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Linux kernel mirror (for testing)
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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 (64U)
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 */
28enum nfs4_slot_tbl_state {
29 NFS4_SLOT_TBL_DRAINING,
30};
31
32#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
33struct nfs4_slot_table {
34 struct nfs4_session *session; /* Parent session */
35 struct nfs4_slot *slots; /* seqid per slot */
36 unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
37 spinlock_t slot_tbl_lock;
38 struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */
39 u32 max_slots; /* # slots in table */
40 u32 max_slotid; /* Max allowed slotid value */
41 u32 highest_used_slotid; /* sent to server on each SEQ.
42 * op for dynamic resizing */
43 u32 target_highest_slotid; /* Server max_slot target */
44 u32 server_highest_slotid; /* Server highest slotid */
45 s32 d_target_highest_slotid; /* Derivative */
46 s32 d2_target_highest_slotid; /* 2nd derivative */
47 unsigned long generation; /* Generation counter for
48 target_highest_slotid */
49 struct completion complete;
50 unsigned long slot_tbl_state;
51};
52
53/*
54 * Session related parameters
55 */
56struct nfs4_session {
57 struct nfs4_sessionid sess_id;
58 u32 flags;
59 unsigned long session_state;
60 u32 hash_alg;
61 u32 ssv_len;
62
63 /* The fore and back channel */
64 struct nfs4_channel_attrs fc_attrs;
65 struct nfs4_slot_table fc_slot_table;
66 struct nfs4_channel_attrs bc_attrs;
67 struct nfs4_slot_table bc_slot_table;
68 struct nfs_client *clp;
69};
70
71enum nfs4_session_state {
72 NFS4_SESSION_INITING,
73};
74
75extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
76 unsigned int max_reqs, const char *queue);
77extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
78extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
79extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
80extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
81bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
82 struct nfs4_slot *slot);
83void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
84
85static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
86{
87 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
88}
89
90#if defined(CONFIG_NFS_V4_1)
91extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
92 u32 target_highest_slotid);
93extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
94 struct nfs4_slot *slot,
95 struct nfs4_sequence_res *res);
96
97extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
98
99extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
100extern void nfs4_destroy_session(struct nfs4_session *session);
101extern int nfs4_init_session(struct nfs_client *clp);
102extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
103
104/*
105 * Determine if sessions are in use.
106 */
107static inline int nfs4_has_session(const struct nfs_client *clp)
108{
109 if (clp->cl_session)
110 return 1;
111 return 0;
112}
113
114static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
115{
116 if (nfs4_has_session(clp))
117 return (clp->cl_session->flags & SESSION4_PERSIST);
118 return 0;
119}
120
121#ifdef CONFIG_CRC32
122/*
123 * nfs_session_id_hash - calculate the crc32 hash for the session id
124 * @session - pointer to session
125 */
126#define nfs_session_id_hash(sess_id) \
127 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
128#else
129#define nfs_session_id_hash(session) (0)
130#endif
131#else /* defined(CONFIG_NFS_V4_1) */
132
133static inline int nfs4_init_session(struct nfs_client *clp)
134{
135 return 0;
136}
137
138/*
139 * Determine if sessions are in use.
140 */
141static inline int nfs4_has_session(const struct nfs_client *clp)
142{
143 return 0;
144}
145
146static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
147{
148 return 0;
149}
150
151#endif /* defined(CONFIG_NFS_V4_1) */
152#endif /* IS_ENABLED(CONFIG_NFS_V4) */
153#endif /* __LINUX_FS_NFS_NFS4SESSION_H */