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 }; 26 27 /* Sessions */ 28 enum nfs4_slot_tbl_state { 29 NFS4_SLOT_TBL_DRAINING, 30 }; 31 32 #define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long)) 33 struct 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 */ 45 s32 d_target_highest_slotid; /* Derivative */ 46 s32 d2_target_highest_slotid; /* 2nd derivative */ 47 unsigned long generation; /* Generation counter for 48 target_highest_slotid */ 49 struct completion complete; 50 unsigned long slot_tbl_state; 51 }; 52 53 /* 54 * Session related parameters 55 */ 56 struct 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; 69 }; 70 71 enum nfs4_session_state { 72 NFS4_SESSION_INITING, 73 }; 74 75 extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, 76 unsigned int max_reqs, const char *queue); 77 extern void nfs4_release_slot_table(struct nfs4_slot_table *tbl); 78 extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); 79 extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); 80 extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl); 81 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, 82 struct nfs4_slot *slot); 83 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl); 84 85 static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl) 86 { 87 return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); 88 } 89 90 #if defined(CONFIG_NFS_V4_1) 91 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, 92 u32 target_highest_slotid); 93 extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, 94 struct nfs4_slot *slot, 95 struct nfs4_sequence_res *res); 96 97 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); 98 99 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); 100 extern void nfs4_destroy_session(struct nfs4_session *session); 101 extern int nfs4_init_session(struct nfs_client *clp); 102 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); 103 104 /* 105 * Determine if sessions are in use. 106 */ 107 static inline int nfs4_has_session(const struct nfs_client *clp) 108 { 109 if (clp->cl_session) 110 return 1; 111 return 0; 112 } 113 114 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 115 { 116 if (nfs4_has_session(clp)) 117 return (clp->cl_session->flags & SESSION4_PERSIST); 118 return 0; 119 } 120 121 #ifdef CONFIG_CRC32 122 /* 123 * nfs_session_id_hash - calculate the crc32 hash for the session id 124 * @session - pointer to session 125 */ 126 #define nfs_session_id_hash(sess_id) \ 127 (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data))) 128 #else 129 #define nfs_session_id_hash(session) (0) 130 #endif 131 #else /* defined(CONFIG_NFS_V4_1) */ 132 133 static inline int nfs4_init_session(struct nfs_client *clp) 134 { 135 return 0; 136 } 137 138 /* 139 * Determine if sessions are in use. 140 */ 141 static inline int nfs4_has_session(const struct nfs_client *clp) 142 { 143 return 0; 144 } 145 146 static inline int nfs4_has_persistent_session(const struct nfs_client *clp) 147 { 148 return 0; 149 } 150 151 #endif /* defined(CONFIG_NFS_V4_1) */ 152 #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 153 #endif /* __LINUX_FS_NFS_NFS4SESSION_H */ 154