Whamcloud - gitweb
b=18518
[fs/lustre-release.git] / lustre / obdfilter / filter.c
index 3daebea..c8d25cf 100644 (file)
@@ -87,12 +87,41 @@ cfs_mem_cache_t *ll_fmd_cachep;
 static void filter_commit_cb(struct obd_device *obd, __u64 transno,
                              void *cb_data, int error)
 {
-        obd_transno_commit_cb(obd, transno, error);
+        struct obd_export *exp = cb_data;
+        LASSERT(exp->exp_obd == obd);
+        obd_transno_commit_cb(obd, transno, exp, error);
+        atomic_dec(&exp->exp_cb_count);
+        class_export_put(exp);
+}
+
+int filter_version_get_check(struct obd_export *exp,
+                             struct obd_trans_info *oti, struct inode *inode)
+{
+        __u64 curr_version;
+
+        if (inode == NULL || oti == NULL)
+                RETURN(0);
+
+        curr_version = fsfilt_get_version(exp->exp_obd, inode);
+        if ((__s64)curr_version == -EOPNOTSUPP)
+                RETURN(0);
+        /* VBR: version is checked always because costs nothing */
+        if (oti->oti_pre_version != 0 &&
+            oti->oti_pre_version != curr_version) {
+                CDEBUG(D_INODE, "Version mismatch "LPX64" != "LPX64"\n",
+                       oti->oti_pre_version, curr_version);
+                spin_lock(&exp->exp_lock);
+                exp->exp_vbr_failed = 1;
+                spin_unlock(&exp->exp_lock);
+                RETURN (-EOVERFLOW);
+        }
+        oti->oti_pre_version = curr_version;
+        RETURN(0);
 }
 
 /* Assumes caller has already pushed us into the kernel context. */
-int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
-                          int rc, int force_sync)
+int filter_finish_transno(struct obd_export *exp, struct inode *inode,
+                          struct obd_trans_info *oti, int rc, int force_sync)
 {
         struct filter_obd *filter = &exp->exp_obd->u.filter;
         struct filter_export_data *fed = &exp->exp_filter_data;
@@ -109,24 +138,28 @@ int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
                 RETURN(rc);
 
         /* we don't allocate new transnos for replayed requests */
+        spin_lock(&filter->fo_translock);
         if (oti->oti_transno == 0) {
-                spin_lock(&filter->fo_translock);
                 last_rcvd = le64_to_cpu(filter->fo_fsd->lsd_last_transno) + 1;
                 filter->fo_fsd->lsd_last_transno = cpu_to_le64(last_rcvd);
-                spin_unlock(&filter->fo_translock);
-                oti->oti_transno = last_rcvd;
         } else {
-                spin_lock(&filter->fo_translock);
                 last_rcvd = oti->oti_transno;
                 if (last_rcvd > le64_to_cpu(filter->fo_fsd->lsd_last_transno))
                         filter->fo_fsd->lsd_last_transno =
                                 cpu_to_le64(last_rcvd);
+        }
+        oti->oti_transno = last_rcvd;
+        if (last_rcvd <= le64_to_cpu(lcd->lcd_last_transno)) {
                 spin_unlock(&filter->fo_translock);
+                LBUG();
         }
         lcd->lcd_last_transno = cpu_to_le64(last_rcvd);
+        lcd->lcd_pre_versions[0] = cpu_to_le64(oti->oti_pre_version);
+        lcd->lcd_last_xid = cpu_to_le64(oti->oti_xid);
+        spin_unlock(&filter->fo_translock);
 
-        /* could get xid from oti, if it's ever needed */
-        lcd->lcd_last_xid = 0;
+        if (inode)
+                fsfilt_set_version(exp->exp_obd, inode, last_rcvd);
 
         off = fed->fed_lr_off;
         if (off <= 0) {
@@ -134,18 +167,20 @@ int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
                        fed->fed_lr_idx, fed->fed_lr_off);
                 err = -EINVAL;
         } else {
+                class_export_get(exp); /* released when the cb is called */
+                atomic_inc(&exp->exp_cb_count);
                 if (!force_sync)
                         force_sync = fsfilt_add_journal_cb(exp->exp_obd,
                                                            last_rcvd,
                                                            oti->oti_handle,
                                                            filter_commit_cb,
-                                                           NULL);
+                                                           exp);
 
                 err = fsfilt_write_record(exp->exp_obd, filter->fo_rcvd_filp,
                                           lcd, sizeof(*lcd), &off,
                                           force_sync | exp->exp_need_sync);
                 if (force_sync)
-                        filter_commit_cb(exp->exp_obd, last_rcvd, NULL, err);
+                        filter_commit_cb(exp->exp_obd, last_rcvd, exp, err);
         }
         if (err) {
                 log_pri = D_ERROR;
@@ -183,7 +218,7 @@ static int lprocfs_init_rw_stats(struct obd_device *obd,
 
         num_stats = (sizeof(*obd->obd_type->typ_dt_ops) / sizeof(void *)) +
                                                         LPROC_FILTER_LAST - 1;
-        *stats = lprocfs_alloc_stats(num_stats, 0);
+        *stats = lprocfs_alloc_stats(num_stats, LPROCFS_STATS_FLAG_NOPERCPU);
         if (*stats == NULL)
                 return -ENOMEM;
 
@@ -202,12 +237,9 @@ static int filter_export_stats_init(struct obd_device *obd,
                                     struct obd_export *exp,
                                     void *client_nid)
 {
-        struct filter_export_data *fed = &exp->exp_filter_data;
         int rc, newnid = 0;
         ENTRY;
 
-        init_brw_stats(&fed->fed_brw_stats);
-
         if (obd_uuid_equals(&exp->exp_client_uuid, &obd->obd_uuid))
                 /* Self-export gets no proc entry */
                 RETURN(0);
@@ -245,8 +277,9 @@ static int filter_export_stats_init(struct obd_device *obd,
                 if (rc)
                         RETURN(rc);
                 /* Always add in ldlm_stats */
-                tmp->nid_ldlm_stats = lprocfs_alloc_stats(LDLM_LAST_OPC -
-                                                          LDLM_FIRST_OPC, 0);
+                tmp->nid_ldlm_stats = 
+                        lprocfs_alloc_stats(LDLM_LAST_OPC - LDLM_FIRST_OPC,
+                                            LPROCFS_STATS_FLAG_NOPERCPU);
                 if (tmp->nid_ldlm_stats == NULL)
                         return -ENOMEM;
 
@@ -331,6 +364,9 @@ static int filter_client_add(struct obd_device *obd, struct obd_export *exp,
                         rc = PTR_ERR(handle);
                         CERROR("unable to start transaction: rc %d\n", rc);
                 } else {
+                        fed->fed_lcd->lcd_last_epoch =
+                                              filter->fo_fsd->lsd_start_epoch;
+                        exp->exp_last_request_time = cfs_time_current_sec();
                         rc = fsfilt_add_journal_cb(obd, 0, handle,
                                                    target_client_add_cb, exp);
                         if (rc == 0) {
@@ -357,12 +393,13 @@ static int filter_client_add(struct obd_device *obd, struct obd_export *exp,
         RETURN(0);
 }
 
+struct lsd_client_data zero_lcd; /* globals are implicitly zeroed */
+
 static int filter_client_free(struct obd_export *exp)
 {
         struct filter_export_data *fed = &exp->exp_filter_data;
         struct filter_obd *filter = &exp->exp_obd->u.filter;
         struct obd_device *obd = exp->exp_obd;
-        struct lsd_client_data zero_lcd;
         struct lvfs_run_ctxt saved;
         int rc;
         loff_t off;
@@ -375,13 +412,13 @@ static int filter_client_free(struct obd_export *exp)
         if (strcmp(fed->fed_lcd->lcd_uuid, obd->obd_uuid.uuid ) == 0)
                 GOTO(free, 0);
 
-        CDEBUG(D_INFO, "freeing client at idx %u, offset %lld with UUID '%s'\n",
-               fed->fed_lr_idx, fed->fed_lr_off, fed->fed_lcd->lcd_uuid);
-
         LASSERT(filter->fo_last_rcvd_slots != NULL);
 
         off = fed->fed_lr_off;
 
+        CDEBUG(D_INFO, "freeing client at idx %u, offset %lld with UUID '%s'\n",
+               fed->fed_lr_idx, fed->fed_lr_off, fed->fed_lcd->lcd_uuid);
+
         /* Don't clear fed_lr_idx here as it is likely also unset.  At worst
          * we leak a client slot that will be cleaned on the next recovery. */
         if (off <= 0) {
@@ -399,23 +436,26 @@ static int filter_client_free(struct obd_export *exp)
         }
 
         if (!(exp->exp_flags & OBD_OPT_FAILOVER)) {
-                memset(&zero_lcd, 0, sizeof zero_lcd);
+                /* Don't force sync on disconnect if aborting recovery,
+                 * or it does num_clients * num_osts.  b=17194 */
+                int need_sync = exp->exp_need_sync &&
+                                 !(exp->exp_flags&OBD_OPT_ABORT_RECOV);
                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
                 rc = fsfilt_write_record(obd, filter->fo_rcvd_filp, &zero_lcd,
-                                         sizeof(zero_lcd), &off,
-                                         (!exp->exp_libclient ||
-                                          exp->exp_need_sync));
+                                         sizeof(zero_lcd), &off, 0);
+
+                /* Make sure the server's last_transno is up to date. Do this
+                 * after the client is freed so we know all the client's
+                 * transactions have been committed. */
                 if (rc == 0)
-                        /* update server's transno */
                         filter_update_server_data(obd, filter->fo_rcvd_filp,
-                                                  filter->fo_fsd,
-                                                  !exp->exp_libclient);
+                                                  filter->fo_fsd, need_sync);
                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 
                 CDEBUG(rc == 0 ? D_INFO : D_ERROR,
-                       "zeroing out client %s at idx %u (%llu) in %s rc %d\n",
+                       "zero out client %s at idx %u/%llu in %s %ssync rc %d\n",
                        fed->fed_lcd->lcd_uuid, fed->fed_lr_idx, fed->fed_lr_off,
-                       LAST_RCVD, rc);
+                       LAST_RCVD, need_sync ? "" : "a", rc);
         }
 
         if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
@@ -541,7 +581,7 @@ struct filter_mod_data *filter_fmd_get(struct obd_export *exp,
         struct filter_export_data *fed = &exp->exp_filter_data;
         struct filter_mod_data *found = NULL, *fmd_new = NULL;
 
-        OBD_SLAB_ALLOC(fmd_new, ll_fmd_cachep, CFS_ALLOC_IO, sizeof(*fmd_new));
+        OBD_SLAB_ALLOC_PTR_GFP(fmd_new, ll_fmd_cachep, CFS_ALLOC_IO);
 
         spin_lock(&fed->fed_lock);
         found = filter_fmd_find_nolock(&exp->exp_obd->u.filter,fed,objid,group);
@@ -617,7 +657,7 @@ static int filter_init_export(struct obd_export *exp)
 
 static int filter_free_server_data(struct filter_obd *filter)
 {
-        OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd));
+        OBD_FREE_PTR(filter->fo_fsd);
         filter->fo_fsd = NULL;
         OBD_FREE(filter->fo_last_rcvd_slots, LR_MAX_CLIENTS / 8);
         filter->fo_last_rcvd_slots = NULL;
@@ -638,7 +678,6 @@ int filter_update_server_data(struct obd_device *obd, struct file *filp,
         CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
                le64_to_cpu(fsd->lsd_mount_count));
 
-        fsd->lsd_compat14 = fsd->lsd_last_transno;
         rc = fsfilt_write_record(obd, filp, fsd, sizeof(*fsd), &off, force_sync);
         if (rc)
                 CERROR("error writing lr_server_data: rc = %d\n", rc);
@@ -682,6 +721,7 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
         struct inode *inode = filp->f_dentry->d_inode;
         unsigned long last_rcvd_size = i_size_read(inode);
         __u64 mount_count;
+        __u32 start_epoch;
         int cl_idx;
         loff_t off = 0;
         int rc;
@@ -753,7 +793,11 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
                 GOTO(err_fsd, rc = -EINVAL);
         }
 
-        CDEBUG(D_INODE, "%s: server last_transno : "LPU64"\n",
+        start_epoch = le32_to_cpu(fsd->lsd_start_epoch);
+
+        CDEBUG(D_INODE, "%s: server start_epoch : %#x\n",
+               obd->obd_name, start_epoch);
+        CDEBUG(D_INODE, "%s: server last_transno : "LPX64"\n",
                obd->obd_name, le64_to_cpu(fsd->lsd_last_transno));
         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
                obd->obd_name, mount_count + 1);
@@ -833,12 +877,16 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
                         /* can't fail for existing client */
                         LASSERTF(rc == 0, "rc = %d\n", rc);
 
-                        lcd = NULL;
+                        /* VBR: set export last committed */
+                        exp->exp_last_committed = last_rcvd;
                         spin_lock(&exp->exp_lock);
                         exp->exp_connecting = 0;
                         exp->exp_in_recovery = 0;
                         spin_unlock(&exp->exp_lock);
+                        spin_lock_bh(&obd->obd_processing_task_lock);
                         obd->obd_max_recoverable_clients++;
+                        spin_unlock_bh(&obd->obd_processing_task_lock);
+                        lcd = NULL;
                         class_export_put(exp);
                 }
 
@@ -855,7 +903,7 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
 
         obd->obd_last_committed = le64_to_cpu(fsd->lsd_last_transno);
 
-        target_recovery_init(obd, ost_handle);
+        target_recovery_init(&filter->fo_lut, ost_handle);
 
 out:
         filter->fo_mount_count = mount_count + 1;
@@ -1307,6 +1355,9 @@ static int filter_prep(struct obd_device *obd)
                 GOTO(err_filp, rc = -EOPNOTSUPP);
         }
 
+        /** lu_target has very limited use in filter now */
+        lut_init(NULL, &filter->fo_lut, obd, NULL);
+
         rc = filter_init_server_data(obd, file);
         if (rc) {
                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
@@ -1530,9 +1581,8 @@ struct dentry *filter_fid2dentry(struct obd_device *obd,
 }
 
 static int filter_prepare_destroy(struct obd_device *obd, obd_id objid,
-                                  obd_id group)
+                                  obd_id group, struct lustre_handle *lockh)
 {
-        struct lustre_handle lockh;
         int flags = LDLM_AST_DISCARD_DATA, rc;
         struct ldlm_res_id res_id;
         ldlm_policy_data_t policy = { .l_extent = { 0, OBD_OBJECT_EOF } };
@@ -1544,15 +1594,19 @@ static int filter_prepare_destroy(struct obd_device *obd, obd_id objid,
         rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_EXTENT,
                                     &policy, LCK_PW, &flags, ldlm_blocking_ast,
                                     ldlm_completion_ast, NULL, NULL, 0, NULL,
-                                    NULL, &lockh);
-
-        /* We only care about the side-effects, just drop the lock. */
-        if (rc == ELDLM_OK)
-                ldlm_lock_decref(&lockh, LCK_PW);
-
+                                    NULL, lockh);
+        if (rc != ELDLM_OK)
+                lockh->cookie = 0;
         RETURN(rc);
 }
 
+static void filter_fini_destroy(struct obd_device *obd,
+                                struct lustre_handle *lockh)
+{
+        if (lockh->cookie)
+                ldlm_lock_decref(lockh, LCK_PW);
+}
+
 /* This is vfs_unlink() without down(i_sem).  If we call regular vfs_unlink()
  * we have 2.6 lock ordering issues with filter_commitrw_write() as it takes
  * i_sem before starting a handle, while filter_destroy() + vfs_unlink do the
@@ -2012,7 +2066,11 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         if (rc != 0)
                 GOTO(err_ops, rc);
 
-        LASSERT(!lvfs_check_rdonly(lvfs_sbdev(mnt->mnt_sb)));
+        if (lvfs_check_rdonly(lvfs_sbdev(mnt->mnt_sb))) {
+                CERROR("%s: Underlying device is marked as read-only. "
+                       "Setup failed\n", obd->obd_name);
+                GOTO(err_ops, rc = -EROFS);
+        }
 
         /* failover is the default */
         obd->obd_replayable = 1;
@@ -2055,7 +2113,7 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         sema_init(&filter->fo_alloc_lock, 1);
         init_brw_stats(&filter->fo_filter_stats);
         filter->fo_read_cache = 1; /* enable read-only cache by default */
-        filter->fo_writethrough_cache = 1; /* disable writethrough cache */
+        filter->fo_writethrough_cache = 1; /* enable writethrough cache */
         filter->fo_readcache_max_filesize = FILTER_MAX_CACHE_SIZE;
         filter->fo_fmd_max_num = FILTER_FMD_MAX_NUM_DEFAULT;
         filter->fo_fmd_max_age = FILTER_FMD_MAX_AGE_DEFAULT;
@@ -2064,10 +2122,11 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         spin_lock_init(&filter->fo_llog_list_lock);
 
         filter->fo_fl_oss_capa = 1;
+
         CFS_INIT_LIST_HEAD(&filter->fo_capa_keys);
         filter->fo_capa_hash = init_capa_hash();
         if (filter->fo_capa_hash == NULL)
-                GOTO(err_ops, rc = -ENOMEM);
+                GOTO(err_post, rc = -ENOMEM);
 
         sprintf(ns_name, "filter-%s", obd->obd_uuid.uuid);
         obd->obd_namespace = ldlm_namespace_new(obd, ns_name, LDLM_NAMESPACE_SERVER,
@@ -2118,17 +2177,14 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         if (obd->obd_recovering) {
                 LCONSOLE_WARN("OST %s now serving %s (%s%s%s), but will be in "
                               "recovery for at least %d:%.02d, or until %d "
-                              "client%s reconnect. During this time new clients"
-                              " will not be allowed to connect. "
-                              "Recovery progress can be monitored by watching "
-                              "/proc/fs/lustre/obdfilter/%s/recovery_status.\n",
+                              "client%s reconnect%s.\n",
                               obd->obd_name, lustre_cfg_string(lcfg, 1),
                               label ?: "", label ? "/" : "", str,
                               obd->obd_recovery_timeout / 60,
                               obd->obd_recovery_timeout % 60,
                               obd->obd_max_recoverable_clients,
                               (obd->obd_max_recoverable_clients == 1) ? "":"s",
-                              obd->obd_name);
+                              (obd->obd_max_recoverable_clients == 1) ? "s":"");
         } else {
                 LCONSOLE_INFO("OST %s now serving %s (%s%s%s) with recovery "
                               "%s\n", obd->obd_name, lustre_cfg_string(lcfg, 1),
@@ -2322,7 +2378,7 @@ filter_default_olg_init(struct obd_device *obd, struct obd_llog_group *olg,
                        LLOG_MDS_OST_REPL_CTXT);
                 GOTO(cleanup_olg, rc = -ENODEV);
         }
-        ctxt->loc_lcm = filter->fo_lcm;
+        ctxt->loc_lcm = lcm_get(filter->fo_lcm);
         ctxt->llog_proc_cb = filter_recov_log_mds_ost_cb;
         llog_ctxt_put(ctxt);
 
@@ -2361,7 +2417,7 @@ filter_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
                 RETURN(-ENODEV);
         }
         ctxt->llog_proc_cb = filter_recov_log_mds_ost_cb;
-        ctxt->loc_lcm = filter->fo_lcm;
+        ctxt->loc_lcm = lcm_get(filter->fo_lcm);
         llog_ctxt_put(ctxt);
         RETURN(rc);
 }
@@ -2396,8 +2452,10 @@ static int filter_llog_finish(struct obd_device *obd, int count)
         }
 
         if (filter->fo_lcm) {
+                mutex_down(&ctxt->loc_sem);
                 llog_recov_thread_fini(filter->fo_lcm, obd->obd_force);
                 filter->fo_lcm = NULL;
+                mutex_up(&ctxt->loc_sem);
         }
         RETURN(filter_olg_fini(&obd->obd_olg));
 }
@@ -2521,6 +2579,9 @@ static int filter_llog_connect(struct obd_export *exp,
               obd->obd_name, body->lgdc_logid.lgl_oid,
               body->lgdc_logid.lgl_ogr, body->lgdc_logid.lgl_ogen);
 
+        spin_lock_bh(&obd->obd_processing_task_lock);
+        obd->u.filter.fo_mds_ost_sync = 1;
+        spin_unlock_bh(&obd->obd_processing_task_lock);
         rc = llog_connect(ctxt, &body->lgdc_logid,
                           &body->lgdc_gen, NULL);
         llog_ctxt_put(ctxt);
@@ -2577,7 +2638,8 @@ static int filter_precleanup(struct obd_device *obd,
         case OBD_CLEANUP_EARLY:
                 break;
         case OBD_CLEANUP_EXPORTS:
-                target_cleanup_recovery(obd);
+                /* Stop recovery before namespace cleanup. */
+                target_recovery_fini(obd);
                 rc = filter_llog_preclean(obd);
                 break;
         }
@@ -2593,14 +2655,8 @@ static int filter_cleanup(struct obd_device *obd)
                 LCONSOLE_WARN("%s: shutting down for failover; client state "
                               "will be preserved.\n", obd->obd_name);
 
-        if (!list_empty(&obd->obd_exports)) {
-                CERROR("%s: still has clients!\n", obd->obd_name);
-                class_disconnect_exports(obd);
-                if (!list_empty(&obd->obd_exports)) {
-                        CERROR("still has exports after forced cleanup?\n");
-                        RETURN(-EBUSY);
-                }
-        }
+        obd_exports_barrier(obd);
+        obd_zombie_barrier();
 
         lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
         lprocfs_free_per_client_stats(obd);
@@ -2608,10 +2664,6 @@ static int filter_cleanup(struct obd_device *obd)
         lprocfs_obd_cleanup(obd);
         lquota_cleanup(filter_quota_interface_ref, obd);
 
-        /* Stop recovery before namespace cleanup. */
-        target_stop_recovery_thread(obd);
-        target_cleanup_recovery(obd);
-
         ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
         obd->obd_namespace = NULL;
 
@@ -2665,7 +2717,13 @@ static int filter_connect_internal(struct obd_export *exp,
         exp->exp_connect_flags = data->ocd_connect_flags;
         data->ocd_version = LUSTRE_VERSION_CODE;
 
+        /* Kindly make sure the SKIP_ORPHAN flag is from MDS. */
+        if (!ergo(data->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN,
+                  data->ocd_connect_flags & OBD_CONNECT_MDS))
+                RETURN(-EPROTO);
+
         if (exp->exp_connect_flags & OBD_CONNECT_GRANT) {
+                struct filter_obd *filter = &exp->exp_obd->u.filter;
                 obd_size left, want;
 
                 spin_lock(&exp->exp_obd->obd_osfs_lock);
@@ -2679,6 +2737,8 @@ static int filter_connect_internal(struct obd_export *exp,
                        LPU64" left: "LPU64"\n", exp->exp_obd->obd_name,
                        exp->exp_client_uuid.uuid, exp,
                        data->ocd_grant, want, left);
+                
+                filter->fo_tot_granted_clients ++;
         }
 
         if (data->ocd_connect_flags & OBD_CONNECT_INDEX) {
@@ -2702,6 +2762,10 @@ static int filter_connect_internal(struct obd_export *exp,
                                            data->ocd_index);
                         RETURN(-EBADF);
                 }
+                /* FIXME: Do the same with the MDS UUID and fsd_peeruuid.
+                 * FIXME: We don't strictly need the COMPAT flag for that,
+                 * FIXME: as fsd_peeruuid[0] will tell us if that is set.
+                 * FIXME: We needed it for the index, as index 0 is valid. */
         }
 
         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_SIZE)) {
@@ -2736,11 +2800,6 @@ static int filter_connect_internal(struct obd_export *exp,
                                    obd_export_nid2str(exp));
         }
 
-        /* FIXME: Do the same with the MDS UUID and fsd_peeruuid.
-         * FIXME: We don't strictly need the COMPAT flag for that,
-         * FIXME: as fsd_peeruuid[0] will tell us if that is set.
-         * FIXME: We needed it for the index, as index 0 is valid. */
-
         RETURN(0);
 }
 
@@ -2765,34 +2824,35 @@ static int filter_reconnect(const struct lu_env *env,
 
 /* nearly identical to mds_connect */
 static int filter_connect(const struct lu_env *env,
-                          struct lustre_handle *conn, struct obd_device *obd,
+                          struct obd_export **exp, struct obd_device *obd,
                           struct obd_uuid *cluuid,
                           struct obd_connect_data *data, void *localdata)
 {
         struct lvfs_run_ctxt saved;
-        struct obd_export *exp;
+        struct lustre_handle conn = { 0 };
+        struct obd_export *lexp;
         struct filter_export_data *fed;
         struct lsd_client_data *lcd = NULL;
         __u32 group;
         int rc;
         ENTRY;
 
-        if (conn == NULL || obd == NULL || cluuid == NULL)
+        if (exp == NULL || obd == NULL || cluuid == NULL)
                 RETURN(-EINVAL);
 
-        rc = class_connect(conn, obd, cluuid);
+        rc = class_connect(&conn, obd, cluuid);
         if (rc)
                 RETURN(rc);
-        exp = class_conn2export(conn);
-        LASSERT(exp != NULL);
+        lexp = class_conn2export(&conn);
+        LASSERT(lexp != NULL);
 
-        fed = &exp->exp_filter_data;
+        fed = &lexp->exp_filter_data;
 
-        rc = filter_connect_internal(exp, data);
+        rc = filter_connect_internal(lexp, data);
         if (rc)
                 GOTO(cleanup, rc);
 
-        filter_export_stats_init(obd, exp, localdata);
+        filter_export_stats_init(obd, lexp, localdata);
         if (obd->obd_replayable) {
                 OBD_ALLOC(lcd, sizeof(*lcd));
                 if (!lcd) {
@@ -2802,7 +2862,7 @@ static int filter_connect(const struct lu_env *env,
 
                 memcpy(lcd->lcd_uuid, cluuid, sizeof(lcd->lcd_uuid));
                 fed->fed_lcd = lcd;
-                rc = filter_client_add(obd, exp, -1);
+                rc = filter_client_add(obd, lexp, -1);
                 if (rc)
                         GOTO(cleanup, rc);
         }
@@ -2810,7 +2870,7 @@ static int filter_connect(const struct lu_env *env,
         group = data->ocd_group;
 
         CWARN("%s: Received MDS connection ("LPX64"); group %d\n",
-              obd->obd_name, exp->exp_handle.h_cookie, group);
+              obd->obd_name, lexp->exp_handle.h_cookie, group);
 
         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
         rc = filter_read_groups(obd, group, 1);
@@ -2828,9 +2888,10 @@ cleanup:
                         OBD_FREE_PTR(lcd);
                         fed->fed_lcd = NULL;
                 }
-                class_disconnect(exp);
+                class_disconnect(lexp);
+                *exp = NULL;
         } else {
-                class_export_put(exp);
+                *exp = lexp;
         }
 
         RETURN(rc);
@@ -2974,6 +3035,12 @@ static int filter_destroy_export(struct obd_export *exp)
         filter_grant_discard(exp);
         filter_fmd_cleanup(exp);
 
+        if (exp->exp_connect_flags & OBD_CONNECT_GRANT_SHRINK) {
+                struct filter_obd *filter = &exp->exp_obd->u.filter;
+                if (filter->fo_tot_granted_clients > 0)
+                        filter->fo_tot_granted_clients --;
+        }
+
         if (!(exp->exp_flags & OBD_OPT_FORCE))
                 filter_grant_sanity_check(exp->exp_obd, __FUNCTION__);
 
@@ -3051,6 +3118,8 @@ static int filter_disconnect(struct obd_export *exp)
         /* Flush any remaining cancel messages out to the target */
         filter_sync_llogs(obd, exp);
 
+        lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
+
         /* Disconnect early so that clients can't keep using export */
         rc = class_disconnect(exp);
         if (exp->exp_obd->obd_namespace != NULL)
@@ -3081,7 +3150,6 @@ static void filter_revimp_update(struct obd_export *exp)
 static int filter_ping(struct obd_export *exp)
 {
         filter_fmd_expire(exp);
-
         return 0;
 }
 
@@ -3187,7 +3255,7 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
         unsigned int orig_ids[MAXQUOTAS] = {0, 0};
         struct llog_cookie *fcc = NULL;
         struct filter_obd *filter;
-        int rc, err, locked = 0, sync = 0;
+        int rc, err, sync = 0;
         loff_t old_size = 0;
         unsigned int ia_valid;
         struct inode *inode;
@@ -3210,14 +3278,22 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
                 if (fcc != NULL)
                         *fcc = oa->o_lcookie;
         }
-
-        if (ia_valid & ATTR_SIZE || ia_valid & (ATTR_UID | ATTR_GID)) {
-                old_size = i_size_read(inode);
+        if (ia_valid & (ATTR_SIZE | ATTR_UID | ATTR_GID)) {
                 DQUOT_INIT(inode);
+                /* Filter truncates and writes are serialized by
+                 * i_alloc_sem, see the comment in
+                 * filter_preprw_write.*/
+                if (ia_valid & ATTR_SIZE)
+                        down_write(&inode->i_alloc_sem);
                 LOCK_INODE_MUTEX(inode);
-                locked = 1;
+                old_size = i_size_read(inode);
         }
 
+        /* VBR: version recovery check */
+        rc = filter_version_get_check(exp, oti, inode);
+        if (rc)
+                GOTO(out_unlock, rc);
+
         /* If the inode still has SUID+SGID bits set (see filter_precreate())
          * then we will accept the UID+GID sent by the client during write for
          * initializing the ownership of this inode.  We only allow this to
@@ -3280,7 +3356,7 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
          * sure we have one left for the last_rcvd update. */
         err = fsfilt_extend(exp->exp_obd, inode, 1, handle);
 
-        rc = filter_finish_transno(exp, oti, rc, sync);
+        rc = filter_finish_transno(exp, inode, oti, rc, sync);
         if (sync) {
                 filter_cancel_cookies_cb(exp->exp_obd, 0, fcc, rc);
                 fcc = NULL;
@@ -3305,16 +3381,12 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
                         rc = err;
         }
 
-        if (locked) {
-                UNLOCK_INODE_MUTEX(inode);
-                locked = 0;
-        }
-
         EXIT;
 out_unlock:
-        if (locked)
+        if (ia_valid & (ATTR_SIZE | ATTR_UID | ATTR_GID))
                 UNLOCK_INODE_MUTEX(inode);
-
+        if (ia_valid & ATTR_SIZE)
+                up_write(&inode->i_alloc_sem);
         if (fcc)
                 OBD_FREE(fcc, sizeof(*fcc));
 
@@ -3482,11 +3554,12 @@ static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
 
 /* caller must hold fo_create_locks[oa->o_gr] */
 static int filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
-                                      struct filter_obd *filter)
+                                     struct filter_obd *filter)
 {
-        struct obdo doa; /* XXX obdo on stack */
+        struct obdo doa = { 0 }; /* XXX obdo on stack */
         obd_id last, id;
-        int rc;
+        int rc = 0;
+        int skip_orphan;
         ENTRY;
 
         LASSERT(oa);
@@ -3508,8 +3581,11 @@ static int filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
 
         last = filter_last_id(filter, doa.o_gr);
 
-        CWARN("%s: deleting orphan objects from "LPU64" to "LPU64"\n",
-               exp->exp_obd->obd_name, oa->o_id + 1, last);
+        skip_orphan = !!(exp->exp_connect_flags & OBD_CONNECT_SKIP_ORPHAN);
+
+        CDEBUG(D_HA, "%s: deleting orphan objects from "LPU64" to "LPU64"%s\n",
+               exp->exp_obd->obd_name, oa->o_id + 1, last,
+               skip_orphan ? ", orphan objids won't be reused any more." : ".");
 
         for (id = last; id > oa->o_id; id--) {
                 doa.o_id = id;
@@ -3517,17 +3593,26 @@ static int filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
                 if (rc && rc != -ENOENT) /* this is pretty fatal... */
                         CEMERG("error destroying precreate objid "LPU64": %d\n",
                                id, rc);
-                filter_set_last_id(filter, id - 1, doa.o_gr);
+
                 /* update last_id on disk periodically so that if we restart
                  * we don't need to re-scan all of the just-deleted objects. */
-                if ((id & 511) == 0)
+                if ((id & 511) == 0 && !skip_orphan) {
+                        filter_set_last_id(filter, id - 1, doa.o_gr);
                         filter_update_last_objid(exp->exp_obd, doa.o_gr, 0);
+                }
         }
 
         CDEBUG(D_HA, "%s: after destroy: set last_objids["LPU64"] = "LPU64"\n",
                exp->exp_obd->obd_name, doa.o_gr, oa->o_id);
 
-        rc = filter_update_last_objid(exp->exp_obd, doa.o_gr, 1);
+        if (!skip_orphan) {
+                filter_set_last_id(filter, id, doa.o_gr);
+                rc = filter_update_last_objid(exp->exp_obd, doa.o_gr, 1);
+        } else {
+                /* don't reuse orphan object, return last used objid */
+                oa->o_id = last;
+                rc = 0;
+        }
         clear_bit(doa.o_gr, &filter->fo_destroys_in_progress);
 
         RETURN(rc);
@@ -3546,6 +3631,8 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
 
         /* delete orphans request */
         if ((oa->o_valid & OBD_MD_FLFLAGS) && (oa->o_flags & OBD_FL_DELORPHAN)){
+                obd_id last = filter_last_id(filter, group);
+
                 if (oti->oti_conn_cnt < exp->exp_conn_cnt) {
                         CERROR("%s: dropping old orphan cleanup request\n",
                                obd->obd_name);
@@ -3560,14 +3647,14 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
                         up(&filter->fo_create_locks[group]);
                         RETURN(0);
                 }
-                diff = oa->o_id - filter_last_id(filter, group);
+                diff = oa->o_id - last;
                 CDEBUG(D_HA, "filter_last_id() = "LPU64" -> diff = %d\n",
-                       filter_last_id(filter, group), diff);
+                       last, diff);
 
                 if (-diff > OST_MAX_PRECREATE) {
                         CERROR("%s: ignoring bogus orphan destroy request: "
                                "obdid "LPU64" last_id "LPU64"\n", obd->obd_name,
-                               oa->o_id, filter_last_id(filter, group));
+                               oa->o_id, last);
                         /* FIXME: should reset precreate_next_id on MDS */
                         GOTO(out, rc = -EINVAL);
                 }
@@ -3647,7 +3734,7 @@ static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
          * stop creating files on MDS if OST is not good shape to create
          * objects.*/
         osfs->os_state = (filter->fo_obt.obt_sb->s_flags & MS_RDONLY) ?
-                EROFS : 0;
+                OS_STATE_READONLY : 0;
         RETURN(rc);
 }
 
@@ -3675,6 +3762,19 @@ static int filter_use_existing_obj(struct obd_device *obd,
         return rc;
 }
 
+static __u64 filter_calc_free_inodes(struct obd_device *obd)
+{
+        int rc;
+        __u64 os_ffree = -1;
+
+        spin_lock(&obd->obd_osfs_lock);
+        rc = fsfilt_statfs(obd, obd->u.obt.obt_sb, cfs_time_shift_64(1));
+        if (rc == 0)
+                os_ffree = obd->obd_osfs.os_ffree;
+        spin_unlock(&obd->obd_osfs_lock);
+
+        return os_ffree;
+}
 
 /* We rely on the fact that only one thread will be creating files in a given
  * group at a time, which is why we don't need an atomic filter_get_new_id.
@@ -3695,6 +3795,7 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
         struct obd_statfs *osfs;
         int err = 0, rc = 0, recreate_obj = 0, i;
         cfs_time_t enough_time = cfs_time_shift(DISK_TIMEOUT/2);
+        __u64 os_ffree;
         obd_id next_id;
         void *handle = NULL;
         ENTRY;
@@ -3807,9 +3908,19 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                                    S_IFREG |  S_ISUID | S_ISGID | 0666, NULL);
                 if (rc) {
                         CERROR("create failed rc = %d\n", rc);
+                        if (rc == -ENOSPC) {
+                                os_ffree = filter_calc_free_inodes(obd);
+                                if (os_ffree != -1)
+                                        CERROR("%s: free inode "LPU64"\n",
+                                               obd->obd_name, os_ffree);
+                        }
                         GOTO(cleanup, rc);
                 }
 
+                if (dchild->d_inode)
+                        CDEBUG(D_INFO, "objid "LPU64" got inum %lu\n", next_id,
+                                       dchild->d_inode->i_ino);
+
 set_last_id:
                 if (!recreate_obj) {
                         filter_set_last_id(filter, next_id, group);
@@ -3938,6 +4049,7 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
         struct obd_device *obd;
         struct filter_obd *filter;
         struct dentry *dchild = NULL, *dparent = NULL;
+        struct lustre_handle lockh = { 0 };
         struct lvfs_run_ctxt saved;
         void *handle = NULL;
         struct llog_cookie *fcc = NULL;
@@ -3990,7 +4102,7 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
                 GOTO(cleanup, rc = -ENOENT);
         }
 
-        filter_prepare_destroy(obd, oa->o_id, oa->o_gr);
+        filter_prepare_destroy(obd, oa->o_id, oa->o_gr, &lockh);
 
         /* Our MDC connection is established by the MDS to us */
         if (oa->o_valid & OBD_MD_FLCOOKIE) {
@@ -4008,6 +4120,12 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
          * (see BUG 4180) -bzzz
          */
         LOCK_INODE_MUTEX(dchild->d_inode);
+
+        /* VBR: version recovery check */
+        rc = filter_version_get_check(exp, oti, dchild->d_inode);
+        if (rc)
+                GOTO(cleanup, rc);
+
         handle = fsfilt_start_log(obd, dchild->d_inode, FSFILT_OP_SETATTR,
                                   NULL, 1);
         if (IS_ERR(handle)) {
@@ -4064,7 +4182,7 @@ cleanup:
                  * on commit. then we call callback directly to free
                  * the fcc.
                  */
-                rc = filter_finish_transno(exp, oti, rc, sync);
+                rc = filter_finish_transno(exp, NULL, oti, rc, sync);
                 if (sync) {
                         filter_cancel_cookies_cb(obd, 0, fcc, rc);
                         fcc = NULL;
@@ -4080,6 +4198,8 @@ cleanup:
         case 3:
                 filter_parent_unlock(dparent);
         case 2:
+                filter_fini_destroy(obd, &lockh);
+
                 f_dput(dchild);
                 if (fcc != NULL)
                         OBD_FREE(fcc, sizeof(*fcc));
@@ -4252,14 +4372,10 @@ static int filter_get_info(struct obd_export *exp, __u32 keylen,
                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
                 rc = fsfilt_iocontrol(obd, dentry->d_inode, NULL,
                                       EXT3_IOC_FIEMAP, (long)fiemap);
-                if (rc) {
-                        f_dput(dentry);
-                        RETURN(rc);
-                }
                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 
                 f_dput(dentry);
-                RETURN(0);
+                RETURN(rc);
         }
 
         CDEBUG(D_IOCTL, "invalid key\n");
@@ -4287,12 +4403,61 @@ static inline int filter_setup_llog_group(struct obd_export *exp,
         llog_ctxt_put(ctxt);
         return rc;
 }
+
+static int filter_set_grant_shrink(struct obd_export *exp,
+                                   struct ost_body *body)
+{
+        /* handle shrink grant */
+        spin_lock(&exp->exp_obd->obd_osfs_lock);
+        filter_grant_incoming(exp, &body->oa);
+        spin_unlock(&exp->exp_obd->obd_osfs_lock);
+
+        RETURN(0);
+
+}
+
+static int filter_set_mds_conn(struct obd_export *exp, void *val)
+{
+        struct obd_device *obd;
+        int rc = 0, group;
+        ENTRY;
+
+        obd = exp->exp_obd;
+        if (obd == NULL) {
+                CDEBUG(D_IOCTL, "invalid export %p\n", exp);
+                RETURN(-EINVAL);
+        }
+
+        LCONSOLE_WARN("%s: received MDS connection from %s\n", obd->obd_name,
+                      obd_export_nid2str(exp));
+        obd->u.filter.fo_mdc_conn.cookie = exp->exp_handle.h_cookie;
+
+        /* setup llog imports */
+        if (val != NULL)
+                group = (int)(*(__u32 *)val);
+        else
+                group = 0; /* default value */
+
+        LASSERT_MDS_GROUP(group);
+        rc = filter_setup_llog_group(exp, obd, group);
+        if (rc)
+                goto out;
+
+        if (group == FILTER_GROUP_MDS0) {
+                /* setup llog group 1 for interop */
+                filter_setup_llog_group(exp, obd, FILTER_GROUP_LLOG);
+        }
+
+        lquota_setinfo(filter_quota_interface_ref, obd, exp);
+out:
+        RETURN(rc);
+}
+
 static int filter_set_info_async(struct obd_export *exp, __u32 keylen,
                                  void *key, __u32 vallen, void *val,
                                  struct ptlrpc_request_set *set)
 {
         struct obd_device *obd;
-        int rc = 0, group;
         ENTRY;
 
         obd = exp->exp_obd;
@@ -4302,6 +4467,7 @@ static int filter_set_info_async(struct obd_export *exp, __u32 keylen,
         }
 
         if (KEY_IS(KEY_CAPA_KEY)) {
+                int rc;
                 rc = filter_update_capa_key(obd, (struct lustre_capa_key *)val);
                 if (rc)
                         CERROR("filter update capability key failed: %d\n", rc);
@@ -4319,30 +4485,13 @@ static int filter_set_info_async(struct obd_export *exp, __u32 keylen,
                 RETURN(0);
         }
 
-        if (!KEY_IS(KEY_MDS_CONN))
-                RETURN(-EINVAL);
+        if (KEY_IS(KEY_MDS_CONN))
+                RETURN(filter_set_mds_conn(exp, val));
 
-        LCONSOLE_WARN("%s: received MDS connection from %s\n", obd->obd_name,
-                      obd_export_nid2str(exp));
-        obd->u.filter.fo_mdc_conn.cookie = exp->exp_handle.h_cookie;
-
-        /* setup llog imports */
-        LASSERT(val != NULL);
-
-        group = (int)(*(__u32 *)val);
-        LASSERT_MDS_GROUP(group);
-        rc = filter_setup_llog_group(exp, obd, group);
-        if (rc)
-                goto out;
+        if (KEY_IS(KEY_GRANT_SHRINK))
+                RETURN(filter_set_grant_shrink(exp, val));
 
-        lquota_setinfo(filter_quota_interface_ref, obd, exp);
-
-        if (group == FILTER_GROUP_MDS0) {
-                /* setup llog group 1 for interop */
-                filter_setup_llog_group(exp, obd, FILTER_GROUP_LLOG);
-        }
-out:
-        RETURN(rc);
+        RETURN(-EINVAL);
 }
 
 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
@@ -4354,7 +4503,7 @@ int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
 
         switch (cmd) {
         case OBD_IOC_ABORT_RECOVERY: {
-                CERROR("aborting recovery for device %s\n", obd->obd_name);
+                LCONSOLE_WARN("%s: Aborting recovery.\n", obd->obd_name);
                 target_stop_recovery_thread(obd);
                 RETURN(0);
         }
@@ -4453,8 +4602,8 @@ static int filter_process_config(struct obd_device *obd, obd_count len,
 
                 rc = class_process_proc_param(PARAM_OST, lvars.obd_vars,
                                               lcfg, obd);
-               if (rc > 0)
-                       rc = 0;
+                if (rc > 0)
+                        rc = 0;
                 break;
         }