#define TDB_MAGIC_FOOD "TDB file\n"
#define TDB_VERSION ((uint64_t)(0x26011967 + 7))
#define TDB_MAGIC ((uint64_t)0x1999)
-#define TDB_FREE_MAGIC ((~(uint64_t)TDB_MAGIC) << 6)
-#define TDB_COALESCING_MAGIC (0xBAD1DEA2FEEDULL << 6)
+#define TDB_FREE_MAGIC ((uint64_t)0xFE)
+#define TDB_COALESCING_MAGIC ((uint64_t)0xFD)
#define TDB_HASH_MAGIC (0xA1ABE11A01092008ULL)
-#define TDB_RECOVERY_MAGIC (0xf53bc0e7U)
-#define TDB_RECOVERY_INVALID_MAGIC (0x0)
+#define TDB_RECOVERY_MAGIC (0xf53bc0e7ad124589ULL)
+#define TDB_RECOVERY_INVALID_MAGIC (0x0ULL)
#define TDB_OFF_ERR ((tdb_off_t)-1)
}
struct tdb_free_record {
- uint64_t magic_and_meta;
+ uint64_t magic_and_meta; /* TDB_OFF_UPPER_STEAL bits of magic */
uint64_t data_len; /* Not counting these two fields. */
/* This is why the minimum record size is 16 bytes. */
uint64_t next, prev;
static inline uint64_t frec_magic(const struct tdb_free_record *f)
{
- return f->magic_and_meta;
+ return f->magic_and_meta >> (64 - TDB_OFF_UPPER_STEAL);
+}
+
+static inline uint64_t frec_flist(const struct tdb_free_record *f)
+{
+ return f->magic_and_meta & ((1ULL << (64 - TDB_OFF_UPPER_STEAL)) - 1);
}
+struct tdb_recovery_record {
+ uint64_t magic;
+ /* Length of record. */
+ uint64_t max_len;
+ /* Length used. */
+ uint64_t len;
+ /* Old length of file before transaction. */
+ uint64_t eof;
+};
+
/* this is stored at the front of every database */
struct tdb_header {
char magic_food[64]; /* for /etc/magic */
uint64_t hash_test; /* result of hashing HASH_MAGIC. */
uint64_t hash_seed; /* "random" seed written at creation time. */
tdb_off_t free_list; /* (First) free list. */
+ tdb_off_t recovery; /* Transaction recovery area. */
- tdb_off_t reserved[27];
+ tdb_off_t reserved[26];
/* Top level hash table. */
tdb_off_t hashtable[1ULL << TDB_TOPLEVEL_HASH_BITS];
struct tdb_freelist {
struct tdb_used_record hdr;
+ tdb_off_t next;
tdb_off_t buckets[TDB_FREE_BUCKETS];
};
TDB_LOCK_WAIT = 1,
/* If set, don't log an error on failure. */
TDB_LOCK_PROBE = 2,
+ /* If set, don't check for recovery (used by recovery code). */
+ TDB_LOCK_NOCHECK = 4,
};
struct tdb_lock_type {
/* free.c: */
int tdb_flist_init(struct tdb_context *tdb);
+/* check.c needs these to iterate through free lists. */
+tdb_off_t first_flist(struct tdb_context *tdb);
+tdb_off_t next_flist(struct tdb_context *tdb, tdb_off_t flist);
+
/* If this fails, try tdb_expand. */
tdb_off_t alloc(struct tdb_context *tdb, size_t keylen, size_t datalen,
uint64_t hash, bool growing);
unsigned int size_to_bucket(tdb_len_t data_len);
tdb_off_t bucket_off(tdb_off_t flist_off, unsigned bucket);
+/* Used by tdb_summary */
+size_t dead_space(struct tdb_context *tdb, tdb_off_t off);
+
/* io.c: */
/* Initialize tdb->methods. */
void tdb_io_init(struct tdb_context *tdb);
enum tdb_lock_flags waitflag);
void tdb_unlock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off);
-/* Do we have any locks? */
-bool tdb_has_locks(struct tdb_context *tdb);
+/* Serialize transaction start. */
+int tdb_transaction_lock(struct tdb_context *tdb, int ltype);
+int tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
+
+/* Do we have any hash locks (ie. via tdb_chainlock) ? */
+bool tdb_has_hash_locks(struct tdb_context *tdb);
/* Lock entire database. */
int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
enum tdb_lock_flags flags, bool upgradable);
int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype);
+int tdb_allrecord_upgrade(struct tdb_context *tdb);
/* Serialize db open. */
-int tdb_lock_open(struct tdb_context *tdb);
+int tdb_lock_open(struct tdb_context *tdb, enum tdb_lock_flags flags);
void tdb_unlock_open(struct tdb_context *tdb);
+bool tdb_has_open_lock(struct tdb_context *tdb);
/* Serialize db expand. */
int tdb_lock_expand(struct tdb_context *tdb, int ltype);
void tdb_unlock_expand(struct tdb_context *tdb, int ltype);
bool tdb_has_expansion_lock(struct tdb_context *tdb);
+/* If it needs recovery, grab all the locks and do it. */
+int tdb_lock_and_recover(struct tdb_context *tdb);
/* traverse.c: */
int first_in_hash(struct tdb_context *tdb, int ltype,
struct traverse_info *tinfo,
TDB_DATA *kbuf, size_t *dlen);
-
-#if 0
-/* Low-level locking primitives. */
-int tdb_nest_lock(struct tdb_context *tdb, tdb_off_t offset, int ltype,
- enum tdb_lock_flags flags);
-int tdb_nest_unlock(struct tdb_context *tdb, tdb_off_t offset, int ltype);
-
-int tdb_munmap(struct tdb_context *tdb);
-void tdb_mmap(struct tdb_context *tdb);
-int tdb_lock(struct tdb_context *tdb, int list, int ltype);
-int tdb_lock_nonblock(struct tdb_context *tdb, int list, int ltype);
-bool tdb_have_locks(struct tdb_context *tdb);
-int tdb_unlock(struct tdb_context *tdb, int list, int ltype);
-int tdb_brlock(struct tdb_context *tdb,
- int rw_type, tdb_off_t offset, size_t len,
- enum tdb_lock_flags flags);
-int tdb_brunlock(struct tdb_context *tdb,
- int rw_type, tdb_off_t offset, size_t len);
-bool tdb_have_extra_locks(struct tdb_context *tdb);
-void tdb_release_extra_locks(struct tdb_context *tdb);
-int tdb_transaction_lock(struct tdb_context *tdb, int ltype);
-int tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
-int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
- enum tdb_lock_flags flags, bool upgradable);
-int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype);
-int tdb_allrecord_upgrade(struct tdb_context *tdb);
-int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off);
-int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off);
-int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_free(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
-tdb_off_t tdb_allocate(struct tdb_context *tdb, tdb_len_t length, struct tdb_record *rec);
-int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d);
-int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off);
-int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off);
+/* transaction.c: */
+int tdb_transaction_recover(struct tdb_context *tdb);
bool tdb_needs_recovery(struct tdb_context *tdb);
-int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
-int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct tdb_record *rec);
-int tdb_do_delete(struct tdb_context *tdb, tdb_off_t rec_ptr, struct tdb_record *rec);
-unsigned char *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len);
-int tdb_parse_data(struct tdb_context *tdb, TDB_DATA key,
- tdb_off_t offset, tdb_len_t len,
- int (*parser)(TDB_DATA key, TDB_DATA data,
- void *private_data),
- void *private_data);
-tdb_off_t tdb_find_lock_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash, int locktype,
- struct tdb_record *rec);
-void tdb_io_init(struct tdb_context *tdb);
-int tdb_expand(struct tdb_context *tdb, tdb_off_t size);
-int tdb_rec_free_read(struct tdb_context *tdb, tdb_off_t off,
- struct tdb_record *rec);
-#endif
#ifdef TDB_TRACE
void tdb_trace(struct tdb_context *tdb, const char *op);
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