Merge tag 'staging-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging/iio driver updates from Greg KH: "Here is the big staging and iio driver patchsets for 4.11-rc1. We almost broke even this time around, with only a few thousand lines added overall, as we removed the old and obsolete i4l code, but added some new drivers for the RPi platform, as well as adding some new IIO drivers. All of these have been in linux-next for a while with no reported issues" * tag 'staging-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (669 commits) Staging: vc04_services: Fix the "space prohibited" code style errors Staging: vc04_services: Fix the "wrong indent" code style errors staging: octeon: Use net_device_stats from struct net_device Staging: rtl8192u: ieee80211: ieee80211.h - style fix Staging: rtl8192u: ieee80211: ieee80211_tx.c - style fix Staging: rtl8192u: ieee80211: rtl819x_BAProc.c - style fix Staging: rtl8192u: ieee80211: ieee80211_module.c - style fix Staging: rtl8192u: ieee80211: rtl819x_TSProc.c - style fix Staging: rtl8192u: r8192U.h - style fix Staging: rtl8192u: r8192U_core.c - style fix Staging: rtl8192u: r819xU_cmdpkt.c - style fix staging: rtl8192u: blank lines aren't necessary before a close brace '}' staging: rtl8192u: Adding space after enum and struct definition staging: rtl8192u: Adding space after struct definition Staging: ks7010: Add required and preferred spaces around operators Staging: ks7010: ks*: Remove redundant blank lines Staging: ks7010: ks*: Add missing blank lines after declarations staging: visorbus, replace init_timer with setup_timer staging: vt6656: rxtx.c Removed multiple dereferencing staging: vt6656: Alignment match open parenthesis ...
author: Linus Torvalds <torvalds@linux-foundation.org> 2017-02-22 12:14:01 -0800
committer: Linus Torvalds <torvalds@linux-foundation.org> 2017-02-22 12:14:01 -0800
commit: caa59428971d5ad81d19512365c9ba580d83268c (patch)
tree: cd9615719bad9a97f02bb5bc1021396a1b484762 /drivers/staging/lustre/lustre
parent: Merge tag 'driver-core-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core (diff)
parent: Staging: vc04_services: Fix the "space prohibited" code style errors (diff)
download: linux-dev-caa59428971d5ad81d19512365c9ba580d83268c.tar.xz
linux-dev-caa59428971d5ad81d19512365c9ba580d83268c.zip
78 files changed, 1401 insertions, 1119 deletions
diff --git a/drivers/staging/lustre/lustre/fid/fid_lib.c b/drivers/staging/lustre/lustre/fid/fid_lib.c
index 4e49cb356d64..9eb405905d1a 100644
--- a/drivers/staging/lustre/lustre/fid/fid_lib.c
+++ b/drivers/staging/lustre/lustre/fid/fid_lib.c
@@ -60,14 +60,13 @@
  * FID_SEQ_START + 2 is for .lustre directory and its objects
  */
 const struct lu_seq_range LUSTRE_SEQ_SPACE_RANGE = {
-	FID_SEQ_NORMAL,
-	(__u64)~0ULL
+	.lsr_start	= FID_SEQ_NORMAL,
+	.lsr_end	= (__u64)~0ULL,
 };
 
 /* Zero range, used for init and other purposes. */
 const struct lu_seq_range LUSTRE_SEQ_ZERO_RANGE = {
-	0,
-	0
+	.lsr_start	= 0,
 };
 
 /* Lustre Big Fs Lock fid. */
diff --git a/drivers/staging/lustre/lustre/fid/lproc_fid.c b/drivers/staging/lustre/lustre/fid/lproc_fid.c
index 97d4849c7199..3eed83808545 100644
--- a/drivers/staging/lustre/lustre/fid/lproc_fid.c
+++ b/drivers/staging/lustre/lustre/fid/lproc_fid.c
@@ -203,9 +203,13 @@ LPROC_SEQ_FOPS_RO(ldebugfs_fid_server);
 LPROC_SEQ_FOPS_RO(ldebugfs_fid_fid);
 
 struct lprocfs_vars seq_client_debugfs_list[] = {
-	{ "space", &ldebugfs_fid_space_fops },
-	{ "width", &ldebugfs_fid_width_fops },
-	{ "server", &ldebugfs_fid_server_fops },
-	{ "fid", &ldebugfs_fid_fid_fops },
+	{ .name =	"space",
+	  .fops =	&ldebugfs_fid_space_fops },
+	{ .name	=	"width",
+	  .fops =	&ldebugfs_fid_width_fops },
+	{ .name =	"server",
+	  .fops =	&ldebugfs_fid_server_fops },
+	{ .name	=	"fid",
+	  .fops =	&ldebugfs_fid_fid_fops },
 	{ NULL }
 };
diff --git a/drivers/staging/lustre/lustre/include/cl_object.h b/drivers/staging/lustre/lustre/include/cl_object.h
index dc685610c4c4..e4c0c440f01b 100644
--- a/drivers/staging/lustre/lustre/include/cl_object.h
+++ b/drivers/staging/lustre/lustre/include/cl_object.h
@@ -284,12 +284,6 @@ struct cl_layout {
 	size_t		cl_size;
 	/** Layout generation. */
 	u32		cl_layout_gen;
-	/**
-	 * True if this is a released file.
-	 * Temporarily added for released file truncate in ll_setattr_raw().
-	 * It will be removed later. -Jinshan
-	 */
-	bool		cl_is_released;
 };
 
 /**
@@ -1458,8 +1452,10 @@ struct cl_read_ahead {
 	 * cra_end is included.
 	 */
 	pgoff_t cra_end;
+	/* optimal RPC size for this read, by pages */
+	unsigned long cra_rpc_size;
 	/*
-	 * Release routine. If readahead holds resources underneath, this
+	 * Release callback. If readahead holds resources underneath, this
 	 * function should be called to release it.
 	 */
 	void (*cra_release)(const struct lu_env *env, void *cbdata);
@@ -2311,7 +2307,7 @@ struct cl_io *cl_io_top(struct cl_io *io);
 do {									\
 	typeof(foo_io) __foo_io = (foo_io);				\
 									\
-	CLASSERT(offsetof(typeof(*__foo_io), base) == 0);		\
+	BUILD_BUG_ON(offsetof(typeof(*__foo_io), base) != 0);		\
 	memset(&__foo_io->base + 1, 0,					\
 	       sizeof(*__foo_io) - sizeof(__foo_io->base));		\
 } while (0)
diff --git a/drivers/staging/lustre/lustre/include/interval_tree.h b/drivers/staging/lustre/lustre/include/interval_tree.h
index 5d387d372547..0d4f92ec8334 100644
--- a/drivers/staging/lustre/lustre/include/interval_tree.h
+++ b/drivers/staging/lustre/lustre/include/interval_tree.h
@@ -36,7 +36,9 @@
 #ifndef _INTERVAL_H__
 #define _INTERVAL_H__
 
-#include "../../include/linux/libcfs/libcfs.h"	/* LASSERT. */
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
 
 struct interval_node {
 	struct interval_node   *in_left;
@@ -73,13 +75,15 @@ static inline __u64 interval_high(struct interval_node *node)
 	return node->in_extent.end;
 }
 
-static inline void interval_set(struct interval_node *node,
-				__u64 start, __u64 end)
+static inline int interval_set(struct interval_node *node,
+			       __u64 start, __u64 end)
 {
-	LASSERT(start <= end);
+	if (start > end)
+		return -ERANGE;
 	node->in_extent.start = start;
 	node->in_extent.end = end;
 	node->in_max_high = end;
+	return 0;
 }
 
 /*
diff --git a/drivers/staging/lustre/lustre/include/lu_object.h b/drivers/staging/lustre/lustre/include/lu_object.h
index 260643ee0d48..7a4f412a85a3 100644
--- a/drivers/staging/lustre/lustre/include/lu_object.h
+++ b/drivers/staging/lustre/lustre/include/lu_object.h
@@ -34,6 +34,7 @@
 #define __LUSTRE_LU_OBJECT_H
 
 #include <stdarg.h>
+#include <linux/percpu_counter.h>
 #include "../../include/linux/libcfs/libcfs.h"
 #include "lustre/lustre_idl.h"
 #include "lu_ref.h"
@@ -580,7 +581,6 @@ enum {
 	LU_SS_CACHE_RACE,
 	LU_SS_CACHE_DEATH_RACE,
 	LU_SS_LRU_PURGED,
-	LU_SS_LRU_LEN,	/* # of objects in lsb_lru lists */
 	LU_SS_LAST_STAT
 };
 
@@ -635,6 +635,10 @@ struct lu_site {
 	 * XXX: a hack! fld has to find md_site via site, remove when possible
 	 */
 	struct seq_server_site	*ld_seq_site;
+	/**
+	 * Number of objects in lsb_lru_lists - used for shrinking
+	 */
+	struct percpu_counter	 ls_lru_len_counter;
 };
 
 static inline struct lu_site_bkt_data *
@@ -708,8 +712,14 @@ static inline int lu_object_is_dying(const struct lu_object_header *h)
 
 void lu_object_put(const struct lu_env *env, struct lu_object *o);
 void lu_object_unhash(const struct lu_env *env, struct lu_object *o);
+int lu_site_purge_objects(const struct lu_env *env, struct lu_site *s, int nr,
+			  bool canblock);
 
-int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr);
+static inline int lu_site_purge(const struct lu_env *env, struct lu_site *s,
+				int nr)
+{
+	return lu_site_purge_objects(env, s, nr, true);
+}
 
 void lu_site_print(const struct lu_env *env, struct lu_site *s, void *cookie,
 		   lu_printer_t printer);
@@ -1120,7 +1130,7 @@ struct lu_context_key {
 	{							 \
 		type *value;				      \
 								  \
-		CLASSERT(PAGE_SIZE >= sizeof(*value));        \
+		BUILD_BUG_ON(PAGE_SIZE < sizeof(*value));        \
 								  \
 		value = kzalloc(sizeof(*value), GFP_NOFS);	\
 		if (!value)				\
@@ -1326,5 +1336,8 @@ void lu_buf_realloc(struct lu_buf *buf, size_t size);
 int lu_buf_check_and_grow(struct lu_buf *buf, size_t len);
 struct lu_buf *lu_buf_check_and_alloc(struct lu_buf *buf, size_t len);
 
+extern __u32 lu_context_tags_default;
+extern __u32 lu_session_tags_default;
+
 /** @} lu */
 #endif /* __LUSTRE_LU_OBJECT_H */
diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
index 65ce503ad595..b0eb80d70c23 100644
--- a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
+++ b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h
@@ -3130,52 +3130,6 @@ struct obdo {
 #define o_cksum   o_nlink
 #define o_grant_used o_data_version
 
-static inline void lustre_set_wire_obdo(const struct obd_connect_data *ocd,
-					struct obdo *wobdo,
-					const struct obdo *lobdo)
-{
-	*wobdo = *lobdo;
-	wobdo->o_flags &= ~OBD_FL_LOCAL_MASK;
-	if (!ocd)
-		return;
-
-	if (unlikely(!(ocd->ocd_connect_flags & OBD_CONNECT_FID)) &&
-	    fid_seq_is_echo(ostid_seq(&lobdo->o_oi))) {
-		/* Currently OBD_FL_OSTID will only be used when 2.4 echo
-		 * client communicate with pre-2.4 server
-		 */
-		wobdo->o_oi.oi.oi_id = fid_oid(&lobdo->o_oi.oi_fid);
-		wobdo->o_oi.oi.oi_seq = fid_seq(&lobdo->o_oi.oi_fid);
-	}
-}
-
-static inline void lustre_get_wire_obdo(const struct obd_connect_data *ocd,
-					struct obdo *lobdo,
-					const struct obdo *wobdo)
-{
-	__u32 local_flags = 0;
-
-	if (lobdo->o_valid & OBD_MD_FLFLAGS)
-		local_flags = lobdo->o_flags & OBD_FL_LOCAL_MASK;
-
-	*lobdo = *wobdo;
-	if (local_flags != 0) {
-		lobdo->o_valid |= OBD_MD_FLFLAGS;
-		lobdo->o_flags &= ~OBD_FL_LOCAL_MASK;
-		lobdo->o_flags |= local_flags;
-	}
-	if (!ocd)
-		return;
-
-	if (unlikely(!(ocd->ocd_connect_flags & OBD_CONNECT_FID)) &&
-	    fid_seq_is_echo(wobdo->o_oi.oi.oi_seq)) {
-		/* see above */
-		lobdo->o_oi.oi_fid.f_seq = wobdo->o_oi.oi.oi_seq;
-		lobdo->o_oi.oi_fid.f_oid = wobdo->o_oi.oi.oi_id;
-		lobdo->o_oi.oi_fid.f_ver = 0;
-	}
-}
-
 /* request structure for OST's */
 struct ost_body {
 	struct  obdo oa;
diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_user.h b/drivers/staging/lustre/lustre/include/lustre/lustre_user.h
index 3301ad652db1..21aec0ca9ad3 100644
--- a/drivers/staging/lustre/lustre/include/lustre/lustre_user.h
+++ b/drivers/staging/lustre/lustre/include/lustre/lustre_user.h
@@ -1209,23 +1209,21 @@ struct hsm_action_item {
  * \retval buffer
  */
 static inline char *hai_dump_data_field(struct hsm_action_item *hai,
-					char *buffer, int len)
+					char *buffer, size_t len)
 {
-	int i, sz, data_len;
+	int i, data_len;
 	char *ptr;
 
 	ptr = buffer;
-	sz = len;
 	data_len = hai->hai_len - sizeof(*hai);
-	for (i = 0 ; (i < data_len) && (sz > 0) ; i++) {
-		int cnt;
-
-		cnt = snprintf(ptr, sz, "%.2X",
-			       (unsigned char)hai->hai_data[i]);
-		ptr += cnt;
-		sz -= cnt;
+	for (i = 0; (i < data_len) && (len > 2); i++) {
+		snprintf(ptr, 3, "%02X", (unsigned char)hai->hai_data[i]);
+		ptr += 2;
+		len -= 2;
 	}
+
 	*ptr = '\0';
+
 	return buffer;
 }
 
diff --git a/drivers/staging/lustre/lustre/include/lustre_net.h b/drivers/staging/lustre/lustre/include/lustre_net.h
index 411eb0dc7f38..1b48df0d4862 100644
--- a/drivers/staging/lustre/lustre/include/lustre_net.h
+++ b/drivers/staging/lustre/lustre/include/lustre_net.h
@@ -315,8 +315,8 @@ struct ptlrpc_client {
 union ptlrpc_async_args {
 	/**
 	 * Scratchpad for passing args to completion interpreter. Users
-	 * cast to the struct of their choosing, and CLASSERT that this is
-	 * big enough.  For _tons_ of context, kmalloc a struct and store
+	 * cast to the struct of their choosing, and BUILD_BUG_ON oversized
+	 * arguments.  For _tons_ of context, kmalloc a struct and store
 	 * a pointer to it here.  The pointer_arg ensures this struct is at
 	 * least big enough for that.
 	 */
@@ -1661,10 +1661,6 @@ struct ptlrpcd_ctl {
 	 */
 	char			pc_name[16];
 	/**
-	 * Environment for request interpreters to run in.
-	 */
-	struct lu_env	       pc_env;
-	/**
 	 * CPT the thread is bound on.
 	 */
 	int				pc_cpt;
diff --git a/drivers/staging/lustre/lustre/include/lustre_obdo.h b/drivers/staging/lustre/lustre/include/lustre_obdo.h
new file mode 100644
index 000000000000..1e12f8c0f157
--- /dev/null
+++ b/drivers/staging/lustre/lustre/include/lustre_obdo.h
@@ -0,0 +1,54 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2014, Intel Corporation.
+ *
+ * Copyright 2015 Cray Inc, all rights reserved.
+ * Author: Ben Evans.
+ *
+ * Define obdo associated functions
+ *   obdo:  OBject Device o...
+ */
+
+#ifndef _LUSTRE_OBDO_H_
+#define _LUSTRE_OBDO_H_
+
+#include "lustre/lustre_idl.h"
+
+/**
+ * Create an obdo to send over the wire
+ */
+void lustre_set_wire_obdo(const struct obd_connect_data *ocd,
+			  struct obdo *wobdo,
+			  const struct obdo *lobdo);
+
+/**
+ * Create a local obdo from a wire based odbo
+ */
+void lustre_get_wire_obdo(const struct obd_connect_data *ocd,
+			  struct obdo *lobdo,
+			  const struct obdo *wobdo);
+
+#endif
diff --git a/drivers/staging/lustre/lustre/include/lustre_req_layout.h b/drivers/staging/lustre/lustre/include/lustre_req_layout.h
index fbcd39572cd0..cd62ccd53e2c 100644
--- a/drivers/staging/lustre/lustre/include/lustre_req_layout.h
+++ b/drivers/staging/lustre/lustre/include/lustre_req_layout.h
@@ -39,6 +39,8 @@
 #ifndef _LUSTRE_REQ_LAYOUT_H__
 #define _LUSTRE_REQ_LAYOUT_H__
 
+#include <linux/types.h>
+
 /** \defgroup req_layout req_layout
  *
  * @{
@@ -66,11 +68,6 @@ struct req_capsule {
 	__u32		    rc_area[RCL_NR][REQ_MAX_FIELD_NR];
 };
 
-#if !defined(__REQ_LAYOUT_USER__)
-
-/* struct ptlrpc_request, lustre_msg* */
-#include "lustre_net.h"
-
 void req_capsule_init(struct req_capsule *pill, struct ptlrpc_request *req,
 		      enum req_location location);
 void req_capsule_fini(struct req_capsule *pill);
@@ -120,9 +117,6 @@ void req_capsule_shrink(struct req_capsule *pill,
 int  req_layout_init(void);
 void req_layout_fini(void);
 
-/* __REQ_LAYOUT_USER__ */
-#endif
-
 extern struct req_format RQF_OBD_PING;
 extern struct req_format RQF_OBD_SET_INFO;
 extern struct req_format RQF_SEC_CTX;
diff --git a/drivers/staging/lustre/lustre/include/obd.h b/drivers/staging/lustre/lustre/include/obd.h
index 0f48e9c3d9e3..4ce85064f9d0 100644
--- a/drivers/staging/lustre/lustre/include/obd.h
+++ b/drivers/staging/lustre/lustre/include/obd.h
@@ -43,6 +43,7 @@
 #include "lustre_fld.h"
 #include "lustre_handles.h"
 #include "lustre_intent.h"
+#include "cl_object.h"
 
 #define MAX_OBD_DEVICES 8192
 
@@ -76,6 +77,8 @@ static inline void loi_init(struct lov_oinfo *loi)
 struct lov_stripe_md;
 struct obd_info;
 
+int lov_read_and_clear_async_rc(struct cl_object *clob);
+
 typedef int (*obd_enqueue_update_f)(void *cookie, int rc);
 
 /* obd info for a particular level (lov, osc). */
@@ -284,6 +287,8 @@ struct client_obd {
 	 * the transaction has NOT yet committed.
 	 */
 	atomic_long_t		 cl_unstable_count;
+	/** Link to osc_shrinker_list */
+	struct list_head	 cl_shrink_list;
 
 	/* number of in flight destroy rpcs is limited to max_rpcs_in_flight */
 	atomic_t	     cl_destroy_in_flight;
@@ -398,18 +403,10 @@ struct lmv_tgt_desc {
 	unsigned long		ltd_active:1; /* target up for requests */
 };
 
-enum placement_policy {
-	PLACEMENT_CHAR_POLICY   = 0,
-	PLACEMENT_NID_POLICY    = 1,
-	PLACEMENT_INVAL_POLICY  = 2,
-	PLACEMENT_MAX_POLICY
-};
-
 struct lmv_obd {
 	int			refcount;
 	struct lu_client_fld	lmv_fld;
 	spinlock_t		lmv_lock;
-	enum placement_policy	lmv_placement;
 	struct lmv_desc		desc;
 	struct obd_uuid		cluuid;
 	struct obd_export	*exp;
@@ -478,16 +475,12 @@ struct niobuf_local {
  * Events signalled through obd_notify() upcall-chain.
  */
 enum obd_notify_event {
-	/* target added */
-	OBD_NOTIFY_CREATE,
 	/* Device connect start */
 	OBD_NOTIFY_CONNECT,
 	/* Device activated */
 	OBD_NOTIFY_ACTIVE,
 	/* Device deactivated */
 	OBD_NOTIFY_INACTIVE,
-	/* Device disconnected */
-	OBD_NOTIFY_DISCON,
 	/* Connect data for import were changed */
 	OBD_NOTIFY_OCD,
 	/* Sync request */
@@ -758,6 +751,7 @@ struct md_enqueue_info {
 	struct lookup_intent    mi_it;
 	struct lustre_handle    mi_lockh;
 	struct inode	   *mi_dir;
+	struct ldlm_enqueue_info	mi_einfo;
 	int (*mi_cb)(struct ptlrpc_request *req,
 		     struct md_enqueue_info *minfo, int rc);
 	void			*mi_cbdata;
@@ -889,7 +883,7 @@ struct obd_client_handle {
 	struct md_open_data	*och_mod;
 	struct lustre_handle	 och_lease_handle; /* open lock for lease */
 	__u32			 och_magic;
-	int			 och_flags;
+	fmode_t			 och_flags;
 };
 
 #define OBD_CLIENT_HANDLE_MAGIC 0xd15ea5ed
@@ -975,8 +969,7 @@ struct md_ops {
 				struct lu_fid *fid);
 
 	int (*intent_getattr_async)(struct obd_export *,
-				    struct md_enqueue_info *,
-				    struct ldlm_enqueue_info *);
+				    struct md_enqueue_info *);
 
 	int (*revalidate_lock)(struct obd_export *, struct lookup_intent *,
 			       struct lu_fid *, __u64 *bits);
diff --git a/drivers/staging/lustre/lustre/include/obd_class.h b/drivers/staging/lustre/lustre/include/obd_class.h
index 7ec25202cd22..083a6ff56a05 100644
--- a/drivers/staging/lustre/lustre/include/obd_class.h
+++ b/drivers/staging/lustre/lustre/include/obd_class.h
@@ -1444,14 +1444,13 @@ static inline int md_init_ea_size(struct obd_export *exp, u32 easize,
 }
 
 static inline int md_intent_getattr_async(struct obd_export *exp,
-					  struct md_enqueue_info *minfo,
-					  struct ldlm_enqueue_info *einfo)
+					  struct md_enqueue_info *minfo)
 {
 	int rc;
 
 	EXP_CHECK_MD_OP(exp, intent_getattr_async);
 	EXP_MD_COUNTER_INCREMENT(exp, intent_getattr_async);
-	rc = MDP(exp->exp_obd, intent_getattr_async)(exp, minfo, einfo);
+	rc = MDP(exp->exp_obd, intent_getattr_async)(exp, minfo);
 	return rc;
 }
 
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_extent.c b/drivers/staging/lustre/lustre/ldlm/ldlm_extent.c
index 32b73ee62639..08f97e2117ed 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_extent.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_extent.c
@@ -162,7 +162,7 @@ void ldlm_extent_add_lock(struct ldlm_resource *res,
 	struct interval_node *found, **root;
 	struct ldlm_interval *node;
 	struct ldlm_extent *extent;
-	int idx;
+	int idx, rc;
 
 	LASSERT(lock->l_granted_mode == lock->l_req_mode);
 
@@ -176,7 +176,8 @@ void ldlm_extent_add_lock(struct ldlm_resource *res,
 
 	/* node extent initialize */
 	extent = &lock->l_policy_data.l_extent;
-	interval_set(&node->li_node, extent->start, extent->end);
+	rc = interval_set(&node->li_node, extent->start, extent->end);
+	LASSERT(!rc);
 
 	root = &res->lr_itree[idx].lit_root;
 	found = interval_insert(&node->li_node, root);
@@ -243,7 +244,6 @@ void ldlm_extent_unlink_lock(struct ldlm_lock *lock)
 void ldlm_extent_policy_wire_to_local(const union ldlm_wire_policy_data *wpolicy,
 				      union ldlm_policy_data *lpolicy)
 {
-	memset(lpolicy, 0, sizeof(*lpolicy));
 	lpolicy->l_extent.start = wpolicy->l_extent.start;
 	lpolicy->l_extent.end = wpolicy->l_extent.end;
 	lpolicy->l_extent.gid = wpolicy->l_extent.gid;
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c b/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c
index 722160784f83..b7f28b39c7b3 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_flock.c
@@ -143,7 +143,7 @@ static int ldlm_process_flock_lock(struct ldlm_lock *req, __u64 *flags,
 	int added = (mode == LCK_NL);
 	int overlaps = 0;
 	int splitted = 0;
-	const struct ldlm_callback_suite null_cbs = { NULL };
+	const struct ldlm_callback_suite null_cbs = { };
 
 	CDEBUG(D_DLMTRACE,
 	       "flags %#llx owner %llu pid %u mode %u start %llu end %llu\n",
@@ -615,7 +615,6 @@ EXPORT_SYMBOL(ldlm_flock_completion_ast);
 void ldlm_flock_policy_wire_to_local(const union ldlm_wire_policy_data *wpolicy,
 				     union ldlm_policy_data *lpolicy)
 {
-	memset(lpolicy, 0, sizeof(*lpolicy));
 	lpolicy->l_flock.start = wpolicy->l_flock.lfw_start;
 	lpolicy->l_flock.end = wpolicy->l_flock.lfw_end;
 	lpolicy->l_flock.pid = wpolicy->l_flock.lfw_pid;
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_inodebits.c b/drivers/staging/lustre/lustre/ldlm/ldlm_inodebits.c
index 8e1709dc073c..ae37c3686b1b 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_inodebits.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_inodebits.c
@@ -57,7 +57,6 @@
 void ldlm_ibits_policy_wire_to_local(const union ldlm_wire_policy_data *wpolicy,
 				     union ldlm_policy_data *lpolicy)
 {
-	memset(lpolicy, 0, sizeof(*lpolicy));
 	lpolicy->l_inodebits.bits = wpolicy->l_inodebits.bits;
 }
 
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
index 9be01426c955..3663c5cdb051 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lib.c
@@ -336,6 +336,7 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 	INIT_LIST_HEAD(&cli->cl_lru_list);
 	spin_lock_init(&cli->cl_lru_list_lock);
 	atomic_long_set(&cli->cl_unstable_count, 0);
+	INIT_LIST_HEAD(&cli->cl_shrink_list);
 
 	init_waitqueue_head(&cli->cl_destroy_waitq);
 	atomic_set(&cli->cl_destroy_in_flight, 0);
@@ -350,13 +351,11 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 	cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 	atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 
-	/* This value may be reduced at connect time in
-	 * ptlrpc_connect_interpret() . We initialize it to only
-	 * 1MB until we know what the performance looks like.
-	 * In the future this should likely be increased. LU-1431
+	/*
+	 * Set it to possible maximum size. It may be reduced by ocd_brw_size
+	 * from OFD after connecting.
 	 */
-	cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
-					  LNET_MTU >> PAGE_SHIFT);
+	cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 
 	/*
 	 * set cl_chunkbits default value to PAGE_CACHE_SHIFT,
@@ -524,6 +523,8 @@ int client_connect_import(const struct lu_env *env,
 
 	rc = ptlrpc_connect_import(imp);
 	if (rc != 0) {
+		if (data && is_mdc)
+			data->ocd_connect_flags &= ~OBD_CONNECT_MULTIMODRPCS;
 		LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 		goto out_ldlm;
 	}
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
index a4a291acb659..5a94265fe60b 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
@@ -533,6 +533,13 @@ struct ldlm_lock *__ldlm_handle2lock(const struct lustre_handle *handle,
 	if (!lock)
 		return NULL;
 
+	if (lock->l_export && lock->l_export->exp_failed) {
+		CDEBUG(D_INFO, "lock export failed: lock %p, exp %p\n",
+		       lock, lock->l_export);
+		LDLM_LOCK_PUT(lock);
+		return NULL;
+	}
+
 	/* It's unlikely but possible that someone marked the lock as
 	 * destroyed after we did handle2object on it
 	 */
@@ -1131,8 +1138,7 @@ static int lock_matches(struct ldlm_lock *lock, struct lock_match_data *data)
 	if (!data->lmd_unref && LDLM_HAVE_MASK(lock, GONE))
 		return INTERVAL_ITER_CONT;
 
-	if ((data->lmd_flags & LDLM_FL_LOCAL_ONLY) &&
-	    !ldlm_is_local(lock))
+	if (!equi(data->lmd_flags & LDLM_FL_LOCAL_ONLY, ldlm_is_local(lock)))
 		return INTERVAL_ITER_CONT;
 
 	if (data->lmd_flags & LDLM_FL_TEST_LOCK) {
@@ -1148,7 +1154,7 @@ static int lock_matches(struct ldlm_lock *lock, struct lock_match_data *data)
 	return INTERVAL_ITER_STOP;
 }
 
-static unsigned int itree_overlap_cb(struct interval_node *in, void *args)
+static enum interval_iter itree_overlap_cb(struct interval_node *in, void *args)
 {
 	struct ldlm_interval *node = to_ldlm_interval(in);
 	struct lock_match_data *data = args;
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
index c1f8693f94a5..ebfda368b057 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
@@ -1972,7 +1972,7 @@ static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock)
 	LDLM_DEBUG(lock, "replaying lock:");
 
 	atomic_inc(&req->rq_import->imp_replay_inflight);
-	CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*aa) > sizeof(req->rq_async_args));
 	aa = ptlrpc_req_async_args(req);
 	aa->lock_handle = body->lock_handle[0];
 	req->rq_interpret_reply = (ptlrpc_interpterer_t)replay_lock_interpret;
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c b/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c
index b22f5bae7201..d16f5e95ef0b 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_resource.c
@@ -1368,7 +1368,7 @@ void ldlm_resource_dump(int level, struct ldlm_resource *res)
 	struct ldlm_lock *lock;
 	unsigned int granted = 0;
 
-	CLASSERT(RES_NAME_SIZE == 4);
+	BUILD_BUG_ON(RES_NAME_SIZE != 4);
 
 	if (!((libcfs_debug | D_ERROR) & level))
 		return;
diff --git a/drivers/staging/lustre/lustre/llite/dcache.c b/drivers/staging/lustre/lustre/llite/dcache.c
index 65bf0c401b44..966f580e26fb 100644
--- a/drivers/staging/lustre/lustre/llite/dcache.c
+++ b/drivers/staging/lustre/lustre/llite/dcache.c
@@ -247,17 +247,14 @@ static int ll_revalidate_dentry(struct dentry *dentry,
 		return 1;
 
 	/*
-	 * if open&create is set, talk to MDS to make sure file is created if
-	 * necessary, because we can't do this in ->open() later since that's
-	 * called on an inode. return 0 here to let lookup to handle this.
+	 * VFS warns us that this is the second go around and previous
+	 * operation failed (most likely open|creat), so this time
+	 * we better talk to the server via the lookup path by name,
+	 * not by fid.
 	 */
-	if ((lookup_flags & (LOOKUP_OPEN | LOOKUP_CREATE)) ==
-	    (LOOKUP_OPEN | LOOKUP_CREATE))
+	if (lookup_flags & LOOKUP_REVAL)
 		return 0;
 
-	if (lookup_flags & (LOOKUP_PARENT | LOOKUP_OPEN | LOOKUP_CREATE))
-		return 1;
-
 	if (!dentry_may_statahead(dir, dentry))
 		return 1;
 
diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index ea5d247a3f70..13b35922a4ca 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -432,7 +432,7 @@ static int ll_dir_setdirstripe(struct inode *parent, struct lmv_user_md *lump,
 
 	if (!IS_POSIXACL(parent) || !exp_connect_umask(ll_i2mdexp(parent)))
 		mode &= ~current_umask();
-	mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
+	mode = (mode & (0777 | S_ISVTX)) | S_IFDIR;
 	op_data = ll_prep_md_op_data(NULL, parent, NULL, dirname,
 				     strlen(dirname), mode, LUSTRE_OPC_MKDIR,
 				     lump);
@@ -521,12 +521,15 @@ int ll_dir_setstripe(struct inode *inode, struct lov_user_md *lump,
 	rc = md_setattr(sbi->ll_md_exp, op_data, lump, lum_size, &req);
 	ll_finish_md_op_data(op_data);
 	ptlrpc_req_finished(req);
-	if (rc) {
-		if (rc != -EPERM && rc != -EACCES)
-			CERROR("mdc_setattr fails: rc = %d\n", rc);
-	}
+	if (rc)
+		return rc;
 
-	/* In the following we use the fact that LOV_USER_MAGIC_V1 and
+#if OBD_OCD_VERSION(2, 13, 53, 0) > LUSTRE_VERSION_CODE
+	/*
+	 * 2.9 server has stored filesystem default stripe in ROOT xattr,
+	 * and it's stored into system config for backward compatibility.
+	 *
+	 * In the following we use the fact that LOV_USER_MAGIC_V1 and
 	 * LOV_USER_MAGIC_V3 have the same initial fields so we do not
 	 * need to make the distinction between the 2 versions
 	 */
@@ -567,6 +570,7 @@ int ll_dir_setstripe(struct inode *inode, struct lov_user_md *lump,
 end:
 		kfree(param);
 	}
+#endif
 	return rc;
 }
 
diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index f634c11216e6..10adfcdd7035 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -122,26 +122,25 @@ static int ll_close_inode_openhandle(struct obd_export *md_exp,
 				     enum mds_op_bias bias,
 				     void *data)
 {
-	struct obd_export *exp = ll_i2mdexp(inode);
+	const struct ll_inode_info *lli = ll_i2info(inode);
 	struct md_op_data *op_data;
 	struct ptlrpc_request *req = NULL;
-	struct obd_device *obd = class_exp2obd(exp);
 	int rc;
 
-	if (!obd) {
-		/*
-		 * XXX: in case of LMV, is this correct to access
-		 * ->exp_handle?
-		 */
-		CERROR("Invalid MDC connection handle %#llx\n",
-		       ll_i2mdexp(inode)->exp_handle.h_cookie);
+	if (!class_exp2obd(md_exp)) {
+		CERROR("%s: invalid MDC connection handle closing " DFID "\n",
+		       ll_get_fsname(inode->i_sb, NULL, 0),
+		       PFID(&lli->lli_fid));
 		rc = 0;
 		goto out;
 	}
 
 	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	/*
+	 * We leak openhandle and request here on error, but not much to be
+	 * done in OOM case since app won't retry close on error either.
+	 */
 	if (!op_data) {
-		/* XXX We leak openhandle and request here. */
 		rc = -ENOMEM;
 		goto out;
 	}
@@ -170,10 +169,9 @@ static int ll_close_inode_openhandle(struct obd_export *md_exp,
 	}
 
 	rc = md_close(md_exp, op_data, och->och_mod, &req);
-	if (rc) {
-		CERROR("%s: inode "DFID" mdc close failed: rc = %d\n",
-		       ll_i2mdexp(inode)->exp_obd->obd_name,
-		       PFID(ll_inode2fid(inode)), rc);
+	if (rc && rc != -EINTR) {
+		CERROR("%s: inode " DFID " mdc close failed: rc = %d\n",
+		       md_exp->exp_obd->obd_name, PFID(&lli->lli_fid), rc);
 	}
 
 	if (op_data->op_bias & (MDS_HSM_RELEASE | MDS_CLOSE_LAYOUT_SWAP) &&
@@ -192,8 +190,7 @@ out:
 	och->och_fh.cookie = DEAD_HANDLE_MAGIC;
 	kfree(och);
 
-	if (req) /* This is close request */
-		ptlrpc_req_finished(req);
+	ptlrpc_req_finished(req);
 	return rc;
 }
 
@@ -420,6 +417,17 @@ out:
 	ptlrpc_req_finished(req);
 	ll_intent_drop_lock(itp);
 
+	/*
+	 * We did open by fid, but by the time we got to the server,
+	 * the object disappeared. If this is a create, we cannot really
+	 * tell the userspace that the file it was trying to create
+	 * does not exist. Instead let's return -ESTALE, and the VFS will
+	 * retry the create with LOOKUP_REVAL that we are going to catch
+	 * in ll_revalidate_dentry() and use lookup then.
+	 */
+	if (rc == -ENOENT && itp->it_op & IT_CREAT)
+		rc = -ESTALE;
+
 	return rc;
 }
 
@@ -1016,7 +1024,7 @@ static bool file_is_noatime(const struct file *file)
 	return false;
 }
 
-void ll_io_init(struct cl_io *io, const struct file *file, int write)
+static void ll_io_init(struct cl_io *io, const struct file *file, int write)
 {
 	struct inode *inode = file_inode(file);
 
@@ -1821,7 +1829,7 @@ free:
 	return rc;
 }
 
-static int ll_hsm_state_set(struct inode *inode, struct hsm_state_set *hss)
+int ll_hsm_state_set(struct inode *inode, struct hsm_state_set *hss)
 {
 	struct md_op_data	*op_data;
 	int			 rc;
@@ -1883,7 +1891,7 @@ static int ll_hsm_import(struct inode *inode, struct file *file,
 		goto free_hss;
 	}
 
-	attr->ia_mode = hui->hui_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
+	attr->ia_mode = hui->hui_mode & 0777;
 	attr->ia_mode |= S_IFREG;
 	attr->ia_uid = make_kuid(&init_user_ns, hui->hui_uid);
 	attr->ia_gid = make_kgid(&init_user_ns, hui->hui_gid);
@@ -2618,18 +2626,18 @@ int ll_migrate(struct inode *parent, struct file *file, int mdtidx,
 		       ll_get_fsname(parent->i_sb, NULL, 0), name,
 		       PFID(&op_data->op_fid3));
 		rc = -EINVAL;
-		goto out_free;
+		goto out_unlock;
 	}
 
 	rc = ll_get_mdt_idx_by_fid(ll_i2sbi(parent), &op_data->op_fid3);
 	if (rc < 0)
-		goto out_free;
+		goto out_unlock;
 
 	if (rc == mdtidx) {
 		CDEBUG(D_INFO, "%s:"DFID" is already on MDT%d.\n", name,
 		       PFID(&op_data->op_fid3), mdtidx);
 		rc = 0;
-		goto out_free;
+		goto out_unlock;
 	}
 again:
 	if (S_ISREG(child_inode->i_mode)) {
@@ -2637,13 +2645,13 @@ again:
 		if (IS_ERR(och)) {
 			rc = PTR_ERR(och);
 			och = NULL;
-			goto out_free;
+			goto out_unlock;
 		}
 
 		rc = ll_data_version(child_inode, &data_version,
 				     LL_DV_WR_FLUSH);
 		if (rc)
-			goto out_free;
+			goto out_close;
 
 		op_data->op_handle = och->och_fh;
 		op_data->op_data = och->och_mod;
@@ -2656,40 +2664,45 @@ again:
 	op_data->op_cli_flags = CLI_MIGRATE;
 	rc = md_rename(ll_i2sbi(parent)->ll_md_exp, op_data, name,
 		       namelen, name, namelen, &request);
-	if (!rc)
+	if (!rc) {
+		LASSERT(request);
 		ll_update_times(request, parent);
 
-	body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
-	if (!body) {
-		rc = -EPROTO;
-		goto out_free;
+		body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
+		LASSERT(body);
+
+		/*
+		 * If the server does release layout lock, then we cleanup
+		 * the client och here, otherwise release it in out_close:
+		 */
+		if (och && body->mbo_valid & OBD_MD_CLOSE_INTENT_EXECED) {
+			obd_mod_put(och->och_mod);
+			md_clear_open_replay_data(ll_i2sbi(parent)->ll_md_exp,
+						  och);
+			och->och_fh.cookie = DEAD_HANDLE_MAGIC;
+			kfree(och);
+			och = NULL;
+		}
 	}
 
-	/*
-	 * If the server does release layout lock, then we cleanup
-	 * the client och here, otherwise release it in out_free:
-	 */
-	if (och && body->mbo_valid & OBD_MD_CLOSE_INTENT_EXECED) {
-		obd_mod_put(och->och_mod);
-		md_clear_open_replay_data(ll_i2sbi(parent)->ll_md_exp, och);
-		och->och_fh.cookie = DEAD_HANDLE_MAGIC;
-		kfree(och);
-		och = NULL;
+	if (request) {
+		ptlrpc_req_finished(request);
+		request = NULL;
 	}
 
-	ptlrpc_req_finished(request);
 	/* Try again if the file layout has changed. */
 	if (rc == -EAGAIN && S_ISREG(child_inode->i_mode))
 		goto again;
-out_free:
-	if (child_inode) {
-		if (och) /* close the file */
-			ll_lease_close(och, child_inode, NULL);
-		clear_nlink(child_inode);
-		inode_unlock(child_inode);
-		iput(child_inode);
-	}
 
+out_close:
+	if (och) /* close the file */
+		ll_lease_close(och, child_inode, NULL);
+	if (!rc)
+		clear_nlink(child_inode);
+out_unlock:
+	inode_unlock(child_inode);
+	iput(child_inode);
+out_free:
 	ll_finish_md_op_data(op_data);
 	return rc;
 }
diff --git a/drivers/staging/lustre/lustre/llite/lcommon_cl.c b/drivers/staging/lustre/lustre/llite/lcommon_cl.c
index dd1cfd8f5213..f1036f477a51 100644
--- a/drivers/staging/lustre/lustre/llite/lcommon_cl.c
+++ b/drivers/staging/lustre/lustre/llite/lcommon_cl.c
@@ -94,6 +94,7 @@ int cl_setattr_ost(struct cl_object *obj, const struct iattr *attr,
 
 	io = vvp_env_thread_io(env);
 	io->ci_obj = obj;
+	io->ci_verify_layout = 1;
 
 	io->u.ci_setattr.sa_attr.lvb_atime = LTIME_S(attr->ia_atime);
 	io->u.ci_setattr.sa_attr.lvb_mtime = LTIME_S(attr->ia_mtime);
@@ -120,13 +121,7 @@ again:
 	cl_io_fini(env, io);
 	if (unlikely(io->ci_need_restart))
 		goto again;
-	/* HSM import case: file is released, cannot be restored
-	 * no need to fail except if restore registration failed
-	 * with -ENODATA
-	 */
-	if (result == -ENODATA && io->ci_restore_needed &&
-	    io->ci_result != -ENODATA)
-		result = 0;
+
 	cl_env_put(env, &refcheck);
 	return result;
 }
diff --git a/drivers/staging/lustre/lustre/llite/lcommon_misc.c b/drivers/staging/lustre/lustre/llite/lcommon_misc.c
index f48660ed350f..f0c132e2cf92 100644
--- a/drivers/staging/lustre/lustre/llite/lcommon_misc.c
+++ b/drivers/staging/lustre/lustre/llite/lcommon_misc.c
@@ -33,6 +33,7 @@
  * future).
  *
  */
+#define DEBUG_SUBSYSTEM S_LLITE
 #include "../include/obd_class.h"
 #include "../include/obd_support.h"
 #include "../include/obd.h"
@@ -132,7 +133,6 @@ int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
 
 	io = vvp_env_thread_io(env);
 	io->ci_obj = obj;
-	io->ci_ignore_layout = 1;
 
 	rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
 	if (rc != 0) {
diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
index 065a9a7e120a..ecdfd0c29b7f 100644
--- a/drivers/staging/lustre/lustre/llite/llite_internal.h
+++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
@@ -281,10 +281,8 @@ static inline struct ll_inode_info *ll_i2info(struct inode *inode)
 	return container_of(inode, struct ll_inode_info, lli_vfs_inode);
 }
 
-/* default to about 40meg of readahead on a given system.  That much tied
- * up in 512k readahead requests serviced at 40ms each is about 1GB/s.
- */
-#define SBI_DEFAULT_READAHEAD_MAX (40UL << (20 - PAGE_SHIFT))
+/* default to about 64M of readahead on a given system. */
+#define SBI_DEFAULT_READAHEAD_MAX	(64UL << (20 - PAGE_SHIFT))
 
 /* default to read-ahead full files smaller than 2MB on the second read */
 #define SBI_DEFAULT_READAHEAD_WHOLE_MAX (2UL << (20 - PAGE_SHIFT))
@@ -321,6 +319,9 @@ struct ll_ra_info {
 struct ra_io_arg {
 	unsigned long ria_start;  /* start offset of read-ahead*/
 	unsigned long ria_end;    /* end offset of read-ahead*/
+	unsigned long ria_reserved; /* reserved pages for read-ahead */
+	unsigned long ria_end_min;  /* minimum end to cover current read */
+	bool ria_eof;		    /* reach end of file */
 	/* If stride read pattern is detected, ria_stoff means where
 	 * stride read is started. Note: for normal read-ahead, the
 	 * value here is meaningless, and also it will not be accessed
@@ -505,6 +506,7 @@ struct ll_sb_info {
 						 */
 	/* root squash */
 	struct root_squash_info	  ll_squash;
+	struct path		 ll_mnt;
 
 	__kernel_fsid_t		  ll_fsid;
 	struct kobject		 ll_kobj; /* sysfs object */
@@ -551,6 +553,11 @@ struct ll_readahead_state {
 	 */
 	unsigned long   ras_window_start, ras_window_len;
 	/*
+	 * Optimal RPC size. It decides how many pages will be sent
+	 * for each read-ahead.
+	 */
+	unsigned long	ras_rpc_size;
+	/*
 	 * Where next read-ahead should start at. This lies within read-ahead
 	 * window. Read-ahead window is read in pieces rather than at once
 	 * because: 1. lustre limits total number of pages under read-ahead by
@@ -766,6 +773,7 @@ int ll_merge_attr(const struct lu_env *env, struct inode *inode);
 int ll_fid2path(struct inode *inode, void __user *arg);
 int ll_data_version(struct inode *inode, __u64 *data_version, int flags);
 int ll_hsm_release(struct inode *inode);
+int ll_hsm_state_set(struct inode *inode, struct hsm_state_set *hss);
 
 /* llite/dcache.c */
 
diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
index 25f5aed97f63..b229cbc7bb33 100644
--- a/drivers/staging/lustre/lustre/llite/llite_lib.c
+++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
@@ -103,6 +103,7 @@ static struct ll_sb_info *ll_init_sbi(struct super_block *sb)
 	sbi->ll_flags |= LL_SBI_CHECKSUM;
 
 	sbi->ll_flags |= LL_SBI_LRU_RESIZE;
+	sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 
 	for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
 		spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
@@ -303,6 +304,7 @@ static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
 	sb->s_magic = LL_SUPER_MAGIC;
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sbi->ll_namelen = osfs->os_namelen;
+	sbi->ll_mnt.mnt = current->fs->root.mnt;
 
 	if ((sbi->ll_flags & LL_SBI_USER_XATTR) &&
 	    !(data->ocd_connect_flags & OBD_CONNECT_XATTR)) {
@@ -1402,7 +1404,11 @@ static int ll_md_setattr(struct dentry *dentry, struct md_op_data *op_data)
 	 * cache is not cleared yet.
 	 */
 	op_data->op_attr.ia_valid &= ~(TIMES_SET_FLAGS | ATTR_SIZE);
+	if (S_ISREG(inode->i_mode))
+		inode_lock(inode);
 	rc = simple_setattr(dentry, &op_data->op_attr);
+	if (S_ISREG(inode->i_mode))
+		inode_unlock(inode);
 	op_data->op_attr.ia_valid = ia_valid;
 
 	rc = ll_update_inode(inode, &md);
@@ -1431,7 +1437,6 @@ int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import)
 	struct inode *inode = d_inode(dentry);
 	struct ll_inode_info *lli = ll_i2info(inode);
 	struct md_op_data *op_data = NULL;
-	bool file_is_released = false;
 	int rc = 0;
 
 	CDEBUG(D_VFSTRACE, "%s: setattr inode "DFID"(%p) from %llu to %llu, valid %x, hsm_import %d\n",
@@ -1486,76 +1491,35 @@ int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import)
 		       LTIME_S(attr->ia_mtime), LTIME_S(attr->ia_ctime),
 		       (s64)ktime_get_real_seconds());
 
-	/* We always do an MDS RPC, even if we're only changing the size;
-	 * only the MDS knows whether truncate() should fail with -ETXTBUSY
-	 */
-
-	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
-	if (!op_data)
-		return -ENOMEM;
-
-	if (!S_ISDIR(inode->i_mode))
+	if (S_ISREG(inode->i_mode))
 		inode_unlock(inode);
 
-	/* truncate on a released file must failed with -ENODATA,
-	 * so size must not be set on MDS for released file
-	 * but other attributes must be set
+	/*
+	 * We always do an MDS RPC, even if we're only changing the size;
+	 * only the MDS knows whether truncate() should fail with -ETXTBUSY
 	 */
-	if (S_ISREG(inode->i_mode)) {
-		struct cl_layout cl = {
-			.cl_is_released = false,
-		};
-		struct lu_env *env;
-		int refcheck;
-		__u32 gen;
+	op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
+	if (!op_data) {
+		rc = -ENOMEM;
+		goto out;
+	}
 
-		rc = ll_layout_refresh(inode, &gen);
-		if (rc < 0)
-			goto out;
+	op_data->op_attr = *attr;
 
+	if (!hsm_import && attr->ia_valid & ATTR_SIZE) {
 		/*
-		 * XXX: the only place we need to know the layout type,
-		 * this will be removed by a later patch. -Jinshan
+		 * If we are changing file size, file content is
+		 * modified, flag it.
 		 */
-		env = cl_env_get(&refcheck);
-		if (IS_ERR(env)) {
-			rc = PTR_ERR(env);
-			goto out;
-		}
-
-		rc = cl_object_layout_get(env, lli->lli_clob, &cl);
-		cl_env_put(env, &refcheck);
-		if (rc < 0)
-			goto out;
-
-		file_is_released = cl.cl_is_released;
-
-		if (!hsm_import && attr->ia_valid & ATTR_SIZE) {
-			if (file_is_released) {
-				rc = ll_layout_restore(inode, 0, attr->ia_size);
-				if (rc < 0)
-					goto out;
-
-				file_is_released = false;
-				ll_layout_refresh(inode, &gen);
-			}
-
-			/*
-			 * If we are changing file size, file content is
-			 * modified, flag it.
-			 */
-			attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
-			op_data->op_bias |= MDS_DATA_MODIFIED;
-		}
+		attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
+		op_data->op_bias |= MDS_DATA_MODIFIED;
 	}
 
-	memcpy(&op_data->op_attr, attr, sizeof(*attr));
-
 	rc = ll_md_setattr(dentry, op_data);
 	if (rc)
 		goto out;
 
-	if (!S_ISREG(inode->i_mode) || file_is_released) {
+	if (!S_ISREG(inode->i_mode) || hsm_import) {
 		rc = 0;
 		goto out;
 	}
@@ -1572,11 +1536,40 @@ int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import)
 		 */
 		rc = cl_setattr_ost(ll_i2info(inode)->lli_clob, attr, 0);
 	}
+
+	/*
+	 * If the file was restored, it needs to set dirty flag.
+	 *
+	 * We've already sent MDS_DATA_MODIFIED flag in
+	 * ll_md_setattr() for truncate. However, the MDT refuses to
+	 * set the HS_DIRTY flag on released files, so we have to set
+	 * it again if the file has been restored. Please check how
+	 * LLIF_DATA_MODIFIED is set in vvp_io_setattr_fini().
+	 *
+	 * Please notice that if the file is not released, the previous
+	 * MDS_DATA_MODIFIED has taken effect and usually
+	 * LLIF_DATA_MODIFIED is not set(see vvp_io_setattr_fini()).
+	 * This way we can save an RPC for common open + trunc
+	 * operation.
+	 */
+	if (test_and_clear_bit(LLIF_DATA_MODIFIED, &lli->lli_flags)) {
+		struct hsm_state_set hss = {
+			.hss_valid = HSS_SETMASK,
+			.hss_setmask = HS_DIRTY,
+		};
+		int rc2;
+
+		rc2 = ll_hsm_state_set(inode, &hss);
+		if (rc2 < 0)
+			CERROR(DFID "HSM set dirty failed: rc2 = %d\n",
+			       PFID(ll_inode2fid(inode)), rc2);
+	}
+
 out:
 	if (op_data)
 		ll_finish_md_op_data(op_data);
 
-	if (!S_ISDIR(inode->i_mode)) {
+	if (S_ISREG(inode->i_mode)) {
 		inode_lock(inode);
 		if ((attr->ia_valid & ATTR_SIZE) && !hsm_import)
 			inode_dio_wait(inode);
@@ -1599,7 +1592,7 @@ int ll_setattr(struct dentry *de, struct iattr *attr)
 	if (((attr->ia_valid & (ATTR_MODE | ATTR_FORCE | ATTR_SIZE)) ==
 			       (ATTR_SIZE | ATTR_MODE)) &&
 	    (((mode & S_ISUID) && !(attr->ia_mode & S_ISUID)) ||
-	     (((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) &&
+	     (((mode & (S_ISGID | 0010)) == (S_ISGID | 0010)) &&
 	      !(attr->ia_mode & S_ISGID))))
 		attr->ia_valid |= ATTR_FORCE;
 
@@ -1610,7 +1603,7 @@ int ll_setattr(struct dentry *de, struct iattr *attr)
 		attr->ia_valid |= ATTR_KILL_SUID;
 
 	if ((attr->ia_valid & ATTR_MODE) &&
-	    ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) &&
+	    ((mode & (S_ISGID | 0010)) == (S_ISGID | 0010)) &&
 	    !(attr->ia_mode & S_ISGID) &&
 	    !(attr->ia_valid & ATTR_KILL_SGID))
 		attr->ia_valid |= ATTR_KILL_SGID;
@@ -1998,6 +1991,8 @@ void ll_umount_begin(struct super_block *sb)
 	struct ll_sb_info *sbi = ll_s2sbi(sb);
 	struct obd_device *obd;
 	struct obd_ioctl_data *ioc_data;
+	wait_queue_head_t waitq;
+	struct l_wait_info lwi;
 
 	CDEBUG(D_VFSTRACE, "VFS Op: superblock %p count %d active %d\n", sb,
 	       sb->s_count, atomic_read(&sb->s_active));
@@ -2030,9 +2025,14 @@ void ll_umount_begin(struct super_block *sb)
 	}
 
 	/* Really, we'd like to wait until there are no requests outstanding,
-	 * and then continue.  For now, we just invalidate the requests,
-	 * schedule() and sleep one second if needed, and hope.
+	 * and then continue. For now, we just periodically checking for vfs
+	 * to decrement mnt_cnt and hope to finish it within 10sec.
 	 */
+	init_waitqueue_head(&waitq);
+	lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(10),
+				   cfs_time_seconds(1), NULL, NULL);
+	l_wait_event(waitq, may_umount(sbi->ll_mnt.mnt), &lwi);
+
 	schedule();
 }
 
diff --git a/drivers/staging/lustre/lustre/llite/lproc_llite.c b/drivers/staging/lustre/lustre/llite/lproc_llite.c
index 03682c10fc9e..f3ee584157e0 100644
--- a/drivers/staging/lustre/lustre/llite/lproc_llite.c
+++ b/drivers/staging/lustre/lustre/llite/lproc_llite.c
@@ -924,27 +924,29 @@ static ssize_t ll_unstable_stats_seq_write(struct file *file,
 }
 LPROC_SEQ_FOPS(ll_unstable_stats);
 
-static ssize_t root_squash_show(struct kobject *kobj, struct attribute *attr,
-				char *buf)
+static int ll_root_squash_seq_show(struct seq_file *m, void *v)
 {
-	struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
-					      ll_kobj);
+	struct super_block *sb = m->private;
+	struct ll_sb_info *sbi = ll_s2sbi(sb);
 	struct root_squash_info *squash = &sbi->ll_squash;
 
-	return sprintf(buf, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
+	seq_printf(m, "%u:%u\n", squash->rsi_uid, squash->rsi_gid);
+	return 0;
 }
 
-static ssize_t root_squash_store(struct kobject *kobj, struct attribute *attr,
-				 const char *buffer, size_t count)
+static ssize_t ll_root_squash_seq_write(struct file *file,
+					const char __user *buffer,
+					size_t count, loff_t *off)
 {
-	struct ll_sb_info *sbi = container_of(kobj, struct ll_sb_info,
-					      ll_kobj);
+	struct seq_file *m = file->private_data;
+	struct super_block *sb = m->private;
+	struct ll_sb_info *sbi = ll_s2sbi(sb);
 	struct root_squash_info *squash = &sbi->ll_squash;
 
 	return lprocfs_wr_root_squash(buffer, count, squash,
-				      ll_get_fsname(sbi->ll_sb, NULL, 0));
+				      ll_get_fsname(sb, NULL, 0));
 }
-LUSTRE_RW_ATTR(root_squash);
+LPROC_SEQ_FOPS(ll_root_squash);
 
 static int ll_nosquash_nids_seq_show(struct seq_file *m, void *v)
 {
@@ -997,6 +999,8 @@ static struct lprocfs_vars lprocfs_llite_obd_vars[] = {
 	{ "statahead_stats",  &ll_statahead_stats_fops, NULL, 0 },
 	{ "unstable_stats",   &ll_unstable_stats_fops, NULL },
 	{ "sbi_flags",	      &ll_sbi_flags_fops, NULL, 0 },
+	{ .name =       "root_squash",
+	  .fops =       &ll_root_squash_fops			},
 	{ .name =		"nosquash_nids",
 	  .fops =		&ll_nosquash_nids_fops		},
 	{ NULL }
@@ -1027,7 +1031,6 @@ static struct attribute *llite_attrs[] = {
 	&lustre_attr_max_easize.attr,
 	&lustre_attr_default_easize.attr,
 	&lustre_attr_xattr_cache.attr,
-	&lustre_attr_root_squash.attr,
 	NULL,
 };
 
diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c
index a8f4e7fb0a46..fc176540bb95 100644
--- a/drivers/staging/lustre/lustre/llite/namei.c
+++ b/drivers/staging/lustre/lustre/llite/namei.c
@@ -994,11 +994,6 @@ static int ll_create_nd(struct inode *dir, struct dentry *dentry,
 	return rc;
 }
 
-/* ll_unlink() doesn't update the inode with the new link count.
- * Instead, ll_ddelete() and ll_d_iput() will update it based upon if there
- * is any lock existing. They will recycle dentries and inodes based upon locks
- * too. b=20433
- */
 static int ll_unlink(struct inode *dir, struct dentry *dchild)
 {
 	struct ptlrpc_request *request = NULL;
@@ -1041,7 +1036,7 @@ static int ll_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 
 	if (!IS_POSIXACL(dir) || !exp_connect_umask(ll_i2mdexp(dir)))
 		mode &= ~current_umask();
-	mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
+	mode = (mode & (0777 | S_ISVTX)) | S_IFDIR;
 
 	err = ll_new_node(dir, dentry, NULL, mode, 0, LUSTRE_OPC_MKDIR);
 	if (!err)
@@ -1089,7 +1084,7 @@ static int ll_symlink(struct inode *dir, struct dentry *dentry,
 	CDEBUG(D_VFSTRACE, "VFS Op:name=%pd, dir="DFID"(%p),target=%.*s\n",
 	       dentry, PFID(ll_inode2fid(dir)), dir, 3000, oldname);
 
-	err = ll_new_node(dir, dentry, oldname, S_IFLNK | S_IRWXUGO,
+	err = ll_new_node(dir, dentry, oldname, S_IFLNK | 0777,
 			  0, LUSTRE_OPC_SYMLINK);
 
 	if (!err)
diff --git a/drivers/staging/lustre/lustre/llite/range_lock.c b/drivers/staging/lustre/lustre/llite/range_lock.c
index 94c818f1478b..14148a097476 100644
--- a/drivers/staging/lustre/lustre/llite/range_lock.c
+++ b/drivers/staging/lustre/lustre/llite/range_lock.c
@@ -61,17 +61,23 @@ void range_lock_tree_init(struct range_lock_tree *tree)
  * Pre:  Caller should have allocated the range lock node.
  * Post: The range lock node is meant to cover [start, end] region
  */
-void range_lock_init(struct range_lock *lock, __u64 start, __u64 end)
+int range_lock_init(struct range_lock *lock, __u64 start, __u64 end)
 {
+	int rc;
+
 	memset(&lock->rl_node, 0, sizeof(lock->rl_node));
 	if (end != LUSTRE_EOF)
 		end >>= PAGE_SHIFT;
-	interval_set(&lock->rl_node, start >> PAGE_SHIFT, end);
+	rc = interval_set(&lock->rl_node, start >> PAGE_SHIFT, end);
+	if (rc)
+		return rc;
+
 	INIT_LIST_HEAD(&lock->rl_next_lock);
 	lock->rl_task = NULL;
 	lock->rl_lock_count = 0;
 	lock->rl_blocking_ranges = 0;
 	lock->rl_sequence = 0;
+	return rc;
 }
 
 static inline struct range_lock *next_lock(struct range_lock *lock)
diff --git a/drivers/staging/lustre/lustre/llite/range_lock.h b/drivers/staging/lustre/lustre/llite/range_lock.h
index c6d04a6f99fd..779091ccec4e 100644
--- a/drivers/staging/lustre/lustre/llite/range_lock.h
+++ b/drivers/staging/lustre/lustre/llite/range_lock.h
@@ -76,7 +76,7 @@ struct range_lock_tree {
 };
 
 void range_lock_tree_init(struct range_lock_tree *tree);
-void range_lock_init(struct range_lock *lock, __u64 start, __u64 end);
+int range_lock_init(struct range_lock *lock, __u64 start, __u64 end);
 int  range_lock(struct range_lock_tree *tree, struct range_lock *lock);
 void range_unlock(struct range_lock_tree *tree, struct range_lock *lock);
 #endif
diff --git a/drivers/staging/lustre/lustre/llite/rw.c b/drivers/staging/lustre/lustre/llite/rw.c
index f10e092979fe..50d027e0cfab 100644
--- a/drivers/staging/lustre/lustre/llite/rw.c
+++ b/drivers/staging/lustre/lustre/llite/rw.c
@@ -92,25 +92,6 @@ static unsigned long ll_ra_count_get(struct ll_sb_info *sbi,
 		goto out;
 	}
 
-	/* If the non-strided (ria_pages == 0) readahead window
-	 * (ria_start + ret) has grown across an RPC boundary, then trim
-	 * readahead size by the amount beyond the RPC so it ends on an
-	 * RPC boundary. If the readahead window is already ending on
-	 * an RPC boundary (beyond_rpc == 0), or smaller than a full
-	 * RPC (beyond_rpc < ret) the readahead size is unchanged.
-	 * The (beyond_rpc != 0) check is skipped since the conditional
-	 * branch is more expensive than subtracting zero from the result.
-	 *
-	 * Strided read is left unaligned to avoid small fragments beyond
-	 * the RPC boundary from needing an extra read RPC.
-	 */
-	if (ria->ria_pages == 0) {
-		long beyond_rpc = (ria->ria_start + ret) % PTLRPC_MAX_BRW_PAGES;
-
-		if (/* beyond_rpc != 0 && */ beyond_rpc < ret)
-			ret -= beyond_rpc;
-	}
-
 	if (atomic_add_return(ret, &ra->ra_cur_pages) > ra->ra_max_pages) {
 		atomic_sub(ret, &ra->ra_cur_pages);
 		ret = 0;
@@ -147,11 +128,12 @@ void ll_ra_stats_inc(struct inode *inode, enum ra_stat which)
 
 #define RAS_CDEBUG(ras) \
 	CDEBUG(D_READA,						      \
-	       "lrp %lu cr %lu cp %lu ws %lu wl %lu nra %lu r %lu ri %lu"    \
-	       "csr %lu sf %lu sp %lu sl %lu\n",			    \
+	       "lrp %lu cr %lu cp %lu ws %lu wl %lu nra %lu rpc %lu "	     \
+	       "r %lu ri %lu csr %lu sf %lu sp %lu sl %lu\n",		     \
 	       ras->ras_last_readpage, ras->ras_consecutive_requests,	\
 	       ras->ras_consecutive_pages, ras->ras_window_start,	    \
 	       ras->ras_window_len, ras->ras_next_readahead,		 \
+	       ras->ras_rpc_size,					     \
 	       ras->ras_requests, ras->ras_request_index,		    \
 	       ras->ras_consecutive_stride_requests, ras->ras_stride_offset, \
 	       ras->ras_stride_pages, ras->ras_stride_length)
@@ -261,20 +243,6 @@ out:
 	ria->ria_start, ria->ria_end, ria->ria_stoff, ria->ria_length,\
 	ria->ria_pages)
 
-/* Limit this to the blocksize instead of PTLRPC_BRW_MAX_SIZE, since we don't
- * know what the actual RPC size is.  If this needs to change, it makes more
- * sense to tune the i_blkbits value for the file based on the OSTs it is
- * striped over, rather than having a constant value for all files here.
- */
-
-/* RAS_INCREASE_STEP should be (1UL << (inode->i_blkbits - PAGE_SHIFT)).
- * Temporarily set RAS_INCREASE_STEP to 1MB. After 4MB RPC is enabled
- * by default, this should be adjusted corresponding with max_read_ahead_mb
- * and max_read_ahead_per_file_mb otherwise the readahead budget can be used
- * up quickly which will affect read performance significantly. See LU-2816
- */
-#define RAS_INCREASE_STEP(inode) (ONE_MB_BRW_SIZE >> PAGE_SHIFT)
-
 static inline int stride_io_mode(struct ll_readahead_state *ras)
 {
 	return ras->ras_consecutive_stride_requests > 1;
@@ -345,6 +313,17 @@ static int ria_page_count(struct ra_io_arg *ria)
 			       length);
 }
 
+static unsigned long ras_align(struct ll_readahead_state *ras,
+			       unsigned long index,
+			       unsigned long *remainder)
+{
+	unsigned long rem = index % ras->ras_rpc_size;
+
+	if (remainder)
+		*remainder = rem;
+	return index - rem;
+}
+
 /*Check whether the index is in the defined ra-window */
 static int ras_inside_ra_window(unsigned long idx, struct ra_io_arg *ria)
 {
@@ -358,42 +337,63 @@ static int ras_inside_ra_window(unsigned long idx, struct ra_io_arg *ria)
 		ria->ria_length < ria->ria_pages);
 }
 
-static int ll_read_ahead_pages(const struct lu_env *env,
-			       struct cl_io *io, struct cl_page_list *queue,
-			       struct ra_io_arg *ria,
-			       unsigned long *reserved_pages,
-			       pgoff_t *ra_end)
+static unsigned long
+ll_read_ahead_pages(const struct lu_env *env, struct cl_io *io,
+		    struct cl_page_list *queue, struct ll_readahead_state *ras,
+		    struct ra_io_arg *ria)
 {
 	struct cl_read_ahead ra = { 0 };
-	int rc, count = 0;
+	unsigned long ra_end = 0;
 	bool stride_ria;
 	pgoff_t page_idx;
+	int rc;
 
 	LASSERT(ria);
 	RIA_DEBUG(ria);
 
 	stride_ria = ria->ria_length > ria->ria_pages && ria->ria_pages > 0;
 	for (page_idx = ria->ria_start;
-	     page_idx <= ria->ria_end && *reserved_pages > 0; page_idx++) {
+	     page_idx <= ria->ria_end && ria->ria_reserved > 0; page_idx++) {
 		if (ras_inside_ra_window(page_idx, ria)) {
 			if (!ra.cra_end || ra.cra_end < page_idx) {
+				unsigned long end;
+
 				cl_read_ahead_release(env, &ra);
 
 				rc = cl_io_read_ahead(env, io, page_idx, &ra);
 				if (rc < 0)
 					break;
 
+				CDEBUG(D_READA, "idx: %lu, ra: %lu, rpc: %lu\n",
+				       page_idx, ra.cra_end, ra.cra_rpc_size);
 				LASSERTF(ra.cra_end >= page_idx,
 					 "object: %p, indcies %lu / %lu\n",
 					 io->ci_obj, ra.cra_end, page_idx);
+				/*
+				 * update read ahead RPC size.
+				 * NB: it's racy but doesn't matter
+				 */
+				if (ras->ras_rpc_size > ra.cra_rpc_size &&
+				    ra.cra_rpc_size > 0)
+					ras->ras_rpc_size = ra.cra_rpc_size;
+				/* trim it to align with optimal RPC size */
+				end = ras_align(ras, ria->ria_end + 1, NULL);
+				if (end > 0 && !ria->ria_eof)
+					ria->ria_end = end - 1;
+				if (ria->ria_end < ria->ria_end_min)
+					ria->ria_end = ria->ria_end_min;
+				if (ria->ria_end > ra.cra_end)
+					ria->ria_end = ra.cra_end;
 			}
 
-			/* If the page is inside the read-ahead window*/
+			/* If the page is inside the read-ahead window */
 			rc = ll_read_ahead_page(env, io, queue, page_idx);
-			if (!rc) {
-				(*reserved_pages)--;
-				count++;
-			}
+			if (rc < 0)
+				break;
+
+			ra_end = page_idx;
+			if (!rc)
+				ria->ria_reserved--;
 		} else if (stride_ria) {
 			/* If it is not in the read-ahead window, and it is
 			 * read-ahead mode, then check whether it should skip
@@ -420,8 +420,7 @@ static int ll_read_ahead_pages(const struct lu_env *env,
 	}
 	cl_read_ahead_release(env, &ra);
 
-	*ra_end = page_idx;
-	return count;
+	return ra_end;
 }
 
 static int ll_readahead(const struct lu_env *env, struct cl_io *io,
@@ -431,7 +430,7 @@ static int ll_readahead(const struct lu_env *env, struct cl_io *io,
 	struct vvp_io *vio = vvp_env_io(env);
 	struct ll_thread_info *lti = ll_env_info(env);
 	struct cl_attr *attr = vvp_env_thread_attr(env);
-	unsigned long len, mlen = 0, reserved;
+	unsigned long len, mlen = 0;
 	pgoff_t ra_end, start = 0, end = 0;
 	struct inode *inode;
 	struct ra_io_arg *ria = &lti->lti_ria;
@@ -478,29 +477,15 @@ static int ll_readahead(const struct lu_env *env, struct cl_io *io,
 	    end < vio->vui_ra_start + vio->vui_ra_count - 1)
 		end = vio->vui_ra_start + vio->vui_ra_count - 1;
 
-	if (end != 0) {
-		unsigned long rpc_boundary;
-		/*
-		 * Align RA window to an optimal boundary.
-		 *
-		 * XXX This would be better to align to cl_max_pages_per_rpc
-		 * instead of PTLRPC_MAX_BRW_PAGES, because the RPC size may
-		 * be aligned to the RAID stripe size in the future and that
-		 * is more important than the RPC size.
-		 */
-		/* Note: we only trim the RPC, instead of extending the RPC
-		 * to the boundary, so to avoid reading too much pages during
-		 * random reading.
-		 */
-		rpc_boundary = (end + 1) & (~(PTLRPC_MAX_BRW_PAGES - 1));
-		if (rpc_boundary > 0)
-			rpc_boundary--;
-
-		if (rpc_boundary  > start)
-			end = rpc_boundary;
+	if (end) {
+		unsigned long end_index;
 
 		/* Truncate RA window to end of file */
-		end = min(end, (unsigned long)((kms - 1) >> PAGE_SHIFT));
+		end_index = (unsigned long)((kms - 1) >> PAGE_SHIFT);
+		if (end_index <= end) {
+			end = end_index;
+			ria->ria_eof = true;
+		}
 
 		ras->ras_next_readahead = max(end, end + 1);
 		RAS_CDEBUG(ras);
@@ -535,28 +520,31 @@ static int ll_readahead(const struct lu_env *env, struct cl_io *io,
 	/* at least to extend the readahead window to cover current read */
 	if (!hit && vio->vui_ra_valid &&
 	    vio->vui_ra_start + vio->vui_ra_count > ria->ria_start) {
+		unsigned long remainder;
+
 		/* to the end of current read window. */
 		mlen = vio->vui_ra_start + vio->vui_ra_count - ria->ria_start;
 		/* trim to RPC boundary */
-		start = ria->ria_start & (PTLRPC_MAX_BRW_PAGES - 1);
-		mlen = min(mlen, PTLRPC_MAX_BRW_PAGES - start);
+		ras_align(ras, ria->ria_start, &remainder);
+		mlen = min(mlen, ras->ras_rpc_size - remainder);
+		ria->ria_end_min = ria->ria_start + mlen;
 	}
 
-	reserved = ll_ra_count_get(ll_i2sbi(inode), ria, len, mlen);
-	if (reserved < len)
+	ria->ria_reserved = ll_ra_count_get(ll_i2sbi(inode), ria, len, mlen);
+	if (ria->ria_reserved < len)
 		ll_ra_stats_inc(inode, RA_STAT_MAX_IN_FLIGHT);
 
 	CDEBUG(D_READA, "reserved pages %lu/%lu/%lu, ra_cur %d, ra_max %lu\n",
-	       reserved, len, mlen,
+	       ria->ria_reserved, len, mlen,
 	       atomic_read(&ll_i2sbi(inode)->ll_ra_info.ra_cur_pages),
 	       ll_i2sbi(inode)->ll_ra_info.ra_max_pages);
 
-	ret = ll_read_ahead_pages(env, io, queue, ria, &reserved, &ra_end);
+	ra_end = ll_read_ahead_pages(env, io, queue, ras, ria);
 
-	if (reserved != 0)
-		ll_ra_count_put(ll_i2sbi(inode), reserved);
+	if (ria->ria_reserved)
+		ll_ra_count_put(ll_i2sbi(inode), ria->ria_reserved);
 
-	if (ra_end == end + 1 && ra_end == (kms >> PAGE_SHIFT))
+	if (ra_end == end && ra_end == (kms >> PAGE_SHIFT))
 		ll_ra_stats_inc(inode, RA_STAT_EOF);
 
 	/* if we didn't get to the end of the region we reserved from
@@ -568,13 +556,13 @@ static int ll_readahead(const struct lu_env *env, struct cl_io *io,
 	CDEBUG(D_READA, "ra_end = %lu end = %lu stride end = %lu pages = %d\n",
 	       ra_end, end, ria->ria_end, ret);
 
-	if (ra_end != end + 1) {
+	if (ra_end > 0 && ra_end != end) {
 		ll_ra_stats_inc(inode, RA_STAT_FAILED_REACH_END);
 		spin_lock(&ras->ras_lock);
-		if (ra_end < ras->ras_next_readahead &&
+		if (ra_end <= ras->ras_next_readahead &&
 		    index_in_window(ra_end, ras->ras_window_start, 0,
 				    ras->ras_window_len)) {
-			ras->ras_next_readahead = ra_end;
+			ras->ras_next_readahead = ra_end + 1;
 			RAS_CDEBUG(ras);
 		}
 		spin_unlock(&ras->ras_lock);
@@ -586,7 +574,7 @@ static int ll_readahead(const struct lu_env *env, struct cl_io *io,
 static void ras_set_start(struct inode *inode, struct ll_readahead_state *ras,
 			  unsigned long index)
 {
-	ras->ras_window_start = index & (~(RAS_INCREASE_STEP(inode) - 1));
+	ras->ras_window_start = ras_align(ras, index, NULL);
 }
 
 /* called with the ras_lock held or from places where it doesn't matter */
@@ -615,6 +603,7 @@ static void ras_stride_reset(struct ll_readahead_state *ras)
 void ll_readahead_init(struct inode *inode, struct ll_readahead_state *ras)
 {
 	spin_lock_init(&ras->ras_lock);
+	ras->ras_rpc_size = PTLRPC_MAX_BRW_PAGES;
 	ras_reset(inode, ras, 0);
 	ras->ras_requests = 0;
 }
@@ -719,12 +708,15 @@ static void ras_increase_window(struct inode *inode,
 	 * but current clio architecture does not support retrieve such
 	 * information from lower layer. FIXME later
 	 */
-	if (stride_io_mode(ras))
-		ras_stride_increase_window(ras, ra, RAS_INCREASE_STEP(inode));
-	else
-		ras->ras_window_len = min(ras->ras_window_len +
-					  RAS_INCREASE_STEP(inode),
-					  ra->ra_max_pages_per_file);
+	if (stride_io_mode(ras)) {
+		ras_stride_increase_window(ras, ra, ras->ras_rpc_size);
+	} else {
+		unsigned long wlen;
+
+		wlen = min(ras->ras_window_len + ras->ras_rpc_size,
+			   ra->ra_max_pages_per_file);
+		ras->ras_window_len = ras_align(ras, wlen, NULL);
+	}
 }
 
 static void ras_update(struct ll_sb_info *sbi, struct inode *inode,
@@ -737,6 +729,10 @@ static void ras_update(struct ll_sb_info *sbi, struct inode *inode,
 
 	spin_lock(&ras->ras_lock);
 
+	if (!hit)
+		CDEBUG(D_READA, DFID " pages at %lu miss.\n",
+		       PFID(ll_inode2fid(inode)), index);
+
 	ll_ra_stats_inc_sbi(sbi, hit ? RA_STAT_HIT : RA_STAT_MISS);
 
 	/* reset the read-ahead window in two cases.  First when the app seeks
@@ -852,6 +848,8 @@ static void ras_update(struct ll_sb_info *sbi, struct inode *inode,
 		 * instead of ras_window_start, which is RPC aligned
 		 */
 		ras->ras_next_readahead = max(index, ras->ras_next_readahead);
+		ras->ras_window_start = max(ras->ras_stride_offset,
+					    ras->ras_window_start);
 	} else {
 		if (ras->ras_next_readahead < ras->ras_window_start)
 			ras->ras_next_readahead = ras->ras_window_start;
@@ -881,7 +879,7 @@ static void ras_update(struct ll_sb_info *sbi, struct inode *inode,
 		 */
 		ras->ras_next_readahead = max(index, ras->ras_next_readahead);
 		ras->ras_stride_offset = index;
-		ras->ras_window_len = RAS_INCREASE_STEP(inode);
+		ras->ras_window_start = max(index, ras->ras_window_start);
 	}
 
 	/* The initial ras_window_len is set to the request size.  To avoid
@@ -1098,38 +1096,39 @@ static int ll_io_read_page(const struct lu_env *env, struct cl_io *io,
 	struct cl_2queue *queue  = &io->ci_queue;
 	struct ll_sb_info *sbi = ll_i2sbi(inode);
 	struct vvp_page *vpg;
+	bool uptodate;
 	int rc = 0;
 
 	vpg = cl2vvp_page(cl_object_page_slice(page->cp_obj, page));
+	uptodate = vpg->vpg_defer_uptodate;
+
 	if (sbi->ll_ra_info.ra_max_pages_per_file > 0 &&
 	    sbi->ll_ra_info.ra_max_pages > 0) {
 		struct vvp_io *vio = vvp_env_io(env);
 		enum ras_update_flags flags = 0;
 
-		if (vpg->vpg_defer_uptodate)
+		if (uptodate)
 			flags |= LL_RAS_HIT;
 		if (!vio->vui_ra_valid)
 			flags |= LL_RAS_MMAP;
 		ras_update(sbi, inode, ras, vvp_index(vpg), flags);
 	}
 
-	if (vpg->vpg_defer_uptodate) {
+	cl_2queue_init(queue);
+	if (uptodate) {
 		vpg->vpg_ra_used = 1;
 		cl_page_export(env, page, 1);
+		cl_page_disown(env, io, page);
+	} else {
+		cl_page_list_add(&queue->c2_qin, page);
 	}
 
-	cl_2queue_init(queue);
-	/*
-	 * Add page into the queue even when it is marked uptodate above.
-	 * this will unlock it automatically as part of cl_page_list_disown().
-	 */
-	cl_page_list_add(&queue->c2_qin, page);
 	if (sbi->ll_ra_info.ra_max_pages_per_file > 0 &&
 	    sbi->ll_ra_info.ra_max_pages > 0) {
 		int rc2;
 
 		rc2 = ll_readahead(env, io, &queue->c2_qin, ras,
-				   vpg->vpg_defer_uptodate);
+				   uptodate);
 		CDEBUG(D_READA, DFID "%d pages read ahead at %lu\n",
 		       PFID(ll_inode2fid(inode)), rc2, vvp_index(vpg));
 	}
diff --git a/drivers/staging/lustre/lustre/llite/rw26.c b/drivers/staging/lustre/lustre/llite/rw26.c
index 21e06e5b514e..d89e79599199 100644
--- a/drivers/staging/lustre/lustre/llite/rw26.c
+++ b/drivers/staging/lustre/lustre/llite/rw26.c
@@ -345,6 +345,10 @@ static ssize_t ll_direct_IO_26(struct kiocb *iocb, struct iov_iter *iter)
 	ssize_t tot_bytes = 0, result = 0;
 	long size = MAX_DIO_SIZE;
 
+	/* Check EOF by ourselves */
+	if (iov_iter_rw(iter) == READ && file_offset >= i_size_read(inode))
+		return 0;
+
 	/* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
 	if ((file_offset & ~PAGE_MASK) || (count & ~PAGE_MASK))
 		return -EINVAL;
diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
index f1ee17f9ec0d..fb7c315b33cb 100644
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -79,6 +79,8 @@ struct sa_entry {
 	struct inode	   *se_inode;
 	/* entry name */
 	struct qstr	     se_qstr;
+	/* entry fid */
+	struct lu_fid		se_fid;
 };
 
 static unsigned int sai_generation;
@@ -169,7 +171,7 @@ static inline int is_omitted_entry(struct ll_statahead_info *sai, __u64 index)
 /* allocate sa_entry and hash it to allow scanner process to find it */
 static struct sa_entry *
 sa_alloc(struct dentry *parent, struct ll_statahead_info *sai, __u64 index,
-	 const char *name, int len)
+	 const char *name, int len, const struct lu_fid *fid)
 {
 	struct ll_inode_info *lli;
 	struct sa_entry   *entry;
@@ -194,6 +196,7 @@ sa_alloc(struct dentry *parent, struct ll_statahead_info *sai, __u64 index,
 	entry->se_qstr.hash = full_name_hash(parent, name, len);
 	entry->se_qstr.len = len;
 	entry->se_qstr.name = dname;
+	entry->se_fid = *fid;
 
 	lli = ll_i2info(sai->sai_dentry->d_inode);
 	spin_lock(&lli->lli_sa_lock);
@@ -566,24 +569,8 @@ static void sa_instantiate(struct ll_statahead_info *sai,
 	}
 
 	child = entry->se_inode;
-	if (!child) {
-		/*
-		 * lookup.
-		 */
-		LASSERT(fid_is_zero(&minfo->mi_data.op_fid2));
-
-		/* XXX: No fid in reply, this is probably cross-ref case.
-		 * SA can't handle it yet.
-		 */
-		if (body->mbo_valid & OBD_MD_MDS) {
-			rc = -EAGAIN;
-			goto out;
-		}
-	} else {
-		/*
-		 * revalidate.
-		 */
-		/* unlinked and re-created with the same name */
+	if (child) {
+		/* revalidate; unlinked and re-created with the same name */
 		if (unlikely(!lu_fid_eq(&minfo->mi_data.op_fid2, &body->mbo_fid1))) {
 			entry->se_inode = NULL;
 			iput(child);
@@ -720,50 +707,42 @@ static int ll_statahead_interpret(struct ptlrpc_request *req,
 }
 
 /* finish async stat RPC arguments */
-static void sa_fini_data(struct md_enqueue_info *minfo,
-			 struct ldlm_enqueue_info *einfo)
+static void sa_fini_data(struct md_enqueue_info *minfo)
 {
-	LASSERT(minfo && einfo);
 	iput(minfo->mi_dir);
 	kfree(minfo);
-	kfree(einfo);
 }
 
 /**
  * prepare arguments for async stat RPC.
  */
-static int sa_prep_data(struct inode *dir, struct inode *child,
-			struct sa_entry *entry, struct md_enqueue_info **pmi,
-			struct ldlm_enqueue_info **pei)
+static struct md_enqueue_info *
+sa_prep_data(struct inode *dir, struct inode *child, struct sa_entry *entry)
 {
-	const struct qstr      *qstr = &entry->se_qstr;
 	struct md_enqueue_info   *minfo;
 	struct ldlm_enqueue_info *einfo;
 	struct md_op_data	*op_data;
 
-	einfo = kzalloc(sizeof(*einfo), GFP_NOFS);
-	if (!einfo)
-		return -ENOMEM;
-
 	minfo = kzalloc(sizeof(*minfo), GFP_NOFS);
-	if (!minfo) {
-		kfree(einfo);
-		return -ENOMEM;
-	}
+	if (!minfo)
+		return ERR_PTR(-ENOMEM);
 
-	op_data = ll_prep_md_op_data(&minfo->mi_data, dir, child, qstr->name,
-				     qstr->len, 0, LUSTRE_OPC_ANY, NULL);
+	op_data = ll_prep_md_op_data(&minfo->mi_data, dir, child, NULL, 0, 0,
+				     LUSTRE_OPC_ANY, NULL);
 	if (IS_ERR(op_data)) {
-		kfree(einfo);
 		kfree(minfo);
-		return PTR_ERR(op_data);
+		return (struct md_enqueue_info *)op_data;
 	}
 
+	if (!child)
+		op_data->op_fid2 = entry->se_fid;
+
 	minfo->mi_it.it_op = IT_GETATTR;
 	minfo->mi_dir = igrab(dir);
 	minfo->mi_cb = ll_statahead_interpret;
 	minfo->mi_cbdata = entry;
 
+	einfo = &minfo->mi_einfo;
 	einfo->ei_type   = LDLM_IBITS;
 	einfo->ei_mode   = it_to_lock_mode(&minfo->mi_it);
 	einfo->ei_cb_bl  = ll_md_blocking_ast;
@@ -771,26 +750,22 @@ static int sa_prep_data(struct inode *dir, struct inode *child,
 	einfo->ei_cb_gl  = NULL;
 	einfo->ei_cbdata = NULL;
 
-	*pmi = minfo;
-	*pei = einfo;
-
-	return 0;
+	return minfo;
 }
 
 /* async stat for file not found in dcache */
 static int sa_lookup(struct inode *dir, struct sa_entry *entry)
 {
 	struct md_enqueue_info   *minfo;
-	struct ldlm_enqueue_info *einfo;
 	int		       rc;
 
-	rc = sa_prep_data(dir, NULL, entry, &minfo, &einfo);
-	if (rc)
-		return rc;
+	minfo = sa_prep_data(dir, NULL, entry);
+	if (IS_ERR(minfo))
+		return PTR_ERR(minfo);
 
-	rc = md_intent_getattr_async(ll_i2mdexp(dir), minfo, einfo);
+	rc = md_intent_getattr_async(ll_i2mdexp(dir), minfo);
 	if (rc)
-		sa_fini_data(minfo, einfo);
+		sa_fini_data(minfo);
 
 	return rc;
 }
@@ -809,7 +784,6 @@ static int sa_revalidate(struct inode *dir, struct sa_entry *entry,
 	struct lookup_intent      it = { .it_op = IT_GETATTR,
 					 .it_lock_handle = 0 };
 	struct md_enqueue_info   *minfo;
-	struct ldlm_enqueue_info *einfo;
 	int rc;
 
 	if (unlikely(!inode))
@@ -827,25 +801,26 @@ static int sa_revalidate(struct inode *dir, struct sa_entry *entry,
 		return 1;
 	}
 
-	rc = sa_prep_data(dir, inode, entry, &minfo, &einfo);
-	if (rc) {
+	minfo = sa_prep_data(dir, inode, entry);
+	if (IS_ERR(minfo)) {
 		entry->se_inode = NULL;
 		iput(inode);
-		return rc;
+		return PTR_ERR(minfo);
 	}
 
-	rc = md_intent_getattr_async(ll_i2mdexp(dir), minfo, einfo);
+	rc = md_intent_getattr_async(ll_i2mdexp(dir), minfo);
 	if (rc) {
 		entry->se_inode = NULL;
 		iput(inode);
-		sa_fini_data(minfo, einfo);
+		sa_fini_data(minfo);
 	}
 
 	return rc;
 }
 
 /* async stat for file with @name */
-static void sa_statahead(struct dentry *parent, const char *name, int len)
+static void sa_statahead(struct dentry *parent, const char *name, int len,
+			 const struct lu_fid *fid)
 {
 	struct inode	     *dir    = d_inode(parent);
 	struct ll_inode_info     *lli    = ll_i2info(dir);
@@ -854,7 +829,7 @@ static void sa_statahead(struct dentry *parent, const char *name, int len)
 	struct sa_entry *entry;
 	int		       rc;
 
-	entry = sa_alloc(parent, sai, sai->sai_index, name, len);
+	entry = sa_alloc(parent, sai, sai->sai_index, name, len, fid);
 	if (IS_ERR(entry))
 		return;
 
@@ -1043,6 +1018,7 @@ static int ll_statahead_thread(void *arg)
 		for (ent = lu_dirent_start(dp);
 		     ent && thread_is_running(sa_thread) && !sa_low_hit(sai);
 		     ent = lu_dirent_next(ent)) {
+			struct lu_fid fid;
 			__u64 hash;
 			int namelen;
 			char *name;
@@ -1088,6 +1064,8 @@ static int ll_statahead_thread(void *arg)
 			if (unlikely(++first == 1))
 				continue;
 
+			fid_le_to_cpu(&fid, &ent->lde_fid);
+
 			/* wait for spare statahead window */
 			do {
 				l_wait_event(sa_thread->t_ctl_waitq,
@@ -1117,7 +1095,7 @@ static int ll_statahead_thread(void *arg)
 			} while (sa_sent_full(sai) &&
 				 thread_is_running(sa_thread));
 
-			sa_statahead(parent, name, namelen);
+			sa_statahead(parent, name, namelen, &fid);
 		}
 
 		pos = le64_to_cpu(dp->ldp_hash_end);
diff --git a/drivers/staging/lustre/lustre/llite/super25.c b/drivers/staging/lustre/lustre/llite/super25.c
index 106cd00910a7..4759802e062d 100644
--- a/drivers/staging/lustre/lustre/llite/super25.c
+++ b/drivers/staging/lustre/lustre/llite/super25.c
@@ -88,7 +88,7 @@ static int __init lustre_init(void)
 	struct timespec64 ts;
 	int i, rc, seed[2];
 
-	CLASSERT(sizeof(LUSTRE_VOLATILE_HDR) == LUSTRE_VOLATILE_HDR_LEN + 1);
+	BUILD_BUG_ON(sizeof(LUSTRE_VOLATILE_HDR) != LUSTRE_VOLATILE_HDR_LEN + 1);
 
 	/* print an address of _any_ initialized kernel symbol from this
 	 * module, to allow debugging with gdb that doesn't support data
diff --git a/drivers/staging/lustre/lustre/llite/vvp_dev.c b/drivers/staging/lustre/lustre/llite/vvp_dev.c
index 12c129f7e4ad..3669ea77ee93 100644
--- a/drivers/staging/lustre/lustre/llite/vvp_dev.c
+++ b/drivers/staging/lustre/lustre/llite/vvp_dev.c
@@ -391,7 +391,7 @@ struct vvp_pgcache_id {
 
 static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id)
 {
-	CLASSERT(sizeof(pos) == sizeof(__u64));
+	BUILD_BUG_ON(sizeof(pos) != sizeof(__u64));
 
 	id->vpi_index  = pos & 0xffffffff;
 	id->vpi_depth  = (pos >> PGC_DEPTH_SHIFT) & 0xf;
diff --git a/drivers/staging/lustre/lustre/llite/vvp_internal.h b/drivers/staging/lustre/lustre/llite/vvp_internal.h
index c60d0414ac25..f40fd7f115d1 100644
--- a/drivers/staging/lustre/lustre/llite/vvp_internal.h
+++ b/drivers/staging/lustre/lustre/llite/vvp_internal.h
@@ -301,8 +301,6 @@ static inline struct vvp_lock *cl2vvp_lock(const struct cl_lock_slice *slice)
 # define CLOBINVRNT(env, clob, expr)					\
 	((void)sizeof(env), (void)sizeof(clob), (void)sizeof(!!(expr)))
 
-int lov_read_and_clear_async_rc(struct cl_object *clob);
-
 int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
 		struct cl_io *io);
 int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io);
diff --git a/drivers/staging/lustre/lustre/llite/vvp_io.c b/drivers/staging/lustre/lustre/llite/vvp_io.c
index 697cbfbe9374..3e9cf710501b 100644
--- a/drivers/staging/lustre/lustre/llite/vvp_io.c
+++ b/drivers/staging/lustre/lustre/llite/vvp_io.c
@@ -288,7 +288,7 @@ static void vvp_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
 	       io->ci_ignore_layout, io->ci_verify_layout,
 	       vio->vui_layout_gen, io->ci_restore_needed);
 
-	if (io->ci_restore_needed == 1) {
+	if (io->ci_restore_needed) {
 		int	rc;
 
 		/* file was detected release, we need to restore it
@@ -657,7 +657,15 @@ static void vvp_io_setattr_end(const struct lu_env *env,
 static void vvp_io_setattr_fini(const struct lu_env *env,
 				const struct cl_io_slice *ios)
 {
+	bool restore_needed = ios->cis_io->ci_restore_needed;
+	struct inode *inode = vvp_object_inode(ios->cis_obj);
+
 	vvp_io_fini(env, ios);
+
+	if (restore_needed && !ios->cis_io->ci_restore_needed) {
+		/* restore finished, set data modified flag for HSM */
+		set_bit(LLIF_DATA_MODIFIED, &(ll_i2info(inode))->lli_flags);
+	}
 }
 
 static int vvp_io_read_start(const struct lu_env *env,
@@ -1340,13 +1348,6 @@ int vvp_io_init(const struct lu_env *env, struct cl_object *obj,
 			io->ci_lockreq = CILR_MANDATORY;
 	}
 
-	/* ignore layout change for generic CIT_MISC but not for glimpse.
-	 * io context for glimpse must set ci_verify_layout to true,
-	 * see cl_glimpse_size0() for details.
-	 */
-	if (io->ci_type == CIT_MISC && !io->ci_verify_layout)
-		io->ci_ignore_layout = 1;
-
 	/* Enqueue layout lock and get layout version. We need to do this
 	 * even for operations requiring to open file, such as read and write,
 	 * because it might not grant layout lock in IT_OPEN.
diff --git a/drivers/staging/lustre/lustre/llite/vvp_page.c b/drivers/staging/lustre/lustre/llite/vvp_page.c
index 23d66308ff20..687c0c79d621 100644
--- a/drivers/staging/lustre/lustre/llite/vvp_page.c
+++ b/drivers/staging/lustre/lustre/llite/vvp_page.c
@@ -227,7 +227,8 @@ static int vvp_page_prep_write(const struct lu_env *env,
  * This takes inode as a separate argument, because inode on which error is to
  * be set can be different from \a vmpage inode in case of direct-io.
  */
-static void vvp_vmpage_error(struct inode *inode, struct page *vmpage, int ioret)
+static void vvp_vmpage_error(struct inode *inode, struct page *vmpage,
+			     int ioret)
 {
 	struct vvp_object *obj = cl_inode2vvp(inode);
 
diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c
index 7a848ebc57c1..421cc04ecf1e 100644
--- a/drivers/staging/lustre/lustre/llite/xattr.c
+++ b/drivers/staging/lustre/lustre/llite/xattr.c
@@ -132,6 +132,15 @@ ll_xattr_set_common(const struct xattr_handler *handler,
 	    (!strcmp(name, "ima") || !strcmp(name, "evm")))
 		return -EOPNOTSUPP;
 
+	/*
+	 * In user.* namespace, only regular files and directories can have
+	 * extended attributes.
+	 */
+	if (handler->flags == XATTR_USER_T) {
+		if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+			return -EPERM;
+	}
+
 	sprintf(fullname, "%s%s\n", handler->prefix, name);
 	rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
 			 valid, fullname, pv, size, 0, flags,
diff --git a/drivers/staging/lustre/lustre/lmv/lmv_intent.c b/drivers/staging/lustre/lustre/lmv/lmv_intent.c
index b1071cf5a70c..aa42066678e0 100644
--- a/drivers/staging/lustre/lustre/lmv/lmv_intent.c
+++ b/drivers/staging/lustre/lustre/lmv/lmv_intent.c
@@ -220,21 +220,7 @@ int lmv_revalidate_slaves(struct obd_export *exp,
 			/* refresh slave from server */
 			body = req_capsule_server_get(&req->rq_pill,
 						      &RMF_MDT_BODY);
-			LASSERT(body);
-
-			if (unlikely(body->mbo_nlink < 2)) {
-				/*
-				 * If this is bad stripe, most likely due
-				 * to the race between close(unlink) and
-				 * getattr, let's return -EONENT, so llite
-				 * will revalidate the dentry see
-				 * ll_inode_revalidate_fini()
-				 */
-				CDEBUG(D_INODE, "%s: nlink %d < 2 corrupt stripe %d "DFID":" DFID"\n",
-				       obd->obd_name, body->mbo_nlink, i,
-				       PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
-				       PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
-
+			if (!body) {
 				if (it.it_lock_mode && lockh) {
 					ldlm_lock_decref(lockh, it.it_lock_mode);
 					it.it_lock_mode = 0;
diff --git a/drivers/staging/lustre/lustre/lmv/lmv_obd.c b/drivers/staging/lustre/lustre/lmv/lmv_obd.c
index f124f6c05ea4..271e18966f50 100644
--- a/drivers/staging/lustre/lustre/lmv/lmv_obd.c
+++ b/drivers/staging/lustre/lustre/lmv/lmv_obd.c
@@ -173,14 +173,7 @@ static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 		 */
 		obd->obd_self_export->exp_connect_data = *conn_data;
 	}
-#if 0
-	else if (ev == OBD_NOTIFY_DISCON) {
-		/*
-		 * For disconnect event, flush fld cache for failout MDS case.
-		 */
-		fld_client_flush(&lmv->lmv_fld);
-	}
-#endif
+
 	/*
 	 * Pass the notification up the chain.
 	 */
@@ -736,16 +729,18 @@ static int lmv_hsm_req_count(struct lmv_obd *lmv,
 	/* count how many requests must be sent to the given target */
 	for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 		curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
+		if (IS_ERR(curr_tgt))
+			return PTR_ERR(curr_tgt);
 		if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 			nr++;
 	}
 	return nr;
 }
 
-static void lmv_hsm_req_build(struct lmv_obd *lmv,
-			      struct hsm_user_request *hur_in,
-			      const struct lmv_tgt_desc *tgt_mds,
-			      struct hsm_user_request *hur_out)
+static int lmv_hsm_req_build(struct lmv_obd *lmv,
+			     struct hsm_user_request *hur_in,
+			     const struct lmv_tgt_desc *tgt_mds,
+			     struct hsm_user_request *hur_out)
 {
 	int			i, nr_out;
 	struct lmv_tgt_desc    *curr_tgt;
@@ -756,6 +751,8 @@ static void lmv_hsm_req_build(struct lmv_obd *lmv,
 	for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 		curr_tgt = lmv_find_target(lmv,
 					   &hur_in->hur_user_item[i].hui_fid);
+		if (IS_ERR(curr_tgt))
+			return PTR_ERR(curr_tgt);
 		if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 			hur_out->hur_user_item[nr_out] =
 				hur_in->hur_user_item[i];
@@ -765,13 +762,14 @@ static void lmv_hsm_req_build(struct lmv_obd *lmv,
 	hur_out->hur_request.hr_itemcount = nr_out;
 	memcpy(hur_data(hur_out), hur_data(hur_in),
 	       hur_in->hur_request.hr_data_len);
+
+	return 0;
 }
 
 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 				 struct lustre_kernelcomm *lk,
 				 void __user *uarg)
 {
-	int rc = 0;
 	__u32 i;
 
 	/* unregister request (call from llapi_hsm_copytool_fini) */
@@ -791,9 +789,7 @@ static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 	 * Unreached coordinators will get EPIPE on next requests
 	 * and will unregister automatically.
 	 */
-	rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group);
-
-	return rc;
+	return libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group);
 }
 
 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
@@ -1044,15 +1040,17 @@ static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 		} else {
 			/* split fid list to their respective MDS */
 			for (i = 0; i < count; i++) {
-				unsigned int		nr, reqlen;
-				int			rc1;
 				struct hsm_user_request *req;
+				size_t reqlen;
+				int nr, rc1;
 
 				tgt = lmv->tgts[i];
 				if (!tgt || !tgt->ltd_exp)
 					continue;
 
 				nr = lmv_hsm_req_count(lmv, hur, tgt);
+				if (nr < 0)
+					return nr;
 				if (nr == 0) /* nothing for this MDS */
 					continue;
 
@@ -1064,10 +1062,13 @@ static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 				if (!req)
 					return -ENOMEM;
 
-				lmv_hsm_req_build(lmv, hur, tgt, req);
+				rc1 = lmv_hsm_req_build(lmv, hur, tgt, req);
+				if (rc1 < 0)
+					goto hsm_req_err;
 
 				rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
 						    req, uarg);
+hsm_req_err:
 				if (rc1 != 0 && rc == 0)
 					rc = rc1;
 				kvfree(req);
@@ -1276,7 +1277,6 @@ static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 	lmv->desc.ld_active_tgt_count = 0;
 	lmv->max_def_easize = 0;
 	lmv->max_easize = 0;
-	lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
 
 	spin_lock_init(&lmv->lmv_lock);
 	mutex_init(&lmv->lmv_init_mutex);
@@ -1425,8 +1425,7 @@ static int lmv_getstatus(struct obd_export *exp,
 	if (rc)
 		return rc;
 
-	rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid);
-	return rc;
+	return md_getstatus(lmv->tgts[0]->ltd_exp, fid);
 }
 
 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
@@ -1447,10 +1446,8 @@ static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
 	if (IS_ERR(tgt))
 		return PTR_ERR(tgt);
 
-	rc = md_getxattr(tgt->ltd_exp, fid, valid, name, input,
+	return md_getxattr(tgt->ltd_exp, fid, valid, name, input,
 			 input_size, output_size, flags, request);
-
-	return rc;
 }
 
 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
@@ -1472,11 +1469,9 @@ static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
 	if (IS_ERR(tgt))
 		return PTR_ERR(tgt);
 
-	rc = md_setxattr(tgt->ltd_exp, fid, valid, name, input,
+	return md_setxattr(tgt->ltd_exp, fid, valid, name, input,
 			 input_size, output_size, flags, suppgid,
 			 request);
-
-	return rc;
 }
 
 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
@@ -1500,9 +1495,7 @@ static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
 		return 0;
 	}
 
-	rc = md_getattr(tgt->ltd_exp, op_data, request);
-
-	return rc;
+	return md_getattr(tgt->ltd_exp, op_data, request);
 }
 
 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
@@ -1549,8 +1542,7 @@ static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
 		return PTR_ERR(tgt);
 
 	CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
-	rc = md_close(tgt->ltd_exp, op_data, mod, request);
-	return rc;
+	return md_close(tgt->ltd_exp, op_data, mod, request);
 }
 
 /**
@@ -1743,10 +1735,8 @@ lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
 	CDEBUG(D_INODE, "ENQUEUE '%s' on " DFID " -> mds #%u\n",
 	       LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
 
-	rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
+	return md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
 			extra_lock_flags);
-
-	return rc;
 }
 
 static int
@@ -1894,9 +1884,7 @@ static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
 	if (rc != 0)
 		return rc;
 
-	rc = md_link(tgt->ltd_exp, op_data, request);
-
-	return rc;
+	return md_link(tgt->ltd_exp, op_data, request);
 }
 
 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
@@ -2109,8 +2097,7 @@ static int lmv_sync(struct obd_export *exp, const struct lu_fid *fid,
 	if (IS_ERR(tgt))
 		return PTR_ERR(tgt);
 
-	rc = md_sync(tgt->ltd_exp, fid, request);
-	return rc;
+	return md_sync(tgt->ltd_exp, fid, request);
 }
 
 /**
@@ -2428,17 +2415,14 @@ static int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
 		return rc;
 
 	if (unlikely(lsm)) {
-		rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
-		return rc;
+		return lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
 	}
 
 	tgt = lmv_find_target(lmv, &op_data->op_fid1);
 	if (IS_ERR(tgt))
 		return PTR_ERR(tgt);
 
-	rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
-
-	return rc;
+	return md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
 }
 
 /**
@@ -2922,13 +2906,11 @@ static int lmv_set_lock_data(struct obd_export *exp,
 {
 	struct lmv_obd	  *lmv = &exp->exp_obd->u.lmv;
 	struct lmv_tgt_desc *tgt = lmv->tgts[0];
-	int		      rc;
 
 	if (!tgt || !tgt->ltd_exp)
 		return -EINVAL;
 
-	rc = md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
-	return rc;
+	return md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
 }
 
 static enum ldlm_mode lmv_lock_match(struct obd_export *exp, __u64 flags,
@@ -3033,25 +3015,40 @@ static int lmv_clear_open_replay_data(struct obd_export *exp,
 }
 
 static int lmv_intent_getattr_async(struct obd_export *exp,
-				    struct md_enqueue_info *minfo,
-				    struct ldlm_enqueue_info *einfo)
+				    struct md_enqueue_info *minfo)
 {
 	struct md_op_data       *op_data = &minfo->mi_data;
 	struct obd_device       *obd = exp->exp_obd;
 	struct lmv_obd	  *lmv = &obd->u.lmv;
-	struct lmv_tgt_desc     *tgt = NULL;
+	struct lmv_tgt_desc *ptgt = NULL;
+	struct lmv_tgt_desc *ctgt = NULL;
 	int		      rc;
 
+	if (!fid_is_sane(&op_data->op_fid2))
+		return -EINVAL;
+
 	rc = lmv_check_connect(obd);
 	if (rc)
 		return rc;
 
-	tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
-	if (IS_ERR(tgt))
-		return PTR_ERR(tgt);
+	ptgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
+	if (IS_ERR(ptgt))
+		return PTR_ERR(ptgt);
 
-	rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
-	return rc;
+	ctgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
+	if (IS_ERR(ctgt))
+		return PTR_ERR(ctgt);
+
+	/*
+	 * if child is on remote MDT, we need 2 async RPCs to fetch both LOOKUP
+	 * lock on parent, and UPDATE lock on child MDT, which makes all
+	 * complicated. Considering remote dir is rare case, and not supporting
+	 * it in statahead won't cause any issue, drop its support for now.
+	 */
+	if (ptgt != ctgt)
+		return -ENOTSUPP;
+
+	return md_intent_getattr_async(ptgt->ltd_exp, minfo);
 }
 
 static int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
@@ -3070,8 +3067,7 @@ static int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
 	if (IS_ERR(tgt))
 		return PTR_ERR(tgt);
 
-	rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
-	return rc;
+	return md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
 }
 
 static int
@@ -3113,8 +3109,7 @@ static int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
 	}
 
 	if (oqctl->qc_cmd != Q_GETOQUOTA) {
-		rc = obd_quotactl(tgt->ltd_exp, oqctl);
-		return rc;
+		return obd_quotactl(tgt->ltd_exp, oqctl);
 	}
 
 	for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
@@ -3234,13 +3229,11 @@ static struct md_ops lmv_md_ops = {
 static int __init lmv_init(void)
 {
 	struct lprocfs_static_vars lvars;
-	int			rc;
 
 	lprocfs_lmv_init_vars(&lvars);
 
-	rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
+	return class_register_type(&lmv_obd_ops, &lmv_md_ops,
 				 LUSTRE_LMV_NAME, NULL);
-	return rc;
 }
 
 static void lmv_exit(void)
diff --git a/drivers/staging/lustre/lustre/lmv/lproc_lmv.c b/drivers/staging/lustre/lustre/lmv/lproc_lmv.c
index 20bbdfc21d15..ff458020b96a 100644
--- a/drivers/staging/lustre/lustre/lmv/lproc_lmv.c
+++ b/drivers/staging/lustre/lustre/lmv/lproc_lmv.c
@@ -50,73 +50,6 @@ static ssize_t numobd_show(struct kobject *kobj, struct attribute *attr,
 }
 LUSTRE_RO_ATTR(numobd);
 
-static const char *placement_name[] = {
-	[PLACEMENT_CHAR_POLICY] = "CHAR",
-	[PLACEMENT_NID_POLICY]  = "NID",
-	[PLACEMENT_INVAL_POLICY]  = "INVAL"
-};
-
-static enum placement_policy placement_name2policy(char *name, int len)
-{
-	int		     i;
-
-	for (i = 0; i < PLACEMENT_MAX_POLICY; i++) {
-		if (!strncmp(placement_name[i], name, len))
-			return i;
-	}
-	return PLACEMENT_INVAL_POLICY;
-}
-
-static const char *placement_policy2name(enum placement_policy placement)
-{
-	LASSERT(placement < PLACEMENT_MAX_POLICY);
-	return placement_name[placement];
-}
-
-static ssize_t placement_show(struct kobject *kobj, struct attribute *attr,
-			      char *buf)
-{
-	struct obd_device *dev = container_of(kobj, struct obd_device,
-					      obd_kobj);
-	struct lmv_obd *lmv;
-
-	lmv = &dev->u.lmv;
-	return sprintf(buf, "%s\n", placement_policy2name(lmv->lmv_placement));
-}
-
-#define MAX_POLICY_STRING_SIZE 64
-
-static ssize_t placement_store(struct kobject *kobj, struct attribute *attr,
-			       const char *buffer,
-			       size_t count)
-{
-	struct obd_device *dev = container_of(kobj, struct obd_device,
-					      obd_kobj);
-	char dummy[MAX_POLICY_STRING_SIZE + 1];
-	enum placement_policy policy;
-	struct lmv_obd *lmv = &dev->u.lmv;
-
-	memcpy(dummy, buffer, MAX_POLICY_STRING_SIZE);
-
-	if (count > MAX_POLICY_STRING_SIZE)
-		count = MAX_POLICY_STRING_SIZE;
-
-	if (dummy[count - 1] == '\n')
-		count--;
-	dummy[count] = '\0';
-
-	policy = placement_name2policy(dummy, count);
-	if (policy != PLACEMENT_INVAL_POLICY) {
-		spin_lock(&lmv->lmv_lock);
-		lmv->lmv_placement = policy;
-		spin_unlock(&lmv->lmv_lock);
-	} else {
-		return -EINVAL;
-	}
-	return count;
-}
-LUSTRE_RW_ATTR(placement);
-
 static ssize_t activeobd_show(struct kobject *kobj, struct attribute *attr,
 			      char *buf)
 {
@@ -147,7 +80,13 @@ static void *lmv_tgt_seq_start(struct seq_file *p, loff_t *pos)
 	struct obd_device       *dev = p->private;
 	struct lmv_obd	  *lmv = &dev->u.lmv;
 
-	return (*pos >= lmv->desc.ld_tgt_count) ? NULL : lmv->tgts[*pos];
+	while (*pos < lmv->tgts_size) {
+		if (lmv->tgts[*pos])
+			return lmv->tgts[*pos];
+		++*pos;
+	}
+
+	return  NULL;
 }
 
 static void lmv_tgt_seq_stop(struct seq_file *p, void *v)
@@ -159,8 +98,15 @@ static void *lmv_tgt_seq_next(struct seq_file *p, void *v, loff_t *pos)
 {
 	struct obd_device       *dev = p->private;
 	struct lmv_obd	  *lmv = &dev->u.lmv;
+
 	++*pos;
-	return (*pos >= lmv->desc.ld_tgt_count) ? NULL : lmv->tgts[*pos];
+	while (*pos < lmv->tgts_size) {
+		if (lmv->tgts[*pos])
+			return lmv->tgts[*pos];
+		++*pos;
+	}
+
+	return  NULL;
 }
 
 static int lmv_tgt_seq_show(struct seq_file *p, void *v)
@@ -213,7 +159,6 @@ const struct file_operations lmv_proc_target_fops = {
 static struct attribute *lmv_attrs[] = {
 	&lustre_attr_activeobd.attr,
 	&lustre_attr_numobd.attr,
-	&lustre_attr_placement.attr,
 	NULL,
 };
 
diff --git a/drivers/staging/lustre/lustre/lov/lov_io.c b/drivers/staging/lustre/lustre/lov/lov_io.c
index 002326c282a7..e0f0756ee883 100644
--- a/drivers/staging/lustre/lustre/lov/lov_io.c
+++ b/drivers/staging/lustre/lustre/lov/lov_io.c
@@ -1056,9 +1056,12 @@ int lov_io_init_released(const struct lu_env *env, struct cl_object *obj,
 		 * - in setattr, for truncate
 		 */
 		/* the truncate is for size > 0 so triggers a restore */
-		if (cl_io_is_trunc(io))
+		if (cl_io_is_trunc(io)) {
 			io->ci_restore_needed = 1;
-		result = -ENODATA;
+			result = -ENODATA;
+		} else {
+			result = 1;
+		}
 		break;
 	case CIT_READ:
 	case CIT_WRITE:
diff --git a/drivers/staging/lustre/lustre/lov/lov_lock.c b/drivers/staging/lustre/lustre/lov/lov_lock.c
index f3a0583f28f5..8502128e8248 100644
--- a/drivers/staging/lustre/lustre/lov/lov_lock.c
+++ b/drivers/staging/lustre/lustre/lov/lov_lock.c
@@ -134,6 +134,11 @@ static struct lov_lock *lov_lock_sub_init(const struct lu_env *env,
 	struct lov_layout_raid0 *r0     = lov_r0(loo);
 	struct lov_lock		*lovlck;
 
+	CDEBUG(D_INODE, "%p: lock/io FID " DFID "/" DFID ", lock/io clobj %p/%p\n",
+	       loo, PFID(lu_object_fid(lov2lu(loo))),
+	       PFID(lu_object_fid(&obj->co_lu)),
+	       lov2cl(loo), obj);
+
 	file_start = cl_offset(lov2cl(loo), lock->cll_descr.cld_start);
 	file_end   = cl_offset(lov2cl(loo), lock->cll_descr.cld_end + 1) - 1;
 
diff --git a/drivers/staging/lustre/lustre/lov/lov_obd.c b/drivers/staging/lustre/lustre/lov/lov_obd.c
index 63b064523c6a..b3161fb6d4b5 100644
--- a/drivers/staging/lustre/lustre/lov/lov_obd.c
+++ b/drivers/staging/lustre/lustre/lov/lov_obd.c
@@ -592,8 +592,6 @@ static int lov_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 	CDEBUG(D_CONFIG, "idx=%d ltd_gen=%d ld_tgt_count=%d\n",
 	       index, tgt->ltd_gen, lov->desc.ld_tgt_count);
 
-	rc = obd_notify(obd, tgt_obd, OBD_NOTIFY_CREATE, &index);
-
 	if (lov->lov_connects == 0) {
 		/* lov_connect hasn't been called yet. We'll do the
 		 * lov_connect_obd on this target when that fn first runs,
diff --git a/drivers/staging/lustre/lustre/lov/lov_object.c b/drivers/staging/lustre/lustre/lov/lov_object.c
index 76d4256fa828..977579c9c519 100644
--- a/drivers/staging/lustre/lustre/lov/lov_object.c
+++ b/drivers/staging/lustre/lustre/lov/lov_object.c
@@ -266,6 +266,13 @@ static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
 			if (result != 0)
 				goto out;
 
+			if (!dev->ld_target[ost_idx]) {
+				CERROR("%s: OST %04x is not initialized\n",
+				lov2obd(dev->ld_lov)->obd_name, ost_idx);
+				result = -EIO;
+				goto out;
+			}
+
 			subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
 			subconf->u.coc_oinfo = oinfo;
 			LASSERTF(subdev, "not init ost %d\n", ost_idx);
@@ -650,12 +657,16 @@ static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
 
 static inline void lov_conf_freeze(struct lov_object *lov)
 {
+	CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n",
+	       lov, lov->lo_owner, current);
 	if (lov->lo_owner != current)
 		down_read(&lov->lo_type_guard);
 }
 
 static inline void lov_conf_thaw(struct lov_object *lov)
 {
+	CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n",
+	       lov, lov->lo_owner, current);
 	if (lov->lo_owner != current)
 		up_read(&lov->lo_type_guard);
 }
@@ -698,10 +709,14 @@ static void lov_conf_lock(struct lov_object *lov)
 	down_write(&lov->lo_type_guard);
 	LASSERT(!lov->lo_owner);
 	lov->lo_owner = current;
+	CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n",
+	       lov, lov->lo_owner);
 }
 
 static void lov_conf_unlock(struct lov_object *lov)
 {
+	CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n",
+	       lov, lov->lo_owner);
 	lov->lo_owner = NULL;
 	up_write(&lov->lo_type_guard);
 }
@@ -725,6 +740,7 @@ static int lov_layout_change(const struct lu_env *unused,
 			     struct lov_object *lov, struct lov_stripe_md *lsm,
 			     const struct cl_object_conf *conf)
 {
+	struct lov_device *lov_dev = lov_object_dev(lov);
 	enum lov_layout_type llt = lov_type(lsm);
 	union lov_layout_state *state = &lov->u;
 	const struct lov_layout_operations *old_ops;
@@ -760,14 +776,21 @@ static int lov_layout_change(const struct lu_env *unused,
 
 	LASSERT(!atomic_read(&lov->lo_active_ios));
 
+	CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n",
+	       PFID(lu_object_fid(lov2lu(lov))), lov, llt);
+
 	lov->lo_type = LLT_EMPTY;
 
 	/* page bufsize fixup */
 	cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
 			lov_page_slice_fixup(lov, NULL);
 
-	rc = new_ops->llo_init(env, lov_object_dev(lov), lov, lsm, conf, state);
+	rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state);
 	if (rc) {
+		struct obd_device *obd = lov2obd(lov_dev->ld_lov);
+
+		CERROR("%s: cannot apply new layout on " DFID " : rc = %d\n",
+		       obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc);
 		new_ops->llo_delete(env, lov, state);
 		new_ops->llo_fini(env, lov, state);
 		/* this file becomes an EMPTY file. */
@@ -923,6 +946,11 @@ int lov_io_init(const struct lu_env *env, struct cl_object *obj,
 		struct cl_io *io)
 {
 	CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
+
+	CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n",
+	       PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type,
+	       io->ci_ignore_layout, io->ci_verify_layout);
+
 	return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
 				     !io->ci_ignore_layout, env, obj, io);
 }
@@ -1453,14 +1481,11 @@ static int lov_object_layout_get(const struct lu_env *env,
 	if (!lsm) {
 		cl->cl_size = 0;
 		cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
-		cl->cl_is_released = false;
-
 		return 0;
 	}
 
 	cl->cl_size = lov_mds_md_size(lsm->lsm_stripe_count, lsm->lsm_magic);
 	cl->cl_layout_gen = lsm->lsm_layout_gen;
-	cl->cl_is_released = lsm_is_released(lsm);
 
 	rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
 	lov_lsm_put(lsm);
diff --git a/drivers/staging/lustre/lustre/lov/lov_pack.c b/drivers/staging/lustre/lustre/lov/lov_pack.c
index 6c93d180aef7..2e1bd47337fd 100644
--- a/drivers/staging/lustre/lustre/lov/lov_pack.c
+++ b/drivers/staging/lustre/lustre/lov/lov_pack.c
@@ -136,7 +136,7 @@ ssize_t lov_lsm_pack(const struct lov_stripe_md *lsm, void *buf,
 	lmmv1->lmm_layout_gen = cpu_to_le16(lsm->lsm_layout_gen);
 
 	if (lsm->lsm_magic == LOV_MAGIC_V3) {
-		CLASSERT(sizeof(lsm->lsm_pool_name) ==
+		BUILD_BUG_ON(sizeof(lsm->lsm_pool_name) !=
 			 sizeof(lmmv3->lmm_pool_name));
 		strlcpy(lmmv3->lmm_pool_name, lsm->lsm_pool_name,
 			sizeof(lmmv3->lmm_pool_name));
@@ -198,7 +198,8 @@ static int lov_verify_lmm(void *lmm, int lmm_bytes, __u16 *stripe_count)
 	return rc;
 }
 
-struct lov_stripe_md *lov_lsm_alloc(u16 stripe_count, u32 pattern, u32 magic)
+static struct lov_stripe_md *lov_lsm_alloc(u16 stripe_count, u32 pattern,
+					   u32 magic)
 {
 	struct lov_stripe_md *lsm;
 	unsigned int i;
@@ -356,8 +357,8 @@ int lov_getstripe(struct lov_object *obj, struct lov_stripe_md *lsm,
 
 	/* FIXME: Bug 1185 - copy fields properly when structs change */
 	/* struct lov_user_md_v3 and struct lov_mds_md_v3 must be the same */
-	CLASSERT(sizeof(lum) == sizeof(struct lov_mds_md_v3));
-	CLASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lmmk->lmm_objects[0]));
+	BUILD_BUG_ON(sizeof(lum) != sizeof(struct lov_mds_md_v3));
+	BUILD_BUG_ON(sizeof(lum.lmm_objects[0]) != sizeof(lmmk->lmm_objects[0]));
 
 	if (cpu_to_le32(LOV_MAGIC) != LOV_MAGIC &&
 	    (lmmk->lmm_magic == cpu_to_le32(LOV_MAGIC_V1) ||
diff --git a/drivers/staging/lustre/lustre/lov/lov_request.c b/drivers/staging/lustre/lustre/lov/lov_request.c
index d43cc88ae641..3a747913fb4f 100644
--- a/drivers/staging/lustre/lustre/lov/lov_request.c
+++ b/drivers/staging/lustre/lustre/lov/lov_request.c
@@ -344,9 +344,6 @@ int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 			continue;
 		}
 
-		if (!lov->lov_tgts[i]->ltd_active)
-			lov_check_and_wait_active(lov, i);
-
 		/* skip targets that have been explicitly disabled by the
 		 * administrator
 		 */
@@ -355,6 +352,9 @@ int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
 			continue;
 		}
 
+		if (!lov->lov_tgts[i]->ltd_active)
+			lov_check_and_wait_active(lov, i);
+
 		req = kzalloc(sizeof(*req), GFP_NOFS);
 		if (!req) {
 			rc = -ENOMEM;
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_internal.h b/drivers/staging/lustre/lustre/mdc/mdc_internal.h
index 881c6a0676a6..fecedc8819ed 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_internal.h
+++ b/drivers/staging/lustre/lustre/mdc/mdc_internal.h
@@ -116,8 +116,7 @@ int mdc_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
 			struct lu_fid *fid, __u64 *bits);
 
 int mdc_intent_getattr_async(struct obd_export *exp,
-			     struct md_enqueue_info *minfo,
-			     struct ldlm_enqueue_info *einfo);
+			     struct md_enqueue_info *minfo);
 
 enum ldlm_mode mdc_lock_match(struct obd_export *exp, __u64 flags,
 			      const struct lu_fid *fid, enum ldlm_type type,
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_lib.c b/drivers/staging/lustre/lustre/mdc/mdc_lib.c
index f35e1f9afdef..b1853ff7f8b9 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_lib.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_lib.c
@@ -125,7 +125,7 @@ void mdc_create_pack(struct ptlrpc_request *req, struct md_op_data *op_data,
 	char			*tmp;
 	__u64			 flags;
 
-	CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_create));
+	BUILD_BUG_ON(sizeof(struct mdt_rec_reint) != sizeof(struct mdt_rec_create));
 	rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 
 	rec->cr_opcode   = REINT_CREATE;
@@ -189,7 +189,7 @@ void mdc_open_pack(struct ptlrpc_request *req, struct md_op_data *op_data,
 	char *tmp;
 	__u64 cr_flags;
 
-	CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_create));
+	BUILD_BUG_ON(sizeof(struct mdt_rec_reint) != sizeof(struct mdt_rec_create));
 	rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 
 	/* XXX do something about time, uid, gid */
@@ -313,7 +313,7 @@ void mdc_setattr_pack(struct ptlrpc_request *req, struct md_op_data *op_data,
 	struct mdt_rec_setattr *rec;
 	struct lov_user_md *lum = NULL;
 
-	CLASSERT(sizeof(struct mdt_rec_reint) ==
+	BUILD_BUG_ON(sizeof(struct mdt_rec_reint) !=
 					sizeof(struct mdt_rec_setattr));
 	rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 	mdc_setattr_pack_rec(rec, op_data);
@@ -336,7 +336,7 @@ void mdc_unlink_pack(struct ptlrpc_request *req, struct md_op_data *op_data)
 {
 	struct mdt_rec_unlink *rec;
 
-	CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_unlink));
+	BUILD_BUG_ON(sizeof(struct mdt_rec_reint) != sizeof(struct mdt_rec_unlink));
 	rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 
 	rec->ul_opcode   = op_data->op_cli_flags & CLI_RM_ENTRY ?
@@ -359,7 +359,7 @@ void mdc_link_pack(struct ptlrpc_request *req, struct md_op_data *op_data)
 {
 	struct mdt_rec_link *rec;
 
-	CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_link));
+	BUILD_BUG_ON(sizeof(struct mdt_rec_reint) != sizeof(struct mdt_rec_link));
 	rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 
 	rec->lk_opcode   = REINT_LINK;
@@ -407,7 +407,7 @@ void mdc_rename_pack(struct ptlrpc_request *req, struct md_op_data *op_data,
 {
 	struct mdt_rec_rename *rec;
 
-	CLASSERT(sizeof(struct mdt_rec_reint) == sizeof(struct mdt_rec_rename));
+	BUILD_BUG_ON(sizeof(struct mdt_rec_reint) != sizeof(struct mdt_rec_rename));
 	rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 
 	/* XXX do something about time, uid, gid */
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_locks.c b/drivers/staging/lustre/lustre/mdc/mdc_locks.c
index 54ebb9952d66..392b0e38a91e 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_locks.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_locks.c
@@ -49,7 +49,6 @@
 struct mdc_getattr_args {
 	struct obd_export	   *ga_exp;
 	struct md_enqueue_info      *ga_minfo;
-	struct ldlm_enqueue_info    *ga_einfo;
 };
 
 int it_open_error(int phase, struct lookup_intent *it)
@@ -722,7 +721,7 @@ int mdc_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
 		LASSERT(!policy);
 
 		saved_flags |= LDLM_FL_HAS_INTENT;
-		if (it->it_op & (IT_OPEN | IT_UNLINK | IT_GETATTR | IT_READDIR))
+		if (it->it_op & (IT_UNLINK | IT_GETATTR | IT_READDIR))
 			policy = &update_policy;
 		else if (it->it_op & IT_LAYOUT)
 			policy = &layout_policy;
@@ -1111,7 +1110,7 @@ static int mdc_intent_getattr_async_interpret(const struct lu_env *env,
 	struct mdc_getattr_args  *ga = args;
 	struct obd_export	*exp = ga->ga_exp;
 	struct md_enqueue_info   *minfo = ga->ga_minfo;
-	struct ldlm_enqueue_info *einfo = ga->ga_einfo;
+	struct ldlm_enqueue_info *einfo = &minfo->mi_einfo;
 	struct lookup_intent     *it;
 	struct lustre_handle     *lockh;
 	struct obd_device	*obddev;
@@ -1147,14 +1146,12 @@ static int mdc_intent_getattr_async_interpret(const struct lu_env *env,
 	rc = mdc_finish_intent_lock(exp, req, &minfo->mi_data, it, lockh);
 
 out:
-	kfree(einfo);
 	minfo->mi_cb(req, minfo, rc);
 	return 0;
 }
 
 int mdc_intent_getattr_async(struct obd_export *exp,
-			     struct md_enqueue_info *minfo,
-			     struct ldlm_enqueue_info *einfo)
+			     struct md_enqueue_info *minfo)
 {
 	struct md_op_data       *op_data = &minfo->mi_data;
 	struct lookup_intent    *it = &minfo->mi_it;
@@ -1162,10 +1159,6 @@ int mdc_intent_getattr_async(struct obd_export *exp,
 	struct mdc_getattr_args *ga;
 	struct obd_device       *obddev = class_exp2obd(exp);
 	struct ldlm_res_id       res_id;
-	/*XXX: Both MDS_INODELOCK_LOOKUP and MDS_INODELOCK_UPDATE are needed
-	 *     for statahead currently. Consider CMD in future, such two bits
-	 *     maybe managed by different MDS, should be adjusted then.
-	 */
 	union ldlm_policy_data policy = {
 		.l_inodebits = { MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE }
 	};
@@ -1188,19 +1181,18 @@ int mdc_intent_getattr_async(struct obd_export *exp,
 		return rc;
 	}
 
-	rc = ldlm_cli_enqueue(exp, &req, einfo, &res_id, &policy, &flags, NULL,
-			      0, LVB_T_NONE, &minfo->mi_lockh, 1);
+	rc = ldlm_cli_enqueue(exp, &req, &minfo->mi_einfo, &res_id, &policy,
+			      &flags, NULL, 0, LVB_T_NONE, &minfo->mi_lockh, 1);
 	if (rc < 0) {
 		obd_put_request_slot(&obddev->u.cli);
 		ptlrpc_req_finished(req);
 		return rc;
 	}
 
-	CLASSERT(sizeof(*ga) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*ga) > sizeof(req->rq_async_args));
 	ga = ptlrpc_req_async_args(req);
 	ga->ga_exp = exp;
 	ga->ga_minfo = minfo;
-	ga->ga_einfo = einfo;
 
 	req->rq_interpret_reply = mdc_intent_getattr_async_interpret;
 	ptlrpcd_add_req(req);
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c
index 2cfd913f9bc5..6bc2fb858680 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_request.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c
@@ -295,7 +295,7 @@ static int mdc_xattr_common(struct obd_export *exp,
 	if (opcode == MDS_REINT) {
 		struct mdt_rec_setxattr *rec;
 
-		CLASSERT(sizeof(struct mdt_rec_setxattr) ==
+		BUILD_BUG_ON(sizeof(struct mdt_rec_setxattr) !=
 			 sizeof(struct mdt_rec_reint));
 		rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 		rec->sx_opcode = REINT_SETXATTR;
@@ -762,6 +762,7 @@ static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
 	rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
 	if (rc) {
 		ptlrpc_request_free(req);
+		req = NULL;
 		goto out;
 	}
 
@@ -2465,13 +2466,6 @@ static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
 	LASSERT(imp->imp_obd == obd);
 
 	switch (event) {
-	case IMP_EVENT_DISCON: {
-#if 0
-		/* XXX Pass event up to OBDs stack. used only for FLD now */
-		rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DISCON, NULL);
-#endif
-		break;
-	}
 	case IMP_EVENT_INACTIVE: {
 		struct client_obd *cli = &obd->u.cli;
 		/*
@@ -2503,6 +2497,7 @@ static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
 	case IMP_EVENT_OCD:
 		rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
 		break;
+	case IMP_EVENT_DISCON:
 	case IMP_EVENT_DEACTIVATE:
 	case IMP_EVENT_ACTIVATE:
 		break;
diff --git a/drivers/staging/lustre/lustre/mgc/mgc_request.c b/drivers/staging/lustre/lustre/mgc/mgc_request.c
index b9c522a3c7a4..6a76605b3c3d 100644
--- a/drivers/staging/lustre/lustre/mgc/mgc_request.c
+++ b/drivers/staging/lustre/lustre/mgc/mgc_request.c
@@ -142,10 +142,10 @@ static void config_log_put(struct config_llog_data *cld)
 
 		if (cld->cld_recover)
 			config_log_put(cld->cld_recover);
-		if (cld->cld_sptlrpc)
-			config_log_put(cld->cld_sptlrpc);
 		if (cld->cld_params)
 			config_log_put(cld->cld_params);
+		if (cld->cld_sptlrpc)
+			config_log_put(cld->cld_sptlrpc);
 		if (cld_is_sptlrpc(cld))
 			sptlrpc_conf_log_stop(cld->cld_logname);
 
@@ -175,13 +175,10 @@ struct config_llog_data *config_log_find(char *logname,
 		/* instance may be NULL, should check name */
 		if (strcmp(logname, cld->cld_logname) == 0) {
 			found = cld;
+			config_log_get(found);
 			break;
 		}
 	}
-	if (found) {
-		atomic_inc(&found->cld_refcount);
-		LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
-	}
 	spin_unlock(&config_list_lock);
 	return found;
 }
@@ -203,6 +200,12 @@ struct config_llog_data *do_config_log_add(struct obd_device *obd,
 	if (!cld)
 		return ERR_PTR(-ENOMEM);
 
+	rc = mgc_logname2resid(logname, &cld->cld_resid, type);
+	if (rc) {
+		kfree(cld);
+		return ERR_PTR(rc);
+	}
+
 	strcpy(cld->cld_logname, logname);
 	if (cfg)
 		cld->cld_cfg = *cfg;
@@ -223,17 +226,10 @@ struct config_llog_data *do_config_log_add(struct obd_device *obd,
 		cld->cld_cfg.cfg_obdname = obd->obd_name;
 	}
 
-	rc = mgc_logname2resid(logname, &cld->cld_resid, type);
-
 	spin_lock(&config_list_lock);
 	list_add(&cld->cld_list_chain, &config_llog_list);
 	spin_unlock(&config_list_lock);
 
-	if (rc) {
-		config_log_put(cld);
-		return ERR_PTR(rc);
-	}
-
 	if (cld_is_sptlrpc(cld)) {
 		rc = mgc_process_log(obd, cld);
 		if (rc && rc != -ENOENT)
@@ -284,14 +280,15 @@ config_params_log_add(struct obd_device *obd,
  * We have one active log per "mount" - client instance or servername.
  * Each instance may be at a different point in the log.
  */
-static int config_log_add(struct obd_device *obd, char *logname,
-			  struct config_llog_instance *cfg,
-			  struct super_block *sb)
+static struct config_llog_data *
+config_log_add(struct obd_device *obd, char *logname,
+	       struct config_llog_instance *cfg, struct super_block *sb)
 {
 	struct lustre_sb_info *lsi = s2lsi(sb);
 	struct config_llog_data *cld;
 	struct config_llog_data *sptlrpc_cld;
 	struct config_llog_data *params_cld;
+	bool locked = false;
 	char			seclogname[32];
 	char			*ptr;
 	int			rc;
@@ -305,7 +302,7 @@ static int config_log_add(struct obd_device *obd, char *logname,
 	ptr = strrchr(logname, '-');
 	if (!ptr || ptr - logname > 8) {
 		CERROR("logname %s is too long\n", logname);
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 	}
 
 	memcpy(seclogname, logname, ptr - logname);
@@ -326,14 +323,14 @@ static int config_log_add(struct obd_device *obd, char *logname,
 		rc = PTR_ERR(params_cld);
 		CERROR("%s: can't create params log: rc = %d\n",
 		       obd->obd_name, rc);
-		goto out_err1;
+		goto out_sptlrpc;
 	}
 
 	cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
 	if (IS_ERR(cld)) {
 		CERROR("can't create log: %s\n", logname);
 		rc = PTR_ERR(cld);
-		goto out_err2;
+		goto out_params;
 	}
 
 	cld->cld_sptlrpc = sptlrpc_cld;
@@ -350,33 +347,52 @@ static int config_log_add(struct obd_device *obd, char *logname,
 			CERROR("%s: sptlrpc log name not correct, %s: rc = %d\n",
 			       obd->obd_name, seclogname, -EINVAL);
 			config_log_put(cld);
-			return -EINVAL;
+			rc = -EINVAL;
+			goto out_cld;
 		}
 		recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 		if (IS_ERR(recover_cld)) {
 			rc = PTR_ERR(recover_cld);
-			goto out_err3;
+			goto out_cld;
 		}
+
+		mutex_lock(&cld->cld_lock);
+		locked = true;
 		cld->cld_recover = recover_cld;
 	}
 
-	return 0;
+	if (!locked)
+		mutex_lock(&cld->cld_lock);
+	cld->cld_params = params_cld;
+	cld->cld_sptlrpc = sptlrpc_cld;
+	mutex_unlock(&cld->cld_lock);
+
+	return cld;
 
-out_err3:
+out_cld:
 	config_log_put(cld);
 
-out_err2:
+out_params:
 	config_log_put(params_cld);
 
-out_err1:
+out_sptlrpc:
 	config_log_put(sptlrpc_cld);
 
 out_err:
-	return rc;
+	return ERR_PTR(rc);
 }
 
 static DEFINE_MUTEX(llog_process_lock);
 
+static inline void config_mark_cld_stop(struct config_llog_data *cld)
+{
+	mutex_lock(&cld->cld_lock);
+	spin_lock(&config_list_lock);
+	cld->cld_stopping = 1;
+	spin_unlock(&config_list_lock);
+	mutex_unlock(&cld->cld_lock);
+}
+
 /** Stop watching for updates on this log.
  */
 static int config_log_end(char *logname, struct config_llog_instance *cfg)
@@ -406,36 +422,32 @@ static int config_log_end(char *logname, struct config_llog_instance *cfg)
 		return rc;
 	}
 
+	spin_lock(&config_list_lock);
 	cld->cld_stopping = 1;
+	spin_unlock(&config_list_lock);
 
 	cld_recover = cld->cld_recover;
 	cld->cld_recover = NULL;
+
+	cld_params = cld->cld_params;
+	cld->cld_params = NULL;
+	cld_sptlrpc = cld->cld_sptlrpc;
+	cld->cld_sptlrpc = NULL;
 	mutex_unlock(&cld->cld_lock);
 
 	if (cld_recover) {
-		mutex_lock(&cld_recover->cld_lock);
-		cld_recover->cld_stopping = 1;
-		mutex_unlock(&cld_recover->cld_lock);
+		config_mark_cld_stop(cld_recover);
 		config_log_put(cld_recover);
 	}
 
-	spin_lock(&config_list_lock);
-	cld_sptlrpc = cld->cld_sptlrpc;
-	cld->cld_sptlrpc = NULL;
-	cld_params = cld->cld_params;
-	cld->cld_params = NULL;
-	spin_unlock(&config_list_lock);
-
-	if (cld_sptlrpc)
-		config_log_put(cld_sptlrpc);
-
 	if (cld_params) {
-		mutex_lock(&cld_params->cld_lock);
-		cld_params->cld_stopping = 1;
-		mutex_unlock(&cld_params->cld_lock);
+		config_mark_cld_stop(cld_params);
 		config_log_put(cld_params);
 	}
 
+	if (cld_sptlrpc)
+		config_log_put(cld_sptlrpc);
+
 	/* drop the ref from the find */
 	config_log_put(cld);
 	/* drop the start ref */
@@ -531,11 +543,10 @@ static int mgc_requeue_thread(void *data)
 	/* Keep trying failed locks periodically */
 	spin_lock(&config_list_lock);
 	rq_state |= RQ_RUNNING;
-	while (1) {
+	while (!(rq_state & RQ_STOP)) {
 		struct l_wait_info lwi;
 		struct config_llog_data *cld, *cld_prev;
 		int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
-		int stopped = !!(rq_state & RQ_STOP);
 		int to;
 
 		/* Any new or requeued lostlocks will change the state */
@@ -571,44 +582,40 @@ static int mgc_requeue_thread(void *data)
 		spin_lock(&config_list_lock);
 		rq_state &= ~RQ_PRECLEANUP;
 		list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
-			if (!cld->cld_lostlock)
+			if (!cld->cld_lostlock || cld->cld_stopping)
 				continue;
 
+			/*
+			 * hold reference to avoid being freed during
+			 * subsequent processing.
+			 */
+			config_log_get(cld);
+			cld->cld_lostlock = 0;
 			spin_unlock(&config_list_lock);
 
-			LASSERT(atomic_read(&cld->cld_refcount) > 0);
-
-			/* Whether we enqueued again or not in mgc_process_log,
-			 * we're done with the ref from the old enqueue
-			 */
 			if (cld_prev)
 				config_log_put(cld_prev);
 			cld_prev = cld;
 
-			cld->cld_lostlock = 0;
-			if (likely(!stopped))
+			if (likely(!(rq_state & RQ_STOP))) {
 				do_requeue(cld);
-
-			spin_lock(&config_list_lock);
+				spin_lock(&config_list_lock);
+			} else {
+				spin_lock(&config_list_lock);
+				break;
+			}
 		}
 		spin_unlock(&config_list_lock);
 		if (cld_prev)
 			config_log_put(cld_prev);
 
-		/* break after scanning the list so that we can drop
-		 * refcount to losing lock clds
-		 */
-		if (unlikely(stopped)) {
-			spin_lock(&config_list_lock);
-			break;
-		}
-
 		/* Wait a bit to see if anyone else needs a requeue */
 		lwi = (struct l_wait_info) { 0 };
 		l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
 			     &lwi);
 		spin_lock(&config_list_lock);
 	}
+
 	/* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 	rq_state &= ~RQ_RUNNING;
 	spin_unlock(&config_list_lock);
@@ -624,32 +631,24 @@ static int mgc_requeue_thread(void *data)
  */
 static void mgc_requeue_add(struct config_llog_data *cld)
 {
+	bool wakeup = false;
+
 	CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 	       cld->cld_logname, atomic_read(&cld->cld_refcount),
 	       cld->cld_stopping, rq_state);
 	LASSERT(atomic_read(&cld->cld_refcount) > 0);
 
 	mutex_lock(&cld->cld_lock);
-	if (cld->cld_stopping || cld->cld_lostlock) {
-		mutex_unlock(&cld->cld_lock);
-		return;
-	}
-	/* this refcount will be released in mgc_requeue_thread. */
-	config_log_get(cld);
-	cld->cld_lostlock = 1;
-	mutex_unlock(&cld->cld_lock);
-
-	/* Hold lock for rq_state */
 	spin_lock(&config_list_lock);
-	if (rq_state & RQ_STOP) {
-		spin_unlock(&config_list_lock);
-		cld->cld_lostlock = 0;
-		config_log_put(cld);
-	} else {
+	if (!(rq_state & RQ_STOP) && !cld->cld_stopping && !cld->cld_lostlock) {
+		cld->cld_lostlock = 1;
 		rq_state |= RQ_NOW;
-		spin_unlock(&config_list_lock);
-		wake_up(&rq_waitq);
+		wakeup = true;
 	}
+	spin_unlock(&config_list_lock);
+	mutex_unlock(&cld->cld_lock);
+	if (wakeup)
+		wake_up(&rq_waitq);
 }
 
 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
@@ -812,6 +811,8 @@ static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 
 		/* held at mgc_process_log(). */
 		LASSERT(atomic_read(&cld->cld_refcount) > 0);
+
+		lock->l_ast_data = NULL;
 		/* Are we done with this log? */
 		if (cld->cld_stopping) {
 			CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
@@ -1661,16 +1662,18 @@ restart:
 				goto restart;
 			} else {
 				mutex_lock(&cld->cld_lock);
+				spin_lock(&config_list_lock);
 				cld->cld_lostlock = 1;
+				spin_unlock(&config_list_lock);
 			}
 		} else {
 			/* mark cld_lostlock so that it will requeue
 			 * after MGC becomes available.
 			 */
+			spin_lock(&config_list_lock);
 			cld->cld_lostlock = 1;
+			spin_unlock(&config_list_lock);
 		}
-		/* Get extra reference, it will be put in requeue thread */
-		config_log_get(cld);
 	}
 
 	if (cld_is_recover(cld)) {
@@ -1681,7 +1684,9 @@ restart:
 				CERROR("%s: recover log %s failed: rc = %d not fatal.\n",
 				       mgc->obd_name, cld->cld_logname, rc);
 				rc = 0;
+				spin_lock(&config_list_lock);
 				cld->cld_lostlock = 1;
+				spin_unlock(&config_list_lock);
 			}
 		}
 	} else {
@@ -1749,12 +1754,9 @@ static int mgc_process_config(struct obd_device *obd, u32 len, void *buf)
 		       cfg->cfg_last_idx);
 
 		/* We're only called through here on the initial mount */
-		rc = config_log_add(obd, logname, cfg, sb);
-		if (rc)
-			break;
-		cld = config_log_find(logname, cfg);
-		if (!cld) {
-			rc = -ENOENT;
+		cld = config_log_add(obd, logname, cfg, sb);
+		if (IS_ERR(cld)) {
+			rc = PTR_ERR(cld);
 			break;
 		}
 
@@ -1770,11 +1772,15 @@ static int mgc_process_config(struct obd_device *obd, u32 len, void *buf)
 					 imp_connect_data, IMP_RECOV)) {
 				rc = mgc_process_log(obd, cld->cld_recover);
 			} else {
-				struct config_llog_data *cir = cld->cld_recover;
+				struct config_llog_data *cir;
 
+				mutex_lock(&cld->cld_lock);
+				cir = cld->cld_recover;
 				cld->cld_recover = NULL;
+				mutex_unlock(&cld->cld_lock);
 				config_log_put(cir);
 			}
+
 			if (rc)
 				CERROR("Cannot process recover llog %d\n", rc);
 		}
@@ -1792,7 +1798,6 @@ static int mgc_process_config(struct obd_device *obd, u32 len, void *buf)
 				       "%s: can't process params llog: rc = %d\n",
 				       obd->obd_name, rc);
 		}
-		config_log_put(cld);
 
 		break;
 	}
diff --git a/drivers/staging/lustre/lustre/obdclass/cl_io.c b/drivers/staging/lustre/lustre/obdclass/cl_io.c
index 3f42457b0d7d..ee7d67761191 100644
--- a/drivers/staging/lustre/lustre/obdclass/cl_io.c
+++ b/drivers/staging/lustre/lustre/obdclass/cl_io.c
@@ -1119,9 +1119,9 @@ int cl_sync_io_wait(const struct lu_env *env, struct cl_sync_io *anchor,
 	LASSERT(atomic_read(&anchor->csi_sync_nr) == 0);
 
 	/* wait until cl_sync_io_note() has done wakeup */
-	while (unlikely(atomic_read(&anchor->csi_barrier) != 0)) {
+	while (unlikely(atomic_read(&anchor->csi_barrier) != 0))
 		cpu_relax();
-	}
+
 
 	return rc;
 }
diff --git a/drivers/staging/lustre/lustre/obdclass/cl_object.c b/drivers/staging/lustre/lustre/obdclass/cl_object.c
index f5d4e23c64b7..703cb67ce42e 100644
--- a/drivers/staging/lustre/lustre/obdclass/cl_object.c
+++ b/drivers/staging/lustre/lustre/obdclass/cl_object.c
@@ -54,6 +54,7 @@
 #include <linux/list.h>
 #include "../../include/linux/libcfs/libcfs_hash.h"	/* for cfs_hash stuff */
 #include "../include/cl_object.h"
+#include "../include/lu_object.h"
 #include "cl_internal.h"
 
 static struct kmem_cache *cl_env_kmem;
@@ -61,8 +62,6 @@ static struct kmem_cache *cl_env_kmem;
 /** Lock class of cl_object_header::coh_attr_guard */
 static struct lock_class_key cl_attr_guard_class;
 
-extern __u32 lu_context_tags_default;
-extern __u32 lu_session_tags_default;
 /**
  * Initialize cl_object_header.
  */
diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c
index 7971562a3efd..abcf951208d2 100644
--- a/drivers/staging/lustre/lustre/obdclass/lu_object.c
+++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c
@@ -60,7 +60,7 @@ enum {
 	LU_CACHE_PERCENT_DEFAULT = 20
 };
 
-#define LU_CACHE_NR_MAX_ADJUST		128
+#define LU_CACHE_NR_MAX_ADJUST		512
 #define LU_CACHE_NR_UNLIMITED		-1
 #define LU_CACHE_NR_DEFAULT		LU_CACHE_NR_UNLIMITED
 #define LU_CACHE_NR_LDISKFS_LIMIT	LU_CACHE_NR_UNLIMITED
@@ -151,7 +151,7 @@ void lu_object_put(const struct lu_env *env, struct lu_object *o)
 		LASSERT(list_empty(&top->loh_lru));
 		list_add_tail(&top->loh_lru, &bkt->lsb_lru);
 		bkt->lsb_lru_len++;
-		lprocfs_counter_incr(site->ls_stats, LU_SS_LRU_LEN);
+		percpu_counter_inc(&site->ls_lru_len_counter);
 		CDEBUG(D_INODE, "Add %p to site lru. hash: %p, bkt: %p, lru_len: %ld\n",
 		       o, site->ls_obj_hash, bkt, bkt->lsb_lru_len);
 		cfs_hash_bd_unlock(site->ls_obj_hash, &bd, 1);
@@ -202,7 +202,7 @@ void lu_object_unhash(const struct lu_env *env, struct lu_object *o)
 			list_del_init(&top->loh_lru);
 			bkt = cfs_hash_bd_extra_get(obj_hash, &bd);
 			bkt->lsb_lru_len--;
-			lprocfs_counter_decr(site->ls_stats, LU_SS_LRU_LEN);
+			percpu_counter_dec(&site->ls_lru_len_counter);
 		}
 		cfs_hash_bd_del_locked(obj_hash, &bd, &top->loh_hash);
 		cfs_hash_bd_unlock(obj_hash, &bd, 1);
@@ -329,8 +329,11 @@ static void lu_object_free(const struct lu_env *env, struct lu_object *o)
 
 /**
  * Free \a nr objects from the cold end of the site LRU list.
+ * if canblock is false, then don't block awaiting for another
+ * instance of lu_site_purge() to complete
  */
-int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
+int lu_site_purge_objects(const struct lu_env *env, struct lu_site *s,
+			  int nr, bool canblock)
 {
 	struct lu_object_header *h;
 	struct lu_object_header *temp;
@@ -360,7 +363,11 @@ int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
 	 * It doesn't make any sense to make purge threads parallel, that can
 	 * only bring troubles to us. See LU-5331.
 	 */
-	mutex_lock(&s->ls_purge_mutex);
+	if (canblock)
+		mutex_lock(&s->ls_purge_mutex);
+	else if (!mutex_trylock(&s->ls_purge_mutex))
+		goto out;
+
 	did_sth = 0;
 	cfs_hash_for_each_bucket(s->ls_obj_hash, &bd, i) {
 		if (i < start)
@@ -379,7 +386,7 @@ int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
 					       &bd2, &h->loh_hash);
 			list_move(&h->loh_lru, &dispose);
 			bkt->lsb_lru_len--;
-			lprocfs_counter_decr(s->ls_stats, LU_SS_LRU_LEN);
+			percpu_counter_dec(&s->ls_lru_len_counter);
 			if (did_sth == 0)
 				did_sth = 1;
 
@@ -414,10 +421,10 @@ int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
 	}
 	/* race on s->ls_purge_start, but nobody cares */
 	s->ls_purge_start = i % CFS_HASH_NBKT(s->ls_obj_hash);
-
+out:
 	return nr;
 }
-EXPORT_SYMBOL(lu_site_purge);
+EXPORT_SYMBOL(lu_site_purge_objects);
 
 /*
  * Object printing.
@@ -578,7 +585,7 @@ static struct lu_object *htable_lookup(struct lu_site *s,
 		if (!list_empty(&h->loh_lru)) {
 			list_del_init(&h->loh_lru);
 			bkt->lsb_lru_len--;
-			lprocfs_counter_decr(s->ls_stats, LU_SS_LRU_LEN);
+			percpu_counter_dec(&s->ls_lru_len_counter);
 		}
 		return lu_object_top(h);
 	}
@@ -625,9 +632,12 @@ static void lu_object_limit(const struct lu_env *env, struct lu_device *dev)
 
 	size = cfs_hash_size_get(dev->ld_site->ls_obj_hash);
 	nr = (__u64)lu_cache_nr;
-	if (size > nr)
-		lu_site_purge(env, dev->ld_site,
-			      min_t(__u64, size - nr, LU_CACHE_NR_MAX_ADJUST));
+	if (size <= nr)
+		return;
+
+	lu_site_purge_objects(env, dev->ld_site,
+			      min_t(__u64, size - nr, LU_CACHE_NR_MAX_ADJUST),
+			      false);
 }
 
 static struct lu_object *lu_object_new(const struct lu_env *env,
@@ -820,7 +830,7 @@ EXPORT_SYMBOL(lu_device_type_fini);
  * Global list of all sites on this node
  */
 static LIST_HEAD(lu_sites);
-static DEFINE_MUTEX(lu_sites_guard);
+static DECLARE_RWSEM(lu_sites_guard);
 
 /**
  * Global environment used by site shrinker.
@@ -994,9 +1004,15 @@ int lu_site_init(struct lu_site *s, struct lu_device *top)
 	unsigned long bits;
 	unsigned long i;
 	char name[16];
+	int rc;
 
 	memset(s, 0, sizeof(*s));
 	mutex_init(&s->ls_purge_mutex);
+
+	rc = percpu_counter_init(&s->ls_lru_len_counter, 0, GFP_NOFS);
+	if (rc)
+		return -ENOMEM;
+
 	snprintf(name, sizeof(name), "lu_site_%s", top->ld_type->ldt_name);
 	for (bits = lu_htable_order(top); bits >= LU_SITE_BITS_MIN; bits--) {
 		s->ls_obj_hash = cfs_hash_create(name, bits, bits,
@@ -1042,12 +1058,6 @@ int lu_site_init(struct lu_site *s, struct lu_device *top)
 			     0, "cache_death_race", "cache_death_race");
 	lprocfs_counter_init(s->ls_stats, LU_SS_LRU_PURGED,
 			     0, "lru_purged", "lru_purged");
-	/*
-	 * Unlike other counters, lru_len can be decremented so
-	 * need lc_sum instead of just lc_count
-	 */
-	lprocfs_counter_init(s->ls_stats, LU_SS_LRU_LEN,
-			     LPROCFS_CNTR_AVGMINMAX, "lru_len", "lru_len");
 
 	INIT_LIST_HEAD(&s->ls_linkage);
 	s->ls_top_dev = top;
@@ -1069,9 +1079,11 @@ EXPORT_SYMBOL(lu_site_init);
  */
 void lu_site_fini(struct lu_site *s)
 {
-	mutex_lock(&lu_sites_guard);
+	down_write(&lu_sites_guard);
 	list_del_init(&s->ls_linkage);
-	mutex_unlock(&lu_sites_guard);
+	up_write(&lu_sites_guard);
+
+	percpu_counter_destroy(&s->ls_lru_len_counter);
 
 	if (s->ls_obj_hash) {
 		cfs_hash_putref(s->ls_obj_hash);
@@ -1097,11 +1109,11 @@ int lu_site_init_finish(struct lu_site *s)
 {
 	int result;
 
-	mutex_lock(&lu_sites_guard);
+	down_write(&lu_sites_guard);
 	result = lu_context_refill(&lu_shrink_env.le_ctx);
 	if (result == 0)
 		list_add(&s->ls_linkage, &lu_sites);
-	mutex_unlock(&lu_sites_guard);
+	up_write(&lu_sites_guard);
 	return result;
 }
 EXPORT_SYMBOL(lu_site_init_finish);
@@ -1820,12 +1832,15 @@ static void lu_site_stats_get(struct cfs_hash *hs,
 }
 
 /*
- * lu_cache_shrink_count returns the number of cached objects that are
- * candidates to be freed by shrink_slab(). A counter, which tracks
- * the number of items in the site's lru, is maintained in the per cpu
- * stats of each site. The counter is incremented when an object is added
- * to a site's lru and decremented when one is removed. The number of
- * free-able objects is the sum of all per cpu counters for all sites.
+ * lu_cache_shrink_count() returns an approximate number of cached objects
+ * that can be freed by shrink_slab(). A counter, which tracks the
+ * number of items in the site's lru, is maintained in a percpu_counter
+ * for each site. The percpu values are incremented and decremented as
+ * objects are added or removed from the lru. The percpu values are summed
+ * and saved whenever a percpu value exceeds a threshold. Thus the saved,
+ * summed value at any given time may not accurately reflect the current
+ * lru length. But this value is sufficiently accurate for the needs of
+ * a shrinker.
  *
  * Using a per cpu counter is a compromise solution to concurrent access:
  * lu_object_put() can update the counter without locking the site and
@@ -1842,11 +1857,10 @@ static unsigned long lu_cache_shrink_count(struct shrinker *sk,
 	if (!(sc->gfp_mask & __GFP_FS))
 		return 0;
 
-	mutex_lock(&lu_sites_guard);
-	list_for_each_entry_safe(s, tmp, &lu_sites, ls_linkage) {
-		cached += ls_stats_read(s->ls_stats, LU_SS_LRU_LEN);
-	}
-	mutex_unlock(&lu_sites_guard);
+	down_read(&lu_sites_guard);
+	list_for_each_entry_safe(s, tmp, &lu_sites, ls_linkage)
+		cached += percpu_counter_read_positive(&s->ls_lru_len_counter);
+	up_read(&lu_sites_guard);
 
 	cached = (cached / 100) * sysctl_vfs_cache_pressure;
 	CDEBUG(D_INODE, "%ld objects cached, cache pressure %d\n",
@@ -1877,7 +1891,7 @@ static unsigned long lu_cache_shrink_scan(struct shrinker *sk,
 		 */
 		return SHRINK_STOP;
 
-	mutex_lock(&lu_sites_guard);
+	down_write(&lu_sites_guard);
 	list_for_each_entry_safe(s, tmp, &lu_sites, ls_linkage) {
 		freed = lu_site_purge(&lu_shrink_env, s, remain);
 		remain -= freed;
@@ -1888,7 +1902,7 @@ static unsigned long lu_cache_shrink_scan(struct shrinker *sk,
 		list_move_tail(&s->ls_linkage, &splice);
 	}
 	list_splice(&splice, lu_sites.prev);
-	mutex_unlock(&lu_sites_guard);
+	up_write(&lu_sites_guard);
 
 	return sc->nr_to_scan - remain;
 }
@@ -1925,9 +1939,9 @@ int lu_global_init(void)
 	 * conservatively. This should not be too bad, because this
 	 * environment is global.
 	 */
-	mutex_lock(&lu_sites_guard);
+	down_write(&lu_sites_guard);
 	result = lu_env_init(&lu_shrink_env, LCT_SHRINKER);
-	mutex_unlock(&lu_sites_guard);
+	up_write(&lu_sites_guard);
 	if (result != 0)
 		return result;
 
@@ -1953,9 +1967,9 @@ void lu_global_fini(void)
 	 * Tear shrinker environment down _after_ de-registering
 	 * lu_global_key, because the latter has a value in the former.
 	 */
-	mutex_lock(&lu_sites_guard);
+	down_write(&lu_sites_guard);
 	lu_env_fini(&lu_shrink_env);
-	mutex_unlock(&lu_sites_guard);
+	up_write(&lu_sites_guard);
 
 	lu_ref_global_fini();
 }
@@ -1965,13 +1979,6 @@ static __u32 ls_stats_read(struct lprocfs_stats *stats, int idx)
 	struct lprocfs_counter ret;
 
 	lprocfs_stats_collect(stats, idx, &ret);
-	if (idx == LU_SS_LRU_LEN)
-		/*
-		 * protect against counter on cpu A being decremented
-		 * before counter is incremented on cpu B; unlikely
-		 */
-		return (__u32)((ret.lc_sum > 0) ? ret.lc_sum : 0);
-
 	return (__u32)ret.lc_count;
 }
 
@@ -1986,7 +1993,7 @@ int lu_site_stats_print(const struct lu_site *s, struct seq_file *m)
 	memset(&stats, 0, sizeof(stats));
 	lu_site_stats_get(s->ls_obj_hash, &stats, 1);
 
-	seq_printf(m, "%d/%d %d/%ld %d %d %d %d %d %d %d %d\n",
+	seq_printf(m, "%d/%d %d/%ld %d %d %d %d %d %d %d\n",
 		   stats.lss_busy,
 		   stats.lss_total,
 		   stats.lss_populated,
@@ -1997,8 +2004,7 @@ int lu_site_stats_print(const struct lu_site *s, struct seq_file *m)
 		   ls_stats_read(s->ls_stats, LU_SS_CACHE_MISS),
 		   ls_stats_read(s->ls_stats, LU_SS_CACHE_RACE),
 		   ls_stats_read(s->ls_stats, LU_SS_CACHE_DEATH_RACE),
-		   ls_stats_read(s->ls_stats, LU_SS_LRU_PURGED),
-		   ls_stats_read(s->ls_stats, LU_SS_LRU_LEN));
+		   ls_stats_read(s->ls_stats, LU_SS_LRU_PURGED));
 	return 0;
 }
 EXPORT_SYMBOL(lu_site_stats_print);
diff --git a/drivers/staging/lustre/lustre/obdclass/obd_mount.c b/drivers/staging/lustre/lustre/obdclass/obd_mount.c
index 2283e920d839..8e0d4b1d86dc 100644
--- a/drivers/staging/lustre/lustre/obdclass/obd_mount.c
+++ b/drivers/staging/lustre/lustre/obdclass/obd_mount.c
@@ -877,7 +877,7 @@ static int lmd_parse_mgs(struct lustre_mount_data *lmd, char **ptr)
  */
 static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 {
-	char *s1, *s2, *s3, *devname = NULL;
+	char *s1, *s2, *devname = NULL;
 	struct lustre_mount_data *raw = (struct lustre_mount_data *)options;
 	int rc = 0;
 
@@ -906,6 +906,7 @@ static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 	while (*s1) {
 		int clear = 0;
 		int time_min = OBD_RECOVERY_TIME_MIN;
+		char *s3;
 
 		/* Skip whitespace and extra commas */
 		while (*s1 == ' ' || *s1 == ',')
diff --git a/drivers/staging/lustre/lustre/obdclass/obdo.c b/drivers/staging/lustre/lustre/obdclass/obdo.c
index c52b9e07d7dd..b1dfa1622ae7 100644
--- a/drivers/staging/lustre/lustre/obdclass/obdo.c
+++ b/drivers/staging/lustre/lustre/obdclass/obdo.c
@@ -40,6 +40,7 @@
 
 #include "../include/obd_class.h"
 #include "../include/lustre/lustre_idl.h"
+#include "../include/lustre_obdo.h"
 
 void obdo_set_parent_fid(struct obdo *dst, const struct lu_fid *parent)
 {
@@ -124,3 +125,56 @@ void obdo_to_ioobj(const struct obdo *oa, struct obd_ioobj *ioobj)
 	ioobj->ioo_max_brw = 0;
 }
 EXPORT_SYMBOL(obdo_to_ioobj);
+
+/**
+ * Create an obdo to send over the wire
+ */
+void lustre_set_wire_obdo(const struct obd_connect_data *ocd,
+			  struct obdo *wobdo, const struct obdo *lobdo)
+{
+	*wobdo = *lobdo;
+	wobdo->o_flags &= ~OBD_FL_LOCAL_MASK;
+	if (!ocd)
+		return;
+
+	if (unlikely(!(ocd->ocd_connect_flags & OBD_CONNECT_FID)) &&
+	    fid_seq_is_echo(ostid_seq(&lobdo->o_oi))) {
+		/*
+		 * Currently OBD_FL_OSTID will only be used when 2.4 echo
+		 * client communicate with pre-2.4 server
+		 */
+		wobdo->o_oi.oi.oi_id = fid_oid(&lobdo->o_oi.oi_fid);
+		wobdo->o_oi.oi.oi_seq = fid_seq(&lobdo->o_oi.oi_fid);
+	}
+}
+EXPORT_SYMBOL(lustre_set_wire_obdo);
+
+/**
+ * Create a local obdo from a wire based odbo
+ */
+void lustre_get_wire_obdo(const struct obd_connect_data *ocd,
+			  struct obdo *lobdo, const struct obdo *wobdo)
+{
+	u32 local_flags = 0;
+
+	if (lobdo->o_valid & OBD_MD_FLFLAGS)
+		local_flags = lobdo->o_flags & OBD_FL_LOCAL_MASK;
+
+	*lobdo = *wobdo;
+	if (local_flags) {
+		lobdo->o_valid |= OBD_MD_FLFLAGS;
+		lobdo->o_flags &= ~OBD_FL_LOCAL_MASK;
+		lobdo->o_flags |= local_flags;
+	}
+	if (!ocd)
+		return;
+
+	if (unlikely(!(ocd->ocd_connect_flags & OBD_CONNECT_FID)) &&
+	    fid_seq_is_echo(wobdo->o_oi.oi.oi_seq)) {
+		/* see above */
+		lobdo->o_oi.oi_fid.f_seq = wobdo->o_oi.oi.oi_seq;
+		lobdo->o_oi.oi_fid.f_oid = wobdo->o_oi.oi.oi_id;
+		lobdo->o_oi.oi_fid.f_ver = 0;
+	}
+}
+EXPORT_SYMBOL(lustre_get_wire_obdo);
diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index b0f030c6c9c9..0490478393df 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -142,10 +142,7 @@ static const char *oes_strings[] = {
 
 static inline struct osc_extent *rb_extent(struct rb_node *n)
 {
-	if (!n)
-		return NULL;
-
-	return container_of(n, struct osc_extent, oe_node);
+	return rb_entry_safe(n, struct osc_extent, oe_node);
 }
 
 static inline struct osc_extent *next_extent(struct osc_extent *ext)
@@ -247,7 +244,7 @@ static int osc_extent_sanity_check0(struct osc_extent *ext,
 		goto out;
 	}
 
-	if (ext->oe_dlmlock) {
+	if (ext->oe_dlmlock && !ldlm_is_failed(ext->oe_dlmlock)) {
 		struct ldlm_extent *extent;
 
 		extent = &ext->oe_dlmlock->l_policy_data.l_extent;
@@ -1004,6 +1001,7 @@ static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
 	env = cl_env_get(&refcheck);
 	io  = &osc_env_info(env)->oti_io;
 	io->ci_obj = cl_object_top(osc2cl(obj));
+	io->ci_ignore_layout = 1;
 	rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
 	if (rc < 0)
 		goto out;
@@ -1884,16 +1882,32 @@ static void osc_ap_completion(const struct lu_env *env, struct client_obd *cli,
 		       oap, osc, rc);
 }
 
+struct extent_rpc_data {
+	struct list_head       *erd_rpc_list;
+	unsigned int		erd_page_count;
+	unsigned int		erd_max_pages;
+	unsigned int		erd_max_chunks;
+};
+
+static inline unsigned osc_extent_chunks(const struct osc_extent *ext)
+{
+	struct client_obd *cli = osc_cli(ext->oe_obj);
+	unsigned ppc_bits = cli->cl_chunkbits - PAGE_SHIFT;
+
+	return (ext->oe_end >> ppc_bits) - (ext->oe_start >> ppc_bits) + 1;
+}
+
 /**
  * Try to add extent to one RPC. We need to think about the following things:
  * - # of pages must not be over max_pages_per_rpc
  * - extent must be compatible with previous ones
  */
 static int try_to_add_extent_for_io(struct client_obd *cli,
-				    struct osc_extent *ext, struct list_head *rpclist,
-				    unsigned int *pc, unsigned int *max_pages)
+				    struct osc_extent *ext,
+				    struct extent_rpc_data *data)
 {
 	struct osc_extent *tmp;
+	unsigned int chunk_count;
 	struct osc_async_page *oap = list_first_entry(&ext->oe_pages,
 						      struct osc_async_page,
 						      oap_pending_item);
@@ -1901,19 +1915,22 @@ static int try_to_add_extent_for_io(struct client_obd *cli,
 	EASSERT((ext->oe_state == OES_CACHE || ext->oe_state == OES_LOCK_DONE),
 		ext);
 
-	*max_pages = max(ext->oe_mppr, *max_pages);
-	if (*pc + ext->oe_nr_pages > *max_pages)
+	chunk_count = osc_extent_chunks(ext);
+	if (chunk_count > data->erd_max_chunks)
+		return 0;
+
+	data->erd_max_pages = max(ext->oe_mppr, data->erd_max_pages);
+	if (data->erd_page_count + ext->oe_nr_pages > data->erd_max_pages)
 		return 0;
 
-	list_for_each_entry(tmp, rpclist, oe_link) {
+	list_for_each_entry(tmp, data->erd_rpc_list, oe_link) {
 		struct osc_async_page *oap2;
 
 		oap2 = list_first_entry(&tmp->oe_pages, struct osc_async_page,
 					oap_pending_item);
 		EASSERT(tmp->oe_owner == current, tmp);
 		if (oap2cl_page(oap)->cp_type != oap2cl_page(oap2)->cp_type) {
-			CDEBUG(D_CACHE, "Do not permit different type of IO"
-					" for a same RPC\n");
+			CDEBUG(D_CACHE, "Do not permit different type of IO in one RPC\n");
 			return 0;
 		}
 
@@ -1926,12 +1943,41 @@ static int try_to_add_extent_for_io(struct client_obd *cli,
 		break;
 	}
 
-	*pc += ext->oe_nr_pages;
-	list_move_tail(&ext->oe_link, rpclist);
+	data->erd_max_chunks -= chunk_count;
+	data->erd_page_count += ext->oe_nr_pages;
+	list_move_tail(&ext->oe_link, data->erd_rpc_list);
 	ext->oe_owner = current;
 	return 1;
 }
 
+static inline unsigned osc_max_write_chunks(const struct client_obd *cli)
+{
+	/*
+	 * LU-8135:
+	 *
+	 * The maximum size of a single transaction is about 64MB in ZFS.
+	 * #define DMU_MAX_ACCESS (64 * 1024 * 1024)
+	 *
+	 * Since ZFS is a copy-on-write file system, a single dirty page in
+	 * a chunk will result in the rewrite of the whole chunk, therefore
+	 * an RPC shouldn't be allowed to contain too many chunks otherwise
+	 * it will make transaction size much bigger than 64MB, especially
+	 * with big block size for ZFS.
+	 *
+	 * This piece of code is to make sure that OSC won't send write RPCs
+	 * with too many chunks. The maximum chunk size that an RPC can cover
+	 * is set to PTLRPC_MAX_BRW_SIZE, which is defined to 16MB. Ideally
+	 * OST should tell the client what the biggest transaction size is,
+	 * but it's good enough for now.
+	 *
+	 * This limitation doesn't apply to ldiskfs, which allows as many
+	 * chunks in one RPC as we want. However, it won't have any benefits
+	 * to have too many discontiguous pages in one RPC. Therefore, it
+	 * can only have 256 chunks at most in one RPC.
+	 */
+	return min(PTLRPC_MAX_BRW_SIZE >> cli->cl_chunkbits, 256);
+}
+
 /**
  * In order to prevent multiple ptlrpcd from breaking contiguous extents,
  * get_write_extent() takes all appropriate extents in atomic.
@@ -1951,26 +1997,28 @@ static unsigned int get_write_extents(struct osc_object *obj,
 	struct client_obd *cli = osc_cli(obj);
 	struct osc_extent *ext;
 	struct osc_extent *temp;
-	unsigned int page_count = 0;
-	unsigned int max_pages = cli->cl_max_pages_per_rpc;
+	struct extent_rpc_data data = {
+		.erd_rpc_list = rpclist,
+		.erd_page_count = 0,
+		.erd_max_pages = cli->cl_max_pages_per_rpc,
+		.erd_max_chunks = osc_max_write_chunks(cli),
+	};
 
 	LASSERT(osc_object_is_locked(obj));
 	list_for_each_entry_safe(ext, temp, &obj->oo_hp_exts, oe_link) {
 		LASSERT(ext->oe_state == OES_CACHE);
-		if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
-					      &max_pages))
-			return page_count;
-		EASSERT(ext->oe_nr_pages <= max_pages, ext);
+		if (!try_to_add_extent_for_io(cli, ext, &data))
+			return data.erd_page_count;
+		EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
 	}
-	if (page_count == max_pages)
-		return page_count;
+	if (data.erd_page_count == data.erd_max_pages)
+		return data.erd_page_count;
 
 	while (!list_empty(&obj->oo_urgent_exts)) {
 		ext = list_entry(obj->oo_urgent_exts.next,
 				 struct osc_extent, oe_link);
-		if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
-					      &max_pages))
-			return page_count;
+		if (!try_to_add_extent_for_io(cli, ext, &data))
+			return data.erd_page_count;
 
 		if (!ext->oe_intree)
 			continue;
@@ -1981,13 +2029,12 @@ static unsigned int get_write_extents(struct osc_object *obj,
 			     ext->oe_owner))
 				continue;
 
-			if (!try_to_add_extent_for_io(cli, ext, rpclist,
-						      &page_count, &max_pages))
-				return page_count;
+			if (!try_to_add_extent_for_io(cli, ext, &data))
+				return data.erd_page_count;
 		}
 	}
-	if (page_count == max_pages)
-		return page_count;
+	if (data.erd_page_count == data.erd_max_pages)
+		return data.erd_page_count;
 
 	ext = first_extent(obj);
 	while (ext) {
@@ -1998,13 +2045,12 @@ static unsigned int get_write_extents(struct osc_object *obj,
 			continue;
 		}
 
-		if (!try_to_add_extent_for_io(cli, ext, rpclist, &page_count,
-					      &max_pages))
-			return page_count;
+		if (!try_to_add_extent_for_io(cli, ext, &data))
+			return data.erd_page_count;
 
 		ext = next_extent(ext);
 	}
-	return page_count;
+	return data.erd_page_count;
 }
 
 static int
@@ -2089,27 +2135,29 @@ osc_send_read_rpc(const struct lu_env *env, struct client_obd *cli,
 	struct osc_extent *ext;
 	struct osc_extent *next;
 	LIST_HEAD(rpclist);
-	unsigned int page_count = 0;
-	unsigned int max_pages = cli->cl_max_pages_per_rpc;
+	struct extent_rpc_data data = {
+		.erd_rpc_list = &rpclist,
+		.erd_page_count = 0,
+		.erd_max_pages = cli->cl_max_pages_per_rpc,
+		.erd_max_chunks = UINT_MAX,
+	};
 	int rc = 0;
 
 	LASSERT(osc_object_is_locked(osc));
 	list_for_each_entry_safe(ext, next, &osc->oo_reading_exts, oe_link) {
 		EASSERT(ext->oe_state == OES_LOCK_DONE, ext);
-		if (!try_to_add_extent_for_io(cli, ext, &rpclist, &page_count,
-					      &max_pages))
+		if (!try_to_add_extent_for_io(cli, ext, &data))
 			break;
 		osc_extent_state_set(ext, OES_RPC);
-		EASSERT(ext->oe_nr_pages <= max_pages, ext);
+		EASSERT(ext->oe_nr_pages <= data.erd_max_pages, ext);
 	}
-	LASSERT(page_count <= max_pages);
+	LASSERT(data.erd_page_count <= data.erd_max_pages);
 
-	osc_update_pending(osc, OBD_BRW_READ, -page_count);
+	osc_update_pending(osc, OBD_BRW_READ, -data.erd_page_count);
 
 	if (!list_empty(&rpclist)) {
 		osc_object_unlock(osc);
 
-		LASSERT(page_count > 0);
 		rc = osc_build_rpc(env, cli, &rpclist, OBD_BRW_READ);
 		LASSERT(list_empty(&rpclist));
 
@@ -2710,8 +2758,8 @@ int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
 /**
  * Called by osc_io_setattr_start() to freeze and destroy covering extents.
  */
-int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
-			     struct osc_object *obj, __u64 size)
+int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
+			     u64 size, struct osc_extent **extp)
 {
 	struct client_obd *cli = osc_cli(obj);
 	struct osc_extent *ext;
@@ -2808,9 +2856,11 @@ again:
 			/* we need to hold this extent in OES_TRUNC state so
 			 * that no writeback will happen. This is to avoid
 			 * BUG 17397.
+			 * Only partial truncate can reach here, if @size is
+			 * not zero, the caller should provide a valid @extp.
 			 */
-			LASSERT(!oio->oi_trunc);
-			oio->oi_trunc = osc_extent_get(ext);
+			LASSERT(!*extp);
+			*extp = osc_extent_get(ext);
 			OSC_EXTENT_DUMP(D_CACHE, ext,
 					"trunc at %llu\n", size);
 		}
@@ -2836,13 +2886,10 @@ again:
 /**
  * Called after osc_io_setattr_end to add oio->oi_trunc back to cache.
  */
-void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
-			    struct osc_object *obj)
+void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext)
 {
-	struct osc_extent *ext = oio->oi_trunc;
-
-	oio->oi_trunc = NULL;
 	if (ext) {
+		struct osc_object *obj = ext->oe_obj;
 		bool unplug = false;
 
 		EASSERT(ext->oe_nr_pages > 0, ext);
@@ -3183,8 +3230,10 @@ static int discard_cb(const struct lu_env *env, struct cl_io *io,
 	/* page is top page. */
 	info->oti_next_index = osc_index(ops) + 1;
 	if (cl_page_own(env, io, page) == 0) {
-		KLASSERT(ergo(page->cp_type == CPT_CACHEABLE,
-			      !PageDirty(cl_page_vmpage(page))));
+		if (page->cp_type == CPT_CACHEABLE &&
+		    PageDirty(cl_page_vmpage(page)))
+			CL_PAGE_DEBUG(D_ERROR, env, page,
+				      "discard dirty page?\n");
 
 		/* discard the page */
 		cl_page_discard(env, io, page);
diff --git a/drivers/staging/lustre/lustre/osc/osc_cl_internal.h b/drivers/staging/lustre/lustre/osc/osc_cl_internal.h
index cce55a9689f0..c09ab97d64ae 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cl_internal.h
+++ b/drivers/staging/lustre/lustre/osc/osc_cl_internal.h
@@ -159,6 +159,10 @@ struct osc_object {
 	/* Protect osc_lock this osc_object has */
 	spinlock_t		oo_ol_spin;
 	struct list_head	oo_ol_list;
+
+	/** number of active IOs of this object */
+	atomic_t		oo_nr_ios;
+	wait_queue_head_t	oo_io_waitq;
 };
 
 static inline void osc_object_lock(struct osc_object *obj)
@@ -399,10 +403,9 @@ int osc_flush_async_page(const struct lu_env *env, struct cl_io *io,
 			 struct osc_page *ops);
 int osc_queue_sync_pages(const struct lu_env *env, struct osc_object *obj,
 			 struct list_head *list, int cmd, int brw_flags);
-int osc_cache_truncate_start(const struct lu_env *env, struct osc_io *oio,
-			     struct osc_object *obj, __u64 size);
-void osc_cache_truncate_end(const struct lu_env *env, struct osc_io *oio,
-			    struct osc_object *obj);
+int osc_cache_truncate_start(const struct lu_env *env, struct osc_object *obj,
+			     u64 size, struct osc_extent **extp);
+void osc_cache_truncate_end(const struct lu_env *env, struct osc_extent *ext);
 int osc_cache_writeback_range(const struct lu_env *env, struct osc_object *obj,
 			      pgoff_t start, pgoff_t end, int hp, int discard);
 int osc_cache_wait_range(const struct lu_env *env, struct osc_object *obj,
diff --git a/drivers/staging/lustre/lustre/osc/osc_internal.h b/drivers/staging/lustre/lustre/osc/osc_internal.h
index 688783dcc1e4..8abd83f26716 100644
--- a/drivers/staging/lustre/lustre/osc/osc_internal.h
+++ b/drivers/staging/lustre/lustre/osc/osc_internal.h
@@ -114,9 +114,9 @@ int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
 		     struct ptlrpc_request_set *rqset, int async, int agl);
 
 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
-		   __u32 type, union ldlm_policy_data *policy, __u32 mode,
-		   __u64 *flags, void *data, struct lustre_handle *lockh,
-		   int unref);
+		   enum ldlm_type type, union ldlm_policy_data *policy,
+		   enum ldlm_mode mode, __u64 *flags, void *data,
+		   struct lustre_handle *lockh, int unref);
 
 int osc_setattr_async(struct obd_export *exp, struct obdo *oa,
 		      obd_enqueue_update_f upcall, void *cookie,
@@ -181,6 +181,8 @@ static inline struct osc_device *obd2osc_dev(const struct obd_device *d)
 	return container_of0(d->obd_lu_dev, struct osc_device, od_cl.cd_lu_dev);
 }
 
+extern struct lu_kmem_descr osc_caches[];
+
 extern struct kmem_cache *osc_quota_kmem;
 struct osc_quota_info {
 	/** linkage for quota hash table */
@@ -218,4 +220,15 @@ struct ldlm_lock *osc_dlmlock_at_pgoff(const struct lu_env *env,
 				       struct osc_object *obj, pgoff_t index,
 				       enum osc_dap_flags flags);
 
+int osc_object_invalidate(const struct lu_env *env, struct osc_object *osc);
+
+/** osc shrink list to link all osc client obd */
+extern struct list_head osc_shrink_list;
+/** spin lock to protect osc_shrink_list */
+extern spinlock_t osc_shrink_lock;
+unsigned long osc_cache_shrink_count(struct shrinker *sk,
+				     struct shrink_control *sc);
+unsigned long osc_cache_shrink_scan(struct shrinker *sk,
+				    struct shrink_control *sc);
+
 #endif /* OSC_INTERNAL_H */
diff --git a/drivers/staging/lustre/lustre/osc/osc_io.c b/drivers/staging/lustre/lustre/osc/osc_io.c
index 228a97c098fe..0b4cc4283b05 100644
--- a/drivers/staging/lustre/lustre/osc/osc_io.c
+++ b/drivers/staging/lustre/lustre/osc/osc_io.c
@@ -37,6 +37,8 @@
 
 #define DEBUG_SUBSYSTEM S_OSC
 
+#include "../include/lustre_obdo.h"
+
 #include "osc_cl_internal.h"
 
 /** \addtogroup osc
@@ -97,6 +99,7 @@ static int osc_io_read_ahead(const struct lu_env *env,
 			ldlm_lock_decref(&lockh, dlmlock->l_req_mode);
 		}
 
+		ra->cra_rpc_size = osc_cli(osc)->cl_max_pages_per_rpc;
 		ra->cra_end = cl_index(osc2cl(osc),
 				       dlmlock->l_policy_data.l_extent.end);
 		ra->cra_release = osc_read_ahead_release;
@@ -136,7 +139,7 @@ static int osc_io_submit(const struct lu_env *env,
 
 	LASSERT(qin->pl_nr > 0);
 
-	CDEBUG(D_CACHE, "%d %d\n", qin->pl_nr, crt);
+	CDEBUG(D_CACHE | D_READA, "%d %d\n", qin->pl_nr, crt);
 
 	osc = cl2osc(ios->cis_obj);
 	cli = osc_cli(osc);
@@ -207,6 +210,18 @@ static int osc_io_submit(const struct lu_env *env,
 	if (queued > 0)
 		result = osc_queue_sync_pages(env, osc, &list, cmd, brw_flags);
 
+	/* Update c/mtime for sync write. LU-7310 */
+	if (qout->pl_nr > 0 && !result) {
+		struct cl_attr *attr = &osc_env_info(env)->oti_attr;
+		struct cl_object *obj = ios->cis_obj;
+
+		cl_object_attr_lock(obj);
+		attr->cat_mtime = LTIME_S(CURRENT_TIME);
+		attr->cat_ctime = attr->cat_mtime;
+		cl_object_attr_update(env, obj, attr, CAT_MTIME | CAT_CTIME);
+		cl_object_attr_unlock(obj);
+	}
+
 	CDEBUG(D_INFO, "%d/%d %d\n", qin->pl_nr, qout->pl_nr, result);
 	return qout->pl_nr > 0 ? 0 : result;
 }
@@ -330,8 +345,25 @@ static int osc_io_commit_async(const struct lu_env *env,
 	return result;
 }
 
-static int osc_io_rw_iter_init(const struct lu_env *env,
-			       const struct cl_io_slice *ios)
+static int osc_io_iter_init(const struct lu_env *env,
+			    const struct cl_io_slice *ios)
+{
+	struct osc_object *osc = cl2osc(ios->cis_obj);
+	struct obd_import *imp = osc_cli(osc)->cl_import;
+	int rc = -EIO;
+
+	spin_lock(&imp->imp_lock);
+	if (likely(!imp->imp_invalid)) {
+		atomic_inc(&osc->oo_nr_ios);
+		rc = 0;
+	}
+	spin_unlock(&imp->imp_lock);
+
+	return rc;
+}
+
+static int osc_io_write_iter_init(const struct lu_env *env,
+				  const struct cl_io_slice *ios)
 {
 	struct cl_io *io = ios->cis_io;
 	struct osc_io *oio = osc_env_io(env);
@@ -342,7 +374,7 @@ static int osc_io_rw_iter_init(const struct lu_env *env,
 	unsigned long max_pages;
 
 	if (cl_io_is_append(io))
-		return 0;
+		return osc_io_iter_init(env, ios);
 
 	npages = io->u.ci_rw.crw_count >> PAGE_SHIFT;
 	if (io->u.ci_rw.crw_pos & ~PAGE_MASK)
@@ -374,11 +406,21 @@ static int osc_io_rw_iter_init(const struct lu_env *env,
 		(void)ptlrpcd_queue_work(cli->cl_lru_work);
 	}
 
-	return 0;
+	return osc_io_iter_init(env, ios);
 }
 
-static void osc_io_rw_iter_fini(const struct lu_env *env,
-				const struct cl_io_slice *ios)
+static void osc_io_iter_fini(const struct lu_env *env,
+			     const struct cl_io_slice *ios)
+{
+	struct osc_object *osc = cl2osc(ios->cis_obj);
+
+	LASSERT(atomic_read(&osc->oo_nr_ios) > 0);
+	if (atomic_dec_and_test(&osc->oo_nr_ios))
+		wake_up_all(&osc->oo_io_waitq);
+}
+
+static void osc_io_write_iter_fini(const struct lu_env *env,
+				   const struct cl_io_slice *ios)
 {
 	struct osc_io *oio = osc_env_io(env);
 	struct osc_object *osc = cl2osc(ios->cis_obj);
@@ -389,6 +431,8 @@ static void osc_io_rw_iter_fini(const struct lu_env *env,
 		oio->oi_lru_reserved = 0;
 	}
 	oio->oi_write_osclock = NULL;
+
+	osc_io_iter_fini(env, ios);
 }
 
 static int osc_io_fault_start(const struct lu_env *env,
@@ -479,7 +523,8 @@ static int osc_io_setattr_start(const struct lu_env *env,
 
 	/* truncate cache dirty pages first */
 	if (cl_io_is_trunc(io))
-		result = osc_cache_truncate_start(env, oio, cl2osc(obj), size);
+		result = osc_cache_truncate_start(env, cl2osc(obj), size,
+						  &oio->oi_trunc);
 
 	if (result == 0 && oio->oi_lockless == 0) {
 		cl_object_attr_lock(obj);
@@ -589,10 +634,8 @@ static void osc_io_setattr_end(const struct lu_env *env,
 		__u64 size = io->u.ci_setattr.sa_attr.lvb_size;
 
 		osc_trunc_check(env, io, oio, size);
-		if (oio->oi_trunc) {
-			osc_cache_truncate_end(env, oio, cl2osc(obj));
-			oio->oi_trunc = NULL;
-		}
+		osc_cache_truncate_end(env, oio->oi_trunc);
+		oio->oi_trunc = NULL;
 	}
 }
 
@@ -669,7 +712,7 @@ static int osc_io_data_version_start(const struct lu_env *env,
 
 	ptlrpc_request_set_replen(req);
 	req->rq_interpret_reply = osc_data_version_interpret;
-	CLASSERT(sizeof(*dva) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*dva) > sizeof(req->rq_async_args));
 	dva = ptlrpc_req_async_args(req);
 	dva->dva_oio = oio;
 
@@ -832,17 +875,21 @@ static void osc_io_end(const struct lu_env *env,
 static const struct cl_io_operations osc_io_ops = {
 	.op = {
 		[CIT_READ] = {
+			.cio_iter_init	= osc_io_iter_init,
+			.cio_iter_fini	= osc_io_iter_fini,
 			.cio_start  = osc_io_read_start,
 			.cio_fini   = osc_io_fini
 		},
 		[CIT_WRITE] = {
-			.cio_iter_init = osc_io_rw_iter_init,
-			.cio_iter_fini = osc_io_rw_iter_fini,
+			.cio_iter_init	= osc_io_write_iter_init,
+			.cio_iter_fini	= osc_io_write_iter_fini,
 			.cio_start  = osc_io_write_start,
 			.cio_end    = osc_io_end,
 			.cio_fini   = osc_io_fini
 		},
 		[CIT_SETATTR] = {
+			.cio_iter_init	= osc_io_iter_init,
+			.cio_iter_fini	= osc_io_iter_fini,
 			.cio_start  = osc_io_setattr_start,
 			.cio_end    = osc_io_setattr_end
 		},
@@ -851,6 +898,8 @@ static const struct cl_io_operations osc_io_ops = {
 			.cio_end	= osc_io_data_version_end,
 		},
 		[CIT_FAULT] = {
+			.cio_iter_init	= osc_io_iter_init,
+			.cio_iter_fini	= osc_io_iter_fini,
 			.cio_start  = osc_io_fault_start,
 			.cio_end    = osc_io_end,
 			.cio_fini   = osc_io_fini
diff --git a/drivers/staging/lustre/lustre/osc/osc_object.c b/drivers/staging/lustre/lustre/osc/osc_object.c
index e0c3324857dd..d3e5ca7db7b2 100644
--- a/drivers/staging/lustre/lustre/osc/osc_object.c
+++ b/drivers/staging/lustre/lustre/osc/osc_object.c
@@ -78,6 +78,9 @@ static int osc_object_init(const struct lu_env *env, struct lu_object *obj,
 	INIT_LIST_HEAD(&osc->oo_write_item);
 	INIT_LIST_HEAD(&osc->oo_read_item);
 
+	atomic_set(&osc->oo_nr_ios, 0);
+	init_waitqueue_head(&osc->oo_io_waitq);
+
 	osc->oo_root.rb_node = NULL;
 	INIT_LIST_HEAD(&osc->oo_hp_exts);
 	INIT_LIST_HEAD(&osc->oo_urgent_exts);
@@ -112,6 +115,7 @@ static void osc_object_free(const struct lu_env *env, struct lu_object *obj)
 	LASSERT(atomic_read(&osc->oo_nr_reads) == 0);
 	LASSERT(atomic_read(&osc->oo_nr_writes) == 0);
 	LASSERT(list_empty(&osc->oo_ol_list));
+	LASSERT(!atomic_read(&osc->oo_nr_ios));
 
 	lu_object_fini(obj);
 	kmem_cache_free(osc_object_kmem, osc);
@@ -444,4 +448,19 @@ struct lu_object *osc_object_alloc(const struct lu_env *env,
 	return obj;
 }
 
+int osc_object_invalidate(const struct lu_env *env, struct osc_object *osc)
+{
+	struct l_wait_info lwi = { 0 };
+
+	CDEBUG(D_INODE, "Invalidate osc object: %p, # of active IOs: %d\n",
+	       osc, atomic_read(&osc->oo_nr_ios));
+
+	l_wait_event(osc->oo_io_waitq, !atomic_read(&osc->oo_nr_ios), &lwi);
+
+	/* Discard all pages of this object. */
+	osc_cache_truncate_start(env, osc, 0, NULL);
+
+	return 0;
+}
+
 /** @} osc */
diff --git a/drivers/staging/lustre/lustre/osc/osc_page.c b/drivers/staging/lustre/lustre/osc/osc_page.c
index e356e4af08e1..ab9d0d7bb943 100644
--- a/drivers/staging/lustre/lustre/osc/osc_page.c
+++ b/drivers/staging/lustre/lustre/osc/osc_page.c
@@ -370,12 +370,17 @@ static int osc_cache_too_much(struct client_obd *cli)
 			return lru_shrink_min(cli);
 	} else {
 		time64_t duration = ktime_get_real_seconds();
+		long timediff;
 
 		/* knock out pages by duration of no IO activity */
 		duration -= cli->cl_lru_last_used;
-		duration >>= 6; /* approximately 1 minute */
-		if (duration > 0 &&
-		    pages >= div64_s64((s64)budget, duration))
+		/*
+		 * The difference shouldn't be more than 70 years
+		 * so we can safely case to a long. Round to
+		 * approximately 1 minute.
+		 */
+		timediff = (long)(duration >> 6);
+		if (timediff > 0 && pages >= budget / timediff)
 			return lru_shrink_min(cli);
 	}
 	return 0;
@@ -943,4 +948,91 @@ bool osc_over_unstable_soft_limit(struct client_obd *cli)
 				    cli->cl_max_rpcs_in_flight;
 }
 
+/**
+ * Return how many LRU pages in the cache of all OSC devices
+ *
+ * Return:	return # of cached LRU pages times reclaimation tendency
+ *		SHRINK_STOP if it cannot do any scanning in this time
+ */
+unsigned long osc_cache_shrink_count(struct shrinker *sk,
+				     struct shrink_control *sc)
+{
+	struct client_obd *cli;
+	unsigned long cached = 0;
+
+	spin_lock(&osc_shrink_lock);
+	list_for_each_entry(cli, &osc_shrink_list, cl_shrink_list)
+		cached += atomic_long_read(&cli->cl_lru_in_list);
+	spin_unlock(&osc_shrink_lock);
+
+	return (cached  * sysctl_vfs_cache_pressure) / 100;
+}
+
+/**
+ * Scan and try to reclaim sc->nr_to_scan cached LRU pages
+ *
+ * Return:	number of cached LRU pages reclaimed
+ *		SHRINK_STOP if it cannot do any scanning in this time
+ *
+ * Linux kernel will loop calling this shrinker scan routine with
+ * sc->nr_to_scan = SHRINK_BATCH(128 for now) until kernel got enough memory.
+ *
+ * If sc->nr_to_scan is 0, the VM is querying the cache size, we don't need
+ * to scan and try to reclaim LRU pages, just return 0 and
+ * osc_cache_shrink_count() will report the LRU page number.
+ */
+unsigned long osc_cache_shrink_scan(struct shrinker *sk,
+				    struct shrink_control *sc)
+{
+	struct client_obd *stop_anchor = NULL;
+	struct client_obd *cli;
+	struct lu_env *env;
+	long shrank = 0;
+	int refcheck;
+	int rc;
+
+	if (!sc->nr_to_scan)
+		return 0;
+
+	if (!(sc->gfp_mask & __GFP_FS))
+		return SHRINK_STOP;
+
+	env = cl_env_get(&refcheck);
+	if (IS_ERR(env))
+		return SHRINK_STOP;
+
+	spin_lock(&osc_shrink_lock);
+	while (!list_empty(&osc_shrink_list)) {
+		cli = list_entry(osc_shrink_list.next, struct client_obd,
+				 cl_shrink_list);
+
+		if (!stop_anchor)
+			stop_anchor = cli;
+		else if (cli == stop_anchor)
+			break;
+
+		list_move_tail(&cli->cl_shrink_list, &osc_shrink_list);
+		spin_unlock(&osc_shrink_lock);
+
+		/* shrink no more than max_pages_per_rpc for an OSC */
+		rc = osc_lru_shrink(env, cli, (sc->nr_to_scan - shrank) >
+				    cli->cl_max_pages_per_rpc ?
+				    cli->cl_max_pages_per_rpc :
+				    sc->nr_to_scan - shrank, true);
+		if (rc > 0)
+			shrank += rc;
+
+		if (shrank >= sc->nr_to_scan)
+			goto out;
+
+		spin_lock(&osc_shrink_lock);
+	}
+	spin_unlock(&osc_shrink_lock);
+
+out:
+	cl_env_put(env, &refcheck);
+
+	return shrank;
+}
+
 /** @} osc */
diff --git a/drivers/staging/lustre/lustre/osc/osc_request.c b/drivers/staging/lustre/lustre/osc/osc_request.c
index 7143564ae7e7..c4cfe18c3294 100644
--- a/drivers/staging/lustre/lustre/osc/osc_request.c
+++ b/drivers/staging/lustre/lustre/osc/osc_request.c
@@ -43,6 +43,7 @@
 #include "../include/lprocfs_status.h"
 #include "../include/lustre/lustre_ioctl.h"
 #include "../include/lustre_debug.h"
+#include "../include/lustre_obdo.h"
 #include "../include/lustre_param.h"
 #include "../include/lustre_fid.h"
 #include "../include/obd_class.h"
@@ -250,7 +251,7 @@ int osc_setattr_async(struct obd_export *exp, struct obdo *oa,
 		req->rq_interpret_reply =
 			(ptlrpc_interpterer_t)osc_setattr_interpret;
 
-		CLASSERT(sizeof(*sa) <= sizeof(req->rq_async_args));
+		BUILD_BUG_ON(sizeof(*sa) > sizeof(req->rq_async_args));
 		sa = ptlrpc_req_async_args(req);
 		sa->sa_oa = oa;
 		sa->sa_upcall = upcall;
@@ -348,7 +349,7 @@ int osc_punch_base(struct obd_export *exp, struct obdo *oa,
 	ptlrpc_request_set_replen(req);
 
 	req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
-	CLASSERT(sizeof(*sa) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*sa) > sizeof(req->rq_async_args));
 	sa = ptlrpc_req_async_args(req);
 	sa->sa_oa = oa;
 	sa->sa_upcall = upcall;
@@ -429,7 +430,7 @@ int osc_sync_base(struct osc_object *obj, struct obdo *oa,
 	ptlrpc_request_set_replen(req);
 	req->rq_interpret_reply = osc_sync_interpret;
 
-	CLASSERT(sizeof(*fa) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*fa) > sizeof(req->rq_async_args));
 	fa = ptlrpc_req_async_args(req);
 	fa->fa_obj = obj;
 	fa->fa_oa = oa;
@@ -1170,7 +1171,7 @@ static int osc_brw_prep_request(int cmd, struct client_obd *cli,
 	}
 	ptlrpc_request_set_replen(req);
 
-	CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*aa) > sizeof(req->rq_async_args));
 	aa = ptlrpc_req_async_args(req);
 	aa->aa_oa = oa;
 	aa->aa_requested_nob = requested_nob;
@@ -1757,7 +1758,7 @@ int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
 	cl_req_attr_set(env, osc2cl(obj), crattr);
 	lustre_msg_set_jobid(req->rq_reqmsg, crattr->cra_jobid);
 
-	CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*aa) > sizeof(req->rq_async_args));
 	aa = ptlrpc_req_async_args(req);
 	INIT_LIST_HEAD(&aa->aa_oaps);
 	list_splice_init(&rpc_list, &aa->aa_oaps);
@@ -2038,7 +2039,7 @@ no_match:
 		if (!rc) {
 			struct osc_enqueue_args *aa;
 
-			CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+			BUILD_BUG_ON(sizeof(*aa) > sizeof(req->rq_async_args));
 			aa = ptlrpc_req_async_args(req);
 			aa->oa_exp = exp;
 			aa->oa_mode = einfo->ei_mode;
@@ -2080,9 +2081,9 @@ no_match:
 }
 
 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
-		   __u32 type, union ldlm_policy_data *policy, __u32 mode,
-		   __u64 *flags, void *data, struct lustre_handle *lockh,
-		   int unref)
+		   enum ldlm_type type, union ldlm_policy_data *policy,
+		   enum ldlm_mode mode, __u64 *flags, void *data,
+		   struct lustre_handle *lockh, int unref)
 {
 	struct obd_device *obd = exp->exp_obd;
 	__u64 lflags = *flags;
@@ -2195,7 +2196,7 @@ static int osc_statfs_async(struct obd_export *exp,
 	}
 
 	req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
-	CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*aa) > sizeof(req->rq_async_args));
 	aa = ptlrpc_req_async_args(req);
 	aa->aa_oi = oinfo;
 
@@ -2400,7 +2401,7 @@ static int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
 		struct osc_brw_async_args *aa;
 		struct obdo *oa;
 
-		CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+		BUILD_BUG_ON(sizeof(*aa) > sizeof(req->rq_async_args));
 		aa = ptlrpc_req_async_args(req);
 		oa = kmem_cache_zalloc(obdo_cachep, GFP_NOFS);
 		if (!oa) {
@@ -2479,6 +2480,33 @@ static int osc_disconnect(struct obd_export *exp)
 	return rc;
 }
 
+static int osc_ldlm_resource_invalidate(struct cfs_hash *hs,
+					struct cfs_hash_bd *bd,
+					struct hlist_node *hnode, void *arg)
+{
+	struct ldlm_resource *res = cfs_hash_object(hs, hnode);
+	struct osc_object *osc = NULL;
+	struct lu_env *env = arg;
+	struct ldlm_lock *lock;
+
+	lock_res(res);
+	list_for_each_entry(lock, &res->lr_granted, l_res_link) {
+		if (lock->l_ast_data && !osc) {
+			osc = lock->l_ast_data;
+			cl_object_get(osc2cl(osc));
+		}
+		lock->l_ast_data = NULL;
+	}
+	unlock_res(res);
+
+	if (osc) {
+		osc_object_invalidate(env, osc);
+		cl_object_put(env, osc2cl(osc));
+	}
+
+	return 0;
+}
+
 static int osc_import_event(struct obd_device *obd,
 			    struct obd_import *imp,
 			    enum obd_import_event event)
@@ -2506,17 +2534,18 @@ static int osc_import_event(struct obd_device *obd,
 		struct lu_env *env;
 		int refcheck;
 
+		ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
+
 		env = cl_env_get(&refcheck);
 		if (!IS_ERR(env)) {
-			/* Reset grants */
-			cli = &obd->u.cli;
-			/* all pages go to failing rpcs due to the invalid
-			 * import
-			 */
-			osc_io_unplug(env, cli, NULL);
+			osc_io_unplug(env, &obd->u.cli, NULL);
 
-			ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
+			cfs_hash_for_each_nolock(ns->ns_rs_hash,
+						 osc_ldlm_resource_invalidate,
+						 env, 0);
 			cl_env_put(env, &refcheck);
+
+			ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
 		} else {
 			rc = PTR_ERR(env);
 		}
@@ -2646,6 +2675,11 @@ int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 
 	INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
 	ns_register_cancel(obd->obd_namespace, osc_cancel_weight);
+
+	spin_lock(&osc_shrink_lock);
+	list_add_tail(&cli->cl_shrink_list, &osc_shrink_list);
+	spin_unlock(&osc_shrink_lock);
+
 	return rc;
 
 out_ptlrpcd_work:
@@ -2699,6 +2733,10 @@ static int osc_cleanup(struct obd_device *obd)
 	struct client_obd *cli = &obd->u.cli;
 	int rc;
 
+	spin_lock(&osc_shrink_lock);
+	list_del(&cli->cl_shrink_list);
+	spin_unlock(&osc_shrink_lock);
+
 	/* lru cleanup */
 	if (cli->cl_cache) {
 		LASSERT(atomic_read(&cli->cl_cache->ccc_users) > 0);
@@ -2766,7 +2804,14 @@ static struct obd_ops osc_obd_ops = {
 	.quotactl       = osc_quotactl,
 };
 
-extern struct lu_kmem_descr osc_caches[];
+struct list_head osc_shrink_list = LIST_HEAD_INIT(osc_shrink_list);
+DEFINE_SPINLOCK(osc_shrink_lock);
+
+static struct shrinker osc_cache_shrinker = {
+	.count_objects	= osc_cache_shrink_count,
+	.scan_objects	= osc_cache_shrink_scan,
+	.seeks		= DEFAULT_SEEKS,
+};
 
 static int __init osc_init(void)
 {
@@ -2792,6 +2837,8 @@ static int __init osc_init(void)
 	if (rc)
 		goto out_kmem;
 
+	register_shrinker(&osc_cache_shrinker);
+
 	/* This is obviously too much memory, only prevent overflow here */
 	if (osc_reqpool_mem_max >= 1 << 12 || osc_reqpool_mem_max == 0) {
 		rc = -EINVAL;
@@ -2830,6 +2877,7 @@ out_kmem:
 
 static void /*__exit*/ osc_exit(void)
 {
+	unregister_shrinker(&osc_cache_shrinker);
 	class_unregister_type(LUSTRE_OSC_NAME);
 	lu_kmem_fini(osc_caches);
 	ptlrpc_free_rq_pool(osc_rq_pool);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/client.c b/drivers/staging/lustre/lustre/ptlrpc/client.c
index 804741362bc0..04a98a08ece1 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/client.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/client.c
@@ -1160,7 +1160,7 @@ static int ptlrpc_import_delay_req(struct obd_import *imp,
 		if (atomic_read(&imp->imp_inval_count) != 0) {
 			DEBUG_REQ(D_ERROR, req, "invalidate in flight");
 			*status = -EIO;
-		} else if (imp->imp_dlm_fake || req->rq_no_delay) {
+		} else if (req->rq_no_delay) {
 			*status = -EWOULDBLOCK;
 		} else if (req->rq_allow_replay &&
 			  (imp->imp_state == LUSTRE_IMP_REPLAY ||
@@ -2662,11 +2662,16 @@ free_req:
 	list_for_each_entry_safe(req, saved, &imp->imp_committed_list,
 				 rq_replay_list) {
 		LASSERT(req->rq_transno != 0);
-		if (req->rq_import_generation < imp->imp_generation) {
-			DEBUG_REQ(D_RPCTRACE, req, "free stale open request");
-			ptlrpc_free_request(req);
-		} else if (!req->rq_replay) {
-			DEBUG_REQ(D_RPCTRACE, req, "free closed open request");
+		if (req->rq_import_generation < imp->imp_generation ||
+		    !req->rq_replay) {
+			DEBUG_REQ(D_RPCTRACE, req, "free %s open request",
+				  req->rq_import_generation <
+				  imp->imp_generation ? "stale" : "closed");
+
+			if (imp->imp_replay_cursor == &req->rq_replay_list)
+				imp->imp_replay_cursor =
+					req->rq_replay_list.next;
+
 			ptlrpc_free_request(req);
 		}
 	}
@@ -3070,7 +3075,7 @@ void ptlrpc_init_xid(void)
 	}
 
 	/* Always need to be aligned to a power-of-two for multi-bulk BRW */
-	CLASSERT(((PTLRPC_BULK_OPS_COUNT - 1) & PTLRPC_BULK_OPS_COUNT) == 0);
+	BUILD_BUG_ON(((PTLRPC_BULK_OPS_COUNT - 1) & PTLRPC_BULK_OPS_COUNT) != 0);
 	ptlrpc_last_xid &= PTLRPC_BULK_OPS_MASK;
 }
 
@@ -3123,8 +3128,11 @@ void ptlrpc_set_bulk_mbits(struct ptlrpc_request *req)
 			req->rq_mbits = ptlrpc_next_xid();
 		} else {
 			/* old version transfers rq_xid to peer as matchbits */
-			req->rq_mbits = ptlrpc_next_xid();
-			req->rq_xid = req->rq_mbits;
+			spin_lock(&req->rq_import->imp_lock);
+			list_del_init(&req->rq_unreplied_list);
+			ptlrpc_assign_next_xid_nolock(req);
+			req->rq_mbits = req->rq_xid;
+			spin_unlock(&req->rq_import->imp_lock);
 		}
 
 		CDEBUG(D_HA, "resend bulk old x%llu new x%llu\n",
@@ -3256,7 +3264,7 @@ void *ptlrpcd_alloc_work(struct obd_import *imp,
 	req->rq_no_resend = 1;
 	req->rq_pill.rc_fmt = (void *)&worker_format;
 
-	CLASSERT(sizeof(*args) <= sizeof(req->rq_async_args));
+	BUILD_BUG_ON(sizeof(*args) > sizeof(req->rq_async_args));
 	args = ptlrpc_req_async_args(req);
 	args->cb = cb;
 	args->cbdata = cbdata;
diff --git a/drivers/staging/lustre/lustre/ptlrpc/events.c b/drivers/staging/lustre/lustre/ptlrpc/events.c
index 49f3e6368415..dc0fe9d660da 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/events.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/events.c
@@ -277,7 +277,7 @@ static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
 		 * then we hope there will be less RPCs per bucket at some
 		 * point, and sequence will catch up again
 		 */
-		svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
+		svcpt->scp_hist_seq += (1ULL << REQS_SEQ_SHIFT(svcpt));
 		new_seq = svcpt->scp_hist_seq;
 	}
 
@@ -420,7 +420,8 @@ void reply_out_callback(lnet_event_t *ev)
 		rs->rs_on_net = 0;
 		if (!rs->rs_no_ack ||
 		    rs->rs_transno <=
-		    rs->rs_export->exp_obd->obd_last_committed)
+		    rs->rs_export->exp_obd->obd_last_committed ||
+		    list_empty(&rs->rs_obd_list))
 			ptlrpc_schedule_difficult_reply(rs);
 
 		spin_unlock(&rs->rs_lock);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index e8280194001c..93e172fe9ce4 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/import.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
@@ -703,7 +703,7 @@ int ptlrpc_connect_import(struct obd_import *imp)
 	ptlrpc_request_set_replen(request);
 	request->rq_interpret_reply = ptlrpc_connect_interpret;
 
-	CLASSERT(sizeof(*aa) <= sizeof(request->rq_async_args));
+	BUILD_BUG_ON(sizeof(*aa) > sizeof(request->rq_async_args));
 	aa = ptlrpc_req_async_args(request);
 	memset(aa, 0, sizeof(*aa));
 
diff --git a/drivers/staging/lustre/lustre/ptlrpc/layout.c b/drivers/staging/lustre/lustre/ptlrpc/layout.c
index 99d7c667df28..356d73511ea3 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/layout.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/layout.c
@@ -42,8 +42,6 @@
  * of the format that the request conforms to.
  */
 
-#if !defined(__REQ_LAYOUT_USER__)
-
 #define DEBUG_SUBSYSTEM S_RPC
 
 #include <linux/module.h>
@@ -57,8 +55,6 @@
 #include "../include/obd.h"
 #include "../include/obd_support.h"
 
-/* __REQ_LAYOUT_USER__ */
-#endif
 /* struct ptlrpc_request, lustre_msg* */
 #include "../include/lustre_req_layout.h"
 #include "../include/lustre_acl.h"
@@ -1181,6 +1177,23 @@ struct req_format RQF_FLD_QUERY =
 	DEFINE_REQ_FMT0("FLD_QUERY", fld_query_client, fld_query_server);
 EXPORT_SYMBOL(RQF_FLD_QUERY);
 
+/*
+ * The 'fld_read_server' uses 'RMF_GENERIC_DATA' to hold the 'FLD_QUERY'
+ * RPC reply that is composed of 'struct lu_seq_range_array'. But there
+ * is not registered swabber function for 'RMF_GENERIC_DATA'. So the RPC
+ * peers need to handle the RPC reply with fixed little-endian format.
+ *
+ * In theory, we can define new structure with some swabber registered to
+ * handle the 'FLD_QUERY' RPC reply result automatically. But from the
+ * implementation view, it is not easy to be done within current "struct
+ * req_msg_field" framework. Because the sequence range array in the RPC
+ * reply is not fixed length, instead, its length depends on 'lu_seq_range'
+ * count, that is unknown when prepare the RPC buffer. Generally, for such
+ * flexible length RPC usage, there will be a field in the RPC layout to
+ * indicate the data length. But for the 'FLD_READ' RPC, we have no way to
+ * do that unless we add new length filed that will broken the on-wire RPC
+ * protocol and cause interoperability trouble with old peer.
+ */
 struct req_format RQF_FLD_READ =
 	DEFINE_REQ_FMT0("FLD_READ", fld_read_client, fld_read_server);
 EXPORT_SYMBOL(RQF_FLD_READ);
@@ -1541,8 +1554,6 @@ struct req_format RQF_OST_GET_INFO_FIEMAP =
 			ost_get_fiemap_server);
 EXPORT_SYMBOL(RQF_OST_GET_INFO_FIEMAP);
 
-#if !defined(__REQ_LAYOUT_USER__)
-
 /* Convenience macro */
 #define FMT_FIELD(fmt, i, j) (fmt)->rf_fields[(i)].d[(j)]
 
@@ -2221,6 +2232,3 @@ void req_capsule_shrink(struct req_capsule *pill,
 							    1);
 }
 EXPORT_SYMBOL(req_capsule_shrink);
-
-/* __REQ_LAYOUT_USER__ */
-#endif
diff --git a/drivers/staging/lustre/lustre/ptlrpc/niobuf.c b/drivers/staging/lustre/lustre/ptlrpc/niobuf.c
index da1209e40f03..b8701841ab4a 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/niobuf.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/niobuf.c
@@ -522,13 +522,14 @@ int ptl_send_rpc(struct ptlrpc_request *request, int noreply)
 		 */
 		spin_lock(&imp->imp_lock);
 		ptlrpc_assign_next_xid_nolock(request);
-		request->rq_mbits = request->rq_xid;
 		min_xid = ptlrpc_known_replied_xid(imp);
 		spin_unlock(&imp->imp_lock);
 
 		lustre_msg_set_last_xid(request->rq_reqmsg, min_xid);
 		DEBUG_REQ(D_RPCTRACE, request, "Allocating new xid for resend on EINPROGRESS");
-	} else if (request->rq_bulk) {
+	}
+
+	if (request->rq_bulk) {
 		ptlrpc_set_bulk_mbits(request);
 		lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits);
 	}
diff --git a/drivers/staging/lustre/lustre/ptlrpc/nrs.c b/drivers/staging/lustre/lustre/ptlrpc/nrs.c
index 7b6ffb195834..ef19dbe2ea5c 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/nrs.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/nrs.c
@@ -1559,9 +1559,6 @@ out:
 	return rc;
 }
 
-/* ptlrpc/nrs_fifo.c */
-extern struct ptlrpc_nrs_pol_conf nrs_conf_fifo;
-
 /**
  * Adds all policies that ship with the ptlrpc module, to NRS core's list of
  * policies \e nrs_core.nrs_policies.
diff --git a/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c b/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
index 13f00b7cbbe5..9456a1825918 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
@@ -469,6 +469,7 @@ int lustre_shrink_msg(struct lustre_msg *msg, int segment,
 	default:
 		LASSERTF(0, "incorrect message magic: %08x\n", msg->lm_magic);
 	}
+	return 0;
 }
 EXPORT_SYMBOL(lustre_shrink_msg);
 
@@ -509,8 +510,8 @@ static int lustre_unpack_msg_v2(struct lustre_msg_v2 *m, int len)
 		__swab32s(&m->lm_repsize);
 		__swab32s(&m->lm_cksum);
 		__swab32s(&m->lm_flags);
-		CLASSERT(offsetof(typeof(*m), lm_padding_2) != 0);
-		CLASSERT(offsetof(typeof(*m), lm_padding_3) != 0);
+		BUILD_BUG_ON(offsetof(typeof(*m), lm_padding_2) == 0);
+		BUILD_BUG_ON(offsetof(typeof(*m), lm_padding_3) == 0);
 	}
 
 	required_len = lustre_msg_hdr_size_v2(m->lm_bufcount);
@@ -1525,18 +1526,18 @@ void lustre_swab_ptlrpc_body(struct ptlrpc_body *b)
 	__swab64s(&b->pb_pre_versions[2]);
 	__swab64s(&b->pb_pre_versions[3]);
 	__swab64s(&b->pb_mbits);
-	CLASSERT(offsetof(typeof(*b), pb_padding0) != 0);
-	CLASSERT(offsetof(typeof(*b), pb_padding1) != 0);
-	CLASSERT(offsetof(typeof(*b), pb_padding64_0) != 0);
-	CLASSERT(offsetof(typeof(*b), pb_padding64_1) != 0);
-	CLASSERT(offsetof(typeof(*b), pb_padding64_2) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), pb_padding0) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), pb_padding1) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), pb_padding64_0) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), pb_padding64_1) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), pb_padding64_2) == 0);
 	/* While we need to maintain compatibility between
 	 * clients and servers without ptlrpc_body_v2 (< 2.3)
 	 * do not swab any fields beyond pb_jobid, as we are
 	 * using this swab function for both ptlrpc_body
 	 * and ptlrpc_body_v2.
 	 */
-	CLASSERT(offsetof(typeof(*b), pb_jobid) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), pb_jobid) == 0);
 }
 
 void lustre_swab_connect(struct obd_connect_data *ocd)
@@ -1567,23 +1568,23 @@ void lustre_swab_connect(struct obd_connect_data *ocd)
 		__swab64s(&ocd->ocd_maxbytes);
 	if (ocd->ocd_connect_flags & OBD_CONNECT_MULTIMODRPCS)
 		__swab16s(&ocd->ocd_maxmodrpcs);
-	CLASSERT(offsetof(typeof(*ocd), padding0));
-	CLASSERT(offsetof(typeof(*ocd), padding1) != 0);
+	BUILD_BUG_ON(!offsetof(typeof(*ocd), padding0));
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding1) == 0);
 	if (ocd->ocd_connect_flags & OBD_CONNECT_FLAGS2)
 		__swab64s(&ocd->ocd_connect_flags2);
-	CLASSERT(offsetof(typeof(*ocd), padding3) != 0);
-	CLASSERT(offsetof(typeof(*ocd), padding4) != 0);
-	CLASSERT(offsetof(typeof(*ocd), padding5) != 0);
-	CLASSERT(offsetof(typeof(*ocd), padding6) != 0);
-	CLASSERT(offsetof(typeof(*ocd), padding7) != 0);
-	CLASSERT(offsetof(typeof(*ocd), padding8) != 0);
-	CLASSERT(offsetof(typeof(*ocd), padding9) != 0);
-	CLASSERT(offsetof(typeof(*ocd), paddingA) != 0);
-	CLASSERT(offsetof(typeof(*ocd), paddingB) != 0);
-	CLASSERT(offsetof(typeof(*ocd), paddingC) != 0);
-	CLASSERT(offsetof(typeof(*ocd), paddingD) != 0);
-	CLASSERT(offsetof(typeof(*ocd), paddingE) != 0);
-	CLASSERT(offsetof(typeof(*ocd), paddingF) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding3) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding4) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding5) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding6) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding7) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding8) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), padding9) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), paddingA) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), paddingB) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), paddingC) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), paddingD) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), paddingE) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*ocd), paddingF) == 0);
 }
 
 static void lustre_swab_obdo(struct obdo *o)
@@ -1613,9 +1614,9 @@ static void lustre_swab_obdo(struct obdo *o)
 	__swab32s(&o->o_uid_h);
 	__swab32s(&o->o_gid_h);
 	__swab64s(&o->o_data_version);
-	CLASSERT(offsetof(typeof(*o), o_padding_4) != 0);
-	CLASSERT(offsetof(typeof(*o), o_padding_5) != 0);
-	CLASSERT(offsetof(typeof(*o), o_padding_6) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*o), o_padding_4) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*o), o_padding_5) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*o), o_padding_6) == 0);
 }
 
 void lustre_swab_obd_statfs(struct obd_statfs *os)
@@ -1631,15 +1632,15 @@ void lustre_swab_obd_statfs(struct obd_statfs *os)
 	__swab32s(&os->os_namelen);
 	__swab64s(&os->os_maxbytes);
 	__swab32s(&os->os_state);
-	CLASSERT(offsetof(typeof(*os), os_fprecreated) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare2) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare3) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare4) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare5) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare6) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare7) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare8) != 0);
-	CLASSERT(offsetof(typeof(*os), os_spare9) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_fprecreated) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare2) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare3) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare4) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare5) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare6) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare7) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare8) == 0);
+	BUILD_BUG_ON(offsetof(typeof(*os), os_spare9) == 0);
 }
 
 void lustre_swab_obd_ioobj(struct obd_ioobj *ioo)
@@ -1679,7 +1680,7 @@ void lustre_swab_gl_desc(union ldlm_gl_desc *desc)
 	__swab64s(&desc->lquota_desc.gl_hardlimit);
 	__swab64s(&desc->lquota_desc.gl_softlimit);
 	__swab64s(&desc->lquota_desc.gl_time);
-	CLASSERT(offsetof(typeof(desc->lquota_desc), gl_pad2) != 0);
+	BUILD_BUG_ON(offsetof(typeof(desc->lquota_desc), gl_pad2) == 0);
 }
 
 void lustre_swab_ost_lvb_v1(struct ost_lvb_v1 *lvb)
@@ -1738,24 +1739,24 @@ void lustre_swab_mdt_body(struct mdt_body *b)
 	__swab32s(&b->mbo_flags);
 	__swab32s(&b->mbo_rdev);
 	__swab32s(&b->mbo_nlink);
-	CLASSERT(offsetof(typeof(*b), mbo_unused2) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), mbo_unused2) == 0);
 	__swab32s(&b->mbo_suppgid);
 	__swab32s(&b->mbo_eadatasize);
 	__swab32s(&b->mbo_aclsize);
 	__swab32s(&b->mbo_max_mdsize);
-	CLASSERT(offsetof(typeof(*b), mbo_unused3));
+	BUILD_BUG_ON(!offsetof(typeof(*b), mbo_unused3));
 	__swab32s(&b->mbo_uid_h);
 	__swab32s(&b->mbo_gid_h);
-	CLASSERT(offsetof(typeof(*b), mbo_padding_5) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), mbo_padding_5) == 0);
 }
 
 void lustre_swab_mdt_ioepoch(struct mdt_ioepoch *b)
 {
 	/* handle is opaque */
 	/* mio_handle is opaque */
-	CLASSERT(offsetof(typeof(*b), mio_unused1));
-	CLASSERT(offsetof(typeof(*b), mio_unused2));
-	CLASSERT(offsetof(typeof(*b), mio_padding));
+	BUILD_BUG_ON(!offsetof(typeof(*b), mio_unused1));
+	BUILD_BUG_ON(!offsetof(typeof(*b), mio_unused2));
+	BUILD_BUG_ON(!offsetof(typeof(*b), mio_padding));
 }
 
 void lustre_swab_mgs_target_info(struct mgs_target_info *mti)
@@ -1768,7 +1769,7 @@ void lustre_swab_mgs_target_info(struct mgs_target_info *mti)
 	__swab32s(&mti->mti_flags);
 	__swab32s(&mti->mti_instance);
 	__swab32s(&mti->mti_nid_count);
-	CLASSERT(sizeof(lnet_nid_t) == sizeof(__u64));
+	BUILD_BUG_ON(sizeof(lnet_nid_t) != sizeof(__u64));
 	for (i = 0; i < MTI_NIDS_MAX; i++)
 		__swab64s(&mti->mti_nids[i]);
 }
@@ -1784,13 +1785,13 @@ void lustre_swab_mgs_nidtbl_entry(struct mgs_nidtbl_entry *entry)
 
 	/* mne_nid_(count|type) must be one byte size because we're gonna
 	 * access it w/o swapping. */
-	CLASSERT(sizeof(entry->mne_nid_count) == sizeof(__u8));
-	CLASSERT(sizeof(entry->mne_nid_type) == sizeof(__u8));
+	BUILD_BUG_ON(sizeof(entry->mne_nid_count) != sizeof(__u8));
+	BUILD_BUG_ON(sizeof(entry->mne_nid_type) != sizeof(__u8));
 
 	/* remove this assertion if ipv6 is supported. */
 	LASSERT(entry->mne_nid_type == 0);
 	for (i = 0; i < entry->mne_nid_count; i++) {
-		CLASSERT(sizeof(lnet_nid_t) == sizeof(__u64));
+		BUILD_BUG_ON(sizeof(lnet_nid_t) != sizeof(__u64));
 		__swab64s(&entry->u.nids[i]);
 	}
 }
@@ -1828,7 +1829,7 @@ static void lustre_swab_obd_dqblk(struct obd_dqblk *b)
 	__swab64s(&b->dqb_btime);
 	__swab64s(&b->dqb_itime);
 	__swab32s(&b->dqb_valid);
-	CLASSERT(offsetof(typeof(*b), dqb_padding) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*b), dqb_padding) == 0);
 }
 
 void lustre_swab_obd_quotactl(struct obd_quotactl *q)
@@ -1899,7 +1900,7 @@ void lustre_swab_mdt_rec_reint (struct mdt_rec_reint *rr)
 	__swab32s(&rr->rr_flags_h);
 	__swab32s(&rr->rr_umask);
 
-	CLASSERT(offsetof(typeof(*rr), rr_padding_4) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*rr), rr_padding_4) == 0);
 };
 
 void lustre_swab_lov_desc(struct lov_desc *ld)
@@ -1948,7 +1949,7 @@ void lustre_swab_lmv_user_md(struct lmv_user_md *lum)
 	__swab32s(&lum->lum_stripe_offset);
 	__swab32s(&lum->lum_hash_type);
 	__swab32s(&lum->lum_type);
-	CLASSERT(offsetof(typeof(*lum), lum_padding1));
+	BUILD_BUG_ON(!offsetof(typeof(*lum), lum_padding1));
 }
 EXPORT_SYMBOL(lustre_swab_lmv_user_md);
 
@@ -2037,7 +2038,7 @@ void lustre_swab_ldlm_intent(struct ldlm_intent *i)
 static void lustre_swab_ldlm_resource_desc(struct ldlm_resource_desc *r)
 {
 	__swab32s(&r->lr_type);
-	CLASSERT(offsetof(typeof(*r), lr_padding) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*r), lr_padding) == 0);
 	lustre_swab_ldlm_res_id(&r->lr_name);
 }
 
@@ -2060,7 +2061,7 @@ void lustre_swab_ldlm_request(struct ldlm_request *rq)
 void lustre_swab_ldlm_reply(struct ldlm_reply *r)
 {
 	__swab32s(&r->lock_flags);
-	CLASSERT(offsetof(typeof(*r), lock_padding) != 0);
+	BUILD_BUG_ON(offsetof(typeof(*r), lock_padding) == 0);
 	lustre_swab_ldlm_lock_desc(&r->lock_desc);
 	/* lock_handle opaque */
 	__swab64s(&r->lock_policy_res1);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/pers.c b/drivers/staging/lustre/lustre/ptlrpc/pers.c
index 94e9fa85d774..601acb84f343 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/pers.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/pers.c
@@ -45,7 +45,7 @@ void ptlrpc_fill_bulk_md(lnet_md_t *md, struct ptlrpc_bulk_desc *desc,
 {
 	int offset = mdidx * LNET_MAX_IOV;
 
-	CLASSERT(PTLRPC_MAX_BRW_PAGES < LI_POISON);
+	BUILD_BUG_ON(PTLRPC_MAX_BRW_PAGES >= LI_POISON);
 
 	LASSERT(mdidx < desc->bd_md_max_brw);
 	LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h b/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h
index e0f859ca6223..8e6a805487ec 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h
+++ b/drivers/staging/lustre/lustre/ptlrpc/ptlrpc_internal.h
@@ -226,6 +226,9 @@ struct ptlrpc_nrs_policy *nrs_request_policy(struct ptlrpc_nrs_request *nrq)
  sizeof(NRS_LPROCFS_QUANTUM_NAME_REG __stringify(LPROCFS_NRS_QUANTUM_MAX) " "  \
 	NRS_LPROCFS_QUANTUM_NAME_HP __stringify(LPROCFS_NRS_QUANTUM_MAX))
 
+/* ptlrpc/nrs_fifo.c */
+extern struct ptlrpc_nrs_pol_conf nrs_conf_fifo;
+
 /* recovd_thread.c */
 
 int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c b/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
index 1f55d642aa75..59b5813bd559 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
@@ -82,7 +82,8 @@ struct ptlrpcd {
  */
 static int max_ptlrpcds;
 module_param(max_ptlrpcds, int, 0644);
-MODULE_PARM_DESC(max_ptlrpcds, "Max ptlrpcd thread count to be started.");
+MODULE_PARM_DESC(max_ptlrpcds,
+		 "Max ptlrpcd thread count to be started (obsolete).");
 
 /*
  * ptlrpcd_bind_policy is obsolete, but retained to ensure that
@@ -102,7 +103,7 @@ MODULE_PARM_DESC(ptlrpcd_bind_policy,
 static int ptlrpcd_per_cpt_max;
 module_param(ptlrpcd_per_cpt_max, int, 0644);
 MODULE_PARM_DESC(ptlrpcd_per_cpt_max,
-		 "Max ptlrpcd thread count to be started per cpt.");
+		 "Max ptlrpcd thread count to be started per CPT.");
 
 /*
  * ptlrpcd_partner_group_size: The desired number of threads in each
@@ -562,15 +563,6 @@ int ptlrpcd_start(struct ptlrpcd_ctl *pc)
 		return 0;
 	}
 
-	/*
-	 * So far only "client" ptlrpcd uses an environment. In the future,
-	 * ptlrpcd thread (or a thread-set) has to be given an argument,
-	 * describing its "scope".
-	 */
-	rc = lu_context_init(&pc->pc_env.le_ctx, LCT_CL_THREAD | LCT_REMEMBER);
-	if (rc != 0)
-		goto out;
-
 	task = kthread_run(ptlrpcd, pc, "%s", pc->pc_name);
 	if (IS_ERR(task)) {
 		rc = PTR_ERR(task);
@@ -593,9 +585,6 @@ out_set:
 		spin_unlock(&pc->pc_lock);
 		ptlrpc_set_destroy(set);
 	}
-	lu_context_fini(&pc->pc_env.le_ctx);
-
-out:
 	clear_bit(LIOD_START, &pc->pc_flags);
 	return rc;
 }
@@ -623,7 +612,6 @@ void ptlrpcd_free(struct ptlrpcd_ctl *pc)
 	}
 
 	wait_for_completion(&pc->pc_finishing);
-	lu_context_fini(&pc->pc_env.le_ctx);
 
 	spin_lock(&pc->pc_lock);
 	pc->pc_set = NULL;
diff --git a/drivers/staging/lustre/lustre/ptlrpc/recover.c b/drivers/staging/lustre/lustre/ptlrpc/recover.c
index c00449036884..7b58545c2de4 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/recover.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/recover.c
@@ -78,28 +78,11 @@ int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
 	imp->imp_last_transno_checked = 0;
 	ptlrpc_free_committed(imp);
 	last_transno = imp->imp_last_replay_transno;
-	spin_unlock(&imp->imp_lock);
 
 	CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
 	       imp, obd2cli_tgt(imp->imp_obd),
 	       imp->imp_peer_committed_transno, last_transno);
 
-	/* Do I need to hold a lock across this iteration?  We shouldn't be
-	 * racing with any additions to the list, because we're in recovery
-	 * and are therefore not processing additional requests to add.  Calls
-	 * to ptlrpc_free_committed might commit requests, but nothing "newer"
-	 * than the one we're replaying (it can't be committed until it's
-	 * replayed, and we're doing that here).  l_f_e_safe protects against
-	 * problems with the current request being committed, in the unlikely
-	 * event of that race.  So, in conclusion, I think that it's safe to
-	 * perform this list-walk without the imp_lock held.
-	 *
-	 * But, the {mdc,osc}_replay_open callbacks both iterate
-	 * request lists, and have comments saying they assume the
-	 * imp_lock is being held by ptlrpc_replay, but it's not. it's
-	 * just a little race...
-	 */
-
 	/* Replay all the committed open requests on committed_list first */
 	if (!list_empty(&imp->imp_committed_list)) {
 		tmp = imp->imp_committed_list.prev;
@@ -107,10 +90,6 @@ int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
 
 		/* The last request on committed_list hasn't been replayed */
 		if (req->rq_transno > last_transno) {
-			/* Since the imp_committed_list is immutable before
-			 * all of it's requests being replayed, it's safe to
-			 * use a cursor to accelerate the search
-			 */
 			if (!imp->imp_resend_replay ||
 			    imp->imp_replay_cursor == &imp->imp_committed_list)
 				imp->imp_replay_cursor = imp->imp_replay_cursor->next;
@@ -124,6 +103,7 @@ int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
 					break;
 
 				req = NULL;
+				LASSERT(!list_empty(imp->imp_replay_cursor));
 				imp->imp_replay_cursor =
 					imp->imp_replay_cursor->next;
 			}
@@ -156,7 +136,6 @@ int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
 	if (req && imp->imp_resend_replay)
 		lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
 
-	spin_lock(&imp->imp_lock);
 	/* The resend replay request may have been removed from the
 	 * unreplied list.
 	 */
@@ -221,6 +200,7 @@ int ptlrpc_resend(struct obd_import *imp)
 	}
 	spin_unlock(&imp->imp_lock);
 
+	OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT, 2);
 	return 0;
 }
 
diff --git a/drivers/staging/lustre/lustre/ptlrpc/service.c b/drivers/staging/lustre/lustre/ptlrpc/service.c
index 70c70558e177..b8091c118302 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/service.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/service.c
@@ -1264,20 +1264,15 @@ static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
 		 */
 		if (req->rq_ops->hpreq_check) {
 			rc = req->rq_ops->hpreq_check(req);
-			/**
-			 * XXX: Out of all current
-			 * ptlrpc_hpreq_ops::hpreq_check(), only
-			 * ldlm_cancel_hpreq_check() can return an error code;
-			 * other functions assert in similar places, which seems
-			 * odd. What also does not seem right is that handlers
-			 * for those RPCs do not assert on the same checks, but
-			 * rather handle the error cases. e.g. see
-			 * ost_rw_hpreq_check(), and ost_brw_read(),
-			 * ost_brw_write().
+			if (rc == -ESTALE) {
+				req->rq_status = rc;
+				ptlrpc_error(req);
+			}
+			/** can only return error,
+			 * 0 for normal request,
+			 *  or 1 for high priority request
 			 */
-			if (rc < 0)
-				return rc;
-			LASSERT(rc == 0 || rc == 1);
+			LASSERT(rc <= 1);
 		}
 
 		spin_lock_bh(&req->rq_export->exp_rpc_lock);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/wiretest.c b/drivers/staging/lustre/lustre/ptlrpc/wiretest.c
index a04e36cf6dd4..367f7e24e3da 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/wiretest.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/wiretest.c
@@ -61,7 +61,7 @@ void lustre_assert_wire_constants(void)
 		 MDS_DIR_END_OFF);
 	LASSERTF(DEAD_HANDLE_MAGIC == 0xdeadbeefcafebabeULL, "found 0x%.16llxULL\n",
 		 DEAD_HANDLE_MAGIC);
-	CLASSERT(MTI_NAME_MAXLEN == 64);
+	BUILD_BUG_ON(MTI_NAME_MAXLEN != 64);
 	LASSERTF(OST_REPLY == 0, "found %lld\n",
 		 (long long)OST_REPLY);
 	LASSERTF(OST_GETATTR == 1, "found %lld\n",
@@ -306,16 +306,16 @@ void lustre_assert_wire_constants(void)
 		 (long long)LCK_MAXMODE);
 	LASSERTF(LCK_MODE_NUM == 8, "found %lld\n",
 		 (long long)LCK_MODE_NUM);
-	CLASSERT(LDLM_PLAIN == 10);
-	CLASSERT(LDLM_EXTENT == 11);
-	CLASSERT(LDLM_FLOCK == 12);
-	CLASSERT(LDLM_IBITS == 13);
-	CLASSERT(LDLM_MAX_TYPE == 14);
-	CLASSERT(LUSTRE_RES_ID_SEQ_OFF == 0);
-	CLASSERT(LUSTRE_RES_ID_VER_OID_OFF == 1);
-	CLASSERT(LUSTRE_RES_ID_QUOTA_SEQ_OFF == 2);
-	CLASSERT(LUSTRE_RES_ID_QUOTA_VER_OID_OFF == 3);
-	CLASSERT(LUSTRE_RES_ID_HSH_OFF == 3);
+	BUILD_BUG_ON(LDLM_PLAIN != 10);
+	BUILD_BUG_ON(LDLM_EXTENT != 11);
+	BUILD_BUG_ON(LDLM_FLOCK != 12);
+	BUILD_BUG_ON(LDLM_IBITS != 13);
+	BUILD_BUG_ON(LDLM_MAX_TYPE != 14);
+	BUILD_BUG_ON(LUSTRE_RES_ID_SEQ_OFF != 0);
+	BUILD_BUG_ON(LUSTRE_RES_ID_VER_OID_OFF != 1);
+	BUILD_BUG_ON(LUSTRE_RES_ID_QUOTA_SEQ_OFF != 2);
+	BUILD_BUG_ON(LUSTRE_RES_ID_QUOTA_VER_OID_OFF != 3);
+	BUILD_BUG_ON(LUSTRE_RES_ID_HSH_OFF != 3);
 	LASSERTF(OBD_PING == 400, "found %lld\n",
 		 (long long)OBD_PING);
 	LASSERTF(OBD_LOG_CANCEL == 401, "found %lld\n",
@@ -661,7 +661,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct ptlrpc_body_v3, pb_slv));
 	LASSERTF((int)sizeof(((struct ptlrpc_body_v3 *)0)->pb_slv) == 8, "found %lld\n",
 		 (long long)(int)sizeof(((struct ptlrpc_body_v3 *)0)->pb_slv));
-	CLASSERT(PTLRPC_NUM_VERSIONS == 4);
+	BUILD_BUG_ON(PTLRPC_NUM_VERSIONS != 4);
 	LASSERTF((int)offsetof(struct ptlrpc_body_v3, pb_pre_versions) == 88, "found %lld\n",
 		 (long long)(int)offsetof(struct ptlrpc_body_v3, pb_pre_versions));
 	LASSERTF((int)sizeof(((struct ptlrpc_body_v3 *)0)->pb_pre_versions) == 32, "found %lld\n",
@@ -682,7 +682,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct ptlrpc_body_v3, pb_padding64_2));
 	LASSERTF((int)sizeof(((struct ptlrpc_body_v3 *)0)->pb_padding64_2) == 8, "found %lld\n",
 		 (long long)(int)sizeof(((struct ptlrpc_body_v3 *)0)->pb_padding64_2));
-	CLASSERT(LUSTRE_JOBID_SIZE == 32);
+	BUILD_BUG_ON(LUSTRE_JOBID_SIZE != 32);
 	LASSERTF((int)offsetof(struct ptlrpc_body_v3, pb_jobid) == 152, "found %lld\n",
 		 (long long)(int)offsetof(struct ptlrpc_body_v3, pb_jobid));
 	LASSERTF((int)sizeof(((struct ptlrpc_body_v3 *)0)->pb_jobid) == 32, "found %lld\n",
@@ -1319,27 +1319,27 @@ void lustre_assert_wire_constants(void)
 		 OBD_MD_FLGETATTRLOCK);
 	LASSERTF(OBD_MD_FLDATAVERSION == (0x0010000000000000ULL), "found 0x%.16llxULL\n",
 		 OBD_MD_FLDATAVERSION);
-	CLASSERT(OBD_FL_INLINEDATA == 0x00000001);
-	CLASSERT(OBD_FL_OBDMDEXISTS == 0x00000002);
-	CLASSERT(OBD_FL_DELORPHAN == 0x00000004);
-	CLASSERT(OBD_FL_NORPC == 0x00000008);
-	CLASSERT(OBD_FL_IDONLY == 0x00000010);
-	CLASSERT(OBD_FL_RECREATE_OBJS == 0x00000020);
-	CLASSERT(OBD_FL_DEBUG_CHECK == 0x00000040);
-	CLASSERT(OBD_FL_NO_USRQUOTA == 0x00000100);
-	CLASSERT(OBD_FL_NO_GRPQUOTA == 0x00000200);
-	CLASSERT(OBD_FL_CREATE_CROW == 0x00000400);
-	CLASSERT(OBD_FL_SRVLOCK == 0x00000800);
-	CLASSERT(OBD_FL_CKSUM_CRC32 == 0x00001000);
-	CLASSERT(OBD_FL_CKSUM_ADLER == 0x00002000);
-	CLASSERT(OBD_FL_CKSUM_CRC32C == 0x00004000);
-	CLASSERT(OBD_FL_CKSUM_RSVD2 == 0x00008000);
-	CLASSERT(OBD_FL_CKSUM_RSVD3 == 0x00010000);
-	CLASSERT(OBD_FL_SHRINK_GRANT == 0x00020000);
-	CLASSERT(OBD_FL_MMAP == 0x00040000);
-	CLASSERT(OBD_FL_RECOV_RESEND == 0x00080000);
-	CLASSERT(OBD_FL_NOSPC_BLK == 0x00100000);
-	CLASSERT(OBD_FL_LOCAL_MASK == 0xf0000000);
+	BUILD_BUG_ON(OBD_FL_INLINEDATA != 0x00000001);
+	BUILD_BUG_ON(OBD_FL_OBDMDEXISTS != 0x00000002);
+	BUILD_BUG_ON(OBD_FL_DELORPHAN != 0x00000004);
+	BUILD_BUG_ON(OBD_FL_NORPC != 0x00000008);
+	BUILD_BUG_ON(OBD_FL_IDONLY != 0x00000010);
+	BUILD_BUG_ON(OBD_FL_RECREATE_OBJS != 0x00000020);
+	BUILD_BUG_ON(OBD_FL_DEBUG_CHECK != 0x00000040);
+	BUILD_BUG_ON(OBD_FL_NO_USRQUOTA != 0x00000100);
+	BUILD_BUG_ON(OBD_FL_NO_GRPQUOTA != 0x00000200);
+	BUILD_BUG_ON(OBD_FL_CREATE_CROW != 0x00000400);
+	BUILD_BUG_ON(OBD_FL_SRVLOCK != 0x00000800);
+	BUILD_BUG_ON(OBD_FL_CKSUM_CRC32 != 0x00001000);
+	BUILD_BUG_ON(OBD_FL_CKSUM_ADLER != 0x00002000);
+	BUILD_BUG_ON(OBD_FL_CKSUM_CRC32C != 0x00004000);
+	BUILD_BUG_ON(OBD_FL_CKSUM_RSVD2 != 0x00008000);
+	BUILD_BUG_ON(OBD_FL_CKSUM_RSVD3 != 0x00010000);
+	BUILD_BUG_ON(OBD_FL_SHRINK_GRANT != 0x00020000);
+	BUILD_BUG_ON(OBD_FL_MMAP != 0x00040000);
+	BUILD_BUG_ON(OBD_FL_RECOV_RESEND != 0x00080000);
+	BUILD_BUG_ON(OBD_FL_NOSPC_BLK != 0x00100000);
+	BUILD_BUG_ON(OBD_FL_LOCAL_MASK != 0xf0000000);
 
 	/* Checks for struct lov_ost_data_v1 */
 	LASSERTF((int)sizeof(struct lov_ost_data_v1) == 24, "found %lld\n",
@@ -1388,7 +1388,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lov_mds_md_v1, lmm_objects[0]));
 	LASSERTF((int)sizeof(((struct lov_mds_md_v1 *)0)->lmm_objects[0]) == 24, "found %lld\n",
 		 (long long)(int)sizeof(((struct lov_mds_md_v1 *)0)->lmm_objects[0]));
-	CLASSERT(LOV_MAGIC_V1 == (0x0BD10000 | 0x0BD0));
+	BUILD_BUG_ON(LOV_MAGIC_V1 != (0x0BD10000 | 0x0BD0));
 
 	/* Checks for struct lov_mds_md_v3 */
 	LASSERTF((int)sizeof(struct lov_mds_md_v3) == 48, "found %lld\n",
@@ -1417,7 +1417,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lov_mds_md_v3, lmm_layout_gen));
 	LASSERTF((int)sizeof(((struct lov_mds_md_v3 *)0)->lmm_layout_gen) == 2, "found %lld\n",
 		 (long long)(int)sizeof(((struct lov_mds_md_v3 *)0)->lmm_layout_gen));
-	CLASSERT(LOV_MAXPOOLNAME == 15);
+	BUILD_BUG_ON(LOV_MAXPOOLNAME != 15);
 	LASSERTF((int)offsetof(struct lov_mds_md_v3, lmm_pool_name[16]) == 48, "found %lld\n",
 		 (long long)(int)offsetof(struct lov_mds_md_v3, lmm_pool_name[16]));
 	LASSERTF((int)sizeof(((struct lov_mds_md_v3 *)0)->lmm_pool_name[16]) == 1, "found %lld\n",
@@ -1426,7 +1426,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lov_mds_md_v3, lmm_objects[0]));
 	LASSERTF((int)sizeof(((struct lov_mds_md_v3 *)0)->lmm_objects[0]) == 24, "found %lld\n",
 		 (long long)(int)sizeof(((struct lov_mds_md_v3 *)0)->lmm_objects[0]));
-	CLASSERT(LOV_MAGIC_V3 == (0x0BD30000 | 0x0BD0));
+	BUILD_BUG_ON(LOV_MAGIC_V3 != (0x0BD30000 | 0x0BD0));
 	LASSERTF(LOV_PATTERN_RAID0 == 0x00000001UL, "found 0x%.8xUL\n",
 		 (unsigned int)LOV_PATTERN_RAID0);
 	LASSERTF(LOV_PATTERN_RAID1 == 0x00000002UL, "found 0x%.8xUL\n",
@@ -1479,11 +1479,11 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lmv_mds_md_v1, lmv_stripe_fids[0]));
 	LASSERTF((int)sizeof(((struct lmv_mds_md_v1 *)0)->lmv_stripe_fids[0]) == 16, "found %lld\n",
 		 (long long)(int)sizeof(((struct lmv_mds_md_v1 *)0)->lmv_stripe_fids[0]));
-	CLASSERT(LMV_MAGIC_V1 == 0x0CD20CD0);
-	CLASSERT(LMV_MAGIC_STRIPE == 0x0CD40CD0);
-	CLASSERT(LMV_HASH_TYPE_MASK == 0x0000ffff);
-	CLASSERT(LMV_HASH_FLAG_MIGRATION == 0x80000000);
-	CLASSERT(LMV_HASH_FLAG_DEAD == 0x40000000);
+	BUILD_BUG_ON(LMV_MAGIC_V1 != 0x0CD20CD0);
+	BUILD_BUG_ON(LMV_MAGIC_STRIPE != 0x0CD40CD0);
+	BUILD_BUG_ON(LMV_HASH_TYPE_MASK != 0x0000ffff);
+	BUILD_BUG_ON(LMV_HASH_FLAG_MIGRATION != 0x80000000);
+	BUILD_BUG_ON(LMV_HASH_FLAG_DEAD != 0x40000000);
 
 	/* Checks for struct obd_statfs */
 	LASSERTF((int)sizeof(struct obd_statfs) == 144, "found %lld\n",
@@ -2761,12 +2761,12 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lov_desc, ld_uuid));
 	LASSERTF((int)sizeof(((struct lov_desc *)0)->ld_uuid) == 40, "found %lld\n",
 		 (long long)(int)sizeof(((struct lov_desc *)0)->ld_uuid));
-	CLASSERT(LOV_DESC_MAGIC == 0xB0CCDE5C);
+	BUILD_BUG_ON(LOV_DESC_MAGIC != 0xB0CCDE5C);
 
 	/* Checks for struct ldlm_res_id */
 	LASSERTF((int)sizeof(struct ldlm_res_id) == 32, "found %lld\n",
 		 (long long)(int)sizeof(struct ldlm_res_id));
-	CLASSERT(RES_NAME_SIZE == 4);
+	BUILD_BUG_ON(RES_NAME_SIZE != 4);
 	LASSERTF((int)offsetof(struct ldlm_res_id, name[4]) == 32, "found %lld\n",
 		 (long long)(int)offsetof(struct ldlm_res_id, name[4]));
 	LASSERTF((int)sizeof(((struct ldlm_res_id *)0)->name[4]) == 8, "found %lld\n",
@@ -3037,7 +3037,7 @@ void lustre_assert_wire_constants(void)
 	/* Checks for struct mgs_send_param */
 	LASSERTF((int)sizeof(struct mgs_send_param) == 1024, "found %lld\n",
 		 (long long)(int)sizeof(struct mgs_send_param));
-	CLASSERT(MGS_PARAM_MAXLEN == 1024);
+	BUILD_BUG_ON(MGS_PARAM_MAXLEN != 1024);
 	LASSERTF((int)offsetof(struct mgs_send_param, mgs_param[1024]) == 1024, "found %lld\n",
 		 (long long)(int)offsetof(struct mgs_send_param, mgs_param[1024]));
 	LASSERTF((int)sizeof(((struct mgs_send_param *)0)->mgs_param[1024]) == 1, "found %lld\n",
@@ -3090,16 +3090,16 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct llog_logid, lgl_ogen));
 	LASSERTF((int)sizeof(((struct llog_logid *)0)->lgl_ogen) == 4, "found %lld\n",
 		 (long long)(int)sizeof(((struct llog_logid *)0)->lgl_ogen));
-	CLASSERT(OST_SZ_REC == 274730752);
-	CLASSERT(MDS_UNLINK_REC == 274801668);
-	CLASSERT(MDS_UNLINK64_REC == 275325956);
-	CLASSERT(MDS_SETATTR64_REC == 275325953);
-	CLASSERT(OBD_CFG_REC == 274857984);
-	CLASSERT(LLOG_GEN_REC == 274989056);
-	CLASSERT(CHANGELOG_REC == 275120128);
-	CLASSERT(CHANGELOG_USER_REC == 275185664);
-	CLASSERT(LLOG_HDR_MAGIC == 275010873);
-	CLASSERT(LLOG_LOGID_MAGIC == 275010875);
+	BUILD_BUG_ON(OST_SZ_REC != 274730752);
+	BUILD_BUG_ON(MDS_UNLINK_REC != 274801668);
+	BUILD_BUG_ON(MDS_UNLINK64_REC != 275325956);
+	BUILD_BUG_ON(MDS_SETATTR64_REC != 275325953);
+	BUILD_BUG_ON(OBD_CFG_REC != 274857984);
+	BUILD_BUG_ON(LLOG_GEN_REC != 274989056);
+	BUILD_BUG_ON(CHANGELOG_REC != 275120128);
+	BUILD_BUG_ON(CHANGELOG_USER_REC != 275185664);
+	BUILD_BUG_ON(LLOG_HDR_MAGIC != 275010873);
+	BUILD_BUG_ON(LLOG_LOGID_MAGIC != 275010875);
 
 	/* Checks for struct llog_catid */
 	LASSERTF((int)sizeof(struct llog_catid) == 32, "found %lld\n",
@@ -3519,30 +3519,30 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct llogd_body, lgd_cur_offset));
 	LASSERTF((int)sizeof(((struct llogd_body *)0)->lgd_cur_offset) == 8, "found %lld\n",
 		 (long long)(int)sizeof(((struct llogd_body *)0)->lgd_cur_offset));
-	CLASSERT(LLOG_ORIGIN_HANDLE_CREATE == 501);
-	CLASSERT(LLOG_ORIGIN_HANDLE_NEXT_BLOCK == 502);
-	CLASSERT(LLOG_ORIGIN_HANDLE_READ_HEADER == 503);
-	CLASSERT(LLOG_ORIGIN_HANDLE_WRITE_REC == 504);
-	CLASSERT(LLOG_ORIGIN_HANDLE_CLOSE == 505);
-	CLASSERT(LLOG_ORIGIN_CONNECT == 506);
-	CLASSERT(LLOG_CATINFO == 507);
-	CLASSERT(LLOG_ORIGIN_HANDLE_PREV_BLOCK == 508);
-	CLASSERT(LLOG_ORIGIN_HANDLE_DESTROY == 509);
-	CLASSERT(LLOG_FIRST_OPC == 501);
-	CLASSERT(LLOG_LAST_OPC == 510);
-	CLASSERT(LLOG_CONFIG_ORIG_CTXT == 0);
-	CLASSERT(LLOG_CONFIG_REPL_CTXT == 1);
-	CLASSERT(LLOG_MDS_OST_ORIG_CTXT == 2);
-	CLASSERT(LLOG_MDS_OST_REPL_CTXT == 3);
-	CLASSERT(LLOG_SIZE_ORIG_CTXT == 4);
-	CLASSERT(LLOG_SIZE_REPL_CTXT == 5);
-	CLASSERT(LLOG_TEST_ORIG_CTXT == 8);
-	CLASSERT(LLOG_TEST_REPL_CTXT == 9);
-	CLASSERT(LLOG_CHANGELOG_ORIG_CTXT == 12);
-	CLASSERT(LLOG_CHANGELOG_REPL_CTXT == 13);
-	CLASSERT(LLOG_CHANGELOG_USER_ORIG_CTXT == 14);
-	CLASSERT(LLOG_AGENT_ORIG_CTXT == 15);
-	CLASSERT(LLOG_MAX_CTXTS == 16);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_CREATE != 501);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_NEXT_BLOCK != 502);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_READ_HEADER != 503);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_WRITE_REC != 504);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_CLOSE != 505);
+	BUILD_BUG_ON(LLOG_ORIGIN_CONNECT != 506);
+	BUILD_BUG_ON(LLOG_CATINFO != 507);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_PREV_BLOCK != 508);
+	BUILD_BUG_ON(LLOG_ORIGIN_HANDLE_DESTROY != 509);
+	BUILD_BUG_ON(LLOG_FIRST_OPC != 501);
+	BUILD_BUG_ON(LLOG_LAST_OPC != 510);
+	BUILD_BUG_ON(LLOG_CONFIG_ORIG_CTXT != 0);
+	BUILD_BUG_ON(LLOG_CONFIG_REPL_CTXT != 1);
+	BUILD_BUG_ON(LLOG_MDS_OST_ORIG_CTXT != 2);
+	BUILD_BUG_ON(LLOG_MDS_OST_REPL_CTXT != 3);
+	BUILD_BUG_ON(LLOG_SIZE_ORIG_CTXT != 4);
+	BUILD_BUG_ON(LLOG_SIZE_REPL_CTXT != 5);
+	BUILD_BUG_ON(LLOG_TEST_ORIG_CTXT != 8);
+	BUILD_BUG_ON(LLOG_TEST_REPL_CTXT != 9);
+	BUILD_BUG_ON(LLOG_CHANGELOG_ORIG_CTXT != 12);
+	BUILD_BUG_ON(LLOG_CHANGELOG_REPL_CTXT != 13);
+	BUILD_BUG_ON(LLOG_CHANGELOG_USER_ORIG_CTXT != 14);
+	BUILD_BUG_ON(LLOG_AGENT_ORIG_CTXT != 15);
+	BUILD_BUG_ON(LLOG_MAX_CTXTS != 16);
 
 	/* Checks for struct llogd_conn_body */
 	LASSERTF((int)sizeof(struct llogd_conn_body) == 40, "found %lld\n",
@@ -3659,7 +3659,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lustre_capa, lc_expiry));
 	LASSERTF((int)sizeof(((struct lustre_capa *)0)->lc_expiry) == 4, "found %lld\n",
 		 (long long)(int)sizeof(((struct lustre_capa *)0)->lc_expiry));
-	CLASSERT(CAPA_HMAC_MAX_LEN == 64);
+	BUILD_BUG_ON(CAPA_HMAC_MAX_LEN != 64);
 	LASSERTF((int)offsetof(struct lustre_capa, lc_hmac[64]) == 120, "found %lld\n",
 		 (long long)(int)offsetof(struct lustre_capa, lc_hmac[64]));
 	LASSERTF((int)sizeof(((struct lustre_capa *)0)->lc_hmac[64]) == 1, "found %lld\n",
@@ -3680,7 +3680,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct lustre_capa_key, lk_padding));
 	LASSERTF((int)sizeof(((struct lustre_capa_key *)0)->lk_padding) == 4, "found %lld\n",
 		 (long long)(int)sizeof(((struct lustre_capa_key *)0)->lk_padding));
-	CLASSERT(CAPA_HMAC_KEY_MAX_LEN == 56);
+	BUILD_BUG_ON(CAPA_HMAC_KEY_MAX_LEN != 56);
 	LASSERTF((int)offsetof(struct lustre_capa_key, lk_key[56]) == 72, "found %lld\n",
 		 (long long)(int)offsetof(struct lustre_capa_key, lk_key[56]));
 	LASSERTF((int)sizeof(((struct lustre_capa_key *)0)->lk_key[56]) == 1, "found %lld\n",
@@ -3741,9 +3741,9 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct fiemap, fm_extents));
 	LASSERTF((int)sizeof(((struct fiemap *)0)->fm_extents) == 0, "found %lld\n",
 		 (long long)(int)sizeof(((struct fiemap *)0)->fm_extents));
-	CLASSERT(FIEMAP_FLAG_SYNC == 0x00000001);
-	CLASSERT(FIEMAP_FLAG_XATTR == 0x00000002);
-	CLASSERT(FIEMAP_FLAG_DEVICE_ORDER == 0x40000000);
+	BUILD_BUG_ON(FIEMAP_FLAG_SYNC != 0x00000001);
+	BUILD_BUG_ON(FIEMAP_FLAG_XATTR != 0x00000002);
+	BUILD_BUG_ON(FIEMAP_FLAG_DEVICE_ORDER != 0x40000000);
 
 	/* Checks for struct fiemap_extent */
 	LASSERTF((int)sizeof(struct fiemap_extent) == 56, "found %lld\n",
@@ -3768,18 +3768,18 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct fiemap_extent, fe_reserved[0]));
 	LASSERTF((int)sizeof(((struct fiemap_extent *)0)->fe_reserved[0]) == 4, "found %lld\n",
 		 (long long)(int)sizeof(((struct fiemap_extent *)0)->fe_reserved[0]));
-	CLASSERT(FIEMAP_EXTENT_LAST == 0x00000001);
-	CLASSERT(FIEMAP_EXTENT_UNKNOWN == 0x00000002);
-	CLASSERT(FIEMAP_EXTENT_DELALLOC == 0x00000004);
-	CLASSERT(FIEMAP_EXTENT_ENCODED == 0x00000008);
-	CLASSERT(FIEMAP_EXTENT_DATA_ENCRYPTED == 0x00000080);
-	CLASSERT(FIEMAP_EXTENT_NOT_ALIGNED == 0x00000100);
-	CLASSERT(FIEMAP_EXTENT_DATA_INLINE == 0x00000200);
-	CLASSERT(FIEMAP_EXTENT_DATA_TAIL == 0x00000400);
-	CLASSERT(FIEMAP_EXTENT_UNWRITTEN == 0x00000800);
-	CLASSERT(FIEMAP_EXTENT_MERGED == 0x00001000);
-	CLASSERT(FIEMAP_EXTENT_NO_DIRECT == 0x40000000);
-	CLASSERT(FIEMAP_EXTENT_NET == 0x80000000);
+	BUILD_BUG_ON(FIEMAP_EXTENT_LAST != 0x00000001);
+	BUILD_BUG_ON(FIEMAP_EXTENT_UNKNOWN != 0x00000002);
+	BUILD_BUG_ON(FIEMAP_EXTENT_DELALLOC != 0x00000004);
+	BUILD_BUG_ON(FIEMAP_EXTENT_ENCODED != 0x00000008);
+	BUILD_BUG_ON(FIEMAP_EXTENT_DATA_ENCRYPTED != 0x00000080);
+	BUILD_BUG_ON(FIEMAP_EXTENT_NOT_ALIGNED != 0x00000100);
+	BUILD_BUG_ON(FIEMAP_EXTENT_DATA_INLINE != 0x00000200);
+	BUILD_BUG_ON(FIEMAP_EXTENT_DATA_TAIL != 0x00000400);
+	BUILD_BUG_ON(FIEMAP_EXTENT_UNWRITTEN != 0x00000800);
+	BUILD_BUG_ON(FIEMAP_EXTENT_MERGED != 0x00001000);
+	BUILD_BUG_ON(FIEMAP_EXTENT_NO_DIRECT != 0x40000000);
+	BUILD_BUG_ON(FIEMAP_EXTENT_NET != 0x80000000);
 
 	/* Checks for type posix_acl_xattr_entry */
 	LASSERTF((int)sizeof(struct posix_acl_xattr_entry) == 8, "found %lld\n",
@@ -3828,7 +3828,7 @@ void lustre_assert_wire_constants(void)
 		 (long long)(int)offsetof(struct link_ea_header, padding2));
 	LASSERTF((int)sizeof(((struct link_ea_header *)0)->padding2) == 4, "found %lld\n",
 		 (long long)(int)sizeof(((struct link_ea_header *)0)->padding2));
-	CLASSERT(LINK_EA_MAGIC == 0x11EAF1DFUL);
+	BUILD_BUG_ON(LINK_EA_MAGIC != 0x11EAF1DFUL);
 
 	/* Checks for struct link_ea_entry */
 	LASSERTF((int)sizeof(struct link_ea_entry) == 18, "found %lld\n",
author	Linus Torvalds <torvalds@linux-foundation.org>	2017-02-22 12:14:01 -0800
committer	Linus Torvalds <torvalds@linux-foundation.org>	2017-02-22 12:14:01 -0800
commit	caa59428971d5ad81d19512365c9ba580d83268c (patch)
tree	cd9615719bad9a97f02bb5bc1021396a1b484762 /drivers/staging/lustre/lustre
parent	Merge tag 'driver-core-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core (diff)
parent	Staging: vc04_services: Fix the "space prohibited" code style errors (diff)
download	linux-dev-caa59428971d5ad81d19512365c9ba580d83268c.tar.xz linux-dev-caa59428971d5ad81d19512365c9ba580d83268c.zip