Commit | Line | Data |
---|---|---|
2866c82d | 1 | /* |
da751ca9 JA |
2 | * mmap engine |
3 | * | |
4 | * IO engine that reads/writes from files by doing memcpy to/from | |
5 | * a memory mapped region of the file. | |
2866c82d JA |
6 | * |
7 | */ | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <unistd.h> | |
11 | #include <errno.h> | |
12 | #include <assert.h> | |
13 | #include <sys/mman.h> | |
5f350952 JA |
14 | |
15 | #include "../fio.h" | |
2866c82d | 16 | |
2866c82d JA |
17 | static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) |
18 | { | |
53cdc686 JA |
19 | struct fio_file *f = io_u->file; |
20 | unsigned long long real_off = io_u->offset - f->file_offset; | |
2866c82d JA |
21 | |
22 | if (io_u->ddir == DDIR_READ) | |
cec6b55d | 23 | memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen); |
87dc1ab1 | 24 | else if (io_u->ddir == DDIR_WRITE) |
cec6b55d | 25 | memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen); |
b907a5b5 | 26 | else if (io_u->ddir == DDIR_SYNC) { |
7bb48f84 | 27 | size_t len = (f->io_size + page_size - 1) & ~page_mask; |
cfc99db7 JA |
28 | |
29 | if (msync(f->mmap, len, MS_SYNC)) { | |
b907a5b5 | 30 | io_u->error = errno; |
cfc99db7 JA |
31 | td_verror(td, io_u->error, "msync"); |
32 | } | |
b907a5b5 | 33 | } |
2866c82d JA |
34 | |
35 | /* | |
36 | * not really direct, but should drop the pages from the cache | |
37 | */ | |
2dc1bbeb | 38 | if (td->o.odirect && io_u->ddir != DDIR_SYNC) { |
cfc99db7 JA |
39 | size_t len = (io_u->xfer_buflen + page_size - 1) & ~page_mask; |
40 | unsigned long long off = real_off & ~page_mask; | |
41 | ||
42 | if (msync(f->mmap + off, len, MS_SYNC) < 0) { | |
2866c82d | 43 | io_u->error = errno; |
cfc99db7 JA |
44 | td_verror(td, io_u->error, "msync"); |
45 | } | |
46 | if (madvise(f->mmap + off, len, MADV_DONTNEED) < 0) { | |
2866c82d | 47 | io_u->error = errno; |
cfc99db7 JA |
48 | td_verror(td, io_u->error, "madvise"); |
49 | } | |
2866c82d JA |
50 | } |
51 | ||
36167d82 | 52 | return FIO_Q_COMPLETED; |
2866c82d JA |
53 | } |
54 | ||
b5af8293 JA |
55 | static int fio_mmapio_open(struct thread_data *td, struct fio_file *f) |
56 | { | |
57 | int ret, flags; | |
58 | ||
59 | ret = generic_open_file(td, f); | |
60 | if (ret) | |
61 | return ret; | |
62 | ||
c97d8369 JA |
63 | /* |
64 | * for size checkup, don't mmap anything. | |
65 | */ | |
66 | if (!f->io_size) | |
67 | return 0; | |
68 | ||
b5af8293 JA |
69 | if (td_rw(td)) |
70 | flags = PROT_READ | PROT_WRITE; | |
71 | else if (td_write(td)) { | |
72 | flags = PROT_WRITE; | |
73 | ||
2dc1bbeb | 74 | if (td->o.verify != VERIFY_NONE) |
b5af8293 JA |
75 | flags |= PROT_READ; |
76 | } else | |
77 | flags = PROT_READ; | |
78 | ||
7bb48f84 | 79 | f->mmap = mmap(NULL, f->io_size, flags, MAP_SHARED, f->fd, f->file_offset); |
b5af8293 JA |
80 | if (f->mmap == MAP_FAILED) { |
81 | f->mmap = NULL; | |
82 | td_verror(td, errno, "mmap"); | |
83 | goto err; | |
84 | } | |
85 | ||
86 | if (file_invalidate_cache(td, f)) | |
87 | goto err; | |
88 | ||
89 | if (!td_random(td)) { | |
7bb48f84 | 90 | if (madvise(f->mmap, f->io_size, MADV_SEQUENTIAL) < 0) { |
b5af8293 JA |
91 | td_verror(td, errno, "madvise"); |
92 | goto err; | |
93 | } | |
94 | } else { | |
7bb48f84 | 95 | if (madvise(f->mmap, f->io_size, MADV_RANDOM) < 0) { |
b5af8293 JA |
96 | td_verror(td, errno, "madvise"); |
97 | goto err; | |
98 | } | |
99 | } | |
100 | ||
101 | return 0; | |
102 | ||
103 | err: | |
0263882a | 104 | td->io_ops->close_file(td, f); |
b5af8293 JA |
105 | return 1; |
106 | } | |
107 | ||
108 | static void fio_mmapio_close(struct thread_data fio_unused *td, | |
109 | struct fio_file *f) | |
110 | { | |
111 | if (f->mmap) { | |
7bb48f84 | 112 | munmap(f->mmap, f->io_size); |
b5af8293 JA |
113 | f->mmap = NULL; |
114 | } | |
0263882a | 115 | generic_close_file(td, f); |
b5af8293 JA |
116 | } |
117 | ||
5f350952 | 118 | static struct ioengine_ops ioengine = { |
2866c82d JA |
119 | .name = "mmap", |
120 | .version = FIO_IOOPS_VERSION, | |
2866c82d | 121 | .queue = fio_mmapio_queue, |
b5af8293 JA |
122 | .open_file = fio_mmapio_open, |
123 | .close_file = fio_mmapio_close, | |
0263882a | 124 | .flags = FIO_SYNCIO | FIO_NOEXTEND, |
2866c82d | 125 | }; |
5f350952 JA |
126 | |
127 | static void fio_init fio_mmapio_register(void) | |
128 | { | |
129 | register_ioengine(&ioengine); | |
130 | } | |
131 | ||
132 | static void fio_exit fio_mmapio_unregister(void) | |
133 | { | |
134 | unregister_ioengine(&ioengine); | |
135 | } |