1 files changed, 166 insertions, 0 deletions
diff --git a/lib/tdb/test/run-rdlock-upgrade.c b/lib/tdb/test/run-rdlock-upgrade.c
new file mode 100644
index 0000000..042001b
--- /dev/null
+++ b/lib/tdb/test/run-rdlock-upgrade.c
@@ -0,0 +1,166 @@
+#include "../common/io.c"
+#include "../common/tdb.c"
+#include "../common/lock.c"
+#include "../common/freelist.c"
+#include "../common/traverse.c"
+#include "../common/transaction.c"
+#include "../common/error.c"
+#include "../common/open.c"
+#include "../common/check.c"
+#include "../common/hash.c"
+#include "../common/mutex.c"
+#include "tap-interface.h"
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdarg.h>
+#include "logging.h"
+
+static TDB_DATA key, data;
+
+static void do_chainlock(const char *name, int tdb_flags, int up, int down)
+{
+	struct tdb_context *tdb;
+	int ret;
+	ssize_t nread, nwritten;
+	char c = 0;
+
+	tdb = tdb_open_ex(name, 3, tdb_flags,
+			  O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
+	ok(tdb, "tdb_open_ex should succeed");
+
+	ret = tdb_chainlock_read(tdb, key);
+	ok(ret == 0, "tdb_chainlock_read should succeed");
+
+	nwritten = write(up, &c, sizeof(c));
+	ok(nwritten == sizeof(c), "write should succeed");
+
+	nread = read(down, &c, sizeof(c));
+	ok(nread == 0, "read should succeed");
+
+	exit(0);
+}
+
+static void do_trylock(const char *name, int tdb_flags, int up, int down)
+{
+	struct tdb_context *tdb;
+	int ret;
+	ssize_t nread, nwritten;
+	char c = 0;
+
+	tdb = tdb_open_ex(name, 3, tdb_flags,
+			  O_RDWR|O_CREAT, 0755, &taplogctx, NULL);
+	ok(tdb, "tdb_open_ex should succeed");
+
+	/*
+	 * tdb used to have a bug where with fcntl locks an upgrade
+	 * from a readlock to writelock did not check for the
+	 * underlying fcntl lock. Mutexes don't distinguish between
+	 * readlocks and writelocks, so that bug does not apply here.
+	 */
+
+	ret = tdb_chainlock_read(tdb, key);
+	ok(ret == 0, "tdb_chainlock_read should succeed");
+
+	ret = tdb_chainlock_nonblock(tdb, key);
+	ok(ret == -1, "tdb_chainlock_nonblock should fail");
+
+	nwritten = write(up, &c, sizeof(c));
+	ok(nwritten == sizeof(c), "write should succeed");
+
+	nread = read(down, &c, sizeof(c));
+	ok(nread == 0, "read should succeed");
+
+	exit(0);
+}
+
+static int do_tests(const char *name, int tdb_flags)
+{
+	int ret;
+	pid_t chainlock_child, store_child;
+	int chainlock_down[2];
+	int chainlock_up[2];
+	int store_down[2];
+	int store_up[2];
+	char c;
+	ssize_t nread;
+
+	key.dsize = strlen("hi");
+	key.dptr = discard_const_p(uint8_t, "hi");
+	data.dsize = strlen("world");
+	data.dptr = discard_const_p(uint8_t, "world");
+
+	ret = pipe(chainlock_down);
+	ok(ret == 0, "pipe should succeed");
+
+	ret = pipe(chainlock_up);
+	ok(ret == 0, "pipe should succeed");
+
+	ret = pipe(store_down);
+	ok(ret == 0, "pipe should succeed");
+
+	ret = pipe(store_up);
+	ok(ret == 0, "pipe should succeed");
+
+	chainlock_child = fork();
+	ok(chainlock_child != -1, "fork should succeed");
+
+	if (chainlock_child == 0) {
+		close(chainlock_up[0]);
+		close(chainlock_down[1]);
+		close(store_up[0]);
+		close(store_up[1]);
+		close(store_down[0]);
+		close(store_down[1]);
+		do_chainlock(name, tdb_flags,
+			     chainlock_up[1], chainlock_down[0]);
+		exit(0);
+	}
+	close(chainlock_up[1]);
+	close(chainlock_down[0]);
+
+	nread = read(chainlock_up[0], &c, sizeof(c));
+	ok(nread == sizeof(c), "read should succeed");
+
+	/*
+	 * Now we have a process holding a chain read lock. Start
+	 * another process trying to write lock. This should fail.
+	 */
+
+	store_child = fork();
+	ok(store_child != -1, "fork should succeed");
+
+	if (store_child == 0) {
+		close(chainlock_up[0]);
+		close(chainlock_down[1]);
+		close(store_up[0]);
+		close(store_down[1]);
+		do_trylock(name, tdb_flags,
+			   store_up[1], store_down[0]);
+		exit(0);
+	}
+	close(store_up[1]);
+	close(store_down[0]);
+
+	nread = read(store_up[0], &c, sizeof(c));
+	ok(nread == sizeof(c), "read should succeed");
+
+	close(chainlock_up[0]);
+	close(chainlock_down[1]);
+	close(store_up[0]);
+	close(store_down[1]);
+	diag("%s tests done", name);
+	return exit_status();
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	ret = do_tests("rdlock-upgrade.tdb",
+		       TDB_CLEAR_IF_FIRST |
+		       TDB_INCOMPATIBLE_HASH);
+	ok(ret == 0, "rdlock-upgrade.tdb tests should succeed");
+
+	return exit_status();
+}