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); |
87dc1ab1 | 51 | else if (io_u->ddir == DDIR_WRITE) |
53cdc686 | 52 | memcpy(f->mmap + real_off, io_u->buf, io_u->buflen); |
b907a5b5 JA |
53 | else if (io_u->ddir == DDIR_SYNC) { |
54 | if (msync(f->mmap, f->file_size, MS_SYNC)) | |
55 | io_u->error = errno; | |
56 | } | |
2866c82d JA |
57 | |
58 | /* | |
59 | * not really direct, but should drop the pages from the cache | |
60 | */ | |
b907a5b5 | 61 | if (td->odirect && io_u->ddir != DDIR_SYNC) { |
53cdc686 | 62 | if (msync(f->mmap + real_off, io_u->buflen, MS_SYNC) < 0) |
2866c82d | 63 | io_u->error = errno; |
53cdc686 | 64 | if (madvise(f->mmap + real_off, io_u->buflen, MADV_DONTNEED) < 0) |
2866c82d JA |
65 | io_u->error = errno; |
66 | } | |
67 | ||
68 | if (!io_u->error) | |
69 | sd->last_io_u = io_u; | |
70 | ||
71 | return io_u->error; | |
72 | } | |
73 | ||
2866c82d JA |
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, | |
d9257bea | 99 | .flags = FIO_SYNCIO | FIO_MMAPIO, |
2866c82d | 100 | }; |