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a2736526 PB |
1 | /* |
2 | * Block driver for RAW files (win32) | |
3 | * | |
4 | * Copyright (c) 2006 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include "qemu-common.h" | |
25 | #include "qemu-timer.h" | |
26 | #include "block_int.h" | |
27 | #include "module.h" | |
28 | #include "qemu-common.h" | |
29 | #include "qemu-aio.h" | |
30 | #include "raw-aio.h" | |
31 | #include "event_notifier.h" | |
32 | #include <windows.h> | |
33 | #include <winioctl.h> | |
34 | ||
35 | #define FTYPE_FILE 0 | |
36 | #define FTYPE_CD 1 | |
37 | #define FTYPE_HARDDISK 2 | |
38 | ||
39 | struct QEMUWin32AIOState { | |
40 | HANDLE hIOCP; | |
41 | EventNotifier e; | |
42 | int count; | |
43 | }; | |
44 | ||
45 | typedef struct QEMUWin32AIOCB { | |
46 | BlockDriverAIOCB common; | |
47 | struct QEMUWin32AIOState *ctx; | |
48 | int nbytes; | |
49 | OVERLAPPED ov; | |
50 | QEMUIOVector *qiov; | |
51 | void *buf; | |
52 | bool is_read; | |
53 | bool is_linear; | |
54 | } QEMUWin32AIOCB; | |
55 | ||
56 | /* | |
57 | * Completes an AIO request (calls the callback and frees the ACB). | |
58 | */ | |
59 | static void win32_aio_process_completion(QEMUWin32AIOState *s, | |
60 | QEMUWin32AIOCB *waiocb, DWORD count) | |
61 | { | |
62 | int ret; | |
63 | s->count--; | |
64 | ||
65 | if (waiocb->ov.Internal != 0) { | |
66 | ret = -EIO; | |
67 | } else { | |
68 | ret = 0; | |
69 | if (count < waiocb->nbytes) { | |
70 | /* Short reads mean EOF, pad with zeros. */ | |
71 | if (waiocb->is_read) { | |
72 | qemu_iovec_memset(waiocb->qiov, count, 0, | |
73 | waiocb->qiov->size - count); | |
74 | } else { | |
75 | ret = -EINVAL; | |
76 | } | |
77 | } | |
78 | } | |
79 | ||
80 | if (!waiocb->is_linear) { | |
81 | if (ret == 0 && waiocb->is_read) { | |
82 | QEMUIOVector *qiov = waiocb->qiov; | |
83 | char *p = waiocb->buf; | |
84 | int i; | |
85 | ||
86 | for (i = 0; i < qiov->niov; ++i) { | |
87 | memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len); | |
88 | p += qiov->iov[i].iov_len; | |
89 | } | |
90 | g_free(waiocb->buf); | |
91 | } | |
92 | } | |
93 | ||
94 | ||
95 | waiocb->common.cb(waiocb->common.opaque, ret); | |
96 | qemu_aio_release(waiocb); | |
97 | } | |
98 | ||
99 | static void win32_aio_completion_cb(EventNotifier *e) | |
100 | { | |
101 | QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e); | |
102 | DWORD count; | |
103 | ULONG_PTR key; | |
104 | OVERLAPPED *ov; | |
105 | ||
106 | event_notifier_test_and_clear(&s->e); | |
107 | while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) { | |
108 | QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov); | |
109 | ||
110 | win32_aio_process_completion(s, waiocb, count); | |
111 | } | |
112 | } | |
113 | ||
114 | static int win32_aio_flush_cb(EventNotifier *e) | |
115 | { | |
116 | QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e); | |
117 | ||
118 | return (s->count > 0) ? 1 : 0; | |
119 | } | |
120 | ||
121 | static void win32_aio_cancel(BlockDriverAIOCB *blockacb) | |
122 | { | |
123 | QEMUWin32AIOCB *waiocb = (QEMUWin32AIOCB *)blockacb; | |
124 | ||
125 | /* | |
126 | * CancelIoEx is only supported in Vista and newer. For now, just | |
127 | * wait for completion. | |
128 | */ | |
129 | while (!HasOverlappedIoCompleted(&waiocb->ov)) { | |
130 | qemu_aio_wait(); | |
131 | } | |
132 | } | |
133 | ||
d7331bed | 134 | static const AIOCBInfo win32_aiocb_info = { |
a2736526 PB |
135 | .aiocb_size = sizeof(QEMUWin32AIOCB), |
136 | .cancel = win32_aio_cancel, | |
137 | }; | |
138 | ||
139 | BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs, | |
140 | QEMUWin32AIOState *aio, HANDLE hfile, | |
141 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
142 | BlockDriverCompletionFunc *cb, void *opaque, int type) | |
143 | { | |
144 | struct QEMUWin32AIOCB *waiocb; | |
145 | uint64_t offset = sector_num * 512; | |
146 | DWORD rc; | |
147 | ||
d7331bed | 148 | waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque); |
a2736526 PB |
149 | waiocb->nbytes = nb_sectors * 512; |
150 | waiocb->qiov = qiov; | |
151 | waiocb->is_read = (type == QEMU_AIO_READ); | |
152 | ||
153 | if (qiov->niov > 1) { | |
154 | waiocb->buf = qemu_blockalign(bs, qiov->size); | |
155 | if (type & QEMU_AIO_WRITE) { | |
156 | char *p = waiocb->buf; | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < qiov->niov; ++i) { | |
160 | memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len); | |
161 | p += qiov->iov[i].iov_len; | |
162 | } | |
163 | } | |
164 | waiocb->is_linear = false; | |
165 | } else { | |
166 | waiocb->buf = qiov->iov[0].iov_base; | |
167 | waiocb->is_linear = true; | |
168 | } | |
169 | ||
cee40d2d SW |
170 | memset(&waiocb->ov, 0, sizeof(waiocb->ov)); |
171 | waiocb->ov.Offset = (DWORD)offset; | |
172 | waiocb->ov.OffsetHigh = (DWORD)(offset >> 32); | |
173 | waiocb->ov.hEvent = event_notifier_get_handle(&aio->e); | |
174 | ||
a2736526 PB |
175 | aio->count++; |
176 | ||
177 | if (type & QEMU_AIO_READ) { | |
178 | rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov); | |
179 | } else { | |
180 | rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov); | |
181 | } | |
182 | if(rc == 0 && GetLastError() != ERROR_IO_PENDING) { | |
183 | goto out_dec_count; | |
184 | } | |
185 | return &waiocb->common; | |
186 | ||
187 | out_dec_count: | |
188 | aio->count--; | |
189 | qemu_aio_release(waiocb); | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile) | |
194 | { | |
195 | if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) { | |
196 | return -EINVAL; | |
197 | } else { | |
198 | return 0; | |
199 | } | |
200 | } | |
201 | ||
202 | QEMUWin32AIOState *win32_aio_init(void) | |
203 | { | |
204 | QEMUWin32AIOState *s; | |
205 | ||
206 | s = g_malloc0(sizeof(*s)); | |
207 | if (event_notifier_init(&s->e, false) < 0) { | |
208 | goto out_free_state; | |
209 | } | |
210 | ||
211 | s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0); | |
212 | if (s->hIOCP == NULL) { | |
213 | goto out_close_efd; | |
214 | } | |
215 | ||
216 | qemu_aio_set_event_notifier(&s->e, win32_aio_completion_cb, | |
217 | win32_aio_flush_cb); | |
218 | ||
219 | return s; | |
220 | ||
221 | out_close_efd: | |
222 | event_notifier_cleanup(&s->e); | |
223 | out_free_state: | |
224 | g_free(s); | |
225 | return NULL; | |
226 | } |