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 (16U)
12 #define NFS4_MAX_SLOT_TABLE (1024U)
13 #define NFS4_NO_SLOT ((u32)-1)
15 #if IS_ENABLED(CONFIG_NFS_V4)
17 /* Sessions slot seqid */
19 struct nfs4_slot_table *table;
20 struct nfs4_slot *next;
21 unsigned long generation;
27 #define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
28 struct nfs4_slot_table {
29 struct nfs4_session *session; /* Parent session */
30 struct nfs4_slot *slots; /* seqid per slot */
31 unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
32 spinlock_t slot_tbl_lock;
33 struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */
34 u32 max_slots; /* # slots in table */
35 u32 max_slotid; /* Max allowed slotid value */
36 u32 highest_used_slotid; /* sent to server on each SEQ.
37 * op for dynamic resizing */
38 u32 target_highest_slotid; /* Server max_slot target */
39 u32 server_highest_slotid; /* Server highest slotid */
40 s32 d_target_highest_slotid; /* Derivative */
41 s32 d2_target_highest_slotid; /* 2nd derivative */
42 unsigned long generation; /* Generation counter for
43 target_highest_slotid */
44 struct completion complete;
48 * Session related parameters
51 struct nfs4_sessionid sess_id;
53 unsigned long session_state;
57 /* The fore and back channel */
58 struct nfs4_channel_attrs fc_attrs;
59 struct nfs4_slot_table fc_slot_table;
60 struct nfs4_channel_attrs bc_attrs;
61 struct nfs4_slot_table bc_slot_table;
62 struct nfs_client *clp;
63 /* Create session arguments */
64 unsigned int fc_target_max_rqst_sz;
65 unsigned int fc_target_max_resp_sz;
68 enum nfs4_session_state {
70 NFS4_SESSION_DRAINING,
73 #if defined(CONFIG_NFS_V4_1)
74 extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
75 extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
77 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
78 u32 target_highest_slotid);
79 extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
80 struct nfs4_slot *slot,
81 struct nfs4_sequence_res *res);
83 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
85 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
86 extern void nfs4_destroy_session(struct nfs4_session *session);
87 extern int nfs4_init_session(struct nfs_server *server);
88 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
90 extern void nfs4_session_drain_complete(struct nfs4_session *session,
91 struct nfs4_slot_table *tbl);
93 static inline bool nfs4_session_draining(struct nfs4_session *session)
95 return !!test_bit(NFS4_SESSION_DRAINING, &session->session_state);
98 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
99 struct nfs4_slot *slot);
100 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
103 * Determine if sessions are in use.
105 static inline int nfs4_has_session(const struct nfs_client *clp)
112 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
114 if (nfs4_has_session(clp))
115 return (clp->cl_session->flags & SESSION4_PERSIST);
119 #else /* defined(CONFIG_NFS_V4_1) */
121 static inline int nfs4_init_session(struct nfs_server *server)
127 * Determine if sessions are in use.
129 static inline int nfs4_has_session(const struct nfs_client *clp)
134 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
139 #endif /* defined(CONFIG_NFS_V4_1) */
140 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
141 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */