2 * regular read/write sync io engine
15 static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
17 struct fio_file *f = io_u->file;
18 unsigned long long real_off = io_u->offset - f->file_offset;
20 if (io_u->ddir == DDIR_READ)
21 memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
22 else if (io_u->ddir == DDIR_WRITE)
23 memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
24 else if (io_u->ddir == DDIR_SYNC) {
25 size_t len = (f->file_size + page_size - 1) & ~page_mask;
27 if (msync(f->mmap, len, MS_SYNC)) {
29 td_verror(td, io_u->error, "msync");
34 * not really direct, but should drop the pages from the cache
36 if (td->odirect && io_u->ddir != DDIR_SYNC) {
37 size_t len = (io_u->xfer_buflen + page_size - 1) & ~page_mask;
38 unsigned long long off = real_off & ~page_mask;
40 if (msync(f->mmap + off, len, MS_SYNC) < 0) {
42 td_verror(td, io_u->error, "msync");
44 if (madvise(f->mmap + off, len, MADV_DONTNEED) < 0) {
46 td_verror(td, io_u->error, "madvise");
50 return FIO_Q_COMPLETED;
53 static int fio_mmapio_open(struct thread_data *td, struct fio_file *f)
57 ret = generic_open_file(td, f);
62 flags = PROT_READ | PROT_WRITE;
63 else if (td_write(td)) {
66 if (td->verify != VERIFY_NONE)
71 f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
72 if (f->mmap == MAP_FAILED) {
74 td_verror(td, errno, "mmap");
78 if (file_invalidate_cache(td, f))
82 if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
83 td_verror(td, errno, "madvise");
87 if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
88 td_verror(td, errno, "madvise");
96 td->io_ops->close_file(td, f);
100 static void fio_mmapio_close(struct thread_data fio_unused *td,
104 munmap(f->mmap, f->file_size);
107 generic_close_file(td, f);
110 static struct ioengine_ops ioengine = {
112 .version = FIO_IOOPS_VERSION,
113 .queue = fio_mmapio_queue,
114 .open_file = fio_mmapio_open,
115 .close_file = fio_mmapio_close,
116 .flags = FIO_SYNCIO | FIO_NOEXTEND,
119 static void fio_init fio_mmapio_register(void)
121 register_ioengine(&ioengine);
124 static void fio_exit fio_mmapio_unregister(void)
126 unregister_ioengine(&ioengine);