VDIHDDCore.cpp@ 33481

Last change on this file since 33481 was 33478, checked in by vboxsync, 14 years ago
Devices/Storage: a number of small memory leaks in error paths
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File size: 95.3 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	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	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading pre-header in '%s'"), pImage->pszFilename);
775	goto out;
776	}
777	rc = vdiValidatePreHeader(&pImage->PreHeader);
778	if (RT_FAILURE(rc))
779	{
780	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: invalid pre-header in '%s'"), pImage->pszFilename);
781	goto out;
782	}
783
784	/* Read header. */
785	pImage->Header.uVersion = pImage->PreHeader.u32Version;
786	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
787	{
788	case 0:
789	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
790	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
791	NULL);
792	if (RT_FAILURE(rc))
793	{
794	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v0 header in '%s'"), pImage->pszFilename);
795	goto out;
796	}
797	break;
798	case 1:
799	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
800	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
801	NULL);
802	if (RT_FAILURE(rc))
803	{
804	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1 header in '%s'"), pImage->pszFilename);
805	goto out;
806	}
807	/* Convert VDI 1.1 images to VDI 1.1+ on open in read/write mode.
808	* Conversion is harmless, as any VirtualBox version supporting VDI
809	* 1.1 doesn't touch fields it doesn't know about. */
810	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
811	&& GET_MINOR_HEADER_VERSION(&pImage->Header) == 1
812	&& pImage->Header.u.v1.cbHeader < sizeof(pImage->Header.u.v1plus))
813	{
814	pImage->Header.u.v1plus.cbHeader = sizeof(pImage->Header.u.v1plus);
815	/* Mark LCHS geometry not-calculated. */
816	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = 0;
817	pImage->Header.u.v1plus.LCHSGeometry.cHeads = 0;
818	pImage->Header.u.v1plus.LCHSGeometry.cSectors = 0;
819	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
820	}
821	else if (pImage->Header.u.v1.cbHeader >= sizeof(pImage->Header.u.v1plus))
822	{
823	/* Read the actual VDI 1.1+ header completely. */
824	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
825	&pImage->Header.u.v1plus,
826	sizeof(pImage->Header.u.v1plus), NULL);
827	if (RT_FAILURE(rc))
828	{
829	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1.1+ header in '%s'"), pImage->pszFilename);
830	goto out;
831	}
832	}
833	break;
834	default:
835	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);
836	goto out;
837	}
838
839	rc = vdiValidateHeader(&pImage->Header);
840	if (RT_FAILURE(rc))
841	{
842	rc = vdiError(pImage, VERR_VD_VDI_INVALID_HEADER, RT_SRC_POS, N_("VDI: invalid header in '%s'"), pImage->pszFilename);
843	goto out;
844	}
845
846	/* Setup image parameters by header. */
847	vdiSetupImageDesc(pImage);
848
849	/* Allocate memory for blocks array. */
850	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
851	if (!pImage->paBlocks)
852	{
853	rc = VERR_NO_MEMORY;
854	goto out;
855	}
856
857	/* Read blocks array. */
858	rc = vdiFileReadSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
859	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
860	NULL);
861
862	out:
863	if (RT_FAILURE(rc))
864	vdiFreeImage(pImage, false);
865	return rc;
866	}
867
868	/**
869	* Internal: Save header to file.
870	*/
871	static int vdiUpdateHeader(PVDIIMAGEDESC pImage)
872	{
873	int rc;
874	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
875	{
876	case 0:
877	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
878	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
879	NULL);
880	break;
881	case 1:
882	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
883	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
884	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
885	NULL);
886	else
887	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
888	&pImage->Header.u.v1plus, sizeof(pImage->Header.u.v1plus),
889	NULL);
890	break;
891	default:
892	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
893	break;
894	}
895	AssertMsgRC(rc, ("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
896	return rc;
897	}
898
899	/**
900	* Internal: Save header to file - async version.
901	*/
902	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
903	{
904	int rc;
905	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
906	{
907	case 0:
908	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
909	&pImage->Header.u.v0,
910	sizeof(pImage->Header.u.v0),
911	pIoCtx, NULL, NULL);
912	break;
913	case 1:
914	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
915	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
916	&pImage->Header.u.v1,
917	sizeof(pImage->Header.u.v1),
918	pIoCtx, NULL, NULL);
919	else
920	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
921	&pImage->Header.u.v1plus,
922	sizeof(pImage->Header.u.v1plus),
923	pIoCtx, NULL, NULL);
924	break;
925	default:
926	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
927	break;
928	}
929	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
930	("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
931	return rc;
932	}
933
934	/**
935	* Internal: Save block pointer to file, save header to file.
936	*/
937	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock)
938	{
939	/* Update image header. */
940	int rc = vdiUpdateHeader(pImage);
941	if (RT_SUCCESS(rc))
942	{
943	/* write only one block pointer. */
944	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
945	&pImage->paBlocks[uBlock], sizeof(VDIIMAGEBLOCKPOINTER),
946	NULL);
947	AssertMsgRC(rc, ("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
948	uBlock, pImage->pszFilename, rc));
949	}
950	return rc;
951	}
952
953	/**
954	* Internal: Save block pointer to file, save header to file - async version.
955	*/
956	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock,
957	PVDIOCTX pIoCtx)
958	{
959	/* Update image header. */
960	int rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
961	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
962	{
963	/* write only one block pointer. */
964	rc = vdiFileWriteMetaAsync(pImage,
965	pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
966	&pImage->paBlocks[uBlock],
967	sizeof(VDIIMAGEBLOCKPOINTER),
968	pIoCtx, NULL, NULL);
969	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
970	("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
971	uBlock, pImage->pszFilename, rc));
972	}
973	return rc;
974	}
975
976	/**
977	* Internal: Flush the image file to disk - async version.
978	*/
979	static int vdiFlushImageAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
980	{
981	int rc = VINF_SUCCESS;
982
983	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
984	{
985	/* Save header. */
986	rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
987	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
988	("vdiUpdateHeaderAsync() failed, filename=\"%s\", rc=%Rrc\n",
989	pImage->pszFilename, rc));
990	rc = vdiFileFlushAsync(pImage, pIoCtx, NULL, NULL);
991	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
992	("Flushing data to disk failed rc=%Rrc\n", rc));
993	}
994
995	return rc;
996	}
997
998
999	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
1000	static int vdiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1001	PVDINTERFACE pVDIfsImage)
1002	{
1003	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
1004	int rc = VINF_SUCCESS;
1005	PVDIIMAGEDESC pImage;
1006
1007	if ( !VALID_PTR(pszFilename)
1008	\|\| !*pszFilename)
1009	{
1010	rc = VERR_INVALID_PARAMETER;
1011	goto out;
1012	}
1013
1014	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1015	if (!pImage)
1016	{
1017	rc = VERR_NO_MEMORY;
1018	goto out;
1019	}
1020	pImage->pszFilename = pszFilename;
1021	pImage->pStorage = NULL;
1022	pImage->paBlocks = NULL;
1023	pImage->pVDIfsDisk = pVDIfsDisk;
1024	pImage->pVDIfsImage = pVDIfsImage;
1025
1026	rc = vdiOpenImage(pImage, VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_READONLY);
1027	vdiFreeImage(pImage, false);
1028	RTMemFree(pImage);
1029
1030	out:
1031	LogFlowFunc(("returns %Rrc\n", rc));
1032	return rc;
1033	}
1034
1035	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1036	static int vdiOpen(const char *pszFilename, unsigned uOpenFlags,
1037	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1038	void **ppBackendData)
1039	{
1040	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
1041	int rc;
1042	PVDIIMAGEDESC pImage;
1043
1044	/* Check open flags. All valid flags are supported. */
1045	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1046	{
1047	rc = VERR_INVALID_PARAMETER;
1048	goto out;
1049	}
1050
1051	/* Check remaining arguments. */
1052	if ( !VALID_PTR(pszFilename)
1053	\|\| !*pszFilename)
1054	{
1055	rc = VERR_INVALID_PARAMETER;
1056	goto out;
1057	}
1058
1059	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1060	if (!pImage)
1061	{
1062	rc = VERR_NO_MEMORY;
1063	goto out;
1064	}
1065	pImage->pszFilename = pszFilename;
1066	pImage->pStorage = NULL;
1067	pImage->paBlocks = NULL;
1068	pImage->pVDIfsDisk = pVDIfsDisk;
1069	pImage->pVDIfsImage = pVDIfsImage;
1070
1071	rc = vdiOpenImage(pImage, uOpenFlags);
1072	if (RT_SUCCESS(rc))
1073	*ppBackendData = pImage;
1074
1075	out:
1076	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1077	return rc;
1078	}
1079
1080	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1081	static int vdiCreate(const char *pszFilename, uint64_t cbSize,
1082	unsigned uImageFlags, const char *pszComment,
1083	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1084	PCRTUUID pUuid, unsigned uOpenFlags,
1085	unsigned uPercentStart, unsigned uPercentSpan,
1086	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1087	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
1088	{
1089	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));
1090	int rc;
1091	PVDIIMAGEDESC pImage;
1092
1093	PFNVDPROGRESS pfnProgress = NULL;
1094	void *pvUser = NULL;
1095	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
1096	VDINTERFACETYPE_PROGRESS);
1097	PVDINTERFACEPROGRESS pCbProgress = NULL;
1098	if (pIfProgress)
1099	{
1100	pCbProgress = VDGetInterfaceProgress(pIfProgress);
1101	if (pCbProgress)
1102	pfnProgress = pCbProgress->pfnProgress;
1103	pvUser = pIfProgress->pvUser;
1104	}
1105
1106	/* Check open flags. All valid flags are supported. */
1107	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1108	{
1109	rc = VERR_INVALID_PARAMETER;
1110	goto out;
1111	}
1112
1113	/* Check size. Maximum 4PB-3M. No tricks with adjusting the 1M block size
1114	* so far, which would extend the size. */
1115	cbSize = RT_ALIGN_64(cbSize, _1M);
1116	if ( !cbSize
1117	\|\| cbSize >= _1P * 2 - _1M * 3)
1118	{
1119	rc = VERR_VD_INVALID_SIZE;
1120	goto out;
1121	}
1122
1123	/* Check remaining arguments. */
1124	if ( !VALID_PTR(pszFilename)
1125	\|\| !*pszFilename
1126	\|\| cbSize < VDI_IMAGE_DEFAULT_BLOCK_SIZE
1127	\|\| !VALID_PTR(pPCHSGeometry)
1128	\|\| !VALID_PTR(pLCHSGeometry))
1129	{
1130	rc = VERR_INVALID_PARAMETER;
1131	goto out;
1132	}
1133
1134	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1135	if (!pImage)
1136	{
1137	rc = VERR_NO_MEMORY;
1138	goto out;
1139	}
1140	pImage->pszFilename = pszFilename;
1141	pImage->pStorage = NULL;
1142	pImage->paBlocks = NULL;
1143	pImage->pVDIfsDisk = pVDIfsDisk;
1144	pImage->pVDIfsImage = pVDIfsImage;
1145
1146	rc = vdiCreateImage(pImage, cbSize, uImageFlags, pszComment,
1147	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1148	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1149	if (RT_SUCCESS(rc))
1150	{
1151	/* So far the image is opened in read/write mode. Make sure the
1152	* image is opened in read-only mode if the caller requested that. */
1153	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1154	{
1155	vdiFreeImage(pImage, false);
1156	rc = vdiOpenImage(pImage, uOpenFlags);
1157	if (RT_FAILURE(rc))
1158	{
1159	RTMemFree(pImage);
1160	goto out;
1161	}
1162	}
1163	*ppBackendData = pImage;
1164	}
1165	else
1166	RTMemFree(pImage);
1167
1168	out:
1169	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1170	return rc;
1171	}
1172
1173	/** @copydoc VBOXHDDBACKEND::pfnRename */
1174	static int vdiRename(void pBackendData, const char pszFilename)
1175	{
1176	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1177
1178	int rc = VINF_SUCCESS;
1179	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1180
1181	/* Check arguments. */
1182	if ( !pImage
1183	\|\| !pszFilename
1184	\|\| !*pszFilename)
1185	{
1186	rc = VERR_INVALID_PARAMETER;
1187	goto out;
1188	}
1189
1190	/* Close the image. */
1191	vdiFreeImage(pImage, false);
1192
1193	/* Rename the file. */
1194	rc = vdiFileMove(pImage, pImage->pszFilename, pszFilename, 0);
1195	if (RT_FAILURE(rc))
1196	{
1197	/* The move failed, try to reopen the original image. */
1198	int rc2 = vdiOpenImage(pImage, pImage->uOpenFlags);
1199	if (RT_FAILURE(rc2))
1200	rc = rc2;
1201
1202	goto out;
1203	}
1204
1205	/* Update pImage with the new information. */
1206	pImage->pszFilename = pszFilename;
1207
1208	/* Open the new image. */
1209	rc = vdiOpenImage(pImage, pImage->uOpenFlags);
1210	if (RT_FAILURE(rc))
1211	goto out;
1212
1213	out:
1214	LogFlowFunc(("returns %Rrc\n", rc));
1215	return rc;
1216	}
1217
1218	/** @copydoc VBOXHDDBACKEND::pfnClose */
1219	static int vdiClose(void *pBackendData, bool fDelete)
1220	{
1221	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1222	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1223	int rc;
1224
1225	rc = vdiFreeImage(pImage, fDelete);
1226	RTMemFree(pImage);
1227
1228	LogFlowFunc(("returns %Rrc\n", rc));
1229	return rc;
1230	}
1231
1232	/** @copydoc VBOXHDDBACKEND::pfnRead */
1233	static int vdiRead(void pBackendData, uint64_t uOffset, void pvBuf,
1234	size_t cbToRead, size_t *pcbActuallyRead)
1235	{
1236	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
1237	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1238	unsigned uBlock;
1239	unsigned offRead;
1240	int rc;
1241
1242	AssertPtr(pImage);
1243	Assert(!(uOffset % 512));
1244	Assert(!(cbToRead % 512));
1245
1246	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
1247	\|\| !VALID_PTR(pvBuf)
1248	\|\| !cbToRead)
1249	{
1250	rc = VERR_INVALID_PARAMETER;
1251	goto out;
1252	}
1253
1254	/* Calculate starting block number and offset inside it. */
1255	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1256	offRead = (unsigned)uOffset & pImage->uBlockMask;
1257
1258	/* Clip read range to at most the rest of the block. */
1259	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
1260	Assert(!(cbToRead % 512));
1261
1262	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
1263	rc = VERR_VD_BLOCK_FREE;
1264	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
1265	{
1266	memset(pvBuf, 0, cbToRead);
1267	rc = VINF_SUCCESS;
1268	}
1269	else
1270	{
1271	/* Block present in image file, read relevant data. */
1272	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1273	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
1274	rc = vdiFileReadSync(pImage, u64Offset, pvBuf, cbToRead, NULL);
1275	}
1276
1277	if (pcbActuallyRead)
1278	*pcbActuallyRead = cbToRead;
1279
1280	out:
1281	LogFlowFunc(("returns %Rrc\n", rc));
1282	return rc;
1283	}
1284
1285	/*@copydoc VBOXHDDBACKEND::pfnWrite /
1286	static int vdiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
1287	size_t cbToWrite, size_t *pcbWriteProcess,
1288	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
1289	{
1290	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1291	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1292	unsigned uBlock;
1293	unsigned offWrite;
1294	int rc = VINF_SUCCESS;
1295
1296	AssertPtr(pImage);
1297	Assert(!(uOffset % 512));
1298	Assert(!(cbToWrite % 512));
1299
1300	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1301	{
1302	rc = VERR_VD_IMAGE_READ_ONLY;
1303	goto out;
1304	}
1305
1306	if (!VALID_PTR(pvBuf) \|\| !cbToWrite)
1307	{
1308	rc = VERR_INVALID_PARAMETER;
1309	goto out;
1310	}
1311
1312	/* No size check here, will do that later. For dynamic images which are
1313	* not multiples of the block size in length, this would prevent writing to
1314	* the last block. */
1315
1316	/* Calculate starting block number and offset inside it. */
1317	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1318	offWrite = (unsigned)uOffset & pImage->uBlockMask;
1319
1320	/* Clip write range to at most the rest of the block. */
1321	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
1322	Assert(!(cbToWrite % 512));
1323
1324	do
1325	{
1326	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
1327	{
1328	/* Block is either free or zero. */
1329	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
1330	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
1331	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
1332	{
1333	/* If the destination block is unallocated at this point, it's
1334	* either a zero block or a block which hasn't been used so far
1335	* (which also means that it's a zero block. Don't need to write
1336	* anything to this block if the data consists of just zeroes. */
1337	Assert(!(cbToWrite % 4));
1338	Assert(cbToWrite * 8 <= UINT32_MAX);
1339	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
1340	{
1341	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
1342	break;
1343	}
1344	}
1345
1346	if (cbToWrite == getImageBlockSize(&pImage->Header))
1347	{
1348	/* Full block write to previously unallocated block.
1349	* Allocate block and write data. */
1350	Assert(!offWrite);
1351	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
1352	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
1353	+ (pImage->offStartData + pImage->offStartBlockData);
1354	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1355	if (RT_FAILURE(rc))
1356	goto out;
1357	pImage->paBlocks[uBlock] = cBlocksAllocated;
1358	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
1359
1360	rc = vdiUpdateBlockInfo(pImage, uBlock);
1361	if (RT_FAILURE(rc))
1362	goto out;
1363
1364	*pcbPreRead = 0;
1365	*pcbPostRead = 0;
1366	}
1367	else
1368	{
1369	/* Trying to do a partial write to an unallocated block. Don't do
1370	* anything except letting the upper layer know what to do. */
1371	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
1372	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
1373	rc = VERR_VD_BLOCK_FREE;
1374	}
1375	}
1376	else
1377	{
1378	/* Block present in image file, write relevant data. */
1379	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1380	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
1381	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1382	}
1383	} while (0);
1384
1385	if (pcbWriteProcess)
1386	*pcbWriteProcess = cbToWrite;
1387
1388	out:
1389	LogFlowFunc(("returns %Rrc\n", rc));
1390	return rc;
1391	}
1392
1393	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1394	static int vdiFlush(void *pBackendData)
1395	{
1396	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1397	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1398	int rc = VINF_SUCCESS;
1399
1400	Assert(pImage);
1401
1402	vdiFlushImage(pImage);
1403	LogFlowFunc(("returns %Rrc\n", rc));
1404	return rc;
1405	}
1406
1407	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
1408	static unsigned vdiGetVersion(void *pBackendData)
1409	{
1410	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1411	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1412	unsigned uVersion;
1413
1414	AssertPtr(pImage);
1415
1416	if (pImage)
1417	uVersion = pImage->PreHeader.u32Version;
1418	else
1419	uVersion = 0;
1420
1421	LogFlowFunc(("returns %#x\n", uVersion));
1422	return uVersion;
1423	}
1424
1425	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
1426	static uint64_t vdiGetSize(void *pBackendData)
1427	{
1428	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1429	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1430	uint64_t cbSize;
1431
1432	AssertPtr(pImage);
1433
1434	if (pImage)
1435	cbSize = getImageDiskSize(&pImage->Header);
1436	else
1437	cbSize = 0;
1438
1439	LogFlowFunc(("returns %llu\n", cbSize));
1440	return cbSize;
1441	}
1442
1443	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
1444	static uint64_t vdiGetFileSize(void *pBackendData)
1445	{
1446	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1447	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1448	uint64_t cb = 0;
1449
1450	AssertPtr(pImage);
1451
1452	if (pImage)
1453	{
1454	uint64_t cbFile;
1455	if (pImage->pStorage)
1456	{
1457	int rc = vdiFileGetSize(pImage, &cbFile);
1458	if (RT_SUCCESS(rc))
1459	cb += cbFile;
1460	}
1461	}
1462
1463	LogFlowFunc(("returns %lld\n", cb));
1464	return cb;
1465	}
1466
1467	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
1468	static int vdiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1469	{
1470	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1471	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1472	int rc;
1473
1474	AssertPtr(pImage);
1475
1476	if (pImage)
1477	{
1478	if (pImage->PCHSGeometry.cCylinders)
1479	{
1480	*pPCHSGeometry = pImage->PCHSGeometry;
1481	rc = VINF_SUCCESS;
1482	}
1483	else
1484	rc = VERR_VD_GEOMETRY_NOT_SET;
1485	}
1486	else
1487	rc = VERR_VD_NOT_OPENED;
1488
1489	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1490	return rc;
1491	}
1492
1493	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
1494	static int vdiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1495	{
1496	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1497	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1498	int rc;
1499
1500	AssertPtr(pImage);
1501
1502	if (pImage)
1503	{
1504	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1505	{
1506	rc = VERR_VD_IMAGE_READ_ONLY;
1507	goto out;
1508	}
1509
1510	pImage->PCHSGeometry = *pPCHSGeometry;
1511	rc = VINF_SUCCESS;
1512	}
1513	else
1514	rc = VERR_VD_NOT_OPENED;
1515
1516	out:
1517	LogFlowFunc(("returns %Rrc\n", rc));
1518	return rc;
1519	}
1520
1521	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
1522	static int vdiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1523	{
1524	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1525	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1526	int rc;
1527
1528	AssertPtr(pImage);
1529
1530	if (pImage)
1531	{
1532	VDIDISKGEOMETRY DummyGeo = { 0, 0, 0, VDI_GEOMETRY_SECTOR_SIZE };
1533	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
1534	if (!pGeometry)
1535	pGeometry = &DummyGeo;
1536
1537	if ( pGeometry->cCylinders > 0
1538	&& pGeometry->cHeads > 0
1539	&& pGeometry->cSectors > 0)
1540	{
1541	pLCHSGeometry->cCylinders = pGeometry->cCylinders;
1542	pLCHSGeometry->cHeads = pGeometry->cHeads;
1543	pLCHSGeometry->cSectors = pGeometry->cSectors;
1544	rc = VINF_SUCCESS;
1545	}
1546	else
1547	rc = VERR_VD_GEOMETRY_NOT_SET;
1548	}
1549	else
1550	rc = VERR_VD_NOT_OPENED;
1551
1552	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1553	return rc;
1554	}
1555
1556	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
1557	static int vdiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1558	{
1559	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1560	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1561	PVDIDISKGEOMETRY pGeometry;
1562	int rc;
1563
1564	AssertPtr(pImage);
1565
1566	if (pImage)
1567	{
1568	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1569	{
1570	rc = VERR_VD_IMAGE_READ_ONLY;
1571	goto out;
1572	}
1573
1574	pGeometry = getImageLCHSGeometry(&pImage->Header);
1575	if (pGeometry)
1576	{
1577	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
1578	pGeometry->cHeads = pLCHSGeometry->cHeads;
1579	pGeometry->cSectors = pLCHSGeometry->cSectors;
1580	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
1581
1582	/* Update header information in base image file. */
1583	vdiFlushImage(pImage);
1584	}
1585	rc = VINF_SUCCESS;
1586	}
1587	else
1588	rc = VERR_VD_NOT_OPENED;
1589
1590	out:
1591	LogFlowFunc(("returns %Rrc\n", rc));
1592	return rc;
1593	}
1594
1595	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
1596	static unsigned vdiGetImageFlags(void *pBackendData)
1597	{
1598	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1599	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1600	unsigned uImageFlags;
1601
1602	AssertPtr(pImage);
1603
1604	if (pImage)
1605	uImageFlags = pImage->uImageFlags;
1606	else
1607	uImageFlags = 0;
1608
1609	LogFlowFunc(("returns %#x\n", uImageFlags));
1610	return uImageFlags;
1611	}
1612
1613	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
1614	static unsigned vdiGetOpenFlags(void *pBackendData)
1615	{
1616	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1617	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1618	unsigned uOpenFlags;
1619
1620	AssertPtr(pImage);
1621
1622	if (pImage)
1623	uOpenFlags = pImage->uOpenFlags;
1624	else
1625	uOpenFlags = 0;
1626
1627	LogFlowFunc(("returns %#x\n", uOpenFlags));
1628	return uOpenFlags;
1629	}
1630
1631	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
1632	static int vdiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
1633	{
1634	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
1635	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1636	int rc;
1637	const char *pszFilename;
1638
1639	/* Image must be opened and the new flags must be valid. */
1640	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE \| VD_OPEN_FLAGS_SEQUENTIAL)))
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	/* Make this foolproof even if the image doesn't have the zero
1672	* termination. With some luck the repaired header will be saved. */
1673	size_t cb = RTStrNLen(pszTmp, VDI_IMAGE_COMMENT_SIZE);
1674	if (cb == VDI_IMAGE_COMMENT_SIZE)
1675	{
1676	pszTmp[VDI_IMAGE_COMMENT_SIZE-1] = '\0';
1677	cb--;
1678	}
1679	if (cb < cbComment)
1680	{
1681	/* memcpy is much better than strncpy. */
1682	memcpy(pszComment, pszTmp, cb + 1);
1683	}
1684	else
1685	rc = VERR_BUFFER_OVERFLOW;
1686	}
1687	else
1688	rc = VERR_VD_NOT_OPENED;
1689
1690	LogFlowFunc(("returns %Rrc comment=\"%s\"\n", rc, pszComment));
1691	return rc;
1692	}
1693
1694	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1695	static int vdiSetComment(void pBackendData, const char pszComment)
1696	{
1697	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
1698	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1699	int rc;
1700
1701	AssertPtr(pImage);
1702
1703	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1704	{
1705	rc = VERR_VD_IMAGE_READ_ONLY;
1706	goto out;
1707	}
1708
1709	if (pImage)
1710	{
1711	size_t cchComment = pszComment ? strlen(pszComment) : 0;
1712	if (cchComment >= VDI_IMAGE_COMMENT_SIZE)
1713	{
1714	LogFunc(("pszComment is too long, %d bytes!\n", cchComment));
1715	rc = VERR_VD_VDI_COMMENT_TOO_LONG;
1716	goto out;
1717	}
1718
1719	/* we don't support old style images */
1720	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1721	{
1722	/*
1723	* Update the comment field, making sure to zero out all of the previous comment.
1724	*/
1725	memset(pImage->Header.u.v1.szComment, '\0', VDI_IMAGE_COMMENT_SIZE);
1726	memcpy(pImage->Header.u.v1.szComment, pszComment, cchComment);
1727
1728	/* write out new the header */
1729	rc = vdiUpdateHeader(pImage);
1730	}
1731	else
1732	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1733	}
1734	else
1735	rc = VERR_VD_NOT_OPENED;
1736
1737	out:
1738	LogFlowFunc(("returns %Rrc\n", rc));
1739	return rc;
1740	}
1741
1742	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
1743	static int vdiGetUuid(void *pBackendData, PRTUUID pUuid)
1744	{
1745	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1746	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1747	int rc;
1748
1749	AssertPtr(pImage);
1750
1751	if (pImage)
1752	{
1753	pUuid = getImageCreationUUID(&pImage->Header);
1754	rc = VINF_SUCCESS;
1755	}
1756	else
1757	rc = VERR_VD_NOT_OPENED;
1758
1759	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1760	return rc;
1761	}
1762
1763	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
1764	static int vdiSetUuid(void *pBackendData, PCRTUUID pUuid)
1765	{
1766	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1767	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1768	int rc = VINF_SUCCESS;
1769
1770	AssertPtr(pImage);
1771
1772	if (pImage)
1773	{
1774	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1775	{
1776	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1777	pImage->Header.u.v1.uuidCreate = *pUuid;
1778	/* Make it possible to clone old VDIs. */
1779	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1780	pImage->Header.u.v0.uuidCreate = *pUuid;
1781	else
1782	{
1783	LogFunc(("Version is not supported!\n"));
1784	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1785	}
1786	}
1787	else
1788	rc = VERR_VD_IMAGE_READ_ONLY;
1789	}
1790	else
1791	rc = VERR_VD_NOT_OPENED;
1792
1793	LogFlowFunc(("returns %Rrc\n", rc));
1794	return rc;
1795	}
1796
1797	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
1798	static int vdiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
1799	{
1800	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1801	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1802	int rc;
1803
1804	AssertPtr(pImage);
1805
1806	if (pImage)
1807	{
1808	pUuid = getImageModificationUUID(&pImage->Header);
1809	rc = VINF_SUCCESS;
1810	}
1811	else
1812	rc = VERR_VD_NOT_OPENED;
1813
1814	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1815	return rc;
1816	}
1817
1818	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
1819	static int vdiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
1820	{
1821	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1822	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1823	int rc = VINF_SUCCESS;
1824
1825	AssertPtr(pImage);
1826
1827	if (pImage)
1828	{
1829	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1830	{
1831	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1832	pImage->Header.u.v1.uuidModify = *pUuid;
1833	/* Make it possible to clone old VDIs. */
1834	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1835	pImage->Header.u.v0.uuidModify = *pUuid;
1836	else
1837	{
1838	LogFunc(("Version is not supported!\n"));
1839	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1840	}
1841	}
1842	else
1843	rc = VERR_VD_IMAGE_READ_ONLY;
1844	}
1845	else
1846	rc = VERR_VD_NOT_OPENED;
1847
1848	LogFlowFunc(("returns %Rrc\n", rc));
1849	return rc;
1850	}
1851
1852	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
1853	static int vdiGetParentUuid(void *pBackendData, PRTUUID pUuid)
1854	{
1855	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1856	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1857	int rc;
1858
1859	AssertPtr(pImage);
1860
1861	if (pImage)
1862	{
1863	pUuid = getImageParentUUID(&pImage->Header);
1864	rc = VINF_SUCCESS;
1865	}
1866	else
1867	rc = VERR_VD_NOT_OPENED;
1868
1869	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1870	return rc;
1871	}
1872
1873	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
1874	static int vdiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
1875	{
1876	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1877	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1878	int rc = VINF_SUCCESS;
1879
1880	AssertPtr(pImage);
1881
1882	if (pImage)
1883	{
1884	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1885	{
1886	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1887	pImage->Header.u.v1.uuidLinkage = *pUuid;
1888	/* Make it possible to clone old VDIs. */
1889	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1890	pImage->Header.u.v0.uuidLinkage = *pUuid;
1891	else
1892	{
1893	LogFunc(("Version is not supported!\n"));
1894	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1895	}
1896	}
1897	else
1898	rc = VERR_VD_IMAGE_READ_ONLY;
1899	}
1900	else
1901	rc = VERR_VD_NOT_OPENED;
1902
1903	LogFlowFunc(("returns %Rrc\n", rc));
1904	return rc;
1905	}
1906
1907	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
1908	static int vdiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
1909	{
1910	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1911	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1912	int rc;
1913
1914	AssertPtr(pImage);
1915
1916	if (pImage)
1917	{
1918	pUuid = getImageParentModificationUUID(&pImage->Header);
1919	rc = VINF_SUCCESS;
1920	}
1921	else
1922	rc = VERR_VD_NOT_OPENED;
1923
1924	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1925	return rc;
1926	}
1927
1928	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
1929	static int vdiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
1930	{
1931	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1932	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1933	int rc = VINF_SUCCESS;
1934
1935	AssertPtr(pImage);
1936
1937	if (pImage)
1938	{
1939	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1940	{
1941	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1942	pImage->Header.u.v1.uuidParentModify = *pUuid;
1943	else
1944	{
1945	LogFunc(("Version is not supported!\n"));
1946	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1947	}
1948	}
1949	else
1950	rc = VERR_VD_IMAGE_READ_ONLY;
1951	}
1952	else
1953	rc = VERR_VD_NOT_OPENED;
1954
1955	LogFlowFunc(("returns %Rrc\n", rc));
1956	return rc;
1957	}
1958
1959	/** @copydoc VBOXHDDBACKEND::pfnDump */
1960	static void vdiDump(void *pBackendData)
1961	{
1962	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1963
1964	vdiMessage(pImage, "Dumping VDI image \"%s\" mode=%s uOpenFlags=%X File=%#p\n",
1965	pImage->pszFilename,
1966	(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) ? "r/o" : "r/w",
1967	pImage->uOpenFlags,
1968	pImage->pStorage);
1969	vdiMessage(pImage, "Header: Version=%08X Type=%X Flags=%X Size=%llu\n",
1970	pImage->PreHeader.u32Version,
1971	getImageType(&pImage->Header),
1972	getImageFlags(&pImage->Header),
1973	getImageDiskSize(&pImage->Header));
1974	vdiMessage(pImage, "Header: cbBlock=%u cbBlockExtra=%u cBlocks=%u cBlocksAllocated=%u\n",
1975	getImageBlockSize(&pImage->Header),
1976	getImageExtraBlockSize(&pImage->Header),
1977	getImageBlocks(&pImage->Header),
1978	getImageBlocksAllocated(&pImage->Header));
1979	vdiMessage(pImage, "Header: offBlocks=%u offData=%u\n",
1980	getImageBlocksOffset(&pImage->Header),
1981	getImageDataOffset(&pImage->Header));
1982	PVDIDISKGEOMETRY pg = getImageLCHSGeometry(&pImage->Header);
1983	if (pg)
1984	vdiMessage(pImage, "Header: Geometry: C/H/S=%u/%u/%u cbSector=%u\n",
1985	pg->cCylinders, pg->cHeads, pg->cSectors, pg->cbSector);
1986	vdiMessage(pImage, "Header: uuidCreation={%RTuuid}\n", getImageCreationUUID(&pImage->Header));
1987	vdiMessage(pImage, "Header: uuidModification={%RTuuid}\n", getImageModificationUUID(&pImage->Header));
1988	vdiMessage(pImage, "Header: uuidParent={%RTuuid}\n", getImageParentUUID(&pImage->Header));
1989	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) >= 1)
1990	vdiMessage(pImage, "Header: uuidParentModification={%RTuuid}\n", getImageParentModificationUUID(&pImage->Header));
1991	vdiMessage(pImage, "Image: fFlags=%08X offStartBlocks=%u offStartData=%u\n",
1992	pImage->uImageFlags, pImage->offStartBlocks, pImage->offStartData);
1993	vdiMessage(pImage, "Image: uBlockMask=%08X cbTotalBlockData=%u uShiftOffset2Index=%u offStartBlockData=%u\n",
1994	pImage->uBlockMask,
1995	pImage->cbTotalBlockData,
1996	pImage->uShiftOffset2Index,
1997	pImage->offStartBlockData);
1998
1999	unsigned uBlock, cBlocksNotFree, cBadBlocks, cBlocks = getImageBlocks(&pImage->Header);
2000	for (uBlock=0, cBlocksNotFree=0, cBadBlocks=0; uBlock<cBlocks; uBlock++)
2001	{
2002	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2003	{
2004	cBlocksNotFree++;
2005	if (pImage->paBlocks[uBlock] >= cBlocks)
2006	cBadBlocks++;
2007	}
2008	}
2009	if (cBlocksNotFree != getImageBlocksAllocated(&pImage->Header))
2010	{
2011	vdiMessage(pImage, "!! WARNING: %u blocks actually allocated (cBlocksAllocated=%u) !!\n",
2012	cBlocksNotFree, getImageBlocksAllocated(&pImage->Header));
2013	}
2014	if (cBadBlocks)
2015	{
2016	vdiMessage(pImage, "!! WARNING: %u bad blocks found !!\n",
2017	cBadBlocks);
2018	}
2019	}
2020
2021	static bool vdiIsAsyncIOSupported(void *pBackendData)
2022	{
2023	return true;
2024	}
2025
2026	static int vdiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
2027	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
2028	{
2029	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
2030	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
2031	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2032	unsigned uBlock;
2033	unsigned offRead;
2034	int rc;
2035
2036	AssertPtr(pImage);
2037	Assert(!(uOffset % 512));
2038	Assert(!(cbToRead % 512));
2039
2040	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
2041	\|\| !VALID_PTR(pIoCtx)
2042	\|\| !cbToRead)
2043	{
2044	rc = VERR_INVALID_PARAMETER;
2045	goto out;
2046	}
2047
2048	/* Calculate starting block number and offset inside it. */
2049	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2050	offRead = (unsigned)uOffset & pImage->uBlockMask;
2051
2052	/* Clip read range to at most the rest of the block. */
2053	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
2054	Assert(!(cbToRead % 512));
2055
2056	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
2057	rc = VERR_VD_BLOCK_FREE;
2058	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
2059	{
2060	size_t cbSet;
2061
2062	cbSet = vdiFileIoCtxSet(pImage, pIoCtx, 0, cbToRead);
2063	Assert(cbSet == cbToRead);
2064
2065	rc = VINF_SUCCESS;
2066	}
2067	else
2068	{
2069	/* Block present in image file, read relevant data. */
2070	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2071	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
2072	rc = vdiFileReadUserAsync(pImage, u64Offset, pIoCtx, cbToRead);
2073	}
2074
2075	if (pcbActuallyRead)
2076	*pcbActuallyRead = cbToRead;
2077
2078	out:
2079	LogFlowFunc(("returns %Rrc\n", rc));
2080	return rc;
2081	}
2082
2083	static int vdiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
2084	PVDIOCTX pIoCtx,
2085	size_t pcbWriteProcess, size_t pcbPreRead,
2086	size_t *pcbPostRead, unsigned fWrite)
2087	{
2088	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
2089	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2090	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2091	unsigned uBlock;
2092	unsigned offWrite;
2093	int rc = VINF_SUCCESS;
2094
2095	AssertPtr(pImage);
2096	Assert(!(uOffset % 512));
2097	Assert(!(cbToWrite % 512));
2098
2099	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2100	{
2101	rc = VERR_VD_IMAGE_READ_ONLY;
2102	goto out;
2103	}
2104
2105	if (!VALID_PTR(pIoCtx) \|\| !cbToWrite)
2106	{
2107	rc = VERR_INVALID_PARAMETER;
2108	goto out;
2109	}
2110
2111	/* No size check here, will do that later. For dynamic images which are
2112	* not multiples of the block size in length, this would prevent writing to
2113	* the last block. */
2114
2115	/* Calculate starting block number and offset inside it. */
2116	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2117	offWrite = (unsigned)uOffset & pImage->uBlockMask;
2118
2119	/* Clip write range to at most the rest of the block. */
2120	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
2121	Assert(!(cbToWrite % 512));
2122
2123	do
2124	{
2125	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2126	{
2127	/* Block is either free or zero. */
2128	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
2129	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
2130	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
2131	{
2132	#if 0 /** @todo Provide interface to check an I/O context for a specific value */
2133	/* If the destination block is unallocated at this point, it's
2134	* either a zero block or a block which hasn't been used so far
2135	* (which also means that it's a zero block. Don't need to write
2136	* anything to this block if the data consists of just zeroes. */
2137	Assert(!(cbToWrite % 4));
2138	Assert(cbToWrite * 8 <= UINT32_MAX);
2139	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
2140	{
2141	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
2142	break;
2143	}
2144	#endif
2145	}
2146
2147	if ( cbToWrite == getImageBlockSize(&pImage->Header)
2148	&& !(fWrite & VD_WRITE_NO_ALLOC))
2149	{
2150	/* Full block write to previously unallocated block.
2151	* Allocate block and write data. */
2152	Assert(!offWrite);
2153	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
2154	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
2155	+ (pImage->offStartData + pImage->offStartBlockData);
2156	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2157	if (RT_UNLIKELY(RT_FAILURE_NP(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS)))
2158	goto out;
2159	pImage->paBlocks[uBlock] = cBlocksAllocated;
2160	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
2161
2162	rc = vdiUpdateBlockInfoAsync(pImage, uBlock, pIoCtx);
2163	if (RT_FAILURE(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS))
2164	goto out;
2165
2166	*pcbPreRead = 0;
2167	*pcbPostRead = 0;
2168	}
2169	else
2170	{
2171	/* Trying to do a partial write to an unallocated block. Don't do
2172	* anything except letting the upper layer know what to do. */
2173	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
2174	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
2175	rc = VERR_VD_BLOCK_FREE;
2176	}
2177	}
2178	else
2179	{
2180	/* Block present in image file, write relevant data. */
2181	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2182	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
2183	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2184	}
2185	} while (0);
2186
2187	if (pcbWriteProcess)
2188	*pcbWriteProcess = cbToWrite;
2189
2190	out:
2191	LogFlowFunc(("returns %Rrc\n", rc));
2192	return rc;
2193	}
2194
2195	static int vdiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
2196	{
2197	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2198	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2199	int rc = VINF_SUCCESS;
2200
2201	Assert(pImage);
2202
2203	rc = vdiFlushImageAsync(pImage, pIoCtx);
2204	LogFlowFunc(("returns %Rrc\n", rc));
2205	return rc;
2206	}
2207
2208	/** @copydoc VBOXHDDBACKEND::pfnCompact */
2209	static int vdiCompact(void *pBackendData, unsigned uPercentStart,
2210	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2211	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2212	{
2213	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2214	int rc = VINF_SUCCESS;
2215	void pvBuf = NULL, pvTmp = NULL;
2216	unsigned *paBlocks2 = NULL;
2217
2218	int (pfnParentRead)(void , uint64_t, void *, size_t) = NULL;
2219	void *pvParent = NULL;
2220	PVDINTERFACE pIfParentState = VDInterfaceGet(pVDIfsOperation,
2221	VDINTERFACETYPE_PARENTSTATE);
2222	PVDINTERFACEPARENTSTATE pCbParentState = NULL;
2223	if (pIfParentState)
2224	{
2225	pCbParentState = VDGetInterfaceParentState(pIfParentState);
2226	if (pCbParentState)
2227	pfnParentRead = pCbParentState->pfnParentRead;
2228	pvParent = pIfParentState->pvUser;
2229	}
2230
2231	PFNVDPROGRESS pfnProgress = NULL;
2232	void *pvUser = NULL;
2233	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2234	VDINTERFACETYPE_PROGRESS);
2235	PVDINTERFACEPROGRESS pCbProgress = NULL;
2236	if (pIfProgress)
2237	{
2238	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2239	if (pCbProgress)
2240	pfnProgress = pCbProgress->pfnProgress;
2241	pvUser = pIfProgress->pvUser;
2242	}
2243
2244	do {
2245	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2246
2247	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2248	rc = VERR_VD_IMAGE_READ_ONLY);
2249
2250	unsigned cBlocks;
2251	unsigned cBlocksToMove = 0;
2252	size_t cbBlock;
2253	cBlocks = getImageBlocks(&pImage->Header);
2254	cbBlock = getImageBlockSize(&pImage->Header);
2255	if (pfnParentRead)
2256	{
2257	pvBuf = RTMemTmpAlloc(cbBlock);
2258	AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);
2259	}
2260	pvTmp = RTMemTmpAlloc(cbBlock);
2261	AssertBreakStmt(VALID_PTR(pvTmp), rc = VERR_NO_MEMORY);
2262
2263	uint64_t cbFile;
2264	rc = vdiFileGetSize(pImage, &cbFile);
2265	AssertRCBreak(rc);
2266	unsigned cBlocksAllocated = (unsigned)((cbFile - pImage->offStartData - pImage->offStartBlockData) >> pImage->uShiftOffset2Index);
2267	if (cBlocksAllocated == 0)
2268	{
2269	/* No data blocks in this image, no need to compact. */
2270	rc = VINF_SUCCESS;
2271	break;
2272	}
2273
2274	/* Allocate block array for back resolving. */
2275	paBlocks2 = (unsigned )RTMemAlloc(sizeof(unsigned ) * cBlocksAllocated);
2276	AssertBreakStmt(VALID_PTR(paBlocks2), rc = VERR_NO_MEMORY);
2277	/* Fill out back resolving, check/fix allocation errors before
2278	* compacting the image, just to be on the safe side. Update the
2279	* image contents straight away, as this enables cancelling. */
2280	for (unsigned i = 0; i < cBlocksAllocated; i++)
2281	paBlocks2[i] = VDI_IMAGE_BLOCK_FREE;
2282	rc = VINF_SUCCESS;
2283	for (unsigned i = 0; i < cBlocks; i++)
2284	{
2285	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2286	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2287	{
2288	if (ptrBlock < cBlocksAllocated)
2289	{
2290	if (paBlocks2[ptrBlock] == VDI_IMAGE_BLOCK_FREE)
2291	paBlocks2[ptrBlock] = i;
2292	else
2293	{
2294	LogFunc(("Freed cross-linked block %u in file \"%s\"\n",
2295	i, pImage->pszFilename));
2296	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2297	rc = vdiUpdateBlockInfo(pImage, i);
2298	if (RT_FAILURE(rc))
2299	break;
2300	}
2301	}
2302	else
2303	{
2304	LogFunc(("Freed out of bounds reference for block %u in file \"%s\"\n",
2305	i, pImage->pszFilename));
2306	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2307	rc = vdiUpdateBlockInfo(pImage, i);
2308	if (RT_FAILURE(rc))
2309	break;
2310	}
2311	}
2312	}
2313	if (RT_FAILURE(rc))
2314	break;
2315
2316	/* Find redundant information and update the block pointers
2317	* accordingly, creating bubbles. Keep disk up to date, as this
2318	* enables cancelling. */
2319	for (unsigned i = 0; i < cBlocks; i++)
2320	{
2321	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2322	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2323	{
2324	/* Block present in image file, read relevant data. */
2325	uint64_t u64Offset = (uint64_t)ptrBlock * pImage->cbTotalBlockData
2326	+ (pImage->offStartData + pImage->offStartBlockData);
2327	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2328	if (RT_FAILURE(rc))
2329	break;
2330
2331	if (ASMBitFirstSet((volatile void )pvTmp, (uint32_t)cbBlock 8) == -1)
2332	{
2333	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_ZERO;
2334	rc = vdiUpdateBlockInfo(pImage, i);
2335	if (RT_FAILURE(rc))
2336	break;
2337	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2338	/* Adjust progress info, one block to be relocated. */
2339	cBlocksToMove++;
2340	}
2341	else if (pfnParentRead)
2342	{
2343	rc = pfnParentRead(pvParent, i * cbBlock, pvBuf, cbBlock);
2344	if (RT_FAILURE(rc))
2345	break;
2346	if (!memcmp(pvTmp, pvBuf, cbBlock))
2347	{
2348	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2349	rc = vdiUpdateBlockInfo(pImage, i);
2350	if (RT_FAILURE(rc))
2351	break;
2352	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2353	/* Adjust progress info, one block to be relocated. */
2354	cBlocksToMove++;
2355	}
2356	}
2357	}
2358
2359	if (pCbProgress && pCbProgress->pfnProgress)
2360	{
2361	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2362	(uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2363	if (RT_FAILURE(rc))
2364	break;
2365	}
2366	}
2367	if (RT_FAILURE(rc))
2368	break;
2369
2370	/* Fill bubbles with other data (if available). */
2371	unsigned cBlocksMoved = 0;
2372	unsigned uBlockUsedPos = cBlocksAllocated;
2373	for (unsigned i = 0; i < cBlocksAllocated; i++)
2374	{
2375	unsigned uBlock = paBlocks2[i];
2376	if (uBlock == VDI_IMAGE_BLOCK_FREE)
2377	{
2378	unsigned uBlockData = VDI_IMAGE_BLOCK_FREE;
2379	while (uBlockUsedPos > i && uBlockData == VDI_IMAGE_BLOCK_FREE)
2380	{
2381	uBlockUsedPos--;
2382	uBlockData = paBlocks2[uBlockUsedPos];
2383	}
2384	/* Terminate early if there is no block which needs copying. */
2385	if (uBlockUsedPos == i)
2386	break;
2387	uint64_t u64Offset = (uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2388	+ (pImage->offStartData + pImage->offStartBlockData);
2389	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2390	u64Offset = (uint64_t)i * pImage->cbTotalBlockData
2391	+ (pImage->offStartData + pImage->offStartBlockData);
2392	rc = vdiFileWriteSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2393	pImage->paBlocks[uBlockData] = i;
2394	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated - cBlocksMoved);
2395	rc = vdiUpdateBlockInfo(pImage, uBlockData);
2396	if (RT_FAILURE(rc))
2397	break;
2398	paBlocks2[i] = uBlockData;
2399	paBlocks2[uBlockUsedPos] = VDI_IMAGE_BLOCK_FREE;
2400	cBlocksMoved++;
2401	}
2402
2403	if (pCbProgress && pCbProgress->pfnProgress)
2404	{
2405	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2406	(uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2407
2408	if (RT_FAILURE(rc))
2409	break;
2410	}
2411	}
2412	if (RT_FAILURE(rc))
2413	break;
2414
2415	/* Update image header. */
2416	setImageBlocksAllocated(&pImage->Header, uBlockUsedPos);
2417	vdiUpdateHeader(pImage);
2418
2419	/* Truncate the image to the proper size to finish compacting. */
2420	rc = vdiFileSetSize(pImage,
2421	(uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2422	+ pImage->offStartData + pImage->offStartBlockData);
2423	} while (0);
2424
2425	if (paBlocks2)
2426	RTMemTmpFree(paBlocks2);
2427	if (pvTmp)
2428	RTMemTmpFree(pvTmp);
2429	if (pvBuf)
2430	RTMemTmpFree(pvBuf);
2431
2432	if (RT_SUCCESS(rc) && pCbProgress && pCbProgress->pfnProgress)
2433	{
2434	pCbProgress->pfnProgress(pIfProgress->pvUser,
2435	uPercentStart + uPercentSpan);
2436	}
2437
2438	LogFlowFunc(("returns %Rrc\n", rc));
2439	return rc;
2440	}
2441
2442
2443	/** @copydoc VBOXHDDBACKEND::pfnResize */
2444	static int vdiResize(void *pBackendData, uint64_t cbSize,
2445	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2446	unsigned uPercentStart, unsigned uPercentSpan,
2447	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2448	PVDINTERFACE pVDIfsOperation)
2449	{
2450	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2451	int rc = VINF_SUCCESS;
2452
2453	PFNVDPROGRESS pfnProgress = NULL;
2454	void *pvUser = NULL;
2455	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2456	VDINTERFACETYPE_PROGRESS);
2457	PVDINTERFACEPROGRESS pCbProgress = NULL;
2458	if (pIfProgress)
2459	{
2460	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2461	if (pCbProgress)
2462	pfnProgress = pCbProgress->pfnProgress;
2463	pvUser = pIfProgress->pvUser;
2464	}
2465
2466	/*
2467	* Making the image smaller is not supported at the moment.
2468	* Resizing is also not supported for fixed size images and
2469	* very old images.
2470	*/
2471	/** @todo implement making the image smaller, it is the responsibility of
2472	* the user to know what he's doing. */
2473	if ( cbSize < getImageDiskSize(&pImage->Header)
2474	\|\| GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0
2475	\|\| pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2476	rc = VERR_NOT_SUPPORTED;
2477	else if (cbSize > getImageDiskSize(&pImage->Header))
2478	{
2479	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header); /** < Blocks currently allocated, doesn't change during resize */
2480	uint32_t cBlocksNew = cbSize / getImageBlockSize(&pImage->Header); /** < New number of blocks in the image after the resize */
2481	if (cbSize % getImageBlockSize(&pImage->Header))
2482	cBlocksNew++;
2483
2484	uint32_t cBlocksOld = getImageBlocks(&pImage->Header); /** < Number of blocks before the resize. */
2485	uint64_t cbBlockspaceNew = cBlocksNew * sizeof(VDIIMAGEBLOCKPOINTER); /** < Required space for the block array after the resize. */
2486	uint64_t offStartDataNew = RT_ALIGN_32(pImage->offStartBlocks + cbBlockspaceNew, VDI_DATA_ALIGN); /** < New start offset for block data after the resize */
2487
2488	if ( pImage->offStartData != offStartDataNew
2489	&& cBlocksAllocated > 0)
2490	{
2491	/* Calculate how many sectors need to be relocated. */
2492	uint64_t cbOverlapping = offStartDataNew - pImage->offStartData;
2493	unsigned cBlocksReloc = cbOverlapping / getImageBlockSize(&pImage->Header);
2494	if (cbOverlapping % getImageBlockSize(&pImage->Header))
2495	cBlocksReloc++;
2496
2497	/* Since only full blocks can be relocated the new data start is
2498	* determined by moving it block by block. */
2499	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2500	offStartDataNew = pImage->offStartData;
2501
2502	/* Do the relocation. */
2503	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2504
2505	/*
2506	* Get the blocks we need to relocate first, they are appended to the end
2507	* of the image.
2508	*/
2509	void pvBuf = NULL, pvZero = NULL;
2510	do
2511	{
2512	VDIIMAGEBLOCKPOINTER uBlock = 0;
2513
2514	/* Allocate data buffer. */
2515	pvBuf = RTMemAllocZ(pImage->cbTotalBlockData);
2516	if (!pvBuf)
2517	{
2518	rc = VERR_NO_MEMORY;
2519	break;
2520	}
2521
2522	/* Allocate buffer for overwrting with zeroes. */
2523	pvZero = RTMemAllocZ(pImage->cbTotalBlockData);
2524	if (!pvZero)
2525	{
2526	rc = VERR_NO_MEMORY;
2527	break;
2528	}
2529
2530	for (unsigned i = 0; i < cBlocksReloc; i++)
2531	{
2532	/* Search the index in the block table. */
2533	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2534	{
2535	if (pImage->paBlocks[idxBlock] == uBlock)
2536	{
2537	/* Read data and append to the end of the image. */
2538	rc = vdiFileReadSync(pImage, offStartDataNew, pvBuf, pImage->cbTotalBlockData, NULL);
2539	if (RT_FAILURE(rc))
2540	break;
2541
2542	uint64_t offBlockAppend;
2543	rc = vdiFileGetSize(pImage, &offBlockAppend);
2544	if (RT_FAILURE(rc))
2545	break;
2546
2547	rc = vdiFileWriteSync(pImage, offBlockAppend, pvBuf, pImage->cbTotalBlockData, NULL);
2548	if (RT_FAILURE(rc))
2549	break;
2550
2551	/* Zero out the old block area. */
2552	rc = vdiFileWriteSync(pImage, offStartDataNew, pvZero, pImage->cbTotalBlockData, NULL);
2553	if (RT_FAILURE(rc))
2554	break;
2555
2556	/* Update block counter. */
2557	pImage->paBlocks[idxBlock] = cBlocksAllocated - 1;
2558
2559	/*
2560	* Decrease the block number of all other entries in the array.
2561	* They were moved one block to the front.
2562	* Doing it as a separate step iterating over the array again
2563	* because an error while relocating the block might end up
2564	* in a corrupted image otherwise.
2565	*/
2566	for (unsigned idxBlock2 = 0; idxBlock2 < cBlocksOld; idxBlock2++)
2567	{
2568	if ( idxBlock2 != idxBlock
2569	&& IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[idxBlock2]))
2570	pImage->paBlocks[idxBlock2]--;
2571	}
2572
2573	/* Continue with the next block. */
2574	break;
2575	}
2576	}
2577
2578	if (RT_FAILURE(rc))
2579	break;
2580
2581	uBlock++;
2582	offStartDataNew += pImage->cbTotalBlockData;
2583	}
2584	} while (0);
2585
2586	if (pvBuf)
2587	RTMemFree(pvBuf);
2588	if (pvZero)
2589	RTMemFree(pvZero);
2590	}
2591
2592	/*
2593	* We need to update the new offsets for the image data in the out of memory
2594	* case too because we relocated the blocks already.
2595	*/
2596	pImage->offStartData = offStartDataNew;
2597	setImageDataOffset(&pImage->Header, offStartDataNew);
2598
2599	/*
2600	* Relocation done, expand the block array and update the header with
2601	* the new data.
2602	*/
2603	if (RT_SUCCESS(rc))
2604	{
2605	PVDIIMAGEBLOCKPOINTER paBlocksNew = (PVDIIMAGEBLOCKPOINTER)RTMemRealloc(pImage->paBlocks, cbBlockspaceNew);
2606	if (paBlocksNew)
2607	{
2608	pImage->paBlocks = paBlocksNew;
2609
2610	/* Mark the new blocks as unallocated. */
2611	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
2612	pImage->paBlocks[idxBlock] = VDI_IMAGE_BLOCK_FREE;
2613	}
2614	else
2615	rc = VERR_NO_MEMORY;
2616
2617	/* Write the block array before updating the rest. */
2618	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
2619	cbBlockspaceNew, NULL);
2620
2621	if (RT_SUCCESS(rc))
2622	{
2623	/* Update size and new block count. */
2624	setImageDiskSize(&pImage->Header, cbSize);
2625	setImageBlocks(&pImage->Header, cBlocksNew);
2626	/* Update geometry. */
2627	pImage->PCHSGeometry = *pPCHSGeometry;
2628
2629	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
2630	if (pGeometry)
2631	{
2632	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
2633	pGeometry->cHeads = pLCHSGeometry->cHeads;
2634	pGeometry->cSectors = pLCHSGeometry->cSectors;
2635	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
2636	}
2637	}
2638	}
2639
2640	/* Update header information in base image file. */
2641	vdiFlushImage(pImage);
2642	}
2643	/* Same size doesn't change the image at all. */
2644
2645	LogFlowFunc(("returns %Rrc\n", rc));
2646	return rc;
2647	}
2648
2649
2650	VBOXHDDBACKEND g_VDIBackend =
2651	{
2652	/* pszBackendName */
2653	"VDI",
2654	/* cbSize */
2655	sizeof(VBOXHDDBACKEND),
2656	/* uBackendCaps */
2657	VD_CAP_UUID \| VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC
2658	\| VD_CAP_DIFF \| VD_CAP_FILE \| VD_CAP_ASYNC \| VD_CAP_VFS,
2659	/* papszFileExtensions */
2660	s_apszVdiFileExtensions,
2661	/* paConfigInfo */
2662	NULL,
2663	/* hPlugin */
2664	NIL_RTLDRMOD,
2665	/* pfnCheckIfValid */
2666	vdiCheckIfValid,
2667	/* pfnOpen */
2668	vdiOpen,
2669	/* pfnCreate */
2670	vdiCreate,
2671	/* pfnRename */
2672	vdiRename,
2673	/* pfnClose */
2674	vdiClose,
2675	/* pfnRead */
2676	vdiRead,
2677	/* pfnWrite */
2678	vdiWrite,
2679	/* pfnFlush */
2680	vdiFlush,
2681	/* pfnGetVersion */
2682	vdiGetVersion,
2683	/* pfnGetSize */
2684	vdiGetSize,
2685	/* pfnGetFileSize */
2686	vdiGetFileSize,
2687	/* pfnGetPCHSGeometry */
2688	vdiGetPCHSGeometry,
2689	/* pfnSetPCHSGeometry */
2690	vdiSetPCHSGeometry,
2691	/* pfnGetLCHSGeometry */
2692	vdiGetLCHSGeometry,
2693	/* pfnSetLCHSGeometry */
2694	vdiSetLCHSGeometry,
2695	/* pfnGetImageFlags */
2696	vdiGetImageFlags,
2697	/* pfnGetOpenFlags */
2698	vdiGetOpenFlags,
2699	/* pfnSetOpenFlags */
2700	vdiSetOpenFlags,
2701	/* pfnGetComment */
2702	vdiGetComment,
2703	/* pfnSetComment */
2704	vdiSetComment,
2705	/* pfnGetUuid */
2706	vdiGetUuid,
2707	/* pfnSetUuid */
2708	vdiSetUuid,
2709	/* pfnGetModificationUuid */
2710	vdiGetModificationUuid,
2711	/* pfnSetModificationUuid */
2712	vdiSetModificationUuid,
2713	/* pfnGetParentUuid */
2714	vdiGetParentUuid,
2715	/* pfnSetParentUuid */
2716	vdiSetParentUuid,
2717	/* pfnGetParentModificationUuid */
2718	vdiGetParentModificationUuid,
2719	/* pfnSetParentModificationUuid */
2720	vdiSetParentModificationUuid,
2721	/* pfnDump */
2722	vdiDump,
2723	/* pfnGetTimeStamp */
2724	NULL,
2725	/* pfnGetParentTimeStamp */
2726	NULL,
2727	/* pfnSetParentTimeStamp */
2728	NULL,
2729	/* pfnGetParentFilename */
2730	NULL,
2731	/* pfnSetParentFilename */
2732	NULL,
2733	/* pfnIsAsyncIOSupported */
2734	vdiIsAsyncIOSupported,
2735	/* pfnAsyncRead */
2736	vdiAsyncRead,
2737	/* pfnAsyncWrite */
2738	vdiAsyncWrite,
2739	/* pfnAsyncFlush */
2740	vdiAsyncFlush,
2741	/* pfnComposeLocation */
2742	genericFileComposeLocation,
2743	/* pfnComposeName */
2744	genericFileComposeName,
2745	/* pfnCompact */
2746	vdiCompact,
2747	/* pfnResize */
2748	vdiResize
2749	};

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source: vbox/trunk/src/VBox/Devices/Storage/VDIHDDCore.cpp@ 33481

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