VDI.cpp@ 41661

Last change on this file since 41661 was 40953, checked in by vboxsync, 13 years ago
Storage/VDI: Another small fix for newly created images, which lacked the file information string at the beginning. Harmless bug because the string is not used
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 133.6 KB

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1	/* $Id: VDI.cpp 40953 2012-04-16 20:10:59Z vboxsync $ */
2	/** @file
3	* Virtual Disk Image (VDI), Core Code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2011 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_VD_VDI
22	#include <VBox/vd-plugin.h>
23	#include "VDICore.h"
24	#include <VBox/err.h>
25
26	#include <VBox/log.h>
27	#include <iprt/alloc.h>
28	#include <iprt/assert.h>
29	#include <iprt/uuid.h>
30	#include <iprt/string.h>
31	#include <iprt/asm.h>
32
33	#define VDI_IMAGE_DEFAULT_BLOCK_SIZE _1M
34
35	/** Macros for endianess conversion. */
36	#define SET_ENDIAN_U32(conv, u32) (conv == VDIECONV_H2F ? RT_H2LE_U32(u32) : RT_LE2H_U32(u32))
37	#define SET_ENDIAN_U64(conv, u64) (conv == VDIECONV_H2F ? RT_H2LE_U64(u64) : RT_LE2H_U64(u64))
38
39	/*******************************************************************************
40	* Static Variables *
41	*******************************************************************************/
42
43	/** NULL-terminated array of supported file extensions. */
44	static const VDFILEEXTENSION s_aVdiFileExtensions[] =
45	{
46	{"vdi", VDTYPE_HDD},
47	{NULL, VDTYPE_INVALID}
48	};
49
50	/*******************************************************************************
51	* Internal Functions *
52	*******************************************************************************/
53	static unsigned getPowerOfTwo(unsigned uNumber);
54	static void vdiInitPreHeader(PVDIPREHEADER pPreHdr);
55	static int vdiValidatePreHeader(PVDIPREHEADER pPreHdr);
56	static void vdiInitHeader(PVDIHEADER pHeader, uint32_t uImageFlags,
57	const char *pszComment, uint64_t cbDisk,
58	uint32_t cbBlock, uint32_t cbBlockExtra);
59	static int vdiValidateHeader(PVDIHEADER pHeader);
60	static void vdiSetupImageDesc(PVDIIMAGEDESC pImage);
61	static int vdiUpdateHeader(PVDIIMAGEDESC pImage);
62	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock);
63	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx);
64	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock, PVDIOCTX pIoCtx,
65	bool fUpdateHdr);
66
67	/**
68	* Internal: Convert the PreHeader fields to the appropriate endianess.
69	* @param enmConv Direction of the conversion.
70	* @param pPreHdrConv Where to store the converted pre header.
71	* @param pPreHdr PreHeader pointer.
72	*/
73	static void vdiConvPreHeaderEndianess(VDIECONV enmConv, PVDIPREHEADER pPreHdrConv,
74	PVDIPREHEADER pPreHdr)
75	{
76	memcpy(pPreHdrConv->szFileInfo, pPreHdr->szFileInfo, sizeof(pPreHdr->szFileInfo));
77	pPreHdrConv->u32Signature = SET_ENDIAN_U32(enmConv, pPreHdr->u32Signature);
78	pPreHdrConv->u32Version = SET_ENDIAN_U32(enmConv, pPreHdr->u32Version);
79	}
80
81	/**
82	* Internal: Convert the VDIDISKGEOMETRY fields to the appropriate endianess.
83	* @param enmConv Direction of the conversion.
84	* @param pDiskGeoConv Where to store the converted geometry.
85	* @param pDiskGeo Pointer to the disk geometry to convert.
86	*/
87	static void vdiConvGeometryEndianess(VDIECONV enmConv, PVDIDISKGEOMETRY pDiskGeoConv,
88	PVDIDISKGEOMETRY pDiskGeo)
89	{
90	pDiskGeoConv->cCylinders = SET_ENDIAN_U32(enmConv, pDiskGeo->cCylinders);
91	pDiskGeoConv->cHeads = SET_ENDIAN_U32(enmConv, pDiskGeo->cHeads);
92	pDiskGeoConv->cSectors = SET_ENDIAN_U32(enmConv, pDiskGeo->cSectors);
93	pDiskGeoConv->cbSector = SET_ENDIAN_U32(enmConv, pDiskGeo->cbSector);
94	}
95
96	/**
97	* Internal: Convert the Header - version 0 fields to the appropriate endianess.
98	* @param enmConv Direction of the conversion.
99	* @param pHdrConv Where to store the converted header.
100	* @param pHdr Pointer to the version 0 header.
101	*/
102	static void vdiConvHeaderEndianessV0(VDIECONV enmConv, PVDIHEADER0 pHdrConv,
103	PVDIHEADER0 pHdr)
104	{
105	pHdrConv->u32Type = SET_ENDIAN_U32(enmConv, pHdr->u32Type);
106	pHdrConv->fFlags = SET_ENDIAN_U32(enmConv, pHdr->fFlags);
107	vdiConvGeometryEndianess(enmConv, &pHdrConv->LegacyGeometry, &pHdr->LegacyGeometry);
108	pHdrConv->cbDisk = SET_ENDIAN_U64(enmConv, pHdr->cbDisk);
109	pHdrConv->cbBlock = SET_ENDIAN_U32(enmConv, pHdr->cbBlock);
110	pHdrConv->cBlocks = SET_ENDIAN_U32(enmConv, pHdr->cBlocks);
111	pHdrConv->cBlocksAllocated = SET_ENDIAN_U32(enmConv, pHdr->cBlocksAllocated);
112	/* Don't convert the RTUUID fields. */
113	pHdrConv->uuidCreate = pHdr->uuidCreate;
114	pHdrConv->uuidModify = pHdr->uuidModify;
115	pHdrConv->uuidLinkage = pHdr->uuidLinkage;
116	}
117
118	/**
119	* Internal: Set the Header - version 1 fields to the appropriate endianess.
120	* @param enmConv Direction of the conversion.
121	* @param pHdrConv Where to store the converted header.
122	* @param pHdr Version 1 Header pointer.
123	*/
124	static void vdiConvHeaderEndianessV1(VDIECONV enmConv, PVDIHEADER1 pHdrConv,
125	PVDIHEADER1 pHdr)
126	{
127	pHdrConv->cbHeader = SET_ENDIAN_U32(enmConv, pHdr->cbHeader);
128	pHdrConv->u32Type = SET_ENDIAN_U32(enmConv, pHdr->u32Type);
129	pHdrConv->fFlags = SET_ENDIAN_U32(enmConv, pHdr->fFlags);
130	pHdrConv->offBlocks = SET_ENDIAN_U32(enmConv, pHdr->offBlocks);
131	pHdrConv->offData = SET_ENDIAN_U32(enmConv, pHdr->offData);
132	vdiConvGeometryEndianess(enmConv, &pHdrConv->LegacyGeometry, &pHdr->LegacyGeometry);
133	pHdrConv->u32Dummy = SET_ENDIAN_U32(enmConv, pHdr->u32Dummy);
134	pHdrConv->cbDisk = SET_ENDIAN_U64(enmConv, pHdr->cbDisk);
135	pHdrConv->cbBlock = SET_ENDIAN_U32(enmConv, pHdr->cbBlock);
136	pHdrConv->cbBlockExtra = SET_ENDIAN_U32(enmConv, pHdr->cbBlockExtra);
137	pHdrConv->cBlocks = SET_ENDIAN_U32(enmConv, pHdr->cBlocks);
138	pHdrConv->cBlocksAllocated = SET_ENDIAN_U32(enmConv, pHdr->cBlocksAllocated);
139	/* Don't convert the RTUUID fields. */
140	pHdrConv->uuidCreate = pHdr->uuidCreate;
141	pHdrConv->uuidModify = pHdr->uuidModify;
142	pHdrConv->uuidLinkage = pHdr->uuidLinkage;
143	pHdrConv->uuidParentModify = pHdr->uuidParentModify;
144	}
145
146	/**
147	* Internal: Set the Header - version 1plus fields to the appropriate endianess.
148	* @param enmConv Direction of the conversion.
149	* @param pHdrConv Where to store the converted header.
150	* @param pHdr Version 1+ Header pointer.
151	*/
152	static void vdiConvHeaderEndianessV1p(VDIECONV enmConv, PVDIHEADER1PLUS pHdrConv,
153	PVDIHEADER1PLUS pHdr)
154	{
155	pHdrConv->cbHeader = SET_ENDIAN_U32(enmConv, pHdr->cbHeader);
156	pHdrConv->u32Type = SET_ENDIAN_U32(enmConv, pHdr->u32Type);
157	pHdrConv->fFlags = SET_ENDIAN_U32(enmConv, pHdr->fFlags);
158	pHdrConv->offBlocks = SET_ENDIAN_U32(enmConv, pHdr->offBlocks);
159	pHdrConv->offData = SET_ENDIAN_U32(enmConv, pHdr->offData);
160	vdiConvGeometryEndianess(enmConv, &pHdrConv->LegacyGeometry, &pHdr->LegacyGeometry);
161	pHdrConv->u32Dummy = SET_ENDIAN_U32(enmConv, pHdr->u32Dummy);
162	pHdrConv->cbDisk = SET_ENDIAN_U64(enmConv, pHdr->cbDisk);
163	pHdrConv->cbBlock = SET_ENDIAN_U32(enmConv, pHdr->cbBlock);
164	pHdrConv->cbBlockExtra = SET_ENDIAN_U32(enmConv, pHdr->cbBlockExtra);
165	pHdrConv->cBlocks = SET_ENDIAN_U32(enmConv, pHdr->cBlocks);
166	pHdrConv->cBlocksAllocated = SET_ENDIAN_U32(enmConv, pHdr->cBlocksAllocated);
167	/* Don't convert the RTUUID fields. */
168	pHdrConv->uuidCreate = pHdr->uuidCreate;
169	pHdrConv->uuidModify = pHdr->uuidModify;
170	pHdrConv->uuidLinkage = pHdr->uuidLinkage;
171	pHdrConv->uuidParentModify = pHdr->uuidParentModify;
172	vdiConvGeometryEndianess(enmConv, &pHdrConv->LCHSGeometry, &pHdr->LCHSGeometry);
173	}
174
175	/**
176	* Internal: Set the appropriate endianess on all the Blocks pointed.
177	* @param enmConv Direction of the conversion.
178	* @param paBlocks Pointer to the block array.
179	* @param cEntries Number of entries in the block array.
180	*
181	* @note Unlike the other conversion functions this method does an in place conversion
182	* to avoid temporary memory allocations when writing the block array.
183	*/
184	static void vdiConvBlocksEndianess(VDIECONV enmConv, PVDIIMAGEBLOCKPOINTER paBlocks,
185	unsigned cEntries)
186	{
187	for (unsigned i = 0; i < cEntries; i++)
188	paBlocks[i] = SET_ENDIAN_U32(enmConv, paBlocks[i]);
189	}
190
191	/**
192	* Internal: Flush the image file to disk.
193	*/
194	static void vdiFlushImage(PVDIIMAGEDESC pImage)
195	{
196	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
197	{
198	/* Save header. */
199	int rc = vdiUpdateHeader(pImage);
200	AssertMsgRC(rc, ("vdiUpdateHeader() failed, filename=\"%s\", rc=%Rrc\n",
201	pImage->pszFilename, rc));
202	vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
203	}
204	}
205
206	/**
207	* Internal: Free all allocated space for representing an image, and optionally
208	* delete the image from disk.
209	*/
210	static int vdiFreeImage(PVDIIMAGEDESC pImage, bool fDelete)
211	{
212	int rc = VINF_SUCCESS;
213
214	/* Freeing a never allocated image (e.g. because the open failed) is
215	* not signalled as an error. After all nothing bad happens. */
216	if (pImage)
217	{
218	if (pImage->pStorage)
219	{
220	/* No point updating the file that is deleted anyway. */
221	if (!fDelete)
222	vdiFlushImage(pImage);
223
224	vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
225	pImage->pStorage = NULL;
226	}
227
228	if (pImage->paBlocks)
229	{
230	RTMemFree(pImage->paBlocks);
231	pImage->paBlocks = NULL;
232	}
233
234	if (pImage->paBlocksRev)
235	{
236	RTMemFree(pImage->paBlocksRev);
237	pImage->paBlocksRev = NULL;
238	}
239
240	if (fDelete && pImage->pszFilename)
241	vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
242	}
243
244	LogFlowFunc(("returns %Rrc\n", rc));
245	return rc;
246	}
247
248	/**
249	* internal: return power of 2 or 0 if num error.
250	*/
251	static unsigned getPowerOfTwo(unsigned uNumber)
252	{
253	if (uNumber == 0)
254	return 0;
255	unsigned uPower2 = 0;
256	while ((uNumber & 1) == 0)
257	{
258	uNumber >>= 1;
259	uPower2++;
260	}
261	return uNumber == 1 ? uPower2 : 0;
262	}
263
264	/**
265	* Internal: Init VDI preheader.
266	*/
267	static void vdiInitPreHeader(PVDIPREHEADER pPreHdr)
268	{
269	pPreHdr->u32Signature = VDI_IMAGE_SIGNATURE;
270	pPreHdr->u32Version = VDI_IMAGE_VERSION;
271	memset(pPreHdr->szFileInfo, 0, sizeof(pPreHdr->szFileInfo));
272	strncat(pPreHdr->szFileInfo, VDI_IMAGE_FILE_INFO, sizeof(pPreHdr->szFileInfo)-1);
273	}
274
275	/**
276	* Internal: check VDI preheader.
277	*/
278	static int vdiValidatePreHeader(PVDIPREHEADER pPreHdr)
279	{
280	if (pPreHdr->u32Signature != VDI_IMAGE_SIGNATURE)
281	return VERR_VD_VDI_INVALID_HEADER;
282
283	if ( VDI_GET_VERSION_MAJOR(pPreHdr->u32Version) != VDI_IMAGE_VERSION_MAJOR
284	&& pPreHdr->u32Version != 0x00000002) /* old version. */
285	return VERR_VD_VDI_UNSUPPORTED_VERSION;
286
287	return VINF_SUCCESS;
288	}
289
290	/**
291	* Internal: translate VD image flags to VDI image type enum.
292	*/
293	static VDIIMAGETYPE vdiTranslateImageFlags2VDI(unsigned uImageFlags)
294	{
295	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
296	return VDI_IMAGE_TYPE_FIXED;
297	else if (uImageFlags & VD_IMAGE_FLAGS_DIFF)
298	return VDI_IMAGE_TYPE_DIFF;
299	else
300	return VDI_IMAGE_TYPE_NORMAL;
301	}
302
303	/**
304	* Internal: translate VDI image type enum to VD image type enum.
305	*/
306	static unsigned vdiTranslateVDI2ImageFlags(VDIIMAGETYPE enmType)
307	{
308	switch (enmType)
309	{
310	case VDI_IMAGE_TYPE_NORMAL:
311	return VD_IMAGE_FLAGS_NONE;
312	case VDI_IMAGE_TYPE_FIXED:
313	return VD_IMAGE_FLAGS_FIXED;
314	case VDI_IMAGE_TYPE_DIFF:
315	return VD_IMAGE_FLAGS_DIFF;
316	default:
317	AssertMsgFailed(("invalid VDIIMAGETYPE enmType=%d\n", (int)enmType));
318	return VD_IMAGE_FLAGS_NONE;
319	}
320	}
321
322	/**
323	* Internal: Init VDI header. Always use latest header version.
324	* @param pHeader Assumes it was initially initialized to all zeros.
325	*/
326	static void vdiInitHeader(PVDIHEADER pHeader, uint32_t uImageFlags,
327	const char *pszComment, uint64_t cbDisk,
328	uint32_t cbBlock, uint32_t cbBlockExtra)
329	{
330	pHeader->uVersion = VDI_IMAGE_VERSION;
331	pHeader->u.v1plus.cbHeader = sizeof(VDIHEADER1PLUS);
332	pHeader->u.v1plus.u32Type = (uint32_t)vdiTranslateImageFlags2VDI(uImageFlags);
333	pHeader->u.v1plus.fFlags = (uImageFlags & VD_VDI_IMAGE_FLAGS_ZERO_EXPAND) ? 1 : 0;
334	#ifdef VBOX_STRICT
335	char achZero[VDI_IMAGE_COMMENT_SIZE] = {0};
336	Assert(!memcmp(pHeader->u.v1plus.szComment, achZero, VDI_IMAGE_COMMENT_SIZE));
337	#endif
338	pHeader->u.v1plus.szComment[0] = '\0';
339	if (pszComment)
340	{
341	AssertMsg(strlen(pszComment) < sizeof(pHeader->u.v1plus.szComment),
342	("HDD Comment is too long, cb=%d\n", strlen(pszComment)));
343	strncat(pHeader->u.v1plus.szComment, pszComment, sizeof(pHeader->u.v1plus.szComment)-1);
344	}
345
346	/* Mark the legacy geometry not-calculated. */
347	pHeader->u.v1plus.LegacyGeometry.cCylinders = 0;
348	pHeader->u.v1plus.LegacyGeometry.cHeads = 0;
349	pHeader->u.v1plus.LegacyGeometry.cSectors = 0;
350	pHeader->u.v1plus.LegacyGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
351	pHeader->u.v1plus.u32Dummy = 0; /* used to be the translation value */
352
353	pHeader->u.v1plus.cbDisk = cbDisk;
354	pHeader->u.v1plus.cbBlock = cbBlock;
355	pHeader->u.v1plus.cBlocks = (uint32_t)(cbDisk / cbBlock);
356	if (cbDisk % cbBlock)
357	pHeader->u.v1plus.cBlocks++;
358	pHeader->u.v1plus.cbBlockExtra = cbBlockExtra;
359	pHeader->u.v1plus.cBlocksAllocated = 0;
360
361	/* Init offsets. */
362	pHeader->u.v1plus.offBlocks = RT_ALIGN_32(sizeof(VDIPREHEADER) + sizeof(VDIHEADER1PLUS), VDI_DATA_ALIGN);
363	pHeader->u.v1plus.offData = RT_ALIGN_32(pHeader->u.v1plus.offBlocks + (pHeader->u.v1plus.cBlocks * sizeof(VDIIMAGEBLOCKPOINTER)), VDI_DATA_ALIGN);
364
365	/* Init uuids. */
366	RTUuidCreate(&pHeader->u.v1plus.uuidCreate);
367	RTUuidClear(&pHeader->u.v1plus.uuidModify);
368	RTUuidClear(&pHeader->u.v1plus.uuidLinkage);
369	RTUuidClear(&pHeader->u.v1plus.uuidParentModify);
370
371	/* Mark LCHS geometry not-calculated. */
372	pHeader->u.v1plus.LCHSGeometry.cCylinders = 0;
373	pHeader->u.v1plus.LCHSGeometry.cHeads = 0;
374	pHeader->u.v1plus.LCHSGeometry.cSectors = 0;
375	pHeader->u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
376	}
377
378	/**
379	* Internal: Check VDI header.
380	*/
381	static int vdiValidateHeader(PVDIHEADER pHeader)
382	{
383	/* Check version-dependent header parameters. */
384	switch (GET_MAJOR_HEADER_VERSION(pHeader))
385	{
386	case 0:
387	{
388	/* Old header version. */
389	break;
390	}
391	case 1:
392	{
393	/* Current header version. */
394
395	if (pHeader->u.v1.cbHeader < sizeof(VDIHEADER1))
396	{
397	LogRel(("VDI: v1 header size wrong (%d < %d)\n",
398	pHeader->u.v1.cbHeader, sizeof(VDIHEADER1)));
399	return VERR_VD_VDI_INVALID_HEADER;
400	}
401
402	if (getImageBlocksOffset(pHeader) < (sizeof(VDIPREHEADER) + sizeof(VDIHEADER1)))
403	{
404	LogRel(("VDI: v1 blocks offset wrong (%d < %d)\n",
405	getImageBlocksOffset(pHeader), sizeof(VDIPREHEADER) + sizeof(VDIHEADER1)));
406	return VERR_VD_VDI_INVALID_HEADER;
407	}
408
409	if (getImageDataOffset(pHeader) < (getImageBlocksOffset(pHeader) + getImageBlocks(pHeader) * sizeof(VDIIMAGEBLOCKPOINTER)))
410	{
411	LogRel(("VDI: v1 image data offset wrong (%d < %d)\n",
412	getImageDataOffset(pHeader), getImageBlocksOffset(pHeader) + getImageBlocks(pHeader) * sizeof(VDIIMAGEBLOCKPOINTER)));
413	return VERR_VD_VDI_INVALID_HEADER;
414	}
415
416	break;
417	}
418	default:
419	/* Unsupported. */
420	return VERR_VD_VDI_UNSUPPORTED_VERSION;
421	}
422
423	/* Check common header parameters. */
424
425	bool fFailed = false;
426
427	if ( getImageType(pHeader) < VDI_IMAGE_TYPE_FIRST
428	\|\| getImageType(pHeader) > VDI_IMAGE_TYPE_LAST)
429	{
430	LogRel(("VDI: bad image type %d\n", getImageType(pHeader)));
431	fFailed = true;
432	}
433
434	if (getImageFlags(pHeader) & ~VD_VDI_IMAGE_FLAGS_MASK)
435	{
436	LogRel(("VDI: bad image flags %08x\n", getImageFlags(pHeader)));
437	fFailed = true;
438	}
439
440	if ( getImageLCHSGeometry(pHeader)
441	&& (getImageLCHSGeometry(pHeader))->cbSector != VDI_GEOMETRY_SECTOR_SIZE)
442	{
443	LogRel(("VDI: wrong sector size (%d != %d)\n",
444	(getImageLCHSGeometry(pHeader))->cbSector, VDI_GEOMETRY_SECTOR_SIZE));
445	fFailed = true;
446	}
447
448	if ( getImageDiskSize(pHeader) == 0
449	\|\| getImageBlockSize(pHeader) == 0
450	\|\| getImageBlocks(pHeader) == 0
451	\|\| getPowerOfTwo(getImageBlockSize(pHeader)) == 0)
452	{
453	LogRel(("VDI: wrong size (%lld, %d, %d, %d)\n",
454	getImageDiskSize(pHeader), getImageBlockSize(pHeader),
455	getImageBlocks(pHeader), getPowerOfTwo(getImageBlockSize(pHeader))));
456	fFailed = true;
457	}
458
459	if (getImageBlocksAllocated(pHeader) > getImageBlocks(pHeader))
460	{
461	LogRel(("VDI: too many blocks allocated (%d > %d)\n"
462	" blocksize=%d disksize=%lld\n",
463	getImageBlocksAllocated(pHeader), getImageBlocks(pHeader),
464	getImageBlockSize(pHeader), getImageDiskSize(pHeader)));
465	fFailed = true;
466	}
467
468	if ( getImageExtraBlockSize(pHeader) != 0
469	&& getPowerOfTwo(getImageExtraBlockSize(pHeader)) == 0)
470	{
471	LogRel(("VDI: wrong extra size (%d, %d)\n",
472	getImageExtraBlockSize(pHeader), getPowerOfTwo(getImageExtraBlockSize(pHeader))));
473	fFailed = true;
474	}
475
476	if ((uint64_t)getImageBlockSize(pHeader) * getImageBlocks(pHeader) < getImageDiskSize(pHeader))
477	{
478	LogRel(("VDI: wrong disk size (%d, %d, %lld)\n",
479	getImageBlockSize(pHeader), getImageBlocks(pHeader), getImageDiskSize(pHeader)));
480	fFailed = true;
481	}
482
483	if (RTUuidIsNull(getImageCreationUUID(pHeader)))
484	{
485	LogRel(("VDI: uuid of creator is 0\n"));
486	fFailed = true;
487	}
488
489	if (RTUuidIsNull(getImageModificationUUID(pHeader)))
490	{
491	LogRel(("VDI: uuid of modifier is 0\n"));
492	fFailed = true;
493	}
494
495	return fFailed ? VERR_VD_VDI_INVALID_HEADER : VINF_SUCCESS;
496	}
497
498	/**
499	* Internal: Set up VDIIMAGEDESC structure by image header.
500	*/
501	static void vdiSetupImageDesc(PVDIIMAGEDESC pImage)
502	{
503	pImage->uImageFlags = getImageFlags(&pImage->Header);
504	pImage->uImageFlags \|= vdiTranslateVDI2ImageFlags(getImageType(&pImage->Header));
505	pImage->offStartBlocks = getImageBlocksOffset(&pImage->Header);
506	pImage->offStartData = getImageDataOffset(&pImage->Header);
507	pImage->uBlockMask = getImageBlockSize(&pImage->Header) - 1;
508	pImage->uShiftOffset2Index = getPowerOfTwo(getImageBlockSize(&pImage->Header));
509	pImage->offStartBlockData = getImageExtraBlockSize(&pImage->Header);
510	pImage->cbTotalBlockData = pImage->offStartBlockData
511	+ getImageBlockSize(&pImage->Header);
512	}
513
514	/**
515	* Internal: Create VDI image file.
516	*/
517	static int vdiCreateImage(PVDIIMAGEDESC pImage, uint64_t cbSize,
518	unsigned uImageFlags, const char *pszComment,
519	PCVDGEOMETRY pPCHSGeometry,
520	PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
521	unsigned uOpenFlags, PFNVDPROGRESS pfnProgress,
522	void *pvUser, unsigned uPercentStart,
523	unsigned uPercentSpan)
524	{
525	int rc;
526	uint64_t cbTotal;
527	uint64_t cbFill;
528	uint64_t uOff;
529
530	AssertPtr(pPCHSGeometry);
531	AssertPtr(pLCHSGeometry);
532
533	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
534	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
535	AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
536
537	/* Special check for comment length. */
538	if ( VALID_PTR(pszComment)
539	&& strlen(pszComment) >= VDI_IMAGE_COMMENT_SIZE)
540	{
541	rc = vdIfError(pImage->pIfError, VERR_VD_VDI_COMMENT_TOO_LONG, RT_SRC_POS,
542	N_("VDI: comment is too long for '%s'"), pImage->pszFilename);
543	goto out;
544	}
545
546	vdiInitPreHeader(&pImage->PreHeader);
547	vdiInitHeader(&pImage->Header, uImageFlags, pszComment, cbSize, VDI_IMAGE_DEFAULT_BLOCK_SIZE, 0);
548	/* Save PCHS geometry. Not much work, and makes the flow of information
549	* quite a bit clearer - relying on the higher level isn't obvious. */
550	pImage->PCHSGeometry = *pPCHSGeometry;
551	/* Set LCHS geometry (legacy geometry is ignored for the current 1.1+). */
552	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = pLCHSGeometry->cCylinders;
553	pImage->Header.u.v1plus.LCHSGeometry.cHeads = pLCHSGeometry->cHeads;
554	pImage->Header.u.v1plus.LCHSGeometry.cSectors = pLCHSGeometry->cSectors;
555	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
556
557	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
558	if (!pImage->paBlocks)
559	{
560	rc = VERR_NO_MEMORY;
561	goto out;
562	}
563
564	if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
565	{
566	/* for growing images mark all blocks in paBlocks as free. */
567	for (unsigned i = 0; i < pImage->Header.u.v1.cBlocks; i++)
568	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
569	}
570	else
571	{
572	/* for fixed images mark all blocks in paBlocks as allocated */
573	for (unsigned i = 0; i < pImage->Header.u.v1.cBlocks; i++)
574	pImage->paBlocks[i] = i;
575	pImage->Header.u.v1.cBlocksAllocated = pImage->Header.u.v1.cBlocks;
576	}
577
578	/* Setup image parameters. */
579	vdiSetupImageDesc(pImage);
580
581	/* Create image file. */
582	rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
583	VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY,
584	true /* fCreate */),
585	&pImage->pStorage);
586	if (RT_FAILURE(rc))
587	{
588	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: cannot create image '%s'"),
589	pImage->pszFilename);
590	goto out;
591	}
592
593	cbTotal = pImage->offStartData
594	+ (uint64_t)getImageBlocks(&pImage->Header) * pImage->cbTotalBlockData;
595
596	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
597	{
598	/* Check the free space on the disk and leave early if there is not
599	* sufficient space available. */
600	int64_t cbFree = 0;
601	rc = vdIfIoIntFileGetFreeSpace(pImage->pIfIo, pImage->pszFilename, &cbFree);
602	if (RT_SUCCESS(rc) /* ignore errors */ && ((uint64_t)cbFree < cbTotal))
603	{
604	rc = vdIfError(pImage->pIfError, VERR_DISK_FULL, RT_SRC_POS,
605	N_("VDI: disk would overflow creating image '%s'"), pImage->pszFilename);
606	goto out;
607	}
608	}
609
610	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
611	{
612	/*
613	* Allocate & commit whole file if fixed image, it must be more
614	* effective than expanding file by write operations.
615	*/
616	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, cbTotal);
617	pImage->cbImage = cbTotal;
618	}
619	else
620	{
621	/* Set file size to hold header and blocks array. */
622	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->offStartData);
623	pImage->cbImage = pImage->offStartData;
624	}
625	if (RT_FAILURE(rc))
626	{
627	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: setting image size failed for '%s'"),
628	pImage->pszFilename);
629	goto out;
630	}
631
632	/* Use specified image uuid */
633	getImageCreationUUID(&pImage->Header) = pUuid;
634
635	/* Generate image last-modify uuid */
636	RTUuidCreate(getImageModificationUUID(&pImage->Header));
637
638	/* Write pre-header. */
639	VDIPREHEADER PreHeader;
640	vdiConvPreHeaderEndianess(VDIECONV_H2F, &PreHeader, &pImage->PreHeader);
641	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0,
642	&PreHeader, sizeof(PreHeader), NULL);
643	if (RT_FAILURE(rc))
644	{
645	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: writing pre-header failed for '%s'"),
646	pImage->pszFilename);
647	goto out;
648	}
649
650	/* Write header. */
651	VDIHEADER1PLUS Hdr;
652	vdiConvHeaderEndianessV1p(VDIECONV_H2F, &Hdr, &pImage->Header.u.v1plus);
653	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(pImage->PreHeader),
654	&Hdr, sizeof(Hdr), NULL);
655	if (RT_FAILURE(rc))
656	{
657	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: writing header failed for '%s'"),
658	pImage->pszFilename);
659	goto out;
660	}
661
662	vdiConvBlocksEndianess(VDIECONV_H2F, pImage->paBlocks, getImageBlocks(&pImage->Header));
663	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->offStartBlocks, pImage->paBlocks,
664	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
665	NULL);
666	vdiConvBlocksEndianess(VDIECONV_F2H, pImage->paBlocks, getImageBlocks(&pImage->Header));
667	if (RT_FAILURE(rc))
668	{
669	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: writing block pointers failed for '%s'"),
670	pImage->pszFilename);
671	goto out;
672	}
673
674	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
675	{
676	/* Fill image with zeroes. We do this for every fixed-size image since on some systems
677	* (for example Windows Vista), it takes ages to write a block near the end of a sparse
678	* file and the guest could complain about an ATA timeout. */
679
680	/** @todo Starting with Linux 2.6.23, there is an fallocate() system call.
681	* Currently supported file systems are ext4 and ocfs2. */
682
683	/* Allocate a temporary zero-filled buffer. Use a bigger block size to optimize writing */
684	const size_t cbBuf = 128 * _1K;
685	void *pvBuf = RTMemTmpAllocZ(cbBuf);
686	if (!pvBuf)
687	{
688	rc = VERR_NO_MEMORY;
689	goto out;
690	}
691
692	cbFill = (uint64_t)getImageBlocks(&pImage->Header) * pImage->cbTotalBlockData;
693	uOff = 0;
694	/* Write data to all image blocks. */
695	while (uOff < cbFill)
696	{
697	unsigned cbChunk = (unsigned)RT_MIN(cbFill, cbBuf);
698
699	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->offStartData + uOff,
700	pvBuf, cbChunk, NULL);
701	if (RT_FAILURE(rc))
702	{
703	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: writing block failed for '%s'"), pImage->pszFilename);
704	RTMemTmpFree(pvBuf);
705	goto out;
706	}
707
708	uOff += cbChunk;
709
710	if (pfnProgress)
711	{
712	rc = pfnProgress(pvUser,
713	uPercentStart + uOff * uPercentSpan / cbFill);
714	if (RT_FAILURE(rc))
715	goto out;
716	}
717	}
718	RTMemTmpFree(pvBuf);
719	}
720
721	out:
722	if (RT_SUCCESS(rc) && pfnProgress)
723	pfnProgress(pvUser, uPercentStart + uPercentSpan);
724
725	if (RT_FAILURE(rc))
726	vdiFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
727	return rc;
728	}
729
730	/**
731	* Internal: Open a VDI image.
732	*/
733	static int vdiOpenImage(PVDIIMAGEDESC pImage, unsigned uOpenFlags)
734	{
735	int rc;
736
737	pImage->uOpenFlags = uOpenFlags;
738
739	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
740	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
741	AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
742
743	/*
744	* Open the image.
745	*/
746	rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
747	VDOpenFlagsToFileOpenFlags(uOpenFlags, false /* fCreate */),
748	&pImage->pStorage);
749	if (RT_FAILURE(rc))
750	{
751	/* Do NOT signal an appropriate error here, as the VD layer has the
752	* choice of retrying the open if it failed. */
753	goto out;
754	}
755
756	/* Get file size. */
757	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage,
758	&pImage->cbImage);
759	if (RT_FAILURE(rc))
760	{
761	vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: error getting the image size in '%s'"), pImage->pszFilename);
762	rc = VERR_VD_VDI_INVALID_HEADER;
763	goto out;
764	}
765
766	/* Read pre-header. */
767	VDIPREHEADER PreHeader;
768	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0,
769	&PreHeader, sizeof(PreHeader), NULL);
770	if (RT_FAILURE(rc))
771	{
772	vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: error reading pre-header in '%s'"), pImage->pszFilename);
773	rc = VERR_VD_VDI_INVALID_HEADER;
774	goto out;
775	}
776	vdiConvPreHeaderEndianess(VDIECONV_F2H, &pImage->PreHeader, &PreHeader);
777	rc = vdiValidatePreHeader(&pImage->PreHeader);
778	if (RT_FAILURE(rc))
779	{
780	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: invalid pre-header in '%s'"), pImage->pszFilename);
781	goto out;
782	}
783
784	/* Read header. */
785	pImage->Header.uVersion = pImage->PreHeader.u32Version;
786	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
787	{
788	case 0:
789	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, sizeof(pImage->PreHeader),
790	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
791	NULL);
792	if (RT_FAILURE(rc))
793	{
794	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: error reading v0 header in '%s'"), pImage->pszFilename);
795	goto out;
796	}
797	vdiConvHeaderEndianessV0(VDIECONV_F2H, &pImage->Header.u.v0, &pImage->Header.u.v0);
798	break;
799	case 1:
800	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, sizeof(pImage->PreHeader),
801	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
802	NULL);
803	if (RT_FAILURE(rc))
804	{
805	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: error reading v1 header in '%s'"), pImage->pszFilename);
806	goto out;
807	}
808	vdiConvHeaderEndianessV1(VDIECONV_F2H, &pImage->Header.u.v1, &pImage->Header.u.v1);
809	/* Convert VDI 1.1 images to VDI 1.1+ on open in read/write mode.
810	* Conversion is harmless, as any VirtualBox version supporting VDI
811	* 1.1 doesn't touch fields it doesn't know about. */
812	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
813	&& GET_MINOR_HEADER_VERSION(&pImage->Header) == 1
814	&& pImage->Header.u.v1.cbHeader < sizeof(pImage->Header.u.v1plus))
815	{
816	pImage->Header.u.v1plus.cbHeader = sizeof(pImage->Header.u.v1plus);
817	/* Mark LCHS geometry not-calculated. */
818	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = 0;
819	pImage->Header.u.v1plus.LCHSGeometry.cHeads = 0;
820	pImage->Header.u.v1plus.LCHSGeometry.cSectors = 0;
821	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
822	}
823	else if (pImage->Header.u.v1.cbHeader >= sizeof(pImage->Header.u.v1plus))
824	{
825	/* Read the actual VDI 1.1+ header completely. */
826	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, sizeof(pImage->PreHeader),
827	&pImage->Header.u.v1plus,
828	sizeof(pImage->Header.u.v1plus), NULL);
829	if (RT_FAILURE(rc))
830	{
831	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: error reading v1.1+ header in '%s'"), pImage->pszFilename);
832	goto out;
833	}
834	vdiConvHeaderEndianessV1p(VDIECONV_F2H, &pImage->Header.u.v1plus, &pImage->Header.u.v1plus);
835	}
836	break;
837	default:
838	rc = vdIfError(pImage->pIfError, VERR_VD_VDI_UNSUPPORTED_VERSION, RT_SRC_POS, N_("VDI: unsupported major version %u in '%s'"), GET_MAJOR_HEADER_VERSION(&pImage->Header), pImage->pszFilename);
839	goto out;
840	}
841
842	rc = vdiValidateHeader(&pImage->Header);
843	if (RT_FAILURE(rc))
844	{
845	rc = vdIfError(pImage->pIfError, VERR_VD_VDI_INVALID_HEADER, RT_SRC_POS, N_("VDI: invalid header in '%s'"), pImage->pszFilename);
846	goto out;
847	}
848
849	/* Setup image parameters by header. */
850	vdiSetupImageDesc(pImage);
851
852	/* Allocate memory for blocks array. */
853	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
854	if (!pImage->paBlocks)
855	{
856	rc = VERR_NO_MEMORY;
857	goto out;
858	}
859
860	/* Read blocks array. */
861	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, pImage->offStartBlocks, pImage->paBlocks,
862	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
863	NULL);
864	if (RT_FAILURE(rc))
865	{
866	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VDI: Error reading the block table in '%s'"), pImage->pszFilename);
867	goto out;
868	}
869	vdiConvBlocksEndianess(VDIECONV_F2H, pImage->paBlocks, getImageBlocks(&pImage->Header));
870
871	if (uOpenFlags & VD_OPEN_FLAGS_DISCARD)
872	{
873	/*
874	* Create the back resolving table for discards.
875	* any error or inconsistency results in a fail because this might
876	* get us into trouble later on.
877	*/
878	pImage->paBlocksRev = (unsigned )RTMemAllocZ(sizeof(unsigned) getImageBlocks(&pImage->Header));
879	if (pImage->paBlocksRev)
880	{
881	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
882	unsigned cBlocks = getImageBlocks(&pImage->Header);
883
884	for (unsigned i = 0; i < cBlocks; i++)
885	pImage->paBlocksRev[i] = VDI_IMAGE_BLOCK_FREE;
886
887	for (unsigned i = 0; i < cBlocks; i++)
888	{
889	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
890	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
891	{
892	if (ptrBlock < cBlocksAllocated)
893	{
894	if (pImage->paBlocksRev[ptrBlock] == VDI_IMAGE_BLOCK_FREE)
895	pImage->paBlocksRev[ptrBlock] = i;
896	else
897	{
898	rc = VERR_VD_VDI_INVALID_HEADER;
899	break;
900	}
901	}
902	else
903	{
904	rc = VERR_VD_VDI_INVALID_HEADER;
905	break;
906	}
907	}
908	}
909	}
910	else
911	rc = VERR_NO_MEMORY;
912	}
913
914	out:
915	if (RT_FAILURE(rc))
916	vdiFreeImage(pImage, false);
917	return rc;
918	}
919
920	/**
921	* Internal: Save header to file.
922	*/
923	static int vdiUpdateHeader(PVDIIMAGEDESC pImage)
924	{
925	int rc;
926	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
927	{
928	case 0:
929	{
930	VDIHEADER0 Hdr;
931	vdiConvHeaderEndianessV0(VDIECONV_H2F, &Hdr, &pImage->Header.u.v0);
932	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VDIPREHEADER),
933	&Hdr, sizeof(Hdr), NULL);
934	break;
935	}
936	case 1:
937	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
938	{
939	VDIHEADER1 Hdr;
940	vdiConvHeaderEndianessV1(VDIECONV_H2F, &Hdr, &pImage->Header.u.v1);
941	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VDIPREHEADER),
942	&Hdr, sizeof(Hdr), NULL);
943	}
944	else
945	{
946	VDIHEADER1PLUS Hdr;
947	vdiConvHeaderEndianessV1p(VDIECONV_H2F, &Hdr, &pImage->Header.u.v1plus);
948	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VDIPREHEADER),
949	&Hdr, sizeof(Hdr), NULL);
950	}
951	break;
952	default:
953	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
954	break;
955	}
956	AssertMsgRC(rc, ("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
957	return rc;
958	}
959
960	/**
961	* Internal: Save header to file - async version.
962	*/
963	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
964	{
965	int rc;
966	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
967	{
968	case 0:
969	{
970	VDIHEADER0 Hdr;
971	vdiConvHeaderEndianessV0(VDIECONV_H2F, &Hdr, &pImage->Header.u.v0);
972	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
973	sizeof(VDIPREHEADER), &Hdr, sizeof(Hdr),
974	pIoCtx, NULL, NULL);
975	break;
976	}
977	case 1:
978	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
979	{
980	VDIHEADER1 Hdr;
981	vdiConvHeaderEndianessV1(VDIECONV_H2F, &Hdr, &pImage->Header.u.v1);
982	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
983	sizeof(VDIPREHEADER), &Hdr, sizeof(Hdr),
984	pIoCtx, NULL, NULL);
985	}
986	else
987	{
988	VDIHEADER1PLUS Hdr;
989	vdiConvHeaderEndianessV1p(VDIECONV_H2F, &Hdr, &pImage->Header.u.v1plus);
990	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
991	sizeof(VDIPREHEADER), &Hdr, sizeof(Hdr),
992	pIoCtx, NULL, NULL);
993	}
994	break;
995	default:
996	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
997	break;
998	}
999	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
1000	("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
1001	return rc;
1002	}
1003
1004	/**
1005	* Internal: Save block pointer to file, save header to file.
1006	*/
1007	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock)
1008	{
1009	/* Update image header. */
1010	int rc = vdiUpdateHeader(pImage);
1011	if (RT_SUCCESS(rc))
1012	{
1013	/* write only one block pointer. */
1014	VDIIMAGEBLOCKPOINTER ptrBlock = RT_H2LE_U32(pImage->paBlocks[uBlock]);
1015	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
1016	pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
1017	&ptrBlock, sizeof(VDIIMAGEBLOCKPOINTER),
1018	NULL);
1019	AssertMsgRC(rc, ("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
1020	uBlock, pImage->pszFilename, rc));
1021	}
1022	return rc;
1023	}
1024
1025	/**
1026	* Internal: Save block pointer to file, save header to file - async version.
1027	*/
1028	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock,
1029	PVDIOCTX pIoCtx, bool fUpdateHdr)
1030	{
1031	int rc = VINF_SUCCESS;
1032
1033	/* Update image header. */
1034	if (fUpdateHdr)
1035	rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
1036
1037	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1038	{
1039	/* write only one block pointer. */
1040	VDIIMAGEBLOCKPOINTER ptrBlock = RT_H2LE_U32(pImage->paBlocks[uBlock]);
1041	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
1042	pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
1043	&ptrBlock, sizeof(VDIIMAGEBLOCKPOINTER),
1044	pIoCtx, NULL, NULL);
1045	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
1046	("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
1047	uBlock, pImage->pszFilename, rc));
1048	}
1049	return rc;
1050	}
1051
1052	/**
1053	* Internal: Flush the image file to disk - async version.
1054	*/
1055	static int vdiFlushImageAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
1056	{
1057	int rc = VINF_SUCCESS;
1058
1059	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1060	{
1061	/* Save header. */
1062	rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
1063	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
1064	("vdiUpdateHeaderAsync() failed, filename=\"%s\", rc=%Rrc\n",
1065	pImage->pszFilename, rc));
1066	rc = vdIfIoIntFileFlushAsync(pImage->pIfIo, pImage->pStorage, pIoCtx, NULL, NULL);
1067	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
1068	("Flushing data to disk failed rc=%Rrc\n", rc));
1069	}
1070
1071	return rc;
1072	}
1073
1074	/**
1075	* Internal: Discard a whole block from the image filling the created hole with
1076	* data from another block.
1077	*
1078	* @returns VBox status code.
1079	* @param pImage VDI image instance data.
1080	* @param uBlock The block to discard.
1081	* @param pvBlock Memory to use for the I/O.
1082	*/
1083	static int vdiDiscardBlock(PVDIIMAGEDESC pImage, unsigned uBlock, void *pvBlock)
1084	{
1085	int rc = VINF_SUCCESS;
1086	uint64_t cbImage;
1087	unsigned idxLastBlock = getImageBlocksAllocated(&pImage->Header) - 1;
1088	unsigned uBlockLast = pImage->paBlocksRev[idxLastBlock];
1089	VDIIMAGEBLOCKPOINTER ptrBlockDiscard = pImage->paBlocks[uBlock];
1090
1091	LogFlowFunc(("pImage=%#p uBlock=%u pvBlock=%#p\n",
1092	pImage, uBlock, pvBlock));
1093
1094	pImage->paBlocksRev[idxLastBlock] = VDI_IMAGE_BLOCK_FREE;
1095
1096	do
1097	{
1098	/*
1099	* The block is empty, remove it.
1100	* Read the last block of the image first.
1101	*/
1102	if (idxLastBlock != ptrBlockDiscard)
1103	{
1104	uint64_t u64Offset;
1105
1106	LogFlowFunc(("Moving block [%u]=%u into [%u]=%u\n",
1107	uBlockLast, idxLastBlock, uBlock, pImage->paBlocks[uBlock]));
1108
1109	u64Offset = (uint64_t)idxLastBlock * pImage->cbTotalBlockData + pImage->offStartData;
1110	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset,
1111	pvBlock, pImage->cbTotalBlockData, NULL);
1112	if (RT_FAILURE(rc))
1113	break;
1114
1115	/* Write to the now unallocated block. */
1116	u64Offset = (uint64_t)ptrBlockDiscard * pImage->cbTotalBlockData + pImage->offStartData;
1117	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, u64Offset,
1118	pvBlock, pImage->cbTotalBlockData, NULL);
1119	if (RT_FAILURE(rc))
1120	break;
1121
1122	/* Update block and reverse block tables. */
1123	pImage->paBlocks[uBlockLast] = ptrBlockDiscard;
1124	pImage->paBlocksRev[ptrBlockDiscard] = uBlockLast;
1125	rc = vdiUpdateBlockInfo(pImage, uBlockLast);
1126	if (RT_FAILURE(rc))
1127	break;
1128	}
1129	else
1130	LogFlowFunc(("Discard last block [%u]=%u\n", uBlock, pImage->paBlocks[uBlock]));
1131
1132	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
1133
1134	/* Update the block pointers. */
1135	setImageBlocksAllocated(&pImage->Header, idxLastBlock);
1136	rc = vdiUpdateBlockInfo(pImage, uBlock);
1137	if (RT_FAILURE(rc))
1138	break;
1139
1140	pImage->cbImage -= pImage->cbTotalBlockData;
1141	LogFlowFunc(("Set new size %llu\n", pImage->cbImage));
1142	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->cbImage);
1143	} while (0);
1144
1145	LogFlowFunc(("returns rc=%Rrc\n", rc));
1146	return rc;
1147	}
1148
1149	/**
1150	* Completion callback for meta/userdata reads or writes.
1151	*
1152	* @return VBox status code.
1153	* VINF_SUCCESS if everything was successful and the transfer can continue.
1154	* VERR_VD_ASYNC_IO_IN_PROGRESS if there is another data transfer pending.
1155	* @param pBackendData The opaque backend data.
1156	* @param pIoCtx I/O context associated with this request.
1157	* @param pvUser Opaque user data passed during a read/write request.
1158	* @param rcReq Status code for the completed request.
1159	*/
1160	static DECLCALLBACK(int) vdiDiscardBlockAsyncUpdate(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
1161	{
1162	int rc = VINF_SUCCESS;
1163	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1164	PVDIBLOCKDISCARDASYNC pDiscardAsync = (PVDIBLOCKDISCARDASYNC)pvUser;
1165
1166	switch (pDiscardAsync->enmState)
1167	{
1168	case VDIBLOCKDISCARDSTATE_READ_BLOCK:
1169	{
1170	PVDMETAXFER pMetaXfer;
1171	uint64_t u64Offset = (uint64_t)pDiscardAsync->idxLastBlock * pImage->cbTotalBlockData + pImage->offStartData;
1172	rc = vdIfIoIntFileReadMetaAsync(pImage->pIfIo, pImage->pStorage, u64Offset,
1173	pDiscardAsync->pvBlock, pImage->cbTotalBlockData, pIoCtx,
1174	&pMetaXfer, vdiDiscardBlockAsyncUpdate, pDiscardAsync);
1175	if (RT_FAILURE(rc))
1176	break;
1177
1178	/* Release immediately and go to next step. */
1179	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
1180	pDiscardAsync->enmState = VDIBLOCKDISCARDSTATE_WRITE_BLOCK;
1181	}
1182	case VDIBLOCKDISCARDSTATE_WRITE_BLOCK:
1183	{
1184	/* Block read complete. Write to the new location (discarded block). */
1185	uint64_t u64Offset = (uint64_t)pDiscardAsync->ptrBlockDiscard * pImage->cbTotalBlockData + pImage->offStartData;
1186	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage, u64Offset,
1187	pDiscardAsync->pvBlock, pImage->cbTotalBlockData, pIoCtx,
1188	vdiDiscardBlockAsyncUpdate, pDiscardAsync);
1189
1190	pDiscardAsync->enmState = VDIBLOCKDISCARDSTATE_UPDATE_METADATA;
1191	if (RT_FAILURE(rc))
1192	break;
1193	}
1194	case VDIBLOCKDISCARDSTATE_UPDATE_METADATA:
1195	{
1196	int rc2;
1197	uint64_t cbImage;
1198
1199	/* Block write complete. Update metadata. */
1200	pImage->paBlocksRev[pDiscardAsync->idxLastBlock] = VDI_IMAGE_BLOCK_FREE;
1201	pImage->paBlocks[pDiscardAsync->uBlock] = VDI_IMAGE_BLOCK_ZERO;
1202
1203	if (pDiscardAsync->idxLastBlock != pDiscardAsync->ptrBlockDiscard)
1204	{
1205	pImage->paBlocks[pDiscardAsync->uBlockLast] = pDiscardAsync->ptrBlockDiscard;
1206	pImage->paBlocksRev[pDiscardAsync->ptrBlockDiscard] = pDiscardAsync->uBlockLast;
1207
1208	rc = vdiUpdateBlockInfoAsync(pImage, pDiscardAsync->uBlockLast, pIoCtx, false /* fUpdateHdr */);
1209	if ( RT_FAILURE(rc)
1210	&& rc != VERR_VD_ASYNC_IO_IN_PROGRESS)
1211	break;
1212	}
1213
1214	setImageBlocksAllocated(&pImage->Header, pDiscardAsync->idxLastBlock);
1215	rc = vdiUpdateBlockInfoAsync(pImage, pDiscardAsync->uBlock, pIoCtx, true /* fUpdateHdr */);
1216	if ( RT_FAILURE(rc)
1217	&& rc != VERR_VD_ASYNC_IO_IN_PROGRESS)
1218	break;
1219
1220	pImage->cbImage -= pImage->cbTotalBlockData;
1221	LogFlowFunc(("Set new size %llu\n", pImage->cbImage));
1222	rc2 = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->cbImage);
1223	if (RT_FAILURE(rc2))
1224	rc = rc2;
1225
1226	/* Free discard state. */
1227	RTMemFree(pDiscardAsync->pvBlock);
1228	RTMemFree(pDiscardAsync);
1229	break;
1230	}
1231	default:
1232	AssertMsgFailed(("Invalid state %d\n", pDiscardAsync->enmState));
1233	}
1234
1235	if (rc == VERR_VD_NOT_ENOUGH_METADATA)
1236	rc = VERR_VD_ASYNC_IO_IN_PROGRESS;
1237
1238	return rc;
1239	}
1240
1241	/**
1242	* Internal: Discard a whole block from the image filling the created hole with
1243	* data from another block - async I/O version.
1244	*
1245	* @returns VBox status code.
1246	* @param pImage VDI image instance data.
1247	* @param pIoCtx I/O context associated with this request.
1248	* @param uBlock The block to discard.
1249	* @param pvBlock Memory to use for the I/O.
1250	*/
1251	static int vdiDiscardBlockAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx,
1252	unsigned uBlock, void *pvBlock)
1253	{
1254	int rc = VINF_SUCCESS;
1255	PVDIBLOCKDISCARDASYNC pDiscardAsync = NULL;
1256
1257	LogFlowFunc(("pImage=%#p uBlock=%u pvBlock=%#p\n",
1258	pImage, uBlock, pvBlock));
1259
1260	pDiscardAsync = (PVDIBLOCKDISCARDASYNC)RTMemAllocZ(sizeof(VDIBLOCKDISCARDASYNC));
1261	if (RT_UNLIKELY(!pDiscardAsync))
1262	return VERR_NO_MEMORY;
1263
1264	/* Init block discard state. */
1265	pDiscardAsync->uBlock = uBlock;
1266	pDiscardAsync->pvBlock = pvBlock;
1267	pDiscardAsync->ptrBlockDiscard = pImage->paBlocks[uBlock];
1268	pDiscardAsync->idxLastBlock = getImageBlocksAllocated(&pImage->Header) - 1;
1269	pDiscardAsync->uBlockLast = pImage->paBlocksRev[pDiscardAsync->idxLastBlock];
1270
1271	/*
1272	* The block is empty, remove it.
1273	* Read the last block of the image first.
1274	*/
1275	if (pDiscardAsync->idxLastBlock != pDiscardAsync->ptrBlockDiscard)
1276	{
1277	LogFlowFunc(("Moving block [%u]=%u into [%u]=%u\n",
1278	pDiscardAsync->uBlockLast, pDiscardAsync->idxLastBlock,
1279	uBlock, pImage->paBlocks[uBlock]));
1280	pDiscardAsync->enmState = VDIBLOCKDISCARDSTATE_READ_BLOCK;
1281	}
1282	else
1283	{
1284	pDiscardAsync->enmState = VDIBLOCKDISCARDSTATE_UPDATE_METADATA; /* Start immediately to shrink the image. */
1285	LogFlowFunc(("Discard last block [%u]=%u\n", uBlock, pImage->paBlocks[uBlock]));
1286	}
1287
1288	/* Call the update callback directly. */
1289	rc = vdiDiscardBlockAsyncUpdate(pImage, pIoCtx, pDiscardAsync, VINF_SUCCESS);
1290
1291	LogFlowFunc(("returns rc=%Rrc\n", rc));
1292	return rc;
1293	}
1294
1295	/**
1296	* Internal: Creates a allocation bitmap from the given data.
1297	* Sectors which contain only 0 are marked as unallocated and sectors with
1298	* other data as allocated.
1299	*
1300	* @returns Pointer to the allocation bitmap or NULL on failure.
1301	* @param pvData The data to create the allocation bitmap for.
1302	* @param cbData Number of bytes in the buffer.
1303	*/
1304	static void vdiAllocationBitmapCreate(void pvData, size_t cbData)
1305	{
1306	unsigned cSectors = cbData / 512;
1307	unsigned uSectorCur = 0;
1308	void *pbmAllocationBitmap = NULL;
1309
1310	Assert(!(cbData % 512));
1311	Assert(!(cSectors % 8));
1312
1313	pbmAllocationBitmap = RTMemAllocZ(cSectors / 8);
1314	if (!pbmAllocationBitmap)
1315	return NULL;
1316
1317	while (uSectorCur < cSectors)
1318	{
1319	int idxSet = ASMBitFirstSet((uint8_t )pvData + uSectorCur 512, cbData * 8);
1320
1321	if (idxSet != -1)
1322	{
1323	unsigned idxSectorAlloc = idxSet / 8 / 512;
1324	ASMBitSet(pbmAllocationBitmap, uSectorCur + idxSectorAlloc);
1325
1326	uSectorCur += idxSectorAlloc + 1;
1327	cbData -= (idxSectorAlloc + 1) * 512;
1328	}
1329	else
1330	break;
1331	}
1332
1333	return pbmAllocationBitmap;
1334	}
1335
1336
1337	/**
1338	* Updates the state of the async cluster allocation.
1339	*
1340	* @returns VBox status code.
1341	* @param pBackendData The opaque backend data.
1342	* @param pIoCtx I/O context associated with this request.
1343	* @param pvUser Opaque user data passed during a read/write request.
1344	* @param rcReq Status code for the completed request.
1345	*/
1346	static DECLCALLBACK(int) vdiAsyncBlockAllocUpdate(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
1347	{
1348	int rc = VINF_SUCCESS;
1349	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1350	PVDIASYNCBLOCKALLOC pBlockAlloc = (PVDIASYNCBLOCKALLOC)pvUser;
1351
1352	if (RT_SUCCESS(rcReq))
1353	{
1354	pImage->cbImage += pImage->cbTotalBlockData;
1355	pImage->paBlocks[pBlockAlloc->uBlock] = pBlockAlloc->cBlocksAllocated;
1356
1357	if (pImage->paBlocksRev)
1358	pImage->paBlocksRev[pBlockAlloc->cBlocksAllocated] = pBlockAlloc->uBlock;
1359
1360	setImageBlocksAllocated(&pImage->Header, pBlockAlloc->cBlocksAllocated + 1);
1361	rc = vdiUpdateBlockInfoAsync(pImage, pBlockAlloc->uBlock, pIoCtx,
1362	true /* fUpdateHdr */);
1363	}
1364	/* else: I/O error don't update the block table. */
1365
1366	RTMemFree(pBlockAlloc);
1367	return rc;
1368	}
1369
1370	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
1371	static int vdiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1372	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
1373	{
1374	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
1375	int rc = VINF_SUCCESS;
1376	PVDIIMAGEDESC pImage;
1377
1378	if ( !VALID_PTR(pszFilename)
1379	\|\| !*pszFilename)
1380	{
1381	rc = VERR_INVALID_PARAMETER;
1382	goto out;
1383	}
1384
1385	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1386	if (!pImage)
1387	{
1388	rc = VERR_NO_MEMORY;
1389	goto out;
1390	}
1391	pImage->pszFilename = pszFilename;
1392	pImage->pStorage = NULL;
1393	pImage->paBlocks = NULL;
1394	pImage->pVDIfsDisk = pVDIfsDisk;
1395	pImage->pVDIfsImage = pVDIfsImage;
1396
1397	rc = vdiOpenImage(pImage, VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_READONLY);
1398	vdiFreeImage(pImage, false);
1399	RTMemFree(pImage);
1400
1401	if (RT_SUCCESS(rc))
1402	*penmType = VDTYPE_HDD;
1403
1404	out:
1405	LogFlowFunc(("returns %Rrc\n", rc));
1406	return rc;
1407	}
1408
1409	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1410	static int vdiOpen(const char *pszFilename, unsigned uOpenFlags,
1411	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1412	VDTYPE enmType, void **ppBackendData)
1413	{
1414	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
1415	int rc;
1416	PVDIIMAGEDESC pImage;
1417
1418	/* Check open flags. All valid flags are supported. */
1419	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1420	{
1421	rc = VERR_INVALID_PARAMETER;
1422	goto out;
1423	}
1424
1425	/* Check remaining arguments. */
1426	if ( !VALID_PTR(pszFilename)
1427	\|\| !*pszFilename)
1428	{
1429	rc = VERR_INVALID_PARAMETER;
1430	goto out;
1431	}
1432
1433	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1434	if (!pImage)
1435	{
1436	rc = VERR_NO_MEMORY;
1437	goto out;
1438	}
1439	pImage->pszFilename = pszFilename;
1440	pImage->pStorage = NULL;
1441	pImage->paBlocks = NULL;
1442	pImage->pVDIfsDisk = pVDIfsDisk;
1443	pImage->pVDIfsImage = pVDIfsImage;
1444
1445	rc = vdiOpenImage(pImage, uOpenFlags);
1446	if (RT_SUCCESS(rc))
1447	*ppBackendData = pImage;
1448	else
1449	RTMemFree(pImage);
1450
1451	out:
1452	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1453	return rc;
1454	}
1455
1456	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1457	static int vdiCreate(const char *pszFilename, uint64_t cbSize,
1458	unsigned uImageFlags, const char *pszComment,
1459	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1460	PCRTUUID pUuid, unsigned uOpenFlags,
1461	unsigned uPercentStart, unsigned uPercentSpan,
1462	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1463	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
1464	{
1465	LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p ppBackendData=%#p\n", pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
1466	int rc;
1467	PVDIIMAGEDESC pImage;
1468
1469	PFNVDPROGRESS pfnProgress = NULL;
1470	void *pvUser = NULL;
1471	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
1472	if (pIfProgress)
1473	{
1474	pfnProgress = pIfProgress->pfnProgress;
1475	pvUser = pIfProgress->Core.pvUser;
1476	}
1477
1478	/* Check the image flags. */
1479	if ((uImageFlags & ~VD_VDI_IMAGE_FLAGS_MASK) != 0)
1480	{
1481	rc = VERR_VD_INVALID_TYPE;
1482	goto out;
1483	}
1484
1485	/* Check open flags. All valid flags are supported. */
1486	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1487	{
1488	rc = VERR_INVALID_PARAMETER;
1489	goto out;
1490	}
1491
1492	/* Check size. Maximum 4PB-3M. No tricks with adjusting the 1M block size
1493	* so far, which would extend the size. */
1494	cbSize = RT_ALIGN_64(cbSize, _1M);
1495	if ( !cbSize
1496	\|\| cbSize >= _1P * 4 - _1M * 3)
1497	{
1498	rc = VERR_VD_INVALID_SIZE;
1499	goto out;
1500	}
1501
1502	/* Check remaining arguments. */
1503	if ( !VALID_PTR(pszFilename)
1504	\|\| !*pszFilename
1505	\|\| cbSize < VDI_IMAGE_DEFAULT_BLOCK_SIZE
1506	\|\| !VALID_PTR(pPCHSGeometry)
1507	\|\| !VALID_PTR(pLCHSGeometry))
1508	{
1509	rc = VERR_INVALID_PARAMETER;
1510	goto out;
1511	}
1512
1513	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1514	if (!pImage)
1515	{
1516	rc = VERR_NO_MEMORY;
1517	goto out;
1518	}
1519	pImage->pszFilename = pszFilename;
1520	pImage->pStorage = NULL;
1521	pImage->paBlocks = NULL;
1522	pImage->pVDIfsDisk = pVDIfsDisk;
1523	pImage->pVDIfsImage = pVDIfsImage;
1524
1525	rc = vdiCreateImage(pImage, cbSize, uImageFlags, pszComment,
1526	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1527	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1528	if (RT_SUCCESS(rc))
1529	{
1530	/* So far the image is opened in read/write mode. Make sure the
1531	* image is opened in read-only mode if the caller requested that. */
1532	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1533	{
1534	vdiFreeImage(pImage, false);
1535	rc = vdiOpenImage(pImage, uOpenFlags);
1536	if (RT_FAILURE(rc))
1537	{
1538	RTMemFree(pImage);
1539	goto out;
1540	}
1541	}
1542	*ppBackendData = pImage;
1543	}
1544	else
1545	RTMemFree(pImage);
1546
1547	out:
1548	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1549	return rc;
1550	}
1551
1552	/** @copydoc VBOXHDDBACKEND::pfnRename */
1553	static int vdiRename(void pBackendData, const char pszFilename)
1554	{
1555	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1556
1557	int rc = VINF_SUCCESS;
1558	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1559
1560	/* Check arguments. */
1561	if ( !pImage
1562	\|\| !pszFilename
1563	\|\| !*pszFilename)
1564	{
1565	rc = VERR_INVALID_PARAMETER;
1566	goto out;
1567	}
1568
1569	/* Close the image. */
1570	vdiFreeImage(pImage, false);
1571
1572	/* Rename the file. */
1573	rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
1574	if (RT_FAILURE(rc))
1575	{
1576	/* The move failed, try to reopen the original image. */
1577	int rc2 = vdiOpenImage(pImage, pImage->uOpenFlags);
1578	if (RT_FAILURE(rc2))
1579	rc = rc2;
1580
1581	goto out;
1582	}
1583
1584	/* Update pImage with the new information. */
1585	pImage->pszFilename = pszFilename;
1586
1587	/* Open the new image. */
1588	rc = vdiOpenImage(pImage, pImage->uOpenFlags);
1589	if (RT_FAILURE(rc))
1590	goto out;
1591
1592	out:
1593	LogFlowFunc(("returns %Rrc\n", rc));
1594	return rc;
1595	}
1596
1597	/** @copydoc VBOXHDDBACKEND::pfnClose */
1598	static int vdiClose(void *pBackendData, bool fDelete)
1599	{
1600	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1601	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1602	int rc;
1603
1604	rc = vdiFreeImage(pImage, fDelete);
1605	RTMemFree(pImage);
1606
1607	LogFlowFunc(("returns %Rrc\n", rc));
1608	return rc;
1609	}
1610
1611	/** @copydoc VBOXHDDBACKEND::pfnRead */
1612	static int vdiRead(void pBackendData, uint64_t uOffset, void pvBuf,
1613	size_t cbToRead, size_t *pcbActuallyRead)
1614	{
1615	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
1616	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1617	unsigned uBlock;
1618	unsigned offRead;
1619	int rc;
1620
1621	AssertPtr(pImage);
1622	Assert(!(uOffset % 512));
1623	Assert(!(cbToRead % 512));
1624
1625	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
1626	\|\| !VALID_PTR(pvBuf)
1627	\|\| !cbToRead)
1628	{
1629	rc = VERR_INVALID_PARAMETER;
1630	goto out;
1631	}
1632
1633	/* Calculate starting block number and offset inside it. */
1634	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1635	offRead = (unsigned)uOffset & pImage->uBlockMask;
1636
1637	/* Clip read range to at most the rest of the block. */
1638	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
1639	Assert(!(cbToRead % 512));
1640
1641	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
1642	rc = VERR_VD_BLOCK_FREE;
1643	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
1644	{
1645	memset(pvBuf, 0, cbToRead);
1646	rc = VINF_SUCCESS;
1647	}
1648	else
1649	{
1650	/* Block present in image file, read relevant data. */
1651	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1652	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
1653
1654	if (u64Offset + cbToRead <= pImage->cbImage)
1655	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset,
1656	pvBuf, cbToRead, NULL);
1657	else
1658	{
1659	LogRel(("VDI: Out of range access (%llu) in image %s, image size %llu\n",
1660	u64Offset, pImage->pszFilename, pImage->cbImage));
1661	memset(pvBuf, 0, cbToRead);
1662	rc = VERR_VD_READ_OUT_OF_RANGE;
1663	}
1664	}
1665
1666	if (pcbActuallyRead)
1667	*pcbActuallyRead = cbToRead;
1668
1669	out:
1670	LogFlowFunc(("returns %Rrc\n", rc));
1671	return rc;
1672	}
1673
1674	/*@copydoc VBOXHDDBACKEND::pfnWrite /
1675	static int vdiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
1676	size_t cbToWrite, size_t *pcbWriteProcess,
1677	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
1678	{
1679	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1680	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1681	unsigned uBlock;
1682	unsigned offWrite;
1683	int rc = VINF_SUCCESS;
1684
1685	AssertPtr(pImage);
1686	Assert(!(uOffset % 512));
1687	Assert(!(cbToWrite % 512));
1688
1689	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1690	{
1691	rc = VERR_VD_IMAGE_READ_ONLY;
1692	goto out;
1693	}
1694
1695	if (!VALID_PTR(pvBuf) \|\| !cbToWrite)
1696	{
1697	rc = VERR_INVALID_PARAMETER;
1698	goto out;
1699	}
1700
1701	/* No size check here, will do that later. For dynamic images which are
1702	* not multiples of the block size in length, this would prevent writing to
1703	* the last block. */
1704
1705	/* Calculate starting block number and offset inside it. */
1706	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1707	offWrite = (unsigned)uOffset & pImage->uBlockMask;
1708
1709	/* Clip write range to at most the rest of the block. */
1710	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
1711	Assert(!(cbToWrite % 512));
1712
1713	do
1714	{
1715	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
1716	{
1717	/* Block is either free or zero. */
1718	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
1719	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
1720	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
1721	{
1722	/* If the destination block is unallocated at this point, it's
1723	* either a zero block or a block which hasn't been used so far
1724	* (which also means that it's a zero block. Don't need to write
1725	* anything to this block if the data consists of just zeroes. */
1726	Assert(!(cbToWrite % 4));
1727	Assert(cbToWrite * 8 <= UINT32_MAX);
1728	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
1729	{
1730	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
1731	*pcbPreRead = 0;
1732	*pcbPostRead = 0;
1733	break;
1734	}
1735	}
1736
1737	if ( cbToWrite == getImageBlockSize(&pImage->Header)
1738	&& !(fWrite & VD_WRITE_NO_ALLOC))
1739	{
1740	/* Full block write to previously unallocated block.
1741	* Allocate block and write data. */
1742	Assert(!offWrite);
1743	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
1744	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
1745	+ (pImage->offStartData + pImage->offStartBlockData);
1746	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
1747	u64Offset, pvBuf, cbToWrite, NULL);
1748	if (RT_FAILURE(rc))
1749	goto out;
1750	pImage->paBlocks[uBlock] = cBlocksAllocated;
1751
1752	if (pImage->paBlocksRev)
1753	pImage->paBlocksRev[cBlocksAllocated] = uBlock;
1754
1755	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
1756
1757	rc = vdiUpdateBlockInfo(pImage, uBlock);
1758	if (RT_FAILURE(rc))
1759	goto out;
1760
1761	pImage->cbImage += cbToWrite;
1762	*pcbPreRead = 0;
1763	*pcbPostRead = 0;
1764	}
1765	else
1766	{
1767	/* Trying to do a partial write to an unallocated block. Don't do
1768	* anything except letting the upper layer know what to do. */
1769	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
1770	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
1771	rc = VERR_VD_BLOCK_FREE;
1772	}
1773	}
1774	else
1775	{
1776	/* Block present in image file, write relevant data. */
1777	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1778	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
1779	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, u64Offset,
1780	pvBuf, cbToWrite, NULL);
1781	}
1782	} while (0);
1783
1784	if (pcbWriteProcess)
1785	*pcbWriteProcess = cbToWrite;
1786
1787	out:
1788	LogFlowFunc(("returns %Rrc\n", rc));
1789	return rc;
1790	}
1791
1792	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1793	static int vdiFlush(void *pBackendData)
1794	{
1795	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1796	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1797	int rc = VINF_SUCCESS;
1798
1799	Assert(pImage);
1800
1801	vdiFlushImage(pImage);
1802	LogFlowFunc(("returns %Rrc\n", rc));
1803	return rc;
1804	}
1805
1806	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
1807	static unsigned vdiGetVersion(void *pBackendData)
1808	{
1809	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1810	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1811	unsigned uVersion;
1812
1813	AssertPtr(pImage);
1814
1815	if (pImage)
1816	uVersion = pImage->PreHeader.u32Version;
1817	else
1818	uVersion = 0;
1819
1820	LogFlowFunc(("returns %#x\n", uVersion));
1821	return uVersion;
1822	}
1823
1824	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
1825	static uint64_t vdiGetSize(void *pBackendData)
1826	{
1827	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1828	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1829	uint64_t cbSize;
1830
1831	AssertPtr(pImage);
1832
1833	if (pImage)
1834	cbSize = getImageDiskSize(&pImage->Header);
1835	else
1836	cbSize = 0;
1837
1838	LogFlowFunc(("returns %llu\n", cbSize));
1839	return cbSize;
1840	}
1841
1842	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
1843	static uint64_t vdiGetFileSize(void *pBackendData)
1844	{
1845	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1846	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1847	uint64_t cb = 0;
1848
1849	AssertPtr(pImage);
1850
1851	if (pImage)
1852	{
1853	uint64_t cbFile;
1854	if (pImage->pStorage)
1855	{
1856	int rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
1857	if (RT_SUCCESS(rc))
1858	cb += cbFile;
1859	}
1860	}
1861
1862	LogFlowFunc(("returns %lld\n", cb));
1863	return cb;
1864	}
1865
1866	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
1867	static int vdiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1868	{
1869	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1870	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1871	int rc;
1872
1873	AssertPtr(pImage);
1874
1875	if (pImage)
1876	{
1877	if (pImage->PCHSGeometry.cCylinders)
1878	{
1879	*pPCHSGeometry = pImage->PCHSGeometry;
1880	rc = VINF_SUCCESS;
1881	}
1882	else
1883	rc = VERR_VD_GEOMETRY_NOT_SET;
1884	}
1885	else
1886	rc = VERR_VD_NOT_OPENED;
1887
1888	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1889	return rc;
1890	}
1891
1892	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
1893	static int vdiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1894	{
1895	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1896	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1897	int rc;
1898
1899	AssertPtr(pImage);
1900
1901	if (pImage)
1902	{
1903	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1904	{
1905	rc = VERR_VD_IMAGE_READ_ONLY;
1906	goto out;
1907	}
1908
1909	pImage->PCHSGeometry = *pPCHSGeometry;
1910	rc = VINF_SUCCESS;
1911	}
1912	else
1913	rc = VERR_VD_NOT_OPENED;
1914
1915	out:
1916	LogFlowFunc(("returns %Rrc\n", rc));
1917	return rc;
1918	}
1919
1920	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
1921	static int vdiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1922	{
1923	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1924	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1925	int rc;
1926
1927	AssertPtr(pImage);
1928
1929	if (pImage)
1930	{
1931	VDIDISKGEOMETRY DummyGeo = { 0, 0, 0, VDI_GEOMETRY_SECTOR_SIZE };
1932	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
1933	if (!pGeometry)
1934	pGeometry = &DummyGeo;
1935
1936	if ( pGeometry->cCylinders > 0
1937	&& pGeometry->cHeads > 0
1938	&& pGeometry->cSectors > 0)
1939	{
1940	pLCHSGeometry->cCylinders = pGeometry->cCylinders;
1941	pLCHSGeometry->cHeads = pGeometry->cHeads;
1942	pLCHSGeometry->cSectors = pGeometry->cSectors;
1943	rc = VINF_SUCCESS;
1944	}
1945	else
1946	rc = VERR_VD_GEOMETRY_NOT_SET;
1947	}
1948	else
1949	rc = VERR_VD_NOT_OPENED;
1950
1951	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1952	return rc;
1953	}
1954
1955	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
1956	static int vdiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1957	{
1958	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1959	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1960	PVDIDISKGEOMETRY pGeometry;
1961	int rc;
1962
1963	AssertPtr(pImage);
1964
1965	if (pImage)
1966	{
1967	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1968	{
1969	rc = VERR_VD_IMAGE_READ_ONLY;
1970	goto out;
1971	}
1972
1973	pGeometry = getImageLCHSGeometry(&pImage->Header);
1974	if (pGeometry)
1975	{
1976	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
1977	pGeometry->cHeads = pLCHSGeometry->cHeads;
1978	pGeometry->cSectors = pLCHSGeometry->cSectors;
1979	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
1980
1981	/* Update header information in base image file. */
1982	vdiFlushImage(pImage);
1983	}
1984	rc = VINF_SUCCESS;
1985	}
1986	else
1987	rc = VERR_VD_NOT_OPENED;
1988
1989	out:
1990	LogFlowFunc(("returns %Rrc\n", rc));
1991	return rc;
1992	}
1993
1994	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
1995	static unsigned vdiGetImageFlags(void *pBackendData)
1996	{
1997	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1998	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1999	unsigned uImageFlags;
2000
2001	AssertPtr(pImage);
2002
2003	if (pImage)
2004	uImageFlags = pImage->uImageFlags;
2005	else
2006	uImageFlags = 0;
2007
2008	LogFlowFunc(("returns %#x\n", uImageFlags));
2009	return uImageFlags;
2010	}
2011
2012	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
2013	static unsigned vdiGetOpenFlags(void *pBackendData)
2014	{
2015	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2016	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2017	unsigned uOpenFlags;
2018
2019	AssertPtr(pImage);
2020
2021	if (pImage)
2022	uOpenFlags = pImage->uOpenFlags;
2023	else
2024	uOpenFlags = 0;
2025
2026	LogFlowFunc(("returns %#x\n", uOpenFlags));
2027	return uOpenFlags;
2028	}
2029
2030	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
2031	static int vdiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
2032	{
2033	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
2034	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2035	int rc;
2036	const char *pszFilename;
2037
2038	/* Image must be opened and the new flags must be valid. */
2039	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE \| VD_OPEN_FLAGS_SEQUENTIAL \| VD_OPEN_FLAGS_DISCARD)))
2040	{
2041	rc = VERR_INVALID_PARAMETER;
2042	goto out;
2043	}
2044
2045	/* Implement this operation via reopening the image. */
2046	pszFilename = pImage->pszFilename;
2047	rc = vdiFreeImage(pImage, false);
2048	if (RT_FAILURE(rc))
2049	goto out;
2050	rc = vdiOpenImage(pImage, uOpenFlags);
2051
2052	out:
2053	LogFlowFunc(("returns %Rrc\n", rc));
2054	return rc;
2055	}
2056
2057	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
2058	static int vdiGetComment(void pBackendData, char pszComment,
2059	size_t cbComment)
2060	{
2061	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
2062	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2063	int rc = VINF_SUCCESS;
2064
2065	AssertPtr(pImage);
2066
2067	if (pImage)
2068	{
2069	char *pszTmp = getImageComment(&pImage->Header);
2070	/* Make this foolproof even if the image doesn't have the zero
2071	* termination. With some luck the repaired header will be saved. */
2072	size_t cb = RTStrNLen(pszTmp, VDI_IMAGE_COMMENT_SIZE);
2073	if (cb == VDI_IMAGE_COMMENT_SIZE)
2074	{
2075	pszTmp[VDI_IMAGE_COMMENT_SIZE-1] = '\0';
2076	cb--;
2077	}
2078	if (cb < cbComment)
2079	{
2080	/* memcpy is much better than strncpy. */
2081	memcpy(pszComment, pszTmp, cb + 1);
2082	}
2083	else
2084	rc = VERR_BUFFER_OVERFLOW;
2085	}
2086	else
2087	rc = VERR_VD_NOT_OPENED;
2088
2089	LogFlowFunc(("returns %Rrc comment=\"%s\"\n", rc, pszComment));
2090	return rc;
2091	}
2092
2093	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
2094	static int vdiSetComment(void pBackendData, const char pszComment)
2095	{
2096	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
2097	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2098	int rc;
2099
2100	AssertPtr(pImage);
2101
2102	if (pImage)
2103	{
2104	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2105	rc = VERR_VD_IMAGE_READ_ONLY;
2106	else
2107	{
2108	size_t cchComment = pszComment ? strlen(pszComment) : 0;
2109	if (cchComment >= VDI_IMAGE_COMMENT_SIZE)
2110	{
2111	LogFunc(("pszComment is too long, %d bytes!\n", cchComment));
2112	rc = VERR_VD_VDI_COMMENT_TOO_LONG;
2113	goto out;
2114	}
2115
2116	/* we don't support old style images */
2117	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
2118	{
2119	/*
2120	* Update the comment field, making sure to zero out all of the previous comment.
2121	*/
2122	memset(pImage->Header.u.v1.szComment, '\0', VDI_IMAGE_COMMENT_SIZE);
2123	memcpy(pImage->Header.u.v1.szComment, pszComment, cchComment);
2124
2125	/* write out new the header */
2126	rc = vdiUpdateHeader(pImage);
2127	}
2128	else
2129	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
2130	}
2131	}
2132	else
2133	rc = VERR_VD_NOT_OPENED;
2134
2135	out:
2136	LogFlowFunc(("returns %Rrc\n", rc));
2137	return rc;
2138	}
2139
2140	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
2141	static int vdiGetUuid(void *pBackendData, PRTUUID pUuid)
2142	{
2143	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2144	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2145	int rc;
2146
2147	AssertPtr(pImage);
2148
2149	if (pImage)
2150	{
2151	pUuid = getImageCreationUUID(&pImage->Header);
2152	rc = VINF_SUCCESS;
2153	}
2154	else
2155	rc = VERR_VD_NOT_OPENED;
2156
2157	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2158	return rc;
2159	}
2160
2161	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
2162	static int vdiSetUuid(void *pBackendData, PCRTUUID pUuid)
2163	{
2164	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2165	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2166	int rc = VINF_SUCCESS;
2167
2168	AssertPtr(pImage);
2169
2170	if (pImage)
2171	{
2172	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2173	{
2174	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
2175	pImage->Header.u.v1.uuidCreate = *pUuid;
2176	/* Make it possible to clone old VDIs. */
2177	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
2178	pImage->Header.u.v0.uuidCreate = *pUuid;
2179	else
2180	{
2181	LogFunc(("Version is not supported!\n"));
2182	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
2183	}
2184	}
2185	else
2186	rc = VERR_VD_IMAGE_READ_ONLY;
2187	}
2188	else
2189	rc = VERR_VD_NOT_OPENED;
2190
2191	LogFlowFunc(("returns %Rrc\n", rc));
2192	return rc;
2193	}
2194
2195	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
2196	static int vdiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
2197	{
2198	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2199	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2200	int rc;
2201
2202	AssertPtr(pImage);
2203
2204	if (pImage)
2205	{
2206	pUuid = getImageModificationUUID(&pImage->Header);
2207	rc = VINF_SUCCESS;
2208	}
2209	else
2210	rc = VERR_VD_NOT_OPENED;
2211
2212	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2213	return rc;
2214	}
2215
2216	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
2217	static int vdiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
2218	{
2219	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2220	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2221	int rc = VINF_SUCCESS;
2222
2223	AssertPtr(pImage);
2224
2225	if (pImage)
2226	{
2227	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2228	{
2229	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
2230	pImage->Header.u.v1.uuidModify = *pUuid;
2231	/* Make it possible to clone old VDIs. */
2232	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
2233	pImage->Header.u.v0.uuidModify = *pUuid;
2234	else
2235	{
2236	LogFunc(("Version is not supported!\n"));
2237	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
2238	}
2239	}
2240	else
2241	rc = VERR_VD_IMAGE_READ_ONLY;
2242	}
2243	else
2244	rc = VERR_VD_NOT_OPENED;
2245
2246	LogFlowFunc(("returns %Rrc\n", rc));
2247	return rc;
2248	}
2249
2250	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
2251	static int vdiGetParentUuid(void *pBackendData, PRTUUID pUuid)
2252	{
2253	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2254	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2255	int rc;
2256
2257	AssertPtr(pImage);
2258
2259	if (pImage)
2260	{
2261	pUuid = getImageParentUUID(&pImage->Header);
2262	rc = VINF_SUCCESS;
2263	}
2264	else
2265	rc = VERR_VD_NOT_OPENED;
2266
2267	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2268	return rc;
2269	}
2270
2271	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
2272	static int vdiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
2273	{
2274	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2275	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2276	int rc = VINF_SUCCESS;
2277
2278	AssertPtr(pImage);
2279
2280	if (pImage)
2281	{
2282	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2283	{
2284	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
2285	pImage->Header.u.v1.uuidLinkage = *pUuid;
2286	/* Make it possible to clone old VDIs. */
2287	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
2288	pImage->Header.u.v0.uuidLinkage = *pUuid;
2289	else
2290	{
2291	LogFunc(("Version is not supported!\n"));
2292	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
2293	}
2294	}
2295	else
2296	rc = VERR_VD_IMAGE_READ_ONLY;
2297	}
2298	else
2299	rc = VERR_VD_NOT_OPENED;
2300
2301	LogFlowFunc(("returns %Rrc\n", rc));
2302	return rc;
2303	}
2304
2305	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
2306	static int vdiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
2307	{
2308	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2309	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2310	int rc;
2311
2312	AssertPtr(pImage);
2313
2314	if (pImage)
2315	{
2316	pUuid = getImageParentModificationUUID(&pImage->Header);
2317	rc = VINF_SUCCESS;
2318	}
2319	else
2320	rc = VERR_VD_NOT_OPENED;
2321
2322	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2323	return rc;
2324	}
2325
2326	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
2327	static int vdiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
2328	{
2329	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2330	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2331	int rc = VINF_SUCCESS;
2332
2333	AssertPtr(pImage);
2334
2335	if (pImage)
2336	{
2337	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2338	{
2339	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
2340	pImage->Header.u.v1.uuidParentModify = *pUuid;
2341	else
2342	{
2343	LogFunc(("Version is not supported!\n"));
2344	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
2345	}
2346	}
2347	else
2348	rc = VERR_VD_IMAGE_READ_ONLY;
2349	}
2350	else
2351	rc = VERR_VD_NOT_OPENED;
2352
2353	LogFlowFunc(("returns %Rrc\n", rc));
2354	return rc;
2355	}
2356
2357	/** @copydoc VBOXHDDBACKEND::pfnDump */
2358	static void vdiDump(void *pBackendData)
2359	{
2360	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2361
2362	vdIfErrorMessage(pImage->pIfError, "Dumping VDI image \"%s\" mode=%s uOpenFlags=%X File=%#p\n",
2363	pImage->pszFilename,
2364	(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) ? "r/o" : "r/w",
2365	pImage->uOpenFlags,
2366	pImage->pStorage);
2367	vdIfErrorMessage(pImage->pIfError, "Header: Version=%08X Type=%X Flags=%X Size=%llu\n",
2368	pImage->PreHeader.u32Version,
2369	getImageType(&pImage->Header),
2370	getImageFlags(&pImage->Header),
2371	getImageDiskSize(&pImage->Header));
2372	vdIfErrorMessage(pImage->pIfError, "Header: cbBlock=%u cbBlockExtra=%u cBlocks=%u cBlocksAllocated=%u\n",
2373	getImageBlockSize(&pImage->Header),
2374	getImageExtraBlockSize(&pImage->Header),
2375	getImageBlocks(&pImage->Header),
2376	getImageBlocksAllocated(&pImage->Header));
2377	vdIfErrorMessage(pImage->pIfError, "Header: offBlocks=%u offData=%u\n",
2378	getImageBlocksOffset(&pImage->Header),
2379	getImageDataOffset(&pImage->Header));
2380	PVDIDISKGEOMETRY pg = getImageLCHSGeometry(&pImage->Header);
2381	if (pg)
2382	vdIfErrorMessage(pImage->pIfError, "Header: Geometry: C/H/S=%u/%u/%u cbSector=%u\n",
2383	pg->cCylinders, pg->cHeads, pg->cSectors, pg->cbSector);
2384	vdIfErrorMessage(pImage->pIfError, "Header: uuidCreation={%RTuuid}\n", getImageCreationUUID(&pImage->Header));
2385	vdIfErrorMessage(pImage->pIfError, "Header: uuidModification={%RTuuid}\n", getImageModificationUUID(&pImage->Header));
2386	vdIfErrorMessage(pImage->pIfError, "Header: uuidParent={%RTuuid}\n", getImageParentUUID(&pImage->Header));
2387	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) >= 1)
2388	vdIfErrorMessage(pImage->pIfError, "Header: uuidParentModification={%RTuuid}\n", getImageParentModificationUUID(&pImage->Header));
2389	vdIfErrorMessage(pImage->pIfError, "Image: fFlags=%08X offStartBlocks=%u offStartData=%u\n",
2390	pImage->uImageFlags, pImage->offStartBlocks, pImage->offStartData);
2391	vdIfErrorMessage(pImage->pIfError, "Image: uBlockMask=%08X cbTotalBlockData=%u uShiftOffset2Index=%u offStartBlockData=%u\n",
2392	pImage->uBlockMask,
2393	pImage->cbTotalBlockData,
2394	pImage->uShiftOffset2Index,
2395	pImage->offStartBlockData);
2396
2397	unsigned uBlock, cBlocksNotFree, cBadBlocks, cBlocks = getImageBlocks(&pImage->Header);
2398	for (uBlock=0, cBlocksNotFree=0, cBadBlocks=0; uBlock<cBlocks; uBlock++)
2399	{
2400	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2401	{
2402	cBlocksNotFree++;
2403	if (pImage->paBlocks[uBlock] >= cBlocks)
2404	cBadBlocks++;
2405	}
2406	}
2407	if (cBlocksNotFree != getImageBlocksAllocated(&pImage->Header))
2408	{
2409	vdIfErrorMessage(pImage->pIfError, "!! WARNING: %u blocks actually allocated (cBlocksAllocated=%u) !!\n",
2410	cBlocksNotFree, getImageBlocksAllocated(&pImage->Header));
2411	}
2412	if (cBadBlocks)
2413	{
2414	vdIfErrorMessage(pImage->pIfError, "!! WARNING: %u bad blocks found !!\n",
2415	cBadBlocks);
2416	}
2417	}
2418
2419	static int vdiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
2420	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
2421	{
2422	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
2423	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
2424	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2425	unsigned uBlock;
2426	unsigned offRead;
2427	int rc;
2428
2429	AssertPtr(pImage);
2430	Assert(!(uOffset % 512));
2431	Assert(!(cbToRead % 512));
2432
2433	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
2434	\|\| !VALID_PTR(pIoCtx)
2435	\|\| !cbToRead)
2436	{
2437	rc = VERR_INVALID_PARAMETER;
2438	goto out;
2439	}
2440
2441	/* Calculate starting block number and offset inside it. */
2442	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2443	offRead = (unsigned)uOffset & pImage->uBlockMask;
2444
2445	/* Clip read range to at most the rest of the block. */
2446	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
2447	Assert(!(cbToRead % 512));
2448
2449	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
2450	rc = VERR_VD_BLOCK_FREE;
2451	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
2452	{
2453	size_t cbSet;
2454
2455	cbSet = vdIfIoIntIoCtxSet(pImage->pIfIo, pIoCtx, 0, cbToRead);
2456	Assert(cbSet == cbToRead);
2457
2458	rc = VINF_SUCCESS;
2459	}
2460	else
2461	{
2462	/* Block present in image file, read relevant data. */
2463	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2464	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
2465
2466	if (u64Offset + cbToRead <= pImage->cbImage)
2467	rc = vdIfIoIntFileReadUserAsync(pImage->pIfIo, pImage->pStorage, u64Offset,
2468	pIoCtx, cbToRead);
2469	else
2470	{
2471	LogRel(("VDI: Out of range access (%llu) in image %s, image size %llu\n",
2472	u64Offset, pImage->pszFilename, pImage->cbImage));
2473	vdIfIoIntIoCtxSet(pImage->pIfIo, pIoCtx, 0, cbToRead);
2474	rc = VERR_VD_READ_OUT_OF_RANGE;
2475	}
2476	}
2477
2478	if (pcbActuallyRead)
2479	*pcbActuallyRead = cbToRead;
2480
2481	out:
2482	LogFlowFunc(("returns %Rrc\n", rc));
2483	return rc;
2484	}
2485
2486	static int vdiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
2487	PVDIOCTX pIoCtx,
2488	size_t pcbWriteProcess, size_t pcbPreRead,
2489	size_t *pcbPostRead, unsigned fWrite)
2490	{
2491	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
2492	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2493	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2494	unsigned uBlock;
2495	unsigned offWrite;
2496	int rc = VINF_SUCCESS;
2497
2498	AssertPtr(pImage);
2499	Assert(!(uOffset % 512));
2500	Assert(!(cbToWrite % 512));
2501
2502	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2503	{
2504	rc = VERR_VD_IMAGE_READ_ONLY;
2505	goto out;
2506	}
2507
2508	if (!VALID_PTR(pIoCtx) \|\| !cbToWrite)
2509	{
2510	rc = VERR_INVALID_PARAMETER;
2511	goto out;
2512	}
2513
2514	/* No size check here, will do that later. For dynamic images which are
2515	* not multiples of the block size in length, this would prevent writing to
2516	* the last block. */
2517
2518	/* Calculate starting block number and offset inside it. */
2519	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2520	offWrite = (unsigned)uOffset & pImage->uBlockMask;
2521
2522	/* Clip write range to at most the rest of the block. */
2523	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
2524	Assert(!(cbToWrite % 512));
2525
2526	do
2527	{
2528	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2529	{
2530	/* Block is either free or zero. */
2531	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
2532	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
2533	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
2534	{
2535	#if 0 /** @todo Provide interface to check an I/O context for a specific value */
2536	/* If the destination block is unallocated at this point, it's
2537	* either a zero block or a block which hasn't been used so far
2538	* (which also means that it's a zero block. Don't need to write
2539	* anything to this block if the data consists of just zeroes. */
2540	Assert(!(cbToWrite % 4));
2541	Assert(cbToWrite * 8 <= UINT32_MAX);
2542	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
2543	{
2544	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
2545	break;
2546	}
2547	#endif
2548	}
2549
2550	if ( cbToWrite == getImageBlockSize(&pImage->Header)
2551	&& !(fWrite & VD_WRITE_NO_ALLOC))
2552	{
2553	/* Full block write to previously unallocated block.
2554	* Allocate block and write data. */
2555	Assert(!offWrite);
2556	PVDIASYNCBLOCKALLOC pBlockAlloc = (PVDIASYNCBLOCKALLOC)RTMemAllocZ(sizeof(VDIASYNCBLOCKALLOC));
2557	if (!pBlockAlloc)
2558	{
2559	rc = VERR_NO_MEMORY;
2560	break;
2561	}
2562
2563	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
2564	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
2565	+ (pImage->offStartData + pImage->offStartBlockData);
2566
2567	pBlockAlloc->cBlocksAllocated = cBlocksAllocated;
2568	pBlockAlloc->uBlock = uBlock;
2569
2570	*pcbPreRead = 0;
2571	*pcbPostRead = 0;
2572
2573	rc = vdIfIoIntFileWriteUserAsync(pImage->pIfIo, pImage->pStorage,
2574	u64Offset, pIoCtx, cbToWrite,
2575	vdiAsyncBlockAllocUpdate, pBlockAlloc);
2576	if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
2577	break;
2578	else if (RT_FAILURE(rc))
2579	{
2580	RTMemFree(pBlockAlloc);
2581	break;
2582	}
2583
2584	rc = vdiAsyncBlockAllocUpdate(pImage, pIoCtx, pBlockAlloc, rc);
2585	}
2586	else
2587	{
2588	/* Trying to do a partial write to an unallocated block. Don't do
2589	* anything except letting the upper layer know what to do. */
2590	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
2591	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
2592	rc = VERR_VD_BLOCK_FREE;
2593	}
2594	}
2595	else
2596	{
2597	/* Block present in image file, write relevant data. */
2598	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2599	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
2600	rc = vdIfIoIntFileWriteUserAsync(pImage->pIfIo, pImage->pStorage,
2601	u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2602	}
2603	} while (0);
2604
2605	if (pcbWriteProcess)
2606	*pcbWriteProcess = cbToWrite;
2607
2608	out:
2609	LogFlowFunc(("returns %Rrc\n", rc));
2610	return rc;
2611	}
2612
2613	static int vdiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
2614	{
2615	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2616	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2617	int rc = VINF_SUCCESS;
2618
2619	Assert(pImage);
2620
2621	rc = vdiFlushImageAsync(pImage, pIoCtx);
2622	LogFlowFunc(("returns %Rrc\n", rc));
2623	return rc;
2624	}
2625
2626	/** @copydoc VBOXHDDBACKEND::pfnCompact */
2627	static int vdiCompact(void *pBackendData, unsigned uPercentStart,
2628	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2629	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2630	{
2631	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2632	int rc = VINF_SUCCESS;
2633	void pvBuf = NULL, pvTmp = NULL;
2634	unsigned *paBlocks2 = NULL;
2635
2636	int (pfnParentRead)(void , uint64_t, void *, size_t) = NULL;
2637	void *pvParent = NULL;
2638	PVDINTERFACEPARENTSTATE pIfParentState = VDIfParentStateGet(pVDIfsOperation);
2639	if (pIfParentState)
2640	{
2641	pfnParentRead = pIfParentState->pfnParentRead;
2642	pvParent = pIfParentState->Core.pvUser;
2643	}
2644
2645	PFNVDPROGRESS pfnProgress = NULL;
2646	void *pvUser = NULL;
2647	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
2648
2649	PVDINTERFACEQUERYRANGEUSE pIfQueryRangeUse = VDIfQueryRangeUseGet(pVDIfsOperation);
2650
2651	do {
2652	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2653
2654	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2655	rc = VERR_VD_IMAGE_READ_ONLY);
2656
2657	unsigned cBlocks;
2658	unsigned cBlocksToMove = 0;
2659	size_t cbBlock;
2660	cBlocks = getImageBlocks(&pImage->Header);
2661	cbBlock = getImageBlockSize(&pImage->Header);
2662	if (pfnParentRead)
2663	{
2664	pvBuf = RTMemTmpAlloc(cbBlock);
2665	AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);
2666	}
2667	pvTmp = RTMemTmpAlloc(cbBlock);
2668	AssertBreakStmt(VALID_PTR(pvTmp), rc = VERR_NO_MEMORY);
2669
2670	uint64_t cbFile;
2671	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
2672	AssertRCBreak(rc);
2673	unsigned cBlocksAllocated = (unsigned)((cbFile - pImage->offStartData - pImage->offStartBlockData) >> pImage->uShiftOffset2Index);
2674	if (cBlocksAllocated == 0)
2675	{
2676	/* No data blocks in this image, no need to compact. */
2677	rc = VINF_SUCCESS;
2678	break;
2679	}
2680
2681	/* Allocate block array for back resolving. */
2682	paBlocks2 = (unsigned )RTMemAlloc(sizeof(unsigned ) * cBlocksAllocated);
2683	AssertBreakStmt(VALID_PTR(paBlocks2), rc = VERR_NO_MEMORY);
2684	/* Fill out back resolving, check/fix allocation errors before
2685	* compacting the image, just to be on the safe side. Update the
2686	* image contents straight away, as this enables cancelling. */
2687	for (unsigned i = 0; i < cBlocksAllocated; i++)
2688	paBlocks2[i] = VDI_IMAGE_BLOCK_FREE;
2689	rc = VINF_SUCCESS;
2690	for (unsigned i = 0; i < cBlocks; i++)
2691	{
2692	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2693	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2694	{
2695	if (ptrBlock < cBlocksAllocated)
2696	{
2697	if (paBlocks2[ptrBlock] == VDI_IMAGE_BLOCK_FREE)
2698	paBlocks2[ptrBlock] = i;
2699	else
2700	{
2701	LogFunc(("Freed cross-linked block %u in file \"%s\"\n",
2702	i, pImage->pszFilename));
2703	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2704	rc = vdiUpdateBlockInfo(pImage, i);
2705	if (RT_FAILURE(rc))
2706	break;
2707	}
2708	}
2709	else
2710	{
2711	LogFunc(("Freed out of bounds reference for block %u in file \"%s\"\n",
2712	i, pImage->pszFilename));
2713	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2714	rc = vdiUpdateBlockInfo(pImage, i);
2715	if (RT_FAILURE(rc))
2716	break;
2717	}
2718	}
2719	}
2720	if (RT_FAILURE(rc))
2721	break;
2722
2723	/* Find redundant information and update the block pointers
2724	* accordingly, creating bubbles. Keep disk up to date, as this
2725	* enables cancelling. */
2726	for (unsigned i = 0; i < cBlocks; i++)
2727	{
2728	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2729	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2730	{
2731	/* Block present in image file, read relevant data. */
2732	uint64_t u64Offset = (uint64_t)ptrBlock * pImage->cbTotalBlockData
2733	+ (pImage->offStartData + pImage->offStartBlockData);
2734	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset, pvTmp, cbBlock, NULL);
2735	if (RT_FAILURE(rc))
2736	break;
2737
2738	if (ASMBitFirstSet((volatile void )pvTmp, (uint32_t)cbBlock 8) == -1)
2739	{
2740	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_ZERO;
2741	rc = vdiUpdateBlockInfo(pImage, i);
2742	if (RT_FAILURE(rc))
2743	break;
2744	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2745	/* Adjust progress info, one block to be relocated. */
2746	cBlocksToMove++;
2747	}
2748	else if (pfnParentRead)
2749	{
2750	rc = pfnParentRead(pvParent, (uint64_t)i * cbBlock, pvBuf, cbBlock);
2751	if (RT_FAILURE(rc))
2752	break;
2753	if (!memcmp(pvTmp, pvBuf, cbBlock))
2754	{
2755	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2756	rc = vdiUpdateBlockInfo(pImage, i);
2757	if (RT_FAILURE(rc))
2758	break;
2759	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2760	/* Adjust progress info, one block to be relocated. */
2761	cBlocksToMove++;
2762	}
2763	}
2764	}
2765
2766	/* Check if the range is in use if the block is still allocated. */
2767	ptrBlock = pImage->paBlocks[i];
2768	if ( IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock)
2769	&& pIfQueryRangeUse)
2770	{
2771	bool fUsed = true;
2772
2773	rc = vdIfQueryRangeUse(pIfQueryRangeUse, (uint64_t)i * cbBlock, cbBlock, &fUsed);
2774	if (RT_FAILURE(rc))
2775	break;
2776	if (!fUsed)
2777	{
2778	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_ZERO;
2779	rc = vdiUpdateBlockInfo(pImage, i);
2780	if (RT_FAILURE(rc))
2781	break;
2782	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2783	/* Adjust progress info, one block to be relocated. */
2784	cBlocksToMove++;
2785	}
2786	}
2787
2788	if (pIfProgress && pIfProgress->pfnProgress)
2789	{
2790	rc = pIfProgress->pfnProgress(pIfProgress->Core.pvUser,
2791	(uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2792	if (RT_FAILURE(rc))
2793	break;
2794	}
2795	}
2796	if (RT_FAILURE(rc))
2797	break;
2798
2799	/* Fill bubbles with other data (if available). */
2800	unsigned cBlocksMoved = 0;
2801	unsigned uBlockUsedPos = cBlocksAllocated;
2802	for (unsigned i = 0; i < cBlocksAllocated; i++)
2803	{
2804	unsigned uBlock = paBlocks2[i];
2805	if (uBlock == VDI_IMAGE_BLOCK_FREE)
2806	{
2807	unsigned uBlockData = VDI_IMAGE_BLOCK_FREE;
2808	while (uBlockUsedPos > i && uBlockData == VDI_IMAGE_BLOCK_FREE)
2809	{
2810	uBlockUsedPos--;
2811	uBlockData = paBlocks2[uBlockUsedPos];
2812	}
2813	/* Terminate early if there is no block which needs copying. */
2814	if (uBlockUsedPos == i)
2815	break;
2816	uint64_t u64Offset = (uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2817	+ (pImage->offStartData + pImage->offStartBlockData);
2818	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset,
2819	pvTmp, cbBlock, NULL);
2820	u64Offset = (uint64_t)i * pImage->cbTotalBlockData
2821	+ (pImage->offStartData + pImage->offStartBlockData);
2822	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, u64Offset,
2823	pvTmp, cbBlock, NULL);
2824	pImage->paBlocks[uBlockData] = i;
2825	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated - cBlocksMoved);
2826	rc = vdiUpdateBlockInfo(pImage, uBlockData);
2827	if (RT_FAILURE(rc))
2828	break;
2829	paBlocks2[i] = uBlockData;
2830	paBlocks2[uBlockUsedPos] = VDI_IMAGE_BLOCK_FREE;
2831	cBlocksMoved++;
2832	}
2833
2834	if (pIfProgress && pIfProgress->pfnProgress)
2835	{
2836	rc = pIfProgress->pfnProgress(pIfProgress->Core.pvUser,
2837	(uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2838
2839	if (RT_FAILURE(rc))
2840	break;
2841	}
2842	}
2843	if (RT_FAILURE(rc))
2844	break;
2845
2846	/* Update image header. */
2847	setImageBlocksAllocated(&pImage->Header, uBlockUsedPos);
2848	vdiUpdateHeader(pImage);
2849
2850	/* Truncate the image to the proper size to finish compacting. */
2851	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
2852	(uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2853	+ pImage->offStartData + pImage->offStartBlockData);
2854	} while (0);
2855
2856	if (paBlocks2)
2857	RTMemTmpFree(paBlocks2);
2858	if (pvTmp)
2859	RTMemTmpFree(pvTmp);
2860	if (pvBuf)
2861	RTMemTmpFree(pvBuf);
2862
2863	if (RT_SUCCESS(rc) && pIfProgress && pIfProgress->pfnProgress)
2864	{
2865	pIfProgress->pfnProgress(pIfProgress->Core.pvUser,
2866	uPercentStart + uPercentSpan);
2867	}
2868
2869	LogFlowFunc(("returns %Rrc\n", rc));
2870	return rc;
2871	}
2872
2873
2874	/** @copydoc VBOXHDDBACKEND::pfnResize */
2875	static int vdiResize(void *pBackendData, uint64_t cbSize,
2876	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2877	unsigned uPercentStart, unsigned uPercentSpan,
2878	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2879	PVDINTERFACE pVDIfsOperation)
2880	{
2881	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2882	int rc = VINF_SUCCESS;
2883
2884	PFNVDPROGRESS pfnProgress = NULL;
2885	void *pvUser = NULL;
2886	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
2887
2888	/*
2889	* Making the image smaller is not supported at the moment.
2890	* Resizing is also not supported for fixed size images and
2891	* very old images.
2892	*/
2893	/** @todo implement making the image smaller, it is the responsibility of
2894	* the user to know what he's doing. */
2895	if ( cbSize < getImageDiskSize(&pImage->Header)
2896	\|\| GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0
2897	\|\| pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2898	rc = VERR_NOT_SUPPORTED;
2899	else if (cbSize > getImageDiskSize(&pImage->Header))
2900	{
2901	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header); /** < Blocks currently allocated, doesn't change during resize */
2902	uint32_t cBlocksNew = cbSize / getImageBlockSize(&pImage->Header); /** < New number of blocks in the image after the resize */
2903	if (cbSize % getImageBlockSize(&pImage->Header))
2904	cBlocksNew++;
2905
2906	uint32_t cBlocksOld = getImageBlocks(&pImage->Header); /** < Number of blocks before the resize. */
2907	uint64_t cbBlockspaceNew = cBlocksNew * sizeof(VDIIMAGEBLOCKPOINTER); /** < Required space for the block array after the resize. */
2908	uint64_t offStartDataNew = RT_ALIGN_32(pImage->offStartBlocks + cbBlockspaceNew, VDI_DATA_ALIGN); /** < New start offset for block data after the resize */
2909
2910	if ( pImage->offStartData != offStartDataNew
2911	&& cBlocksAllocated > 0)
2912	{
2913	/* Calculate how many sectors need to be relocated. */
2914	uint64_t cbOverlapping = offStartDataNew - pImage->offStartData;
2915	unsigned cBlocksReloc = cbOverlapping / getImageBlockSize(&pImage->Header);
2916	if (cbOverlapping % getImageBlockSize(&pImage->Header))
2917	cBlocksReloc++;
2918
2919	/* Since only full blocks can be relocated the new data start is
2920	* determined by moving it block by block. */
2921	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2922	offStartDataNew = pImage->offStartData;
2923
2924	/* Do the relocation. */
2925	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2926
2927	/*
2928	* Get the blocks we need to relocate first, they are appended to the end
2929	* of the image.
2930	*/
2931	void pvBuf = NULL, pvZero = NULL;
2932	do
2933	{
2934	VDIIMAGEBLOCKPOINTER uBlock = 0;
2935
2936	/* Allocate data buffer. */
2937	pvBuf = RTMemAllocZ(pImage->cbTotalBlockData);
2938	if (!pvBuf)
2939	{
2940	rc = VERR_NO_MEMORY;
2941	break;
2942	}
2943
2944	/* Allocate buffer for overwriting with zeroes. */
2945	pvZero = RTMemAllocZ(pImage->cbTotalBlockData);
2946	if (!pvZero)
2947	{
2948	rc = VERR_NO_MEMORY;
2949	break;
2950	}
2951
2952	for (unsigned i = 0; i < cBlocksReloc; i++)
2953	{
2954	/* Search the index in the block table. */
2955	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2956	{
2957	if (pImage->paBlocks[idxBlock] == uBlock)
2958	{
2959	/* Read data and append to the end of the image. */
2960	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2961	offStartDataNew, pvBuf,
2962	pImage->cbTotalBlockData, NULL);
2963	if (RT_FAILURE(rc))
2964	break;
2965
2966	uint64_t offBlockAppend;
2967	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &offBlockAppend);
2968	if (RT_FAILURE(rc))
2969	break;
2970
2971	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2972	offBlockAppend, pvBuf,
2973	pImage->cbTotalBlockData, NULL);
2974	if (RT_FAILURE(rc))
2975	break;
2976
2977	/* Zero out the old block area. */
2978	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2979	offStartDataNew, pvZero,
2980	pImage->cbTotalBlockData, NULL);
2981	if (RT_FAILURE(rc))
2982	break;
2983
2984	/* Update block counter. */
2985	pImage->paBlocks[idxBlock] = cBlocksAllocated - 1;
2986
2987	/*
2988	* Decrease the block number of all other entries in the array.
2989	* They were moved one block to the front.
2990	* Doing it as a separate step iterating over the array again
2991	* because an error while relocating the block might end up
2992	* in a corrupted image otherwise.
2993	*/
2994	for (unsigned idxBlock2 = 0; idxBlock2 < cBlocksOld; idxBlock2++)
2995	{
2996	if ( idxBlock2 != idxBlock
2997	&& IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[idxBlock2]))
2998	pImage->paBlocks[idxBlock2]--;
2999	}
3000
3001	/* Continue with the next block. */
3002	break;
3003	}
3004	}
3005
3006	if (RT_FAILURE(rc))
3007	break;
3008
3009	uBlock++;
3010	offStartDataNew += pImage->cbTotalBlockData;
3011	}
3012	} while (0);
3013
3014	if (pvBuf)
3015	RTMemFree(pvBuf);
3016	if (pvZero)
3017	RTMemFree(pvZero);
3018	}
3019
3020	/*
3021	* We need to update the new offsets for the image data in the out of memory
3022	* case too because we relocated the blocks already.
3023	*/
3024	pImage->offStartData = offStartDataNew;
3025	setImageDataOffset(&pImage->Header, offStartDataNew);
3026
3027	/*
3028	* Relocation done, expand the block array and update the header with
3029	* the new data.
3030	*/
3031	if (RT_SUCCESS(rc))
3032	{
3033	PVDIIMAGEBLOCKPOINTER paBlocksNew = (PVDIIMAGEBLOCKPOINTER)RTMemRealloc(pImage->paBlocks, cbBlockspaceNew);
3034	if (paBlocksNew)
3035	{
3036	pImage->paBlocks = paBlocksNew;
3037
3038	/* Mark the new blocks as unallocated. */
3039	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
3040	pImage->paBlocks[idxBlock] = VDI_IMAGE_BLOCK_FREE;
3041	}
3042	else
3043	rc = VERR_NO_MEMORY;
3044
3045	/* Write the block array before updating the rest. */
3046	vdiConvBlocksEndianess(VDIECONV_H2F, pImage->paBlocks, cBlocksNew);
3047	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->offStartBlocks,
3048	pImage->paBlocks, cbBlockspaceNew, NULL);
3049	vdiConvBlocksEndianess(VDIECONV_F2H, pImage->paBlocks, cBlocksNew);
3050
3051	if (RT_SUCCESS(rc))
3052	{
3053	/* Update size and new block count. */
3054	setImageDiskSize(&pImage->Header, cbSize);
3055	setImageBlocks(&pImage->Header, cBlocksNew);
3056	/* Update geometry. */
3057	pImage->PCHSGeometry = *pPCHSGeometry;
3058
3059	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
3060	if (pGeometry)
3061	{
3062	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
3063	pGeometry->cHeads = pLCHSGeometry->cHeads;
3064	pGeometry->cSectors = pLCHSGeometry->cSectors;
3065	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
3066	}
3067	}
3068	}
3069
3070	/* Update header information in base image file. */
3071	vdiFlushImage(pImage);
3072	}
3073	/* Same size doesn't change the image at all. */
3074
3075	LogFlowFunc(("returns %Rrc\n", rc));
3076	return rc;
3077	}
3078
3079
3080	/** @copydoc VBOXHDDBACKEND::pfnDiscard */
3081	static DECLCALLBACK(int) vdiDiscard(void *pBackendData,
3082	uint64_t uOffset, size_t cbDiscard,
3083	size_t *pcbPreAllocated,
3084	size_t *pcbPostAllocated,
3085	size_t *pcbActuallyDiscarded,
3086	void **ppbmAllocationBitmap,
3087	unsigned fDiscard)
3088	{
3089	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
3090	unsigned uBlock;
3091	unsigned offDiscard;
3092	int rc = VINF_SUCCESS;
3093	void *pvBlock = NULL;
3094
3095	LogFlowFunc(("pBackendData=%#p uOffset=%llu cbDiscard=%zu pcbPreAllocated=%#p pcbPostAllocated=%#p pcbActuallyDiscarded=%#p ppbmAllocationBitmap=%#p fDiscard=%#x\n",
3096	pBackendData, uOffset, cbDiscard, pcbPreAllocated, pcbPostAllocated, pcbActuallyDiscarded, ppbmAllocationBitmap, fDiscard));
3097
3098	AssertPtr(pImage);
3099	Assert(!(uOffset % 512));
3100	Assert(!(cbDiscard % 512));
3101
3102	AssertMsgReturn(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
3103	("Image is readonly\n"), VERR_VD_IMAGE_READ_ONLY);
3104	AssertMsgReturn( uOffset + cbDiscard <= getImageDiskSize(&pImage->Header)
3105	&& cbDiscard,
3106	("Invalid parameters uOffset=%llu cbDiscard=%zu\n",
3107	uOffset, cbDiscard),
3108	VERR_INVALID_PARAMETER);
3109
3110	do
3111	{
3112	AssertMsgBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
3113	("Image is opened readonly\n"),
3114	rc = VERR_VD_IMAGE_READ_ONLY);
3115
3116	AssertMsgBreakStmt(cbDiscard,
3117	("cbDiscard=%u\n", cbDiscard),
3118	rc = VERR_INVALID_PARAMETER);
3119
3120	/* Calculate starting block number and offset inside it. */
3121	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
3122	offDiscard = (unsigned)uOffset & pImage->uBlockMask;
3123
3124	/* Clip range to at most the rest of the block. */
3125	cbDiscard = RT_MIN(cbDiscard, getImageBlockSize(&pImage->Header) - offDiscard);
3126	Assert(!(cbDiscard % 512));
3127
3128	if (pcbPreAllocated)
3129	*pcbPreAllocated = 0;
3130
3131	if (pcbPostAllocated)
3132	*pcbPostAllocated = 0;
3133
3134	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
3135	{
3136	uint8_t *pbBlockData;
3137	size_t cbPreAllocated, cbPostAllocated;
3138
3139	cbPreAllocated = offDiscard % getImageBlockSize(&pImage->Header);
3140	cbPostAllocated = getImageBlockSize(&pImage->Header) - cbDiscard - cbPreAllocated;
3141
3142	/* Read the block data. */
3143	pvBlock = RTMemAlloc(pImage->cbTotalBlockData);
3144	if (!pvBlock)
3145	{
3146	rc = VERR_NO_MEMORY;
3147	break;
3148	}
3149
3150	if (!cbPreAllocated && !cbPostAllocated)
3151	{
3152	/*
3153	* Discarding a whole block, don't check for allocated sectors.
3154	* It is possible to just remove the whole block which avoids
3155	* one read and checking the whole block for data.
3156	*/
3157	rc = vdiDiscardBlock(pImage, uBlock, pvBlock);
3158	}
3159	else
3160	{
3161	/* Read data. */
3162	pbBlockData = (uint8_t *)pvBlock + pImage->offStartBlockData;
3163
3164	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData + pImage->offStartData;
3165	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset,
3166	pvBlock, pImage->cbTotalBlockData, NULL);
3167	if (RT_FAILURE(rc))
3168	break;
3169
3170	/* Clear data. */
3171	memset(pbBlockData + offDiscard , 0, cbDiscard);
3172
3173	Assert(!(cbDiscard % 4));
3174	Assert(cbDiscard * 8 <= UINT32_MAX);
3175	if (ASMBitFirstSet((volatile void )pbBlockData, getImageBlockSize(&pImage->Header) 8) == -1)
3176	rc = vdiDiscardBlock(pImage, uBlock, pvBlock);
3177	else if (fDiscard & VD_DISCARD_MARK_UNUSED)
3178	{
3179	/* Write changed data to the image. */
3180	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, u64Offset + offDiscard,
3181	pbBlockData + offDiscard, cbDiscard, NULL);
3182	}
3183	else
3184	{
3185	/* Block has data, create allocation bitmap. */
3186	*pcbPreAllocated = cbPreAllocated;
3187	*pcbPostAllocated = cbPostAllocated;
3188	*ppbmAllocationBitmap = vdiAllocationBitmapCreate(pbBlockData, getImageBlockSize(&pImage->Header));
3189	if (RT_UNLIKELY(!*ppbmAllocationBitmap))
3190	rc = VERR_NO_MEMORY;
3191	else
3192	rc = VERR_VD_DISCARD_ALIGNMENT_NOT_MET;
3193	}
3194	} /* if: no complete block discarded */
3195	} /* if: Block is allocated. */
3196	/* else: nothing to do. */
3197	} while (0);
3198
3199	if (pcbActuallyDiscarded)
3200	*pcbActuallyDiscarded = cbDiscard;
3201
3202	if (pvBlock)
3203	RTMemFree(pvBlock);
3204
3205	LogFlowFunc(("returns %Rrc\n", rc));
3206	return rc;
3207	}
3208
3209	/** @copydoc VBOXHDDBACKEND::pfnDiscard */
3210	static DECLCALLBACK(int) vdiAsyncDiscard(void *pBackendData, PVDIOCTX pIoCtx,
3211	uint64_t uOffset, size_t cbDiscard,
3212	size_t *pcbPreAllocated,
3213	size_t *pcbPostAllocated,
3214	size_t *pcbActuallyDiscarded,
3215	void **ppbmAllocationBitmap,
3216	unsigned fDiscard)
3217	{
3218	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
3219	unsigned uBlock;
3220	unsigned offDiscard;
3221	int rc = VINF_SUCCESS;
3222	void *pvBlock = NULL;
3223
3224	LogFlowFunc(("pBackendData=%#p pIoCtx=%#p uOffset=%llu cbDiscard=%zu pcbPreAllocated=%#p pcbPostAllocated=%#p pcbActuallyDiscarded=%#p ppbmAllocationBitmap=%#p fDiscard=%#x\n",
3225	pBackendData, pIoCtx, uOffset, cbDiscard, pcbPreAllocated, pcbPostAllocated, pcbActuallyDiscarded, ppbmAllocationBitmap, fDiscard));
3226
3227	AssertPtr(pImage);
3228	Assert(!(uOffset % 512));
3229	Assert(!(cbDiscard % 512));
3230
3231	AssertMsgReturn(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
3232	("Image is readonly\n"), VERR_VD_IMAGE_READ_ONLY);
3233	AssertMsgReturn( uOffset + cbDiscard <= getImageDiskSize(&pImage->Header)
3234	&& cbDiscard,
3235	("Invalid parameters uOffset=%llu cbDiscard=%zu\n",
3236	uOffset, cbDiscard),
3237	VERR_INVALID_PARAMETER);
3238
3239	do
3240	{
3241	AssertMsgBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
3242	("Image is opened readonly\n"),
3243	rc = VERR_VD_IMAGE_READ_ONLY);
3244
3245	AssertMsgBreakStmt(cbDiscard,
3246	("cbDiscard=%u\n", cbDiscard),
3247	rc = VERR_INVALID_PARAMETER);
3248
3249	/* Calculate starting block number and offset inside it. */
3250	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
3251	offDiscard = (unsigned)uOffset & pImage->uBlockMask;
3252
3253	/* Clip range to at most the rest of the block. */
3254	cbDiscard = RT_MIN(cbDiscard, getImageBlockSize(&pImage->Header) - offDiscard);
3255	Assert(!(cbDiscard % 512));
3256
3257	if (pcbPreAllocated)
3258	*pcbPreAllocated = 0;
3259
3260	if (pcbPostAllocated)
3261	*pcbPostAllocated = 0;
3262
3263	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
3264	{
3265	uint8_t *pbBlockData;
3266	size_t cbPreAllocated, cbPostAllocated;
3267
3268	cbPreAllocated = offDiscard % getImageBlockSize(&pImage->Header);
3269	cbPostAllocated = getImageBlockSize(&pImage->Header) - cbDiscard - cbPreAllocated;
3270
3271	/* Read the block data. */
3272	pvBlock = RTMemAlloc(pImage->cbTotalBlockData);
3273	if (!pvBlock)
3274	{
3275	rc = VERR_NO_MEMORY;
3276	break;
3277	}
3278
3279	if (!cbPreAllocated && !cbPostAllocated)
3280	{
3281	/*
3282	* Discarding a whole block, don't check for allocated sectors.
3283	* It is possible to just remove the whole block which avoids
3284	* one read and checking the whole block for data.
3285	*/
3286	rc = vdiDiscardBlockAsync(pImage, pIoCtx, uBlock, pvBlock);
3287	}
3288	else if (fDiscard & VD_DISCARD_MARK_UNUSED)
3289	{
3290	/* Just zero out the given range. */
3291	memset(pvBlock, 0, cbDiscard);
3292
3293	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData + pImage->offStartData + offDiscard;
3294	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
3295	u64Offset, pvBlock, cbDiscard, pIoCtx,
3296	NULL, NULL);
3297	RTMemFree(pvBlock);
3298	}
3299	else
3300	{
3301	/*
3302	* Read complete block as metadata, the I/O context has no memory buffer
3303	* and we need to access the content directly anyway.
3304	*/
3305	PVDMETAXFER pMetaXfer;
3306	pbBlockData = (uint8_t *)pvBlock + pImage->offStartBlockData;
3307
3308	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData + pImage->offStartData;
3309	rc = vdIfIoIntFileReadMetaAsync(pImage->pIfIo, pImage->pStorage, u64Offset,
3310	pbBlockData, pImage->cbTotalBlockData,
3311	pIoCtx, &pMetaXfer, NULL, NULL);
3312	if (RT_FAILURE(rc))
3313	break;
3314
3315	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
3316
3317	/* Clear data. */
3318	memset(pbBlockData + offDiscard , 0, cbDiscard);
3319
3320	Assert(!(cbDiscard % 4));
3321	Assert(getImageBlockSize(&pImage->Header) * 8 <= UINT32_MAX);
3322	if (ASMBitFirstSet((volatile void )pbBlockData, getImageBlockSize(&pImage->Header) 8) == -1)
3323	rc = vdiDiscardBlockAsync(pImage, pIoCtx, uBlock, pvBlock);
3324	else
3325	{
3326	/* Block has data, create allocation bitmap. */
3327	*pcbPreAllocated = cbPreAllocated;
3328	*pcbPostAllocated = cbPostAllocated;
3329	*ppbmAllocationBitmap = vdiAllocationBitmapCreate(pbBlockData, getImageBlockSize(&pImage->Header));
3330	if (RT_UNLIKELY(!*ppbmAllocationBitmap))
3331	rc = VERR_NO_MEMORY;
3332	else
3333	rc = VERR_VD_DISCARD_ALIGNMENT_NOT_MET;
3334
3335	RTMemFree(pvBlock);
3336	}
3337	} /* if: no complete block discarded */
3338	} /* if: Block is allocated. */
3339	/* else: nothing to do. */
3340	} while (0);
3341
3342	if (pcbActuallyDiscarded)
3343	*pcbActuallyDiscarded = cbDiscard;
3344
3345	LogFlowFunc(("returns %Rrc\n", rc));
3346	return rc;
3347	}
3348
3349	/** @copydoc VBOXHDDBACKEND::pfnRepair */
3350	static DECLCALLBACK(int) vdiRepair(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
3351	PVDINTERFACE pVDIfsImage, uint32_t fFlags)
3352	{
3353	LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
3354	int rc;
3355	PVDINTERFACEERROR pIfError;
3356	PVDINTERFACEIOINT pIfIo;
3357	PVDIOSTORAGE pStorage;
3358	uint64_t cbFile;
3359	PVDIIMAGEBLOCKPOINTER paBlocks = NULL;
3360	uint32_t *pu32BlockBitmap = NULL;
3361	VDIPREHEADER PreHdr;
3362	VDIHEADER Hdr;
3363
3364	pIfIo = VDIfIoIntGet(pVDIfsImage);
3365	AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
3366
3367	pIfError = VDIfErrorGet(pVDIfsDisk);
3368
3369	do
3370	{
3371	bool fRepairHdr = false;
3372	bool fRepairBlockArray = false;
3373
3374	rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
3375	VDOpenFlagsToFileOpenFlags( fFlags & VD_REPAIR_DRY_RUN
3376	? VD_OPEN_FLAGS_READONLY
3377	: 0,
3378	false /* fCreate */),
3379	&pStorage);
3380	if (RT_FAILURE(rc))
3381	{
3382	rc = vdIfError(pIfError, rc, RT_SRC_POS, "VDI: Failed to open image \"%s\"", pszFilename);
3383	break;
3384	}
3385
3386	rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
3387	if (RT_FAILURE(rc))
3388	{
3389	rc = vdIfError(pIfError, rc, RT_SRC_POS, "VDI: Failed to query image size");
3390	break;
3391	}
3392
3393	/* Read pre-header. */
3394	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &PreHdr, sizeof(PreHdr), NULL);
3395	if (RT_FAILURE(rc))
3396	{
3397	rc = vdIfError(pIfError, rc, RT_SRC_POS, N_("VDI: Error reading pre-header in '%s'"), pszFilename);
3398	break;
3399	}
3400	vdiConvPreHeaderEndianess(VDIECONV_F2H, &PreHdr, &PreHdr);
3401	rc = vdiValidatePreHeader(&PreHdr);
3402	if (RT_FAILURE(rc))
3403	{
3404	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3405	N_("VDI: invalid pre-header in '%s'"), pszFilename);
3406	break;
3407	}
3408
3409	/* Read header. */
3410	Hdr.uVersion = PreHdr.u32Version;
3411	switch (GET_MAJOR_HEADER_VERSION(&Hdr))
3412	{
3413	case 0:
3414	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, sizeof(PreHdr),
3415	&Hdr.u.v0, sizeof(Hdr.u.v0),
3416	NULL);
3417	if (RT_FAILURE(rc))
3418	rc = vdIfError(pIfError, rc, RT_SRC_POS, N_("VDI: error reading v0 header in '%s'"),
3419	pszFilename);
3420	vdiConvHeaderEndianessV0(VDIECONV_F2H, &Hdr.u.v0, &Hdr.u.v0);
3421	break;
3422	case 1:
3423	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, sizeof(PreHdr),
3424	&Hdr.u.v1, sizeof(Hdr.u.v1), NULL);
3425	if (RT_FAILURE(rc))
3426	{
3427	rc = vdIfError(pIfError, rc, RT_SRC_POS, N_("VDI: error reading v1 header in '%s'"),
3428	pszFilename);
3429	}
3430	vdiConvHeaderEndianessV1(VDIECONV_F2H, &Hdr.u.v1, &Hdr.u.v1);
3431	if (Hdr.u.v1.cbHeader >= sizeof(Hdr.u.v1plus))
3432	{
3433	/* Read the VDI 1.1+ header completely. */
3434	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, sizeof(PreHdr),
3435	&Hdr.u.v1plus, sizeof(Hdr.u.v1plus),
3436	NULL);
3437	if (RT_FAILURE(rc))
3438	rc = vdIfError(pIfError, rc, RT_SRC_POS, N_("VDI: error reading v1.1+ header in '%s'"),
3439	pszFilename);
3440	vdiConvHeaderEndianessV1p(VDIECONV_F2H, &Hdr.u.v1plus, &Hdr.u.v1plus);
3441	}
3442	break;
3443	default:
3444	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3445	N_("VDI: unsupported major version %u in '%s'"),
3446	GET_MAJOR_HEADER_VERSION(&Hdr), pszFilename);
3447	break;
3448	}
3449
3450	if (RT_SUCCESS(rc))
3451	{
3452	rc = vdiValidateHeader(&Hdr);
3453	if (RT_FAILURE(rc))
3454	{
3455	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3456	N_("VDI: invalid header in '%s'"), pszFilename);
3457	break;
3458	}
3459	}
3460
3461	/* Setup image parameters by header. */
3462	uint64_t offStartBlocks, offStartData;
3463	size_t cbTotalBlockData;
3464
3465	offStartBlocks = getImageBlocksOffset(&Hdr);
3466	offStartData = getImageDataOffset(&Hdr);
3467	cbTotalBlockData = getImageExtraBlockSize(&Hdr) + getImageBlockSize(&Hdr);
3468
3469	/* Allocate memory for blocks array. */
3470	paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&Hdr));
3471	if (!paBlocks)
3472	{
3473	rc = vdIfError(pIfError, VERR_NO_MEMORY, RT_SRC_POS,
3474	"Failed to allocate memory for block array");
3475	break;
3476	}
3477
3478	/* Read blocks array. */
3479	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offStartBlocks, paBlocks,
3480	getImageBlocks(&Hdr) * sizeof(VDIIMAGEBLOCKPOINTER),
3481	NULL);
3482	if (RT_FAILURE(rc))
3483	{
3484	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3485	"Failed to read block array (at %llu), %Rrc",
3486	offStartBlocks, rc);
3487	break;
3488	}
3489	vdiConvBlocksEndianess(VDIECONV_F2H, paBlocks, getImageBlocks(&Hdr));
3490
3491	pu32BlockBitmap = (uint32_t *)RTMemAllocZ(RT_ALIGN_Z(getImageBlocks(&Hdr) / 8, 4));
3492	if (!pu32BlockBitmap)
3493	{
3494	rc = vdIfError(pIfError, VERR_NO_MEMORY, RT_SRC_POS,
3495	"Failed to allocate memory for block bitmap");
3496	break;
3497	}
3498
3499	for (uint32_t i = 0; i < getImageBlocks(&Hdr); i++)
3500	{
3501	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(paBlocks[i]))
3502	{
3503	uint64_t offBlock = (uint64_t)paBlocks[i] * cbTotalBlockData
3504	+ offStartData;
3505
3506	/*
3507	* Check that the offsets are valid (inside of the image) and
3508	* that there are no double references.
3509	*/
3510	if (offBlock + cbTotalBlockData > cbFile)
3511	{
3512	vdIfErrorMessage(pIfError, "Entry %u points to invalid offset %llu, clearing\n",
3513	i, offBlock);
3514	paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
3515	fRepairBlockArray = true;
3516	}
3517	else if (ASMBitTestAndSet(pu32BlockBitmap, paBlocks[i]))
3518	{
3519	vdIfErrorMessage(pIfError, "Entry %u points to an already referenced data block, clearing\n",
3520	i);
3521	paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
3522	fRepairBlockArray = true;
3523	}
3524	}
3525	}
3526
3527	/* Write repaired structures now. */
3528	if (!fRepairBlockArray)
3529	vdIfErrorMessage(pIfError, "VDI image is in a consistent state, no repair required\n");
3530	else if (!(fFlags & VD_REPAIR_DRY_RUN))
3531	{
3532	vdIfErrorMessage(pIfError, "Writing repaired block allocation table...\n");
3533
3534	vdiConvBlocksEndianess(VDIECONV_H2F, paBlocks, getImageBlocks(&Hdr));
3535	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offStartBlocks, paBlocks,
3536	getImageBlocks(&Hdr) * sizeof(VDIIMAGEBLOCKPOINTER),
3537	NULL);
3538	if (RT_FAILURE(rc))
3539	{
3540	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3541	"Could not write repaired block allocation table (at %llu), %Rrc",
3542	offStartBlocks, rc);
3543	break;
3544	}
3545	}
3546
3547	vdIfErrorMessage(pIfError, "Corrupted VDI image repaired successfully\n");
3548	} while(0);
3549
3550	if (paBlocks)
3551	RTMemFree(paBlocks);
3552
3553	if (pu32BlockBitmap)
3554	RTMemFree(pu32BlockBitmap);
3555
3556	if (pStorage)
3557	vdIfIoIntFileClose(pIfIo, pStorage);
3558
3559	LogFlowFunc(("returns %Rrc\n", rc));
3560	return rc;
3561	}
3562
3563	VBOXHDDBACKEND g_VDIBackend =
3564	{
3565	/* pszBackendName */
3566	"VDI",
3567	/* cbSize */
3568	sizeof(VBOXHDDBACKEND),
3569	/* uBackendCaps */
3570	VD_CAP_UUID \| VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC
3571	\| VD_CAP_DIFF \| VD_CAP_FILE \| VD_CAP_ASYNC \| VD_CAP_VFS \| VD_CAP_DISCARD,
3572	/* paFileExtensions */
3573	s_aVdiFileExtensions,
3574	/* paConfigInfo */
3575	NULL,
3576	/* hPlugin */
3577	NIL_RTLDRMOD,
3578	/* pfnCheckIfValid */
3579	vdiCheckIfValid,
3580	/* pfnOpen */
3581	vdiOpen,
3582	/* pfnCreate */
3583	vdiCreate,
3584	/* pfnRename */
3585	vdiRename,
3586	/* pfnClose */
3587	vdiClose,
3588	/* pfnRead */
3589	vdiRead,
3590	/* pfnWrite */
3591	vdiWrite,
3592	/* pfnFlush */
3593	vdiFlush,
3594	/* pfnGetVersion */
3595	vdiGetVersion,
3596	/* pfnGetSize */
3597	vdiGetSize,
3598	/* pfnGetFileSize */
3599	vdiGetFileSize,
3600	/* pfnGetPCHSGeometry */
3601	vdiGetPCHSGeometry,
3602	/* pfnSetPCHSGeometry */
3603	vdiSetPCHSGeometry,
3604	/* pfnGetLCHSGeometry */
3605	vdiGetLCHSGeometry,
3606	/* pfnSetLCHSGeometry */
3607	vdiSetLCHSGeometry,
3608	/* pfnGetImageFlags */
3609	vdiGetImageFlags,
3610	/* pfnGetOpenFlags */
3611	vdiGetOpenFlags,
3612	/* pfnSetOpenFlags */
3613	vdiSetOpenFlags,
3614	/* pfnGetComment */
3615	vdiGetComment,
3616	/* pfnSetComment */
3617	vdiSetComment,
3618	/* pfnGetUuid */
3619	vdiGetUuid,
3620	/* pfnSetUuid */
3621	vdiSetUuid,
3622	/* pfnGetModificationUuid */
3623	vdiGetModificationUuid,
3624	/* pfnSetModificationUuid */
3625	vdiSetModificationUuid,
3626	/* pfnGetParentUuid */
3627	vdiGetParentUuid,
3628	/* pfnSetParentUuid */
3629	vdiSetParentUuid,
3630	/* pfnGetParentModificationUuid */
3631	vdiGetParentModificationUuid,
3632	/* pfnSetParentModificationUuid */
3633	vdiSetParentModificationUuid,
3634	/* pfnDump */
3635	vdiDump,
3636	/* pfnGetTimeStamp */
3637	NULL,
3638	/* pfnGetParentTimeStamp */
3639	NULL,
3640	/* pfnSetParentTimeStamp */
3641	NULL,
3642	/* pfnGetParentFilename */
3643	NULL,
3644	/* pfnSetParentFilename */
3645	NULL,
3646	/* pfnAsyncRead */
3647	vdiAsyncRead,
3648	/* pfnAsyncWrite */
3649	vdiAsyncWrite,
3650	/* pfnAsyncFlush */
3651	vdiAsyncFlush,
3652	/* pfnComposeLocation */
3653	genericFileComposeLocation,
3654	/* pfnComposeName */
3655	genericFileComposeName,
3656	/* pfnCompact */
3657	vdiCompact,
3658	/* pfnResize */
3659	vdiResize,
3660	/* pfnDiscard */
3661	vdiDiscard,
3662	/* pfnAsyncDiscard */
3663	vdiAsyncDiscard,
3664	/* pfnRepair */
3665	vdiRepair
3666	};

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source: vbox/trunk/src/VBox/Storage/VDI.cpp@ 41661

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