1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* Block driver for RAW files (win32)
*
* Copyright (c) 2006 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "qemu/timer.h"
#include "block/block_int.h"
#include "qemu/module.h"
#include "qemu-common.h"
#include "block/aio.h"
#include "raw-aio.h"
#include "qemu/event_notifier.h"
#include <windows.h>
#include <winioctl.h>
#define FTYPE_FILE 0
#define FTYPE_CD 1
#define FTYPE_HARDDISK 2
struct QEMUWin32AIOState {
HANDLE hIOCP;
EventNotifier e;
int count;
};
typedef struct QEMUWin32AIOCB {
BlockDriverAIOCB common;
struct QEMUWin32AIOState *ctx;
int nbytes;
OVERLAPPED ov;
QEMUIOVector *qiov;
void *buf;
bool is_read;
bool is_linear;
} QEMUWin32AIOCB;
/*
* Completes an AIO request (calls the callback and frees the ACB).
*/
static void win32_aio_process_completion(QEMUWin32AIOState *s,
QEMUWin32AIOCB *waiocb, DWORD count)
{
int ret;
s->count--;
if (waiocb->ov.Internal != 0) {
ret = -EIO;
} else {
ret = 0;
if (count < waiocb->nbytes) {
/* Short reads mean EOF, pad with zeros. */
if (waiocb->is_read) {
qemu_iovec_memset(waiocb->qiov, count, 0,
waiocb->qiov->size - count);
} else {
ret = -EINVAL;
}
}
}
if (!waiocb->is_linear) {
if (ret == 0 && waiocb->is_read) {
QEMUIOVector *qiov = waiocb->qiov;
char *p = waiocb->buf;
int i;
for (i = 0; i < qiov->niov; ++i) {
memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
p += qiov->iov[i].iov_len;
}
qemu_vfree(waiocb->buf);
}
}
waiocb->common.cb(waiocb->common.opaque, ret);
qemu_aio_release(waiocb);
}
static void win32_aio_completion_cb(EventNotifier *e)
{
QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e);
DWORD count;
ULONG_PTR key;
OVERLAPPED *ov;
event_notifier_test_and_clear(&s->e);
while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) {
QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov);
win32_aio_process_completion(s, waiocb, count);
}
}
static int win32_aio_flush_cb(EventNotifier *e)
{
QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e);
return (s->count > 0) ? 1 : 0;
}
static void win32_aio_cancel(BlockDriverAIOCB *blockacb)
{
QEMUWin32AIOCB *waiocb = (QEMUWin32AIOCB *)blockacb;
/*
* CancelIoEx is only supported in Vista and newer. For now, just
* wait for completion.
*/
while (!HasOverlappedIoCompleted(&waiocb->ov)) {
qemu_aio_wait();
}
}
static const AIOCBInfo win32_aiocb_info = {
.aiocb_size = sizeof(QEMUWin32AIOCB),
.cancel = win32_aio_cancel,
};
BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs,
QEMUWin32AIOState *aio, HANDLE hfile,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb, void *opaque, int type)
{
struct QEMUWin32AIOCB *waiocb;
uint64_t offset = sector_num * 512;
DWORD rc;
waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque);
waiocb->nbytes = nb_sectors * 512;
waiocb->qiov = qiov;
waiocb->is_read = (type == QEMU_AIO_READ);
if (qiov->niov > 1) {
waiocb->buf = qemu_blockalign(bs, qiov->size);
if (type & QEMU_AIO_WRITE) {
char *p = waiocb->buf;
int i;
for (i = 0; i < qiov->niov; ++i) {
memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
p += qiov->iov[i].iov_len;
}
}
waiocb->is_linear = false;
} else {
waiocb->buf = qiov->iov[0].iov_base;
waiocb->is_linear = true;
}
memset(&waiocb->ov, 0, sizeof(waiocb->ov));
waiocb->ov.Offset = (DWORD)offset;
waiocb->ov.OffsetHigh = (DWORD)(offset >> 32);
waiocb->ov.hEvent = event_notifier_get_handle(&aio->e);
aio->count++;
if (type & QEMU_AIO_READ) {
rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
} else {
rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
}
if(rc == 0 && GetLastError() != ERROR_IO_PENDING) {
goto out_dec_count;
}
return &waiocb->common;
out_dec_count:
aio->count--;
qemu_aio_release(waiocb);
return NULL;
}
int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
{
if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) {
return -EINVAL;
} else {
return 0;
}
}
QEMUWin32AIOState *win32_aio_init(void)
{
QEMUWin32AIOState *s;
s = g_malloc0(sizeof(*s));
if (event_notifier_init(&s->e, false) < 0) {
goto out_free_state;
}
s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
if (s->hIOCP == NULL) {
goto out_close_efd;
}
qemu_aio_set_event_notifier(&s->e, win32_aio_completion_cb,
win32_aio_flush_cb);
return s;
out_close_efd:
event_notifier_cleanup(&s->e);
out_free_state:
g_free(s);
return NULL;
}
|
