Whamcloud - gitweb
LU-4017 quota: add project inherit attributes
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_handler.c
index 0369122..2876e6e 100644 (file)
  *
  * You should have received a copy of the GNU General Public License
  * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * GPL HEADER END
  */
@@ -27,7 +23,7 @@
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2015, Intel Corporation.
+ * Copyright (c) 2011, 2016, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -60,6 +56,7 @@
 
 #include <ldiskfs/ldiskfs.h>
 #include <ldiskfs/xattr.h>
+#include <ldiskfs/ldiskfs_extents.h>
 #undef ENTRY
 /*
  * struct OBD_{ALLOC,FREE}*()
 
 #include <lustre_linkea.h>
 
+#define PFID_STRIPE_IDX_BITS   16
+#define PFID_STRIPE_COUNT_MASK ((1 << PFID_STRIPE_IDX_BITS) - 1)
+
 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;
@@ -175,6 +175,153 @@ 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.
  */
 
@@ -199,6 +346,7 @@ 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;
@@ -206,18 +354,20 @@ static struct lu_object *osd_object_alloc(const struct lu_env *env,
 }
 
 int osd_get_lma(struct osd_thread_info *info, struct inode *inode,
-               struct dentry *dentry, struct lustre_mdt_attrs *lma)
+               struct dentry *dentry, struct lustre_ost_attrs *loa)
 {
        int rc;
 
-       CLASSERT(LMA_OLD_SIZE >= sizeof(*lma));
        rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMA,
-                            info->oti_mdt_attrs_old, LMA_OLD_SIZE);
+                            (void *)loa, sizeof(*loa));
        if (rc > 0) {
-               if ((void *)lma != (void *)info->oti_mdt_attrs_old)
-                       memcpy(lma, info->oti_mdt_attrs_old, sizeof(*lma));
+               struct lustre_mdt_attrs *lma = &loa->loa_lma;
+
+               if (rc < sizeof(*lma))
+                       return -EINVAL;
+
                rc = 0;
-               lustre_lma_swab(lma);
+               lustre_loa_swab(loa, true);
                /* Check LMA compatibility */
                if (lma->lma_incompat & ~LMA_INCOMPAT_SUPP) {
                        CWARN("%.16s: unsupported incompat LMA feature(s) %#x "
@@ -240,6 +390,7 @@ int osd_get_lma(struct osd_thread_info *info, struct inode *inode,
 struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
                       struct osd_inode_id *id)
 {
+       int rc;
        struct inode *inode = NULL;
 
        /* if we look for an inode withing a running
@@ -269,6 +420,9 @@ struct inode *osd_iget(struct osd_thread_info *info, struct osd_device *dev,
                LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name, id->oii_ino);
                iput(inode);
                inode = ERR_PTR(-ENOENT);
+       } else if ((rc = osd_attach_jinode(inode))) {
+               iput(inode);
+               inode = ERR_PTR(rc);
        } else {
                ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);
                if (id->oii_gen == OSD_OII_NOGEN)
@@ -285,21 +439,67 @@ 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, struct osd_device *osd,
+                         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) {
+               struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
+               struct inode *parent = child->d_parent->d_inode;
+               struct lu_fid *fid = NULL;
+
+               rc2 = osd_get_lma(info, parent, child->d_parent, loa);
+               if (!rc2) {
+                       fid = &loa->loa_lma.lma_self_fid;
+               } else if (rc2 == -ENODATA) {
+                       if (unlikely(parent == inode->i_sb->s_root->d_inode)) {
+                               fid = &info->oti_fid3;
+                               lu_local_obj_fid(fid, OSD_FS_ROOT_OID);
+                       } else if (!osd->od_is_ost && osd->od_index == 0) {
+                               fid = &info->oti_fid3;
+                               lu_igif_build(fid, parent->i_ino,
+                                             parent->i_generation);
+                       }
+               }
+
+               if (fid != NULL)
+                       CWARN("%s: directory (inode: %lu, FID: "DFID") %s "
+                             "maximum entry limit\n",
+                             osd_name(osd), parent->i_ino, PFID(fid),
+                             rc == -ENOSPC ? "has reached" : "is approaching");
+               else
+                       CWARN("%s: directory (inode: %lu, FID: unknown) %s "
+                             "maximum entry limit\n",
+                             osd_name(osd), parent->i_ino,
+                             rc == -ENOSPC ? "has reached" : "is approaching");
+
+               /* 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)
 {
-       struct lustre_mdt_attrs *lma   = &info->oti_mdt_attrs;
-       struct inode            *inode;
-       int                      rc;
+       struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
+       struct inode *inode;
+       int rc;
 
        inode = osd_iget(info, dev, id);
        if (IS_ERR(inode))
                return inode;
 
-       rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
-       if (rc == 0) {
-               *fid = lma->lma_self_fid;
+       rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
+       if (!rc) {
+               *fid = loa->loa_lma.lma_self_fid;
        } else if (rc == -ENODATA) {
                if (unlikely(inode == osd_sb(dev)->s_root->d_inode))
                        lu_local_obj_fid(fid, OSD_FS_ROOT_OID);
@@ -316,69 +516,68 @@ 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 cached)
+                                   bool trusted)
 {
-       struct inode    *inode;
-       int              rc     = 0;
+       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. */
 
+again:
        inode = ldiskfs_iget(osd_sb(dev), id->oii_ino);
        if (IS_ERR(inode)) {
                rc = PTR_ERR(inode);
-               if (cached || (rc != -ENOENT && rc != -ESTALE)) {
-                       CDEBUG(D_INODE, "no inode: ino = %u, rc = %d\n",
-                              id->oii_ino, rc);
-
-                       GOTO(put, rc);
-               }
+               if (!trusted && (rc == -ENOENT || rc == -ESTALE))
+                       goto check_oi;
 
-               goto check_oi;
+               CDEBUG(D_INODE, "no inode for FID: "DFID", ino = %u, rc = %d\n",
+                      PFID(fid), id->oii_ino, rc);
+               GOTO(put, rc);
        }
 
        if (is_bad_inode(inode)) {
                rc = -ENOENT;
-               if (cached) {
-                       CDEBUG(D_INODE, "bad inode: ino = %u\n", id->oii_ino);
+               if (!trusted)
+                       goto check_oi;
 
-                       GOTO(put, rc);
-               }
-
-               goto check_oi;
+               CDEBUG(D_INODE, "bad inode for FID: "DFID", ino = %u\n",
+                      PFID(fid), id->oii_ino);
+               GOTO(put, rc);
        }
 
        if (id->oii_gen != OSD_OII_NOGEN &&
            inode->i_generation != id->oii_gen) {
                rc = -ESTALE;
-               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);
+               if (!trusted)
+                       goto check_oi;
 
-                       GOTO(put, rc);
-               }
-
-               goto check_oi;
+               CDEBUG(D_INODE, "unmatched inode for FID: "DFID", ino = %u, "
+                      "oii_gen = %u, i_generation = %u\n", PFID(fid),
+                      id->oii_ino, id->oii_gen, inode->i_generation);
+               GOTO(put, rc);
        }
 
        if (inode->i_nlink == 0) {
                rc = -ENOENT;
-               if (cached) {
-                       CDEBUG(D_INODE, "stale inode: ino = %u\n", id->oii_ino);
-
-                       GOTO(put, rc);
-               }
+               if (!trusted)
+                       goto check_oi;
 
-               goto check_oi;
+               CDEBUG(D_INODE, "stale inode for FID: "DFID", ino = %u\n",
+                      PFID(fid), id->oii_ino);
+               GOTO(put, rc);
        }
 
        ldiskfs_clear_inode_state(inode, LDISKFS_STATE_LUSTRE_DESTROY);
 
 check_oi:
        if (rc != 0) {
+               __u32 saved_ino = id->oii_ino;
+               __u32 saved_gen = id->oii_gen;
+
+               LASSERT(!trusted);
                LASSERTF(rc == -ESTALE || rc == -ENOENT, "rc = %d\n", rc);
 
                rc = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
@@ -397,21 +596,42 @@ check_oi:
                 *      Generally, when the device is mounted, it will
                 *      auto check whether the system is restored from
                 *      file-level backup or not. We trust such detect
-                *      to distinguish the 1st case from the 2nd case. */
-               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 {
+                *      to distinguish the 1st case from the 2nd case:
+                *      if the OI files are consistent but may contain
+                *      stale OI mappings because of case 2, if iget()
+                *      returns -ENOENT or -ESTALE, then it should be
+                *      the case 2. */
+               if (rc != 0)
                        /* 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. */
+                       GOTO(put, rc);
+
+               /* It is the OI scrub updated the OI mapping by race.
+                * The new OI mapping must be valid. */
+               if (saved_ino != id->oii_ino || saved_gen != id->oii_gen) {
+                       trusted = true;
+                       goto again;
+               }
+
+               if (IS_ERR(inode)) {
+                       if (dev->od_scrub.os_file.sf_flags & SF_INCONSISTENT)
+                               /* It still can be the case 2, but we cannot
+                                * distinguish it from the case 1. So return
+                                * -EREMCHG to block current operation until
+                                *  OI scrub rebuilt the OI mappings. */
+                               rc = -EREMCHG;
+                       else
+                               rc = -ENOENT;
+
+                       GOTO(put, rc);
                }
+
+               if (inode->i_generation == id->oii_gen)
+                       rc = -ENOENT;
+               else
+                       rc = -EREMCHG;
        } else {
                if (id->oii_gen == OSD_OII_NOGEN)
                        osd_id_gen(id, inode->i_ino, inode->i_generation);
@@ -454,10 +674,13 @@ int osd_get_idif(struct osd_thread_info *info, struct inode *inode,
        if (rc == sizeof(*ff)) {
                rc = 0;
                ostid_set_seq(ostid, le64_to_cpu(ff->ff_seq));
-               ostid_set_id(ostid, le64_to_cpu(ff->ff_objid));
-               /* XXX: use 0 as the index for compatibility, the caller will
-                *      handle index related issues when necessarry. */
-               ostid_to_fid(fid, ostid, 0);
+               rc = ostid_set_id(ostid, le64_to_cpu(ff->ff_objid));
+               /*
+                * XXX: use 0 as the index for compatibility, the caller will
+                *      handle index related issues when necessary.
+                */
+               if (!rc)
+                       ostid_to_fid(fid, ostid, 0);
        } else if (rc == sizeof(struct filter_fid)) {
                rc = 1;
        } else if (rc >= 0) {
@@ -497,7 +720,8 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
 {
        struct osd_thread_info  *info   = osd_oti_get(env);
        struct osd_device       *osd    = osd_obj2dev(obj);
-       struct lustre_mdt_attrs *lma    = &info->oti_mdt_attrs;
+       struct lustre_ost_attrs *loa    = &info->oti_ost_attrs;
+       struct lustre_mdt_attrs *lma    = &loa->loa_lma;
        struct inode            *inode  = obj->oo_inode;
        struct dentry           *dentry = &info->oti_obj_dentry;
        struct lu_fid           *fid    = NULL;
@@ -505,9 +729,8 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
        int                      rc;
        ENTRY;
 
-       CLASSERT(LMA_OLD_SIZE >= sizeof(*lma));
        rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMA,
-                            info->oti_mdt_attrs_old, LMA_OLD_SIZE);
+                            (void *)loa, sizeof(*loa));
        if (rc == -ENODATA && !fid_is_igif(rfid) && osd->od_check_ff) {
                fid = &lma->lma_self_fid;
                rc = osd_get_idif(info, inode, dentry, fid);
@@ -530,7 +753,8 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
                rc = 0;
                lustre_lma_swab(lma);
                if (unlikely((lma->lma_incompat & ~LMA_INCOMPAT_SUPP) ||
-                            CFS_FAIL_CHECK(OBD_FAIL_OSD_LMA_INCOMPAT))) {
+                            (CFS_FAIL_CHECK(OBD_FAIL_OSD_LMA_INCOMPAT) &&
+                             S_ISREG(inode->i_mode)))) {
                        CWARN("%s: unsupported incompat LMA feature(s) %#x for "
                              "fid = "DFID", ino = %lu\n", osd_name(osd),
                              lma->lma_incompat & ~LMA_INCOMPAT_SUPP,
@@ -571,22 +795,205 @@ static int osd_check_lma(const struct lu_env *env, struct osd_object *obj)
        RETURN(rc);
 }
 
+struct osd_check_lmv_buf {
+#ifdef HAVE_DIR_CONTEXT
+       /* please keep it as first member */
+       struct dir_context       ctx;
+#endif
+       struct osd_thread_info  *oclb_info;
+       struct osd_device       *oclb_dev;
+       struct osd_idmap_cache  *oclb_oic;
+};
+
+/**
+ * It is called internally by ->readdir() to filter out the
+ * local slave object's FID of the striped directory.
+ *
+ * \retval     1 found the local slave's FID
+ * \retval     0 continue to check next item
+ * \retval     -ve for failure
+ */
+#ifdef HAVE_FILLDIR_USE_CTX
+static int osd_stripe_dir_filldir(struct dir_context *buf,
+#else
+static int osd_stripe_dir_filldir(void *buf,
+#endif
+                                 const char *name, int namelen,
+                                 loff_t offset, __u64 ino, unsigned d_type)
+{
+       struct osd_check_lmv_buf *oclb = (struct osd_check_lmv_buf *)buf;
+       struct osd_thread_info *oti = oclb->oclb_info;
+       struct lu_fid *fid = &oti->oti_fid3;
+       struct osd_inode_id *id = &oti->oti_id3;
+       struct osd_device *dev = oclb->oclb_dev;
+       struct osd_idmap_cache *oic = oclb->oclb_oic;
+       struct inode *inode;
+       int rc;
+
+       if (name[0] == '.')
+               return 0;
+
+       fid_zero(fid);
+       sscanf(name + 1, SFID, RFID(fid));
+       if (!fid_is_sane(fid))
+               return 0;
+
+       if (osd_remote_fid(oti->oti_env, dev, fid))
+               return 0;
+
+       osd_id_gen(id, ino, OSD_OII_NOGEN);
+       inode = osd_iget(oti, dev, id);
+       if (IS_ERR(inode))
+               return PTR_ERR(inode);
+
+       iput(inode);
+       osd_add_oi_cache(oti, dev, id, fid);
+       oic->oic_fid = *fid;
+       oic->oic_lid = *id;
+       oic->oic_dev = dev;
+       rc = osd_oii_insert(dev, oic, true);
+
+       return rc == 0 ? 1 : rc;
+}
+
+/* When lookup item under striped directory, we need to locate the master
+ * MDT-object of the striped directory firstly, then the client will send
+ * lookup (getattr_by_name) RPC to the MDT with some slave MDT-object's FID
+ * and the item's name. If the system is restored from MDT file level backup,
+ * then before the OI scrub completely built the OI files, the OI mappings of
+ * the master MDT-object and slave MDT-object may be invalid. Usually, it is
+ * not a problem for the master MDT-object. Because when locate the master
+ * MDT-object, we will do name based lookup (for the striped directory itself)
+ * firstly, during such process we can setup the correct OI mapping for the
+ * master MDT-object. But it will be trouble for the slave MDT-object. Because
+ * the client will not trigger name based lookup on the MDT to locate the slave
+ * MDT-object before locating item under the striped directory, then when
+ * osd_fid_lookup(), it will find that the OI mapping for the slave MDT-object
+ * is invalid and does not know what the right OI mapping is, then the MDT has
+ * to return -EINPROGRESS to the client to notify that the OI scrub is rebuiding
+ * the OI file, related OI mapping is unknown yet, please try again later. And
+ * then client will re-try the RPC again and again until related OI mapping has
+ * been updated. That is quite inefficient.
+ *
+ * To resolve above trouble, we will handle it as the following two cases:
+ *
+ * 1) The slave MDT-object and the master MDT-object are on different MDTs.
+ *    It is relative easy. Be as one of remote MDT-objects, the slave MDT-object
+ *    is linked under /REMOTE_PARENT_DIR with the name of its FID string.
+ *    We can locate the slave MDT-object via lookup the /REMOTE_PARENT_DIR
+ *    directly. Please check osd_fid_lookup().
+ *
+ * 2) The slave MDT-object and the master MDT-object reside on the same MDT.
+ *    Under such case, during lookup the master MDT-object, we will lookup the
+ *    slave MDT-object via readdir against the master MDT-object, because the
+ *    slave MDT-objects information are stored as sub-directories with the name
+ *    "${FID}:${index}". Then when find the local slave MDT-object, its OI
+ *    mapping will be recorded. Then subsequent osd_fid_lookup() will know
+ *    the correct OI mapping for the slave MDT-object. */
+static int osd_check_lmv(struct osd_thread_info *oti, struct osd_device *dev,
+                        struct inode *inode, struct osd_idmap_cache *oic)
+{
+       struct lu_buf *buf = &oti->oti_big_buf;
+       struct dentry *dentry = &oti->oti_obj_dentry;
+       struct file *filp = &oti->oti_file;
+       const struct file_operations *fops;
+       struct lmv_mds_md_v1 *lmv1;
+       struct osd_check_lmv_buf oclb = {
+#ifdef HAVE_DIR_CONTEXT
+               .ctx.actor = osd_stripe_dir_filldir,
+#endif
+               .oclb_info = oti,
+               .oclb_dev = dev,
+               .oclb_oic = oic
+       };
+       int rc = 0;
+       ENTRY;
+
+again:
+       rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMV, buf->lb_buf,
+                            buf->lb_len);
+       if (rc == -ERANGE) {
+               rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMV, NULL, 0);
+               if (rc > 0) {
+                       lu_buf_realloc(buf, rc);
+                       if (buf->lb_buf == NULL)
+                               GOTO(out, rc = -ENOMEM);
+
+                       goto again;
+               }
+       }
+
+       if (unlikely(rc == 0 || rc == -ENODATA))
+               GOTO(out, rc = 0);
+
+       if (rc < 0)
+               GOTO(out, rc);
+
+       if (unlikely(buf->lb_buf == NULL)) {
+               lu_buf_realloc(buf, rc);
+               if (buf->lb_buf == NULL)
+                       GOTO(out, rc = -ENOMEM);
+
+               goto again;
+       }
+
+       lmv1 = buf->lb_buf;
+       if (le32_to_cpu(lmv1->lmv_magic) != LMV_MAGIC_V1)
+               GOTO(out, rc = 0);
+
+       fops = inode->i_fop;
+       dentry->d_inode = inode;
+       dentry->d_sb = inode->i_sb;
+       filp->f_pos = 0;
+       filp->f_path.dentry = dentry;
+       filp->f_mode = FMODE_64BITHASH;
+       filp->f_mapping = inode->i_mapping;
+       filp->f_op = fops;
+       filp->private_data = NULL;
+       set_file_inode(filp, inode);
+
+#ifdef HAVE_DIR_CONTEXT
+       oclb.ctx.pos = filp->f_pos;
+       rc = fops->iterate(filp, &oclb.ctx);
+       filp->f_pos = oclb.ctx.pos;
+#else
+       rc = fops->readdir(filp, &oclb, osd_stripe_dir_filldir);
+#endif
+       fops->release(inode, filp);
+
+out:
+       if (rc < 0)
+               CDEBUG(D_LFSCK, "%.16s: fail to check LMV EA, inode = %lu/%u,"
+                      DFID": rc = %d\n",
+                      LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
+                      inode->i_ino, inode->i_generation,
+                      PFID(&oic->oic_fid), rc);
+       else
+               rc = 0;
+
+       RETURN(rc);
+}
+
 static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
                          const struct lu_fid *fid,
                          const struct lu_object_conf *conf)
 {
        struct osd_thread_info *info;
-       struct lu_device       *ldev   = obj->oo_dt.do_lu.lo_dev;
-       struct osd_device      *dev;
+       struct lu_device *ldev = obj->oo_dt.do_lu.lo_dev;
+       struct osd_device *dev;
        struct osd_idmap_cache *oic;
-       struct osd_inode_id    *id;
-       struct inode           *inode;
-       struct osd_scrub       *scrub;
-       struct scrub_file      *sf;
-       int                     result;
-       int                     saved  = 0;
-       bool                    cached  = true;
-       bool                    triggered = false;
+       struct osd_inode_id *id;
+       struct inode *inode = NULL;
+       struct osd_scrub *scrub;
+       struct scrub_file *sf;
+       __u32 flags = SS_CLEAR_DRYRUN | SS_CLEAR_FAILOUT | SS_AUTO_FULL;
+       __u32 saved_ino;
+       __u32 saved_gen;
+       int result = 0;
+       int rc1 = 0;
+       bool remote = false;
+       bool trusted = true;
+       bool updated = false;
        ENTRY;
 
        LINVRNT(osd_invariant(obj));
@@ -600,7 +1007,7 @@ 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
@@ -626,7 +1033,10 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
                        goto iget;
        }
 
-       cached = false;
+       /* The OI mapping in the OI file can be updated by the OI scrub
+        * when we locate the inode via FID. So it may be not trustable. */
+       trusted = false;
+
        /* Search order: 3. OI files. */
        result = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
        if (result == -ENOENT) {
@@ -643,36 +1053,15 @@ static int osd_fid_lookup(const struct lu_env *env, struct osd_object *obj,
                GOTO(out, result);
 
 iget:
-       inode = osd_iget_check(info, dev, fid, id, cached);
+       inode = osd_iget_check(info, dev, fid, id, trusted);
        if (IS_ERR(inode)) {
                result = PTR_ERR(inode);
                if (result == -ENOENT || result == -ESTALE)
-                       GOTO(out, result = -ENOENT);
+                       GOTO(out, result = 0);
 
                if (result == -EREMCHG) {
 
 trigger:
-                       if (unlikely(triggered))
-                               GOTO(out, result = saved);
-
-                       triggered = true;
-                       if (thread_is_running(&scrub->os_thread)) {
-                               result = -EINPROGRESS;
-                       } else if (!dev->od_noscrub) {
-                               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 (fid_is_on_ost(info, dev, fid, OI_CHECK_FLD))
-                               GOTO(out, result);
-
                        /* 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
@@ -688,85 +1077,163 @@ 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) {
-                               cached = true;
-                               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;
+                                       trusted = 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));
 
        result = osd_check_lma(env, obj);
-       if (result != 0) {
-               if (result == -ENODATA) {
-                       if (cached) {
-                               result = osd_oi_lookup(info, dev, fid, id,
-                                                      OI_CHECK_FLD);
-                               if (result != 0) {
-                                       /* 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. */
-                       }
+       if (result == 0)
+               goto found;
+
+       LASSERTF(id->oii_ino == inode->i_ino &&
+                id->oii_gen == inode->i_generation,
+                "locate wrong inode for FID: "DFID", %u/%u => %ld/%u\n",
+                PFID(fid), id->oii_ino, id->oii_gen,
+                inode->i_ino, inode->i_generation);
+
+       saved_ino = inode->i_ino;
+       saved_gen = inode->i_generation;
 
+       if (unlikely(result == -ENODATA)) {
+               /* If the OI scrub updated the OI mapping by race, it
+                * must be valid. Trust the inode that has no LMA EA. */
+               if (updated)
                        goto found;
-               }
 
-               iput(inode);
-               obj->oo_inode = NULL;
-               if (result != -EREMCHG)
-                       GOTO(out, result);
+               result = osd_oi_lookup(info, dev, fid, id, OI_CHECK_FLD);
+               if (result == 0) {
+                       /* The OI mapping is still there, the inode is still
+                        * valid. It is just becaues the inode has no LMA EA. */
+                       if (saved_ino == id->oii_ino &&
+                           saved_gen == id->oii_gen)
+                               goto found;
 
-               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);
+                       /* It is the OI scrub updated the OI mapping by race.
+                        * The new OI mapping must be valid. */
+                       iput(inode);
+                       inode = NULL;
+                       obj->oo_inode = NULL;
+                       trusted = true;
+                       updated = true;
+                       goto iget;
+               }
 
-                       /* 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. */
+               /* "result == -ENOENT" means that the OI mappinghas been
+                * removed by race, so the inode belongs to other object.
+                *
+                * Others error can be returned  directly. */
+               if (result == -ENOENT) {
+                       LASSERT(trusted);
+
+                       result = 0;
                }
+       }
 
-               goto trigger;
+       iput(inode);
+       inode = NULL;
+       obj->oo_inode = NULL;
+
+       if (result != -EREMCHG)
+               GOTO(out, result);
+
+       LASSERT(!updated);
+
+       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 inode belongs to other object. */
+       if (result == -ENOENT) {
+               LASSERT(trusted);
+
+               GOTO(out, result = 0);
        }
 
+       if (result != 0)
+               GOTO(out, result);
+
+       if (saved_ino == id->oii_ino && saved_gen == id->oii_gen)
+               goto trigger;
+
+       /* It is the OI scrub updated the OI mapping by race.
+        * The new OI mapping must be valid. */
+       trusted = true;
+       updated = true;
+       goto iget;
+
 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) &&
+           (flags & SS_AUTO_PARTIAL || sf->sf_status == SS_SCANNING))
+               osd_check_lmv(info, dev, inode, oic);
+
+       result = osd_attach_jinode(inode);
+       if (result) {
+               obj->oo_inode = NULL;
+               iput(inode);
+               GOTO(out, result);
+       }
+
+       if (!ldiskfs_pdo)
                GOTO(out, result = 0);
 
        LASSERT(obj->oo_hl_head == NULL);
@@ -779,7 +1246,7 @@ found:
        GOTO(out, result = 0);
 
 out:
-       if (result != 0 && cached)
+       if (result != 0 && trusted)
                fid_zero(&oic->oic_fid);
 
        LINVRNT(osd_invariant(obj));
@@ -817,13 +1284,158 @@ 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_ost_attrs *loa = &oti->oti_ost_attrs;
+
                osd_object_init0(obj);
+               result = osd_get_lma(oti, obj->oo_inode,
+                                    &oti->oti_obj_dentry, loa);
+               if (!result) {
+                       /* Convert LMAI flags to lustre LMA flags
+                        * and cache it to oo_lma_flags */
+                       obj->oo_lma_flags =
+                               lma_to_lustre_flags(loa->loa_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 int osd_oxc_get(struct osd_object *obj, const char *name,
+                      struct lu_buf *buf)
+{
+       struct osd_xattr_entry *tmp;
+       struct osd_xattr_entry *oxe = NULL;
+       size_t namelen = strlen(name);
+       int rc;
+       ENTRY;
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(tmp, &obj->oo_xattr_list, oxe_list) {
+               if (namelen == tmp->oxe_namelen &&
+                   strncmp(name, tmp->oxe_buf, namelen) == 0) {
+                       oxe = tmp;
+                       break;
+               }
+       }
+
+       if (oxe == NULL)
+               GOTO(out, rc = -ENOENT);
+
+       if (!oxe->oxe_exist)
+               GOTO(out, rc = -ENODATA);
+
+       /* vallen */
+       rc = oxe->oxe_len - sizeof(*oxe) - oxe->oxe_namelen - 1;
+       LASSERT(rc > 0);
+
+       if (buf->lb_buf == NULL)
+               GOTO(out, rc);
+
+       if (buf->lb_len < rc)
+               GOTO(out, rc = -ERANGE);
+
+       memcpy(buf->lb_buf, &oxe->oxe_buf[namelen + 1], rc);
+       EXIT;
+out:
+       rcu_read_unlock();
+
+       return rc;
+}
+
+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 void osd_oxc_add(struct osd_object *obj, const char *name,
+                       const char *buf, int buflen)
+{
+       struct osd_xattr_entry *oxe;
+       struct osd_xattr_entry *old = NULL;
+       struct osd_xattr_entry *tmp;
+       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);
+       list_for_each_entry(tmp, &obj->oo_xattr_list, oxe_list) {
+               if (namelen == tmp->oxe_namelen &&
+                   strncmp(name, tmp->oxe_buf, namelen) == 0) {
+                       old = tmp;
+                       break;
+               }
+       }
+       if (old != NULL) {
+               list_replace_rcu(&old->oxe_list, &oxe->oxe_list);
+               call_rcu(&old->oxe_rcu, osd_oxc_free);
+       } else {
+               list_add_tail_rcu(&oxe->oxe_list, &obj->oo_xattr_list);
+       }
+       spin_unlock(&obj->oo_guard);
+}
+
+static void osd_oxc_del(struct osd_object *obj, const char *name)
+{
+       struct osd_xattr_entry *oxe;
+       size_t namelen = strlen(name);
+
+       spin_lock(&obj->oo_guard);
+       list_for_each_entry(oxe, &obj->oo_xattr_list, oxe_list) {
+               if (namelen == oxe->oxe_namelen &&
+                   strncmp(name, oxe->oxe_buf, namelen) == 0) {
+                       list_del_rcu(&oxe->oxe_list);
+                       call_rcu(&oxe->oxe_rcu, osd_oxc_free);
+                       break;
+               }
+       }
+       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.
@@ -834,6 +1446,7 @@ 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);
@@ -884,7 +1497,7 @@ enum {
  */
 static void osd_th_alloced(struct osd_thandle *oth)
 {
-        oth->oth_alloced = cfs_time_current();
+       oth->oth_alloced = ktime_get();
 }
 
 /**
@@ -892,58 +1505,42 @@ static void osd_th_alloced(struct osd_thandle *oth)
  */
 static void osd_th_started(struct osd_thandle *oth)
 {
-        oth->oth_started = cfs_time_current();
+       oth->oth_started = ktime_get();
 }
 
 /**
- * Helper function to convert time interval to microseconds packed in
- * long int.
+ * Check whether the we deal with this handle for too long.
  */
-static long interval_to_usec(cfs_time_t start, cfs_time_t end)
+static void __osd_th_check_slow(void *oth, struct osd_device *dev,
+                               ktime_t alloced, ktime_t started,
+                               ktime_t closed)
 {
-        struct timeval val;
+       ktime_t now = ktime_get();
 
-        cfs_duration_usec(cfs_time_sub(end, start), &val);
-        return val.tv_sec * 1000000 + val.tv_usec;
-}
+       LASSERT(dev != NULL);
 
-/**
- * Check whether the we deal with this handle for too long.
- */
-static void __osd_th_check_slow(void *oth, struct osd_device *dev,
-                                cfs_time_t alloced, cfs_time_t started,
-                                cfs_time_t closed)
-{
-        cfs_time_t now = cfs_time_current();
-
-        LASSERT(dev != NULL);
-
-        lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_STARTING,
-                            interval_to_usec(alloced, started));
-        lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_OPEN,
-                            interval_to_usec(started, closed));
-        lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_CLOSING,
-                            interval_to_usec(closed, now));
-
-        if (cfs_time_before(cfs_time_add(alloced, cfs_time_seconds(30)), now)) {
-                CWARN("transaction handle %p was open for too long: "
-                      "now "CFS_TIME_T" ,"
-                      "alloced "CFS_TIME_T" ,"
-                      "started "CFS_TIME_T" ,"
-                      "closed "CFS_TIME_T"\n",
+       lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_STARTING,
+                           ktime_us_delta(started, alloced));
+       lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_OPEN,
+                           ktime_us_delta(closed, started));
+       lprocfs_counter_add(dev->od_stats, LPROC_OSD_THANDLE_CLOSING,
+                           ktime_us_delta(now, closed));
+
+       if (ktime_before(ktime_add_ns(alloced, 30 * NSEC_PER_SEC), now)) {
+               CWARN("transaction handle %p was open for too long: now %lld, alloced %lld, started %lld, closed %lld\n",
                       oth, now, alloced, started, closed);
                 libcfs_debug_dumpstack(NULL);
         }
 }
 
-#define OSD_CHECK_SLOW_TH(oth, dev, expr)                               \
-{                                                                       \
-        cfs_time_t __closed = cfs_time_current();                       \
-        cfs_time_t __alloced = oth->oth_alloced;                        \
-        cfs_time_t __started = oth->oth_started;                        \
-                                                                        \
-        expr;                                                           \
-        __osd_th_check_slow(oth, dev, __alloced, __started, __closed);  \
+#define OSD_CHECK_SLOW_TH(oth, dev, expr)                              \
+{                                                                      \
+       ktime_t __closed = ktime_get();                                 \
+       ktime_t __alloced = oth->oth_alloced;                           \
+       ktime_t __started = oth->oth_started;                           \
+                                                                       \
+       expr;                                                           \
+       __osd_th_check_slow(oth, dev, __alloced, __started, __closed);  \
 }
 
 #else /* OSD_THANDLE_STATS */
@@ -1002,6 +1599,11 @@ static void osd_trans_commit_cb(struct super_block *sb,
        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)
 {
@@ -1011,10 +1613,19 @@ static struct thandle *osd_trans_create(const struct lu_env *env,
        struct thandle          *th;
        ENTRY;
 
+       if (d->dd_rdonly) {
+               CERROR("%s: someone try to start transaction under "
+                      "readonly mode, should be disabled.\n",
+                      osd_name(osd_dt_dev(d)));
+               dump_stack();
+               RETURN(ERR_PTR(-EROFS));
+       }
+
        /* 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;
@@ -1034,6 +1645,9 @@ static struct thandle *osd_trans_create(const struct lu_env *env,
                       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);
 }
@@ -1114,16 +1728,15 @@ 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);
-
-               osd_trans_dump_creds(env, th);
-
+               /* 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) {
+                       CWARN("%s: credits %u > trans_max %u\n", osd_name(dev),
+                             oh->ot_credits, osd_transaction_size(dev));
+                       osd_trans_dump_creds(env, th);
                        libcfs_debug_dumpstack(NULL);
                        last_credits = oh->ot_credits;
                        last_printed = jiffies;
@@ -1135,6 +1748,14 @@ static int osd_trans_start(const struct lu_env *env, struct dt_device *d,
                 *     This should be removed when we can calculate the
                 *     credits precisely. */
                oh->ot_credits = osd_transaction_size(dev);
+       } else if (ldiskfs_track_declares_assert != 0) {
+               /* reserve few credits to prevent an assertion in JBD
+                * our debugging mechanism will be able to detected
+                * overuse. this can help to debug single-update
+                * transactions */
+               oh->ot_credits += 10;
+               if (unlikely(osd_param_is_not_sane(dev, th)))
+                       oh->ot_credits = osd_transaction_size(dev);
        }
 
         /*
@@ -1175,8 +1796,8 @@ static int osd_seq_exists(const struct lu_env *env,
        rc = osd_fld_lookup(env, osd, seq, range);
        if (rc != 0) {
                if (rc != -ENOENT)
-                       CERROR("%s: can't lookup FLD sequence "LPX64
-                              ": rc = %d\n", osd_name(osd), seq, rc);
+                       CERROR("%s: can't lookup FLD sequence %#llx: rc = %d\n",
+                              osd_name(osd), seq, rc);
                RETURN(0);
        }
 
@@ -1216,12 +1837,16 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
 
        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) {
+               int rc2;
                 handle_t *hdl = oh->ot_handle;
 
                 /*
@@ -1245,10 +1870,12 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
                hdl->h_sync = th->th_sync;
 
                oh->ot_handle = NULL;
-               OSD_CHECK_SLOW_TH(oh, osd, rc = ldiskfs_journal_stop(hdl));
-               if (rc != 0)
+               OSD_CHECK_SLOW_TH(oh, osd, rc2 = ldiskfs_journal_stop(hdl));
+               if (rc2 != 0)
                        CERROR("%s: failed to stop transaction: rc = %d\n",
-                              osd_name(osd), rc);
+                              osd_name(osd), rc2);
+               if (!rc)
+                       rc = rc2;
        } else {
                osd_trans_stop_cb(oh, th->th_result);
                OBD_FREE_PTR(oh);
@@ -1275,6 +1902,8 @@ static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
        if (unlikely(remove_agents != 0))
                osd_process_scheduled_agent_removals(env, osd);
 
+       sb_end_write(osd_sb(osd));
+
        RETURN(rc);
 }
 
@@ -1330,6 +1959,9 @@ static void osd_object_delete(const struct lu_env *env, struct lu_object *l)
 
                        qi->lqi_id.qid_uid = gid;
                        qsd_op_adjust(env, qsd, &qi->lqi_id, GRPQUOTA);
+
+                       qi->lqi_id.qid_uid = i_projid_read(inode);
+                       qsd_op_adjust(env, qsd, &qi->lqi_id, PRJQUOTA);
                }
         }
 }
@@ -1340,6 +1972,12 @@ 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();
 }
 
 /*
@@ -1363,18 +2001,17 @@ 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;
@@ -1388,34 +2025,40 @@ 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 (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;
-       }
-       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;
 }
 
 /**
@@ -1444,21 +2087,23 @@ 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;
        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;
-       /* 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 */
        /* 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))
@@ -1537,6 +2182,12 @@ 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);
@@ -1544,10 +2195,16 @@ 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);
+
+       if (sb->s_op->unfreeze_fs)
+               sb->s_op->unfreeze_fs(sb);
+
+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);
 }
 
@@ -1703,14 +2360,13 @@ 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)
 {
        attr->la_valid  |= LA_ATIME | LA_MTIME | LA_CTIME | LA_MODE |
                           LA_SIZE | LA_BLOCKS | LA_UID | LA_GID |
-                          LA_FLAGS | LA_NLINK | LA_RDEV | LA_BLKSIZE |
-                          LA_TYPE;
+                          LA_PROJID | LA_FLAGS | LA_NLINK | LA_RDEV |
+                          LA_BLKSIZE | LA_TYPE;
 
        attr->la_atime   = LTIME_S(inode->i_atime);
        attr->la_mtime   = LTIME_S(inode->i_mtime);
@@ -1720,11 +2376,19 @@ 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_projid  = i_projid_read(inode);
+       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;
        attr->la_blkbits = inode->i_blkbits;
+       /*
+        * Ext4 did not transfer inherit flags from raw inode
+        * to inode flags, and ext4 internally test raw inode
+        * @i_flags directly. Instead of patching ext4, we do it here.
+        */
+       if (LDISKFS_I(inode)->i_flags & LUSTRE_PROJINHERIT_FL)
+               attr->la_flags |= LUSTRE_PROJINHERIT_FL;
 }
 
 static int osd_attr_get(const struct lu_env *env,
@@ -1733,7 +2397,9 @@ static int osd_attr_get(const struct lu_env *env,
 {
        struct osd_object *obj = osd_dt_obj(dt);
 
-       if (!dt_object_exists(dt))
+       if (unlikely(!dt_object_exists(dt)))
+               return -ENOENT;
+       if (unlikely(obj->oo_destroyed))
                return -ENOENT;
 
        LASSERT(!dt_object_remote(dt));
@@ -1741,10 +2407,72 @@ static int osd_attr_get(const struct lu_env *env,
 
        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;
 }
 
+static int osd_declare_attr_qid(const struct lu_env *env,
+                               struct osd_object *obj,
+                               struct osd_thandle *oh, long long bspace,
+                               qid_t old_id, qid_t new_id, bool enforce,
+                               unsigned type)
+{
+       int rc;
+       struct osd_thread_info *info = osd_oti_get(env);
+       struct lquota_id_info  *qi = &info->oti_qi;
+
+       qi->lqi_type = type;
+       /* inode accounting */
+       qi->lqi_is_blk = false;
+
+       /* one more inode for the new id ... */
+       qi->lqi_id.qid_uid = new_id;
+       qi->lqi_space      = 1;
+       /* Reserve credits for the new id */
+       rc = osd_declare_qid(env, oh, qi, NULL, enforce, NULL);
+       if (rc == -EDQUOT || rc == -EINPROGRESS)
+               rc = 0;
+       if (rc)
+               RETURN(rc);
+
+       /* and one less inode for the current id */
+       qi->lqi_id.qid_uid = old_id;
+       qi->lqi_space      = -1;
+       rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
+       if (rc == -EDQUOT || rc == -EINPROGRESS)
+               rc = 0;
+       if (rc)
+               RETURN(rc);
+
+       /* block accounting */
+       qi->lqi_is_blk = true;
+
+       /* more blocks for the new uid ... */
+       qi->lqi_id.qid_uid = new_id;
+       qi->lqi_space      = bspace;
+       /*
+        * Credits for the new uid has been reserved, re-use "obj"
+        * to save credit reservation.
+        */
+       rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
+       if (rc == -EDQUOT || rc == -EINPROGRESS)
+               rc = 0;
+       if (rc)
+               RETURN(rc);
+
+       /* and finally less blocks for the current uid */
+       qi->lqi_id.qid_uid = old_id;
+       qi->lqi_space      = -bspace;
+       rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
+       if (rc == -EDQUOT || rc == -EINPROGRESS)
+               rc = 0;
+
+       RETURN(rc);
+}
+
 static int osd_declare_attr_set(const struct lu_env *env,
                                 struct dt_object *dt,
                                 const struct lu_attr *attr,
@@ -1752,8 +2480,6 @@ static int osd_declare_attr_set(const struct lu_env *env,
 {
        struct osd_thandle     *oh;
        struct osd_object      *obj;
-       struct osd_thread_info *info = osd_oti_get(env);
-       struct lquota_id_info  *qi = &info->oti_qi;
        qid_t                   uid;
        qid_t                   gid;
        long long               bspace;
@@ -1773,6 +2499,9 @@ 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);
 
@@ -1789,103 +2518,33 @@ static int osd_declare_attr_set(const struct lu_env *env,
        if (attr->la_valid & LA_UID || attr->la_valid & LA_GID) {
                /* USERQUOTA */
                uid = i_uid_read(obj->oo_inode);
-               qi->lqi_type = USRQUOTA;
                enforce = (attr->la_valid & LA_UID) && (attr->la_uid != uid);
-               /* inode accounting */
-               qi->lqi_is_blk = false;
-
-               /* one more inode for the new uid ... */
-               qi->lqi_id.qid_uid = attr->la_uid;
-               qi->lqi_space      = 1;
-               /* Reserve credits for the new uid */
-               rc = osd_declare_qid(env, oh, qi, NULL, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
-               if (rc)
-                       RETURN(rc);
-
-               /* and one less inode for the current uid */
-               qi->lqi_id.qid_uid = uid;
-               qi->lqi_space      = -1;
-               rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
-               if (rc)
-                       RETURN(rc);
-
-               /* block accounting */
-               qi->lqi_is_blk = true;
-
-               /* more blocks for the new uid ... */
-               qi->lqi_id.qid_uid = attr->la_uid;
-               qi->lqi_space      = bspace;
-               /*
-                * Credits for the new uid has been reserved, re-use "obj"
-                * to save credit reservation.
-                */
-               rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
-               if (rc)
-                       RETURN(rc);
-
-               /* and finally less blocks for the current uid */
-               qi->lqi_id.qid_uid = uid;
-               qi->lqi_space      = -bspace;
-               rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
+               rc = osd_declare_attr_qid(env, obj, oh, bspace, uid,
+                               attr->la_uid, enforce, USRQUOTA);
                if (rc)
                        RETURN(rc);
 
-               /* GROUP QUOTA */
                gid = i_gid_read(obj->oo_inode);
-               qi->lqi_type = GRPQUOTA;
                enforce = (attr->la_valid & LA_GID) && (attr->la_gid != gid);
-
-               /* inode accounting */
-               qi->lqi_is_blk = false;
-
-               /* one more inode for the new gid ... */
-               qi->lqi_id.qid_gid = attr->la_gid;
-               qi->lqi_space      = 1;
-               rc = osd_declare_qid(env, oh, qi, NULL, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
+               rc = osd_declare_attr_qid(env, obj, oh, bspace,
+                               i_gid_read(obj->oo_inode), attr->la_gid,
+                               enforce, GRPQUOTA);
                if (rc)
                        RETURN(rc);
 
-               /* and one less inode for the current gid */
-               qi->lqi_id.qid_gid = gid;
-               qi->lqi_space      = -1;
-               rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
-               if (rc)
-                       RETURN(rc);
-
-               /* block accounting */
-               qi->lqi_is_blk = true;
-
-               /* more blocks for the new gid ... */
-               qi->lqi_id.qid_gid = attr->la_gid;
-               qi->lqi_space      = bspace;
-               rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
-               if (rc)
-                       RETURN(rc);
-
-               /* and finally less blocks for the current gid */
-               qi->lqi_id.qid_gid = gid;
-               qi->lqi_space      = -bspace;
-               rc = osd_declare_qid(env, oh, qi, obj, enforce, NULL);
-               if (rc == -EDQUOT || rc == -EINPROGRESS)
-                       rc = 0;
+       }
+#ifdef HAVE_PROJECT_QUOTA
+       if (attr->la_valid & LA_PROJID) {
+               __u32 projid = i_projid_read(obj->oo_inode);
+               enforce = (attr->la_valid & LA_PROJID) &&
+                                       (attr->la_projid != projid);
+               rc = osd_declare_attr_qid(env, obj, oh, bspace,
+                               (qid_t)projid, (qid_t)attr->la_projid,
+                               enforce, PRJQUOTA);
                if (rc)
                        RETURN(rc);
        }
-
+#endif
        RETURN(rc);
 }
 
@@ -1901,23 +2560,21 @@ 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) {
+               spin_lock(&inode->i_lock);
+               LDISKFS_I(inode)->i_disksize = attr->la_size;
+               i_size_write(inode, attr->la_size);
+               spin_unlock(&inode->i_lock);
+       }
 
-#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);
@@ -1925,25 +2582,35 @@ static int osd_inode_setattr(const struct lu_env *env,
                i_uid_write(inode, attr->la_uid);
        if (bits & LA_GID)
                i_gid_write(inode, attr->la_gid);
+       if (bits & LA_PROJID)
+               i_projid_write(inode, attr->la_projid);
        if (bits & LA_NLINK)
                set_nlink(inode, attr->la_nlink);
        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;
+               /*
+                * Ext4 did not transfer inherit flags from
+                * @inode->i_flags to raw inode i_flags when writing
+                * flags, we do it explictly here.
+                */
+               if (attr->la_flags & LUSTRE_PROJINHERIT_FL)
+                       LDISKFS_I(inode)->i_flags |= LUSTRE_PROJINHERIT_FL;
+       }
+       return 0;
 }
 
 static int osd_quota_transfer(struct inode *inode, const struct lu_attr *attr)
 {
+       int rc;
+
        if ((attr->la_valid & LA_UID && attr->la_uid != i_uid_read(inode)) ||
            (attr->la_valid & LA_GID && attr->la_gid != i_gid_read(inode))) {
                struct iattr    iattr;
-               int             rc;
 
                ll_vfs_dq_init(inode);
                iattr.ia_valid = 0;
@@ -1962,6 +2629,20 @@ static int osd_quota_transfer(struct inode *inode, const struct lu_attr *attr)
                        return rc;
                }
        }
+
+#ifdef HAVE_PROJECT_QUOTA
+       /* Handle project id transfer here properly */
+       if (attr->la_valid & LA_PROJID && attr->la_projid !=
+                                               i_projid_read(inode)) {
+               rc = __ldiskfs_ioctl_setproject(inode, attr->la_projid);
+               if (rc) {
+                       CERROR("%s: quota transfer failed: rc = %d. Is quota "
+                              "enforcement enabled on the ldiskfs "
+                              "filesystem?\n", inode->i_sb->s_id, rc);
+                       return rc;
+               }
+       }
+#endif
        return 0;
 }
 
@@ -2017,10 +2698,42 @@ 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);
 
-        if (!rc)
-               ll_dirty_inode(inode, I_DIRTY_DATASYNC);
+       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_ost_attrs.loa_lma;
 
+               rc = osd_get_lma(info, inode, &info->oti_obj_dentry,
+                                &info->oti_ost_attrs);
+               if (rc)
+                       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);
 
         return rc;
@@ -2090,22 +2803,22 @@ enum {
 };
 
 static int osd_mkdir(struct osd_thread_info *info, struct osd_object *obj,
-                     struct lu_attr *attr,
-                     struct dt_allocation_hint *hint,
-                     struct dt_object_format *dof,
-                     struct thandle *th)
+                    struct lu_attr *attr,
+                    struct dt_allocation_hint *hint,
+                    struct dt_object_format *dof,
+                    struct thandle *th)
 {
-        int result;
-        struct osd_thandle *oth;
-        __u32 mode = (attr->la_mode & (S_IFMT | S_IRWXUGO | S_ISVTX));
+       int result;
+       struct osd_thandle *oth;
+       __u32 mode = (attr->la_mode & (S_IFMT | S_IRWXUGO | S_ISVTX | S_ISGID));
 
-        LASSERT(S_ISDIR(attr->la_mode));
+       LASSERT(S_ISDIR(attr->la_mode));
 
-        oth = container_of(th, struct osd_thandle, ot_super);
-        LASSERT(oth->ot_handle->h_transaction != NULL);
-        result = osd_mkfile(info, obj, mode, hint, th);
+       oth = container_of(th, struct osd_thandle, ot_super);
+       LASSERT(oth->ot_handle->h_transaction != NULL);
+       result = osd_mkfile(info, obj, mode, hint, th);
 
-        return result;
+       return result;
 }
 
 static int osd_mk_index(struct osd_thread_info *info, struct osd_object *obj,
@@ -2238,6 +2951,12 @@ 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,
@@ -2262,20 +2981,20 @@ 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;
 }
 
 /**
@@ -2342,7 +3061,8 @@ static int __osd_oi_insert(const struct lu_env *env, struct osd_object *obj,
        osd_trans_exec_op(env, th, OSD_OT_INSERT);
 
        osd_id_gen(id, obj->oo_inode->i_ino, obj->oo_inode->i_generation);
-       rc = 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;
@@ -2408,11 +3128,16 @@ static int osd_declare_object_create(const struct lu_env *env,
        if (!attr)
                RETURN(0);
 
-       rc = osd_declare_inode_qid(env, attr->la_uid, attr->la_gid, 1, oh,
-                                  osd_dt_obj(dt), false, NULL, false);
+       rc = osd_declare_inode_qid(env, attr->la_uid, attr->la_gid,
+                                  attr->la_projid, 1, oh, osd_dt_obj(dt),
+                                  false, NULL, false);
        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);
 }
 
@@ -2468,24 +3193,36 @@ 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]);
        /* Recycle idle OI leaf may cause additional three OI blocks
         * to be changed. */
-       osd_trans_declare_op(env, oh, OSD_OT_DELETE,
+       if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LOST_MDTOBJ2))
+               osd_trans_declare_op(env, oh, OSD_OT_DELETE,
                             osd_dto_credits_noquota[DTO_INDEX_DELETE] + 3);
        /* one less inode */
        rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
-                                  -1, oh, obj, false, NULL, false);
+                                  i_projid_read(inode), -1, oh, obj, false,
+                                  NULL, false);
        if (rc)
                RETURN(rc);
        /* data to be truncated */
        rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
-                                  0, oh, obj, true, NULL, false);
+                                  i_projid_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);
 }
 
@@ -2515,10 +3252,10 @@ static int osd_object_destroy(const struct lu_env *env,
                /* it will check/delete the inode from remote parent,
                 * how to optimize it? unlink performance impaction XXX */
                result = osd_delete_from_remote_parent(env, osd, obj, oh);
-               if (result != 0 && result != -ENOENT) {
+               if (result != 0)
                        CERROR("%s: delete inode "DFID": rc = %d\n",
                               osd_name(osd), PFID(fid), result);
-               }
+
                spin_lock(&obj->oo_guard);
                clear_nlink(inode);
                spin_unlock(&obj->oo_guard);
@@ -2528,8 +3265,10 @@ 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);
+
+       if (!OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LOST_MDTOBJ2))
+               result = osd_oi_delete(osd_oti_get(env), osd, fid,
+                                      oh->ot_handle, OI_CHECK_FLD);
 
        osd_trans_exec_check(env, th, OSD_OT_DESTROY);
        /* XXX: add to ext3 orphan list */
@@ -2555,8 +3294,9 @@ static int osd_object_destroy(const struct lu_env *env,
 int osd_ea_fid_set(struct osd_thread_info *info, struct inode *inode,
                   const struct lu_fid *fid, __u32 compat, __u32 incompat)
 {
-       struct lustre_mdt_attrs *lma = &info->oti_mdt_attrs;
-       int                      rc;
+       struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
+       struct lustre_mdt_attrs *lma = &loa->loa_lma;
+       int rc;
        ENTRY;
 
        if (OBD_FAIL_CHECK(OBD_FAIL_FID_INLMA))
@@ -2565,33 +3305,50 @@ int osd_ea_fid_set(struct osd_thread_info *info, struct inode *inode,
        if (OBD_FAIL_CHECK(OBD_FAIL_OSD_OST_EA_FID_SET))
                rc = -ENOMEM;
 
-       lustre_lma_init(lma, fid, compat, incompat);
-       lustre_lma_swab(lma);
-
-       rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma, sizeof(*lma),
-                            XATTR_CREATE);
+       lustre_loa_init(loa, fid, compat, incompat);
+       lustre_loa_swab(loa, false);
+
+       /* For the OST device with 256 bytes inode size by default,
+        * the PFID EA will be stored together with LMA EA to avoid
+        * performance trouble. Otherwise the PFID EA can be stored
+        * independently. LU-8998 */
+       if ((compat & LMAC_FID_ON_OST) &&
+           LDISKFS_INODE_SIZE(inode->i_sb) <= 256)
+               rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, loa,
+                                    sizeof(*loa), XATTR_CREATE);
+       else
+               rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
+                                    sizeof(*lma), XATTR_CREATE);
        /* LMA may already exist, but we need to check that all the
         * desired compat/incompat flags have been added. */
        if (unlikely(rc == -EEXIST)) {
-               if (compat == 0 && incompat == 0)
-                       RETURN(0);
-
                rc = __osd_xattr_get(inode, &info->oti_obj_dentry,
-                                    XATTR_NAME_LMA, info->oti_mdt_attrs_old,
-                                    LMA_OLD_SIZE);
-               if (rc <= 0)
+                                    XATTR_NAME_LMA, (void *)loa, sizeof(*loa));
+               if (rc < 0)
+                       RETURN(rc);
+
+               if (rc < sizeof(*lma))
                        RETURN(-EINVAL);
 
-               lustre_lma_swab(lma);
-               if (!(~lma->lma_compat & compat) &&
-                   !(~lma->lma_incompat & incompat))
+               lustre_loa_swab(loa, true);
+               if (lu_fid_eq(fid, &lma->lma_self_fid) &&
+                   ((compat == 0 && incompat == 0) ||
+                    (!(~lma->lma_compat & compat) &&
+                     !(~lma->lma_incompat & incompat))))
                        RETURN(0);
 
+               lma->lma_self_fid = *fid;
                lma->lma_compat |= compat;
                lma->lma_incompat |= incompat;
-               lustre_lma_swab(lma);
-               rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
-                                    sizeof(*lma), XATTR_REPLACE);
+               if (rc == sizeof(*lma)) {
+                       lustre_lma_swab(lma);
+                       rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
+                                            sizeof(*lma), XATTR_REPLACE);
+               } else {
+                       lustre_loa_swab(loa, false);
+                       rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, loa,
+                                            sizeof(*loa), XATTR_REPLACE);
+               }
        }
 
        RETURN(rc);
@@ -2652,6 +3409,8 @@ 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);
@@ -2659,8 +3418,23 @@ static int osd_add_dot_dotdot_internal(struct osd_thread_info *info,
        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;
 }
 
 /**
@@ -2690,9 +3464,25 @@ static struct inode *osd_create_local_agent_inode(const struct lu_env *env,
                RETURN(local);
        }
 
+       /* restore i_gid in case S_ISGID is set, we will inherit S_ISGID and set
+        * correct gid on remote file, not agent here */
+       local->i_gid = current_fsgid();
        ldiskfs_set_inode_state(local, LDISKFS_STATE_LUSTRE_NOSCRUB);
        unlock_new_inode(local);
 
+       /* Agent inode should not have project ID*/
+#ifdef HAVE_PROJECT_QUOTA
+       if (LDISKFS_I(pobj->oo_inode)->i_flags & LUSTRE_PROJINHERIT_FL) {
+               rc = __ldiskfs_ioctl_setproject(local, 0);
+               if (rc) {
+                       CERROR("%s: quota transfer failed: rc = %d. Is project "
+                              "quota enforcement enabled on the ldiskfs "
+                              "filesystem?\n", local->i_sb->s_id, rc);
+                       RETURN(ERR_PTR(rc));
+               }
+       }
+
+#endif
        /* Set special LMA flag for local agent inode */
        rc = osd_ea_fid_set(info, local, fid, 0, LMAI_AGENT);
        if (rc != 0) {
@@ -2816,7 +3606,7 @@ 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;
 
@@ -2842,13 +3632,15 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
 
                        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,
-                               fid_is_on_ost(info, osd_obj2dev(obj),
-                                             fid, OI_CHECK_FLD) ?
-                               LMAC_FID_ON_OST : 0, 0);
+                                               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;
@@ -2857,6 +3649,15 @@ static int osd_object_ea_create(const struct lu_env *env, struct dt_object *dt,
        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));
@@ -2892,7 +3693,7 @@ static int osd_object_ref_add(const struct lu_env *env,
        struct osd_thandle *oh;
        int                 rc = 0;
 
-       if (!dt_object_exists(dt))
+       if (!dt_object_exists(dt) || obj->oo_destroyed)
                return -ENOENT;
 
        LINVRNT(osd_invariant(obj));
@@ -2943,6 +3744,9 @@ static int osd_declare_object_ref_del(const struct lu_env *env,
 {
        struct osd_thandle *oh;
 
+       if (!dt_object_exists(dt))
+               return -ENOENT;
+
        LASSERT(!dt_object_remote(dt));
        LASSERT(handle != NULL);
 
@@ -3007,44 +3811,39 @@ static int osd_object_ref_del(const struct lu_env *env, struct dt_object *dt,
 }
 
 /*
- * Get the 64-bit version for an inode.
- */
-static int osd_object_version_get(const struct lu_env *env,
-                                  struct dt_object *dt, dt_obj_version_t *ver)
-{
-        struct inode *inode = osd_dt_obj(dt)->oo_inode;
-
-        CDEBUG(D_INODE, "Get version "LPX64" for inode %lu\n",
-               LDISKFS_I(inode)->i_fs_version, inode->i_ino);
-        *ver = LDISKFS_I(inode)->i_fs_version;
-        return 0;
-}
-
-/*
  * 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 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;
+
+       LASSERT(buf);
 
-        /* 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) {
+               dt_obj_version_t *ver = buf->lb_buf;
+
+               /* for version we are just using xattr API but change inode
+                * field instead */
                if (buf->lb_len == 0)
                        return sizeof(dt_obj_version_t);
 
                if (buf->lb_len < sizeof(dt_obj_version_t))
                        return -ERANGE;
 
-               osd_object_version_get(env, dt, buf->lb_buf);
+               CDEBUG(D_INODE, "Get version %#llx for inode %lu\n",
+                      LDISKFS_I(inode)->i_fs_version, inode->i_ino);
+
+               *ver = LDISKFS_I(inode)->i_fs_version;
 
                return sizeof(dt_obj_version_t);
-        }
+       }
 
        if (!dt_object_exists(dt))
                return -ENOENT;
@@ -3053,9 +3852,69 @@ static int osd_xattr_get(const struct lu_env *env, struct dt_object *dt,
        LASSERT(inode->i_op != NULL);
        LASSERT(inode->i_op->getxattr != NULL);
 
-       return __osd_xattr_get(inode, dentry, name, buf->lb_buf, buf->lb_len);
-}
+       if (strcmp(name, XATTR_NAME_LOV) == 0 ||
+           strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
+               cache_xattr = true;
+
+       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 (rc == -ENODATA && strcmp(name, XATTR_NAME_FID) == 0) {
+               struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
+               struct lustre_mdt_attrs *lma = &loa->loa_lma;
+               struct filter_fid *ff;
+               struct ost_layout *ol;
+
+               LASSERT(osd_dev(dt->do_lu.lo_dev)->od_is_ost);
+
+               rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
+               if (rc)
+                       return rc;
+
+               if (!(lma->lma_compat & LMAC_STRIPE_INFO)) {
+                       rc = -ENODATA;
+                       goto cache;
+               }
+
+               rc = sizeof(*ff);
+               if (buf->lb_len == 0 || !buf->lb_buf)
+                       return rc;
+
+               if (buf->lb_len < rc)
+                       return -ERANGE;
 
+               ff = buf->lb_buf;
+               ol = &ff->ff_layout;
+               ol->ol_stripe_count = cpu_to_le32(loa->loa_parent_fid.f_ver >>
+                                                 PFID_STRIPE_IDX_BITS);
+               ol->ol_stripe_size = cpu_to_le32(loa->loa_stripe_size);
+               loa->loa_parent_fid.f_ver &= PFID_STRIPE_COUNT_MASK;
+               fid_cpu_to_le(&ff->ff_parent, &loa->loa_parent_fid);
+               if (lma->lma_compat & LMAC_COMP_INFO) {
+                       ol->ol_comp_start = cpu_to_le64(loa->loa_comp_start);
+                       ol->ol_comp_end = cpu_to_le64(loa->loa_comp_end);
+                       ol->ol_comp_id = cpu_to_le32(loa->loa_comp_id);
+               } else {
+                       ol->ol_comp_start = 0;
+                       ol->ol_comp_end = 0;
+                       ol->ol_comp_id = 0;
+               }
+       }
+
+cache:
+       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,
@@ -3063,7 +3922,7 @@ static int osd_declare_xattr_set(const struct lu_env *env,
                                  int fl, struct thandle *handle)
 {
        struct osd_thandle *oh;
-       int credits;
+       int credits = 0;
        struct super_block *sb = osd_sb(osd_dev(dt->do_lu.lo_dev));
 
        LASSERT(handle != NULL);
@@ -3075,17 +3934,25 @@ static int osd_declare_xattr_set(const struct lu_env *env,
                /* 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 if (fl == LU_XATTR_REPLACE)
-                       credits = 1;
-               else
-                       goto upgrade;
+               if (dt_object_exists(dt)) {
+                       if (fl == LU_XATTR_REPLACE)
+                               credits = 1;
+                       else
+                               goto upgrade;
+               }
        } else if (strcmp(name, XATTR_NAME_VERSION) == 0) {
                credits = 1;
+       } else if (strcmp(name, XATTR_NAME_FID) == 0) {
+               /* We may need to delete the old PFID EA. */
+               credits = LDISKFS_MAXQUOTAS_DEL_BLOCKS(sb);
+               if (fl == LU_XATTR_REPLACE)
+                       credits += 1;
+               else
+                       goto upgrade;
        } else {
+
 upgrade:
-               credits = osd_dto_credits_noquota[DTO_XATTR_SET];
+               credits += osd_dto_credits_noquota[DTO_XATTR_SET];
 
                if (buf != NULL) {
                        ssize_t buflen;
@@ -3117,27 +3984,9 @@ upgrade:
                credits += LDISKFS_MAXQUOTAS_INIT_BLOCKS(sb);
        }
 
-       osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET, credits);
-
-       return 0;
-}
-
-/*
- * Set the 64-bit version for object
- */
-static void osd_object_version_set(const struct lu_env *env,
-                                   struct dt_object *dt,
-                                   dt_obj_version_t *new_version)
-{
-        struct inode *inode = osd_dt_obj(dt)->oo_inode;
-
-        CDEBUG(D_INODE, "Set version "LPX64" (old "LPX64") for inode %lu\n",
-               *new_version, LDISKFS_I(inode)->i_fs_version, inode->i_ino);
+       osd_trans_declare_op(env, oh, OSD_OT_XATTR_SET, credits);
 
-        LDISKFS_I(inode)->i_fs_version = *new_version;
-        /** Version is set after all inode operations are finished,
-         *  so we should mark it dirty here */
-       ll_dirty_inode(inode, I_DIRTY_DATASYNC);
+       return 0;
 }
 
 /*
@@ -3147,27 +3996,42 @@ 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 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;
+       struct osd_object *obj = osd_dt_obj(dt);
+       struct inode *inode = obj->oo_inode;
+       struct osd_thread_info *info = osd_oti_get(env);
+       struct lustre_ost_attrs *loa = &info->oti_ost_attrs;
+       struct lustre_mdt_attrs *lma = &loa->loa_lma;
+       int fs_flags = 0;
+       int len;
+       int rc;
        ENTRY;
 
-        LASSERT(handle != NULL);
+       LASSERT(handle);
+       LASSERT(buf);
 
-        /* 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);
-        }
+       /* version set is not real XATTR */
+       if (strcmp(name, XATTR_NAME_VERSION) == 0) {
+               dt_obj_version_t *version = buf->lb_buf;
+
+               /* for version we are just using xattr API but change inode
+                * field instead */
+               LASSERT(buf->lb_len == sizeof(dt_obj_version_t));
+
+               CDEBUG(D_INODE, "Set version %#llx (old %#llx) for inode %lu\n",
+                      *version, LDISKFS_I(inode)->i_fs_version, inode->i_ino);
+
+               LDISKFS_I(inode)->i_fs_version = *version;
+               /* Version is set after all inode operations are finished,
+                * so we should mark it dirty here */
+               ll_dirty_inode(inode, I_DIRTY_DATASYNC);
+
+               RETURN(0);
+       }
 
        CDEBUG(D_INODE, DFID" set xattr '%s' with size %zu\n",
               PFID(lu_object_fid(&dt->do_lu)), name, buf->lb_len);
 
+       len = buf->lb_len;
        osd_trans_exec_op(env, handle, OSD_OT_XATTR_SET);
        if (fl & LU_XATTR_REPLACE)
                fs_flags |= XATTR_REPLACE;
@@ -3175,12 +4039,72 @@ static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
        if (fl & LU_XATTR_CREATE)
                fs_flags |= XATTR_CREATE;
 
-       if (strcmp(name, XATTR_NAME_LMV) == 0) {
-               struct lustre_mdt_attrs *lma = &info->oti_mdt_attrs;
-               int                      rc;
+       /* For the OST device with 256 bytes inode size by default,
+        * the PFID EA will be stored together with LMA EA to avoid
+        * performance trouble. Otherwise the PFID EA can be stored
+        * independently. LU-8998 */
+       if (strcmp(name, XATTR_NAME_FID) == 0 &&
+           LDISKFS_INODE_SIZE(inode->i_sb) <= 256) {
+               struct dentry *dentry = &info->oti_obj_dentry;
+               struct filter_fid *ff;
+               struct ost_layout *ol;
+               int fl;
+
+               LASSERT(osd_dev(dt->do_lu.lo_dev)->od_is_ost);
+
+               ff = buf->lb_buf;
+               ol = &ff->ff_layout;
+               /* Old client does not send stripe information, store
+                * the PFID EA on disk directly. */
+               if (buf->lb_len == sizeof(struct lu_fid) ||
+                   ol->ol_stripe_size == 0) {
+                       len = sizeof(struct lu_fid);
+                       goto set;
+               }
 
-               rc = osd_get_lma(info, inode, &info->oti_obj_dentry, lma);
-               if (rc != 0)
+               if (buf->lb_len != sizeof(*ff))
+                       RETURN(-EINVAL);
+
+               rc = osd_get_lma(info, inode, dentry, loa);
+               if (unlikely(rc == -ENODATA)) {
+                       /* Usually for upgarding from old device */
+                       lustre_loa_init(loa, lu_object_fid(&dt->do_lu),
+                                       LMAC_FID_ON_OST, 0);
+                       fl = XATTR_CREATE;
+               } else if (rc) {
+                       RETURN(rc);
+               } else {
+                       fl = XATTR_REPLACE;
+               }
+
+               fid_le_to_cpu(&loa->loa_parent_fid, &ff->ff_parent);
+               loa->loa_parent_fid.f_ver |= le32_to_cpu(ol->ol_stripe_count) <<
+                                            PFID_STRIPE_IDX_BITS;
+               loa->loa_stripe_size = le32_to_cpu(ol->ol_stripe_size);
+               lma->lma_compat |= LMAC_STRIPE_INFO;
+               if (ol->ol_comp_id != 0) {
+                       loa->loa_comp_id = le32_to_cpu(ol->ol_comp_id);
+                       loa->loa_comp_start = le64_to_cpu(ol->ol_comp_start);
+                       loa->loa_comp_end = le64_to_cpu(ol->ol_comp_end);
+                       lma->lma_compat |= LMAC_COMP_INFO;
+               }
+
+               lustre_loa_swab(loa, false);
+
+               /* Remove old PFID EA entry firstly. */
+               ll_vfs_dq_init(inode);
+               rc = inode->i_op->removexattr(dentry, name);
+               if (rc && rc != -ENODATA)
+                       RETURN(rc);
+
+               /* Store the PFID EA inside the LMA EA. */
+               rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, loa,
+                                    sizeof(*loa), fl);
+
+               RETURN(rc);
+       } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
+               rc = osd_get_lma(info, inode, &info->oti_obj_dentry, loa);
+               if (rc)
                        RETURN(rc);
 
                lma->lma_incompat |= LMAI_STRIPED;
@@ -3191,14 +4115,15 @@ static int osd_xattr_set(const struct lu_env *env, struct dt_object *dt,
                        RETURN(rc);
        }
 
-       if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_OVERFLOW) &&
-           strcmp(name, XATTR_NAME_LINK) == 0)
-               return -ENOSPC;
-
-       rc = __osd_xattr_set(info, inode, name, buf->lb_buf, buf->lb_len,
-                              fs_flags);
+set:
+       rc = __osd_xattr_set(info, inode, name, buf->lb_buf, 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;
 }
 
@@ -3275,7 +4200,34 @@ static int osd_xattr_del(const struct lu_env *env, struct dt_object *dt,
        dentry->d_inode = inode;
        dentry->d_sb = inode->i_sb;
        rc = inode->i_op->removexattr(dentry, name);
+       if (rc == -ENODATA && strcmp(name, XATTR_NAME_FID) == 0) {
+               struct lustre_mdt_attrs *lma = &info->oti_ost_attrs.loa_lma;
+
+               LASSERT(osd_dev(dt->do_lu.lo_dev)->od_is_ost);
+
+               rc = osd_get_lma(info, inode, &info->oti_obj_dentry,
+                                &info->oti_ost_attrs);
+               if (!rc) {
+                       if (!(lma->lma_compat & LMAC_STRIPE_INFO)) {
+                               rc = -ENODATA;
+                               goto out;
+                       }
+
+                       lma->lma_compat &= ~(LMAC_STRIPE_INFO | LMAC_COMP_INFO);
+                       lustre_lma_swab(lma);
+                       rc = __osd_xattr_set(info, inode, XATTR_NAME_LMA, lma,
+                                            sizeof(*lma), XATTR_REPLACE);
+               }
+       }
+
+out:
        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_del(obj, name);
+
        return rc;
 }
 
@@ -3303,6 +4255,11 @@ static int osd_object_sync(const struct lu_env *env, struct dt_object *dt,
        RETURN(rc);
 }
 
+static int osd_invalidate(const struct lu_env *env, struct dt_object *dt)
+{
+       return 0;
+}
+
 /*
  * Index operations.
  */
@@ -3375,7 +4332,7 @@ 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;
@@ -3429,10 +4386,6 @@ static int osd_index_try(const struct lu_env *env, struct dt_object *dt,
         }
         LINVRNT(osd_invariant(obj));
 
-       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);
-
         return result;
 }
 
@@ -3470,6 +4423,7 @@ static const struct dt_object_operations osd_obj_ops = {
         .do_xattr_del         = osd_xattr_del,
         .do_xattr_list        = osd_xattr_list,
         .do_object_sync       = osd_object_sync,
+       .do_invalidate        = osd_invalidate,
 };
 
 /**
@@ -3502,6 +4456,7 @@ static const struct dt_object_operations osd_obj_ea_ops = {
         .do_xattr_del         = osd_xattr_del,
         .do_xattr_list        = osd_xattr_list,
         .do_object_sync       = osd_object_sync,
+       .do_invalidate        = osd_invalidate,
 };
 
 static const struct dt_object_operations osd_obj_otable_it_ops = {
@@ -3587,7 +4542,7 @@ static int osd_index_declare_ea_delete(const struct lu_env *env,
 {
        struct osd_thandle *oh;
        struct inode       *inode;
-       int                 rc;
+       int                 rc, credits;
        ENTRY;
 
        LASSERT(!dt_object_remote(dt));
@@ -3596,16 +4551,22 @@ static int osd_index_declare_ea_delete(const struct lu_env *env,
        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_OBJECT_DELETE]);
+       credits = osd_dto_credits_noquota[DTO_INDEX_DELETE];
+       if (key != NULL && unlikely(strcmp((char *)key, dotdot) == 0)) {
+               /* '..' to a remote object has a local representative */
+               credits += osd_dto_credits_noquota[DTO_INDEX_DELETE];
+               /* to reset LMAI_REMOTE_PARENT */
+               credits += 1;
+       }
+       osd_trans_declare_op(env, oh, OSD_OT_DELETE, credits);
 
        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);
+                                  i_projid_read(inode), 0, oh, osd_dt_obj(dt),
+                                  true, NULL, false);
        RETURN(rc);
 }
 
@@ -3698,7 +4659,7 @@ 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) {
+       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.
@@ -3727,11 +4688,11 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
                                                le32_to_cpu(de->inode));
                        }
                }
-                rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
-                brelse(bh);
-        } 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
@@ -3744,20 +4705,19 @@ static int osd_index_ea_delete(const struct lu_env *env, struct dt_object *dt,
         * /Agent directory, Check whether it needs to delete
         * from agent directory */
        if (unlikely(strcmp((char *)key, dotdot) == 0)) {
-               rc = osd_delete_from_remote_parent(env, osd_obj2dev(obj), obj,
-                                                  oh);
-               if (rc != 0 && rc != -ENOENT) {
-                       CERROR("%s: delete agent inode "DFID": rc = %d\n",
-                              osd_name(osd), PFID(fid), rc);
-               }
-
-               if (rc == -ENOENT)
-                       rc = 0;
-
-               GOTO(out, rc);
+               int ret;
+
+               ret = osd_delete_from_remote_parent(env, osd_obj2dev(obj),
+                                                   obj, oh);
+               if (ret != 0)
+                       /* Sigh, the entry has been deleted, and
+                        * it is not easy to revert it back, so
+                        * let's keep this error private, and let
+                        * LFSCK fix it. XXX */
+                       CERROR("%s: delete remote parent "DFID": rc = %d\n",
+                              osd_name(osd), PFID(fid), ret);
        }
 out:
-
         LASSERT(osd_invariant(obj));
        osd_trans_exec_check(env, handle, OSD_OT_DELETE);
         RETURN(rc);
@@ -3948,7 +4908,8 @@ 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, osd_obj2dev(pobj), 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;
@@ -3956,7 +4917,7 @@ 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) {
@@ -3968,8 +4929,8 @@ static int __osd_ea_add_rec(struct osd_thread_info *info,
                                                        LDISKFS_FT_DIR;
                                ldiskfs_handle_dirty_metadata(oth->ot_handle,
                                                              NULL, bh);
-                               brelse(bh);
                        }
+                       brelse(bh);
                }
        }
 
@@ -4007,7 +4968,7 @@ 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;
                 }
@@ -4099,11 +5060,13 @@ static int
 osd_consistency_check(struct osd_thread_info *oti, struct osd_device *dev,
                      struct osd_idmap_cache *oic)
 {
-       struct osd_scrub    *scrub = &dev->od_scrub;
-       struct lu_fid       *fid   = &oic->oic_fid;
-       struct osd_inode_id *id    = &oti->oti_id;
-       int                  once  = 0;
-       int                  rc;
+       struct osd_scrub *scrub = &dev->od_scrub;
+       struct lu_fid *fid = &oic->oic_fid;
+       struct osd_inode_id *id = &oic->oic_lid;
+       struct inode *inode = NULL;
+       int once  = 0;
+       bool insert;
+       int rc;
        ENTRY;
 
        if (!fid_is_norm(fid) && !fid_is_igif(fid))
@@ -4113,13 +5076,15 @@ osd_consistency_check(struct osd_thread_info *oti, struct osd_device *dev,
                RETURN(0);
 
 again:
-       rc = osd_oi_lookup(oti, dev, fid, id, 0);
+       rc = osd_oi_lookup(oti, dev, fid, &oti->oti_id, 0);
        if (rc == -ENOENT) {
-               struct inode *inode;
+               __u32 gen = id->oii_gen;
 
-               *id = oic->oic_lid;
-               inode = osd_iget(oti, dev, &oic->oic_lid);
+               insert = true;
+               if (inode != NULL)
+                       goto trigger;
 
+               inode = osd_iget(oti, dev, id);
                /* The inode has been removed (by race maybe). */
                if (IS_ERR(inode)) {
                        rc = PTR_ERR(inode);
@@ -4127,21 +5092,33 @@ again:
                        RETURN(rc == -ESTALE ? -ENOENT : rc);
                }
 
-               iput(inode);
                /* The OI mapping is lost. */
-               if (id->oii_gen != OSD_OII_NOGEN)
+               if (gen != OSD_OII_NOGEN)
                        goto trigger;
 
+               iput(inode);
                /* 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)) {
+       } else if (rc != 0 || osd_id_eq(id, &oti->oti_id)) {
                RETURN(rc);
+       } else {
+               insert = false;
        }
 
 trigger:
        if (thread_is_running(&scrub->os_thread)) {
-               rc = osd_oii_insert(dev, oic, rc == -ENOENT);
+               if (inode == NULL) {
+                       inode = osd_iget(oti, dev, id);
+                       /* The inode has been removed (by race maybe). */
+                       if (IS_ERR(inode)) {
+                               rc = PTR_ERR(inode);
+
+                               RETURN(rc == -ESTALE ? -ENOENT : rc);
+                       }
+               }
+
+               rc = osd_oii_insert(dev, oic, insert);
                /* There is race condition between osd_oi_lookup and OI scrub.
                 * The OI scrub finished just after osd_oi_lookup() failure.
                 * Under such case, it is unnecessary to trigger OI scrub again,
@@ -4149,21 +5126,31 @@ trigger:
                if (unlikely(rc == -EAGAIN))
                        goto again;
 
-               RETURN(0);
+               if (!S_ISDIR(inode->i_mode))
+                       rc = 0;
+               else
+                       rc = osd_check_lmv(oti, dev, inode, oic);
+
+               iput(inode);
+               RETURN(rc);
        }
 
        if (!dev->od_noscrub && ++once == 1) {
                rc = osd_scrub_start(dev, SS_AUTO_PARTIAL | SS_CLEAR_DRYRUN |
                                     SS_CLEAR_FAILOUT);
-               CDEBUG(D_LFSCK | D_CONSOLE, "%.16s: trigger OI scrub by RPC "
-                      "for "DFID", rc = %d [2]\n",
+               CDEBUG(D_LFSCK | D_CONSOLE | D_WARNING,
+                      "%.16s: trigger partial OI scrub for RPC inconsistency "
+                      "checking FID "DFID": rc = %d\n",
                       LDISKFS_SB(osd_sb(dev))->s_es->s_volume_name,
                       PFID(fid), rc);
                if (rc == 0 || rc == -EALREADY)
                        goto again;
        }
 
-       RETURN(0);
+       if (inode != NULL)
+               iput(inode);
+
+       RETURN(rc);
 }
 
 static int osd_fail_fid_lookup(struct osd_thread_info *oti,
@@ -4171,9 +5158,9 @@ static int osd_fail_fid_lookup(struct osd_thread_info *oti,
                               struct osd_idmap_cache *oic,
                               struct lu_fid *fid, __u32 ino)
 {
-       struct lustre_mdt_attrs *lma   = &oti->oti_mdt_attrs;
-       struct inode            *inode;
-       int                      rc;
+       struct lustre_ost_attrs *loa = &oti->oti_ost_attrs;
+       struct inode *inode;
+       int rc;
 
        osd_id_gen(&oic->oic_lid, ino, OSD_OII_NOGEN);
        inode = osd_iget(oti, dev, &oic->oic_lid);
@@ -4182,12 +5169,12 @@ static int osd_fail_fid_lookup(struct osd_thread_info *oti,
                return PTR_ERR(inode);
        }
 
-       rc = osd_get_lma(oti, inode, &oti->oti_obj_dentry, lma);
+       rc = osd_get_lma(oti, inode, &oti->oti_obj_dentry, loa);
        iput(inode);
        if (rc != 0)
                fid_zero(&oic->oic_fid);
        else
-               *fid = oic->oic_fid = lma->lma_self_fid;
+               *fid = oic->oic_fid = loa->loa_lma.lma_self_fid;
        return rc;
 }
 
@@ -4269,8 +5256,8 @@ again:
        }
 
        ldata.ld_buf = buf;
-       rc = linkea_init(&ldata);
-       if (rc == 0) {
+       rc = linkea_init_with_rec(&ldata);
+       if (!rc) {
                linkea_first_entry(&ldata);
                linkea_entry_unpack(ldata.ld_lee, &ldata.ld_reclen, NULL, fid);
        }
@@ -4278,6 +5265,48 @@ again:
        RETURN(rc);
 }
 
+static int osd_verify_ent_by_linkea(const struct lu_env *env,
+                                   struct inode *inode,
+                                   const struct lu_fid *pfid,
+                                   const char *name, const int namelen)
+{
+       struct osd_thread_info *oti = osd_oti_get(env);
+       struct lu_buf *buf = &oti->oti_big_buf;
+       struct dentry *dentry = &oti->oti_obj_dentry;
+       struct linkea_data ldata = { NULL };
+       struct lu_name cname = { .ln_name = name,
+                                .ln_namelen = namelen };
+       int rc;
+       ENTRY;
+
+again:
+       rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LINK,
+                            buf->lb_buf, buf->lb_len);
+       if (rc == -ERANGE)
+               rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LINK, NULL, 0);
+
+       if (rc < 0)
+               RETURN(rc);
+
+       if (unlikely(rc == 0))
+               RETURN(-ENODATA);
+
+       if (buf->lb_len < rc) {
+               lu_buf_realloc(buf, rc);
+               if (buf->lb_buf == NULL)
+                       RETURN(-ENOMEM);
+
+               goto again;
+       }
+
+       ldata.ld_buf = buf;
+       rc = linkea_init_with_rec(&ldata);
+       if (!rc)
+               rc = linkea_links_find(&ldata, &cname, pfid);
+
+       RETURN(rc);
+}
+
 /**
  * Calls ->lookup() to find dentry. From dentry get inode and
  * read inode's ea to get fid. This is required for  interoperability
@@ -4314,7 +5343,7 @@ 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;
@@ -4360,7 +5389,7 @@ static int osd_ea_lookup_rec(const struct lu_env *env, struct osd_object *obj,
                if (rc != 0)
                        fid_zero(&oic->oic_fid);
        } else {
-               rc = -ENOENT;
+               rc = PTR_ERR(bh);
        }
 
        GOTO(out, rc);
@@ -4373,76 +5402,6 @@ out:
        return rc;
 }
 
-/**
- * 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
- */
-static inline void osd_object_put(const struct lu_env *env,
-                                  struct osd_object *obj)
-{
-        lu_object_put(env, &obj->oo_dt.do_lu);
-}
-
 static int osd_index_declare_ea_insert(const struct lu_env *env,
                                       struct dt_object *dt,
                                       const struct dt_rec *rec,
@@ -4451,28 +5410,34 @@ 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;
+       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);
 
        credits = osd_dto_credits_noquota[DTO_INDEX_INSERT];
-       if (fid != NULL) {
-               rc = osd_remote_fid(env, osd, fid);
-               if (unlikely(rc < 0))
-                       RETURN(rc);
-               if (rc > 0) {
-                       /* 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];
-               }
-               rc = 0;
+
+       /* 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);
@@ -4484,8 +5449,10 @@ static int osd_index_declare_ea_insert(const struct lu_env *env,
                 * calculate how many blocks will be consumed by this index
                 * insert */
                rc = osd_declare_inode_qid(env, i_uid_read(inode),
-                                          i_gid_read(inode), 0, oh,
-                                          osd_dt_obj(dt), true, NULL, false);
+                                          i_gid_read(inode),
+                                          i_projid_read(inode), 0,
+                                          oh, osd_dt_obj(dt), true,
+                                          NULL, false);
        }
 
        RETURN(rc);
@@ -4513,9 +5480,8 @@ 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;
 
@@ -4530,14 +5496,22 @@ static int osd_index_ea_insert(const struct lu_env *env, struct dt_object *dt,
 
        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;
@@ -4563,15 +5537,23 @@ 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 = igrab(child->oo_inode);
+               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->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);
@@ -4579,9 +5561,8 @@ 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);
@@ -4626,7 +5607,6 @@ static struct dt_it *osd_it_iam_init(const struct lu_env *env,
 /**
  * free given Iterator.
  */
-
 static void osd_it_iam_fini(const struct lu_env *env, struct dt_it *di)
 {
        struct osd_it_iam       *it  = (struct osd_it_iam *)di;
@@ -4634,7 +5614,7 @@ static void osd_it_iam_fini(const struct lu_env *env, struct dt_it *di)
 
        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);
+       osd_object_put(env, obj);
        OBD_FREE_PTR(it);
 }
 
@@ -4939,7 +5919,7 @@ static void osd_it_ea_fini(const struct lu_env *env, struct dt_it *di)
 
        ENTRY;
        oie->oie_file.f_op->release(inode, &oie->oie_file);
-       lu_object_put(env, &obj->oo_dt.do_lu);
+       osd_object_put(env, obj);
        if (unlikely(oie->oie_buf != info->oti_it_ea_buf))
                OBD_FREE(oie->oie_buf, OSD_IT_EA_BUFSIZE);
        else
@@ -4997,11 +5977,16 @@ struct osd_filldir_cbs {
  * \retval 0 on success
  * \retval 1 on buffer full
  */
-static int osd_ldiskfs_filldir(void *buf, const char *name, int namelen,
-                               loff_t offset, __u64 ino,
-                               unsigned d_type)
+#ifdef HAVE_FILLDIR_USE_CTX
+static int osd_ldiskfs_filldir(struct dir_context *buf,
+#else
+static int osd_ldiskfs_filldir(void *buf,
+#endif
+                              const char *name, int namelen,
+                              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;
@@ -5177,14 +6162,10 @@ static int osd_it_ea_key_size(const struct lu_env *env, const struct dt_it *di)
         return it->oie_dirent->oied_namelen;
 }
 
-static inline bool
-osd_dot_dotdot_has_space(struct ldiskfs_dir_entry_2 *de, int dot_dotdot)
+static inline bool osd_dotdot_has_space(struct ldiskfs_dir_entry_2 *de)
 {
-       LASSERTF(dot_dotdot == 1 || dot_dotdot == 2,
-                "dot_dotdot = %d\n", dot_dotdot);
-
        if (LDISKFS_DIR_REC_LEN(de) >=
-           __LDISKFS_DIR_REC_LEN(dot_dotdot + 1 + sizeof(struct osd_fid_pack)))
+           __LDISKFS_DIR_REC_LEN(2 + 1 + sizeof(struct osd_fid_pack)))
                return true;
 
        return false;
@@ -5192,10 +6173,10 @@ osd_dot_dotdot_has_space(struct ldiskfs_dir_entry_2 *de, int dot_dotdot)
 
 static inline bool
 osd_dirent_has_space(struct ldiskfs_dir_entry_2 *de, __u16 namelen,
-                    unsigned blocksize, int dot_dotdot)
+                    unsigned blocksize, bool dotdot)
 {
-       if (dot_dotdot > 0)
-               return osd_dot_dotdot_has_space(de, dot_dotdot);
+       if (dotdot)
+               return osd_dotdot_has_space(de);
 
        if (ldiskfs_rec_len_from_disk(de->rec_len, blocksize) >=
            __LDISKFS_DIR_REC_LEN(namelen + 1 + sizeof(struct osd_fid_pack)))
@@ -5205,10 +6186,11 @@ osd_dirent_has_space(struct ldiskfs_dir_entry_2 *de, __u16 namelen,
 }
 
 static int
-osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
-                   struct dentry *dentry, const struct lu_fid *fid,
-                   struct buffer_head *bh, struct ldiskfs_dir_entry_2 *de,
-                   struct htree_lock *hlock, int dot_dotdot)
+osd_dirent_reinsert(const struct lu_env *env, struct osd_device *dev,
+                   handle_t *jh, struct dentry *dentry,
+                   const struct lu_fid *fid, struct buffer_head *bh,
+                   struct ldiskfs_dir_entry_2 *de, struct htree_lock *hlock,
+                   bool dotdot)
 {
        struct inode                *dir        = dentry->d_parent->d_inode;
        struct inode                *inode      = dentry->d_inode;
@@ -5216,6 +6198,7 @@ osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
        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,
@@ -5223,8 +6206,7 @@ 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, namelen, dir->i_sb->s_blocksize,
-                                dot_dotdot)) {
+       if (osd_dirent_has_space(de, namelen, dir->i_sb->s_blocksize, dotdot)) {
                rc = ldiskfs_journal_get_write_access(jh, bh);
                if (rc != 0)
                        RETURN(rc);
@@ -5239,7 +6221,7 @@ osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
                RETURN(rc);
        }
 
-       LASSERTF(dot_dotdot == 0, "dot_dotdot = %d\n", dot_dotdot);
+       LASSERT(!dotdot);
 
        rc = ldiskfs_delete_entry(jh, dir, de, bh);
        if (rc != 0)
@@ -5249,7 +6231,7 @@ osd_dirent_reinsert(const struct lu_env *env, handle_t *jh,
        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, dev, jh, dentry, inode, hlock);
        /* It is too bad, we cannot reinsert the name entry back.
         * That means we lose it! */
        if (rc != 0)
@@ -5268,11 +6250,10 @@ osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
                        struct osd_inode_id *id, __u32 *attr)
 {
        struct osd_thread_info     *info        = osd_oti_get(env);
-       struct lustre_mdt_attrs    *lma         = &info->oti_mdt_attrs;
+       struct lustre_mdt_attrs    *lma         = &info->oti_ost_attrs.loa_lma;
        struct osd_device          *dev         = osd_obj2dev(obj);
        struct super_block         *sb          = osd_sb(dev);
-       const char                 *devname     =
-                                       LDISKFS_SB(sb)->s_es->s_volume_name;
+       const char                 *devname     = osd_name(dev);
        struct osd_it_ea_dirent    *ent         = it->oie_dirent;
        struct inode               *dir         = obj->oo_inode;
        struct htree_lock          *hlock       = NULL;
@@ -5281,25 +6262,37 @@ osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
        struct ldiskfs_dir_entry_2 *de;
        struct dentry              *dentry;
        struct inode               *inode;
+       const struct lu_fid *pfid = lu_object_fid(&obj->oo_dt.do_lu);
        int                         credits;
        int                         rc;
-       int                         dot_dotdot  = 0;
+       bool                        dotdot      = false;
        bool                        dirty       = false;
        ENTRY;
 
+       if (ent->oied_name[0] == '.') {
+               if (ent->oied_namelen == 1)
+                       RETURN(0);
+
+               if (ent->oied_namelen == 2 && ent->oied_name[1] == '.')
+                       dotdot = true;
+       }
+
        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) {
+                       /* Maybe dangling name entry, or
+                        * corrupted directory entry. */
                        *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",
+                       CDEBUG(D_LFSCK, "%s: fail to iget() for dirent "
+                              "check_repair, dir = %lu/%u, name = %.*s, "
+                              "ino = %llu, rc = %d\n",
                               devname, dir->i_ino, dir->i_generation,
-                              ent->oied_namelen, ent->oied_name, rc);
+                              ent->oied_namelen, ent->oied_name,
+                              ent->oied_ino, rc);
                }
 
                RETURN(rc);
@@ -5307,19 +6300,12 @@ osd_dirent_check_repair(const struct lu_env *env, struct osd_object *obj,
 
        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)
+       rc = osd_get_lma(info, inode, dentry, &info->oti_ost_attrs);
+       if (rc == -ENODATA || !fid_is_sane(&lma->lma_self_fid))
                lma = NULL;
        else if (rc != 0)
                GOTO(out, rc);
 
-       if (ent->oied_name[0] == '.') {
-               if (ent->oied_namelen == 1)
-                       dot_dotdot = 1;
-               else if (ent->oied_namelen == 2 && ent->oied_name[1] == '.')
-                       dot_dotdot = 2;
-       }
-
        /* We need to ensure that the name entry is still valid.
         * Because it may be removed or renamed by other already.
         *
@@ -5342,11 +6328,12 @@ again:
                jh = osd_journal_start_sb(sb, LDISKFS_HT_MISC, credits);
                if (IS_ERR(jh)) {
                        rc = PTR_ERR(jh);
-                       CDEBUG(D_LFSCK, "%.16s: fail to start trans for dirent "
+                       CDEBUG(D_LFSCK, "%s: fail to start trans for dirent "
                               "check_repair, dir = %lu/%u, credits = %d, "
-                              "name = %.*s: rc = %d\n",
+                              "name = %.*s, ino = %llu: rc = %d\n",
                               devname, dir->i_ino, dir->i_generation, credits,
-                              ent->oied_namelen, ent->oied_name, rc);
+                              ent->oied_namelen, ent->oied_name,
+                              ent->oied_ino, rc);
 
                        GOTO(out_inode, rc);
                }
@@ -5372,120 +6359,127 @@ again:
        }
 
        bh = osd_ldiskfs_find_entry(dir, &dentry->d_name, &de, NULL, hlock);
-       /* For dot/dotdot entry, if there is not enough space to hold the
+       if (IS_ERR(bh) || le32_to_cpu(de->inode) != inode->i_ino) {
+               *attr |= LUDA_IGNORE;
+
+               GOTO(out, rc = 0);
+       }
+
+       /* For dotdot entry, if there is not enough space to hold the
         * FID-in-dirent, just keep them there. It only happens when the
         * device upgraded from 1.8 or restored from MDT file-level backup.
-        * For the whole directory, only dot/dotdot entry have no FID-in-dirent
+        * For the whole directory, only 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) != inode->i_ino) ||
-           (dot_dotdot != 0 && !osd_dot_dotdot_has_space(de, dot_dotdot))) {
-               *attr |= LUDA_IGNORE;
+       if (dotdot && !osd_dotdot_has_space(de)) {
+               *attr |= LUDA_UNKNOWN;
 
                GOTO(out, rc = 0);
        }
 
        if (lma != NULL) {
+               if (lu_fid_eq(fid, &lma->lma_self_fid))
+                       GOTO(out, rc = 0);
+
                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 "
+                       if (likely(dotdot &&
+                                  fid_seq(tfid) == FID_SEQ_LOCAL_FILE &&
+                                  fid_oid(tfid) == REMOTE_PARENT_DIR_OID)) {
+                               /* It must be REMOTE_PARENT_DIR and as the
+                                * 'dotdot' entry of remote directory */
+                               *attr |= LUDA_IGNORE;
+                       } else {
+                               CDEBUG(D_LFSCK, "%s: 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);
+                               *attr |= LUDA_UNKNOWN;
                        }
 
                        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, rc = 0);
-
-                       /* Do not repair under dryrun mode. */
-                       if (*attr & LUDA_VERIFY_DRYRUN) {
-                               *attr |= LUDA_REPAIR;
+       if (!fid_is_zero(fid)) {
+               rc = osd_verify_ent_by_linkea(env, inode, pfid, ent->oied_name,
+                                             ent->oied_namelen);
+               if (rc == -ENOENT ||
+                   (rc == -ENODATA &&
+                    !(dev->od_scrub.os_file.sf_flags & SF_UPGRADE))) {
+                       /* linkEA does not recognize the dirent entry,
+                        * it may because the dirent entry corruption
+                        * and points to other's inode. */
+                       CDEBUG(D_LFSCK, "%s: the target inode does not "
+                              "recognize the dirent, dir = %lu/%u, "
+                              " name = %.*s, ino = %llu, "
+                              DFID": rc = %d\n", devname, dir->i_ino,
+                              dir->i_generation, ent->oied_namelen,
+                              ent->oied_name, ent->oied_ino, PFID(fid), rc);
+                       *attr |= LUDA_UNKNOWN;
 
-                               GOTO(out, rc = 0);
-                       }
+                       GOTO(out, rc = 0);
+               }
 
-                       if (jh == NULL) {
-                               brelse(bh);
-                               if (hlock != NULL)
-                                       ldiskfs_htree_unlock(hlock);
-                               else
-                                       up_read(&obj->oo_ext_idx_sem);
-                               dev->od_dirent_journal = 1;
+               if (rc && rc != -ENODATA) {
+                       CDEBUG(D_LFSCK, "%s: fail to verify FID in the dirent, "
+                              "dir = %lu/%u, name = %.*s, ino = %llu, "
+                              DFID": rc = %d\n", devname, dir->i_ino,
+                              dir->i_generation, ent->oied_namelen,
+                              ent->oied_name, ent->oied_ino, PFID(fid), rc);
+                       *attr |= LUDA_UNKNOWN;
 
-                               goto again;
-                       }
+                       GOTO(out, rc = 0);
+               }
+       }
 
+       if (lma != NULL) {
+               /* linkEA recognizes the dirent entry, the FID-in-LMA is
+                * valid, trusted, in spite of fid_is_sane(fid) or not. */
+               if (*attr & LUDA_VERIFY_DRYRUN) {
                        *fid = lma->lma_self_fid;
-                       dirty = true;
-                       /* Update the FID-in-dirent. */
-                       rc = osd_dirent_reinsert(env, jh, dentry, fid, bh, de,
-                                                hlock, dot_dotdot);
-                       if (rc == 0)
-                               *attr |= LUDA_REPAIR;
-                       else
-                               CDEBUG(D_LFSCK, "%.16s: fail to update FID "
-                                      "in the dirent, dir = %lu/%u, "
-                                      "name = %.*s, "DFID": rc = %d\n",
-                                      devname, dir->i_ino, dir->i_generation,
-                                      ent->oied_namelen, ent->oied_name,
-                                      PFID(fid), rc);
-               } else {
-                       /* Do not repair under dryrun mode. */
-                       if (*attr & LUDA_VERIFY_DRYRUN) {
-                               *fid = lma->lma_self_fid;
-                               *attr |= LUDA_REPAIR;
-
-                               GOTO(out, rc = 0);
-                       }
+                       *attr |= LUDA_REPAIR;
 
-                       if (jh == NULL) {
-                               brelse(bh);
-                               if (hlock != NULL)
-                                       ldiskfs_htree_unlock(hlock);
-                               else
-                                       up_read(&obj->oo_ext_idx_sem);
-                               dev->od_dirent_journal = 1;
+                       GOTO(out, rc = 0);
+               }
 
-                               goto again;
+               if (jh == NULL) {
+                       brelse(bh);
+                       dev->od_dirent_journal = 1;
+                       if (hlock != NULL) {
+                               ldiskfs_htree_unlock(hlock);
+                               hlock = NULL;
+                       } else {
+                               up_read(&obj->oo_ext_idx_sem);
                        }
 
-                       *fid = lma->lma_self_fid;
-                       dirty = true;
-                       /* Append the FID-in-dirent. */
-                       rc = osd_dirent_reinsert(env, jh, dentry, fid, bh, de,
-                                                hlock, dot_dotdot);
-                       if (rc == 0)
-                               *attr |= LUDA_REPAIR;
-                       else
-                               CDEBUG(D_LFSCK, "%.16s: fail to append FID "
-                                      "after the dirent, dir = %lu/%u, "
-                                      "name = %.*s, "DFID": rc = %d\n",
-                                      devname, dir->i_ino, dir->i_generation,
-                                      ent->oied_namelen, ent->oied_name,
-                                      PFID(fid), rc);
+                       goto again;
                }
+
+               *fid = lma->lma_self_fid;
+               dirty = true;
+               /* Update or append the FID-in-dirent. */
+               rc = osd_dirent_reinsert(env, dev, jh, dentry, fid,
+                                        bh, de, hlock, dotdot);
+               if (rc == 0)
+                       *attr |= LUDA_REPAIR;
+               else
+                       CDEBUG(D_LFSCK, "%s: fail to re-insert FID after "
+                              "the dirent, dir = %lu/%u, name = %.*s, "
+                              "ino = %llu, "DFID": rc = %d\n",
+                              devname, dir->i_ino, dir->i_generation,
+                              ent->oied_namelen, ent->oied_name,
+                              ent->oied_ino, PFID(fid), rc);
        } else {
-               /* Do not repair under dryrun mode. */
+               /* lma is NULL, trust the FID-in-dirent if it is valid. */
                if (*attr & LUDA_VERIFY_DRYRUN) {
                        if (fid_is_sane(fid)) {
                                *attr |= LUDA_REPAIR;
-                       } else {
+                       } else if (dev->od_index == 0) {
                                lu_igif_build(fid, inode->i_ino,
                                              inode->i_generation);
                                *attr |= LUDA_UPGRADE;
@@ -5496,11 +6490,13 @@ again:
 
                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;
                }
@@ -5513,34 +6509,37 @@ again:
                        if (rc == 0)
                                *attr |= LUDA_REPAIR;
                        else
-                               CDEBUG(D_LFSCK, "%.16s: fail to set LMA for "
+                               CDEBUG(D_LFSCK, "%s: fail to set LMA for "
                                       "update dirent, dir = %lu/%u, "
-                                      "name = %.*s, "DFID": rc = %d\n",
+                                      "name = %.*s, ino = %llu, "
+                                      DFID": rc = %d\n",
                                       devname, dir->i_ino, dir->i_generation,
                                       ent->oied_namelen, ent->oied_name,
-                                      PFID(fid), rc);
-               } else {
+                                      ent->oied_ino, PFID(fid), rc);
+               } else if (dev->od_index == 0) {
                        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, dentry, fid, bh, de,
-                                                hlock, dot_dotdot);
+                       rc = osd_dirent_reinsert(env, dev, jh, dentry, fid,
+                                                bh, de, hlock, dotdot);
                        if (rc == 0)
                                *attr |= LUDA_UPGRADE;
                        else
-                               CDEBUG(D_LFSCK, "%.16s: fail to append IGIF "
+                               CDEBUG(D_LFSCK, "%s: fail to append IGIF "
                                       "after the dirent, dir = %lu/%u, "
-                                      "name = %.*s, "DFID": rc = %d\n",
+                                      "name = %.*s, ino = %llu, "
+                                      DFID": rc = %d\n",
                                       devname, dir->i_ino, dir->i_generation,
                                       ent->oied_namelen, ent->oied_name,
-                                      PFID(fid), rc);
+                                      ent->oied_ino, PFID(fid), rc);
                }
        }
 
        GOTO(out, rc);
 
 out:
-       brelse(bh);
+       if (!IS_ERR(bh))
+               brelse(bh);
        if (hlock != NULL) {
                ldiskfs_htree_unlock(hlock);
        } else {
@@ -5604,10 +6603,8 @@ static inline int osd_it_ea_rec(const struct lu_env *env,
                                                     &attr);
                }
 
-               if (!fid_is_sane(fid)) {
-                       attr &= ~LUDA_IGNORE;
+               if (!fid_is_sane(fid))
                        attr |= LUDA_UNKNOWN;
-               }
        } else {
                attr &= ~LU_DIRENT_ATTRS_MASK;
                if (!fid_is_sane(fid)) {
@@ -5798,15 +6795,23 @@ 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(info->oti_inode);
+               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);
 }
 
@@ -5931,7 +6936,7 @@ 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, force_over_128tb = 0;
+       int                      rc = 0, force_over_512tb = 0;
         ENTRY;
 
        if (o->od_mnt != NULL)
@@ -5955,10 +6960,27 @@ static int osd_mount(const struct lu_env *env,
                RETURN(-EINVAL);
        }
 #endif
-       if (opts != NULL && strstr(opts, "force_over_128tb") != NULL)
-               force_over_128tb = 1;
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
+       if (opts != NULL && strstr(opts, "force_over_128tb") != NULL) {
+               CWARN("force_over_128tb option is deprecated. "
+                     "Filesystems less than 512TB can be created without any "
+                     "force options. Use force_over_512tb option for "
+                     "filesystems greater than 512TB.\n");
+       }
+#endif
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 1, 53, 0)
+       if (opts != NULL && strstr(opts, "force_over_256tb") != NULL) {
+               CWARN("force_over_256tb option is deprecated. "
+                     "Filesystems less than 512TB can be created without any "
+                     "force options. Use force_over_512tb option for "
+                     "filesystems greater than 512TB.\n");
+       }
+#endif
+
+       if (opts != NULL && strstr(opts, "force_over_512tb") != NULL)
+               force_over_512tb = 1;
 
-       __page = alloc_page(GFP_IOFS);
+       __page = alloc_page(GFP_KERNEL);
        if (__page == NULL)
                GOTO(out, rc = -ENOMEM);
        page = (unsigned long)page_address(__page);
@@ -5976,6 +6998,8 @@ static int osd_mount(const struct lu_env *env,
                        /* strip out option we processed in osd */
                        "bigendian_extents",
                        "force_over_128tb",
+                       "force_over_256tb",
+                       "force_over_512tb",
                        NULL
                };
                strcat(options, opts);
@@ -6003,7 +7027,7 @@ static int osd_mount(const struct lu_env *env,
        /* Glom up mount options */
        if (*options != '\0')
                strcat(options, ",");
-       strlcat(options, "no_mbcache", PAGE_CACHE_SIZE);
+       strlcat(options, "no_mbcache,nodelalloc", PAGE_SIZE);
 
        type = get_fs_type("ldiskfs");
        if (!type) {
@@ -6021,22 +7045,37 @@ static int osd_mount(const struct lu_env *env,
                GOTO(out, rc);
        }
 
-       if (ldiskfs_blocks_count(LDISKFS_SB(osd_sb(o))->s_es) > (8ULL << 32) &&
-           force_over_128tb == 0) {
+       if (ldiskfs_blocks_count(LDISKFS_SB(osd_sb(o))->s_es) <<
+                                osd_sb(o)->s_blocksize_bits > 512ULL << 40 &&
+                                force_over_512tb == 0) {
                CERROR("%s: device %s LDISKFS does not support filesystems "
-                      "greater than 128TB and can cause data corruption. "
-                      "Use \"force_over_128tb\" mount option to override.\n",
+                      "greater than 512TB and can cause data corruption. "
+                      "Use \"force_over_512tb\" mount option to override.\n",
                       name, dev);
-               GOTO(out, rc = -EINVAL);
+               GOTO(out_mnt, rc = -EINVAL);
        }
 
+       if (lmd_flags & LMD_FLG_DEV_RDONLY) {
 #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. "
-                      "Setup failed\n", name, dev);
-               GOTO(out_mnt, rc = -EROFS);
-       }
+               dev_set_rdonly(osd_sb(o)->s_bdev);
+               o->od_dt_dev.dd_rdonly = 1;
+               LCONSOLE_WARN("%s: set dev_rdonly on this device\n", name);
+#else
+               LCONSOLE_WARN("%s: not support dev_rdonly on this device",
+                             name);
+
+               GOTO(out_mnt, rc = -EOPNOTSUPP);
+#endif
+       } else {
+#ifdef HAVE_DEV_SET_RDONLY
+               if (dev_check_rdonly(osd_sb(o)->s_bdev)) {
+                       CERROR("%s: underlying device %s is marked as "
+                              "read-only. Setup failed\n", name, dev);
+
+                       GOTO(out_mnt, rc = -EROFS);
+               }
 #endif
+       }
 
        if (!LDISKFS_HAS_COMPAT_FEATURE(o->od_mnt->mnt_sb,
                                        LDISKFS_FEATURE_COMPAT_HAS_JOURNAL)) {