Whamcloud - gitweb
LU-7268 scrub: NOT assign LMA for EA inode
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_scrub.c
index 299b532..ff639e2 100644 (file)
@@ -20,7 +20,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright (c) 2012, 2013, Intel Corporation.
+ * Copyright (c) 2012, 2015, Intel Corporation.
  */
 /*
  * lustre/osd-ldiskfs/osd_scrub.c
@@ -35,8 +35,9 @@
  * Author: Fan Yong <yong.fan@whamcloud.com>
  */
 
-#define DEBUG_SUBSYSTEM S_MDS
+#define DEBUG_SUBSYSTEM S_LFSCK
 
+#include <linux/kthread.h>
 #include <lustre/lustre_idl.h>
 #include <lustre_disk.h>
 #include <dt_object.h>
@@ -46,7 +47,7 @@
 #include "osd_oi.h"
 #include "osd_scrub.h"
 
-#define HALF_SEC       (CFS_HZ >> 1)
+#define HALF_SEC       msecs_to_jiffies(MSEC_PER_SEC >> 1)
 
 #define OSD_OTABLE_MAX_HASH            0x00000000ffffffffULL
 
@@ -80,6 +81,11 @@ static inline int osd_scrub_has_window(struct osd_scrub *scrub,
        return scrub->os_pos_current < ooc->ooc_pos_preload + SCRUB_WINDOW_SIZE;
 }
 
+static inline const char *osd_scrub2name(struct osd_scrub *scrub)
+{
+       return LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name;
+}
+
 /**
  * update/insert/delete the specified OI mapping (@fid @id) according to the ops
  *
@@ -91,29 +97,30 @@ static int osd_scrub_refresh_mapping(struct osd_thread_info *info,
                                     struct osd_device *dev,
                                     const struct lu_fid *fid,
                                     const struct osd_inode_id *id,
-                                    int ops, enum oi_check_flags flags)
+                                    int ops, bool force,
+                                    enum oi_check_flags flags)
 {
-       const struct lu_env *env = info->oti_env;
-       struct thandle      *th;
-       struct osd_thandle  *oh;
-       int                  rc;
+       handle_t *th;
+       int       rc;
        ENTRY;
 
-       th = dt_trans_create(env, &dev->od_dt_dev);
-       if (IS_ERR(th))
-               RETURN(PTR_ERR(th));
+       if (dev->od_scrub.os_file.sf_param & SP_DRYRUN && !force)
+               RETURN(0);
 
-       oh = container_of0(th, struct osd_thandle, ot_super);
-       LASSERT(oh->ot_handle == NULL);
+       /* DTO_INDEX_INSERT is enough for other two ops:
+        * delete/update, but save stack. */
+       th = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC,
+                               osd_dto_credits_noquota[DTO_INDEX_INSERT]);
+       if (IS_ERR(th)) {
+               rc = PTR_ERR(th);
+               CDEBUG(D_LFSCK, "%s: fail to start trans for scrub op %d "
+                      DFID" => %u/%u: rc = %d\n", osd_name(dev), ops,
+                      PFID(fid), id->oii_ino, id->oii_gen, rc);
+               RETURN(rc);
+       }
 
        switch (ops) {
        case DTO_INDEX_UPDATE:
-               osd_trans_declare_op(env, oh, OSD_OT_UPDATE,
-                                    osd_dto_credits_noquota[DTO_INDEX_UPDATE]);
-               rc = dt_trans_start_local(env, &dev->od_dt_dev, th);
-               if (rc != 0)
-                       GOTO(stop, rc);
-
                rc = osd_oi_update(info, dev, fid, id, th, flags);
                if (unlikely(rc == -ENOENT)) {
                        /* Some unlink thread may removed the OI mapping. */
@@ -121,12 +128,6 @@ static int osd_scrub_refresh_mapping(struct osd_thread_info *info,
                }
                break;
        case DTO_INDEX_INSERT:
-               osd_trans_declare_op(env, oh, OSD_OT_INSERT,
-                                    osd_dto_credits_noquota[DTO_INDEX_INSERT]);
-               rc = dt_trans_start_local(env, &dev->od_dt_dev, th);
-               if (rc != 0)
-                       GOTO(stop, rc);
-
                rc = osd_oi_insert(info, dev, fid, id, th, flags);
                if (unlikely(rc == -EEXIST)) {
                        rc = 1;
@@ -164,12 +165,6 @@ static int osd_scrub_refresh_mapping(struct osd_thread_info *info,
                }
                break;
        case DTO_INDEX_DELETE:
-               osd_trans_declare_op(env, oh, OSD_OT_DELETE,
-                                    osd_dto_credits_noquota[DTO_INDEX_DELETE]);
-               rc = dt_trans_start_local(env, &dev->od_dt_dev, th);
-               if (rc != 0)
-                       GOTO(stop, rc);
-
                rc = osd_oi_delete(info, dev, fid, th, flags);
                if (rc == -ENOENT) {
                        /* It is normal that the unlink thread has removed the
@@ -182,11 +177,14 @@ static int osd_scrub_refresh_mapping(struct osd_thread_info *info,
                break;
        }
 
-       GOTO(stop, rc);
+       ldiskfs_journal_stop(th);
+       if (rc < 0)
+               CDEBUG(D_LFSCK, "%s: fail to refresh OI map for scrub op %d "
+                      DFID" => %u/%u: rc = %d\n", osd_name(dev), ops,
+                      PFID(fid), id ? id->oii_ino : -1, id ? id->oii_gen : -1,
+                      rc);
 
-stop:
-       dt_trans_stop(env, &dev->od_dt_dev, th);
-       return rc;
+       RETURN(rc);
 }
 
 /* OI_scrub file ops */
@@ -275,11 +273,14 @@ void osd_scrub_file_reset(struct osd_scrub *scrub, __u8 *uuid, __u64 flags)
 {
        struct scrub_file *sf = &scrub->os_file;
 
-       CDEBUG(D_LFSCK, "Reset OI scrub file, flags = "LPX64"\n", flags);
+       CDEBUG(D_LFSCK, "%.16s: reset OI scrub file, old flags = "
+              LPX64", add flags = "LPX64"\n",
+              osd_scrub2name(scrub), sf->sf_flags, flags);
+
        memcpy(sf->sf_uuid, uuid, 16);
        sf->sf_status = SS_INIT;
        sf->sf_flags |= flags;
-       sf->sf_param = 0;
+       sf->sf_flags &= ~SF_AUTO;
        sf->sf_run_time = 0;
        sf->sf_time_latest_start = 0;
        sf->sf_time_last_checkpoint = 0;
@@ -289,7 +290,9 @@ void osd_scrub_file_reset(struct osd_scrub *scrub, __u8 *uuid, __u64 flags)
        sf->sf_items_checked = 0;
        sf->sf_items_updated = 0;
        sf->sf_items_failed = 0;
-       sf->sf_items_updated_prior = 0;
+       if (!scrub->os_in_join)
+               sf->sf_items_updated_prior = 0;
+
        sf->sf_items_noscrub = 0;
        sf->sf_items_igif = 0;
 }
@@ -297,7 +300,6 @@ void osd_scrub_file_reset(struct osd_scrub *scrub, __u8 *uuid, __u64 flags)
 static int osd_scrub_file_load(struct osd_scrub *scrub)
 {
        loff_t  pos  = 0;
-       char   *name = LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name;
        int     len  = sizeof(scrub->os_file_disk);
        int     rc;
 
@@ -307,16 +309,18 @@ static int osd_scrub_file_load(struct osd_scrub *scrub)
 
                osd_scrub_file_to_cpu(sf, &scrub->os_file_disk);
                if (sf->sf_magic != SCRUB_MAGIC_V1) {
-                       CWARN("%.16s: invalid scrub magic 0x%x != 0x%x\n,",
-                             name, sf->sf_magic, SCRUB_MAGIC_V1);
+                       CDEBUG(D_LFSCK, "%.16s: invalid scrub magic "
+                              "0x%x != 0x%x\n", osd_scrub2name(scrub),
+                              sf->sf_magic, SCRUB_MAGIC_V1);
                        /* Process it as new scrub file. */
                        rc = -ENOENT;
                } else {
                        rc = 0;
                }
        } else if (rc != 0) {
-               CERROR("%.16s: fail to load scrub file, expected = %d, "
-                      "rc = %d\n", name, len, rc);
+               CDEBUG(D_LFSCK, "%.16s: fail to load scrub file, "
+                      "expected = %d: rc = %d\n",
+                      osd_scrub2name(scrub), len, rc);
                if (rc > 0)
                        rc = -EFAULT;
        } else {
@@ -339,11 +343,11 @@ int osd_scrub_file_store(struct osd_scrub *scrub)
        dev = container_of0(scrub, struct osd_device, od_scrub);
        credits = osd_dto_credits_noquota[DTO_WRITE_BASE] +
                  osd_dto_credits_noquota[DTO_WRITE_BLOCK];
-       jh = ldiskfs_journal_start_sb(osd_sb(dev), credits);
+       jh = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC, credits);
        if (IS_ERR(jh)) {
                rc = PTR_ERR(jh);
-               CERROR("%.16s: fail to start trans for scrub store, rc = %d\n",
-                      LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,rc);
+               CDEBUG(D_LFSCK, "%.16s: fail to start trans for scrub store: "
+                      "rc = %d\n", osd_scrub2name(scrub), rc);
                return rc;
        }
 
@@ -352,79 +356,23 @@ int osd_scrub_file_store(struct osd_scrub *scrub)
                                      len, 0, &pos, jh);
        ldiskfs_journal_stop(jh);
        if (rc != 0)
-               CERROR("%.16s: fail to store scrub file, expected = %d, "
-                      "rc = %d\n",
-                      LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,
-                      len, rc);
+               CDEBUG(D_LFSCK, "%.16s: fail to store scrub file, "
+                      "expected = %d: rc = %d\n",
+                      osd_scrub2name(scrub), len, rc);
+
        scrub->os_time_last_checkpoint = cfs_time_current();
        scrub->os_time_next_checkpoint = scrub->os_time_last_checkpoint +
                                cfs_time_seconds(SCRUB_CHECKPOINT_INTERVAL);
        return rc;
 }
 
-/* OI scrub APIs */
-
-static int osd_scrub_prep(struct osd_device *dev)
-{
-       struct osd_scrub     *scrub  = &dev->od_scrub;
-       struct ptlrpc_thread *thread = &scrub->os_thread;
-       struct scrub_file    *sf     = &scrub->os_file;
-       __u32                 flags  = scrub->os_start_flags;
-       int                   rc;
-       ENTRY;
-
-       down_write(&scrub->os_rwsem);
-       if (flags & SS_SET_FAILOUT)
-               sf->sf_param |= SP_FAILOUT;
-
-       if (flags & SS_CLEAR_FAILOUT)
-               sf->sf_param &= ~SP_FAILOUT;
-
-       if (flags & SS_RESET)
-               osd_scrub_file_reset(scrub,
-                       LDISKFS_SB(osd_sb(dev))->s_es->s_uuid, 0);
-
-       if (flags & SS_AUTO) {
-               scrub->os_full_speed = 1;
-               sf->sf_flags |= SF_AUTO;
-       } else {
-               scrub->os_full_speed = 0;
-       }
-
-       if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT | SF_UPGRADE))
-               scrub->os_full_speed = 1;
-
-       scrub->os_in_prior = 0;
-       scrub->os_waiting = 0;
-       scrub->os_paused = 0;
-       scrub->os_new_checked = 0;
-       if (sf->sf_pos_last_checkpoint != 0)
-               sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
-       else
-               sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
-
-       scrub->os_pos_current = sf->sf_pos_latest_start;
-       sf->sf_status = SS_SCANNING;
-       sf->sf_time_latest_start = cfs_time_current_sec();
-       sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
-       rc = osd_scrub_file_store(scrub);
-       if (rc == 0) {
-               spin_lock(&scrub->os_lock);
-               thread_set_flags(thread, SVC_RUNNING);
-               spin_unlock(&scrub->os_lock);
-               cfs_waitq_broadcast(&thread->t_ctl_waitq);
-       }
-       up_write(&scrub->os_rwsem);
-
-       RETURN(rc);
-}
-
 static int
 osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
                     struct inode *inode, const struct lu_fid *fid)
 {
        struct filter_fid_old   *ff      = &info->oti_ff;
        struct dentry           *dentry  = &info->oti_obj_dentry;
+       struct lu_fid           *tfid    = &info->oti_fid;
        handle_t                *jh;
        int                      size    = 0;
        int                      rc;
@@ -432,6 +380,18 @@ osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
        bool                     reset   = true;
        ENTRY;
 
+       if (dev->od_scrub.os_file.sf_param & SP_DRYRUN)
+               RETURN(0);
+
+       if (fid_is_idif(fid) && dev->od_index_in_idif == 0) {
+               struct ost_id *oi = &info->oti_ostid;
+
+               fid_to_ostid(fid, oi);
+               ostid_to_fid(tfid, oi, 0);
+       } else {
+               *tfid = *fid;
+       }
+
        /* We want the LMA to fit into the 256-byte OST inode, so operate
         * as following:
         * 1) read old XATTR_NAME_FID and save the parent FID;
@@ -442,13 +402,12 @@ osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
         * Making the LMA to fit into the 256-byte OST inode can save time for
         * normal osd_check_lma() and for other OI scrub scanning in future.
         * So it is worth to make some slow conversion here. */
-       jh = ldiskfs_journal_start_sb(osd_sb(dev),
+       jh = osd_journal_start_sb(osd_sb(dev), LDISKFS_HT_MISC,
                                osd_dto_credits_noquota[DTO_XATTR_SET] * 3);
        if (IS_ERR(jh)) {
                rc = PTR_ERR(jh);
-               CERROR("%s: fail to start trans for convert ff: "DFID
-                      ": rc = %d\n",
-                      osd_name(dev), PFID(fid), rc);
+               CDEBUG(D_LFSCK, "%s: fail to start trans for convert ff "
+                      DFID": rc = %d\n", osd_name(dev), PFID(tfid), rc);
                RETURN(rc);
        }
 
@@ -469,7 +428,7 @@ osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
        }
 
        /* 3) make new LMA and add it */
-       rc = osd_ea_fid_set(info, inode, fid, LMAC_FID_ON_OST, 0);
+       rc = osd_ea_fid_set(info, inode, tfid, LMAC_FID_ON_OST, 0);
        if (rc == 0 && reset)
                size = sizeof(struct filter_fid);
        else if (rc != 0 && removed)
@@ -482,7 +441,7 @@ osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
 
                rc1 = __osd_xattr_set(info, inode, XATTR_NAME_FID, ff, size,
                                      XATTR_CREATE);
-               if (rc1 != 0 && rc != 0)
+               if (rc1 != 0 && rc == 0)
                        rc = rc1;
        }
 
@@ -490,6 +449,9 @@ osd_scrub_convert_ff(struct osd_thread_info *info, struct osd_device *dev,
 
 stop:
        ldiskfs_journal_stop(jh);
+       if (rc < 0)
+               CDEBUG(D_LFSCK, "%s: fail to convert ff "DFID": rc = %d\n",
+                      osd_name(dev), PFID(tfid), rc);
        return rc;
 }
 
@@ -516,8 +478,8 @@ osd_scrub_check_update(struct osd_thread_info *info, struct osd_device *dev,
                GOTO(out, rc = val);
 
        if (scrub->os_in_prior)
-               oii = cfs_list_entry(oic, struct osd_inconsistent_item,
-                                    oii_cache);
+               oii = list_entry(oic, struct osd_inconsistent_item,
+                                oii_cache);
 
        if (lid->oii_ino < sf->sf_pos_latest_start && oii == NULL)
                GOTO(out, rc = 0);
@@ -535,12 +497,14 @@ osd_scrub_check_update(struct osd_thread_info *info, struct osd_device *dev,
                        GOTO(out, rc);
                }
 
+               /* The inode has been reused as EA inode, ignore it. */
+               if (unlikely(osd_is_ea_inode(inode)))
+                       GOTO(out, rc = 0);
+
                sf->sf_flags |= SF_UPGRADE;
                sf->sf_internal_flags &= ~SIF_NO_HANDLE_OLD_FID;
                dev->od_check_ff = 1;
                rc = osd_scrub_convert_ff(info, dev, inode, fid);
-               rc = osd_ea_fid_set(info, inode, fid,
-                                   LMAC_FID_ON_OST, 0);
                if (rc != 0)
                        GOTO(out, rc);
 
@@ -551,14 +515,19 @@ osd_scrub_check_update(struct osd_thread_info *info, struct osd_device *dev,
            (!scrub->os_convert_igif || OBD_FAIL_CHECK(OBD_FAIL_FID_NOLMA)))
                GOTO(out, rc = 0);
 
-       if ((oii != NULL && oii->oii_insert) || (val == SCRUB_NEXT_NOLMA))
+       if ((oii != NULL && oii->oii_insert) || (val == SCRUB_NEXT_NOLMA)) {
+               ops = DTO_INDEX_INSERT;
+
                goto iget;
+       }
 
        rc = osd_oi_lookup(info, dev, fid, lid2,
                (val == SCRUB_NEXT_OSTOBJ ||
                 val == SCRUB_NEXT_OSTOBJ_OLD) ? OI_KNOWN_ON_OST : 0);
        if (rc != 0) {
-               if (rc != -ENOENT)
+               if (rc == -ENOENT)
+                       ops = DTO_INDEX_INSERT;
+               else if (rc != -ESTALE)
                        GOTO(out, rc);
 
 iget:
@@ -571,17 +540,24 @@ iget:
                                        rc = 0;
                                GOTO(out, rc);
                        }
+
+                       /* The inode has been reused as EA inode, ignore it. */
+                       if (unlikely(osd_is_ea_inode(inode)))
+                               GOTO(out, rc = 0);
                }
 
-               scrub->os_full_speed = 1;
-               ops = DTO_INDEX_INSERT;
+               if (!scrub->os_partial_scan)
+                       scrub->os_full_speed = 1;
+
                idx = osd_oi_fid2idx(dev, fid);
                switch (val) {
                case SCRUB_NEXT_NOLMA:
                        sf->sf_flags |= SF_UPGRADE;
-                       rc = osd_ea_fid_set(info, inode, fid, 0, 0);
-                       if (rc != 0)
-                               GOTO(out, rc);
+                       if (!(sf->sf_param & SP_DRYRUN)) {
+                               rc = osd_ea_fid_set(info, inode, fid, 0, 0);
+                               if (rc != 0)
+                                       GOTO(out, rc);
+                       }
 
                        if (!(sf->sf_flags & SF_INCONSISTENT))
                                dev->od_igif_inoi = 0;
@@ -602,7 +578,9 @@ iget:
 
                GOTO(out, rc = 0);
        } else {
-               scrub->os_full_speed = 1;
+               if (!scrub->os_partial_scan)
+                       scrub->os_full_speed = 1;
+
                sf->sf_flags |= SF_INCONSISTENT;
 
                /* XXX: If the device is restored from file-level backup, then
@@ -620,7 +598,7 @@ iget:
                dev->od_igif_inoi = 1;
        }
 
-       rc = osd_scrub_refresh_mapping(info, dev, fid, lid, ops,
+       rc = osd_scrub_refresh_mapping(info, dev, fid, lid, ops, false,
                        (val == SCRUB_NEXT_OSTOBJ ||
                         val == SCRUB_NEXT_OSTOBJ_OLD) ? OI_KNOWN_ON_OST : 0);
        if (rc == 0) {
@@ -628,9 +606,6 @@ iget:
                        sf->sf_items_updated_prior++;
                else
                        sf->sf_items_updated++;
-
-               /* The target has been changed, need to be re-loaded. */
-               lu_object_purge(info->oti_env, osd2lu_dev(dev), fid);
        }
 
        GOTO(out, rc);
@@ -648,9 +623,10 @@ out:
        /* There may be conflict unlink during the OI scrub,
         * if happend, then remove the new added OI mapping. */
        if (ops == DTO_INDEX_INSERT && inode != NULL && !IS_ERR(inode) &&
-           unlikely(inode->i_nlink == 0))
+           unlikely(ldiskfs_test_inode_state(inode,
+                                             LDISKFS_STATE_LUSTRE_DESTROY)))
                osd_scrub_refresh_mapping(info, dev, fid, lid,
-                               DTO_INDEX_DELETE,
+                               DTO_INDEX_DELETE, false,
                                (val == SCRUB_NEXT_OSTOBJ ||
                                 val == SCRUB_NEXT_OSTOBJ_OLD) ?
                                OI_KNOWN_ON_OST : 0);
@@ -660,16 +636,95 @@ out:
                iput(inode);
 
        if (oii != NULL) {
-               LASSERT(!cfs_list_empty(&oii->oii_list));
+               LASSERT(list_empty(&oii->oii_list));
 
-               spin_lock(&scrub->os_lock);
-               cfs_list_del_init(&oii->oii_list);
-               spin_unlock(&scrub->os_lock);
                OBD_FREE_PTR(oii);
        }
+
        RETURN(sf->sf_param & SP_FAILOUT ? rc : 0);
 }
 
+/* OI scrub APIs */
+
+static int osd_scrub_prep(struct osd_device *dev)
+{
+       struct osd_scrub     *scrub  = &dev->od_scrub;
+       struct ptlrpc_thread *thread = &scrub->os_thread;
+       struct scrub_file    *sf     = &scrub->os_file;
+       __u32                 flags  = scrub->os_start_flags;
+       int                   rc;
+       bool                  drop_dryrun = false;
+       ENTRY;
+
+       CDEBUG(D_LFSCK, "%.16s: OI scrub prep, flags = 0x%x\n",
+              osd_scrub2name(scrub), flags);
+
+       down_write(&scrub->os_rwsem);
+       if (flags & SS_SET_FAILOUT)
+               sf->sf_param |= SP_FAILOUT;
+       else if (flags & SS_CLEAR_FAILOUT)
+               sf->sf_param &= ~SP_FAILOUT;
+
+       if (flags & SS_SET_DRYRUN) {
+               sf->sf_param |= SP_DRYRUN;
+       } else if (flags & SS_CLEAR_DRYRUN && sf->sf_param & SP_DRYRUN) {
+               sf->sf_param &= ~SP_DRYRUN;
+               drop_dryrun = true;
+       }
+
+       if (flags & SS_RESET)
+               osd_scrub_file_reset(scrub,
+                       LDISKFS_SB(osd_sb(dev))->s_es->s_uuid, 0);
+
+       if (flags & SS_AUTO_FULL) {
+               scrub->os_full_speed = 1;
+               scrub->os_partial_scan = 0;
+               sf->sf_flags |= SF_AUTO;
+       } else if (flags & SS_AUTO_PARTIAL) {
+               scrub->os_full_speed = 0;
+               scrub->os_partial_scan = 1;
+               sf->sf_flags |= SF_AUTO;
+       } else if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
+                                  SF_UPGRADE)) {
+               scrub->os_full_speed = 1;
+               scrub->os_partial_scan = 0;
+       } else {
+               scrub->os_full_speed = 0;
+               scrub->os_partial_scan = 0;
+       }
+
+       spin_lock(&scrub->os_lock);
+       scrub->os_in_prior = 0;
+       scrub->os_waiting = 0;
+       scrub->os_paused = 0;
+       scrub->os_in_join = 0;
+       scrub->os_full_scrub = 0;
+       spin_unlock(&scrub->os_lock);
+       scrub->os_new_checked = 0;
+       if (drop_dryrun && sf->sf_pos_first_inconsistent != 0)
+               sf->sf_pos_latest_start = sf->sf_pos_first_inconsistent;
+       else if (sf->sf_pos_last_checkpoint != 0)
+               sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
+       else
+               sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
+
+       scrub->os_pos_current = sf->sf_pos_latest_start;
+       sf->sf_status = SS_SCANNING;
+       sf->sf_time_latest_start = cfs_time_current_sec();
+       sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
+       sf->sf_pos_last_checkpoint = sf->sf_pos_latest_start - 1;
+       rc = osd_scrub_file_store(scrub);
+       if (rc == 0) {
+               spin_lock(&scrub->os_lock);
+               thread_set_flags(thread, SVC_RUNNING);
+               spin_unlock(&scrub->os_lock);
+               wake_up_all(&thread->t_ctl_waitq);
+       }
+       up_write(&scrub->os_rwsem);
+
+       RETURN(rc);
+}
+
 static int osd_scrub_checkpoint(struct osd_scrub *scrub)
 {
        struct scrub_file *sf = &scrub->os_file;
@@ -693,11 +748,15 @@ static int osd_scrub_checkpoint(struct osd_scrub *scrub)
        return rc;
 }
 
-static void osd_scrub_post(struct osd_scrub *scrub, int result)
+static int osd_scrub_post(struct osd_scrub *scrub, int result)
 {
        struct scrub_file *sf = &scrub->os_file;
+       int rc;
        ENTRY;
 
+       CDEBUG(D_LFSCK, "%.16s: OI scrub post, result = %d\n",
+              osd_scrub2name(scrub), result);
+
        down_write(&scrub->os_rwsem);
        spin_lock(&scrub->os_lock);
        thread_set_flags(&scrub->os_thread, SVC_STOPPING);
@@ -715,9 +774,11 @@ static void osd_scrub_post(struct osd_scrub *scrub, int result)
                dev->od_igif_inoi = 1;
                dev->od_check_ff = 0;
                sf->sf_status = SS_COMPLETED;
-               memset(sf->sf_oi_bitmap, 0, SCRUB_OI_BITMAP_SIZE);
-               sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
-                                 SF_UPGRADE | SF_AUTO);
+               if (!(sf->sf_param & SP_DRYRUN)) {
+                       memset(sf->sf_oi_bitmap, 0, SCRUB_OI_BITMAP_SIZE);
+                       sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
+                                         SF_UPGRADE | SF_AUTO);
+               }
                sf->sf_time_last_complete = sf->sf_time_last_checkpoint;
                sf->sf_success_count++;
        } else if (result == 0) {
@@ -730,14 +791,10 @@ static void osd_scrub_post(struct osd_scrub *scrub, int result)
        }
        sf->sf_run_time += cfs_duration_sec(cfs_time_current() + HALF_SEC -
                                            scrub->os_time_last_checkpoint);
-       result = osd_scrub_file_store(scrub);
-       if (result < 0)
-               CERROR("%.16s: fail to osd_scrub_post, rc = %d\n",
-                      LDISKFS_SB(osd_scrub2sb(scrub))->s_es->s_volume_name,
-                      result);
+       rc = osd_scrub_file_store(scrub);
        up_write(&scrub->os_rwsem);
 
-       EXIT;
+       RETURN(rc < 0 ? rc : result);
 }
 
 /* iteration engine */
@@ -754,13 +811,13 @@ typedef int (*osd_iit_next_policy)(struct osd_thread_info *info,
                                   struct osd_device *dev,
                                   struct osd_iit_param *param,
                                   struct osd_idmap_cache **oic,
-                                  int noslot);
+                                  const bool noslot);
 
 typedef int (*osd_iit_exec_policy)(struct osd_thread_info *info,
                                   struct osd_device *dev,
                                   struct osd_iit_param *param,
                                   struct osd_idmap_cache *oic,
-                                  int *noslot, int rc);
+                                  bool *noslot, int rc);
 
 static int osd_iit_next(struct osd_iit_param *param, __u32 *pos)
 {
@@ -787,7 +844,10 @@ static int osd_scrub_check_local_fldb(struct osd_thread_info *info,
         *      a small local FLDB according to the <seq>. If the given FID
         *      is in the local FLDB, then it is FID-on-OST; otherwise it's
         *      quite possible for FID-on-MDT. */
-       return 0;
+       if (dev->od_is_ost)
+               return SCRUB_NEXT_OSTOBJ_OLD;
+       else
+               return 0;
 }
 
 static int osd_scrub_get_fid(struct osd_thread_info *info,
@@ -801,36 +861,31 @@ static int osd_scrub_get_fid(struct osd_thread_info *info,
        rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
        if (rc == 0) {
                has_lma = true;
-               if (lma->lma_compat & LMAC_NOT_IN_OI) {
-                       ldiskfs_set_inode_state(inode,
-                                               LDISKFS_STATE_LUSTRE_NO_OI);
+               if (lma->lma_compat & LMAC_NOT_IN_OI ||
+                   lma->lma_incompat & LMAI_AGENT)
                        return SCRUB_NEXT_CONTINUE;
-               }
 
                *fid = lma->lma_self_fid;
-               if (fid_is_internal(&lma->lma_self_fid)) {
-                       if (!scrub)
-                               rc = SCRUB_NEXT_CONTINUE;
-                       return rc;
-               }
-
                if (!scrub)
                        return 0;
 
-               if (fid_is_namespace_visible(fid) && !fid_is_norm(fid))
-                       return 0;
-
                if (lma->lma_compat & LMAC_FID_ON_OST)
                        return SCRUB_NEXT_OSTOBJ;
 
-               if (fid_is_idif(fid) || fid_is_last_id(fid))
+               if (fid_is_idif(fid))
                        return SCRUB_NEXT_OSTOBJ_OLD;
 
-               if (lma->lma_incompat & LMAI_AGENT)
-                       return SCRUB_NEXT_CONTINUE;
+               /* For local object. */
+               if (fid_is_internal(fid))
+                       return 0;
+
+               /* For external visible MDT-object with non-normal FID. */
+               if (fid_is_namespace_visible(fid) && !fid_is_norm(fid))
+                       return 0;
 
-               /* Here, it may be MDT-object, or may be 2.4 OST-object.
-                * Fall through. */
+               /* For the object with normal FID, it may be MDT-object,
+                * or may be 2.4 OST-object, need further distinguish.
+                * Fall through to next section. */
        }
 
        if (rc == -ENODATA || rc == 0) {
@@ -890,6 +945,12 @@ static int osd_iit_iget(struct osd_thread_info *info, struct osd_device *dev,
        int           rc;
        ENTRY;
 
+       /* Not handle the backend root object and agent parent object.
+        * They are neither visible to namespace nor have OI mappings. */
+       if (unlikely(pos == osd_sb(dev)->s_root->d_inode->i_ino ||
+                    pos == osd_remote_parent_ino(dev)))
+               RETURN(SCRUB_NEXT_CONTINUE);
+
        osd_id_gen(lid, pos, OSD_OII_NOGEN);
        inode = osd_iget(info, dev, lid);
        if (IS_ERR(inode)) {
@@ -899,14 +960,14 @@ static int osd_iit_iget(struct osd_thread_info *info, struct osd_device *dev,
                if (rc == -ENOENT || rc == -ESTALE)
                        RETURN(SCRUB_NEXT_CONTINUE);
 
-               CERROR("%.16s: fail to read inode, ino# = %u, rc = %d\n",
-                      LDISKFS_SB(sb)->s_es->s_volume_name, pos, rc);
+               CDEBUG(D_LFSCK, "%.16s: fail to read inode, ino# = %u: "
+                      "rc = %d\n", LDISKFS_SB(sb)->s_es->s_volume_name,
+                      pos, rc);
                RETURN(rc);
        }
 
-       /* If the inode has no OI mapping, then it is special locally used,
-        * should be invisible to OI scrub or up layer LFSCK. */
-       if (ldiskfs_test_inode_state(inode, LDISKFS_STATE_LUSTRE_NO_OI))
+       /* It is an EA inode, no OI mapping for it, skip it. */
+       if (osd_is_ea_inode(inode))
                GOTO(put, rc = SCRUB_NEXT_CONTINUE);
 
        if (scrub &&
@@ -927,7 +988,7 @@ put:
 
 static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
                          struct osd_iit_param *param,
-                         struct osd_idmap_cache **oic, int noslot)
+                         struct osd_idmap_cache **oic, const bool noslot)
 {
        struct osd_scrub     *scrub  = &dev->od_scrub;
        struct ptlrpc_thread *thread = &scrub->os_thread;
@@ -939,10 +1000,11 @@ static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
                struct l_wait_info lwi;
 
                lwi = LWI_TIMEOUT(cfs_time_seconds(cfs_fail_val), NULL, NULL);
-               l_wait_event(thread->t_ctl_waitq,
-                            !cfs_list_empty(&scrub->os_inconsistent_items) ||
-                            !thread_is_running(thread),
-                            &lwi);
+               if (likely(lwi.lwi_timeout > 0))
+                       l_wait_event(thread->t_ctl_waitq,
+                               !list_empty(&scrub->os_inconsistent_items) ||
+                               !thread_is_running(thread),
+                               &lwi);
        }
 
        if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_CRASH)) {
@@ -958,17 +1020,25 @@ static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
        if (unlikely(!thread_is_running(thread)))
                return SCRUB_NEXT_EXIT;
 
-       if (!cfs_list_empty(&scrub->os_inconsistent_items)) {
-               struct osd_inconsistent_item *oii;
+       if (!list_empty(&scrub->os_inconsistent_items)) {
+               spin_lock(&scrub->os_lock);
+               if (likely(!list_empty(&scrub->os_inconsistent_items))) {
+                       struct osd_inconsistent_item *oii;
 
-               oii = cfs_list_entry(scrub->os_inconsistent_items.next,
-                                    struct osd_inconsistent_item, oii_list);
-               *oic = &oii->oii_cache;
-               scrub->os_in_prior = 1;
-               return 0;
+                       oii = list_entry(scrub->os_inconsistent_items.next,
+                               struct osd_inconsistent_item, oii_list);
+                       list_del_init(&oii->oii_list);
+                       spin_unlock(&scrub->os_lock);
+
+                       *oic = &oii->oii_cache;
+                       scrub->os_in_prior = 1;
+
+                       return 0;
+               }
+               spin_unlock(&scrub->os_lock);
        }
 
-       if (noslot != 0)
+       if (noslot)
                return SCRUB_NEXT_WAIT;
 
        rc = osd_iit_next(param, &scrub->os_pos_current);
@@ -985,7 +1055,7 @@ static int osd_scrub_next(struct osd_thread_info *info, struct osd_device *dev,
 
 static int osd_preload_next(struct osd_thread_info *info,
                            struct osd_device *dev, struct osd_iit_param *param,
-                           struct osd_idmap_cache **oic, int noslot)
+                           struct osd_idmap_cache **oic, const bool noslot)
 {
        struct osd_otable_cache *ooc    = &dev->od_otable_it->ooi_cache;
        struct osd_scrub        *scrub;
@@ -1017,7 +1087,7 @@ osd_scrub_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
 {
        spin_lock(&scrub->os_lock);
        if (osd_scrub_has_window(scrub, &it->ooi_cache) ||
-           !cfs_list_empty(&scrub->os_inconsistent_items) ||
+           !list_empty(&scrub->os_inconsistent_items) ||
            it->ooi_waiting || !thread_is_running(&scrub->os_thread))
                scrub->os_waiting = 0;
        else
@@ -1029,7 +1099,7 @@ osd_scrub_wakeup(struct osd_scrub *scrub, struct osd_otable_it *it)
 
 static int osd_scrub_exec(struct osd_thread_info *info, struct osd_device *dev,
                          struct osd_iit_param *param,
-                         struct osd_idmap_cache *oic, int *noslot, int rc)
+                         struct osd_idmap_cache *oic, bool *noslot, int rc)
 {
        struct l_wait_info       lwi    = { 0 };
        struct osd_scrub        *scrub  = &dev->od_scrub;
@@ -1052,13 +1122,15 @@ static int osd_scrub_exec(struct osd_thread_info *info, struct osd_device *dev,
        }
 
        rc = osd_scrub_check_update(info, dev, oic, rc);
-       if (rc != 0)
+       if (rc != 0) {
+               scrub->os_in_prior = 0;
                return rc;
+       }
 
        rc = osd_scrub_checkpoint(scrub);
        if (rc != 0) {
-               CERROR("%.16s: fail to checkpoint, pos = %u, rc = %d\n",
-                      LDISKFS_SB(param->sb)->s_es->s_volume_name,
+               CDEBUG(D_LFSCK, "%.16s: fail to checkpoint, pos = %u: "
+                      "rc = %d\n", osd_scrub2name(scrub),
                       scrub->os_pos_current, rc);
                /* Continue, as long as the scrub itself can go ahead. */
        }
@@ -1072,36 +1144,36 @@ next:
        scrub->os_pos_current = param->gbase + ++(param->offset);
 
 wait:
-       if (it != NULL && it->ooi_waiting &&
+       if (it != NULL && it->ooi_waiting && ooc != NULL &&
            ooc->ooc_pos_preload < scrub->os_pos_current) {
                spin_lock(&scrub->os_lock);
                it->ooi_waiting = 0;
-               cfs_waitq_broadcast(&thread->t_ctl_waitq);
+               wake_up_all(&thread->t_ctl_waitq);
                spin_unlock(&scrub->os_lock);
        }
 
        if (scrub->os_full_speed || rc == SCRUB_NEXT_CONTINUE)
                return 0;
 
-       if (osd_scrub_has_window(scrub, ooc)) {
-               *noslot = 0;
+       if (ooc != NULL && osd_scrub_has_window(scrub, ooc)) {
+               *noslot = false;
                return 0;
        }
 
-       l_wait_event(thread->t_ctl_waitq,
-                    osd_scrub_wakeup(scrub, it),
-                    &lwi);
+       if (it != NULL)
+               l_wait_event(thread->t_ctl_waitq, osd_scrub_wakeup(scrub, it),
+                            &lwi);
 
-       if (osd_scrub_has_window(scrub, ooc))
-               *noslot = 0;
+       if (ooc != NULL && osd_scrub_has_window(scrub, ooc))
+               *noslot = false;
        else
-               *noslot = 1;
+               *noslot = true;
        return 0;
 }
 
 static int osd_preload_exec(struct osd_thread_info *info,
                            struct osd_device *dev, struct osd_iit_param *param,
-                           struct osd_idmap_cache *oic, int *noslot, int rc)
+                           struct osd_idmap_cache *oic, bool *noslot, int rc)
 {
        struct osd_otable_cache *ooc = &dev->od_otable_it->ooi_cache;
 
@@ -1116,22 +1188,182 @@ static int osd_preload_exec(struct osd_thread_info *info,
 #define SCRUB_IT_ALL   1
 #define SCRUB_IT_CRASH 2
 
+static void osd_scrub_join(struct osd_device *dev, __u32 flags,
+                          bool inconsistent)
+{
+       struct osd_scrub     *scrub  = &dev->od_scrub;
+       struct ptlrpc_thread *thread = &scrub->os_thread;
+       struct scrub_file    *sf     = &scrub->os_file;
+       int                   rc;
+       ENTRY;
+
+       LASSERT(!(flags & SS_AUTO_PARTIAL));
+
+       down_write(&scrub->os_rwsem);
+       scrub->os_in_join = 1;
+       if (flags & SS_SET_FAILOUT)
+               sf->sf_param |= SP_FAILOUT;
+       else if (flags & SS_CLEAR_FAILOUT)
+               sf->sf_param &= ~SP_FAILOUT;
+
+       if (flags & SS_SET_DRYRUN)
+               sf->sf_param |= SP_DRYRUN;
+       else if (flags & SS_CLEAR_DRYRUN)
+               sf->sf_param &= ~SP_DRYRUN;
+
+       if (flags & SS_RESET) {
+               osd_scrub_file_reset(scrub,
+                       LDISKFS_SB(osd_sb(dev))->s_es->s_uuid,
+                       inconsistent ? SF_INCONSISTENT : 0);
+               sf->sf_status = SS_SCANNING;
+       }
+
+       if (flags & SS_AUTO_FULL) {
+               sf->sf_flags |= SF_AUTO;
+               scrub->os_full_speed = 1;
+       }
+
+       if (sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT | SF_UPGRADE))
+               scrub->os_full_speed = 1;
+       else
+               scrub->os_full_speed = 0;
+
+       scrub->os_new_checked = 0;
+       if (sf->sf_pos_last_checkpoint != 0)
+               sf->sf_pos_latest_start = sf->sf_pos_last_checkpoint + 1;
+       else
+               sf->sf_pos_latest_start = LDISKFS_FIRST_INO(osd_sb(dev)) + 1;
+
+       scrub->os_pos_current = sf->sf_pos_latest_start;
+       sf->sf_time_latest_start = cfs_time_current_sec();
+       sf->sf_time_last_checkpoint = sf->sf_time_latest_start;
+       sf->sf_pos_last_checkpoint = sf->sf_pos_latest_start - 1;
+       rc = osd_scrub_file_store(scrub);
+       if (rc != 0)
+               CDEBUG(D_LFSCK, "%.16s: fail to store scrub file when join "
+                      "the OI scrub: rc = %d\n", osd_scrub2name(scrub), rc);
+
+       spin_lock(&scrub->os_lock);
+       scrub->os_waiting = 0;
+       scrub->os_paused = 0;
+       scrub->os_partial_scan = 0;
+       scrub->os_in_join = 0;
+       scrub->os_full_scrub = 0;
+       spin_unlock(&scrub->os_lock);
+       wake_up_all(&thread->t_ctl_waitq);
+       up_write(&scrub->os_rwsem);
+
+       EXIT;
+}
+
 static int osd_inode_iteration(struct osd_thread_info *info,
                               struct osd_device *dev, __u32 max, bool preload)
 {
+       struct osd_scrub     *scrub  = &dev->od_scrub;
+       struct ptlrpc_thread *thread = &scrub->os_thread;
+       struct scrub_file    *sf     = &scrub->os_file;
        osd_iit_next_policy   next;
        osd_iit_exec_policy   exec;
        __u32                *pos;
        __u32                *count;
-       struct osd_iit_param  param;
+       struct osd_iit_param  param  = { NULL };
+       struct l_wait_info    lwi    = { 0 };
        __u32                 limit;
-       int                   noslot = 0;
        int                   rc;
+       bool                  noslot = true;
        ENTRY;
 
+       param.sb = osd_sb(dev);
+       if (preload)
+               goto full;
+
+       while (scrub->os_partial_scan && !scrub->os_in_join) {
+               struct osd_idmap_cache *oic = NULL;
+
+               rc = osd_scrub_next(info, dev, &param, &oic, noslot);
+               switch (rc) {
+               case SCRUB_NEXT_EXIT:
+                       RETURN(0);
+               case SCRUB_NEXT_CRASH:
+                       RETURN(SCRUB_IT_CRASH);
+               case SCRUB_NEXT_FATAL:
+                       RETURN(-EINVAL);
+               case SCRUB_NEXT_WAIT: {
+                       struct kstatfs *ksfs = &info->oti_ksfs;
+                       __u64 saved_flags;
+
+                       if (dev->od_full_scrub_ratio == OFSR_NEVER ||
+                           unlikely(sf->sf_items_updated_prior == 0))
+                               goto wait;
+
+                       if (dev->od_full_scrub_ratio == OFSR_DIRECTLY ||
+                           scrub->os_full_scrub) {
+                               osd_scrub_join(dev, SS_AUTO_FULL | SS_RESET,
+                                              true);
+                               goto full;
+                       }
+
+                       rc = param.sb->s_op->statfs(param.sb->s_root, ksfs);
+                       if (rc == 0) {
+                               __u64 used = ksfs->f_files - ksfs->f_ffree;
+
+                               do_div(used, sf->sf_items_updated_prior);
+                               /* If we hit too much inconsistent OI
+                                * mappings during the partial scan,
+                                * then scan the device completely. */
+                               if (used < dev->od_full_scrub_ratio) {
+                                       osd_scrub_join(dev,
+                                               SS_AUTO_FULL | SS_RESET, true);
+                                       goto full;
+                               }
+                       }
+
+wait:
+                       if (OBD_FAIL_CHECK(OBD_FAIL_OSD_SCRUB_DELAY) &&
+                           cfs_fail_val > 0)
+                               continue;
+
+                       saved_flags = sf->sf_flags;
+                       sf->sf_flags &= ~(SF_RECREATED | SF_INCONSISTENT |
+                                         SF_UPGRADE | SF_AUTO);
+                       sf->sf_status = SS_COMPLETED;
+                       l_wait_event(thread->t_ctl_waitq,
+                                    !thread_is_running(thread) ||
+                                    !scrub->os_partial_scan ||
+                                    scrub->os_in_join ||
+                                    !list_empty(&scrub->os_inconsistent_items),
+                                    &lwi);
+                       sf->sf_flags = saved_flags;
+                       sf->sf_status = SS_SCANNING;
+
+                       if (unlikely(!thread_is_running(thread)))
+                               RETURN(0);
+
+                       if (!scrub->os_partial_scan || scrub->os_in_join)
+                               goto full;
+
+                       continue;
+               }
+               default:
+                       LASSERTF(rc == 0, "rc = %d\n", rc);
+
+                       osd_scrub_exec(info, dev, &param, oic, &noslot, rc);
+                       break;
+               }
+       }
+
+full:
        if (!preload) {
-               struct osd_scrub *scrub = &dev->od_scrub;
+               l_wait_event(thread->t_ctl_waitq,
+                            !thread_is_running(thread) || !scrub->os_in_join,
+                            &lwi);
 
+               if (unlikely(!thread_is_running(thread)))
+                       RETURN(0);
+       }
+
+       noslot = false;
+       if (!preload) {
                next = osd_scrub_next;
                exec = osd_scrub_exec;
                pos = &scrub->os_pos_current;
@@ -1144,26 +1376,43 @@ static int osd_inode_iteration(struct osd_thread_info *info,
                pos = &ooc->ooc_pos_preload;
                count = &ooc->ooc_cached_items;
        }
-       param.sb = osd_sb(dev);
        limit = le32_to_cpu(LDISKFS_SB(param.sb)->s_es->s_inodes_count);
 
        while (*pos <= limit && *count < max) {
                struct osd_idmap_cache *oic = NULL;
+               struct ldiskfs_group_desc *desc;
 
                param.bg = (*pos - 1) / LDISKFS_INODES_PER_GROUP(param.sb);
+               desc = ldiskfs_get_group_desc(param.sb, param.bg, NULL);
+               if (desc == NULL)
+                       RETURN(-EIO);
+
+               ldiskfs_lock_group(param.sb, param.bg);
+               if (desc->bg_flags & cpu_to_le16(LDISKFS_BG_INODE_UNINIT)) {
+                       ldiskfs_unlock_group(param.sb, param.bg);
+                       *pos = 1 + (param.bg + 1) *
+                               LDISKFS_INODES_PER_GROUP(param.sb);
+                       continue;
+               }
+               ldiskfs_unlock_group(param.sb, param.bg);
+
                param.offset = (*pos - 1) % LDISKFS_INODES_PER_GROUP(param.sb);
                param.gbase = 1 + param.bg * LDISKFS_INODES_PER_GROUP(param.sb);
                param.bitmap = ldiskfs_read_inode_bitmap(param.sb, param.bg);
                if (param.bitmap == NULL) {
-                       CERROR("%.16s: fail to read bitmap for %u, "
+                       CDEBUG(D_LFSCK, "%.16s: fail to read bitmap for %u, "
                               "scrub will stop, urgent mode\n",
-                              LDISKFS_SB(param.sb)->s_es->s_volume_name,
-                              (__u32)param.bg);
+                              osd_scrub2name(scrub), (__u32)param.bg);
                        RETURN(-EIO);
                }
 
                while (param.offset < LDISKFS_INODES_PER_GROUP(param.sb) &&
                       *count < max) {
+                       if (param.offset +
+                               ldiskfs_itable_unused_count(param.sb, desc) >
+                           LDISKFS_INODES_PER_GROUP(param.sb))
+                               goto next_group;
+
                        rc = next(info, dev, &param, &oic, noslot);
                        switch (rc) {
                        case SCRUB_NEXT_BREAK:
@@ -1209,13 +1458,11 @@ static int osd_otable_it_preload(const struct lu_env *env,
        if (rc == SCRUB_IT_ALL)
                it->ooi_all_cached = 1;
 
-       CDEBUG(D_LFSCK, "OSD pre-loaded: max = %u, preload = %u, rc = %d\n",
-              le32_to_cpu(LDISKFS_SB(osd_sb(dev))->s_es->s_inodes_count),
-              ooc->ooc_pos_preload, rc);
-
        if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
+               spin_lock(&scrub->os_lock);
                scrub->os_waiting = 0;
-               cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
+               wake_up_all(&scrub->os_thread.t_ctl_waitq);
+               spin_unlock(&scrub->os_lock);
        }
 
        RETURN(rc < 0 ? rc : ooc->ooc_cached_items);
@@ -1227,25 +1474,24 @@ static int osd_scrub_main(void *args)
        struct osd_device    *dev    = (struct osd_device *)args;
        struct osd_scrub     *scrub  = &dev->od_scrub;
        struct ptlrpc_thread *thread = &scrub->os_thread;
-       struct super_block   *sb     = osd_sb(dev);
        int                   rc;
        ENTRY;
 
        rc = lu_env_init(&env, LCT_LOCAL);
        if (rc != 0) {
-               CERROR("%.16s: OI scrub, fail to init env, rc = %d\n",
-                      LDISKFS_SB(sb)->s_es->s_volume_name, rc);
+               CDEBUG(D_LFSCK, "%.16s: OI scrub fail to init env: rc = %d\n",
+                      osd_scrub2name(scrub), rc);
                GOTO(noenv, rc);
        }
 
        rc = osd_scrub_prep(dev);
        if (rc != 0) {
-               CERROR("%.16s: OI scrub, fail to scrub prep, rc = %d\n",
-                      LDISKFS_SB(sb)->s_es->s_volume_name, rc);
+               CDEBUG(D_LFSCK, "%.16s: OI scrub fail to scrub prep: rc = %d\n",
+                      osd_scrub2name(scrub), rc);
                GOTO(out, rc);
        }
 
-       if (!scrub->os_full_speed) {
+       if (!scrub->os_full_speed && !scrub->os_partial_scan) {
                struct l_wait_info lwi = { 0 };
                struct osd_otable_it *it = dev->od_otable_it;
                struct osd_otable_cache *ooc = &it->ooi_cache;
@@ -1259,8 +1505,9 @@ static int osd_scrub_main(void *args)
                scrub->os_pos_current = ooc->ooc_pos_preload;
        }
 
-       CDEBUG(D_LFSCK, "OI scrub: flags = 0x%x, pos = %u\n",
-              scrub->os_start_flags, scrub->os_pos_current);
+       CDEBUG(D_LFSCK, "%.16s: OI scrub start, flags = 0x%x, pos = %u\n",
+              osd_scrub2name(scrub), scrub->os_start_flags,
+              scrub->os_pos_current);
 
        rc = osd_inode_iteration(osd_oti_get(&env), dev, ~0U, false);
        if (unlikely(rc == SCRUB_IT_CRASH))
@@ -1268,17 +1515,17 @@ static int osd_scrub_main(void *args)
        GOTO(post, rc);
 
 post:
-       osd_scrub_post(scrub, rc);
-       CDEBUG(D_LFSCK, "OI scrub: stop, rc = %d, pos = %u\n",
-              rc, scrub->os_pos_current);
+       rc = osd_scrub_post(scrub, rc);
+       CDEBUG(D_LFSCK, "%.16s: OI scrub: stop, pos = %u: rc = %d\n",
+              osd_scrub2name(scrub), scrub->os_pos_current, rc);
 
 out:
-       while (!cfs_list_empty(&scrub->os_inconsistent_items)) {
+       while (!list_empty(&scrub->os_inconsistent_items)) {
                struct osd_inconsistent_item *oii;
 
-               oii = cfs_list_entry(scrub->os_inconsistent_items.next,
+               oii = list_entry(scrub->os_inconsistent_items.next,
                                     struct osd_inconsistent_item, oii_list);
-               cfs_list_del_init(&oii->oii_list);
+               list_del_init(&oii->oii_list);
                OBD_FREE_PTR(oii);
        }
        lu_env_fini(&env);
@@ -1286,7 +1533,7 @@ out:
 noenv:
        spin_lock(&scrub->os_lock);
        thread_set_flags(thread, SVC_STOPPED);
-       cfs_waitq_broadcast(&thread->t_ctl_waitq);
+       wake_up_all(&thread->t_ctl_waitq);
        spin_unlock(&scrub->os_lock);
        return rc;
 }
@@ -1300,6 +1547,10 @@ static int osd_ios_varfid_fill(void *buf, const char *name, int namelen,
                               loff_t offset, __u64 ino, unsigned d_type);
 static int osd_ios_lf_fill(void *buf, const char *name, int namelen,
                           loff_t offset, __u64 ino, unsigned d_type);
+static int osd_ios_dl_fill(void *buf, const char *name, int namelen,
+                          loff_t offset, __u64 ino, unsigned d_type);
+static int osd_ios_uld_fill(void *buf, const char *name, int namelen,
+                           loff_t offset, __u64 ino, unsigned d_type);
 
 static int
 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
@@ -1317,12 +1568,14 @@ enum osd_lf_flags {
        OLF_HIDE_FID            = 0x0002,
        OLF_SHOW_NAME           = 0x0004,
        OLF_NO_OI               = 0x0008,
+       OLF_IDX_IN_FID          = 0x0010,
 };
 
 struct osd_lf_map {
        char            *olm_name;
        struct lu_fid    olm_fid;
        __u16            olm_flags;
+       __u16            olm_namelen;
        scandir_t        olm_scandir;
        filldir_t        olm_filldir;
 };
@@ -1331,100 +1584,158 @@ struct osd_lf_map {
 static const struct osd_lf_map osd_lf_maps[] = {
        /* CATALOGS */
        { CATLIST, { FID_SEQ_LOCAL_FILE, LLOG_CATALOGS_OID, 0 }, OLF_SHOW_NAME,
-               NULL, NULL },
+               sizeof(CATLIST) - 1, NULL, NULL },
 
        /* CONFIGS */
        { MOUNT_CONFIGS_DIR, { FID_SEQ_LOCAL_FILE, MGS_CONFIGS_OID, 0 },
-               OLF_SCAN_SUBITEMS, osd_ios_general_scan,
-               osd_ios_varfid_fill },
+               OLF_SCAN_SUBITEMS, sizeof(MOUNT_CONFIGS_DIR) - 1,
+               osd_ios_general_scan, osd_ios_varfid_fill },
 
        /* NIDTBL_VERSIONS */
        { MGS_NIDTBL_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
-               osd_ios_general_scan, osd_ios_varfid_fill },
+               sizeof(MGS_NIDTBL_DIR) - 1, osd_ios_general_scan,
+               osd_ios_varfid_fill },
 
        /* PENDING */
-       { "PENDING", { 0, 0, 0 }, 0, NULL, NULL },
+       { "PENDING", { 0, 0, 0 }, 0, sizeof("PENDING") - 1, NULL, NULL },
 
        /* ROOT */
-       { "ROOT", { FID_SEQ_ROOT, 1, 0 },
-               OLF_SCAN_SUBITEMS | OLF_HIDE_FID, osd_ios_ROOT_scan, NULL },
+       { "ROOT", { FID_SEQ_ROOT, FID_OID_ROOT, 0 },
+               OLF_SCAN_SUBITEMS | OLF_HIDE_FID, sizeof("ROOT") - 1,
+               osd_ios_ROOT_scan, NULL },
 
        /* changelog_catalog */
-       { CHANGELOG_CATALOG, { 0, 0, 0 }, 0, NULL, NULL },
+       { CHANGELOG_CATALOG, { 0, 0, 0 }, 0, sizeof(CHANGELOG_CATALOG) - 1,
+               NULL, NULL },
 
        /* changelog_users */
-       { CHANGELOG_USERS, { 0, 0, 0 }, 0, NULL, NULL },
+       { CHANGELOG_USERS, { 0, 0, 0 }, 0, sizeof(CHANGELOG_USERS) - 1,
+               NULL, NULL },
 
        /* fld */
        { "fld", { FID_SEQ_LOCAL_FILE, FLD_INDEX_OID, 0 }, OLF_SHOW_NAME,
-               NULL, NULL },
+               sizeof("fld") - 1, NULL, NULL },
 
        /* last_rcvd */
        { LAST_RCVD, { FID_SEQ_LOCAL_FILE, LAST_RECV_OID, 0 }, OLF_SHOW_NAME,
-               NULL, NULL },
+               sizeof(LAST_RCVD) - 1, NULL, NULL },
 
-       /* lfsck_bookmark */
-       { "lfsck_bookmark", { 0, 0, 0 }, 0, NULL, NULL },
+       /* reply_data */
+       { REPLY_DATA, { FID_SEQ_LOCAL_FILE, REPLY_DATA_OID, 0 }, OLF_SHOW_NAME,
+               sizeof(REPLY_DATA) - 1, NULL, NULL },
 
        /* lov_objid */
        { LOV_OBJID, { FID_SEQ_LOCAL_FILE, MDD_LOV_OBJ_OID, 0 }, OLF_SHOW_NAME,
-               NULL, NULL },
+               sizeof(LOV_OBJID) - 1, NULL, NULL },
 
        /* lov_objseq */
        { LOV_OBJSEQ, { FID_SEQ_LOCAL_FILE, MDD_LOV_OBJ_OSEQ, 0 },
-               OLF_SHOW_NAME, NULL, NULL },
+               OLF_SHOW_NAME, sizeof(LOV_OBJSEQ) - 1, NULL, NULL },
 
        /* quota_master */
-       { QMT_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
+       { QMT_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, sizeof(QMT_DIR) - 1,
                osd_ios_general_scan, osd_ios_varfid_fill },
 
        /* quota_slave */
-       { QSD_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS,
+       { QSD_DIR, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, sizeof(QSD_DIR) - 1,
                osd_ios_general_scan, osd_ios_varfid_fill },
 
        /* seq_ctl */
        { "seq_ctl", { FID_SEQ_LOCAL_FILE, FID_SEQ_CTL_OID, 0 },
-               OLF_SHOW_NAME, NULL, NULL },
+               OLF_SHOW_NAME, sizeof("seq_ctl") - 1, NULL, NULL },
 
        /* seq_srv */
        { "seq_srv", { FID_SEQ_LOCAL_FILE, FID_SEQ_SRV_OID, 0 },
-               OLF_SHOW_NAME, NULL, NULL },
+               OLF_SHOW_NAME, sizeof("seq_srv") - 1, NULL, NULL },
 
        /* health_check */
        { HEALTH_CHECK, { FID_SEQ_LOCAL_FILE, OFD_HEALTH_CHECK_OID, 0 },
-               OLF_SHOW_NAME, NULL, NULL },
+               OLF_SHOW_NAME, sizeof(HEALTH_CHECK) - 1, NULL, NULL },
+
+       /* LFSCK */
+       { LFSCK_DIR, { 0, 0, 0 }, 0, sizeof(LFSCK_DIR) - 1,
+               osd_ios_general_scan, osd_ios_varfid_fill },
+
+       /* lfsck_bookmark */
+       { LFSCK_BOOKMARK, { 0, 0, 0 }, 0, sizeof(LFSCK_BOOKMARK) - 1,
+               NULL, NULL },
+
+       /* lfsck_layout */
+       { LFSCK_LAYOUT, { 0, 0, 0 }, 0, sizeof(LFSCK_LAYOUT) - 1,
+               NULL, NULL },
 
        /* lfsck_namespace */
-       { "lfsck_namespace", { 0, 0, 0 }, 0, NULL, NULL },
+       { LFSCK_NAMESPACE, { 0, 0, 0 }, 0, sizeof(LFSCK_NAMESPACE) - 1,
+               NULL, NULL },
 
        /* OBJECTS, upgrade from old device */
-       { OBJECTS, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, osd_ios_OBJECTS_scan, NULL },
+       { OBJECTS, { 0, 0, 0 }, OLF_SCAN_SUBITEMS, sizeof(OBJECTS) - 1,
+               osd_ios_OBJECTS_scan, NULL },
 
        /* lquota_v2.user, upgrade from old device */
-       { "lquota_v2.user", { 0, 0, 0 }, 0, NULL, NULL },
+       { "lquota_v2.user", { 0, 0, 0 }, 0, sizeof("lquota_v2.user") - 1,
+               NULL, NULL },
 
        /* lquota_v2.group, upgrade from old device */
-       { "lquota_v2.group", { 0, 0, 0 }, 0, NULL, NULL },
+       { "lquota_v2.group", { 0, 0, 0 }, 0, sizeof("lquota_v2.group") - 1,
+               NULL, NULL },
 
        /* LAST_GROUP, upgrade from old device */
        { "LAST_GROUP", { FID_SEQ_LOCAL_FILE, OFD_LAST_GROUP_OID, 0 },
-               OLF_SHOW_NAME, NULL, NULL },
+               OLF_SHOW_NAME, sizeof("LAST_GROUP") - 1, NULL, NULL },
+
+       /* committed batchid for cross-MDT operation */
+       { "BATCHID", { FID_SEQ_LOCAL_FILE, BATCHID_COMMITTED_OID, 0 },
+               OLF_SHOW_NAME, sizeof("BATCHID") - 1, NULL, NULL },
+
+       /* OSP update logs update_log{_dir} use f_seq = FID_SEQ_UPDATE_LOG{_DIR}
+        * and f_oid = index for their log files.  See lu_update_log{_dir}_fid()
+        * for more details. */
+
+       /* update_log */
+       { "update_log", { FID_SEQ_UPDATE_LOG, 0, 0 },
+               OLF_SHOW_NAME | OLF_IDX_IN_FID, sizeof("update_log") - 1,
+               NULL, NULL },
+
+       /* update_log_dir */
+       { "update_log_dir", { FID_SEQ_UPDATE_LOG_DIR, 0, 0 },
+               OLF_SHOW_NAME | OLF_SCAN_SUBITEMS | OLF_IDX_IN_FID,
+               sizeof("update_log_dir") - 1,
+               osd_ios_general_scan, osd_ios_uld_fill },
 
        /* lost+found */
-       { "lost+found", { 0, 0, 0 }, OLF_SCAN_SUBITEMS | OLF_NO_OI,
+       { "lost+found", { FID_SEQ_LOCAL_FILE, OSD_LPF_OID, 0 },
+               OLF_SCAN_SUBITEMS, sizeof("lost+found") - 1,
                osd_ios_general_scan, osd_ios_lf_fill },
 
-       { NULL, { 0, 0, 0 }, 0, NULL, NULL }
+       { NULL, { 0, 0, 0 }, 0, 0, NULL, NULL }
+};
+
+/* Add the new introduced files under .lustre/ in the list in the future. */
+static const struct osd_lf_map osd_dl_maps[] = {
+       /* .lustre/fid */
+       { "fid", { FID_SEQ_DOT_LUSTRE, FID_OID_DOT_LUSTRE_OBF, 0 }, 0,
+               sizeof("fid") - 1, NULL, NULL },
+
+       /* .lustre/lost+found */
+       { "lost+found", { FID_SEQ_DOT_LUSTRE, FID_OID_DOT_LUSTRE_LPF, 0 }, 0,
+               sizeof("lost+found") - 1, NULL, NULL },
+
+       { NULL, { 0, 0, 0 }, 0, 0, NULL, NULL }
 };
 
 struct osd_ios_item {
-       cfs_list_t       oii_list;
+       struct list_head oii_list;
        struct dentry   *oii_dentry;
        scandir_t        oii_scandir;
        filldir_t        oii_filldir;
 };
 
 struct osd_ios_filldir_buf {
+#ifdef HAVE_DIR_CONTEXT
+       /* please keep it as first member */
+       struct dir_context       ctx;
+#endif
        struct osd_thread_info  *oifb_info;
        struct osd_device       *oifb_dev;
        struct dentry           *oifb_dentry;
@@ -1436,7 +1747,19 @@ osd_ios_lookup_one_len(const char *name, struct dentry *parent, int namelen)
        struct dentry *dentry;
 
        dentry = ll_lookup_one_len(name, parent, namelen);
-       if (!IS_ERR(dentry) && dentry->d_inode == NULL) {
+       if (IS_ERR(dentry)) {
+               int rc = PTR_ERR(dentry);
+
+               if (rc != -ENOENT)
+                       CERROR("Fail to find %.*s in %.*s (%lu/%u): rc = %d\n",
+                              namelen, name, parent->d_name.len,
+                              parent->d_name.name, parent->d_inode->i_ino,
+                              parent->d_inode->i_generation, rc);
+
+               return dentry;
+       }
+
+       if (dentry->d_inode == NULL) {
                dput(dentry);
                return ERR_PTR(-ENOENT);
        }
@@ -1449,17 +1772,19 @@ osd_ios_new_item(struct osd_device *dev, struct dentry *dentry,
                 scandir_t scandir, filldir_t filldir)
 {
        struct osd_ios_item *item;
+       ENTRY;
 
        OBD_ALLOC_PTR(item);
        if (item == NULL)
-               return -ENOMEM;
+               RETURN(-ENOMEM);
 
-       CFS_INIT_LIST_HEAD(&item->oii_list);
+       INIT_LIST_HEAD(&item->oii_list);
        item->oii_dentry = dget(dentry);
        item->oii_scandir = scandir;
        item->oii_filldir = filldir;
-       cfs_list_add_tail(&item->oii_list, &dev->od_ios_list);
-       return 0;
+       list_add_tail(&item->oii_list, &dev->od_ios_list);
+
+       RETURN(0);
 }
 
 /**
@@ -1483,18 +1808,32 @@ osd_ios_scan_one(struct osd_thread_info *info, struct osd_device *dev,
        ENTRY;
 
        rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
-       if (rc != 0 && rc != -ENODATA)
+       if (rc != 0 && rc != -ENODATA) {
+               CDEBUG(D_LFSCK, "%s: fail to get lma for init OI scrub: "
+                      "rc = %d\n", osd_name(dev), rc);
+
                RETURN(rc);
+       }
 
        osd_id_gen(id, inode->i_ino, inode->i_generation);
        if (rc == -ENODATA) {
-               if (fid == NULL || fid_is_zero(fid) || flags & OLF_HIDE_FID)
+               if (fid == NULL || fid_is_zero(fid) || flags & OLF_HIDE_FID) {
                        lu_igif_build(&tfid, inode->i_ino, inode->i_generation);
-               else
+               } else {
                        tfid = *fid;
+                       if (flags & OLF_IDX_IN_FID) {
+                               LASSERT(dev->od_index >= 0);
+
+                               tfid.f_oid = dev->od_index;
+                       }
+               }
                rc = osd_ea_fid_set(info, inode, &tfid, 0, 0);
-               if (rc != 0)
+               if (rc != 0) {
+                       CDEBUG(D_LFSCK, "%s: fail to set LMA for init OI "
+                             "scrub: rc = %d\n", osd_name(dev), rc);
+
                        RETURN(rc);
+               }
        } else {
                if (lma->lma_compat & LMAC_NOT_IN_OI)
                        RETURN(0);
@@ -1508,7 +1847,7 @@ osd_ios_scan_one(struct osd_thread_info *info, struct osd_device *dev,
                        RETURN(rc);
 
                rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
-                                              DTO_INDEX_INSERT, 0);
+                                              DTO_INDEX_INSERT, true, 0);
                if (rc > 0)
                        rc = 0;
 
@@ -1528,7 +1867,7 @@ osd_ios_scan_one(struct osd_thread_info *info, struct osd_device *dev,
        }
 
        rc = osd_scrub_refresh_mapping(info, dev, &tfid, id,
-                                      DTO_INDEX_UPDATE, 0);
+                                      DTO_INDEX_UPDATE, true, 0);
        if (rc > 0)
                rc = 0;
 
@@ -1561,7 +1900,7 @@ static int osd_ios_lf_fill(void *buf, const char *name, int namelen,
        scrub->os_lf_scanned++;
        child = osd_ios_lookup_one_len(name, parent, namelen);
        if (IS_ERR(child)) {
-               CWARN("%s: cannot lookup child '%.*s': rc = %d\n",
+               CDEBUG(D_LFSCK, "%s: cannot lookup child '%.*s': rc = %d\n",
                      osd_name(dev), namelen, name, (int)PTR_ERR(child));
                RETURN(0);
        }
@@ -1571,8 +1910,8 @@ static int osd_ios_lf_fill(void *buf, const char *name, int namelen,
                rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
                                      osd_ios_lf_fill);
                if (rc != 0)
-                       CWARN("%s: cannot add child '%.*s': rc = %d\n",
-                             osd_name(dev), namelen, name, rc);
+                       CDEBUG(D_LFSCK, "%s: cannot add child '%.*s': "
+                             "rc = %d\n", osd_name(dev), namelen, name, rc);
                GOTO(put, rc);
        }
 
@@ -1587,8 +1926,9 @@ static int osd_ios_lf_fill(void *buf, const char *name, int namelen,
                               "/lost+found.\n", namelen, name, PFID(fid));
                        scrub->os_lf_repaired++;
                } else {
-                       CWARN("%s: cannot rename for '%.*s' "DFID": rc = %d\n",
-                             osd_name(dev), namelen, name, PFID(fid), rc);
+                       CDEBUG(D_LFSCK, "%s: cannot rename for '%.*s' "
+                              DFID": rc = %d\n",
+                              osd_name(dev), namelen, name, PFID(fid), rc);
                }
        }
 
@@ -1633,6 +1973,71 @@ static int osd_ios_varfid_fill(void *buf, const char *name, int namelen,
        RETURN(rc);
 }
 
+static int osd_ios_dl_fill(void *buf, const char *name, int namelen,
+                          loff_t offset, __u64 ino, unsigned d_type)
+{
+       struct osd_ios_filldir_buf *fill_buf = buf;
+       struct osd_device          *dev      = fill_buf->oifb_dev;
+       const struct osd_lf_map    *map;
+       struct dentry              *child;
+       int                         rc       = 0;
+       ENTRY;
+
+       /* skip any '.' started names */
+       if (name[0] == '.')
+               RETURN(0);
+
+       for (map = osd_dl_maps; map->olm_name != NULL; map++) {
+               if (map->olm_namelen != namelen)
+                       continue;
+
+               if (strncmp(map->olm_name, name, namelen) == 0)
+                       break;
+       }
+
+       if (map->olm_name == NULL)
+               RETURN(0);
+
+       child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
+       if (IS_ERR(child))
+               RETURN(PTR_ERR(child));
+
+       rc = osd_ios_scan_one(fill_buf->oifb_info, dev, child->d_inode,
+                             &map->olm_fid, map->olm_flags);
+       dput(child);
+
+       RETURN(rc);
+}
+
+static int osd_ios_uld_fill(void *buf, const char *name, int namelen,
+                           loff_t offset, __u64 ino, unsigned d_type)
+{
+       struct osd_ios_filldir_buf *fill_buf = buf;
+       struct dentry              *child;
+       struct lu_fid               tfid;
+       int                         rc       = 0;
+       ENTRY;
+
+       /* skip any non-DFID format name */
+       if (name[0] != '[')
+               RETURN(0);
+
+       child = osd_ios_lookup_one_len(name, fill_buf->oifb_dentry, namelen);
+       if (IS_ERR(child))
+               RETURN(PTR_ERR(child));
+
+       /* skip the start '[' */
+       sscanf(&name[1], SFID, RFID(&tfid));
+       if (fid_is_sane(&tfid))
+               rc = osd_ios_scan_one(fill_buf->oifb_info, fill_buf->oifb_dev,
+                                     child->d_inode, &tfid, 0);
+       else
+               rc = -EIO;
+       dput(child);
+
+       RETURN(rc);
+}
+
 static int osd_ios_root_fill(void *buf, const char *name, int namelen,
                             loff_t offset, __u64 ino, unsigned d_type)
 {
@@ -1648,7 +2053,7 @@ static int osd_ios_root_fill(void *buf, const char *name, int namelen,
                RETURN(0);
 
        for (map = osd_lf_maps; map->olm_name != NULL; map++) {
-               if (strlen(map->olm_name) != namelen)
+               if (map->olm_namelen != namelen)
                        continue;
 
                if (strncmp(map->olm_name, name, namelen) == 0)
@@ -1677,8 +2082,14 @@ static int
 osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
                     struct dentry *dentry, filldir_t filldir)
 {
-       struct osd_ios_filldir_buf    buf   = { info, dev, dentry };
-       struct file                  *filp  = &info->oti_it_ea.oie_file;
+       struct osd_ios_filldir_buf    buf   = {
+#ifdef HAVE_DIR_CONTEXT
+                                               .ctx.actor = filldir,
+#endif
+                                               .oifb_info = info,
+                                               .oifb_dev = dev,
+                                               .oifb_dentry = dentry };
+       struct file                  *filp  = &info->oti_file;
        struct inode                 *inode = dentry->d_inode;
        const struct file_operations *fops  = inode->i_fop;
        int                           rc;
@@ -1687,13 +2098,20 @@ osd_ios_general_scan(struct osd_thread_info *info, struct osd_device *dev,
        LASSERT(filldir != NULL);
 
        filp->f_pos = 0;
-       filp->f_dentry = dentry;
+       filp->f_path.dentry = dentry;
        filp->f_mode = FMODE_64BITHASH;
        filp->f_mapping = inode->i_mapping;
        filp->f_op = fops;
        filp->private_data = NULL;
+       set_file_inode(filp, inode);
 
+#ifdef HAVE_DIR_CONTEXT
+       buf.ctx.pos = filp->f_pos;
+       rc = fops->iterate(filp, &buf.ctx);
+       filp->f_pos = buf.ctx.pos;
+#else
        rc = fops->readdir(filp, &buf, filldir);
+#endif
        fops->release(inode, filp);
 
        RETURN(rc);
@@ -1765,6 +2183,9 @@ osd_ios_ROOT_scan(struct osd_thread_info *info, struct osd_device *dev,
                 * to the solution 2). */
                rc = osd_ios_scan_one(info, dev, child->d_inode,
                                      &LU_DOT_LUSTRE_FID, 0);
+               if (rc == 0)
+                       rc = osd_ios_new_item(dev, child, osd_ios_general_scan,
+                                             osd_ios_dl_fill);
                dput(child);
        }
 
@@ -1824,6 +2245,9 @@ static int osd_initial_OI_scrub(struct osd_thread_info *info,
        int                      rc;
        ENTRY;
 
+       /* Lookup IGIF in OI by force for initial OI scrub. */
+       dev->od_igif_inoi = 1;
+
        while (1) {
                rc = scandir(info, dev, dentry, filldir);
                if (item != NULL) {
@@ -1834,12 +2258,12 @@ static int osd_initial_OI_scrub(struct osd_thread_info *info,
                if (rc != 0)
                        break;
 
-               if (cfs_list_empty(&dev->od_ios_list))
+               if (list_empty(&dev->od_ios_list))
                        break;
 
-               item = cfs_list_entry(dev->od_ios_list.next,
-                                     struct osd_ios_item, oii_list);
-               cfs_list_del_init(&item->oii_list);
+               item = list_entry(dev->od_ios_list.next,
+                                 struct osd_ios_item, oii_list);
+               list_del_init(&item->oii_list);
 
                LASSERT(item->oii_scandir != NULL);
                scandir = item->oii_scandir;
@@ -1847,10 +2271,10 @@ static int osd_initial_OI_scrub(struct osd_thread_info *info,
                dentry = item->oii_dentry;
        }
 
-       while (!cfs_list_empty(&dev->od_ios_list)) {
-               item = cfs_list_entry(dev->od_ios_list.next,
-                                     struct osd_ios_item, oii_list);
-               cfs_list_del_init(&item->oii_list);
+       while (!list_empty(&dev->od_ios_list)) {
+               item = list_entry(dev->od_ios_list.next,
+                                 struct osd_ios_item, oii_list);
+               list_del_init(&item->oii_list);
                dput(item->oii_dentry);
                OBD_FREE_PTR(item);
        }
@@ -1871,12 +2295,13 @@ static int osd_initial_OI_scrub(struct osd_thread_info *info,
 
                child = osd_ios_lookup_one_len(map->olm_name,
                                               osd_sb(dev)->s_root,
-                                              strlen(map->olm_name));
+                                              map->olm_namelen);
                if (!IS_ERR(child))
                        dput(child);
                else if (PTR_ERR(child) == -ENOENT)
                        osd_scrub_refresh_mapping(info, dev, &map->olm_fid,
-                                                 NULL, DTO_INDEX_DELETE, 0);
+                                                 NULL, DTO_INDEX_DELETE,
+                                                 true, 0);
                map++;
        }
 
@@ -1909,33 +2334,56 @@ static int do_osd_scrub_start(struct osd_device *dev, __u32 flags)
        struct osd_scrub     *scrub  = &dev->od_scrub;
        struct ptlrpc_thread *thread = &scrub->os_thread;
        struct l_wait_info    lwi    = { 0 };
+       struct task_struct   *task;
        int                   rc;
        ENTRY;
 
-again:
        /* os_lock: sync status between stop and scrub thread */
        spin_lock(&scrub->os_lock);
+
+again:
        if (thread_is_running(thread)) {
                spin_unlock(&scrub->os_lock);
-               RETURN(-EALREADY);
-       } else if (unlikely(thread_is_stopping(thread))) {
+               if (!(scrub->os_file.sf_flags & SF_AUTO) ||
+                    (flags & (SS_AUTO_FULL | SS_AUTO_PARTIAL)))
+                       RETURN(-EALREADY);
+
+               osd_scrub_join(dev, flags, false);
+               spin_lock(&scrub->os_lock);
+               if (!thread_is_running(thread))
+                       goto again;
+
+               spin_unlock(&scrub->os_lock);
+               RETURN(0);
+       }
+
+       if (unlikely(thread_is_stopping(thread))) {
                spin_unlock(&scrub->os_lock);
                l_wait_event(thread->t_ctl_waitq,
                             thread_is_stopped(thread),
                             &lwi);
+               spin_lock(&scrub->os_lock);
                goto again;
        }
        spin_unlock(&scrub->os_lock);
 
-       if (scrub->os_file.sf_status == SS_COMPLETED)
+       if (scrub->os_file.sf_status == SS_COMPLETED) {
+               if (!(flags & SS_SET_FAILOUT))
+                       flags |= SS_CLEAR_FAILOUT;
+
+               if (!(flags & SS_SET_DRYRUN))
+                       flags |= SS_CLEAR_DRYRUN;
+
                flags |= SS_RESET;
+       }
 
        scrub->os_start_flags = flags;
        thread_set_flags(thread, 0);
-       rc = PTR_ERR(kthread_run(osd_scrub_main, dev, "OI_scrub"));
-       if (IS_ERR_VALUE(rc)) {
-               CERROR("%.16s: cannot start iteration thread, rc = %d\n",
-                      LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name, rc);
+       task = kthread_run(osd_scrub_main, dev, "OI_scrub");
+       if (IS_ERR(task)) {
+               rc = PTR_ERR(task);
+               CERROR("%.16s: cannot start iteration thread: rc = %d\n",
+                      osd_scrub2name(scrub), rc);
                RETURN(rc);
        }
 
@@ -1946,14 +2394,14 @@ again:
        RETURN(0);
 }
 
-int osd_scrub_start(struct osd_device *dev)
+int osd_scrub_start(struct osd_device *dev, __u32 flags)
 {
        int rc;
        ENTRY;
 
        /* od_otable_mutex: prevent curcurrent start/stop */
        mutex_lock(&dev->od_otable_mutex);
-       rc = do_osd_scrub_start(dev, SS_AUTO);
+       rc = do_osd_scrub_start(dev, flags);
        mutex_unlock(&dev->od_otable_mutex);
 
        RETURN(rc == -EALREADY ? 0 : rc);
@@ -1969,7 +2417,7 @@ static void do_osd_scrub_stop(struct osd_scrub *scrub)
        if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
                thread_set_flags(thread, SVC_STOPPING);
                spin_unlock(&scrub->os_lock);
-               cfs_waitq_broadcast(&thread->t_ctl_waitq);
+               wake_up_all(&thread->t_ctl_waitq);
                l_wait_event(thread->t_ctl_waitq,
                             thread_is_stopped(thread),
                             &lwi);
@@ -2015,33 +2463,32 @@ int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
        ctxt->pwd = dev->od_mnt->mnt_root;
        ctxt->fs = get_ds();
 
-       cfs_waitq_init(&scrub->os_thread.t_ctl_waitq);
+       init_waitqueue_head(&scrub->os_thread.t_ctl_waitq);
        init_rwsem(&scrub->os_rwsem);
        spin_lock_init(&scrub->os_lock);
-       CFS_INIT_LIST_HEAD(&scrub->os_inconsistent_items);
+       INIT_LIST_HEAD(&scrub->os_inconsistent_items);
 
-       push_ctxt(&saved, ctxt, NULL);
+       push_ctxt(&saved, ctxt);
        filp = filp_open(osd_scrub_name, O_RDWR | O_CREAT, 0644);
        if (IS_ERR(filp)) {
-               pop_ctxt(&saved, ctxt, NULL);
+               pop_ctxt(&saved, ctxt);
                RETURN(PTR_ERR(filp));
        }
 
-       inode = filp->f_dentry->d_inode;
-       ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_NO_OI);
+       inode = filp->f_path.dentry->d_inode;
        /* 'What the @fid is' is not imporatant, because the object
         * has no OI mapping, and only is visible inside the OSD.*/
        lu_igif_build(fid, inode->i_ino, inode->i_generation);
        rc = osd_ea_fid_set(info, inode, fid, LMAC_NOT_IN_OI, 0);
        if (rc != 0) {
-               filp_close(filp, 0);
-               pop_ctxt(&saved, ctxt, NULL);
+               filp_close(filp, NULL);
+               pop_ctxt(&saved, ctxt);
                RETURN(rc);
        }
 
        scrub->os_inode = igrab(inode);
-       filp_close(filp, 0);
-       pop_ctxt(&saved, ctxt, NULL);
+       filp_close(filp, NULL);
+       pop_ctxt(&saved, ctxt);
 
        rc = osd_scrub_file_load(scrub);
        if (rc == -ENOENT) {
@@ -2062,11 +2509,32 @@ int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
                        sf->sf_internal_flags = SIF_NO_HANDLE_OLD_FID;
                dirty = 1;
        } else if (rc != 0) {
-               RETURN(rc);
+               GOTO(cleanup_inode, rc);
        } else {
                if (memcmp(sf->sf_uuid, es->s_uuid, 16) != 0) {
+                       struct obd_uuid *old_uuid;
+                       struct obd_uuid *new_uuid;
+
+                       OBD_ALLOC_PTR(old_uuid);
+                       OBD_ALLOC_PTR(new_uuid);
+                       if (old_uuid == NULL || new_uuid == NULL) {
+                               CERROR("%.16s: UUID has been changed, but"
+                                      "failed to allocate RAM for report\n",
+                                      LDISKFS_SB(sb)->s_es->s_volume_name);
+                       } else {
+                               class_uuid_unparse(sf->sf_uuid, old_uuid);
+                               class_uuid_unparse(es->s_uuid, new_uuid);
+                               CERROR("%.16s: UUID has been changed from "
+                                      "%s to %s\n",
+                                      LDISKFS_SB(sb)->s_es->s_volume_name,
+                                      old_uuid->uuid, new_uuid->uuid);
+                       }
                        osd_scrub_file_reset(scrub, es->s_uuid,SF_INCONSISTENT);
                        dirty = 1;
+                       if (old_uuid != NULL)
+                               OBD_FREE_PTR(old_uuid);
+                       if (new_uuid != NULL)
+                               OBD_FREE_PTR(new_uuid);
                } else if (sf->sf_status == SS_SCANNING) {
                        sf->sf_status = SS_CRASHED;
                        dirty = 1;
@@ -2081,48 +2549,52 @@ int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
        if (dirty != 0) {
                rc = osd_scrub_file_store(scrub);
                if (rc != 0)
-                       RETURN(rc);
+                       GOTO(cleanup_inode, rc);
        }
 
        /* Initialize OI files. */
        rc = osd_oi_init(info, dev);
        if (rc < 0)
-               RETURN(rc);
+               GOTO(cleanup_inode, rc);
 
        rc = osd_initial_OI_scrub(info, dev);
-       if (rc == 0) {
-               if (sf->sf_flags & SF_UPGRADE ||
-                   !(sf->sf_internal_flags & SIF_NO_HANDLE_OLD_FID ||
-                     sf->sf_success_count > 0)) {
-                       dev->od_igif_inoi = 0;
-                       dev->od_check_ff = 1;
-               } else {
-                       dev->od_igif_inoi = 1;
-                       dev->od_check_ff = 0;
-               }
-
-               if (sf->sf_flags & SF_INCONSISTENT)
-                       /* The 'od_igif_inoi' will be set under the
-                        * following cases:
-                        * 1) new created system, or
-                        * 2) restored from file-level backup, or
-                        * 3) the upgrading completed.
-                        *
-                        * The 'od_igif_inoi' may be cleared by OI scrub
-                        * later if found that the system is upgrading. */
-                       dev->od_igif_inoi = 1;
+       if (rc != 0)
+               GOTO(cleanup_oi, rc);
 
-               if (!dev->od_noscrub &&
-                   ((sf->sf_status == SS_PAUSED) ||
-                    (sf->sf_status == SS_CRASHED &&
-                     sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
-                                     SF_UPGRADE | SF_AUTO)) ||
-                    (sf->sf_status == SS_INIT &&
-                     sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
-                                     SF_UPGRADE))))
-                       rc = osd_scrub_start(dev);
+       if (sf->sf_flags & SF_UPGRADE ||
+           !(sf->sf_internal_flags & SIF_NO_HANDLE_OLD_FID ||
+             sf->sf_success_count > 0)) {
+               dev->od_igif_inoi = 0;
+               dev->od_check_ff = dev->od_is_ost;
+       } else {
+               dev->od_igif_inoi = 1;
+               dev->od_check_ff = 0;
        }
 
+       if (sf->sf_flags & SF_INCONSISTENT)
+               /* The 'od_igif_inoi' will be set under the
+                * following cases:
+                * 1) new created system, or
+                * 2) restored from file-level backup, or
+                * 3) the upgrading completed.
+                *
+                * The 'od_igif_inoi' may be cleared by OI scrub
+                * later if found that the system is upgrading. */
+               dev->od_igif_inoi = 1;
+
+       if (!dev->od_noscrub &&
+           ((sf->sf_status == SS_PAUSED) ||
+            (sf->sf_status == SS_CRASHED &&
+             sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
+                             SF_UPGRADE | SF_AUTO)) ||
+            (sf->sf_status == SS_INIT &&
+             sf->sf_flags & (SF_RECREATED | SF_INCONSISTENT |
+                             SF_UPGRADE))))
+               rc = osd_scrub_start(dev, SS_AUTO_FULL);
+
+       if (rc != 0)
+               GOTO(cleanup_oi, rc);
+
        /* it is possible that dcache entries may keep objects after they are
         * deleted by OSD. While it looks safe this can cause object data to
         * stay until umount causing failures in tests calculating free space,
@@ -2130,7 +2602,14 @@ int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev)
         * anymore let's just free them after use here */
        shrink_dcache_sb(sb);
 
-       RETURN(rc);
+       RETURN(0);
+cleanup_oi:
+       osd_oi_fini(info, dev);
+cleanup_inode:
+       iput(scrub->os_inode);
+       scrub->os_inode = NULL;
+
+       return rc;
 }
 
 void osd_scrub_cleanup(const struct lu_env *env, struct osd_device *dev)
@@ -2151,8 +2630,7 @@ void osd_scrub_cleanup(const struct lu_env *env, struct osd_device *dev)
 /* object table based iteration APIs */
 
 static struct dt_it *osd_otable_it_init(const struct lu_env *env,
-                                      struct dt_object *dt, __u32 attr,
-                                      struct lustre_capa *capa)
+                                      struct dt_object *dt, __u32 attr)
 {
        enum dt_otable_it_flags flags = attr >> DT_OTABLE_IT_FLAGS_SHIFT;
        enum dt_otable_it_valid valid = attr & ~DT_OTABLE_IT_FLAGS_MASK;
@@ -2188,7 +2666,14 @@ static struct dt_it *osd_otable_it_init(const struct lu_env *env,
                        start |= SS_CLEAR_FAILOUT;
        }
 
-       rc = do_osd_scrub_start(dev, start);
+       if (valid & DOIV_DRYRUN) {
+               if (flags & DOIF_DRYRUN)
+                       start |= SS_SET_DRYRUN;
+               else
+                       start |= SS_CLEAR_DRYRUN;
+       }
+
+       rc = do_osd_scrub_start(dev, start & ~SS_AUTO_PARTIAL);
        if (rc < 0 && rc != -EALREADY) {
                dev->od_otable_it = NULL;
                OBD_FREE_PTR(it);
@@ -2278,7 +2763,7 @@ again:
        if (scrub->os_waiting && osd_scrub_has_window(scrub, ooc)) {
                spin_lock(&scrub->os_lock);
                scrub->os_waiting = 0;
-               cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
+               wake_up_all(&scrub->os_thread.t_ctl_waitq);
                spin_unlock(&scrub->os_lock);
        }
 
@@ -2366,7 +2851,7 @@ static int osd_otable_it_load(const struct lu_env *env,
 
        it->ooi_user_ready = 1;
        if (!scrub->os_full_speed)
-               cfs_waitq_broadcast(&scrub->os_thread.t_ctl_waitq);
+               wake_up_all(&scrub->os_thread.t_ctl_waitq);
 
        /* Unplug OSD layer iteration by the first next() call. */
        rc = osd_otable_it_next(env, (struct dt_it *)it);
@@ -2398,6 +2883,8 @@ const struct dt_index_operations osd_otable_ops = {
 
 /* high priority inconsistent items list APIs */
 
+#define SCRUB_BAD_OIMAP_DECAY_INTERVAL 60
+
 int osd_oii_insert(struct osd_device *dev, struct osd_idmap_cache *oic,
                   int insert)
 {
@@ -2411,10 +2898,30 @@ int osd_oii_insert(struct osd_device *dev, struct osd_idmap_cache *oic,
        if (unlikely(oii == NULL))
                RETURN(-ENOMEM);
 
-       CFS_INIT_LIST_HEAD(&oii->oii_list);
+       INIT_LIST_HEAD(&oii->oii_list);
        oii->oii_cache = *oic;
        oii->oii_insert = insert;
 
+       if (scrub->os_partial_scan) {
+               __u64 now = cfs_time_current_sec();
+
+               /* If there haven't been errors in a long time,
+                * decay old count until either the errors are
+                * gone or we reach the current interval. */
+               while (unlikely(scrub->os_bad_oimap_count > 0 &&
+                               scrub->os_bad_oimap_time +
+                               SCRUB_BAD_OIMAP_DECAY_INTERVAL < now)) {
+                       scrub->os_bad_oimap_count >>= 1;
+                       scrub->os_bad_oimap_time +=
+                               SCRUB_BAD_OIMAP_DECAY_INTERVAL;
+               }
+
+               scrub->os_bad_oimap_time = now;
+               if (++scrub->os_bad_oimap_count >
+                   dev->od_full_scrub_threshold_rate)
+                       scrub->os_full_scrub = 1;
+       }
+
        spin_lock(&scrub->os_lock);
        if (unlikely(!thread_is_running(thread))) {
                spin_unlock(&scrub->os_lock);
@@ -2422,13 +2929,13 @@ int osd_oii_insert(struct osd_device *dev, struct osd_idmap_cache *oic,
                RETURN(-EAGAIN);
        }
 
-       if (cfs_list_empty(&scrub->os_inconsistent_items))
+       if (list_empty(&scrub->os_inconsistent_items))
                wakeup = 1;
-       cfs_list_add_tail(&oii->oii_list, &scrub->os_inconsistent_items);
+       list_add_tail(&oii->oii_list, &scrub->os_inconsistent_items);
        spin_unlock(&scrub->os_lock);
 
        if (wakeup != 0)
-               cfs_waitq_broadcast(&thread->t_ctl_waitq);
+               wake_up_all(&thread->t_ctl_waitq);
 
        RETURN(0);
 }
@@ -2441,7 +2948,7 @@ int osd_oii_lookup(struct osd_device *dev, const struct lu_fid *fid,
        ENTRY;
 
        spin_lock(&scrub->os_lock);
-       cfs_list_for_each_entry(oii, &scrub->os_inconsistent_items, oii_list) {
+       list_for_each_entry(oii, &scrub->os_inconsistent_items, oii_list) {
                if (lu_fid_eq(fid, &oii->oii_cache.oic_fid)) {
                        *id = oii->oii_cache.oic_lid;
                        spin_unlock(&scrub->os_lock);
@@ -2476,137 +2983,116 @@ static const char *scrub_flags_names[] = {
 
 static const char *scrub_param_names[] = {
        "failout",
+       "dryrun",
        NULL
 };
 
-static int scrub_bits_dump(char **buf, int *len, int bits, const char *names[],
+static int scrub_bits_dump(struct seq_file *m, int bits, const char *names[],
                           const char *prefix)
 {
-       int save = *len;
        int flag;
        int rc;
        int i;
 
-       rc = snprintf(*buf, *len, "%s:%c", prefix, bits != 0 ? ' ' : '\n');
-       if (rc <= 0)
-               return -ENOSPC;
+       rc = seq_printf(m, "%s:%c", prefix, bits != 0 ? ' ' : '\n');
+       if (rc < 0)
+               return rc;
 
-       *buf += rc;
-       *len -= rc;
        for (i = 0, flag = 1; bits != 0; i++, flag = 1 << i) {
                if (flag & bits) {
                        bits &= ~flag;
-                       rc = snprintf(*buf, *len, "%s%c", names[i],
-                                     bits != 0 ? ',' : '\n');
-                       if (rc <= 0)
-                               return -ENOSPC;
-
-                       *buf += rc;
-                       *len -= rc;
+                       rc = seq_printf(m, "%s%c", names[i],
+                                       bits != 0 ? ',' : '\n');
+                       if (rc < 0)
+                               return rc;
                }
        }
-       return save - *len;
+       return 0;
 }
 
-static int scrub_time_dump(char **buf, int *len, __u64 time, const char *prefix)
+static int scrub_time_dump(struct seq_file *m, __u64 time, const char *prefix)
 {
        int rc;
 
        if (time != 0)
-               rc = snprintf(*buf, *len, "%s: "LPU64" seconds\n", prefix,
+               rc = seq_printf(m, "%s: "LPU64" seconds\n", prefix,
                              cfs_time_current_sec() - time);
        else
-               rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
-       if (rc <= 0)
-               return -ENOSPC;
-
-       *buf += rc;
-       *len -= rc;
+               rc = seq_printf(m, "%s: N/A\n", prefix);
        return rc;
 }
 
-static int scrub_pos_dump(char **buf, int *len, __u64 pos, const char *prefix)
+static int scrub_pos_dump(struct seq_file *m, __u64 pos, const char *prefix)
 {
        int rc;
 
        if (pos != 0)
-               rc = snprintf(*buf, *len, "%s: "LPU64"\n", prefix, pos);
+               rc = seq_printf(m, "%s: "LPU64"\n", prefix, pos);
        else
-               rc = snprintf(*buf, *len, "%s: N/A\n", prefix);
-       if (rc <= 0)
-               return -ENOSPC;
-
-       *buf += rc;
-       *len -= rc;
+               rc = seq_printf(m, "%s: N/A\n", prefix);
        return rc;
 }
 
-int osd_scrub_dump(struct osd_device *dev, char *buf, int len)
+int osd_scrub_dump(struct seq_file *m, struct osd_device *dev)
 {
        struct osd_scrub  *scrub   = &dev->od_scrub;
        struct scrub_file *sf      = &scrub->os_file;
        __u64              checked;
        __u64              speed;
-       int                save    = len;
-       int                ret     = -ENOSPC;
        int                rc;
 
        down_read(&scrub->os_rwsem);
-       rc = snprintf(buf, len,
-                     "name: OI_scrub\n"
-                     "magic: 0x%x\n"
-                     "oi_files: %d\n"
-                     "status: %s\n",
-                     sf->sf_magic, (int)sf->sf_oi_count,
-                     scrub_status_names[sf->sf_status]);
-       if (rc <= 0)
+       rc = seq_printf(m, "name: OI_scrub\n"
+                       "magic: 0x%x\n"
+                       "oi_files: %d\n"
+                       "status: %s\n",
+                       sf->sf_magic, (int)sf->sf_oi_count,
+                       scrub_status_names[sf->sf_status]);
+       if (rc < 0)
                goto out;
 
-       buf += rc;
-       len -= rc;
-       rc = scrub_bits_dump(&buf, &len, sf->sf_flags, scrub_flags_names,
+       rc = scrub_bits_dump(m, sf->sf_flags, scrub_flags_names,
                             "flags");
        if (rc < 0)
                goto out;
 
-       rc = scrub_bits_dump(&buf, &len, sf->sf_param, scrub_param_names,
+       rc = scrub_bits_dump(m, sf->sf_param, scrub_param_names,
                             "param");
        if (rc < 0)
                goto out;
 
-       rc = scrub_time_dump(&buf, &len, sf->sf_time_last_complete,
+       rc = scrub_time_dump(m, sf->sf_time_last_complete,
                             "time_since_last_completed");
        if (rc < 0)
                goto out;
 
-       rc = scrub_time_dump(&buf, &len, sf->sf_time_latest_start,
+       rc = scrub_time_dump(m, sf->sf_time_latest_start,
                             "time_since_latest_start");
        if (rc < 0)
                goto out;
 
-       rc = scrub_time_dump(&buf, &len, sf->sf_time_last_checkpoint,
+       rc = scrub_time_dump(m, sf->sf_time_last_checkpoint,
                             "time_since_last_checkpoint");
        if (rc < 0)
                goto out;
 
-       rc = scrub_pos_dump(&buf, &len, sf->sf_pos_latest_start,
+       rc = scrub_pos_dump(m, sf->sf_pos_latest_start,
                            "latest_start_position");
        if (rc < 0)
                goto out;
 
-       rc = scrub_pos_dump(&buf, &len, sf->sf_pos_last_checkpoint,
+       rc = scrub_pos_dump(m, sf->sf_pos_last_checkpoint,
                            "last_checkpoint_position");
        if (rc < 0)
                goto out;
 
-       rc = scrub_pos_dump(&buf, &len, sf->sf_pos_first_inconsistent,
+       rc = scrub_pos_dump(m, sf->sf_pos_first_inconsistent,
                            "first_failure_position");
        if (rc < 0)
                goto out;
 
        checked = sf->sf_items_checked + scrub->os_new_checked;
-       rc = snprintf(buf, len,
-                     "checked: "LPU64"\n"
+       rc = seq_printf(m, "checked: "LPU64"\n"
                      "updated: "LPU64"\n"
                      "failed: "LPU64"\n"
                      "prior_updated: "LPU64"\n"
@@ -2616,16 +3102,15 @@ int osd_scrub_dump(struct osd_device *dev, char *buf, int len)
                      checked, sf->sf_items_updated, sf->sf_items_failed,
                      sf->sf_items_updated_prior, sf->sf_items_noscrub,
                      sf->sf_items_igif, sf->sf_success_count);
-       if (rc <= 0)
+       if (rc < 0)
                goto out;
 
-       buf += rc;
-       len -= rc;
        speed = checked;
        if (thread_is_running(&scrub->os_thread)) {
                cfs_duration_t duration = cfs_time_current() -
                                          scrub->os_time_last_checkpoint;
-               __u64 new_checked = scrub->os_new_checked * CFS_HZ;
+               __u64 new_checked = msecs_to_jiffies(scrub->os_new_checked *
+                                                    MSEC_PER_SEC);
                __u32 rtime = sf->sf_run_time +
                              cfs_duration_sec(duration + HALF_SEC);
 
@@ -2633,13 +3118,12 @@ int osd_scrub_dump(struct osd_device *dev, char *buf, int len)
                        do_div(new_checked, duration);
                if (rtime != 0)
                        do_div(speed, rtime);
-               rc = snprintf(buf, len,
-                             "run_time: %u seconds\n"
+               rc = seq_printf(m, "run_time: %u seconds\n"
                              "average_speed: "LPU64" objects/sec\n"
                              "real-time_speed: "LPU64" objects/sec\n"
                              "current_position: %u\n"
                              "lf_scanned: "LPU64"\n"
-                             "lf_reparied: "LPU64"\n"
+                             "lf_repaired: "LPU64"\n"
                              "lf_failed: "LPU64"\n",
                              rtime, speed, new_checked, scrub->os_pos_current,
                              scrub->os_lf_scanned, scrub->os_lf_repaired,
@@ -2647,25 +3131,18 @@ int osd_scrub_dump(struct osd_device *dev, char *buf, int len)
        } else {
                if (sf->sf_run_time != 0)
                        do_div(speed, sf->sf_run_time);
-               rc = snprintf(buf, len,
-                             "run_time: %u seconds\n"
+               rc = seq_printf(m, "run_time: %u seconds\n"
                              "average_speed: "LPU64" objects/sec\n"
                              "real-time_speed: N/A\n"
                              "current_position: N/A\n"
                              "lf_scanned: "LPU64"\n"
-                             "lf_reparied: "LPU64"\n"
+                             "lf_repaired: "LPU64"\n"
                              "lf_failed: "LPU64"\n",
                              sf->sf_run_time, speed, scrub->os_lf_scanned,
                              scrub->os_lf_repaired, scrub->os_lf_failed);
        }
-       if (rc <= 0)
-               goto out;
-
-       buf += rc;
-       len -= rc;
-       ret = save - len;
 
 out:
        up_read(&scrub->os_rwsem);
-       return ret;
+       return (rc < 0 ? -ENOSPC : 0);
 }