| /* |
| * regular read/write sync io engine |
| * |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <sys/mman.h> |
| |
| #include "../fio.h" |
| #include "../os.h" |
| |
| static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) |
| { |
| struct fio_file *f = io_u->file; |
| unsigned long long real_off = io_u->offset - f->file_offset; |
| |
| if (io_u->ddir == DDIR_READ) |
| memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen); |
| else if (io_u->ddir == DDIR_WRITE) |
| memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen); |
| else if (io_u->ddir == DDIR_SYNC) { |
| if (msync(f->mmap, f->file_size, MS_SYNC)) |
| io_u->error = errno; |
| } |
| |
| /* |
| * not really direct, but should drop the pages from the cache |
| */ |
| if (td->odirect && io_u->ddir != DDIR_SYNC) { |
| if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0) |
| io_u->error = errno; |
| if (madvise(f->mmap + real_off, io_u->xfer_buflen, MADV_DONTNEED) < 0) |
| io_u->error = errno; |
| } |
| |
| if (io_u->error) |
| td_verror(td, io_u->error); |
| |
| return FIO_Q_COMPLETED; |
| } |
| |
| static int fio_mmapio_init(struct thread_data *td) |
| { |
| struct fio_file *f; |
| int i; |
| |
| if (td->ddir == DDIR_READ && !td_rw(td)) |
| return 0; |
| |
| /* |
| * We need to truncate the files to the right size, if |
| * we are writing to it. |
| */ |
| for_each_file(td, f, i) { |
| if (ftruncate(f->fd, f->file_size) < 0) { |
| td_verror(td, errno); |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "mmap", |
| .version = FIO_IOOPS_VERSION, |
| .queue = fio_mmapio_queue, |
| .init = fio_mmapio_init, |
| .flags = FIO_SYNCIO | FIO_MMAPIO, |
| }; |
| |
| static void fio_init fio_mmapio_register(void) |
| { |
| register_ioengine(&ioengine); |
| } |
| |
| static void fio_exit fio_mmapio_unregister(void) |
| { |
| unregister_ioengine(&ioengine); |
| } |