);
2074         if (unlikely(!thread_is_running(thread))) {
2075                 spin_unlock(&scrub->os_lock);
2076                 OBD_FREE_PTR(oii);
2077                 RETURN(-EAGAIN);
2078         }
2079
2080         if (cfs_list_empty(&scrub->os_inconsistent_items))
2081                 wakeup = 1;
2082         cfs_list_add_tail(&oii->oii_list, &scrub->os_inconsistent_items);
2083         spin_unlock(&scrub->os_lock);
2084
2085         if (wakeup != 0)
2086                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
2087
2088         RETURN(0);
2089 }
2090
2091 int osd_oii_lookup(struct osd_device *dev, const struct lu_fid *fid,
2092                    struct osd_inode_id *id)
2093 {
2094         struct osd_scrub             *scrub = &dev->od_scrub;
2095         struct osd_inconsistent_item *oii;
2096         ENTRY;
2097
2098         spin_lock(&scrub->os_lock);
2099         cfs_list_for_each_entry(oii, &scrub->os_inconsistent_items, oii_list) {
2100                 if (lu_fid_eq(fid, &oii->oii_cache.oic_fid)) {
2101                         *id = oii->oii_cache.oic_lid;
2102                         spin_unlock(&scrub->os_lock);
2103                         RETURN(0);
2104                 }
2105         }
2106         spin_unlock(&scrub->os_lock);
2107
2108         RETURN(-ENOENT);
2109 }
2110
2111 /* OI scrub dump */
2112
2113 static const char *scrub_status_names[] = {
2114         "init",
2115         "scanning",
2116         "completed",
2117         "failed",
2118         "stopped",
2119         "paused",
2120         "crashed",
2121         NULL
2122 };
2123
2124 static const char *scrub_flags_names[] = {
2125         "recreated",
2126         "inconsistent",
2127         "auto",
2128         "upgrade",
2129         NULL
2130 };
2131
2132 static const char *scrub_param_names[] = {
2133         "failout",
2134         NULL
2135 };
2136
2137 static int scrub_bits_dump(char **buf, int *len, int bits, const char *names[],
2138                            const char *prefix)
2139 {
2140         int save = *len;
2141         int flag;
2142         int rc;
2143         int i;
2144
2145         rc = snprintf(*buf, *len, "%s:%c", prefix, bits != 0 ? ' ' : '\n');
2146         if (rc <= 0)
2147                 return -ENOSPC;
2148
2149         *buf += rc;
2150         *len -= rc;
2151         for (i = 0, flag = 1; bits != 0; i++, flag = 1 << i) {
2152                 if (flag & bits) {
2153                         bits &= ~flag;
2154                         rc = snprintf(*buf, *len, "%s%c", names[i],
2155                                       bits != 0 ? ',' : '\n');
2156                         if (rc <= 0)
2157                                 return -ENOSPC;
2158
2159                         *buf += rc;
2160                         *len -= rc;
2161                 }
2162         }
2163         return save - *len;
2164 }
2165
2166 static int scrub_time_dump(char **buf, int *len, __u64 time, const char *prefix)
2167 {
2168         int rc;
2169
2170         if (time != 0)
2171                 rc = snprintf(*buf, *len, "%s: "LPU64" seconds\n", prefix,
2172                               cfs_time_current_sec() - time);
2173         else
2174                 rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
2175         if (rc <= 0)
2176                 return -ENOSPC;
2177
2178         *buf += rc;
2179         *len -= rc;
2180         return rc;
2181 }
2182
2183 static int scrub_pos_dump(char **buf, int *len, __u64 pos, const char *prefix)
2184 {
2185         int rc;
2186
2187         if (pos != 0)
2188                 rc = snprintf(*buf, *len, "%s: "LPU64"\n", prefix, pos);
2189         else
2190                 rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
2191         if (rc <= 0)
2192                 return -ENOSPC;
2193
2194         *buf += rc;
2195         *len -= rc;
2196         return rc;
2197 }
2198
2199 int osd_scrub_dump(struct osd_device *dev, char *buf, int len)
2200 {
2201         struct osd_scrub  *scrub   = &dev->od_scrub;
2202         struct scrub_file *sf      = &scrub->os_file;
2203         __u64              checked;
2204         __u64              speed;
2205         int                save    = len;
2206         int                ret     = -ENOSPC;
2207         int                rc;
2208
2209         down_read(&scrub->os_rwsem);
2210         rc = snprintf(buf, len,
2211                       "name: OI_scrub\n"
2212                       "magic: 0x%x\n"
2213                       "oi_files: %d\n"
2214                       "status: %s\n",
2215                       sf->sf_magic, (int)sf->sf_oi_count,
2216                       scrub_status_names[sf->sf_status]);
2217         if (rc <= 0)
2218                 goto out;
2219
2220         buf += rc;
2221         len -= rc;
2222         rc = scrub_bits_dump(&buf, &len, sf->sf_flags, scrub_flags_names,
2223                              "flags");
2224         if (rc < 0)
2225                 goto out;
2226
2227         rc = scrub_bits_dump(&buf, &len, sf->sf_param, scrub_param_names,
2228                              "param");
2229         if (rc < 0)
2230                 goto out;
2231
2232         rc = scrub_time_dump(&buf, &len, sf->sf_time_last_complete,
2233                              "time_since_last_completed");
2234         if (rc < 0)
2235                 goto out;
2236
2237         rc = scrub_time_dump(&buf, &len, sf->sf_time_latest_start,
2238                              "time_since_latest_start");
2239         if (rc < 0)
2240                 goto out;
2241
2242         rc = scrub_time_dump(&buf, &len, sf->sf_time_last_checkpoint,
2243                              "time_since_last_checkpoint");
2244         if (rc < 0)
2245                 goto out;
2246
2247         rc = scrub_pos_dump(&buf, &len, sf->sf_pos_latest_start,
2248                             "latest_start_position");
2249         if (rc < 0)
2250                 goto out;
2251
2252         rc = scrub_pos_dump(&buf, &len, sf->sf_pos_last_checkpoint,
2253                             "last_checkpoint_position");
2254         if (rc < 0)
2255                 goto out;
2256
2257         rc = scrub_pos_dump(&buf, &len, sf->sf_pos_first_inconsistent,
2258                             "first_failure_position");
2259         if (rc < 0)
2260                 goto out;
2261
2262         checked = sf->sf_items_checked + scrub->os_new_checked;
2263         rc = snprintf(buf, len,
2264                       "checked: "LPU64"\n"
2265                       "updated: "LPU64"\n"
2266                       "failed: "LPU64"\n"
2267                       "prior_updated: "LPU64"\n"
2268                       "noscrub: "LPU64"\n"
2269                       "igif: "LPU64"\n"
2270                       "success_count: %u\n",
2271                       checked, sf->sf_items_updated, sf->sf_items_failed,
2272                       sf->sf_items_updated_prior, sf->sf_items_noscrub,
2273                       sf->sf_items_igif, sf->sf_success_count);
2274         if (rc <= 0)
2275                 goto out;
2276
2277         buf += rc;
2278         len -= rc;
2279         speed = checked;
2280         if (thread_is_running(&scrub->os_thread)) {
2281                 cfs_duration_t duration = cfs_time_current() -
2282                                           scrub->os_time_last_checkpoint;
2283                 __u64 new_checked = scrub->os_new_checked * CFS_HZ;
2284                 __u32 rtime = sf->sf_run_time +
2285                               cfs_duration_sec(duration + HALF_SEC);
2286
2287                 if (duration != 0)
2288                         do_div(new_checked, duration);
2289                 if (rtime != 0)
2290                         do_div(speed, rtime);
2291                 rc = snprintf(buf, len,
2292                               "run_time: %u seconds\n"
2293                               "average_speed: "LPU64" objects/sec\n"
2294                               "real-time_speed: "LPU64" objects/sec\n"
2295                               "current_position: %u\n",
2296                               rtime, speed, new_checked, scrub->os_pos_current);
2297         } else {
2298                 if (sf->sf_run_time != 0)
2299                         do_div(speed, sf->sf_run_time);
2300                 rc = snprintf(buf, len,
2301                               "run_time: %u seconds\n"
2302                               "average_speed: "LPU64" objects/sec\n"
2303                               "real-time_speed: N/A\n"
2304                               "current_position: N/A\n",
2305                               sf->sf_run_time, speed);
2306         }
2307         if (rc <= 0)
2308                 goto out;
2309
2310         buf += rc;
2311         len -= rc;
2312         ret = save - len;
2313
2314 out:
2315         up_read(&scrub->os_rwsem);
2316         return ret;
2317 }