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8#ifndef __LINUX_FS_NFS_NFS4SESSION_H
9#define __LINUX_FS_NFS_NFS4SESSION_H
10
11
12#define NFS4_DEF_SLOT_TABLE_SIZE (64U)
13#define NFS4_DEF_CB_SLOT_TABLE_SIZE (16U)
14#define NFS4_MAX_SLOT_TABLE (1024U)
15#define NFS4_NO_SLOT ((u32)-1)
16
17#if IS_ENABLED(CONFIG_NFS_V4)
18
19
20struct nfs4_slot {
21 struct nfs4_slot_table *table;
22 struct nfs4_slot *next;
23 unsigned long generation;
24 u32 slot_nr;
25 u32 seq_nr;
26 u32 seq_nr_last_acked;
27 u32 seq_nr_highest_sent;
28 unsigned int privileged : 1,
29 seq_done : 1;
30};
31
32
33enum nfs4_slot_tbl_state {
34 NFS4_SLOT_TBL_DRAINING,
35};
36
37#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
38struct nfs4_slot_table {
39 struct nfs4_session *session;
40 struct nfs4_slot *slots;
41 unsigned long used_slots[SLOT_TABLE_SZ];
42 spinlock_t slot_tbl_lock;
43 struct rpc_wait_queue slot_tbl_waitq;
44 wait_queue_head_t slot_waitq;
45 u32 max_slots;
46 u32 max_slotid;
47 u32 highest_used_slotid;
48
49 u32 target_highest_slotid;
50 u32 server_highest_slotid;
51 s32 d_target_highest_slotid;
52 s32 d2_target_highest_slotid;
53 unsigned long generation;
54
55 struct completion complete;
56 unsigned long slot_tbl_state;
57};
58
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61
62struct nfs4_session {
63 struct nfs4_sessionid sess_id;
64 u32 flags;
65 unsigned long session_state;
66 u32 hash_alg;
67 u32 ssv_len;
68
69
70 struct nfs4_channel_attrs fc_attrs;
71 struct nfs4_slot_table fc_slot_table;
72 struct nfs4_channel_attrs bc_attrs;
73 struct nfs4_slot_table bc_slot_table;
74 struct nfs_client *clp;
75};
76
77enum nfs4_session_state {
78 NFS4_SESSION_INITING,
79 NFS4_SESSION_ESTABLISHED,
80};
81
82extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
83 unsigned int max_reqs, const char *queue);
84extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
85extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
86extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid);
87extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl,
88 u32 slotid, u32 seq_nr,
89 unsigned long timeout);
90extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
91extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
92extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
93bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
94 struct nfs4_slot *slot);
95void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
96
97static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
98{
99 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
100}
101
102static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl,
103 u32 slotid)
104{
105 return !!test_bit(slotid, tbl->used_slots);
106}
107
108static inline struct nfs4_session *nfs4_get_session(const struct nfs_client *clp)
109{
110 return clp->cl_session;
111}
112
113#if defined(CONFIG_NFS_V4_1)
114extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
115 u32 target_highest_slotid);
116extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
117 struct nfs4_slot *slot,
118 struct nfs4_sequence_res *res);
119
120extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
121
122extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
123extern void nfs4_destroy_session(struct nfs4_session *session);
124extern int nfs4_init_session(struct nfs_client *clp);
125extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
126
127
128
129
130static inline int nfs4_has_session(const struct nfs_client *clp)
131{
132 if (clp->cl_session)
133 return 1;
134 return 0;
135}
136
137static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
138{
139 if (nfs4_has_session(clp))
140 return (clp->cl_session->flags & SESSION4_PERSIST);
141 return 0;
142}
143
144static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,
145 const struct nfs4_sessionid *src)
146{
147 memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN);
148}
149
150#ifdef CONFIG_CRC32
151
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154
155#define nfs_session_id_hash(sess_id) \
156 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
157#else
158#define nfs_session_id_hash(session) (0)
159#endif
160#else
161
162static inline int nfs4_init_session(struct nfs_client *clp)
163{
164 return 0;
165}
166
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169
170static inline int nfs4_has_session(const struct nfs_client *clp)
171{
172 return 0;
173}
174
175static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
176{
177 return 0;
178}
179
180#define nfs_session_id_hash(session) (0)
181
182#endif
183#endif
184#endif
185
