tdb2: tdb_repack

[ccan] / ccan / tdb2 / tdb.c

diff --git a/ccan/tdb2/tdb.c b/ccan/tdb2/tdb.c
index c6bd8072ea9c4b18d55ee7b1ca5c4e64e550805d..53e1de624d70d7fe188f1ce9c5a23453aa84fb6f 100644 (file)
--- a/ccan/tdb2/tdb.c
+++ b/ccan/tdb2/tdb.c
@@ -589,3 +589,64 @@ int tdb_fd(const struct tdb_context *tdb)
 {
        return tdb->file->fd;
 }
+
+struct traverse_state {
+       enum TDB_ERROR error;
+       struct tdb_context *dest_db;
+};
+
+/*
+  traverse function for repacking
+ */
+static int repack_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data,
+                          struct traverse_state *state)
+{
+       state->error = tdb_store(state->dest_db, key, data, TDB_INSERT);
+       if (state->error != TDB_SUCCESS) {
+               return -1;
+       }
+       return 0;
+}
+
+enum TDB_ERROR tdb_repack(struct tdb_context *tdb)
+{
+       struct tdb_context *tmp_db;
+       struct traverse_state state;
+
+       state.error = tdb_transaction_start(tdb);
+       if (state.error != TDB_SUCCESS) {
+               return state.error;
+       }
+
+       tmp_db = tdb_open("tmpdb", TDB_INTERNAL, O_RDWR|O_CREAT, 0, NULL);
+       if (tmp_db == NULL) {
+               state.error = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
+                                        __location__
+                                        " Failed to create tmp_db");
+               tdb_transaction_cancel(tdb);
+               return tdb->last_error = state.error;
+       }
+
+       state.dest_db = tmp_db;
+       if (tdb_traverse(tdb, repack_traverse, &state) < 0) {
+               goto fail;
+       }
+
+       state.error = tdb_wipe_all(tdb);
+       if (state.error != TDB_SUCCESS) {
+               goto fail;
+       }
+
+       state.dest_db = tdb;
+       if (tdb_traverse(tmp_db, repack_traverse, &state) < 0) {
+               goto fail;
+       }
+
+       tdb_close(tmp_db);
+       return tdb_transaction_commit(tdb);
+
+fail:
+       tdb_transaction_cancel(tdb);
+       tdb_close(tmp_db);
+       return state.error;
+}