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-rw-r--r--lib/tdb/common/tdb.c5
-rw-r--r--lib/tdb/docs/README19
2 files changed, 23 insertions, 1 deletions
diff --git a/lib/tdb/common/tdb.c b/lib/tdb/common/tdb.c
index 7317a3aa52..953c811c70 100644
--- a/lib/tdb/common/tdb.c
+++ b/lib/tdb/common/tdb.c
@@ -222,6 +222,8 @@ TDB_DATA tdb_fetch(struct tdb_context *tdb, TDB_DATA key)
*
* This is interesting for all readers of potentially large data structures in
* the tdb records, ldb indexes being one example.
+ *
+ * Return -1 if the record was not found.
*/
int tdb_parse_record(struct tdb_context *tdb, TDB_DATA key,
@@ -238,9 +240,10 @@ int tdb_parse_record(struct tdb_context *tdb, TDB_DATA key,
hash = tdb->hash_fn(&key);
if (!(rec_ptr = tdb_find_lock_hash(tdb,key,hash,F_RDLCK,&rec))) {
+ /* record not found */
tdb_trace_1rec_ret(tdb, "tdb_parse_record", key, -1);
tdb->ecode = TDB_ERR_NOEXIST;
- return 0;
+ return -1;
}
tdb_trace_1rec_ret(tdb, "tdb_parse_record", key, 0);
diff --git a/lib/tdb/docs/README b/lib/tdb/docs/README
index c02ee0e030..fe0e258183 100644
--- a/lib/tdb/docs/README
+++ b/lib/tdb/docs/README
@@ -105,6 +105,25 @@ TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
caller must free the resulting data
----------------------------------------------------------------------
+int tdb_parse_record(struct tdb_context *tdb, TDB_DATA key,
+ int (*parser)(TDB_DATA key, TDB_DATA data,
+ void *private_data),
+ void *private_data);
+
+ Hand a record to a parser function without allocating it.
+
+ This function is meant as a fast tdb_fetch alternative for large records
+ that are frequently read. The "key" and "data" arguments point directly
+ into the tdb shared memory, they are not aligned at any boundary.
+
+ WARNING: The parser is called while tdb holds a lock on the record. DO NOT
+ call other tdb routines from within the parser. Also, for good performance
+ you should make the parser fast to allow parallel operations.
+
+ tdb_parse_record returns -1 if the record was not found. If the record was
+ found, the return value of "parser" is passed up to the caller.
+
+----------------------------------------------------------------------
int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
check if an entry in the database exists