| /* |
| * null engine |
| * |
| * IO engine that doesn't do any real IO transfers, it just pretends to. |
| * The main purpose is to test fio itself. |
| * |
| * It also can act as external C++ engine - compiled with: |
| * |
| * g++ -O2 -g -shared -rdynamic -fPIC -o cpp_null null.c -DFIO_EXTERNAL_ENGINE |
| * |
| * to test it execute: |
| * |
| * LD_LIBRARY_PATH=./engines ./fio examples/cpp_null.fio |
| * |
| */ |
| #include <stdlib.h> |
| #include <assert.h> |
| |
| #include "../fio.h" |
| |
| struct null_data { |
| struct io_u **io_us; |
| int queued; |
| int events; |
| }; |
| |
| static struct io_u *null_event(struct null_data *nd, int event) |
| { |
| return nd->io_us[event]; |
| } |
| |
| static int null_getevents(struct null_data *nd, unsigned int min_events, |
| unsigned int fio_unused max, |
| const struct timespec fio_unused *t) |
| { |
| int ret = 0; |
| |
| if (min_events) { |
| ret = nd->events; |
| nd->events = 0; |
| } |
| |
| return ret; |
| } |
| |
| static int null_commit(struct thread_data *td, struct null_data *nd) |
| { |
| if (!nd->events) { |
| #ifndef FIO_EXTERNAL_ENGINE |
| io_u_mark_submit(td, nd->queued); |
| #endif |
| nd->events = nd->queued; |
| nd->queued = 0; |
| } |
| |
| return 0; |
| } |
| |
| static enum fio_q_status null_queue(struct thread_data *td, |
| struct null_data *nd, struct io_u *io_u) |
| { |
| fio_ro_check(td, io_u); |
| |
| if (td->io_ops->flags & FIO_SYNCIO) |
| return FIO_Q_COMPLETED; |
| if (nd->events) |
| return FIO_Q_BUSY; |
| |
| nd->io_us[nd->queued++] = io_u; |
| return FIO_Q_QUEUED; |
| } |
| |
| static int null_open(struct null_data fio_unused *nd, |
| struct fio_file fio_unused *f) |
| { |
| return 0; |
| } |
| |
| static void null_cleanup(struct null_data *nd) |
| { |
| if (nd) { |
| free(nd->io_us); |
| free(nd); |
| } |
| } |
| |
| static struct null_data *null_init(struct thread_data *td) |
| { |
| struct null_data *nd = (struct null_data *) malloc(sizeof(*nd)); |
| |
| memset(nd, 0, sizeof(*nd)); |
| |
| if (td->o.iodepth != 1) { |
| nd->io_us = (struct io_u **) malloc(td->o.iodepth * sizeof(struct io_u *)); |
| memset(nd->io_us, 0, td->o.iodepth * sizeof(struct io_u *)); |
| } else |
| td->io_ops->flags |= FIO_SYNCIO; |
| |
| return nd; |
| } |
| |
| #ifndef __cplusplus |
| |
| static struct io_u *fio_null_event(struct thread_data *td, int event) |
| { |
| return null_event(td->io_ops_data, event); |
| } |
| |
| static int fio_null_getevents(struct thread_data *td, unsigned int min_events, |
| unsigned int max, const struct timespec *t) |
| { |
| struct null_data *nd = td->io_ops_data; |
| return null_getevents(nd, min_events, max, t); |
| } |
| |
| static int fio_null_commit(struct thread_data *td) |
| { |
| return null_commit(td, td->io_ops_data); |
| } |
| |
| static enum fio_q_status fio_null_queue(struct thread_data *td, |
| struct io_u *io_u) |
| { |
| return null_queue(td, td->io_ops_data, io_u); |
| } |
| |
| static int fio_null_open(struct thread_data *td, struct fio_file *f) |
| { |
| return null_open(td->io_ops_data, f); |
| } |
| |
| static void fio_null_cleanup(struct thread_data *td) |
| { |
| null_cleanup(td->io_ops_data); |
| } |
| |
| static int fio_null_init(struct thread_data *td) |
| { |
| td->io_ops_data = null_init(td); |
| assert(td->io_ops_data); |
| return 0; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "null", |
| .version = FIO_IOOPS_VERSION, |
| .queue = fio_null_queue, |
| .commit = fio_null_commit, |
| .getevents = fio_null_getevents, |
| .event = fio_null_event, |
| .init = fio_null_init, |
| .cleanup = fio_null_cleanup, |
| .open_file = fio_null_open, |
| .flags = FIO_DISKLESSIO | FIO_FAKEIO, |
| }; |
| |
| static void fio_init fio_null_register(void) |
| { |
| register_ioengine(&ioengine); |
| } |
| |
| static void fio_exit fio_null_unregister(void) |
| { |
| unregister_ioengine(&ioengine); |
| } |
| |
| #else |
| |
| #ifdef FIO_EXTERNAL_ENGINE |
| |
| struct NullData { |
| NullData(struct thread_data *td) |
| { |
| impl_ = null_init(td); |
| assert(impl_); |
| } |
| |
| ~NullData() |
| { |
| null_cleanup(impl_); |
| } |
| |
| static NullData *get(struct thread_data *td) |
| { |
| return reinterpret_cast<NullData *>(td->io_ops_data); |
| } |
| |
| io_u *fio_null_event(struct thread_data *, int event) |
| { |
| return null_event(impl_, event); |
| } |
| |
| int fio_null_getevents(struct thread_data *, unsigned int min_events, |
| unsigned int max, const struct timespec *t) |
| { |
| return null_getevents(impl_, min_events, max, t); |
| } |
| |
| int fio_null_commit(struct thread_data *td) |
| { |
| return null_commit(td, impl_); |
| } |
| |
| int fio_null_queue(struct thread_data *td, struct io_u *io_u) |
| { |
| return null_queue(td, impl_, io_u); |
| } |
| |
| int fio_null_open(struct thread_data *, struct fio_file *f) |
| { |
| return null_open(impl_, f); |
| } |
| |
| private: |
| struct null_data *impl_; |
| }; |
| |
| extern "C" { |
| |
| static struct io_u *fio_null_event(struct thread_data *td, int event) |
| { |
| return NullData::get(td)->fio_null_event(td, event); |
| } |
| |
| static int fio_null_getevents(struct thread_data *td, unsigned int min_events, |
| unsigned int max, const struct timespec *t) |
| { |
| return NullData::get(td)->fio_null_getevents(td, min_events, max, t); |
| } |
| |
| static int fio_null_commit(struct thread_data *td) |
| { |
| return NullData::get(td)->fio_null_commit(td); |
| } |
| |
| static int fio_null_queue(struct thread_data *td, struct io_u *io_u) |
| { |
| return NullData::get(td)->fio_null_queue(td, io_u); |
| } |
| |
| static int fio_null_open(struct thread_data *td, struct fio_file *f) |
| { |
| return NullData::get(td)->fio_null_open(td, f); |
| } |
| |
| static int fio_null_init(struct thread_data *td) |
| { |
| td->io_ops_data = new NullData(td); |
| return 0; |
| } |
| |
| static void fio_null_cleanup(struct thread_data *td) |
| { |
| delete NullData::get(td); |
| } |
| |
| static struct ioengine_ops ioengine; |
| void get_ioengine(struct ioengine_ops **ioengine_ptr) |
| { |
| *ioengine_ptr = &ioengine; |
| |
| ioengine.name = "cpp_null"; |
| ioengine.version = FIO_IOOPS_VERSION; |
| ioengine.queue = fio_null_queue; |
| ioengine.commit = fio_null_commit; |
| ioengine.getevents = fio_null_getevents; |
| ioengine.event = fio_null_event; |
| ioengine.init = fio_null_init; |
| ioengine.cleanup = fio_null_cleanup; |
| ioengine.open_file = fio_null_open; |
| ioengine.flags = FIO_DISKLESSIO | FIO_FAKEIO; |
| } |
| } |
| #endif /* FIO_EXTERNAL_ENGINE */ |
| |
| #endif /* __cplusplus */ |