[net-next-2.6.git] / fs / nfs / nfs4_fs.h

/*
 * linux/fs/nfs/nfs4_fs.h
 *
 * Copyright (C) 2005 Trond Myklebust
 *
 * NFSv4-specific filesystem definitions and declarations
 */

#ifndef __LINUX_FS_NFS_NFS4_FS_H
#define __LINUX_FS_NFS_NFS4_FS_H

#ifdef CONFIG_NFS_V4

struct idmap;

/*
 * In a seqid-mutating op, this macro controls which error return
 * values trigger incrementation of the seqid.
 *
 * from rfc 3010:
 * The client MUST monotonically increment the sequence number for the
 * CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
 * operations.  This is true even in the event that the previous
 * operation that used the sequence number received an error.  The only
 * exception to this rule is if the previous operation received one of
 * the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
 * NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
 * NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
 *
 */
#define seqid_mutating_err(err)       \
(((err) != NFSERR_STALE_CLIENTID) &&  \
 ((err) != NFSERR_STALE_STATEID)  &&  \
 ((err) != NFSERR_BAD_STATEID)    &&  \
 ((err) != NFSERR_BAD_SEQID)      &&  \
 ((err) != NFSERR_BAD_XDR)        &&  \
 ((err) != NFSERR_RESOURCE)       &&  \
 ((err) != NFSERR_NOFILEHANDLE))

enum nfs4_client_state {
	NFS4CLNT_STATE_RECOVER  = 0,
	NFS4CLNT_LEASE_EXPIRED,
};

/*
 * struct rpc_sequence ensures that RPC calls are sent in the exact
 * order that they appear on the list.
 */
struct rpc_sequence {
	struct rpc_wait_queue	wait;	/* RPC call delay queue */
	spinlock_t lock;		/* Protects the list */
	struct list_head list;		/* Defines sequence of RPC calls */
};

#define NFS_SEQID_CONFIRMED 1
struct nfs_seqid_counter {
	struct rpc_sequence *sequence;
	int flags;
	u32 counter;
};

struct nfs_seqid {
	struct nfs_seqid_counter *sequence;
	struct list_head list;
};

static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
{
	if (seqid_mutating_err(-status))
		seqid->flags |= NFS_SEQID_CONFIRMED;
}

/*
 * NFS4 state_owners and lock_owners are simply labels for ordered
 * sequences of RPC calls. Their sole purpose is to provide once-only
 * semantics by allowing the server to identify replayed requests.
 */
struct nfs4_state_owner {
	spinlock_t	     so_lock;
	struct list_head     so_list;	 /* per-clientid list of state_owners */
	struct nfs_client    *so_client;
	u32                  so_id;      /* 32-bit identifier, unique */
	atomic_t	     so_count;

	struct rpc_cred	     *so_cred;	 /* Associated cred */
	struct list_head     so_states;
	struct list_head     so_delegations;
	struct nfs_seqid_counter so_seqid;
	struct rpc_sequence  so_sequence;
};

/*
 * struct nfs4_state maintains the client-side state for a given
 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 *
 * OPEN:
 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 * we need to know how many files are open for reading or writing on a
 * given inode. This information too is stored here.
 *
 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 */

struct nfs4_lock_state {
	struct list_head	ls_locks;	/* Other lock stateids */
	struct nfs4_state *	ls_state;	/* Pointer to open state */
	fl_owner_t		ls_owner;	/* POSIX lock owner */
#define NFS_LOCK_INITIALIZED 1
	int			ls_flags;
	struct nfs_seqid_counter	ls_seqid;
	u32			ls_id;
	nfs4_stateid		ls_stateid;
	atomic_t		ls_count;
};

/* bits for nfs4_state->flags */
enum {
	LK_STATE_IN_USE,
	NFS_DELEGATED_STATE,
};

struct nfs4_state {
	struct list_head open_states;	/* List of states for the same state_owner */
	struct list_head inode_states;	/* List of states for the same inode */
	struct list_head lock_states;	/* List of subservient lock stateids */

	struct nfs4_state_owner *owner;	/* Pointer to the open owner */
	struct inode *inode;		/* Pointer to the inode */

	unsigned long flags;		/* Do we hold any locks? */
	spinlock_t state_lock;		/* Protects the lock_states list */

	nfs4_stateid stateid;

	unsigned int n_rdonly;
	unsigned int n_wronly;
	unsigned int n_rdwr;
	int state;			/* State on the server (R,W, or RW) */
	atomic_t count;
};


struct nfs4_exception {
	long timeout;
	int retry;
};

struct nfs4_state_recovery_ops {
	int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
	int (*recover_lock)(struct nfs4_state *, struct file_lock *);
};

extern struct dentry_operations nfs4_dentry_operations;
extern const struct inode_operations nfs4_dir_inode_operations;

/* inode.c */
extern ssize_t nfs4_getxattr(struct dentry *, const char *, void *, size_t);
extern int nfs4_setxattr(struct dentry *, const char *, const void *, size_t, int);
extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);


/* nfs4proc.c */
extern int nfs4_map_errors(int err);
extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *);
extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct rpc_cred *);
extern int nfs4_proc_async_renew(struct nfs_client *, struct rpc_cred *);
extern int nfs4_proc_renew(struct nfs_client *, struct rpc_cred *);
extern int nfs4_do_close(struct path *path, struct nfs4_state *state);
extern struct dentry *nfs4_atomic_open(struct inode *, struct dentry *, struct nameidata *);
extern int nfs4_open_revalidate(struct inode *, struct dentry *, int, struct nameidata *);
extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
extern int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
		struct nfs4_fs_locations *fs_locations, struct page *page);

extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;

extern const u32 nfs4_fattr_bitmap[2];
extern const u32 nfs4_statfs_bitmap[2];
extern const u32 nfs4_pathconf_bitmap[2];
extern const u32 nfs4_fsinfo_bitmap[2];
extern const u32 nfs4_fs_locations_bitmap[2];

/* nfs4renewd.c */
extern void nfs4_schedule_state_renewal(struct nfs_client *);
extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
extern void nfs4_kill_renewd(struct nfs_client *);
extern void nfs4_renew_state(struct work_struct *);

/* nfs4state.c */
struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp);
extern u32 nfs4_alloc_lockowner_id(struct nfs_client *);

extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
extern void nfs4_put_state_owner(struct nfs4_state_owner *);
extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
extern void nfs4_put_open_state(struct nfs4_state *);
extern void nfs4_close_state(struct path *, struct nfs4_state *, mode_t);
extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
extern void nfs4_schedule_state_recovery(struct nfs_client *);
extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);

extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter);
extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
extern void nfs_free_seqid(struct nfs_seqid *seqid);

extern const nfs4_stateid zero_stateid;

/* nfs4xdr.c */
extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
extern struct rpc_procinfo nfs4_procedures[];

struct nfs4_mount_data;

/* callback_xdr.c */
extern struct svc_version nfs4_callback_version1;

#else

#define nfs4_close_state(a, b, c) do { } while (0)

#endif /* CONFIG_NFS_V4 */
#endif /* __LINUX_FS_NFS_NFS4_FS.H */
Commit	Line	Data
4ce79717 TM	1	/*
	2	* linux/fs/nfs/nfs4_fs.h
	3	*
	4	* Copyright (C) 2005 Trond Myklebust
	5	*
	6	* NFSv4-specific filesystem definitions and declarations
	7	*/
	8
	9	#ifndef __LINUX_FS_NFS_NFS4_FS_H
	10	#define __LINUX_FS_NFS_NFS4_FS_H
	11
	12	#ifdef CONFIG_NFS_V4
	13
	14	struct idmap;
	15
	16	/*
	17	* In a seqid-mutating op, this macro controls which error return
	18	* values trigger incrementation of the seqid.
	19	*
	20	* from rfc 3010:
	21	* The client MUST monotonically increment the sequence number for the
	22	* CLOSE, LOCK, LOCKU, OPEN, OPEN_CONFIRM, and OPEN_DOWNGRADE
	23	* operations. This is true even in the event that the previous
	24	* operation that used the sequence number received an error. The only
	25	* exception to this rule is if the previous operation received one of
	26	* the following errors: NFSERR_STALE_CLIENTID, NFSERR_STALE_STATEID,
	27	* NFSERR_BAD_STATEID, NFSERR_BAD_SEQID, NFSERR_BADXDR,
	28	* NFSERR_RESOURCE, NFSERR_NOFILEHANDLE.
	29	*
	30	*/
	31	#define seqid_mutating_err(err) \
	32	(((err) != NFSERR_STALE_CLIENTID) && \
	33	((err) != NFSERR_STALE_STATEID) && \
	34	((err) != NFSERR_BAD_STATEID) && \
	35	((err) != NFSERR_BAD_SEQID) && \
	36	((err) != NFSERR_BAD_XDR) && \
	37	((err) != NFSERR_RESOURCE) && \
	38	((err) != NFSERR_NOFILEHANDLE))
	39
	40	enum nfs4_client_state {
433fbe4c	41	NFS4CLNT_STATE_RECOVER = 0,
58d9714a	42	NFS4CLNT_LEASE_EXPIRED,
4ce79717 TM	43	};
4ce79717 TM	44
cee54fc9 TM	45	/*
	46	* struct rpc_sequence ensures that RPC calls are sent in the exact
	47	* order that they appear on the list.
	48	*/
	49	struct rpc_sequence {
	50	struct rpc_wait_queue wait; /* RPC call delay queue */
	51	spinlock_t lock; /* Protects the list */
	52	struct list_head list; /* Defines sequence of RPC calls */
	53	};
	54
	55	#define NFS_SEQID_CONFIRMED 1
	56	struct nfs_seqid_counter {
	57	struct rpc_sequence *sequence;
	58	int flags;
	59	u32 counter;
	60	};
	61
	62	struct nfs_seqid {
cee54fc9	63	struct nfs_seqid_counter *sequence;
4e51336a	64	struct list_head list;
cee54fc9 TM	65	};
	66
	67	static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
	68	{
	69	if (seqid_mutating_err(-status))
	70	seqid->flags \|= NFS_SEQID_CONFIRMED;
	71	}
	72
4ce79717 TM	73	/*
	74	* NFS4 state_owners and lock_owners are simply labels for ordered
	75	* sequences of RPC calls. Their sole purpose is to provide once-only
	76	* semantics by allowing the server to identify replayed requests.
4ce79717 TM	77	*/
4ce79717 TM	78	struct nfs4_state_owner {
ec073428	79	spinlock_t so_lock;
4ce79717	80	struct list_head so_list; /* per-clientid list of state_owners */
adfa6f98	81	struct nfs_client *so_client;
4ce79717	82	u32 so_id; /* 32-bit identifier, unique */
4ce79717 TM	83	atomic_t so_count;
	84
	85	struct rpc_cred so_cred; / Associated cred */
	86	struct list_head so_states;
	87	struct list_head so_delegations;
cee54fc9 TM	88	struct nfs_seqid_counter so_seqid;
cee54fc9 TM	89	struct rpc_sequence so_sequence;
4ce79717 TM	90	};
	91
	92	/*
	93	* struct nfs4_state maintains the client-side state for a given
	94	* (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
	95	*
	96	* OPEN:
	97	* In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
	98	* we need to know how many files are open for reading or writing on a
	99	* given inode. This information too is stored here.
	100	*
	101	* LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
	102	*/
	103
	104	struct nfs4_lock_state {
	105	struct list_head ls_locks; /* Other lock stateids */
8d0a8a9d	106	struct nfs4_state * ls_state; /* Pointer to open state */
4ce79717 TM	107	fl_owner_t ls_owner; /* POSIX lock owner */
	108	#define NFS_LOCK_INITIALIZED 1
	109	int ls_flags;
cee54fc9	110	struct nfs_seqid_counter ls_seqid;
4ce79717 TM	111	u32 ls_id;
	112	nfs4_stateid ls_stateid;
	113	atomic_t ls_count;
	114	};
	115
	116	/* bits for nfs4_state->flags */
	117	enum {
	118	LK_STATE_IN_USE,
	119	NFS_DELEGATED_STATE,
	120	};
	121
	122	struct nfs4_state {
	123	struct list_head open_states; /* List of states for the same state_owner */
	124	struct list_head inode_states; /* List of states for the same inode */
	125	struct list_head lock_states; /* List of subservient lock stateids */
	126
	127	struct nfs4_state_owner owner; / Pointer to the open owner */
	128	struct inode inode; / Pointer to the inode */
	129
	130	unsigned long flags; /* Do we hold any locks? */
8d0a8a9d	131	spinlock_t state_lock; /* Protects the lock_states list */
4ce79717 TM	132
	133	nfs4_stateid stateid;
	134
e7616923 TM	135	unsigned int n_rdonly;
	136	unsigned int n_wronly;
	137	unsigned int n_rdwr;
4ce79717 TM	138	int state; /* State on the server (R,W, or RW) */
	139	atomic_t count;
	140	};
	141
	142
	143	struct nfs4_exception {
	144	long timeout;
	145	int retry;
	146	};
	147
	148	struct nfs4_state_recovery_ops {
	149	int (recover_open)(struct nfs4_state_owner , struct nfs4_state *);
	150	int (recover_lock)(struct nfs4_state , struct file_lock *);
	151	};
	152
	153	extern struct dentry_operations nfs4_dentry_operations;
92e1d5be	154	extern const struct inode_operations nfs4_dir_inode_operations;
6b3b5496 BF	155
	156	/* inode.c */
	157	extern ssize_t nfs4_getxattr(struct dentry , const char , void *, size_t);
	158	extern int nfs4_setxattr(struct dentry , const char , const void *, size_t, int);
	159	extern ssize_t nfs4_listxattr(struct dentry , char , size_t);
	160
4ce79717 TM	161
	162	/* nfs4proc.c */
	163	extern int nfs4_map_errors(int err);
adfa6f98 DH	164	extern int nfs4_proc_setclientid(struct nfs_client , u32, unsigned short, struct rpc_cred );
	165	extern int nfs4_proc_setclientid_confirm(struct nfs_client , struct rpc_cred );
	166	extern int nfs4_proc_async_renew(struct nfs_client , struct rpc_cred );
	167	extern int nfs4_proc_renew(struct nfs_client , struct rpc_cred );
4a35bd41	168	extern int nfs4_do_close(struct path path, struct nfs4_state state);
02a913a7 TM	169	extern struct dentry nfs4_atomic_open(struct inode , struct dentry , struct nameidata );
02a913a7 TM	170	extern int nfs4_open_revalidate(struct inode , struct dentry , int, struct nameidata *);
55a97593	171	extern int nfs4_server_capabilities(struct nfs_server server, struct nfs_fh fhandle);
c228fd3a	172	extern int nfs4_proc_fs_locations(struct inode dir, struct qstr name,
7aaa0b3b	173	struct nfs4_fs_locations fs_locations, struct page page);
4ce79717 TM	174
	175	extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
	176	extern struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops;
	177
	178	extern const u32 nfs4_fattr_bitmap[2];
	179	extern const u32 nfs4_statfs_bitmap[2];
	180	extern const u32 nfs4_pathconf_bitmap[2];
	181	extern const u32 nfs4_fsinfo_bitmap[2];
830b8e33	182	extern const u32 nfs4_fs_locations_bitmap[2];
4ce79717 TM	183
4ce79717 TM	184	/* nfs4renewd.c */
adfa6f98	185	extern void nfs4_schedule_state_renewal(struct nfs_client *);
4ce79717	186	extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
adfa6f98	187	extern void nfs4_kill_renewd(struct nfs_client *);
65f27f38	188	extern void nfs4_renew_state(struct work_struct *);
4ce79717 TM	189
4ce79717 TM	190	/* nfs4state.c */
adfa6f98 DH	191	struct rpc_cred nfs4_get_renew_cred(struct nfs_client clp);
adfa6f98 DH	192	extern u32 nfs4_alloc_lockowner_id(struct nfs_client *);
4ce79717 TM	193
	194	extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server , struct rpc_cred );
	195	extern void nfs4_put_state_owner(struct nfs4_state_owner *);
	196	extern void nfs4_drop_state_owner(struct nfs4_state_owner *);
	197	extern struct nfs4_state * nfs4_get_open_state(struct inode , struct nfs4_state_owner );
	198	extern void nfs4_put_open_state(struct nfs4_state *);
4a35bd41	199	extern void nfs4_close_state(struct path , struct nfs4_state , mode_t);
4cecb76f	200	extern void nfs4_state_set_mode_locked(struct nfs4_state *, mode_t);
adfa6f98	201	extern void nfs4_schedule_state_recovery(struct nfs_client *);
faf5f49c	202	extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
8d0a8a9d	203	extern int nfs4_set_lock_state(struct nfs4_state state, struct file_lock fl);
4ce79717 TM	204	extern void nfs4_copy_stateid(nfs4_stateid , struct nfs4_state , fl_owner_t);
4ce79717 TM	205
cee54fc9 TM	206	extern struct nfs_seqid nfs_alloc_seqid(struct nfs_seqid_counter counter);
	207	extern int nfs_wait_on_sequence(struct nfs_seqid seqid, struct rpc_task task);
	208	extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
	209	extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
	210	extern void nfs_free_seqid(struct nfs_seqid *seqid);
	211
4ce79717 TM	212	extern const nfs4_stateid zero_stateid;
	213
	214	/* nfs4xdr.c */
0dbb4c67	215	extern __be32 nfs4_decode_dirent(__be32 p, struct nfs_entry *entry, int plus);
4ce79717 TM	216	extern struct rpc_procinfo nfs4_procedures[];
	217
	218	struct nfs4_mount_data;
	219
	220	/* callback_xdr.c */
	221	extern struct svc_version nfs4_callback_version1;
	222
	223	#else
	224
4a35bd41	225	#define nfs4_close_state(a, b, c) do { } while (0)
4ce79717 TM	226
	227	#endif /* CONFIG_NFS_V4 */
	228	#endif /* __LINUX_FS_NFS_NFS4_FS.H */