#define TDB_RECOVERY_INVALID_MAGIC (0x0ULL)
#define TDB_OFF_ERR ((tdb_off_t)-1)
+#define TDB_OFF_IS_ERR(off) unlikely(off >= (tdb_off_t)TDB_ERR_LAST)
+
+/* Packing errors into pointers and v.v. */
+#define TDB_PTR_IS_ERR(ptr) \
+ unlikely((void *)(ptr) >= (void *)(long)TDB_ERR_LAST)
+#define TDB_PTR_ERR(p) ((enum TDB_ERROR)(long)(p))
+#define TDB_ERR_PTR(err) ((void *)(long)(err))
+
+/* Common case of returning true, false or -ve error. */
+typedef int tdb_bool_err;
/* Prevent others from opening the file. */
#define TDB_OPEN_LOCK 0
};
struct tdb_methods {
- int (*tread)(struct tdb_context *, tdb_off_t, void *, tdb_len_t);
- int (*twrite)(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);
+ enum TDB_ERROR (*tread)(struct tdb_context *, tdb_off_t, void *,
+ tdb_len_t);
+ enum TDB_ERROR (*twrite)(struct tdb_context *, tdb_off_t, const void *,
+ tdb_len_t);
+ enum TDB_ERROR (*oob)(struct tdb_context *, tdb_off_t, bool);
+ enum TDB_ERROR (*expand_file)(struct tdb_context *, tdb_len_t);
void *(*direct)(struct tdb_context *, tdb_off_t, size_t, bool);
};
void tdb_lock_init(struct tdb_context *tdb);
/* Lock/unlock a range of hashes. */
-int tdb_lock_hashes(struct tdb_context *tdb,
- tdb_off_t hash_lock, tdb_len_t hash_range,
- int ltype, enum tdb_lock_flags waitflag);
-int tdb_unlock_hashes(struct tdb_context *tdb,
- tdb_off_t hash_lock,
- tdb_len_t hash_range, int ltype);
+enum TDB_ERROR tdb_lock_hashes(struct tdb_context *tdb,
+ tdb_off_t hash_lock, tdb_len_t hash_range,
+ int ltype, enum tdb_lock_flags waitflag);
+enum TDB_ERROR tdb_unlock_hashes(struct tdb_context *tdb,
+ tdb_off_t hash_lock,
+ tdb_len_t hash_range, int ltype);
/* Lock/unlock a particular free bucket. */
-int tdb_lock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off,
- enum tdb_lock_flags waitflag);
+enum TDB_ERROR tdb_lock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off,
+ enum tdb_lock_flags waitflag);
void tdb_unlock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off);
/* Serialize transaction start. */
-int tdb_transaction_lock(struct tdb_context *tdb, int ltype);
-int tdb_transaction_unlock(struct tdb_context *tdb, int ltype);
+enum TDB_ERROR tdb_transaction_lock(struct tdb_context *tdb, int ltype);
+void 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);
+enum TDB_ERROR tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
+ enum tdb_lock_flags flags, bool upgradable);
+void tdb_allrecord_unlock(struct tdb_context *tdb, int ltype);
+enum TDB_ERROR tdb_allrecord_upgrade(struct tdb_context *tdb);
/* Serialize db open. */
-int tdb_lock_open(struct tdb_context *tdb, enum tdb_lock_flags flags);
+enum TDB_ERROR 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);
+enum TDB_ERROR 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);
+enum TDB_ERROR tdb_lock_and_recover(struct tdb_context *tdb);
/* transaction.c: */
int tdb_transaction_recover(struct tdb_context *tdb);
bool tdb_needs_recovery(struct tdb_context *tdb);
/* tdb.c: */
-void COLD tdb_logerr(struct tdb_context *tdb,
- enum TDB_ERROR ecode,
- enum tdb_log_level level,
- const char *fmt, ...);
+enum TDB_ERROR COLD tdb_logerr(struct tdb_context *tdb,
+ enum TDB_ERROR ecode,
+ enum tdb_log_level level,
+ const char *fmt, ...);
#ifdef TDB_TRACE
void tdb_trace(struct tdb_context *tdb, const char *op);