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LU-12037 mdt: add option for cross-MDT rename
[fs/lustre-release.git] / lustre / mdt / mdt_handler.c
index 7b0c612..2ce7a68 100644 (file)
@@ -66,7 +66,6 @@
 
 #include "mdt_internal.h"
 
-
 static unsigned int max_mod_rpcs_per_client = 8;
 module_param(max_mod_rpcs_per_client, uint, 0644);
 MODULE_PARM_DESC(max_mod_rpcs_per_client, "maximum number of modify RPCs in flight allowed per client");
@@ -94,7 +93,6 @@ enum ldlm_mode mdt_dlm_lock_modes[] = {
 };
 
 static struct mdt_device *mdt_dev(struct lu_device *d);
-static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
 
 static const struct lu_object_operations mdt_obj_ops;
 
@@ -270,18 +268,13 @@ static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
 {
        struct mdt_device *mdt = info->mti_mdt;
        struct lu_name *lname = &info->mti_name;
-       char *name = NULL;
+       char *filename = info->mti_filename;
        struct mdt_object *parent;
        u32 mode;
        int rc = 0;
 
        LASSERT(!info->mti_cross_ref);
 
-       OBD_ALLOC(name, NAME_MAX + 1);
-       if (name == NULL)
-               return -ENOMEM;
-       lname->ln_name = name;
-
        /*
         * We may want to allow this to mount a completely separate
         * fileset from the MDT in the future, but keeping it to
@@ -317,8 +310,9 @@ static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
                        break;
                }
 
-               strncpy(name, s1, lname->ln_namelen);
-               name[lname->ln_namelen] = '\0';
+               strncpy(filename, s1, lname->ln_namelen);
+               filename[lname->ln_namelen] = '\0';
+               lname->ln_name = filename;
 
                parent = mdt_object_find(info->mti_env, mdt, fid);
                if (IS_ERR(parent)) {
@@ -343,8 +337,6 @@ static int mdt_lookup_fileset(struct mdt_thread_info *info, const char *fileset,
                }
        }
 
-       OBD_FREE(name, NAME_MAX + 1);
-
        return rc;
 }
 
@@ -413,13 +405,16 @@ out:
 
 static int mdt_statfs(struct tgt_session_info *tsi)
 {
-       struct ptlrpc_request           *req = tgt_ses_req(tsi);
-       struct mdt_thread_info          *info = tsi2mdt_info(tsi);
-       struct mdt_device               *mdt = info->mti_mdt;
-       struct tg_grants_data           *tgd = &mdt->mdt_lut.lut_tgd;
-       struct ptlrpc_service_part      *svcpt;
-       struct obd_statfs               *osfs;
-       int                             rc;
+       struct ptlrpc_request *req = tgt_ses_req(tsi);
+       struct mdt_thread_info *info = tsi2mdt_info(tsi);
+       struct mdt_device *mdt = info->mti_mdt;
+       struct tg_grants_data *tgd = &mdt->mdt_lut.lut_tgd;
+       struct md_device *next = mdt->mdt_child;
+       struct ptlrpc_service_part *svcpt;
+       struct obd_statfs *osfs;
+       struct mdt_body *reqbody = NULL;
+       struct mdt_statfs_cache *msf;
+       int rc;
 
        ENTRY;
 
@@ -441,11 +436,39 @@ static int mdt_statfs(struct tgt_session_info *tsi)
        if (!osfs)
                GOTO(out, rc = -EPROTO);
 
-       rc = tgt_statfs_internal(tsi->tsi_env, &mdt->mdt_lut, osfs,
-                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
-                                NULL);
-       if (unlikely(rc))
-               GOTO(out, rc);
+       if (mdt_is_sum_statfs_client(req->rq_export) &&
+               lustre_packed_msg_size(req->rq_reqmsg) ==
+               req_capsule_fmt_size(req->rq_reqmsg->lm_magic,
+                                    &RQF_MDS_STATFS_NEW, RCL_CLIENT)) {
+               req_capsule_extend(info->mti_pill, &RQF_MDS_STATFS_NEW);
+               reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
+       }
+
+       if (reqbody && reqbody->mbo_valid & OBD_MD_FLAGSTATFS)
+               msf = &mdt->mdt_sum_osfs;
+       else
+               msf = &mdt->mdt_osfs;
+
+       if (msf->msf_age + OBD_STATFS_CACHE_SECONDS <= ktime_get_seconds()) {
+                       /** statfs data is too old, get up-to-date one */
+                       if (reqbody && reqbody->mbo_valid & OBD_MD_FLAGSTATFS)
+                               rc = next->md_ops->mdo_statfs(info->mti_env,
+                                                             next, osfs);
+                       else
+                               rc = dt_statfs(info->mti_env, mdt->mdt_bottom,
+                                              osfs);
+                       if (rc)
+                               GOTO(out, rc);
+                       spin_lock(&mdt->mdt_lock);
+                       msf->msf_osfs = *osfs;
+                       msf->msf_age = ktime_get_seconds();
+                       spin_unlock(&mdt->mdt_lock);
+       } else {
+                       /** use cached statfs data */
+                       spin_lock(&mdt->mdt_lock);
+                       *osfs = msf->msf_osfs;
+                       spin_unlock(&mdt->mdt_lock);
+       }
 
        /* at least try to account for cached pages.  its still racy and
         * might be under-reporting if clients haven't announced their
@@ -490,11 +513,12 @@ out:
  * Pack size attributes into the reply.
  */
 int mdt_pack_size2body(struct mdt_thread_info *info,
-                       const struct lu_fid *fid, bool dom_lock)
+                       const struct lu_fid *fid, struct lustre_handle *lh)
 {
        struct mdt_body *b;
        struct md_attr *ma = &info->mti_attr;
        int dom_stripe;
+       bool dom_lock = false;
 
        ENTRY;
 
@@ -509,6 +533,16 @@ int mdt_pack_size2body(struct mdt_thread_info *info,
        if (dom_stripe == LMM_NO_DOM)
                RETURN(-ENOENT);
 
+       if (lustre_handle_is_used(lh)) {
+               struct ldlm_lock *lock;
+
+               lock = ldlm_handle2lock(lh);
+               if (lock != NULL) {
+                       dom_lock = ldlm_has_dom(lock);
+                       LDLM_LOCK_PUT(lock);
+               }
+       }
+
        /* no DoM lock, no size in reply */
        if (!dom_lock)
                RETURN(0);
@@ -539,13 +573,13 @@ int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
        struct md_object        *next = mdt_object_child(o);
        struct lu_buf           *buf = &info->mti_buf;
        struct mdt_device       *mdt = info->mti_mdt;
+       struct req_capsule *pill = info->mti_pill;
        int rc;
 
        ENTRY;
 
-       buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
-       buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
-                                          RCL_SERVER);
+       buf->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
+       buf->lb_len = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
        if (buf->lb_len == 0)
                RETURN(0);
 
@@ -563,25 +597,26 @@ again:
                            exp_connect_large_acl(info->mti_exp) &&
                            buf->lb_buf != info->mti_big_acl) {
                                if (info->mti_big_acl == NULL) {
+                                       info->mti_big_aclsize =
+                                                       MIN(mdt->mdt_max_ea_size,
+                                                           XATTR_SIZE_MAX);
                                        OBD_ALLOC_LARGE(info->mti_big_acl,
-                                                       mdt->mdt_max_ea_size);
+                                                       info->mti_big_aclsize);
                                        if (info->mti_big_acl == NULL) {
+                                               info->mti_big_aclsize = 0;
                                                CERROR("%s: unable to grow "
                                                       DFID" ACL buffer\n",
                                                       mdt_obd_name(mdt),
                                                       PFID(mdt_object_fid(o)));
                                                RETURN(-ENOMEM);
                                        }
-
-                                       info->mti_big_aclsize =
-                                                       mdt->mdt_max_ea_size;
                                }
 
                                CDEBUG(D_INODE, "%s: grow the "DFID
                                       " ACL buffer to size %d\n",
                                       mdt_obd_name(mdt),
                                       PFID(mdt_object_fid(o)),
-                                      mdt->mdt_max_ea_size);
+                                      info->mti_big_aclsize);
 
                                buf->lb_buf = info->mti_big_acl;
                                buf->lb_len = info->mti_big_aclsize;
@@ -593,6 +628,36 @@ again:
                               mdt_obd_name(mdt), PFID(mdt_object_fid(o)), rc);
                }
        } else {
+               int client;
+               int server;
+               int acl_buflen;
+               int lmm_buflen = 0;
+               int lmmsize = 0;
+
+               acl_buflen = req_capsule_get_size(pill, &RMF_ACL, RCL_SERVER);
+               if (acl_buflen >= rc)
+                       goto map;
+
+               /* If LOV/LMA EA is small, we can reuse part of their buffer */
+               client = ptlrpc_req_get_repsize(pill->rc_req);
+               server = lustre_packed_msg_size(pill->rc_req->rq_repmsg);
+               if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER)) {
+                       lmm_buflen = req_capsule_get_size(pill, &RMF_MDT_MD,
+                                                         RCL_SERVER);
+                       lmmsize = repbody->mbo_eadatasize;
+               }
+
+               if (client < server - acl_buflen - lmm_buflen + rc + lmmsize) {
+                       CDEBUG(D_INODE, "%s: client prepared buffer size %d "
+                              "is not big enough with the ACL size %d (%d)\n",
+                              mdt_obd_name(mdt), client, rc,
+                              server - acl_buflen - lmm_buflen + rc + lmmsize);
+                       repbody->mbo_aclsize = 0;
+                       repbody->mbo_valid &= ~OBD_MD_FLACL;
+                       RETURN(-ERANGE);
+               }
+
+map:
                if (buf->lb_buf == info->mti_big_acl)
                        info->mti_big_acl_used = 1;
 
@@ -603,6 +668,8 @@ again:
                        CERROR("%s: nodemap_map_acl unable to parse "DFID
                               " ACL: rc = %d\n", mdt_obd_name(mdt),
                               PFID(mdt_object_fid(o)), rc);
+                       repbody->mbo_aclsize = 0;
+                       repbody->mbo_valid &= ~OBD_MD_FLACL;
                } else {
                        repbody->mbo_aclsize = rc;
                        repbody->mbo_valid |= OBD_MD_FLACL;
@@ -873,6 +940,8 @@ int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
                return -EINVAL;
        }
 
+       LASSERT(buf->lb_buf);
+
        rc = mo_xattr_get(info->mti_env, next, buf, name);
        if (rc > 0) {
 
@@ -925,8 +994,8 @@ got:
        return rc;
 }
 
-static int mdt_attr_get_pfid(struct mdt_thread_info *info,
-                            struct mdt_object *o, struct lu_fid *pfid)
+int mdt_attr_get_pfid(struct mdt_thread_info *info, struct mdt_object *o,
+                     struct lu_fid *pfid)
 {
        struct lu_buf           *buf = &info->mti_buf;
        struct link_ea_header   *leh;
@@ -996,7 +1065,7 @@ int mdt_attr_get_complex(struct mdt_thread_info *info,
                        GOTO(out, rc);
 
                if (S_ISREG(mode))
-                       (void) mdt_get_som(info, o, &ma->ma_attr);
+                       (void) mdt_get_som(info, o, ma);
                ma->ma_valid |= MA_INODE;
        }
 
@@ -1026,6 +1095,15 @@ int mdt_attr_get_complex(struct mdt_thread_info *info,
                        GOTO(out, rc);
        }
 
+       /*
+        * In the handle of MA_INODE, we may already get the SOM attr.
+        */
+       if (need & MA_SOM && S_ISREG(mode) && !(ma->ma_valid & MA_SOM)) {
+               rc = mdt_get_som(info, o, ma);
+               if (rc != 0)
+                       GOTO(out, rc);
+       }
+
        if (need & MA_HSM && S_ISREG(mode)) {
                buf->lb_buf = info->mti_xattr_buf;
                buf->lb_len = sizeof(info->mti_xattr_buf);
@@ -1272,6 +1350,12 @@ static int mdt_getattr(struct tgt_session_info *tsi)
         LASSERT(obj != NULL);
        LASSERT(lu_object_assert_exists(&obj->mot_obj));
 
+       /* Special case for Data-on-MDT files to get data version */
+       if (unlikely(reqbody->mbo_valid & OBD_MD_FLDATAVERSION)) {
+               rc = mdt_data_version_get(tsi);
+               GOTO(out, rc);
+       }
+
        /* Unlike intent case where we need to pre-fill out buffers early on
         * in intent policy for ldlm reasons, here we can have a much better
         * guess at EA size by just reading it from disk.
@@ -1281,7 +1365,6 @@ static int mdt_getattr(struct tgt_session_info *tsi)
                /* No easy way to know how long is the symlink, but it cannot
                 * be more than PATH_MAX, so we allocate +1 */
                rc = PATH_MAX + 1;
-
        /* A special case for fs ROOT: getattr there might fetch
         * default EA for entire fs, not just for this dir!
         */
@@ -1325,12 +1408,12 @@ static int mdt_getattr(struct tgt_session_info *tsi)
        info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
 
        rc = mdt_getattr_internal(info, obj, 0);
-        EXIT;
+       EXIT;
 out_shrink:
-        mdt_client_compatibility(info);
-        rc2 = mdt_fix_reply(info);
-        if (rc == 0)
-                rc = rc2;
+       mdt_client_compatibility(info);
+       rc2 = mdt_fix_reply(info);
+       if (rc == 0)
+               rc = rc2;
 out:
        mdt_thread_info_fini(info);
        return rc;
@@ -1370,8 +1453,9 @@ int mdt_layout_change(struct mdt_thread_info *info, struct mdt_object *obj,
        if (rc)
                GOTO(out, rc);
 
+       mutex_lock(&obj->mot_som_mutex);
        rc = mo_layout_change(info->mti_env, mdt_object_child(obj), layout);
-
+       mutex_unlock(&obj->mot_som_mutex);
        mdt_object_unlock(info, obj, lh, 1);
 out:
        RETURN(rc);
@@ -1444,12 +1528,12 @@ static int mdt_swap_layouts(struct tgt_session_info *tsi)
        /* permission check. Make sure the calling process having permission
         * to write both files. */
        rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
-                               MAY_WRITE);
+                          MAY_WRITE);
        if (rc < 0)
                GOTO(put, rc);
 
        rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
-                               MAY_WRITE);
+                          MAY_WRITE);
        if (rc < 0)
                GOTO(put, rc);
 
@@ -1538,9 +1622,11 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
        struct lu_name         *lname = NULL;
        struct mdt_lock_handle *lhp = NULL;
        struct ldlm_lock       *lock;
+       struct req_capsule *pill = info->mti_pill;
        __u64 try_bits = 0;
        bool is_resent;
        int ma_need = 0;
+       bool deal_with_dom = false;
        int rc;
 
        ENTRY;
@@ -1569,12 +1655,15 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                        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.
+                        * Object's name entry is on another MDS, it will
+                        * request PERM lock only because LOOKUP lock is owned
+                        * by the MDS where name entry resides.
+                        *
+                        * TODO: it should try layout lock too. - Jinshan
                         */
                        child_bits &= ~(MDS_INODELOCK_LOOKUP |
                                        MDS_INODELOCK_LAYOUT);
-                       child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
+                       child_bits |= MDS_INODELOCK_PERM;
 
                        rc = mdt_object_lock(info, child, lhc, child_bits);
                        if (rc < 0)
@@ -1594,18 +1683,20 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                if (unlikely(rc != 0))
                        mdt_object_unlock(info, child, lhc, 1);
 
-                RETURN(rc);
-        }
+               mdt_pack_secctx_in_reply(info, child);
+
+               RETURN(rc);
+       }
 
        lname = &info->mti_name;
-       mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
+       mdt_name_unpack(pill, &RMF_NAME, lname, MNF_FIX_ANON);
 
        if (lu_name_is_valid(lname)) {
                CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
                       "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
                       PNAME(lname), ldlm_rep);
        } else {
-               reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
+               reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
                if (unlikely(reqbody == NULL))
                        RETURN(err_serious(-EPROTO));
 
@@ -1758,16 +1849,17 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                                child_bits &= ~MDS_INODELOCK_UPDATE;
                        rc = mdt_object_lock(info, child, lhc, child_bits);
                }
-                if (unlikely(rc != 0))
-                        GOTO(out_child, rc);
-        }
+               if (unlikely(rc != 0))
+                       GOTO(out_child, rc);
+       }
 
-        lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
+       lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
 
-        /* finally, we can get attr for child. */
-        rc = mdt_getattr_internal(info, child, ma_need);
-        if (unlikely(rc != 0)) {
-                mdt_object_unlock(info, child, lhc, 1);
+       /* finally, we can get attr for child. */
+       rc = mdt_getattr_internal(info, child, ma_need);
+       if (unlikely(rc != 0)) {
+               mdt_object_unlock(info, child, lhc, 1);
+               GOTO(out_lock, rc);
        } else if (lock) {
                /* Debugging code. */
                LDLM_DEBUG(lock, "Returning lock to client");
@@ -1779,35 +1871,36 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
 
                if (S_ISREG(lu_object_attr(&child->mot_obj)) &&
                    mdt_object_exists(child) && !mdt_object_remote(child) &&
-                   child != parent) {
-                       LDLM_LOCK_PUT(lock);
-                       mdt_object_put(info->mti_env, child);
-                       /* NB: call the mdt_pack_size2body always after
-                        * mdt_object_put(), that is why this speacial
-                        * exit path is used. */
-                       rc = mdt_pack_size2body(info, child_fid,
-                                               child_bits & MDS_INODELOCK_DOM);
-                       if (rc != 0 && child_bits & MDS_INODELOCK_DOM) {
-                               /* DOM lock was taken in advance but this is
-                                * not DoM file. Drop the lock. */
-                               lock_res_and_lock(lock);
-                               ldlm_inodebits_drop(lock, MDS_INODELOCK_DOM);
-                               unlock_res_and_lock(lock);
-                       }
+                   child != parent)
+                       deal_with_dom = true;
+       }
 
-                       GOTO(out_parent, rc = 0);
-               }
-        }
-        if (lock)
-                LDLM_LOCK_PUT(lock);
+       mdt_pack_secctx_in_reply(info, child);
 
-        EXIT;
+out_lock:
+       if (lock)
+               LDLM_LOCK_PUT(lock);
+
+       EXIT;
 out_child:
-        mdt_object_put(info->mti_env, child);
+       mdt_object_put(info->mti_env, child);
+       if (deal_with_dom) {
+               rc = mdt_pack_size2body(info, child_fid,
+                                       &lhc->mlh_reg_lh);
+               if (rc != 0 && child_bits & MDS_INODELOCK_DOM) {
+                       /* DOM lock was taken in advance but this is
+                        * not DoM file. Drop the lock.
+                        */
+                       lock_res_and_lock(lock);
+                       ldlm_inodebits_drop(lock, MDS_INODELOCK_DOM);
+                       unlock_res_and_lock(lock);
+               }
+               rc = 0;
+       }
 out_parent:
-        if (lhp)
-                mdt_object_unlock(info, parent, lhp, 1);
-        return rc;
+       if (lhp)
+               mdt_object_unlock(info, parent, lhp, 1);
+       return rc;
 }
 
 /* normal handler: should release the child lock */
@@ -2003,6 +2096,34 @@ static int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
        return 0;
 }
 
+static inline bool mdt_is_readonly_open(struct mdt_thread_info *info, __u32 op)
+{
+       return op == REINT_OPEN &&
+            !(info->mti_spec.sp_cr_flags & (MDS_FMODE_WRITE | MDS_OPEN_CREAT));
+}
+
+static void mdt_preset_secctx_size(struct mdt_thread_info *info)
+{
+       struct req_capsule *pill = info->mti_pill;
+
+       if (req_capsule_has_field(pill, &RMF_FILE_SECCTX,
+                                 RCL_SERVER) &&
+           req_capsule_has_field(pill, &RMF_FILE_SECCTX_NAME,
+                                 RCL_CLIENT)) {
+               if (req_capsule_get_size(pill, &RMF_FILE_SECCTX_NAME,
+                                        RCL_CLIENT) != 0) {
+                       /* pre-set size in server part with max size */
+                       req_capsule_set_size(pill, &RMF_FILE_SECCTX,
+                                            RCL_SERVER,
+                                            info->mti_mdt->mdt_max_ea_size);
+               } else {
+                       req_capsule_set_size(pill, &RMF_FILE_SECCTX,
+                                            RCL_SERVER, 0);
+               }
+       }
+
+}
+
 static int mdt_reint_internal(struct mdt_thread_info *info,
                               struct mdt_lock_handle *lhc,
                               __u32 op)
@@ -2013,19 +2134,25 @@ static int mdt_reint_internal(struct mdt_thread_info *info,
 
        ENTRY;
 
-        rc = mdt_reint_unpack(info, op);
-        if (rc != 0) {
-                CERROR("Can't unpack reint, rc %d\n", rc);
-                RETURN(err_serious(rc));
-        }
+       rc = mdt_reint_unpack(info, op);
+       if (rc != 0) {
+               CERROR("Can't unpack reint, rc %d\n", rc);
+               RETURN(err_serious(rc));
+       }
+
 
-        /* for replay (no_create) lmm is not needed, client has it already */
-        if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
-                req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
+       /* check if the file system is set to readonly. O_RDONLY open
+        * is still allowed even the file system is set to readonly mode */
+       if (mdt_rdonly(info->mti_exp) && !mdt_is_readonly_open(info, op))
+               RETURN(err_serious(-EROFS));
+
+       /* for replay (no_create) lmm is not needed, client has it already */
+       if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
+               req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
                                     DEF_REP_MD_SIZE);
 
        /* llog cookies are always 0, the field is kept for compatibility */
-        if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
+       if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
                req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
 
        /* Set ACL reply buffer size as LUSTRE_POSIX_ACL_MAX_SIZE_OLD
@@ -2035,33 +2162,35 @@ static int mdt_reint_internal(struct mdt_thread_info *info,
                req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
                                     LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
 
-        rc = req_capsule_server_pack(pill);
-        if (rc != 0) {
-                CERROR("Can't pack response, rc %d\n", rc);
-                RETURN(err_serious(rc));
-        }
+       mdt_preset_secctx_size(info);
+
+       rc = req_capsule_server_pack(pill);
+       if (rc != 0) {
+               CERROR("Can't pack response, rc %d\n", rc);
+               RETURN(err_serious(rc));
+       }
 
-        if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
-                repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
-                LASSERT(repbody);
+       if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
+               repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
+               LASSERT(repbody);
                repbody->mbo_eadatasize = 0;
                repbody->mbo_aclsize = 0;
-        }
+       }
 
-        OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
+       OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
 
-        /* for replay no cookkie / lmm need, because client have this already */
-        if (info->mti_spec.no_create)
-                if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
-                        req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
+       /* for replay no cookkie / lmm need, because client have this already */
+       if (info->mti_spec.no_create)
+               if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
+                       req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
 
-        rc = mdt_init_ucred_reint(info);
-        if (rc)
-                GOTO(out_shrink, rc);
+       rc = mdt_init_ucred_reint(info);
+       if (rc)
+               GOTO(out_shrink, rc);
 
-        rc = mdt_fix_attr_ucred(info, op);
-        if (rc != 0)
-                GOTO(out_ucred, rc = err_serious(rc));
+       rc = mdt_fix_attr_ucred(info, op);
+       if (rc != 0)
+               GOTO(out_ucred, rc = err_serious(rc));
 
        rc = mdt_check_resent(info, mdt_reconstruct, lhc);
        if (rc < 0) {
@@ -2069,18 +2198,31 @@ static int mdt_reint_internal(struct mdt_thread_info *info,
        } else if (rc == 1) {
                DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
                rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
-                GOTO(out_ucred, rc);
-        }
-        rc = mdt_reint_rec(info, lhc);
-        EXIT;
+               GOTO(out_ucred, rc);
+       }
+       rc = mdt_reint_rec(info, lhc);
+       EXIT;
 out_ucred:
-        mdt_exit_ucred(info);
+       mdt_exit_ucred(info);
 out_shrink:
-        mdt_client_compatibility(info);
-        rc2 = mdt_fix_reply(info);
-        if (rc == 0)
-                rc = rc2;
-        return rc;
+       mdt_client_compatibility(info);
+
+       rc2 = mdt_fix_reply(info);
+       if (rc == 0)
+               rc = rc2;
+
+       /*
+        * Data-on-MDT optimization - read data along with OPEN and return it
+        * in reply. Do that only if we have both DOM and LAYOUT locks.
+        */
+       if (rc == 0 && op == REINT_OPEN && !req_is_replay(pill->rc_req) &&
+           info->mti_attr.ma_lmm != NULL &&
+           mdt_lmm_dom_entry(info->mti_attr.ma_lmm) == LMM_DOM_ONLY) {
+               rc = mdt_dom_read_on_open(info, info->mti_mdt,
+                                         &lhc->mlh_reg_lh);
+       }
+
+       return rc;
 }
 
 static long mdt_reint_opcode(struct ptlrpc_request *req,
@@ -2122,7 +2264,7 @@ static int mdt_reint(struct tgt_session_info *tsi)
                [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
                [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
                [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
-               [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME,
+               [REINT_MIGRATE]  = &RQF_MDS_REINT_MIGRATE,
                [REINT_RESYNC]   = &RQF_MDS_REINT_RESYNC,
        };
 
@@ -2146,7 +2288,7 @@ static int mdt_reint(struct tgt_session_info *tsi)
 }
 
 /* this should sync the whole device */
-static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
+int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
 {
         struct dt_device *dt = mdt->mdt_bottom;
         int rc;
@@ -2298,10 +2440,12 @@ static int mdt_quotactl(struct tgt_session_info *tsi)
                /* master quotactl */
        case Q_SETINFO:
        case Q_SETQUOTA:
+       case LUSTRE_Q_SETDEFAULT:
                if (!nodemap_can_setquota(nodemap))
                        GOTO(out_nodemap, rc = -EPERM);
        case Q_GETINFO:
        case Q_GETQUOTA:
+       case LUSTRE_Q_GETDEFAULT:
                if (qmt == NULL)
                        GOTO(out_nodemap, rc = -EOPNOTSUPP);
                /* slave quotactl */
@@ -2351,6 +2495,8 @@ static int mdt_quotactl(struct tgt_session_info *tsi)
        case Q_SETINFO:
        case Q_SETQUOTA:
        case Q_GETQUOTA:
+       case LUSTRE_Q_SETDEFAULT:
+       case LUSTRE_Q_GETDEFAULT:
                /* forward quotactl request to QMT */
                rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
                break;
@@ -2558,6 +2704,7 @@ int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 {
        struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
        struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+       struct ldlm_cb_set_arg *arg = data;
        bool commit_async = false;
        int rc;
        ENTRY;
@@ -2570,17 +2717,22 @@ int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
                unlock_res_and_lock(lock);
                RETURN(0);
        }
-       /* There is no lock conflict if l_blocking_lock == NULL,
-        * it indicates a blocking ast sent from ldlm_lock_decref_internal
-        * when the last reference to a local lock was released */
-       if (lock->l_req_mode & (LCK_PW | LCK_EX) &&
-           lock->l_blocking_lock != NULL) {
+
+       /* A blocking ast may be sent from ldlm_lock_decref_internal
+        * when the last reference to a local lock was released and
+        * during blocking event from ldlm_work_bl_ast_lock().
+        * The 'data' parameter is l_ast_data in the first case and
+        * callback arguments in the second one. Distinguish them by that.
+        */
+       if (!data || data == lock->l_ast_data || !arg->bl_desc)
+               goto skip_cos_checks;
+
+       if (lock->l_req_mode & (LCK_PW | LCK_EX)) {
                if (mdt_cos_is_enabled(mdt)) {
-                       if (lock->l_client_cookie !=
-                           lock->l_blocking_lock->l_client_cookie)
+                       if (!arg->bl_desc->bl_same_client)
                                mdt_set_lock_sync(lock);
                } else if (mdt_slc_is_enabled(mdt) &&
-                          ldlm_is_cos_incompat(lock->l_blocking_lock)) {
+                          arg->bl_desc->bl_cos_incompat) {
                        mdt_set_lock_sync(lock);
                        /*
                         * we may do extra commit here, but there is a small
@@ -2594,11 +2746,11 @@ int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
                         */
                        commit_async = true;
                }
-       } else if (lock->l_req_mode == LCK_COS &&
-                  lock->l_blocking_lock != NULL) {
+       } else if (lock->l_req_mode == LCK_COS) {
                commit_async = true;
        }
 
+skip_cos_checks:
        rc = ldlm_blocking_ast_nocheck(lock);
 
        if (commit_async) {
@@ -2724,12 +2876,17 @@ int mdt_check_resent_lock(struct mdt_thread_info *info,
        return 1;
 }
 
+static void mdt_remote_object_lock_created_cb(struct ldlm_lock *lock)
+{
+       mdt_object_get(NULL, lock->l_ast_data);
+}
+
 int mdt_remote_object_lock_try(struct mdt_thread_info *mti,
                               struct mdt_object *o, const struct lu_fid *fid,
                               struct lustre_handle *lh, enum ldlm_mode mode,
                               __u64 *ibits, __u64 trybits, bool cache)
 {
-       struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
+       struct ldlm_enqueue_info *einfo = &mti->mti_remote_einfo;
        union ldlm_policy_data *policy = &mti->mti_policy;
        struct ldlm_res_id *res_id = &mti->mti_res_id;
        int rc = 0;
@@ -2752,21 +2909,16 @@ int mdt_remote_object_lock_try(struct mdt_thread_info *mti,
                 * if we cache lock, couple lock with mdt_object, so that object
                 * can be easily found in lock ASTs.
                 */
-               mdt_object_get(mti->mti_env, o);
                einfo->ei_cbdata = o;
+               einfo->ei_cb_created = mdt_remote_object_lock_created_cb;
        }
 
-
        memset(policy, 0, sizeof(*policy));
        policy->l_inodebits.bits = *ibits;
        policy->l_inodebits.try_bits = trybits;
 
        rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
                            policy);
-       if (rc < 0 && cache) {
-               mdt_object_put(mti->mti_env, o);
-               einfo->ei_cbdata = NULL;
-       }
 
        /* Return successfully acquired bits to a caller */
        if (rc == 0) {
@@ -2795,7 +2947,7 @@ static int mdt_object_local_lock(struct mdt_thread_info *info,
        struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
        union ldlm_policy_data *policy = &info->mti_policy;
        struct ldlm_res_id *res_id = &info->mti_res_id;
-       __u64 dlmflags = 0;
+       __u64 dlmflags = 0, *cookie = NULL;
        int rc;
        ENTRY;
 
@@ -2815,6 +2967,11 @@ static int mdt_object_local_lock(struct mdt_thread_info *info,
        /* Only enqueue LOOKUP lock for remote object */
        LASSERT(ergo(mdt_object_remote(o), *ibits == MDS_INODELOCK_LOOKUP));
 
+       /* Lease lock are granted with LDLM_FL_CANCEL_ON_BLOCK */
+       if (lh->mlh_type == MDT_REG_LOCK && lh->mlh_reg_mode == LCK_EX &&
+           *ibits == MDS_INODELOCK_OPEN)
+               dlmflags |= LDLM_FL_CANCEL_ON_BLOCK;
+
        if (lh->mlh_type == MDT_PDO_LOCK) {
                 /* check for exists after object is locked */
                 if (mdt_object_exists(o) == 0) {
@@ -2827,10 +2984,12 @@ static int mdt_object_local_lock(struct mdt_thread_info *info,
                }
        }
 
-
        fid_build_reg_res_name(mdt_object_fid(o), res_id);
        dlmflags |= LDLM_FL_ATOMIC_CB;
 
+       if (info->mti_exp)
+               cookie = &info->mti_exp->exp_handle.h_cookie;
+
        /*
         * Take PDO lock on whole directory and build correct @res_id for lock
         * on part of directory.
@@ -2844,12 +3003,16 @@ static int mdt_object_local_lock(struct mdt_thread_info *info,
                         * is never going to be sent to client and we do not
                         * want it slowed down due to possible cancels.
                         */
-                       policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
-                       policy->l_inodebits.try_bits = 0;
-                       rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
-                                         policy, res_id, dlmflags,
-                                         info->mti_exp == NULL ? NULL :
-                                         &info->mti_exp->exp_handle.h_cookie);
+                       policy->l_inodebits.bits =
+                               *ibits & MDS_INODELOCK_UPDATE;
+                       policy->l_inodebits.try_bits =
+                               trybits & MDS_INODELOCK_UPDATE;
+                       /* at least one of them should be set */
+                       LASSERT(policy->l_inodebits.bits |
+                               policy->l_inodebits.try_bits);
+                       rc = mdt_fid_lock(info->mti_env, ns, &lh->mlh_pdo_lh,
+                                         lh->mlh_pdo_mode, policy, res_id,
+                                         dlmflags, cookie);
                        if (unlikely(rc != 0))
                                GOTO(out_unlock, rc);
                 }
@@ -2869,10 +3032,9 @@ static int mdt_object_local_lock(struct mdt_thread_info *info,
          * going to be sent to client. If it is - mdt_intent_policy() path will
          * fix it up and turn FL_LOCAL flag off.
          */
-       rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
-                         res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
-                         info->mti_exp == NULL ? NULL :
-                         &info->mti_exp->exp_handle.h_cookie);
+       rc = mdt_fid_lock(info->mti_env, ns, &lh->mlh_reg_lh, lh->mlh_reg_mode,
+                         policy, res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
+                         cookie);
 out_unlock:
        if (rc != 0)
                mdt_object_unlock(info, o, lh, 1);
@@ -2949,6 +3111,10 @@ mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
                }
        }
 
+       /* other components like LFSCK can use lockless access
+        * and populate cache, so we better invalidate it */
+       mo_invalidate(info->mti_env, mdt_object_child(o));
+
        RETURN(0);
 }
 
@@ -3155,11 +3321,12 @@ void mdt_object_unlock_put(struct mdt_thread_info * info,
  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
  *  @info;
  *
- *  - if HABEO_CORPUS flag is set for this request type check whether object
+ *  - if HAS_BODY flag is set for this request type check whether object
  *  actually exists on storage (lu_object_exists()).
  *
  */
-static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
+static int mdt_body_unpack(struct mdt_thread_info *info,
+                          enum tgt_handler_flags flags)
 {
         const struct mdt_body    *body;
         struct mdt_object        *obj;
@@ -3185,7 +3352,7 @@ static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
 
        obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
        if (!IS_ERR(obj)) {
-               if ((flags & HABEO_CORPUS) && !mdt_object_exists(obj)) {
+               if ((flags & HAS_BODY) && !mdt_object_exists(obj)) {
                        mdt_object_put(env, obj);
                        rc = -ENOENT;
                 } else {
@@ -3198,23 +3365,25 @@ static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
         RETURN(rc);
 }
 
-static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
+static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info,
+                                  enum tgt_handler_flags flags)
 {
-        struct req_capsule *pill = info->mti_pill;
-        int rc;
-        ENTRY;
+       struct req_capsule *pill = info->mti_pill;
+       int rc;
 
-        if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
-                rc = mdt_body_unpack(info, flags);
-        else
-                rc = 0;
+       ENTRY;
+
+       if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
+               rc = mdt_body_unpack(info, flags);
+       else
+               rc = 0;
 
-        if (rc == 0 && (flags & HABEO_REFERO)) {
-                /* Pack reply. */
-                if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
-                        req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
+       if (rc == 0 && (flags & HAS_REPLY)) {
+               /* Pack reply. */
+               if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
+                       req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
                                             DEF_REP_MD_SIZE);
-                if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
+               if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
                        req_capsule_set_size(pill, &RMF_LOGCOOKIES,
                                             RCL_SERVER, 0);
 
@@ -3225,9 +3394,14 @@ static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
                        req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
                                             LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
 
-                rc = req_capsule_server_pack(pill);
-        }
-        RETURN(rc);
+               mdt_preset_secctx_size(info);
+
+               rc = req_capsule_server_pack(pill);
+               if (rc)
+                       CWARN("%s: cannot pack response: rc = %d\n",
+                                     mdt_obd_name(info->mti_mdt), rc);
+       }
+       RETURN(rc);
 }
 
 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
@@ -3342,48 +3516,14 @@ static int mdt_tgt_connect(struct tgt_session_info *tsi)
        return tgt_connect(tsi);
 }
 
-enum mdt_it_code {
-        MDT_IT_OPEN,
-        MDT_IT_OCREAT,
-        MDT_IT_CREATE,
-        MDT_IT_GETATTR,
-        MDT_IT_READDIR,
-        MDT_IT_LOOKUP,
-        MDT_IT_UNLINK,
-        MDT_IT_TRUNC,
-        MDT_IT_GETXATTR,
-        MDT_IT_LAYOUT,
-       MDT_IT_QUOTA,
-       MDT_IT_GLIMPSE,
-       MDT_IT_BRW,
-       MDT_IT_NR
-};
-
-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 **,
-                            __u64);
-static int mdt_intent_reint(enum mdt_it_code opcode,
-                            struct mdt_thread_info *info,
-                            struct ldlm_lock **,
-                           __u64);
-static int mdt_intent_glimpse(enum mdt_it_code opcode,
+static int mdt_intent_glimpse(enum ldlm_intent_flags it_opc,
                              struct mdt_thread_info *info,
                              struct ldlm_lock **lockp, __u64 flags)
 {
        return mdt_glimpse_enqueue(info, info->mti_mdt->mdt_namespace,
                                   lockp, flags);
 }
-static int mdt_intent_brw(enum mdt_it_code opcode,
+static int mdt_intent_brw(enum ldlm_intent_flags it_opc,
                          struct mdt_thread_info *info,
                          struct ldlm_lock **lockp, __u64 flags)
 {
@@ -3391,90 +3531,6 @@ static int mdt_intent_brw(enum mdt_it_code opcode,
                               lockp, flags);
 }
 
-static struct mdt_it_flavor {
-        const struct req_format *it_fmt;
-        __u32                    it_flags;
-        int                    (*it_act)(enum mdt_it_code ,
-                                         struct mdt_thread_info *,
-                                         struct ldlm_lock **,
-                                        __u64);
-        long                     it_reint;
-} mdt_it_flavor[] = {
-        [MDT_IT_OPEN]     = {
-                .it_fmt   = &RQF_LDLM_INTENT,
-                /*.it_flags = HABEO_REFERO,*/
-                .it_flags = 0,
-                .it_act   = mdt_intent_reint,
-                .it_reint = REINT_OPEN
-        },
-        [MDT_IT_OCREAT]   = {
-                .it_fmt   = &RQF_LDLM_INTENT,
-               /*
-                * 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
-        },
-        [MDT_IT_CREATE]   = {
-                .it_fmt   = &RQF_LDLM_INTENT,
-                .it_flags = MUTABOR,
-                .it_act   = mdt_intent_reint,
-                .it_reint = REINT_CREATE
-        },
-        [MDT_IT_GETATTR]  = {
-                .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
-                .it_flags = HABEO_REFERO,
-                .it_act   = mdt_intent_getattr
-        },
-        [MDT_IT_READDIR]  = {
-                .it_fmt   = NULL,
-                .it_flags = 0,
-                .it_act   = NULL
-        },
-        [MDT_IT_LOOKUP]   = {
-                .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
-                .it_flags = HABEO_REFERO,
-                .it_act   = mdt_intent_getattr
-        },
-        [MDT_IT_UNLINK]   = {
-                .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
-                .it_flags = MUTABOR,
-                .it_act   = NULL,
-                .it_reint = REINT_UNLINK
-        },
-        [MDT_IT_TRUNC]    = {
-                .it_fmt   = NULL,
-                .it_flags = MUTABOR,
-                .it_act   = NULL
-        },
-        [MDT_IT_GETXATTR] = {
-               .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
-               .it_flags = HABEO_CORPUS,
-               .it_act   = mdt_intent_getxattr
-        },
-       [MDT_IT_LAYOUT] = {
-               .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
-               .it_flags = 0,
-               .it_act   = mdt_intent_layout
-       },
-       [MDT_IT_GLIMPSE] = {
-               .it_fmt = &RQF_LDLM_INTENT,
-               .it_flags = 0,
-               .it_act = mdt_intent_glimpse,
-       },
-       [MDT_IT_BRW] = {
-               .it_fmt = &RQF_LDLM_INTENT,
-               .it_flags = 0,
-               .it_act = mdt_intent_brw,
-       },
-
-};
-
 int mdt_intent_lock_replace(struct mdt_thread_info *info,
                            struct ldlm_lock **lockp,
                            struct mdt_lock_handle *lh,
@@ -3614,10 +3670,10 @@ void mdt_intent_fixup_resent(struct mdt_thread_info *info,
                  dlmreq->lock_handle[0].cookie);
 }
 
-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_getxattr(enum ldlm_intent_flags it_opc,
+                              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;
@@ -3646,7 +3702,10 @@ static int mdt_intent_getxattr(enum mdt_it_code opcode,
        if (ldlm_rep == NULL ||
            OBD_FAIL_CHECK(OBD_FAIL_MDS_XATTR_REP)) {
                mdt_object_unlock(info,  info->mti_object, lhc, 1);
-               RETURN(err_serious(-EFAULT));
+               if (is_serious(rc))
+                       RETURN(rc);
+               else
+                       RETURN(err_serious(-EFAULT));
        }
 
        ldlm_rep->lock_policy_res2 = clear_serious(rc);
@@ -3664,7 +3723,7 @@ static int mdt_intent_getxattr(enum mdt_it_code opcode,
        RETURN(rc);
 }
 
-static int mdt_intent_getattr(enum mdt_it_code opcode,
+static int mdt_intent_getattr(enum ldlm_intent_flags it_opc,
                               struct mdt_thread_info *info,
                               struct ldlm_lock **lockp,
                              __u64 flags)
@@ -3687,18 +3746,19 @@ static int mdt_intent_getattr(enum mdt_it_code opcode,
        repbody->mbo_eadatasize = 0;
        repbody->mbo_aclsize = 0;
 
-        switch (opcode) {
-        case MDT_IT_LOOKUP:
+       switch (it_opc) {
+       case IT_LOOKUP:
                child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
-                break;
-        case MDT_IT_GETATTR:
+               break;
+       case IT_GETATTR:
                child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
                             MDS_INODELOCK_PERM;
-                break;
-        default:
-                CERROR("Unsupported intent (%d)\n", opcode);
-                GOTO(out_shrink, rc = -EINVAL);
-        }
+               break;
+       default:
+               CERROR("%s: unsupported intent %#x\n",
+                      mdt_obd_name(info->mti_mdt), (unsigned int)it_opc);
+               GOTO(out_shrink, rc = -EINVAL);
+       }
 
        rc = mdt_init_ucred_intent_getattr(info, reqbody);
        if (rc)
@@ -3733,7 +3793,7 @@ out_shrink:
         return rc;
 }
 
-static int mdt_intent_layout(enum mdt_it_code opcode,
+static int mdt_intent_layout(enum ldlm_intent_flags it_opc,
                             struct mdt_thread_info *info,
                             struct ldlm_lock **lockp,
                             __u64 flags)
@@ -3747,12 +3807,6 @@ static int mdt_intent_layout(enum mdt_it_code opcode,
        int rc = 0;
        ENTRY;
 
-       if (opcode != MDT_IT_LAYOUT) {
-               CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
-                       opcode);
-               RETURN(-EINVAL);
-       }
-
        fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
 
        intent = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
@@ -3812,6 +3866,8 @@ static int mdt_intent_layout(enum mdt_it_code opcode,
                        if (layout_size > info->mti_mdt->mdt_max_mdsize)
                                info->mti_mdt->mdt_max_mdsize = layout_size;
                }
+               CDEBUG(D_INFO, "%s: layout_size %d\n",
+                      mdt_obd_name(info->mti_mdt), layout_size);
        }
 
        /*
@@ -3883,13 +3939,13 @@ out_obj:
 out:
        lhc->mlh_reg_lh.cookie = 0;
 
-       return rc;
+       RETURN(rc);
 }
 
-static int mdt_intent_reint(enum mdt_it_code opcode,
-                            struct mdt_thread_info *info,
-                            struct ldlm_lock **lockp,
-                           __u64 flags)
+static int mdt_intent_open(enum ldlm_intent_flags it_opc,
+                          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      *rep = NULL;
@@ -3907,22 +3963,20 @@ static int mdt_intent_reint(enum mdt_it_code opcode,
         if (opc < 0)
                 RETURN(opc);
 
-        if (mdt_it_flavor[opcode].it_reint != opc) {
-                CERROR("Reint code %ld doesn't match intent: %d\n",
-                       opc, opcode);
-                RETURN(err_serious(-EPROTO));
-        }
-
        /* Get lock from request for possible resent case. */
        mdt_intent_fixup_resent(info, *lockp, lhc, flags);
 
         rc = mdt_reint_internal(info, lhc, opc);
 
-        /* Check whether the reply has been packed successfully. */
-        if (mdt_info_req(info)->rq_repmsg != NULL)
-                rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
-        if (rep == NULL)
-                RETURN(err_serious(-EFAULT));
+       /* Check whether the reply has been packed successfully. */
+       if (mdt_info_req(info)->rq_repmsg != NULL)
+               rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
+       if (rep == NULL) {
+               if (is_serious(rc))
+                       RETURN(rc);
+               else
+                       RETURN(err_serious(-EFAULT));
+       }
 
         /* MDC expects this in any case */
         if (rc != 0)
@@ -3962,75 +4016,60 @@ static int mdt_intent_reint(enum mdt_it_code opcode,
        RETURN(ELDLM_LOCK_ABORTED);
 }
 
-static int mdt_intent_code(enum ldlm_intent_flags itcode)
-{
+static int mdt_intent_opc(enum ldlm_intent_flags it_opc,
+                         struct mdt_thread_info *info,
+                         struct ldlm_lock **lockp,
+                         u64 flags /* LDLM_FL_* */)
+{
+       struct req_capsule *pill = info->mti_pill;
+       struct ptlrpc_request *req = mdt_info_req(info);
+       const struct req_format *it_format;
+       int (*it_handler)(enum ldlm_intent_flags,
+                         struct mdt_thread_info *,
+                         struct ldlm_lock **,
+                         u64);
+       enum tgt_handler_flags it_handler_flags = 0;
+       struct ldlm_reply *rep;
        int rc;
+       ENTRY;
 
-       switch (itcode) {
+       switch (it_opc) {
        case IT_OPEN:
-               rc = MDT_IT_OPEN;
-               break;
        case IT_OPEN|IT_CREAT:
-               rc = MDT_IT_OCREAT;
-               break;
-       case IT_CREAT:
-               rc = MDT_IT_CREATE;
-               break;
-       case IT_READDIR:
-               rc = MDT_IT_READDIR;
+               /*
+                * OCREAT is not a IS_MUTABLE request since the file may
+                * already exist. We do the extra check of
+                * OBD_CONNECT_RDONLY in mdt_reint_open() when we
+                * really need to create the object.
+                */
+               it_format = &RQF_LDLM_INTENT;
+               it_handler = &mdt_intent_open;
                break;
        case IT_GETATTR:
-               rc = MDT_IT_GETATTR;
-               break;
        case IT_LOOKUP:
-               rc = MDT_IT_LOOKUP;
-               break;
-       case IT_UNLINK:
-               rc = MDT_IT_UNLINK;
-               break;
-       case IT_TRUNC:
-               rc = MDT_IT_TRUNC;
+               it_format = &RQF_LDLM_INTENT_GETATTR;
+               it_handler = &mdt_intent_getattr;
+               it_handler_flags = HAS_REPLY;
                break;
        case IT_GETXATTR:
-               rc = MDT_IT_GETXATTR;
+               it_format = &RQF_LDLM_INTENT_GETXATTR;
+               it_handler = &mdt_intent_getxattr;
+               it_handler_flags = HAS_BODY;
                break;
        case IT_LAYOUT:
-               rc = MDT_IT_LAYOUT;
-               break;
-       case IT_QUOTA_DQACQ:
-       case IT_QUOTA_CONN:
-               rc = MDT_IT_QUOTA;
+               it_format = &RQF_LDLM_INTENT_LAYOUT;
+               it_handler = &mdt_intent_layout;
                break;
        case IT_GLIMPSE:
-               rc = MDT_IT_GLIMPSE;
+               it_format = &RQF_LDLM_INTENT;
+               it_handler = &mdt_intent_glimpse;
                break;
        case IT_BRW:
-               rc = MDT_IT_BRW;
-               break;
-       default:
-               CERROR("Unknown intent opcode: 0x%08x\n", itcode);
-               rc = -EINVAL;
+               it_format = &RQF_LDLM_INTENT;
+               it_handler = &mdt_intent_brw;
                break;
-       }
-       return rc;
-}
-
-static int mdt_intent_opc(enum ldlm_intent_flags itopc,
-                         struct mdt_thread_info *info,
-                         struct ldlm_lock **lockp, __u64 flags)
-{
-       struct req_capsule      *pill = info->mti_pill;
-       struct ptlrpc_request   *req = mdt_info_req(info);
-       struct mdt_it_flavor    *flv;
-       int opc;
-       int rc;
-       ENTRY;
-
-       opc = mdt_intent_code(itopc);
-       if (opc < 0)
-               RETURN(-EINVAL);
-
-       if (opc == MDT_IT_QUOTA) {
+       case IT_QUOTA_DQACQ:
+       case IT_QUOTA_CONN: {
                struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
 
                if (qmt == NULL)
@@ -4046,33 +4085,31 @@ static int mdt_intent_opc(enum ldlm_intent_flags itopc,
                                                 flags);
                RETURN(rc);
        }
+       default:
+               CERROR("%s: unknown intent code %#x\n",
+                      mdt_obd_name(info->mti_mdt), it_opc);
+               RETURN(-EPROTO);
+       }
 
-       flv = &mdt_it_flavor[opc];
-       if (flv->it_fmt != NULL)
-               req_capsule_extend(pill, flv->it_fmt);
+       req_capsule_extend(pill, it_format);
 
-       rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
+       rc = mdt_unpack_req_pack_rep(info, it_handler_flags);
        if (rc < 0)
                RETURN(rc);
 
-       if (flv->it_flags & MUTABOR && mdt_rdonly(req->rq_export))
+       if (it_handler_flags & IS_MUTABLE && mdt_rdonly(req->rq_export))
                RETURN(-EROFS);
 
-       if (flv->it_act != NULL) {
-               struct ldlm_reply *rep;
+       OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
 
-               OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_INTENT_DELAY, 10);
+       /* execute policy */
+       rc = (*it_handler)(it_opc, info, lockp, flags);
 
-               /* execute policy */
-               rc = flv->it_act(opc, info, lockp, flags);
-
-               /* Check whether the reply has been packed successfully. */
-               if (req->rq_repmsg != NULL) {
-                       rep = req_capsule_server_get(info->mti_pill,
-                                                    &RMF_DLM_REP);
-                       rep->lock_policy_res2 =
-                               ptlrpc_status_hton(rep->lock_policy_res2);
-               }
+       /* Check whether the reply has been packed successfully. */
+       if (req->rq_repmsg != NULL) {
+               rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
+               rep->lock_policy_res2 =
+                       ptlrpc_status_hton(rep->lock_policy_res2);
        }
 
        RETURN(rc);
@@ -4090,9 +4127,12 @@ static void mdt_ptlrpc_stats_update(struct ptlrpc_request *req,
                                LDLM_GLIMPSE_ENQUEUE : LDLM_IBITS_ENQUEUE));
 }
 
-static int mdt_intent_policy(struct ldlm_namespace *ns,
-                            struct ldlm_lock **lockp, void *req_cookie,
-                            enum ldlm_mode mode, __u64 flags, void *data)
+static int mdt_intent_policy(const struct lu_env *env,
+                            struct ldlm_namespace *ns,
+                            struct ldlm_lock **lockp,
+                            void *req_cookie,
+                            enum ldlm_mode mode,
+                            __u64 flags, void *data)
 {
        struct tgt_session_info *tsi;
        struct mdt_thread_info  *info;
@@ -4106,7 +4146,7 @@ static int mdt_intent_policy(struct ldlm_namespace *ns,
 
        LASSERT(req != NULL);
 
-       tsi = tgt_ses_info(req->rq_svc_thread->t_env);
+       tsi = tgt_ses_info(env);
 
        info = tsi2mdt_info(tsi);
        LASSERT(info != NULL);
@@ -4835,44 +4875,47 @@ 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,
+               HAS_REPLY,              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_GET_ROOT,   mdt_get_root),
-TGT_MDT_HDL(HABEO_CORPUS,              MDS_GETATTR,    mdt_getattr),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO,        MDS_GETATTR_NAME,
+TGT_MDT_HDL(HAS_REPLY,         MDS_GET_ROOT,   mdt_get_root),
+TGT_MDT_HDL(HAS_BODY,          MDS_GETATTR,    mdt_getattr),
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY,      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| HABEO_REFERO,        MDS_READPAGE,   mdt_readpage),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO,        MDS_SYNC,       mdt_sync),
+TGT_MDT_HDL(HAS_BODY,          MDS_GETXATTR,   mdt_tgt_getxattr),
+TGT_MDT_HDL(HAS_REPLY,         MDS_STATFS,     mdt_statfs),
+TGT_MDT_HDL(IS_MUTABLE,                MDS_REINT,      mdt_reint),
+TGT_MDT_HDL(HAS_BODY,          MDS_CLOSE,      mdt_close),
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY,      MDS_READPAGE,   mdt_readpage),
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY,      MDS_SYNC,       mdt_sync),
 TGT_MDT_HDL(0,                         MDS_QUOTACTL,   mdt_quotactl),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_PROGRESS,
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_PROGRESS,
                                                        mdt_hsm_progress),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_REGISTER,
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_CT_REGISTER,
                                                        mdt_hsm_ct_register),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_CT_UNREGISTER,
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, MDS_HSM_CT_UNREGISTER,
                                                        mdt_hsm_ct_unregister),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO, MDS_HSM_STATE_GET,
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_STATE_GET,
                                                        mdt_hsm_state_get),
-TGT_MDT_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR, MDS_HSM_STATE_SET,
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY | IS_MUTABLE, 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,
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_ACTION,      mdt_hsm_action),
+TGT_MDT_HDL(HAS_BODY | HAS_REPLY, MDS_HSM_REQUEST,
                                                        mdt_hsm_request),
-TGT_MDT_HDL(HABEO_CLAVIS | HABEO_CORPUS | HABEO_REFERO | MUTABOR,
+TGT_MDT_HDL(HAS_KEY | HAS_BODY | HAS_REPLY | IS_MUTABLE,
            MDS_SWAP_LAYOUTS,
            mdt_swap_layouts),
 };
 
 static struct tgt_handler mdt_io_ops[] = {
-TGT_OST_HDL(HABEO_CORPUS | HABEO_REFERO, OST_BRW_READ, tgt_brw_read),
-TGT_OST_HDL(HABEO_CORPUS | MUTABOR,     OST_BRW_WRITE, tgt_brw_write),
-TGT_OST_HDL(HABEO_CORPUS | HABEO_REFERO | MUTABOR,
-                                        OST_PUNCH,     mdt_punch_hdl),
-TGT_OST_HDL(HABEO_CORPUS | HABEO_REFERO, OST_SYNC,     mdt_data_sync),
+TGT_OST_HDL_HP(HAS_BODY | HAS_REPLY, OST_BRW_READ, tgt_brw_read,
+                                                       mdt_hp_brw),
+TGT_OST_HDL_HP(HAS_BODY | IS_MUTABLE,   OST_BRW_WRITE, tgt_brw_write,
+                                                       mdt_hp_brw),
+TGT_OST_HDL_HP(HAS_BODY | HAS_REPLY | IS_MUTABLE,
+                                        OST_PUNCH,     mdt_punch_hdl,
+                                                       mdt_hp_punch),
+TGT_OST_HDL(HAS_BODY | HAS_REPLY, OST_SYNC,    mdt_data_sync),
 };
 
 static struct tgt_handler mdt_sec_ctx_ops[] = {
@@ -4882,7 +4925,7 @@ 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),
+TGT_QUOTA_HDL(HAS_REPLY,               QUOTA_DQACQ,      mdt_quota_dqacq),
 };
 
 static struct tgt_opc_slice mdt_common_slice[] = {
@@ -4995,6 +5038,11 @@ static void mdt_fini(const struct lu_env *env, struct mdt_device *m)
 
        mdt_hsm_cdt_fini(m);
 
+       if (m->mdt_los != NULL) {
+               local_oid_storage_fini(env, m->mdt_los);
+               m->mdt_los = NULL;
+       }
+
        if (m->mdt_namespace != NULL) {
                ldlm_namespace_free_post(m->mdt_namespace);
                d->ld_obd->obd_namespace = m->mdt_namespace = NULL;
@@ -5038,6 +5086,7 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        struct seq_server_site *ss_site;
        const char *identity_upcall = "NONE";
        struct md_device *next;
+       struct lu_fid fid;
        int rc;
        long node_id;
        mntopt_t mntopts;
@@ -5062,7 +5111,7 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        obd = class_name2obd(dev);
        LASSERT(obd != NULL);
 
-       m->mdt_max_mdsize = MAX_MD_SIZE; /* 4 stripes */
+       m->mdt_max_mdsize = MAX_MD_SIZE_OLD;
        m->mdt_opts.mo_evict_tgt_nids = 1;
        m->mdt_opts.mo_cos = MDT_COS_DEFAULT;
 
@@ -5082,15 +5131,20 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        }
 
        /* DoM files get IO lock at open by default */
-       m->mdt_opts.mo_dom_lock = 1;
+       m->mdt_opts.mo_dom_lock = ALWAYS_DOM_LOCK_ON_OPEN;
+       /* DoM files are read at open and data is packed in the reply */
+       m->mdt_opts.mo_dom_read_open = 1;
 
        m->mdt_squash.rsi_uid = 0;
        m->mdt_squash.rsi_gid = 0;
        INIT_LIST_HEAD(&m->mdt_squash.rsi_nosquash_nids);
        init_rwsem(&m->mdt_squash.rsi_sem);
        spin_lock_init(&m->mdt_lock);
-       m->mdt_enable_remote_dir = 0;
+       m->mdt_enable_remote_dir = 1;
+       m->mdt_enable_striped_dir = 1;
+       m->mdt_enable_dir_migration = 1;
        m->mdt_enable_remote_dir_gid = 0;
+       m->mdt_enable_remote_rename = 1;
 
        atomic_set(&m->mdt_mds_mds_conns, 0);
        atomic_set(&m->mdt_async_commit_count, 0);
@@ -5156,18 +5210,11 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        /* set obd_namespace for compatibility with old code */
        obd->obd_namespace = m->mdt_namespace;
 
-       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 = 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_free_hsm, rc);
+               GOTO(err_free_ns, rc);
 
        /* Amount of available space excluded from granting and reserved
         * for metadata. It is in percentage and 50% is default value. */
@@ -5182,6 +5229,20 @@ static int mdt_init0(const struct lu_env *env, struct mdt_device *m,
        if (rc)
                GOTO(err_tgt, rc);
 
+       fid.f_seq = FID_SEQ_LOCAL_NAME;
+       fid.f_oid = 1;
+       fid.f_ver = 0;
+       rc = local_oid_storage_init(env, m->mdt_bottom, &fid, &m->mdt_los);
+       if (rc != 0)
+               GOTO(err_fs_cleanup, 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_los_fini, rc);
+       }
+
        tgt_adapt_sptlrpc_conf(&m->mdt_lut);
 
        next = m->mdt_child;
@@ -5212,7 +5273,7 @@ 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_fs_cleanup, rc);
+               GOTO(err_free_hsm, rc);
        }
 
        rc = mdt_procfs_init(m, dev);
@@ -5248,12 +5309,15 @@ err_recovery:
        target_recovery_fini(obd);
        upcall_cache_cleanup(m->mdt_identity_cache);
        m->mdt_identity_cache = NULL;
+err_free_hsm:
+       mdt_hsm_cdt_fini(m);
+err_los_fini:
+       local_oid_storage_fini(env, m->mdt_los);
+       m->mdt_los = NULL;
 err_fs_cleanup:
        mdt_fs_cleanup(env, m);
 err_tgt:
        tgt_fini(env, &m->mdt_lut);
-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;
@@ -5374,6 +5438,7 @@ static struct lu_object *mdt_object_alloc(const struct lu_env *env,
                lu_object_add_top(h, o);
                o->lo_ops = &mdt_obj_ops;
                spin_lock_init(&mo->mot_write_lock);
+               mutex_init(&mo->mot_som_mutex);
                mutex_init(&mo->mot_lov_mutex);
                init_rwsem(&mo->mot_dom_sem);
                init_rwsem(&mo->mot_open_sem);
@@ -5549,6 +5614,7 @@ static int mdt_connect_internal(const struct lu_env *env,
                                struct mdt_device *mdt,
                                struct obd_connect_data *data, bool reconnect)
 {
+       const char *obd_name = mdt_obd_name(mdt);
        LASSERT(data != NULL);
 
        data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
@@ -5577,8 +5643,7 @@ static int mdt_connect_internal(const struct lu_env *env,
                               "ocd_version: %x ocd_grant: %d ocd_index: %u "
                               "ocd_brw_size unexpectedly zero, network data "
                               "corruption? Refusing to connect this client\n",
-                              mdt_obd_name(mdt),
-                              exp->exp_client_uuid.uuid,
+                              obd_name, exp->exp_client_uuid.uuid,
                               exp, data->ocd_connect_flags, data->ocd_version,
                               data->ocd_grant, data->ocd_index);
                        return -EPROTO;
@@ -5599,12 +5664,12 @@ static int mdt_connect_internal(const struct lu_env *env,
                data->ocd_grant_max_blks = ddp->ddp_max_extent_blks;
        }
 
-       if (OCD_HAS_FLAG(data, GRANT)) {
-               /* Save connect_data we have so far because tgt_grant_connect()
-                * uses it to calculate grant. */
-               exp->exp_connect_data = *data;
+       /* Save connect_data we have so far because tgt_grant_connect()
+        * uses it to calculate grant, and we want to save the client
+        * version before it is overwritten by LUSTRE_VERSION_CODE. */
+       exp->exp_connect_data = *data;
+       if (OCD_HAS_FLAG(data, GRANT))
                tgt_grant_connect(env, exp, data, !reconnect);
-       }
 
        if (OCD_HAS_FLAG(data, MAXBYTES))
                data->ocd_maxbytes = mdt->mdt_lut.lut_dt_conf.ddp_maxbytes;
@@ -5624,7 +5689,7 @@ static int mdt_connect_internal(const struct lu_env *env,
 
        if ((data->ocd_connect_flags & OBD_CONNECT_FID) == 0) {
                CWARN("%s: MDS requires FID support, but client not\n",
-                     mdt_obd_name(mdt));
+                     obd_name);
                return -EBADE;
        }
 
@@ -5658,7 +5723,8 @@ static int mdt_connect_internal(const struct lu_env *env,
                /* The client set in ocd_cksum_types the checksum types it
                 * supports. We have to mask off the algorithms that we don't
                 * support */
-               data->ocd_cksum_types &= cksum_types_supported_server();
+               data->ocd_cksum_types &=
+                       obd_cksum_types_supported_server(obd_name);
 
                if (unlikely(data->ocd_cksum_types == 0)) {
                        CERROR("%s: Connect with checksum support but no "
@@ -5726,7 +5792,7 @@ static int mdt_export_cleanup(struct obd_export *exp)
 
                /* Remove mfd handle so it can't be found again.
                 * We are consuming the mfd_list reference here. */
-               class_handle_unhash(&mfd->mfd_handle);
+               class_handle_unhash(&mfd->mfd_open_handle);
                list_move_tail(&mfd->mfd_list, &closing_list);
        }
        spin_unlock(&med->med_open_lock);
@@ -5767,7 +5833,7 @@ static int mdt_export_cleanup(struct obd_export *exp)
                         * archive request into a noop if it's not actually
                         * dirty.
                         */
-                       if (mfd->mfd_mode & FMODE_WRITE)
+                       if (mfd->mfd_open_flags & MDS_FMODE_WRITE)
                                rc = mdt_ctxt_add_dirty_flag(&env, info, mfd);
 
                        /* Don't unlink orphan on failover umount, LU-184 */
@@ -6666,12 +6732,12 @@ struct lu_ucred *mdt_ucred_check(const struct mdt_thread_info *info)
  * \param mdt mdt device
  * \param val 0 disables COS, other values enable COS
  */
-void mdt_enable_cos(struct mdt_device *mdt, int val)
+void mdt_enable_cos(struct mdt_device *mdt, bool val)
 {
         struct lu_env env;
         int rc;
 
-        mdt->mdt_opts.mo_cos = !!val;
+       mdt->mdt_opts.mo_cos = val;
         rc = lu_env_init(&env, LCT_LOCAL);
        if (unlikely(rc != 0)) {
                CWARN("%s: lu_env initialization failed, cannot "