| /* |
| * binject engine |
| * |
| * IO engine that uses the Linux binject interface to directly inject |
| * bio's to block devices. |
| * |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <string.h> |
| #include <sys/poll.h> |
| |
| #include "../fio.h" |
| |
| #ifdef FIO_HAVE_BINJECT |
| |
| struct binject_data { |
| struct b_user_cmd *cmds; |
| struct io_u **events; |
| struct pollfd *pfds; |
| int *fd_flags; |
| unsigned int bs; |
| }; |
| |
| static void binject_buc_init(struct binject_data *bd, struct io_u *io_u) |
| { |
| struct b_user_cmd *buc = &io_u->buc; |
| |
| memset(buc, 0, sizeof(*buc)); |
| binject_buc_set_magic(buc); |
| |
| buc->buf = (unsigned long) io_u->xfer_buf; |
| buc->len = io_u->xfer_buflen; |
| buc->offset = io_u->offset; |
| buc->usr_ptr = (unsigned long) io_u; |
| |
| buc->flags = B_FLAG_NOIDLE | B_FLAG_UNPLUG; |
| assert(buc->buf); |
| } |
| |
| static int pollin_events(struct pollfd *pfds, int fds) |
| { |
| int i; |
| |
| for (i = 0; i < fds; i++) |
| if (pfds[i].revents & POLLIN) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int fio_binject_getevents(struct thread_data *td, unsigned int min, |
| unsigned int max, struct timespec fio_unused *t) |
| { |
| struct binject_data *bd = td->io_ops->data; |
| int left = max, ret, r = 0, ev_index = 0; |
| void *buf = bd->cmds; |
| unsigned int i, events; |
| struct fio_file *f; |
| |
| /* |
| * Fill in the file descriptors |
| */ |
| for_each_file(td, f, i) { |
| /* |
| * don't block for min events == 0 |
| */ |
| if (!min) { |
| bd->fd_flags[i] = fcntl(f->fd, F_GETFL); |
| fcntl(f->fd, F_SETFL, bd->fd_flags[i] | O_NONBLOCK); |
| } |
| bd->pfds[i].fd = f->fd; |
| bd->pfds[i].events = POLLIN; |
| } |
| |
| while (left) { |
| void *p; |
| |
| do { |
| if (!min) |
| break; |
| |
| ret = poll(bd->pfds, td->o.nr_files, -1); |
| if (ret < 0) { |
| if (!r) |
| r = -errno; |
| td_verror(td, errno, "poll"); |
| break; |
| } else if (!ret) |
| continue; |
| |
| if (pollin_events(bd->pfds, td->o.nr_files)) |
| break; |
| } while (1); |
| |
| if (r < 0) |
| break; |
| |
| re_read: |
| p = buf; |
| events = 0; |
| for_each_file(td, f, i) { |
| ret = read(f->fd, p, left * sizeof(struct b_user_cmd)); |
| if (ret < 0) { |
| if (errno == EAGAIN) |
| continue; |
| r = -errno; |
| td_verror(td, errno, "read"); |
| break; |
| } else if (ret) { |
| p += ret; |
| events += ret / sizeof(struct b_user_cmd); |
| } |
| } |
| |
| if (r < 0) |
| break; |
| if (!events) { |
| usleep(1000); |
| goto re_read; |
| } |
| |
| left -= events; |
| r += events; |
| |
| for (i = 0; i < events; i++) { |
| struct b_user_cmd *buc = (struct b_user_cmd *) buf + i; |
| |
| bd->events[ev_index] = (struct io_u *) buc->usr_ptr; |
| ev_index++; |
| } |
| } |
| |
| if (!min) { |
| for_each_file(td, f, i) |
| fcntl(f->fd, F_SETFL, bd->fd_flags[i]); |
| } |
| |
| if (r > 0) |
| assert(ev_index == r); |
| |
| return r; |
| } |
| |
| static int fio_binject_doio(struct thread_data *td, struct io_u *io_u) |
| { |
| struct b_user_cmd *buc = &io_u->buc; |
| struct fio_file *f = io_u->file; |
| int ret; |
| |
| ret = write(f->fd, buc, sizeof(*buc)); |
| if (ret < 0) |
| return ret; |
| |
| return FIO_Q_QUEUED; |
| } |
| |
| static int fio_binject_prep(struct thread_data *td, struct io_u *io_u) |
| { |
| struct binject_data *bd = td->io_ops->data; |
| struct b_user_cmd *buc = &io_u->buc; |
| |
| bd->bs = 512; |
| |
| if (io_u->xfer_buflen & (bd->bs - 1)) { |
| log_err("read/write not sector aligned\n"); |
| return EINVAL; |
| } |
| |
| if (io_u->ddir == DDIR_READ) { |
| binject_buc_init(bd, io_u); |
| buc->type = B_TYPE_READ; |
| } else if (io_u->ddir == DDIR_WRITE) { |
| binject_buc_init(bd, io_u); |
| buc->type = B_TYPE_WRITEZERO; |
| } else if (io_u->ddir == DDIR_TRIM) { |
| binject_buc_init(bd, io_u); |
| buc->type = B_TYPE_DISCARD; |
| } else { |
| assert(0); |
| } |
| |
| return 0; |
| } |
| |
| static int fio_binject_queue(struct thread_data *td, struct io_u *io_u) |
| { |
| int ret; |
| |
| fio_ro_check(td, io_u); |
| |
| ret = fio_binject_doio(td, io_u); |
| |
| if (ret < 0) |
| io_u->error = errno; |
| |
| if (io_u->error) { |
| td_verror(td, io_u->error, "xfer"); |
| return FIO_Q_COMPLETED; |
| } |
| |
| return ret; |
| } |
| |
| static struct io_u *fio_binject_event(struct thread_data *td, int event) |
| { |
| struct binject_data *bd = td->io_ops->data; |
| |
| return bd->events[event]; |
| } |
| |
| static void fio_binject_cleanup(struct thread_data *td) |
| { |
| struct binject_data *bd = td->io_ops->data; |
| |
| if (bd) { |
| free(bd->events); |
| free(bd->cmds); |
| free(bd->fd_flags); |
| free(bd->pfds); |
| free(bd); |
| } |
| } |
| |
| static int fio_binject_init(struct thread_data *td) |
| { |
| struct binject_data *bd; |
| |
| bd = malloc(sizeof(*bd)); |
| memset(bd, 0, sizeof(*bd)); |
| |
| bd->cmds = malloc(td->o.iodepth * sizeof(struct b_user_cmd)); |
| memset(bd->cmds, 0, td->o.iodepth * sizeof(struct b_user_cmd)); |
| |
| bd->events = malloc(td->o.iodepth * sizeof(struct io_u *)); |
| memset(bd->events, 0, td->o.iodepth * sizeof(struct io_u *)); |
| |
| bd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files); |
| memset(bd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files); |
| |
| bd->fd_flags = malloc(sizeof(int) * td->o.nr_files); |
| memset(bd->fd_flags, 0, sizeof(int) * td->o.nr_files); |
| |
| td->io_ops->data = bd; |
| return 0; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "binject", |
| .version = FIO_IOOPS_VERSION, |
| .init = fio_binject_init, |
| .prep = fio_binject_prep, |
| .queue = fio_binject_queue, |
| .getevents = fio_binject_getevents, |
| .event = fio_binject_event, |
| .cleanup = fio_binject_cleanup, |
| .open_file = generic_open_file, |
| .close_file = generic_close_file, |
| .get_file_size = generic_get_file_size, |
| .flags = FIO_RAWIO, |
| }; |
| |
| #else /* FIO_HAVE_BINJECT */ |
| |
| /* |
| * When we have a proper configure system in place, we simply wont build |
| * and install this io engine. For now install a crippled version that |
| * just complains and fails to load. |
| */ |
| static int fio_binject_init(struct thread_data fio_unused *td) |
| { |
| fprintf(stderr, "fio: ioengine binject not available\n"); |
| return 1; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "binject", |
| .version = FIO_IOOPS_VERSION, |
| .init = fio_binject_init, |
| }; |
| |
| #endif |
| |
| static void fio_init fio_binject_register(void) |
| { |
| register_ioengine(&ioengine); |
| } |
| |
| static void fio_exit fio_binject_unregister(void) |
| { |
| unregister_ioengine(&ioengine); |
| } |