linux/fs/nfs/nfs4session.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * fs/nfs/nfs4session.h
 *
 * Copyright (c) 2012 Trond Myklebust <[email protected]>
 *
 */
#ifndef __LINUX_FS_NFS_NFS4SESSION_H
#define __LINUX_FS_NFS_NFS4SESSION_H

/* maximum number of slots to use */
#define NFS4_DEF_SLOT_TABLE_SIZE …
#define NFS4_DEF_CB_SLOT_TABLE_SIZE …
#define NFS4_MAX_SLOT_TABLE …
#define NFS4_MAX_SLOTID …
#define NFS4_NO_SLOT …

#if IS_ENABLED(CONFIG_NFS_V4)

/* Sessions slot seqid */
struct nfs4_slot { … };

/* Sessions */
enum nfs4_slot_tbl_state { … };

#define SLOT_TABLE_SZ …
struct nfs4_slot_table { … };

/*
 * Session related parameters
 */
struct nfs4_session { … };

enum nfs4_session_state { … };

extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
		unsigned int max_reqs, const char *queue);
extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid);
extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl,
		u32 slotid, u32 seq_nr,
		unsigned long timeout);
extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
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);

static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
{ … }

static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl,
		u32 slotid)
{ … }

static inline struct nfs4_session *nfs4_get_session(const struct nfs_client *clp)
{ … }

#if defined(CONFIG_NFS_V4_1)
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_client *clp);
extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);

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

static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
{ … }

static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,
		const struct nfs4_sessionid *src)
{ … }

#ifdef CONFIG_CRC32
/*
 * nfs_session_id_hash - calculate the crc32 hash for the session id
 * @session - pointer to session
 */
#define nfs_session_id_hash(sess_id) …
#else
#define nfs_session_id_hash …
#endif
#else /* defined(CONFIG_NFS_V4_1) */

static inline int nfs4_init_session(struct nfs_client *clp)
{
	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;
}

#define nfs_session_id_hash …

#endif /* defined(CONFIG_NFS_V4_1) */
#endif /* IS_ENABLED(CONFIG_NFS_V4) */
#endif /* __LINUX_FS_NFS_NFS4SESSION_H */