init android origin source code

1 files changed, 6625 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/nfs/nfs4proc.c b/ANDROID_3.4.5/fs/nfs/nfs4proc.c
new file mode 100644
index 00000000..d60c2d87
--- /dev/null
+++ b/ANDROID_3.4.5/fs/nfs/nfs4proc.c
@@ -0,0 +1,6625 @@
+/*
+ *  fs/nfs/nfs4proc.c
+ *
+ *  Client-side procedure declarations for NFSv4.
+ *
+ *  Copyright (c) 2002 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Kendrick Smith <kmsmith@umich.edu>
+ *  Andy Adamson   <andros@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/ratelimit.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/nfs.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/nfs_mount.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/module.h>
+#include <linux/nfs_idmap.h>
+#include <linux/sunrpc/bc_xprt.h>
+#include <linux/xattr.h>
+#include <linux/utsname.h>
+#include <linux/freezer.h>
+
+#include "nfs4_fs.h"
+#include "delegation.h"
+#include "internal.h"
+#include "iostat.h"
+#include "callback.h"
+#include "pnfs.h"
+
+#define NFSDBG_FACILITY		NFSDBG_PROC
+
+#define NFS4_POLL_RETRY_MIN	(HZ/10)
+#define NFS4_POLL_RETRY_MAX	(15*HZ)
+
+#define NFS4_MAX_LOOP_ON_RECOVER (10)
+
+static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
+
+struct nfs4_opendata;
+static int _nfs4_proc_open(struct nfs4_opendata *data);
+static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
+static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
+static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
+static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
+static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
+			    struct nfs_fattr *fattr, struct iattr *sattr,
+			    struct nfs4_state *state);
+#ifdef CONFIG_NFS_V4_1
+static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
+static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
+#endif
+/* Prevent leaks of NFSv4 errors into userland */
+static int nfs4_map_errors(int err)
+{
+	if (err >= -1000)
+		return err;
+	switch (err) {
+	case -NFS4ERR_RESOURCE:
+		return -EREMOTEIO;
+	case -NFS4ERR_WRONGSEC:
+		return -EPERM;
+	case -NFS4ERR_BADOWNER:
+	case -NFS4ERR_BADNAME:
+		return -EINVAL;
+	case -NFS4ERR_SHARE_DENIED:
+		return -EACCES;
+	default:
+		dprintk("%s could not handle NFSv4 error %d\n",
+				__func__, -err);
+		break;
+	}
+	return -EIO;
+}
+
+/*
+ * This is our standard bitmap for GETATTR requests.
+ */
+const u32 nfs4_fattr_bitmap[2] = {
+	FATTR4_WORD0_TYPE
+	| FATTR4_WORD0_CHANGE
+	| FATTR4_WORD0_SIZE
+	| FATTR4_WORD0_FSID
+	| FATTR4_WORD0_FILEID,
+	FATTR4_WORD1_MODE
+	| FATTR4_WORD1_NUMLINKS
+	| FATTR4_WORD1_OWNER
+	| FATTR4_WORD1_OWNER_GROUP
+	| FATTR4_WORD1_RAWDEV
+	| FATTR4_WORD1_SPACE_USED
+	| FATTR4_WORD1_TIME_ACCESS
+	| FATTR4_WORD1_TIME_METADATA
+	| FATTR4_WORD1_TIME_MODIFY
+};
+
+const u32 nfs4_statfs_bitmap[2] = {
+	FATTR4_WORD0_FILES_AVAIL
+	| FATTR4_WORD0_FILES_FREE
+	| FATTR4_WORD0_FILES_TOTAL,
+	FATTR4_WORD1_SPACE_AVAIL
+	| FATTR4_WORD1_SPACE_FREE
+	| FATTR4_WORD1_SPACE_TOTAL
+};
+
+const u32 nfs4_pathconf_bitmap[2] = {
+	FATTR4_WORD0_MAXLINK
+	| FATTR4_WORD0_MAXNAME,
+	0
+};
+
+const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
+			| FATTR4_WORD0_MAXREAD
+			| FATTR4_WORD0_MAXWRITE
+			| FATTR4_WORD0_LEASE_TIME,
+			FATTR4_WORD1_TIME_DELTA
+			| FATTR4_WORD1_FS_LAYOUT_TYPES,
+			FATTR4_WORD2_LAYOUT_BLKSIZE
+};
+
+const u32 nfs4_fs_locations_bitmap[2] = {
+	FATTR4_WORD0_TYPE
+	| FATTR4_WORD0_CHANGE
+	| FATTR4_WORD0_SIZE
+	| FATTR4_WORD0_FSID
+	| FATTR4_WORD0_FILEID
+	| FATTR4_WORD0_FS_LOCATIONS,
+	FATTR4_WORD1_MODE
+	| FATTR4_WORD1_NUMLINKS
+	| FATTR4_WORD1_OWNER
+	| FATTR4_WORD1_OWNER_GROUP
+	| FATTR4_WORD1_RAWDEV
+	| FATTR4_WORD1_SPACE_USED
+	| FATTR4_WORD1_TIME_ACCESS
+	| FATTR4_WORD1_TIME_METADATA
+	| FATTR4_WORD1_TIME_MODIFY
+	| FATTR4_WORD1_MOUNTED_ON_FILEID
+};
+
+static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
+		struct nfs4_readdir_arg *readdir)
+{
+	__be32 *start, *p;
+
+	BUG_ON(readdir->count < 80);
+	if (cookie > 2) {
+		readdir->cookie = cookie;
+		memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
+		return;
+	}
+
+	readdir->cookie = 0;
+	memset(&readdir->verifier, 0, sizeof(readdir->verifier));
+	if (cookie == 2)
+		return;
+	
+	/*
+	 * NFSv4 servers do not return entries for '.' and '..'
+	 * Therefore, we fake these entries here.  We let '.'
+	 * have cookie 0 and '..' have cookie 1.  Note that
+	 * when talking to the server, we always send cookie 0
+	 * instead of 1 or 2.
+	 */
+	start = p = kmap_atomic(*readdir->pages);
+	
+	if (cookie == 0) {
+		*p++ = xdr_one;                                  /* next */
+		*p++ = xdr_zero;                   /* cookie, first word */
+		*p++ = xdr_one;                   /* cookie, second word */
+		*p++ = xdr_one;                             /* entry len */
+		memcpy(p, ".\0\0\0", 4);                        /* entry */
+		p++;
+		*p++ = xdr_one;                         /* bitmap length */
+		*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
+		*p++ = htonl(8);              /* attribute buffer length */
+		p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
+	}
+	
+	*p++ = xdr_one;                                  /* next */
+	*p++ = xdr_zero;                   /* cookie, first word */
+	*p++ = xdr_two;                   /* cookie, second word */
+	*p++ = xdr_two;                             /* entry len */
+	memcpy(p, "..\0\0", 4);                         /* entry */
+	p++;
+	*p++ = xdr_one;                         /* bitmap length */
+	*p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
+	*p++ = htonl(8);              /* attribute buffer length */
+	p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
+
+	readdir->pgbase = (char *)p - (char *)start;
+	readdir->count -= readdir->pgbase;
+	kunmap_atomic(start);
+}
+
+static int nfs4_wait_clnt_recover(struct nfs_client *clp)
+{
+	int res;
+
+	might_sleep();
+
+	res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
+			nfs_wait_bit_killable, TASK_KILLABLE);
+	return res;
+}
+
+static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
+{
+	int res = 0;
+
+	might_sleep();
+
+	if (*timeout <= 0)
+		*timeout = NFS4_POLL_RETRY_MIN;
+	if (*timeout > NFS4_POLL_RETRY_MAX)
+		*timeout = NFS4_POLL_RETRY_MAX;
+	freezable_schedule_timeout_killable(*timeout);
+	if (fatal_signal_pending(current))
+		res = -ERESTARTSYS;
+	*timeout <<= 1;
+	return res;
+}
+
+/* This is the error handling routine for processes that are allowed
+ * to sleep.
+ */
+static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
+{
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs4_state *state = exception->state;
+	struct inode *inode = exception->inode;
+	int ret = errorcode;
+
+	exception->retry = 0;
+	switch(errorcode) {
+		case 0:
+			return 0;
+		case -NFS4ERR_OPENMODE:
+			if (inode && nfs_have_delegation(inode, FMODE_READ)) {
+				nfs_inode_return_delegation(inode);
+				exception->retry = 1;
+				return 0;
+			}
+			if (state == NULL)
+				break;
+			nfs4_schedule_stateid_recovery(server, state);
+			goto wait_on_recovery;
+		case -NFS4ERR_DELEG_REVOKED:
+		case -NFS4ERR_ADMIN_REVOKED:
+		case -NFS4ERR_BAD_STATEID:
+			if (state == NULL)
+				break;
+			nfs_remove_bad_delegation(state->inode);
+			nfs4_schedule_stateid_recovery(server, state);
+			goto wait_on_recovery;
+		case -NFS4ERR_EXPIRED:
+			if (state != NULL)
+				nfs4_schedule_stateid_recovery(server, state);
+		case -NFS4ERR_STALE_STATEID:
+		case -NFS4ERR_STALE_CLIENTID:
+			nfs4_schedule_lease_recovery(clp);
+			goto wait_on_recovery;
+#if defined(CONFIG_NFS_V4_1)
+		case -NFS4ERR_BADSESSION:
+		case -NFS4ERR_BADSLOT:
+		case -NFS4ERR_BAD_HIGH_SLOT:
+		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+		case -NFS4ERR_DEADSESSION:
+		case -NFS4ERR_SEQ_FALSE_RETRY:
+		case -NFS4ERR_SEQ_MISORDERED:
+			dprintk("%s ERROR: %d Reset session\n", __func__,
+				errorcode);
+			nfs4_schedule_session_recovery(clp->cl_session);
+			exception->retry = 1;
+			break;
+#endif /* defined(CONFIG_NFS_V4_1) */
+		case -NFS4ERR_FILE_OPEN:
+			if (exception->timeout > HZ) {
+				/* We have retried a decent amount, time to
+				 * fail
+				 */
+				ret = -EBUSY;
+				break;
+			}
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_DELAY:
+		case -EKEYEXPIRED:
+			ret = nfs4_delay(server->client, &exception->timeout);
+			if (ret != 0)
+				break;
+		case -NFS4ERR_RETRY_UNCACHED_REP:
+		case -NFS4ERR_OLD_STATEID:
+			exception->retry = 1;
+			break;
+		case -NFS4ERR_BADOWNER:
+			/* The following works around a Linux server bug! */
+		case -NFS4ERR_BADNAME:
+			if (server->caps & NFS_CAP_UIDGID_NOMAP) {
+				server->caps &= ~NFS_CAP_UIDGID_NOMAP;
+				exception->retry = 1;
+				printk(KERN_WARNING "NFS: v4 server %s "
+						"does not accept raw "
+						"uid/gids. "
+						"Reenabling the idmapper.\n",
+						server->nfs_client->cl_hostname);
+			}
+	}
+	/* We failed to handle the error */
+	return nfs4_map_errors(ret);
+wait_on_recovery:
+	ret = nfs4_wait_clnt_recover(clp);
+	if (ret == 0)
+		exception->retry = 1;
+	return ret;
+}
+
+
+static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
+{
+	spin_lock(&clp->cl_lock);
+	if (time_before(clp->cl_last_renewal,timestamp))
+		clp->cl_last_renewal = timestamp;
+	spin_unlock(&clp->cl_lock);
+}
+
+static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
+{
+	do_renew_lease(server->nfs_client, timestamp);
+}
+
+#if defined(CONFIG_NFS_V4_1)
+
+/*
+ * nfs4_free_slot - free a slot and efficiently update slot table.
+ *
+ * freeing a slot is trivially done by clearing its respective bit
+ * in the bitmap.
+ * If the freed slotid equals highest_used_slotid we want to update it
+ * so that the server would be able to size down the slot table if needed,
+ * otherwise we know that the highest_used_slotid is still in use.
+ * When updating highest_used_slotid there may be "holes" in the bitmap
+ * so we need to scan down from highest_used_slotid to 0 looking for the now
+ * highest slotid in use.
+ * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
+ *
+ * Must be called while holding tbl->slot_tbl_lock
+ */
+static void
+nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
+{
+	BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
+	/* clear used bit in bitmap */
+	__clear_bit(slotid, tbl->used_slots);
+
+	/* update highest_used_slotid when it is freed */
+	if (slotid == tbl->highest_used_slotid) {
+		slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
+		if (slotid < tbl->max_slots)
+			tbl->highest_used_slotid = slotid;
+		else
+			tbl->highest_used_slotid = NFS4_NO_SLOT;
+	}
+	dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
+		slotid, tbl->highest_used_slotid);
+}
+
+bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
+{
+	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+	return true;
+}
+
+/*
+ * Signal state manager thread if session fore channel is drained
+ */
+static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
+{
+	if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
+		rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
+				nfs4_set_task_privileged, NULL);
+		return;
+	}
+
+	if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
+		return;
+
+	dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
+	complete(&ses->fc_slot_table.complete);
+}
+
+/*
+ * Signal state manager thread if session back channel is drained
+ */
+void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
+{
+	if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
+	    ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
+		return;
+	dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
+	complete(&ses->bc_slot_table.complete);
+}
+
+static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
+{
+	struct nfs4_slot_table *tbl;
+
+	tbl = &res->sr_session->fc_slot_table;
+	if (!res->sr_slot) {
+		/* just wake up the next guy waiting since
+		 * we may have not consumed a slot after all */
+		dprintk("%s: No slot\n", __func__);
+		return;
+	}
+
+	spin_lock(&tbl->slot_tbl_lock);
+	nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
+	nfs4_check_drain_fc_complete(res->sr_session);
+	spin_unlock(&tbl->slot_tbl_lock);
+	res->sr_slot = NULL;
+}
+
+static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
+{
+	unsigned long timestamp;
+	struct nfs_client *clp;
+
+	/*
+	 * sr_status remains 1 if an RPC level error occurred. The server
+	 * may or may not have processed the sequence operation..
+	 * Proceed as if the server received and processed the sequence
+	 * operation.
+	 */
+	if (res->sr_status == 1)
+		res->sr_status = NFS_OK;
+
+	/* don't increment the sequence number if the task wasn't sent */
+	if (!RPC_WAS_SENT(task))
+		goto out;
+
+	/* Check the SEQUENCE operation status */
+	switch (res->sr_status) {
+	case 0:
+		/* Update the slot's sequence and clientid lease timer */
+		++res->sr_slot->seq_nr;
+		timestamp = res->sr_renewal_time;
+		clp = res->sr_session->clp;
+		do_renew_lease(clp, timestamp);
+		/* Check sequence flags */
+		if (res->sr_status_flags != 0)
+			nfs4_schedule_lease_recovery(clp);
+		break;
+	case -NFS4ERR_DELAY:
+		/* The server detected a resend of the RPC call and
+		 * returned NFS4ERR_DELAY as per Section 2.10.6.2
+		 * of RFC5661.
+		 */
+		dprintk("%s: slot=%td seq=%d: Operation in progress\n",
+			__func__,
+			res->sr_slot - res->sr_session->fc_slot_table.slots,
+			res->sr_slot->seq_nr);
+		goto out_retry;
+	default:
+		/* Just update the slot sequence no. */
+		++res->sr_slot->seq_nr;
+	}
+out:
+	/* The session may be reset by one of the error handlers. */
+	dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
+	nfs41_sequence_free_slot(res);
+	return 1;
+out_retry:
+	if (!rpc_restart_call(task))
+		goto out;
+	rpc_delay(task, NFS4_POLL_RETRY_MAX);
+	return 0;
+}
+
+static int nfs4_sequence_done(struct rpc_task *task,
+			       struct nfs4_sequence_res *res)
+{
+	if (res->sr_session == NULL)
+		return 1;
+	return nfs41_sequence_done(task, res);
+}
+
+/*
+ * nfs4_find_slot - efficiently look for a free slot
+ *
+ * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
+ * If found, we mark the slot as used, update the highest_used_slotid,
+ * and respectively set up the sequence operation args.
+ * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
+ *
+ * Note: must be called with under the slot_tbl_lock.
+ */
+static u32
+nfs4_find_slot(struct nfs4_slot_table *tbl)
+{
+	u32 slotid;
+	u32 ret_id = NFS4_NO_SLOT;
+
+	dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
+		__func__, tbl->used_slots[0], tbl->highest_used_slotid,
+		tbl->max_slots);
+	slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
+	if (slotid >= tbl->max_slots)
+		goto out;
+	__set_bit(slotid, tbl->used_slots);
+	if (slotid > tbl->highest_used_slotid ||
+			tbl->highest_used_slotid == NFS4_NO_SLOT)
+		tbl->highest_used_slotid = slotid;
+	ret_id = slotid;
+out:
+	dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
+		__func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
+	return ret_id;
+}
+
+static void nfs41_init_sequence(struct nfs4_sequence_args *args,
+		struct nfs4_sequence_res *res, int cache_reply)
+{
+	args->sa_session = NULL;
+	args->sa_cache_this = 0;
+	if (cache_reply)
+		args->sa_cache_this = 1;
+	res->sr_session = NULL;
+	res->sr_slot = NULL;
+}
+
+int nfs41_setup_sequence(struct nfs4_session *session,
+				struct nfs4_sequence_args *args,
+				struct nfs4_sequence_res *res,
+				struct rpc_task *task)
+{
+	struct nfs4_slot *slot;
+	struct nfs4_slot_table *tbl;
+	u32 slotid;
+
+	dprintk("--> %s\n", __func__);
+	/* slot already allocated? */
+	if (res->sr_slot != NULL)
+		return 0;
+
+	tbl = &session->fc_slot_table;
+
+	spin_lock(&tbl->slot_tbl_lock);
+	if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
+	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
+		/* The state manager will wait until the slot table is empty */
+		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+		spin_unlock(&tbl->slot_tbl_lock);
+		dprintk("%s session is draining\n", __func__);
+		return -EAGAIN;
+	}
+
+	if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
+	    !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
+		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+		spin_unlock(&tbl->slot_tbl_lock);
+		dprintk("%s enforce FIFO order\n", __func__);
+		return -EAGAIN;
+	}
+
+	slotid = nfs4_find_slot(tbl);
+	if (slotid == NFS4_NO_SLOT) {
+		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+		spin_unlock(&tbl->slot_tbl_lock);
+		dprintk("<-- %s: no free slots\n", __func__);
+		return -EAGAIN;
+	}
+	spin_unlock(&tbl->slot_tbl_lock);
+
+	rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
+	slot = tbl->slots + slotid;
+	args->sa_session = session;
+	args->sa_slotid = slotid;
+
+	dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
+
+	res->sr_session = session;
+	res->sr_slot = slot;
+	res->sr_renewal_time = jiffies;
+	res->sr_status_flags = 0;
+	/*
+	 * sr_status is only set in decode_sequence, and so will remain
+	 * set to 1 if an rpc level failure occurs.
+	 */
+	res->sr_status = 1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
+
+int nfs4_setup_sequence(const struct nfs_server *server,
+			struct nfs4_sequence_args *args,
+			struct nfs4_sequence_res *res,
+			struct rpc_task *task)
+{
+	struct nfs4_session *session = nfs4_get_session(server);
+	int ret = 0;
+
+	if (session == NULL)
+		goto out;
+
+	dprintk("--> %s clp %p session %p sr_slot %td\n",
+		__func__, session->clp, session, res->sr_slot ?
+			res->sr_slot - session->fc_slot_table.slots : -1);
+
+	ret = nfs41_setup_sequence(session, args, res, task);
+out:
+	dprintk("<-- %s status=%d\n", __func__, ret);
+	return ret;
+}
+
+struct nfs41_call_sync_data {
+	const struct nfs_server *seq_server;
+	struct nfs4_sequence_args *seq_args;
+	struct nfs4_sequence_res *seq_res;
+};
+
+static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs41_call_sync_data *data = calldata;
+
+	dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
+
+	if (nfs4_setup_sequence(data->seq_server, data->seq_args,
+				data->seq_res, task))
+		return;
+	rpc_call_start(task);
+}
+
+static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
+{
+	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+	nfs41_call_sync_prepare(task, calldata);
+}
+
+static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs41_call_sync_data *data = calldata;
+
+	nfs41_sequence_done(task, data->seq_res);
+}
+
+static const struct rpc_call_ops nfs41_call_sync_ops = {
+	.rpc_call_prepare = nfs41_call_sync_prepare,
+	.rpc_call_done = nfs41_call_sync_done,
+};
+
+static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
+	.rpc_call_prepare = nfs41_call_priv_sync_prepare,
+	.rpc_call_done = nfs41_call_sync_done,
+};
+
+static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
+				   struct nfs_server *server,
+				   struct rpc_message *msg,
+				   struct nfs4_sequence_args *args,
+				   struct nfs4_sequence_res *res,
+				   int privileged)
+{
+	int ret;
+	struct rpc_task *task;
+	struct nfs41_call_sync_data data = {
+		.seq_server = server,
+		.seq_args = args,
+		.seq_res = res,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = clnt,
+		.rpc_message = msg,
+		.callback_ops = &nfs41_call_sync_ops,
+		.callback_data = &data
+	};
+
+	if (privileged)
+		task_setup.callback_ops = &nfs41_call_priv_sync_ops;
+	task = rpc_run_task(&task_setup);
+	if (IS_ERR(task))
+		ret = PTR_ERR(task);
+	else {
+		ret = task->tk_status;
+		rpc_put_task(task);
+	}
+	return ret;
+}
+
+int _nfs4_call_sync_session(struct rpc_clnt *clnt,
+			    struct nfs_server *server,
+			    struct rpc_message *msg,
+			    struct nfs4_sequence_args *args,
+			    struct nfs4_sequence_res *res,
+			    int cache_reply)
+{
+	nfs41_init_sequence(args, res, cache_reply);
+	return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
+}
+
+#else
+static inline
+void nfs41_init_sequence(struct nfs4_sequence_args *args,
+		struct nfs4_sequence_res *res, int cache_reply)
+{
+}
+
+static int nfs4_sequence_done(struct rpc_task *task,
+			       struct nfs4_sequence_res *res)
+{
+	return 1;
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+int _nfs4_call_sync(struct rpc_clnt *clnt,
+		    struct nfs_server *server,
+		    struct rpc_message *msg,
+		    struct nfs4_sequence_args *args,
+		    struct nfs4_sequence_res *res,
+		    int cache_reply)
+{
+	nfs41_init_sequence(args, res, cache_reply);
+	return rpc_call_sync(clnt, msg, 0);
+}
+
+static inline
+int nfs4_call_sync(struct rpc_clnt *clnt,
+		   struct nfs_server *server,
+		   struct rpc_message *msg,
+		   struct nfs4_sequence_args *args,
+		   struct nfs4_sequence_res *res,
+		   int cache_reply)
+{
+	return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
+						args, res, cache_reply);
+}
+
+static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
+{
+	struct nfs_inode *nfsi = NFS_I(dir);
+
+	spin_lock(&dir->i_lock);
+	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
+	if (!cinfo->atomic || cinfo->before != dir->i_version)
+		nfs_force_lookup_revalidate(dir);
+	dir->i_version = cinfo->after;
+	spin_unlock(&dir->i_lock);
+}
+
+struct nfs4_opendata {
+	struct kref kref;
+	struct nfs_openargs o_arg;
+	struct nfs_openres o_res;
+	struct nfs_open_confirmargs c_arg;
+	struct nfs_open_confirmres c_res;
+	struct nfs4_string owner_name;
+	struct nfs4_string group_name;
+	struct nfs_fattr f_attr;
+	struct nfs_fattr dir_attr;
+	struct dentry *dir;
+	struct dentry *dentry;
+	struct nfs4_state_owner *owner;
+	struct nfs4_state *state;
+	struct iattr attrs;
+	unsigned long timestamp;
+	unsigned int rpc_done : 1;
+	int rpc_status;
+	int cancelled;
+};
+
+
+static void nfs4_init_opendata_res(struct nfs4_opendata *p)
+{
+	p->o_res.f_attr = &p->f_attr;
+	p->o_res.dir_attr = &p->dir_attr;
+	p->o_res.seqid = p->o_arg.seqid;
+	p->c_res.seqid = p->c_arg.seqid;
+	p->o_res.server = p->o_arg.server;
+	nfs_fattr_init(&p->f_attr);
+	nfs_fattr_init(&p->dir_attr);
+	nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
+}
+
+static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
+		struct nfs4_state_owner *sp, fmode_t fmode, int flags,
+		const struct iattr *attrs,
+		gfp_t gfp_mask)
+{
+	struct dentry *parent = dget_parent(dentry);
+	struct inode *dir = parent->d_inode;
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs4_opendata *p;
+
+	p = kzalloc(sizeof(*p), gfp_mask);
+	if (p == NULL)
+		goto err;
+	p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
+	if (p->o_arg.seqid == NULL)
+		goto err_free;
+	nfs_sb_active(dentry->d_sb);
+	p->dentry = dget(dentry);
+	p->dir = parent;
+	p->owner = sp;
+	atomic_inc(&sp->so_count);
+	p->o_arg.fh = NFS_FH(dir);
+	p->o_arg.open_flags = flags;
+	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
+	p->o_arg.clientid = server->nfs_client->cl_clientid;
+	p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
+	p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
+	p->o_arg.name = &dentry->d_name;
+	p->o_arg.server = server;
+	p->o_arg.bitmask = server->attr_bitmask;
+	p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
+	p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
+	if (attrs != NULL && attrs->ia_valid != 0) {
+		__be32 verf[2];
+
+		p->o_arg.u.attrs = &p->attrs;
+		memcpy(&p->attrs, attrs, sizeof(p->attrs));
+
+		verf[0] = jiffies;
+		verf[1] = current->pid;
+		memcpy(p->o_arg.u.verifier.data, verf,
+				sizeof(p->o_arg.u.verifier.data));
+	}
+	p->c_arg.fh = &p->o_res.fh;
+	p->c_arg.stateid = &p->o_res.stateid;
+	p->c_arg.seqid = p->o_arg.seqid;
+	nfs4_init_opendata_res(p);
+	kref_init(&p->kref);
+	return p;
+err_free:
+	kfree(p);
+err:
+	dput(parent);
+	return NULL;
+}
+
+static void nfs4_opendata_free(struct kref *kref)
+{
+	struct nfs4_opendata *p = container_of(kref,
+			struct nfs4_opendata, kref);
+	struct super_block *sb = p->dentry->d_sb;
+
+	nfs_free_seqid(p->o_arg.seqid);
+	if (p->state != NULL)
+		nfs4_put_open_state(p->state);
+	nfs4_put_state_owner(p->owner);
+	dput(p->dir);
+	dput(p->dentry);
+	nfs_sb_deactive(sb);
+	nfs_fattr_free_names(&p->f_attr);
+	kfree(p);
+}
+
+static void nfs4_opendata_put(struct nfs4_opendata *p)
+{
+	if (p != NULL)
+		kref_put(&p->kref, nfs4_opendata_free);
+}
+
+static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
+{
+	int ret;
+
+	ret = rpc_wait_for_completion_task(task);
+	return ret;
+}
+
+static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
+{
+	int ret = 0;
+
+	if (open_mode & (O_EXCL|O_TRUNC))
+		goto out;
+	switch (mode & (FMODE_READ|FMODE_WRITE)) {
+		case FMODE_READ:
+			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
+				&& state->n_rdonly != 0;
+			break;
+		case FMODE_WRITE:
+			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
+				&& state->n_wronly != 0;
+			break;
+		case FMODE_READ|FMODE_WRITE:
+			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
+				&& state->n_rdwr != 0;
+	}
+out:
+	return ret;
+}
+
+static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
+{
+	if (delegation == NULL)
+		return 0;
+	if ((delegation->type & fmode) != fmode)
+		return 0;
+	if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
+		return 0;
+	nfs_mark_delegation_referenced(delegation);
+	return 1;
+}
+
+static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
+{
+	switch (fmode) {
+		case FMODE_WRITE:
+			state->n_wronly++;
+			break;
+		case FMODE_READ:
+			state->n_rdonly++;
+			break;
+		case FMODE_READ|FMODE_WRITE:
+			state->n_rdwr++;
+	}
+	nfs4_state_set_mode_locked(state, state->state | fmode);
+}
+
+static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
+{
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
+		nfs4_stateid_copy(&state->stateid, stateid);
+	nfs4_stateid_copy(&state->open_stateid, stateid);
+	switch (fmode) {
+		case FMODE_READ:
+			set_bit(NFS_O_RDONLY_STATE, &state->flags);
+			break;
+		case FMODE_WRITE:
+			set_bit(NFS_O_WRONLY_STATE, &state->flags);
+			break;
+		case FMODE_READ|FMODE_WRITE:
+			set_bit(NFS_O_RDWR_STATE, &state->flags);
+	}
+}
+
+static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
+{
+	write_seqlock(&state->seqlock);
+	nfs_set_open_stateid_locked(state, stateid, fmode);
+	write_sequnlock(&state->seqlock);
+}
+
+static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
+{
+	/*
+	 * Protect the call to nfs4_state_set_mode_locked and
+	 * serialise the stateid update
+	 */
+	write_seqlock(&state->seqlock);
+	if (deleg_stateid != NULL) {
+		nfs4_stateid_copy(&state->stateid, deleg_stateid);
+		set_bit(NFS_DELEGATED_STATE, &state->flags);
+	}
+	if (open_stateid != NULL)
+		nfs_set_open_stateid_locked(state, open_stateid, fmode);
+	write_sequnlock(&state->seqlock);
+	spin_lock(&state->owner->so_lock);
+	update_open_stateflags(state, fmode);
+	spin_unlock(&state->owner->so_lock);
+}
+
+static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
+{
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs_delegation *deleg_cur;
+	int ret = 0;
+
+	fmode &= (FMODE_READ|FMODE_WRITE);
+
+	rcu_read_lock();
+	deleg_cur = rcu_dereference(nfsi->delegation);
+	if (deleg_cur == NULL)
+		goto no_delegation;
+
+	spin_lock(&deleg_cur->lock);
+	if (nfsi->delegation != deleg_cur ||
+	    (deleg_cur->type & fmode) != fmode)
+		goto no_delegation_unlock;
+
+	if (delegation == NULL)
+		delegation = &deleg_cur->stateid;
+	else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
+		goto no_delegation_unlock;
+
+	nfs_mark_delegation_referenced(deleg_cur);
+	__update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
+	ret = 1;
+no_delegation_unlock:
+	spin_unlock(&deleg_cur->lock);
+no_delegation:
+	rcu_read_unlock();
+
+	if (!ret && open_stateid != NULL) {
+		__update_open_stateid(state, open_stateid, NULL, fmode);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+
+static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
+{
+	struct nfs_delegation *delegation;
+
+	rcu_read_lock();
+	delegation = rcu_dereference(NFS_I(inode)->delegation);
+	if (delegation == NULL || (delegation->type & fmode) == fmode) {
+		rcu_read_unlock();
+		return;
+	}
+	rcu_read_unlock();
+	nfs_inode_return_delegation(inode);
+}
+
+static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
+{
+	struct nfs4_state *state = opendata->state;
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs_delegation *delegation;
+	int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
+	fmode_t fmode = opendata->o_arg.fmode;
+	nfs4_stateid stateid;
+	int ret = -EAGAIN;
+
+	for (;;) {
+		if (can_open_cached(state, fmode, open_mode)) {
+			spin_lock(&state->owner->so_lock);
+			if (can_open_cached(state, fmode, open_mode)) {
+				update_open_stateflags(state, fmode);
+				spin_unlock(&state->owner->so_lock);
+				goto out_return_state;
+			}
+			spin_unlock(&state->owner->so_lock);
+		}
+		rcu_read_lock();
+		delegation = rcu_dereference(nfsi->delegation);
+		if (!can_open_delegated(delegation, fmode)) {
+			rcu_read_unlock();
+			break;
+		}
+		/* Save the delegation */
+		nfs4_stateid_copy(&stateid, &delegation->stateid);
+		rcu_read_unlock();
+		ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
+		if (ret != 0)
+			goto out;
+		ret = -EAGAIN;
+
+		/* Try to update the stateid using the delegation */
+		if (update_open_stateid(state, NULL, &stateid, fmode))
+			goto out_return_state;
+	}
+out:
+	return ERR_PTR(ret);
+out_return_state:
+	atomic_inc(&state->count);
+	return state;
+}
+
+static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
+{
+	struct inode *inode;
+	struct nfs4_state *state = NULL;
+	struct nfs_delegation *delegation;
+	int ret;
+
+	if (!data->rpc_done) {
+		state = nfs4_try_open_cached(data);
+		goto out;
+	}
+
+	ret = -EAGAIN;
+	if (!(data->f_attr.valid & NFS_ATTR_FATTR))
+		goto err;
+	inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
+	ret = PTR_ERR(inode);
+	if (IS_ERR(inode))
+		goto err;
+	ret = -ENOMEM;
+	state = nfs4_get_open_state(inode, data->owner);
+	if (state == NULL)
+		goto err_put_inode;
+	if (data->o_res.delegation_type != 0) {
+		struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+		int delegation_flags = 0;
+
+		rcu_read_lock();
+		delegation = rcu_dereference(NFS_I(inode)->delegation);
+		if (delegation)
+			delegation_flags = delegation->flags;
+		rcu_read_unlock();
+		if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
+			pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
+					"returning a delegation for "
+					"OPEN(CLAIM_DELEGATE_CUR)\n",
+					clp->cl_hostname);
+		} else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
+			nfs_inode_set_delegation(state->inode,
+					data->owner->so_cred,
+					&data->o_res);
+		else
+			nfs_inode_reclaim_delegation(state->inode,
+					data->owner->so_cred,
+					&data->o_res);
+	}
+
+	update_open_stateid(state, &data->o_res.stateid, NULL,
+			data->o_arg.fmode);
+	iput(inode);
+out:
+	return state;
+err_put_inode:
+	iput(inode);
+err:
+	return ERR_PTR(ret);
+}
+
+static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
+{
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs_open_context *ctx;
+
+	spin_lock(&state->inode->i_lock);
+	list_for_each_entry(ctx, &nfsi->open_files, list) {
+		if (ctx->state != state)
+			continue;
+		get_nfs_open_context(ctx);
+		spin_unlock(&state->inode->i_lock);
+		return ctx;
+	}
+	spin_unlock(&state->inode->i_lock);
+	return ERR_PTR(-ENOENT);
+}
+
+static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs4_opendata *opendata;
+
+	opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
+	if (opendata == NULL)
+		return ERR_PTR(-ENOMEM);
+	opendata->state = state;
+	atomic_inc(&state->count);
+	return opendata;
+}
+
+static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
+{
+	struct nfs4_state *newstate;
+	int ret;
+
+	opendata->o_arg.open_flags = 0;
+	opendata->o_arg.fmode = fmode;
+	memset(&opendata->o_res, 0, sizeof(opendata->o_res));
+	memset(&opendata->c_res, 0, sizeof(opendata->c_res));
+	nfs4_init_opendata_res(opendata);
+	ret = _nfs4_recover_proc_open(opendata);
+	if (ret != 0)
+		return ret; 
+	newstate = nfs4_opendata_to_nfs4_state(opendata);
+	if (IS_ERR(newstate))
+		return PTR_ERR(newstate);
+	nfs4_close_state(newstate, fmode);
+	*res = newstate;
+	return 0;
+}
+
+static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
+{
+	struct nfs4_state *newstate;
+	int ret;
+
+	/* memory barrier prior to reading state->n_* */
+	clear_bit(NFS_DELEGATED_STATE, &state->flags);
+	smp_rmb();
+	if (state->n_rdwr != 0) {
+		clear_bit(NFS_O_RDWR_STATE, &state->flags);
+		ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
+		if (ret != 0)
+			return ret;
+		if (newstate != state)
+			return -ESTALE;
+	}
+	if (state->n_wronly != 0) {
+		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+		ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
+		if (ret != 0)
+			return ret;
+		if (newstate != state)
+			return -ESTALE;
+	}
+	if (state->n_rdonly != 0) {
+		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+		ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
+		if (ret != 0)
+			return ret;
+		if (newstate != state)
+			return -ESTALE;
+	}
+	/*
+	 * We may have performed cached opens for all three recoveries.
+	 * Check if we need to update the current stateid.
+	 */
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
+	    !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
+		write_seqlock(&state->seqlock);
+		if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
+			nfs4_stateid_copy(&state->stateid, &state->open_stateid);
+		write_sequnlock(&state->seqlock);
+	}
+	return 0;
+}
+
+/*
+ * OPEN_RECLAIM:
+ * 	reclaim state on the server after a reboot.
+ */
+static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs_delegation *delegation;
+	struct nfs4_opendata *opendata;
+	fmode_t delegation_type = 0;
+	int status;
+
+	opendata = nfs4_open_recoverdata_alloc(ctx, state);
+	if (IS_ERR(opendata))
+		return PTR_ERR(opendata);
+	opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
+	opendata->o_arg.fh = NFS_FH(state->inode);
+	rcu_read_lock();
+	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
+	if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
+		delegation_type = delegation->type;
+	rcu_read_unlock();
+	opendata->o_arg.u.delegation_type = delegation_type;
+	status = nfs4_open_recover(opendata, state);
+	nfs4_opendata_put(opendata);
+	return status;
+}
+
+static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = _nfs4_do_open_reclaim(ctx, state);
+		if (err != -NFS4ERR_DELAY)
+			break;
+		nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	struct nfs_open_context *ctx;
+	int ret;
+
+	ctx = nfs4_state_find_open_context(state);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+	ret = nfs4_do_open_reclaim(ctx, state);
+	put_nfs_open_context(ctx);
+	return ret;
+}
+
+static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
+{
+	struct nfs4_opendata *opendata;
+	int ret;
+
+	opendata = nfs4_open_recoverdata_alloc(ctx, state);
+	if (IS_ERR(opendata))
+		return PTR_ERR(opendata);
+	opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
+	nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
+	ret = nfs4_open_recover(opendata, state);
+	nfs4_opendata_put(opendata);
+	return ret;
+}
+
+int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
+{
+	struct nfs4_exception exception = { };
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	int err;
+	do {
+		err = _nfs4_open_delegation_recall(ctx, state, stateid);
+		switch (err) {
+			case 0:
+			case -ENOENT:
+			case -ESTALE:
+				goto out;
+			case -NFS4ERR_BADSESSION:
+			case -NFS4ERR_BADSLOT:
+			case -NFS4ERR_BAD_HIGH_SLOT:
+			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+			case -NFS4ERR_DEADSESSION:
+				nfs4_schedule_session_recovery(server->nfs_client->cl_session);
+				goto out;
+			case -NFS4ERR_STALE_CLIENTID:
+			case -NFS4ERR_STALE_STATEID:
+			case -NFS4ERR_EXPIRED:
+				/* Don't recall a delegation if it was lost */
+				nfs4_schedule_lease_recovery(server->nfs_client);
+				goto out;
+			case -ERESTARTSYS:
+				/*
+				 * The show must go on: exit, but mark the
+				 * stateid as needing recovery.
+				 */
+			case -NFS4ERR_DELEG_REVOKED:
+			case -NFS4ERR_ADMIN_REVOKED:
+			case -NFS4ERR_BAD_STATEID:
+				nfs_inode_find_state_and_recover(state->inode,
+						stateid);
+				nfs4_schedule_stateid_recovery(server, state);
+			case -EKEYEXPIRED:
+				/*
+				 * User RPCSEC_GSS context has expired.
+				 * We cannot recover this stateid now, so
+				 * skip it and allow recovery thread to
+				 * proceed.
+				 */
+			case -ENOMEM:
+				err = 0;
+				goto out;
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+
+	data->rpc_status = task->tk_status;
+	if (data->rpc_status == 0) {
+		nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
+		nfs_confirm_seqid(&data->owner->so_seqid, 0);
+		renew_lease(data->o_res.server, data->timestamp);
+		data->rpc_done = 1;
+	}
+}
+
+static void nfs4_open_confirm_release(void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+	struct nfs4_state *state = NULL;
+
+	/* If this request hasn't been cancelled, do nothing */
+	if (data->cancelled == 0)
+		goto out_free;
+	/* In case of error, no cleanup! */
+	if (!data->rpc_done)
+		goto out_free;
+	state = nfs4_opendata_to_nfs4_state(data);
+	if (!IS_ERR(state))
+		nfs4_close_state(state, data->o_arg.fmode);
+out_free:
+	nfs4_opendata_put(data);
+}
+
+static const struct rpc_call_ops nfs4_open_confirm_ops = {
+	.rpc_call_done = nfs4_open_confirm_done,
+	.rpc_release = nfs4_open_confirm_release,
+};
+
+/*
+ * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
+ */
+static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
+{
+	struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
+	struct rpc_task *task;
+	struct  rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
+		.rpc_argp = &data->c_arg,
+		.rpc_resp = &data->c_res,
+		.rpc_cred = data->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_open_confirm_ops,
+		.callback_data = data,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int status;
+
+	kref_get(&data->kref);
+	data->rpc_done = 0;
+	data->rpc_status = 0;
+	data->timestamp = jiffies;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = nfs4_wait_for_completion_rpc_task(task);
+	if (status != 0) {
+		data->cancelled = 1;
+		smp_wmb();
+	} else
+		status = data->rpc_status;
+	rpc_put_task(task);
+	return status;
+}
+
+static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+	struct nfs4_state_owner *sp = data->owner;
+
+	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
+		return;
+	/*
+	 * Check if we still need to send an OPEN call, or if we can use
+	 * a delegation instead.
+	 */
+	if (data->state != NULL) {
+		struct nfs_delegation *delegation;
+
+		if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
+			goto out_no_action;
+		rcu_read_lock();
+		delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
+		if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
+		    can_open_delegated(delegation, data->o_arg.fmode))
+			goto unlock_no_action;
+		rcu_read_unlock();
+	}
+	/* Update client id. */
+	data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
+	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
+		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
+		nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
+	}
+	data->timestamp = jiffies;
+	if (nfs4_setup_sequence(data->o_arg.server,
+				&data->o_arg.seq_args,
+				&data->o_res.seq_res, task))
+		return;
+	rpc_call_start(task);
+	return;
+unlock_no_action:
+	rcu_read_unlock();
+out_no_action:
+	task->tk_action = NULL;
+
+}
+
+static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
+{
+	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+	nfs4_open_prepare(task, calldata);
+}
+
+static void nfs4_open_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+
+	data->rpc_status = task->tk_status;
+
+	if (!nfs4_sequence_done(task, &data->o_res.seq_res))
+		return;
+
+	if (task->tk_status == 0) {
+		switch (data->o_res.f_attr->mode & S_IFMT) {
+			case S_IFREG:
+				break;
+			case S_IFLNK:
+				data->rpc_status = -ELOOP;
+				break;
+			case S_IFDIR:
+				data->rpc_status = -EISDIR;
+				break;
+			default:
+				data->rpc_status = -ENOTDIR;
+		}
+		renew_lease(data->o_res.server, data->timestamp);
+		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
+			nfs_confirm_seqid(&data->owner->so_seqid, 0);
+	}
+	data->rpc_done = 1;
+}
+
+static void nfs4_open_release(void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+	struct nfs4_state *state = NULL;
+
+	/* If this request hasn't been cancelled, do nothing */
+	if (data->cancelled == 0)
+		goto out_free;
+	/* In case of error, no cleanup! */
+	if (data->rpc_status != 0 || !data->rpc_done)
+		goto out_free;
+	/* In case we need an open_confirm, no cleanup! */
+	if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
+		goto out_free;
+	state = nfs4_opendata_to_nfs4_state(data);
+	if (!IS_ERR(state))
+		nfs4_close_state(state, data->o_arg.fmode);
+out_free:
+	nfs4_opendata_put(data);
+}
+
+static const struct rpc_call_ops nfs4_open_ops = {
+	.rpc_call_prepare = nfs4_open_prepare,
+	.rpc_call_done = nfs4_open_done,
+	.rpc_release = nfs4_open_release,
+};
+
+static const struct rpc_call_ops nfs4_recover_open_ops = {
+	.rpc_call_prepare = nfs4_recover_open_prepare,
+	.rpc_call_done = nfs4_open_done,
+	.rpc_release = nfs4_open_release,
+};
+
+static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
+{
+	struct inode *dir = data->dir->d_inode;
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_openargs *o_arg = &data->o_arg;
+	struct nfs_openres *o_res = &data->o_res;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
+		.rpc_argp = o_arg,
+		.rpc_resp = o_res,
+		.rpc_cred = data->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_open_ops,
+		.callback_data = data,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int status;
+
+	nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
+	kref_get(&data->kref);
+	data->rpc_done = 0;
+	data->rpc_status = 0;
+	data->cancelled = 0;
+	if (isrecover)
+		task_setup_data.callback_ops = &nfs4_recover_open_ops;
+	task = rpc_run_task(&task_setup_data);
+        if (IS_ERR(task))
+                return PTR_ERR(task);
+        status = nfs4_wait_for_completion_rpc_task(task);
+        if (status != 0) {
+                data->cancelled = 1;
+                smp_wmb();
+        } else
+                status = data->rpc_status;
+        rpc_put_task(task);
+
+	return status;
+}
+
+static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
+{
+	struct inode *dir = data->dir->d_inode;
+	struct nfs_openres *o_res = &data->o_res;
+        int status;
+
+	status = nfs4_run_open_task(data, 1);
+	if (status != 0 || !data->rpc_done)
+		return status;
+
+	nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
+
+	nfs_refresh_inode(dir, o_res->dir_attr);
+
+	if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
+		status = _nfs4_proc_open_confirm(data);
+		if (status != 0)
+			return status;
+	}
+
+	return status;
+}
+
+/*
+ * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
+ */
+static int _nfs4_proc_open(struct nfs4_opendata *data)
+{
+	struct inode *dir = data->dir->d_inode;
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_openargs *o_arg = &data->o_arg;
+	struct nfs_openres *o_res = &data->o_res;
+	int status;
+
+	status = nfs4_run_open_task(data, 0);
+	if (!data->rpc_done)
+		return status;
+	if (status != 0) {
+		if (status == -NFS4ERR_BADNAME &&
+				!(o_arg->open_flags & O_CREAT))
+			return -ENOENT;
+		return status;
+	}
+
+	nfs_fattr_map_and_free_names(server, &data->f_attr);
+
+	if (o_arg->open_flags & O_CREAT) {
+		update_changeattr(dir, &o_res->cinfo);
+		nfs_post_op_update_inode(dir, o_res->dir_attr);
+	} else
+		nfs_refresh_inode(dir, o_res->dir_attr);
+	if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
+		server->caps &= ~NFS_CAP_POSIX_LOCK;
+	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
+		status = _nfs4_proc_open_confirm(data);
+		if (status != 0)
+			return status;
+	}
+	if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
+		_nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
+	return 0;
+}
+
+static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
+{
+	unsigned int loop;
+	int ret;
+
+	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
+		ret = nfs4_wait_clnt_recover(clp);
+		if (ret != 0)
+			break;
+		if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
+		    !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
+			break;
+		nfs4_schedule_state_manager(clp);
+		ret = -EIO;
+	}
+	return ret;
+}
+
+static int nfs4_recover_expired_lease(struct nfs_server *server)
+{
+	return nfs4_client_recover_expired_lease(server->nfs_client);
+}
+
+/*
+ * OPEN_EXPIRED:
+ * 	reclaim state on the server after a network partition.
+ * 	Assumes caller holds the appropriate lock
+ */
+static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs4_opendata *opendata;
+	int ret;
+
+	opendata = nfs4_open_recoverdata_alloc(ctx, state);
+	if (IS_ERR(opendata))
+		return PTR_ERR(opendata);
+	ret = nfs4_open_recover(opendata, state);
+	if (ret == -ESTALE)
+		d_drop(ctx->dentry);
+	nfs4_opendata_put(opendata);
+	return ret;
+}
+
+static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = _nfs4_open_expired(ctx, state);
+		switch (err) {
+		default:
+			goto out;
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_DELAY:
+			nfs4_handle_exception(server, err, &exception);
+			err = 0;
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	struct nfs_open_context *ctx;
+	int ret;
+
+	ctx = nfs4_state_find_open_context(state);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+	ret = nfs4_do_open_expired(ctx, state);
+	put_nfs_open_context(ctx);
+	return ret;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
+{
+	int status = NFS_OK;
+	struct nfs_server *server = NFS_SERVER(state->inode);
+
+	if (state->flags & flags) {
+		status = nfs41_test_stateid(server, stateid);
+		if (status != NFS_OK) {
+			nfs41_free_stateid(server, stateid);
+			state->flags &= ~flags;
+		}
+	}
+	return status;
+}
+
+static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	int deleg_status, open_status;
+	int deleg_flags = 1 << NFS_DELEGATED_STATE;
+	int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
+
+	deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
+	open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
+
+	if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
+		return NFS_OK;
+	return nfs4_open_expired(sp, state);
+}
+#endif
+
+/*
+ * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
+ * fields corresponding to attributes that were used to store the verifier.
+ * Make sure we clobber those fields in the later setattr call
+ */
+static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
+{
+	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
+	    !(sattr->ia_valid & ATTR_ATIME_SET))
+		sattr->ia_valid |= ATTR_ATIME;
+
+	if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
+	    !(sattr->ia_valid & ATTR_MTIME_SET))
+		sattr->ia_valid |= ATTR_MTIME;
+}
+
+/*
+ * Returns a referenced nfs4_state
+ */
+static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
+{
+	struct nfs4_state_owner  *sp;
+	struct nfs4_state     *state = NULL;
+	struct nfs_server       *server = NFS_SERVER(dir);
+	struct nfs4_opendata *opendata;
+	int status;
+
+	/* Protect against reboot recovery conflicts */
+	status = -ENOMEM;
+	sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
+	if (sp == NULL) {
+		dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
+		goto out_err;
+	}
+	status = nfs4_recover_expired_lease(server);
+	if (status != 0)
+		goto err_put_state_owner;
+	if (dentry->d_inode != NULL)
+		nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
+	status = -ENOMEM;
+	opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
+	if (opendata == NULL)
+		goto err_put_state_owner;
+
+	if (dentry->d_inode != NULL)
+		opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
+
+	status = _nfs4_proc_open(opendata);
+	if (status != 0)
+		goto err_opendata_put;
+
+	state = nfs4_opendata_to_nfs4_state(opendata);
+	status = PTR_ERR(state);
+	if (IS_ERR(state))
+		goto err_opendata_put;
+	if (server->caps & NFS_CAP_POSIX_LOCK)
+		set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
+
+	if (opendata->o_arg.open_flags & O_EXCL) {
+		nfs4_exclusive_attrset(opendata, sattr);
+
+		nfs_fattr_init(opendata->o_res.f_attr);
+		status = nfs4_do_setattr(state->inode, cred,
+				opendata->o_res.f_attr, sattr,
+				state);
+		if (status == 0)
+			nfs_setattr_update_inode(state->inode, sattr);
+		nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
+	}
+	nfs4_opendata_put(opendata);
+	nfs4_put_state_owner(sp);
+	*res = state;
+	return 0;
+err_opendata_put:
+	nfs4_opendata_put(opendata);
+err_put_state_owner:
+	nfs4_put_state_owner(sp);
+out_err:
+	*res = NULL;
+	return status;
+}
+
+
+static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
+{
+	struct nfs4_exception exception = { };
+	struct nfs4_state *res;
+	int status;
+
+	fmode &= FMODE_READ|FMODE_WRITE;
+	do {
+		status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
+		if (status == 0)
+			break;
+		/* NOTE: BAD_SEQID means the server and client disagree about the
+		 * book-keeping w.r.t. state-changing operations
+		 * (OPEN/CLOSE/LOCK/LOCKU...)
+		 * It is actually a sign of a bug on the client or on the server.
+		 *
+		 * If we receive a BAD_SEQID error in the particular case of
+		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
+		 * have unhashed the old state_owner for us, and that we can
+		 * therefore safely retry using a new one. We should still warn
+		 * the user though...
+		 */
+		if (status == -NFS4ERR_BAD_SEQID) {
+			pr_warn_ratelimited("NFS: v4 server %s "
+					" returned a bad sequence-id error!\n",
+					NFS_SERVER(dir)->nfs_client->cl_hostname);
+			exception.retry = 1;
+			continue;
+		}
+		/*
+		 * BAD_STATEID on OPEN means that the server cancelled our
+		 * state before it received the OPEN_CONFIRM.
+		 * Recover by retrying the request as per the discussion
+		 * on Page 181 of RFC3530.
+		 */
+		if (status == -NFS4ERR_BAD_STATEID) {
+			exception.retry = 1;
+			continue;
+		}
+		if (status == -EAGAIN) {
+			/* We must have found a delegation */
+			exception.retry = 1;
+			continue;
+		}
+		res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
+					status, &exception));
+	} while (exception.retry);
+	return res;
+}
+
+static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
+			    struct nfs_fattr *fattr, struct iattr *sattr,
+			    struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+        struct nfs_setattrargs  arg = {
+                .fh             = NFS_FH(inode),
+                .iap            = sattr,
+		.server		= server,
+		.bitmask = server->attr_bitmask,
+        };
+        struct nfs_setattrres  res = {
+		.fattr		= fattr,
+		.server		= server,
+        };
+        struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
+		.rpc_argp	= &arg,
+		.rpc_resp	= &res,
+		.rpc_cred	= cred,
+        };
+	unsigned long timestamp = jiffies;
+	int status;
+
+	nfs_fattr_init(fattr);
+
+	if (state != NULL) {
+		nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
+				current->files, current->tgid);
+	} else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
+				FMODE_WRITE)) {
+		/* Use that stateid */
+	} else
+		nfs4_stateid_copy(&arg.stateid, &zero_stateid);
+
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	if (status == 0 && state != NULL)
+		renew_lease(server, timestamp);
+	return status;
+}
+
+static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
+			   struct nfs_fattr *fattr, struct iattr *sattr,
+			   struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_exception exception = {
+		.state = state,
+		.inode = inode,
+	};
+	int err;
+	do {
+		err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
+		switch (err) {
+		case -NFS4ERR_OPENMODE:
+			if (state && !(state->state & FMODE_WRITE)) {
+				err = -EBADF;
+				if (sattr->ia_valid & ATTR_OPEN)
+					err = -EACCES;
+				goto out;
+			}
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+out:
+	return err;
+}
+
+struct nfs4_closedata {
+	struct inode *inode;
+	struct nfs4_state *state;
+	struct nfs_closeargs arg;
+	struct nfs_closeres res;
+	struct nfs_fattr fattr;
+	unsigned long timestamp;
+	bool roc;
+	u32 roc_barrier;
+};
+
+static void nfs4_free_closedata(void *data)
+{
+	struct nfs4_closedata *calldata = data;
+	struct nfs4_state_owner *sp = calldata->state->owner;
+	struct super_block *sb = calldata->state->inode->i_sb;
+
+	if (calldata->roc)
+		pnfs_roc_release(calldata->state->inode);
+	nfs4_put_open_state(calldata->state);
+	nfs_free_seqid(calldata->arg.seqid);
+	nfs4_put_state_owner(sp);
+	nfs_sb_deactive(sb);
+	kfree(calldata);
+}
+
+static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
+		fmode_t fmode)
+{
+	spin_lock(&state->owner->so_lock);
+	if (!(fmode & FMODE_READ))
+		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+	if (!(fmode & FMODE_WRITE))
+		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+	clear_bit(NFS_O_RDWR_STATE, &state->flags);
+	spin_unlock(&state->owner->so_lock);
+}
+
+static void nfs4_close_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_closedata *calldata = data;
+	struct nfs4_state *state = calldata->state;
+	struct nfs_server *server = NFS_SERVER(calldata->inode);
+
+	dprintk("%s: begin!\n", __func__);
+	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
+		return;
+        /* hmm. we are done with the inode, and in the process of freeing
+	 * the state_owner. we keep this around to process errors
+	 */
+	switch (task->tk_status) {
+		case 0:
+			if (calldata->roc)
+				pnfs_roc_set_barrier(state->inode,
+						     calldata->roc_barrier);
+			nfs_set_open_stateid(state, &calldata->res.stateid, 0);
+			renew_lease(server, calldata->timestamp);
+			nfs4_close_clear_stateid_flags(state,
+					calldata->arg.fmode);
+			break;
+		case -NFS4ERR_STALE_STATEID:
+		case -NFS4ERR_OLD_STATEID:
+		case -NFS4ERR_BAD_STATEID:
+		case -NFS4ERR_EXPIRED:
+			if (calldata->arg.fmode == 0)
+				break;
+		default:
+			if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
+				rpc_restart_call_prepare(task);
+	}
+	nfs_release_seqid(calldata->arg.seqid);
+	nfs_refresh_inode(calldata->inode, calldata->res.fattr);
+	dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
+}
+
+static void nfs4_close_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_closedata *calldata = data;
+	struct nfs4_state *state = calldata->state;
+	int call_close = 0;
+
+	dprintk("%s: begin!\n", __func__);
+	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
+		return;
+
+	task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
+	calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
+	spin_lock(&state->owner->so_lock);
+	/* Calculate the change in open mode */
+	if (state->n_rdwr == 0) {
+		if (state->n_rdonly == 0) {
+			call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
+			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
+			calldata->arg.fmode &= ~FMODE_READ;
+		}
+		if (state->n_wronly == 0) {
+			call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
+			call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
+			calldata->arg.fmode &= ~FMODE_WRITE;
+		}
+	}
+	spin_unlock(&state->owner->so_lock);
+
+	if (!call_close) {
+		/* Note: exit _without_ calling nfs4_close_done */
+		task->tk_action = NULL;
+		goto out;
+	}
+
+	if (calldata->arg.fmode == 0) {
+		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
+		if (calldata->roc &&
+		    pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
+			rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
+				     task, NULL);
+			goto out;
+		}
+	}
+
+	nfs_fattr_init(calldata->res.fattr);
+	calldata->timestamp = jiffies;
+	if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
+				&calldata->arg.seq_args,
+				&calldata->res.seq_res,
+				task))
+		goto out;
+	rpc_call_start(task);
+out:
+	dprintk("%s: done!\n", __func__);
+}
+
+static const struct rpc_call_ops nfs4_close_ops = {
+	.rpc_call_prepare = nfs4_close_prepare,
+	.rpc_call_done = nfs4_close_done,
+	.rpc_release = nfs4_free_closedata,
+};
+
+/* 
+ * It is possible for data to be read/written from a mem-mapped file 
+ * after the sys_close call (which hits the vfs layer as a flush).
+ * This means that we can't safely call nfsv4 close on a file until 
+ * the inode is cleared. This in turn means that we are not good
+ * NFSv4 citizens - we do not indicate to the server to update the file's 
+ * share state even when we are done with one of the three share 
+ * stateid's in the inode.
+ *
+ * NOTE: Caller must be holding the sp->so_owner semaphore!
+ */
+int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_closedata *calldata;
+	struct nfs4_state_owner *sp = state->owner;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
+		.rpc_cred = state->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_close_ops,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int status = -ENOMEM;
+
+	calldata = kzalloc(sizeof(*calldata), gfp_mask);
+	if (calldata == NULL)
+		goto out;
+	nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
+	calldata->inode = state->inode;
+	calldata->state = state;
+	calldata->arg.fh = NFS_FH(state->inode);
+	calldata->arg.stateid = &state->open_stateid;
+	/* Serialization for the sequence id */
+	calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
+	if (calldata->arg.seqid == NULL)
+		goto out_free_calldata;
+	calldata->arg.fmode = 0;
+	calldata->arg.bitmask = server->cache_consistency_bitmask;
+	calldata->res.fattr = &calldata->fattr;
+	calldata->res.seqid = calldata->arg.seqid;
+	calldata->res.server = server;
+	calldata->roc = roc;
+	nfs_sb_active(calldata->inode->i_sb);
+
+	msg.rpc_argp = &calldata->arg;
+	msg.rpc_resp = &calldata->res;
+	task_setup_data.callback_data = calldata;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = 0;
+	if (wait)
+		status = rpc_wait_for_completion_task(task);
+	rpc_put_task(task);
+	return status;
+out_free_calldata:
+	kfree(calldata);
+out:
+	if (roc)
+		pnfs_roc_release(state->inode);
+	nfs4_put_open_state(state);
+	nfs4_put_state_owner(sp);
+	return status;
+}
+
+static struct inode *
+nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
+{
+	struct nfs4_state *state;
+
+	/* Protect against concurrent sillydeletes */
+	state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
+	if (IS_ERR(state))
+		return ERR_CAST(state);
+	ctx->state = state;
+	return igrab(state->inode);
+}
+
+static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
+{
+	if (ctx->state == NULL)
+		return;
+	if (is_sync)
+		nfs4_close_sync(ctx->state, ctx->mode);
+	else
+		nfs4_close_state(ctx->state, ctx->mode);
+}
+
+static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+	struct nfs4_server_caps_arg args = {
+		.fhandle = fhandle,
+	};
+	struct nfs4_server_caps_res res = {};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	if (status == 0) {
+		memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
+		server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
+				NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
+				NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
+				NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
+				NFS_CAP_CTIME|NFS_CAP_MTIME);
+		if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
+			server->caps |= NFS_CAP_ACLS;
+		if (res.has_links != 0)
+			server->caps |= NFS_CAP_HARDLINKS;
+		if (res.has_symlinks != 0)
+			server->caps |= NFS_CAP_SYMLINKS;
+		if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
+			server->caps |= NFS_CAP_FILEID;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
+			server->caps |= NFS_CAP_MODE;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
+			server->caps |= NFS_CAP_NLINK;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
+			server->caps |= NFS_CAP_OWNER;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
+			server->caps |= NFS_CAP_OWNER_GROUP;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
+			server->caps |= NFS_CAP_ATIME;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
+			server->caps |= NFS_CAP_CTIME;
+		if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
+			server->caps |= NFS_CAP_MTIME;
+
+		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
+		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
+		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
+		server->acl_bitmask = res.acl_bitmask;
+		server->fh_expire_type = res.fh_expire_type;
+	}
+
+	return status;
+}
+
+int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_server_capabilities(server, fhandle),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_fsinfo *info)
+{
+	struct nfs4_lookup_root_arg args = {
+		.bitmask = nfs4_fattr_bitmap,
+	};
+	struct nfs4_lookup_res res = {
+		.server = server,
+		.fattr = info->fattr,
+		.fh = fhandle,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	nfs_fattr_init(info->fattr);
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_fsinfo *info)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = _nfs4_lookup_root(server, fhandle, info);
+		switch (err) {
+		case 0:
+		case -NFS4ERR_WRONGSEC:
+			goto out;
+		default:
+			err = nfs4_handle_exception(server, err, &exception);
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
+				struct nfs_fsinfo *info, rpc_authflavor_t flavor)
+{
+	struct rpc_auth *auth;
+	int ret;
+
+	auth = rpcauth_create(flavor, server->client);
+	if (!auth) {
+		ret = -EIO;
+		goto out;
+	}
+	ret = nfs4_lookup_root(server, fhandle, info);
+out:
+	return ret;
+}
+
+static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
+			      struct nfs_fsinfo *info)
+{
+	int i, len, status = 0;
+	rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
+
+	len = gss_mech_list_pseudoflavors(&flav_array[0]);
+	flav_array[len] = RPC_AUTH_NULL;
+	len += 1;
+
+	for (i = 0; i < len; i++) {
+		status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
+		if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
+			continue;
+		break;
+	}
+	/*
+	 * -EACCESS could mean that the user doesn't have correct permissions
+	 * to access the mount.  It could also mean that we tried to mount
+	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
+	 * existing mount programs don't handle -EACCES very well so it should
+	 * be mapped to -EPERM instead.
+	 */
+	if (status == -EACCES)
+		status = -EPERM;
+	return status;
+}
+
+/*
+ * get the file handle for the "/" directory on the server
+ */
+static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
+			      struct nfs_fsinfo *info)
+{
+	int minor_version = server->nfs_client->cl_minorversion;
+	int status = nfs4_lookup_root(server, fhandle, info);
+	if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
+		/*
+		 * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
+		 * by nfs4_map_errors() as this function exits.
+		 */
+		status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
+	if (status == 0)
+		status = nfs4_server_capabilities(server, fhandle);
+	if (status == 0)
+		status = nfs4_do_fsinfo(server, fhandle, info);
+	return nfs4_map_errors(status);
+}
+
+/*
+ * Get locations and (maybe) other attributes of a referral.
+ * Note that we'll actually follow the referral later when
+ * we detect fsid mismatch in inode revalidation
+ */
+static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
+			     const struct qstr *name, struct nfs_fattr *fattr,
+			     struct nfs_fh *fhandle)
+{
+	int status = -ENOMEM;
+	struct page *page = NULL;
+	struct nfs4_fs_locations *locations = NULL;
+
+	page = alloc_page(GFP_KERNEL);
+	if (page == NULL)
+		goto out;
+	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
+	if (locations == NULL)
+		goto out;
+
+	status = nfs4_proc_fs_locations(client, dir, name, locations, page);
+	if (status != 0)
+		goto out;
+	/* Make sure server returned a different fsid for the referral */
+	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
+		dprintk("%s: server did not return a different fsid for"
+			" a referral at %s\n", __func__, name->name);
+		status = -EIO;
+		goto out;
+	}
+	/* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
+	nfs_fixup_referral_attributes(&locations->fattr);
+
+	/* replace the lookup nfs_fattr with the locations nfs_fattr */
+	memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
+	memset(fhandle, 0, sizeof(struct nfs_fh));
+out:
+	if (page)
+		__free_page(page);
+	kfree(locations);
+	return status;
+}
+
+static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct nfs4_getattr_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_getattr_res res = {
+		.fattr = fattr,
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	
+	nfs_fattr_init(fattr);
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_proc_getattr(server, fhandle, fattr),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/* 
+ * The file is not closed if it is opened due to the a request to change
+ * the size of the file. The open call will not be needed once the
+ * VFS layer lookup-intents are implemented.
+ *
+ * Close is called when the inode is destroyed.
+ * If we haven't opened the file for O_WRONLY, we
+ * need to in the size_change case to obtain a stateid.
+ *
+ * Got race?
+ * Because OPEN is always done by name in nfsv4, it is
+ * possible that we opened a different file by the same
+ * name.  We can recognize this race condition, but we
+ * can't do anything about it besides returning an error.
+ *
+ * This will be fixed with VFS changes (lookup-intent).
+ */
+static int
+nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
+		  struct iattr *sattr)
+{
+	struct inode *inode = dentry->d_inode;
+	struct rpc_cred *cred = NULL;
+	struct nfs4_state *state = NULL;
+	int status;
+
+	if (pnfs_ld_layoutret_on_setattr(inode))
+		pnfs_return_layout(inode);
+
+	nfs_fattr_init(fattr);
+	
+	/* Search for an existing open(O_WRITE) file */
+	if (sattr->ia_valid & ATTR_FILE) {
+		struct nfs_open_context *ctx;
+
+		ctx = nfs_file_open_context(sattr->ia_file);
+		if (ctx) {
+			cred = ctx->cred;
+			state = ctx->state;
+		}
+	}
+
+	/* Deal with open(O_TRUNC) */
+	if (sattr->ia_valid & ATTR_OPEN)
+		sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
+
+	status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
+	if (status == 0)
+		nfs_setattr_update_inode(inode, sattr);
+	return status;
+}
+
+static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
+		const struct qstr *name, struct nfs_fh *fhandle,
+		struct nfs_fattr *fattr)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	int		       status;
+	struct nfs4_lookup_arg args = {
+		.bitmask = server->attr_bitmask,
+		.dir_fh = NFS_FH(dir),
+		.name = name,
+	};
+	struct nfs4_lookup_res res = {
+		.server = server,
+		.fattr = fattr,
+		.fh = fhandle,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	nfs_fattr_init(fattr);
+
+	dprintk("NFS call  lookup %s\n", name->name);
+	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
+	dprintk("NFS reply lookup: %d\n", status);
+	return status;
+}
+
+static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
+{
+	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
+		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
+	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	fattr->nlink = 2;
+}
+
+static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
+				   struct qstr *name, struct nfs_fh *fhandle,
+				   struct nfs_fattr *fattr)
+{
+	struct nfs4_exception exception = { };
+	struct rpc_clnt *client = *clnt;
+	int err;
+	do {
+		err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
+		switch (err) {
+		case -NFS4ERR_BADNAME:
+			err = -ENOENT;
+			goto out;
+		case -NFS4ERR_MOVED:
+			err = nfs4_get_referral(client, dir, name, fattr, fhandle);
+			goto out;
+		case -NFS4ERR_WRONGSEC:
+			err = -EPERM;
+			if (client != *clnt)
+				goto out;
+
+			client = nfs4_create_sec_client(client, dir, name);
+			if (IS_ERR(client))
+				return PTR_ERR(client);
+
+			exception.retry = 1;
+			break;
+		default:
+			err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
+		}
+	} while (exception.retry);
+
+out:
+	if (err == 0)
+		*clnt = client;
+	else if (client != *clnt)
+		rpc_shutdown_client(client);
+
+	return err;
+}
+
+static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
+			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	int status;
+	struct rpc_clnt *client = NFS_CLIENT(dir);
+
+	status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
+	if (client != NFS_CLIENT(dir)) {
+		rpc_shutdown_client(client);
+		nfs_fixup_secinfo_attributes(fattr);
+	}
+	return status;
+}
+
+struct rpc_clnt *
+nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
+			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	int status;
+	struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
+
+	status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
+	if (status < 0) {
+		rpc_shutdown_client(client);
+		return ERR_PTR(status);
+	}
+	return client;
+}
+
+static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_accessargs args = {
+		.fh = NFS_FH(inode),
+		.bitmask = server->cache_consistency_bitmask,
+	};
+	struct nfs4_accessres res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = entry->cred,
+	};
+	int mode = entry->mask;
+	int status;
+
+	/*
+	 * Determine which access bits we want to ask for...
+	 */
+	if (mode & MAY_READ)
+		args.access |= NFS4_ACCESS_READ;
+	if (S_ISDIR(inode->i_mode)) {
+		if (mode & MAY_WRITE)
+			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
+		if (mode & MAY_EXEC)
+			args.access |= NFS4_ACCESS_LOOKUP;
+	} else {
+		if (mode & MAY_WRITE)
+			args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
+		if (mode & MAY_EXEC)
+			args.access |= NFS4_ACCESS_EXECUTE;
+	}
+
+	res.fattr = nfs_alloc_fattr();
+	if (res.fattr == NULL)
+		return -ENOMEM;
+
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	if (!status) {
+		entry->mask = 0;
+		if (res.access & NFS4_ACCESS_READ)
+			entry->mask |= MAY_READ;
+		if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
+			entry->mask |= MAY_WRITE;
+		if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
+			entry->mask |= MAY_EXEC;
+		nfs_refresh_inode(inode, res.fattr);
+	}
+	nfs_free_fattr(res.fattr);
+	return status;
+}
+
+static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(inode),
+				_nfs4_proc_access(inode, entry),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/*
+ * TODO: For the time being, we don't try to get any attributes
+ * along with any of the zero-copy operations READ, READDIR,
+ * READLINK, WRITE.
+ *
+ * In the case of the first three, we want to put the GETATTR
+ * after the read-type operation -- this is because it is hard
+ * to predict the length of a GETATTR response in v4, and thus
+ * align the READ data correctly.  This means that the GETATTR
+ * may end up partially falling into the page cache, and we should
+ * shift it into the 'tail' of the xdr_buf before processing.
+ * To do this efficiently, we need to know the total length
+ * of data received, which doesn't seem to be available outside
+ * of the RPC layer.
+ *
+ * In the case of WRITE, we also want to put the GETATTR after
+ * the operation -- in this case because we want to make sure
+ * we get the post-operation mtime and size.  This means that
+ * we can't use xdr_encode_pages() as written: we need a variant
+ * of it which would leave room in the 'tail' iovec.
+ *
+ * Both of these changes to the XDR layer would in fact be quite
+ * minor, but I decided to leave them for a subsequent patch.
+ */
+static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
+		unsigned int pgbase, unsigned int pglen)
+{
+	struct nfs4_readlink args = {
+		.fh       = NFS_FH(inode),
+		.pgbase	  = pgbase,
+		.pglen    = pglen,
+		.pages    = &page,
+	};
+	struct nfs4_readlink_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_readlink(struct inode *inode, struct page *page,
+		unsigned int pgbase, unsigned int pglen)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(inode),
+				_nfs4_proc_readlink(inode, page, pgbase, pglen),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/*
+ * Got race?
+ * We will need to arrange for the VFS layer to provide an atomic open.
+ * Until then, this create/open method is prone to inefficiency and race
+ * conditions due to the lookup, create, and open VFS calls from sys_open()
+ * placed on the wire.
+ *
+ * Given the above sorry state of affairs, I'm simply sending an OPEN.
+ * The file will be opened again in the subsequent VFS open call
+ * (nfs4_proc_file_open).
+ *
+ * The open for read will just hang around to be used by any process that
+ * opens the file O_RDONLY. This will all be resolved with the VFS changes.
+ */
+
+static int
+nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
+                 int flags, struct nfs_open_context *ctx)
+{
+	struct dentry *de = dentry;
+	struct nfs4_state *state;
+	struct rpc_cred *cred = NULL;
+	fmode_t fmode = 0;
+	int status = 0;
+
+	if (ctx != NULL) {
+		cred = ctx->cred;
+		de = ctx->dentry;
+		fmode = ctx->mode;
+	}
+	sattr->ia_mode &= ~current_umask();
+	state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
+	d_drop(dentry);
+	if (IS_ERR(state)) {
+		status = PTR_ERR(state);
+		goto out;
+	}
+	d_add(dentry, igrab(state->inode));
+	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+	if (ctx != NULL)
+		ctx->state = state;
+	else
+		nfs4_close_sync(state, fmode);
+out:
+	return status;
+}
+
+static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_removeargs args = {
+		.fh = NFS_FH(dir),
+		.name.len = name->len,
+		.name.name = name->name,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs_removeres res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status = -ENOMEM;
+
+	res.dir_attr = nfs_alloc_fattr();
+	if (res.dir_attr == NULL)
+		goto out;
+
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
+	if (status == 0) {
+		update_changeattr(dir, &res.cinfo);
+		nfs_post_op_update_inode(dir, res.dir_attr);
+	}
+	nfs_free_fattr(res.dir_attr);
+out:
+	return status;
+}
+
+static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				_nfs4_proc_remove(dir, name),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_removeargs *args = msg->rpc_argp;
+	struct nfs_removeres *res = msg->rpc_resp;
+
+	args->bitmask = server->cache_consistency_bitmask;
+	res->server = server;
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
+	nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
+}
+
+static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
+{
+	if (nfs4_setup_sequence(NFS_SERVER(data->dir),
+				&data->args.seq_args,
+				&data->res.seq_res,
+				task))
+		return;
+	rpc_call_start(task);
+}
+
+static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
+{
+	struct nfs_removeres *res = task->tk_msg.rpc_resp;
+
+	if (!nfs4_sequence_done(task, &res->seq_res))
+		return 0;
+	if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
+		return 0;
+	update_changeattr(dir, &res->cinfo);
+	nfs_post_op_update_inode(dir, res->dir_attr);
+	return 1;
+}
+
+static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_renameargs *arg = msg->rpc_argp;
+	struct nfs_renameres *res = msg->rpc_resp;
+
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
+	arg->bitmask = server->attr_bitmask;
+	res->server = server;
+	nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
+}
+
+static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
+{
+	if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
+				&data->args.seq_args,
+				&data->res.seq_res,
+				task))
+		return;
+	rpc_call_start(task);
+}
+
+static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
+				 struct inode *new_dir)
+{
+	struct nfs_renameres *res = task->tk_msg.rpc_resp;
+
+	if (!nfs4_sequence_done(task, &res->seq_res))
+		return 0;
+	if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
+		return 0;
+
+	update_changeattr(old_dir, &res->old_cinfo);
+	nfs_post_op_update_inode(old_dir, res->old_fattr);
+	update_changeattr(new_dir, &res->new_cinfo);
+	nfs_post_op_update_inode(new_dir, res->new_fattr);
+	return 1;
+}
+
+static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
+		struct inode *new_dir, struct qstr *new_name)
+{
+	struct nfs_server *server = NFS_SERVER(old_dir);
+	struct nfs_renameargs arg = {
+		.old_dir = NFS_FH(old_dir),
+		.new_dir = NFS_FH(new_dir),
+		.old_name = old_name,
+		.new_name = new_name,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs_renameres res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
+		.rpc_argp = &arg,
+		.rpc_resp = &res,
+	};
+	int status = -ENOMEM;
+	
+	res.old_fattr = nfs_alloc_fattr();
+	res.new_fattr = nfs_alloc_fattr();
+	if (res.old_fattr == NULL || res.new_fattr == NULL)
+		goto out;
+
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	if (!status) {
+		update_changeattr(old_dir, &res.old_cinfo);
+		nfs_post_op_update_inode(old_dir, res.old_fattr);
+		update_changeattr(new_dir, &res.new_cinfo);
+		nfs_post_op_update_inode(new_dir, res.new_fattr);
+	}
+out:
+	nfs_free_fattr(res.new_fattr);
+	nfs_free_fattr(res.old_fattr);
+	return status;
+}
+
+static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
+		struct inode *new_dir, struct qstr *new_name)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(old_dir),
+				_nfs4_proc_rename(old_dir, old_name,
+					new_dir, new_name),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_link_arg arg = {
+		.fh     = NFS_FH(inode),
+		.dir_fh = NFS_FH(dir),
+		.name   = name,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_link_res res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
+		.rpc_argp = &arg,
+		.rpc_resp = &res,
+	};
+	int status = -ENOMEM;
+
+	res.fattr = nfs_alloc_fattr();
+	res.dir_attr = nfs_alloc_fattr();
+	if (res.fattr == NULL || res.dir_attr == NULL)
+		goto out;
+
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	if (!status) {
+		update_changeattr(dir, &res.cinfo);
+		nfs_post_op_update_inode(dir, res.dir_attr);
+		nfs_post_op_update_inode(inode, res.fattr);
+	}
+out:
+	nfs_free_fattr(res.dir_attr);
+	nfs_free_fattr(res.fattr);
+	return status;
+}
+
+static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(inode),
+				_nfs4_proc_link(inode, dir, name),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+struct nfs4_createdata {
+	struct rpc_message msg;
+	struct nfs4_create_arg arg;
+	struct nfs4_create_res res;
+	struct nfs_fh fh;
+	struct nfs_fattr fattr;
+	struct nfs_fattr dir_fattr;
+};
+
+static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
+		struct qstr *name, struct iattr *sattr, u32 ftype)
+{
+	struct nfs4_createdata *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data != NULL) {
+		struct nfs_server *server = NFS_SERVER(dir);
+
+		data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
+		data->msg.rpc_argp = &data->arg;
+		data->msg.rpc_resp = &data->res;
+		data->arg.dir_fh = NFS_FH(dir);
+		data->arg.server = server;
+		data->arg.name = name;
+		data->arg.attrs = sattr;
+		data->arg.ftype = ftype;
+		data->arg.bitmask = server->attr_bitmask;
+		data->res.server = server;
+		data->res.fh = &data->fh;
+		data->res.fattr = &data->fattr;
+		data->res.dir_fattr = &data->dir_fattr;
+		nfs_fattr_init(data->res.fattr);
+		nfs_fattr_init(data->res.dir_fattr);
+	}
+	return data;
+}
+
+static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
+{
+	int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
+				    &data->arg.seq_args, &data->res.seq_res, 1);
+	if (status == 0) {
+		update_changeattr(dir, &data->res.dir_cinfo);
+		nfs_post_op_update_inode(dir, data->res.dir_fattr);
+		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
+	}
+	return status;
+}
+
+static void nfs4_free_createdata(struct nfs4_createdata *data)
+{
+	kfree(data);
+}
+
+static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
+		struct page *page, unsigned int len, struct iattr *sattr)
+{
+	struct nfs4_createdata *data;
+	int status = -ENAMETOOLONG;
+
+	if (len > NFS4_MAXPATHLEN)
+		goto out;
+
+	status = -ENOMEM;
+	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
+	if (data == NULL)
+		goto out;
+
+	data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
+	data->arg.u.symlink.pages = &page;
+	data->arg.u.symlink.len = len;
+	
+	status = nfs4_do_create(dir, dentry, data);
+
+	nfs4_free_createdata(data);
+out:
+	return status;
+}
+
+static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
+		struct page *page, unsigned int len, struct iattr *sattr)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				_nfs4_proc_symlink(dir, dentry, page,
+							len, sattr),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr)
+{
+	struct nfs4_createdata *data;
+	int status = -ENOMEM;
+
+	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
+	if (data == NULL)
+		goto out;
+
+	status = nfs4_do_create(dir, dentry, data);
+
+	nfs4_free_createdata(data);
+out:
+	return status;
+}
+
+static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	sattr->ia_mode &= ~current_umask();
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				_nfs4_proc_mkdir(dir, dentry, sattr),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
+		u64 cookie, struct page **pages, unsigned int count, int plus)
+{
+	struct inode		*dir = dentry->d_inode;
+	struct nfs4_readdir_arg args = {
+		.fh = NFS_FH(dir),
+		.pages = pages,
+		.pgbase = 0,
+		.count = count,
+		.bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
+		.plus = plus,
+	};
+	struct nfs4_readdir_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+	int			status;
+
+	dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
+			dentry->d_parent->d_name.name,
+			dentry->d_name.name,
+			(unsigned long long)cookie);
+	nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
+	res.pgbase = args.pgbase;
+	status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
+	if (status >= 0) {
+		memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
+		status += args.pgbase;
+	}
+
+	nfs_invalidate_atime(dir);
+
+	dprintk("%s: returns %d\n", __func__, status);
+	return status;
+}
+
+static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
+		u64 cookie, struct page **pages, unsigned int count, int plus)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
+				_nfs4_proc_readdir(dentry, cred, cookie,
+					pages, count, plus),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr, dev_t rdev)
+{
+	struct nfs4_createdata *data;
+	int mode = sattr->ia_mode;
+	int status = -ENOMEM;
+
+	BUG_ON(!(sattr->ia_valid & ATTR_MODE));
+	BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
+
+	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
+	if (data == NULL)
+		goto out;
+
+	if (S_ISFIFO(mode))
+		data->arg.ftype = NF4FIFO;
+	else if (S_ISBLK(mode)) {
+		data->arg.ftype = NF4BLK;
+		data->arg.u.device.specdata1 = MAJOR(rdev);
+		data->arg.u.device.specdata2 = MINOR(rdev);
+	}
+	else if (S_ISCHR(mode)) {
+		data->arg.ftype = NF4CHR;
+		data->arg.u.device.specdata1 = MAJOR(rdev);
+		data->arg.u.device.specdata2 = MINOR(rdev);
+	}
+	
+	status = nfs4_do_create(dir, dentry, data);
+
+	nfs4_free_createdata(data);
+out:
+	return status;
+}
+
+static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr, dev_t rdev)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	sattr->ia_mode &= ~current_umask();
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				_nfs4_proc_mknod(dir, dentry, sattr, rdev),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
+		 struct nfs_fsstat *fsstat)
+{
+	struct nfs4_statfs_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_statfs_res res = {
+		.fsstat = fsstat,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	nfs_fattr_init(fsstat->fattr);
+	return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_proc_statfs(server, fhandle, fsstat),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_fsinfo *fsinfo)
+{
+	struct nfs4_fsinfo_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_fsinfo_res res = {
+		.fsinfo = fsinfo,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_do_fsinfo(server, fhandle, fsinfo),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
+{
+	nfs_fattr_init(fsinfo->fattr);
+	return nfs4_do_fsinfo(server, fhandle, fsinfo);
+}
+
+static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_pathconf *pathconf)
+{
+	struct nfs4_pathconf_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_pathconf_res res = {
+		.pathconf = pathconf,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	/* None of the pathconf attributes are mandatory to implement */
+	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
+		memset(pathconf, 0, sizeof(*pathconf));
+		return 0;
+	}
+
+	nfs_fattr_init(pathconf->fattr);
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_pathconf *pathconf)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_proc_pathconf(server, fhandle, pathconf),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+void __nfs4_read_done_cb(struct nfs_read_data *data)
+{
+	nfs_invalidate_atime(data->inode);
+}
+
+static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
+{
+	struct nfs_server *server = NFS_SERVER(data->inode);
+
+	if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return -EAGAIN;
+	}
+
+	__nfs4_read_done_cb(data);
+	if (task->tk_status > 0)
+		renew_lease(server, data->timestamp);
+	return 0;
+}
+
+static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
+{
+
+	dprintk("--> %s\n", __func__);
+
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return -EAGAIN;
+
+	return data->read_done_cb ? data->read_done_cb(task, data) :
+				    nfs4_read_done_cb(task, data);
+}
+
+static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
+{
+	data->timestamp   = jiffies;
+	data->read_done_cb = nfs4_read_done_cb;
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+	nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
+}
+
+static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
+{
+	if (nfs4_setup_sequence(NFS_SERVER(data->inode),
+				&data->args.seq_args,
+				&data->res.seq_res,
+				task))
+		return;
+	rpc_call_start(task);
+}
+
+/* Reset the the nfs_read_data to send the read to the MDS. */
+void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
+{
+	dprintk("%s Reset task for i/o through\n", __func__);
+	put_lseg(data->lseg);
+	data->lseg = NULL;
+	/* offsets will differ in the dense stripe case */
+	data->args.offset = data->mds_offset;
+	data->ds_clp = NULL;
+	data->args.fh     = NFS_FH(data->inode);
+	data->read_done_cb = nfs4_read_done_cb;
+	task->tk_ops = data->mds_ops;
+	rpc_task_reset_client(task, NFS_CLIENT(data->inode));
+}
+EXPORT_SYMBOL_GPL(nfs4_reset_read);
+
+static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
+{
+	struct inode *inode = data->inode;
+	
+	if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return -EAGAIN;
+	}
+	if (task->tk_status >= 0) {
+		renew_lease(NFS_SERVER(inode), data->timestamp);
+		nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
+	}
+	return 0;
+}
+
+static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
+{
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return -EAGAIN;
+	return data->write_done_cb ? data->write_done_cb(task, data) :
+		nfs4_write_done_cb(task, data);
+}
+
+/* Reset the the nfs_write_data to send the write to the MDS. */
+void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
+{
+	dprintk("%s Reset task for i/o through\n", __func__);
+	put_lseg(data->lseg);
+	data->lseg          = NULL;
+	data->ds_clp        = NULL;
+	data->write_done_cb = nfs4_write_done_cb;
+	data->args.fh       = NFS_FH(data->inode);
+	data->args.bitmask  = data->res.server->cache_consistency_bitmask;
+	data->args.offset   = data->mds_offset;
+	data->res.fattr     = &data->fattr;
+	task->tk_ops        = data->mds_ops;
+	rpc_task_reset_client(task, NFS_CLIENT(data->inode));
+}
+EXPORT_SYMBOL_GPL(nfs4_reset_write);
+
+static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
+{
+	struct nfs_server *server = NFS_SERVER(data->inode);
+
+	if (data->lseg) {
+		data->args.bitmask = NULL;
+		data->res.fattr = NULL;
+	} else
+		data->args.bitmask = server->cache_consistency_bitmask;
+	if (!data->write_done_cb)
+		data->write_done_cb = nfs4_write_done_cb;
+	data->res.server = server;
+	data->timestamp   = jiffies;
+
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
+	nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
+}
+
+static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
+{
+	if (nfs4_setup_sequence(NFS_SERVER(data->inode),
+				&data->args.seq_args,
+				&data->res.seq_res,
+				task))
+		return;
+	rpc_call_start(task);
+}
+
+static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
+{
+	struct inode *inode = data->inode;
+
+	if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return -EAGAIN;
+	}
+	nfs_refresh_inode(inode, data->res.fattr);
+	return 0;
+}
+
+static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
+{
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return -EAGAIN;
+	return data->write_done_cb(task, data);
+}
+
+static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
+{
+	struct nfs_server *server = NFS_SERVER(data->inode);
+
+	if (data->lseg) {
+		data->args.bitmask = NULL;
+		data->res.fattr = NULL;
+	} else
+		data->args.bitmask = server->cache_consistency_bitmask;
+	if (!data->write_done_cb)
+		data->write_done_cb = nfs4_commit_done_cb;
+	data->res.server = server;
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
+	nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
+}
+
+struct nfs4_renewdata {
+	struct nfs_client	*client;
+	unsigned long		timestamp;
+};
+
+/*
+ * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
+ * standalone procedure for queueing an asynchronous RENEW.
+ */
+static void nfs4_renew_release(void *calldata)
+{
+	struct nfs4_renewdata *data = calldata;
+	struct nfs_client *clp = data->client;
+
+	if (atomic_read(&clp->cl_count) > 1)
+		nfs4_schedule_state_renewal(clp);
+	nfs_put_client(clp);
+	kfree(data);
+}
+
+static void nfs4_renew_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_renewdata *data = calldata;
+	struct nfs_client *clp = data->client;
+	unsigned long timestamp = data->timestamp;
+
+	if (task->tk_status < 0) {
+		/* Unless we're shutting down, schedule state recovery! */
+		if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
+			return;
+		if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
+			nfs4_schedule_lease_recovery(clp);
+			return;
+		}
+		nfs4_schedule_path_down_recovery(clp);
+	}
+	do_renew_lease(clp, timestamp);
+}
+
+static const struct rpc_call_ops nfs4_renew_ops = {
+	.rpc_call_done = nfs4_renew_done,
+	.rpc_release = nfs4_renew_release,
+};
+
+static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
+{
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
+		.rpc_argp	= clp,
+		.rpc_cred	= cred,
+	};
+	struct nfs4_renewdata *data;
+
+	if (renew_flags == 0)
+		return 0;
+	if (!atomic_inc_not_zero(&clp->cl_count))
+		return -EIO;
+	data = kmalloc(sizeof(*data), GFP_NOFS);
+	if (data == NULL)
+		return -ENOMEM;
+	data->client = clp;
+	data->timestamp = jiffies;
+	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
+			&nfs4_renew_ops, data);
+}
+
+static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
+{
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
+		.rpc_argp	= clp,
+		.rpc_cred	= cred,
+	};
+	unsigned long now = jiffies;
+	int status;
+
+	status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
+	if (status < 0)
+		return status;
+	do_renew_lease(clp, now);
+	return 0;
+}
+
+static inline int nfs4_server_supports_acls(struct nfs_server *server)
+{
+	return (server->caps & NFS_CAP_ACLS)
+		&& (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
+		&& (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
+}
+
+/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
+ * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
+ * the stack.
+ */
+#define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
+
+static int buf_to_pages_noslab(const void *buf, size_t buflen,
+		struct page **pages, unsigned int *pgbase)
+{
+	struct page *newpage, **spages;
+	int rc = 0;
+	size_t len;
+	spages = pages;
+
+	do {
+		len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
+		newpage = alloc_page(GFP_KERNEL);
+
+		if (newpage == NULL)
+			goto unwind;
+		memcpy(page_address(newpage), buf, len);
+                buf += len;
+                buflen -= len;
+		*pages++ = newpage;
+		rc++;
+	} while (buflen != 0);
+
+	return rc;
+
+unwind:
+	for(; rc > 0; rc--)
+		__free_page(spages[rc-1]);
+	return -ENOMEM;
+}
+
+struct nfs4_cached_acl {
+	int cached;
+	size_t len;
+	char data[0];
+};
+
+static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+
+	spin_lock(&inode->i_lock);
+	kfree(nfsi->nfs4_acl);
+	nfsi->nfs4_acl = acl;
+	spin_unlock(&inode->i_lock);
+}
+
+static void nfs4_zap_acl_attr(struct inode *inode)
+{
+	nfs4_set_cached_acl(inode, NULL);
+}
+
+static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs4_cached_acl *acl;
+	int ret = -ENOENT;
+
+	spin_lock(&inode->i_lock);
+	acl = nfsi->nfs4_acl;
+	if (acl == NULL)
+		goto out;
+	if (buf == NULL) /* user is just asking for length */
+		goto out_len;
+	if (acl->cached == 0)
+		goto out;
+	ret = -ERANGE; /* see getxattr(2) man page */
+	if (acl->len > buflen)
+		goto out;
+	memcpy(buf, acl->data, acl->len);
+out_len:
+	ret = acl->len;
+out:
+	spin_unlock(&inode->i_lock);
+	return ret;
+}
+
+static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
+{
+	struct nfs4_cached_acl *acl;
+
+	if (pages && acl_len <= PAGE_SIZE) {
+		acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
+		if (acl == NULL)
+			goto out;
+		acl->cached = 1;
+		_copy_from_pages(acl->data, pages, pgbase, acl_len);
+	} else {
+		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
+		if (acl == NULL)
+			goto out;
+		acl->cached = 0;
+	}
+	acl->len = acl_len;
+out:
+	nfs4_set_cached_acl(inode, acl);
+}
+
+/*
+ * The getxattr API returns the required buffer length when called with a
+ * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
+ * the required buf.  On a NULL buf, we send a page of data to the server
+ * guessing that the ACL request can be serviced by a page. If so, we cache
+ * up to the page of ACL data, and the 2nd call to getxattr is serviced by
+ * the cache. If not so, we throw away the page, and cache the required
+ * length. The next getxattr call will then produce another round trip to
+ * the server, this time with the input buf of the required size.
+ */
+static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
+{
+	struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
+	struct nfs_getaclargs args = {
+		.fh = NFS_FH(inode),
+		.acl_pages = pages,
+		.acl_len = buflen,
+	};
+	struct nfs_getaclres res = {
+		.acl_len = buflen,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int ret = -ENOMEM, npages, i, acl_len = 0;
+
+	npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	/* As long as we're doing a round trip to the server anyway,
+	 * let's be prepared for a page of acl data. */
+	if (npages == 0)
+		npages = 1;
+
+	/* Add an extra page to handle the bitmap returned */
+	npages++;
+
+	for (i = 0; i < npages; i++) {
+		pages[i] = alloc_page(GFP_KERNEL);
+		if (!pages[i])
+			goto out_free;
+	}
+
+	/* for decoding across pages */
+	res.acl_scratch = alloc_page(GFP_KERNEL);
+	if (!res.acl_scratch)
+		goto out_free;
+
+	args.acl_len = npages * PAGE_SIZE;
+	args.acl_pgbase = 0;
+
+	/* Let decode_getfacl know not to fail if the ACL data is larger than
+	 * the page we send as a guess */
+	if (buf == NULL)
+		res.acl_flags |= NFS4_ACL_LEN_REQUEST;
+
+	dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
+		__func__, buf, buflen, npages, args.acl_len);
+	ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
+			     &msg, &args.seq_args, &res.seq_res, 0);
+	if (ret)
+		goto out_free;
+
+	acl_len = res.acl_len - res.acl_data_offset;
+	if (acl_len > args.acl_len)
+		nfs4_write_cached_acl(inode, NULL, 0, acl_len);
+	else
+		nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
+				      acl_len);
+	if (buf) {
+		ret = -ERANGE;
+		if (acl_len > buflen)
+			goto out_free;
+		_copy_from_pages(buf, pages, res.acl_data_offset,
+				acl_len);
+	}
+	ret = acl_len;
+out_free:
+	for (i = 0; i < npages; i++)
+		if (pages[i])
+			__free_page(pages[i]);
+	if (res.acl_scratch)
+		__free_page(res.acl_scratch);
+	return ret;
+}
+
+static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
+{
+	struct nfs4_exception exception = { };
+	ssize_t ret;
+	do {
+		ret = __nfs4_get_acl_uncached(inode, buf, buflen);
+		if (ret >= 0)
+			break;
+		ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
+	} while (exception.retry);
+	return ret;
+}
+
+static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	int ret;
+
+	if (!nfs4_server_supports_acls(server))
+		return -EOPNOTSUPP;
+	ret = nfs_revalidate_inode(server, inode);
+	if (ret < 0)
+		return ret;
+	if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
+		nfs_zap_acl_cache(inode);
+	ret = nfs4_read_cached_acl(inode, buf, buflen);
+	if (ret != -ENOENT)
+		/* -ENOENT is returned if there is no ACL or if there is an ACL
+		 * but no cached acl data, just the acl length */
+		return ret;
+	return nfs4_get_acl_uncached(inode, buf, buflen);
+}
+
+static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct page *pages[NFS4ACL_MAXPAGES];
+	struct nfs_setaclargs arg = {
+		.fh		= NFS_FH(inode),
+		.acl_pages	= pages,
+		.acl_len	= buflen,
+	};
+	struct nfs_setaclres res;
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETACL],
+		.rpc_argp	= &arg,
+		.rpc_resp	= &res,
+	};
+	int ret, i;
+
+	if (!nfs4_server_supports_acls(server))
+		return -EOPNOTSUPP;
+	i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
+	if (i < 0)
+		return i;
+	nfs_inode_return_delegation(inode);
+	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+
+	/*
+	 * Free each page after tx, so the only ref left is
+	 * held by the network stack
+	 */
+	for (; i > 0; i--)
+		put_page(pages[i-1]);
+
+	/*
+	 * Acl update can result in inode attribute update.
+	 * so mark the attribute cache invalid.
+	 */
+	spin_lock(&inode->i_lock);
+	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
+	spin_unlock(&inode->i_lock);
+	nfs_access_zap_cache(inode);
+	nfs_zap_acl_cache(inode);
+	return ret;
+}
+
+static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(inode),
+				__nfs4_proc_set_acl(inode, buf, buflen),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int
+nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
+{
+	struct nfs_client *clp = server->nfs_client;
+
+	if (task->tk_status >= 0)
+		return 0;
+	switch(task->tk_status) {
+		case -NFS4ERR_DELEG_REVOKED:
+		case -NFS4ERR_ADMIN_REVOKED:
+		case -NFS4ERR_BAD_STATEID:
+			if (state == NULL)
+				break;
+			nfs_remove_bad_delegation(state->inode);
+		case -NFS4ERR_OPENMODE:
+			if (state == NULL)
+				break;
+			nfs4_schedule_stateid_recovery(server, state);
+			goto wait_on_recovery;
+		case -NFS4ERR_EXPIRED:
+			if (state != NULL)
+				nfs4_schedule_stateid_recovery(server, state);
+		case -NFS4ERR_STALE_STATEID:
+		case -NFS4ERR_STALE_CLIENTID:
+			nfs4_schedule_lease_recovery(clp);
+			goto wait_on_recovery;
+#if defined(CONFIG_NFS_V4_1)
+		case -NFS4ERR_BADSESSION:
+		case -NFS4ERR_BADSLOT:
+		case -NFS4ERR_BAD_HIGH_SLOT:
+		case -NFS4ERR_DEADSESSION:
+		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+		case -NFS4ERR_SEQ_FALSE_RETRY:
+		case -NFS4ERR_SEQ_MISORDERED:
+			dprintk("%s ERROR %d, Reset session\n", __func__,
+				task->tk_status);
+			nfs4_schedule_session_recovery(clp->cl_session);
+			task->tk_status = 0;
+			return -EAGAIN;
+#endif /* CONFIG_NFS_V4_1 */
+		case -NFS4ERR_DELAY:
+			nfs_inc_server_stats(server, NFSIOS_DELAY);
+		case -NFS4ERR_GRACE:
+		case -EKEYEXPIRED:
+			rpc_delay(task, NFS4_POLL_RETRY_MAX);
+			task->tk_status = 0;
+			return -EAGAIN;
+		case -NFS4ERR_RETRY_UNCACHED_REP:
+		case -NFS4ERR_OLD_STATEID:
+			task->tk_status = 0;
+			return -EAGAIN;
+	}
+	task->tk_status = nfs4_map_errors(task->tk_status);
+	return 0;
+wait_on_recovery:
+	rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
+	if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
+		rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
+	task->tk_status = 0;
+	return -EAGAIN;
+}
+
+static void nfs4_construct_boot_verifier(struct nfs_client *clp,
+					 nfs4_verifier *bootverf)
+{
+	__be32 verf[2];
+
+	verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
+	verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
+	memcpy(bootverf->data, verf, sizeof(bootverf->data));
+}
+
+int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
+		unsigned short port, struct rpc_cred *cred,
+		struct nfs4_setclientid_res *res)
+{
+	nfs4_verifier sc_verifier;
+	struct nfs4_setclientid setclientid = {
+		.sc_verifier = &sc_verifier,
+		.sc_prog = program,
+		.sc_cb_ident = clp->cl_cb_ident,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
+		.rpc_argp = &setclientid,
+		.rpc_resp = res,
+		.rpc_cred = cred,
+	};
+	int loop = 0;
+	int status;
+
+	nfs4_construct_boot_verifier(clp, &sc_verifier);
+
+	for(;;) {
+		rcu_read_lock();
+		setclientid.sc_name_len = scnprintf(setclientid.sc_name,
+				sizeof(setclientid.sc_name), "%s/%s %s %s %u",
+				clp->cl_ipaddr,
+				rpc_peeraddr2str(clp->cl_rpcclient,
+							RPC_DISPLAY_ADDR),
+				rpc_peeraddr2str(clp->cl_rpcclient,
+							RPC_DISPLAY_PROTO),
+				clp->cl_rpcclient->cl_auth->au_ops->au_name,
+				clp->cl_id_uniquifier);
+		setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
+				sizeof(setclientid.sc_netid),
+				rpc_peeraddr2str(clp->cl_rpcclient,
+							RPC_DISPLAY_NETID));
+		setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
+				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
+				clp->cl_ipaddr, port >> 8, port & 255);
+		rcu_read_unlock();
+
+		status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+		if (status != -NFS4ERR_CLID_INUSE)
+			break;
+		if (loop != 0) {
+			++clp->cl_id_uniquifier;
+			break;
+		}
+		++loop;
+		ssleep(clp->cl_lease_time / HZ + 1);
+	}
+	return status;
+}
+
+int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
+		struct nfs4_setclientid_res *arg,
+		struct rpc_cred *cred)
+{
+	struct nfs_fsinfo fsinfo;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
+		.rpc_argp = arg,
+		.rpc_resp = &fsinfo,
+		.rpc_cred = cred,
+	};
+	unsigned long now;
+	int status;
+
+	now = jiffies;
+	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+	if (status == 0) {
+		spin_lock(&clp->cl_lock);
+		clp->cl_lease_time = fsinfo.lease_time * HZ;
+		clp->cl_last_renewal = now;
+		spin_unlock(&clp->cl_lock);
+	}
+	return status;
+}
+
+struct nfs4_delegreturndata {
+	struct nfs4_delegreturnargs args;
+	struct nfs4_delegreturnres res;
+	struct nfs_fh fh;
+	nfs4_stateid stateid;
+	unsigned long timestamp;
+	struct nfs_fattr fattr;
+	int rpc_status;
+};
+
+static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_delegreturndata *data = calldata;
+
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return;
+
+	switch (task->tk_status) {
+	case -NFS4ERR_STALE_STATEID:
+	case -NFS4ERR_EXPIRED:
+	case 0:
+		renew_lease(data->res.server, data->timestamp);
+		break;
+	default:
+		if (nfs4_async_handle_error(task, data->res.server, NULL) ==
+				-EAGAIN) {
+			rpc_restart_call_prepare(task);
+			return;
+		}
+	}
+	data->rpc_status = task->tk_status;
+}
+
+static void nfs4_delegreturn_release(void *calldata)
+{
+	kfree(calldata);
+}
+
+#if defined(CONFIG_NFS_V4_1)
+static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_delegreturndata *d_data;
+
+	d_data = (struct nfs4_delegreturndata *)data;
+
+	if (nfs4_setup_sequence(d_data->res.server,
+				&d_data->args.seq_args,
+				&d_data->res.seq_res, task))
+		return;
+	rpc_call_start(task);
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+static const struct rpc_call_ops nfs4_delegreturn_ops = {
+#if defined(CONFIG_NFS_V4_1)
+	.rpc_call_prepare = nfs4_delegreturn_prepare,
+#endif /* CONFIG_NFS_V4_1 */
+	.rpc_call_done = nfs4_delegreturn_done,
+	.rpc_release = nfs4_delegreturn_release,
+};
+
+static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
+{
+	struct nfs4_delegreturndata *data;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_delegreturn_ops,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int status = 0;
+
+	data = kzalloc(sizeof(*data), GFP_NOFS);
+	if (data == NULL)
+		return -ENOMEM;
+	nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
+	data->args.fhandle = &data->fh;
+	data->args.stateid = &data->stateid;
+	data->args.bitmask = server->attr_bitmask;
+	nfs_copy_fh(&data->fh, NFS_FH(inode));
+	nfs4_stateid_copy(&data->stateid, stateid);
+	data->res.fattr = &data->fattr;
+	data->res.server = server;
+	nfs_fattr_init(data->res.fattr);
+	data->timestamp = jiffies;
+	data->rpc_status = 0;
+
+	task_setup_data.callback_data = data;
+	msg.rpc_argp = &data->args;
+	msg.rpc_resp = &data->res;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	if (!issync)
+		goto out;
+	status = nfs4_wait_for_completion_rpc_task(task);
+	if (status != 0)
+		goto out;
+	status = data->rpc_status;
+	if (status != 0)
+		goto out;
+	nfs_refresh_inode(inode, &data->fattr);
+out:
+	rpc_put_task(task);
+	return status;
+}
+
+int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
+		switch (err) {
+			case -NFS4ERR_STALE_STATEID:
+			case -NFS4ERR_EXPIRED:
+			case 0:
+				return 0;
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
+#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
+
+/* 
+ * sleep, with exponential backoff, and retry the LOCK operation. 
+ */
+static unsigned long
+nfs4_set_lock_task_retry(unsigned long timeout)
+{
+	freezable_schedule_timeout_killable(timeout);
+	timeout <<= 1;
+	if (timeout > NFS4_LOCK_MAXTIMEOUT)
+		return NFS4_LOCK_MAXTIMEOUT;
+	return timeout;
+}
+
+static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct inode *inode = state->inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs_lockt_args arg = {
+		.fh = NFS_FH(inode),
+		.fl = request,
+	};
+	struct nfs_lockt_res res = {
+		.denied = request,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
+		.rpc_argp       = &arg,
+		.rpc_resp       = &res,
+		.rpc_cred	= state->owner->so_cred,
+	};
+	struct nfs4_lock_state *lsp;
+	int status;
+
+	arg.lock_owner.clientid = clp->cl_clientid;
+	status = nfs4_set_lock_state(state, request);
+	if (status != 0)
+		goto out;
+	lsp = request->fl_u.nfs4_fl.owner;
+	arg.lock_owner.id = lsp->ls_seqid.owner_id;
+	arg.lock_owner.s_dev = server->s_dev;
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	switch (status) {
+		case 0:
+			request->fl_type = F_UNLCK;
+			break;
+		case -NFS4ERR_DENIED:
+			status = 0;
+	}
+	request->fl_ops->fl_release_private(request);
+out:
+	return status;
+}
+
+static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(state->inode),
+				_nfs4_proc_getlk(state, cmd, request),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int do_vfs_lock(struct file *file, struct file_lock *fl)
+{
+	int res = 0;
+	switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
+		case FL_POSIX:
+			res = posix_lock_file_wait(file, fl);
+			break;
+		case FL_FLOCK:
+			res = flock_lock_file_wait(file, fl);
+			break;
+		default:
+			BUG();
+	}
+	return res;
+}
+
+struct nfs4_unlockdata {
+	struct nfs_locku_args arg;
+	struct nfs_locku_res res;
+	struct nfs4_lock_state *lsp;
+	struct nfs_open_context *ctx;
+	struct file_lock fl;
+	const struct nfs_server *server;
+	unsigned long timestamp;
+};
+
+static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
+		struct nfs_open_context *ctx,
+		struct nfs4_lock_state *lsp,
+		struct nfs_seqid *seqid)
+{
+	struct nfs4_unlockdata *p;
+	struct inode *inode = lsp->ls_state->inode;
+
+	p = kzalloc(sizeof(*p), GFP_NOFS);
+	if (p == NULL)
+		return NULL;
+	p->arg.fh = NFS_FH(inode);
+	p->arg.fl = &p->fl;
+	p->arg.seqid = seqid;
+	p->res.seqid = seqid;
+	p->arg.stateid = &lsp->ls_stateid;
+	p->lsp = lsp;
+	atomic_inc(&lsp->ls_count);
+	/* Ensure we don't close file until we're done freeing locks! */
+	p->ctx = get_nfs_open_context(ctx);
+	memcpy(&p->fl, fl, sizeof(p->fl));
+	p->server = NFS_SERVER(inode);
+	return p;
+}
+
+static void nfs4_locku_release_calldata(void *data)
+{
+	struct nfs4_unlockdata *calldata = data;
+	nfs_free_seqid(calldata->arg.seqid);
+	nfs4_put_lock_state(calldata->lsp);
+	put_nfs_open_context(calldata->ctx);
+	kfree(calldata);
+}
+
+static void nfs4_locku_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_unlockdata *calldata = data;
+
+	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
+		return;
+	switch (task->tk_status) {
+		case 0:
+			nfs4_stateid_copy(&calldata->lsp->ls_stateid,
+					&calldata->res.stateid);
+			renew_lease(calldata->server, calldata->timestamp);
+			break;
+		case -NFS4ERR_BAD_STATEID:
+		case -NFS4ERR_OLD_STATEID:
+		case -NFS4ERR_STALE_STATEID:
+		case -NFS4ERR_EXPIRED:
+			break;
+		default:
+			if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
+				rpc_restart_call_prepare(task);
+	}
+}
+
+static void nfs4_locku_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_unlockdata *calldata = data;
+
+	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
+		return;
+	if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
+		/* Note: exit _without_ running nfs4_locku_done */
+		task->tk_action = NULL;
+		return;
+	}
+	calldata->timestamp = jiffies;
+	if (nfs4_setup_sequence(calldata->server,
+				&calldata->arg.seq_args,
+				&calldata->res.seq_res, task))
+		return;
+	rpc_call_start(task);
+}
+
+static const struct rpc_call_ops nfs4_locku_ops = {
+	.rpc_call_prepare = nfs4_locku_prepare,
+	.rpc_call_done = nfs4_locku_done,
+	.rpc_release = nfs4_locku_release_calldata,
+};
+
+static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
+		struct nfs_open_context *ctx,
+		struct nfs4_lock_state *lsp,
+		struct nfs_seqid *seqid)
+{
+	struct nfs4_unlockdata *data;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
+		.rpc_cred = ctx->cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_locku_ops,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC,
+	};
+
+	/* Ensure this is an unlock - when canceling a lock, the
+	 * canceled lock is passed in, and it won't be an unlock.
+	 */
+	fl->fl_type = F_UNLCK;
+
+	data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
+	if (data == NULL) {
+		nfs_free_seqid(seqid);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
+	msg.rpc_argp = &data->arg;
+	msg.rpc_resp = &data->res;
+	task_setup_data.callback_data = data;
+	return rpc_run_task(&task_setup_data);
+}
+
+static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs_seqid *seqid;
+	struct nfs4_lock_state *lsp;
+	struct rpc_task *task;
+	int status = 0;
+	unsigned char fl_flags = request->fl_flags;
+
+	status = nfs4_set_lock_state(state, request);
+	/* Unlock _before_ we do the RPC call */
+	request->fl_flags |= FL_EXISTS;
+	down_read(&nfsi->rwsem);
+	if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
+		up_read(&nfsi->rwsem);
+		goto out;
+	}
+	up_read(&nfsi->rwsem);
+	if (status != 0)
+		goto out;
+	/* Is this a delegated lock? */
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags))
+		goto out;
+	lsp = request->fl_u.nfs4_fl.owner;
+	seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
+	status = -ENOMEM;
+	if (seqid == NULL)
+		goto out;
+	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
+	status = PTR_ERR(task);
+	if (IS_ERR(task))
+		goto out;
+	status = nfs4_wait_for_completion_rpc_task(task);
+	rpc_put_task(task);
+out:
+	request->fl_flags = fl_flags;
+	return status;
+}
+
+struct nfs4_lockdata {
+	struct nfs_lock_args arg;
+	struct nfs_lock_res res;
+	struct nfs4_lock_state *lsp;
+	struct nfs_open_context *ctx;
+	struct file_lock fl;
+	unsigned long timestamp;
+	int rpc_status;
+	int cancelled;
+	struct nfs_server *server;
+};
+
+static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
+		struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
+		gfp_t gfp_mask)
+{
+	struct nfs4_lockdata *p;
+	struct inode *inode = lsp->ls_state->inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+
+	p = kzalloc(sizeof(*p), gfp_mask);
+	if (p == NULL)
+		return NULL;
+
+	p->arg.fh = NFS_FH(inode);
+	p->arg.fl = &p->fl;
+	p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
+	if (p->arg.open_seqid == NULL)
+		goto out_free;
+	p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
+	if (p->arg.lock_seqid == NULL)
+		goto out_free_seqid;
+	p->arg.lock_stateid = &lsp->ls_stateid;
+	p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
+	p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
+	p->arg.lock_owner.s_dev = server->s_dev;
+	p->res.lock_seqid = p->arg.lock_seqid;
+	p->lsp = lsp;
+	p->server = server;
+	atomic_inc(&lsp->ls_count);
+	p->ctx = get_nfs_open_context(ctx);
+	memcpy(&p->fl, fl, sizeof(p->fl));
+	return p;
+out_free_seqid:
+	nfs_free_seqid(p->arg.open_seqid);
+out_free:
+	kfree(p);
+	return NULL;
+}
+
+static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_lockdata *data = calldata;
+	struct nfs4_state *state = data->lsp->ls_state;
+
+	dprintk("%s: begin!\n", __func__);
+	if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
+		return;
+	/* Do we need to do an open_to_lock_owner? */
+	if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
+		if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
+			return;
+		data->arg.open_stateid = &state->stateid;
+		data->arg.new_lock_owner = 1;
+		data->res.open_seqid = data->arg.open_seqid;
+	} else
+		data->arg.new_lock_owner = 0;
+	data->timestamp = jiffies;
+	if (nfs4_setup_sequence(data->server,
+				&data->arg.seq_args,
+				&data->res.seq_res, task))
+		return;
+	rpc_call_start(task);
+	dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
+}
+
+static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
+{
+	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+	nfs4_lock_prepare(task, calldata);
+}
+
+static void nfs4_lock_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_lockdata *data = calldata;
+
+	dprintk("%s: begin!\n", __func__);
+
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return;
+
+	data->rpc_status = task->tk_status;
+	if (data->arg.new_lock_owner != 0) {
+		if (data->rpc_status == 0)
+			nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
+		else
+			goto out;
+	}
+	if (data->rpc_status == 0) {
+		nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
+		data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
+		renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
+	}
+out:
+	dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
+}
+
+static void nfs4_lock_release(void *calldata)
+{
+	struct nfs4_lockdata *data = calldata;
+
+	dprintk("%s: begin!\n", __func__);
+	nfs_free_seqid(data->arg.open_seqid);
+	if (data->cancelled != 0) {
+		struct rpc_task *task;
+		task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
+				data->arg.lock_seqid);
+		if (!IS_ERR(task))
+			rpc_put_task_async(task);
+		dprintk("%s: cancelling lock!\n", __func__);
+	} else
+		nfs_free_seqid(data->arg.lock_seqid);
+	nfs4_put_lock_state(data->lsp);
+	put_nfs_open_context(data->ctx);
+	kfree(data);
+	dprintk("%s: done!\n", __func__);
+}
+
+static const struct rpc_call_ops nfs4_lock_ops = {
+	.rpc_call_prepare = nfs4_lock_prepare,
+	.rpc_call_done = nfs4_lock_done,
+	.rpc_release = nfs4_lock_release,
+};
+
+static const struct rpc_call_ops nfs4_recover_lock_ops = {
+	.rpc_call_prepare = nfs4_recover_lock_prepare,
+	.rpc_call_done = nfs4_lock_done,
+	.rpc_release = nfs4_lock_release,
+};
+
+static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
+{
+	switch (error) {
+	case -NFS4ERR_ADMIN_REVOKED:
+	case -NFS4ERR_BAD_STATEID:
+		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
+		if (new_lock_owner != 0 ||
+		   (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
+			nfs4_schedule_stateid_recovery(server, lsp->ls_state);
+		break;
+	case -NFS4ERR_STALE_STATEID:
+		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
+	case -NFS4ERR_EXPIRED:
+		nfs4_schedule_lease_recovery(server->nfs_client);
+	};
+}
+
+static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
+{
+	struct nfs4_lockdata *data;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
+		.rpc_cred = state->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = NFS_CLIENT(state->inode),
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_lock_ops,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int ret;
+
+	dprintk("%s: begin!\n", __func__);
+	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
+			fl->fl_u.nfs4_fl.owner,
+			recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
+	if (data == NULL)
+		return -ENOMEM;
+	if (IS_SETLKW(cmd))
+		data->arg.block = 1;
+	if (recovery_type > NFS_LOCK_NEW) {
+		if (recovery_type == NFS_LOCK_RECLAIM)
+			data->arg.reclaim = NFS_LOCK_RECLAIM;
+		task_setup_data.callback_ops = &nfs4_recover_lock_ops;
+	}
+	nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
+	msg.rpc_argp = &data->arg;
+	msg.rpc_resp = &data->res;
+	task_setup_data.callback_data = data;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	ret = nfs4_wait_for_completion_rpc_task(task);
+	if (ret == 0) {
+		ret = data->rpc_status;
+		if (ret)
+			nfs4_handle_setlk_error(data->server, data->lsp,
+					data->arg.new_lock_owner, ret);
+	} else
+		data->cancelled = 1;
+	rpc_put_task(task);
+	dprintk("%s: done, ret = %d!\n", __func__, ret);
+	return ret;
+}
+
+static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = {
+		.inode = state->inode,
+	};
+	int err;
+
+	do {
+		/* Cache the lock if possible... */
+		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
+			return 0;
+		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
+		if (err != -NFS4ERR_DELAY)
+			break;
+		nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = {
+		.inode = state->inode,
+	};
+	int err;
+
+	err = nfs4_set_lock_state(state, request);
+	if (err != 0)
+		return err;
+	do {
+		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
+			return 0;
+		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
+		switch (err) {
+		default:
+			goto out;
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_DELAY:
+			nfs4_handle_exception(server, err, &exception);
+			err = 0;
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+static int nfs41_check_expired_locks(struct nfs4_state *state)
+{
+	int status, ret = NFS_OK;
+	struct nfs4_lock_state *lsp;
+	struct nfs_server *server = NFS_SERVER(state->inode);
+
+	list_for_each_entry(lsp, &state->lock_states, ls_locks) {
+		if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
+			status = nfs41_test_stateid(server, &lsp->ls_stateid);
+			if (status != NFS_OK) {
+				nfs41_free_stateid(server, &lsp->ls_stateid);
+				lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
+				ret = status;
+			}
+		}
+	};
+
+	return ret;
+}
+
+static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
+{
+	int status = NFS_OK;
+
+	if (test_bit(LK_STATE_IN_USE, &state->flags))
+		status = nfs41_check_expired_locks(state);
+	if (status == NFS_OK)
+		return status;
+	return nfs4_lock_expired(state, request);
+}
+#endif
+
+static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	unsigned char fl_flags = request->fl_flags;
+	int status = -ENOLCK;
+
+	if ((fl_flags & FL_POSIX) &&
+			!test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
+		goto out;
+	/* Is this a delegated open? */
+	status = nfs4_set_lock_state(state, request);
+	if (status != 0)
+		goto out;
+	request->fl_flags |= FL_ACCESS;
+	status = do_vfs_lock(request->fl_file, request);
+	if (status < 0)
+		goto out;
+	down_read(&nfsi->rwsem);
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
+		/* Yes: cache locks! */
+		/* ...but avoid races with delegation recall... */
+		request->fl_flags = fl_flags & ~FL_SLEEP;
+		status = do_vfs_lock(request->fl_file, request);
+		goto out_unlock;
+	}
+	status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
+	if (status != 0)
+		goto out_unlock;
+	/* Note: we always want to sleep here! */
+	request->fl_flags = fl_flags | FL_SLEEP;
+	if (do_vfs_lock(request->fl_file, request) < 0)
+		printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
+			"manager!\n", __func__);
+out_unlock:
+	up_read(&nfsi->rwsem);
+out:
+	request->fl_flags = fl_flags;
+	return status;
+}
+
+static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs4_exception exception = {
+		.state = state,
+		.inode = state->inode,
+	};
+	int err;
+
+	do {
+		err = _nfs4_proc_setlk(state, cmd, request);
+		if (err == -NFS4ERR_DENIED)
+			err = -EAGAIN;
+		err = nfs4_handle_exception(NFS_SERVER(state->inode),
+				err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int
+nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
+{
+	struct nfs_open_context *ctx;
+	struct nfs4_state *state;
+	unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
+	int status;
+
+	/* verify open state */
+	ctx = nfs_file_open_context(filp);
+	state = ctx->state;
+
+	if (request->fl_start < 0 || request->fl_end < 0)
+		return -EINVAL;
+
+	if (IS_GETLK(cmd)) {
+		if (state != NULL)
+			return nfs4_proc_getlk(state, F_GETLK, request);
+		return 0;
+	}
+
+	if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
+		return -EINVAL;
+
+	if (request->fl_type == F_UNLCK) {
+		if (state != NULL)
+			return nfs4_proc_unlck(state, cmd, request);
+		return 0;
+	}
+
+	if (state == NULL)
+		return -ENOLCK;
+	/*
+	 * Don't rely on the VFS having checked the file open mode,
+	 * since it won't do this for flock() locks.
+	 */
+	switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
+	case F_RDLCK:
+		if (!(filp->f_mode & FMODE_READ))
+			return -EBADF;
+		break;
+	case F_WRLCK:
+		if (!(filp->f_mode & FMODE_WRITE))
+			return -EBADF;
+	}
+
+	do {
+		status = nfs4_proc_setlk(state, cmd, request);
+		if ((status != -EAGAIN) || IS_SETLK(cmd))
+			break;
+		timeout = nfs4_set_lock_task_retry(timeout);
+		status = -ERESTARTSYS;
+		if (signalled())
+			break;
+	} while(status < 0);
+	return status;
+}
+
+int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = { };
+	int err;
+
+	err = nfs4_set_lock_state(state, fl);
+	if (err != 0)
+		goto out;
+	do {
+		err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
+		switch (err) {
+			default:
+				printk(KERN_ERR "NFS: %s: unhandled error "
+					"%d.\n", __func__, err);
+			case 0:
+			case -ESTALE:
+				goto out;
+			case -NFS4ERR_EXPIRED:
+				nfs4_schedule_stateid_recovery(server, state);
+			case -NFS4ERR_STALE_CLIENTID:
+			case -NFS4ERR_STALE_STATEID:
+				nfs4_schedule_lease_recovery(server->nfs_client);
+				goto out;
+			case -NFS4ERR_BADSESSION:
+			case -NFS4ERR_BADSLOT:
+			case -NFS4ERR_BAD_HIGH_SLOT:
+			case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+			case -NFS4ERR_DEADSESSION:
+				nfs4_schedule_session_recovery(server->nfs_client->cl_session);
+				goto out;
+			case -ERESTARTSYS:
+				/*
+				 * The show must go on: exit, but mark the
+				 * stateid as needing recovery.
+				 */
+			case -NFS4ERR_DELEG_REVOKED:
+			case -NFS4ERR_ADMIN_REVOKED:
+			case -NFS4ERR_BAD_STATEID:
+			case -NFS4ERR_OPENMODE:
+				nfs4_schedule_stateid_recovery(server, state);
+				err = 0;
+				goto out;
+			case -EKEYEXPIRED:
+				/*
+				 * User RPCSEC_GSS context has expired.
+				 * We cannot recover this stateid now, so
+				 * skip it and allow recovery thread to
+				 * proceed.
+				 */
+				err = 0;
+				goto out;
+			case -ENOMEM:
+			case -NFS4ERR_DENIED:
+				/* kill_proc(fl->fl_pid, SIGLOST, 1); */
+				err = 0;
+				goto out;
+			case -NFS4ERR_DELAY:
+				break;
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+out:
+	return err;
+}
+
+struct nfs_release_lockowner_data {
+	struct nfs4_lock_state *lsp;
+	struct nfs_server *server;
+	struct nfs_release_lockowner_args args;
+};
+
+static void nfs4_release_lockowner_release(void *calldata)
+{
+	struct nfs_release_lockowner_data *data = calldata;
+	nfs4_free_lock_state(data->server, data->lsp);
+	kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs4_release_lockowner_ops = {
+	.rpc_release = nfs4_release_lockowner_release,
+};
+
+int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
+{
+	struct nfs_server *server = lsp->ls_state->owner->so_server;
+	struct nfs_release_lockowner_data *data;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
+	};
+
+	if (server->nfs_client->cl_mvops->minor_version != 0)
+		return -EINVAL;
+	data = kmalloc(sizeof(*data), GFP_NOFS);
+	if (!data)
+		return -ENOMEM;
+	data->lsp = lsp;
+	data->server = server;
+	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
+	data->args.lock_owner.id = lsp->ls_seqid.owner_id;
+	data->args.lock_owner.s_dev = server->s_dev;
+	msg.rpc_argp = &data->args;
+	rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
+	return 0;
+}
+
+#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
+
+static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
+				   const void *buf, size_t buflen,
+				   int flags, int type)
+{
+	if (strcmp(key, "") != 0)
+		return -EINVAL;
+
+	return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
+}
+
+static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
+				   void *buf, size_t buflen, int type)
+{
+	if (strcmp(key, "") != 0)
+		return -EINVAL;
+
+	return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
+}
+
+static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
+				       size_t list_len, const char *name,
+				       size_t name_len, int type)
+{
+	size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
+
+	if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
+		return 0;
+
+	if (list && len <= list_len)
+		memcpy(list, XATTR_NAME_NFSV4_ACL, len);
+	return len;
+}
+
+/*
+ * nfs_fhget will use either the mounted_on_fileid or the fileid
+ */
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
+{
+	if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
+	       (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
+	      (fattr->valid & NFS_ATTR_FATTR_FSID) &&
+	      (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
+		return;
+
+	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
+		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
+	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	fattr->nlink = 2;
+}
+
+static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+				   const struct qstr *name,
+				   struct nfs4_fs_locations *fs_locations,
+				   struct page *page)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	u32 bitmask[2] = {
+		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
+	};
+	struct nfs4_fs_locations_arg args = {
+		.dir_fh = NFS_FH(dir),
+		.name = name,
+		.page = page,
+		.bitmask = bitmask,
+	};
+	struct nfs4_fs_locations_res res = {
+		.fs_locations = fs_locations,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+
+	dprintk("%s: start\n", __func__);
+
+	/* Ask for the fileid of the absent filesystem if mounted_on_fileid
+	 * is not supported */
+	if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
+		bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
+	else
+		bitmask[0] |= FATTR4_WORD0_FILEID;
+
+	nfs_fattr_init(&fs_locations->fattr);
+	fs_locations->server = server;
+	fs_locations->nlocations = 0;
+	status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	dprintk("%s: returned status = %d\n", __func__, status);
+	return status;
+}
+
+int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+			   const struct qstr *name,
+			   struct nfs4_fs_locations *fs_locations,
+			   struct page *page)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				_nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
+{
+	int status;
+	struct nfs4_secinfo_arg args = {
+		.dir_fh = NFS_FH(dir),
+		.name   = name,
+	};
+	struct nfs4_secinfo_res res = {
+		.flavors     = flavors,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	dprintk("NFS call  secinfo %s\n", name->name);
+	status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
+	dprintk("NFS reply  secinfo: %d\n", status);
+	return status;
+}
+
+int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
+		      struct nfs4_secinfo_flavors *flavors)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(dir),
+				_nfs4_proc_secinfo(dir, name, flavors),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+#ifdef CONFIG_NFS_V4_1
+/*
+ * Check the exchange flags returned by the server for invalid flags, having
+ * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
+ * DS flags set.
+ */
+static int nfs4_check_cl_exchange_flags(u32 flags)
+{
+	if (flags & ~EXCHGID4_FLAG_MASK_R)
+		goto out_inval;
+	if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
+	    (flags & EXCHGID4_FLAG_USE_NON_PNFS))
+		goto out_inval;
+	if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
+		goto out_inval;
+	return NFS_OK;
+out_inval:
+	return -NFS4ERR_INVAL;
+}
+
+static bool
+nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
+{
+	if (a->server_scope_sz == b->server_scope_sz &&
+	    memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
+		return true;
+
+	return false;
+}
+
+/*
+ * nfs4_proc_exchange_id()
+ *
+ * Since the clientid has expired, all compounds using sessions
+ * associated with the stale clientid will be returning
+ * NFS4ERR_BADSESSION in the sequence operation, and will therefore
+ * be in some phase of session reset.
+ */
+int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
+{
+	nfs4_verifier verifier;
+	struct nfs41_exchange_id_args args = {
+		.verifier = &verifier,
+		.client = clp,
+		.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
+	};
+	struct nfs41_exchange_id_res res = {
+		.client = clp,
+	};
+	int status;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+
+	dprintk("--> %s\n", __func__);
+	BUG_ON(clp == NULL);
+
+	nfs4_construct_boot_verifier(clp, &verifier);
+
+	args.id_len = scnprintf(args.id, sizeof(args.id),
+				"%s/%s/%u",
+				clp->cl_ipaddr,
+				clp->cl_rpcclient->cl_nodename,
+				clp->cl_rpcclient->cl_auth->au_flavor);
+
+	res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
+	if (unlikely(!res.server_scope)) {
+		status = -ENOMEM;
+		goto out;
+	}
+
+	res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
+	if (unlikely(!res.impl_id)) {
+		status = -ENOMEM;
+		goto out_server_scope;
+	}
+
+	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+	if (!status)
+		status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
+
+	if (!status) {
+		/* use the most recent implementation id */
+		kfree(clp->impl_id);
+		clp->impl_id = res.impl_id;
+	} else
+		kfree(res.impl_id);
+
+	if (!status) {
+		if (clp->server_scope &&
+		    !nfs41_same_server_scope(clp->server_scope,
+					     res.server_scope)) {
+			dprintk("%s: server_scope mismatch detected\n",
+				__func__);
+			set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
+			kfree(clp->server_scope);
+			clp->server_scope = NULL;
+		}
+
+		if (!clp->server_scope) {
+			clp->server_scope = res.server_scope;
+			goto out;
+		}
+	}
+
+out_server_scope:
+	kfree(res.server_scope);
+out:
+	if (clp->impl_id)
+		dprintk("%s: Server Implementation ID: "
+			"domain: %s, name: %s, date: %llu,%u\n",
+			__func__, clp->impl_id->domain, clp->impl_id->name,
+			clp->impl_id->date.seconds,
+			clp->impl_id->date.nseconds);
+	dprintk("<-- %s status= %d\n", __func__, status);
+	return status;
+}
+
+struct nfs4_get_lease_time_data {
+	struct nfs4_get_lease_time_args *args;
+	struct nfs4_get_lease_time_res *res;
+	struct nfs_client *clp;
+};
+
+static void nfs4_get_lease_time_prepare(struct rpc_task *task,
+					void *calldata)
+{
+	int ret;
+	struct nfs4_get_lease_time_data *data =
+			(struct nfs4_get_lease_time_data *)calldata;
+
+	dprintk("--> %s\n", __func__);
+	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+	/* just setup sequence, do not trigger session recovery
+	   since we're invoked within one */
+	ret = nfs41_setup_sequence(data->clp->cl_session,
+				   &data->args->la_seq_args,
+				   &data->res->lr_seq_res, task);
+
+	BUG_ON(ret == -EAGAIN);
+	rpc_call_start(task);
+	dprintk("<-- %s\n", __func__);
+}
+
+/*
+ * Called from nfs4_state_manager thread for session setup, so don't recover
+ * from sequence operation or clientid errors.
+ */
+static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_get_lease_time_data *data =
+			(struct nfs4_get_lease_time_data *)calldata;
+
+	dprintk("--> %s\n", __func__);
+	if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
+		return;
+	switch (task->tk_status) {
+	case -NFS4ERR_DELAY:
+	case -NFS4ERR_GRACE:
+		dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
+		rpc_delay(task, NFS4_POLL_RETRY_MIN);
+		task->tk_status = 0;
+		/* fall through */
+	case -NFS4ERR_RETRY_UNCACHED_REP:
+		rpc_restart_call_prepare(task);
+		return;
+	}
+	dprintk("<-- %s\n", __func__);
+}
+
+static const struct rpc_call_ops nfs4_get_lease_time_ops = {
+	.rpc_call_prepare = nfs4_get_lease_time_prepare,
+	.rpc_call_done = nfs4_get_lease_time_done,
+};
+
+int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
+{
+	struct rpc_task *task;
+	struct nfs4_get_lease_time_args args;
+	struct nfs4_get_lease_time_res res = {
+		.lr_fsinfo = fsinfo,
+	};
+	struct nfs4_get_lease_time_data data = {
+		.args = &args,
+		.res = &res,
+		.clp = clp,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_get_lease_time_ops,
+		.callback_data = &data,
+		.flags = RPC_TASK_TIMEOUT,
+	};
+	int status;
+
+	nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
+	dprintk("--> %s\n", __func__);
+	task = rpc_run_task(&task_setup);
+
+	if (IS_ERR(task))
+		status = PTR_ERR(task);
+	else {
+		status = task->tk_status;
+		rpc_put_task(task);
+	}
+	dprintk("<-- %s return %d\n", __func__, status);
+
+	return status;
+}
+
+static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
+{
+	return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
+}
+
+static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
+		struct nfs4_slot *new,
+		u32 max_slots,
+		u32 ivalue)
+{
+	struct nfs4_slot *old = NULL;
+	u32 i;
+
+	spin_lock(&tbl->slot_tbl_lock);
+	if (new) {
+		old = tbl->slots;
+		tbl->slots = new;
+		tbl->max_slots = max_slots;
+	}
+	tbl->highest_used_slotid = -1;	/* no slot is currently used */
+	for (i = 0; i < tbl->max_slots; i++)
+		tbl->slots[i].seq_nr = ivalue;
+	spin_unlock(&tbl->slot_tbl_lock);
+	kfree(old);
+}
+
+/*
+ * (re)Initialise a slot table
+ */
+static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
+				 u32 ivalue)
+{
+	struct nfs4_slot *new = NULL;
+	int ret = -ENOMEM;
+
+	dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
+		max_reqs, tbl->max_slots);
+
+	/* Does the newly negotiated max_reqs match the existing slot table? */
+	if (max_reqs != tbl->max_slots) {
+		new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
+		if (!new)
+			goto out;
+	}
+	ret = 0;
+
+	nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
+	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
+		tbl, tbl->slots, tbl->max_slots);
+out:
+	dprintk("<-- %s: return %d\n", __func__, ret);
+	return ret;
+}
+
+/* Destroy the slot table */
+static void nfs4_destroy_slot_tables(struct nfs4_session *session)
+{
+	if (session->fc_slot_table.slots != NULL) {
+		kfree(session->fc_slot_table.slots);
+		session->fc_slot_table.slots = NULL;
+	}
+	if (session->bc_slot_table.slots != NULL) {
+		kfree(session->bc_slot_table.slots);
+		session->bc_slot_table.slots = NULL;
+	}
+	return;
+}
+
+/*
+ * Initialize or reset the forechannel and backchannel tables
+ */
+static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
+{
+	struct nfs4_slot_table *tbl;
+	int status;
+
+	dprintk("--> %s\n", __func__);
+	/* Fore channel */
+	tbl = &ses->fc_slot_table;
+	status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
+	if (status) /* -ENOMEM */
+		return status;
+	/* Back channel */
+	tbl = &ses->bc_slot_table;
+	status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
+	if (status && tbl->slots == NULL)
+		/* Fore and back channel share a connection so get
+		 * both slot tables or neither */
+		nfs4_destroy_slot_tables(ses);
+	return status;
+}
+
+struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
+{
+	struct nfs4_session *session;
+	struct nfs4_slot_table *tbl;
+
+	session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
+	if (!session)
+		return NULL;
+
+	tbl = &session->fc_slot_table;
+	tbl->highest_used_slotid = NFS4_NO_SLOT;
+	spin_lock_init(&tbl->slot_tbl_lock);
+	rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
+	init_completion(&tbl->complete);
+
+	tbl = &session->bc_slot_table;
+	tbl->highest_used_slotid = NFS4_NO_SLOT;
+	spin_lock_init(&tbl->slot_tbl_lock);
+	rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
+	init_completion(&tbl->complete);
+
+	session->session_state = 1<<NFS4_SESSION_INITING;
+
+	session->clp = clp;
+	return session;
+}
+
+void nfs4_destroy_session(struct nfs4_session *session)
+{
+	struct rpc_xprt *xprt;
+
+	nfs4_proc_destroy_session(session);
+
+	rcu_read_lock();
+	xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
+	rcu_read_unlock();
+	dprintk("%s Destroy backchannel for xprt %p\n",
+		__func__, xprt);
+	xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
+	nfs4_destroy_slot_tables(session);
+	kfree(session);
+}
+
+/*
+ * Initialize the values to be used by the client in CREATE_SESSION
+ * If nfs4_init_session set the fore channel request and response sizes,
+ * use them.
+ *
+ * Set the back channel max_resp_sz_cached to zero to force the client to
+ * always set csa_cachethis to FALSE because the current implementation
+ * of the back channel DRC only supports caching the CB_SEQUENCE operation.
+ */
+static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
+{
+	struct nfs4_session *session = args->client->cl_session;
+	unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
+		     mxresp_sz = session->fc_attrs.max_resp_sz;
+
+	if (mxrqst_sz == 0)
+		mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
+	if (mxresp_sz == 0)
+		mxresp_sz = NFS_MAX_FILE_IO_SIZE;
+	/* Fore channel attributes */
+	args->fc_attrs.max_rqst_sz = mxrqst_sz;
+	args->fc_attrs.max_resp_sz = mxresp_sz;
+	args->fc_attrs.max_ops = NFS4_MAX_OPS;
+	args->fc_attrs.max_reqs = max_session_slots;
+
+	dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
+		"max_ops=%u max_reqs=%u\n",
+		__func__,
+		args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
+		args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
+
+	/* Back channel attributes */
+	args->bc_attrs.max_rqst_sz = PAGE_SIZE;
+	args->bc_attrs.max_resp_sz = PAGE_SIZE;
+	args->bc_attrs.max_resp_sz_cached = 0;
+	args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
+	args->bc_attrs.max_reqs = 1;
+
+	dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
+		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
+		__func__,
+		args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
+		args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
+		args->bc_attrs.max_reqs);
+}
+
+static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
+{
+	struct nfs4_channel_attrs *sent = &args->fc_attrs;
+	struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
+
+	if (rcvd->max_resp_sz > sent->max_resp_sz)
+		return -EINVAL;
+	/*
+	 * Our requested max_ops is the minimum we need; we're not
+	 * prepared to break up compounds into smaller pieces than that.
+	 * So, no point even trying to continue if the server won't
+	 * cooperate:
+	 */
+	if (rcvd->max_ops < sent->max_ops)
+		return -EINVAL;
+	if (rcvd->max_reqs == 0)
+		return -EINVAL;
+	if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
+		rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
+	return 0;
+}
+
+static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
+{
+	struct nfs4_channel_attrs *sent = &args->bc_attrs;
+	struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
+
+	if (rcvd->max_rqst_sz > sent->max_rqst_sz)
+		return -EINVAL;
+	if (rcvd->max_resp_sz < sent->max_resp_sz)
+		return -EINVAL;
+	if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
+		return -EINVAL;
+	/* These would render the backchannel useless: */
+	if (rcvd->max_ops != sent->max_ops)
+		return -EINVAL;
+	if (rcvd->max_reqs != sent->max_reqs)
+		return -EINVAL;
+	return 0;
+}
+
+static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
+				     struct nfs4_session *session)
+{
+	int ret;
+
+	ret = nfs4_verify_fore_channel_attrs(args, session);
+	if (ret)
+		return ret;
+	return nfs4_verify_back_channel_attrs(args, session);
+}
+
+static int _nfs4_proc_create_session(struct nfs_client *clp)
+{
+	struct nfs4_session *session = clp->cl_session;
+	struct nfs41_create_session_args args = {
+		.client = clp,
+		.cb_program = NFS4_CALLBACK,
+	};
+	struct nfs41_create_session_res res = {
+		.client = clp,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+
+	nfs4_init_channel_attrs(&args);
+	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
+
+	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+
+	if (!status)
+		/* Verify the session's negotiated channel_attrs values */
+		status = nfs4_verify_channel_attrs(&args, session);
+	if (!status) {
+		/* Increment the clientid slot sequence id */
+		clp->cl_seqid++;
+	}
+
+	return status;
+}
+
+/*
+ * Issues a CREATE_SESSION operation to the server.
+ * It is the responsibility of the caller to verify the session is
+ * expired before calling this routine.
+ */
+int nfs4_proc_create_session(struct nfs_client *clp)
+{
+	int status;
+	unsigned *ptr;
+	struct nfs4_session *session = clp->cl_session;
+
+	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
+
+	status = _nfs4_proc_create_session(clp);
+	if (status)
+		goto out;
+
+	/* Init or reset the session slot tables */
+	status = nfs4_setup_session_slot_tables(session);
+	dprintk("slot table setup returned %d\n", status);
+	if (status)
+		goto out;
+
+	ptr = (unsigned *)&session->sess_id.data[0];
+	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
+		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
+out:
+	dprintk("<-- %s\n", __func__);
+	return status;
+}
+
+/*
+ * Issue the over-the-wire RPC DESTROY_SESSION.
+ * The caller must serialize access to this routine.
+ */
+int nfs4_proc_destroy_session(struct nfs4_session *session)
+{
+	int status = 0;
+	struct rpc_message msg;
+
+	dprintk("--> nfs4_proc_destroy_session\n");
+
+	/* session is still being setup */
+	if (session->clp->cl_cons_state != NFS_CS_READY)
+		return status;
+
+	msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
+	msg.rpc_argp = session;
+	msg.rpc_resp = NULL;
+	msg.rpc_cred = NULL;
+	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+
+	if (status)
+		printk(KERN_WARNING
+			"NFS: Got error %d from the server on DESTROY_SESSION. "
+			"Session has been destroyed regardless...\n", status);
+
+	dprintk("<-- nfs4_proc_destroy_session\n");
+	return status;
+}
+
+int nfs4_init_session(struct nfs_server *server)
+{
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs4_session *session;
+	unsigned int rsize, wsize;
+	int ret;
+
+	if (!nfs4_has_session(clp))
+		return 0;
+
+	session = clp->cl_session;
+	if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
+		return 0;
+
+	rsize = server->rsize;
+	if (rsize == 0)
+		rsize = NFS_MAX_FILE_IO_SIZE;
+	wsize = server->wsize;
+	if (wsize == 0)
+		wsize = NFS_MAX_FILE_IO_SIZE;
+
+	session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
+	session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
+
+	ret = nfs4_recover_expired_lease(server);
+	if (!ret)
+		ret = nfs4_check_client_ready(clp);
+	return ret;
+}
+
+int nfs4_init_ds_session(struct nfs_client *clp)
+{
+	struct nfs4_session *session = clp->cl_session;
+	int ret;
+
+	if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
+		return 0;
+
+	ret = nfs4_client_recover_expired_lease(clp);
+	if (!ret)
+		/* Test for the DS role */
+		if (!is_ds_client(clp))
+			ret = -ENODEV;
+	if (!ret)
+		ret = nfs4_check_client_ready(clp);
+	return ret;
+
+}
+EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
+
+
+/*
+ * Renew the cl_session lease.
+ */
+struct nfs4_sequence_data {
+	struct nfs_client *clp;
+	struct nfs4_sequence_args args;
+	struct nfs4_sequence_res res;
+};
+
+static void nfs41_sequence_release(void *data)
+{
+	struct nfs4_sequence_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+
+	if (atomic_read(&clp->cl_count) > 1)
+		nfs4_schedule_state_renewal(clp);
+	nfs_put_client(clp);
+	kfree(calldata);
+}
+
+static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
+{
+	switch(task->tk_status) {
+	case -NFS4ERR_DELAY:
+		rpc_delay(task, NFS4_POLL_RETRY_MAX);
+		return -EAGAIN;
+	default:
+		nfs4_schedule_lease_recovery(clp);
+	}
+	return 0;
+}
+
+static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_sequence_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+
+	if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
+		return;
+
+	if (task->tk_status < 0) {
+		dprintk("%s ERROR %d\n", __func__, task->tk_status);
+		if (atomic_read(&clp->cl_count) == 1)
+			goto out;
+
+		if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
+			rpc_restart_call_prepare(task);
+			return;
+		}
+	}
+	dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
+out:
+	dprintk("<-- %s\n", __func__);
+}
+
+static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_sequence_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+	struct nfs4_sequence_args *args;
+	struct nfs4_sequence_res *res;
+
+	args = task->tk_msg.rpc_argp;
+	res = task->tk_msg.rpc_resp;
+
+	if (nfs41_setup_sequence(clp->cl_session, args, res, task))
+		return;
+	rpc_call_start(task);
+}
+
+static const struct rpc_call_ops nfs41_sequence_ops = {
+	.rpc_call_done = nfs41_sequence_call_done,
+	.rpc_call_prepare = nfs41_sequence_prepare,
+	.rpc_release = nfs41_sequence_release,
+};
+
+static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
+{
+	struct nfs4_sequence_data *calldata;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs41_sequence_ops,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
+	};
+
+	if (!atomic_inc_not_zero(&clp->cl_count))
+		return ERR_PTR(-EIO);
+	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
+	if (calldata == NULL) {
+		nfs_put_client(clp);
+		return ERR_PTR(-ENOMEM);
+	}
+	nfs41_init_sequence(&calldata->args, &calldata->res, 0);
+	msg.rpc_argp = &calldata->args;
+	msg.rpc_resp = &calldata->res;
+	calldata->clp = clp;
+	task_setup_data.callback_data = calldata;
+
+	return rpc_run_task(&task_setup_data);
+}
+
+static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
+{
+	struct rpc_task *task;
+	int ret = 0;
+
+	if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
+		return 0;
+	task = _nfs41_proc_sequence(clp, cred);
+	if (IS_ERR(task))
+		ret = PTR_ERR(task);
+	else
+		rpc_put_task_async(task);
+	dprintk("<-- %s status=%d\n", __func__, ret);
+	return ret;
+}
+
+static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
+{
+	struct rpc_task *task;
+	int ret;
+
+	task = _nfs41_proc_sequence(clp, cred);
+	if (IS_ERR(task)) {
+		ret = PTR_ERR(task);
+		goto out;
+	}
+	ret = rpc_wait_for_completion_task(task);
+	if (!ret) {
+		struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
+
+		if (task->tk_status == 0)
+			nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
+		ret = task->tk_status;
+	}
+	rpc_put_task(task);
+out:
+	dprintk("<-- %s status=%d\n", __func__, ret);
+	return ret;
+}
+
+struct nfs4_reclaim_complete_data {
+	struct nfs_client *clp;
+	struct nfs41_reclaim_complete_args arg;
+	struct nfs41_reclaim_complete_res res;
+};
+
+static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_reclaim_complete_data *calldata = data;
+
+	rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
+	if (nfs41_setup_sequence(calldata->clp->cl_session,
+				&calldata->arg.seq_args,
+				&calldata->res.seq_res, task))
+		return;
+
+	rpc_call_start(task);
+}
+
+static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
+{
+	switch(task->tk_status) {
+	case 0:
+	case -NFS4ERR_COMPLETE_ALREADY:
+	case -NFS4ERR_WRONG_CRED: /* What to do here? */
+		break;
+	case -NFS4ERR_DELAY:
+		rpc_delay(task, NFS4_POLL_RETRY_MAX);
+		/* fall through */
+	case -NFS4ERR_RETRY_UNCACHED_REP:
+		return -EAGAIN;
+	default:
+		nfs4_schedule_lease_recovery(clp);
+	}
+	return 0;
+}
+
+static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_reclaim_complete_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+	struct nfs4_sequence_res *res = &calldata->res.seq_res;
+
+	dprintk("--> %s\n", __func__);
+	if (!nfs41_sequence_done(task, res))
+		return;
+
+	if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return;
+	}
+	dprintk("<-- %s\n", __func__);
+}
+
+static void nfs4_free_reclaim_complete_data(void *data)
+{
+	struct nfs4_reclaim_complete_data *calldata = data;
+
+	kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
+	.rpc_call_prepare = nfs4_reclaim_complete_prepare,
+	.rpc_call_done = nfs4_reclaim_complete_done,
+	.rpc_release = nfs4_free_reclaim_complete_data,
+};
+
+/*
+ * Issue a global reclaim complete.
+ */
+static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
+{
+	struct nfs4_reclaim_complete_data *calldata;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_reclaim_complete_call_ops,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int status = -ENOMEM;
+
+	dprintk("--> %s\n", __func__);
+	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
+	if (calldata == NULL)
+		goto out;
+	calldata->clp = clp;
+	calldata->arg.one_fs = 0;
+
+	nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
+	msg.rpc_argp = &calldata->arg;
+	msg.rpc_resp = &calldata->res;
+	task_setup_data.callback_data = calldata;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task)) {
+		status = PTR_ERR(task);
+		goto out;
+	}
+	status = nfs4_wait_for_completion_rpc_task(task);
+	if (status == 0)
+		status = task->tk_status;
+	rpc_put_task(task);
+	return 0;
+out:
+	dprintk("<-- %s status=%d\n", __func__, status);
+	return status;
+}
+
+static void
+nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutget *lgp = calldata;
+	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+
+	dprintk("--> %s\n", __func__);
+	/* Note the is a race here, where a CB_LAYOUTRECALL can come in
+	 * right now covering the LAYOUTGET we are about to send.
+	 * However, that is not so catastrophic, and there seems
+	 * to be no way to prevent it completely.
+	 */
+	if (nfs4_setup_sequence(server, &lgp->args.seq_args,
+				&lgp->res.seq_res, task))
+		return;
+	if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
+					  NFS_I(lgp->args.inode)->layout,
+					  lgp->args.ctx->state)) {
+		rpc_exit(task, NFS4_OK);
+		return;
+	}
+	rpc_call_start(task);
+}
+
+static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutget *lgp = calldata;
+	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+
+	dprintk("--> %s\n", __func__);
+
+	if (!nfs4_sequence_done(task, &lgp->res.seq_res))
+		return;
+
+	switch (task->tk_status) {
+	case 0:
+		break;
+	case -NFS4ERR_LAYOUTTRYLATER:
+	case -NFS4ERR_RECALLCONFLICT:
+		task->tk_status = -NFS4ERR_DELAY;
+		/* Fall through */
+	default:
+		if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
+			rpc_restart_call_prepare(task);
+			return;
+		}
+	}
+	dprintk("<-- %s\n", __func__);
+}
+
+static void nfs4_layoutget_release(void *calldata)
+{
+	struct nfs4_layoutget *lgp = calldata;
+
+	dprintk("--> %s\n", __func__);
+	put_nfs_open_context(lgp->args.ctx);
+	kfree(calldata);
+	dprintk("<-- %s\n", __func__);
+}
+
+static const struct rpc_call_ops nfs4_layoutget_call_ops = {
+	.rpc_call_prepare = nfs4_layoutget_prepare,
+	.rpc_call_done = nfs4_layoutget_done,
+	.rpc_release = nfs4_layoutget_release,
+};
+
+int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
+{
+	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
+		.rpc_argp = &lgp->args,
+		.rpc_resp = &lgp->res,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_layoutget_call_ops,
+		.callback_data = lgp,
+		.flags = RPC_TASK_ASYNC,
+	};
+	int status = 0;
+
+	dprintk("--> %s\n", __func__);
+
+	lgp->res.layoutp = &lgp->args.layout;
+	lgp->res.seq_res.sr_slot = NULL;
+	nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = nfs4_wait_for_completion_rpc_task(task);
+	if (status == 0)
+		status = task->tk_status;
+	if (status == 0)
+		status = pnfs_layout_process(lgp);
+	rpc_put_task(task);
+	dprintk("<-- %s status=%d\n", __func__, status);
+	return status;
+}
+
+static void
+nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutreturn *lrp = calldata;
+
+	dprintk("--> %s\n", __func__);
+	if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
+				&lrp->res.seq_res, task))
+		return;
+	rpc_call_start(task);
+}
+
+static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutreturn *lrp = calldata;
+	struct nfs_server *server;
+	struct pnfs_layout_hdr *lo = lrp->args.layout;
+
+	dprintk("--> %s\n", __func__);
+
+	if (!nfs4_sequence_done(task, &lrp->res.seq_res))
+		return;
+
+	server = NFS_SERVER(lrp->args.inode);
+	if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return;
+	}
+	spin_lock(&lo->plh_inode->i_lock);
+	if (task->tk_status == 0) {
+		if (lrp->res.lrs_present) {
+			pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
+		} else
+			BUG_ON(!list_empty(&lo->plh_segs));
+	}
+	lo->plh_block_lgets--;
+	spin_unlock(&lo->plh_inode->i_lock);
+	dprintk("<-- %s\n", __func__);
+}
+
+static void nfs4_layoutreturn_release(void *calldata)
+{
+	struct nfs4_layoutreturn *lrp = calldata;
+
+	dprintk("--> %s\n", __func__);
+	put_layout_hdr(lrp->args.layout);
+	kfree(calldata);
+	dprintk("<-- %s\n", __func__);
+}
+
+static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
+	.rpc_call_prepare = nfs4_layoutreturn_prepare,
+	.rpc_call_done = nfs4_layoutreturn_done,
+	.rpc_release = nfs4_layoutreturn_release,
+};
+
+int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
+{
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
+		.rpc_argp = &lrp->args,
+		.rpc_resp = &lrp->res,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = lrp->clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_layoutreturn_call_ops,
+		.callback_data = lrp,
+	};
+	int status;
+
+	dprintk("--> %s\n", __func__);
+	nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = task->tk_status;
+	dprintk("<-- %s status=%d\n", __func__, status);
+	rpc_put_task(task);
+	return status;
+}
+
+/*
+ * Retrieve the list of Data Server devices from the MDS.
+ */
+static int _nfs4_getdevicelist(struct nfs_server *server,
+				    const struct nfs_fh *fh,
+				    struct pnfs_devicelist *devlist)
+{
+	struct nfs4_getdevicelist_args args = {
+		.fh = fh,
+		.layoutclass = server->pnfs_curr_ld->id,
+	};
+	struct nfs4_getdevicelist_res res = {
+		.devlist = devlist,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+
+	dprintk("--> %s\n", __func__);
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
+				&res.seq_res, 0);
+	dprintk("<-- %s status=%d\n", __func__, status);
+	return status;
+}
+
+int nfs4_proc_getdevicelist(struct nfs_server *server,
+			    const struct nfs_fh *fh,
+			    struct pnfs_devicelist *devlist)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_getdevicelist(server, fh, devlist),
+				&exception);
+	} while (exception.retry);
+
+	dprintk("%s: err=%d, num_devs=%u\n", __func__,
+		err, devlist->num_devs);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
+
+static int
+_nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
+{
+	struct nfs4_getdeviceinfo_args args = {
+		.pdev = pdev,
+	};
+	struct nfs4_getdeviceinfo_res res = {
+		.pdev = pdev,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+
+	dprintk("--> %s\n", __func__);
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	dprintk("<-- %s status=%d\n", __func__, status);
+
+	return status;
+}
+
+int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = nfs4_handle_exception(server,
+					_nfs4_proc_getdeviceinfo(server, pdev),
+					&exception);
+	} while (exception.retry);
+	return err;
+}
+EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
+
+static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutcommit_data *data = calldata;
+	struct nfs_server *server = NFS_SERVER(data->args.inode);
+
+	if (nfs4_setup_sequence(server, &data->args.seq_args,
+				&data->res.seq_res, task))
+		return;
+	rpc_call_start(task);
+}
+
+static void
+nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutcommit_data *data = calldata;
+	struct nfs_server *server = NFS_SERVER(data->args.inode);
+
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return;
+
+	switch (task->tk_status) { /* Just ignore these failures */
+	case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
+	case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
+	case -NFS4ERR_BADLAYOUT:     /* no layout */
+	case -NFS4ERR_GRACE:	    /* loca_recalim always false */
+		task->tk_status = 0;
+		break;
+	case 0:
+		nfs_post_op_update_inode_force_wcc(data->args.inode,
+						   data->res.fattr);
+		break;
+	default:
+		if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
+			rpc_restart_call_prepare(task);
+			return;
+		}
+	}
+}
+
+static void nfs4_layoutcommit_release(void *calldata)
+{
+	struct nfs4_layoutcommit_data *data = calldata;
+	struct pnfs_layout_segment *lseg, *tmp;
+	unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
+
+	pnfs_cleanup_layoutcommit(data);
+	/* Matched by references in pnfs_set_layoutcommit */
+	list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
+		list_del_init(&lseg->pls_lc_list);
+		if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
+				       &lseg->pls_flags))
+			put_lseg(lseg);
+	}
+
+	clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
+	smp_mb__after_clear_bit();
+	wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
+
+	put_rpccred(data->cred);
+	kfree(data);
+}
+
+static const struct rpc_call_ops nfs4_layoutcommit_ops = {
+	.rpc_call_prepare = nfs4_layoutcommit_prepare,
+	.rpc_call_done = nfs4_layoutcommit_done,
+	.rpc_release = nfs4_layoutcommit_release,
+};
+
+int
+nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
+		.rpc_argp = &data->args,
+		.rpc_resp = &data->res,
+		.rpc_cred = data->cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.task = &data->task,
+		.rpc_client = NFS_CLIENT(data->args.inode),
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_layoutcommit_ops,
+		.callback_data = data,
+		.flags = RPC_TASK_ASYNC,
+	};
+	struct rpc_task *task;
+	int status = 0;
+
+	dprintk("NFS: %4d initiating layoutcommit call. sync %d "
+		"lbw: %llu inode %lu\n",
+		data->task.tk_pid, sync,
+		data->args.lastbytewritten,
+		data->args.inode->i_ino);
+
+	nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	if (sync == false)
+		goto out;
+	status = nfs4_wait_for_completion_rpc_task(task);
+	if (status != 0)
+		goto out;
+	status = task->tk_status;
+out:
+	dprintk("%s: status %d\n", __func__, status);
+	rpc_put_task(task);
+	return status;
+}
+
+static int
+_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
+		    struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
+{
+	struct nfs41_secinfo_no_name_args args = {
+		.style = SECINFO_STYLE_CURRENT_FH,
+	};
+	struct nfs4_secinfo_res res = {
+		.flavors = flavors,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int
+nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
+			   struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
+		switch (err) {
+		case 0:
+		case -NFS4ERR_WRONGSEC:
+		case -NFS4ERR_NOTSUPP:
+			goto out;
+		default:
+			err = nfs4_handle_exception(server, err, &exception);
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int
+nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
+		    struct nfs_fsinfo *info)
+{
+	int err;
+	struct page *page;
+	rpc_authflavor_t flavor;
+	struct nfs4_secinfo_flavors *flavors;
+
+	page = alloc_page(GFP_KERNEL);
+	if (!page) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	flavors = page_address(page);
+	err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
+
+	/*
+	 * Fall back on "guess and check" method if
+	 * the server doesn't support SECINFO_NO_NAME
+	 */
+	if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
+		err = nfs4_find_root_sec(server, fhandle, info);
+		goto out_freepage;
+	}
+	if (err)
+		goto out_freepage;
+
+	flavor = nfs_find_best_sec(flavors);
+	if (err == 0)
+		err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
+
+out_freepage:
+	put_page(page);
+	if (err == -EACCES)
+		return -EPERM;
+out:
+	return err;
+}
+
+static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
+{
+	int status;
+	struct nfs41_test_stateid_args args = {
+		.stateid = stateid,
+	};
+	struct nfs41_test_stateid_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
+	status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
+
+	if (status == NFS_OK)
+		return res.status;
+	return status;
+}
+
+static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs41_test_stateid(server, stateid),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
+{
+	struct nfs41_free_stateid_args args = {
+		.stateid = stateid,
+	};
+	struct nfs41_free_stateid_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
+	return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
+}
+
+static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_free_stateid(server, stateid),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static bool nfs41_match_stateid(const nfs4_stateid *s1,
+		const nfs4_stateid *s2)
+{
+	if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
+		return false;
+
+	if (s1->seqid == s2->seqid)
+		return true;
+	if (s1->seqid == 0 || s2->seqid == 0)
+		return true;
+
+	return false;
+}
+
+#endif /* CONFIG_NFS_V4_1 */
+
+static bool nfs4_match_stateid(const nfs4_stateid *s1,
+		const nfs4_stateid *s2)
+{
+	return nfs4_stateid_match(s1, s2);
+}
+
+
+static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
+	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
+	.recover_open	= nfs4_open_reclaim,
+	.recover_lock	= nfs4_lock_reclaim,
+	.establish_clid = nfs4_init_clientid,
+	.get_clid_cred	= nfs4_get_setclientid_cred,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
+	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
+	.recover_open	= nfs4_open_reclaim,
+	.recover_lock	= nfs4_lock_reclaim,
+	.establish_clid = nfs41_init_clientid,
+	.get_clid_cred	= nfs4_get_exchange_id_cred,
+	.reclaim_complete = nfs41_proc_reclaim_complete,
+};
+#endif /* CONFIG_NFS_V4_1 */
+
+static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
+	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
+	.recover_open	= nfs4_open_expired,
+	.recover_lock	= nfs4_lock_expired,
+	.establish_clid = nfs4_init_clientid,
+	.get_clid_cred	= nfs4_get_setclientid_cred,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
+	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
+	.recover_open	= nfs41_open_expired,
+	.recover_lock	= nfs41_lock_expired,
+	.establish_clid = nfs41_init_clientid,
+	.get_clid_cred	= nfs4_get_exchange_id_cred,
+};
+#endif /* CONFIG_NFS_V4_1 */
+
+static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
+	.sched_state_renewal = nfs4_proc_async_renew,
+	.get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
+	.renew_lease = nfs4_proc_renew,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
+	.sched_state_renewal = nfs41_proc_async_sequence,
+	.get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
+	.renew_lease = nfs4_proc_sequence,
+};
+#endif
+
+static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
+	.minor_version = 0,
+	.call_sync = _nfs4_call_sync,
+	.match_stateid = nfs4_match_stateid,
+	.find_root_sec = nfs4_find_root_sec,
+	.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
+	.nograce_recovery_ops = &nfs40_nograce_recovery_ops,
+	.state_renewal_ops = &nfs40_state_renewal_ops,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
+	.minor_version = 1,
+	.call_sync = _nfs4_call_sync_session,
+	.match_stateid = nfs41_match_stateid,
+	.find_root_sec = nfs41_find_root_sec,
+	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
+	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
+	.state_renewal_ops = &nfs41_state_renewal_ops,
+};
+#endif
+
+const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
+	[0] = &nfs_v4_0_minor_ops,
+#if defined(CONFIG_NFS_V4_1)
+	[1] = &nfs_v4_1_minor_ops,
+#endif
+};
+
+static const struct inode_operations nfs4_file_inode_operations = {
+	.permission	= nfs_permission,
+	.getattr	= nfs_getattr,
+	.setattr	= nfs_setattr,
+	.getxattr	= generic_getxattr,
+	.setxattr	= generic_setxattr,
+	.listxattr	= generic_listxattr,
+	.removexattr	= generic_removexattr,
+};
+
+const struct nfs_rpc_ops nfs_v4_clientops = {
+	.version	= 4,			/* protocol version */
+	.dentry_ops	= &nfs4_dentry_operations,
+	.dir_inode_ops	= &nfs4_dir_inode_operations,
+	.file_inode_ops	= &nfs4_file_inode_operations,
+	.file_ops	= &nfs4_file_operations,
+	.getroot	= nfs4_proc_get_root,
+	.getattr	= nfs4_proc_getattr,
+	.setattr	= nfs4_proc_setattr,
+	.lookup		= nfs4_proc_lookup,
+	.access		= nfs4_proc_access,
+	.readlink	= nfs4_proc_readlink,
+	.create		= nfs4_proc_create,
+	.remove		= nfs4_proc_remove,
+	.unlink_setup	= nfs4_proc_unlink_setup,
+	.unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
+	.unlink_done	= nfs4_proc_unlink_done,
+	.rename		= nfs4_proc_rename,
+	.rename_setup	= nfs4_proc_rename_setup,
+	.rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
+	.rename_done	= nfs4_proc_rename_done,
+	.link		= nfs4_proc_link,
+	.symlink	= nfs4_proc_symlink,
+	.mkdir		= nfs4_proc_mkdir,
+	.rmdir		= nfs4_proc_remove,
+	.readdir	= nfs4_proc_readdir,
+	.mknod		= nfs4_proc_mknod,
+	.statfs		= nfs4_proc_statfs,
+	.fsinfo		= nfs4_proc_fsinfo,
+	.pathconf	= nfs4_proc_pathconf,
+	.set_capabilities = nfs4_server_capabilities,
+	.decode_dirent	= nfs4_decode_dirent,
+	.read_setup	= nfs4_proc_read_setup,
+	.read_rpc_prepare = nfs4_proc_read_rpc_prepare,
+	.read_done	= nfs4_read_done,
+	.write_setup	= nfs4_proc_write_setup,
+	.write_rpc_prepare = nfs4_proc_write_rpc_prepare,
+	.write_done	= nfs4_write_done,
+	.commit_setup	= nfs4_proc_commit_setup,
+	.commit_done	= nfs4_commit_done,
+	.lock		= nfs4_proc_lock,
+	.clear_acl_cache = nfs4_zap_acl_attr,
+	.close_context  = nfs4_close_context,
+	.open_context	= nfs4_atomic_open,
+	.init_client	= nfs4_init_client,
+	.secinfo	= nfs4_proc_secinfo,
+};
+
+static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
+	.prefix	= XATTR_NAME_NFSV4_ACL,
+	.list	= nfs4_xattr_list_nfs4_acl,
+	.get	= nfs4_xattr_get_nfs4_acl,
+	.set	= nfs4_xattr_set_nfs4_acl,
+};
+
+const struct xattr_handler *nfs4_xattr_handlers[] = {
+	&nfs4_xattr_nfs4_acl_handler,
+	NULL
+};
+
+module_param(max_session_slots, ushort, 0644);
+MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
+		"requests the client will negotiate");
+
+/*
+ * Local variables:
+ *  c-basic-offset: 8
+ * End:
+ */