Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 1 | /* |
| 2 | * null engine - doesn't do any transfers. Used to test fio. |
| 3 | * |
| 4 | */ |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <unistd.h> |
| 8 | #include <errno.h> |
| 9 | #include <assert.h> |
| 10 | |
| 11 | #include "../fio.h" |
| 12 | #include "../os.h" |
| 13 | |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 14 | static int fio_null_queue(struct thread_data fio_unused *td, struct io_u *io_u) |
Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 15 | { |
Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 16 | io_u->resid = 0; |
| 17 | io_u->error = 0; |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame] | 18 | return FIO_Q_COMPLETED; |
Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 19 | } |
| 20 | |
Jens Axboe | 2fd233b | 2007-03-02 08:44:25 +0100 | [diff] [blame] | 21 | static int fio_null_setup(struct thread_data *td) |
| 22 | { |
| 23 | struct fio_file *f; |
| 24 | int i; |
| 25 | |
| 26 | if (!td->total_file_size) { |
| 27 | log_err("fio: need size= set\n"); |
| 28 | return 1; |
| 29 | } |
| 30 | |
| 31 | td->io_size = td->total_file_size; |
| 32 | td->total_io_size = td->io_size; |
| 33 | |
| 34 | for_each_file(td, f, i) { |
| 35 | f->fd = dup(STDOUT_FILENO); |
| 36 | f->real_file_size = td->total_io_size / td->nr_files; |
| 37 | f->file_size = f->real_file_size; |
| 38 | } |
| 39 | |
| 40 | td->nr_open_files = td->nr_files; |
| 41 | return 0; |
| 42 | } |
| 43 | |
Jens Axboe | b5af829 | 2007-03-08 12:43:13 +0100 | [diff] [blame^] | 44 | static int fio_null_open(struct thread_data fio_unused *td, |
| 45 | struct fio_file fio_unused *f) |
| 46 | { |
| 47 | return 0; |
| 48 | } |
| 49 | |
Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 50 | static struct ioengine_ops ioengine = { |
| 51 | .name = "null", |
| 52 | .version = FIO_IOOPS_VERSION, |
Jens Axboe | 2fd233b | 2007-03-02 08:44:25 +0100 | [diff] [blame] | 53 | .setup = fio_null_setup, |
Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 54 | .queue = fio_null_queue, |
Jens Axboe | b5af829 | 2007-03-08 12:43:13 +0100 | [diff] [blame^] | 55 | .open_file = fio_null_open, |
| 56 | .flags = FIO_SYNCIO | FIO_DISKLESSIO, |
Jens Axboe | a94ea28 | 2006-11-24 12:37:34 +0100 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | static void fio_init fio_null_register(void) |
| 60 | { |
| 61 | register_ioengine(&ioengine); |
| 62 | } |
| 63 | |
| 64 | static void fio_exit fio_null_unregister(void) |
| 65 | { |
| 66 | unregister_ioengine(&ioengine); |
| 67 | } |