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 | } |