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);
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);
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 (io_u->ddir == DDIR_SYNC) {
167 int ret = fsync(io_u->file->fd);
169 return fio_io_end(td, io_u, ret);
170 } else if (io_u->ddir == DDIR_DATASYNC) {
172 #ifdef FIO_HAVE_FDATASYNC
173 ret = fdatasync(io_u->file->fd);
175 ret = io_u->xfer_buflen;
176 io_u->error = EINVAL;
178 return fio_io_end(td, io_u, ret);
183 sd->queued_bytes = 0;
184 fio_vsyncio_set_iov(sd, io_u, 0);
186 if (sd->queued == td->o.iodepth) {
187 dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
191 dprint(FD_IO, "vsyncio_queue: append\n");
192 fio_vsyncio_set_iov(sd, io_u, sd->queued);
195 dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
200 * Check that we transferred all bytes, or saw an error, etc
202 static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
204 struct syncio_data *sd = td->io_ops->data;
210 * transferred everything, perfect
212 if (bytes == sd->queued_bytes)
216 for (i = 0; i < sd->queued; i++) {
222 unsigned int this_io;
225 if (this_io > io_u->xfer_buflen)
226 this_io = io_u->xfer_buflen;
228 io_u->resid = io_u->xfer_buflen - this_io;
235 td_verror(td, err, "xfer vsync");
242 static int fio_vsyncio_commit(struct thread_data *td)
244 struct syncio_data *sd = td->io_ops->data;
251 io_u_mark_submit(td, sd->queued);
254 if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
257 td_verror(td, errno, "lseek");
261 if (sd->last_ddir == DDIR_READ)
262 ret = readv(f->fd, sd->iovecs, sd->queued);
264 ret = writev(f->fd, sd->iovecs, sd->queued);
266 dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
267 sd->events = sd->queued;
269 return fio_vsyncio_end(td, ret);
272 static int fio_vsyncio_init(struct thread_data *td)
274 struct syncio_data *sd;
276 sd = malloc(sizeof(*sd));
277 memset(sd, 0, sizeof(*sd));
278 sd->last_offset = -1ULL;
279 sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
280 sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
282 td->io_ops->data = sd;
286 static void fio_vsyncio_cleanup(struct thread_data *td)
288 struct syncio_data *sd = td->io_ops->data;
295 static struct ioengine_ops ioengine_rw = {
297 .version = FIO_IOOPS_VERSION,
298 .prep = fio_syncio_prep,
299 .queue = fio_syncio_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_prw = {
308 .version = FIO_IOOPS_VERSION,
309 .queue = fio_psyncio_queue,
310 .open_file = generic_open_file,
311 .close_file = generic_close_file,
312 .get_file_size = generic_get_file_size,
316 static struct ioengine_ops ioengine_vrw = {
318 .version = FIO_IOOPS_VERSION,
319 .init = fio_vsyncio_init,
320 .cleanup = fio_vsyncio_cleanup,
321 .queue = fio_vsyncio_queue,
322 .commit = fio_vsyncio_commit,
323 .event = fio_vsyncio_event,
324 .getevents = fio_vsyncio_getevents,
325 .open_file = generic_open_file,
326 .close_file = generic_close_file,
327 .get_file_size = generic_get_file_size,
331 static void fio_init fio_syncio_register(void)
333 register_ioengine(&ioengine_rw);
334 register_ioengine(&ioengine_prw);
335 register_ioengine(&ioengine_vrw);
338 static void fio_exit fio_syncio_unregister(void)
340 unregister_ioengine(&ioengine_rw);
341 unregister_ioengine(&ioengine_prw);
342 unregister_ioengine(&ioengine_vrw);