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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/* $Id: VDIoBackend.cpp $ */
/** @file
* VBox HDD container test utility, I/O backend API
*/
/*
* Copyright (C) 2013-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOGGROUP LOGGROUP_DEFAULT /** @todo Log group */
#include <iprt/errcore.h>
#include <iprt/log.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#include <iprt/mem.h>
#include <iprt/file.h>
#include <iprt/string.h>
#include "VDIoBackend.h"
#include "VDMemDisk.h"
#include "VDIoBackendMem.h"
typedef struct VDIOBACKEND
{
/** Memory I/O backend handle. */
PVDIOBACKENDMEM pIoMem;
/** Users of the memory backend. */
volatile uint32_t cRefsIoMem;
/** Users of the file backend. */
volatile uint32_t cRefsFile;
} VDIOBACKEND;
typedef struct VDIOSTORAGE
{
/** Pointer to the I/O backend parent. */
PVDIOBACKEND pIoBackend;
/** Completion callback. */
PFNVDIOCOMPLETE pfnComplete;
/** Flag whether this storage is backed by a file or memory.disk. */
bool fMemory;
/** Type dependent data. */
union
{
/** Memory disk handle. */
PVDMEMDISK pMemDisk;
/** file handle. */
RTFILE hFile;
} u;
} VDIOSTORAGE;
int VDIoBackendCreate(PPVDIOBACKEND ppIoBackend)
{
int rc = VINF_SUCCESS;
PVDIOBACKEND pIoBackend;
pIoBackend = (PVDIOBACKEND)RTMemAllocZ(sizeof(VDIOBACKEND));
if (pIoBackend)
*ppIoBackend = pIoBackend;
else
rc = VERR_NO_MEMORY;
return rc;
}
void VDIoBackendDestroy(PVDIOBACKEND pIoBackend)
{
if (pIoBackend->pIoMem)
VDIoBackendMemDestroy(pIoBackend->pIoMem);
RTMemFree(pIoBackend);
}
int VDIoBackendStorageCreate(PVDIOBACKEND pIoBackend, const char *pszBackend,
const char *pszName, PFNVDIOCOMPLETE pfnComplete,
PPVDIOSTORAGE ppIoStorage)
{
int rc = VINF_SUCCESS;
PVDIOSTORAGE pIoStorage = (PVDIOSTORAGE)RTMemAllocZ(sizeof(VDIOSTORAGE));
if (pIoStorage)
{
pIoStorage->pIoBackend = pIoBackend;
pIoStorage->pfnComplete = pfnComplete;
if (!strcmp(pszBackend, "memory"))
{
pIoStorage->fMemory = true;
rc = VDMemDiskCreate(&pIoStorage->u.pMemDisk, 0 /* Growing */);
if (RT_SUCCESS(rc))
{
uint32_t cRefs = ASMAtomicIncU32(&pIoBackend->cRefsIoMem);
if ( cRefs == 1
&& !pIoBackend->pIoMem)
{
rc = VDIoBackendMemCreate(&pIoBackend->pIoMem);
if (RT_FAILURE(rc))
VDMemDiskDestroy(pIoStorage->u.pMemDisk);
}
}
}
else if (!strcmp(pszBackend, "file"))
{
/* Create file. */
rc = RTFileOpen(&pIoStorage->u.hFile, pszName,
RTFILE_O_READWRITE | RTFILE_O_CREATE | RTFILE_O_ASYNC_IO | RTFILE_O_NO_CACHE | RTFILE_O_DENY_NONE);
if (RT_FAILURE(rc))
ASMAtomicDecU32(&pIoBackend->cRefsFile);
}
else
rc = VERR_NOT_SUPPORTED;
if (RT_FAILURE(rc))
RTMemFree(pIoStorage);
else
*ppIoStorage = pIoStorage;
}
else
rc = VERR_NO_MEMORY;
return rc;
}
void VDIoBackendStorageDestroy(PVDIOSTORAGE pIoStorage)
{
if (pIoStorage->fMemory)
{
VDMemDiskDestroy(pIoStorage->u.pMemDisk);
ASMAtomicDecU32(&pIoStorage->pIoBackend->cRefsIoMem);
}
else
{
RTFileClose(pIoStorage->u.hFile);
ASMAtomicDecU32(&pIoStorage->pIoBackend->cRefsFile);
}
RTMemFree(pIoStorage);
}
int VDIoBackendTransfer(PVDIOSTORAGE pIoStorage, VDIOTXDIR enmTxDir, uint64_t off,
size_t cbTransfer, PRTSGBUF pSgBuf, void *pvUser, bool fSync)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
{
if (!fSync)
{
rc = VDIoBackendMemTransfer(pIoStorage->pIoBackend->pIoMem, pIoStorage->u.pMemDisk,
enmTxDir, off, cbTransfer, pSgBuf, pIoStorage->pfnComplete,
pvUser);
}
else
{
switch (enmTxDir)
{
case VDIOTXDIR_READ:
rc = VDMemDiskRead(pIoStorage->u.pMemDisk, off, cbTransfer, pSgBuf);
break;
case VDIOTXDIR_WRITE:
rc = VDMemDiskWrite(pIoStorage->u.pMemDisk, off, cbTransfer, pSgBuf);
break;
case VDIOTXDIR_FLUSH:
break;
default:
AssertMsgFailed(("Invalid transfer type %d\n", enmTxDir));
}
}
}
else
{
if (!fSync)
rc = VERR_NOT_IMPLEMENTED;
else
{
switch (enmTxDir)
{
case VDIOTXDIR_READ:
rc = RTFileSgReadAt(pIoStorage->u.hFile, off, pSgBuf, cbTransfer, NULL);
break;
case VDIOTXDIR_WRITE:
rc = RTFileSgWriteAt(pIoStorage->u.hFile, off, pSgBuf, cbTransfer, NULL);
break;
case VDIOTXDIR_FLUSH:
rc = RTFileFlush(pIoStorage->u.hFile);
break;
default:
AssertMsgFailed(("Invalid transfer type %d\n", enmTxDir));
}
}
}
return rc;
}
int VDIoBackendStorageSetSize(PVDIOSTORAGE pIoStorage, uint64_t cbSize)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
{
rc = VDMemDiskSetSize(pIoStorage->u.pMemDisk, cbSize);
}
else
rc = RTFileSetSize(pIoStorage->u.hFile, cbSize);
return rc;
}
int VDIoBackendStorageGetSize(PVDIOSTORAGE pIoStorage, uint64_t *pcbSize)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
{
rc = VDMemDiskGetSize(pIoStorage->u.pMemDisk, pcbSize);
}
else
rc = RTFileQuerySize(pIoStorage->u.hFile, pcbSize);
return rc;
}
DECLHIDDEN(int) VDIoBackendDumpToFile(PVDIOSTORAGE pIoStorage, const char *pszPath)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
rc = VDMemDiskWriteToFile(pIoStorage->u.pMemDisk, pszPath);
else
rc = VERR_NOT_IMPLEMENTED;
return rc;
}
|
