4 * IO engine that does regular read(2)/write(2) with lseek(2) to transfer
5 * data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
22 unsigned long queued_bytes;
24 unsigned long long last_offset;
25 struct fio_file *last_file;
26 enum fio_ddir last_ddir;
29 static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
31 struct fio_file *f = io_u->file;
33 if (ddir_sync(io_u->ddir))
36 if (f->file_pos != -1ULL && f->file_pos == io_u->offset)
39 if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
40 td_verror(td, errno, "lseek");
47 static int fio_io_end(struct thread_data *td, struct io_u *io_u, int ret)
49 if (io_u->file && ret >= 0)
50 io_u->file->file_pos = io_u->offset + ret;
52 if (ret != (int) io_u->xfer_buflen) {
54 io_u->resid = io_u->xfer_buflen - ret;
56 return FIO_Q_COMPLETED;
62 td_verror(td, io_u->error, "xfer");
64 return FIO_Q_COMPLETED;
67 static int fio_psyncio_queue(struct thread_data *td, struct io_u *io_u)
69 struct fio_file *f = io_u->file;
72 fio_ro_check(td, io_u);
74 if (io_u->ddir == DDIR_READ)
75 ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
76 else if (io_u->ddir == DDIR_WRITE)
77 ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
79 ret = do_io_u_sync(td, io_u);
81 return fio_io_end(td, io_u, ret);
84 static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
86 struct fio_file *f = io_u->file;
89 fio_ro_check(td, io_u);
91 if (io_u->ddir == DDIR_READ)
92 ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
93 else if (io_u->ddir == DDIR_WRITE)
94 ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
96 ret = do_io_u_sync(td, io_u);
98 return fio_io_end(td, io_u, ret);
101 static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
103 struct timespec fio_unused *t)
105 struct syncio_data *sd = td->io_ops->data;
114 dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
118 static struct io_u *fio_vsyncio_event(struct thread_data *td, int event)
120 struct syncio_data *sd = td->io_ops->data;
122 return sd->io_us[event];
125 static int fio_vsyncio_append(struct thread_data *td, struct io_u *io_u)
127 struct syncio_data *sd = td->io_ops->data;
129 if (ddir_sync(io_u->ddir))
132 if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
133 io_u->ddir == sd->last_ddir)
139 static void fio_vsyncio_set_iov(struct syncio_data *sd, struct io_u *io_u,
142 sd->io_us[index] = io_u;
143 sd->iovecs[index].iov_base = io_u->xfer_buf;
144 sd->iovecs[index].iov_len = io_u->xfer_buflen;
145 sd->last_offset = io_u->offset + io_u->xfer_buflen;
146 sd->last_file = io_u->file;
147 sd->last_ddir = io_u->ddir;
148 sd->queued_bytes += io_u->xfer_buflen;
152 static int fio_vsyncio_queue(struct thread_data *td, struct io_u *io_u)
154 struct syncio_data *sd = td->io_ops->data;
156 fio_ro_check(td, io_u);
158 if (!fio_vsyncio_append(td, io_u)) {
159 dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
161 * If we can't append and have stuff queued, tell fio to
162 * commit those first and then retry this io
166 if (ddir_sync(io_u->ddir)) {
167 int ret = do_io_u_sync(td, io_u);
169 return fio_io_end(td, io_u, ret);
173 sd->queued_bytes = 0;
174 fio_vsyncio_set_iov(sd, io_u, 0);
176 if (sd->queued == td->o.iodepth) {
177 dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
181 dprint(FD_IO, "vsyncio_queue: append\n");
182 fio_vsyncio_set_iov(sd, io_u, sd->queued);
185 dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
190 * Check that we transferred all bytes, or saw an error, etc
192 static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
194 struct syncio_data *sd = td->io_ops->data;
200 * transferred everything, perfect
202 if (bytes == sd->queued_bytes)
206 for (i = 0; i < sd->queued; i++) {
212 unsigned int this_io;
215 if (this_io > io_u->xfer_buflen)
216 this_io = io_u->xfer_buflen;
218 io_u->resid = io_u->xfer_buflen - this_io;
225 td_verror(td, err, "xfer vsync");
232 static int fio_vsyncio_commit(struct thread_data *td)
234 struct syncio_data *sd = td->io_ops->data;
241 io_u_mark_submit(td, sd->queued);
244 if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
247 td_verror(td, errno, "lseek");
251 if (sd->last_ddir == DDIR_READ)
252 ret = readv(f->fd, sd->iovecs, sd->queued);
254 ret = writev(f->fd, sd->iovecs, sd->queued);
256 dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
257 sd->events = sd->queued;
259 return fio_vsyncio_end(td, ret);
262 static int fio_vsyncio_init(struct thread_data *td)
264 struct syncio_data *sd;
266 sd = malloc(sizeof(*sd));
267 memset(sd, 0, sizeof(*sd));
268 sd->last_offset = -1ULL;
269 sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
270 sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
272 td->io_ops->data = sd;
276 static void fio_vsyncio_cleanup(struct thread_data *td)
278 struct syncio_data *sd = td->io_ops->data;
285 static struct ioengine_ops ioengine_rw = {
287 .version = FIO_IOOPS_VERSION,
288 .prep = fio_syncio_prep,
289 .queue = fio_syncio_queue,
290 .open_file = generic_open_file,
291 .close_file = generic_close_file,
292 .get_file_size = generic_get_file_size,
296 static struct ioengine_ops ioengine_prw = {
298 .version = FIO_IOOPS_VERSION,
299 .queue = fio_psyncio_queue,
300 .open_file = generic_open_file,
301 .close_file = generic_close_file,
302 .get_file_size = generic_get_file_size,
306 static struct ioengine_ops ioengine_vrw = {
308 .version = FIO_IOOPS_VERSION,
309 .init = fio_vsyncio_init,
310 .cleanup = fio_vsyncio_cleanup,
311 .queue = fio_vsyncio_queue,
312 .commit = fio_vsyncio_commit,
313 .event = fio_vsyncio_event,
314 .getevents = fio_vsyncio_getevents,
315 .open_file = generic_open_file,
316 .close_file = generic_close_file,
317 .get_file_size = generic_get_file_size,
321 static void fio_init fio_syncio_register(void)
323 register_ioengine(&ioengine_rw);
324 register_ioengine(&ioengine_prw);
325 register_ioengine(&ioengine_vrw);
328 static void fio_exit fio_syncio_unregister(void)
330 unregister_ioengine(&ioengine_rw);
331 unregister_ioengine(&ioengine_prw);
332 unregister_ioengine(&ioengine_vrw);