projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| 2866c82d | 1 | /* |
| da751ca9 JA |
2 | * sync engine |
| 3 | * | |
| 4 | * IO engine that does regular read(2)/write(2) with lseek(2) to transfer | |
| 5 | * data. | |
| 2866c82d JA |
6 | * |
| 7 | */ | |
| 8 | #include <stdio.h> | |
| 9 | #include <stdlib.h> | |
| 10 | #include <unistd.h> | |
| 11 | #include <errno.h> | |
| 12 | #include <assert.h> | |
| 5f350952 JA |
13 | |
| 14 | #include "../fio.h" | |
| 15 | #include "../os.h" | |
| 2866c82d | 16 | |
| 2866c82d JA |
17 | static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u) |
| 18 | { | |
| 53cdc686 JA |
19 | struct fio_file *f = io_u->file; |
| 20 | ||
| 87dc1ab1 JA |
21 | if (io_u->ddir == DDIR_SYNC) |
| 22 | return 0; | |
| 02bcaa8c JA |
23 | if (io_u->offset == f->last_completed_pos) |
| 24 | return 0; | |
| 87dc1ab1 | 25 | |
| 53cdc686 | 26 | if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) { |
| e1161c32 | 27 | td_verror(td, errno, "lseek"); |
| 2866c82d JA |
28 | return 1; |
| 29 | } | |
| 30 | ||
| 31 | return 0; | |
| 32 | } | |
| 33 | ||
| 34 | static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u) | |
| 35 | { | |
| 53cdc686 | 36 | struct fio_file *f = io_u->file; |
| cec6b55d | 37 | int ret; |
| 2866c82d JA |
38 | |
| 39 | if (io_u->ddir == DDIR_READ) | |
| cec6b55d | 40 | ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
| 87dc1ab1 | 41 | else if (io_u->ddir == DDIR_WRITE) |
| cec6b55d | 42 | ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
| 87dc1ab1 JA |
43 | else |
| 44 | ret = fsync(f->fd); | |
| 2866c82d | 45 | |
| cec6b55d | 46 | if (ret != (int) io_u->xfer_buflen) { |
| 22819ec2 | 47 | if (ret >= 0) { |
| cec6b55d JA |
48 | io_u->resid = io_u->xfer_buflen - ret; |
| 49 | io_u->error = 0; | |
| 36167d82 | 50 | return FIO_Q_COMPLETED; |
| 2866c82d JA |
51 | } else |
| 52 | io_u->error = errno; | |
| 53 | } | |
| 54 | ||
| 36167d82 | 55 | if (io_u->error) |
| e1161c32 | 56 | td_verror(td, io_u->error, "xfer"); |
| 2866c82d | 57 | |
| 36167d82 | 58 | return FIO_Q_COMPLETED; |
| 2866c82d JA |
59 | } |
| 60 | ||
| 5f350952 | 61 | static struct ioengine_ops ioengine = { |
| 2866c82d JA |
62 | .name = "sync", |
| 63 | .version = FIO_IOOPS_VERSION, | |
| 2866c82d JA |
64 | .prep = fio_syncio_prep, |
| 65 | .queue = fio_syncio_queue, | |
| b5af8293 JA |
66 | .open_file = generic_open_file, |
| 67 | .close_file = generic_close_file, | |
| 2866c82d JA |
68 | .flags = FIO_SYNCIO, |
| 69 | }; | |
| 5f350952 JA |
70 | |
| 71 | static void fio_init fio_syncio_register(void) | |
| 72 | { | |
| 73 | register_ioengine(&ioengine); | |
| 74 | } | |
| 75 | ||
| 76 | static void fio_exit fio_syncio_unregister(void) | |
| 77 | { | |
| 78 | unregister_ioengine(&ioengine); | |
| 79 | } |