| 1 | /* |
| 2 | * native linux aio 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 | |
| 11 | #include "../fio.h" |
| 12 | #include "../os.h" |
| 13 | |
| 14 | #ifdef FIO_HAVE_LIBAIO |
| 15 | |
| 16 | #define ev_to_iou(ev) (struct io_u *) ((unsigned long) (ev)->obj) |
| 17 | |
| 18 | struct libaio_data { |
| 19 | io_context_t aio_ctx; |
| 20 | struct io_event *aio_events; |
| 21 | struct iocb **iocbs; |
| 22 | int iocbs_nr; |
| 23 | }; |
| 24 | |
| 25 | static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u) |
| 26 | { |
| 27 | struct fio_file *f = io_u->file; |
| 28 | |
| 29 | if (io_u->ddir == DDIR_READ) |
| 30 | io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
| 31 | else if (io_u->ddir == DDIR_WRITE) |
| 32 | io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset); |
| 33 | else if (io_u->ddir == DDIR_SYNC) |
| 34 | io_prep_fsync(&io_u->iocb, f->fd); |
| 35 | else |
| 36 | return 1; |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static struct io_u *fio_libaio_event(struct thread_data *td, int event) |
| 42 | { |
| 43 | struct libaio_data *ld = td->io_ops->data; |
| 44 | |
| 45 | return ev_to_iou(ld->aio_events + event); |
| 46 | } |
| 47 | |
| 48 | static int fio_libaio_getevents(struct thread_data *td, int min, int max, |
| 49 | struct timespec *t) |
| 50 | { |
| 51 | struct libaio_data *ld = td->io_ops->data; |
| 52 | long r; |
| 53 | |
| 54 | do { |
| 55 | r = io_getevents(ld->aio_ctx, min, max, ld->aio_events, t); |
| 56 | if (r >= min) |
| 57 | break; |
| 58 | else if (r == -EAGAIN) { |
| 59 | usleep(100); |
| 60 | continue; |
| 61 | } else if (r == -EINTR) |
| 62 | continue; |
| 63 | else if (r != 0) |
| 64 | break; |
| 65 | } while (1); |
| 66 | |
| 67 | return r; |
| 68 | } |
| 69 | |
| 70 | static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u) |
| 71 | { |
| 72 | struct libaio_data *ld = td->io_ops->data; |
| 73 | |
| 74 | if (ld->iocbs_nr == (int) td->iodepth) |
| 75 | return FIO_Q_BUSY; |
| 76 | |
| 77 | /* |
| 78 | * fsync is tricky, since it can fail and we need to do it |
| 79 | * serialized with other io. the reason is that linux doesn't |
| 80 | * support aio fsync yet. So return busy for the case where we |
| 81 | * have pending io, to let fio complete those first. |
| 82 | */ |
| 83 | if (io_u->ddir == DDIR_SYNC) { |
| 84 | if (ld->iocbs_nr) |
| 85 | return FIO_Q_BUSY; |
| 86 | if (fsync(io_u->file->fd) < 0) |
| 87 | io_u->error = errno; |
| 88 | |
| 89 | return FIO_Q_COMPLETED; |
| 90 | } |
| 91 | |
| 92 | ld->iocbs[ld->iocbs_nr] = &io_u->iocb; |
| 93 | ld->iocbs_nr++; |
| 94 | return FIO_Q_QUEUED; |
| 95 | } |
| 96 | |
| 97 | static int fio_libaio_commit(struct thread_data *td) |
| 98 | { |
| 99 | struct libaio_data *ld = td->io_ops->data; |
| 100 | struct iocb **iocbs; |
| 101 | int ret, iocbs_nr; |
| 102 | |
| 103 | if (!ld->iocbs_nr) |
| 104 | return 0; |
| 105 | |
| 106 | iocbs_nr = ld->iocbs_nr; |
| 107 | iocbs = ld->iocbs; |
| 108 | do { |
| 109 | ret = io_submit(ld->aio_ctx, iocbs_nr, iocbs); |
| 110 | if (ret == iocbs_nr) { |
| 111 | ret = 0; |
| 112 | break; |
| 113 | } else if (ret > 0) { |
| 114 | iocbs += ret; |
| 115 | iocbs_nr -= ret; |
| 116 | continue; |
| 117 | } else if (ret == -EAGAIN || !ret) |
| 118 | usleep(100); |
| 119 | else if (ret == -EINTR) |
| 120 | continue; |
| 121 | else |
| 122 | break; |
| 123 | } while (1); |
| 124 | |
| 125 | if (!ret) |
| 126 | ld->iocbs_nr = 0; |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u) |
| 132 | { |
| 133 | struct libaio_data *ld = td->io_ops->data; |
| 134 | |
| 135 | return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events); |
| 136 | } |
| 137 | |
| 138 | static void fio_libaio_cleanup(struct thread_data *td) |
| 139 | { |
| 140 | struct libaio_data *ld = td->io_ops->data; |
| 141 | |
| 142 | if (ld) { |
| 143 | io_destroy(ld->aio_ctx); |
| 144 | if (ld->aio_events) |
| 145 | free(ld->aio_events); |
| 146 | if (ld->iocbs) |
| 147 | free(ld->iocbs); |
| 148 | |
| 149 | free(ld); |
| 150 | td->io_ops->data = NULL; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | static int fio_libaio_init(struct thread_data *td) |
| 155 | { |
| 156 | struct libaio_data *ld = malloc(sizeof(*ld)); |
| 157 | |
| 158 | memset(ld, 0, sizeof(*ld)); |
| 159 | if (io_queue_init(td->iodepth, &ld->aio_ctx)) { |
| 160 | td_verror(td, errno); |
| 161 | free(ld); |
| 162 | return 1; |
| 163 | } |
| 164 | |
| 165 | ld->aio_events = malloc(td->iodepth * sizeof(struct io_event)); |
| 166 | memset(ld->aio_events, 0, td->iodepth * sizeof(struct io_event)); |
| 167 | ld->iocbs = malloc(td->iodepth * sizeof(struct iocb *)); |
| 168 | memset(ld->iocbs, 0, sizeof(struct iocb *)); |
| 169 | ld->iocbs_nr = 0; |
| 170 | |
| 171 | td->io_ops->data = ld; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static struct ioengine_ops ioengine = { |
| 176 | .name = "libaio", |
| 177 | .version = FIO_IOOPS_VERSION, |
| 178 | .init = fio_libaio_init, |
| 179 | .prep = fio_libaio_prep, |
| 180 | .queue = fio_libaio_queue, |
| 181 | .commit = fio_libaio_commit, |
| 182 | .cancel = fio_libaio_cancel, |
| 183 | .getevents = fio_libaio_getevents, |
| 184 | .event = fio_libaio_event, |
| 185 | .cleanup = fio_libaio_cleanup, |
| 186 | }; |
| 187 | |
| 188 | #else /* FIO_HAVE_LIBAIO */ |
| 189 | |
| 190 | /* |
| 191 | * When we have a proper configure system in place, we simply wont build |
| 192 | * and install this io engine. For now install a crippled version that |
| 193 | * just complains and fails to load. |
| 194 | */ |
| 195 | static int fio_libaio_init(struct thread_data fio_unused *td) |
| 196 | { |
| 197 | fprintf(stderr, "fio: libaio not available\n"); |
| 198 | return 1; |
| 199 | } |
| 200 | |
| 201 | static struct ioengine_ops ioengine = { |
| 202 | .name = "libaio", |
| 203 | .version = FIO_IOOPS_VERSION, |
| 204 | .init = fio_libaio_init, |
| 205 | }; |
| 206 | |
| 207 | #endif |
| 208 | |
| 209 | static void fio_init fio_libaio_register(void) |
| 210 | { |
| 211 | register_ioengine(&ioengine); |
| 212 | } |
| 213 | |
| 214 | static void fio_exit fio_libaio_unregister(void) |
| 215 | { |
| 216 | unregister_ioengine(&ioengine); |
| 217 | } |