Allow explicit setting of a number of files
[fio.git] / engines / mmap.c
CommitLineData
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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>
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11
12#include "../fio.h"
13#include "../os.h"
2866c82d 14
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15static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
16{
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17 struct fio_file *f = io_u->file;
18 unsigned long long real_off = io_u->offset - f->file_offset;
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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);
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24 else if (io_u->ddir == DDIR_SYNC) {
25 if (msync(f->mmap, f->file_size, MS_SYNC))
26 io_u->error = errno;
27 }
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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)
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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;
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43}
44
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45static 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
87err:
0263882a 88 td->io_ops->close_file(td, f);
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89 return 1;
90}
91
92static 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);
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100}
101
5f350952 102static struct ioengine_ops ioengine = {
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103 .name = "mmap",
104 .version = FIO_IOOPS_VERSION,
2866c82d 105 .queue = fio_mmapio_queue,
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106 .open_file = fio_mmapio_open,
107 .close_file = fio_mmapio_close,
0263882a 108 .flags = FIO_SYNCIO | FIO_NOEXTEND,
2866c82d 109};
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110
111static void fio_init fio_mmapio_register(void)
112{
113 register_ioengine(&ioengine);
114}
115
116static void fio_exit fio_mmapio_unregister(void)
117{
118 unregister_ioengine(&ioengine);
119}