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