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73e39aaa TM |
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 | ||
76e697ba | 10 | /* maximum number of slots to use */ |
bc4b2a86 | 11 | #define NFS4_DEF_SLOT_TABLE_SIZE (64U) |
5405fc44 | 12 | #define NFS4_DEF_CB_SLOT_TABLE_SIZE (1U) |
0ca3f482 | 13 | #define NFS4_MAX_SLOT_TABLE (1024U) |
76e697ba TM |
14 | #define NFS4_NO_SLOT ((u32)-1) |
15 | ||
16 | #if IS_ENABLED(CONFIG_NFS_V4) | |
17 | ||
18 | /* Sessions slot seqid */ | |
19 | struct nfs4_slot { | |
20 | struct nfs4_slot_table *table; | |
21 | struct nfs4_slot *next; | |
22 | unsigned long generation; | |
76e697ba TM |
23 | u32 slot_nr; |
24 | u32 seq_nr; | |
07e8dcbd | 25 | unsigned int interrupted : 1, |
0a014a44 | 26 | privileged : 1, |
07e8dcbd | 27 | seq_done : 1; |
76e697ba TM |
28 | }; |
29 | ||
30 | /* Sessions */ | |
774d5f14 AA |
31 | enum nfs4_slot_tbl_state { |
32 | NFS4_SLOT_TBL_DRAINING, | |
33 | }; | |
34 | ||
76e697ba TM |
35 | #define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long)) |
36 | struct 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 */ | |
045d2a6d | 42 | wait_queue_head_t slot_waitq; /* Completion wait on slot */ |
76e697ba TM |
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 */ | |
1fa80644 TM |
49 | s32 d_target_highest_slotid; /* Derivative */ |
50 | s32 d2_target_highest_slotid; /* 2nd derivative */ | |
76e697ba TM |
51 | unsigned long generation; /* Generation counter for |
52 | target_highest_slotid */ | |
53 | struct completion complete; | |
774d5f14 | 54 | unsigned long slot_tbl_state; |
76e697ba TM |
55 | }; |
56 | ||
57 | /* | |
58 | * Session related parameters | |
59 | */ | |
60 | struct 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; | |
76e697ba TM |
73 | }; |
74 | ||
75 | enum nfs4_session_state { | |
76 | NFS4_SESSION_INITING, | |
e11259f9 | 77 | NFS4_SESSION_ESTABLISHED, |
76e697ba TM |
78 | }; |
79 | ||
744aa525 CL |
80 | extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, |
81 | unsigned int max_reqs, const char *queue); | |
20b9a902 | 82 | extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl); |
73e39aaa | 83 | extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); |
810d82e6 | 84 | extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid); |
045d2a6d TM |
85 | extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl, |
86 | u32 slotid, u32 seq_nr, | |
87 | unsigned long timeout); | |
810d82e6 | 88 | extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); |
73e39aaa | 89 | extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); |
9d33059c | 90 | extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl); |
9d33059c CL |
91 | bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, |
92 | struct nfs4_slot *slot); | |
93 | void nfs41_wake_slot_table(struct nfs4_slot_table *tbl); | |
94 | ||
95 | static 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 | ||
810d82e6 TM |
100 | static 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 | ||
9d33059c CL |
106 | #if defined(CONFIG_NFS_V4_1) |
107 | extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, | |
108 | u32 target_highest_slotid); | |
1cec16ab CL |
109 | extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, |
110 | struct nfs4_slot *slot, | |
111 | struct nfs4_sequence_res *res); | |
73e39aaa TM |
112 | |
113 | extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); | |
114 | ||
115 | extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); | |
116 | extern void nfs4_destroy_session(struct nfs4_session *session); | |
18aad3d5 | 117 | extern int nfs4_init_session(struct nfs_client *clp); |
73e39aaa TM |
118 | extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); |
119 | ||
76e697ba TM |
120 | /* |
121 | * Determine if sessions are in use. | |
122 | */ | |
123 | static inline int nfs4_has_session(const struct nfs_client *clp) | |
124 | { | |
125 | if (clp->cl_session) | |
126 | return 1; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static inline int nfs4_has_persistent_session(const struct nfs_client *clp) | |
131 | { | |
132 | if (nfs4_has_session(clp)) | |
133 | return (clp->cl_session->flags & SESSION4_PERSIST); | |
134 | return 0; | |
135 | } | |
136 | ||
79969dd1 TM |
137 | static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst, |
138 | const struct nfs4_sessionid *src) | |
139 | { | |
140 | memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN); | |
141 | } | |
142 | ||
2f92ae34 TM |
143 | #ifdef CONFIG_CRC32 |
144 | /* | |
145 | * nfs_session_id_hash - calculate the crc32 hash for the session id | |
146 | * @session - pointer to session | |
147 | */ | |
148 | #define nfs_session_id_hash(sess_id) \ | |
149 | (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data))) | |
150 | #else | |
151 | #define nfs_session_id_hash(session) (0) | |
152 | #endif | |
73e39aaa TM |
153 | #else /* defined(CONFIG_NFS_V4_1) */ |
154 | ||
18aad3d5 | 155 | static inline int nfs4_init_session(struct nfs_client *clp) |
73e39aaa TM |
156 | { |
157 | return 0; | |
158 | } | |
159 | ||
76e697ba TM |
160 | /* |
161 | * Determine if sessions are in use. | |
162 | */ | |
163 | static inline int nfs4_has_session(const struct nfs_client *clp) | |
164 | { | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static inline int nfs4_has_persistent_session(const struct nfs_client *clp) | |
169 | { | |
170 | return 0; | |
171 | } | |
172 | ||
73e39aaa | 173 | #endif /* defined(CONFIG_NFS_V4_1) */ |
76e697ba | 174 | #endif /* IS_ENABLED(CONFIG_NFS_V4) */ |
73e39aaa | 175 | #endif /* __LINUX_FS_NFS_NFS4SESSION_H */ |