146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*
|
|
* 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 */
|
|
enum nfs4_slot_tbl_state {
|
|
NFS4_SLOT_TBL_DRAINING,
|
|
};
|
|
|
|
#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;
|
|
unsigned long slot_tbl_state;
|
|
};
|
|
|
|
/*
|
|
* 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,
|
|
};
|
|
|
|
#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_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
|
|
|
|
static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
|
|
{
|
|
return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_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 */
|