| /* |
| * null engine - doesn't do any transfers. Used to test fio. |
| * |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <assert.h> |
| |
| #include "../fio.h" |
| #include "../os.h" |
| |
| static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u) |
| { |
| io_u->resid = 0; |
| io_u->error = 0; |
| return FIO_Q_COMPLETED; |
| } |
| |
| static int fio_null_setup(struct thread_data *td) |
| { |
| struct fio_file *f; |
| int i; |
| |
| if (!td->total_file_size) { |
| log_err("fio: need size= set\n"); |
| return 1; |
| } |
| |
| td->io_size = td->total_file_size; |
| td->total_io_size = td->io_size; |
| |
| for_each_file(td, f, i) { |
| f->real_file_size = td->total_io_size / td->nr_files; |
| f->file_size = f->real_file_size; |
| } |
| |
| return 0; |
| } |
| |
| static int fio_null_open(struct thread_data fio_unused *td, |
| struct fio_file fio_unused *f) |
| { |
| f->fd = 0; |
| return 0; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "null", |
| .version = FIO_IOOPS_VERSION, |
| .setup = fio_null_setup, |
| .queue = fio_null_queue, |
| .open_file = fio_null_open, |
| .flags = FIO_SYNCIO | FIO_DISKLESSIO, |
| }; |
| |
| static void fio_init fio_null_register(void) |
| { |
| register_ioengine(&ioengine); |
| } |
| |
| static void fio_exit fio_null_unregister(void) |
| { |
| unregister_ioengine(&ioengine); |
| } |