[net-next-2.6.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/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 nlm_host *	h_next;		/* linked list (hash table) */
	struct sockaddr_in	h_addr;		/* peer address */
	struct rpc_clnt	*	h_rpcclnt;	/* RPC client to talk to peer */
	char			h_name[20];	/* 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,
				h_killed     : 1,
				h_monitored  : 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 */
};

/*
 * 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 nlm_file *	f_next;		/* 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 nlm_block *	f_blocks;	/* blocked locks */
	unsigned int		f_locks;	/* guesstimate # of locks */
	unsigned int		f_count;	/* reference count */
	struct semaphore	f_sema;		/* avoid concurrent access */
	int		       	f_hash;		/* hash of f_handle */
};

/*
 * 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 nlm_block *	b_next;		/* linked list (all blocks) */
	struct nlm_block *	b_fnext;	/* 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_queued;	/* re-queued */
	unsigned char		b_granted;	/* VFS granted lock */
	struct nlm_file *	b_file;		/* file in question */
};

/*
 * Valid actions for nlmsvc_traverse_files
 */
#define NLM_ACT_CHECK		0		/* check for locks */
#define NLM_ACT_MARK		1		/* mark & sweep */
#define NLM_ACT_UNLOCK		2		/* release all locks */

/*
 * 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;

/*
 * 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);
u32		  nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *);
void		  nlmclnt_recovery(struct nlm_host *, u32);
int		  nlmclnt_reclaim(struct nlm_host *, struct file_lock *);

/*
 * Host cache
 */
struct nlm_host * nlmclnt_lookup_host(struct sockaddr_in *, int, int);
struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *);
struct nlm_host * nlm_lookup_host(int server, struct sockaddr_in *, int, 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 struct nlm_host *nlm_find_client(void);


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

/*
 * File handling for the server personality
 */
u32		  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 */
Commit	Line	Data
1da177e4 LT	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
1da177e4 LT	14	#include <linux/in.h>
1da177e4 LT	15	#include <linux/fs.h>
6849c0ca	16	#include <linux/kref.h>
1da177e4 LT	17	#include <linux/utsname.h>
	18	#include <linux/nfsd/nfsfh.h>
	19	#include <linux/lockd/bind.h>
	20	#include <linux/lockd/xdr.h>
	21	#ifdef CONFIG_LOCKD_V4
	22	#include <linux/lockd/xdr4.h>
	23	#endif
	24	#include <linux/lockd/debug.h>
	25
	26	/*
	27	* Version string
	28	*/
	29	#define LOCKD_VERSION "0.5"
	30
	31	/*
	32	* Default timeout for RPC calls (seconds)
	33	*/
	34	#define LOCKD_DFLT_TIMEO 10
	35
	36	/*
	37	* Lockd host handle (used both by the client and server personality).
	38	*/
	39	struct nlm_host {
	40	struct nlm_host * h_next; /* linked list (hash table) */
	41	struct sockaddr_in h_addr; /* peer address */
	42	struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
	43	char h_name[20]; /* remote hostname */
	44	u32 h_version; /* interface version */
	45	unsigned short h_proto; /* transport proto */
	46	unsigned short h_reclaiming : 1,
	47	h_server : 1, /* server side, not client side */
	48	h_inuse : 1,
	49	h_killed : 1,
	50	h_monitored : 1;
	51	wait_queue_head_t h_gracewait; /* wait while reclaiming */
28df955a	52	struct rw_semaphore h_rwsem; /* Reboot recovery lock */
1da177e4 LT	53	u32 h_state; /* pseudo-state counter */
	54	u32 h_nsmstate; /* true remote NSM state */
	55	u32 h_pidcount; /* Pseudopids */
	56	atomic_t h_count; /* reference count */
50467914	57	struct mutex h_mutex; /* mutex for pmap binding */
1da177e4 LT	58	unsigned long h_nextrebind; /* next portmap call */
	59	unsigned long h_expires; /* eligible for GC */
	60	struct list_head h_lockowners; /* Lockowners for the client */
	61	spinlock_t h_lock;
26bcbf96 CH	62	struct list_head h_granted; /* Locks in GRANTED state */
26bcbf96 CH	63	struct list_head h_reclaim; /* Locks in RECLAIM state */
1da177e4 LT	64	};
	65
	66	/*
	67	* Map an fl_owner_t into a unique 32-bit "pid"
	68	*/
	69	struct nlm_lockowner {
	70	struct list_head list;
	71	atomic_t count;
	72
	73	struct nlm_host *host;
	74	fl_owner_t owner;
	75	uint32_t pid;
	76	};
	77
ecdbf769 TM	78	struct nlm_wait;
ecdbf769 TM	79
1da177e4 LT	80	/*
	81	* Memory chunk for NLM client RPC request.
	82	*/
e9ff3990	83	#define NLMCLNT_OHSIZE (sizeof(utsname()->nodename)+10)
1da177e4 LT	84	struct nlm_rqst {
	85	unsigned int a_flags; /* initial RPC task flags */
	86	struct nlm_host * a_host; /* host handle */
	87	struct nlm_args a_args; /* arguments */
	88	struct nlm_res a_res; /* result */
92737230	89	struct nlm_block * a_block;
aaaa9942	90	unsigned int a_retries; /* Retry count */
92737230	91	u8 a_owner[NLMCLNT_OHSIZE];
1da177e4 LT	92	};
	93
	94	/*
	95	* This struct describes a file held open by lockd on behalf of
	96	* an NFS client.
	97	*/
	98	struct nlm_file {
	99	struct nlm_file * f_next; /* linked list */
	100	struct nfs_fh f_handle; /* NFS file handle */
	101	struct file * f_file; /* VFS file pointer */
	102	struct nlm_share * f_shares; /* DOS shares */
	103	struct nlm_block * f_blocks; /* blocked locks */
	104	unsigned int f_locks; /* guesstimate # of locks */
	105	unsigned int f_count; /* reference count */
	106	struct semaphore f_sema; /* avoid concurrent access */
	107	int f_hash; /* hash of f_handle */
	108	};
	109
	110	/*
	111	* This is a server block (i.e. a lock requested by some client which
	112	* couldn't be granted because of a conflicting lock).
	113	*/
	114	#define NLM_NEVER (~(unsigned long) 0)
	115	struct nlm_block {
6849c0ca	116	struct kref b_count; /* Reference count */
1da177e4 LT	117	struct nlm_block * b_next; /* linked list (all blocks) */
1da177e4 LT	118	struct nlm_block * b_fnext; /* linked list (per file) */
92737230	119	struct nlm_rqst * b_call; /* RPC args & callback info */
1da177e4 LT	120	struct svc_serv * b_daemon; /* NLM service */
	121	struct nlm_host * b_host; /* host handle for RPC clnt */
	122	unsigned long b_when; /* next re-xmit */
	123	unsigned int b_id; /* block id */
	124	unsigned char b_queued; /* re-queued */
	125	unsigned char b_granted; /* VFS granted lock */
1da177e4 LT	126	struct nlm_file * b_file; /* file in question */
	127	};
	128
	129	/*
	130	* Valid actions for nlmsvc_traverse_files
	131	*/
	132	#define NLM_ACT_CHECK 0 /* check for locks */
	133	#define NLM_ACT_MARK 1 /* mark & sweep */
	134	#define NLM_ACT_UNLOCK 2 /* release all locks */
	135
	136	/*
	137	* Global variables
	138	*/
	139	extern struct rpc_program nlm_program;
	140	extern struct svc_procedure nlmsvc_procedures[];
	141	#ifdef CONFIG_LOCKD_V4
	142	extern struct svc_procedure nlmsvc_procedures4[];
	143	#endif
	144	extern int nlmsvc_grace_period;
	145	extern unsigned long nlmsvc_timeout;
	146
	147	/*
	148	* Lockd client functions
	149	*/
92737230 TM	150	struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
	151	void nlm_release_call(struct nlm_rqst *);
	152	int nlm_async_call(struct nlm_rqst , u32, const struct rpc_call_ops );
d4716624	153	int nlm_async_reply(struct nlm_rqst , u32, const struct rpc_call_ops );
3a649b88 TM	154	struct nlm_wait * nlmclnt_prepare_block(struct nlm_host host, struct file_lock fl);
	155	void nlmclnt_finish_block(struct nlm_wait *block);
	156	int nlmclnt_block(struct nlm_wait block, struct nlm_rqst req, long timeout);
5ac5f9d1	157	u32 nlmclnt_grant(const struct sockaddr_in addr, const struct nlm_lock );
1da177e4 LT	158	void nlmclnt_recovery(struct nlm_host *, u32);
1da177e4 LT	159	int nlmclnt_reclaim(struct nlm_host , struct file_lock );
1da177e4 LT	160
	161	/*
	162	* Host cache
	163	*/
	164	struct nlm_host * nlmclnt_lookup_host(struct sockaddr_in *, int, int);
	165	struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *);
	166	struct nlm_host * nlm_lookup_host(int server, struct sockaddr_in *, int, int);
	167	struct rpc_clnt * nlm_bind_host(struct nlm_host *);
	168	void nlm_rebind_host(struct nlm_host *);
	169	struct nlm_host * nlm_get_host(struct nlm_host *);
	170	void nlm_release_host(struct nlm_host *);
	171	void nlm_shutdown_hosts(void);
	172	extern struct nlm_host *nlm_find_client(void);
	173
	174
	175	/*
	176	* Server-side lock handling
	177	*/
1da177e4 LT	178	u32 nlmsvc_lock(struct svc_rqst , struct nlm_file ,
	179	struct nlm_lock , int, struct nlm_cookie );
	180	u32 nlmsvc_unlock(struct nlm_file , struct nlm_lock );
	181	u32 nlmsvc_testlock(struct nlm_file , struct nlm_lock ,
	182	struct nlm_lock *);
	183	u32 nlmsvc_cancel_blocked(struct nlm_file , struct nlm_lock );
	184	unsigned long nlmsvc_retry_blocked(void);
f3ee439f	185	void nlmsvc_traverse_blocks(struct nlm_host , struct nlm_file ,
1da177e4 LT	186	int action);
	187	void nlmsvc_grant_reply(struct svc_rqst , struct nlm_cookie , u32);
	188
	189	/*
	190	* File handling for the server personality
	191	*/
	192	u32 nlm_lookup_file(struct svc_rqst , struct nlm_file *,
	193	struct nfs_fh *);
	194	void nlm_release_file(struct nlm_file *);
	195	void nlmsvc_mark_resources(void);
	196	void nlmsvc_free_host_resources(struct nlm_host *);
	197	void nlmsvc_invalidate_all(void);
	198
	199	static __inline__ struct inode *
	200	nlmsvc_file_inode(struct nlm_file *file)
	201	{
	202	return file->f_file->f_dentry->d_inode;
	203	}
	204
	205	/*
	206	* Compare two host addresses (needs modifying for ipv6)
	207	*/
	208	static __inline__ int
5ac5f9d1	209	nlm_cmp_addr(const struct sockaddr_in sin1, const struct sockaddr_in sin2)
1da177e4 LT	210	{
	211	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
	212	}
	213
	214	/*
	215	* Compare two NLM locks.
	216	* When the second lock is of type F_UNLCK, this acts like a wildcard.
	217	*/
	218	static __inline__ int
5ac5f9d1	219	nlm_compare_locks(const struct file_lock fl1, const struct file_lock fl2)
1da177e4 LT	220	{
1da177e4 LT	221	return fl1->fl_pid == fl2->fl_pid
3134cbec	222	&& fl1->fl_owner == fl2->fl_owner
1da177e4 LT	223	&& fl1->fl_start == fl2->fl_start
	224	&& fl1->fl_end == fl2->fl_end
	225	&&(fl1->fl_type == fl2->fl_type \|\| fl2->fl_type == F_UNLCK);
	226	}
	227
	228	extern struct lock_manager_operations nlmsvc_lock_operations;
	229
	230	#endif /* __KERNEL__ */
	231
	232	#endif /* LINUX_LOCKD_LOCKD_H */