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" | |
2866c82d | 15 | |
2866c82d JA |
16 | static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u) |
17 | { | |
53cdc686 JA |
18 | struct fio_file *f = io_u->file; |
19 | ||
87dc1ab1 JA |
20 | if (io_u->ddir == DDIR_SYNC) |
21 | return 0; | |
02bcaa8c JA |
22 | if (io_u->offset == f->last_completed_pos) |
23 | return 0; | |
87dc1ab1 | 24 | |
53cdc686 | 25 | if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) { |
e1161c32 | 26 | td_verror(td, errno, "lseek"); |
2866c82d JA |
27 | return 1; |
28 | } | |
29 | ||
30 | return 0; | |
31 | } | |
32 | ||
33 | static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u) | |
34 | { | |
53cdc686 | 35 | struct fio_file *f = io_u->file; |
cec6b55d | 36 | int ret; |
2866c82d JA |
37 | |
38 | if (io_u->ddir == DDIR_READ) | |
cec6b55d | 39 | ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
87dc1ab1 | 40 | else if (io_u->ddir == DDIR_WRITE) |
cec6b55d | 41 | ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen); |
87dc1ab1 JA |
42 | else |
43 | ret = fsync(f->fd); | |
2866c82d | 44 | |
cec6b55d | 45 | if (ret != (int) io_u->xfer_buflen) { |
22819ec2 | 46 | if (ret >= 0) { |
cec6b55d JA |
47 | io_u->resid = io_u->xfer_buflen - ret; |
48 | io_u->error = 0; | |
36167d82 | 49 | return FIO_Q_COMPLETED; |
2866c82d JA |
50 | } else |
51 | io_u->error = errno; | |
52 | } | |
53 | ||
36167d82 | 54 | if (io_u->error) |
e1161c32 | 55 | td_verror(td, io_u->error, "xfer"); |
2866c82d | 56 | |
36167d82 | 57 | return FIO_Q_COMPLETED; |
2866c82d JA |
58 | } |
59 | ||
5f350952 | 60 | static struct ioengine_ops ioengine = { |
2866c82d JA |
61 | .name = "sync", |
62 | .version = FIO_IOOPS_VERSION, | |
2866c82d JA |
63 | .prep = fio_syncio_prep, |
64 | .queue = fio_syncio_queue, | |
b5af8293 JA |
65 | .open_file = generic_open_file, |
66 | .close_file = generic_close_file, | |
2866c82d JA |
67 | .flags = FIO_SYNCIO, |
68 | }; | |
5f350952 JA |
69 | |
70 | static void fio_init fio_syncio_register(void) | |
71 | { | |
72 | register_ioengine(&ioengine); | |
73 | } | |
74 | ||
75 | static void fio_exit fio_syncio_unregister(void) | |
76 | { | |
77 | unregister_ioengine(&ioengine); | |
78 | } |