Merge tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[deliverable/linux.git] / fs / nfs / nfs4session.h
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 */
18 struct 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 */
28 enum 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))
33 struct 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 */
56 struct 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
71 enum nfs4_session_state {
72 NFS4_SESSION_INITING,
73 NFS4_SESSION_ESTABLISHED,
74 };
75
76 extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl,
77 unsigned int max_reqs, const char *queue);
78 extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl);
79 extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
80 extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
81 extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
82 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
83 struct nfs4_slot *slot);
84 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
85
86 static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
87 {
88 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
89 }
90
91 #if defined(CONFIG_NFS_V4_1)
92 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
93 u32 target_highest_slotid);
94 extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
95 struct nfs4_slot *slot,
96 struct nfs4_sequence_res *res);
97
98 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
99
100 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
101 extern void nfs4_destroy_session(struct nfs4_session *session);
102 extern int nfs4_init_session(struct nfs_client *clp);
103 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
104
105 /*
106 * Determine if sessions are in use.
107 */
108 static inline int nfs4_has_session(const struct nfs_client *clp)
109 {
110 if (clp->cl_session)
111 return 1;
112 return 0;
113 }
114
115 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
116 {
117 if (nfs4_has_session(clp))
118 return (clp->cl_session->flags & SESSION4_PERSIST);
119 return 0;
120 }
121
122 static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst,
123 const struct nfs4_sessionid *src)
124 {
125 memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN);
126 }
127
128 #ifdef CONFIG_CRC32
129 /*
130 * nfs_session_id_hash - calculate the crc32 hash for the session id
131 * @session - pointer to session
132 */
133 #define nfs_session_id_hash(sess_id) \
134 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
135 #else
136 #define nfs_session_id_hash(session) (0)
137 #endif
138 #else /* defined(CONFIG_NFS_V4_1) */
139
140 static inline int nfs4_init_session(struct nfs_client *clp)
141 {
142 return 0;
143 }
144
145 /*
146 * Determine if sessions are in use.
147 */
148 static inline int nfs4_has_session(const struct nfs_client *clp)
149 {
150 return 0;
151 }
152
153 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
154 {
155 return 0;
156 }
157
158 #endif /* defined(CONFIG_NFS_V4_1) */
159 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
160 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */
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