tdb: implement tdb_summary.

[ccan] / ccan / tdb / tdb.h

diff --git a/ccan/tdb/tdb.h b/ccan/tdb/tdb.h
index 93ac25241b880ad1233978732b2e29e13bb75f96..070f09b4e19075e05f7bdfebff634d93fddcc89d 100644 (file)
--- a/ccan/tdb/tdb.h
+++ b/ccan/tdb/tdb.h
@@ -56,6 +56,8 @@ extern "C" {
 #define TDB_SEQNUM   128 /* maintain a sequence number */
 #define TDB_VOLATILE   256 /* Activate the per-hashchain freelist, default 5 */
 #define TDB_ALLOW_NESTING 512 /* Allow transactions to nest */
+#define TDB_DISALLOW_NESTING 1024 /* Disallow transactions to nest */
+#define TDB_INCOMPATIBLE_HASH 2048 /* Better hashing: can't be opened by older tdb versions. */
 
 /* error codes */
 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK, 
@@ -63,6 +65,9 @@ enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
                TDB_ERR_NOEXIST, TDB_ERR_EINVAL, TDB_ERR_RDONLY,
                TDB_ERR_NESTING};
 
+/* flags for tdb_summary. Logical or to combine. */
+enum tdb_summary_flags { TDB_SUMMARY_HISTOGRAMS = 1 };
+
 /* debugging uses one of the following levels */
 enum tdb_debug_level {TDB_DEBUG_FATAL = 0, TDB_DEBUG_ERROR, 
                      TDB_DEBUG_WARNING, TDB_DEBUG_TRACE};
@@ -148,6 +153,10 @@ void tdb_add_flags(struct tdb_context *tdb, unsigned flag);
 void tdb_remove_flags(struct tdb_context *tdb, unsigned flag);
 void tdb_enable_seqnum(struct tdb_context *tdb);
 void tdb_increment_seqnum_nonblock(struct tdb_context *tdb);
+unsigned int tdb_jenkins_hash(TDB_DATA *key);
+int tdb_check(struct tdb_context *tdb,
+             int (*check)(TDB_DATA key, TDB_DATA data, void *private),
+             void *private);
 
 /* Low level locking functions: use with care */
 int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key);
@@ -169,6 +178,7 @@ void tdb_dump_all(struct tdb_context *tdb);
 int tdb_printfreelist(struct tdb_context *tdb);
 int tdb_validate_freelist(struct tdb_context *tdb, int *pnum_entries);
 int tdb_freelist_size(struct tdb_context *tdb);
+char *tdb_summary(struct tdb_context *tdb, enum tdb_summary_flags flags);
 
 extern TDB_DATA tdb_null;