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b=21871 Just cleanup export nid_stat while exp_refcount == 0.
[fs/lustre-release.git] / lustre / obdfilter / filter.c
index 6540e24..3570a30 100644 (file)
@@ -26,7 +26,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  */
 /*
 
 #include "filter_internal.h"
 
-/* Group 0 is no longer a legal group, to catch uninitialized IDs */
-#define FILTER_MIN_GROUPS FILTER_GROUP_MDS0
 static struct lvfs_callback_ops filter_lvfs_ops;
 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);
+        class_export_cb_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);
+                cfs_spin_lock(&exp->exp_lock);
+                exp->exp_vbr_failed = 1;
+                cfs_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;
-        struct lsd_client_data *lcd = fed->fed_lcd;
+        struct obd_device_target *obt = &exp->exp_obd->u.obt;
+        struct tg_export_data *ted = &exp->exp_target_data;
+        struct lr_server_data *lsd = class_server_data(exp->exp_obd);
+        struct lsd_client_data *lcd;
         __u64 last_rcvd;
         loff_t off;
         int err, log_pri = D_RPCTRACE;
@@ -108,44 +135,58 @@ int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
         if (!exp->exp_obd->obd_replayable || oti == NULL)
                 RETURN(rc);
 
+        cfs_mutex_down(&ted->ted_lcd_lock);
+        lcd = ted->ted_lcd;
+        /* if the export has already been disconnected, we have no last_rcvd slot,
+         * update server data with latest transno then */
+        if (lcd == NULL) {
+                cfs_mutex_up(&ted->ted_lcd_lock);
+                CWARN("commit transaction for disconnected client %s: rc %d\n",
+                      exp->exp_client_uuid.uuid, rc);
+                err = filter_update_server_data(exp->exp_obd);
+                RETURN(err);
+        }
+
         /* we don't allocate new transnos for replayed requests */
+        cfs_spin_lock(&obt->obt_lut->lut_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;
+                last_rcvd = le64_to_cpu(lsd->lsd_last_transno) + 1;
+                lsd->lsd_last_transno = cpu_to_le64(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);
-                spin_unlock(&filter->fo_translock);
+                if (last_rcvd > le64_to_cpu(lsd->lsd_last_transno))
+                        lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
         }
+        oti->oti_transno = last_rcvd;
+
+        LASSERT(last_rcvd >= le64_to_cpu(lcd->lcd_last_transno));
         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);
+        cfs_spin_unlock(&obt->obt_lut->lut_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;
+        off = ted->ted_lr_off;
         if (off <= 0) {
                 CERROR("%s: client idx %d is %lld\n", exp->exp_obd->obd_name,
-                       fed->fed_lr_idx, fed->fed_lr_off);
+                       ted->ted_lr_idx, ted->ted_lr_off);
                 err = -EINVAL;
         } else {
+                class_export_cb_get(exp); /* released when the cb is called */
                 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,
+                err = fsfilt_write_record(exp->exp_obd, obt->obt_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;
@@ -154,8 +195,8 @@ int filter_finish_transno(struct obd_export *exp, struct obd_trans_info *oti,
         }
 
         CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
-               last_rcvd, lcd->lcd_uuid, fed->fed_lr_idx, err);
-
+               last_rcvd, lcd->lcd_uuid, ted->ted_lr_idx, err);
+        cfs_mutex_up(&ted->ted_lcd_lock);
         RETURN(rc);
 }
 
@@ -173,7 +214,7 @@ static void init_brw_stats(struct brw_stats *brw_stats)
 {
         int i;
         for (i = 0; i < BRW_LAST; i++)
-                spin_lock_init(&brw_stats->hist[i].oh_lock);
+                cfs_spin_lock_init(&brw_stats->hist[i].oh_lock);
 }
 
 static int lprocfs_init_rw_stats(struct obd_device *obd,
@@ -183,7 +224,7 @@ 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;
 
@@ -200,21 +241,24 @@ static int lprocfs_init_rw_stats(struct obd_device *obd,
    plus the procfs overhead :( */
 static int filter_export_stats_init(struct obd_device *obd,
                                     struct obd_export *exp,
+                                    int reconnect,
                                     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);
 
-        rc = lprocfs_exp_setup(exp, client_nid, &newnid);
-        if (rc)
+        rc = lprocfs_exp_setup(exp, client_nid, reconnect, &newnid);
+        if (rc) {
+                /* Mask error for already created
+                 * /proc entries */
+                if (rc == -EALREADY)
+                        rc = 0;
                 RETURN(rc);
+        }
 
         if (newnid) {
                 struct nid_stat *tmp = exp->exp_nid_stats;
@@ -222,7 +266,7 @@ static int filter_export_stats_init(struct obd_device *obd,
 
                 OBD_ALLOC(tmp->nid_brw_stats, sizeof(struct brw_stats));
                 if (tmp->nid_brw_stats == NULL)
-                        RETURN(-ENOMEM);
+                        GOTO(clean, rc = -ENOMEM);
 
                 init_brw_stats(tmp->nid_brw_stats);
                 rc = lprocfs_seq_create(exp->exp_nid_stats->nid_proc, "brw_stats",
@@ -233,15 +277,20 @@ static int filter_export_stats_init(struct obd_device *obd,
 
                 rc = lprocfs_init_rw_stats(obd, &exp->exp_nid_stats->nid_stats);
                 if (rc)
-                        RETURN(rc);
+                        GOTO(clean, rc);
 
                 rc = lprocfs_register_stats(tmp->nid_proc, "stats",
                                             tmp->nid_stats);
                 if (rc)
-                        RETURN(rc);
+                        GOTO(clean, rc);
+                rc = lprocfs_nid_ldlm_stats_init(tmp);
+                if (rc)
+                        GOTO(clean, rc);
         }
 
         RETURN(0);
+ clean:
+        return rc;
 }
 
 /* Add client data to the FILTER.  We use a bitmap to locate a free space
@@ -251,9 +300,10 @@ static int filter_export_stats_init(struct obd_device *obd,
 static int filter_client_add(struct obd_device *obd, struct obd_export *exp,
                              int cl_idx)
 {
-        struct filter_obd *filter = &obd->u.filter;
-        struct filter_export_data *fed = &exp->exp_filter_data;
-        unsigned long *bitmap = filter->fo_last_rcvd_slots;
+        struct obd_device_target *obt = &obd->u.obt;
+        struct tg_export_data *ted = &exp->exp_target_data;
+        struct lr_server_data *lsd = class_server_data(obd);
+        unsigned long *bitmap = obt->obt_lut->lut_client_bitmap;
         int new_client = (cl_idx == -1);
 
         ENTRY;
@@ -262,157 +312,151 @@ static int filter_client_add(struct obd_device *obd, struct obd_export *exp,
         LASSERTF(cl_idx > -2, "%d\n", cl_idx);
 
         /* Self-export */
-        if (strcmp(fed->fed_lcd->lcd_uuid, obd->obd_uuid.uuid) == 0)
+        if (strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid) == 0)
                 RETURN(0);
 
         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
          * there's no need for extra complication here
          */
         if (new_client) {
-                cl_idx = find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
+                cl_idx = cfs_find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
         repeat:
                 if (cl_idx >= LR_MAX_CLIENTS) {
                         CERROR("no room for %u client - fix LR_MAX_CLIENTS\n",
                                cl_idx);
                         RETURN(-EOVERFLOW);
                 }
-                if (test_and_set_bit(cl_idx, bitmap)) {
-                        cl_idx = find_next_zero_bit(bitmap, LR_MAX_CLIENTS,
-                                                    cl_idx);
+                if (cfs_test_and_set_bit(cl_idx, bitmap)) {
+                        cl_idx = cfs_find_next_zero_bit(bitmap, LR_MAX_CLIENTS,
+                                                        cl_idx);
                         goto repeat;
                 }
         } else {
-                if (test_and_set_bit(cl_idx, bitmap)) {
+                if (cfs_test_and_set_bit(cl_idx, bitmap)) {
                         CERROR("FILTER client %d: bit already set in bitmap!\n",
                                cl_idx);
                         LBUG();
                 }
         }
 
-        fed->fed_lr_idx = cl_idx;
-        fed->fed_lr_off = le32_to_cpu(filter->fo_fsd->lsd_client_start) +
-                cl_idx * le16_to_cpu(filter->fo_fsd->lsd_client_size);
-        LASSERTF(fed->fed_lr_off > 0, "fed_lr_off = %llu\n", fed->fed_lr_off);
+        ted->ted_lr_idx = cl_idx;
+        ted->ted_lr_off = le32_to_cpu(lsd->lsd_client_start) +
+                          cl_idx * le16_to_cpu(lsd->lsd_client_size);
+        cfs_init_mutex(&ted->ted_lcd_lock);
+        LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 
         CDEBUG(D_INFO, "client at index %d (%llu) with UUID '%s' added\n",
-               fed->fed_lr_idx, fed->fed_lr_off, fed->fed_lcd->lcd_uuid);
+               ted->ted_lr_idx, ted->ted_lr_off, ted->ted_lcd->lcd_uuid);
 
         if (new_client) {
                 struct lvfs_run_ctxt saved;
-                loff_t off = fed->fed_lr_off;
+                loff_t off = ted->ted_lr_off;
                 int rc;
                 void *handle;
 
                 CDEBUG(D_INFO, "writing client lcd at idx %u (%llu) (len %u)\n",
-                       fed->fed_lr_idx,off,(unsigned int)sizeof(*fed->fed_lcd));
+                       ted->ted_lr_idx,off,(unsigned int)sizeof(*ted->ted_lcd));
+
+                if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
+                        RETURN(-ENOSPC);
 
                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
                 /* Transaction needed to fix bug 1403 */
                 handle = fsfilt_start(obd,
-                                      filter->fo_rcvd_filp->f_dentry->d_inode,
+                                      obt->obt_rcvd_filp->f_dentry->d_inode,
                                       FSFILT_OP_SETATTR, NULL);
                 if (IS_ERR(handle)) {
                         rc = PTR_ERR(handle);
                         CERROR("unable to start transaction: rc %d\n", rc);
                 } else {
+                        ted->ted_lcd->lcd_last_epoch = lsd->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);
+                                                   target_client_add_cb,
+                                                   class_export_cb_get(exp));
                         if (rc == 0) {
-                                spin_lock(&exp->exp_lock);
+                                cfs_spin_lock(&exp->exp_lock);
                                 exp->exp_need_sync = 1;
-                                spin_unlock(&exp->exp_lock);
+                                cfs_spin_unlock(&exp->exp_lock);
                         }
-                        rc = fsfilt_write_record(obd, filter->fo_rcvd_filp,
-                                                 fed->fed_lcd,
-                                                 sizeof(*fed->fed_lcd),
+                        rc = fsfilt_write_record(obd, obt->obt_rcvd_filp,
+                                                 ted->ted_lcd,
+                                                 sizeof(*ted->ted_lcd),
                                                  &off, rc /* sync if no cb */);
                         fsfilt_commit(obd,
-                                      filter->fo_rcvd_filp->f_dentry->d_inode,
+                                      obt->obt_rcvd_filp->f_dentry->d_inode,
                                       handle, 0);
                 }
                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 
                 if (rc) {
                         CERROR("error writing %s client idx %u: rc %d\n",
-                               LAST_RCVD, fed->fed_lr_idx, rc);
+                               LAST_RCVD, ted->ted_lr_idx, rc);
                         RETURN(rc);
                 }
         }
         RETURN(0);
 }
 
-static int filter_client_free(struct obd_export *exp)
+static int filter_client_del(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 tg_export_data *ted = &exp->exp_target_data;
+        struct obd_device_target *obt = &exp->exp_obd->u.obt;
         struct lvfs_run_ctxt saved;
         int rc;
         loff_t off;
         ENTRY;
 
-        if (fed->fed_lcd == NULL)
+        if (ted->ted_lcd == NULL)
                 RETURN(0);
 
         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
-        if (strcmp(fed->fed_lcd->lcd_uuid, obd->obd_uuid.uuid ) == 0)
+        if (strcmp(ted->ted_lcd->lcd_uuid, exp->exp_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(obt->obt_lut->lut_client_bitmap != NULL);
 
-        LASSERT(filter->fo_last_rcvd_slots != NULL);
+        off = ted->ted_lr_off;
 
-        off = fed->fed_lr_off;
+        CDEBUG(D_INFO, "freeing client at idx %u, offset %lld with UUID '%s'\n",
+               ted->ted_lr_idx, ted->ted_lr_off, ted->ted_lcd->lcd_uuid);
 
-        /* Don't clear fed_lr_idx here as it is likely also unset.  At worst
+        /* Don't clear ted_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) {
                 CERROR("%s: client idx %d has med_off %lld\n",
-                       obd->obd_name, fed->fed_lr_idx, off);
+                       exp->exp_obd->obd_name, ted->ted_lr_idx, off);
                 GOTO(free, rc = -EINVAL);
         }
 
         /* Clear the bit _after_ zeroing out the client so we don't
            race with filter_client_add and zero out new clients.*/
-        if (!test_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
+        if (!cfs_test_bit(ted->ted_lr_idx, obt->obt_lut->lut_client_bitmap)) {
                 CERROR("FILTER client %u: bit already clear in bitmap!!\n",
-                       fed->fed_lr_idx);
+                       ted->ted_lr_idx);
                 LBUG();
         }
 
-        if (!(exp->exp_flags & OBD_OPT_FAILOVER)) {
-                memset(&zero_lcd, 0, sizeof zero_lcd);
-                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));
-                if (rc == 0)
-                        /* update server's transno */
-                        filter_update_server_data(obd, filter->fo_rcvd_filp,
-                                                  filter->fo_fsd,
-                                                  !exp->exp_libclient);
-                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",
-                       fed->fed_lcd->lcd_uuid, fed->fed_lr_idx, fed->fed_lr_off,
-                       LAST_RCVD, rc);
-        }
-
-        if (!test_and_clear_bit(fed->fed_lr_idx, filter->fo_last_rcvd_slots)) {
-                CERROR("FILTER client %u: bit already clear in bitmap!!\n",
-                       fed->fed_lr_idx);
-                LBUG();
-        }
+        push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+        /* Make sure the server's last_transno is up to date.
+         * This should be done before zeroing client slot so last_transno will
+         * be in server data or in client data in case of failure */
+        filter_update_server_data(exp->exp_obd);
+
+        cfs_mutex_down(&ted->ted_lcd_lock);
+        memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
+        rc = fsfilt_write_record(exp->exp_obd, obt->obt_rcvd_filp,
+                                 ted->ted_lcd,
+                                 sizeof(*ted->ted_lcd), &off, 0);
+        cfs_mutex_up(&ted->ted_lcd_lock);
+        pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
 
+        CDEBUG(rc == 0 ? D_INFO : D_ERROR,
+               "zero out client %s at idx %u/%llu in %s, rc %d\n",
+               ted->ted_lcd->lcd_uuid, ted->ted_lr_idx, ted->ted_lr_off,
+               LAST_RCVD, rc);
         EXIT;
 free:
-        OBD_FREE_PTR(fed->fed_lcd);
-        fed->fed_lcd = NULL;
-
         return 0;
 }
 
@@ -425,7 +469,7 @@ static inline void filter_fmd_put_nolock(struct filter_export_data *fed,
                 /* XXX when we have persistent reservations and the handle
                  * is stored herein we need to drop it here. */
                 fed->fed_mod_count--;
-                list_del(&fmd->fmd_list);
+                cfs_list_del(&fmd->fmd_list);
                 OBD_SLAB_FREE(fmd, ll_fmd_cachep, sizeof(*fmd));
         }
 }
@@ -439,9 +483,9 @@ void filter_fmd_put(struct obd_export *exp, struct filter_mod_data *fmd)
                 return;
 
         fed = &exp->exp_filter_data;
-        spin_lock(&fed->fed_lock);
+        cfs_spin_lock(&fed->fed_lock);
         filter_fmd_put_nolock(fed, fmd); /* caller reference */
-        spin_unlock(&fed->fed_lock);
+        cfs_spin_unlock(&fed->fed_lock);
 }
 
 /* expire entries from the end of the list if there are too many
@@ -452,42 +496,42 @@ static void filter_fmd_expire_nolock(struct filter_obd *filter,
 {
         struct filter_mod_data *fmd, *tmp;
 
-        list_for_each_entry_safe(fmd, tmp, &fed->fed_mod_list, fmd_list) {
+        cfs_list_for_each_entry_safe(fmd, tmp, &fed->fed_mod_list, fmd_list) {
                 if (fmd == keep)
                         break;
 
-                if (time_before(jiffies, fmd->fmd_expire) &&
+                if (cfs_time_before(jiffies, fmd->fmd_expire) &&
                     fed->fed_mod_count < filter->fo_fmd_max_num)
                         break;
 
-                list_del_init(&fmd->fmd_list);
+                cfs_list_del_init(&fmd->fmd_list);
                 filter_fmd_put_nolock(fed, fmd); /* list reference */
         }
 }
 
 void filter_fmd_expire(struct obd_export *exp)
 {
-        spin_lock(&exp->exp_filter_data.fed_lock);
+        cfs_spin_lock(&exp->exp_filter_data.fed_lock);
         filter_fmd_expire_nolock(&exp->exp_obd->u.filter,
                                  &exp->exp_filter_data, NULL);
-        spin_unlock(&exp->exp_filter_data.fed_lock);
+        cfs_spin_unlock(&exp->exp_filter_data.fed_lock);
 }
 
 /* find specified objid, group in export fmd list.
  * caller must hold fed_lock and take fmd reference itself */
 static struct filter_mod_data *filter_fmd_find_nolock(struct filter_obd *filter,
                                                 struct filter_export_data *fed,
-                                                obd_id objid, obd_gr group)
+                                                obd_id objid, obd_seq group)
 {
         struct filter_mod_data *found = NULL, *fmd;
 
         LASSERT_SPIN_LOCKED(&fed->fed_lock);
 
-        list_for_each_entry_reverse(fmd, &fed->fed_mod_list, fmd_list) {
+        cfs_list_for_each_entry_reverse(fmd, &fed->fed_mod_list, fmd_list) {
                 if (fmd->fmd_id == objid && fmd->fmd_gr == group) {
                         found = fmd;
-                        list_del(&fmd->fmd_list);
-                        list_add_tail(&fmd->fmd_list, &fed->fed_mod_list);
+                        cfs_list_del(&fmd->fmd_list);
+                        cfs_list_add_tail(&fmd->fmd_list, &fed->fed_mod_list);
                         fmd->fmd_expire = jiffies + filter->fo_fmd_max_age;
                         break;
                 }
@@ -500,16 +544,16 @@ static struct filter_mod_data *filter_fmd_find_nolock(struct filter_obd *filter,
 
 /* Find fmd based on objid and group, or return NULL if not found. */
 struct filter_mod_data *filter_fmd_find(struct obd_export *exp,
-                                        obd_id objid, obd_gr group)
+                                        obd_id objid, obd_seq group)
 {
         struct filter_mod_data *fmd;
 
-        spin_lock(&exp->exp_filter_data.fed_lock);
+        cfs_spin_lock(&exp->exp_filter_data.fed_lock);
         fmd = filter_fmd_find_nolock(&exp->exp_obd->u.filter,
                                      &exp->exp_filter_data, objid, group);
         if (fmd)
                 fmd->fmd_refcount++;    /* caller reference */
-        spin_unlock(&exp->exp_filter_data.fed_lock);
+        cfs_spin_unlock(&exp->exp_filter_data.fed_lock);
 
         return fmd;
 }
@@ -520,18 +564,19 @@ struct filter_mod_data *filter_fmd_find(struct obd_export *exp,
  * Currently this is not fatal because any fmd state is transient and
  * may also be freed when it gets sufficiently old. */
 struct filter_mod_data *filter_fmd_get(struct obd_export *exp,
-                                       obd_id objid, obd_gr group)
+                                       obd_id objid, obd_seq group)
 {
         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);
+        cfs_spin_lock(&fed->fed_lock);
         found = filter_fmd_find_nolock(&exp->exp_obd->u.filter,fed,objid,group);
         if (fmd_new) {
                 if (found == NULL) {
-                        list_add_tail(&fmd_new->fmd_list, &fed->fed_mod_list);
+                        cfs_list_add_tail(&fmd_new->fmd_list,
+                                          &fed->fed_mod_list);
                         fmd_new->fmd_id = objid;
                         fmd_new->fmd_gr = group;
                         fmd_new->fmd_refcount++;   /* list reference */
@@ -547,7 +592,7 @@ struct filter_mod_data *filter_fmd_get(struct obd_export *exp,
                         exp->exp_obd->u.filter.fo_fmd_max_age;
         }
 
-        spin_unlock(&fed->fed_lock);
+        cfs_spin_unlock(&fed->fed_lock);
 
         return found;
 }
@@ -557,17 +602,17 @@ struct filter_mod_data *filter_fmd_get(struct obd_export *exp,
  * This isn't so critical because it would in fact only affect the one client
  * that is doing the unlink and at worst we have an stale entry referencing
  * an object that should never be used again. */
-static void filter_fmd_drop(struct obd_export *exp, obd_id objid, obd_gr group)
+static void filter_fmd_drop(struct obd_export *exp, obd_id objid, obd_seq group)
 {
         struct filter_mod_data *found = NULL;
 
-        spin_lock(&exp->exp_filter_data.fed_lock);
+        cfs_spin_lock(&exp->exp_filter_data.fed_lock);
         found = filter_fmd_find_nolock(&exp->exp_filter_data, objid, group);
         if (found) {
-                list_del_init(&found->fmd_list);
+                cfs_list_del_init(&found->fmd_list);
                 filter_fmd_put_nolock(&exp->exp_filter_data, found);
         }
-        spin_unlock(&exp->exp_filter_data.fed_lock);
+        cfs_spin_unlock(&exp->exp_filter_data.fed_lock);
 }
 #else
 #define filter_fmd_drop(exp, objid, group)
@@ -579,58 +624,60 @@ static void filter_fmd_cleanup(struct obd_export *exp)
         struct filter_export_data *fed = &exp->exp_filter_data;
         struct filter_mod_data *fmd = NULL, *tmp;
 
-        spin_lock(&fed->fed_lock);
-        list_for_each_entry_safe(fmd, tmp, &fed->fed_mod_list, fmd_list) {
-                list_del_init(&fmd->fmd_list);
+        cfs_spin_lock(&fed->fed_lock);
+        cfs_list_for_each_entry_safe(fmd, tmp, &fed->fed_mod_list, fmd_list) {
+                cfs_list_del_init(&fmd->fmd_list);
                 filter_fmd_put_nolock(fed, fmd);
         }
-        spin_unlock(&fed->fed_lock);
+        cfs_spin_unlock(&fed->fed_lock);
 }
 
 static int filter_init_export(struct obd_export *exp)
 {
-        spin_lock_init(&exp->exp_filter_data.fed_lock);
+        int rc;
+        cfs_spin_lock_init(&exp->exp_filter_data.fed_lock);
         CFS_INIT_LIST_HEAD(&exp->exp_filter_data.fed_mod_list);
 
-        spin_lock(&exp->exp_lock);
+        cfs_spin_lock(&exp->exp_lock);
         exp->exp_connecting = 1;
-        spin_unlock(&exp->exp_lock);
+        cfs_spin_unlock(&exp->exp_lock);
+        rc = lut_client_alloc(exp);
+        if (rc == 0)
+                rc = ldlm_init_export(exp);
 
-        return ldlm_init_export(exp);
+        return rc;
 }
 
-static int filter_free_server_data(struct filter_obd *filter)
+static int filter_free_server_data(struct obd_device_target *obt)
 {
-        OBD_FREE(filter->fo_fsd, sizeof(*filter->fo_fsd));
-        filter->fo_fsd = NULL;
-        OBD_FREE(filter->fo_last_rcvd_slots, LR_MAX_CLIENTS / 8);
-        filter->fo_last_rcvd_slots = NULL;
+        lut_fini(NULL, obt->obt_lut);
+        OBD_FREE_PTR(obt->obt_lut);
         return 0;
 }
 
 /* assumes caller is already in kernel ctxt */
-int filter_update_server_data(struct obd_device *obd, struct file *filp,
-                              struct lr_server_data *fsd, int force_sync)
+int filter_update_server_data(struct obd_device *obd)
 {
+        struct file *filp = obd->u.obt.obt_rcvd_filp;
+        struct lr_server_data *lsd = class_server_data(obd);
         loff_t off = 0;
         int rc;
         ENTRY;
 
-        CDEBUG(D_INODE, "server uuid      : %s\n", fsd->lsd_uuid);
+        CDEBUG(D_INODE, "server uuid      : %s\n", lsd->lsd_uuid);
         CDEBUG(D_INODE, "server last_rcvd : "LPU64"\n",
-               le64_to_cpu(fsd->lsd_last_transno));
+               le64_to_cpu(lsd->lsd_last_transno));
         CDEBUG(D_INODE, "server last_mount: "LPU64"\n",
-               le64_to_cpu(fsd->lsd_mount_count));
+               le64_to_cpu(lsd->lsd_mount_count));
 
-        fsd->lsd_compat14 = fsd->lsd_last_transno;
-        rc = fsfilt_write_record(obd, filp, fsd, sizeof(*fsd), &off, force_sync);
+        rc = fsfilt_write_record(obd, filp, lsd, sizeof(*lsd), &off, 0);
         if (rc)
                 CERROR("error writing lr_server_data: rc = %d\n", rc);
 
         RETURN(rc);
 }
 
-int filter_update_last_objid(struct obd_device *obd, obd_gr group,
+int filter_update_last_objid(struct obd_device *obd, obd_seq group,
                              int force_sync)
 {
         struct filter_obd *filter = &obd->u.filter;
@@ -640,19 +687,19 @@ int filter_update_last_objid(struct obd_device *obd, obd_gr group,
         ENTRY;
 
         if (filter->fo_last_objid_files[group] == NULL) {
-                CERROR("Object group "LPU64" not fully setup; not updating "
+                CERROR("Object seq "LPU64" not fully setup; not updating "
                        "last_objid\n", group);
                 RETURN(-EINVAL);
         }
 
-        CDEBUG(D_INODE, "%s: server last_objid for group "LPU64": "LPU64"\n",
-               obd->obd_name, group, filter->fo_last_objids[group]);
+        CDEBUG(D_INODE, "%s: server last_objid for "POSTID"\n",
+               obd->obd_name, filter->fo_last_objids[group], group);
 
         tmp = cpu_to_le64(filter->fo_last_objids[group]);
         rc = fsfilt_write_record(obd, filter->fo_last_objid_files[group],
                                  &tmp, sizeof(tmp), &off, force_sync);
         if (rc)
-                CERROR("error writing group "LPU64" last objid: rc = %d\n",
+                CERROR("error writing seq "LPU64" last objid: rc = %d\n",
                        group, rc);
         RETURN(rc);
 }
@@ -661,121 +708,129 @@ extern int ost_handle(struct ptlrpc_request *req);
 static int filter_init_server_data(struct obd_device *obd, struct file * filp)
 {
         struct filter_obd *filter = &obd->u.filter;
-        struct lr_server_data *fsd;
+        struct lr_server_data *lsd;
         struct lsd_client_data *lcd = NULL;
         struct inode *inode = filp->f_dentry->d_inode;
         unsigned long last_rcvd_size = i_size_read(inode);
+        struct lu_target *lut;
         __u64 mount_count;
+        __u32 start_epoch;
         int cl_idx;
         loff_t off = 0;
         int rc;
 
         /* ensure padding in the struct is the correct size */
         CLASSERT (offsetof(struct lr_server_data, lsd_padding) +
-                 sizeof(fsd->lsd_padding) == LR_SERVER_SIZE);
+                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
         CLASSERT (offsetof(struct lsd_client_data, lcd_padding) +
                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 
-        OBD_ALLOC(fsd, sizeof(*fsd));
-        if (!fsd)
+        /* allocate and initialize lu_target */
+        OBD_ALLOC_PTR(lut);
+        if (lut == NULL)
                 RETURN(-ENOMEM);
-        filter->fo_fsd = fsd;
-
-        OBD_ALLOC(filter->fo_last_rcvd_slots, LR_MAX_CLIENTS / 8);
-        if (filter->fo_last_rcvd_slots == NULL) {
-                OBD_FREE(fsd, sizeof(*fsd));
-                RETURN(-ENOMEM);
-        }
-
+        rc = lut_init(NULL, lut, obd, NULL);
+        if (rc)
+                GOTO(err_lut, rc);
+        lsd = class_server_data(obd);
         if (last_rcvd_size == 0) {
                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 
-                memcpy(fsd->lsd_uuid, obd->obd_uuid.uuid,sizeof(fsd->lsd_uuid));
-                fsd->lsd_last_transno = 0;
-                mount_count = fsd->lsd_mount_count = 0;
-                fsd->lsd_server_size = cpu_to_le32(LR_SERVER_SIZE);
-                fsd->lsd_client_start = cpu_to_le32(LR_CLIENT_START);
-                fsd->lsd_client_size = cpu_to_le16(LR_CLIENT_SIZE);
-                fsd->lsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
+                memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,sizeof(lsd->lsd_uuid));
+                lsd->lsd_last_transno = 0;
+                mount_count = lsd->lsd_mount_count = 0;
+                lsd->lsd_server_size = cpu_to_le32(LR_SERVER_SIZE);
+                lsd->lsd_client_start = cpu_to_le32(LR_CLIENT_START);
+                lsd->lsd_client_size = cpu_to_le16(LR_CLIENT_SIZE);
+                lsd->lsd_subdir_count = cpu_to_le16(FILTER_SUBDIR_COUNT);
                 filter->fo_subdir_count = FILTER_SUBDIR_COUNT;
-                fsd->lsd_feature_incompat = cpu_to_le32(OBD_INCOMPAT_OST);
+                /* OBD_COMPAT_OST is set in filter_connect_internal when the
+                 * MDS first connects and assigns the OST index number. */
+                lsd->lsd_feature_incompat = cpu_to_le32(OBD_INCOMPAT_COMMON_LR|
+                                                        OBD_INCOMPAT_OST);
         } else {
-                rc = fsfilt_read_record(obd, filp, fsd, sizeof(*fsd), &off);
+                rc = fsfilt_read_record(obd, filp, lsd, sizeof(*lsd), &off);
                 if (rc) {
                         CDEBUG(D_INODE,"OBD filter: error reading %s: rc %d\n",
                                LAST_RCVD, rc);
-                        GOTO(err_fsd, rc);
+                        GOTO(err_lut, rc);
                 }
-                if (strcmp(fsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
+                if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
                         LCONSOLE_ERROR_MSG(0x134, "Trying to start OBD %s "
                                            "using the wrong disk %s. Were the "
                                            "/dev/ assignments rearranged?\n",
-                                           obd->obd_uuid.uuid, fsd->lsd_uuid);
-                        GOTO(err_fsd, rc = -EINVAL);
+                                           obd->obd_uuid.uuid, lsd->lsd_uuid);
+                        GOTO(err_lut, rc = -EINVAL);
                 }
-                mount_count = le64_to_cpu(fsd->lsd_mount_count);
-                filter->fo_subdir_count = le16_to_cpu(fsd->lsd_subdir_count);
+                mount_count = le64_to_cpu(lsd->lsd_mount_count);
+                filter->fo_subdir_count = le16_to_cpu(lsd->lsd_subdir_count);
                 /* COMPAT_146 */
                 /* Assume old last_rcvd format unless I_C_LR is set */
-                if (!(fsd->lsd_feature_incompat &
+                if (!(lsd->lsd_feature_incompat &
                       cpu_to_le32(OBD_INCOMPAT_COMMON_LR)))
-                        fsd->lsd_last_transno = fsd->lsd_compat14;
+                        lsd->lsd_last_transno = lsd->lsd_compat14;
                 /* end COMPAT_146 */
+                /* OBD_COMPAT_OST is set in filter_connect_internal when the
+                 * MDS first connects and assigns the OST index number. */
+                lsd->lsd_feature_incompat |= cpu_to_le32(OBD_INCOMPAT_COMMON_LR|
+                                                         OBD_INCOMPAT_OST);
         }
 
-        if (fsd->lsd_feature_incompat & ~cpu_to_le32(FILTER_INCOMPAT_SUPP)) {
+        if (lsd->lsd_feature_incompat & ~cpu_to_le32(FILTER_INCOMPAT_SUPP)) {
                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
-                       obd->obd_name, le32_to_cpu(fsd->lsd_feature_incompat) &
+                       obd->obd_name, le32_to_cpu(lsd->lsd_feature_incompat) &
                        ~FILTER_INCOMPAT_SUPP);
-                GOTO(err_fsd, rc = -EINVAL);
+                GOTO(err_lut, rc = -EINVAL);
         }
-        if (fsd->lsd_feature_rocompat & ~cpu_to_le32(FILTER_ROCOMPAT_SUPP)) {
+        if (lsd->lsd_feature_rocompat & ~cpu_to_le32(FILTER_ROCOMPAT_SUPP)) {
                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
-                       obd->obd_name, le32_to_cpu(fsd->lsd_feature_rocompat) &
+                       obd->obd_name, le32_to_cpu(lsd->lsd_feature_rocompat) &
                        ~FILTER_ROCOMPAT_SUPP);
                 /* Do something like remount filesystem read-only */
-                GOTO(err_fsd, rc = -EINVAL);
+                GOTO(err_lut, rc = -EINVAL);
         }
 
-        CDEBUG(D_INODE, "%s: server last_transno : "LPU64"\n",
-               obd->obd_name, le64_to_cpu(fsd->lsd_last_transno));
+        start_epoch = le32_to_cpu(lsd->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(lsd->lsd_last_transno));
         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
                obd->obd_name, mount_count + 1);
         CDEBUG(D_INODE, "%s: server data size: %u\n",
-               obd->obd_name, le32_to_cpu(fsd->lsd_server_size));
+               obd->obd_name, le32_to_cpu(lsd->lsd_server_size));
         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
-               obd->obd_name, le32_to_cpu(fsd->lsd_client_start));
+               obd->obd_name, le32_to_cpu(lsd->lsd_client_start));
         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
-               obd->obd_name, le32_to_cpu(fsd->lsd_client_size));
+               obd->obd_name, le32_to_cpu(lsd->lsd_client_size));
         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
-               obd->obd_name, le16_to_cpu(fsd->lsd_subdir_count));
+               obd->obd_name, le16_to_cpu(lsd->lsd_subdir_count));
         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
-               last_rcvd_size <= le32_to_cpu(fsd->lsd_client_start) ? 0 :
-               (last_rcvd_size - le32_to_cpu(fsd->lsd_client_start)) /
-                le16_to_cpu(fsd->lsd_client_size));
+               last_rcvd_size <= le32_to_cpu(lsd->lsd_client_start) ? 0 :
+               (last_rcvd_size - le32_to_cpu(lsd->lsd_client_start)) /
+                le16_to_cpu(lsd->lsd_client_size));
 
         if (!obd->obd_replayable) {
                 CWARN("%s: recovery support OFF\n", obd->obd_name);
                 GOTO(out, rc = 0);
         }
 
-        for (cl_idx = 0, off = le32_to_cpu(fsd->lsd_client_start);
+        OBD_ALLOC_PTR(lcd);
+        if (!lcd)
+                GOTO(err_client, rc = -ENOMEM);
+
+        for (cl_idx = 0, off = le32_to_cpu(lsd->lsd_client_start);
              off < last_rcvd_size; cl_idx++) {
                 __u64 last_rcvd;
                 struct obd_export *exp;
                 struct filter_export_data *fed;
 
-                if (!lcd) {
-                        OBD_ALLOC_PTR(lcd);
-                        if (!lcd)
-                                GOTO(err_client, rc = -ENOMEM);
-                }
-
                 /* Don't assume off is incremented properly by
                  * fsfilt_read_record(), in case sizeof(*lcd)
-                 * isn't the same as fsd->lsd_client_size.  */
-                off = le32_to_cpu(fsd->lsd_client_start) +
-                        cl_idx * le16_to_cpu(fsd->lsd_client_size);
+                 * isn't the same as lsd->lsd_client_size.  */
+                off = le32_to_cpu(lsd->lsd_client_start) +
+                        cl_idx * le16_to_cpu(lsd->lsd_client_size);
                 rc = fsfilt_read_record(obd, filp, lcd, sizeof(*lcd), &off);
                 if (rc) {
                         CERROR("error reading FILT %s idx %d off %llu: rc %d\n",
@@ -789,73 +844,66 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
                         continue;
                 }
 
+                check_lcd(obd->obd_name, cl_idx, lcd);
+
                 last_rcvd = le64_to_cpu(lcd->lcd_last_transno);
 
+                CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
+                       " srv lr: "LPU64"\n", lcd->lcd_uuid, cl_idx,
+                       last_rcvd, le64_to_cpu(lsd->lsd_last_transno));
+
                 /* These exports are cleaned up by filter_disconnect(), so they
                  * need to be set up like real exports as filter_connect() does.
                  */
                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
-
-                CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
-                       " srv lr: "LPU64"\n", lcd->lcd_uuid, cl_idx,
-                       last_rcvd, le64_to_cpu(fsd->lsd_last_transno));
                 if (IS_ERR(exp)) {
                         if (PTR_ERR(exp) == -EALREADY) {
                                 /* export already exists, zero out this one */
-                                CERROR("Zeroing out duplicate export due to "
-                                       "bug 10479.\n");
-                                lcd->lcd_uuid[0] = '\0';
-                        } else {
-                                GOTO(err_client, rc = PTR_ERR(exp));
+                                CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
+                                continue;
                         }
-                } else {
-                        fed = &exp->exp_filter_data;
-                        fed->fed_lcd = lcd;
-                        fed->fed_group = 0; /* will be assigned at connect */
-                        filter_export_stats_init(obd, exp, NULL);
-                        rc = filter_client_add(obd, exp, cl_idx);
-                        /* can't fail for existing client */
-                        LASSERTF(rc == 0, "rc = %d\n", rc);
-
-                        lcd = NULL;
-                        spin_lock(&exp->exp_lock);
-                        exp->exp_connecting = 0;
-                        exp->exp_in_recovery = 0;
-                        spin_unlock(&exp->exp_lock);
-                        obd->obd_max_recoverable_clients++;
-                        class_export_put(exp);
+                        OBD_FREE_PTR(lcd);
+                        GOTO(err_client, rc = PTR_ERR(exp));
                 }
 
-                /* Need to check last_rcvd even for duplicated exports. */
-                CDEBUG(D_OTHER, "client at idx %d has last_rcvd = "LPU64"\n",
-                       cl_idx, last_rcvd);
+                fed = &exp->exp_filter_data;
+                *fed->fed_ted.ted_lcd = *lcd;
+                fed->fed_group = 0; /* will be assigned at connect */
+                filter_export_stats_init(obd, exp, 0, NULL);
+                rc = filter_client_add(obd, exp, cl_idx);
+                /* can't fail for existing client */
+                LASSERTF(rc == 0, "rc = %d\n", rc);
+
+                /* VBR: set export last committed */
+                exp->exp_last_committed = last_rcvd;
+                cfs_spin_lock(&exp->exp_lock);
+                exp->exp_connecting = 0;
+                exp->exp_in_recovery = 0;
+                cfs_spin_unlock(&exp->exp_lock);
+                obd->obd_max_recoverable_clients++;
+                class_export_put(exp);
 
-                if (last_rcvd > le64_to_cpu(fsd->lsd_last_transno))
-                        fsd->lsd_last_transno = cpu_to_le64(last_rcvd);
+                if (last_rcvd > le64_to_cpu(lsd->lsd_last_transno))
+                        lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
         }
+        OBD_FREE_PTR(lcd);
 
-        if (lcd)
-                OBD_FREE_PTR(lcd);
-
-        obd->obd_last_committed = le64_to_cpu(fsd->lsd_last_transno);
-
-        target_recovery_init(obd, ost_handle);
-
+        obd->obd_last_committed = le64_to_cpu(lsd->lsd_last_transno);
 out:
-        filter->fo_mount_count = mount_count + 1;
-        fsd->lsd_mount_count = cpu_to_le64(filter->fo_mount_count);
+        obd->u.obt.obt_mount_count = mount_count + 1;
+        lsd->lsd_mount_count = cpu_to_le64(obd->u.obt.obt_mount_count);
 
         /* save it, so mount count and last_transno is current */
-        rc = filter_update_server_data(obd, filp, filter->fo_fsd, 1);
+        rc = filter_update_server_data(obd);
         if (rc)
                 GOTO(err_client, rc);
 
         RETURN(0);
 
 err_client:
-        target_recovery_fini(obd);
-err_fsd:
-        filter_free_server_data(filter);
+        class_disconnect_exports(obd);
+err_lut:
+        filter_free_server_data(&obd->u.obt);
         RETURN(rc);
 }
 
@@ -939,7 +987,7 @@ static int filter_update_last_group(struct obd_device *obd, int group)
                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n",rc);
                 GOTO(cleanup, rc);
         }
-        LASSERT(off == 0 || last_group >= FILTER_MIN_GROUPS);
+
         CDEBUG(D_INODE, "%s: previous %d, new %d\n",
                obd->obd_name, last_group, group);
 
@@ -987,8 +1035,8 @@ static int filter_read_group_internal(struct obd_device *obd, int group,
                         RETURN(PTR_ERR(dentry));
                 }
         } else {
-                dentry = simple_mkdir(filter->fo_dentry_O, filter->fo_vfsmnt,
-                                      name, 0700, 1);
+                dentry = simple_mkdir(filter->fo_dentry_O,
+                                      obd->u.obt.obt_vfsmnt, name, 0700, 1);
                 if (IS_ERR(dentry)) {
                         CERROR("cannot lookup/create O/%s: rc = %ld\n", name,
                                PTR_ERR(dentry));
@@ -1012,7 +1060,7 @@ static int filter_read_group_internal(struct obd_device *obd, int group,
                 GOTO(cleanup, rc);
         }
 
-        if (filter->fo_subdir_count) {
+        if (filter->fo_subdir_count && fid_seq_is_mdt(group)) {
                 OBD_ALLOC(tmp_subdirs, sizeof(*tmp_subdirs));
                 if (tmp_subdirs == NULL)
                         GOTO(cleanup, rc = -ENOMEM);
@@ -1023,7 +1071,7 @@ static int filter_read_group_internal(struct obd_device *obd, int group,
                         snprintf(dir, sizeof(dir), "d%u", i);
 
                         tmp_subdirs->dentry[i] = simple_mkdir(dentry,
-                                                              filter->fo_vfsmnt,
+                                                              obd->u.obt.obt_vfsmnt,
                                                               dir, 0700, 1);
                         if (IS_ERR(tmp_subdirs->dentry[i])) {
                                 rc = PTR_ERR(tmp_subdirs->dentry[i]);
@@ -1076,7 +1124,7 @@ static int filter_read_group_internal(struct obd_device *obd, int group,
 
         filter->fo_dentry_O_groups[group] = dentry;
         filter->fo_last_objid_files[group] = filp;
-        if (filter->fo_subdir_count) {
+        if (filter->fo_subdir_count && fid_seq_is_mdt(group)) {
                 filter->fo_dentry_O_sub[group] = *tmp_subdirs;
                 OBD_FREE(tmp_subdirs, sizeof(*tmp_subdirs));
         }
@@ -1105,7 +1153,7 @@ static int filter_read_group_internal(struct obd_device *obd, int group,
                 if (new_files != NULL)
                         OBD_FREE(new_files, len * sizeof(*new_files));
         case 3:
-                if (filter->fo_subdir_count) {
+                if (filter->fo_subdir_count && fid_seq_is_mdt(group)) {
                         for (i = 0; i < filter->fo_subdir_count; i++) {
                                 if (tmp_subdirs->dentry[i] != NULL)
                                         dput(tmp_subdirs->dentry[i]);
@@ -1126,17 +1174,14 @@ static int filter_read_groups(struct obd_device *obd, int last_group,
         struct filter_obd *filter = &obd->u.filter;
         int old_count, group, rc = 0;
 
-        down(&filter->fo_init_lock);
+        cfs_down(&filter->fo_init_lock);
         old_count = filter->fo_group_count;
         for (group = old_count; group <= last_group; group++) {
-                if (group == 0)
-                        continue; /* no group zero */
-
                 rc = filter_read_group_internal(obd, group, create);
                 if (rc != 0)
                         break;
         }
-        up(&filter->fo_init_lock);
+        cfs_up(&filter->fo_init_lock);
         return rc;
 }
 
@@ -1144,13 +1189,13 @@ static int filter_read_groups(struct obd_device *obd, int last_group,
 static int filter_prep_groups(struct obd_device *obd)
 {
         struct filter_obd *filter = &obd->u.filter;
-        struct dentry *dentry, *O_dentry;
+        struct dentry *O_dentry;
         struct file *filp;
         int    last_group, rc = 0, cleanup_phase = 0;
         loff_t off = 0;
         ENTRY;
 
-        O_dentry = simple_mkdir(current->fs->pwd, filter->fo_vfsmnt,
+        O_dentry = simple_mkdir(current->fs->pwd, obd->u.obt.obt_vfsmnt,
                                 "O", 0700, 1);
         CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
         if (IS_ERR(O_dentry)) {
@@ -1161,57 +1206,6 @@ static int filter_prep_groups(struct obd_device *obd)
         filter->fo_dentry_O = O_dentry;
         cleanup_phase = 1; /* O_dentry */
 
-        /* Lookup "R" to tell if we're on an old OST FS and need to convert
-         * from O/R/<dir>/<objid> to O/0/<dir>/<objid>.  This can be removed
-         * some time post 1.0 when all old-style OSTs have converted along
-         * with the init_objid hack. */
-        dentry = ll_lookup_one_len("R", O_dentry, 1);
-        if (IS_ERR(dentry))
-                GOTO(cleanup, rc = PTR_ERR(dentry));
-        if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
-                struct dentry *O0_dentry = lookup_one_len("0", O_dentry, 1);
-                ENTRY;
-
-                CWARN("converting OST to new object layout\n");
-                if (IS_ERR(O0_dentry)) {
-                        rc = PTR_ERR(O0_dentry);
-                        CERROR("error looking up O/0: rc %d\n", rc);
-                        GOTO(cleanup_R, rc);
-                }
-
-                if (O0_dentry->d_inode) {
-                        CERROR("Both O/R and O/0 exist. Fix manually.\n");
-                        GOTO(cleanup_O0, rc = -EEXIST);
-                }
-
-                LOCK_INODE_MUTEX(O_dentry->d_inode);
-                rc = ll_vfs_rename(O_dentry->d_inode, dentry, filter->fo_vfsmnt,
-                                   O_dentry->d_inode, O0_dentry,
-                                   filter->fo_vfsmnt);
-                UNLOCK_INODE_MUTEX(O_dentry->d_inode);
-
-                if (rc) {
-                        CERROR("error renaming O/R to O/0: rc %d\n", rc);
-                        GOTO(cleanup_O0, rc);
-                }
-                filter->fo_fsd->lsd_feature_incompat |=
-                        cpu_to_le32(OBD_INCOMPAT_GROUPS);
-                rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
-                                               filter->fo_fsd, 1);
-                GOTO(cleanup_O0, rc);
-
-        cleanup_O0:
-                f_dput(O0_dentry);
-        cleanup_R:
-                f_dput(dentry);
-                if (rc)
-                        GOTO(cleanup, rc);
-        } else {
-                f_dput(dentry);
-        }
-
-        cleanup_phase = 2; /* groups */
-
         /* we have to initialize all groups before first connections from
          * clients because they may send create/destroy for any group -bzzz */
         filp = filp_open("LAST_GROUP", O_CREAT | O_RDWR, 0700);
@@ -1219,21 +1213,19 @@ static int filter_prep_groups(struct obd_device *obd)
                 CERROR("cannot create LAST_GROUP: rc = %ld\n", PTR_ERR(filp));
                 GOTO(cleanup, rc = PTR_ERR(filp));
         }
-        cleanup_phase = 3; /* filp */
+        cleanup_phase = 2; /* filp */
 
         rc = fsfilt_read_record(obd, filp, &last_group, sizeof(__u32), &off);
         if (rc) {
                 CDEBUG(D_INODE, "error reading LAST_GROUP: rc %d\n", rc);
                 GOTO(cleanup, rc);
         }
-        if (off == 0) {
-                last_group = FILTER_MIN_GROUPS;
-        } else {
-                LASSERT(last_group >= FILTER_MIN_GROUPS);
-        }
+
+        if (off == 0)
+                last_group = FID_SEQ_OST_MDT0;
 
         CWARN("%s: initialize groups [%d,%d]\n", obd->obd_name,
-              FILTER_MIN_GROUPS, last_group);
+              FID_SEQ_OST_MDT0, last_group);
         filter->fo_committed_group = last_group;
         rc = filter_read_groups(obd, last_group, 1);
         if (rc)
@@ -1244,11 +1236,10 @@ static int filter_prep_groups(struct obd_device *obd)
 
  cleanup:
         switch (cleanup_phase) {
-        case 3:
-                filp_close(filp, 0);
         case 2:
-                filter_cleanup_groups(obd);
+                filp_close(filp, 0);
         case 1:
+                filter_cleanup_groups(obd);
                 f_dput(filter->fo_dentry_O);
                 filter->fo_dentry_O = NULL;
         default:
@@ -1276,7 +1267,7 @@ static int filter_prep(struct obd_device *obd)
                        LAST_RCVD, rc);
                 GOTO(out, rc);
         }
-        filter->fo_rcvd_filp = file;
+        obd->u.obt.obt_rcvd_filp = file;
         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
                 CERROR("%s is not a regular file!: mode = %o\n", LAST_RCVD,
                        file->f_dentry->d_inode->i_mode);
@@ -1296,6 +1287,9 @@ static int filter_prep(struct obd_device *obd)
                 CERROR("cannot read %s: rc = %d\n", LAST_RCVD, rc);
                 GOTO(err_filp, rc);
         }
+        LASSERT(obd->u.obt.obt_lut);
+        target_recovery_init(obd->u.obt.obt_lut, ost_handle);
+
         /* open and create health check io file*/
         file = filp_open(HEALTH_CHECK, O_RDWR | O_CREAT, 0644);
         if (IS_ERR(file)) {
@@ -1304,7 +1298,7 @@ static int filter_prep(struct obd_device *obd)
                        HEALTH_CHECK, rc);
                 GOTO(err_server_data, rc);
         }
-        filter->fo_health_check_filp = file;
+        filter->fo_obt.obt_health_check_filp = file;
         if (!S_ISREG(file->f_dentry->d_inode->i_mode)) {
                 CERROR("%s is not a regular file!: mode = %o\n", HEALTH_CHECK,
                        file->f_dentry->d_inode->i_mode);
@@ -1323,16 +1317,16 @@ out:
         return(rc);
 
 err_health_check:
-        if (filp_close(filter->fo_health_check_filp, 0))
+        if (filp_close(filter->fo_obt.obt_health_check_filp, 0))
                 CERROR("can't close %s after error\n", HEALTH_CHECK);
-        filter->fo_health_check_filp = NULL;
+        filter->fo_obt.obt_health_check_filp = NULL;
 err_server_data:
         target_recovery_fini(obd);
-        filter_free_server_data(filter);
+        filter_free_server_data(&obd->u.obt);
 err_filp:
-        if (filp_close(filter->fo_rcvd_filp, 0))
+        if (filp_close(obd->u.obt.obt_rcvd_filp, 0))
                 CERROR("can't close %s after error\n", LAST_RCVD);
-        filter->fo_rcvd_filp = NULL;
+        obd->u.obt.obt_rcvd_filp = NULL;
         goto out;
 }
 
@@ -1348,12 +1342,11 @@ static void filter_post(struct obd_device *obd)
          * from lastobjid */
 
         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
-        rc = filter_update_server_data(obd, filter->fo_rcvd_filp,
-                                       filter->fo_fsd, 0);
+        rc = filter_update_server_data(obd);
         if (rc)
                 CERROR("error writing server data: rc = %d\n", rc);
 
-        for (i = 1; i < filter->fo_group_count; i++) {
+        for (i = 0; i < filter->fo_group_count; i++) {
                 rc = filter_update_last_objid(obd, i,
                                 (i == filter->fo_group_count - 1));
                 if (rc)
@@ -1361,18 +1354,18 @@ static void filter_post(struct obd_device *obd)
                                i, rc);
         }
 
-        rc = filp_close(filter->fo_rcvd_filp, 0);
-        filter->fo_rcvd_filp = NULL;
+        rc = filp_close(obd->u.obt.obt_rcvd_filp, 0);
+        obd->u.obt.obt_rcvd_filp = NULL;
         if (rc)
                 CERROR("error closing %s: rc = %d\n", LAST_RCVD, rc);
 
-        rc = filp_close(filter->fo_health_check_filp, 0);
-        filter->fo_health_check_filp = NULL;
+        rc = filp_close(filter->fo_obt.obt_health_check_filp, 0);
+        filter->fo_obt.obt_health_check_filp = NULL;
         if (rc)
                 CERROR("error closing %s: rc = %d\n", HEALTH_CHECK, rc);
 
         filter_cleanup_groups(obd);
-        filter_free_server_data(filter);
+        filter_free_server_data(&obd->u.obt);
         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 
         filter_free_capa_keys(filter);
@@ -1380,45 +1373,42 @@ static void filter_post(struct obd_device *obd)
 }
 
 static void filter_set_last_id(struct filter_obd *filter,
-                               obd_id id, obd_gr group)
+                               obd_id id, obd_seq group)
 {
-        LASSERT(filter->fo_fsd != NULL);
         LASSERT(group <= filter->fo_group_count);
 
-        spin_lock(&filter->fo_objidlock);
+        cfs_spin_lock(&filter->fo_objidlock);
         filter->fo_last_objids[group] = id;
-        spin_unlock(&filter->fo_objidlock);
+        cfs_spin_unlock(&filter->fo_objidlock);
 }
 
-obd_id filter_last_id(struct filter_obd *filter, obd_gr group)
+obd_id filter_last_id(struct filter_obd *filter, obd_seq group)
 {
         obd_id id;
-        LASSERT(filter->fo_fsd != NULL);
         LASSERT(group <= filter->fo_group_count);
+        LASSERT(filter->fo_last_objids != NULL);
 
         /* FIXME: object groups */
-        spin_lock(&filter->fo_objidlock);
+        cfs_spin_lock(&filter->fo_objidlock);
         id = filter->fo_last_objids[group];
-        spin_unlock(&filter->fo_objidlock);
-
+        cfs_spin_unlock(&filter->fo_objidlock);
         return id;
 }
 
 static int filter_lock_dentry(struct obd_device *obd, struct dentry *dparent)
 {
-        LOCK_INODE_MUTEX(dparent->d_inode);
+        LOCK_INODE_MUTEX_PARENT(dparent->d_inode);
         return 0;
 }
 
 /* We never dget the object parent, so DON'T dput it either */
-struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
+struct dentry *filter_parent(struct obd_device *obd, obd_seq group, obd_id objid)
 {
         struct filter_obd *filter = &obd->u.filter;
         struct filter_subdirs *subdirs;
         LASSERT(group < filter->fo_group_count); /* FIXME: object groups */
 
-        if ((group > 0 && group < FILTER_GROUP_MDS0) || 
-             filter->fo_subdir_count == 0)
+        if (!fid_seq_is_mdt(group) || filter->fo_subdir_count == 0)
                 return filter->fo_dentry_O_groups[group];
 
         subdirs = &filter->fo_dentry_O_sub[group];
@@ -1426,7 +1416,7 @@ struct dentry *filter_parent(struct obd_device *obd, obd_gr group, obd_id objid)
 }
 
 /* We never dget the object parent, so DON'T dput it either */
-struct dentry *filter_parent_lock(struct obd_device *obd, obd_gr group,
+struct dentry *filter_parent_lock(struct obd_device *obd, obd_seq group,
                                   obd_id objid)
 {
         unsigned long now = jiffies;
@@ -1458,7 +1448,7 @@ static void filter_parent_unlock(struct dentry *dparent)
  * internal to the filesystem code. */
 struct dentry *filter_fid2dentry(struct obd_device *obd,
                                  struct dentry *dir_dentry,
-                                 obd_gr group, obd_id id)
+                                 obd_seq group, obd_id id)
 {
         struct dentry *dparent = dir_dentry;
         struct dentry *dchild;
@@ -1482,7 +1472,7 @@ struct dentry *filter_fid2dentry(struct obd_device *obd,
         if (dir_dentry == NULL) {
                 dparent = filter_parent_lock(obd, group, id);
                 if (IS_ERR(dparent)) {
-                        CERROR("%s: error getting object "LPU64":"LPU64
+                        CERROR("%s: error getting object "POSTID
                                " parent: rc %ld\n", obd->obd_name,
                                id, group, PTR_ERR(dparent));
                         RETURN(dparent);
@@ -1494,8 +1484,8 @@ struct dentry *filter_fid2dentry(struct obd_device *obd,
         if (dir_dentry == NULL)
                 filter_parent_unlock(dparent);
         if (IS_ERR(dchild)) {
-                CERROR("%s: child lookup error %ld\n", obd->obd_name,
-                       PTR_ERR(dchild));
+                CERROR("%s: object "LPU64":"LPU64" lookup error: rc %ld\n",
+                       obd->obd_name, id, group, PTR_ERR(dchild));
                 RETURN(dchild);
         }
 
@@ -1515,9 +1505,8 @@ 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 } };
@@ -1529,15 +1518,19 @@ 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,
-                                    &lockh);
-
-        /* We only care about the side-effects, just drop the lock. */
-        if (rc == ELDLM_OK)
-                ldlm_lock_decref(&lockh, LCK_PW);
-
+                                    lockh);
+        if (rc != ELDLM_OK)
+                lockh->cookie = 0;
         RETURN(rc);
 }
 
+static void filter_fini_destroy(struct obd_device *obd,
+                                struct lustre_handle *lockh)
+{
+        if (lustre_handle_is_used(lockh))
+                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
@@ -1596,11 +1589,10 @@ out:
  * Caller must hold child i_mutex, we drop it always.
  * Caller is also required to ensure that dchild->d_inode exists. */
 static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
-                                   obd_gr group, struct dentry *dparent,
+                                   obd_seq group, struct dentry *dparent,
                                    struct dentry *dchild)
 {
         struct inode *inode = dchild->d_inode;
-        struct filter_obd *filter = &obd->u.filter;
         int rc;
 
         if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
@@ -1610,7 +1602,7 @@ static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
                        atomic_read(&inode->i_count));
         }
 
-        rc = filter_vfs_unlink(dparent->d_inode, dchild, filter->fo_vfsmnt);
+        rc = filter_vfs_unlink(dparent->d_inode, dchild, obd->u.obt.obt_vfsmnt);
         if (rc)
                 CERROR("error unlinking objid %.*s: rc %d\n",
                        dchild->d_name.len, dchild->d_name.name, rc);
@@ -1637,7 +1629,7 @@ static enum interval_iter filter_intent_cb(struct interval_node *n,
         if (interval_high(n) <= size)
                 return INTERVAL_ITER_STOP;
 
-        list_for_each_entry(lck, &node->li_group, l_sl_policy) {
+        cfs_list_for_each_entry(lck, &node->li_group, l_sl_policy) {
                 /* Don't send glimpse ASTs to liblustre clients.
                  * They aren't listening for them, and they do
                  * entirely synchronous I/O anyways. */
@@ -1652,7 +1644,7 @@ static enum interval_iter filter_intent_cb(struct interval_node *n,
                         *v = LDLM_LOCK_GET(lck);
                 } else if ((*v)->l_policy_data.l_extent.start <
                            lck->l_policy_data.l_extent.start) {
-                        LDLM_LOCK_PUT(*v);
+                        LDLM_LOCK_RELEASE(*v);
                         *v = LDLM_LOCK_GET(lck);
                 }
 
@@ -1714,14 +1706,15 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
 
         /* FIXME: we should change the policy function slightly, to not make
          * this list at all, since we just turn around and free it */
-        while (!list_empty(&rpc_list)) {
+        while (!cfs_list_empty(&rpc_list)) {
                 struct ldlm_lock *wlock =
-                        list_entry(rpc_list.next, struct ldlm_lock, l_cp_ast);
+                        cfs_list_entry(rpc_list.next, struct ldlm_lock,
+                                       l_cp_ast);
                 LASSERT((lock->l_flags & LDLM_FL_AST_SENT) == 0);
                 LASSERT(lock->l_flags & LDLM_FL_CP_REQD);
                 lock->l_flags &= ~LDLM_FL_CP_REQD;
-                list_del_init(&wlock->l_cp_ast);
-                LDLM_LOCK_PUT(wlock);
+                cfs_list_del_init(&wlock->l_cp_ast);
+                LDLM_LOCK_RELEASE(wlock);
         }
 
         /* The lock met with no resistance; we're finished. */
@@ -1783,7 +1776,7 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
                          *
                          * Of course, this will all disappear when we switch to
                          * taking liblustre locks on the OST. */
-                        ldlm_res_lvbo_update(res, NULL, 0, 1);
+                        ldlm_res_lvbo_update(res, NULL, 1);
                 }
                 RETURN(ELDLM_LOCK_ABORTED);
         }
@@ -1810,14 +1803,14 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
          * sending ast is not handled. This can result in lost client writes.
          */
         if (rc != 0)
-                ldlm_res_lvbo_update(res, NULL, 0, 1);
+                ldlm_res_lvbo_update(res, NULL, 1);
 
         lock_res(res);
         *reply_lvb = *res_lvb;
         unlock_res(res);
 
  out:
-        LDLM_LOCK_PUT(l);
+        LDLM_LOCK_RELEASE(l);
 
         RETURN(ELDLM_LOCK_ABORTED);
 }
@@ -1873,6 +1866,30 @@ static void filter_iobuf_pool_done(struct filter_obd *filter)
         EXIT;
 }
 
+static int filter_adapt_sptlrpc_conf(struct obd_device *obd, int initial)
+{
+        struct filter_obd       *filter = &obd->u.filter;
+        struct sptlrpc_rule_set  tmp_rset;
+        int                      rc;
+
+        sptlrpc_rule_set_init(&tmp_rset);
+        rc = sptlrpc_conf_target_get_rules(obd, &tmp_rset, initial);
+        if (rc) {
+                CERROR("obd %s: failed get sptlrpc rules: %d\n",
+                       obd->obd_name, rc);
+                return rc;
+        }
+
+        sptlrpc_target_update_exp_flavor(obd, &tmp_rset);
+
+        cfs_write_lock(&filter->fo_sptlrpc_lock);
+        sptlrpc_rule_set_free(&filter->fo_sptlrpc_rset);
+        filter->fo_sptlrpc_rset = tmp_rset;
+        cfs_write_unlock(&filter->fo_sptlrpc_lock);
+
+        return 0;
+}
+
 /*
  * pre-allocate pool of iobuf's to be used by filter_{prep,commit}rw_write().
  */
@@ -1899,7 +1916,8 @@ static int filter_iobuf_pool_init(struct filter_obd *filter)
  * If we haven't allocated a pool entry for this thread before, do so now. */
 void *filter_iobuf_get(struct filter_obd *filter, struct obd_trans_info *oti)
 {
-        int thread_id                    = oti ? oti->oti_thread_id : -1;
+        int thread_id                    = (oti && oti->oti_thread) ?
+                                           oti->oti_thread->t_id : -1;
         struct filter_iobuf  *pool       = NULL;
         struct filter_iobuf **pool_place = NULL;
 
@@ -1950,6 +1968,14 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
                 struct lustre_sb_info *lsi = s2lsi(lmi->lmi_sb);
                 mnt = lmi->lmi_mnt;
                 obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
+
+                /* gets recovery timeouts from mount data */
+                if (lsi->lsi_lmd && lsi->lsi_lmd->lmd_recovery_time_soft)
+                        obd->obd_recovery_timeout =
+                                lsi->lsi_lmd->lmd_recovery_time_soft;
+                if (lsi->lsi_lmd && lsi->lsi_lmd->lmd_recovery_time_hard)
+                        obd->obd_recovery_time_hard =
+                                lsi->lsi_lmd->lmd_recovery_time_hard;
         } else {
                 /* old path - used by lctl */
                 CERROR("Using old MDS mount method\n");
@@ -1972,7 +1998,11 @@ 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;
@@ -1985,8 +2015,9 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
                 }
         }
 
-        filter->fo_vfsmnt = mnt;
+        obd->u.obt.obt_vfsmnt = mnt;
         obd->u.obt.obt_sb = mnt->mnt_sb;
+        obd->u.obt.obt_magic = OBT_MAGIC;
         filter->fo_fstype = mnt->mnt_sb->s_type->name;
         CDEBUG(D_SUPER, "%s: mnt = %p\n", filter->fo_fstype, mnt);
 
@@ -1998,39 +2029,38 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         obd->obd_lvfs_ctxt.fs = get_ds();
         obd->obd_lvfs_ctxt.cb_ops = filter_lvfs_ops;
 
-        init_mutex(&filter->fo_init_lock);
+        cfs_init_mutex(&filter->fo_init_lock);
         filter->fo_committed_group = 0;
-
-        rc = filter_prep(obd);
-        if (rc)
-                GOTO(err_ops, rc);
-
         filter->fo_destroys_in_progress = 0;
         for (i = 0; i < 32; i++)
-                sema_init(&filter->fo_create_locks[i], 1);
+                cfs_sema_init(&filter->fo_create_locks[i], 1);
 
-        spin_lock_init(&filter->fo_translock);
-        spin_lock_init(&filter->fo_objidlock);
+        cfs_spin_lock_init(&filter->fo_objidlock);
         CFS_INIT_LIST_HEAD(&filter->fo_export_list);
-        sema_init(&filter->fo_alloc_lock, 1);
+        cfs_sema_init(&filter->fo_alloc_lock, 1);
         init_brw_stats(&filter->fo_filter_stats);
+        cfs_spin_lock_init(&filter->fo_flags_lock);
         filter->fo_read_cache = 1; /* enable read-only cache by default */
-        filter->fo_writethrough_cache = 0; /* 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;
+        filter->fo_syncjournal = 0; /* Don't sync journals on i/o by default */
+        filter_slc_set(filter); /* initialize sync on lock cancel */
+
+        rc = filter_prep(obd);
+        if (rc)
+                GOTO(err_ops, rc);
 
         CFS_INIT_LIST_HEAD(&filter->fo_llog_list);
-        spin_lock_init(&filter->fo_llog_list_lock);
+        cfs_spin_lock_init(&filter->fo_llog_list_lock);
 
-        filter->fo_sptlrpc_lock = RW_LOCK_UNLOCKED;
-        sptlrpc_rule_set_init(&filter->fo_sptlrpc_rset);
+        filter->fo_fl_oss_capa = 1;
 
-        filter->fo_fl_oss_capa = 0;
         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,
@@ -2044,12 +2074,17 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
                            "filter_ldlm_cb_client", &obd->obd_ldlm_client);
 
-        rc = obd_llog_init(obd, &obd->obd_olg, obd, 1, NULL, NULL);
+        rc = obd_llog_init(obd, &obd->obd_olg, obd, NULL);
         if (rc) {
                 CERROR("failed to setup llogging subsystems\n");
                 GOTO(err_post, rc);
         }
 
+        cfs_rwlock_init(&filter->fo_sptlrpc_lock);
+        sptlrpc_rule_set_init(&filter->fo_sptlrpc_rset);
+        /* do this after llog being initialized */
+        filter_adapt_sptlrpc_conf(obd, 1);
+
         rc = lquota_setup(filter_quota_interface_ref, obd);
         if (rc)
                 GOTO(err_post, rc);
@@ -2072,27 +2107,21 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         }
 
         label = fsfilt_get_label(obd, obd->u.obt.obt_sb);
-
-        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",
-                              obd->obd_name, lustre_cfg_string(lcfg, 1),
-                              label ?: "", label ? "/" : "", str,
+        LCONSOLE_INFO("%s: Now serving %s %s%s with recovery %s\n",
+                      obd->obd_name, label ?: str, lmi ? "on " : "",
+                      lmi ? s2lsi(lmi->lmi_sb)->lsi_lmd->lmd_dev : "",
+                      obd->obd_replayable ? "enabled" : "disabled");
+
+        if (obd->obd_recovering)
+                LCONSOLE_WARN("%s: Will be in recovery for at least %d:%.02d, "
+                              "or until %d client%s reconnect%s\n",
+                              obd->obd_name,
                               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);
-        } else {
-                LCONSOLE_INFO("OST %s now serving %s (%s%s%s) with recovery "
-                              "%s\n", obd->obd_name, lustre_cfg_string(lcfg, 1),
-                              label ?: "", label ? "/" : "", str,
-                              obd->obd_replayable ? "enabled" : "disabled");
-        }
+                              (obd->obd_max_recoverable_clients == 1) ? "" : "s",
+                              (obd->obd_max_recoverable_clients == 1) ? "s": "");
+
 
         RETURN(0);
 
@@ -2205,10 +2234,18 @@ static int filter_olg_fini(struct obd_llog_group *olg)
                 rc = llog_cleanup(ctxt);
 
         ctxt = llog_group_get_ctxt(olg, LLOG_SIZE_ORIG_CTXT);
-        if (ctxt)
+        if (ctxt) {
                 rc2 = llog_cleanup(ctxt);
-        if (!rc)
-                rc = rc2;
+                if (!rc)
+                        rc = rc2;
+        }
+
+        ctxt = llog_group_get_ctxt(olg, LLOG_CONFIG_ORIG_CTXT);
+        if (ctxt) {
+                rc2 = llog_cleanup(ctxt);
+                if (!rc)
+                        rc = rc2;
+        }
 
         RETURN(rc);
 }
@@ -2261,13 +2298,18 @@ filter_default_olg_init(struct obd_device *obd, struct obd_llog_group *olg,
         if (rc)
                 GOTO(cleanup_lcm, rc);
 
+        rc = llog_setup(obd, olg, LLOG_CONFIG_ORIG_CTXT, tgt, 0, NULL,
+                        &llog_lvfs_ops);
+        if (rc)
+                GOTO(cleanup_olg, rc);
+
         ctxt = llog_group_get_ctxt(olg, LLOG_MDS_OST_REPL_CTXT);
         if (!ctxt) {
                 CERROR("Can't get ctxt for %p:%x\n", 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);
 
@@ -2282,8 +2324,7 @@ cleanup_lcm:
 
 static int
 filter_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
-                 struct obd_device *tgt, int count, struct llog_catid *catid,
-                 struct obd_uuid *uuid)
+                 struct obd_device *tgt, int *index)
 {
         struct filter_obd *filter = &obd->u.filter;
         struct llog_ctxt *ctxt;
@@ -2306,7 +2347,7 @@ 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);
 }
@@ -2318,23 +2359,33 @@ static int filter_llog_finish(struct obd_device *obd, int count)
         ENTRY;
 
         ctxt = llog_group_get_ctxt(&obd->obd_olg, LLOG_MDS_OST_REPL_CTXT);
-        LASSERT(ctxt != NULL);
-        mutex_down(&ctxt->loc_sem);
-        if (ctxt->loc_imp) {
+        if (ctxt) {
+                /*
+                 * Make sure that no cached llcds left in recov_thread.
+                 * We actually do sync in disconnect time, but disconnect
+                 * may not come being marked rq_no_resend = 1.
+                 */
+                llog_sync(ctxt, NULL);
+
                 /*
-                 * Balance class_import_get() in llog_receptor_accept(). This
-                 * is safe to do here, as llog is already synchronized and its
-                 * import may go.
+                 * Balance class_import_get() in llog_receptor_accept().
+                 * This is safe to do, as llog is already synchronized
+                 * and its import may go.
                  */
-                class_import_put(ctxt->loc_imp);
-                ctxt->loc_imp = NULL;
+                cfs_mutex_down(&ctxt->loc_sem);
+                if (ctxt->loc_imp) {
+                        class_import_put(ctxt->loc_imp);
+                        ctxt->loc_imp = NULL;
+                }
+                cfs_mutex_up(&ctxt->loc_sem);
+                llog_ctxt_put(ctxt);
         }
-        mutex_up(&ctxt->loc_sem);
-        llog_ctxt_put(ctxt);
 
         if (filter->fo_lcm) {
+                cfs_mutex_down(&ctxt->loc_sem);
                 llog_recov_thread_fini(filter->fo_lcm, obd->obd_force);
                 filter->fo_lcm = NULL;
+                cfs_mutex_up(&ctxt->loc_sem);
         }
         RETURN(filter_olg_fini(&obd->obd_olg));
 }
@@ -2348,8 +2399,8 @@ filter_find_olg_internal(struct filter_obd *filter, int group)
         struct obd_llog_group *olg;
 
         LASSERT_SPIN_LOCKED(&filter->fo_llog_list_lock);
-        list_for_each_entry(olg, &filter->fo_llog_list, olg_list) {
-                if (olg->olg_group == group)
+        cfs_list_for_each_entry(olg, &filter->fo_llog_list, olg_list) {
+                if (olg->olg_seq == group)
                         RETURN(olg);
         }
         RETURN(NULL);
@@ -2365,12 +2416,12 @@ struct obd_llog_group *filter_find_olg(struct obd_device *obd, int group)
 
         filter = &obd->u.filter;
 
-        if (group == FILTER_GROUP_LLOG)
+        if (group == FID_SEQ_LLOG)
                 RETURN(&obd->obd_olg);
 
-        spin_lock(&filter->fo_llog_list_lock);
+        cfs_spin_lock(&filter->fo_llog_list_lock);
         olg = filter_find_olg_internal(filter, group);
-        spin_unlock(&filter->fo_llog_list_lock);
+        cfs_spin_unlock(&filter->fo_llog_list_lock);
 
         RETURN(olg);
 }
@@ -2387,10 +2438,10 @@ struct obd_llog_group *filter_find_create_olg(struct obd_device *obd, int group)
 
         filter = &obd->u.filter;
 
-        if (group == FILTER_GROUP_LLOG)
+        if (group == FID_SEQ_LLOG)
                 RETURN(&obd->obd_olg);
 
-        spin_lock(&filter->fo_llog_list_lock);
+        cfs_spin_lock(&filter->fo_llog_list_lock);
         olg = filter_find_olg_internal(filter, group);
         if (olg) {
                 if (olg->olg_initializing) {
@@ -2404,28 +2455,28 @@ struct obd_llog_group *filter_find_create_olg(struct obd_device *obd, int group)
                GOTO(out_unlock, olg = ERR_PTR(-ENOMEM));
 
         llog_group_init(olg, group);
-        list_add(&olg->olg_list, &filter->fo_llog_list);
+        cfs_list_add(&olg->olg_list, &filter->fo_llog_list);
         olg->olg_initializing = 1;
-        spin_unlock(&filter->fo_llog_list_lock);
+        cfs_spin_unlock(&filter->fo_llog_list_lock);
 
-        rc = llog_cat_initialize(obd, olg, 1, NULL);
+        rc = obd_llog_init(obd, olg, obd, NULL);
         if (rc) {
-               spin_lock(&filter->fo_llog_list_lock);
-               list_del(&olg->olg_list);
-               spin_unlock(&filter->fo_llog_list_lock);
+               cfs_spin_lock(&filter->fo_llog_list_lock);
+               cfs_list_del(&olg->olg_list);
+               cfs_spin_unlock(&filter->fo_llog_list_lock);
                OBD_FREE_PTR(olg);
                GOTO(out, olg = ERR_PTR(-ENOMEM));
         }
-        spin_lock(&filter->fo_llog_list_lock);
+        cfs_spin_lock(&filter->fo_llog_list_lock);
         olg->olg_initializing = 0;
-        spin_unlock(&filter->fo_llog_list_lock);
+        cfs_spin_unlock(&filter->fo_llog_list_lock);
         CDEBUG(D_OTHER, "%s: new llog group %u (0x%p)\n",
               obd->obd_name, group, olg);
 out:
         RETURN(olg);
 
 out_unlock:
-        spin_unlock(&filter->fo_llog_list_lock);
+        cfs_spin_unlock(&filter->fo_llog_list_lock);
         GOTO(out, olg);
 }
 
@@ -2438,15 +2489,14 @@ static int filter_llog_connect(struct obd_export *exp,
         int rc;
         ENTRY;
 
-        CDEBUG(D_OTHER, "handle connect for %s: %u/%u/%u\n", obd->obd_name,
-                (unsigned) body->lgdc_logid.lgl_ogr,
-                (unsigned) body->lgdc_logid.lgl_oid,
-                (unsigned) body->lgdc_logid.lgl_ogen);
+        CDEBUG(D_OTHER, "%s: LLog connect for: "LPX64"/"LPX64":%x\n",
+               obd->obd_name, body->lgdc_logid.lgl_oid,
+               body->lgdc_logid.lgl_oseq, body->lgdc_logid.lgl_ogen);
 
-        olg = filter_find_olg(obd, body->lgdc_logid.lgl_ogr);
+        olg = filter_find_olg(obd, body->lgdc_logid.lgl_oseq);
         if (!olg) {
                 CERROR(" %s: can not find olg of group %d\n",
-                       obd->obd_name, (int)body->lgdc_logid.lgl_ogr);
+                       obd->obd_name, (int)body->lgdc_logid.lgl_oseq);
                 RETURN(-ENOENT);
         }
         llog_group_set_export(olg, exp);
@@ -2454,7 +2504,15 @@ static int filter_llog_connect(struct obd_export *exp,
         ctxt = llog_group_get_ctxt(olg, body->lgdc_ctxt_idx);
         LASSERTF(ctxt != NULL, "ctxt is not null, ctxt idx %d \n",
                  body->lgdc_ctxt_idx);
-        rc = llog_connect(ctxt, 1, &body->lgdc_logid,
+
+        CWARN("%s: Recovery from log "LPX64"/"LPX64":%x\n",
+              obd->obd_name, body->lgdc_logid.lgl_oid,
+              body->lgdc_logid.lgl_oseq, body->lgdc_logid.lgl_ogen);
+
+        cfs_spin_lock(&obd->u.filter.fo_flags_lock);
+        obd->u.filter.fo_mds_ost_sync = 1;
+        cfs_spin_unlock(&obd->u.filter.fo_flags_lock);
+        rc = llog_connect(ctxt, &body->lgdc_logid,
                           &body->lgdc_gen, NULL);
         llog_ctxt_put(ctxt);
         if (rc != 0)
@@ -2468,7 +2526,7 @@ static int filter_llog_preclean(struct obd_device *obd)
 {
         struct obd_llog_group *olg, *tmp;
         struct filter_obd *filter;
-        struct list_head  remove_list;
+        cfs_list_t  remove_list;
         int rc = 0;
         ENTRY;
 
@@ -2479,21 +2537,21 @@ static int filter_llog_preclean(struct obd_device *obd)
         filter = &obd->u.filter;
         CFS_INIT_LIST_HEAD(&remove_list);
 
-        spin_lock(&filter->fo_llog_list_lock);
-        while (!list_empty(&filter->fo_llog_list)) {
-                olg = list_entry(filter->fo_llog_list.next,
-                                 struct obd_llog_group, olg_list);
-                list_del(&olg->olg_list);
-                list_add(&olg->olg_list, &remove_list);
+        cfs_spin_lock(&filter->fo_llog_list_lock);
+        while (!cfs_list_empty(&filter->fo_llog_list)) {
+                olg = cfs_list_entry(filter->fo_llog_list.next,
+                                     struct obd_llog_group, olg_list);
+                cfs_list_del(&olg->olg_list);
+                cfs_list_add(&olg->olg_list, &remove_list);
         }
-        spin_unlock(&filter->fo_llog_list_lock);
+        cfs_spin_unlock(&filter->fo_llog_list_lock);
 
-        list_for_each_entry_safe(olg, tmp, &remove_list, olg_list) {
-                list_del_init(&olg->olg_list);
+        cfs_list_for_each_entry_safe(olg, tmp, &remove_list, olg_list) {
+                cfs_list_del_init(&olg->olg_list);
                 rc = filter_olg_fini(olg);
                 if (rc)
                         CERROR("failed to cleanup llogging subsystem for %u\n",
-                               olg->olg_group);
+                               olg->olg_seq);
                 OBD_FREE_PTR(olg);
         }
 
@@ -2510,7 +2568,8 @@ 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;
         }
@@ -2526,14 +2585,8 @@ 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);
@@ -2541,10 +2594,6 @@ 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;
 
@@ -2558,7 +2607,7 @@ static int filter_cleanup(struct obd_device *obd)
         LL_DQUOT_OFF(obd->u.obt.obt_sb);
         shrink_dcache_sb(obd->u.obt.obt_sb);
 
-        server_put_mount(obd->obd_name, filter->fo_vfsmnt);
+        server_put_mount(obd->obd_name, obd->u.obt.obt_vfsmnt);
         obd->u.obt.obt_sb = NULL;
 
         fsfilt_put_ops(obd->obd_fsops);
@@ -2571,7 +2620,8 @@ static int filter_cleanup(struct obd_device *obd)
 }
 
 static int filter_connect_internal(struct obd_export *exp,
-                                   struct obd_connect_data *data)
+                                   struct obd_connect_data *data,
+                                   int reconnect)
 {
         struct filter_export_data *fed = &exp->exp_filter_data;
 
@@ -2598,25 +2648,32 @@ 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);
+                cfs_spin_lock(&exp->exp_obd->obd_osfs_lock);
                 left = filter_grant_space_left(exp);
                 want = data->ocd_grant;
-                filter_grant(exp, fed->fed_grant, want, left);
+                filter_grant(exp, fed->fed_grant, want, left, (reconnect == 0));
                 data->ocd_grant = fed->fed_grant;
-                spin_unlock(&exp->exp_obd->obd_osfs_lock);
+                cfs_spin_unlock(&exp->exp_obd->obd_osfs_lock);
 
                 CDEBUG(D_CACHE, "%s: cli %s/%p ocd_grant: %d want: "
                        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) {
-                struct filter_obd *filter = &exp->exp_obd->u.filter;
-                struct lr_server_data *lsd = filter->fo_fsd;
+                struct lr_server_data *lsd = class_server_data(exp->exp_obd);
                 int index = le32_to_cpu(lsd->lsd_ost_index);
 
                 if (!(lsd->lsd_feature_compat &
@@ -2624,8 +2681,9 @@ static int filter_connect_internal(struct obd_export *exp,
                         /* this will only happen on the first connect */
                         lsd->lsd_ost_index = cpu_to_le32(data->ocd_index);
                         lsd->lsd_feature_compat |= cpu_to_le32(OBD_COMPAT_OST);
-                        filter_update_server_data(exp->exp_obd,
-                                                  filter->fo_rcvd_filp, lsd, 1);
+                        /* sync is not needed here as filter_client_add will
+                         * set exp_need_sync flag */
+                        filter_update_server_data(exp->exp_obd);
                 } else if (index != data->ocd_index) {
                         LCONSOLE_ERROR_MSG(0x136, "Connection from %s to index"
                                            " %u doesn't match actual OST index"
@@ -2635,6 +2693,10 @@ static int filter_connect_internal(struct obd_export *exp,
                                            data->ocd_index);
                         RETURN(-EBADF);
                 }
+                /* FIXME: Do the same with the MDS UUID and lsd_peeruuid.
+                 * FIXME: We don't strictly need the COMPAT flag for that,
+                 * FIXME: as lsd_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)) {
@@ -2669,18 +2731,14 @@ 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);
 }
 
 static int filter_reconnect(const struct lu_env *env,
                             struct obd_export *exp, struct obd_device *obd,
                             struct obd_uuid *cluuid,
-                            struct obd_connect_data *data)
+                            struct obd_connect_data *data,
+                            void *localdata)
 {
         int rc;
         ENTRY;
@@ -2688,61 +2746,53 @@ static int filter_reconnect(const struct lu_env *env,
         if (exp == NULL || obd == NULL || cluuid == NULL)
                 RETURN(-EINVAL);
 
-        rc = filter_connect_internal(exp, data);
+        rc = filter_connect_internal(exp, data, 1);
+        if (rc == 0)
+                filter_export_stats_init(obd, exp, 1, localdata);
 
         RETURN(rc);
 }
 
 /* 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 filter_export_data *fed;
-        struct lsd_client_data *lcd = NULL;
+        struct lustre_handle conn = { 0 };
+        struct obd_export *lexp;
         __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;
-
-        rc = filter_connect_internal(exp, data);
+        rc = filter_connect_internal(lexp, data, 0);
         if (rc)
                 GOTO(cleanup, rc);
 
-        filter_export_stats_init(obd, exp, localdata);
+        filter_export_stats_init(obd, lexp, 0, localdata);
         if (obd->obd_replayable) {
-                OBD_ALLOC(lcd, sizeof(*lcd));
-                if (!lcd) {
-                        CERROR("filter: out of memory for client data\n");
-                        GOTO(cleanup, rc = -ENOMEM);
-                }
-
+                struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
+                LASSERT(lcd);
                 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);
         }
 
         group = data->ocd_group;
-        if (group == 0)
-                GOTO(cleanup, rc);
 
         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);
@@ -2756,13 +2806,10 @@ static int filter_connect(const struct lu_env *env,
 
 cleanup:
         if (rc) {
-                if (lcd) {
-                        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);
@@ -2779,7 +2826,7 @@ static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
         obd_size tot_dirty = 0, tot_pending = 0, tot_granted = 0;
         obd_size fo_tot_dirty, fo_tot_pending, fo_tot_granted;
 
-        if (list_empty(&obd->obd_exports))
+        if (cfs_list_empty(&obd->obd_exports))
                 return;
 
         /* We don't want to do this for large machines that do lots of
@@ -2787,9 +2834,9 @@ static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
         if (obd->obd_num_exports > 100)
                 return;
 
-        spin_lock(&obd->obd_osfs_lock);
-        spin_lock(&obd->obd_dev_lock);
-        list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
+        cfs_spin_lock(&obd->obd_osfs_lock);
+        cfs_spin_lock(&obd->obd_dev_lock);
+        cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
                 int error = 0;
                 fed = &exp->exp_filter_data;
                 if (fed->fed_grant < 0 || fed->fed_pending < 0 ||
@@ -2820,8 +2867,8 @@ static void filter_grant_sanity_check(struct obd_device *obd, const char *func)
         fo_tot_granted = obd->u.filter.fo_tot_granted;
         fo_tot_pending = obd->u.filter.fo_tot_pending;
         fo_tot_dirty = obd->u.filter.fo_tot_dirty;
-        spin_unlock(&obd->obd_dev_lock);
-        spin_unlock(&obd->obd_osfs_lock);
+        cfs_spin_unlock(&obd->obd_dev_lock);
+        cfs_spin_unlock(&obd->obd_osfs_lock);
 
         /* Do these assertions outside the spinlocks so we don't kill system */
         if (tot_granted != fo_tot_granted)
@@ -2854,11 +2901,7 @@ static void filter_grant_discard(struct obd_export *exp)
         struct filter_obd *filter = &obd->u.filter;
         struct filter_export_data *fed = &exp->exp_filter_data;
 
-        spin_lock(&obd->obd_osfs_lock);
-        spin_lock(&obd->obd_dev_lock);
-        list_del_init(&exp->exp_obd_chain);
-        spin_unlock(&obd->obd_dev_lock);
-
+        cfs_spin_lock(&obd->obd_osfs_lock);
         LASSERTF(filter->fo_tot_granted >= fed->fed_grant,
                  "%s: tot_granted "LPU64" cli %s/%p fed_grant %ld\n",
                  obd->obd_name, filter->fo_tot_granted,
@@ -2877,39 +2920,42 @@ static void filter_grant_discard(struct obd_export *exp)
         fed->fed_dirty = 0;
         fed->fed_grant = 0;
 
-        spin_unlock(&obd->obd_osfs_lock);
+        cfs_spin_unlock(&obd->obd_osfs_lock);
 }
 
 static int filter_destroy_export(struct obd_export *exp)
 {
+        struct filter_export_data *fed = &exp->exp_filter_data;
         ENTRY;
 
-        if (exp->exp_filter_data.fed_pending)
+        if (fed->fed_pending)
                 CERROR("%s: cli %s/%p has %lu pending on destroyed export\n",
                        exp->exp_obd->obd_name, exp->exp_client_uuid.uuid,
-                       exp, exp->exp_filter_data.fed_pending);
+                       exp, fed->fed_pending);
 
-        /* Not ported yet the b1_6 quota functionality
-         * lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
-         */
+        lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
 
         target_destroy_export(exp);
         ldlm_destroy_export(exp);
+        lut_client_free(exp);
 
         if (obd_uuid_equals(&exp->exp_client_uuid, &exp->exp_obd->obd_uuid))
                 RETURN(0);
 
-
-        if (exp->exp_obd->obd_replayable)
-                filter_client_free(exp);
-        else
+        if (!exp->exp_obd->obd_replayable)
                 fsfilt_sync(exp->exp_obd, exp->exp_obd->u.obt.obt_sb);
 
         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__);
+                filter_grant_sanity_check(exp->exp_obd, __func__);
 
         RETURN(0);
 }
@@ -2918,7 +2964,7 @@ static void filter_sync_llogs(struct obd_device *obd, struct obd_export *dexp)
 {
         struct obd_llog_group *olg_min, *olg;
         struct filter_obd *filter;
-        int worked = 0, group;
+        int worked = -1, group;
         struct llog_ctxt *ctxt;
         ENTRY;
 
@@ -2931,42 +2977,44 @@ static void filter_sync_llogs(struct obd_device *obd, struct obd_export *dexp)
                 /* look for group with min. number, but > worked */
                 olg_min = NULL;
                 group = 1 << 30;
-                spin_lock(&filter->fo_llog_list_lock);
-                list_for_each_entry(olg, &filter->fo_llog_list, olg_list) {
-                        if (olg->olg_group <= worked) {
+                cfs_spin_lock(&filter->fo_llog_list_lock);
+                cfs_list_for_each_entry(olg, &filter->fo_llog_list, olg_list) {
+                        if (olg->olg_seq <= worked) {
                                 /* this group is already synced */
                                 continue;
                         }
-                        if (group < olg->olg_group) {
+                        if (group < olg->olg_seq) {
                                 /* we have group with smaller number to sync */
                                 continue;
                         }
                         /* store current minimal group */
                         olg_min = olg;
-                        group = olg->olg_group;
+                        group = olg->olg_seq;
                 }
-                spin_unlock(&filter->fo_llog_list_lock);
+                cfs_spin_unlock(&filter->fo_llog_list_lock);
 
                 if (olg_min == NULL)
                         break;
 
-                worked = olg_min->olg_group;
+                worked = olg_min->olg_seq;
                 if (olg_min->olg_exp &&
                     (dexp == olg_min->olg_exp || dexp == NULL)) {
                         int err;
                         ctxt = llog_group_get_ctxt(olg_min,
-                                                LLOG_MDS_OST_REPL_CTXT);
-                        LASSERT(ctxt != NULL);
-                        err = llog_sync(ctxt, olg_min->olg_exp);
-                        llog_ctxt_put(ctxt);
-                        if (err)
-                                CERROR("error flushing logs to MDS: rc %d\n",
-                                       err);
+                                                   LLOG_MDS_OST_REPL_CTXT);
+                        if (ctxt) {
+                                err = llog_sync(ctxt, olg_min->olg_exp);
+                                llog_ctxt_put(ctxt);
+                                if (err) {
+                                        CERROR("error flushing logs to MDS: "
+                                               "rc %d\n", err);
+                                }
+                        }
                 }
         } while (olg_min != NULL);
 }
 
-/* also incredibly similar to mds_disconnect */
+/* Also incredibly similar to mds_disconnect */
 static int filter_disconnect(struct obd_export *exp)
 {
         struct obd_device *obd = exp->exp_obd;
@@ -2977,20 +3025,22 @@ static int filter_disconnect(struct obd_export *exp)
         class_export_get(exp);
 
         if (!(exp->exp_flags & OBD_OPT_FORCE))
-                filter_grant_sanity_check(obd, __FUNCTION__);
+                filter_grant_sanity_check(obd, __func__);
         filter_grant_discard(exp);
 
-        /* Disconnect early so that clients can't keep using export */
-        rc = class_disconnect(exp);
-        if (exp->exp_obd->obd_namespace != NULL)
-                ldlm_cancel_locks_for_export(exp);
+        /* Flush any remaining cancel messages out to the target */
+        filter_sync_llogs(obd, exp);
 
-        fsfilt_sync(obd, obd->u.obt.obt_sb);
+        lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
 
-        lprocfs_exp_cleanup(exp);
+        rc = server_disconnect_export(exp);
+
+        /* Do not erase record for recoverable client. */
+        if (obd->obd_replayable && (!obd->obd_fail || exp->exp_failed))
+                filter_client_del(exp);
+        else
+                fsfilt_sync(obd, obd->u.obt.obt_sb);
 
-        /* flush any remaining cancel messages out to the target */
-        filter_sync_llogs(obd, exp);
         class_export_put(exp);
         RETURN(rc);
 }
@@ -3012,31 +3062,26 @@ static void filter_revimp_update(struct obd_export *exp)
 static int filter_ping(struct obd_export *exp)
 {
         filter_fmd_expire(exp);
-
         return 0;
 }
 
-struct dentry *__filter_oa2dentry(struct obd_device *obd, struct obdo *oa,
+struct dentry *__filter_oa2dentry(struct obd_device *obd, struct ost_id *ostid,
                                   const char *what, int quiet)
 {
         struct dentry *dchild = NULL;
-        obd_gr group = 0;
-
-        if (oa->o_valid & OBD_MD_FLGROUP)
-                group = oa->o_gr;
 
-        dchild = filter_fid2dentry(obd, NULL, group, oa->o_id);
+        dchild = filter_fid2dentry(obd, NULL,  ostid->oi_seq, ostid->oi_id);
 
         if (IS_ERR(dchild)) {
-                CERROR("%s error looking up object: "LPU64":"LPU64"\n",
-                       what, group, oa->o_id);
+                CERROR("%s error looking up object: "POSTID"\n",
+                       what, ostid->oi_id, ostid->oi_seq);
                 RETURN(dchild);
         }
 
         if (dchild->d_inode == NULL) {
                 if (!quiet)
-                        CERROR("%s: %s on non-existent object: "LPU64"\n",
-                               obd->obd_name, what, oa->o_id);
+                        CERROR("%s: %s on non-existent object: "POSTID" \n",
+                               obd->obd_name, what, ostid->oi_id,ostid->oi_seq);
                 f_dput(dchild);
                 RETURN(ERR_PTR(-ENOENT));
         }
@@ -3051,7 +3096,7 @@ static int filter_getattr(struct obd_export *exp, struct obd_info *oinfo)
         int rc = 0;
         ENTRY;
 
-        rc = filter_auth_capa(exp, NULL, oinfo_mdsno(oinfo),
+        rc = filter_auth_capa(exp, NULL, oinfo->oi_oa->o_seq,
                               oinfo_capa(oinfo), CAPA_OPC_META_READ);
         if (rc)
                 RETURN(rc);
@@ -3062,13 +3107,13 @@ static int filter_getattr(struct obd_export *exp, struct obd_info *oinfo)
                 RETURN(-EINVAL);
         }
 
-        dentry = filter_oa2dentry(obd, oinfo->oi_oa);
+        dentry = filter_oa2dentry(obd, &oinfo->oi_oa->o_oi);
         if (IS_ERR(dentry))
                 RETURN(PTR_ERR(dentry));
 
         /* Limit the valid bits in the return data to what we actually use */
         oinfo->oi_oa->o_valid = OBD_MD_FLID;
-        obdo_from_inode(oinfo->oi_oa, dentry->d_inode, FILTER_VALID_FLAGS);
+        obdo_from_inode(oinfo->oi_oa, dentry->d_inode, NULL, FILTER_VALID_FLAGS);
 
         f_dput(dentry);
         RETURN(rc);
@@ -3087,19 +3132,21 @@ int filter_update_fidea(struct obd_export *exp, struct inode *inode,
                 struct filter_fid ff;
 
                 if (!(oa->o_valid & OBD_MD_FLGROUP))
-                        oa->o_gr = 0;
+                        oa->o_seq = 0;
                 /* packing fid and converting it to LE for storing into EA.
                  * Here ->o_stripe_idx should be filled by LOV and rest of
                  * fields - by client. */
-                ff.ff_fid.id = cpu_to_le64(oa->o_fid);
-                ff.ff_fid.f_type = cpu_to_le32(oa->o_stripe_idx);
-                ff.ff_fid.generation = cpu_to_le32(oa->o_generation);
+                ff.ff_parent.f_seq = cpu_to_le64(oa->o_parent_seq);
+                ff.ff_parent.f_oid = cpu_to_le32(oa->o_parent_oid);
+                /* XXX: we are ignoring o_parent_ver here, since this should
+                 *      be the same for all objects in this fileset. */
+                ff.ff_parent.f_ver = cpu_to_le32(oa->o_stripe_idx);
                 ff.ff_objid = cpu_to_le64(oa->o_id);
-                ff.ff_group = cpu_to_le64(oa->o_gr);
+                ff.ff_seq = cpu_to_le64(oa->o_seq);
 
-                CDEBUG(D_INODE, "storing filter fid EA ("LPU64"/%u/%u"
-                       LPU64"/"LPU64")\n", oa->o_fid, oa->o_stripe_idx,
-                       oa->o_generation, oa->o_id, oa->o_gr);
+                CDEBUG(D_INODE, "storing filter fid EA (parent "DFID" "
+                       LPU64"/"LPU64")\n", PFID(&ff.ff_parent), oa->o_id,
+                       oa->o_seq);
 
                 rc = fsfilt_set_md(obd, inode, handle, &ff, sizeof(ff), "fid");
                 if (rc)
@@ -3118,9 +3165,11 @@ 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;
+        struct page *page = NULL;
         struct iattr iattr;
         void *handle;
         ENTRY;
@@ -3140,11 +3189,31 @@ 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)) {
+        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);
+
+        /* Let's pin the last page so that ldiskfs_truncate
+         * should not start GFP_FS allocation. */
+        if (ia_valid & ATTR_SIZE) {
+                page = grab_cache_page(inode->i_mapping,
+                                       iattr.ia_size >> PAGE_CACHE_SHIFT);
+                if (page == NULL)
+                        GOTO(out_unlock, rc = -ENOMEM);
+
+                unlock_page(page);
         }
 
         /* If the inode still has SUID+SGID bits set (see filter_precreate())
@@ -3191,8 +3260,8 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
                         GOTO(out_unlock, rc = PTR_ERR(handle));
         }
         if (oa->o_valid & OBD_MD_FLFLAGS) {
-                rc = fsfilt_iocontrol(exp->exp_obd, inode, NULL,
-                                      EXT3_IOC_SETFLAGS, (long)&oa->o_flags);
+                rc = fsfilt_iocontrol(exp->exp_obd, dentry,
+                                      FSFILT_IOC_SETFLAGS, (long)&oa->o_flags);
         } else {
                 rc = fsfilt_setattr(exp->exp_obd, dentry, handle, &iattr, 1);
                 if (fcc != NULL)
@@ -3205,11 +3274,11 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
         if (OBD_FAIL_CHECK(OBD_FAIL_OST_SETATTR_CREDITS))
                 fsfilt_extend(exp->exp_obd, inode, 0, handle);
 
-        /* The truncate might have used up our transaction credits.  Make
-         * sure we have one left for the last_rcvd update. */
-        err = fsfilt_extend(exp->exp_obd, inode, 1, handle);
+       /* The truncate might have used up our transaction credits.  Make sure
+        * we have two left for the last_rcvd and VBR inode version updates. */
+        err = fsfilt_extend(exp->exp_obd, inode, 2, 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;
@@ -3224,18 +3293,26 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
                 fcc = NULL;
         }
 
-        if (locked) {
-                /* truncate can leave dirty pages in the cache.
-                 * we'll take care of them in write path -bzzz */
-                UNLOCK_INODE_MUTEX(inode);
-                locked = 0;
+        /* For a partial-page truncate flush the page to disk immediately
+         * to avoid data corruption during direct disk write. b=17397 */
+        if (!sync && (iattr.ia_valid & ATTR_SIZE) &&
+            old_size != iattr.ia_size && (iattr.ia_size & ~CFS_PAGE_MASK)) {
+                err = filemap_fdatawrite_range(inode->i_mapping, iattr.ia_size,
+                                               iattr.ia_size + 1);
+                if (!rc)
+                        rc = err;
         }
 
         EXIT;
+
 out_unlock:
-        if (locked)
-                UNLOCK_INODE_MUTEX(inode);
+        if (page)
+                page_cache_release(page);
 
+        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));
 
@@ -3255,60 +3332,77 @@ out_unlock:
 int filter_setattr(struct obd_export *exp, struct obd_info *oinfo,
                    struct obd_trans_info *oti)
 {
+        struct obdo *oa = oinfo->oi_oa;
+        struct lustre_capa *capa = oinfo_capa(oinfo);
         struct ldlm_res_id res_id;
         struct filter_mod_data *fmd;
         struct lvfs_run_ctxt saved;
         struct filter_obd *filter;
         struct ldlm_resource *res;
         struct dentry *dentry;
+        __u64 opc = CAPA_OPC_META_WRITE;
         int rc;
         ENTRY;
 
-        osc_build_res_name(oinfo->oi_oa->o_id, oinfo->oi_oa->o_gr, &res_id);
-        rc = filter_auth_capa(exp, NULL, oinfo_mdsno(oinfo),
-                              oinfo_capa(oinfo), CAPA_OPC_META_WRITE);
+        if (oa->o_valid & OBD_FL_TRUNC)
+                opc |= CAPA_OPC_OSS_TRUNC;
+
+        rc = filter_auth_capa(exp, NULL, oa->o_seq, capa, opc);
         if (rc)
                 RETURN(rc);
 
+        if (oa->o_valid & (OBD_MD_FLUID | OBD_MD_FLGID)) {
+                rc = filter_capa_fixoa(exp, oa, oa->o_seq, capa);
+                if (rc)
+                        RETURN(rc);
+        }
+
+        osc_build_res_name(oa->o_id, oa->o_seq, &res_id);
         /* This would be very bad - accidentally truncating a file when
          * changing the time or similar - bug 12203. */
-        if (oinfo->oi_oa->o_valid & OBD_MD_FLSIZE &&
+        if (oa->o_valid & OBD_MD_FLSIZE &&
             oinfo->oi_policy.l_extent.end != OBD_OBJECT_EOF) {
                 static char mdsinum[48];
 
-                if (oinfo->oi_oa->o_valid & OBD_MD_FLFID)
-                        snprintf(mdsinum, sizeof(mdsinum) - 1,
-                                 " of inode "LPU64"/%u", oinfo->oi_oa->o_fid,
-                                 oinfo->oi_oa->o_generation);
+                if (oa->o_valid & OBD_MD_FLFID)
+                        snprintf(mdsinum, sizeof(mdsinum) - 1, " of inode "DFID,
+                                 oa->o_parent_seq, oa->o_parent_oid,
+                                 oa->o_parent_ver);
                 else
                         mdsinum[0] = '\0';
 
-                CERROR("%s: setattr from %s trying to truncate objid "LPU64
-                       " %s\n",
-                       exp->exp_obd->obd_name, obd_export_nid2str(exp),
-                       oinfo->oi_oa->o_id, mdsinum);
+                CERROR("%s: setattr from %s trying to truncate objid "POSTID
+                       "%s\n", exp->exp_obd->obd_name, obd_export_nid2str(exp),
+                       oa->o_id, oa->o_seq, mdsinum);
                 RETURN(-EPERM);
         }
 
-        dentry = __filter_oa2dentry(exp->exp_obd, oinfo->oi_oa,
-                                    __FUNCTION__, 1);
+        dentry = __filter_oa2dentry(exp->exp_obd, &oinfo->oi_oa->o_oi, __func__, 1);
         if (IS_ERR(dentry))
                 RETURN(PTR_ERR(dentry));
 
         filter = &exp->exp_obd->u.filter;
         push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
-        lock_kernel();
 
-        if (oinfo->oi_oa->o_valid &
+        /*
+         * We need to be atomic against a concurrent write
+         * (which takes the semaphore for reading). fmd_mactime_xid
+         * checks will have no effect if a write request with lower
+         * xid starts just before a setattr and finishes later than
+         * the setattr (see bug 21489, comment 27).
+         */
+        if (oa->o_valid &
             (OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME)) {
-                fmd = filter_fmd_get(exp,oinfo->oi_oa->o_id,oinfo->oi_oa->o_gr);
+                down_write(&dentry->d_inode->i_alloc_sem);
+                fmd = filter_fmd_get(exp, oa->o_id, oa->o_seq);
                 if (fmd && fmd->fmd_mactime_xid < oti->oti_xid)
                         fmd->fmd_mactime_xid = oti->oti_xid;
                 filter_fmd_put(exp, fmd);
+                up_write(&dentry->d_inode->i_alloc_sem);
         }
 
         /* setting objects attributes (including owner/group) */
-        rc = filter_setattr_internal(exp, dentry, oinfo->oi_oa, oti);
+        rc = filter_setattr_internal(exp, dentry, oa, oti);
         if (rc)
                 GOTO(out_unlock, rc);
 
@@ -3316,19 +3410,20 @@ int filter_setattr(struct obd_export *exp, struct obd_info *oinfo,
                                 &res_id, LDLM_EXTENT, 0);
 
         if (res != NULL) {
-                rc = ldlm_res_lvbo_update(res, NULL, 0, 0);
+                LDLM_RESOURCE_ADDREF(res);
+                rc = ldlm_res_lvbo_update(res, NULL, 0);
+                LDLM_RESOURCE_DELREF(res);
                 ldlm_resource_putref(res);
         }
 
-        oinfo->oi_oa->o_valid = OBD_MD_FLID;
+        oa->o_valid = OBD_MD_FLID;
 
         /* Quota release need uid/gid info */
-        obdo_from_inode(oinfo->oi_oa, dentry->d_inode,
+        obdo_from_inode(oa, dentry->d_inode, NULL,
                         FILTER_VALID_FLAGS | OBD_MD_FLUID | OBD_MD_FLGID);
 
         EXIT;
 out_unlock:
-        unlock_kernel();
         f_dput(dentry);
         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
         return rc;
@@ -3390,64 +3485,81 @@ static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
         RETURN(lsm_size);
 }
 
-/* caller must hold fo_create_locks[oa->o_gr] */
+/* caller must hold fo_create_locks[oa->o_seq] */
 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);
-        LASSERT(oa->o_gr != 0);
-        LASSERT(oa->o_valid & OBD_MD_FLGROUP);
-        LASSERT(down_trylock(&filter->fo_create_locks[oa->o_gr]) != 0);
+        LASSERT(down_trylock(&filter->fo_create_locks[oa->o_seq]) != 0);
 
         memset(&doa, 0, sizeof(doa));
 
         doa.o_valid |= OBD_MD_FLGROUP;
-        doa.o_gr = oa->o_gr;
+        doa.o_seq = oa->o_seq;
         doa.o_mode = S_IFREG;
 
-        if (!test_bit(doa.o_gr, &filter->fo_destroys_in_progress)) {
+        if (!cfs_test_bit(doa.o_seq, &filter->fo_destroys_in_progress)) {
                 CERROR("%s:["LPU64"] destroys_in_progress already cleared\n",
-                       exp->exp_obd->obd_name, doa.o_gr);
+                       exp->exp_obd->obd_name, doa.o_seq);
                 RETURN(0);
         }
 
-        last = filter_last_id(filter, doa.o_gr);
+        last = filter_last_id(filter, doa.o_seq);
 
-        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;
-                rc = filter_destroy(exp, &doa, NULL, NULL, NULL);
+                rc = filter_destroy(exp, &doa, NULL, NULL, NULL, NULL);
                 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)
-                        filter_update_last_objid(exp->exp_obd, doa.o_gr, 0);
+                if ((id & 511) == 0 && !skip_orphan) {
+                        filter_set_last_id(filter, id - 1, doa.o_seq);
+                        filter_update_last_objid(exp->exp_obd, doa.o_seq, 0);
+                }
         }
 
         CDEBUG(D_HA, "%s: after destroy: set last_objids["LPU64"] = "LPU64"\n",
-               exp->exp_obd->obd_name, doa.o_gr, oa->o_id);
+               exp->exp_obd->obd_name, doa.o_seq, oa->o_id);
 
-        rc = filter_update_last_objid(exp->exp_obd, doa.o_gr, 1);
-        clear_bit(doa.o_gr, &filter->fo_destroys_in_progress);
+        if (!skip_orphan) {
+                filter_set_last_id(filter, id, doa.o_seq);
+                rc = filter_update_last_objid(exp->exp_obd, doa.o_seq, 1);
+        } else {
+                /*
+                 * We have destroyed orphan objects, but don't want to reuse
+                 * them. Therefore we don't reset last_id to the last created
+                 * objects. Instead, we report back to the MDS the object id
+                 * of the last orphan, so that the MDS can restart allocating
+                 * objects from this id + 1 and thus skip the whole orphan
+                 * object id range
+                 */
+                oa->o_id = last;
+                rc = 0;
+        }
+        cfs_clear_bit(doa.o_seq, &filter->fo_destroys_in_progress);
 
         RETURN(rc);
 }
 
 static int filter_precreate(struct obd_device *obd, struct obdo *oa,
-                            obd_gr group, int *num);
+                            obd_seq group, int *num);
 /* returns a negative error or a nonnegative number of files to create */
 static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
-                                   obd_gr group, struct obd_trans_info *oti)
+                                   obd_seq group, struct obd_trans_info *oti)
 {
         struct obd_device *obd = exp->exp_obd;
         struct filter_obd *filter = &obd->u.filter;
@@ -3456,28 +3568,30 @@ 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);
                         RETURN(0);
                 }
                 /* This causes inflight precreates to abort and drop lock */
-                set_bit(group, &filter->fo_destroys_in_progress);
-                down(&filter->fo_create_locks[group]);
-                if (!test_bit(group, &filter->fo_destroys_in_progress)) {
+                cfs_set_bit(group, &filter->fo_destroys_in_progress);
+                cfs_down(&filter->fo_create_locks[group]);
+                if (!cfs_test_bit(group, &filter->fo_destroys_in_progress)) {
                         CERROR("%s:["LPU64"] destroys_in_progress already cleared\n",
                                exp->exp_obd->obd_name, group);
-                        up(&filter->fo_create_locks[group]);
+                        cfs_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);
                 }
@@ -3489,17 +3603,17 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
                         GOTO(out, rc);
                 } else {
                         /* XXX: Used by MDS for the first time! */
-                        clear_bit(group, &filter->fo_destroys_in_progress);
+                        cfs_clear_bit(group, &filter->fo_destroys_in_progress);
                 }
         } else {
-                down(&filter->fo_create_locks[group]);
+                cfs_down(&filter->fo_create_locks[group]);
                 if (oti->oti_conn_cnt < exp->exp_conn_cnt) {
                         CERROR("%s: dropping old precreate request\n",
                                obd->obd_name);
                         GOTO(out, rc = 0);
                 }
                 /* only precreate if group == 0 and o_id is specfied */
-                if (group < FILTER_GROUP_MDS0 || oa->o_id == 0)
+                if (!fid_seq_is_mdt(group) || oa->o_id == 0)
                         diff = 1;
                 else
                         diff = oa->o_id - filter_last_id(filter, group);
@@ -3514,14 +3628,14 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
                 oa->o_id = filter_last_id(&obd->u.filter, group);
                 rc = filter_precreate(obd, oa, group, &diff);
                 oa->o_id = filter_last_id(&obd->u.filter, group);
-                oa->o_gr = group;
+                oa->o_seq = group;
                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
                 GOTO(out, rc);
         }
         /* else diff == 0 */
         GOTO(out, rc = 0);
 out:
-        up(&filter->fo_create_locks[group]);
+        cfs_up(&filter->fo_create_locks[group]);
         return rc;
 }
 
@@ -3536,10 +3650,10 @@ static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
         /* at least try to account for cached pages.  its still racey and
          * might be under-reporting if clients haven't announced their
          * caches with brw recently */
-        spin_lock(&obd->obd_osfs_lock);
+        cfs_spin_lock(&obd->obd_osfs_lock);
         rc = fsfilt_statfs(obd, obd->u.obt.obt_sb, max_age);
         memcpy(osfs, &obd->obd_osfs, sizeof(*osfs));
-        spin_unlock(&obd->obd_osfs_lock);
+        cfs_spin_unlock(&obd->obd_osfs_lock);
 
         CDEBUG(D_SUPER | D_CACHE, "blocks cached "LPU64" granted "LPU64
                " pending "LPU64" free "LPU64" avail "LPU64"\n",
@@ -3547,17 +3661,33 @@ static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
                filter->fo_tot_pending,
                osfs->os_bfree << blockbits, osfs->os_bavail << blockbits);
 
-        filter_grant_sanity_check(obd, __FUNCTION__);
+        filter_grant_sanity_check(obd, __func__);
 
         osfs->os_bavail -= min(osfs->os_bavail, GRANT_FOR_LLOG(obd) +
                                ((filter->fo_tot_dirty + filter->fo_tot_pending +
                                  osfs->os_bsize - 1) >> blockbits));
 
+        if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC)) {
+                struct lr_server_data *lsd = class_server_data(obd);
+                int index = le32_to_cpu(lsd->lsd_ost_index);
+
+                if (obd_fail_val == -1 ||
+                    index == obd_fail_val)
+                        osfs->os_bfree = osfs->os_bavail = 2;
+                else if (obd_fail_loc & OBD_FAIL_ONCE)
+                        obd_fail_loc &= ~OBD_FAILED; /* reset flag */
+        }
+
         /* set EROFS to state field if FS is mounted as RDONLY. The goal is to
          * 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;
+        osfs->os_state = 0;
+
+        if (filter->fo_obt.obt_sb->s_flags & MS_RDONLY)
+                osfs->os_state = OS_STATE_READONLY;
+
+        if (filter->fo_raid_degraded)
+                osfs->os_state |= OS_STATE_DEGRADED;
         RETURN(rc);
 }
 
@@ -3585,6 +3715,19 @@ 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;
+
+        cfs_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;
+        cfs_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.
@@ -3598,13 +3741,14 @@ static int filter_use_existing_obj(struct obd_device *obd,
  * Caller must hold fo_create_locks[group]
  */
 static int filter_precreate(struct obd_device *obd, struct obdo *oa,
-                            obd_gr group, int *num)
+                            obd_seq group, int *num)
 {
         struct dentry *dchild = NULL, *dparent = NULL;
         struct filter_obd *filter;
         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;
@@ -3622,11 +3766,13 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                 OBD_ALLOC(osfs, sizeof(*osfs));
                 if (osfs == NULL)
                         RETURN(-ENOMEM);
-                rc = filter_statfs(obd, osfs, cfs_time_current_64() - HZ, 0);
+                rc = filter_statfs(obd, osfs,
+                                   cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
+                                   0);
                 if (rc == 0 && osfs->os_bavail < (osfs->os_blocks >> 10)) {
                         CDEBUG(D_RPCTRACE,"%s: not enough space for create "
                                LPU64"\n", obd->obd_name, osfs->os_bavail <<
-                               filter->fo_vfsmnt->mnt_sb->s_blocksize_bits);
+                               obd->u.obt.obt_vfsmnt->mnt_sb->s_blocksize_bits);
                         *num = 0;
                         rc = -ENOSPC;
                 }
@@ -3641,7 +3787,7 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
         for (i = 0; i < *num && err == 0; i++) {
                 int cleanup_phase = 0;
 
-                if (test_bit(group, &filter->fo_destroys_in_progress)) {
+                if (cfs_test_bit(group, &filter->fo_destroys_in_progress)) {
                         CWARN("%s: create aborted by destroy\n",
                               obd->obd_name);
                         rc = -EAGAIN;
@@ -3661,7 +3807,13 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                 } else
                         next_id = filter_last_id(filter, group) + 1;
 
-                CDEBUG(D_INFO, "precreate objid "LPU64"\n", next_id);
+                /* Temporary solution for oid in CMD before fid-on-OST */
+                if ((fid_seq_is_mdt0(oa->o_seq) && next_id >= IDIF_MAX_OID) &&
+                    (fid_seq_is_cmd(oa->o_seq) && next_id >= OBIF_MAX_OID)) {
+                        CERROR("%s:"POSTID" hit the max IDIF_MAX_OID(1<<48)!\n",
+                                obd->obd_name, next_id, group);
+                        GOTO(cleanup, rc = -ENOSPC);
+                }
 
                 dparent = filter_parent_lock(obd, group, next_id);
                 if (IS_ERR(dparent))
@@ -3708,6 +3860,10 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                         GOTO(cleanup, rc = PTR_ERR(handle));
                 cleanup_phase = 3;
 
+                CDEBUG(D_INODE, "%s: filter_precreate(od->o_seq="LPU64
+                       ",od->o_id="LPU64")\n", obd->obd_name, group,
+                       next_id);
+
                 /* We mark object SUID+SGID to flag it for accepting UID+GID
                  * from client on first write.  Currently the permission bits
                  * on the OST are never used, so this is OK. */
@@ -3715,9 +3871,19 @@ 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);
@@ -3746,7 +3912,8 @@ set_last_id:
 
                 if (rc)
                         break;
-                if (time_after(jiffies, enough_time)) {
+                if (cfs_time_after(jiffies, enough_time)) {
+                        i++;
                         CDEBUG(D_RPCTRACE,
                                "%s: precreate slow - want %d got %d \n",
                                obd->obd_name, *num, i);
@@ -3756,44 +3923,38 @@ set_last_id:
         *num = i;
 
         CDEBUG(D_RPCTRACE,
-               "%s: created %d objects for group "LPU64": "LPU64" rc %d\n",
-               obd->obd_name, i, group, filter->fo_last_objids[group], rc);
+               "%s: created %d objects for group "POSTID" rc %d\n",
+               obd->obd_name, i, filter->fo_last_objids[group], group, rc);
 
         RETURN(rc);
 }
 
-static int filter_create(struct obd_export *exp, struct obdo *oa,
-                         struct lov_stripe_md **ea, struct obd_trans_info *oti)
+int filter_create(struct obd_export *exp, struct obdo *oa,
+                  struct lov_stripe_md **ea, struct obd_trans_info *oti)
 {
+        struct obd_device *obd = exp->exp_obd;
         struct filter_export_data *fed;
-        struct obd_device *obd = NULL;
         struct filter_obd *filter;
         struct lvfs_run_ctxt saved;
         struct lov_stripe_md *lsm = NULL;
-        int rc = 0, diff, group = oa->o_gr;
+        int rc = 0, diff;
         ENTRY;
 
-        if (!(oa->o_valid & OBD_MD_FLGROUP) || group == 0) {
-                CERROR("!!! nid %s sent invalid object group %d\n",
-                        obd_export_nid2str(exp), group);
-                RETURN(-EINVAL);
-        }
+        CDEBUG(D_INODE, "%s: filter_create(group="LPU64",id="
+               LPU64")\n", obd->obd_name, oa->o_seq, oa->o_id);
 
-        obd = exp->exp_obd;
         fed = &exp->exp_filter_data;
         filter = &obd->u.filter;
 
-        if (fed->fed_group != group) {
-                CERROR("!!! this export (nid %s) used object group %d "
-                        "earlier; now it's trying to use group %d!  This could "
-                        "be a bug in the MDS. Please report to "
-                        "http://bugzilla.lustre.org/\n",
-                        obd_export_nid2str(exp), fed->fed_group, group);
+        if (fed->fed_group != oa->o_seq) {
+                CERROR("%s: this export (nid %s) used object group %d "
+                        "earlier; now it's trying to use group "LPU64"!"
+                        " This could be a bug in the MDS. Please report to "
+                        "http://bugzilla.lustre.org/\n", obd->obd_name,
+                        obd_export_nid2str(exp), fed->fed_group, oa->o_seq);
                 RETURN(-ENOTUNIQ);
         }
 
-        CDEBUG(D_INFO, "filter_create(od->o_gr="LPU64",od->o_id="LPU64")\n",
-               oa->o_gr, oa->o_id);
         if (ea != NULL) {
                 lsm = *ea;
                 if (lsm == NULL) {
@@ -3808,19 +3969,19 @@ static int filter_create(struct obd_export *exp, struct obdo *oa,
 
         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
             (oa->o_flags & OBD_FL_RECREATE_OBJS)) {
-                if (oa->o_id > filter_last_id(filter, oa->o_gr)) {
+                if (!obd->obd_recovering ||
+                    oa->o_id > filter_last_id(filter, oa->o_seq)) {
                         CERROR("recreate objid "LPU64" > last id "LPU64"\n",
-                               oa->o_id, filter_last_id(filter,
-                                                        oa->o_gr));
+                               oa->o_id, filter_last_id(filter, oa->o_seq));
                         rc = -EINVAL;
                 } else {
                         diff = 1;
-                        down(&filter->fo_create_locks[oa->o_gr]);
-                        rc = filter_precreate(obd, oa, oa->o_gr, &diff);
-                        up(&filter->fo_create_locks[oa->o_gr]);
+                        cfs_down(&filter->fo_create_locks[oa->o_seq]);
+                        rc = filter_precreate(obd, oa, oa->o_seq, &diff);
+                        cfs_up(&filter->fo_create_locks[oa->o_seq]);
                 }
         } else {
-                rc = filter_handle_precreate(exp, oa, oa->o_gr, oti);
+                rc = filter_handle_precreate(exp, oa, oa->o_seq, oti);
         }
 
         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
@@ -3840,12 +4001,13 @@ static int filter_create(struct obd_export *exp, struct obdo *oa,
 
 int filter_destroy(struct obd_export *exp, struct obdo *oa,
                    struct lov_stripe_md *md, struct obd_trans_info *oti,
-                   struct obd_export *md_exp)
+                   struct obd_export *md_exp, void *capa)
 {
         unsigned int qcids[MAXQUOTAS] = {0, 0};
         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;
@@ -3853,7 +4015,10 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
         struct iattr iattr;
         ENTRY;
 
-        LASSERT(oa->o_valid & OBD_MD_FLGROUP);
+        rc = filter_auth_capa(exp, NULL, oa->o_seq,
+                              (struct lustre_capa *)capa, CAPA_OPC_OSS_DESTROY);
+        if (rc)
+                RETURN(rc);
 
         obd = exp->exp_obd;
         filter = &obd->u.filter;
@@ -3861,27 +4026,29 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
         cleanup_phase = 1;
 
-        dchild = filter_fid2dentry(obd, NULL, oa->o_gr, oa->o_id);
+        CDEBUG(D_INODE, "%s: filter_destroy(group="LPU64",oid="
+               LPU64")\n", obd->obd_name, oa->o_seq, oa->o_id);
+
+        dchild = filter_fid2dentry(obd, NULL, oa->o_seq, oa->o_id);
         if (IS_ERR(dchild))
                 GOTO(cleanup, rc = PTR_ERR(dchild));
         cleanup_phase = 2;
 
         if (dchild->d_inode == NULL) {
-                CDEBUG(D_INODE, "destroying non-existent object "LPU64"\n",
-                       oa->o_id);
+                CDEBUG(D_INODE, "destroying non-existent object "POSTID"\n",
+                       oa->o_id, oa->o_seq);
                 /* If object already gone, cancel cookie right now */
                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
                         struct llog_ctxt *ctxt;
                         struct obd_llog_group *olg;
-                        fcc = &oa->o_lcookie;
-                        olg = filter_find_olg(obd, oa->o_gr);
+
+                        olg = filter_find_olg(obd, oa->o_seq);
                         if (!olg) {
                                CERROR(" %s: can not find olg of group %d\n",
-                                      obd->obd_name, (int)oa->o_gr);
+                                      obd->obd_name, (int)oa->o_seq);
                                GOTO(cleanup, rc = PTR_ERR(olg));
                         }
-                        llog_group_set_export(olg, exp);
-
+                        fcc = &oa->o_lcookie;
                         ctxt = llog_group_get_ctxt(olg, fcc->lgc_subsys + 1);
                         llog_cancel(ctxt, NULL, 1, fcc, 0);
                         llog_ctxt_put(ctxt);
@@ -3890,7 +4057,9 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
                 GOTO(cleanup, rc = -ENOENT);
         }
 
-        filter_prepare_destroy(obd, oa->o_id, oa->o_gr);
+        rc = filter_prepare_destroy(obd, oa->o_id, oa->o_seq, &lockh);
+        if (rc)
+                GOTO(cleanup, rc);
 
         /* Our MDC connection is established by the MDS to us */
         if (oa->o_valid & OBD_MD_FLCOOKIE) {
@@ -3906,12 +4075,28 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
          * down(i_zombie)       down(i_zombie)
          *                      restart transaction
          * (see BUG 4180) -bzzz
+         *
+         * take i_alloc_sem too to prevent other threads from writing to the
+         * file while we are truncating it. This can cause lock ordering issue
+         * between page lock, i_mutex & starting new journal handle.
+         * (see bug 20321) -johann
          */
+        down_write(&dchild->d_inode->i_alloc_sem);
         LOCK_INODE_MUTEX(dchild->d_inode);
+
+        /* VBR: version recovery check */
+        rc = filter_version_get_check(exp, oti, dchild->d_inode);
+        if (rc) {
+                UNLOCK_INODE_MUTEX(dchild->d_inode);
+                up_write(&dchild->d_inode->i_alloc_sem);
+                GOTO(cleanup, rc);
+        }
+
         handle = fsfilt_start_log(obd, dchild->d_inode, FSFILT_OP_SETATTR,
                                   NULL, 1);
         if (IS_ERR(handle)) {
                 UNLOCK_INODE_MUTEX(dchild->d_inode);
+                up_write(&dchild->d_inode->i_alloc_sem);
                 GOTO(cleanup, rc = PTR_ERR(handle));
         }
 
@@ -3920,6 +4105,7 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
         rc = fsfilt_setattr(obd, dchild, handle, &iattr, 1);
         rc2 = fsfilt_commit(obd, dchild->d_inode, handle, 0);
         UNLOCK_INODE_MUTEX(dchild->d_inode);
+        up_write(&dchild->d_inode->i_alloc_sem);
         if (rc)
                 GOTO(cleanup, rc);
         if (rc2)
@@ -3929,7 +4115,7 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
          * here, and not while truncating above.  That avoids holding the
          * parent lock for a long time during truncate, which can block other
          * threads from doing anything to objects in that directory. bug 7171 */
-        dparent = filter_parent_lock(obd, oa->o_gr, oa->o_id);
+        dparent = filter_parent_lock(obd, oa->o_seq, oa->o_id);
         if (IS_ERR(dparent))
                 GOTO(cleanup, rc = PTR_ERR(dparent));
         cleanup_phase = 3; /* filter_parent_unlock */
@@ -3943,12 +4129,12 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
         cleanup_phase = 4; /* fsfilt_commit */
 
         /* Quota release need uid/gid of inode */
-        obdo_from_inode(oa, dchild->d_inode, OBD_MD_FLUID|OBD_MD_FLGID);
+        obdo_from_inode(oa, dchild->d_inode, NULL, OBD_MD_FLUID|OBD_MD_FLGID);
 
-        filter_fmd_drop(exp, oa->o_id, oa->o_gr);
+        filter_fmd_drop(exp, oa->o_id, oa->o_seq);
 
         /* this drops dchild->d_inode->i_mutex unconditionally */
-        rc = filter_destroy_internal(obd, oa->o_id, oa->o_gr, dparent, dchild);
+        rc = filter_destroy_internal(obd, oa->o_id, oa->o_seq, dparent, dchild);
 
         EXIT;
 cleanup:
@@ -3964,7 +4150,7 @@ 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;
@@ -3980,6 +4166,8 @@ 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));
@@ -3996,9 +4184,8 @@ cleanup:
         qcids[GRPQUOTA] = oa->o_gid;
         rc2 = lquota_adjust(filter_quota_interface_ref, obd, qcids, NULL, rc,
                             FSFILT_OP_UNLINK);
-
         if (rc2)
-                CDEBUG(D_QUOTA, "filter adjust qunit! (rc:%d)\n", rc2);
+                CERROR("filter adjust qunit! (rc:%d)\n", rc2);
         return rc;
 }
 
@@ -4017,16 +4204,13 @@ static int filter_truncate(struct obd_export *exp, struct obd_info *oinfo,
         }
 
         CDEBUG(D_INODE, "calling truncate for object "LPU64", valid = "LPX64
-               ", o_size = "LPD64"\n", oinfo->oi_oa->o_id,
-               oinfo->oi_oa->o_valid, oinfo->oi_policy.l_extent.start);
-
-        rc = filter_auth_capa(exp, NULL, oinfo_mdsno(oinfo),
-                              oinfo_capa(oinfo), CAPA_OPC_OSS_TRUNC);
-        if (rc)
-                RETURN(rc);
+               ", o_size = "LPD64"\n", oinfo->oi_oa->o_id,oinfo->oi_oa->o_valid,
+                oinfo->oi_policy.l_extent.start);
 
         oinfo->oi_oa->o_size = oinfo->oi_policy.l_extent.start;
+        oinfo->oi_oa->o_valid |= OBD_FL_TRUNC;
         rc = filter_setattr(exp, oinfo, oti);
+        oinfo->oi_oa->o_valid &= ~OBD_FL_TRUNC;
         RETURN(rc);
 }
 
@@ -4035,27 +4219,27 @@ static int filter_sync(struct obd_export *exp, struct obdo *oa,
                        void *capa)
 {
         struct lvfs_run_ctxt saved;
-        struct filter_obd *filter;
+        struct obd_device_target *obt;
         struct dentry *dentry;
         int rc, rc2;
         ENTRY;
 
-        rc = filter_auth_capa(exp, NULL, obdo_mdsno(oa),
+        rc = filter_auth_capa(exp, NULL, oa->o_seq,
                               (struct lustre_capa *)capa, CAPA_OPC_OSS_WRITE);
         if (rc)
                 RETURN(rc);
 
-        filter = &exp->exp_obd->u.filter;
+        obt = &exp->exp_obd->u.obt;
 
-        /* an objid of zero is taken to mean "sync whole filesystem" */
+        /* An objid of zero is taken to mean "sync whole filesystem" */
         if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
-                rc = fsfilt_sync(exp->exp_obd, filter->fo_obt.obt_sb);
-                /* flush any remaining cancel messages out to the target */
+                rc = fsfilt_sync(exp->exp_obd, obt->obt_sb);
+                /* Flush any remaining cancel messages out to the target */
                 filter_sync_llogs(exp->exp_obd, exp);
                 RETURN(rc);
         }
 
-        dentry = filter_oa2dentry(exp->exp_obd, oa);
+        dentry = filter_oa2dentry(exp->exp_obd, &oa->o_oi);
         if (IS_ERR(dentry))
                 RETURN(PTR_ERR(dentry));
 
@@ -4066,7 +4250,7 @@ static int filter_sync(struct obd_export *exp, struct obdo *oa,
         rc = filemap_fdatawrite(dentry->d_inode->i_mapping);
         if (rc == 0) {
                 /* just any file to grab fsync method - "file" arg unused */
-                struct file *file = filter->fo_rcvd_filp;
+                struct file *file = obt->obt_rcvd_filp;
 
                 if (file->f_op && file->f_op->fsync)
                         rc = file->f_op->fsync(NULL, dentry, 1);
@@ -4078,7 +4262,7 @@ static int filter_sync(struct obd_export *exp, struct obdo *oa,
         UNLOCK_INODE_MUTEX(dentry->d_inode);
 
         oa->o_valid = OBD_MD_FLID;
-        obdo_from_inode(oa, dentry->d_inode, FILTER_VALID_FLAGS);
+        obdo_from_inode(oa, dentry->d_inode, NULL, FILTER_VALID_FLAGS);
 
         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
 
@@ -4147,22 +4331,24 @@ static int filter_get_info(struct obd_export *exp, __u32 keylen,
                         RETURN(0);
                 }
 
-                dentry = __filter_oa2dentry(exp->exp_obd, &fm_key->oa,
-                                            __FUNCTION__, 1);
+                dentry = __filter_oa2dentry(exp->exp_obd, &fm_key->oa.o_oi,
+                                            __func__, 1);
                 if (IS_ERR(dentry))
                         RETURN(PTR_ERR(dentry));
 
                 memcpy(fiemap, &fm_key->fiemap, sizeof(*fiemap));
                 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);
-                }
+                rc = fsfilt_iocontrol(obd, dentry, FSFILT_IOC_FIEMAP,
+                                      (long)fiemap);
                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 
                 f_dput(dentry);
+                RETURN(rc);
+        }
+
+        if (KEY_IS(KEY_SYNC_LOCK_CANCEL)) {
+                *((__u32 *) val) = obd->u.filter.fo_sync_lock_cancel;
+                *vallen = sizeof(__u32);
                 RETURN(0);
         }
 
@@ -4170,14 +4356,82 @@ static int filter_get_info(struct obd_export *exp, __u32 keylen,
         RETURN(-EINVAL);
 }
 
+static inline int filter_setup_llog_group(struct obd_export *exp,
+                                          struct obd_device *obd,
+                                           int group)
+{
+        struct obd_llog_group *olg;
+        struct llog_ctxt *ctxt;
+        int rc;
+
+        olg = filter_find_create_olg(obd, group);
+        if (IS_ERR(olg))
+                RETURN(PTR_ERR(olg));
+
+        llog_group_set_export(olg, exp);
+
+        ctxt = llog_group_get_ctxt(olg, LLOG_MDS_OST_REPL_CTXT);
+        LASSERTF(ctxt != NULL, "ctxt is null\n");
+
+        rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
+        llog_ctxt_put(ctxt);
+        return rc;
+}
+
+static int filter_set_grant_shrink(struct obd_export *exp,
+                                   struct ost_body *body)
+{
+        /* handle shrink grant */
+        cfs_spin_lock(&exp->exp_obd->obd_osfs_lock);
+        filter_grant_incoming(exp, &body->oa);
+        cfs_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_SEQ_IS_MDT(group);
+        rc = filter_setup_llog_group(exp, obd, group);
+        if (rc)
+                goto out;
+
+        if (group == FID_SEQ_OST_MDT0) {
+                /* setup llog group 1 for interop */
+                filter_setup_llog_group(exp, obd, FID_SEQ_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;
-        struct obd_llog_group *olg;
-        struct llog_ctxt *ctxt;
-        int rc = 0, group;
         ENTRY;
 
         obd = exp->exp_obd;
@@ -4187,6 +4441,7 @@ 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);
@@ -4195,36 +4450,22 @@ static int filter_set_info_async(struct obd_export *exp, __u32 keylen,
 
         if (KEY_IS(KEY_REVIMP_UPD)) {
                 filter_revimp_update(exp);
+                lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
                 RETURN(0);
         }
 
-        if (!KEY_IS(KEY_MDS_CONN))
-                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 */
-        LASSERT(val != NULL);
-        group = (int)(*(__u32 *)val);
-        LASSERT(group >= FILTER_GROUP_MDS0);
-
-        olg = filter_find_create_olg(obd, group);
-        if (IS_ERR(olg))
-                RETURN(PTR_ERR(olg));
-
-        llog_group_set_export(olg, exp);
-
-        ctxt = llog_group_get_ctxt(olg, LLOG_MDS_OST_REPL_CTXT);
-        LASSERTF(ctxt != NULL, "ctxt is null\n");
+        if (KEY_IS(KEY_SPTLRPC_CONF)) {
+                filter_adapt_sptlrpc_conf(obd, 0);
+                RETURN(0);
+        }
 
-        rc = llog_receptor_accept(ctxt, exp->exp_imp_reverse);
-        llog_ctxt_put(ctxt);
+        if (KEY_IS(KEY_MDS_CONN))
+                RETURN(filter_set_mds_conn(exp, val));
 
-        lquota_setinfo(filter_quota_interface_ref, exp, obd);
+        if (KEY_IS(KEY_GRANT_SHRINK))
+                RETURN(filter_set_grant_shrink(exp, val));
 
-        RETURN(rc);
+        RETURN(-EINVAL);
 }
 
 int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
@@ -4236,7 +4477,7 @@ 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);
         }
@@ -4310,8 +4551,8 @@ static int filter_health_check(struct obd_device *obd)
                 rc = 1;
 
 #ifdef USE_HEALTH_CHECK_WRITE
-        LASSERT(filter->fo_health_check_filp != NULL);
-        rc |= !!lvfs_check_io_health(obd, filter->fo_health_check_filp);
+        LASSERT(filter->fo_obt.obt_health_check_filp != NULL);
+        rc |= !!lvfs_check_io_health(obd, filter->fo_obt.obt_health_check_filp);
 #endif
         return rc;
 }
@@ -4330,39 +4571,13 @@ static int filter_process_config(struct obd_device *obd, obd_count len,
         int rc = 0;
 
         switch (lcfg->lcfg_command) {
-        case LCFG_SPTLRPC_CONF: {
-                struct filter_obd       *filter = &obd->u.filter;
-                struct sptlrpc_conf_log *log;
-                struct sptlrpc_rule_set  tmp_rset;
-
-                log = sptlrpc_conf_log_extract(lcfg);
-                if (IS_ERR(log)) {
-                        rc = PTR_ERR(log);
-                        break;
-                }
-
-                sptlrpc_rule_set_init(&tmp_rset);
-
-                rc = sptlrpc_rule_set_from_log(&tmp_rset, log);
-                if (rc) {
-                        CERROR("obd %s: failed get sptlrpc rules: %d\n",
-                               obd->obd_name, rc);
-                        break;
-                }
-
-                write_lock(&filter->fo_sptlrpc_lock);
-                sptlrpc_rule_set_free(&filter->fo_sptlrpc_rset);
-                filter->fo_sptlrpc_rset = tmp_rset;
-                write_unlock(&filter->fo_sptlrpc_lock);
-
-                sptlrpc_target_update_exp_flavor(obd, &tmp_rset);
-                break;
-        }
         default:
                 lprocfs_filter_init_vars(&lvars);
 
                 rc = class_process_proc_param(PARAM_OST, lvars.obd_vars,
                                               lcfg, obd);
+                if (rc > 0)
+                        rc = 0;
                 break;
         }
 
@@ -4411,11 +4626,15 @@ extern quota_interface_t filter_quota_interface;
 static int __init obdfilter_init(void)
 {
         struct lprocfs_static_vars lvars;
-        int rc;
+        int rc, i;
+
+        /** sanity check for group<->mdsno conversion */
+        for (i = 0; i < MAX_MDT_COUNT; i++)
+                 LASSERT(objseq_to_mdsno(mdt_to_obd_objseq(i)) == i);
 
         lprocfs_filter_init_vars(&lvars);
 
-        request_module("lquota");
+        cfs_request_module("%s", "lquota");
         OBD_ALLOC(obdfilter_created_scratchpad,
                   OBDFILTER_CREATED_SCRATCHPAD_ENTRIES *
                   sizeof(*obdfilter_created_scratchpad));