| 1 | /* |
| 2 | * sync/psync engine |
| 3 | * |
| 4 | * IO engine that does regular read(2)/write(2) with lseek(2) to transfer |
| 5 | * data and IO engine that does regular pread(2)/pwrite(2) to transfer data. |
| 6 | * |
| 7 | */ |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <unistd.h> |
| 11 | #include <errno.h> |
| 12 | #include <assert.h> |
| 13 | |
| 14 | #include "../fio.h" |
| 15 | |
| 16 | static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u) |
| 17 | { |
| 18 | struct fio_file *f = io_u->file; |
| 19 | |
| 20 | if (io_u->ddir == DDIR_SYNC) |
| 21 | return 0; |
| 22 | if (io_u->offset == f->last_completed_pos) |
| 23 | return 0; |
| 24 | |
| 25 | if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) { |
| 26 | td_verror(td, errno, "lseek"); |
| 27 | return 1; |
| 28 | } |
| 29 | |
| 30 | return 0; |
| 31 | } |
| 32 | |
| 33 | static int fio_io_end(struct thread_data *td, struct io_u *io_u, int ret) |
| 34 | { |
| 35 | if (ret != (int) io_u->xfer_buflen) { |
| 36 | if (ret >= 0) { |
| 37 | io_u->resid = io_u->xfer_buflen - ret; |
| 38 | io_u->error = 0; |
| 39 | return FIO_Q_COMPLETED; |
| 40 | } else |
| 41 | io_u->error = errno; |
| 42 | } |
| 43 | |
| 44 | if (io_u->error) |
| 45 | td_verror(td, io_u->error, "xfer"); |
| 46 | |
| 47 | return FIO_Q_COMPLETED; |
| 48 | } |
| 49 | |
| 50 | static int fio_psyncio_queue(struct thread_data *td, struct io_u *io_u) |
| 51 | { |
| 52 | struct fio_file *f = io_u->file; |
| 53 | int ret; |
| 54 | |
| 55 | fio_ro_check(td, io_u); |
| 56 | |
| 57 | if (io_u->ddir == DDIR_READ) |
| 58 | ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
| 59 | else if (io_u->ddir == DDIR_WRITE) |
| 60 | ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
| 61 | else |
| 62 | ret = fsync(f->fd); |
| 63 | |
| 64 | return fio_io_end(td, io_u, ret); |
| 65 | } |
| 66 | |
| 67 | static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u) |
| 68 | { |
| 69 | struct fio_file *f = io_u->file; |
| 70 | int ret; |
| 71 | |
| 72 | fio_ro_check(td, io_u); |
| 73 | |
| 74 | if (io_u->ddir == DDIR_READ) |
| 75 | ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
| 76 | else if (io_u->ddir == DDIR_WRITE) |
| 77 | ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
| 78 | else |
| 79 | ret = fsync(f->fd); |
| 80 | |
| 81 | return fio_io_end(td, io_u, ret); |
| 82 | } |
| 83 | |
| 84 | static struct ioengine_ops ioengine_rw = { |
| 85 | .name = "sync", |
| 86 | .version = FIO_IOOPS_VERSION, |
| 87 | .prep = fio_syncio_prep, |
| 88 | .queue = fio_syncio_queue, |
| 89 | .open_file = generic_open_file, |
| 90 | .close_file = generic_close_file, |
| 91 | .flags = FIO_SYNCIO, |
| 92 | }; |
| 93 | |
| 94 | static struct ioengine_ops ioengine_prw = { |
| 95 | .name = "psync", |
| 96 | .version = FIO_IOOPS_VERSION, |
| 97 | .queue = fio_psyncio_queue, |
| 98 | .open_file = generic_open_file, |
| 99 | .close_file = generic_close_file, |
| 100 | .flags = FIO_SYNCIO, |
| 101 | }; |
| 102 | |
| 103 | static void fio_init fio_syncio_register(void) |
| 104 | { |
| 105 | register_ioengine(&ioengine_rw); |
| 106 | register_ioengine(&ioengine_prw); |
| 107 | } |
| 108 | |
| 109 | static void fio_exit fio_syncio_unregister(void) |
| 110 | { |
| 111 | unregister_ioengine(&ioengine_rw); |
| 112 | unregister_ioengine(&ioengine_prw); |
| 113 | } |