| | 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> |
| | 11 | |
| | 12 | #include "../fio.h" |
| | 13 | #include "../os.h" |
| | 14 | |
| | 15 | static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) |
| | 16 | { |
| | 17 | struct fio_file *f = io_u->file; |
| | 18 | unsigned long long real_off = io_u->offset - f->file_offset; |
| | 19 | |
| | 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 | if (msync(f->mmap, f->file_size, MS_SYNC)) |
| | 26 | io_u->error = errno; |
| | 27 | } |
| | 28 | |
| | 29 | /* |
| | 30 | * not really direct, but should drop the pages from the cache |
| | 31 | */ |
| | 32 | if (td->odirect && io_u->ddir != DDIR_SYNC) { |
| | 33 | if (msync(f->mmap + real_off, io_u->xfer_buflen, MS_SYNC) < 0) |
| | 34 | io_u->error = errno; |
| | 35 | if (madvise(f->mmap + real_off, io_u->xfer_buflen, MADV_DONTNEED) < 0) |
| | 36 | io_u->error = errno; |
| | 37 | } |
| | 38 | |
| | 39 | if (io_u->error) |
| | 40 | td_verror(td, io_u->error, "sync"); |
| | 41 | |
| | 42 | return FIO_Q_COMPLETED; |
| | 43 | } |
| | 44 | |
| | 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: |
| | 88 | td->io_ops->close_file(td, f); |
| | 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 | } |
| | 99 | generic_close_file(td, f); |
| | 100 | } |
| | 101 | |
| | 102 | static struct ioengine_ops ioengine = { |
| | 103 | .name = "mmap", |
| | 104 | .version = FIO_IOOPS_VERSION, |
| | 105 | .queue = fio_mmapio_queue, |
| | 106 | .open_file = fio_mmapio_open, |
| | 107 | .close_file = fio_mmapio_close, |
| | 108 | .flags = FIO_SYNCIO | FIO_NOEXTEND, |
| | 109 | }; |
| | 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 | } |
projects / fio.git / blame_incremental