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LU-6824 ldiskfs: give warning with dir htree growing
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_compat.c
index e1a04db..d58b6c8 100644 (file)
@@ -27,7 +27,7 @@
  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2012, Intel Corporation.
+ * Copyright (c) 2012, 2015, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
 #include <linux/types.h>
 /* prerequisite for linux/xattr.h */
 #include <linux/fs.h>
+/* XATTR_{REPLACE,CREATE} */
+#include <linux/xattr.h>
 
 /*
  * struct OBD_{ALLOC,FREE}*()
  * OBD_FAIL_CHECK
  */
 #include <obd_support.h>
-#include <lvfs.h>
 
 #include "osd_internal.h"
 #include "osd_oi.h"
@@ -61,28 +62,71 @@ static void osd_push_ctxt(const struct osd_device *dev,
                           struct lvfs_run_ctxt *newctxt,
                           struct lvfs_run_ctxt *save)
 {
-        OBD_SET_CTXT_MAGIC(newctxt);
-        newctxt->pwdmnt = dev->od_mnt;
-        newctxt->pwd = dev->od_mnt->mnt_root;
-        newctxt->fs = get_ds();
-
-        push_ctxt(save, newctxt, NULL);
+       OBD_SET_CTXT_MAGIC(newctxt);
+       newctxt->pwdmnt = dev->od_mnt;
+       newctxt->pwd = dev->od_mnt->mnt_root;
+       newctxt->fs = get_ds();
+       newctxt->umask = current_umask();
+       newctxt->dt = NULL;
+
+       push_ctxt(save, newctxt);
 }
 
-static void osd_pop_ctxt(const struct osd_device *dev,
-                        struct lvfs_run_ctxt *new,
-                        struct lvfs_run_ctxt *save)
+/* utility to make a directory */
+static struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
+                                  const char *name, int mode, int fix)
 {
-       pop_ctxt(save, new, NULL);
+       struct dentry *dchild;
+       int err = 0;
+       ENTRY;
+
+       // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
+       CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
+       dchild = ll_lookup_one_len(name, dir, strlen(name));
+       if (IS_ERR(dchild))
+               GOTO(out_up, dchild);
+
+       if (dchild->d_inode) {
+               int old_mode = dchild->d_inode->i_mode;
+               if (!S_ISDIR(old_mode)) {
+                       CERROR("found %s (%lu/%u) is mode %o\n", name,
+                              dchild->d_inode->i_ino,
+                              dchild->d_inode->i_generation, old_mode);
+                       GOTO(out_err, err = -ENOTDIR);
+               }
+
+               /* Fixup directory permissions if necessary */
+               if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
+                       CDEBUG(D_CONFIG,
+                              "fixing permissions on %s from %o to %o\n",
+                              name, old_mode, mode);
+                       dchild->d_inode->i_mode = (mode & S_IALLUGO) |
+                                                 (old_mode & ~S_IALLUGO);
+                       mark_inode_dirty(dchild->d_inode);
+               }
+               GOTO(out_up, dchild);
+       }
+
+       err = vfs_mkdir(dir->d_inode, dchild, mode);
+       if (err)
+               GOTO(out_err, err);
+
+       RETURN(dchild);
+
+out_err:
+       dput(dchild);
+       dchild = ERR_PTR(err);
+out_up:
+       return dchild;
 }
 
-int osd_last_rcvd_subdir_count(struct osd_device *osd)
+static int osd_last_rcvd_subdir_count(struct osd_device *osd)
 {
         struct lr_server_data lsd;
         struct dentry        *dlast;
         loff_t                off;
         int                   rc = 0;
-       int                   count = FILTER_SUBDIR_COUNT;
+       int                   count = OBJ_SUBDIR_COUNT;
 
         ENTRY;
 
@@ -114,6 +158,190 @@ out:
        return count;
 }
 
+static const char remote_parent_dir[] = "REMOTE_PARENT_DIR";
+static int osd_mdt_init(const struct lu_env *env, struct osd_device *dev)
+{
+       struct lvfs_run_ctxt    new;
+       struct lvfs_run_ctxt    save;
+       struct dentry           *parent;
+       struct osd_mdobj_map    *omm;
+       struct dentry           *d;
+       struct osd_thread_info  *info = osd_oti_get(env);
+       struct lu_fid           *fid = &info->oti_fid3;
+       int                     rc = 0;
+       ENTRY;
+
+       OBD_ALLOC_PTR(dev->od_mdt_map);
+       if (dev->od_mdt_map == NULL)
+               RETURN(-ENOMEM);
+
+       omm = dev->od_mdt_map;
+
+       parent = osd_sb(dev)->s_root;
+       osd_push_ctxt(dev, &new, &save);
+
+       d = simple_mkdir(parent, dev->od_mnt, remote_parent_dir,
+                        0755, 1);
+       if (IS_ERR(d))
+               GOTO(cleanup, rc = PTR_ERR(d));
+
+       omm->omm_remote_parent = d;
+
+       /* Set LMA for remote parent inode */
+       lu_local_obj_fid(fid, REMOTE_PARENT_DIR_OID);
+       rc = osd_ea_fid_set(info, d->d_inode, fid, LMAC_NOT_IN_OI, 0);
+
+       GOTO(cleanup, rc);
+
+cleanup:
+       pop_ctxt(&save, &new);
+       if (rc) {
+               if (omm->omm_remote_parent != NULL)
+                       dput(omm->omm_remote_parent);
+               OBD_FREE_PTR(omm);
+               dev->od_mdt_map = NULL;
+       }
+       return rc;
+}
+
+static void osd_mdt_fini(struct osd_device *osd)
+{
+       struct osd_mdobj_map *omm = osd->od_mdt_map;
+
+       if (omm == NULL)
+               return;
+
+       if (omm->omm_remote_parent)
+               dput(omm->omm_remote_parent);
+
+       OBD_FREE_PTR(omm);
+       osd->od_ost_map = NULL;
+}
+
+int osd_add_to_remote_parent(const struct lu_env *env, struct osd_device *osd,
+                            struct osd_object *obj, struct osd_thandle *oh)
+{
+       struct osd_mdobj_map    *omm = osd->od_mdt_map;
+       struct osd_thread_info  *oti = osd_oti_get(env);
+       struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
+       char                    *name = oti->oti_name;
+       struct osd_thread_info  *info = osd_oti_get(env);
+       struct dentry           *dentry;
+       struct dentry           *parent;
+       int                     rc;
+
+       /* Set REMOTE_PARENT in lma, so other process like unlink or lfsck
+        * can identify this object quickly */
+       rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
+       if (rc != 0)
+               RETURN(rc);
+
+       lma->lma_incompat |= LMAI_REMOTE_PARENT;
+       lustre_lma_swab(lma);
+       rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
+                            sizeof(*lma), XATTR_REPLACE);
+       if (rc != 0)
+               RETURN(rc);
+
+       parent = omm->omm_remote_parent;
+       sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
+       dentry = osd_child_dentry_by_inode(env, parent->d_inode,
+                                          name, strlen(name));
+       mutex_lock(&parent->d_inode->i_mutex);
+       rc = osd_ldiskfs_add_entry(info, oh->ot_handle, dentry,
+                                  obj->oo_inode, NULL);
+       CDEBUG(D_INODE, "%s: add %s:%lu to remote parent %lu.\n", osd_name(osd),
+              name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
+       ldiskfs_inc_count(oh->ot_handle, parent->d_inode);
+       mark_inode_dirty(parent->d_inode);
+       mutex_unlock(&parent->d_inode->i_mutex);
+       RETURN(rc);
+}
+
+int osd_delete_from_remote_parent(const struct lu_env *env,
+                                 struct osd_device *osd,
+                                 struct osd_object *obj,
+                                 struct osd_thandle *oh)
+{
+       struct osd_mdobj_map       *omm = osd->od_mdt_map;
+       struct osd_thread_info     *oti = osd_oti_get(env);
+       struct lustre_mdt_attrs    *lma = &oti->oti_mdt_attrs;
+       char                       *name = oti->oti_name;
+       struct dentry              *dentry;
+       struct dentry              *parent;
+       struct ldiskfs_dir_entry_2 *de;
+       struct buffer_head         *bh;
+       int                        rc;
+
+       /* Check lma to see whether it is remote object */
+       rc = osd_get_lma(oti, obj->oo_inode, &oti->oti_obj_dentry, lma);
+       if (rc != 0)
+               RETURN(rc);
+
+       if (likely(!(lma->lma_incompat & LMAI_REMOTE_PARENT)))
+               RETURN(0);
+
+       parent = omm->omm_remote_parent;
+       sprintf(name, DFID_NOBRACE, PFID(lu_object_fid(&obj->oo_dt.do_lu)));
+       dentry = osd_child_dentry_by_inode(env, parent->d_inode,
+                                          name, strlen(name));
+       mutex_lock(&parent->d_inode->i_mutex);
+       bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
+                                   NULL, NULL);
+       if (bh == NULL) {
+               mutex_unlock(&parent->d_inode->i_mutex);
+               RETURN(-ENOENT);
+       }
+       CDEBUG(D_INODE, "%s: el %s:%lu to remote parent %lu.\n", osd_name(osd),
+              name, obj->oo_inode->i_ino, parent->d_inode->i_ino);
+       rc = ldiskfs_delete_entry(oh->ot_handle, parent->d_inode, de, bh);
+       ldiskfs_dec_count(oh->ot_handle, parent->d_inode);
+       mark_inode_dirty(parent->d_inode);
+       mutex_unlock(&parent->d_inode->i_mutex);
+       brelse(bh);
+
+       /* Get rid of REMOTE_PARENT flag from incompat */
+       lma->lma_incompat &= ~LMAI_REMOTE_PARENT;
+       lustre_lma_swab(lma);
+       rc = __osd_xattr_set(oti, obj->oo_inode, XATTR_NAME_LMA, lma,
+                            sizeof(*lma), XATTR_REPLACE);
+       RETURN(rc);
+}
+
+int osd_lookup_in_remote_parent(struct osd_thread_info *oti,
+                               struct osd_device *osd,
+                               const struct lu_fid *fid,
+                               struct osd_inode_id *id)
+{
+       struct osd_mdobj_map        *omm = osd->od_mdt_map;
+       char                        *name = oti->oti_name;
+       struct dentry               *parent;
+       struct dentry               *dentry;
+       struct ldiskfs_dir_entry_2 *de;
+       struct buffer_head         *bh;
+       int                         rc;
+       ENTRY;
+
+       parent = omm->omm_remote_parent;
+       sprintf(name, DFID_NOBRACE, PFID(fid));
+       dentry = osd_child_dentry_by_inode(oti->oti_env, parent->d_inode,
+                                          name, strlen(name));
+       mutex_lock(&parent->d_inode->i_mutex);
+       bh = osd_ldiskfs_find_entry(parent->d_inode, &dentry->d_name, &de,
+                                   NULL, NULL);
+       if (bh == NULL) {
+               rc = -ENOENT;
+       } else {
+               rc = 0;
+               osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
+               brelse(bh);
+       }
+       mutex_unlock(&parent->d_inode->i_mutex);
+       if (rc == 0)
+               osd_add_oi_cache(oti, osd, id, fid);
+       RETURN(rc);
+}
+
 /*
  * directory structure on legacy OST:
  *
@@ -124,13 +352,16 @@ out:
  * CONFIGS
  *
  */
-int osd_ost_init(struct osd_device *dev)
+static int osd_ost_init(const struct lu_env *env, struct osd_device *dev)
 {
-       struct lvfs_run_ctxt  new;
-       struct lvfs_run_ctxt  save;
-       struct dentry        *rootd = osd_sb(dev)->s_root;
-       struct dentry        *d;
-       int                   rc;
+       struct lvfs_run_ctxt     new;
+       struct lvfs_run_ctxt     save;
+       struct dentry           *rootd = osd_sb(dev)->s_root;
+       struct dentry           *d;
+       struct osd_thread_info  *info = osd_oti_get(env);
+       struct inode            *inode;
+       struct lu_fid           *fid = &info->oti_fid3;
+       int                      rc;
        ENTRY;
 
        OBD_ALLOC_PTR(dev->od_ost_map);
@@ -139,35 +370,55 @@ int osd_ost_init(struct osd_device *dev)
 
        /* to get subdir count from last_rcvd */
        rc = osd_last_rcvd_subdir_count(dev);
-       if (rc < 0) {
-               OBD_FREE_PTR(dev->od_ost_map);
-               RETURN(rc);
-       }
+       if (rc < 0)
+               GOTO(cleanup_alloc, rc);
 
        dev->od_ost_map->om_subdir_count = rc;
         rc = 0;
 
-       CFS_INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
+       INIT_LIST_HEAD(&dev->od_ost_map->om_seq_list);
        rwlock_init(&dev->od_ost_map->om_seq_list_lock);
-       sema_init(&dev->od_ost_map->om_dir_init_sem, 1);
+       mutex_init(&dev->od_ost_map->om_dir_init_mutex);
 
-        LASSERT(dev->od_fsops);
         osd_push_ctxt(dev, &new, &save);
 
-        d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
+       d = ll_lookup_one_len("O", rootd, strlen("O"));
        if (IS_ERR(d))
-               GOTO(cleanup, rc = PTR_ERR(d));
+               GOTO(cleanup_ctxt, rc = PTR_ERR(d));
+       if (d->d_inode == NULL) {
+               dput(d);
+               /* The lookup() may be called again inside simple_mkdir().
+                * Since the repeated lookup() only be called for "/O" at
+                * mount time, it will not affect the whole performance. */
+               d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
+               if (IS_ERR(d))
+                       GOTO(cleanup_ctxt, rc = PTR_ERR(d));
+
+               /* It is quite probably that the device is new formatted. */
+               dev->od_maybe_new = 1;
+       }
 
+       inode = d->d_inode;
        dev->od_ost_map->om_root = d;
 
-cleanup:
-       osd_pop_ctxt(dev, &new, &save);
-        if (IS_ERR(d)) {
-                OBD_FREE_PTR(dev->od_ost_map);
-                RETURN(PTR_ERR(d));
-        }
+       /* '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 | LMAC_FID_ON_OST, 0);
+       if (rc)
+               GOTO(cleanup_dentry, rc);
 
-       RETURN(rc);
+       pop_ctxt(&save, &new);
+       RETURN(0);
+
+cleanup_dentry:
+       dput(d);
+cleanup_ctxt:
+       pop_ctxt(&save, &new);
+cleanup_alloc:
+       OBD_FREE_PTR(dev->od_ost_map);
+       return rc;
 }
 
 static void osd_seq_free(struct osd_obj_map *map,
@@ -175,7 +426,7 @@ static void osd_seq_free(struct osd_obj_map *map,
 {
        int j;
 
-       cfs_list_del_init(&osd_seq->oos_seq_list);
+       list_del_init(&osd_seq->oos_seq_list);
 
        if (osd_seq->oos_dirs) {
                for (j = 0; j < osd_seq->oos_subdir_count; j++) {
@@ -192,31 +443,59 @@ static void osd_seq_free(struct osd_obj_map *map,
        OBD_FREE_PTR(osd_seq);
 }
 
-int osd_obj_map_init(struct osd_device *dev)
+static void osd_ost_fini(struct osd_device *osd)
+{
+       struct osd_obj_seq    *osd_seq;
+       struct osd_obj_seq    *tmp;
+       struct osd_obj_map    *map = osd->od_ost_map;
+       ENTRY;
+
+       if (map == NULL)
+               return;
+
+       write_lock(&map->om_seq_list_lock);
+       list_for_each_entry_safe(osd_seq, tmp, &map->om_seq_list,
+                                oos_seq_list) {
+               osd_seq_free(map, osd_seq);
+       }
+       write_unlock(&map->om_seq_list_lock);
+       if (map->om_root)
+               dput(map->om_root);
+       OBD_FREE_PTR(map);
+       osd->od_ost_map = NULL;
+       EXIT;
+}
+
+int osd_obj_map_init(const struct lu_env *env, struct osd_device *dev)
 {
        int rc;
        ENTRY;
 
        /* prepare structures for OST */
-       rc = osd_ost_init(dev);
+       rc = osd_ost_init(env, dev);
+       if (rc)
+               RETURN(rc);
 
        /* prepare structures for MDS */
+       rc = osd_mdt_init(env, dev);
+       if (rc)
+               osd_ost_fini(dev);
 
         RETURN(rc);
 }
 
-struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, obd_seq seq)
+static struct osd_obj_seq *osd_seq_find_locked(struct osd_obj_map *map, u64 seq)
 {
        struct osd_obj_seq *osd_seq;
 
-       cfs_list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
+       list_for_each_entry(osd_seq, &map->om_seq_list, oos_seq_list) {
                if (osd_seq->oos_seq == seq)
                        return osd_seq;
        }
        return NULL;
 }
 
-struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, obd_seq seq)
+static struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, u64 seq)
 {
        struct osd_obj_seq *osd_seq;
 
@@ -228,61 +507,185 @@ struct osd_obj_seq *osd_seq_find(struct osd_obj_map *map, obd_seq seq)
 
 void osd_obj_map_fini(struct osd_device *dev)
 {
-       struct osd_obj_seq    *osd_seq;
-       struct osd_obj_seq    *tmp;
-       struct osd_obj_map    *map = dev->od_ost_map;
+       osd_ost_fini(dev);
+       osd_mdt_fini(dev);
+}
+
+/**
+ * Update the specified OI mapping.
+ *
+ * \retval   1, changed nothing
+ * \retval   0, changed successfully
+ * \retval -ve, on error
+ */
+static int osd_obj_update_entry(struct osd_thread_info *info,
+                               struct osd_device *osd,
+                               struct dentry *dir, const char *name,
+                               const struct lu_fid *fid,
+                               const struct osd_inode_id *id,
+                               handle_t *th)
+{
+       struct inode               *parent = dir->d_inode;
+       struct dentry              *child;
+       struct ldiskfs_dir_entry_2 *de;
+       struct buffer_head         *bh;
+       struct inode               *inode;
+       struct dentry              *dentry = &info->oti_obj_dentry;
+       struct osd_inode_id        *oi_id  = &info->oti_id3;
+       struct lustre_mdt_attrs    *lma    = &info->oti_mdt_attrs;
+       struct lu_fid              *oi_fid = &lma->lma_self_fid;
+       int                         rc;
        ENTRY;
 
-       map = dev->od_ost_map;
-       if (map == NULL)
-               return;
+       LASSERT(th != NULL);
+       LASSERT(th->h_transaction != NULL);
 
-       write_lock(&dev->od_ost_map->om_seq_list_lock);
-       cfs_list_for_each_entry_safe(osd_seq, tmp,
-                                    &dev->od_ost_map->om_seq_list,
-                                    oos_seq_list) {
-               osd_seq_free(map, osd_seq);
+       child = &info->oti_child_dentry;
+       child->d_parent = dir;
+       child->d_name.hash = 0;
+       child->d_name.name = name;
+       child->d_name.len = strlen(name);
+
+       ll_vfs_dq_init(parent);
+       mutex_lock(&parent->i_mutex);
+       bh = osd_ldiskfs_find_entry(parent, &child->d_name, &de, NULL, NULL);
+       if (bh == NULL)
+               GOTO(out, rc = -ENOENT);
+
+       if (le32_to_cpu(de->inode) == id->oii_ino)
+               GOTO(out, rc = 1);
+
+       osd_id_gen(oi_id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
+       inode = osd_iget(info, osd, oi_id);
+       if (IS_ERR(inode)) {
+               rc = PTR_ERR(inode);
+               if (rc == -ENOENT || rc == -ESTALE)
+                       goto update;
+               GOTO(out, rc);
        }
-       write_unlock(&dev->od_ost_map->om_seq_list_lock);
-       if (map->om_root)
-               dput(map->om_root);
-       OBD_FREE_PTR(dev->od_ost_map);
-       dev->od_ost_map = NULL;
-       EXIT;
+
+       /* The EA inode should NOT be in OI, old OI scrub may added
+        * such OI mapping by wrong, replace it. */
+       if (unlikely(osd_is_ea_inode(inode))) {
+               iput(inode);
+               goto update;
+       }
+
+       rc = osd_get_lma(info, inode, dentry, lma);
+       if (rc == -ENODATA) {
+               rc = osd_get_idif(info, inode, dentry, oi_fid);
+               if (rc > 0 || rc == -ENODATA) {
+                       oi_fid = NULL;
+                       rc = 0;
+               }
+       }
+       iput(inode);
+
+       if (rc != 0)
+               GOTO(out, rc);
+
+       /* If the OST-object has neither FID-in-LMA nor FID-in-ff, it is
+        * either a crashed object or a uninitialized one. Replace it. */
+       if (oi_fid != NULL && lu_fid_eq(fid, oi_fid)) {
+               CERROR("%s: the FID "DFID" is used by two objects: "
+                      "%u/%u %u/%u\n", osd_name(osd), PFID(fid),
+                      oi_id->oii_ino, oi_id->oii_gen,
+                      id->oii_ino, id->oii_gen);
+               GOTO(out, rc = -EEXIST);
+       }
+
+       if (fid_is_idif(fid) && oi_fid != NULL && fid_is_idif(oi_fid)) {
+               __u32 idx1 = fid_idif_ost_idx(fid);
+               __u32 idx2 = fid_idif_ost_idx(oi_fid);
+               struct ost_id *ostid = &info->oti_ostid;
+               struct lu_fid *tfid = &info->oti_fid3;
+
+               LASSERTF(idx1 == 0 || idx1 == osd->od_index,
+                        "invalid given FID "DFID", not match the "
+                        "device index %u\n", PFID(fid), osd->od_index);
+
+               if (idx1 != idx2) {
+                       if (idx1 == 0 && idx2 == osd->od_index) {
+                               fid_to_ostid(fid, ostid);
+                               ostid_to_fid(tfid, ostid, idx2);
+                               if (lu_fid_eq(tfid, oi_fid)) {
+                                       CERROR("%s: the FID "DFID" is used by "
+                                              "two objects(2): %u/%u %u/%u\n",
+                                              osd_name(osd), PFID(fid),
+                                              oi_id->oii_ino, oi_id->oii_gen,
+                                              id->oii_ino, id->oii_gen);
+
+                                       GOTO(out, rc = -EEXIST);
+                               }
+                       } else if (idx2 == 0 && idx1 == osd->od_index) {
+                               fid_to_ostid(oi_fid, ostid);
+                               ostid_to_fid(tfid, ostid, idx1);
+                               if (lu_fid_eq(tfid, fid)) {
+                                       CERROR("%s: the FID "DFID" is used by "
+                                              "two objects(2): %u/%u %u/%u\n",
+                                              osd_name(osd), PFID(fid),
+                                              oi_id->oii_ino, oi_id->oii_gen,
+                                              id->oii_ino, id->oii_gen);
+
+                                       GOTO(out, rc = -EEXIST);
+                               }
+                       }
+               }
+       }
+
+update:
+       /* There may be temporary inconsistency: On one hand, the new
+        * object may be referenced by multiple entries, which is out
+        * of our control unless we traverse the whole /O completely,
+        * which is non-flat order and inefficient, should be avoided;
+        * On the other hand, the old object may become orphan if it
+        * is still valid. Since it was referenced by an invalid entry,
+        * making it as invisible temporary may be not worse. OI scrub
+        * will process it later. */
+       rc = ldiskfs_journal_get_write_access(th, bh);
+       if (rc != 0)
+               GOTO(out, rc);
+
+       de->inode = cpu_to_le32(id->oii_ino);
+       rc = ldiskfs_handle_dirty_metadata(th, NULL, bh);
+
+       GOTO(out, rc);
+
+out:
+       brelse(bh);
+       mutex_unlock(&parent->i_mutex);
+       return rc;
 }
 
 static int osd_obj_del_entry(struct osd_thread_info *info,
                             struct osd_device *osd,
                             struct dentry *dird, char *name,
-                            struct thandle *th)
+                            handle_t *th)
 {
-        struct ldiskfs_dir_entry_2 *de;
-        struct buffer_head         *bh;
-        struct osd_thandle         *oh;
-        struct dentry              *child;
-        struct inode               *dir = dird->d_inode;
-        int                         rc;
-
-        ENTRY;
+       struct ldiskfs_dir_entry_2 *de;
+       struct buffer_head         *bh;
+       struct dentry              *child;
+       struct inode               *dir = dird->d_inode;
+       int                         rc;
+       ENTRY;
 
-        oh = container_of(th, struct osd_thandle, ot_super);
-        LASSERT(oh->ot_handle != NULL);
-        LASSERT(oh->ot_handle->h_transaction != NULL);
+       LASSERT(th != NULL);
+       LASSERT(th->h_transaction != NULL);
 
 
-        child = &info->oti_child_dentry;
-        child->d_name.hash = 0;
-        child->d_name.name = name;
-        child->d_name.len = strlen(name);
-        child->d_parent = dird;
-        child->d_inode = NULL;
+       child = &info->oti_child_dentry;
+       child->d_name.hash = 0;
+       child->d_name.name = name;
+       child->d_name.len = strlen(name);
+       child->d_parent = dird;
+       child->d_inode = NULL;
 
        ll_vfs_dq_init(dir);
        mutex_lock(&dir->i_mutex);
        rc = -ENOENT;
-       bh = osd_ldiskfs_find_entry(dir, child, &de, NULL);
+       bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
        if (bh) {
-               rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
+               rc = ldiskfs_delete_entry(th, dir, de, bh);
                brelse(bh);
        }
        mutex_unlock(&dir->i_mutex);
@@ -290,38 +693,50 @@ static int osd_obj_del_entry(struct osd_thread_info *info,
        RETURN(rc);
 }
 
-int osd_obj_add_entry(struct osd_thread_info *info,
-                     struct osd_device *osd,
-                     struct dentry *dir, char *name,
-                     const struct osd_inode_id *id,
-                     struct thandle *th)
+static int osd_obj_add_entry(struct osd_thread_info *info,
+                            struct osd_device *osd,
+                            struct dentry *dir, char *name,
+                            const struct osd_inode_id *id,
+                            handle_t *th)
 {
-        struct osd_thandle *oh;
-        struct dentry *child;
-        struct inode *inode;
-        int rc;
+       struct dentry *child;
+       struct inode *inode;
+       int rc;
 
-        ENTRY;
+       ENTRY;
 
-        oh = container_of(th, struct osd_thandle, ot_super);
-        LASSERT(oh->ot_handle != NULL);
-        LASSERT(oh->ot_handle->h_transaction != NULL);
+       if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_NO_ENTRY))
+               RETURN(0);
+
+       LASSERT(th != NULL);
+       LASSERT(th->h_transaction != NULL);
+
+       inode = info->oti_inode;
+       if (unlikely(inode == NULL)) {
+               struct ldiskfs_inode_info *lii;
+               OBD_ALLOC_PTR(lii);
+               if (lii == NULL)
+                       RETURN(-ENOMEM);
+               inode = info->oti_inode = &lii->vfs_inode;
+       }
 
-        inode = &info->oti_inode;
-        inode->i_sb = osd_sb(osd);
+       inode->i_sb = osd_sb(osd);
        osd_id_to_inode(inode, id);
        inode->i_mode = S_IFREG; /* for type in ldiskfs dir entry */
 
-        child = &info->oti_child_dentry;
-        child->d_name.hash = 0;
-        child->d_name.name = name;
-        child->d_name.len = strlen(name);
-        child->d_parent = dir;
-        child->d_inode = inode;
+       child = &info->oti_child_dentry;
+       child->d_name.hash = 0;
+       child->d_name.name = name;
+       child->d_name.len = strlen(name);
+       child->d_parent = dir;
+       child->d_inode = inode;
+
+       if (OBD_FAIL_CHECK(OBD_FAIL_OSD_COMPAT_INVALID_ENTRY))
+               inode->i_ino++;
 
        ll_vfs_dq_init(dir->d_inode);
        mutex_lock(&dir->d_inode->i_mutex);
-       rc = osd_ldiskfs_add_entry(oh->ot_handle, child, inode, NULL);
+       rc = osd_ldiskfs_add_entry(info, th, child, inode, NULL);
        mutex_unlock(&dir->d_inode->i_mutex);
 
        RETURN(rc);
@@ -334,29 +749,35 @@ int osd_obj_add_entry(struct osd_thread_info *info,
  * debug messages to objects in the future, and the legacy space
  * of FID_SEQ_OST_MDT0 will be unused in the future.
  **/
-static inline void osd_seq_name(char *seq_name, obd_seq seq)
+static inline void osd_seq_name(char *seq_name, size_t name_size, u64 seq)
 {
-       sprintf(seq_name, (fid_seq_is_rsvd(seq) ||
-                          fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
-               fid_seq_is_idif(seq) ? 0 : seq);
+       snprintf(seq_name, name_size,
+                (fid_seq_is_rsvd(seq) ||
+                 fid_seq_is_mdt0(seq)) ? LPU64 : LPX64i,
+                fid_seq_is_idif(seq) ? 0 : seq);
 }
 
-static inline void osd_oid_name(char *name, const struct lu_fid *fid, obd_id id)
+static inline void osd_oid_name(char *name, size_t name_size,
+                               const struct lu_fid *fid, u64 id)
 {
-       sprintf(name, (fid_seq_is_rsvd(fid_seq(fid)) ||
-               fid_seq_is_mdt0(fid_seq(fid)) ||
-               fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
+       snprintf(name, name_size,
+                (fid_seq_is_rsvd(fid_seq(fid)) ||
+                 fid_seq_is_mdt0(fid_seq(fid)) ||
+                 fid_seq_is_idif(fid_seq(fid))) ? LPU64 : LPX64i, id);
 }
 
 /* external locking is required */
-static int osd_seq_load_locked(struct osd_device *osd,
+static int osd_seq_load_locked(struct osd_thread_info *info,
+                              struct osd_device *osd,
                               struct osd_obj_seq *osd_seq)
 {
        struct osd_obj_map  *map = osd->od_ost_map;
        struct dentry       *seq_dir;
+       struct inode        *inode;
+       struct lu_fid       *fid = &info->oti_fid3;
        int                 rc = 0;
        int                 i;
-       char                seq_name[32];
+       char                dir_name[32];
        ENTRY;
 
        if (osd_seq->oos_root != NULL)
@@ -365,16 +786,25 @@ static int osd_seq_load_locked(struct osd_device *osd,
        LASSERT(map);
        LASSERT(map->om_root);
 
-       osd_seq_name(seq_name, osd_seq->oos_seq);
+       osd_seq_name(dir_name, sizeof(dir_name), osd_seq->oos_seq);
 
-       seq_dir = simple_mkdir(map->om_root, osd->od_mnt, seq_name, 0755, 1);
+       seq_dir = simple_mkdir(map->om_root, osd->od_mnt, dir_name, 0755, 1);
        if (IS_ERR(seq_dir))
                GOTO(out_err, rc = PTR_ERR(seq_dir));
        else if (seq_dir->d_inode == NULL)
                GOTO(out_put, rc = -EFAULT);
 
+       inode = seq_dir->d_inode;
        osd_seq->oos_root = seq_dir;
 
+       /* '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 | LMAC_FID_ON_OST, 0);
+       if (rc != 0)
+               GOTO(out_put, rc);
+
        LASSERT(osd_seq->oos_dirs == NULL);
        OBD_ALLOC(osd_seq->oos_dirs,
                  sizeof(seq_dir) * osd_seq->oos_subdir_count);
@@ -383,25 +813,38 @@ static int osd_seq_load_locked(struct osd_device *osd,
 
        for (i = 0; i < osd_seq->oos_subdir_count; i++) {
                struct dentry   *dir;
-               char         name[32];
 
-               sprintf(name, "d%u", i);
-               dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, name,
+               snprintf(dir_name, sizeof(dir_name), "d%u", i);
+               dir = simple_mkdir(osd_seq->oos_root, osd->od_mnt, dir_name,
                                   0700, 1);
                if (IS_ERR(dir)) {
-                       rc = PTR_ERR(dir);
-               } else if (dir->d_inode) {
-                       osd_seq->oos_dirs[i] = dir;
-                       rc = 0;
-               } else {
-                       LBUG();
+                       GOTO(out_free, rc = PTR_ERR(dir));
+               } else if (dir->d_inode == NULL) {
+                       dput(dir);
+                       GOTO(out_free, rc = -EFAULT);
                }
+
+               inode = dir->d_inode;
+               osd_seq->oos_dirs[i] = dir;
+
+               /* '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 | LMAC_FID_ON_OST, 0);
+               if (rc != 0)
+                       GOTO(out_free, rc);
        }
 
-       if (rc != 0)
-               osd_seq_free(map, osd_seq);
-out_put:
        if (rc != 0) {
+out_free:
+               for (i = 0; i < osd_seq->oos_subdir_count; i++) {
+                       if (osd_seq->oos_dirs[i] != NULL)
+                               dput(osd_seq->oos_dirs[i]);
+               }
+               OBD_FREE(osd_seq->oos_dirs,
+                        sizeof(seq_dir) * osd_seq->oos_subdir_count);
+out_put:
                dput(seq_dir);
                osd_seq->oos_root = NULL;
        }
@@ -409,7 +852,8 @@ out_err:
        RETURN(rc);
 }
 
-static struct osd_obj_seq *osd_seq_load(struct osd_device *osd, obd_seq seq)
+static struct osd_obj_seq *osd_seq_load(struct osd_thread_info *info,
+                                       struct osd_device *osd, u64 seq)
 {
        struct osd_obj_map      *map;
        struct osd_obj_seq      *osd_seq;
@@ -425,7 +869,7 @@ static struct osd_obj_seq *osd_seq_load(struct osd_device *osd, obd_seq seq)
                RETURN(osd_seq);
 
        /* Serializing init process */
-       down(&map->om_dir_init_sem);
+       mutex_lock(&map->om_dir_init_mutex);
 
        /* Check whether the seq has been added */
        read_lock(&map->om_seq_list_lock);
@@ -440,21 +884,21 @@ static struct osd_obj_seq *osd_seq_load(struct osd_device *osd, obd_seq seq)
        if (osd_seq == NULL)
                GOTO(cleanup, rc = -ENOMEM);
 
-       CFS_INIT_LIST_HEAD(&osd_seq->oos_seq_list);
+       INIT_LIST_HEAD(&osd_seq->oos_seq_list);
        osd_seq->oos_seq = seq;
        /* Init subdir count to be 32, but each seq can have
         * different subdir count */
        osd_seq->oos_subdir_count = map->om_subdir_count;
-       rc = osd_seq_load_locked(osd, osd_seq);
+       rc = osd_seq_load_locked(info, osd, osd_seq);
        if (rc != 0)
                GOTO(cleanup, rc);
 
        write_lock(&map->om_seq_list_lock);
-       cfs_list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
+       list_add(&osd_seq->oos_seq_list, &map->om_seq_list);
        write_unlock(&map->om_seq_list_lock);
 
 cleanup:
-       up(&map->om_dir_init_sem);
+       mutex_unlock(&map->om_dir_init_mutex);
        if (rc != 0) {
                if (osd_seq != NULL)
                        OBD_FREE_PTR(osd_seq);
@@ -486,16 +930,16 @@ int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
         LASSERT(map);
        LASSERT(map->om_root);
 
-        fid_ostid_pack(fid, ostid);
-       osd_seq = osd_seq_load(dev, ostid->oi_seq);
+        fid_to_ostid(fid, ostid);
+       osd_seq = osd_seq_load(info, dev, ostid_seq(ostid));
        if (IS_ERR(osd_seq))
                RETURN(PTR_ERR(osd_seq));
 
-       dirn = ostid->oi_id & (osd_seq->oos_subdir_count - 1);
+       dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
        d_seq = osd_seq->oos_dirs[dirn];
        LASSERT(d_seq);
 
-       osd_oid_name(name, fid, ostid->oi_id);
+       osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
 
        child = &info->oti_child_dentry;
        child->d_parent = d_seq;
@@ -506,7 +950,7 @@ int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
 
        dir = d_seq->d_inode;
        mutex_lock(&dir->i_mutex);
-       bh = osd_ldiskfs_find_entry(dir, child, &de, NULL);
+       bh = osd_ldiskfs_find_entry(dir, &child->d_name, &de, NULL, NULL);
        mutex_unlock(&dir->i_mutex);
 
        if (bh == NULL)
@@ -516,8 +960,11 @@ int osd_obj_map_lookup(struct osd_thread_info *info, struct osd_device *dev,
        brelse(bh);
 
        inode = osd_iget(info, dev, id);
-       if (IS_ERR(inode))
-               RETURN(PTR_ERR(inode));
+       if (IS_ERR(inode)) {
+               int rc = PTR_ERR(inode);
+
+               RETURN(rc == -ENOENT ? -ESTALE : rc);
+       }
 
        iput(inode);
        RETURN(0);
@@ -527,38 +974,50 @@ int osd_obj_map_insert(struct osd_thread_info *info,
                       struct osd_device *osd,
                       const struct lu_fid *fid,
                       const struct osd_inode_id *id,
-                      struct thandle *th)
+                      handle_t *th)
 {
        struct osd_obj_map      *map;
        struct osd_obj_seq      *osd_seq;
        struct dentry           *d;
        struct ost_id           *ostid = &info->oti_ostid;
+       u64                      oid;
        int                     dirn, rc = 0;
        char                    name[32];
-        ENTRY;
+       ENTRY;
 
-        map = osd->od_ost_map;
-        LASSERT(map);
+       map = osd->od_ost_map;
+       LASSERT(map);
 
        /* map fid to seq:objid */
-        fid_ostid_pack(fid, ostid);
+       fid_to_ostid(fid, ostid);
 
-       osd_seq = osd_seq_load(osd, ostid->oi_seq);
+       oid = ostid_id(ostid);
+       osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
        if (IS_ERR(osd_seq))
                RETURN(PTR_ERR(osd_seq));
 
-       dirn = ostid->oi_id & (osd_seq->oos_subdir_count - 1);
+       dirn = oid & (osd_seq->oos_subdir_count - 1);
        d = osd_seq->oos_dirs[dirn];
-        LASSERT(d);
+       LASSERT(d);
+
+       osd_oid_name(name, sizeof(name), fid, oid);
 
-       osd_oid_name(name, fid, ostid->oi_id);
+again:
        rc = osd_obj_add_entry(info, osd, d, name, id, th);
+       if (rc == -EEXIST) {
+               rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
+               if (unlikely(rc == -ENOENT))
+                       goto again;
 
-        RETURN(rc);
+               if (unlikely(rc == 1))
+                       RETURN(0);
+       }
+
+       RETURN(rc);
 }
 
 int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
-                      const struct lu_fid *fid, struct thandle *th)
+                      const struct lu_fid *fid, handle_t *th)
 {
        struct osd_obj_map      *map;
        struct osd_obj_seq      *osd_seq;
@@ -572,86 +1031,230 @@ int osd_obj_map_delete(struct osd_thread_info *info, struct osd_device *osd,
         LASSERT(map);
 
        /* map fid to seq:objid */
-        fid_ostid_pack(fid, ostid);
+        fid_to_ostid(fid, ostid);
 
-       osd_seq = osd_seq_load(osd, ostid->oi_seq);
+       osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
        if (IS_ERR(osd_seq))
                GOTO(cleanup, rc = PTR_ERR(osd_seq));
 
-       dirn = ostid->oi_id & (osd_seq->oos_subdir_count - 1);
+       dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
        d = osd_seq->oos_dirs[dirn];
        LASSERT(d);
 
-       osd_oid_name(name, fid, ostid->oi_id);
+       osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
        rc = osd_obj_del_entry(info, osd, d, name, th);
 cleanup:
         RETURN(rc);
 }
 
-struct named_oid {
-        unsigned long  oid;
-        char          *name;
-};
-
-static const struct named_oid oids[] = {
-       { FLD_INDEX_OID,        "fld" },
-       { FID_SEQ_CTL_OID,      "seq_ctl" },
-       { FID_SEQ_SRV_OID,      "seq_srv" },
-       { MDD_ROOT_INDEX_OID,   "" /* "ROOT" */ },
-       { MDD_ORPHAN_OID,       "" /* "PENDING" */ },
-       { MDD_LOV_OBJ_OID,      LOV_OBJID },
-       { MDD_CAPA_KEYS_OID,    "" /* CAPA_KEYS */ },
-       { MDT_LAST_RECV_OID,    LAST_RCVD },
-       { LFSCK_BOOKMARK_OID,   "" /* "lfsck_bookmark" */ },
-       { OTABLE_IT_OID,        "" /* "otable iterator" */},
-       { OFD_LAST_RECV_OID,    LAST_RCVD },
-       { OFD_LAST_GROUP_OID,   "LAST_GROUP" },
-       { LLOG_CATALOGS_OID,    "CATALOGS" },
-       { MGS_CONFIGS_OID,      "" /* MOUNT_CONFIGS_DIR */ },
-       { OFD_HEALTH_CHECK_OID, HEALTH_CHECK },
-       { MDD_LOV_OBJ_OSEQ,     LOV_OBJSEQ },
-       { 0,                    NULL }
-};
-
-static char *oid2name(const unsigned long oid)
+int osd_obj_map_update(struct osd_thread_info *info,
+                      struct osd_device *osd,
+                      const struct lu_fid *fid,
+                      const struct osd_inode_id *id,
+                      handle_t *th)
 {
-        int i = 0;
+       struct osd_obj_seq      *osd_seq;
+       struct dentry           *d;
+       struct ost_id           *ostid = &info->oti_ostid;
+       int                     dirn, rc = 0;
+       char                    name[32];
+       ENTRY;
 
-        while (oids[i].oid) {
-                if (oids[i].oid == oid)
-                        return oids[i].name;
-                i++;
-        }
-        return NULL;
+       fid_to_ostid(fid, ostid);
+       osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
+       if (IS_ERR(osd_seq))
+               RETURN(PTR_ERR(osd_seq));
+
+       dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
+       d = osd_seq->oos_dirs[dirn];
+       LASSERT(d);
+
+       osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
+       rc = osd_obj_update_entry(info, osd, d, name, fid, id, th);
+
+       RETURN(rc);
 }
 
-int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
-                       const struct lu_fid *fid,
-                       const struct osd_inode_id *id,
-                       struct thandle *th)
+int osd_obj_map_recover(struct osd_thread_info *info,
+                       struct osd_device *osd,
+                       struct inode *src_parent,
+                       struct dentry *src_child,
+                       const struct lu_fid *fid)
 {
-       struct osd_obj_map      *map = osd->od_ost_map;
-       struct dentry           *root = osd_sb(osd)->s_root;
-       char                    *name;
-       int                     rc = 0;
+       struct osd_obj_seq         *osd_seq;
+       struct dentry              *tgt_parent;
+       struct dentry              *tgt_child = &info->oti_child_dentry;
+       struct inode               *dir;
+       struct inode               *inode     = src_child->d_inode;
+       struct ost_id              *ostid     = &info->oti_ostid;
+       handle_t                   *jh;
+       struct ldiskfs_dir_entry_2 *de;
+       struct buffer_head         *bh;
+       char                        name[32];
+       int                         dirn;
+       int                         rc        = 0;
        ENTRY;
 
        if (fid_is_last_id(fid)) {
-               struct osd_obj_seq      *osd_seq;
+               osd_seq = osd_seq_load(info, osd, fid_seq(fid));
+               if (IS_ERR(osd_seq))
+                       RETURN(PTR_ERR(osd_seq));
 
-               /* on creation of LAST_ID we create O/<seq> hierarchy */
-               LASSERT(map);
-               osd_seq = osd_seq_load(osd, fid_seq(fid));
+               tgt_parent = osd_seq->oos_root;
+               tgt_child->d_name.name = "LAST_ID";
+               tgt_child->d_name.len = strlen("LAST_ID");
+       } else {
+               fid_to_ostid(fid, ostid);
+               osd_seq = osd_seq_load(info, osd, ostid_seq(ostid));
                if (IS_ERR(osd_seq))
                        RETURN(PTR_ERR(osd_seq));
-               rc = osd_obj_add_entry(info, osd, osd_seq->oos_root,
-                                      "LAST_ID", id, th);
+
+               dirn = ostid_id(ostid) & (osd_seq->oos_subdir_count - 1);
+               tgt_parent = osd_seq->oos_dirs[dirn];
+               osd_oid_name(name, sizeof(name), fid, ostid_id(ostid));
+               tgt_child->d_name.name = name;
+               tgt_child->d_name.len = strlen(name);
+       }
+       LASSERT(tgt_parent != NULL);
+
+       dir = tgt_parent->d_inode;
+       tgt_child->d_name.hash = 0;
+       tgt_child->d_parent = tgt_parent;
+       tgt_child->d_inode = inode;
+
+       /* The non-initialized src_child may be destroyed. */
+       jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC,
+                               osd_dto_credits_noquota[DTO_INDEX_DELETE] +
+                               osd_dto_credits_noquota[DTO_INDEX_INSERT] +
+                               osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
+       if (IS_ERR(jh))
+               RETURN(PTR_ERR(jh));
+
+       ll_vfs_dq_init(src_parent);
+       ll_vfs_dq_init(dir);
+
+       mutex_lock(&src_parent->i_mutex);
+       mutex_lock(&dir->i_mutex);
+       bh = osd_ldiskfs_find_entry(dir, &tgt_child->d_name, &de, NULL, NULL);
+       if (bh != NULL) {
+               /* XXX: If some other object occupied the same slot. And If such
+                *      inode is zero-sized and with SUID+SGID, then means it is
+                *      a new created one. Maybe we can remove it and insert the
+                *      original one back to the /O/<seq>/d<x>. But there are
+                *      something to be considered:
+                *
+                *      1) The OST-object under /lost+found has crashed LMA.
+                *         So it should not conflict with the current one.
+                *
+                *      2) There are race conditions that: someone may just want
+                *         to modify the current one. Even if the OI scrub takes
+                *         the object lock when remove the current one, it still
+                *         cause the modification to be lost becasue the target
+                *         has been removed when the RPC service thread waiting
+                *         for the lock.
+                *
+                *      So keep it there before we have suitable solution. */
+               brelse(bh);
+               mutex_unlock(&dir->i_mutex);
+               mutex_unlock(&src_parent->i_mutex);
+               ldiskfs_journal_stop(jh);
+
+               rc = -EEXIST;
+               /* If the src object has never been modified, then remove it. */
+               if (inode->i_size == 0 && inode->i_mode & S_ISUID &&
+                   inode->i_mode & S_ISGID) {
+                       rc = ll_vfs_unlink(src_parent, src_child);
+                       if (unlikely(rc == -ENOENT))
+                               rc = 0;
+               }
+               RETURN(rc);
+       }
+
+       bh = osd_ldiskfs_find_entry(src_parent, &src_child->d_name, &de,
+                                   NULL, NULL);
+       if (unlikely(bh == NULL))
+               GOTO(unlock, rc = -ENOENT);
+
+       rc = ldiskfs_delete_entry(jh, src_parent, de, bh);
+       brelse(bh);
+       if (rc != 0)
+               GOTO(unlock, rc);
+
+       rc = osd_ldiskfs_add_entry(info, jh, tgt_child, inode, NULL);
+
+       GOTO(unlock, rc);
+
+unlock:
+       mutex_unlock(&dir->i_mutex);
+       mutex_unlock(&src_parent->i_mutex);
+       ldiskfs_journal_stop(jh);
+       return rc;
+}
+
+static struct dentry *
+osd_object_spec_find(struct osd_thread_info *info, struct osd_device *osd,
+                    const struct lu_fid *fid, char **name)
+{
+       struct dentry *root = ERR_PTR(-ENOENT);
+
+       if (fid_is_last_id(fid)) {
+               struct osd_obj_seq *osd_seq;
+
+               /* on creation of LAST_ID we create O/<seq> hierarchy */
+               osd_seq = osd_seq_load(info, osd, fid_seq(fid));
+               if (IS_ERR(osd_seq))
+                       RETURN((struct dentry *)osd_seq);
+
+               *name = "LAST_ID";
+               root = osd_seq->oos_root;
        } else {
-               name = oid2name(fid_oid(fid));
-               if (name == NULL)
+               *name = osd_lf_fid2name(fid);
+               if (*name == NULL)
                        CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
-               else if (name[0])
-                       rc = osd_obj_add_entry(info, osd, root, name, id, th);
+               else if ((*name)[0])
+                       root = osd_sb(osd)->s_root;
+       }
+
+       return root;
+}
+
+int osd_obj_spec_update(struct osd_thread_info *info, struct osd_device *osd,
+                       const struct lu_fid *fid, const struct osd_inode_id *id,
+                       handle_t *th)
+{
+       struct dentry   *root;
+       char            *name = NULL;
+       int              rc;
+       ENTRY;
+
+       root = osd_object_spec_find(info, osd, fid, &name);
+       if (!IS_ERR(root)) {
+               rc = osd_obj_update_entry(info, osd, root, name, fid, id, th);
+       } else {
+               rc = PTR_ERR(root);
+               if (rc == -ENOENT)
+                       rc = 1;
+       }
+
+       RETURN(rc);
+}
+
+int osd_obj_spec_insert(struct osd_thread_info *info, struct osd_device *osd,
+                       const struct lu_fid *fid, const struct osd_inode_id *id,
+                       handle_t *th)
+{
+       struct dentry   *root;
+       char            *name = NULL;
+       int              rc;
+       ENTRY;
+
+       root = osd_object_spec_find(info, osd, fid, &name);
+       if (!IS_ERR(root)) {
+               rc = osd_obj_add_entry(info, osd, root, name, id, th);
+       } else {
+               rc = PTR_ERR(root);
+               if (rc == -ENOENT)
+                       rc = 0;
        }
 
        RETURN(rc);
@@ -661,23 +1264,23 @@ int osd_obj_spec_lookup(struct osd_thread_info *info, struct osd_device *osd,
                        const struct lu_fid *fid, struct osd_inode_id *id)
 {
        struct dentry   *root;
-       struct dentry *dentry;
-       struct inode  *inode;
-       char          *name;
-       int            rc = -ENOENT;
+       struct dentry   *dentry;
+       struct inode    *inode;
+       char            *name = NULL;
+       int             rc = -ENOENT;
        ENTRY;
 
        if (fid_is_last_id(fid)) {
                struct osd_obj_seq *osd_seq;
 
-               osd_seq = osd_seq_load(osd, fid_seq(fid));
+               osd_seq = osd_seq_load(info, osd, fid_seq(fid));
                if (IS_ERR(osd_seq))
                        RETURN(PTR_ERR(osd_seq));
                root = osd_seq->oos_root;
                name = "LAST_ID";
        } else {
                root = osd_sb(osd)->s_root;
-               name = oid2name(fid_oid(fid));
+               name = osd_lf_fid2name(fid);
                if (name == NULL || strlen(name) == 0)
                        RETURN(-ENOENT);
        }