Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3320 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
new file mode 100644
index 000000000000..579f7fea7968
--- /dev/null
+++ b/fs/nfsd/nfs4state.c
@@ -0,0 +1,3320 @@
+/*
+*  linux/fs/nfsd/nfs4state.c
+*
+*  Copyright (c) 2001 The Regents of the University of Michigan.
+*  All rights reserved.
+*
+*  Kendrick Smith <kmsmith@umich.edu>
+*  Andy Adamson <kandros@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/param.h>
+#include <linux/major.h>
+#include <linux/slab.h>
+
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#include <linux/nfsd/cache.h>
+#include <linux/mount.h>
+#include <linux/workqueue.h>
+#include <linux/smp_lock.h>
+#include <linux/kthread.h>
+#include <linux/nfs4.h>
+#include <linux/nfsd/state.h>
+#include <linux/nfsd/xdr4.h>
+
+#define NFSDDBG_FACILITY                NFSDDBG_PROC
+
+/* Globals */
+static time_t lease_time = 90;     /* default lease time */
+static time_t old_lease_time = 90; /* past incarnation lease time */
+static u32 nfs4_reclaim_init = 0;
+time_t boot_time;
+static time_t grace_end = 0;
+static u32 current_clientid = 1;
+static u32 current_ownerid = 1;
+static u32 current_fileid = 1;
+static u32 current_delegid = 1;
+static u32 nfs4_init;
+stateid_t zerostateid;             /* bits all 0 */
+stateid_t onestateid;              /* bits all 1 */
+
+/* debug counters */
+u32 list_add_perfile = 0; 
+u32 list_del_perfile = 0;
+u32 add_perclient = 0;
+u32 del_perclient = 0;
+u32 alloc_file = 0;
+u32 free_file = 0;
+u32 vfsopen = 0;
+u32 vfsclose = 0;
+u32 alloc_delegation= 0;
+u32 free_delegation= 0;
+
+/* forward declarations */
+struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
+static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
+static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
+
+/* Locking:
+ *
+ * client_sema: 
+ * 	protects clientid_hashtbl[], clientstr_hashtbl[],
+ * 	unconfstr_hashtbl[], uncofid_hashtbl[].
+ */
+static DECLARE_MUTEX(client_sema);
+
+void
+nfs4_lock_state(void)
+{
+	down(&client_sema);
+}
+
+void
+nfs4_unlock_state(void)
+{
+	up(&client_sema);
+}
+
+static inline u32
+opaque_hashval(const void *ptr, int nbytes)
+{
+	unsigned char *cptr = (unsigned char *) ptr;
+
+	u32 x = 0;
+	while (nbytes--) {
+		x *= 37;
+		x += *cptr++;
+	}
+	return x;
+}
+
+/* forward declarations */
+static void release_stateowner(struct nfs4_stateowner *sop);
+static void release_stateid(struct nfs4_stateid *stp, int flags);
+static void release_file(struct nfs4_file *fp);
+
+/*
+ * Delegation state
+ */
+
+/* recall_lock protects the del_recall_lru */
+spinlock_t recall_lock;
+static struct list_head del_recall_lru;
+
+static struct nfs4_delegation *
+alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
+{
+	struct nfs4_delegation *dp;
+	struct nfs4_file *fp = stp->st_file;
+	struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
+
+	dprintk("NFSD alloc_init_deleg\n");
+	if ((dp = kmalloc(sizeof(struct nfs4_delegation),
+		GFP_KERNEL)) == NULL)
+		return dp;
+	INIT_LIST_HEAD(&dp->dl_del_perfile);
+	INIT_LIST_HEAD(&dp->dl_del_perclnt);
+	INIT_LIST_HEAD(&dp->dl_recall_lru);
+	dp->dl_client = clp;
+	dp->dl_file = fp;
+	dp->dl_flock = NULL;
+	get_file(stp->st_vfs_file);
+	dp->dl_vfs_file = stp->st_vfs_file;
+	dp->dl_type = type;
+	dp->dl_recall.cbr_dp = NULL;
+	dp->dl_recall.cbr_ident = cb->cb_ident;
+	dp->dl_recall.cbr_trunc = 0;
+	dp->dl_stateid.si_boot = boot_time;
+	dp->dl_stateid.si_stateownerid = current_delegid++;
+	dp->dl_stateid.si_fileid = 0;
+	dp->dl_stateid.si_generation = 0;
+	dp->dl_fhlen = current_fh->fh_handle.fh_size;
+	memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
+		        current_fh->fh_handle.fh_size);
+	dp->dl_time = 0;
+	atomic_set(&dp->dl_count, 1);
+	list_add(&dp->dl_del_perfile, &fp->fi_del_perfile);
+	list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
+	alloc_delegation++;
+	return dp;
+}
+
+void
+nfs4_put_delegation(struct nfs4_delegation *dp)
+{
+	if (atomic_dec_and_test(&dp->dl_count)) {
+		dprintk("NFSD: freeing dp %p\n",dp);
+		kfree(dp);
+		free_delegation++;
+	}
+}
+
+/* Remove the associated file_lock first, then remove the delegation.
+ * lease_modify() is called to remove the FS_LEASE file_lock from
+ * the i_flock list, eventually calling nfsd's lock_manager
+ * fl_release_callback.
+ */
+static void
+nfs4_close_delegation(struct nfs4_delegation *dp)
+{
+	struct file *filp = dp->dl_vfs_file;
+
+	dprintk("NFSD: close_delegation dp %p\n",dp);
+	dp->dl_vfs_file = NULL;
+	/* The following nfsd_close may not actually close the file,
+	 * but we want to remove the lease in any case. */
+	setlease(filp, F_UNLCK, &dp->dl_flock);
+	nfsd_close(filp);
+	vfsclose++;
+}
+
+/* Called under the state lock. */
+static void
+unhash_delegation(struct nfs4_delegation *dp)
+{
+	list_del_init(&dp->dl_del_perfile);
+	list_del_init(&dp->dl_del_perclnt);
+	spin_lock(&recall_lock);
+	list_del_init(&dp->dl_recall_lru);
+	spin_unlock(&recall_lock);
+	nfs4_close_delegation(dp);
+	nfs4_put_delegation(dp);
+}
+
+/* 
+ * SETCLIENTID state 
+ */
+
+/* Hash tables for nfs4_clientid state */
+#define CLIENT_HASH_BITS                 4
+#define CLIENT_HASH_SIZE                (1 << CLIENT_HASH_BITS)
+#define CLIENT_HASH_MASK                (CLIENT_HASH_SIZE - 1)
+
+#define clientid_hashval(id) \
+	((id) & CLIENT_HASH_MASK)
+#define clientstr_hashval(name, namelen) \
+	(opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
+/*
+ * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
+ * used in reboot/reset lease grace period processing
+ *
+ * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
+ * setclientid_confirmed info. 
+ *
+ * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed 
+ * setclientid info.
+ *
+ * client_lru holds client queue ordered by nfs4_client.cl_time
+ * for lease renewal.
+ *
+ * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
+ * for last close replay.
+ */
+static struct list_head	reclaim_str_hashtbl[CLIENT_HASH_SIZE];
+static int reclaim_str_hashtbl_size = 0;
+static struct list_head	conf_id_hashtbl[CLIENT_HASH_SIZE];
+static struct list_head	conf_str_hashtbl[CLIENT_HASH_SIZE];
+static struct list_head	unconf_str_hashtbl[CLIENT_HASH_SIZE];
+static struct list_head	unconf_id_hashtbl[CLIENT_HASH_SIZE];
+static struct list_head client_lru;
+static struct list_head close_lru;
+
+static inline void
+renew_client(struct nfs4_client *clp)
+{
+	/*
+	* Move client to the end to the LRU list.
+	*/
+	dprintk("renewing client (clientid %08x/%08x)\n", 
+			clp->cl_clientid.cl_boot, 
+			clp->cl_clientid.cl_id);
+	list_move_tail(&clp->cl_lru, &client_lru);
+	clp->cl_time = get_seconds();
+}
+
+/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
+static int
+STALE_CLIENTID(clientid_t *clid)
+{
+	if (clid->cl_boot == boot_time)
+		return 0;
+	dprintk("NFSD stale clientid (%08x/%08x)\n", 
+			clid->cl_boot, clid->cl_id);
+	return 1;
+}
+
+/* 
+ * XXX Should we use a slab cache ?
+ * This type of memory management is somewhat inefficient, but we use it
+ * anyway since SETCLIENTID is not a common operation.
+ */
+static inline struct nfs4_client *
+alloc_client(struct xdr_netobj name)
+{
+	struct nfs4_client *clp;
+
+	if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
+		memset(clp, 0, sizeof(*clp));
+		if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
+			memcpy(clp->cl_name.data, name.data, name.len);
+			clp->cl_name.len = name.len;
+		}
+		else {
+			kfree(clp);
+			clp = NULL;
+		}
+	}
+	return clp;
+}
+
+static inline void
+free_client(struct nfs4_client *clp)
+{
+	if (clp->cl_cred.cr_group_info)
+		put_group_info(clp->cl_cred.cr_group_info);
+	kfree(clp->cl_name.data);
+	kfree(clp);
+}
+
+void
+put_nfs4_client(struct nfs4_client *clp)
+{
+	if (atomic_dec_and_test(&clp->cl_count))
+		free_client(clp);
+}
+
+static void
+expire_client(struct nfs4_client *clp)
+{
+	struct nfs4_stateowner *sop;
+	struct nfs4_delegation *dp;
+	struct nfs4_callback *cb = &clp->cl_callback;
+	struct rpc_clnt *clnt = clp->cl_callback.cb_client;
+	struct list_head reaplist;
+
+	dprintk("NFSD: expire_client cl_count %d\n",
+	                    atomic_read(&clp->cl_count));
+
+	/* shutdown rpc client, ending any outstanding recall rpcs */
+	if (atomic_read(&cb->cb_set) == 1 && clnt) {
+		rpc_shutdown_client(clnt);
+		clnt = clp->cl_callback.cb_client = NULL;
+	}
+
+	INIT_LIST_HEAD(&reaplist);
+	spin_lock(&recall_lock);
+	while (!list_empty(&clp->cl_del_perclnt)) {
+		dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
+		dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
+				dp->dl_flock);
+		list_del_init(&dp->dl_del_perclnt);
+		list_move(&dp->dl_recall_lru, &reaplist);
+	}
+	spin_unlock(&recall_lock);
+	while (!list_empty(&reaplist)) {
+		dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
+		list_del_init(&dp->dl_recall_lru);
+		unhash_delegation(dp);
+	}
+	list_del(&clp->cl_idhash);
+	list_del(&clp->cl_strhash);
+	list_del(&clp->cl_lru);
+	while (!list_empty(&clp->cl_perclient)) {
+		sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
+		release_stateowner(sop);
+	}
+	put_nfs4_client(clp);
+}
+
+static struct nfs4_client *
+create_client(struct xdr_netobj name) {
+	struct nfs4_client *clp;
+
+	if (!(clp = alloc_client(name)))
+		goto out;
+	atomic_set(&clp->cl_count, 1);
+	atomic_set(&clp->cl_callback.cb_set, 0);
+	clp->cl_callback.cb_parsed = 0;
+	INIT_LIST_HEAD(&clp->cl_idhash);
+	INIT_LIST_HEAD(&clp->cl_strhash);
+	INIT_LIST_HEAD(&clp->cl_perclient);
+	INIT_LIST_HEAD(&clp->cl_del_perclnt);
+	INIT_LIST_HEAD(&clp->cl_lru);
+out:
+	return clp;
+}
+
+static void
+copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
+	memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
+}
+
+static void
+copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
+	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; 
+	target->cl_clientid.cl_id = source->cl_clientid.cl_id; 
+}
+
+static void
+copy_cred(struct svc_cred *target, struct svc_cred *source) {
+
+	target->cr_uid = source->cr_uid;
+	target->cr_gid = source->cr_gid;
+	target->cr_group_info = source->cr_group_info;
+	get_group_info(target->cr_group_info);
+}
+
+static int
+cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
+	if (!n1 || !n2)
+		return 0;
+	return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
+}
+
+static int
+cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
+	return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
+}
+
+static int
+cmp_clid(clientid_t * cl1, clientid_t * cl2) {
+	return((cl1->cl_boot == cl2->cl_boot) &&
+	   	(cl1->cl_id == cl2->cl_id));
+}
+
+/* XXX what about NGROUP */
+static int
+cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
+	return(cr1->cr_uid == cr2->cr_uid);
+
+}
+
+static void
+gen_clid(struct nfs4_client *clp) {
+	clp->cl_clientid.cl_boot = boot_time;
+	clp->cl_clientid.cl_id = current_clientid++; 
+}
+
+static void
+gen_confirm(struct nfs4_client *clp) {
+	struct timespec 	tv;
+	u32 *			p;
+
+	tv = CURRENT_TIME;
+	p = (u32 *)clp->cl_confirm.data;
+	*p++ = tv.tv_sec;
+	*p++ = tv.tv_nsec;
+}
+
+static int
+check_name(struct xdr_netobj name) {
+
+	if (name.len == 0) 
+		return 0;
+	if (name.len > NFS4_OPAQUE_LIMIT) {
+		printk("NFSD: check_name: name too long(%d)!\n", name.len);
+		return 0;
+	}
+	return 1;
+}
+
+void
+add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
+{
+	unsigned int idhashval;
+
+	list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
+	idhashval = clientid_hashval(clp->cl_clientid.cl_id);
+	list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
+	list_add_tail(&clp->cl_lru, &client_lru);
+	clp->cl_time = get_seconds();
+}
+
+void
+move_to_confirmed(struct nfs4_client *clp)
+{
+	unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
+	unsigned int strhashval;
+
+	dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
+	list_del_init(&clp->cl_strhash);
+	list_del_init(&clp->cl_idhash);
+	list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
+	strhashval = clientstr_hashval(clp->cl_name.data, 
+			clp->cl_name.len);
+	list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
+	renew_client(clp);
+}
+
+static struct nfs4_client *
+find_confirmed_client(clientid_t *clid)
+{
+	struct nfs4_client *clp;
+	unsigned int idhashval = clientid_hashval(clid->cl_id);
+
+	list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
+		if (cmp_clid(&clp->cl_clientid, clid))
+			return clp;
+	}
+	return NULL;
+}
+
+static struct nfs4_client *
+find_unconfirmed_client(clientid_t *clid)
+{
+	struct nfs4_client *clp;
+	unsigned int idhashval = clientid_hashval(clid->cl_id);
+
+	list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
+		if (cmp_clid(&clp->cl_clientid, clid))
+			return clp;
+	}
+	return NULL;
+}
+
+/* a helper function for parse_callback */
+static int
+parse_octet(unsigned int *lenp, char **addrp)
+{
+	unsigned int len = *lenp;
+	char *p = *addrp;
+	int n = -1;
+	char c;
+
+	for (;;) {
+		if (!len)
+			break;
+		len--;
+		c = *p++;
+		if (c == '.')
+			break;
+		if ((c < '0') || (c > '9')) {
+			n = -1;
+			break;
+		}
+		if (n < 0)
+			n = 0;
+		n = (n * 10) + (c - '0');
+		if (n > 255) {
+			n = -1;
+			break;
+		}
+	}
+	*lenp = len;
+	*addrp = p;
+	return n;
+}
+
+/* parse and set the setclientid ipv4 callback address */
+int
+parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
+{
+	int temp = 0;
+	u32 cbaddr = 0;
+	u16 cbport = 0;
+	u32 addrlen = addr_len;
+	char *addr = addr_val;
+	int i, shift;
+
+	/* ipaddress */
+	shift = 24;
+	for(i = 4; i > 0  ; i--) {
+		if ((temp = parse_octet(&addrlen, &addr)) < 0) {
+			return 0;
+		}
+		cbaddr |= (temp << shift);
+		if (shift > 0)
+		shift -= 8;
+	}
+	*cbaddrp = cbaddr;
+
+	/* port */
+	shift = 8;
+	for(i = 2; i > 0  ; i--) {
+		if ((temp = parse_octet(&addrlen, &addr)) < 0) {
+			return 0;
+		}
+		cbport |= (temp << shift);
+		if (shift > 0)
+			shift -= 8;
+	}
+	*cbportp = cbport;
+	return 1;
+}
+
+void
+gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
+{
+	struct nfs4_callback *cb = &clp->cl_callback;
+
+	/* Currently, we only support tcp for the callback channel */
+	if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
+		goto out_err;
+
+	if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
+	                 &cb->cb_addr, &cb->cb_port)))
+		goto out_err;
+	cb->cb_prog = se->se_callback_prog;
+	cb->cb_ident = se->se_callback_ident;
+	cb->cb_parsed = 1;
+	return;
+out_err:
+	printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
+		"will not receive delegations\n",
+		clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+
+	cb->cb_parsed = 0;
+	return;
+}
+
+/*
+ * RFC 3010 has a complex implmentation description of processing a 
+ * SETCLIENTID request consisting of 5 bullets, labeled as 
+ * CASE0 - CASE4 below.
+ *
+ * NOTES:
+ * 	callback information will be processed in a future patch
+ *
+ *	an unconfirmed record is added when:
+ *      NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
+ *	CASE 1: confirmed record found with matching name, principal,
+ *		verifier, and clientid.
+ *	CASE 2: confirmed record found with matching name, principal,
+ *		and there is no unconfirmed record with matching
+ *		name and principal
+ *
+ *      an unconfirmed record is replaced when:
+ *	CASE 3: confirmed record found with matching name, principal,
+ *		and an unconfirmed record is found with matching 
+ *		name, principal, and with clientid and
+ *		confirm that does not match the confirmed record.
+ *	CASE 4: there is no confirmed record with matching name and 
+ *		principal. there is an unconfirmed record with 
+ *		matching name, principal.
+ *
+ *	an unconfirmed record is deleted when:
+ *	CASE 1: an unconfirmed record that matches input name, verifier,
+ *		and confirmed clientid.
+ *	CASE 4: any unconfirmed records with matching name and principal
+ *		that exist after an unconfirmed record has been replaced
+ *		as described above.
+ *
+ */
+int
+nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
+{
+	u32 			ip_addr = rqstp->rq_addr.sin_addr.s_addr;
+	struct xdr_netobj 	clname = { 
+		.len = setclid->se_namelen,
+		.data = setclid->se_name,
+	};
+	nfs4_verifier		clverifier = setclid->se_verf;
+	unsigned int 		strhashval;
+	struct nfs4_client *	conf, * unconf, * new, * clp;
+	int 			status;
+	
+	status = nfserr_inval;
+	if (!check_name(clname))
+		goto out;
+
+	/* 
+	 * XXX The Duplicate Request Cache (DRC) has been checked (??)
+	 * We get here on a DRC miss.
+	 */
+
+	strhashval = clientstr_hashval(clname.data, clname.len);
+
+	conf = NULL;
+	nfs4_lock_state();
+	list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
+		if (!cmp_name(&clp->cl_name, &clname))
+			continue;
+		/* 
+		 * CASE 0:
+		 * clname match, confirmed, different principal
+		 * or different ip_address
+		 */
+		status = nfserr_clid_inuse;
+		if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
+			printk("NFSD: setclientid: string in use by client"
+			"(clientid %08x/%08x)\n",
+			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+			goto out;
+		}
+		if (clp->cl_addr != ip_addr) { 
+			printk("NFSD: setclientid: string in use by client"
+			"(clientid %08x/%08x)\n",
+			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+			goto out;
+		}
+
+		/* 
+	 	 * cl_name match from a previous SETCLIENTID operation
+	 	 * XXX check for additional matches?
+		 */
+		conf = clp;
+		break;
+	}
+	unconf = NULL;
+	list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
+		if (!cmp_name(&clp->cl_name, &clname))
+			continue;
+		/* cl_name match from a previous SETCLIENTID operation */
+		unconf = clp;
+		break;
+	}
+	status = nfserr_resource;
+	if (!conf) {
+		/* 
+		 * CASE 4:
+		 * placed first, because it is the normal case.
+		 */
+		if (unconf)
+			expire_client(unconf);
+		if (!(new = create_client(clname)))
+			goto out;
+		copy_verf(new, &clverifier);
+		new->cl_addr = ip_addr;
+		copy_cred(&new->cl_cred,&rqstp->rq_cred);
+		gen_clid(new);
+		gen_confirm(new);
+		gen_callback(new, setclid);
+		add_to_unconfirmed(new, strhashval);
+	} else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
+		/*
+		 * CASE 1:
+		 * cl_name match, confirmed, principal match
+		 * verifier match: probable callback update
+		 *
+		 * remove any unconfirmed nfs4_client with 
+		 * matching cl_name, cl_verifier, and cl_clientid
+		 *
+		 * create and insert an unconfirmed nfs4_client with same 
+		 * cl_name, cl_verifier, and cl_clientid as existing 
+		 * nfs4_client,  but with the new callback info and a 
+		 * new cl_confirm
+		 */
+		if ((unconf) && 
+		    cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
+		     cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
+				expire_client(unconf);
+		}
+		if (!(new = create_client(clname)))
+			goto out;
+		copy_verf(new,&conf->cl_verifier);
+		new->cl_addr = ip_addr;
+		copy_cred(&new->cl_cred,&rqstp->rq_cred);
+		copy_clid(new, conf);
+		gen_confirm(new);
+		gen_callback(new, setclid);
+		add_to_unconfirmed(new,strhashval);
+	} else if (!unconf) {
+		/*
+		 * CASE 2:
+		 * clname match, confirmed, principal match
+		 * verfier does not match
+		 * no unconfirmed. create a new unconfirmed nfs4_client
+		 * using input clverifier, clname, and callback info
+		 * and generate a new cl_clientid and cl_confirm.
+		 */
+		if (!(new = create_client(clname)))
+			goto out;
+		copy_verf(new,&clverifier);
+		new->cl_addr = ip_addr;
+		copy_cred(&new->cl_cred,&rqstp->rq_cred);
+		gen_clid(new);
+		gen_confirm(new);
+		gen_callback(new, setclid);
+		add_to_unconfirmed(new, strhashval);
+	} else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
+		/*	
+		 * CASE3:
+		 * confirmed found (name, principal match)
+		 * confirmed verifier does not match input clverifier
+		 *
+		 * unconfirmed found (name match)
+		 * confirmed->cl_confirm != unconfirmed->cl_confirm
+		 *
+		 * remove unconfirmed.
+		 *
+		 * create an unconfirmed nfs4_client 
+		 * with same cl_name as existing confirmed nfs4_client, 
+		 * but with new callback info, new cl_clientid,
+		 * new cl_verifier and a new cl_confirm
+		 */
+		expire_client(unconf);
+		if (!(new = create_client(clname)))
+			goto out;
+		copy_verf(new,&clverifier);
+		new->cl_addr = ip_addr;
+		copy_cred(&new->cl_cred,&rqstp->rq_cred);
+		gen_clid(new);
+		gen_confirm(new);
+		gen_callback(new, setclid);
+		add_to_unconfirmed(new, strhashval);
+	} else {
+		/* No cases hit !!! */
+		status = nfserr_inval;
+		goto out;
+
+	}
+	setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
+	setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
+	memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
+	status = nfs_ok;
+out:
+	nfs4_unlock_state();
+	return status;
+}
+
+
+/*
+ * RFC 3010 has a complex implmentation description of processing a 
+ * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
+ * processing on a DRC miss, labeled as CASE1 - CASE4 below.
+ *
+ * NOTE: callback information will be processed here in a future patch
+ */
+int
+nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
+{
+	u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
+	struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
+	nfs4_verifier confirm = setclientid_confirm->sc_confirm; 
+	clientid_t * clid = &setclientid_confirm->sc_clientid;
+	int status;
+
+	if (STALE_CLIENTID(clid))
+		return nfserr_stale_clientid;
+	/* 
+	 * XXX The Duplicate Request Cache (DRC) has been checked (??)
+	 * We get here on a DRC miss.
+	 */
+
+	nfs4_lock_state();
+	clp = find_confirmed_client(clid);
+	if (clp) {
+		status = nfserr_inval;
+		/* 
+		 * Found a record for this clientid. If the IP addresses
+		 * don't match, return ERR_INVAL just as if the record had
+		 * not been found.
+		 */
+		if (clp->cl_addr != ip_addr) { 
+			printk("NFSD: setclientid: string in use by client"
+			"(clientid %08x/%08x)\n",
+			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+			goto out;
+		}
+		conf = clp;
+	}
+	clp = find_unconfirmed_client(clid);
+	if (clp) {
+		status = nfserr_inval;
+		if (clp->cl_addr != ip_addr) { 
+			printk("NFSD: setclientid: string in use by client"
+			"(clientid %08x/%08x)\n",
+			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+			goto out;
+		}
+		unconf = clp;
+	}
+	/* CASE 1: 
+	* unconf record that matches input clientid and input confirm.
+	* conf record that matches input clientid.
+	* conf  and unconf records match names, verifiers 
+	*/
+	if ((conf && unconf) && 
+	    (cmp_verf(&unconf->cl_confirm, &confirm)) &&
+	    (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
+	    (cmp_name(&conf->cl_name,&unconf->cl_name))  &&
+	    (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
+		if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred)) 
+			status = nfserr_clid_inuse;
+		else {
+			expire_client(conf);
+			clp = unconf;
+			move_to_confirmed(unconf);
+			status = nfs_ok;
+		}
+		goto out;
+	} 
+	/* CASE 2:
+	 * conf record that matches input clientid.
+	 * if unconf record that matches input clientid, then unconf->cl_name
+	 * or unconf->cl_verifier don't match the conf record.
+	 */
+	if ((conf && !unconf) || 
+	    ((conf && unconf) && 
+	     (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
+	      !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
+		if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
+			status = nfserr_clid_inuse;
+		} else {
+			clp = conf;
+			status = nfs_ok;
+		}
+		goto out;
+	}
+	/* CASE 3:
+	 * conf record not found.
+	 * unconf record found. 
+	 * unconf->cl_confirm matches input confirm
+	 */ 
+	if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
+		if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
+			status = nfserr_clid_inuse;
+		} else {
+			status = nfs_ok;
+			clp = unconf;
+			move_to_confirmed(unconf);
+		}
+		goto out;
+	}
+	/* CASE 4:
+	 * conf record not found, or if conf, then conf->cl_confirm does not
+	 * match input confirm.
+	 * unconf record not found, or if unconf, then unconf->cl_confirm 
+	 * does not match input confirm.
+	 */
+	if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
+	    (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
+		status = nfserr_stale_clientid;
+		goto out;
+	}
+	/* check that we have hit one of the cases...*/
+	status = nfserr_inval;
+	goto out;
+out:
+	if (!status)
+		nfsd4_probe_callback(clp);
+	nfs4_unlock_state();
+	return status;
+}
+
+/* 
+ * Open owner state (share locks)
+ */
+
+/* hash tables for nfs4_stateowner */
+#define OWNER_HASH_BITS              8
+#define OWNER_HASH_SIZE             (1 << OWNER_HASH_BITS)
+#define OWNER_HASH_MASK             (OWNER_HASH_SIZE - 1)
+
+#define ownerid_hashval(id) \
+        ((id) & OWNER_HASH_MASK)
+#define ownerstr_hashval(clientid, ownername) \
+        (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
+
+static struct list_head	ownerid_hashtbl[OWNER_HASH_SIZE];
+static struct list_head	ownerstr_hashtbl[OWNER_HASH_SIZE];
+
+/* hash table for nfs4_file */
+#define FILE_HASH_BITS                   8
+#define FILE_HASH_SIZE                  (1 << FILE_HASH_BITS)
+#define FILE_HASH_MASK                  (FILE_HASH_SIZE - 1)
+/* hash table for (open)nfs4_stateid */
+#define STATEID_HASH_BITS              10
+#define STATEID_HASH_SIZE              (1 << STATEID_HASH_BITS)
+#define STATEID_HASH_MASK              (STATEID_HASH_SIZE - 1)
+
+#define file_hashval(x) \
+        hash_ptr(x, FILE_HASH_BITS)
+#define stateid_hashval(owner_id, file_id)  \
+        (((owner_id) + (file_id)) & STATEID_HASH_MASK)
+
+static struct list_head file_hashtbl[FILE_HASH_SIZE];
+static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
+
+/* OPEN Share state helper functions */
+static inline struct nfs4_file *
+alloc_init_file(struct inode *ino)
+{
+	struct nfs4_file *fp;
+	unsigned int hashval = file_hashval(ino);
+
+	if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
+		INIT_LIST_HEAD(&fp->fi_hash);
+		INIT_LIST_HEAD(&fp->fi_perfile);
+		INIT_LIST_HEAD(&fp->fi_del_perfile);
+		list_add(&fp->fi_hash, &file_hashtbl[hashval]);
+		fp->fi_inode = igrab(ino);
+		fp->fi_id = current_fileid++;
+		alloc_file++;
+		return fp;
+	}
+	return NULL;
+}
+
+static void
+release_all_files(void)
+{
+	int i;
+	struct nfs4_file *fp;
+
+	for (i=0;i<FILE_HASH_SIZE;i++) {
+		while (!list_empty(&file_hashtbl[i])) {
+			fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
+			/* this should never be more than once... */
+			if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) {
+				printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
+			}
+			release_file(fp);
+		}
+	}
+}
+
+kmem_cache_t *stateowner_slab = NULL;
+
+static int
+nfsd4_init_slabs(void)
+{
+	stateowner_slab = kmem_cache_create("nfsd4_stateowners",
+			sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
+	if (stateowner_slab == NULL) {
+		dprintk("nfsd4: out of memory while initializing nfsv4\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static void
+nfsd4_free_slabs(void)
+{
+	int status = 0;
+
+	if (stateowner_slab)
+		status = kmem_cache_destroy(stateowner_slab);
+	stateowner_slab = NULL;
+	BUG_ON(status);
+}
+
+void
+nfs4_free_stateowner(struct kref *kref)
+{
+	struct nfs4_stateowner *sop =
+		container_of(kref, struct nfs4_stateowner, so_ref);
+	kfree(sop->so_owner.data);
+	kmem_cache_free(stateowner_slab, sop);
+}
+
+static inline struct nfs4_stateowner *
+alloc_stateowner(struct xdr_netobj *owner)
+{
+	struct nfs4_stateowner *sop;
+
+	if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
+		if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
+			memcpy(sop->so_owner.data, owner->data, owner->len);
+			sop->so_owner.len = owner->len;
+			kref_init(&sop->so_ref);
+			return sop;
+		} 
+		kmem_cache_free(stateowner_slab, sop);
+	}
+	return NULL;
+}
+
+static struct nfs4_stateowner *
+alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
+	struct nfs4_stateowner *sop;
+	struct nfs4_replay *rp;
+	unsigned int idhashval;
+
+	if (!(sop = alloc_stateowner(&open->op_owner)))
+		return NULL;
+	idhashval = ownerid_hashval(current_ownerid);
+	INIT_LIST_HEAD(&sop->so_idhash);
+	INIT_LIST_HEAD(&sop->so_strhash);
+	INIT_LIST_HEAD(&sop->so_perclient);
+	INIT_LIST_HEAD(&sop->so_perfilestate);
+	INIT_LIST_HEAD(&sop->so_perlockowner);  /* not used */
+	INIT_LIST_HEAD(&sop->so_close_lru);
+	sop->so_time = 0;
+	list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
+	list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
+	list_add(&sop->so_perclient, &clp->cl_perclient);
+	add_perclient++;
+	sop->so_is_open_owner = 1;
+	sop->so_id = current_ownerid++;
+	sop->so_client = clp;
+	sop->so_seqid = open->op_seqid;
+	sop->so_confirmed = 0;
+	rp = &sop->so_replay;
+	rp->rp_status = NFSERR_SERVERFAULT;
+	rp->rp_buflen = 0;
+	rp->rp_buf = rp->rp_ibuf;
+	return sop;
+}
+
+static void
+release_stateid_lockowners(struct nfs4_stateid *open_stp)
+{
+	struct nfs4_stateowner *lock_sop;
+
+	while (!list_empty(&open_stp->st_perlockowner)) {
+		lock_sop = list_entry(open_stp->st_perlockowner.next,
+				struct nfs4_stateowner, so_perlockowner);
+		/* list_del(&open_stp->st_perlockowner);  */
+		BUG_ON(lock_sop->so_is_open_owner);
+		release_stateowner(lock_sop);
+	}
+}
+
+static void
+unhash_stateowner(struct nfs4_stateowner *sop)
+{
+	struct nfs4_stateid *stp;
+
+	list_del(&sop->so_idhash);
+	list_del(&sop->so_strhash);
+	if (sop->so_is_open_owner) {
+		list_del(&sop->so_perclient);
+		del_perclient++;
+	}
+	list_del(&sop->so_perlockowner);
+	while (!list_empty(&sop->so_perfilestate)) {
+		stp = list_entry(sop->so_perfilestate.next, 
+			struct nfs4_stateid, st_perfilestate);
+		if (sop->so_is_open_owner)
+			release_stateid(stp, OPEN_STATE);
+		else
+			release_stateid(stp, LOCK_STATE);
+	}
+}
+
+static void
+release_stateowner(struct nfs4_stateowner *sop)
+{
+	unhash_stateowner(sop);
+	list_del(&sop->so_close_lru);
+	nfs4_put_stateowner(sop);
+}
+
+static inline void
+init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
+	struct nfs4_stateowner *sop = open->op_stateowner;
+	unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
+
+	INIT_LIST_HEAD(&stp->st_hash);
+	INIT_LIST_HEAD(&stp->st_perfilestate);
+	INIT_LIST_HEAD(&stp->st_perlockowner);
+	INIT_LIST_HEAD(&stp->st_perfile);
+	list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
+	list_add(&stp->st_perfilestate, &sop->so_perfilestate);
+	list_add_perfile++;
+	list_add(&stp->st_perfile, &fp->fi_perfile);
+	stp->st_stateowner = sop;
+	stp->st_file = fp;
+	stp->st_stateid.si_boot = boot_time;
+	stp->st_stateid.si_stateownerid = sop->so_id;
+	stp->st_stateid.si_fileid = fp->fi_id;
+	stp->st_stateid.si_generation = 0;
+	stp->st_access_bmap = 0;
+	stp->st_deny_bmap = 0;
+	__set_bit(open->op_share_access, &stp->st_access_bmap);
+	__set_bit(open->op_share_deny, &stp->st_deny_bmap);
+}
+
+static void
+release_stateid(struct nfs4_stateid *stp, int flags)
+{
+	struct file *filp = stp->st_vfs_file;
+
+	list_del(&stp->st_hash);
+	list_del_perfile++;
+	list_del(&stp->st_perfile);
+	list_del(&stp->st_perfilestate);
+	if (flags & OPEN_STATE) {
+		release_stateid_lockowners(stp);
+		stp->st_vfs_file = NULL;
+		nfsd_close(filp);
+		vfsclose++;
+	} else if (flags & LOCK_STATE)
+		locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
+	kfree(stp);
+	stp = NULL;
+}
+
+static void
+release_file(struct nfs4_file *fp)
+{
+	free_file++;
+	list_del(&fp->fi_hash);
+	iput(fp->fi_inode);
+	kfree(fp);
+}	
+
+void
+move_to_close_lru(struct nfs4_stateowner *sop)
+{
+	dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
+
+	unhash_stateowner(sop);
+	list_add_tail(&sop->so_close_lru, &close_lru);
+	sop->so_time = get_seconds();
+}
+
+void
+release_state_owner(struct nfs4_stateid *stp, int flag)
+{
+	struct nfs4_stateowner *sop = stp->st_stateowner;
+	struct nfs4_file *fp = stp->st_file;
+
+	dprintk("NFSD: release_state_owner\n");
+	release_stateid(stp, flag);
+
+	/* place unused nfs4_stateowners on so_close_lru list to be
+	 * released by the laundromat service after the lease period
+	 * to enable us to handle CLOSE replay
+	 */
+	if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
+		move_to_close_lru(sop);
+	/* unused nfs4_file's are releseed. XXX slab cache? */
+	if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) {
+		release_file(fp);
+	}
+}
+
+static int
+cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
+	return ((sop->so_owner.len == owner->len) && 
+	 !memcmp(sop->so_owner.data, owner->data, owner->len) && 
+	  (sop->so_client->cl_clientid.cl_id == clid->cl_id));
+}
+
+static struct nfs4_stateowner *
+find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
+{
+	struct nfs4_stateowner *so = NULL;
+
+	list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
+		if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
+			return so;
+	}
+	return NULL;
+}
+
+/* search file_hashtbl[] for file */
+static struct nfs4_file *
+find_file(struct inode *ino)
+{
+	unsigned int hashval = file_hashval(ino);
+	struct nfs4_file *fp;
+
+	list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
+		if (fp->fi_inode == ino)
+			return fp;
+	}
+	return NULL;
+}
+
+#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
+#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
+
+void
+set_access(unsigned int *access, unsigned long bmap) {
+	int i;
+
+	*access = 0;
+	for (i = 1; i < 4; i++) {
+		if (test_bit(i, &bmap))
+			*access |= i;
+	}
+}
+
+void
+set_deny(unsigned int *deny, unsigned long bmap) {
+	int i;
+
+	*deny = 0;
+	for (i = 0; i < 4; i++) {
+		if (test_bit(i, &bmap))
+			*deny |= i ;
+	}
+}
+
+static int
+test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
+	unsigned int access, deny;
+
+	set_access(&access, stp->st_access_bmap);
+	set_deny(&deny, stp->st_deny_bmap);
+	if ((access & open->op_share_deny) || (deny & open->op_share_access))
+		return 0;
+	return 1;
+}
+
+/*
+ * Called to check deny when READ with all zero stateid or
+ * WRITE with all zero or all one stateid
+ */
+int
+nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
+{
+	struct inode *ino = current_fh->fh_dentry->d_inode;
+	struct nfs4_file *fp;
+	struct nfs4_stateid *stp;
+
+	dprintk("NFSD: nfs4_share_conflict\n");
+
+	fp = find_file(ino);
+	if (fp) {
+	/* Search for conflicting share reservations */
+		list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
+			if (test_bit(deny_type, &stp->st_deny_bmap) ||
+			    test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
+				return nfserr_share_denied;
+		}
+	}
+	return nfs_ok;
+}
+
+static inline void
+nfs4_file_downgrade(struct file *filp, unsigned int share_access)
+{
+	if (share_access & NFS4_SHARE_ACCESS_WRITE) {
+		put_write_access(filp->f_dentry->d_inode);
+		filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
+	}
+}
+
+/*
+ * Recall a delegation
+ */
+static int
+do_recall(void *__dp)
+{
+	struct nfs4_delegation *dp = __dp;
+
+	daemonize("nfsv4-recall");
+
+	nfsd4_cb_recall(dp);
+	return 0;
+}
+
+/*
+ * Spawn a thread to perform a recall on the delegation represented
+ * by the lease (file_lock)
+ *
+ * Called from break_lease() with lock_kernel() held.
+ * Note: we assume break_lease will only call this *once* for any given
+ * lease.
+ */
+static
+void nfsd_break_deleg_cb(struct file_lock *fl)
+{
+	struct nfs4_delegation *dp=  (struct nfs4_delegation *)fl->fl_owner;
+	struct task_struct *t;
+
+	dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
+	if (!dp)
+		return;
+
+	/* We're assuming the state code never drops its reference
+	 * without first removing the lease.  Since we're in this lease
+	 * callback (and since the lease code is serialized by the kernel
+	 * lock) we know the server hasn't removed the lease yet, we know
+	 * it's safe to take a reference: */
+	atomic_inc(&dp->dl_count);
+
+	spin_lock(&recall_lock);
+	list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
+	spin_unlock(&recall_lock);
+
+	/* only place dl_time is set. protected by lock_kernel*/
+	dp->dl_time = get_seconds();
+
+	/* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
+	fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
+
+	t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
+	if (IS_ERR(t)) {
+		struct nfs4_client *clp = dp->dl_client;
+
+		printk(KERN_INFO "NFSD: Callback thread failed for "
+			"for client (clientid %08x/%08x)\n",
+			clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
+		nfs4_put_delegation(dp);
+	}
+}
+
+/*
+ * The file_lock is being reapd.
+ *
+ * Called by locks_free_lock() with lock_kernel() held.
+ */
+static
+void nfsd_release_deleg_cb(struct file_lock *fl)
+{
+	struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
+
+	dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
+
+	if (!(fl->fl_flags & FL_LEASE) || !dp)
+		return;
+	dp->dl_flock = NULL;
+}
+
+/*
+ * Set the delegation file_lock back pointer.
+ *
+ * Called from __setlease() with lock_kernel() held.
+ */
+static
+void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
+{
+	struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
+
+	dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
+	if (!dp)
+		return;
+	dp->dl_flock = new;
+}
+
+/*
+ * Called from __setlease() with lock_kernel() held
+ */
+static
+int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
+{
+	struct nfs4_delegation *onlistd =
+		(struct nfs4_delegation *)onlist->fl_owner;
+	struct nfs4_delegation *tryd =
+		(struct nfs4_delegation *)try->fl_owner;
+
+	if (onlist->fl_lmops != try->fl_lmops)
+		return 0;
+
+	return onlistd->dl_client == tryd->dl_client;
+}
+
+
+static
+int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
+{
+	if (arg & F_UNLCK)
+		return lease_modify(onlist, arg);
+	else
+		return -EAGAIN;
+}
+
+struct lock_manager_operations nfsd_lease_mng_ops = {
+	.fl_break = nfsd_break_deleg_cb,
+	.fl_release_private = nfsd_release_deleg_cb,
+	.fl_copy_lock = nfsd_copy_lock_deleg_cb,
+	.fl_mylease = nfsd_same_client_deleg_cb,
+	.fl_change = nfsd_change_deleg_cb,
+};
+
+
+/*
+ * nfsd4_process_open1()
+ * 	lookup stateowner.
+ * 		found:
+ * 			check confirmed 
+ * 				confirmed:
+ * 					check seqid
+ * 				not confirmed:
+ * 					delete owner
+ * 					create new owner
+ * 		notfound:
+ * 			verify clientid
+ * 			create new owner
+ *
+ * called with nfs4_lock_state() held.
+ */
+int
+nfsd4_process_open1(struct nfsd4_open *open)
+{
+	int status;
+	clientid_t *clientid = &open->op_clientid;
+	struct nfs4_client *clp = NULL;
+	unsigned int strhashval;
+	struct nfs4_stateowner *sop = NULL;
+
+	status = nfserr_inval;
+	if (!check_name(open->op_owner))
+		goto out;
+
+	if (STALE_CLIENTID(&open->op_clientid))
+		return nfserr_stale_clientid;
+
+	strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
+	sop = find_openstateowner_str(strhashval, open);
+	if (sop) {
+		open->op_stateowner = sop;
+		/* check for replay */
+		if (open->op_seqid == sop->so_seqid){
+			if (sop->so_replay.rp_buflen)
+				return NFSERR_REPLAY_ME;
+			else {
+				/* The original OPEN failed so spectacularly
+				 * that we don't even have replay data saved!
+				 * Therefore, we have no choice but to continue
+				 * processing this OPEN; presumably, we'll
+				 * fail again for the same reason.
+				 */
+				dprintk("nfsd4_process_open1:"
+					" replay with no replay cache\n");
+				goto renew;
+			}
+		} else if (sop->so_confirmed) {
+			if (open->op_seqid == sop->so_seqid + 1)
+				goto renew;
+			status = nfserr_bad_seqid;
+			goto out;
+		} else {
+			/* If we get here, we received an OPEN for an
+			 * unconfirmed nfs4_stateowner. Since the seqid's are
+			 * different, purge the existing nfs4_stateowner, and
+			 * instantiate a new one.
+			 */
+			clp = sop->so_client;
+			release_stateowner(sop);
+		}
+	} else {
+		/* nfs4_stateowner not found.
+		 * Verify clientid and instantiate new nfs4_stateowner.
+		 * If verify fails this is presumably the result of the
+		 * client's lease expiring.
+		 */
+		status = nfserr_expired;
+		clp = find_confirmed_client(clientid);
+		if (clp == NULL)
+			goto out;
+	}
+	status = nfserr_resource;
+	sop = alloc_init_open_stateowner(strhashval, clp, open);
+	if (sop == NULL)
+		goto out;
+	open->op_stateowner = sop;
+renew:
+	status = nfs_ok;
+	renew_client(sop->so_client);
+out:
+	if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
+		status = nfserr_reclaim_bad;
+	return status;
+}
+
+static int
+nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
+{
+	struct nfs4_stateid *local;
+	int status = nfserr_share_denied;
+	struct nfs4_stateowner *sop = open->op_stateowner;
+
+	list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
+		/* ignore lock owners */
+		if (local->st_stateowner->so_is_open_owner == 0)
+			continue;
+		/* remember if we have seen this open owner */
+		if (local->st_stateowner == sop)
+			*stpp = local;
+		/* check for conflicting share reservations */
+		if (!test_share(local, open))
+			goto out;
+	}
+	status = 0;
+out:
+	return status;
+}
+
+static int
+nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
+		struct svc_fh *cur_fh, int flags)
+{
+	struct nfs4_stateid *stp;
+	int status;
+
+	stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
+	if (stp == NULL)
+		return nfserr_resource;
+
+	status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, &stp->st_vfs_file);
+	if (status) {
+		if (status == nfserr_dropit)
+			status = nfserr_jukebox;
+		kfree(stp);
+		return status;
+	}
+	vfsopen++;
+	*stpp = stp;
+	return 0;
+}
+
+static inline int
+nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
+		struct nfsd4_open *open)
+{
+	struct iattr iattr = {
+		.ia_valid = ATTR_SIZE,
+		.ia_size = 0,
+	};
+	if (!open->op_truncate)
+		return 0;
+	if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
+		return -EINVAL;
+	return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
+}
+
+static int
+nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
+{
+	struct file *filp = stp->st_vfs_file;
+	struct inode *inode = filp->f_dentry->d_inode;
+	unsigned int share_access;
+	int status;
+
+	set_access(&share_access, stp->st_access_bmap);
+	share_access = ~share_access;
+	share_access &= open->op_share_access;
+
+	if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
+		return nfsd4_truncate(rqstp, cur_fh, open);
+
+	status = get_write_access(inode);
+	if (status)
+		return nfserrno(status);
+	status = nfsd4_truncate(rqstp, cur_fh, open);
+	if (status) {
+		put_write_access(inode);
+		return status;
+	}
+	/* remember the open */
+	filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
+	set_bit(open->op_share_access, &stp->st_access_bmap);
+	set_bit(open->op_share_deny, &stp->st_deny_bmap);
+
+	return nfs_ok;
+}
+
+
+/* decrement seqid on successful reclaim, it will be bumped in encode_open */
+static void
+nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
+{
+	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
+		if (*status)
+			*status = nfserr_reclaim_bad;
+		else {
+			open->op_stateowner->so_confirmed = 1;
+			open->op_stateowner->so_seqid--;
+		}
+	}
+}
+
+/*
+ * Attempt to hand out a delegation.
+ */
+static void
+nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
+{
+	struct nfs4_delegation *dp;
+	struct nfs4_stateowner *sop = stp->st_stateowner;
+	struct nfs4_callback *cb = &sop->so_client->cl_callback;
+	struct file_lock fl, *flp = &fl;
+	int status, flag = 0;
+
+	flag = NFS4_OPEN_DELEGATE_NONE;
+	if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
+	     || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
+		goto out;
+
+	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
+		flag = NFS4_OPEN_DELEGATE_WRITE;
+	else
+		flag = NFS4_OPEN_DELEGATE_READ;
+
+	dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
+	if (dp == NULL) {
+		flag = NFS4_OPEN_DELEGATE_NONE;
+		goto out;
+	}
+	locks_init_lock(&fl);
+	fl.fl_lmops = &nfsd_lease_mng_ops;
+	fl.fl_flags = FL_LEASE;
+	fl.fl_end = OFFSET_MAX;
+	fl.fl_owner =  (fl_owner_t)dp;
+	fl.fl_file = stp->st_vfs_file;
+	fl.fl_pid = current->tgid;
+
+	/* setlease checks to see if delegation should be handed out.
+	 * the lock_manager callbacks fl_mylease and fl_change are used
+	 */
+	if ((status = setlease(stp->st_vfs_file,
+		flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
+		dprintk("NFSD: setlease failed [%d], no delegation\n", status);
+		list_del(&dp->dl_del_perfile);
+		list_del(&dp->dl_del_perclnt);
+		nfs4_put_delegation(dp);
+		free_delegation++;
+		flag = NFS4_OPEN_DELEGATE_NONE;
+		goto out;
+	}
+
+	memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
+
+	dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
+	             dp->dl_stateid.si_boot,
+	             dp->dl_stateid.si_stateownerid,
+	             dp->dl_stateid.si_fileid,
+	             dp->dl_stateid.si_generation);
+out:
+	open->op_delegate_type = flag;
+}
+
+/*
+ * called with nfs4_lock_state() held.
+ */
+int
+nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
+{
+	struct nfs4_file *fp = NULL;
+	struct inode *ino = current_fh->fh_dentry->d_inode;
+	struct nfs4_stateid *stp = NULL;
+	int status;
+
+	status = nfserr_inval;
+	if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
+		goto out;
+	/*
+	 * Lookup file; if found, lookup stateid and check open request,
+	 * and check for delegations in the process of being recalled.
+	 * If not found, create the nfs4_file struct
+	 */
+	fp = find_file(ino);
+	if (fp) {
+		if ((status = nfs4_check_open(fp, open, &stp)))
+			goto out;
+	} else {
+		status = nfserr_resource;
+		fp = alloc_init_file(ino);
+		if (fp == NULL)
+			goto out;
+	}
+
+	/*
+	 * OPEN the file, or upgrade an existing OPEN.
+	 * If truncate fails, the OPEN fails.
+	 */
+	if (stp) {
+		/* Stateid was found, this is an OPEN upgrade */
+		status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
+		if (status)
+			goto out;
+	} else {
+		/* Stateid was not found, this is a new OPEN */
+		int flags = 0;
+		if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
+			flags = MAY_WRITE;
+		else
+			flags = MAY_READ;
+		if ((status = nfs4_new_open(rqstp, &stp, current_fh, flags)))
+			goto out;
+		init_stateid(stp, fp, open);
+		status = nfsd4_truncate(rqstp, current_fh, open);
+		if (status) {
+			release_stateid(stp, OPEN_STATE);
+			goto out;
+		}
+	}
+	memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
+
+	/*
+	* Attempt to hand out a delegation. No error return, because the
+	* OPEN succeeds even if we fail.
+	*/
+	nfs4_open_delegation(current_fh, open, stp);
+
+	status = nfs_ok;
+
+	dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
+	            stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
+	            stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
+out:
+	/* take the opportunity to clean up unused state */
+	if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
+		release_file(fp);
+
+	/* CLAIM_PREVIOUS has different error returns */
+	nfs4_set_claim_prev(open, &status);
+	/*
+	* To finish the open response, we just need to set the rflags.
+	*/
+	open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
+	if (!open->op_stateowner->so_confirmed)
+		open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
+
+	return status;
+}
+
+static struct work_struct laundromat_work;
+static void laundromat_main(void *);
+static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
+
+int 
+nfsd4_renew(clientid_t *clid)
+{
+	struct nfs4_client *clp;
+	int status;
+
+	nfs4_lock_state();
+	dprintk("process_renew(%08x/%08x): starting\n", 
+			clid->cl_boot, clid->cl_id);
+	status = nfserr_stale_clientid;
+	if (STALE_CLIENTID(clid))
+		goto out;
+	clp = find_confirmed_client(clid);
+	status = nfserr_expired;
+	if (clp == NULL) {
+		/* We assume the client took too long to RENEW. */
+		dprintk("nfsd4_renew: clientid not found!\n");
+		goto out;
+	}
+	renew_client(clp);
+	status = nfserr_cb_path_down;
+	if (!list_empty(&clp->cl_del_perclnt)
+			&& !atomic_read(&clp->cl_callback.cb_set))
+		goto out;
+	status = nfs_ok;
+out:
+	nfs4_unlock_state();
+	return status;
+}
+
+time_t
+nfs4_laundromat(void)
+{
+	struct nfs4_client *clp;
+	struct nfs4_stateowner *sop;
+	struct nfs4_delegation *dp;
+	struct list_head *pos, *next, reaplist;
+	time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
+	time_t t, clientid_val = NFSD_LEASE_TIME;
+	time_t u, test_val = NFSD_LEASE_TIME;
+
+	nfs4_lock_state();
+
+	dprintk("NFSD: laundromat service - starting\n");
+	list_for_each_safe(pos, next, &client_lru) {
+		clp = list_entry(pos, struct nfs4_client, cl_lru);
+		if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
+			t = clp->cl_time - cutoff;
+			if (clientid_val > t)
+				clientid_val = t;
+			break;
+		}
+		dprintk("NFSD: purging unused client (clientid %08x)\n",
+			clp->cl_clientid.cl_id);
+		expire_client(clp);
+	}
+	INIT_LIST_HEAD(&reaplist);
+	spin_lock(&recall_lock);
+	list_for_each_safe(pos, next, &del_recall_lru) {
+		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+		if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
+			u = dp->dl_time - cutoff;
+			if (test_val > u)
+				test_val = u;
+			break;
+		}
+		dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
+			            dp, dp->dl_flock);
+		list_move(&dp->dl_recall_lru, &reaplist);
+	}
+	spin_unlock(&recall_lock);
+	list_for_each_safe(pos, next, &reaplist) {
+		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+		list_del_init(&dp->dl_recall_lru);
+		unhash_delegation(dp);
+	}
+	test_val = NFSD_LEASE_TIME;
+	list_for_each_safe(pos, next, &close_lru) {
+		sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
+		if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
+			u = sop->so_time - cutoff;
+			if (test_val > u)
+				test_val = u;
+			break;
+		}
+		dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
+			sop->so_id);
+		list_del(&sop->so_close_lru);
+		nfs4_put_stateowner(sop);
+	}
+	if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
+		clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
+	nfs4_unlock_state();
+	return clientid_val;
+}
+
+void
+laundromat_main(void *not_used)
+{
+	time_t t;
+
+	t = nfs4_laundromat();
+	dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
+	schedule_delayed_work(&laundromat_work, t*HZ);
+}
+
+/* search ownerid_hashtbl[] and close_lru for stateid owner
+ * (stateid->si_stateownerid)
+ */
+struct nfs4_stateowner *
+find_openstateowner_id(u32 st_id, int flags) {
+	struct nfs4_stateowner *local = NULL;
+
+	dprintk("NFSD: find_openstateowner_id %d\n", st_id);
+	if (flags & CLOSE_STATE) {
+		list_for_each_entry(local, &close_lru, so_close_lru) {
+			if (local->so_id == st_id)
+				return local;
+		}
+	}
+	return NULL;
+}
+
+static inline int
+nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
+{
+	return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
+}
+
+static int
+STALE_STATEID(stateid_t *stateid)
+{
+	if (stateid->si_boot == boot_time)
+		return 0;
+	printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
+		stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
+		stateid->si_generation);
+	return 1;
+}
+
+static inline int
+access_permit_read(unsigned long access_bmap)
+{
+	return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
+		test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
+		test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
+}
+
+static inline int
+access_permit_write(unsigned long access_bmap)
+{
+	return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
+		test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
+}
+
+static
+int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
+{
+        int status = nfserr_openmode;
+
+	if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
+                goto out;
+	if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
+                goto out;
+	status = nfs_ok;
+out:
+	return status;
+}
+
+static inline int
+nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
+{
+	if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
+		return nfserr_openmode;
+	else
+		return nfs_ok;
+}
+
+static inline int
+check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
+{
+	/* Trying to call delegreturn with a special stateid? Yuch: */
+	if (!(flags & (RD_STATE | WR_STATE)))
+		return nfserr_bad_stateid;
+	else if (ONE_STATEID(stateid) && (flags & RD_STATE))
+		return nfs_ok;
+	else if (nfs4_in_grace()) {
+		/* Answer in remaining cases depends on existance of
+		 * conflicting state; so we must wait out the grace period. */
+		return nfserr_grace;
+	} else if (flags & WR_STATE)
+		return nfs4_share_conflict(current_fh,
+				NFS4_SHARE_DENY_WRITE);
+	else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
+		return nfs4_share_conflict(current_fh,
+				NFS4_SHARE_DENY_READ);
+}
+
+/*
+ * Allow READ/WRITE during grace period on recovered state only for files
+ * that are not able to provide mandatory locking.
+ */
+static inline int
+io_during_grace_disallowed(struct inode *inode, int flags)
+{
+	return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
+		&& MANDATORY_LOCK(inode);
+}
+
+/*
+* Checks for stateid operations
+*/
+int
+nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
+{
+	struct nfs4_stateid *stp = NULL;
+	struct nfs4_delegation *dp = NULL;
+	stateid_t *stidp;
+	struct inode *ino = current_fh->fh_dentry->d_inode;
+	int status;
+
+	dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
+		stateid->si_boot, stateid->si_stateownerid, 
+		stateid->si_fileid, stateid->si_generation); 
+	if (filpp)
+		*filpp = NULL;
+
+	if (io_during_grace_disallowed(ino, flags))
+		return nfserr_grace;
+
+	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+		return check_special_stateids(current_fh, stateid, flags);
+
+	/* STALE STATEID */
+	status = nfserr_stale_stateid;
+	if (STALE_STATEID(stateid)) 
+		goto out;
+
+	/* BAD STATEID */
+	status = nfserr_bad_stateid;
+	if (!stateid->si_fileid) { /* delegation stateid */
+		if(!(dp = find_delegation_stateid(ino, stateid))) {
+			dprintk("NFSD: delegation stateid not found\n");
+			if (nfs4_in_grace())
+				status = nfserr_grace;
+			goto out;
+		}
+		stidp = &dp->dl_stateid;
+	} else { /* open or lock stateid */
+		if (!(stp = find_stateid(stateid, flags))) {
+			dprintk("NFSD: open or lock stateid not found\n");
+			if (nfs4_in_grace())
+				status = nfserr_grace;
+			goto out;
+		}
+		if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
+			goto out;
+		if (!stp->st_stateowner->so_confirmed)
+			goto out;
+		stidp = &stp->st_stateid;
+	}
+	if (stateid->si_generation > stidp->si_generation)
+		goto out;
+
+	/* OLD STATEID */
+	status = nfserr_old_stateid;
+	if (stateid->si_generation < stidp->si_generation)
+		goto out;
+	if (stp) {
+		if ((status = nfs4_check_openmode(stp,flags)))
+			goto out;
+		renew_client(stp->st_stateowner->so_client);
+		if (filpp)
+			*filpp = stp->st_vfs_file;
+	} else if (dp) {
+		if ((status = nfs4_check_delegmode(dp, flags)))
+			goto out;
+		renew_client(dp->dl_client);
+		if (flags & DELEG_RET)
+			unhash_delegation(dp);
+		if (filpp)
+			*filpp = dp->dl_vfs_file;
+	}
+	status = nfs_ok;
+out:
+	return status;
+}
+
+
+/* 
+ * Checks for sequence id mutating operations. 
+ */
+int
+nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
+{
+	int status;
+	struct nfs4_stateid *stp;
+	struct nfs4_stateowner *sop;
+
+	dprintk("NFSD: preprocess_seqid_op: seqid=%d " 
+			"stateid = (%08x/%08x/%08x/%08x)\n", seqid,
+		stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
+		stateid->si_generation);
+			        
+	*stpp = NULL;
+	*sopp = NULL;
+
+	status = nfserr_bad_stateid;
+	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
+		printk("NFSD: preprocess_seqid_op: magic stateid!\n");
+		goto out;
+	}
+
+	status = nfserr_stale_stateid;
+	if (STALE_STATEID(stateid))
+		goto out;
+	/*
+	* We return BAD_STATEID if filehandle doesn't match stateid, 
+	* the confirmed flag is incorrecly set, or the generation 
+	* number is incorrect.  
+	* If there is no entry in the openfile table for this id, 
+	* we can't always return BAD_STATEID;
+	* this might be a retransmitted CLOSE which has arrived after 
+	* the openfile has been released.
+	*/
+	if (!(stp = find_stateid(stateid, flags)))
+		goto no_nfs4_stateid;
+
+	status = nfserr_bad_stateid;
+
+	/* for new lock stateowners:
+	 * check that the lock->v.new.open_stateid
+	 * refers to an open stateowner
+	 *
+	 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
+	 * as the open_stateid->st_stateowner->so_client->clientid
+	 */
+	if (lockclid) {
+		struct nfs4_stateowner *sop = stp->st_stateowner;
+		struct nfs4_client *clp = sop->so_client;
+
+		if (!sop->so_is_open_owner)
+			goto out;
+		if (!cmp_clid(&clp->cl_clientid, lockclid))
+			goto out;
+	}
+
+	if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
+		printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
+		goto out;
+	}
+
+	*stpp = stp;
+	*sopp = sop = stp->st_stateowner;
+
+	/*
+	*  We now validate the seqid and stateid generation numbers.
+	*  For the moment, we ignore the possibility of 
+	*  generation number wraparound.
+	*/
+	if (seqid != sop->so_seqid + 1)
+		goto check_replay;
+
+	if (sop->so_confirmed) {
+		if (flags & CONFIRM) {
+			printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
+			goto out;
+		}
+	}
+	else {
+		if (!(flags & CONFIRM)) {
+			printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
+			goto out;
+		}
+	}
+	if (stateid->si_generation > stp->st_stateid.si_generation) {
+		printk("NFSD: preprocess_seqid_op: future stateid?!\n");
+		goto out;
+	}
+
+	status = nfserr_old_stateid;
+	if (stateid->si_generation < stp->st_stateid.si_generation) {
+		printk("NFSD: preprocess_seqid_op: old stateid!\n");
+		goto out;
+	}
+	/* XXX renew the client lease here */
+	status = nfs_ok;
+
+out:
+	return status;
+
+no_nfs4_stateid:
+
+	/*
+	* We determine whether this is a bad stateid or a replay, 
+	* starting by trying to look up the stateowner.
+	* If stateowner is not found - stateid is bad.
+	*/
+	if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
+		printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
+		status = nfserr_bad_stateid;
+		goto out;
+	}
+	*sopp = sop;
+
+check_replay:
+	if (seqid == sop->so_seqid) {
+		printk("NFSD: preprocess_seqid_op: retransmission?\n");
+		/* indicate replay to calling function */
+		status = NFSERR_REPLAY_ME;
+	} else  {
+		printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
+
+		*sopp = NULL;
+		status = nfserr_bad_seqid;
+	}
+	goto out;
+}
+
+int
+nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
+{
+	int status;
+	struct nfs4_stateowner *sop;
+	struct nfs4_stateid *stp;
+
+	dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
+			(int)current_fh->fh_dentry->d_name.len,
+			current_fh->fh_dentry->d_name.name);
+
+	if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
+		goto out;
+
+	nfs4_lock_state();
+
+	if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
+					&oc->oc_req_stateid,
+					CHECK_FH | CONFIRM | OPEN_STATE,
+					&oc->oc_stateowner, &stp, NULL)))
+		goto out; 
+
+	sop = oc->oc_stateowner;
+	sop->so_confirmed = 1;
+	update_stateid(&stp->st_stateid);
+	memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
+	dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d " 
+		"stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
+		         stp->st_stateid.si_boot,
+		         stp->st_stateid.si_stateownerid,
+		         stp->st_stateid.si_fileid,
+		         stp->st_stateid.si_generation);
+out:
+	if (oc->oc_stateowner)
+		nfs4_get_stateowner(oc->oc_stateowner);
+	nfs4_unlock_state();
+	return status;
+}
+
+
+/*
+ * unset all bits in union bitmap (bmap) that
+ * do not exist in share (from successful OPEN_DOWNGRADE)
+ */
+static void
+reset_union_bmap_access(unsigned long access, unsigned long *bmap)
+{
+	int i;
+	for (i = 1; i < 4; i++) {
+		if ((i & access) != i)
+			__clear_bit(i, bmap);
+	}
+}
+
+static void
+reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
+{
+	int i;
+	for (i = 0; i < 4; i++) {
+		if ((i & deny) != i)
+			__clear_bit(i, bmap);
+	}
+}
+
+int
+nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
+{
+	int status;
+	struct nfs4_stateid *stp;
+	unsigned int share_access;
+
+	dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", 
+			(int)current_fh->fh_dentry->d_name.len,
+			current_fh->fh_dentry->d_name.name);
+
+	if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
+		return nfserr_inval;
+
+	nfs4_lock_state();
+	if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, 
+					&od->od_stateid, 
+					CHECK_FH | OPEN_STATE, 
+					&od->od_stateowner, &stp, NULL)))
+		goto out; 
+
+	status = nfserr_inval;
+	if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
+		dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
+			stp->st_access_bmap, od->od_share_access);
+		goto out;
+	}
+	if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
+		dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
+			stp->st_deny_bmap, od->od_share_deny);
+		goto out;
+	}
+	set_access(&share_access, stp->st_access_bmap);
+	nfs4_file_downgrade(stp->st_vfs_file,
+	                    share_access & ~od->od_share_access);
+
+	reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
+	reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
+
+	update_stateid(&stp->st_stateid);
+	memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
+	status = nfs_ok;
+out:
+	if (od->od_stateowner)
+		nfs4_get_stateowner(od->od_stateowner);
+	nfs4_unlock_state();
+	return status;
+}
+
+/*
+ * nfs4_unlock_state() called after encode
+ */
+int
+nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
+{
+	int status;
+	struct nfs4_stateid *stp;
+
+	dprintk("NFSD: nfsd4_close on file %.*s\n", 
+			(int)current_fh->fh_dentry->d_name.len,
+			current_fh->fh_dentry->d_name.name);
+
+	nfs4_lock_state();
+	/* check close_lru for replay */
+	if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, 
+					&close->cl_stateid, 
+					CHECK_FH | OPEN_STATE | CLOSE_STATE,
+					&close->cl_stateowner, &stp, NULL)))
+		goto out; 
+	/*
+	*  Return success, but first update the stateid.
+	*/
+	status = nfs_ok;
+	update_stateid(&stp->st_stateid);
+	memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
+
+	/* release_state_owner() calls nfsd_close() if needed */
+	release_state_owner(stp, OPEN_STATE);
+out:
+	if (close->cl_stateowner)
+		nfs4_get_stateowner(close->cl_stateowner);
+	nfs4_unlock_state();
+	return status;
+}
+
+int
+nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
+{
+	int status;
+
+	if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
+		goto out;
+
+	nfs4_lock_state();
+	status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
+	nfs4_unlock_state();
+out:
+	return status;
+}
+
+
+/* 
+ * Lock owner state (byte-range locks)
+ */
+#define LOFF_OVERFLOW(start, len)      ((u64)(len) > ~(u64)(start))
+#define LOCK_HASH_BITS              8
+#define LOCK_HASH_SIZE             (1 << LOCK_HASH_BITS)
+#define LOCK_HASH_MASK             (LOCK_HASH_SIZE - 1)
+
+#define lockownerid_hashval(id) \
+        ((id) & LOCK_HASH_MASK)
+
+static inline unsigned int
+lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
+		struct xdr_netobj *ownername)
+{
+	return (file_hashval(inode) + cl_id
+			+ opaque_hashval(ownername->data, ownername->len))
+		& LOCK_HASH_MASK;
+}
+
+static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
+static struct list_head	lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
+static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
+
+struct nfs4_stateid *
+find_stateid(stateid_t *stid, int flags)
+{
+	struct nfs4_stateid *local = NULL;
+	u32 st_id = stid->si_stateownerid;
+	u32 f_id = stid->si_fileid;
+	unsigned int hashval;
+
+	dprintk("NFSD: find_stateid flags 0x%x\n",flags);
+	if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
+		hashval = stateid_hashval(st_id, f_id);
+		list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
+			if ((local->st_stateid.si_stateownerid == st_id) &&
+			    (local->st_stateid.si_fileid == f_id))
+				return local;
+		}
+	} 
+	if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
+		hashval = stateid_hashval(st_id, f_id);
+		list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
+			if ((local->st_stateid.si_stateownerid == st_id) &&
+			    (local->st_stateid.si_fileid == f_id))
+				return local;
+		}
+	} else
+		printk("NFSD: find_stateid: ERROR: no state flag\n");
+	return NULL;
+}
+
+static struct nfs4_delegation *
+find_delegation_stateid(struct inode *ino, stateid_t *stid)
+{
+	struct nfs4_delegation *dp = NULL;
+	struct nfs4_file *fp = NULL;
+	u32 st_id;
+
+	dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
+                    stid->si_boot, stid->si_stateownerid,
+                    stid->si_fileid, stid->si_generation);
+
+	st_id = stid->si_stateownerid;
+	fp = find_file(ino);
+	if (fp) {
+		list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
+			if(dp->dl_stateid.si_stateownerid == st_id) {
+				dprintk("NFSD: find_delegation dp %p\n",dp);
+				return dp;
+			}
+		}
+	}
+	return NULL;
+}
+
+/*
+ * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
+ * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
+ * byte, because of sign extension problems.  Since NFSv4 calls for 64-bit
+ * locking, this prevents us from being completely protocol-compliant.  The
+ * real solution to this problem is to start using unsigned file offsets in
+ * the VFS, but this is a very deep change!
+ */
+static inline void
+nfs4_transform_lock_offset(struct file_lock *lock)
+{
+	if (lock->fl_start < 0)
+		lock->fl_start = OFFSET_MAX;
+	if (lock->fl_end < 0)
+		lock->fl_end = OFFSET_MAX;
+}
+
+int
+nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
+{
+	struct nfs4_stateowner *local = NULL;
+	int status = 0;
+			        
+	if (hashval >= LOCK_HASH_SIZE)
+		goto out;
+	list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
+		if (local == sop) {
+			status = 1;
+			goto out;
+		}
+	}
+out:
+	return status;
+}
+
+
+static inline void
+nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
+{
+	struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
+	unsigned int hval = lockownerid_hashval(sop->so_id);
+
+	deny->ld_sop = NULL;
+	if (nfs4_verify_lock_stateowner(sop, hval)) {
+		kref_get(&sop->so_ref);
+		deny->ld_sop = sop;
+		deny->ld_clientid = sop->so_client->cl_clientid;
+	}
+	deny->ld_start = fl->fl_start;
+	deny->ld_length = ~(u64)0;
+	if (fl->fl_end != ~(u64)0)
+		deny->ld_length = fl->fl_end - fl->fl_start + 1;        
+	deny->ld_type = NFS4_READ_LT;
+	if (fl->fl_type != F_RDLCK)
+		deny->ld_type = NFS4_WRITE_LT;
+}
+
+static struct nfs4_stateowner *
+find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
+{
+	struct nfs4_stateowner *local = NULL;
+	int i;
+
+	for (i = 0; i < LOCK_HASH_SIZE; i++) {
+		list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
+			if (!cmp_owner_str(local, owner, clid))
+				continue;
+			return local;
+		}
+	}
+	return NULL;
+}
+
+static struct nfs4_stateowner *
+find_lockstateowner_str(struct inode *inode, clientid_t *clid,
+		struct xdr_netobj *owner)
+{
+	unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
+	struct nfs4_stateowner *op;
+
+	list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
+		if (cmp_owner_str(op, owner, clid))
+			return op;
+	}
+	return NULL;
+}
+
+/*
+ * Alloc a lock owner structure.
+ * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has 
+ * occured. 
+ *
+ * strhashval = lock_ownerstr_hashval 
+ * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode 
+ */
+
+static struct nfs4_stateowner *
+alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
+	struct nfs4_stateowner *sop;
+	struct nfs4_replay *rp;
+	unsigned int idhashval;
+
+	if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
+		return NULL;
+	idhashval = lockownerid_hashval(current_ownerid);
+	INIT_LIST_HEAD(&sop->so_idhash);
+	INIT_LIST_HEAD(&sop->so_strhash);
+	INIT_LIST_HEAD(&sop->so_perclient);
+	INIT_LIST_HEAD(&sop->so_perfilestate);
+	INIT_LIST_HEAD(&sop->so_perlockowner);
+	INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
+	sop->so_time = 0;
+	list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
+	list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
+	list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
+	sop->so_is_open_owner = 0;
+	sop->so_id = current_ownerid++;
+	sop->so_client = clp;
+	sop->so_seqid = lock->lk_new_lock_seqid - 1;
+	sop->so_confirmed = 1;
+	rp = &sop->so_replay;
+	rp->rp_status = NFSERR_SERVERFAULT;
+	rp->rp_buflen = 0;
+	rp->rp_buf = rp->rp_ibuf;
+	return sop;
+}
+
+struct nfs4_stateid *
+alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
+{
+	struct nfs4_stateid *stp;
+	unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
+
+	if ((stp = kmalloc(sizeof(struct nfs4_stateid), 
+					GFP_KERNEL)) == NULL)
+		goto out;
+	INIT_LIST_HEAD(&stp->st_hash);
+	INIT_LIST_HEAD(&stp->st_perfile);
+	INIT_LIST_HEAD(&stp->st_perfilestate);
+	INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
+	list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
+	list_add(&stp->st_perfile, &fp->fi_perfile);
+	list_add_perfile++;
+	list_add(&stp->st_perfilestate, &sop->so_perfilestate);
+	stp->st_stateowner = sop;
+	stp->st_file = fp;
+	stp->st_stateid.si_boot = boot_time;
+	stp->st_stateid.si_stateownerid = sop->so_id;
+	stp->st_stateid.si_fileid = fp->fi_id;
+	stp->st_stateid.si_generation = 0;
+	stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
+	stp->st_access_bmap = open_stp->st_access_bmap;
+	stp->st_deny_bmap = open_stp->st_deny_bmap;
+
+out:
+	return stp;
+}
+
+int
+check_lock_length(u64 offset, u64 length)
+{
+	return ((length == 0)  || ((length != ~(u64)0) &&
+	     LOFF_OVERFLOW(offset, length)));
+}
+
+/*
+ *  LOCK operation 
+ */
+int
+nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
+{
+	struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
+	struct nfs4_stateid *lock_stp;
+	struct file *filp;
+	struct file_lock file_lock;
+	struct file_lock *conflock;
+	int status = 0;
+	unsigned int strhashval;
+
+	dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
+		(long long) lock->lk_offset,
+		(long long) lock->lk_length);
+
+	if (nfs4_in_grace() && !lock->lk_reclaim)
+		return nfserr_grace;
+	if (!nfs4_in_grace() && lock->lk_reclaim)
+		return nfserr_no_grace;
+
+	if (check_lock_length(lock->lk_offset, lock->lk_length))
+		 return nfserr_inval;
+
+	nfs4_lock_state();
+
+	if (lock->lk_is_new) {
+	/*
+	 * Client indicates that this is a new lockowner.
+	 * Use open owner and open stateid to create lock owner and lock 
+	 * stateid.
+	 */
+		struct nfs4_stateid *open_stp = NULL;
+		struct nfs4_file *fp;
+		
+		status = nfserr_stale_clientid;
+		if (STALE_CLIENTID(&lock->lk_new_clientid)) {
+			printk("NFSD: nfsd4_lock: clientid is stale!\n");
+			goto out;
+		}
+
+		/* is the new lock seqid presented by the client zero? */
+		status = nfserr_bad_seqid;
+		if (lock->v.new.lock_seqid != 0)
+			goto out;
+
+		/* validate and update open stateid and open seqid */
+		status = nfs4_preprocess_seqid_op(current_fh, 
+				        lock->lk_new_open_seqid,
+		                        &lock->lk_new_open_stateid,
+		                        CHECK_FH | OPEN_STATE,
+		                        &open_sop, &open_stp,
+					&lock->v.new.clientid);
+		if (status) {
+			if (lock->lk_reclaim)
+				status = nfserr_reclaim_bad;
+			goto out;
+		}
+		/* create lockowner and lock stateid */
+		fp = open_stp->st_file;
+		strhashval = lock_ownerstr_hashval(fp->fi_inode, 
+				open_sop->so_client->cl_clientid.cl_id, 
+				&lock->v.new.owner);
+		/* 
+		 * If we already have this lock owner, the client is in 
+		 * error (or our bookeeping is wrong!) 
+		 * for asking for a 'new lock'.
+		 */
+		status = nfserr_bad_stateid;
+		lock_sop = find_lockstateowner(&lock->v.new.owner,
+						&lock->v.new.clientid);
+		if (lock_sop)
+			goto out;
+		status = nfserr_resource;
+		if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
+			goto out;
+		if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner, 
+						fp, open_stp)) == NULL) {
+			release_stateowner(lock->lk_stateowner);
+			lock->lk_stateowner = NULL;
+			goto out;
+		}
+		/* bump the open seqid used to create the lock */
+		open_sop->so_seqid++;
+	} else {
+		/* lock (lock owner + lock stateid) already exists */
+		status = nfs4_preprocess_seqid_op(current_fh,
+				       lock->lk_old_lock_seqid, 
+				       &lock->lk_old_lock_stateid, 
+				       CHECK_FH | LOCK_STATE, 
+				       &lock->lk_stateowner, &lock_stp, NULL);
+		if (status)
+			goto out;
+	}
+	/* lock->lk_stateowner and lock_stp have been created or found */
+	filp = lock_stp->st_vfs_file;
+
+	if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
+		printk("NFSD: nfsd4_lock: permission denied!\n");
+		goto out;
+	}
+
+	locks_init_lock(&file_lock);
+	switch (lock->lk_type) {
+		case NFS4_READ_LT:
+		case NFS4_READW_LT:
+			file_lock.fl_type = F_RDLCK;
+		break;
+		case NFS4_WRITE_LT:
+		case NFS4_WRITEW_LT:
+			file_lock.fl_type = F_WRLCK;
+		break;
+		default:
+			status = nfserr_inval;
+		goto out;
+	}
+	file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
+	file_lock.fl_pid = current->tgid;
+	file_lock.fl_file = filp;
+	file_lock.fl_flags = FL_POSIX;
+
+	file_lock.fl_start = lock->lk_offset;
+	if ((lock->lk_length == ~(u64)0) || 
+			LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
+		file_lock.fl_end = ~(u64)0;
+	else
+		file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
+	nfs4_transform_lock_offset(&file_lock);
+
+	/*
+	* Try to lock the file in the VFS.
+	* Note: locks.c uses the BKL to protect the inode's lock list.
+	*/
+
+	status = posix_lock_file(filp, &file_lock);
+	if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
+		file_lock.fl_ops->fl_release_private(&file_lock);
+	dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
+	switch (-status) {
+	case 0: /* success! */
+		update_stateid(&lock_stp->st_stateid);
+		memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, 
+				sizeof(stateid_t));
+		goto out;
+	case (EAGAIN):
+		goto conflicting_lock;
+	case (EDEADLK):
+		status = nfserr_deadlock;
+	default:        
+		dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
+		goto out_destroy_new_stateid;
+	}
+
+conflicting_lock:
+	dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
+	status = nfserr_denied;
+	/* XXX There is a race here. Future patch needed to provide 
+	 * an atomic posix_lock_and_test_file
+	 */
+	if (!(conflock = posix_test_lock(filp, &file_lock))) {
+		status = nfserr_serverfault;
+		goto out;
+	}
+	nfs4_set_lock_denied(conflock, &lock->lk_denied);
+
+out_destroy_new_stateid:
+	if (lock->lk_is_new) {
+		dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
+	/*
+	* An error encountered after instantiation of the new
+	* stateid has forced us to destroy it.
+	*/
+		if (!seqid_mutating_err(status))
+			open_sop->so_seqid--;
+
+		release_state_owner(lock_stp, LOCK_STATE);
+	}
+out:
+	if (lock->lk_stateowner)
+		nfs4_get_stateowner(lock->lk_stateowner);
+	nfs4_unlock_state();
+	return status;
+}
+
+/*
+ * LOCKT operation
+ */
+int
+nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
+{
+	struct inode *inode;
+	struct file file;
+	struct file_lock file_lock;
+	struct file_lock *conflicting_lock;
+	int status;
+
+	if (nfs4_in_grace())
+		return nfserr_grace;
+
+	if (check_lock_length(lockt->lt_offset, lockt->lt_length))
+		 return nfserr_inval;
+
+	lockt->lt_stateowner = NULL;
+	nfs4_lock_state();
+
+	status = nfserr_stale_clientid;
+	if (STALE_CLIENTID(&lockt->lt_clientid)) {
+		printk("NFSD: nfsd4_lockt: clientid is stale!\n");
+		goto out;
+	}
+
+	if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
+		printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
+		if (status == nfserr_symlink)
+			status = nfserr_inval;
+		goto out;
+	}
+
+	inode = current_fh->fh_dentry->d_inode;
+	locks_init_lock(&file_lock);
+	switch (lockt->lt_type) {
+		case NFS4_READ_LT:
+		case NFS4_READW_LT:
+			file_lock.fl_type = F_RDLCK;
+		break;
+		case NFS4_WRITE_LT:
+		case NFS4_WRITEW_LT:
+			file_lock.fl_type = F_WRLCK;
+		break;
+		default:
+			printk("NFSD: nfs4_lockt: bad lock type!\n");
+			status = nfserr_inval;
+		goto out;
+	}
+
+	lockt->lt_stateowner = find_lockstateowner_str(inode,
+			&lockt->lt_clientid, &lockt->lt_owner);
+	if (lockt->lt_stateowner)
+		file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
+	file_lock.fl_pid = current->tgid;
+	file_lock.fl_flags = FL_POSIX;
+
+	file_lock.fl_start = lockt->lt_offset;
+	if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
+		file_lock.fl_end = ~(u64)0;
+	else
+		file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
+
+	nfs4_transform_lock_offset(&file_lock);
+
+	/* posix_test_lock uses the struct file _only_ to resolve the inode.
+	 * since LOCKT doesn't require an OPEN, and therefore a struct
+	 * file may not exist, pass posix_test_lock a struct file with
+	 * only the dentry:inode set.
+	 */
+	memset(&file, 0, sizeof (struct file));
+	file.f_dentry = current_fh->fh_dentry;
+
+	status = nfs_ok;
+	conflicting_lock = posix_test_lock(&file, &file_lock);
+	if (conflicting_lock) {
+		status = nfserr_denied;
+		nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
+	}
+out:
+	nfs4_unlock_state();
+	return status;
+}
+
+int
+nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
+{
+	struct nfs4_stateid *stp;
+	struct file *filp = NULL;
+	struct file_lock file_lock;
+	int status;
+						        
+	dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
+		(long long) locku->lu_offset,
+		(long long) locku->lu_length);
+
+	if (check_lock_length(locku->lu_offset, locku->lu_length))
+		 return nfserr_inval;
+
+	nfs4_lock_state();
+									        
+	if ((status = nfs4_preprocess_seqid_op(current_fh, 
+					locku->lu_seqid, 
+					&locku->lu_stateid, 
+					CHECK_FH | LOCK_STATE, 
+					&locku->lu_stateowner, &stp, NULL)))
+		goto out;
+
+	filp = stp->st_vfs_file;
+	BUG_ON(!filp);
+	locks_init_lock(&file_lock);
+	file_lock.fl_type = F_UNLCK;
+	file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
+	file_lock.fl_pid = current->tgid;
+	file_lock.fl_file = filp;
+	file_lock.fl_flags = FL_POSIX; 
+	file_lock.fl_start = locku->lu_offset;
+
+	if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
+		file_lock.fl_end = ~(u64)0;
+	else
+		file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
+	nfs4_transform_lock_offset(&file_lock);
+
+	/*
+	*  Try to unlock the file in the VFS.
+	*/
+	status = posix_lock_file(filp, &file_lock); 
+	if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
+		file_lock.fl_ops->fl_release_private(&file_lock);
+	if (status) {
+		printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
+		goto out_nfserr;
+	}
+	/*
+	* OK, unlock succeeded; the only thing left to do is update the stateid.
+	*/
+	update_stateid(&stp->st_stateid);
+	memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
+
+out:
+	if (locku->lu_stateowner)
+		nfs4_get_stateowner(locku->lu_stateowner);
+	nfs4_unlock_state();
+	return status;
+
+out_nfserr:
+	status = nfserrno(status);
+	goto out;
+}
+
+/*
+ * returns
+ * 	1: locks held by lockowner
+ * 	0: no locks held by lockowner
+ */
+static int
+check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
+{
+	struct file_lock **flpp;
+	struct inode *inode = filp->f_dentry->d_inode;
+	int status = 0;
+
+	lock_kernel();
+	for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
+		if ((*flpp)->fl_owner == (fl_owner_t)lowner)
+			status = 1;
+			goto out;
+	}
+out:
+	unlock_kernel();
+	return status;
+}
+
+int
+nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
+{
+	clientid_t *clid = &rlockowner->rl_clientid;
+	struct nfs4_stateowner *local = NULL;
+	struct xdr_netobj *owner = &rlockowner->rl_owner;
+	int status;
+
+	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
+		clid->cl_boot, clid->cl_id);
+
+	/* XXX check for lease expiration */
+
+	status = nfserr_stale_clientid;
+	if (STALE_CLIENTID(clid)) {
+		printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
+		return status;
+	}
+
+	nfs4_lock_state();
+
+	status = nfs_ok;
+	local = find_lockstateowner(owner, clid);
+	if (local) {
+		struct nfs4_stateid *stp;
+
+		/* check for any locks held by any stateid
+		 * associated with the (lock) stateowner */
+		status = nfserr_locks_held;
+		list_for_each_entry(stp, &local->so_perfilestate,
+				st_perfilestate) {
+			if (check_for_locks(stp->st_vfs_file, local))
+				goto out;
+		}
+		/* no locks held by (lock) stateowner */
+		status = nfs_ok;
+		release_stateowner(local);
+	}
+out:
+	nfs4_unlock_state();
+	return status;
+}
+
+static inline struct nfs4_client_reclaim *
+alloc_reclaim(int namelen)
+{
+	struct nfs4_client_reclaim *crp = NULL;
+
+	crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
+	if (!crp)
+		return NULL;
+	crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
+	if (!crp->cr_name.data) {
+		kfree(crp);
+		return NULL;
+	}
+	return crp;
+}
+
+/*
+ * failure => all reset bets are off, nfserr_no_grace...
+ */
+static int
+nfs4_client_to_reclaim(char *name, int namlen)
+{
+	unsigned int strhashval;
+	struct nfs4_client_reclaim *crp = NULL;
+
+	dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
+	crp = alloc_reclaim(namlen);
+	if (!crp)
+		return 0;
+	strhashval = clientstr_hashval(name, namlen);
+	INIT_LIST_HEAD(&crp->cr_strhash);
+	list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
+	memcpy(crp->cr_name.data, name, namlen);
+	crp->cr_name.len = namlen;
+	reclaim_str_hashtbl_size++;
+	return 1;
+}
+
+static void
+nfs4_release_reclaim(void)
+{
+	struct nfs4_client_reclaim *crp = NULL;
+	int i;
+
+	BUG_ON(!nfs4_reclaim_init);
+	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+		while (!list_empty(&reclaim_str_hashtbl[i])) {
+			crp = list_entry(reclaim_str_hashtbl[i].next,
+			                struct nfs4_client_reclaim, cr_strhash);
+			list_del(&crp->cr_strhash);
+			kfree(crp->cr_name.data);
+			kfree(crp);
+			reclaim_str_hashtbl_size--;
+		}
+	}
+	BUG_ON(reclaim_str_hashtbl_size);
+}
+
+/*
+ * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
+struct nfs4_client_reclaim *
+nfs4_find_reclaim_client(clientid_t *clid)
+{
+	unsigned int strhashval;
+	struct nfs4_client *clp;
+	struct nfs4_client_reclaim *crp = NULL;
+
+
+	/* find clientid in conf_id_hashtbl */
+	clp = find_confirmed_client(clid);
+	if (clp == NULL)
+		return NULL;
+
+	dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
+		            clp->cl_name.len, clp->cl_name.data);
+
+	/* find clp->cl_name in reclaim_str_hashtbl */
+	strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
+	list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
+		if (cmp_name(&crp->cr_name, &clp->cl_name)) {
+			return crp;
+		}
+	}
+	return NULL;
+}
+
+/*
+* Called from OPEN. Look for clientid in reclaim list.
+*/
+int
+nfs4_check_open_reclaim(clientid_t *clid)
+{
+	struct nfs4_client_reclaim *crp;
+
+	if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
+		return nfserr_reclaim_bad;
+	return nfs_ok;
+}
+
+
+/* 
+ * Start and stop routines
+ */
+
+static void
+__nfs4_state_init(void)
+{
+	int i;
+	time_t grace_time;
+
+	if (!nfs4_reclaim_init) {
+		for (i = 0; i < CLIENT_HASH_SIZE; i++)
+			INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
+		reclaim_str_hashtbl_size = 0;
+		nfs4_reclaim_init = 1;
+	}
+	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+		INIT_LIST_HEAD(&conf_id_hashtbl[i]);
+		INIT_LIST_HEAD(&conf_str_hashtbl[i]);
+		INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
+		INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
+	}
+	for (i = 0; i < FILE_HASH_SIZE; i++) {
+		INIT_LIST_HEAD(&file_hashtbl[i]);
+	}
+	for (i = 0; i < OWNER_HASH_SIZE; i++) {
+		INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
+		INIT_LIST_HEAD(&ownerid_hashtbl[i]);
+	}
+	for (i = 0; i < STATEID_HASH_SIZE; i++) {
+		INIT_LIST_HEAD(&stateid_hashtbl[i]);
+		INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
+	}
+	for (i = 0; i < LOCK_HASH_SIZE; i++) {
+		INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
+		INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
+	}
+	memset(&zerostateid, 0, sizeof(stateid_t));
+	memset(&onestateid, ~0, sizeof(stateid_t));
+
+	INIT_LIST_HEAD(&close_lru);
+	INIT_LIST_HEAD(&client_lru);
+	INIT_LIST_HEAD(&del_recall_lru);
+	spin_lock_init(&recall_lock);
+	boot_time = get_seconds();
+	grace_time = max(old_lease_time, lease_time);
+	if (reclaim_str_hashtbl_size == 0)
+		grace_time = 0;
+	if (grace_time)
+		printk("NFSD: starting %ld-second grace period\n", grace_time);
+	grace_end = boot_time + grace_time;
+	INIT_WORK(&laundromat_work,laundromat_main, NULL);
+	schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
+}
+
+int
+nfs4_state_init(void)
+{
+	int status;
+
+	if (nfs4_init)
+		return 0;
+	status = nfsd4_init_slabs();
+	if (status)
+		return status;
+	__nfs4_state_init();
+	nfs4_init = 1;
+	return 0;
+}
+
+int
+nfs4_in_grace(void)
+{
+	return get_seconds() < grace_end;
+}
+
+void
+set_no_grace(void)
+{
+	printk("NFSD: ERROR in reboot recovery.  State reclaims will fail.\n");
+	grace_end = get_seconds();
+}
+
+time_t
+nfs4_lease_time(void)
+{
+	return lease_time;
+}
+
+static void
+__nfs4_state_shutdown(void)
+{
+	int i;
+	struct nfs4_client *clp = NULL;
+	struct nfs4_delegation *dp = NULL;
+	struct nfs4_stateowner *sop = NULL;
+	struct list_head *pos, *next, reaplist;
+
+	list_for_each_safe(pos, next, &close_lru) {
+		sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
+		list_del(&sop->so_close_lru);
+		nfs4_put_stateowner(sop);
+	}
+
+	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+		while (!list_empty(&conf_id_hashtbl[i])) {
+			clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
+			expire_client(clp);
+		}
+		while (!list_empty(&unconf_str_hashtbl[i])) {
+			clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
+			expire_client(clp);
+		}
+	}
+	INIT_LIST_HEAD(&reaplist);
+	spin_lock(&recall_lock);
+	list_for_each_safe(pos, next, &del_recall_lru) {
+		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+		list_move(&dp->dl_recall_lru, &reaplist);
+	}
+	spin_unlock(&recall_lock);
+	list_for_each_safe(pos, next, &reaplist) {
+		dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
+		list_del_init(&dp->dl_recall_lru);
+		unhash_delegation(dp);
+	}
+
+	release_all_files();
+	cancel_delayed_work(&laundromat_work);
+	flush_scheduled_work();
+	nfs4_init = 0;
+	dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
+			list_add_perfile, list_del_perfile);
+	dprintk("NFSD: add_perclient %d del_perclient %d\n",
+			add_perclient, del_perclient);
+	dprintk("NFSD: alloc_file %d free_file %d\n",
+			alloc_file, free_file);
+	dprintk("NFSD: vfsopen %d vfsclose %d\n",
+			vfsopen, vfsclose);
+	dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
+			alloc_delegation, free_delegation);
+
+}
+
+void
+nfs4_state_shutdown(void)
+{
+	nfs4_lock_state();
+	nfs4_release_reclaim();
+	__nfs4_state_shutdown();
+	nfsd4_free_slabs();
+	nfs4_unlock_state();
+}
+
+/*
+ * Called when leasetime is changed.
+ *
+ * if nfsd is not started, simply set the global lease.
+ *
+ * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
+ * e.g: boot_time is reset, existing nfs4_client structs are
+ * used to fill reclaim_str_hashtbl, then all state (except for the
+ * reclaim_str_hashtbl) is re-initialized.
+ *
+ * if the old lease time is greater than the new lease time, the grace
+ * period needs to be set to the old lease time to allow clients to reclaim
+ * their state. XXX - we may want to set the grace period == lease time
+ * after an initial grace period == old lease time
+ *
+ * if an error occurs in this process, the new lease is set, but the server
+ * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
+ * which means OPEN/LOCK/READ/WRITE will fail during grace period.
+ *
+ * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
+ * OPEN and LOCK reclaims.
+ */
+void
+nfs4_reset_lease(time_t leasetime)
+{
+	struct nfs4_client *clp;
+	int i;
+
+	printk("NFSD: New leasetime %ld\n",leasetime);
+	if (!nfs4_init)
+		return;
+	nfs4_lock_state();
+	old_lease_time = lease_time;
+	lease_time = leasetime;
+
+	nfs4_release_reclaim();
+
+	/* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
+	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
+		list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
+			if (!nfs4_client_to_reclaim(clp->cl_name.data,
+						clp->cl_name.len)) {
+				nfs4_release_reclaim();
+				goto init_state;
+			}
+		}
+	}
+init_state:
+	__nfs4_state_shutdown();
+	__nfs4_state_init();
+	nfs4_unlock_state();
+}
+