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LU-8510 dne: set osd_obj_ea_ops::dt_invalidate
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_handler.c
index 588d233..c08f11b 100644 (file)
@@ -27,7 +27,7 @@
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2013, Intel Corporation.
+ * Copyright (c) 2011, 2015, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
 #define DEBUG_SUBSYSTEM S_OSD
 
 #include <linux/module.h>
+#include <linux/user_namespace.h>
+#ifdef HAVE_UIDGID_HEADER
+# include <linux/uidgid.h>
+#endif
 
 /* LUSTRE_VERSION_CODE */
 #include <lustre_ver.h>
 /* XATTR_{REPLACE,CREATE} */
 #include <linux/xattr.h>
 
+#include <ldiskfs/ldiskfs.h>
+#include <ldiskfs/xattr.h>
+#include <ldiskfs/ldiskfs_extents.h>
+#undef ENTRY
 /*
  * struct OBD_{ALLOC,FREE}*()
  * OBD_FAIL_CHECK
 #include <md_object.h>
 #include <lustre_quota.h>
 
-#include <ldiskfs/xattr.h>
 #include <lustre_linkea.h>
 
 int ldiskfs_pdo = 1;
-CFS_MODULE_PARM(ldiskfs_pdo, "i", int, 0644,
-                "ldiskfs with parallel directory operations");
+module_param(ldiskfs_pdo, int, 0644);
+MODULE_PARM_DESC(ldiskfs_pdo, "ldiskfs with parallel directory operations");
 
 int ldiskfs_track_declares_assert;
-CFS_MODULE_PARM(ldiskfs_track_declares_assert, "i", int, 0644,
-               "LBUG during tracking of declares");
+module_param(ldiskfs_track_declares_assert, int, 0644);
+MODULE_PARM_DESC(ldiskfs_track_declares_assert, "LBUG during tracking of declares");
 
 /* Slab to allocate dynlocks */
 struct kmem_cache *dynlock_cachep;
 
+/* Slab to allocate osd_it_ea */
+struct kmem_cache *osd_itea_cachep;
+
 static struct lu_kmem_descr ldiskfs_caches[] = {
        {
                .ckd_cache = &dynlock_cachep,
@@ -93,6 +103,11 @@ static struct lu_kmem_descr ldiskfs_caches[] = {
                .ckd_size  = sizeof(struct dynlock_handle)
        },
        {
+               .ckd_cache = &osd_itea_cachep,
+               .ckd_name  = "osd_itea_cache",
+               .ckd_size  = sizeof(struct osd_it_ea)
+       },
+       {
                .ckd_cache = NULL
        }
 };
@@ -108,6 +123,11 @@ static const struct dt_object_operations      osd_obj_otable_it_ops;
 static const struct dt_index_operations       osd_index_iam_ops;
 static const struct dt_index_operations       osd_index_ea_ops;
 
+static int osd_remote_fid(const struct lu_env *env, struct osd_device *osd,
+                         const struct lu_fid *fid);
+static int osd_process_scheduled_agent_removals(const struct lu_env *env,
+                                               struct osd_device *osd);
+
 int osd_trans_declare_op2rb[] = {
        [OSD_OT_ATTR_SET]       = OSD_OT_ATTR_SET,
        [OSD_OT_PUNCH]          = OSD_OT_MAX,
@@ -119,7 +139,6 @@ int osd_trans_declare_op2rb[] = {
        [OSD_OT_WRITE]          = OSD_OT_WRITE,
        [OSD_OT_INSERT]         = OSD_OT_DELETE,
        [OSD_OT_DELETE]         = OSD_OT_INSERT,
-       [OSD_OT_UPDATE]         = OSD_OT_MAX,
        [OSD_OT_QUOTA]          = OSD_OT_MAX,
 };
 
@@ -157,6 +176,153 @@ static int osd_root_get(const struct lu_env *env,
 }
 
 /*
+ * the following set of functions are used to maintain per-thread
+ * cache of FID->ino mapping. this mechanism is needed to resolve
+ * FID to inode at dt_insert() which in turn stores ino in the
+ * directory entries to keep ldiskfs compatible with ext[34].
+ * due to locking-originated restrictions we can't lookup ino
+ * using LU cache (deadlock is possible). lookup using OI is quite
+ * expensive. so instead we maintain this cache and methods like
+ * dt_create() fill it. so in the majority of cases dt_insert() is
+ * able to find needed mapping in lockless manner.
+ */
+static struct osd_idmap_cache *
+osd_idc_find(const struct lu_env *env, struct osd_device *osd,
+            const struct lu_fid *fid)
+{
+       struct osd_thread_info  *oti   = osd_oti_get(env);
+       struct osd_idmap_cache  *idc    = oti->oti_ins_cache;
+       int i;
+       for (i = 0; i < oti->oti_ins_cache_used; i++) {
+               if (!lu_fid_eq(&idc[i].oic_fid, fid))
+                       continue;
+               if (idc[i].oic_dev != osd)
+                       continue;
+
+               return idc + i;
+       }
+
+       return NULL;
+}
+
+static struct osd_idmap_cache *
+osd_idc_add(const struct lu_env *env, struct osd_device *osd,
+           const struct lu_fid *fid)
+{
+       struct osd_thread_info  *oti   = osd_oti_get(env);
+       struct osd_idmap_cache  *idc;
+       int i;
+
+       if (unlikely(oti->oti_ins_cache_used >= oti->oti_ins_cache_size)) {
+               i = oti->oti_ins_cache_size * 2;
+               if (i == 0)
+                       i = OSD_INS_CACHE_SIZE;
+               OBD_ALLOC(idc, sizeof(*idc) * i);
+               if (idc == NULL)
+                       return ERR_PTR(-ENOMEM);
+               if (oti->oti_ins_cache != NULL) {
+                       memcpy(idc, oti->oti_ins_cache,
+                              oti->oti_ins_cache_used * sizeof(*idc));
+                       OBD_FREE(oti->oti_ins_cache,
+                                oti->oti_ins_cache_used * sizeof(*idc));
+               }
+               oti->oti_ins_cache = idc;
+               oti->oti_ins_cache_size = i;
+       }
+
+       idc = oti->oti_ins_cache + oti->oti_ins_cache_used++;
+       idc->oic_fid = *fid;
+       idc->oic_dev = osd;
+       idc->oic_lid.oii_ino = 0;
+       idc->oic_lid.oii_gen = 0;
+       idc->oic_remote = 0;
+
+       return idc;
+}
+
+/*
+ * lookup mapping for the given fid in the cache, initialize a
+ * new one if not found. the initialization checks whether the
+ * object is local or remote. for local objects, OI is used to
+ * learn ino/generation. the function is used when the caller
+ * has no information about the object, e.g. at dt_insert().
+ */
+static struct osd_idmap_cache *
+osd_idc_find_or_init(const struct lu_env *env, struct osd_device *osd,
+                    const struct lu_fid *fid)
+{
+       struct osd_idmap_cache *idc;
+       int rc;
+
+       idc = osd_idc_find(env, osd, fid);
+       LASSERT(!IS_ERR(idc));
+       if (idc != NULL)
+               return idc;
+
+       /* new mapping is needed */
+       idc = osd_idc_add(env, osd, fid);
+       if (IS_ERR(idc))
+               return idc;
+
+       /* initialize it */
+       rc = osd_remote_fid(env, osd, fid);
+       if (unlikely(rc < 0))
+               return ERR_PTR(rc);
+
+       if (rc == 0) {
+               /* the object is local, lookup in OI */
+               /* XXX: probably cheaper to lookup in LU first? */
+               rc = osd_oi_lookup(osd_oti_get(env), osd, fid,
+                                  &idc->oic_lid, 0);
+               if (unlikely(rc < 0)) {
+                       CERROR("can't lookup: rc = %d\n", rc);
+                       return ERR_PTR(rc);
+               }
+       } else {
+               /* the object is remote */
+               idc->oic_remote = 1;
+       }
+
+       return idc;
+}
+
+/*
+ * lookup mapping for given FID and fill it from the given object.
+ * the object is lolcal by definition.
+ */
+static int osd_idc_find_and_init(const struct lu_env *env,
+                                struct osd_device *osd,
+                                struct osd_object *obj)
+{
+       const struct lu_fid     *fid = lu_object_fid(&obj->oo_dt.do_lu);
+       struct osd_idmap_cache  *idc;
+
+       idc = osd_idc_find(env, osd, fid);
+       LASSERT(!IS_ERR(idc));
+       if (idc != NULL) {
+               if (obj->oo_inode == NULL)
+                       return 0;
+               if (idc->oic_lid.oii_ino != obj->oo_inode->i_ino) {
+                       LASSERT(idc->oic_lid.oii_ino == 0);
+                       idc->oic_lid.oii_ino = obj->oo_inode->i_ino;
+                       idc->oic_lid.oii_gen = obj->oo_inode->i_generation;
+               }
+               return 0;
+       }
+
+       /* new mapping is needed */
+       idc = osd_idc_add(env, osd, fid);
+       if (IS_ERR(idc))
+               return PTR_ERR(idc);
+
+       if (obj->oo_inode != NULL) {
+               idc->oic_lid.oii_ino = obj->oo_inode->i_ino;
+               idc->oic_lid.oii_gen = obj->oo_inode->i_generation;
+       }
+       return 0;
+}
+
+/*
  * OSD object methods.
  */
 
@@ -181,6 +347,7 @@ static struct lu_object *osd_object_alloc(const struct lu_env *env,
                init_rwsem(&mo->oo_sem);
                init_rwsem(&mo->oo_ext_idx_sem);
                spin_lock_init(&mo->oo_guard);
+               INIT_LIST_HEAD(&mo->oo_xattr_list);
                 return l;
         } else {
                 return NULL;
@@ -224,6 +391,11 @@ struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
 {
        struct inode *inode = NULL;
 
+       /* if we look for an inode withing a running
+        * transaction, then we risk to deadlock */
+       /* osd_dirent_check_repair() breaks this */
+       /*LASSERT(current->journal_info == NULL);*/
+
        inode = ldiskfs_iget(osd_sb(dev), id->oii_ino);
        if (IS_ERR(inode)) {
                CDEBUG(D_INODE, "no inode: ino = %u, rc = %ld\n",
@@ -247,6 +419,7 @@ struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
                iput(inode);
                inode = ERR_PTR(-ENOENT);
        } else {
+               ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);
                if (id->oii_gen == OSD_OII_NOGEN)
                        osd_id_gen(id, inode->i_ino, inode->i_generation);
 
@@ -261,6 +434,53 @@ struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
        return inode;
 }
 
+int osd_ldiskfs_add_entry(struct osd_thread_info *info,
+                         handle_t *handle, struct dentry *child,
+                         struct inode *inode, struct htree_lock *hlock)
+{
+       int rc, rc2;
+
+       rc = __ldiskfs_add_entry(handle, child, inode, hlock);
+       if (rc == -ENOBUFS || rc == -ENOSPC) {
+               char fidbuf[FID_LEN + 1];
+               struct lustre_mdt_attrs lma;
+               struct lu_fid fid = { };
+               char *errstr;
+               struct dentry *p_dentry = child->d_parent;
+
+               rc2 = osd_get_lma(info, p_dentry->d_inode, p_dentry,
+                                &lma);
+               if (rc2 == 0) {
+                       fid = lma.lma_self_fid;
+                       snprintf(fidbuf, sizeof(fidbuf), DFID, PFID(&fid));
+               } else if (rc2 == -ENODATA) {
+                       if (unlikely(p_dentry->d_inode ==
+                                    inode->i_sb->s_root->d_inode))
+                               lu_local_obj_fid(&fid, OSD_FS_ROOT_OID);
+                       else if (info->oti_dev && !info->oti_dev->od_is_ost &&
+                                fid_seq_is_mdt0(fid_seq(&fid)))
+                               lu_igif_build(&fid, p_dentry->d_inode->i_ino,
+                                             p_dentry->d_inode->i_generation);
+                       snprintf(fidbuf, sizeof(fidbuf), DFID, PFID(&fid));
+               } else {
+                       snprintf(fidbuf, FID_LEN, "%s", "unknown");
+               }
+
+               if (rc == -ENOSPC)
+                       errstr = "has reached";
+               else
+                       errstr = "is approaching";
+               CWARN("%.16s: directory (inode: %lu FID: %s) %s maximum entry limit\n",
+                       LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
+                       p_dentry->d_inode->i_ino, fidbuf, errstr);
+               /* ignore such error now */
+               if (rc == -ENOBUFS)
+                       rc = 0;
+       }
+       return rc;
+}
+
+
 static struct inode *
 osd_iget_fid(struct osd_thread_info *info, struct osd_device *dev,
             struct osd_inode_id *id, struct lu_fid *fid)
@@ -292,16 +512,20 @@ static struct inode *osd_iget_check(struct osd_thread_info *info,
                                    struct osd_device *dev,
                                    const struct lu_fid *fid,
                                    struct osd_inode_id *id,
-                                   bool in_oi)
+                                   bool cached)
 {
        struct inode    *inode;
        int              rc     = 0;
        ENTRY;
 
+       /* The cached OI mapping is trustable. If we cannot locate the inode
+        * via the cached OI mapping, then return the failure to the caller
+        * directly without further OI checking. */
+
        inode = ldiskfs_iget(osd_sb(dev), id->oii_ino);
        if (IS_ERR(inode)) {
                rc = PTR_ERR(inode);
-               if (!in_oi || (rc != -ENOENT && rc != -ESTALE)) {
+               if (cached || (rc != -ENOENT && rc != -ESTALE)) {
                        CDEBUG(D_INODE, "no inode: ino = %u, rc = %d\n",
                               id->oii_ino, rc);
 
@@ -313,7 +537,7 @@ static struct inode *osd_iget_check(struct osd_thread_info *info,
 
        if (is_bad_inode(inode)) {
                rc = -ENOENT;
-               if (!in_oi) {
+               if (cached) {
                        CDEBUG(D_INODE, "bad inode: ino = %u\n", id->oii_ino);
 
                        GOTO(put, rc);
@@ -325,7 +549,7 @@ static struct inode *osd_iget_check(struct osd_thread_info *info,
        if (id->oii_gen != OSD_OII_NOGEN &&
            inode->i_generation != id->oii_gen) {
                rc = -ESTALE;
-               if (!in_oi) {
+               if (cached) {
                        CDEBUG(D_INODE, "unmatched inode: ino = %u, "
                               "oii_gen = %u, i_generation = %u\n",
                               id->oii_ino, id->oii_gen, inode->i_generation);
@@ -338,7 +562,7 @@ static struct inode *osd_iget_check(struct osd_thread_info *info,
 
        if (inode->i_nlink == 0) {
                rc = -ENOENT;
-               if (!in_oi) {
+               if (cached) {
                        CDEBUG(D_INODE, "stale inode: ino = %u\n", id->oii_ino);
 
                        GOTO(put, rc);
@@ -347,12 +571,14 @@ static struct inode *osd_iget_check(struct osd_thread_info *info,
                goto check_oi;
        }
 
+       ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);
+
 check_oi:
        if (rc != 0) {
                LASSERTF(rc == -ESTALE || rc == -ENOENT, "rc = %d\n", rc);
 
                rc = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
-               /* XXX: There are some possible cases:
+               /* XXX: There are four possible cases:
                 *      1. rc = 0.
                 *         Backup/restore caused the OI invalid.
                 *      2. rc = 0.
@@ -371,9 +597,16 @@ check_oi:
                if (rc == 0) {
                        if (!IS_ERR(inode) && inode->i_generation != 0 &&
                            inode->i_generation == id->oii_gen)
+                               /* "id->oii_gen != OSD_OII_NOGEN" is for
+                                * "@cached == false" case. */
                                rc = -ENOENT;
                        else
                                rc = -EREMCHG;
+               } else {
+                       /* If the OI mapping was in OI file before the
+                        * osd_iget_check(), but now, it is disappear,
+                        * then it must be removed by race. That is a
+                        * normal race case. */
                }
        } else {
                if (id->oii_gen == OSD_OII_NOGEN)
@@ -418,7 +651,8 @@ int osd_get_idif(struct osd_thread_info *info, struct inode *inode,
                rc = 0;
                ostid_set_seq(ostid, le64_to_cpu(ff->ff_seq));
                ostid_set_id(ostid, le64_to_cpu(ff->ff_objid));
-               /* XXX: should use real OST index in the future. LU-3569 */
+               /* XXX: use 0 as the index for compatibility, the caller will
+                *      handle index related issues when necessarry. */
                ostid_to_fid(fid, ostid, 0);
        } else if (rc == sizeof(struct filter_fid)) {
                rc = 1;
@@ -473,22 +707,18 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
        if (rc == -ENODATA && !fid_is_igif(rfid) && osd->od_check_ff) {
                fid = &lma->lma_self_fid;
                rc = osd_get_idif(info, inode, dentry, fid);
-               if ((rc > 0) || (rc == -ENODATA && osd->od_lma_self_repair)) {
+               if ((rc > 0) || (rc == -ENODATA && osd->od_index_in_idif)) {
                        /* For the given OST-object, if it has neither LMA nor
                         * FID in XATTR_NAME_FID, then the given FID (which is
                         * contained in the @obj, from client RPC for locating
                         * the OST-object) is trusted. We use it to generate
                         * the LMA. */
                        osd_lma_self_repair(info, osd, inode, rfid,
-                               fid_is_on_ost(info, osd, fid, OI_CHECK_FLD) ?
-                               LMAC_FID_ON_OST : 0);
+                                           LMAC_FID_ON_OST);
                        RETURN(0);
                }
        }
 
-       if (unlikely(rc == -ENODATA))
-               RETURN(0);
-
        if (rc < 0)
                RETURN(rc);
 
@@ -502,7 +732,7 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
                              lma->lma_incompat & ~LMA_INCOMPAT_SUPP,
                              PFID(rfid), inode->i_ino);
                        rc = -EOPNOTSUPP;
-               } else if (!(lma->lma_compat & LMAC_NOT_IN_OI)) {
+               } else {
                        fid = &lma->lma_self_fid;
                }
        }
@@ -522,7 +752,7 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
                                fid_to_ostid(fid, oi);
                                ostid_to_fid(fid1, oi, idx);
                                if (lu_fid_eq(fid1, rfid)) {
-                                       if (osd->od_lma_self_repair)
+                                       if (osd->od_index_in_idif)
                                                osd_lma_self_repair(info, osd,
                                                        inode, rfid,
                                                        LMAC_FID_ON_OST);
@@ -531,8 +761,6 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
                        }
                }
 
-               CDEBUG(D_INODE, "%s: FID "DFID" != self_fid "DFID"\n",
-                      osd_name(osd), PFID(rfid), PFID(fid));
                rc = -EREMCHG;
        }
 
@@ -548,13 +776,15 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
        struct osd_device      *dev;
        struct osd_idmap_cache *oic;
        struct osd_inode_id    *id;
-       struct inode           *inode;
+       struct inode           *inode = NULL;
        struct osd_scrub       *scrub;
        struct scrub_file      *sf;
-       int                     result;
-       int                     saved  = 0;
-       bool                    in_oi  = false;
-       bool                    triggered = false;
+       __u32                   flags = SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT |
+                                       SS_AUTO_FULL;
+       int                     result  = 0;
+       int                     rc1     = 0;
+       bool                    cached  = true;
+       bool                    remote  = false;
        ENTRY;
 
        LINVRNT(osd_invariant(obj));
@@ -568,7 +798,7 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
        LASSERT(info);
        oic = &info->oti_cache;
 
-       if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOENT))
+       if (OBD_FAIL_CHECK(OBD_FAIL_SRV_ENOENT))
                RETURN(-ENOENT);
 
        /* For the object is created as locking anchor, or for the object to
@@ -594,10 +824,11 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
                        goto iget;
        }
 
+       cached = false;
        /* Search order: 3. OI files. */
        result = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
        if (result == -ENOENT) {
-               if (!fid_is_norm(fid) ||
+               if (!(fid_is_norm(fid) || fid_is_igif(fid)) ||
                    fid_is_on_ost(info, dev, fid, OI_CHECK_FLD) ||
                    !ldiskfs_test_bit(osd_oi_fid2idx(dev,fid),
                                      sf->sf_oi_bitmap))
@@ -609,44 +840,16 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
        if (result != 0)
                GOTO(out, result);
 
-       in_oi = true;
-
 iget:
-       inode = osd_iget_check(info, dev, fid, id, in_oi);
+       inode = osd_iget_check(info, dev, fid, id, cached);
        if (IS_ERR(inode)) {
                result = PTR_ERR(inode);
-               if (result == -ENOENT || result == -ESTALE) {
-                       if (!in_oi)
-                               fid_zero(&oic->oic_fid);
-
+               if (result == -ENOENT || result == -ESTALE)
                        GOTO(out, result = -ENOENT);
-               } else if (result == -EREMCHG) {
 
-trigger:
-                       if (!in_oi)
-                               fid_zero(&oic->oic_fid);
-
-                       if (unlikely(triggered))
-                               GOTO(out, result = saved);
-
-                       triggered = true;
-                       if (thread_is_running(&scrub->os_thread)) {
-                               result = -EINPROGRESS;
-                       } else if (!dev->od_noscrub) {
-                               /* Since we do not know the right OI mapping,
-                                * we have to trigger OI scrub to scan the
-                                * whole device. */
-                               result = osd_scrub_start(dev, SS_AUTO_FULL |
-                                       SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT);
-                               LCONSOLE_WARN("%.16s: trigger OI scrub by RPC "
-                                             "for "DFID", rc = %d [1]\n",
-                                             osd_name(dev), PFID(fid),result);
-                               if (result == 0 || result == -EALREADY)
-                                       result = -EINPROGRESS;
-                               else
-                                       result = -EREMCHG;
-                       }
+               if (result == -EREMCHG) {
 
+trigger:
                        /* We still have chance to get the valid inode: for the
                         * object which is referenced by remote name entry, the
                         * object on the local MDT will be linked under the dir
@@ -662,47 +865,132 @@ trigger:
                         * only happened for the RPC from other MDT during the
                         * OI scrub, or for the client side RPC with FID only,
                         * such as FID to path, or from old connected client. */
-                       saved = result;
-                       result = osd_lookup_in_remote_parent(info, dev,
-                                                            fid, id);
-                       if (result == 0) {
-                               in_oi = false;
-                               goto iget;
+                       if (!remote &&
+                           !fid_is_on_ost(info, dev, fid, OI_CHECK_FLD)) {
+                               rc1 = osd_lookup_in_remote_parent(info, dev,
+                                                                 fid, id);
+                               if (rc1 == 0) {
+                                       remote = true;
+                                       cached = true;
+                                       flags |= SS_AUTO_PARTIAL;
+                                       flags &= ~SS_AUTO_FULL;
+                                       goto iget;
+                               }
                        }
 
-                       result = saved;
+                       if (thread_is_running(&scrub->os_thread)) {
+                               if (scrub->os_partial_scan &&
+                                   !scrub->os_in_join) {
+                                       goto join;
+                               } else {
+                                       if (inode != NULL && !IS_ERR(inode)) {
+                                               LASSERT(remote);
+
+                                               osd_add_oi_cache(info, dev, id,
+                                                                fid);
+                                               osd_oii_insert(dev, oic, true);
+                                       } else {
+                                               result = -EINPROGRESS;
+                                       }
+                               }
+                       } else if (!dev->od_noscrub) {
+
+join:
+                               rc1 = osd_scrub_start(dev, flags);
+                               LCONSOLE_WARN("%.16s: trigger OI scrub by RPC "
+                                             "for the "DFID" with flags 0x%x,"
+                                             " rc = %d\n", osd_name(dev),
+                                             PFID(fid), flags, rc1);
+                               if (rc1 == 0 || rc1 == -EALREADY) {
+                                       if (inode != NULL && !IS_ERR(inode)) {
+                                               LASSERT(remote);
+
+                                               osd_add_oi_cache(info, dev, id,
+                                                                fid);
+                                               osd_oii_insert(dev, oic, true);
+                                       } else {
+                                               result = -EINPROGRESS;
+                                       }
+                               } else {
+                                       result = -EREMCHG;
+                               }
+                       } else {
+                               result = -EREMCHG;
+                       }
                }
 
-                GOTO(out, result);
-        }
+               if (inode == NULL || IS_ERR(inode))
+                       GOTO(out, result);
+       } else if (remote) {
+               goto trigger;
+       }
 
-        obj->oo_inode = inode;
-        LASSERT(obj->oo_inode->i_sb == osd_sb(dev));
+       obj->oo_inode = inode;
+       LASSERT(obj->oo_inode->i_sb == osd_sb(dev));
 
        result = osd_check_lma(env, obj);
        if (result != 0) {
-               iput(inode);
-               obj->oo_inode = NULL;
-               if (result == -EREMCHG) {
-                       if (!in_oi) {
+               if (result == -ENODATA) {
+                       if (cached) {
                                result = osd_oi_lookup(info, dev, fid, id,
                                                       OI_CHECK_FLD);
                                if (result != 0) {
-                                       fid_zero(&oic->oic_fid);
+                                       /* result == -ENOENT means that the OI
+                                        * mapping has been removed by race,
+                                        * the target inode belongs to other
+                                        * object.
+                                        *
+                                        * Others error also can be returned
+                                        * directly. */
+                                       iput(inode);
+                                       obj->oo_inode = NULL;
                                        GOTO(out, result);
+                               } else {
+                                       /* result == 0 means the cached OI
+                                        * mapping is still in the OI file,
+                                        * the target the inode is valid. */
                                }
+                       } else {
+                               /* The current OI mapping is from the OI file,
+                                * since the inode has been found via
+                                * osd_iget_check(), no need recheck OI. */
                        }
 
-                       goto trigger;
+                       goto found;
                }
 
-               GOTO(out, result);
+               iput(inode);
+               inode = NULL;
+               obj->oo_inode = NULL;
+               if (result != -EREMCHG)
+                       GOTO(out, result);
+
+               if (cached) {
+                       result = osd_oi_lookup(info, dev, fid, id,
+                                              OI_CHECK_FLD);
+                       /* result == -ENOENT means the cached OI mapping
+                        * has been removed from the OI file by race,
+                        * above target inode belongs to other object.
+                        *
+                        * Others error also can be returned directly. */
+                       if (result != 0)
+                               GOTO(out, result);
+
+                       /* result == 0, goto trigger */
+               } else {
+                       /* The current OI mapping is from the OI file,
+                        * since the inode has been found via
+                        * osd_iget_check(), no need recheck OI. */
+               }
+
+               goto trigger;
        }
 
+found:
        obj->oo_compat_dot_created = 1;
        obj->oo_compat_dotdot_created = 1;
 
-        if (!S_ISDIR(inode->i_mode) || !ldiskfs_pdo) /* done */
+       if (!S_ISDIR(inode->i_mode) || !ldiskfs_pdo) /* done */
                GOTO(out, result = 0);
 
        LASSERT(obj->oo_hl_head == NULL);
@@ -715,6 +1003,9 @@ trigger:
        GOTO(out, result = 0);
 
 out:
+       if (result != 0 && cached)
+               fid_zero(&oic->oic_fid);
+
        LINVRNT(osd_invariant(obj));
        return result;
 }
@@ -750,13 +1041,157 @@ static int osd_object_init(const struct lu_env *env, struct lu_object *l,
 
        result = osd_fid_lookup(env, obj, lu_object_fid(l), conf);
        obj->oo_dt.do_body_ops = &osd_body_ops_new;
-       if (result == 0 && obj->oo_inode != NULL)
+       if (result == 0 && obj->oo_inode != NULL) {
+               struct osd_thread_info *oti = osd_oti_get(env);
+               struct lustre_mdt_attrs *lma = &oti->oti_mdt_attrs;
+
                osd_object_init0(obj);
+               result = osd_get_lma(oti, obj->oo_inode,
+                                    &oti->oti_obj_dentry, lma);
+               if (result == 0) {
+                       /* Convert LMAI flags to lustre LMA flags
+                        * and cache it to oo_lma_flags */
+                       obj->oo_lma_flags =
+                               lma_to_lustre_flags(lma->lma_incompat);
+               } else if (result == -ENODATA) {
+                       result = 0;
+               }
+       }
 
        LINVRNT(osd_invariant(obj));
        return result;
 }
 
+/* The first part of oxe_buf is xattr name, and is '\0' terminated.
+ * The left part is for value, binary mode. */
+struct osd_xattr_entry {
+       struct list_head        oxe_list;
+       size_t                  oxe_len;
+       size_t                  oxe_namelen;
+       bool                    oxe_exist;
+       struct rcu_head         oxe_rcu;
+       char                    oxe_buf[0];
+};
+
+static struct osd_xattr_entry *osd_oxc_lookup(struct osd_object *obj,
+                                             const char *name,
+                                             size_t namelen)
+{
+       struct osd_xattr_entry *oxe;
+
+       list_for_each_entry(oxe, &obj->oo_xattr_list, oxe_list) {
+               if (namelen == oxe->oxe_namelen &&
+                   strncmp(name, oxe->oxe_buf, namelen) == 0)
+                       return oxe;
+       }
+
+       return NULL;
+}
+
+static int osd_oxc_get(struct osd_object *obj, const char *name,
+                      struct lu_buf *buf)
+{
+       struct osd_xattr_entry *oxe;
+       size_t vallen;
+       ENTRY;
+
+       rcu_read_lock();
+       oxe = osd_oxc_lookup(obj, name, strlen(name));
+       if (oxe == NULL) {
+               rcu_read_unlock();
+               RETURN(-ENOENT);
+       }
+
+       if (!oxe->oxe_exist) {
+               rcu_read_unlock();
+               RETURN(-ENODATA);
+       }
+
+       vallen = oxe->oxe_len - sizeof(*oxe) - oxe->oxe_namelen - 1;
+       LASSERT(vallen > 0);
+
+       if (buf->lb_buf == NULL) {
+               rcu_read_unlock();
+               RETURN(vallen);
+       }
+
+       if (buf->lb_len < vallen) {
+               rcu_read_unlock();
+               RETURN(-ERANGE);
+       }
+
+       memcpy(buf->lb_buf, oxe->oxe_buf + oxe->oxe_namelen + 1, vallen);
+       rcu_read_unlock();
+
+       RETURN(vallen);
+}
+
+static void osd_oxc_free(struct rcu_head *head)
+{
+       struct osd_xattr_entry *oxe;
+
+       oxe = container_of(head, struct osd_xattr_entry, oxe_rcu);
+       OBD_FREE(oxe, oxe->oxe_len);
+}
+
+static inline void __osd_oxc_del(struct osd_object *obj, const char *name)
+{
+       struct osd_xattr_entry *oxe;
+
+       oxe = osd_oxc_lookup(obj, name, strlen(name));
+       if (oxe != NULL) {
+               list_del(&oxe->oxe_list);
+               call_rcu(&oxe->oxe_rcu, osd_oxc_free);
+       }
+}
+
+static void osd_oxc_add(struct osd_object *obj, const char *name,
+                       const char *buf, int buflen)
+{
+       struct osd_xattr_entry *oxe;
+       size_t namelen = strlen(name);
+       size_t len = sizeof(*oxe) + namelen + 1 + buflen;
+
+       OBD_ALLOC(oxe, len);
+       if (oxe == NULL)
+               return;
+
+       INIT_LIST_HEAD(&oxe->oxe_list);
+       oxe->oxe_len = len;
+       oxe->oxe_namelen = namelen;
+       memcpy(oxe->oxe_buf, name, namelen);
+       if (buflen > 0) {
+               LASSERT(buf != NULL);
+               memcpy(oxe->oxe_buf + namelen + 1, buf, buflen);
+               oxe->oxe_exist = true;
+       } else {
+               oxe->oxe_exist = false;
+       }
+
+       /* this should be rarely called, just remove old and add new */
+       spin_lock(&obj->oo_guard);
+       __osd_oxc_del(obj, name);
+       list_add_tail(&oxe->oxe_list, &obj->oo_xattr_list);
+       spin_unlock(&obj->oo_guard);
+}
+
+static void osd_oxc_del(struct osd_object *obj, const char *name)
+{
+       spin_lock(&obj->oo_guard);
+       __osd_oxc_del(obj, name);
+       spin_unlock(&obj->oo_guard);
+}
+
+static void osd_oxc_fini(struct osd_object *obj)
+{
+       struct osd_xattr_entry *oxe, *next;
+
+       list_for_each_entry_safe(oxe, next, &obj->oo_xattr_list, oxe_list) {
+               list_del(&oxe->oxe_list);
+               OBD_FREE(oxe, oxe->oxe_len);
+       }
+}
+
 /*
  * Concurrency: no concurrent access is possible that late in object
  * life-cycle.
@@ -767,6 +1202,7 @@ static void osd_object_free(const struct lu_env *env, struct lu_object *l)
 
         LINVRNT(osd_invariant(obj));
 
+       osd_oxc_fini(obj);
         dt_object_fini(&obj->oo_dt);
         if (obj->oo_hl_head != NULL)
                 ldiskfs_htree_lock_head_free(obj->oo_hl_head);
@@ -917,7 +1353,8 @@ static void osd_trans_commit_cb(struct super_block *sb,
         dt_txn_hook_commit(th);
 
        /* call per-transaction callbacks if any */
-       list_for_each_entry_safe(dcb, tmp, &oh->ot_dcb_list, dcb_linkage) {
+       list_for_each_entry_safe(dcb, tmp, &oh->ot_commit_dcb_list,
+                                dcb_linkage) {
                LASSERTF(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC,
                         "commit callback entry: magic=%x name='%s'\n",
                         dcb->dcb_magic, dcb->dcb_name);
@@ -931,9 +1368,14 @@ static void osd_trans_commit_cb(struct super_block *sb,
 
         lu_context_exit(&th->th_ctx);
         lu_context_fini(&th->th_ctx);
-       thandle_put(th);
+       OBD_FREE_PTR(oh);
 }
 
+#ifndef HAVE_SB_START_WRITE
+# define sb_start_write(sb) do {} while (0)
+# define sb_end_write(sb) do {} while (0)
+#endif
+
 static struct thandle *osd_trans_create(const struct lu_env *env,
                                        struct dt_device *d)
 {
@@ -946,7 +1388,8 @@ static struct thandle *osd_trans_create(const struct lu_env *env,
        /* on pending IO in this thread should left from prev. request */
        LASSERT(atomic_read(&iobuf->dr_numreqs) == 0);
 
-       th = ERR_PTR(-ENOMEM);
+       sb_start_write(osd_sb(osd_dt_dev(d)));
+
        OBD_ALLOC_GFP(oh, sizeof *oh, GFP_NOFS);
        if (oh != NULL) {
                oh->ot_quota_trans = &oti->oti_quota_trans;
@@ -956,23 +1399,71 @@ static struct thandle *osd_trans_create(const struct lu_env *env,
                th->th_result = 0;
                th->th_tags = LCT_TX_HANDLE;
                oh->ot_credits = 0;
-               atomic_set(&th->th_refc, 1);
-               th->th_alloc_size = sizeof(*oh);
-               oti->oti_dev = osd_dt_dev(d);
-               INIT_LIST_HEAD(&oh->ot_dcb_list);
+               INIT_LIST_HEAD(&oh->ot_commit_dcb_list);
+               INIT_LIST_HEAD(&oh->ot_stop_dcb_list);
                osd_th_alloced(oh);
 
                memset(oti->oti_declare_ops, 0,
-                                       sizeof(oti->oti_declare_ops));
-               memset(oti->oti_declare_ops_rb, 0,
-                                       sizeof(oti->oti_declare_ops_rb));
+                      sizeof(oti->oti_declare_ops));
                memset(oti->oti_declare_ops_cred, 0,
-                                       sizeof(oti->oti_declare_ops_cred));
-               oti->oti_rollback = false;
+                      sizeof(oti->oti_declare_ops_cred));
+               memset(oti->oti_declare_ops_used, 0,
+                      sizeof(oti->oti_declare_ops_used));
+       } else {
+               sb_end_write(osd_sb(osd_dt_dev(d)));
+               th = ERR_PTR(-ENOMEM);
        }
        RETURN(th);
 }
 
+void osd_trans_dump_creds(const struct lu_env *env, struct thandle *th)
+{
+       struct osd_thread_info  *oti = osd_oti_get(env);
+       struct osd_thandle      *oh;
+
+       oh = container_of0(th, struct osd_thandle, ot_super);
+       LASSERT(oh != NULL);
+
+       CWARN("  create: %u/%u/%u, destroy: %u/%u/%u\n",
+             oti->oti_declare_ops[OSD_OT_CREATE],
+             oti->oti_declare_ops_cred[OSD_OT_CREATE],
+             oti->oti_declare_ops_used[OSD_OT_CREATE],
+             oti->oti_declare_ops[OSD_OT_DESTROY],
+             oti->oti_declare_ops_cred[OSD_OT_DESTROY],
+             oti->oti_declare_ops_used[OSD_OT_DESTROY]);
+       CWARN("  attr_set: %u/%u/%u, xattr_set: %u/%u/%u\n",
+             oti->oti_declare_ops[OSD_OT_ATTR_SET],
+             oti->oti_declare_ops_cred[OSD_OT_ATTR_SET],
+             oti->oti_declare_ops_used[OSD_OT_ATTR_SET],
+             oti->oti_declare_ops[OSD_OT_XATTR_SET],
+             oti->oti_declare_ops_cred[OSD_OT_XATTR_SET],
+             oti->oti_declare_ops_used[OSD_OT_XATTR_SET]);
+       CWARN("  write: %u/%u/%u, punch: %u/%u/%u, quota %u/%u/%u\n",
+             oti->oti_declare_ops[OSD_OT_WRITE],
+             oti->oti_declare_ops_cred[OSD_OT_WRITE],
+             oti->oti_declare_ops_used[OSD_OT_WRITE],
+             oti->oti_declare_ops[OSD_OT_PUNCH],
+             oti->oti_declare_ops_cred[OSD_OT_PUNCH],
+             oti->oti_declare_ops_used[OSD_OT_PUNCH],
+             oti->oti_declare_ops[OSD_OT_QUOTA],
+             oti->oti_declare_ops_cred[OSD_OT_QUOTA],
+             oti->oti_declare_ops_used[OSD_OT_QUOTA]);
+       CWARN("  insert: %u/%u/%u, delete: %u/%u/%u\n",
+             oti->oti_declare_ops[OSD_OT_INSERT],
+             oti->oti_declare_ops_cred[OSD_OT_INSERT],
+             oti->oti_declare_ops_used[OSD_OT_INSERT],
+             oti->oti_declare_ops[OSD_OT_DELETE],
+             oti->oti_declare_ops_cred[OSD_OT_DELETE],
+             oti->oti_declare_ops_used[OSD_OT_DELETE]);
+       CWARN("  ref_add: %u/%u/%u, ref_del: %u/%u/%u\n",
+             oti->oti_declare_ops[OSD_OT_REF_ADD],
+             oti->oti_declare_ops_cred[OSD_OT_REF_ADD],
+             oti->oti_declare_ops_used[OSD_OT_REF_ADD],
+             oti->oti_declare_ops[OSD_OT_REF_DEL],
+             oti->oti_declare_ops_cred[OSD_OT_REF_DEL],
+             oti->oti_declare_ops_used[OSD_OT_REF_DEL]);
+}
+
 /*
  * Concurrency: shouldn't matter.
  */
@@ -1001,41 +1492,13 @@ static int osd_trans_start(const struct lu_env *env, struct dt_device *d,
                static unsigned long last_printed;
                static int last_credits;
 
-               CWARN("%.16s: too many transaction credits (%d > %d)\n",
-                     LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name,
-                     oh->ot_credits,
-                     osd_journal(dev)->j_max_transaction_buffers);
-               CWARN("  create: %u/%u, destroy: %u/%u\n",
-                     oti->oti_declare_ops[OSD_OT_CREATE],
-                     oti->oti_declare_ops_cred[OSD_OT_CREATE],
-                     oti->oti_declare_ops[OSD_OT_DESTROY],
-                     oti->oti_declare_ops_cred[OSD_OT_DESTROY]);
-               CWARN("  attr_set: %u/%u, xattr_set: %u/%u\n",
-                     oti->oti_declare_ops[OSD_OT_ATTR_SET],
-                     oti->oti_declare_ops_cred[OSD_OT_ATTR_SET],
-                     oti->oti_declare_ops[OSD_OT_XATTR_SET],
-                     oti->oti_declare_ops_cred[OSD_OT_XATTR_SET]);
-               CWARN("  write: %u/%u, punch: %u/%u, quota %u/%u\n",
-                     oti->oti_declare_ops[OSD_OT_WRITE],
-                     oti->oti_declare_ops_cred[OSD_OT_WRITE],
-                     oti->oti_declare_ops[OSD_OT_PUNCH],
-                     oti->oti_declare_ops_cred[OSD_OT_PUNCH],
-                     oti->oti_declare_ops[OSD_OT_QUOTA],
-                     oti->oti_declare_ops_cred[OSD_OT_QUOTA]);
-               CWARN("  insert: %u/%u, delete: %u/%u\n",
-                     oti->oti_declare_ops[OSD_OT_INSERT],
-                     oti->oti_declare_ops_cred[OSD_OT_INSERT],
-                     oti->oti_declare_ops[OSD_OT_DELETE],
-                     oti->oti_declare_ops_cred[OSD_OT_DELETE]);
-               CWARN("  ref_add: %u/%u, ref_del: %u/%u\n",
-                     oti->oti_declare_ops[OSD_OT_REF_ADD],
-                     oti->oti_declare_ops_cred[OSD_OT_REF_ADD],
-                     oti->oti_declare_ops[OSD_OT_REF_DEL],
-                     oti->oti_declare_ops_cred[OSD_OT_REF_DEL]);
-
+               /* don't make noise on a tiny testing systems
+                * actual credits misuse will be caught anyway */
                if (last_credits != oh->ot_credits &&
                    time_after(jiffies, last_printed +
-                              msecs_to_jiffies(60 * MSEC_PER_SEC))) {
+                              msecs_to_jiffies(60 * MSEC_PER_SEC)) &&
+                   osd_transaction_size(dev) > 512) {
+                       osd_trans_dump_creds(env, th);
                        libcfs_debug_dumpstack(NULL);
                        last_credits = oh->ot_credits;
                        last_printed = jiffies;
@@ -1095,26 +1558,48 @@ static int osd_seq_exists(const struct lu_env *env,
        RETURN(ss->ss_node_id == range->lsr_index);
 }
 
+static void osd_trans_stop_cb(struct osd_thandle *oth, int result)
+{
+       struct dt_txn_commit_cb *dcb;
+       struct dt_txn_commit_cb *tmp;
+
+       /* call per-transaction stop callbacks if any */
+       list_for_each_entry_safe(dcb, tmp, &oth->ot_stop_dcb_list,
+                                dcb_linkage) {
+               LASSERTF(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC,
+                        "commit callback entry: magic=%x name='%s'\n",
+                        dcb->dcb_magic, dcb->dcb_name);
+               list_del_init(&dcb->dcb_linkage);
+               dcb->dcb_func(NULL, &oth->ot_super, dcb, result);
+       }
+}
+
 /*
  * Concurrency: shouldn't matter.
  */
 static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
                          struct thandle *th)
 {
-       int                     rc = 0;
+       int                     rc = 0, remove_agents = 0;
        struct osd_thandle     *oh;
        struct osd_thread_info *oti = osd_oti_get(env);
        struct osd_iobuf       *iobuf = &oti->oti_iobuf;
-       struct qsd_instance    *qsd = oti->oti_dev->od_quota_slave;
+       struct osd_device      *osd = osd_dt_dev(th->th_dev);
+       struct qsd_instance    *qsd = osd->od_quota_slave;
        struct lquota_trans    *qtrans;
        ENTRY;
 
        oh = container_of0(th, struct osd_thandle, ot_super);
 
+       /* reset OI cache for safety */
+       oti->oti_ins_cache_used = 0;
+
+       remove_agents = oh->ot_remove_agents;
+
        qtrans = oh->ot_quota_trans;
        oh->ot_quota_trans = NULL;
 
-        if (oh->ot_handle != NULL) {
+       if (oh->ot_handle != NULL) {
                 handle_t *hdl = oh->ot_handle;
 
                 /*
@@ -1127,21 +1612,25 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
 
                 LASSERT(oti->oti_txns == 1);
                 oti->oti_txns--;
+
                 rc = dt_txn_hook_stop(env, th);
                 if (rc != 0)
-                        CERROR("Failure in transaction hook: %d\n", rc);
+                       CERROR("%s: failed in transaction hook: rc = %d\n",
+                              osd_name(osd), rc);
 
+               osd_trans_stop_cb(oh, rc);
                /* hook functions might modify th_sync */
                hdl->h_sync = th->th_sync;
 
-                oh->ot_handle = NULL;
-                OSD_CHECK_SLOW_TH(oh, oti->oti_dev,
-                                  rc = ldiskfs_journal_stop(hdl));
-                if (rc != 0)
-                        CERROR("Failure to stop transaction: %d\n", rc);
-        } else {
-               thandle_put(&oh->ot_super);
-        }
+               oh->ot_handle = NULL;
+               OSD_CHECK_SLOW_TH(oh, osd, rc = ldiskfs_journal_stop(hdl));
+               if (rc != 0)
+                       CERROR("%s: failed to stop transaction: rc = %d\n",
+                              osd_name(osd), rc);
+       } else {
+               osd_trans_stop_cb(oh, th->th_result);
+               OBD_FREE_PTR(oh);
+       }
 
        /* inform the quota slave device that the transaction is stopping */
        qsd_op_end(env, qsd, qtrans);
@@ -1157,10 +1646,15 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
         */
        wait_event(iobuf->dr_wait,
                       atomic_read(&iobuf->dr_numreqs) == 0);
-       osd_fini_iobuf(oti->oti_dev, iobuf);
+       osd_fini_iobuf(osd, iobuf);
        if (!rc)
                rc = iobuf->dr_error;
 
+       if (unlikely(remove_agents != 0))
+               osd_process_scheduled_agent_removals(env, osd);
+
+       sb_end_write(osd_sb(osd));
+
        RETURN(rc);
 }
 
@@ -1171,7 +1665,10 @@ static int osd_trans_cb_add(struct thandle *th, struct dt_txn_commit_cb *dcb)
 
        LASSERT(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC);
        LASSERT(&dcb->dcb_func != NULL);
-       list_add(&dcb->dcb_linkage, &oh->ot_dcb_list);
+       if (dcb->dcb_flags & DCB_TRANS_STOP)
+               list_add(&dcb->dcb_linkage, &oh->ot_stop_dcb_list);
+       else
+               list_add(&dcb->dcb_linkage, &oh->ot_commit_dcb_list);
 
        return 0;
 }
@@ -1223,6 +1720,12 @@ static void osd_object_delete(const struct lu_env *env, struct lu_object *l)
 static void osd_object_release(const struct lu_env *env,
                                struct lu_object *l)
 {
+       struct osd_object *o = osd_obj(l);
+       /* nobody should be releasing a non-destroyed object with nlink=0
+        * the API allows this, but ldiskfs doesn't like and then report
+        * this inode as deleted */
+       if (unlikely(!o->oo_destroyed && o->oo_inode && o->oo_inode->i_nlink == 0))
+               LBUG();
 }
 
 /*
@@ -1246,18 +1749,17 @@ static int osd_object_print(const struct lu_env *env, void *cookie,
                     d ? d->id_ops->id_name : "plain");
 }
 
-#define GRANT_FOR_LOCAL_OIDS 32 /* 128kB for last_rcvd, quota files, ... */
-
 /*
  * Concurrency: shouldn't matter.
  */
 int osd_statfs(const struct lu_env *env, struct dt_device *d,
                struct obd_statfs *sfs)
 {
-        struct osd_device  *osd = osd_dt_dev(d);
-        struct super_block *sb = osd_sb(osd);
-        struct kstatfs     *ksfs;
-        int result = 0;
+       struct osd_device       *osd = osd_dt_dev(d);
+       struct super_block      *sb = osd_sb(osd);
+       struct kstatfs          *ksfs;
+       __u64                    reserved;
+       int                      result = 0;
 
        if (unlikely(osd->od_mnt == NULL))
                return -EINPROGRESS;
@@ -1271,30 +1773,40 @@ int osd_statfs(const struct lu_env *env, struct dt_device *d,
                 ksfs = &osd_oti_get(env)->oti_ksfs;
         }
 
-       spin_lock(&osd->od_osfs_lock);
        result = sb->s_op->statfs(sb->s_root, ksfs);
-       if (likely(result == 0)) { /* N.B. statfs can't really fail */
-               statfs_pack(sfs, ksfs);
-               if (sb->s_flags & MS_RDONLY)
-                       sfs->os_state = OS_STATE_READONLY;
-       }
-
-       spin_unlock(&osd->od_osfs_lock);
+       if (result)
+               goto out;
+
+       statfs_pack(sfs, ksfs);
+       if (unlikely(sb->s_flags & MS_RDONLY))
+               sfs->os_state = OS_STATE_READONLY;
+       if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
+                                        LDISKFS_FEATURE_INCOMPAT_EXTENTS))
+               sfs->os_maxbytes = sb->s_maxbytes;
+       else
+               sfs->os_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;
 
-       if (unlikely(env == NULL))
-                OBD_FREE_PTR(ksfs);
+       /*
+        * Reserve some space so to avoid fragmenting the filesystem too much.
+        * Fragmentation not only impacts performance, but can also increase
+        * metadata overhead significantly, causing grant calculation to be
+        * wrong.
+        *
+        * Reserve 0.78% of total space, at least 8MB for small filesystems.
+        */
+       CLASSERT(OSD_STATFS_RESERVED > LDISKFS_MAX_BLOCK_SIZE);
+       reserved = OSD_STATFS_RESERVED >> sb->s_blocksize_bits;
+       if (likely(sfs->os_blocks >= reserved << OSD_STATFS_RESERVED_SHIFT))
+               reserved = sfs->os_blocks >> OSD_STATFS_RESERVED_SHIFT;
 
-       /* Reserve a small amount of space for local objects like last_rcvd,
-        * llog, quota files, ... */
-       if (sfs->os_bavail <= GRANT_FOR_LOCAL_OIDS) {
-               sfs->os_bavail = 0;
-       } else {
-               sfs->os_bavail -= GRANT_FOR_LOCAL_OIDS;
-               /** Take out metadata overhead for indirect blocks */
-               sfs->os_bavail -= sfs->os_bavail >> (sb->s_blocksize_bits - 3);
-       }
+       sfs->os_blocks -= reserved;
+       sfs->os_bfree  -= min(reserved, sfs->os_bfree);
+       sfs->os_bavail -= min(reserved, sfs->os_bavail);
 
-        return result;
+out:
+       if (unlikely(env == NULL))
+               OBD_FREE_PTR(ksfs);
+       return result;
 }
 
 /**
@@ -1323,18 +1835,23 @@ static void osd_conf_get(const struct lu_env *env,
          */
         param->ddp_max_name_len = LDISKFS_NAME_LEN;
         param->ddp_max_nlink    = LDISKFS_LINK_MAX;
-       param->ddp_block_shift  = sb->s_blocksize_bits;
+       param->ddp_symlink_max  = sb->s_blocksize;
        param->ddp_mount_type     = LDD_MT_LDISKFS;
-       param->ddp_maxbytes       = sb->s_maxbytes;
-       /* Overhead estimate should be fairly accurate, so we really take a tiny
-        * error margin which also avoids fragmenting the filesystem too much */
-       param->ddp_grant_reserved = 2; /* end up to be 1.9% after conversion */
+       if (LDISKFS_HAS_INCOMPAT_FEATURE(sb, LDISKFS_FEATURE_INCOMPAT_EXTENTS))
+               param->ddp_maxbytes = sb->s_maxbytes;
+       else
+               param->ddp_maxbytes = LDISKFS_SB(sb)->s_bitmap_maxbytes;
        /* inode are statically allocated, so per-inode space consumption
         * is the space consumed by the directory entry */
        param->ddp_inodespace     = PER_OBJ_USAGE;
-       /* per-fragment overhead to be used by the client code */
-       param->ddp_grant_frag     = 6 * LDISKFS_BLOCK_SIZE(sb);
-        param->ddp_mntopts      = 0;
+       /* EXT_INIT_MAX_LEN is the theoretical maximum extent size  (32k blocks
+        * = 128MB) which is unlikely to be hit in real life. Report a smaller
+        * maximum length to not under count the actual number of extents
+        * needed for writing a file. */
+       param->ddp_max_extent_blks = EXT_INIT_MAX_LEN >> 2;
+       /* worst-case extent insertion metadata overhead */
+       param->ddp_extent_tax = 6 * LDISKFS_BLOCK_SIZE(sb);
+       param->ddp_mntopts      = 0;
         if (test_opt(sb, XATTR_USER))
                 param->ddp_mntopts |= MNTOPT_USERXATTR;
         if (test_opt(sb, POSIX_ACL))
@@ -1413,6 +1930,12 @@ static int osd_ro(const struct lu_env *env, struct dt_device *d)
 #ifdef HAVE_DEV_SET_RDONLY
        CERROR("*** setting %s read-only ***\n", osd_dt_dev(d)->od_svname);
 
+       if (sb->s_op->freeze_fs) {
+               rc = sb->s_op->freeze_fs(sb);
+               if (rc)
+                       goto out;
+       }
+
        if (jdev && (jdev != dev)) {
                CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
                       (long)jdev);
@@ -1420,28 +1943,17 @@ static int osd_ro(const struct lu_env *env, struct dt_device *d)
        }
        CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
        dev_set_rdonly(dev);
-#else
-       CERROR("%s: %lx CANNOT BE SET READONLY: rc = %d\n",
-              osd_dt_dev(d)->od_svname, (long)dev, rc);
-#endif
-       RETURN(rc);
-}
 
-/*
- * Concurrency: serialization provided by callers.
- */
-static int osd_init_capa_ctxt(const struct lu_env *env, struct dt_device *d,
-                              int mode, unsigned long timeout, __u32 alg,
-                              struct lustre_capa_key *keys)
-{
-        struct osd_device *dev = osd_dt_dev(d);
-        ENTRY;
+       if (sb->s_op->unfreeze_fs)
+               sb->s_op->unfreeze_fs(sb);
 
-        dev->od_fl_capa = mode;
-        dev->od_capa_timeout = timeout;
-        dev->od_capa_alg = alg;
-        dev->od_capa_keys = keys;
-        RETURN(0);
+out:
+#endif
+       if (rc)
+               CERROR("%s: %lx CANNOT BE SET READONLY: rc = %d\n",
+                      osd_dt_dev(d)->od_svname, (long)dev, rc);
+
+       RETURN(rc);
 }
 
 /**
@@ -1513,7 +2025,6 @@ static const struct dt_device_operations osd_dt_ops = {
         .dt_sync           = osd_sync,
         .dt_ro             = osd_ro,
         .dt_commit_async   = osd_commit_async,
-        .dt_init_capa_ctxt = osd_init_capa_ctxt,
 };
 
 static void osd_object_read_lock(const struct lu_env *env,
@@ -1585,108 +2096,6 @@ static int osd_object_write_locked(const struct lu_env *env,
         return obj->oo_owner == env;
 }
 
-static int capa_is_sane(const struct lu_env *env,
-                        struct osd_device *dev,
-                        struct lustre_capa *capa,
-                        struct lustre_capa_key *keys)
-{
-        struct osd_thread_info *oti = osd_oti_get(env);
-        struct lustre_capa *tcapa = &oti->oti_capa;
-        struct obd_capa *oc;
-        int i, rc = 0;
-        ENTRY;
-
-        oc = capa_lookup(dev->od_capa_hash, capa, 0);
-        if (oc) {
-                if (capa_is_expired(oc)) {
-                        DEBUG_CAPA(D_ERROR, capa, "expired");
-                        rc = -ESTALE;
-                }
-                capa_put(oc);
-                RETURN(rc);
-        }
-
-        if (capa_is_expired_sec(capa)) {
-                DEBUG_CAPA(D_ERROR, capa, "expired");
-                RETURN(-ESTALE);
-        }
-
-       spin_lock(&capa_lock);
-       for (i = 0; i < 2; i++) {
-               if (keys[i].lk_keyid == capa->lc_keyid) {
-                       oti->oti_capa_key = keys[i];
-                       break;
-               }
-       }
-       spin_unlock(&capa_lock);
-
-        if (i == 2) {
-                DEBUG_CAPA(D_ERROR, capa, "no matched capa key");
-                RETURN(-ESTALE);
-        }
-
-        rc = capa_hmac(tcapa->lc_hmac, capa, oti->oti_capa_key.lk_key);
-        if (rc)
-                RETURN(rc);
-
-        if (memcmp(tcapa->lc_hmac, capa->lc_hmac, sizeof(capa->lc_hmac))) {
-                DEBUG_CAPA(D_ERROR, capa, "HMAC mismatch");
-                RETURN(-EACCES);
-        }
-
-        oc = capa_add(dev->od_capa_hash, capa);
-        capa_put(oc);
-
-        RETURN(0);
-}
-
-int osd_object_auth(const struct lu_env *env, struct dt_object *dt,
-                   struct lustre_capa *capa, __u64 opc)
-{
-       const struct lu_fid *fid = lu_object_fid(&dt->do_lu);
-       struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);
-       struct lu_capainfo *lci;
-       int rc;
-
-       if (!osd->od_fl_capa)
-               return 0;
-
-       if (capa == BYPASS_CAPA)
-               return 0;
-
-       lci = lu_capainfo_get(env);
-       if (unlikely(lci == NULL))
-               return 0;
-
-       if (lci->lci_auth == LC_ID_NONE)
-               return 0;
-
-       if (capa == NULL) {
-               CERROR("%s: no capability provided for FID "DFID": rc = %d\n",
-                      osd_name(osd), PFID(fid), -EACCES);
-               return -EACCES;
-       }
-
-       if (!lu_fid_eq(fid, &capa->lc_fid)) {
-               DEBUG_CAPA(D_ERROR, capa, "fid "DFID" mismatch with",
-                          PFID(fid));
-               return -EACCES;
-       }
-
-       if (!capa_opc_supported(capa, opc)) {
-               DEBUG_CAPA(D_ERROR, capa, "opc "LPX64" not supported by", opc);
-               return -EACCES;
-       }
-
-       rc = capa_is_sane(env, osd, capa, osd->od_capa_keys);
-       if (rc != 0) {
-               DEBUG_CAPA(D_ERROR, capa, "insane: rc = %d", rc);
-               return -EACCES;
-       }
-
-       return 0;
-}
-
 static struct timespec *osd_inode_time(const struct lu_env *env,
                                       struct inode *inode, __u64 seconds)
 {
@@ -1699,7 +2108,6 @@ static struct timespec *osd_inode_time(const struct lu_env *env,
        return t;
 }
 
-
 static void osd_inode_getattr(const struct lu_env *env,
                              struct inode *inode, struct lu_attr *attr)
 {
@@ -1716,7 +2124,7 @@ static void osd_inode_getattr(const struct lu_env *env,
        attr->la_blocks  = inode->i_blocks;
        attr->la_uid     = i_uid_read(inode);
        attr->la_gid     = i_gid_read(inode);
-       attr->la_flags   = LDISKFS_I(inode)->i_flags;
+       attr->la_flags   = ll_inode_to_ext_flags(inode->i_flags);
        attr->la_nlink   = inode->i_nlink;
        attr->la_rdev    = inode->i_rdev;
        attr->la_blksize = 1 << inode->i_blkbits;
@@ -1725,21 +2133,24 @@ static void osd_inode_getattr(const struct lu_env *env,
 
 static int osd_attr_get(const struct lu_env *env,
                        struct dt_object *dt,
-                       struct lu_attr *attr,
-                       struct lustre_capa *capa)
+                       struct lu_attr *attr)
 {
        struct osd_object *obj = osd_dt_obj(dt);
 
-       LASSERT(dt_object_exists(dt));
+       if (unlikely(!dt_object_exists(dt)))
+               return -ENOENT;
+       if (unlikely(obj->oo_destroyed))
+               return -ENOENT;
+
        LASSERT(!dt_object_remote(dt));
        LINVRNT(osd_invariant(obj));
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_META_READ))
-               return -EACCES;
-
        spin_lock(&obj->oo_guard);
        osd_inode_getattr(env, obj->oo_inode, attr);
+       if (obj->oo_lma_flags & LUSTRE_ORPHAN_FL)
+               attr->la_flags |= LUSTRE_ORPHAN_FL;
        spin_unlock(&obj->oo_guard);
+
        return 0;
 }
 
@@ -1771,6 +2182,9 @@ static int osd_declare_attr_set(const struct lu_env *env,
        osd_trans_declare_op(env, oh, OSD_OT_ATTR_SET,
                             osd_dto_credits_noquota[DTO_ATTR_SET_BASE]);
 
+       osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET,
+                            osd_dto_credits_noquota[DTO_XATTR_SET]);
+
        if (attr == NULL || obj->oo_inode == NULL)
                RETURN(rc);
 
@@ -1899,23 +2313,19 @@ static int osd_inode_setattr(const struct lu_env *env,
        if (bits == 0)
                return 0;
 
-        if (bits & LA_ATIME)
-                inode->i_atime  = *osd_inode_time(env, inode, attr->la_atime);
-        if (bits & LA_CTIME)
-                inode->i_ctime  = *osd_inode_time(env, inode, attr->la_ctime);
-        if (bits & LA_MTIME)
-                inode->i_mtime  = *osd_inode_time(env, inode, attr->la_mtime);
-        if (bits & LA_SIZE) {
-                LDISKFS_I(inode)->i_disksize = attr->la_size;
-                i_size_write(inode, attr->la_size);
-        }
+       if (bits & LA_ATIME)
+               inode->i_atime  = *osd_inode_time(env, inode, attr->la_atime);
+       if (bits & LA_CTIME)
+               inode->i_ctime  = *osd_inode_time(env, inode, attr->la_ctime);
+       if (bits & LA_MTIME)
+               inode->i_mtime  = *osd_inode_time(env, inode, attr->la_mtime);
+       if (bits & LA_SIZE) {
+               LDISKFS_I(inode)->i_disksize = attr->la_size;
+               i_size_write(inode, attr->la_size);
+       }
 
-#if 0
-        /* OSD should not change "i_blocks" which is used by quota.
-         * "i_blocks" should be changed by ldiskfs only. */
-        if (bits & LA_BLOCKS)
-                inode->i_blocks = attr->la_blocks;
-#endif
+       /* OSD should not change "i_blocks" which is used by quota.
+        * "i_blocks" should be changed by ldiskfs only. */
        if (bits & LA_MODE)
                inode->i_mode = (inode->i_mode & S_IFMT) |
                                (attr->la_mode & ~S_IFMT);
@@ -1928,12 +2338,12 @@ static int osd_inode_setattr(const struct lu_env *env,
        if (bits & LA_RDEV)
                inode->i_rdev = attr->la_rdev;
 
-        if (bits & LA_FLAGS) {
-                /* always keep S_NOCMTIME */
-                inode->i_flags = ll_ext_to_inode_flags(attr->la_flags) |
-                                 S_NOCMTIME;
-        }
-        return 0;
+       if (bits & LA_FLAGS) {
+               /* always keep S_NOCMTIME */
+               inode->i_flags = ll_ext_to_inode_flags(attr->la_flags) |
+                                S_NOCMTIME;
+       }
+       return 0;
 }
 
 static int osd_quota_transfer(struct inode *inode, const struct lu_attr *attr)
@@ -1966,21 +2376,19 @@ static int osd_quota_transfer(struct inode *inode, const struct lu_attr *attr)
 static int osd_attr_set(const struct lu_env *env,
                        struct dt_object *dt,
                        const struct lu_attr *attr,
-                       struct thandle *handle,
-                       struct lustre_capa *capa)
+                       struct thandle *handle)
 {
        struct osd_object *obj = osd_dt_obj(dt);
        struct inode      *inode;
        int rc;
 
+       if (!dt_object_exists(dt))
+               return -ENOENT;
+
        LASSERT(handle != NULL);
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(osd_invariant(obj));
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_META_WRITE))
-               return -EACCES;
-
        osd_trans_exec_op(env, handle, OSD_OT_ATTR_SET);
 
        if (OBD_FAIL_CHECK(OBD_FAIL_OSD_FID_MAPPING)) {
@@ -2017,9 +2425,43 @@ static int osd_attr_set(const struct lu_env *env,
        spin_lock(&obj->oo_guard);
        rc = osd_inode_setattr(env, inode, attr);
        spin_unlock(&obj->oo_guard);
+       if (rc != 0)
+               GOTO(out, rc);
+
+       ll_dirty_inode(inode, I_DIRTY_DATASYNC);
+
+       if (!(attr->la_valid & LA_FLAGS))
+               GOTO(out, rc);
+
+       /* Let's check if there are extra flags need to be set into LMA */
+       if (attr->la_flags & LUSTRE_LMA_FL_MASKS) {
+               struct osd_thread_info *info = osd_oti_get(env);
+               struct lustre_mdt_attrs *lma = &info->oti_mdt_attrs;
+
+               rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
+               if (rc != 0)
+                       GOTO(out, rc);
+
+               lma->lma_incompat |=
+                       lustre_to_lma_flags(attr->la_flags);
+               lustre_lma_swab(lma);
+               rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA,
+                                    lma, sizeof(*lma), XATTR_REPLACE);
+               if (rc != 0) {
+                       struct osd_device *osd = osd_obj2dev(obj);
+
+                       CWARN("%s: set "DFID" lma flags %u failed: rc = %d\n",
+                             osd_name(osd), PFID(lu_object_fid(&dt->do_lu)),
+                             lma->lma_incompat, rc);
+               } else {
+                       obj->oo_lma_flags =
+                               attr->la_flags & LUSTRE_LMA_FL_MASKS;
+               }
+               osd_trans_exec_check(env, handle, OSD_OT_XATTR_SET);
+       }
+out:
+       osd_trans_exec_check(env, handle, OSD_OT_ATTR_SET);
 
-        if (!rc)
-               ll_dirty_inode(inode, I_DIRTY_DATASYNC);
         return rc;
 }
 
@@ -2053,22 +2495,22 @@ static int osd_mkfile(struct osd_thread_info *info, struct osd_object *obj,
         oth = container_of(th, struct osd_thandle, ot_super);
         LASSERT(oth->ot_handle->h_transaction != NULL);
 
-        if (hint && hint->dah_parent)
-                parent = hint->dah_parent;
+       if (hint != NULL && hint->dah_parent != NULL &&
+           !dt_object_remote(hint->dah_parent))
+               parent = hint->dah_parent;
 
         inode = ldiskfs_create_inode(oth->ot_handle,
                                      parent ? osd_dt_obj(parent)->oo_inode :
                                               osd_sb(osd)->s_root->d_inode,
                                      mode);
         if (!IS_ERR(inode)) {
-                /* Do not update file c/mtime in ldiskfs.
-                 * NB: don't need any lock because no contention at this
-                 * early stage */
-                inode->i_flags |= S_NOCMTIME;
+               /* Do not update file c/mtime in ldiskfs. */
+               inode->i_flags |= S_NOCMTIME;
 
                /* For new created object, it must be consistent,
                 * and it is unnecessary to scrub against it. */
                ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_NOSCRUB);
+
                 obj->oo_inode = inode;
                 result = 0;
         } else {
@@ -2235,6 +2677,12 @@ static void osd_ah_init(const struct lu_env *env, struct dt_allocation_hint *ah,
 
         ah->dah_parent = parent;
         ah->dah_mode = child_mode;
+
+       if (parent != NULL && !dt_object_remote(parent)) {
+               /* will help to find FID->ino at dt_insert("..") */
+               struct osd_object *pobj = osd_dt_obj(parent);
+               osd_idc_find_and_init(env, osd_obj2dev(pobj), pobj);
+       }
 }
 
 static void osd_attr_init(struct osd_thread_info *info, struct osd_object *obj,
@@ -2259,20 +2707,20 @@ static void osd_attr_init(struct osd_thread_info *info, struct osd_object *obj,
        if (result)
                return;
 
-        if (attr->la_valid != 0) {
-                result = osd_inode_setattr(info->oti_env, inode, attr);
-                /*
-                 * The osd_inode_setattr() should always succeed here.  The
-                 * only error that could be returned is EDQUOT when we are
-                 * trying to change the UID or GID of the inode. However, this
-                 * should not happen since quota enforcement is no longer
-                 * enabled on ldiskfs (lquota takes care of it).
-                 */
+       if (attr->la_valid != 0) {
+               result = osd_inode_setattr(info->oti_env, inode, attr);
+               /*
+                * The osd_inode_setattr() should always succeed here.  The
+                * only error that could be returned is EDQUOT when we are
+                * trying to change the UID or GID of the inode. However, this
+                * should not happen since quota enforcement is no longer
+                * enabled on ldiskfs (lquota takes care of it).
+                */
                LASSERTF(result == 0, "%d\n", result);
                ll_dirty_inode(inode, I_DIRTY_DATASYNC);
-        }
+       }
 
-        attr->la_valid = valid;
+       attr->la_valid = valid;
 }
 
 /**
@@ -2289,23 +2737,32 @@ static int __osd_object_create(struct osd_thread_info *info,
        int     result;
        __u32   umask;
 
+       osd_trans_exec_op(info->oti_env, th, OSD_OT_CREATE);
+
        /* we drop umask so that permissions we pass are not affected */
        umask = current->fs->umask;
        current->fs->umask = 0;
 
        result = osd_create_type_f(dof->dof_type)(info, obj, attr, hint, dof,
                                                  th);
-        if (result == 0) {
+       if (likely(obj->oo_inode != NULL)) {
+               LASSERT(obj->oo_inode->i_state & I_NEW);
+
+               /* Unlock the inode before attr initialization to avoid
+                * unnecessary dqget operations. LU-6378 */
+               unlock_new_inode(obj->oo_inode);
+       }
+
+       if (likely(result == 0)) {
                osd_attr_init(info, obj, attr, dof);
                osd_object_init0(obj);
-               /* bz 24037 */
-               if (obj->oo_inode && (obj->oo_inode->i_state & I_NEW))
-                       unlock_new_inode(obj->oo_inode);
-        }
+       }
 
        /* restore previous umask value */
        current->fs->umask = umask;
 
+       osd_trans_exec_check(info->oti_env, th, OSD_OT_CREATE);
+
        return result;
 }
 
@@ -2321,14 +2778,20 @@ static int __osd_oi_insert(const struct lu_env *env, struct osd_object *obj,
        struct osd_inode_id    *id   = &info->oti_id;
        struct osd_device      *osd  = osd_obj2dev(obj);
        struct osd_thandle     *oh;
+       int                     rc;
 
        LASSERT(obj->oo_inode != NULL);
 
        oh = container_of0(th, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle);
+       osd_trans_exec_op(env, th, OSD_OT_INSERT);
 
        osd_id_gen(id, obj->oo_inode->i_ino, obj->oo_inode->i_generation);
-       return osd_oi_insert(info, osd, fid, id, oh->ot_handle, OI_CHECK_FLD);
+       rc = osd_oi_insert(info, osd, fid, id, oh->ot_handle,
+                          OI_CHECK_FLD, NULL);
+       osd_trans_exec_check(env, th, OSD_OT_INSERT);
+
+       return rc;
 }
 
 int osd_fld_lookup(const struct lu_env *env, struct osd_device *osd,
@@ -2376,24 +2839,18 @@ static int osd_declare_object_create(const struct lu_env *env,
        oh = container_of0(handle, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle == NULL);
 
+       /* EA object consumes more credits than regular object: osd_mk_index
+        * vs. osd_mkreg: osd_mk_index will create 2 blocks for root_node and
+        * leaf_node, could involves the block, block bitmap, groups, GDT
+        * change for each block, so add 4 * 2 credits in that case. */
        osd_trans_declare_op(env, oh, OSD_OT_CREATE,
-                            osd_dto_credits_noquota[DTO_OBJECT_CREATE]);
+                            osd_dto_credits_noquota[DTO_OBJECT_CREATE] +
+                            (dof->dof_type == DFT_INDEX) ? 4 * 2 : 0);
        /* Reuse idle OI block may cause additional one OI block
         * to be changed. */
        osd_trans_declare_op(env, oh, OSD_OT_INSERT,
                             osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1);
 
-       /* If this is directory, then we expect . and .. to be inserted as
-        * well. The one directory block always needs to be created for the
-        * directory, so we could use DTO_WRITE_BASE here (GDT, block bitmap,
-        * block), there is no danger of needing a tree for the first block.
-        */
-       if (attr && S_ISDIR(attr->la_mode)) {
-               osd_trans_declare_op(env, oh, OSD_OT_INSERT,
-                                    osd_dto_credits_noquota[DTO_WRITE_BASE]);
-               osd_trans_declare_op(env, oh, OSD_OT_INSERT, 0);
-       }
-
        if (!attr)
                RETURN(0);
 
@@ -2402,6 +2859,10 @@ static int osd_declare_object_create(const struct lu_env *env,
        if (rc != 0)
                RETURN(rc);
 
+       /* will help to find FID->ino mapping at dt_insert() */
+       rc = osd_idc_find_and_init(env, osd_obj2dev(osd_dt_obj(dt)),
+                                  osd_dt_obj(dt));
+
        RETURN(rc);
 }
 
@@ -2416,8 +2877,10 @@ static int osd_object_create(const struct lu_env *env, struct dt_object *dt,
        int result;
        ENTRY;
 
+       if (dt_object_exists(dt))
+               return -EEXIST;
+
        LINVRNT(osd_invariant(obj));
-       LASSERT(!dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(osd_write_locked(env, obj));
        LASSERT(th != NULL);
@@ -2427,18 +2890,17 @@ static int osd_object_create(const struct lu_env *env, struct dt_object *dt,
                 * 'tune2fs -O quota' will take care of creating them */
                RETURN(-EPERM);
 
-       osd_trans_exec_op(env, th, OSD_OT_CREATE);
-       osd_trans_declare_rb(env, th, OSD_OT_REF_ADD);
-
-        result = __osd_object_create(info, obj, attr, hint, dof, th);
-        if (result == 0)
-                result = __osd_oi_insert(env, obj, fid, th);
-
+       result = __osd_object_create(info, obj, attr, hint, dof, th);
+       if (result == 0) {
+               result = __osd_oi_insert(env, obj, fid, th);
+               if (obj->oo_dt.do_body_ops == &osd_body_ops_new)
+                       obj->oo_dt.do_body_ops = &osd_body_ops;
+       }
        LASSERT(ergo(result == 0,
-                    dt_object_exists(dt) && !dt_object_remote(dt)));
+               dt_object_exists(dt) && !dt_object_remote(dt)));
 
-        LASSERT(osd_invariant(obj));
-        RETURN(result);
+       LASSERT(osd_invariant(obj));
+       RETURN(result);
 }
 
 /**
@@ -2456,9 +2918,11 @@ static int osd_declare_object_destroy(const struct lu_env *env,
        int                 rc;
        ENTRY;
 
+       if (inode == NULL)
+               RETURN(-ENOENT);
+
        oh = container_of0(th, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle == NULL);
-       LASSERT(inode);
 
        osd_trans_declare_op(env, oh, OSD_OT_DESTROY,
                             osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
@@ -2474,6 +2938,13 @@ static int osd_declare_object_destroy(const struct lu_env *env,
        /* data to be truncated */
        rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
                                   0, oh, obj, true, NULL, false);
+       if (rc)
+               RETURN(rc);
+
+       /* will help to find FID->ino when this object is being
+        * added to PENDING/ */
+       rc = osd_idc_find_and_init(env, osd_obj2dev(obj), obj);
+
        RETURN(rc);
 }
 
@@ -2515,16 +2986,19 @@ static int osd_object_destroy(const struct lu_env *env,
 
        osd_trans_exec_op(env, th, OSD_OT_DESTROY);
 
+       ldiskfs_set_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);
        result = osd_oi_delete(osd_oti_get(env), osd, fid, oh->ot_handle,
                               OI_CHECK_FLD);
 
-        /* XXX: add to ext3 orphan list */
-        /* rc = ext3_orphan_add(handle_t *handle, struct inode *inode) */
+       osd_trans_exec_check(env, th, OSD_OT_DESTROY);
+       /* XXX: add to ext3 orphan list */
+       /* rc = ext3_orphan_add(handle_t *handle, struct inode *inode) */
 
-        /* not needed in the cache anymore */
-        set_bit(LU_OBJECT_HEARD_BANSHEE, &dt->do_lu.lo_header->loh_flags);
+       /* not needed in the cache anymore */
+       set_bit(LU_OBJECT_HEARD_BANSHEE, &dt->do_lu.lo_header->loh_flags);
+       obj->oo_destroyed = 1;
 
-        RETURN(0);
+       RETURN(0);
 }
 
 /**
@@ -2547,6 +3021,9 @@ int osd_ea_fid_set(struct osd_thread_info *info, struct inode *inode,
        if (OBD_FAIL_CHECK(OBD_FAIL_FID_INLMA))
                RETURN(0);
 
+       if (OBD_FAIL_CHECK(OBD_FAIL_OSD_OST_EA_FID_SET))
+               rc = -ENOMEM;
+
        lustre_lma_init(lma, fid, compat, incompat);
        lustre_lma_swab(lma);
 
@@ -2634,14 +3111,32 @@ static int osd_add_dot_dotdot_internal(struct osd_thread_info *info,
 {
        struct ldiskfs_dentry_param *dot_ldp;
        struct ldiskfs_dentry_param *dot_dot_ldp;
+       __u32 saved_nlink = dir->i_nlink;
+       int rc;
 
        dot_dot_ldp = (struct ldiskfs_dentry_param *)info->oti_ldp2;
        osd_get_ldiskfs_dirent_param(dot_dot_ldp, dot_dot_fid);
 
        dot_ldp = (struct ldiskfs_dentry_param *)info->oti_ldp;
        dot_ldp->edp_magic = 0;
-       return ldiskfs_add_dot_dotdot(oth->ot_handle, parent_dir,
-                                       dir, dot_ldp, dot_dot_ldp);
+
+       rc = ldiskfs_add_dot_dotdot(oth->ot_handle, parent_dir,
+                                   dir, dot_ldp, dot_dot_ldp);
+       /* The ldiskfs_add_dot_dotdot() may dir->i_nlink as 2, then
+        * the subseqent ref_add() will increase the dir->i_nlink
+        * as 3. That is incorrect for new created directory.
+        *
+        * It looks like hack, because we want to make the OSD API
+        * to be order-independent for new created directory object
+        * between dt_insert(..) and ref_add() operations.
+        *
+        * Here, we only restore the in-RAM dir-inode's nlink attr,
+        * becuase if the nlink attr is not 2, then there will be
+        * ref_add() called following the dt_insert(..), such call
+        * will make both the in-RAM and on-disk dir-inode's nlink
+        * attr to be set as 2. LU-7447 */
+       set_nlink(dir, saved_nlink);
+       return rc;
 }
 
 /**
@@ -2671,6 +3166,9 @@ static struct inode *osd_create_local_agent_inode(const struct lu_env *env,
                RETURN(local);
        }
 
+       ldiskfs_set_inode_state(local, LDISKFS_STATE_LUSTRE_NOSCRUB);
+       unlock_new_inode(local);
+
        /* Set special LMA flag for local agent inode */
        rc = osd_ea_fid_set(info, local, fid, 0, LMAI_AGENT);
        if (rc != 0) {
@@ -2695,33 +3193,86 @@ static struct inode *osd_create_local_agent_inode(const struct lu_env *env,
 }
 
 /**
- * Delete local agent inode for remote entry
+ * when direntry is deleted, we have to take care of possible agent inode
+ * referenced by that. unfortunately we can't do this at that point:
+ * iget() within a running transaction leads to deadlock and we better do
+ * not call that every delete declaration to save performance. so we put
+ * a potention agent inode on a list and process that once the transaction
+ * is over. Notice it's not any worse in terms of real orphans as regular
+ * object destroy doesn't put inodes on the on-disk orphan list. this should
+ * be addressed separately
  */
-static int osd_delete_local_agent_inode(const struct lu_env *env,
-                                       struct osd_device *osd,
-                                       const struct lu_fid *fid,
-                                       __u32 ino, struct osd_thandle *oh)
+static int osd_schedule_agent_inode_removal(const struct lu_env *env,
+                                           struct osd_thandle *oh,
+                                           __u32 ino)
 {
-       struct osd_thread_info  *oti = osd_oti_get(env);
-       struct osd_inode_id     *id = &oti->oti_id;
-       struct inode            *inode;
-       ENTRY;
+       struct osd_device      *osd = osd_dt_dev(oh->ot_super.th_dev);
+       struct osd_obj_orphan *oor;
 
-       id->oii_ino = le32_to_cpu(ino);
-       id->oii_gen = OSD_OII_NOGEN;
-       inode = osd_iget(oti, osd, id);
-       if (IS_ERR(inode)) {
-               CERROR("%s: iget error "DFID" id %u:%u\n", osd_name(osd),
-                      PFID(fid), id->oii_ino, id->oii_gen);
-               RETURN(PTR_ERR(inode));
+       OBD_ALLOC_PTR(oor);
+       if (oor == NULL)
+               return -ENOMEM;
+
+       oor->oor_ino = ino;
+       oor->oor_env = (struct lu_env *)env;
+       spin_lock(&osd->od_osfs_lock);
+       list_add(&oor->oor_list, &osd->od_orphan_list);
+       spin_unlock(&osd->od_osfs_lock);
+
+       oh->ot_remove_agents = 1;
+
+       return 0;
+
+}
+
+static int osd_process_scheduled_agent_removals(const struct lu_env *env,
+                                               struct osd_device *osd)
+{
+       struct osd_thread_info *info = osd_oti_get(env);
+       struct osd_obj_orphan *oor, *tmp;
+       struct osd_inode_id id;
+       struct list_head list;
+       struct inode *inode;
+       struct lu_fid fid;
+       handle_t *jh;
+       __u32 ino;
+
+       INIT_LIST_HEAD(&list);
+
+       spin_lock(&osd->od_osfs_lock);
+       list_for_each_entry_safe(oor, tmp, &osd->od_orphan_list, oor_list) {
+               if (oor->oor_env == env) {
+                       list_del(&oor->oor_list);
+                       list_add(&oor->oor_list, &list);
+               }
        }
+       spin_unlock(&osd->od_osfs_lock);
 
-       clear_nlink(inode);
-       mark_inode_dirty(inode);
-       CDEBUG(D_INODE, "%s: delete remote inode "DFID" %lu\n",
-               osd_name(osd), PFID(fid), inode->i_ino);
-       iput(inode);
-       RETURN(0);
+       list_for_each_entry_safe(oor, tmp, &list, oor_list) {
+
+               ino = oor->oor_ino;
+
+               list_del(&oor->oor_list);
+               OBD_FREE_PTR(oor);
+
+               osd_id_gen(&id, ino, OSD_OII_NOGEN);
+               inode = osd_iget_fid(info, osd, &id, &fid);
+               if (IS_ERR(inode))
+                       continue;
+
+               if (!osd_remote_fid(env, osd, &fid)) {
+                       iput(inode);
+                       continue;
+               }
+
+               jh = osd_journal_start_sb(osd_sb(osd), LDISKFS_HT_MISC, 1);
+               clear_nlink(inode);
+               mark_inode_dirty(inode);
+               ldiskfs_journal_stop(jh);
+               iput(inode);
+       }
+
+       return 0;
 }
 
 /**
@@ -2741,12 +3292,14 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
        const struct lu_fid     *fid    = lu_object_fid(&dt->do_lu);
        struct osd_object       *obj    = osd_dt_obj(dt);
        struct osd_thread_info  *info   = osd_oti_get(env);
-       int                      result;
+       int                      result, on_ost = 0;
 
        ENTRY;
 
+       if (dt_object_exists(dt))
+               RETURN(-EEXIST);
+
        LASSERT(osd_invariant(obj));
-       LASSERT(!dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(osd_write_locked(env, obj));
        LASSERT(th != NULL);
@@ -2756,19 +3309,41 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
                 * 'tune2fs -O quota' will take care of creating them */
                RETURN(-EPERM);
 
-       osd_trans_exec_op(env, th, OSD_OT_CREATE);
-       osd_trans_declare_rb(env, th, OSD_OT_REF_ADD);
-
        result = __osd_object_create(info, obj, attr, hint, dof, th);
-       if (result == 0)
-               result = osd_ea_fid_set(info, obj->oo_inode, fid,
-                               fid_is_on_ost(info, osd_obj2dev(obj),
-                                             fid, OI_CHECK_FLD) ?
-                               LMAC_FID_ON_OST : 0, 0);
+       if (result == 0) {
+               if (fid_is_idif(fid) &&
+                   !osd_dev(dt->do_lu.lo_dev)->od_index_in_idif) {
+                       struct lu_fid *tfid = &info->oti_fid;
+                       struct ost_id *oi   = &info->oti_ostid;
+
+                       fid_to_ostid(fid, oi);
+                       ostid_to_fid(tfid, oi, 0);
+                       on_ost = 1;
+                       result = osd_ea_fid_set(info, obj->oo_inode, tfid,
+                                               LMAC_FID_ON_OST, 0);
+               } else {
+                       on_ost = fid_is_on_ost(info, osd_obj2dev(obj),
+                                              fid, OI_CHECK_FLD);
+                       result = osd_ea_fid_set(info, obj->oo_inode, fid,
+                                               on_ost ? LMAC_FID_ON_OST : 0,
+                                               0);
+               }
+               if (obj->oo_dt.do_body_ops == &osd_body_ops_new)
+                       obj->oo_dt.do_body_ops = &osd_body_ops;
+       }
 
        if (result == 0)
                result = __osd_oi_insert(env, obj, fid, th);
 
+       /* a small optimization - dt_insert() isn't usually applied
+        * to OST objects, so we don't need to cache OI mapping for
+        * OST objects */
+       if (result == 0 && on_ost == 0) {
+               struct osd_device *osd = osd_dev(dt->do_lu.lo_dev);
+               result = osd_idc_find_and_init(env, osd, obj);
+               LASSERT(result == 0);
+       }
+
        LASSERT(ergo(result == 0,
                     dt_object_exists(dt) && !dt_object_remote(dt)));
         LINVRNT(osd_invariant(obj));
@@ -2804,8 +3379,10 @@ static int osd_object_ref_add(const struct lu_env *env,
        struct osd_thandle *oh;
        int                 rc = 0;
 
+       if (!dt_object_exists(dt) || obj->oo_destroyed)
+               return -ENOENT;
+
        LINVRNT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(osd_write_locked(env, obj));
        LASSERT(th != NULL);
@@ -2842,6 +3419,8 @@ static int osd_object_ref_add(const struct lu_env *env,
        ll_dirty_inode(inode, I_DIRTY_DATASYNC);
        LINVRNT(osd_invariant(obj));
 
+       osd_trans_exec_check(env, th, OSD_OT_REF_ADD);
+
        return rc;
 }
 
@@ -2851,7 +3430,9 @@ static int osd_declare_object_ref_del(const struct lu_env *env,
 {
        struct osd_thandle *oh;
 
-       LASSERT(dt_object_exists(dt));
+       if (!dt_object_exists(dt))
+               return -ENOENT;
+
        LASSERT(!dt_object_remote(dt));
        LASSERT(handle != NULL);
 
@@ -2875,8 +3456,10 @@ static int osd_object_ref_del(const struct lu_env *env, struct dt_object *dt,
        struct osd_device       *osd = osd_dev(dt->do_lu.lo_dev);
        struct osd_thandle      *oh;
 
+       if (!dt_object_exists(dt))
+               return -ENOENT;
+
        LINVRNT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(osd_write_locked(env, obj));
        LASSERT(th != NULL);
@@ -2908,6 +3491,8 @@ static int osd_object_ref_del(const struct lu_env *env, struct dt_object *dt,
        ll_dirty_inode(inode, I_DIRTY_DATASYNC);
        LINVRNT(osd_invariant(obj));
 
+       osd_trans_exec_check(env, th, OSD_OT_REF_DEL);
+
        return 0;
 }
 
@@ -2929,18 +3514,19 @@ static int osd_object_version_get(const struct lu_env *env,
  * Concurrency: @dt is read locked.
  */
 static int osd_xattr_get(const struct lu_env *env, struct dt_object *dt,
-                         struct lu_buf *buf, const char *name,
-                         struct lustre_capa *capa)
+                        struct lu_buf *buf, const char *name)
 {
-        struct osd_object      *obj    = osd_dt_obj(dt);
-        struct inode           *inode  = obj->oo_inode;
-        struct osd_thread_info *info   = osd_oti_get(env);
-        struct dentry          *dentry = &info->oti_obj_dentry;
+       struct osd_object      *obj    = osd_dt_obj(dt);
+       struct inode           *inode  = obj->oo_inode;
+       struct osd_thread_info *info   = osd_oti_get(env);
+       struct dentry          *dentry = &info->oti_obj_dentry;
+       bool                    cache_xattr = false;
+       int                     rc;
 
-        /* version get is not real XATTR but uses xattr API */
-        if (strcmp(name, XATTR_NAME_VERSION) == 0) {
-                /* for version we are just using xattr API but change inode
-                 * field instead */
+       /* version get is not real XATTR but uses xattr API */
+       if (strcmp(name, XATTR_NAME_VERSION) == 0) {
+               /* for version we are just using xattr API but change inode
+                * field instead */
                if (buf->lb_len == 0)
                        return sizeof(dt_obj_version_t);
 
@@ -2950,19 +3536,35 @@ static int osd_xattr_get(const struct lu_env *env, struct dt_object *dt,
                osd_object_version_get(env, dt, buf->lb_buf);
 
                return sizeof(dt_obj_version_t);
-        }
+       }
+
+       if (!dt_object_exists(dt))
+               return -ENOENT;
 
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(inode->i_op != NULL);
        LASSERT(inode->i_op->getxattr != NULL);
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_META_READ))
-               return -EACCES;
+       if (strcmp(name, XATTR_NAME_LOV) == 0 ||
+           strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
+               cache_xattr = true;
 
-       return __osd_xattr_get(inode, dentry, name, buf->lb_buf, buf->lb_len);
-}
+       if (cache_xattr) {
+               rc = osd_oxc_get(obj, name, buf);
+               if (rc != -ENOENT)
+                       return rc;
+       }
+
+       rc = __osd_xattr_get(inode, dentry, name, buf->lb_buf, buf->lb_len);
+       if (cache_xattr) {
+               if (rc == -ENOENT || rc == -ENODATA)
+                       osd_oxc_add(obj, name, NULL, 0);
+               else if (rc > 0 && buf->lb_buf != NULL)
+                       osd_oxc_add(obj, name, buf->lb_buf, rc);
+       }
 
+       return rc;
+}
 
 static int osd_declare_xattr_set(const struct lu_env *env,
                                  struct dt_object *dt,
@@ -2978,25 +3580,50 @@ static int osd_declare_xattr_set(const struct lu_env *env,
        oh = container_of0(handle, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle == NULL);
 
-       /* optimistic optimization: LMA is set first and usually fit inode */
        if (strcmp(name, XATTR_NAME_LMA) == 0) {
-               if (dt_object_exists(dt))
+               /* For non-upgrading case, the LMA is set first and
+                * usually fit inode. But for upgrade case, the LMA
+                * may be in another separated EA block. */
+               if (!dt_object_exists(dt))
                        credits = 0;
-               else
+               else if (fl == LU_XATTR_REPLACE)
                        credits = 1;
+               else
+                       goto upgrade;
        } else if (strcmp(name, XATTR_NAME_VERSION) == 0) {
                credits = 1;
        } else {
+upgrade:
                credits = osd_dto_credits_noquota[DTO_XATTR_SET];
-               if (buf && buf->lb_len > sb->s_blocksize) {
-                       credits *= (buf->lb_len + sb->s_blocksize - 1) >>
-                                       sb->s_blocksize_bits;
+
+               if (buf != NULL) {
+                       ssize_t buflen;
+
+                       if (buf->lb_buf == NULL && dt_object_exists(dt)) {
+                               /* learn xattr size from osd_xattr_get if
+                                  attribute has not been read yet */
+                               buflen = __osd_xattr_get(
+                                   osd_dt_obj(dt)->oo_inode,
+                                   &osd_oti_get(env)->oti_obj_dentry,
+                                   name, NULL, 0);
+                               if (buflen < 0)
+                                       buflen = 0;
+                       } else {
+                               buflen = buf->lb_len;
+                       }
+
+                       if (buflen > sb->s_blocksize) {
+                               credits += osd_calc_bkmap_credits(
+                                   sb, NULL, 0, -1,
+                                   (buflen + sb->s_blocksize - 1) >>
+                                   sb->s_blocksize_bits);
+                       }
                }
                /*
                 * xattr set may involve inode quota change, reserve credits for
                 * dquot_initialize()
                 */
-               oh->ot_credits += LDISKFS_MAXQUOTAS_INIT_BLOCKS(sb);
+               credits += LDISKFS_MAXQUOTAS_INIT_BLOCKS(sb);
        }
 
        osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET, credits);
@@ -3026,28 +3653,26 @@ static void osd_object_version_set(const struct lu_env *env,
  * Concurrency: @dt is write locked.
  */
 static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
-                         const struct lu_buf *buf, const char *name, int fl,
-                         struct thandle *handle, struct lustre_capa *capa)
+                        const struct lu_buf *buf, const char *name, int fl,
+                        struct thandle *handle)
 {
        struct osd_object      *obj      = osd_dt_obj(dt);
        struct inode           *inode    = obj->oo_inode;
        struct osd_thread_info *info     = osd_oti_get(env);
        int                     fs_flags = 0;
+       int                     rc;
        ENTRY;
 
-        LASSERT(handle != NULL);
-
-        /* version set is not real XATTR */
-        if (strcmp(name, XATTR_NAME_VERSION) == 0) {
-                /* for version we are just using xattr API but change inode
-                 * field instead */
-                LASSERT(buf->lb_len == sizeof(dt_obj_version_t));
-                osd_object_version_set(env, dt, buf->lb_buf);
-                return sizeof(dt_obj_version_t);
-        }
+       LASSERT(handle != NULL);
 
-        if (osd_object_auth(env, dt, capa, CAPA_OPC_META_WRITE))
-                return -EACCES;
+       /* version set is not real XATTR */
+       if (strcmp(name, XATTR_NAME_VERSION) == 0) {
+               /* for version we are just using xattr API but change inode
+                * field instead */
+               LASSERT(buf->lb_len == sizeof(dt_obj_version_t));
+               osd_object_version_set(env, dt, buf->lb_buf);
+               return sizeof(dt_obj_version_t);
+       }
 
        CDEBUG(D_INODE, DFID" set xattr '%s' with size %zu\n",
               PFID(lu_object_fid(&dt->do_lu)), name, buf->lb_len);
@@ -3079,29 +3704,36 @@ static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
            strcmp(name, XATTR_NAME_LINK) == 0)
                return -ENOSPC;
 
-       return __osd_xattr_set(info, inode, name, buf->lb_buf, buf->lb_len,
+       rc = __osd_xattr_set(info, inode, name, buf->lb_buf, buf->lb_len,
                               fs_flags);
+       osd_trans_exec_check(env, handle, OSD_OT_XATTR_SET);
+
+       if (rc == 0 &&
+           (strcmp(name, XATTR_NAME_LOV) == 0 ||
+            strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0))
+               osd_oxc_add(obj, name, buf->lb_buf, buf->lb_len);
+
+       return rc;
 }
 
 /*
  * Concurrency: @dt is read locked.
  */
 static int osd_xattr_list(const struct lu_env *env, struct dt_object *dt,
-                         const struct lu_buf *buf, struct lustre_capa *capa)
+                         const struct lu_buf *buf)
 {
        struct osd_object      *obj    = osd_dt_obj(dt);
        struct inode           *inode  = obj->oo_inode;
        struct osd_thread_info *info   = osd_oti_get(env);
        struct dentry          *dentry = &info->oti_obj_dentry;
 
-       LASSERT(dt_object_exists(dt));
+       if (!dt_object_exists(dt))
+               return -ENOENT;
+
        LASSERT(!dt_object_remote(dt));
        LASSERT(inode->i_op != NULL);
        LASSERT(inode->i_op->listxattr != NULL);
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_META_READ))
-               return -EACCES;
-
        dentry->d_inode = inode;
        dentry->d_sb = inode->i_sb;
        return inode->i_op->listxattr(dentry, buf->lb_buf, buf->lb_len);
@@ -3114,7 +3746,6 @@ static int osd_declare_xattr_del(const struct lu_env *env,
        struct osd_thandle *oh;
        struct super_block *sb = osd_sb(osd_dev(dt->do_lu.lo_dev));
 
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(handle != NULL);
 
@@ -3136,8 +3767,7 @@ static int osd_declare_xattr_del(const struct lu_env *env,
  * Concurrency: @dt is write locked.
  */
 static int osd_xattr_del(const struct lu_env *env, struct dt_object *dt,
-                        const char *name, struct thandle *handle,
-                        struct lustre_capa *capa)
+                        const char *name, struct thandle *handle)
 {
        struct osd_object      *obj    = osd_dt_obj(dt);
        struct inode           *inode  = obj->oo_inode;
@@ -3145,109 +3775,28 @@ static int osd_xattr_del(const struct lu_env *env, struct dt_object *dt,
        struct dentry          *dentry = &info->oti_obj_dentry;
        int                     rc;
 
-       LASSERT(dt_object_exists(dt));
+       if (!dt_object_exists(dt))
+               return -ENOENT;
+
        LASSERT(!dt_object_remote(dt));
        LASSERT(inode->i_op != NULL);
        LASSERT(inode->i_op->removexattr != NULL);
        LASSERT(handle != NULL);
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_META_WRITE))
-               return -EACCES;
-
        osd_trans_exec_op(env, handle, OSD_OT_XATTR_SET);
 
        ll_vfs_dq_init(inode);
        dentry->d_inode = inode;
        dentry->d_sb = inode->i_sb;
        rc = inode->i_op->removexattr(dentry, name);
-       return rc;
-}
-
-static struct obd_capa *osd_capa_get(const struct lu_env *env,
-                                    struct dt_object *dt,
-                                    struct lustre_capa *old, __u64 opc)
-{
-       struct osd_thread_info *info = osd_oti_get(env);
-       const struct lu_fid *fid = lu_object_fid(&dt->do_lu);
-       struct osd_object *obj = osd_dt_obj(dt);
-       struct osd_device *osd = osd_obj2dev(obj);
-       struct lustre_capa_key *key = &info->oti_capa_key;
-       struct lustre_capa *capa = &info->oti_capa;
-       struct obd_capa *oc;
-       struct lu_capainfo *lci;
-       int rc;
-       ENTRY;
-
-       if (!osd->od_fl_capa)
-               RETURN(ERR_PTR(-ENOENT));
-
-       LASSERT(dt_object_exists(dt));
-       LASSERT(!dt_object_remote(dt));
-       LINVRNT(osd_invariant(obj));
-
-       /* renewal sanity check */
-       if (old && osd_object_auth(env, dt, old, opc))
-               RETURN(ERR_PTR(-EACCES));
-
-       lci = lu_capainfo_get(env);
-       if (unlikely(lci == NULL))
-               RETURN(ERR_PTR(-ENOENT));
-
-       switch (lci->lci_auth) {
-       case LC_ID_NONE:
-               RETURN(NULL);
-       case LC_ID_PLAIN:
-               capa->lc_uid = i_uid_read(obj->oo_inode);
-               capa->lc_gid = i_gid_read(obj->oo_inode);
-               capa->lc_flags = LC_ID_PLAIN;
-               break;
-       case LC_ID_CONVERT: {
-               __u32 d[4], s[4];
-
-               s[0] = i_uid_read(obj->oo_inode);
-               cfs_get_random_bytes(&(s[1]), sizeof(__u32));
-               s[2] = i_uid_read(obj->oo_inode);
-               cfs_get_random_bytes(&(s[3]), sizeof(__u32));
-               rc = capa_encrypt_id(d, s, key->lk_key, CAPA_HMAC_KEY_MAX_LEN);
-               if (unlikely(rc))
-                       RETURN(ERR_PTR(rc));
-
-               capa->lc_uid   = ((__u64)d[1] << 32) | d[0];
-               capa->lc_gid   = ((__u64)d[3] << 32) | d[2];
-               capa->lc_flags = LC_ID_CONVERT;
-               break;
-        }
-       default:
-               RETURN(ERR_PTR(-EINVAL));
-       }
-
-       capa->lc_fid = *fid;
-       capa->lc_opc = opc;
-       capa->lc_flags |= osd->od_capa_alg << 24;
-       capa->lc_timeout = osd->od_capa_timeout;
-       capa->lc_expiry = 0;
+       osd_trans_exec_check(env, handle, OSD_OT_XATTR_SET);
 
-       oc = capa_lookup(osd->od_capa_hash, capa, 1);
-       if (oc) {
-               LASSERT(!capa_is_expired(oc));
-               RETURN(oc);
-       }
-
-       spin_lock(&capa_lock);
-       *key = osd->od_capa_keys[1];
-       spin_unlock(&capa_lock);
-
-       capa->lc_keyid = key->lk_keyid;
-       capa->lc_expiry = cfs_time_current_sec() + osd->od_capa_timeout;
-
-       rc = capa_hmac(capa->lc_hmac, capa, key->lk_key);
-       if (rc) {
-               DEBUG_CAPA(D_ERROR, capa, "HMAC failed: %d for", rc);
-               RETURN(ERR_PTR(rc));
-       }
+       if (rc == 0 &&
+           (strcmp(name, XATTR_NAME_LOV) == 0 ||
+            strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0))
+               osd_oxc_del(obj, name);
 
-       oc = capa_add(osd->od_capa_hash, capa);
-       RETURN(oc);
+       return rc;
 }
 
 static int osd_object_sync(const struct lu_env *env, struct dt_object *dt,
@@ -3264,7 +3813,7 @@ static int osd_object_sync(const struct lu_env *env, struct dt_object *dt,
 
        dentry->d_inode = inode;
        dentry->d_sb = inode->i_sb;
-       file->f_dentry = dentry;
+       file->f_path.dentry = dentry;
        file->f_mapping = inode->i_mapping;
        file->f_op = inode->i_fop;
        set_file_inode(file, inode);
@@ -3274,14 +3823,9 @@ static int osd_object_sync(const struct lu_env *env, struct dt_object *dt,
        RETURN(rc);
 }
 
-static int osd_data_get(const struct lu_env *env, struct dt_object *dt,
-                        void **data)
+static int osd_invalidate(const struct lu_env *env, struct dt_object *dt)
 {
-        struct osd_object *obj = osd_dt_obj(dt);
-        ENTRY;
-
-        *data = (void *)obj->oo_inode;
-        RETURN(0);
+       return 0;
 }
 
 /*
@@ -3356,7 +3900,7 @@ static int osd_index_try(const struct lu_env *env, struct dt_object *dt,
                 result = 0;
        } else if (feat == &dt_directory_features) {
                 dt->do_index_ops = &osd_index_ea_ops;
-               if (obj->oo_inode != NULL && S_ISDIR(obj->oo_inode->i_mode))
+               if (obj->oo_inode == NULL || S_ISDIR(obj->oo_inode->i_mode))
                         result = 0;
                 else
                         result = -ENOTDIR;
@@ -3410,17 +3954,16 @@ static int osd_index_try(const struct lu_env *env, struct dt_object *dt,
         }
         LINVRNT(osd_invariant(obj));
 
-       if (result == 0 && is_quota_glb_feat(feat) &&
+       if (result == 0 && feat == &dt_quota_glb_features &&
            fid_seq(lu_object_fid(&dt->do_lu)) == FID_SEQ_QUOTA_GLB)
-               result = osd_quota_migration(env, dt, feat);
+               result = osd_quota_migration(env, dt);
 
         return result;
 }
 
 static int osd_otable_it_attr_get(const struct lu_env *env,
                                 struct dt_object *dt,
-                                struct lu_attr *attr,
-                                struct lustre_capa *capa)
+                                struct lu_attr *attr)
 {
        attr->la_valid = 0;
        return 0;
@@ -3451,9 +3994,8 @@ static const struct dt_object_operations osd_obj_ops = {
         .do_declare_xattr_del = osd_declare_xattr_del,
         .do_xattr_del         = osd_xattr_del,
         .do_xattr_list        = osd_xattr_list,
-        .do_capa_get          = osd_capa_get,
         .do_object_sync       = osd_object_sync,
-        .do_data_get          = osd_data_get,
+       .do_invalidate        = osd_invalidate,
 };
 
 /**
@@ -3485,9 +4027,8 @@ static const struct dt_object_operations osd_obj_ea_ops = {
         .do_declare_xattr_del = osd_declare_xattr_del,
         .do_xattr_del         = osd_xattr_del,
         .do_xattr_list        = osd_xattr_list,
-        .do_capa_get          = osd_capa_get,
         .do_object_sync       = osd_object_sync,
-        .do_data_get          = osd_data_get,
+       .do_invalidate        = osd_invalidate,
 };
 
 static const struct dt_object_operations osd_obj_otable_it_ops = {
@@ -3505,8 +4046,9 @@ static int osd_index_declare_iam_delete(const struct lu_env *env,
         oh = container_of0(handle, struct osd_thandle, ot_super);
         LASSERT(oh->ot_handle == NULL);
 
+       /* Recycle  may cause additional three blocks to be changed. */
        osd_trans_declare_op(env, oh, OSD_OT_DELETE,
-                            osd_dto_credits_noquota[DTO_INDEX_DELETE]);
+                            osd_dto_credits_noquota[DTO_INDEX_DELETE] + 3);
 
        return 0;
 }
@@ -3524,8 +4066,7 @@ static int osd_index_declare_iam_delete(const struct lu_env *env,
  */
 static int osd_index_iam_delete(const struct lu_env *env, struct dt_object *dt,
                                const struct dt_key *key,
-                               struct thandle *handle,
-                               struct lustre_capa *capa)
+                               struct thandle *handle)
 {
        struct osd_thread_info *oti = osd_oti_get(env);
        struct osd_object      *obj = osd_dt_obj(dt);
@@ -3535,15 +4076,14 @@ static int osd_index_iam_delete(const struct lu_env *env, struct dt_object *dt,
        int                     rc;
        ENTRY;
 
+       if (!dt_object_exists(dt))
+               RETURN(-ENOENT);
+
        LINVRNT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(bag->ic_object == obj->oo_inode);
        LASSERT(handle != NULL);
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_INDEX_DELETE))
-               RETURN(-EACCES);
-
        osd_trans_exec_op(env, handle, OSD_OT_DELETE);
 
         ipd = osd_idx_ipd_get(env, bag);
@@ -3563,6 +4103,7 @@ static int osd_index_iam_delete(const struct lu_env *env, struct dt_object *dt,
         rc = iam_delete(oh->ot_handle, bag, (const struct iam_key *)key, ipd);
         osd_ipd_put(env, bag, ipd);
         LINVRNT(osd_invariant(obj));
+       osd_trans_exec_check(env, handle, OSD_OT_DELETE);
         RETURN(rc);
 }
 
@@ -3576,18 +4117,20 @@ static int osd_index_declare_ea_delete(const struct lu_env *env,
        int                 rc;
        ENTRY;
 
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(handle != NULL);
 
        oh = container_of0(handle, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle == NULL);
 
+       /* due to DNE we may need to remove an agent inode */
        osd_trans_declare_op(env, oh, OSD_OT_DELETE,
-                            osd_dto_credits_noquota[DTO_INDEX_DELETE]);
+                            osd_dto_credits_noquota[DTO_INDEX_DELETE] +
+                            osd_dto_credits_noquota[DTO_OBJECT_DELETE]);
 
        inode = osd_dt_obj(dt)->oo_inode;
-       LASSERT(inode);
+       if (inode == NULL)
+               RETURN(-ENOENT);
 
        rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
                                   0, oh, osd_dt_obj(dt), true, NULL, false);
@@ -3603,6 +4146,8 @@ static inline int osd_get_fid_from_dentry(struct ldiskfs_dir_entry_2 *de,
         if (de->file_type & LDISKFS_DIRENT_LUFID) {
                 rec = (struct osd_fid_pack *) (de->name + de->name_len + 1);
                 rc = osd_fid_unpack((struct lu_fid *)fid, rec);
+               if (rc == 0 && unlikely(!fid_is_sane((struct lu_fid *)fid)))
+                       rc = -EINVAL;
         }
        return rc;
 }
@@ -3641,8 +4186,7 @@ static int osd_remote_fid(const struct lu_env *env, struct osd_device *osd,
  * \retval -ve, on error
  */
 static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
-                              const struct dt_key *key, struct thandle *handle,
-                              struct lustre_capa *capa)
+                              const struct dt_key *key, struct thandle *handle)
 {
        struct osd_object          *obj = osd_dt_obj(dt);
        struct inode               *dir = obj->oo_inode;
@@ -3656,8 +4200,10 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
        int                        rc;
        ENTRY;
 
+       if (!dt_object_exists(dt))
+               RETURN(-ENOENT);
+
        LINVRNT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(handle != NULL);
 
@@ -3667,9 +4213,6 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
         LASSERT(oh->ot_handle != NULL);
         LASSERT(oh->ot_handle->h_transaction != NULL);
 
-        if (osd_object_auth(env, dt, capa, CAPA_OPC_INDEX_DELETE))
-                RETURN(-EACCES);
-
        ll_vfs_dq_init(dir);
         dentry = osd_child_dentry_get(env, obj,
                                       (char *)key, strlen((char *)key));
@@ -3683,9 +4226,7 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
         }
 
         bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
-        if (bh) {
-               __u32 ino = 0;
-
+       if (!IS_ERR(bh)) {
                /* If this is not the ".." entry, it might be a remote DNE
                 * entry and  we need to check if the FID is for a remote
                 * MDT.  If the FID is  not in the directory entry (e.g.
@@ -3703,59 +4244,22 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
                if (strcmp((char *)key, dotdot) != 0) {
                        LASSERT(de != NULL);
                        rc = osd_get_fid_from_dentry(de, (struct dt_rec *)fid);
-                       /* If Fid is not in dentry, try to get it from LMA */
                        if (rc == -ENODATA) {
-                               struct osd_inode_id *id;
-                               struct inode *inode;
-
-                               /* Before trying to get fid from the inode,
-                                * check whether the inode is valid.
-                                *
-                                * If the inode has been deleted, do not go
-                                * ahead to do osd_ea_fid_get, which will set
-                                * the inode to bad inode, which might cause
-                                * the inode to be deleted uncorrectly */
-                               inode = ldiskfs_iget(osd_sb(osd),
-                                                    le32_to_cpu(de->inode));
-                               if (IS_ERR(inode)) {
-                                       CDEBUG(D_INODE, "%s: "DFID"get inode"
-                                              "error.\n", osd_name(osd),
-                                              PFID(fid));
-                                       rc = PTR_ERR(inode);
-                               } else {
-                                       if (likely(inode->i_nlink != 0)) {
-                                               id = &osd_oti_get(env)->oti_id;
-                                               rc = osd_ea_fid_get(env, obj,
-                                                       le32_to_cpu(de->inode),
-                                                                   fid, id);
-                                       } else {
-                                               CDEBUG(D_INFO, "%s: %u "DFID
-                                                      "deleted.\n",
-                                                      osd_name(osd),
-                                                      le32_to_cpu(de->inode),
-                                                      PFID(fid));
-                                               rc = -ESTALE;
-                                       }
-                                       iput(inode);
-                               }
+                               /* can't get FID, postpone to the end of the
+                                * transaction when iget() is safe */
+                               osd_schedule_agent_inode_removal(env, oh,
+                                               le32_to_cpu(de->inode));
+                       } else if (rc == 0 &&
+                                  unlikely(osd_remote_fid(env, osd, fid))) {
+                               osd_schedule_agent_inode_removal(env, oh,
+                                               le32_to_cpu(de->inode));
                        }
-                       if (rc == 0 &&
-                           unlikely(osd_remote_fid(env, osd, fid)))
-                               /* Need to delete agent inode */
-                               ino = le32_to_cpu(de->inode);
-               }
-                rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
-                brelse(bh);
-               if (rc == 0 && unlikely(ino != 0)) {
-                       rc = osd_delete_local_agent_inode(env, osd, fid, ino,
-                                                         oh);
-                       if (rc != 0)
-                               CERROR("%s: del local inode "DFID": rc = %d\n",
-                                      osd_name(osd), PFID(fid), rc);
                }
-        } else {
-                rc = -ENOENT;
-        }
+               rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
+               brelse(bh);
+       } else {
+               rc = PTR_ERR(bh);
+       }
         if (hlock != NULL)
                 ldiskfs_htree_unlock(hlock);
         else
@@ -3783,6 +4287,7 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
 out:
 
         LASSERT(osd_invariant(obj));
+       osd_trans_exec_check(env, handle, OSD_OT_DELETE);
         RETURN(rc);
 }
 
@@ -3798,8 +4303,7 @@ out:
  *      \retval -ve   failure
  */
 static int osd_index_iam_lookup(const struct lu_env *env, struct dt_object *dt,
-                               struct dt_rec *rec, const struct dt_key *key,
-                               struct lustre_capa *capa)
+                               struct dt_rec *rec, const struct dt_key *key)
 {
        struct osd_object      *obj = osd_dt_obj(dt);
        struct iam_path_descr  *ipd;
@@ -3810,14 +4314,13 @@ static int osd_index_iam_lookup(const struct lu_env *env, struct dt_object *dt,
        int                     rc;
        ENTRY;
 
+       if (!dt_object_exists(dt))
+               RETURN(-ENOENT);
+
        LASSERT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(bag->ic_object == obj->oo_inode);
 
-        if (osd_object_auth(env, dt, capa, CAPA_OPC_INDEX_LOOKUP))
-                RETURN(-EACCES);
-
         ipd = osd_idx_ipd_get(env, bag);
         if (IS_ERR(ipd))
                 RETURN(-ENOMEM);
@@ -3889,26 +4392,27 @@ static int osd_index_declare_iam_insert(const struct lu_env *env,
 static int osd_index_iam_insert(const struct lu_env *env, struct dt_object *dt,
                                const struct dt_rec *rec,
                                const struct dt_key *key, struct thandle *th,
-                               struct lustre_capa *capa, int ignore_quota)
+                               int ignore_quota)
 {
        struct osd_object     *obj = osd_dt_obj(dt);
        struct iam_path_descr *ipd;
        struct osd_thandle    *oh;
-       struct iam_container  *bag = &obj->oo_dir->od_container;
+       struct iam_container  *bag;
        struct osd_thread_info *oti = osd_oti_get(env);
        struct iam_rec         *iam_rec;
        int                     rc;
        ENTRY;
 
+       if (!dt_object_exists(dt))
+               RETURN(-ENOENT);
+
        LINVRNT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
+
+       bag = &obj->oo_dir->od_container;
        LASSERT(bag->ic_object == obj->oo_inode);
        LASSERT(th != NULL);
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_INDEX_INSERT))
-               RETURN(-EACCES);
-
        osd_trans_exec_op(env, th, OSD_OT_INSERT);
 
         ipd = osd_idx_ipd_get(env, bag);
@@ -3936,6 +4440,7 @@ static int osd_index_iam_insert(const struct lu_env *env, struct dt_object *dt,
                         iam_rec, ipd);
         osd_ipd_put(env, bag, ipd);
         LINVRNT(osd_invariant(obj));
+       osd_trans_exec_check(env, th, OSD_OT_INSERT);
         RETURN(rc);
 }
 
@@ -3971,7 +4476,8 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
        child = osd_child_dentry_get(info->oti_env, pobj, name, strlen(name));
        child->d_fsdata = (void *)ldp;
        ll_vfs_dq_init(pobj->oo_inode);
-       rc = osd_ldiskfs_add_entry(oth->ot_handle, child, cinode, hlock);
+       rc = osd_ldiskfs_add_entry(info, oth->ot_handle, child,
+                                  cinode, hlock);
        if (rc == 0 && OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_TYPE)) {
                struct ldiskfs_dir_entry_2      *de;
                struct buffer_head              *bh;
@@ -3979,7 +4485,7 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
 
                bh = osd_ldiskfs_find_entry(pobj->oo_inode, &child->d_name, &de,
                                            NULL, hlock);
-               if (bh != NULL) {
+               if (!IS_ERR(bh)) {
                        rc1 = ldiskfs_journal_get_write_access(oth->ot_handle,
                                                               bh);
                        if (rc1 == 0) {
@@ -3989,10 +4495,10 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
                                else
                                        de->file_type = LDISKFS_DIRENT_LUFID |
                                                        LDISKFS_FT_DIR;
-                               ldiskfs_journal_dirty_metadata(oth->ot_handle,
-                                                              bh);
-                               brelse(bh);
+                               ldiskfs_handle_dirty_metadata(oth->ot_handle,
+                                                             NULL, bh);
                        }
+                       brelse(bh);
                }
        }
 
@@ -4030,7 +4536,7 @@ static int osd_add_dot_dotdot(struct osd_thread_info *info,
                 if (dir->oo_compat_dot_created) {
                         result = -EEXIST;
                 } else {
-                        LASSERT(inode == parent_dir);
+                       LASSERT(inode->i_ino == parent_dir->i_ino);
                         dir->oo_compat_dot_created = 1;
                         result = 0;
                 }
@@ -4118,7 +4624,7 @@ static int osd_ea_add_rec(const struct lu_env *env, struct osd_object *pobj,
         return rc;
 }
 
-static void
+static int
 osd_consistency_check(struct osd_thread_info *oti, struct osd_device *dev,
                      struct osd_idmap_cache *oic)
 {
@@ -4130,19 +4636,39 @@ osd_consistency_check(struct osd_thread_info *oti, struct osd_device *dev,
        ENTRY;
 
        if (!fid_is_norm(fid) && !fid_is_igif(fid))
-               RETURN_EXIT;
+               RETURN(0);
 
        if (scrub->os_pos_current > id->oii_ino)
-               RETURN_EXIT;
+               RETURN(0);
 
 again:
-       rc = osd_oi_lookup(oti, dev, fid, id, OI_CHECK_FLD);
-       if (rc != 0 && rc != -ENOENT)
-               RETURN_EXIT;
+       rc = osd_oi_lookup(oti, dev, fid, id, 0);
+       if (rc == -ENOENT) {
+               struct inode *inode;
+
+               *id = oic->oic_lid;
+               inode = osd_iget(oti, dev, &oic->oic_lid);
+
+               /* The inode has been removed (by race maybe). */
+               if (IS_ERR(inode)) {
+                       rc = PTR_ERR(inode);
 
-       if (rc == 0 && osd_id_eq(id, &oic->oic_lid))
-               RETURN_EXIT;
+                       RETURN(rc == -ESTALE ? -ENOENT : rc);
+               }
+
+               iput(inode);
+               /* The OI mapping is lost. */
+               if (id->oii_gen != OSD_OII_NOGEN)
+                       goto trigger;
+
+               /* The inode may has been reused by others, we do not know,
+                * leave it to be handled by subsequent osd_fid_lookup(). */
+               RETURN(0);
+       } else if (rc != 0 || osd_id_eq(id, &oic->oic_lid)) {
+               RETURN(rc);
+       }
 
+trigger:
        if (thread_is_running(&scrub->os_thread)) {
                rc = osd_oii_insert(dev, oic, rc == -ENOENT);
                /* There is race condition between osd_oi_lookup and OI scrub.
@@ -4152,21 +4678,21 @@ again:
                if (unlikely(rc == -EAGAIN))
                        goto again;
 
-               RETURN_EXIT;
+               RETURN(0);
        }
 
        if (!dev->od_noscrub && ++once == 1) {
                rc = osd_scrub_start(dev, SS_AUTO_PARTIAL | SS_CLEAR_DRYRUN |
                                     SS_CLEAR_FAILOUT);
-               LCONSOLE_WARN("%.16s: trigger OI scrub by RPC for "DFID
-                             ", rc = %d [2]\n",
-                             LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name,
-                             PFID(fid), rc);
+               CDEBUG(D_LFSCK | D_CONSOLE, "%.16s: trigger OI scrub by RPC "
+                      "for "DFID", rc = %d [2]\n",
+                      LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name,
+                      PFID(fid), rc);
                if (rc == 0 || rc == -EALREADY)
                        goto again;
        }
 
-       EXIT;
+       RETURN(0);
 }
 
 static int osd_fail_fid_lookup(struct osd_thread_info *oti,
@@ -4234,7 +4760,7 @@ static int osd_get_pfid_from_linkea(const struct lu_env *env,
        struct lu_buf           *buf    = &oti->oti_big_buf;
        struct dentry           *dentry = &oti->oti_obj_dentry;
        struct inode            *inode  = obj->oo_inode;
-       struct linkea_data       ldata  = { 0 };
+       struct linkea_data       ldata  = { NULL };
        int                      rc;
        ENTRY;
 
@@ -4317,7 +4843,7 @@ static int osd_ea_lookup_rec(const struct lu_env *env, struct osd_object *obj,
        }
 
        bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
-       if (bh) {
+       if (!IS_ERR(bh)) {
                struct osd_thread_info *oti = osd_oti_get(env);
                struct osd_inode_id *id = &oti->oti_id;
                struct osd_idmap_cache *oic = &oti->oti_cache;
@@ -4335,29 +4861,35 @@ static int osd_ea_lookup_rec(const struct lu_env *env, struct osd_object *obj,
                /* done with de, release bh */
                brelse(bh);
                if (rc != 0) {
-                       if (unlikely(ino == osd_remote_parent_ino(dev)))
+                       if (unlikely(ino == osd_remote_parent_ino(dev))) {
+                               const char *name = (const char *)key;
+
                                /* If the parent is on remote MDT, and there
                                 * is no FID-in-dirent, then we have to get
                                 * the parent FID from the linkEA.  */
-                               rc = osd_get_pfid_from_linkea(env, obj, fid);
-                       else
+                               if (likely(strlen(name) == 2 &&
+                                          name[0] == '.' && name[1] == '.'))
+                                       rc = osd_get_pfid_from_linkea(env, obj,
+                                                                     fid);
+                       } else {
                                rc = osd_ea_fid_get(env, obj, ino, fid, id);
+                       }
                } else {
                        osd_id_gen(id, ino, OSD_OII_NOGEN);
                }
 
-               if (rc != 0) {
+               if (rc != 0 || osd_remote_fid(env, dev, fid)) {
                        fid_zero(&oic->oic_fid);
+
                        GOTO(out, rc);
                }
 
-               if (osd_remote_fid(env, dev, fid))
-                       GOTO(out, rc = 0);
-
                osd_add_oi_cache(osd_oti_get(env), osd_obj2dev(obj), id, fid);
-               osd_consistency_check(oti, dev, oic);
+               rc = osd_consistency_check(oti, dev, oic);
+               if (rc != 0)
+                       fid_zero(&oic->oic_fid);
        } else {
-               rc = -ENOENT;
+               rc = PTR_ERR(bh);
        }
 
        GOTO(out, rc);
@@ -4371,65 +4903,6 @@ out:
 }
 
 /**
- * Find the osd object for given fid.
- *
- * \param fid need to find the osd object having this fid
- *
- * \retval osd_object on success
- * \retval        -ve on error
- */
-static struct osd_object *osd_object_find(const struct lu_env *env,
-                                         struct dt_object *dt,
-                                         const struct lu_fid *fid)
-{
-        struct lu_device  *ludev = dt->do_lu.lo_dev;
-        struct osd_object *child = NULL;
-        struct lu_object  *luch;
-        struct lu_object  *lo;
-
-       /*
-        * at this point topdev might not exist yet
-        * (i.e. MGS is preparing profiles). so we can
-        * not rely on topdev and instead lookup with
-        * our device passed as topdev. this can't work
-        * if the object isn't cached yet (as osd doesn't
-        * allocate lu_header). IOW, the object must be
-        * in the cache, otherwise lu_object_alloc() crashes
-        * -bzzz
-        */
-       luch = lu_object_find_at(env, ludev->ld_site->ls_top_dev == NULL ?
-                                ludev : ludev->ld_site->ls_top_dev,
-                                fid, NULL);
-       if (!IS_ERR(luch)) {
-               if (lu_object_exists(luch)) {
-                       lo = lu_object_locate(luch->lo_header, ludev->ld_type);
-                       if (lo != NULL)
-                               child = osd_obj(lo);
-                       else
-                               LU_OBJECT_DEBUG(D_ERROR, env, luch,
-                                               "lu_object can't be located"
-                                               DFID"\n", PFID(fid));
-
-                        if (child == NULL) {
-                                lu_object_put(env, luch);
-                                CERROR("Unable to get osd_object\n");
-                                child = ERR_PTR(-ENOENT);
-                        }
-                } else {
-                        LU_OBJECT_DEBUG(D_ERROR, env, luch,
-                                        "lu_object does not exists "DFID"\n",
-                                        PFID(fid));
-                       lu_object_put(env, luch);
-                        child = ERR_PTR(-ENOENT);
-                }
-       } else {
-               child = ERR_CAST(luch);
-       }
-
-       return child;
-}
-
-/**
  * Put the osd object once done with it.
  *
  * \param obj osd object that needs to be put
@@ -4448,18 +4921,37 @@ static int osd_index_declare_ea_insert(const struct lu_env *env,
 {
        struct osd_thandle      *oh;
        struct osd_device       *osd   = osd_dev(dt->do_lu.lo_dev);
-       struct lu_fid           *fid = (struct lu_fid *)rec;
-       int                     rc;
+       struct dt_insert_rec    *rec1   = (struct dt_insert_rec *)rec;
+       const struct lu_fid     *fid    = rec1->rec_fid;
+       int                      credits, rc = 0;
+       struct osd_idmap_cache  *idc;
        ENTRY;
 
        LASSERT(!dt_object_remote(dt));
        LASSERT(handle != NULL);
+       LASSERT(fid != NULL);
+       LASSERT(rec1->rec_type != 0);
 
        oh = container_of0(handle, struct osd_thandle, ot_super);
        LASSERT(oh->ot_handle == NULL);
 
-       osd_trans_declare_op(env, oh, OSD_OT_INSERT,
-                            osd_dto_credits_noquota[DTO_INDEX_INSERT]);
+       credits = osd_dto_credits_noquota[DTO_INDEX_INSERT];
+
+       /* we can't call iget() while a transactions is running
+        * (this can lead to a deadlock), but we need to know
+        * inum and object type. so we find this information at
+        * declaration and cache in per-thread info */
+       idc = osd_idc_find_or_init(env, osd, fid);
+       if (IS_ERR(idc))
+               RETURN(PTR_ERR(idc));
+       if (idc->oic_remote) {
+               /* a reference to remote inode is represented by an
+                * agent inode which we have to create */
+               credits += osd_dto_credits_noquota[DTO_OBJECT_CREATE];
+               credits += osd_dto_credits_noquota[DTO_INDEX_INSERT];
+       }
+
+       osd_trans_declare_op(env, oh, OSD_OT_INSERT, credits);
 
        if (osd_dt_obj(dt)->oo_inode != NULL) {
                struct inode *inode = osd_dt_obj(dt)->oo_inode;
@@ -4472,22 +4964,6 @@ static int osd_index_declare_ea_insert(const struct lu_env *env,
                                           osd_dt_obj(dt), true, NULL, false);
        }
 
-       if (fid == NULL)
-               RETURN(0);
-
-       rc = osd_remote_fid(env, osd, fid);
-       if (rc <= 0)
-               RETURN(rc);
-
-       rc = 0;
-
-       osd_trans_declare_op(env, oh, OSD_OT_CREATE,
-                            osd_dto_credits_noquota[DTO_OBJECT_CREATE]);
-       osd_trans_declare_op(env, oh, OSD_OT_INSERT,
-                            osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1);
-       osd_trans_declare_op(env, oh, OSD_OT_INSERT,
-                            osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1);
-
        RETURN(rc);
 }
 
@@ -4503,9 +4979,9 @@ static int osd_index_declare_ea_insert(const struct lu_env *env,
  * \retval -ve, on error
  */
 static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
-                               const struct dt_rec *rec,
-                               const struct dt_key *key, struct thandle *th,
-                               struct lustre_capa *capa, int ignore_quota)
+                              const struct dt_rec *rec,
+                              const struct dt_key *key, struct thandle *th,
+                              int ignore_quota)
 {
        struct osd_object       *obj = osd_dt_obj(dt);
        struct osd_device       *osd = osd_dev(dt->do_lu.lo_dev);
@@ -4513,32 +4989,38 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
        const struct lu_fid     *fid    = rec1->rec_fid;
        const char              *name = (const char *)key;
        struct osd_thread_info  *oti   = osd_oti_get(env);
-       struct osd_inode_id     *id    = &oti->oti_id;
        struct inode            *child_inode = NULL;
-       struct osd_object       *child = NULL;
+       struct osd_idmap_cache  *idc;
        int                     rc;
        ENTRY;
 
+       if (!dt_object_exists(dt))
+               RETURN(-ENOENT);
+
        LASSERT(osd_invariant(obj));
-       LASSERT(dt_object_exists(dt));
        LASSERT(!dt_object_remote(dt));
        LASSERT(th != NULL);
 
        osd_trans_exec_op(env, th, OSD_OT_INSERT);
 
-       if (osd_object_auth(env, dt, capa, CAPA_OPC_INDEX_INSERT))
-               RETURN(-EACCES);
-
        LASSERTF(fid_is_sane(fid), "fid"DFID" is insane!\n", PFID(fid));
 
-       rc = osd_remote_fid(env, osd, fid);
-       if (rc < 0) {
-               CERROR("%s: Can not find object "DFID" rc %d\n",
-                      osd_name(osd), PFID(fid), rc);
-               RETURN(rc);
+       idc = osd_idc_find(env, osd, fid);
+       if (unlikely(idc == NULL)) {
+               /* this dt_insert() wasn't declared properly, so
+                * FID is missing in OI cache. we better do not
+                * lookup FID in FLDB/OI and don't risk to deadlock,
+                * but in some special cases (lfsck testing, etc)
+                * it's much simpler than fixing a caller */
+               CERROR("%s: "DFID" wasn't declared for insert\n",
+                      osd_name(osd), PFID(fid));
+               dump_stack();
+               idc = osd_idc_find_or_init(env, osd, fid);
+               if (IS_ERR(idc))
+                       RETURN(PTR_ERR(idc));
        }
 
-       if (rc == 1) {
+       if (idc->oic_remote) {
                /* Insert remote entry */
                if (strcmp(name, dotdot) == 0 && strlen(name) == 2) {
                        struct osd_mdobj_map    *omm = osd->od_mdt_map;
@@ -4564,15 +5046,23 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
                }
        } else {
                /* Insert local entry */
-               child = osd_object_find(env, dt, fid);
-               if (IS_ERR(child)) {
-                       CERROR("%s: Can not find object "DFID"%u:%u: rc = %d\n",
-                              osd_name(osd), PFID(fid),
-                              id->oii_ino, id->oii_gen,
-                              (int)PTR_ERR(child));
-                       RETURN(PTR_ERR(child));
+               if (unlikely(idc->oic_lid.oii_ino == 0)) {
+                       /* for a reason OI cache wasn't filled properly */
+                       CERROR("%s: OIC for "DFID" isn't filled\n",
+                              osd_name(osd), PFID(fid));
+                       RETURN(-EINVAL);
+               }
+               child_inode = oti->oti_inode;
+               if (unlikely(child_inode == NULL)) {
+                       struct ldiskfs_inode_info *lii;
+                       OBD_ALLOC_PTR(lii);
+                       if (lii == NULL)
+                               RETURN(-ENOMEM);
+                       child_inode = oti->oti_inode = &lii->vfs_inode;
                }
-               child_inode = igrab(child->oo_inode);
+               child_inode->i_sb = osd_sb(osd);
+               child_inode->i_ino = idc->oic_lid.oii_ino;
+               child_inode->i_mode = rec1->rec_type & S_IFMT;
        }
 
        rc = osd_ea_add_rec(env, obj, child_inode, name, fid, th);
@@ -4580,10 +5070,10 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
        CDEBUG(D_INODE, "parent %lu insert %s:%lu rc = %d\n",
               obj->oo_inode->i_ino, name, child_inode->i_ino, rc);
 
-       iput(child_inode);
-       if (child != NULL)
-               osd_object_put(env, child);
+       if (child_inode && child_inode != oti->oti_inode)
+               iput(child_inode);
        LASSERT(osd_invariant(obj));
+       osd_trans_exec_check(env, th, OSD_OT_INSERT);
        RETURN(rc);
 }
 
@@ -4594,30 +5084,21 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
  */
 
 static struct dt_it *osd_it_iam_init(const struct lu_env *env,
-                                     struct dt_object *dt,
-                                     __u32 unused,
-                                     struct lustre_capa *capa)
+                                    struct dt_object *dt,
+                                    __u32 unused)
 {
-        struct osd_it_iam      *it;
-        struct osd_thread_info *oti = osd_oti_get(env);
-        struct osd_object      *obj = osd_dt_obj(dt);
-        struct lu_object       *lo  = &dt->do_lu;
-        struct iam_path_descr  *ipd;
-        struct iam_container   *bag = &obj->oo_dir->od_container;
-
-        LASSERT(lu_object_exists(lo));
+       struct osd_it_iam      *it;
+       struct osd_object      *obj = osd_dt_obj(dt);
+       struct lu_object       *lo  = &dt->do_lu;
+       struct iam_path_descr  *ipd;
+       struct iam_container   *bag = &obj->oo_dir->od_container;
 
-        if (osd_object_auth(env, dt, capa, CAPA_OPC_BODY_READ))
-                return ERR_PTR(-EACCES);
+       if (!dt_object_exists(dt))
+               return ERR_PTR(-ENOENT);
 
-       if (oti->oti_it_inline) {
-               OBD_ALLOC_PTR(it);
-               if (it == NULL)
-                       return ERR_PTR(-ENOMEM);
-       } else {
-               it = &oti->oti_it;
-               oti->oti_it_inline = 1;
-       }
+       OBD_ALLOC_PTR(it);
+       if (it == NULL)
+               return ERR_PTR(-ENOMEM);
 
        ipd = osd_it_ipd_get(env, bag);
        if (likely(ipd != NULL)) {
@@ -4627,11 +5108,7 @@ static struct dt_it *osd_it_iam_init(const struct lu_env *env,
                iam_it_init(&it->oi_it, bag, IAM_IT_MOVE, ipd);
                return (struct dt_it *)it;
        } else {
-               if (it != &oti->oti_it)
-                       OBD_FREE_PTR(it);
-               else
-                       oti->oti_it_inline = 0;
-
+               OBD_FREE_PTR(it);
                return ERR_PTR(-ENOMEM);
        }
 }
@@ -4642,17 +5119,13 @@ static struct dt_it *osd_it_iam_init(const struct lu_env *env,
 
 static void osd_it_iam_fini(const struct lu_env *env, struct dt_it *di)
 {
-       struct osd_thread_info  *oti = osd_oti_get(env);
        struct osd_it_iam       *it  = (struct osd_it_iam *)di;
        struct osd_object       *obj = it->oi_obj;
 
        iam_it_fini(&it->oi_it);
        osd_ipd_put(env, &obj->oo_dir->od_container, it->oi_ipd);
        lu_object_put(env, &obj->oo_dt.do_lu);
-       if (it != &oti->oti_it)
-               OBD_FREE_PTR(it);
-       else
-               oti->oti_it_inline = 0;
+       OBD_FREE_PTR(it);
 }
 
 /**
@@ -4891,54 +5364,55 @@ static const struct dt_index_operations osd_index_iam_ops = {
  */
 static struct dt_it *osd_it_ea_init(const struct lu_env *env,
                                    struct dt_object *dt,
-                                   __u32 attr,
-                                   struct lustre_capa *capa)
+                                   __u32 attr)
 {
        struct osd_object       *obj  = osd_dt_obj(dt);
        struct osd_thread_info  *info = osd_oti_get(env);
-       struct osd_it_ea        *it;
+       struct osd_it_ea        *oie;
        struct file             *file;
        struct lu_object        *lo   = &dt->do_lu;
-       struct dentry           *obj_dentry = &info->oti_it_dentry;
+       struct dentry           *obj_dentry;
        ENTRY;
 
-       LASSERT(lu_object_exists(lo));
+       if (!dt_object_exists(dt) || obj->oo_destroyed)
+               RETURN(ERR_PTR(-ENOENT));
 
-       if (info->oti_it_inline) {
-               OBD_ALLOC_PTR(it);
-               if (it == NULL)
-                       RETURN(ERR_PTR(-ENOMEM));
-       } else {
-               it = &info->oti_it_ea;
-               info->oti_it_inline = 1;
-       }
+       OBD_SLAB_ALLOC_PTR_GFP(oie, osd_itea_cachep, GFP_NOFS);
+       if (oie == NULL)
+               RETURN(ERR_PTR(-ENOMEM));
+       obj_dentry = &oie->oie_dentry;
 
        obj_dentry->d_inode = obj->oo_inode;
        obj_dentry->d_sb = osd_sb(osd_obj2dev(obj));
        obj_dentry->d_name.hash = 0;
 
-       it->oie_rd_dirent       = 0;
-       it->oie_it_dirent       = 0;
-       it->oie_dirent          = NULL;
-       it->oie_buf             = info->oti_it_ea_buf;
-       it->oie_obj             = obj;
+       oie->oie_rd_dirent       = 0;
+       oie->oie_it_dirent       = 0;
+       oie->oie_dirent          = NULL;
+       if (unlikely(!info->oti_it_ea_buf_used)) {
+               oie->oie_buf = info->oti_it_ea_buf;
+               info->oti_it_ea_buf_used = 1;
+       } else {
+               OBD_ALLOC(oie->oie_buf, OSD_IT_EA_BUFSIZE);
+               if (oie->oie_buf == NULL)
+                       RETURN(ERR_PTR(-ENOMEM));
+       }
+       oie->oie_obj             = obj;
+
+       file = &oie->oie_file;
 
-       file = &it->oie_file;
-       /* Reset the "file" totally to avoid to reuse any old value from
-        * former readdir handling, the "file->f_pos" should be zero. */
-       memset(file, 0, sizeof(*file));
        /* Only FMODE_64BITHASH or FMODE_32BITHASH should be set, NOT both. */
        if (attr & LUDA_64BITHASH)
                file->f_mode    = FMODE_64BITHASH;
        else
                file->f_mode    = FMODE_32BITHASH;
-       file->f_dentry          = obj_dentry;
-       file->f_mapping         = obj->oo_inode->i_mapping;
+       file->f_path.dentry     = obj_dentry;
+       file->f_mapping         = obj->oo_inode->i_mapping;
        file->f_op              = obj->oo_inode->i_fop;
        set_file_inode(file, obj->oo_inode);
 
        lu_object_get(lo);
-       RETURN((struct dt_it *) it);
+       RETURN((struct dt_it *) oie);
 }
 
 /**
@@ -4948,18 +5422,19 @@ static struct dt_it *osd_it_ea_init(const struct lu_env *env,
  */
 static void osd_it_ea_fini(const struct lu_env *env, struct dt_it *di)
 {
-        struct osd_thread_info  *info  = osd_oti_get(env);
-        struct osd_it_ea       *it     = (struct osd_it_ea *)di;
-        struct osd_object      *obj    = it->oie_obj;
-        struct inode           *inode  = obj->oo_inode;
+       struct osd_thread_info  *info = osd_oti_get(env);
+       struct osd_it_ea        *oie    = (struct osd_it_ea *)di;
+       struct osd_object       *obj    = oie->oie_obj;
+       struct inode            *inode  = obj->oo_inode;
 
-        ENTRY;
-        it->oie_file.f_op->release(inode, &it->oie_file);
-        lu_object_put(env, &obj->oo_dt.do_lu);
-       if (it != &info->oti_it_ea)
-               OBD_FREE_PTR(it);
+       ENTRY;
+       oie->oie_file.f_op->release(inode, &oie->oie_file);
+       lu_object_put(env, &obj->oo_dt.do_lu);
+       if (unlikely(oie->oie_buf != info->oti_it_ea_buf))
+               OBD_FREE(oie->oie_buf, OSD_IT_EA_BUFSIZE);
        else
-               info->oti_it_inline = 0;
+               info->oti_it_ea_buf_used = 0;
+       OBD_SLAB_FREE_PTR(oie, osd_itea_cachep);
        EXIT;
 }
 
@@ -5012,11 +5487,17 @@ struct osd_filldir_cbs {
  * \retval 0 on success
  * \retval 1 on buffer full
  */
+#ifdef HAVE_FILLDIR_USE_CTX
+static int osd_ldiskfs_filldir(struct dir_context  *buf,
+                              const char *name, int namelen,
+#else
 static int osd_ldiskfs_filldir(void *buf, const char *name, int namelen,
+#endif
                                loff_t offset, __u64 ino,
                                unsigned d_type)
 {
-       struct osd_it_ea        *it   = ((struct osd_filldir_cbs *)buf)->it;
+       struct osd_it_ea        *it   =
+               ((struct osd_filldir_cbs *)buf)->it;
        struct osd_object       *obj  = it->oie_obj;
         struct osd_it_ea_dirent *ent  = it->oie_dirent;
         struct lu_fid           *fid  = &ent->oied_fid;
@@ -5192,63 +5673,46 @@ static int osd_it_ea_key_size(const struct lu_env *env, const struct dt_it *di)
         return it->oie_dirent->oied_namelen;
 }
 
-static int
-osd_dirent_update(handle_t *jh, struct super_block *sb,
-                 struct osd_it_ea_dirent *ent, struct lu_fid *fid,
-                 struct buffer_head *bh, struct ldiskfs_dir_entry_2 *de)
+static inline bool
+osd_dot_dotdot_has_space(struct ldiskfs_dir_entry_2 *de, int dot_dotdot)
 {
-       struct osd_fid_pack *rec;
-       int                  rc;
-       ENTRY;
-
-       LASSERT(de->file_type & LDISKFS_DIRENT_LUFID);
-       LASSERT(de->rec_len >= de->name_len + sizeof(struct osd_fid_pack));
-
-       rc = ldiskfs_journal_get_write_access(jh, bh);
-       if (rc != 0)
-               RETURN(rc);
+       LASSERTF(dot_dotdot == 1 || dot_dotdot == 2,
+                "dot_dotdot = %d\n", dot_dotdot);
 
-       rec = (struct osd_fid_pack *)(de->name + de->name_len + 1);
-       fid_cpu_to_be((struct lu_fid *)rec->fp_area, fid);
-       rc = ldiskfs_journal_dirty_metadata(jh, bh);
+       if (LDISKFS_DIR_REC_LEN(de) >=
+           __LDISKFS_DIR_REC_LEN(dot_dotdot + 1 + sizeof(struct osd_fid_pack)))
+               return true;
 
-       RETURN(rc);
+       return false;
 }
 
-static inline int
-osd_dirent_has_space(__u16 reclen, __u16 namelen, unsigned blocksize)
+static inline bool
+osd_dirent_has_space(struct ldiskfs_dir_entry_2 *de, __u16 namelen,
+                    unsigned blocksize, int dot_dotdot)
 {
-       if (ldiskfs_rec_len_from_disk(reclen, blocksize) >=
-           __LDISKFS_DIR_REC_LEN(namelen + 1 + sizeof(struct osd_fid_pack)))
-               return 1;
-       else
-               return 0;
-}
+       if (dot_dotdot > 0)
+               return osd_dot_dotdot_has_space(de, dot_dotdot);
 
-static inline int
-osd_dot_dotdot_has_space(struct ldiskfs_dir_entry_2 *de, int dot_dotdot)
-{
-       LASSERTF(dot_dotdot == 1 || dot_dotdot == 2,
-                "dot_dotdot = %d\n", dot_dotdot);
+       if (ldiskfs_rec_len_from_disk(de->rec_len, blocksize) >=
+           __LDISKFS_DIR_REC_LEN(namelen + 1 + sizeof(struct osd_fid_pack)))
+               return true;
 
-       if (LDISKFS_DIR_REC_LEN(de) >=
-           __LDISKFS_DIR_REC_LEN(dot_dotdot + 1 + sizeof(struct osd_fid_pack)))
-               return 1;
-       else
-               return 0;
+       return false;
 }
 
 static int
 osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
-                   struct inode *dir, struct inode *inode,
-                   struct osd_it_ea_dirent *ent, struct lu_fid *fid,
+                   struct dentry *dentry, const struct lu_fid *fid,
                    struct buffer_head *bh, struct ldiskfs_dir_entry_2 *de,
-                   struct htree_lock *hlock)
+                   struct htree_lock *hlock, int dot_dotdot)
 {
-       struct dentry               *dentry;
+       struct inode                *dir        = dentry->d_parent->d_inode;
+       struct inode                *inode      = dentry->d_inode;
        struct osd_fid_pack         *rec;
        struct ldiskfs_dentry_param *ldp;
+       int                          namelen    = dentry->d_name.len;
        int                          rc;
+       struct osd_thread_info     *info        = osd_oti_get(env);
        ENTRY;
 
        if (!LDISKFS_HAS_INCOMPAT_FEATURE(inode->i_sb,
@@ -5256,42 +5720,41 @@ osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
                RETURN(0);
 
        /* There is enough space to hold the FID-in-dirent. */
-       if (osd_dirent_has_space(de->rec_len, ent->oied_namelen,
-                                dir->i_sb->s_blocksize)) {
+       if (osd_dirent_has_space(de, namelen, dir->i_sb->s_blocksize,
+                                dot_dotdot)) {
                rc = ldiskfs_journal_get_write_access(jh, bh);
                if (rc != 0)
                        RETURN(rc);
 
-               de->name[de->name_len] = 0;
-               rec = (struct osd_fid_pack *)(de->name + de->name_len + 1);
+               de->name[namelen] = 0;
+               rec = (struct osd_fid_pack *)(de->name + namelen + 1);
                rec->fp_len = sizeof(struct lu_fid) + 1;
                fid_cpu_to_be((struct lu_fid *)rec->fp_area, fid);
                de->file_type |= LDISKFS_DIRENT_LUFID;
-
-               rc = ldiskfs_journal_dirty_metadata(jh, bh);
+               rc = ldiskfs_handle_dirty_metadata(jh, NULL, bh);
 
                RETURN(rc);
        }
 
+       LASSERTF(dot_dotdot == 0, "dot_dotdot = %d\n", dot_dotdot);
+
        rc = ldiskfs_delete_entry(jh, dir, de, bh);
        if (rc != 0)
                RETURN(rc);
 
-       dentry = osd_child_dentry_by_inode(env, dir, ent->oied_name,
-                                          ent->oied_namelen);
        ldp = (struct ldiskfs_dentry_param *)osd_oti_get(env)->oti_ldp;
        osd_get_ldiskfs_dirent_param(ldp, fid);
        dentry->d_fsdata = (void *)ldp;
        ll_vfs_dq_init(dir);
-       rc = osd_ldiskfs_add_entry(jh, dentry, inode, hlock);
+       rc = osd_ldiskfs_add_entry(info, jh, dentry, inode, hlock);
        /* It is too bad, we cannot reinsert the name entry back.
         * That means we lose it! */
        if (rc != 0)
                CDEBUG(D_LFSCK, "%.16s: fail to reinsert the dirent, "
                       "dir = %lu/%u, name = %.*s, "DFID": rc = %d\n",
                       LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
-                      dir->i_ino, dir->i_generation,
-                      ent->oied_namelen, ent->oied_name, PFID(fid), rc);
+                      dir->i_ino, dir->i_generation, namelen,
+                      dentry->d_name.name, PFID(fid), rc);
 
        RETURN(rc);
 }
@@ -5321,6 +5784,32 @@ osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
        bool                        dirty       = false;
        ENTRY;
 
+       osd_id_gen(id, ent->oied_ino, OSD_OII_NOGEN);
+       inode = osd_iget(info, dev, id);
+       if (IS_ERR(inode)) {
+               rc = PTR_ERR(inode);
+               if (rc == -ENOENT || rc == -ESTALE) {
+                       *attr |= LUDA_UNKNOWN;
+                       rc = 0;
+               } else {
+                       CDEBUG(D_LFSCK, "%.16s: fail to iget for dirent "
+                              "check_repair, dir = %lu/%u, name = %.*s: "
+                              "rc = %d\n",
+                              devname, dir->i_ino, dir->i_generation,
+                              ent->oied_namelen, ent->oied_name, rc);
+               }
+
+               RETURN(rc);
+       }
+
+       dentry = osd_child_dentry_by_inode(env, dir, ent->oied_name,
+                                          ent->oied_namelen);
+       rc = osd_get_lma(info, inode, dentry, lma);
+       if (rc == -ENODATA)
+               lma = NULL;
+       else if (rc != 0)
+               GOTO(out, rc);
+
        if (ent->oied_name[0] == '.') {
                if (ent->oied_namelen == 1)
                        dot_dotdot = 1;
@@ -5328,9 +5817,6 @@ osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
                        dot_dotdot = 2;
        }
 
-       dentry = osd_child_dentry_get(env, obj, ent->oied_name,
-                                     ent->oied_namelen);
-
        /* We need to ensure that the name entry is still valid.
         * Because it may be removed or renamed by other already.
         *
@@ -5347,8 +5833,9 @@ osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
        credits = osd_dto_credits_noquota[DTO_INDEX_DELETE] +
                  osd_dto_credits_noquota[DTO_INDEX_INSERT] + 1 + 1 + 2;
 
+       if (dev->od_dirent_journal != 0) {
+
 again:
-       if (dev->od_dirent_journal) {
                jh = osd_journal_start_sb(sb, LDISKFS_HT_MISC, credits);
                if (IS_ERR(jh)) {
                        rc = PTR_ERR(jh);
@@ -5357,7 +5844,8 @@ again:
                               "name = %.*s: rc = %d\n",
                               devname, dir->i_ino, dir->i_generation, credits,
                               ent->oied_namelen, ent->oied_name, rc);
-                       RETURN(rc);
+
+                       GOTO(out_inode, rc);
                }
 
                if (obj->oo_hl_head != NULL) {
@@ -5387,58 +5875,66 @@ again:
         * For the whole directory, only dot/dotdot entry have no FID-in-dirent
         * and needs to get FID from LMA when readdir, it will not affect the
         * performance much. */
-       if ((bh == NULL) || (le32_to_cpu(de->inode) != ent->oied_ino) ||
+       if (IS_ERR(bh) || (le32_to_cpu(de->inode) != inode->i_ino) ||
            (dot_dotdot != 0 && !osd_dot_dotdot_has_space(de, dot_dotdot))) {
                *attr |= LUDA_IGNORE;
-               GOTO(out_journal, rc = 0);
-       }
-
-       osd_id_gen(id, ent->oied_ino, OSD_OII_NOGEN);
-       inode = osd_iget(info, dev, id);
-       if (IS_ERR(inode)) {
-               rc = PTR_ERR(inode);
-               if (rc == -ENOENT || rc == -ESTALE)
-                       rc = 1;
-               else
-                       CDEBUG(D_LFSCK, "%.16s: fail to iget for dirent "
-                              "check_repair, dir = %lu/%u, name = %.*s: "
-                              "rc = %d\n",
-                              devname, dir->i_ino, dir->i_generation,
-                              ent->oied_namelen, ent->oied_name, rc);
 
-               GOTO(out_journal, rc);
+               GOTO(out, rc = 0);
        }
 
-       rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
-       if (rc == 0) {
-               LASSERT(!(lma->lma_compat & LMAC_NOT_IN_OI));
+       if (lma != NULL) {
+               if (unlikely(lma->lma_compat & LMAC_NOT_IN_OI)) {
+                       struct lu_fid *tfid = &lma->lma_self_fid;
+
+                       *attr |= LUDA_IGNORE;
+                       /* It must be REMOTE_PARENT_DIR and as the
+                        * dotdot entry of remote directory */
+                       if (unlikely(dot_dotdot != 2 ||
+                                    fid_seq(tfid) != FID_SEQ_LOCAL_FILE ||
+                                    fid_oid(tfid) != REMOTE_PARENT_DIR_OID)) {
+                               CDEBUG(D_LFSCK, "%.16s: expect remote agent "
+                                      "parent directory, but got %.*s under "
+                                      "dir = %lu/%u with the FID "DFID"\n",
+                                      devname, ent->oied_namelen,
+                                      ent->oied_name, dir->i_ino,
+                                      dir->i_generation, PFID(tfid));
+
+                               GOTO(out, rc = -EIO);
+                       }
+
+                       GOTO(out, rc = 0);
+               }
 
                if (fid_is_sane(fid)) {
                        /* FID-in-dirent is valid. */
                        if (lu_fid_eq(fid, &lma->lma_self_fid))
-                               GOTO(out_inode, rc = 0);
+                               GOTO(out, rc = 0);
 
                        /* Do not repair under dryrun mode. */
                        if (*attr & LUDA_VERIFY_DRYRUN) {
                                *attr |= LUDA_REPAIR;
-                               GOTO(out_inode, rc = 0);
+
+                               GOTO(out, rc = 0);
                        }
 
-                       if (!dev->od_dirent_journal) {
-                               iput(inode);
+                       if (jh == NULL) {
                                brelse(bh);
-                               if (hlock != NULL)
+                               dev->od_dirent_journal = 1;
+                               if (hlock != NULL) {
                                        ldiskfs_htree_unlock(hlock);
-                               else
+                                       hlock = NULL;
+                               } else {
                                        up_read(&obj->oo_ext_idx_sem);
-                               dev->od_dirent_journal = 1;
+                               }
+
                                goto again;
                        }
 
                        *fid = lma->lma_self_fid;
                        dirty = true;
                        /* Update the FID-in-dirent. */
-                       rc = osd_dirent_update(jh, sb, ent, fid, bh, de);
+                       rc = osd_dirent_reinsert(env, jh, dentry, fid, bh, de,
+                                                hlock, dot_dotdot);
                        if (rc == 0)
                                *attr |= LUDA_REPAIR;
                        else
@@ -5453,25 +5949,28 @@ again:
                        if (*attr & LUDA_VERIFY_DRYRUN) {
                                *fid = lma->lma_self_fid;
                                *attr |= LUDA_REPAIR;
-                               GOTO(out_inode, rc = 0);
+
+                               GOTO(out, rc = 0);
                        }
 
-                       if (!dev->od_dirent_journal) {
-                               iput(inode);
+                       if (jh == NULL) {
                                brelse(bh);
-                               if (hlock != NULL)
+                               dev->od_dirent_journal = 1;
+                               if (hlock != NULL) {
                                        ldiskfs_htree_unlock(hlock);
-                               else
+                                       hlock = NULL;
+                               } else {
                                        up_read(&obj->oo_ext_idx_sem);
-                               dev->od_dirent_journal = 1;
+                               }
+
                                goto again;
                        }
 
                        *fid = lma->lma_self_fid;
                        dirty = true;
                        /* Append the FID-in-dirent. */
-                       rc = osd_dirent_reinsert(env, jh, dir, inode, ent,
-                                                fid, bh, de, hlock);
+                       rc = osd_dirent_reinsert(env, jh, dentry, fid, bh, de,
+                                                hlock, dot_dotdot);
                        if (rc == 0)
                                *attr |= LUDA_REPAIR;
                        else
@@ -5482,7 +5981,7 @@ again:
                                       ent->oied_namelen, ent->oied_name,
                                       PFID(fid), rc);
                }
-       } else if (rc == -ENODATA) {
+       } else {
                /* Do not repair under dryrun mode. */
                if (*attr & LUDA_VERIFY_DRYRUN) {
                        if (fid_is_sane(fid)) {
@@ -5492,17 +5991,20 @@ again:
                                              inode->i_generation);
                                *attr |= LUDA_UPGRADE;
                        }
-                       GOTO(out_inode, rc = 0);
+
+                       GOTO(out, rc = 0);
                }
 
-               if (!dev->od_dirent_journal) {
-                       iput(inode);
+               if (jh == NULL) {
                        brelse(bh);
-                       if (hlock != NULL)
+                       dev->od_dirent_journal = 1;
+                       if (hlock != NULL) {
                                ldiskfs_htree_unlock(hlock);
-                       else
+                               hlock = NULL;
+                       } else {
                                up_read(&obj->oo_ext_idx_sem);
-                       dev->od_dirent_journal = 1;
+                       }
+
                        goto again;
                }
 
@@ -5524,8 +6026,8 @@ again:
                        lu_igif_build(fid, inode->i_ino, inode->i_generation);
                        /* It is probably IGIF object. Only aappend the
                         * FID-in-dirent. OI scrub will process FID-in-LMA. */
-                       rc = osd_dirent_reinsert(env, jh, dir, inode, ent,
-                                                fid, bh, de, hlock);
+                       rc = osd_dirent_reinsert(env, jh, dentry, fid, bh, de,
+                                                hlock, dot_dotdot);
                        if (rc == 0)
                                *attr |= LUDA_UPGRADE;
                        else
@@ -5538,25 +6040,28 @@ again:
                }
        }
 
-       GOTO(out_inode, rc);
-
-out_inode:
-       iput(inode);
+       GOTO(out, rc);
 
-out_journal:
-       brelse(bh);
+out:
+       if (!IS_ERR(bh))
+               brelse(bh);
        if (hlock != NULL) {
                ldiskfs_htree_unlock(hlock);
        } else {
-               if (dev->od_dirent_journal)
+               if (dev->od_dirent_journal != 0)
                        up_write(&obj->oo_ext_idx_sem);
                else
                        up_read(&obj->oo_ext_idx_sem);
        }
+
        if (jh != NULL)
                ldiskfs_journal_stop(jh);
+
+out_inode:
+       iput(inode);
        if (rc >= 0 && !dirty)
                dev->od_dirent_journal = 0;
+
        return rc;
 }
 
@@ -5593,27 +6098,40 @@ static inline int osd_it_ea_rec(const struct lu_env *env,
                        /* If the parent is on remote MDT, and there
                         * is no FID-in-dirent, then we have to get
                         * the parent FID from the linkEA.  */
-                       osd_get_pfid_from_linkea(env, obj, fid);
+                       if (!fid_is_sane(fid) &&
+                           it->oie_dirent->oied_namelen == 2 &&
+                           it->oie_dirent->oied_name[0] == '.' &&
+                           it->oie_dirent->oied_name[1] == '.')
+                               osd_get_pfid_from_linkea(env, obj, fid);
                } else {
                        rc = osd_dirent_check_repair(env, obj, it, fid, id,
                                                     &attr);
                }
+
+               if (!fid_is_sane(fid)) {
+                       attr &= ~LUDA_IGNORE;
+                       attr |= LUDA_UNKNOWN;
+               }
        } else {
                attr &= ~LU_DIRENT_ATTRS_MASK;
                if (!fid_is_sane(fid)) {
-                       if (OBD_FAIL_CHECK(OBD_FAIL_FID_LOOKUP) &&
-                           likely(it->oie_dirent->oied_namelen != 2 ||
-                                  it->oie_dirent->oied_name[0] != '.' ||
-                                  it->oie_dirent->oied_name[1] != '.'))
-                               RETURN(-ENOENT);
-
-                       if (unlikely(ino == osd_remote_parent_ino(dev)))
-                               /* If the parent is on remote MDT, and there
-                                * is no FID-in-dirent, then we have to get
-                                * the parent FID from the linkEA.  */
+                       bool is_dotdot = false;
+                       if (it->oie_dirent->oied_namelen == 2 &&
+                           it->oie_dirent->oied_name[0] == '.' &&
+                           it->oie_dirent->oied_name[1] == '.')
+                               is_dotdot = true;
+                       /* If the parent is on remote MDT, and there
+                        * is no FID-in-dirent, then we have to get
+                        * the parent FID from the linkEA.  */
+                       if (ino == osd_remote_parent_ino(dev) && is_dotdot) {
                                rc = osd_get_pfid_from_linkea(env, obj, fid);
-                       else
+                       } else {
+                               if (is_dotdot == false &&
+                                   OBD_FAIL_CHECK(OBD_FAIL_FID_LOOKUP))
+                                       RETURN(-ENOENT);
+
                                rc = osd_ea_fid_get(env, obj, ino, fid, id);
+                       }
                } else {
                        osd_id_gen(id, ino, OSD_OII_NOGEN);
                }
@@ -5631,7 +6149,7 @@ static inline int osd_it_ea_rec(const struct lu_env *env,
        if (osd_remote_fid(env, dev, fid))
                RETURN(0);
 
-       if (likely(!(attr & LUDA_IGNORE) && rc == 0))
+       if (likely(!(attr & (LUDA_IGNORE | LUDA_UNKNOWN)) && rc == 0))
                osd_add_oi_cache(oti, dev, id, fid);
 
        RETURN(rc > 0 ? 0 : rc);
@@ -5711,8 +6229,7 @@ static int osd_it_ea_load(const struct lu_env *env,
  * \retval -ve, on error
  */
 static int osd_index_ea_lookup(const struct lu_env *env, struct dt_object *dt,
-                               struct dt_rec *rec, const struct dt_key *key,
-                               struct lustre_capa *capa)
+                              struct dt_rec *rec, const struct dt_key *key)
 {
         struct osd_object *obj = osd_dt_obj(dt);
         int rc = 0;
@@ -5722,9 +6239,6 @@ static int osd_index_ea_lookup(const struct lu_env *env, struct dt_object *dt,
         LASSERT(S_ISDIR(obj->oo_inode->i_mode));
         LINVRNT(osd_invariant(obj));
 
-        if (osd_object_auth(env, dt, capa, CAPA_OPC_INDEX_LOOKUP))
-                return -EACCES;
-
         rc = osd_ea_lookup_rec(env, obj, rec, key);
         if (rc == 0)
                 rc = +1;
@@ -5788,13 +6302,23 @@ static void osd_key_fini(const struct lu_context *ctx,
                          struct lu_context_key *key, void* data)
 {
        struct osd_thread_info *info = data;
+       struct ldiskfs_inode_info *lli = LDISKFS_I(info->oti_inode);
+       struct osd_idmap_cache  *idc = info->oti_ins_cache;
 
+       if (info->oti_inode != NULL)
+               OBD_FREE_PTR(lli);
        if (info->oti_hlock != NULL)
                ldiskfs_htree_lock_free(info->oti_hlock);
        OBD_FREE(info->oti_it_ea_buf, OSD_IT_EA_BUFSIZE);
        lu_buf_free(&info->oti_iobuf.dr_pg_buf);
        lu_buf_free(&info->oti_iobuf.dr_bl_buf);
        lu_buf_free(&info->oti_big_buf);
+       if (idc != NULL) {
+               LASSERT(info->oti_ins_cache_size > 0);
+               OBD_FREE(idc, sizeof(*idc) * info->oti_ins_cache_size);
+               info->oti_ins_cache = NULL;
+               info->oti_ins_cache_size = 0;
+       }
        OBD_FREE_PTR(info);
 }
 
@@ -5848,10 +6372,18 @@ static int osd_fid_init(const struct lu_env *env, struct osd_device *osd)
 
        rc = seq_client_init(osd->od_cl_seq, NULL, LUSTRE_SEQ_METADATA,
                             osd->od_svname, ss->ss_server_seq);
-
        if (rc != 0) {
                OBD_FREE_PTR(osd->od_cl_seq);
                osd->od_cl_seq = NULL;
+               RETURN(rc);
+       }
+
+       if (ss->ss_node_id == 0) {
+               /* If the OSD on the sequence controller(MDT0), then allocate
+                * sequence here, otherwise allocate sequence after connected
+                * to MDT0 (see mdt_register_lwp_callback()). */
+               rc = seq_server_alloc_meta(osd->od_cl_seq->lcs_srv,
+                                  &osd->od_cl_seq->lcs_space, env);
        }
 
        RETURN(rc);
@@ -5911,7 +6443,7 @@ static int osd_mount(const struct lu_env *env,
        struct osd_thread_info  *info = osd_oti_get(env);
        struct lu_fid           *fid = &info->oti_fid;
        struct inode            *inode;
-       int                      rc = 0;
+       int                      rc = 0, force_over_256tb = 0;
         ENTRY;
 
        if (o->od_mnt != NULL)
@@ -5921,28 +6453,81 @@ static int osd_mount(const struct lu_env *env,
                RETURN(-E2BIG);
        strcpy(o->od_mntdev, dev);
 
-       OBD_PAGE_ALLOC(__page, GFP_IOFS);
-       if (__page == NULL)
-               GOTO(out, rc = -ENOMEM);
-
        str = lustre_cfg_string(cfg, 2);
        s_flags = simple_strtoul(str, NULL, 0);
        str = strstr(str, ":");
        if (str)
                lmd_flags = simple_strtoul(str + 1, NULL, 0);
        opts = lustre_cfg_string(cfg, 3);
+#ifdef __BIG_ENDIAN
+       if (opts == NULL || strstr(opts, "bigendian_extents") == NULL) {
+               CERROR("%s: device %s extents feature is not guaranteed to "
+                      "work on big-endian systems. Use \"bigendian_extents\" "
+                      "mount option to override.\n", name, dev);
+               RETURN(-EINVAL);
+       }
+#endif
+       if (opts != NULL && strstr(opts, "force_over_128tb") != NULL) {
+               CWARN("force_over_128tb option is depricated."
+                     "Filesystems less then 256TB can be created without any"
+                     "force options. Use force_over_256tb option for"
+                     "filesystems greather then 256TB.\n");
+       }
+
+       if (opts != NULL && strstr(opts, "force_over_256tb") != NULL)
+               force_over_256tb = 1;
+
+       __page = alloc_page(GFP_KERNEL);
+       if (__page == NULL)
+               GOTO(out, rc = -ENOMEM);
        page = (unsigned long)page_address(__page);
        options = (char *)page;
        *options = '\0';
-       if (opts == NULL)
-               strcat(options, "user_xattr,acl");
-       else
+       if (opts != NULL) {
+               /* strip out the options for back compatiblity */
+               static char *sout[] = {
+                       "mballoc",
+                       "iopen",
+                       "noiopen",
+                       "iopen_nopriv",
+                       "extents",
+                       "noextents",
+                       /* strip out option we processed in osd */
+                       "bigendian_extents",
+#if LUSTRE_VERSION_CODE >= OBD_OCD_VERSION(3,0,53,0)
+#warning "remove force_over_128 option"
+#else
+                       "force_over_128tb (deprecated)",
+#endif
+                       "force_over_256tb",
+                       NULL
+               };
                strcat(options, opts);
+               for (rc = 0, str = options; sout[rc]; ) {
+                       char *op = strstr(str, sout[rc]);
+                       if (op == NULL) {
+                               rc++;
+                               str = options;
+                               continue;
+                       }
+                       if (op == options || *(op - 1) == ',') {
+                               str = op + strlen(sout[rc]);
+                               if (*str == ',' || *str == '\0') {
+                                       *str == ',' ? str++ : str;
+                                       memmove(op, str, strlen(str) + 1);
+                               }
+                       }
+                       for (str = op; *str != ',' && *str != '\0'; str++)
+                               ;
+               }
+       } else {
+               strncat(options, "user_xattr,acl", 14);
+       }
 
        /* Glom up mount options */
        if (*options != '\0')
                strcat(options, ",");
-       strlcat(options, "no_mbcache", PAGE_CACHE_SIZE);
+       strlcat(options, "no_mbcache", PAGE_SIZE);
 
        type = get_fs_type("ldiskfs");
        if (!type) {
@@ -5960,6 +6545,15 @@ static int osd_mount(const struct lu_env *env,
                GOTO(out, rc);
        }
 
+       if (ldiskfs_blocks_count(LDISKFS_SB(osd_sb(o))->s_es) > (64ULL << 30) &&
+           force_over_256tb == 0) {
+               CERROR("%s: device %s LDISKFS does not support filesystems "
+                      "greater than 256TB and can cause data corruption. "
+                      "Use \"force_over_256tb\" mount option to override.\n",
+                      name, dev);
+               GOTO(out, rc = -EINVAL);
+       }
+
 #ifdef HAVE_DEV_SET_RDONLY
        if (dev_check_rdonly(o->od_mnt->mnt_sb->s_bdev)) {
                CERROR("%s: underlying device %s is marked as read-only. "
@@ -6003,7 +6597,7 @@ out_mnt:
 
 out:
        if (__page)
-               OBD_PAGE_FREE(__page);
+               __free_page(__page);
 
        return rc;
 }
@@ -6044,10 +6638,7 @@ static int osd_device_init0(const struct lu_env *env,
 
        spin_lock_init(&o->od_osfs_lock);
        mutex_init(&o->od_otable_mutex);
-
-       o->od_capa_hash = init_capa_hash();
-       if (o->od_capa_hash == NULL)
-               GOTO(out, rc = -ENOMEM);
+       INIT_LIST_HEAD(&o->od_orphan_list);
 
        o->od_read_cache = 1;
        o->od_writethrough_cache = 1;
@@ -6057,17 +6648,19 @@ static int osd_device_init0(const struct lu_env *env,
                        sizeof(o->od_svname));
        if (cplen >= sizeof(o->od_svname)) {
                rc = -E2BIG;
-               GOTO(out_capa, rc);
+               GOTO(out, rc);
        }
 
-       if (server_name_is_ost(o->od_svname))
+       o->od_index = -1; /* -1 means index is invalid */
+       rc = server_name2index(o->od_svname, &o->od_index, NULL);
+       if (rc == LDD_F_SV_TYPE_OST)
                o->od_is_ost = 1;
 
        o->od_full_scrub_ratio = OFSR_DEFAULT;
-       o->od_full_scrub_speed = FULL_SCRUB_SPEED_DEFULT;
+       o->od_full_scrub_threshold_rate = FULL_SCRUB_THRESHOLD_RATE_DEFAULT;
        rc = osd_mount(env, o, cfg);
        if (rc != 0)
-               GOTO(out_capa, rc);
+               GOTO(out, rc);
 
        rc = osd_obj_map_init(env, o);
        if (rc != 0)
@@ -6082,9 +6675,6 @@ static int osd_device_init0(const struct lu_env *env,
        if (rc != 0)
                GOTO(out_site, rc);
 
-       /* self-repair LMA by default */
-       o->od_lma_self_repair = 1;
-
        INIT_LIST_HEAD(&o->od_ios_list);
        /* setup scrub, including OI files initialization */
        rc = osd_scrub_setup(env, o);
@@ -6122,8 +6712,6 @@ out_compat:
        osd_obj_map_fini(o);
 out_mnt:
        osd_umount(env, o);
-out_capa:
-       cleanup_capa_hash(o->od_capa_hash);
 out:
        return rc;
 }
@@ -6161,7 +6749,6 @@ static struct lu_device *osd_device_free(const struct lu_env *env,
         struct osd_device *o = osd_dev(d);
         ENTRY;
 
-        cleanup_capa_hash(o->od_capa_hash);
        /* XXX: make osd top device in order to release reference */
        d->ld_site->ls_top_dev = d;
        lu_site_purge(env, d->ld_site, -1);
@@ -6275,10 +6862,12 @@ static int osd_obd_disconnect(struct obd_export *exp)
 }
 
 static int osd_prepare(const struct lu_env *env, struct lu_device *pdev,
-                       struct lu_device *dev)
+                      struct lu_device *dev)
 {
-       struct osd_device *osd = osd_dev(dev);
-       int                result = 0;
+       struct osd_device       *osd    = osd_dev(dev);
+       struct lr_server_data   *lsd    =
+                       &osd->od_dt_dev.dd_lu_dev.ld_site->ls_tgt->lut_lsd;
+       int                      result = 0;
        ENTRY;
 
        if (osd->od_quota_slave != NULL) {
@@ -6288,6 +6877,21 @@ static int osd_prepare(const struct lu_env *env, struct lu_device *pdev,
                        RETURN(result);
        }
 
+       if (lsd->lsd_feature_incompat & OBD_COMPAT_OST) {
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 52, 0)
+               if (lsd->lsd_feature_rocompat & OBD_ROCOMPAT_IDX_IN_IDIF) {
+                       osd->od_index_in_idif = 1;
+               } else {
+                       osd->od_index_in_idif = 0;
+                       result = osd_register_proc_index_in_idif(osd);
+                       if (result != 0)
+                               RETURN(result);
+               }
+#else
+               osd->od_index_in_idif = 1;
+#endif
+       }
+
        result = osd_fid_init(env, osd);
 
        RETURN(result);
@@ -6338,6 +6942,14 @@ static struct lu_device_type osd_device_type = {
         .ldt_ctx_tags = LCT_LOCAL,
 };
 
+static int osd_health_check(const struct lu_env *env, struct obd_device *obd)
+{
+       struct osd_device *osd = osd_dev(obd->obd_lu_dev);
+       struct super_block *sb = osd_sb(osd);
+
+       return (osd->od_mnt == NULL || sb->s_flags & MS_RDONLY);
+}
+
 /*
  * lprocfs legacy support.
  */
@@ -6346,12 +6958,19 @@ static struct obd_ops osd_obd_device_ops = {
        .o_connect      = osd_obd_connect,
        .o_disconnect   = osd_obd_disconnect,
        .o_fid_alloc    = osd_fid_alloc,
+       .o_health_check = osd_health_check,
 };
 
-static int __init osd_mod_init(void)
+static int __init osd_init(void)
 {
        int rc;
 
+       LASSERT(BH_DXLock < sizeof(((struct buffer_head *)0)->b_state) * 8);
+#if !defined(CONFIG_DEBUG_MUTEXES) && !defined(CONFIG_DEBUG_SPINLOCK)
+       /* please, try to keep osd_thread_info smaller than a page */
+       CLASSERT(sizeof(struct osd_thread_info) <= PAGE_SIZE);
+#endif
+
        osd_oi_mod_init();
 
        rc = lu_kmem_init(ldiskfs_caches);
@@ -6366,14 +6985,16 @@ static int __init osd_mod_init(void)
        return rc;
 }
 
-static void __exit osd_mod_exit(void)
+static void __exit osd_exit(void)
 {
        class_unregister_type(LUSTRE_OSD_LDISKFS_NAME);
        lu_kmem_fini(ldiskfs_caches);
 }
 
-MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
+MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 MODULE_DESCRIPTION("Lustre Object Storage Device ("LUSTRE_OSD_LDISKFS_NAME")");
+MODULE_VERSION(LUSTRE_VERSION_STRING);
 MODULE_LICENSE("GPL");
 
-cfs_module(osd, "0.1.0", osd_mod_init, osd_mod_exit);
+module_init(osd_init);
+module_exit(osd_exit);