engine: add ftruncate ioengine

[fio.git] / engines / ftruncate.c

diff --git a/engines/ftruncate.c b/engines/ftruncate.c
new file mode 100644 (file)
index 0000000..e86dbac
--- /dev/null
+++ b/engines/ftruncate.c
@@ -0,0 +1,56 @@
+/*
+ * ftruncate: ioengine for git://git.kernel.dk/fio.git
+ *
+ * IO engine that does regular truncates to simulate data transfer
+ * as fio ioengine.
+ * DDIR_WRITE does ftruncate
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/uio.h>
+#include <errno.h>
+#include <assert.h>
+#include <fcntl.h>
+
+#include "../fio.h"
+#include "../filehash.h"
+
+static int fio_ftruncate_queue(struct thread_data *td, struct io_u *io_u)
+{
+       struct fio_file *f = io_u->file;
+       int ret;
+       fio_ro_check(td, io_u);
+
+       if (io_u->ddir != DDIR_WRITE) {
+               io_u->error = EINVAL;
+               return FIO_Q_COMPLETED;
+       }
+       ret = ftruncate(f->fd, io_u->offset);
+
+       if (ret)
+               io_u->error = errno;
+
+       return FIO_Q_COMPLETED;
+}
+
+static struct ioengine_ops ioengine = {
+       .name           = "ftruncate",
+       .version        = FIO_IOOPS_VERSION,
+       .queue          = fio_ftruncate_queue,
+       .open_file      = generic_open_file,
+       .close_file     = generic_close_file,
+       .get_file_size  = generic_get_file_size,
+       .flags          = FIO_SYNCIO | FIO_FAKEIO
+};
+
+static void fio_init fio_syncio_register(void)
+{
+       register_ioengine(&ioengine);
+}
+
+static void fio_exit fio_syncio_unregister(void)
+{
+       unregister_ioengine(&ioengine);
+}