1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * fs/nfs/nfs4session.h 4 * 5 * Copyright (c) 2012 Trond Myklebust <Trond.Myklebust@netapp.com> 6 * 7 */ 8 #ifndef __LINUX_FS_NFS_NFS4SESSION_H 9 #define __LINUX_FS_NFS_NFS4SESSION_H 10 11 /* maximum number of slots to use */ 12 #define NFS4_DEF_SLOT_TABLE_SIZE (64U) 13 #define NFS4_DEF_CB_SLOT_TABLE_SIZE (16U) 14 #define NFS4_MAX_SLOT_TABLE (1024U) 15 #define NFS4_NO_SLOT ((u32)-1) 16 17 #if IS_ENABLED(CONFIG_NFS_V4) 18 19 /* Sessions slot seqid */ 20 struct nfs4_slot { 21 struct nfs4_slot_table *table; 22 struct nfs4_slot *next; 23 unsigned long generation; 24 u32 slot_nr; 25 u32 seq_nr; 26 u32 seq_nr_last_acked; 27 u32 seq_nr_highest_sent; 28 unsigned int privileged : 1, 29 seq_done : 1; 30 }; 31 32 /* Sessions */ 33 enum nfs4_slot_tbl_state { 34 NFS4_SLOT_TBL_DRAINING, 35 }; 36 37 #define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long)) 38 struct nfs4_slot_table { 39 struct nfs4_session *session; /* Parent session */ 40 struct nfs4_slot *slots; /* seqid per slot */ 41 unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */ 42 spinlock_t slot_tbl_lock; 43 struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */ 44 wait_queue_head_t slot_waitq; /* Completion wait on slot */ 45 u32 max_slots; /* # slots in table */ 46 u32 max_slotid; /* Max allowed slotid value */ 47 u32 highest_used_slotid; /* sent to server on each SEQ. 48 * op for dynamic resizing */ 49 u32 target_highest_slotid; /* Server max_slot target */ 50 u32 server_highest_slotid; /* Server highest slotid */ 51 s32 d_target_highest_slotid; /* Derivative */ 52 s32 d2_target_highest_slotid; /* 2nd derivative */ 53 unsigned long generation; /* Generation counter for 54 target_highest_slotid */ 55 struct completion complete; 56 unsigned long slot_tbl_state; 57 }; 58 59 /* 60 * Session related parameters 61 */ 62 struct nfs4_session { 63 struct nfs4_sessionid sess_id; 64 u32 flags; 65 unsigned long session_state; 66 u32 hash_alg; 67 u32 ssv_len; 68 69 /* The fore and back channel */ 70 struct nfs4_channel_attrs fc_attrs; 71 struct nfs4_slot_table fc_slot_table; 72 struct nfs4_channel_attrs bc_attrs; 73 struct nfs4_slot_table bc_slot_table; 74 struct nfs_client *clp; 75 }; 76 77 enum nfs4_session_state { 78 NFS4_SESSION_INITING, 79 NFS4_SESSION_ESTABLISHED, 80 }; 81 82 extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, 83 unsigned int max_reqs, const char *queue); 84 extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl); 85 extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); 86 extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid); 87 extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl, 88 u32 slotid, u32 seq_nr, 89 unsigned long timeout); 90 extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); 91 extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); 92 extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl); 93 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, 94 struct nfs4_slot *slot); 95 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl); 96 97 static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl) 98 { 99 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); 100 } 101 102 static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl, 103 u32 slotid) 104 { 105 return !!test_bit(slotid, tbl->used_slots); 106 } 107 108 static inline struct nfs4_session *nfs4_get_session(const struct nfs_client *clp) 109 { 110 return clp->cl_session; 111 } 112 113 #if defined(CONFIG_NFS_V4_1) 114 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, 115 u32 target_highest_slotid); 116 extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, 117 struct nfs4_slot *slot, 118 struct nfs4_sequence_res *res); 119 120 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); 121 122 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); 123 extern void nfs4_destroy_session(struct nfs4_session *session); 124 extern int nfs4_init_session(struct nfs_client *clp); 125 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); 126 127 /* 128 * Determine if sessions are in use. 129 */ 130 static inline int nfs4_has_session(const struct nfs_client *clp) 131 { 132 if (clp->cl_session) 133 return 1; 134 return 0; 135 } 136 137 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 138 { 139 if (nfs4_has_session(clp)) 140 return (clp->cl_session->flags & SESSION4_PERSIST); 141 return 0; 142 } 143 144 static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst, 145 const struct nfs4_sessionid *src) 146 { 147 memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN); 148 } 149 150 #ifdef CONFIG_CRC32 151 /* 152 * nfs_session_id_hash - calculate the crc32 hash for the session id 153 * @session - pointer to session 154 */ 155 #define nfs_session_id_hash(sess_id) \ 156 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data))) 157 #else 158 #define nfs_session_id_hash(session) (0) 159 #endif 160 #else /* defined(CONFIG_NFS_V4_1) */ 161 162 static inline int nfs4_init_session(struct nfs_client *clp) 163 { 164 return 0; 165 } 166 167 /* 168 * Determine if sessions are in use. 169 */ 170 static inline int nfs4_has_session(const struct nfs_client *clp) 171 { 172 return 0; 173 } 174 175 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 176 { 177 return 0; 178 } 179 180 #define nfs_session_id_hash(session) (0) 181 182 #endif /* defined(CONFIG_NFS_V4_1) */ 183 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 184 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */ 185