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Trond Myklebust73e39aa2012-11-26 12:49:34 -05001/*
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
Trond Myklebust76e697b2012-11-26 14:20:49 -050010/* maximum number of slots to use */
Andy Adamsonbc4b2a82013-07-22 18:41:23 -040011#define NFS4_DEF_SLOT_TABLE_SIZE (64U)
Trond Myklebust0ca3f482012-11-21 22:34:45 -050012#define NFS4_MAX_SLOT_TABLE (1024U)
Trond Myklebust76e697b2012-11-26 14:20:49 -050013#define NFS4_NO_SLOT ((u32)-1)
14
15#if IS_ENABLED(CONFIG_NFS_V4)
16
17/* Sessions slot seqid */
18struct nfs4_slot {
19 struct nfs4_slot_table *table;
20 struct nfs4_slot *next;
21 unsigned long generation;
Trond Myklebust76e697b2012-11-26 14:20:49 -050022 u32 slot_nr;
23 u32 seq_nr;
Trond Myklebustac20d162012-12-15 15:36:07 -050024 unsigned int interrupted : 1;
Trond Myklebust76e697b2012-11-26 14:20:49 -050025};
26
27/* Sessions */
Andy Adamson774d5f12013-05-20 14:13:50 -040028enum nfs4_slot_tbl_state {
29 NFS4_SLOT_TBL_DRAINING,
30};
31
Trond Myklebust76e697b2012-11-26 14:20:49 -050032#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
33struct 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 */
Trond Myklebust1fa80642012-12-02 13:54:59 -050045 s32 d_target_highest_slotid; /* Derivative */
46 s32 d2_target_highest_slotid; /* 2nd derivative */
Trond Myklebust76e697b2012-11-26 14:20:49 -050047 unsigned long generation; /* Generation counter for
48 target_highest_slotid */
49 struct completion complete;
Andy Adamson774d5f12013-05-20 14:13:50 -040050 unsigned long slot_tbl_state;
Trond Myklebust76e697b2012-11-26 14:20:49 -050051};
52
53/*
54 * Session related parameters
55 */
56struct 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;
Trond Myklebust76e697b2012-11-26 14:20:49 -050069};
70
71enum nfs4_session_state {
72 NFS4_SESSION_INITING,
Trond Myklebust76e697b2012-11-26 14:20:49 -050073};
74
Trond Myklebust73e39aa2012-11-26 12:49:34 -050075#if defined(CONFIG_NFS_V4_1)
76extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
77extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
78
79extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
80 u32 target_highest_slotid);
81extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
82 struct nfs4_slot *slot,
83 struct nfs4_sequence_res *res);
84
85extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);
86
87extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
88extern void nfs4_destroy_session(struct nfs4_session *session);
Andy Adamson18aad3d2013-06-26 12:21:49 -040089extern int nfs4_init_session(struct nfs_client *clp);
Trond Myklebust73e39aa2012-11-26 12:49:34 -050090extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
91
Andy Adamson774d5f12013-05-20 14:13:50 -040092extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
Trond Myklebust76e697b2012-11-26 14:20:49 -050093
Andy Adamson774d5f12013-05-20 14:13:50 -040094static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
Trond Myklebust76e697b2012-11-26 14:20:49 -050095{
Andy Adamson774d5f12013-05-20 14:13:50 -040096 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
Trond Myklebust76e697b2012-11-26 14:20:49 -050097}
98
Trond Myklebustb75ad4c2012-11-29 17:27:47 -050099bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
100 struct nfs4_slot *slot);
101void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
102
Trond Myklebust76e697b2012-11-26 14:20:49 -0500103/*
104 * Determine if sessions are in use.
105 */
106static inline int nfs4_has_session(const struct nfs_client *clp)
107{
108 if (clp->cl_session)
109 return 1;
110 return 0;
111}
112
113static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
114{
115 if (nfs4_has_session(clp))
116 return (clp->cl_session->flags & SESSION4_PERSIST);
117 return 0;
118}
119
Trond Myklebust2f92ae32013-08-14 17:58:28 -0400120#ifdef CONFIG_CRC32
121/*
122 * nfs_session_id_hash - calculate the crc32 hash for the session id
123 * @session - pointer to session
124 */
125#define nfs_session_id_hash(sess_id) \
126 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
127#else
128#define nfs_session_id_hash(session) (0)
129#endif
Trond Myklebust73e39aa2012-11-26 12:49:34 -0500130#else /* defined(CONFIG_NFS_V4_1) */
131
Andy Adamson18aad3d2013-06-26 12:21:49 -0400132static inline int nfs4_init_session(struct nfs_client *clp)
Trond Myklebust73e39aa2012-11-26 12:49:34 -0500133{
134 return 0;
135}
136
Trond Myklebust76e697b2012-11-26 14:20:49 -0500137/*
138 * Determine if sessions are in use.
139 */
140static inline int nfs4_has_session(const struct nfs_client *clp)
141{
142 return 0;
143}
144
145static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
146{
147 return 0;
148}
149
Trond Myklebust73e39aa2012-11-26 12:49:34 -0500150#endif /* defined(CONFIG_NFS_V4_1) */
Trond Myklebust76e697b2012-11-26 14:20:49 -0500151#endif /* IS_ENABLED(CONFIG_NFS_V4) */
Trond Myklebust73e39aa2012-11-26 12:49:34 -0500152#endif /* __LINUX_FS_NFS_NFS4SESSION_H */