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diff --git a/kernel/drivers/staging/lustre/lustre/llite/llite_capa.c b/kernel/drivers/staging/lustre/lustre/llite/llite_capa.c
new file mode 100644
index 000000000..aec9a4412
--- /dev/null
+++ b/kernel/drivers/staging/lustre/lustre/llite/llite_capa.c
@@ -0,0 +1,654 @@
+/*
+ * 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.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/llite/llite_capa.c
+ *
+ * Author: Lai Siyao <lsy@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/file.h>
+#include <linux/kmod.h>
+
+#include "../include/lustre_lite.h"
+#include "llite_internal.h"
+
+/* for obd_capa.c_list, client capa might stay in three places:
+ * 1. ll_capa_list.
+ * 2. ll_idle_capas.
+ * 3. stand alone: just allocated.
+ */
+
+/* capas for oss writeback and those failed to renew */
+static LIST_HEAD(ll_idle_capas);
+static struct ptlrpc_thread ll_capa_thread;
+static struct list_head *ll_capa_list = &capa_list[CAPA_SITE_CLIENT];
+
+/* llite capa renewal timer */
+struct timer_list ll_capa_timer;
+/* for debug: indicate whether capa on llite is enabled or not */
+static atomic_t ll_capa_debug = ATOMIC_INIT(0);
+static unsigned long long ll_capa_renewed;
+static unsigned long long ll_capa_renewal_noent;
+static unsigned long long ll_capa_renewal_failed;
+static unsigned long long ll_capa_renewal_retries;
+
+static int ll_update_capa(struct obd_capa *ocapa, struct lustre_capa *capa);
+
+static inline void update_capa_timer(struct obd_capa *ocapa, unsigned long expiry)
+{
+	if (time_before(expiry, ll_capa_timer.expires) ||
+	    !timer_pending(&ll_capa_timer)) {
+		mod_timer(&ll_capa_timer, expiry);
+		DEBUG_CAPA(D_SEC, &ocapa->c_capa,
+			   "ll_capa_timer update: %lu/%lu by", expiry, jiffies);
+	}
+}
+
+static inline unsigned long capa_renewal_time(struct obd_capa *ocapa)
+{
+	return cfs_time_sub(ocapa->c_expiry,
+			    cfs_time_seconds(ocapa->c_capa.lc_timeout) / 2);
+}
+
+static inline int capa_is_to_expire(struct obd_capa *ocapa)
+{
+	return time_before_eq(capa_renewal_time(ocapa), cfs_time_current());
+}
+
+static inline int have_expired_capa(void)
+{
+	struct obd_capa *ocapa = NULL;
+	int expired = 0;
+
+	/* if ll_capa_list has client capa to expire or ll_idle_capas has
+	 * expired capa, return 1.
+	 */
+	spin_lock(&capa_lock);
+	if (!list_empty(ll_capa_list)) {
+		ocapa = list_entry(ll_capa_list->next, struct obd_capa,
+				       c_list);
+		expired = capa_is_to_expire(ocapa);
+		if (!expired)
+			update_capa_timer(ocapa, capa_renewal_time(ocapa));
+	} else if (!list_empty(&ll_idle_capas)) {
+		ocapa = list_entry(ll_idle_capas.next, struct obd_capa,
+				       c_list);
+		expired = capa_is_expired(ocapa);
+		if (!expired)
+			update_capa_timer(ocapa, ocapa->c_expiry);
+	}
+	spin_unlock(&capa_lock);
+
+	if (expired)
+		DEBUG_CAPA(D_SEC, &ocapa->c_capa, "expired");
+	return expired;
+}
+
+static void sort_add_capa(struct obd_capa *ocapa, struct list_head *head)
+{
+	struct obd_capa *tmp;
+	struct list_head *before = NULL;
+
+	/* TODO: client capa is sorted by expiry, this could be optimized */
+	list_for_each_entry_reverse(tmp, head, c_list) {
+		if (cfs_time_aftereq(ocapa->c_expiry, tmp->c_expiry)) {
+			before = &tmp->c_list;
+			break;
+		}
+	}
+
+	LASSERT(&ocapa->c_list != before);
+	list_add(&ocapa->c_list, before ?: head);
+}
+
+static inline int obd_capa_open_count(struct obd_capa *oc)
+{
+	struct ll_inode_info *lli = ll_i2info(oc->u.cli.inode);
+	return atomic_read(&lli->lli_open_count);
+}
+
+static void ll_delete_capa(struct obd_capa *ocapa)
+{
+	struct ll_inode_info *lli = ll_i2info(ocapa->u.cli.inode);
+
+	if (capa_for_mds(&ocapa->c_capa)) {
+		LASSERT(lli->lli_mds_capa == ocapa);
+		lli->lli_mds_capa = NULL;
+	} else if (capa_for_oss(&ocapa->c_capa)) {
+		list_del_init(&ocapa->u.cli.lli_list);
+	}
+
+	DEBUG_CAPA(D_SEC, &ocapa->c_capa, "free client");
+	list_del_init(&ocapa->c_list);
+	capa_count[CAPA_SITE_CLIENT]--;
+	/* release the ref when alloc */
+	capa_put(ocapa);
+}
+
+/* three places where client capa is deleted:
+ * 1. capa_thread_main(), main place to delete expired capa.
+ * 2. ll_clear_inode_capas() in ll_clear_inode().
+ * 3. ll_truncate_free_capa() delete truncate capa explicitly in ll_setattr_ost().
+ */
+static int capa_thread_main(void *unused)
+{
+	struct obd_capa *ocapa, *tmp, *next;
+	struct inode *inode = NULL;
+	struct l_wait_info lwi = { 0 };
+	int rc;
+
+	thread_set_flags(&ll_capa_thread, SVC_RUNNING);
+	wake_up(&ll_capa_thread.t_ctl_waitq);
+
+	while (1) {
+		l_wait_event(ll_capa_thread.t_ctl_waitq,
+			     !thread_is_running(&ll_capa_thread) ||
+			     have_expired_capa(),
+			     &lwi);
+
+		if (!thread_is_running(&ll_capa_thread))
+			break;
+
+		next = NULL;
+
+		spin_lock(&capa_lock);
+		list_for_each_entry_safe(ocapa, tmp, ll_capa_list, c_list) {
+			__u64 ibits;
+
+			LASSERT(ocapa->c_capa.lc_opc != CAPA_OPC_OSS_TRUNC);
+
+			if (!capa_is_to_expire(ocapa)) {
+				next = ocapa;
+				break;
+			}
+
+			list_del_init(&ocapa->c_list);
+
+			/* for MDS capability, only renew those which belong to
+			 * dir, or its inode is opened, or client holds LOOKUP
+			 * lock.
+			 */
+			/* ibits may be changed by ll_have_md_lock() so we have
+			 * to set it each time */
+			ibits = MDS_INODELOCK_LOOKUP;
+			if (capa_for_mds(&ocapa->c_capa) &&
+			    !S_ISDIR(ocapa->u.cli.inode->i_mode) &&
+			    obd_capa_open_count(ocapa) == 0 &&
+			    !ll_have_md_lock(ocapa->u.cli.inode,
+					     &ibits, LCK_MINMODE)) {
+				DEBUG_CAPA(D_SEC, &ocapa->c_capa,
+					   "skip renewal for");
+				sort_add_capa(ocapa, &ll_idle_capas);
+				continue;
+			}
+
+			/* for OSS capability, only renew those whose inode is
+			 * opened.
+			 */
+			if (capa_for_oss(&ocapa->c_capa) &&
+			    obd_capa_open_count(ocapa) == 0) {
+				/* oss capa with open count == 0 won't renew,
+				 * move to idle list */
+				sort_add_capa(ocapa, &ll_idle_capas);
+				continue;
+			}
+
+			/* NB iput() is in ll_update_capa() */
+			inode = igrab(ocapa->u.cli.inode);
+			if (inode == NULL) {
+				DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
+					   "igrab failed for");
+				continue;
+			}
+
+			capa_get(ocapa);
+			ll_capa_renewed++;
+			spin_unlock(&capa_lock);
+			rc = md_renew_capa(ll_i2mdexp(inode), ocapa,
+					   ll_update_capa);
+			spin_lock(&capa_lock);
+			if (rc) {
+				DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
+					   "renew failed: %d", rc);
+				ll_capa_renewal_failed++;
+			}
+		}
+
+		if (next)
+			update_capa_timer(next, capa_renewal_time(next));
+
+		list_for_each_entry_safe(ocapa, tmp, &ll_idle_capas,
+					     c_list) {
+			if (!capa_is_expired(ocapa)) {
+				if (!next)
+					update_capa_timer(ocapa,
+							  ocapa->c_expiry);
+				break;
+			}
+
+			if (atomic_read(&ocapa->c_refc) > 1) {
+				DEBUG_CAPA(D_SEC, &ocapa->c_capa,
+					   "expired(c_refc %d), don't release",
+					   atomic_read(&ocapa->c_refc));
+				/* don't try to renew any more */
+				list_del_init(&ocapa->c_list);
+				continue;
+			}
+
+			/* expired capa is released. */
+			DEBUG_CAPA(D_SEC, &ocapa->c_capa, "release expired");
+			ll_delete_capa(ocapa);
+		}
+
+		spin_unlock(&capa_lock);
+	}
+
+	thread_set_flags(&ll_capa_thread, SVC_STOPPED);
+	wake_up(&ll_capa_thread.t_ctl_waitq);
+	return 0;
+}
+
+void ll_capa_timer_callback(unsigned long unused)
+{
+	wake_up(&ll_capa_thread.t_ctl_waitq);
+}
+
+int ll_capa_thread_start(void)
+{
+	struct task_struct *task;
+
+	init_waitqueue_head(&ll_capa_thread.t_ctl_waitq);
+
+	task = kthread_run(capa_thread_main, NULL, "ll_capa");
+	if (IS_ERR(task)) {
+		CERROR("cannot start expired capa thread: rc %ld\n",
+			PTR_ERR(task));
+		return PTR_ERR(task);
+	}
+	wait_event(ll_capa_thread.t_ctl_waitq,
+		       thread_is_running(&ll_capa_thread));
+
+	return 0;
+}
+
+void ll_capa_thread_stop(void)
+{
+	thread_set_flags(&ll_capa_thread, SVC_STOPPING);
+	wake_up(&ll_capa_thread.t_ctl_waitq);
+	wait_event(ll_capa_thread.t_ctl_waitq,
+		       thread_is_stopped(&ll_capa_thread));
+}
+
+struct obd_capa *ll_osscapa_get(struct inode *inode, __u64 opc)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+	struct obd_capa *ocapa;
+	int found = 0;
+
+	if ((ll_i2sbi(inode)->ll_flags & LL_SBI_OSS_CAPA) == 0)
+		return NULL;
+
+	LASSERT(opc == CAPA_OPC_OSS_WRITE || opc == CAPA_OPC_OSS_RW ||
+		opc == CAPA_OPC_OSS_TRUNC);
+
+	spin_lock(&capa_lock);
+	list_for_each_entry(ocapa, &lli->lli_oss_capas, u.cli.lli_list) {
+		if (capa_is_expired(ocapa))
+			continue;
+		if ((opc & CAPA_OPC_OSS_WRITE) &&
+		    capa_opc_supported(&ocapa->c_capa, CAPA_OPC_OSS_WRITE)) {
+			found = 1;
+			break;
+		} else if ((opc & CAPA_OPC_OSS_READ) &&
+			   capa_opc_supported(&ocapa->c_capa,
+					      CAPA_OPC_OSS_READ)) {
+			found = 1;
+			break;
+		} else if ((opc & CAPA_OPC_OSS_TRUNC) &&
+			   capa_opc_supported(&ocapa->c_capa, opc)) {
+			found = 1;
+			break;
+		}
+	}
+
+	if (found) {
+		LASSERT(lu_fid_eq(capa_fid(&ocapa->c_capa),
+				  ll_inode2fid(inode)));
+		LASSERT(ocapa->c_site == CAPA_SITE_CLIENT);
+
+		capa_get(ocapa);
+
+		DEBUG_CAPA(D_SEC, &ocapa->c_capa, "found client");
+	} else {
+		ocapa = NULL;
+
+		if (atomic_read(&ll_capa_debug)) {
+			CERROR("no capability for "DFID" opc %#llx\n",
+			       PFID(&lli->lli_fid), opc);
+			atomic_set(&ll_capa_debug, 0);
+		}
+	}
+	spin_unlock(&capa_lock);
+
+	return ocapa;
+}
+EXPORT_SYMBOL(ll_osscapa_get);
+
+struct obd_capa *ll_mdscapa_get(struct inode *inode)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+	struct obd_capa *ocapa;
+
+	LASSERT(inode != NULL);
+
+	if ((ll_i2sbi(inode)->ll_flags & LL_SBI_MDS_CAPA) == 0)
+		return NULL;
+
+	spin_lock(&capa_lock);
+	ocapa = capa_get(lli->lli_mds_capa);
+	spin_unlock(&capa_lock);
+	if (!ocapa && atomic_read(&ll_capa_debug)) {
+		CERROR("no mds capability for "DFID"\n", PFID(&lli->lli_fid));
+		atomic_set(&ll_capa_debug, 0);
+	}
+
+	return ocapa;
+}
+
+static struct obd_capa *do_add_mds_capa(struct inode *inode,
+					struct obd_capa *ocapa)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+	struct obd_capa *old = lli->lli_mds_capa;
+	struct lustre_capa *capa = &ocapa->c_capa;
+
+	if (!old) {
+		ocapa->u.cli.inode = inode;
+		lli->lli_mds_capa = ocapa;
+		capa_count[CAPA_SITE_CLIENT]++;
+
+		DEBUG_CAPA(D_SEC, capa, "add MDS");
+	} else {
+		spin_lock(&old->c_lock);
+		old->c_capa = *capa;
+		spin_unlock(&old->c_lock);
+
+		DEBUG_CAPA(D_SEC, capa, "update MDS");
+
+		capa_put(ocapa);
+		ocapa = old;
+	}
+	return ocapa;
+}
+
+static struct obd_capa *do_lookup_oss_capa(struct inode *inode, int opc)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+	struct obd_capa *ocapa;
+
+	/* inside capa_lock */
+	list_for_each_entry(ocapa, &lli->lli_oss_capas, u.cli.lli_list) {
+		if ((capa_opc(&ocapa->c_capa) & opc) != opc)
+			continue;
+
+		LASSERT(lu_fid_eq(capa_fid(&ocapa->c_capa),
+				  ll_inode2fid(inode)));
+		LASSERT(ocapa->c_site == CAPA_SITE_CLIENT);
+
+		DEBUG_CAPA(D_SEC, &ocapa->c_capa, "found client");
+		return ocapa;
+	}
+
+	return NULL;
+}
+
+static inline void inode_add_oss_capa(struct inode *inode,
+				      struct obd_capa *ocapa)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+	struct obd_capa *tmp;
+	struct list_head *next = NULL;
+
+	/* capa is sorted in lli_oss_capas so lookup can always find the
+	 * latest one */
+	list_for_each_entry(tmp, &lli->lli_oss_capas, u.cli.lli_list) {
+		if (cfs_time_after(ocapa->c_expiry, tmp->c_expiry)) {
+			next = &tmp->u.cli.lli_list;
+			break;
+		}
+	}
+	LASSERT(&ocapa->u.cli.lli_list != next);
+	list_move_tail(&ocapa->u.cli.lli_list, next ?: &lli->lli_oss_capas);
+}
+
+static struct obd_capa *do_add_oss_capa(struct inode *inode,
+					struct obd_capa *ocapa)
+{
+	struct obd_capa *old;
+	struct lustre_capa *capa = &ocapa->c_capa;
+
+	LASSERTF(S_ISREG(inode->i_mode),
+		 "inode has oss capa, but not regular file, mode: %d\n",
+		 inode->i_mode);
+
+	/* FIXME: can't replace it so easily with fine-grained opc */
+	old = do_lookup_oss_capa(inode, capa_opc(capa) & CAPA_OPC_OSS_ONLY);
+	if (!old) {
+		ocapa->u.cli.inode = inode;
+		INIT_LIST_HEAD(&ocapa->u.cli.lli_list);
+		capa_count[CAPA_SITE_CLIENT]++;
+
+		DEBUG_CAPA(D_SEC, capa, "add OSS");
+	} else {
+		spin_lock(&old->c_lock);
+		old->c_capa = *capa;
+		spin_unlock(&old->c_lock);
+
+		DEBUG_CAPA(D_SEC, capa, "update OSS");
+
+		capa_put(ocapa);
+		ocapa = old;
+	}
+
+	inode_add_oss_capa(inode, ocapa);
+	return ocapa;
+}
+
+struct obd_capa *ll_add_capa(struct inode *inode, struct obd_capa *ocapa)
+{
+	spin_lock(&capa_lock);
+	ocapa = capa_for_mds(&ocapa->c_capa) ? do_add_mds_capa(inode, ocapa) :
+					       do_add_oss_capa(inode, ocapa);
+
+	/* truncate capa won't renew */
+	if (ocapa->c_capa.lc_opc != CAPA_OPC_OSS_TRUNC) {
+		set_capa_expiry(ocapa);
+		list_del_init(&ocapa->c_list);
+		sort_add_capa(ocapa, ll_capa_list);
+
+		update_capa_timer(ocapa, capa_renewal_time(ocapa));
+	}
+
+	spin_unlock(&capa_lock);
+
+	atomic_set(&ll_capa_debug, 1);
+	return ocapa;
+}
+
+static inline void delay_capa_renew(struct obd_capa *oc, unsigned long delay)
+{
+	/* NB: set a fake expiry for this capa to prevent it renew too soon */
+	oc->c_expiry = cfs_time_add(oc->c_expiry, cfs_time_seconds(delay));
+}
+
+static int ll_update_capa(struct obd_capa *ocapa, struct lustre_capa *capa)
+{
+	struct inode *inode = ocapa->u.cli.inode;
+	int rc = 0;
+
+	LASSERT(ocapa);
+
+	if (IS_ERR(capa)) {
+		/* set error code */
+		rc = PTR_ERR(capa);
+		spin_lock(&capa_lock);
+		if (rc == -ENOENT) {
+			DEBUG_CAPA(D_SEC, &ocapa->c_capa,
+				   "renewal canceled because object removed");
+			ll_capa_renewal_noent++;
+		} else {
+			ll_capa_renewal_failed++;
+
+			/* failed capa won't be renewed any longer, but if -EIO,
+			 * client might be doing recovery, retry in 2 min. */
+			if (rc == -EIO && !capa_is_expired(ocapa)) {
+				delay_capa_renew(ocapa, 120);
+				DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
+					   "renewal failed: -EIO, retry in 2 mins");
+				ll_capa_renewal_retries++;
+				goto retry;
+			} else {
+				DEBUG_CAPA(D_ERROR, &ocapa->c_capa,
+					   "renewal failed(rc: %d) for", rc);
+			}
+		}
+
+		list_del_init(&ocapa->c_list);
+		sort_add_capa(ocapa, &ll_idle_capas);
+		spin_unlock(&capa_lock);
+
+		capa_put(ocapa);
+		iput(inode);
+		return rc;
+	}
+
+	spin_lock(&ocapa->c_lock);
+	LASSERT(!memcmp(&ocapa->c_capa, capa,
+			offsetof(struct lustre_capa, lc_opc)));
+	ocapa->c_capa = *capa;
+	set_capa_expiry(ocapa);
+	spin_unlock(&ocapa->c_lock);
+
+	spin_lock(&capa_lock);
+	if (capa_for_oss(capa))
+		inode_add_oss_capa(inode, ocapa);
+	DEBUG_CAPA(D_SEC, capa, "renew");
+retry:
+	list_del_init(&ocapa->c_list);
+	sort_add_capa(ocapa, ll_capa_list);
+	update_capa_timer(ocapa, capa_renewal_time(ocapa));
+	spin_unlock(&capa_lock);
+
+	capa_put(ocapa);
+	iput(inode);
+	return rc;
+}
+
+void ll_capa_open(struct inode *inode)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+
+	if ((ll_i2sbi(inode)->ll_flags & (LL_SBI_MDS_CAPA | LL_SBI_OSS_CAPA))
+	    == 0)
+		return;
+
+	if (!S_ISREG(inode->i_mode))
+		return;
+
+	atomic_inc(&lli->lli_open_count);
+}
+
+void ll_capa_close(struct inode *inode)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+
+	if ((ll_i2sbi(inode)->ll_flags & (LL_SBI_MDS_CAPA | LL_SBI_OSS_CAPA))
+	    == 0)
+		return;
+
+	if (!S_ISREG(inode->i_mode))
+		return;
+
+	atomic_dec(&lli->lli_open_count);
+}
+
+/* delete CAPA_OPC_OSS_TRUNC only */
+void ll_truncate_free_capa(struct obd_capa *ocapa)
+{
+	if (!ocapa)
+		return;
+
+	LASSERT(ocapa->c_capa.lc_opc & CAPA_OPC_OSS_TRUNC);
+	DEBUG_CAPA(D_SEC, &ocapa->c_capa, "free truncate");
+
+	/* release ref when find */
+	capa_put(ocapa);
+	if (likely(ocapa->c_capa.lc_opc == CAPA_OPC_OSS_TRUNC)) {
+		spin_lock(&capa_lock);
+		ll_delete_capa(ocapa);
+		spin_unlock(&capa_lock);
+	}
+}
+
+void ll_clear_inode_capas(struct inode *inode)
+{
+	struct ll_inode_info *lli = ll_i2info(inode);
+	struct obd_capa *ocapa, *tmp;
+
+	spin_lock(&capa_lock);
+	ocapa = lli->lli_mds_capa;
+	if (ocapa)
+		ll_delete_capa(ocapa);
+
+	list_for_each_entry_safe(ocapa, tmp, &lli->lli_oss_capas,
+				     u.cli.lli_list)
+		ll_delete_capa(ocapa);
+	spin_unlock(&capa_lock);
+}
+
+void ll_print_capa_stat(struct ll_sb_info *sbi)
+{
+	if (sbi->ll_flags & (LL_SBI_MDS_CAPA | LL_SBI_OSS_CAPA))
+		LCONSOLE_INFO("Fid capabilities renewed: %llu\n"
+			      "Fid capabilities renewal ENOENT: %llu\n"
+			      "Fid capabilities failed to renew: %llu\n"
+			      "Fid capabilities renewal retries: %llu\n",
+			      ll_capa_renewed, ll_capa_renewal_noent,
+			      ll_capa_renewal_failed, ll_capa_renewal_retries);
+}