[mirror_ubuntu-zesty-kernel.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 hlist_node	h_hash;		/* doubly linked list */
	struct sockaddr_in	h_addr;		/* peer address */
	struct sockaddr_in	h_saddr;	/* 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_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		((__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;

/*
 * 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 *sin,
					int proto, u32 version,
					const char *hostname,
					unsigned int hostname_len);
struct nlm_host  *nlmsvc_lookup_host(struct svc_rqst *, const char *,
					unsigned 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 *,
					unsigned int, u32);
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)(void *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 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(__be32 server_addr);

static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
{
	return file->f_file->f_path.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 {
0cea3276	40	struct hlist_node h_hash; /* doubly linked list */
1da177e4	41	struct sockaddr_in h_addr; /* peer address */
c98451bd	42	struct sockaddr_in h_saddr; /* our address (optional) */
1da177e4	43	struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
8dead0db	44	char * h_name; /* remote hostname */
1da177e4 LT	45	u32 h_version; /* interface version */
	46	unsigned short h_proto; /* transport proto */
	47	unsigned short h_reclaiming : 1,
	48	h_server : 1, /* server side, not client side */
350fce8d	49	h_inuse : 1;
1da177e4	50	wait_queue_head_t h_gracewait; /* wait while reclaiming */
28df955a	51	struct rw_semaphore h_rwsem; /* Reboot recovery lock */
1da177e4 LT	52	u32 h_state; /* pseudo-state counter */
	53	u32 h_nsmstate; /* true remote NSM state */
	54	u32 h_pidcount; /* Pseudopids */
	55	atomic_t h_count; /* reference count */
50467914	56	struct mutex h_mutex; /* mutex for pmap binding */
1da177e4 LT	57	unsigned long h_nextrebind; /* next portmap call */
	58	unsigned long h_expires; /* eligible for GC */
	59	struct list_head h_lockowners; /* Lockowners for the client */
	60	spinlock_t h_lock;
26bcbf96 CH	61	struct list_head h_granted; /* Locks in GRANTED state */
26bcbf96 CH	62	struct list_head h_reclaim; /* Locks in RECLAIM state */
8dead0db OK	63	struct nsm_handle * h_nsmhandle; /* NSM status handle */
	64	};
	65
	66	struct nsm_handle {
	67	struct list_head sm_link;
	68	atomic_t sm_count;
	69	char * sm_name;
	70	struct sockaddr_in sm_addr;
	71	unsigned int sm_monitored : 1,
	72	sm_sticky : 1; /* don't unmonitor */
1da177e4 LT	73	};
	74
	75	/*
	76	* Map an fl_owner_t into a unique 32-bit "pid"
	77	*/
	78	struct nlm_lockowner {
	79	struct list_head list;
	80	atomic_t count;
	81
	82	struct nlm_host *host;
	83	fl_owner_t owner;
	84	uint32_t pid;
	85	};
	86
ecdbf769 TM	87	struct nlm_wait;
ecdbf769 TM	88
1da177e4 LT	89	/*
	90	* Memory chunk for NLM client RPC request.
	91	*/
511d2e88	92	#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
1da177e4	93	struct nlm_rqst {
5e7f37a7	94	atomic_t a_count;
1da177e4 LT	95	unsigned int a_flags; /* initial RPC task flags */
	96	struct nlm_host * a_host; /* host handle */
	97	struct nlm_args a_args; /* arguments */
	98	struct nlm_res a_res; /* result */
92737230	99	struct nlm_block * a_block;
aaaa9942	100	unsigned int a_retries; /* Retry count */
92737230	101	u8 a_owner[NLMCLNT_OHSIZE];
1da177e4 LT	102	};
	103
	104	/*
	105	* This struct describes a file held open by lockd on behalf of
	106	* an NFS client.
	107	*/
	108	struct nlm_file {
07ba8063	109	struct hlist_node f_list; /* linked list */
1da177e4 LT	110	struct nfs_fh f_handle; /* NFS file handle */
	111	struct file * f_file; /* VFS file pointer */
	112	struct nlm_share * f_shares; /* DOS shares */
68a2d76c	113	struct list_head f_blocks; /* blocked locks */
1da177e4 LT	114	unsigned int f_locks; /* guesstimate # of locks */
1da177e4 LT	115	unsigned int f_count; /* reference count */
89e63ef6	116	struct mutex f_mutex; /* avoid concurrent access */
1da177e4 LT	117	};
	118
	119	/*
	120	* This is a server block (i.e. a lock requested by some client which
	121	* couldn't be granted because of a conflicting lock).
	122	*/
	123	#define NLM_NEVER (~(unsigned long) 0)
2b36f412 ME	124	/* timeout on non-blocking call: */
	125	#define NLM_TIMEOUT (7 * HZ)
	126
1da177e4	127	struct nlm_block {
6849c0ca	128	struct kref b_count; /* Reference count */
68a2d76c OK	129	struct list_head b_list; /* linked list of all blocks */
68a2d76c OK	130	struct list_head b_flist; /* linked list (per file) */
92737230	131	struct nlm_rqst * b_call; /* RPC args & callback info */
1da177e4 LT	132	struct svc_serv * b_daemon; /* NLM service */
	133	struct nlm_host * b_host; /* host handle for RPC clnt */
	134	unsigned long b_when; /* next re-xmit */
	135	unsigned int b_id; /* block id */
1da177e4	136	unsigned char b_granted; /* VFS granted lock */
1da177e4	137	struct nlm_file * b_file; /* file in question */
2b36f412 ME	138	struct cache_req * b_cache_req; /* deferred request handling */
	139	struct file_lock * b_fl; /* set for GETLK */
	140	struct cache_deferred_req * b_deferred_req;
	141	unsigned int b_flags; /* block flags */
	142	#define B_QUEUED 1 /* lock queued */
	143	#define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
	144	#define B_TIMED_OUT 4 /* filesystem too slow to respond */
1da177e4 LT	145	};
1da177e4 LT	146
1da177e4 LT	147	/*
	148	* Global variables
	149	*/
	150	extern struct rpc_program nlm_program;
	151	extern struct svc_procedure nlmsvc_procedures[];
	152	#ifdef CONFIG_LOCKD_V4
	153	extern struct svc_procedure nlmsvc_procedures4[];
	154	#endif
	155	extern int nlmsvc_grace_period;
	156	extern unsigned long nlmsvc_timeout;
abd1f500	157	extern int nsm_use_hostnames;
1da177e4 LT	158
	159	/*
	160	* Lockd client functions
	161	*/
92737230 TM	162	struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
	163	void nlm_release_call(struct nlm_rqst *);
	164	int nlm_async_call(struct nlm_rqst , u32, const struct rpc_call_ops );
d4716624	165	int nlm_async_reply(struct nlm_rqst , u32, const struct rpc_call_ops );
3a649b88 TM	166	struct nlm_wait * nlmclnt_prepare_block(struct nlm_host host, struct file_lock fl);
	167	void nlmclnt_finish_block(struct nlm_wait *block);
	168	int nlmclnt_block(struct nlm_wait block, struct nlm_rqst req, long timeout);
52921e02	169	__be32 nlmclnt_grant(const struct sockaddr_in addr, const struct nlm_lock );
5c8dd29c	170	void nlmclnt_recovery(struct nlm_host *);
1da177e4	171	int nlmclnt_reclaim(struct nlm_host , struct file_lock );
031d869d	172	void nlmclnt_next_cookie(struct nlm_cookie *);
1da177e4 LT	173
	174	/*
	175	* Host cache
	176	*/
eb18860e CL	177	struct nlm_host nlmclnt_lookup_host(const struct sockaddr_in sin,
	178	int proto, u32 version,
	179	const char *hostname,
	180	unsigned int hostname_len);
48df020a CL	181	struct nlm_host nlmsvc_lookup_host(struct svc_rqst , const char *,
48df020a CL	182	unsigned int);
1da177e4 LT	183	struct rpc_clnt * nlm_bind_host(struct nlm_host *);
	184	void nlm_rebind_host(struct nlm_host *);
	185	struct nlm_host * nlm_get_host(struct nlm_host *);
	186	void nlm_release_host(struct nlm_host *);
	187	void nlm_shutdown_hosts(void);
48df020a CL	188	extern void nlm_host_rebooted(const struct sockaddr_in , const char ,
48df020a CL	189	unsigned int, u32);
8dead0db	190	void nsm_release(struct nsm_handle *);
1da177e4 LT	191
1da177e4 LT	192
f2af793d OK	193	/*
	194	* This is used in garbage collection and resource reclaim
	195	* A return value != 0 means destroy the lock/block/share
	196	*/
4373ea84	197	typedef int (nlm_host_match_fn_t)(void cur, struct nlm_host *ref);
f2af793d	198
1da177e4 LT	199	/*
	200	* Server-side lock handling
	201	*/
52921e02	202	__be32 nlmsvc_lock(struct svc_rqst , struct nlm_file ,
1da177e4	203	struct nlm_lock , int, struct nlm_cookie );
52921e02	204	__be32 nlmsvc_unlock(struct nlm_file , struct nlm_lock );
85f3f1b3	205	__be32 nlmsvc_testlock(struct svc_rqst , struct nlm_file ,
8f920d5e JL	206	struct nlm_host , struct nlm_lock ,
8f920d5e JL	207	struct nlm_lock , struct nlm_cookie );
52921e02	208	__be32 nlmsvc_cancel_blocked(struct nlm_file , struct nlm_lock );
1da177e4	209	unsigned long nlmsvc_retry_blocked(void);
f3ee439f	210	void nlmsvc_traverse_blocks(struct nlm_host , struct nlm_file ,
f2af793d	211	nlm_host_match_fn_t match);
e8c5c045	212	void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
1da177e4 LT	213
	214	/*
	215	* File handling for the server personality
	216	*/
52921e02	217	__be32 nlm_lookup_file(struct svc_rqst , struct nlm_file *,
1da177e4 LT	218	struct nfs_fh *);
	219	void nlm_release_file(struct nlm_file *);
	220	void nlmsvc_mark_resources(void);
	221	void nlmsvc_free_host_resources(struct nlm_host *);
	222	void nlmsvc_invalidate_all(void);
	223
4373ea84 WC	224	/*
	225	* Cluster failover support
	226	*/
17efa372	227	int nlmsvc_unlock_all_by_sb(struct super_block *sb);
4373ea84 WC	228	int nlmsvc_unlock_all_by_ip(__be32 server_addr);
4373ea84 WC	229
f34ec991	230	static inline struct inode nlmsvc_file_inode(struct nlm_file file)
1da177e4	231	{
225a719f	232	return file->f_file->f_path.dentry->d_inode;
1da177e4 LT	233	}
	234
	235	/*
	236	* Compare two host addresses (needs modifying for ipv6)
	237	*/
f34ec991 CL	238	static inline int nlm_cmp_addr(const struct sockaddr_in *sin1,
f34ec991 CL	239	const struct sockaddr_in *sin2)
1da177e4 LT	240	{
	241	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
	242	}
	243
	244	/*
	245	* Compare two NLM locks.
	246	* When the second lock is of type F_UNLCK, this acts like a wildcard.
	247	*/
f34ec991 CL	248	static inline int nlm_compare_locks(const struct file_lock *fl1,
f34ec991 CL	249	const struct file_lock *fl2)
1da177e4 LT	250	{
1da177e4 LT	251	return fl1->fl_pid == fl2->fl_pid
3134cbec	252	&& fl1->fl_owner == fl2->fl_owner
1da177e4 LT	253	&& fl1->fl_start == fl2->fl_start
	254	&& fl1->fl_end == fl2->fl_end
	255	&&(fl1->fl_type == fl2->fl_type \|\| fl2->fl_type == F_UNLCK);
	256	}
	257
	258	extern struct lock_manager_operations nlmsvc_lock_operations;
	259
	260	#endif /* __KERNEL__ */
	261
	262	#endif /* LINUX_LOCKD_LOCKD_H */