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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" | |
1de7afc9 | 25 | #include "qemu/timer.h" |
737e150e | 26 | #include "block/block_int.h" |
1de7afc9 | 27 | #include "qemu/module.h" |
a2736526 | 28 | #include "qemu-common.h" |
737e150e | 29 | #include "block/aio.h" |
a2736526 | 30 | #include "raw-aio.h" |
1de7afc9 | 31 | #include "qemu/event_notifier.h" |
3249dbe6 | 32 | #include "qemu/iov.h" |
a2736526 PB |
33 | #include <windows.h> |
34 | #include <winioctl.h> | |
35 | ||
36 | #define FTYPE_FILE 0 | |
37 | #define FTYPE_CD 1 | |
38 | #define FTYPE_HARDDISK 2 | |
39 | ||
40 | struct QEMUWin32AIOState { | |
41 | HANDLE hIOCP; | |
42 | EventNotifier e; | |
43 | int count; | |
44 | }; | |
45 | ||
46 | typedef struct QEMUWin32AIOCB { | |
47 | BlockDriverAIOCB common; | |
48 | struct QEMUWin32AIOState *ctx; | |
49 | int nbytes; | |
50 | OVERLAPPED ov; | |
51 | QEMUIOVector *qiov; | |
52 | void *buf; | |
53 | bool is_read; | |
54 | bool is_linear; | |
55 | } QEMUWin32AIOCB; | |
56 | ||
57 | /* | |
58 | * Completes an AIO request (calls the callback and frees the ACB). | |
59 | */ | |
60 | static void win32_aio_process_completion(QEMUWin32AIOState *s, | |
61 | QEMUWin32AIOCB *waiocb, DWORD count) | |
62 | { | |
63 | int ret; | |
64 | s->count--; | |
65 | ||
66 | if (waiocb->ov.Internal != 0) { | |
67 | ret = -EIO; | |
68 | } else { | |
69 | ret = 0; | |
70 | if (count < waiocb->nbytes) { | |
71 | /* Short reads mean EOF, pad with zeros. */ | |
72 | if (waiocb->is_read) { | |
73 | qemu_iovec_memset(waiocb->qiov, count, 0, | |
74 | waiocb->qiov->size - count); | |
75 | } else { | |
76 | ret = -EINVAL; | |
77 | } | |
78 | } | |
79 | } | |
80 | ||
81 | if (!waiocb->is_linear) { | |
82 | if (ret == 0 && waiocb->is_read) { | |
83 | QEMUIOVector *qiov = waiocb->qiov; | |
3249dbe6 | 84 | iov_from_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size); |
a2736526 | 85 | } |
e8bccad5 | 86 | qemu_vfree(waiocb->buf); |
a2736526 PB |
87 | } |
88 | ||
89 | ||
90 | waiocb->common.cb(waiocb->common.opaque, ret); | |
91 | qemu_aio_release(waiocb); | |
92 | } | |
93 | ||
94 | static void win32_aio_completion_cb(EventNotifier *e) | |
95 | { | |
96 | QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e); | |
97 | DWORD count; | |
98 | ULONG_PTR key; | |
99 | OVERLAPPED *ov; | |
100 | ||
101 | event_notifier_test_and_clear(&s->e); | |
102 | while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) { | |
103 | QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov); | |
104 | ||
105 | win32_aio_process_completion(s, waiocb, count); | |
106 | } | |
107 | } | |
108 | ||
109 | static int win32_aio_flush_cb(EventNotifier *e) | |
110 | { | |
111 | QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e); | |
112 | ||
113 | return (s->count > 0) ? 1 : 0; | |
114 | } | |
115 | ||
116 | static void win32_aio_cancel(BlockDriverAIOCB *blockacb) | |
117 | { | |
118 | QEMUWin32AIOCB *waiocb = (QEMUWin32AIOCB *)blockacb; | |
119 | ||
120 | /* | |
121 | * CancelIoEx is only supported in Vista and newer. For now, just | |
122 | * wait for completion. | |
123 | */ | |
124 | while (!HasOverlappedIoCompleted(&waiocb->ov)) { | |
125 | qemu_aio_wait(); | |
126 | } | |
127 | } | |
128 | ||
d7331bed | 129 | static const AIOCBInfo win32_aiocb_info = { |
a2736526 PB |
130 | .aiocb_size = sizeof(QEMUWin32AIOCB), |
131 | .cancel = win32_aio_cancel, | |
132 | }; | |
133 | ||
134 | BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs, | |
135 | QEMUWin32AIOState *aio, HANDLE hfile, | |
136 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
137 | BlockDriverCompletionFunc *cb, void *opaque, int type) | |
138 | { | |
139 | struct QEMUWin32AIOCB *waiocb; | |
140 | uint64_t offset = sector_num * 512; | |
141 | DWORD rc; | |
142 | ||
d7331bed | 143 | waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque); |
a2736526 PB |
144 | waiocb->nbytes = nb_sectors * 512; |
145 | waiocb->qiov = qiov; | |
146 | waiocb->is_read = (type == QEMU_AIO_READ); | |
147 | ||
148 | if (qiov->niov > 1) { | |
149 | waiocb->buf = qemu_blockalign(bs, qiov->size); | |
150 | if (type & QEMU_AIO_WRITE) { | |
3249dbe6 | 151 | iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size); |
a2736526 PB |
152 | } |
153 | waiocb->is_linear = false; | |
154 | } else { | |
155 | waiocb->buf = qiov->iov[0].iov_base; | |
156 | waiocb->is_linear = true; | |
157 | } | |
158 | ||
cee40d2d SW |
159 | memset(&waiocb->ov, 0, sizeof(waiocb->ov)); |
160 | waiocb->ov.Offset = (DWORD)offset; | |
161 | waiocb->ov.OffsetHigh = (DWORD)(offset >> 32); | |
162 | waiocb->ov.hEvent = event_notifier_get_handle(&aio->e); | |
163 | ||
a2736526 PB |
164 | aio->count++; |
165 | ||
166 | if (type & QEMU_AIO_READ) { | |
167 | rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov); | |
168 | } else { | |
169 | rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov); | |
170 | } | |
171 | if(rc == 0 && GetLastError() != ERROR_IO_PENDING) { | |
172 | goto out_dec_count; | |
173 | } | |
174 | return &waiocb->common; | |
175 | ||
176 | out_dec_count: | |
177 | aio->count--; | |
178 | qemu_aio_release(waiocb); | |
179 | return NULL; | |
180 | } | |
181 | ||
182 | int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile) | |
183 | { | |
184 | if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) { | |
185 | return -EINVAL; | |
186 | } else { | |
187 | return 0; | |
188 | } | |
189 | } | |
190 | ||
191 | QEMUWin32AIOState *win32_aio_init(void) | |
192 | { | |
193 | QEMUWin32AIOState *s; | |
194 | ||
195 | s = g_malloc0(sizeof(*s)); | |
196 | if (event_notifier_init(&s->e, false) < 0) { | |
197 | goto out_free_state; | |
198 | } | |
199 | ||
200 | s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0); | |
201 | if (s->hIOCP == NULL) { | |
202 | goto out_close_efd; | |
203 | } | |
204 | ||
205 | qemu_aio_set_event_notifier(&s->e, win32_aio_completion_cb, | |
206 | win32_aio_flush_cb); | |
207 | ||
208 | return s; | |
209 | ||
210 | out_close_efd: | |
211 | event_notifier_cleanup(&s->e); | |
212 | out_free_state: | |
213 | g_free(s); | |
214 | return NULL; | |
215 | } |