--- /dev/null
+/*
+ * 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 */
Code Review / kvmfornfv.git / blobdiff