Duplicate name checks in ioengines.c
[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_init(struct thread_data *td)
46{
47 struct fio_file *f;
48 int i;
49
413dd459 50 if (!td_write(td))
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51 return 0;
52
53 /*
54 * We need to truncate the files to the right size, if
55 * we are writing to it.
56 */
57 for_each_file(td, f, i) {
58 if (ftruncate(f->fd, f->file_size) < 0) {
e1161c32 59 td_verror(td, errno, "ftruncate");
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60 return 1;
61 }
62 }
63
64 return 0;
65}
66
5f350952 67static struct ioengine_ops ioengine = {
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68 .name = "mmap",
69 .version = FIO_IOOPS_VERSION,
2866c82d 70 .queue = fio_mmapio_queue,
948f9b2e 71 .init = fio_mmapio_init,
d9257bea 72 .flags = FIO_SYNCIO | FIO_MMAPIO,
2866c82d 73};
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74
75static void fio_init fio_mmapio_register(void)
76{
77 register_ioengine(&ioengine);
78}
79
80static void fio_exit fio_mmapio_unregister(void)
81{
82 unregister_ioengine(&ioengine);
83}