vsync: Fix issue with double issue of io_u
[fio.git] / engines / sync.c
CommitLineData
2866c82d 1/*
a31041ea 2 * sync/psync engine
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3 *
4 * IO engine that does regular read(2)/write(2) with lseek(2) to transfer
a31041ea 5 * data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
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6 *
7 */
8#include <stdio.h>
9#include <stdlib.h>
10#include <unistd.h>
5921e80c 11#include <sys/uio.h>
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12#include <errno.h>
13#include <assert.h>
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14
15#include "../fio.h"
2866c82d 16
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17struct syncio_data {
18 struct iovec *iovecs;
19 struct io_u **io_us;
20 unsigned int queued;
e51cf72c 21 unsigned int events;
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22 unsigned long queued_bytes;
23
24 unsigned long long last_offset;
25 struct fio_file *last_file;
26 enum fio_ddir last_ddir;
27};
28
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29static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
30{
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31 struct fio_file *f = io_u->file;
32
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33 if (io_u->ddir == DDIR_SYNC)
34 return 0;
35
53cdc686 36 if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
e1161c32 37 td_verror(td, errno, "lseek");
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38 return 1;
39 }
40
41 return 0;
42}
43
2bd3eabc 44static int fio_io_end(struct thread_data *td, struct io_u *io_u, int ret)
2866c82d 45{
cec6b55d 46 if (ret != (int) io_u->xfer_buflen) {
22819ec2 47 if (ret >= 0) {
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48 io_u->resid = io_u->xfer_buflen - ret;
49 io_u->error = 0;
36167d82 50 return FIO_Q_COMPLETED;
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51 } else
52 io_u->error = errno;
53 }
54
36167d82 55 if (io_u->error)
e1161c32 56 td_verror(td, io_u->error, "xfer");
2866c82d 57
36167d82 58 return FIO_Q_COMPLETED;
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59}
60
2bd3eabc 61static int fio_psyncio_queue(struct thread_data *td, struct io_u *io_u)
a31041ea 62{
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63 struct fio_file *f = io_u->file;
64 int ret;
65
66 fio_ro_check(td, io_u);
67
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);
72 else
73 ret = fsync(f->fd);
74
75 return fio_io_end(td, io_u, ret);
76}
77
78static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
79{
80 struct fio_file *f = io_u->file;
81 int ret;
82
83 fio_ro_check(td, io_u);
84
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);
89 else
90 ret = fsync(f->fd);
91
92 return fio_io_end(td, io_u, ret);
a31041ea 93}
94
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95static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
96 unsigned int max,
97 struct timespec fio_unused *t)
98{
99 struct syncio_data *sd = td->io_ops->data;
100 int ret;
101
102 if (min) {
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103 ret = sd->events;
104 sd->events = 0;
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105 } else
106 ret = 0;
107
108 dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
109 return ret;
110}
111
112static struct io_u *fio_vsyncio_event(struct thread_data *td, int event)
113{
114 struct syncio_data *sd = td->io_ops->data;
115
116 return sd->io_us[event];
117}
118
119static int fio_vsyncio_append(struct thread_data *td, struct io_u *io_u)
120{
121 struct syncio_data *sd = td->io_ops->data;
122
123 if (io_u->ddir == DDIR_SYNC)
124 return 0;
125
126 if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
127 io_u->ddir == sd->last_ddir)
128 return 1;
129
130 return 0;
131}
132
133static void fio_vsyncio_set_iov(struct syncio_data *sd, struct io_u *io_u,
134 int index)
135{
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;
143 sd->queued++;
144}
145
146static int fio_vsyncio_queue(struct thread_data *td, struct io_u *io_u)
147{
148 struct syncio_data *sd = td->io_ops->data;
149
150 fio_ro_check(td, io_u);
151
152 if (!fio_vsyncio_append(td, io_u)) {
153 dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
154 /*
155 * If we can't append and have stuff queued, tell fio to
156 * commit those first and then retry this io
157 */
158 if (sd->queued)
159 return FIO_Q_BUSY;
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160 if (io_u->ddir == DDIR_SYNC) {
161 int ret = fsync(io_u->file->fd);
162
163 return fio_io_end(td, io_u, ret);
164 }
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165
166 sd->queued = 0;
167 sd->queued_bytes = 0;
168 fio_vsyncio_set_iov(sd, io_u, 0);
169 } else {
170 if (sd->queued == td->o.iodepth) {
171 dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
172 return FIO_Q_BUSY;
173 }
174
175 dprint(FD_IO, "vsyncio_queue: append\n");
176 fio_vsyncio_set_iov(sd, io_u, sd->queued);
177 }
178
179 dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
180 return FIO_Q_QUEUED;
181}
182
183/*
184 * Check that we transferred all bytes, or saw an error, etc
185 */
186static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
187{
188 struct syncio_data *sd = td->io_ops->data;
189 struct io_u *io_u;
190 unsigned int i;
191 int err;
192
193 /*
194 * transferred everything, perfect
195 */
196 if (bytes == sd->queued_bytes)
197 return 0;
198
199 err = errno;
200 for (i = 0; i < sd->queued; i++) {
201 io_u = sd->io_us[i];
202
203 if (bytes == -1) {
204 io_u->error = err;
205 } else {
206 unsigned int this_io;
207
208 this_io = bytes;
209 if (this_io > io_u->xfer_buflen)
210 this_io = io_u->xfer_buflen;
211
212 io_u->resid = io_u->xfer_buflen - this_io;
213 io_u->error = 0;
214 bytes -= this_io;
215 }
216 }
217
218 if (bytes == -1) {
219 td_verror(td, err, "xfer vsync");
220 return -err;
221 }
222
223 return 0;
224}
225
226static int fio_vsyncio_commit(struct thread_data *td)
227{
228 struct syncio_data *sd = td->io_ops->data;
229 struct fio_file *f;
230 ssize_t ret;
231
232 if (!sd->queued)
233 return 0;
234
838bc709 235 io_u_mark_submit(td, sd->queued);
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236 f = sd->last_file;
237
238 if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
239 int err = -errno;
240
241 td_verror(td, errno, "lseek");
242 return err;
243 }
244
245 if (sd->last_ddir == DDIR_READ)
246 ret = readv(f->fd, sd->iovecs, sd->queued);
247 else
248 ret = writev(f->fd, sd->iovecs, sd->queued);
249
250 dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
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251 sd->events = sd->queued;
252 sd->queued = 0;
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253 return fio_vsyncio_end(td, ret);
254}
255
256static int fio_vsyncio_init(struct thread_data *td)
257{
258 struct syncio_data *sd;
259
260 sd = malloc(sizeof(*sd));
261 memset(sd, 0, sizeof(*sd));
262 sd->last_offset = -1ULL;
263 sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
264 sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
265
266 td->io_ops->data = sd;
267 return 0;
268}
269
270static void fio_vsyncio_cleanup(struct thread_data *td)
271{
272 struct syncio_data *sd = td->io_ops->data;
273
274 free(sd->iovecs);
275 free(sd->io_us);
276 free(sd);
277 td->io_ops->data = NULL;
278}
279
a31041ea 280static struct ioengine_ops ioengine_rw = {
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281 .name = "sync",
282 .version = FIO_IOOPS_VERSION,
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283 .prep = fio_syncio_prep,
284 .queue = fio_syncio_queue,
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285 .open_file = generic_open_file,
286 .close_file = generic_close_file,
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287 .flags = FIO_SYNCIO,
288};
5f350952 289
a31041ea 290static struct ioengine_ops ioengine_prw = {
291 .name = "psync",
292 .version = FIO_IOOPS_VERSION,
2bd3eabc 293 .queue = fio_psyncio_queue,
a31041ea 294 .open_file = generic_open_file,
295 .close_file = generic_close_file,
296 .flags = FIO_SYNCIO,
297};
298
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299static struct ioengine_ops ioengine_vrw = {
300 .name = "vsync",
301 .version = FIO_IOOPS_VERSION,
302 .init = fio_vsyncio_init,
303 .cleanup = fio_vsyncio_cleanup,
304 .queue = fio_vsyncio_queue,
305 .commit = fio_vsyncio_commit,
306 .event = fio_vsyncio_event,
307 .getevents = fio_vsyncio_getevents,
308 .open_file = generic_open_file,
309 .close_file = generic_close_file,
310 .flags = FIO_SYNCIO,
311};
312
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313static void fio_init fio_syncio_register(void)
314{
a31041ea 315 register_ioengine(&ioengine_rw);
316 register_ioengine(&ioengine_prw);
1d2af02a 317 register_ioengine(&ioengine_vrw);
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318}
319
320static void fio_exit fio_syncio_unregister(void)
321{
a31041ea 322 unregister_ioengine(&ioengine_rw);
323 unregister_ioengine(&ioengine_prw);
1d2af02a 324 unregister_ioengine(&ioengine_vrw);
5f350952 325}