4 * Copyright (c) 2012 Trond Myklebust <Trond.Myklebust@netapp.com>
7 #ifndef __LINUX_FS_NFS_NFS4SESSION_H
8 #define __LINUX_FS_NFS_NFS4SESSION_H
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)
16 #if IS_ENABLED(CONFIG_NFS_V4)
18 /* Sessions slot seqid */
20 struct nfs4_slot_table
*table
;
21 struct nfs4_slot
*next
;
22 unsigned long generation
;
25 unsigned int interrupted
: 1,
31 enum nfs4_slot_tbl_state
{
32 NFS4_SLOT_TBL_DRAINING
,
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 */
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
;
58 * Session related parameters
61 struct nfs4_sessionid sess_id
;
63 unsigned long session_state
;
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
;
75 enum nfs4_session_state
{
77 NFS4_SESSION_ESTABLISHED
,
80 extern int nfs4_setup_slot_table(struct nfs4_slot_table
*tbl
,
81 unsigned int max_reqs
, const char *queue
);
82 extern void nfs4_shutdown_slot_table(struct nfs4_slot_table
*tbl
);
83 extern struct nfs4_slot
*nfs4_alloc_slot(struct nfs4_slot_table
*tbl
);
84 extern struct nfs4_slot
*nfs4_lookup_slot(struct nfs4_slot_table
*tbl
, u32 slotid
);
85 extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table
*tbl
,
86 u32 slotid
, u32 seq_nr
,
87 unsigned long timeout
);
88 extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table
*tbl
, struct nfs4_slot
*slot
);
89 extern void nfs4_free_slot(struct nfs4_slot_table
*tbl
, struct nfs4_slot
*slot
);
90 extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table
*tbl
);
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
);
95 static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table
*tbl
)
97 return !!test_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
);
100 static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table
*tbl
,
103 return !!test_bit(slotid
, tbl
->used_slots
);
106 static inline struct nfs4_session
*nfs4_get_session(const struct nfs_client
*clp
)
108 return clp
->cl_session
;
111 #if defined(CONFIG_NFS_V4_1)
112 extern void nfs41_set_target_slotid(struct nfs4_slot_table
*tbl
,
113 u32 target_highest_slotid
);
114 extern void nfs41_update_target_slotid(struct nfs4_slot_table
*tbl
,
115 struct nfs4_slot
*slot
,
116 struct nfs4_sequence_res
*res
);
118 extern int nfs4_setup_session_slot_tables(struct nfs4_session
*ses
);
120 extern struct nfs4_session
*nfs4_alloc_session(struct nfs_client
*clp
);
121 extern void nfs4_destroy_session(struct nfs4_session
*session
);
122 extern int nfs4_init_session(struct nfs_client
*clp
);
123 extern int nfs4_init_ds_session(struct nfs_client
*, unsigned long);
126 * Determine if sessions are in use.
128 static inline int nfs4_has_session(const struct nfs_client
*clp
)
135 static inline int nfs4_has_persistent_session(const struct nfs_client
*clp
)
137 if (nfs4_has_session(clp
))
138 return (clp
->cl_session
->flags
& SESSION4_PERSIST
);
142 static inline void nfs4_copy_sessionid(struct nfs4_sessionid
*dst
,
143 const struct nfs4_sessionid
*src
)
145 memcpy(dst
->data
, src
->data
, NFS4_MAX_SESSIONID_LEN
);
150 * nfs_session_id_hash - calculate the crc32 hash for the session id
151 * @session - pointer to session
153 #define nfs_session_id_hash(sess_id) \
154 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
156 #define nfs_session_id_hash(session) (0)
158 #else /* defined(CONFIG_NFS_V4_1) */
160 static inline int nfs4_init_session(struct nfs_client
*clp
)
166 * Determine if sessions are in use.
168 static inline int nfs4_has_session(const struct nfs_client
*clp
)
173 static inline int nfs4_has_persistent_session(const struct nfs_client
*clp
)
178 #define nfs_session_id_hash(session) (0)
180 #endif /* defined(CONFIG_NFS_V4_1) */
181 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
182 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */