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