/* 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 <Trond.Myklebust@netapp.com>
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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, 8*sizeof(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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