first async IO code drop
diff --git a/engines/glusterfs_sync.c b/engines/glusterfs_sync.c
new file mode 100644
index 0000000..cff6427
--- /dev/null
+++ b/engines/glusterfs_sync.c
@@ -0,0 +1,93 @@
+/*
+ * glusterfs engine
+ *
+ * IO engine using Glusterfs's gfapi sync interface
+ *
+ */
+
+#include "gfapi.h"
+
+#define LAST_POS(f) ((f)->engine_data)
+static int fio_gf_prep(struct thread_data *td, struct io_u *io_u)
+{
+ struct fio_file *f = io_u->file;
+ struct gf_data *g = td->io_ops->data;
+
+ dprint(FD_FILE, "fio prep\n");
+
+ if (!ddir_rw(io_u->ddir))
+ return 0;
+
+ if (LAST_POS(f) != -1ULL && LAST_POS(f) == io_u->offset)
+ return 0;
+
+ if (glfs_lseek(g->fd, io_u->offset, SEEK_SET) < 0) {
+ td_verror(td, errno, "lseek");
+ return 1;
+ }
+
+ return 0;
+}
+
+static int fio_gf_queue(struct thread_data *td, struct io_u *io_u)
+{
+ struct gf_data *g = td->io_ops->data;
+ int ret = 0;
+
+ dprint(FD_FILE, "fio queue len %lu\n", io_u->xfer_buflen);
+ fio_ro_check(td, io_u);
+
+ if (io_u->ddir == DDIR_READ)
+ ret = glfs_read(g->fd, io_u->xfer_buf, io_u->xfer_buflen, 0);
+ else if (io_u->ddir == DDIR_WRITE)
+ ret = glfs_write(g->fd, io_u->xfer_buf, io_u->xfer_buflen, 0);
+ else {
+ log_err("unsupported operation.\n");
+ return -EINVAL;
+ }
+ dprint(FD_FILE, "fio len %lu ret %d\n", io_u->xfer_buflen, ret);
+ if (io_u->file && ret >= 0 && ddir_rw(io_u->ddir))
+ LAST_POS(io_u->file) = io_u->offset + ret;
+
+ if (ret != (int) io_u->xfer_buflen) {
+ if (ret >= 0) {
+ io_u->resid = io_u->xfer_buflen - ret;
+ io_u->error = 0;
+ return FIO_Q_COMPLETED;
+ } else
+ io_u->error = errno;
+ }
+
+ if (io_u->error){
+ log_err("IO failed.\n");
+ td_verror(td, io_u->error, "xfer");
+ }
+
+ return FIO_Q_COMPLETED;
+
+}
+
+static struct ioengine_ops ioengine = {
+ .name = "gfapi",
+ .version = FIO_IOOPS_VERSION,
+ .init = fio_gf_setup,
+ .cleanup = fio_gf_cleanup,
+ .prep = fio_gf_prep,
+ .queue = fio_gf_queue,
+ .open_file = fio_gf_open_file,
+ .close_file = fio_gf_close_file,
+ .get_file_size = fio_gf_get_file_size,
+ .options = gfapi_options,
+ .option_struct_size = sizeof(struct gf_options),
+ .flags = FIO_SYNCIO | FIO_DISKLESSIO,
+};
+
+static void fio_init fio_gf_register(void)
+{
+ register_ioengine(&ioengine);
+}
+
+static void fio_exit fio_gf_unregister(void)
+{
+ unregister_ioengine(&ioengine);
+}