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 (16U) 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 }; 26 27 /* Sessions */ 28 #define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long)) 29 struct nfs4_slot_table { 30 struct nfs4_session *session; /* Parent session */ 31 struct nfs4_slot *slots; /* seqid per slot */ 32 unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */ 33 spinlock_t slot_tbl_lock; 34 struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */ 35 u32 max_slots; /* # slots in table */ 36 u32 max_slotid; /* Max allowed slotid value */ 37 u32 highest_used_slotid; /* sent to server on each SEQ. 38 * op for dynamic resizing */ 39 u32 target_highest_slotid; /* Server max_slot target */ 40 u32 server_highest_slotid; /* Server highest slotid */ 41 s32 d_target_highest_slotid; /* Derivative */ 42 s32 d2_target_highest_slotid; /* 2nd derivative */ 43 unsigned long generation; /* Generation counter for 44 target_highest_slotid */ 45 struct completion complete; 46 }; 47 48 /* 49 * Session related parameters 50 */ 51 struct nfs4_session { 52 struct nfs4_sessionid sess_id; 53 u32 flags; 54 unsigned long session_state; 55 u32 hash_alg; 56 u32 ssv_len; 57 58 /* The fore and back channel */ 59 struct nfs4_channel_attrs fc_attrs; 60 struct nfs4_slot_table fc_slot_table; 61 struct nfs4_channel_attrs bc_attrs; 62 struct nfs4_slot_table bc_slot_table; 63 struct nfs_client *clp; 64 /* Create session arguments */ 65 unsigned int fc_target_max_rqst_sz; 66 unsigned int fc_target_max_resp_sz; 67 }; 68 69 enum nfs4_session_state { 70 NFS4_SESSION_INITING, 71 NFS4_SESSION_DRAINING, 72 }; 73 74 #if defined(CONFIG_NFS_V4_1) 75 extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); 76 extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); 77 78 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, 79 u32 target_highest_slotid); 80 extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, 81 struct nfs4_slot *slot, 82 struct nfs4_sequence_res *res); 83 84 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); 85 86 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); 87 extern void nfs4_destroy_session(struct nfs4_session *session); 88 extern int nfs4_init_session(struct nfs_server *server); 89 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); 90 91 extern void nfs4_session_drain_complete(struct nfs4_session *session, 92 struct nfs4_slot_table *tbl); 93 94 static inline bool nfs4_session_draining(struct nfs4_session *session) 95 { 96 return !!test_bit(NFS4_SESSION_DRAINING, &session->session_state); 97 } 98 99 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, 100 struct nfs4_slot *slot); 101 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl); 102 103 /* 104 * Determine if sessions are in use. 105 */ 106 static inline int nfs4_has_session(const struct nfs_client *clp) 107 { 108 if (clp->cl_session) 109 return 1; 110 return 0; 111 } 112 113 static 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 } 119 120 #else /* defined(CONFIG_NFS_V4_1) */ 121 122 static inline int nfs4_init_session(struct nfs_server *server) 123 { 124 return 0; 125 } 126 127 /* 128 * Determine if sessions are in use. 129 */ 130 static inline int nfs4_has_session(const struct nfs_client *clp) 131 { 132 return 0; 133 } 134 135 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 136 { 137 return 0; 138 } 139 140 #endif /* defined(CONFIG_NFS_V4_1) */ 141 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 142 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */ 143