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