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184 lines
5.2 KiB
184 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* fs/nfs/nfs4session.h |
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* |
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* Copyright (c) 2012 Trond Myklebust <[email protected]> |
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* |
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*/ |
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#ifndef __LINUX_FS_NFS_NFS4SESSION_H |
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#define __LINUX_FS_NFS_NFS4SESSION_H |
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/* maximum number of slots to use */ |
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#define NFS4_DEF_SLOT_TABLE_SIZE (64U) |
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#define NFS4_DEF_CB_SLOT_TABLE_SIZE (16U) |
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#define NFS4_MAX_SLOT_TABLE (1024U) |
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#define NFS4_NO_SLOT ((u32)-1) |
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#if IS_ENABLED(CONFIG_NFS_V4) |
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/* Sessions slot seqid */ |
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struct nfs4_slot { |
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struct nfs4_slot_table *table; |
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struct nfs4_slot *next; |
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unsigned long generation; |
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u32 slot_nr; |
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u32 seq_nr; |
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u32 seq_nr_last_acked; |
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u32 seq_nr_highest_sent; |
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unsigned int privileged : 1, |
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seq_done : 1; |
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}; |
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/* Sessions */ |
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enum nfs4_slot_tbl_state { |
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NFS4_SLOT_TBL_DRAINING, |
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}; |
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#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, BITS_PER_LONG) |
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struct nfs4_slot_table { |
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struct nfs4_session *session; /* Parent session */ |
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struct nfs4_slot *slots; /* seqid per slot */ |
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unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */ |
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spinlock_t slot_tbl_lock; |
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struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */ |
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wait_queue_head_t slot_waitq; /* Completion wait on slot */ |
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u32 max_slots; /* # slots in table */ |
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u32 max_slotid; /* Max allowed slotid value */ |
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u32 highest_used_slotid; /* sent to server on each SEQ. |
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* op for dynamic resizing */ |
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u32 target_highest_slotid; /* Server max_slot target */ |
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u32 server_highest_slotid; /* Server highest slotid */ |
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s32 d_target_highest_slotid; /* Derivative */ |
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s32 d2_target_highest_slotid; /* 2nd derivative */ |
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unsigned long generation; /* Generation counter for |
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target_highest_slotid */ |
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struct completion complete; |
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unsigned long slot_tbl_state; |
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}; |
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/* |
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* Session related parameters |
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*/ |
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struct nfs4_session { |
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struct nfs4_sessionid sess_id; |
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u32 flags; |
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unsigned long session_state; |
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u32 hash_alg; |
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u32 ssv_len; |
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/* The fore and back channel */ |
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struct nfs4_channel_attrs fc_attrs; |
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struct nfs4_slot_table fc_slot_table; |
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struct nfs4_channel_attrs bc_attrs; |
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struct nfs4_slot_table bc_slot_table; |
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struct nfs_client *clp; |
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}; |
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enum nfs4_session_state { |
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NFS4_SESSION_INITING, |
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NFS4_SESSION_ESTABLISHED, |
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}; |
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extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, |
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unsigned int max_reqs, const char *queue); |
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extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl); |
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extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); |
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extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid); |
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extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl, |
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u32 slotid, u32 seq_nr, |
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unsigned long timeout); |
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extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); |
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extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); |
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extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl); |
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bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, |
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struct nfs4_slot *slot); |
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void nfs41_wake_slot_table(struct nfs4_slot_table *tbl); |
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static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl) |
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{ |
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return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
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} |
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static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl, |
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u32 slotid) |
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{ |
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return !!test_bit(slotid, tbl->used_slots); |
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} |
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static inline struct nfs4_session *nfs4_get_session(const struct nfs_client *clp) |
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{ |
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return clp->cl_session; |
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} |
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#if defined(CONFIG_NFS_V4_1) |
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extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, |
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u32 target_highest_slotid); |
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extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, |
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struct nfs4_slot *slot, |
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struct nfs4_sequence_res *res); |
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extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); |
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extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); |
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extern void nfs4_destroy_session(struct nfs4_session *session); |
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extern int nfs4_init_session(struct nfs_client *clp); |
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extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); |
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/* |
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* Determine if sessions are in use. |
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*/ |
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static inline int nfs4_has_session(const struct nfs_client *clp) |
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{ |
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if (clp->cl_session) |
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return 1; |
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return 0; |
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} |
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static inline int nfs4_has_persistent_session(const struct nfs_client *clp) |
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{ |
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if (nfs4_has_session(clp)) |
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return (clp->cl_session->flags & SESSION4_PERSIST); |
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return 0; |
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} |
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static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst, |
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const struct nfs4_sessionid *src) |
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{ |
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memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN); |
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} |
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#ifdef CONFIG_CRC32 |
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/* |
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* nfs_session_id_hash - calculate the crc32 hash for the session id |
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* @session - pointer to session |
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*/ |
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#define nfs_session_id_hash(sess_id) \ |
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(~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data))) |
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#else |
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#define nfs_session_id_hash(session) (0) |
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#endif |
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#else /* defined(CONFIG_NFS_V4_1) */ |
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static inline int nfs4_init_session(struct nfs_client *clp) |
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{ |
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return 0; |
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} |
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/* |
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* Determine if sessions are in use. |
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*/ |
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static inline int nfs4_has_session(const struct nfs_client *clp) |
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{ |
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return 0; |
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} |
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static inline int nfs4_has_persistent_session(const struct nfs_client *clp) |
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{ |
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return 0; |
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} |
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#define nfs_session_id_hash(session) (0) |
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#endif /* defined(CONFIG_NFS_V4_1) */ |
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#endif /* IS_ENABLED(CONFIG_NFS_V4) */ |
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#endif /* __LINUX_FS_NFS_NFS4SESSION_H */
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