| /* |
| * sync engine |
| * |
| * IO engine that does regular read(2)/write(2) with lseek(2) to transfer |
| * data. |
| * |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <assert.h> |
| |
| #include "../fio.h" |
| #include "../os.h" |
| |
| static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u) |
| { |
| struct fio_file *f = io_u->file; |
| |
| if (io_u->ddir == DDIR_SYNC) |
| return 0; |
| if (io_u->offset == f->last_completed_pos) |
| return 0; |
| |
| if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) { |
| td_verror(td, errno, "lseek"); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u) |
| { |
| struct fio_file *f = io_u->file; |
| int ret; |
| |
| if (io_u->ddir == DDIR_READ) |
| ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
| else if (io_u->ddir == DDIR_WRITE) |
| ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
| else |
| ret = fsync(f->fd); |
| |
| 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) |
| td_verror(td, io_u->error, "xfer"); |
| |
| return FIO_Q_COMPLETED; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "sync", |
| .version = FIO_IOOPS_VERSION, |
| .prep = fio_syncio_prep, |
| .queue = fio_syncio_queue, |
| .open_file = generic_open_file, |
| .close_file = generic_close_file, |
| .flags = FIO_SYNCIO, |
| }; |
| |
| static void fio_init fio_syncio_register(void) |
| { |
| register_ioengine(&ioengine); |
| } |
| |
| static void fio_exit fio_syncio_unregister(void) |
| { |
| unregister_ioengine(&ioengine); |
| } |