[net-next-2.6.git] / include / linux / nfsd / state.h

/*
 *  linux/include/nfsd/state.h
 *
 *  Copyright (c) 2001 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson <andros@umich.edu>
 *  
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef _NFSD4_STATE_H
#define _NFSD4_STATE_H

#include <linux/list.h>
#include <linux/kref.h>
#include <linux/sunrpc/clnt.h>

#define NFS4_OPAQUE_LIMIT 1024
typedef struct {
	u32             cl_boot;
	u32             cl_id;
} clientid_t;

typedef struct {
	u32             so_boot;
	u32             so_stateownerid;
	u32             so_fileid;
} stateid_opaque_t;

typedef struct {
	u32                     si_generation;
	stateid_opaque_t        si_opaque;
} stateid_t;
#define si_boot           si_opaque.so_boot
#define si_stateownerid   si_opaque.so_stateownerid
#define si_fileid         si_opaque.so_fileid

extern stateid_t zerostateid;
extern stateid_t onestateid;

#define ZERO_STATEID(stateid)       (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
#define ONE_STATEID(stateid)        (!memcmp((stateid), &onestateid, sizeof(stateid_t)))

struct nfs4_cb_recall {
	u32			cbr_ident;
	int			cbr_trunc;
	stateid_t		cbr_stateid;
	u32			cbr_fhlen;
	u32			cbr_fhval[NFS4_FHSIZE];
	struct nfs4_delegation	*cbr_dp;
};

struct nfs4_delegation {
	struct list_head	dl_del_perfile; /* nfs4_file->fi_del_perfile */
	struct list_head	dl_del_perclnt; /* nfs4_client->cl_del_perclnt*/
	struct list_head	dl_recall_lru;  /* delegation recalled */
	atomic_t		dl_count;       /* ref count */
	struct nfs4_client	*dl_client;
	struct nfs4_file	*dl_file;
	struct file_lock	*dl_flock;
	struct file		*dl_vfs_file;
	u32			dl_type;
	time_t			dl_time;
	struct nfs4_cb_recall	dl_recall;
};

#define dl_stateid      dl_recall.cbr_stateid
#define dl_fhlen        dl_recall.cbr_fhlen
#define dl_fhval        dl_recall.cbr_fhval

/* client delegation callback info */
struct nfs4_callback {
	/* SETCLIENTID info */
	u32			cb_parsed;  /* addr parsed */
	u32                     cb_addr;
	unsigned short          cb_port;
	u32                     cb_prog;
	u32                     cb_ident;
	/* RPC client info */
	atomic_t		cb_set;     /* successful CB_NULL call */
	struct rpc_program      cb_program;
	struct rpc_stat         cb_stat;
	struct rpc_clnt *       cb_client;
};

/*
 * struct nfs4_client - one per client.  Clientids live here.
 * 	o Each nfs4_client is hashed by clientid.
 *
 * 	o Each nfs4_clients is also hashed by name 
 * 	  (the opaque quantity initially sent by the client to identify itself).
 * 	  
 *	o cl_perclient list is used to ensure no dangling stateowner references
 *	  when we expire the nfs4_client
 */
struct nfs4_client {
	struct list_head	cl_idhash; 	/* hash by cl_clientid.id */
	struct list_head	cl_strhash; 	/* hash by cl_name */
	struct list_head	cl_perclient; 	/* list: stateowners */
	struct list_head	cl_del_perclnt; /* list: delegations */
	struct list_head        cl_lru;         /* tail queue */
	struct xdr_netobj	cl_name; 	/* id generated by client */
	nfs4_verifier		cl_verifier; 	/* generated by client */
	time_t                  cl_time;        /* time of last lease renewal */
	u32			cl_addr; 	/* client ipaddress */
	struct svc_cred		cl_cred; 	/* setclientid principal */
	clientid_t		cl_clientid;	/* generated by server */
	nfs4_verifier		cl_confirm;	/* generated by server */
	struct nfs4_callback	cl_callback;    /* callback info */
	atomic_t		cl_count;	/* ref count */
};

/* struct nfs4_client_reset
 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
 * upon lease reset, or from upcall to state_daemon (to read in state
 * from non-volitile storage) upon reboot.
 */
struct nfs4_client_reclaim {
	struct list_head	cr_strhash;	/* hash by cr_name */
	struct xdr_netobj 	cr_name; 	/* id generated by client */
};

static inline void
update_stateid(stateid_t *stateid)
{
	stateid->si_generation++;
}

/* A reasonable value for REPLAY_ISIZE was estimated as follows:  
 * The OPEN response, typically the largest, requires 
 *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) + 
 *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) + 
 *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes 
 */

#define NFSD4_REPLAY_ISIZE       112 

/*
 * Replay buffer, where the result of the last seqid-mutating operation 
 * is cached. 
 */
struct nfs4_replay {
	u32			rp_status;
	unsigned int		rp_buflen;
	char			*rp_buf;
	unsigned		intrp_allocated;
	int			rp_openfh_len;
	char			rp_openfh[NFS4_FHSIZE];
	char			rp_ibuf[NFSD4_REPLAY_ISIZE];
};

/*
* nfs4_stateowner can either be an open_owner, or a lock_owner
*
*    so_idhash:  stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
*         for lock_owner
*    so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
*         for lock_owner
*    so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
*         struct is reaped.
*    so_perfilestate: heads the list of nfs4_stateid (either open or lock) 
*         and is used to ensure no dangling nfs4_stateid references when we 
*         release a stateowner.
*    so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
*         close is called to reap associated byte-range locks
*    so_close_lru: (open) stateowner is placed on this list instead of being
*         reaped (when so_perfilestate is empty) to hold the last close replay.
*         reaped by laundramat thread after lease period.
*/
struct nfs4_stateowner {
	struct kref		so_ref;
	struct list_head        so_idhash;   /* hash by so_id */
	struct list_head        so_strhash;   /* hash by op_name */
	struct list_head        so_perclient; /* nfs4_client->cl_perclient */
	struct list_head        so_perfilestate; /* list: nfs4_stateid */
	struct list_head        so_perlockowner; /* nfs4_stateid->st_perlockowner */
	struct list_head	so_close_lru; /* tail queue */
	time_t			so_time; /* time of placement on so_close_lru */
	int			so_is_open_owner; /* 1=openowner,0=lockowner */
	u32                     so_id;
	struct nfs4_client *    so_client;
	u32                     so_seqid;    
	struct xdr_netobj       so_owner;     /* open owner name */
	int                     so_confirmed; /* successful OPEN_CONFIRM? */
	struct nfs4_replay	so_replay;
};

/*
*  nfs4_file: a file opened by some number of (open) nfs4_stateowners.
*    o fi_perfile list is used to search for conflicting 
*      share_acces, share_deny on the file.
*/
struct nfs4_file {
	struct kref		fi_ref;
	struct list_head        fi_hash;    /* hash by "struct inode *" */
	struct list_head        fi_stateids;
	struct list_head	fi_delegations;
	struct inode		*fi_inode;
	u32                     fi_id;      /* used with stateowner->so_id 
					     * for stateid_hashtbl hash */
};

/*
* nfs4_stateid can either be an open stateid or (eventually) a lock stateid
*
* (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
*
* 	st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
* 	st_perfile: file_hashtbl[] entry.
* 	st_perfile_state: nfs4_stateowner->so_perfilestate
*       st_perlockowner: (open stateid) list of lock nfs4_stateowners
* 	st_access_bmap: used only for open stateid
* 	st_deny_bmap: used only for open stateid
*/

struct nfs4_stateid {
	struct list_head              st_hash; 
	struct list_head              st_perfile;
	struct list_head              st_perfilestate; 
	struct list_head              st_perlockowner;
	struct nfs4_stateowner      * st_stateowner;
	struct nfs4_file            * st_file;
	stateid_t                     st_stateid;
	struct file                 * st_vfs_file;
	unsigned long                 st_access_bmap;
	unsigned long                 st_deny_bmap;
};

/* flags for preprocess_seqid_op() */
#define CHECK_FH                0x00000001
#define CONFIRM                 0x00000002
#define OPEN_STATE              0x00000004
#define LOCK_STATE              0x00000008
#define RD_STATE	        0x00000010
#define WR_STATE	        0x00000020
#define CLOSE_STATE             0x00000040
#define DELEG_RET               0x00000080

#define seqid_mutating_err(err)                       \
	(((err) != nfserr_stale_clientid) &&    \
	((err) != nfserr_bad_seqid) &&          \
	((err) != nfserr_stale_stateid) &&      \
	((err) != nfserr_bad_stateid))

extern time_t nfs4_laundromat(void);
extern int nfsd4_renew(clientid_t *clid);
extern int nfs4_preprocess_stateid_op(struct svc_fh *current_fh, 
		stateid_t *stateid, int flags, struct file **filp);
extern int nfs4_share_conflict(struct svc_fh *current_fh, 
		unsigned int deny_type);
extern void nfs4_lock_state(void);
extern void nfs4_unlock_state(void);
extern int nfs4_in_grace(void);
extern int nfs4_check_open_reclaim(clientid_t *clid);
extern void put_nfs4_client(struct nfs4_client *clp);
extern void nfs4_free_stateowner(struct kref *kref);
extern void nfsd4_probe_callback(struct nfs4_client *clp);
extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
extern void nfs4_put_delegation(struct nfs4_delegation *dp);

static inline void
nfs4_put_stateowner(struct nfs4_stateowner *so)
{
	kref_put(&so->so_ref, nfs4_free_stateowner);
}

static inline void
nfs4_get_stateowner(struct nfs4_stateowner *so)
{
	kref_get(&so->so_ref);
}

#endif   /* NFSD4_STATE_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/nfsd/state.h
	3	*
	4	* Copyright (c) 2001 The Regents of the University of Michigan.
	5	* All rights reserved.
	6	*
	7	* Kendrick Smith <kmsmith@umich.edu>
	8	* Andy Adamson <andros@umich.edu>
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	*
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
	19	* 3. Neither the name of the University nor the names of its
	20	* contributors may be used to endorse or promote products derived
	21	* from this software without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	26	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	28	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	29	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	30	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	31	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	32	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	33	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	34	*
	35	*/
	36
	37	#ifndef _NFSD4_STATE_H
	38	#define _NFSD4_STATE_H
	39
	40	#include <linux/list.h>
	41	#include <linux/kref.h>
	42	#include <linux/sunrpc/clnt.h>
	43
	44	#define NFS4_OPAQUE_LIMIT 1024
	45	typedef struct {
	46	u32 cl_boot;
	47	u32 cl_id;
	48	} clientid_t;
	49
	50	typedef struct {
	51	u32 so_boot;
	52	u32 so_stateownerid;
	53	u32 so_fileid;
	54	} stateid_opaque_t;
	55
	56	typedef struct {
	57	u32 si_generation;
	58	stateid_opaque_t si_opaque;
	59	} stateid_t;
	60	#define si_boot si_opaque.so_boot
	61	#define si_stateownerid si_opaque.so_stateownerid
	62	#define si_fileid si_opaque.so_fileid
	63
	64	extern stateid_t zerostateid;
65	extern stateid_t onestateid;
66
67	#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
68	#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
69
70	struct nfs4_cb_recall {
71	u32 cbr_ident;
72	int cbr_trunc;
73	stateid_t cbr_stateid;
74	u32 cbr_fhlen;
75	u32 cbr_fhval[NFS4_FHSIZE];
76	struct nfs4_delegation *cbr_dp;
77	};
78
79	struct nfs4_delegation {
80	struct list_head dl_del_perfile; /* nfs4_file->fi_del_perfile */
81	struct list_head dl_del_perclnt; /* nfs4_client->cl_del_perclnt*/
82	struct list_head dl_recall_lru; /* delegation recalled */
83	atomic_t dl_count; /* ref count */
84	struct nfs4_client *dl_client;
85	struct nfs4_file *dl_file;
86	struct file_lock *dl_flock;
87	struct file *dl_vfs_file;
88	u32 dl_type;
89	time_t dl_time;
90	struct nfs4_cb_recall dl_recall;
91	};
92
93	#define dl_stateid dl_recall.cbr_stateid
94	#define dl_fhlen dl_recall.cbr_fhlen
95	#define dl_fhval dl_recall.cbr_fhval
96
97	/* client delegation callback info */
98	struct nfs4_callback {
99	/* SETCLIENTID info */
100	u32 cb_parsed; /* addr parsed */
101	u32 cb_addr;
102	unsigned short cb_port;
103	u32 cb_prog;
104	u32 cb_ident;
105	/* RPC client info */
106	atomic_t cb_set; /* successful CB_NULL call */
107	struct rpc_program cb_program;
108	struct rpc_stat cb_stat;
109	struct rpc_clnt * cb_client;
110	};
111
112	/*
113	* struct nfs4_client - one per client. Clientids live here.
114	* o Each nfs4_client is hashed by clientid.
115	*
116	* o Each nfs4_clients is also hashed by name
117	* (the opaque quantity initially sent by the client to identify itself).
118	*
119	* o cl_perclient list is used to ensure no dangling stateowner references
120	* when we expire the nfs4_client
121	*/
122	struct nfs4_client {
123	struct list_head cl_idhash; /* hash by cl_clientid.id */
124	struct list_head cl_strhash; /* hash by cl_name */
125	struct list_head cl_perclient; /* list: stateowners */
126	struct list_head cl_del_perclnt; /* list: delegations */
127	struct list_head cl_lru; /* tail queue */
128	struct xdr_netobj cl_name; /* id generated by client */
129	nfs4_verifier cl_verifier; /* generated by client */
130	time_t cl_time; /* time of last lease renewal */
131	u32 cl_addr; /* client ipaddress */
132	struct svc_cred cl_cred; /* setclientid principal */
133	clientid_t cl_clientid; /* generated by server */
134	nfs4_verifier cl_confirm; /* generated by server */
135	struct nfs4_callback cl_callback; /* callback info */
136	atomic_t cl_count; /* ref count */
137	};
138
139	/* struct nfs4_client_reset
140	* one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
141	* upon lease reset, or from upcall to state_daemon (to read in state
142	* from non-volitile storage) upon reboot.
143	*/
144	struct nfs4_client_reclaim {
145	struct list_head cr_strhash; /* hash by cr_name */
146	struct xdr_netobj cr_name; /* id generated by client */
147	};
148
149	static inline void
150	update_stateid(stateid_t *stateid)
151	{
152	stateid->si_generation++;
153	}
154
155	/* A reasonable value for REPLAY_ISIZE was estimated as follows:
156	* The OPEN response, typically the largest, requires
157	* 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
158	* 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
159	* 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
160	*/
161
162	#define NFSD4_REPLAY_ISIZE 112
163
164	/*
165	* Replay buffer, where the result of the last seqid-mutating operation
166	* is cached.
167	*/
168	struct nfs4_replay {
169	u32 rp_status;
170	unsigned int rp_buflen;
171	char *rp_buf;
172	unsigned intrp_allocated;
173	int rp_openfh_len;
174	char rp_openfh[NFS4_FHSIZE];
175	char rp_ibuf[NFSD4_REPLAY_ISIZE];
176	};
177
178	/*
179	* nfs4_stateowner can either be an open_owner, or a lock_owner
180	*
181	* so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
182	* for lock_owner
183	* so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
184	* for lock_owner
185	* so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
186	* struct is reaped.
187	* so_perfilestate: heads the list of nfs4_stateid (either open or lock)
188	* and is used to ensure no dangling nfs4_stateid references when we
189	* release a stateowner.
190	* so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
191	* close is called to reap associated byte-range locks
192	* so_close_lru: (open) stateowner is placed on this list instead of being
193	* reaped (when so_perfilestate is empty) to hold the last close replay.
194	* reaped by laundramat thread after lease period.
195	*/
196	struct nfs4_stateowner {
197	struct kref so_ref;
198	struct list_head so_idhash; /* hash by so_id */
199	struct list_head so_strhash; /* hash by op_name */
200	struct list_head so_perclient; /* nfs4_client->cl_perclient */
201	struct list_head so_perfilestate; /* list: nfs4_stateid */
202	struct list_head so_perlockowner; /* nfs4_stateid->st_perlockowner */
203	struct list_head so_close_lru; /* tail queue */
204	time_t so_time; /* time of placement on so_close_lru */
205	int so_is_open_owner; /* 1=openowner,0=lockowner */
206	u32 so_id;
207	struct nfs4_client * so_client;
208	u32 so_seqid;
209	struct xdr_netobj so_owner; /* open owner name */
210	int so_confirmed; /* successful OPEN_CONFIRM? */
211	struct nfs4_replay so_replay;
212	};
213
214	/*
215	* nfs4_file: a file opened by some number of (open) nfs4_stateowners.
216	* o fi_perfile list is used to search for conflicting
217	* share_acces, share_deny on the file.
218	*/
219	struct nfs4_file {
13cd2184	220	struct kref fi_ref;
1da177e4	221	struct list_head fi_hash; /* hash by "struct inode " /
8beefa24 N	222	struct list_head fi_stateids;
8beefa24 N	223	struct list_head fi_delegations;
1da177e4 LT	224	struct inode *fi_inode;
	225	u32 fi_id; /* used with stateowner->so_id
	226	* for stateid_hashtbl hash */
	227	};
	228
	229	/*
	230	* nfs4_stateid can either be an open stateid or (eventually) a lock stateid
	231	*
	232	* (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
	233	*
	234	* st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
	235	* st_perfile: file_hashtbl[] entry.
	236	* st_perfile_state: nfs4_stateowner->so_perfilestate
	237	* st_perlockowner: (open stateid) list of lock nfs4_stateowners
	238	* st_access_bmap: used only for open stateid
	239	* st_deny_bmap: used only for open stateid
	240	*/
	241
	242	struct nfs4_stateid {
	243	struct list_head st_hash;
	244	struct list_head st_perfile;
	245	struct list_head st_perfilestate;
	246	struct list_head st_perlockowner;
	247	struct nfs4_stateowner * st_stateowner;
	248	struct nfs4_file * st_file;
	249	stateid_t st_stateid;
	250	struct file * st_vfs_file;
	251	unsigned long st_access_bmap;
	252	unsigned long st_deny_bmap;
	253	};
	254
	255	/* flags for preprocess_seqid_op() */
	256	#define CHECK_FH 0x00000001
	257	#define CONFIRM 0x00000002
	258	#define OPEN_STATE 0x00000004
	259	#define LOCK_STATE 0x00000008
	260	#define RD_STATE 0x00000010
	261	#define WR_STATE 0x00000020
	262	#define CLOSE_STATE 0x00000040
	263	#define DELEG_RET 0x00000080
	264
	265	#define seqid_mutating_err(err) \
	266	(((err) != nfserr_stale_clientid) && \
	267	((err) != nfserr_bad_seqid) && \
	268	((err) != nfserr_stale_stateid) && \
	269	((err) != nfserr_bad_stateid))
	270
	271	extern time_t nfs4_laundromat(void);
	272	extern int nfsd4_renew(clientid_t *clid);
	273	extern int nfs4_preprocess_stateid_op(struct svc_fh *current_fh,
	274	stateid_t stateid, int flags, struct file *filp);
	275	extern int nfs4_share_conflict(struct svc_fh *current_fh,
	276	unsigned int deny_type);
	277	extern void nfs4_lock_state(void);
	278	extern void nfs4_unlock_state(void);
	279	extern int nfs4_in_grace(void);
	280	extern int nfs4_check_open_reclaim(clientid_t *clid);
	281	extern void put_nfs4_client(struct nfs4_client *clp);
	282	extern void nfs4_free_stateowner(struct kref *kref);
	283	extern void nfsd4_probe_callback(struct nfs4_client *clp);
	284	extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
	285	extern void nfs4_put_delegation(struct nfs4_delegation *dp);
	286
	287	static inline void
288	nfs4_put_stateowner(struct nfs4_stateowner *so)
289	{
290	kref_put(&so->so_ref, nfs4_free_stateowner);
291	}
292
293	static inline void
294	nfs4_get_stateowner(struct nfs4_stateowner *so)
295	{
296	kref_get(&so->so_ref);
297	}
298
299	#endif /* NFSD4_STATE_H */