VDI.cpp@ 37423

Last change on this file since 37423 was 37246, checked in by vboxsync, 14 years ago
Storage/VMDK+VDI: fix error handling when pointing to a zero size file
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 95.4 KB

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1	/** @file
2	* Virtual Disk Image (VDI), Core Code.
3	*/
4
5	/*
6	* Copyright (C) 2006-2011 Oracle Corporation
7	*
8	* This file is part of VirtualBox Open Source Edition (OSE), as
9	* available from http://www.virtualbox.org. This file is free software;
10	* you can redistribute it and/or modify it under the terms of the GNU
11	* General Public License (GPL) as published by the Free Software
12	* Foundation, in version 2 as it comes in the "COPYING" file of the
13	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	*/
16
17	/*******************************************************************************
18	* Header Files *
19	*******************************************************************************/
20	#define LOG_GROUP LOG_GROUP_VD_VDI
21	#include <VBox/vd-plugin.h>
22	#define VBOX_VDICORE_VD /* Signal that the header is included from here. */
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	/*******************************************************************************
36	* Static Variables *
37	*******************************************************************************/
38
39	/** NULL-terminated array of supported file extensions. */
40	static const VDFILEEXTENSION s_aVdiFileExtensions[] =
41	{
42	{"vdi", VDTYPE_HDD},
43	{NULL, VDTYPE_INVALID}
44	};
45
46	/*******************************************************************************
47	* Internal Functions *
48	*******************************************************************************/
49	static unsigned getPowerOfTwo(unsigned uNumber);
50	static void vdiInitPreHeader(PVDIPREHEADER pPreHdr);
51	static int vdiValidatePreHeader(PVDIPREHEADER pPreHdr);
52	static void vdiInitHeader(PVDIHEADER pHeader, uint32_t uImageFlags,
53	const char *pszComment, uint64_t cbDisk,
54	uint32_t cbBlock, uint32_t cbBlockExtra);
55	static int vdiValidateHeader(PVDIHEADER pHeader);
56	static void vdiSetupImageDesc(PVDIIMAGEDESC pImage);
57	static int vdiUpdateHeader(PVDIIMAGEDESC pImage);
58	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock);
59	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx);
60	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock, PVDIOCTX pIoCtx);
61
62	/**
63	* Internal: signal an error to the frontend.
64	*/
65	DECLINLINE(int) vdiError(PVDIIMAGEDESC pImage, int rc, RT_SRC_POS_DECL,
66	const char *pszFormat, ...)
67	{
68	va_list va;
69	va_start(va, pszFormat);
70	if (pImage->pInterfaceError && pImage->pInterfaceErrorCallbacks)
71	pImage->pInterfaceErrorCallbacks->pfnError(pImage->pInterfaceError->pvUser,
72	rc, RT_SRC_POS_ARGS,
73	pszFormat, va);
74	va_end(va);
75	return rc;
76	}
77
78	/**
79	* Internal: signal an informational message to the frontend.
80	*/
81	DECLINLINE(int) vdiMessage(PVDIIMAGEDESC pImage, const char *pszFormat, ...)
82	{
83	int rc = VINF_SUCCESS;
84	va_list va;
85	va_start(va, pszFormat);
86	if (pImage->pInterfaceError && pImage->pInterfaceErrorCallbacks)
87	rc = pImage->pInterfaceErrorCallbacks->pfnMessage(pImage->pInterfaceError->pvUser,
88	pszFormat, va);
89	va_end(va);
90	return rc;
91	}
92
93
94	DECLINLINE(int) vdiFileOpen(PVDIIMAGEDESC pImage, const char *pszFilename,
95	uint32_t fOpen)
96	{
97	return pImage->pInterfaceIOCallbacks->pfnOpen(pImage->pInterfaceIO->pvUser,
98	pszFilename, fOpen,
99	&pImage->pStorage);
100	}
101
102	DECLINLINE(int) vdiFileClose(PVDIIMAGEDESC pImage)
103	{
104	return pImage->pInterfaceIOCallbacks->pfnClose(pImage->pInterfaceIO->pvUser,
105	pImage->pStorage);
106	}
107
108	DECLINLINE(int) vdiFileDelete(PVDIIMAGEDESC pImage, const char *pszFilename)
109	{
110	return pImage->pInterfaceIOCallbacks->pfnDelete(pImage->pInterfaceIO->pvUser,
111	pszFilename);
112	}
113
114	DECLINLINE(int) vdiFileMove(PVDIIMAGEDESC pImage, const char *pszSrc,
115	const char *pszDst, unsigned fMove)
116	{
117	return pImage->pInterfaceIOCallbacks->pfnMove(pImage->pInterfaceIO->pvUser,
118	pszSrc, pszDst, fMove);
119	}
120
121	DECLINLINE(int) vdiFileGetFreeSpace(PVDIIMAGEDESC pImage, const char *pszFilename,
122	int64_t *pcbFree)
123	{
124	return pImage->pInterfaceIOCallbacks->pfnGetFreeSpace(pImage->pInterfaceIO->pvUser,
125	pszFilename, pcbFree);
126	}
127
128	DECLINLINE(int) vdiFileGetSize(PVDIIMAGEDESC pImage, uint64_t *pcbSize)
129	{
130	return pImage->pInterfaceIOCallbacks->pfnGetSize(pImage->pInterfaceIO->pvUser,
131	pImage->pStorage, pcbSize);
132	}
133
134	DECLINLINE(int) vdiFileSetSize(PVDIIMAGEDESC pImage, uint64_t cbSize)
135	{
136	return pImage->pInterfaceIOCallbacks->pfnSetSize(pImage->pInterfaceIO->pvUser,
137	pImage->pStorage, cbSize);
138	}
139
140	DECLINLINE(int) vdiFileWriteSync(PVDIIMAGEDESC pImage, uint64_t uOffset,
141	const void *pvBuffer, size_t cbBuffer,
142	size_t *pcbWritten)
143	{
144	return pImage->pInterfaceIOCallbacks->pfnWriteSync(pImage->pInterfaceIO->pvUser,
145	pImage->pStorage, uOffset,
146	pvBuffer, cbBuffer, pcbWritten);
147	}
148
149	DECLINLINE(int) vdiFileReadSync(PVDIIMAGEDESC pImage, uint64_t uOffset,
150	void pvBuffer, size_t cbBuffer, size_t pcbRead)
151	{
152	return pImage->pInterfaceIOCallbacks->pfnReadSync(pImage->pInterfaceIO->pvUser,
153	pImage->pStorage, uOffset,
154	pvBuffer, cbBuffer, pcbRead);
155	}
156
157	DECLINLINE(int) vdiFileFlushSync(PVDIIMAGEDESC pImage)
158	{
159	return pImage->pInterfaceIOCallbacks->pfnFlushSync(pImage->pInterfaceIO->pvUser,
160	pImage->pStorage);
161	}
162
163	DECLINLINE(int) vdiFileReadUserAsync(PVDIIMAGEDESC pImage, uint64_t uOffset,
164	PVDIOCTX pIoCtx, size_t cbRead)
165	{
166	return pImage->pInterfaceIOCallbacks->pfnReadUserAsync(pImage->pInterfaceIO->pvUser,
167	pImage->pStorage,
168	uOffset, pIoCtx,
169	cbRead);
170	}
171
172	DECLINLINE(int) vdiFileWriteUserAsync(PVDIIMAGEDESC pImage, uint64_t uOffset,
173	PVDIOCTX pIoCtx, size_t cbWrite,
174	PFNVDXFERCOMPLETED pfnComplete,
175	void *pvCompleteUser)
176	{
177	return pImage->pInterfaceIOCallbacks->pfnWriteUserAsync(pImage->pInterfaceIO->pvUser,
178	pImage->pStorage,
179	uOffset, pIoCtx,
180	cbWrite,
181	pfnComplete,
182	pvCompleteUser);
183	}
184
185	DECLINLINE(int) vdiFileWriteMetaAsync(PVDIIMAGEDESC pImage, uint64_t uOffset,
186	void *pvBuffer, size_t cbBuffer,
187	PVDIOCTX pIoCtx,
188	PFNVDXFERCOMPLETED pfnComplete,
189	void *pvCompleteUser)
190	{
191	return pImage->pInterfaceIOCallbacks->pfnWriteMetaAsync(pImage->pInterfaceIO->pvUser,
192	pImage->pStorage,
193	uOffset, pvBuffer,
194	cbBuffer, pIoCtx,
195	pfnComplete,
196	pvCompleteUser);
197	}
198
199	DECLINLINE(int) vdiFileFlushAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx,
200	PFNVDXFERCOMPLETED pfnComplete,
201	void *pvCompleteUser)
202	{
203	return pImage->pInterfaceIOCallbacks->pfnFlushAsync(pImage->pInterfaceIO->pvUser,
204	pImage->pStorage,
205	pIoCtx, pfnComplete,
206	pvCompleteUser);
207	}
208
209	DECLINLINE(size_t) vdiFileIoCtxSet(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx,
210	int ch, size_t cbSet)
211	{
212	return pImage->pInterfaceIOCallbacks->pfnIoCtxSet(pImage->pInterfaceIO->pvUser,
213	pIoCtx, ch, cbSet);
214	}
215
216
217	/**
218	* Internal: Flush the image file to disk.
219	*/
220	static void vdiFlushImage(PVDIIMAGEDESC pImage)
221	{
222	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
223	{
224	/* Save header. */
225	int rc = vdiUpdateHeader(pImage);
226	AssertMsgRC(rc, ("vdiUpdateHeader() failed, filename=\"%s\", rc=%Rrc\n",
227	pImage->pszFilename, rc));
228	vdiFileFlushSync(pImage);
229	}
230	}
231
232	/**
233	* Internal: Free all allocated space for representing an image, and optionally
234	* delete the image from disk.
235	*/
236	static int vdiFreeImage(PVDIIMAGEDESC pImage, bool fDelete)
237	{
238	int rc = VINF_SUCCESS;
239
240	/* Freeing a never allocated image (e.g. because the open failed) is
241	* not signalled as an error. After all nothing bad happens. */
242	if (pImage)
243	{
244	if (pImage->pStorage)
245	{
246	/* No point updating the file that is deleted anyway. */
247	if (!fDelete)
248	vdiFlushImage(pImage);
249
250	vdiFileClose(pImage);
251	pImage->pStorage = NULL;
252	}
253
254	if (pImage->paBlocks)
255	{
256	RTMemFree(pImage->paBlocks);
257	pImage->paBlocks = NULL;
258	}
259
260	if (fDelete && pImage->pszFilename)
261	vdiFileDelete(pImage, pImage->pszFilename);
262	}
263
264	LogFlowFunc(("returns %Rrc\n", rc));
265	return rc;
266	}
267
268	/**
269	* internal: return power of 2 or 0 if num error.
270	*/
271	static unsigned getPowerOfTwo(unsigned uNumber)
272	{
273	if (uNumber == 0)
274	return 0;
275	unsigned uPower2 = 0;
276	while ((uNumber & 1) == 0)
277	{
278	uNumber >>= 1;
279	uPower2++;
280	}
281	return uNumber == 1 ? uPower2 : 0;
282	}
283
284	/**
285	* Internal: Init VDI preheader.
286	*/
287	static void vdiInitPreHeader(PVDIPREHEADER pPreHdr)
288	{
289	pPreHdr->u32Signature = VDI_IMAGE_SIGNATURE;
290	pPreHdr->u32Version = VDI_IMAGE_VERSION;
291	memset(pPreHdr->szFileInfo, 0, sizeof(pPreHdr->szFileInfo));
292	strncat(pPreHdr->szFileInfo, VDI_IMAGE_FILE_INFO, sizeof(pPreHdr->szFileInfo)-1);
293	}
294
295	/**
296	* Internal: check VDI preheader.
297	*/
298	static int vdiValidatePreHeader(PVDIPREHEADER pPreHdr)
299	{
300	if (pPreHdr->u32Signature != VDI_IMAGE_SIGNATURE)
301	return VERR_VD_VDI_INVALID_HEADER;
302
303	if ( VDI_GET_VERSION_MAJOR(pPreHdr->u32Version) != VDI_IMAGE_VERSION_MAJOR
304	&& pPreHdr->u32Version != 0x00000002) /* old version. */
305	return VERR_VD_VDI_UNSUPPORTED_VERSION;
306
307	return VINF_SUCCESS;
308	}
309
310	/**
311	* Internal: translate VD image flags to VDI image type enum.
312	*/
313	static VDIIMAGETYPE vdiTranslateImageFlags2VDI(unsigned uImageFlags)
314	{
315	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
316	return VDI_IMAGE_TYPE_FIXED;
317	else if (uImageFlags & VD_IMAGE_FLAGS_DIFF)
318	return VDI_IMAGE_TYPE_DIFF;
319	else
320	return VDI_IMAGE_TYPE_NORMAL;
321	}
322
323	/**
324	* Internal: translate VDI image type enum to VD image type enum.
325	*/
326	static unsigned vdiTranslateVDI2ImageFlags(VDIIMAGETYPE enmType)
327	{
328	switch (enmType)
329	{
330	case VDI_IMAGE_TYPE_NORMAL:
331	return VD_IMAGE_FLAGS_NONE;
332	case VDI_IMAGE_TYPE_FIXED:
333	return VD_IMAGE_FLAGS_FIXED;
334	case VDI_IMAGE_TYPE_DIFF:
335	return VD_IMAGE_FLAGS_DIFF;
336	default:
337	AssertMsgFailed(("invalid VDIIMAGETYPE enmType=%d\n", (int)enmType));
338	return VD_IMAGE_FLAGS_NONE;
339	}
340	}
341
342	/**
343	* Internal: Init VDI header. Always use latest header version.
344	* @param pHeader Assumes it was initially initialized to all zeros.
345	*/
346	static void vdiInitHeader(PVDIHEADER pHeader, uint32_t uImageFlags,
347	const char *pszComment, uint64_t cbDisk,
348	uint32_t cbBlock, uint32_t cbBlockExtra)
349	{
350	pHeader->uVersion = VDI_IMAGE_VERSION;
351	pHeader->u.v1plus.cbHeader = sizeof(VDIHEADER1PLUS);
352	pHeader->u.v1plus.u32Type = (uint32_t)vdiTranslateImageFlags2VDI(uImageFlags);
353	pHeader->u.v1plus.fFlags = (uImageFlags & VD_VDI_IMAGE_FLAGS_ZERO_EXPAND) ? 1 : 0;
354	#ifdef VBOX_STRICT
355	char achZero[VDI_IMAGE_COMMENT_SIZE] = {0};
356	Assert(!memcmp(pHeader->u.v1plus.szComment, achZero, VDI_IMAGE_COMMENT_SIZE));
357	#endif
358	pHeader->u.v1plus.szComment[0] = '\0';
359	if (pszComment)
360	{
361	AssertMsg(strlen(pszComment) < sizeof(pHeader->u.v1plus.szComment),
362	("HDD Comment is too long, cb=%d\n", strlen(pszComment)));
363	strncat(pHeader->u.v1plus.szComment, pszComment, sizeof(pHeader->u.v1plus.szComment)-1);
364	}
365
366	/* Mark the legacy geometry not-calculated. */
367	pHeader->u.v1plus.LegacyGeometry.cCylinders = 0;
368	pHeader->u.v1plus.LegacyGeometry.cHeads = 0;
369	pHeader->u.v1plus.LegacyGeometry.cSectors = 0;
370	pHeader->u.v1plus.LegacyGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
371	pHeader->u.v1plus.u32Dummy = 0; /* used to be the translation value */
372
373	pHeader->u.v1plus.cbDisk = cbDisk;
374	pHeader->u.v1plus.cbBlock = cbBlock;
375	pHeader->u.v1plus.cBlocks = (uint32_t)(cbDisk / cbBlock);
376	if (cbDisk % cbBlock)
377	pHeader->u.v1plus.cBlocks++;
378	pHeader->u.v1plus.cbBlockExtra = cbBlockExtra;
379	pHeader->u.v1plus.cBlocksAllocated = 0;
380
381	/* Init offsets. */
382	pHeader->u.v1plus.offBlocks = RT_ALIGN_32(sizeof(VDIPREHEADER) + sizeof(VDIHEADER1PLUS), VDI_DATA_ALIGN);
383	pHeader->u.v1plus.offData = RT_ALIGN_32(pHeader->u.v1plus.offBlocks + (pHeader->u.v1plus.cBlocks * sizeof(VDIIMAGEBLOCKPOINTER)), VDI_DATA_ALIGN);
384
385	/* Init uuids. */
386	RTUuidCreate(&pHeader->u.v1plus.uuidCreate);
387	RTUuidClear(&pHeader->u.v1plus.uuidModify);
388	RTUuidClear(&pHeader->u.v1plus.uuidLinkage);
389	RTUuidClear(&pHeader->u.v1plus.uuidParentModify);
390
391	/* Mark LCHS geometry not-calculated. */
392	pHeader->u.v1plus.LCHSGeometry.cCylinders = 0;
393	pHeader->u.v1plus.LCHSGeometry.cHeads = 0;
394	pHeader->u.v1plus.LCHSGeometry.cSectors = 0;
395	pHeader->u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
396	}
397
398	/**
399	* Internal: Check VDI header.
400	*/
401	static int vdiValidateHeader(PVDIHEADER pHeader)
402	{
403	/* Check version-dependent header parameters. */
404	switch (GET_MAJOR_HEADER_VERSION(pHeader))
405	{
406	case 0:
407	{
408	/* Old header version. */
409	break;
410	}
411	case 1:
412	{
413	/* Current header version. */
414
415	if (pHeader->u.v1.cbHeader < sizeof(VDIHEADER1))
416	{
417	LogRel(("VDI: v1 header size wrong (%d < %d)\n",
418	pHeader->u.v1.cbHeader, sizeof(VDIHEADER1)));
419	return VERR_VD_VDI_INVALID_HEADER;
420	}
421
422	if (getImageBlocksOffset(pHeader) < (sizeof(VDIPREHEADER) + sizeof(VDIHEADER1)))
423	{
424	LogRel(("VDI: v1 blocks offset wrong (%d < %d)\n",
425	getImageBlocksOffset(pHeader), sizeof(VDIPREHEADER) + sizeof(VDIHEADER1)));
426	return VERR_VD_VDI_INVALID_HEADER;
427	}
428
429	if (getImageDataOffset(pHeader) < (getImageBlocksOffset(pHeader) + getImageBlocks(pHeader) * sizeof(VDIIMAGEBLOCKPOINTER)))
430	{
431	LogRel(("VDI: v1 image data offset wrong (%d < %d)\n",
432	getImageDataOffset(pHeader), getImageBlocksOffset(pHeader) + getImageBlocks(pHeader) * sizeof(VDIIMAGEBLOCKPOINTER)));
433	return VERR_VD_VDI_INVALID_HEADER;
434	}
435
436	break;
437	}
438	default:
439	/* Unsupported. */
440	return VERR_VD_VDI_UNSUPPORTED_VERSION;
441	}
442
443	/* Check common header parameters. */
444
445	bool fFailed = false;
446
447	if ( getImageType(pHeader) < VDI_IMAGE_TYPE_FIRST
448	\|\| getImageType(pHeader) > VDI_IMAGE_TYPE_LAST)
449	{
450	LogRel(("VDI: bad image type %d\n", getImageType(pHeader)));
451	fFailed = true;
452	}
453
454	if (getImageFlags(pHeader) & ~VD_VDI_IMAGE_FLAGS_MASK)
455	{
456	LogRel(("VDI: bad image flags %08x\n", getImageFlags(pHeader)));
457	fFailed = true;
458	}
459
460	if ( getImageLCHSGeometry(pHeader)
461	&& (getImageLCHSGeometry(pHeader))->cbSector != VDI_GEOMETRY_SECTOR_SIZE)
462	{
463	LogRel(("VDI: wrong sector size (%d != %d)\n",
464	(getImageLCHSGeometry(pHeader))->cbSector, VDI_GEOMETRY_SECTOR_SIZE));
465	fFailed = true;
466	}
467
468	if ( getImageDiskSize(pHeader) == 0
469	\|\| getImageBlockSize(pHeader) == 0
470	\|\| getImageBlocks(pHeader) == 0
471	\|\| getPowerOfTwo(getImageBlockSize(pHeader)) == 0)
472	{
473	LogRel(("VDI: wrong size (%lld, %d, %d, %d)\n",
474	getImageDiskSize(pHeader), getImageBlockSize(pHeader),
475	getImageBlocks(pHeader), getPowerOfTwo(getImageBlockSize(pHeader))));
476	fFailed = true;
477	}
478
479	if (getImageBlocksAllocated(pHeader) > getImageBlocks(pHeader))
480	{
481	LogRel(("VDI: too many blocks allocated (%d > %d)\n"
482	" blocksize=%d disksize=%lld\n",
483	getImageBlocksAllocated(pHeader), getImageBlocks(pHeader),
484	getImageBlockSize(pHeader), getImageDiskSize(pHeader)));
485	fFailed = true;
486	}
487
488	if ( getImageExtraBlockSize(pHeader) != 0
489	&& getPowerOfTwo(getImageExtraBlockSize(pHeader)) == 0)
490	{
491	LogRel(("VDI: wrong extra size (%d, %d)\n",
492	getImageExtraBlockSize(pHeader), getPowerOfTwo(getImageExtraBlockSize(pHeader))));
493	fFailed = true;
494	}
495
496	if ((uint64_t)getImageBlockSize(pHeader) * getImageBlocks(pHeader) < getImageDiskSize(pHeader))
497	{
498	LogRel(("VDI: wrong disk size (%d, %d, %lld)\n",
499	getImageBlockSize(pHeader), getImageBlocks(pHeader), getImageDiskSize(pHeader)));
500	fFailed = true;
501	}
502
503	if (RTUuidIsNull(getImageCreationUUID(pHeader)))
504	{
505	LogRel(("VDI: uuid of creator is 0\n"));
506	fFailed = true;
507	}
508
509	if (RTUuidIsNull(getImageModificationUUID(pHeader)))
510	{
511	LogRel(("VDI: uuid of modifier is 0\n"));
512	fFailed = true;
513	}
514
515	return fFailed ? VERR_VD_VDI_INVALID_HEADER : VINF_SUCCESS;
516	}
517
518	/**
519	* Internal: Set up VDIIMAGEDESC structure by image header.
520	*/
521	static void vdiSetupImageDesc(PVDIIMAGEDESC pImage)
522	{
523	pImage->uImageFlags = getImageFlags(&pImage->Header);
524	pImage->uImageFlags \|= vdiTranslateVDI2ImageFlags(getImageType(&pImage->Header));
525	pImage->offStartBlocks = getImageBlocksOffset(&pImage->Header);
526	pImage->offStartData = getImageDataOffset(&pImage->Header);
527	pImage->uBlockMask = getImageBlockSize(&pImage->Header) - 1;
528	pImage->uShiftOffset2Index = getPowerOfTwo(getImageBlockSize(&pImage->Header));
529	pImage->offStartBlockData = getImageExtraBlockSize(&pImage->Header);
530	pImage->cbTotalBlockData = pImage->offStartBlockData
531	+ getImageBlockSize(&pImage->Header);
532	}
533
534	/**
535	* Internal: Create VDI image file.
536	*/
537	static int vdiCreateImage(PVDIIMAGEDESC pImage, uint64_t cbSize,
538	unsigned uImageFlags, const char *pszComment,
539	PCVDGEOMETRY pPCHSGeometry,
540	PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
541	unsigned uOpenFlags, PFNVDPROGRESS pfnProgress,
542	void *pvUser, unsigned uPercentStart,
543	unsigned uPercentSpan)
544	{
545	int rc;
546	uint64_t cbTotal;
547	uint64_t cbFill;
548	uint64_t uOff;
549
550	/* Special check for comment length. */
551	if ( VALID_PTR(pszComment)
552	&& strlen(pszComment) >= VDI_IMAGE_COMMENT_SIZE)
553	{
554	rc = vdiError(pImage, VERR_VD_VDI_COMMENT_TOO_LONG, RT_SRC_POS, N_("VDI: comment is too long for '%s'"), pImage->pszFilename);
555	goto out;
556	}
557	AssertPtr(pPCHSGeometry);
558	AssertPtr(pLCHSGeometry);
559
560	pImage->pInterfaceError = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_ERROR);
561	if (pImage->pInterfaceError)
562	pImage->pInterfaceErrorCallbacks = VDGetInterfaceError(pImage->pInterfaceError);
563
564	/* Get I/O interface. */
565	pImage->pInterfaceIO = VDInterfaceGet(pImage->pVDIfsImage, VDINTERFACETYPE_IOINT);
566	AssertPtrReturn(pImage->pInterfaceIO, VERR_INVALID_PARAMETER);
567	pImage->pInterfaceIOCallbacks = VDGetInterfaceIOInt(pImage->pInterfaceIO);
568	AssertPtrReturn(pImage->pInterfaceIOCallbacks, VERR_INVALID_PARAMETER);
569
570	vdiInitPreHeader(&pImage->PreHeader);
571	vdiInitHeader(&pImage->Header, uImageFlags, pszComment, cbSize, VDI_IMAGE_DEFAULT_BLOCK_SIZE, 0);
572	/* Save PCHS geometry. Not much work, and makes the flow of information
573	* quite a bit clearer - relying on the higher level isn't obvious. */
574	pImage->PCHSGeometry = *pPCHSGeometry;
575	/* Set LCHS geometry (legacy geometry is ignored for the current 1.1+). */
576	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = pLCHSGeometry->cCylinders;
577	pImage->Header.u.v1plus.LCHSGeometry.cHeads = pLCHSGeometry->cHeads;
578	pImage->Header.u.v1plus.LCHSGeometry.cSectors = pLCHSGeometry->cSectors;
579	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
580
581	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
582	if (!pImage->paBlocks)
583	{
584	rc = VERR_NO_MEMORY;
585	goto out;
586	}
587
588	if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
589	{
590	/* for growing images mark all blocks in paBlocks as free. */
591	for (unsigned i = 0; i < pImage->Header.u.v1.cBlocks; i++)
592	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
593	}
594	else
595	{
596	/* for fixed images mark all blocks in paBlocks as allocated */
597	for (unsigned i = 0; i < pImage->Header.u.v1.cBlocks; i++)
598	pImage->paBlocks[i] = i;
599	pImage->Header.u.v1.cBlocksAllocated = pImage->Header.u.v1.cBlocks;
600	}
601
602	/* Setup image parameters. */
603	vdiSetupImageDesc(pImage);
604
605	/* Create image file. */
606	rc = vdiFileOpen(pImage, pImage->pszFilename,
607	VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY,
608	true /* fCreate */));
609	if (RT_FAILURE(rc))
610	{
611	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: cannot create image '%s'"), pImage->pszFilename);
612	goto out;
613	}
614
615	cbTotal = pImage->offStartData
616	+ (uint64_t)getImageBlocks(&pImage->Header) * pImage->cbTotalBlockData;
617
618	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
619	{
620	/* Check the free space on the disk and leave early if there is not
621	* sufficient space available. */
622	int64_t cbFree = 0;
623	rc = vdiFileGetFreeSpace(pImage, pImage->pszFilename, &cbFree);
624	if (RT_SUCCESS(rc) /* ignore errors */ && ((uint64_t)cbFree < cbTotal))
625	{
626	rc = vdiError(pImage, VERR_DISK_FULL, RT_SRC_POS, N_("VDI: disk would overflow creating image '%s'"), pImage->pszFilename);
627	goto out;
628	}
629	}
630
631	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
632	{
633	/*
634	* Allocate & commit whole file if fixed image, it must be more
635	* effective than expanding file by write operations.
636	*/
637	rc = vdiFileSetSize(pImage, cbTotal);
638	}
639	else
640	{
641	/* Set file size to hold header and blocks array. */
642	rc = vdiFileSetSize(pImage, pImage->offStartData);
643	}
644	if (RT_FAILURE(rc))
645	{
646	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: setting image size failed for '%s'"), pImage->pszFilename);
647	goto out;
648	}
649
650	/* Use specified image uuid */
651	getImageCreationUUID(&pImage->Header) = pUuid;
652
653	/* Generate image last-modify uuid */
654	RTUuidCreate(getImageModificationUUID(&pImage->Header));
655
656	/* Write pre-header. */
657	rc = vdiFileWriteSync(pImage, 0, &pImage->PreHeader, sizeof(pImage->PreHeader), NULL);
658	if (RT_FAILURE(rc))
659	{
660	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing pre-header failed for '%s'"), pImage->pszFilename);
661	goto out;
662	}
663
664	/* Write header. */
665	rc = vdiFileWriteSync(pImage, sizeof(pImage->PreHeader),
666	&pImage->Header.u.v1plus,
667	sizeof(pImage->Header.u.v1plus), NULL);
668	if (RT_FAILURE(rc))
669	{
670	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing header failed for '%s'"), pImage->pszFilename);
671	goto out;
672	}
673
674	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
675	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
676	NULL);
677	if (RT_FAILURE(rc))
678	{
679	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing block pointers failed for '%s'"), pImage->pszFilename);
680	goto out;
681	}
682
683	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
684	{
685	/* Fill image with zeroes. We do this for every fixed-size image since on some systems
686	* (for example Windows Vista), it takes ages to write a block near the end of a sparse
687	* file and the guest could complain about an ATA timeout. */
688
689	/** @todo Starting with Linux 2.6.23, there is an fallocate() system call.
690	* Currently supported file systems are ext4 and ocfs2. */
691
692	/* Allocate a temporary zero-filled buffer. Use a bigger block size to optimize writing */
693	const size_t cbBuf = 128 * _1K;
694	void *pvBuf = RTMemTmpAllocZ(cbBuf);
695	if (!pvBuf)
696	{
697	rc = VERR_NO_MEMORY;
698	goto out;
699	}
700
701	cbFill = (uint64_t)getImageBlocks(&pImage->Header) * pImage->cbTotalBlockData;
702	uOff = 0;
703	/* Write data to all image blocks. */
704	while (uOff < cbFill)
705	{
706	unsigned cbChunk = (unsigned)RT_MIN(cbFill, cbBuf);
707
708	rc = vdiFileWriteSync(pImage, pImage->offStartData + uOff,
709	pvBuf, cbChunk, NULL);
710	if (RT_FAILURE(rc))
711	{
712	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing block failed for '%s'"), pImage->pszFilename);
713	RTMemTmpFree(pvBuf);
714	goto out;
715	}
716
717	uOff += cbChunk;
718
719	if (pfnProgress)
720	{
721	rc = pfnProgress(pvUser,
722	uPercentStart + uOff * uPercentSpan / cbFill);
723	if (RT_FAILURE(rc))
724	goto out;
725	}
726	}
727	RTMemTmpFree(pvBuf);
728	}
729
730	out:
731	if (RT_SUCCESS(rc) && pfnProgress)
732	pfnProgress(pvUser, uPercentStart + uPercentSpan);
733
734	if (RT_FAILURE(rc))
735	vdiFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
736	return rc;
737	}
738
739	/**
740	* Internal: Open a VDI image.
741	*/
742	static int vdiOpenImage(PVDIIMAGEDESC pImage, unsigned uOpenFlags)
743	{
744	int rc;
745
746	pImage->uOpenFlags = uOpenFlags;
747
748	pImage->pInterfaceError = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_ERROR);
749	if (pImage->pInterfaceError)
750	pImage->pInterfaceErrorCallbacks = VDGetInterfaceError(pImage->pInterfaceError);
751
752	/* Get I/O interface. */
753	pImage->pInterfaceIO = VDInterfaceGet(pImage->pVDIfsImage, VDINTERFACETYPE_IOINT);
754	AssertPtrReturn(pImage->pInterfaceIO, VERR_INVALID_PARAMETER);
755	pImage->pInterfaceIOCallbacks = VDGetInterfaceIOInt(pImage->pInterfaceIO);
756	AssertPtrReturn(pImage->pInterfaceIOCallbacks, VERR_INVALID_PARAMETER);
757
758	/*
759	* Open the image.
760	*/
761	rc = vdiFileOpen(pImage, pImage->pszFilename,
762	VDOpenFlagsToFileOpenFlags(uOpenFlags, false /* fCreate */));
763	if (RT_FAILURE(rc))
764	{
765	/* Do NOT signal an appropriate error here, as the VD layer has the
766	* choice of retrying the open if it failed. */
767	goto out;
768	}
769
770	/* Read pre-header. */
771	rc = vdiFileReadSync(pImage, 0, &pImage->PreHeader, sizeof(pImage->PreHeader), NULL);
772	if (RT_FAILURE(rc))
773	{
774	vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading pre-header in '%s'"), pImage->pszFilename);
775	rc = VERR_VD_VDI_INVALID_HEADER;
776	goto out;
777	}
778	rc = vdiValidatePreHeader(&pImage->PreHeader);
779	if (RT_FAILURE(rc))
780	{
781	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: invalid pre-header in '%s'"), pImage->pszFilename);
782	goto out;
783	}
784
785	/* Read header. */
786	pImage->Header.uVersion = pImage->PreHeader.u32Version;
787	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
788	{
789	case 0:
790	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
791	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
792	NULL);
793	if (RT_FAILURE(rc))
794	{
795	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v0 header in '%s'"), pImage->pszFilename);
796	goto out;
797	}
798	break;
799	case 1:
800	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
801	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
802	NULL);
803	if (RT_FAILURE(rc))
804	{
805	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1 header in '%s'"), pImage->pszFilename);
806	goto out;
807	}
808	/* Convert VDI 1.1 images to VDI 1.1+ on open in read/write mode.
809	* Conversion is harmless, as any VirtualBox version supporting VDI
810	* 1.1 doesn't touch fields it doesn't know about. */
811	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
812	&& GET_MINOR_HEADER_VERSION(&pImage->Header) == 1
813	&& pImage->Header.u.v1.cbHeader < sizeof(pImage->Header.u.v1plus))
814	{
815	pImage->Header.u.v1plus.cbHeader = sizeof(pImage->Header.u.v1plus);
816	/* Mark LCHS geometry not-calculated. */
817	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = 0;
818	pImage->Header.u.v1plus.LCHSGeometry.cHeads = 0;
819	pImage->Header.u.v1plus.LCHSGeometry.cSectors = 0;
820	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
821	}
822	else if (pImage->Header.u.v1.cbHeader >= sizeof(pImage->Header.u.v1plus))
823	{
824	/* Read the actual VDI 1.1+ header completely. */
825	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
826	&pImage->Header.u.v1plus,
827	sizeof(pImage->Header.u.v1plus), NULL);
828	if (RT_FAILURE(rc))
829	{
830	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1.1+ header in '%s'"), pImage->pszFilename);
831	goto out;
832	}
833	}
834	break;
835	default:
836	rc = vdiError(pImage, VERR_VD_VDI_UNSUPPORTED_VERSION, RT_SRC_POS, N_("VDI: unsupported major version %u in '%s'"), GET_MAJOR_HEADER_VERSION(&pImage->Header), pImage->pszFilename);
837	goto out;
838	}
839
840	rc = vdiValidateHeader(&pImage->Header);
841	if (RT_FAILURE(rc))
842	{
843	rc = vdiError(pImage, VERR_VD_VDI_INVALID_HEADER, RT_SRC_POS, N_("VDI: invalid header in '%s'"), pImage->pszFilename);
844	goto out;
845	}
846
847	/* Setup image parameters by header. */
848	vdiSetupImageDesc(pImage);
849
850	/* Allocate memory for blocks array. */
851	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
852	if (!pImage->paBlocks)
853	{
854	rc = VERR_NO_MEMORY;
855	goto out;
856	}
857
858	/* Read blocks array. */
859	rc = vdiFileReadSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
860	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
861	NULL);
862
863	out:
864	if (RT_FAILURE(rc))
865	vdiFreeImage(pImage, false);
866	return rc;
867	}
868
869	/**
870	* Internal: Save header to file.
871	*/
872	static int vdiUpdateHeader(PVDIIMAGEDESC pImage)
873	{
874	int rc;
875	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
876	{
877	case 0:
878	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
879	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
880	NULL);
881	break;
882	case 1:
883	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
884	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
885	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
886	NULL);
887	else
888	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
889	&pImage->Header.u.v1plus, sizeof(pImage->Header.u.v1plus),
890	NULL);
891	break;
892	default:
893	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
894	break;
895	}
896	AssertMsgRC(rc, ("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
897	return rc;
898	}
899
900	/**
901	* Internal: Save header to file - async version.
902	*/
903	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
904	{
905	int rc;
906	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
907	{
908	case 0:
909	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
910	&pImage->Header.u.v0,
911	sizeof(pImage->Header.u.v0),
912	pIoCtx, NULL, NULL);
913	break;
914	case 1:
915	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
916	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
917	&pImage->Header.u.v1,
918	sizeof(pImage->Header.u.v1),
919	pIoCtx, NULL, NULL);
920	else
921	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
922	&pImage->Header.u.v1plus,
923	sizeof(pImage->Header.u.v1plus),
924	pIoCtx, NULL, NULL);
925	break;
926	default:
927	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
928	break;
929	}
930	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
931	("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
932	return rc;
933	}
934
935	/**
936	* Internal: Save block pointer to file, save header to file.
937	*/
938	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock)
939	{
940	/* Update image header. */
941	int rc = vdiUpdateHeader(pImage);
942	if (RT_SUCCESS(rc))
943	{
944	/* write only one block pointer. */
945	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
946	&pImage->paBlocks[uBlock], sizeof(VDIIMAGEBLOCKPOINTER),
947	NULL);
948	AssertMsgRC(rc, ("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
949	uBlock, pImage->pszFilename, rc));
950	}
951	return rc;
952	}
953
954	/**
955	* Internal: Save block pointer to file, save header to file - async version.
956	*/
957	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock,
958	PVDIOCTX pIoCtx)
959	{
960	/* Update image header. */
961	int rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
962	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
963	{
964	/* write only one block pointer. */
965	rc = vdiFileWriteMetaAsync(pImage,
966	pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
967	&pImage->paBlocks[uBlock],
968	sizeof(VDIIMAGEBLOCKPOINTER),
969	pIoCtx, NULL, NULL);
970	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
971	("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
972	uBlock, pImage->pszFilename, rc));
973	}
974	return rc;
975	}
976
977	/**
978	* Internal: Flush the image file to disk - async version.
979	*/
980	static int vdiFlushImageAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
981	{
982	int rc = VINF_SUCCESS;
983
984	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
985	{
986	/* Save header. */
987	rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
988	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
989	("vdiUpdateHeaderAsync() failed, filename=\"%s\", rc=%Rrc\n",
990	pImage->pszFilename, rc));
991	rc = vdiFileFlushAsync(pImage, pIoCtx, NULL, NULL);
992	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
993	("Flushing data to disk failed rc=%Rrc\n", rc));
994	}
995
996	return rc;
997	}
998
999
1000	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
1001	static int vdiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1002	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
1003	{
1004	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
1005	int rc = VINF_SUCCESS;
1006	PVDIIMAGEDESC pImage;
1007
1008	if ( !VALID_PTR(pszFilename)
1009	\|\| !*pszFilename)
1010	{
1011	rc = VERR_INVALID_PARAMETER;
1012	goto out;
1013	}
1014
1015	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1016	if (!pImage)
1017	{
1018	rc = VERR_NO_MEMORY;
1019	goto out;
1020	}
1021	pImage->pszFilename = pszFilename;
1022	pImage->pStorage = NULL;
1023	pImage->paBlocks = NULL;
1024	pImage->pVDIfsDisk = pVDIfsDisk;
1025	pImage->pVDIfsImage = pVDIfsImage;
1026
1027	rc = vdiOpenImage(pImage, VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_READONLY);
1028	vdiFreeImage(pImage, false);
1029	RTMemFree(pImage);
1030
1031	if (RT_SUCCESS(rc))
1032	*penmType = VDTYPE_HDD;
1033
1034	out:
1035	LogFlowFunc(("returns %Rrc\n", rc));
1036	return rc;
1037	}
1038
1039	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1040	static int vdiOpen(const char *pszFilename, unsigned uOpenFlags,
1041	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1042	VDTYPE enmType, void **ppBackendData)
1043	{
1044	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
1045	int rc;
1046	PVDIIMAGEDESC pImage;
1047
1048	/* Check open flags. All valid flags are supported. */
1049	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1050	{
1051	rc = VERR_INVALID_PARAMETER;
1052	goto out;
1053	}
1054
1055	/* Check remaining arguments. */
1056	if ( !VALID_PTR(pszFilename)
1057	\|\| !*pszFilename)
1058	{
1059	rc = VERR_INVALID_PARAMETER;
1060	goto out;
1061	}
1062
1063	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1064	if (!pImage)
1065	{
1066	rc = VERR_NO_MEMORY;
1067	goto out;
1068	}
1069	pImage->pszFilename = pszFilename;
1070	pImage->pStorage = NULL;
1071	pImage->paBlocks = NULL;
1072	pImage->pVDIfsDisk = pVDIfsDisk;
1073	pImage->pVDIfsImage = pVDIfsImage;
1074
1075	rc = vdiOpenImage(pImage, uOpenFlags);
1076	if (RT_SUCCESS(rc))
1077	*ppBackendData = pImage;
1078
1079	out:
1080	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1081	return rc;
1082	}
1083
1084	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1085	static int vdiCreate(const char *pszFilename, uint64_t cbSize,
1086	unsigned uImageFlags, const char *pszComment,
1087	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1088	PCRTUUID pUuid, unsigned uOpenFlags,
1089	unsigned uPercentStart, unsigned uPercentSpan,
1090	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1091	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
1092	{
1093	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", pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
1094	int rc;
1095	PVDIIMAGEDESC pImage;
1096
1097	PFNVDPROGRESS pfnProgress = NULL;
1098	void *pvUser = NULL;
1099	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
1100	VDINTERFACETYPE_PROGRESS);
1101	PVDINTERFACEPROGRESS pCbProgress = NULL;
1102	if (pIfProgress)
1103	{
1104	pCbProgress = VDGetInterfaceProgress(pIfProgress);
1105	if (pCbProgress)
1106	pfnProgress = pCbProgress->pfnProgress;
1107	pvUser = pIfProgress->pvUser;
1108	}
1109
1110	/* Check open flags. All valid flags are supported. */
1111	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1112	{
1113	rc = VERR_INVALID_PARAMETER;
1114	goto out;
1115	}
1116
1117	/* Check size. Maximum 4PB-3M. No tricks with adjusting the 1M block size
1118	* so far, which would extend the size. */
1119	cbSize = RT_ALIGN_64(cbSize, _1M);
1120	if ( !cbSize
1121	\|\| cbSize >= _1P * 4 - _1M * 3)
1122	{
1123	rc = VERR_VD_INVALID_SIZE;
1124	goto out;
1125	}
1126
1127	/* Check remaining arguments. */
1128	if ( !VALID_PTR(pszFilename)
1129	\|\| !*pszFilename
1130	\|\| cbSize < VDI_IMAGE_DEFAULT_BLOCK_SIZE
1131	\|\| !VALID_PTR(pPCHSGeometry)
1132	\|\| !VALID_PTR(pLCHSGeometry))
1133	{
1134	rc = VERR_INVALID_PARAMETER;
1135	goto out;
1136	}
1137
1138	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1139	if (!pImage)
1140	{
1141	rc = VERR_NO_MEMORY;
1142	goto out;
1143	}
1144	pImage->pszFilename = pszFilename;
1145	pImage->pStorage = NULL;
1146	pImage->paBlocks = NULL;
1147	pImage->pVDIfsDisk = pVDIfsDisk;
1148	pImage->pVDIfsImage = pVDIfsImage;
1149
1150	rc = vdiCreateImage(pImage, cbSize, uImageFlags, pszComment,
1151	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1152	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1153	if (RT_SUCCESS(rc))
1154	{
1155	/* So far the image is opened in read/write mode. Make sure the
1156	* image is opened in read-only mode if the caller requested that. */
1157	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1158	{
1159	vdiFreeImage(pImage, false);
1160	rc = vdiOpenImage(pImage, uOpenFlags);
1161	if (RT_FAILURE(rc))
1162	{
1163	RTMemFree(pImage);
1164	goto out;
1165	}
1166	}
1167	*ppBackendData = pImage;
1168	}
1169	else
1170	RTMemFree(pImage);
1171
1172	out:
1173	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1174	return rc;
1175	}
1176
1177	/** @copydoc VBOXHDDBACKEND::pfnRename */
1178	static int vdiRename(void pBackendData, const char pszFilename)
1179	{
1180	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1181
1182	int rc = VINF_SUCCESS;
1183	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1184
1185	/* Check arguments. */
1186	if ( !pImage
1187	\|\| !pszFilename
1188	\|\| !*pszFilename)
1189	{
1190	rc = VERR_INVALID_PARAMETER;
1191	goto out;
1192	}
1193
1194	/* Close the image. */
1195	vdiFreeImage(pImage, false);
1196
1197	/* Rename the file. */
1198	rc = vdiFileMove(pImage, pImage->pszFilename, pszFilename, 0);
1199	if (RT_FAILURE(rc))
1200	{
1201	/* The move failed, try to reopen the original image. */
1202	int rc2 = vdiOpenImage(pImage, pImage->uOpenFlags);
1203	if (RT_FAILURE(rc2))
1204	rc = rc2;
1205
1206	goto out;
1207	}
1208
1209	/* Update pImage with the new information. */
1210	pImage->pszFilename = pszFilename;
1211
1212	/* Open the new image. */
1213	rc = vdiOpenImage(pImage, pImage->uOpenFlags);
1214	if (RT_FAILURE(rc))
1215	goto out;
1216
1217	out:
1218	LogFlowFunc(("returns %Rrc\n", rc));
1219	return rc;
1220	}
1221
1222	/** @copydoc VBOXHDDBACKEND::pfnClose */
1223	static int vdiClose(void *pBackendData, bool fDelete)
1224	{
1225	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1226	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1227	int rc;
1228
1229	rc = vdiFreeImage(pImage, fDelete);
1230	RTMemFree(pImage);
1231
1232	LogFlowFunc(("returns %Rrc\n", rc));
1233	return rc;
1234	}
1235
1236	/** @copydoc VBOXHDDBACKEND::pfnRead */
1237	static int vdiRead(void pBackendData, uint64_t uOffset, void pvBuf,
1238	size_t cbToRead, size_t *pcbActuallyRead)
1239	{
1240	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
1241	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1242	unsigned uBlock;
1243	unsigned offRead;
1244	int rc;
1245
1246	AssertPtr(pImage);
1247	Assert(!(uOffset % 512));
1248	Assert(!(cbToRead % 512));
1249
1250	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
1251	\|\| !VALID_PTR(pvBuf)
1252	\|\| !cbToRead)
1253	{
1254	rc = VERR_INVALID_PARAMETER;
1255	goto out;
1256	}
1257
1258	/* Calculate starting block number and offset inside it. */
1259	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1260	offRead = (unsigned)uOffset & pImage->uBlockMask;
1261
1262	/* Clip read range to at most the rest of the block. */
1263	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
1264	Assert(!(cbToRead % 512));
1265
1266	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
1267	rc = VERR_VD_BLOCK_FREE;
1268	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
1269	{
1270	memset(pvBuf, 0, cbToRead);
1271	rc = VINF_SUCCESS;
1272	}
1273	else
1274	{
1275	/* Block present in image file, read relevant data. */
1276	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1277	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
1278	rc = vdiFileReadSync(pImage, u64Offset, pvBuf, cbToRead, NULL);
1279	}
1280
1281	if (pcbActuallyRead)
1282	*pcbActuallyRead = cbToRead;
1283
1284	out:
1285	LogFlowFunc(("returns %Rrc\n", rc));
1286	return rc;
1287	}
1288
1289	/*@copydoc VBOXHDDBACKEND::pfnWrite /
1290	static int vdiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
1291	size_t cbToWrite, size_t *pcbWriteProcess,
1292	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
1293	{
1294	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1295	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1296	unsigned uBlock;
1297	unsigned offWrite;
1298	int rc = VINF_SUCCESS;
1299
1300	AssertPtr(pImage);
1301	Assert(!(uOffset % 512));
1302	Assert(!(cbToWrite % 512));
1303
1304	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1305	{
1306	rc = VERR_VD_IMAGE_READ_ONLY;
1307	goto out;
1308	}
1309
1310	if (!VALID_PTR(pvBuf) \|\| !cbToWrite)
1311	{
1312	rc = VERR_INVALID_PARAMETER;
1313	goto out;
1314	}
1315
1316	/* No size check here, will do that later. For dynamic images which are
1317	* not multiples of the block size in length, this would prevent writing to
1318	* the last block. */
1319
1320	/* Calculate starting block number and offset inside it. */
1321	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1322	offWrite = (unsigned)uOffset & pImage->uBlockMask;
1323
1324	/* Clip write range to at most the rest of the block. */
1325	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
1326	Assert(!(cbToWrite % 512));
1327
1328	do
1329	{
1330	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
1331	{
1332	/* Block is either free or zero. */
1333	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
1334	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
1335	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
1336	{
1337	/* If the destination block is unallocated at this point, it's
1338	* either a zero block or a block which hasn't been used so far
1339	* (which also means that it's a zero block. Don't need to write
1340	* anything to this block if the data consists of just zeroes. */
1341	Assert(!(cbToWrite % 4));
1342	Assert(cbToWrite * 8 <= UINT32_MAX);
1343	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
1344	{
1345	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
1346	break;
1347	}
1348	}
1349
1350	if (cbToWrite == getImageBlockSize(&pImage->Header))
1351	{
1352	/* Full block write to previously unallocated block.
1353	* Allocate block and write data. */
1354	Assert(!offWrite);
1355	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
1356	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
1357	+ (pImage->offStartData + pImage->offStartBlockData);
1358	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1359	if (RT_FAILURE(rc))
1360	goto out;
1361	pImage->paBlocks[uBlock] = cBlocksAllocated;
1362	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
1363
1364	rc = vdiUpdateBlockInfo(pImage, uBlock);
1365	if (RT_FAILURE(rc))
1366	goto out;
1367
1368	*pcbPreRead = 0;
1369	*pcbPostRead = 0;
1370	}
1371	else
1372	{
1373	/* Trying to do a partial write to an unallocated block. Don't do
1374	* anything except letting the upper layer know what to do. */
1375	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
1376	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
1377	rc = VERR_VD_BLOCK_FREE;
1378	}
1379	}
1380	else
1381	{
1382	/* Block present in image file, write relevant data. */
1383	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1384	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
1385	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1386	}
1387	} while (0);
1388
1389	if (pcbWriteProcess)
1390	*pcbWriteProcess = cbToWrite;
1391
1392	out:
1393	LogFlowFunc(("returns %Rrc\n", rc));
1394	return rc;
1395	}
1396
1397	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1398	static int vdiFlush(void *pBackendData)
1399	{
1400	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1401	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1402	int rc = VINF_SUCCESS;
1403
1404	Assert(pImage);
1405
1406	vdiFlushImage(pImage);
1407	LogFlowFunc(("returns %Rrc\n", rc));
1408	return rc;
1409	}
1410
1411	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
1412	static unsigned vdiGetVersion(void *pBackendData)
1413	{
1414	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1415	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1416	unsigned uVersion;
1417
1418	AssertPtr(pImage);
1419
1420	if (pImage)
1421	uVersion = pImage->PreHeader.u32Version;
1422	else
1423	uVersion = 0;
1424
1425	LogFlowFunc(("returns %#x\n", uVersion));
1426	return uVersion;
1427	}
1428
1429	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
1430	static uint64_t vdiGetSize(void *pBackendData)
1431	{
1432	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1433	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1434	uint64_t cbSize;
1435
1436	AssertPtr(pImage);
1437
1438	if (pImage)
1439	cbSize = getImageDiskSize(&pImage->Header);
1440	else
1441	cbSize = 0;
1442
1443	LogFlowFunc(("returns %llu\n", cbSize));
1444	return cbSize;
1445	}
1446
1447	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
1448	static uint64_t vdiGetFileSize(void *pBackendData)
1449	{
1450	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1451	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1452	uint64_t cb = 0;
1453
1454	AssertPtr(pImage);
1455
1456	if (pImage)
1457	{
1458	uint64_t cbFile;
1459	if (pImage->pStorage)
1460	{
1461	int rc = vdiFileGetSize(pImage, &cbFile);
1462	if (RT_SUCCESS(rc))
1463	cb += cbFile;
1464	}
1465	}
1466
1467	LogFlowFunc(("returns %lld\n", cb));
1468	return cb;
1469	}
1470
1471	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
1472	static int vdiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1473	{
1474	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1475	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1476	int rc;
1477
1478	AssertPtr(pImage);
1479
1480	if (pImage)
1481	{
1482	if (pImage->PCHSGeometry.cCylinders)
1483	{
1484	*pPCHSGeometry = pImage->PCHSGeometry;
1485	rc = VINF_SUCCESS;
1486	}
1487	else
1488	rc = VERR_VD_GEOMETRY_NOT_SET;
1489	}
1490	else
1491	rc = VERR_VD_NOT_OPENED;
1492
1493	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1494	return rc;
1495	}
1496
1497	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
1498	static int vdiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1499	{
1500	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1501	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1502	int rc;
1503
1504	AssertPtr(pImage);
1505
1506	if (pImage)
1507	{
1508	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1509	{
1510	rc = VERR_VD_IMAGE_READ_ONLY;
1511	goto out;
1512	}
1513
1514	pImage->PCHSGeometry = *pPCHSGeometry;
1515	rc = VINF_SUCCESS;
1516	}
1517	else
1518	rc = VERR_VD_NOT_OPENED;
1519
1520	out:
1521	LogFlowFunc(("returns %Rrc\n", rc));
1522	return rc;
1523	}
1524
1525	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
1526	static int vdiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1527	{
1528	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1529	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1530	int rc;
1531
1532	AssertPtr(pImage);
1533
1534	if (pImage)
1535	{
1536	VDIDISKGEOMETRY DummyGeo = { 0, 0, 0, VDI_GEOMETRY_SECTOR_SIZE };
1537	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
1538	if (!pGeometry)
1539	pGeometry = &DummyGeo;
1540
1541	if ( pGeometry->cCylinders > 0
1542	&& pGeometry->cHeads > 0
1543	&& pGeometry->cSectors > 0)
1544	{
1545	pLCHSGeometry->cCylinders = pGeometry->cCylinders;
1546	pLCHSGeometry->cHeads = pGeometry->cHeads;
1547	pLCHSGeometry->cSectors = pGeometry->cSectors;
1548	rc = VINF_SUCCESS;
1549	}
1550	else
1551	rc = VERR_VD_GEOMETRY_NOT_SET;
1552	}
1553	else
1554	rc = VERR_VD_NOT_OPENED;
1555
1556	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1557	return rc;
1558	}
1559
1560	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
1561	static int vdiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1562	{
1563	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1564	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1565	PVDIDISKGEOMETRY pGeometry;
1566	int rc;
1567
1568	AssertPtr(pImage);
1569
1570	if (pImage)
1571	{
1572	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1573	{
1574	rc = VERR_VD_IMAGE_READ_ONLY;
1575	goto out;
1576	}
1577
1578	pGeometry = getImageLCHSGeometry(&pImage->Header);
1579	if (pGeometry)
1580	{
1581	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
1582	pGeometry->cHeads = pLCHSGeometry->cHeads;
1583	pGeometry->cSectors = pLCHSGeometry->cSectors;
1584	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
1585
1586	/* Update header information in base image file. */
1587	vdiFlushImage(pImage);
1588	}
1589	rc = VINF_SUCCESS;
1590	}
1591	else
1592	rc = VERR_VD_NOT_OPENED;
1593
1594	out:
1595	LogFlowFunc(("returns %Rrc\n", rc));
1596	return rc;
1597	}
1598
1599	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
1600	static unsigned vdiGetImageFlags(void *pBackendData)
1601	{
1602	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1603	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1604	unsigned uImageFlags;
1605
1606	AssertPtr(pImage);
1607
1608	if (pImage)
1609	uImageFlags = pImage->uImageFlags;
1610	else
1611	uImageFlags = 0;
1612
1613	LogFlowFunc(("returns %#x\n", uImageFlags));
1614	return uImageFlags;
1615	}
1616
1617	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
1618	static unsigned vdiGetOpenFlags(void *pBackendData)
1619	{
1620	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1621	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1622	unsigned uOpenFlags;
1623
1624	AssertPtr(pImage);
1625
1626	if (pImage)
1627	uOpenFlags = pImage->uOpenFlags;
1628	else
1629	uOpenFlags = 0;
1630
1631	LogFlowFunc(("returns %#x\n", uOpenFlags));
1632	return uOpenFlags;
1633	}
1634
1635	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
1636	static int vdiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
1637	{
1638	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
1639	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1640	int rc;
1641	const char *pszFilename;
1642
1643	/* Image must be opened and the new flags must be valid. */
1644	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE \| VD_OPEN_FLAGS_SEQUENTIAL)))
1645	{
1646	rc = VERR_INVALID_PARAMETER;
1647	goto out;
1648	}
1649
1650	/* Implement this operation via reopening the image. */
1651	pszFilename = pImage->pszFilename;
1652	rc = vdiFreeImage(pImage, false);
1653	if (RT_FAILURE(rc))
1654	goto out;
1655	rc = vdiOpenImage(pImage, uOpenFlags);
1656
1657	out:
1658	LogFlowFunc(("returns %Rrc\n", rc));
1659	return rc;
1660	}
1661
1662	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1663	static int vdiGetComment(void pBackendData, char pszComment,
1664	size_t cbComment)
1665	{
1666	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
1667	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1668	int rc = VINF_SUCCESS;
1669
1670	AssertPtr(pImage);
1671
1672	if (pImage)
1673	{
1674	char *pszTmp = getImageComment(&pImage->Header);
1675	/* Make this foolproof even if the image doesn't have the zero
1676	* termination. With some luck the repaired header will be saved. */
1677	size_t cb = RTStrNLen(pszTmp, VDI_IMAGE_COMMENT_SIZE);
1678	if (cb == VDI_IMAGE_COMMENT_SIZE)
1679	{
1680	pszTmp[VDI_IMAGE_COMMENT_SIZE-1] = '\0';
1681	cb--;
1682	}
1683	if (cb < cbComment)
1684	{
1685	/* memcpy is much better than strncpy. */
1686	memcpy(pszComment, pszTmp, cb + 1);
1687	}
1688	else
1689	rc = VERR_BUFFER_OVERFLOW;
1690	}
1691	else
1692	rc = VERR_VD_NOT_OPENED;
1693
1694	LogFlowFunc(("returns %Rrc comment=\"%s\"\n", rc, pszComment));
1695	return rc;
1696	}
1697
1698	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1699	static int vdiSetComment(void pBackendData, const char pszComment)
1700	{
1701	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
1702	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1703	int rc;
1704
1705	AssertPtr(pImage);
1706
1707	if (pImage)
1708	{
1709	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1710	rc = VERR_VD_IMAGE_READ_ONLY;
1711	else
1712	{
1713	size_t cchComment = pszComment ? strlen(pszComment) : 0;
1714	if (cchComment >= VDI_IMAGE_COMMENT_SIZE)
1715	{
1716	LogFunc(("pszComment is too long, %d bytes!\n", cchComment));
1717	rc = VERR_VD_VDI_COMMENT_TOO_LONG;
1718	goto out;
1719	}
1720
1721	/* we don't support old style images */
1722	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1723	{
1724	/*
1725	* Update the comment field, making sure to zero out all of the previous comment.
1726	*/
1727	memset(pImage->Header.u.v1.szComment, '\0', VDI_IMAGE_COMMENT_SIZE);
1728	memcpy(pImage->Header.u.v1.szComment, pszComment, cchComment);
1729
1730	/* write out new the header */
1731	rc = vdiUpdateHeader(pImage);
1732	}
1733	else
1734	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1735	}
1736	}
1737	else
1738	rc = VERR_VD_NOT_OPENED;
1739
1740	out:
1741	LogFlowFunc(("returns %Rrc\n", rc));
1742	return rc;
1743	}
1744
1745	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
1746	static int vdiGetUuid(void *pBackendData, PRTUUID pUuid)
1747	{
1748	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1749	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1750	int rc;
1751
1752	AssertPtr(pImage);
1753
1754	if (pImage)
1755	{
1756	pUuid = getImageCreationUUID(&pImage->Header);
1757	rc = VINF_SUCCESS;
1758	}
1759	else
1760	rc = VERR_VD_NOT_OPENED;
1761
1762	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1763	return rc;
1764	}
1765
1766	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
1767	static int vdiSetUuid(void *pBackendData, PCRTUUID pUuid)
1768	{
1769	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1770	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1771	int rc = VINF_SUCCESS;
1772
1773	AssertPtr(pImage);
1774
1775	if (pImage)
1776	{
1777	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1778	{
1779	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1780	pImage->Header.u.v1.uuidCreate = *pUuid;
1781	/* Make it possible to clone old VDIs. */
1782	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1783	pImage->Header.u.v0.uuidCreate = *pUuid;
1784	else
1785	{
1786	LogFunc(("Version is not supported!\n"));
1787	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1788	}
1789	}
1790	else
1791	rc = VERR_VD_IMAGE_READ_ONLY;
1792	}
1793	else
1794	rc = VERR_VD_NOT_OPENED;
1795
1796	LogFlowFunc(("returns %Rrc\n", rc));
1797	return rc;
1798	}
1799
1800	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
1801	static int vdiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
1802	{
1803	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1804	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1805	int rc;
1806
1807	AssertPtr(pImage);
1808
1809	if (pImage)
1810	{
1811	pUuid = getImageModificationUUID(&pImage->Header);
1812	rc = VINF_SUCCESS;
1813	}
1814	else
1815	rc = VERR_VD_NOT_OPENED;
1816
1817	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1818	return rc;
1819	}
1820
1821	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
1822	static int vdiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
1823	{
1824	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1825	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1826	int rc = VINF_SUCCESS;
1827
1828	AssertPtr(pImage);
1829
1830	if (pImage)
1831	{
1832	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1833	{
1834	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1835	pImage->Header.u.v1.uuidModify = *pUuid;
1836	/* Make it possible to clone old VDIs. */
1837	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1838	pImage->Header.u.v0.uuidModify = *pUuid;
1839	else
1840	{
1841	LogFunc(("Version is not supported!\n"));
1842	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1843	}
1844	}
1845	else
1846	rc = VERR_VD_IMAGE_READ_ONLY;
1847	}
1848	else
1849	rc = VERR_VD_NOT_OPENED;
1850
1851	LogFlowFunc(("returns %Rrc\n", rc));
1852	return rc;
1853	}
1854
1855	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
1856	static int vdiGetParentUuid(void *pBackendData, PRTUUID pUuid)
1857	{
1858	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1859	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1860	int rc;
1861
1862	AssertPtr(pImage);
1863
1864	if (pImage)
1865	{
1866	pUuid = getImageParentUUID(&pImage->Header);
1867	rc = VINF_SUCCESS;
1868	}
1869	else
1870	rc = VERR_VD_NOT_OPENED;
1871
1872	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1873	return rc;
1874	}
1875
1876	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
1877	static int vdiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
1878	{
1879	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1880	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1881	int rc = VINF_SUCCESS;
1882
1883	AssertPtr(pImage);
1884
1885	if (pImage)
1886	{
1887	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1888	{
1889	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1890	pImage->Header.u.v1.uuidLinkage = *pUuid;
1891	/* Make it possible to clone old VDIs. */
1892	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1893	pImage->Header.u.v0.uuidLinkage = *pUuid;
1894	else
1895	{
1896	LogFunc(("Version is not supported!\n"));
1897	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1898	}
1899	}
1900	else
1901	rc = VERR_VD_IMAGE_READ_ONLY;
1902	}
1903	else
1904	rc = VERR_VD_NOT_OPENED;
1905
1906	LogFlowFunc(("returns %Rrc\n", rc));
1907	return rc;
1908	}
1909
1910	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
1911	static int vdiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
1912	{
1913	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1914	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1915	int rc;
1916
1917	AssertPtr(pImage);
1918
1919	if (pImage)
1920	{
1921	pUuid = getImageParentModificationUUID(&pImage->Header);
1922	rc = VINF_SUCCESS;
1923	}
1924	else
1925	rc = VERR_VD_NOT_OPENED;
1926
1927	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1928	return rc;
1929	}
1930
1931	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
1932	static int vdiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
1933	{
1934	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1935	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1936	int rc = VINF_SUCCESS;
1937
1938	AssertPtr(pImage);
1939
1940	if (pImage)
1941	{
1942	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1943	{
1944	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1945	pImage->Header.u.v1.uuidParentModify = *pUuid;
1946	else
1947	{
1948	LogFunc(("Version is not supported!\n"));
1949	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1950	}
1951	}
1952	else
1953	rc = VERR_VD_IMAGE_READ_ONLY;
1954	}
1955	else
1956	rc = VERR_VD_NOT_OPENED;
1957
1958	LogFlowFunc(("returns %Rrc\n", rc));
1959	return rc;
1960	}
1961
1962	/** @copydoc VBOXHDDBACKEND::pfnDump */
1963	static void vdiDump(void *pBackendData)
1964	{
1965	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1966
1967	vdiMessage(pImage, "Dumping VDI image \"%s\" mode=%s uOpenFlags=%X File=%#p\n",
1968	pImage->pszFilename,
1969	(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) ? "r/o" : "r/w",
1970	pImage->uOpenFlags,
1971	pImage->pStorage);
1972	vdiMessage(pImage, "Header: Version=%08X Type=%X Flags=%X Size=%llu\n",
1973	pImage->PreHeader.u32Version,
1974	getImageType(&pImage->Header),
1975	getImageFlags(&pImage->Header),
1976	getImageDiskSize(&pImage->Header));
1977	vdiMessage(pImage, "Header: cbBlock=%u cbBlockExtra=%u cBlocks=%u cBlocksAllocated=%u\n",
1978	getImageBlockSize(&pImage->Header),
1979	getImageExtraBlockSize(&pImage->Header),
1980	getImageBlocks(&pImage->Header),
1981	getImageBlocksAllocated(&pImage->Header));
1982	vdiMessage(pImage, "Header: offBlocks=%u offData=%u\n",
1983	getImageBlocksOffset(&pImage->Header),
1984	getImageDataOffset(&pImage->Header));
1985	PVDIDISKGEOMETRY pg = getImageLCHSGeometry(&pImage->Header);
1986	if (pg)
1987	vdiMessage(pImage, "Header: Geometry: C/H/S=%u/%u/%u cbSector=%u\n",
1988	pg->cCylinders, pg->cHeads, pg->cSectors, pg->cbSector);
1989	vdiMessage(pImage, "Header: uuidCreation={%RTuuid}\n", getImageCreationUUID(&pImage->Header));
1990	vdiMessage(pImage, "Header: uuidModification={%RTuuid}\n", getImageModificationUUID(&pImage->Header));
1991	vdiMessage(pImage, "Header: uuidParent={%RTuuid}\n", getImageParentUUID(&pImage->Header));
1992	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) >= 1)
1993	vdiMessage(pImage, "Header: uuidParentModification={%RTuuid}\n", getImageParentModificationUUID(&pImage->Header));
1994	vdiMessage(pImage, "Image: fFlags=%08X offStartBlocks=%u offStartData=%u\n",
1995	pImage->uImageFlags, pImage->offStartBlocks, pImage->offStartData);
1996	vdiMessage(pImage, "Image: uBlockMask=%08X cbTotalBlockData=%u uShiftOffset2Index=%u offStartBlockData=%u\n",
1997	pImage->uBlockMask,
1998	pImage->cbTotalBlockData,
1999	pImage->uShiftOffset2Index,
2000	pImage->offStartBlockData);
2001
2002	unsigned uBlock, cBlocksNotFree, cBadBlocks, cBlocks = getImageBlocks(&pImage->Header);
2003	for (uBlock=0, cBlocksNotFree=0, cBadBlocks=0; uBlock<cBlocks; uBlock++)
2004	{
2005	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2006	{
2007	cBlocksNotFree++;
2008	if (pImage->paBlocks[uBlock] >= cBlocks)
2009	cBadBlocks++;
2010	}
2011	}
2012	if (cBlocksNotFree != getImageBlocksAllocated(&pImage->Header))
2013	{
2014	vdiMessage(pImage, "!! WARNING: %u blocks actually allocated (cBlocksAllocated=%u) !!\n",
2015	cBlocksNotFree, getImageBlocksAllocated(&pImage->Header));
2016	}
2017	if (cBadBlocks)
2018	{
2019	vdiMessage(pImage, "!! WARNING: %u bad blocks found !!\n",
2020	cBadBlocks);
2021	}
2022	}
2023
2024	static int vdiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
2025	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
2026	{
2027	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
2028	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
2029	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2030	unsigned uBlock;
2031	unsigned offRead;
2032	int rc;
2033
2034	AssertPtr(pImage);
2035	Assert(!(uOffset % 512));
2036	Assert(!(cbToRead % 512));
2037
2038	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
2039	\|\| !VALID_PTR(pIoCtx)
2040	\|\| !cbToRead)
2041	{
2042	rc = VERR_INVALID_PARAMETER;
2043	goto out;
2044	}
2045
2046	/* Calculate starting block number and offset inside it. */
2047	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2048	offRead = (unsigned)uOffset & pImage->uBlockMask;
2049
2050	/* Clip read range to at most the rest of the block. */
2051	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
2052	Assert(!(cbToRead % 512));
2053
2054	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
2055	rc = VERR_VD_BLOCK_FREE;
2056	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
2057	{
2058	size_t cbSet;
2059
2060	cbSet = vdiFileIoCtxSet(pImage, pIoCtx, 0, cbToRead);
2061	Assert(cbSet == cbToRead);
2062
2063	rc = VINF_SUCCESS;
2064	}
2065	else
2066	{
2067	/* Block present in image file, read relevant data. */
2068	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2069	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
2070	rc = vdiFileReadUserAsync(pImage, u64Offset, pIoCtx, cbToRead);
2071	}
2072
2073	if (pcbActuallyRead)
2074	*pcbActuallyRead = cbToRead;
2075
2076	out:
2077	LogFlowFunc(("returns %Rrc\n", rc));
2078	return rc;
2079	}
2080
2081	static int vdiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
2082	PVDIOCTX pIoCtx,
2083	size_t pcbWriteProcess, size_t pcbPreRead,
2084	size_t *pcbPostRead, unsigned fWrite)
2085	{
2086	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
2087	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2088	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2089	unsigned uBlock;
2090	unsigned offWrite;
2091	int rc = VINF_SUCCESS;
2092
2093	AssertPtr(pImage);
2094	Assert(!(uOffset % 512));
2095	Assert(!(cbToWrite % 512));
2096
2097	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2098	{
2099	rc = VERR_VD_IMAGE_READ_ONLY;
2100	goto out;
2101	}
2102
2103	if (!VALID_PTR(pIoCtx) \|\| !cbToWrite)
2104	{
2105	rc = VERR_INVALID_PARAMETER;
2106	goto out;
2107	}
2108
2109	/* No size check here, will do that later. For dynamic images which are
2110	* not multiples of the block size in length, this would prevent writing to
2111	* the last block. */
2112
2113	/* Calculate starting block number and offset inside it. */
2114	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2115	offWrite = (unsigned)uOffset & pImage->uBlockMask;
2116
2117	/* Clip write range to at most the rest of the block. */
2118	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
2119	Assert(!(cbToWrite % 512));
2120
2121	do
2122	{
2123	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2124	{
2125	/* Block is either free or zero. */
2126	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
2127	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
2128	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
2129	{
2130	#if 0 /** @todo Provide interface to check an I/O context for a specific value */
2131	/* If the destination block is unallocated at this point, it's
2132	* either a zero block or a block which hasn't been used so far
2133	* (which also means that it's a zero block. Don't need to write
2134	* anything to this block if the data consists of just zeroes. */
2135	Assert(!(cbToWrite % 4));
2136	Assert(cbToWrite * 8 <= UINT32_MAX);
2137	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
2138	{
2139	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
2140	break;
2141	}
2142	#endif
2143	}
2144
2145	if ( cbToWrite == getImageBlockSize(&pImage->Header)
2146	&& !(fWrite & VD_WRITE_NO_ALLOC))
2147	{
2148	/* Full block write to previously unallocated block.
2149	* Allocate block and write data. */
2150	Assert(!offWrite);
2151	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
2152	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
2153	+ (pImage->offStartData + pImage->offStartBlockData);
2154	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2155	if (RT_UNLIKELY(RT_FAILURE_NP(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS)))
2156	goto out;
2157	pImage->paBlocks[uBlock] = cBlocksAllocated;
2158	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
2159
2160	rc = vdiUpdateBlockInfoAsync(pImage, uBlock, pIoCtx);
2161	if (RT_FAILURE(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS))
2162	goto out;
2163
2164	*pcbPreRead = 0;
2165	*pcbPostRead = 0;
2166	}
2167	else
2168	{
2169	/* Trying to do a partial write to an unallocated block. Don't do
2170	* anything except letting the upper layer know what to do. */
2171	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
2172	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
2173	rc = VERR_VD_BLOCK_FREE;
2174	}
2175	}
2176	else
2177	{
2178	/* Block present in image file, write relevant data. */
2179	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2180	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
2181	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2182	}
2183	} while (0);
2184
2185	if (pcbWriteProcess)
2186	*pcbWriteProcess = cbToWrite;
2187
2188	out:
2189	LogFlowFunc(("returns %Rrc\n", rc));
2190	return rc;
2191	}
2192
2193	static int vdiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
2194	{
2195	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2196	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2197	int rc = VINF_SUCCESS;
2198
2199	Assert(pImage);
2200
2201	rc = vdiFlushImageAsync(pImage, pIoCtx);
2202	LogFlowFunc(("returns %Rrc\n", rc));
2203	return rc;
2204	}
2205
2206	/** @copydoc VBOXHDDBACKEND::pfnCompact */
2207	static int vdiCompact(void *pBackendData, unsigned uPercentStart,
2208	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2209	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2210	{
2211	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2212	int rc = VINF_SUCCESS;
2213	void pvBuf = NULL, pvTmp = NULL;
2214	unsigned *paBlocks2 = NULL;
2215
2216	int (pfnParentRead)(void , uint64_t, void *, size_t) = NULL;
2217	void *pvParent = NULL;
2218	PVDINTERFACE pIfParentState = VDInterfaceGet(pVDIfsOperation,
2219	VDINTERFACETYPE_PARENTSTATE);
2220	PVDINTERFACEPARENTSTATE pCbParentState = NULL;
2221	if (pIfParentState)
2222	{
2223	pCbParentState = VDGetInterfaceParentState(pIfParentState);
2224	if (pCbParentState)
2225	pfnParentRead = pCbParentState->pfnParentRead;
2226	pvParent = pIfParentState->pvUser;
2227	}
2228
2229	PFNVDPROGRESS pfnProgress = NULL;
2230	void *pvUser = NULL;
2231	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2232	VDINTERFACETYPE_PROGRESS);
2233	PVDINTERFACEPROGRESS pCbProgress = NULL;
2234	if (pIfProgress)
2235	{
2236	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2237	if (pCbProgress)
2238	pfnProgress = pCbProgress->pfnProgress;
2239	pvUser = pIfProgress->pvUser;
2240	}
2241
2242	do {
2243	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2244
2245	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2246	rc = VERR_VD_IMAGE_READ_ONLY);
2247
2248	unsigned cBlocks;
2249	unsigned cBlocksToMove = 0;
2250	size_t cbBlock;
2251	cBlocks = getImageBlocks(&pImage->Header);
2252	cbBlock = getImageBlockSize(&pImage->Header);
2253	if (pfnParentRead)
2254	{
2255	pvBuf = RTMemTmpAlloc(cbBlock);
2256	AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);
2257	}
2258	pvTmp = RTMemTmpAlloc(cbBlock);
2259	AssertBreakStmt(VALID_PTR(pvTmp), rc = VERR_NO_MEMORY);
2260
2261	uint64_t cbFile;
2262	rc = vdiFileGetSize(pImage, &cbFile);
2263	AssertRCBreak(rc);
2264	unsigned cBlocksAllocated = (unsigned)((cbFile - pImage->offStartData - pImage->offStartBlockData) >> pImage->uShiftOffset2Index);
2265	if (cBlocksAllocated == 0)
2266	{
2267	/* No data blocks in this image, no need to compact. */
2268	rc = VINF_SUCCESS;
2269	break;
2270	}
2271
2272	/* Allocate block array for back resolving. */
2273	paBlocks2 = (unsigned )RTMemAlloc(sizeof(unsigned ) * cBlocksAllocated);
2274	AssertBreakStmt(VALID_PTR(paBlocks2), rc = VERR_NO_MEMORY);
2275	/* Fill out back resolving, check/fix allocation errors before
2276	* compacting the image, just to be on the safe side. Update the
2277	* image contents straight away, as this enables cancelling. */
2278	for (unsigned i = 0; i < cBlocksAllocated; i++)
2279	paBlocks2[i] = VDI_IMAGE_BLOCK_FREE;
2280	rc = VINF_SUCCESS;
2281	for (unsigned i = 0; i < cBlocks; i++)
2282	{
2283	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2284	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2285	{
2286	if (ptrBlock < cBlocksAllocated)
2287	{
2288	if (paBlocks2[ptrBlock] == VDI_IMAGE_BLOCK_FREE)
2289	paBlocks2[ptrBlock] = i;
2290	else
2291	{
2292	LogFunc(("Freed cross-linked block %u in file \"%s\"\n",
2293	i, pImage->pszFilename));
2294	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2295	rc = vdiUpdateBlockInfo(pImage, i);
2296	if (RT_FAILURE(rc))
2297	break;
2298	}
2299	}
2300	else
2301	{
2302	LogFunc(("Freed out of bounds reference for block %u in file \"%s\"\n",
2303	i, pImage->pszFilename));
2304	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2305	rc = vdiUpdateBlockInfo(pImage, i);
2306	if (RT_FAILURE(rc))
2307	break;
2308	}
2309	}
2310	}
2311	if (RT_FAILURE(rc))
2312	break;
2313
2314	/* Find redundant information and update the block pointers
2315	* accordingly, creating bubbles. Keep disk up to date, as this
2316	* enables cancelling. */
2317	for (unsigned i = 0; i < cBlocks; i++)
2318	{
2319	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2320	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2321	{
2322	/* Block present in image file, read relevant data. */
2323	uint64_t u64Offset = (uint64_t)ptrBlock * pImage->cbTotalBlockData
2324	+ (pImage->offStartData + pImage->offStartBlockData);
2325	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2326	if (RT_FAILURE(rc))
2327	break;
2328
2329	if (ASMBitFirstSet((volatile void )pvTmp, (uint32_t)cbBlock 8) == -1)
2330	{
2331	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_ZERO;
2332	rc = vdiUpdateBlockInfo(pImage, i);
2333	if (RT_FAILURE(rc))
2334	break;
2335	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2336	/* Adjust progress info, one block to be relocated. */
2337	cBlocksToMove++;
2338	}
2339	else if (pfnParentRead)
2340	{
2341	rc = pfnParentRead(pvParent, i * cbBlock, pvBuf, cbBlock);
2342	if (RT_FAILURE(rc))
2343	break;
2344	if (!memcmp(pvTmp, pvBuf, cbBlock))
2345	{
2346	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2347	rc = vdiUpdateBlockInfo(pImage, i);
2348	if (RT_FAILURE(rc))
2349	break;
2350	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2351	/* Adjust progress info, one block to be relocated. */
2352	cBlocksToMove++;
2353	}
2354	}
2355	}
2356
2357	if (pCbProgress && pCbProgress->pfnProgress)
2358	{
2359	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2360	(uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2361	if (RT_FAILURE(rc))
2362	break;
2363	}
2364	}
2365	if (RT_FAILURE(rc))
2366	break;
2367
2368	/* Fill bubbles with other data (if available). */
2369	unsigned cBlocksMoved = 0;
2370	unsigned uBlockUsedPos = cBlocksAllocated;
2371	for (unsigned i = 0; i < cBlocksAllocated; i++)
2372	{
2373	unsigned uBlock = paBlocks2[i];
2374	if (uBlock == VDI_IMAGE_BLOCK_FREE)
2375	{
2376	unsigned uBlockData = VDI_IMAGE_BLOCK_FREE;
2377	while (uBlockUsedPos > i && uBlockData == VDI_IMAGE_BLOCK_FREE)
2378	{
2379	uBlockUsedPos--;
2380	uBlockData = paBlocks2[uBlockUsedPos];
2381	}
2382	/* Terminate early if there is no block which needs copying. */
2383	if (uBlockUsedPos == i)
2384	break;
2385	uint64_t u64Offset = (uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2386	+ (pImage->offStartData + pImage->offStartBlockData);
2387	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2388	u64Offset = (uint64_t)i * pImage->cbTotalBlockData
2389	+ (pImage->offStartData + pImage->offStartBlockData);
2390	rc = vdiFileWriteSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2391	pImage->paBlocks[uBlockData] = i;
2392	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated - cBlocksMoved);
2393	rc = vdiUpdateBlockInfo(pImage, uBlockData);
2394	if (RT_FAILURE(rc))
2395	break;
2396	paBlocks2[i] = uBlockData;
2397	paBlocks2[uBlockUsedPos] = VDI_IMAGE_BLOCK_FREE;
2398	cBlocksMoved++;
2399	}
2400
2401	if (pCbProgress && pCbProgress->pfnProgress)
2402	{
2403	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2404	(uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2405
2406	if (RT_FAILURE(rc))
2407	break;
2408	}
2409	}
2410	if (RT_FAILURE(rc))
2411	break;
2412
2413	/* Update image header. */
2414	setImageBlocksAllocated(&pImage->Header, uBlockUsedPos);
2415	vdiUpdateHeader(pImage);
2416
2417	/* Truncate the image to the proper size to finish compacting. */
2418	rc = vdiFileSetSize(pImage,
2419	(uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2420	+ pImage->offStartData + pImage->offStartBlockData);
2421	} while (0);
2422
2423	if (paBlocks2)
2424	RTMemTmpFree(paBlocks2);
2425	if (pvTmp)
2426	RTMemTmpFree(pvTmp);
2427	if (pvBuf)
2428	RTMemTmpFree(pvBuf);
2429
2430	if (RT_SUCCESS(rc) && pCbProgress && pCbProgress->pfnProgress)
2431	{
2432	pCbProgress->pfnProgress(pIfProgress->pvUser,
2433	uPercentStart + uPercentSpan);
2434	}
2435
2436	LogFlowFunc(("returns %Rrc\n", rc));
2437	return rc;
2438	}
2439
2440
2441	/** @copydoc VBOXHDDBACKEND::pfnResize */
2442	static int vdiResize(void *pBackendData, uint64_t cbSize,
2443	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2444	unsigned uPercentStart, unsigned uPercentSpan,
2445	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2446	PVDINTERFACE pVDIfsOperation)
2447	{
2448	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2449	int rc = VINF_SUCCESS;
2450
2451	PFNVDPROGRESS pfnProgress = NULL;
2452	void *pvUser = NULL;
2453	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2454	VDINTERFACETYPE_PROGRESS);
2455	PVDINTERFACEPROGRESS pCbProgress = NULL;
2456	if (pIfProgress)
2457	{
2458	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2459	if (pCbProgress)
2460	pfnProgress = pCbProgress->pfnProgress;
2461	pvUser = pIfProgress->pvUser;
2462	}
2463
2464	/*
2465	* Making the image smaller is not supported at the moment.
2466	* Resizing is also not supported for fixed size images and
2467	* very old images.
2468	*/
2469	/** @todo implement making the image smaller, it is the responsibility of
2470	* the user to know what he's doing. */
2471	if ( cbSize < getImageDiskSize(&pImage->Header)
2472	\|\| GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0
2473	\|\| pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2474	rc = VERR_NOT_SUPPORTED;
2475	else if (cbSize > getImageDiskSize(&pImage->Header))
2476	{
2477	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header); /** < Blocks currently allocated, doesn't change during resize */
2478	uint32_t cBlocksNew = cbSize / getImageBlockSize(&pImage->Header); /** < New number of blocks in the image after the resize */
2479	if (cbSize % getImageBlockSize(&pImage->Header))
2480	cBlocksNew++;
2481
2482	uint32_t cBlocksOld = getImageBlocks(&pImage->Header); /** < Number of blocks before the resize. */
2483	uint64_t cbBlockspaceNew = cBlocksNew * sizeof(VDIIMAGEBLOCKPOINTER); /** < Required space for the block array after the resize. */
2484	uint64_t offStartDataNew = RT_ALIGN_32(pImage->offStartBlocks + cbBlockspaceNew, VDI_DATA_ALIGN); /** < New start offset for block data after the resize */
2485
2486	if ( pImage->offStartData != offStartDataNew
2487	&& cBlocksAllocated > 0)
2488	{
2489	/* Calculate how many sectors need to be relocated. */
2490	uint64_t cbOverlapping = offStartDataNew - pImage->offStartData;
2491	unsigned cBlocksReloc = cbOverlapping / getImageBlockSize(&pImage->Header);
2492	if (cbOverlapping % getImageBlockSize(&pImage->Header))
2493	cBlocksReloc++;
2494
2495	/* Since only full blocks can be relocated the new data start is
2496	* determined by moving it block by block. */
2497	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2498	offStartDataNew = pImage->offStartData;
2499
2500	/* Do the relocation. */
2501	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2502
2503	/*
2504	* Get the blocks we need to relocate first, they are appended to the end
2505	* of the image.
2506	*/
2507	void pvBuf = NULL, pvZero = NULL;
2508	do
2509	{
2510	VDIIMAGEBLOCKPOINTER uBlock = 0;
2511
2512	/* Allocate data buffer. */
2513	pvBuf = RTMemAllocZ(pImage->cbTotalBlockData);
2514	if (!pvBuf)
2515	{
2516	rc = VERR_NO_MEMORY;
2517	break;
2518	}
2519
2520	/* Allocate buffer for overwriting with zeroes. */
2521	pvZero = RTMemAllocZ(pImage->cbTotalBlockData);
2522	if (!pvZero)
2523	{
2524	rc = VERR_NO_MEMORY;
2525	break;
2526	}
2527
2528	for (unsigned i = 0; i < cBlocksReloc; i++)
2529	{
2530	/* Search the index in the block table. */
2531	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2532	{
2533	if (pImage->paBlocks[idxBlock] == uBlock)
2534	{
2535	/* Read data and append to the end of the image. */
2536	rc = vdiFileReadSync(pImage, offStartDataNew, pvBuf, pImage->cbTotalBlockData, NULL);
2537	if (RT_FAILURE(rc))
2538	break;
2539
2540	uint64_t offBlockAppend;
2541	rc = vdiFileGetSize(pImage, &offBlockAppend);
2542	if (RT_FAILURE(rc))
2543	break;
2544
2545	rc = vdiFileWriteSync(pImage, offBlockAppend, pvBuf, pImage->cbTotalBlockData, NULL);
2546	if (RT_FAILURE(rc))
2547	break;
2548
2549	/* Zero out the old block area. */
2550	rc = vdiFileWriteSync(pImage, offStartDataNew, pvZero, pImage->cbTotalBlockData, NULL);
2551	if (RT_FAILURE(rc))
2552	break;
2553
2554	/* Update block counter. */
2555	pImage->paBlocks[idxBlock] = cBlocksAllocated - 1;
2556
2557	/*
2558	* Decrease the block number of all other entries in the array.
2559	* They were moved one block to the front.
2560	* Doing it as a separate step iterating over the array again
2561	* because an error while relocating the block might end up
2562	* in a corrupted image otherwise.
2563	*/
2564	for (unsigned idxBlock2 = 0; idxBlock2 < cBlocksOld; idxBlock2++)
2565	{
2566	if ( idxBlock2 != idxBlock
2567	&& IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[idxBlock2]))
2568	pImage->paBlocks[idxBlock2]--;
2569	}
2570
2571	/* Continue with the next block. */
2572	break;
2573	}
2574	}
2575
2576	if (RT_FAILURE(rc))
2577	break;
2578
2579	uBlock++;
2580	offStartDataNew += pImage->cbTotalBlockData;
2581	}
2582	} while (0);
2583
2584	if (pvBuf)
2585	RTMemFree(pvBuf);
2586	if (pvZero)
2587	RTMemFree(pvZero);
2588	}
2589
2590	/*
2591	* We need to update the new offsets for the image data in the out of memory
2592	* case too because we relocated the blocks already.
2593	*/
2594	pImage->offStartData = offStartDataNew;
2595	setImageDataOffset(&pImage->Header, offStartDataNew);
2596
2597	/*
2598	* Relocation done, expand the block array and update the header with
2599	* the new data.
2600	*/
2601	if (RT_SUCCESS(rc))
2602	{
2603	PVDIIMAGEBLOCKPOINTER paBlocksNew = (PVDIIMAGEBLOCKPOINTER)RTMemRealloc(pImage->paBlocks, cbBlockspaceNew);
2604	if (paBlocksNew)
2605	{
2606	pImage->paBlocks = paBlocksNew;
2607
2608	/* Mark the new blocks as unallocated. */
2609	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
2610	pImage->paBlocks[idxBlock] = VDI_IMAGE_BLOCK_FREE;
2611	}
2612	else
2613	rc = VERR_NO_MEMORY;
2614
2615	/* Write the block array before updating the rest. */
2616	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
2617	cbBlockspaceNew, NULL);
2618
2619	if (RT_SUCCESS(rc))
2620	{
2621	/* Update size and new block count. */
2622	setImageDiskSize(&pImage->Header, cbSize);
2623	setImageBlocks(&pImage->Header, cBlocksNew);
2624	/* Update geometry. */
2625	pImage->PCHSGeometry = *pPCHSGeometry;
2626
2627	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
2628	if (pGeometry)
2629	{
2630	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
2631	pGeometry->cHeads = pLCHSGeometry->cHeads;
2632	pGeometry->cSectors = pLCHSGeometry->cSectors;
2633	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
2634	}
2635	}
2636	}
2637
2638	/* Update header information in base image file. */
2639	vdiFlushImage(pImage);
2640	}
2641	/* Same size doesn't change the image at all. */
2642
2643	LogFlowFunc(("returns %Rrc\n", rc));
2644	return rc;
2645	}
2646
2647
2648	VBOXHDDBACKEND g_VDIBackend =
2649	{
2650	/* pszBackendName */
2651	"VDI",
2652	/* cbSize */
2653	sizeof(VBOXHDDBACKEND),
2654	/* uBackendCaps */
2655	VD_CAP_UUID \| VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC
2656	\| VD_CAP_DIFF \| VD_CAP_FILE \| VD_CAP_ASYNC \| VD_CAP_VFS,
2657	/* paFileExtensions */
2658	s_aVdiFileExtensions,
2659	/* paConfigInfo */
2660	NULL,
2661	/* hPlugin */
2662	NIL_RTLDRMOD,
2663	/* pfnCheckIfValid */
2664	vdiCheckIfValid,
2665	/* pfnOpen */
2666	vdiOpen,
2667	/* pfnCreate */
2668	vdiCreate,
2669	/* pfnRename */
2670	vdiRename,
2671	/* pfnClose */
2672	vdiClose,
2673	/* pfnRead */
2674	vdiRead,
2675	/* pfnWrite */
2676	vdiWrite,
2677	/* pfnFlush */
2678	vdiFlush,
2679	/* pfnGetVersion */
2680	vdiGetVersion,
2681	/* pfnGetSize */
2682	vdiGetSize,
2683	/* pfnGetFileSize */
2684	vdiGetFileSize,
2685	/* pfnGetPCHSGeometry */
2686	vdiGetPCHSGeometry,
2687	/* pfnSetPCHSGeometry */
2688	vdiSetPCHSGeometry,
2689	/* pfnGetLCHSGeometry */
2690	vdiGetLCHSGeometry,
2691	/* pfnSetLCHSGeometry */
2692	vdiSetLCHSGeometry,
2693	/* pfnGetImageFlags */
2694	vdiGetImageFlags,
2695	/* pfnGetOpenFlags */
2696	vdiGetOpenFlags,
2697	/* pfnSetOpenFlags */
2698	vdiSetOpenFlags,
2699	/* pfnGetComment */
2700	vdiGetComment,
2701	/* pfnSetComment */
2702	vdiSetComment,
2703	/* pfnGetUuid */
2704	vdiGetUuid,
2705	/* pfnSetUuid */
2706	vdiSetUuid,
2707	/* pfnGetModificationUuid */
2708	vdiGetModificationUuid,
2709	/* pfnSetModificationUuid */
2710	vdiSetModificationUuid,
2711	/* pfnGetParentUuid */
2712	vdiGetParentUuid,
2713	/* pfnSetParentUuid */
2714	vdiSetParentUuid,
2715	/* pfnGetParentModificationUuid */
2716	vdiGetParentModificationUuid,
2717	/* pfnSetParentModificationUuid */
2718	vdiSetParentModificationUuid,
2719	/* pfnDump */
2720	vdiDump,
2721	/* pfnGetTimeStamp */
2722	NULL,
2723	/* pfnGetParentTimeStamp */
2724	NULL,
2725	/* pfnSetParentTimeStamp */
2726	NULL,
2727	/* pfnGetParentFilename */
2728	NULL,
2729	/* pfnSetParentFilename */
2730	NULL,
2731	/* pfnAsyncRead */
2732	vdiAsyncRead,
2733	/* pfnAsyncWrite */
2734	vdiAsyncWrite,
2735	/* pfnAsyncFlush */
2736	vdiAsyncFlush,
2737	/* pfnComposeLocation */
2738	genericFileComposeLocation,
2739	/* pfnComposeName */
2740	genericFileComposeName,
2741	/* pfnCompact */
2742	vdiCompact,
2743	/* pfnResize */
2744	vdiResize
2745	};

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source: vbox/trunk/src/VBox/Storage/VDI.cpp@ 37423

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