Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 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" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 25 | #include "qemu/timer.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 26 | #include "block/block_int.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 27 | #include "qemu/module.h" |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 28 | #include "qemu-common.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 29 | #include "block/aio.h" |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 30 | #include "raw-aio.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 31 | #include "qemu/event_notifier.h" |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 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 | } |
Markus Armbruster | 7479acd | 2013-01-15 14:23:39 +0100 | [diff] [blame] | 90 | qemu_vfree(waiocb->buf); |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 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 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 134 | static const AIOCBInfo win32_aiocb_info = { |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 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 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 148 | waiocb = qemu_aio_get(&win32_aiocb_info, bs, cb, opaque); |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 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 | |
Stefan Weil | cee40d2 | 2012-11-04 12:09:34 +0100 | [diff] [blame] | 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 | |
Paolo Bonzini | a273652 | 2012-10-26 11:43:58 +0200 | [diff] [blame] | 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 | } |