include/linux/lockd/lockd.h - third_party/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * 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/refcount.h>
 #include <linux/utsname.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>
 #include <linux/sunrpc/svc.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) */
 	size_t			h_srcaddrlen;
 	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 */
 	refcount_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 */
 	struct net		*net;		/* host net */
 	char			nodename[UNX_MAXNODENAME + 1];
 	const struct nlmclnt_operations	*h_nlmclnt_ops;	/* Callback ops for NLM users */
 };

 /*
  * 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;
 	refcount_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;
 	refcount_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 {
 	refcount_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];
 	void *	a_callback_data; /* sent to nlmclnt_operations callbacks */
 };

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

 /*
  * Lockd client functions
  */
 struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
 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 *);
 void		  nlmclnt_release_call(struct nlm_rqst *);
 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 *,
 				  struct nlm_rqst *);
 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 net *net);
 void		  nlmclnt_release_host(struct nlm_host *);
 struct nlm_host  *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
 					const char *hostname,
 					const size_t hostname_len);
 void		  nlmsvc_release_host(struct nlm_host *);
 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_shutdown_hosts(void);
 void		  nlm_shutdown_hosts_net(struct net *net);
 void		  nlm_host_rebooted(const struct net *net,
 					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 net *net,
 					const struct sockaddr *sap,
 					const size_t salen,
 					const char *hostname,
 					const size_t hostname_len);
 struct nsm_handle *nsm_reboot_lookup(const struct net *net,
 					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 net *net, 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 net *net, 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);
 void		  nlmsvc_release_call(struct nlm_rqst *);

 /*
  * 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(struct net *);
 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_inode(file->f_file);
 }

 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 IS_ENABLED(CONFIG_IPV6)
 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	/* IS_ENABLED(CONFIG_IPV6) */
 static inline int __nlm_privileged_request6(const struct sockaddr *sap)
 {
 	return 0;
 }
 #endif	/* IS_ENABLED(CONFIG_IPV6) */

 /*
  * 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 file_inode(fl1->fl_file) == file_inode(fl2->fl_file)
 	     && 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 */
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* 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/refcount.h>
	#include <linux/utsname.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>
	#include <linux/sunrpc/svc.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) */
	size_t h_srcaddrlen;
	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 */
	refcount_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 */
	struct net net; / host net */
	char nodename[UNX_MAXNODENAME + 1];
	const struct nlmclnt_operations h_nlmclnt_ops; / Callback ops for NLM users */
	};

	/*
	* 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;
	refcount_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;
	refcount_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 {
	refcount_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];
	void * a_callback_data; /* sent to nlmclnt_operations callbacks */
	};

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

	/*
	* Lockd client functions
	*/
	struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
	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 );
	void nlmclnt_release_call(struct nlm_rqst *);
	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 ,
	struct nlm_rqst *);
	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 net *net);
	void nlmclnt_release_host(struct nlm_host *);
	struct nlm_host nlmsvc_lookup_host(const struct svc_rqst rqstp,
	const char *hostname,
	const size_t hostname_len);
	void nlmsvc_release_host(struct nlm_host *);
	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_shutdown_hosts(void);
	void nlm_shutdown_hosts_net(struct net *net);
	void nlm_host_rebooted(const struct net *net,
	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 net net,
	const struct sockaddr *sap,
	const size_t salen,
	const char *hostname,
	const size_t hostname_len);
	struct nsm_handle nsm_reboot_lookup(const struct net net,
	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 net net, 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 net net, 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);
	void nlmsvc_release_call(struct nlm_rqst *);

	/*
	* 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(struct net *);
	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_inode(file->f_file);
	}

	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 IS_ENABLED(CONFIG_IPV6)
	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 /* IS_ENABLED(CONFIG_IPV6) */
	static inline int __nlm_privileged_request6(const struct sockaddr *sap)
	{
	return 0;
	}
	#endif /* IS_ENABLED(CONFIG_IPV6) */

	/*
	* 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 file_inode(fl1->fl_file) == file_inode(fl2->fl_file)
	&& 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 */