+/* this is stored at the front of every database */
+struct tdb1_header {
+ char magic_food[32]; /* for /etc/magic */
+ uint32_t version; /* version of the code */
+ uint32_t hash_size; /* number of hash entries */
+ tdb1_off_t rwlocks; /* obsolete - kept to detect old formats */
+ tdb1_off_t recovery_start; /* offset of transaction recovery region */
+ tdb1_off_t sequence_number; /* used when TDB1_SEQNUM is set */
+ uint32_t magic1_hash; /* hash of TDB_MAGIC_FOOD. */
+ uint32_t magic2_hash; /* hash of TDB1_MAGIC. */
+ tdb1_off_t reserved[27];
+};
+
+struct tdb1_traverse_lock {
+ struct tdb1_traverse_lock *next;
+ uint32_t off;
+ uint32_t hash;
+ int lock_rw;
+};
+
+struct tdb_context {
+ /* Single list of all TDBs, to detect multiple opens. */
+ struct tdb_context *next;
+
+ /* Filename of the database. */
+ const char *name;
+
+ /* Logging function */
+ void (*log_fn)(struct tdb_context *tdb,
+ enum tdb_log_level level,
+ enum TDB_ERROR ecode,
+ const char *message,
+ void *data);
+ void *log_data;
+
+ /* Open flags passed to tdb_open. */
+ int open_flags;
+
+ /* low level (fnctl) lock functions. */
+ int (*lock_fn)(int fd, int rw, off_t off, off_t len, bool w, void *);
+ int (*unlock_fn)(int fd, int rw, off_t off, off_t len, void *);
+ void *lock_data;
+
+ /* the tdb flags passed to tdb_open. */
+ uint32_t flags;
+
+ /* Our statistics. */
+ struct tdb_attribute_stats stats;
+
+ /* The actual file information */
+ struct tdb_file *file;
+
+ /* Hash function. */
+ uint64_t (*hash_fn)(const void *key, size_t len, uint64_t seed, void *);
+ void *hash_data;
+ uint64_t hash_seed;
+
+ /* Our open hook, if any. */
+ enum TDB_ERROR (*openhook)(int fd, void *data);
+ void *openhook_data;
+
+ /* Last error we returned. */
+ enum TDB_ERROR last_error;
+
+ struct {
+
+ /* Are we accessing directly? (debugging check). */
+ int direct_access;
+
+ /* Set if we are in a transaction. */
+ struct tdb_transaction *transaction;
+
+ /* What free table are we using? */
+ tdb_off_t ftable_off;
+ unsigned int ftable;
+
+ /* IO methods: changes for transactions. */
+ const struct tdb_methods *io;
+
+ /* Direct access information */
+ struct tdb_access_hdr *access;
+ } tdb2;
+
+ struct {
+ int traverse_read; /* read-only traversal */
+ int traverse_write; /* read-write traversal */
+
+ struct tdb1_header header; /* a cached copy of the header */
+ struct tdb1_traverse_lock travlocks; /* current traversal locks */
+ const struct tdb1_methods *io;
+ struct tdb1_transaction *transaction;
+ int page_size;
+ int max_dead_records;
+ } tdb1;
+};
+
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