Whamcloud - gitweb
LU-1201 checksum: add libcfs crypto hash
[fs/lustre-release.git] / lustre / obdfilter / filter.c
index 561872a..f365a2e 100644 (file)
@@ -1,6 +1,4 @@
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
  * GPL HEADER START
  *
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
@@ -28,6 +26,8 @@
 /*
  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Whamcloud, Inc.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -135,12 +135,12 @@ int filter_finish_transno(struct obd_export *exp, struct inode *inode,
         if (!exp->exp_obd->obd_replayable || oti == NULL)
                 RETURN(rc);
 
-        cfs_mutex_down(&ted->ted_lcd_lock);
+        cfs_mutex_lock(&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);
+                cfs_mutex_unlock(&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);
@@ -152,14 +152,25 @@ int filter_finish_transno(struct obd_export *exp, struct inode *inode,
         if (oti->oti_transno == 0) {
                 last_rcvd = le64_to_cpu(lsd->lsd_last_transno) + 1;
                 lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
+                LASSERT(last_rcvd >= le64_to_cpu(lcd->lcd_last_transno));
         } else {
                 last_rcvd = oti->oti_transno;
                 if (last_rcvd > le64_to_cpu(lsd->lsd_last_transno))
                         lsd->lsd_last_transno = cpu_to_le64(last_rcvd);
+                if (unlikely(last_rcvd < le64_to_cpu(lcd->lcd_last_transno))) {
+                        CERROR("Trying to overwrite bigger transno, on-disk: "
+                               LPU64", new: "LPU64"\n",
+                               le64_to_cpu(lcd->lcd_last_transno), last_rcvd);
+                        cfs_spin_lock(&exp->exp_lock);
+                        exp->exp_vbr_failed = 1;
+                        cfs_spin_unlock(&exp->exp_lock);
+                        cfs_spin_unlock(&obt->obt_lut->lut_translock);
+                        cfs_mutex_unlock(&ted->ted_lcd_lock);
+                        RETURN(-EOVERFLOW);
+                }
         }
         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);
@@ -196,7 +207,7 @@ int filter_finish_transno(struct obd_export *exp, struct inode *inode,
 
         CDEBUG(log_pri, "wrote trans "LPU64" for client %s at #%d: err = %d\n",
                last_rcvd, lcd->lcd_uuid, ted->ted_lr_idx, err);
-        cfs_mutex_up(&ted->ted_lcd_lock);
+        cfs_mutex_unlock(&ted->ted_lcd_lock);
         RETURN(rc);
 }
 
@@ -241,7 +252,6 @@ 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)
 {
         int rc, newnid = 0;
@@ -251,7 +261,7 @@ static int filter_export_stats_init(struct obd_device *obd,
                 /* Self-export gets no proc entry */
                 RETURN(0);
 
-        rc = lprocfs_exp_setup(exp, client_nid, reconnect, &newnid);
+        rc = lprocfs_exp_setup(exp, client_nid, &newnid);
         if (rc) {
                 /* Mask error for already created
                  * /proc entries */
@@ -290,7 +300,6 @@ static int filter_export_stats_init(struct obd_device *obd,
 
         RETURN(0);
  clean:
-        lprocfs_exp_cleanup(exp);
         return rc;
 }
 
@@ -343,7 +352,7 @@ static int filter_client_add(struct obd_device *obd, struct obd_export *exp,
         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);
+        cfs_mutex_init(&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",
@@ -444,12 +453,12 @@ static int filter_client_del(struct obd_export *exp)
          * 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);
+        cfs_mutex_lock(&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);
+        cfs_mutex_unlock(&ted->ted_lcd_lock);
         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
 
         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
@@ -636,17 +645,28 @@ static void filter_fmd_cleanup(struct obd_export *exp)
 static int filter_init_export(struct obd_export *exp)
 {
         int rc;
+        ENTRY;
+
         cfs_spin_lock_init(&exp->exp_filter_data.fed_lock);
         CFS_INIT_LIST_HEAD(&exp->exp_filter_data.fed_mod_list);
 
         cfs_spin_lock(&exp->exp_lock);
         exp->exp_connecting = 1;
         cfs_spin_unlock(&exp->exp_lock);
+
+        /* self-export doesn't need client data and ldlm initialization */
+        if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
+                                     &exp->exp_client_uuid)))
+                RETURN(0);
+
         rc = lut_client_alloc(exp);
         if (rc == 0)
                 rc = ldlm_init_export(exp);
+        if (rc)
+                CERROR("%s: Can't initialize export: rc %d\n",
+                       exp->exp_obd->obd_name, rc);
 
-        return rc;
+        RETURN(rc);
 }
 
 static int filter_free_server_data(struct obd_device_target *obt)
@@ -870,7 +890,7 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
                 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);
+                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);
@@ -881,9 +901,7 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
                 exp->exp_connecting = 0;
                 exp->exp_in_recovery = 0;
                 cfs_spin_unlock(&exp->exp_lock);
-                cfs_spin_lock_bh(&obd->obd_processing_task_lock);
                 obd->obd_max_recoverable_clients++;
-                cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
                 class_export_put(exp);
 
                 if (last_rcvd > le64_to_cpu(lsd->lsd_last_transno))
@@ -894,6 +912,7 @@ static int filter_init_server_data(struct obd_device *obd, struct file * filp)
         obd->obd_last_committed = le64_to_cpu(lsd->lsd_last_transno);
 out:
         obd->u.obt.obt_mount_count = mount_count + 1;
+        obd->u.obt.obt_instance = (__u32)obd->u.obt.obt_mount_count;
         lsd->lsd_mount_count = cpu_to_le64(obd->u.obt.obt_mount_count);
 
         /* save it, so mount count and last_transno is current */
@@ -1177,14 +1196,14 @@ 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;
 
-        cfs_down(&filter->fo_init_lock);
+        cfs_mutex_lock(&filter->fo_init_lock);
         old_count = filter->fo_group_count;
         for (group = old_count; group <= last_group; group++) {
                 rc = filter_read_group_internal(obd, group, create);
                 if (rc != 0)
                         break;
         }
-        cfs_up(&filter->fo_init_lock);
+        cfs_mutex_unlock(&filter->fo_init_lock);
         return rc;
 }
 
@@ -1198,12 +1217,12 @@ static int filter_prep_groups(struct obd_device *obd)
         loff_t off = 0;
         ENTRY;
 
-        O_dentry = simple_mkdir(current->fs->pwd, obd->u.obt.obt_vfsmnt,
+        O_dentry = simple_mkdir(cfs_fs_pwd(current->fs), obd->u.obt.obt_vfsmnt,
                                 "O", 0700, 1);
-        CDEBUG(D_INODE, "got/created O: %p\n", O_dentry);
+        CDEBUG(D_INODE, "%s: got/created O: %p\n", obd->obd_name, O_dentry);
         if (IS_ERR(O_dentry)) {
                 rc = PTR_ERR(O_dentry);
-                CERROR("cannot open/create O: rc = %d\n", rc);
+                CERROR("%s: cannot open/create O: rc = %d\n", obd->obd_name,rc);
                 GOTO(cleanup, rc);
         }
         filter->fo_dentry_O = O_dentry;
@@ -1213,22 +1232,24 @@ static int filter_prep_groups(struct obd_device *obd)
          * clients because they may send create/destroy for any group -bzzz */
         filp = filp_open("LAST_GROUP", O_CREAT | O_RDWR, 0700);
         if (IS_ERR(filp)) {
-                CERROR("cannot create LAST_GROUP: rc = %ld\n", PTR_ERR(filp));
+                CERROR("%s: cannot create LAST_GROUP: rc = %ld\n",
+                       obd->obd_name, PTR_ERR(filp));
                 GOTO(cleanup, rc = PTR_ERR(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);
+                CERROR("%s: error reading LAST_GROUP: rc %d\n",
+                       obd->obd_name, rc);
                 GOTO(cleanup, rc);
         }
 
         if (off == 0)
                 last_group = FID_SEQ_OST_MDT0;
 
-        CWARN("%s: initialize groups [%d,%d]\n", obd->obd_name,
-              FID_SEQ_OST_MDT0, last_group);
+        CDEBUG(D_INODE, "%s: initialize group %u (max %u)\n", obd->obd_name,
+               FID_SEQ_OST_MDT0, last_group);
         filter->fo_committed_group = last_group;
         rc = filter_read_groups(obd, last_group, 1);
         if (rc)
@@ -1409,7 +1430,9 @@ 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 >= filter->fo_group_count) /* FIXME: object groups */
+                return ERR_PTR(-EBADF);
 
         if (!fid_seq_is_mdt(group) || filter->fo_subdir_count == 0)
                 return filter->fo_dentry_O_groups[group];
@@ -1463,7 +1486,7 @@ struct dentry *filter_fid2dentry(struct obd_device *obd,
             obd->u.filter.fo_destroys_in_progress == 0) {
                 /* don't fail lookups for orphan recovery, it causes
                  * later LBUGs when objects still exist during precreate */
-                CDEBUG(D_INFO, "*** obd_fail_loc=%x ***\n",OBD_FAIL_OST_ENOENT);
+                CDEBUG(D_INFO, "*** cfs_fail_loc=%x ***\n",OBD_FAIL_OST_ENOENT);
                 RETURN(ERR_PTR(-ENOENT));
         }
         if (id == 0) {
@@ -1483,7 +1506,8 @@ struct dentry *filter_fid2dentry(struct obd_device *obd,
         }
         CDEBUG(D_INODE, "looking up object O/%.*s/%s\n",
                dparent->d_name.len, dparent->d_name.name, name);
-        dchild = /*ll_*/lookup_one_len(name, dparent, len);
+        /* dparent is already locked here, so we cannot use ll_lookup_one_len() */
+        dchild = lookup_one_len(name, dparent, len);
         if (dir_dentry == NULL)
                 filter_parent_unlock(dparent);
         if (IS_ERR(dchild)) {
@@ -1564,15 +1588,13 @@ int filter_vfs_unlink(struct inode *dir, struct dentry *dentry,
                 GOTO(out, rc = -EPERM);
 
         /* check_sticky() */
-        if ((dentry->d_inode->i_uid != current->fsuid &&
+        if ((dentry->d_inode->i_uid != cfs_curproc_fsuid() &&
              !cfs_capable(CFS_CAP_FOWNER)) || IS_APPEND(dentry->d_inode) ||
             IS_IMMUTABLE(dentry->d_inode))
                 GOTO(out, rc = -EPERM);
 
-        /* NOTE: This might need to go outside i_mutex, though it isn't clear if
-         *       that was done because of journal_start (which is already done
-         *       here) or some other ordering issue. */
-        DQUOT_INIT(dir);
+        /* Locking order: i_mutex -> journal_lock -> dqptr_sem. LU-952 */
+        ll_vfs_dq_init(dir);
 
         rc = ll_security_inode_unlink(dir, dentry, mnt);
         if (rc)
@@ -1598,7 +1620,10 @@ static int filter_destroy_internal(struct obd_device *obd, obd_id objid,
         struct inode *inode = dchild->d_inode;
         int rc;
 
-        if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 1) {
+        /* There should be 2 references to the inode:
+         *  1) taken by filter_prepare_destroy
+         *  2) taken by filter_destroy */
+        if (inode->i_nlink != 1 || atomic_read(&inode->i_count) != 2) {
                 CERROR("destroying objid %.*s ino %lu nlink %lu count %d\n",
                        dchild->d_name.len, dchild->d_name.name, inode->i_ino,
                        (unsigned long)inode->i_nlink,
@@ -1663,7 +1688,6 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
                                 struct ldlm_lock **lockp, void *req_cookie,
                                 ldlm_mode_t mode, int flags, void *data)
 {
-        CFS_LIST_HEAD(rpc_list);
         struct ptlrpc_request *req = req_cookie;
         struct ldlm_lock *lock = *lockp, *l = NULL;
         struct ldlm_resource *res = lock->l_resource;
@@ -1702,29 +1726,23 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
          * lock, and should not be granted if the lock will be blocked.
          */
 
-        LASSERT(ns == res->lr_namespace);
-        lock_res(res);
-        rc = policy(lock, &tmpflags, 0, &err, &rpc_list);
-        check_res_locked(res);
+        if (flags & LDLM_FL_BLOCK_NOWAIT) {
+                OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_AGL_DELAY, 5);
 
-        /* FIXME: we should change the policy function slightly, to not make
-         * this list at all, since we just turn around and free it */
-        while (!cfs_list_empty(&rpc_list)) {
-                struct ldlm_lock *wlock =
-                        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;
-                cfs_list_del_init(&wlock->l_cp_ast);
-                LDLM_LOCK_RELEASE(wlock);
+                if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_AGL_NOLOCK))
+                        RETURN(ELDLM_LOCK_ABORTED);
         }
 
+        LASSERT(ns == ldlm_res_to_ns(res));
+        lock_res(res);
+        rc = policy(lock, &tmpflags, 0, &err, NULL);
+        check_res_locked(res);
+
         /* The lock met with no resistance; we're finished. */
         if (rc == LDLM_ITER_CONTINUE) {
                 /* do not grant locks to the liblustre clients: they cannot
                  * handle ASTs robustly.  We need to do this while still
-                 * holding ns_lock to avoid the lock remaining on the res_link
+                 * holding lr_lock to avoid the lock remaining on the res_link
                  * list (and potentially being added to l_pending_list by an
                  * AST) when we are going to drop this lock ASAP. */
                 if (lock->l_export->exp_libclient ||
@@ -1736,6 +1754,12 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
                 }
                 unlock_res(res);
                 RETURN(err);
+        } else if (flags & LDLM_FL_BLOCK_NOWAIT) {
+                /* LDLM_FL_BLOCK_NOWAIT means it is for AGL. Do not send glimpse
+                 * callback for glimpse size. The real size user will trigger
+                 * the glimpse callback when necessary. */
+                unlock_res(res);
+                RETURN(ELDLM_LOCK_ABORTED);
         }
 
         /* Do not grant any lock, but instead send GL callbacks.  The extent
@@ -1747,11 +1771,11 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
         *reply_lvb = *res_lvb;
 
         /*
-         * ->ns_lock guarantees that no new locks are granted, and,
+         * lr_lock guarantees that no new locks are granted, and,
          * therefore, that res->lr_lvb_data cannot increase beyond the
          * end of already granted lock. As a result, it is safe to
          * check against "stale" reply_lvb->lvb_size value without
-         * res->lr_lvb_sem.
+         * res->lr_lvb_mutex.
          */
         arg.size = reply_lvb->lvb_size;
         arg.victim = &l;
@@ -1800,13 +1824,6 @@ static int filter_intent_policy(struct ldlm_namespace *ns,
 
         LASSERTF(l->l_glimpse_ast != NULL, "l == %p", l);
         rc = l->l_glimpse_ast(l, NULL); /* this will update the LVB */
-        /* Update the LVB from disk if the AST failed (this is a legal race) */
-        /*
-         * XXX nikita: situation when ldlm_server_glimpse_ast() failed before
-         * sending ast is not handled. This can result in lost client writes.
-         */
-        if (rc != 0)
-                ldlm_res_lvbo_update(res, NULL, 1);
 
         lock_res(res);
         *reply_lvb = *res_lvb;
@@ -1950,12 +1967,13 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
 {
         struct filter_obd *filter = &obd->u.filter;
         struct vfsmount *mnt;
+        struct file_system_type *type;
         struct lustre_mount_info *lmi;
         struct obd_uuid uuid;
         __u8 *uuid_ptr;
         char *str, *label;
         char ns_name[48];
-        request_queue_t *q;
+        struct request_queue *q;
         int rc, i;
         ENTRY;
 
@@ -1971,20 +1989,17 @@ 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");
-                mnt = ll_kern_mount(lustre_cfg_string(lcfg, 2),
-                                    MS_NOATIME|MS_NODIRATIME,
-                                    lustre_cfg_string(lcfg, 1), option);
+                type = get_fs_type(lustre_cfg_string(lcfg, 2));
+                if (!type) {
+                        CERROR("get_fs_type failed\n");
+                        RETURN(-ENODEV);
+                }
+                mnt = vfs_kern_mount(type, MS_NOATIME|MS_NODIRATIME,
+                                     lustre_cfg_string(lcfg, 1), option);
+                cfs_module_put(type->owner);
                 if (IS_ERR(mnt)) {
                         rc = PTR_ERR(mnt);
                         LCONSOLE_ERROR_MSG(0x135, "Can't mount disk %s (%d)\n",
@@ -2010,6 +2025,9 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
         /* failover is the default */
         obd->obd_replayable = 1;
 
+        /* disable connection until configuration finishes */
+        obd->obd_no_conn = 1;
+
         if (lcfg->lcfg_bufcount > 3 && LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
                 str = lustre_cfg_string(lcfg, 3);
                 if (strchr(str, 'n')) {
@@ -2018,13 +2036,15 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
                 }
         }
 
+        obd->u.obt.obt_magic = OBT_MAGIC;
         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);
 
-        fsfilt_setup(obd, obd->u.obt.obt_sb);
+        rc = fsfilt_setup(obd, obd->u.obt.obt_sb);
+        if (rc)
+                GOTO(err_ops, rc);
 
         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
         obd->obd_lvfs_ctxt.pwdmnt = mnt;
@@ -2032,16 +2052,17 @@ 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;
 
-        cfs_init_mutex(&filter->fo_init_lock);
+        cfs_mutex_init(&filter->fo_init_lock);
         filter->fo_committed_group = 0;
         filter->fo_destroys_in_progress = 0;
         for (i = 0; i < 32; i++)
-                cfs_sema_init(&filter->fo_create_locks[i], 1);
+                cfs_mutex_init(&filter->fo_create_locks[i]);
 
         cfs_spin_lock_init(&filter->fo_objidlock);
         CFS_INIT_LIST_HEAD(&filter->fo_export_list);
-        cfs_sema_init(&filter->fo_alloc_lock, 1);
+        cfs_mutex_init(&filter->fo_alloc_lock);
         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 = 1; /* enable writethrough cache */
         filter->fo_readcache_max_filesize = FILTER_MAX_CACHE_SIZE;
@@ -2065,8 +2086,10 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
                 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,
-                                                LDLM_NAMESPACE_GREEDY);
+        obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
+                                                LDLM_NAMESPACE_SERVER,
+                                                LDLM_NAMESPACE_GREEDY,
+                                                LDLM_NS_TYPE_OST);
         if (obd->obd_namespace == NULL)
                 GOTO(err_post, rc = -ENOMEM);
         obd->obd_namespace->ns_lvbp = obd;
@@ -2092,13 +2115,13 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
                 GOTO(err_post, rc);
 
         q = bdev_get_queue(mnt->mnt_sb->s_bdev);
-        if (q->max_sectors < q->max_hw_sectors &&
-            q->max_sectors < PTLRPC_MAX_BRW_SIZE >> 9)
+        if (queue_max_sectors(q) < queue_max_hw_sectors(q) &&
+            queue_max_sectors(q) < PTLRPC_MAX_BRW_SIZE >> 9)
                 LCONSOLE_INFO("%s: underlying device %s should be tuned "
                               "for larger I/O requests: max_sectors = %u "
                               "could be up to max_hw_sectors=%u\n",
                               obd->obd_name, mnt->mnt_sb->s_id,
-                              q->max_sectors, q->max_hw_sectors);
+                              queue_max_sectors(q), queue_max_hw_sectors(q));
 
         uuid_ptr = fsfilt_uuid(obd, obd->u.obt.obt_sb);
         if (uuid_ptr != NULL) {
@@ -2114,17 +2137,6 @@ int filter_common_setup(struct obd_device *obd, struct lustre_cfg* lcfg,
                       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_max_recoverable_clients == 1) ? "s": "");
-
-
         RETURN(0);
 
 err_post:
@@ -2141,9 +2153,11 @@ err_mntput:
 static int filter_setup(struct obd_device *obd, struct lustre_cfg* lcfg)
 {
         struct lprocfs_static_vars lvars;
+        cfs_proc_dir_entry_t *entry;
         unsigned long addr;
         struct page *page;
         int rc;
+        ENTRY;
 
         CLASSERT(offsetof(struct obd_device, u.obt) ==
                  offsetof(struct obd_device, u.filter.fo_obt));
@@ -2151,69 +2165,96 @@ static int filter_setup(struct obd_device *obd, struct lustre_cfg* lcfg)
         if (!LUSTRE_CFG_BUFLEN(lcfg, 1) || !LUSTRE_CFG_BUFLEN(lcfg, 2))
                 RETURN(-EINVAL);
 
-        /* 2.6.9 selinux wants a full option page for do_kern_mount (bug6471) */
-        OBD_PAGE_ALLOC(page, CFS_ALLOC_STD);
-        if (!page)
-                RETURN(-ENOMEM);
-        addr = (unsigned long)cfs_page_address(page);
-        clear_page((void *)addr);
-
         /* lprocfs must be setup before the filter so state can be safely added
          * to /proc incrementally as the filter is setup */
         lprocfs_filter_init_vars(&lvars);
-        if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0 &&
-            lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST) == 0) {
-                /* Init obdfilter private stats here */
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
-                                     LPROCFS_CNTR_AVGMINMAX,
-                                     "read_bytes", "bytes");
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
-                                     LPROCFS_CNTR_AVGMINMAX,
-                                     "write_bytes", "bytes");
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_GET_PAGE,
-                                     LPROCFS_CNTR_AVGMINMAX|LPROCFS_CNTR_STDDEV,
-                                     "get_page", "usec");
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_NO_PAGE,
-                                     LPROCFS_CNTR_AVGMINMAX,
-                                     "get_page_failures", "num");
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_ACCESS,
-                                     LPROCFS_CNTR_AVGMINMAX,
-                                     "cache_access", "pages");
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_HIT,
-                                     LPROCFS_CNTR_AVGMINMAX,
-                                     "cache_hit", "pages");
-                lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_MISS,
-                                     LPROCFS_CNTR_AVGMINMAX,
-                                     "cache_miss", "pages");
-
-                lproc_filter_attach_seqstat(obd);
-                obd->obd_proc_exports_entry = lprocfs_register("exports",
-                                                        obd->obd_proc_entry,
-                                                        NULL, NULL);
-                if (IS_ERR(obd->obd_proc_exports_entry)) {
-                        rc = PTR_ERR(obd->obd_proc_exports_entry);
-                        CERROR("error %d setting up lprocfs for %s\n",
-                               rc, "exports");
-                        obd->obd_proc_exports_entry = NULL;
-                }
+        rc = lprocfs_obd_setup(obd, lvars.obd_vars);
+        if (rc) {
+                CERROR("%s: lprocfs_obd_setup failed: %d.\n",
+                       obd->obd_name, rc);
+                RETURN(rc);
+        }
+
+        rc = lprocfs_alloc_obd_stats(obd, LPROC_FILTER_LAST);
+        if (rc) {
+                CERROR("%s: lprocfs_alloc_obd_stats failed: %d.\n",
+                       obd->obd_name, rc);
+                GOTO(obd_cleanup, rc);
         }
-        if (obd->obd_proc_exports_entry)
-                lprocfs_add_simple(obd->obd_proc_exports_entry, "clear",
+
+        /* Init obdfilter private stats here */
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_READ_BYTES,
+                             LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_WRITE_BYTES,
+                             LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_GET_PAGE,
+                             LPROCFS_CNTR_AVGMINMAX|LPROCFS_CNTR_STDDEV,
+                             "get_page", "usec");
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_NO_PAGE,
+                             LPROCFS_CNTR_AVGMINMAX, "get_page_failures", "num");
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_ACCESS,
+                             LPROCFS_CNTR_AVGMINMAX, "cache_access", "pages");
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_HIT,
+                             LPROCFS_CNTR_AVGMINMAX, "cache_hit", "pages");
+        lprocfs_counter_init(obd->obd_stats, LPROC_FILTER_CACHE_MISS,
+                             LPROCFS_CNTR_AVGMINMAX, "cache_miss", "pages");
+
+        rc = lproc_filter_attach_seqstat(obd);
+        if (rc) {
+                CERROR("%s: create seqstat failed: %d.\n", obd->obd_name, rc);
+                GOTO(free_obd_stats, rc);
+        }
+
+        entry = lprocfs_register("exports", obd->obd_proc_entry, NULL, NULL);
+        if (IS_ERR(entry)) {
+                rc = PTR_ERR(entry);
+                CERROR("%s: error %d setting up lprocfs for %s\n",
+                       obd->obd_name, rc, "exports");
+                GOTO(free_obd_stats, rc);
+        }
+        obd->obd_proc_exports_entry = entry;
+
+        entry = lprocfs_add_simple(obd->obd_proc_exports_entry, "clear",
                                    lprocfs_nid_stats_clear_read,
                                    lprocfs_nid_stats_clear_write, obd, NULL);
+        if (IS_ERR(entry)) {
+                rc = PTR_ERR(entry);
+                CERROR("%s: add proc entry 'clear' failed: %d.\n",
+                       obd->obd_name, rc);
+                GOTO(free_obd_stats, rc);
+        }
+
+       rc = lprocfs_job_stats_init(obd, LPROC_FILTER_STATS_LAST,
+                                   filter_stats_counter_init);
+       if (rc)
+               GOTO(remove_entry_clear, rc);
 
+        /* 2.6.9 selinux wants a full option page for do_kern_mount (bug6471) */
+        OBD_PAGE_ALLOC(page, CFS_ALLOC_STD);
+        if (!page)
+               GOTO(job_stats_fini, rc = -ENOMEM);
+        addr = (unsigned long)cfs_page_address(page);
+        clear_page((void *)addr);
         memcpy((void *)addr, lustre_cfg_buf(lcfg, 4),
                LUSTRE_CFG_BUFLEN(lcfg, 4));
         rc = filter_common_setup(obd, lcfg, (void *)addr);
         OBD_PAGE_FREE(page);
-
         if (rc) {
-                lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
-                lprocfs_free_per_client_stats(obd);
-                lprocfs_free_obd_stats(obd);
-                lprocfs_obd_cleanup(obd);
+                CERROR("%s: filter_common_setup failed: %d.\n",
+                       obd->obd_name, rc);
+               GOTO(job_stats_fini, rc);
         }
 
+        RETURN(0);
+
+job_stats_fini:
+       lprocfs_job_stats_fini(obd);
+remove_entry_clear:
+        lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
+free_obd_stats:
+        lprocfs_free_obd_stats(obd);
+obd_cleanup:
+        lprocfs_obd_cleanup(obd);
         return rc;
 }
 
@@ -2374,20 +2415,20 @@ static int filter_llog_finish(struct obd_device *obd, int count)
                  * This is safe to do, as llog is already synchronized
                  * and its import may go.
                  */
-                cfs_mutex_down(&ctxt->loc_sem);
+                cfs_mutex_lock(&ctxt->loc_mutex);
                 if (ctxt->loc_imp) {
                         class_import_put(ctxt->loc_imp);
                         ctxt->loc_imp = NULL;
                 }
-                cfs_mutex_up(&ctxt->loc_sem);
+                cfs_mutex_unlock(&ctxt->loc_mutex);
                 llog_ctxt_put(ctxt);
         }
 
         if (filter->fo_lcm) {
-                cfs_mutex_down(&ctxt->loc_sem);
+                cfs_mutex_lock(&ctxt->loc_mutex);
                 llog_recov_thread_fini(filter->fo_lcm, obd->obd_force);
                 filter->fo_lcm = NULL;
-                cfs_mutex_up(&ctxt->loc_sem);
+                cfs_mutex_unlock(&ctxt->loc_mutex);
         }
         RETURN(filter_olg_fini(&obd->obd_olg));
 }
@@ -2434,7 +2475,7 @@ struct obd_llog_group *filter_find_olg(struct obd_device *obd, int group)
  */
 struct obd_llog_group *filter_find_create_olg(struct obd_device *obd, int group)
 {
-        struct obd_llog_group *olg = NULL;
+        struct obd_llog_group *olg = NULL, *olg_new = NULL;
         struct filter_obd *filter;
         int rc;
 
@@ -2443,6 +2484,10 @@ struct obd_llog_group *filter_find_create_olg(struct obd_device *obd, int group)
         if (group == FID_SEQ_LLOG)
                 RETURN(&obd->obd_olg);
 
+        OBD_ALLOC_PTR(olg_new);
+        if (olg_new == NULL)
+               RETURN(ERR_PTR(-ENOMEM));
+
         cfs_spin_lock(&filter->fo_llog_list_lock);
         olg = filter_find_olg_internal(filter, group);
         if (olg) {
@@ -2451,10 +2496,11 @@ struct obd_llog_group *filter_find_create_olg(struct obd_device *obd, int group)
                 } else {
                         GOTO(out_unlock, olg);
                 }
+        } else {
+                /* set as the newly allocated one */
+                olg = olg_new;
+                olg_new = NULL;
         }
-        OBD_ALLOC_PTR(olg);
-        if (olg == NULL)
-               GOTO(out_unlock, olg = ERR_PTR(-ENOMEM));
 
         llog_group_init(olg, group);
         cfs_list_add(&olg->olg_list, &filter->fo_llog_list);
@@ -2479,7 +2525,9 @@ out:
 
 out_unlock:
         cfs_spin_unlock(&filter->fo_llog_list_lock);
-        GOTO(out, olg);
+        if (olg_new)
+               OBD_FREE_PTR(olg_new);
+        goto out;
 }
 
 static int filter_llog_connect(struct obd_export *exp,
@@ -2507,13 +2555,13 @@ static int filter_llog_connect(struct obd_export *exp,
         LASSERTF(ctxt != NULL, "ctxt is not null, ctxt idx %d \n",
                  body->lgdc_ctxt_idx);
 
-        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);
+        CDEBUG(D_HA, "%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_bh(&obd->obd_processing_task_lock);
+        cfs_spin_lock(&obd->u.filter.fo_flags_lock);
         obd->u.filter.fo_mds_ost_sync = 1;
-        cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
+        cfs_spin_unlock(&obd->u.filter.fo_flags_lock);
         rc = llog_connect(ctxt, &body->lgdc_logid,
                           &body->lgdc_gen, NULL);
         llog_ctxt_put(ctxt);
@@ -2572,7 +2620,17 @@ static int filter_precleanup(struct obd_device *obd,
         case OBD_CLEANUP_EXPORTS:
                 /* Stop recovery before namespace cleanup. */
                 target_recovery_fini(obd);
+
+                obd_exports_barrier(obd);
+                obd_zombie_barrier();
+
                 rc = filter_llog_preclean(obd);
+               lprocfs_job_stats_fini(obd);
+                lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
+                lprocfs_free_per_client_stats(obd);
+                lprocfs_obd_cleanup(obd);
+                lprocfs_free_obd_stats(obd);
+                lquota_cleanup(filter_quota_interface_ref, obd);
                 break;
         }
         RETURN(rc);
@@ -2587,15 +2645,6 @@ static int filter_cleanup(struct obd_device *obd)
                 LCONSOLE_WARN("%s: shutting down for failover; client state "
                               "will be preserved.\n", obd->obd_name);
 
-        obd_exports_barrier(obd);
-        obd_zombie_barrier();
-
-        lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
-        lprocfs_free_per_client_stats(obd);
-        lprocfs_free_obd_stats(obd);
-        lprocfs_obd_cleanup(obd);
-        lquota_cleanup(filter_quota_interface_ref, obd);
-
         ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
         obd->obd_namespace = NULL;
 
@@ -2606,7 +2655,7 @@ static int filter_cleanup(struct obd_device *obd)
 
         filter_post(obd);
 
-        LL_DQUOT_OFF(obd->u.obt.obt_sb);
+        ll_vfs_dq_off(obd->u.obt.obt_sb, 0);
         shrink_dcache_sb(obd->u.obt.obt_sb);
 
         server_put_mount(obd->obd_name, obd->u.obt.obt_vfsmnt);
@@ -2640,7 +2689,7 @@ static int filter_connect_internal(struct obd_export *exp,
                 CWARN("!!! 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",
+                       "http://bugs.whamcloud.com/\n",
                        obd_export_nid2str(exp), fed->fed_group,data->ocd_group);
                 RETURN(-EPROTO);
         }
@@ -2651,8 +2700,10 @@ static int filter_connect_internal(struct obd_export *exp,
         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))
+        if (data->ocd_connect_flags & OBD_CONNECT_MDS)
+                CDEBUG(D_HA, "%s: Received MDS connection for group %u\n",
+                       exp->exp_obd->obd_name, data->ocd_group);
+        else if (data->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN)
                 RETURN(-EPROTO);
 
         if (exp->exp_connect_flags & OBD_CONNECT_GRANT) {
@@ -2706,7 +2757,18 @@ static int filter_connect_internal(struct obd_export *exp,
         } else if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
                 data->ocd_brw_size = min(data->ocd_brw_size,
                                (__u32)(PTLRPC_MAX_BRW_PAGES << CFS_PAGE_SHIFT));
-                LASSERT(data->ocd_brw_size);
+                if (data->ocd_brw_size == 0) {
+                        CERROR("%s: cli %s/%p ocd_connect_flags: "LPX64
+                               " ocd_version: %x ocd_grant: %d ocd_index: %u "
+                               "ocd_brw_size is unexpectedly zero, "
+                               "network data corruption?"
+                               "Refusing connection of this client\n",
+                                exp->exp_obd->obd_name,
+                                exp->exp_client_uuid.uuid,
+                                exp, data->ocd_connect_flags, data->ocd_version,
+                                data->ocd_grant, data->ocd_index);
+                        RETURN(-EPROTO);
+                }
         }
 
         if (data->ocd_connect_flags & OBD_CONNECT_CKSUM) {
@@ -2715,10 +2777,9 @@ static int filter_connect_internal(struct obd_export *exp,
                 /* The client set in ocd_cksum_types the checksum types it
                  * supports. We have to mask off the algorithms that we don't
                  * support */
-                if (cksum_types & OBD_CKSUM_ALL)
-                        data->ocd_cksum_types &= OBD_CKSUM_ALL;
-                else
-                        data->ocd_cksum_types = OBD_CKSUM_CRC32;
+               data->ocd_cksum_types &= cksum_types_supported_server();
+
+               /* 1.6.4 clients are not supported any more */
 
                 CDEBUG(D_RPCTRACE, "%s: cli %s supports cksum type %x, return "
                                    "%x\n", exp->exp_obd->obd_name,
@@ -2733,6 +2794,9 @@ static int filter_connect_internal(struct obd_export *exp,
                                    obd_export_nid2str(exp));
         }
 
+        if (data->ocd_connect_flags & OBD_CONNECT_MAXBYTES)
+                data->ocd_maxbytes = exp->exp_obd->u.obt.obt_sb->s_maxbytes;
+
         RETURN(0);
 }
 
@@ -2750,12 +2814,11 @@ static int filter_reconnect(const struct lu_env *env,
 
         rc = filter_connect_internal(exp, data, 1);
         if (rc == 0)
-                filter_export_stats_init(obd, exp, 1, localdata);
+                filter_export_stats_init(obd, exp, localdata);
 
         RETURN(rc);
 }
 
-/* nearly identical to mds_connect */
 static int filter_connect(const struct lu_env *env,
                           struct obd_export **exp, struct obd_device *obd,
                           struct obd_uuid *cluuid,
@@ -2764,7 +2827,6 @@ static int filter_connect(const struct lu_env *env,
         struct lvfs_run_ctxt saved;
         struct lustre_handle conn = { 0 };
         struct obd_export *lexp;
-        __u32 group;
         int rc;
         ENTRY;
 
@@ -2781,7 +2843,7 @@ static int filter_connect(const struct lu_env *env,
         if (rc)
                 GOTO(cleanup, rc);
 
-        filter_export_stats_init(obd, lexp, 0, localdata);
+        filter_export_stats_init(obd, lexp, localdata);
         if (obd->obd_replayable) {
                 struct lsd_client_data *lcd = lexp->exp_target_data.ted_lcd;
                 LASSERT(lcd);
@@ -2791,16 +2853,11 @@ static int filter_connect(const struct lu_env *env,
                         GOTO(cleanup, rc);
         }
 
-        group = data->ocd_group;
-
-        CWARN("%s: Received MDS connection ("LPX64"); group %d\n",
-              obd->obd_name, lexp->exp_handle.h_cookie, group);
-
         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
-        rc = filter_read_groups(obd, group, 1);
+        rc = filter_read_groups(obd, data->ocd_group, 1);
         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
         if (rc != 0) {
-                CERROR("can't read group %u\n", group);
+                CERROR("can't read group %u\n", data->ocd_group);
                 GOTO(cleanup, rc);
         }
 
@@ -2809,7 +2866,6 @@ static int filter_connect(const struct lu_env *env,
 cleanup:
         if (rc) {
                 class_disconnect(lexp);
-                lprocfs_exp_cleanup(lexp);
                 *exp = NULL;
         } else {
                 *exp = lexp;
@@ -2939,12 +2995,14 @@ static int filter_destroy_export(struct obd_export *exp)
         lquota_clearinfo(filter_quota_interface_ref, exp, exp->exp_obd);
 
         target_destroy_export(exp);
+
+        if (unlikely(obd_uuid_equals(&exp->exp_obd->obd_uuid,
+                                     &exp->exp_client_uuid)))
+               RETURN(0);
+
         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)
                 fsfilt_sync(exp->exp_obd, exp->exp_obd->u.obt.obt_sb);
 
@@ -3062,7 +3120,7 @@ static void filter_revimp_update(struct obd_export *exp)
         EXIT;
 }
 
-static int filter_ping(struct obd_export *exp)
+static int filter_ping(const struct lu_env *env, struct obd_export *exp)
 {
         filter_fmd_expire(exp);
         return 0;
@@ -3089,13 +3147,31 @@ struct dentry *__filter_oa2dentry(struct obd_device *obd, struct ost_id *ostid,
                 RETURN(ERR_PTR(-ENOENT));
         }
 
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2,7,50,0)
+        /* Try to correct for a bug in 2.1.0 (LU-221) that caused negative
+         * timestamps to appear to be in the far future, due old timestamp
+         * being stored on disk as an unsigned value.  This fixes up any
+         * bad values stored on disk before returning them to the client,
+         * and ensures any timestamp updates are correct.  LU-1042 */
+        if (unlikely(LTIME_S(dchild->d_inode->i_atime) == LU221_BAD_TIME))
+                LTIME_S(dchild->d_inode->i_atime) = 0;
+        if (unlikely(LTIME_S(dchild->d_inode->i_mtime) == LU221_BAD_TIME))
+                LTIME_S(dchild->d_inode->i_mtime) = 0;
+        if (unlikely(LTIME_S(dchild->d_inode->i_ctime) == LU221_BAD_TIME))
+                LTIME_S(dchild->d_inode->i_ctime) = 0;
+#else
+#warning "remove old LU-221/LU-1042 workaround code"
+#endif
+
         return dchild;
 }
 
-static int filter_getattr(struct obd_export *exp, struct obd_info *oinfo)
+static int filter_getattr(const struct lu_env *env, struct obd_export *exp,
+                          struct obd_info *oinfo)
 {
         struct dentry *dentry = NULL;
         struct obd_device *obd;
+        __u64 curr_version;
         int rc = 0;
         ENTRY;
 
@@ -3116,7 +3192,14 @@ static int filter_getattr(struct obd_export *exp, struct obd_info *oinfo)
 
         /* 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, NULL, FILTER_VALID_FLAGS);
+        obdo_from_inode(oinfo->oi_oa, dentry->d_inode, FILTER_VALID_FLAGS);
+
+        /* Store inode version in reply */
+        curr_version = fsfilt_get_version(exp->exp_obd, dentry->d_inode);
+        if ((__s64)curr_version != -EOPNOTSUPP) {
+                oinfo->oi_oa->o_valid |= OBD_MD_FLDATAVERSION;
+                oinfo->oi_oa->o_data_version = curr_version;
+        }
 
         f_dput(dentry);
         RETURN(rc);
@@ -3193,13 +3276,14 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
                         *fcc = oa->o_lcookie;
         }
         if (ia_valid & (ATTR_SIZE | ATTR_UID | ATTR_GID)) {
-                DQUOT_INIT(inode);
+                unsigned long now = jiffies;
                 /* 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);
+                fsfilt_check_slow(exp->exp_obd, now, "i_alloc_sem and i_mutex");
                 old_size = i_size_read(inode);
         }
 
@@ -3262,6 +3346,11 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
                 if (IS_ERR(handle))
                         GOTO(out_unlock, rc = PTR_ERR(handle));
         }
+
+        /* Locking order: i_mutex -> journal_lock -> dqptr_sem. LU-952 */
+        if (ia_valid & (ATTR_SIZE | ATTR_UID | ATTR_GID))
+                ll_vfs_dq_init(inode);
+
         if (oa->o_valid & OBD_MD_FLFLAGS) {
                 rc = fsfilt_iocontrol(exp->exp_obd, dentry,
                                       FSFILT_IOC_SETFLAGS, (long)&oa->o_flags);
@@ -3281,7 +3370,10 @@ int filter_setattr_internal(struct obd_export *exp, struct dentry *dentry,
         * 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, inode, oti, rc, sync);
+        /* Update inode version only if data has changed => size has changed */
+        rc = filter_finish_transno(exp, ia_valid & ATTR_SIZE ? inode : NULL,
+                                   oti, rc, sync);
+
         if (sync) {
                 filter_cancel_cookies_cb(exp->exp_obd, 0, fcc, rc);
                 fcc = NULL;
@@ -3332,8 +3424,8 @@ out_unlock:
 }
 
 /* this is called from filter_truncate() until we have filter_punch() */
-int filter_setattr(struct obd_export *exp, struct obd_info *oinfo,
-                   struct obd_trans_info *oti)
+int filter_setattr(const struct lu_env *env, 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);
@@ -3347,7 +3439,7 @@ int filter_setattr(struct obd_export *exp, struct obd_info *oinfo,
         int rc;
         ENTRY;
 
-        if (oa->o_valid & OBD_FL_TRUNC)
+        if (oinfo->oi_flags & OBD_FL_PUNCH)
                 opc |= CAPA_OPC_OSS_TRUNC;
 
         rc = filter_auth_capa(exp, NULL, oa->o_seq, capa, opc);
@@ -3396,7 +3488,9 @@ int filter_setattr(struct obd_export *exp, struct obd_info *oinfo,
          */
         if (oa->o_valid &
             (OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME)) {
+                unsigned long now = jiffies;
                 down_write(&dentry->d_inode->i_alloc_sem);
+                fsfilt_check_slow(exp->exp_obd, now, "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;
@@ -3422,9 +3516,11 @@ int filter_setattr(struct obd_export *exp, struct obd_info *oinfo,
         oa->o_valid = OBD_MD_FLID;
 
         /* Quota release need uid/gid info */
-        obdo_from_inode(oa, dentry->d_inode, NULL,
+        obdo_from_inode(oa, dentry->d_inode,
                         FILTER_VALID_FLAGS | OBD_MD_FLUID | OBD_MD_FLGID);
 
+       filter_counter_incr(exp, LPROC_FILTER_STATS_SETATTR,
+                           oti ? oti->oti_jobid : NULL, 1);
         EXIT;
 out_unlock:
         f_dput(dentry);
@@ -3483,7 +3579,7 @@ static int filter_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
                 LASSERT((*lsmp)->lsm_object_id);
         }
 
-        (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
+        (*lsmp)->lsm_maxbytes = exp->exp_obd->u.obt.obt_sb->s_maxbytes;
 
         RETURN(lsm_size);
 }
@@ -3498,7 +3594,7 @@ static int filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
         int skip_orphan;
         ENTRY;
 
-        LASSERT(down_trylock(&filter->fo_create_locks[oa->o_seq]) != 0);
+        LASSERT_MUTEX_LOCKED(&filter->fo_create_locks[oa->o_seq]);
 
         memset(&doa, 0, sizeof(doa));
 
@@ -3522,7 +3618,7 @@ static int filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
 
         for (id = last; id > oa->o_id; id--) {
                 doa.o_id = id;
-                rc = filter_destroy(exp, &doa, NULL, NULL, NULL, NULL);
+                rc = filter_destroy(NULL, exp, &doa, NULL, NULL, NULL, NULL);
                 if (rc && rc != -ENOENT) /* this is pretty fatal... */
                         CEMERG("error destroying precreate objid "LPU64": %d\n",
                                id, rc);
@@ -3542,7 +3638,14 @@ static int filter_destroy_precreated(struct obd_export *exp, struct obdo *oa,
                 filter_set_last_id(filter, id, doa.o_seq);
                 rc = filter_update_last_objid(exp->exp_obd, doa.o_seq, 1);
         } else {
-                /* don't reuse orphan object, return last used objid */
+                /*
+                 * 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;
         }
@@ -3573,18 +3676,18 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
                 }
                 /* This causes inflight precreates to abort and drop lock */
                 cfs_set_bit(group, &filter->fo_destroys_in_progress);
-                cfs_down(&filter->fo_create_locks[group]);
+                cfs_mutex_lock(&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);
-                        cfs_up(&filter->fo_create_locks[group]);
+                        cfs_mutex_unlock(&filter->fo_create_locks[group]);
                         RETURN(0);
                 }
                 diff = oa->o_id - last;
                 CDEBUG(D_HA, "filter_last_id() = "LPU64" -> diff = %d\n",
                        last, diff);
 
-                if (-diff > OST_MAX_PRECREATE) {
+                if (-diff > (OST_MAX_PRECREATE * 3) / 2) {
                         CERROR("%s: ignoring bogus orphan destroy request: "
                                "obdid "LPU64" last_id "LPU64"\n", obd->obd_name,
                                oa->o_id, last);
@@ -3602,7 +3705,7 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
                         cfs_clear_bit(group, &filter->fo_destroys_in_progress);
                 }
         } else {
-                cfs_down(&filter->fo_create_locks[group]);
+                cfs_mutex_lock(&filter->fo_create_locks[group]);
                 if (oti->oti_conn_cnt < exp->exp_conn_cnt) {
                         CERROR("%s: dropping old precreate request\n",
                                obd->obd_name);
@@ -3625,21 +3728,23 @@ static int filter_handle_precreate(struct obd_export *exp, struct obdo *oa,
                 rc = filter_precreate(obd, oa, group, &diff);
                 oa->o_id = filter_last_id(&obd->u.filter, group);
                 oa->o_seq = group;
-                oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
+                oa->o_valid |= (OBD_MD_FLID | OBD_MD_FLGROUP);
                 GOTO(out, rc);
         }
         /* else diff == 0 */
         GOTO(out, rc = 0);
 out:
-        cfs_up(&filter->fo_create_locks[group]);
+        cfs_mutex_unlock(&filter->fo_create_locks[group]);
         return rc;
 }
 
-static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
-                         __u64 max_age, __u32 flags)
+static int filter_statfs(const struct lu_env *env, struct obd_export *exp,
+                         struct obd_statfs *osfs, __u64 max_age, __u32 flags)
 {
+        struct obd_device *obd = class_exp2obd(exp);
         struct filter_obd *filter = &obd->u.filter;
         int blockbits = obd->u.obt.obt_sb->s_blocksize_bits;
+        struct lr_server_data *lsd = class_server_data(obd);
         int rc;
         ENTRY;
 
@@ -3663,16 +3768,13 @@ static int filter_statfs(struct obd_device *obd, struct obd_statfs *osfs,
                                ((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_CHECK_VALUE(OBD_FAIL_OST_ENOSPC,
+                                 le32_to_cpu(lsd->lsd_ost_index)))
+                osfs->os_bfree = osfs->os_bavail = 2;
 
-                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 */
-        }
+        if (OBD_FAIL_CHECK_VALUE(OBD_FAIL_OST_ENOINO,
+                                 le32_to_cpu(lsd->lsd_ost_index)))
+                osfs->os_ffree = 0;
 
         /* 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
@@ -3742,6 +3844,7 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
         struct dentry *dchild = NULL, *dparent = NULL;
         struct filter_obd *filter;
         struct obd_statfs *osfs;
+        struct iattr iattr;
         int err = 0, rc = 0, recreate_obj = 0, i;
         cfs_time_t enough_time = cfs_time_shift(DISK_TIMEOUT/2);
         __u64 os_ffree;
@@ -3751,7 +3854,7 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
 
         filter = &obd->u.filter;
 
-        LASSERT(down_trylock(&filter->fo_create_locks[group]) != 0);
+        LASSERT_MUTEX_LOCKED(&filter->fo_create_locks[group]);
 
         OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_PRECREATE, obd_timeout / 2);
 
@@ -3762,7 +3865,7 @@ 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,
+                rc = filter_statfs(NULL, obd->obd_self_export, osfs,
                                    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
                                    0);
                 if (rc == 0 && osfs->os_bavail < (osfs->os_blocks >> 10)) {
@@ -3770,6 +3873,13 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                                LPU64"\n", obd->obd_name, osfs->os_bavail <<
                                obd->u.obt.obt_vfsmnt->mnt_sb->s_blocksize_bits);
                         *num = 0;
+                        if (oa->o_valid & OBD_MD_FLFLAGS)
+                                oa->o_flags |= OBD_FL_NOSPC_BLK;
+                        else {
+                                oa->o_valid |= OBD_MD_FLFLAGS;
+                                oa->o_flags = OBD_FL_NOSPC_BLK;
+                        }
+
                         rc = -ENOSPC;
                 }
                 OBD_FREE(osfs, sizeof(*osfs));
@@ -3803,10 +3913,15 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                 } else
                         next_id = filter_last_id(filter, group) + 1;
 
-                /* 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",
+                /* Don't create objects beyond the valid range for this SEQ */
+                if (unlikely(fid_seq_is_mdt0(group) &&
+                            next_id >= IDIF_MAX_OID)) {
+                        CERROR("%s:"POSTID" hit the IDIF_MAX_OID (1<<48)!\n",
+                                obd->obd_name, next_id, group);
+                        GOTO(cleanup, rc = -ENOSPC);
+               } else if (unlikely(!fid_seq_is_mdt0(group) &&
+                                   next_id >= OBIF_MAX_OID)) {
+                        CERROR("%s:"POSTID" hit the OBIF_MAX_OID (1<<32)!\n",
                                 obd->obd_name, next_id, group);
                         GOTO(cleanup, rc = -ENOSPC);
                 }
@@ -3832,7 +3947,7 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                         } else {
                                 /* Use these existing objects if they are
                                  * zero length. */
-                                if (dchild->d_inode->i_size == 0) {
+                                if (i_size_read(dchild->d_inode) == 0) {
                                         rc = filter_use_existing_obj(obd,dchild,
                                                       &handle, &cleanup_phase);
                                         if (rc == 0)
@@ -3866,12 +3981,24 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                 rc = ll_vfs_create(dparent->d_inode, dchild,
                                    S_IFREG |  S_ISUID | S_ISGID | 0666, NULL);
                 if (rc) {
-                        CERROR("create failed rc = %d\n", rc);
+                        CWARN("%s: create failed: rc = %d\n", obd->obd_name,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);
+                                if (os_ffree == -1)
+                                        GOTO(cleanup, rc);
+
+                                if (obd->obd_osfs.os_bavail <
+                                    (obd->obd_osfs.os_blocks >> 10)) {
+                                        if (oa->o_valid & OBD_MD_FLFLAGS) {
+                                                oa->o_flags |= OBD_FL_NOSPC_BLK;
+                                        } else {
+                                                oa->o_valid |= OBD_MD_FLFLAGS;
+                                                oa->o_flags = OBD_FL_NOSPC_BLK;
+                                        }
+
+                                        CWARN("%s: free inode "LPU64"\n",
+                                              obd->obd_name, os_ffree);
+                                }
                         }
                         GOTO(cleanup, rc);
                 }
@@ -3881,12 +4008,27 @@ static int filter_precreate(struct obd_device *obd, struct obdo *oa,
                                        dchild->d_inode->i_ino);
 
 set_last_id:
+                /* Initialize a/c/m time so any client timestamp will always
+                 * be newer and update the inode. ctime = 0 is also handled
+                 * specially in fsfilt_ext3_setattr(). See LU-221, LU-1042 */
+                iattr.ia_valid = ATTR_ATIME | ATTR_MTIME | ATTR_CTIME;
+                LTIME_S(iattr.ia_atime) = 0;
+                LTIME_S(iattr.ia_mtime) = 0;
+                LTIME_S(iattr.ia_ctime) = 0;
+                err = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
+                 if (err)
+                        CWARN("%s: unable to initialize a/c/m time of newly "
+                              "created object %.*s: rc = %d\n",
+                              obd->obd_name, dchild->d_name.len,
+                              dchild->d_name.name, err);
+
                 if (!recreate_obj) {
                         filter_set_last_id(filter, next_id, group);
                         err = filter_update_last_objid(obd, group, 0);
                         if (err)
-                                CERROR("unable to write lastobjid "
-                                       "but file created\n");
+                                CERROR("%s: unable to write lastobjid "
+                                       "but file created: rc = %d\n",
+                                       obd->obd_name, err);
                 }
 
         cleanup:
@@ -3925,8 +4067,9 @@ set_last_id:
         RETURN(rc);
 }
 
-int filter_create(struct obd_export *exp, struct obdo *oa,
-                  struct lov_stripe_md **ea, struct obd_trans_info *oti)
+int filter_create(const struct lu_env *env, 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;
@@ -3942,7 +4085,17 @@ int filter_create(struct obd_export *exp, struct obdo *oa,
         fed = &exp->exp_filter_data;
         filter = &obd->u.filter;
 
-        if (fed->fed_group != oa->o_seq) {
+        /* 1.8 client doesn't carry the ocd_group with connect request,
+         * so the fed_group will always be zero for 1.8 client. */
+        if (!(exp->exp_connect_flags & OBD_CONNECT_FULL20)) {
+                if (oa->o_seq != FID_SEQ_OST_MDT0 &&
+                    oa->o_seq != FID_SEQ_LLOG &&
+                    oa->o_seq != FID_SEQ_ECHO) {
+                        CERROR("The request from older client has invalid"
+                               " group "LPU64"!\n", oa->o_seq);
+                        RETURN(-EINVAL);
+                }
+        } else 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 "
@@ -3972,9 +4125,9 @@ int filter_create(struct obd_export *exp, struct obdo *oa,
                         rc = -EINVAL;
                 } else {
                         diff = 1;
-                        cfs_down(&filter->fo_create_locks[oa->o_seq]);
+                        cfs_mutex_lock(&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]);
+                        cfs_mutex_unlock(&filter->fo_create_locks[oa->o_seq]);
                 }
         } else {
                 rc = filter_handle_precreate(exp, oa, oa->o_seq, oti);
@@ -3995,9 +4148,10 @@ int filter_create(struct obd_export *exp, struct obdo *oa,
         RETURN(rc);
 }
 
-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, void *capa)
+int filter_destroy(const struct lu_env *env, struct obd_export *exp,
+                   struct obdo *oa, struct lov_stripe_md *md,
+                   struct obd_trans_info *oti, struct obd_export *md_exp,
+                   void *capa)
 {
         unsigned int qcids[MAXQUOTAS] = {0, 0};
         struct obd_device *obd;
@@ -4009,6 +4163,7 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
         struct llog_cookie *fcc = NULL;
         int rc, rc2, cleanup_phase = 0, sync = 0;
         struct iattr iattr;
+        unsigned long now;
         ENTRY;
 
         rc = filter_auth_capa(exp, NULL, oa->o_seq,
@@ -4063,7 +4218,6 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
                 if (fcc != NULL)
                         *fcc = oa->o_lcookie;
         }
-        DQUOT_INIT(dchild->d_inode);
 
         /* we're gonna truncate it first in order to avoid possible deadlock:
          *      P1                      P2
@@ -4077,8 +4231,10 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
          * between page lock, i_mutex & starting new journal handle.
          * (see bug 20321) -johann
          */
+        now = jiffies;
         down_write(&dchild->d_inode->i_alloc_sem);
         LOCK_INODE_MUTEX(dchild->d_inode);
+        fsfilt_check_slow(exp->exp_obd, now, "i_alloc_sem and i_mutex");
 
         /* VBR: version recovery check */
         rc = filter_version_get_check(exp, oti, dchild->d_inode);
@@ -4096,6 +4252,9 @@ int filter_destroy(struct obd_export *exp, struct obdo *oa,
                 GOTO(cleanup, rc = PTR_ERR(handle));
         }
 
+        /* Locking order: i_mutex -> journal_lock -> dqptr_sem. LU-952 */
+        ll_vfs_dq_init(dchild->d_inode);
+
         iattr.ia_valid = ATTR_SIZE;
         iattr.ia_size = 0;
         rc = fsfilt_setattr(obd, dchild, handle, &iattr, 1);
@@ -4125,7 +4284,7 @@ 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, NULL, OBD_MD_FLUID|OBD_MD_FLGID);
+        obdo_from_inode(oa, dchild->d_inode, OBD_MD_FLUID | OBD_MD_FLGID);
 
         filter_fmd_drop(exp, oa->o_id, oa->o_seq);
 
@@ -4186,8 +4345,8 @@ cleanup:
 }
 
 /* NB start and end are used for punch, but not truncate */
-static int filter_truncate(struct obd_export *exp, struct obd_info *oinfo,
-                           struct obd_trans_info *oti,
+static int filter_truncate(const struct lu_env *env, struct obd_export *exp,
+                           struct obd_info *oinfo, struct obd_trans_info *oti,
                            struct ptlrpc_request_set *rqset)
 {
         int rc;
@@ -4204,15 +4363,13 @@ static int filter_truncate(struct obd_export *exp, struct obd_info *oinfo,
                 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;
+        rc = filter_setattr(env, exp, oinfo, oti);
         RETURN(rc);
 }
 
-static int filter_sync(struct obd_export *exp, struct obdo *oa,
-                       struct lov_stripe_md *lsm, obd_off start, obd_off end,
-                       void *capa)
+static int filter_sync(const struct lu_env *env, struct obd_export *exp,
+                       struct obd_info *oinfo, obd_off start, obd_off end,
+                       struct ptlrpc_request_set *set)
 {
         struct lvfs_run_ctxt saved;
         struct obd_device_target *obt;
@@ -4220,22 +4377,23 @@ static int filter_sync(struct obd_export *exp, struct obdo *oa,
         int rc, rc2;
         ENTRY;
 
-        rc = filter_auth_capa(exp, NULL, oa->o_seq,
-                              (struct lustre_capa *)capa, CAPA_OPC_OSS_WRITE);
+        rc = filter_auth_capa(exp, NULL, oinfo->oi_oa->o_seq,
+                              (struct lustre_capa *)oinfo->oi_capa,
+                              CAPA_OPC_OSS_WRITE);
         if (rc)
                 RETURN(rc);
 
         obt = &exp->exp_obd->u.obt;
 
         /* An objid of zero is taken to mean "sync whole filesystem" */
-        if (!oa || !(oa->o_valid & OBD_MD_FLID)) {
+        if (!oinfo->oi_oa || !(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
                 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->o_oi);
+        dentry = filter_oa2dentry(exp->exp_obd, &oinfo->oi_oa->o_oi);
         if (IS_ERR(dentry))
                 RETURN(PTR_ERR(dentry));
 
@@ -4257,17 +4415,18 @@ 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, NULL, FILTER_VALID_FLAGS);
+        oinfo->oi_oa->o_valid = OBD_MD_FLID;
+        obdo_from_inode(oinfo->oi_oa, dentry->d_inode, FILTER_VALID_FLAGS);
 
         pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
 
+       filter_counter_incr(exp, LPROC_FILTER_STATS_SYNC, oinfo->oi_jobid, 1);
         f_dput(dentry);
         RETURN(rc);
 }
 
-static int filter_get_info(struct obd_export *exp, __u32 keylen,
-                           void *key, __u32 *vallen, void *val,
+static int filter_get_info(const struct lu_env *env, struct obd_export *exp,
+                           __u32 keylen, void *key, __u32 *vallen, void *val,
                            struct lov_stripe_md *lsm)
 {
         struct obd_device *obd;
@@ -4423,7 +4582,8 @@ out:
         RETURN(rc);
 }
 
-static int filter_set_info_async(struct obd_export *exp, __u32 keylen,
+static int filter_set_info_async(const struct lu_env *env,
+                                 struct obd_export *exp, __u32 keylen,
                                  void *key, __u32 vallen, void *val,
                                  struct ptlrpc_request_set *set)
 {
@@ -4499,8 +4659,8 @@ int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
                 CDEBUG(D_HA, "syncing ost %s\n", obd->obd_name);
                 rc = fsfilt_sync(obd, obd->u.obt.obt_sb);
 
-                lvfs_set_rdonly(obd, obd->u.obt.obt_sb);
-                RETURN(0);
+                rc = lvfs_set_rdonly(obd, obd->u.obt.obt_sb);
+                RETURN(rc);
         }
 
         case OBD_IOC_CATLOGLIST: {
@@ -4532,7 +4692,7 @@ int filter_iocontrol(unsigned int cmd, struct obd_export *exp,
         RETURN(0);
 }
 
-static int filter_health_check(struct obd_device *obd)
+static int filter_health_check(const struct lu_env *env, struct obd_device *obd)
 {
 #ifdef USE_HEALTH_CHECK_WRITE
         struct filter_obd *filter = &obd->u.filter;
@@ -4580,6 +4740,24 @@ static int filter_process_config(struct obd_device *obd, obd_count len,
         return rc;
 }
 
+static int filter_notify(struct obd_device *obd,
+                         struct obd_device *unused,
+                         enum obd_notify_event ev, void *data)
+{
+        switch (ev) {
+        case OBD_NOTIFY_CONFIG:
+                LASSERT(obd->obd_no_conn);
+                cfs_spin_lock(&obd->obd_dev_lock);
+                obd->obd_no_conn = 0;
+                cfs_spin_unlock(&obd->obd_dev_lock);
+                break;
+        default:
+                CDEBUG(D_INFO, "%s: Unhandled notification %#x\n",
+                       obd->obd_name, ev);
+        }
+        return 0;
+}
+
 static struct lvfs_callback_ops filter_lvfs_ops = {
         l_fid2dentry:     filter_lvfs_fid2dentry,
 };
@@ -4603,7 +4781,6 @@ static struct obd_ops filter_obd_ops = {
         .o_create         = filter_create,
         .o_setattr        = filter_setattr,
         .o_destroy        = filter_destroy,
-        .o_brw            = filter_brw,
         .o_punch          = filter_truncate,
         .o_sync           = filter_sync,
         .o_preprw         = filter_preprw,
@@ -4614,6 +4791,7 @@ static struct obd_ops filter_obd_ops = {
         .o_iocontrol      = filter_iocontrol,
         .o_health_check   = filter_health_check,
         .o_process_config = filter_process_config,
+        .o_notify         = filter_notify,
 };
 
 quota_interface_t *filter_quota_interface_ref;