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LU-6210 osd: Change positional struct initializers to C99
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_scrub.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License version 2 for more details.  A copy is
14  * included in the COPYING file that accompanied this code.
15
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2012, 2016, Intel Corporation.
24  */
25 /*
26  * lustre/osd-ldiskfs/osd_scrub.c
27  *
28  * Top-level entry points into osd module
29  *
30  * The OI scrub is used for rebuilding Object Index files when restores MDT from
31  * file-level backup.
32  *
33  * The otable based iterator scans ldiskfs inode table to feed up layer LFSCK.
34  *
35  * Author: Fan Yong <yong.fan@whamcloud.com>
36  */
37
38 #define DEBUG_SUBSYSTEM S_LFSCK
39
40 #include <linux/kthread.h>
41 #include <lustre/lustre_idl.h>
42 #include <lustre_disk.h>
43 #include <dt_object.h>
44 #include <linux/xattr.h>
45
46 #include "osd_internal.h"
47 #include "osd_oi.h"
48 #include "osd_scrub.h"
49
50 #define HALF_SEC        msecs_to_jiffies(MSEC_PER_SEC >> 1)
51
52 #define OSD_OTABLE_MAX_HASH             0x00000000ffffffffULL
53
54 #define SCRUB_NEXT_BREAK        1 /* exit current loop and process next group */
55 #define SCRUB_NEXT_CONTINUE     2 /* skip current object and process next bit */
56 #define SCRUB_NEXT_EXIT         3 /* exit all the loops */
57 #define SCRUB_NEXT_WAIT         4 /* wait for free cache slot */
58 #define SCRUB_NEXT_CRASH        5 /* simulate system crash during OI scrub */
59 #define SCRUB_NEXT_FATAL        6 /* simulate failure during OI scrub */
60 #define SCRUB_NEXT_NOSCRUB      7 /* new created object, no scrub on it */
61 #define SCRUB_NEXT_NOLMA        8 /* the inode has no FID-in-LMA */
62 #define SCRUB_NEXT_OSTOBJ       9 /* for OST-object */
63 #define SCRUB_NEXT_OSTOBJ_OLD   10 /* old OST-object, no LMA or no FID-on-OST
64                                     * flags in LMA */
65
66 /* misc functions */
67
68 static inline struct osd_device *osd_scrub2dev(struct osd_scrub *scrub)
69 {
70         return container_of0(scrub, struct osd_device, od_scrub);
71 }
72
73 static inline struct super_block *osd_scrub2sb(struct osd_scrub *scrub)
74 {
75         return osd_sb(osd_scrub2dev(scrub));
76 }
77
78 static inline int osd_scrub_has_window(struct osd_scrub *scrub,
79                                        struct osd_otable_cache *ooc)
80 {
81         return scrub->os_pos_current < ooc->ooc_pos_preload + SCRUB_WINDOW_SIZE;
82 }
83
84 static inline const char *osd_scrub2name(struct osd_scrub *scrub)
85 {
86         return LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name;
87 }
88
89 /**
90  * update/insert/delete the specified OI mapping (@fid @id) according to the ops
91  *
92  * \retval   1, changed nothing
93  * \retval   0, changed successfully
94  * \retval -ve, on error
95  */
96 static int osd_scrub_refresh_mapping(struct osd_thread_info *info,
97                                      struct osd_device *dev,
98                                      const struct lu_fid *fid,
99                                      const struct osd_inode_id *id,
100                                      int ops, bool force,
101                                      enum oi_check_flags flags, bool *exist)
102 {
103         handle_t *th;
104         int       rc;
105         ENTRY;
106
107         if (dev->od_scrub.os_file.sf_param & SP_DRYRUN && !force)
108                 RETURN(0);
109
110         /* DTO_INDEX_INSERT is enough for other two ops:
111          * delete/update, but save stack. */
112         th = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC,
113                                 osd_dto_credits_noquota[DTO_INDEX_INSERT]);
114         if (IS_ERR(th)) {
115                 rc = PTR_ERR(th);
116                 CDEBUG(D_LFSCK, "%s: fail to start trans for scrub op %d "
117                        DFID" => %u/%u: rc = %d\n", osd_name(dev), ops,
118                        PFID(fid), id ? id->oii_ino : -1, id ? id->oii_gen : -1,
119                        rc);
120                 RETURN(rc);
121         }
122
123         switch (ops) {
124         case DTO_INDEX_UPDATE:
125                 rc = osd_oi_update(info, dev, fid, id, th, flags);
126                 if (unlikely(rc == -ENOENT)) {
127                         /* Some unlink thread may removed the OI mapping. */
128                         rc = 1;
129                 }
130                 break;
131         case DTO_INDEX_INSERT:
132                 rc = osd_oi_insert(info, dev, fid, id, th, flags, exist);
133                 if (unlikely(rc == -EEXIST)) {
134                         rc = 1;
135                         /* XXX: There are trouble things when adding OI
136                          *      mapping for IGIF object, which may cause
137                          *      multiple objects to be mapped to the same
138                          *      IGIF formatted FID. Consider the following
139                          *      situations:
140                          *
141                          *      1) The MDT is upgrading from 1.8 device.
142                          *      The OI scrub generates IGIF FID1 for the
143                          *      OBJ1 and adds the OI mapping.
144                          *
145                          *      2) For some reason, the OI scrub does not
146                          *      process all the IGIF objects completely.
147                          *
148                          *      3) The MDT is backuped and restored against
149                          *      this device.
150                          *
151                          *      4) When the MDT mounts up, the OI scrub will
152                          *      try to rebuild the OI files. For some IGIF
153                          *      object, OBJ2, which was not processed by the
154                          *      OI scrub before the backup/restore, and the
155                          *      new generated IGIF formatted FID may be just
156                          *      the FID1, the same as OBJ1.
157                          *
158                          *      Under such case, the OI scrub cannot know how
159                          *      to generate new FID for the OBJ2.
160                          *
161                          *      Currently, we do nothing for that. One possible
162                          *      solution is to generate new normal FID for the
163                          *      conflict object.
164                          *
165                          *      Anyway, it is rare, only exists in theory. */
166                 }
167                 break;
168         case DTO_INDEX_DELETE:
169                 rc = osd_oi_delete(info, dev, fid, th, flags);
170                 if (rc == -ENOENT) {
171                         /* It is normal that the unlink thread has removed the
172                          * OI mapping already. */
173                         rc = 1;
174                 }
175                 break;
176         default:
177                 LASSERTF(0, "Unexpected ops %d\n", ops);
178                 break;
179         }
180
181         ldiskfs_journal_stop(th);
182         if (rc < 0)
183                 CDEBUG(D_LFSCK, "%s: fail to refresh OI map for scrub op %d "
184                        DFID" => %u/%u: rc = %d\n", osd_name(dev), ops,
185                        PFID(fid), id ? id->oii_ino : -1, id ? id->oii_gen : -1,
186                        rc);
187
188         RETURN(rc);
189 }
190
191 /* OI_scrub file ops */
192
193 static void osd_scrub_file_to_cpu(struct scrub_file *des,
194                                   struct scrub_file *src)
195 {
196         memcpy(des->sf_uuid, src->sf_uuid, 16);
197         des->sf_flags   = le64_to_cpu(src->sf_flags);
198         des->sf_magic   = le32_to_cpu(src->sf_magic);
199         des->sf_status  = le16_to_cpu(src->sf_status);
200         des->sf_param   = le16_to_cpu(src->sf_param);
201         des->sf_time_last_complete      =
202                                 le64_to_cpu(src->sf_time_last_complete);
203         des->sf_time_latest_start       =
204                                 le64_to_cpu(src->sf_time_latest_start);
205         des->sf_time_last_checkpoint    =
206                                 le64_to_cpu(src->sf_time_last_checkpoint);
207         des->sf_pos_latest_start        =
208                                 le64_to_cpu(src->sf_pos_latest_start);
209         des->sf_pos_last_checkpoint     =
210                                 le64_to_cpu(src->sf_pos_last_checkpoint);
211         des->sf_pos_first_inconsistent  =
212                                 le64_to_cpu(src->sf_pos_first_inconsistent);
213         des->sf_items_checked           =
214                                 le64_to_cpu(src->sf_items_checked);
215         des->sf_items_updated           =
216                                 le64_to_cpu(src->sf_items_updated);
217         des->sf_items_failed            =
218                                 le64_to_cpu(src->sf_items_failed);
219         des->sf_items_updated_prior     =
220                                 le64_to_cpu(src->sf_items_updated_prior);
221         des->sf_run_time        = le32_to_cpu(src->sf_run_time);
222         des->sf_success_count   = le32_to_cpu(src->sf_success_count);
223         des->sf_oi_count        = le16_to_cpu(src->sf_oi_count);
224         des->sf_internal_flags  = le16_to_cpu(src->sf_internal_flags);
225         memcpy(des->sf_oi_bitmap, src->sf_oi_bitmap, SCRUB_OI_BITMAP_SIZE);
226 }
227
228 static void osd_scrub_file_to_le(struct scrub_file *des,
229                                  struct scrub_file *src)
230 {
231         memcpy(des->sf_uuid, src->sf_uuid, 16);
232         des->sf_flags   = cpu_to_le64(src->sf_flags);
233         des->sf_magic   = cpu_to_le32(src->sf_magic);
234         des->sf_status  = cpu_to_le16(src->sf_status);
235         des->sf_param   = cpu_to_le16(src->sf_param);
236         des->sf_time_last_complete      =
237                                 cpu_to_le64(src->sf_time_last_complete);
238         des->sf_time_latest_start       =
239                                 cpu_to_le64(src->sf_time_latest_start);
240         des->sf_time_last_checkpoint    =
241                                 cpu_to_le64(src->sf_time_last_checkpoint);
242         des->sf_pos_latest_start        =
243                                 cpu_to_le64(src->sf_pos_latest_start);
244         des->sf_pos_last_checkpoint     =
245                                 cpu_to_le64(src->sf_pos_last_checkpoint);
246         des->sf_pos_first_inconsistent  =
247                                 cpu_to_le64(src->sf_pos_first_inconsistent);
248         des->sf_items_checked           =
249                                 cpu_to_le64(src->sf_items_checked);
250         des->sf_items_updated           =
251                                 cpu_to_le64(src->sf_items_updated);
252         des->sf_items_failed            =
253                                 cpu_to_le64(src->sf_items_failed);
254         des->sf_items_updated_prior     =
255                                 cpu_to_le64(src->sf_items_updated_prior);
256         des->sf_run_time        = cpu_to_le32(src->sf_run_time);
257         des->sf_success_count   = cpu_to_le32(src->sf_success_count);
258         des->sf_oi_count        = cpu_to_le16(src->sf_oi_count);
259         des->sf_internal_flags  = cpu_to_le16(src->sf_internal_flags);
260         memcpy(des->sf_oi_bitmap, src->sf_oi_bitmap, SCRUB_OI_BITMAP_SIZE);
261 }
262
263 static void osd_scrub_file_init(struct osd_scrub *scrub, __u8 *uuid)
264 {
265         struct scrub_file *sf = &scrub->os_file;
266
267         memset(sf, 0, sizeof(*sf));
268         memcpy(sf->sf_uuid, uuid, 16);
269         sf->sf_magic = SCRUB_MAGIC_V1;
270         sf->sf_status = SS_INIT;
271 }
272
273 void osd_scrub_file_reset(struct osd_scrub *scrub, __u8 *uuid, __u64 flags)
274 {
275         struct scrub_file *sf = &scrub->os_file;
276
277         CDEBUG(D_LFSCK, "%.16s: reset OI scrub file, old flags = "
278                "%#llx, add flags = %#llx\n",
279                osd_scrub2name(scrub), sf->sf_flags, flags);
280
281         memcpy(sf->sf_uuid, uuid, 16);
282         sf->sf_status = SS_INIT;
283         sf->sf_flags |= flags;
284         sf->sf_flags &= ~SF_AUTO;
285         sf->sf_run_time = 0;
286         sf->sf_time_latest_start = 0;
287         sf->sf_time_last_checkpoint = 0;
288         sf->sf_pos_latest_start = 0;
289         sf->sf_pos_last_checkpoint = 0;
290         sf->sf_pos_first_inconsistent = 0;
291         sf->sf_items_checked = 0;
292         sf->sf_items_updated = 0;
293         sf->sf_items_failed = 0;
294         if (!scrub->os_in_join)
295                 sf->sf_items_updated_prior = 0;
296
297         sf->sf_items_noscrub = 0;
298         sf->sf_items_igif = 0;
299 }
300
301 static int osd_scrub_file_load(struct osd_scrub *scrub)
302 {
303         loff_t  pos  = 0;
304         int     len  = sizeof(scrub->os_file_disk);
305         int     rc;
306
307         rc = osd_ldiskfs_read(scrub->os_inode, &scrub->os_file_disk, len, &pos);
308         if (rc == len) {
309                 struct scrub_file *sf = &scrub->os_file;
310
311                 osd_scrub_file_to_cpu(sf, &scrub->os_file_disk);
312                 if (sf->sf_magic != SCRUB_MAGIC_V1) {
313                         CDEBUG(D_LFSCK, "%.16s: invalid scrub magic "
314                                "0x%x != 0x%x\n", osd_scrub2name(scrub),
315                                sf->sf_magic, SCRUB_MAGIC_V1);
316                         /* Process it as new scrub file. */
317                         rc = -ENOENT;
318                 } else {
319                         rc = 0;
320                 }
321         } else if (rc != 0) {
322                 CDEBUG(D_LFSCK, "%.16s: fail to load scrub file, "
323                        "expected = %d: rc = %d\n",
324                        osd_scrub2name(scrub), len, rc);
325                 if (rc > 0)
326                         rc = -EFAULT;
327         } else {
328                 /* return -ENOENT for empty scrub file case. */
329                 rc = -ENOENT;
330         }
331
332         return rc;
333 }
334
335 int osd_scrub_file_store(struct osd_scrub *scrub)
336 {
337         struct osd_device *dev;
338         handle_t          *jh;
339         loff_t             pos     = 0;
340         int                len     = sizeof(scrub->os_file_disk);
341         int                credits;
342         int                rc;
343
344         dev = container_of0(scrub, struct osd_device, od_scrub);
345         credits = osd_dto_credits_noquota[DTO_WRITE_BASE] +
346                   osd_dto_credits_noquota[DTO_WRITE_BLOCK];
347         jh = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC, credits);
348         if (IS_ERR(jh)) {
349                 rc = PTR_ERR(jh);
350                 CDEBUG(D_LFSCK, "%.16s: fail to start trans for scrub store: "
351                        "rc = %d\n", osd_scrub2name(scrub), rc);
352                 return rc;
353         }
354
355         osd_scrub_file_to_le(&scrub->os_file_disk, &scrub->os_file);
356         rc = osd_ldiskfs_write_record(scrub->os_inode, &scrub->os_file_disk,
357                                       len, 0, &pos, jh);
358         ldiskfs_journal_stop(jh);
359         if (rc != 0)
360                 CDEBUG(D_LFSCK, "%.16s: fail to store scrub file, "
361                        "expected = %d: rc = %d\n",
362                        osd_scrub2name(scrub), len, rc);
363
364         scrub->os_time_last_checkpoint = cfs_time_current();
365         scrub->os_time_next_checkpoint = scrub->os_time_last_checkpoint +
366                                 cfs_time_seconds(SCRUB_CHECKPOINT_INTERVAL);
367         return rc;
368 }
369
370 static int
371 osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
372                      struct inode *inode, const struct lu_fid *fid)
373 {
374         struct filter_fid_old   *ff      = &info->oti_ff;
375         struct dentry           *dentry  = &info->oti_obj_dentry;
376         struct lu_fid           *tfid    = &info->oti_fid;
377         handle_t                *jh;
378         int                      size    = 0;
379         int                      rc;
380         bool                     removed = false;
381         bool                     reset   = true;
382         ENTRY;
383
384         if (dev->od_scrub.os_file.sf_param & SP_DRYRUN)
385                 RETURN(0);
386
387         if (fid_is_idif(fid) && dev->od_index_in_idif == 0) {
388                 struct ost_id *oi = &info->oti_ostid;
389
390                 fid_to_ostid(fid, oi);
391                 ostid_to_fid(tfid, oi, 0);
392         } else {
393                 *tfid = *fid;
394         }
395
396         /* We want the LMA to fit into the 256-byte OST inode, so operate
397          * as following:
398          * 1) read old XATTR_NAME_FID and save the parent FID;
399          * 2) delete the old XATTR_NAME_FID;
400          * 3) make new LMA and add it;
401          * 4) generate new XATTR_NAME_FID with the saved parent FID and add it.
402          *
403          * Making the LMA to fit into the 256-byte OST inode can save time for
404          * normal osd_check_lma() and for other OI scrub scanning in future.
405          * So it is worth to make some slow conversion here. */
406         jh = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC,
407                                 osd_dto_credits_noquota[DTO_XATTR_SET] * 3);
408         if (IS_ERR(jh)) {
409                 rc = PTR_ERR(jh);
410                 CDEBUG(D_LFSCK, "%s: fail to start trans for convert ff "
411                        DFID": rc = %d\n", osd_name(dev), PFID(tfid), rc);
412                 RETURN(rc);
413         }
414
415         /* 1) read old XATTR_NAME_FID and save the parent FID */
416         rc = __osd_xattr_get(inode, dentry, XATTR_NAME_FID, ff, sizeof(*ff));
417         if (rc == sizeof(*ff)) {
418                 /* 2) delete the old XATTR_NAME_FID */
419                 ll_vfs_dq_init(inode);
420                 rc = inode->i_op->removexattr(dentry, XATTR_NAME_FID);
421                 if (rc != 0)
422                         GOTO(stop, rc);
423
424                 removed = true;
425         } else if (unlikely(rc == -ENODATA)) {
426                 reset = false;
427         } else if (rc != sizeof(struct filter_fid)) {
428                 GOTO(stop, rc = -EINVAL);
429         }
430
431         /* 3) make new LMA and add it */
432         rc = osd_ea_fid_set(info, inode, tfid, LMAC_FID_ON_OST, 0);
433         if (rc == 0 && reset)
434                 size = sizeof(struct filter_fid);
435         else if (rc != 0 && removed)
436                 /* If failed, we should try to add the old back. */
437                 size = sizeof(struct filter_fid_old);
438
439         /* 4) generate new XATTR_NAME_FID with the saved parent FID and add it*/
440         if (size > 0) {
441                 int rc1;
442
443                 rc1 = __osd_xattr_set(info, inode, XATTR_NAME_FID, ff, size,
444                                       XATTR_CREATE);
445                 if (rc1 != 0 && rc == 0)
446                         rc = rc1;
447         }
448
449         GOTO(stop, rc);
450
451 stop:
452         ldiskfs_journal_stop(jh);
453         if (rc < 0)
454                 CDEBUG(D_LFSCK, "%s: fail to convert ff "DFID": rc = %d\n",
455                        osd_name(dev), PFID(tfid), rc);
456         return rc;
457 }
458
459 static int
460 osd_scrub_check_update(struct osd_thread_info *info, struct osd_device *dev,
461                        struct osd_idmap_cache *oic, int val)
462 {
463         struct osd_scrub             *scrub  = &dev->od_scrub;
464         struct scrub_file            *sf     = &scrub->os_file;
465         struct lu_fid                *fid    = &oic->oic_fid;
466         struct osd_inode_id          *lid    = &oic->oic_lid;
467         struct osd_inode_id          *lid2   = &info->oti_id;
468         struct osd_inconsistent_item *oii    = NULL;
469         struct inode                 *inode  = NULL;
470         int                           ops    = DTO_INDEX_UPDATE;
471         int                           rc;
472         bool                          converted = false;
473         bool                          exist     = false;
474         ENTRY;
475
476         down_write(&scrub->os_rwsem);
477         scrub->os_new_checked++;
478         if (val < 0)
479                 GOTO(out, rc = val);
480
481         if (scrub->os_in_prior)
482                 oii = list_entry(oic, struct osd_inconsistent_item,
483                                  oii_cache);
484
485         if (lid->oii_ino < sf->sf_pos_latest_start && oii == NULL)
486                 GOTO(out, rc = 0);
487
488         if (fid_is_igif(fid))
489                 sf->sf_items_igif++;
490
491         if (val == SCRUB_NEXT_OSTOBJ_OLD) {
492                 inode = osd_iget(info, dev, lid);
493                 if (IS_ERR(inode)) {
494                         rc = PTR_ERR(inode);
495                         /* Someone removed the inode. */
496                         if (rc == -ENOENT || rc == -ESTALE)
497                                 rc = 0;
498                         GOTO(out, rc);
499                 }
500
501                 /* The inode has been reused as EA inode, ignore it. */
502                 if (unlikely(osd_is_ea_inode(inode)))
503                         GOTO(out, rc = 0);
504
505                 sf->sf_flags |= SF_UPGRADE;
506                 sf->sf_internal_flags &= ~SIF_NO_HANDLE_OLD_FID;
507                 dev->od_check_ff = 1;
508                 rc = osd_scrub_convert_ff(info, dev, inode, fid);
509                 if (rc != 0)
510                         GOTO(out, rc);
511
512                 converted = true;
513         }
514
515         if ((val == SCRUB_NEXT_NOLMA) &&
516             (!scrub->os_convert_igif || OBD_FAIL_CHECK(OBD_FAIL_FID_NOLMA)))
517                 GOTO(out, rc = 0);
518
519         if ((oii != NULL && oii->oii_insert) || (val == SCRUB_NEXT_NOLMA)) {
520                 ops = DTO_INDEX_INSERT;
521
522                 goto iget;
523         }
524
525         rc = osd_oi_lookup(info, dev, fid, lid2,
526                 (val == SCRUB_NEXT_OSTOBJ ||
527                  val == SCRUB_NEXT_OSTOBJ_OLD) ? OI_KNOWN_ON_OST : 0);
528         if (rc != 0) {
529                 if (rc == -ENOENT)
530                         ops = DTO_INDEX_INSERT;
531                 else if (rc != -ESTALE)
532                         GOTO(out, rc);
533
534 iget:
535                 if (inode == NULL) {
536                         inode = osd_iget(info, dev, lid);
537                         if (IS_ERR(inode)) {
538                                 rc = PTR_ERR(inode);
539                                 /* Someone removed the inode. */
540                                 if (rc == -ENOENT || rc == -ESTALE)
541                                         rc = 0;
542                                 GOTO(out, rc);
543                         }
544
545                         /* The inode has been reused as EA inode, ignore it. */
546                         if (unlikely(osd_is_ea_inode(inode)))
547                                 GOTO(out, rc = 0);
548                 }
549
550                 if (!scrub->os_partial_scan)
551                         scrub->os_full_speed = 1;
552
553                 switch (val) {
554                 case SCRUB_NEXT_NOLMA:
555                         sf->sf_flags |= SF_UPGRADE;
556                         if (!(sf->sf_param & SP_DRYRUN)) {
557                                 rc = osd_ea_fid_set(info, inode, fid, 0, 0);
558                                 if (rc != 0)
559                                         GOTO(out, rc);
560                         }
561
562                         if (!(sf->sf_flags & SF_INCONSISTENT))
563                                 dev->od_igif_inoi = 0;
564                         break;
565                 case SCRUB_NEXT_OSTOBJ:
566                         sf->sf_flags |= SF_INCONSISTENT;
567                 case SCRUB_NEXT_OSTOBJ_OLD:
568                         break;
569                 default:
570                         break;
571                 }
572         } else if (osd_id_eq(lid, lid2)) {
573                 if (converted)
574                         sf->sf_items_updated++;
575
576                 GOTO(out, rc = 0);
577         } else {
578                 if (!scrub->os_partial_scan)
579                         scrub->os_full_speed = 1;
580
581                 sf->sf_flags |= SF_INCONSISTENT;
582
583                 /* XXX: If the device is restored from file-level backup, then
584                  *      some IGIFs may have been already in OI files, and some
585                  *      may be not yet. Means upgrading from 1.8 may be partly
586                  *      processed, but some clients may hold some immobilized
587                  *      IGIFs, and use them to access related objects. Under
588                  *      such case, OSD does not know whether an given IGIF has
589                  *      been processed or to be processed, and it also cannot
590                  *      generate local ino#/gen# directly from the immobilized
591                  *      IGIF because of the backup/restore. Then force OSD to
592                  *      lookup the given IGIF in OI files, and if no entry,
593                  *      then ask the client to retry after upgrading completed.
594                  *      No better choice. */
595                 dev->od_igif_inoi = 1;
596         }
597
598         rc = osd_scrub_refresh_mapping(info, dev, fid, lid, ops, false,
599                         (val == SCRUB_NEXT_OSTOBJ ||
600                          val == SCRUB_NEXT_OSTOBJ_OLD) ? OI_KNOWN_ON_OST : 0,
601                         &exist);
602         if (rc == 0) {
603                 if (scrub->os_in_prior)
604                         sf->sf_items_updated_prior++;
605                 else
606                         sf->sf_items_updated++;
607
608                 if (ops == DTO_INDEX_INSERT && val == 0 && !exist) {
609                         int idx = osd_oi_fid2idx(dev, fid);
610
611                         sf->sf_flags |= SF_RECREATED;
612                         if (unlikely(!ldiskfs_test_bit(idx, sf->sf_oi_bitmap)))
613                                 ldiskfs_set_bit(idx, sf->sf_oi_bitmap);
614                 }
615         }
616
617         GOTO(out, rc);
618
619 out:
620         if (rc < 0) {
621                 sf->sf_items_failed++;
622                 if (sf->sf_pos_first_inconsistent == 0 ||
623                     sf->sf_pos_first_inconsistent > lid->oii_ino)
624                         sf->sf_pos_first_inconsistent = lid->oii_ino;
625         } else {
626                 rc = 0;
627         }
628
629         /* There may be conflict unlink during the OI scrub,
630          * if happend, then remove the new added OI mapping. */
631         if (ops == DTO_INDEX_INSERT && inode != NULL && !IS_ERR(inode) &&
632             unlikely(ldiskfs_test_inode_state(inode,
633                                               LDISKFS_STATE_LUSTRE_DESTROY)))
634                 osd_scrub_refresh_mapping(info, dev, fid, lid,
635                                 DTO_INDEX_DELETE, false,
636                                 (val == SCRUB_NEXT_OSTOBJ ||
637                                  val == SCRUB_NEXT_OSTOBJ_OLD) ?
638                                 OI_KNOWN_ON_OST : 0, NULL);
639         up_write(&scrub->os_rwsem);
640
641         if (inode != NULL && !IS_ERR(inode))
642                 iput(inode);
643
644         if (oii != NULL) {
645                 spin_lock(&scrub->os_lock);
646                 if (likely(!list_empty(&oii->oii_list)))
647                         list_del(&oii->oii_list);
648                 spin_unlock(&scrub->os_lock);
649
650                 OBD_FREE_PTR(oii);
651         }
652
653         RETURN(sf->sf_param & SP_FAILOUT ? rc : 0);
654 }
655
656 /* OI scrub APIs */
657
658 static int osd_scrub_prep(struct osd_device *dev)
659 {
660         struct osd_scrub     *scrub  = &dev->od_scrub;
661         struct ptlrpc_thread *thread = &scrub->os_thread;
662         struct scrub_file    *sf     = &scrub->os_file;
663         __u32                 flags  = scrub->os_start_flags;
664         int                   rc;
665         bool                  drop_dryrun = false;
666         ENTRY;
667
668         CDEBUG(D_LFSCK, "%.16s: OI scrub prep, flags = 0x%x\n",
669                osd_scrub2name(scrub), flags);
670
671         down_write(&scrub->os_rwsem);
672         if (flags & SS_SET_FAILOUT)
673                 sf->sf_param |= SP_FAILOUT;
674         else if (flags & SS_CLEAR_FAILOUT)
675                 sf->sf_param &= ~SP_FAILOUT;
676
677         if (flags & SS_SET_DRYRUN) {
678                 sf->sf_param |= SP_DRYRUN;
679         } else if (flags & SS_CLEAR_DRYRUN && sf->sf_param & SP_DRYRUN) {
680                 sf->sf_param &= ~SP_DRYRUN;
681                 drop_dryrun = true;
682         }
683
684         if (flags & SS_RESET)
685                 osd_scrub_file_reset(scrub,
686                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid, 0);
687
688         if (flags & SS_AUTO_FULL) {
689                 scrub->os_full_speed = 1;
690                 scrub->os_partial_scan = 0;
691                 sf->sf_flags |= SF_AUTO;
692         } else if (flags & SS_AUTO_PARTIAL) {
693                 scrub->os_full_speed = 0;
694                 scrub->os_partial_scan = 1;
695                 sf->sf_flags |= SF_AUTO;
696         } else if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
697                                    SF_UPGRADE)) {
698                 scrub->os_full_speed = 1;
699                 scrub->os_partial_scan = 0;
700         } else {
701                 scrub->os_full_speed = 0;
702                 scrub->os_partial_scan = 0;
703         }
704
705         spin_lock(&scrub->os_lock);
706         scrub->os_in_prior = 0;
707         scrub->os_waiting = 0;
708         scrub->os_paused = 0;
709         scrub->os_in_join = 0;
710         scrub->os_full_scrub = 0;
711         spin_unlock(&scrub->os_lock);
712         scrub->os_new_checked = 0;
713         if (drop_dryrun && sf->sf_pos_first_inconsistent != 0)
714                 sf->sf_pos_latest_start = sf->sf_pos_first_inconsistent;
715         else if (sf->sf_pos_last_checkpoint != 0)
716                 sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
717         else
718                 sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
719
720         scrub->os_pos_current = sf->sf_pos_latest_start;
721         sf->sf_status = SS_SCANNING;
722         sf->sf_time_latest_start = cfs_time_current_sec();
723         sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
724         sf->sf_pos_last_checkpoint = sf->sf_pos_latest_start - 1;
725         rc = osd_scrub_file_store(scrub);
726         if (rc == 0) {
727                 spin_lock(&scrub->os_lock);
728                 thread_set_flags(thread, SVC_RUNNING);
729                 spin_unlock(&scrub->os_lock);
730                 wake_up_all(&thread->t_ctl_waitq);
731         }
732         up_write(&scrub->os_rwsem);
733
734         RETURN(rc);
735 }
736
737 static int osd_scrub_checkpoint(struct osd_scrub *scrub)
738 {
739         struct scrub_file *sf = &scrub->os_file;
740         int                rc;
741
742         if (likely(cfs_time_before(cfs_time_current(),
743                                    scrub->os_time_next_checkpoint) ||
744                    scrub->os_new_checked == 0))
745                 return 0;
746
747         down_write(&scrub->os_rwsem);
748         sf->sf_items_checked += scrub->os_new_checked;
749         scrub->os_new_checked = 0;
750         sf->sf_pos_last_checkpoint = scrub->os_pos_current;
751         sf->sf_time_last_checkpoint = cfs_time_current_sec();
752         sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
753                                             scrub->os_time_last_checkpoint);
754         rc = osd_scrub_file_store(scrub);
755         up_write(&scrub->os_rwsem);
756
757         return rc;
758 }
759
760 static int osd_scrub_post(struct osd_scrub *scrub, int result)
761 {
762         struct scrub_file *sf = &scrub->os_file;
763         int rc;
764         ENTRY;
765
766         CDEBUG(D_LFSCK, "%.16s: OI scrub post, result = %d\n",
767                osd_scrub2name(scrub), result);
768
769         down_write(&scrub->os_rwsem);
770         spin_lock(&scrub->os_lock);
771         thread_set_flags(&scrub->os_thread, SVC_STOPPING);
772         spin_unlock(&scrub->os_lock);
773         if (scrub->os_new_checked > 0) {
774                 sf->sf_items_checked += scrub->os_new_checked;
775                 scrub->os_new_checked = 0;
776                 sf->sf_pos_last_checkpoint = scrub->os_pos_current;
777         }
778         sf->sf_time_last_checkpoint = cfs_time_current_sec();
779         if (result > 0) {
780                 struct osd_device *dev =
781                         container_of0(scrub, struct osd_device, od_scrub);
782
783                 dev->od_igif_inoi = 1;
784                 dev->od_check_ff = 0;
785                 sf->sf_status = SS_COMPLETED;
786                 if (!(sf->sf_param & SP_DRYRUN)) {
787                         memset(sf->sf_oi_bitmap, 0, SCRUB_OI_BITMAP_SIZE);
788                         sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
789                                           SF_UPGRADE | SF_AUTO);
790                 }
791                 sf->sf_time_last_complete = sf->sf_time_last_checkpoint;
792                 sf->sf_success_count++;
793         } else if (result == 0) {
794                 if (scrub->os_paused)
795                         sf->sf_status = SS_PAUSED;
796                 else
797                         sf->sf_status = SS_STOPPED;
798         } else {
799                 sf->sf_status = SS_FAILED;
800         }
801         sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
802                                             scrub->os_time_last_checkpoint);
803         rc = osd_scrub_file_store(scrub);
804         up_write(&scrub->os_rwsem);
805
806         RETURN(rc < 0 ? rc : result);
807 }
808
809 /* iteration engine */
810
811 struct osd_iit_param {
812         struct super_block *sb;
813         struct buffer_head *bitmap;
814         ldiskfs_group_t bg;
815         __u32 gbase;
816         __u32 offset;
817 };
818
819 typedef int (*osd_iit_next_policy)(struct osd_thread_info *info,
820                                    struct osd_device *dev,
821                                    struct osd_iit_param *param,
822                                    struct osd_idmap_cache **oic,
823                                    const bool noslot);
824
825 typedef int (*osd_iit_exec_policy)(struct osd_thread_info *info,
826                                    struct osd_device *dev,
827                                    struct osd_iit_param *param,
828                                    struct osd_idmap_cache *oic,
829                                    bool *noslot, int rc);
830
831 static int osd_iit_next(struct osd_iit_param *param, __u32 *pos)
832 {
833         param->offset = ldiskfs_find_next_bit(param->bitmap->b_data,
834                         LDISKFS_INODES_PER_GROUP(param->sb), param->offset);
835         if (param->offset >= LDISKFS_INODES_PER_GROUP(param->sb)) {
836                 *pos = 1 + (param->bg+1) * LDISKFS_INODES_PER_GROUP(param->sb);
837                 return SCRUB_NEXT_BREAK;
838         } else {
839                 *pos = param->gbase + param->offset;
840                 return 0;
841         }
842 }
843
844 /**
845  * \retval SCRUB_NEXT_OSTOBJ_OLD: FID-on-OST
846  * \retval 0: FID-on-MDT
847  */
848 static int osd_scrub_check_local_fldb(struct osd_thread_info *info,
849                                       struct osd_device *dev,
850                                       struct lu_fid *fid)
851 {
852         /* XXX: The initial OI scrub will scan the top level /O to generate
853          *      a small local FLDB according to the <seq>. If the given FID
854          *      is in the local FLDB, then it is FID-on-OST; otherwise it's
855          *      quite possible for FID-on-MDT. */
856         if (dev->od_is_ost)
857                 return SCRUB_NEXT_OSTOBJ_OLD;
858         else
859                 return 0;
860 }
861
862 static int osd_scrub_get_fid(struct osd_thread_info *info,
863                              struct osd_device *dev, struct inode *inode,
864                              struct lu_fid *fid, bool scrub)
865 {
866         struct lustre_mdt_attrs *lma     = &info->oti_mdt_attrs;
867         int                      rc;
868         bool                     has_lma = false;
869
870         rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
871         if (rc == 0) {
872                 has_lma = true;
873                 if (lma->lma_compat & LMAC_NOT_IN_OI ||
874                     lma->lma_incompat & LMAI_AGENT)
875                         return SCRUB_NEXT_CONTINUE;
876
877                 *fid = lma->lma_self_fid;
878                 if (!scrub)
879                         return 0;
880
881                 if (lma->lma_compat & LMAC_FID_ON_OST)
882                         return SCRUB_NEXT_OSTOBJ;
883
884                 if (fid_is_idif(fid))
885                         return SCRUB_NEXT_OSTOBJ_OLD;
886
887                 /* For local object. */
888                 if (fid_is_internal(fid))
889                         return 0;
890
891                 /* For external visible MDT-object with non-normal FID. */
892                 if (fid_is_namespace_visible(fid) && !fid_is_norm(fid))
893                         return 0;
894
895                 /* For the object with normal FID, it may be MDT-object,
896                  * or may be 2.4 OST-object, need further distinguish.
897                  * Fall through to next section. */
898         }
899
900         if (rc == -ENODATA || rc == 0) {
901                 rc = osd_get_idif(info, inode, &info->oti_obj_dentry, fid);
902                 if (rc == 0) {
903                         if (scrub)
904                                 /* It is old 2.x (x <= 3) or 1.8 OST-object. */
905                                 rc = SCRUB_NEXT_OSTOBJ_OLD;
906                         return rc;
907                 }
908
909                 if (rc > 0) {
910                         if (!has_lma)
911                                 /* It is FID-on-OST, but we do not know how
912                                  * to generate its FID, ignore it directly. */
913                                 rc = SCRUB_NEXT_CONTINUE;
914                         else
915                                 /* It is 2.4 OST-object. */
916                                 rc = SCRUB_NEXT_OSTOBJ_OLD;
917                         return rc;
918                 }
919
920                 if (rc != -ENODATA)
921                         return rc;
922
923                 if (!has_lma) {
924                         if (dev->od_scrub.os_convert_igif) {
925                                 lu_igif_build(fid, inode->i_ino,
926                                               inode->i_generation);
927                                 if (scrub)
928                                         rc = SCRUB_NEXT_NOLMA;
929                                 else
930                                         rc = 0;
931                         } else {
932                                 /* It may be FID-on-OST, or may be FID for
933                                  * non-MDT0, anyway, we do not know how to
934                                  * generate its FID, ignore it directly. */
935                                 rc = SCRUB_NEXT_CONTINUE;
936                         }
937                         return rc;
938                 }
939
940                 /* For OI scrub case only: the object has LMA but has no ff
941                  * (or ff crashed). It may be MDT-object, may be OST-object
942                  * with crashed ff. The last check is local FLDB. */
943                 rc = osd_scrub_check_local_fldb(info, dev, fid);
944         }
945
946         return rc;
947 }
948
949 static int osd_iit_iget(struct osd_thread_info *info, struct osd_device *dev,
950                         struct lu_fid *fid, struct osd_inode_id *lid, __u32 pos,
951                         struct super_block *sb, bool scrub)
952 {
953         struct inode *inode;
954         int           rc;
955         ENTRY;
956
957         /* Not handle the backend root object and agent parent object.
958          * They are neither visible to namespace nor have OI mappings. */
959         if (unlikely(pos == osd_sb(dev)->s_root->d_inode->i_ino ||
960                      pos == osd_remote_parent_ino(dev)))
961                 RETURN(SCRUB_NEXT_CONTINUE);
962
963         osd_id_gen(lid, pos, OSD_OII_NOGEN);
964         inode = osd_iget(info, dev, lid);
965         if (IS_ERR(inode)) {
966                 rc = PTR_ERR(inode);
967                 /* The inode may be removed after bitmap searching, or the
968                  * file is new created without inode initialized yet. */
969                 if (rc == -ENOENT || rc == -ESTALE)
970                         RETURN(SCRUB_NEXT_CONTINUE);
971
972                 CDEBUG(D_LFSCK, "%.16s: fail to read inode, ino# = %u: "
973                        "rc = %d\n", LDISKFS_SB(sb)->s_es->s_volume_name,
974                        pos, rc);
975                 RETURN(rc);
976         }
977
978         /* It is an EA inode, no OI mapping for it, skip it. */
979         if (osd_is_ea_inode(inode))
980                 GOTO(put, rc = SCRUB_NEXT_CONTINUE);
981
982         if (scrub &&
983             ldiskfs_test_inode_state(inode, LDISKFS_STATE_LUSTRE_NOSCRUB)) {
984                 /* Only skip it for the first OI scrub accessing. */
985                 ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_NOSCRUB);
986                 GOTO(put, rc = SCRUB_NEXT_NOSCRUB);
987         }
988
989         rc = osd_scrub_get_fid(info, dev, inode, fid, scrub);
990
991         GOTO(put, rc);
992
993 put:
994         iput(inode);
995         return rc;
996 }
997
998 static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
999                           struct osd_iit_param *param,
1000                           struct osd_idmap_cache **oic, const bool noslot)
1001 {
1002         struct osd_scrub     *scrub  = &dev->od_scrub;
1003         struct ptlrpc_thread *thread = &scrub->os_thread;
1004         struct lu_fid        *fid;
1005         struct osd_inode_id  *lid;
1006         int                   rc;
1007
1008         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_DELAY) && cfs_fail_val > 0) {
1009                 struct l_wait_info lwi;
1010
1011                 lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val), NULL, NULL);
1012                 if (likely(lwi.lwi_timeout > 0))
1013                         l_wait_event(thread->t_ctl_waitq,
1014                                 !list_empty(&scrub->os_inconsistent_items) ||
1015                                 !thread_is_running(thread),
1016                                 &lwi);
1017         }
1018
1019         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_CRASH)) {
1020                 spin_lock(&scrub->os_lock);
1021                 thread_set_flags(thread, SVC_STOPPING);
1022                 spin_unlock(&scrub->os_lock);
1023                 return SCRUB_NEXT_CRASH;
1024         }
1025
1026         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_FATAL))
1027                 return SCRUB_NEXT_FATAL;
1028
1029         if (unlikely(!thread_is_running(thread)))
1030                 return SCRUB_NEXT_EXIT;
1031
1032         if (!list_empty(&scrub->os_inconsistent_items)) {
1033                 spin_lock(&scrub->os_lock);
1034                 if (likely(!list_empty(&scrub->os_inconsistent_items))) {
1035                         struct osd_inconsistent_item *oii;
1036
1037                         oii = list_entry(scrub->os_inconsistent_items.next,
1038                                 struct osd_inconsistent_item, oii_list);
1039                         spin_unlock(&scrub->os_lock);
1040
1041                         *oic = &oii->oii_cache;
1042                         scrub->os_in_prior = 1;
1043
1044                         return 0;
1045                 }
1046                 spin_unlock(&scrub->os_lock);
1047         }
1048
1049         if (noslot)
1050                 return SCRUB_NEXT_WAIT;
1051
1052         rc = osd_iit_next(param, &scrub->os_pos_current);
1053         if (rc != 0)
1054                 return rc;
1055
1056         *oic = &scrub->os_oic;
1057         fid = &(*oic)->oic_fid;
1058         lid = &(*oic)->oic_lid;
1059         rc = osd_iit_iget(info, dev, fid, lid,
1060                           scrub->os_pos_current, param->sb, true);
1061         return rc;
1062 }
1063
1064 static int osd_preload_next(struct osd_thread_info *info,
1065                             struct osd_device *dev, struct osd_iit_param *param,
1066                             struct osd_idmap_cache **oic, const bool noslot)
1067 {
1068         struct osd_otable_cache *ooc    = &dev->od_otable_it->ooi_cache;
1069         struct osd_scrub        *scrub;
1070         struct ptlrpc_thread    *thread;
1071         int                      rc;
1072
1073         rc = osd_iit_next(param, &ooc->ooc_pos_preload);
1074         if (rc != 0)
1075                 return rc;
1076
1077         scrub = &dev->od_scrub;
1078         thread = &scrub->os_thread;
1079         if (thread_is_running(thread) &&
1080             ooc->ooc_pos_preload >= scrub->os_pos_current)
1081                 return SCRUB_NEXT_EXIT;
1082
1083         rc = osd_iit_iget(info, dev,
1084                           &ooc->ooc_cache[ooc->ooc_producer_idx].oic_fid,
1085                           &ooc->ooc_cache[ooc->ooc_producer_idx].oic_lid,
1086                           ooc->ooc_pos_preload, param->sb, false);
1087         /* If succeed, it needs to move forward; otherwise up layer LFSCK may
1088          * ignore the failure, so it still need to skip the inode next time. */
1089         ooc->ooc_pos_preload = param->gbase + ++(param->offset);
1090         return rc;
1091 }
1092
1093 static inline int
1094 osd_scrub_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
1095 {
1096         spin_lock(&scrub->os_lock);
1097         if (osd_scrub_has_window(scrub, &it->ooi_cache) ||
1098             !list_empty(&scrub->os_inconsistent_items) ||
1099             it->ooi_waiting || !thread_is_running(&scrub->os_thread))
1100                 scrub->os_waiting = 0;
1101         else
1102                 scrub->os_waiting = 1;
1103         spin_unlock(&scrub->os_lock);
1104
1105         return !scrub->os_waiting;
1106 }
1107
1108 static int osd_scrub_exec(struct osd_thread_info *info, struct osd_device *dev,
1109                           struct osd_iit_param *param,
1110                           struct osd_idmap_cache *oic, bool *noslot, int rc)
1111 {
1112         struct l_wait_info       lwi    = { 0 };
1113         struct osd_scrub        *scrub  = &dev->od_scrub;
1114         struct scrub_file       *sf     = &scrub->os_file;
1115         struct ptlrpc_thread    *thread = &scrub->os_thread;
1116         struct osd_otable_it    *it     = dev->od_otable_it;
1117         struct osd_otable_cache *ooc    = it ? &it->ooi_cache : NULL;
1118
1119         switch (rc) {
1120         case SCRUB_NEXT_CONTINUE:
1121                 goto next;
1122         case SCRUB_NEXT_WAIT:
1123                 goto wait;
1124         case SCRUB_NEXT_NOSCRUB:
1125                 down_write(&scrub->os_rwsem);
1126                 scrub->os_new_checked++;
1127                 sf->sf_items_noscrub++;
1128                 up_write(&scrub->os_rwsem);
1129                 goto next;
1130         }
1131
1132         rc = osd_scrub_check_update(info, dev, oic, rc);
1133         if (rc != 0) {
1134                 scrub->os_in_prior = 0;
1135                 return rc;
1136         }
1137
1138         rc = osd_scrub_checkpoint(scrub);
1139         if (rc != 0) {
1140                 CDEBUG(D_LFSCK, "%.16s: fail to checkpoint, pos = %u: "
1141                        "rc = %d\n", osd_scrub2name(scrub),
1142                        scrub->os_pos_current, rc);
1143                 /* Continue, as long as the scrub itself can go ahead. */
1144         }
1145
1146         if (scrub->os_in_prior) {
1147                 scrub->os_in_prior = 0;
1148                 return 0;
1149         }
1150
1151 next:
1152         scrub->os_pos_current = param->gbase + ++(param->offset);
1153
1154 wait:
1155         if (it != NULL && it->ooi_waiting && ooc != NULL &&
1156             ooc->ooc_pos_preload < scrub->os_pos_current) {
1157                 spin_lock(&scrub->os_lock);
1158                 it->ooi_waiting = 0;
1159                 wake_up_all(&thread->t_ctl_waitq);
1160                 spin_unlock(&scrub->os_lock);
1161         }
1162
1163         if (scrub->os_full_speed || rc == SCRUB_NEXT_CONTINUE)
1164                 return 0;
1165
1166         if (ooc != NULL && osd_scrub_has_window(scrub, ooc)) {
1167                 *noslot = false;
1168                 return 0;
1169         }
1170
1171         if (it != NULL)
1172                 l_wait_event(thread->t_ctl_waitq, osd_scrub_wakeup(scrub, it),
1173                              &lwi);
1174
1175         if (ooc != NULL && osd_scrub_has_window(scrub, ooc))
1176                 *noslot = false;
1177         else
1178                 *noslot = true;
1179         return 0;
1180 }
1181
1182 static int osd_preload_exec(struct osd_thread_info *info,
1183                             struct osd_device *dev, struct osd_iit_param *param,
1184                             struct osd_idmap_cache *oic, bool *noslot, int rc)
1185 {
1186         struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
1187
1188         if (rc == 0) {
1189                 ooc->ooc_cached_items++;
1190                 ooc->ooc_producer_idx = (ooc->ooc_producer_idx + 1) &
1191                                         ~OSD_OTABLE_IT_CACHE_MASK;
1192         }
1193         return rc > 0 ? 0 : rc;
1194 }
1195
1196 #define SCRUB_IT_ALL    1
1197 #define SCRUB_IT_CRASH  2
1198
1199 static void osd_scrub_join(struct osd_device *dev, __u32 flags,
1200                            bool inconsistent)
1201 {
1202         struct osd_scrub     *scrub  = &dev->od_scrub;
1203         struct ptlrpc_thread *thread = &scrub->os_thread;
1204         struct scrub_file    *sf     = &scrub->os_file;
1205         int                   rc;
1206         ENTRY;
1207
1208         LASSERT(!(flags & SS_AUTO_PARTIAL));
1209
1210         down_write(&scrub->os_rwsem);
1211         scrub->os_in_join = 1;
1212         if (flags & SS_SET_FAILOUT)
1213                 sf->sf_param |= SP_FAILOUT;
1214         else if (flags & SS_CLEAR_FAILOUT)
1215                 sf->sf_param &= ~SP_FAILOUT;
1216
1217         if (flags & SS_SET_DRYRUN)
1218                 sf->sf_param |= SP_DRYRUN;
1219         else if (flags & SS_CLEAR_DRYRUN)
1220                 sf->sf_param &= ~SP_DRYRUN;
1221
1222         if (flags & SS_RESET) {
1223                 osd_scrub_file_reset(scrub,
1224                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
1225                         inconsistent ? SF_INCONSISTENT : 0);
1226                 sf->sf_status = SS_SCANNING;
1227         }
1228
1229         if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT | SF_UPGRADE))
1230                 scrub->os_full_speed = 1;
1231         else
1232                 scrub->os_full_speed = 0;
1233
1234         if (flags & SS_AUTO_FULL) {
1235                 sf->sf_flags |= SF_AUTO;
1236                 scrub->os_full_speed = 1;
1237         }
1238
1239         scrub->os_new_checked = 0;
1240         if (sf->sf_pos_last_checkpoint != 0)
1241                 sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
1242         else
1243                 sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
1244
1245         scrub->os_pos_current = sf->sf_pos_latest_start;
1246         sf->sf_time_latest_start = cfs_time_current_sec();
1247         sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
1248         sf->sf_pos_last_checkpoint = sf->sf_pos_latest_start - 1;
1249         rc = osd_scrub_file_store(scrub);
1250         if (rc != 0)
1251                 CDEBUG(D_LFSCK, "%.16s: fail to store scrub file when join "
1252                        "the OI scrub: rc = %d\n", osd_scrub2name(scrub), rc);
1253
1254         spin_lock(&scrub->os_lock);
1255         scrub->os_waiting = 0;
1256         scrub->os_paused = 0;
1257         scrub->os_partial_scan = 0;
1258         scrub->os_in_join = 0;
1259         scrub->os_full_scrub = 0;
1260         spin_unlock(&scrub->os_lock);
1261         wake_up_all(&thread->t_ctl_waitq);
1262         up_write(&scrub->os_rwsem);
1263
1264         EXIT;
1265 }
1266
1267 static int osd_inode_iteration(struct osd_thread_info *info,
1268                                struct osd_device *dev, __u32 max, bool preload)
1269 {
1270         struct osd_scrub     *scrub  = &dev->od_scrub;
1271         struct ptlrpc_thread *thread = &scrub->os_thread;
1272         struct scrub_file    *sf     = &scrub->os_file;
1273         osd_iit_next_policy   next;
1274         osd_iit_exec_policy   exec;
1275         __u32                *pos;
1276         __u32                *count;
1277         struct osd_iit_param  param  = { NULL };
1278         struct l_wait_info    lwi    = { 0 };
1279         __u32                 limit;
1280         int                   rc;
1281         bool                  noslot = true;
1282         ENTRY;
1283
1284         param.sb = osd_sb(dev);
1285         if (preload)
1286                 goto full;
1287
1288         while (scrub->os_partial_scan && !scrub->os_in_join) {
1289                 struct osd_idmap_cache *oic = NULL;
1290
1291                 rc = osd_scrub_next(info, dev, &param, &oic, noslot);
1292                 switch (rc) {
1293                 case SCRUB_NEXT_EXIT:
1294                         RETURN(0);
1295                 case SCRUB_NEXT_CRASH:
1296                         RETURN(SCRUB_IT_CRASH);
1297                 case SCRUB_NEXT_FATAL:
1298                         RETURN(-EINVAL);
1299                 case SCRUB_NEXT_WAIT: {
1300                         struct kstatfs *ksfs = &info->oti_ksfs;
1301                         __u64 saved_flags;
1302
1303                         if (dev->od_full_scrub_ratio == OFSR_NEVER ||
1304                             unlikely(sf->sf_items_updated_prior == 0))
1305                                 goto wait;
1306
1307                         if (dev->od_full_scrub_ratio == OFSR_DIRECTLY ||
1308                             scrub->os_full_scrub) {
1309                                 osd_scrub_join(dev, SS_AUTO_FULL | SS_RESET,
1310                                                true);
1311                                 goto full;
1312                         }
1313
1314                         rc = param.sb->s_op->statfs(param.sb->s_root, ksfs);
1315                         if (rc == 0) {
1316                                 __u64 used = ksfs->f_files - ksfs->f_ffree;
1317
1318                                 do_div(used, sf->sf_items_updated_prior);
1319                                 /* If we hit too much inconsistent OI
1320                                  * mappings during the partial scan,
1321                                  * then scan the device completely. */
1322                                 if (used < dev->od_full_scrub_ratio) {
1323                                         osd_scrub_join(dev,
1324                                                 SS_AUTO_FULL | SS_RESET, true);
1325                                         goto full;
1326                                 }
1327                         }
1328
1329 wait:
1330                         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_DELAY) &&
1331                             cfs_fail_val > 0)
1332                                 continue;
1333
1334                         saved_flags = sf->sf_flags;
1335                         sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
1336                                           SF_UPGRADE | SF_AUTO);
1337                         sf->sf_status = SS_COMPLETED;
1338                         l_wait_event(thread->t_ctl_waitq,
1339                                      !thread_is_running(thread) ||
1340                                      !scrub->os_partial_scan ||
1341                                      scrub->os_in_join ||
1342                                      !list_empty(&scrub->os_inconsistent_items),
1343                                      &lwi);
1344                         sf->sf_flags = saved_flags;
1345                         sf->sf_status = SS_SCANNING;
1346
1347                         if (unlikely(!thread_is_running(thread)))
1348                                 RETURN(0);
1349
1350                         if (!scrub->os_partial_scan || scrub->os_in_join)
1351                                 goto full;
1352
1353                         continue;
1354                 }
1355                 default:
1356                         LASSERTF(rc == 0, "rc = %d\n", rc);
1357
1358                         osd_scrub_exec(info, dev, &param, oic, &noslot, rc);
1359                         break;
1360                 }
1361         }
1362
1363 full:
1364         if (!preload) {
1365                 l_wait_event(thread->t_ctl_waitq,
1366                              !thread_is_running(thread) || !scrub->os_in_join,
1367                              &lwi);
1368
1369                 if (unlikely(!thread_is_running(thread)))
1370                         RETURN(0);
1371         }
1372
1373         noslot = false;
1374         if (!preload) {
1375                 next = osd_scrub_next;
1376                 exec = osd_scrub_exec;
1377                 pos = &scrub->os_pos_current;
1378                 count = &scrub->os_new_checked;
1379         } else {
1380                 struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
1381
1382                 next = osd_preload_next;
1383                 exec = osd_preload_exec;
1384                 pos = &ooc->ooc_pos_preload;
1385                 count = &ooc->ooc_cached_items;
1386         }
1387         limit = le32_to_cpu(LDISKFS_SB(param.sb)->s_es->s_inodes_count);
1388
1389         while (*pos <= limit && *count < max) {
1390                 struct osd_idmap_cache *oic = NULL;
1391                 struct ldiskfs_group_desc *desc;
1392
1393                 param.bg = (*pos - 1) / LDISKFS_INODES_PER_GROUP(param.sb);
1394                 desc = ldiskfs_get_group_desc(param.sb, param.bg, NULL);
1395                 if (desc == NULL)
1396                         RETURN(-EIO);
1397
1398                 ldiskfs_lock_group(param.sb, param.bg);
1399                 if (desc->bg_flags & cpu_to_le16(LDISKFS_BG_INODE_UNINIT)) {
1400                         ldiskfs_unlock_group(param.sb, param.bg);
1401                         *pos = 1 + (param.bg + 1) *
1402                                 LDISKFS_INODES_PER_GROUP(param.sb);
1403                         continue;
1404                 }
1405                 ldiskfs_unlock_group(param.sb, param.bg);
1406
1407                 param.offset = (*pos - 1) % LDISKFS_INODES_PER_GROUP(param.sb);
1408                 param.gbase = 1 + param.bg * LDISKFS_INODES_PER_GROUP(param.sb);
1409                 param.bitmap = ldiskfs_read_inode_bitmap(param.sb, param.bg);
1410                 if (param.bitmap == NULL) {
1411                         CDEBUG(D_LFSCK, "%.16s: fail to read bitmap for %u, "
1412                                "scrub will stop, urgent mode\n",
1413                                osd_scrub2name(scrub), (__u32)param.bg);
1414                         RETURN(-EIO);
1415                 }
1416
1417                 while (param.offset < LDISKFS_INODES_PER_GROUP(param.sb) &&
1418                        *count < max) {
1419                         if (param.offset +
1420                                 ldiskfs_itable_unused_count(param.sb, desc) >
1421                             LDISKFS_INODES_PER_GROUP(param.sb)) {
1422                                 *pos = 1 + (param.bg + 1) *
1423                                         LDISKFS_INODES_PER_GROUP(param.sb);
1424                                 goto next_group;
1425                         }
1426
1427                         rc = next(info, dev, &param, &oic, noslot);
1428                         switch (rc) {
1429                         case SCRUB_NEXT_BREAK:
1430                                 goto next_group;
1431                         case SCRUB_NEXT_EXIT:
1432                                 brelse(param.bitmap);
1433                                 RETURN(0);
1434                         case SCRUB_NEXT_CRASH:
1435                                 brelse(param.bitmap);
1436                                 RETURN(SCRUB_IT_CRASH);
1437                         case SCRUB_NEXT_FATAL:
1438                                 brelse(param.bitmap);
1439                                 RETURN(-EINVAL);
1440                         }
1441
1442                         rc = exec(info, dev, &param, oic, &noslot, rc);
1443                         if (rc != 0) {
1444                                 brelse(param.bitmap);
1445                                 RETURN(rc);
1446                         }
1447                 }
1448
1449 next_group:
1450                 brelse(param.bitmap);
1451         }
1452
1453         if (*pos > limit)
1454                 RETURN(SCRUB_IT_ALL);
1455         RETURN(0);
1456 }
1457
1458 static int osd_otable_it_preload(const struct lu_env *env,
1459                                  struct osd_otable_it *it)
1460 {
1461         struct osd_device       *dev   = it->ooi_dev;
1462         struct osd_scrub        *scrub = &dev->od_scrub;
1463         struct osd_otable_cache *ooc   = &it->ooi_cache;
1464         int                      rc;
1465         ENTRY;
1466
1467         rc = osd_inode_iteration(osd_oti_get(env), dev,
1468                                  OSD_OTABLE_IT_CACHE_SIZE, true);
1469         if (rc == SCRUB_IT_ALL)
1470                 it->ooi_all_cached = 1;
1471
1472         if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
1473                 spin_lock(&scrub->os_lock);
1474                 scrub->os_waiting = 0;
1475                 wake_up_all(&scrub->os_thread.t_ctl_waitq);
1476                 spin_unlock(&scrub->os_lock);
1477         }
1478
1479         RETURN(rc < 0 ? rc : ooc->ooc_cached_items);
1480 }
1481
1482 static int osd_scrub_main(void *args)
1483 {
1484         struct lu_env         env;
1485         struct osd_device    *dev    = (struct osd_device *)args;
1486         struct osd_scrub     *scrub  = &dev->od_scrub;
1487         struct ptlrpc_thread *thread = &scrub->os_thread;
1488         int                   rc;
1489         ENTRY;
1490
1491         rc = lu_env_init(&env, LCT_LOCAL);
1492         if (rc != 0) {
1493                 CDEBUG(D_LFSCK, "%.16s: OI scrub fail to init env: rc = %d\n",
1494                        osd_scrub2name(scrub), rc);
1495                 GOTO(noenv, rc);
1496         }
1497
1498         rc = osd_scrub_prep(dev);
1499         if (rc != 0) {
1500                 CDEBUG(D_LFSCK, "%.16s: OI scrub fail to scrub prep: rc = %d\n",
1501                        osd_scrub2name(scrub), rc);
1502                 GOTO(out, rc);
1503         }
1504
1505         if (!scrub->os_full_speed && !scrub->os_partial_scan) {
1506                 struct l_wait_info lwi = { 0 };
1507                 struct osd_otable_it *it = dev->od_otable_it;
1508                 struct osd_otable_cache *ooc = &it->ooi_cache;
1509
1510                 l_wait_event(thread->t_ctl_waitq,
1511                              it->ooi_user_ready || !thread_is_running(thread),
1512                              &lwi);
1513                 if (unlikely(!thread_is_running(thread)))
1514                         GOTO(post, rc = 0);
1515
1516                 scrub->os_pos_current = ooc->ooc_pos_preload;
1517         }
1518
1519         CDEBUG(D_LFSCK, "%.16s: OI scrub start, flags = 0x%x, pos = %u\n",
1520                osd_scrub2name(scrub), scrub->os_start_flags,
1521                scrub->os_pos_current);
1522
1523         rc = osd_inode_iteration(osd_oti_get(&env), dev, ~0U, false);
1524         if (unlikely(rc == SCRUB_IT_CRASH))
1525                 GOTO(out, rc = -EINVAL);
1526         GOTO(post, rc);
1527
1528 post:
1529         rc = osd_scrub_post(scrub, rc);
1530         CDEBUG(D_LFSCK, "%.16s: OI scrub: stop, pos = %u: rc = %d\n",
1531                osd_scrub2name(scrub), scrub->os_pos_current, rc);
1532
1533 out:
1534         while (!list_empty(&scrub->os_inconsistent_items)) {
1535                 struct osd_inconsistent_item *oii;
1536
1537                 oii = list_entry(scrub->os_inconsistent_items.next,
1538                                      struct osd_inconsistent_item, oii_list);
1539                 list_del_init(&oii->oii_list);
1540                 OBD_FREE_PTR(oii);
1541         }
1542         lu_env_fini(&env);
1543
1544 noenv:
1545         spin_lock(&scrub->os_lock);
1546         thread_set_flags(thread, SVC_STOPPED);
1547         wake_up_all(&thread->t_ctl_waitq);
1548         spin_unlock(&scrub->os_lock);
1549         return rc;
1550 }
1551
1552 /* initial OI scrub */
1553
1554 typedef int (*scandir_t)(struct osd_thread_info *, struct osd_device *,
1555                          struct dentry *, filldir_t filldir);
1556
1557 #ifdef HAVE_FILLDIR_USE_CTX
1558 static int osd_ios_varfid_fill(struct dir_context *buf, const char *name,
1559                                int namelen, loff_t offset, __u64 ino,
1560                                unsigned d_type);
1561 static int osd_ios_lf_fill(struct dir_context *buf, const char *name,
1562                            int namelen, loff_t offset, __u64 ino,
1563                            unsigned d_type);
1564 static int osd_ios_dl_fill(struct dir_context *buf, const char *name,
1565                            int namelen, loff_t offset, __u64 ino,
1566                            unsigned d_type);
1567 static int osd_ios_uld_fill(struct dir_context *buf, const char *name,
1568                             int namelen, loff_t offset, __u64 ino,
1569                             unsigned d_type);
1570 #else
1571 static int osd_ios_varfid_fill(void *buf, const char *name, int namelen,
1572                                loff_t offset, __u64 ino, unsigned d_type);
1573 static int osd_ios_lf_fill(void *buf, const char *name, int namelen,
1574                            loff_t offset, __u64 ino, unsigned d_type);
1575 static int osd_ios_dl_fill(void *buf, const char *name, int namelen,
1576                            loff_t offset, __u64 ino, unsigned d_type);
1577 static int osd_ios_uld_fill(void *buf, const char *name, int namelen,
1578                             loff_t offset, __u64 ino, unsigned d_type);
1579 #endif
1580
1581 static int
1582 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
1583                      struct dentry *dentry, filldir_t filldir);
1584 static int
1585 osd_ios_ROOT_scan(struct osd_thread_info *info, struct osd_device *dev,
1586                   struct dentry *dentry, filldir_t filldir);
1587
1588 static int
1589 osd_ios_OBJECTS_scan(struct osd_thread_info *info, struct osd_device *dev,
1590                      struct dentry *dentry, filldir_t filldir);
1591
1592 enum osd_lf_flags {
1593         OLF_SCAN_SUBITEMS       = 0x0001,
1594         OLF_HIDE_FID            = 0x0002,
1595         OLF_SHOW_NAME           = 0x0004,
1596         OLF_NO_OI               = 0x0008,
1597         OLF_IDX_IN_FID          = 0x0010,
1598 };
1599
1600 struct osd_lf_map {
1601         char            *olm_name;
1602         struct lu_fid    olm_fid;
1603         __u16            olm_flags;
1604         __u16            olm_namelen;
1605         scandir_t        olm_scandir;
1606         filldir_t        olm_filldir;
1607 };
1608
1609 /* Add the new introduced local files in the list in the future. */
1610 static const struct osd_lf_map osd_lf_maps[] = {
1611         /* CATALOGS */
1612         {
1613                 .olm_name       = CATLIST,
1614                 .olm_fid        = {
1615                         .f_seq  = FID_SEQ_LOCAL_FILE,
1616                         .f_oid  = LLOG_CATALOGS_OID,
1617                 },
1618                 .olm_flags      = OLF_SHOW_NAME,
1619                 .olm_namelen    = sizeof(CATLIST) - 1,
1620         },
1621
1622         /* CONFIGS */
1623         {
1624                 .olm_name       = MOUNT_CONFIGS_DIR,
1625                 .olm_fid        = {
1626                         .f_seq  = FID_SEQ_LOCAL_FILE,
1627                         .f_oid  = MGS_CONFIGS_OID,
1628                 },
1629                 .olm_flags      = OLF_SCAN_SUBITEMS,
1630                 .olm_namelen    = sizeof(MOUNT_CONFIGS_DIR) - 1,
1631                 .olm_scandir    = osd_ios_general_scan,
1632                 .olm_filldir    = osd_ios_varfid_fill,
1633         },
1634
1635         /* NIDTBL_VERSIONS */
1636         {
1637                 .olm_name       = MGS_NIDTBL_DIR,
1638                 .olm_flags      = OLF_SCAN_SUBITEMS,
1639                 .olm_namelen    = sizeof(MGS_NIDTBL_DIR) - 1,
1640                 .olm_scandir    = osd_ios_general_scan,
1641                 .olm_filldir    = osd_ios_varfid_fill,
1642         },
1643
1644         /* PENDING */
1645         {
1646                 .olm_name       = "PENDING",
1647                 .olm_namelen    = sizeof("PENDING") - 1,
1648         },
1649
1650         /* ROOT */
1651         {
1652                 .olm_name       = "ROOT",
1653                 .olm_fid        = {
1654                         .f_seq  = FID_SEQ_ROOT,
1655                         .f_oid  = FID_OID_ROOT,
1656                 },
1657                 .olm_flags      = OLF_SCAN_SUBITEMS | OLF_HIDE_FID,
1658                 .olm_namelen    = sizeof("ROOT") - 1,
1659                 .olm_scandir    = osd_ios_ROOT_scan,
1660         },
1661
1662         /* changelog_catalog */
1663         {
1664                 .olm_name       = CHANGELOG_CATALOG,
1665                 .olm_namelen    = sizeof(CHANGELOG_CATALOG) - 1,
1666         },
1667
1668         /* changelog_users */
1669         {
1670                 .olm_name       = CHANGELOG_USERS,
1671                 .olm_namelen    = sizeof(CHANGELOG_USERS) - 1,
1672         },
1673
1674         /* fld */
1675         {
1676                 .olm_name       = "fld",
1677                 .olm_fid        = {
1678                         .f_seq  = FID_SEQ_LOCAL_FILE,
1679                         .f_oid  = FLD_INDEX_OID,
1680                 },
1681                 .olm_flags      = OLF_SHOW_NAME,
1682                 .olm_namelen    = sizeof("fld") - 1,
1683         },
1684
1685         /* last_rcvd */
1686         {
1687                 .olm_name       = LAST_RCVD,
1688                 .olm_fid        = {
1689                         .f_seq  = FID_SEQ_LOCAL_FILE,
1690                         .f_oid  = LAST_RECV_OID,
1691                 },
1692                 .olm_flags      = OLF_SHOW_NAME,
1693                 .olm_namelen    = sizeof(LAST_RCVD) - 1,
1694         },
1695
1696         /* reply_data */
1697         {
1698                 .olm_name       = REPLY_DATA,
1699                 .olm_fid        = {
1700                         .f_seq  = FID_SEQ_LOCAL_FILE,
1701                         .f_oid  = REPLY_DATA_OID,
1702                 },
1703                 .olm_flags      = OLF_SHOW_NAME,
1704                 .olm_namelen    = sizeof(REPLY_DATA) - 1,
1705         },
1706
1707         /* lov_objid */
1708         {
1709                 .olm_name       = LOV_OBJID,
1710                 .olm_fid        = {
1711                         .f_seq  = FID_SEQ_LOCAL_FILE,
1712                         .f_oid  = MDD_LOV_OBJ_OID,
1713                 },
1714                 .olm_flags      = OLF_SHOW_NAME,
1715                 .olm_namelen    = sizeof(LOV_OBJID) - 1,
1716         },
1717
1718         /* lov_objseq */
1719         {
1720                 .olm_name       = LOV_OBJSEQ,
1721                 .olm_fid        = {
1722                         .f_seq  = FID_SEQ_LOCAL_FILE,
1723                         .f_oid  = MDD_LOV_OBJ_OSEQ,
1724                 },
1725                 .olm_flags      = OLF_SHOW_NAME,
1726                 .olm_namelen    = sizeof(LOV_OBJSEQ) - 1,
1727         },
1728
1729         /* quota_master */
1730         {
1731                 .olm_name       = QMT_DIR,
1732                 .olm_flags      = OLF_SCAN_SUBITEMS,
1733                 .olm_namelen    = sizeof(QMT_DIR) - 1,
1734                 .olm_scandir    = osd_ios_general_scan,
1735                 .olm_filldir    = osd_ios_varfid_fill,
1736         },
1737
1738         /* quota_slave */
1739         {
1740                 .olm_name       = QSD_DIR,
1741                 .olm_flags      = OLF_SCAN_SUBITEMS,
1742                 .olm_namelen    = sizeof(QSD_DIR) - 1,
1743                 .olm_scandir    = osd_ios_general_scan,
1744                 .olm_filldir    = osd_ios_varfid_fill,
1745         },
1746
1747         /* seq_ctl */
1748         {
1749                 .olm_name       = "seq_ctl",
1750                 .olm_fid        = {
1751                         .f_seq  = FID_SEQ_LOCAL_FILE,
1752                         .f_oid  = FID_SEQ_CTL_OID,
1753                 },
1754                 .olm_flags      = OLF_SHOW_NAME,
1755                 .olm_namelen    = sizeof("seq_ctl") - 1,
1756         },
1757
1758         /* seq_srv */
1759         {
1760                 .olm_name       = "seq_srv",
1761                 .olm_fid        = {
1762                         .f_seq  = FID_SEQ_LOCAL_FILE,
1763                         .f_oid  = FID_SEQ_SRV_OID,
1764                 },
1765                 .olm_flags      = OLF_SHOW_NAME,
1766                 .olm_namelen    = sizeof("seq_srv") - 1,
1767         },
1768
1769         /* health_check */
1770         {
1771                 .olm_name       = HEALTH_CHECK,
1772                 .olm_fid        = {
1773                         .f_seq  = FID_SEQ_LOCAL_FILE,
1774                         .f_oid  = OFD_HEALTH_CHECK_OID,
1775                 },
1776                 .olm_flags      = OLF_SHOW_NAME,
1777                 .olm_namelen    = sizeof(HEALTH_CHECK) - 1,
1778         },
1779
1780         /* LFSCK */
1781         {
1782                 .olm_name       = LFSCK_DIR,
1783                 .olm_namelen    = sizeof(LFSCK_DIR) - 1,
1784                 .olm_scandir    = osd_ios_general_scan,
1785                 .olm_filldir    = osd_ios_varfid_fill,
1786         },
1787
1788         /* lfsck_bookmark */
1789         {
1790                 .olm_name       = LFSCK_BOOKMARK,
1791                 .olm_namelen    = sizeof(LFSCK_BOOKMARK) - 1,
1792         },
1793
1794         /* lfsck_layout */
1795         {
1796                 .olm_name       = LFSCK_LAYOUT,
1797                 .olm_namelen    = sizeof(LFSCK_LAYOUT) - 1,
1798         },
1799
1800         /* lfsck_namespace */
1801         {
1802                 .olm_name       = LFSCK_NAMESPACE,
1803                 .olm_namelen    = sizeof(LFSCK_NAMESPACE) - 1,
1804         },
1805
1806         /* OBJECTS, upgrade from old device */
1807         {
1808                 .olm_name       = OBJECTS,
1809                 .olm_flags      = OLF_SCAN_SUBITEMS,
1810                 .olm_namelen    = sizeof(OBJECTS) - 1,
1811                 .olm_scandir    = osd_ios_OBJECTS_scan,
1812         },
1813
1814         /* lquota_v2.user, upgrade from old device */
1815         {
1816                 .olm_name       = "lquota_v2.user",
1817                 .olm_namelen    = sizeof("lquota_v2.user") - 1,
1818         },
1819
1820         /* lquota_v2.group, upgrade from old device */
1821         {
1822                 .olm_name       = "lquota_v2.group",
1823                 .olm_namelen    = sizeof("lquota_v2.group") - 1,
1824         },
1825
1826         /* LAST_GROUP, upgrade from old device */
1827         {
1828                 .olm_name       = "LAST_GROUP",
1829                 .olm_fid        = {
1830                         .f_seq  = FID_SEQ_LOCAL_FILE,
1831                         .f_oid  = OFD_LAST_GROUP_OID,
1832                 },
1833                 .olm_flags      = OLF_SHOW_NAME,
1834                 .olm_namelen    = sizeof("LAST_GROUP") - 1,
1835         },
1836
1837         /* committed batchid for cross-MDT operation */
1838         {
1839                 .olm_name       = "BATCHID",
1840                 .olm_fid        = {
1841                         .f_seq  = FID_SEQ_LOCAL_FILE,
1842                         .f_oid  = BATCHID_COMMITTED_OID,
1843                 },
1844                 .olm_flags      = OLF_SHOW_NAME,
1845                 .olm_namelen    = sizeof("BATCHID") - 1,
1846         },
1847
1848         /* OSP update logs update_log{_dir} use f_seq = FID_SEQ_UPDATE_LOG{_DIR}
1849          * and f_oid = index for their log files.  See lu_update_log{_dir}_fid()
1850          * for more details. */
1851
1852         /* update_log */
1853         {
1854                 .olm_name       = "update_log",
1855                 .olm_fid        = {
1856                         .f_seq  = FID_SEQ_UPDATE_LOG,
1857                 },
1858                 .olm_flags      = OLF_SHOW_NAME | OLF_IDX_IN_FID,
1859                 .olm_namelen    = sizeof("update_log") - 1,
1860         },
1861
1862         /* update_log_dir */
1863         {
1864                 .olm_name       = "update_log_dir",
1865                 .olm_fid        = {
1866                         .f_seq  = FID_SEQ_UPDATE_LOG_DIR,
1867                 },
1868                 .olm_flags      = OLF_SHOW_NAME | OLF_SCAN_SUBITEMS |
1869                                   OLF_IDX_IN_FID,
1870                 .olm_namelen    = sizeof("update_log_dir") - 1,
1871                 .olm_scandir    = osd_ios_general_scan,
1872                 .olm_filldir    = osd_ios_uld_fill,
1873         },
1874
1875         /* lost+found */
1876         {
1877                 .olm_name       = "lost+found",
1878                 .olm_fid        = {
1879                         .f_seq  = FID_SEQ_LOCAL_FILE,
1880                         .f_oid  = OSD_LPF_OID,
1881                 },
1882                 .olm_flags      = OLF_SCAN_SUBITEMS,
1883                 .olm_namelen    = sizeof("lost+found") - 1,
1884                 .olm_scandir    = osd_ios_general_scan,
1885                 .olm_filldir    = osd_ios_lf_fill,
1886         },
1887
1888         {
1889                 .olm_name       = NULL
1890         }
1891 };
1892
1893 /* Add the new introduced files under .lustre/ in the list in the future. */
1894 static const struct osd_lf_map osd_dl_maps[] = {
1895         /* .lustre/fid */
1896         {
1897                 .olm_name       = "fid",
1898                 .olm_fid        = {
1899                         .f_seq  = FID_SEQ_DOT_LUSTRE,
1900                         .f_oid  = FID_OID_DOT_LUSTRE_OBF,
1901                 },
1902                 .olm_namelen    = sizeof("fid") - 1,
1903         },
1904         /* .lustre/lost+found */
1905         {
1906                 .olm_name       = "lost+found",
1907                 .olm_fid        = {
1908                         .f_seq  = FID_SEQ_DOT_LUSTRE,
1909                         .f_oid  = FID_OID_DOT_LUSTRE_LPF,
1910                 },
1911                 .olm_namelen    = sizeof("lost+found") - 1,
1912         },
1913         {
1914                 .olm_name       = NULL
1915         }
1916 };
1917
1918 struct osd_ios_item {
1919         struct list_head oii_list;
1920         struct dentry   *oii_dentry;
1921         scandir_t        oii_scandir;
1922         filldir_t        oii_filldir;
1923 };
1924
1925 struct osd_ios_filldir_buf {
1926 #ifdef HAVE_DIR_CONTEXT
1927         /* please keep it as first member */
1928         struct dir_context       ctx;
1929 #endif
1930         struct osd_thread_info  *oifb_info;
1931         struct osd_device       *oifb_dev;
1932         struct dentry           *oifb_dentry;
1933 };
1934
1935 static inline struct dentry *
1936 osd_ios_lookup_one_len(const char *name, struct dentry *parent, int namelen)
1937 {
1938         struct dentry *dentry;
1939
1940         dentry = ll_lookup_one_len(name, parent, namelen);
1941         if (IS_ERR(dentry)) {
1942                 int rc = PTR_ERR(dentry);
1943
1944                 if (rc != -ENOENT)
1945                         CERROR("Fail to find %.*s in %.*s (%lu/%u): rc = %d\n",
1946                                namelen, name, parent->d_name.len,
1947                                parent->d_name.name, parent->d_inode->i_ino,
1948                                parent->d_inode->i_generation, rc);
1949
1950                 return dentry;
1951         }
1952
1953         if (dentry->d_inode == NULL) {
1954                 dput(dentry);
1955                 return ERR_PTR(-ENOENT);
1956         }
1957
1958         return dentry;
1959 }
1960
1961 static int
1962 osd_ios_new_item(struct osd_device *dev, struct dentry *dentry,
1963                  scandir_t scandir, filldir_t filldir)
1964 {
1965         struct osd_ios_item *item;
1966         ENTRY;
1967
1968         OBD_ALLOC_PTR(item);
1969         if (item == NULL)
1970                 RETURN(-ENOMEM);
1971
1972         INIT_LIST_HEAD(&item->oii_list);
1973         item->oii_dentry = dget(dentry);
1974         item->oii_scandir = scandir;
1975         item->oii_filldir = filldir;
1976         list_add_tail(&item->oii_list, &dev->od_ios_list);
1977
1978         RETURN(0);
1979 }
1980
1981 /**
1982  * osd_ios_scan_one() - check/fix LMA FID and OI entry for one inode
1983  *
1984  * The passed \a inode's \a fid is verified against the LMA FID. If the \a fid
1985  * is NULL or is empty the IGIF FID is used. The FID is verified in the OI to
1986  * reference the inode, or fixed if it is missing or references another inode.
1987  */
1988 static int
1989 osd_ios_scan_one(struct osd_thread_info *info, struct osd_device *dev,
1990                  struct inode *inode, const struct lu_fid *fid, int flags)
1991 {
1992         struct lustre_mdt_attrs *lma    = &info->oti_mdt_attrs;
1993         struct osd_inode_id     *id     = &info->oti_id;
1994         struct osd_inode_id     *id2    = &info->oti_id2;
1995         struct osd_scrub        *scrub  = &dev->od_scrub;
1996         struct scrub_file       *sf     = &scrub->os_file;
1997         struct lu_fid            tfid;
1998         int                      rc;
1999         ENTRY;
2000
2001         rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
2002         if (rc != 0 && rc != -ENODATA) {
2003                 CDEBUG(D_LFSCK, "%s: fail to get lma for init OI scrub: "
2004                        "rc = %d\n", osd_name(dev), rc);
2005
2006                 RETURN(rc);
2007         }
2008
2009         osd_id_gen(id, inode->i_ino, inode->i_generation);
2010         if (rc == -ENODATA) {
2011                 if (fid == NULL || fid_is_zero(fid) || flags & OLF_HIDE_FID) {
2012                         lu_igif_build(&tfid, inode->i_ino, inode->i_generation);
2013                 } else {
2014                         tfid = *fid;
2015                         if (flags & OLF_IDX_IN_FID) {
2016                                 LASSERT(dev->od_index >= 0);
2017
2018                                 tfid.f_oid = dev->od_index;
2019                         }
2020                 }
2021                 rc = osd_ea_fid_set(info, inode, &tfid, 0, 0);
2022                 if (rc != 0) {
2023                         CDEBUG(D_LFSCK, "%s: fail to set LMA for init OI "
2024                               "scrub: rc = %d\n", osd_name(dev), rc);
2025
2026                         RETURN(rc);
2027                 }
2028         } else {
2029                 if (lma->lma_compat & LMAC_NOT_IN_OI)
2030                         RETURN(0);
2031
2032                 tfid = lma->lma_self_fid;
2033         }
2034
2035         rc = osd_oi_lookup(info, dev, &tfid, id2, 0);
2036         if (rc != 0) {
2037                 if (rc != -ENOENT)
2038                         RETURN(rc);
2039
2040                 rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
2041                                                DTO_INDEX_INSERT, true, 0, NULL);
2042                 if (rc > 0)
2043                         rc = 0;
2044
2045                 RETURN(rc);
2046         }
2047
2048         if (osd_id_eq_strict(id, id2))
2049                 RETURN(0);
2050
2051         if (!(sf->sf_flags & SF_INCONSISTENT)) {
2052                 osd_scrub_file_reset(scrub,
2053                                      LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
2054                                      SF_INCONSISTENT);
2055                 rc = osd_scrub_file_store(scrub);
2056                 if (rc != 0)
2057                         RETURN(rc);
2058         }
2059
2060         rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
2061                                        DTO_INDEX_UPDATE, true, 0, NULL);
2062         if (rc > 0)
2063                 rc = 0;
2064
2065         RETURN(rc);
2066 }
2067
2068 /**
2069  * It scans the /lost+found, and for the OST-object (with filter_fid
2070  * or filter_fid_old), move them back to its proper /O/<seq>/d<x>.
2071  */
2072 #ifdef HAVE_FILLDIR_USE_CTX
2073 static int osd_ios_lf_fill(struct dir_context *buf,
2074 #else
2075 static int osd_ios_lf_fill(void *buf,
2076 #endif
2077                            const char *name, int namelen,
2078                            loff_t offset, __u64 ino, unsigned d_type)
2079 {
2080         struct osd_ios_filldir_buf *fill_buf =
2081                 (struct osd_ios_filldir_buf *)buf;
2082         struct osd_thread_info     *info     = fill_buf->oifb_info;
2083         struct osd_device          *dev      = fill_buf->oifb_dev;
2084         struct lu_fid              *fid      = &info->oti_fid;
2085         struct osd_scrub           *scrub    = &dev->od_scrub;
2086         struct dentry              *parent   = fill_buf->oifb_dentry;
2087         struct dentry              *child;
2088         struct inode               *dir      = parent->d_inode;
2089         struct inode               *inode;
2090         int                         rc;
2091         ENTRY;
2092
2093         /* skip any '.' started names */
2094         if (name[0] == '.')
2095                 RETURN(0);
2096
2097         scrub->os_lf_scanned++;
2098         child = osd_ios_lookup_one_len(name, parent, namelen);
2099         if (IS_ERR(child)) {
2100                 CDEBUG(D_LFSCK, "%s: cannot lookup child '%.*s': rc = %d\n",
2101                       osd_name(dev), namelen, name, (int)PTR_ERR(child));
2102                 RETURN(0);
2103         }
2104
2105         inode = child->d_inode;
2106         if (S_ISDIR(inode->i_mode)) {
2107                 rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
2108                                       osd_ios_lf_fill);
2109                 if (rc != 0)
2110                         CDEBUG(D_LFSCK, "%s: cannot add child '%.*s': "
2111                               "rc = %d\n", osd_name(dev), namelen, name, rc);
2112                 GOTO(put, rc);
2113         }
2114
2115         if (!S_ISREG(inode->i_mode))
2116                 GOTO(put, rc = 0);
2117
2118         rc = osd_scrub_get_fid(info, dev, inode, fid, true);
2119         if (rc == SCRUB_NEXT_OSTOBJ || rc == SCRUB_NEXT_OSTOBJ_OLD) {
2120                 rc = osd_obj_map_recover(info, dev, dir, child, fid);
2121                 if (rc == 0) {
2122                         CDEBUG(D_LFSCK, "recovered '%.*s' ["DFID"] from "
2123                                "/lost+found.\n", namelen, name, PFID(fid));
2124                         scrub->os_lf_repaired++;
2125                 } else {
2126                         CDEBUG(D_LFSCK, "%s: cannot rename for '%.*s' "
2127                                DFID": rc = %d\n",
2128                                osd_name(dev), namelen, name, PFID(fid), rc);
2129                 }
2130         }
2131
2132         /* XXX: For MDT-objects, we can move them from /lost+found to namespace
2133          *      visible place, such as the /ROOT/.lustre/lost+found, then LFSCK
2134          *      can process them in furtuer. */
2135
2136         GOTO(put, rc);
2137
2138 put:
2139         if (rc < 0)
2140                 scrub->os_lf_failed++;
2141         dput(child);
2142         /* skip the failure to make the scanning to continue. */
2143         return 0;
2144 }
2145
2146 #ifdef HAVE_FILLDIR_USE_CTX
2147 static int osd_ios_varfid_fill(struct dir_context *buf,
2148 #else
2149 static int osd_ios_varfid_fill(void *buf,
2150 #endif
2151                                const char *name, int namelen,
2152                                loff_t offset, __u64 ino, unsigned d_type)
2153 {
2154         struct osd_ios_filldir_buf *fill_buf =
2155                 (struct osd_ios_filldir_buf *)buf;
2156         struct osd_device          *dev      = fill_buf->oifb_dev;
2157         struct dentry              *child;
2158         int                         rc;
2159         ENTRY;
2160
2161         /* skip any '.' started names */
2162         if (name[0] == '.')
2163                 RETURN(0);
2164
2165         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2166         if (IS_ERR(child))
2167                 RETURN(PTR_ERR(child));
2168
2169         rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
2170                               NULL, 0);
2171         if (rc == 0 && S_ISDIR(child->d_inode->i_mode))
2172                 rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
2173                                       osd_ios_varfid_fill);
2174         dput(child);
2175
2176         RETURN(rc);
2177 }
2178
2179 #ifdef HAVE_FILLDIR_USE_CTX
2180 static int osd_ios_dl_fill(struct dir_context *buf,
2181 #else
2182 static int osd_ios_dl_fill(void *buf,
2183 #endif
2184                            const char *name, int namelen,
2185                            loff_t offset, __u64 ino, unsigned d_type)
2186 {
2187         struct osd_ios_filldir_buf *fill_buf =
2188                 (struct osd_ios_filldir_buf *)buf;
2189         struct osd_device          *dev      = fill_buf->oifb_dev;
2190         const struct osd_lf_map    *map;
2191         struct dentry              *child;
2192         int                         rc       = 0;
2193         ENTRY;
2194
2195         /* skip any '.' started names */
2196         if (name[0] == '.')
2197                 RETURN(0);
2198
2199         for (map = osd_dl_maps; map->olm_name != NULL; map++) {
2200                 if (map->olm_namelen != namelen)
2201                         continue;
2202
2203                 if (strncmp(map->olm_name, name, namelen) == 0)
2204                         break;
2205         }
2206
2207         if (map->olm_name == NULL)
2208                 RETURN(0);
2209
2210         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2211         if (IS_ERR(child))
2212                 RETURN(PTR_ERR(child));
2213
2214         rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
2215                               &map->olm_fid, map->olm_flags);
2216         dput(child);
2217
2218         RETURN(rc);
2219 }
2220
2221 #ifdef HAVE_FILLDIR_USE_CTX
2222 static int osd_ios_uld_fill(struct dir_context *buf,
2223 #else
2224 static int osd_ios_uld_fill(void *buf,
2225 #endif
2226                             const char *name, int namelen,
2227                             loff_t offset, __u64 ino, unsigned d_type)
2228 {
2229         struct osd_ios_filldir_buf *fill_buf =
2230                 (struct osd_ios_filldir_buf *)buf;
2231         struct dentry              *child;
2232         struct lu_fid               tfid;
2233         int                         rc       = 0;
2234         ENTRY;
2235
2236         /* skip any non-DFID format name */
2237         if (name[0] != '[')
2238                 RETURN(0);
2239
2240         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2241         if (IS_ERR(child))
2242                 RETURN(PTR_ERR(child));
2243
2244         /* skip the start '[' */
2245         sscanf(&name[1], SFID, RFID(&tfid));
2246         if (fid_is_sane(&tfid))
2247                 rc = osd_ios_scan_one(fill_buf->oifb_info, fill_buf->oifb_dev,
2248                                       child->d_inode, &tfid, 0);
2249         else
2250                 rc = -EIO;
2251         dput(child);
2252
2253         RETURN(rc);
2254 }
2255
2256 #ifdef HAVE_FILLDIR_USE_CTX
2257 static int osd_ios_root_fill(struct dir_context *buf,
2258 #else
2259 static int osd_ios_root_fill(void *buf,
2260 #endif
2261                              const char *name, int namelen,
2262                              loff_t offset, __u64 ino, unsigned d_type)
2263 {
2264         struct osd_ios_filldir_buf *fill_buf =
2265                 (struct osd_ios_filldir_buf *)buf;
2266         struct osd_device          *dev      = fill_buf->oifb_dev;
2267         const struct osd_lf_map    *map;
2268         struct dentry              *child;
2269         int                         rc       = 0;
2270         ENTRY;
2271
2272         /* skip any '.' started names */
2273         if (name[0] == '.')
2274                 RETURN(0);
2275
2276         for (map = osd_lf_maps; map->olm_name != NULL; map++) {
2277                 if (map->olm_namelen != namelen)
2278                         continue;
2279
2280                 if (strncmp(map->olm_name, name, namelen) == 0)
2281                         break;
2282         }
2283
2284         if (map->olm_name == NULL)
2285                 RETURN(0);
2286
2287         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2288         if (IS_ERR(child))
2289                 RETURN(PTR_ERR(child));
2290
2291         if (!(map->olm_flags & OLF_NO_OI))
2292                 rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
2293                                       &map->olm_fid, map->olm_flags);
2294         if (rc == 0 && map->olm_flags & OLF_SCAN_SUBITEMS)
2295                 rc = osd_ios_new_item(dev, child, map->olm_scandir,
2296                                       map->olm_filldir);
2297         dput(child);
2298
2299         RETURN(rc);
2300 }
2301
2302 static int
2303 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
2304                      struct dentry *dentry, filldir_t filldir)
2305 {
2306         struct osd_ios_filldir_buf    buf   = {
2307 #ifdef HAVE_DIR_CONTEXT
2308                                                 .ctx.actor = filldir,
2309 #endif
2310                                                 .oifb_info = info,
2311                                                 .oifb_dev = dev,
2312                                                 .oifb_dentry = dentry };
2313         struct file                  *filp  = &info->oti_file;
2314         struct inode                 *inode = dentry->d_inode;
2315         const struct file_operations *fops  = inode->i_fop;
2316         int                           rc;
2317         ENTRY;
2318
2319         LASSERT(filldir != NULL);
2320
2321         filp->f_pos = 0;
2322         filp->f_path.dentry = dentry;
2323         filp->f_mode = FMODE_64BITHASH;
2324         filp->f_mapping = inode->i_mapping;
2325         filp->f_op = fops;
2326         filp->private_data = NULL;
2327         set_file_inode(filp, inode);
2328
2329 #ifdef HAVE_DIR_CONTEXT
2330         buf.ctx.pos = filp->f_pos;
2331         rc = fops->iterate(filp, &buf.ctx);
2332         filp->f_pos = buf.ctx.pos;
2333 #else
2334         rc = fops->readdir(filp, &buf, filldir);
2335 #endif
2336         fops->release(inode, filp);
2337
2338         RETURN(rc);
2339 }
2340
2341 static int
2342 osd_ios_ROOT_scan(struct osd_thread_info *info, struct osd_device *dev,
2343                   struct dentry *dentry, filldir_t filldir)
2344 {
2345         struct osd_scrub  *scrub  = &dev->od_scrub;
2346         struct scrub_file *sf     = &scrub->os_file;
2347         struct dentry     *child;
2348         int                rc;
2349         ENTRY;
2350
2351         /* It is existing MDT0 device. We only allow the case of object without
2352          * LMA to happen on the MDT0, which is usually for old 1.8 MDT. Then we
2353          * can generate IGIF mode FID for the object and related OI mapping. If
2354          * it is on other MDTs, then becuase file-level backup/restore, related
2355          * OI mapping may be invalid already, we do not know which is the right
2356          * FID for the object. We only allow IGIF objects to reside on the MDT0.
2357          *
2358          * XXX: For the case of object on non-MDT0 device with neither LMA nor
2359          *      "fid" xattr, then something crashed. We cannot re-generate the
2360          *      FID directly, instead, the OI scrub will scan the OI structure
2361          *      and try to re-generate the LMA from the OI mapping. But if the
2362          *      OI mapping crashed or lost also, then we have to give up under
2363          *      double failure cases. */
2364         scrub->os_convert_igif = 1;
2365         child = osd_ios_lookup_one_len(dot_lustre_name, dentry,
2366                                        strlen(dot_lustre_name));
2367         if (IS_ERR(child)) {
2368                 rc = PTR_ERR(child);
2369                 if (rc == -ENOENT) {
2370                         /* It is 1.8 MDT device. */
2371                         if (!(sf->sf_flags & SF_UPGRADE)) {
2372                                 osd_scrub_file_reset(scrub,
2373                                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
2374                                         SF_UPGRADE);
2375                                 sf->sf_internal_flags &= ~SIF_NO_HANDLE_OLD_FID;
2376                                 rc = osd_scrub_file_store(scrub);
2377                         } else {
2378                                 rc = 0;
2379                         }
2380                 }
2381         } else {
2382                 /* For lustre-2.x (x <= 3), the ".lustre" has NO FID-in-LMA,
2383                  * so the client will get IGIF for the ".lustre" object when
2384                  * the MDT restart.
2385                  *
2386                  * From the OI scrub view, when the MDT upgrade to Lustre-2.4,
2387                  * it does not know whether there are some old clients cached
2388                  * the ".lustre" IGIF during the upgrading. Two choices:
2389                  *
2390                  * 1) Generate IGIF-in-LMA and IGIF-in-OI for the ".lustre".
2391                  *    It will allow the old connected clients to access the
2392                  *    ".lustre" with cached IGIF. But it will cause others
2393                  *    on the MDT failed to check "fid_is_dot_lustre()".
2394                  *
2395                  * 2) Use fixed FID {FID_SEQ_DOT_LUSTRE, FID_OID_DOT_LUSTRE, 0}
2396                  *    for ".lustre" in spite of whether there are some clients
2397                  *    cached the ".lustre" IGIF or not. It enables the check
2398                  *    "fid_is_dot_lustre()" on the MDT, although it will cause
2399                  *    that the old connected clients cannot access the ".lustre"
2400                  *    with the cached IGIF.
2401                  *
2402                  * Usually, it is rare case for the old connected clients
2403                  * to access the ".lustre" with cached IGIF. So we prefer
2404                  * to the solution 2). */
2405                 rc = osd_ios_scan_one(info, dev, child->d_inode,
2406                                       &LU_DOT_LUSTRE_FID, 0);
2407                 if (rc == 0)
2408                         rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
2409                                               osd_ios_dl_fill);
2410                 dput(child);
2411         }
2412
2413         RETURN(rc);
2414 }
2415
2416 static int
2417 osd_ios_OBJECTS_scan(struct osd_thread_info *info, struct osd_device *dev,
2418                      struct dentry *dentry, filldir_t filldir)
2419 {
2420         struct osd_scrub  *scrub  = &dev->od_scrub;
2421         struct scrub_file *sf     = &scrub->os_file;
2422         struct dentry     *child;
2423         int                rc;
2424         ENTRY;
2425
2426         if (unlikely(sf->sf_internal_flags & SIF_NO_HANDLE_OLD_FID)) {
2427                 sf->sf_internal_flags &= ~SIF_NO_HANDLE_OLD_FID;
2428                 rc = osd_scrub_file_store(scrub);
2429                 if (rc != 0)
2430                         RETURN(rc);
2431         }
2432
2433         child = osd_ios_lookup_one_len(ADMIN_USR, dentry, strlen(ADMIN_USR));
2434         if (!IS_ERR(child)) {
2435                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
2436                 dput(child);
2437         } else {
2438                 rc = PTR_ERR(child);
2439         }
2440
2441         if (rc != 0 && rc != -ENOENT)
2442                 RETURN(rc);
2443
2444         child = osd_ios_lookup_one_len(ADMIN_GRP, dentry, strlen(ADMIN_GRP));
2445         if (!IS_ERR(child)) {
2446                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
2447                 dput(child);
2448         } else {
2449                 rc = PTR_ERR(child);
2450         }
2451
2452         if (rc == -ENOENT)
2453                 rc = 0;
2454
2455         RETURN(rc);
2456 }
2457
2458 static int osd_initial_OI_scrub(struct osd_thread_info *info,
2459                                 struct osd_device *dev)
2460 {
2461         struct osd_ios_item     *item    = NULL;
2462         scandir_t                scandir = osd_ios_general_scan;
2463         filldir_t                filldir = osd_ios_root_fill;
2464         struct dentry           *dentry  = osd_sb(dev)->s_root;
2465         const struct osd_lf_map *map     = osd_lf_maps;
2466         int                      rc;
2467         ENTRY;
2468
2469         /* Lookup IGIF in OI by force for initial OI scrub. */
2470         dev->od_igif_inoi = 1;
2471
2472         while (1) {
2473                 rc = scandir(info, dev, dentry, filldir);
2474                 if (item != NULL) {
2475                         dput(item->oii_dentry);
2476                         OBD_FREE_PTR(item);
2477                 }
2478
2479                 if (rc != 0)
2480                         break;
2481
2482                 if (list_empty(&dev->od_ios_list))
2483                         break;
2484
2485                 item = list_entry(dev->od_ios_list.next,
2486                                   struct osd_ios_item, oii_list);
2487                 list_del_init(&item->oii_list);
2488
2489                 LASSERT(item->oii_scandir != NULL);
2490                 scandir = item->oii_scandir;
2491                 filldir = item->oii_filldir;
2492                 dentry = item->oii_dentry;
2493         }
2494
2495         while (!list_empty(&dev->od_ios_list)) {
2496                 item = list_entry(dev->od_ios_list.next,
2497                                   struct osd_ios_item, oii_list);
2498                 list_del_init(&item->oii_list);
2499                 dput(item->oii_dentry);
2500                 OBD_FREE_PTR(item);
2501         }
2502
2503         if (rc != 0)
2504                 RETURN(rc);
2505
2506         /* There maybe the case that the object has been removed, but its OI
2507          * mapping is still in the OI file, such as the "CATALOGS" after MDT
2508          * file-level backup/restore. So here cleanup the stale OI mappings. */
2509         while (map->olm_name != NULL) {
2510                 struct dentry *child;
2511
2512                 if (fid_is_zero(&map->olm_fid)) {
2513                         map++;
2514                         continue;
2515                 }
2516
2517                 child = osd_ios_lookup_one_len(map->olm_name,
2518                                                osd_sb(dev)->s_root,
2519                                                map->olm_namelen);
2520                 if (!IS_ERR(child))
2521                         dput(child);
2522                 else if (PTR_ERR(child) == -ENOENT)
2523                         osd_scrub_refresh_mapping(info, dev, &map->olm_fid,
2524                                                   NULL, DTO_INDEX_DELETE,
2525                                                   true, 0, NULL);
2526                 map++;
2527         }
2528
2529         RETURN(0);
2530 }
2531
2532 char *osd_lf_fid2name(const struct lu_fid *fid)
2533 {
2534         const struct osd_lf_map *map = osd_lf_maps;
2535
2536         while (map->olm_name != NULL) {
2537                 if (!lu_fid_eq(fid, &map->olm_fid)) {
2538                         map++;
2539                         continue;
2540                 }
2541
2542                 if (map->olm_flags & OLF_SHOW_NAME)
2543                         return map->olm_name;
2544                 else
2545                         return "";
2546         }
2547
2548         return NULL;
2549 }
2550
2551 /* OI scrub start/stop */
2552
2553 static int do_osd_scrub_start(struct osd_device *dev, __u32 flags)
2554 {
2555         struct osd_scrub     *scrub  = &dev->od_scrub;
2556         struct ptlrpc_thread *thread = &scrub->os_thread;
2557         struct l_wait_info    lwi    = { 0 };
2558         struct task_struct   *task;
2559         int                   rc;
2560         ENTRY;
2561
2562         /* os_lock: sync status between stop and scrub thread */
2563         spin_lock(&scrub->os_lock);
2564
2565 again:
2566         if (thread_is_running(thread)) {
2567                 spin_unlock(&scrub->os_lock);
2568                 if (!(scrub->os_file.sf_flags & SF_AUTO ||
2569                       scrub->os_partial_scan) ||
2570                      (flags & SS_AUTO_PARTIAL))
2571                         RETURN(-EALREADY);
2572
2573                 osd_scrub_join(dev, flags, false);
2574                 spin_lock(&scrub->os_lock);
2575                 if (!thread_is_running(thread))
2576                         goto again;
2577
2578                 spin_unlock(&scrub->os_lock);
2579                 RETURN(0);
2580         }
2581
2582         if (unlikely(thread_is_stopping(thread))) {
2583                 spin_unlock(&scrub->os_lock);
2584                 l_wait_event(thread->t_ctl_waitq,
2585                              thread_is_stopped(thread),
2586                              &lwi);
2587                 spin_lock(&scrub->os_lock);
2588                 goto again;
2589         }
2590         spin_unlock(&scrub->os_lock);
2591
2592         if (scrub->os_file.sf_status == SS_COMPLETED) {
2593                 if (!(flags & SS_SET_FAILOUT))
2594                         flags |= SS_CLEAR_FAILOUT;
2595
2596                 if (!(flags & SS_SET_DRYRUN))
2597                         flags |= SS_CLEAR_DRYRUN;
2598
2599                 flags |= SS_RESET;
2600         }
2601
2602         scrub->os_start_flags = flags;
2603         thread_set_flags(thread, 0);
2604         task = kthread_run(osd_scrub_main, dev, "OI_scrub");
2605         if (IS_ERR(task)) {
2606                 rc = PTR_ERR(task);
2607                 CERROR("%.16s: cannot start iteration thread: rc = %d\n",
2608                        osd_scrub2name(scrub), rc);
2609                 RETURN(rc);
2610         }
2611
2612         l_wait_event(thread->t_ctl_waitq,
2613                      thread_is_running(thread) || thread_is_stopped(thread),
2614                      &lwi);
2615
2616         RETURN(0);
2617 }
2618
2619 int osd_scrub_start(struct osd_device *dev, __u32 flags)
2620 {
2621         int rc;
2622         ENTRY;
2623
2624         /* od_otable_mutex: prevent curcurrent start/stop */
2625         mutex_lock(&dev->od_otable_mutex);
2626         rc = do_osd_scrub_start(dev, flags);
2627         mutex_unlock(&dev->od_otable_mutex);
2628
2629         RETURN(rc == -EALREADY ? 0 : rc);
2630 }
2631
2632 static void do_osd_scrub_stop(struct osd_scrub *scrub)
2633 {
2634         struct ptlrpc_thread *thread = &scrub->os_thread;
2635         struct l_wait_info    lwi    = { 0 };
2636
2637         /* os_lock: sync status between stop and scrub thread */
2638         spin_lock(&scrub->os_lock);
2639         if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
2640                 thread_set_flags(thread, SVC_STOPPING);
2641                 spin_unlock(&scrub->os_lock);
2642                 wake_up_all(&thread->t_ctl_waitq);
2643                 l_wait_event(thread->t_ctl_waitq,
2644                              thread_is_stopped(thread),
2645                              &lwi);
2646                 /* Do not skip the last lock/unlock, which can guarantee that
2647                  * the caller cannot return until the OI scrub thread exit. */
2648                 spin_lock(&scrub->os_lock);
2649         }
2650         spin_unlock(&scrub->os_lock);
2651 }
2652
2653 static void osd_scrub_stop(struct osd_device *dev)
2654 {
2655         /* od_otable_mutex: prevent curcurrent start/stop */
2656         mutex_lock(&dev->od_otable_mutex);
2657         dev->od_scrub.os_paused = 1;
2658         do_osd_scrub_stop(&dev->od_scrub);
2659         mutex_unlock(&dev->od_otable_mutex);
2660 }
2661
2662 /* OI scrub setup/cleanup */
2663
2664 static const char osd_scrub_name[] = "OI_scrub";
2665
2666 int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
2667 {
2668         struct osd_thread_info     *info   = osd_oti_get(env);
2669         struct osd_scrub           *scrub  = &dev->od_scrub;
2670         struct lvfs_run_ctxt       *ctxt   = &scrub->os_ctxt;
2671         struct scrub_file          *sf     = &scrub->os_file;
2672         struct super_block         *sb     = osd_sb(dev);
2673         struct ldiskfs_super_block *es     = LDISKFS_SB(sb)->s_es;
2674         struct lvfs_run_ctxt        saved;
2675         struct file                *filp;
2676         struct inode               *inode;
2677         struct lu_fid              *fid    = &info->oti_fid;
2678         bool                        dirty  = false;
2679         bool                        restored = false;
2680         int                         rc     = 0;
2681         ENTRY;
2682
2683         memset(scrub, 0, sizeof(*scrub));
2684         OBD_SET_CTXT_MAGIC(ctxt);
2685         ctxt->pwdmnt = dev->od_mnt;
2686         ctxt->pwd = dev->od_mnt->mnt_root;
2687         ctxt->fs = get_ds();
2688
2689         init_waitqueue_head(&scrub->os_thread.t_ctl_waitq);
2690         init_rwsem(&scrub->os_rwsem);
2691         spin_lock_init(&scrub->os_lock);
2692         INIT_LIST_HEAD(&scrub->os_inconsistent_items);
2693
2694         push_ctxt(&saved, ctxt);
2695         filp = filp_open(osd_scrub_name, O_RDWR | O_CREAT, 0644);
2696         if (IS_ERR(filp)) {
2697                 pop_ctxt(&saved, ctxt);
2698                 RETURN(PTR_ERR(filp));
2699         }
2700
2701         inode = file_inode(filp);
2702         /* 'What the @fid is' is not imporatant, because the object
2703          * has no OI mapping, and only is visible inside the OSD.*/
2704         lu_igif_build(fid, inode->i_ino, inode->i_generation);
2705         rc = osd_ea_fid_set(info, inode, fid, LMAC_NOT_IN_OI, 0);
2706         if (rc != 0) {
2707                 filp_close(filp, NULL);
2708                 pop_ctxt(&saved, ctxt);
2709                 RETURN(rc);
2710         }
2711
2712         scrub->os_inode = igrab(inode);
2713         filp_close(filp, NULL);
2714         pop_ctxt(&saved, ctxt);
2715
2716         rc = osd_scrub_file_load(scrub);
2717         if (rc == -ENOENT) {
2718                 osd_scrub_file_init(scrub, es->s_uuid);
2719                 /* If the "/O" dir does not exist when mount (indicated by
2720                  * osd_device::od_maybe_new), neither for the "/OI_scrub",
2721                  * then it is quite probably that the device is a new one,
2722                  * under such case, mark it as SIF_NO_HANDLE_OLD_FID.
2723                  *
2724                  * For the rare case that "/O" and "OI_scrub" both lost on
2725                  * an old device, it can be found and cleared later.
2726                  *
2727                  * For the system with "SIF_NO_HANDLE_OLD_FID", we do not
2728                  * need to check "filter_fid_old" and to convert it to
2729                  * "filter_fid" for each object, and all the IGIF should
2730                  * have their FID mapping in OI files already. */
2731                 if (dev->od_maybe_new)
2732                         sf->sf_internal_flags = SIF_NO_HANDLE_OLD_FID;
2733                 dirty = true;
2734         } else if (rc != 0) {
2735                 GOTO(cleanup_inode, rc);
2736         } else {
2737                 if (memcmp(sf->sf_uuid, es->s_uuid, 16) != 0) {
2738                         struct obd_uuid *old_uuid;
2739                         struct obd_uuid *new_uuid;
2740
2741                         OBD_ALLOC_PTR(old_uuid);
2742                         OBD_ALLOC_PTR(new_uuid);
2743                         if (old_uuid == NULL || new_uuid == NULL) {
2744                                 CERROR("%.16s: UUID has been changed, but"
2745                                        "failed to allocate RAM for report\n",
2746                                        LDISKFS_SB(sb)->s_es->s_volume_name);
2747                         } else {
2748                                 class_uuid_unparse(sf->sf_uuid, old_uuid);
2749                                 class_uuid_unparse(es->s_uuid, new_uuid);
2750                                 CERROR("%.16s: UUID has been changed from "
2751                                        "%s to %s\n",
2752                                        LDISKFS_SB(sb)->s_es->s_volume_name,
2753                                        old_uuid->uuid, new_uuid->uuid);
2754                         }
2755                         osd_scrub_file_reset(scrub, es->s_uuid,SF_INCONSISTENT);
2756                         dirty = true;
2757                         restored = true;
2758                         if (old_uuid != NULL)
2759                                 OBD_FREE_PTR(old_uuid);
2760                         if (new_uuid != NULL)
2761                                 OBD_FREE_PTR(new_uuid);
2762                 } else if (sf->sf_status == SS_SCANNING) {
2763                         sf->sf_status = SS_CRASHED;
2764                         dirty = true;
2765                 }
2766         }
2767
2768         if (sf->sf_pos_last_checkpoint != 0)
2769                 scrub->os_pos_current = sf->sf_pos_last_checkpoint + 1;
2770         else
2771                 scrub->os_pos_current = LDISKFS_FIRST_INO(sb) + 1;
2772
2773         if (dirty) {
2774                 rc = osd_scrub_file_store(scrub);
2775                 if (rc != 0)
2776                         GOTO(cleanup_inode, rc);
2777         }
2778
2779         /* Initialize OI files. */
2780         rc = osd_oi_init(info, dev, restored);
2781         if (rc < 0)
2782                 GOTO(cleanup_inode, rc);
2783
2784         rc = osd_initial_OI_scrub(info, dev);
2785         if (rc != 0)
2786                 GOTO(cleanup_oi, rc);
2787
2788         if (sf->sf_flags & SF_UPGRADE ||
2789             !(sf->sf_internal_flags & SIF_NO_HANDLE_OLD_FID ||
2790               sf->sf_success_count > 0)) {
2791                 dev->od_igif_inoi = 0;
2792                 dev->od_check_ff = dev->od_is_ost;
2793         } else {
2794                 dev->od_igif_inoi = 1;
2795                 dev->od_check_ff = 0;
2796         }
2797
2798         if (sf->sf_flags & SF_INCONSISTENT)
2799                 /* The 'od_igif_inoi' will be set under the
2800                  * following cases:
2801                  * 1) new created system, or
2802                  * 2) restored from file-level backup, or
2803                  * 3) the upgrading completed.
2804                  *
2805                  * The 'od_igif_inoi' may be cleared by OI scrub
2806                  * later if found that the system is upgrading. */
2807                 dev->od_igif_inoi = 1;
2808
2809         if (!dev->od_noscrub &&
2810             ((sf->sf_status == SS_PAUSED) ||
2811              (sf->sf_status == SS_CRASHED &&
2812               sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
2813                               SF_UPGRADE | SF_AUTO)) ||
2814              (sf->sf_status == SS_INIT &&
2815               sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
2816                               SF_UPGRADE))))
2817                 rc = osd_scrub_start(dev, SS_AUTO_FULL);
2818
2819         if (rc != 0)
2820                 GOTO(cleanup_oi, rc);
2821
2822         /* it is possible that dcache entries may keep objects after they are
2823          * deleted by OSD. While it looks safe this can cause object data to
2824          * stay until umount causing failures in tests calculating free space,
2825          * e.g. replay-ost-single. Since those dcache entries are not used
2826          * anymore let's just free them after use here */
2827         shrink_dcache_sb(sb);
2828
2829         RETURN(0);
2830 cleanup_oi:
2831         osd_oi_fini(info, dev);
2832 cleanup_inode:
2833         iput(scrub->os_inode);
2834         scrub->os_inode = NULL;
2835
2836         return rc;
2837 }
2838
2839 void osd_scrub_cleanup(const struct lu_env *env, struct osd_device *dev)
2840 {
2841         struct osd_scrub *scrub = &dev->od_scrub;
2842
2843         LASSERT(dev->od_otable_it == NULL);
2844
2845         if (scrub->os_inode != NULL) {
2846                 osd_scrub_stop(dev);
2847                 iput(scrub->os_inode);
2848                 scrub->os_inode = NULL;
2849         }
2850         if (dev->od_oi_table != NULL)
2851                 osd_oi_fini(osd_oti_get(env), dev);
2852 }
2853
2854 /* object table based iteration APIs */
2855
2856 static struct dt_it *osd_otable_it_init(const struct lu_env *env,
2857                                        struct dt_object *dt, __u32 attr)
2858 {
2859         enum dt_otable_it_flags flags = attr >> DT_OTABLE_IT_FLAGS_SHIFT;
2860         enum dt_otable_it_valid valid = attr & ~DT_OTABLE_IT_FLAGS_MASK;
2861         struct osd_device      *dev   = osd_dev(dt->do_lu.lo_dev);
2862         struct osd_scrub       *scrub = &dev->od_scrub;
2863         struct osd_otable_it   *it;
2864         __u32                   start = 0;
2865         int                     rc;
2866         ENTRY;
2867
2868         /* od_otable_mutex: prevent curcurrent init/fini */
2869         mutex_lock(&dev->od_otable_mutex);
2870         if (dev->od_otable_it != NULL)
2871                 GOTO(out, it = ERR_PTR(-EALREADY));
2872
2873         OBD_ALLOC_PTR(it);
2874         if (it == NULL)
2875                 GOTO(out, it = ERR_PTR(-ENOMEM));
2876
2877         dev->od_otable_it = it;
2878         it->ooi_dev = dev;
2879         it->ooi_cache.ooc_consumer_idx = -1;
2880         if (flags & DOIF_OUTUSED)
2881                 it->ooi_used_outside = 1;
2882
2883         if (flags & DOIF_RESET)
2884                 start |= SS_RESET;
2885
2886         if (valid & DOIV_ERROR_HANDLE) {
2887                 if (flags & DOIF_FAILOUT)
2888                         start |= SS_SET_FAILOUT;
2889                 else
2890                         start |= SS_CLEAR_FAILOUT;
2891         }
2892
2893         if (valid & DOIV_DRYRUN) {
2894                 if (flags & DOIF_DRYRUN)
2895                         start |= SS_SET_DRYRUN;
2896                 else
2897                         start |= SS_CLEAR_DRYRUN;
2898         }
2899
2900         rc = do_osd_scrub_start(dev, start & ~SS_AUTO_PARTIAL);
2901         if (rc < 0 && rc != -EALREADY) {
2902                 dev->od_otable_it = NULL;
2903                 OBD_FREE_PTR(it);
2904                 GOTO(out, it = ERR_PTR(rc));
2905         }
2906
2907         it->ooi_cache.ooc_pos_preload = scrub->os_pos_current;
2908
2909         GOTO(out, it);
2910
2911 out:
2912         mutex_unlock(&dev->od_otable_mutex);
2913         return (struct dt_it *)it;
2914 }
2915
2916 static void osd_otable_it_fini(const struct lu_env *env, struct dt_it *di)
2917 {
2918         struct osd_otable_it *it  = (struct osd_otable_it *)di;
2919         struct osd_device    *dev = it->ooi_dev;
2920
2921         /* od_otable_mutex: prevent curcurrent init/fini */
2922         mutex_lock(&dev->od_otable_mutex);
2923         do_osd_scrub_stop(&dev->od_scrub);
2924         LASSERT(dev->od_otable_it == it);
2925
2926         dev->od_otable_it = NULL;
2927         mutex_unlock(&dev->od_otable_mutex);
2928         OBD_FREE_PTR(it);
2929 }
2930
2931 static int osd_otable_it_get(const struct lu_env *env,
2932                              struct dt_it *di, const struct dt_key *key)
2933 {
2934         return 0;
2935 }
2936
2937 static void osd_otable_it_put(const struct lu_env *env, struct dt_it *di)
2938 {
2939 }
2940
2941 static inline int
2942 osd_otable_it_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
2943 {
2944         spin_lock(&scrub->os_lock);
2945         if (it->ooi_cache.ooc_pos_preload < scrub->os_pos_current ||
2946             scrub->os_waiting ||
2947             !thread_is_running(&scrub->os_thread))
2948                 it->ooi_waiting = 0;
2949         else
2950                 it->ooi_waiting = 1;
2951         spin_unlock(&scrub->os_lock);
2952
2953         return !it->ooi_waiting;
2954 }
2955
2956 static int osd_otable_it_next(const struct lu_env *env, struct dt_it *di)
2957 {
2958         struct osd_otable_it    *it     = (struct osd_otable_it *)di;
2959         struct osd_device       *dev    = it->ooi_dev;
2960         struct osd_scrub        *scrub  = &dev->od_scrub;
2961         struct osd_otable_cache *ooc    = &it->ooi_cache;
2962         struct ptlrpc_thread    *thread = &scrub->os_thread;
2963         struct l_wait_info       lwi    = { 0 };
2964         int                      rc;
2965         ENTRY;
2966
2967         LASSERT(it->ooi_user_ready);
2968
2969 again:
2970         if (!thread_is_running(thread) && !it->ooi_used_outside)
2971                 RETURN(1);
2972
2973         if (ooc->ooc_cached_items > 0) {
2974                 ooc->ooc_cached_items--;
2975                 ooc->ooc_consumer_idx = (ooc->ooc_consumer_idx + 1) &
2976                                         ~OSD_OTABLE_IT_CACHE_MASK;
2977                 RETURN(0);
2978         }
2979
2980         if (it->ooi_all_cached) {
2981                 l_wait_event(thread->t_ctl_waitq,
2982                              !thread_is_running(thread),
2983                              &lwi);
2984                 RETURN(1);
2985         }
2986
2987         if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
2988                 spin_lock(&scrub->os_lock);
2989                 scrub->os_waiting = 0;
2990                 wake_up_all(&scrub->os_thread.t_ctl_waitq);
2991                 spin_unlock(&scrub->os_lock);
2992         }
2993
2994         if (it->ooi_cache.ooc_pos_preload >= scrub->os_pos_current)
2995                 l_wait_event(thread->t_ctl_waitq,
2996                              osd_otable_it_wakeup(scrub, it),
2997                              &lwi);
2998
2999         if (!thread_is_running(thread) && !it->ooi_used_outside)
3000                 RETURN(1);
3001
3002         rc = osd_otable_it_preload(env, it);
3003         if (rc >= 0)
3004                 goto again;
3005
3006         RETURN(rc);
3007 }
3008
3009 static struct dt_key *osd_otable_it_key(const struct lu_env *env,
3010                                         const struct dt_it *di)
3011 {
3012         return NULL;
3013 }
3014
3015 static int osd_otable_it_key_size(const struct lu_env *env,
3016                                   const struct dt_it *di)
3017 {
3018         return sizeof(__u64);
3019 }
3020
3021 static int osd_otable_it_rec(const struct lu_env *env, const struct dt_it *di,
3022                              struct dt_rec *rec, __u32 attr)
3023 {
3024         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
3025         struct osd_otable_cache *ooc = &it->ooi_cache;
3026
3027         *(struct lu_fid *)rec = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_fid;
3028
3029         /* Filter out Invald FID already. */
3030         LASSERTF(fid_is_sane((struct lu_fid *)rec),
3031                  "Invalid FID "DFID", p_idx = %d, c_idx = %d\n",
3032                  PFID((struct lu_fid *)rec),
3033                  ooc->ooc_producer_idx, ooc->ooc_consumer_idx);
3034
3035         return 0;
3036 }
3037
3038 static __u64 osd_otable_it_store(const struct lu_env *env,
3039                                  const struct dt_it *di)
3040 {
3041         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
3042         struct osd_otable_cache *ooc = &it->ooi_cache;
3043         __u64                    hash;
3044
3045         if (it->ooi_user_ready && ooc->ooc_consumer_idx != -1)
3046                 hash = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_lid.oii_ino;
3047         else
3048                 hash = ooc->ooc_pos_preload;
3049         return hash;
3050 }
3051
3052 /**
3053  * Set the OSD layer iteration start position as the specified hash.
3054  */
3055 static int osd_otable_it_load(const struct lu_env *env,
3056                               const struct dt_it *di, __u64 hash)
3057 {
3058         struct osd_otable_it    *it    = (struct osd_otable_it *)di;
3059         struct osd_device       *dev   = it->ooi_dev;
3060         struct osd_otable_cache *ooc   = &it->ooi_cache;
3061         struct osd_scrub        *scrub = &dev->od_scrub;
3062         int                      rc;
3063         ENTRY;
3064
3065         /* Forbid to set iteration position after iteration started. */
3066         if (it->ooi_user_ready)
3067                 RETURN(-EPERM);
3068
3069         LASSERT(!scrub->os_partial_scan);
3070
3071         if (hash > OSD_OTABLE_MAX_HASH)
3072                 hash = OSD_OTABLE_MAX_HASH;
3073
3074         ooc->ooc_pos_preload = hash;
3075         if (ooc->ooc_pos_preload <= LDISKFS_FIRST_INO(osd_sb(dev)))
3076                 ooc->ooc_pos_preload = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
3077
3078         it->ooi_user_ready = 1;
3079         if (!scrub->os_full_speed)
3080                 wake_up_all(&scrub->os_thread.t_ctl_waitq);
3081
3082         /* Unplug OSD layer iteration by the first next() call. */
3083         rc = osd_otable_it_next(env, (struct dt_it *)it);
3084
3085         RETURN(rc);
3086 }