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_DEF_CB_SLOT_TABLE_SIZE (1U) 13 #define NFS4_MAX_SLOT_TABLE (1024U) 14 #define NFS4_NO_SLOT ((u32)-1) 15 16 #if IS_ENABLED(CONFIG_NFS_V4) 17 18 /* Sessions slot seqid */ 19 struct nfs4_slot { 20 struct nfs4_slot_table *table; 21 struct nfs4_slot *next; 22 unsigned long generation; 23 u32 slot_nr; 24 u32 seq_nr; 25 unsigned int interrupted : 1, 26 privileged : 1, 27 seq_done : 1; 28 }; 29 30 /* Sessions */ 31 enum nfs4_slot_tbl_state { 32 NFS4_SLOT_TBL_DRAINING, 33 }; 34 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; 55 }; 56 57 /* 58 * Session related parameters 59 */ 60 struct nfs4_session { 61 struct nfs4_sessionid sess_id; 62 u32 flags; 63 unsigned long session_state; 64 u32 hash_alg; 65 u32 ssv_len; 66 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; 73 }; 74 75 enum nfs4_session_state { 76 NFS4_SESSION_INITING, 77 NFS4_SESSION_ESTABLISHED, 78 }; 79 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); 94 95 static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl) 96 { 97 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); 98 } 99 100 static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl, 101 u32 slotid) 102 { 103 return !!test_bit(slotid, tbl->used_slots); 104 } 105 106 #if defined(CONFIG_NFS_V4_1) 107 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, 108 u32 target_highest_slotid); 109 extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, 110 struct nfs4_slot *slot, 111 struct nfs4_sequence_res *res); 112 113 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); 114 115 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); 116 extern void nfs4_destroy_session(struct nfs4_session *session); 117 extern int nfs4_init_session(struct nfs_client *clp); 118 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); 119 120 /* 121 * Determine if sessions are in use. 122 */ 123 static inline int nfs4_has_session(const struct nfs_client *clp) 124 { 125 if (clp->cl_session) 126 return 1; 127 return 0; 128 } 129 130 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 131 { 132 if (nfs4_has_session(clp)) 133 return (clp->cl_session->flags & SESSION4_PERSIST); 134 return 0; 135 } 136 137 static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst, 138 const struct nfs4_sessionid *src) 139 { 140 memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN); 141 } 142 143 #ifdef CONFIG_CRC32 144 /* 145 * nfs_session_id_hash - calculate the crc32 hash for the session id 146 * @session - pointer to session 147 */ 148 #define nfs_session_id_hash(sess_id) \ 149 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data))) 150 #else 151 #define nfs_session_id_hash(session) (0) 152 #endif 153 #else /* defined(CONFIG_NFS_V4_1) */ 154 155 static inline int nfs4_init_session(struct nfs_client *clp) 156 { 157 return 0; 158 } 159 160 /* 161 * Determine if sessions are in use. 162 */ 163 static inline int nfs4_has_session(const struct nfs_client *clp) 164 { 165 return 0; 166 } 167 168 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 169 { 170 return 0; 171 } 172 173 #endif /* defined(CONFIG_NFS_V4_1) */ 174 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 175 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */ 176