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LU-2875 mdt: use lu_name for rr_name and rr_tgt
[fs/lustre-release.git] / lustre / mdt / mdt_handler.c
index 78d994c..bd23719 100644 (file)
@@ -62,7 +62,6 @@
 /* lu2dt_dev() */
 #include <dt_object.h>
 #include <lustre_mds.h>
-#include <lustre_mdt.h>
 #include <lustre_log.h>
 #include "mdt_internal.h"
 #include <lustre_acl.h>
@@ -99,7 +98,13 @@ static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
 static const struct lu_object_operations mdt_obj_ops;
 
 /* Slab for MDT object allocation */
-static cfs_mem_cache_t *mdt_object_kmem;
+static struct kmem_cache *mdt_object_kmem;
+
+/* For HSM restore handles */
+struct kmem_cache *mdt_hsm_cdt_kmem;
+
+/* For HSM request handles */
+struct kmem_cache *mdt_hsm_car_kmem;
 
 static struct lu_kmem_descr mdt_caches[] = {
        {
@@ -108,6 +113,16 @@ static struct lu_kmem_descr mdt_caches[] = {
                .ckd_size  = sizeof(struct mdt_object)
        },
        {
+               .ckd_cache      = &mdt_hsm_cdt_kmem,
+               .ckd_name       = "mdt_cdt_restore_handle",
+               .ckd_size       = sizeof(struct cdt_restore_handle)
+       },
+       {
+               .ckd_cache      = &mdt_hsm_car_kmem,
+               .ckd_name       = "mdt_cdt_agent_req",
+               .ckd_size       = sizeof(struct cdt_agent_req)
+       },
+       {
                .ckd_cache = NULL
        }
 };
@@ -120,21 +135,25 @@ int mdt_get_disposition(struct ldlm_reply *rep, int flag)
 }
 
 void mdt_clear_disposition(struct mdt_thread_info *info,
-                           struct ldlm_reply *rep, int flag)
+                          struct ldlm_reply *rep, int flag)
 {
-        if (info)
-                info->mti_opdata &= ~flag;
-        if (rep)
-                rep->lock_policy_res1 &= ~flag;
+       if (info) {
+               info->mti_opdata &= ~flag;
+               tgt_opdata_clear(info->mti_env, flag);
+       }
+       if (rep)
+               rep->lock_policy_res1 &= ~flag;
 }
 
 void mdt_set_disposition(struct mdt_thread_info *info,
-                         struct ldlm_reply *rep, int flag)
+                        struct ldlm_reply *rep, int flag)
 {
-        if (info)
-                info->mti_opdata |= flag;
-        if (rep)
-                rep->lock_policy_res1 |= flag;
+       if (info) {
+               info->mti_opdata |= flag;
+               tgt_opdata_set(info->mti_env, flag);
+       }
+       if (rep)
+               rep->lock_policy_res1 |= flag;
 }
 
 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
@@ -145,27 +164,28 @@ void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
         lh->mlh_type = MDT_REG_LOCK;
 }
 
-void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lm,
-                       const char *name, int namelen)
+void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
+                      const struct lu_name *lname)
 {
-        lh->mlh_reg_mode = lm;
-       lh->mlh_rreg_mode = lm;
-        lh->mlh_type = MDT_PDO_LOCK;
+       lh->mlh_reg_mode = lock_mode;
+       lh->mlh_rreg_mode = lock_mode;
+       lh->mlh_type = MDT_PDO_LOCK;
 
-        if (name != NULL && (name[0] != '\0')) {
-                LASSERT(namelen > 0);
-                lh->mlh_pdo_hash = full_name_hash(name, namelen);
+       if (lu_name_is_valid(lname)) {
+               lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
+                                                 lname->ln_namelen);
                /* XXX Workaround for LU-2856
-                * Zero is a valid return value of full_name_hash, but several
-                * users of mlh_pdo_hash assume a non-zero hash value. We
-                * therefore map zero onto an arbitrary, but consistent
-                * value (1) to avoid problems further down the road. */
-               if (unlikely(!lh->mlh_pdo_hash))
+                *
+                * Zero is a valid return value of full_name_hash, but
+                * several users of mlh_pdo_hash assume a non-zero
+                * hash value. We therefore map zero onto an
+                * arbitrary, but consistent value (1) to avoid
+                * problems further down the road. */
+               if (unlikely(lh->mlh_pdo_hash == 0))
                        lh->mlh_pdo_hash = 1;
-        } else {
-                LASSERT(namelen == 0);
-                lh->mlh_pdo_hash = 0ull;
-        }
+       } else {
+               lh->mlh_pdo_hash = 0;
+       }
 }
 
 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
@@ -243,32 +263,34 @@ static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o
         EXIT;
 }
 
-int mdt_getstatus(struct mdt_thread_info *info)
+int mdt_getstatus(struct tgt_session_info *tsi)
 {
-       struct mdt_device       *mdt  = info->mti_mdt;
+       struct mdt_thread_info  *info = tsi2mdt_info(tsi);
+       struct mdt_device       *mdt = info->mti_mdt;
        struct mdt_body         *repbody;
-       int                     rc;
+       int                      rc;
+
        ENTRY;
 
-        rc = mdt_check_ucred(info);
-        if (rc)
-                RETURN(err_serious(rc));
+       rc = mdt_check_ucred(info);
+       if (rc)
+               GOTO(out, rc = err_serious(rc));
 
-        if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
-                RETURN(err_serious(-ENOMEM));
+       if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
+               GOTO(out, rc = err_serious(-ENOMEM));
 
        repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
        repbody->fid1 = mdt->mdt_md_root_fid;
-        repbody->valid |= OBD_MD_FLID;
+       repbody->valid |= OBD_MD_FLID;
 
-        if (mdt->mdt_opts.mo_mds_capa &&
+       if (tsi->tsi_tgt->lut_mds_capa &&
            exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
-                struct mdt_object  *root;
-                struct lustre_capa *capa;
+               struct mdt_object       *root;
+               struct lustre_capa      *capa;
 
-                root = mdt_object_find(info->mti_env, mdt, &repbody->fid1);
-                if (IS_ERR(root))
-                        RETURN(PTR_ERR(root));
+               root = mdt_object_find(info->mti_env, mdt, &repbody->fid1);
+               if (IS_ERR(root))
+                       GOTO(out, rc = PTR_ERR(root));
 
                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
                 LASSERT(capa);
@@ -279,13 +301,16 @@ int mdt_getstatus(struct mdt_thread_info *info)
                 if (rc == 0)
                         repbody->valid |= OBD_MD_FLMDSCAPA;
         }
-
-        RETURN(rc);
+       EXIT;
+out:
+       mdt_thread_info_fini(info);
+       return rc;
 }
 
-int mdt_statfs(struct mdt_thread_info *info)
+int mdt_statfs(struct tgt_session_info *tsi)
 {
-       struct ptlrpc_request           *req = mdt_info_req(info);
+       struct ptlrpc_request           *req = tgt_ses_req(tsi);
+       struct mdt_thread_info          *info = tsi2mdt_info(tsi);
        struct md_device                *next = info->mti_mdt->mdt_child;
        struct ptlrpc_service_part      *svcpt;
        struct obd_statfs               *osfs;
@@ -293,23 +318,23 @@ int mdt_statfs(struct mdt_thread_info *info)
 
        ENTRY;
 
-       svcpt = info->mti_pill->rc_req->rq_rqbd->rqbd_svcpt;
+       svcpt = req->rq_rqbd->rqbd_svcpt;
 
        /* This will trigger a watchdog timeout */
        OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
                         (MDT_SERVICE_WATCHDOG_FACTOR *
                          at_get(&svcpt->scp_at_estimate)) + 1);
 
-        rc = mdt_check_ucred(info);
-        if (rc)
-                RETURN(err_serious(rc));
+       rc = mdt_check_ucred(info);
+       if (rc)
+               GOTO(out, rc = err_serious(rc));
 
        if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
-               RETURN(err_serious(-ENOMEM));
+               GOTO(out, rc = err_serious(-ENOMEM));
 
        osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
        if (!osfs)
-               RETURN(-EPROTO);
+               GOTO(out, rc = -EPROTO);
 
        /** statfs information are cached in the mdt_device */
        if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
@@ -317,7 +342,7 @@ int mdt_statfs(struct mdt_thread_info *info)
                /** statfs data is too old, get up-to-date one */
                rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
                if (rc)
-                       RETURN(rc);
+                       GOTO(out, rc);
                spin_lock(&info->mti_mdt->mdt_osfs_lock);
                info->mti_mdt->mdt_osfs = *osfs;
                info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
@@ -331,7 +356,8 @@ int mdt_statfs(struct mdt_thread_info *info)
 
        if (rc == 0)
                mdt_counter_incr(req, LPROC_MDT_STATFS);
-
+out:
+       mdt_thread_info_fini(info);
        RETURN(rc);
 }
 
@@ -396,7 +422,18 @@ void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
                 b->blocks = 0;
                 /* if no object is allocated on osts, the size on mds is valid. b=22272 */
                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
-        }
+       } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
+                  ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
+               /* A released file stores its size on MDS. */
+               /* But return 1 block for released file, unless tools like tar
+                * will consider it fully sparse. (LU-3864)
+                */
+               if (unlikely(b->size == 0))
+                       b->blocks = 0;
+               else
+                       b->blocks = 1;
+               b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
+       }
 
         if (fid) {
                 b->fid1 = *fid;
@@ -408,7 +445,7 @@ void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
         if (info)
                 mdt_body_reverse_idmap(info, b);
 
-        if (b->valid & OBD_MD_FLSIZE)
+       if (fid != NULL && (b->valid & OBD_MD_FLSIZE))
                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
                        PFID(fid), (unsigned long long)b->size);
 }
@@ -734,12 +771,19 @@ static int mdt_getattr_internal(struct mdt_thread_info *info,
                RETURN(rc);
        }
 
+       /* if file is released, check if a restore is running */
+       if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
+           mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
+               repbody->t_state = MS_RESTORE;
+               repbody->valid |= OBD_MD_TSTATE;
+       }
+
        is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
 
        /* the Lustre protocol supposes to return default striping
         * on the user-visible root if explicitly requested */
        if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
-           (ma->ma_need & MA_LOV_DEF && is_root) && (ma->ma_need & MA_LOV)) {
+           (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
                struct lu_fid      rootfid;
                struct mdt_object *root;
                struct mdt_device *mdt = info->mti_mdt;
@@ -793,7 +837,7 @@ static int mdt_getattr_internal(struct mdt_thread_info *info,
                               PFID(mdt_object_fid(o)), rc);
                        rc = -EFAULT;
                } else {
-                       int print_limit = min_t(int, CFS_PAGE_SIZE - 128, rc);
+                       int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
 
                        if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
                                rc -= 2;
@@ -876,7 +920,7 @@ static int mdt_getattr_internal(struct mdt_thread_info *info,
 #endif
 
        if (reqbody->valid & OBD_MD_FLMDSCAPA &&
-           info->mti_mdt->mdt_opts.mo_mds_capa &&
+           info->mti_mdt->mdt_lut.lut_mds_capa &&
            exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
                 struct lustre_capa *capa;
 
@@ -908,7 +952,7 @@ static int mdt_renew_capa(struct mdt_thread_info *info)
          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
          * flag not set.
          */
-       if (!obj || !info->mti_mdt->mdt_opts.mo_oss_capa ||
+       if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
            !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
                RETURN(0);
 
@@ -928,8 +972,9 @@ static int mdt_renew_capa(struct mdt_thread_info *info)
         RETURN(rc);
 }
 
-int mdt_getattr(struct mdt_thread_info *info)
+int mdt_getattr(struct tgt_session_info *tsi)
 {
+       struct mdt_thread_info  *info = tsi2mdt_info(tsi);
         struct mdt_object       *obj = info->mti_object;
         struct req_capsule      *pill = info->mti_pill;
         struct mdt_body         *reqbody;
@@ -950,19 +995,19 @@ int mdt_getattr(struct mdt_thread_info *info)
         }
 
         LASSERT(obj != NULL);
-        LASSERT(lu_object_assert_exists(&obj->mot_obj.mo_lu));
+       LASSERT(lu_object_assert_exists(&obj->mot_obj));
 
-        mode = lu_object_attr(&obj->mot_obj.mo_lu);
+       mode = lu_object_attr(&obj->mot_obj);
 
-        /* old clients may not report needed easize, use max value then */
-        req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
-                             reqbody->eadatasize == 0 ?
-                             info->mti_mdt->mdt_max_mdsize :
-                             reqbody->eadatasize);
+       /* old clients may not report needed easize, use max value then */
+       req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
+                            reqbody->eadatasize == 0 ?
+                            info->mti_mdt->mdt_max_mdsize :
+                            reqbody->eadatasize);
 
-        rc = req_capsule_server_pack(pill);
-        if (unlikely(rc != 0))
-                RETURN(err_serious(rc));
+       rc = req_capsule_server_pack(pill);
+       if (unlikely(rc != 0))
+               GOTO(out, rc = err_serious(rc));
 
         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
         LASSERT(repbody != NULL);
@@ -992,11 +1037,14 @@ out_shrink:
         rc2 = mdt_fix_reply(info);
         if (rc == 0)
                 rc = rc2;
-        return rc;
+out:
+       mdt_thread_info_fini(info);
+       return rc;
 }
 
-int mdt_is_subdir(struct mdt_thread_info *info)
+int mdt_is_subdir(struct tgt_session_info *tsi)
 {
+       struct mdt_thread_info  *info = tsi2mdt_info(tsi);
         struct mdt_object     *o = info->mti_object;
         struct req_capsule    *pill = info->mti_pill;
         const struct mdt_body *body = info->mti_body;
@@ -1019,12 +1067,14 @@ int mdt_is_subdir(struct mdt_thread_info *info)
        if (rc == 0 || rc == -EREMOTE)
                repbody->valid |= OBD_MD_FLID;
 
+       mdt_thread_info_fini(info);
        RETURN(rc);
 }
 
-int mdt_swap_layouts(struct mdt_thread_info *info)
+int mdt_swap_layouts(struct tgt_session_info *tsi)
 {
-       struct ptlrpc_request   *req = mdt_info_req(info);
+       struct mdt_thread_info  *info;
+       struct ptlrpc_request   *req = tgt_ses_req(tsi);
        struct obd_export       *exp = req->rq_export;
        struct mdt_object       *o1, *o2, *o;
        struct mdt_lock_handle  *lh1, *lh2;
@@ -1042,6 +1092,7 @@ int mdt_swap_layouts(struct mdt_thread_info *info)
        if (!exp_connect_layout(exp))
                RETURN(-EOPNOTSUPP);
 
+       info = tsi2mdt_info(tsi);
        if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
                mdt_set_capainfo(info, 0, &info->mti_body->fid1,
                                 req_capsule_client_get(info->mti_pill,
@@ -1089,13 +1140,13 @@ int mdt_swap_layouts(struct mdt_thread_info *info)
        lh2 = &info->mti_lh[MDT_LH_OLD];
        mdt_lock_reg_init(lh2, LCK_EX);
 
-       rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT,
-                            MDT_LOCAL_LOCK);
+       rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
+                            MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
        if (rc < 0)
                GOTO(put, rc);
 
-       rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT,
-                            MDT_LOCAL_LOCK);
+       rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
+                            MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
        if (rc < 0)
                GOTO(unlock1, rc);
 
@@ -1109,6 +1160,7 @@ unlock1:
 put:
        mdt_object_put(info->mti_env, o);
 out:
+       mdt_thread_info_fini(info);
        RETURN(rc);
 }
 
@@ -1170,8 +1222,6 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
         struct md_object       *next      = mdt_object_child(parent);
         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
         struct lu_name         *lname     = NULL;
-        const char             *name      = NULL;
-        int                     namelen   = 0;
         struct mdt_lock_handle *lhp       = NULL;
         struct ldlm_lock       *lock;
         struct ldlm_res_id     *res_id;
@@ -1186,45 +1236,42 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
 
         LASSERT(parent != NULL);
-        name = req_capsule_client_get(info->mti_pill, &RMF_NAME);
-        if (name == NULL)
-                RETURN(err_serious(-EFAULT));
 
-        namelen = req_capsule_get_size(info->mti_pill, &RMF_NAME,
-                                       RCL_CLIENT) - 1;
-        if (!info->mti_cross_ref) {
-                /*
-                 * XXX: Check for "namelen == 0" is for getattr by fid
-                 * (OBD_CONNECT_ATTRFID), otherwise do not allow empty name,
-                 * that is the name must contain at least one character and
-                 * the terminating '\0'
-                 */
-                if (namelen == 0) {
-                        reqbody = req_capsule_client_get(info->mti_pill,
-                                                         &RMF_MDT_BODY);
-                        if (unlikely(reqbody == NULL))
-                                RETURN(err_serious(-EFAULT));
-
-                        if (unlikely(!fid_is_sane(&reqbody->fid2)))
-                                RETURN(err_serious(-EINVAL));
-
-                        name = NULL;
-                        CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
-                               "ldlm_rep = %p\n",
-                               PFID(mdt_object_fid(parent)),
-                               PFID(&reqbody->fid2), ldlm_rep);
-                } else {
-                        lname = mdt_name(info->mti_env, (char *)name, namelen);
-                        CDEBUG(D_INODE, "getattr with lock for "DFID"/%s, "
-                               "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
-                               name, ldlm_rep);
-                }
-        }
+       lname = &info->mti_name;
+       mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
+
+       if (!info->mti_cross_ref) {
+               /*
+                * XXX: Check for anonymous name is for getattr by fid
+                * (OBD_CONNECT_ATTRFID), otherwise do not allow empty name,
+                * that is the name must contain at least one character and
+                * the terminating '\0'.
+                */
+               if (!lu_name_is_valid(lname)) {
+                       reqbody = req_capsule_client_get(info->mti_pill,
+                                                        &RMF_MDT_BODY);
+                       if (unlikely(reqbody == NULL))
+                               RETURN(err_serious(-EFAULT));
+
+                       if (unlikely(!fid_is_sane(&reqbody->fid2)))
+                               RETURN(err_serious(-EINVAL));
+
+                       CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
+                              "ldlm_rep = %p\n",
+                              PFID(mdt_object_fid(parent)),
+                              PFID(&reqbody->fid2), ldlm_rep);
+               } else {
+                       CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
+                              "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
+                              PNAME(lname), ldlm_rep);
+               }
+       }
+
         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
 
-       if (unlikely(!mdt_object_exists(parent))) {
+       if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
                LU_OBJECT_DEBUG(D_INODE, info->mti_env,
-                               &parent->mot_obj.mo_lu,
+                               &parent->mot_obj,
                                "Parent doesn't exist!\n");
                RETURN(-ESTALE);
        } else if (!info->mti_cross_ref) {
@@ -1232,7 +1279,8 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                         "Parent "DFID" is on remote server\n",
                         PFID(mdt_object_fid(parent)));
        }
-        if (lname) {
+
+       if (lu_name_is_valid(lname)) {
                 rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
                 if (rc != 0) {
                         if (rc > 0)
@@ -1258,21 +1306,30 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                         LDLM_LOCK_PUT(lock);
                         rc = 0;
                 } else {
-                        mdt_lock_handle_init(lhc);
-                        mdt_lock_reg_init(lhc, LCK_PR);
-
-                        /*
-                         * Object's name is on another MDS, no lookup lock is
-                         * needed here but update is.
-                         */
-                        child_bits &= ~MDS_INODELOCK_LOOKUP;
+                       mdt_lock_handle_init(lhc);
+                       mdt_lock_reg_init(lhc, LCK_PR);
+
+                       /*
+                        * Object's name is on another MDS, no lookup or layout
+                        * lock is needed here but update lock is.
+                        */
+                       child_bits &= ~(MDS_INODELOCK_LOOKUP |
+                                       MDS_INODELOCK_LAYOUT);
                        child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
 
                        rc = mdt_object_lock(info, child, lhc, child_bits,
-                                             MDT_LOCAL_LOCK);
-                }
+                                            MDT_LOCAL_LOCK);
+               }
                 if (rc == 0) {
                         /* Finally, we can get attr for child. */
+                       if (!mdt_object_exists(child)) {
+                               LU_OBJECT_DEBUG(D_INFO, info->mti_env,
+                                               &child->mot_obj,
+                                            "remote object doesn't exist.\n");
+                                mdt_object_unlock(info, child, lhc, 1);
+                               RETURN(-ENOENT);
+                       }
+
                         mdt_set_capainfo(info, 0, mdt_object_fid(child),
                                          BYPASS_CAPA);
                         rc = mdt_getattr_internal(info, child, 0);
@@ -1282,11 +1339,11 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                 RETURN(rc);
         }
 
-        if (lname) {
-                /* step 1: lock parent only if parent is a directory */
-                if (S_ISDIR(lu_object_attr(&parent->mot_obj.mo_lu))) {
-                        lhp = &info->mti_lh[MDT_LH_PARENT];
-                        mdt_lock_pdo_init(lhp, LCK_PR, name, namelen);
+       if (lu_name_is_valid(lname)) {
+               /* step 1: lock parent only if parent is a directory */
+               if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
+                       lhp = &info->mti_lh[MDT_LH_PARENT];
+                       mdt_lock_pdo_init(lhp, LCK_PR, lname);
                         rc = mdt_object_lock(info, parent, lhp,
                                              MDS_INODELOCK_UPDATE,
                                              MDT_LOCAL_LOCK);
@@ -1311,41 +1368,50 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
         }
 
-        /*
-         *step 3: find the child object by fid & lock it.
-         *        regardless if it is local or remote.
-         */
-        child = mdt_object_find(info->mti_env, info->mti_mdt, child_fid);
-
-        if (unlikely(IS_ERR(child)))
-                GOTO(out_parent, rc = PTR_ERR(child));
-        if (is_resent) {
-                /* Do not take lock for resent case. */
-                lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
-                LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
-                         lhc->mlh_reg_lh.cookie);
-
-                res_id = &lock->l_resource->lr_name;
-                if (!fid_res_name_eq(mdt_object_fid(child),
-                                    &lock->l_resource->lr_name)) {
-                         LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
-                                                 &lock->l_resource->lr_name),
-                                 "Lock res_id: %lu/%lu/%lu, Fid: "DFID".\n",
-                                 (unsigned long)res_id->name[0],
-                                 (unsigned long)res_id->name[1],
-                                 (unsigned long)res_id->name[2],
-                                 PFID(mdt_object_fid(parent)));
-                          CWARN("Although resent, but still not get child lock"
-                                "parent:"DFID" child:"DFID"\n",
-                                PFID(mdt_object_fid(parent)),
-                                PFID(mdt_object_fid(child)));
-                          lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
-                          LDLM_LOCK_PUT(lock);
-                          GOTO(relock, 0);
-                }
-                LDLM_LOCK_PUT(lock);
-                rc = 0;
-        } else {
+       /*
+        *step 3: find the child object by fid & lock it.
+        *        regardless if it is local or remote.
+        *
+        *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
+        *      set parent dir fid the same as child fid in getattr by fid case
+        *      we should not lu_object_find() the object again, could lead
+        *      to hung if there is a concurrent unlink destroyed the object.
+        */
+       if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
+               mdt_object_get(info->mti_env, parent);
+               child = parent;
+       } else {
+               child = mdt_object_find(info->mti_env, info->mti_mdt,
+                                       child_fid);
+       }
+
+       if (unlikely(IS_ERR(child)))
+               GOTO(out_parent, rc = PTR_ERR(child));
+       if (is_resent) {
+               /* Do not take lock for resent case. */
+               lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
+               LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
+                        lhc->mlh_reg_lh.cookie);
+
+               res_id = &lock->l_resource->lr_name;
+               if (!fid_res_name_eq(mdt_object_fid(child),
+                                    &lock->l_resource->lr_name)) {
+                       LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
+                                                &lock->l_resource->lr_name),
+                                "Lock res_id: "DLDLMRES", fid: "DFID"\n",
+                                PLDLMRES(lock->l_resource),
+                                PFID(mdt_object_fid(parent)));
+                       CWARN("Although resent, but still not get child lock"
+                             "parent:"DFID" child:"DFID"\n",
+                             PFID(mdt_object_fid(parent)),
+                             PFID(mdt_object_fid(child)));
+                       lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
+                       LDLM_LOCK_PUT(lock);
+                       GOTO(relock, 0);
+               }
+               LDLM_LOCK_PUT(lock);
+               rc = 0;
+       } else {
                bool try_layout = false;
 
 relock:
@@ -1355,7 +1421,7 @@ relock:
 
                if (!mdt_object_exists(child)) {
                        LU_OBJECT_DEBUG(D_INODE, info->mti_env,
-                                       &child->mot_obj.mo_lu,
+                                       &child->mot_obj,
                                        "Object doesn't exist!\n");
                        GOTO(out_child, rc = -ENOENT);
                }
@@ -1370,11 +1436,11 @@ relock:
                         if (unlikely(rc != 0))
                                 GOTO(out_child, rc);
 
-                        /* If the file has not been changed for some time, we
-                         * return not only a LOOKUP lock, but also an UPDATE
-                         * lock and this might save us RPC on later STAT. For
-                         * directories, it also let negative dentry starts
-                         * working for this dir. */
+                       /* If the file has not been changed for some time, we
+                        * return not only a LOOKUP lock, but also an UPDATE
+                        * lock and this might save us RPC on later STAT. For
+                        * directories, it also let negative dentry cache start
+                        * working for this dir. */
                         if (ma->ma_valid & MA_INODE &&
                             ma->ma_attr.la_valid & LA_CTIME &&
                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
@@ -1387,8 +1453,8 @@ relock:
                LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
                if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
                    exp_connect_layout(info->mti_exp) &&
-                   S_ISREG(lu_object_attr(&child->mot_obj.mo_lu)) &&
-                   ldlm_rep != NULL) {
+                   S_ISREG(lu_object_attr(&child->mot_obj)) &&
+                   !mdt_object_remote(child) && ldlm_rep != NULL) {
                        /* try to grant layout lock for regular file. */
                        try_layout = true;
                }
@@ -1427,17 +1493,15 @@ relock:
         rc = mdt_getattr_internal(info, child, ma_need);
         if (unlikely(rc != 0)) {
                 mdt_object_unlock(info, child, lhc, 1);
-        } else if (lock) {
-                /* Debugging code. */
-                res_id = &lock->l_resource->lr_name;
-                LDLM_DEBUG(lock, "Returning lock to client");
-                LASSERTF(fid_res_name_eq(mdt_object_fid(child),
-                                         &lock->l_resource->lr_name),
-                         "Lock res_id: %lu/%lu/%lu, Fid: "DFID".\n",
-                         (unsigned long)res_id->name[0],
-                         (unsigned long)res_id->name[1],
-                         (unsigned long)res_id->name[2],
-                         PFID(mdt_object_fid(child)));
+       } else if (lock) {
+               /* Debugging code. */
+               res_id = &lock->l_resource->lr_name;
+               LDLM_DEBUG(lock, "Returning lock to client");
+               LASSERTF(fid_res_name_eq(mdt_object_fid(child),
+                                        &lock->l_resource->lr_name),
+                        "Lock res_id: "DLDLMRES", fid: "DFID"\n",
+                        PLDLMRES(lock->l_resource),
+                        PFID(mdt_object_fid(child)));
                if (mdt_object_exists(child) && !mdt_object_remote(child))
                        mdt_pack_size2body(info, child);
         }
@@ -1454,8 +1518,9 @@ out_parent:
 }
 
 /* normal handler: should release the child lock */
-int mdt_getattr_name(struct mdt_thread_info *info)
+int mdt_getattr_name(struct tgt_session_info *tsi)
 {
+       struct mdt_thread_info  *info = tsi2mdt_info(tsi);
         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
         struct mdt_body        *reqbody;
         struct mdt_body        *repbody;
@@ -1487,47 +1552,42 @@ out_shrink:
         rc2 = mdt_fix_reply(info);
         if (rc == 0)
                 rc = rc2;
-        return rc;
+       mdt_thread_info_fini(info);
+       return rc;
 }
 
 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
                          void *karg, void *uarg);
 
-int mdt_set_info(struct mdt_thread_info *info)
+int mdt_set_info(struct tgt_session_info *tsi)
 {
-        struct ptlrpc_request *req = mdt_info_req(info);
-        char *key;
-        void *val;
-        int keylen, vallen, rc = 0;
-        ENTRY;
-
-        rc = req_capsule_server_pack(info->mti_pill);
-        if (rc)
-                RETURN(rc);
+       struct ptlrpc_request   *req = tgt_ses_req(tsi);
+       char                    *key;
+       void                    *val;
+       int                      keylen, vallen, rc = 0;
 
-        key = req_capsule_client_get(info->mti_pill, &RMF_SETINFO_KEY);
-        if (key == NULL) {
-                DEBUG_REQ(D_HA, req, "no set_info key");
-                RETURN(-EFAULT);
-        }
+       ENTRY;
 
-        keylen = req_capsule_get_size(info->mti_pill, &RMF_SETINFO_KEY,
-                                      RCL_CLIENT);
+       key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
+       if (key == NULL) {
+               DEBUG_REQ(D_HA, req, "no set_info key");
+               RETURN(err_serious(-EFAULT));
+       }
 
-        val = req_capsule_client_get(info->mti_pill, &RMF_SETINFO_VAL);
-        if (val == NULL) {
-                DEBUG_REQ(D_HA, req, "no set_info val");
-                RETURN(-EFAULT);
-        }
+       keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
+                                     RCL_CLIENT);
 
-        vallen = req_capsule_get_size(info->mti_pill, &RMF_SETINFO_VAL,
-                                      RCL_CLIENT);
+       val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
+       if (val == NULL) {
+               DEBUG_REQ(D_HA, req, "no set_info val");
+               RETURN(err_serious(-EFAULT));
+       }
 
-        /* Swab any part of val you need to here */
-        if (KEY_IS(KEY_READ_ONLY)) {
-                req->rq_status = 0;
-                lustre_msg_set_status(req->rq_repmsg, 0);
+       vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
+                                     RCL_CLIENT);
 
+       /* Swab any part of val you need to here */
+       if (KEY_IS(KEY_READ_ONLY)) {
                spin_lock(&req->rq_export->exp_lock);
                if (*(__u32 *)val)
                        *exp_connect_flags_ptr(req->rq_export) |=
@@ -1536,130 +1596,44 @@ int mdt_set_info(struct mdt_thread_info *info)
                        *exp_connect_flags_ptr(req->rq_export) &=
                                ~OBD_CONNECT_RDONLY;
                spin_unlock(&req->rq_export->exp_lock);
+       } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
+               struct changelog_setinfo *cs = val;
 
-        } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
-                struct changelog_setinfo *cs =
-                        (struct changelog_setinfo *)val;
-                if (vallen != sizeof(*cs)) {
-                        CERROR("Bad changelog_clear setinfo size %d\n", vallen);
-                        RETURN(-EINVAL);
-                }
-                if (ptlrpc_req_need_swab(req)) {
-                        __swab64s(&cs->cs_recno);
-                        __swab32s(&cs->cs_id);
-                }
-
-                rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, info->mti_exp,
-                                   vallen, val, NULL);
-                lustre_msg_set_status(req->rq_repmsg, rc);
-
-        } else {
-                RETURN(-EINVAL);
-        }
-        RETURN(0);
-}
-
-/**
- * Top-level handler for MDT connection requests.
- */
-int mdt_connect(struct mdt_thread_info *info)
-{
-       int rc;
-       struct obd_connect_data *reply;
-       struct obd_export *exp;
-       struct ptlrpc_request *req = mdt_info_req(info);
-
-       rc = target_handle_connect(req);
-       if (rc != 0)
-               return err_serious(rc);
+               if (vallen != sizeof(*cs)) {
+                       CERROR("%s: bad changelog_clear setinfo size %d\n",
+                              tgt_name(tsi->tsi_tgt), vallen);
+                       RETURN(-EINVAL);
+               }
+               if (ptlrpc_req_need_swab(req)) {
+                       __swab64s(&cs->cs_recno);
+                       __swab32s(&cs->cs_id);
+               }
 
-       LASSERT(req->rq_export != NULL);
-       info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
-       rc = mdt_init_sec_level(info);
-       if (rc != 0) {
-               obd_disconnect(class_export_get(req->rq_export));
-               return rc;
+               rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
+                                  vallen, val, NULL);
+       } else {
+               RETURN(-EINVAL);
        }
-
-       /* To avoid exposing partially initialized connection flags, changes up
-        * to this point have been staged in reply->ocd_connect_flags. Now that
-        * connection handling has completed successfully, atomically update
-        * the connect flags in the shared export data structure. LU-1623 */
-       reply = req_capsule_server_get(info->mti_pill, &RMF_CONNECT_DATA);
-       exp = req->rq_export;
-       spin_lock(&exp->exp_lock);
-       *exp_connect_flags_ptr(exp) = reply->ocd_connect_flags;
-       spin_unlock(&exp->exp_lock);
-
-       rc = mdt_init_idmap(info);
-       if (rc != 0)
-               obd_disconnect(class_export_get(req->rq_export));
-
-       return rc;
-}
-
-int mdt_disconnect(struct mdt_thread_info *info)
-{
-        int rc;
-        ENTRY;
-
-        rc = target_handle_disconnect(mdt_info_req(info));
-        if (rc)
-                rc = err_serious(rc);
-        RETURN(rc);
+       RETURN(rc);
 }
 
-static int mdt_sendpage(struct mdt_thread_info *info,
-                        struct lu_rdpg *rdpg, int nob)
+int mdt_readpage(struct tgt_session_info *tsi)
 {
-        struct ptlrpc_request   *req = mdt_info_req(info);
-        struct obd_export       *exp = req->rq_export;
-        struct ptlrpc_bulk_desc *desc;
-        struct l_wait_info      *lwi = &info->mti_u.rdpg.mti_wait_info;
-        int                      tmpcount;
-        int                      tmpsize;
-        int                      i;
-        int                      rc;
-        ENTRY;
-
-       desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1, BULK_PUT_SOURCE,
-                                   MDS_BULK_PORTAL);
-       if (desc == NULL)
-               RETURN(-ENOMEM);
-
-       if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
-               /* old client requires reply size in it's PAGE_SIZE,
-                * which is rdpg->rp_count */
-               nob = rdpg->rp_count;
-
-       for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
-            i++, tmpcount -= tmpsize) {
-                tmpsize = min_t(int, tmpcount, CFS_PAGE_SIZE);
-               ptlrpc_prep_bulk_page_pin(desc, rdpg->rp_pages[i], 0, tmpsize);
-        }
-
-        LASSERT(desc->bd_nob == nob);
-        rc = target_bulk_io(exp, desc, lwi);
-       ptlrpc_free_bulk_pin(desc);
-        RETURN(rc);
-}
+       struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
+       struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
+       struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
+       const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
+       struct mdt_body         *repbody;
+       int                      rc;
+       int                      i;
 
-int mdt_readpage(struct mdt_thread_info *info)
-{
-        struct mdt_object *object = info->mti_object;
-        struct lu_rdpg    *rdpg = &info->mti_u.rdpg.mti_rdpg;
-        struct mdt_body   *reqbody;
-        struct mdt_body   *repbody;
-        int                rc;
-        int                i;
-        ENTRY;
+       ENTRY;
 
-        if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
-                RETURN(err_serious(-ENOMEM));
+       if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
+               RETURN(err_serious(-ENOMEM));
 
-        reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
-        repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
-        if (reqbody == NULL || repbody == NULL)
+       repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
+       if (repbody == NULL || reqbody == NULL)
                 RETURN(err_serious(-EFAULT));
 
         /*
@@ -1675,53 +1649,53 @@ int mdt_readpage(struct mdt_thread_info *info)
         }
 
         rdpg->rp_attrs = reqbody->mode;
-       if (exp_connect_flags(info->mti_exp) & OBD_CONNECT_64BITHASH)
+       if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
                rdpg->rp_attrs |= LUDA_64BITHASH;
        rdpg->rp_count  = min_t(unsigned int, reqbody->nlink,
-                               exp_max_brw_size(info->mti_exp));
-        rdpg->rp_npages = (rdpg->rp_count + CFS_PAGE_SIZE - 1) >>
-                          CFS_PAGE_SHIFT;
+                               exp_max_brw_size(tsi->tsi_exp));
+       rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
+                         PAGE_CACHE_SHIFT;
         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
         if (rdpg->rp_pages == NULL)
                 RETURN(-ENOMEM);
 
         for (i = 0; i < rdpg->rp_npages; ++i) {
-                rdpg->rp_pages[i] = cfs_alloc_page(CFS_ALLOC_STD);
+               rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
                 if (rdpg->rp_pages[i] == NULL)
                         GOTO(free_rdpg, rc = -ENOMEM);
         }
 
         /* call lower layers to fill allocated pages with directory data */
-        rc = mo_readpage(info->mti_env, mdt_object_child(object), rdpg);
-        if (rc < 0)
-                GOTO(free_rdpg, rc);
+       rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
+       if (rc < 0)
+               GOTO(free_rdpg, rc);
 
-        /* send pages to client */
-        rc = mdt_sendpage(info, rdpg, rc);
+       /* send pages to client */
+       rc = tgt_sendpage(tsi, rdpg, rc);
 
-        EXIT;
+       EXIT;
 free_rdpg:
 
-        for (i = 0; i < rdpg->rp_npages; i++)
-                if (rdpg->rp_pages[i] != NULL)
-                        cfs_free_page(rdpg->rp_pages[i]);
-        OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
+       for (i = 0; i < rdpg->rp_npages; i++)
+               if (rdpg->rp_pages[i] != NULL)
+                       __free_page(rdpg->rp_pages[i]);
+       OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
 
-        if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
-                RETURN(0);
+       if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
+               RETURN(0);
 
-        return rc;
+       return rc;
 }
 
 static int mdt_reint_internal(struct mdt_thread_info *info,
                               struct mdt_lock_handle *lhc,
                               __u32 op)
 {
-        struct req_capsule      *pill = info->mti_pill;
-        struct mdt_body         *repbody;
-        int                      rc = 0, rc2;
-        ENTRY;
+       struct req_capsule      *pill = info->mti_pill;
+       struct mdt_body         *repbody;
+       int                      rc = 0, rc2;
 
+       ENTRY;
 
         rc = mdt_reint_unpack(info, op);
         if (rc != 0) {
@@ -1782,23 +1756,24 @@ out_shrink:
         return rc;
 }
 
-static long mdt_reint_opcode(struct mdt_thread_info *info,
+static long mdt_reint_opcode(struct ptlrpc_request *req,
                             const struct req_format **fmt)
 {
-       struct mdt_rec_reint *rec;
-       long opc;
+       struct mdt_device       *mdt;
+       struct mdt_rec_reint    *rec;
+       long                     opc;
 
-       rec = req_capsule_client_get(info->mti_pill, &RMF_REC_REINT);
+       rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
        if (rec != NULL) {
                opc = rec->rr_opcode;
-               DEBUG_REQ(D_INODE, mdt_info_req(info), "reint opt = %ld", opc);
+               DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
                if (opc < REINT_MAX && fmt[opc] != NULL)
-                       req_capsule_extend(info->mti_pill, fmt[opc]);
+                       req_capsule_extend(&req->rq_pill, fmt[opc]);
                else {
-                       CERROR("%s: Unsupported opcode '%ld' from client '%s': "
-                              "rc = %d\n", mdt_obd_name(info->mti_mdt), opc,
-                              info->mti_mdt->mdt_ldlm_client->cli_name,
-                              -EFAULT);
+                       mdt = mdt_exp2dev(req->rq_export);
+                       CERROR("%s: Unsupported opcode '%ld' from client '%s':"
+                              " rc = %d\n", req->rq_export->exp_obd->obd_name,
+                              opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
                        opc = err_serious(-EFAULT);
                }
        } else {
@@ -1807,11 +1782,10 @@ static long mdt_reint_opcode(struct mdt_thread_info *info,
        return opc;
 }
 
-int mdt_reint(struct mdt_thread_info *info)
+int mdt_reint(struct tgt_session_info *tsi)
 {
        long opc;
        int  rc;
-
        static const struct req_format *reint_fmts[REINT_MAX] = {
                [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
                [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
@@ -1820,24 +1794,26 @@ int mdt_reint(struct mdt_thread_info *info)
                [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
                [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
                [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
-               [REINT_RMENTRY] = &RQF_MDS_REINT_UNLINK
+               [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK
        };
 
-        ENTRY;
+       ENTRY;
 
-        opc = mdt_reint_opcode(info, reint_fmts);
-        if (opc >= 0) {
-                /*
-                 * No lock possible here from client to pass it to reint code
-                 * path.
-                 */
-                rc = mdt_reint_internal(info, NULL, opc);
-        } else {
-                rc = opc;
-        }
+       opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
+       if (opc >= 0) {
+               struct mdt_thread_info *info = tsi2mdt_info(tsi);
+               /*
+                * No lock possible here from client to pass it to reint code
+                * path.
+                */
+               rc = mdt_reint_internal(info, NULL, opc);
+               mdt_thread_info_fini(info);
+       } else {
+               rc = opc;
+       }
 
-        info->mti_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
-        RETURN(rc);
+       tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
+       RETURN(rc);
 }
 
 /* this should sync the whole device */
@@ -1869,93 +1845,60 @@ static int mdt_object_sync(struct mdt_thread_info *info)
         RETURN(rc);
 }
 
-int mdt_sync(struct mdt_thread_info *info)
-{
-        struct ptlrpc_request *req = mdt_info_req(info);
-        struct req_capsule *pill = info->mti_pill;
-        struct mdt_body *body;
-        int rc;
-        ENTRY;
-
-        /* The fid may be zero, so we req_capsule_set manually */
-        req_capsule_set(pill, &RQF_MDS_SYNC);
-
-        body = req_capsule_client_get(pill, &RMF_MDT_BODY);
-        if (body == NULL)
-                RETURN(err_serious(-EINVAL));
-
-        if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
-                RETURN(err_serious(-ENOMEM));
-
-        if (fid_seq(&body->fid1) == 0) {
-                /* sync the whole device */
-                rc = req_capsule_server_pack(pill);
-                if (rc == 0)
-                        rc = mdt_device_sync(info->mti_env, info->mti_mdt);
-                else
-                        rc = err_serious(rc);
-        } else {
-                /* sync an object */
-                rc = mdt_unpack_req_pack_rep(info, HABEO_CORPUS|HABEO_REFERO);
-                if (rc == 0) {
-                        rc = mdt_object_sync(info);
-                        if (rc == 0) {
-                                const struct lu_fid *fid;
-                                struct lu_attr *la = &info->mti_attr.ma_attr;
-
-                                info->mti_attr.ma_need = MA_INODE;
-                                info->mti_attr.ma_valid = 0;
-                               rc = mdt_attr_get_complex(info, info->mti_object,
-                                                         &info->mti_attr);
-                                if (rc == 0) {
-                                        body = req_capsule_server_get(pill,
-                                                                &RMF_MDT_BODY);
-                                        fid = mdt_object_fid(info->mti_object);
-                                        mdt_pack_attr2body(info, body, la, fid);
-                                }
-                        }
-                } else
-                        rc = err_serious(rc);
-        }
-        if (rc == 0)
-               mdt_counter_incr(req, LPROC_MDT_SYNC);
-
-        RETURN(rc);
-}
-
-/*
- * Quotacheck handler.
- * in-kernel quotacheck isn't supported any more.
- */
-int mdt_quotacheck(struct mdt_thread_info *info)
+int mdt_sync(struct tgt_session_info *tsi)
 {
-       struct obd_quotactl     *oqctl;
+       struct ptlrpc_request   *req = tgt_ses_req(tsi);
+       struct req_capsule      *pill = tsi->tsi_pill;
+       struct mdt_body         *body;
        int                      rc;
+
        ENTRY;
 
-       oqctl = req_capsule_client_get(info->mti_pill, &RMF_OBD_QUOTACTL);
-       if (oqctl == NULL)
-               RETURN(err_serious(-EPROTO));
+       if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
+               RETURN(err_serious(-ENOMEM));
 
-       rc = req_capsule_server_pack(info->mti_pill);
-       if (rc)
-               RETURN(err_serious(rc));
+       if (fid_seq(&tsi->tsi_mdt_body->fid1) == 0) {
+               rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
+       } else {
+               struct mdt_thread_info *info = tsi2mdt_info(tsi);
+
+               /* sync an object */
+               rc = mdt_object_sync(info);
+               if (rc == 0) {
+                       const struct lu_fid *fid;
+                       struct lu_attr *la = &info->mti_attr.ma_attr;
+
+                       info->mti_attr.ma_need = MA_INODE;
+                       info->mti_attr.ma_valid = 0;
+                       rc = mdt_attr_get_complex(info, info->mti_object,
+                                                 &info->mti_attr);
+                       if (rc == 0) {
+                               body = req_capsule_server_get(pill,
+                                                             &RMF_MDT_BODY);
+                               fid = mdt_object_fid(info->mti_object);
+                               mdt_pack_attr2body(info, body, la, fid);
+                       }
+               }
+               mdt_thread_info_fini(info);
+       }
+       if (rc == 0)
+               mdt_counter_incr(req, LPROC_MDT_SYNC);
 
-       /* deprecated, not used any more */
-       RETURN(-EOPNOTSUPP);
+       RETURN(rc);
 }
 
 /*
  * Handle quota control requests to consult current usage/limit, but also
  * to configure quota enforcement
  */
-int mdt_quotactl(struct mdt_thread_info *info)
+int mdt_quotactl(struct tgt_session_info *tsi)
 {
-       struct obd_export       *exp  = info->mti_exp;
-       struct req_capsule      *pill = info->mti_pill;
+       struct obd_export       *exp  = tsi->tsi_exp;
+       struct req_capsule      *pill = tsi->tsi_pill;
        struct obd_quotactl     *oqctl, *repoqc;
        int                      id, rc;
-       struct lu_device        *qmt = info->mti_mdt->mdt_qmt_dev;
+       struct mdt_device       *mdt = mdt_exp2dev(exp);
+       struct lu_device        *qmt = mdt->mdt_qmt_dev;
        ENTRY;
 
        oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
@@ -1996,7 +1939,7 @@ int mdt_quotactl(struct mdt_thread_info *info)
        if (exp_connect_rmtclient(exp)) {
                struct lustre_idmap_table *idmap;
 
-               idmap = mdt_req2med(mdt_info_req(info))->med_idmap;
+               idmap = exp->exp_mdt_data.med_idmap;
 
                if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
                             oqctl->qc_cmd != Q_GETINFO))
@@ -2031,13 +1974,13 @@ int mdt_quotactl(struct mdt_thread_info *info)
        case Q_SETQUOTA:
        case Q_GETQUOTA:
                /* forward quotactl request to QMT */
-               rc = qmt_hdls.qmth_quotactl(info->mti_env, qmt, oqctl);
+               rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
                break;
 
        case Q_GETOINFO:
        case Q_GETOQUOTA:
                /* slave quotactl */
-               rc = lquotactl_slv(info->mti_env, info->mti_mdt->mdt_bottom,
+               rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
                                   oqctl);
                break;
 
@@ -2053,136 +1996,23 @@ int mdt_quotactl(struct mdt_thread_info *info)
        RETURN(rc);
 }
 
-/*
- * OBD PING and other handlers.
+/** clone llog ctxt from child (mdd)
+ * This allows remote llog (replicator) access.
+ * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
+ * context was originally set up, or we can handle them directly.
+ * I choose the latter, but that means I need any llog
+ * contexts set up by child to be accessable by the mdt.  So we clone the
+ * context into our context list here.
  */
-int mdt_obd_ping(struct mdt_thread_info *info)
+static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
+                               int idx)
 {
+        struct md_device  *next = mdt->mdt_child;
+        struct llog_ctxt *ctxt;
         int rc;
-        ENTRY;
-
-        req_capsule_set(info->mti_pill, &RQF_OBD_PING);
 
-        rc = target_handle_ping(mdt_info_req(info));
-        if (rc < 0)
-                rc = err_serious(rc);
-        RETURN(rc);
-}
-
-/*
- * OBD_IDX_READ handler
- */
-int mdt_obd_idx_read(struct mdt_thread_info *info)
-{
-       struct mdt_device       *mdt = info->mti_mdt;
-       struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
-       struct idx_info         *req_ii, *rep_ii;
-       int                      rc, i;
-       ENTRY;
-
-       memset(rdpg, 0, sizeof(*rdpg));
-       req_capsule_set(info->mti_pill, &RQF_OBD_IDX_READ);
-
-       /* extract idx_info buffer from request & reply */
-       req_ii = req_capsule_client_get(info->mti_pill, &RMF_IDX_INFO);
-       if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
-               RETURN(err_serious(-EPROTO));
-
-       rc = req_capsule_server_pack(info->mti_pill);
-       if (rc)
-               RETURN(err_serious(rc));
-
-       rep_ii = req_capsule_server_get(info->mti_pill, &RMF_IDX_INFO);
-       if (rep_ii == NULL)
-               RETURN(err_serious(-EFAULT));
-       rep_ii->ii_magic = IDX_INFO_MAGIC;
-
-       /* extract hash to start with */
-       rdpg->rp_hash = req_ii->ii_hash_start;
-
-       /* extract requested attributes */
-       rdpg->rp_attrs = req_ii->ii_attrs;
-
-       /* check that fid packed in request is valid and supported */
-       if (!fid_is_sane(&req_ii->ii_fid))
-               RETURN(-EINVAL);
-       rep_ii->ii_fid = req_ii->ii_fid;
-
-       /* copy flags */
-       rep_ii->ii_flags = req_ii->ii_flags;
-
-       /* compute number of pages to allocate, ii_count is the number of 4KB
-        * containers */
-       if (req_ii->ii_count <= 0)
-               GOTO(out, rc = -EFAULT);
-       rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
-                              exp_max_brw_size(info->mti_exp));
-       rdpg->rp_npages = (rdpg->rp_count + CFS_PAGE_SIZE -1) >> CFS_PAGE_SHIFT;
-
-       /* allocate pages to store the containers */
-       OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
-       if (rdpg->rp_pages == NULL)
-               GOTO(out, rc = -ENOMEM);
-       for (i = 0; i < rdpg->rp_npages; i++) {
-               rdpg->rp_pages[i] = cfs_alloc_page(CFS_ALLOC_STD);
-               if (rdpg->rp_pages[i] == NULL)
-                       GOTO(out, rc = -ENOMEM);
-       }
-
-       /* populate pages with key/record pairs */
-       rc = dt_index_read(info->mti_env, mdt->mdt_bottom, rep_ii, rdpg);
-       if (rc < 0)
-               GOTO(out, rc);
-
-       LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
-                "asked %d > %d\n", rc, rdpg->rp_count);
-
-       /* send pages to client */
-       rc = mdt_sendpage(info, rdpg, rc);
-
-       GOTO(out, rc);
-out:
-       if (rdpg->rp_pages) {
-               for (i = 0; i < rdpg->rp_npages; i++)
-                       if (rdpg->rp_pages[i])
-                               cfs_free_page(rdpg->rp_pages[i]);
-               OBD_FREE(rdpg->rp_pages,
-                        rdpg->rp_npages * sizeof(rdpg->rp_pages[0]));
-       }
-       return rc;
-}
-
-int mdt_obd_log_cancel(struct mdt_thread_info *info)
-{
-        return err_serious(-EOPNOTSUPP);
-}
-
-int mdt_obd_qc_callback(struct mdt_thread_info *info)
-{
-        return err_serious(-EOPNOTSUPP);
-}
-
-/*
- * LLOG handlers.
- */
-
-/** clone llog ctxt from child (mdd)
- * This allows remote llog (replicator) access.
- * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
- * context was originally set up, or we can handle them directly.
- * I choose the latter, but that means I need any llog
- * contexts set up by child to be accessable by the mdt.  So we clone the
- * context into our context list here.
- */
-static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
-                               int idx)
-{
-        struct md_device  *next = mdt->mdt_child;
-        struct llog_ctxt *ctxt;
-        int rc;
-
-        if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
-                return 0;
+        if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
+                return 0;
 
         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
         if (rc || ctxt == NULL) {
@@ -2210,150 +2040,45 @@ static int mdt_llog_ctxt_unclone(const struct lu_env *env,
         return 0;
 }
 
-int mdt_llog_create(struct mdt_thread_info *info)
-{
-       int rc;
-
-       req_capsule_set(info->mti_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
-       rc = llog_origin_handle_open(mdt_info_req(info));
-       return (rc < 0 ? err_serious(rc) : rc);
-}
-
-int mdt_llog_destroy(struct mdt_thread_info *info)
-{
-        int rc;
-
-        req_capsule_set(info->mti_pill, &RQF_LLOG_ORIGIN_HANDLE_DESTROY);
-        rc = llog_origin_handle_destroy(mdt_info_req(info));
-        return (rc < 0 ? err_serious(rc) : rc);
-}
-
-int mdt_llog_read_header(struct mdt_thread_info *info)
-{
-        int rc;
-
-        req_capsule_set(info->mti_pill, &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
-        rc = llog_origin_handle_read_header(mdt_info_req(info));
-        return (rc < 0 ? err_serious(rc) : rc);
-}
-
-int mdt_llog_next_block(struct mdt_thread_info *info)
-{
-        int rc;
-
-        req_capsule_set(info->mti_pill, &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
-        rc = llog_origin_handle_next_block(mdt_info_req(info));
-        return (rc < 0 ? err_serious(rc) : rc);
-}
-
-int mdt_llog_prev_block(struct mdt_thread_info *info)
-{
-        int rc;
-
-        req_capsule_set(info->mti_pill, &RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK);
-        rc = llog_origin_handle_prev_block(mdt_info_req(info));
-        return (rc < 0 ? err_serious(rc) : rc);
-}
-
-
-/*
- * DLM handlers.
- */
-
-static struct ldlm_callback_suite cbs = {
-       .lcs_completion = ldlm_server_completion_ast,
-       .lcs_blocking   = ldlm_server_blocking_ast,
-       .lcs_glimpse    = ldlm_server_glimpse_ast
-};
-
-int mdt_enqueue(struct mdt_thread_info *info)
-{
-        struct ptlrpc_request *req;
-        int rc;
-
-        /*
-         * info->mti_dlm_req already contains swapped and (if necessary)
-         * converted dlm request.
-         */
-        LASSERT(info->mti_dlm_req != NULL);
-
-        req = mdt_info_req(info);
-        rc = ldlm_handle_enqueue0(info->mti_mdt->mdt_namespace,
-                                  req, info->mti_dlm_req, &cbs);
-        info->mti_fail_id = OBD_FAIL_LDLM_REPLY;
-        return rc ? err_serious(rc) : req->rq_status;
-}
-
-int mdt_convert(struct mdt_thread_info *info)
-{
-        int rc;
-        struct ptlrpc_request *req;
-
-        LASSERT(info->mti_dlm_req);
-        req = mdt_info_req(info);
-        rc = ldlm_handle_convert0(req, info->mti_dlm_req);
-        return rc ? err_serious(rc) : req->rq_status;
-}
-
-int mdt_bl_callback(struct mdt_thread_info *info)
-{
-        CERROR("bl callbacks should not happen on MDS\n");
-        LBUG();
-        return err_serious(-EOPNOTSUPP);
-}
-
-int mdt_cp_callback(struct mdt_thread_info *info)
-{
-        CERROR("cp callbacks should not happen on MDS\n");
-        LBUG();
-        return err_serious(-EOPNOTSUPP);
-}
-
 /*
  * sec context handlers
  */
-int mdt_sec_ctx_handle(struct mdt_thread_info *info)
+int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
 {
-        int rc;
-
-        rc = mdt_handle_idmap(info);
+       int rc;
 
-        if (unlikely(rc)) {
-                struct ptlrpc_request *req = mdt_info_req(info);
-                __u32                  opc;
+       rc = mdt_handle_idmap(tsi);
+       if (unlikely(rc)) {
+               struct ptlrpc_request   *req = tgt_ses_req(tsi);
+               __u32                    opc;
 
-                opc = lustre_msg_get_opc(req->rq_reqmsg);
-                if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
-                        sptlrpc_svc_ctx_invalidate(req);
-        }
+               opc = lustre_msg_get_opc(req->rq_reqmsg);
+               if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
+                       sptlrpc_svc_ctx_invalidate(req);
+       }
 
-        CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
+       CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
 
-        return rc;
+       return rc;
 }
 
 /*
  * quota request handlers
  */
-int mdt_quota_dqacq(struct mdt_thread_info *info)
+int mdt_quota_dqacq(struct tgt_session_info *tsi)
 {
-       struct lu_device        *qmt = info->mti_mdt->mdt_qmt_dev;
+       struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
+       struct lu_device        *qmt = mdt->mdt_qmt_dev;
        int                      rc;
        ENTRY;
 
        if (qmt == NULL)
                RETURN(err_serious(-EOPNOTSUPP));
 
-       rc = qmt_hdls.qmth_dqacq(info->mti_env, qmt, mdt_info_req(info));
+       rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
        RETURN(rc);
 }
 
-static struct mdt_object *mdt_obj(struct lu_object *o)
-{
-        LASSERT(lu_device_is_mdt(o->lo_dev));
-        return container_of0(o, struct mdt_object, mot_obj.mo_lu);
-}
-
 struct mdt_object *mdt_object_new(const struct lu_env *env,
                                  struct mdt_device *d,
                                  const struct lu_fid *f)
@@ -2364,7 +2089,7 @@ struct mdt_object *mdt_object_new(const struct lu_env *env,
        ENTRY;
 
        CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
-       o = lu_object_find(env, &d->mdt_md_dev.md_lu_dev, f, &conf);
+       o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
        if (unlikely(IS_ERR(o)))
                m = (struct mdt_object *)o;
        else
@@ -2373,20 +2098,21 @@ struct mdt_object *mdt_object_new(const struct lu_env *env,
 }
 
 struct mdt_object *mdt_object_find(const struct lu_env *env,
-                                   struct mdt_device *d,
-                                   const struct lu_fid *f)
+                                  struct mdt_device *d,
+                                  const struct lu_fid *f)
 {
-        struct lu_object *o;
-        struct mdt_object *m;
-        ENTRY;
+       struct lu_object *o;
+       struct mdt_object *m;
+       ENTRY;
 
-        CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
-        o = lu_object_find(env, &d->mdt_md_dev.md_lu_dev, f, NULL);
-        if (unlikely(IS_ERR(o)))
-                m = (struct mdt_object *)o;
-        else
-                m = mdt_obj(o);
-        RETURN(m);
+       CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
+       o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
+       if (unlikely(IS_ERR(o)))
+               m = (struct mdt_object *)o;
+       else
+               m = mdt_obj(o);
+
+       RETURN(m);
 }
 
 /**
@@ -2526,7 +2252,7 @@ int mdt_remote_object_lock(struct mdt_thread_info *mti,
 
        LASSERT(mdt_object_remote(o));
 
-       LASSERT((ibits & MDS_INODELOCK_UPDATE));
+       LASSERT(ibits & MDS_INODELOCK_UPDATE);
 
        memset(einfo, 0, sizeof(*einfo));
        einfo->ei_type = LDLM_IBITS;
@@ -2560,11 +2286,13 @@ static int mdt_object_lock0(struct mdt_thread_info *info, struct mdt_object *o,
 
        if (mdt_object_remote(o)) {
                 if (locality == MDT_CROSS_LOCK) {
-                       ibits &= ~(MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM);
+                       ibits &= ~(MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM |
+                                  MDS_INODELOCK_LAYOUT);
                         ibits |= MDS_INODELOCK_LOOKUP;
                 } else {
                        LASSERTF(!(ibits &
-                                 (MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM)),
+                                (MDS_INODELOCK_UPDATE | MDS_INODELOCK_PERM |
+                                 MDS_INODELOCK_LAYOUT)),
                                "%s: wrong bit "LPX64" for remote obj "DFID"\n",
                                mdt_obd_name(info->mti_mdt), ibits,
                                PFID(mdt_object_fid(o)));
@@ -2581,8 +2309,8 @@ static int mdt_object_lock0(struct mdt_thread_info *info, struct mdt_object *o,
                         RETURN(-ESTALE);
                 } else {
                         /* Non-dir object shouldn't have PDO lock */
-                        if (!S_ISDIR(lu_object_attr(&o->mot_obj.mo_lu)))
-                                RETURN(-ENOTDIR);
+                       if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
+                               RETURN(-ENOTDIR);
                 }
         }
 
@@ -2692,15 +2420,21 @@ void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
 
                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
                                  h->cookie);
-                        CDEBUG(D_HA, "request = %p reply state = %p"
-                               " transno = "LPD64"\n",
-                               req, req->rq_reply_state, req->rq_transno);
-                        if (mdt_cos_is_enabled(mdt)) {
-                                no_ack = 1;
-                                ldlm_lock_downgrade(lock, LCK_COS);
-                                mode = LCK_COS;
-                        }
-                        ptlrpc_save_lock(req, h, mode, no_ack);
+                       /* there is no request if mdt_object_unlock() is called
+                        * from mdt_export_cleanup()->mdt_add_dirty_flag() */
+                       if (likely(req != NULL)) {
+                               CDEBUG(D_HA, "request = %p reply state = %p"
+                                      " transno = "LPD64"\n", req,
+                                      req->rq_reply_state, req->rq_transno);
+                               if (mdt_cos_is_enabled(mdt)) {
+                                       no_ack = 1;
+                                       ldlm_lock_downgrade(lock, LCK_COS);
+                                       mode = LCK_COS;
+                               }
+                               ptlrpc_save_lock(req, h, mode, no_ack);
+                       } else {
+                               ldlm_lock_decref(h, mode);
+                       }
                         if (mdt_is_lock_sync(lock)) {
                                 CDEBUG(D_HA, "found sync-lock,"
                                        " async commit started\n");
@@ -2771,40 +2505,6 @@ void mdt_object_unlock_put(struct mdt_thread_info * info,
         mdt_object_put(info->mti_env, o);
 }
 
-struct mdt_handler *mdt_handler_find(__u32 opc, struct mdt_opc_slice *supported)
-{
-        struct mdt_opc_slice *s;
-        struct mdt_handler   *h;
-
-        h = NULL;
-        for (s = supported; s->mos_hs != NULL; s++) {
-                if (s->mos_opc_start <= opc && opc < s->mos_opc_end) {
-                        h = s->mos_hs + (opc - s->mos_opc_start);
-                        if (likely(h->mh_opc != 0))
-                                LASSERTF(h->mh_opc == opc,
-                                         "opcode mismatch %d != %d\n",
-                                         h->mh_opc, opc);
-                        else
-                                h = NULL; /* unsupported opc */
-                        break;
-                }
-        }
-        return h;
-}
-
-static int mdt_lock_resname_compat(struct mdt_device *m,
-                                   struct ldlm_request *req)
-{
-        /* XXX something... later. */
-        return 0;
-}
-
-static int mdt_lock_reply_compat(struct mdt_device *m, struct ldlm_reply *rep)
-{
-        /* XXX something... later. */
-        return 0;
-}
-
 /*
  * Generic code handling requests that have struct mdt_body passed in:
  *
@@ -2899,150 +2599,13 @@ static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
 
 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
 {
-        struct md_device *next = m->mdt_child;
+       struct md_device *next = m->mdt_child;
 
-        return next->md_ops->mdo_init_capa_ctxt(env, next,
-                                                m->mdt_opts.mo_mds_capa,
-                                                m->mdt_capa_timeout,
-                                                m->mdt_capa_alg,
-                                                m->mdt_capa_keys);
-}
-
-/*
- * Invoke handler for this request opc. Also do necessary preprocessing
- * (according to handler ->mh_flags), and post-processing (setting of
- * ->last_{xid,committed}).
- */
-static int mdt_req_handle(struct mdt_thread_info *info,
-                          struct mdt_handler *h, struct ptlrpc_request *req)
-{
-        int   rc, serious = 0;
-        __u32 flags;
-
-        ENTRY;
-
-        LASSERT(h->mh_act != NULL);
-        LASSERT(h->mh_opc == lustre_msg_get_opc(req->rq_reqmsg));
-        LASSERT(current->journal_info == NULL);
-
-        /*
-         * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
-         * to put same checks into handlers like mdt_close(), mdt_reint(),
-         * etc., without talking to mdt authors first. Checking same thing
-         * there again is useless and returning 0 error without packing reply
-         * is buggy! Handlers either pack reply or return error.
-         *
-         * We return 0 here and do not send any reply in order to emulate
-         * network failure. Do not send any reply in case any of NET related
-         * fail_id has occured.
-         */
-        if (OBD_FAIL_CHECK_ORSET(h->mh_fail_id, OBD_FAIL_ONCE))
-                RETURN(0);
-
-        rc = 0;
-        flags = h->mh_flags;
-        LASSERT(ergo(flags & (HABEO_CORPUS|HABEO_REFERO), h->mh_fmt != NULL));
-
-        if (h->mh_fmt != NULL) {
-                req_capsule_set(info->mti_pill, h->mh_fmt);
-                rc = mdt_unpack_req_pack_rep(info, flags);
-        }
-
-       if (rc == 0 && flags & MUTABOR &&
-           exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
-               /* should it be rq_status? */
-               rc = -EROFS;
-
-        if (rc == 0 && flags & HABEO_CLAVIS) {
-                struct ldlm_request *dlm_req;
-
-                LASSERT(h->mh_fmt != NULL);
-
-                dlm_req = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
-                if (dlm_req != NULL) {
-                        if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
-                                        LDLM_IBITS &&
-                                     dlm_req->lock_desc.l_policy_data.\
-                                        l_inodebits.bits == 0)) {
-                                /*
-                                 * Lock without inodebits makes no sense and
-                                 * will oops later in ldlm. If client miss to
-                                 * set such bits, do not trigger ASSERTION.
-                                 *
-                                 * For liblustre flock case, it maybe zero.
-                                 */
-                                rc = -EPROTO;
-                        } else {
-                                if (info->mti_mdt->mdt_opts.mo_compat_resname)
-                                        rc = mdt_lock_resname_compat(
-                                                                info->mti_mdt,
-                                                                dlm_req);
-                                info->mti_dlm_req = dlm_req;
-                        }
-                } else {
-                        rc = -EFAULT;
-                }
-        }
-
-        /* capability setting changed via /proc, needs reinitialize ctxt */
-        if (info->mti_mdt && info->mti_mdt->mdt_capa_conf) {
-                mdt_init_capa_ctxt(info->mti_env, info->mti_mdt);
-                info->mti_mdt->mdt_capa_conf = 0;
-        }
-
-        if (likely(rc == 0)) {
-                /*
-                 * Process request, there can be two types of rc:
-                 * 1) errors with msg unpack/pack, other failures outside the
-                 * operation itself. This is counted as serious errors;
-                 * 2) errors during fs operation, should be placed in rq_status
-                 * only
-                 */
-                rc = h->mh_act(info);
-                if (rc == 0 &&
-                    !req->rq_no_reply && req->rq_reply_state == NULL) {
-                        DEBUG_REQ(D_ERROR, req, "MDT \"handler\" %s did not "
-                                  "pack reply and returned 0 error\n",
-                                  h->mh_name);
-                        LBUG();
-                }
-                serious = is_serious(rc);
-                rc = clear_serious(rc);
-        } else
-                serious = 1;
-
-        req->rq_status = rc;
-
-        /*
-         * ELDLM_* codes which > 0 should be in rq_status only as well as
-         * all non-serious errors.
-         */
-        if (rc > 0 || !serious)
-                rc = 0;
-
-        LASSERT(current->journal_info == NULL);
-
-        if (rc == 0 && (flags & HABEO_CLAVIS) &&
-            info->mti_mdt->mdt_opts.mo_compat_resname) {
-                struct ldlm_reply *dlmrep;
-
-                dlmrep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
-                if (dlmrep != NULL)
-                        rc = mdt_lock_reply_compat(info->mti_mdt, dlmrep);
-        }
-
-        /* If we're DISCONNECTing, the mdt_export_data is already freed */
-        if (likely(rc == 0 && req->rq_export && h->mh_opc != MDS_DISCONNECT))
-                target_committed_to_req(req);
-
-        if (unlikely(req_is_replay(req) &&
-                     lustre_msg_get_transno(req->rq_reqmsg) == 0)) {
-                DEBUG_REQ(D_ERROR, req, "transno is 0 during REPLAY");
-                LBUG();
-        }
-
-        target_send_reply(req, rc, info->mti_fail_id);
-        RETURN(0);
+       return next->md_ops->mdo_init_capa_ctxt(env, next,
+                                               m->mdt_lut.lut_mds_capa,
+                                               m->mdt_capa_timeout,
+                                               m->mdt_capa_alg,
+                                               m->mdt_capa_keys);
 }
 
 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
@@ -3067,12 +2630,11 @@ void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
  * uninitialized state, because it's too expensive to zero out whole
  * mdt_thread_info (> 1K) on each request arrival.
  */
-static void mdt_thread_info_init(struct ptlrpc_request *req,
-                                 struct mdt_thread_info *info)
+void mdt_thread_info_init(struct ptlrpc_request *req,
+                         struct mdt_thread_info *info)
 {
         int i;
 
-        req_capsule_init(&req->rq_pill, req, RCL_SERVER);
         info->mti_pill = &req->rq_pill;
 
         /* lock handle */
@@ -3085,10 +2647,8 @@ static void mdt_thread_info_init(struct ptlrpc_request *req,
                 info->mti_exp = req->rq_export;
         } else
                 info->mti_mdt = NULL;
-        info->mti_env = req->rq_svc_thread->t_env;
-        info->mti_fail_id = OBD_FAIL_MDS_ALL_REPLY_NET;
-        info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
-        info->mti_mos = NULL;
+       info->mti_env = req->rq_svc_thread->t_env;
+       info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 
         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
        info->mti_big_buf = LU_BUF_NULL;
@@ -3105,11 +2665,10 @@ static void mdt_thread_info_init(struct ptlrpc_request *req,
        info->mti_spec.sp_rm_entry = 0;
 }
 
-static void mdt_thread_info_fini(struct mdt_thread_info *info)
+void mdt_thread_info_fini(struct mdt_thread_info *info)
 {
        int i;
 
-       req_capsule_fini(info->mti_pill);
        if (info->mti_object != NULL) {
                mdt_object_put(info->mti_env, info->mti_object);
                info->mti_object = NULL;
@@ -3118,310 +2677,62 @@ static void mdt_thread_info_fini(struct mdt_thread_info *info)
        for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
                mdt_lock_handle_fini(&info->mti_lh[i]);
        info->mti_env = NULL;
+       info->mti_pill = NULL;
+       info->mti_exp = NULL;
 
        if (unlikely(info->mti_big_buf.lb_buf != NULL))
                lu_buf_free(&info->mti_big_buf);
 }
 
-static int mdt_filter_recovery_request(struct ptlrpc_request *req,
-                                       struct obd_device *obd, int *process)
-{
-        switch (lustre_msg_get_opc(req->rq_reqmsg)) {
-        case MDS_CONNECT: /* This will never get here, but for completeness. */
-        case OST_CONNECT: /* This will never get here, but for completeness. */
-        case MDS_DISCONNECT:
-        case OST_DISCONNECT:
-       case OBD_IDX_READ:
-               *process = 1;
-               RETURN(0);
-
-        case MDS_CLOSE:
-        case MDS_DONE_WRITING:
-        case MDS_SYNC: /* used in unmounting */
-        case OBD_PING:
-        case MDS_REINT:
-       case UPDATE_OBJ:
-        case SEQ_QUERY:
-        case FLD_QUERY:
-        case LDLM_ENQUEUE:
-                *process = target_queue_recovery_request(req, obd);
-                RETURN(0);
-
-        default:
-                DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
-                *process = -EAGAIN;
-                RETURN(0);
-        }
-}
-
-/*
- * Handle recovery. Return:
- *        +1: continue request processing;
- *       -ve: abort immediately with the given error code;
- *         0: send reply with error code in req->rq_status;
- */
-static int mdt_recovery(struct mdt_thread_info *info)
-{
-        struct ptlrpc_request *req = mdt_info_req(info);
-        struct obd_device *obd;
-
-        ENTRY;
-
-        switch (lustre_msg_get_opc(req->rq_reqmsg)) {
-        case MDS_CONNECT:
-        case SEC_CTX_INIT:
-        case SEC_CTX_INIT_CONT:
-        case SEC_CTX_FINI:
-                {
-#if 0
-                        int rc;
-
-                        rc = mdt_handle_idmap(info);
-                        if (rc)
-                                RETURN(rc);
-                        else
-#endif
-                                RETURN(+1);
-                }
-        }
-
-        if (unlikely(!class_connected_export(req->rq_export))) {
-               CDEBUG(D_HA, "operation %d on unconnected MDS from %s\n",
-                      lustre_msg_get_opc(req->rq_reqmsg),
-                      libcfs_id2str(req->rq_peer));
-                /* FIXME: For CMD cleanup, when mds_B stop, the req from
-                 * mds_A will get -ENOTCONN(especially for ping req),
-                 * which will cause that mds_A deactive timeout, then when
-                 * mds_A cleanup, the cleanup process will be suspended since
-                 * deactive timeout is not zero.
-                 */
-                req->rq_status = -ENOTCONN;
-                target_send_reply(req, -ENOTCONN, info->mti_fail_id);
-                RETURN(0);
-        }
-
-        /* sanity check: if the xid matches, the request must be marked as a
-         * resent or replayed */
-        if (req_xid_is_last(req)) {
-                if (!(lustre_msg_get_flags(req->rq_reqmsg) &
-                      (MSG_RESENT | MSG_REPLAY))) {
-                        DEBUG_REQ(D_WARNING, req, "rq_xid "LPU64" matches last_xid, "
-                                  "expected REPLAY or RESENT flag (%x)", req->rq_xid,
-                                  lustre_msg_get_flags(req->rq_reqmsg));
-                        LBUG();
-                        req->rq_status = -ENOTCONN;
-                        RETURN(-ENOTCONN);
-                }
-        }
-
-        /* else: note the opposite is not always true; a RESENT req after a
-         * failover will usually not match the last_xid, since it was likely
-         * never committed. A REPLAYed request will almost never match the
-         * last xid, however it could for a committed, but still retained,
-         * open. */
-
-        obd = req->rq_export->exp_obd;
-
-        /* Check for aborted recovery... */
-        if (unlikely(obd->obd_recovering)) {
-                int rc;
-                int should_process;
-                DEBUG_REQ(D_INFO, req, "Got new replay");
-                rc = mdt_filter_recovery_request(req, obd, &should_process);
-                if (rc != 0 || !should_process)
-                        RETURN(rc);
-                else if (should_process < 0) {
-                        req->rq_status = should_process;
-                        rc = ptlrpc_error(req);
-                        RETURN(rc);
-                }
-        }
-        RETURN(+1);
-}
-
-static int mdt_msg_check_version(struct lustre_msg *msg)
+struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
 {
-        int rc;
+       struct mdt_thread_info  *mti;
+       struct lustre_capa      *lc;
 
-        switch (lustre_msg_get_opc(msg)) {
-        case MDS_CONNECT:
-        case MDS_DISCONNECT:
-        case OBD_PING:
-        case SEC_CTX_INIT:
-        case SEC_CTX_INIT_CONT:
-        case SEC_CTX_FINI:
-       case OBD_IDX_READ:
-                rc = lustre_msg_check_version(msg, LUSTRE_OBD_VERSION);
-                if (rc)
-                        CERROR("bad opc %u version %08x, expecting %08x\n",
-                               lustre_msg_get_opc(msg),
-                               lustre_msg_get_version(msg),
-                               LUSTRE_OBD_VERSION);
-                break;
-        case MDS_GETSTATUS:
-        case MDS_GETATTR:
-        case MDS_GETATTR_NAME:
-        case MDS_STATFS:
-        case MDS_READPAGE:
-        case MDS_WRITEPAGE:
-        case MDS_IS_SUBDIR:
-        case MDS_REINT:
-        case MDS_CLOSE:
-        case MDS_DONE_WRITING:
-        case MDS_PIN:
-        case MDS_SYNC:
-        case MDS_GETXATTR:
-        case MDS_SETXATTR:
-        case MDS_SET_INFO:
-        case MDS_GET_INFO:
-       case MDS_HSM_PROGRESS:
-       case MDS_HSM_REQUEST:
-       case MDS_HSM_CT_REGISTER:
-       case MDS_HSM_CT_UNREGISTER:
-       case MDS_HSM_STATE_GET:
-       case MDS_HSM_STATE_SET:
-       case MDS_HSM_ACTION:
-        case MDS_QUOTACHECK:
-        case MDS_QUOTACTL:
-       case UPDATE_OBJ:
-       case MDS_SWAP_LAYOUTS:
-        case QUOTA_DQACQ:
-        case QUOTA_DQREL:
-        case SEQ_QUERY:
-        case FLD_QUERY:
-                rc = lustre_msg_check_version(msg, LUSTRE_MDS_VERSION);
-                if (rc)
-                        CERROR("bad opc %u version %08x, expecting %08x\n",
-                               lustre_msg_get_opc(msg),
-                               lustre_msg_get_version(msg),
-                               LUSTRE_MDS_VERSION);
-                break;
-        case LDLM_ENQUEUE:
-        case LDLM_CONVERT:
-        case LDLM_BL_CALLBACK:
-        case LDLM_CP_CALLBACK:
-                rc = lustre_msg_check_version(msg, LUSTRE_DLM_VERSION);
-                if (rc)
-                        CERROR("bad opc %u version %08x, expecting %08x\n",
-                               lustre_msg_get_opc(msg),
-                               lustre_msg_get_version(msg),
-                               LUSTRE_DLM_VERSION);
-                break;
-        case OBD_LOG_CANCEL:
-        case LLOG_ORIGIN_HANDLE_CREATE:
-        case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
-        case LLOG_ORIGIN_HANDLE_READ_HEADER:
-        case LLOG_ORIGIN_HANDLE_CLOSE:
-        case LLOG_ORIGIN_HANDLE_DESTROY:
-        case LLOG_ORIGIN_HANDLE_PREV_BLOCK:
-        case LLOG_CATINFO:
-                rc = lustre_msg_check_version(msg, LUSTRE_LOG_VERSION);
-                if (rc)
-                        CERROR("bad opc %u version %08x, expecting %08x\n",
-                               lustre_msg_get_opc(msg),
-                               lustre_msg_get_version(msg),
-                               LUSTRE_LOG_VERSION);
-                break;
-        default:
-                CERROR("MDS unknown opcode %d\n", lustre_msg_get_opc(msg));
-                rc = -ENOTSUPP;
-        }
-        return rc;
-}
+       mti = mdt_th_info(tsi->tsi_env);
+       LASSERT(mti != NULL);
 
-static int mdt_handle0(struct ptlrpc_request *req,
-                       struct mdt_thread_info *info,
-                       struct mdt_opc_slice *supported)
-{
-        struct mdt_handler *h;
-        struct lustre_msg  *msg;
-        int                 rc;
+       mdt_thread_info_init(tgt_ses_req(tsi), mti);
+       if (tsi->tsi_corpus != NULL) {
+               struct req_capsule *pill = tsi->tsi_pill;
 
-        ENTRY;
+               mti->mti_object = mdt_obj(tsi->tsi_corpus);
+               lu_object_get(tsi->tsi_corpus);
 
-        if (OBD_FAIL_CHECK_ORSET(OBD_FAIL_MDS_ALL_REQUEST_NET, OBD_FAIL_ONCE))
-                RETURN(0);
+               /*
+                * XXX: must be part of tgt_mdt_body_unpack but moved here
+                * due to mdt_set_capainfo().
+                */
+               if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
+                   req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
+                       lc = req_capsule_client_get(pill, &RMF_CAPA1);
+                       mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->fid1, lc);
+               }
+       }
+       mti->mti_body = tsi->tsi_mdt_body;
+       mti->mti_dlm_req = tsi->tsi_dlm_req;
 
-        LASSERT(current->journal_info == NULL);
-
-        msg = req->rq_reqmsg;
-        rc = mdt_msg_check_version(msg);
-        if (likely(rc == 0)) {
-                rc = mdt_recovery(info);
-                if (likely(rc == +1)) {
-                        h = mdt_handler_find(lustre_msg_get_opc(msg),
-                                             supported);
-                        if (likely(h != NULL)) {
-                                rc = mdt_req_handle(info, h, req);
-                        } else {
-                                CERROR("The unsupported opc: 0x%x\n",
-                                       lustre_msg_get_opc(msg) );
-                                req->rq_status = -ENOTSUPP;
-                                rc = ptlrpc_error(req);
-                                RETURN(rc);
-                        }
-                }
-        } else
-                CERROR(LUSTRE_MDT_NAME" drops mal-formed request\n");
-        RETURN(rc);
+       return mti;
 }
 
-/*
- * MDT handler function called by ptlrpc service thread when request comes.
- *
- * XXX common "target" functionality should be factored into separate module
- * shared by mdt, ost and stand-alone services like fld.
- */
-int mdt_handle_common(struct ptlrpc_request *req,
-                     struct mdt_opc_slice *supported)
+int mdt_tgt_connect(struct tgt_session_info *tsi)
 {
-        struct lu_env          *env;
-        struct mdt_thread_info *info;
-        int                     rc;
-        ENTRY;
-
-        env = req->rq_svc_thread->t_env;
-       /* Refill(initilize) the context(mdt_thread_info), in case it is
-        * not initialized yet. Usually it happens during start up, after
-        * MDS(ptlrpc threads) is start up, it gets the first CONNECT request,
-        * before MDT_thread_info is initialized */
-       lu_env_refill(env);
-        LASSERT(env != NULL);
-        LASSERT(env->le_ses != NULL);
-        LASSERT(env->le_ctx.lc_thread == req->rq_svc_thread);
-        info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
-        LASSERT(info != NULL);
-
-        mdt_thread_info_init(req, info);
-
-        rc = mdt_handle0(req, info, supported);
-
-        mdt_thread_info_fini(info);
-        RETURN(rc);
-}
+       struct ptlrpc_request   *req = tgt_ses_req(tsi);
+       int                      rc;
 
-/*
- * This is called from recovery code as handler of _all_ RPC types, FLD and SEQ
- * as well.
- */
-int mdt_recovery_handle(struct ptlrpc_request *req)
-{
-        int rc;
-        ENTRY;
+       ENTRY;
 
-        switch (lustre_msg_get_opc(req->rq_reqmsg)) {
-        case FLD_QUERY:
-                rc = mdt_handle_common(req, mdt_fld_handlers);
-                break;
-        case SEQ_QUERY:
-                rc = mdt_handle_common(req, mdt_seq_handlers);
-                break;
-        default:
-                rc = mdt_handle_common(req, mdt_regular_handlers);
-                break;
-        }
+       rc = tgt_connect(tsi);
+       if (rc != 0)
+               RETURN(rc);
 
-        RETURN(rc);
+       rc = mdt_init_idmap(tsi);
+       if (rc != 0)
+               GOTO(err, rc);
+       RETURN(0);
+err:
+       obd_disconnect(class_export_get(req->rq_export));
+       return rc;
 }
 
 enum mdt_it_code {
@@ -3443,6 +2754,12 @@ static int mdt_intent_getattr(enum mdt_it_code opcode,
                               struct mdt_thread_info *info,
                               struct ldlm_lock **,
                              __u64);
+
+static int mdt_intent_getxattr(enum mdt_it_code opcode,
+                               struct mdt_thread_info *info,
+                               struct ldlm_lock **lockp,
+                               __u64 flags);
+
 static int mdt_intent_layout(enum mdt_it_code opcode,
                             struct mdt_thread_info *info,
                             struct ldlm_lock **,
@@ -3470,7 +2787,14 @@ static struct mdt_it_flavor {
         },
         [MDT_IT_OCREAT]   = {
                 .it_fmt   = &RQF_LDLM_INTENT,
-                .it_flags = MUTABOR,
+               /*
+                * OCREAT is not a MUTABOR request as if the file
+                * already exists.
+                * We do the extra check of OBD_CONNECT_RDONLY in
+                * mdt_reint_open() when we really need to create
+                * the object.
+                */
+               .it_flags = 0,
                 .it_act   = mdt_intent_reint,
                 .it_reint = REINT_OPEN
         },
@@ -3507,9 +2831,9 @@ static struct mdt_it_flavor {
                 .it_act   = NULL
         },
         [MDT_IT_GETXATTR] = {
-                .it_fmt   = NULL,
-                .it_flags = 0,
-                .it_act   = NULL
+               .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
+               .it_flags = HABEO_CORPUS,
+               .it_act   = mdt_intent_getxattr
         },
        [MDT_IT_LAYOUT] = {
                .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
@@ -3660,6 +2984,44 @@ static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
                   remote_hdl.cookie);
 }
 
+static int mdt_intent_getxattr(enum mdt_it_code opcode,
+                               struct mdt_thread_info *info,
+                               struct ldlm_lock **lockp,
+                               __u64 flags)
+{
+       struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
+       struct ldlm_reply      *ldlm_rep = NULL;
+       int rc, grc;
+
+       /*
+        * Initialize lhc->mlh_reg_lh either from a previously granted lock
+        * (for the resend case) or a new lock. Below we will use it to
+        * replace the original lock.
+        */
+       mdt_intent_fixup_resent(info, *lockp, NULL, lhc);
+       if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
+               mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
+               rc = mdt_object_lock(info, info->mti_object, lhc,
+                                       MDS_INODELOCK_XATTR,
+                                       MDT_LOCAL_LOCK);
+               if (rc)
+                       return rc;
+       }
+
+       grc = mdt_getxattr(info);
+
+       rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
+
+       if (mdt_info_req(info)->rq_repmsg != NULL)
+               ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
+       if (ldlm_rep == NULL)
+               RETURN(err_serious(-EFAULT));
+
+       ldlm_rep->lock_policy_res2 = grc;
+
+       return rc;
+}
+
 static int mdt_intent_getattr(enum mdt_it_code opcode,
                               struct mdt_thread_info *info,
                               struct ldlm_lock **lockp,
@@ -3805,7 +3167,7 @@ static int mdt_intent_reint(enum mdt_it_code opcode,
 
         ENTRY;
 
-        opc = mdt_reint_opcode(info, intent_fmts);
+       opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
         if (opc < 0)
                 RETURN(opc);
 
@@ -3977,28 +3339,30 @@ static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
                        rep->lock_policy_res2 =
                                ptlrpc_status_hton(rep->lock_policy_res2);
                }
-        } else {
-                rc = -EOPNOTSUPP;
-        }
-        RETURN(rc);
+       } else {
+               rc = -EPROTO;
+       }
+       RETURN(rc);
 }
 
 static int mdt_intent_policy(struct ldlm_namespace *ns,
                              struct ldlm_lock **lockp, void *req_cookie,
                             ldlm_mode_t mode, __u64 flags, void *data)
 {
-        struct mdt_thread_info *info;
-        struct ptlrpc_request  *req  =  req_cookie;
-        struct ldlm_intent     *it;
-        struct req_capsule     *pill;
-        int rc;
+       struct tgt_session_info *tsi;
+       struct mdt_thread_info  *info;
+       struct ptlrpc_request   *req  =  req_cookie;
+       struct ldlm_intent      *it;
+       struct req_capsule      *pill;
+       int rc;
 
-        ENTRY;
+       ENTRY;
 
-        LASSERT(req != NULL);
+       LASSERT(req != NULL);
 
-        info = lu_context_key_get(&req->rq_svc_thread->t_env->le_ctx,
-                                  &mdt_thread_key);
+       tsi = tgt_ses_info(req->rq_svc_thread->t_env);
+
+       info = tsi2mdt_info(tsi);
         LASSERT(info != NULL);
         pill = info->mti_pill;
         LASSERT(pill->rc_req == req);
@@ -4030,100 +3394,205 @@ static int mdt_intent_policy(struct ldlm_namespace *ns,
                 if (rc)
                         rc = err_serious(rc);
         }
-        RETURN(rc);
+       mdt_thread_info_fini(info);
+       RETURN(rc);
 }
 
-static int mdt_seq_fini(const struct lu_env *env,
-                        struct mdt_device *m)
-{
-       return seq_site_fini(env, mdt_seq_site(m));
+static void mdt_deregister_seq_exp(struct mdt_device *mdt)
+{
+       struct seq_server_site  *ss = mdt_seq_site(mdt);
+
+       if (ss->ss_node_id == 0)
+               return;
+
+       if (ss->ss_client_seq != NULL) {
+               lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
+               ss->ss_client_seq->lcs_exp = NULL;
+       }
+
+       if (ss->ss_server_fld != NULL) {
+               lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
+               ss->ss_server_fld->lsf_control_exp = NULL;
+       }
+}
+
+static void mdt_seq_fini_cli(struct mdt_device *mdt)
+{
+       struct seq_server_site *ss = mdt_seq_site(mdt);
+
+       if (ss == NULL)
+               return;
+
+       if (ss->ss_server_seq == NULL)
+               seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
+
+       return;
+}
+
+static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
+{
+       mdt_seq_fini_cli(mdt);
+       mdt_deregister_seq_exp(mdt);
+
+       return seq_site_fini(env, mdt_seq_site(mdt));
+}
+
+/**
+ * It will retrieve its FLDB entries from MDT0, and it only happens
+ * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
+ * and it needs to refresh FLDB from the MDT0.
+ **/
+static int mdt_register_lwp_callback(void *data)
+{
+       struct lu_env           env;
+       struct mdt_device       *mdt = data;
+       struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
+       int                     rc;
+       ENTRY;
+
+       LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
+
+       if (!likely(fld->lsf_new))
+               RETURN(0);
+
+       rc = lu_env_init(&env, LCT_MD_THREAD);
+       if (rc) {
+               CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
+               RETURN(rc);
+       }
+
+       rc = fld_update_from_controller(&env, fld);
+       if (rc != 0) {
+               CERROR("%s: cannot update controller: rc = %d\n",
+                      mdt_obd_name(mdt), rc);
+               GOTO(out, rc);
+       }
+out:
+       lu_env_fini(&env);
+       RETURN(rc);
+}
+
+static int mdt_register_seq_exp(struct mdt_device *mdt)
+{
+       struct seq_server_site  *ss = mdt_seq_site(mdt);
+       char                    *lwp_name = NULL;
+       int                     rc;
+
+       if (ss->ss_node_id == 0)
+               return 0;
+
+       OBD_ALLOC(lwp_name, MAX_OBD_NAME);
+       if (lwp_name == NULL)
+               GOTO(out_free, rc = -ENOMEM);
+
+       rc = tgt_name2lwpname(mdt_obd_name(mdt), lwp_name);
+       if (rc != 0)
+               GOTO(out_free, rc);
+
+       rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
+                                     NULL, NULL);
+       if (rc != 0)
+               GOTO(out_free, rc);
+
+       rc = lustre_register_lwp_item(lwp_name,
+                                     &ss->ss_server_fld->lsf_control_exp,
+                                     mdt_register_lwp_callback, mdt);
+       if (rc != 0) {
+               lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
+               ss->ss_client_seq->lcs_exp = NULL;
+               GOTO(out_free, rc);
+       }
+out_free:
+       if (lwp_name != NULL)
+               OBD_FREE(lwp_name, MAX_OBD_NAME);
+
+       return rc;
 }
 
-static int mdt_seq_init(const struct lu_env *env,
-                        const char *uuid,
-                        struct mdt_device *m)
+/*
+ * Init client sequence manager which is used by local MDS to talk to sequence
+ * controller on remote node.
+ */
+static int mdt_seq_init_cli(const struct lu_env *env, struct mdt_device *mdt)
 {
-       struct seq_server_site *ss;
-       char *prefix;
-       int rc;
+       struct seq_server_site  *ss = mdt_seq_site(mdt);
+       int                     rc;
+       char                    *prefix;
        ENTRY;
 
-       ss = mdt_seq_site(m);
-
-       /*
-        * This is sequence-controller node. Init seq-controller server on local
-        * MDT.
-        */
-       if (ss->ss_node_id == 0) {
-               LASSERT(ss->ss_control_seq == NULL);
-
-               OBD_ALLOC_PTR(ss->ss_control_seq);
-               if (ss->ss_control_seq == NULL)
-                       RETURN(-ENOMEM);
+       /* check if this is adding the first MDC and controller is not yet
+        * initialized. */
+       OBD_ALLOC_PTR(ss->ss_client_seq);
+       if (ss->ss_client_seq == NULL)
+               RETURN(-ENOMEM);
 
-               rc = seq_server_init(ss->ss_control_seq,
-                                    m->mdt_bottom, uuid,
-                                    LUSTRE_SEQ_CONTROLLER,
-                                    ss,
-                                    env);
+       OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
+       if (prefix == NULL) {
+               OBD_FREE_PTR(ss->ss_client_seq);
+               ss->ss_client_seq = NULL;
+               RETURN(-ENOMEM);
+       }
 
-               if (rc)
-                       GOTO(out_seq_fini, rc);
+       /* Note: seq_client_fini will be called in seq_site_fini */
+       snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s", mdt_obd_name(mdt));
+       rc = seq_client_init(ss->ss_client_seq, NULL, LUSTRE_SEQ_METADATA,
+                            prefix, ss->ss_node_id == 0 ?  ss->ss_control_seq :
+                                                           NULL);
+       OBD_FREE(prefix, MAX_OBD_NAME + 5);
+       if (rc != 0) {
+               OBD_FREE_PTR(ss->ss_client_seq);
+               ss->ss_client_seq = NULL;
+               RETURN(rc);
+       }
 
-               OBD_ALLOC_PTR(ss->ss_client_seq);
-               if (ss->ss_client_seq == NULL)
-                       GOTO(out_seq_fini, rc = -ENOMEM);
+       rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
 
-               OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
-               if (prefix == NULL) {
-                       OBD_FREE_PTR(ss->ss_client_seq);
-                       GOTO(out_seq_fini, rc = -ENOMEM);
-               }
+       RETURN(rc);
+}
 
-               snprintf(prefix, MAX_OBD_NAME + 5, "ctl-%s",
-                        uuid);
+static int mdt_seq_init(const struct lu_env *env, struct mdt_device *mdt)
+{
+       struct seq_server_site  *ss;
+       int                     rc;
+       ENTRY;
 
-               /*
-                * Init seq-controller client after seq-controller server is
-                * ready. Pass ss->ss_control_seq to it for direct talking.
-                */
-               rc = seq_client_init(ss->ss_client_seq, NULL,
-                                    LUSTRE_SEQ_METADATA, prefix,
-                                    ss->ss_control_seq);
-               OBD_FREE(prefix, MAX_OBD_NAME + 5);
+       ss = mdt_seq_site(mdt);
+       /* init sequence controller server(MDT0) */
+       if (ss->ss_node_id == 0) {
+               OBD_ALLOC_PTR(ss->ss_control_seq);
+               if (ss->ss_control_seq == NULL)
+                       RETURN(-ENOMEM);
 
+               rc = seq_server_init(env, ss->ss_control_seq, mdt->mdt_bottom,
+                                    mdt_obd_name(mdt), LUSTRE_SEQ_CONTROLLER,
+                                    ss);
                if (rc)
                        GOTO(out_seq_fini, rc);
        }
 
-       /* Init seq-server on local MDT */
-       LASSERT(ss->ss_server_seq == NULL);
-
+       /* Init normal sequence server */
        OBD_ALLOC_PTR(ss->ss_server_seq);
        if (ss->ss_server_seq == NULL)
                GOTO(out_seq_fini, rc = -ENOMEM);
 
-       rc = seq_server_init(ss->ss_server_seq,
-                            m->mdt_bottom, uuid,
-                            LUSTRE_SEQ_SERVER,
-                            ss,
-                            env);
+       rc = seq_server_init(env, ss->ss_server_seq, mdt->mdt_bottom,
+                            mdt_obd_name(mdt), LUSTRE_SEQ_SERVER, ss);
        if (rc)
-               GOTO(out_seq_fini, rc = -ENOMEM);
+               GOTO(out_seq_fini, rc);
 
-       /* Assign seq-controller client to local seq-server. */
-       if (ss->ss_node_id == 0) {
-               LASSERT(ss->ss_client_seq != NULL);
+       /* init seq client for seq server to talk to seq controller(MDT0) */
+       rc = mdt_seq_init_cli(env, mdt);
+       if (rc != 0)
+               GOTO(out_seq_fini, rc);
 
-               rc = seq_server_set_cli(ss->ss_server_seq,
-                                       ss->ss_client_seq,
-                                       env);
-       }
+       if (ss->ss_node_id != 0)
+               /* register controler export through lwp */
+               rc = mdt_register_seq_exp(mdt);
 
        EXIT;
 out_seq_fini:
        if (rc)
-               mdt_seq_fini(env, m);
+               mdt_seq_fini(env, mdt);
 
        return rc;
 }
@@ -4161,7 +3630,7 @@ static int mdt_fld_init(const struct lu_env *env,
                RETURN(rc = -ENOMEM);
 
        rc = fld_server_init(env, ss->ss_server_fld, m->mdt_bottom, uuid,
-                            ss->ss_node_id, LU_SEQ_RANGE_MDT);
+                            LU_SEQ_RANGE_MDT);
        if (rc) {
                OBD_FREE_PTR(ss->ss_server_fld);
                ss->ss_server_fld = NULL;
@@ -4344,7 +3813,7 @@ static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
        strcpy(name, dev);
        p = strstr(name, "-MDT");
        if (p == NULL)
-               GOTO(cleanup_mem, rc = -ENOMEM);
+               GOTO(free_bufs, rc = -ENOMEM);
        p[3] = 'D';
 
        snprintf(uuid, MAX_OBD_NAME, "%s_UUID", name);
@@ -4353,7 +3822,7 @@ static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
        if (lprof == NULL || lprof->lp_dt == NULL) {
                CERROR("can't find the profile: %s\n",
                       lustre_cfg_string(cfg, 0));
-               GOTO(cleanup_mem, rc = -EINVAL);
+               GOTO(free_bufs, rc = -EINVAL);
        }
 
        lustre_cfg_bufs_reset(bufs, name);
@@ -4392,13 +3861,13 @@ static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
        /* connect to MDD we just setup */
        rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_child_exp);
        if (rc)
-               RETURN(rc);
+               GOTO(class_detach, rc);
 
        site = mdt->mdt_child_exp->exp_obd->obd_lu_dev->ld_site;
        LASSERT(site);
        LASSERT(mdt_lu_site(mdt) == NULL);
-       mdt->mdt_md_dev.md_lu_dev.ld_site = site;
-       site->ls_top_dev = &mdt->mdt_md_dev.md_lu_dev;
+       mdt->mdt_lu_dev.ld_site = site;
+       site->ls_top_dev = &mdt->mdt_lu_dev;
        mdt->mdt_child = lu2md_dev(mdt->mdt_child_exp->exp_obd->obd_lu_dev);
 
 
@@ -4406,7 +3875,7 @@ static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
        snprintf(name, MAX_OBD_NAME, "%s-osd", dev);
        rc = mdt_connect_to_next(env, mdt, name, &mdt->mdt_bottom_exp);
        if (rc)
-               RETURN(rc);
+               GOTO(class_detach, rc);
        mdt->mdt_bottom =
                lu2dt_dev(mdt->mdt_bottom_exp->exp_obd->obd_lu_dev);
 
@@ -4415,7 +3884,7 @@ static int mdt_stack_init(const struct lu_env *env, struct mdt_device *mdt,
        if (rc != 0)
                CERROR("Failure to refill session: '%d'\n", rc);
 
-       lu_dev_add_linkage(site, &mdt->mdt_md_dev.md_lu_dev);
+       lu_dev_add_linkage(site, &mdt->mdt_lu_dev);
 
        EXIT;
 class_detach:
@@ -4526,7 +3995,7 @@ static int mdt_quota_init(const struct lu_env *env, struct mdt_device *mdt,
 
        /* configure local quota objects */
        rc = mdt->mdt_qmt_dev->ld_ops->ldo_prepare(env,
-                                                  &mdt->mdt_md_dev.md_lu_dev,
+                                                  &mdt->mdt_lu_dev,
                                                   mdt->mdt_qmt_dev);
        if (rc)
                GOTO(class_cleanup, rc);
@@ -4581,10 +4050,128 @@ static void mdt_quota_fini(const struct lu_env *env, struct mdt_device *mdt)
        EXIT;
 }
 
+/* mdt_getxattr() is used from mdt_intent_getxattr(), use this wrapper
+ * for now. This will be removed along with converting rest of MDT code
+ * to use tgt_session_info */
+int mdt_tgt_getxattr(struct tgt_session_info *tsi)
+{
+       struct mdt_thread_info  *info = tsi2mdt_info(tsi);
+       int                      rc;
+
+       rc = mdt_getxattr(info);
+
+       mdt_thread_info_fini(info);
+       return rc;
+}
+
+static struct tgt_handler mdt_tgt_handlers[] = {
+TGT_RPC_HANDLER(MDS_FIRST_OPC,
+               0,                      MDS_CONNECT,    mdt_tgt_connect,
+               &RQF_CONNECT, LUSTRE_OBD_VERSION),
+TGT_RPC_HANDLER(MDS_FIRST_OPC,
+               0,                      MDS_DISCONNECT, tgt_disconnect,
+               &RQF_MDS_DISCONNECT, LUSTRE_OBD_VERSION),
+TGT_RPC_HANDLER(MDS_FIRST_OPC,
+               HABEO_REFERO,           MDS_SET_INFO,   mdt_set_info,
+               &RQF_OBD_SET_INFO, LUSTRE_MDS_VERSION),
+TGT_MDT_HDL(0,                         MDS_GET_INFO,   mdt_get_info),
+TGT_MDT_HDL(0          | HABEO_REFERO, MDS_GETSTATUS,  mdt_getstatus),
+TGT_MDT_HDL(HABEO_CORPUS,              MDS_GETATTR,    mdt_getattr),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO,        MDS_GETATTR_NAME,
+                                                       mdt_getattr_name),
+TGT_MDT_HDL(HABEO_CORPUS,              MDS_GETXATTR,   mdt_tgt_getxattr),
+TGT_MDT_HDL(0          | HABEO_REFERO, MDS_STATFS,     mdt_statfs),
+TGT_MDT_HDL(0          | MUTABOR,      MDS_REINT,      mdt_reint),
+TGT_MDT_HDL(HABEO_CORPUS,              MDS_CLOSE,      mdt_close),
+TGT_MDT_HDL(HABEO_CORPUS,              MDS_DONE_WRITING,
+                                                       mdt_done_writing),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO,        MDS_READPAGE,   mdt_readpage),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO,        MDS_SYNC,       mdt_sync),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO,        MDS_IS_SUBDIR,  mdt_is_subdir),
+TGT_MDT_HDL(0,                         MDS_QUOTACTL,   mdt_quotactl),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
+                                                       mdt_hsm_progress),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
+                                                       mdt_hsm_ct_register),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
+                                                       mdt_hsm_ct_unregister),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
+                                                       mdt_hsm_state_get),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
+                                                       mdt_hsm_state_set),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_ACTION,        mdt_hsm_action),
+TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_REQUEST,
+                                                       mdt_hsm_request),
+TGT_MDT_HDL(HABEO_CORPUS|HABEO_REFERO | MUTABOR, MDS_SWAP_LAYOUTS,
+                                                       mdt_swap_layouts)
+};
+
+static struct tgt_handler mdt_sec_ctx_ops[] = {
+TGT_SEC_HDL_VAR(0,                     SEC_CTX_INIT,     mdt_sec_ctx_handle),
+TGT_SEC_HDL_VAR(0,                     SEC_CTX_INIT_CONT,mdt_sec_ctx_handle),
+TGT_SEC_HDL_VAR(0,                     SEC_CTX_FINI,     mdt_sec_ctx_handle)
+};
+
+static struct tgt_handler mdt_quota_ops[] = {
+TGT_QUOTA_HDL(HABEO_REFERO,            QUOTA_DQACQ,      mdt_quota_dqacq),
+};
+
+static struct tgt_opc_slice mdt_common_slice[] = {
+       {
+               .tos_opc_start  = MDS_FIRST_OPC,
+               .tos_opc_end    = MDS_LAST_OPC,
+               .tos_hs         = mdt_tgt_handlers
+       },
+       {
+               .tos_opc_start  = OBD_FIRST_OPC,
+               .tos_opc_end    = OBD_LAST_OPC,
+               .tos_hs         = tgt_obd_handlers
+       },
+       {
+               .tos_opc_start  = LDLM_FIRST_OPC,
+               .tos_opc_end    = LDLM_LAST_OPC,
+               .tos_hs         = tgt_dlm_handlers
+       },
+       {
+               .tos_opc_start  = SEC_FIRST_OPC,
+               .tos_opc_end    = SEC_LAST_OPC,
+               .tos_hs         = mdt_sec_ctx_ops
+       },
+       {
+               .tos_opc_start  = UPDATE_OBJ,
+               .tos_opc_end    = UPDATE_LAST_OPC,
+               .tos_hs         = tgt_out_handlers
+       },
+       {
+               .tos_opc_start  = FLD_FIRST_OPC,
+               .tos_opc_end    = FLD_LAST_OPC,
+               .tos_hs         = fld_handlers
+       },
+       {
+               .tos_opc_start  = SEQ_FIRST_OPC,
+               .tos_opc_end    = SEQ_LAST_OPC,
+               .tos_hs         = seq_handlers
+       },
+       {
+               .tos_opc_start  = QUOTA_DQACQ,
+               .tos_opc_end    = QUOTA_LAST_OPC,
+               .tos_hs         = mdt_quota_ops
+       },
+       {
+               .tos_opc_start  = LLOG_FIRST_OPC,
+               .tos_opc_end    = LLOG_LAST_OPC,
+               .tos_hs         = tgt_llog_handlers
+       },
+
+       {
+               .tos_hs         = NULL
+       }
+};
+
 static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
 {
-        struct md_device  *next = m->mdt_child;
-        struct lu_device  *d    = &m->mdt_md_dev.md_lu_dev;
+       struct md_device  *next = m->mdt_child;
+       struct lu_device  *d    = &m->mdt_lu_dev;
         struct obd_device *obd = mdt2obd_dev(m);
         ENTRY;
 
@@ -4592,8 +4179,14 @@ static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
 
         ping_evictor_stop();
 
-
        mdt_stack_pre_fini(env, m, md2lu_dev(m->mdt_child));
+
+       if (m->mdt_opts.mo_coordinator)
+               mdt_hsm_cdt_stop(m);
+
+       mdt_hsm_cdt_fini(m);
+
+       mdt_llog_ctxt_unclone(env, m, LLOG_AGENT_ORIG_CTXT);
         mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
         obd_exports_barrier(obd);
         obd_zombie_barrier();
@@ -4624,7 +4217,6 @@ static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
 
         mdt_seq_fini(env, m);
         mdt_fld_fini(env, m);
-        sptlrpc_rule_set_free(&m->mdt_sptlrpc_rset);
 
         next->md_ops->mdo_init_capa_ctxt(env, next, 0, 0, 0, NULL);
         cfs_timer_disarm(&m->mdt_ck_timer);
@@ -4637,35 +4229,11 @@ static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
 
        LASSERT(cfs_atomic_read(&d->ld_ref) == 0);
 
-       server_put_mount(mdt_obd_name(m), NULL);
+       server_put_mount(mdt_obd_name(m));
 
        EXIT;
 }
 
-static int mdt_adapt_sptlrpc_conf(struct obd_device *obd, int initial)
-{
-       struct mdt_device       *m = mdt_dev(obd->obd_lu_dev);
-       struct sptlrpc_rule_set  tmp_rset;
-       int                      rc;
-
-       sptlrpc_rule_set_init(&tmp_rset);
-       rc = sptlrpc_conf_target_get_rules(obd, &tmp_rset, initial);
-       if (rc) {
-               CERROR("mdt %s: failed get sptlrpc rules: %d\n",
-                      mdt_obd_name(m), rc);
-               return rc;
-       }
-
-       sptlrpc_target_update_exp_flavor(obd, &tmp_rset);
-
-       write_lock(&m->mdt_sptlrpc_lock);
-       sptlrpc_rule_set_free(&m->mdt_sptlrpc_rset);
-       m->mdt_sptlrpc_rset = tmp_rset;
-       write_unlock(&m->mdt_sptlrpc_lock);
-
-       return 0;
-}
-
 int mdt_postrecov(const struct lu_env *, struct mdt_device *);
 
 static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
@@ -4682,11 +4250,11 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
         const char                *identity_upcall = "NONE";
         struct md_device          *next;
         int                        rc;
-        int                        node_id;
+       long                       node_id;
         mntopt_t                   mntopts;
         ENTRY;
 
-        md_device_init(&m->mdt_md_dev, ldt);
+       lu_device_init(&m->mdt_lu_dev, ldt);
         /*
          * Environment (env) might be missing mdt_thread_key values at that
          * point, if device is allocated when mdt_thread_key is in QUIESCENT
@@ -4710,6 +4278,11 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
         m->mdt_som_conf = 0;
 
         m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
+
+       /* default is coordinator off, it is started through conf_param
+        * or /proc */
+       m->mdt_opts.mo_coordinator = 0;
+
        lmi = server_get_mount(dev);
         if (lmi == NULL) {
                 CERROR("Cannot get mount info for %s!\n", dev);
@@ -4720,15 +4293,9 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
                 LASSERT(num);
                 node_id = simple_strtol(num, NULL, 10);
                obd->u.obt.obt_magic = OBT_MAGIC;
-        }
-
-       rwlock_init(&m->mdt_sptlrpc_lock);
-        sptlrpc_rule_set_init(&m->mdt_sptlrpc_rset);
+       }
 
        spin_lock_init(&m->mdt_ioepoch_lock);
-        m->mdt_opts.mo_compat_resname = 0;
-        m->mdt_opts.mo_mds_capa = 1;
-        m->mdt_opts.mo_oss_capa = 1;
         m->mdt_capa_timeout = CAPA_TIMEOUT;
         m->mdt_capa_alg = CAPA_HMAC_ALG_SHA1;
         m->mdt_ck_timeout = CAPA_KEY_TIMEOUT;
@@ -4743,10 +4310,10 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        m->mdt_enable_remote_dir = 0;
        m->mdt_enable_remote_dir_gid = 0;
 
-        m->mdt_md_dev.md_lu_dev.ld_ops = &mdt_lu_ops;
-        m->mdt_md_dev.md_lu_dev.ld_obd = obd;
-        /* set this lu_device to obd, because error handling need it */
-        obd->obd_lu_dev = &m->mdt_md_dev.md_lu_dev;
+       m->mdt_lu_dev.ld_ops = &mdt_lu_ops;
+       m->mdt_lu_dev.ld_obd = obd;
+       /* Set this lu_device to obd for error handling purposes. */
+       obd->obd_lu_dev = &m->mdt_lu_dev;
 
        /* init the stack */
        rc = mdt_stack_init((struct lu_env *)env, m, cfg);
@@ -4780,15 +4347,11 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
                }
        }
 
-        rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom);
-        if (rc)
-                GOTO(err_fini_stack, rc);
-
        rc = mdt_fld_init(env, mdt_obd_name(m), m);
        if (rc)
-               GOTO(err_lut, rc);
+               GOTO(err_fini_stack, rc);
 
-       rc = mdt_seq_init(env, mdt_obd_name(m), m);
+       rc = mdt_seq_init(env, m);
        if (rc)
                GOTO(err_fini_fld, rc);
 
@@ -4810,27 +4373,44 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
 
         cfs_timer_init(&m->mdt_ck_timer, mdt_ck_timer_callback, m);
 
-        rc = mdt_ck_thread_start(m);
-        if (rc)
+       rc = mdt_hsm_cdt_init(m);
+       if (rc != 0) {
+               CERROR("%s: error initializing coordinator, rc %d\n",
+                      mdt_obd_name(m), rc);
                 GOTO(err_free_ns, rc);
+       }
 
-        rc = mdt_fs_setup(env, m, obd, lsi);
+        rc = mdt_ck_thread_start(m);
         if (rc)
-                GOTO(err_capa, rc);
+                GOTO(err_free_hsm, rc);
+
+       rc = tgt_init(env, &m->mdt_lut, obd, m->mdt_bottom, mdt_common_slice,
+                     OBD_FAIL_MDS_ALL_REQUEST_NET,
+                     OBD_FAIL_MDS_ALL_REPLY_NET);
+       if (rc)
+               GOTO(err_capa, rc);
+
+       rc = mdt_fs_setup(env, m, obd, lsi);
+       if (rc)
+               GOTO(err_tgt, rc);
 
-        mdt_adapt_sptlrpc_conf(obd, 1);
+       tgt_adapt_sptlrpc_conf(&m->mdt_lut, 1);
 
         next = m->mdt_child;
         rc = next->md_ops->mdo_iocontrol(env, next, OBD_IOC_GET_MNTOPT, 0,
                                          &mntopts);
         if (rc)
-               GOTO(err_llog_cleanup, rc);
+               GOTO(err_fs_cleanup, rc);
 
         if (mntopts & MNTOPT_USERXATTR)
                 m->mdt_opts.mo_user_xattr = 1;
         else
                 m->mdt_opts.mo_user_xattr = 0;
 
+       rc = next->md_ops->mdo_maxeasize_get(env, next, &m->mdt_max_ea_size);
+       if (rc)
+               GOTO(err_fs_cleanup, rc);
+
         if (mntopts & MNTOPT_ACL)
                 m->mdt_opts.mo_acl = 1;
         else
@@ -4847,7 +4427,7 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        if (IS_ERR(m->mdt_identity_cache)) {
                rc = PTR_ERR(m->mdt_identity_cache);
                m->mdt_identity_cache = NULL;
-               GOTO(err_llog_cleanup, rc);
+               GOTO(err_fs_cleanup, rc);
        }
 
         rc = mdt_procfs_init(m, dev);
@@ -4864,7 +4444,7 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
                           "mdt_ldlm_client", m->mdt_ldlm_client);
 
-        ping_evictor_start();
+       ping_evictor_start();
 
        /* recovery will be started upon mdt_prepare()
         * when the whole stack is complete and ready
@@ -4879,34 +4459,34 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
                 ldlm_timeout = MDS_LDLM_TIMEOUT_DEFAULT;
 
         RETURN(0);
-
 err_procfs:
-        mdt_procfs_fini(m);
+       mdt_procfs_fini(m);
 err_recovery:
-        target_recovery_fini(obd);
-        upcall_cache_cleanup(m->mdt_identity_cache);
-        m->mdt_identity_cache = NULL;
-err_llog_cleanup:
-        mdt_llog_ctxt_unclone(env, m, LLOG_CHANGELOG_ORIG_CTXT);
-        mdt_fs_cleanup(env, m);
+       target_recovery_fini(obd);
+       upcall_cache_cleanup(m->mdt_identity_cache);
+       m->mdt_identity_cache = NULL;
+err_fs_cleanup:
+       mdt_fs_cleanup(env, m);
+err_tgt:
+       tgt_fini(env, &m->mdt_lut);
 err_capa:
-        cfs_timer_disarm(&m->mdt_ck_timer);
-        mdt_ck_thread_stop(m);
+       cfs_timer_disarm(&m->mdt_ck_timer);
+       mdt_ck_thread_stop(m);
+err_free_hsm:
+       mdt_hsm_cdt_fini(m);
 err_free_ns:
-        ldlm_namespace_free(m->mdt_namespace, NULL, 0);
-        obd->obd_namespace = m->mdt_namespace = NULL;
+       ldlm_namespace_free(m->mdt_namespace, NULL, 0);
+       obd->obd_namespace = m->mdt_namespace = NULL;
 err_fini_seq:
        mdt_seq_fini(env, m);
 err_fini_fld:
        mdt_fld_fini(env, m);
-err_lut:
-       tgt_fini(env, &m->mdt_lut);
 err_fini_stack:
-        mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
+       mdt_stack_fini(env, m, md2lu_dev(m->mdt_child));
 err_lmi:
        if (lmi)
-               server_put_mount(dev, lmi->lmi_mnt);
-        return (rc);
+               server_put_mount(dev);
+       return(rc);
 }
 
 /* For interoperability, the left element is old parameter, the right one
@@ -4971,9 +4551,16 @@ static int mdt_process_config(const struct lu_env *env,
                lprocfs_mdt_init_vars(&lvars);
                rc = class_process_proc_param(PARAM_MDT, lvars.obd_vars,
                                              cfg, obd);
-               if (rc > 0 || rc == -ENOSYS)
-                       /* we don't understand; pass it on */
-                       rc = next->ld_ops->ldo_process_config(env, next, cfg);
+               if (rc > 0 || rc == -ENOSYS) {
+                       /* is it an HSM var ? */
+                       rc = class_process_proc_param(PARAM_HSM,
+                                                     hsm_cdt_get_proc_vars(),
+                                                     cfg, obd);
+                       if (rc > 0 || rc == -ENOSYS)
+                               /* we don't understand; pass it on */
+                               rc = next->ld_ops->ldo_process_config(env, next,
+                                                                     cfg);
+               }
 
                if (old_cfg != NULL)
                        lustre_cfg_free(cfg);
@@ -4996,12 +4583,12 @@ static struct lu_object *mdt_object_alloc(const struct lu_env *env,
 
         ENTRY;
 
-       OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, CFS_ALLOC_IO);
+       OBD_SLAB_ALLOC_PTR_GFP(mo, mdt_object_kmem, __GFP_IO);
         if (mo != NULL) {
                 struct lu_object *o;
                 struct lu_object_header *h;
 
-                o = &mo->mot_obj.mo_lu;
+               o = &mo->mot_obj;
                 h = &mo->mot_header;
                 lu_object_header_init(h);
                 lu_object_init(o, h, d);
@@ -5009,9 +4596,10 @@ static struct lu_object *mdt_object_alloc(const struct lu_env *env,
                 o->lo_ops = &mdt_obj_ops;
                mutex_init(&mo->mot_ioepoch_mutex);
                mutex_init(&mo->mot_lov_mutex);
-                RETURN(o);
-        } else
-                RETURN(NULL);
+               init_rwsem(&mo->mot_open_sem);
+               RETURN(o);
+       }
+       RETURN(NULL);
 }
 
 static int mdt_object_init(const struct lu_env *env, struct lu_object *o,
@@ -5046,11 +4634,14 @@ static void mdt_object_free(const struct lu_env *env, struct lu_object *o)
         CDEBUG(D_INFO, "object free, fid = "DFID"\n",
                PFID(lu_object_fid(o)));
 
-        lu_object_fini(o);
-        lu_object_header_fini(h);
+       LASSERT(atomic_read(&mo->mot_open_count) == 0);
+       LASSERT(atomic_read(&mo->mot_lease_count) == 0);
+
+       lu_object_fini(o);
+       lu_object_header_fini(h);
        OBD_SLAB_FREE_PTR(mo, mdt_object_kmem);
 
-        EXIT;
+       EXIT;
 }
 
 static int mdt_object_print(const struct lu_env *env, void *cookie,
@@ -5085,6 +4676,10 @@ static int mdt_prepare(const struct lu_env *env,
        if (rc)
                RETURN(rc);
 
+       rc = mdt_llog_ctxt_clone(env, mdt, LLOG_AGENT_ORIG_CTXT);
+       if (rc)
+               RETURN(rc);
+
        lsp.lsp_start = NULL;
        lsp.lsp_namespace = mdt->mdt_namespace;
        rc = mdt->mdt_child->md_ops->mdo_iocontrol(env, mdt->mdt_child,
@@ -5102,8 +4697,9 @@ static int mdt_prepare(const struct lu_env *env,
                if (rc)
                        RETURN(rc);
        }
+
        LASSERT(!test_bit(MDT_FL_CFGLOG, &mdt->mdt_state));
-       target_recovery_init(&mdt->mdt_lut, mdt_recovery_handle);
+       target_recovery_init(&mdt->mdt_lut, tgt_request_handle);
        set_bit(MDT_FL_CFGLOG, &mdt->mdt_state);
        LASSERT(obd->obd_no_conn);
        spin_lock(&obd->obd_dev_lock);
@@ -5134,18 +4730,16 @@ static int mdt_obd_set_info_async(const struct lu_env *env,
                                   __u32 vallen, void *val,
                                   struct ptlrpc_request_set *set)
 {
-        struct obd_device     *obd = exp->exp_obd;
-        int                    rc;
-        ENTRY;
+       int rc;
 
-        LASSERT(obd);
+       ENTRY;
 
-        if (KEY_IS(KEY_SPTLRPC_CONF)) {
-                rc = mdt_adapt_sptlrpc_conf(obd, 0);
-                RETURN(rc);
-        }
+       if (KEY_IS(KEY_SPTLRPC_CONF)) {
+               rc = tgt_adapt_sptlrpc_conf(class_exp2tgt(exp), 0);
+               RETURN(rc);
+       }
 
-        RETURN(0);
+       RETURN(0);
 }
 
 /**
@@ -5224,8 +4818,6 @@ static int mdt_connect_internal(struct obd_export *exp,
        }
 
        data->ocd_version = LUSTRE_VERSION_CODE;
-       exp->exp_connect_data = *data;
-       exp->exp_mdt_data.med_ibits_known = data->ocd_ibits_known;
 
        if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
                CWARN("%s: MDS requires FID support, but client not\n",
@@ -5252,51 +4844,9 @@ static int mdt_connect_internal(struct obd_export *exp,
                }
        }
 
-       return 0;
-}
-
-static int mdt_connect_check_sptlrpc(struct mdt_device *mdt,
-                                    struct obd_export *exp,
-                                    struct ptlrpc_request *req)
-{
-       struct sptlrpc_flavor   flvr;
-       int                     rc = 0;
-
-       if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
-               read_lock(&mdt->mdt_sptlrpc_lock);
-               sptlrpc_target_choose_flavor(&mdt->mdt_sptlrpc_rset,
-                                            req->rq_sp_from,
-                                            req->rq_peer.nid,
-                                            &flvr);
-               read_unlock(&mdt->mdt_sptlrpc_lock);
-
-               spin_lock(&exp->exp_lock);
-
-                exp->exp_sp_peer = req->rq_sp_from;
-                exp->exp_flvr = flvr;
-
-                if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
-                    exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
-                        CERROR("unauthorized rpc flavor %x from %s, "
-                               "expect %x\n", req->rq_flvr.sf_rpc,
-                               libcfs_nid2str(req->rq_peer.nid),
-                               exp->exp_flvr.sf_rpc);
-                        rc = -EACCES;
-                }
-
-               spin_unlock(&exp->exp_lock);
-        } else {
-                if (exp->exp_sp_peer != req->rq_sp_from) {
-                        CERROR("RPC source %s doesn't match %s\n",
-                               sptlrpc_part2name(req->rq_sp_from),
-                               sptlrpc_part2name(exp->exp_sp_peer));
-                        rc = -EACCES;
-                } else {
-                        rc = sptlrpc_target_export_check(exp, req);
-                }
-        }
+       data->ocd_max_easize = mdt->mdt_max_ea_size;
 
-        return rc;
+       return 0;
 }
 
 /* mds_connect copy */
@@ -5306,11 +4856,9 @@ static int mdt_obd_connect(const struct lu_env *env,
                            struct obd_connect_data *data,
                            void *localdata)
 {
-        struct mdt_thread_info *info;
         struct obd_export      *lexp;
         struct lustre_handle    conn = { 0 };
         struct mdt_device      *mdt;
-        struct ptlrpc_request  *req;
         int                     rc;
         ENTRY;
 
@@ -5318,18 +4866,18 @@ static int mdt_obd_connect(const struct lu_env *env,
         if (!exp || !obd || !cluuid)
                 RETURN(-EINVAL);
 
-        info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
-        req = info->mti_pill->rc_req;
-        mdt = mdt_dev(obd->obd_lu_dev);
+       mdt = mdt_dev(obd->obd_lu_dev);
 
        /*
         * first, check whether the stack is ready to handle requests
         * XXX: probably not very appropriate method is used now
         *      at some point we should find a better one
         */
-       if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) &&
+       if (!test_bit(MDT_FL_SYNCED, &mdt->mdt_state) && data != NULL &&
            !(data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT)) {
-               rc = obd_health_check(env, mdt->mdt_child_exp->exp_obd);
+               rc = obd_get_info(env, mdt->mdt_child_exp,
+                                 sizeof(KEY_OSP_CONNECTED),
+                                 KEY_OSP_CONNECTED, NULL, NULL, NULL);
                if (rc)
                        RETURN(-EAGAIN);
                set_bit(MDT_FL_SYNCED, &mdt->mdt_state);
@@ -5342,26 +4890,17 @@ static int mdt_obd_connect(const struct lu_env *env,
         lexp = class_conn2export(&conn);
         LASSERT(lexp != NULL);
 
-        rc = mdt_connect_check_sptlrpc(mdt, lexp, req);
-        if (rc)
-                GOTO(out, rc);
-
-        if (OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
-                lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
-
         rc = mdt_connect_internal(lexp, mdt, data);
         if (rc == 0) {
                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
 
                 LASSERT(lcd);
-               info->mti_exp = lexp;
                memcpy(lcd->lcd_uuid, cluuid, sizeof lcd->lcd_uuid);
                rc = tgt_client_new(env, lexp);
                 if (rc == 0)
                         mdt_export_stats_init(obd, lexp, localdata);
         }
 
-out:
         if (rc != 0) {
                 class_disconnect(lexp);
                 *exp = NULL;
@@ -5378,23 +4917,12 @@ static int mdt_obd_reconnect(const struct lu_env *env,
                              struct obd_connect_data *data,
                              void *localdata)
 {
-        struct mdt_thread_info *info;
-        struct mdt_device      *mdt;
-        struct ptlrpc_request  *req;
         int                     rc;
         ENTRY;
 
         if (exp == NULL || obd == NULL || cluuid == NULL)
                 RETURN(-EINVAL);
 
-        info = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
-        req = info->mti_pill->rc_req;
-        mdt = mdt_dev(obd->obd_lu_dev);
-
-        rc = mdt_connect_check_sptlrpc(mdt, exp, req);
-        if (rc)
-                RETURN(rc);
-
         rc = mdt_connect_internal(exp, mdt_dev(obd->obd_lu_dev), data);
         if (rc == 0)
                 mdt_export_stats_init(obd, exp, localdata);
@@ -5402,6 +4930,31 @@ static int mdt_obd_reconnect(const struct lu_env *env,
         RETURN(rc);
 }
 
+static int mdt_ctxt_add_dirty_flag(struct lu_env *env,
+                                  struct mdt_thread_info *info,
+                                  struct mdt_file_data *mfd)
+{
+       struct lu_context ses;
+       int rc;
+       ENTRY;
+
+       rc = lu_context_init(&ses, LCT_SERVER_SESSION);
+       if (rc)
+               RETURN(rc);
+
+       env->le_ses = &ses;
+       lu_context_enter(&ses);
+
+       mdt_ucred(info)->uc_valid = UCRED_OLD;
+       rc = mdt_add_dirty_flag(info, mfd->mfd_object, &info->mti_attr);
+
+       lu_context_exit(&ses);
+       lu_context_fini(&ses);
+       env->le_ses = NULL;
+
+       RETURN(rc);
+}
+
 static int mdt_export_cleanup(struct obd_export *exp)
 {
         struct mdt_export_data *med = &exp->exp_mdt_data;
@@ -5446,6 +4999,24 @@ static int mdt_export_cleanup(struct obd_export *exp)
                 cfs_list_for_each_entry_safe(mfd, n, &closing_list, mfd_list) {
                         cfs_list_del_init(&mfd->mfd_list);
                        ma->ma_need = ma->ma_valid = 0;
+
+                       /* This file is being closed due to an eviction, it
+                        * could have been modified and now dirty regarding to
+                        * HSM archive, check this!
+                        * The logic here is to mark a file dirty if there's a
+                        * chance it was dirtied before the client was evicted,
+                        * so that we don't have to wait for a release attempt
+                        * before finding out the file was actually dirty and
+                        * fail the release. Aggressively marking it dirty here
+                        * will cause the policy engine to attempt to
+                        * re-archive it; when rearchiving, we can compare the
+                        * current version to the HSM data_version and make the
+                        * archive request into a noop if it's not actually
+                        * dirty.
+                        */
+                       if (mfd->mfd_mode & (FMODE_WRITE|MDS_FMODE_TRUNC))
+                               rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
+
                        /* Don't unlink orphan on failover umount, LU-184 */
                        if (exp->exp_flags & OBD_OPT_FAILOVER) {
                                ma->ma_valid = MA_FLAGS;
@@ -5589,9 +5160,7 @@ static int mdt_links_read(struct mdt_thread_info *info,
        if (rc < 0)
                return rc;
 
-       linkea_init(ldata);
-
-       return 0;
+       return linkea_init(ldata);
 }
 
 static int mdt_path_current(struct mdt_thread_info *info,
@@ -5643,15 +5212,15 @@ static int mdt_path_current(struct mdt_thread_info *info,
                rc = mdt_links_read(info, mdt_obj, &ldata);
                mdt_object_put(info->mti_env, mdt_obj);
                if (rc != 0)
-                       GOTO(out, rc = PTR_ERR(buf));
+                       GOTO(out, rc);
 
                leh = buf->lb_buf;
                lee = (struct link_ea_entry *)(leh + 1); /* link #0 */
                linkea_entry_unpack(lee, &reclen, tmpname, tmpfid);
                /* If set, use link #linkno for path lookup, otherwise use
                   link #0.  Only do this for the final path element. */
-               if ((pli->pli_fidcount == 0) &&
-                   (pli->pli_linkno < leh->leh_reccount)) {
+               if (pli->pli_fidcount == 0 &&
+                   pli->pli_linkno < leh->leh_reccount) {
                        int count;
                        for (count = 0; count < pli->pli_linkno; count++) {
                                lee = (struct link_ea_entry *)
@@ -5805,71 +5374,75 @@ static int mdt_rpc_fid2path(struct mdt_thread_info *info, void *key,
        RETURN(rc);
 }
 
-int mdt_get_info(struct mdt_thread_info *info)
+int mdt_get_info(struct tgt_session_info *tsi)
 {
-        struct ptlrpc_request *req = mdt_info_req(info);
-        char *key;
-        int keylen;
-        __u32 *vallen;
-        void *valout;
-        int rc;
-        ENTRY;
+       char    *key;
+       int      keylen;
+       __u32   *vallen;
+       void    *valout;
+       int      rc;
 
-        key = req_capsule_client_get(info->mti_pill, &RMF_GETINFO_KEY);
-        if (key == NULL) {
-                CDEBUG(D_IOCTL, "No GETINFO key");
-                RETURN(-EFAULT);
-        }
-        keylen = req_capsule_get_size(info->mti_pill, &RMF_GETINFO_KEY,
-                                      RCL_CLIENT);
+       ENTRY;
 
-        vallen = req_capsule_client_get(info->mti_pill, &RMF_GETINFO_VALLEN);
-        if (vallen == NULL) {
-                CDEBUG(D_IOCTL, "Unable to get RMF_GETINFO_VALLEN buffer");
-                RETURN(-EFAULT);
-        }
+       key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
+       if (key == NULL) {
+               CDEBUG(D_IOCTL, "No GETINFO key");
+               RETURN(err_serious(-EFAULT));
+       }
+       keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
+                                     RCL_CLIENT);
 
-        req_capsule_set_size(info->mti_pill, &RMF_GETINFO_VAL, RCL_SERVER,
-                             *vallen);
-        rc = req_capsule_server_pack(info->mti_pill);
-        valout = req_capsule_server_get(info->mti_pill, &RMF_GETINFO_VAL);
-        if (valout == NULL) {
-                CDEBUG(D_IOCTL, "Unable to get get-info RPC out buffer");
-                RETURN(-EFAULT);
-        }
+       vallen = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_VALLEN);
+       if (vallen == NULL) {
+               CDEBUG(D_IOCTL, "Unable to get RMF_GETINFO_VALLEN buffer");
+               RETURN(err_serious(-EFAULT));
+       }
 
-        if (KEY_IS(KEY_FID2PATH))
-                rc = mdt_rpc_fid2path(info, key, valout, *vallen);
-        else
-                rc = -EINVAL;
+       req_capsule_set_size(tsi->tsi_pill, &RMF_GETINFO_VAL, RCL_SERVER,
+                            *vallen);
+       rc = req_capsule_server_pack(tsi->tsi_pill);
+       if (rc)
+               RETURN(err_serious(rc));
 
-        lustre_msg_set_status(req->rq_repmsg, rc);
+       valout = req_capsule_server_get(tsi->tsi_pill, &RMF_GETINFO_VAL);
+       if (valout == NULL) {
+               CDEBUG(D_IOCTL, "Unable to get get-info RPC out buffer");
+               RETURN(err_serious(-EFAULT));
+       }
 
-        RETURN(rc);
+       if (KEY_IS(KEY_FID2PATH)) {
+               struct mdt_thread_info  *info = tsi2mdt_info(tsi);
+
+               rc = mdt_rpc_fid2path(info, key, valout, *vallen);
+               mdt_thread_info_fini(info);
+       } else {
+               rc = -EINVAL;
+       }
+       RETURN(rc);
 }
 
 /* Pass the ioc down */
 static int mdt_ioc_child(struct lu_env *env, struct mdt_device *mdt,
-                         unsigned int cmd, int len, void *data)
+                        unsigned int cmd, int len, void *data)
 {
-        struct lu_context ioctl_session;
-        struct md_device *next = mdt->mdt_child;
-        int rc;
-        ENTRY;
+       struct lu_context ioctl_session;
+       struct md_device *next = mdt->mdt_child;
+       int rc;
+       ENTRY;
 
-        rc = lu_context_init(&ioctl_session, LCT_SESSION);
-        if (rc)
-                RETURN(rc);
-        ioctl_session.lc_thread = (struct ptlrpc_thread *)cfs_current();
-        lu_context_enter(&ioctl_session);
-        env->le_ses = &ioctl_session;
+        rc = lu_context_init(&ioctl_session, LCT_SERVER_SESSION);
+       if (rc)
+               RETURN(rc);
+       ioctl_session.lc_thread = (struct ptlrpc_thread *)current;
+       lu_context_enter(&ioctl_session);
+       env->le_ses = &ioctl_session;
 
-        LASSERT(next->md_ops->mdo_iocontrol);
-        rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
+       LASSERT(next->md_ops->mdo_iocontrol);
+       rc = next->md_ops->mdo_iocontrol(env, next, cmd, len, data);
 
-        lu_context_exit(&ioctl_session);
-        lu_context_fini(&ioctl_session);
-        RETURN(rc);
+       lu_context_exit(&ioctl_session);
+       lu_context_fini(&ioctl_session);
+       RETURN(rc);
 }
 
 static int mdt_ioc_version_get(struct mdt_thread_info *mti, void *karg)
@@ -5984,6 +5557,9 @@ static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
                 rc = mdt_ioc_version_get(mti, karg);
                 break;
         }
+       case OBD_IOC_CATLOGLIST:
+               rc = llog_catalog_list(&env, mdt->mdt_bottom, 0, karg);
+               break;
        default:
                rc = -EOPNOTSUPP;
                CERROR("%s: Not supported cmd = %d, rc = %d\n",
@@ -6042,12 +5618,13 @@ static struct lu_device* mdt_device_fini(const struct lu_env *env,
 static struct lu_device *mdt_device_free(const struct lu_env *env,
                                          struct lu_device *d)
 {
-        struct mdt_device *m = mdt_dev(d);
-        ENTRY;
+       struct mdt_device *m = mdt_dev(d);
+       ENTRY;
 
-        md_device_fini(&m->mdt_md_dev);
-        OBD_FREE_PTR(m);
-        RETURN(NULL);
+       lu_device_fini(&m->mdt_lu_dev);
+       OBD_FREE_PTR(m);
+
+       RETURN(NULL);
 }
 
 static struct lu_device *mdt_device_alloc(const struct lu_env *env,
@@ -6061,7 +5638,7 @@ static struct lu_device *mdt_device_alloc(const struct lu_env *env,
         if (m != NULL) {
                 int rc;
 
-                l = &m->mdt_md_dev.md_lu_dev;
+               l = &m->mdt_lu_dev;
                 rc = mdt_init0(env, m, t, cfg);
                 if (rc != 0) {
                         mdt_device_free(env, l);
@@ -6169,9 +5746,11 @@ static int __init mdt_mod_init(void)
                GOTO(lu_fini, rc);
 
        lprocfs_mdt_init_vars(&lvars);
-       rc = class_register_type(&mdt_obd_device_ops, NULL,
-                                lvars.module_vars, LUSTRE_MDT_NAME,
-                                &mdt_device_type);
+       rc = class_register_type(&mdt_obd_device_ops, NULL, NULL,
+#ifndef HAVE_ONLY_PROCFS_SEQ
+                               lvars.module_vars,
+#endif
+                               LUSTRE_MDT_NAME, &mdt_device_type);
        if (rc)
                GOTO(mds_fini, rc);
 lu_fini: