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("%.16s: invalid lfsck_namespace magic "
 138                               "0x%x != 0x%x\n",
 139                               lfsck_lfsck2name(com->lc_lfsck),
 140                               ns->ln_magic, LFSCK_NAMESPACE_MAGIC);
 141                         rc = 1;
 142                 } else {
 143                         rc = 0;
 144                 }
 145         } else if (rc != -ENODATA) {
 146                 CERROR("%.16s: fail to load lfsck_namespace, expected = %d, "
 147                        "rc = %d\n", lfsck_lfsck2name(com->lc_lfsck), len, rc);
 148                 if (rc >= 0)
 149                         rc = 1;
 150         }
 151         return rc;
 152 }
 153
 154 static int lfsck_namespace_store(const struct lu_env *env,
 155                                  struct lfsck_component *com, bool init)
 156 {
 157         struct dt_object        *obj    = com->lc_obj;
 158         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 159         struct thandle          *handle;
 160         int                      len    = com->lc_file_size;
 161         int                      rc;
 162         ENTRY;
 163
 164         lfsck_namespace_cpu_to_le((struct lfsck_namespace *)com->lc_file_disk,
 165                                   (struct lfsck_namespace *)com->lc_file_ram);
 166         handle = dt_trans_create(env, lfsck->li_bottom);
 167         if (IS_ERR(handle)) {
 168                 rc = PTR_ERR(handle);
 169                 CERROR("%.16s: fail to create trans for storing "
 170                        "lfsck_namespace: %d\n,", lfsck_lfsck2name(lfsck), rc);
 171                 RETURN(rc);
 172         }
 173
 174         rc = dt_declare_xattr_set(env, obj,
 175                                   lfsck_buf_get(env, com->lc_file_disk, len),
 176                                   XATTR_NAME_LFSCK_NAMESPACE, 0, handle);
 177         if (rc != 0) {
 178                 CERROR("%.16s: fail to declare trans for storing "
 179                        "lfsck_namespace: %d\n,", lfsck_lfsck2name(lfsck), rc);
 180                 GOTO(out, rc);
 181         }
 182
 183         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 184         if (rc != 0) {
 185                 CERROR("%.16s: fail to start trans for storing "
 186                        "lfsck_namespace: %d\n,", lfsck_lfsck2name(lfsck), rc);
 187                 GOTO(out, rc);
 188         }
 189
 190         rc = dt_xattr_set(env, obj,
 191                           lfsck_buf_get(env, com->lc_file_disk, len),
 192                           XATTR_NAME_LFSCK_NAMESPACE,
 193                           init ? LU_XATTR_CREATE : LU_XATTR_REPLACE,
 194                           handle, BYPASS_CAPA);
 195         if (rc != 0)
 196                 CERROR("%.16s: fail to store lfsck_namespace, len = %d, "
 197                        "rc = %d\n", lfsck_lfsck2name(lfsck), len, rc);
 198
 199         GOTO(out, rc);
 200
 201 out:
 202         dt_trans_stop(env, lfsck->li_bottom, handle);
 203         return rc;
 204 }
 205
 206 static int lfsck_namespace_init(const struct lu_env *env,
 207                                 struct lfsck_component *com)
 208 {
 209         struct lfsck_namespace *ns = (struct lfsck_namespace *)com->lc_file_ram;
 210         int rc;
 211
 212         memset(ns, 0, sizeof(*ns));
 213         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 214         ns->ln_status = LS_INIT;
 215         down_write(&com->lc_sem);
 216         rc = lfsck_namespace_store(env, com, true);
 217         up_write(&com->lc_sem);
 218         return rc;
 219 }
 220
 221 static int lfsck_namespace_lookup(const struct lu_env *env,
 222                                   struct lfsck_component *com,
 223                                   const struct lu_fid *fid, __u8 *flags)
 224 {
 225         struct lu_fid *key = &lfsck_env_info(env)->lti_fid;
 226         int            rc;
 227
 228         fid_cpu_to_be(key, fid);
 229         rc = dt_lookup(env, com->lc_obj, (struct dt_rec *)flags,
 230                        (const struct dt_key *)key, BYPASS_CAPA);
 231         return rc;
 232 }
 233
 234 static int lfsck_namespace_delete(const struct lu_env *env,
 235                                   struct lfsck_component *com,
 236                                   const struct lu_fid *fid)
 237 {
 238         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 239         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid;
 240         struct thandle          *handle;
 241         struct dt_object        *obj    = com->lc_obj;
 242         int                      rc;
 243         ENTRY;
 244
 245         handle = dt_trans_create(env, lfsck->li_bottom);
 246         if (IS_ERR(handle))
 247                 RETURN(PTR_ERR(handle));
 248
 249         rc = dt_declare_delete(env, obj, (const struct dt_key *)fid, handle);
 250         if (rc != 0)
 251                 GOTO(out, rc);
 252
 253         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 254         if (rc != 0)
 255                 GOTO(out, rc);
 256
 257         fid_cpu_to_be(key, fid);
 258         rc = dt_delete(env, obj, (const struct dt_key *)key, handle,
 259                        BYPASS_CAPA);
 260
 261         GOTO(out, rc);
 262
 263 out:
 264         dt_trans_stop(env, lfsck->li_bottom, handle);
 265         return rc;
 266 }
 267
 268 static int lfsck_namespace_update(const struct lu_env *env,
 269                                   struct lfsck_component *com,
 270                                   const struct lu_fid *fid,
 271                                   __u8 flags, bool force)
 272 {
 273         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 274         struct lu_fid           *key    = &lfsck_env_info(env)->lti_fid;
 275         struct thandle          *handle;
 276         struct dt_object        *obj    = com->lc_obj;
 277         int                      rc;
 278         bool                     exist  = false;
 279         __u8                     tf;
 280         ENTRY;
 281
 282         rc = lfsck_namespace_lookup(env, com, fid, &tf);
 283         if (rc != 0 && rc != -ENOENT)
 284                 RETURN(rc);
 285
 286         if (rc == 0) {
 287                 if (!force || flags == tf)
 288                         RETURN(0);
 289
 290                 exist = true;
 291                 handle = dt_trans_create(env, lfsck->li_bottom);
 292                 if (IS_ERR(handle))
 293                         RETURN(PTR_ERR(handle));
 294
 295                 rc = dt_declare_delete(env, obj, (const struct dt_key *)fid,
 296                                        handle);
 297                 if (rc != 0)
 298                         GOTO(out, rc);
 299         } else {
 300                 handle = dt_trans_create(env, lfsck->li_bottom);
 301                 if (IS_ERR(handle))
 302                         RETURN(PTR_ERR(handle));
 303         }
 304
 305         rc = dt_declare_insert(env, obj, (const struct dt_rec *)&flags,
 306                                (const struct dt_key *)fid, handle);
 307         if (rc != 0)
 308                 GOTO(out, rc);
 309
 310         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 311         if (rc != 0)
 312                 GOTO(out, rc);
 313
 314         fid_cpu_to_be(key, fid);
 315         if (exist) {
 316                 rc = dt_delete(env, obj, (const struct dt_key *)key, handle,
 317                                BYPASS_CAPA);
 318                 if (rc != 0) {
 319                         CERROR("%s: fail to insert "DFID", rc = %d\n",
 320                                lfsck_lfsck2name(com->lc_lfsck), PFID(fid), rc);
 321                         GOTO(out, rc);
 322                 }
 323         }
 324
 325         rc = dt_insert(env, obj, (const struct dt_rec *)&flags,
 326                        (const struct dt_key *)key, handle, BYPASS_CAPA, 1);
 327
 328         GOTO(out, rc);
 329
 330 out:
 331         dt_trans_stop(env, lfsck->li_bottom, handle);
 332         return rc;
 333 }
 334
 335 static int lfsck_namespace_check_exist(const struct lu_env *env,
 336                                        struct lfsck_instance *lfsck,
 337                                        struct dt_object *obj, const char *name)
 338 {
 339         struct dt_object *dir = lfsck->li_obj_dir;
 340         struct lu_fid    *fid = &lfsck_env_info(env)->lti_fid;
 341         int               rc;
 342         ENTRY;
 343
 344         if (unlikely(lfsck_is_dead_obj(obj)))
 345                 RETURN(LFSCK_NAMEENTRY_DEAD);
 346
 347         rc = dt_lookup(env, dir, (struct dt_rec *)fid,
 348                        (const struct dt_key *)name, BYPASS_CAPA);
 349         if (rc == -ENOENT)
 350                 RETURN(LFSCK_NAMEENTRY_REMOVED);
 351
 352         if (rc < 0)
 353                 RETURN(rc);
 354
 355         if (!lu_fid_eq(fid, lfsck_dto2fid(obj)))
 356                 RETURN(LFSCK_NAMEENTRY_RECREATED);
 357
 358         RETURN(0);
 359 }
 360
 361 static int lfsck_declare_namespace_exec_dir(const struct lu_env *env,
 362                                             struct dt_object *obj,
 363                                             struct thandle *handle)
 364 {
 365         int rc;
 366
 367         /* For destroying all invalid linkEA entries. */
 368         rc = dt_declare_xattr_del(env, obj, XATTR_NAME_LINK, handle);
 369         if (rc != 0)
 370                 return rc;
 371
 372         /* For insert new linkEA entry. */
 373         rc = dt_declare_xattr_set(env, obj,
 374                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 375                         XATTR_NAME_LINK, 0, handle);
 376         return rc;
 377 }
 378
 379 static int lfsck_links_read(const struct lu_env *env, struct dt_object *obj,
 380                             struct linkea_data *ldata)
 381 {
 382         int rc;
 383
 384         ldata->ld_buf =
 385                 lu_buf_check_and_alloc(&lfsck_env_info(env)->lti_linkea_buf,
 386                                        PAGE_CACHE_SIZE);
 387         if (ldata->ld_buf->lb_buf == NULL)
 388                 return -ENOMEM;
 389
 390         if (!dt_object_exists(obj))
 391                 return -ENODATA;
 392
 393         rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK, BYPASS_CAPA);
 394         if (rc == -ERANGE) {
 395                 /* Buf was too small, figure out what we need. */
 396                 lu_buf_free(ldata->ld_buf);
 397                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
 398                                   BYPASS_CAPA);
 399                 if (rc < 0)
 400                         return rc;
 401
 402                 ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
 403                 if (ldata->ld_buf->lb_buf == NULL)
 404                         return -ENOMEM;
 405
 406                 rc = dt_xattr_get(env, obj, ldata->ld_buf, XATTR_NAME_LINK,
 407                                   BYPASS_CAPA);
 408         }
 409         if (rc < 0)
 410                 return rc;
 411
 412         linkea_init(ldata);
 413
 414         return 0;
 415 }
 416
 417 static int lfsck_links_write(const struct lu_env *env, struct dt_object *obj,
 418                              struct linkea_data *ldata, struct thandle *handle)
 419 {
 420         const struct lu_buf *buf = lfsck_buf_get_const(env,
 421                                                        ldata->ld_buf->lb_buf,
 422                                                        ldata->ld_leh->leh_len);
 423
 424         return dt_xattr_set(env, obj, buf, XATTR_NAME_LINK, 0, handle,
 425                             BYPASS_CAPA);
 426 }
 427
 428 /**
 429  * \retval ve: removed entries
 430  */
 431 static int lfsck_linkea_entry_unpack(struct lfsck_instance *lfsck,
 432                                      struct linkea_data *ldata,
 433                                      struct lu_name *cname,
 434                                      struct lu_fid *pfid)
 435 {
 436         struct link_ea_entry    *oldlee;
 437         int                      oldlen;
 438         int                      removed = 0;
 439
 440         linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, cname, pfid);
 441         oldlee = ldata->ld_lee;
 442         oldlen = ldata->ld_reclen;
 443         linkea_next_entry(ldata);
 444         while (ldata->ld_lee != NULL) {
 445                 ldata->ld_reclen = (ldata->ld_lee->lee_reclen[0] << 8) |
 446                                    ldata->ld_lee->lee_reclen[1];
 447                 if (unlikely(ldata->ld_reclen == oldlen &&
 448                              memcmp(ldata->ld_lee, oldlee, oldlen) == 0)) {
 449                         linkea_del_buf(ldata, cname);
 450                         removed++;
 451                 } else {
 452                         linkea_next_entry(ldata);
 453                 }
 454         }
 455         ldata->ld_lee = oldlee;
 456         ldata->ld_reclen = oldlen;
 457         return removed;
 458 }
 459
 460 /**
 461  * \retval +ve  repaired
 462  * \retval 0    no need to repair
 463  * \retval -ve  error cases
 464  */
 465 static int lfsck_namespace_double_scan_one(const struct lu_env *env,
 466                                            struct lfsck_component *com,
 467                                            struct dt_object *child, __u8 flags)
 468 {
 469         struct lfsck_thread_info *info    = lfsck_env_info(env);
 470         struct lu_attr           *la      = &info->lti_la;
 471         struct lu_name           *cname   = &info->lti_name;
 472         struct lu_fid            *pfid    = &info->lti_fid;
 473         struct lu_fid            *cfid    = &info->lti_fid2;
 474         struct lfsck_instance   *lfsck    = com->lc_lfsck;
 475         struct lfsck_bookmark   *bk       = &lfsck->li_bookmark_ram;
 476         struct lfsck_namespace  *ns       =
 477                                 (struct lfsck_namespace *)com->lc_file_ram;
 478         struct linkea_data       ldata    = { 0 };
 479         struct thandle          *handle   = NULL;
 480         bool                     locked   = false;
 481         bool                     update   = false;
 482         int                      rc;
 483         ENTRY;
 484
 485         if (com->lc_journal) {
 486
 487 again:
 488                 LASSERT(!locked);
 489
 490                 update = false;
 491                 com->lc_journal = 1;
 492                 handle = dt_trans_create(env, lfsck->li_next);
 493                 if (IS_ERR(handle))
 494                         RETURN(rc = PTR_ERR(handle));
 495
 496                 rc = dt_declare_xattr_set(env, child,
 497                         lfsck_buf_get_const(env, NULL, DEFAULT_LINKEA_SIZE),
 498                         XATTR_NAME_LINK, 0, handle);
 499                 if (rc != 0)
 500                         GOTO(stop, rc);
 501
 502                 rc = dt_trans_start(env, lfsck->li_next, handle);
 503                 if (rc != 0)
 504                         GOTO(stop, rc);
 505
 506                 dt_write_lock(env, child, MOR_TGT_CHILD);
 507                 locked = true;
 508         }
 509
 510         if (unlikely(lfsck_is_dead_obj(child)))
 511                 GOTO(stop, rc = 0);
 512
 513         rc = dt_attr_get(env, child, la, BYPASS_CAPA);
 514         if (rc == 0)
 515                 rc = lfsck_links_read(env, child, &ldata);
 516         if (rc != 0) {
 517                 if ((bk->lb_param & LPF_DRYRUN) &&
 518                     (rc == -EINVAL || rc == -ENODATA))
 519                         rc = 1;
 520
 521                 GOTO(stop, rc);
 522         }
 523
 524         linkea_first_entry(&ldata);
 525         while (ldata.ld_lee != NULL) {
 526                 struct dt_object *parent = NULL;
 527
 528                 rc = lfsck_linkea_entry_unpack(lfsck, &ldata, cname, pfid);
 529                 if (rc > 0)
 530                         update = true;
 531
 532                 if (!fid_is_sane(pfid))
 533                         goto shrink;
 534
 535                 parent = lfsck_object_find(env, lfsck, pfid);
 536                 if (parent == NULL)
 537                         goto shrink;
 538                 else if (IS_ERR(parent))
 539                         GOTO(stop, rc = PTR_ERR(parent));
 540
 541                 if (!dt_object_exists(parent))
 542                         goto shrink;
 543
 544                 /* XXX: Currently, skip remote object, the consistency for
 545                  *      remote object will be processed in LFSCK phase III. */
 546                 if (dt_object_remote(parent)) {
 547                         lfsck_object_put(env, parent);
 548                         linkea_next_entry(&ldata);
 549                         continue;
 550                 }
 551
 552                 if (unlikely(!dt_try_as_dir(env, parent)))
 553                         goto shrink;
 554
 555                 /* To guarantee the 'name' is terminated with '0'. */
 556                 memcpy(info->lti_key, cname->ln_name, cname->ln_namelen);
 557                 info->lti_key[cname->ln_namelen] = 0;
 558                 cname->ln_name = info->lti_key;
 559                 rc = dt_lookup(env, parent, (struct dt_rec *)cfid,
 560                                (const struct dt_key *)cname->ln_name,
 561                                BYPASS_CAPA);
 562                 if (rc != 0 && rc != -ENOENT) {
 563                         lfsck_object_put(env, parent);
 564                         GOTO(stop, rc);
 565                 }
 566
 567                 if (rc == 0) {
 568                         if (lu_fid_eq(cfid, lfsck_dto2fid(child))) {
 569                                 lfsck_object_put(env, parent);
 570                                 linkea_next_entry(&ldata);
 571                                 continue;
 572                         }
 573
 574                         goto shrink;
 575                 }
 576
 577                 /* If there is no name entry in the parent dir and the object
 578                  * link count is less than the linkea entries count, then the
 579                  * linkea entry should be removed. */
 580                 if (ldata.ld_leh->leh_reccount > la->la_nlink)
 581                         goto shrink;
 582
 583                 /* XXX: For the case of there is a linkea entry, but without
 584                  *      name entry pointing to the object and its hard links
 585                  *      count is not less than the object name entries count,
 586                  *      then seems we should add the 'missed' name entry back
 587                  *      to namespace, but before LFSCK phase III finished, we
 588                  *      do not know whether the object has some inconsistency
 589                  *      on other MDTs. So now, do NOT add the name entry back
 590                  *      to the namespace, but keep the linkEA entry. LU-2914 */
 591                 lfsck_object_put(env, parent);
 592                 linkea_next_entry(&ldata);
 593                 continue;
 594
 595 shrink:
 596                 if (parent != NULL)
 597                         lfsck_object_put(env, parent);
 598                 if (bk->lb_param & LPF_DRYRUN)
 599                         RETURN(1);
 600
 601                 CDEBUG(D_LFSCK, "Remove linkEA: "DFID"[%.*s], "DFID"\n",
 602                        PFID(lfsck_dto2fid(child)), cname->ln_namelen, cname->ln_name,
 603                        PFID(pfid));
 604                 linkea_del_buf(&ldata, cname);
 605                 update = true;
 606         }
 607
 608         if (update) {
 609                 if (!com->lc_journal) {
 610                         com->lc_journal = 1;
 611                         goto again;
 612                 }
 613
 614                 rc = lfsck_links_write(env, child, &ldata, handle);
 615         }
 616
 617         GOTO(stop, rc);
 618
 619 stop:
 620         if (locked) {
 621         /* XXX: For the case linkea entries count does not match the object hard
 622          *      links count, we cannot update the later one simply. Before LFSCK
 623          *      phase III finished, we cannot know whether there are some remote
 624          *      name entries to be repaired or not. LU-2914 */
 625                 if (rc == 0 && !lfsck_is_dead_obj(child) &&
 626                     ldata.ld_leh != NULL &&
 627                     ldata.ld_leh->leh_reccount != la->la_nlink)
 628                         CWARN("%.16s: the object "DFID" linkEA entry count %u "
 629                               "may not match its hardlink count %u\n",
 630                               lfsck_lfsck2name(lfsck), PFID(cfid),
 631                               ldata.ld_leh->leh_reccount, la->la_nlink);
 632
 633                 dt_write_unlock(env, child);
 634         }
 635
 636         if (handle != NULL)
 637                 dt_trans_stop(env, lfsck->li_next, handle);
 638
 639         if (rc == 0 && update) {
 640                 ns->ln_objs_nlink_repaired++;
 641                 rc = 1;
 642         }
 643
 644         return rc;
 645 }
 646
 647 /* namespace APIs */
 648
 649 static int lfsck_namespace_reset(const struct lu_env *env,
 650                                  struct lfsck_component *com, bool init)
 651 {
 652         struct lfsck_instance   *lfsck = com->lc_lfsck;
 653         struct lfsck_namespace  *ns    =
 654                                 (struct lfsck_namespace *)com->lc_file_ram;
 655         struct dt_object        *dto;
 656         int                      rc;
 657         ENTRY;
 658
 659         down_write(&com->lc_sem);
 660         if (init) {
 661                 memset(ns, 0, sizeof(*ns));
 662         } else {
 663                 __u32 count = ns->ln_success_count;
 664                 __u64 last_time = ns->ln_time_last_complete;
 665
 666                 memset(ns, 0, sizeof(*ns));
 667                 ns->ln_success_count = count;
 668                 ns->ln_time_last_complete = last_time;
 669         }
 670         ns->ln_magic = LFSCK_NAMESPACE_MAGIC;
 671         ns->ln_status = LS_INIT;
 672
 673         rc = local_object_unlink(env, lfsck->li_bottom, lfsck->li_local_root,
 674                                  lfsck_namespace_name);
 675         if (rc != 0)
 676                 GOTO(out, rc);
 677
 678         dto = local_index_find_or_create(env, lfsck->li_los, lfsck->li_local_root,
 679                                          lfsck_namespace_name,
 680                                          S_IFREG | S_IRUGO | S_IWUSR,
 681                                          &dt_lfsck_features);
 682         if (IS_ERR(dto))
 683                 GOTO(out, rc = PTR_ERR(dto));
 684
 685         com->lc_obj = dto;
 686         rc = dto->do_ops->do_index_try(env, dto, &dt_lfsck_features);
 687         if (rc != 0)
 688                 GOTO(out, rc);
 689
 690         rc = lfsck_namespace_store(env, com, true);
 691
 692         GOTO(out, rc);
 693
 694 out:
 695         up_write(&com->lc_sem);
 696         return rc;
 697 }
 698
 699 static void
 700 lfsck_namespace_fail(const struct lu_env *env, struct lfsck_component *com,
 701                      bool new_checked)
 702 {
 703         struct lfsck_namespace *ns = (struct lfsck_namespace *)com->lc_file_ram;
 704
 705         down_write(&com->lc_sem);
 706         if (new_checked)
 707                 com->lc_new_checked++;
 708         ns->ln_items_failed++;
 709         if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
 710                 lfsck_pos_fill(env, com->lc_lfsck,
 711                                &ns->ln_pos_first_inconsistent, false);
 712         up_write(&com->lc_sem);
 713 }
 714
 715 static int lfsck_namespace_checkpoint(const struct lu_env *env,
 716                                       struct lfsck_component *com, bool init)
 717 {
 718         struct lfsck_instance   *lfsck = com->lc_lfsck;
 719         struct lfsck_namespace  *ns    =
 720                                 (struct lfsck_namespace *)com->lc_file_ram;
 721         int                      rc;
 722
 723         if (com->lc_new_checked == 0 && !init)
 724                 return 0;
 725
 726         down_write(&com->lc_sem);
 727
 728         if (init) {
 729                 ns->ln_pos_latest_start = lfsck->li_pos_current;
 730         } else {
 731                 ns->ln_pos_last_checkpoint = lfsck->li_pos_current;
 732                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
 733                                 HALF_SEC - lfsck->li_time_last_checkpoint);
 734                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
 735                 ns->ln_items_checked += com->lc_new_checked;
 736                 com->lc_new_checked = 0;
 737         }
 738
 739         rc = lfsck_namespace_store(env, com, false);
 740
 741         up_write(&com->lc_sem);
 742         return rc;
 743 }
 744
 745 static int lfsck_namespace_prep(const struct lu_env *env,
 746                                 struct lfsck_component *com)
 747 {
 748         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 749         struct lfsck_namespace  *ns     =
 750                                 (struct lfsck_namespace *)com->lc_file_ram;
 751         struct lfsck_position   *pos    = &com->lc_pos_start;
 752
 753         if (ns->ln_status == LS_COMPLETED) {
 754                 int rc;
 755
 756                 rc = lfsck_namespace_reset(env, com, false);
 757                 if (rc != 0)
 758                         return rc;
 759         }
 760
 761         down_write(&com->lc_sem);
 762
 763         ns->ln_time_latest_start = cfs_time_current_sec();
 764
 765         spin_lock(&lfsck->li_lock);
 766         if (ns->ln_flags & LF_SCANNED_ONCE) {
 767                 if (!lfsck->li_drop_dryrun ||
 768                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
 769                         ns->ln_status = LS_SCANNING_PHASE2;
 770                         cfs_list_del_init(&com->lc_link);
 771                         cfs_list_add_tail(&com->lc_link,
 772                                           &lfsck->li_list_double_scan);
 773                         if (!cfs_list_empty(&com->lc_link_dir))
 774                                 cfs_list_del_init(&com->lc_link_dir);
 775                         lfsck_pos_set_zero(pos);
 776                 } else {
 777                         ns->ln_status = LS_SCANNING_PHASE1;
 778                         ns->ln_run_time_phase1 = 0;
 779                         ns->ln_run_time_phase2 = 0;
 780                         ns->ln_items_checked = 0;
 781                         ns->ln_items_repaired = 0;
 782                         ns->ln_items_failed = 0;
 783                         ns->ln_dirs_checked = 0;
 784                         ns->ln_mlinked_checked = 0;
 785                         ns->ln_objs_checked_phase2 = 0;
 786                         ns->ln_objs_repaired_phase2 = 0;
 787                         ns->ln_objs_failed_phase2 = 0;
 788                         ns->ln_objs_nlink_repaired = 0;
 789                         ns->ln_objs_lost_found = 0;
 790                         fid_zero(&ns->ln_fid_latest_scanned_phase2);
 791                         if (cfs_list_empty(&com->lc_link_dir))
 792                                 cfs_list_add_tail(&com->lc_link_dir,
 793                                                   &lfsck->li_list_dir);
 794                         *pos = ns->ln_pos_first_inconsistent;
 795                 }
 796         } else {
 797                 ns->ln_status = LS_SCANNING_PHASE1;
 798                 if (cfs_list_empty(&com->lc_link_dir))
 799                         cfs_list_add_tail(&com->lc_link_dir,
 800                                           &lfsck->li_list_dir);
 801                 if (!lfsck->li_drop_dryrun ||
 802                     lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent)) {
 803                         *pos = ns->ln_pos_last_checkpoint;
 804                         pos->lp_oit_cookie++;
 805                 } else {
 806                         *pos = ns->ln_pos_first_inconsistent;
 807                 }
 808         }
 809         spin_unlock(&lfsck->li_lock);
 810
 811         up_write(&com->lc_sem);
 812         return 0;
 813 }
 814
 815 static int lfsck_namespace_exec_oit(const struct lu_env *env,
 816                                     struct lfsck_component *com,
 817                                     struct dt_object *obj)
 818 {
 819         down_write(&com->lc_sem);
 820         com->lc_new_checked++;
 821         if (S_ISDIR(lfsck_object_type(obj)))
 822                 ((struct lfsck_namespace *)com->lc_file_ram)->ln_dirs_checked++;
 823         up_write(&com->lc_sem);
 824         return 0;
 825 }
 826
 827 static int lfsck_namespace_exec_dir(const struct lu_env *env,
 828                                     struct lfsck_component *com,
 829                                     struct dt_object *obj,
 830                                     struct lu_dirent *ent)
 831 {
 832         struct lfsck_thread_info   *info     = lfsck_env_info(env);
 833         struct lu_attr             *la       = &info->lti_la;
 834         struct lfsck_instance      *lfsck    = com->lc_lfsck;
 835         struct lfsck_bookmark      *bk       = &lfsck->li_bookmark_ram;
 836         struct lfsck_namespace     *ns       =
 837                                 (struct lfsck_namespace *)com->lc_file_ram;
 838         struct linkea_data          ldata    = { 0 };
 839         const struct lu_fid        *pfid     =
 840                                 lu_object_fid(&lfsck->li_obj_dir->do_lu);
 841         const struct lu_fid        *cfid     = lfsck_dto2fid(obj);
 842         const struct lu_name       *cname;
 843         struct thandle             *handle   = NULL;
 844         bool                        repaired = false;
 845         bool                        locked   = false;
 846         bool                        remove;
 847         bool                        newdata;
 848         int                         count    = 0;
 849         int                         rc;
 850         ENTRY;
 851
 852         cname = lfsck_name_get_const(env, ent->lde_name, ent->lde_namelen);
 853         down_write(&com->lc_sem);
 854         com->lc_new_checked++;
 855
 856         if (ent->lde_attrs & LUDA_UPGRADE) {
 857                 ns->ln_flags |= LF_UPGRADE;
 858                 repaired = true;
 859         } else if (ent->lde_attrs & LUDA_REPAIR) {
 860                 ns->ln_flags |= LF_INCONSISTENT;
 861                 repaired = true;
 862         }
 863
 864         if (ent->lde_name[0] == '.' &&
 865             (ent->lde_namelen == 1 ||
 866              (ent->lde_namelen == 2 && ent->lde_name[1] == '.') ||
 867              fid_is_dot_lustre(&ent->lde_fid)))
 868                 GOTO(out, rc = 0);
 869
 870         if (!(bk->lb_param & LPF_DRYRUN) &&
 871             (com->lc_journal || repaired)) {
 872
 873 again:
 874                 LASSERT(!locked);
 875
 876                 com->lc_journal = 1;
 877                 handle = dt_trans_create(env, lfsck->li_next);
 878                 if (IS_ERR(handle))
 879                         GOTO(out, rc = PTR_ERR(handle));
 880
 881                 rc = lfsck_declare_namespace_exec_dir(env, obj, handle);
 882                 if (rc != 0)
 883                         GOTO(stop, rc);
 884
 885                 rc = dt_trans_start(env, lfsck->li_next, handle);
 886                 if (rc != 0)
 887                         GOTO(stop, rc);
 888
 889                 dt_write_lock(env, obj, MOR_TGT_CHILD);
 890                 locked = true;
 891         }
 892
 893         rc = lfsck_namespace_check_exist(env, lfsck, obj, ent->lde_name);
 894         if (rc != 0)
 895                 GOTO(stop, rc);
 896
 897         rc = lfsck_links_read(env, obj, &ldata);
 898         if (rc == 0) {
 899                 count = ldata.ld_leh->leh_reccount;
 900                 rc = linkea_links_find(&ldata, cname, pfid);
 901                 if ((rc == 0) &&
 902                     (count == 1 || !S_ISDIR(lfsck_object_type(obj))))
 903                         goto record;
 904
 905                 ns->ln_flags |= LF_INCONSISTENT;
 906                 /* For dir, if there are more than one linkea entries, or the
 907                  * linkea entry does not match the name entry, then remove all
 908                  * and add the correct one. */
 909                 if (S_ISDIR(lfsck_object_type(obj))) {
 910                         remove = true;
 911                         newdata = true;
 912                 } else {
 913                         remove = false;
 914                         newdata = false;
 915                 }
 916                 goto nodata;
 917         } else if (unlikely(rc == -EINVAL)) {
 918                 count = 1;
 919                 ns->ln_flags |= LF_INCONSISTENT;
 920                 /* The magic crashed, we are not sure whether there are more
 921                  * corrupt data in the linkea, so remove all linkea entries. */
 922                 remove = true;
 923                 newdata = true;
 924                 goto nodata;
 925         } else if (rc == -ENODATA) {
 926                 count = 1;
 927                 ns->ln_flags |= LF_UPGRADE;
 928                 remove = false;
 929                 newdata = true;
 930
 931 nodata:
 932                 if (bk->lb_param & LPF_DRYRUN) {
 933                         repaired = true;
 934                         goto record;
 935                 }
 936
 937                 if (!com->lc_journal)
 938                         goto again;
 939
 940                 if (remove) {
 941                         LASSERT(newdata);
 942
 943                         rc = dt_xattr_del(env, obj, XATTR_NAME_LINK, handle,
 944                                           BYPASS_CAPA);
 945                         if (rc != 0)
 946                                 GOTO(stop, rc);
 947                 }
 948
 949                 if (newdata) {
 950                         rc = linkea_data_new(&ldata,
 951                                         &lfsck_env_info(env)->lti_linkea_buf);
 952                         if (rc != 0)
 953                                 GOTO(stop, rc);
 954                 }
 955
 956                 rc = linkea_add_buf(&ldata, cname, pfid);
 957                 if (rc != 0)
 958                         GOTO(stop, rc);
 959
 960                 rc = lfsck_links_write(env, obj, &ldata, handle);
 961                 if (rc != 0)
 962                         GOTO(stop, rc);
 963
 964                 count = ldata.ld_leh->leh_reccount;
 965                 repaired = true;
 966         } else {
 967                 GOTO(stop, rc);
 968         }
 969
 970 record:
 971         LASSERT(count > 0);
 972
 973         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
 974         if (rc != 0)
 975                 GOTO(stop, rc);
 976
 977         if ((count == 1) &&
 978             (la->la_nlink == 1 || S_ISDIR(lfsck_object_type(obj))))
 979                 /* Usually, it is for single linked object or dir, do nothing.*/
 980                 GOTO(stop, rc);
 981
 982         /* Following modification will be in another transaction.  */
 983         if (handle != NULL) {
 984                 LASSERT(dt_write_locked(env, obj));
 985
 986                 dt_write_unlock(env, obj);
 987                 locked = false;
 988
 989                 dt_trans_stop(env, lfsck->li_next, handle);
 990                 handle = NULL;
 991         }
 992
 993         ns->ln_mlinked_checked++;
 994         rc = lfsck_namespace_update(env, com, cfid,
 995                         count != la->la_nlink ? LLF_UNMATCH_NLINKS : 0, false);
 996
 997         GOTO(out, rc);
 998
 999 stop:
1000         if (locked)
1001                 dt_write_unlock(env, obj);
1002
1003         if (handle != NULL)
1004                 dt_trans_stop(env, lfsck->li_next, handle);
1005
1006 out:
1007         if (rc < 0) {
1008                 ns->ln_items_failed++;
1009                 if (lfsck_pos_is_zero(&ns->ln_pos_first_inconsistent))
1010                         lfsck_pos_fill(env, lfsck,
1011                                        &ns->ln_pos_first_inconsistent, false);
1012                 if (!(bk->lb_param & LPF_FAILOUT))
1013                         rc = 0;
1014         } else {
1015                 if (repaired)
1016                         ns->ln_items_repaired++;
1017                 else
1018                         com->lc_journal = 0;
1019                 rc = 0;
1020         }
1021         up_write(&com->lc_sem);
1022         return rc;
1023 }
1024
1025 static int lfsck_namespace_post(const struct lu_env *env,
1026                                 struct lfsck_component *com,
1027                                 int result, bool init)
1028 {
1029         struct lfsck_instance   *lfsck = com->lc_lfsck;
1030         struct lfsck_namespace  *ns    =
1031                                 (struct lfsck_namespace *)com->lc_file_ram;
1032         int                      rc;
1033
1034         down_write(&com->lc_sem);
1035
1036         spin_lock(&lfsck->li_lock);
1037         if (!init)
1038                 ns->ln_pos_last_checkpoint = lfsck->li_pos_current;
1039         if (result > 0) {
1040                 ns->ln_status = LS_SCANNING_PHASE2;
1041                 ns->ln_flags |= LF_SCANNED_ONCE;
1042                 ns->ln_flags &= ~LF_UPGRADE;
1043                 cfs_list_del_init(&com->lc_link);
1044                 cfs_list_del_init(&com->lc_link_dir);
1045                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_double_scan);
1046         } else if (result == 0) {
1047                 if (lfsck->li_paused) {
1048                         ns->ln_status = LS_PAUSED;
1049                 } else {
1050                         ns->ln_status = LS_STOPPED;
1051                         cfs_list_del_init(&com->lc_link);
1052                         cfs_list_del_init(&com->lc_link_dir);
1053                         cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1054                 }
1055         } else {
1056                 ns->ln_status = LS_FAILED;
1057                 cfs_list_del_init(&com->lc_link);
1058                 cfs_list_del_init(&com->lc_link_dir);
1059                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1060         }
1061         spin_unlock(&lfsck->li_lock);
1062
1063         if (!init) {
1064                 ns->ln_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
1065                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1066                 ns->ln_time_last_checkpoint = cfs_time_current_sec();
1067                 ns->ln_items_checked += com->lc_new_checked;
1068                 com->lc_new_checked = 0;
1069         }
1070
1071         rc = lfsck_namespace_store(env, com, false);
1072
1073         up_write(&com->lc_sem);
1074         return rc;
1075 }
1076
1077 static int
1078 lfsck_namespace_dump(const struct lu_env *env, struct lfsck_component *com,
1079                      char *buf, int len)
1080 {
1081         struct lfsck_instance   *lfsck = com->lc_lfsck;
1082         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
1083         struct lfsck_namespace  *ns    =
1084                                 (struct lfsck_namespace *)com->lc_file_ram;
1085         int                      save  = len;
1086         int                      ret   = -ENOSPC;
1087         int                      rc;
1088
1089         down_read(&com->lc_sem);
1090         rc = snprintf(buf, len,
1091                       "name: lfsck_namespace\n"
1092                       "magic: 0x%x\n"
1093                       "version: %d\n"
1094                       "status: %s\n",
1095                       ns->ln_magic,
1096                       bk->lb_version,
1097                       lfsck_status_names[ns->ln_status]);
1098         if (rc <= 0)
1099                 goto out;
1100
1101         buf += rc;
1102         len -= rc;
1103         rc = lfsck_bits_dump(&buf, &len, ns->ln_flags, lfsck_flags_names,
1104                              "flags");
1105         if (rc < 0)
1106                 goto out;
1107
1108         rc = lfsck_bits_dump(&buf, &len, bk->lb_param, lfsck_param_names,
1109                              "param");
1110         if (rc < 0)
1111                 goto out;
1112
1113         rc = lfsck_time_dump(&buf, &len, ns->ln_time_last_complete,
1114                              "time_since_last_completed");
1115         if (rc < 0)
1116                 goto out;
1117
1118         rc = lfsck_time_dump(&buf, &len, ns->ln_time_latest_start,
1119                              "time_since_latest_start");
1120         if (rc < 0)
1121                 goto out;
1122
1123         rc = lfsck_time_dump(&buf, &len, ns->ln_time_last_checkpoint,
1124                              "time_since_last_checkpoint");
1125         if (rc < 0)
1126                 goto out;
1127
1128         rc = lfsck_pos_dump(&buf, &len, &ns->ln_pos_latest_start,
1129                             "latest_start_position");
1130         if (rc < 0)
1131                 goto out;
1132
1133         rc = lfsck_pos_dump(&buf, &len, &ns->ln_pos_last_checkpoint,
1134                             "last_checkpoint_position");
1135         if (rc < 0)
1136                 goto out;
1137
1138         rc = lfsck_pos_dump(&buf, &len, &ns->ln_pos_first_inconsistent,
1139                             "first_failure_position");
1140         if (rc < 0)
1141                 goto out;
1142
1143         if (ns->ln_status == LS_SCANNING_PHASE1) {
1144                 struct lfsck_position pos;
1145                 const struct dt_it_ops *iops;
1146                 cfs_duration_t duration = cfs_time_current() -
1147                                           lfsck->li_time_last_checkpoint;
1148                 __u64 checked = ns->ln_items_checked + com->lc_new_checked;
1149                 __u64 speed = checked;
1150                 __u64 new_checked = com->lc_new_checked * HZ;
1151                 __u32 rtime = ns->ln_run_time_phase1 +
1152                               cfs_duration_sec(duration + HALF_SEC);
1153
1154                 if (duration != 0)
1155                         do_div(new_checked, duration);
1156                 if (rtime != 0)
1157                         do_div(speed, rtime);
1158                 rc = snprintf(buf, len,
1159                               "checked_phase1: "LPU64"\n"
1160                               "checked_phase2: "LPU64"\n"
1161                               "updated_phase1: "LPU64"\n"
1162                               "updated_phase2: "LPU64"\n"
1163                               "failed_phase1: "LPU64"\n"
1164                               "failed_phase2: "LPU64"\n"
1165                               "dirs: "LPU64"\n"
1166                               "M-linked: "LPU64"\n"
1167                               "nlinks_repaired: "LPU64"\n"
1168                               "lost_found: "LPU64"\n"
1169                               "success_count: %u\n"
1170                               "run_time_phase1: %u seconds\n"
1171                               "run_time_phase2: %u seconds\n"
1172                               "average_speed_phase1: "LPU64" items/sec\n"
1173                               "average_speed_phase2: N/A\n"
1174                               "real-time_speed_phase1: "LPU64" items/sec\n"
1175                               "real-time_speed_phase2: N/A\n",
1176                               checked,
1177                               ns->ln_objs_checked_phase2,
1178                               ns->ln_items_repaired,
1179                               ns->ln_objs_repaired_phase2,
1180                               ns->ln_items_failed,
1181                               ns->ln_objs_failed_phase2,
1182                               ns->ln_dirs_checked,
1183                               ns->ln_mlinked_checked,
1184                               ns->ln_objs_nlink_repaired,
1185                               ns->ln_objs_lost_found,
1186                               ns->ln_success_count,
1187                               rtime,
1188                               ns->ln_run_time_phase2,
1189                               speed,
1190                               new_checked);
1191                 if (rc <= 0)
1192                         goto out;
1193
1194                 buf += rc;
1195                 len -= rc;
1196
1197                 LASSERT(lfsck->li_di_oit != NULL);
1198
1199                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
1200
1201                 /* The low layer otable-based iteration position may NOT
1202                  * exactly match the namespace-based directory traversal
1203                  * cookie. Generally, it is not a serious issue. But the
1204                  * caller should NOT make assumption on that. */
1205                 pos.lp_oit_cookie = iops->store(env, lfsck->li_di_oit);
1206                 if (!lfsck->li_current_oit_processed)
1207                         pos.lp_oit_cookie--;
1208
1209                 spin_lock(&lfsck->li_lock);
1210                 if (lfsck->li_di_dir != NULL) {
1211                         pos.lp_dir_cookie = lfsck->li_cookie_dir;
1212                         if (pos.lp_dir_cookie >= MDS_DIR_END_OFF) {
1213                                 fid_zero(&pos.lp_dir_parent);
1214                                 pos.lp_dir_cookie = 0;
1215                         } else {
1216                                 pos.lp_dir_parent =
1217                                 *lu_object_fid(&lfsck->li_obj_dir->do_lu);
1218                         }
1219                 } else {
1220                         fid_zero(&pos.lp_dir_parent);
1221                         pos.lp_dir_cookie = 0;
1222                 }
1223                 spin_unlock(&lfsck->li_lock);
1224                 rc = lfsck_pos_dump(&buf, &len, &pos, "current_position");
1225                 if (rc <= 0)
1226                         goto out;
1227         } else if (ns->ln_status == LS_SCANNING_PHASE2) {
1228                 cfs_duration_t duration = cfs_time_current() -
1229                                           lfsck->li_time_last_checkpoint;
1230                 __u64 checked = ns->ln_objs_checked_phase2 +
1231                                 com->lc_new_checked;
1232                 __u64 speed1 = ns->ln_items_checked;
1233                 __u64 speed2 = checked;
1234                 __u64 new_checked = com->lc_new_checked * HZ;
1235                 __u32 rtime = ns->ln_run_time_phase2 +
1236                               cfs_duration_sec(duration + HALF_SEC);
1237
1238                 if (duration != 0)
1239                         do_div(new_checked, duration);
1240                 if (ns->ln_run_time_phase1 != 0)
1241                         do_div(speed1, ns->ln_run_time_phase1);
1242                 if (rtime != 0)
1243                         do_div(speed2, rtime);
1244                 rc = snprintf(buf, len,
1245                               "checked_phase1: "LPU64"\n"
1246                               "checked_phase2: "LPU64"\n"
1247                               "updated_phase1: "LPU64"\n"
1248                               "updated_phase2: "LPU64"\n"
1249                               "failed_phase1: "LPU64"\n"
1250                               "failed_phase2: "LPU64"\n"
1251                               "dirs: "LPU64"\n"
1252                               "M-linked: "LPU64"\n"
1253                               "nlinks_repaired: "LPU64"\n"
1254                               "lost_found: "LPU64"\n"
1255                               "success_count: %u\n"
1256                               "run_time_phase1: %u seconds\n"
1257                               "run_time_phase2: %u seconds\n"
1258                               "average_speed_phase1: "LPU64" items/sec\n"
1259                               "average_speed_phase2: "LPU64" objs/sec\n"
1260                               "real-time_speed_phase1: N/A\n"
1261                               "real-time_speed_phase2: "LPU64" objs/sec\n"
1262                               "current_position: "DFID"\n",
1263                               ns->ln_items_checked,
1264                               checked,
1265                               ns->ln_items_repaired,
1266                               ns->ln_objs_repaired_phase2,
1267                               ns->ln_items_failed,
1268                               ns->ln_objs_failed_phase2,
1269                               ns->ln_dirs_checked,
1270                               ns->ln_mlinked_checked,
1271                               ns->ln_objs_nlink_repaired,
1272                               ns->ln_objs_lost_found,
1273                               ns->ln_success_count,
1274                               ns->ln_run_time_phase1,
1275                               rtime,
1276                               speed1,
1277                               speed2,
1278                               new_checked,
1279                               PFID(&ns->ln_fid_latest_scanned_phase2));
1280                 if (rc <= 0)
1281                         goto out;
1282
1283                 buf += rc;
1284                 len -= rc;
1285         } else {
1286                 __u64 speed1 = ns->ln_items_checked;
1287                 __u64 speed2 = ns->ln_objs_checked_phase2;
1288
1289                 if (ns->ln_run_time_phase1 != 0)
1290                         do_div(speed1, ns->ln_run_time_phase1);
1291                 if (ns->ln_run_time_phase2 != 0)
1292                         do_div(speed2, ns->ln_run_time_phase2);
1293                 rc = snprintf(buf, len,
1294                               "checked_phase1: "LPU64"\n"
1295                               "checked_phase2: "LPU64"\n"
1296                               "updated_phase1: "LPU64"\n"
1297                               "updated_phase2: "LPU64"\n"
1298                               "failed_phase1: "LPU64"\n"
1299                               "failed_phase2: "LPU64"\n"
1300                               "dirs: "LPU64"\n"
1301                               "M-linked: "LPU64"\n"
1302                               "nlinks_repaired: "LPU64"\n"
1303                               "lost_found: "LPU64"\n"
1304                               "success_count: %u\n"
1305                               "run_time_phase1: %u seconds\n"
1306                               "run_time_phase2: %u seconds\n"
1307                               "average_speed_phase1: "LPU64" items/sec\n"
1308                               "average_speed_phase2: "LPU64" objs/sec\n"
1309                               "real-time_speed_phase1: N/A\n"
1310                               "real-time_speed_phase2: N/A\n"
1311                               "current_position: N/A\n",
1312                               ns->ln_items_checked,
1313                               ns->ln_objs_checked_phase2,
1314                               ns->ln_items_repaired,
1315                               ns->ln_objs_repaired_phase2,
1316                               ns->ln_items_failed,
1317                               ns->ln_objs_failed_phase2,
1318                               ns->ln_dirs_checked,
1319                               ns->ln_mlinked_checked,
1320                               ns->ln_objs_nlink_repaired,
1321                               ns->ln_objs_lost_found,
1322                               ns->ln_success_count,
1323                               ns->ln_run_time_phase1,
1324                               ns->ln_run_time_phase2,
1325                               speed1,
1326                               speed2);
1327                 if (rc <= 0)
1328                         goto out;
1329
1330                 buf += rc;
1331                 len -= rc;
1332         }
1333         ret = save - len;
1334
1335 out:
1336         up_read(&com->lc_sem);
1337         return ret;
1338 }
1339
1340 static int lfsck_namespace_double_scan(const struct lu_env *env,
1341                                        struct lfsck_component *com)
1342 {
1343         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1344         struct ptlrpc_thread    *thread = &lfsck->li_thread;
1345         struct lfsck_bookmark   *bk     = &lfsck->li_bookmark_ram;
1346         struct lfsck_namespace  *ns     =
1347                                 (struct lfsck_namespace *)com->lc_file_ram;
1348         struct dt_object        *obj    = com->lc_obj;
1349         const struct dt_it_ops  *iops   = &obj->do_index_ops->dio_it;
1350         struct dt_object        *target;
1351         struct dt_it            *di;
1352         struct dt_key           *key;
1353         struct lu_fid            fid;
1354         int                      rc;
1355         __u8                     flags;
1356         ENTRY;
1357
1358         lfsck->li_new_scanned = 0;
1359         lfsck->li_time_last_checkpoint = cfs_time_current();
1360         lfsck->li_time_next_checkpoint = lfsck->li_time_last_checkpoint +
1361                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1362
1363         di = iops->init(env, obj, 0, BYPASS_CAPA);
1364         if (IS_ERR(di))
1365                 RETURN(PTR_ERR(di));
1366
1367         fid_cpu_to_be(&fid, &ns->ln_fid_latest_scanned_phase2);
1368         rc = iops->get(env, di, (const struct dt_key *)&fid);
1369         if (rc < 0)
1370                 GOTO(fini, rc);
1371
1372         /* Skip the start one, which either has been processed or non-exist. */
1373         rc = iops->next(env, di);
1374         if (rc != 0)
1375                 GOTO(put, rc);
1376
1377         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_NO_DOUBLESCAN))
1378                 GOTO(put, rc = 0);
1379
1380         do {
1381                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY3) &&
1382                     cfs_fail_val > 0) {
1383                         struct l_wait_info lwi;
1384
1385                         lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val),
1386                                           NULL, NULL);
1387                         l_wait_event(thread->t_ctl_waitq,
1388                                      !thread_is_running(thread),
1389                                      &lwi);
1390                 }
1391
1392                 key = iops->key(env, di);
1393                 fid_be_to_cpu(&fid, (const struct lu_fid *)key);
1394                 target = lfsck_object_find(env, lfsck, &fid);
1395                 down_write(&com->lc_sem);
1396                 if (target == NULL) {
1397                         rc = 0;
1398                         goto checkpoint;
1399                 } else if (IS_ERR(target)) {
1400                         rc = PTR_ERR(target);
1401                         goto checkpoint;
1402                 }
1403
1404                 /* XXX: Currently, skip remote object, the consistency for
1405                  *      remote object will be processed in LFSCK phase III. */
1406                 if (dt_object_exists(target) && !dt_object_remote(target)) {
1407                         rc = iops->rec(env, di, (struct dt_rec *)&flags, 0);
1408                         if (rc == 0)
1409                                 rc = lfsck_namespace_double_scan_one(env, com,
1410                                                                 target, flags);
1411                 }
1412
1413                 lfsck_object_put(env, target);
1414
1415 checkpoint:
1416                 lfsck->li_new_scanned++;
1417                 com->lc_new_checked++;
1418                 ns->ln_fid_latest_scanned_phase2 = fid;
1419                 if (rc > 0)
1420                         ns->ln_objs_repaired_phase2++;
1421                 else if (rc < 0)
1422                         ns->ln_objs_failed_phase2++;
1423                 up_write(&com->lc_sem);
1424
1425                 if ((rc == 0) || ((rc > 0) && !(bk->lb_param & LPF_DRYRUN))) {
1426                         lfsck_namespace_delete(env, com, &fid);
1427                 } else if (rc < 0) {
1428                         flags |= LLF_REPAIR_FAILED;
1429                         lfsck_namespace_update(env, com, &fid, flags, true);
1430                 }
1431
1432                 if (rc < 0 && bk->lb_param & LPF_FAILOUT)
1433                         GOTO(put, rc);
1434
1435                 if (unlikely(cfs_time_beforeq(lfsck->li_time_next_checkpoint,
1436                                               cfs_time_current())) &&
1437                     com->lc_new_checked != 0) {
1438                         down_write(&com->lc_sem);
1439                         ns->ln_run_time_phase2 +=
1440                                 cfs_duration_sec(cfs_time_current() +
1441                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1442                         ns->ln_time_last_checkpoint = cfs_time_current_sec();
1443                         ns->ln_objs_checked_phase2 += com->lc_new_checked;
1444                         com->lc_new_checked = 0;
1445                         rc = lfsck_namespace_store(env, com, false);
1446                         up_write(&com->lc_sem);
1447                         if (rc != 0)
1448                                 GOTO(put, rc);
1449
1450                         lfsck->li_time_last_checkpoint = cfs_time_current();
1451                         lfsck->li_time_next_checkpoint =
1452                                 lfsck->li_time_last_checkpoint +
1453                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
1454                 }
1455
1456                 lfsck_control_speed(lfsck);
1457                 if (unlikely(!thread_is_running(thread)))
1458                         GOTO(put, rc = 0);
1459
1460                 rc = iops->next(env, di);
1461         } while (rc == 0);
1462
1463         GOTO(put, rc);
1464
1465 put:
1466         iops->put(env, di);
1467
1468 fini:
1469         iops->fini(env, di);
1470         down_write(&com->lc_sem);
1471
1472         ns->ln_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
1473                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1474         ns->ln_time_last_checkpoint = cfs_time_current_sec();
1475         ns->ln_objs_checked_phase2 += com->lc_new_checked;
1476         com->lc_new_checked = 0;
1477
1478         if (rc > 0) {
1479                 com->lc_journal = 0;
1480                 ns->ln_status = LS_COMPLETED;
1481                 if (!(bk->lb_param & LPF_DRYRUN))
1482                         ns->ln_flags &=
1483                         ~(LF_SCANNED_ONCE | LF_INCONSISTENT | LF_UPGRADE);
1484                 ns->ln_time_last_complete = ns->ln_time_last_checkpoint;
1485                 ns->ln_success_count++;
1486         } else if (rc == 0) {
1487                 if (lfsck->li_paused)
1488                         ns->ln_status = LS_PAUSED;
1489                 else
1490                         ns->ln_status = LS_STOPPED;
1491         } else {
1492                 ns->ln_status = LS_FAILED;
1493         }
1494
1495         if (ns->ln_status != LS_PAUSED) {
1496                 spin_lock(&lfsck->li_lock);
1497                 cfs_list_del_init(&com->lc_link);
1498                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1499                 spin_unlock(&lfsck->li_lock);
1500         }
1501
1502         rc = lfsck_namespace_store(env, com, false);
1503
1504         up_write(&com->lc_sem);
1505         return rc;
1506 }
1507
1508 static struct lfsck_operations lfsck_namespace_ops = {
1509         .lfsck_reset            = lfsck_namespace_reset,
1510         .lfsck_fail             = lfsck_namespace_fail,
1511         .lfsck_checkpoint       = lfsck_namespace_checkpoint,
1512         .lfsck_prep             = lfsck_namespace_prep,
1513         .lfsck_exec_oit         = lfsck_namespace_exec_oit,
1514         .lfsck_exec_dir         = lfsck_namespace_exec_dir,
1515         .lfsck_post             = lfsck_namespace_post,
1516         .lfsck_dump             = lfsck_namespace_dump,
1517         .lfsck_double_scan      = lfsck_namespace_double_scan,
1518 };
1519
1520 int lfsck_namespace_setup(const struct lu_env *env,
1521                           struct lfsck_instance *lfsck)
1522 {
1523         struct lfsck_component  *com;
1524         struct lfsck_namespace  *ns;
1525         struct dt_object        *obj;
1526         int                      rc;
1527         ENTRY;
1528
1529         LASSERT(lfsck->li_master);
1530
1531         OBD_ALLOC_PTR(com);
1532         if (com == NULL)
1533                 RETURN(-ENOMEM);
1534
1535         CFS_INIT_LIST_HEAD(&com->lc_link);
1536         CFS_INIT_LIST_HEAD(&com->lc_link_dir);
1537         init_rwsem(&com->lc_sem);
1538         atomic_set(&com->lc_ref, 1);
1539         com->lc_lfsck = lfsck;
1540         com->lc_type = LT_NAMESPACE;
1541         com->lc_ops = &lfsck_namespace_ops;
1542         com->lc_file_size = sizeof(struct lfsck_namespace);
1543         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
1544         if (com->lc_file_ram == NULL)
1545                 GOTO(out, rc = -ENOMEM);
1546
1547         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
1548         if (com->lc_file_disk == NULL)
1549                 GOTO(out, rc = -ENOMEM);
1550
1551         obj = local_index_find_or_create(env, lfsck->li_los,
1552                                          lfsck->li_local_root,
1553                                          lfsck_namespace_name,
1554                                          S_IFREG | S_IRUGO | S_IWUSR,
1555                                          &dt_lfsck_features);
1556         if (IS_ERR(obj))
1557                 GOTO(out, rc = PTR_ERR(obj));
1558
1559         com->lc_obj = obj;
1560         rc = obj->do_ops->do_index_try(env, obj, &dt_lfsck_features);
1561         if (rc != 0)
1562                 GOTO(out, rc);
1563
1564         rc = lfsck_namespace_load(env, com);
1565         if (rc > 0)
1566                 rc = lfsck_namespace_reset(env, com, true);
1567         else if (rc == -ENODATA)
1568                 rc = lfsck_namespace_init(env, com);
1569         if (rc != 0)
1570                 GOTO(out, rc);
1571
1572         ns = (struct lfsck_namespace *)com->lc_file_ram;
1573         switch (ns->ln_status) {
1574         case LS_INIT:
1575         case LS_COMPLETED:
1576         case LS_FAILED:
1577         case LS_STOPPED:
1578                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1579                 break;
1580         default:
1581                 CERROR("%s: unknown lfsck_namespace status: %u\n",
1582                        lfsck_lfsck2name(lfsck), ns->ln_status);
1583                 /* fall through */
1584         case LS_SCANNING_PHASE1:
1585         case LS_SCANNING_PHASE2:
1586                 /* No need to store the status to disk right now.
1587                  * If the system crashed before the status stored,
1588                  * it will be loaded back when next time. */
1589                 ns->ln_status = LS_CRASHED;
1590                 /* fall through */
1591         case LS_PAUSED:
1592         case LS_CRASHED:
1593                 cfs_list_add_tail(&com->lc_link, &lfsck->li_list_scan);
1594                 cfs_list_add_tail(&com->lc_link_dir, &lfsck->li_list_dir);
1595                 break;
1596         }
1597
1598         GOTO(out, rc = 0);
1599
1600 out:
1601         if (rc != 0)
1602                 lfsck_component_cleanup(env, com);
1603         return rc;
1604 }