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 Whamcloud, Inc.
  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 static inline struct osd_device *osd_scrub2dev(struct osd_scrub *scrub)
  54 {
  55         return container_of0(scrub, struct osd_device, od_scrub);
  56 }
  57
  58 static inline struct super_block *osd_scrub2sb(struct osd_scrub *scrub)
  59 {
  60         return osd_sb(osd_scrub2dev(scrub));
  61 }
  62
  63 static void osd_scrub_file_to_cpu(struct scrub_file *des,
  64                                   struct scrub_file *src)
  65 {
  66         memcpy(des->sf_uuid, src->sf_uuid, 16);
  67         des->sf_flags   = le64_to_cpu(src->sf_flags);
  68         des->sf_magic   = le32_to_cpu(src->sf_magic);
  69         des->sf_status  = le16_to_cpu(src->sf_status);
  70         des->sf_param   = le16_to_cpu(src->sf_param);
  71         des->sf_time_last_complete      =
  72                                 le64_to_cpu(src->sf_time_last_complete);
  73         des->sf_time_latest_start       =
  74                                 le64_to_cpu(src->sf_time_latest_start);
  75         des->sf_time_last_checkpoint    =
  76                                 le64_to_cpu(src->sf_time_last_checkpoint);
  77         des->sf_pos_latest_start        =
  78                                 le64_to_cpu(src->sf_pos_latest_start);
  79         des->sf_pos_last_checkpoint     =
  80                                 le64_to_cpu(src->sf_pos_last_checkpoint);
  81         des->sf_pos_first_inconsistent  =
  82                                 le64_to_cpu(src->sf_pos_first_inconsistent);
  83         des->sf_items_checked           =
  84                                 le64_to_cpu(src->sf_items_checked);
  85         des->sf_items_updated           =
  86                                 le64_to_cpu(src->sf_items_updated);
  87         des->sf_items_failed            =
  88                                 le64_to_cpu(src->sf_items_failed);
  89         des->sf_items_updated_prior     =
  90                                 le64_to_cpu(src->sf_items_updated_prior);
  91         des->sf_run_time        = le32_to_cpu(src->sf_run_time);
  92         des->sf_success_count   = le32_to_cpu(src->sf_success_count);
  93         des->sf_oi_count        = le16_to_cpu(src->sf_oi_count);
  94         memcpy(des->sf_oi_bitmap, src->sf_oi_bitmap, SCRUB_OI_BITMAP_SIZE);
  95 }
  96
  97 static void osd_scrub_file_to_le(struct scrub_file *des,
  98                                  struct scrub_file *src)
  99 {
 100         memcpy(des->sf_uuid, src->sf_uuid, 16);
 101         des->sf_flags   = cpu_to_le64(src->sf_flags);
 102         des->sf_magic   = cpu_to_le32(src->sf_magic);
 103         des->sf_status  = cpu_to_le16(src->sf_status);
 104         des->sf_param   = cpu_to_le16(src->sf_param);
 105         des->sf_time_last_complete      =
 106                                 cpu_to_le64(src->sf_time_last_complete);
 107         des->sf_time_latest_start       =
 108                                 cpu_to_le64(src->sf_time_latest_start);
 109         des->sf_time_last_checkpoint    =
 110                                 cpu_to_le64(src->sf_time_last_checkpoint);
 111         des->sf_pos_latest_start        =
 112                                 cpu_to_le64(src->sf_pos_latest_start);
 113         des->sf_pos_last_checkpoint     =
 114                                 cpu_to_le64(src->sf_pos_last_checkpoint);
 115         des->sf_pos_first_inconsistent  =
 116                                 cpu_to_le64(src->sf_pos_first_inconsistent);
 117         des->sf_items_checked           =
 118                                 cpu_to_le64(src->sf_items_checked);
 119         des->sf_items_updated           =
 120                                 cpu_to_le64(src->sf_items_updated);
 121         des->sf_items_failed            =
 122                                 cpu_to_le64(src->sf_items_failed);
 123         des->sf_items_updated_prior     =
 124                                 cpu_to_le64(src->sf_items_updated_prior);
 125         des->sf_run_time        = cpu_to_le32(src->sf_run_time);
 126         des->sf_success_count   = cpu_to_le32(src->sf_success_count);
 127         des->sf_oi_count        = cpu_to_le16(src->sf_oi_count);
 128         memcpy(des->sf_oi_bitmap, src->sf_oi_bitmap, SCRUB_OI_BITMAP_SIZE);
 129 }
 130
 131 static void osd_scrub_file_init(struct osd_scrub *scrub, __u8 *uuid)
 132 {
 133         struct scrub_file *sf = &scrub->os_file;
 134
 135         memset(sf, 0, sizeof(*sf));
 136         memcpy(sf->sf_uuid, uuid, 16);
 137         sf->sf_magic = SCRUB_MAGIC_V1;
 138         sf->sf_status = SS_INIT;
 139 }
 140
 141 void osd_scrub_file_reset(struct osd_scrub *scrub, __u8 *uuid, __u64 flags)
 142 {
 143         struct scrub_file *sf = &scrub->os_file;
 144
 145         CDEBUG(D_LFSCK, "Reset OI scrub file, flags = "LPX64"\n", flags);
 146         memcpy(sf->sf_uuid, uuid, 16);
 147         sf->sf_status = SS_INIT;
 148         sf->sf_flags |= flags;
 149         sf->sf_param = 0;
 150         sf->sf_run_time = 0;
 151         sf->sf_time_latest_start = 0;
 152         sf->sf_time_last_checkpoint = 0;
 153         sf->sf_pos_latest_start = 0;
 154         sf->sf_pos_last_checkpoint = 0;
 155         sf->sf_pos_first_inconsistent = 0;
 156         sf->sf_items_checked = 0;
 157         sf->sf_items_updated = 0;
 158         sf->sf_items_failed = 0;
 159         sf->sf_items_updated_prior = 0;
 160 }
 161
 162 static int osd_scrub_file_load(struct osd_scrub *scrub)
 163 {
 164         loff_t  pos  = 0;
 165         char   *name = LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name;
 166         int     len  = sizeof(scrub->os_file_disk);
 167         int     rc;
 168
 169         rc = osd_ldiskfs_read(scrub->os_inode, &scrub->os_file_disk, len, &pos);
 170         if (rc == len) {
 171                 struct scrub_file *sf = &scrub->os_file;
 172
 173                 osd_scrub_file_to_cpu(sf, &scrub->os_file_disk);
 174                 if (sf->sf_magic != SCRUB_MAGIC_V1) {
 175                         CWARN("%.16s: invalid scrub magic 0x%x != 0x%x\n,",
 176                               name, sf->sf_magic, SCRUB_MAGIC_V1);
 177                         /* Process it as new scrub file. */
 178                         rc = -ENOENT;
 179                 } else {
 180                         rc = 0;
 181                 }
 182         } else if (rc != 0) {
 183                 CERROR("%.16s: fail to load scrub file, expected = %d, "
 184                        "rc = %d\n", name, len, rc);
 185                 if (rc > 0)
 186                         rc = -EFAULT;
 187         } else {
 188                 /* return -ENOENT for empty scrub file case. */
 189                 rc = -ENOENT;
 190         }
 191
 192         return rc;
 193 }
 194
 195 int osd_scrub_file_store(struct osd_scrub *scrub)
 196 {
 197         struct osd_device *dev;
 198         handle_t          *jh;
 199         loff_t             pos     = 0;
 200         int                len     = sizeof(scrub->os_file_disk);
 201         int                credits;
 202         int                rc;
 203
 204         dev = container_of0(scrub, struct osd_device, od_scrub);
 205         credits = osd_dto_credits_noquota[DTO_WRITE_BASE] +
 206                   osd_dto_credits_noquota[DTO_WRITE_BLOCK];
 207         jh = ldiskfs_journal_start_sb(osd_sb(dev), credits);
 208         if (IS_ERR(jh)) {
 209                 rc = PTR_ERR(jh);
 210                 CERROR("%.16s: fail to start trans for scrub store, rc = %d\n",
 211                        LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,rc);
 212                 return rc;
 213         }
 214
 215         osd_scrub_file_to_le(&scrub->os_file_disk, &scrub->os_file);
 216         rc = osd_ldiskfs_write_record(scrub->os_inode, &scrub->os_file_disk,
 217                                       len, &pos, jh);
 218         ldiskfs_journal_stop(jh);
 219         if (rc != 0)
 220                 CERROR("%.16s: fail to store scrub file, expected = %d, "
 221                        "rc = %d\n",
 222                        LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,
 223                        len, rc);
 224         scrub->os_time_last_checkpoint = cfs_time_current();
 225         scrub->os_time_next_checkpoint = scrub->os_time_last_checkpoint +
 226                                 cfs_time_seconds(SCRUB_CHECKPOINT_INTERVAL);
 227         return rc;
 228 }
 229
 230 static int osd_scrub_prep(struct osd_device *dev)
 231 {
 232         struct osd_scrub     *scrub  = &dev->od_scrub;
 233         struct ptlrpc_thread *thread = &scrub->os_thread;
 234         struct scrub_file    *sf     = &scrub->os_file;
 235         __u32                 flags  = scrub->os_start_flags;
 236         int                   rc;
 237         ENTRY;
 238
 239         cfs_down_write(&scrub->os_rwsem);
 240         if (flags & SS_SET_FAILOUT)
 241                 sf->sf_param |= SP_FAILOUT;
 242
 243         if (flags & SS_CLEAR_FAILOUT)
 244                 sf->sf_param &= ~SP_FAILOUT;
 245
 246         if (flags & SS_RESET)
 247                 osd_scrub_file_reset(scrub,
 248                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid, sf->sf_flags);
 249
 250         if (flags & SS_AUTO) {
 251                 scrub->os_full_speed = 1;
 252                 sf->sf_flags |= SF_AUTO;
 253         } else {
 254                 scrub->os_full_speed = 0;
 255         }
 256
 257         if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT))
 258                 scrub->os_full_speed = 1;
 259
 260         scrub->os_in_prior = 0;
 261         scrub->os_waiting = 0;
 262         scrub->os_new_checked = 0;
 263         if (sf->sf_pos_last_checkpoint != 0)
 264                 sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
 265         else
 266                 sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev));
 267
 268         scrub->os_pos_current = sf->sf_pos_latest_start;
 269         sf->sf_status = SS_SCANNING;
 270         sf->sf_time_latest_start = cfs_time_current_sec();
 271         sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
 272         rc = osd_scrub_file_store(scrub);
 273         if (rc == 0) {
 274                 cfs_spin_lock(&scrub->os_lock);
 275                 thread_set_flags(thread, SVC_RUNNING);
 276                 cfs_spin_unlock(&scrub->os_lock);
 277                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
 278         }
 279         cfs_up_write(&scrub->os_rwsem);
 280
 281         RETURN(rc);
 282 }
 283
 284 static int
 285 osd_scrub_error(struct osd_device *dev, struct osd_inode_id *lid, int rc)
 286 {
 287         struct osd_scrub  *scrub = &dev->od_scrub;
 288         struct scrub_file *sf    = &scrub->os_file;
 289
 290         cfs_down_write(&scrub->os_rwsem);
 291         scrub->os_new_checked++;
 292         sf->sf_items_failed++;
 293         if (sf->sf_pos_first_inconsistent == 0 ||
 294             sf->sf_pos_first_inconsistent > lid->oii_ino)
 295                 sf->sf_pos_first_inconsistent = lid->oii_ino;
 296         cfs_up_write(&scrub->os_rwsem);
 297         return sf->sf_param & SP_FAILOUT ? rc : 0;
 298 }
 299
 300 static int
 301 osd_scrub_check_update(struct osd_thread_info *info, struct osd_device *dev,
 302                        struct osd_idmap_cache *oic)
 303 {
 304         struct osd_scrub             *scrub  = &dev->od_scrub;
 305         struct scrub_file            *sf     = &scrub->os_file;
 306         struct osd_inode_id          *lid2   = &info->oti_id;
 307         struct lu_fid                *oi_fid = &info->oti_fid;
 308         struct osd_inode_id          *oi_id  = &info->oti_id2;
 309         handle_t                     *jh     = NULL;
 310         struct osd_inconsistent_item *oii    = NULL;
 311         struct inode                 *inode  = NULL;
 312         struct lu_fid                *fid    = &oic->oic_fid;
 313         struct osd_inode_id          *lid    = &oic->oic_lid;
 314         struct iam_container         *bag;
 315         struct iam_path_descr        *ipd;
 316         int                           ops    = DTO_INDEX_UPDATE;
 317         int                           idx;
 318         int                           rc;
 319         ENTRY;
 320
 321         if (scrub->os_in_prior)
 322                 oii = cfs_list_entry(oic, struct osd_inconsistent_item,
 323                                      oii_cache);
 324
 325         cfs_down_write(&scrub->os_rwsem);
 326         scrub->os_new_checked++;
 327         if (lid->oii_ino < sf->sf_pos_latest_start && oii == NULL)
 328                 GOTO(out, rc = 0);
 329
 330         if (oii != NULL && oii->oii_insert)
 331                 goto iget;
 332
 333         rc = osd_oi_lookup(info, dev, fid, lid2);
 334         if (rc != 0) {
 335                 if (rc != -ENOENT)
 336                         GOTO(out, rc);
 337
 338 iget:
 339                 inode = osd_iget(info, dev, lid);
 340                 if (IS_ERR(inode)) {
 341                         rc = PTR_ERR(inode);
 342                         /* Someone removed the inode. */
 343                         if (rc == -ENOENT || rc == -ESTALE)
 344                                 rc = 0;
 345                         GOTO(out, rc);
 346                 }
 347
 348                 /* Prevent the inode to be unlinked during OI scrub. */
 349                 cfs_mutex_lock(&inode->i_mutex);
 350                 if (unlikely(inode->i_nlink == 0)) {
 351                         cfs_mutex_unlock(&inode->i_mutex);
 352                         iput(inode);
 353                         GOTO(out, rc = 0);
 354                 }
 355
 356                 ops = DTO_INDEX_INSERT;
 357                 idx = osd_oi_fid2idx(dev, fid);
 358                 if (unlikely(!ldiskfs_test_bit(idx, sf->sf_oi_bitmap)))
 359                         ldiskfs_set_bit(idx, sf->sf_oi_bitmap);
 360                 sf->sf_flags |= SF_RECREATED;
 361         } else if (osd_id_eq(lid, lid2)) {
 362                         GOTO(out, rc = 0);
 363         }
 364
 365         sf->sf_flags |= SF_INCONSISTENT;
 366         fid_cpu_to_be(oi_fid, fid);
 367         osd_id_pack(oi_id, &oic->oic_lid);
 368         jh = ldiskfs_journal_start_sb(osd_sb(dev),
 369                                 osd_dto_credits_noquota[ops]);
 370         if (IS_ERR(jh)) {
 371                 rc = PTR_ERR(jh);
 372                 CERROR("%.16s: fail to start trans for scrub store, rc = %d\n",
 373                        LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name, rc);
 374                 GOTO(out, rc);
 375         }
 376
 377         bag = &osd_fid2oi(dev, fid)->oi_dir.od_container;
 378         ipd = osd_idx_ipd_get(info->oti_env, bag);
 379         if (unlikely(ipd == NULL)) {
 380                 ldiskfs_journal_stop(jh);
 381                 CERROR("%.16s: fail to get ipd for scrub store\n",
 382                         LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name);
 383                 GOTO(out, rc = -ENOMEM);
 384         }
 385
 386         if (ops == DTO_INDEX_UPDATE)
 387                 rc = iam_update(jh, bag, (const struct iam_key *)oi_fid,
 388                                 (struct iam_rec *)oi_id, ipd);
 389         else
 390                 rc = iam_insert(jh, bag, (const struct iam_key *)oi_fid,
 391                                 (struct iam_rec *)oi_id, ipd);
 392         osd_ipd_put(info->oti_env, bag, ipd);
 393         ldiskfs_journal_stop(jh);
 394         if (rc == 0) {
 395                 if (scrub->os_in_prior)
 396                         sf->sf_items_updated_prior++;
 397                 else
 398                         sf->sf_items_updated++;
 399         }
 400
 401         GOTO(out, rc);
 402
 403 out:
 404         if (rc != 0) {
 405                 sf->sf_items_failed++;
 406                 if (sf->sf_pos_first_inconsistent == 0 ||
 407                     sf->sf_pos_first_inconsistent > lid->oii_ino)
 408                         sf->sf_pos_first_inconsistent = lid->oii_ino;
 409         }
 410
 411         if (ops == DTO_INDEX_INSERT) {
 412                 cfs_mutex_unlock(&inode->i_mutex);
 413                 iput(inode);
 414         }
 415         cfs_up_write(&scrub->os_rwsem);
 416
 417         if (oii != NULL) {
 418                 LASSERT(!cfs_list_empty(&oii->oii_list));
 419
 420                 cfs_spin_lock(&scrub->os_lock);
 421                 cfs_list_del_init(&oii->oii_list);
 422                 cfs_spin_unlock(&scrub->os_lock);
 423                 OBD_FREE_PTR(oii);
 424         }
 425         RETURN(sf->sf_param & SP_FAILOUT ? rc : 0);
 426 }
 427
 428 static int do_osd_scrub_checkpoint(struct osd_scrub *scrub)
 429 {
 430         struct scrub_file *sf = &scrub->os_file;
 431         int                rc;
 432         ENTRY;
 433
 434         cfs_down_write(&scrub->os_rwsem);
 435         sf->sf_items_checked += scrub->os_new_checked;
 436         scrub->os_new_checked = 0;
 437         sf->sf_pos_last_checkpoint = scrub->os_pos_current;
 438         sf->sf_time_last_checkpoint = cfs_time_current_sec();
 439         sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
 440                                             scrub->os_time_last_checkpoint);
 441         rc = osd_scrub_file_store(scrub);
 442         cfs_up_write(&scrub->os_rwsem);
 443
 444         RETURN(rc);
 445 }
 446
 447 static inline int osd_scrub_checkpoint(struct osd_scrub *scrub)
 448 {
 449         if (unlikely(cfs_time_beforeq(scrub->os_time_next_checkpoint,
 450                                       cfs_time_current()) &&
 451                      scrub->os_new_checked > 0))
 452                 return do_osd_scrub_checkpoint(scrub);
 453         return 0;
 454 }
 455
 456 static void osd_scrub_post(struct osd_scrub *scrub, int result)
 457 {
 458         struct scrub_file *sf = &scrub->os_file;
 459         ENTRY;
 460
 461         cfs_down_write(&scrub->os_rwsem);
 462         cfs_spin_lock(&scrub->os_lock);
 463         thread_set_flags(&scrub->os_thread, SVC_STOPPING);
 464         cfs_spin_unlock(&scrub->os_lock);
 465         if (scrub->os_new_checked > 0) {
 466                 sf->sf_items_checked += scrub->os_new_checked;
 467                 scrub->os_new_checked = 0;
 468                 sf->sf_pos_last_checkpoint = scrub->os_pos_current;
 469         }
 470         sf->sf_time_last_checkpoint = cfs_time_current_sec();
 471         if (result > 0) {
 472                 sf->sf_status = SS_COMPLETED;
 473                 memset(sf->sf_oi_bitmap, 0, SCRUB_OI_BITMAP_SIZE);
 474                 sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT | SF_AUTO);
 475                 sf->sf_time_last_complete = sf->sf_time_last_checkpoint;
 476                 sf->sf_success_count++;
 477         } else if (result == 0) {
 478                 sf->sf_status = SS_PAUSED;
 479         } else {
 480                 sf->sf_status = SS_FAILED;
 481         }
 482         sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
 483                                             scrub->os_time_last_checkpoint);
 484         result = osd_scrub_file_store(scrub);
 485         if (result < 0)
 486                 CERROR("%.16s: fail to osd_scrub_post, rc = %d\n",
 487                        LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,
 488                        result);
 489         cfs_up_write(&scrub->os_rwsem);
 490
 491         EXIT;
 492 }
 493
 494 #define SCRUB_NEXT_BREAK        1 /* exit current loop and process next group */
 495 #define SCRUB_NEXT_CONTINUE     2 /* skip current object and process next bit */
 496 #define SCRUB_NEXT_EXIT         3 /* exit all the loops */
 497 #define SCRUB_NEXT_WAIT         4 /* wait for free cache slot */
 498 #define SCRUB_NEXT_CRASH        5 /* simulate system crash during OI scrub */
 499 #define SCRUB_NEXT_FATAL        6 /* simulate failure during OI scrub */
 500
 501 struct osd_iit_param {
 502         struct super_block *sb;
 503         struct buffer_head *bitmap;
 504         ldiskfs_group_t bg;
 505         __u32 gbase;
 506         __u32 offset;
 507 };
 508
 509 typedef int (*osd_iit_next_policy)(struct osd_thread_info *info,
 510                                    struct osd_device *dev,
 511                                    struct osd_iit_param *param,
 512                                    struct osd_idmap_cache **oic,
 513                                    int noslot);
 514
 515 typedef int (*osd_iit_exec_policy)(struct osd_thread_info *info,
 516                                    struct osd_device *dev,
 517                                    struct osd_iit_param *param,
 518                                    struct osd_idmap_cache *oic,
 519                                    int *noslot, int rc);
 520
 521 static inline int osd_scrub_has_window(struct osd_scrub *scrub,
 522                                        struct osd_otable_cache *ooc)
 523 {
 524         return scrub->os_pos_current < ooc->ooc_pos_preload + SCRUB_WINDOW_SIZE;
 525 }
 526
 527 static int osd_iit_next(struct osd_iit_param *param, __u32 *pos)
 528 {
 529         param->offset = ldiskfs_find_next_bit(param->bitmap->b_data,
 530                         LDISKFS_INODES_PER_GROUP(param->sb), param->offset);
 531         if (param->offset >= LDISKFS_INODES_PER_GROUP(param->sb)) {
 532                 *pos = 1 + (param->bg+1) * LDISKFS_INODES_PER_GROUP(param->sb);
 533                 return SCRUB_NEXT_BREAK;
 534         } else {
 535                 *pos = param->gbase + param->offset;
 536                 return 0;
 537         }
 538 }
 539
 540 static int osd_iit_iget(struct osd_thread_info *info, struct osd_device *dev,
 541                         struct lu_fid *fid, struct osd_inode_id *lid, __u32 pos,
 542                         struct super_block *sb, struct inode **pinode)
 543 {
 544         struct inode *inode;
 545         int           rc;
 546
 547         osd_id_gen(lid, pos, OSD_OII_NOGEN);
 548         inode = osd_iget_fid(info, dev, lid, fid);
 549         if (IS_ERR(inode)) {
 550                 rc = PTR_ERR(inode);
 551                 /* The inode may be removed after bitmap searching, or the
 552                  * file is new created without inode initialized yet. */
 553                 if (rc == -ENOENT || rc == -ESTALE)
 554                         return SCRUB_NEXT_CONTINUE;
 555
 556                 CERROR("%.16s: fail to read inode, ino# = %u, rc = %d\n",
 557                        LDISKFS_SB(sb)->s_es->s_volume_name, pos, rc);
 558                 return rc;
 559         }
 560
 561         *pinode = inode;
 562         return 0;
 563 }
 564
 565 static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
 566                           struct osd_iit_param *param,
 567                           struct osd_idmap_cache **oic, int noslot)
 568 {
 569         struct osd_scrub     *scrub  = &dev->od_scrub;
 570         struct ptlrpc_thread *thread = &scrub->os_thread;
 571         struct lu_fid        *fid;
 572         struct osd_inode_id  *lid;
 573         struct inode         *inode;
 574         int                   rc;
 575
 576         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_DELAY) && cfs_fail_val > 0) {
 577                 struct l_wait_info lwi;
 578
 579                 lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val), NULL, NULL);
 580                 l_wait_event(thread->t_ctl_waitq,
 581                              !cfs_list_empty(&scrub->os_inconsistent_items) ||
 582                              !thread_is_running(thread),
 583                              &lwi);
 584         }
 585
 586         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_CRASH)) {
 587                 cfs_spin_lock(&scrub->os_lock);
 588                 thread_set_flags(thread, SVC_STOPPING);
 589                 cfs_spin_unlock(&scrub->os_lock);
 590                 return SCRUB_NEXT_CRASH;
 591         }
 592
 593         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_FATAL))
 594                 return SCRUB_NEXT_FATAL;
 595
 596         if (unlikely(!thread_is_running(thread)))
 597                 return SCRUB_NEXT_EXIT;
 598
 599         if (!cfs_list_empty(&scrub->os_inconsistent_items)) {
 600                 struct osd_inconsistent_item *oii;
 601
 602                 oii = cfs_list_entry(scrub->os_inconsistent_items.next,
 603                                      struct osd_inconsistent_item, oii_list);
 604                 *oic = &oii->oii_cache;
 605                 scrub->os_in_prior = 1;
 606                 return 0;
 607         }
 608
 609         if (noslot != 0)
 610                 return SCRUB_NEXT_WAIT;
 611
 612         rc = osd_iit_next(param, &scrub->os_pos_current);
 613         if (rc != 0)
 614                 return rc;
 615
 616         *oic = &scrub->os_oic;
 617         fid = &(*oic)->oic_fid;
 618         lid = &(*oic)->oic_lid;
 619         rc = osd_iit_iget(info, dev, fid, lid,
 620                           scrub->os_pos_current, param->sb, &inode);
 621         if (rc != 0)
 622                 return rc;
 623
 624         if (!fid_is_norm(fid) || inode->i_state & I_LUSTRE_NOSCRUB)
 625                 rc = SCRUB_NEXT_CONTINUE;
 626         iput(inode);
 627         return rc;
 628 }
 629
 630 static int osd_preload_next(struct osd_thread_info *info,
 631                             struct osd_device *dev, struct osd_iit_param *param,
 632                             struct osd_idmap_cache **oic, int noslot)
 633 {
 634         struct osd_otable_cache *ooc    = &dev->od_otable_it->ooi_cache;
 635         struct osd_scrub        *scrub;
 636         struct ptlrpc_thread    *thread;
 637         struct inode            *inode;
 638         int                      rc;
 639
 640         rc = osd_iit_next(param, &ooc->ooc_pos_preload);
 641         if (rc != 0)
 642                 return rc;
 643
 644         scrub = &dev->od_scrub;
 645         thread = &scrub->os_thread;
 646         if (thread_is_running(thread) &&
 647             ooc->ooc_pos_preload >= scrub->os_pos_current)
 648                 return SCRUB_NEXT_EXIT;
 649
 650         rc = osd_iit_iget(info, dev,
 651                           &ooc->ooc_cache[ooc->ooc_producer_idx].oic_fid,
 652                           &ooc->ooc_cache[ooc->ooc_producer_idx].oic_lid,
 653                           ooc->ooc_pos_preload, param->sb, &inode);
 654         /* If succeed, it needs to move forward; otherwise up layer LFSCK may
 655          * ignore the failure, so it still need to skip the inode next time. */
 656         ooc->ooc_pos_preload = param->gbase + ++(param->offset);
 657         if (rc == 0)
 658                 iput(inode);
 659         return rc;
 660 }
 661
 662 static int osd_scrub_exec(struct osd_thread_info *info, struct osd_device *dev,
 663                           struct osd_iit_param *param,
 664                           struct osd_idmap_cache *oic, int *noslot, int rc)
 665 {
 666         struct l_wait_info       lwi    = { 0 };
 667         struct osd_scrub        *scrub  = &dev->od_scrub;
 668         struct ptlrpc_thread    *thread = &scrub->os_thread;
 669         struct osd_otable_it    *it     = dev->od_otable_it;
 670         struct osd_otable_cache *ooc    = it ? &it->ooi_cache : NULL;
 671
 672         switch (rc) {
 673         case SCRUB_NEXT_CONTINUE:
 674                 goto next;
 675         case SCRUB_NEXT_WAIT:
 676                 goto wait;
 677         }
 678
 679         LASSERTF(rc <= 0, "unexpected rc = %d\n", rc);
 680
 681         if (rc != 0)
 682                 rc = osd_scrub_error(dev, &oic->oic_lid, rc);
 683         else
 684                 rc = osd_scrub_check_update(info, dev, oic);
 685         if (rc != 0)
 686                 return rc;
 687
 688         rc = osd_scrub_checkpoint(scrub);
 689         if (rc != 0) {
 690                 CERROR("%.16s: fail to checkpoint, pos = %u, rc = %d\n",
 691                        LDISKFS_SB(param->sb)->s_es->s_volume_name,
 692                        scrub->os_pos_current, rc);
 693                 /* Continue, as long as the scrub itself can go ahead. */
 694         }
 695
 696         if (scrub->os_in_prior) {
 697                 scrub->os_in_prior = 0;
 698                 return 0;
 699         }
 700
 701 next:
 702         scrub->os_pos_current = param->gbase + ++(param->offset);
 703         if (it != NULL && it->ooi_waiting &&
 704             ooc->ooc_pos_preload < scrub->os_pos_current) {
 705                 it->ooi_waiting = 0;
 706                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
 707         }
 708
 709         if (scrub->os_full_speed || rc == SCRUB_NEXT_CONTINUE)
 710                 return 0;
 711
 712 wait:
 713         if (osd_scrub_has_window(scrub, ooc)) {
 714                 *noslot = 0;
 715                 return 0;
 716         }
 717
 718         scrub->os_waiting = 1;
 719         l_wait_event(thread->t_ctl_waitq,
 720                      osd_scrub_has_window(scrub, ooc) ||
 721                      !cfs_list_empty(&scrub->os_inconsistent_items) ||
 722                      !thread_is_running(thread),
 723                      &lwi);
 724         scrub->os_waiting = 0;
 725
 726         if (osd_scrub_has_window(scrub, ooc))
 727                 *noslot = 0;
 728         else
 729                 *noslot = 1;
 730         return 0;
 731 }
 732
 733 static int osd_preload_exec(struct osd_thread_info *info,
 734                             struct osd_device *dev, struct osd_iit_param *param,
 735                             struct osd_idmap_cache *oic, int *noslot, int rc)
 736 {
 737         struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
 738
 739         if (rc == 0) {
 740                 ooc->ooc_cached_items++;
 741                 ooc->ooc_producer_idx = (ooc->ooc_producer_idx + 1) &
 742                                         ~OSD_OTABLE_IT_CACHE_MASK;
 743         }
 744         return rc > 0 ? 0 : rc;
 745 }
 746
 747 #define SCRUB_IT_ALL    1
 748 #define SCRUB_IT_CRASH  2
 749
 750 static int osd_inode_iteration(struct osd_thread_info *info,
 751                                struct osd_device *dev, __u32 max, int preload)
 752 {
 753         osd_iit_next_policy   next;
 754         osd_iit_exec_policy   exec;
 755         __u32                *pos;
 756         __u32                *count;
 757         struct osd_iit_param  param;
 758         __u32                 limit;
 759         int                   noslot = 0;
 760         int                   rc;
 761         ENTRY;
 762
 763         if (preload == 0) {
 764                 struct osd_scrub *scrub = &dev->od_scrub;
 765
 766                 next = osd_scrub_next;
 767                 exec = osd_scrub_exec;
 768                 pos = &scrub->os_pos_current;
 769                 count = &scrub->os_new_checked;
 770         } else {
 771                 struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
 772
 773                 next = osd_preload_next;
 774                 exec = osd_preload_exec;
 775                 pos = &ooc->ooc_pos_preload;
 776                 count = &ooc->ooc_cached_items;
 777         }
 778         param.sb = osd_sb(dev);
 779         limit = le32_to_cpu(LDISKFS_SB(param.sb)->s_es->s_inodes_count);
 780
 781         while (*pos <= limit && *count < max) {
 782                 struct osd_idmap_cache *oic = NULL;
 783
 784                 param.bg = (*pos - 1) / LDISKFS_INODES_PER_GROUP(param.sb);
 785                 param.offset = (*pos - 1) % LDISKFS_INODES_PER_GROUP(param.sb);
 786                 param.gbase = 1 + param.bg * LDISKFS_INODES_PER_GROUP(param.sb);
 787                 param.bitmap = ldiskfs_read_inode_bitmap(param.sb, param.bg);
 788                 if (param.bitmap == NULL) {
 789                         CERROR("%.16s: fail to read bitmap for %u, "
 790                                "scrub will stop, urgent mode\n",
 791                                LDISKFS_SB(param.sb)->s_es->s_volume_name,
 792                                (__u32)param.bg);
 793                         RETURN(-EIO);
 794                 }
 795
 796                 while (param.offset < LDISKFS_INODES_PER_GROUP(param.sb) &&
 797                        *count < max) {
 798                         rc = next(info, dev, &param, &oic, noslot);
 799                         switch (rc) {
 800                         case SCRUB_NEXT_BREAK:
 801                                 goto next_group;
 802                         case SCRUB_NEXT_EXIT:
 803                                 brelse(param.bitmap);
 804                                 RETURN(0);
 805                         case SCRUB_NEXT_CRASH:
 806                                 brelse(param.bitmap);
 807                                 RETURN(SCRUB_IT_CRASH);
 808                         case SCRUB_NEXT_FATAL:
 809                                 brelse(param.bitmap);
 810                                 RETURN(-EINVAL);
 811                         }
 812
 813                         rc = exec(info, dev, &param, oic, &noslot, rc);
 814                         if (rc != 0) {
 815                                 brelse(param.bitmap);
 816                                 RETURN(rc);
 817                         }
 818                 }
 819
 820 next_group:
 821                 brelse(param.bitmap);
 822         }
 823
 824         if (*pos > limit)
 825                 RETURN(SCRUB_IT_ALL);
 826         RETURN(0);
 827 }
 828
 829 static int osd_scrub_main(void *args)
 830 {
 831         struct lu_env         env;
 832         struct osd_device    *dev    = (struct osd_device *)args;
 833         struct osd_scrub     *scrub  = &dev->od_scrub;
 834         struct ptlrpc_thread *thread = &scrub->os_thread;
 835         struct super_block   *sb     = osd_sb(dev);
 836         int                   rc;
 837         ENTRY;
 838
 839         cfs_daemonize("OI_scrub");
 840         rc = lu_env_init(&env, LCT_DT_THREAD);
 841         if (rc != 0) {
 842                 CERROR("%.16s: OI scrub, fail to init env, rc = %d\n",
 843                        LDISKFS_SB(sb)->s_es->s_volume_name, rc);
 844                 GOTO(noenv, rc);
 845         }
 846
 847         rc = osd_scrub_prep(dev);
 848         if (rc != 0) {
 849                 CERROR("%.16s: OI scrub, fail to scrub prep, rc = %d\n",
 850                        LDISKFS_SB(sb)->s_es->s_volume_name, rc);
 851                 GOTO(out, rc);
 852         }
 853
 854         if (!scrub->os_full_speed) {
 855                 struct l_wait_info lwi = { 0 };
 856                 struct osd_otable_it *it = dev->od_otable_it;
 857                 struct osd_otable_cache *ooc = &it->ooi_cache;
 858
 859                 l_wait_event(thread->t_ctl_waitq,
 860                              it->ooi_user_ready || !thread_is_running(thread),
 861                              &lwi);
 862                 if (unlikely(!thread_is_running(thread)))
 863                         GOTO(post, rc = 0);
 864
 865                 LASSERT(scrub->os_pos_current >= ooc->ooc_pos_preload);
 866                 scrub->os_pos_current = ooc->ooc_pos_preload;
 867         }
 868
 869         CDEBUG(D_LFSCK, "OI scrub: flags = 0x%x, pos = %u\n",
 870                scrub->os_start_flags, scrub->os_pos_current);
 871
 872         rc = osd_inode_iteration(osd_oti_get(&env), dev, ~0U, 0);
 873         if (unlikely(rc == SCRUB_IT_CRASH))
 874                 GOTO(out, rc = -EINVAL);
 875         GOTO(post, rc);
 876
 877 post:
 878         osd_scrub_post(scrub, rc);
 879         CDEBUG(D_LFSCK, "OI scrub: stop, rc = %d, pos = %u\n",
 880                rc, scrub->os_pos_current);
 881
 882 out:
 883         while (!cfs_list_empty(&scrub->os_inconsistent_items)) {
 884                 struct osd_inconsistent_item *oii;
 885
 886                 oii = cfs_list_entry(scrub->os_inconsistent_items.next,
 887                                      struct osd_inconsistent_item, oii_list);
 888                 cfs_list_del_init(&oii->oii_list);
 889                 OBD_FREE_PTR(oii);
 890         }
 891         lu_env_fini(&env);
 892
 893 noenv:
 894         cfs_spin_lock(&scrub->os_lock);
 895         thread_set_flags(thread, SVC_STOPPED);
 896         cfs_waitq_broadcast(&thread->t_ctl_waitq);
 897         cfs_spin_unlock(&scrub->os_lock);
 898         return rc;
 899 }
 900
 901 static int do_osd_scrub_start(struct osd_device *dev, __u32 flags)
 902 {
 903         struct osd_scrub     *scrub  = &dev->od_scrub;
 904         struct ptlrpc_thread *thread = &scrub->os_thread;
 905         struct l_wait_info    lwi    = { 0 };
 906         int                   rc;
 907         ENTRY;
 908
 909 again:
 910         /* os_lock: sync status between stop and scrub thread */
 911         cfs_spin_lock(&scrub->os_lock);
 912         if (thread_is_running(thread)) {
 913                 cfs_spin_unlock(&scrub->os_lock);
 914                 RETURN(-EALREADY);
 915         } else if (unlikely(thread_is_stopping(thread))) {
 916                 cfs_spin_unlock(&scrub->os_lock);
 917                 l_wait_event(thread->t_ctl_waitq,
 918                              thread_is_stopped(thread),
 919                              &lwi);
 920                 goto again;
 921         }
 922         cfs_spin_unlock(&scrub->os_lock);
 923
 924         scrub->os_start_flags = flags;
 925         thread_set_flags(thread, 0);
 926         rc = cfs_create_thread(osd_scrub_main, dev, 0);
 927         if (rc < 0) {
 928                 CERROR("%.16s: cannot start iteration thread, rc = %d\n",
 929                        LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name, rc);
 930                 RETURN(rc);
 931         }
 932
 933         l_wait_event(thread->t_ctl_waitq,
 934                      thread_is_running(thread) || thread_is_stopped(thread),
 935                      &lwi);
 936
 937         RETURN(0);
 938 }
 939
 940 int osd_scrub_start(struct osd_device *dev)
 941 {
 942         __u32 flags = SS_AUTO;
 943         int   rc;
 944         ENTRY;
 945
 946         if (dev->od_scrub.os_file.sf_status == SS_COMPLETED)
 947                 flags |= SS_RESET;
 948
 949         /* od_otable_mutex: prevent curcurrent start/stop */
 950         cfs_mutex_lock(&dev->od_otable_mutex);
 951         rc = do_osd_scrub_start(dev, flags);
 952         cfs_mutex_unlock(&dev->od_otable_mutex);
 953
 954         RETURN(rc == -EALREADY ? 0 : rc);
 955 }
 956
 957 static void do_osd_scrub_stop(struct osd_scrub *scrub)
 958 {
 959         struct ptlrpc_thread *thread = &scrub->os_thread;
 960         struct l_wait_info    lwi    = { 0 };
 961
 962         /* os_lock: sync status between stop and scrub thread */
 963         cfs_spin_lock(&scrub->os_lock);
 964         if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
 965                 thread_set_flags(thread, SVC_STOPPING);
 966                 cfs_spin_unlock(&scrub->os_lock);
 967                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
 968                 l_wait_event(thread->t_ctl_waitq,
 969                              thread_is_stopped(thread),
 970                              &lwi);
 971                 /* Do not skip the last lock/unlock, which can guarantee that
 972                  * the caller cannot return until the OI scrub thread exit. */
 973                 cfs_spin_lock(&scrub->os_lock);
 974         }
 975         cfs_spin_unlock(&scrub->os_lock);
 976 }
 977
 978 static void osd_scrub_stop(struct osd_device *dev)
 979 {
 980         /* od_otable_mutex: prevent curcurrent start/stop */
 981         cfs_mutex_lock(&dev->od_otable_mutex);
 982         do_osd_scrub_stop(&dev->od_scrub);
 983         cfs_mutex_unlock(&dev->od_otable_mutex);
 984 }
 985
 986 static const char osd_scrub_name[] = "OI_scrub";
 987
 988 int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
 989 {
 990         struct osd_thread_info     *info   = osd_oti_get(env);
 991         struct osd_scrub           *scrub  = &dev->od_scrub;
 992         struct lvfs_run_ctxt       *ctxt   = &scrub->os_ctxt;
 993         struct scrub_file          *sf     = &scrub->os_file;
 994         struct osd_inode_id        *id     = &scrub->os_oic.oic_lid;
 995         struct super_block         *sb     = osd_sb(dev);
 996         struct ldiskfs_super_block *es     = LDISKFS_SB(sb)->s_es;
 997         struct inode               *inode;
 998         struct lvfs_run_ctxt        saved;
 999         struct file                *filp;
1000         int                         dirty  = 0;
1001         int                         init   = 0;
1002         int                         rc     = 0;
1003         ENTRY;
1004
1005         OBD_SET_CTXT_MAGIC(ctxt);
1006         ctxt->pwdmnt = dev->od_mnt;
1007         ctxt->pwd = dev->od_mnt->mnt_root;
1008         ctxt->fs = get_ds();
1009
1010         cfs_waitq_init(&scrub->os_thread.t_ctl_waitq);
1011         cfs_init_rwsem(&scrub->os_rwsem);
1012         cfs_spin_lock_init(&scrub->os_lock);
1013         CFS_INIT_LIST_HEAD(&scrub->os_inconsistent_items);
1014         if (get_mount_flags(dev->od_mount->lmi_sb) & LMD_FLG_NOSCRUB)
1015                 scrub->os_no_scrub = 1;
1016
1017         push_ctxt(&saved, ctxt, NULL);
1018         filp = filp_open(osd_scrub_name, O_RDWR | O_CREAT, 0644);
1019         if (IS_ERR(filp))
1020                 RETURN(PTR_ERR(filp));
1021
1022         scrub->os_inode = igrab(filp->f_dentry->d_inode);
1023         filp_close(filp, 0);
1024         pop_ctxt(&saved, ctxt, NULL);
1025
1026         rc = osd_scrub_file_load(scrub);
1027         if (rc == -ENOENT) {
1028                 osd_scrub_file_init(scrub, es->s_uuid);
1029                 dirty = 1;
1030                 init = 1;
1031         } else if (rc != 0) {
1032                 RETURN(rc);
1033         } else {
1034                 if (memcmp(sf->sf_uuid, es->s_uuid, 16) != 0) {
1035                         osd_scrub_file_reset(scrub, es->s_uuid,SF_INCONSISTENT);
1036                         dirty = 1;
1037                 } else if (sf->sf_status == SS_SCANNING) {
1038                         sf->sf_status = SS_CRASHED;
1039                         dirty = 1;
1040                 }
1041         }
1042
1043         if (sf->sf_pos_last_checkpoint != 0)
1044                 scrub->os_pos_current = sf->sf_pos_last_checkpoint + 1;
1045         else
1046                 scrub->os_pos_current = LDISKFS_FIRST_INO(sb);
1047
1048         if (dirty != 0) {
1049                 rc = osd_scrub_file_store(scrub);
1050                 if (rc != 0)
1051                         RETURN(rc);
1052         }
1053
1054         /* Initialize OI files. */
1055         rc = osd_oi_init(info, dev);
1056         if (rc < 0)
1057                 RETURN(rc);
1058
1059         if (init != 0) {
1060                 rc = __osd_oi_lookup(info, dev, &LU_DOT_LUSTRE_FID, id);
1061                 if (rc == 0) {
1062                         inode = osd_iget(info, dev, id);
1063                         if (IS_ERR(inode)) {
1064                                 rc = PTR_ERR(inode);
1065                                 /* It is restored from old 2.x backup. */
1066                                 if (rc == -ENOENT || rc == -ESTALE) {
1067                                         osd_scrub_file_reset(scrub, es->s_uuid,
1068                                                              SF_INCONSISTENT);
1069                                         rc = osd_scrub_file_store(scrub);
1070                                 }
1071                         } else {
1072                                 iput(inode);
1073                         }
1074                 } else if (rc == -ENOENT) {
1075                         rc = 0;
1076                 }
1077         }
1078
1079         if (rc == 0 && !scrub->os_no_scrub &&
1080             ((sf->sf_status == SS_CRASHED &&
1081               sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT | SF_AUTO)) ||
1082              (sf->sf_status == SS_INIT &&
1083               sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT))))
1084                 rc = osd_scrub_start(dev);
1085
1086         RETURN(rc);
1087 }
1088
1089 void osd_scrub_cleanup(const struct lu_env *env, struct osd_device *dev)
1090 {
1091         struct osd_scrub *scrub = &dev->od_scrub;
1092
1093         LASSERT(dev->od_otable_it == NULL);
1094
1095         if (scrub->os_inode != NULL) {
1096                 osd_scrub_stop(dev);
1097                 iput(scrub->os_inode);
1098                 scrub->os_inode = NULL;
1099         }
1100         if (dev->od_oi_table != NULL)
1101                 osd_oi_fini(osd_oti_get(env), dev);
1102 }
1103
1104 static struct dt_it *osd_otable_it_init(const struct lu_env *env,
1105                                        struct dt_object *dt, __u32 attr,
1106                                        struct lustre_capa *capa)
1107 {
1108         enum dt_otable_it_flags flags = attr >> DT_OTABLE_IT_FLAGS_SHIFT;
1109         enum dt_otable_it_valid valid = attr & ~DT_OTABLE_IT_FLAGS_MASK;
1110         struct osd_device      *dev   = osd_dev(dt->do_lu.lo_dev);
1111         struct osd_scrub       *scrub = &dev->od_scrub;
1112         struct osd_otable_it   *it;
1113         __u32                   start = 0;
1114         int                     rc;
1115         ENTRY;
1116
1117         /* od_otable_mutex: prevent curcurrent init/fini */
1118         cfs_mutex_lock(&dev->od_otable_mutex);
1119         if (dev->od_otable_it != NULL)
1120                 GOTO(out, it = ERR_PTR(-EALREADY));
1121
1122         OBD_ALLOC_PTR(it);
1123         if (it == NULL)
1124                 GOTO(out, it = ERR_PTR(-ENOMEM));
1125
1126         dev->od_otable_it = it;
1127         it->ooi_dev = dev;
1128         it->ooi_cache.ooc_consumer_idx = -1;
1129         if (flags & DOIF_OUTUSED)
1130                 it->ooi_used_outside = 1;
1131
1132         if (flags & DOIF_RESET)
1133                 start |= SS_RESET;
1134
1135         if (valid & DOIV_ERROR_HANDLE) {
1136                 if (flags & DOIF_FAILOUT)
1137                         start |= SS_SET_FAILOUT;
1138                 else
1139                         start |= SS_CLEAR_FAILOUT;
1140         }
1141
1142         rc = do_osd_scrub_start(dev, start);
1143         if (rc == -EALREADY) {
1144                 it->ooi_cache.ooc_pos_preload = scrub->os_pos_current - 1;
1145         } else if (rc < 0) {
1146                 dev->od_otable_it = NULL;
1147                 OBD_FREE_PTR(it);
1148                 GOTO(out, it = ERR_PTR(-EALREADY));
1149         } else {
1150                 it->ooi_cache.ooc_pos_preload = scrub->os_pos_current;
1151         }
1152
1153         GOTO(out, it);
1154
1155 out:
1156         cfs_mutex_unlock(&dev->od_otable_mutex);
1157         return (struct dt_it *)it;
1158 }
1159
1160 static void osd_otable_it_fini(const struct lu_env *env, struct dt_it *di)
1161 {
1162         struct osd_otable_it *it  = (struct osd_otable_it *)di;
1163         struct osd_device    *dev = it->ooi_dev;
1164
1165         /* od_otable_mutex: prevent curcurrent init/fini */
1166         cfs_mutex_lock(&dev->od_otable_mutex);
1167         do_osd_scrub_stop(&dev->od_scrub);
1168         LASSERT(dev->od_otable_it == it);
1169
1170         dev->od_otable_it = NULL;
1171         cfs_mutex_unlock(&dev->od_otable_mutex);
1172         OBD_FREE_PTR(it);
1173 }
1174
1175 /**
1176  * Set the OSD layer iteration start position as the specified key.
1177  *
1178  * The LFSCK out of OSD layer does not know the detail of the key, so if there
1179  * are several keys, they cannot be compared out of OSD, so call "::get()" for
1180  * each key, and OSD will select the smallest one by itself.
1181  */
1182 static int osd_otable_it_get(const struct lu_env *env,
1183                              struct dt_it *di, const struct dt_key *key)
1184 {
1185         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
1186         struct osd_otable_cache *ooc = &it->ooi_cache;
1187         const char              *str = (const char *)key;
1188         __u32                    ino;
1189         ENTRY;
1190
1191         /* Forbid to set iteration position after iteration started. */
1192         if (it->ooi_user_ready)
1193                 RETURN(-EPERM);
1194
1195         if (str[0] == '\0')
1196                 RETURN(-EINVAL);
1197
1198         if (sscanf(str, "%u", &ino) <= 0)
1199                 RETURN(-EINVAL);
1200
1201         /* Skip the one that has been processed last time. */
1202         if (ooc->ooc_pos_preload > ++ino)
1203                 ooc->ooc_pos_preload = ino;
1204
1205         RETURN(0);
1206 }
1207
1208 static int osd_otable_it_preload(const struct lu_env *env,
1209                                  struct osd_otable_it *it)
1210 {
1211         struct osd_device       *dev   = it->ooi_dev;
1212         struct osd_scrub        *scrub = &dev->od_scrub;
1213         struct osd_otable_cache *ooc   = &it->ooi_cache;
1214         int                      rc;
1215         ENTRY;
1216
1217         rc = osd_inode_iteration(osd_oti_get(env), dev,
1218                                  OSD_OTABLE_IT_CACHE_SIZE, 1);
1219         if (rc == SCRUB_IT_ALL)
1220                 it->ooi_all_cached = 1;
1221
1222         CDEBUG(D_LFSCK, "OSD pre-loaded: max = %u, preload = %u, rc = %d\n",
1223                le32_to_cpu(LDISKFS_SB(osd_sb(dev))->s_es->s_inodes_count),
1224                ooc->ooc_pos_preload, rc);
1225
1226         if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
1227                 scrub->os_waiting = 0;
1228                 cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
1229         }
1230
1231         RETURN(rc < 0 ? rc : ooc->ooc_cached_items);
1232 }
1233
1234 static int osd_otable_it_next(const struct lu_env *env, struct dt_it *di)
1235 {
1236         struct osd_otable_it    *it     = (struct osd_otable_it *)di;
1237         struct osd_device       *dev    = it->ooi_dev;
1238         struct osd_scrub        *scrub  = &dev->od_scrub;
1239         struct osd_otable_cache *ooc    = &it->ooi_cache;
1240         struct ptlrpc_thread    *thread = &scrub->os_thread;
1241         struct l_wait_info       lwi    = { 0 };
1242         int                      rc;
1243         ENTRY;
1244
1245         LASSERT(it->ooi_user_ready);
1246
1247 again:
1248         if (!thread_is_running(thread) && !it->ooi_used_outside)
1249                 RETURN(1);
1250
1251         if (ooc->ooc_cached_items > 0) {
1252                 ooc->ooc_cached_items--;
1253                 ooc->ooc_consumer_idx = (ooc->ooc_consumer_idx + 1) &
1254                                         ~OSD_OTABLE_IT_CACHE_MASK;
1255                 RETURN(0);
1256         }
1257
1258         if (it->ooi_all_cached) {
1259                 l_wait_event(thread->t_ctl_waitq,
1260                              !thread_is_running(thread),
1261                              &lwi);
1262                 RETURN(1);
1263         }
1264
1265         it->ooi_waiting = 1;
1266         l_wait_event(thread->t_ctl_waitq,
1267                      ooc->ooc_pos_preload < scrub->os_pos_current ||
1268                      !thread_is_running(thread),
1269                      &lwi);
1270         it->ooi_waiting = 0;
1271
1272         if (!thread_is_running(thread) && !it->ooi_used_outside)
1273                 RETURN(1);
1274
1275         rc = osd_otable_it_preload(env, it);
1276         if (rc >= 0)
1277                 goto again;
1278
1279         RETURN(rc);
1280 }
1281
1282 static struct dt_key *osd_otable_it_key(const struct lu_env *env,
1283                                         const struct dt_it *di)
1284 {
1285         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
1286         struct osd_otable_cache *ooc = &it->ooi_cache;
1287
1288         sprintf(it->ooi_key, "%u",
1289                 ooc->ooc_cache[ooc->ooc_consumer_idx].oic_lid.oii_ino);
1290         return (struct dt_key *)it->ooi_key;
1291 }
1292
1293 static int osd_otable_it_key_size(const struct lu_env *env,
1294                                   const struct dt_it *di)
1295 {
1296         return sizeof(((struct osd_otable_it *)di)->ooi_key);
1297 }
1298
1299 static int osd_otable_it_rec(const struct lu_env *env, const struct dt_it *di,
1300                              struct dt_rec *rec, __u32 attr)
1301 {
1302         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
1303         struct osd_otable_cache *ooc = &it->ooi_cache;
1304
1305         *(struct lu_fid *)rec = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_fid;
1306         return 0;
1307 }
1308
1309 static int osd_otable_it_load(const struct lu_env *env,
1310                               const struct dt_it *di, __u64 hash)
1311 {
1312         struct osd_otable_it    *it    = (struct osd_otable_it *)di;
1313         struct osd_device       *dev   = it->ooi_dev;
1314         struct osd_otable_cache *ooc   = &it->ooi_cache;
1315         struct osd_scrub        *scrub = &dev->od_scrub;
1316
1317         if (it->ooi_user_ready)
1318                 return 0;
1319
1320         if (ooc->ooc_pos_preload < LDISKFS_FIRST_INO(osd_sb(dev)))
1321                 ooc->ooc_pos_preload = LDISKFS_FIRST_INO(osd_sb(dev));
1322         it->ooi_user_ready = 1;
1323         if (!scrub->os_full_speed)
1324                 cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
1325
1326         /* Unplug OSD layer iteration by the first next() call. */
1327         return osd_otable_it_next(env, (struct dt_it *)it);
1328 }
1329
1330 const struct dt_index_operations osd_otable_ops = {
1331         .dio_it = {
1332                 .init     = osd_otable_it_init,
1333                 .fini     = osd_otable_it_fini,
1334                 .get      = osd_otable_it_get,
1335                 .next     = osd_otable_it_next,
1336                 .key      = osd_otable_it_key,
1337                 .key_size = osd_otable_it_key_size,
1338                 .rec      = osd_otable_it_rec,
1339                 .load     = osd_otable_it_load,
1340         }
1341 };
1342
1343 int osd_oii_insert(struct osd_device *dev, struct osd_idmap_cache *oic,
1344                    int insert)
1345 {
1346         struct osd_inconsistent_item *oii;
1347         struct osd_scrub             *scrub  = &dev->od_scrub;
1348         struct ptlrpc_thread         *thread = &scrub->os_thread;
1349         int                           wakeup = 0;
1350         ENTRY;
1351
1352         OBD_ALLOC_PTR(oii);
1353         if (unlikely(oii == NULL))
1354                 RETURN(-ENOMEM);
1355
1356         CFS_INIT_LIST_HEAD(&oii->oii_list);
1357         oii->oii_cache = *oic;
1358         oii->oii_insert = insert;
1359
1360         cfs_spin_lock(&scrub->os_lock);
1361         if (unlikely(!thread_is_running(thread))) {
1362                 cfs_spin_unlock(&scrub->os_lock);
1363                 OBD_FREE_PTR(oii);
1364                 RETURN(-EAGAIN);
1365         }
1366
1367         if (cfs_list_empty(&scrub->os_inconsistent_items))
1368                 wakeup = 1;
1369         cfs_list_add_tail(&oii->oii_list, &scrub->os_inconsistent_items);
1370         cfs_spin_unlock(&scrub->os_lock);
1371
1372         if (wakeup != 0)
1373                 cfs_waitq_broadcast(&thread->t_ctl_waitq);
1374
1375         RETURN(0);
1376 }
1377
1378 int osd_oii_lookup(struct osd_device *dev, const struct lu_fid *fid,
1379                    struct osd_inode_id *id)
1380 {
1381         struct osd_scrub             *scrub = &dev->od_scrub;
1382         struct osd_inconsistent_item *oii;
1383         ENTRY;
1384
1385         cfs_spin_lock(&scrub->os_lock);
1386         cfs_list_for_each_entry(oii, &scrub->os_inconsistent_items, oii_list) {
1387                 if (lu_fid_eq(fid, &oii->oii_cache.oic_fid)) {
1388                         *id = oii->oii_cache.oic_lid;
1389                         cfs_spin_unlock(&scrub->os_lock);
1390                         RETURN(0);
1391                 }
1392         }
1393         cfs_spin_unlock(&scrub->os_lock);
1394
1395         RETURN(-ENOENT);
1396 }
1397
1398 static const char *scrub_status_names[] = {
1399         "init",
1400         "scanning",
1401         "completed",
1402         "failed",
1403         "paused",
1404         "crashed",
1405         NULL
1406 };
1407
1408 static const char *scrub_flags_names[] = {
1409         "recreated",
1410         "inconsistent",
1411         "auto",
1412         NULL
1413 };
1414
1415 static const char *scrub_param_names[] = {
1416         "failout",
1417         NULL
1418 };
1419
1420 static int scrub_bits_dump(char **buf, int *len, int bits, const char *names[],
1421                            const char *prefix)
1422 {
1423         int save = *len;
1424         int flag;
1425         int rc;
1426         int i;
1427
1428         rc = snprintf(*buf, *len, "%s:%c", prefix, bits != 0 ? ' ' : '\n');
1429         if (rc <= 0)
1430                 return -ENOSPC;
1431
1432         *buf += rc;
1433         *len -= rc;
1434         for (i = 0, flag = 1; bits != 0; i++, flag = 1 << i) {
1435                 if (flag & bits) {
1436                         bits &= ~flag;
1437                         rc = snprintf(*buf, *len, "%s%c", names[i],
1438                                       bits != 0 ? ',' : '\n');
1439                         if (rc <= 0)
1440                                 return -ENOSPC;
1441
1442                         *buf += rc;
1443                         *len -= rc;
1444                 }
1445         }
1446         return save - *len;
1447 }
1448
1449 static int scrub_time_dump(char **buf, int *len, __u64 time, const char *prefix)
1450 {
1451         int rc;
1452
1453         if (time != 0)
1454                 rc = snprintf(*buf, *len, "%s: "LPU64" seconds\n", prefix,
1455                               cfs_time_current_sec() - time);
1456         else
1457                 rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
1458         if (rc <= 0)
1459                 return -ENOSPC;
1460
1461         *buf += rc;
1462         *len -= rc;
1463         return rc;
1464 }
1465
1466 static int scrub_pos_dump(char **buf, int *len, __u64 pos, const char *prefix)
1467 {
1468         int rc;
1469
1470         if (pos != 0)
1471                 rc = snprintf(*buf, *len, "%s: "LPU64"\n", prefix, pos);
1472         else
1473                 rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
1474         if (rc <= 0)
1475                 return -ENOSPC;
1476
1477         *buf += rc;
1478         *len -= rc;
1479         return rc;
1480 }
1481
1482 int osd_scrub_dump(struct osd_device *dev, char *buf, int len)
1483 {
1484         struct osd_scrub  *scrub   = &dev->od_scrub;
1485         struct scrub_file *sf      = &scrub->os_file;
1486         __u64              checked;
1487         __u64              speed;
1488         int                save    = len;
1489         int                ret     = -ENOSPC;
1490         int                rc;
1491
1492         cfs_down_read(&scrub->os_rwsem);
1493         rc = snprintf(buf, len,
1494                       "name: OI scrub\n"
1495                       "magic: 0x%x\n"
1496                       "oi_files: %d\n"
1497                       "status: %s\n",
1498                       sf->sf_magic, (int)sf->sf_oi_count,
1499                       scrub_status_names[sf->sf_status]);
1500         if (rc <= 0)
1501                 goto out;
1502
1503         buf += rc;
1504         len -= rc;
1505         rc = scrub_bits_dump(&buf, &len, sf->sf_flags, scrub_flags_names,
1506                              "flags");
1507         if (rc < 0)
1508                 goto out;
1509
1510         rc = scrub_bits_dump(&buf, &len, sf->sf_param, scrub_param_names,
1511                              "param");
1512         if (rc < 0)
1513                 goto out;
1514
1515         rc = scrub_time_dump(&buf, &len, sf->sf_time_last_complete,
1516                              "time_since_last_completed");
1517         if (rc < 0)
1518                 goto out;
1519
1520         rc = scrub_time_dump(&buf, &len, sf->sf_time_latest_start,
1521                              "time_since_latest_start");
1522         if (rc < 0)
1523                 goto out;
1524
1525         rc = scrub_time_dump(&buf, &len, sf->sf_time_last_checkpoint,
1526                              "time_since_last_checkpoint");
1527         if (rc < 0)
1528                 goto out;
1529
1530         rc = scrub_pos_dump(&buf, &len, sf->sf_pos_latest_start,
1531                             "latest_start_position");
1532         if (rc < 0)
1533                 goto out;
1534
1535         rc = scrub_pos_dump(&buf, &len, sf->sf_pos_last_checkpoint,
1536                             "last_checkpoint_position");
1537         if (rc < 0)
1538                 goto out;
1539
1540         rc = scrub_pos_dump(&buf, &len, sf->sf_pos_first_inconsistent,
1541                             "first_failure_position");
1542         if (rc < 0)
1543                 goto out;
1544
1545         checked = sf->sf_items_checked + scrub->os_new_checked;
1546         rc = snprintf(buf, len,
1547                       "checked: "LPU64"\n"
1548                       "updated: "LPU64"\n"
1549                       "failed: "LPU64"\n"
1550                       "prior_updated: "LPU64"\n"
1551                       "success_count: %u\n",
1552                       checked, sf->sf_items_updated, sf->sf_items_failed,
1553                       sf->sf_items_updated_prior, sf->sf_success_count);
1554         if (rc <= 0)
1555                 goto out;
1556
1557         buf += rc;
1558         len -= rc;
1559         speed = checked;
1560         if (thread_is_running(&scrub->os_thread)) {
1561                 cfs_duration_t duration = cfs_time_current() -
1562                                           scrub->os_time_last_checkpoint;
1563                 __u64 new_checked = scrub->os_new_checked * CFS_HZ;
1564                 __u32 rtime = sf->sf_run_time +
1565                               cfs_duration_sec(duration + HALF_SEC);
1566
1567                 if (duration != 0)
1568                         do_div(new_checked, duration);
1569                 if (rtime != 0)
1570                         do_div(speed, rtime);
1571                 rc = snprintf(buf, len,
1572                               "run_time: %u seconds\n"
1573                               "average_speed: "LPU64" objects/sec\n"
1574                               "real-time_speed: "LPU64" objects/sec\n"
1575                               "current_position: %u\n",
1576                               rtime, speed, new_checked, scrub->os_pos_current);
1577         } else {
1578                 if (sf->sf_run_time != 0)
1579                         do_div(speed, sf->sf_run_time);
1580                 rc = snprintf(buf, len,
1581                               "run_time: %u seconds\n"
1582                               "average_speed: "LPU64" objects/sec\n"
1583                               "real-time_speed: N/A\n"
1584                               "current_position: N/A\n",
1585                               sf->sf_run_time, speed);
1586         }
1587         if (rc <= 0)
1588                 goto out;
1589
1590         buf += rc;
1591         len -= rc;
1592         ret = save - len;
1593
1594 out:
1595         cfs_up_read(&scrub->os_rwsem);
1596         return ret;
1597 }