tdb: test exponential recovery expansion problem.

diff --git a/ccan/tdb/test/run-transaction-expand.c b/ccan/tdb/test/run-transaction-expand.c
new file mode 100644 (file)
index 0000000..463cb10
--- /dev/null
+++ b/ccan/tdb/test/run-transaction-expand.c
@@ -0,0 +1,78 @@
+/* We need this otherwise fcntl locking fails. */
+#define _FILE_OFFSET_BITS 64
+#define _XOPEN_SOURCE 500
+#include <ccan/tdb/tdb_private.h>
+
+/* Speed up the tests: setting TDB_NOSYNC removed recovery altogether. */
+static inline int fake_fsync(int fd)
+{
+       return 0;
+}
+#define fsync fake_fsync
+
+#ifdef MS_SYNC
+static inline int fake_msync(void *addr, size_t length, int flags)
+{
+       return 0;
+}
+#define msync fake_msync
+#endif
+
+#include <ccan/tdb/tdb.h>
+#include <ccan/tdb/io.c>
+#include <ccan/tdb/tdb.c>
+#include <ccan/tdb/lock.c>
+#include <ccan/tdb/freelist.c>
+#include <ccan/tdb/traverse.c>
+#include <ccan/tdb/transaction.c>
+#include <ccan/tdb/error.c>
+#include <ccan/tdb/open.c>
+#include <ccan/tdb/check.c>
+#include <ccan/tdb/hash.c>
+#include <ccan/tap/tap.h>
+#include <stdlib.h>
+#include <err.h>
+#include "logging.h"
+
+static void write_record(struct tdb_context *tdb, size_t extra_len,
+                        TDB_DATA *data)
+{
+       TDB_DATA key;
+       key.dsize = strlen("hi");
+       key.dptr = (void *)"hi";
+
+       data->dptr = realloc(data->dptr, data->dsize + extra_len);
+       memset(data->dptr + data->dsize, 'x', extra_len);
+       data->dsize += extra_len;
+       tdb_transaction_start(tdb);
+       tdb_store(tdb, key, *data, TDB_REPLACE);
+       tdb_transaction_commit(tdb);
+       diag("TDB size = %zu", (size_t)tdb->map_size);
+}
+
+int main(int argc, char *argv[])
+{
+       struct tdb_context *tdb;
+       size_t i;
+       TDB_DATA data;
+
+       plan_tests(2);
+       tdb = tdb_open_ex("run-transaction-expand.tdb",
+                         1024, TDB_CLEAR_IF_FIRST,
+                         O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
+       ok1(tdb);
+
+       data.dsize = 0;
+       data.dptr = NULL;
+
+       /* Simulate a slowly growing record. */
+       for (i = 0; i < 1000; i++)
+               write_record(tdb, getpagesize(), &data);
+
+       /* We should only be about 3 times larger than largest record. */
+       ok1(tdb->map_size < 3 * i * getpagesize());
+       tdb_close(tdb);
+       free(data.dptr);
+
+       return exit_status();
+}