VDI.cpp@ 37483

Last change on this file since 37483 was 37483, checked in by vboxsync, 14 years ago
Storage/{VDI,VMDK}: Refuse to create an image with an invalid image type (e.g. Split2G for VDI images)
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 95.6 KB

Line
1	/** @file
2	* Virtual Disk Image (VDI), Core Code.
3	*/
4
5	/*
6	* Copyright (C) 2006-2011 Oracle Corporation
7	*
8	* This file is part of VirtualBox Open Source Edition (OSE), as
9	* available from http://www.virtualbox.org. This file is free software;
10	* you can redistribute it and/or modify it under the terms of the GNU
11	* General Public License (GPL) as published by the Free Software
12	* Foundation, in version 2 as it comes in the "COPYING" file of the
13	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	*/
16
17	/*******************************************************************************
18	* Header Files *
19	*******************************************************************************/
20	#define LOG_GROUP LOG_GROUP_VD_VDI
21	#include <VBox/vd-plugin.h>
22	#define VBOX_VDICORE_VD /* Signal that the header is included from here. */
23	#include "VDICore.h"
24	#include <VBox/err.h>
25
26	#include <VBox/log.h>
27	#include <iprt/alloc.h>
28	#include <iprt/assert.h>
29	#include <iprt/uuid.h>
30	#include <iprt/string.h>
31	#include <iprt/asm.h>
32
33	#define VDI_IMAGE_DEFAULT_BLOCK_SIZE _1M
34
35	/*******************************************************************************
36	* Static Variables *
37	*******************************************************************************/
38
39	/** NULL-terminated array of supported file extensions. */
40	static const VDFILEEXTENSION s_aVdiFileExtensions[] =
41	{
42	{"vdi", VDTYPE_HDD},
43	{NULL, VDTYPE_INVALID}
44	};
45
46	/*******************************************************************************
47	* Internal Functions *
48	*******************************************************************************/
49	static unsigned getPowerOfTwo(unsigned uNumber);
50	static void vdiInitPreHeader(PVDIPREHEADER pPreHdr);
51	static int vdiValidatePreHeader(PVDIPREHEADER pPreHdr);
52	static void vdiInitHeader(PVDIHEADER pHeader, uint32_t uImageFlags,
53	const char *pszComment, uint64_t cbDisk,
54	uint32_t cbBlock, uint32_t cbBlockExtra);
55	static int vdiValidateHeader(PVDIHEADER pHeader);
56	static void vdiSetupImageDesc(PVDIIMAGEDESC pImage);
57	static int vdiUpdateHeader(PVDIIMAGEDESC pImage);
58	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock);
59	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx);
60	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock, PVDIOCTX pIoCtx);
61
62	/**
63	* Internal: signal an error to the frontend.
64	*/
65	DECLINLINE(int) vdiError(PVDIIMAGEDESC pImage, int rc, RT_SRC_POS_DECL,
66	const char *pszFormat, ...)
67	{
68	va_list va;
69	va_start(va, pszFormat);
70	if (pImage->pInterfaceError && pImage->pInterfaceErrorCallbacks)
71	pImage->pInterfaceErrorCallbacks->pfnError(pImage->pInterfaceError->pvUser,
72	rc, RT_SRC_POS_ARGS,
73	pszFormat, va);
74	va_end(va);
75	return rc;
76	}
77
78	/**
79	* Internal: signal an informational message to the frontend.
80	*/
81	DECLINLINE(int) vdiMessage(PVDIIMAGEDESC pImage, const char *pszFormat, ...)
82	{
83	int rc = VINF_SUCCESS;
84	va_list va;
85	va_start(va, pszFormat);
86	if (pImage->pInterfaceError && pImage->pInterfaceErrorCallbacks)
87	rc = pImage->pInterfaceErrorCallbacks->pfnMessage(pImage->pInterfaceError->pvUser,
88	pszFormat, va);
89	va_end(va);
90	return rc;
91	}
92
93
94	DECLINLINE(int) vdiFileOpen(PVDIIMAGEDESC pImage, const char *pszFilename,
95	uint32_t fOpen)
96	{
97	return pImage->pInterfaceIOCallbacks->pfnOpen(pImage->pInterfaceIO->pvUser,
98	pszFilename, fOpen,
99	&pImage->pStorage);
100	}
101
102	DECLINLINE(int) vdiFileClose(PVDIIMAGEDESC pImage)
103	{
104	return pImage->pInterfaceIOCallbacks->pfnClose(pImage->pInterfaceIO->pvUser,
105	pImage->pStorage);
106	}
107
108	DECLINLINE(int) vdiFileDelete(PVDIIMAGEDESC pImage, const char *pszFilename)
109	{
110	return pImage->pInterfaceIOCallbacks->pfnDelete(pImage->pInterfaceIO->pvUser,
111	pszFilename);
112	}
113
114	DECLINLINE(int) vdiFileMove(PVDIIMAGEDESC pImage, const char *pszSrc,
115	const char *pszDst, unsigned fMove)
116	{
117	return pImage->pInterfaceIOCallbacks->pfnMove(pImage->pInterfaceIO->pvUser,
118	pszSrc, pszDst, fMove);
119	}
120
121	DECLINLINE(int) vdiFileGetFreeSpace(PVDIIMAGEDESC pImage, const char *pszFilename,
122	int64_t *pcbFree)
123	{
124	return pImage->pInterfaceIOCallbacks->pfnGetFreeSpace(pImage->pInterfaceIO->pvUser,
125	pszFilename, pcbFree);
126	}
127
128	DECLINLINE(int) vdiFileGetSize(PVDIIMAGEDESC pImage, uint64_t *pcbSize)
129	{
130	return pImage->pInterfaceIOCallbacks->pfnGetSize(pImage->pInterfaceIO->pvUser,
131	pImage->pStorage, pcbSize);
132	}
133
134	DECLINLINE(int) vdiFileSetSize(PVDIIMAGEDESC pImage, uint64_t cbSize)
135	{
136	return pImage->pInterfaceIOCallbacks->pfnSetSize(pImage->pInterfaceIO->pvUser,
137	pImage->pStorage, cbSize);
138	}
139
140	DECLINLINE(int) vdiFileWriteSync(PVDIIMAGEDESC pImage, uint64_t uOffset,
141	const void *pvBuffer, size_t cbBuffer,
142	size_t *pcbWritten)
143	{
144	return pImage->pInterfaceIOCallbacks->pfnWriteSync(pImage->pInterfaceIO->pvUser,
145	pImage->pStorage, uOffset,
146	pvBuffer, cbBuffer, pcbWritten);
147	}
148
149	DECLINLINE(int) vdiFileReadSync(PVDIIMAGEDESC pImage, uint64_t uOffset,
150	void pvBuffer, size_t cbBuffer, size_t pcbRead)
151	{
152	return pImage->pInterfaceIOCallbacks->pfnReadSync(pImage->pInterfaceIO->pvUser,
153	pImage->pStorage, uOffset,
154	pvBuffer, cbBuffer, pcbRead);
155	}
156
157	DECLINLINE(int) vdiFileFlushSync(PVDIIMAGEDESC pImage)
158	{
159	return pImage->pInterfaceIOCallbacks->pfnFlushSync(pImage->pInterfaceIO->pvUser,
160	pImage->pStorage);
161	}
162
163	DECLINLINE(int) vdiFileReadUserAsync(PVDIIMAGEDESC pImage, uint64_t uOffset,
164	PVDIOCTX pIoCtx, size_t cbRead)
165	{
166	return pImage->pInterfaceIOCallbacks->pfnReadUserAsync(pImage->pInterfaceIO->pvUser,
167	pImage->pStorage,
168	uOffset, pIoCtx,
169	cbRead);
170	}
171
172	DECLINLINE(int) vdiFileWriteUserAsync(PVDIIMAGEDESC pImage, uint64_t uOffset,
173	PVDIOCTX pIoCtx, size_t cbWrite,
174	PFNVDXFERCOMPLETED pfnComplete,
175	void *pvCompleteUser)
176	{
177	return pImage->pInterfaceIOCallbacks->pfnWriteUserAsync(pImage->pInterfaceIO->pvUser,
178	pImage->pStorage,
179	uOffset, pIoCtx,
180	cbWrite,
181	pfnComplete,
182	pvCompleteUser);
183	}
184
185	DECLINLINE(int) vdiFileWriteMetaAsync(PVDIIMAGEDESC pImage, uint64_t uOffset,
186	void *pvBuffer, size_t cbBuffer,
187	PVDIOCTX pIoCtx,
188	PFNVDXFERCOMPLETED pfnComplete,
189	void *pvCompleteUser)
190	{
191	return pImage->pInterfaceIOCallbacks->pfnWriteMetaAsync(pImage->pInterfaceIO->pvUser,
192	pImage->pStorage,
193	uOffset, pvBuffer,
194	cbBuffer, pIoCtx,
195	pfnComplete,
196	pvCompleteUser);
197	}
198
199	DECLINLINE(int) vdiFileFlushAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx,
200	PFNVDXFERCOMPLETED pfnComplete,
201	void *pvCompleteUser)
202	{
203	return pImage->pInterfaceIOCallbacks->pfnFlushAsync(pImage->pInterfaceIO->pvUser,
204	pImage->pStorage,
205	pIoCtx, pfnComplete,
206	pvCompleteUser);
207	}
208
209	DECLINLINE(size_t) vdiFileIoCtxSet(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx,
210	int ch, size_t cbSet)
211	{
212	return pImage->pInterfaceIOCallbacks->pfnIoCtxSet(pImage->pInterfaceIO->pvUser,
213	pIoCtx, ch, cbSet);
214	}
215
216
217	/**
218	* Internal: Flush the image file to disk.
219	*/
220	static void vdiFlushImage(PVDIIMAGEDESC pImage)
221	{
222	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
223	{
224	/* Save header. */
225	int rc = vdiUpdateHeader(pImage);
226	AssertMsgRC(rc, ("vdiUpdateHeader() failed, filename=\"%s\", rc=%Rrc\n",
227	pImage->pszFilename, rc));
228	vdiFileFlushSync(pImage);
229	}
230	}
231
232	/**
233	* Internal: Free all allocated space for representing an image, and optionally
234	* delete the image from disk.
235	*/
236	static int vdiFreeImage(PVDIIMAGEDESC pImage, bool fDelete)
237	{
238	int rc = VINF_SUCCESS;
239
240	/* Freeing a never allocated image (e.g. because the open failed) is
241	* not signalled as an error. After all nothing bad happens. */
242	if (pImage)
243	{
244	if (pImage->pStorage)
245	{
246	/* No point updating the file that is deleted anyway. */
247	if (!fDelete)
248	vdiFlushImage(pImage);
249
250	vdiFileClose(pImage);
251	pImage->pStorage = NULL;
252	}
253
254	if (pImage->paBlocks)
255	{
256	RTMemFree(pImage->paBlocks);
257	pImage->paBlocks = NULL;
258	}
259
260	if (fDelete && pImage->pszFilename)
261	vdiFileDelete(pImage, pImage->pszFilename);
262	}
263
264	LogFlowFunc(("returns %Rrc\n", rc));
265	return rc;
266	}
267
268	/**
269	* internal: return power of 2 or 0 if num error.
270	*/
271	static unsigned getPowerOfTwo(unsigned uNumber)
272	{
273	if (uNumber == 0)
274	return 0;
275	unsigned uPower2 = 0;
276	while ((uNumber & 1) == 0)
277	{
278	uNumber >>= 1;
279	uPower2++;
280	}
281	return uNumber == 1 ? uPower2 : 0;
282	}
283
284	/**
285	* Internal: Init VDI preheader.
286	*/
287	static void vdiInitPreHeader(PVDIPREHEADER pPreHdr)
288	{
289	pPreHdr->u32Signature = VDI_IMAGE_SIGNATURE;
290	pPreHdr->u32Version = VDI_IMAGE_VERSION;
291	memset(pPreHdr->szFileInfo, 0, sizeof(pPreHdr->szFileInfo));
292	strncat(pPreHdr->szFileInfo, VDI_IMAGE_FILE_INFO, sizeof(pPreHdr->szFileInfo)-1);
293	}
294
295	/**
296	* Internal: check VDI preheader.
297	*/
298	static int vdiValidatePreHeader(PVDIPREHEADER pPreHdr)
299	{
300	if (pPreHdr->u32Signature != VDI_IMAGE_SIGNATURE)
301	return VERR_VD_VDI_INVALID_HEADER;
302
303	if ( VDI_GET_VERSION_MAJOR(pPreHdr->u32Version) != VDI_IMAGE_VERSION_MAJOR
304	&& pPreHdr->u32Version != 0x00000002) /* old version. */
305	return VERR_VD_VDI_UNSUPPORTED_VERSION;
306
307	return VINF_SUCCESS;
308	}
309
310	/**
311	* Internal: translate VD image flags to VDI image type enum.
312	*/
313	static VDIIMAGETYPE vdiTranslateImageFlags2VDI(unsigned uImageFlags)
314	{
315	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
316	return VDI_IMAGE_TYPE_FIXED;
317	else if (uImageFlags & VD_IMAGE_FLAGS_DIFF)
318	return VDI_IMAGE_TYPE_DIFF;
319	else
320	return VDI_IMAGE_TYPE_NORMAL;
321	}
322
323	/**
324	* Internal: translate VDI image type enum to VD image type enum.
325	*/
326	static unsigned vdiTranslateVDI2ImageFlags(VDIIMAGETYPE enmType)
327	{
328	switch (enmType)
329	{
330	case VDI_IMAGE_TYPE_NORMAL:
331	return VD_IMAGE_FLAGS_NONE;
332	case VDI_IMAGE_TYPE_FIXED:
333	return VD_IMAGE_FLAGS_FIXED;
334	case VDI_IMAGE_TYPE_DIFF:
335	return VD_IMAGE_FLAGS_DIFF;
336	default:
337	AssertMsgFailed(("invalid VDIIMAGETYPE enmType=%d\n", (int)enmType));
338	return VD_IMAGE_FLAGS_NONE;
339	}
340	}
341
342	/**
343	* Internal: Init VDI header. Always use latest header version.
344	* @param pHeader Assumes it was initially initialized to all zeros.
345	*/
346	static void vdiInitHeader(PVDIHEADER pHeader, uint32_t uImageFlags,
347	const char *pszComment, uint64_t cbDisk,
348	uint32_t cbBlock, uint32_t cbBlockExtra)
349	{
350	pHeader->uVersion = VDI_IMAGE_VERSION;
351	pHeader->u.v1plus.cbHeader = sizeof(VDIHEADER1PLUS);
352	pHeader->u.v1plus.u32Type = (uint32_t)vdiTranslateImageFlags2VDI(uImageFlags);
353	pHeader->u.v1plus.fFlags = (uImageFlags & VD_VDI_IMAGE_FLAGS_ZERO_EXPAND) ? 1 : 0;
354	#ifdef VBOX_STRICT
355	char achZero[VDI_IMAGE_COMMENT_SIZE] = {0};
356	Assert(!memcmp(pHeader->u.v1plus.szComment, achZero, VDI_IMAGE_COMMENT_SIZE));
357	#endif
358	pHeader->u.v1plus.szComment[0] = '\0';
359	if (pszComment)
360	{
361	AssertMsg(strlen(pszComment) < sizeof(pHeader->u.v1plus.szComment),
362	("HDD Comment is too long, cb=%d\n", strlen(pszComment)));
363	strncat(pHeader->u.v1plus.szComment, pszComment, sizeof(pHeader->u.v1plus.szComment)-1);
364	}
365
366	/* Mark the legacy geometry not-calculated. */
367	pHeader->u.v1plus.LegacyGeometry.cCylinders = 0;
368	pHeader->u.v1plus.LegacyGeometry.cHeads = 0;
369	pHeader->u.v1plus.LegacyGeometry.cSectors = 0;
370	pHeader->u.v1plus.LegacyGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
371	pHeader->u.v1plus.u32Dummy = 0; /* used to be the translation value */
372
373	pHeader->u.v1plus.cbDisk = cbDisk;
374	pHeader->u.v1plus.cbBlock = cbBlock;
375	pHeader->u.v1plus.cBlocks = (uint32_t)(cbDisk / cbBlock);
376	if (cbDisk % cbBlock)
377	pHeader->u.v1plus.cBlocks++;
378	pHeader->u.v1plus.cbBlockExtra = cbBlockExtra;
379	pHeader->u.v1plus.cBlocksAllocated = 0;
380
381	/* Init offsets. */
382	pHeader->u.v1plus.offBlocks = RT_ALIGN_32(sizeof(VDIPREHEADER) + sizeof(VDIHEADER1PLUS), VDI_DATA_ALIGN);
383	pHeader->u.v1plus.offData = RT_ALIGN_32(pHeader->u.v1plus.offBlocks + (pHeader->u.v1plus.cBlocks * sizeof(VDIIMAGEBLOCKPOINTER)), VDI_DATA_ALIGN);
384
385	/* Init uuids. */
386	RTUuidCreate(&pHeader->u.v1plus.uuidCreate);
387	RTUuidClear(&pHeader->u.v1plus.uuidModify);
388	RTUuidClear(&pHeader->u.v1plus.uuidLinkage);
389	RTUuidClear(&pHeader->u.v1plus.uuidParentModify);
390
391	/* Mark LCHS geometry not-calculated. */
392	pHeader->u.v1plus.LCHSGeometry.cCylinders = 0;
393	pHeader->u.v1plus.LCHSGeometry.cHeads = 0;
394	pHeader->u.v1plus.LCHSGeometry.cSectors = 0;
395	pHeader->u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
396	}
397
398	/**
399	* Internal: Check VDI header.
400	*/
401	static int vdiValidateHeader(PVDIHEADER pHeader)
402	{
403	/* Check version-dependent header parameters. */
404	switch (GET_MAJOR_HEADER_VERSION(pHeader))
405	{
406	case 0:
407	{
408	/* Old header version. */
409	break;
410	}
411	case 1:
412	{
413	/* Current header version. */
414
415	if (pHeader->u.v1.cbHeader < sizeof(VDIHEADER1))
416	{
417	LogRel(("VDI: v1 header size wrong (%d < %d)\n",
418	pHeader->u.v1.cbHeader, sizeof(VDIHEADER1)));
419	return VERR_VD_VDI_INVALID_HEADER;
420	}
421
422	if (getImageBlocksOffset(pHeader) < (sizeof(VDIPREHEADER) + sizeof(VDIHEADER1)))
423	{
424	LogRel(("VDI: v1 blocks offset wrong (%d < %d)\n",
425	getImageBlocksOffset(pHeader), sizeof(VDIPREHEADER) + sizeof(VDIHEADER1)));
426	return VERR_VD_VDI_INVALID_HEADER;
427	}
428
429	if (getImageDataOffset(pHeader) < (getImageBlocksOffset(pHeader) + getImageBlocks(pHeader) * sizeof(VDIIMAGEBLOCKPOINTER)))
430	{
431	LogRel(("VDI: v1 image data offset wrong (%d < %d)\n",
432	getImageDataOffset(pHeader), getImageBlocksOffset(pHeader) + getImageBlocks(pHeader) * sizeof(VDIIMAGEBLOCKPOINTER)));
433	return VERR_VD_VDI_INVALID_HEADER;
434	}
435
436	break;
437	}
438	default:
439	/* Unsupported. */
440	return VERR_VD_VDI_UNSUPPORTED_VERSION;
441	}
442
443	/* Check common header parameters. */
444
445	bool fFailed = false;
446
447	if ( getImageType(pHeader) < VDI_IMAGE_TYPE_FIRST
448	\|\| getImageType(pHeader) > VDI_IMAGE_TYPE_LAST)
449	{
450	LogRel(("VDI: bad image type %d\n", getImageType(pHeader)));
451	fFailed = true;
452	}
453
454	if (getImageFlags(pHeader) & ~VD_VDI_IMAGE_FLAGS_MASK)
455	{
456	LogRel(("VDI: bad image flags %08x\n", getImageFlags(pHeader)));
457	fFailed = true;
458	}
459
460	if ( getImageLCHSGeometry(pHeader)
461	&& (getImageLCHSGeometry(pHeader))->cbSector != VDI_GEOMETRY_SECTOR_SIZE)
462	{
463	LogRel(("VDI: wrong sector size (%d != %d)\n",
464	(getImageLCHSGeometry(pHeader))->cbSector, VDI_GEOMETRY_SECTOR_SIZE));
465	fFailed = true;
466	}
467
468	if ( getImageDiskSize(pHeader) == 0
469	\|\| getImageBlockSize(pHeader) == 0
470	\|\| getImageBlocks(pHeader) == 0
471	\|\| getPowerOfTwo(getImageBlockSize(pHeader)) == 0)
472	{
473	LogRel(("VDI: wrong size (%lld, %d, %d, %d)\n",
474	getImageDiskSize(pHeader), getImageBlockSize(pHeader),
475	getImageBlocks(pHeader), getPowerOfTwo(getImageBlockSize(pHeader))));
476	fFailed = true;
477	}
478
479	if (getImageBlocksAllocated(pHeader) > getImageBlocks(pHeader))
480	{
481	LogRel(("VDI: too many blocks allocated (%d > %d)\n"
482	" blocksize=%d disksize=%lld\n",
483	getImageBlocksAllocated(pHeader), getImageBlocks(pHeader),
484	getImageBlockSize(pHeader), getImageDiskSize(pHeader)));
485	fFailed = true;
486	}
487
488	if ( getImageExtraBlockSize(pHeader) != 0
489	&& getPowerOfTwo(getImageExtraBlockSize(pHeader)) == 0)
490	{
491	LogRel(("VDI: wrong extra size (%d, %d)\n",
492	getImageExtraBlockSize(pHeader), getPowerOfTwo(getImageExtraBlockSize(pHeader))));
493	fFailed = true;
494	}
495
496	if ((uint64_t)getImageBlockSize(pHeader) * getImageBlocks(pHeader) < getImageDiskSize(pHeader))
497	{
498	LogRel(("VDI: wrong disk size (%d, %d, %lld)\n",
499	getImageBlockSize(pHeader), getImageBlocks(pHeader), getImageDiskSize(pHeader)));
500	fFailed = true;
501	}
502
503	if (RTUuidIsNull(getImageCreationUUID(pHeader)))
504	{
505	LogRel(("VDI: uuid of creator is 0\n"));
506	fFailed = true;
507	}
508
509	if (RTUuidIsNull(getImageModificationUUID(pHeader)))
510	{
511	LogRel(("VDI: uuid of modifier is 0\n"));
512	fFailed = true;
513	}
514
515	return fFailed ? VERR_VD_VDI_INVALID_HEADER : VINF_SUCCESS;
516	}
517
518	/**
519	* Internal: Set up VDIIMAGEDESC structure by image header.
520	*/
521	static void vdiSetupImageDesc(PVDIIMAGEDESC pImage)
522	{
523	pImage->uImageFlags = getImageFlags(&pImage->Header);
524	pImage->uImageFlags \|= vdiTranslateVDI2ImageFlags(getImageType(&pImage->Header));
525	pImage->offStartBlocks = getImageBlocksOffset(&pImage->Header);
526	pImage->offStartData = getImageDataOffset(&pImage->Header);
527	pImage->uBlockMask = getImageBlockSize(&pImage->Header) - 1;
528	pImage->uShiftOffset2Index = getPowerOfTwo(getImageBlockSize(&pImage->Header));
529	pImage->offStartBlockData = getImageExtraBlockSize(&pImage->Header);
530	pImage->cbTotalBlockData = pImage->offStartBlockData
531	+ getImageBlockSize(&pImage->Header);
532	}
533
534	/**
535	* Internal: Create VDI image file.
536	*/
537	static int vdiCreateImage(PVDIIMAGEDESC pImage, uint64_t cbSize,
538	unsigned uImageFlags, const char *pszComment,
539	PCVDGEOMETRY pPCHSGeometry,
540	PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
541	unsigned uOpenFlags, PFNVDPROGRESS pfnProgress,
542	void *pvUser, unsigned uPercentStart,
543	unsigned uPercentSpan)
544	{
545	int rc;
546	uint64_t cbTotal;
547	uint64_t cbFill;
548	uint64_t uOff;
549
550	/* Special check for comment length. */
551	if ( VALID_PTR(pszComment)
552	&& strlen(pszComment) >= VDI_IMAGE_COMMENT_SIZE)
553	{
554	rc = vdiError(pImage, VERR_VD_VDI_COMMENT_TOO_LONG, RT_SRC_POS, N_("VDI: comment is too long for '%s'"), pImage->pszFilename);
555	goto out;
556	}
557	AssertPtr(pPCHSGeometry);
558	AssertPtr(pLCHSGeometry);
559
560	pImage->pInterfaceError = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_ERROR);
561	if (pImage->pInterfaceError)
562	pImage->pInterfaceErrorCallbacks = VDGetInterfaceError(pImage->pInterfaceError);
563
564	/* Get I/O interface. */
565	pImage->pInterfaceIO = VDInterfaceGet(pImage->pVDIfsImage, VDINTERFACETYPE_IOINT);
566	AssertPtrReturn(pImage->pInterfaceIO, VERR_INVALID_PARAMETER);
567	pImage->pInterfaceIOCallbacks = VDGetInterfaceIOInt(pImage->pInterfaceIO);
568	AssertPtrReturn(pImage->pInterfaceIOCallbacks, VERR_INVALID_PARAMETER);
569
570	vdiInitPreHeader(&pImage->PreHeader);
571	vdiInitHeader(&pImage->Header, uImageFlags, pszComment, cbSize, VDI_IMAGE_DEFAULT_BLOCK_SIZE, 0);
572	/* Save PCHS geometry. Not much work, and makes the flow of information
573	* quite a bit clearer - relying on the higher level isn't obvious. */
574	pImage->PCHSGeometry = *pPCHSGeometry;
575	/* Set LCHS geometry (legacy geometry is ignored for the current 1.1+). */
576	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = pLCHSGeometry->cCylinders;
577	pImage->Header.u.v1plus.LCHSGeometry.cHeads = pLCHSGeometry->cHeads;
578	pImage->Header.u.v1plus.LCHSGeometry.cSectors = pLCHSGeometry->cSectors;
579	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
580
581	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
582	if (!pImage->paBlocks)
583	{
584	rc = VERR_NO_MEMORY;
585	goto out;
586	}
587
588	if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
589	{
590	/* for growing images mark all blocks in paBlocks as free. */
591	for (unsigned i = 0; i < pImage->Header.u.v1.cBlocks; i++)
592	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
593	}
594	else
595	{
596	/* for fixed images mark all blocks in paBlocks as allocated */
597	for (unsigned i = 0; i < pImage->Header.u.v1.cBlocks; i++)
598	pImage->paBlocks[i] = i;
599	pImage->Header.u.v1.cBlocksAllocated = pImage->Header.u.v1.cBlocks;
600	}
601
602	/* Setup image parameters. */
603	vdiSetupImageDesc(pImage);
604
605	/* Create image file. */
606	rc = vdiFileOpen(pImage, pImage->pszFilename,
607	VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY,
608	true /* fCreate */));
609	if (RT_FAILURE(rc))
610	{
611	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: cannot create image '%s'"), pImage->pszFilename);
612	goto out;
613	}
614
615	cbTotal = pImage->offStartData
616	+ (uint64_t)getImageBlocks(&pImage->Header) * pImage->cbTotalBlockData;
617
618	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
619	{
620	/* Check the free space on the disk and leave early if there is not
621	* sufficient space available. */
622	int64_t cbFree = 0;
623	rc = vdiFileGetFreeSpace(pImage, pImage->pszFilename, &cbFree);
624	if (RT_SUCCESS(rc) /* ignore errors */ && ((uint64_t)cbFree < cbTotal))
625	{
626	rc = vdiError(pImage, VERR_DISK_FULL, RT_SRC_POS, N_("VDI: disk would overflow creating image '%s'"), pImage->pszFilename);
627	goto out;
628	}
629	}
630
631	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
632	{
633	/*
634	* Allocate & commit whole file if fixed image, it must be more
635	* effective than expanding file by write operations.
636	*/
637	rc = vdiFileSetSize(pImage, cbTotal);
638	}
639	else
640	{
641	/* Set file size to hold header and blocks array. */
642	rc = vdiFileSetSize(pImage, pImage->offStartData);
643	}
644	if (RT_FAILURE(rc))
645	{
646	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: setting image size failed for '%s'"), pImage->pszFilename);
647	goto out;
648	}
649
650	/* Use specified image uuid */
651	getImageCreationUUID(&pImage->Header) = pUuid;
652
653	/* Generate image last-modify uuid */
654	RTUuidCreate(getImageModificationUUID(&pImage->Header));
655
656	/* Write pre-header. */
657	rc = vdiFileWriteSync(pImage, 0, &pImage->PreHeader, sizeof(pImage->PreHeader), NULL);
658	if (RT_FAILURE(rc))
659	{
660	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing pre-header failed for '%s'"), pImage->pszFilename);
661	goto out;
662	}
663
664	/* Write header. */
665	rc = vdiFileWriteSync(pImage, sizeof(pImage->PreHeader),
666	&pImage->Header.u.v1plus,
667	sizeof(pImage->Header.u.v1plus), NULL);
668	if (RT_FAILURE(rc))
669	{
670	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing header failed for '%s'"), pImage->pszFilename);
671	goto out;
672	}
673
674	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
675	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
676	NULL);
677	if (RT_FAILURE(rc))
678	{
679	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing block pointers failed for '%s'"), pImage->pszFilename);
680	goto out;
681	}
682
683	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
684	{
685	/* Fill image with zeroes. We do this for every fixed-size image since on some systems
686	* (for example Windows Vista), it takes ages to write a block near the end of a sparse
687	* file and the guest could complain about an ATA timeout. */
688
689	/** @todo Starting with Linux 2.6.23, there is an fallocate() system call.
690	* Currently supported file systems are ext4 and ocfs2. */
691
692	/* Allocate a temporary zero-filled buffer. Use a bigger block size to optimize writing */
693	const size_t cbBuf = 128 * _1K;
694	void *pvBuf = RTMemTmpAllocZ(cbBuf);
695	if (!pvBuf)
696	{
697	rc = VERR_NO_MEMORY;
698	goto out;
699	}
700
701	cbFill = (uint64_t)getImageBlocks(&pImage->Header) * pImage->cbTotalBlockData;
702	uOff = 0;
703	/* Write data to all image blocks. */
704	while (uOff < cbFill)
705	{
706	unsigned cbChunk = (unsigned)RT_MIN(cbFill, cbBuf);
707
708	rc = vdiFileWriteSync(pImage, pImage->offStartData + uOff,
709	pvBuf, cbChunk, NULL);
710	if (RT_FAILURE(rc))
711	{
712	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: writing block failed for '%s'"), pImage->pszFilename);
713	RTMemTmpFree(pvBuf);
714	goto out;
715	}
716
717	uOff += cbChunk;
718
719	if (pfnProgress)
720	{
721	rc = pfnProgress(pvUser,
722	uPercentStart + uOff * uPercentSpan / cbFill);
723	if (RT_FAILURE(rc))
724	goto out;
725	}
726	}
727	RTMemTmpFree(pvBuf);
728	}
729
730	out:
731	if (RT_SUCCESS(rc) && pfnProgress)
732	pfnProgress(pvUser, uPercentStart + uPercentSpan);
733
734	if (RT_FAILURE(rc))
735	vdiFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
736	return rc;
737	}
738
739	/**
740	* Internal: Open a VDI image.
741	*/
742	static int vdiOpenImage(PVDIIMAGEDESC pImage, unsigned uOpenFlags)
743	{
744	int rc;
745
746	pImage->uOpenFlags = uOpenFlags;
747
748	pImage->pInterfaceError = VDInterfaceGet(pImage->pVDIfsDisk, VDINTERFACETYPE_ERROR);
749	if (pImage->pInterfaceError)
750	pImage->pInterfaceErrorCallbacks = VDGetInterfaceError(pImage->pInterfaceError);
751
752	/* Get I/O interface. */
753	pImage->pInterfaceIO = VDInterfaceGet(pImage->pVDIfsImage, VDINTERFACETYPE_IOINT);
754	AssertPtrReturn(pImage->pInterfaceIO, VERR_INVALID_PARAMETER);
755	pImage->pInterfaceIOCallbacks = VDGetInterfaceIOInt(pImage->pInterfaceIO);
756	AssertPtrReturn(pImage->pInterfaceIOCallbacks, VERR_INVALID_PARAMETER);
757
758	/*
759	* Open the image.
760	*/
761	rc = vdiFileOpen(pImage, pImage->pszFilename,
762	VDOpenFlagsToFileOpenFlags(uOpenFlags, false /* fCreate */));
763	if (RT_FAILURE(rc))
764	{
765	/* Do NOT signal an appropriate error here, as the VD layer has the
766	* choice of retrying the open if it failed. */
767	goto out;
768	}
769
770	/* Read pre-header. */
771	rc = vdiFileReadSync(pImage, 0, &pImage->PreHeader, sizeof(pImage->PreHeader), NULL);
772	if (RT_FAILURE(rc))
773	{
774	vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading pre-header in '%s'"), pImage->pszFilename);
775	rc = VERR_VD_VDI_INVALID_HEADER;
776	goto out;
777	}
778	rc = vdiValidatePreHeader(&pImage->PreHeader);
779	if (RT_FAILURE(rc))
780	{
781	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: invalid pre-header in '%s'"), pImage->pszFilename);
782	goto out;
783	}
784
785	/* Read header. */
786	pImage->Header.uVersion = pImage->PreHeader.u32Version;
787	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
788	{
789	case 0:
790	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
791	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
792	NULL);
793	if (RT_FAILURE(rc))
794	{
795	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v0 header in '%s'"), pImage->pszFilename);
796	goto out;
797	}
798	break;
799	case 1:
800	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
801	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
802	NULL);
803	if (RT_FAILURE(rc))
804	{
805	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1 header in '%s'"), pImage->pszFilename);
806	goto out;
807	}
808	/* Convert VDI 1.1 images to VDI 1.1+ on open in read/write mode.
809	* Conversion is harmless, as any VirtualBox version supporting VDI
810	* 1.1 doesn't touch fields it doesn't know about. */
811	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
812	&& GET_MINOR_HEADER_VERSION(&pImage->Header) == 1
813	&& pImage->Header.u.v1.cbHeader < sizeof(pImage->Header.u.v1plus))
814	{
815	pImage->Header.u.v1plus.cbHeader = sizeof(pImage->Header.u.v1plus);
816	/* Mark LCHS geometry not-calculated. */
817	pImage->Header.u.v1plus.LCHSGeometry.cCylinders = 0;
818	pImage->Header.u.v1plus.LCHSGeometry.cHeads = 0;
819	pImage->Header.u.v1plus.LCHSGeometry.cSectors = 0;
820	pImage->Header.u.v1plus.LCHSGeometry.cbSector = VDI_GEOMETRY_SECTOR_SIZE;
821	}
822	else if (pImage->Header.u.v1.cbHeader >= sizeof(pImage->Header.u.v1plus))
823	{
824	/* Read the actual VDI 1.1+ header completely. */
825	rc = vdiFileReadSync(pImage, sizeof(pImage->PreHeader),
826	&pImage->Header.u.v1plus,
827	sizeof(pImage->Header.u.v1plus), NULL);
828	if (RT_FAILURE(rc))
829	{
830	rc = vdiError(pImage, rc, RT_SRC_POS, N_("VDI: error reading v1.1+ header in '%s'"), pImage->pszFilename);
831	goto out;
832	}
833	}
834	break;
835	default:
836	rc = vdiError(pImage, VERR_VD_VDI_UNSUPPORTED_VERSION, RT_SRC_POS, N_("VDI: unsupported major version %u in '%s'"), GET_MAJOR_HEADER_VERSION(&pImage->Header), pImage->pszFilename);
837	goto out;
838	}
839
840	rc = vdiValidateHeader(&pImage->Header);
841	if (RT_FAILURE(rc))
842	{
843	rc = vdiError(pImage, VERR_VD_VDI_INVALID_HEADER, RT_SRC_POS, N_("VDI: invalid header in '%s'"), pImage->pszFilename);
844	goto out;
845	}
846
847	/* Setup image parameters by header. */
848	vdiSetupImageDesc(pImage);
849
850	/* Allocate memory for blocks array. */
851	pImage->paBlocks = (PVDIIMAGEBLOCKPOINTER)RTMemAlloc(sizeof(VDIIMAGEBLOCKPOINTER) * getImageBlocks(&pImage->Header));
852	if (!pImage->paBlocks)
853	{
854	rc = VERR_NO_MEMORY;
855	goto out;
856	}
857
858	/* Read blocks array. */
859	rc = vdiFileReadSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
860	getImageBlocks(&pImage->Header) * sizeof(VDIIMAGEBLOCKPOINTER),
861	NULL);
862
863	out:
864	if (RT_FAILURE(rc))
865	vdiFreeImage(pImage, false);
866	return rc;
867	}
868
869	/**
870	* Internal: Save header to file.
871	*/
872	static int vdiUpdateHeader(PVDIIMAGEDESC pImage)
873	{
874	int rc;
875	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
876	{
877	case 0:
878	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
879	&pImage->Header.u.v0, sizeof(pImage->Header.u.v0),
880	NULL);
881	break;
882	case 1:
883	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
884	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
885	&pImage->Header.u.v1, sizeof(pImage->Header.u.v1),
886	NULL);
887	else
888	rc = vdiFileWriteSync(pImage, sizeof(VDIPREHEADER),
889	&pImage->Header.u.v1plus, sizeof(pImage->Header.u.v1plus),
890	NULL);
891	break;
892	default:
893	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
894	break;
895	}
896	AssertMsgRC(rc, ("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
897	return rc;
898	}
899
900	/**
901	* Internal: Save header to file - async version.
902	*/
903	static int vdiUpdateHeaderAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
904	{
905	int rc;
906	switch (GET_MAJOR_HEADER_VERSION(&pImage->Header))
907	{
908	case 0:
909	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
910	&pImage->Header.u.v0,
911	sizeof(pImage->Header.u.v0),
912	pIoCtx, NULL, NULL);
913	break;
914	case 1:
915	if (pImage->Header.u.v1plus.cbHeader < sizeof(pImage->Header.u.v1plus))
916	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
917	&pImage->Header.u.v1,
918	sizeof(pImage->Header.u.v1),
919	pIoCtx, NULL, NULL);
920	else
921	rc = vdiFileWriteMetaAsync(pImage, sizeof(VDIPREHEADER),
922	&pImage->Header.u.v1plus,
923	sizeof(pImage->Header.u.v1plus),
924	pIoCtx, NULL, NULL);
925	break;
926	default:
927	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
928	break;
929	}
930	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
931	("vdiUpdateHeader failed, filename=\"%s\" rc=%Rrc\n", pImage->pszFilename, rc));
932	return rc;
933	}
934
935	/**
936	* Internal: Save block pointer to file, save header to file.
937	*/
938	static int vdiUpdateBlockInfo(PVDIIMAGEDESC pImage, unsigned uBlock)
939	{
940	/* Update image header. */
941	int rc = vdiUpdateHeader(pImage);
942	if (RT_SUCCESS(rc))
943	{
944	/* write only one block pointer. */
945	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
946	&pImage->paBlocks[uBlock], sizeof(VDIIMAGEBLOCKPOINTER),
947	NULL);
948	AssertMsgRC(rc, ("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
949	uBlock, pImage->pszFilename, rc));
950	}
951	return rc;
952	}
953
954	/**
955	* Internal: Save block pointer to file, save header to file - async version.
956	*/
957	static int vdiUpdateBlockInfoAsync(PVDIIMAGEDESC pImage, unsigned uBlock,
958	PVDIOCTX pIoCtx)
959	{
960	/* Update image header. */
961	int rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
962	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
963	{
964	/* write only one block pointer. */
965	rc = vdiFileWriteMetaAsync(pImage,
966	pImage->offStartBlocks + uBlock * sizeof(VDIIMAGEBLOCKPOINTER),
967	&pImage->paBlocks[uBlock],
968	sizeof(VDIIMAGEBLOCKPOINTER),
969	pIoCtx, NULL, NULL);
970	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
971	("vdiUpdateBlockInfo failed to update block=%u, filename=\"%s\", rc=%Rrc\n",
972	uBlock, pImage->pszFilename, rc));
973	}
974	return rc;
975	}
976
977	/**
978	* Internal: Flush the image file to disk - async version.
979	*/
980	static int vdiFlushImageAsync(PVDIIMAGEDESC pImage, PVDIOCTX pIoCtx)
981	{
982	int rc = VINF_SUCCESS;
983
984	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
985	{
986	/* Save header. */
987	rc = vdiUpdateHeaderAsync(pImage, pIoCtx);
988	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
989	("vdiUpdateHeaderAsync() failed, filename=\"%s\", rc=%Rrc\n",
990	pImage->pszFilename, rc));
991	rc = vdiFileFlushAsync(pImage, pIoCtx, NULL, NULL);
992	AssertMsg(RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS,
993	("Flushing data to disk failed rc=%Rrc\n", rc));
994	}
995
996	return rc;
997	}
998
999
1000	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
1001	static int vdiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1002	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
1003	{
1004	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
1005	int rc = VINF_SUCCESS;
1006	PVDIIMAGEDESC pImage;
1007
1008	if ( !VALID_PTR(pszFilename)
1009	\|\| !*pszFilename)
1010	{
1011	rc = VERR_INVALID_PARAMETER;
1012	goto out;
1013	}
1014
1015	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1016	if (!pImage)
1017	{
1018	rc = VERR_NO_MEMORY;
1019	goto out;
1020	}
1021	pImage->pszFilename = pszFilename;
1022	pImage->pStorage = NULL;
1023	pImage->paBlocks = NULL;
1024	pImage->pVDIfsDisk = pVDIfsDisk;
1025	pImage->pVDIfsImage = pVDIfsImage;
1026
1027	rc = vdiOpenImage(pImage, VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_READONLY);
1028	vdiFreeImage(pImage, false);
1029	RTMemFree(pImage);
1030
1031	if (RT_SUCCESS(rc))
1032	*penmType = VDTYPE_HDD;
1033
1034	out:
1035	LogFlowFunc(("returns %Rrc\n", rc));
1036	return rc;
1037	}
1038
1039	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1040	static int vdiOpen(const char *pszFilename, unsigned uOpenFlags,
1041	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1042	VDTYPE enmType, void **ppBackendData)
1043	{
1044	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
1045	int rc;
1046	PVDIIMAGEDESC pImage;
1047
1048	/* Check open flags. All valid flags are supported. */
1049	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1050	{
1051	rc = VERR_INVALID_PARAMETER;
1052	goto out;
1053	}
1054
1055	/* Check remaining arguments. */
1056	if ( !VALID_PTR(pszFilename)
1057	\|\| !*pszFilename)
1058	{
1059	rc = VERR_INVALID_PARAMETER;
1060	goto out;
1061	}
1062
1063	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1064	if (!pImage)
1065	{
1066	rc = VERR_NO_MEMORY;
1067	goto out;
1068	}
1069	pImage->pszFilename = pszFilename;
1070	pImage->pStorage = NULL;
1071	pImage->paBlocks = NULL;
1072	pImage->pVDIfsDisk = pVDIfsDisk;
1073	pImage->pVDIfsImage = pVDIfsImage;
1074
1075	rc = vdiOpenImage(pImage, uOpenFlags);
1076	if (RT_SUCCESS(rc))
1077	*ppBackendData = pImage;
1078
1079	out:
1080	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1081	return rc;
1082	}
1083
1084	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1085	static int vdiCreate(const char *pszFilename, uint64_t cbSize,
1086	unsigned uImageFlags, const char *pszComment,
1087	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1088	PCRTUUID pUuid, unsigned uOpenFlags,
1089	unsigned uPercentStart, unsigned uPercentSpan,
1090	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1091	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
1092	{
1093	LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p ppBackendData=%#p", pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
1094	int rc;
1095	PVDIIMAGEDESC pImage;
1096
1097	PFNVDPROGRESS pfnProgress = NULL;
1098	void *pvUser = NULL;
1099	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
1100	VDINTERFACETYPE_PROGRESS);
1101	PVDINTERFACEPROGRESS pCbProgress = NULL;
1102	if (pIfProgress)
1103	{
1104	pCbProgress = VDGetInterfaceProgress(pIfProgress);
1105	if (pCbProgress)
1106	pfnProgress = pCbProgress->pfnProgress;
1107	pvUser = pIfProgress->pvUser;
1108	}
1109
1110	/* Check the image flags. */
1111	if ((uImageFlags & ~VD_VDI_IMAGE_FLAGS_MASK) != 0)
1112	{
1113	rc = VERR_VD_INVALID_TYPE;
1114	goto out;
1115	}
1116
1117	/* Check open flags. All valid flags are supported. */
1118	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1119	{
1120	rc = VERR_INVALID_PARAMETER;
1121	goto out;
1122	}
1123
1124	/* Check size. Maximum 4PB-3M. No tricks with adjusting the 1M block size
1125	* so far, which would extend the size. */
1126	cbSize = RT_ALIGN_64(cbSize, _1M);
1127	if ( !cbSize
1128	\|\| cbSize >= _1P * 4 - _1M * 3)
1129	{
1130	rc = VERR_VD_INVALID_SIZE;
1131	goto out;
1132	}
1133
1134	/* Check remaining arguments. */
1135	if ( !VALID_PTR(pszFilename)
1136	\|\| !*pszFilename
1137	\|\| cbSize < VDI_IMAGE_DEFAULT_BLOCK_SIZE
1138	\|\| !VALID_PTR(pPCHSGeometry)
1139	\|\| !VALID_PTR(pLCHSGeometry))
1140	{
1141	rc = VERR_INVALID_PARAMETER;
1142	goto out;
1143	}
1144
1145	pImage = (PVDIIMAGEDESC)RTMemAllocZ(sizeof(VDIIMAGEDESC));
1146	if (!pImage)
1147	{
1148	rc = VERR_NO_MEMORY;
1149	goto out;
1150	}
1151	pImage->pszFilename = pszFilename;
1152	pImage->pStorage = NULL;
1153	pImage->paBlocks = NULL;
1154	pImage->pVDIfsDisk = pVDIfsDisk;
1155	pImage->pVDIfsImage = pVDIfsImage;
1156
1157	rc = vdiCreateImage(pImage, cbSize, uImageFlags, pszComment,
1158	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1159	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1160	if (RT_SUCCESS(rc))
1161	{
1162	/* So far the image is opened in read/write mode. Make sure the
1163	* image is opened in read-only mode if the caller requested that. */
1164	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1165	{
1166	vdiFreeImage(pImage, false);
1167	rc = vdiOpenImage(pImage, uOpenFlags);
1168	if (RT_FAILURE(rc))
1169	{
1170	RTMemFree(pImage);
1171	goto out;
1172	}
1173	}
1174	*ppBackendData = pImage;
1175	}
1176	else
1177	RTMemFree(pImage);
1178
1179	out:
1180	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1181	return rc;
1182	}
1183
1184	/** @copydoc VBOXHDDBACKEND::pfnRename */
1185	static int vdiRename(void pBackendData, const char pszFilename)
1186	{
1187	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1188
1189	int rc = VINF_SUCCESS;
1190	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1191
1192	/* Check arguments. */
1193	if ( !pImage
1194	\|\| !pszFilename
1195	\|\| !*pszFilename)
1196	{
1197	rc = VERR_INVALID_PARAMETER;
1198	goto out;
1199	}
1200
1201	/* Close the image. */
1202	vdiFreeImage(pImage, false);
1203
1204	/* Rename the file. */
1205	rc = vdiFileMove(pImage, pImage->pszFilename, pszFilename, 0);
1206	if (RT_FAILURE(rc))
1207	{
1208	/* The move failed, try to reopen the original image. */
1209	int rc2 = vdiOpenImage(pImage, pImage->uOpenFlags);
1210	if (RT_FAILURE(rc2))
1211	rc = rc2;
1212
1213	goto out;
1214	}
1215
1216	/* Update pImage with the new information. */
1217	pImage->pszFilename = pszFilename;
1218
1219	/* Open the new image. */
1220	rc = vdiOpenImage(pImage, pImage->uOpenFlags);
1221	if (RT_FAILURE(rc))
1222	goto out;
1223
1224	out:
1225	LogFlowFunc(("returns %Rrc\n", rc));
1226	return rc;
1227	}
1228
1229	/** @copydoc VBOXHDDBACKEND::pfnClose */
1230	static int vdiClose(void *pBackendData, bool fDelete)
1231	{
1232	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1233	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1234	int rc;
1235
1236	rc = vdiFreeImage(pImage, fDelete);
1237	RTMemFree(pImage);
1238
1239	LogFlowFunc(("returns %Rrc\n", rc));
1240	return rc;
1241	}
1242
1243	/** @copydoc VBOXHDDBACKEND::pfnRead */
1244	static int vdiRead(void pBackendData, uint64_t uOffset, void pvBuf,
1245	size_t cbToRead, size_t *pcbActuallyRead)
1246	{
1247	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
1248	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1249	unsigned uBlock;
1250	unsigned offRead;
1251	int rc;
1252
1253	AssertPtr(pImage);
1254	Assert(!(uOffset % 512));
1255	Assert(!(cbToRead % 512));
1256
1257	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
1258	\|\| !VALID_PTR(pvBuf)
1259	\|\| !cbToRead)
1260	{
1261	rc = VERR_INVALID_PARAMETER;
1262	goto out;
1263	}
1264
1265	/* Calculate starting block number and offset inside it. */
1266	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1267	offRead = (unsigned)uOffset & pImage->uBlockMask;
1268
1269	/* Clip read range to at most the rest of the block. */
1270	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
1271	Assert(!(cbToRead % 512));
1272
1273	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
1274	rc = VERR_VD_BLOCK_FREE;
1275	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
1276	{
1277	memset(pvBuf, 0, cbToRead);
1278	rc = VINF_SUCCESS;
1279	}
1280	else
1281	{
1282	/* Block present in image file, read relevant data. */
1283	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1284	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
1285	rc = vdiFileReadSync(pImage, u64Offset, pvBuf, cbToRead, NULL);
1286	}
1287
1288	if (pcbActuallyRead)
1289	*pcbActuallyRead = cbToRead;
1290
1291	out:
1292	LogFlowFunc(("returns %Rrc\n", rc));
1293	return rc;
1294	}
1295
1296	/*@copydoc VBOXHDDBACKEND::pfnWrite /
1297	static int vdiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
1298	size_t cbToWrite, size_t *pcbWriteProcess,
1299	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
1300	{
1301	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1302	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1303	unsigned uBlock;
1304	unsigned offWrite;
1305	int rc = VINF_SUCCESS;
1306
1307	AssertPtr(pImage);
1308	Assert(!(uOffset % 512));
1309	Assert(!(cbToWrite % 512));
1310
1311	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1312	{
1313	rc = VERR_VD_IMAGE_READ_ONLY;
1314	goto out;
1315	}
1316
1317	if (!VALID_PTR(pvBuf) \|\| !cbToWrite)
1318	{
1319	rc = VERR_INVALID_PARAMETER;
1320	goto out;
1321	}
1322
1323	/* No size check here, will do that later. For dynamic images which are
1324	* not multiples of the block size in length, this would prevent writing to
1325	* the last block. */
1326
1327	/* Calculate starting block number and offset inside it. */
1328	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
1329	offWrite = (unsigned)uOffset & pImage->uBlockMask;
1330
1331	/* Clip write range to at most the rest of the block. */
1332	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
1333	Assert(!(cbToWrite % 512));
1334
1335	do
1336	{
1337	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
1338	{
1339	/* Block is either free or zero. */
1340	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
1341	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
1342	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
1343	{
1344	/* If the destination block is unallocated at this point, it's
1345	* either a zero block or a block which hasn't been used so far
1346	* (which also means that it's a zero block. Don't need to write
1347	* anything to this block if the data consists of just zeroes. */
1348	Assert(!(cbToWrite % 4));
1349	Assert(cbToWrite * 8 <= UINT32_MAX);
1350	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
1351	{
1352	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
1353	break;
1354	}
1355	}
1356
1357	if (cbToWrite == getImageBlockSize(&pImage->Header))
1358	{
1359	/* Full block write to previously unallocated block.
1360	* Allocate block and write data. */
1361	Assert(!offWrite);
1362	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
1363	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
1364	+ (pImage->offStartData + pImage->offStartBlockData);
1365	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1366	if (RT_FAILURE(rc))
1367	goto out;
1368	pImage->paBlocks[uBlock] = cBlocksAllocated;
1369	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
1370
1371	rc = vdiUpdateBlockInfo(pImage, uBlock);
1372	if (RT_FAILURE(rc))
1373	goto out;
1374
1375	*pcbPreRead = 0;
1376	*pcbPostRead = 0;
1377	}
1378	else
1379	{
1380	/* Trying to do a partial write to an unallocated block. Don't do
1381	* anything except letting the upper layer know what to do. */
1382	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
1383	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
1384	rc = VERR_VD_BLOCK_FREE;
1385	}
1386	}
1387	else
1388	{
1389	/* Block present in image file, write relevant data. */
1390	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
1391	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
1392	rc = vdiFileWriteSync(pImage, u64Offset, pvBuf, cbToWrite, NULL);
1393	}
1394	} while (0);
1395
1396	if (pcbWriteProcess)
1397	*pcbWriteProcess = cbToWrite;
1398
1399	out:
1400	LogFlowFunc(("returns %Rrc\n", rc));
1401	return rc;
1402	}
1403
1404	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1405	static int vdiFlush(void *pBackendData)
1406	{
1407	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1408	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1409	int rc = VINF_SUCCESS;
1410
1411	Assert(pImage);
1412
1413	vdiFlushImage(pImage);
1414	LogFlowFunc(("returns %Rrc\n", rc));
1415	return rc;
1416	}
1417
1418	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
1419	static unsigned vdiGetVersion(void *pBackendData)
1420	{
1421	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1422	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1423	unsigned uVersion;
1424
1425	AssertPtr(pImage);
1426
1427	if (pImage)
1428	uVersion = pImage->PreHeader.u32Version;
1429	else
1430	uVersion = 0;
1431
1432	LogFlowFunc(("returns %#x\n", uVersion));
1433	return uVersion;
1434	}
1435
1436	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
1437	static uint64_t vdiGetSize(void *pBackendData)
1438	{
1439	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1440	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1441	uint64_t cbSize;
1442
1443	AssertPtr(pImage);
1444
1445	if (pImage)
1446	cbSize = getImageDiskSize(&pImage->Header);
1447	else
1448	cbSize = 0;
1449
1450	LogFlowFunc(("returns %llu\n", cbSize));
1451	return cbSize;
1452	}
1453
1454	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
1455	static uint64_t vdiGetFileSize(void *pBackendData)
1456	{
1457	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1458	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1459	uint64_t cb = 0;
1460
1461	AssertPtr(pImage);
1462
1463	if (pImage)
1464	{
1465	uint64_t cbFile;
1466	if (pImage->pStorage)
1467	{
1468	int rc = vdiFileGetSize(pImage, &cbFile);
1469	if (RT_SUCCESS(rc))
1470	cb += cbFile;
1471	}
1472	}
1473
1474	LogFlowFunc(("returns %lld\n", cb));
1475	return cb;
1476	}
1477
1478	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
1479	static int vdiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1480	{
1481	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1482	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1483	int rc;
1484
1485	AssertPtr(pImage);
1486
1487	if (pImage)
1488	{
1489	if (pImage->PCHSGeometry.cCylinders)
1490	{
1491	*pPCHSGeometry = pImage->PCHSGeometry;
1492	rc = VINF_SUCCESS;
1493	}
1494	else
1495	rc = VERR_VD_GEOMETRY_NOT_SET;
1496	}
1497	else
1498	rc = VERR_VD_NOT_OPENED;
1499
1500	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1501	return rc;
1502	}
1503
1504	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
1505	static int vdiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1506	{
1507	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1508	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1509	int rc;
1510
1511	AssertPtr(pImage);
1512
1513	if (pImage)
1514	{
1515	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1516	{
1517	rc = VERR_VD_IMAGE_READ_ONLY;
1518	goto out;
1519	}
1520
1521	pImage->PCHSGeometry = *pPCHSGeometry;
1522	rc = VINF_SUCCESS;
1523	}
1524	else
1525	rc = VERR_VD_NOT_OPENED;
1526
1527	out:
1528	LogFlowFunc(("returns %Rrc\n", rc));
1529	return rc;
1530	}
1531
1532	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
1533	static int vdiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1534	{
1535	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1536	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1537	int rc;
1538
1539	AssertPtr(pImage);
1540
1541	if (pImage)
1542	{
1543	VDIDISKGEOMETRY DummyGeo = { 0, 0, 0, VDI_GEOMETRY_SECTOR_SIZE };
1544	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
1545	if (!pGeometry)
1546	pGeometry = &DummyGeo;
1547
1548	if ( pGeometry->cCylinders > 0
1549	&& pGeometry->cHeads > 0
1550	&& pGeometry->cSectors > 0)
1551	{
1552	pLCHSGeometry->cCylinders = pGeometry->cCylinders;
1553	pLCHSGeometry->cHeads = pGeometry->cHeads;
1554	pLCHSGeometry->cSectors = pGeometry->cSectors;
1555	rc = VINF_SUCCESS;
1556	}
1557	else
1558	rc = VERR_VD_GEOMETRY_NOT_SET;
1559	}
1560	else
1561	rc = VERR_VD_NOT_OPENED;
1562
1563	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1564	return rc;
1565	}
1566
1567	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
1568	static int vdiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1569	{
1570	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
1571	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1572	PVDIDISKGEOMETRY pGeometry;
1573	int rc;
1574
1575	AssertPtr(pImage);
1576
1577	if (pImage)
1578	{
1579	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1580	{
1581	rc = VERR_VD_IMAGE_READ_ONLY;
1582	goto out;
1583	}
1584
1585	pGeometry = getImageLCHSGeometry(&pImage->Header);
1586	if (pGeometry)
1587	{
1588	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
1589	pGeometry->cHeads = pLCHSGeometry->cHeads;
1590	pGeometry->cSectors = pLCHSGeometry->cSectors;
1591	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
1592
1593	/* Update header information in base image file. */
1594	vdiFlushImage(pImage);
1595	}
1596	rc = VINF_SUCCESS;
1597	}
1598	else
1599	rc = VERR_VD_NOT_OPENED;
1600
1601	out:
1602	LogFlowFunc(("returns %Rrc\n", rc));
1603	return rc;
1604	}
1605
1606	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
1607	static unsigned vdiGetImageFlags(void *pBackendData)
1608	{
1609	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1610	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1611	unsigned uImageFlags;
1612
1613	AssertPtr(pImage);
1614
1615	if (pImage)
1616	uImageFlags = pImage->uImageFlags;
1617	else
1618	uImageFlags = 0;
1619
1620	LogFlowFunc(("returns %#x\n", uImageFlags));
1621	return uImageFlags;
1622	}
1623
1624	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
1625	static unsigned vdiGetOpenFlags(void *pBackendData)
1626	{
1627	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1628	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1629	unsigned uOpenFlags;
1630
1631	AssertPtr(pImage);
1632
1633	if (pImage)
1634	uOpenFlags = pImage->uOpenFlags;
1635	else
1636	uOpenFlags = 0;
1637
1638	LogFlowFunc(("returns %#x\n", uOpenFlags));
1639	return uOpenFlags;
1640	}
1641
1642	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
1643	static int vdiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
1644	{
1645	LogFlowFunc(("pBackendData=%#p uOpenFlags=%#x\n", pBackendData, uOpenFlags));
1646	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1647	int rc;
1648	const char *pszFilename;
1649
1650	/* Image must be opened and the new flags must be valid. */
1651	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE \| VD_OPEN_FLAGS_SEQUENTIAL)))
1652	{
1653	rc = VERR_INVALID_PARAMETER;
1654	goto out;
1655	}
1656
1657	/* Implement this operation via reopening the image. */
1658	pszFilename = pImage->pszFilename;
1659	rc = vdiFreeImage(pImage, false);
1660	if (RT_FAILURE(rc))
1661	goto out;
1662	rc = vdiOpenImage(pImage, uOpenFlags);
1663
1664	out:
1665	LogFlowFunc(("returns %Rrc\n", rc));
1666	return rc;
1667	}
1668
1669	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1670	static int vdiGetComment(void pBackendData, char pszComment,
1671	size_t cbComment)
1672	{
1673	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
1674	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1675	int rc = VINF_SUCCESS;
1676
1677	AssertPtr(pImage);
1678
1679	if (pImage)
1680	{
1681	char *pszTmp = getImageComment(&pImage->Header);
1682	/* Make this foolproof even if the image doesn't have the zero
1683	* termination. With some luck the repaired header will be saved. */
1684	size_t cb = RTStrNLen(pszTmp, VDI_IMAGE_COMMENT_SIZE);
1685	if (cb == VDI_IMAGE_COMMENT_SIZE)
1686	{
1687	pszTmp[VDI_IMAGE_COMMENT_SIZE-1] = '\0';
1688	cb--;
1689	}
1690	if (cb < cbComment)
1691	{
1692	/* memcpy is much better than strncpy. */
1693	memcpy(pszComment, pszTmp, cb + 1);
1694	}
1695	else
1696	rc = VERR_BUFFER_OVERFLOW;
1697	}
1698	else
1699	rc = VERR_VD_NOT_OPENED;
1700
1701	LogFlowFunc(("returns %Rrc comment=\"%s\"\n", rc, pszComment));
1702	return rc;
1703	}
1704
1705	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
1706	static int vdiSetComment(void pBackendData, const char pszComment)
1707	{
1708	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
1709	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1710	int rc;
1711
1712	AssertPtr(pImage);
1713
1714	if (pImage)
1715	{
1716	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1717	rc = VERR_VD_IMAGE_READ_ONLY;
1718	else
1719	{
1720	size_t cchComment = pszComment ? strlen(pszComment) : 0;
1721	if (cchComment >= VDI_IMAGE_COMMENT_SIZE)
1722	{
1723	LogFunc(("pszComment is too long, %d bytes!\n", cchComment));
1724	rc = VERR_VD_VDI_COMMENT_TOO_LONG;
1725	goto out;
1726	}
1727
1728	/* we don't support old style images */
1729	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1730	{
1731	/*
1732	* Update the comment field, making sure to zero out all of the previous comment.
1733	*/
1734	memset(pImage->Header.u.v1.szComment, '\0', VDI_IMAGE_COMMENT_SIZE);
1735	memcpy(pImage->Header.u.v1.szComment, pszComment, cchComment);
1736
1737	/* write out new the header */
1738	rc = vdiUpdateHeader(pImage);
1739	}
1740	else
1741	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1742	}
1743	}
1744	else
1745	rc = VERR_VD_NOT_OPENED;
1746
1747	out:
1748	LogFlowFunc(("returns %Rrc\n", rc));
1749	return rc;
1750	}
1751
1752	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
1753	static int vdiGetUuid(void *pBackendData, PRTUUID pUuid)
1754	{
1755	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1756	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1757	int rc;
1758
1759	AssertPtr(pImage);
1760
1761	if (pImage)
1762	{
1763	pUuid = getImageCreationUUID(&pImage->Header);
1764	rc = VINF_SUCCESS;
1765	}
1766	else
1767	rc = VERR_VD_NOT_OPENED;
1768
1769	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1770	return rc;
1771	}
1772
1773	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
1774	static int vdiSetUuid(void *pBackendData, PCRTUUID pUuid)
1775	{
1776	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1777	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1778	int rc = VINF_SUCCESS;
1779
1780	AssertPtr(pImage);
1781
1782	if (pImage)
1783	{
1784	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1785	{
1786	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1787	pImage->Header.u.v1.uuidCreate = *pUuid;
1788	/* Make it possible to clone old VDIs. */
1789	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1790	pImage->Header.u.v0.uuidCreate = *pUuid;
1791	else
1792	{
1793	LogFunc(("Version is not supported!\n"));
1794	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1795	}
1796	}
1797	else
1798	rc = VERR_VD_IMAGE_READ_ONLY;
1799	}
1800	else
1801	rc = VERR_VD_NOT_OPENED;
1802
1803	LogFlowFunc(("returns %Rrc\n", rc));
1804	return rc;
1805	}
1806
1807	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
1808	static int vdiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
1809	{
1810	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1811	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1812	int rc;
1813
1814	AssertPtr(pImage);
1815
1816	if (pImage)
1817	{
1818	pUuid = getImageModificationUUID(&pImage->Header);
1819	rc = VINF_SUCCESS;
1820	}
1821	else
1822	rc = VERR_VD_NOT_OPENED;
1823
1824	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1825	return rc;
1826	}
1827
1828	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
1829	static int vdiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
1830	{
1831	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1832	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1833	int rc = VINF_SUCCESS;
1834
1835	AssertPtr(pImage);
1836
1837	if (pImage)
1838	{
1839	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1840	{
1841	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1842	pImage->Header.u.v1.uuidModify = *pUuid;
1843	/* Make it possible to clone old VDIs. */
1844	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1845	pImage->Header.u.v0.uuidModify = *pUuid;
1846	else
1847	{
1848	LogFunc(("Version is not supported!\n"));
1849	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1850	}
1851	}
1852	else
1853	rc = VERR_VD_IMAGE_READ_ONLY;
1854	}
1855	else
1856	rc = VERR_VD_NOT_OPENED;
1857
1858	LogFlowFunc(("returns %Rrc\n", rc));
1859	return rc;
1860	}
1861
1862	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
1863	static int vdiGetParentUuid(void *pBackendData, PRTUUID pUuid)
1864	{
1865	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1866	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1867	int rc;
1868
1869	AssertPtr(pImage);
1870
1871	if (pImage)
1872	{
1873	pUuid = getImageParentUUID(&pImage->Header);
1874	rc = VINF_SUCCESS;
1875	}
1876	else
1877	rc = VERR_VD_NOT_OPENED;
1878
1879	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1880	return rc;
1881	}
1882
1883	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
1884	static int vdiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
1885	{
1886	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1887	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1888	int rc = VINF_SUCCESS;
1889
1890	AssertPtr(pImage);
1891
1892	if (pImage)
1893	{
1894	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1895	{
1896	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1897	pImage->Header.u.v1.uuidLinkage = *pUuid;
1898	/* Make it possible to clone old VDIs. */
1899	else if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0)
1900	pImage->Header.u.v0.uuidLinkage = *pUuid;
1901	else
1902	{
1903	LogFunc(("Version is not supported!\n"));
1904	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1905	}
1906	}
1907	else
1908	rc = VERR_VD_IMAGE_READ_ONLY;
1909	}
1910	else
1911	rc = VERR_VD_NOT_OPENED;
1912
1913	LogFlowFunc(("returns %Rrc\n", rc));
1914	return rc;
1915	}
1916
1917	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
1918	static int vdiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
1919	{
1920	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
1921	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1922	int rc;
1923
1924	AssertPtr(pImage);
1925
1926	if (pImage)
1927	{
1928	pUuid = getImageParentModificationUUID(&pImage->Header);
1929	rc = VINF_SUCCESS;
1930	}
1931	else
1932	rc = VERR_VD_NOT_OPENED;
1933
1934	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
1935	return rc;
1936	}
1937
1938	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
1939	static int vdiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
1940	{
1941	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
1942	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1943	int rc = VINF_SUCCESS;
1944
1945	AssertPtr(pImage);
1946
1947	if (pImage)
1948	{
1949	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1950	{
1951	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) == 1)
1952	pImage->Header.u.v1.uuidParentModify = *pUuid;
1953	else
1954	{
1955	LogFunc(("Version is not supported!\n"));
1956	rc = VERR_VD_VDI_UNSUPPORTED_VERSION;
1957	}
1958	}
1959	else
1960	rc = VERR_VD_IMAGE_READ_ONLY;
1961	}
1962	else
1963	rc = VERR_VD_NOT_OPENED;
1964
1965	LogFlowFunc(("returns %Rrc\n", rc));
1966	return rc;
1967	}
1968
1969	/** @copydoc VBOXHDDBACKEND::pfnDump */
1970	static void vdiDump(void *pBackendData)
1971	{
1972	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
1973
1974	vdiMessage(pImage, "Dumping VDI image \"%s\" mode=%s uOpenFlags=%X File=%#p\n",
1975	pImage->pszFilename,
1976	(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) ? "r/o" : "r/w",
1977	pImage->uOpenFlags,
1978	pImage->pStorage);
1979	vdiMessage(pImage, "Header: Version=%08X Type=%X Flags=%X Size=%llu\n",
1980	pImage->PreHeader.u32Version,
1981	getImageType(&pImage->Header),
1982	getImageFlags(&pImage->Header),
1983	getImageDiskSize(&pImage->Header));
1984	vdiMessage(pImage, "Header: cbBlock=%u cbBlockExtra=%u cBlocks=%u cBlocksAllocated=%u\n",
1985	getImageBlockSize(&pImage->Header),
1986	getImageExtraBlockSize(&pImage->Header),
1987	getImageBlocks(&pImage->Header),
1988	getImageBlocksAllocated(&pImage->Header));
1989	vdiMessage(pImage, "Header: offBlocks=%u offData=%u\n",
1990	getImageBlocksOffset(&pImage->Header),
1991	getImageDataOffset(&pImage->Header));
1992	PVDIDISKGEOMETRY pg = getImageLCHSGeometry(&pImage->Header);
1993	if (pg)
1994	vdiMessage(pImage, "Header: Geometry: C/H/S=%u/%u/%u cbSector=%u\n",
1995	pg->cCylinders, pg->cHeads, pg->cSectors, pg->cbSector);
1996	vdiMessage(pImage, "Header: uuidCreation={%RTuuid}\n", getImageCreationUUID(&pImage->Header));
1997	vdiMessage(pImage, "Header: uuidModification={%RTuuid}\n", getImageModificationUUID(&pImage->Header));
1998	vdiMessage(pImage, "Header: uuidParent={%RTuuid}\n", getImageParentUUID(&pImage->Header));
1999	if (GET_MAJOR_HEADER_VERSION(&pImage->Header) >= 1)
2000	vdiMessage(pImage, "Header: uuidParentModification={%RTuuid}\n", getImageParentModificationUUID(&pImage->Header));
2001	vdiMessage(pImage, "Image: fFlags=%08X offStartBlocks=%u offStartData=%u\n",
2002	pImage->uImageFlags, pImage->offStartBlocks, pImage->offStartData);
2003	vdiMessage(pImage, "Image: uBlockMask=%08X cbTotalBlockData=%u uShiftOffset2Index=%u offStartBlockData=%u\n",
2004	pImage->uBlockMask,
2005	pImage->cbTotalBlockData,
2006	pImage->uShiftOffset2Index,
2007	pImage->offStartBlockData);
2008
2009	unsigned uBlock, cBlocksNotFree, cBadBlocks, cBlocks = getImageBlocks(&pImage->Header);
2010	for (uBlock=0, cBlocksNotFree=0, cBadBlocks=0; uBlock<cBlocks; uBlock++)
2011	{
2012	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2013	{
2014	cBlocksNotFree++;
2015	if (pImage->paBlocks[uBlock] >= cBlocks)
2016	cBadBlocks++;
2017	}
2018	}
2019	if (cBlocksNotFree != getImageBlocksAllocated(&pImage->Header))
2020	{
2021	vdiMessage(pImage, "!! WARNING: %u blocks actually allocated (cBlocksAllocated=%u) !!\n",
2022	cBlocksNotFree, getImageBlocksAllocated(&pImage->Header));
2023	}
2024	if (cBadBlocks)
2025	{
2026	vdiMessage(pImage, "!! WARNING: %u bad blocks found !!\n",
2027	cBadBlocks);
2028	}
2029	}
2030
2031	static int vdiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
2032	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
2033	{
2034	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
2035	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
2036	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2037	unsigned uBlock;
2038	unsigned offRead;
2039	int rc;
2040
2041	AssertPtr(pImage);
2042	Assert(!(uOffset % 512));
2043	Assert(!(cbToRead % 512));
2044
2045	if ( uOffset + cbToRead > getImageDiskSize(&pImage->Header)
2046	\|\| !VALID_PTR(pIoCtx)
2047	\|\| !cbToRead)
2048	{
2049	rc = VERR_INVALID_PARAMETER;
2050	goto out;
2051	}
2052
2053	/* Calculate starting block number and offset inside it. */
2054	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2055	offRead = (unsigned)uOffset & pImage->uBlockMask;
2056
2057	/* Clip read range to at most the rest of the block. */
2058	cbToRead = RT_MIN(cbToRead, getImageBlockSize(&pImage->Header) - offRead);
2059	Assert(!(cbToRead % 512));
2060
2061	if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_FREE)
2062	rc = VERR_VD_BLOCK_FREE;
2063	else if (pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO)
2064	{
2065	size_t cbSet;
2066
2067	cbSet = vdiFileIoCtxSet(pImage, pIoCtx, 0, cbToRead);
2068	Assert(cbSet == cbToRead);
2069
2070	rc = VINF_SUCCESS;
2071	}
2072	else
2073	{
2074	/* Block present in image file, read relevant data. */
2075	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2076	+ (pImage->offStartData + pImage->offStartBlockData + offRead);
2077	rc = vdiFileReadUserAsync(pImage, u64Offset, pIoCtx, cbToRead);
2078	}
2079
2080	if (pcbActuallyRead)
2081	*pcbActuallyRead = cbToRead;
2082
2083	out:
2084	LogFlowFunc(("returns %Rrc\n", rc));
2085	return rc;
2086	}
2087
2088	static int vdiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
2089	PVDIOCTX pIoCtx,
2090	size_t pcbWriteProcess, size_t pcbPreRead,
2091	size_t *pcbPostRead, unsigned fWrite)
2092	{
2093	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
2094	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2095	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2096	unsigned uBlock;
2097	unsigned offWrite;
2098	int rc = VINF_SUCCESS;
2099
2100	AssertPtr(pImage);
2101	Assert(!(uOffset % 512));
2102	Assert(!(cbToWrite % 512));
2103
2104	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2105	{
2106	rc = VERR_VD_IMAGE_READ_ONLY;
2107	goto out;
2108	}
2109
2110	if (!VALID_PTR(pIoCtx) \|\| !cbToWrite)
2111	{
2112	rc = VERR_INVALID_PARAMETER;
2113	goto out;
2114	}
2115
2116	/* No size check here, will do that later. For dynamic images which are
2117	* not multiples of the block size in length, this would prevent writing to
2118	* the last block. */
2119
2120	/* Calculate starting block number and offset inside it. */
2121	uBlock = (unsigned)(uOffset >> pImage->uShiftOffset2Index);
2122	offWrite = (unsigned)uOffset & pImage->uBlockMask;
2123
2124	/* Clip write range to at most the rest of the block. */
2125	cbToWrite = RT_MIN(cbToWrite, getImageBlockSize(&pImage->Header) - offWrite);
2126	Assert(!(cbToWrite % 512));
2127
2128	do
2129	{
2130	if (!IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[uBlock]))
2131	{
2132	/* Block is either free or zero. */
2133	if ( !(pImage->uOpenFlags & VD_OPEN_FLAGS_HONOR_ZEROES)
2134	&& ( pImage->paBlocks[uBlock] == VDI_IMAGE_BLOCK_ZERO
2135	\|\| cbToWrite == getImageBlockSize(&pImage->Header)))
2136	{
2137	#if 0 /** @todo Provide interface to check an I/O context for a specific value */
2138	/* If the destination block is unallocated at this point, it's
2139	* either a zero block or a block which hasn't been used so far
2140	* (which also means that it's a zero block. Don't need to write
2141	* anything to this block if the data consists of just zeroes. */
2142	Assert(!(cbToWrite % 4));
2143	Assert(cbToWrite * 8 <= UINT32_MAX);
2144	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)cbToWrite 8) == -1)
2145	{
2146	pImage->paBlocks[uBlock] = VDI_IMAGE_BLOCK_ZERO;
2147	break;
2148	}
2149	#endif
2150	}
2151
2152	if ( cbToWrite == getImageBlockSize(&pImage->Header)
2153	&& !(fWrite & VD_WRITE_NO_ALLOC))
2154	{
2155	/* Full block write to previously unallocated block.
2156	* Allocate block and write data. */
2157	Assert(!offWrite);
2158	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header);
2159	uint64_t u64Offset = (uint64_t)cBlocksAllocated * pImage->cbTotalBlockData
2160	+ (pImage->offStartData + pImage->offStartBlockData);
2161	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2162	if (RT_UNLIKELY(RT_FAILURE_NP(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS)))
2163	goto out;
2164	pImage->paBlocks[uBlock] = cBlocksAllocated;
2165	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated + 1);
2166
2167	rc = vdiUpdateBlockInfoAsync(pImage, uBlock, pIoCtx);
2168	if (RT_FAILURE(rc) && (rc != VERR_VD_ASYNC_IO_IN_PROGRESS))
2169	goto out;
2170
2171	*pcbPreRead = 0;
2172	*pcbPostRead = 0;
2173	}
2174	else
2175	{
2176	/* Trying to do a partial write to an unallocated block. Don't do
2177	* anything except letting the upper layer know what to do. */
2178	*pcbPreRead = offWrite % getImageBlockSize(&pImage->Header);
2179	pcbPostRead = getImageBlockSize(&pImage->Header) - cbToWrite - pcbPreRead;
2180	rc = VERR_VD_BLOCK_FREE;
2181	}
2182	}
2183	else
2184	{
2185	/* Block present in image file, write relevant data. */
2186	uint64_t u64Offset = (uint64_t)pImage->paBlocks[uBlock] * pImage->cbTotalBlockData
2187	+ (pImage->offStartData + pImage->offStartBlockData + offWrite);
2188	rc = vdiFileWriteUserAsync(pImage, u64Offset, pIoCtx, cbToWrite, NULL, NULL);
2189	}
2190	} while (0);
2191
2192	if (pcbWriteProcess)
2193	*pcbWriteProcess = cbToWrite;
2194
2195	out:
2196	LogFlowFunc(("returns %Rrc\n", rc));
2197	return rc;
2198	}
2199
2200	static int vdiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
2201	{
2202	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2203	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2204	int rc = VINF_SUCCESS;
2205
2206	Assert(pImage);
2207
2208	rc = vdiFlushImageAsync(pImage, pIoCtx);
2209	LogFlowFunc(("returns %Rrc\n", rc));
2210	return rc;
2211	}
2212
2213	/** @copydoc VBOXHDDBACKEND::pfnCompact */
2214	static int vdiCompact(void *pBackendData, unsigned uPercentStart,
2215	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2216	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2217	{
2218	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2219	int rc = VINF_SUCCESS;
2220	void pvBuf = NULL, pvTmp = NULL;
2221	unsigned *paBlocks2 = NULL;
2222
2223	int (pfnParentRead)(void , uint64_t, void *, size_t) = NULL;
2224	void *pvParent = NULL;
2225	PVDINTERFACE pIfParentState = VDInterfaceGet(pVDIfsOperation,
2226	VDINTERFACETYPE_PARENTSTATE);
2227	PVDINTERFACEPARENTSTATE pCbParentState = NULL;
2228	if (pIfParentState)
2229	{
2230	pCbParentState = VDGetInterfaceParentState(pIfParentState);
2231	if (pCbParentState)
2232	pfnParentRead = pCbParentState->pfnParentRead;
2233	pvParent = pIfParentState->pvUser;
2234	}
2235
2236	PFNVDPROGRESS pfnProgress = NULL;
2237	void *pvUser = NULL;
2238	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2239	VDINTERFACETYPE_PROGRESS);
2240	PVDINTERFACEPROGRESS pCbProgress = NULL;
2241	if (pIfProgress)
2242	{
2243	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2244	if (pCbProgress)
2245	pfnProgress = pCbProgress->pfnProgress;
2246	pvUser = pIfProgress->pvUser;
2247	}
2248
2249	do {
2250	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2251
2252	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2253	rc = VERR_VD_IMAGE_READ_ONLY);
2254
2255	unsigned cBlocks;
2256	unsigned cBlocksToMove = 0;
2257	size_t cbBlock;
2258	cBlocks = getImageBlocks(&pImage->Header);
2259	cbBlock = getImageBlockSize(&pImage->Header);
2260	if (pfnParentRead)
2261	{
2262	pvBuf = RTMemTmpAlloc(cbBlock);
2263	AssertBreakStmt(VALID_PTR(pvBuf), rc = VERR_NO_MEMORY);
2264	}
2265	pvTmp = RTMemTmpAlloc(cbBlock);
2266	AssertBreakStmt(VALID_PTR(pvTmp), rc = VERR_NO_MEMORY);
2267
2268	uint64_t cbFile;
2269	rc = vdiFileGetSize(pImage, &cbFile);
2270	AssertRCBreak(rc);
2271	unsigned cBlocksAllocated = (unsigned)((cbFile - pImage->offStartData - pImage->offStartBlockData) >> pImage->uShiftOffset2Index);
2272	if (cBlocksAllocated == 0)
2273	{
2274	/* No data blocks in this image, no need to compact. */
2275	rc = VINF_SUCCESS;
2276	break;
2277	}
2278
2279	/* Allocate block array for back resolving. */
2280	paBlocks2 = (unsigned )RTMemAlloc(sizeof(unsigned ) * cBlocksAllocated);
2281	AssertBreakStmt(VALID_PTR(paBlocks2), rc = VERR_NO_MEMORY);
2282	/* Fill out back resolving, check/fix allocation errors before
2283	* compacting the image, just to be on the safe side. Update the
2284	* image contents straight away, as this enables cancelling. */
2285	for (unsigned i = 0; i < cBlocksAllocated; i++)
2286	paBlocks2[i] = VDI_IMAGE_BLOCK_FREE;
2287	rc = VINF_SUCCESS;
2288	for (unsigned i = 0; i < cBlocks; i++)
2289	{
2290	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2291	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2292	{
2293	if (ptrBlock < cBlocksAllocated)
2294	{
2295	if (paBlocks2[ptrBlock] == VDI_IMAGE_BLOCK_FREE)
2296	paBlocks2[ptrBlock] = i;
2297	else
2298	{
2299	LogFunc(("Freed cross-linked block %u in file \"%s\"\n",
2300	i, pImage->pszFilename));
2301	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2302	rc = vdiUpdateBlockInfo(pImage, i);
2303	if (RT_FAILURE(rc))
2304	break;
2305	}
2306	}
2307	else
2308	{
2309	LogFunc(("Freed out of bounds reference for block %u in file \"%s\"\n",
2310	i, pImage->pszFilename));
2311	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2312	rc = vdiUpdateBlockInfo(pImage, i);
2313	if (RT_FAILURE(rc))
2314	break;
2315	}
2316	}
2317	}
2318	if (RT_FAILURE(rc))
2319	break;
2320
2321	/* Find redundant information and update the block pointers
2322	* accordingly, creating bubbles. Keep disk up to date, as this
2323	* enables cancelling. */
2324	for (unsigned i = 0; i < cBlocks; i++)
2325	{
2326	VDIIMAGEBLOCKPOINTER ptrBlock = pImage->paBlocks[i];
2327	if (IS_VDI_IMAGE_BLOCK_ALLOCATED(ptrBlock))
2328	{
2329	/* Block present in image file, read relevant data. */
2330	uint64_t u64Offset = (uint64_t)ptrBlock * pImage->cbTotalBlockData
2331	+ (pImage->offStartData + pImage->offStartBlockData);
2332	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2333	if (RT_FAILURE(rc))
2334	break;
2335
2336	if (ASMBitFirstSet((volatile void )pvTmp, (uint32_t)cbBlock 8) == -1)
2337	{
2338	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_ZERO;
2339	rc = vdiUpdateBlockInfo(pImage, i);
2340	if (RT_FAILURE(rc))
2341	break;
2342	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2343	/* Adjust progress info, one block to be relocated. */
2344	cBlocksToMove++;
2345	}
2346	else if (pfnParentRead)
2347	{
2348	rc = pfnParentRead(pvParent, i * cbBlock, pvBuf, cbBlock);
2349	if (RT_FAILURE(rc))
2350	break;
2351	if (!memcmp(pvTmp, pvBuf, cbBlock))
2352	{
2353	pImage->paBlocks[i] = VDI_IMAGE_BLOCK_FREE;
2354	rc = vdiUpdateBlockInfo(pImage, i);
2355	if (RT_FAILURE(rc))
2356	break;
2357	paBlocks2[ptrBlock] = VDI_IMAGE_BLOCK_FREE;
2358	/* Adjust progress info, one block to be relocated. */
2359	cBlocksToMove++;
2360	}
2361	}
2362	}
2363
2364	if (pCbProgress && pCbProgress->pfnProgress)
2365	{
2366	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2367	(uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2368	if (RT_FAILURE(rc))
2369	break;
2370	}
2371	}
2372	if (RT_FAILURE(rc))
2373	break;
2374
2375	/* Fill bubbles with other data (if available). */
2376	unsigned cBlocksMoved = 0;
2377	unsigned uBlockUsedPos = cBlocksAllocated;
2378	for (unsigned i = 0; i < cBlocksAllocated; i++)
2379	{
2380	unsigned uBlock = paBlocks2[i];
2381	if (uBlock == VDI_IMAGE_BLOCK_FREE)
2382	{
2383	unsigned uBlockData = VDI_IMAGE_BLOCK_FREE;
2384	while (uBlockUsedPos > i && uBlockData == VDI_IMAGE_BLOCK_FREE)
2385	{
2386	uBlockUsedPos--;
2387	uBlockData = paBlocks2[uBlockUsedPos];
2388	}
2389	/* Terminate early if there is no block which needs copying. */
2390	if (uBlockUsedPos == i)
2391	break;
2392	uint64_t u64Offset = (uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2393	+ (pImage->offStartData + pImage->offStartBlockData);
2394	rc = vdiFileReadSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2395	u64Offset = (uint64_t)i * pImage->cbTotalBlockData
2396	+ (pImage->offStartData + pImage->offStartBlockData);
2397	rc = vdiFileWriteSync(pImage, u64Offset, pvTmp, cbBlock, NULL);
2398	pImage->paBlocks[uBlockData] = i;
2399	setImageBlocksAllocated(&pImage->Header, cBlocksAllocated - cBlocksMoved);
2400	rc = vdiUpdateBlockInfo(pImage, uBlockData);
2401	if (RT_FAILURE(rc))
2402	break;
2403	paBlocks2[i] = uBlockData;
2404	paBlocks2[uBlockUsedPos] = VDI_IMAGE_BLOCK_FREE;
2405	cBlocksMoved++;
2406	}
2407
2408	if (pCbProgress && pCbProgress->pfnProgress)
2409	{
2410	rc = pCbProgress->pfnProgress(pIfProgress->pvUser,
2411	(uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2412
2413	if (RT_FAILURE(rc))
2414	break;
2415	}
2416	}
2417	if (RT_FAILURE(rc))
2418	break;
2419
2420	/* Update image header. */
2421	setImageBlocksAllocated(&pImage->Header, uBlockUsedPos);
2422	vdiUpdateHeader(pImage);
2423
2424	/* Truncate the image to the proper size to finish compacting. */
2425	rc = vdiFileSetSize(pImage,
2426	(uint64_t)uBlockUsedPos * pImage->cbTotalBlockData
2427	+ pImage->offStartData + pImage->offStartBlockData);
2428	} while (0);
2429
2430	if (paBlocks2)
2431	RTMemTmpFree(paBlocks2);
2432	if (pvTmp)
2433	RTMemTmpFree(pvTmp);
2434	if (pvBuf)
2435	RTMemTmpFree(pvBuf);
2436
2437	if (RT_SUCCESS(rc) && pCbProgress && pCbProgress->pfnProgress)
2438	{
2439	pCbProgress->pfnProgress(pIfProgress->pvUser,
2440	uPercentStart + uPercentSpan);
2441	}
2442
2443	LogFlowFunc(("returns %Rrc\n", rc));
2444	return rc;
2445	}
2446
2447
2448	/** @copydoc VBOXHDDBACKEND::pfnResize */
2449	static int vdiResize(void *pBackendData, uint64_t cbSize,
2450	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2451	unsigned uPercentStart, unsigned uPercentSpan,
2452	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2453	PVDINTERFACE pVDIfsOperation)
2454	{
2455	PVDIIMAGEDESC pImage = (PVDIIMAGEDESC)pBackendData;
2456	int rc = VINF_SUCCESS;
2457
2458	PFNVDPROGRESS pfnProgress = NULL;
2459	void *pvUser = NULL;
2460	PVDINTERFACE pIfProgress = VDInterfaceGet(pVDIfsOperation,
2461	VDINTERFACETYPE_PROGRESS);
2462	PVDINTERFACEPROGRESS pCbProgress = NULL;
2463	if (pIfProgress)
2464	{
2465	pCbProgress = VDGetInterfaceProgress(pIfProgress);
2466	if (pCbProgress)
2467	pfnProgress = pCbProgress->pfnProgress;
2468	pvUser = pIfProgress->pvUser;
2469	}
2470
2471	/*
2472	* Making the image smaller is not supported at the moment.
2473	* Resizing is also not supported for fixed size images and
2474	* very old images.
2475	*/
2476	/** @todo implement making the image smaller, it is the responsibility of
2477	* the user to know what he's doing. */
2478	if ( cbSize < getImageDiskSize(&pImage->Header)
2479	\|\| GET_MAJOR_HEADER_VERSION(&pImage->Header) == 0
2480	\|\| pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2481	rc = VERR_NOT_SUPPORTED;
2482	else if (cbSize > getImageDiskSize(&pImage->Header))
2483	{
2484	unsigned cBlocksAllocated = getImageBlocksAllocated(&pImage->Header); /** < Blocks currently allocated, doesn't change during resize */
2485	uint32_t cBlocksNew = cbSize / getImageBlockSize(&pImage->Header); /** < New number of blocks in the image after the resize */
2486	if (cbSize % getImageBlockSize(&pImage->Header))
2487	cBlocksNew++;
2488
2489	uint32_t cBlocksOld = getImageBlocks(&pImage->Header); /** < Number of blocks before the resize. */
2490	uint64_t cbBlockspaceNew = cBlocksNew * sizeof(VDIIMAGEBLOCKPOINTER); /** < Required space for the block array after the resize. */
2491	uint64_t offStartDataNew = RT_ALIGN_32(pImage->offStartBlocks + cbBlockspaceNew, VDI_DATA_ALIGN); /** < New start offset for block data after the resize */
2492
2493	if ( pImage->offStartData != offStartDataNew
2494	&& cBlocksAllocated > 0)
2495	{
2496	/* Calculate how many sectors need to be relocated. */
2497	uint64_t cbOverlapping = offStartDataNew - pImage->offStartData;
2498	unsigned cBlocksReloc = cbOverlapping / getImageBlockSize(&pImage->Header);
2499	if (cbOverlapping % getImageBlockSize(&pImage->Header))
2500	cBlocksReloc++;
2501
2502	/* Since only full blocks can be relocated the new data start is
2503	* determined by moving it block by block. */
2504	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2505	offStartDataNew = pImage->offStartData;
2506
2507	/* Do the relocation. */
2508	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2509
2510	/*
2511	* Get the blocks we need to relocate first, they are appended to the end
2512	* of the image.
2513	*/
2514	void pvBuf = NULL, pvZero = NULL;
2515	do
2516	{
2517	VDIIMAGEBLOCKPOINTER uBlock = 0;
2518
2519	/* Allocate data buffer. */
2520	pvBuf = RTMemAllocZ(pImage->cbTotalBlockData);
2521	if (!pvBuf)
2522	{
2523	rc = VERR_NO_MEMORY;
2524	break;
2525	}
2526
2527	/* Allocate buffer for overwriting with zeroes. */
2528	pvZero = RTMemAllocZ(pImage->cbTotalBlockData);
2529	if (!pvZero)
2530	{
2531	rc = VERR_NO_MEMORY;
2532	break;
2533	}
2534
2535	for (unsigned i = 0; i < cBlocksReloc; i++)
2536	{
2537	/* Search the index in the block table. */
2538	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2539	{
2540	if (pImage->paBlocks[idxBlock] == uBlock)
2541	{
2542	/* Read data and append to the end of the image. */
2543	rc = vdiFileReadSync(pImage, offStartDataNew, pvBuf, pImage->cbTotalBlockData, NULL);
2544	if (RT_FAILURE(rc))
2545	break;
2546
2547	uint64_t offBlockAppend;
2548	rc = vdiFileGetSize(pImage, &offBlockAppend);
2549	if (RT_FAILURE(rc))
2550	break;
2551
2552	rc = vdiFileWriteSync(pImage, offBlockAppend, pvBuf, pImage->cbTotalBlockData, NULL);
2553	if (RT_FAILURE(rc))
2554	break;
2555
2556	/* Zero out the old block area. */
2557	rc = vdiFileWriteSync(pImage, offStartDataNew, pvZero, pImage->cbTotalBlockData, NULL);
2558	if (RT_FAILURE(rc))
2559	break;
2560
2561	/* Update block counter. */
2562	pImage->paBlocks[idxBlock] = cBlocksAllocated - 1;
2563
2564	/*
2565	* Decrease the block number of all other entries in the array.
2566	* They were moved one block to the front.
2567	* Doing it as a separate step iterating over the array again
2568	* because an error while relocating the block might end up
2569	* in a corrupted image otherwise.
2570	*/
2571	for (unsigned idxBlock2 = 0; idxBlock2 < cBlocksOld; idxBlock2++)
2572	{
2573	if ( idxBlock2 != idxBlock
2574	&& IS_VDI_IMAGE_BLOCK_ALLOCATED(pImage->paBlocks[idxBlock2]))
2575	pImage->paBlocks[idxBlock2]--;
2576	}
2577
2578	/* Continue with the next block. */
2579	break;
2580	}
2581	}
2582
2583	if (RT_FAILURE(rc))
2584	break;
2585
2586	uBlock++;
2587	offStartDataNew += pImage->cbTotalBlockData;
2588	}
2589	} while (0);
2590
2591	if (pvBuf)
2592	RTMemFree(pvBuf);
2593	if (pvZero)
2594	RTMemFree(pvZero);
2595	}
2596
2597	/*
2598	* We need to update the new offsets for the image data in the out of memory
2599	* case too because we relocated the blocks already.
2600	*/
2601	pImage->offStartData = offStartDataNew;
2602	setImageDataOffset(&pImage->Header, offStartDataNew);
2603
2604	/*
2605	* Relocation done, expand the block array and update the header with
2606	* the new data.
2607	*/
2608	if (RT_SUCCESS(rc))
2609	{
2610	PVDIIMAGEBLOCKPOINTER paBlocksNew = (PVDIIMAGEBLOCKPOINTER)RTMemRealloc(pImage->paBlocks, cbBlockspaceNew);
2611	if (paBlocksNew)
2612	{
2613	pImage->paBlocks = paBlocksNew;
2614
2615	/* Mark the new blocks as unallocated. */
2616	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
2617	pImage->paBlocks[idxBlock] = VDI_IMAGE_BLOCK_FREE;
2618	}
2619	else
2620	rc = VERR_NO_MEMORY;
2621
2622	/* Write the block array before updating the rest. */
2623	rc = vdiFileWriteSync(pImage, pImage->offStartBlocks, pImage->paBlocks,
2624	cbBlockspaceNew, NULL);
2625
2626	if (RT_SUCCESS(rc))
2627	{
2628	/* Update size and new block count. */
2629	setImageDiskSize(&pImage->Header, cbSize);
2630	setImageBlocks(&pImage->Header, cBlocksNew);
2631	/* Update geometry. */
2632	pImage->PCHSGeometry = *pPCHSGeometry;
2633
2634	PVDIDISKGEOMETRY pGeometry = getImageLCHSGeometry(&pImage->Header);
2635	if (pGeometry)
2636	{
2637	pGeometry->cCylinders = pLCHSGeometry->cCylinders;
2638	pGeometry->cHeads = pLCHSGeometry->cHeads;
2639	pGeometry->cSectors = pLCHSGeometry->cSectors;
2640	pGeometry->cbSector = VDI_GEOMETRY_SECTOR_SIZE;
2641	}
2642	}
2643	}
2644
2645	/* Update header information in base image file. */
2646	vdiFlushImage(pImage);
2647	}
2648	/* Same size doesn't change the image at all. */
2649
2650	LogFlowFunc(("returns %Rrc\n", rc));
2651	return rc;
2652	}
2653
2654
2655	VBOXHDDBACKEND g_VDIBackend =
2656	{
2657	/* pszBackendName */
2658	"VDI",
2659	/* cbSize */
2660	sizeof(VBOXHDDBACKEND),
2661	/* uBackendCaps */
2662	VD_CAP_UUID \| VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC
2663	\| VD_CAP_DIFF \| VD_CAP_FILE \| VD_CAP_ASYNC \| VD_CAP_VFS,
2664	/* paFileExtensions */
2665	s_aVdiFileExtensions,
2666	/* paConfigInfo */
2667	NULL,
2668	/* hPlugin */
2669	NIL_RTLDRMOD,
2670	/* pfnCheckIfValid */
2671	vdiCheckIfValid,
2672	/* pfnOpen */
2673	vdiOpen,
2674	/* pfnCreate */
2675	vdiCreate,
2676	/* pfnRename */
2677	vdiRename,
2678	/* pfnClose */
2679	vdiClose,
2680	/* pfnRead */
2681	vdiRead,
2682	/* pfnWrite */
2683	vdiWrite,
2684	/* pfnFlush */
2685	vdiFlush,
2686	/* pfnGetVersion */
2687	vdiGetVersion,
2688	/* pfnGetSize */
2689	vdiGetSize,
2690	/* pfnGetFileSize */
2691	vdiGetFileSize,
2692	/* pfnGetPCHSGeometry */
2693	vdiGetPCHSGeometry,
2694	/* pfnSetPCHSGeometry */
2695	vdiSetPCHSGeometry,
2696	/* pfnGetLCHSGeometry */
2697	vdiGetLCHSGeometry,
2698	/* pfnSetLCHSGeometry */
2699	vdiSetLCHSGeometry,
2700	/* pfnGetImageFlags */
2701	vdiGetImageFlags,
2702	/* pfnGetOpenFlags */
2703	vdiGetOpenFlags,
2704	/* pfnSetOpenFlags */
2705	vdiSetOpenFlags,
2706	/* pfnGetComment */
2707	vdiGetComment,
2708	/* pfnSetComment */
2709	vdiSetComment,
2710	/* pfnGetUuid */
2711	vdiGetUuid,
2712	/* pfnSetUuid */
2713	vdiSetUuid,
2714	/* pfnGetModificationUuid */
2715	vdiGetModificationUuid,
2716	/* pfnSetModificationUuid */
2717	vdiSetModificationUuid,
2718	/* pfnGetParentUuid */
2719	vdiGetParentUuid,
2720	/* pfnSetParentUuid */
2721	vdiSetParentUuid,
2722	/* pfnGetParentModificationUuid */
2723	vdiGetParentModificationUuid,
2724	/* pfnSetParentModificationUuid */
2725	vdiSetParentModificationUuid,
2726	/* pfnDump */
2727	vdiDump,
2728	/* pfnGetTimeStamp */
2729	NULL,
2730	/* pfnGetParentTimeStamp */
2731	NULL,
2732	/* pfnSetParentTimeStamp */
2733	NULL,
2734	/* pfnGetParentFilename */
2735	NULL,
2736	/* pfnSetParentFilename */
2737	NULL,
2738	/* pfnAsyncRead */
2739	vdiAsyncRead,
2740	/* pfnAsyncWrite */
2741	vdiAsyncWrite,
2742	/* pfnAsyncFlush */
2743	vdiAsyncFlush,
2744	/* pfnComposeLocation */
2745	genericFileComposeLocation,
2746	/* pfnComposeName */
2747	genericFileComposeName,
2748	/* pfnCompact */
2749	vdiCompact,
2750	/* pfnResize */
2751	vdiResize
2752	};

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source: vbox/trunk/src/VBox/Storage/VDI.cpp@ 37483

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