Commit | Line | Data |
---|---|---|
2866c82d JA |
1 | /* |
2 | * regular read/write sync io engine | |
3 | * | |
4 | */ | |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <unistd.h> | |
8 | #include <errno.h> | |
9 | #include <assert.h> | |
10 | #include <sys/mman.h> | |
5f350952 JA |
11 | |
12 | #include "../fio.h" | |
13 | #include "../os.h" | |
2866c82d JA |
14 | |
15 | struct mmapio_data { | |
16 | struct io_u *last_io_u; | |
17 | }; | |
18 | ||
19 | static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min, | |
20 | int max, struct timespec fio_unused *t) | |
21 | { | |
22 | assert(max <= 1); | |
23 | ||
24 | /* | |
25 | * we can only have one finished io_u for sync io, since the depth | |
26 | * is always 1 | |
27 | */ | |
28 | if (list_empty(&td->io_u_busylist)) | |
29 | return 0; | |
30 | ||
31 | return 1; | |
32 | } | |
33 | ||
34 | static struct io_u *fio_mmapio_event(struct thread_data *td, int event) | |
35 | { | |
36 | struct mmapio_data *sd = td->io_ops->data; | |
37 | ||
38 | assert(event == 0); | |
39 | ||
40 | return sd->last_io_u; | |
41 | } | |
42 | ||
43 | ||
44 | static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) | |
45 | { | |
53cdc686 JA |
46 | struct fio_file *f = io_u->file; |
47 | unsigned long long real_off = io_u->offset - f->file_offset; | |
2866c82d JA |
48 | struct mmapio_data *sd = td->io_ops->data; |
49 | ||
50 | if (io_u->ddir == DDIR_READ) | |
53cdc686 | 51 | memcpy(io_u->buf, f->mmap + real_off, io_u->buflen); |
87dc1ab1 | 52 | else if (io_u->ddir == DDIR_WRITE) |
53cdc686 | 53 | memcpy(f->mmap + real_off, io_u->buf, io_u->buflen); |
b907a5b5 JA |
54 | else if (io_u->ddir == DDIR_SYNC) { |
55 | if (msync(f->mmap, f->file_size, MS_SYNC)) | |
56 | io_u->error = errno; | |
57 | } | |
2866c82d JA |
58 | |
59 | /* | |
60 | * not really direct, but should drop the pages from the cache | |
61 | */ | |
b907a5b5 | 62 | if (td->odirect && io_u->ddir != DDIR_SYNC) { |
53cdc686 | 63 | if (msync(f->mmap + real_off, io_u->buflen, MS_SYNC) < 0) |
2866c82d | 64 | io_u->error = errno; |
53cdc686 | 65 | if (madvise(f->mmap + real_off, io_u->buflen, MADV_DONTNEED) < 0) |
2866c82d JA |
66 | io_u->error = errno; |
67 | } | |
68 | ||
69 | if (!io_u->error) | |
70 | sd->last_io_u = io_u; | |
71 | ||
72 | return io_u->error; | |
73 | } | |
74 | ||
2866c82d JA |
75 | static void fio_mmapio_cleanup(struct thread_data *td) |
76 | { | |
77 | if (td->io_ops->data) { | |
78 | free(td->io_ops->data); | |
79 | td->io_ops->data = NULL; | |
80 | } | |
81 | } | |
82 | ||
83 | static int fio_mmapio_init(struct thread_data *td) | |
84 | { | |
85 | struct mmapio_data *sd = malloc(sizeof(*sd)); | |
86 | ||
87 | sd->last_io_u = NULL; | |
88 | td->io_ops->data = sd; | |
89 | return 0; | |
90 | } | |
91 | ||
5f350952 | 92 | static struct ioengine_ops ioengine = { |
2866c82d JA |
93 | .name = "mmap", |
94 | .version = FIO_IOOPS_VERSION, | |
95 | .init = fio_mmapio_init, | |
96 | .queue = fio_mmapio_queue, | |
97 | .getevents = fio_mmapio_getevents, | |
98 | .event = fio_mmapio_event, | |
99 | .cleanup = fio_mmapio_cleanup, | |
d9257bea | 100 | .flags = FIO_SYNCIO | FIO_MMAPIO, |
2866c82d | 101 | }; |
5f350952 JA |
102 | |
103 | static void fio_init fio_mmapio_register(void) | |
104 | { | |
105 | register_ioengine(&ioengine); | |
106 | } | |
107 | ||
108 | static void fio_exit fio_mmapio_unregister(void) | |
109 | { | |
110 | unregister_ioengine(&ioengine); | |
111 | } |