include/linux/lockd/lockd.h - kernel/msm-4.9 - Gitiles

 /*
  * 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/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_in	h_addr;		/* peer address */
 	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_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 */
 };

 struct nsm_handle {
 	struct list_head	sm_link;
 	atomic_t		sm_count;
 	char *			sm_name;
 	struct sockaddr_in	sm_addr;
 	unsigned int		sm_monitored : 1,
 				sm_sticky : 1;	/* don't unmonitor */
 };

 /*
  * 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		(sizeof(utsname()->nodename)+10)
 struct nlm_rqst {
 	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)
 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 */
 };

 /*
  * 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;

 /*
  * 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_in *addr, const struct nlm_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_in *, int, int, const char *, int);
 struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *, const char *, int);
 struct nlm_host * nlm_lookup_host(int server, const struct sockaddr_in *, int, int, const char *, int);
 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);
 extern void	  nlm_host_rebooted(const struct sockaddr_in *, const char *, int, u32);
 struct nsm_handle *nsm_find(const struct sockaddr_in *, const char *, int);
 void		  nsm_release(struct nsm_handle *);


 /*
  * 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)(struct nlm_host *cur, struct nlm_host *ref);

 /*
  * Server-side lock handling
  */
 __be32		  nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
 					struct nlm_lock *, int, struct nlm_cookie *);
 __be32		  nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
 __be32		  nlmsvc_testlock(struct nlm_file *, struct nlm_lock *,
 					struct nlm_lock *);
 __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 *, u32);

 /*
  * 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);

 static __inline__ struct inode *
 nlmsvc_file_inode(struct nlm_file *file)
 {
 	return file->f_file->f_dentry->d_inode;
 }

 /*
  * Compare two host addresses (needs modifying for ipv6)
  */
 static __inline__ int
 nlm_cmp_addr(const struct sockaddr_in *sin1, const struct sockaddr_in *sin2)
 {
 	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
 }

 /*
  * 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 struct lock_manager_operations nlmsvc_lock_operations;

 #endif /* __KERNEL__ */

 #endif /* 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/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_in h_addr; /* peer address */
	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_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 */
	};

	struct nsm_handle {
	struct list_head sm_link;
	atomic_t sm_count;
	char * sm_name;
	struct sockaddr_in sm_addr;
	unsigned int sm_monitored : 1,
	sm_sticky : 1; /* don't unmonitor */
	};

	/*
	* 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 (sizeof(utsname()->nodename)+10)
	struct nlm_rqst {
	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)
	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 */
	};

	/*
	* 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;

	/*
	* 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_in addr, const struct nlm_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_in , int, int, const char , int);
	struct nlm_host * nlmsvc_lookup_host(struct svc_rqst , const char , int);
	struct nlm_host * nlm_lookup_host(int server, const struct sockaddr_in , int, int, const char , int);
	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);
	extern void nlm_host_rebooted(const struct sockaddr_in , const char , int, u32);
	struct nsm_handle nsm_find(const struct sockaddr_in , const char *, int);
	void nsm_release(struct nsm_handle *);


	/*
	* 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)(struct nlm_host cur, struct nlm_host *ref);

	/*
	* Server-side lock handling
	*/
	__be32 nlmsvc_lock(struct svc_rqst , struct nlm_file ,
	struct nlm_lock , int, struct nlm_cookie );
	__be32 nlmsvc_unlock(struct nlm_file , struct nlm_lock );
	__be32 nlmsvc_testlock(struct nlm_file , struct nlm_lock ,
	struct nlm_lock *);
	__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 *, u32);

	/*
	* 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);

	static __inline__ struct inode *
	nlmsvc_file_inode(struct nlm_file *file)
	{
	return file->f_file->f_dentry->d_inode;
	}

	/*
	* Compare two host addresses (needs modifying for ipv6)
	*/
	static __inline__ int
	nlm_cmp_addr(const struct sockaddr_in sin1, const struct sockaddr_in sin2)
	{
	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
	}

	/*
	* 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 struct lock_manager_operations nlmsvc_lock_operations;

	#endif /* __KERNEL__ */

	#endif /* LINUX_LOCKD_LOCKD_H */