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 | { | |
53cdc686 JA |
45 | struct fio_file *f = io_u->file; |
46 | unsigned long long real_off = io_u->offset - f->file_offset; | |
2866c82d JA |
47 | struct mmapio_data *sd = td->io_ops->data; |
48 | ||
49 | if (io_u->ddir == DDIR_READ) | |
53cdc686 | 50 | memcpy(io_u->buf, f->mmap + real_off, io_u->buflen); |
2866c82d | 51 | else |
53cdc686 | 52 | memcpy(f->mmap + real_off, io_u->buf, io_u->buflen); |
2866c82d JA |
53 | |
54 | /* | |
55 | * not really direct, but should drop the pages from the cache | |
56 | */ | |
57 | if (td->odirect) { | |
53cdc686 | 58 | if (msync(f->mmap + real_off, io_u->buflen, MS_SYNC) < 0) |
2866c82d | 59 | io_u->error = errno; |
53cdc686 | 60 | if (madvise(f->mmap + real_off, io_u->buflen, MADV_DONTNEED) < 0) |
2866c82d JA |
61 | io_u->error = errno; |
62 | } | |
63 | ||
64 | if (!io_u->error) | |
65 | sd->last_io_u = io_u; | |
66 | ||
67 | return io_u->error; | |
68 | } | |
69 | ||
7a16dd02 JA |
70 | static int fio_mmapio_sync(struct thread_data fio_unused *td, |
71 | struct fio_file *f) | |
2866c82d | 72 | { |
53cdc686 | 73 | return msync(f->mmap, f->file_size, MS_SYNC); |
2866c82d JA |
74 | } |
75 | ||
76 | static void fio_mmapio_cleanup(struct thread_data *td) | |
77 | { | |
78 | if (td->io_ops->data) { | |
79 | free(td->io_ops->data); | |
80 | td->io_ops->data = NULL; | |
81 | } | |
82 | } | |
83 | ||
84 | static int fio_mmapio_init(struct thread_data *td) | |
85 | { | |
86 | struct mmapio_data *sd = malloc(sizeof(*sd)); | |
87 | ||
88 | sd->last_io_u = NULL; | |
89 | td->io_ops->data = sd; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | struct ioengine_ops ioengine = { | |
94 | .name = "mmap", | |
95 | .version = FIO_IOOPS_VERSION, | |
96 | .init = fio_mmapio_init, | |
97 | .queue = fio_mmapio_queue, | |
98 | .getevents = fio_mmapio_getevents, | |
99 | .event = fio_mmapio_event, | |
100 | .cleanup = fio_mmapio_cleanup, | |
101 | .sync = fio_mmapio_sync, | |
d9257bea | 102 | .flags = FIO_SYNCIO | FIO_MMAPIO, |
2866c82d | 103 | }; |