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 JA |
24 | else if (io_u->ddir == DDIR_SYNC) { |
25 | if (msync(f->mmap, f->file_size, MS_SYNC)) | |
26 | io_u->error = errno; | |
27 | } | |
2866c82d JA |
28 | |
29 | /* | |
30 | * not really direct, but should drop the pages from the cache | |
31 | */ | |
b907a5b5 | 32 | if (td->odirect && io_u->ddir != DDIR_SYNC) { |
cec6b55d | 33 | if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0) |
2866c82d | 34 | io_u->error = errno; |
cec6b55d | 35 | if (madvise(f->mmap + real_off, io_u->xfer_buflen, MADV_DONTNEED) < 0) |
2866c82d JA |
36 | io_u->error = errno; |
37 | } | |
38 | ||
36167d82 | 39 | if (io_u->error) |
e1161c32 | 40 | td_verror(td, io_u->error, "sync"); |
2866c82d | 41 | |
36167d82 | 42 | return FIO_Q_COMPLETED; |
2866c82d JA |
43 | } |
44 | ||
b5af8293 JA |
45 | static int fio_mmapio_open(struct thread_data *td, struct fio_file *f) |
46 | { | |
47 | int ret, flags; | |
48 | ||
49 | ret = generic_open_file(td, f); | |
50 | if (ret) | |
51 | return ret; | |
52 | ||
53 | if (td_rw(td)) | |
54 | flags = PROT_READ | PROT_WRITE; | |
55 | else if (td_write(td)) { | |
56 | flags = PROT_WRITE; | |
57 | ||
58 | if (td->verify != VERIFY_NONE) | |
59 | flags |= PROT_READ; | |
60 | } else | |
61 | flags = PROT_READ; | |
62 | ||
63 | f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset); | |
64 | if (f->mmap == MAP_FAILED) { | |
65 | f->mmap = NULL; | |
66 | td_verror(td, errno, "mmap"); | |
67 | goto err; | |
68 | } | |
69 | ||
70 | if (file_invalidate_cache(td, f)) | |
71 | goto err; | |
72 | ||
73 | if (!td_random(td)) { | |
74 | if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) { | |
75 | td_verror(td, errno, "madvise"); | |
76 | goto err; | |
77 | } | |
78 | } else { | |
79 | if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) { | |
80 | td_verror(td, errno, "madvise"); | |
81 | goto err; | |
82 | } | |
83 | } | |
84 | ||
85 | return 0; | |
86 | ||
87 | err: | |
0263882a | 88 | td->io_ops->close_file(td, f); |
b5af8293 JA |
89 | return 1; |
90 | } | |
91 | ||
92 | static void fio_mmapio_close(struct thread_data fio_unused *td, | |
93 | struct fio_file *f) | |
94 | { | |
95 | if (f->mmap) { | |
96 | munmap(f->mmap, f->file_size); | |
97 | f->mmap = NULL; | |
98 | } | |
0263882a | 99 | generic_close_file(td, f); |
b5af8293 JA |
100 | } |
101 | ||
5f350952 | 102 | static struct ioengine_ops ioengine = { |
2866c82d JA |
103 | .name = "mmap", |
104 | .version = FIO_IOOPS_VERSION, | |
2866c82d | 105 | .queue = fio_mmapio_queue, |
b5af8293 JA |
106 | .open_file = fio_mmapio_open, |
107 | .close_file = fio_mmapio_close, | |
0263882a | 108 | .flags = FIO_SYNCIO | FIO_NOEXTEND, |
2866c82d | 109 | }; |
5f350952 JA |
110 | |
111 | static void fio_init fio_mmapio_register(void) | |
112 | { | |
113 | register_ioengine(&ioengine); | |
114 | } | |
115 | ||
116 | static void fio_exit fio_mmapio_unregister(void) | |
117 | { | |
118 | unregister_ioengine(&ioengine); | |
119 | } |