lustre/lfsck/lfsck_layout.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) 2013, Intel Corporation.
  24  */
  25 /*
  26  * lustre/lfsck/lfsck_layout.c
  27  *
  28  * Author: Fan, Yong <fan.yong@intel.com>
  29  */
  30
  31 #ifndef EXPORT_SYMTAB
  32 # define EXPORT_SYMTAB
  33 #endif
  34 #define DEBUG_SUBSYSTEM S_LFSCK
  35
  36 #include <linux/bitops.h>
  37
  38 #include <lustre/lustre_idl.h>
  39 #include <lu_object.h>
  40 #include <dt_object.h>
  41 #include <lustre_linkea.h>
  42 #include <lustre_fid.h>
  43 #include <lustre_lib.h>
  44 #include <lustre_net.h>
  45 #include <lustre/lustre_user.h>
  46 #include <md_object.h>
  47 #include <obd_class.h>
  48
  49 #include "lfsck_internal.h"
  50
  51 #define LFSCK_LAYOUT_MAGIC              0xB173AE14
  52
  53 static const char lfsck_layout_name[] = "lfsck_layout";
  54
  55 struct lfsck_layout_seq {
  56         struct list_head         lls_list;
  57         __u64                    lls_seq;
  58         __u64                    lls_lastid;
  59         __u64                    lls_lastid_known;
  60         struct dt_object        *lls_lastid_obj;
  61         unsigned int             lls_dirty:1;
  62 };
  63
  64 struct lfsck_layout_slave_target {
  65         /* link into lfsck_layout_slave_data::llsd_master_list. */
  66         struct list_head        llst_list;
  67         __u64                   llst_gen;
  68         atomic_t                llst_ref;
  69         __u32                   llst_index;
  70 };
  71
  72 struct lfsck_layout_slave_data {
  73         /* list for lfsck_layout_seq */
  74         struct list_head         llsd_seq_list;
  75
  76         /* list for the masters involve layout verification. */
  77         struct list_head         llsd_master_list;
  78         spinlock_t               llsd_lock;
  79         __u64                    llsd_touch_gen;
  80 };
  81
  82 struct lfsck_layout_object {
  83         struct dt_object        *llo_obj;
  84         struct lu_attr           llo_attr;
  85         atomic_t                 llo_ref;
  86         __u16                    llo_gen;
  87 };
  88
  89 struct lfsck_layout_req {
  90         struct list_head                 llr_list;
  91         struct lfsck_layout_object      *llr_parent;
  92         struct dt_object                *llr_child;
  93         __u32                            llr_ost_idx;
  94         __u32                            llr_lov_idx; /* offset in LOV EA */
  95 };
  96
  97 struct lfsck_layout_master_data {
  98         spinlock_t              llmd_lock;
  99         struct list_head        llmd_req_list;
 100
 101         /* list for the ost targets involve layout verification. */
 102         struct list_head        llmd_ost_list;
 103
 104         /* list for the ost targets in phase1 scanning. */
 105         struct list_head        llmd_ost_phase1_list;
 106
 107         /* list for the ost targets in phase1 scanning. */
 108         struct list_head        llmd_ost_phase2_list;
 109
 110         struct ptlrpc_thread    llmd_thread;
 111         atomic_t                llmd_rpcs_in_flight;
 112         __u32                   llmd_touch_gen;
 113         int                     llmd_prefetched;
 114         int                     llmd_assistant_status;
 115         int                     llmd_post_result;
 116         unsigned int            llmd_to_post:1,
 117                                 llmd_to_double_scan:1,
 118                                 llmd_in_double_scan:1,
 119                                 llmd_exit:1;
 120 };
 121
 122 struct lfsck_layout_slave_async_args {
 123         struct obd_export                *llsaa_exp;
 124         struct lfsck_component           *llsaa_com;
 125         struct lfsck_layout_slave_target *llsaa_llst;
 126 };
 127
 128 static inline void
 129 lfsck_layout_llst_put(struct lfsck_layout_slave_target *llst)
 130 {
 131         if (atomic_dec_and_test(&llst->llst_ref)) {
 132                 LASSERT(list_empty(&llst->llst_list));
 133
 134                 OBD_FREE_PTR(llst);
 135         }
 136 }
 137
 138 static inline int
 139 lfsck_layout_llst_add(struct lfsck_layout_slave_data *llsd, __u32 index)
 140 {
 141         struct lfsck_layout_slave_target *llst;
 142         struct lfsck_layout_slave_target *tmp;
 143         int                               rc   = 0;
 144
 145         OBD_ALLOC_PTR(llst);
 146         if (llst == NULL)
 147                 return -ENOMEM;
 148
 149         INIT_LIST_HEAD(&llst->llst_list);
 150         llst->llst_gen = 0;
 151         llst->llst_index = index;
 152         atomic_set(&llst->llst_ref, 1);
 153
 154         spin_lock(&llsd->llsd_lock);
 155         list_for_each_entry(tmp, &llsd->llsd_master_list, llst_list) {
 156                 if (tmp->llst_index == index) {
 157                         rc = -EALREADY;
 158                         break;
 159                 }
 160         }
 161         if (rc == 0)
 162                 list_add_tail(&llst->llst_list, &llsd->llsd_master_list);
 163         spin_unlock(&llsd->llsd_lock);
 164
 165         if (rc != 0)
 166                 OBD_FREE_PTR(llst);
 167
 168         return rc;
 169 }
 170
 171 static inline void
 172 lfsck_layout_llst_del(struct lfsck_layout_slave_data *llsd,
 173                       struct lfsck_layout_slave_target *llst)
 174 {
 175         bool del = false;
 176
 177         spin_lock(&llsd->llsd_lock);
 178         if (!list_empty(&llst->llst_list)) {
 179                 list_del_init(&llst->llst_list);
 180                 del = true;
 181         }
 182         spin_unlock(&llsd->llsd_lock);
 183
 184         if (del)
 185                 lfsck_layout_llst_put(llst);
 186 }
 187
 188 static inline struct lfsck_layout_slave_target *
 189 lfsck_layout_llst_find_and_del(struct lfsck_layout_slave_data *llsd,
 190                                __u32 index)
 191 {
 192         struct lfsck_layout_slave_target *llst;
 193
 194         spin_lock(&llsd->llsd_lock);
 195         list_for_each_entry(llst, &llsd->llsd_master_list, llst_list) {
 196                 if (llst->llst_index == index) {
 197                         list_del_init(&llst->llst_list);
 198                         spin_unlock(&llsd->llsd_lock);
 199
 200                         return llst;
 201                 }
 202         }
 203         spin_unlock(&llsd->llsd_lock);
 204
 205         return NULL;
 206 }
 207
 208 static inline void lfsck_layout_object_put(const struct lu_env *env,
 209                                            struct lfsck_layout_object *llo)
 210 {
 211         if (atomic_dec_and_test(&llo->llo_ref)) {
 212                 lfsck_object_put(env, llo->llo_obj);
 213                 OBD_FREE_PTR(llo);
 214         }
 215 }
 216
 217 static inline void lfsck_layout_req_fini(const struct lu_env *env,
 218                                          struct lfsck_layout_req *llr)
 219 {
 220         lu_object_put(env, &llr->llr_child->do_lu);
 221         lfsck_layout_object_put(env, llr->llr_parent);
 222         OBD_FREE_PTR(llr);
 223 }
 224
 225 static inline bool lfsck_layout_req_empty(struct lfsck_layout_master_data *llmd)
 226 {
 227         bool empty = false;
 228
 229         spin_lock(&llmd->llmd_lock);
 230         if (list_empty(&llmd->llmd_req_list))
 231                 empty = true;
 232         spin_unlock(&llmd->llmd_lock);
 233
 234         return empty;
 235 }
 236
 237 static void lfsck_layout_le_to_cpu(struct lfsck_layout *des,
 238                                    const struct lfsck_layout *src)
 239 {
 240         int i;
 241
 242         des->ll_magic = le32_to_cpu(src->ll_magic);
 243         des->ll_status = le32_to_cpu(src->ll_status);
 244         des->ll_flags = le32_to_cpu(src->ll_flags);
 245         des->ll_success_count = le32_to_cpu(src->ll_success_count);
 246         des->ll_run_time_phase1 = le32_to_cpu(src->ll_run_time_phase1);
 247         des->ll_run_time_phase2 = le32_to_cpu(src->ll_run_time_phase2);
 248         des->ll_time_last_complete = le64_to_cpu(src->ll_time_last_complete);
 249         des->ll_time_latest_start = le64_to_cpu(src->ll_time_latest_start);
 250         des->ll_time_last_checkpoint =
 251                                 le64_to_cpu(src->ll_time_last_checkpoint);
 252         des->ll_pos_latest_start = le64_to_cpu(src->ll_pos_latest_start);
 253         des->ll_pos_last_checkpoint = le64_to_cpu(src->ll_pos_last_checkpoint);
 254         des->ll_pos_first_inconsistent =
 255                         le64_to_cpu(src->ll_pos_first_inconsistent);
 256         des->ll_objs_checked_phase1 = le64_to_cpu(src->ll_objs_checked_phase1);
 257         des->ll_objs_failed_phase1 = le64_to_cpu(src->ll_objs_failed_phase1);
 258         des->ll_objs_checked_phase2 = le64_to_cpu(src->ll_objs_checked_phase2);
 259         des->ll_objs_failed_phase2 = le64_to_cpu(src->ll_objs_failed_phase2);
 260         for (i = 0; i < LLIT_MAX; i++)
 261                 des->ll_objs_repaired[i] =
 262                                 le64_to_cpu(src->ll_objs_repaired[i]);
 263         des->ll_objs_skipped = le64_to_cpu(src->ll_objs_skipped);
 264 }
 265
 266 static void lfsck_layout_cpu_to_le(struct lfsck_layout *des,
 267                                    const struct lfsck_layout *src)
 268 {
 269         int i;
 270
 271         des->ll_magic = cpu_to_le32(src->ll_magic);
 272         des->ll_status = cpu_to_le32(src->ll_status);
 273         des->ll_flags = cpu_to_le32(src->ll_flags);
 274         des->ll_success_count = cpu_to_le32(src->ll_success_count);
 275         des->ll_run_time_phase1 = cpu_to_le32(src->ll_run_time_phase1);
 276         des->ll_run_time_phase2 = cpu_to_le32(src->ll_run_time_phase2);
 277         des->ll_time_last_complete = cpu_to_le64(src->ll_time_last_complete);
 278         des->ll_time_latest_start = cpu_to_le64(src->ll_time_latest_start);
 279         des->ll_time_last_checkpoint =
 280                                 cpu_to_le64(src->ll_time_last_checkpoint);
 281         des->ll_pos_latest_start = cpu_to_le64(src->ll_pos_latest_start);
 282         des->ll_pos_last_checkpoint = cpu_to_le64(src->ll_pos_last_checkpoint);
 283         des->ll_pos_first_inconsistent =
 284                         cpu_to_le64(src->ll_pos_first_inconsistent);
 285         des->ll_objs_checked_phase1 = cpu_to_le64(src->ll_objs_checked_phase1);
 286         des->ll_objs_failed_phase1 = cpu_to_le64(src->ll_objs_failed_phase1);
 287         des->ll_objs_checked_phase2 = cpu_to_le64(src->ll_objs_checked_phase2);
 288         des->ll_objs_failed_phase2 = cpu_to_le64(src->ll_objs_failed_phase2);
 289         for (i = 0; i < LLIT_MAX; i++)
 290                 des->ll_objs_repaired[i] =
 291                                 cpu_to_le64(src->ll_objs_repaired[i]);
 292         des->ll_objs_skipped = cpu_to_le64(src->ll_objs_skipped);
 293 }
 294
 295 /**
 296  * \retval +ve: the lfsck_layout is broken, the caller should reset it.
 297  * \retval 0: succeed.
 298  * \retval -ve: failed cases.
 299  */
 300 static int lfsck_layout_load(const struct lu_env *env,
 301                              struct lfsck_component *com)
 302 {
 303         struct lfsck_layout             *lo     = com->lc_file_ram;
 304         const struct dt_body_operations *dbo    = com->lc_obj->do_body_ops;
 305         ssize_t                          size   = com->lc_file_size;
 306         loff_t                           pos    = 0;
 307         int                              rc;
 308
 309         rc = dbo->dbo_read(env, com->lc_obj,
 310                            lfsck_buf_get(env, com->lc_file_disk, size), &pos,
 311                            BYPASS_CAPA);
 312         if (rc == 0) {
 313                 return -ENOENT;
 314         } else if (rc < 0) {
 315                 CWARN("%s: failed to load lfsck_layout: rc = %d\n",
 316                       lfsck_lfsck2name(com->lc_lfsck), rc);
 317                 return rc;
 318         } else if (rc != size) {
 319                 CWARN("%s: crashed lfsck_layout, to be reset: rc = %d\n",
 320                       lfsck_lfsck2name(com->lc_lfsck), rc);
 321                 return 1;
 322         }
 323
 324         lfsck_layout_le_to_cpu(lo, com->lc_file_disk);
 325         if (lo->ll_magic != LFSCK_LAYOUT_MAGIC) {
 326                 CWARN("%s: invalid lfsck_layout magic %#x != %#x, "
 327                       "to be reset\n", lfsck_lfsck2name(com->lc_lfsck),
 328                       lo->ll_magic, LFSCK_LAYOUT_MAGIC);
 329                 return 1;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static int lfsck_layout_store(const struct lu_env *env,
 336                               struct lfsck_component *com)
 337 {
 338         struct dt_object         *obj           = com->lc_obj;
 339         struct lfsck_instance    *lfsck         = com->lc_lfsck;
 340         struct lfsck_layout      *lo            = com->lc_file_disk;
 341         struct thandle           *handle;
 342         ssize_t                   size          = com->lc_file_size;
 343         loff_t                    pos           = 0;
 344         int                       rc;
 345         ENTRY;
 346
 347         lfsck_layout_cpu_to_le(lo, com->lc_file_ram);
 348         handle = dt_trans_create(env, lfsck->li_bottom);
 349         if (IS_ERR(handle)) {
 350                 rc = PTR_ERR(handle);
 351                 CERROR("%s: fail to create trans for storing lfsck_layout: "
 352                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 353                 RETURN(rc);
 354         }
 355
 356         rc = dt_declare_record_write(env, obj, size, pos, handle);
 357         if (rc != 0) {
 358                 CERROR("%s: fail to declare trans for storing lfsck_layout(1): "
 359                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 360                 GOTO(out, rc);
 361         }
 362
 363         rc = dt_trans_start_local(env, lfsck->li_bottom, handle);
 364         if (rc != 0) {
 365                 CERROR("%s: fail to start trans for storing lfsck_layout: "
 366                        "rc = %d\n", lfsck_lfsck2name(lfsck), rc);
 367                 GOTO(out, rc);
 368         }
 369
 370         rc = dt_record_write(env, obj, lfsck_buf_get(env, lo, size), &pos,
 371                              handle);
 372         if (rc != 0)
 373                 CERROR("%s: fail to store lfsck_layout(1): size = %d, "
 374                        "rc = %d\n", lfsck_lfsck2name(lfsck), (int)size, rc);
 375
 376         GOTO(out, rc);
 377
 378 out:
 379         dt_trans_stop(env, lfsck->li_bottom, handle);
 380
 381         return rc;
 382 }
 383
 384 static int lfsck_layout_init(const struct lu_env *env,
 385                              struct lfsck_component *com)
 386 {
 387         struct lfsck_layout *lo = com->lc_file_ram;
 388         int rc;
 389
 390         memset(lo, 0, com->lc_file_size);
 391         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
 392         lo->ll_status = LS_INIT;
 393         down_write(&com->lc_sem);
 394         rc = lfsck_layout_store(env, com);
 395         up_write(&com->lc_sem);
 396
 397         return rc;
 398 }
 399
 400 static int fid_is_for_ostobj(const struct lu_env *env, struct dt_device *dt,
 401                              struct dt_object *obj, const struct lu_fid *fid)
 402 {
 403         struct seq_server_site  *ss     = lu_site2seq(dt->dd_lu_dev.ld_site);
 404         struct lu_seq_range      range  = { 0 };
 405         struct lustre_mdt_attrs *lma;
 406         int                      rc;
 407
 408         fld_range_set_any(&range);
 409         rc = fld_server_lookup(env, ss->ss_server_fld, fid_seq(fid), &range);
 410         if (rc == 0) {
 411                 if (fld_range_is_ost(&range))
 412                         return 1;
 413
 414                 return 0;
 415         }
 416
 417         lma = &lfsck_env_info(env)->lti_lma;
 418         rc = dt_xattr_get(env, obj, lfsck_buf_get(env, lma, sizeof(*lma)),
 419                           XATTR_NAME_LMA, BYPASS_CAPA);
 420         if (rc == sizeof(*lma)) {
 421                 lustre_lma_swab(lma);
 422
 423                 /* Generally, the low layer OSD create handler or OI scrub
 424                  * will set the LMAC_FID_ON_OST for all external visible
 425                  * OST-objects. But to make the otable-based iteration to
 426                  * be independent from OI scrub in spite of it got failure
 427                  * or not, we check the LMAC_FID_ON_OST here to guarantee
 428                  * that the LFSCK will not repair something by wrong. */
 429                 return lma->lma_compat & LMAC_FID_ON_OST ? 1 : 0;
 430         }
 431
 432         rc = dt_xattr_get(env, obj, &LU_BUF_NULL, XATTR_NAME_FID, BYPASS_CAPA);
 433
 434         return rc > 0;
 435 }
 436
 437 static struct lfsck_layout_seq *
 438 lfsck_layout_seq_lookup(struct lfsck_layout_slave_data *llsd, __u64 seq)
 439 {
 440         struct lfsck_layout_seq *lls;
 441
 442         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
 443                 if (lls->lls_seq == seq)
 444                         return lls;
 445
 446                 if (lls->lls_seq > seq)
 447                         return NULL;
 448         }
 449
 450         return NULL;
 451 }
 452
 453 static void
 454 lfsck_layout_seq_insert(struct lfsck_layout_slave_data *llsd,
 455                         struct lfsck_layout_seq *lls)
 456 {
 457         struct lfsck_layout_seq *tmp;
 458         struct list_head        *pos = &llsd->llsd_seq_list;
 459
 460         list_for_each_entry(tmp, &llsd->llsd_seq_list, lls_list) {
 461                 if (lls->lls_seq < tmp->lls_seq) {
 462                         pos = &tmp->lls_list;
 463                         break;
 464                 }
 465         }
 466         list_add_tail(&lls->lls_list, pos);
 467 }
 468
 469 static int
 470 lfsck_layout_lastid_create(const struct lu_env *env,
 471                            struct lfsck_instance *lfsck,
 472                            struct dt_object *obj)
 473 {
 474         struct lfsck_thread_info *info   = lfsck_env_info(env);
 475         struct lu_attr           *la     = &info->lti_la;
 476         struct dt_object_format  *dof    = &info->lti_dof;
 477         struct lfsck_bookmark    *bk     = &lfsck->li_bookmark_ram;
 478         struct dt_device         *dt     = lfsck->li_bottom;
 479         struct thandle           *th;
 480         __u64                     lastid = 0;
 481         loff_t                    pos    = 0;
 482         int                       rc;
 483         ENTRY;
 484
 485         CDEBUG(D_LFSCK, "To create LAST_ID for <seq> "LPX64"\n",
 486                fid_seq(lfsck_dto2fid(obj)));
 487
 488         if (bk->lb_param & LPF_DRYRUN)
 489                 return 0;
 490
 491         memset(la, 0, sizeof(*la));
 492         la->la_mode = S_IFREG |  S_IRUGO | S_IWUSR;
 493         la->la_valid = LA_MODE | LA_UID | LA_GID;
 494         dof->dof_type = dt_mode_to_dft(S_IFREG);
 495
 496         th = dt_trans_create(env, dt);
 497         if (IS_ERR(th))
 498                 RETURN(rc = PTR_ERR(th));
 499
 500         rc = dt_declare_create(env, obj, la, NULL, dof, th);
 501         if (rc != 0)
 502                 GOTO(stop, rc);
 503
 504         rc = dt_declare_record_write(env, obj, sizeof(lastid), pos, th);
 505         if (rc != 0)
 506                 GOTO(stop, rc);
 507
 508         rc = dt_trans_start_local(env, dt, th);
 509         if (rc != 0)
 510                 GOTO(stop, rc);
 511
 512         dt_write_lock(env, obj, 0);
 513         if (likely(!dt_object_exists(obj))) {
 514                 rc = dt_create(env, obj, la, NULL, dof, th);
 515                 if (rc == 0)
 516                         rc = dt_record_write(env, obj,
 517                                 lfsck_buf_get(env, &lastid, sizeof(lastid)),
 518                                 &pos, th);
 519         }
 520         dt_write_unlock(env, obj);
 521
 522         GOTO(stop, rc);
 523
 524 stop:
 525         dt_trans_stop(env, dt, th);
 526
 527         return rc;
 528 }
 529
 530 static int
 531 lfsck_layout_lastid_reload(const struct lu_env *env,
 532                            struct lfsck_component *com,
 533                            struct lfsck_layout_seq *lls)
 534 {
 535         __u64   lastid;
 536         loff_t  pos     = 0;
 537         int     rc;
 538
 539         dt_read_lock(env, lls->lls_lastid_obj, 0);
 540         rc = dt_record_read(env, lls->lls_lastid_obj,
 541                             lfsck_buf_get(env, &lastid, sizeof(lastid)), &pos);
 542         dt_read_unlock(env, lls->lls_lastid_obj);
 543         if (unlikely(rc != 0))
 544                 return rc;
 545
 546         lastid = le64_to_cpu(lastid);
 547         if (lastid < lls->lls_lastid_known) {
 548                 struct lfsck_instance   *lfsck  = com->lc_lfsck;
 549                 struct lfsck_layout     *lo     = com->lc_file_ram;
 550
 551                 lls->lls_lastid = lls->lls_lastid_known;
 552                 lls->lls_dirty = 1;
 553                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
 554                         LASSERT(lfsck->li_out_notify != NULL);
 555
 556                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
 557                                              LE_LASTID_REBUILDING);
 558                         lo->ll_flags |= LF_CRASHED_LASTID;
 559                 }
 560         } else if (lastid >= lls->lls_lastid) {
 561                 lls->lls_lastid = lastid;
 562                 lls->lls_dirty = 0;
 563         }
 564
 565         return 0;
 566 }
 567
 568 static int
 569 lfsck_layout_lastid_store(const struct lu_env *env,
 570                           struct lfsck_component *com)
 571 {
 572         struct lfsck_instance           *lfsck  = com->lc_lfsck;
 573         struct lfsck_bookmark           *bk     = &lfsck->li_bookmark_ram;
 574         struct dt_device                *dt     = lfsck->li_bottom;
 575         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
 576         struct lfsck_layout_seq         *lls;
 577         struct thandle                  *th;
 578         __u64                            lastid;
 579         int                              rc     = 0;
 580         int                              rc1    = 0;
 581
 582         list_for_each_entry(lls, &llsd->llsd_seq_list, lls_list) {
 583                 loff_t pos = 0;
 584
 585                 /* XXX: Add the code back if we really found related
 586                  *      inconsistent cases in the future. */
 587 #if 0
 588                 if (!lls->lls_dirty) {
 589                         /* In OFD, before the pre-creation, the LAST_ID
 590                          * file will be updated firstly, which may hide
 591                          * some potential crashed cases. For example:
 592                          *
 593                          * The old obj1's ID is higher than old LAST_ID
 594                          * but lower than the new LAST_ID, but the LFSCK
 595                          * have not touch the obj1 until the OFD updated
 596                          * the LAST_ID. So the LFSCK does not regard it
 597                          * as crashed case. But when OFD does not create
 598                          * successfully, it will set the LAST_ID as the
 599                          * real created objects' ID, then LFSCK needs to
 600                          * found related inconsistency. */
 601                         rc = lfsck_layout_lastid_reload(env, com, lls);
 602                         if (likely(!lls->lls_dirty))
 603                                 continue;
 604                 }
 605 #endif
 606
 607                 CDEBUG(D_LFSCK, "To sync the LAST_ID for <seq> "LPX64
 608                        " as <oid> "LPU64"\n", lls->lls_seq, lls->lls_lastid);
 609
 610                 if (bk->lb_param & LPF_DRYRUN) {
 611                         lls->lls_dirty = 0;
 612                         continue;
 613                 }
 614
 615                 th = dt_trans_create(env, dt);
 616                 if (IS_ERR(th)) {
 617                         rc1 = PTR_ERR(th);
 618                         CERROR("%s: (1) failed to store "LPX64": rc = %d\n",
 619                                lfsck_lfsck2name(com->lc_lfsck),
 620                                lls->lls_seq, rc1);
 621                         continue;
 622                 }
 623
 624                 rc = dt_declare_record_write(env, lls->lls_lastid_obj,
 625                                              sizeof(lastid), pos, th);
 626                 if (rc != 0)
 627                         goto stop;
 628
 629                 rc = dt_trans_start_local(env, dt, th);
 630                 if (rc != 0)
 631                         goto stop;
 632
 633                 lastid = cpu_to_le64(lls->lls_lastid);
 634                 dt_write_lock(env, lls->lls_lastid_obj, 0);
 635                 rc = dt_record_write(env, lls->lls_lastid_obj,
 636                                      lfsck_buf_get(env, &lastid,
 637                                      sizeof(lastid)), &pos, th);
 638                 dt_write_unlock(env, lls->lls_lastid_obj);
 639                 if (rc == 0)
 640                         lls->lls_dirty = 0;
 641
 642 stop:
 643                 dt_trans_stop(env, dt, th);
 644                 if (rc != 0) {
 645                         rc1 = rc;
 646                         CERROR("%s: (2) failed to store "LPX64": rc = %d\n",
 647                                lfsck_lfsck2name(com->lc_lfsck),
 648                                lls->lls_seq, rc1);
 649                 }
 650         }
 651
 652         return rc1;
 653 }
 654
 655 static int
 656 lfsck_layout_lastid_load(const struct lu_env *env,
 657                          struct lfsck_component *com,
 658                          struct lfsck_layout_seq *lls)
 659 {
 660         struct lfsck_instance   *lfsck  = com->lc_lfsck;
 661         struct lfsck_layout     *lo     = com->lc_file_ram;
 662         struct lu_fid           *fid    = &lfsck_env_info(env)->lti_fid;
 663         struct dt_object        *obj;
 664         loff_t                   pos    = 0;
 665         int                      rc;
 666         ENTRY;
 667
 668         lu_last_id_fid(fid, lls->lls_seq, lfsck_dev_idx(lfsck->li_bottom));
 669         obj = dt_locate(env, lfsck->li_bottom, fid);
 670         if (IS_ERR(obj))
 671                 RETURN(PTR_ERR(obj));
 672
 673         /* LAST_ID crashed, to be rebuilt */
 674         if (!dt_object_exists(obj)) {
 675                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
 676                         LASSERT(lfsck->li_out_notify != NULL);
 677
 678                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
 679                                              LE_LASTID_REBUILDING);
 680                         lo->ll_flags |= LF_CRASHED_LASTID;
 681
 682                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_DELAY4) &&
 683                             cfs_fail_val > 0) {
 684                                 struct l_wait_info lwi = LWI_TIMEOUT(
 685                                                 cfs_time_seconds(cfs_fail_val),
 686                                                 NULL, NULL);
 687
 688                                 up_write(&com->lc_sem);
 689                                 l_wait_event(lfsck->li_thread.t_ctl_waitq,
 690                                              !thread_is_running(&lfsck->li_thread),
 691                                              &lwi);
 692                                 down_write(&com->lc_sem);
 693                         }
 694                 }
 695
 696                 rc = lfsck_layout_lastid_create(env, lfsck, obj);
 697         } else {
 698                 dt_read_lock(env, obj, 0);
 699                 rc = dt_read(env, obj,
 700                         lfsck_buf_get(env, &lls->lls_lastid, sizeof(__u64)),
 701                         &pos);
 702                 dt_read_unlock(env, obj);
 703                 if (rc != 0 && rc != sizeof(__u64))
 704                         GOTO(out, rc = (rc > 0 ? -EFAULT : rc));
 705
 706                 if (rc == 0 && !(lo->ll_flags & LF_CRASHED_LASTID)) {
 707                         LASSERT(lfsck->li_out_notify != NULL);
 708
 709                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
 710                                              LE_LASTID_REBUILDING);
 711                         lo->ll_flags |= LF_CRASHED_LASTID;
 712                 }
 713
 714                 lls->lls_lastid = le64_to_cpu(lls->lls_lastid);
 715                 rc = 0;
 716         }
 717
 718         GOTO(out, rc);
 719
 720 out:
 721         if (rc != 0)
 722                 lfsck_object_put(env, obj);
 723         else
 724                 lls->lls_lastid_obj = obj;
 725
 726         return rc;
 727 }
 728
 729 static int lfsck_layout_master_async_interpret(const struct lu_env *env,
 730                                                struct ptlrpc_request *req,
 731                                                void *args, int rc)
 732 {
 733         struct lfsck_async_interpret_args *laia = args;
 734         struct lfsck_component            *com  = laia->laia_com;
 735         struct lfsck_layout_master_data   *llmd = com->lc_data;
 736         struct lfsck_tgt_descs            *ltds = laia->laia_ltds;
 737         struct lfsck_tgt_desc             *ltd  = laia->laia_ltd;
 738         struct lfsck_request              *lr   = laia->laia_lr;
 739
 740         switch (lr->lr_event) {
 741         case LE_START:
 742                 if (rc == 0) {
 743                         spin_lock(&ltds->ltd_lock);
 744                         if (!ltd->ltd_dead && !ltd->ltd_layout_done) {
 745                                 if (list_empty(&ltd->ltd_layout_list))
 746                                         list_add_tail(
 747                                                 &ltd->ltd_layout_list,
 748                                                 &llmd->llmd_ost_list);
 749                                 if (list_empty(&ltd->ltd_layout_phase_list))
 750                                         list_add_tail(
 751                                                 &ltd->ltd_layout_phase_list,
 752                                                 &llmd->llmd_ost_phase1_list);
 753                         }
 754                         spin_unlock(&ltds->ltd_lock);
 755                 } else {
 756                         struct lfsck_layout *lo = com->lc_file_ram;
 757
 758                         lo->ll_flags |= LF_INCOMPLETE;
 759                 }
 760                 lfsck_tgt_put(ltd);
 761                 break;
 762         case LE_STOP:
 763         case LE_PHASE2_DONE:
 764                 break;
 765         case LE_QUERY:
 766                 spin_lock(&ltds->ltd_lock);
 767                 if (rc == 0 && !ltd->ltd_dead && !ltd->ltd_layout_done) {
 768                         struct lfsck_reply *reply;
 769
 770                         reply = req_capsule_server_get(&req->rq_pill,
 771                                                        &RMF_LFSCK_REPLY);
 772                         switch (reply->lr_status) {
 773                         case LS_SCANNING_PHASE1:
 774                                 break;
 775                         case LS_SCANNING_PHASE2:
 776                                 list_del(&ltd->ltd_layout_phase_list);
 777                                 list_add_tail(&ltd->ltd_layout_phase_list,
 778                                               &llmd->llmd_ost_phase2_list);
 779                                 break;
 780                         default:
 781                                 list_del_init(&ltd->ltd_layout_phase_list);
 782                                 list_del_init(&ltd->ltd_layout_list);
 783                                 break;
 784                         }
 785                 }
 786                 spin_unlock(&ltds->ltd_lock);
 787                 lfsck_tgt_put(ltd);
 788                 break;
 789         default:
 790                 CERROR("%s: unexpected event: rc = %d\n",
 791                        lfsck_lfsck2name(com->lc_lfsck), lr->lr_event);
 792                 break;
 793         }
 794
 795         return 0;
 796 }
 797
 798 static int lfsck_layout_master_query_others(const struct lu_env *env,
 799                                             struct lfsck_component *com)
 800 {
 801         struct lfsck_thread_info          *info  = lfsck_env_info(env);
 802         struct lfsck_request              *lr    = &info->lti_lr;
 803         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
 804         struct lfsck_instance             *lfsck = com->lc_lfsck;
 805         struct lfsck_layout_master_data   *llmd  = com->lc_data;
 806         struct ptlrpc_request_set         *set;
 807         struct lfsck_tgt_descs            *ltds;
 808         struct lfsck_tgt_desc             *ltd;
 809         __u32                              cnt   = 0;
 810         int                                rc    = 0;
 811         int                                rc1   = 0;
 812         ENTRY;
 813
 814         set = ptlrpc_prep_set();
 815         if (set == NULL)
 816                 RETURN(-ENOMEM);
 817
 818         llmd->llmd_touch_gen++;
 819         ltds = &lfsck->li_ost_descs;
 820         memset(lr, 0, sizeof(*lr));
 821         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
 822         lr->lr_event = LE_QUERY;
 823         lr->lr_active = LT_LAYOUT;
 824
 825         laia->laia_com = com;
 826         laia->laia_ltds = ltds;
 827         laia->laia_lr = lr;
 828         spin_lock(&ltds->ltd_lock);
 829         while (!list_empty(&llmd->llmd_ost_phase1_list)) {
 830                 ltd = list_entry(llmd->llmd_ost_phase1_list.next,
 831                                  struct lfsck_tgt_desc,
 832                                  ltd_layout_phase_list);
 833                 if (ltd->ltd_layout_gen == llmd->llmd_touch_gen)
 834                         break;
 835
 836                 ltd->ltd_layout_gen = llmd->llmd_touch_gen;
 837                 list_del(&ltd->ltd_layout_phase_list);
 838                 list_add_tail(&ltd->ltd_layout_phase_list,
 839                               &llmd->llmd_ost_phase1_list);
 840                 atomic_inc(&ltd->ltd_ref);
 841                 laia->laia_ltd = ltd;
 842                 spin_unlock(&ltds->ltd_lock);
 843                 rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
 844                                          lfsck_layout_master_async_interpret,
 845                                          laia, LFSCK_QUERY);
 846                 if (rc != 0) {
 847                         CERROR("%s: fail to query OST %x for layout: rc = %d\n",
 848                                lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
 849                         lfsck_tgt_put(ltd);
 850                         rc1 = rc;
 851                 } else {
 852                         cnt++;
 853                 }
 854                 spin_lock(&ltds->ltd_lock);
 855         }
 856         spin_unlock(&ltds->ltd_lock);
 857
 858         if (cnt > 0)
 859                 rc = ptlrpc_set_wait(set);
 860         ptlrpc_set_destroy(set);
 861
 862         RETURN(rc1 != 0 ? rc1 : rc);
 863 }
 864
 865 static inline bool
 866 lfsck_layout_master_to_orphan(struct lfsck_layout_master_data *llmd)
 867 {
 868         return !list_empty(&llmd->llmd_ost_phase2_list) ||
 869                list_empty(&llmd->llmd_ost_phase1_list);
 870 }
 871
 872 static int lfsck_layout_master_notify_others(const struct lu_env *env,
 873                                              struct lfsck_component *com,
 874                                              struct lfsck_request *lr)
 875 {
 876         struct lfsck_thread_info          *info  = lfsck_env_info(env);
 877         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
 878         struct lfsck_instance             *lfsck = com->lc_lfsck;
 879         struct lfsck_layout_master_data   *llmd  = com->lc_data;
 880         struct lfsck_layout               *lo    = com->lc_file_ram;
 881         struct ptlrpc_request_set         *set;
 882         struct lfsck_tgt_descs            *ltds;
 883         struct lfsck_tgt_desc             *ltd;
 884         __u32                              idx;
 885         __u32                              cnt   = 0;
 886         int                                rc    = 0;
 887         ENTRY;
 888
 889         set = ptlrpc_prep_set();
 890         if (set == NULL)
 891                 RETURN(-ENOMEM);
 892
 893         lr->lr_active = LT_LAYOUT;
 894         laia->laia_com = com;
 895         laia->laia_lr = lr;
 896         switch (lr->lr_event) {
 897         case LE_START:
 898                 ltds = &lfsck->li_ost_descs;
 899                 laia->laia_ltds = ltds;
 900                 down_read(&ltds->ltd_rw_sem);
 901                 cfs_foreach_bit(ltds->ltd_tgts_bitmap, idx) {
 902                         ltd = lfsck_tgt_get(ltds, idx);
 903                         LASSERT(ltd != NULL);
 904
 905                         laia->laia_ltd = ltd;
 906                         ltd->ltd_layout_done = 0;
 907                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
 908                                         lfsck_layout_master_async_interpret,
 909                                         laia, LFSCK_NOTIFY);
 910                         if (rc != 0) {
 911                                 CERROR("%s: fail to notify OST %x for layout "
 912                                        "start: rc = %d\n",
 913                                        lfsck_lfsck2name(lfsck), idx, rc);
 914                                 lfsck_tgt_put(ltd);
 915                                 lo->ll_flags |= LF_INCOMPLETE;
 916                         } else {
 917                                 cnt++;
 918                         }
 919                 }
 920                 up_read(&ltds->ltd_rw_sem);
 921                 break;
 922         case LE_STOP:
 923         case LE_PHASE2_DONE:
 924                 ltds = &lfsck->li_ost_descs;
 925                 laia->laia_ltds = ltds;
 926                 spin_lock(&ltds->ltd_lock);
 927                 while (!list_empty(&llmd->llmd_ost_list)) {
 928                         ltd = list_entry(llmd->llmd_ost_list.next,
 929                                          struct lfsck_tgt_desc,
 930                                          ltd_layout_list);
 931                         list_del_init(&ltd->ltd_layout_phase_list);
 932                         list_del_init(&ltd->ltd_layout_list);
 933                         laia->laia_ltd = ltd;
 934                         spin_unlock(&ltds->ltd_lock);
 935                         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
 936                                         lfsck_layout_master_async_interpret,
 937                                         laia, LFSCK_NOTIFY);
 938                         if (rc != 0)
 939                                 CERROR("%s: fail to notify OST %x for layout "
 940                                        "stop/done: rc = %d\n",
 941                                        lfsck_lfsck2name(lfsck),
 942                                        ltd->ltd_index, rc);
 943                         else
 944                                 cnt++;
 945                         spin_lock(&ltds->ltd_lock);
 946                 }
 947                 spin_unlock(&ltds->ltd_lock);
 948                 break;
 949         case LE_PHASE1_DONE:
 950                 break;
 951         default:
 952                 CERROR("%s: unexpected LFSCK event: rc = %d\n",
 953                        lfsck_lfsck2name(lfsck), lr->lr_event);
 954                 rc = -EINVAL;
 955                 break;
 956         }
 957
 958         if (cnt > 0)
 959                 rc = ptlrpc_set_wait(set);
 960         ptlrpc_set_destroy(set);
 961
 962         if (rc == 0 && lr->lr_event == LE_START &&
 963             list_empty(&llmd->llmd_ost_list))
 964                 rc = -ENODEV;
 965
 966         RETURN(rc);
 967 }
 968
 969 static int lfsck_layout_double_scan_result(const struct lu_env *env,
 970                                            struct lfsck_component *com,
 971                                            int rc)
 972 {
 973         struct lfsck_instance   *lfsck = com->lc_lfsck;
 974         struct lfsck_layout     *lo    = com->lc_file_ram;
 975         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
 976
 977         down_write(&com->lc_sem);
 978
 979         lo->ll_run_time_phase2 += cfs_duration_sec(cfs_time_current() +
 980                                 HALF_SEC - lfsck->li_time_last_checkpoint);
 981         lo->ll_time_last_checkpoint = cfs_time_current_sec();
 982         lo->ll_objs_checked_phase2 += com->lc_new_checked;
 983
 984         if (rc > 0) {
 985                 com->lc_journal = 0;
 986                 if (lo->ll_flags & LF_INCOMPLETE)
 987                         lo->ll_status = LS_PARTIAL;
 988                 else
 989                         lo->ll_status = LS_COMPLETED;
 990                 if (!(bk->lb_param & LPF_DRYRUN))
 991                         lo->ll_flags &= ~(LF_SCANNED_ONCE | LF_INCONSISTENT);
 992                 lo->ll_time_last_complete = lo->ll_time_last_checkpoint;
 993                 lo->ll_success_count++;
 994         } else if (rc == 0) {
 995                 lo->ll_status = lfsck->li_status;
 996                 if (lo->ll_status == 0)
 997                         lo->ll_status = LS_STOPPED;
 998         } else {
 999                 lo->ll_status = LS_FAILED;
1000         }
1001
1002         if (lo->ll_status != LS_PAUSED) {
1003                 spin_lock(&lfsck->li_lock);
1004                 list_del_init(&com->lc_link);
1005                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1006                 spin_unlock(&lfsck->li_lock);
1007         }
1008
1009         rc = lfsck_layout_store(env, com);
1010
1011         up_write(&com->lc_sem);
1012
1013         return rc;
1014 }
1015
1016 static int lfsck_layout_scan_orphan(const struct lu_env *env,
1017                                     struct lfsck_component *com,
1018                                     struct lfsck_tgt_desc *ltd)
1019 {
1020         /* XXX: To be extended in other patch. */
1021
1022         return 0;
1023 }
1024
1025 static int lfsck_layout_assistant(void *args)
1026 {
1027         struct lfsck_thread_args        *lta     = args;
1028         struct lu_env                   *env     = &lta->lta_env;
1029         struct lfsck_component          *com     = lta->lta_com;
1030         struct lfsck_instance           *lfsck   = lta->lta_lfsck;
1031         struct lfsck_bookmark           *bk      = &lfsck->li_bookmark_ram;
1032         struct lfsck_position           *pos     = &com->lc_pos_start;
1033         struct lfsck_thread_info        *info    = lfsck_env_info(env);
1034         struct lfsck_request            *lr      = &info->lti_lr;
1035         struct lfsck_layout_master_data *llmd    = com->lc_data;
1036         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
1037         struct ptlrpc_thread            *athread = &llmd->llmd_thread;
1038         struct lfsck_layout_req         *llr;
1039         struct l_wait_info               lwi     = { 0 };
1040         int                              rc      = 0;
1041         int                              rc1     = 0;
1042         ENTRY;
1043
1044         memset(lr, 0, sizeof(*lr));
1045         lr->lr_event = LE_START;
1046         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1047         lr->lr_valid = LSV_SPEED_LIMIT | LSV_ERROR_HANDLE | LSV_DRYRUN |
1048                        LSV_ASYNC_WINDOWS;
1049         lr->lr_speed = bk->lb_speed_limit;
1050         lr->lr_version = bk->lb_version;
1051         lr->lr_param = bk->lb_param;
1052         lr->lr_async_windows = bk->lb_async_windows;
1053         if (pos->lp_oit_cookie <= 1)
1054                 lr->lr_param |= LPF_RESET;
1055
1056         rc = lfsck_layout_master_notify_others(env, com, lr);
1057         if (rc != 0) {
1058                 CERROR("%s: fail to notify others for layout start: rc = %d\n",
1059                        lfsck_lfsck2name(lfsck), rc);
1060                 GOTO(fini, rc);
1061         }
1062
1063         spin_lock(&llmd->llmd_lock);
1064         thread_set_flags(athread, SVC_RUNNING);
1065         spin_unlock(&llmd->llmd_lock);
1066         wake_up_all(&mthread->t_ctl_waitq);
1067
1068         while (1) {
1069                 while (!list_empty(&llmd->llmd_req_list)) {
1070                         bool wakeup = false;
1071
1072                         l_wait_event(athread->t_ctl_waitq,
1073                                      bk->lb_async_windows == 0 ||
1074                                      atomic_read(&llmd->llmd_rpcs_in_flight) <
1075                                                 bk->lb_async_windows ||
1076                                      llmd->llmd_exit,
1077                                      &lwi);
1078
1079                         if (unlikely(llmd->llmd_exit))
1080                                 GOTO(cleanup1, rc = llmd->llmd_post_result);
1081
1082                         /* XXX: To be extended in other patch.
1083                          *
1084                          * Compare the OST side attribute with local attribute,
1085                          * and fix it if found inconsistency. */
1086
1087                         spin_lock(&llmd->llmd_lock);
1088                         llr = list_entry(llmd->llmd_req_list.next,
1089                                          struct lfsck_layout_req,
1090                                          llr_list);
1091                         list_del_init(&llr->llr_list);
1092                         if (bk->lb_async_windows != 0 &&
1093                             llmd->llmd_prefetched >= bk->lb_async_windows)
1094                                 wakeup = true;
1095
1096                         llmd->llmd_prefetched--;
1097                         spin_unlock(&llmd->llmd_lock);
1098                         if (wakeup)
1099                                 wake_up_all(&mthread->t_ctl_waitq);
1100
1101                         lfsck_layout_req_fini(env, llr);
1102                 }
1103
1104                 /* Wakeup the master engine if it is waiting in checkpoint. */
1105                 if (atomic_read(&llmd->llmd_rpcs_in_flight) == 0)
1106                         wake_up_all(&mthread->t_ctl_waitq);
1107
1108                 l_wait_event(athread->t_ctl_waitq,
1109                              !lfsck_layout_req_empty(llmd) ||
1110                              llmd->llmd_exit ||
1111                              llmd->llmd_to_post ||
1112                              llmd->llmd_to_double_scan,
1113                              &lwi);
1114
1115                 if (unlikely(llmd->llmd_exit))
1116                         GOTO(cleanup1, rc = llmd->llmd_post_result);
1117
1118                 if (!list_empty(&llmd->llmd_req_list))
1119                         continue;
1120
1121                 if (llmd->llmd_to_post) {
1122                         llmd->llmd_to_post = 0;
1123                         LASSERT(llmd->llmd_post_result > 0);
1124
1125                         memset(lr, 0, sizeof(*lr));
1126                         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1127                         lr->lr_event = LE_PHASE1_DONE;
1128                         lr->lr_status = llmd->llmd_post_result;
1129                         rc = lfsck_layout_master_notify_others(env, com, lr);
1130                         if (rc != 0)
1131                                 CERROR("%s: failed to notify others "
1132                                        "for layout post: rc = %d\n",
1133                                        lfsck_lfsck2name(lfsck), rc);
1134
1135                         /* Wakeup the master engine to go ahead. */
1136                         wake_up_all(&mthread->t_ctl_waitq);
1137                 }
1138
1139                 if (llmd->llmd_to_double_scan) {
1140                         llmd->llmd_to_double_scan = 0;
1141                         atomic_inc(&lfsck->li_double_scan_count);
1142                         llmd->llmd_in_double_scan = 1;
1143                         wake_up_all(&mthread->t_ctl_waitq);
1144
1145                         while (llmd->llmd_in_double_scan) {
1146                                 struct lfsck_tgt_descs  *ltds =
1147                                                         &lfsck->li_ost_descs;
1148                                 struct lfsck_tgt_desc   *ltd;
1149
1150                                 rc = lfsck_layout_master_query_others(env, com);
1151                                 if (lfsck_layout_master_to_orphan(llmd))
1152                                         goto orphan;
1153
1154                                 if (rc < 0)
1155                                         GOTO(cleanup2, rc);
1156
1157                                 /* Pull LFSCK status on related targets once
1158                                  * per 30 seconds if we are not notified. */
1159                                 lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(30),
1160                                                            cfs_time_seconds(1),
1161                                                            NULL, NULL);
1162                                 rc = l_wait_event(athread->t_ctl_waitq,
1163                                         lfsck_layout_master_to_orphan(llmd) ||
1164                                         llmd->llmd_exit ||
1165                                         !thread_is_running(mthread),
1166                                         &lwi);
1167
1168                                 if (unlikely(llmd->llmd_exit ||
1169                                              !thread_is_running(mthread)))
1170                                         GOTO(cleanup2, rc = 0);
1171
1172                                 if (rc == -ETIMEDOUT)
1173                                         continue;
1174
1175                                 if (rc < 0)
1176                                         GOTO(cleanup2, rc);
1177
1178 orphan:
1179                                 spin_lock(&ltds->ltd_lock);
1180                                 while (!list_empty(
1181                                                 &llmd->llmd_ost_phase2_list)) {
1182                                         ltd = list_entry(
1183                                               llmd->llmd_ost_phase2_list.next,
1184                                               struct lfsck_tgt_desc,
1185                                               ltd_layout_phase_list);
1186                                         list_del_init(
1187                                                 &ltd->ltd_layout_phase_list);
1188                                         spin_unlock(&ltds->ltd_lock);
1189
1190                                         rc = lfsck_layout_scan_orphan(env, com,
1191                                                                       ltd);
1192                                         if (rc != 0 &&
1193                                             bk->lb_param & LPF_FAILOUT)
1194                                                 GOTO(cleanup2, rc);
1195
1196                                         if (unlikely(llmd->llmd_exit ||
1197                                                 !thread_is_running(mthread)))
1198                                                 GOTO(cleanup2, rc = 0);
1199
1200                                         spin_lock(&ltds->ltd_lock);
1201                                 }
1202
1203                                 if (list_empty(&llmd->llmd_ost_phase1_list)) {
1204                                         spin_unlock(&ltds->ltd_lock);
1205                                         GOTO(cleanup2, rc = 1);
1206                                 }
1207                                 spin_unlock(&ltds->ltd_lock);
1208                         }
1209                 }
1210         }
1211
1212 cleanup1:
1213         /* Cleanup the unfinished requests. */
1214         spin_lock(&llmd->llmd_lock);
1215         while (!list_empty(&llmd->llmd_req_list)) {
1216                 llr = list_entry(llmd->llmd_req_list.next,
1217                                  struct lfsck_layout_req,
1218                                  llr_list);
1219                 list_del_init(&llr->llr_list);
1220                 llmd->llmd_prefetched--;
1221                 spin_unlock(&llmd->llmd_lock);
1222                 lfsck_layout_req_fini(env, llr);
1223                 spin_lock(&llmd->llmd_lock);
1224         }
1225         spin_unlock(&llmd->llmd_lock);
1226
1227         LASSERTF(llmd->llmd_prefetched == 0, "unmatched prefeteched objs %d\n",
1228                  llmd->llmd_prefetched);
1229
1230         l_wait_event(athread->t_ctl_waitq,
1231                      atomic_read(&llmd->llmd_rpcs_in_flight) == 0,
1232                      &lwi);
1233
1234 cleanup2:
1235         memset(lr, 0, sizeof(*lr));
1236         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1237         if (rc > 0) {
1238                 lr->lr_event = LE_PHASE2_DONE;
1239                 lr->lr_status = rc;
1240         } else if (rc == 0) {
1241                 lr->lr_event = LE_STOP;
1242                 if (lfsck->li_status == LS_PAUSED ||
1243                     lfsck->li_status == LS_CO_PAUSED)
1244                         lr->lr_status = LS_CO_PAUSED;
1245                 else if (lfsck->li_status == LS_STOPPED ||
1246                          lfsck->li_status == LS_CO_STOPPED)
1247                         lr->lr_status = LS_CO_STOPPED;
1248                 else
1249                         LBUG();
1250         } else {
1251                 lr->lr_event = LE_STOP;
1252                 lr->lr_status = LS_CO_FAILED;
1253         }
1254
1255         rc1 = lfsck_layout_master_notify_others(env, com, lr);
1256         if (rc1 != 0) {
1257                 CERROR("%s: failed to notify others for layout quit: rc = %d\n",
1258                        lfsck_lfsck2name(lfsck), rc1);
1259                 rc = rc1;
1260         }
1261
1262         /* Under force exit case, some requests may be just freed without
1263          * verification, those objects should be re-handled when next run.
1264          * So not update the on-disk tracing file under such case. */
1265         if (!llmd->llmd_exit)
1266                 rc1 = lfsck_layout_double_scan_result(env, com, rc);
1267
1268 fini:
1269         if (llmd->llmd_in_double_scan)
1270                 atomic_dec(&lfsck->li_double_scan_count);
1271
1272         spin_lock(&llmd->llmd_lock);
1273         llmd->llmd_assistant_status = (rc1 != 0 ? rc1 : rc);
1274         thread_set_flags(athread, SVC_STOPPED);
1275         wake_up_all(&mthread->t_ctl_waitq);
1276         spin_unlock(&llmd->llmd_lock);
1277         lfsck_thread_args_fini(lta);
1278
1279         return rc;
1280 }
1281
1282 static int
1283 lfsck_layout_slave_async_interpret(const struct lu_env *env,
1284                                    struct ptlrpc_request *req,
1285                                    void *args, int rc)
1286 {
1287         struct lfsck_layout_slave_async_args *llsaa = args;
1288         struct obd_export                    *exp   = llsaa->llsaa_exp;
1289         struct lfsck_component               *com   = llsaa->llsaa_com;
1290         struct lfsck_layout_slave_target     *llst  = llsaa->llsaa_llst;
1291         struct lfsck_layout_slave_data       *llsd  = com->lc_data;
1292         bool                                  done  = false;
1293
1294         if (rc != 0) {
1295                 /* It is quite probably caused by target crash,
1296                  * to make the LFSCK can go ahead, assume that
1297                  * the target finished the LFSCK prcoessing. */
1298                 done = true;
1299         } else {
1300                 struct lfsck_reply *lr;
1301
1302                 lr = req_capsule_server_get(&req->rq_pill, &RMF_LFSCK_REPLY);
1303                 if (lr->lr_status != LS_SCANNING_PHASE1 &&
1304                     lr->lr_status != LS_SCANNING_PHASE2)
1305                         done = true;
1306         }
1307         if (done)
1308                 lfsck_layout_llst_del(llsd, llst);
1309         lfsck_layout_llst_put(llst);
1310         lfsck_component_put(env, com);
1311         class_export_put(exp);
1312
1313         return 0;
1314 }
1315
1316 static int lfsck_layout_async_query(const struct lu_env *env,
1317                                     struct lfsck_component *com,
1318                                     struct obd_export *exp,
1319                                     struct lfsck_layout_slave_target *llst,
1320                                     struct lfsck_request *lr,
1321                                     struct ptlrpc_request_set *set)
1322 {
1323         struct lfsck_layout_slave_async_args *llsaa;
1324         struct ptlrpc_request                *req;
1325         struct lfsck_request                 *tmp;
1326         int                                   rc;
1327         ENTRY;
1328
1329         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_QUERY);
1330         if (req == NULL)
1331                 RETURN(-ENOMEM);
1332
1333         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_QUERY);
1334         if (rc != 0) {
1335                 ptlrpc_request_free(req);
1336                 RETURN(rc);
1337         }
1338
1339         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1340         *tmp = *lr;
1341         ptlrpc_request_set_replen(req);
1342
1343         llsaa = ptlrpc_req_async_args(req);
1344         llsaa->llsaa_exp = exp;
1345         llsaa->llsaa_com = lfsck_component_get(com);
1346         llsaa->llsaa_llst = llst;
1347         req->rq_interpret_reply = lfsck_layout_slave_async_interpret;
1348         ptlrpc_set_add_req(set, req);
1349
1350         RETURN(0);
1351 }
1352
1353 static int lfsck_layout_async_notify(const struct lu_env *env,
1354                                      struct obd_export *exp,
1355                                      struct lfsck_request *lr,
1356                                      struct ptlrpc_request_set *set)
1357 {
1358         struct ptlrpc_request   *req;
1359         struct lfsck_request    *tmp;
1360         int                      rc;
1361         ENTRY;
1362
1363         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LFSCK_NOTIFY);
1364         if (req == NULL)
1365                 RETURN(-ENOMEM);
1366
1367         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, LFSCK_NOTIFY);
1368         if (rc != 0) {
1369                 ptlrpc_request_free(req);
1370                 RETURN(rc);
1371         }
1372
1373         tmp = req_capsule_client_get(&req->rq_pill, &RMF_LFSCK_REQUEST);
1374         *tmp = *lr;
1375         ptlrpc_request_set_replen(req);
1376         ptlrpc_set_add_req(set, req);
1377
1378         RETURN(0);
1379 }
1380
1381 static int
1382 lfsck_layout_slave_query_master(const struct lu_env *env,
1383                                 struct lfsck_component *com)
1384 {
1385         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
1386         struct lfsck_instance            *lfsck = com->lc_lfsck;
1387         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
1388         struct lfsck_layout_slave_target *llst;
1389         struct obd_export                *exp;
1390         struct ptlrpc_request_set        *set;
1391         int                               cnt   = 0;
1392         int                               rc    = 0;
1393         int                               rc1   = 0;
1394         ENTRY;
1395
1396         set = ptlrpc_prep_set();
1397         if (set == NULL)
1398                 RETURN(-ENOMEM);
1399
1400         memset(lr, 0, sizeof(*lr));
1401         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1402         lr->lr_event = LE_QUERY;
1403         lr->lr_active = LT_LAYOUT;
1404
1405         llsd->llsd_touch_gen++;
1406         spin_lock(&llsd->llsd_lock);
1407         while (!list_empty(&llsd->llsd_master_list)) {
1408                 llst = list_entry(llsd->llsd_master_list.next,
1409                                   struct lfsck_layout_slave_target,
1410                                   llst_list);
1411                 if (llst->llst_gen == llsd->llsd_touch_gen)
1412                         break;
1413
1414                 llst->llst_gen = llsd->llsd_touch_gen;
1415                 list_del(&llst->llst_list);
1416                 list_add_tail(&llst->llst_list,
1417                               &llsd->llsd_master_list);
1418                 atomic_inc(&llst->llst_ref);
1419                 spin_unlock(&llsd->llsd_lock);
1420
1421                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
1422                                                llst->llst_index);
1423                 if (exp == NULL) {
1424                         lfsck_layout_llst_del(llsd, llst);
1425                         lfsck_layout_llst_put(llst);
1426                         spin_lock(&llsd->llsd_lock);
1427                         continue;
1428                 }
1429
1430                 rc = lfsck_layout_async_query(env, com, exp, llst, lr, set);
1431                 if (rc != 0) {
1432                         CERROR("%s: slave fail to query %s for layout: "
1433                                "rc = %d\n", lfsck_lfsck2name(lfsck),
1434                                exp->exp_obd->obd_name, rc);
1435                         rc1 = rc;
1436                         lfsck_layout_llst_put(llst);
1437                         class_export_put(exp);
1438                 } else {
1439                         cnt++;
1440                 }
1441                 spin_lock(&llsd->llsd_lock);
1442         }
1443         spin_unlock(&llsd->llsd_lock);
1444
1445         if (cnt > 0)
1446                 rc = ptlrpc_set_wait(set);
1447         ptlrpc_set_destroy(set);
1448
1449         RETURN(rc1 != 0 ? rc1 : rc);
1450 }
1451
1452 static void
1453 lfsck_layout_slave_notify_master(const struct lu_env *env,
1454                                  struct lfsck_component *com,
1455                                  enum lfsck_events event, int result)
1456 {
1457         struct lfsck_instance            *lfsck = com->lc_lfsck;
1458         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
1459         struct lfsck_request             *lr    = &lfsck_env_info(env)->lti_lr;
1460         struct lfsck_layout_slave_target *llst;
1461         struct obd_export                *exp;
1462         struct ptlrpc_request_set        *set;
1463         int                               cnt   = 0;
1464         int                               rc;
1465         ENTRY;
1466
1467         set = ptlrpc_prep_set();
1468         if (set == NULL)
1469                 RETURN_EXIT;
1470
1471         memset(lr, 0, sizeof(*lr));
1472         lr->lr_event = event;
1473         lr->lr_status = result;
1474         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
1475         lr->lr_active = LT_LAYOUT;
1476         llsd->llsd_touch_gen++;
1477         spin_lock(&llsd->llsd_lock);
1478         while (!list_empty(&llsd->llsd_master_list)) {
1479                 llst = list_entry(llsd->llsd_master_list.next,
1480                                   struct lfsck_layout_slave_target,
1481                                   llst_list);
1482                 if (llst->llst_gen == llsd->llsd_touch_gen)
1483                         break;
1484
1485                 llst->llst_gen = llsd->llsd_touch_gen;
1486                 list_del(&llst->llst_list);
1487                 list_add_tail(&llst->llst_list,
1488                               &llsd->llsd_master_list);
1489                 atomic_inc(&llst->llst_ref);
1490                 spin_unlock(&llsd->llsd_lock);
1491
1492                 exp = lustre_find_lwp_by_index(lfsck->li_obd->obd_name,
1493                                                llst->llst_index);
1494                 if (exp == NULL) {
1495                         lfsck_layout_llst_del(llsd, llst);
1496                         lfsck_layout_llst_put(llst);
1497                         spin_lock(&llsd->llsd_lock);
1498                         continue;
1499                 }
1500
1501                 rc = lfsck_layout_async_notify(env, exp, lr, set);
1502                 if (rc != 0)
1503                         CERROR("%s: slave fail to notify %s for layout: "
1504                                "rc = %d\n", lfsck_lfsck2name(lfsck),
1505                                exp->exp_obd->obd_name, rc);
1506                 else
1507                         cnt++;
1508                 lfsck_layout_llst_put(llst);
1509                 class_export_put(exp);
1510                 spin_lock(&llsd->llsd_lock);
1511         }
1512         spin_unlock(&llsd->llsd_lock);
1513
1514         if (cnt > 0)
1515                 rc = ptlrpc_set_wait(set);
1516
1517         ptlrpc_set_destroy(set);
1518
1519         RETURN_EXIT;
1520 }
1521
1522 /* layout APIs */
1523
1524 static int lfsck_layout_reset(const struct lu_env *env,
1525                               struct lfsck_component *com, bool init)
1526 {
1527         struct lfsck_layout     *lo    = com->lc_file_ram;
1528         int                      rc;
1529
1530         down_write(&com->lc_sem);
1531         if (init) {
1532                 memset(lo, 0, com->lc_file_size);
1533         } else {
1534                 __u32 count = lo->ll_success_count;
1535                 __u64 last_time = lo->ll_time_last_complete;
1536
1537                 memset(lo, 0, com->lc_file_size);
1538                 lo->ll_success_count = count;
1539                 lo->ll_time_last_complete = last_time;
1540         }
1541
1542         lo->ll_magic = LFSCK_LAYOUT_MAGIC;
1543         lo->ll_status = LS_INIT;
1544
1545         rc = lfsck_layout_store(env, com);
1546         up_write(&com->lc_sem);
1547
1548         return rc;
1549 }
1550
1551 static void lfsck_layout_fail(const struct lu_env *env,
1552                               struct lfsck_component *com, bool new_checked)
1553 {
1554         struct lfsck_layout *lo = com->lc_file_ram;
1555
1556         down_write(&com->lc_sem);
1557         if (new_checked)
1558                 com->lc_new_checked++;
1559         lo->ll_objs_failed_phase1++;
1560         if (lo->ll_pos_first_inconsistent == 0) {
1561                 struct lfsck_instance *lfsck = com->lc_lfsck;
1562
1563                 lo->ll_pos_first_inconsistent =
1564                         lfsck->li_obj_oit->do_index_ops->dio_it.store(env,
1565                                                         lfsck->li_di_oit);
1566         }
1567         up_write(&com->lc_sem);
1568 }
1569
1570 static int lfsck_layout_master_checkpoint(const struct lu_env *env,
1571                                           struct lfsck_component *com, bool init)
1572 {
1573         struct lfsck_instance           *lfsck   = com->lc_lfsck;
1574         struct lfsck_layout             *lo      = com->lc_file_ram;
1575         struct lfsck_layout_master_data *llmd    = com->lc_data;
1576         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
1577         struct ptlrpc_thread            *athread = &llmd->llmd_thread;
1578         struct l_wait_info               lwi     = { 0 };
1579         int                              rc;
1580
1581         if (com->lc_new_checked == 0 && !init)
1582                 return 0;
1583
1584         l_wait_event(mthread->t_ctl_waitq,
1585                      (list_empty(&llmd->llmd_req_list) &&
1586                       atomic_read(&llmd->llmd_rpcs_in_flight) == 0) ||
1587                      !thread_is_running(mthread) ||
1588                      thread_is_stopped(athread),
1589                      &lwi);
1590
1591         if (!thread_is_running(mthread) || thread_is_stopped(athread))
1592                 return 0;
1593
1594         down_write(&com->lc_sem);
1595         if (init) {
1596                 lo->ll_pos_latest_start = lfsck->li_pos_current.lp_oit_cookie;
1597         } else {
1598                 lo->ll_pos_last_checkpoint =
1599                                         lfsck->li_pos_current.lp_oit_cookie;
1600                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
1601                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1602                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
1603                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
1604                 com->lc_new_checked = 0;
1605         }
1606
1607         rc = lfsck_layout_store(env, com);
1608         up_write(&com->lc_sem);
1609
1610         return rc;
1611 }
1612
1613 static int lfsck_layout_slave_checkpoint(const struct lu_env *env,
1614                                          struct lfsck_component *com, bool init)
1615 {
1616         struct lfsck_instance   *lfsck = com->lc_lfsck;
1617         struct lfsck_layout     *lo    = com->lc_file_ram;
1618         int                      rc;
1619
1620         if (com->lc_new_checked == 0 && !init)
1621                 return 0;
1622
1623         down_write(&com->lc_sem);
1624
1625         if (init) {
1626                 lo->ll_pos_latest_start = lfsck->li_pos_current.lp_oit_cookie;
1627         } else {
1628                 lo->ll_pos_last_checkpoint =
1629                                         lfsck->li_pos_current.lp_oit_cookie;
1630                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
1631                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1632                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
1633                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
1634                 com->lc_new_checked = 0;
1635         }
1636
1637         rc = lfsck_layout_store(env, com);
1638
1639         up_write(&com->lc_sem);
1640
1641         return rc;
1642 }
1643
1644 static int lfsck_layout_prep(const struct lu_env *env,
1645                              struct lfsck_component *com)
1646 {
1647         struct lfsck_instance   *lfsck  = com->lc_lfsck;
1648         struct lfsck_layout     *lo     = com->lc_file_ram;
1649         struct lfsck_position   *pos    = &com->lc_pos_start;
1650
1651         fid_zero(&pos->lp_dir_parent);
1652         pos->lp_dir_cookie = 0;
1653         if (lo->ll_status == LS_COMPLETED ||
1654             lo->ll_status == LS_PARTIAL) {
1655                 int rc;
1656
1657                 rc = lfsck_layout_reset(env, com, false);
1658                 if (rc != 0)
1659                         return rc;
1660         }
1661
1662         down_write(&com->lc_sem);
1663
1664         lo->ll_time_latest_start = cfs_time_current_sec();
1665
1666         spin_lock(&lfsck->li_lock);
1667         if (lo->ll_flags & LF_SCANNED_ONCE) {
1668                 if (!lfsck->li_drop_dryrun ||
1669                     lo->ll_pos_first_inconsistent == 0) {
1670                         lo->ll_status = LS_SCANNING_PHASE2;
1671                         list_del_init(&com->lc_link);
1672                         list_add_tail(&com->lc_link,
1673                                       &lfsck->li_list_double_scan);
1674                         pos->lp_oit_cookie = 0;
1675                 } else {
1676                         int i;
1677
1678                         lo->ll_status = LS_SCANNING_PHASE1;
1679                         lo->ll_run_time_phase1 = 0;
1680                         lo->ll_run_time_phase2 = 0;
1681                         lo->ll_objs_checked_phase1 = 0;
1682                         lo->ll_objs_checked_phase2 = 0;
1683                         lo->ll_objs_failed_phase1 = 0;
1684                         lo->ll_objs_failed_phase2 = 0;
1685                         for (i = 0; i < LLIT_MAX; i++)
1686                                 lo->ll_objs_repaired[i] = 0;
1687
1688                         pos->lp_oit_cookie = lo->ll_pos_first_inconsistent;
1689                 }
1690         } else {
1691                 lo->ll_status = LS_SCANNING_PHASE1;
1692                 if (!lfsck->li_drop_dryrun ||
1693                     lo->ll_pos_first_inconsistent == 0)
1694                         pos->lp_oit_cookie = lo->ll_pos_last_checkpoint + 1;
1695                 else
1696                         pos->lp_oit_cookie = lo->ll_pos_first_inconsistent;
1697         }
1698         spin_unlock(&lfsck->li_lock);
1699
1700         up_write(&com->lc_sem);
1701
1702         return 0;
1703 }
1704
1705 static int lfsck_layout_slave_prep(const struct lu_env *env,
1706                                    struct lfsck_component *com,
1707                                    struct lfsck_start_param *lsp)
1708 {
1709         struct lfsck_layout             *lo     = com->lc_file_ram;
1710         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
1711         int                              rc;
1712
1713         /* XXX: For a new scanning, generate OST-objects
1714          *      bitmap for orphan detection. */
1715
1716         rc = lfsck_layout_prep(env, com);
1717         if (rc != 0 || lo->ll_status != LS_SCANNING_PHASE1 ||
1718             !lsp->lsp_index_valid)
1719                 return rc;
1720
1721         rc = lfsck_layout_llst_add(llsd, lsp->lsp_index);
1722
1723         return rc;
1724 }
1725
1726 static int lfsck_layout_master_prep(const struct lu_env *env,
1727                                     struct lfsck_component *com,
1728                                     struct lfsck_start_param *lsp)
1729 {
1730         struct lfsck_instance           *lfsck   = com->lc_lfsck;
1731         struct lfsck_layout_master_data *llmd    = com->lc_data;
1732         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
1733         struct ptlrpc_thread            *athread = &llmd->llmd_thread;
1734         struct lfsck_thread_args        *lta;
1735         long                             rc;
1736         ENTRY;
1737
1738         rc = lfsck_layout_prep(env, com);
1739         if (rc != 0)
1740                 RETURN(rc);
1741
1742         llmd->llmd_assistant_status = 0;
1743         llmd->llmd_post_result = 0;
1744         llmd->llmd_to_post = 0;
1745         llmd->llmd_to_double_scan = 0;
1746         llmd->llmd_in_double_scan = 0;
1747         llmd->llmd_exit = 0;
1748         thread_set_flags(athread, 0);
1749
1750         lta = lfsck_thread_args_init(lfsck, com, lsp);
1751         if (IS_ERR(lta))
1752                 RETURN(PTR_ERR(lta));
1753
1754         rc = PTR_ERR(kthread_run(lfsck_layout_assistant, lta, "lfsck_layout"));
1755         if (IS_ERR_VALUE(rc)) {
1756                 CERROR("%s: Cannot start LFSCK layout assistant thread: "
1757                        "rc = %ld\n", lfsck_lfsck2name(lfsck), rc);
1758                 lfsck_thread_args_fini(lta);
1759         } else {
1760                 struct l_wait_info lwi = { 0 };
1761
1762                 l_wait_event(mthread->t_ctl_waitq,
1763                              thread_is_running(athread) ||
1764                              thread_is_stopped(athread),
1765                              &lwi);
1766                 if (unlikely(!thread_is_running(athread)))
1767                         rc = llmd->llmd_assistant_status;
1768                 else
1769                         rc = 0;
1770         }
1771
1772         RETURN(rc);
1773 }
1774
1775 static int lfsck_layout_master_exec_oit(const struct lu_env *env,
1776                                         struct lfsck_component *com,
1777                                         struct dt_object *obj)
1778 {
1779         /* XXX: To be implemented in other patches.
1780          *
1781          * For the given object, read its layout EA locally. For each stripe,
1782          * pre-fetch the OST-object's attribute and generate an structure
1783          * lfsck_layout_req on the list ::llmd_req_list.
1784          *
1785          * For each request on the ::llmd_req_list, the lfsck_layout_assistant
1786          * thread will compare the OST side attribute with local attribute,
1787          * if inconsistent, then repair it.
1788          *
1789          * All above processing is async mode with pipeline. */
1790
1791         return 0;
1792 }
1793
1794 static int lfsck_layout_slave_exec_oit(const struct lu_env *env,
1795                                        struct lfsck_component *com,
1796                                        struct dt_object *obj)
1797 {
1798         struct lfsck_instance           *lfsck  = com->lc_lfsck;
1799         struct lfsck_layout             *lo     = com->lc_file_ram;
1800         const struct lu_fid             *fid    = lfsck_dto2fid(obj);
1801         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
1802         struct lfsck_layout_seq         *lls;
1803         __u64                            seq;
1804         __u64                            oid;
1805         int                              rc;
1806         ENTRY;
1807
1808         /* XXX: Update OST-objects bitmap for orphan detection. */
1809
1810         LASSERT(llsd != NULL);
1811
1812         down_write(&com->lc_sem);
1813         if (fid_is_idif(fid))
1814                 seq = 0;
1815         else if (!fid_is_norm(fid) ||
1816                  !fid_is_for_ostobj(env, lfsck->li_next, obj, fid))
1817                 GOTO(unlock, rc = 0);
1818         else
1819                 seq = fid_seq(fid);
1820         com->lc_new_checked++;
1821
1822         lls = lfsck_layout_seq_lookup(llsd, seq);
1823         if (lls == NULL) {
1824                 OBD_ALLOC_PTR(lls);
1825                 if (unlikely(lls == NULL))
1826                         GOTO(unlock, rc = -ENOMEM);
1827
1828                 INIT_LIST_HEAD(&lls->lls_list);
1829                 lls->lls_seq = seq;
1830                 rc = lfsck_layout_lastid_load(env, com, lls);
1831                 if (rc != 0) {
1832                         lo->ll_objs_failed_phase1++;
1833                         OBD_FREE_PTR(lls);
1834                         GOTO(unlock, rc);
1835                 }
1836
1837                 lfsck_layout_seq_insert(llsd, lls);
1838         }
1839
1840         if (unlikely(fid_is_last_id(fid)))
1841                 GOTO(unlock, rc = 0);
1842
1843         oid = fid_oid(fid);
1844         if (oid > lls->lls_lastid_known)
1845                 lls->lls_lastid_known = oid;
1846
1847         if (oid > lls->lls_lastid) {
1848                 if (!(lo->ll_flags & LF_CRASHED_LASTID)) {
1849                         /* OFD may create new objects during LFSCK scanning. */
1850                         rc = lfsck_layout_lastid_reload(env, com, lls);
1851                         if (unlikely(rc != 0))
1852                                 CWARN("%s: failed to reload LAST_ID for "LPX64
1853                                       ": rc = %d\n",
1854                                       lfsck_lfsck2name(com->lc_lfsck),
1855                                       lls->lls_seq, rc);
1856                         if (oid <= lls->lls_lastid)
1857                                 GOTO(unlock, rc = 0);
1858
1859                         LASSERT(lfsck->li_out_notify != NULL);
1860
1861                         lfsck->li_out_notify(env, lfsck->li_out_notify_data,
1862                                              LE_LASTID_REBUILDING);
1863                         lo->ll_flags |= LF_CRASHED_LASTID;
1864                 }
1865
1866                 lls->lls_lastid = oid;
1867                 lls->lls_dirty = 1;
1868         }
1869
1870         GOTO(unlock, rc = 0);
1871
1872 unlock:
1873         up_write(&com->lc_sem);
1874
1875         return rc;
1876 }
1877
1878 static int lfsck_layout_exec_dir(const struct lu_env *env,
1879                                  struct lfsck_component *com,
1880                                  struct dt_object *obj,
1881                                  struct lu_dirent *ent)
1882 {
1883         return 0;
1884 }
1885
1886 static int lfsck_layout_master_post(const struct lu_env *env,
1887                                     struct lfsck_component *com,
1888                                     int result, bool init)
1889 {
1890         struct lfsck_instance           *lfsck   = com->lc_lfsck;
1891         struct lfsck_layout             *lo      = com->lc_file_ram;
1892         struct lfsck_layout_master_data *llmd    = com->lc_data;
1893         struct ptlrpc_thread            *mthread = &lfsck->li_thread;
1894         struct ptlrpc_thread            *athread = &llmd->llmd_thread;
1895         struct l_wait_info               lwi     = { 0 };
1896         int                              rc;
1897         ENTRY;
1898
1899
1900         llmd->llmd_post_result = result;
1901         llmd->llmd_to_post = 1;
1902         if (llmd->llmd_post_result <= 0)
1903                 llmd->llmd_exit = 1;
1904
1905         wake_up_all(&athread->t_ctl_waitq);
1906         l_wait_event(mthread->t_ctl_waitq,
1907                      (result > 0 && list_empty(&llmd->llmd_req_list) &&
1908                       atomic_read(&llmd->llmd_rpcs_in_flight) == 0) ||
1909                      thread_is_stopped(athread),
1910                      &lwi);
1911
1912         if (llmd->llmd_assistant_status < 0)
1913                 result = llmd->llmd_assistant_status;
1914
1915         down_write(&com->lc_sem);
1916         spin_lock(&lfsck->li_lock);
1917         /* When LFSCK failed, there may be some prefetched objects those are
1918          * not been processed yet, we do not know the exactly position, then
1919          * just restart from last check-point next time. */
1920         if (!init && !llmd->llmd_exit)
1921                 lo->ll_pos_last_checkpoint =
1922                                         lfsck->li_pos_current.lp_oit_cookie;
1923
1924         if (result > 0) {
1925                 lo->ll_status = LS_SCANNING_PHASE2;
1926                 lo->ll_flags |= LF_SCANNED_ONCE;
1927                 lo->ll_flags &= ~LF_UPGRADE;
1928                 list_del_init(&com->lc_link);
1929                 list_add_tail(&com->lc_link, &lfsck->li_list_double_scan);
1930         } else if (result == 0) {
1931                 lo->ll_status = lfsck->li_status;
1932                 if (lo->ll_status == 0)
1933                         lo->ll_status = LS_STOPPED;
1934                 if (lo->ll_status != LS_PAUSED) {
1935                         list_del_init(&com->lc_link);
1936                         list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1937                 }
1938         } else {
1939                 lo->ll_status = LS_FAILED;
1940                 list_del_init(&com->lc_link);
1941                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1942         }
1943         spin_unlock(&lfsck->li_lock);
1944
1945         if (!init) {
1946                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
1947                                 HALF_SEC - lfsck->li_time_last_checkpoint);
1948                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
1949                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
1950                 com->lc_new_checked = 0;
1951         }
1952
1953         rc = lfsck_layout_store(env, com);
1954         up_write(&com->lc_sem);
1955
1956         RETURN(rc);
1957 }
1958
1959 static int lfsck_layout_slave_post(const struct lu_env *env,
1960                                    struct lfsck_component *com,
1961                                    int result, bool init)
1962 {
1963         struct lfsck_instance   *lfsck = com->lc_lfsck;
1964         struct lfsck_layout     *lo    = com->lc_file_ram;
1965         int                      rc;
1966         bool                     done  = false;
1967
1968         rc = lfsck_layout_lastid_store(env, com);
1969         if (rc != 0)
1970                 result = rc;
1971
1972         LASSERT(lfsck->li_out_notify != NULL);
1973
1974         down_write(&com->lc_sem);
1975
1976         spin_lock(&lfsck->li_lock);
1977         if (!init)
1978                 lo->ll_pos_last_checkpoint =
1979                                         lfsck->li_pos_current.lp_oit_cookie;
1980         if (result > 0) {
1981                 lo->ll_status = LS_SCANNING_PHASE2;
1982                 lo->ll_flags |= LF_SCANNED_ONCE;
1983                 if (lo->ll_flags & LF_CRASHED_LASTID) {
1984                         done = true;
1985                         lo->ll_flags &= ~LF_CRASHED_LASTID;
1986                 }
1987                 lo->ll_flags &= ~LF_UPGRADE;
1988                 list_del_init(&com->lc_link);
1989                 list_add_tail(&com->lc_link, &lfsck->li_list_double_scan);
1990         } else if (result == 0) {
1991                 lo->ll_status = lfsck->li_status;
1992                 if (lo->ll_status == 0)
1993                         lo->ll_status = LS_STOPPED;
1994                 if (lo->ll_status != LS_PAUSED) {
1995                         list_del_init(&com->lc_link);
1996                         list_add_tail(&com->lc_link, &lfsck->li_list_idle);
1997                 }
1998         } else {
1999                 lo->ll_status = LS_FAILED;
2000                 list_del_init(&com->lc_link);
2001                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
2002         }
2003         spin_unlock(&lfsck->li_lock);
2004
2005         if (done)
2006                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
2007                                      LE_LASTID_REBUILT);
2008
2009         if (!init) {
2010                 lo->ll_run_time_phase1 += cfs_duration_sec(cfs_time_current() +
2011                                 HALF_SEC - lfsck->li_time_last_checkpoint);
2012                 lo->ll_time_last_checkpoint = cfs_time_current_sec();
2013                 lo->ll_objs_checked_phase1 += com->lc_new_checked;
2014                 com->lc_new_checked = 0;
2015         }
2016
2017         rc = lfsck_layout_store(env, com);
2018
2019         up_write(&com->lc_sem);
2020
2021         lfsck_layout_slave_notify_master(env, com, LE_PHASE1_DONE, result);
2022
2023         return rc;
2024 }
2025
2026 static int lfsck_layout_dump(const struct lu_env *env,
2027                              struct lfsck_component *com, char *buf, int len)
2028 {
2029         struct lfsck_instance   *lfsck = com->lc_lfsck;
2030         struct lfsck_bookmark   *bk    = &lfsck->li_bookmark_ram;
2031         struct lfsck_layout     *lo    = com->lc_file_ram;
2032         int                      save  = len;
2033         int                      ret   = -ENOSPC;
2034         int                      rc;
2035
2036         down_read(&com->lc_sem);
2037         rc = snprintf(buf, len,
2038                       "name: lfsck_layout\n"
2039                       "magic: %#x\n"
2040                       "version: %d\n"
2041                       "status: %s\n",
2042                       lo->ll_magic,
2043                       bk->lb_version,
2044                       lfsck_status2names(lo->ll_status));
2045         if (rc <= 0)
2046                 goto out;
2047
2048         buf += rc;
2049         len -= rc;
2050         rc = lfsck_bits_dump(&buf, &len, lo->ll_flags, lfsck_flags_names,
2051                              "flags");
2052         if (rc < 0)
2053                 goto out;
2054
2055         rc = lfsck_bits_dump(&buf, &len, bk->lb_param, lfsck_param_names,
2056                              "param");
2057         if (rc < 0)
2058                 goto out;
2059
2060         rc = lfsck_time_dump(&buf, &len, lo->ll_time_last_complete,
2061                              "time_since_last_completed");
2062         if (rc < 0)
2063                 goto out;
2064
2065         rc = lfsck_time_dump(&buf, &len, lo->ll_time_latest_start,
2066                              "time_since_latest_start");
2067         if (rc < 0)
2068                 goto out;
2069
2070         rc = lfsck_time_dump(&buf, &len, lo->ll_time_last_checkpoint,
2071                              "time_since_last_checkpoint");
2072         if (rc < 0)
2073                 goto out;
2074
2075         rc = snprintf(buf, len,
2076                       "latest_start_position: "LPU64"\n"
2077                       "last_checkpoint_position: "LPU64"\n"
2078                       "first_failure_position: "LPU64"\n",
2079                       lo->ll_pos_latest_start,
2080                       lo->ll_pos_last_checkpoint,
2081                       lo->ll_pos_first_inconsistent);
2082         if (rc <= 0)
2083                 goto out;
2084
2085         buf += rc;
2086         len -= rc;
2087
2088         rc = snprintf(buf, len,
2089                       "success_count: %u\n"
2090                       "repaired_dangling: "LPU64"\n"
2091                       "repaired_unmatched_pair: "LPU64"\n"
2092                       "repaired_multiple_referenced: "LPU64"\n"
2093                       "repaired_orphan: "LPU64"\n"
2094                       "repaired_inconsistent_owner: "LPU64"\n"
2095                       "repaired_others: "LPU64"\n"
2096                       "skipped: "LPU64"\n"
2097                       "failed_phase1: "LPU64"\n"
2098                       "failed_phase2: "LPU64"\n",
2099                       lo->ll_success_count,
2100                       lo->ll_objs_repaired[LLIT_DANGLING - 1],
2101                       lo->ll_objs_repaired[LLIT_UNMATCHED_PAIR - 1],
2102                       lo->ll_objs_repaired[LLIT_MULTIPLE_REFERENCED - 1],
2103                       lo->ll_objs_repaired[LLIT_ORPHAN - 1],
2104                       lo->ll_objs_repaired[LLIT_INCONSISTENT_OWNER - 1],
2105                       lo->ll_objs_repaired[LLIT_OTHERS - 1],
2106                       lo->ll_objs_skipped,
2107                       lo->ll_objs_failed_phase1,
2108                       lo->ll_objs_failed_phase2);
2109         if (rc <= 0)
2110                 goto out;
2111
2112         buf += rc;
2113         len -= rc;
2114
2115         if (lo->ll_status == LS_SCANNING_PHASE1) {
2116                 __u64 pos;
2117                 const struct dt_it_ops *iops;
2118                 cfs_duration_t duration = cfs_time_current() -
2119                                           lfsck->li_time_last_checkpoint;
2120                 __u64 checked = lo->ll_objs_checked_phase1 + com->lc_new_checked;
2121                 __u64 speed = checked;
2122                 __u64 new_checked = com->lc_new_checked * HZ;
2123                 __u32 rtime = lo->ll_run_time_phase1 +
2124                               cfs_duration_sec(duration + HALF_SEC);
2125
2126                 if (duration != 0)
2127                         do_div(new_checked, duration);
2128                 if (rtime != 0)
2129                         do_div(speed, rtime);
2130                 rc = snprintf(buf, len,
2131                               "checked_phase1: "LPU64"\n"
2132                               "checked_phase2: "LPU64"\n"
2133                               "run_time_phase1: %u seconds\n"
2134                               "run_time_phase2: %u seconds\n"
2135                               "average_speed_phase1: "LPU64" items/sec\n"
2136                               "average_speed_phase2: N/A\n"
2137                               "real-time_speed_phase1: "LPU64" items/sec\n"
2138                               "real-time_speed_phase2: N/A\n",
2139                               checked,
2140                               lo->ll_objs_checked_phase2,
2141                               rtime,
2142                               lo->ll_run_time_phase2,
2143                               speed,
2144                               new_checked);
2145                 if (rc <= 0)
2146                         goto out;
2147
2148                 buf += rc;
2149                 len -= rc;
2150
2151                 LASSERT(lfsck->li_di_oit != NULL);
2152
2153                 iops = &lfsck->li_obj_oit->do_index_ops->dio_it;
2154
2155                 /* The low layer otable-based iteration position may NOT
2156                  * exactly match the layout-based directory traversal
2157                  * cookie. Generally, it is not a serious issue. But the
2158                  * caller should NOT make assumption on that. */
2159                 pos = iops->store(env, lfsck->li_di_oit);
2160                 if (!lfsck->li_current_oit_processed)
2161                         pos--;
2162                 rc = snprintf(buf, len, "current_position: "LPU64"\n", pos);
2163                 if (rc <= 0)
2164                         goto out;
2165
2166                 buf += rc;
2167                 len -= rc;
2168         } else {
2169                 /* XXX: LS_SCANNING_PHASE2 will be handled in the future. */
2170                 __u64 speed1 = lo->ll_objs_checked_phase1;
2171                 __u64 speed2 = lo->ll_objs_checked_phase2;
2172
2173                 if (lo->ll_run_time_phase1 != 0)
2174                         do_div(speed1, lo->ll_run_time_phase1);
2175                 if (lo->ll_run_time_phase2 != 0)
2176                         do_div(speed2, lo->ll_run_time_phase2);
2177                 rc = snprintf(buf, len,
2178                               "checked_phase1: "LPU64"\n"
2179                               "checked_phase2: "LPU64"\n"
2180                               "run_time_phase1: %u seconds\n"
2181                               "run_time_phase2: %u seconds\n"
2182                               "average_speed_phase1: "LPU64" items/sec\n"
2183                               "average_speed_phase2: "LPU64" objs/sec\n"
2184                               "real-time_speed_phase1: N/A\n"
2185                               "real-time_speed_phase2: N/A\n"
2186                               "current_position: N/A\n",
2187                               lo->ll_objs_checked_phase1,
2188                               lo->ll_objs_checked_phase2,
2189                               lo->ll_run_time_phase1,
2190                               lo->ll_run_time_phase2,
2191                               speed1,
2192                               speed2);
2193                 if (rc <= 0)
2194                         goto out;
2195
2196                 buf += rc;
2197                 len -= rc;
2198         }
2199         ret = save - len;
2200
2201 out:
2202         up_read(&com->lc_sem);
2203
2204         return ret;
2205 }
2206
2207 static int lfsck_layout_master_double_scan(const struct lu_env *env,
2208                                            struct lfsck_component *com)
2209 {
2210         struct lfsck_layout_master_data *llmd    = com->lc_data;
2211         struct ptlrpc_thread            *mthread = &com->lc_lfsck->li_thread;
2212         struct ptlrpc_thread            *athread = &llmd->llmd_thread;
2213         struct lfsck_layout             *lo      = com->lc_file_ram;
2214         struct l_wait_info               lwi     = { 0 };
2215
2216         if (unlikely(lo->ll_status != LS_SCANNING_PHASE2))
2217                 return 0;
2218
2219         llmd->llmd_to_double_scan = 1;
2220         wake_up_all(&athread->t_ctl_waitq);
2221         l_wait_event(mthread->t_ctl_waitq,
2222                      llmd->llmd_in_double_scan ||
2223                      thread_is_stopped(athread),
2224                      &lwi);
2225         if (llmd->llmd_assistant_status < 0)
2226                 return llmd->llmd_assistant_status;
2227
2228         return 0;
2229 }
2230
2231 static int lfsck_layout_slave_double_scan(const struct lu_env *env,
2232                                           struct lfsck_component *com)
2233 {
2234         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2235         struct lfsck_layout_slave_data  *llsd   = com->lc_data;
2236         struct lfsck_layout             *lo     = com->lc_file_ram;
2237         struct ptlrpc_thread            *thread = &lfsck->li_thread;
2238         int                              rc;
2239         ENTRY;
2240
2241         if (unlikely(lo->ll_status != LS_SCANNING_PHASE2))
2242                 RETURN(0);
2243
2244         atomic_inc(&lfsck->li_double_scan_count);
2245
2246         com->lc_new_checked = 0;
2247         com->lc_new_scanned = 0;
2248         com->lc_time_last_checkpoint = cfs_time_current();
2249         com->lc_time_next_checkpoint = com->lc_time_last_checkpoint +
2250                                 cfs_time_seconds(LFSCK_CHECKPOINT_INTERVAL);
2251
2252         while (1) {
2253                 struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(30),
2254                                                      NULL, NULL);
2255
2256                 rc = lfsck_layout_slave_query_master(env, com);
2257                 if (list_empty(&llsd->llsd_master_list)) {
2258                         if (unlikely(!thread_is_running(thread)))
2259                                 rc = 0;
2260                         else
2261                                 rc = 1;
2262
2263                         GOTO(done, rc);
2264                 }
2265
2266                 if (rc < 0)
2267                         GOTO(done, rc);
2268
2269                 rc = l_wait_event(thread->t_ctl_waitq,
2270                                   !thread_is_running(thread) ||
2271                                   list_empty(&llsd->llsd_master_list),
2272                                   &lwi);
2273                 if (unlikely(!thread_is_running(thread)))
2274                         GOTO(done, rc = 0);
2275
2276                 if (rc == -ETIMEDOUT)
2277                         continue;
2278
2279                 GOTO(done, rc = (rc < 0 ? rc : 1));
2280         }
2281
2282 done:
2283         rc = lfsck_layout_double_scan_result(env, com, rc);
2284
2285         if (atomic_dec_and_test(&lfsck->li_double_scan_count))
2286                 wake_up_all(&lfsck->li_thread.t_ctl_waitq);
2287
2288         return rc;
2289 }
2290
2291 static void lfsck_layout_master_data_release(const struct lu_env *env,
2292                                              struct lfsck_component *com)
2293 {
2294         struct lfsck_layout_master_data *llmd   = com->lc_data;
2295         struct lfsck_instance           *lfsck  = com->lc_lfsck;
2296         struct lfsck_tgt_descs          *ltds;
2297         struct lfsck_tgt_desc           *ltd;
2298         struct lfsck_tgt_desc           *next;
2299
2300         LASSERT(llmd != NULL);
2301         LASSERT(thread_is_init(&llmd->llmd_thread) ||
2302                 thread_is_stopped(&llmd->llmd_thread));
2303         LASSERT(list_empty(&llmd->llmd_req_list));
2304         LASSERT(atomic_read(&llmd->llmd_rpcs_in_flight) == 0);
2305
2306         com->lc_data = NULL;
2307
2308         ltds = &lfsck->li_ost_descs;
2309         spin_lock(&ltds->ltd_lock);
2310         list_for_each_entry_safe(ltd, next, &llmd->llmd_ost_phase1_list,
2311                                  ltd_layout_phase_list) {
2312                 list_del_init(&ltd->ltd_layout_phase_list);
2313         }
2314         list_for_each_entry_safe(ltd, next, &llmd->llmd_ost_phase2_list,
2315                                  ltd_layout_phase_list) {
2316                 list_del_init(&ltd->ltd_layout_phase_list);
2317         }
2318         list_for_each_entry_safe(ltd, next, &llmd->llmd_ost_list,
2319                                  ltd_layout_list) {
2320                 list_del_init(&ltd->ltd_layout_list);
2321         }
2322         spin_unlock(&ltds->ltd_lock);
2323
2324         OBD_FREE_PTR(llmd);
2325 }
2326
2327 static void lfsck_layout_slave_data_release(const struct lu_env *env,
2328                                             struct lfsck_component *com)
2329 {
2330         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
2331         struct lfsck_layout_seq          *lls;
2332         struct lfsck_layout_seq          *next;
2333         struct lfsck_layout_slave_target *llst;
2334         struct lfsck_layout_slave_target *tmp;
2335
2336         LASSERT(llsd != NULL);
2337
2338         com->lc_data = NULL;
2339
2340         list_for_each_entry_safe(lls, next, &llsd->llsd_seq_list,
2341                                      lls_list) {
2342                 list_del_init(&lls->lls_list);
2343                 lfsck_object_put(env, lls->lls_lastid_obj);
2344                 OBD_FREE_PTR(lls);
2345         }
2346
2347         list_for_each_entry_safe(llst, tmp, &llsd->llsd_master_list,
2348                                  llst_list) {
2349                 list_del_init(&llst->llst_list);
2350                 OBD_FREE_PTR(llst);
2351         }
2352
2353         OBD_FREE_PTR(llsd);
2354 }
2355
2356 static void lfsck_layout_master_quit(const struct lu_env *env,
2357                                      struct lfsck_component *com)
2358 {
2359         struct lfsck_layout_master_data *llmd    = com->lc_data;
2360         struct ptlrpc_thread            *mthread = &com->lc_lfsck->li_thread;
2361         struct ptlrpc_thread            *athread = &llmd->llmd_thread;
2362         struct l_wait_info               lwi     = { 0 };
2363
2364         llmd->llmd_exit = 1;
2365         wake_up_all(&athread->t_ctl_waitq);
2366         l_wait_event(mthread->t_ctl_waitq,
2367                      thread_is_init(athread) ||
2368                      thread_is_stopped(athread),
2369                      &lwi);
2370 }
2371
2372 static int lfsck_layout_master_in_notify(const struct lu_env *env,
2373                                          struct lfsck_component *com,
2374                                          struct lfsck_request *lr)
2375 {
2376         struct lfsck_instance           *lfsck = com->lc_lfsck;
2377         struct lfsck_layout             *lo    = com->lc_file_ram;
2378         struct lfsck_layout_master_data *llmd  = com->lc_data;
2379         struct lfsck_tgt_descs          *ltds;
2380         struct lfsck_tgt_desc           *ltd;
2381         ENTRY;
2382
2383         if (lr->lr_event != LE_PHASE1_DONE)
2384                 RETURN(-EINVAL);
2385
2386         ltds = &lfsck->li_ost_descs;
2387         spin_lock(&ltds->ltd_lock);
2388         ltd = LTD_TGT(ltds, lr->lr_index);
2389         if (ltd == NULL) {
2390                 spin_unlock(&ltds->ltd_lock);
2391
2392                 RETURN(-ENODEV);
2393         }
2394
2395         list_del_init(&ltd->ltd_layout_phase_list);
2396         if (lr->lr_status > 0) {
2397                 if (list_empty(&ltd->ltd_layout_list))
2398                         list_add_tail(&ltd->ltd_layout_list,
2399                                       &llmd->llmd_ost_list);
2400                 list_add_tail(&ltd->ltd_layout_phase_list,
2401                               &llmd->llmd_ost_phase2_list);
2402         } else {
2403                 ltd->ltd_layout_done = 1;
2404                 list_del_init(&ltd->ltd_layout_list);
2405                 lo->ll_flags |= LF_INCOMPLETE;
2406         }
2407         spin_unlock(&ltds->ltd_lock);
2408
2409         if (lfsck_layout_master_to_orphan(llmd))
2410                 wake_up_all(&llmd->llmd_thread.t_ctl_waitq);
2411
2412         RETURN(0);
2413 }
2414
2415 static int lfsck_layout_slave_in_notify(const struct lu_env *env,
2416                                         struct lfsck_component *com,
2417                                         struct lfsck_request *lr)
2418 {
2419         struct lfsck_instance            *lfsck = com->lc_lfsck;
2420         struct lfsck_layout_slave_data   *llsd  = com->lc_data;
2421         struct lfsck_layout_slave_target *llst;
2422         ENTRY;
2423
2424         if (lr->lr_event != LE_PHASE2_DONE &&
2425             lr->lr_event != LE_STOP)
2426                 RETURN(-EINVAL);
2427
2428         llst = lfsck_layout_llst_find_and_del(llsd, lr->lr_index);
2429         if (llst == NULL)
2430                 RETURN(-ENODEV);
2431
2432         lfsck_layout_llst_put(llst);
2433         if (list_empty(&llsd->llsd_master_list)) {
2434                 switch (lr->lr_event) {
2435                 case LE_PHASE2_DONE:
2436                         wake_up_all(&lfsck->li_thread.t_ctl_waitq);
2437                         break;
2438                 case LE_STOP: {
2439                         struct lfsck_stop *stop = &lfsck_env_info(env)->lti_stop;
2440
2441                         memset(stop, 0, sizeof(*stop));
2442                         stop->ls_status = lr->lr_status;
2443                         stop->ls_flags = lr->lr_param;
2444                         lfsck_stop(env, lfsck->li_bottom, stop);
2445                         break;
2446                 }
2447                 default:
2448                         break;
2449                 }
2450         }
2451
2452         RETURN(0);
2453 }
2454
2455 static int lfsck_layout_query(const struct lu_env *env,
2456                               struct lfsck_component *com)
2457 {
2458         struct lfsck_layout *lo = com->lc_file_ram;
2459
2460         return lo->ll_status;
2461 }
2462
2463 static int lfsck_layout_master_stop_notify(const struct lu_env *env,
2464                                            struct lfsck_component *com,
2465                                            struct lfsck_tgt_descs *ltds,
2466                                            struct lfsck_tgt_desc *ltd,
2467                                            struct ptlrpc_request_set *set)
2468 {
2469         struct lfsck_thread_info          *info  = lfsck_env_info(env);
2470         struct lfsck_async_interpret_args *laia  = &info->lti_laia;
2471         struct lfsck_request              *lr    = &info->lti_lr;
2472         struct lfsck_instance             *lfsck = com->lc_lfsck;
2473         int                                rc;
2474
2475         LASSERT(list_empty(&ltd->ltd_layout_list));
2476         LASSERT(list_empty(&ltd->ltd_layout_phase_list));
2477
2478         memset(lr, 0, sizeof(*lr));
2479         lr->lr_index = lfsck_dev_idx(lfsck->li_bottom);
2480         lr->lr_event = LE_STOP;
2481         lr->lr_active = LT_LAYOUT;
2482         lr->lr_status = LS_CO_STOPPED;
2483
2484         laia->laia_com = com;
2485         laia->laia_ltds = ltds;
2486         laia->laia_ltd = ltd;
2487         laia->laia_lr = lr;
2488
2489         rc = lfsck_async_request(env, ltd->ltd_exp, lr, set,
2490                                  lfsck_layout_master_async_interpret,
2491                                  laia, LFSCK_NOTIFY);
2492         if (rc != 0)
2493                 CERROR("%s: Fail to notify OST %x for stop: rc = %d\n",
2494                        lfsck_lfsck2name(lfsck), ltd->ltd_index, rc);
2495
2496         return rc;
2497 }
2498
2499 static struct lfsck_operations lfsck_layout_master_ops = {
2500         .lfsck_reset            = lfsck_layout_reset,
2501         .lfsck_fail             = lfsck_layout_fail,
2502         .lfsck_checkpoint       = lfsck_layout_master_checkpoint,
2503         .lfsck_prep             = lfsck_layout_master_prep,
2504         .lfsck_exec_oit         = lfsck_layout_master_exec_oit,
2505         .lfsck_exec_dir         = lfsck_layout_exec_dir,
2506         .lfsck_post             = lfsck_layout_master_post,
2507         .lfsck_dump             = lfsck_layout_dump,
2508         .lfsck_double_scan      = lfsck_layout_master_double_scan,
2509         .lfsck_data_release     = lfsck_layout_master_data_release,
2510         .lfsck_quit             = lfsck_layout_master_quit,
2511         .lfsck_in_notify        = lfsck_layout_master_in_notify,
2512         .lfsck_query            = lfsck_layout_query,
2513         .lfsck_stop_notify      = lfsck_layout_master_stop_notify,
2514 };
2515
2516 static struct lfsck_operations lfsck_layout_slave_ops = {
2517         .lfsck_reset            = lfsck_layout_reset,
2518         .lfsck_fail             = lfsck_layout_fail,
2519         .lfsck_checkpoint       = lfsck_layout_slave_checkpoint,
2520         .lfsck_prep             = lfsck_layout_slave_prep,
2521         .lfsck_exec_oit         = lfsck_layout_slave_exec_oit,
2522         .lfsck_exec_dir         = lfsck_layout_exec_dir,
2523         .lfsck_post             = lfsck_layout_slave_post,
2524         .lfsck_dump             = lfsck_layout_dump,
2525         .lfsck_double_scan      = lfsck_layout_slave_double_scan,
2526         .lfsck_data_release     = lfsck_layout_slave_data_release,
2527         .lfsck_in_notify        = lfsck_layout_slave_in_notify,
2528         .lfsck_query            = lfsck_layout_query,
2529 };
2530
2531 int lfsck_layout_setup(const struct lu_env *env, struct lfsck_instance *lfsck)
2532 {
2533         struct lfsck_component  *com;
2534         struct lfsck_layout     *lo;
2535         struct dt_object        *root = NULL;
2536         struct dt_object        *obj;
2537         int                      rc;
2538         ENTRY;
2539
2540         OBD_ALLOC_PTR(com);
2541         if (com == NULL)
2542                 RETURN(-ENOMEM);
2543
2544         INIT_LIST_HEAD(&com->lc_link);
2545         INIT_LIST_HEAD(&com->lc_link_dir);
2546         init_rwsem(&com->lc_sem);
2547         atomic_set(&com->lc_ref, 1);
2548         com->lc_lfsck = lfsck;
2549         com->lc_type = LT_LAYOUT;
2550         if (lfsck->li_master) {
2551                 struct lfsck_layout_master_data *llmd;
2552
2553                 com->lc_ops = &lfsck_layout_master_ops;
2554                 OBD_ALLOC_PTR(llmd);
2555                 if (llmd == NULL)
2556                         GOTO(out, rc = -ENOMEM);
2557
2558                 INIT_LIST_HEAD(&llmd->llmd_req_list);
2559                 INIT_LIST_HEAD(&llmd->llmd_ost_list);
2560                 INIT_LIST_HEAD(&llmd->llmd_ost_phase1_list);
2561                 INIT_LIST_HEAD(&llmd->llmd_ost_phase2_list);
2562                 spin_lock_init(&llmd->llmd_lock);
2563                 init_waitqueue_head(&llmd->llmd_thread.t_ctl_waitq);
2564                 atomic_set(&llmd->llmd_rpcs_in_flight, 0);
2565                 com->lc_data = llmd;
2566         } else {
2567                 struct lfsck_layout_slave_data *llsd;
2568
2569                 com->lc_ops = &lfsck_layout_slave_ops;
2570                 OBD_ALLOC_PTR(llsd);
2571                 if (llsd == NULL)
2572                         GOTO(out, rc = -ENOMEM);
2573
2574                 INIT_LIST_HEAD(&llsd->llsd_seq_list);
2575                 INIT_LIST_HEAD(&llsd->llsd_master_list);
2576                 spin_lock_init(&llsd->llsd_lock);
2577                 com->lc_data = llsd;
2578         }
2579         com->lc_file_size = sizeof(*lo);
2580         OBD_ALLOC(com->lc_file_ram, com->lc_file_size);
2581         if (com->lc_file_ram == NULL)
2582                 GOTO(out, rc = -ENOMEM);
2583
2584         OBD_ALLOC(com->lc_file_disk, com->lc_file_size);
2585         if (com->lc_file_disk == NULL)
2586                 GOTO(out, rc = -ENOMEM);
2587
2588         root = dt_locate(env, lfsck->li_bottom, &lfsck->li_local_root_fid);
2589         if (IS_ERR(root))
2590                 GOTO(out, rc = PTR_ERR(root));
2591
2592         if (unlikely(!dt_try_as_dir(env, root)))
2593                 GOTO(out, rc = -ENOTDIR);
2594
2595         obj = local_file_find_or_create(env, lfsck->li_los, root,
2596                                         lfsck_layout_name,
2597                                         S_IFREG | S_IRUGO | S_IWUSR);
2598         if (IS_ERR(obj))
2599                 GOTO(out, rc = PTR_ERR(obj));
2600
2601         com->lc_obj = obj;
2602         rc = lfsck_layout_load(env, com);
2603         if (rc > 0)
2604                 rc = lfsck_layout_reset(env, com, true);
2605         else if (rc == -ENOENT)
2606                 rc = lfsck_layout_init(env, com);
2607
2608         if (rc != 0)
2609                 GOTO(out, rc);
2610
2611         lo = com->lc_file_ram;
2612         switch (lo->ll_status) {
2613         case LS_INIT:
2614         case LS_COMPLETED:
2615         case LS_FAILED:
2616         case LS_STOPPED:
2617         case LS_PARTIAL:
2618                 spin_lock(&lfsck->li_lock);
2619                 list_add_tail(&com->lc_link, &lfsck->li_list_idle);
2620                 spin_unlock(&lfsck->li_lock);
2621                 break;
2622         default:
2623                 CERROR("%s: unknown lfsck_layout status: rc = %u\n",
2624                        lfsck_lfsck2name(lfsck), lo->ll_status);
2625                 /* fall through */
2626         case LS_SCANNING_PHASE1:
2627         case LS_SCANNING_PHASE2:
2628                 /* No need to store the status to disk right now.
2629                  * If the system crashed before the status stored,
2630                  * it will be loaded back when next time. */
2631                 lo->ll_status = LS_CRASHED;
2632                 lo->ll_flags |= LF_INCOMPLETE;
2633                 /* fall through */
2634         case LS_PAUSED:
2635         case LS_CRASHED:
2636         case LS_CO_FAILED:
2637         case LS_CO_STOPPED:
2638         case LS_CO_PAUSED:
2639                 spin_lock(&lfsck->li_lock);
2640                 list_add_tail(&com->lc_link, &lfsck->li_list_scan);
2641                 spin_unlock(&lfsck->li_lock);
2642                 break;
2643         }
2644
2645         if (lo->ll_flags & LF_CRASHED_LASTID) {
2646                 LASSERT(lfsck->li_out_notify != NULL);
2647
2648                 lfsck->li_out_notify(env, lfsck->li_out_notify_data,
2649                                      LE_LASTID_REBUILDING);
2650         }
2651
2652         GOTO(out, rc = 0);
2653
2654 out:
2655         if (root != NULL && !IS_ERR(root))
2656                 lu_object_put(env, &root->do_lu);
2657
2658         if (rc != 0)
2659                 lfsck_component_cleanup(env, com);
2660
2661         return rc;
2662 }