[deliverable/linux.git] / include / linux / lockd / lockd.h

/*
 * linux/include/linux/lockd/lockd.h
 *
 * General-purpose lockd include file.
 *
 * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef LINUX_LOCKD_LOCKD_H
#define LINUX_LOCKD_LOCKD_H

#ifdef __KERNEL__

#include <linux/in.h>
#include <linux/in6.h>
#include <net/ipv6.h>
#include <linux/fs.h>
#include <linux/kref.h>
#include <linux/utsname.h>
#include <linux/nfsd/nfsfh.h>
#include <linux/lockd/bind.h>
#include <linux/lockd/xdr.h>
#ifdef CONFIG_LOCKD_V4
#include <linux/lockd/xdr4.h>
#endif
#include <linux/lockd/debug.h>

/*
 * Version string
 */
#define LOCKD_VERSION		"0.5"

/*
 * Default timeout for RPC calls (seconds)
 */
#define LOCKD_DFLT_TIMEO	10

/*
 * Lockd host handle (used both by the client and server personality).
 */
struct nlm_host {
	struct hlist_node	h_hash;		/* doubly linked list */
	struct sockaddr_storage	h_addr;		/* peer address */
	size_t			h_addrlen;
	struct sockaddr_storage	h_srcaddr;	/* our address (optional) */
	struct rpc_clnt		*h_rpcclnt;	/* RPC client to talk to peer */
	char			*h_name;		/* remote hostname */
	u32			h_version;	/* interface version */
	unsigned short		h_proto;	/* transport proto */
	unsigned short		h_reclaiming : 1,
				h_server     : 1, /* server side, not client side */
				h_noresvport : 1,
				h_inuse      : 1;
	wait_queue_head_t	h_gracewait;	/* wait while reclaiming */
	struct rw_semaphore	h_rwsem;	/* Reboot recovery lock */
	u32			h_state;	/* pseudo-state counter */
	u32			h_nsmstate;	/* true remote NSM state */
	u32			h_pidcount;	/* Pseudopids */
	atomic_t		h_count;	/* reference count */
	struct mutex		h_mutex;	/* mutex for pmap binding */
	unsigned long		h_nextrebind;	/* next portmap call */
	unsigned long		h_expires;	/* eligible for GC */
	struct list_head	h_lockowners;	/* Lockowners for the client */
	spinlock_t		h_lock;
	struct list_head	h_granted;	/* Locks in GRANTED state */
	struct list_head	h_reclaim;	/* Locks in RECLAIM state */
	struct nsm_handle	*h_nsmhandle;	/* NSM status handle */
	char			*h_addrbuf;	/* address eyecatcher */
};

/*
 * The largest string sm_addrbuf should hold is a full-size IPv6 address
 * (no "::" anywhere) with a scope ID.  The buffer size is computed to
 * hold eight groups of colon-separated four-hex-digit numbers, a
 * percent sign, a scope id (at most 32 bits, in decimal), and NUL.
 */
#define NSM_ADDRBUF		((8 * 4 + 7) + (1 + 10) + 1)

struct nsm_handle {
	struct list_head	sm_link;
	atomic_t		sm_count;
	char			*sm_mon_name;
	char			*sm_name;
	struct sockaddr_storage	sm_addr;
	size_t			sm_addrlen;
	unsigned int		sm_monitored : 1,
				sm_sticky : 1;	/* don't unmonitor */
	struct nsm_private	sm_priv;
	char			sm_addrbuf[NSM_ADDRBUF];
};

/*
 * Rigorous type checking on sockaddr type conversions
 */
static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
{
	return (struct sockaddr_in *)&host->h_addr;
}

static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
{
	return (struct sockaddr *)&host->h_addr;
}

static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
{
	return (struct sockaddr_in *)&host->h_srcaddr;
}

static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
{
	return (struct sockaddr *)&host->h_srcaddr;
}

/*
 * Map an fl_owner_t into a unique 32-bit "pid"
 */
struct nlm_lockowner {
	struct list_head list;
	atomic_t count;

	struct nlm_host *host;
	fl_owner_t owner;
	uint32_t pid;
};

struct nlm_wait;

/*
 * Memory chunk for NLM client RPC request.
 */
#define NLMCLNT_OHSIZE		((__NEW_UTS_LEN) + 10u)
struct nlm_rqst {
	atomic_t		a_count;
	unsigned int		a_flags;	/* initial RPC task flags */
	struct nlm_host *	a_host;		/* host handle */
	struct nlm_args		a_args;		/* arguments */
	struct nlm_res		a_res;		/* result */
	struct nlm_block *	a_block;
	unsigned int		a_retries;	/* Retry count */
	u8			a_owner[NLMCLNT_OHSIZE];
};

/*
 * This struct describes a file held open by lockd on behalf of
 * an NFS client.
 */
struct nlm_file {
	struct hlist_node	f_list;		/* linked list */
	struct nfs_fh		f_handle;	/* NFS file handle */
	struct file *		f_file;		/* VFS file pointer */
	struct nlm_share *	f_shares;	/* DOS shares */
	struct list_head	f_blocks;	/* blocked locks */
	unsigned int		f_locks;	/* guesstimate # of locks */
	unsigned int		f_count;	/* reference count */
	struct mutex		f_mutex;	/* avoid concurrent access */
};

/*
 * This is a server block (i.e. a lock requested by some client which
 * couldn't be granted because of a conflicting lock).
 */
#define NLM_NEVER		(~(unsigned long) 0)
/* timeout on non-blocking call: */
#define NLM_TIMEOUT		(7 * HZ)

struct nlm_block {
	struct kref		b_count;	/* Reference count */
	struct list_head	b_list;		/* linked list of all blocks */
	struct list_head	b_flist;	/* linked list (per file) */
	struct nlm_rqst	*	b_call;		/* RPC args & callback info */
	struct svc_serv *	b_daemon;	/* NLM service */
	struct nlm_host *	b_host;		/* host handle for RPC clnt */
	unsigned long		b_when;		/* next re-xmit */
	unsigned int		b_id;		/* block id */
	unsigned char		b_granted;	/* VFS granted lock */
	struct nlm_file *	b_file;		/* file in question */
	struct cache_req *	b_cache_req;	/* deferred request handling */
	struct file_lock *	b_fl;		/* set for GETLK */
	struct cache_deferred_req * b_deferred_req;
	unsigned int		b_flags;	/* block flags */
#define B_QUEUED		1	/* lock queued */
#define B_GOT_CALLBACK		2	/* got lock or conflicting lock */
#define B_TIMED_OUT		4	/* filesystem too slow to respond */
};

/*
 * Global variables
 */
extern struct rpc_program	nlm_program;
extern struct svc_procedure	nlmsvc_procedures[];
#ifdef CONFIG_LOCKD_V4
extern struct svc_procedure	nlmsvc_procedures4[];
#endif
extern int			nlmsvc_grace_period;
extern unsigned long		nlmsvc_timeout;
extern int			nsm_use_hostnames;
extern u32			nsm_local_state;

/*
 * Lockd client functions
 */
struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
void		  nlm_release_call(struct nlm_rqst *);
int		  nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
int		  nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
void		  nlmclnt_finish_block(struct nlm_wait *block);
int		  nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
__be32		  nlmclnt_grant(const struct sockaddr *addr,
				const struct nlm_lock *lock);
void		  nlmclnt_recovery(struct nlm_host *);
int		  nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
void		  nlmclnt_next_cookie(struct nlm_cookie *);

/*
 * Host cache
 */
struct nlm_host  *nlmclnt_lookup_host(const struct sockaddr *sap,
					const size_t salen,
					const unsigned short protocol,
					const u32 version,
					const char *hostname,
					int noresvport);
struct nlm_host  *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
					const char *hostname,
					const size_t hostname_len);
struct rpc_clnt * nlm_bind_host(struct nlm_host *);
void		  nlm_rebind_host(struct nlm_host *);
struct nlm_host * nlm_get_host(struct nlm_host *);
void		  nlm_release_host(struct nlm_host *);
void		  nlm_shutdown_hosts(void);
void		  nlm_host_rebooted(const struct nlm_reboot *);

/*
 * Host monitoring
 */
int		  nsm_monitor(const struct nlm_host *host);
void		  nsm_unmonitor(const struct nlm_host *host);

struct nsm_handle *nsm_get_handle(const struct sockaddr *sap,
					const size_t salen,
					const char *hostname,
					const size_t hostname_len);
struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info);
void		  nsm_release(struct nsm_handle *nsm);

/*
 * This is used in garbage collection and resource reclaim
 * A return value != 0 means destroy the lock/block/share
 */
typedef int	  (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);

/*
 * Server-side lock handling
 */
__be32		  nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
			      struct nlm_host *, struct nlm_lock *, int,
			      struct nlm_cookie *, int);
__be32		  nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
__be32		  nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
			struct nlm_host *, struct nlm_lock *,
			struct nlm_lock *, struct nlm_cookie *);
__be32		  nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
unsigned long	  nlmsvc_retry_blocked(void);
void		  nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
					nlm_host_match_fn_t match);
void		  nlmsvc_grant_reply(struct nlm_cookie *, __be32);

/*
 * File handling for the server personality
 */
__be32		  nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
					struct nfs_fh *);
void		  nlm_release_file(struct nlm_file *);
void		  nlmsvc_mark_resources(void);
void		  nlmsvc_free_host_resources(struct nlm_host *);
void		  nlmsvc_invalidate_all(void);

/*
 * Cluster failover support
 */
int           nlmsvc_unlock_all_by_sb(struct super_block *sb);
int           nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);

static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
{
	return file->f_file->f_path.dentry->d_inode;
}

static inline int __nlm_privileged_request4(const struct sockaddr *sap)
{
	const struct sockaddr_in *sin = (struct sockaddr_in *)sap;

	if (ntohs(sin->sin_port) > 1023)
		return 0;

	return ipv4_is_loopback(sin->sin_addr.s_addr);
}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static inline int __nlm_privileged_request6(const struct sockaddr *sap)
{
	const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;

	if (ntohs(sin6->sin6_port) > 1023)
		return 0;

	if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
		return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);

	return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
}
#else	/* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
static inline int __nlm_privileged_request6(const struct sockaddr *sap)
{
	return 0;
}
#endif	/* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */

/*
 * Ensure incoming requests are from local privileged callers.
 *
 * Return TRUE if sender is local and is connecting via a privileged port;
 * otherwise return FALSE.
 */
static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
{
	const struct sockaddr *sap = svc_addr(rqstp);

	switch (sap->sa_family) {
	case AF_INET:
		return __nlm_privileged_request4(sap);
	case AF_INET6:
		return __nlm_privileged_request6(sap);
	default:
		return 0;
	}
}

/*
 * Compare two NLM locks.
 * When the second lock is of type F_UNLCK, this acts like a wildcard.
 */
static inline int nlm_compare_locks(const struct file_lock *fl1,
				    const struct file_lock *fl2)
{
	return	fl1->fl_pid   == fl2->fl_pid
	     && fl1->fl_owner == fl2->fl_owner
	     && fl1->fl_start == fl2->fl_start
	     && fl1->fl_end   == fl2->fl_end
	     &&(fl1->fl_type  == fl2->fl_type || fl2->fl_type == F_UNLCK);
}

extern const struct lock_manager_operations nlmsvc_lock_operations;

#endif /* __KERNEL__ */

#endif /* LINUX_LOCKD_LOCKD_H */
Commit	Line	Data
	1	/*
	2	* linux/include/linux/lockd/lockd.h
	3	*
	4	* General-purpose lockd include file.
	5	*
	6	* Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
	9	#ifndef LINUX_LOCKD_LOCKD_H
	10	#define LINUX_LOCKD_LOCKD_H
	11
	12	#ifdef __KERNEL__
	13
	14	#include <linux/in.h>
	15	#include <linux/in6.h>
	16	#include <net/ipv6.h>
	17	#include <linux/fs.h>
	18	#include <linux/kref.h>
	19	#include <linux/utsname.h>
	20	#include <linux/nfsd/nfsfh.h>
	21	#include <linux/lockd/bind.h>
	22	#include <linux/lockd/xdr.h>
	23	#ifdef CONFIG_LOCKD_V4
	24	#include <linux/lockd/xdr4.h>
	25	#endif
	26	#include <linux/lockd/debug.h>
	27
	28	/*
	29	* Version string
	30	*/
	31	#define LOCKD_VERSION "0.5"
	32
	33	/*
	34	* Default timeout for RPC calls (seconds)
	35	*/
	36	#define LOCKD_DFLT_TIMEO 10
	37
	38	/*
	39	* Lockd host handle (used both by the client and server personality).
	40	*/
	41	struct nlm_host {
	42	struct hlist_node h_hash; /* doubly linked list */
	43	struct sockaddr_storage h_addr; /* peer address */
	44	size_t h_addrlen;
	45	struct sockaddr_storage h_srcaddr; /* our address (optional) */
	46	struct rpc_clnt h_rpcclnt; / RPC client to talk to peer */
	47	char h_name; / remote hostname */
	48	u32 h_version; /* interface version */
	49	unsigned short h_proto; /* transport proto */
	50	unsigned short h_reclaiming : 1,
	51	h_server : 1, /* server side, not client side */
	52	h_noresvport : 1,
	53	h_inuse : 1;
	54	wait_queue_head_t h_gracewait; /* wait while reclaiming */
	55	struct rw_semaphore h_rwsem; /* Reboot recovery lock */
	56	u32 h_state; /* pseudo-state counter */
	57	u32 h_nsmstate; /* true remote NSM state */
	58	u32 h_pidcount; /* Pseudopids */
	59	atomic_t h_count; /* reference count */
	60	struct mutex h_mutex; /* mutex for pmap binding */
	61	unsigned long h_nextrebind; /* next portmap call */
	62	unsigned long h_expires; /* eligible for GC */
	63	struct list_head h_lockowners; /* Lockowners for the client */
	64	spinlock_t h_lock;
	65	struct list_head h_granted; /* Locks in GRANTED state */
	66	struct list_head h_reclaim; /* Locks in RECLAIM state */
	67	struct nsm_handle h_nsmhandle; / NSM status handle */
	68	char h_addrbuf; / address eyecatcher */
	69	};
	70
	71	/*
	72	* The largest string sm_addrbuf should hold is a full-size IPv6 address
	73	* (no "::" anywhere) with a scope ID. The buffer size is computed to
	74	* hold eight groups of colon-separated four-hex-digit numbers, a
	75	* percent sign, a scope id (at most 32 bits, in decimal), and NUL.
	76	*/
	77	#define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
	78
	79	struct nsm_handle {
	80	struct list_head sm_link;
	81	atomic_t sm_count;
	82	char *sm_mon_name;
	83	char *sm_name;
	84	struct sockaddr_storage sm_addr;
	85	size_t sm_addrlen;
	86	unsigned int sm_monitored : 1,
	87	sm_sticky : 1; /* don't unmonitor */
	88	struct nsm_private sm_priv;
	89	char sm_addrbuf[NSM_ADDRBUF];
	90	};
	91
	92	/*
	93	* Rigorous type checking on sockaddr type conversions
	94	*/
	95	static inline struct sockaddr_in nlm_addr_in(const struct nlm_host host)
	96	{
	97	return (struct sockaddr_in *)&host->h_addr;
	98	}
	99
	100	static inline struct sockaddr nlm_addr(const struct nlm_host host)
	101	{
	102	return (struct sockaddr *)&host->h_addr;
	103	}
	104
	105	static inline struct sockaddr_in nlm_srcaddr_in(const struct nlm_host host)
	106	{
	107	return (struct sockaddr_in *)&host->h_srcaddr;
	108	}
	109
	110	static inline struct sockaddr nlm_srcaddr(const struct nlm_host host)
	111	{
	112	return (struct sockaddr *)&host->h_srcaddr;
	113	}
	114
	115	/*
	116	* Map an fl_owner_t into a unique 32-bit "pid"
	117	*/
	118	struct nlm_lockowner {
	119	struct list_head list;
	120	atomic_t count;
	121
	122	struct nlm_host *host;
	123	fl_owner_t owner;
	124	uint32_t pid;
	125	};
	126
	127	struct nlm_wait;
	128
	129	/*
	130	* Memory chunk for NLM client RPC request.
	131	*/
	132	#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
	133	struct nlm_rqst {
	134	atomic_t a_count;
	135	unsigned int a_flags; /* initial RPC task flags */
	136	struct nlm_host * a_host; /* host handle */
	137	struct nlm_args a_args; /* arguments */
	138	struct nlm_res a_res; /* result */
	139	struct nlm_block * a_block;
	140	unsigned int a_retries; /* Retry count */
	141	u8 a_owner[NLMCLNT_OHSIZE];
	142	};
	143
	144	/*
	145	* This struct describes a file held open by lockd on behalf of
	146	* an NFS client.
	147	*/
	148	struct nlm_file {
	149	struct hlist_node f_list; /* linked list */
	150	struct nfs_fh f_handle; /* NFS file handle */
	151	struct file * f_file; /* VFS file pointer */
	152	struct nlm_share * f_shares; /* DOS shares */
	153	struct list_head f_blocks; /* blocked locks */
	154	unsigned int f_locks; /* guesstimate # of locks */
	155	unsigned int f_count; /* reference count */
	156	struct mutex f_mutex; /* avoid concurrent access */
	157	};
	158
	159	/*
	160	* This is a server block (i.e. a lock requested by some client which
	161	* couldn't be granted because of a conflicting lock).
	162	*/
	163	#define NLM_NEVER (~(unsigned long) 0)
	164	/* timeout on non-blocking call: */
	165	#define NLM_TIMEOUT (7 * HZ)
	166
	167	struct nlm_block {
	168	struct kref b_count; /* Reference count */
	169	struct list_head b_list; /* linked list of all blocks */
	170	struct list_head b_flist; /* linked list (per file) */
	171	struct nlm_rqst * b_call; /* RPC args & callback info */
	172	struct svc_serv * b_daemon; /* NLM service */
	173	struct nlm_host * b_host; /* host handle for RPC clnt */
	174	unsigned long b_when; /* next re-xmit */
	175	unsigned int b_id; /* block id */
	176	unsigned char b_granted; /* VFS granted lock */
	177	struct nlm_file * b_file; /* file in question */
	178	struct cache_req * b_cache_req; /* deferred request handling */
	179	struct file_lock * b_fl; /* set for GETLK */
	180	struct cache_deferred_req * b_deferred_req;
	181	unsigned int b_flags; /* block flags */
	182	#define B_QUEUED 1 /* lock queued */
	183	#define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
	184	#define B_TIMED_OUT 4 /* filesystem too slow to respond */
	185	};
	186
	187	/*
	188	* Global variables
	189	*/
	190	extern struct rpc_program nlm_program;
	191	extern struct svc_procedure nlmsvc_procedures[];
	192	#ifdef CONFIG_LOCKD_V4
	193	extern struct svc_procedure nlmsvc_procedures4[];
	194	#endif
	195	extern int nlmsvc_grace_period;
	196	extern unsigned long nlmsvc_timeout;
	197	extern int nsm_use_hostnames;
	198	extern u32 nsm_local_state;
	199
	200	/*
	201	* Lockd client functions
	202	*/
	203	struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
	204	void nlm_release_call(struct nlm_rqst *);
	205	int nlm_async_call(struct nlm_rqst , u32, const struct rpc_call_ops );
	206	int nlm_async_reply(struct nlm_rqst , u32, const struct rpc_call_ops );
	207	struct nlm_wait * nlmclnt_prepare_block(struct nlm_host host, struct file_lock fl);
	208	void nlmclnt_finish_block(struct nlm_wait *block);
	209	int nlmclnt_block(struct nlm_wait block, struct nlm_rqst req, long timeout);
	210	__be32 nlmclnt_grant(const struct sockaddr *addr,
	211	const struct nlm_lock *lock);
	212	void nlmclnt_recovery(struct nlm_host *);
	213	int nlmclnt_reclaim(struct nlm_host , struct file_lock );
	214	void nlmclnt_next_cookie(struct nlm_cookie *);
	215
	216	/*
	217	* Host cache
	218	*/
	219	struct nlm_host nlmclnt_lookup_host(const struct sockaddr sap,
	220	const size_t salen,
	221	const unsigned short protocol,
	222	const u32 version,
	223	const char *hostname,
	224	int noresvport);
	225	struct nlm_host nlmsvc_lookup_host(const struct svc_rqst rqstp,
	226	const char *hostname,
	227	const size_t hostname_len);
	228	struct rpc_clnt * nlm_bind_host(struct nlm_host *);
	229	void nlm_rebind_host(struct nlm_host *);
	230	struct nlm_host * nlm_get_host(struct nlm_host *);
	231	void nlm_release_host(struct nlm_host *);
	232	void nlm_shutdown_hosts(void);
	233	void nlm_host_rebooted(const struct nlm_reboot *);
	234
	235	/*
	236	* Host monitoring
	237	*/
	238	int nsm_monitor(const struct nlm_host *host);
	239	void nsm_unmonitor(const struct nlm_host *host);
	240
	241	struct nsm_handle nsm_get_handle(const struct sockaddr sap,
	242	const size_t salen,
	243	const char *hostname,
	244	const size_t hostname_len);
	245	struct nsm_handle nsm_reboot_lookup(const struct nlm_reboot info);
	246	void nsm_release(struct nsm_handle *nsm);
	247
	248	/*
	249	* This is used in garbage collection and resource reclaim
	250	* A return value != 0 means destroy the lock/block/share
	251	*/
	252	typedef int (nlm_host_match_fn_t)(void cur, struct nlm_host *ref);
	253
	254	/*
	255	* Server-side lock handling
	256	*/
	257	__be32 nlmsvc_lock(struct svc_rqst , struct nlm_file ,
	258	struct nlm_host , struct nlm_lock , int,
	259	struct nlm_cookie *, int);
	260	__be32 nlmsvc_unlock(struct nlm_file , struct nlm_lock );
	261	__be32 nlmsvc_testlock(struct svc_rqst , struct nlm_file ,
	262	struct nlm_host , struct nlm_lock ,
	263	struct nlm_lock , struct nlm_cookie );
	264	__be32 nlmsvc_cancel_blocked(struct nlm_file , struct nlm_lock );
	265	unsigned long nlmsvc_retry_blocked(void);
	266	void nlmsvc_traverse_blocks(struct nlm_host , struct nlm_file ,
	267	nlm_host_match_fn_t match);
	268	void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
	269
	270	/*
	271	* File handling for the server personality
	272	*/
	273	__be32 nlm_lookup_file(struct svc_rqst , struct nlm_file *,
	274	struct nfs_fh *);
	275	void nlm_release_file(struct nlm_file *);
	276	void nlmsvc_mark_resources(void);
	277	void nlmsvc_free_host_resources(struct nlm_host *);
	278	void nlmsvc_invalidate_all(void);
	279
	280	/*
	281	* Cluster failover support
	282	*/
	283	int nlmsvc_unlock_all_by_sb(struct super_block *sb);
	284	int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
	285
	286	static inline struct inode nlmsvc_file_inode(struct nlm_file file)
	287	{
	288	return file->f_file->f_path.dentry->d_inode;
	289	}
	290
	291	static inline int __nlm_privileged_request4(const struct sockaddr *sap)
	292	{
	293	const struct sockaddr_in sin = (struct sockaddr_in )sap;
	294
	295	if (ntohs(sin->sin_port) > 1023)
	296	return 0;
	297
	298	return ipv4_is_loopback(sin->sin_addr.s_addr);
	299	}
	300
	301	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	302	static inline int __nlm_privileged_request6(const struct sockaddr *sap)
	303	{
	304	const struct sockaddr_in6 sin6 = (struct sockaddr_in6 )sap;
	305
	306	if (ntohs(sin6->sin6_port) > 1023)
	307	return 0;
	308
	309	if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
	310	return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
	311
	312	return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
	313	}
	314	#else /* defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE) */
	315	static inline int __nlm_privileged_request6(const struct sockaddr *sap)
	316	{
	317	return 0;
	318	}
	319	#endif /* defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE) */
	320
	321	/*
	322	* Ensure incoming requests are from local privileged callers.
	323	*
	324	* Return TRUE if sender is local and is connecting via a privileged port;
	325	* otherwise return FALSE.
	326	*/
	327	static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
	328	{
	329	const struct sockaddr *sap = svc_addr(rqstp);
	330
	331	switch (sap->sa_family) {
	332	case AF_INET:
	333	return __nlm_privileged_request4(sap);
	334	case AF_INET6:
	335	return __nlm_privileged_request6(sap);
	336	default:
	337	return 0;
	338	}
	339	}
	340
	341	/*
	342	* Compare two NLM locks.
	343	* When the second lock is of type F_UNLCK, this acts like a wildcard.
	344	*/
	345	static inline int nlm_compare_locks(const struct file_lock *fl1,
	346	const struct file_lock *fl2)
	347	{
	348	return fl1->fl_pid == fl2->fl_pid
	349	&& fl1->fl_owner == fl2->fl_owner
	350	&& fl1->fl_start == fl2->fl_start
	351	&& fl1->fl_end == fl2->fl_end
	352	&&(fl1->fl_type == fl2->fl_type \|\| fl2->fl_type == F_UNLCK);
	353	}
	354
	355	extern const struct lock_manager_operations nlmsvc_lock_operations;
	356
	357	#endif /* __KERNEL__ */
	358
	359	#endif /* LINUX_LOCKD_LOCKD_H */