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> | |
11 | #include "fio.h" | |
12 | #include "os.h" | |
13 | ||
14 | struct mmapio_data { | |
15 | struct io_u *last_io_u; | |
16 | }; | |
17 | ||
18 | static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min, | |
19 | int max, struct timespec fio_unused *t) | |
20 | { | |
21 | assert(max <= 1); | |
22 | ||
23 | /* | |
24 | * we can only have one finished io_u for sync io, since the depth | |
25 | * is always 1 | |
26 | */ | |
27 | if (list_empty(&td->io_u_busylist)) | |
28 | return 0; | |
29 | ||
30 | return 1; | |
31 | } | |
32 | ||
33 | static struct io_u *fio_mmapio_event(struct thread_data *td, int event) | |
34 | { | |
35 | struct mmapio_data *sd = td->io_ops->data; | |
36 | ||
37 | assert(event == 0); | |
38 | ||
39 | return sd->last_io_u; | |
40 | } | |
41 | ||
42 | ||
43 | static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) | |
44 | { | |
45 | unsigned long long real_off = io_u->offset - td->file_offset; | |
46 | struct mmapio_data *sd = td->io_ops->data; | |
47 | ||
48 | if (io_u->ddir == DDIR_READ) | |
49 | memcpy(io_u->buf, td->mmap + real_off, io_u->buflen); | |
50 | else | |
51 | memcpy(td->mmap + real_off, io_u->buf, io_u->buflen); | |
52 | ||
53 | /* | |
54 | * not really direct, but should drop the pages from the cache | |
55 | */ | |
56 | if (td->odirect) { | |
57 | if (msync(td->mmap + real_off, io_u->buflen, MS_SYNC) < 0) | |
58 | io_u->error = errno; | |
59 | if (madvise(td->mmap + real_off, io_u->buflen, MADV_DONTNEED) < 0) | |
60 | io_u->error = errno; | |
61 | } | |
62 | ||
63 | if (!io_u->error) | |
64 | sd->last_io_u = io_u; | |
65 | ||
66 | return io_u->error; | |
67 | } | |
68 | ||
69 | static int fio_mmapio_sync(struct thread_data *td) | |
70 | { | |
71 | return msync(td->mmap, td->file_size, MS_SYNC); | |
72 | } | |
73 | ||
74 | static void fio_mmapio_cleanup(struct thread_data *td) | |
75 | { | |
76 | if (td->io_ops->data) { | |
77 | free(td->io_ops->data); | |
78 | td->io_ops->data = NULL; | |
79 | } | |
80 | } | |
81 | ||
82 | static int fio_mmapio_init(struct thread_data *td) | |
83 | { | |
84 | struct mmapio_data *sd = malloc(sizeof(*sd)); | |
85 | ||
86 | sd->last_io_u = NULL; | |
87 | td->io_ops->data = sd; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | struct ioengine_ops ioengine = { | |
92 | .name = "mmap", | |
93 | .version = FIO_IOOPS_VERSION, | |
94 | .init = fio_mmapio_init, | |
95 | .queue = fio_mmapio_queue, | |
96 | .getevents = fio_mmapio_getevents, | |
97 | .event = fio_mmapio_event, | |
98 | .cleanup = fio_mmapio_cleanup, | |
99 | .sync = fio_mmapio_sync, | |
100 | .flags = FIO_SYNCIO, | |
101 | }; |