#define TDB_SUBLEVEL_HASH_BITS 6
/* And 8 entries in each group, ie 8 groups per sublevel. */
#define TDB_HASH_GROUP_BITS 3
+/* This is currently 10: beyond this we chain. */
+#define TDB_MAX_LEVELS (1+(64-TDB_TOPLEVEL_HASH_BITS) / TDB_SUBLEVEL_HASH_BITS)
/* Extend file by least 100 times larger than needed. */
#define TDB_EXTENSION_FACTOR 100
uint64_t eof;
};
+/* If we bottom out of the subhashes, we chain. */
+struct tdb_chain {
+ tdb_off_t rec[1 << TDB_HASH_GROUP_BITS];
+ tdb_off_t next;
+};
+
/* this is stored at the front of every database */
struct tdb_header {
char magic_food[64]; /* for /etc/magic */
/* We ignore groups here, and treat it as a big array. */
unsigned entry;
unsigned int total_buckets;
- } levels[64 / TDB_SUBLEVEL_HASH_BITS];
+ } levels[TDB_MAX_LEVELS + 1];
unsigned int num_levels;
unsigned int toplevel_group;
/* This makes delete-everything-inside-traverse work as expected. */
int (*write)(struct tdb_context *, tdb_off_t, const void *, tdb_len_t);
int (*oob)(struct tdb_context *, tdb_off_t, bool);
int (*expand_file)(struct tdb_context *, tdb_len_t);
- void *(*direct)(struct tdb_context *, tdb_off_t, size_t);
+ void *(*direct)(struct tdb_context *, tdb_off_t, size_t, bool);
};
/*