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LU-7782 scrub: handle slave obj of striped directory
[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, 2015, 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                LPX64", add flags = "LPX64"\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         { CATLIST, { FID_SEQ_LOCAL_FILE, LLOG_CATALOGS_OID, 0 }, OLF_SHOW_NAME,
1613                 sizeof(CATLIST) - 1, NULL, NULL },
1614
1615         /* CONFIGS */
1616         { MOUNT_CONFIGS_DIR, { FID_SEQ_LOCAL_FILE, MGS_CONFIGS_OID, 0 },
1617                 OLF_SCAN_SUBITEMS, sizeof(MOUNT_CONFIGS_DIR) - 1,
1618                 osd_ios_general_scan, osd_ios_varfid_fill },
1619
1620         /* NIDTBL_VERSIONS */
1621         { MGS_NIDTBL_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
1622                 sizeof(MGS_NIDTBL_DIR) - 1, osd_ios_general_scan,
1623                 osd_ios_varfid_fill },
1624
1625         /* PENDING */
1626         { "PENDING", { 0, 0, 0 }, 0, sizeof("PENDING") - 1, NULL, NULL },
1627
1628         /* ROOT */
1629         { "ROOT", { FID_SEQ_ROOT, FID_OID_ROOT, 0 },
1630                 OLF_SCAN_SUBITEMS | OLF_HIDE_FID, sizeof("ROOT") - 1,
1631                 osd_ios_ROOT_scan, NULL },
1632
1633         /* changelog_catalog */
1634         { CHANGELOG_CATALOG, { 0, 0, 0 }, 0, sizeof(CHANGELOG_CATALOG) - 1,
1635                 NULL, NULL },
1636
1637         /* changelog_users */
1638         { CHANGELOG_USERS, { 0, 0, 0 }, 0, sizeof(CHANGELOG_USERS) - 1,
1639                 NULL, NULL },
1640
1641         /* fld */
1642         { "fld", { FID_SEQ_LOCAL_FILE, FLD_INDEX_OID, 0 }, OLF_SHOW_NAME,
1643                 sizeof("fld") - 1, NULL, NULL },
1644
1645         /* last_rcvd */
1646         { LAST_RCVD, { FID_SEQ_LOCAL_FILE, LAST_RECV_OID, 0 }, OLF_SHOW_NAME,
1647                 sizeof(LAST_RCVD) - 1, NULL, NULL },
1648
1649         /* reply_data */
1650         { REPLY_DATA, { FID_SEQ_LOCAL_FILE, REPLY_DATA_OID, 0 }, OLF_SHOW_NAME,
1651                 sizeof(REPLY_DATA) - 1, NULL, NULL },
1652
1653         /* lov_objid */
1654         { LOV_OBJID, { FID_SEQ_LOCAL_FILE, MDD_LOV_OBJ_OID, 0 }, OLF_SHOW_NAME,
1655                 sizeof(LOV_OBJID) - 1, NULL, NULL },
1656
1657         /* lov_objseq */
1658         { LOV_OBJSEQ, { FID_SEQ_LOCAL_FILE, MDD_LOV_OBJ_OSEQ, 0 },
1659                 OLF_SHOW_NAME, sizeof(LOV_OBJSEQ) - 1, NULL, NULL },
1660
1661         /* quota_master */
1662         { QMT_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, sizeof(QMT_DIR) - 1,
1663                 osd_ios_general_scan, osd_ios_varfid_fill },
1664
1665         /* quota_slave */
1666         { QSD_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, sizeof(QSD_DIR) - 1,
1667                 osd_ios_general_scan, osd_ios_varfid_fill },
1668
1669         /* seq_ctl */
1670         { "seq_ctl", { FID_SEQ_LOCAL_FILE, FID_SEQ_CTL_OID, 0 },
1671                 OLF_SHOW_NAME, sizeof("seq_ctl") - 1, NULL, NULL },
1672
1673         /* seq_srv */
1674         { "seq_srv", { FID_SEQ_LOCAL_FILE, FID_SEQ_SRV_OID, 0 },
1675                 OLF_SHOW_NAME, sizeof("seq_srv") - 1, NULL, NULL },
1676
1677         /* health_check */
1678         { HEALTH_CHECK, { FID_SEQ_LOCAL_FILE, OFD_HEALTH_CHECK_OID, 0 },
1679                 OLF_SHOW_NAME, sizeof(HEALTH_CHECK) - 1, NULL, NULL },
1680
1681         /* LFSCK */
1682         { LFSCK_DIR, { 0, 0, 0 }, 0, sizeof(LFSCK_DIR) - 1,
1683                 osd_ios_general_scan, osd_ios_varfid_fill },
1684
1685         /* lfsck_bookmark */
1686         { LFSCK_BOOKMARK, { 0, 0, 0 }, 0, sizeof(LFSCK_BOOKMARK) - 1,
1687                 NULL, NULL },
1688
1689         /* lfsck_layout */
1690         { LFSCK_LAYOUT, { 0, 0, 0 }, 0, sizeof(LFSCK_LAYOUT) - 1,
1691                 NULL, NULL },
1692
1693         /* lfsck_namespace */
1694         { LFSCK_NAMESPACE, { 0, 0, 0 }, 0, sizeof(LFSCK_NAMESPACE) - 1,
1695                 NULL, NULL },
1696
1697         /* OBJECTS, upgrade from old device */
1698         { OBJECTS, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, sizeof(OBJECTS) - 1,
1699                 osd_ios_OBJECTS_scan, NULL },
1700
1701         /* lquota_v2.user, upgrade from old device */
1702         { "lquota_v2.user", { 0, 0, 0 }, 0, sizeof("lquota_v2.user") - 1,
1703                 NULL, NULL },
1704
1705         /* lquota_v2.group, upgrade from old device */
1706         { "lquota_v2.group", { 0, 0, 0 }, 0, sizeof("lquota_v2.group") - 1,
1707                 NULL, NULL },
1708
1709         /* LAST_GROUP, upgrade from old device */
1710         { "LAST_GROUP", { FID_SEQ_LOCAL_FILE, OFD_LAST_GROUP_OID, 0 },
1711                 OLF_SHOW_NAME, sizeof("LAST_GROUP") - 1, NULL, NULL },
1712
1713         /* committed batchid for cross-MDT operation */
1714         { "BATCHID", { FID_SEQ_LOCAL_FILE, BATCHID_COMMITTED_OID, 0 },
1715                 OLF_SHOW_NAME, sizeof("BATCHID") - 1, NULL, NULL },
1716
1717         /* OSP update logs update_log{_dir} use f_seq = FID_SEQ_UPDATE_LOG{_DIR}
1718          * and f_oid = index for their log files.  See lu_update_log{_dir}_fid()
1719          * for more details. */
1720
1721         /* update_log */
1722         { "update_log", { FID_SEQ_UPDATE_LOG, 0, 0 },
1723                 OLF_SHOW_NAME | OLF_IDX_IN_FID, sizeof("update_log") - 1,
1724                 NULL, NULL },
1725
1726         /* update_log_dir */
1727         { "update_log_dir", { FID_SEQ_UPDATE_LOG_DIR, 0, 0 },
1728                 OLF_SHOW_NAME | OLF_SCAN_SUBITEMS | OLF_IDX_IN_FID,
1729                 sizeof("update_log_dir") - 1,
1730                 osd_ios_general_scan, osd_ios_uld_fill },
1731
1732         /* lost+found */
1733         { "lost+found", { FID_SEQ_LOCAL_FILE, OSD_LPF_OID, 0 },
1734                 OLF_SCAN_SUBITEMS, sizeof("lost+found") - 1,
1735                 osd_ios_general_scan, osd_ios_lf_fill },
1736
1737         { NULL, { 0, 0, 0 }, 0, 0, NULL, NULL }
1738 };
1739
1740 /* Add the new introduced files under .lustre/ in the list in the future. */
1741 static const struct osd_lf_map osd_dl_maps[] = {
1742         /* .lustre/fid */
1743         { "fid", { FID_SEQ_DOT_LUSTRE, FID_OID_DOT_LUSTRE_OBF, 0 }, 0,
1744                 sizeof("fid") - 1, NULL, NULL },
1745
1746         /* .lustre/lost+found */
1747         { "lost+found", { FID_SEQ_DOT_LUSTRE, FID_OID_DOT_LUSTRE_LPF, 0 }, 0,
1748                 sizeof("lost+found") - 1, NULL, NULL },
1749
1750         { NULL, { 0, 0, 0 }, 0, 0, NULL, NULL }
1751 };
1752
1753 struct osd_ios_item {
1754         struct list_head oii_list;
1755         struct dentry   *oii_dentry;
1756         scandir_t        oii_scandir;
1757         filldir_t        oii_filldir;
1758 };
1759
1760 struct osd_ios_filldir_buf {
1761 #ifdef HAVE_DIR_CONTEXT
1762         /* please keep it as first member */
1763         struct dir_context       ctx;
1764 #endif
1765         struct osd_thread_info  *oifb_info;
1766         struct osd_device       *oifb_dev;
1767         struct dentry           *oifb_dentry;
1768 };
1769
1770 static inline struct dentry *
1771 osd_ios_lookup_one_len(const char *name, struct dentry *parent, int namelen)
1772 {
1773         struct dentry *dentry;
1774
1775         dentry = ll_lookup_one_len(name, parent, namelen);
1776         if (IS_ERR(dentry)) {
1777                 int rc = PTR_ERR(dentry);
1778
1779                 if (rc != -ENOENT)
1780                         CERROR("Fail to find %.*s in %.*s (%lu/%u): rc = %d\n",
1781                                namelen, name, parent->d_name.len,
1782                                parent->d_name.name, parent->d_inode->i_ino,
1783                                parent->d_inode->i_generation, rc);
1784
1785                 return dentry;
1786         }
1787
1788         if (dentry->d_inode == NULL) {
1789                 dput(dentry);
1790                 return ERR_PTR(-ENOENT);
1791         }
1792
1793         return dentry;
1794 }
1795
1796 static int
1797 osd_ios_new_item(struct osd_device *dev, struct dentry *dentry,
1798                  scandir_t scandir, filldir_t filldir)
1799 {
1800         struct osd_ios_item *item;
1801         ENTRY;
1802
1803         OBD_ALLOC_PTR(item);
1804         if (item == NULL)
1805                 RETURN(-ENOMEM);
1806
1807         INIT_LIST_HEAD(&item->oii_list);
1808         item->oii_dentry = dget(dentry);
1809         item->oii_scandir = scandir;
1810         item->oii_filldir = filldir;
1811         list_add_tail(&item->oii_list, &dev->od_ios_list);
1812
1813         RETURN(0);
1814 }
1815
1816 /**
1817  * osd_ios_scan_one() - check/fix LMA FID and OI entry for one inode
1818  *
1819  * The passed \a inode's \a fid is verified against the LMA FID. If the \a fid
1820  * is NULL or is empty the IGIF FID is used. The FID is verified in the OI to
1821  * reference the inode, or fixed if it is missing or references another inode.
1822  */
1823 static int
1824 osd_ios_scan_one(struct osd_thread_info *info, struct osd_device *dev,
1825                  struct inode *inode, const struct lu_fid *fid, int flags)
1826 {
1827         struct lustre_mdt_attrs *lma    = &info->oti_mdt_attrs;
1828         struct osd_inode_id     *id     = &info->oti_id;
1829         struct osd_inode_id     *id2    = &info->oti_id2;
1830         struct osd_scrub        *scrub  = &dev->od_scrub;
1831         struct scrub_file       *sf     = &scrub->os_file;
1832         struct lu_fid            tfid;
1833         int                      rc;
1834         ENTRY;
1835
1836         rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
1837         if (rc != 0 && rc != -ENODATA) {
1838                 CDEBUG(D_LFSCK, "%s: fail to get lma for init OI scrub: "
1839                        "rc = %d\n", osd_name(dev), rc);
1840
1841                 RETURN(rc);
1842         }
1843
1844         osd_id_gen(id, inode->i_ino, inode->i_generation);
1845         if (rc == -ENODATA) {
1846                 if (fid == NULL || fid_is_zero(fid) || flags & OLF_HIDE_FID) {
1847                         lu_igif_build(&tfid, inode->i_ino, inode->i_generation);
1848                 } else {
1849                         tfid = *fid;
1850                         if (flags & OLF_IDX_IN_FID) {
1851                                 LASSERT(dev->od_index >= 0);
1852
1853                                 tfid.f_oid = dev->od_index;
1854                         }
1855                 }
1856                 rc = osd_ea_fid_set(info, inode, &tfid, 0, 0);
1857                 if (rc != 0) {
1858                         CDEBUG(D_LFSCK, "%s: fail to set LMA for init OI "
1859                               "scrub: rc = %d\n", osd_name(dev), rc);
1860
1861                         RETURN(rc);
1862                 }
1863         } else {
1864                 if (lma->lma_compat & LMAC_NOT_IN_OI)
1865                         RETURN(0);
1866
1867                 tfid = lma->lma_self_fid;
1868         }
1869
1870         rc = osd_oi_lookup(info, dev, &tfid, id2, 0);
1871         if (rc != 0) {
1872                 if (rc != -ENOENT)
1873                         RETURN(rc);
1874
1875                 rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
1876                                                DTO_INDEX_INSERT, true, 0, NULL);
1877                 if (rc > 0)
1878                         rc = 0;
1879
1880                 RETURN(rc);
1881         }
1882
1883         if (osd_id_eq_strict(id, id2))
1884                 RETURN(0);
1885
1886         if (!(sf->sf_flags & SF_INCONSISTENT)) {
1887                 osd_scrub_file_reset(scrub,
1888                                      LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
1889                                      SF_INCONSISTENT);
1890                 rc = osd_scrub_file_store(scrub);
1891                 if (rc != 0)
1892                         RETURN(rc);
1893         }
1894
1895         rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
1896                                        DTO_INDEX_UPDATE, true, 0, NULL);
1897         if (rc > 0)
1898                 rc = 0;
1899
1900         RETURN(rc);
1901 }
1902
1903 /**
1904  * It scans the /lost+found, and for the OST-object (with filter_fid
1905  * or filter_fid_old), move them back to its proper /O/<seq>/d<x>.
1906  */
1907 #ifdef HAVE_FILLDIR_USE_CTX
1908 static int osd_ios_lf_fill(struct dir_context *buf,
1909 #else
1910 static int osd_ios_lf_fill(void *buf,
1911 #endif
1912                            const char *name, int namelen,
1913                            loff_t offset, __u64 ino, unsigned d_type)
1914 {
1915         struct osd_ios_filldir_buf *fill_buf =
1916                 (struct osd_ios_filldir_buf *)buf;
1917         struct osd_thread_info     *info     = fill_buf->oifb_info;
1918         struct osd_device          *dev      = fill_buf->oifb_dev;
1919         struct lu_fid              *fid      = &info->oti_fid;
1920         struct osd_scrub           *scrub    = &dev->od_scrub;
1921         struct dentry              *parent   = fill_buf->oifb_dentry;
1922         struct dentry              *child;
1923         struct inode               *dir      = parent->d_inode;
1924         struct inode               *inode;
1925         int                         rc;
1926         ENTRY;
1927
1928         /* skip any '.' started names */
1929         if (name[0] == '.')
1930                 RETURN(0);
1931
1932         scrub->os_lf_scanned++;
1933         child = osd_ios_lookup_one_len(name, parent, namelen);
1934         if (IS_ERR(child)) {
1935                 CDEBUG(D_LFSCK, "%s: cannot lookup child '%.*s': rc = %d\n",
1936                       osd_name(dev), namelen, name, (int)PTR_ERR(child));
1937                 RETURN(0);
1938         }
1939
1940         inode = child->d_inode;
1941         if (S_ISDIR(inode->i_mode)) {
1942                 rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
1943                                       osd_ios_lf_fill);
1944                 if (rc != 0)
1945                         CDEBUG(D_LFSCK, "%s: cannot add child '%.*s': "
1946                               "rc = %d\n", osd_name(dev), namelen, name, rc);
1947                 GOTO(put, rc);
1948         }
1949
1950         if (!S_ISREG(inode->i_mode))
1951                 GOTO(put, rc = 0);
1952
1953         rc = osd_scrub_get_fid(info, dev, inode, fid, true);
1954         if (rc == SCRUB_NEXT_OSTOBJ || rc == SCRUB_NEXT_OSTOBJ_OLD) {
1955                 rc = osd_obj_map_recover(info, dev, dir, child, fid);
1956                 if (rc == 0) {
1957                         CDEBUG(D_LFSCK, "recovered '%.*s' ["DFID"] from "
1958                                "/lost+found.\n", namelen, name, PFID(fid));
1959                         scrub->os_lf_repaired++;
1960                 } else {
1961                         CDEBUG(D_LFSCK, "%s: cannot rename for '%.*s' "
1962                                DFID": rc = %d\n",
1963                                osd_name(dev), namelen, name, PFID(fid), rc);
1964                 }
1965         }
1966
1967         /* XXX: For MDT-objects, we can move them from /lost+found to namespace
1968          *      visible place, such as the /ROOT/.lustre/lost+found, then LFSCK
1969          *      can process them in furtuer. */
1970
1971         GOTO(put, rc);
1972
1973 put:
1974         if (rc < 0)
1975                 scrub->os_lf_failed++;
1976         dput(child);
1977         /* skip the failure to make the scanning to continue. */
1978         return 0;
1979 }
1980
1981 #ifdef HAVE_FILLDIR_USE_CTX
1982 static int osd_ios_varfid_fill(struct dir_context *buf,
1983 #else
1984 static int osd_ios_varfid_fill(void *buf,
1985 #endif
1986                                const char *name, int namelen,
1987                                loff_t offset, __u64 ino, unsigned d_type)
1988 {
1989         struct osd_ios_filldir_buf *fill_buf =
1990                 (struct osd_ios_filldir_buf *)buf;
1991         struct osd_device          *dev      = fill_buf->oifb_dev;
1992         struct dentry              *child;
1993         int                         rc;
1994         ENTRY;
1995
1996         /* skip any '.' started names */
1997         if (name[0] == '.')
1998                 RETURN(0);
1999
2000         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2001         if (IS_ERR(child))
2002                 RETURN(PTR_ERR(child));
2003
2004         rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
2005                               NULL, 0);
2006         if (rc == 0 && S_ISDIR(child->d_inode->i_mode))
2007                 rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
2008                                       osd_ios_varfid_fill);
2009         dput(child);
2010
2011         RETURN(rc);
2012 }
2013
2014 #ifdef HAVE_FILLDIR_USE_CTX
2015 static int osd_ios_dl_fill(struct dir_context *buf,
2016 #else
2017 static int osd_ios_dl_fill(void *buf,
2018 #endif
2019                            const char *name, int namelen,
2020                            loff_t offset, __u64 ino, unsigned d_type)
2021 {
2022         struct osd_ios_filldir_buf *fill_buf =
2023                 (struct osd_ios_filldir_buf *)buf;
2024         struct osd_device          *dev      = fill_buf->oifb_dev;
2025         const struct osd_lf_map    *map;
2026         struct dentry              *child;
2027         int                         rc       = 0;
2028         ENTRY;
2029
2030         /* skip any '.' started names */
2031         if (name[0] == '.')
2032                 RETURN(0);
2033
2034         for (map = osd_dl_maps; map->olm_name != NULL; map++) {
2035                 if (map->olm_namelen != namelen)
2036                         continue;
2037
2038                 if (strncmp(map->olm_name, name, namelen) == 0)
2039                         break;
2040         }
2041
2042         if (map->olm_name == NULL)
2043                 RETURN(0);
2044
2045         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2046         if (IS_ERR(child))
2047                 RETURN(PTR_ERR(child));
2048
2049         rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
2050                               &map->olm_fid, map->olm_flags);
2051         dput(child);
2052
2053         RETURN(rc);
2054 }
2055
2056 #ifdef HAVE_FILLDIR_USE_CTX
2057 static int osd_ios_uld_fill(struct dir_context *buf,
2058 #else
2059 static int osd_ios_uld_fill(void *buf,
2060 #endif
2061                             const char *name, int namelen,
2062                             loff_t offset, __u64 ino, unsigned d_type)
2063 {
2064         struct osd_ios_filldir_buf *fill_buf =
2065                 (struct osd_ios_filldir_buf *)buf;
2066         struct dentry              *child;
2067         struct lu_fid               tfid;
2068         int                         rc       = 0;
2069         ENTRY;
2070
2071         /* skip any non-DFID format name */
2072         if (name[0] != '[')
2073                 RETURN(0);
2074
2075         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2076         if (IS_ERR(child))
2077                 RETURN(PTR_ERR(child));
2078
2079         /* skip the start '[' */
2080         sscanf(&name[1], SFID, RFID(&tfid));
2081         if (fid_is_sane(&tfid))
2082                 rc = osd_ios_scan_one(fill_buf->oifb_info, fill_buf->oifb_dev,
2083                                       child->d_inode, &tfid, 0);
2084         else
2085                 rc = -EIO;
2086         dput(child);
2087
2088         RETURN(rc);
2089 }
2090
2091 #ifdef HAVE_FILLDIR_USE_CTX
2092 static int osd_ios_root_fill(struct dir_context *buf,
2093 #else
2094 static int osd_ios_root_fill(void *buf,
2095 #endif
2096                              const char *name, int namelen,
2097                              loff_t offset, __u64 ino, unsigned d_type)
2098 {
2099         struct osd_ios_filldir_buf *fill_buf =
2100                 (struct osd_ios_filldir_buf *)buf;
2101         struct osd_device          *dev      = fill_buf->oifb_dev;
2102         const struct osd_lf_map    *map;
2103         struct dentry              *child;
2104         int                         rc       = 0;
2105         ENTRY;
2106
2107         /* skip any '.' started names */
2108         if (name[0] == '.')
2109                 RETURN(0);
2110
2111         for (map = osd_lf_maps; map->olm_name != NULL; map++) {
2112                 if (map->olm_namelen != namelen)
2113                         continue;
2114
2115                 if (strncmp(map->olm_name, name, namelen) == 0)
2116                         break;
2117         }
2118
2119         if (map->olm_name == NULL)
2120                 RETURN(0);
2121
2122         child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
2123         if (IS_ERR(child))
2124                 RETURN(PTR_ERR(child));
2125
2126         if (!(map->olm_flags & OLF_NO_OI))
2127                 rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
2128                                       &map->olm_fid, map->olm_flags);
2129         if (rc == 0 && map->olm_flags & OLF_SCAN_SUBITEMS)
2130                 rc = osd_ios_new_item(dev, child, map->olm_scandir,
2131                                       map->olm_filldir);
2132         dput(child);
2133
2134         RETURN(rc);
2135 }
2136
2137 static int
2138 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
2139                      struct dentry *dentry, filldir_t filldir)
2140 {
2141         struct osd_ios_filldir_buf    buf   = {
2142 #ifdef HAVE_DIR_CONTEXT
2143                                                 .ctx.actor = filldir,
2144 #endif
2145                                                 .oifb_info = info,
2146                                                 .oifb_dev = dev,
2147                                                 .oifb_dentry = dentry };
2148         struct file                  *filp  = &info->oti_file;
2149         struct inode                 *inode = dentry->d_inode;
2150         const struct file_operations *fops  = inode->i_fop;
2151         int                           rc;
2152         ENTRY;
2153
2154         LASSERT(filldir != NULL);
2155
2156         filp->f_pos = 0;
2157         filp->f_path.dentry = dentry;
2158         filp->f_mode = FMODE_64BITHASH;
2159         filp->f_mapping = inode->i_mapping;
2160         filp->f_op = fops;
2161         filp->private_data = NULL;
2162         set_file_inode(filp, inode);
2163
2164 #ifdef HAVE_DIR_CONTEXT
2165         buf.ctx.pos = filp->f_pos;
2166         rc = fops->iterate(filp, &buf.ctx);
2167         filp->f_pos = buf.ctx.pos;
2168 #else
2169         rc = fops->readdir(filp, &buf, filldir);
2170 #endif
2171         fops->release(inode, filp);
2172
2173         RETURN(rc);
2174 }
2175
2176 static int
2177 osd_ios_ROOT_scan(struct osd_thread_info *info, struct osd_device *dev,
2178                   struct dentry *dentry, filldir_t filldir)
2179 {
2180         struct osd_scrub  *scrub  = &dev->od_scrub;
2181         struct scrub_file *sf     = &scrub->os_file;
2182         struct dentry     *child;
2183         int                rc;
2184         ENTRY;
2185
2186         /* It is existing MDT0 device. We only allow the case of object without
2187          * LMA to happen on the MDT0, which is usually for old 1.8 MDT. Then we
2188          * can generate IGIF mode FID for the object and related OI mapping. If
2189          * it is on other MDTs, then becuase file-level backup/restore, related
2190          * OI mapping may be invalid already, we do not know which is the right
2191          * FID for the object. We only allow IGIF objects to reside on the MDT0.
2192          *
2193          * XXX: For the case of object on non-MDT0 device with neither LMA nor
2194          *      "fid" xattr, then something crashed. We cannot re-generate the
2195          *      FID directly, instead, the OI scrub will scan the OI structure
2196          *      and try to re-generate the LMA from the OI mapping. But if the
2197          *      OI mapping crashed or lost also, then we have to give up under
2198          *      double failure cases. */
2199         scrub->os_convert_igif = 1;
2200         child = osd_ios_lookup_one_len(dot_lustre_name, dentry,
2201                                        strlen(dot_lustre_name));
2202         if (IS_ERR(child)) {
2203                 rc = PTR_ERR(child);
2204                 if (rc == -ENOENT) {
2205                         /* It is 1.8 MDT device. */
2206                         if (!(sf->sf_flags & SF_UPGRADE)) {
2207                                 osd_scrub_file_reset(scrub,
2208                                         LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
2209                                         SF_UPGRADE);
2210                                 sf->sf_internal_flags &= ~SIF_NO_HANDLE_OLD_FID;
2211                                 rc = osd_scrub_file_store(scrub);
2212                         } else {
2213                                 rc = 0;
2214                         }
2215                 }
2216         } else {
2217                 /* For lustre-2.x (x <= 3), the ".lustre" has NO FID-in-LMA,
2218                  * so the client will get IGIF for the ".lustre" object when
2219                  * the MDT restart.
2220                  *
2221                  * From the OI scrub view, when the MDT upgrade to Lustre-2.4,
2222                  * it does not know whether there are some old clients cached
2223                  * the ".lustre" IGIF during the upgrading. Two choices:
2224                  *
2225                  * 1) Generate IGIF-in-LMA and IGIF-in-OI for the ".lustre".
2226                  *    It will allow the old connected clients to access the
2227                  *    ".lustre" with cached IGIF. But it will cause others
2228                  *    on the MDT failed to check "fid_is_dot_lustre()".
2229                  *
2230                  * 2) Use fixed FID {FID_SEQ_DOT_LUSTRE, FID_OID_DOT_LUSTRE, 0}
2231                  *    for ".lustre" in spite of whether there are some clients
2232                  *    cached the ".lustre" IGIF or not. It enables the check
2233                  *    "fid_is_dot_lustre()" on the MDT, although it will cause
2234                  *    that the old connected clients cannot access the ".lustre"
2235                  *    with the cached IGIF.
2236                  *
2237                  * Usually, it is rare case for the old connected clients
2238                  * to access the ".lustre" with cached IGIF. So we prefer
2239                  * to the solution 2). */
2240                 rc = osd_ios_scan_one(info, dev, child->d_inode,
2241                                       &LU_DOT_LUSTRE_FID, 0);
2242                 if (rc == 0)
2243                         rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
2244                                               osd_ios_dl_fill);
2245                 dput(child);
2246         }
2247
2248         RETURN(rc);
2249 }
2250
2251 static int
2252 osd_ios_OBJECTS_scan(struct osd_thread_info *info, struct osd_device *dev,
2253                      struct dentry *dentry, filldir_t filldir)
2254 {
2255         struct osd_scrub  *scrub  = &dev->od_scrub;
2256         struct scrub_file *sf     = &scrub->os_file;
2257         struct dentry     *child;
2258         int                rc;
2259         ENTRY;
2260
2261         if (unlikely(sf->sf_internal_flags & SIF_NO_HANDLE_OLD_FID)) {
2262                 sf->sf_internal_flags &= ~SIF_NO_HANDLE_OLD_FID;
2263                 rc = osd_scrub_file_store(scrub);
2264                 if (rc != 0)
2265                         RETURN(rc);
2266         }
2267
2268         child = osd_ios_lookup_one_len(ADMIN_USR, dentry, strlen(ADMIN_USR));
2269         if (!IS_ERR(child)) {
2270                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
2271                 dput(child);
2272         } else {
2273                 rc = PTR_ERR(child);
2274         }
2275
2276         if (rc != 0 && rc != -ENOENT)
2277                 RETURN(rc);
2278
2279         child = osd_ios_lookup_one_len(ADMIN_GRP, dentry, strlen(ADMIN_GRP));
2280         if (!IS_ERR(child)) {
2281                 rc = osd_ios_scan_one(info, dev, child->d_inode, NULL, 0);
2282                 dput(child);
2283         } else {
2284                 rc = PTR_ERR(child);
2285         }
2286
2287         if (rc == -ENOENT)
2288                 rc = 0;
2289
2290         RETURN(rc);
2291 }
2292
2293 static int osd_initial_OI_scrub(struct osd_thread_info *info,
2294                                 struct osd_device *dev)
2295 {
2296         struct osd_ios_item     *item    = NULL;
2297         scandir_t                scandir = osd_ios_general_scan;
2298         filldir_t                filldir = osd_ios_root_fill;
2299         struct dentry           *dentry  = osd_sb(dev)->s_root;
2300         const struct osd_lf_map *map     = osd_lf_maps;
2301         int                      rc;
2302         ENTRY;
2303
2304         /* Lookup IGIF in OI by force for initial OI scrub. */
2305         dev->od_igif_inoi = 1;
2306
2307         while (1) {
2308                 rc = scandir(info, dev, dentry, filldir);
2309                 if (item != NULL) {
2310                         dput(item->oii_dentry);
2311                         OBD_FREE_PTR(item);
2312                 }
2313
2314                 if (rc != 0)
2315                         break;
2316
2317                 if (list_empty(&dev->od_ios_list))
2318                         break;
2319
2320                 item = list_entry(dev->od_ios_list.next,
2321                                   struct osd_ios_item, oii_list);
2322                 list_del_init(&item->oii_list);
2323
2324                 LASSERT(item->oii_scandir != NULL);
2325                 scandir = item->oii_scandir;
2326                 filldir = item->oii_filldir;
2327                 dentry = item->oii_dentry;
2328         }
2329
2330         while (!list_empty(&dev->od_ios_list)) {
2331                 item = list_entry(dev->od_ios_list.next,
2332                                   struct osd_ios_item, oii_list);
2333                 list_del_init(&item->oii_list);
2334                 dput(item->oii_dentry);
2335                 OBD_FREE_PTR(item);
2336         }
2337
2338         if (rc != 0)
2339                 RETURN(rc);
2340
2341         /* There maybe the case that the object has been removed, but its OI
2342          * mapping is still in the OI file, such as the "CATALOGS" after MDT
2343          * file-level backup/restore. So here cleanup the stale OI mappings. */
2344         while (map->olm_name != NULL) {
2345                 struct dentry *child;
2346
2347                 if (fid_is_zero(&map->olm_fid)) {
2348                         map++;
2349                         continue;
2350                 }
2351
2352                 child = osd_ios_lookup_one_len(map->olm_name,
2353                                                osd_sb(dev)->s_root,
2354                                                map->olm_namelen);
2355                 if (!IS_ERR(child))
2356                         dput(child);
2357                 else if (PTR_ERR(child) == -ENOENT)
2358                         osd_scrub_refresh_mapping(info, dev, &map->olm_fid,
2359                                                   NULL, DTO_INDEX_DELETE,
2360                                                   true, 0, NULL);
2361                 map++;
2362         }
2363
2364         RETURN(0);
2365 }
2366
2367 char *osd_lf_fid2name(const struct lu_fid *fid)
2368 {
2369         const struct osd_lf_map *map = osd_lf_maps;
2370
2371         while (map->olm_name != NULL) {
2372                 if (!lu_fid_eq(fid, &map->olm_fid)) {
2373                         map++;
2374                         continue;
2375                 }
2376
2377                 if (map->olm_flags & OLF_SHOW_NAME)
2378                         return map->olm_name;
2379                 else
2380                         return "";
2381         }
2382
2383         return NULL;
2384 }
2385
2386 /* OI scrub start/stop */
2387
2388 static int do_osd_scrub_start(struct osd_device *dev, __u32 flags)
2389 {
2390         struct osd_scrub     *scrub  = &dev->od_scrub;
2391         struct ptlrpc_thread *thread = &scrub->os_thread;
2392         struct l_wait_info    lwi    = { 0 };
2393         struct task_struct   *task;
2394         int                   rc;
2395         ENTRY;
2396
2397         /* os_lock: sync status between stop and scrub thread */
2398         spin_lock(&scrub->os_lock);
2399
2400 again:
2401         if (thread_is_running(thread)) {
2402                 spin_unlock(&scrub->os_lock);
2403                 if (!(scrub->os_file.sf_flags & SF_AUTO ||
2404                       scrub->os_partial_scan) ||
2405                      (flags & SS_AUTO_PARTIAL))
2406                         RETURN(-EALREADY);
2407
2408                 osd_scrub_join(dev, flags, false);
2409                 spin_lock(&scrub->os_lock);
2410                 if (!thread_is_running(thread))
2411                         goto again;
2412
2413                 spin_unlock(&scrub->os_lock);
2414                 RETURN(0);
2415         }
2416
2417         if (unlikely(thread_is_stopping(thread))) {
2418                 spin_unlock(&scrub->os_lock);
2419                 l_wait_event(thread->t_ctl_waitq,
2420                              thread_is_stopped(thread),
2421                              &lwi);
2422                 spin_lock(&scrub->os_lock);
2423                 goto again;
2424         }
2425         spin_unlock(&scrub->os_lock);
2426
2427         if (scrub->os_file.sf_status == SS_COMPLETED) {
2428                 if (!(flags & SS_SET_FAILOUT))
2429                         flags |= SS_CLEAR_FAILOUT;
2430
2431                 if (!(flags & SS_SET_DRYRUN))
2432                         flags |= SS_CLEAR_DRYRUN;
2433
2434                 flags |= SS_RESET;
2435         }
2436
2437         scrub->os_start_flags = flags;
2438         thread_set_flags(thread, 0);
2439         task = kthread_run(osd_scrub_main, dev, "OI_scrub");
2440         if (IS_ERR(task)) {
2441                 rc = PTR_ERR(task);
2442                 CERROR("%.16s: cannot start iteration thread: rc = %d\n",
2443                        osd_scrub2name(scrub), rc);
2444                 RETURN(rc);
2445         }
2446
2447         l_wait_event(thread->t_ctl_waitq,
2448                      thread_is_running(thread) || thread_is_stopped(thread),
2449                      &lwi);
2450
2451         RETURN(0);
2452 }
2453
2454 int osd_scrub_start(struct osd_device *dev, __u32 flags)
2455 {
2456         int rc;
2457         ENTRY;
2458
2459         /* od_otable_mutex: prevent curcurrent start/stop */
2460         mutex_lock(&dev->od_otable_mutex);
2461         rc = do_osd_scrub_start(dev, flags);
2462         mutex_unlock(&dev->od_otable_mutex);
2463
2464         RETURN(rc == -EALREADY ? 0 : rc);
2465 }
2466
2467 static void do_osd_scrub_stop(struct osd_scrub *scrub)
2468 {
2469         struct ptlrpc_thread *thread = &scrub->os_thread;
2470         struct l_wait_info    lwi    = { 0 };
2471
2472         /* os_lock: sync status between stop and scrub thread */
2473         spin_lock(&scrub->os_lock);
2474         if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
2475                 thread_set_flags(thread, SVC_STOPPING);
2476                 spin_unlock(&scrub->os_lock);
2477                 wake_up_all(&thread->t_ctl_waitq);
2478                 l_wait_event(thread->t_ctl_waitq,
2479                              thread_is_stopped(thread),
2480                              &lwi);
2481                 /* Do not skip the last lock/unlock, which can guarantee that
2482                  * the caller cannot return until the OI scrub thread exit. */
2483                 spin_lock(&scrub->os_lock);
2484         }
2485         spin_unlock(&scrub->os_lock);
2486 }
2487
2488 static void osd_scrub_stop(struct osd_device *dev)
2489 {
2490         /* od_otable_mutex: prevent curcurrent start/stop */
2491         mutex_lock(&dev->od_otable_mutex);
2492         dev->od_scrub.os_paused = 1;
2493         do_osd_scrub_stop(&dev->od_scrub);
2494         mutex_unlock(&dev->od_otable_mutex);
2495 }
2496
2497 /* OI scrub setup/cleanup */
2498
2499 static const char osd_scrub_name[] = "OI_scrub";
2500
2501 int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
2502 {
2503         struct osd_thread_info     *info   = osd_oti_get(env);
2504         struct osd_scrub           *scrub  = &dev->od_scrub;
2505         struct lvfs_run_ctxt       *ctxt   = &scrub->os_ctxt;
2506         struct scrub_file          *sf     = &scrub->os_file;
2507         struct super_block         *sb     = osd_sb(dev);
2508         struct ldiskfs_super_block *es     = LDISKFS_SB(sb)->s_es;
2509         struct lvfs_run_ctxt        saved;
2510         struct file                *filp;
2511         struct inode               *inode;
2512         struct lu_fid              *fid    = &info->oti_fid;
2513         bool                        dirty  = false;
2514         bool                        restored = false;
2515         int                         rc     = 0;
2516         ENTRY;
2517
2518         memset(scrub, 0, sizeof(*scrub));
2519         OBD_SET_CTXT_MAGIC(ctxt);
2520         ctxt->pwdmnt = dev->od_mnt;
2521         ctxt->pwd = dev->od_mnt->mnt_root;
2522         ctxt->fs = get_ds();
2523
2524         init_waitqueue_head(&scrub->os_thread.t_ctl_waitq);
2525         init_rwsem(&scrub->os_rwsem);
2526         spin_lock_init(&scrub->os_lock);
2527         INIT_LIST_HEAD(&scrub->os_inconsistent_items);
2528
2529         push_ctxt(&saved, ctxt);
2530         filp = filp_open(osd_scrub_name, O_RDWR | O_CREAT, 0644);
2531         if (IS_ERR(filp)) {
2532                 pop_ctxt(&saved, ctxt);
2533                 RETURN(PTR_ERR(filp));
2534         }
2535
2536         inode = file_inode(filp);
2537         /* 'What the @fid is' is not imporatant, because the object
2538          * has no OI mapping, and only is visible inside the OSD.*/
2539         lu_igif_build(fid, inode->i_ino, inode->i_generation);
2540         rc = osd_ea_fid_set(info, inode, fid, LMAC_NOT_IN_OI, 0);
2541         if (rc != 0) {
2542                 filp_close(filp, NULL);
2543                 pop_ctxt(&saved, ctxt);
2544                 RETURN(rc);
2545         }
2546
2547         scrub->os_inode = igrab(inode);
2548         filp_close(filp, NULL);
2549         pop_ctxt(&saved, ctxt);
2550
2551         rc = osd_scrub_file_load(scrub);
2552         if (rc == -ENOENT) {
2553                 osd_scrub_file_init(scrub, es->s_uuid);
2554                 /* If the "/O" dir does not exist when mount (indicated by
2555                  * osd_device::od_maybe_new), neither for the "/OI_scrub",
2556                  * then it is quite probably that the device is a new one,
2557                  * under such case, mark it as SIF_NO_HANDLE_OLD_FID.
2558                  *
2559                  * For the rare case that "/O" and "OI_scrub" both lost on
2560                  * an old device, it can be found and cleared later.
2561                  *
2562                  * For the system with "SIF_NO_HANDLE_OLD_FID", we do not
2563                  * need to check "filter_fid_old" and to convert it to
2564                  * "filter_fid" for each object, and all the IGIF should
2565                  * have their FID mapping in OI files already. */
2566                 if (dev->od_maybe_new)
2567                         sf->sf_internal_flags = SIF_NO_HANDLE_OLD_FID;
2568                 dirty = true;
2569         } else if (rc != 0) {
2570                 GOTO(cleanup_inode, rc);
2571         } else {
2572                 if (memcmp(sf->sf_uuid, es->s_uuid, 16) != 0) {
2573                         struct obd_uuid *old_uuid;
2574                         struct obd_uuid *new_uuid;
2575
2576                         OBD_ALLOC_PTR(old_uuid);
2577                         OBD_ALLOC_PTR(new_uuid);
2578                         if (old_uuid == NULL || new_uuid == NULL) {
2579                                 CERROR("%.16s: UUID has been changed, but"
2580                                        "failed to allocate RAM for report\n",
2581                                        LDISKFS_SB(sb)->s_es->s_volume_name);
2582                         } else {
2583                                 class_uuid_unparse(sf->sf_uuid, old_uuid);
2584                                 class_uuid_unparse(es->s_uuid, new_uuid);
2585                                 CERROR("%.16s: UUID has been changed from "
2586                                        "%s to %s\n",
2587                                        LDISKFS_SB(sb)->s_es->s_volume_name,
2588                                        old_uuid->uuid, new_uuid->uuid);
2589                         }
2590                         osd_scrub_file_reset(scrub, es->s_uuid,SF_INCONSISTENT);
2591                         dirty = true;
2592                         restored = true;
2593                         if (old_uuid != NULL)
2594                                 OBD_FREE_PTR(old_uuid);
2595                         if (new_uuid != NULL)
2596                                 OBD_FREE_PTR(new_uuid);
2597                 } else if (sf->sf_status == SS_SCANNING) {
2598                         sf->sf_status = SS_CRASHED;
2599                         dirty = true;
2600                 }
2601         }
2602
2603         if (sf->sf_pos_last_checkpoint != 0)
2604                 scrub->os_pos_current = sf->sf_pos_last_checkpoint + 1;
2605         else
2606                 scrub->os_pos_current = LDISKFS_FIRST_INO(sb) + 1;
2607
2608         if (dirty) {
2609                 rc = osd_scrub_file_store(scrub);
2610                 if (rc != 0)
2611                         GOTO(cleanup_inode, rc);
2612         }
2613
2614         /* Initialize OI files. */
2615         rc = osd_oi_init(info, dev, restored);
2616         if (rc < 0)
2617                 GOTO(cleanup_inode, rc);
2618
2619         rc = osd_initial_OI_scrub(info, dev);
2620         if (rc != 0)
2621                 GOTO(cleanup_oi, rc);
2622
2623         if (sf->sf_flags & SF_UPGRADE ||
2624             !(sf->sf_internal_flags & SIF_NO_HANDLE_OLD_FID ||
2625               sf->sf_success_count > 0)) {
2626                 dev->od_igif_inoi = 0;
2627                 dev->od_check_ff = dev->od_is_ost;
2628         } else {
2629                 dev->od_igif_inoi = 1;
2630                 dev->od_check_ff = 0;
2631         }
2632
2633         if (sf->sf_flags & SF_INCONSISTENT)
2634                 /* The 'od_igif_inoi' will be set under the
2635                  * following cases:
2636                  * 1) new created system, or
2637                  * 2) restored from file-level backup, or
2638                  * 3) the upgrading completed.
2639                  *
2640                  * The 'od_igif_inoi' may be cleared by OI scrub
2641                  * later if found that the system is upgrading. */
2642                 dev->od_igif_inoi = 1;
2643
2644         if (!dev->od_noscrub &&
2645             ((sf->sf_status == SS_PAUSED) ||
2646              (sf->sf_status == SS_CRASHED &&
2647               sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
2648                               SF_UPGRADE | SF_AUTO)) ||
2649              (sf->sf_status == SS_INIT &&
2650               sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
2651                               SF_UPGRADE))))
2652                 rc = osd_scrub_start(dev, SS_AUTO_FULL);
2653
2654         if (rc != 0)
2655                 GOTO(cleanup_oi, rc);
2656
2657         /* it is possible that dcache entries may keep objects after they are
2658          * deleted by OSD. While it looks safe this can cause object data to
2659          * stay until umount causing failures in tests calculating free space,
2660          * e.g. replay-ost-single. Since those dcache entries are not used
2661          * anymore let's just free them after use here */
2662         shrink_dcache_sb(sb);
2663
2664         RETURN(0);
2665 cleanup_oi:
2666         osd_oi_fini(info, dev);
2667 cleanup_inode:
2668         iput(scrub->os_inode);
2669         scrub->os_inode = NULL;
2670
2671         return rc;
2672 }
2673
2674 void osd_scrub_cleanup(const struct lu_env *env, struct osd_device *dev)
2675 {
2676         struct osd_scrub *scrub = &dev->od_scrub;
2677
2678         LASSERT(dev->od_otable_it == NULL);
2679
2680         if (scrub->os_inode != NULL) {
2681                 osd_scrub_stop(dev);
2682                 iput(scrub->os_inode);
2683                 scrub->os_inode = NULL;
2684         }
2685         if (dev->od_oi_table != NULL)
2686                 osd_oi_fini(osd_oti_get(env), dev);
2687 }
2688
2689 /* object table based iteration APIs */
2690
2691 static struct dt_it *osd_otable_it_init(const struct lu_env *env,
2692                                        struct dt_object *dt, __u32 attr)
2693 {
2694         enum dt_otable_it_flags flags = attr >> DT_OTABLE_IT_FLAGS_SHIFT;
2695         enum dt_otable_it_valid valid = attr & ~DT_OTABLE_IT_FLAGS_MASK;
2696         struct osd_device      *dev   = osd_dev(dt->do_lu.lo_dev);
2697         struct osd_scrub       *scrub = &dev->od_scrub;
2698         struct osd_otable_it   *it;
2699         __u32                   start = 0;
2700         int                     rc;
2701         ENTRY;
2702
2703         /* od_otable_mutex: prevent curcurrent init/fini */
2704         mutex_lock(&dev->od_otable_mutex);
2705         if (dev->od_otable_it != NULL)
2706                 GOTO(out, it = ERR_PTR(-EALREADY));
2707
2708         OBD_ALLOC_PTR(it);
2709         if (it == NULL)
2710                 GOTO(out, it = ERR_PTR(-ENOMEM));
2711
2712         dev->od_otable_it = it;
2713         it->ooi_dev = dev;
2714         it->ooi_cache.ooc_consumer_idx = -1;
2715         if (flags & DOIF_OUTUSED)
2716                 it->ooi_used_outside = 1;
2717
2718         if (flags & DOIF_RESET)
2719                 start |= SS_RESET;
2720
2721         if (valid & DOIV_ERROR_HANDLE) {
2722                 if (flags & DOIF_FAILOUT)
2723                         start |= SS_SET_FAILOUT;
2724                 else
2725                         start |= SS_CLEAR_FAILOUT;
2726         }
2727
2728         if (valid & DOIV_DRYRUN) {
2729                 if (flags & DOIF_DRYRUN)
2730                         start |= SS_SET_DRYRUN;
2731                 else
2732                         start |= SS_CLEAR_DRYRUN;
2733         }
2734
2735         rc = do_osd_scrub_start(dev, start & ~SS_AUTO_PARTIAL);
2736         if (rc < 0 && rc != -EALREADY) {
2737                 dev->od_otable_it = NULL;
2738                 OBD_FREE_PTR(it);
2739                 GOTO(out, it = ERR_PTR(rc));
2740         }
2741
2742         it->ooi_cache.ooc_pos_preload = scrub->os_pos_current;
2743
2744         GOTO(out, it);
2745
2746 out:
2747         mutex_unlock(&dev->od_otable_mutex);
2748         return (struct dt_it *)it;
2749 }
2750
2751 static void osd_otable_it_fini(const struct lu_env *env, struct dt_it *di)
2752 {
2753         struct osd_otable_it *it  = (struct osd_otable_it *)di;
2754         struct osd_device    *dev = it->ooi_dev;
2755
2756         /* od_otable_mutex: prevent curcurrent init/fini */
2757         mutex_lock(&dev->od_otable_mutex);
2758         do_osd_scrub_stop(&dev->od_scrub);
2759         LASSERT(dev->od_otable_it == it);
2760
2761         dev->od_otable_it = NULL;
2762         mutex_unlock(&dev->od_otable_mutex);
2763         OBD_FREE_PTR(it);
2764 }
2765
2766 static int osd_otable_it_get(const struct lu_env *env,
2767                              struct dt_it *di, const struct dt_key *key)
2768 {
2769         return 0;
2770 }
2771
2772 static void osd_otable_it_put(const struct lu_env *env, struct dt_it *di)
2773 {
2774 }
2775
2776 static inline int
2777 osd_otable_it_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
2778 {
2779         spin_lock(&scrub->os_lock);
2780         if (it->ooi_cache.ooc_pos_preload < scrub->os_pos_current ||
2781             scrub->os_waiting ||
2782             !thread_is_running(&scrub->os_thread))
2783                 it->ooi_waiting = 0;
2784         else
2785                 it->ooi_waiting = 1;
2786         spin_unlock(&scrub->os_lock);
2787
2788         return !it->ooi_waiting;
2789 }
2790
2791 static int osd_otable_it_next(const struct lu_env *env, struct dt_it *di)
2792 {
2793         struct osd_otable_it    *it     = (struct osd_otable_it *)di;
2794         struct osd_device       *dev    = it->ooi_dev;
2795         struct osd_scrub        *scrub  = &dev->od_scrub;
2796         struct osd_otable_cache *ooc    = &it->ooi_cache;
2797         struct ptlrpc_thread    *thread = &scrub->os_thread;
2798         struct l_wait_info       lwi    = { 0 };
2799         int                      rc;
2800         ENTRY;
2801
2802         LASSERT(it->ooi_user_ready);
2803
2804 again:
2805         if (!thread_is_running(thread) && !it->ooi_used_outside)
2806                 RETURN(1);
2807
2808         if (ooc->ooc_cached_items > 0) {
2809                 ooc->ooc_cached_items--;
2810                 ooc->ooc_consumer_idx = (ooc->ooc_consumer_idx + 1) &
2811                                         ~OSD_OTABLE_IT_CACHE_MASK;
2812                 RETURN(0);
2813         }
2814
2815         if (it->ooi_all_cached) {
2816                 l_wait_event(thread->t_ctl_waitq,
2817                              !thread_is_running(thread),
2818                              &lwi);
2819                 RETURN(1);
2820         }
2821
2822         if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
2823                 spin_lock(&scrub->os_lock);
2824                 scrub->os_waiting = 0;
2825                 wake_up_all(&scrub->os_thread.t_ctl_waitq);
2826                 spin_unlock(&scrub->os_lock);
2827         }
2828
2829         if (it->ooi_cache.ooc_pos_preload >= scrub->os_pos_current)
2830                 l_wait_event(thread->t_ctl_waitq,
2831                              osd_otable_it_wakeup(scrub, it),
2832                              &lwi);
2833
2834         if (!thread_is_running(thread) && !it->ooi_used_outside)
2835                 RETURN(1);
2836
2837         rc = osd_otable_it_preload(env, it);
2838         if (rc >= 0)
2839                 goto again;
2840
2841         RETURN(rc);
2842 }
2843
2844 static struct dt_key *osd_otable_it_key(const struct lu_env *env,
2845                                         const struct dt_it *di)
2846 {
2847         return NULL;
2848 }
2849
2850 static int osd_otable_it_key_size(const struct lu_env *env,
2851                                   const struct dt_it *di)
2852 {
2853         return sizeof(__u64);
2854 }
2855
2856 static int osd_otable_it_rec(const struct lu_env *env, const struct dt_it *di,
2857                              struct dt_rec *rec, __u32 attr)
2858 {
2859         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
2860         struct osd_otable_cache *ooc = &it->ooi_cache;
2861
2862         *(struct lu_fid *)rec = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_fid;
2863
2864         /* Filter out Invald FID already. */
2865         LASSERTF(fid_is_sane((struct lu_fid *)rec),
2866                  "Invalid FID "DFID", p_idx = %d, c_idx = %d\n",
2867                  PFID((struct lu_fid *)rec),
2868                  ooc->ooc_producer_idx, ooc->ooc_consumer_idx);
2869
2870         return 0;
2871 }
2872
2873 static __u64 osd_otable_it_store(const struct lu_env *env,
2874                                  const struct dt_it *di)
2875 {
2876         struct osd_otable_it    *it  = (struct osd_otable_it *)di;
2877         struct osd_otable_cache *ooc = &it->ooi_cache;
2878         __u64                    hash;
2879
2880         if (it->ooi_user_ready && ooc->ooc_consumer_idx != -1)
2881                 hash = ooc->ooc_cache[ooc->ooc_consumer_idx].oic_lid.oii_ino;
2882         else
2883                 hash = ooc->ooc_pos_preload;
2884         return hash;
2885 }
2886
2887 /**
2888  * Set the OSD layer iteration start position as the specified hash.
2889  */
2890 static int osd_otable_it_load(const struct lu_env *env,
2891                               const struct dt_it *di, __u64 hash)
2892 {
2893         struct osd_otable_it    *it    = (struct osd_otable_it *)di;
2894         struct osd_device       *dev   = it->ooi_dev;
2895         struct osd_otable_cache *ooc   = &it->ooi_cache;
2896         struct osd_scrub        *scrub = &dev->od_scrub;
2897         int                      rc;
2898         ENTRY;
2899
2900         /* Forbid to set iteration position after iteration started. */
2901         if (it->ooi_user_ready)
2902                 RETURN(-EPERM);
2903
2904         LASSERT(!scrub->os_partial_scan);
2905
2906         if (hash > OSD_OTABLE_MAX_HASH)
2907                 hash = OSD_OTABLE_MAX_HASH;
2908
2909         ooc->ooc_pos_preload = hash;
2910         if (ooc->ooc_pos_preload <= LDISKFS_FIRST_INO(osd_sb(dev)))
2911                 ooc->ooc_pos_preload = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
2912
2913         it->ooi_user_ready = 1;
2914         if (!scrub->os_full_speed)
2915                 wake_up_all(&scrub->os_thread.t_ctl_waitq);
2916
2917         /* Unplug OSD layer iteration by the first next() call. */
2918         rc = osd_otable_it_next(env, (struct dt_it *)it);
2919
2920         RETURN(rc);
2921 }
2922
2923 static int osd_otable_it_key_rec(const struct lu_env *env,
2924                                  const struct dt_it *di, void *key_rec)
2925 {
2926         return 0;
2927 }
2928
2929 const struct dt_index_operations osd_otable_ops = {
2930         .dio_it = {
2931                 .init     = osd_otable_it_init,
2932                 .fini     = osd_otable_it_fini,
2933                 .get      = osd_otable_it_get,
2934                 .put      = osd_otable_it_put,
2935                 .next     = osd_otable_it_next,
2936                 .key      = osd_otable_it_key,
2937                 .key_size = osd_otable_it_key_size,
2938                 .rec      = osd_otable_it_rec,
2939                 .store    = osd_otable_it_store,
2940                 .load     = osd_otable_it_load,
2941                 .key_rec  = osd_otable_it_key_rec,
2942         }
2943 };
2944
2945 /* high priority inconsistent items list APIs */
2946
2947 #define SCRUB_BAD_OIMAP_DECAY_INTERVAL  60
2948
2949 int osd_oii_insert(struct osd_device *dev, struct osd_idmap_cache *oic,
2950                    int insert)
2951 {
2952         struct osd_inconsistent_item *oii;
2953         struct osd_scrub             *scrub  = &dev->od_scrub;
2954         struct ptlrpc_thread         *thread = &scrub->os_thread;
2955         int                           wakeup = 0;
2956         ENTRY;
2957
2958         OBD_ALLOC_PTR(oii);
2959         if (unlikely(oii == NULL))
2960                 RETURN(-ENOMEM);
2961
2962         INIT_LIST_HEAD(&oii->oii_list);
2963         oii->oii_cache = *oic;
2964         oii->oii_insert = insert;
2965
2966         if (scrub->os_partial_scan) {
2967                 __u64 now = cfs_time_current_sec();
2968
2969                 /* If there haven't been errors in a long time,
2970                  * decay old count until either the errors are
2971                  * gone or we reach the current interval. */
2972                 while (unlikely(scrub->os_bad_oimap_count > 0 &&
2973                                 scrub->os_bad_oimap_time +
2974                                 SCRUB_BAD_OIMAP_DECAY_INTERVAL < now)) {
2975                         scrub->os_bad_oimap_count >>= 1;
2976                         scrub->os_bad_oimap_time +=
2977                                 SCRUB_BAD_OIMAP_DECAY_INTERVAL;
2978                 }
2979
2980                 scrub->os_bad_oimap_time = now;
2981                 if (++scrub->os_bad_oimap_count >
2982                     dev->od_full_scrub_threshold_rate)
2983                         scrub->os_full_scrub = 1;
2984         }
2985
2986         spin_lock(&scrub->os_lock);
2987         if (unlikely(!thread_is_running(thread))) {
2988                 spin_unlock(&scrub->os_lock);
2989                 OBD_FREE_PTR(oii);
2990                 RETURN(-EAGAIN);
2991         }
2992
2993         if (list_empty(&scrub->os_inconsistent_items))
2994                 wakeup = 1;
2995         list_add_tail(&oii->oii_list, &scrub->os_inconsistent_items);
2996         spin_unlock(&scrub->os_lock);
2997
2998         if (wakeup != 0)
2999                 wake_up_all(&thread->t_ctl_waitq);
3000
3001         RETURN(0);
3002 }
3003
3004 int osd_oii_lookup(struct osd_device *dev, const struct lu_fid *fid,
3005                    struct osd_inode_id *id)
3006 {
3007         struct osd_scrub             *scrub = &dev->od_scrub;
3008         struct osd_inconsistent_item *oii;
3009         ENTRY;
3010
3011         spin_lock(&scrub->os_lock);
3012         list_for_each_entry(oii, &scrub->os_inconsistent_items, oii_list) {
3013                 if (lu_fid_eq(fid, &oii->oii_cache.oic_fid)) {
3014                         *id = oii->oii_cache.oic_lid;
3015                         spin_unlock(&scrub->os_lock);
3016                         RETURN(0);
3017                 }
3018         }
3019         spin_unlock(&scrub->os_lock);
3020
3021         RETURN(-ENOENT);
3022 }
3023
3024 /* OI scrub dump */
3025
3026 static const char *scrub_status_names[] = {
3027         "init",
3028         "scanning",
3029         "completed",
3030         "failed",
3031         "stopped",
3032         "paused",
3033         "crashed",
3034         NULL
3035 };
3036
3037 static const char *scrub_flags_names[] = {
3038         "recreated",
3039         "inconsistent",
3040         "auto",
3041         "upgrade",
3042         NULL
3043 };
3044
3045 static const char *scrub_param_names[] = {
3046         "failout",
3047         "dryrun",
3048         NULL
3049 };
3050
3051 static void scrub_bits_dump(struct seq_file *m, int bits, const char *names[],
3052                             const char *prefix)
3053 {
3054         int flag;
3055         int i;
3056
3057         seq_printf(m, "%s:%c", prefix, bits != 0 ? ' ' : '\n');
3058
3059         for (i = 0, flag = 1; bits != 0; i++, flag = 1 << i) {
3060                 if (flag & bits) {
3061                         bits &= ~flag;
3062                         seq_printf(m, "%s%c", names[i],
3063                                    bits != 0 ? ',' : '\n');
3064                 }
3065         }
3066 }
3067
3068 static void scrub_time_dump(struct seq_file *m, __u64 time, const char *prefix)
3069 {
3070         if (time != 0)
3071                 seq_printf(m, "%s: "LPU64" seconds\n", prefix,
3072                            cfs_time_current_sec() - time);
3073         else
3074                 seq_printf(m, "%s: N/A\n", prefix);
3075 }
3076
3077 static void scrub_pos_dump(struct seq_file *m, __u64 pos, const char *prefix)
3078 {
3079         if (pos != 0)
3080                 seq_printf(m, "%s: "LPU64"\n", prefix, pos);
3081         else
3082                 seq_printf(m, "%s: N/A\n", prefix);
3083 }
3084
3085 int osd_scrub_dump(struct seq_file *m, struct osd_device *dev)
3086 {
3087         struct osd_scrub  *scrub   = &dev->od_scrub;
3088         struct scrub_file *sf      = &scrub->os_file;
3089         __u64              checked;
3090         __u64              speed;
3091
3092         down_read(&scrub->os_rwsem);
3093         seq_printf(m, "name: OI_scrub\n"
3094                    "magic: 0x%x\n"
3095                    "oi_files: %d\n"
3096                    "status: %s\n",
3097                    sf->sf_magic, (int)sf->sf_oi_count,
3098                    scrub_status_names[sf->sf_status]);
3099
3100         scrub_bits_dump(m, sf->sf_flags, scrub_flags_names, "flags");
3101
3102         scrub_bits_dump(m, sf->sf_param, scrub_param_names, "param");
3103
3104         scrub_time_dump(m, sf->sf_time_last_complete,
3105                         "time_since_last_completed");
3106