root / posix-aio-compat.c @ 9bf0960a
History | View | Annotate | Download (15.9 kB)
1 |
/*
|
---|---|
2 |
* QEMU posix-aio emulation
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2008
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
8 |
*
|
9 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
10 |
* the COPYING file in the top-level directory.
|
11 |
*
|
12 |
*/
|
13 |
|
14 |
#include <sys/ioctl.h> |
15 |
#include <sys/types.h> |
16 |
#include <pthread.h> |
17 |
#include <unistd.h> |
18 |
#include <errno.h> |
19 |
#include <time.h> |
20 |
#include <string.h> |
21 |
#include <stdlib.h> |
22 |
#include <stdio.h> |
23 |
|
24 |
#include "qemu-queue.h" |
25 |
#include "osdep.h" |
26 |
#include "sysemu.h" |
27 |
#include "qemu-common.h" |
28 |
#include "trace.h" |
29 |
#include "block_int.h" |
30 |
|
31 |
#include "block/raw-posix-aio.h" |
32 |
|
33 |
|
34 |
struct qemu_paiocb {
|
35 |
BlockDriverAIOCB common; |
36 |
int aio_fildes;
|
37 |
union {
|
38 |
struct iovec *aio_iov;
|
39 |
void *aio_ioctl_buf;
|
40 |
}; |
41 |
int aio_niov;
|
42 |
size_t aio_nbytes; |
43 |
#define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */ |
44 |
int ev_signo;
|
45 |
off_t aio_offset; |
46 |
|
47 |
QTAILQ_ENTRY(qemu_paiocb) node; |
48 |
int aio_type;
|
49 |
ssize_t ret; |
50 |
int active;
|
51 |
struct qemu_paiocb *next;
|
52 |
|
53 |
int async_context_id;
|
54 |
}; |
55 |
|
56 |
typedef struct PosixAioState { |
57 |
int rfd, wfd;
|
58 |
struct qemu_paiocb *first_aio;
|
59 |
} PosixAioState; |
60 |
|
61 |
|
62 |
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
|
63 |
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
|
64 |
static pthread_t thread_id;
|
65 |
static pthread_attr_t attr;
|
66 |
static int max_threads = 64; |
67 |
static int cur_threads = 0; |
68 |
static int idle_threads = 0; |
69 |
static QTAILQ_HEAD(, qemu_paiocb) request_list;
|
70 |
|
71 |
#ifdef CONFIG_PREADV
|
72 |
static int preadv_present = 1; |
73 |
#else
|
74 |
static int preadv_present = 0; |
75 |
#endif
|
76 |
|
77 |
static void die2(int err, const char *what) |
78 |
{ |
79 |
fprintf(stderr, "%s failed: %s\n", what, strerror(err));
|
80 |
abort(); |
81 |
} |
82 |
|
83 |
static void die(const char *what) |
84 |
{ |
85 |
die2(errno, what); |
86 |
} |
87 |
|
88 |
static void mutex_lock(pthread_mutex_t *mutex) |
89 |
{ |
90 |
int ret = pthread_mutex_lock(mutex);
|
91 |
if (ret) die2(ret, "pthread_mutex_lock"); |
92 |
} |
93 |
|
94 |
static void mutex_unlock(pthread_mutex_t *mutex) |
95 |
{ |
96 |
int ret = pthread_mutex_unlock(mutex);
|
97 |
if (ret) die2(ret, "pthread_mutex_unlock"); |
98 |
} |
99 |
|
100 |
static int cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, |
101 |
struct timespec *ts)
|
102 |
{ |
103 |
int ret = pthread_cond_timedwait(cond, mutex, ts);
|
104 |
if (ret && ret != ETIMEDOUT) die2(ret, "pthread_cond_timedwait"); |
105 |
return ret;
|
106 |
} |
107 |
|
108 |
static void cond_signal(pthread_cond_t *cond) |
109 |
{ |
110 |
int ret = pthread_cond_signal(cond);
|
111 |
if (ret) die2(ret, "pthread_cond_signal"); |
112 |
} |
113 |
|
114 |
static void thread_create(pthread_t *thread, pthread_attr_t *attr, |
115 |
void *(*start_routine)(void*), void *arg) |
116 |
{ |
117 |
int ret = pthread_create(thread, attr, start_routine, arg);
|
118 |
if (ret) die2(ret, "pthread_create"); |
119 |
} |
120 |
|
121 |
static ssize_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb) |
122 |
{ |
123 |
int ret;
|
124 |
|
125 |
ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf); |
126 |
if (ret == -1) |
127 |
return -errno;
|
128 |
|
129 |
/*
|
130 |
* This looks weird, but the aio code only consideres a request
|
131 |
* successful if it has written the number full number of bytes.
|
132 |
*
|
133 |
* Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
|
134 |
* so in fact we return the ioctl command here to make posix_aio_read()
|
135 |
* happy..
|
136 |
*/
|
137 |
return aiocb->aio_nbytes;
|
138 |
} |
139 |
|
140 |
static ssize_t handle_aiocb_flush(struct qemu_paiocb *aiocb) |
141 |
{ |
142 |
int ret;
|
143 |
|
144 |
ret = qemu_fdatasync(aiocb->aio_fildes); |
145 |
if (ret == -1) |
146 |
return -errno;
|
147 |
return 0; |
148 |
} |
149 |
|
150 |
#ifdef CONFIG_PREADV
|
151 |
|
152 |
static ssize_t
|
153 |
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
154 |
{ |
155 |
return preadv(fd, iov, nr_iov, offset);
|
156 |
} |
157 |
|
158 |
static ssize_t
|
159 |
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
160 |
{ |
161 |
return pwritev(fd, iov, nr_iov, offset);
|
162 |
} |
163 |
|
164 |
#else
|
165 |
|
166 |
static ssize_t
|
167 |
qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
168 |
{ |
169 |
return -ENOSYS;
|
170 |
} |
171 |
|
172 |
static ssize_t
|
173 |
qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
174 |
{ |
175 |
return -ENOSYS;
|
176 |
} |
177 |
|
178 |
#endif
|
179 |
|
180 |
static ssize_t handle_aiocb_rw_vector(struct qemu_paiocb *aiocb) |
181 |
{ |
182 |
size_t offset = 0;
|
183 |
ssize_t len; |
184 |
|
185 |
do {
|
186 |
if (aiocb->aio_type & QEMU_AIO_WRITE)
|
187 |
len = qemu_pwritev(aiocb->aio_fildes, |
188 |
aiocb->aio_iov, |
189 |
aiocb->aio_niov, |
190 |
aiocb->aio_offset + offset); |
191 |
else
|
192 |
len = qemu_preadv(aiocb->aio_fildes, |
193 |
aiocb->aio_iov, |
194 |
aiocb->aio_niov, |
195 |
aiocb->aio_offset + offset); |
196 |
} while (len == -1 && errno == EINTR); |
197 |
|
198 |
if (len == -1) |
199 |
return -errno;
|
200 |
return len;
|
201 |
} |
202 |
|
203 |
static ssize_t handle_aiocb_rw_linear(struct qemu_paiocb *aiocb, char *buf) |
204 |
{ |
205 |
ssize_t offset = 0;
|
206 |
ssize_t len; |
207 |
|
208 |
while (offset < aiocb->aio_nbytes) {
|
209 |
if (aiocb->aio_type & QEMU_AIO_WRITE)
|
210 |
len = pwrite(aiocb->aio_fildes, |
211 |
(const char *)buf + offset, |
212 |
aiocb->aio_nbytes - offset, |
213 |
aiocb->aio_offset + offset); |
214 |
else
|
215 |
len = pread(aiocb->aio_fildes, |
216 |
buf + offset, |
217 |
aiocb->aio_nbytes - offset, |
218 |
aiocb->aio_offset + offset); |
219 |
|
220 |
if (len == -1 && errno == EINTR) |
221 |
continue;
|
222 |
else if (len == -1) { |
223 |
offset = -errno; |
224 |
break;
|
225 |
} else if (len == 0) |
226 |
break;
|
227 |
|
228 |
offset += len; |
229 |
} |
230 |
|
231 |
return offset;
|
232 |
} |
233 |
|
234 |
static ssize_t handle_aiocb_rw(struct qemu_paiocb *aiocb) |
235 |
{ |
236 |
ssize_t nbytes; |
237 |
char *buf;
|
238 |
|
239 |
if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
|
240 |
/*
|
241 |
* If there is just a single buffer, and it is properly aligned
|
242 |
* we can just use plain pread/pwrite without any problems.
|
243 |
*/
|
244 |
if (aiocb->aio_niov == 1) |
245 |
return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
|
246 |
|
247 |
/*
|
248 |
* We have more than one iovec, and all are properly aligned.
|
249 |
*
|
250 |
* Try preadv/pwritev first and fall back to linearizing the
|
251 |
* buffer if it's not supported.
|
252 |
*/
|
253 |
if (preadv_present) {
|
254 |
nbytes = handle_aiocb_rw_vector(aiocb); |
255 |
if (nbytes == aiocb->aio_nbytes)
|
256 |
return nbytes;
|
257 |
if (nbytes < 0 && nbytes != -ENOSYS) |
258 |
return nbytes;
|
259 |
preadv_present = 0;
|
260 |
} |
261 |
|
262 |
/*
|
263 |
* XXX(hch): short read/write. no easy way to handle the reminder
|
264 |
* using these interfaces. For now retry using plain
|
265 |
* pread/pwrite?
|
266 |
*/
|
267 |
} |
268 |
|
269 |
/*
|
270 |
* Ok, we have to do it the hard way, copy all segments into
|
271 |
* a single aligned buffer.
|
272 |
*/
|
273 |
buf = qemu_blockalign(aiocb->common.bs, aiocb->aio_nbytes); |
274 |
if (aiocb->aio_type & QEMU_AIO_WRITE) {
|
275 |
char *p = buf;
|
276 |
int i;
|
277 |
|
278 |
for (i = 0; i < aiocb->aio_niov; ++i) { |
279 |
memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len); |
280 |
p += aiocb->aio_iov[i].iov_len; |
281 |
} |
282 |
} |
283 |
|
284 |
nbytes = handle_aiocb_rw_linear(aiocb, buf); |
285 |
if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
|
286 |
char *p = buf;
|
287 |
size_t count = aiocb->aio_nbytes, copy; |
288 |
int i;
|
289 |
|
290 |
for (i = 0; i < aiocb->aio_niov && count; ++i) { |
291 |
copy = count; |
292 |
if (copy > aiocb->aio_iov[i].iov_len)
|
293 |
copy = aiocb->aio_iov[i].iov_len; |
294 |
memcpy(aiocb->aio_iov[i].iov_base, p, copy); |
295 |
p += copy; |
296 |
count -= copy; |
297 |
} |
298 |
} |
299 |
qemu_vfree(buf); |
300 |
|
301 |
return nbytes;
|
302 |
} |
303 |
|
304 |
static void *aio_thread(void *unused) |
305 |
{ |
306 |
pid_t pid; |
307 |
|
308 |
pid = getpid(); |
309 |
|
310 |
while (1) { |
311 |
struct qemu_paiocb *aiocb;
|
312 |
ssize_t ret = 0;
|
313 |
qemu_timeval tv; |
314 |
struct timespec ts;
|
315 |
|
316 |
qemu_gettimeofday(&tv); |
317 |
ts.tv_sec = tv.tv_sec + 10;
|
318 |
ts.tv_nsec = 0;
|
319 |
|
320 |
mutex_lock(&lock); |
321 |
|
322 |
while (QTAILQ_EMPTY(&request_list) &&
|
323 |
!(ret == ETIMEDOUT)) { |
324 |
idle_threads++; |
325 |
ret = cond_timedwait(&cond, &lock, &ts); |
326 |
idle_threads--; |
327 |
} |
328 |
|
329 |
if (QTAILQ_EMPTY(&request_list))
|
330 |
break;
|
331 |
|
332 |
aiocb = QTAILQ_FIRST(&request_list); |
333 |
QTAILQ_REMOVE(&request_list, aiocb, node); |
334 |
aiocb->active = 1;
|
335 |
mutex_unlock(&lock); |
336 |
|
337 |
switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
|
338 |
case QEMU_AIO_READ:
|
339 |
case QEMU_AIO_WRITE:
|
340 |
ret = handle_aiocb_rw(aiocb); |
341 |
break;
|
342 |
case QEMU_AIO_FLUSH:
|
343 |
ret = handle_aiocb_flush(aiocb); |
344 |
break;
|
345 |
case QEMU_AIO_IOCTL:
|
346 |
ret = handle_aiocb_ioctl(aiocb); |
347 |
break;
|
348 |
default:
|
349 |
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
|
350 |
ret = -EINVAL; |
351 |
break;
|
352 |
} |
353 |
|
354 |
mutex_lock(&lock); |
355 |
aiocb->ret = ret; |
356 |
mutex_unlock(&lock); |
357 |
|
358 |
if (kill(pid, aiocb->ev_signo)) die("kill failed"); |
359 |
} |
360 |
|
361 |
cur_threads--; |
362 |
mutex_unlock(&lock); |
363 |
|
364 |
return NULL; |
365 |
} |
366 |
|
367 |
static void spawn_thread(void) |
368 |
{ |
369 |
sigset_t set, oldset; |
370 |
|
371 |
cur_threads++; |
372 |
|
373 |
/* block all signals */
|
374 |
if (sigfillset(&set)) die("sigfillset"); |
375 |
if (sigprocmask(SIG_SETMASK, &set, &oldset)) die("sigprocmask"); |
376 |
|
377 |
thread_create(&thread_id, &attr, aio_thread, NULL);
|
378 |
|
379 |
if (sigprocmask(SIG_SETMASK, &oldset, NULL)) die("sigprocmask restore"); |
380 |
} |
381 |
|
382 |
static void qemu_paio_submit(struct qemu_paiocb *aiocb) |
383 |
{ |
384 |
aiocb->ret = -EINPROGRESS; |
385 |
aiocb->active = 0;
|
386 |
mutex_lock(&lock); |
387 |
if (idle_threads == 0 && cur_threads < max_threads) |
388 |
spawn_thread(); |
389 |
QTAILQ_INSERT_TAIL(&request_list, aiocb, node); |
390 |
mutex_unlock(&lock); |
391 |
cond_signal(&cond); |
392 |
} |
393 |
|
394 |
static ssize_t qemu_paio_return(struct qemu_paiocb *aiocb) |
395 |
{ |
396 |
ssize_t ret; |
397 |
|
398 |
mutex_lock(&lock); |
399 |
ret = aiocb->ret; |
400 |
mutex_unlock(&lock); |
401 |
|
402 |
return ret;
|
403 |
} |
404 |
|
405 |
static int qemu_paio_error(struct qemu_paiocb *aiocb) |
406 |
{ |
407 |
ssize_t ret = qemu_paio_return(aiocb); |
408 |
|
409 |
if (ret < 0) |
410 |
ret = -ret; |
411 |
else
|
412 |
ret = 0;
|
413 |
|
414 |
return ret;
|
415 |
} |
416 |
|
417 |
static int posix_aio_process_queue(void *opaque) |
418 |
{ |
419 |
PosixAioState *s = opaque; |
420 |
struct qemu_paiocb *acb, **pacb;
|
421 |
int ret;
|
422 |
int result = 0; |
423 |
int async_context_id = get_async_context_id();
|
424 |
|
425 |
for(;;) {
|
426 |
pacb = &s->first_aio; |
427 |
for(;;) {
|
428 |
acb = *pacb; |
429 |
if (!acb)
|
430 |
return result;
|
431 |
|
432 |
/* we're only interested in requests in the right context */
|
433 |
if (acb->async_context_id != async_context_id) {
|
434 |
pacb = &acb->next; |
435 |
continue;
|
436 |
} |
437 |
|
438 |
ret = qemu_paio_error(acb); |
439 |
if (ret == ECANCELED) {
|
440 |
/* remove the request */
|
441 |
*pacb = acb->next; |
442 |
qemu_aio_release(acb); |
443 |
result = 1;
|
444 |
} else if (ret != EINPROGRESS) { |
445 |
/* end of aio */
|
446 |
if (ret == 0) { |
447 |
ret = qemu_paio_return(acb); |
448 |
if (ret == acb->aio_nbytes)
|
449 |
ret = 0;
|
450 |
else
|
451 |
ret = -EINVAL; |
452 |
} else {
|
453 |
ret = -ret; |
454 |
} |
455 |
|
456 |
trace_paio_complete(acb, acb->common.opaque, ret); |
457 |
|
458 |
/* remove the request */
|
459 |
*pacb = acb->next; |
460 |
/* call the callback */
|
461 |
acb->common.cb(acb->common.opaque, ret); |
462 |
qemu_aio_release(acb); |
463 |
result = 1;
|
464 |
break;
|
465 |
} else {
|
466 |
pacb = &acb->next; |
467 |
} |
468 |
} |
469 |
} |
470 |
|
471 |
return result;
|
472 |
} |
473 |
|
474 |
static void posix_aio_read(void *opaque) |
475 |
{ |
476 |
PosixAioState *s = opaque; |
477 |
ssize_t len; |
478 |
|
479 |
/* read all bytes from signal pipe */
|
480 |
for (;;) {
|
481 |
char bytes[16]; |
482 |
|
483 |
len = read(s->rfd, bytes, sizeof(bytes));
|
484 |
if (len == -1 && errno == EINTR) |
485 |
continue; /* try again */ |
486 |
if (len == sizeof(bytes)) |
487 |
continue; /* more to read */ |
488 |
break;
|
489 |
} |
490 |
|
491 |
posix_aio_process_queue(s); |
492 |
} |
493 |
|
494 |
static int posix_aio_flush(void *opaque) |
495 |
{ |
496 |
PosixAioState *s = opaque; |
497 |
return !!s->first_aio;
|
498 |
} |
499 |
|
500 |
static PosixAioState *posix_aio_state;
|
501 |
|
502 |
static void aio_signal_handler(int signum) |
503 |
{ |
504 |
if (posix_aio_state) {
|
505 |
char byte = 0; |
506 |
ssize_t ret; |
507 |
|
508 |
ret = write(posix_aio_state->wfd, &byte, sizeof(byte));
|
509 |
if (ret < 0 && errno != EAGAIN) |
510 |
die("write()");
|
511 |
} |
512 |
|
513 |
qemu_service_io(); |
514 |
} |
515 |
|
516 |
static void paio_remove(struct qemu_paiocb *acb) |
517 |
{ |
518 |
struct qemu_paiocb **pacb;
|
519 |
|
520 |
/* remove the callback from the queue */
|
521 |
pacb = &posix_aio_state->first_aio; |
522 |
for(;;) {
|
523 |
if (*pacb == NULL) { |
524 |
fprintf(stderr, "paio_remove: aio request not found!\n");
|
525 |
break;
|
526 |
} else if (*pacb == acb) { |
527 |
*pacb = acb->next; |
528 |
qemu_aio_release(acb); |
529 |
break;
|
530 |
} |
531 |
pacb = &(*pacb)->next; |
532 |
} |
533 |
} |
534 |
|
535 |
static void paio_cancel(BlockDriverAIOCB *blockacb) |
536 |
{ |
537 |
struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb; |
538 |
int active = 0; |
539 |
|
540 |
trace_paio_cancel(acb, acb->common.opaque); |
541 |
|
542 |
mutex_lock(&lock); |
543 |
if (!acb->active) {
|
544 |
QTAILQ_REMOVE(&request_list, acb, node); |
545 |
acb->ret = -ECANCELED; |
546 |
} else if (acb->ret == -EINPROGRESS) { |
547 |
active = 1;
|
548 |
} |
549 |
mutex_unlock(&lock); |
550 |
|
551 |
if (active) {
|
552 |
/* fail safe: if the aio could not be canceled, we wait for
|
553 |
it */
|
554 |
while (qemu_paio_error(acb) == EINPROGRESS)
|
555 |
; |
556 |
} |
557 |
|
558 |
paio_remove(acb); |
559 |
} |
560 |
|
561 |
static AIOPool raw_aio_pool = {
|
562 |
.aiocb_size = sizeof(struct qemu_paiocb), |
563 |
.cancel = paio_cancel, |
564 |
}; |
565 |
|
566 |
BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
|
567 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
568 |
BlockDriverCompletionFunc *cb, void *opaque, int type) |
569 |
{ |
570 |
struct qemu_paiocb *acb;
|
571 |
|
572 |
acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); |
573 |
if (!acb)
|
574 |
return NULL; |
575 |
acb->aio_type = type; |
576 |
acb->aio_fildes = fd; |
577 |
acb->ev_signo = SIGUSR2; |
578 |
acb->async_context_id = get_async_context_id(); |
579 |
|
580 |
if (qiov) {
|
581 |
acb->aio_iov = qiov->iov; |
582 |
acb->aio_niov = qiov->niov; |
583 |
} |
584 |
acb->aio_nbytes = nb_sectors * 512;
|
585 |
acb->aio_offset = sector_num * 512;
|
586 |
|
587 |
acb->next = posix_aio_state->first_aio; |
588 |
posix_aio_state->first_aio = acb; |
589 |
|
590 |
trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); |
591 |
qemu_paio_submit(acb); |
592 |
return &acb->common;
|
593 |
} |
594 |
|
595 |
BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
|
596 |
unsigned long int req, void *buf, |
597 |
BlockDriverCompletionFunc *cb, void *opaque)
|
598 |
{ |
599 |
struct qemu_paiocb *acb;
|
600 |
|
601 |
acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); |
602 |
if (!acb)
|
603 |
return NULL; |
604 |
acb->aio_type = QEMU_AIO_IOCTL; |
605 |
acb->aio_fildes = fd; |
606 |
acb->ev_signo = SIGUSR2; |
607 |
acb->async_context_id = get_async_context_id(); |
608 |
acb->aio_offset = 0;
|
609 |
acb->aio_ioctl_buf = buf; |
610 |
acb->aio_ioctl_cmd = req; |
611 |
|
612 |
acb->next = posix_aio_state->first_aio; |
613 |
posix_aio_state->first_aio = acb; |
614 |
|
615 |
qemu_paio_submit(acb); |
616 |
return &acb->common;
|
617 |
} |
618 |
|
619 |
int paio_init(void) |
620 |
{ |
621 |
struct sigaction act;
|
622 |
PosixAioState *s; |
623 |
int fds[2]; |
624 |
int ret;
|
625 |
|
626 |
if (posix_aio_state)
|
627 |
return 0; |
628 |
|
629 |
s = qemu_malloc(sizeof(PosixAioState));
|
630 |
|
631 |
sigfillset(&act.sa_mask); |
632 |
act.sa_flags = 0; /* do not restart syscalls to interrupt select() */ |
633 |
act.sa_handler = aio_signal_handler; |
634 |
sigaction(SIGUSR2, &act, NULL);
|
635 |
|
636 |
s->first_aio = NULL;
|
637 |
if (qemu_pipe(fds) == -1) { |
638 |
fprintf(stderr, "failed to create pipe\n");
|
639 |
return -1; |
640 |
} |
641 |
|
642 |
s->rfd = fds[0];
|
643 |
s->wfd = fds[1];
|
644 |
|
645 |
fcntl(s->rfd, F_SETFL, O_NONBLOCK); |
646 |
fcntl(s->wfd, F_SETFL, O_NONBLOCK); |
647 |
|
648 |
qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush,
|
649 |
posix_aio_process_queue, s); |
650 |
|
651 |
ret = pthread_attr_init(&attr); |
652 |
if (ret)
|
653 |
die2(ret, "pthread_attr_init");
|
654 |
|
655 |
ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
656 |
if (ret)
|
657 |
die2(ret, "pthread_attr_setdetachstate");
|
658 |
|
659 |
QTAILQ_INIT(&request_list); |
660 |
|
661 |
posix_aio_state = s; |
662 |
return 0; |
663 |
} |