X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fofd%2Fofd_dev.c;h=6351855946e48429bf47376a74c4fa3effa65224;hp=6d7fd09bf722170cff5f0d3b14a0eed51c91c094;hb=0d92e17afa7ff7024d3e18268a2e1a89cba4d5bd;hpb=4f5830f769f9cc9bacfcdfee9de5962324fb5c81

diff --git a/lustre/ofd/ofd_dev.c b/lustre/ofd/ofd_dev.c
index 6d7fd09..6351855 100644
--- a/lustre/ofd/ofd_dev.c
+++ b/lustre/ofd/ofd_dev.c
@@ -46,6 +46,9 @@
 #include <lustre_param.h>
 #include <lustre_fid.h>
 #include <lustre_lfsck.h>
+#include <lustre/lustre_idl.h>
+#include <lustre_dlm.h>
+#include <lustre_quota.h>
 
 #include "ofd_internal.h"
 
@@ -78,7 +81,7 @@ static int ofd_connect_to_next(const struct lu_env *env, struct ofd_device *m,
 	obd = class_name2obd(next);
 	if (obd == NULL) {
 		CERROR("%s: can't locate next device: %s\n",
-		       m->ofd_dt_dev.dd_lu_dev.ld_obd->obd_name, next);
+		       ofd_name(m), next);
 		GOTO(out, rc = -ENOTCONN);
 	}
 
@@ -88,7 +91,7 @@ static int ofd_connect_to_next(const struct lu_env *env, struct ofd_device *m,
 	rc = obd_connect(NULL, exp, obd, &obd->obd_uuid, data, NULL);
 	if (rc) {
 		CERROR("%s: cannot connect to next dev %s: rc = %d\n",
-		       m->ofd_dt_dev.dd_lu_dev.ld_obd->obd_name, next, rc);
+		       ofd_name(m), next, rc);
 		GOTO(out, rc);
 	}
 
@@ -154,7 +157,6 @@ static void ofd_stack_fini(const struct lu_env *env, struct ofd_device *m,
 	ENTRY;
 
 	lu_site_purge(env, top->ld_site, ~0);
-
 	/* process cleanup, pass mdt obd name to get obd umount flags */
 	lustre_cfg_bufs_reset(&bufs, obd->obd_name);
 	if (obd->obd_force)
@@ -173,10 +175,13 @@ static void ofd_stack_fini(const struct lu_env *env, struct ofd_device *m,
 	lustre_cfg_free(lcfg);
 
 	lu_site_purge(env, top->ld_site, ~0);
+	if (!cfs_hash_is_empty(top->ld_site->ls_obj_hash)) {
+		LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
+		lu_site_print(env, top->ld_site, &msgdata, lu_cdebug_printer);
+	}
 
 	LASSERT(m->ofd_osd_exp);
 	obd_disconnect(m->ofd_osd_exp);
-	m->ofd_osd = NULL;
 
 	EXIT;
 }
@@ -187,6 +192,40 @@ static struct cfg_interop_param ofd_interop_param[] = {
 	{ NULL }
 };
 
+/* Some parameters were moved from ofd to osd and only their
+ * symlinks were kept in ofd by LU-3106. They are:
+ * -writehthrough_cache_enable
+ * -readcache_max_filese
+ * -read_cache_enable
+ * -brw_stats
+ * Since they are not included by the static lprocfs var list,
+ * a pre-check is added for them to avoid "unknown param" error
+ * message confuses the customer. If they are matched in this
+ * check, they will be passed to the osd directly.
+ */
+static bool match_symlink_param(char *param)
+{
+	char *sval;
+	int paramlen;
+
+	if (class_match_param(param, PARAM_OST, &param) == 0) {
+		sval = strchr(param, '=');
+		if (sval != NULL) {
+			paramlen = sval - param;
+			if (strncmp(param, "writethrough_cache_enable",
+				    paramlen) == 0 ||
+			    strncmp(param, "readcache_max_filesize",
+				    paramlen) == 0 ||
+			    strncmp(param, "read_cache_enable",
+				    paramlen) == 0 ||
+			    strncmp(param, "brw_stats", paramlen) == 0)
+				return true;
+		}
+	}
+
+	return false;
+}
+
 /* used by MGS to process specific configurations */
 static int ofd_process_config(const struct lu_env *env, struct lu_device *d,
 			      struct lustre_cfg *cfg)
@@ -200,8 +239,7 @@ static int ofd_process_config(const struct lu_env *env, struct lu_device *d,
 
 	switch (cfg->lcfg_command) {
 	case LCFG_PARAM: {
-		struct lprocfs_static_vars lvars;
-
+		struct obd_device	*obd = ofd_obd(m);
 		/* For interoperability */
 		struct cfg_interop_param   *ptr = NULL;
 		struct lustre_cfg	   *old_cfg = NULL;
@@ -234,12 +272,19 @@ static int ofd_process_config(const struct lu_env *env, struct lu_device *d,
 			}
 		}
 
-		lprocfs_ofd_init_vars(&lvars);
-		rc = class_process_proc_param(PARAM_OST, lvars.obd_vars, cfg,
+		if (match_symlink_param(param)) {
+			rc = next->ld_ops->ldo_process_config(env, next, cfg);
+			break;
+		}
+
+		rc = class_process_proc_seq_param(PARAM_OST, obd->obd_vars, cfg,
 					      d->ld_obd);
-		if (rc > 0 || rc == -ENOSYS)
+		if (rc > 0 || rc == -ENOSYS) {
+			CDEBUG(D_CONFIG, "pass param %s down the stack.\n",
+			       param);
 			/* we don't understand; pass it on */
 			rc = next->ld_ops->ldo_process_config(env, next, cfg);
+		}
 		break;
 	}
 	case LCFG_SPTLRPC_CONF: {
@@ -314,7 +359,7 @@ static struct lu_object *ofd_object_alloc(const struct lu_env *env,
 
 	ENTRY;
 
-	OBD_SLAB_ALLOC_PTR_GFP(of, ofd_object_kmem, __GFP_IO);
+	OBD_SLAB_ALLOC_PTR_GFP(of, ofd_object_kmem, GFP_NOFS);
 	if (of != NULL) {
 		struct lu_object	*o;
 		struct lu_object_header *h;
@@ -333,6 +378,38 @@ static struct lu_object *ofd_object_alloc(const struct lu_env *env,
 
 extern int ost_handle(struct ptlrpc_request *req);
 
+static int ofd_lfsck_out_notify(const struct lu_env *env, void *data,
+				enum lfsck_events event)
+{
+	struct ofd_device *ofd = data;
+	struct obd_device *obd = ofd_obd(ofd);
+
+	switch (event) {
+	case LE_LASTID_REBUILDING:
+		CWARN("%s: Found crashed LAST_ID, deny creating new OST-object "
+		      "on the device until the LAST_ID rebuilt successfully.\n",
+		      obd->obd_name);
+		down_write(&ofd->ofd_lastid_rwsem);
+		ofd->ofd_lastid_rebuilding = 1;
+		up_write(&ofd->ofd_lastid_rwsem);
+		break;
+	case LE_LASTID_REBUILT: {
+		down_write(&ofd->ofd_lastid_rwsem);
+		ofd_seqs_free(env, ofd);
+		ofd->ofd_lastid_rebuilding = 0;
+		ofd->ofd_lastid_gen++;
+		up_write(&ofd->ofd_lastid_rwsem);
+		break;
+	}
+	default:
+		CERROR("%s: unknown lfsck event: rc = %d\n",
+		       ofd_name(ofd), event);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int ofd_prepare(const struct lu_env *env, struct lu_device *pdev,
 		       struct lu_device *dev)
 {
@@ -340,17 +417,10 @@ static int ofd_prepare(const struct lu_env *env, struct lu_device *pdev,
 	struct ofd_device		*ofd = ofd_dev(dev);
 	struct obd_device		*obd = ofd_obd(ofd);
 	struct lu_device		*next = &ofd->ofd_osd->dd_lu_dev;
-	struct lfsck_start_param	 lsp;
 	int				 rc;
 
 	ENTRY;
 
-	rc = lu_env_refill((struct lu_env *)env);
-	if (rc != 0) {
-		CERROR("Failure to refill session: '%d'\n", rc);
-		RETURN(rc);
-	}
-
 	info = ofd_info_init(env, NULL);
 	if (info == NULL)
 		RETURN(-EFAULT);
@@ -360,23 +430,20 @@ static int ofd_prepare(const struct lu_env *env, struct lu_device *pdev,
 	if (rc != 0)
 		RETURN(rc);
 
-	rc = lfsck_register(env, ofd->ofd_osd, &ofd->ofd_dt_dev, false);
+	rc = lfsck_register(env, ofd->ofd_osd, ofd->ofd_osd, obd,
+			    ofd_lfsck_out_notify, ofd, false);
 	if (rc != 0) {
 		CERROR("%s: failed to initialize lfsck: rc = %d\n",
 		       obd->obd_name, rc);
 		RETURN(rc);
 	}
 
-	lsp.lsp_start = NULL;
-	lsp.lsp_namespace = ofd->ofd_namespace;
-	rc = lfsck_start(env, ofd->ofd_osd, &lsp);
-	if (rc != 0) {
-		CWARN("%s: auto trigger paused LFSCK failed: rc = %d\n",
-		      obd->obd_name, rc);
-		rc = 0;
-	}
+	rc = lfsck_register_namespace(env, ofd->ofd_osd, ofd->ofd_namespace);
+	/* The LFSCK instance is registered just now, so it must be there when
+	 * register the namespace to such instance. */
+	LASSERTF(rc == 0, "register namespace failed: rc = %d\n", rc);
 
-	target_recovery_init(&ofd->ofd_lut, ost_handle);
+	target_recovery_init(&ofd->ofd_lut, tgt_request_handle);
 	LASSERT(obd->obd_no_conn);
 	spin_lock(&obd->obd_dev_lock);
 	obd->obd_no_conn = 0;
@@ -416,9 +483,10 @@ static struct lu_device_operations ofd_lu_ops = {
 	.ldo_prepare		= ofd_prepare,
 };
 
+LPROC_SEQ_FOPS(lprocfs_nid_stats_clear);
+
 static int ofd_procfs_init(struct ofd_device *ofd)
 {
-	struct lprocfs_static_vars	 lvars;
 	struct obd_device		*obd = ofd_obd(ofd);
 	cfs_proc_dir_entry_t		*entry;
 	int				 rc = 0;
@@ -427,28 +495,25 @@ static int ofd_procfs_init(struct ofd_device *ofd)
 
 	/* lprocfs must be setup before the ofd so state can be safely added
 	 * to /proc incrementally as the ofd is setup */
-	lprocfs_ofd_init_vars(&lvars);
-	rc = lprocfs_obd_setup(obd, lvars.obd_vars);
+	obd->obd_vars = lprocfs_ofd_obd_vars;
+	rc = lprocfs_seq_obd_setup(obd);
 	if (rc) {
 		CERROR("%s: lprocfs_obd_setup failed: %d.\n",
 		       obd->obd_name, rc);
 		RETURN(rc);
 	}
 
-	rc = lprocfs_alloc_obd_stats(obd, LPROC_OFD_LAST);
+	rc = lprocfs_alloc_obd_stats(obd, LPROC_OFD_STATS_LAST);
 	if (rc) {
 		CERROR("%s: lprocfs_alloc_obd_stats failed: %d.\n",
 		       obd->obd_name, rc);
 		GOTO(obd_cleanup, rc);
 	}
 
-	/* Init OFD private stats here */
-	lprocfs_counter_init(obd->obd_stats, LPROC_OFD_READ_BYTES,
-			     LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
-	lprocfs_counter_init(obd->obd_stats, LPROC_OFD_WRITE_BYTES,
-			     LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
+	obd->obd_uses_nid_stats = 1;
 
-	entry = lprocfs_register("exports", obd->obd_proc_entry, NULL, NULL);
+	entry = lprocfs_seq_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",
@@ -458,8 +523,10 @@ static int ofd_procfs_init(struct ofd_device *ofd)
 	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);
+#ifndef HAVE_ONLY_PROCFS_SEQ
+				   NULL, NULL,
+#endif
+				   obd, &lprocfs_nid_stats_clear_fops);
 	if (IS_ERR(entry)) {
 		rc = PTR_ERR(entry);
 		CERROR("%s: add proc entry 'clear' failed: %d.\n",
@@ -467,13 +534,13 @@ static int ofd_procfs_init(struct ofd_device *ofd)
 		GOTO(obd_cleanup, rc);
 	}
 
+	ofd_stats_counter_init(obd->obd_stats);
+
 	rc = lprocfs_job_stats_init(obd, LPROC_OFD_STATS_LAST,
 				    ofd_stats_counter_init);
 	if (rc)
-		GOTO(remove_entry_clear, rc);
+		GOTO(obd_cleanup, rc);
 	RETURN(0);
-remove_entry_clear:
-	lprocfs_remove_proc_entry("clear", obd->obd_proc_exports_entry);
 obd_cleanup:
 	lprocfs_obd_cleanup(obd);
 	lprocfs_free_obd_stats(obd);
@@ -481,51 +548,46 @@ obd_cleanup:
 	return rc;
 }
 
+/**
+ * ofd_procfs_add_brw_stats_symlink - expose osd stats to ofd layer
+ *
+ * The osd interfaces to the backend file system exposes useful data
+ * such as brw_stats and read or write cache states. This same data
+ * needs to be exposed into the obdfilter (ofd) layer to maintain
+ * backwards compatibility. This function creates the symlinks in the
+ * proc layer to enable this.
+ */
 static void ofd_procfs_add_brw_stats_symlink(struct ofd_device *ofd)
 {
 	struct obd_device	*obd = ofd_obd(ofd);
 	struct obd_device	*osd_obd = ofd->ofd_osd_exp->exp_obd;
-	cfs_proc_dir_entry_t	*osd_root = osd_obd->obd_type->typ_procroot;
-	cfs_proc_dir_entry_t	*osd_dir;
 
-	osd_dir = lprocfs_srch(osd_root, obd->obd_name);
-	if (osd_dir == NULL)
+	if (obd->obd_proc_entry == NULL)
 		return;
 
-	if (lprocfs_srch(osd_dir, "brw_stats") != NULL)
-		lprocfs_add_symlink("brw_stats", obd->obd_proc_entry,
-				    "../../%s/%s/brw_stats",
-				    osd_root->name, osd_dir->name);
+	lprocfs_add_symlink("brw_stats", obd->obd_proc_entry,
+			    "../../%s/%s/brw_stats",
+			    osd_obd->obd_type->typ_name, obd->obd_name);
 
-	if (lprocfs_srch(osd_dir, "read_cache_enable") != NULL)
-		lprocfs_add_symlink("read_cache_enable", obd->obd_proc_entry,
-				    "../../%s/%s/read_cache_enable",
-				    osd_root->name, osd_dir->name);
+	lprocfs_add_symlink("read_cache_enable", obd->obd_proc_entry,
+			    "../../%s/%s/read_cache_enable",
+			    osd_obd->obd_type->typ_name, obd->obd_name);
 
-	if (lprocfs_srch(osd_dir, "readcache_max_filesize") != NULL)
-		lprocfs_add_symlink("readcache_max_filesize",
-				    obd->obd_proc_entry,
-				    "../../%s/%s/readcache_max_filesize",
-				    osd_root->name, osd_dir->name);
+	lprocfs_add_symlink("readcache_max_filesize",
+			    obd->obd_proc_entry,
+			    "../../%s/%s/readcache_max_filesize",
+			    osd_obd->obd_type->typ_name, obd->obd_name);
 
-	if (lprocfs_srch(osd_dir, "writethrough_cache_enable") != NULL)
-		lprocfs_add_symlink("writethrough_cache_enable",
-				    obd->obd_proc_entry,
-				    "../../%s/%s/writethrough_cache_enable",
-				    osd_root->name, osd_dir->name);
+	lprocfs_add_symlink("writethrough_cache_enable",
+			    obd->obd_proc_entry,
+			    "../../%s/%s/writethrough_cache_enable",
+			    osd_obd->obd_type->typ_name, obd->obd_name);
 }
 
 static void ofd_procfs_fini(struct ofd_device *ofd)
 {
 	struct obd_device *obd = ofd_obd(ofd);
 
-	lprocfs_remove_proc_entry("writethrough_cache_enable",
-				  obd->obd_proc_entry);
-	lprocfs_remove_proc_entry("readcache_max_filesize",
-				  obd->obd_proc_entry);
-	lprocfs_remove_proc_entry("read_cache_enable", obd->obd_proc_entry);
-	lprocfs_remove_proc_entry("brw_stats", obd->obd_proc_entry);
-	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);
@@ -563,8 +625,8 @@ int ofd_fid_init(const struct lu_env *env, struct ofd_device *ofd)
 		GOTO(out_free, rc = -ENOMEM);
 	}
 
-	rc = seq_server_init(ss->ss_server_seq, ofd->ofd_osd, obd_name,
-			     LUSTRE_SEQ_SERVER, ss, env);
+	rc = seq_server_init(env, ss->ss_server_seq, ofd->ofd_osd, obd_name,
+			     LUSTRE_SEQ_SERVER, ss);
 	if (rc) {
 		CERROR("%s : seq server init error %d\n", obd_name, rc);
 		GOTO(out_free, rc);
@@ -585,7 +647,7 @@ int ofd_fid_init(const struct lu_env *env, struct ofd_device *ofd)
 	OBD_FREE(name, strlen(obd_name) + 10);
 	name = NULL;
 
-	rc = seq_server_set_cli(ss->ss_server_seq, ss->ss_client_seq, env);
+	rc = seq_server_set_cli(env, ss->ss_server_seq, ss->ss_client_seq);
 
 out_free:
 	if (rc) {
@@ -610,11 +672,1412 @@ out_free:
 	return rc;
 }
 
+int ofd_set_info_hdl(struct tgt_session_info *tsi)
+{
+	struct ptlrpc_request	*req = tgt_ses_req(tsi);
+	struct ost_body		*body = NULL, *repbody;
+	void			*key, *val = NULL;
+	int			 keylen, vallen, rc = 0;
+	bool			 is_grant_shrink;
+	struct ofd_device	*ofd = ofd_exp(tsi->tsi_exp);
+
+	ENTRY;
+
+	key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
+	if (key == NULL) {
+		DEBUG_REQ(D_HA, req, "no set_info key");
+		RETURN(err_serious(-EFAULT));
+	}
+	keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
+				      RCL_CLIENT);
+
+	val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
+	if (val == NULL) {
+		DEBUG_REQ(D_HA, req, "no set_info val");
+		RETURN(err_serious(-EFAULT));
+	}
+	vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
+				      RCL_CLIENT);
+
+	is_grant_shrink = KEY_IS(KEY_GRANT_SHRINK);
+	if (is_grant_shrink)
+		/* In this case the value is actually an RMF_OST_BODY, so we
+		 * transmutate the type of this PTLRPC */
+		req_capsule_extend(tsi->tsi_pill, &RQF_OST_SET_GRANT_INFO);
+
+	rc = req_capsule_server_pack(tsi->tsi_pill);
+	if (rc < 0)
+		RETURN(rc);
+
+	if (is_grant_shrink) {
+		body = req_capsule_client_get(tsi->tsi_pill, &RMF_OST_BODY);
+
+		repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+		*repbody = *body;
+
+		/** handle grant shrink, similar to a read request */
+		ofd_grant_prepare_read(tsi->tsi_env, tsi->tsi_exp,
+				       &repbody->oa);
+	} else if (KEY_IS(KEY_EVICT_BY_NID)) {
+		if (vallen > 0)
+			obd_export_evict_by_nid(tsi->tsi_exp->exp_obd, val);
+		rc = 0;
+	} else if (KEY_IS(KEY_CAPA_KEY)) {
+		rc = ofd_update_capa_key(ofd, val);
+	} else if (KEY_IS(KEY_SPTLRPC_CONF)) {
+		rc = tgt_adapt_sptlrpc_conf(tsi->tsi_tgt, 0);
+	} else {
+		CERROR("%s: Unsupported key %s\n",
+		       tgt_name(tsi->tsi_tgt), (char *)key);
+		rc = -EOPNOTSUPP;
+	}
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_SET_INFO,
+			 tsi->tsi_jobid, 1);
+
+	RETURN(rc);
+}
+
+int ofd_fiemap_get(const struct lu_env *env, struct ofd_device *ofd,
+		   struct lu_fid *fid, struct ll_user_fiemap *fiemap)
+{
+	struct ofd_object	*fo;
+	int			 rc;
+
+	fo = ofd_object_find(env, ofd, fid);
+	if (IS_ERR(fo)) {
+		CERROR("%s: error finding object "DFID"\n",
+		       ofd_name(ofd), PFID(fid));
+		return PTR_ERR(fo);
+	}
+
+	ofd_read_lock(env, fo);
+	if (ofd_object_exists(fo))
+		rc = dt_fiemap_get(env, ofd_object_child(fo), fiemap);
+	else
+		rc = -ENOENT;
+	ofd_read_unlock(env, fo);
+	ofd_object_put(env, fo);
+	return rc;
+}
+
+struct locked_region {
+	cfs_list_t		list;
+	struct lustre_handle	lh;
+};
+
+static int lock_region(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
+		       unsigned long long begin, unsigned long long end,
+		       cfs_list_t *locked)
+{
+	struct locked_region	*region = NULL;
+	__u64			 flags = 0;
+	int			 rc;
+
+	LASSERT(begin <= end);
+	OBD_ALLOC_PTR(region);
+	if (region == NULL)
+		return -ENOMEM;
+
+	rc = tgt_extent_lock(ns, res_id, begin, end, &region->lh,
+			     LCK_PR, &flags);
+	if (rc != 0)
+		return rc;
+
+	CDEBUG(D_OTHER, "ost lock [%llu,%llu], lh=%p\n", begin, end,
+	       &region->lh);
+	cfs_list_add(&region->list, locked);
+
+	return 0;
+}
+
+static int lock_zero_regions(struct ldlm_namespace *ns,
+			     struct ldlm_res_id *res_id,
+			     struct ll_user_fiemap *fiemap,
+			     cfs_list_t *locked)
+{
+	__u64 begin = fiemap->fm_start;
+	unsigned int i;
+	int rc = 0;
+	struct ll_fiemap_extent *fiemap_start = fiemap->fm_extents;
+
+	ENTRY;
+
+	CDEBUG(D_OTHER, "extents count %u\n", fiemap->fm_mapped_extents);
+	for (i = 0; i < fiemap->fm_mapped_extents; i++) {
+		if (fiemap_start[i].fe_logical > begin) {
+			CDEBUG(D_OTHER, "ost lock [%llu,%llu]\n",
+			       begin, fiemap_start[i].fe_logical);
+			rc = lock_region(ns, res_id, begin,
+					 fiemap_start[i].fe_logical, locked);
+			if (rc)
+				RETURN(rc);
+		}
+
+		begin = fiemap_start[i].fe_logical + fiemap_start[i].fe_length;
+	}
+
+	if (begin < (fiemap->fm_start + fiemap->fm_length)) {
+		CDEBUG(D_OTHER, "ost lock [%llu,%llu]\n",
+		       begin, fiemap->fm_start + fiemap->fm_length);
+		rc = lock_region(ns, res_id, begin,
+				 fiemap->fm_start + fiemap->fm_length, locked);
+	}
+
+	RETURN(rc);
+}
+
+static void unlock_zero_regions(struct ldlm_namespace *ns, cfs_list_t *locked)
+{
+	struct locked_region *entry, *temp;
+
+	cfs_list_for_each_entry_safe(entry, temp, locked, list) {
+		CDEBUG(D_OTHER, "ost unlock lh=%p\n", &entry->lh);
+		tgt_extent_unlock(&entry->lh, LCK_PR);
+		cfs_list_del(&entry->list);
+		OBD_FREE_PTR(entry);
+	}
+}
+
+int ofd_get_info_hdl(struct tgt_session_info *tsi)
+{
+	struct obd_export		*exp = tsi->tsi_exp;
+	struct ofd_device		*ofd = ofd_exp(exp);
+	struct ofd_thread_info		*fti = tsi2ofd_info(tsi);
+	void				*key;
+	int				 keylen;
+	int				 replylen, rc = 0;
+
+	ENTRY;
+
+	/* this common part for get_info rpc */
+	key = req_capsule_client_get(tsi->tsi_pill, &RMF_GETINFO_KEY);
+	if (key == NULL) {
+		DEBUG_REQ(D_HA, tgt_ses_req(tsi), "no get_info key");
+		RETURN(err_serious(-EPROTO));
+	}
+	keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_GETINFO_KEY,
+				      RCL_CLIENT);
+
+	if (KEY_IS(KEY_LAST_ID)) {
+		obd_id		*last_id;
+		struct ofd_seq	*oseq;
+
+		req_capsule_extend(tsi->tsi_pill, &RQF_OST_GET_INFO_LAST_ID);
+		rc = req_capsule_server_pack(tsi->tsi_pill);
+		if (rc)
+			RETURN(err_serious(rc));
+
+		last_id = req_capsule_server_get(tsi->tsi_pill, &RMF_OBD_ID);
+
+		oseq = ofd_seq_load(tsi->tsi_env, ofd,
+				    (obd_seq)exp->exp_filter_data.fed_group);
+		if (IS_ERR(oseq))
+			rc = -EFAULT;
+		else
+			*last_id = ofd_seq_last_oid(oseq);
+		ofd_seq_put(tsi->tsi_env, oseq);
+	} else if (KEY_IS(KEY_FIEMAP)) {
+		struct ll_fiemap_info_key	*fm_key;
+		struct ll_user_fiemap		*fiemap;
+		struct lu_fid			*fid;
+
+		req_capsule_extend(tsi->tsi_pill, &RQF_OST_GET_INFO_FIEMAP);
+
+		fm_key = req_capsule_client_get(tsi->tsi_pill, &RMF_FIEMAP_KEY);
+		rc = tgt_validate_obdo(tsi, &fm_key->oa);
+		if (rc)
+			RETURN(err_serious(rc));
+
+		fid = &fm_key->oa.o_oi.oi_fid;
+
+		CDEBUG(D_INODE, "get FIEMAP of object "DFID"\n", PFID(fid));
+
+		replylen = fiemap_count_to_size(fm_key->fiemap.fm_extent_count);
+		req_capsule_set_size(tsi->tsi_pill, &RMF_FIEMAP_VAL,
+				     RCL_SERVER, replylen);
+
+		rc = req_capsule_server_pack(tsi->tsi_pill);
+		if (rc)
+			RETURN(err_serious(rc));
+
+		fiemap = req_capsule_server_get(tsi->tsi_pill, &RMF_FIEMAP_VAL);
+		if (fiemap == NULL)
+			RETURN(-ENOMEM);
+
+		*fiemap = fm_key->fiemap;
+		rc = ofd_fiemap_get(tsi->tsi_env, ofd, fid, fiemap);
+
+		/* LU-3219: Lock the sparse areas to make sure dirty
+		 * flushed back from client, then call fiemap again. */
+		if (fm_key->oa.o_valid & OBD_MD_FLFLAGS &&
+		    fm_key->oa.o_flags & OBD_FL_SRVLOCK) {
+			cfs_list_t locked = CFS_LIST_HEAD_INIT(locked);
+
+			ost_fid_build_resid(fid, &fti->fti_resid);
+			rc = lock_zero_regions(ofd->ofd_namespace,
+					       &fti->fti_resid, fiemap,
+					       &locked);
+			if (rc == 0 && !cfs_list_empty(&locked)) {
+				rc = ofd_fiemap_get(tsi->tsi_env, ofd, fid,
+						    fiemap);
+				unlock_zero_regions(ofd->ofd_namespace,
+						    &locked);
+			}
+		}
+	} else if (KEY_IS(KEY_LAST_FID)) {
+		struct ofd_device	*ofd = ofd_exp(exp);
+		struct ofd_seq		*oseq;
+		struct lu_fid		*fid;
+		int			 rc;
+
+		req_capsule_extend(tsi->tsi_pill, &RQF_OST_GET_INFO_LAST_FID);
+		rc = req_capsule_server_pack(tsi->tsi_pill);
+		if (rc)
+			RETURN(err_serious(rc));
+
+		fid = req_capsule_client_get(tsi->tsi_pill, &RMF_FID);
+		if (fid == NULL)
+			RETURN(err_serious(-EPROTO));
+
+		fid_le_to_cpu(&fti->fti_ostid.oi_fid, fid);
+
+		fid = req_capsule_server_get(tsi->tsi_pill, &RMF_FID);
+		if (fid == NULL)
+			RETURN(-ENOMEM);
+
+		oseq = ofd_seq_load(tsi->tsi_env, ofd,
+				    ostid_seq(&fti->fti_ostid));
+		if (IS_ERR(oseq))
+			RETURN(PTR_ERR(oseq));
+
+		rc = ostid_to_fid(fid, &oseq->os_oi,
+				  ofd->ofd_lut.lut_lsd.lsd_osd_index);
+		if (rc != 0)
+			GOTO(out_put, rc);
+
+		CDEBUG(D_HA, "%s: LAST FID is "DFID"\n", ofd_name(ofd),
+		       PFID(fid));
+out_put:
+		ofd_seq_put(tsi->tsi_env, oseq);
+	} else {
+		CERROR("%s: not supported key %s\n", tgt_name(tsi->tsi_tgt),
+		       (char *)key);
+		rc = -EOPNOTSUPP;
+	}
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_GET_INFO,
+			 tsi->tsi_jobid, 1);
+
+	RETURN(rc);
+}
+
+static int ofd_getattr_hdl(struct tgt_session_info *tsi)
+{
+	struct ofd_thread_info	*fti = tsi2ofd_info(tsi);
+	struct ofd_device	*ofd = ofd_exp(tsi->tsi_exp);
+	struct ost_body		*repbody;
+	struct lustre_handle	 lh = { 0 };
+	struct ofd_object	*fo;
+	__u64			 flags = 0;
+	ldlm_mode_t		 lock_mode = LCK_PR;
+	bool			 srvlock;
+	int			 rc;
+	ENTRY;
+
+	LASSERT(tsi->tsi_ost_body != NULL);
+
+	repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+	if (repbody == NULL)
+		RETURN(-ENOMEM);
+
+	repbody->oa.o_oi = tsi->tsi_ost_body->oa.o_oi;
+	repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
+
+	srvlock = tsi->tsi_ost_body->oa.o_valid & OBD_MD_FLFLAGS &&
+		  tsi->tsi_ost_body->oa.o_flags & OBD_FL_SRVLOCK;
+
+	if (srvlock) {
+		if (unlikely(tsi->tsi_ost_body->oa.o_flags & OBD_FL_FLUSH))
+			lock_mode = LCK_PW;
+
+		rc = tgt_extent_lock(tsi->tsi_tgt->lut_obd->obd_namespace,
+				     &tsi->tsi_resid, 0, OBD_OBJECT_EOF, &lh,
+				     lock_mode, &flags);
+		if (rc != 0)
+			RETURN(rc);
+	}
+
+	fo = ofd_object_find_exists(tsi->tsi_env, ofd, &tsi->tsi_fid);
+	if (IS_ERR(fo))
+		GOTO(out, rc = PTR_ERR(fo));
+
+	rc = ofd_attr_get(tsi->tsi_env, fo, &fti->fti_attr);
+	if (rc == 0) {
+		__u64	 curr_version;
+
+		obdo_from_la(&repbody->oa, &fti->fti_attr,
+			     OFD_VALID_FLAGS | LA_UID | LA_GID);
+		tgt_drop_id(tsi->tsi_exp, &repbody->oa);
+
+		/* Store object version in reply */
+		curr_version = dt_version_get(tsi->tsi_env,
+					      ofd_object_child(fo));
+		if ((__s64)curr_version != -EOPNOTSUPP) {
+			repbody->oa.o_valid |= OBD_MD_FLDATAVERSION;
+			repbody->oa.o_data_version = curr_version;
+		}
+	}
+
+	ofd_object_put(tsi->tsi_env, fo);
+out:
+	if (srvlock)
+		tgt_extent_unlock(&lh, lock_mode);
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_GETATTR,
+			 tsi->tsi_jobid, 1);
+
+	repbody->oa.o_valid |= OBD_MD_FLFLAGS;
+	repbody->oa.o_flags = OBD_FL_FLUSH;
+
+	RETURN(rc);
+}
+
+static int ofd_setattr_hdl(struct tgt_session_info *tsi)
+{
+	struct ofd_thread_info	*fti = tsi2ofd_info(tsi);
+	struct ofd_device	*ofd = ofd_exp(tsi->tsi_exp);
+	struct ost_body		*body = tsi->tsi_ost_body;
+	struct ost_body		*repbody;
+	struct ldlm_resource	*res;
+	struct ofd_object	*fo;
+	struct filter_fid	*ff = NULL;
+	int			 rc = 0;
+
+	ENTRY;
+
+	LASSERT(body != NULL);
+
+	repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+	if (repbody == NULL)
+		RETURN(-ENOMEM);
+
+	repbody->oa.o_oi = body->oa.o_oi;
+	repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
+
+	/* This would be very bad - accidentally truncating a file when
+	 * changing the time or similar - bug 12203. */
+	if (body->oa.o_valid & OBD_MD_FLSIZE &&
+	    body->oa.o_size != OBD_OBJECT_EOF) {
+		static char mdsinum[48];
+
+		if (body->oa.o_valid & OBD_MD_FLFID)
+			snprintf(mdsinum, sizeof(mdsinum) - 1,
+				 "of parent "DFID, body->oa.o_parent_seq,
+				 body->oa.o_parent_oid, 0);
+		else
+			mdsinum[0] = '\0';
+
+		CERROR("%s: setattr from %s is trying to truncate object "DFID
+		       " %s\n", ofd_name(ofd), obd_export_nid2str(tsi->tsi_exp),
+		       PFID(&tsi->tsi_fid), mdsinum);
+		RETURN(-EPERM);
+	}
+
+	fo = ofd_object_find_exists(tsi->tsi_env, ofd, &tsi->tsi_fid);
+	if (IS_ERR(fo))
+		GOTO(out, rc = PTR_ERR(fo));
+
+	la_from_obdo(&fti->fti_attr, &body->oa, body->oa.o_valid);
+	fti->fti_attr.la_valid &= ~LA_TYPE;
+
+	if (body->oa.o_valid & OBD_MD_FLFID) {
+		ff = &fti->fti_mds_fid;
+		ofd_prepare_fidea(ff, &body->oa);
+	}
+
+	/* setting objects attributes (including owner/group) */
+	rc = ofd_attr_set(tsi->tsi_env, fo, &fti->fti_attr, ff);
+	if (rc != 0)
+		GOTO(out_put, rc);
+
+	obdo_from_la(&repbody->oa, &fti->fti_attr,
+		     OFD_VALID_FLAGS | LA_UID | LA_GID);
+	tgt_drop_id(tsi->tsi_exp, &repbody->oa);
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_SETATTR,
+			 tsi->tsi_jobid, 1);
+	EXIT;
+out_put:
+	ofd_object_put(tsi->tsi_env, fo);
+out:
+	if (rc == 0) {
+		/* we do not call this before to avoid lu_object_find() in
+		 *  ->lvbo_update() holding another reference on the object.
+		 * otherwise concurrent destroy can make the object unavailable
+		 * for 2nd lu_object_find() waiting for the first reference
+		 * to go... deadlock! */
+		res = ldlm_resource_get(ofd->ofd_namespace, NULL,
+					&tsi->tsi_resid, LDLM_EXTENT, 0);
+		if (!IS_ERR(res)) {
+			ldlm_res_lvbo_update(res, NULL, 0);
+			ldlm_resource_putref(res);
+		}
+	}
+	return rc;
+}
+
+static int ofd_orphans_destroy(const struct lu_env *env,
+			       struct obd_export *exp,
+			       struct ofd_device *ofd, struct obdo *oa)
+{
+	struct ofd_thread_info	*info	= ofd_info(env);
+	struct lu_fid		*fid	= &info->fti_fid;
+	struct ost_id		*oi	= &oa->o_oi;
+	struct ofd_seq		*oseq;
+	obd_seq 		 seq	= ostid_seq(oi);
+	obd_id			 end_id = ostid_id(oi);
+	obd_id			 last;
+	obd_id			 oid;
+	int			 skip_orphan;
+	int			 rc	= 0;
+
+	ENTRY;
+
+	oseq = ofd_seq_get(ofd, seq);
+	if (oseq == NULL) {
+		CERROR("%s: Can not find seq for "DOSTID"\n",
+		       ofd_name(ofd), POSTID(oi));
+		RETURN(-EINVAL);
+	}
+
+	*fid = oi->oi_fid;
+	last = ofd_seq_last_oid(oseq);
+	oid = last;
+
+	LASSERT(exp != NULL);
+	skip_orphan = !!(exp_connect_flags(exp) & OBD_CONNECT_SKIP_ORPHAN);
+
+	if (OBD_FAIL_CHECK(OBD_FAIL_OST_NODESTROY))
+		goto done;
+
+	LCONSOLE(D_INFO, "%s: deleting orphan objects from "DOSTID
+		 " to "DOSTID"\n", ofd_name(ofd), seq, end_id + 1, seq, last);
+
+	while (oid > end_id) {
+		rc = fid_set_id(fid, oid);
+		if (unlikely(rc != 0))
+			GOTO(out_put, rc);
+
+		rc = ofd_destroy_by_fid(env, ofd, fid, 1);
+		if (rc != 0 && rc != -ENOENT && rc != -ESTALE &&
+		    likely(rc != -EREMCHG && rc != -EINPROGRESS))
+			/* this is pretty fatal... */
+			CEMERG("%s: error destroying precreated id "
+			       DFID": rc = %d\n",
+			       ofd_name(ofd), PFID(fid), rc);
+
+		oid--;
+		if (!skip_orphan) {
+			ofd_seq_last_oid_set(oseq, oid);
+			/* 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 ((oid & 511) == 0)
+				ofd_seq_last_oid_write(env, ofd, oseq);
+		}
+	}
+
+	CDEBUG(D_HA, "%s: after destroy: set last_id to "DOSTID"\n",
+	       ofd_name(ofd), seq, oid);
+
+done:
+	if (!skip_orphan) {
+		ofd_seq_last_oid_set(oseq, oid);
+		rc = ofd_seq_last_oid_write(env, ofd, oseq);
+	} else {
+		/* don't reuse orphan object, return last used objid */
+		ostid_set_id(oi, last);
+		rc = 0;
+	}
+
+	GOTO(out_put, rc);
+
+out_put:
+	ofd_seq_put(env, oseq);
+	return rc;
+}
+
+static int ofd_create_hdl(struct tgt_session_info *tsi)
+{
+	struct ost_body		*repbody;
+	const struct obdo	*oa = &tsi->tsi_ost_body->oa;
+	struct obdo		*rep_oa;
+	struct obd_export	*exp = tsi->tsi_exp;
+	struct ofd_device	*ofd = ofd_exp(exp);
+	obd_seq			 seq = ostid_seq(&oa->o_oi);
+	obd_id			 oid = ostid_id(&oa->o_oi);
+	struct ofd_seq		*oseq;
+	int			 rc = 0, diff;
+	int			 sync_trans = 0;
+
+	ENTRY;
+
+	if (OBD_FAIL_CHECK(OBD_FAIL_OST_EROFS))
+		RETURN(-EROFS);
+
+	repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+	if (repbody == NULL)
+		RETURN(-ENOMEM);
+
+	down_read(&ofd->ofd_lastid_rwsem);
+	/* Currently, for safe, we do not distinguish which LAST_ID is broken,
+	 * we may do that in the future.
+	 * Return -ENOSPC until the LAST_ID rebuilt. */
+	if (unlikely(ofd->ofd_lastid_rebuilding))
+		GOTO(out_sem, rc = -ENOSPC);
+
+	rep_oa = &repbody->oa;
+	rep_oa->o_oi = oa->o_oi;
+
+	LASSERT(seq >= FID_SEQ_OST_MDT0);
+	LASSERT(oa->o_valid & OBD_MD_FLGROUP);
+
+	CDEBUG(D_INFO, "ofd_create("DOSTID")\n", POSTID(&oa->o_oi));
+
+	oseq = ofd_seq_load(tsi->tsi_env, ofd, seq);
+	if (IS_ERR(oseq)) {
+		CERROR("%s: Can't find FID Sequence "LPX64": rc = %ld\n",
+		       ofd_name(ofd), seq, PTR_ERR(oseq));
+		GOTO(out_sem, rc = -EINVAL);
+	}
+
+	if ((oa->o_valid & OBD_MD_FLFLAGS) &&
+	    (oa->o_flags & OBD_FL_RECREATE_OBJS)) {
+		if (!ofd_obd(ofd)->obd_recovering ||
+		    oid > ofd_seq_last_oid(oseq)) {
+			CERROR("%s: recreate objid "DOSTID" > last id "LPU64
+			       "\n", ofd_name(ofd), POSTID(&oa->o_oi),
+			       ofd_seq_last_oid(oseq));
+			GOTO(out_nolock, rc = -EINVAL);
+		}
+		/* Do nothing here, we re-create objects during recovery
+		 * upon write replay, see ofd_preprw_write() */
+		GOTO(out_nolock, rc = 0);
+	}
+	/* former ofd_handle_precreate */
+	if ((oa->o_valid & OBD_MD_FLFLAGS) &&
+	    (oa->o_flags & OBD_FL_DELORPHAN)) {
+		exp->exp_filter_data.fed_lastid_gen = ofd->ofd_lastid_gen;
+
+		/* destroy orphans */
+		if (lustre_msg_get_conn_cnt(tgt_ses_req(tsi)->rq_reqmsg) <
+		    exp->exp_conn_cnt) {
+			CERROR("%s: dropping old orphan cleanup request\n",
+			       ofd_name(ofd));
+			GOTO(out_nolock, rc = 0);
+		}
+		/* This causes inflight precreates to abort and drop lock */
+		oseq->os_destroys_in_progress = 1;
+		mutex_lock(&oseq->os_create_lock);
+		if (!oseq->os_destroys_in_progress) {
+			CERROR("%s:["LPU64"] destroys_in_progress already"
+			       " cleared\n", ofd_name(ofd), seq);
+			ostid_set_id(&rep_oa->o_oi, ofd_seq_last_oid(oseq));
+			GOTO(out, rc = 0);
+		}
+		diff = oid - ofd_seq_last_oid(oseq);
+		CDEBUG(D_HA, "ofd_last_id() = "LPU64" -> diff = %d\n",
+			ofd_seq_last_oid(oseq), diff);
+		if (-diff > OST_MAX_PRECREATE) {
+			/* FIXME: should reset precreate_next_id on MDS */
+			rc = 0;
+		} else if (diff < 0) {
+			rc = ofd_orphans_destroy(tsi->tsi_env, exp,
+						 ofd, rep_oa);
+			oseq->os_destroys_in_progress = 0;
+		} else {
+			/* XXX: Used by MDS for the first time! */
+			oseq->os_destroys_in_progress = 0;
+		}
+	} else {
+		if (unlikely(exp->exp_filter_data.fed_lastid_gen !=
+			     ofd->ofd_lastid_gen)) {
+			ofd_obd_disconnect(exp);
+			GOTO(out_nolock, rc = -ENOTCONN);
+		}
+
+		mutex_lock(&oseq->os_create_lock);
+		if (lustre_msg_get_conn_cnt(tgt_ses_req(tsi)->rq_reqmsg) <
+		    exp->exp_conn_cnt) {
+			CERROR("%s: dropping old precreate request\n",
+			       ofd_name(ofd));
+			GOTO(out, rc = 0);
+		}
+		/* only precreate if seq is 0, IDIF or normal and also o_id
+		 * must be specfied */
+		if ((!fid_seq_is_mdt(seq) && !fid_seq_is_norm(seq) &&
+		     !fid_seq_is_idif(seq)) || oid == 0) {
+			diff = 1; /* shouldn't we create this right now? */
+		} else {
+			diff = oid - ofd_seq_last_oid(oseq);
+			/* Do sync create if the seq is about to used up */
+			if (fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq)) {
+				if (unlikely(oid >= IDIF_MAX_OID - 1))
+					sync_trans = 1;
+			} else if (fid_seq_is_norm(seq)) {
+				if (unlikely(oid >=
+					     LUSTRE_DATA_SEQ_MAX_WIDTH - 1))
+					sync_trans = 1;
+			} else {
+				CERROR("%s : invalid o_seq "DOSTID"\n",
+				       ofd_name(ofd), POSTID(&oa->o_oi));
+				GOTO(out, rc = -EINVAL);
+			}
+		}
+	}
+	if (diff > 0) {
+		cfs_time_t	 enough_time = cfs_time_shift(DISK_TIMEOUT);
+		obd_id		 next_id;
+		int		 created = 0;
+		int		 count;
+
+		if (!(oa->o_valid & OBD_MD_FLFLAGS) ||
+		    !(oa->o_flags & OBD_FL_DELORPHAN)) {
+			/* don't enforce grant during orphan recovery */
+			rc = ofd_grant_create(tsi->tsi_env,
+					      ofd_obd(ofd)->obd_self_export,
+					      &diff);
+			if (rc) {
+				CDEBUG(D_HA, "%s: failed to acquire grant "
+				       "space for precreate (%d): rc = %d\n",
+				       ofd_name(ofd), diff, rc);
+				diff = 0;
+			}
+		}
+
+		/* This can happen if a new OST is formatted and installed
+		 * in place of an old one at the same index.  Instead of
+		 * precreating potentially millions of deleted old objects
+		 * (possibly filling the OST), only precreate the last batch.
+		 * LFSCK will eventually clean up any orphans. LU-14 */
+		if (diff > 5 * OST_MAX_PRECREATE) {
+			diff = OST_MAX_PRECREATE / 2;
+			LCONSOLE_WARN("%s: precreate FID "DOSTID" is over %u "
+				      "larger than the LAST_ID "DOSTID", only "
+				      "precreating the last %u objects.\n",
+				      ofd_name(ofd), POSTID(&oa->o_oi),
+				      5 * OST_MAX_PRECREATE,
+				      POSTID(&oseq->os_oi), diff);
+			ofd_seq_last_oid_set(oseq, ostid_id(&oa->o_oi) - diff);
+		}
+
+		while (diff > 0) {
+			next_id = ofd_seq_last_oid(oseq) + 1;
+			count = ofd_precreate_batch(ofd, diff);
+
+			CDEBUG(D_HA, "%s: reserve %d objects in group "LPX64
+			       " at "LPU64"\n", ofd_name(ofd),
+			       count, seq, next_id);
+
+			if (cfs_time_after(jiffies, enough_time)) {
+				LCONSOLE_WARN("%s: Slow creates, %d/%d objects"
+					      " created at a rate of %d/s\n",
+					      ofd_name(ofd), created,
+					      diff + created,
+					      created / DISK_TIMEOUT);
+				break;
+			}
+
+			rc = ofd_precreate_objects(tsi->tsi_env, ofd, next_id,
+						   oseq, count, sync_trans);
+			if (rc > 0) {
+				created += rc;
+				diff -= rc;
+			} else if (rc < 0) {
+				break;
+			}
+		}
+		if (created > 0)
+			/* some objects got created, we can return
+			 * them, even if last creation failed */
+			rc = 0;
+		else
+			CERROR("%s: unable to precreate: rc = %d\n",
+			       ofd_name(ofd), rc);
+
+		if (!(oa->o_valid & OBD_MD_FLFLAGS) ||
+		    !(oa->o_flags & OBD_FL_DELORPHAN))
+			ofd_grant_commit(tsi->tsi_env,
+					 ofd_obd(ofd)->obd_self_export, rc);
+
+		ostid_set_id(&rep_oa->o_oi, ofd_seq_last_oid(oseq));
+	}
+	EXIT;
+	ofd_counter_incr(exp, LPROC_OFD_STATS_CREATE,
+			 tsi->tsi_jobid, 1);
+out:
+	mutex_unlock(&oseq->os_create_lock);
+out_nolock:
+	if (rc == 0) {
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 8, 53, 0)
+		struct ofd_thread_info	*info = ofd_info(tsi->tsi_env);
+		struct lu_fid		*fid = &info->fti_fid;
+
+		/* For compatible purpose, it needs to convert back to
+		 * OST ID before put it on wire. */
+		*fid = rep_oa->o_oi.oi_fid;
+		fid_to_ostid(fid, &rep_oa->o_oi);
+#endif
+		rep_oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
+	}
+	ofd_seq_put(tsi->tsi_env, oseq);
+
+out_sem:
+	up_read(&ofd->ofd_lastid_rwsem);
+	return rc;
+}
+
+static int ofd_destroy_hdl(struct tgt_session_info *tsi)
+{
+	const struct ost_body	*body = tsi->tsi_ost_body;
+	struct ost_body		*repbody;
+	struct ofd_device	*ofd = ofd_exp(tsi->tsi_exp);
+	struct ofd_thread_info	*fti = tsi2ofd_info(tsi);
+	struct lu_fid		*fid = &fti->fti_fid;
+	obd_id			 oid;
+	obd_count		 count;
+	int			 rc = 0;
+
+	ENTRY;
+
+	if (OBD_FAIL_CHECK(OBD_FAIL_OST_EROFS))
+		RETURN(-EROFS);
+
+	/* This is old case for clients before Lustre 2.4 */
+	/* If there's a DLM request, cancel the locks mentioned in it */
+	if (req_capsule_field_present(tsi->tsi_pill, &RMF_DLM_REQ,
+				      RCL_CLIENT)) {
+		struct ldlm_request *dlm;
+
+		dlm = req_capsule_client_get(tsi->tsi_pill, &RMF_DLM_REQ);
+		if (dlm == NULL)
+			RETURN(-EFAULT);
+		ldlm_request_cancel(tgt_ses_req(tsi), dlm, 0);
+	}
+
+	*fid = body->oa.o_oi.oi_fid;
+	oid = ostid_id(&body->oa.o_oi);
+	LASSERT(oid != 0);
+
+	repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+
+	/* check that o_misc makes sense */
+	if (body->oa.o_valid & OBD_MD_FLOBJCOUNT)
+		count = body->oa.o_misc;
+	else
+		count = 1; /* default case - single destroy */
+
+	CDEBUG(D_HA, "%s: Destroy object "DOSTID" count %d\n", ofd_name(ofd),
+	       POSTID(&body->oa.o_oi), count);
+
+	while (count > 0) {
+		int lrc;
+
+		lrc = ofd_destroy_by_fid(tsi->tsi_env, ofd, fid, 0);
+		if (lrc == -ENOENT) {
+			CDEBUG(D_INODE,
+			       "%s: destroying non-existent object "DFID"\n",
+			       ofd_name(ofd), PFID(fid));
+			/* rewrite rc with -ENOENT only if it is 0 */
+			if (rc == 0)
+				rc = lrc;
+		} else if (lrc != 0) {
+			CERROR("%s: error destroying object "DFID": %d\n",
+			       ofd_name(ofd), PFID(fid), lrc);
+			rc = lrc;
+		}
+
+		count--;
+		oid++;
+		lrc = fid_set_id(fid, oid);
+		if (unlikely(lrc != 0 && count > 0))
+			GOTO(out, rc = lrc);
+	}
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_DESTROY,
+			 tsi->tsi_jobid, 1);
+
+	GOTO(out, rc);
+
+out:
+	fid_to_ostid(fid, &repbody->oa.o_oi);
+	return rc;
+}
+
+static int ofd_statfs_hdl(struct tgt_session_info *tsi)
+{
+	struct obd_statfs	*osfs;
+	int			 rc;
+
+	ENTRY;
+
+	osfs = req_capsule_server_get(tsi->tsi_pill, &RMF_OBD_STATFS);
+
+	rc = ofd_statfs(tsi->tsi_env, tsi->tsi_exp, osfs,
+			cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS), 0);
+	if (rc != 0)
+		CERROR("%s: statfs failed: rc = %d\n",
+		       tgt_name(tsi->tsi_tgt), rc);
+
+	if (OBD_FAIL_CHECK(OBD_FAIL_OST_STATFS_EINPROGRESS))
+		rc = -EINPROGRESS;
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_STATFS,
+			 tsi->tsi_jobid, 1);
+
+	RETURN(rc);
+}
+
+static int ofd_sync_hdl(struct tgt_session_info *tsi)
+{
+	struct ost_body		*body = tsi->tsi_ost_body;
+	struct ost_body		*repbody;
+	struct ofd_thread_info	*fti = tsi2ofd_info(tsi);
+	struct ofd_device	*ofd = ofd_exp(tsi->tsi_exp);
+	struct ofd_object	*fo = NULL;
+	int			 rc = 0;
+
+	ENTRY;
+
+	repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+
+	/* if no objid is specified, it means "sync whole filesystem" */
+	if (!fid_is_zero(&tsi->tsi_fid)) {
+		fo = ofd_object_find_exists(tsi->tsi_env, ofd, &tsi->tsi_fid);
+		if (IS_ERR(fo))
+			RETURN(PTR_ERR(fo));
+	}
+
+	rc = tgt_sync(tsi->tsi_env, tsi->tsi_tgt,
+		      fo != NULL ? ofd_object_child(fo) : NULL,
+		      repbody->oa.o_size, repbody->oa.o_blocks);
+	if (rc)
+		GOTO(put, rc);
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_SYNC,
+			 tsi->tsi_jobid, 1);
+	if (fo == NULL)
+		RETURN(0);
+
+	repbody->oa.o_oi = body->oa.o_oi;
+	repbody->oa.o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
+
+	rc = ofd_attr_get(tsi->tsi_env, fo, &fti->fti_attr);
+	if (rc == 0)
+		obdo_from_la(&repbody->oa, &fti->fti_attr,
+			     OFD_VALID_FLAGS);
+	else
+		/* don't return rc from getattr */
+		rc = 0;
+	EXIT;
+put:
+	if (fo != NULL)
+		ofd_object_put(tsi->tsi_env, fo);
+	return rc;
+}
+
+static int ofd_punch_hdl(struct tgt_session_info *tsi)
+{
+	const struct obdo	*oa = &tsi->tsi_ost_body->oa;
+	struct ost_body		*repbody;
+	struct ofd_thread_info	*info = tsi2ofd_info(tsi);
+	struct ldlm_namespace	*ns = tsi->tsi_tgt->lut_obd->obd_namespace;
+	struct ldlm_resource	*res;
+	struct ofd_object	*fo;
+	struct filter_fid	*ff = NULL;
+	__u64			 flags = 0;
+	struct lustre_handle	 lh = { 0, };
+	int			 rc;
+	__u64			 start, end;
+	bool			 srvlock;
+
+	ENTRY;
+
+	/* check that we do support OBD_CONNECT_TRUNCLOCK. */
+	CLASSERT(OST_CONNECT_SUPPORTED & OBD_CONNECT_TRUNCLOCK);
+
+	if ((oa->o_valid & (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS)) !=
+	    (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS))
+		RETURN(err_serious(-EPROTO));
+
+	repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
+	if (repbody == NULL)
+		RETURN(err_serious(-ENOMEM));
+
+	/* punch start,end are passed in o_size,o_blocks throught wire */
+	start = oa->o_size;
+	end = oa->o_blocks;
+
+	if (end != OBD_OBJECT_EOF) /* Only truncate is supported */
+		RETURN(-EPROTO);
+
+	/* standard truncate optimization: if file body is completely
+	 * destroyed, don't send data back to the server. */
+	if (start == 0)
+		flags |= LDLM_FL_AST_DISCARD_DATA;
+
+	repbody->oa.o_oi = oa->o_oi;
+	repbody->oa.o_valid = OBD_MD_FLID;
+
+	srvlock = oa->o_valid & OBD_MD_FLFLAGS &&
+		  oa->o_flags & OBD_FL_SRVLOCK;
+
+	if (srvlock) {
+		rc = tgt_extent_lock(ns, &tsi->tsi_resid, start, end, &lh,
+				     LCK_PW, &flags);
+		if (rc != 0)
+			RETURN(rc);
+	}
+
+	CDEBUG(D_INODE, "calling punch for object "DFID", valid = "LPX64
+	       ", start = "LPD64", end = "LPD64"\n", PFID(&tsi->tsi_fid),
+	       oa->o_valid, start, end);
+
+	fo = ofd_object_find_exists(tsi->tsi_env, ofd_exp(tsi->tsi_exp),
+				    &tsi->tsi_fid);
+	if (IS_ERR(fo))
+		GOTO(out, rc = PTR_ERR(fo));
+
+	la_from_obdo(&info->fti_attr, oa,
+		     OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME);
+	info->fti_attr.la_size = start;
+	info->fti_attr.la_valid |= LA_SIZE;
+
+	if (oa->o_valid & OBD_MD_FLFID) {
+		ff = &info->fti_mds_fid;
+		ofd_prepare_fidea(ff, oa);
+	}
+
+	rc = ofd_object_punch(tsi->tsi_env, fo, start, end, &info->fti_attr,
+			      ff, (struct obdo *)oa);
+	if (rc)
+		GOTO(out_put, rc);
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_PUNCH,
+			 tsi->tsi_jobid, 1);
+	EXIT;
+out_put:
+	ofd_object_put(tsi->tsi_env, fo);
+out:
+	if (srvlock)
+		tgt_extent_unlock(&lh, LCK_PW);
+	if (rc == 0) {
+		/* we do not call this before to avoid lu_object_find() in
+		 *  ->lvbo_update() holding another reference on the object.
+		 * otherwise concurrent destroy can make the object unavailable
+		 * for 2nd lu_object_find() waiting for the first reference
+		 * to go... deadlock! */
+		res = ldlm_resource_get(ns, NULL, &tsi->tsi_resid,
+				        LDLM_EXTENT, 0);
+		if (!IS_ERR(res)) {
+			ldlm_res_lvbo_update(res, NULL, 0);
+			ldlm_resource_putref(res);
+		}
+	}
+	return rc;
+}
+
+static int ofd_quotactl(struct tgt_session_info *tsi)
+{
+	struct obd_quotactl	*oqctl, *repoqc;
+	int			 rc;
+
+	ENTRY;
+
+	oqctl = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_QUOTACTL);
+	if (oqctl == NULL)
+		RETURN(err_serious(-EPROTO));
+
+	repoqc = req_capsule_server_get(tsi->tsi_pill, &RMF_OBD_QUOTACTL);
+	if (repoqc == NULL)
+		RETURN(err_serious(-ENOMEM));
+
+	/* report success for quota on/off for interoperability with current MDT
+	 * stack */
+	if (oqctl->qc_cmd == Q_QUOTAON || oqctl->qc_cmd == Q_QUOTAOFF)
+		RETURN(0);
+
+	*repoqc = *oqctl;
+	rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, repoqc);
+
+	ofd_counter_incr(tsi->tsi_exp, LPROC_OFD_STATS_QUOTACTL,
+			 tsi->tsi_jobid, 1);
+
+	RETURN(rc);
+}
+
+/* High priority request handlers for OFD */
+
+/* prolong locks for the current service time of the corresponding
+ * portal (= OST_IO_PORTAL)
+ */
+static inline int prolong_timeout(struct ptlrpc_request *req)
+{
+	struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
+
+	if (AT_OFF)
+		return obd_timeout / 2;
+
+	return max(at_est2timeout(at_get(&svcpt->scp_at_estimate)),
+		   ldlm_timeout);
+}
+
+static int ofd_prolong_one_lock(struct tgt_session_info *tsi,
+				struct ldlm_lock *lock,
+				struct ldlm_extent *extent, int timeout)
+{
+
+	if (lock->l_flags & LDLM_FL_DESTROYED) /* lock already cancelled */
+		return 0;
+
+	/* XXX: never try to grab resource lock here because we're inside
+	 * exp_bl_list_lock; in ldlm_lockd.c to handle waiting list we take
+	 * res lock and then exp_bl_list_lock. */
+
+	if (!(lock->l_flags & LDLM_FL_AST_SENT))
+		/* ignore locks not being cancelled */
+		return 0;
+
+	LDLM_DEBUG(lock, "refreshed for req x"LPU64" ext("LPU64"->"LPU64") "
+			 "to %ds.\n", tgt_ses_req(tsi)->rq_xid, extent->start,
+			 extent->end, timeout);
+
+	/* OK. this is a possible lock the user holds doing I/O
+	 * let's refresh eviction timer for it */
+	ldlm_refresh_waiting_lock(lock, timeout);
+	return 1;
+}
+
+static int ofd_prolong_extent_locks(struct tgt_session_info *tsi,
+				    __u64 start, __u64 end)
+{
+	struct obd_export	*exp = tsi->tsi_exp;
+	struct obdo		*oa  = &tsi->tsi_ost_body->oa;
+	struct ldlm_extent	 extent = {
+		.start = start,
+		.end = end
+	};
+	struct ldlm_lock	*lock;
+	int			 timeout = prolong_timeout(tgt_ses_req(tsi));
+	int			 lock_count = 0;
+
+	ENTRY;
+
+	if (oa->o_valid & OBD_MD_FLHANDLE) {
+		/* mostly a request should be covered by only one lock, try
+		 * fast path. */
+		lock = ldlm_handle2lock(&oa->o_handle);
+		if (lock != NULL) {
+			/* Fast path to check if the lock covers the whole IO
+			 * region exclusively. */
+			if (lock->l_granted_mode == LCK_PW &&
+			    ldlm_extent_contain(&lock->l_policy_data.l_extent,
+						&extent)) {
+				/* bingo */
+				LASSERT(lock->l_export == exp);
+				lock_count = ofd_prolong_one_lock(tsi, lock,
+							     &extent, timeout);
+				LDLM_LOCK_PUT(lock);
+				RETURN(lock_count);
+			}
+			LDLM_LOCK_PUT(lock);
+		}
+	}
+
+	spin_lock_bh(&exp->exp_bl_list_lock);
+	list_for_each_entry(lock, &exp->exp_bl_list, l_exp_list) {
+		LASSERT(lock->l_flags & LDLM_FL_AST_SENT);
+		LASSERT(lock->l_resource->lr_type == LDLM_EXTENT);
+
+		if (!ldlm_res_eq(&tsi->tsi_resid, &lock->l_resource->lr_name))
+			continue;
+
+		if (!ldlm_extent_overlap(&lock->l_policy_data.l_extent,
+					 &extent))
+			continue;
+
+		lock_count += ofd_prolong_one_lock(tsi, lock, &extent, timeout);
+	}
+	spin_unlock_bh(&exp->exp_bl_list_lock);
+
+	RETURN(lock_count);
+}
+
+/**
+ * Returns 1 if the given PTLRPC matches the given LDLM lock, or 0 if it does
+ * not.
+ */
+static int ofd_rw_hpreq_lock_match(struct ptlrpc_request *req,
+				   struct ldlm_lock *lock)
+{
+	struct niobuf_remote	*rnb;
+	struct obd_ioobj	*ioo;
+	ldlm_mode_t		 mode;
+	struct ldlm_extent	 ext;
+	__u32			 opc = lustre_msg_get_opc(req->rq_reqmsg);
+
+	ENTRY;
+
+	ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
+	LASSERT(ioo != NULL);
+
+	rnb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
+	LASSERT(rnb != NULL);
+
+	ext.start = rnb->offset;
+	rnb += ioo->ioo_bufcnt - 1;
+	ext.end = rnb->offset + rnb->len - 1;
+
+	LASSERT(lock->l_resource != NULL);
+	if (!ostid_res_name_eq(&ioo->ioo_oid, &lock->l_resource->lr_name))
+		RETURN(0);
+
+	mode = LCK_PW;
+	if (opc == OST_READ)
+		mode |= LCK_PR;
+
+	if (!(lock->l_granted_mode & mode))
+		RETURN(0);
+
+	RETURN(ldlm_extent_overlap(&lock->l_policy_data.l_extent, &ext));
+}
+
+/**
+ * High-priority queue request check for whether the given PTLRPC request
+ * (\a req) is blocking an LDLM lock cancel.
+ *
+ * Returns 1 if the given given PTLRPC request (\a req) is blocking an LDLM lock
+ * cancel, 0 if it is not, and -EFAULT if the request is malformed.
+ *
+ * Only OST_READs, OST_WRITEs and OST_PUNCHes go on the h-p RPC queue.  This
+ * function looks only at OST_READs and OST_WRITEs.
+ */
+static int ofd_rw_hpreq_check(struct ptlrpc_request *req)
+{
+	struct tgt_session_info	*tsi;
+	struct obd_ioobj	*ioo;
+	struct niobuf_remote	*rnb;
+	__u64			 start, end;
+	int			 lock_count;
+
+	ENTRY;
+
+	/* Don't use tgt_ses_info() to get session info, because lock_match()
+	 * can be called while request has no processing thread yet. */
+	tsi = lu_context_key_get(&req->rq_session, &tgt_session_key);
+	LASSERT(tsi != NULL);
+
+	/*
+	 * Use LASSERT below because malformed RPCs should have
+	 * been filtered out in tgt_hpreq_handler().
+	 */
+	ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
+	LASSERT(ioo != NULL);
+
+	rnb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
+	LASSERT(rnb != NULL);
+	LASSERT(!(rnb->flags & OBD_BRW_SRVLOCK));
+
+	start = rnb->offset;
+	rnb += ioo->ioo_bufcnt - 1;
+	end = rnb->offset + rnb->len - 1;
+
+	DEBUG_REQ(D_RPCTRACE, req, "%s %s: refresh rw locks: "DFID
+				   " ("LPU64"->"LPU64")\n",
+		  tgt_name(tsi->tsi_tgt), current->comm,
+		  PFID(&tsi->tsi_fid), start, end);
+
+	lock_count = ofd_prolong_extent_locks(tsi, start, end);
+
+	CDEBUG(D_DLMTRACE, "%s: refreshed %u locks timeout for req %p.\n",
+	       tgt_name(tsi->tsi_tgt), lock_count, req);
+
+	RETURN(lock_count > 0);
+}
+
+static void ofd_rw_hpreq_fini(struct ptlrpc_request *req)
+{
+	ofd_rw_hpreq_check(req);
+}
+
+/**
+ * Like tgt_rw_hpreq_lock_match(), but for OST_PUNCH RPCs.
+ */
+static int ofd_punch_hpreq_lock_match(struct ptlrpc_request *req,
+				      struct ldlm_lock *lock)
+{
+	struct tgt_session_info	*tsi;
+
+	/* Don't use tgt_ses_info() to get session info, because lock_match()
+	 * can be called while request has no processing thread yet. */
+	tsi = lu_context_key_get(&req->rq_session, &tgt_session_key);
+	LASSERT(tsi != NULL);
+
+	LASSERT(tsi->tsi_ost_body != NULL);
+	if (tsi->tsi_ost_body->oa.o_valid & OBD_MD_FLHANDLE &&
+	    tsi->tsi_ost_body->oa.o_handle.cookie == lock->l_handle.h_cookie)
+		return 1;
+
+	return 0;
+}
+
+/**
+ * Like ost_rw_hpreq_check(), but for OST_PUNCH RPCs.
+ */
+static int ofd_punch_hpreq_check(struct ptlrpc_request *req)
+{
+	struct tgt_session_info	*tsi;
+	struct obdo		*oa;
+	int			 lock_count;
+
+	ENTRY;
+
+	/* Don't use tgt_ses_info() to get session info, because lock_match()
+	 * can be called while request has no processing thread yet. */
+	tsi = lu_context_key_get(&req->rq_session, &tgt_session_key);
+	LASSERT(tsi != NULL);
+	oa = &tsi->tsi_ost_body->oa;
+
+	LASSERT(!(oa->o_valid & OBD_MD_FLFLAGS &&
+		  oa->o_flags & OBD_FL_SRVLOCK));
+
+	CDEBUG(D_DLMTRACE,
+	       "%s: refresh locks: "LPU64"/"LPU64" ("LPU64"->"LPU64")\n",
+	       tgt_name(tsi->tsi_tgt), tsi->tsi_resid.name[0],
+	       tsi->tsi_resid.name[1], oa->o_size, oa->o_blocks);
+
+	lock_count = ofd_prolong_extent_locks(tsi, oa->o_size, oa->o_blocks);
+
+	CDEBUG(D_DLMTRACE, "%s: refreshed %u locks timeout for req %p.\n",
+	       tgt_name(tsi->tsi_tgt), lock_count, req);
+
+	RETURN(lock_count > 0);
+}
+
+static void ofd_punch_hpreq_fini(struct ptlrpc_request *req)
+{
+	ofd_punch_hpreq_check(req);
+}
+
+struct ptlrpc_hpreq_ops ofd_hpreq_rw = {
+	.hpreq_lock_match	= ofd_rw_hpreq_lock_match,
+	.hpreq_check		= ofd_rw_hpreq_check,
+	.hpreq_fini		= ofd_rw_hpreq_fini
+};
+
+struct ptlrpc_hpreq_ops ofd_hpreq_punch = {
+	.hpreq_lock_match	= ofd_punch_hpreq_lock_match,
+	.hpreq_check		= ofd_punch_hpreq_check,
+	.hpreq_fini		= ofd_punch_hpreq_fini
+};
+
+/** Assign high priority operations to the IO requests */
+static void ofd_hp_brw(struct tgt_session_info *tsi)
+{
+	struct niobuf_remote	*rnb;
+	struct obd_ioobj	*ioo;
+
+	ENTRY;
+
+	ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
+	LASSERT(ioo != NULL); /* must exist after request preprocessing */
+	if (ioo->ioo_bufcnt > 0) {
+		rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
+		LASSERT(rnb != NULL); /* must exist after request preprocessing */
+
+		/* no high priority if server lock is needed */
+		if (rnb->flags & OBD_BRW_SRVLOCK)
+			return;
+	}
+	tgt_ses_req(tsi)->rq_ops = &ofd_hpreq_rw;
+}
+
+static void ofd_hp_punch(struct tgt_session_info *tsi)
+{
+	LASSERT(tsi->tsi_ost_body != NULL); /* must exists if we are here */
+	/* no high-priority if server lock is needed */
+	if (tsi->tsi_ost_body->oa.o_valid & OBD_MD_FLFLAGS &&
+	    tsi->tsi_ost_body->oa.o_flags & OBD_FL_SRVLOCK)
+		return;
+	tgt_ses_req(tsi)->rq_ops = &ofd_hpreq_punch;
+}
+
+#define OBD_FAIL_OST_READ_NET	OBD_FAIL_OST_BRW_NET
+#define OBD_FAIL_OST_WRITE_NET	OBD_FAIL_OST_BRW_NET
+#define OST_BRW_READ	OST_READ
+#define OST_BRW_WRITE	OST_WRITE
+
+static struct tgt_handler ofd_tgt_handlers[] = {
+TGT_RPC_HANDLER(OST_FIRST_OPC,
+		0,			OST_CONNECT,	tgt_connect,
+		&RQF_CONNECT, LUSTRE_OBD_VERSION),
+TGT_RPC_HANDLER(OST_FIRST_OPC,
+		0,			OST_DISCONNECT,	tgt_disconnect,
+		&RQF_OST_DISCONNECT, LUSTRE_OBD_VERSION),
+TGT_RPC_HANDLER(OST_FIRST_OPC,
+		0,			OST_SET_INFO,	ofd_set_info_hdl,
+		&RQF_OBD_SET_INFO, LUSTRE_OST_VERSION),
+TGT_OST_HDL(0,				OST_GET_INFO,	ofd_get_info_hdl),
+TGT_OST_HDL(HABEO_CORPUS| HABEO_REFERO,	OST_GETATTR,	ofd_getattr_hdl),
+TGT_OST_HDL(HABEO_CORPUS| HABEO_REFERO | MUTABOR,
+					OST_SETATTR,	ofd_setattr_hdl),
+TGT_OST_HDL(0		| HABEO_REFERO | MUTABOR,
+					OST_CREATE,	ofd_create_hdl),
+TGT_OST_HDL(0		| HABEO_REFERO | MUTABOR,
+					OST_DESTROY,	ofd_destroy_hdl),
+TGT_OST_HDL(0		| HABEO_REFERO,	OST_STATFS,	ofd_statfs_hdl),
+TGT_OST_HDL_HP(HABEO_CORPUS| HABEO_REFERO,
+					OST_BRW_READ,	tgt_brw_read,
+							ofd_hp_brw),
+/* don't set CORPUS flag for brw_write because -ENOENT may be valid case */
+TGT_OST_HDL_HP(HABEO_CORPUS| MUTABOR,	OST_BRW_WRITE,	tgt_brw_write,
+							ofd_hp_brw),
+TGT_OST_HDL_HP(HABEO_CORPUS| HABEO_REFERO | MUTABOR,
+					OST_PUNCH,	ofd_punch_hdl,
+							ofd_hp_punch),
+TGT_OST_HDL(HABEO_CORPUS| HABEO_REFERO,	OST_SYNC,	ofd_sync_hdl),
+TGT_OST_HDL(0		| HABEO_REFERO,	OST_QUOTACTL,	ofd_quotactl),
+};
+
 static struct tgt_opc_slice ofd_common_slice[] = {
 	{
-		.tos_opc_start = UPDATE_OBJ,
-		.tos_opc_end   = UPDATE_LAST_OPC,
-		.tos_hs        = tgt_out_handlers
+		.tos_opc_start	= OST_FIRST_OPC,
+		.tos_opc_end	= OST_LAST_OPC,
+		.tos_hs		= ofd_tgt_handlers
+	},
+	{
+		.tos_opc_start	= OBD_FIRST_OPC,
+		.tos_opc_end	= OBD_LAST_OPC,
+		.tos_hs		= tgt_obd_handlers
+	},
+	{
+		.tos_opc_start	= LDLM_FIRST_OPC,
+		.tos_opc_end	= LDLM_LAST_OPC,
+		.tos_hs		= tgt_dlm_handlers
+	},
+	{
+		.tos_opc_start	= OUT_UPDATE_FIRST_OPC,
+		.tos_opc_end	= OUT_UPDATE_LAST_OPC,
+		.tos_hs		= tgt_out_handlers
+	},
+	{
+		.tos_opc_start	= SEQ_FIRST_OPC,
+		.tos_opc_end	= SEQ_LAST_OPC,
+		.tos_hs		= seq_handlers
+	},
+	{
+		.tos_opc_start	= LFSCK_FIRST_OPC,
+		.tos_opc_end	= LFSCK_LAST_OPC,
+		.tos_hs		= tgt_lfsck_handlers
 	},
 	{
 		.tos_hs		= NULL
@@ -652,6 +2115,7 @@ static int ofd_init0(const struct lu_env *env, struct ofd_device *m,
 	m->ofd_syncjournal = 0;
 	ofd_slc_set(m);
 	m->ofd_grant_compat_disable = 0;
+	m->ofd_soft_sync_limit = OFD_SOFT_SYNC_LIMIT_DEFAULT;
 
 	/* statfs data */
 	spin_lock_init(&m->ofd_osfs_lock);
@@ -666,10 +2130,12 @@ static int ofd_init0(const struct lu_env *env, struct ofd_device *m,
 	m->ofd_tot_granted = 0;
 	m->ofd_tot_pending = 0;
 	m->ofd_seq_count = 0;
+	init_waitqueue_head(&m->ofd_inconsistency_thread.t_ctl_waitq);
+	INIT_LIST_HEAD(&m->ofd_inconsistency_list);
+	spin_lock_init(&m->ofd_inconsistency_lock);
 
 	spin_lock_init(&m->ofd_batch_lock);
-	rwlock_init(&obd->u.filter.fo_sptlrpc_lock);
-	sptlrpc_rule_set_init(&obd->u.filter.fo_sptlrpc_rset);
+	init_rwsem(&m->ofd_lastid_rwsem);
 
 	obd->u.filter.fo_fl_oss_capa = 0;
 	CFS_INIT_LIST_HEAD(&obd->u.filter.fo_capa_keys);
@@ -769,7 +2235,14 @@ static int ofd_init0(const struct lu_env *env, struct ofd_device *m,
 	if (rc)
 		GOTO(err_fini_lut, rc);
 
+	rc = ofd_start_inconsistency_verification_thread(m);
+	if (rc != 0)
+		GOTO(err_fini_fs, rc);
+
 	RETURN(0);
+
+err_fini_fs:
+	ofd_fs_cleanup(env, m);
 err_fini_lut:
 	tgt_fini(env, &m->ofd_lut);
 err_free_ns:
@@ -784,16 +2257,20 @@ err_fini_proc:
 
 static void ofd_fini(const struct lu_env *env, struct ofd_device *m)
 {
-	struct obd_device *obd = ofd_obd(m);
-	struct lu_device  *d = &m->ofd_dt_dev.dd_lu_dev;
+	struct obd_device	*obd = ofd_obd(m);
+	struct lu_device	*d   = &m->ofd_dt_dev.dd_lu_dev;
+	struct lfsck_stop	 stop;
 
-	lfsck_stop(env, m->ofd_osd, true);
-	lfsck_degister(env, m->ofd_osd);
+	stop.ls_status = LS_PAUSED;
+	stop.ls_flags = 0;
+	lfsck_stop(env, m->ofd_osd, &stop);
 	target_recovery_fini(obd);
 	obd_exports_barrier(obd);
 	obd_zombie_barrier();
 
 	tgt_fini(env, &m->ofd_lut);
+	ofd_stop_inconsistency_verification_thread(m);
+	lfsck_degister(env, m->ofd_osd);
 	ofd_fs_cleanup(env, m);
 
 	ofd_free_capa_keys(m);
@@ -807,8 +2284,8 @@ static void ofd_fini(const struct lu_env *env, struct ofd_device *m)
 
 	ofd_stack_fini(env, m, &m->ofd_dt_dev.dd_lu_dev);
 	ofd_procfs_fini(m);
-	LASSERT(cfs_atomic_read(&d->ld_ref) == 0);
-	server_put_mount(obd->obd_name, NULL);
+	LASSERT(atomic_read(&d->ld_ref) == 0);
+	server_put_mount(obd->obd_name, true);
 	EXIT;
 }
 
@@ -865,11 +2342,7 @@ static void ofd_key_exit(const struct lu_context *ctx,
 	info->fti_exp = NULL;
 
 	info->fti_xid = 0;
-	info->fti_transno = 0;
 	info->fti_pre_version = 0;
-	info->fti_obj = NULL;
-	info->fti_has_trans = 0;
-	info->fti_mult_trans = 0;
 	info->fti_used = 0;
 
 	memset(&info->fti_attr, 0, sizeof info->fti_attr);
@@ -906,7 +2379,6 @@ static struct lu_device_type ofd_device_type = {
 
 int __init ofd_init(void)
 {
-	struct lprocfs_static_vars	lvars;
 	int				rc;
 
 	rc = lu_kmem_init(ofd_caches);
@@ -919,9 +2391,10 @@ int __init ofd_init(void)
 		return(rc);
 	}
 
-	lprocfs_ofd_init_vars(&lvars);
-
-	rc = class_register_type(&ofd_obd_ops, NULL, lvars.module_vars,
+	rc = class_register_type(&ofd_obd_ops, NULL, true, NULL,
+#ifndef HAVE_ONLY_PROCFS_SEQ
+				 NULL,
+#endif
 				 LUSTRE_OST_NAME, &ofd_device_type);
 	return rc;
 }