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.
20 unsigned long queued_bytes;
22 unsigned long long last_offset;
23 struct fio_file *last_file;
24 enum fio_ddir last_ddir;
27 static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
29 struct fio_file *f = io_u->file;
31 if (io_u->ddir == DDIR_SYNC)
33 if (io_u->offset == f->last_completed_pos)
36 if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
37 td_verror(td, errno, "lseek");
44 static int fio_io_end(struct thread_data *td, struct io_u *io_u, int ret)
46 if (ret != (int) io_u->xfer_buflen) {
48 io_u->resid = io_u->xfer_buflen - ret;
50 return FIO_Q_COMPLETED;
56 td_verror(td, io_u->error, "xfer");
58 return FIO_Q_COMPLETED;
61 static int fio_psyncio_queue(struct thread_data *td, struct io_u *io_u)
63 struct fio_file *f = io_u->file;
66 fio_ro_check(td, io_u);
68 if (io_u->ddir == DDIR_READ)
69 ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
70 else if (io_u->ddir == DDIR_WRITE)
71 ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
75 return fio_io_end(td, io_u, ret);
78 static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
80 struct fio_file *f = io_u->file;
83 fio_ro_check(td, io_u);
85 if (io_u->ddir == DDIR_READ)
86 ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
87 else if (io_u->ddir == DDIR_WRITE)
88 ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
92 return fio_io_end(td, io_u, ret);
95 static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
97 struct timespec fio_unused *t)
99 struct syncio_data *sd = td->io_ops->data;
108 dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
112 static struct io_u *fio_vsyncio_event(struct thread_data *td, int event)
114 struct syncio_data *sd = td->io_ops->data;
116 return sd->io_us[event];
119 static int fio_vsyncio_append(struct thread_data *td, struct io_u *io_u)
121 struct syncio_data *sd = td->io_ops->data;
123 if (io_u->ddir == DDIR_SYNC)
126 if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
127 io_u->ddir == sd->last_ddir)
133 static void fio_vsyncio_set_iov(struct syncio_data *sd, struct io_u *io_u,
136 sd->io_us[index] = io_u;
137 sd->iovecs[index].iov_base = io_u->xfer_buf;
138 sd->iovecs[index].iov_len = io_u->xfer_buflen;
139 sd->last_offset = io_u->offset + io_u->xfer_buflen;
140 sd->last_file = io_u->file;
141 sd->last_ddir = io_u->ddir;
142 sd->queued_bytes += io_u->xfer_buflen;
146 static int fio_vsyncio_queue(struct thread_data *td, struct io_u *io_u)
148 struct syncio_data *sd = td->io_ops->data;
150 fio_ro_check(td, io_u);
152 if (!fio_vsyncio_append(td, io_u)) {
153 dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
155 * If we can't append and have stuff queued, tell fio to
156 * commit those first and then retry this io
162 sd->queued_bytes = 0;
163 fio_vsyncio_set_iov(sd, io_u, 0);
165 if (sd->queued == td->o.iodepth) {
166 dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
170 dprint(FD_IO, "vsyncio_queue: append\n");
171 fio_vsyncio_set_iov(sd, io_u, sd->queued);
174 dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
179 * Check that we transferred all bytes, or saw an error, etc
181 static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
183 struct syncio_data *sd = td->io_ops->data;
189 * transferred everything, perfect
191 if (bytes == sd->queued_bytes)
195 for (i = 0; i < sd->queued; i++) {
201 unsigned int this_io;
204 if (this_io > io_u->xfer_buflen)
205 this_io = io_u->xfer_buflen;
207 io_u->resid = io_u->xfer_buflen - this_io;
214 td_verror(td, err, "xfer vsync");
221 static int fio_vsyncio_commit(struct thread_data *td)
223 struct syncio_data *sd = td->io_ops->data;
232 if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
235 td_verror(td, errno, "lseek");
239 if (sd->last_ddir == DDIR_READ)
240 ret = readv(f->fd, sd->iovecs, sd->queued);
242 ret = writev(f->fd, sd->iovecs, sd->queued);
244 dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
245 return fio_vsyncio_end(td, ret);
248 static int fio_vsyncio_init(struct thread_data *td)
250 struct syncio_data *sd;
252 sd = malloc(sizeof(*sd));
253 memset(sd, 0, sizeof(*sd));
254 sd->last_offset = -1ULL;
255 sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
256 sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
258 td->io_ops->data = sd;
262 static void fio_vsyncio_cleanup(struct thread_data *td)
264 struct syncio_data *sd = td->io_ops->data;
269 td->io_ops->data = NULL;
272 static struct ioengine_ops ioengine_rw = {
274 .version = FIO_IOOPS_VERSION,
275 .prep = fio_syncio_prep,
276 .queue = fio_syncio_queue,
277 .open_file = generic_open_file,
278 .close_file = generic_close_file,
282 static struct ioengine_ops ioengine_prw = {
284 .version = FIO_IOOPS_VERSION,
285 .queue = fio_psyncio_queue,
286 .open_file = generic_open_file,
287 .close_file = generic_close_file,
291 static struct ioengine_ops ioengine_vrw = {
293 .version = FIO_IOOPS_VERSION,
294 .init = fio_vsyncio_init,
295 .cleanup = fio_vsyncio_cleanup,
296 .queue = fio_vsyncio_queue,
297 .commit = fio_vsyncio_commit,
298 .event = fio_vsyncio_event,
299 .getevents = fio_vsyncio_getevents,
300 .open_file = generic_open_file,
301 .close_file = generic_close_file,
305 static void fio_init fio_syncio_register(void)
307 register_ioengine(&ioengine_rw);
308 register_ioengine(&ioengine_prw);
309 register_ioengine(&ioengine_vrw);
312 static void fio_exit fio_syncio_unregister(void)
314 unregister_ioengine(&ioengine_rw);
315 unregister_ioengine(&ioengine_prw);
316 unregister_ioengine(&ioengine_vrw);