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Linux kernel mirror (for testing)
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linux
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
10/* maximum number of slots to use */
11#define NFS4_DEF_SLOT_TABLE_SIZE (16U)
12#define NFS4_MAX_SLOT_TABLE (1024U)
13#define NFS4_NO_SLOT ((u32)-1)
14
15#if IS_ENABLED(CONFIG_NFS_V4)
16
17/* Sessions slot seqid */
18struct nfs4_slot {
19 struct nfs4_slot_table *table;
20 struct nfs4_slot *next;
21 unsigned long generation;
22 u32 slot_nr;
23 u32 seq_nr;
24 unsigned int interrupted : 1;
25};
26
27/* Sessions */
28#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
29struct 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 */
41 s32 d_target_highest_slotid; /* Derivative */
42 s32 d2_target_highest_slotid; /* 2nd derivative */
43 unsigned long generation; /* Generation counter for
44 target_highest_slotid */
45 struct completion complete;
46};
47
48/*
49 * Session related parameters
50 */
51struct 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
69enum nfs4_session_state {
70 NFS4_SESSION_INITING,
71 NFS4_SESSION_DRAINING,
72};
73
74#if defined(CONFIG_NFS_V4_1)
75extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
76extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
77
78extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
79 u32 target_highest_slotid);
80extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
81 struct nfs4_slot *slot,
82 struct nfs4_sequence_res *res);
83
84extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
85
86extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
87extern void nfs4_destroy_session(struct nfs4_session *session);
88extern int nfs4_init_session(struct nfs_server *server);
89extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
90
91extern void nfs4_session_drain_complete(struct nfs4_session *session,
92 struct nfs4_slot_table *tbl);
93
94static inline bool nfs4_session_draining(struct nfs4_session *session)
95{
96 return !!test_bit(NFS4_SESSION_DRAINING, &session->session_state);
97}
98
99bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
100 struct nfs4_slot *slot);
101void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
102
103/*
104 * Determine if sessions are in use.
105 */
106static inline int nfs4_has_session(const struct nfs_client *clp)
107{
108 if (clp->cl_session)
109 return 1;
110 return 0;
111}
112
113static 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
120#else /* defined(CONFIG_NFS_V4_1) */
121
122static inline int nfs4_init_session(struct nfs_server *server)
123{
124 return 0;
125}
126
127/*
128 * Determine if sessions are in use.
129 */
130static inline int nfs4_has_session(const struct nfs_client *clp)
131{
132 return 0;
133}
134
135static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
136{
137 return 0;
138}
139
140#endif /* defined(CONFIG_NFS_V4_1) */
141#endif /* IS_ENABLED(CONFIG_NFS_V4) */
142#endif /* __LINUX_FS_NFS_NFS4SESSION_H */