projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| 2866c82d JA |
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 | #include "fio.h" | |
| 12 | #include "os.h" | |
| 13 | ||
| 14 | struct mmapio_data { | |
| 15 | struct io_u *last_io_u; | |
| 16 | }; | |
| 17 | ||
| 18 | static int fio_mmapio_getevents(struct thread_data *td, int fio_unused min, | |
| 19 | int max, struct timespec fio_unused *t) | |
| 20 | { | |
| 21 | assert(max <= 1); | |
| 22 | ||
| 23 | /* | |
| 24 | * we can only have one finished io_u for sync io, since the depth | |
| 25 | * is always 1 | |
| 26 | */ | |
| 27 | if (list_empty(&td->io_u_busylist)) | |
| 28 | return 0; | |
| 29 | ||
| 30 | return 1; | |
| 31 | } | |
| 32 | ||
| 33 | static struct io_u *fio_mmapio_event(struct thread_data *td, int event) | |
| 34 | { | |
| 35 | struct mmapio_data *sd = td->io_ops->data; | |
| 36 | ||
| 37 | assert(event == 0); | |
| 38 | ||
| 39 | return sd->last_io_u; | |
| 40 | } | |
| 41 | ||
| 42 | ||
| 43 | static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u) | |
| 44 | { | |
| 53cdc686 JA |
45 | struct fio_file *f = io_u->file; |
| 46 | unsigned long long real_off = io_u->offset - f->file_offset; | |
| 2866c82d JA |
47 | struct mmapio_data *sd = td->io_ops->data; |
| 48 | ||
| 49 | if (io_u->ddir == DDIR_READ) | |
| 53cdc686 | 50 | memcpy(io_u->buf, f->mmap + real_off, io_u->buflen); |
| 87dc1ab1 | 51 | else if (io_u->ddir == DDIR_WRITE) |
| 53cdc686 | 52 | memcpy(f->mmap + real_off, io_u->buf, io_u->buflen); |
| b907a5b5 JA |
53 | else if (io_u->ddir == DDIR_SYNC) { |
| 54 | if (msync(f->mmap, f->file_size, MS_SYNC)) | |
| 55 | io_u->error = errno; | |
| 56 | } | |
| 2866c82d JA |
57 | |
| 58 | /* | |
| 59 | * not really direct, but should drop the pages from the cache | |
| 60 | */ | |
| b907a5b5 | 61 | if (td->odirect && io_u->ddir != DDIR_SYNC) { |
| 53cdc686 | 62 | if (msync(f->mmap + real_off, io_u->buflen, MS_SYNC) < 0) |
| 2866c82d | 63 | io_u->error = errno; |
| 53cdc686 | 64 | if (madvise(f->mmap + real_off, io_u->buflen, MADV_DONTNEED) < 0) |
| 2866c82d JA |
65 | io_u->error = errno; |
| 66 | } | |
| 67 | ||
| 68 | if (!io_u->error) | |
| 69 | sd->last_io_u = io_u; | |
| 70 | ||
| 71 | return io_u->error; | |
| 72 | } | |
| 73 | ||
| 2866c82d JA |
74 | static void fio_mmapio_cleanup(struct thread_data *td) |
| 75 | { | |
| 76 | if (td->io_ops->data) { | |
| 77 | free(td->io_ops->data); | |
| 78 | td->io_ops->data = NULL; | |
| 79 | } | |
| 80 | } | |
| 81 | ||
| 82 | static int fio_mmapio_init(struct thread_data *td) | |
| 83 | { | |
| 84 | struct mmapio_data *sd = malloc(sizeof(*sd)); | |
| 85 | ||
| 86 | sd->last_io_u = NULL; | |
| 87 | td->io_ops->data = sd; | |
| 88 | return 0; | |
| 89 | } | |
| 90 | ||
| 91 | struct ioengine_ops ioengine = { | |
| 92 | .name = "mmap", | |
| 93 | .version = FIO_IOOPS_VERSION, | |
| 94 | .init = fio_mmapio_init, | |
| 95 | .queue = fio_mmapio_queue, | |
| 96 | .getevents = fio_mmapio_getevents, | |
| 97 | .event = fio_mmapio_event, | |
| 98 | .cleanup = fio_mmapio_cleanup, | |
| d9257bea | 99 | .flags = FIO_SYNCIO | FIO_MMAPIO, |
| 2866c82d | 100 | }; |