Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / block / win32-aio.c
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/block_int.h"
27 #include "qemu/module.h"
28 #include "block/aio.h"
29 #include "raw-aio.h"
30 #include "qemu/event_notifier.h"
31 #include "qemu/iov.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 iov_from_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
84 }
85 qemu_vfree(waiocb->buf);
86 }
87
88
89 waiocb->common.cb(waiocb->common.opaque, ret);
90 qemu_aio_release(waiocb);
91 }
92
93 static void win32_aio_completion_cb(EventNotifier *e)
94 {
95 QEMUWin32AIOState *s = container_of(e, QEMUWin32AIOState, e);
96 DWORD count;
97 ULONG_PTR key;
98 OVERLAPPED *ov;
99
100 event_notifier_test_and_clear(&s->e);
101 while (GetQueuedCompletionStatus(s->hIOCP, &count, &key, &ov, 0)) {
102 QEMUWin32AIOCB *waiocb = container_of(ov, QEMUWin32AIOCB, ov);
103
104 win32_aio_process_completion(s, waiocb, count);
105 }
106 }
107
108 static void win32_aio_cancel(BlockDriverAIOCB *blockacb)
109 {
110 QEMUWin32AIOCB *waiocb = (QEMUWin32AIOCB *)blockacb;
111
112 /*
113 * CancelIoEx is only supported in Vista and newer. For now, just
114 * wait for completion.
115 */
116 while (!HasOverlappedIoCompleted(&waiocb->ov)) {
117 qemu_aio_wait();
118 }
119 }
120
121 static const AIOCBInfo win32_aiocb_info = {
122 .aiocb_size = sizeof(QEMUWin32AIOCB),
123 .cancel = win32_aio_cancel,
124 };
125
126 BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs,
127 QEMUWin32AIOState *aio, HANDLE hfile,
128 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
129 BlockDriverCompletionFunc *cb, void *opaque, int type)
130 {
131 struct QEMUWin32AIOCB *waiocb;
132 uint64_t offset = sector_num * 512;
133 DWORD rc;
134
135 waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque);
136 waiocb->nbytes = nb_sectors * 512;
137 waiocb->qiov = qiov;
138 waiocb->is_read = (type == QEMU_AIO_READ);
139
140 if (qiov->niov > 1) {
141 waiocb->buf = qemu_blockalign(bs, qiov->size);
142 if (type & QEMU_AIO_WRITE) {
143 iov_to_buf(qiov->iov, qiov->niov, 0, waiocb->buf, qiov->size);
144 }
145 waiocb->is_linear = false;
146 } else {
147 waiocb->buf = qiov->iov[0].iov_base;
148 waiocb->is_linear = true;
149 }
150
151 memset(&waiocb->ov, 0, sizeof(waiocb->ov));
152 waiocb->ov.Offset = (DWORD)offset;
153 waiocb->ov.OffsetHigh = (DWORD)(offset >> 32);
154 waiocb->ov.hEvent = event_notifier_get_handle(&aio->e);
155
156 aio->count++;
157
158 if (type & QEMU_AIO_READ) {
159 rc = ReadFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
160 } else {
161 rc = WriteFile(hfile, waiocb->buf, waiocb->nbytes, NULL, &waiocb->ov);
162 }
163 if(rc == 0 && GetLastError() != ERROR_IO_PENDING) {
164 goto out_dec_count;
165 }
166 return &waiocb->common;
167
168 out_dec_count:
169 aio->count--;
170 qemu_aio_release(waiocb);
171 return NULL;
172 }
173
174 int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
175 {
176 if (CreateIoCompletionPort(hfile, aio->hIOCP, (ULONG_PTR) 0, 0) == NULL) {
177 return -EINVAL;
178 } else {
179 return 0;
180 }
181 }
182
183 QEMUWin32AIOState *win32_aio_init(void)
184 {
185 QEMUWin32AIOState *s;
186
187 s = g_malloc0(sizeof(*s));
188 if (event_notifier_init(&s->e, false) < 0) {
189 goto out_free_state;
190 }
191
192 s->hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
193 if (s->hIOCP == NULL) {
194 goto out_close_efd;
195 }
196
197 qemu_aio_set_event_notifier(&s->e, win32_aio_completion_cb);
198
199 return s;
200
201 out_close_efd:
202 event_notifier_cleanup(&s->e);
203 out_free_state:
204 g_free(s);
205 return NULL;
206 }