[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfs / nfs4session.h

/*
 * fs/nfs/nfs4session.h
 *
 * Copyright (c) 2012 Trond Myklebust <Trond.Myklebust@netapp.com>
 *
 */
#ifndef __LINUX_FS_NFS_NFS4SESSION_H
#define __LINUX_FS_NFS_NFS4SESSION_H

/* maximum number of slots to use */
#define NFS4_DEF_SLOT_TABLE_SIZE (16U)
#define NFS4_MAX_SLOT_TABLE (1024U)
#define NFS4_NO_SLOT ((u32)-1)

#if IS_ENABLED(CONFIG_NFS_V4)

/* Sessions slot seqid */
struct nfs4_slot {
	struct nfs4_slot_table	*table;
	struct nfs4_slot	*next;
	unsigned long		generation;
	u32			slot_nr;
	u32		 	seq_nr;
	unsigned int		interrupted : 1;
};

/* Sessions */
#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
struct nfs4_slot_table {
	struct nfs4_session *session;		/* Parent session */
	struct nfs4_slot *slots;		/* seqid per slot */
	unsigned long   used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
	spinlock_t	slot_tbl_lock;
	struct rpc_wait_queue	slot_tbl_waitq;	/* allocators may wait here */
	u32		max_slots;		/* # slots in table */
	u32		max_slotid;		/* Max allowed slotid value */
	u32		highest_used_slotid;	/* sent to server on each SEQ.
						 * op for dynamic resizing */
	u32		target_highest_slotid;	/* Server max_slot target */
	u32		server_highest_slotid;	/* Server highest slotid */
	s32		d_target_highest_slotid; /* Derivative */
	s32		d2_target_highest_slotid; /* 2nd derivative */
	unsigned long	generation;		/* Generation counter for
						   target_highest_slotid */
	struct completion complete;
};

/*
 * Session related parameters
 */
struct nfs4_session {
	struct nfs4_sessionid		sess_id;
	u32				flags;
	unsigned long			session_state;
	u32				hash_alg;
	u32				ssv_len;

	/* The fore and back channel */
	struct nfs4_channel_attrs	fc_attrs;
	struct nfs4_slot_table		fc_slot_table;
	struct nfs4_channel_attrs	bc_attrs;
	struct nfs4_slot_table		bc_slot_table;
	struct nfs_client		*clp;
	/* Create session arguments */
	unsigned int			fc_target_max_rqst_sz;
	unsigned int			fc_target_max_resp_sz;
};

enum nfs4_session_state {
	NFS4_SESSION_INITING,
	NFS4_SESSION_DRAINING,
};

#if defined(CONFIG_NFS_V4_1)
extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);

extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
		u32 target_highest_slotid);
extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
		struct nfs4_slot *slot,
		struct nfs4_sequence_res *res);

extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);

extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
extern void nfs4_destroy_session(struct nfs4_session *session);
extern int nfs4_init_session(struct nfs_server *server);
extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);

extern void nfs4_session_drain_complete(struct nfs4_session *session,
		struct nfs4_slot_table *tbl);

static inline bool nfs4_session_draining(struct nfs4_session *session)
{
	return !!test_bit(NFS4_SESSION_DRAINING, &session->session_state);
}

bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
		struct nfs4_slot *slot);
void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);

/*
 * Determine if sessions are in use.
 */
static inline int nfs4_has_session(const struct nfs_client *clp)
{
	if (clp->cl_session)
		return 1;
	return 0;
}

static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
{
	if (nfs4_has_session(clp))
		return (clp->cl_session->flags & SESSION4_PERSIST);
	return 0;
}

#else /* defined(CONFIG_NFS_V4_1) */

static inline int nfs4_init_session(struct nfs_server *server)
{
	return 0;
}

/*
 * Determine if sessions are in use.
 */
static inline int nfs4_has_session(const struct nfs_client *clp)
{
	return 0;
}

static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
{
	return 0;
}

#endif /* defined(CONFIG_NFS_V4_1) */
#endif /* IS_ENABLED(CONFIG_NFS_V4) */
#endif /* __LINUX_FS_NFS_NFS4SESSION_H */
Commit	Line	Data
73e39aaa TM	1	/*
	2	* fs/nfs/nfs4session.h
	3	*
	4	* Copyright (c) 2012 Trond Myklebust <Trond.Myklebust@netapp.com>
	5	*
	6	*/
	7	#ifndef __LINUX_FS_NFS_NFS4SESSION_H
	8	#define __LINUX_FS_NFS_NFS4SESSION_H
	9
76e697ba TM	10	/* maximum number of slots to use */
76e697ba TM	11	#define NFS4_DEF_SLOT_TABLE_SIZE (16U)
0ca3f482	12	#define NFS4_MAX_SLOT_TABLE (1024U)
76e697ba TM	13	#define NFS4_NO_SLOT ((u32)-1)
	14
	15	#if IS_ENABLED(CONFIG_NFS_V4)
	16
	17	/* Sessions slot seqid */
	18	struct nfs4_slot {
	19	struct nfs4_slot_table *table;
	20	struct nfs4_slot *next;
	21	unsigned long generation;
76e697ba TM	22	u32 slot_nr;
76e697ba TM	23	u32 seq_nr;
ac20d163	24	unsigned int interrupted : 1;
76e697ba TM	25	};
	26
	27	/* Sessions */
	28	#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
	29	struct nfs4_slot_table {
	30	struct nfs4_session session; / Parent session */
	31	struct nfs4_slot slots; / seqid per slot */
	32	unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
	33	spinlock_t slot_tbl_lock;
	34	struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */
	35	u32 max_slots; /* # slots in table */
	36	u32 max_slotid; /* Max allowed slotid value */
	37	u32 highest_used_slotid; /* sent to server on each SEQ.
	38	* op for dynamic resizing */
	39	u32 target_highest_slotid; /* Server max_slot target */
	40	u32 server_highest_slotid; /* Server highest slotid */
1fa80644 TM	41	s32 d_target_highest_slotid; /* Derivative */
1fa80644 TM	42	s32 d2_target_highest_slotid; /* 2nd derivative */
76e697ba TM	43	unsigned long generation; /* Generation counter for
	44	target_highest_slotid */
	45	struct completion complete;
	46	};
	47
	48	/*
	49	* Session related parameters
	50	*/
	51	struct nfs4_session {
	52	struct nfs4_sessionid sess_id;
	53	u32 flags;
	54	unsigned long session_state;
	55	u32 hash_alg;
	56	u32 ssv_len;
	57
	58	/* The fore and back channel */
	59	struct nfs4_channel_attrs fc_attrs;
	60	struct nfs4_slot_table fc_slot_table;
	61	struct nfs4_channel_attrs bc_attrs;
	62	struct nfs4_slot_table bc_slot_table;
	63	struct nfs_client *clp;
	64	/* Create session arguments */
	65	unsigned int fc_target_max_rqst_sz;
	66	unsigned int fc_target_max_resp_sz;
	67	};
	68
	69	enum nfs4_session_state {
	70	NFS4_SESSION_INITING,
	71	NFS4_SESSION_DRAINING,
	72	};
	73
73e39aaa TM	74	#if defined(CONFIG_NFS_V4_1)
	75	extern struct nfs4_slot nfs4_alloc_slot(struct nfs4_slot_table tbl);
	76	extern void nfs4_free_slot(struct nfs4_slot_table tbl, struct nfs4_slot slot);
	77
	78	extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
	79	u32 target_highest_slotid);
	80	extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
	81	struct nfs4_slot *slot,
	82	struct nfs4_sequence_res *res);
	83
	84	extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
	85
	86	extern struct nfs4_session nfs4_alloc_session(struct nfs_client clp);
	87	extern void nfs4_destroy_session(struct nfs4_session *session);
	88	extern int nfs4_init_session(struct nfs_server *server);
	89	extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
	90
76e697ba TM	91	extern void nfs4_session_drain_complete(struct nfs4_session *session,
	92	struct nfs4_slot_table *tbl);
	93
	94	static inline bool nfs4_session_draining(struct nfs4_session *session)
	95	{
	96	return !!test_bit(NFS4_SESSION_DRAINING, &session->session_state);
	97	}
	98
b75ad4cd TM	99	bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
	100	struct nfs4_slot *slot);
	101	void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
	102
76e697ba TM	103	/*
	104	* Determine if sessions are in use.
	105	*/
	106	static inline int nfs4_has_session(const struct nfs_client *clp)
	107	{
	108	if (clp->cl_session)
	109	return 1;
	110	return 0;
	111	}
	112
	113	static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
	114	{
	115	if (nfs4_has_session(clp))
	116	return (clp->cl_session->flags & SESSION4_PERSIST);
	117	return 0;
	118	}
	119
73e39aaa TM	120	#else /* defined(CONFIG_NFS_V4_1) */
	121
	122	static inline int nfs4_init_session(struct nfs_server *server)
	123	{
	124	return 0;
	125	}
	126
76e697ba TM	127	/*
	128	* Determine if sessions are in use.
	129	*/
	130	static inline int nfs4_has_session(const struct nfs_client *clp)
	131	{
	132	return 0;
	133	}
	134
	135	static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
	136	{
	137	return 0;
	138	}
	139
73e39aaa	140	#endif /* defined(CONFIG_NFS_V4_1) */
76e697ba	141	#endif /* IS_ENABLED(CONFIG_NFS_V4) */
73e39aaa	142	#endif /* __LINUX_FS_NFS_NFS4SESSION_H */