lustre/lfsck/lfsck_namespace.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/lfsck/lfsck_namespace.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #define DEBUG_SUBSYSTEM S_LFSCK
  32
  33 #include <lustre/lustre_idl.h>
  34 #include <lu_object.h>
  35 #include <dt_object.h>
  36 #include <md_object.h>
  37 #include <lustre_linkea.h>
  38 #include <lustre_fid.h>
  39 #include <lustre_lib.h>
  40 #include <lustre_net.h>
  41 #include <lustre/lustre_user.h>
  42
  43 #include "lfsck_internal.h"
  44
  45 #define LFSCK_NAMESPACE_MAGIC   0xA0629D03
  46
  47 static const char lfsck_namespace_name[] = "lfsck_namespace";
  48
  49 static void lfsck_namespace_le_to_cpu(struct lfsck_namespace *des,
  50                                       struct lfsck_namespace *src)
  51 {
  52         des->ln_magic = le32_to_cpu(src->ln_magic);
  53         des->ln_status = le32_to_cpu(src->ln_status);
  54         des->ln_flags = le32_to_cpu(src->ln_flags);
  55         des->ln_success_count = le32_to_cpu(src->ln_success_count);
  56         des->ln_run_time_phase1 = le32_to_cpu(src->ln_run_time_phase1);
  57         des->ln_run_time_phase2 = le32_to_cpu(src->ln_run_time_phase2);
  58         des->ln_time_last_complete = le64_to_cpu(src->ln_time_last_complete);
  59         des->ln_time_latest_start = le64_to_cpu(src->ln_time_latest_start);
  60         des->ln_time_last_checkpoint =
  61                                 le64_to_cpu(src->ln_time_last_checkpoint);
  62         lfsck_position_le_to_cpu(&des->ln_pos_latest_start,
  63                                  &src->ln_pos_latest_start);
  64         lfsck_position_le_to_cpu(&des->ln_pos_last_checkpoint,
  65                                  &src->ln_pos_last_checkpoint);
  66         lfsck_position_le_to_cpu(&des->ln_pos_first_inconsistent,
  67                                  &src->ln_pos_first_inconsistent);
  68         des->ln_items_checked = le64_to_cpu(src->ln_items_checked);
  69         des->ln_items_repaired = le64_to_cpu(src->ln_items_repaired);
  70         des->ln_items_failed = le64_to_cpu(src->ln_items_failed);
  71         des->ln_dirs_checked = le64_to_cpu(src->ln_dirs_checked);
  72         des->ln_mlinked_checked = le64_to_cpu(src->ln_mlinked_checked);
  73         des->ln_objs_checked_phase2 = le64_to_cpu(src->ln_objs_checked_phase2);
  74         des->ln_objs_repaired_phase2 =
  75                                 le64_to_cpu(src->ln_objs_repaired_phase2);
  76         des->ln_objs_failed_phase2 = le64_to_cpu(src->ln_objs_failed_phase2);
  77         des->ln_objs_nlink_repaired = le64_to_cpu(src->ln_objs_nlink_repaired);
  78         des->ln_objs_lost_found = le64_to_cpu(src->ln_objs_lost_found);
  79         fid_le_to_cpu(&des->ln_fid_latest_scanned_phase2,
  80                       &src->ln_fid_latest_scanned_phase2);
  81 }
  82
  83 static void lfsck_namespace_cpu_to_le(struct lfsck_namespace *des,
  84                                       struct lfsck_namespace *src)
  85 {
  86         des->ln_magic = cpu_to_le32(src->ln_magic);
  87         des->ln_status = cpu_to_le32(src->ln_status);
  88         des->ln_flags = cpu_to_le32(src->ln_flags);
  89         des->ln_success_count = cpu_to_le32(src->ln_success_count);
  90         des->ln_run_time_phase1 = cpu_to_le32(src->ln_run_time_phase1);
  91         des->ln_run_time_phase2 = cpu_to_le32(src->ln_run_time_phase2);
  92         des->ln_time_last_complete = cpu_to_le64(src->ln_time_last_complete);
  93         des->ln_time_latest_start = cpu_to_le64(src->ln_time_latest_start);
  94         des->ln_time_last_checkpoint =
  95                                 cpu_to_le64(src->ln_time_last_checkpoint);
  96         lfsck_position_cpu_to_le(&des->ln_pos_latest_start,
  97                                  &src->ln_pos_latest_start);
  98         lfsck_position_cpu_to_le(&des->ln_pos_last_checkpoint,
  99                                  &src->ln_pos_last_checkpoint);
 100         lfsck_position_cpu_to_le(&des->ln_pos_first_inconsistent,
 101                                  &src->ln_pos_first_inconsistent);
 102         des->ln_items_checked = cpu_to_le64(src->ln_items_checked);
 103         des->ln_items_repaired = cpu_to_le64(src->ln_items_repaired);
 104         des->ln_items_failed = cpu_to_le64(src->ln_items_failed);
 105         des->ln_dirs_checked = cpu_to_le64(src->ln_dirs_checked);
 106         des->ln_mlinked_checked = cpu_to_le64(src->ln_mlinked_checked);
 107         des->ln_objs_checked_phase2 = cpu_to_le64(src->ln_objs_checked_phase2);
 108         des->ln_objs_repaired_phase2 =
 109                                 cpu_to_le64(src->ln_objs_repaired_phase2);
 110         des->ln_objs_failed_phase2 = cpu_to_le64(src->ln_objs_failed_phase2);
 111         des->ln_objs_nlink_repaired = cpu_to_le64(src->ln_objs_nlink_repaired);
 112         des->ln_objs_lost_found = cpu_to_le64(src->ln_objs_lost_found);
 113         fid_cpu_to_le(&des->ln_fid_latest_scanned_phase2,
 114                       &src->ln_fid_latest_scanned_phase2);
 115 }
 116
 117 /**
 118  * \retval +ve: the lfsck_namespace is broken, the caller should reset it.
 119  * \retval 0: succeed.
 120  * \retval -ve: failed cases.
 121  */
 122 static int lfsck_namespace_load(const struct lu_env *env,
 123                                 struct lfsck_component *com)
 124 {
 125         int len = com->lc_file_size;
 126         int rc;
 127
 128         rc = dt_xattr_get(env, com->lc_obj,
 129                           lfsck_buf_get(env, com->lc_file_disk, len),
 130                           XATTR_NAME_LFSCK_NAMESPACE, BYPASS_CAPA);
 131         if (rc == len) {
 132                 struct lfsck_namespace *ns = com->lc_file_ram;
 133
 134                 lfsck_namespace_le_to_cpu(ns,
 135                                 (struct lfsck_namespace *)com->lc_file_disk);
 136                 if (ns->ln_magic != LFSCK_NAMESPACE_MAGIC) {
 137                         CWARN("%s: invalid lfsck_namespace magic %#x != %#x\n",
 138                               lfsck_lfsck2name(com->lc_lfsck), ns->ln_magic,
 139                               LFSCK_NAMESPACE_MAGIC);
 140                         rc = 1;
 141                 } else {
 142                         rc = 0;
 143                 }
 144         } else if (rc != -ENODATA) {
 145                 CERROR("%s: fail to load lfsck_namespace: expected = %d, "
 146                        "rc = %d\n", lfsck_lfsck2name(com->lc_lfsck), len, rc);
 147                 if (rc >= 0)
 148                         rc = 1;
 149         }
 150         return rc;
 151 }
 152
 153 static int lfsck_namespace_store(const struct lu_env *env,
 154                                  struct lfsck_component *com, bool init)
 155 {
 156         struct dt_object        *obj    = com->lc_obj;
 157         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 158         struct thandle          *handle;
 159         int                      len    = com->lc_file_size;
 160         int                      rc;
 161         ENTRY;
 162
 163         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 164                                   (struct lfsck_namespace *)com->lc_file_ram);
 165         handle = dt_trans_create(env, lfsck->li_bottom);
 166         if (IS_ERR(handle)) {
 167                 rc = PTR_ERR(handle);
 168                 CERROR("%s: fail to create trans for storing lfsck_namespace: "
 169                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 170                 RETURN(rc);
 171         }
 172
 173         rc = dt_declare_xattr_set(env, obj,
 174                                   lfsck_buf_get(env, com->lc_file_disk, len),
 175                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 176         if (rc != 0) {
 177                 CERROR("%s: fail to declare trans for storing lfsck_namespace: "
 178                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 179                 GOTO(out, rc);
 180         }
 181
 182         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 183         if (rc != 0) {
 184                 CERROR("%s: fail to start trans for storing lfsck_namespace: "
 185                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 186                 GOTO(out, rc);
 187         }
 188
 189         rc = dt_xattr_set(env, obj,
 190                           lfsck_buf_get(env, com->lc_file_disk, len),
 191                           XATTR_NAME_LFSCK_NAMESPACE,
 192                           init ? LU_XATTR_CREATE : LU_XATTR_REPLACE,
 193                           handle, BYPASS_CAPA);
 194         if (rc != 0)
 195                 CERROR("%s: fail to store lfsck_namespace: len = %d, "
 196                        "rc = %d\n", lfsck_lfsck2name(lfsck), len, rc);
 197
 198         GOTO(out, rc);
 199
 200 out:
 201         dt_trans_stop(env, lfsck->li_bottom, handle);
 202         return rc;
 203 }
 204
 205 static int lfsck_namespace_init(const struct lu_env *env,
 206                                 struct lfsck_component *com)
 207 {
 208         struct lfsck_namespace *ns = com->lc_file_ram;
 209         int rc;
 210
 211         memset(ns, 0, sizeof(*ns));
 212         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 213         ns->ln_status = LS_INIT;
 214         down_write(&com->lc_sem);
 215         rc = lfsck_namespace_store(env, com, true);
 216         up_write(&com->lc_sem);
 217         return rc;
 218 }
 219
 220 static int lfsck_namespace_lookup(const struct lu_env *env,
 221                                   struct lfsck_component *com,
 222                                   const struct lu_fid *fid, __u8 *flags)
 223 {
 224         struct lu_fid *key = &lfsck_env_info(env)->lti_fid;
 225         int            rc;
 226
 227         fid_cpu_to_be(key, fid);
 228         rc = dt_lookup(env, com->lc_obj, (struct dt_rec *)flags,
 229                        (const struct dt_key *)key, BYPASS_CAPA);
 230         return rc;
 231 }
 232
 233 static int lfsck_namespace_delete(const struct lu_env *env,
 234                                   struct lfsck_component *com,
 235                                   const struct lu_fid *fid)
 236 {
 237         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 238         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid;
 239         struct thandle          *handle;
 240         struct dt_object        *obj    = com->lc_obj;
 241         int                      rc;
 242         ENTRY;
 243
 244         handle = dt_trans_create(env, lfsck->li_bottom);
 245         if (IS_ERR(handle))
 246                 RETURN(PTR_ERR(handle));
 247
 248         rc = dt_declare_delete(env, obj, (const struct dt_key *)fid, handle);
 249         if (rc != 0)
 250                 GOTO(out, rc);
 251
 252         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 253         if (rc != 0)
 254                 GOTO(out, rc);
 255
 256         fid_cpu_to_be(key, fid);
 257         rc = dt_delete(env, obj, (const struct dt_key *)key, handle,
 258                        BYPASS_CAPA);
 259
 260         GOTO(out, rc);
 261
 262 out:
 263         dt_trans_stop(env, lfsck->li_bottom, handle);
 264         return rc;
 265 }
 266
 267 static int lfsck_namespace_update(const struct lu_env *env,
 268                                   struct lfsck_component *com,
 269                                   const struct lu_fid *fid,
 270                                   __u8 flags, bool force)
 271 {
 272         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 273         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid;
 274         struct thandle          *handle;
 275         struct dt_object        *obj    = com->lc_obj;
 276         int                      rc;
 277         bool                     exist  = false;
 278         __u8                     tf;
 279         ENTRY;
 280
 281         rc = lfsck_namespace_lookup(env, com, fid, &tf);
 282         if (rc != 0 && rc != -ENOENT)
 283                 RETURN(rc);
 284
 285         if (rc == 0) {
 286                 if (!force || flags == tf)
 287                         RETURN(0);
 288
 289                 exist = true;
 290                 handle = dt_trans_create(env, lfsck->li_bottom);
 291                 if (IS_ERR(handle))
 292                         RETURN(PTR_ERR(handle));
 293
 294                 rc = dt_declare_delete(env, obj, (const struct dt_key *)fid,
 295                                        handle);
 296                 if (rc != 0)
 297                         GOTO(out, rc);
 298         } else {
 299                 handle = dt_trans_create(env, lfsck->li_bottom);
 300                 if (IS_ERR(handle))
 301                         RETURN(PTR_ERR(handle));
 302         }
 303
 304         rc = dt_declare_insert(env, obj, (const struct dt_rec *)&flags,
 305                                (const struct dt_key *)fid, handle);
 306         if (rc != 0)
 307                 GOTO(out, rc);
 308
 309         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 310         if (rc != 0)
 311                 GOTO(out, rc);
 312
 313         fid_cpu_to_be(key, fid);
 314         if (exist) {
 315                 rc = dt_delete(env, obj, (const struct dt_key *)key, handle,
 316                                BYPASS_CAPA);
 317                 if (rc != 0) {
 318                         CERROR("%s: fail to insert "DFID": rc = %d\n",
 319                                lfsck_lfsck2name(com->lc_lfsck), PFID(fid), rc);
 320                         GOTO(out, rc);
 321                 }
 322         }
 323
 324         rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
 325                        (const struct dt_key *)key, handle, BYPASS_CAPA, 1);
 326
 327         GOTO(out, rc);
 328
 329 out:
 330         dt_trans_stop(env, lfsck->li_bottom, handle);
 331         return rc;
 332 }
 333
 334 static int lfsck_namespace_check_exist(const struct lu_env *env,
 335                                        struct lfsck_instance *lfsck,
 336                                        struct dt_object *obj, const char *name)
 337 {
 338         struct dt_object *dir = lfsck->li_obj_dir;
 339         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 340         int               rc;
 341         ENTRY;
 342
 343         if (unlikely(lfsck_is_dead_obj(obj)))
 344                 RETURN(LFSCK_NAMEENTRY_DEAD);
 345
 346         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 347                        (const struct dt_key *)name, BYPASS_CAPA);
 348         if (rc == -ENOENT)
 349                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 350
 351         if (rc < 0)
 352                 RETURN(rc);
 353
 354         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 355                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 356
 357         RETURN(0);
 358 }
 359
 360 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 361                                             struct dt_object *obj,
 362                                             struct thandle *handle)
 363 {
 364         int rc;
 365
 366         /* For destroying all invalid linkEA entries. */
 367         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 368         if (rc != 0)
 369                 return rc;
 370
 371         /* For insert new linkEA entry. */
 372         rc = dt_declare_xattr_set(env, obj,
 373                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 374                         XATTR_NAME_LINK, 0, handle);
 375         return rc;
 376 }
 377
 378 static int lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 379                             struct linkea_data *ldata)
 380 {
 381         int rc;
 382
 383         ldata->ld_buf =
 384                 lu_buf_check_and_alloc(&lfsck_env_info(env)->lti_linkea_buf,
 385                                        PAGE_CACHE_SIZE);
 386         if (ldata->ld_buf->lb_buf == NULL)
 387                 return -ENOMEM;
 388
 389         if (!dt_object_exists(obj))
 390                 return -ENODATA;
 391
 392         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK, BYPASS_CAPA);
 393         if (rc == -ERANGE) {
 394                 /* Buf was too small, figure out what we need. */
 395                 lu_buf_free(ldata->ld_buf);
 396                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
 397                                   BYPASS_CAPA);
 398                 if (rc < 0)
 399                         return rc;
 400
 401                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
 402                 if (ldata->ld_buf->lb_buf == NULL)
 403                         return -ENOMEM;
 404
 405                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
 406                                   BYPASS_CAPA);
 407         }
 408         if (rc < 0)
 409                 return rc;
 410
 411         linkea_init(ldata);
 412
 413         return 0;
 414 }
 415
 416 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 417                              struct linkea_data *ldata, struct thandle *handle)
 418 {
 419         const struct lu_buf *buf = lfsck_buf_get_const(env,
 420                                                        ldata->ld_buf->lb_buf,
 421                                                        ldata->ld_leh->leh_len);
 422
 423         return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle,
 424                             BYPASS_CAPA);
 425 }
 426
 427 /**
 428  * \retval ve: removed entries
 429  */
 430 static int lfsck_linkea_entry_unpack(struct lfsck_instance *lfsck,
 431                                      struct linkea_data *ldata,
 432                                      struct lu_name *cname,
 433                                      struct lu_fid *pfid)
 434 {
 435         struct link_ea_entry    *oldlee;
 436         int                      oldlen;
 437         int                      removed = 0;
 438
 439         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 440         oldlee = ldata->ld_lee;
 441         oldlen = ldata->ld_reclen;
 442         linkea_next_entry(ldata);
 443         while (ldata->ld_lee != NULL) {
 444                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 445                                    ldata->ld_lee->lee_reclen[1];
 446                 if (unlikely(ldata->ld_reclen == oldlen &&
 447                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 448                         linkea_del_buf(ldata, cname);
 449                         removed++;
 450                 } else {
 451                         linkea_next_entry(ldata);
 452                 }
 453         }
 454         ldata->ld_lee = oldlee;
 455         ldata->ld_reclen = oldlen;
 456         return removed;
 457 }
 458
 459 /**
 460  * \retval +ve  repaired
 461  * \retval 0    no need to repair
 462  * \retval -ve  error cases
 463  */
 464 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
 465                                            struct lfsck_component *com,
 466                                            struct dt_object *child, __u8 flags)
 467 {
 468         struct lfsck_thread_info *info    = lfsck_env_info(env);
 469         struct lu_attr           *la      = &info->lti_la;
 470         struct lu_name           *cname   = &info->lti_name;
 471         struct lu_fid            *pfid    = &info->lti_fid;
 472         struct lu_fid            *cfid    = &info->lti_fid2;
 473         struct lfsck_instance   *lfsck    = com->lc_lfsck;
 474         struct lfsck_bookmark   *bk       = &lfsck->li_bookmark_ram;
 475         struct lfsck_namespace  *ns       = com->lc_file_ram;
 476         struct linkea_data       ldata    = { 0 };
 477         struct thandle          *handle   = NULL;
 478         bool                     locked   = false;
 479         bool                     update   = false;
 480         int                      rc;
 481         ENTRY;
 482
 483         if (com->lc_journal) {
 484
 485 again:
 486                 LASSERT(!locked);
 487
 488                 update = false;
 489                 com->lc_journal = 1;
 490                 handle = dt_trans_create(env, lfsck->li_next);
 491                 if (IS_ERR(handle))
 492                         RETURN(rc = PTR_ERR(handle));
 493
 494                 rc = dt_declare_xattr_set(env, child,
 495                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 496                         XATTR_NAME_LINK, 0, handle);
 497                 if (rc != 0)
 498                         GOTO(stop, rc);
 499
 500                 rc = dt_trans_start(env, lfsck->li_next, handle);
 501                 if (rc != 0)
 502                         GOTO(stop, rc);
 503
 504                 dt_write_lock(env, child, MOR_TGT_CHILD);
 505                 locked = true;
 506         }
 507
 508         if (unlikely(lfsck_is_dead_obj(child)))
 509                 GOTO(stop, rc = 0);
 510
 511         rc = dt_attr_get(env, child, la, BYPASS_CAPA);
 512         if (rc == 0)
 513                 rc = lfsck_links_read(env, child, &ldata);
 514         if (rc != 0) {
 515                 if ((bk->lb_param & LPF_DRYRUN) &&
 516                     (rc == -EINVAL || rc == -ENODATA))
 517                         rc = 1;
 518
 519                 GOTO(stop, rc);
 520         }
 521
 522         linkea_first_entry(&ldata);
 523         while (ldata.ld_lee != NULL) {
 524                 struct dt_object *parent = NULL;
 525
 526                 rc = lfsck_linkea_entry_unpack(lfsck, &ldata, cname, pfid);
 527                 if (rc > 0)
 528                         update = true;
 529
 530                 if (!fid_is_sane(pfid))
 531                         goto shrink;
 532
 533                 parent = lfsck_object_find(env, lfsck, pfid);
 534                 if (parent == NULL)
 535                         goto shrink;
 536                 else if (IS_ERR(parent))
 537                         GOTO(stop, rc = PTR_ERR(parent));
 538
 539                 if (!dt_object_exists(parent))
 540                         goto shrink;
 541
 542                 /* XXX: Currently, skip remote object, the consistency for
 543                  *      remote object will be processed in LFSCK phase III. */
 544                 if (dt_object_remote(parent)) {
 545                         lfsck_object_put(env, parent);
 546                         linkea_next_entry(&ldata);
 547                         continue;
 548                 }
 549
 550                 if (unlikely(!dt_try_as_dir(env, parent)))
 551                         goto shrink;
 552
 553                 /* To guarantee the 'name' is terminated with '0'. */
 554                 memcpy(info->lti_key, cname->ln_name, cname->ln_namelen);
 555                 info->lti_key[cname->ln_namelen] = 0;
 556                 cname->ln_name = info->lti_key;
 557                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
 558                                (const struct dt_key *)cname->ln_name,
 559                                BYPASS_CAPA);
 560                 if (rc != 0 && rc != -ENOENT) {
 561                         lfsck_object_put(env, parent);
 562                         GOTO(stop, rc);
 563                 }
 564
 565                 if (rc == 0) {
 566                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
 567                                 lfsck_object_put(env, parent);
 568                                 linkea_next_entry(&ldata);
 569                                 continue;
 570                         }
 571
 572                         goto shrink;
 573                 }
 574
 575                 /* If there is no name entry in the parent dir and the object
 576                  * link count is less than the linkea entries count, then the
 577                  * linkea entry should be removed. */
 578                 if (ldata.ld_leh->leh_reccount > la->la_nlink)
 579                         goto shrink;
 580
 581                 /* XXX: For the case of there is a linkea entry, but without
 582                  *      name entry pointing to the object and its hard links
 583                  *      count is not less than the object name entries count,
 584                  *      then seems we should add the 'missed' name entry back
 585                  *      to namespace, but before LFSCK phase III finished, we
 586                  *      do not know whether the object has some inconsistency
 587                  *      on other MDTs. So now, do NOT add the name entry back
 588                  *      to the namespace, but keep the linkEA entry. LU-2914 */
 589                 lfsck_object_put(env, parent);
 590                 linkea_next_entry(&ldata);
 591                 continue;
 592
 593 shrink:
 594                 if (parent != NULL)
 595                         lfsck_object_put(env, parent);
 596                 if (bk->lb_param & LPF_DRYRUN)
 597                         RETURN(1);
 598
 599                 CDEBUG(D_LFSCK, "Remove linkEA: "DFID"[%.*s], "DFID"\n",
 600                        PFID(lfsck_dto2fid(child)), cname->ln_namelen, cname->ln_name,
 601                        PFID(pfid));
 602                 linkea_del_buf(&ldata, cname);
 603                 update = true;
 604         }
 605
 606         if (update) {
 607                 if (!com->lc_journal) {
 608                         com->lc_journal = 1;
 609                         goto again;
 610                 }
 611
 612                 rc = lfsck_links_write(env, child, &ldata, handle);
 613         }
 614
 615         GOTO(stop, rc);
 616
 617 stop:
 618         if (locked) {
 619         /* XXX: For the case linkea entries count does not match the object hard
 620          *      links count, we cannot update the later one simply. Before LFSCK
 621          *      phase III finished, we cannot know whether there are some remote
 622          *      name entries to be repaired or not. LU-2914 */
 623                 if (rc == 0 && !lfsck_is_dead_obj(child) &&
 624                     ldata.ld_leh != NULL &&
 625                     ldata.ld_leh->leh_reccount != la->la_nlink)
 626                         CWARN("%s: the object "DFID" linkEA entry count %u "
 627                               "may not match its hardlink count %u\n",
 628                               lfsck_lfsck2name(lfsck), PFID(cfid),
 629                               ldata.ld_leh->leh_reccount, la->la_nlink);
 630
 631                 dt_write_unlock(env, child);
 632         }
 633
 634         if (handle != NULL)
 635                 dt_trans_stop(env, lfsck->li_next, handle);
 636
 637         if (rc == 0 && update) {
 638                 ns->ln_objs_nlink_repaired++;
 639                 rc = 1;
 640         }
 641
 642         return rc;
 643 }
 644
 645 /* namespace APIs */
 646
 647 static int lfsck_namespace_reset(const struct lu_env *env,
 648                                  struct lfsck_component *com, bool init)
 649 {
 650         struct lfsck_instance   *lfsck = com->lc_lfsck;
 651         struct lfsck_namespace  *ns    = com->lc_file_ram;
 652         struct dt_object        *root;
 653         struct dt_object        *dto;
 654         int                      rc;
 655         ENTRY;
 656
 657         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
 658         if (IS_ERR(root))
 659                 RETURN(PTR_ERR(root));
 660
 661         if (unlikely(!dt_try_as_dir(env, root))) {
 662                 lu_object_put(env, &root->do_lu);
 663                 RETURN(-ENOTDIR);
 664         }
 665
 666         down_write(&com->lc_sem);
 667         if (init) {
 668                 memset(ns, 0, sizeof(*ns));
 669         } else {
 670                 __u32 count = ns->ln_success_count;
 671                 __u64 last_time = ns->ln_time_last_complete;
 672
 673                 memset(ns, 0, sizeof(*ns));
 674                 ns->ln_success_count = count;
 675                 ns->ln_time_last_complete = last_time;
 676         }
 677         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 678         ns->ln_status = LS_INIT;
 679
 680         rc = local_object_unlink(env, lfsck->li_bottom, root,
 681                                  lfsck_namespace_name);
 682         if (rc != 0)
 683                 GOTO(out, rc);
 684
 685         lfsck_object_put(env, com->lc_obj);
 686         com->lc_obj = NULL;
 687         dto = local_index_find_or_create(env, lfsck->li_los, root,
 688                                          lfsck_namespace_name,
 689                                          S_IFREG | S_IRUGO | S_IWUSR,
 690                                          &dt_lfsck_features);
 691         if (IS_ERR(dto))
 692                 GOTO(out, rc = PTR_ERR(dto));
 693
 694         com->lc_obj = dto;
 695         rc = dto->do_ops->do_index_try(env, dto, &dt_lfsck_features);
 696         if (rc != 0)
 697                 GOTO(out, rc);
 698
 699         rc = lfsck_namespace_store(env, com, true);
 700
 701         GOTO(out, rc);
 702
 703 out:
 704         up_write(&com->lc_sem);
 705         lu_object_put(env, &root->do_lu);
 706         return rc;
 707 }
 708
 709 static void
 710 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
 711                      bool new_checked)
 712 {
 713         struct lfsck_namespace *ns = com->lc_file_ram;
 714
 715         down_write(&com->lc_sem);
 716         if (new_checked)
 717                 com->lc_new_checked++;
 718         ns->ln_items_failed++;
 719         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
 720                 lfsck_pos_fill(env, com->lc_lfsck,
 721                                &ns->ln_pos_first_inconsistent, false);
 722         up_write(&com->lc_sem);
 723 }
 724
 725 static int lfsck_namespace_checkpoint(const struct lu_env *env,
 726                                       struct lfsck_component *com, bool init)
 727 {
 728         struct lfsck_instance   *lfsck = com->lc_lfsck;
 729         struct lfsck_namespace  *ns    = com->lc_file_ram;
 730         int                      rc;
 731
 732         if (com->lc_new_checked == 0 && !init)
 733                 return 0;
 734
 735         down_write(&com->lc_sem);
 736
 737         if (init) {
 738                 ns->ln_pos_latest_start = lfsck->li_pos_current;
 739         } else {
 740                 ns->ln_pos_last_checkpoint = lfsck->li_pos_current;
 741                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
 742                                 HALF_SEC - lfsck->li_time_last_checkpoint);
 743                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
 744                 ns->ln_items_checked += com->lc_new_checked;
 745                 com->lc_new_checked = 0;
 746         }
 747
 748         rc = lfsck_namespace_store(env, com, false);
 749
 750         up_write(&com->lc_sem);
 751         return rc;
 752 }
 753
 754 static int lfsck_namespace_prep(const struct lu_env *env,
 755                                 struct lfsck_component *com)
 756 {
 757         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 758         struct lfsck_namespace  *ns     = com->lc_file_ram;
 759         struct lfsck_position   *pos    = &com->lc_pos_start;
 760
 761         if (ns->ln_status == LS_COMPLETED) {
 762                 int rc;
 763
 764                 rc = lfsck_namespace_reset(env, com, false);
 765                 if (rc != 0)
 766                         return rc;
 767         }
 768
 769         down_write(&com->lc_sem);
 770
 771         ns->ln_time_latest_start = cfs_time_current_sec();
 772
 773         spin_lock(&lfsck->li_lock);
 774         if (ns->ln_flags & LF_SCANNED_ONCE) {
 775                 if (!lfsck->li_drop_dryrun ||
 776                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
 777                         ns->ln_status = LS_SCANNING_PHASE2;
 778                         cfs_list_del_init(&com->lc_link);
 779                         cfs_list_add_tail(&com->lc_link,
 780                                           &lfsck->li_list_double_scan);
 781                         if (!cfs_list_empty(&com->lc_link_dir))
 782                                 cfs_list_del_init(&com->lc_link_dir);
 783                         lfsck_pos_set_zero(pos);
 784                 } else {
 785                         ns->ln_status = LS_SCANNING_PHASE1;
 786                         ns->ln_run_time_phase1 = 0;
 787                         ns->ln_run_time_phase2 = 0;
 788                         ns->ln_items_checked = 0;
 789                         ns->ln_items_repaired = 0;
 790                         ns->ln_items_failed = 0;
 791                         ns->ln_dirs_checked = 0;
 792                         ns->ln_mlinked_checked = 0;
 793                         ns->ln_objs_checked_phase2 = 0;
 794                         ns->ln_objs_repaired_phase2 = 0;
 795                         ns->ln_objs_failed_phase2 = 0;
 796                         ns->ln_objs_nlink_repaired = 0;
 797                         ns->ln_objs_lost_found = 0;
 798                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
 799                         if (cfs_list_empty(&com->lc_link_dir))
 800                                 cfs_list_add_tail(&com->lc_link_dir,
 801                                                   &lfsck->li_list_dir);
 802                         *pos = ns->ln_pos_first_inconsistent;
 803                 }
 804         } else {
 805                 ns->ln_status = LS_SCANNING_PHASE1;
 806                 if (cfs_list_empty(&com->lc_link_dir))
 807                         cfs_list_add_tail(&com->lc_link_dir,
 808                                           &lfsck->li_list_dir);
 809                 if (!lfsck->li_drop_dryrun ||
 810                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
 811                         *pos = ns->ln_pos_last_checkpoint;
 812                         pos->lp_oit_cookie++;
 813                 } else {
 814                         *pos = ns->ln_pos_first_inconsistent;
 815                 }
 816         }
 817         spin_unlock(&lfsck->li_lock);
 818
 819         up_write(&com->lc_sem);
 820         return 0;
 821 }
 822
 823 static int lfsck_namespace_exec_oit(const struct lu_env *env,
 824                                     struct lfsck_component *com,
 825                                     struct dt_object *obj)
 826 {
 827         down_write(&com->lc_sem);
 828         com->lc_new_checked++;
 829         if (S_ISDIR(lfsck_object_type(obj)))
 830                 ((struct lfsck_namespace *)com->lc_file_ram)->ln_dirs_checked++;
 831         up_write(&com->lc_sem);
 832         return 0;
 833 }
 834
 835 static int lfsck_namespace_exec_dir(const struct lu_env *env,
 836                                     struct lfsck_component *com,
 837                                     struct dt_object *obj,
 838                                     struct lu_dirent *ent)
 839 {
 840         struct lfsck_thread_info   *info     = lfsck_env_info(env);
 841         struct lu_attr             *la       = &info->lti_la;
 842         struct lfsck_instance      *lfsck    = com->lc_lfsck;
 843         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
 844         struct lfsck_namespace     *ns       = com->lc_file_ram;
 845         struct linkea_data          ldata    = { 0 };
 846         const struct lu_fid        *pfid     = lfsck_dto2fid(lfsck->li_obj_dir);
 847         const struct lu_fid        *cfid     = lfsck_dto2fid(obj);
 848         const struct lu_name       *cname;
 849         struct thandle             *handle   = NULL;
 850         bool                        repaired = false;
 851         bool                        locked   = false;
 852         bool                        remove;
 853         bool                        newdata;
 854         int                         count    = 0;
 855         int                         rc;
 856         ENTRY;
 857
 858         cname = lfsck_name_get_const(env, ent->lde_name, ent->lde_namelen);
 859         down_write(&com->lc_sem);
 860         com->lc_new_checked++;
 861
 862         if (ent->lde_attrs & LUDA_UPGRADE) {
 863                 ns->ln_flags |= LF_UPGRADE;
 864                 repaired = true;
 865         } else if (ent->lde_attrs & LUDA_REPAIR) {
 866                 ns->ln_flags |= LF_INCONSISTENT;
 867                 repaired = true;
 868         }
 869
 870         if (ent->lde_name[0] == '.' &&
 871             (ent->lde_namelen == 1 ||
 872              (ent->lde_namelen == 2 && ent->lde_name[1] == '.') ||
 873              fid_is_dot_lustre(&ent->lde_fid)))
 874                 GOTO(out, rc = 0);
 875
 876         if (!(bk->lb_param & LPF_DRYRUN) &&
 877             (com->lc_journal || repaired)) {
 878
 879 again:
 880                 LASSERT(!locked);
 881
 882                 com->lc_journal = 1;
 883                 handle = dt_trans_create(env, lfsck->li_next);
 884                 if (IS_ERR(handle))
 885                         GOTO(out, rc = PTR_ERR(handle));
 886
 887                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
 888                 if (rc != 0)
 889                         GOTO(stop, rc);
 890
 891                 rc = dt_trans_start(env, lfsck->li_next, handle);
 892                 if (rc != 0)
 893                         GOTO(stop, rc);
 894
 895                 dt_write_lock(env, obj, MOR_TGT_CHILD);
 896                 locked = true;
 897         }
 898
 899         rc = lfsck_namespace_check_exist(env, lfsck, obj, ent->lde_name);
 900         if (rc != 0)
 901                 GOTO(stop, rc);
 902
 903         rc = lfsck_links_read(env, obj, &ldata);
 904         if (rc == 0) {
 905                 count = ldata.ld_leh->leh_reccount;
 906                 rc = linkea_links_find(&ldata, cname, pfid);
 907                 if ((rc == 0) &&
 908                     (count == 1 || !S_ISDIR(lfsck_object_type(obj))))
 909                         goto record;
 910
 911                 ns->ln_flags |= LF_INCONSISTENT;
 912                 /* For dir, if there are more than one linkea entries, or the
 913                  * linkea entry does not match the name entry, then remove all
 914                  * and add the correct one. */
 915                 if (S_ISDIR(lfsck_object_type(obj))) {
 916                         remove = true;
 917                         newdata = true;
 918                 } else {
 919                         remove = false;
 920                         newdata = false;
 921                 }
 922                 goto nodata;
 923         } else if (unlikely(rc == -EINVAL)) {
 924                 count = 1;
 925                 ns->ln_flags |= LF_INCONSISTENT;
 926                 /* The magic crashed, we are not sure whether there are more
 927                  * corrupt data in the linkea, so remove all linkea entries. */
 928                 remove = true;
 929                 newdata = true;
 930                 goto nodata;
 931         } else if (rc == -ENODATA) {
 932                 count = 1;
 933                 ns->ln_flags |= LF_UPGRADE;
 934                 remove = false;
 935                 newdata = true;
 936
 937 nodata:
 938                 if (bk->lb_param & LPF_DRYRUN) {
 939                         repaired = true;
 940                         goto record;
 941                 }
 942
 943                 if (!com->lc_journal)
 944                         goto again;
 945
 946                 if (remove) {
 947                         LASSERT(newdata);
 948
 949                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle,
 950                                           BYPASS_CAPA);
 951                         if (rc != 0)
 952                                 GOTO(stop, rc);
 953                 }
 954
 955                 if (newdata) {
 956                         rc = linkea_data_new(&ldata,
 957                                         &lfsck_env_info(env)->lti_linkea_buf);
 958                         if (rc != 0)
 959                                 GOTO(stop, rc);
 960                 }
 961
 962                 rc = linkea_add_buf(&ldata, cname, pfid);
 963                 if (rc != 0)
 964                         GOTO(stop, rc);
 965
 966                 rc = lfsck_links_write(env, obj, &ldata, handle);
 967                 if (rc != 0)
 968                         GOTO(stop, rc);
 969
 970                 count = ldata.ld_leh->leh_reccount;
 971                 repaired = true;
 972         } else {
 973                 GOTO(stop, rc);
 974         }
 975
 976 record:
 977         LASSERT(count > 0);
 978
 979         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
 980         if (rc != 0)
 981                 GOTO(stop, rc);
 982
 983         if ((count == 1) &&
 984             (la->la_nlink == 1 || S_ISDIR(lfsck_object_type(obj))))
 985                 /* Usually, it is for single linked object or dir, do nothing.*/
 986                 GOTO(stop, rc);
 987
 988         /* Following modification will be in another transaction.  */
 989         if (handle != NULL) {
 990                 LASSERT(dt_write_locked(env, obj));
 991
 992                 dt_write_unlock(env, obj);
 993                 locked = false;
 994
 995                 dt_trans_stop(env, lfsck->li_next, handle);
 996                 handle = NULL;
 997         }
 998
 999         ns->ln_mlinked_checked++;
1000         rc = lfsck_namespace_update(env, com, cfid,
1001                         count != la->la_nlink ? LLF_UNMATCH_NLINKS : 0, false);
1002
1003         GOTO(out, rc);
1004
1005 stop:
1006         if (locked)
1007                 dt_write_unlock(env, obj);
1008
1009         if (handle != NULL)
1010                 dt_trans_stop(env, lfsck->li_next, handle);
1011
1012 out:
1013         if (rc < 0) {
1014                 ns->ln_items_failed++;
1015                 if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
1016                         lfsck_pos_fill(env, lfsck,
1017                                        &ns->ln_pos_first_inconsistent, false);
1018                 if (!(bk->lb_param & LPF_FAILOUT))
1019                         rc = 0;
1020         } else {
1021                 if (repaired) {
1022                         ns->ln_items_repaired++;
1023                         if (bk->lb_param & LPF_DRYRUN &&
1024                             lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
1025                                 lfsck_pos_fill(env, lfsck,
1026                                                &ns->ln_pos_first_inconsistent,
1027                                                false);
1028                 } else {
1029                         com->lc_journal = 0;
1030                 }
1031                 rc = 0;
1032         }
1033         up_write(&com->lc_sem);
1034         return rc;
1035 }
1036
1037 static int lfsck_namespace_post(const struct lu_env *env,
1038                                 struct lfsck_component *com,
1039                                 int result, bool init)
1040 {
1041         struct lfsck_instance   *lfsck = com->lc_lfsck;
1042         struct lfsck_namespace  *ns    = com->lc_file_ram;
1043         int                      rc;
1044
1045         down_write(&com->lc_sem);
1046
1047         spin_lock(&lfsck->li_lock);
1048         if (!init)
1049                 ns->ln_pos_last_checkpoint = lfsck->li_pos_current;
1050         if (result > 0) {
1051                 ns->ln_status = LS_SCANNING_PHASE2;
1052                 ns->ln_flags |= LF_SCANNED_ONCE;
1053                 ns->ln_flags &= ~LF_UPGRADE;
1054                 cfs_list_del_init(&com->lc_link);
1055                 cfs_list_del_init(&com->lc_link_dir);
1056                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_double_scan);
1057         } else if (result == 0) {
1058                 ns->ln_status = lfsck->li_status;
1059                 if (ns->ln_status == 0)
1060                         ns->ln_status = LS_STOPPED;
1061                 if (ns->ln_status != LS_PAUSED) {
1062                         cfs_list_del_init(&com->lc_link);
1063                         cfs_list_del_init(&com->lc_link_dir);
1064                         cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1065                 }
1066         } else {
1067                 ns->ln_status = LS_FAILED;
1068                 cfs_list_del_init(&com->lc_link);
1069                 cfs_list_del_init(&com->lc_link_dir);
1070                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1071         }
1072         spin_unlock(&lfsck->li_lock);
1073
1074         if (!init) {
1075                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
1076                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1077                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
1078                 ns->ln_items_checked += com->lc_new_checked;
1079                 com->lc_new_checked = 0;
1080         }
1081
1082         rc = lfsck_namespace_store(env, com, false);
1083
1084         up_write(&com->lc_sem);
1085         return rc;
1086 }
1087
1088 static int
1089 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
1090                      char *buf, int len)
1091 {
1092         struct lfsck_instance   *lfsck = com->lc_lfsck;
1093         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
1094         struct lfsck_namespace  *ns    = com->lc_file_ram;
1095         int                      save  = len;
1096         int                      ret   = -ENOSPC;
1097         int                      rc;
1098
1099         down_read(&com->lc_sem);
1100         rc = snprintf(buf, len,
1101                       "name: lfsck_namespace\n"
1102                       "magic: %#x\n"
1103                       "version: %d\n"
1104                       "status: %s\n",
1105                       ns->ln_magic,
1106                       bk->lb_version,
1107                       lfsck_status2names(ns->ln_status));
1108         if (rc <= 0)
1109                 goto out;
1110
1111         buf += rc;
1112         len -= rc;
1113         rc = lfsck_bits_dump(&buf, &len, ns->ln_flags, lfsck_flags_names,
1114                              "flags");
1115         if (rc < 0)
1116                 goto out;
1117
1118         rc = lfsck_bits_dump(&buf, &len, bk->lb_param, lfsck_param_names,
1119                              "param");
1120         if (rc < 0)
1121                 goto out;
1122
1123         rc = lfsck_time_dump(&buf, &len, ns->ln_time_last_complete,
1124                              "time_since_last_completed");
1125         if (rc < 0)
1126                 goto out;
1127
1128         rc = lfsck_time_dump(&buf, &len, ns->ln_time_latest_start,
1129                              "time_since_latest_start");
1130         if (rc < 0)
1131                 goto out;
1132
1133         rc = lfsck_time_dump(&buf, &len, ns->ln_time_last_checkpoint,
1134                              "time_since_last_checkpoint");
1135         if (rc < 0)
1136                 goto out;
1137
1138         rc = lfsck_pos_dump(&buf, &len, &ns->ln_pos_latest_start,
1139                             "latest_start_position");
1140         if (rc < 0)
1141                 goto out;
1142
1143         rc = lfsck_pos_dump(&buf, &len, &ns->ln_pos_last_checkpoint,
1144                             "last_checkpoint_position");
1145         if (rc < 0)
1146                 goto out;
1147
1148         rc = lfsck_pos_dump(&buf, &len, &ns->ln_pos_first_inconsistent,
1149                             "first_failure_position");
1150         if (rc < 0)
1151                 goto out;
1152
1153         if (ns->ln_status == LS_SCANNING_PHASE1) {
1154                 struct lfsck_position pos;
1155                 const struct dt_it_ops *iops;
1156                 cfs_duration_t duration = cfs_time_current() -
1157                                           lfsck->li_time_last_checkpoint;
1158                 __u64 checked = ns->ln_items_checked + com->lc_new_checked;
1159                 __u64 speed = checked;
1160                 __u64 new_checked = com->lc_new_checked * HZ;
1161                 __u32 rtime = ns->ln_run_time_phase1 +
1162                               cfs_duration_sec(duration + HALF_SEC);
1163
1164                 if (duration != 0)
1165                         do_div(new_checked, duration);
1166                 if (rtime != 0)
1167                         do_div(speed, rtime);
1168                 rc = snprintf(buf, len,
1169                               "checked_phase1: "LPU64"\n"
1170                               "checked_phase2: "LPU64"\n"
1171                               "updated_phase1: "LPU64"\n"
1172                               "updated_phase2: "LPU64"\n"
1173                               "failed_phase1: "LPU64"\n"
1174                               "failed_phase2: "LPU64"\n"
1175                               "dirs: "LPU64"\n"
1176                               "M-linked: "LPU64"\n"
1177                               "nlinks_repaired: "LPU64"\n"
1178                               "lost_found: "LPU64"\n"
1179                               "success_count: %u\n"
1180                               "run_time_phase1: %u seconds\n"
1181                               "run_time_phase2: %u seconds\n"
1182                               "average_speed_phase1: "LPU64" items/sec\n"
1183                               "average_speed_phase2: N/A\n"
1184                               "real-time_speed_phase1: "LPU64" items/sec\n"
1185                               "real-time_speed_phase2: N/A\n",
1186                               checked,
1187                               ns->ln_objs_checked_phase2,
1188                               ns->ln_items_repaired,
1189                               ns->ln_objs_repaired_phase2,
1190                               ns->ln_items_failed,
1191                               ns->ln_objs_failed_phase2,
1192                               ns->ln_dirs_checked,
1193                               ns->ln_mlinked_checked,
1194                               ns->ln_objs_nlink_repaired,
1195                               ns->ln_objs_lost_found,
1196                               ns->ln_success_count,
1197                               rtime,
1198                               ns->ln_run_time_phase2,
1199                               speed,
1200                               new_checked);
1201                 if (rc <= 0)
1202                         goto out;
1203
1204                 buf += rc;
1205                 len -= rc;
1206
1207                 LASSERT(lfsck->li_di_oit != NULL);
1208
1209                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
1210
1211                 /* The low layer otable-based iteration position may NOT
1212                  * exactly match the namespace-based directory traversal
1213                  * cookie. Generally, it is not a serious issue. But the
1214                  * caller should NOT make assumption on that. */
1215                 pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
1216                 if (!lfsck->li_current_oit_processed)
1217                         pos.lp_oit_cookie--;
1218
1219                 spin_lock(&lfsck->li_lock);
1220                 if (lfsck->li_di_dir != NULL) {
1221                         pos.lp_dir_cookie = lfsck->li_cookie_dir;
1222                         if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
1223                                 fid_zero(&pos.lp_dir_parent);
1224                                 pos.lp_dir_cookie = 0;
1225                         } else {
1226                                 pos.lp_dir_parent =
1227                                         *lfsck_dto2fid(lfsck->li_obj_dir);
1228                         }
1229                 } else {
1230                         fid_zero(&pos.lp_dir_parent);
1231                         pos.lp_dir_cookie = 0;
1232                 }
1233                 spin_unlock(&lfsck->li_lock);
1234                 rc = lfsck_pos_dump(&buf, &len, &pos, "current_position");
1235                 if (rc <= 0)
1236                         goto out;
1237         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
1238                 cfs_duration_t duration = cfs_time_current() -
1239                                           lfsck->li_time_last_checkpoint;
1240                 __u64 checked = ns->ln_objs_checked_phase2 +
1241                                 com->lc_new_checked;
1242                 __u64 speed1 = ns->ln_items_checked;
1243                 __u64 speed2 = checked;
1244                 __u64 new_checked = com->lc_new_checked * HZ;
1245                 __u32 rtime = ns->ln_run_time_phase2 +
1246                               cfs_duration_sec(duration + HALF_SEC);
1247
1248                 if (duration != 0)
1249                         do_div(new_checked, duration);
1250                 if (ns->ln_run_time_phase1 != 0)
1251                         do_div(speed1, ns->ln_run_time_phase1);
1252                 if (rtime != 0)
1253                         do_div(speed2, rtime);
1254                 rc = snprintf(buf, len,
1255                               "checked_phase1: "LPU64"\n"
1256                               "checked_phase2: "LPU64"\n"
1257                               "updated_phase1: "LPU64"\n"
1258                               "updated_phase2: "LPU64"\n"
1259                               "failed_phase1: "LPU64"\n"
1260                               "failed_phase2: "LPU64"\n"
1261                               "dirs: "LPU64"\n"
1262                               "M-linked: "LPU64"\n"
1263                               "nlinks_repaired: "LPU64"\n"
1264                               "lost_found: "LPU64"\n"
1265                               "success_count: %u\n"
1266                               "run_time_phase1: %u seconds\n"
1267                               "run_time_phase2: %u seconds\n"
1268                               "average_speed_phase1: "LPU64" items/sec\n"
1269                               "average_speed_phase2: "LPU64" objs/sec\n"
1270                               "real-time_speed_phase1: N/A\n"
1271                               "real-time_speed_phase2: "LPU64" objs/sec\n"
1272                               "current_position: "DFID"\n",
1273                               ns->ln_items_checked,
1274                               checked,
1275                               ns->ln_items_repaired,
1276                               ns->ln_objs_repaired_phase2,
1277                               ns->ln_items_failed,
1278                               ns->ln_objs_failed_phase2,
1279                               ns->ln_dirs_checked,
1280                               ns->ln_mlinked_checked,
1281                               ns->ln_objs_nlink_repaired,
1282                               ns->ln_objs_lost_found,
1283                               ns->ln_success_count,
1284                               ns->ln_run_time_phase1,
1285                               rtime,
1286                               speed1,
1287                               speed2,
1288                               new_checked,
1289                               PFID(&ns->ln_fid_latest_scanned_phase2));
1290                 if (rc <= 0)
1291                         goto out;
1292
1293                 buf += rc;
1294                 len -= rc;
1295         } else {
1296                 __u64 speed1 = ns->ln_items_checked;
1297                 __u64 speed2 = ns->ln_objs_checked_phase2;
1298
1299                 if (ns->ln_run_time_phase1 != 0)
1300                         do_div(speed1, ns->ln_run_time_phase1);
1301                 if (ns->ln_run_time_phase2 != 0)
1302                         do_div(speed2, ns->ln_run_time_phase2);
1303                 rc = snprintf(buf, len,
1304                               "checked_phase1: "LPU64"\n"
1305                               "checked_phase2: "LPU64"\n"
1306                               "updated_phase1: "LPU64"\n"
1307                               "updated_phase2: "LPU64"\n"
1308                               "failed_phase1: "LPU64"\n"
1309                               "failed_phase2: "LPU64"\n"
1310                               "dirs: "LPU64"\n"
1311                               "M-linked: "LPU64"\n"
1312                               "nlinks_repaired: "LPU64"\n"
1313                               "lost_found: "LPU64"\n"
1314                               "success_count: %u\n"
1315                               "run_time_phase1: %u seconds\n"
1316                               "run_time_phase2: %u seconds\n"
1317                               "average_speed_phase1: "LPU64" items/sec\n"
1318                               "average_speed_phase2: "LPU64" objs/sec\n"
1319                               "real-time_speed_phase1: N/A\n"
1320                               "real-time_speed_phase2: N/A\n"
1321                               "current_position: N/A\n",
1322                               ns->ln_items_checked,
1323                               ns->ln_objs_checked_phase2,
1324                               ns->ln_items_repaired,
1325                               ns->ln_objs_repaired_phase2,
1326                               ns->ln_items_failed,
1327                               ns->ln_objs_failed_phase2,
1328                               ns->ln_dirs_checked,
1329                               ns->ln_mlinked_checked,
1330                               ns->ln_objs_nlink_repaired,
1331                               ns->ln_objs_lost_found,
1332                               ns->ln_success_count,
1333                               ns->ln_run_time_phase1,
1334                               ns->ln_run_time_phase2,
1335                               speed1,
1336                               speed2);
1337                 if (rc <= 0)
1338                         goto out;
1339
1340                 buf += rc;
1341                 len -= rc;
1342         }
1343         ret = save - len;
1344
1345 out:
1346         up_read(&com->lc_sem);
1347         return ret;
1348 }
1349
1350 static int lfsck_namespace_double_scan_main(void *args)
1351 {
1352         struct lfsck_thread_args *lta   = args;
1353         const struct lu_env     *env    = &lta->lta_env;
1354         struct lfsck_component  *com    = lta->lta_com;
1355         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1356         struct ptlrpc_thread    *thread = &lfsck->li_thread;
1357         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
1358         struct lfsck_namespace  *ns     = com->lc_file_ram;
1359         struct dt_object        *obj    = com->lc_obj;
1360         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
1361         struct dt_object        *target;
1362         struct dt_it            *di;
1363         struct dt_key           *key;
1364         struct lu_fid            fid;
1365         int                      rc;
1366         __u8                     flags = 0;
1367         ENTRY;
1368
1369         com->lc_new_checked = 0;
1370         com->lc_new_scanned = 0;
1371         com->lc_time_last_checkpoint = cfs_time_current();
1372         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
1373                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1374
1375         di = iops->init(env, obj, 0, BYPASS_CAPA);
1376         if (IS_ERR(di))
1377                 GOTO(out, rc = PTR_ERR(di));
1378
1379         fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
1380         rc = iops->get(env, di, (const struct dt_key *)&fid);
1381         if (rc < 0)
1382                 GOTO(fini, rc);
1383
1384         /* Skip the start one, which either has been processed or non-exist. */
1385         rc = iops->next(env, di);
1386         if (rc != 0)
1387                 GOTO(put, rc);
1388
1389         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1390                 GOTO(put, rc = 0);
1391
1392         do {
1393                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY3) &&
1394                     cfs_fail_val > 0) {
1395                         struct l_wait_info lwi;
1396
1397                         lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val),
1398                                           NULL, NULL);
1399                         l_wait_event(thread->t_ctl_waitq,
1400                                      !thread_is_running(thread),
1401                                      &lwi);
1402                 }
1403
1404                 key = iops->key(env, di);
1405                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
1406                 target = lfsck_object_find(env, lfsck, &fid);
1407                 down_write(&com->lc_sem);
1408                 if (target == NULL) {
1409                         rc = 0;
1410                         goto checkpoint;
1411                 } else if (IS_ERR(target)) {
1412                         rc = PTR_ERR(target);
1413                         goto checkpoint;
1414                 }
1415
1416                 /* XXX: Currently, skip remote object, the consistency for
1417                  *      remote object will be processed in LFSCK phase III. */
1418                 if (dt_object_exists(target) && !dt_object_remote(target)) {
1419                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
1420                         if (rc == 0)
1421                                 rc = lfsck_namespace_double_scan_one(env, com,
1422                                                                 target, flags);
1423                 }
1424
1425                 lfsck_object_put(env, target);
1426
1427 checkpoint:
1428                 com->lc_new_checked++;
1429                 com->lc_new_scanned++;
1430                 ns->ln_fid_latest_scanned_phase2 = fid;
1431                 if (rc > 0)
1432                         ns->ln_objs_repaired_phase2++;
1433                 else if (rc < 0)
1434                         ns->ln_objs_failed_phase2++;
1435                 up_write(&com->lc_sem);
1436
1437                 if ((rc == 0) || ((rc > 0) && !(bk->lb_param & LPF_DRYRUN))) {
1438                         lfsck_namespace_delete(env, com, &fid);
1439                 } else if (rc < 0) {
1440                         flags |= LLF_REPAIR_FAILED;
1441                         lfsck_namespace_update(env, com, &fid, flags, true);
1442                 }
1443
1444                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1445                         GOTO(put, rc);
1446
1447                 if (unlikely(cfs_time_beforeq(com->lc_time_next_checkpoint,
1448                                               cfs_time_current())) &&
1449                     com->lc_new_checked != 0) {
1450                         down_write(&com->lc_sem);
1451                         ns->ln_run_time_phase2 +=
1452                                 cfs_duration_sec(cfs_time_current() +
1453                                 HALF_SEC - com->lc_time_last_checkpoint);
1454                         ns->ln_time_last_checkpoint = cfs_time_current_sec();
1455                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
1456                         com->lc_new_checked = 0;
1457                         rc = lfsck_namespace_store(env, com, false);
1458                         up_write(&com->lc_sem);
1459                         if (rc != 0)
1460                                 GOTO(put, rc);
1461
1462                         com->lc_time_last_checkpoint = cfs_time_current();
1463                         com->lc_time_next_checkpoint =
1464                                 com->lc_time_last_checkpoint +
1465                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1466                 }
1467
1468                 lfsck_control_speed_by_self(com);
1469                 if (unlikely(!thread_is_running(thread)))
1470                         GOTO(put, rc = 0);
1471
1472                 rc = iops->next(env, di);
1473         } while (rc == 0);
1474
1475         GOTO(put, rc);
1476
1477 put:
1478         iops->put(env, di);
1479
1480 fini:
1481         iops->fini(env, di);
1482
1483 out:
1484         down_write(&com->lc_sem);
1485
1486         ns->ln_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
1487                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1488         ns->ln_time_last_checkpoint = cfs_time_current_sec();
1489         ns->ln_objs_checked_phase2 += com->lc_new_checked;
1490         com->lc_new_checked = 0;
1491
1492         if (rc > 0) {
1493                 com->lc_journal = 0;
1494                 ns->ln_status = LS_COMPLETED;
1495                 if (!(bk->lb_param & LPF_DRYRUN))
1496                         ns->ln_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
1497                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
1498                 ns->ln_success_count++;
1499         } else if (rc == 0) {
1500                 ns->ln_status = lfsck->li_status;
1501                 if (ns->ln_status == 0)
1502                         ns->ln_status = LS_STOPPED;
1503         } else {
1504                 ns->ln_status = LS_FAILED;
1505         }
1506
1507         if (ns->ln_status != LS_PAUSED) {
1508                 spin_lock(&lfsck->li_lock);
1509                 cfs_list_del_init(&com->lc_link);
1510                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1511                 spin_unlock(&lfsck->li_lock);
1512         }
1513
1514         rc = lfsck_namespace_store(env, com, false);
1515
1516         up_write(&com->lc_sem);
1517         if (atomic_dec_and_test(&lfsck->li_double_scan_count))
1518                 wake_up_all(&thread->t_ctl_waitq);
1519
1520         lfsck_thread_args_fini(lta);
1521
1522         return rc;
1523 }
1524
1525 static int lfsck_namespace_double_scan(const struct lu_env *env,
1526                                        struct lfsck_component *com)
1527 {
1528         struct lfsck_instance           *lfsck = com->lc_lfsck;
1529         struct lfsck_namespace          *ns    = com->lc_file_ram;
1530         struct lfsck_thread_args        *lta;
1531         long                             rc;
1532         ENTRY;
1533
1534         if (unlikely(ns->ln_status != LS_SCANNING_PHASE2))
1535                 RETURN(0);
1536
1537         lta = lfsck_thread_args_init(lfsck, com);
1538         if (IS_ERR(lta))
1539                 RETURN(PTR_ERR(lta));
1540
1541         atomic_inc(&lfsck->li_double_scan_count);
1542         rc = PTR_ERR(kthread_run(lfsck_namespace_double_scan_main, lta,
1543                                  "lfsck_namespace"));
1544         if (IS_ERR_VALUE(rc)) {
1545                 CERROR("%s: cannot start LFSCK namespace thread: rc = %ld\n",
1546                        lfsck_lfsck2name(lfsck), rc);
1547                 atomic_dec(&lfsck->li_double_scan_count);
1548                 lfsck_thread_args_fini(lta);
1549         } else {
1550                 rc = 0;
1551         }
1552
1553         RETURN(rc);
1554 }
1555
1556 static int lfsck_namespace_in_notify(const struct lu_env *env,
1557                                      struct lfsck_component *com,
1558                                      struct lfsck_request *lr)
1559 {
1560         return 0;
1561 }
1562
1563 static int lfsck_namespace_query(const struct lu_env *env,
1564                                  struct lfsck_component *com)
1565 {
1566         struct lfsck_namespace *ns = com->lc_file_ram;
1567
1568         return ns->ln_status;
1569 }
1570
1571 static struct lfsck_operations lfsck_namespace_ops = {
1572         .lfsck_reset            = lfsck_namespace_reset,
1573         .lfsck_fail             = lfsck_namespace_fail,
1574         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
1575         .lfsck_prep             = lfsck_namespace_prep,
1576         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
1577         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
1578         .lfsck_post             = lfsck_namespace_post,
1579         .lfsck_dump             = lfsck_namespace_dump,
1580         .lfsck_double_scan      = lfsck_namespace_double_scan,
1581         .lfsck_in_notify        = lfsck_namespace_in_notify,
1582         .lfsck_query            = lfsck_namespace_query,
1583 };
1584
1585 int lfsck_namespace_setup(const struct lu_env *env,
1586                           struct lfsck_instance *lfsck)
1587 {
1588         struct lfsck_component  *com;
1589         struct lfsck_namespace  *ns;
1590         struct dt_object        *root = NULL;
1591         struct dt_object        *obj;
1592         int                      rc;
1593         ENTRY;
1594
1595         LASSERT(lfsck->li_master);
1596
1597         OBD_ALLOC_PTR(com);
1598         if (com == NULL)
1599                 RETURN(-ENOMEM);
1600
1601         CFS_INIT_LIST_HEAD(&com->lc_link);
1602         CFS_INIT_LIST_HEAD(&com->lc_link_dir);
1603         init_rwsem(&com->lc_sem);
1604         atomic_set(&com->lc_ref, 1);
1605         com->lc_lfsck = lfsck;
1606         com->lc_type = LT_NAMESPACE;
1607         com->lc_ops = &lfsck_namespace_ops;
1608         com->lc_file_size = sizeof(struct lfsck_namespace);
1609         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
1610         if (com->lc_file_ram == NULL)
1611                 GOTO(out, rc = -ENOMEM);
1612
1613         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
1614         if (com->lc_file_disk == NULL)
1615                 GOTO(out, rc = -ENOMEM);
1616
1617         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
1618         if (IS_ERR(root))
1619                 GOTO(out, rc = PTR_ERR(root));
1620
1621         if (unlikely(!dt_try_as_dir(env, root)))
1622                 GOTO(out, rc = -ENOTDIR);
1623
1624         obj = local_index_find_or_create(env, lfsck->li_los, root,
1625                                          lfsck_namespace_name,
1626                                          S_IFREG | S_IRUGO | S_IWUSR,
1627                                          &dt_lfsck_features);
1628         if (IS_ERR(obj))
1629                 GOTO(out, rc = PTR_ERR(obj));
1630
1631         com->lc_obj = obj;
1632         rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_features);
1633         if (rc != 0)
1634                 GOTO(out, rc);
1635
1636         rc = lfsck_namespace_load(env, com);
1637         if (rc > 0)
1638                 rc = lfsck_namespace_reset(env, com, true);
1639         else if (rc == -ENODATA)
1640                 rc = lfsck_namespace_init(env, com);
1641         if (rc != 0)
1642                 GOTO(out, rc);
1643
1644         ns = com->lc_file_ram;
1645         switch (ns->ln_status) {
1646         case LS_INIT:
1647         case LS_COMPLETED:
1648         case LS_FAILED:
1649         case LS_STOPPED:
1650                 spin_lock(&lfsck->li_lock);
1651                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1652                 spin_unlock(&lfsck->li_lock);
1653                 break;
1654         default:
1655                 CERROR("%s: unknown lfsck_namespace status: rc = %u\n",
1656                        lfsck_lfsck2name(lfsck), ns->ln_status);
1657                 /* fall through */
1658         case LS_SCANNING_PHASE1:
1659         case LS_SCANNING_PHASE2:
1660                 /* No need to store the status to disk right now.
1661                  * If the system crashed before the status stored,
1662                  * it will be loaded back when next time. */
1663                 ns->ln_status = LS_CRASHED;
1664                 /* fall through */
1665         case LS_PAUSED:
1666         case LS_CRASHED:
1667                 spin_lock(&lfsck->li_lock);
1668                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_scan);
1669                 cfs_list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
1670                 spin_unlock(&lfsck->li_lock);
1671                 break;
1672         }
1673
1674         GOTO(out, rc = 0);
1675
1676 out:
1677         if (root != NULL && !IS_ERR(root))
1678                 lu_object_put(env, &root->do_lu);
1679         if (rc != 0)
1680                 lfsck_component_cleanup(env, com);
1681         return rc;
1682 }