VDIHDDCore.cpp@ 33081

Last change on this file since 33081 was 33081, checked in by vboxsync, 14 years ago
Storage/VDI: fix a sneaky bug which led to temporary amnesia what the LCHS geometry is set for a newly created image
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 95.0 KB

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1	/** @file
2	* Virtual Disk Image (VDI), Core Code.
3	*/
4
5	/*
6	* Copyright (C) 2006-2010 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/VBoxHDD-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 char *const s_apszVdiFileExtensions[] =
41	{
42	"vdi",
43	NULL
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-dependend 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 modificator 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	goto out;
714	}
715
716	uOff += cbChunk;
717
718	if (pfnProgress)
719	{
720	rc = pfnProgress(pvUser,
721	uPercentStart + uOff * uPercentSpan / cbFill);
722	if (RT_FAILURE(rc))
723	goto out;
724	}
725	}
726	RTMemTmpFree(pvBuf);
727	}
728
729	out:
730	if (RT_SUCCESS(rc) && pfnProgress)
731	pfnProgress(pvUser, uPercentStart + uPercentSpan);
732
733	if (RT_FAILURE(rc))
734	vdiFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
735	return rc;
736	}
737
738	/**
739	* Internal: Open a VDI image.
740	*/
741	static int vdiOpenImage(PVDIIMAGEDESC pImage, unsigned uOpenFlags)
742	{
743	int rc;
744
745	pImage->uOpenFlags = uOpenFlags;
746
747	pImage->pInterfaceError = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_ERROR);
748	if (pImage->pInterfaceError)
749	pImage->pInterfaceErrorCallbacks = VDGetInterfaceError(pImage->pInterfaceError);
750
751	/* Get I/O interface. */
752	pImage->pInterfaceIO = VDInterfaceGet(pImage->pVDIfsImage, VDINTERFACETYPE_IOINT);
753	AssertPtrReturn(pImage->pInterfaceIO, VERR_INVALID_PARAMETER);
754	pImage->pInterfaceIOCallbacks = VDGetInterfaceIOInt(pImage->pInterfaceIO);
755	AssertPtrReturn(pImage->pInterfaceIOCallbacks, VERR_INVALID_PARAMETER);
756
757	/*
758	* Open the image.
759	*/
760	rc = vdiFileOpen(pImage, pImage->pszFilename,
761	VDOpenFlagsToFileOpenFlags(uOpenFlags, false /* fCreate */));
762	if (RT_FAILURE(rc))
763	{
764	/* Do NOT signal an appropriate error here, as the VD layer has the
765	* choice of retrying the open if it failed. */
766	goto out;
767	}
768
769	/* Read pre-header. */
770	rc = vdiFileReadSync(pImage, 0, &pImage->PreHeader, sizeof(pImage->PreHeader), NULL);
771	if (RT_FAILURE(rc))
772	{
773	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading pre-header in '%s'"), pImage->pszFilename);
774	goto out;
775	}
776	rc = vdiValidatePreHeader(&pImage->PreHeader);
777	if (RT_FAILURE(rc))
778	{
779	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: invalid pre-header in '%s'"), pImage->pszFilename);
780	goto out;
781	}
782
783	/* Read header. */
784	pImage->Header.uVersion = pImage->PreHeader.u32Version;
785	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
786	{
787	case 0:
788	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
789	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
790	NULL);
791	if (RT_FAILURE(rc))
792	{
793	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v0 header in '%s'"), pImage->pszFilename);
794	goto out;
795	}
796	break;
797	case 1:
798	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
799	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
800	NULL);
801	if (RT_FAILURE(rc))
802	{
803	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1 header in '%s'"), pImage->pszFilename);
804	goto out;
805	}
806	/* Convert VDI 1.1 images to VDI 1.1+ on open in read/write mode.
807	* Conversion is harmless, as any VirtualBox version supporting VDI
808	* 1.1 doesn't touch fields it doesn't know about. */
809	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
810	&& GET_MINOR_HEADER_VERSION(&pImage->Header) == 1
811	&& pImage->Header.u.v1.cbHeader < sizeof(pImage->Header.u.v1plus))
812	{
813	pImage->Header.u.v1plus.cbHeader = sizeof(pImage->Header.u.v1plus);
814	/* Mark LCHS geometry not-calculated. */
815	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = 0;
816	pImage->Header.u.v1plus.LCHSGeometry.cHeads = 0;
817	pImage->Header.u.v1plus.LCHSGeometry.cSectors = 0;
818	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
819	}
820	else if (pImage->Header.u.v1.cbHeader >= sizeof(pImage->Header.u.v1plus))
821	{
822	/* Read the actual VDI 1.1+ header completely. */
823	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
824	&pImage->Header.u.v1plus,
825	sizeof(pImage->Header.u.v1plus), NULL);
826	if (RT_FAILURE(rc))
827	{
828	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1.1+ header in '%s'"), pImage->pszFilename);
829	goto out;
830	}
831	}
832	break;
833	default:
834	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);
835	goto out;
836	}
837
838	rc = vdiValidateHeader(&pImage->Header);
839	if (RT_FAILURE(rc))
840	{
841	rc = vdiError(pImage, VERR_VD_VDI_INVALID_HEADER, RT_SRC_POS, N_("VDI: invalid header in '%s'"), pImage->pszFilename);
842	goto out;
843	}
844
845	/* Setup image parameters by header. */
846	vdiSetupImageDesc(pImage);
847
848	/* Allocate memory for blocks array. */
849	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
850	if (!pImage->paBlocks)
851	{
852	rc = VERR_NO_MEMORY;
853	goto out;
854	}
855
856	/* Read blocks array. */
857	rc = vdiFileReadSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
858	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
859	NULL);
860
861	out:
862	if (RT_FAILURE(rc))
863	vdiFreeImage(pImage, false);
864	return rc;
865	}
866
867	/**
868	* Internal: Save header to file.
869	*/
870	static int vdiUpdateHeader(PVDIIMAGEDESC pImage)
871	{
872	int rc;
873	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
874	{
875	case 0:
876	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
877	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
878	NULL);
879	break;
880	case 1:
881	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
882	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
883	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
884	NULL);
885	else
886	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
887	&pImage->Header.u.v1plus, sizeof(pImage->Header.u.v1plus),
888	NULL);
889	break;
890	default:
891	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
892	break;
893	}
894	AssertMsgRC(rc, ("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
895	return rc;
896	}
897
898	/**
899	* Internal: Save header to file - async version.
900	*/
901	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
902	{
903	int rc;
904	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
905	{
906	case 0:
907	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
908	&pImage->Header.u.v0,
909	sizeof(pImage->Header.u.v0),
910	pIoCtx, NULL, NULL);
911	break;
912	case 1:
913	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
914	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
915	&pImage->Header.u.v1,
916	sizeof(pImage->Header.u.v1),
917	pIoCtx, NULL, NULL);
918	else
919	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
920	&pImage->Header.u.v1plus,
921	sizeof(pImage->Header.u.v1plus),
922	pIoCtx, NULL, NULL);
923	break;
924	default:
925	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
926	break;
927	}
928	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
929	("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
930	return rc;
931	}
932
933	/**
934	* Internal: Save block pointer to file, save header to file.
935	*/
936	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock)
937	{
938	/* Update image header. */
939	int rc = vdiUpdateHeader(pImage);
940	if (RT_SUCCESS(rc))
941	{
942	/* write only one block pointer. */
943	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
944	&pImage->paBlocks[uBlock], sizeof(VDIIMAGEBLOCKPOINTER),
945	NULL);
946	AssertMsgRC(rc, ("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
947	uBlock, pImage->pszFilename, rc));
948	}
949	return rc;
950	}
951
952	/**
953	* Internal: Save block pointer to file, save header to file - async version.
954	*/
955	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock,
956	PVDIOCTX pIoCtx)
957	{
958	/* Update image header. */
959	int rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
960	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
961	{
962	/* write only one block pointer. */
963	rc = vdiFileWriteMetaAsync(pImage,
964	pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
965	&pImage->paBlocks[uBlock],
966	sizeof(VDIIMAGEBLOCKPOINTER),
967	pIoCtx, NULL, NULL);
968	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
969	("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
970	uBlock, pImage->pszFilename, rc));
971	}
972	return rc;
973	}
974
975	/**
976	* Internal: Flush the image file to disk - async version.
977	*/
978	static int vdiFlushImageAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
979	{
980	int rc = VINF_SUCCESS;
981
982	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
983	{
984	/* Save header. */
985	rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
986	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
987	("vdiUpdateHeaderAsync() failed, filename=\"%s\", rc=%Rrc\n",
988	pImage->pszFilename, rc));
989	rc = vdiFileFlushAsync(pImage, pIoCtx, NULL, NULL);
990	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
991	("Flushing data to disk failed rc=%Rrc\n", rc));
992	}
993
994	return rc;
995	}
996
997
998	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
999	static int vdiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1000	PVDINTERFACE pVDIfsImage)
1001	{
1002	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
1003	int rc = VINF_SUCCESS;
1004	PVDIIMAGEDESC pImage;
1005
1006	if ( !VALID_PTR(pszFilename)
1007	\|\| !*pszFilename)
1008	{
1009	rc = VERR_INVALID_PARAMETER;
1010	goto out;
1011	}
1012
1013	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1014	if (!pImage)
1015	{
1016	rc = VERR_NO_MEMORY;
1017	goto out;
1018	}
1019	pImage->pszFilename = pszFilename;
1020	pImage->pStorage = NULL;
1021	pImage->paBlocks = NULL;
1022	pImage->pVDIfsDisk = pVDIfsDisk;
1023	pImage->pVDIfsImage = pVDIfsImage;
1024
1025	rc = vdiOpenImage(pImage, VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_READONLY);
1026	vdiFreeImage(pImage, false);
1027	RTMemFree(pImage);
1028
1029	out:
1030	LogFlowFunc(("returns %Rrc\n", rc));
1031	return rc;
1032	}
1033
1034	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1035	static int vdiOpen(const char *pszFilename, unsigned uOpenFlags,
1036	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1037	void **ppBackendData)
1038	{
1039	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
1040	int rc;
1041	PVDIIMAGEDESC pImage;
1042
1043	/* Check open flags. All valid flags are supported. */
1044	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1045	{
1046	rc = VERR_INVALID_PARAMETER;
1047	goto out;
1048	}
1049
1050	/* Check remaining arguments. */
1051	if ( !VALID_PTR(pszFilename)
1052	\|\| !*pszFilename)
1053	{
1054	rc = VERR_INVALID_PARAMETER;
1055	goto out;
1056	}
1057
1058	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1059	if (!pImage)
1060	{
1061	rc = VERR_NO_MEMORY;
1062	goto out;
1063	}
1064	pImage->pszFilename = pszFilename;
1065	pImage->pStorage = NULL;
1066	pImage->paBlocks = NULL;
1067	pImage->pVDIfsDisk = pVDIfsDisk;
1068	pImage->pVDIfsImage = pVDIfsImage;
1069
1070	rc = vdiOpenImage(pImage, uOpenFlags);
1071	if (RT_SUCCESS(rc))
1072	*ppBackendData = pImage;
1073
1074	out:
1075	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1076	return rc;
1077	}
1078
1079	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1080	static int vdiCreate(const char *pszFilename, uint64_t cbSize,
1081	unsigned uImageFlags, const char *pszComment,
1082	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1083	PCRTUUID pUuid, unsigned uOpenFlags,
1084	unsigned uPercentStart, unsigned uPercentSpan,
1085	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1086	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
1087	{
1088	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));
1089	int rc;
1090	PVDIIMAGEDESC pImage;
1091
1092	PFNVDPROGRESS pfnProgress = NULL;
1093	void *pvUser = NULL;
1094	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
1095	VDINTERFACETYPE_PROGRESS);
1096	PVDINTERFACEPROGRESS pCbProgress = NULL;
1097	if (pIfProgress)
1098	{
1099	pCbProgress = VDGetInterfaceProgress(pIfProgress);
1100	if (pCbProgress)
1101	pfnProgress = pCbProgress->pfnProgress;
1102	pvUser = pIfProgress->pvUser;
1103	}
1104
1105	/* Check open flags. All valid flags are supported. */
1106	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1107	{
1108	rc = VERR_INVALID_PARAMETER;
1109	goto out;
1110	}
1111
1112	/* Check size. Maximum 4PB-3M. No tricks with adjusting the 1M block size
1113	* so far, which would extend the size. */
1114	cbSize = RT_ALIGN_64(cbSize, _1M);
1115	if ( !cbSize
1116	\|\| cbSize >= _1P * 2 - _1M * 3)
1117	{
1118	rc = VERR_VD_INVALID_SIZE;
1119	goto out;
1120	}
1121
1122	/* Check remaining arguments. */
1123	if ( !VALID_PTR(pszFilename)
1124	\|\| !*pszFilename
1125	\|\| cbSize < VDI_IMAGE_DEFAULT_BLOCK_SIZE
1126	\|\| !VALID_PTR(pPCHSGeometry)
1127	\|\| !VALID_PTR(pLCHSGeometry))
1128	{
1129	rc = VERR_INVALID_PARAMETER;
1130	goto out;
1131	}
1132
1133	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1134	if (!pImage)
1135	{
1136	rc = VERR_NO_MEMORY;
1137	goto out;
1138	}
1139	pImage->pszFilename = pszFilename;
1140	pImage->pStorage = NULL;
1141	pImage->paBlocks = NULL;
1142	pImage->pVDIfsDisk = pVDIfsDisk;
1143	pImage->pVDIfsImage = pVDIfsImage;
1144
1145	rc = vdiCreateImage(pImage, cbSize, uImageFlags, pszComment,
1146	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1147	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1148	if (RT_SUCCESS(rc))
1149	{
1150	/* So far the image is opened in read/write mode. Make sure the
1151	* image is opened in read-only mode if the caller requested that. */
1152	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1153	{
1154	vdiFreeImage(pImage, false);
1155	rc = vdiOpenImage(pImage, uOpenFlags);
1156	if (RT_FAILURE(rc))
1157	{
1158	RTMemFree(pImage);
1159	goto out;
1160	}
1161	}
1162	*ppBackendData = pImage;
1163	}
1164	else
1165	RTMemFree(pImage);
1166
1167	out:
1168	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1169	return rc;
1170	}
1171
1172	/** @copydoc VBOXHDDBACKEND::pfnRename */
1173	static int vdiRename(void pBackendData, const char pszFilename)
1174	{
1175	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1176
1177	int rc = VINF_SUCCESS;
1178	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1179
1180	/* Check arguments. */
1181	if ( !pImage
1182	\|\| !pszFilename
1183	\|\| !*pszFilename)
1184	{
1185	rc = VERR_INVALID_PARAMETER;
1186	goto out;
1187	}
1188
1189	/* Close the image. */
1190	vdiFreeImage(pImage, false);
1191
1192	/* Rename the file. */
1193	rc = vdiFileMove(pImage, pImage->pszFilename, pszFilename, 0);
1194	if (RT_FAILURE(rc))
1195	{
1196	/* The move failed, try to reopen the original image. */
1197	int rc2 = vdiOpenImage(pImage, pImage->uOpenFlags);
1198	if (RT_FAILURE(rc2))
1199	rc = rc2;
1200
1201	goto out;
1202	}
1203
1204	/* Update pImage with the new information. */
1205	pImage->pszFilename = pszFilename;
1206
1207	/* Open the new image. */
1208	rc = vdiOpenImage(pImage, pImage->uOpenFlags);
1209	if (RT_FAILURE(rc))
1210	goto out;
1211
1212	out:
1213	LogFlowFunc(("returns %Rrc\n", rc));
1214	return rc;
1215	}
1216
1217	/** @copydoc VBOXHDDBACKEND::pfnClose */
1218	static int vdiClose(void *pBackendData, bool fDelete)
1219	{
1220	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1221	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1222	int rc;
1223
1224	rc = vdiFreeImage(pImage, fDelete);
1225	RTMemFree(pImage);
1226
1227	LogFlowFunc(("returns %Rrc\n", rc));
1228	return rc;
1229	}
1230
1231	/** @copydoc VBOXHDDBACKEND::pfnRead */
1232	static int vdiRead(void pBackendData, uint64_t uOffset, void pvBuf,
1233	size_t cbToRead, size_t *pcbActuallyRead)
1234	{
1235	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
1236	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1237	unsigned uBlock;
1238	unsigned offRead;
1239	int rc;
1240
1241	AssertPtr(pImage);
1242	Assert(!(uOffset % 512));
1243	Assert(!(cbToRead % 512));
1244
1245	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
1246	\|\| !VALID_PTR(pvBuf)
1247	\|\| !cbToRead)
1248	{
1249	rc = VERR_INVALID_PARAMETER;
1250	goto out;
1251	}
1252
1253	/* Calculate starting block number and offset inside it. */
1254	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1255	offRead = (unsigned)uOffset & pImage->uBlockMask;
1256
1257	/* Clip read range to at most the rest of the block. */
1258	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
1259	Assert(!(cbToRead % 512));
1260
1261	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
1262	rc = VERR_VD_BLOCK_FREE;
1263	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
1264	{
1265	memset(pvBuf, 0, cbToRead);
1266	rc = VINF_SUCCESS;
1267	}
1268	else
1269	{
1270	/* Block present in image file, read relevant data. */
1271	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1272	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
1273	rc = vdiFileReadSync(pImage, u64Offset, pvBuf, cbToRead, NULL);
1274	}
1275
1276	if (pcbActuallyRead)
1277	*pcbActuallyRead = cbToRead;
1278
1279	out:
1280	LogFlowFunc(("returns %Rrc\n", rc));
1281	return rc;
1282	}
1283
1284	/*@copydoc VBOXHDDBACKEND::pfnWrite /
1285	static int vdiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
1286	size_t cbToWrite, size_t *pcbWriteProcess,
1287	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
1288	{
1289	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1290	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1291	unsigned uBlock;
1292	unsigned offWrite;
1293	int rc = VINF_SUCCESS;
1294
1295	AssertPtr(pImage);
1296	Assert(!(uOffset % 512));
1297	Assert(!(cbToWrite % 512));
1298
1299	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1300	{
1301	rc = VERR_VD_IMAGE_READ_ONLY;
1302	goto out;
1303	}
1304
1305	if (!VALID_PTR(pvBuf) \|\| !cbToWrite)
1306	{
1307	rc = VERR_INVALID_PARAMETER;
1308	goto out;
1309	}
1310
1311	/* No size check here, will do that later. For dynamic images which are
1312	* not multiples of the block size in length, this would prevent writing to
1313	* the last block. */
1314
1315	/* Calculate starting block number and offset inside it. */
1316	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1317	offWrite = (unsigned)uOffset & pImage->uBlockMask;
1318
1319	/* Clip write range to at most the rest of the block. */
1320	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
1321	Assert(!(cbToWrite % 512));
1322
1323	do
1324	{
1325	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
1326	{
1327	/* Block is either free or zero. */
1328	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
1329	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
1330	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
1331	{
1332	/* If the destination block is unallocated at this point, it's
1333	* either a zero block or a block which hasn't been used so far
1334	* (which also means that it's a zero block. Don't need to write
1335	* anything to this block if the data consists of just zeroes. */
1336	Assert(!(cbToWrite % 4));
1337	Assert(cbToWrite * 8 <= UINT32_MAX);
1338	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
1339	{
1340	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
1341	break;
1342	}
1343	}
1344
1345	if (cbToWrite == getImageBlockSize(&pImage->Header))
1346	{
1347	/* Full block write to previously unallocated block.
1348	* Allocate block and write data. */
1349	Assert(!offWrite);
1350	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
1351	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
1352	+ (pImage->offStartData + pImage->offStartBlockData);
1353	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1354	if (RT_FAILURE(rc))
1355	goto out;
1356	pImage->paBlocks[uBlock] = cBlocksAllocated;
1357	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
1358
1359	rc = vdiUpdateBlockInfo(pImage, uBlock);
1360	if (RT_FAILURE(rc))
1361	goto out;
1362
1363	*pcbPreRead = 0;
1364	*pcbPostRead = 0;
1365	}
1366	else
1367	{
1368	/* Trying to do a partial write to an unallocated block. Don't do
1369	* anything except letting the upper layer know what to do. */
1370	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
1371	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
1372	rc = VERR_VD_BLOCK_FREE;
1373	}
1374	}
1375	else
1376	{
1377	/* Block present in image file, write relevant data. */
1378	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1379	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
1380	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1381	}
1382	} while (0);
1383
1384	if (pcbWriteProcess)
1385	*pcbWriteProcess = cbToWrite;
1386
1387	out:
1388	LogFlowFunc(("returns %Rrc\n", rc));
1389	return rc;
1390	}
1391
1392	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1393	static int vdiFlush(void *pBackendData)
1394	{
1395	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1396	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1397	int rc = VINF_SUCCESS;
1398
1399	Assert(pImage);
1400
1401	vdiFlushImage(pImage);
1402	LogFlowFunc(("returns %Rrc\n", rc));
1403	return rc;
1404	}
1405
1406	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
1407	static unsigned vdiGetVersion(void *pBackendData)
1408	{
1409	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1410	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1411	unsigned uVersion;
1412
1413	AssertPtr(pImage);
1414
1415	if (pImage)
1416	uVersion = pImage->PreHeader.u32Version;
1417	else
1418	uVersion = 0;
1419
1420	LogFlowFunc(("returns %#x\n", uVersion));
1421	return uVersion;
1422	}
1423
1424	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
1425	static uint64_t vdiGetSize(void *pBackendData)
1426	{
1427	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1428	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1429	uint64_t cbSize;
1430
1431	AssertPtr(pImage);
1432
1433	if (pImage)
1434	cbSize = getImageDiskSize(&pImage->Header);
1435	else
1436	cbSize = 0;
1437
1438	LogFlowFunc(("returns %llu\n", cbSize));
1439	return cbSize;
1440	}
1441
1442	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
1443	static uint64_t vdiGetFileSize(void *pBackendData)
1444	{
1445	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1446	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1447	uint64_t cb = 0;
1448
1449	AssertPtr(pImage);
1450
1451	if (pImage)
1452	{
1453	uint64_t cbFile;
1454	if (pImage->pStorage)
1455	{
1456	int rc = vdiFileGetSize(pImage, &cbFile);
1457	if (RT_SUCCESS(rc))
1458	cb += cbFile;
1459	}
1460	}
1461
1462	LogFlowFunc(("returns %lld\n", cb));
1463	return cb;
1464	}
1465
1466	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
1467	static int vdiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1468	{
1469	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1470	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1471	int rc;
1472
1473	AssertPtr(pImage);
1474
1475	if (pImage)
1476	{
1477	if (pImage->PCHSGeometry.cCylinders)
1478	{
1479	*pPCHSGeometry = pImage->PCHSGeometry;
1480	rc = VINF_SUCCESS;
1481	}
1482	else
1483	rc = VERR_VD_GEOMETRY_NOT_SET;
1484	}
1485	else
1486	rc = VERR_VD_NOT_OPENED;
1487
1488	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1489	return rc;
1490	}
1491
1492	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
1493	static int vdiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1494	{
1495	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1496	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1497	int rc;
1498
1499	AssertPtr(pImage);
1500
1501	if (pImage)
1502	{
1503	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1504	{
1505	rc = VERR_VD_IMAGE_READ_ONLY;
1506	goto out;
1507	}
1508
1509	pImage->PCHSGeometry = *pPCHSGeometry;
1510	rc = VINF_SUCCESS;
1511	}
1512	else
1513	rc = VERR_VD_NOT_OPENED;
1514
1515	out:
1516	LogFlowFunc(("returns %Rrc\n", rc));
1517	return rc;
1518	}
1519
1520	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
1521	static int vdiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1522	{
1523	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1524	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1525	int rc;
1526
1527	AssertPtr(pImage);
1528
1529	if (pImage)
1530	{
1531	VDIDISKGEOMETRY DummyGeo = { 0, 0, 0, VDI_GEOMETRY_SECTOR_SIZE };
1532	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
1533	if (!pGeometry)
1534	pGeometry = &DummyGeo;
1535
1536	if ( pGeometry->cCylinders > 0
1537	&& pGeometry->cHeads > 0
1538	&& pGeometry->cSectors > 0)
1539	{
1540	pLCHSGeometry->cCylinders = pGeometry->cCylinders;
1541	pLCHSGeometry->cHeads = pGeometry->cHeads;
1542	pLCHSGeometry->cSectors = pGeometry->cSectors;
1543	rc = VINF_SUCCESS;
1544	}
1545	else
1546	rc = VERR_VD_GEOMETRY_NOT_SET;
1547	}
1548	else
1549	rc = VERR_VD_NOT_OPENED;
1550
1551	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1552	return rc;
1553	}
1554
1555	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
1556	static int vdiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1557	{
1558	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1559	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1560	PVDIDISKGEOMETRY pGeometry;
1561	int rc;
1562
1563	AssertPtr(pImage);
1564
1565	if (pImage)
1566	{
1567	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1568	{
1569	rc = VERR_VD_IMAGE_READ_ONLY;
1570	goto out;
1571	}
1572
1573	pGeometry = getImageLCHSGeometry(&pImage->Header);
1574	if (pGeometry)
1575	{
1576	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
1577	pGeometry->cHeads = pLCHSGeometry->cHeads;
1578	pGeometry->cSectors = pLCHSGeometry->cSectors;
1579	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
1580
1581	/* Update header information in base image file. */
1582	vdiFlushImage(pImage);
1583	}
1584	rc = VINF_SUCCESS;
1585	}
1586	else
1587	rc = VERR_VD_NOT_OPENED;
1588
1589	out:
1590	LogFlowFunc(("returns %Rrc\n", rc));
1591	return rc;
1592	}
1593
1594	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
1595	static unsigned vdiGetImageFlags(void *pBackendData)
1596	{
1597	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1598	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1599	unsigned uImageFlags;
1600
1601	AssertPtr(pImage);
1602
1603	if (pImage)
1604	uImageFlags = pImage->uImageFlags;
1605	else
1606	uImageFlags = 0;
1607
1608	LogFlowFunc(("returns %#x\n", uImageFlags));
1609	return uImageFlags;
1610	}
1611
1612	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
1613	static unsigned vdiGetOpenFlags(void *pBackendData)
1614	{
1615	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1616	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1617	unsigned uOpenFlags;
1618
1619	AssertPtr(pImage);
1620
1621	if (pImage)
1622	uOpenFlags = pImage->uOpenFlags;
1623	else
1624	uOpenFlags = 0;
1625
1626	LogFlowFunc(("returns %#x\n", uOpenFlags));
1627	return uOpenFlags;
1628	}
1629
1630	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
1631	static int vdiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
1632	{
1633	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
1634	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1635	int rc;
1636	const char *pszFilename;
1637
1638	/* Image must be opened and the new flags must be valid. Just readonly and
1639	* info flags are supported. */
1640	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE)))
1641	{
1642	rc = VERR_INVALID_PARAMETER;
1643	goto out;
1644	}
1645
1646	/* Implement this operation via reopening the image. */
1647	pszFilename = pImage->pszFilename;
1648	rc = vdiFreeImage(pImage, false);
1649	if (RT_FAILURE(rc))
1650	goto out;
1651	rc = vdiOpenImage(pImage, uOpenFlags);
1652
1653	out:
1654	LogFlowFunc(("returns %Rrc\n", rc));
1655	return rc;
1656	}
1657
1658	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1659	static int vdiGetComment(void pBackendData, char pszComment,
1660	size_t cbComment)
1661	{
1662	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
1663	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1664	int rc = VINF_SUCCESS;
1665
1666	AssertPtr(pImage);
1667
1668	if (pImage)
1669	{
1670	char *pszTmp = getImageComment(&pImage->Header);
1671	size_t cb = strlen(pszTmp);
1672	if (cb < cbComment)
1673	{
1674	/* memcpy is much better than strncpy. */
1675	memcpy(pszComment, pszTmp, cb + 1);
1676	}
1677	else
1678	rc = VERR_BUFFER_OVERFLOW;
1679	}
1680	else
1681	rc = VERR_VD_NOT_OPENED;
1682
1683	LogFlowFunc(("returns %Rrc comment=\"%s\"\n", rc, pszComment));
1684	return rc;
1685	}
1686
1687	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1688	static int vdiSetComment(void pBackendData, const char pszComment)
1689	{
1690	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
1691	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1692	int rc;
1693
1694	AssertPtr(pImage);
1695
1696	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1697	{
1698	rc = VERR_VD_IMAGE_READ_ONLY;
1699	goto out;
1700	}
1701
1702	if (pImage)
1703	{
1704	size_t cchComment = pszComment ? strlen(pszComment) : 0;
1705	if (cchComment >= VDI_IMAGE_COMMENT_SIZE)
1706	{
1707	LogFunc(("pszComment is too long, %d bytes!\n", cchComment));
1708	rc = VERR_VD_VDI_COMMENT_TOO_LONG;
1709	goto out;
1710	}
1711
1712	/* we don't support old style images */
1713	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1714	{
1715	/*
1716	* Update the comment field, making sure to zero out all of the previous comment.
1717	*/
1718	memset(pImage->Header.u.v1.szComment, '\0', VDI_IMAGE_COMMENT_SIZE);
1719	memcpy(pImage->Header.u.v1.szComment, pszComment, cchComment);
1720
1721	/* write out new the header */
1722	rc = vdiUpdateHeader(pImage);
1723	}
1724	else
1725	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1726	}
1727	else
1728	rc = VERR_VD_NOT_OPENED;
1729
1730	out:
1731	LogFlowFunc(("returns %Rrc\n", rc));
1732	return rc;
1733	}
1734
1735	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
1736	static int vdiGetUuid(void *pBackendData, PRTUUID pUuid)
1737	{
1738	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1739	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1740	int rc;
1741
1742	AssertPtr(pImage);
1743
1744	if (pImage)
1745	{
1746	pUuid = getImageCreationUUID(&pImage->Header);
1747	rc = VINF_SUCCESS;
1748	}
1749	else
1750	rc = VERR_VD_NOT_OPENED;
1751
1752	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1753	return rc;
1754	}
1755
1756	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
1757	static int vdiSetUuid(void *pBackendData, PCRTUUID pUuid)
1758	{
1759	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1760	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1761	int rc = VINF_SUCCESS;
1762
1763	AssertPtr(pImage);
1764
1765	if (pImage)
1766	{
1767	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1768	{
1769	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1770	pImage->Header.u.v1.uuidCreate = *pUuid;
1771	/* Make it possible to clone old VDIs. */
1772	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1773	pImage->Header.u.v0.uuidCreate = *pUuid;
1774	else
1775	{
1776	LogFunc(("Version is not supported!\n"));
1777	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1778	}
1779	}
1780	else
1781	rc = VERR_VD_IMAGE_READ_ONLY;
1782	}
1783	else
1784	rc = VERR_VD_NOT_OPENED;
1785
1786	LogFlowFunc(("returns %Rrc\n", rc));
1787	return rc;
1788	}
1789
1790	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
1791	static int vdiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
1792	{
1793	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1794	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1795	int rc;
1796
1797	AssertPtr(pImage);
1798
1799	if (pImage)
1800	{
1801	pUuid = getImageModificationUUID(&pImage->Header);
1802	rc = VINF_SUCCESS;
1803	}
1804	else
1805	rc = VERR_VD_NOT_OPENED;
1806
1807	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1808	return rc;
1809	}
1810
1811	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
1812	static int vdiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
1813	{
1814	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1815	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1816	int rc = VINF_SUCCESS;
1817
1818	AssertPtr(pImage);
1819
1820	if (pImage)
1821	{
1822	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1823	{
1824	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1825	pImage->Header.u.v1.uuidModify = *pUuid;
1826	/* Make it possible to clone old VDIs. */
1827	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1828	pImage->Header.u.v0.uuidModify = *pUuid;
1829	else
1830	{
1831	LogFunc(("Version is not supported!\n"));
1832	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1833	}
1834	}
1835	else
1836	rc = VERR_VD_IMAGE_READ_ONLY;
1837	}
1838	else
1839	rc = VERR_VD_NOT_OPENED;
1840
1841	LogFlowFunc(("returns %Rrc\n", rc));
1842	return rc;
1843	}
1844
1845	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
1846	static int vdiGetParentUuid(void *pBackendData, PRTUUID pUuid)
1847	{
1848	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1849	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1850	int rc;
1851
1852	AssertPtr(pImage);
1853
1854	if (pImage)
1855	{
1856	pUuid = getImageParentUUID(&pImage->Header);
1857	rc = VINF_SUCCESS;
1858	}
1859	else
1860	rc = VERR_VD_NOT_OPENED;
1861
1862	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1863	return rc;
1864	}
1865
1866	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
1867	static int vdiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
1868	{
1869	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1870	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1871	int rc = VINF_SUCCESS;
1872
1873	AssertPtr(pImage);
1874
1875	if (pImage)
1876	{
1877	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1878	{
1879	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1880	pImage->Header.u.v1.uuidLinkage = *pUuid;
1881	/* Make it possible to clone old VDIs. */
1882	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1883	pImage->Header.u.v0.uuidLinkage = *pUuid;
1884	else
1885	{
1886	LogFunc(("Version is not supported!\n"));
1887	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1888	}
1889	}
1890	else
1891	rc = VERR_VD_IMAGE_READ_ONLY;
1892	}
1893	else
1894	rc = VERR_VD_NOT_OPENED;
1895
1896	LogFlowFunc(("returns %Rrc\n", rc));
1897	return rc;
1898	}
1899
1900	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
1901	static int vdiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
1902	{
1903	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1904	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1905	int rc;
1906
1907	AssertPtr(pImage);
1908
1909	if (pImage)
1910	{
1911	pUuid = getImageParentModificationUUID(&pImage->Header);
1912	rc = VINF_SUCCESS;
1913	}
1914	else
1915	rc = VERR_VD_NOT_OPENED;
1916
1917	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1918	return rc;
1919	}
1920
1921	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
1922	static int vdiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
1923	{
1924	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1925	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1926	int rc = VINF_SUCCESS;
1927
1928	AssertPtr(pImage);
1929
1930	if (pImage)
1931	{
1932	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1933	{
1934	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1935	pImage->Header.u.v1.uuidParentModify = *pUuid;
1936	else
1937	{
1938	LogFunc(("Version is not supported!\n"));
1939	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1940	}
1941	}
1942	else
1943	rc = VERR_VD_IMAGE_READ_ONLY;
1944	}
1945	else
1946	rc = VERR_VD_NOT_OPENED;
1947
1948	LogFlowFunc(("returns %Rrc\n", rc));
1949	return rc;
1950	}
1951
1952	/** @copydoc VBOXHDDBACKEND::pfnDump */
1953	static void vdiDump(void *pBackendData)
1954	{
1955	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1956
1957	vdiMessage(pImage, "Dumping VDI image \"%s\" mode=%s uOpenFlags=%X File=%#p\n",
1958	pImage->pszFilename,
1959	(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) ? "r/o" : "r/w",
1960	pImage->uOpenFlags,
1961	pImage->pStorage);
1962	vdiMessage(pImage, "Header: Version=%08X Type=%X Flags=%X Size=%llu\n",
1963	pImage->PreHeader.u32Version,
1964	getImageType(&pImage->Header),
1965	getImageFlags(&pImage->Header),
1966	getImageDiskSize(&pImage->Header));
1967	vdiMessage(pImage, "Header: cbBlock=%u cbBlockExtra=%u cBlocks=%u cBlocksAllocated=%u\n",
1968	getImageBlockSize(&pImage->Header),
1969	getImageExtraBlockSize(&pImage->Header),
1970	getImageBlocks(&pImage->Header),
1971	getImageBlocksAllocated(&pImage->Header));
1972	vdiMessage(pImage, "Header: offBlocks=%u offData=%u\n",
1973	getImageBlocksOffset(&pImage->Header),
1974	getImageDataOffset(&pImage->Header));
1975	PVDIDISKGEOMETRY pg = getImageLCHSGeometry(&pImage->Header);
1976	if (pg)
1977	vdiMessage(pImage, "Header: Geometry: C/H/S=%u/%u/%u cbSector=%u\n",
1978	pg->cCylinders, pg->cHeads, pg->cSectors, pg->cbSector);
1979	vdiMessage(pImage, "Header: uuidCreation={%RTuuid}\n", getImageCreationUUID(&pImage->Header));
1980	vdiMessage(pImage, "Header: uuidModification={%RTuuid}\n", getImageModificationUUID(&pImage->Header));
1981	vdiMessage(pImage, "Header: uuidParent={%RTuuid}\n", getImageParentUUID(&pImage->Header));
1982	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) >= 1)
1983	vdiMessage(pImage, "Header: uuidParentModification={%RTuuid}\n", getImageParentModificationUUID(&pImage->Header));
1984	vdiMessage(pImage, "Image: fFlags=%08X offStartBlocks=%u offStartData=%u\n",
1985	pImage->uImageFlags, pImage->offStartBlocks, pImage->offStartData);
1986	vdiMessage(pImage, "Image: uBlockMask=%08X cbTotalBlockData=%u uShiftOffset2Index=%u offStartBlockData=%u\n",
1987	pImage->uBlockMask,
1988	pImage->cbTotalBlockData,
1989	pImage->uShiftOffset2Index,
1990	pImage->offStartBlockData);
1991
1992	unsigned uBlock, cBlocksNotFree, cBadBlocks, cBlocks = getImageBlocks(&pImage->Header);
1993	for (uBlock=0, cBlocksNotFree=0, cBadBlocks=0; uBlock<cBlocks; uBlock++)
1994	{
1995	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
1996	{
1997	cBlocksNotFree++;
1998	if (pImage->paBlocks[uBlock] >= cBlocks)
1999	cBadBlocks++;
2000	}
2001	}
2002	if (cBlocksNotFree != getImageBlocksAllocated(&pImage->Header))
2003	{
2004	vdiMessage(pImage, "!! WARNING: %u blocks actually allocated (cBlocksAllocated=%u) !!\n",
2005	cBlocksNotFree, getImageBlocksAllocated(&pImage->Header));
2006	}
2007	if (cBadBlocks)
2008	{
2009	vdiMessage(pImage, "!! WARNING: %u bad blocks found !!\n",
2010	cBadBlocks);
2011	}
2012	}
2013
2014	static bool vdiIsAsyncIOSupported(void *pBackendData)
2015	{
2016	return true;
2017	}
2018
2019	static int vdiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
2020	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
2021	{
2022	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
2023	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
2024	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2025	unsigned uBlock;
2026	unsigned offRead;
2027	int rc;
2028
2029	AssertPtr(pImage);
2030	Assert(!(uOffset % 512));
2031	Assert(!(cbToRead % 512));
2032
2033	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
2034	\|\| !VALID_PTR(pIoCtx)
2035	\|\| !cbToRead)
2036	{
2037	rc = VERR_INVALID_PARAMETER;
2038	goto out;
2039	}
2040
2041	/* Calculate starting block number and offset inside it. */
2042	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2043	offRead = (unsigned)uOffset & pImage->uBlockMask;
2044
2045	/* Clip read range to at most the rest of the block. */
2046	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
2047	Assert(!(cbToRead % 512));
2048
2049	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
2050	rc = VERR_VD_BLOCK_FREE;
2051	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
2052	{
2053	size_t cbSet;
2054
2055	cbSet = vdiFileIoCtxSet(pImage, pIoCtx, 0, cbToRead);
2056	Assert(cbSet == cbToRead);
2057
2058	rc = VINF_SUCCESS;
2059	}
2060	else
2061	{
2062	/* Block present in image file, read relevant data. */
2063	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2064	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
2065	rc = vdiFileReadUserAsync(pImage, u64Offset, pIoCtx, cbToRead);
2066	}
2067
2068	if (pcbActuallyRead)
2069	*pcbActuallyRead = cbToRead;
2070
2071	out:
2072	LogFlowFunc(("returns %Rrc\n", rc));
2073	return rc;
2074	}
2075
2076	static int vdiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
2077	PVDIOCTX pIoCtx,
2078	size_t pcbWriteProcess, size_t pcbPreRead,
2079	size_t *pcbPostRead, unsigned fWrite)
2080	{
2081	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
2082	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2083	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2084	unsigned uBlock;
2085	unsigned offWrite;
2086	int rc = VINF_SUCCESS;
2087
2088	AssertPtr(pImage);
2089	Assert(!(uOffset % 512));
2090	Assert(!(cbToWrite % 512));
2091
2092	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2093	{
2094	rc = VERR_VD_IMAGE_READ_ONLY;
2095	goto out;
2096	}
2097
2098	if (!VALID_PTR(pIoCtx) \|\| !cbToWrite)
2099	{
2100	rc = VERR_INVALID_PARAMETER;
2101	goto out;
2102	}
2103
2104	/* No size check here, will do that later. For dynamic images which are
2105	* not multiples of the block size in length, this would prevent writing to
2106	* the last block. */
2107
2108	/* Calculate starting block number and offset inside it. */
2109	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2110	offWrite = (unsigned)uOffset & pImage->uBlockMask;
2111
2112	/* Clip write range to at most the rest of the block. */
2113	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
2114	Assert(!(cbToWrite % 512));
2115
2116	do
2117	{
2118	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2119	{
2120	/* Block is either free or zero. */
2121	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
2122	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
2123	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
2124	{
2125	#if 0 /** @todo Provide interface to check an I/O context for a specific value */
2126	/* If the destination block is unallocated at this point, it's
2127	* either a zero block or a block which hasn't been used so far
2128	* (which also means that it's a zero block. Don't need to write
2129	* anything to this block if the data consists of just zeroes. */
2130	Assert(!(cbToWrite % 4));
2131	Assert(cbToWrite * 8 <= UINT32_MAX);
2132	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
2133	{
2134	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
2135	break;
2136	}
2137	#endif
2138	}
2139
2140	if ( cbToWrite == getImageBlockSize(&pImage->Header)
2141	&& !(fWrite & VD_WRITE_NO_ALLOC))
2142	{
2143	/* Full block write to previously unallocated block.
2144	* Allocate block and write data. */
2145	Assert(!offWrite);
2146	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
2147	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
2148	+ (pImage->offStartData + pImage->offStartBlockData);
2149	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2150	if (RT_UNLIKELY(RT_FAILURE_NP(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS)))
2151	goto out;
2152	pImage->paBlocks[uBlock] = cBlocksAllocated;
2153	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
2154
2155	rc = vdiUpdateBlockInfoAsync(pImage, uBlock, pIoCtx);
2156	if (RT_FAILURE(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS))
2157	goto out;
2158
2159	*pcbPreRead = 0;
2160	*pcbPostRead = 0;
2161	}
2162	else
2163	{
2164	/* Trying to do a partial write to an unallocated block. Don't do
2165	* anything except letting the upper layer know what to do. */
2166	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
2167	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
2168	rc = VERR_VD_BLOCK_FREE;
2169	}
2170	}
2171	else
2172	{
2173	/* Block present in image file, write relevant data. */
2174	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2175	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
2176	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2177	}
2178	} while (0);
2179
2180	if (pcbWriteProcess)
2181	*pcbWriteProcess = cbToWrite;
2182
2183	out:
2184	LogFlowFunc(("returns %Rrc\n", rc));
2185	return rc;
2186	}
2187
2188	static int vdiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
2189	{
2190	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2191	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2192	int rc = VINF_SUCCESS;
2193
2194	Assert(pImage);
2195
2196	rc = vdiFlushImageAsync(pImage, pIoCtx);
2197	LogFlowFunc(("returns %Rrc\n", rc));
2198	return rc;
2199	}
2200
2201	/** @copydoc VBOXHDDBACKEND::pfnCompact */
2202	static int vdiCompact(void *pBackendData, unsigned uPercentStart,
2203	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2204	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2205	{
2206	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2207	int rc = VINF_SUCCESS;
2208	void pvBuf = NULL, pvTmp = NULL;
2209	unsigned *paBlocks2 = NULL;
2210
2211	int (pfnParentRead)(void , uint64_t, void *, size_t) = NULL;
2212	void *pvParent = NULL;
2213	PVDINTERFACE pIfParentState = VDInterfaceGet(pVDIfsOperation,
2214	VDINTERFACETYPE_PARENTSTATE);
2215	PVDINTERFACEPARENTSTATE pCbParentState = NULL;
2216	if (pIfParentState)
2217	{
2218	pCbParentState = VDGetInterfaceParentState(pIfParentState);
2219	if (pCbParentState)
2220	pfnParentRead = pCbParentState->pfnParentRead;
2221	pvParent = pIfParentState->pvUser;
2222	}
2223
2224	PFNVDPROGRESS pfnProgress = NULL;
2225	void *pvUser = NULL;
2226	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2227	VDINTERFACETYPE_PROGRESS);
2228	PVDINTERFACEPROGRESS pCbProgress = NULL;
2229	if (pIfProgress)
2230	{
2231	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2232	if (pCbProgress)
2233	pfnProgress = pCbProgress->pfnProgress;
2234	pvUser = pIfProgress->pvUser;
2235	}
2236
2237	do {
2238	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2239
2240	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2241	rc = VERR_VD_IMAGE_READ_ONLY);
2242
2243	unsigned cBlocks;
2244	unsigned cBlocksToMove = 0;
2245	size_t cbBlock;
2246	cBlocks = getImageBlocks(&pImage->Header);
2247	cbBlock = getImageBlockSize(&pImage->Header);
2248	if (pfnParentRead)
2249	{
2250	pvBuf = RTMemTmpAlloc(cbBlock);
2251	AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);
2252	}
2253	pvTmp = RTMemTmpAlloc(cbBlock);
2254	AssertBreakStmt(VALID_PTR(pvTmp), rc = VERR_NO_MEMORY);
2255
2256	uint64_t cbFile;
2257	rc = vdiFileGetSize(pImage, &cbFile);
2258	AssertRCBreak(rc);
2259	unsigned cBlocksAllocated = (unsigned)((cbFile - pImage->offStartData - pImage->offStartBlockData) >> pImage->uShiftOffset2Index);
2260	if (cBlocksAllocated == 0)
2261	{
2262	/* No data blocks in this image, no need to compact. */
2263	rc = VINF_SUCCESS;
2264	break;
2265	}
2266
2267	/* Allocate block array for back resolving. */
2268	paBlocks2 = (unsigned )RTMemAlloc(sizeof(unsigned ) * cBlocksAllocated);
2269	AssertBreakStmt(VALID_PTR(paBlocks2), rc = VERR_NO_MEMORY);
2270	/* Fill out back resolving, check/fix allocation errors before
2271	* compacting the image, just to be on the safe side. Update the
2272	* image contents straight away, as this enables cancelling. */
2273	for (unsigned i = 0; i < cBlocksAllocated; i++)
2274	paBlocks2[i] = VDI_IMAGE_BLOCK_FREE;
2275	rc = VINF_SUCCESS;
2276	for (unsigned i = 0; i < cBlocks; i++)
2277	{
2278	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2279	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2280	{
2281	if (ptrBlock < cBlocksAllocated)
2282	{
2283	if (paBlocks2[ptrBlock] == VDI_IMAGE_BLOCK_FREE)
2284	paBlocks2[ptrBlock] = i;
2285	else
2286	{
2287	LogFunc(("Freed cross-linked block %u in file \"%s\"\n",
2288	i, pImage->pszFilename));
2289	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2290	rc = vdiUpdateBlockInfo(pImage, i);
2291	if (RT_FAILURE(rc))
2292	break;
2293	}
2294	}
2295	else
2296	{
2297	LogFunc(("Freed out of bounds reference for block %u in file \"%s\"\n",
2298	i, pImage->pszFilename));
2299	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2300	rc = vdiUpdateBlockInfo(pImage, i);
2301	if (RT_FAILURE(rc))
2302	break;
2303	}
2304	}
2305	}
2306	if (RT_FAILURE(rc))
2307	break;
2308
2309	/* Find redundant information and update the block pointers
2310	* accordingly, creating bubbles. Keep disk up to date, as this
2311	* enables cancelling. */
2312	for (unsigned i = 0; i < cBlocks; i++)
2313	{
2314	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2315	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2316	{
2317	/* Block present in image file, read relevant data. */
2318	uint64_t u64Offset = (uint64_t)ptrBlock * pImage->cbTotalBlockData
2319	+ (pImage->offStartData + pImage->offStartBlockData);
2320	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2321	if (RT_FAILURE(rc))
2322	break;
2323
2324	if (ASMBitFirstSet((volatile void )pvTmp, (uint32_t)cbBlock 8) == -1)
2325	{
2326	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_ZERO;
2327	rc = vdiUpdateBlockInfo(pImage, i);
2328	if (RT_FAILURE(rc))
2329	break;
2330	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2331	/* Adjust progress info, one block to be relocated. */
2332	cBlocksToMove++;
2333	}
2334	else if (pfnParentRead)
2335	{
2336	rc = pfnParentRead(pvParent, i * cbBlock, pvBuf, cbBlock);
2337	if (RT_FAILURE(rc))
2338	break;
2339	if (!memcmp(pvTmp, pvBuf, cbBlock))
2340	{
2341	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2342	rc = vdiUpdateBlockInfo(pImage, i);
2343	if (RT_FAILURE(rc))
2344	break;
2345	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2346	/* Adjust progress info, one block to be relocated. */
2347	cBlocksToMove++;
2348	}
2349	}
2350	}
2351
2352	if (pCbProgress && pCbProgress->pfnProgress)
2353	{
2354	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2355	(uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2356	if (RT_FAILURE(rc))
2357	break;
2358	}
2359	}
2360	if (RT_FAILURE(rc))
2361	break;
2362
2363	/* Fill bubbles with other data (if available). */
2364	unsigned cBlocksMoved = 0;
2365	unsigned uBlockUsedPos = cBlocksAllocated;
2366	for (unsigned i = 0; i < cBlocksAllocated; i++)
2367	{
2368	unsigned uBlock = paBlocks2[i];
2369	if (uBlock == VDI_IMAGE_BLOCK_FREE)
2370	{
2371	unsigned uBlockData = VDI_IMAGE_BLOCK_FREE;
2372	while (uBlockUsedPos > i && uBlockData == VDI_IMAGE_BLOCK_FREE)
2373	{
2374	uBlockUsedPos--;
2375	uBlockData = paBlocks2[uBlockUsedPos];
2376	}
2377	/* Terminate early if there is no block which needs copying. */
2378	if (uBlockUsedPos == i)
2379	break;
2380	uint64_t u64Offset = (uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2381	+ (pImage->offStartData + pImage->offStartBlockData);
2382	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2383	u64Offset = (uint64_t)i * pImage->cbTotalBlockData
2384	+ (pImage->offStartData + pImage->offStartBlockData);
2385	rc = vdiFileWriteSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2386	pImage->paBlocks[uBlockData] = i;
2387	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated - cBlocksMoved);
2388	rc = vdiUpdateBlockInfo(pImage, uBlockData);
2389	if (RT_FAILURE(rc))
2390	break;
2391	paBlocks2[i] = uBlockData;
2392	paBlocks2[uBlockUsedPos] = VDI_IMAGE_BLOCK_FREE;
2393	cBlocksMoved++;
2394	}
2395
2396	if (pCbProgress && pCbProgress->pfnProgress)
2397	{
2398	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2399	(uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2400
2401	if (RT_FAILURE(rc))
2402	break;
2403	}
2404	}
2405	if (RT_FAILURE(rc))
2406	break;
2407
2408	/* Update image header. */
2409	setImageBlocksAllocated(&pImage->Header, uBlockUsedPos);
2410	vdiUpdateHeader(pImage);
2411
2412	/* Truncate the image to the proper size to finish compacting. */
2413	rc = vdiFileSetSize(pImage,
2414	(uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2415	+ pImage->offStartData + pImage->offStartBlockData);
2416	} while (0);
2417
2418	if (paBlocks2)
2419	RTMemTmpFree(paBlocks2);
2420	if (pvTmp)
2421	RTMemTmpFree(pvTmp);
2422	if (pvBuf)
2423	RTMemTmpFree(pvBuf);
2424
2425	if (RT_SUCCESS(rc) && pCbProgress && pCbProgress->pfnProgress)
2426	{
2427	pCbProgress->pfnProgress(pIfProgress->pvUser,
2428	uPercentStart + uPercentSpan);
2429	}
2430
2431	LogFlowFunc(("returns %Rrc\n", rc));
2432	return rc;
2433	}
2434
2435
2436	/** @copydoc VBOXHDDBACKEND::pfnResize */
2437	static int vdiResize(void *pBackendData, uint64_t cbSize,
2438	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2439	unsigned uPercentStart, unsigned uPercentSpan,
2440	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2441	PVDINTERFACE pVDIfsOperation)
2442	{
2443	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2444	int rc = VINF_SUCCESS;
2445
2446	PFNVDPROGRESS pfnProgress = NULL;
2447	void *pvUser = NULL;
2448	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2449	VDINTERFACETYPE_PROGRESS);
2450	PVDINTERFACEPROGRESS pCbProgress = NULL;
2451	if (pIfProgress)
2452	{
2453	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2454	if (pCbProgress)
2455	pfnProgress = pCbProgress->pfnProgress;
2456	pvUser = pIfProgress->pvUser;
2457	}
2458
2459	/*
2460	* Making the image smaller is not supported at the moment.
2461	* Resizing is also not supported for fixed size images and
2462	* very old images.
2463	*/
2464	/** @todo implement making the image smaller, it is the responsibility of
2465	* the user to know what he's doing. */
2466	if ( cbSize < getImageDiskSize(&pImage->Header)
2467	\|\| GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0
2468	\|\| pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2469	rc = VERR_NOT_SUPPORTED;
2470	else if (cbSize > getImageDiskSize(&pImage->Header))
2471	{
2472	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header); /** < Blocks currently allocated, doesn't change during resize */
2473	uint32_t cBlocksNew = cbSize / getImageBlockSize(&pImage->Header); /** < New number of blocks in the image after the resize */
2474	if (cbSize % getImageBlockSize(&pImage->Header))
2475	cBlocksNew++;
2476
2477	uint32_t cBlocksOld = getImageBlocks(&pImage->Header); /** < Number of blocks before the resize. */
2478	uint64_t cbBlockspaceNew = cBlocksNew * sizeof(VDIIMAGEBLOCKPOINTER); /** < Required space for the block array after the resize. */
2479	uint64_t offStartDataNew = RT_ALIGN_32(pImage->offStartBlocks + cbBlockspaceNew, VDI_DATA_ALIGN); /** < New start offset for block data after the resize */
2480
2481	if ( pImage->offStartData != offStartDataNew
2482	&& cBlocksAllocated > 0)
2483	{
2484	/* Calculate how many sectors need to be relocated. */
2485	uint64_t cbOverlapping = offStartDataNew - pImage->offStartData;
2486	unsigned cBlocksReloc = cbOverlapping / getImageBlockSize(&pImage->Header);
2487	if (cbOverlapping % getImageBlockSize(&pImage->Header))
2488	cBlocksReloc++;
2489
2490	/* Since only full blocks can be relocated the new data start is
2491	* determined by moving it block by block. */
2492	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2493	offStartDataNew = pImage->offStartData;
2494
2495	/* Do the relocation. */
2496	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2497
2498	/*
2499	* Get the blocks we need to relocate first, they are appended to the end
2500	* of the image.
2501	*/
2502	void pvBuf = NULL, pvZero = NULL;
2503	do
2504	{
2505	VDIIMAGEBLOCKPOINTER uBlock = 0;
2506
2507	/* Allocate data buffer. */
2508	pvBuf = RTMemAllocZ(pImage->cbTotalBlockData);
2509	if (!pvBuf)
2510	{
2511	rc = VERR_NO_MEMORY;
2512	break;
2513	}
2514
2515	/* Allocate buffer for overwrting with zeroes. */
2516	pvZero = RTMemAllocZ(pImage->cbTotalBlockData);
2517	if (!pvZero)
2518	{
2519	rc = VERR_NO_MEMORY;
2520	break;
2521	}
2522
2523	for (unsigned i = 0; i < cBlocksReloc; i++)
2524	{
2525	/* Search the index in the block table. */
2526	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2527	{
2528	if (pImage->paBlocks[idxBlock] == uBlock)
2529	{
2530	/* Read data and append to the end of the image. */
2531	rc = vdiFileReadSync(pImage, offStartDataNew, pvBuf, pImage->cbTotalBlockData, NULL);
2532	if (RT_FAILURE(rc))
2533	break;
2534
2535	uint64_t offBlockAppend;
2536	rc = vdiFileGetSize(pImage, &offBlockAppend);
2537	if (RT_FAILURE(rc))
2538	break;
2539
2540	rc = vdiFileWriteSync(pImage, offBlockAppend, pvBuf, pImage->cbTotalBlockData, NULL);
2541	if (RT_FAILURE(rc))
2542	break;
2543
2544	/* Zero out the old block area. */
2545	rc = vdiFileWriteSync(pImage, offStartDataNew, pvZero, pImage->cbTotalBlockData, NULL);
2546	if (RT_FAILURE(rc))
2547	break;
2548
2549	/* Update block counter. */
2550	pImage->paBlocks[idxBlock] = cBlocksAllocated - 1;
2551
2552	/*
2553	* Decrease the block number of all other entries in the array.
2554	* They were moved one block to the front.
2555	* Doing it as a separate step iterating over the array again
2556	* because an error while relocating the block might end up
2557	* in a corrupted image otherwise.
2558	*/
2559	for (unsigned idxBlock2 = 0; idxBlock2 < cBlocksOld; idxBlock2++)
2560	{
2561	if ( idxBlock2 != idxBlock
2562	&& IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[idxBlock2]))
2563	pImage->paBlocks[idxBlock2]--;
2564	}
2565
2566	/* Continue with the next block. */
2567	break;
2568	}
2569	}
2570
2571	if (RT_FAILURE(rc))
2572	break;
2573
2574	uBlock++;
2575	offStartDataNew += pImage->cbTotalBlockData;
2576	}
2577	} while (0);
2578
2579	if (pvBuf)
2580	RTMemFree(pvBuf);
2581	if (pvZero)
2582	RTMemFree(pvZero);
2583	}
2584
2585	/*
2586	* We need to update the new offsets for the image data in the out of memory
2587	* case too because we relocated the blocks already.
2588	*/
2589	pImage->offStartData = offStartDataNew;
2590	setImageDataOffset(&pImage->Header, offStartDataNew);
2591
2592	/*
2593	* Relocation done, expand the block array and update the header with
2594	* the new data.
2595	*/
2596	if (RT_SUCCESS(rc))
2597	{
2598	PVDIIMAGEBLOCKPOINTER paBlocksNew = (PVDIIMAGEBLOCKPOINTER)RTMemRealloc(pImage->paBlocks, cbBlockspaceNew);
2599	if (paBlocksNew)
2600	{
2601	pImage->paBlocks = paBlocksNew;
2602
2603	/* Mark the new blocks as unallocated. */
2604	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
2605	pImage->paBlocks[idxBlock] = VDI_IMAGE_BLOCK_FREE;
2606	}
2607	else
2608	rc = VERR_NO_MEMORY;
2609
2610	/* Write the block array before updating the rest. */
2611	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
2612	cbBlockspaceNew, NULL);
2613
2614	if (RT_SUCCESS(rc))
2615	{
2616	/* Update size and new block count. */
2617	setImageDiskSize(&pImage->Header, cbSize);
2618	setImageBlocks(&pImage->Header, cBlocksNew);
2619	/* Update geometry. */
2620	pImage->PCHSGeometry = *pPCHSGeometry;
2621
2622	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
2623	if (pGeometry)
2624	{
2625	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
2626	pGeometry->cHeads = pLCHSGeometry->cHeads;
2627	pGeometry->cSectors = pLCHSGeometry->cSectors;
2628	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
2629	}
2630	}
2631	}
2632
2633	/* Update header information in base image file. */
2634	vdiFlushImage(pImage);
2635	}
2636	/* Same size doesn't change the image at all. */
2637
2638	LogFlowFunc(("returns %Rrc\n", rc));
2639	return rc;
2640	}
2641
2642
2643	VBOXHDDBACKEND g_VDIBackend =
2644	{
2645	/* pszBackendName */
2646	"VDI",
2647	/* cbSize */
2648	sizeof(VBOXHDDBACKEND),
2649	/* uBackendCaps */
2650	VD_CAP_UUID \| VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC
2651	\| VD_CAP_DIFF \| VD_CAP_FILE \| VD_CAP_ASYNC \| VD_CAP_VFS,
2652	/* papszFileExtensions */
2653	s_apszVdiFileExtensions,
2654	/* paConfigInfo */
2655	NULL,
2656	/* hPlugin */
2657	NIL_RTLDRMOD,
2658	/* pfnCheckIfValid */
2659	vdiCheckIfValid,
2660	/* pfnOpen */
2661	vdiOpen,
2662	/* pfnCreate */
2663	vdiCreate,
2664	/* pfnRename */
2665	vdiRename,
2666	/* pfnClose */
2667	vdiClose,
2668	/* pfnRead */
2669	vdiRead,
2670	/* pfnWrite */
2671	vdiWrite,
2672	/* pfnFlush */
2673	vdiFlush,
2674	/* pfnGetVersion */
2675	vdiGetVersion,
2676	/* pfnGetSize */
2677	vdiGetSize,
2678	/* pfnGetFileSize */
2679	vdiGetFileSize,
2680	/* pfnGetPCHSGeometry */
2681	vdiGetPCHSGeometry,
2682	/* pfnSetPCHSGeometry */
2683	vdiSetPCHSGeometry,
2684	/* pfnGetLCHSGeometry */
2685	vdiGetLCHSGeometry,
2686	/* pfnSetLCHSGeometry */
2687	vdiSetLCHSGeometry,
2688	/* pfnGetImageFlags */
2689	vdiGetImageFlags,
2690	/* pfnGetOpenFlags */
2691	vdiGetOpenFlags,
2692	/* pfnSetOpenFlags */
2693	vdiSetOpenFlags,
2694	/* pfnGetComment */
2695	vdiGetComment,
2696	/* pfnSetComment */
2697	vdiSetComment,
2698	/* pfnGetUuid */
2699	vdiGetUuid,
2700	/* pfnSetUuid */
2701	vdiSetUuid,
2702	/* pfnGetModificationUuid */
2703	vdiGetModificationUuid,
2704	/* pfnSetModificationUuid */
2705	vdiSetModificationUuid,
2706	/* pfnGetParentUuid */
2707	vdiGetParentUuid,
2708	/* pfnSetParentUuid */
2709	vdiSetParentUuid,
2710	/* pfnGetParentModificationUuid */
2711	vdiGetParentModificationUuid,
2712	/* pfnSetParentModificationUuid */
2713	vdiSetParentModificationUuid,
2714	/* pfnDump */
2715	vdiDump,
2716	/* pfnGetTimeStamp */
2717	NULL,
2718	/* pfnGetParentTimeStamp */
2719	NULL,
2720	/* pfnSetParentTimeStamp */
2721	NULL,
2722	/* pfnGetParentFilename */
2723	NULL,
2724	/* pfnSetParentFilename */
2725	NULL,
2726	/* pfnIsAsyncIOSupported */
2727	vdiIsAsyncIOSupported,
2728	/* pfnAsyncRead */
2729	vdiAsyncRead,
2730	/* pfnAsyncWrite */
2731	vdiAsyncWrite,
2732	/* pfnAsyncFlush */
2733	vdiAsyncFlush,
2734	/* pfnComposeLocation */
2735	genericFileComposeLocation,
2736	/* pfnComposeName */
2737	genericFileComposeName,
2738	/* pfnCompact */
2739	vdiCompact,
2740	/* pfnResize */
2741	vdiResize
2742	};

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source: vbox/trunk/src/VBox/Devices/Storage/VDIHDDCore.cpp@ 33081

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