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192.168.1.100 / T800 / a9a9c63d6216da5fe76a648b0f990f7c74e4e59c / . / src / kernel / linux / v4.19 / fs / nfs / nfs4session.h
blob: 3c550f2975611945264f0dea39cbd79dbb0d8672 [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +0800[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * fs/nfs/nfs4session.h
4 *
5 * Copyright (c) 2012 Trond Myklebust <Trond.Myklebust@netapp.com>
6 *
7 */
8#ifndef __LINUX_FS_NFS_NFS4SESSION_H
9#define __LINUX_FS_NFS_NFS4SESSION_H
10
11/* maximum number of slots to use */
12#define NFS4_DEF_SLOT_TABLE_SIZE (64U)
13#define NFS4_DEF_CB_SLOT_TABLE_SIZE (1U)
14#define NFS4_MAX_SLOT_TABLE (1024U)
15#define NFS4_NO_SLOT ((u32)-1)
16
17#if IS_ENABLED(CONFIG_NFS_V4)
18
19/* Sessions slot seqid */
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 unsigned int interrupted : 1,
27 privileged : 1,
28 seq_done : 1;
29};
30
31/* Sessions */
32enum nfs4_slot_tbl_state {
33 NFS4_SLOT_TBL_DRAINING,
34};
35
36#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
37struct nfs4_slot_table {
38 struct nfs4_session *session; /* Parent session */
39 struct nfs4_slot *slots; /* seqid per slot */
40 unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
41 spinlock_t slot_tbl_lock;
42 struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */
43 wait_queue_head_t slot_waitq; /* Completion wait on slot */
44 u32 max_slots; /* # slots in table */
45 u32 max_slotid; /* Max allowed slotid value */
46 u32 highest_used_slotid; /* sent to server on each SEQ.
47 * op for dynamic resizing */
48 u32 target_highest_slotid; /* Server max_slot target */
49 u32 server_highest_slotid; /* Server highest slotid */
50 s32 d_target_highest_slotid; /* Derivative */
51 s32 d2_target_highest_slotid; /* 2nd derivative */
52 unsigned long generation; /* Generation counter for
53 target_highest_slotid */
54 struct completion complete;
55 unsigned long slot_tbl_state;
56};
57
58/*
59 * Session related parameters
60 */
61struct nfs4_session {
62 struct nfs4_sessionid sess_id;
63 u32 flags;
64 unsigned long session_state;
65 u32 hash_alg;
66 u32 ssv_len;
67
68 /* The fore and back channel */
69 struct nfs4_channel_attrs fc_attrs;
70 struct nfs4_slot_table fc_slot_table;
71 struct nfs4_channel_attrs bc_attrs;
72 struct nfs4_slot_table bc_slot_table;
73 struct nfs_client *clp;
74};
75
76enum nfs4_session_state {
77 NFS4_SESSION_INITING,
78 NFS4_SESSION_ESTABLISHED,
79};
80
81extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
82 unsigned int max_reqs, const char *queue);
83extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
84extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
85extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid);
86extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl,
87 u32 slotid, u32 seq_nr,
88 unsigned long timeout);
89extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
90extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
91extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
92bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
93 struct nfs4_slot *slot);
94void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
95
96static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
97{
98 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
99}
100
101static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl,
102 u32 slotid)
103{
104 return !!test_bit(slotid, tbl->used_slots);
105}
106
107static inline struct nfs4_session *nfs4_get_session(const struct nfs_client *clp)
108{
109 return clp->cl_session;
110}
111
112#if defined(CONFIG_NFS_V4_1)
113extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
114 u32 target_highest_slotid);
115extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
116 struct nfs4_slot *slot,
117 struct nfs4_sequence_res *res);
118
119extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
120
121extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
122extern void nfs4_destroy_session(struct nfs4_session *session);
123extern int nfs4_init_session(struct nfs_client *clp);
124extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
125
126/*
127 * Determine if sessions are in use.
128 */
129static inline int nfs4_has_session(const struct nfs_client *clp)
130{
131 if (clp->cl_session)
132 return 1;
133 return 0;
134}
135
136static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
137{
138 if (nfs4_has_session(clp))
139 return (clp->cl_session->flags & SESSION4_PERSIST);
140 return 0;
141}
142
143static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,
144 const struct nfs4_sessionid *src)
145{
146 memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN);
147}
148
149#ifdef CONFIG_CRC32
150/*
151 * nfs_session_id_hash - calculate the crc32 hash for the session id
152 * @session - pointer to session
153 */
154#define nfs_session_id_hash(sess_id) \
155 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
156#else
157#define nfs_session_id_hash(session) (0)
158#endif
159#else /* defined(CONFIG_NFS_V4_1) */
160
161static inline int nfs4_init_session(struct nfs_client *clp)
162{
163 return 0;
164}
165
166/*
167 * Determine if sessions are in use.
168 */
169static inline int nfs4_has_session(const struct nfs_client *clp)
170{
171 return 0;
172}
173
174static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
175{
176 return 0;
177}
178
179#define nfs_session_id_hash(session) (0)
180
181#endif /* defined(CONFIG_NFS_V4_1) */
182#endif /* IS_ENABLED(CONFIG_NFS_V4) */
183#endif /* __LINUX_FS_NFS_NFS4SESSION_H */