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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 (64U)
12#define NFS4_DEF_CB_SLOT_TABLE_SIZE (1U)
13#define NFS4_MAX_SLOT_TABLE (1024U)
14#define NFS4_NO_SLOT ((u32)-1)
15
16#if IS_ENABLED(CONFIG_NFS_V4)
17
18/* Sessions slot seqid */
19struct nfs4_slot {
20 struct nfs4_slot_table *table;
21 struct nfs4_slot *next;
22 unsigned long generation;
23 u32 slot_nr;
24 u32 seq_nr;
25 unsigned int interrupted : 1,
26 privileged : 1,
27 seq_done : 1;
28};
29
30/* Sessions */
31enum nfs4_slot_tbl_state {
32 NFS4_SLOT_TBL_DRAINING,
33};
34
35#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
36struct nfs4_slot_table {
37 struct nfs4_session *session; /* Parent session */
38 struct nfs4_slot *slots; /* seqid per slot */
39 unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
40 spinlock_t slot_tbl_lock;
41 struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */
42 wait_queue_head_t slot_waitq; /* Completion wait on slot */
43 u32 max_slots; /* # slots in table */
44 u32 max_slotid; /* Max allowed slotid value */
45 u32 highest_used_slotid; /* sent to server on each SEQ.
46 * op for dynamic resizing */
47 u32 target_highest_slotid; /* Server max_slot target */
48 u32 server_highest_slotid; /* Server highest slotid */
49 s32 d_target_highest_slotid; /* Derivative */
50 s32 d2_target_highest_slotid; /* 2nd derivative */
51 unsigned long generation; /* Generation counter for
52 target_highest_slotid */
53 struct completion complete;
54 unsigned long slot_tbl_state;
55};
56
57/*
58 * Session related parameters
59 */
60struct nfs4_session {
61 struct nfs4_sessionid sess_id;
62 u32 flags;
63 unsigned long session_state;
64 u32 hash_alg;
65 u32 ssv_len;
66
67 /* The fore and back channel */
68 struct nfs4_channel_attrs fc_attrs;
69 struct nfs4_slot_table fc_slot_table;
70 struct nfs4_channel_attrs bc_attrs;
71 struct nfs4_slot_table bc_slot_table;
72 struct nfs_client *clp;
73};
74
75enum nfs4_session_state {
76 NFS4_SESSION_INITING,
77 NFS4_SESSION_ESTABLISHED,
78};
79
80extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
81 unsigned int max_reqs, const char *queue);
82extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
83extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
84extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid);
85extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl,
86 u32 slotid, u32 seq_nr,
87 unsigned long timeout);
88extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
89extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
90extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
91bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
92 struct nfs4_slot *slot);
93void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
94
95static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
96{
97 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
98}
99
100static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl,
101 u32 slotid)
102{
103 return !!test_bit(slotid, tbl->used_slots);
104}
105
106static inline struct nfs4_session *nfs4_get_session(const struct nfs_client *clp)
107{
108 return clp->cl_session;
109}
110
111#if defined(CONFIG_NFS_V4_1)
112extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
113 u32 target_highest_slotid);
114extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
115 struct nfs4_slot *slot,
116 struct nfs4_sequence_res *res);
117
118extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
119
120extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
121extern void nfs4_destroy_session(struct nfs4_session *session);
122extern int nfs4_init_session(struct nfs_client *clp);
123extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
124
125/*
126 * Determine if sessions are in use.
127 */
128static inline int nfs4_has_session(const struct nfs_client *clp)
129{
130 if (clp->cl_session)
131 return 1;
132 return 0;
133}
134
135static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
136{
137 if (nfs4_has_session(clp))
138 return (clp->cl_session->flags & SESSION4_PERSIST);
139 return 0;
140}
141
142static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,
143 const struct nfs4_sessionid *src)
144{
145 memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN);
146}
147
148#ifdef CONFIG_CRC32
149/*
150 * nfs_session_id_hash - calculate the crc32 hash for the session id
151 * @session - pointer to session
152 */
153#define nfs_session_id_hash(sess_id) \
154 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
155#else
156#define nfs_session_id_hash(session) (0)
157#endif
158#else /* defined(CONFIG_NFS_V4_1) */
159
160static inline int nfs4_init_session(struct nfs_client *clp)
161{
162 return 0;
163}
164
165/*
166 * Determine if sessions are in use.
167 */
168static inline int nfs4_has_session(const struct nfs_client *clp)
169{
170 return 0;
171}
172
173static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
174{
175 return 0;
176}
177
178#define nfs_session_id_hash(session) (0)
179
180#endif /* defined(CONFIG_NFS_V4_1) */
181#endif /* IS_ENABLED(CONFIG_NFS_V4) */
182#endif /* __LINUX_FS_NFS_NFS4SESSION_H */