VHD.cpp@ 106212

Last change on this file since 106212 was 106061, checked in by vboxsync, 3 months ago
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1	/* $Id: VHD.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* VHD Disk image, Core Code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_VD_VHD
33	#include <VBox/vd-plugin.h>
34	#include <VBox/err.h>
35
36	#include <VBox/log.h>
37	#include <VBox/version.h>
38	#include <iprt/asm.h>
39	#include <iprt/assert.h>
40	#include <iprt/mem.h>
41	#include <iprt/uuid.h>
42	#include <iprt/path.h>
43	#include <iprt/string.h>
44	#include <iprt/utf16.h>
45
46	#include "VDBackends.h"
47
48	#define VHD_RELATIVE_MAX_PATH 512
49	#define VHD_ABSOLUTE_MAX_PATH 512
50
51	#define VHD_SECTOR_SIZE 512
52	#define VHD_BLOCK_SIZE (2 * _1M)
53
54	/** The maximum VHD size is 2TB due to the 32bit sector numbers in the BAT.
55	* Note that this is the maximum file size including all footers and headers
56	* and not the maximum virtual disk size presented to the guest.
57	*/
58	#define VHD_MAX_SIZE (2 * _1T)
59	/** Maximum number of 512 byte sectors for a VHD image. */
60	#define VHD_MAX_SECTORS (VHD_MAX_SIZE / VHD_SECTOR_SIZE)
61
62	/* This is common to all VHD disk types and is located at the end of the image */
63	#pragma pack(1)
64	typedef struct VHDFooter
65	{
66	char Cookie[8];
67	uint32_t Features;
68	uint32_t Version;
69	uint64_t DataOffset;
70	uint32_t Timestamp;
71	uint8_t CreatorApp[4];
72	uint32_t CreatorVer;
73	uint32_t CreatorOS;
74	uint64_t OrigSize;
75	uint64_t CurSize;
76	uint16_t DiskGeometryCylinder;
77	uint8_t DiskGeometryHeads;
78	uint8_t DiskGeometrySectors;
79	uint32_t DiskType;
80	uint32_t Checksum;
81	char UniqueID[16];
82	uint8_t SavedState;
83	uint8_t Reserved[427];
84	} VHDFooter;
85	#pragma pack()
86
87	/* this really is spelled with only one n */
88	#define VHD_FOOTER_COOKIE "conectix"
89	#define VHD_FOOTER_COOKIE_SIZE 8
90
91	#define VHD_FOOTER_FEATURES_NOT_ENABLED 0
92	#define VHD_FOOTER_FEATURES_TEMPORARY 1
93	#define VHD_FOOTER_FEATURES_RESERVED 2
94
95	#define VHD_FOOTER_FILE_FORMAT_VERSION 0x00010000
96	#define VHD_FOOTER_DATA_OFFSET_FIXED UINT64_C(0xffffffffffffffff)
97	#define VHD_FOOTER_DISK_TYPE_FIXED 2
98	#define VHD_FOOTER_DISK_TYPE_DYNAMIC 3
99	#define VHD_FOOTER_DISK_TYPE_DIFFERENCING 4
100
101	#define VHD_MAX_LOCATOR_ENTRIES 8
102	#define VHD_PLATFORM_CODE_NONE 0
103	#define VHD_PLATFORM_CODE_WI2R 0x57693272
104	#define VHD_PLATFORM_CODE_WI2K 0x5769326B
105	#define VHD_PLATFORM_CODE_W2RU 0x57327275
106	#define VHD_PLATFORM_CODE_W2KU 0x57326B75
107	#define VHD_PLATFORM_CODE_MAC 0x4D163220
108	#define VHD_PLATFORM_CODE_MACX 0x4D163258
109
110	/* Header for expanding disk images. */
111	#pragma pack(1)
112	typedef struct VHDParentLocatorEntry
113	{
114	uint32_t u32Code;
115	uint32_t u32DataSpace;
116	uint32_t u32DataLength;
117	uint32_t u32Reserved;
118	uint64_t u64DataOffset;
119	} VHDPLE, *PVHDPLE;
120
121	typedef struct VHDDynamicDiskHeader
122	{
123	char Cookie[8];
124	uint64_t DataOffset;
125	uint64_t TableOffset;
126	uint32_t HeaderVersion;
127	uint32_t MaxTableEntries;
128	uint32_t BlockSize;
129	uint32_t Checksum;
130	uint8_t ParentUuid[16];
131	uint32_t ParentTimestamp;
132	uint32_t Reserved0;
133	uint16_t ParentUnicodeName[256];
134	VHDPLE ParentLocatorEntry[VHD_MAX_LOCATOR_ENTRIES];
135	uint8_t Reserved1[256];
136	} VHDDynamicDiskHeader;
137	#pragma pack()
138
139	#define VHD_DYNAMIC_DISK_HEADER_COOKIE "cxsparse"
140	#define VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE 8
141	#define VHD_DYNAMIC_DISK_HEADER_VERSION 0x00010000
142
143	/**
144	* Complete VHD image data structure.
145	*/
146	typedef struct VHDIMAGE
147	{
148	/** Image file name. */
149	const char *pszFilename;
150	/** Opaque storage handle. */
151	PVDIOSTORAGE pStorage;
152
153	/** Pointer to the per-disk VD interface list. */
154	PVDINTERFACE pVDIfsDisk;
155	/** Pointer to the per-image VD interface list. */
156	PVDINTERFACE pVDIfsImage;
157	/** Error interface. */
158	PVDINTERFACEERROR pIfError;
159	/** I/O interface. */
160	PVDINTERFACEIOINT pIfIo;
161
162	/** Open flags passed by VBoxHDD layer. */
163	unsigned uOpenFlags;
164	/** Image flags defined during creation or determined during open. */
165	unsigned uImageFlags;
166	/** Total size of the image. */
167	uint64_t cbSize;
168
169	/** Physical geometry of this image. */
170	VDGEOMETRY PCHSGeometry;
171	/** Logical geometry of this image. */
172	VDGEOMETRY LCHSGeometry;
173
174	/** Image UUID. */
175	RTUUID ImageUuid;
176	/** Parent image UUID. */
177	RTUUID ParentUuid;
178
179	/** Parent's time stamp at the time of image creation. */
180	uint32_t u32ParentTimestamp;
181	/** Relative path to the parent image. */
182	char *pszParentFilename;
183
184	/** The Block Allocation Table. */
185	uint32_t *pBlockAllocationTable;
186	/** Number of entries in the table. */
187	uint32_t cBlockAllocationTableEntries;
188
189	/** Size of one data block. */
190	uint32_t cbDataBlock;
191	/** Sectors per data block. */
192	uint32_t cSectorsPerDataBlock;
193	/** Length of the sector bitmap in bytes. */
194	uint32_t cbDataBlockBitmap;
195	/** A copy of the disk footer. */
196	VHDFooter vhdFooterCopy;
197	/** Current end offset of the file (without the disk footer). */
198	uint64_t uCurrentEndOfFile;
199	/** Size of the data block bitmap in sectors. */
200	uint32_t cDataBlockBitmapSectors;
201	/** Start of the block allocation table. */
202	uint64_t uBlockAllocationTableOffset;
203	/** Buffer to hold block's bitmap for bit search operations. */
204	uint8_t *pu8Bitmap;
205	/** Offset to the next data structure (dynamic disk header). */
206	uint64_t u64DataOffset;
207	/** Flag to force dynamic disk header update. */
208	bool fDynHdrNeedsUpdate;
209	/** The static region list. */
210	VDREGIONLIST RegionList;
211	} VHDIMAGE, *PVHDIMAGE;
212
213	/**
214	* Structure tracking the expansion process of the image
215	* for async access.
216	*/
217	typedef struct VHDIMAGEEXPAND
218	{
219	/** Flag indicating the status of each step. */
220	volatile uint32_t fFlags;
221	/** The index in the block allocation table which is written. */
222	uint32_t idxBatAllocated;
223	/** Big endian representation of the block index
224	* which is written in the BAT. */
225	uint32_t idxBlockBe;
226	/** Old end of the file - used for rollback in case of an error. */
227	uint64_t cbEofOld;
228	/** Sector bitmap written to the new block - variable in size. */
229	uint8_t au8Bitmap[1];
230	} VHDIMAGEEXPAND, *PVHDIMAGEEXPAND;
231
232	/**
233	* Flag defines
234	*/
235	#define VHDIMAGEEXPAND_STEP_IN_PROGRESS (0x0)
236	#define VHDIMAGEEXPAND_STEP_FAILED (0x2)
237	#define VHDIMAGEEXPAND_STEP_SUCCESS (0x3)
238	/** All steps completed successfully. */
239	#define VHDIMAGEEXPAND_ALL_SUCCESS (0xff)
240	/** All steps completed (no success indicator) */
241	#define VHDIMAGEEXPAND_ALL_COMPLETE (0xaa)
242
243	/** Every status field has 2 bits so we can encode 4 steps in one byte. */
244	#define VHDIMAGEEXPAND_STATUS_MASK 0x03
245	#define VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT 0x00
246	#define VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT 0x02
247	#define VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT 0x04
248	#define VHDIMAGEEXPAND_BAT_STATUS_SHIFT 0x06
249
250	/**
251	* Helper macros to get and set the status field.
252	*/
253	#define VHDIMAGEEXPAND_STATUS_GET(fFlags, cShift) \
254	(((fFlags) >> (cShift)) & VHDIMAGEEXPAND_STATUS_MASK)
255	#define VHDIMAGEEXPAND_STATUS_SET(fFlags, cShift, uVal) \
256	ASMAtomicOrU32(&(fFlags), ((uVal) & VHDIMAGEEXPAND_STATUS_MASK) << (cShift))
257
258
259	/*********************************************************************************************************************************
260	* Static Variables *
261	*********************************************************************************************************************************/
262
263	/** NULL-terminated array of supported file extensions. */
264	static const VDFILEEXTENSION s_aVhdFileExtensions[] =
265	{
266	{"vhd", VDTYPE_HDD},
267	{NULL, VDTYPE_INVALID}
268	};
269
270
271	/*********************************************************************************************************************************
272	* Internal Functions *
273	*********************************************************************************************************************************/
274
275
276	/**
277	* Internal: Compute and update header checksum.
278	*/
279	static uint32_t vhdChecksum(void *pHeader, uint32_t cbSize)
280	{
281	uint32_t u32ChkSum = 0;
282	for (uint32_t i = 0; i < cbSize; i++)
283	u32ChkSum += ((unsigned char *)pHeader)[i];
284	return ~u32ChkSum;
285	}
286
287	/**
288	* Internal: Convert filename to UTF16 with appropriate endianness.
289	*/
290	static int vhdFilenameToUtf16(const char pszFilename, uint16_t pu16Buf,
291	uint32_t cbBufSize, uint32_t *pcbActualSize,
292	bool fBigEndian)
293	{
294	int rc;
295	PRTUTF16 pTmp16 = NULL;
296	size_t cTmp16Len;
297
298	rc = RTStrToUtf16(pszFilename, &pTmp16);
299	if (RT_SUCCESS(rc))
300	{
301	cTmp16Len = RTUtf16Len(pTmp16);
302	if (cTmp16Len * sizeof(*pTmp16) <= cbBufSize)
303	{
304	if (fBigEndian)
305	for (unsigned i = 0; i < cTmp16Len; i++)
306	pu16Buf[i] = RT_H2BE_U16(pTmp16[i]);
307	else
308	memcpy(pu16Buf, pTmp16, cTmp16Len * sizeof(*pTmp16));
309	if (pcbActualSize)
310	pcbActualSize = (uint32_t)(cTmp16Len sizeof(*pTmp16));
311	}
312	else
313	rc = VERR_FILENAME_TOO_LONG;
314	}
315
316	if (pTmp16)
317	RTUtf16Free(pTmp16);
318	return rc;
319	}
320
321	/**
322	* Internal: Update one locator entry.
323	*/
324	static int vhdLocatorUpdate(PVHDIMAGE pImage, PVHDPLE pLocator, const char *pszFilename)
325	{
326	int rc = VINF_SUCCESS;
327	uint32_t cb = 0;
328	uint32_t cbMaxLen = RT_BE2H_U32(pLocator->u32DataSpace);
329	void *pvBuf = RTMemTmpAllocZ(cbMaxLen);
330	char *pszTmp;
331
332	if (!pvBuf)
333	return VERR_NO_MEMORY;
334
335	switch (RT_BE2H_U32(pLocator->u32Code))
336	{
337	case VHD_PLATFORM_CODE_WI2R:
338	{
339	if (RTPathStartsWithRoot(pszFilename))
340	{
341	/* Convert to relative path. */
342	char szPath[RTPATH_MAX];
343	rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename, true /fFromFile/, pszFilename);
344	if (RT_SUCCESS(rc))
345	{
346	/* Update plain relative name. */
347	cb = (uint32_t)strlen(szPath);
348	if (cb > cbMaxLen)
349	{
350	rc = VERR_FILENAME_TOO_LONG;
351	break;
352	}
353	memcpy(pvBuf, szPath, cb);
354	}
355	}
356	else
357	{
358	/* Update plain relative name. */
359	cb = (uint32_t)strlen(pszFilename);
360	if (cb > cbMaxLen)
361	{
362	rc = VERR_FILENAME_TOO_LONG;
363	break;
364	}
365	memcpy(pvBuf, pszFilename, cb);
366	}
367	if (RT_SUCCESS(rc))
368	pLocator->u32DataLength = RT_H2BE_U32(cb);
369	break;
370	}
371	case VHD_PLATFORM_CODE_WI2K:
372	/* Update plain absolute name. */
373	rc = RTPathAbs(pszFilename, (char *)pvBuf, cbMaxLen);
374	if (RT_SUCCESS(rc))
375	{
376	cb = (uint32_t)strlen((const char *)pvBuf);
377	pLocator->u32DataLength = RT_H2BE_U32(cb);
378	}
379	break;
380	case VHD_PLATFORM_CODE_W2RU:
381	if (RTPathStartsWithRoot(pszFilename))
382	{
383	/* Convert to relative path. */
384	char szPath[RTPATH_MAX];
385	rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename, true /fFromFile/, pszFilename);
386	if (RT_SUCCESS(rc))
387	rc = vhdFilenameToUtf16(szPath, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
388	}
389	else
390	{
391	/* Update unicode relative name. */
392	rc = vhdFilenameToUtf16(pszFilename, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
393	}
394
395	if (RT_SUCCESS(rc))
396	pLocator->u32DataLength = RT_H2BE_U32(cb);
397	break;
398	case VHD_PLATFORM_CODE_W2KU:
399	/* Update unicode absolute name. */
400	pszTmp = (char*)RTMemTmpAllocZ(cbMaxLen);
401	if (!pszTmp)
402	{
403	rc = VERR_NO_MEMORY;
404	break;
405	}
406	rc = RTPathAbs(pszFilename, pszTmp, cbMaxLen);
407	if (RT_FAILURE(rc))
408	{
409	RTMemTmpFree(pszTmp);
410	break;
411	}
412	rc = vhdFilenameToUtf16(pszTmp, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
413	RTMemTmpFree(pszTmp);
414	if (RT_SUCCESS(rc))
415	pLocator->u32DataLength = RT_H2BE_U32(cb);
416	break;
417	default:
418	rc = VERR_NOT_IMPLEMENTED;
419	break;
420	}
421
422	if (RT_SUCCESS(rc))
423	{
424	Assert(cb > 0);
425	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
426	RT_BE2H_U64(pLocator->u64DataOffset),
427	pvBuf, cb);
428	}
429
430	RTMemTmpFree(pvBuf);
431	return rc;
432	}
433
434	/**
435	* Internal: Update dynamic disk header from VHDIMAGE.
436	*/
437	static int vhdDynamicHeaderUpdate(PVHDIMAGE pImage)
438	{
439	VHDDynamicDiskHeader ddh;
440	int rc, i;
441
442	if (!pImage)
443	return VERR_VD_NOT_OPENED;
444
445	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
446	pImage->u64DataOffset, &ddh, sizeof(ddh));
447	if (RT_FAILURE(rc))
448	return rc;
449	if (memcmp(ddh.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE) != 0)
450	return VERR_VD_VHD_INVALID_HEADER;
451
452	uint32_t u32Checksum = RT_BE2H_U32(ddh.Checksum);
453	ddh.Checksum = 0;
454	if (u32Checksum != vhdChecksum(&ddh, sizeof(ddh)))
455	return VERR_VD_VHD_INVALID_HEADER;
456
457	/* Update parent's timestamp. */
458	ddh.ParentTimestamp = RT_H2BE_U32(pImage->u32ParentTimestamp);
459	/* Update parent's filename. */
460	if (pImage->pszParentFilename)
461	{
462	rc = vhdFilenameToUtf16(RTPathFilename(pImage->pszParentFilename),
463	ddh.ParentUnicodeName, sizeof(ddh.ParentUnicodeName) - 1, NULL, true);
464	if (RT_FAILURE(rc))
465	return rc;
466	}
467
468	/* Update parent's locators. */
469	for (i = 0; i < VHD_MAX_LOCATOR_ENTRIES; i++)
470	{
471	/* Skip empty locators */
472	if ( ddh.ParentLocatorEntry[i].u32Code != RT_H2BE_U32(VHD_PLATFORM_CODE_NONE)
473	&& pImage->pszParentFilename)
474	{
475	rc = vhdLocatorUpdate(pImage, &ddh.ParentLocatorEntry[i], pImage->pszParentFilename);
476	if (RT_FAILURE(rc))
477	return rc;
478	}
479	}
480	/* Update parent's UUID */
481	memcpy(ddh.ParentUuid, pImage->ParentUuid.au8, sizeof(ddh.ParentUuid));
482
483	/* Update data offset and number of table entries. */
484	ddh.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries);
485
486	ddh.Checksum = 0;
487	ddh.Checksum = RT_H2BE_U32(vhdChecksum(&ddh, sizeof(ddh)));
488	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
489	pImage->u64DataOffset, &ddh, sizeof(ddh));
490	return rc;
491	}
492
493	/**
494	* Internal: Update the VHD footer.
495	*/
496	static int vhdUpdateFooter(PVHDIMAGE pImage)
497	{
498	int rc = VINF_SUCCESS;
499
500	/* Update fields which can change. */
501	pImage->vhdFooterCopy.CurSize = RT_H2BE_U64(pImage->cbSize);
502	pImage->vhdFooterCopy.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders);
503	pImage->vhdFooterCopy.DiskGeometryHeads = pImage->PCHSGeometry.cHeads;
504	pImage->vhdFooterCopy.DiskGeometrySectors = pImage->PCHSGeometry.cSectors;
505
506	pImage->vhdFooterCopy.Checksum = 0;
507	pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter)));
508
509	if (pImage->pBlockAllocationTable)
510	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0,
511	&pImage->vhdFooterCopy, sizeof(VHDFooter));
512
513	if (RT_SUCCESS(rc))
514	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
515	pImage->uCurrentEndOfFile, &pImage->vhdFooterCopy,
516	sizeof(VHDFooter));
517
518	return rc;
519	}
520
521	/**
522	* Internal. Flush image data to disk.
523	*/
524	static int vhdFlushImage(PVHDIMAGE pImage)
525	{
526	int rc = VINF_SUCCESS;
527
528	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
529	return VINF_SUCCESS;
530
531	if (pImage->pBlockAllocationTable)
532	{
533	/*
534	* This is an expanding image. Write the BAT and copy of the disk footer.
535	*/
536	size_t cbBlockAllocationTableToWrite = pImage->cBlockAllocationTableEntries * sizeof(uint32_t);
537	uint32_t pBlockAllocationTableToWrite = (uint32_t )RTMemAllocZ(cbBlockAllocationTableToWrite);
538
539	if (!pBlockAllocationTableToWrite)
540	return VERR_NO_MEMORY;
541
542	/*
543	* The BAT entries have to be stored in big endian format.
544	*/
545	for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++)
546	pBlockAllocationTableToWrite[i] = RT_H2BE_U32(pImage->pBlockAllocationTable[i]);
547
548	/*
549	* Write the block allocation table after the copy of the disk footer and the dynamic disk header.
550	*/
551	vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset,
552	pBlockAllocationTableToWrite, cbBlockAllocationTableToWrite);
553	if (pImage->fDynHdrNeedsUpdate)
554	rc = vhdDynamicHeaderUpdate(pImage);
555	RTMemFree(pBlockAllocationTableToWrite);
556	}
557
558	if (RT_SUCCESS(rc))
559	rc = vhdUpdateFooter(pImage);
560
561	if (RT_SUCCESS(rc))
562	rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
563
564	return rc;
565	}
566
567	/**
568	* Internal. Free all allocated space for representing an image except pImage,
569	* and optionally delete the image from disk.
570	*/
571	static int vhdFreeImage(PVHDIMAGE pImage, bool fDelete)
572	{
573	int rc = VINF_SUCCESS;
574
575	/* Freeing a never allocated image (e.g. because the open failed) is
576	* not signalled as an error. After all nothing bad happens. */
577	if (pImage)
578	{
579	if (pImage->pStorage)
580	{
581	/* No point updating the file that is deleted anyway. */
582	if (!fDelete)
583	vhdFlushImage(pImage);
584
585	rc = vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
586	pImage->pStorage = NULL;
587	}
588
589	if (pImage->pszParentFilename)
590	{
591	RTStrFree(pImage->pszParentFilename);
592	pImage->pszParentFilename = NULL;
593	}
594	if (pImage->pBlockAllocationTable)
595	{
596	RTMemFree(pImage->pBlockAllocationTable);
597	pImage->pBlockAllocationTable = NULL;
598	}
599	if (pImage->pu8Bitmap)
600	{
601	RTMemFree(pImage->pu8Bitmap);
602	pImage->pu8Bitmap = NULL;
603	}
604
605	if (fDelete && pImage->pszFilename)
606	{
607	int rc2 = vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
608	if (RT_SUCCESS(rc))
609	rc = rc2;
610	}
611	}
612
613	LogFlowFunc(("returns %Rrc\n", rc));
614	return rc;
615	}
616
617	/* 946684800 is the number of seconds between 1/1/1970 and 1/1/2000 */
618	#define VHD_TO_UNIX_EPOCH_SECONDS UINT64_C(946684800)
619
620	static uint32_t vhdRtTime2VhdTime(PCRTTIMESPEC pRtTimestamp)
621	{
622	uint64_t u64Seconds = RTTimeSpecGetSeconds(pRtTimestamp);
623	return (uint32_t)(u64Seconds - VHD_TO_UNIX_EPOCH_SECONDS);
624	}
625
626	static void vhdTime2RtTime(PRTTIMESPEC pRtTimestamp, uint32_t u32VhdTimestamp)
627	{
628	RTTimeSpecSetSeconds(pRtTimestamp, VHD_TO_UNIX_EPOCH_SECONDS + u32VhdTimestamp);
629	}
630
631	/**
632	* Internal: Allocates the block bitmap rounding up to the next 32bit or 64bit boundary.
633	* Can be freed with RTMemFree. The memory is zeroed.
634	*/
635	DECLINLINE(uint8_t *)vhdBlockBitmapAllocate(PVHDIMAGE pImage)
636	{
637	#ifdef RT_ARCH_AMD64
638	return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 8);
639	#else
640	return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 4);
641	#endif
642	}
643
644	/**
645	* Internal: called when the async expansion process completed (failure or success).
646	* Will do the necessary rollback if an error occurred.
647	*/
648	static int vhdAsyncExpansionComplete(PVHDIMAGE pImage, PVDIOCTX pIoCtx, PVHDIMAGEEXPAND pExpand)
649	{
650	int rc = VINF_SUCCESS;
651	uint32_t fFlags = ASMAtomicReadU32(&pExpand->fFlags);
652	bool fIoInProgress = false;
653
654	/* Quick path, check if everything succeeded. */
655	if (fFlags == VHDIMAGEEXPAND_ALL_SUCCESS)
656	{
657	pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = RT_BE2H_U32(pExpand->idxBlockBe);
658	RTMemFree(pExpand);
659	}
660	else
661	{
662	uint32_t uStatus;
663
664	uStatus = VHDIMAGEEXPAND_STATUS_GET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT);
665	if ( uStatus == VHDIMAGEEXPAND_STEP_FAILED
666	\|\| uStatus == VHDIMAGEEXPAND_STEP_SUCCESS)
667	{
668	/* Undo and restore the old value. */
669	pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = ~0U;
670
671	/* Restore the old value on the disk.
672	* No need for a completion callback because we can't
673	* do anything if this fails. */
674	if (uStatus == VHDIMAGEEXPAND_STEP_SUCCESS)
675	{
676	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
677	pImage->uBlockAllocationTableOffset
678	+ pExpand->idxBatAllocated * sizeof(uint32_t),
679	&pImage->pBlockAllocationTable[pExpand->idxBatAllocated],
680	sizeof(uint32_t), pIoCtx, NULL, NULL);
681	fIoInProgress \|= rc == VERR_VD_ASYNC_IO_IN_PROGRESS;
682	}
683	}
684
685	/* Restore old size (including the footer because another application might
686	* fill up the free space making it impossible to add the footer)
687	* and add the footer at the right place again. */
688	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
689	pExpand->cbEofOld + sizeof(VHDFooter));
690	AssertRC(rc);
691
692	pImage->uCurrentEndOfFile = pExpand->cbEofOld;
693	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
694	pImage->uCurrentEndOfFile,
695	&pImage->vhdFooterCopy, sizeof(VHDFooter),
696	pIoCtx, NULL, NULL);
697	fIoInProgress \|= rc == VERR_VD_ASYNC_IO_IN_PROGRESS;
698	}
699
700	return fIoInProgress ? VERR_VD_ASYNC_IO_IN_PROGRESS : rc;
701	}
702
703	static int vhdAsyncExpansionStepCompleted(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq, unsigned iStep)
704	{
705	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
706	PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)pvUser;
707
708	LogFlowFunc(("pBackendData=%#p pIoCtx=%#p pvUser=%#p rcReq=%Rrc iStep=%u\n",
709	pBackendData, pIoCtx, pvUser, rcReq, iStep));
710
711	if (RT_SUCCESS(rcReq))
712	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_SUCCESS);
713	else
714	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_FAILED);
715
716	if ((pExpand->fFlags & VHDIMAGEEXPAND_ALL_COMPLETE) == VHDIMAGEEXPAND_ALL_COMPLETE)
717	return vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand);
718
719	return VERR_VD_ASYNC_IO_IN_PROGRESS;
720	}
721
722	static DECLCALLBACK(int) vhdAsyncExpansionDataBlockBitmapComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
723	{
724	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT);
725	}
726
727	static DECLCALLBACK(int) vhdAsyncExpansionDataComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
728	{
729	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT);
730	}
731
732	static DECLCALLBACK(int) vhdAsyncExpansionBatUpdateComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
733	{
734	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BAT_STATUS_SHIFT);
735	}
736
737	static DECLCALLBACK(int) vhdAsyncExpansionFooterUpdateComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
738	{
739	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT);
740	}
741
742	static int vhdLoadDynamicDisk(PVHDIMAGE pImage, uint64_t uDynamicDiskHeaderOffset)
743	{
744	VHDDynamicDiskHeader vhdDynamicDiskHeader;
745	int rc = VINF_SUCCESS;
746	uint32_t *pBlockAllocationTable;
747	uint64_t uBlockAllocationTableOffset;
748	unsigned i = 0;
749
750	Log(("Open a dynamic disk.\n"));
751
752	/*
753	* Read the dynamic disk header.
754	*/
755	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, uDynamicDiskHeaderOffset,
756	&vhdDynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
757	if (RT_FAILURE(rc))
758	return rc;
759
760	if (memcmp(vhdDynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE))
761	return VERR_INVALID_PARAMETER;
762
763	pImage->cbDataBlock = RT_BE2H_U32(vhdDynamicDiskHeader.BlockSize);
764	LogFlowFunc(("BlockSize=%u\n", pImage->cbDataBlock));
765	pImage->cBlockAllocationTableEntries = RT_BE2H_U32(vhdDynamicDiskHeader.MaxTableEntries);
766	LogFlowFunc(("MaxTableEntries=%lu\n", pImage->cBlockAllocationTableEntries));
767	AssertMsg(!(pImage->cbDataBlock % VHD_SECTOR_SIZE), ("%s: Data block size is not a multiple of %!\n", __FUNCTION__, VHD_SECTOR_SIZE));
768
769	/*
770	* Bail out if the number of BAT entries exceeds the number of sectors for a maximum image.
771	* Lower the number of sectors in the BAT as a few sectors are already occupied by the footers
772	* and headers.
773	*/
774	if (pImage->cBlockAllocationTableEntries > (VHD_MAX_SECTORS - 2))
775	return VERR_VD_VHD_INVALID_HEADER;
776
777	pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE;
778	LogFlowFunc(("SectorsPerDataBlock=%u\n", pImage->cSectorsPerDataBlock));
779
780	/*
781	* Every block starts with a bitmap indicating which sectors are valid and which are not.
782	* We store the size of it to be able to calculate the real offset.
783	*/
784	pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8;
785	pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE;
786	/* Round up to full sector size */
787	if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0)
788	pImage->cDataBlockBitmapSectors++;
789	LogFlowFunc(("cbDataBlockBitmap=%u\n", pImage->cbDataBlockBitmap));
790	LogFlowFunc(("cDataBlockBitmapSectors=%u\n", pImage->cDataBlockBitmapSectors));
791
792	pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage);
793	if (!pImage->pu8Bitmap)
794	return VERR_NO_MEMORY;
795
796	pBlockAllocationTable = (uint32_t )RTMemAllocZ(pImage->cBlockAllocationTableEntries sizeof(uint32_t));
797	if (!pBlockAllocationTable)
798	return VERR_NO_MEMORY;
799
800	/*
801	* Read the table.
802	*/
803	uBlockAllocationTableOffset = RT_BE2H_U64(vhdDynamicDiskHeader.TableOffset);
804	LogFlowFunc(("uBlockAllocationTableOffset=%llu\n", uBlockAllocationTableOffset));
805	pImage->uBlockAllocationTableOffset = uBlockAllocationTableOffset;
806	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
807	uBlockAllocationTableOffset, pBlockAllocationTable,
808	pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
809	if (RT_FAILURE(rc))
810	{
811	RTMemFree(pBlockAllocationTable);
812	return rc;
813	}
814
815	/*
816	* Because the offset entries inside the allocation table are stored big endian
817	* we need to convert them into host endian.
818	*/
819	pImage->pBlockAllocationTable = (uint32_t )RTMemAllocZ(pImage->cBlockAllocationTableEntries sizeof(uint32_t));
820	if (!pImage->pBlockAllocationTable)
821	{
822	RTMemFree(pBlockAllocationTable);
823	return VERR_NO_MEMORY;
824	}
825
826	for (i = 0; i < pImage->cBlockAllocationTableEntries; i++)
827	pImage->pBlockAllocationTable[i] = RT_BE2H_U32(pBlockAllocationTable[i]);
828
829	RTMemFree(pBlockAllocationTable);
830
831	if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF)
832	memcpy(pImage->ParentUuid.au8, vhdDynamicDiskHeader.ParentUuid, sizeof(pImage->ParentUuid));
833
834	return rc;
835	}
836
837	static int vhdOpenImage(PVHDIMAGE pImage, unsigned uOpenFlags)
838	{
839	uint64_t FileSize;
840	VHDFooter vhdFooter; RT_ZERO(vhdFooter); /* MSVC thinks this can be used uninitialized. */
841
842	pImage->uOpenFlags = uOpenFlags;
843
844	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
845	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
846	AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
847
848	/*
849	* Open the image.
850	*/
851	int rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
852	VDOpenFlagsToFileOpenFlags(uOpenFlags,
853	false /* fCreate */),
854	&pImage->pStorage);
855	if (RT_FAILURE(rc))
856	{
857	/* Do NOT signal an appropriate error here, as the VD layer has the
858	* choice of retrying the open if it failed. */
859	return rc;
860	}
861
862	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &FileSize);
863	if (RT_SUCCESS(rc))
864	{
865	pImage->uCurrentEndOfFile = FileSize - sizeof(VHDFooter);
866
867	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile,
868	&vhdFooter, sizeof(VHDFooter));
869	if (RT_SUCCESS(rc))
870	{
871	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
872	{
873	/*
874	* There is also a backup header at the beginning in case the image got corrupted.
875	* Such corrupted images are detected here to let the open handler repair it later.
876	*/
877	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0,
878	&vhdFooter, sizeof(VHDFooter));
879	if (RT_SUCCESS(rc))
880	{
881	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
882	rc = VERR_VD_VHD_INVALID_HEADER;
883	else
884	rc = VERR_VD_IMAGE_CORRUPTED;
885	}
886	}
887	}
888	}
889
890	if (RT_FAILURE(rc))
891	{
892	vhdFreeImage(pImage, false);
893	return rc;
894	}
895
896	switch (RT_BE2H_U32(vhdFooter.DiskType))
897	{
898	case VHD_FOOTER_DISK_TYPE_FIXED:
899	pImage->uImageFlags \|= VD_IMAGE_FLAGS_FIXED;
900	break;
901	case VHD_FOOTER_DISK_TYPE_DYNAMIC:
902	pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED;
903	break;
904	case VHD_FOOTER_DISK_TYPE_DIFFERENCING:
905	pImage->uImageFlags \|= VD_IMAGE_FLAGS_DIFF;
906	pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED;
907	break;
908	default:
909	vhdFreeImage(pImage, false);
910	return VERR_NOT_IMPLEMENTED;
911	}
912
913	pImage->cbSize = RT_BE2H_U64(vhdFooter.CurSize);
914	pImage->LCHSGeometry.cCylinders = 0;
915	pImage->LCHSGeometry.cHeads = 0;
916	pImage->LCHSGeometry.cSectors = 0;
917	pImage->PCHSGeometry.cCylinders = RT_BE2H_U16(vhdFooter.DiskGeometryCylinder);
918	pImage->PCHSGeometry.cHeads = vhdFooter.DiskGeometryHeads;
919	pImage->PCHSGeometry.cSectors = vhdFooter.DiskGeometrySectors;
920
921	/*
922	* Copy of the disk footer.
923	* If we allocate new blocks in differencing disks on write access
924	* the footer is overwritten. We need to write it at the end of the file.
925	*/
926	memcpy(&pImage->vhdFooterCopy, &vhdFooter, sizeof(VHDFooter));
927
928	/*
929	* Is there a better way?
930	*/
931	memcpy(&pImage->ImageUuid, &vhdFooter.UniqueID, 16);
932
933	pImage->u64DataOffset = RT_BE2H_U64(vhdFooter.DataOffset);
934	LogFlowFunc(("DataOffset=%llu\n", pImage->u64DataOffset));
935
936	if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
937	rc = vhdLoadDynamicDisk(pImage, pImage->u64DataOffset);
938
939	if (RT_SUCCESS(rc))
940	{
941	PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
942	pImage->RegionList.fFlags = 0;
943	pImage->RegionList.cRegions = 1;
944
945	pRegion->offRegion = 0; /* Disk start. */
946	pRegion->cbBlock = 512;
947	pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
948	pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
949	pRegion->cbData = 512;
950	pRegion->cbMetadata = 0;
951	pRegion->cRegionBlocksOrBytes = pImage->cbSize;
952	}
953	else
954	vhdFreeImage(pImage, false);
955	return rc;
956	}
957
958	/**
959	* Internal: Checks if a sector in the block bitmap is set
960	*/
961	DECLINLINE(bool) vhdBlockBitmapSectorContainsData(PVHDIMAGE pImage, uint32_t cBlockBitmapEntry)
962	{
963	uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */
964
965	/*
966	* The index of the bit in the byte of the data block bitmap.
967	* The most significant bit stands for a lower sector number.
968	*/
969	uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8);
970	uint8_t *puBitmap = pImage->pu8Bitmap + iBitmap;
971
972	AssertMsg(puBitmap < (pImage->pu8Bitmap + pImage->cbDataBlockBitmap),
973	("VHD: Current bitmap position exceeds maximum size of the bitmap\n"));
974
975	return ((*puBitmap) & RT_BIT(iBitInByte)) != 0;
976	}
977
978	/**
979	* Internal: Sets the given sector in the sector bitmap.
980	*/
981	DECLINLINE(bool) vhdBlockBitmapSectorSet(PVHDIMAGE pImage, uint8_t *pu8Bitmap, uint32_t cBlockBitmapEntry)
982	{
983	RT_NOREF1(pImage);
984	uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */
985
986	/*
987	* The index of the bit in the byte of the data block bitmap.
988	* The most significant bit stands for a lower sector number.
989	*/
990	uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8);
991	uint8_t *puBitmap = pu8Bitmap + iBitmap;
992
993	AssertMsg(puBitmap < (pu8Bitmap + pImage->cbDataBlockBitmap),
994	("VHD: Current bitmap position exceeds maximum size of the bitmap\n"));
995
996	bool fClear = ((*puBitmap) & RT_BIT(iBitInByte)) == 0;
997	*puBitmap \|= RT_BIT(iBitInByte);
998	return fClear;
999	}
1000
1001	/**
1002	* Internal: Derive drive geometry from its size.
1003	*/
1004	static void vhdSetDiskGeometry(PVHDIMAGE pImage, uint64_t cbSize)
1005	{
1006	uint64_t u64TotalSectors = cbSize / VHD_SECTOR_SIZE;
1007	uint32_t u32CylinderTimesHeads, u32Heads, u32SectorsPerTrack;
1008
1009	if (u64TotalSectors > 65535 * 16 * 255)
1010	{
1011	/* ATA disks limited to 127 GB. */
1012	u64TotalSectors = 65535 * 16 * 255;
1013	}
1014
1015	if (u64TotalSectors >= 65535 * 16 * 63)
1016	{
1017	u32SectorsPerTrack = 255;
1018	u32Heads = 16;
1019	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
1020	}
1021	else
1022	{
1023	u32SectorsPerTrack = 17;
1024	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
1025
1026	u32Heads = (u32CylinderTimesHeads + 1023) / 1024;
1027
1028	if (u32Heads < 4)
1029	{
1030	u32Heads = 4;
1031	}
1032	if (u32CylinderTimesHeads >= (u32Heads * 1024) \|\| u32Heads > 16)
1033	{
1034	u32SectorsPerTrack = 31;
1035	u32Heads = 16;
1036	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
1037	}
1038	if (u32CylinderTimesHeads >= (u32Heads * 1024))
1039	{
1040	u32SectorsPerTrack = 63;
1041	u32Heads = 16;
1042	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
1043	}
1044	}
1045	pImage->PCHSGeometry.cCylinders = u32CylinderTimesHeads / u32Heads;
1046	pImage->PCHSGeometry.cHeads = u32Heads;
1047	pImage->PCHSGeometry.cSectors = u32SectorsPerTrack;
1048	pImage->LCHSGeometry.cCylinders = 0;
1049	pImage->LCHSGeometry.cHeads = 0;
1050	pImage->LCHSGeometry.cSectors = 0;
1051	}
1052
1053
1054	static uint32_t vhdAllocateParentLocators(PVHDIMAGE pImage, VHDDynamicDiskHeader *pDDH, uint64_t u64Offset)
1055	{
1056	RT_NOREF1(pImage);
1057	PVHDPLE pLocator = pDDH->ParentLocatorEntry;
1058
1059	/*
1060	* The VHD spec states that the DataSpace field holds the number of sectors
1061	* required to store the parent locator path.
1062	* As it turned out VPC and Hyper-V store the amount of bytes reserved for the
1063	* path and not the number of sectors.
1064	*/
1065
1066	/* Unicode absolute Windows path. */
1067	pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2KU);
1068	pLocator->u32DataSpace = RT_H2BE_U32(VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16));
1069	pLocator->u64DataOffset = RT_H2BE_U64(u64Offset);
1070	pLocator++;
1071	u64Offset += VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16);
1072	/* Unicode relative Windows path. */
1073	pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2RU);
1074	pLocator->u32DataSpace = RT_H2BE_U32(VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16));
1075	pLocator->u64DataOffset = RT_H2BE_U64(u64Offset);
1076	u64Offset += VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16);
1077	return u64Offset;
1078	}
1079
1080	/**
1081	* Internal: Additional code for dynamic VHD image creation.
1082	*/
1083	static int vhdCreateDynamicImage(PVHDIMAGE pImage, uint64_t cbSize)
1084	{
1085	int rc;
1086	VHDDynamicDiskHeader DynamicDiskHeader;
1087	uint32_t u32BlockAllocationTableSectors;
1088	void *pvTmp = NULL;
1089
1090	memset(&DynamicDiskHeader, 0, sizeof(DynamicDiskHeader));
1091
1092	pImage->u64DataOffset = sizeof(VHDFooter);
1093	pImage->cbDataBlock = VHD_BLOCK_SIZE; /* 2 MB */
1094	pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE;
1095	pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8;
1096	pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE;
1097	/* Align to sector boundary */
1098	if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0)
1099	pImage->cDataBlockBitmapSectors++;
1100	pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage);
1101	if (!pImage->pu8Bitmap)
1102	return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for bitmap storage"));
1103
1104	/* Initialize BAT. */
1105	pImage->uBlockAllocationTableOffset = (uint64_t)sizeof(VHDFooter) + sizeof(VHDDynamicDiskHeader);
1106	pImage->cBlockAllocationTableEntries = (uint32_t)((cbSize + pImage->cbDataBlock - 1) / pImage->cbDataBlock); /* Align table to the block size. */
1107	u32BlockAllocationTableSectors = (pImage->cBlockAllocationTableEntries * sizeof(uint32_t) + VHD_SECTOR_SIZE - 1) / VHD_SECTOR_SIZE;
1108	pImage->pBlockAllocationTable = (uint32_t )RTMemAllocZ(pImage->cBlockAllocationTableEntries sizeof(uint32_t));
1109	if (!pImage->pBlockAllocationTable)
1110	return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for BAT"));
1111
1112	for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++)
1113	{
1114	pImage->pBlockAllocationTable[i] = 0xFFFFFFFF; /* It is actually big endian. */
1115	}
1116
1117	/* Round up to the sector size. */
1118	if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF) /* fix hyper-v unreadable error */
1119	pImage->uCurrentEndOfFile = vhdAllocateParentLocators(pImage, &DynamicDiskHeader,
1120	pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE);
1121	else
1122	pImage->uCurrentEndOfFile = pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE;
1123
1124	/* Set dynamic image size. */
1125	pvTmp = RTMemTmpAllocZ(pImage->uCurrentEndOfFile + sizeof(VHDFooter));
1126	if (!pvTmp)
1127	return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
1128
1129	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, pvTmp,
1130	pImage->uCurrentEndOfFile + sizeof(VHDFooter));
1131	if (RT_FAILURE(rc))
1132	{
1133	RTMemTmpFree(pvTmp);
1134	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
1135	}
1136
1137	RTMemTmpFree(pvTmp);
1138
1139	/* Initialize and write the dynamic disk header. */
1140	memcpy(DynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, sizeof(DynamicDiskHeader.Cookie));
1141	DynamicDiskHeader.DataOffset = UINT64_C(0xFFFFFFFFFFFFFFFF); /* Initially the disk has no data. */
1142	DynamicDiskHeader.TableOffset = RT_H2BE_U64(pImage->uBlockAllocationTableOffset);
1143	DynamicDiskHeader.HeaderVersion = RT_H2BE_U32(VHD_DYNAMIC_DISK_HEADER_VERSION);
1144	DynamicDiskHeader.BlockSize = RT_H2BE_U32(pImage->cbDataBlock);
1145	DynamicDiskHeader.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries);
1146	/* Compute and update checksum. */
1147	DynamicDiskHeader.Checksum = 0;
1148	DynamicDiskHeader.Checksum = RT_H2BE_U32(vhdChecksum(&DynamicDiskHeader, sizeof(DynamicDiskHeader)));
1149
1150	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VHDFooter),
1151	&DynamicDiskHeader, sizeof(DynamicDiskHeader));
1152	if (RT_FAILURE(rc))
1153	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write dynamic disk header to image '%s'"), pImage->pszFilename);
1154
1155	/* Write BAT. */
1156	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset,
1157	pImage->pBlockAllocationTable,
1158	pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
1159	if (RT_FAILURE(rc))
1160	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write BAT to image '%s'"), pImage->pszFilename);
1161
1162	return rc;
1163	}
1164
1165	/**
1166	* Internal: The actual code for VHD image creation, both fixed and dynamic.
1167	*/
1168	static int vhdCreateImage(PVHDIMAGE pImage, uint64_t cbSize,
1169	unsigned uImageFlags, const char *pszComment,
1170	PCVDGEOMETRY pPCHSGeometry,
1171	PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
1172	unsigned uOpenFlags,
1173	PVDINTERFACEPROGRESS pIfProgress,
1174	unsigned uPercentStart, unsigned uPercentSpan)
1175	{
1176	RT_NOREF3(pszComment, pPCHSGeometry, pLCHSGeometry);
1177	VHDFooter Footer;
1178	RTTIMESPEC now;
1179
1180	pImage->uOpenFlags = uOpenFlags;
1181	pImage->uImageFlags = uImageFlags;
1182	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
1183
1184	int rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
1185	VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY,
1186	true /* fCreate */),
1187	&pImage->pStorage);
1188	if (RT_SUCCESS(rc))
1189	{
1190	pImage->cbSize = cbSize;
1191	pImage->ImageUuid = *pUuid;
1192	RTUuidClear(&pImage->ParentUuid);
1193	vhdSetDiskGeometry(pImage, cbSize);
1194
1195	/* Initialize the footer. */
1196	memset(&Footer, 0, sizeof(Footer));
1197	memcpy(Footer.Cookie, VHD_FOOTER_COOKIE, sizeof(Footer.Cookie));
1198	Footer.Features = RT_H2BE_U32(0x2);
1199	Footer.Version = RT_H2BE_U32(VHD_FOOTER_FILE_FORMAT_VERSION);
1200	Footer.Timestamp = RT_H2BE_U32(vhdRtTime2VhdTime(RTTimeNow(&now)));
1201	memcpy(Footer.CreatorApp, "vbox", sizeof(Footer.CreatorApp));
1202	Footer.CreatorVer = RT_H2BE_U32(VBOX_VERSION);
1203	#ifdef RT_OS_DARWIN
1204	Footer.CreatorOS = RT_H2BE_U32(0x4D616320); /* "Mac " */
1205	#else /* Virtual PC supports only two platforms atm, so everything else will be Wi2k. */
1206	Footer.CreatorOS = RT_H2BE_U32(0x5769326B); /* "Wi2k" */
1207	#endif
1208	Footer.OrigSize = RT_H2BE_U64(cbSize);
1209	Footer.CurSize = Footer.OrigSize;
1210	Footer.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders);
1211	Footer.DiskGeometryHeads = pImage->PCHSGeometry.cHeads;
1212	Footer.DiskGeometrySectors = pImage->PCHSGeometry.cSectors;
1213	memcpy(Footer.UniqueID, pImage->ImageUuid.au8, sizeof(Footer.UniqueID));
1214	Footer.SavedState = 0;
1215
1216	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
1217	{
1218	Footer.DiskType = RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_FIXED);
1219	/*
1220	* Initialize fixed image.
1221	* "The size of the entire file is the size of the hard disk in
1222	* the guest operating system plus the size of the footer."
1223	*/
1224	pImage->u64DataOffset = VHD_FOOTER_DATA_OFFSET_FIXED;
1225	pImage->uCurrentEndOfFile = cbSize;
1226	rc = vdIfIoIntFileSetAllocationSize(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile + sizeof(VHDFooter),
1227	0 /* fFlags */, pIfProgress,
1228	uPercentStart, uPercentSpan);
1229	if (RT_FAILURE(rc))
1230	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
1231	}
1232	else
1233	{
1234	/*
1235	* Initialize dynamic image.
1236	*
1237	* The overall structure of dynamic disk is:
1238	*
1239	* [Copy of hard disk footer (512 bytes)]
1240	* [Dynamic disk header (1024 bytes)]
1241	* [BAT (Block Allocation Table)]
1242	* [Parent Locators]
1243	* [Data block 1]
1244	* [Data block 2]
1245	* ...
1246	* [Data block N]
1247	* [Hard disk footer (512 bytes)]
1248	*/
1249	Footer.DiskType = (uImageFlags & VD_IMAGE_FLAGS_DIFF)
1250	? RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DIFFERENCING)
1251	: RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DYNAMIC);
1252	/* We are half way thorough with creation of image, let the caller know. */
1253	vdIfProgress(pIfProgress, (uPercentStart + uPercentSpan) / 2);
1254
1255	rc = vhdCreateDynamicImage(pImage, cbSize);
1256	}
1257
1258	if (RT_SUCCESS(rc))
1259	{
1260	/* Compute and update the footer checksum. */
1261	Footer.DataOffset = RT_H2BE_U64(pImage->u64DataOffset);
1262	Footer.Checksum = 0;
1263	Footer.Checksum = RT_H2BE_U32(vhdChecksum(&Footer, sizeof(Footer)));
1264
1265	pImage->vhdFooterCopy = Footer;
1266
1267	/* Store the footer */
1268	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile,
1269	&Footer, sizeof(Footer));
1270	if (RT_SUCCESS(rc))
1271	{
1272	/* Dynamic images contain a copy of the footer at the very beginning of the file. */
1273	if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
1274	{
1275	/* Write the copy of the footer. */
1276	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Footer, sizeof(Footer));
1277	if (RT_FAILURE(rc))
1278	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write a copy of footer to image '%s'"), pImage->pszFilename);
1279	}
1280	}
1281	else
1282	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write footer to image '%s'"), pImage->pszFilename);
1283	}
1284	}
1285	else
1286	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot create image '%s'"), pImage->pszFilename);
1287
1288	if (RT_SUCCESS(rc))
1289	vdIfProgress(pIfProgress, uPercentStart + uPercentSpan);
1290
1291	if (RT_SUCCESS(rc))
1292	{
1293	PVDREGIONDESC pRegion = &pImage->RegionList.aRegions[0];
1294	pImage->RegionList.fFlags = 0;
1295	pImage->RegionList.cRegions = 1;
1296
1297	pRegion->offRegion = 0; /* Disk start. */
1298	pRegion->cbBlock = 512;
1299	pRegion->enmDataForm = VDREGIONDATAFORM_RAW;
1300	pRegion->enmMetadataForm = VDREGIONMETADATAFORM_NONE;
1301	pRegion->cbData = 512;
1302	pRegion->cbMetadata = 0;
1303	pRegion->cRegionBlocksOrBytes = pImage->cbSize;
1304	}
1305	else
1306	vhdFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
1307	return rc;
1308	}
1309
1310
1311	/** @interface_method_impl{VDIMAGEBACKEND,pfnProbe} */
1312	static DECLCALLBACK(int) vhdProbe(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1313	PVDINTERFACE pVDIfsImage, VDTYPE enmDesiredType, VDTYPE *penmType)
1314	{
1315	RT_NOREF(pVDIfsDisk, enmDesiredType);
1316	LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
1317	PVDIOSTORAGE pStorage;
1318	PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage);
1319	AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
1320
1321	int rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
1322	VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY,
1323	false /* fCreate */),
1324	&pStorage);
1325	if (RT_SUCCESS(rc))
1326	{
1327	uint64_t cbFile;
1328
1329	rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
1330	if ( RT_SUCCESS(rc)
1331	&& cbFile >= sizeof(VHDFooter))
1332	{
1333	VHDFooter vhdFooter;
1334
1335	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter),
1336	&vhdFooter, sizeof(VHDFooter));
1337	if (RT_SUCCESS(rc))
1338	{
1339	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
1340	{
1341	/*
1342	* There is also a backup header at the beginning in case the image got corrupted.
1343	* Such corrupted images are detected here to let the open handler repair it later.
1344	*/
1345	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &vhdFooter, sizeof(VHDFooter));
1346	if ( RT_FAILURE(rc)
1347	\|\| (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0))
1348	rc = VERR_VD_VHD_INVALID_HEADER;
1349	}
1350
1351	if (RT_SUCCESS(rc))
1352	*penmType = VDTYPE_HDD;
1353	}
1354	else
1355	rc = VERR_VD_VHD_INVALID_HEADER;
1356	}
1357	else if (RT_SUCCESS(rc))
1358	rc = VERR_VD_VHD_INVALID_HEADER;
1359
1360	vdIfIoIntFileClose(pIfIo, pStorage);
1361	}
1362
1363	LogFlowFunc(("returns %Rrc\n", rc));
1364	return rc;
1365	}
1366
1367	/** @interface_method_impl{VDIMAGEBACKEND,pfnOpen} */
1368	static DECLCALLBACK(int) vhdOpen(const char *pszFilename, unsigned uOpenFlags,
1369	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1370	VDTYPE enmType, void **ppBackendData)
1371	{
1372	RT_NOREF1(enmType); /*< @todo r=klaus make use of the type info. /
1373
1374	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n",
1375	pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
1376	int rc = VINF_SUCCESS;
1377
1378	/* Check open flags. All valid flags are supported. */
1379	AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
1380	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
1381	AssertReturn(*pszFilename != '\0', VERR_INVALID_PARAMETER);
1382
1383
1384	PVHDIMAGE pImage = (PVHDIMAGE)RTMemAllocZ(RT_UOFFSETOF(VHDIMAGE, RegionList.aRegions[1]));
1385	if (RT_LIKELY(pImage))
1386	{
1387	pImage->pszFilename = pszFilename;
1388	pImage->pStorage = NULL;
1389	pImage->pVDIfsDisk = pVDIfsDisk;
1390	pImage->pVDIfsImage = pVDIfsImage;
1391
1392	rc = vhdOpenImage(pImage, uOpenFlags);
1393	if (RT_SUCCESS(rc))
1394	*ppBackendData = pImage;
1395	else
1396	RTMemFree(pImage);
1397	}
1398	else
1399	rc = VERR_NO_MEMORY;
1400
1401	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1402	return rc;
1403	}
1404
1405	/** @interface_method_impl{VDIMAGEBACKEND,pfnCreate} */
1406	static DECLCALLBACK(int) vhdCreate(const char *pszFilename, uint64_t cbSize,
1407	unsigned uImageFlags, const char *pszComment,
1408	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1409	PCRTUUID pUuid, unsigned uOpenFlags,
1410	unsigned uPercentStart, unsigned uPercentSpan,
1411	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1412	PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
1413	void **ppBackendData)
1414	{
1415	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 enmType=%u ppBackendData=%#p",
1416	pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
1417	int rc;
1418	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
1419
1420	/* Check the VD container type. */
1421	if (enmType != VDTYPE_HDD)
1422	return VERR_VD_INVALID_TYPE;
1423
1424	/* Check open flags. All valid flags are supported. */
1425	AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
1426	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
1427	AssertReturn(*pszFilename != '\0', VERR_INVALID_PARAMETER);
1428	AssertPtrReturn(pPCHSGeometry, VERR_INVALID_POINTER);
1429	AssertPtrReturn(pLCHSGeometry, VERR_INVALID_POINTER);
1430	/** @todo Check the values of other params */
1431
1432	PVHDIMAGE pImage = (PVHDIMAGE)RTMemAllocZ(RT_UOFFSETOF(VHDIMAGE, RegionList.aRegions[1]));
1433	if (RT_LIKELY(pImage))
1434	{
1435	pImage->pszFilename = pszFilename;
1436	pImage->pStorage = NULL;
1437	pImage->pVDIfsDisk = pVDIfsDisk;
1438	pImage->pVDIfsImage = pVDIfsImage;
1439
1440	/* Get I/O interface. */
1441	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
1442	if (RT_LIKELY(RT_VALID_PTR(pImage->pIfIo)))
1443	{
1444	rc = vhdCreateImage(pImage, cbSize, uImageFlags, pszComment,
1445	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1446	pIfProgress, uPercentStart, uPercentSpan);
1447	if (RT_SUCCESS(rc))
1448	{
1449	/* So far the image is opened in read/write mode. Make sure the
1450	* image is opened in read-only mode if the caller requested that. */
1451	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1452	{
1453	vhdFreeImage(pImage, false);
1454	rc = vhdOpenImage(pImage, uOpenFlags);
1455	}
1456
1457	if (RT_SUCCESS(rc))
1458	*ppBackendData = pImage;
1459	}
1460	}
1461	else
1462	rc = VERR_INVALID_PARAMETER;
1463
1464	if (RT_FAILURE(rc))
1465	RTMemFree(pImage);
1466	}
1467	else
1468	rc = VERR_NO_MEMORY;
1469
1470	LogFlowFunc(("returns %Rrc\n", rc));
1471	return rc;
1472	}
1473
1474	/** @interface_method_impl{VDIMAGEBACKEND,pfnRename} */
1475	static DECLCALLBACK(int) vhdRename(void pBackendData, const char pszFilename)
1476	{
1477	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1478	int rc = VINF_SUCCESS;
1479	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1480
1481	/* Check arguments. */
1482	AssertReturn((pImage && pszFilename && *pszFilename), VERR_INVALID_PARAMETER);
1483
1484	/* Close the image. */
1485	rc = vhdFreeImage(pImage, false);
1486	if (RT_SUCCESS(rc))
1487	{
1488	/* Rename the file. */
1489	rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
1490	if (RT_SUCCESS(rc))
1491	{
1492	/* Update pImage with the new information. */
1493	pImage->pszFilename = pszFilename;
1494
1495	/* Open the old file with new name. */
1496	rc = vhdOpenImage(pImage, pImage->uOpenFlags);
1497	}
1498	else
1499	{
1500	/* The move failed, try to reopen the original image. */
1501	int rc2 = vhdOpenImage(pImage, pImage->uOpenFlags);
1502	if (RT_FAILURE(rc2))
1503	rc = rc2;
1504	}
1505	}
1506
1507	LogFlowFunc(("returns %Rrc\n", rc));
1508	return rc;
1509	}
1510
1511	/** @interface_method_impl{VDIMAGEBACKEND,pfnClose} */
1512	static DECLCALLBACK(int) vhdClose(void *pBackendData, bool fDelete)
1513	{
1514	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1515	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1516
1517	int rc = vhdFreeImage(pImage, fDelete);
1518	RTMemFree(pImage);
1519
1520	LogFlowFunc(("returns %Rrc\n", rc));
1521	return rc;
1522	}
1523
1524	/** @interface_method_impl{VDIMAGEBACKEND,pfnRead} */
1525	static DECLCALLBACK(int) vhdRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
1526	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
1527	{
1528	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1529	int rc = VINF_SUCCESS;
1530
1531	LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbToRead=%u pcbActuallyRead=%p\n",
1532	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
1533
1534	AssertPtr(pImage);
1535	Assert(uOffset % 512 == 0);
1536	Assert(cbToRead % 512 == 0);
1537	AssertPtrReturn(pIoCtx, VERR_INVALID_POINTER);
1538	AssertReturn(cbToRead, VERR_INVALID_PARAMETER);
1539	AssertReturn(uOffset + cbToRead <= pImage->cbSize, VERR_INVALID_PARAMETER);
1540
1541	/*
1542	* If we have a dynamic disk image, we need to find the data block and sector to read.
1543	*/
1544	if (pImage->pBlockAllocationTable)
1545	{
1546	/*
1547	* Get the data block first.
1548	*/
1549	uint32_t cBlockAllocationTableEntry = (uOffset / VHD_SECTOR_SIZE) / pImage->cSectorsPerDataBlock;
1550	uint32_t cBATEntryIndex = (uOffset / VHD_SECTOR_SIZE) % pImage->cSectorsPerDataBlock;
1551	uint64_t uVhdOffset;
1552
1553	LogFlowFunc(("cBlockAllocationTableEntry=%u cBatEntryIndex=%u\n", cBlockAllocationTableEntry, cBATEntryIndex));
1554	LogFlowFunc(("BlockAllocationEntry=%u\n", pImage->pBlockAllocationTable[cBlockAllocationTableEntry]));
1555
1556	/*
1557	* Clip read range to remain in this data block.
1558	*/
1559	cbToRead = RT_MIN(cbToRead, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE)));
1560
1561	/*
1562	* If the block is not allocated the content of the entry is ~0
1563	*/
1564	if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U)
1565	rc = VERR_VD_BLOCK_FREE;
1566	else
1567	{
1568	uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE;
1569	LogFlowFunc(("uVhdOffset=%llu cbToRead=%u\n", uVhdOffset, cbToRead));
1570
1571	/* Read in the block's bitmap. */
1572	PVDMETAXFER pMetaXfer;
1573	rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
1574	((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
1575	pImage->pu8Bitmap, pImage->cbDataBlockBitmap,
1576	pIoCtx, &pMetaXfer, NULL, NULL);
1577
1578	if (RT_SUCCESS(rc))
1579	{
1580	uint32_t cSectors = 0;
1581
1582	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
1583	if (vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
1584	{
1585	cBATEntryIndex++;
1586	cSectors = 1;
1587
1588	/*
1589	* The first sector being read is marked dirty, read as much as we
1590	* can from child. Note that only sectors that are marked dirty
1591	* must be read from child.
1592	*/
1593	while ( (cSectors < (cbToRead / VHD_SECTOR_SIZE))
1594	&& vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
1595	{
1596	cBATEntryIndex++;
1597	cSectors++;
1598	}
1599
1600	cbToRead = cSectors * VHD_SECTOR_SIZE;
1601
1602	LogFlowFunc(("uVhdOffset=%llu cbToRead=%u\n", uVhdOffset, cbToRead));
1603	rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage,
1604	uVhdOffset, pIoCtx, cbToRead);
1605	}
1606	else
1607	{
1608	/*
1609	* The first sector being read is marked clean, so we should read from
1610	* our parent instead, but only as much as there are the following
1611	* clean sectors, because the block may still contain dirty sectors
1612	* further on. We just need to compute the number of clean sectors
1613	* and pass it to our caller along with the notification that they
1614	* should be read from the parent.
1615	*/
1616	cBATEntryIndex++;
1617	cSectors = 1;
1618
1619	while ( (cSectors < (cbToRead / VHD_SECTOR_SIZE))
1620	&& !vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
1621	{
1622	cBATEntryIndex++;
1623	cSectors++;
1624	}
1625
1626	cbToRead = cSectors * VHD_SECTOR_SIZE;
1627	LogFunc(("Sectors free: uVhdOffset=%llu cbToRead=%u\n", uVhdOffset, cbToRead));
1628	rc = VERR_VD_BLOCK_FREE;
1629	}
1630	}
1631	else
1632	AssertMsg(rc == VERR_VD_NOT_ENOUGH_METADATA, ("Reading block bitmap failed rc=%Rrc\n", rc));
1633	}
1634	}
1635	else
1636	rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, uOffset, pIoCtx, cbToRead);
1637
1638	if (pcbActuallyRead)
1639	*pcbActuallyRead = cbToRead;
1640
1641	LogFlowFunc(("returns rc=%Rrc\n", rc));
1642	return rc;
1643	}
1644
1645	/** @interface_method_impl{VDIMAGEBACKEND,pfnWrite} */
1646	static DECLCALLBACK(int) vhdWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
1647	PVDIOCTX pIoCtx, size_t pcbWriteProcess, size_t pcbPreRead,
1648	size_t *pcbPostRead, unsigned fWrite)
1649	{
1650	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1651	int rc = VINF_SUCCESS;
1652
1653	LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbToWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
1654	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
1655
1656	AssertPtr(pImage);
1657	Assert(!(uOffset % VHD_SECTOR_SIZE));
1658	Assert(!(cbToWrite % VHD_SECTOR_SIZE));
1659	AssertPtrReturn(pIoCtx, VERR_INVALID_POINTER);
1660	AssertReturn(cbToWrite, VERR_INVALID_PARAMETER);
1661	AssertReturn(uOffset + cbToWrite <= RT_ALIGN_64(pImage->cbSize, pImage->cbDataBlock), VERR_INVALID_PARAMETER); /* The image size might not be on a data block size boundary. */
1662
1663	if (pImage->pBlockAllocationTable)
1664	{
1665	/*
1666	* Get the data block first.
1667	*/
1668	uint32_t cSector = uOffset / VHD_SECTOR_SIZE;
1669	uint32_t cBlockAllocationTableEntry = cSector / pImage->cSectorsPerDataBlock;
1670	uint32_t cBATEntryIndex = cSector % pImage->cSectorsPerDataBlock;
1671	uint64_t uVhdOffset;
1672
1673	/*
1674	* Clip write range.
1675	*/
1676	cbToWrite = RT_MIN(cbToWrite, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE)));
1677
1678	/*
1679	* If the block is not allocated the content of the entry is ~0
1680	* and we need to allocate a new block. Note that while blocks are
1681	* allocated with a relatively big granularity, each sector has its
1682	* own bitmap entry, indicating whether it has been written or not.
1683	* So that means for the purposes of the higher level that the
1684	* granularity is invisible. This means there's no need to return
1685	* VERR_VD_BLOCK_FREE unless the block hasn't been allocated yet.
1686	*/
1687	if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U)
1688	{
1689	/* Check if the block allocation should be suppressed. */
1690	if ( (fWrite & VD_WRITE_NO_ALLOC)
1691	\|\| (cbToWrite != pImage->cbDataBlock))
1692	{
1693	pcbPreRead = cBATEntryIndex VHD_SECTOR_SIZE;
1694	pcbPostRead = pImage->cSectorsPerDataBlock VHD_SECTOR_SIZE - cbToWrite - *pcbPreRead;
1695
1696	if (pcbWriteProcess)
1697	*pcbWriteProcess = cbToWrite;
1698	return VERR_VD_BLOCK_FREE;
1699	}
1700
1701	PVHDIMAGEEXPAND pExpand;
1702	pExpand = (PVHDIMAGEEXPAND)RTMemAllocZ(RT_UOFFSETOF_DYN(VHDIMAGEEXPAND,
1703	au8Bitmap[pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE]));
1704	bool fIoInProgress = false;
1705
1706	if (!pExpand)
1707	return VERR_NO_MEMORY;
1708
1709	pExpand->cbEofOld = pImage->uCurrentEndOfFile;
1710	pExpand->idxBatAllocated = cBlockAllocationTableEntry;
1711	pExpand->idxBlockBe = RT_H2BE_U32(pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE);
1712
1713	/* Set the bits for all sectors having been written. */
1714	for (uint32_t iSector = 0; iSector < (cbToWrite / VHD_SECTOR_SIZE); iSector++)
1715	{
1716	/* No need to check for a changed value because this is an initial write. */
1717	vhdBlockBitmapSectorSet(pImage, pExpand->au8Bitmap, cBATEntryIndex);
1718	cBATEntryIndex++;
1719	}
1720
1721	do
1722	{
1723	/*
1724	* Start with the sector bitmap.
1725	*/
1726	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1727	pImage->uCurrentEndOfFile,
1728	pExpand->au8Bitmap,
1729	pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE, pIoCtx,
1730	vhdAsyncExpansionDataBlockBitmapComplete,
1731	pExpand);
1732	if (RT_SUCCESS(rc))
1733	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1734	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1735	fIoInProgress = true;
1736	else
1737	{
1738	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1739	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1740	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1741	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1742	break;
1743	}
1744
1745
1746	/*
1747	* Write the new block at the current end of the file.
1748	*/
1749	rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1750	pImage->uCurrentEndOfFile + (pImage->cDataBlockBitmapSectors + (cSector % pImage->cSectorsPerDataBlock)) * VHD_SECTOR_SIZE,
1751	pIoCtx, cbToWrite,
1752	vhdAsyncExpansionDataComplete,
1753	pExpand);
1754	if (RT_SUCCESS(rc))
1755	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1756	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1757	fIoInProgress = true;
1758	else
1759	{
1760	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1761	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1762	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1763	break;
1764	}
1765
1766	/*
1767	* Write entry in the BAT.
1768	*/
1769	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1770	pImage->uBlockAllocationTableOffset + cBlockAllocationTableEntry * sizeof(uint32_t),
1771	&pExpand->idxBlockBe, sizeof(uint32_t), pIoCtx,
1772	vhdAsyncExpansionBatUpdateComplete,
1773	pExpand);
1774	if (RT_SUCCESS(rc))
1775	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1776	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1777	fIoInProgress = true;
1778	else
1779	{
1780	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1781	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1782	break;
1783	}
1784
1785	/*
1786	* Set the new end of the file and link the new block into the BAT.
1787	*/
1788	pImage->uCurrentEndOfFile += pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE + pImage->cbDataBlock;
1789
1790	/* Update the footer. */
1791	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1792	pImage->uCurrentEndOfFile,
1793	&pImage->vhdFooterCopy,
1794	sizeof(VHDFooter), pIoCtx,
1795	vhdAsyncExpansionFooterUpdateComplete,
1796	pExpand);
1797	if (RT_SUCCESS(rc))
1798	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1799	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1800	fIoInProgress = true;
1801	else
1802	{
1803	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1804	break;
1805	}
1806
1807	} while (0);
1808
1809	if (!fIoInProgress)
1810	vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand);
1811	else
1812	rc = VERR_VD_ASYNC_IO_IN_PROGRESS;
1813	}
1814	else
1815	{
1816	/*
1817	* Calculate the real offset in the file.
1818	*/
1819	uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE;
1820
1821	/* Read in the block's bitmap. */
1822	PVDMETAXFER pMetaXfer;
1823	rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
1824	((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
1825	pImage->pu8Bitmap,
1826	pImage->cbDataBlockBitmap, pIoCtx,
1827	&pMetaXfer, NULL, NULL);
1828	if (RT_SUCCESS(rc))
1829	{
1830	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
1831
1832	/* Write data. */
1833	rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1834	uVhdOffset, pIoCtx, cbToWrite,
1835	NULL, NULL);
1836	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1837	{
1838	bool fChanged = false;
1839
1840	/* Set the bits for all sectors having been written. */
1841	for (uint32_t iSector = 0; iSector < (cbToWrite / VHD_SECTOR_SIZE); iSector++)
1842	{
1843	fChanged \|= vhdBlockBitmapSectorSet(pImage, pImage->pu8Bitmap, cBATEntryIndex);
1844	cBATEntryIndex++;
1845	}
1846
1847	/* Only write the bitmap if it was changed. */
1848	if (fChanged)
1849	{
1850	/*
1851	* Write the bitmap back.
1852	*
1853	* @note We don't have a completion callback here because we
1854	* can't do anything if the write fails for some reason.
1855	* The error will propagated to the device/guest
1856	* by the generic VD layer already and we don't need
1857	* to rollback anything here.
1858	*/
1859	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1860	((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
1861	pImage->pu8Bitmap,
1862	pImage->cbDataBlockBitmap,
1863	pIoCtx, NULL, NULL);
1864	}
1865	}
1866	}
1867	}
1868	}
1869	else
1870	rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1871	uOffset, pIoCtx, cbToWrite, NULL, NULL);
1872
1873	if (pcbWriteProcess)
1874	*pcbWriteProcess = cbToWrite;
1875
1876	/* Stay on the safe side. Do not run the risk of confusing the higher
1877	* level, as that can be pretty lethal to image consistency. */
1878	*pcbPreRead = 0;
1879	*pcbPostRead = 0;
1880
1881	return rc;
1882	}
1883
1884	/** @interface_method_impl{VDIMAGEBACKEND,pfnFlush} */
1885	static DECLCALLBACK(int) vhdFlush(void *pBackendData, PVDIOCTX pIoCtx)
1886	{
1887	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1888	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1889
1890	/* No need to write anything here. Data is always updated on a write. */
1891	int rc = vdIfIoIntFileFlush(pImage->pIfIo, pImage->pStorage, pIoCtx, NULL, NULL);
1892	LogFlowFunc(("returns %Rrc\n", rc));
1893	return rc;
1894	}
1895
1896	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetVersion} */
1897	static DECLCALLBACK(unsigned) vhdGetVersion(void *pBackendData)
1898	{
1899	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1900	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1901
1902	AssertPtrReturn(pImage, 0);
1903
1904	unsigned uVersion = 1; /*< @todo use correct version /
1905
1906	LogFlowFunc(("returns %u\n", uVersion));
1907	return uVersion;
1908	}
1909
1910	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetFileSize} */
1911	static DECLCALLBACK(uint64_t) vhdGetFileSize(void *pBackendData)
1912	{
1913	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1914	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1915	uint64_t cb = 0;
1916
1917	AssertPtrReturn(pImage, 0);
1918
1919	if (pImage->pStorage)
1920	cb = pImage->uCurrentEndOfFile + sizeof(VHDFooter);
1921
1922	LogFlowFunc(("returns %lld\n", cb));
1923	return cb;
1924	}
1925
1926	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetPCHSGeometry} */
1927	static DECLCALLBACK(int) vhdGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1928	{
1929	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1930	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1931	int rc = VINF_SUCCESS;
1932
1933	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
1934
1935	if (pImage->PCHSGeometry.cCylinders)
1936	*pPCHSGeometry = pImage->PCHSGeometry;
1937	else
1938	rc = VERR_VD_GEOMETRY_NOT_SET;
1939
1940	LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->PCHSGeometry.cCylinders,
1941	pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors));
1942	return rc;
1943	}
1944
1945	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetPCHSGeometry} */
1946	static DECLCALLBACK(int) vhdSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1947	{
1948	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n",
1949	pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1950	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1951	int rc = VINF_SUCCESS;
1952
1953	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
1954
1955	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1956	rc = VERR_VD_IMAGE_READ_ONLY;
1957	else
1958	pImage->PCHSGeometry = *pPCHSGeometry;
1959
1960	LogFlowFunc(("returns %Rrc\n", rc));
1961	return rc;
1962	}
1963
1964	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetLCHSGeometry} */
1965	static DECLCALLBACK(int) vhdGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1966	{
1967	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1968	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1969	int rc = VINF_SUCCESS;
1970
1971	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
1972
1973	if (pImage->LCHSGeometry.cCylinders)
1974	*pLCHSGeometry = pImage->LCHSGeometry;
1975	else
1976	rc = VERR_VD_GEOMETRY_NOT_SET;
1977
1978	LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->LCHSGeometry.cCylinders,
1979	pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors));
1980	return rc;
1981	}
1982
1983	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetLCHSGeometry} */
1984	static DECLCALLBACK(int) vhdSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1985	{
1986	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1987	int rc = VINF_SUCCESS;
1988
1989	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
1990
1991	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1992	rc = VERR_VD_IMAGE_READ_ONLY;
1993	else
1994	pImage->LCHSGeometry = *pLCHSGeometry;
1995
1996	LogFlowFunc(("returns %Rrc\n", rc));
1997	return rc;
1998	}
1999
2000	/** @copydoc VDIMAGEBACKEND::pfnQueryRegions */
2001	static DECLCALLBACK(int) vhdQueryRegions(void pBackendData, PCVDREGIONLIST ppRegionList)
2002	{
2003	LogFlowFunc(("pBackendData=%#p ppRegionList=%#p\n", pBackendData, ppRegionList));
2004	PVHDIMAGE pThis = (PVHDIMAGE)pBackendData;
2005
2006	AssertPtrReturn(pThis, VERR_VD_NOT_OPENED);
2007
2008	*ppRegionList = &pThis->RegionList;
2009	LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
2010	return VINF_SUCCESS;
2011	}
2012
2013	/** @copydoc VDIMAGEBACKEND::pfnRegionListRelease */
2014	static DECLCALLBACK(void) vhdRegionListRelease(void *pBackendData, PCVDREGIONLIST pRegionList)
2015	{
2016	RT_NOREF1(pRegionList);
2017	LogFlowFunc(("pBackendData=%#p pRegionList=%#p\n", pBackendData, pRegionList));
2018	PVHDIMAGE pThis = (PVHDIMAGE)pBackendData;
2019	AssertPtr(pThis); RT_NOREF(pThis);
2020
2021	/* Nothing to do here. */
2022	}
2023
2024	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetImageFlags} */
2025	static DECLCALLBACK(unsigned) vhdGetImageFlags(void *pBackendData)
2026	{
2027	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2028	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2029
2030	AssertPtrReturn(pImage, 0);
2031
2032	LogFlowFunc(("returns %#x\n", pImage->uImageFlags));
2033	return pImage->uImageFlags;
2034	}
2035
2036	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetOpenFlags} */
2037	static DECLCALLBACK(unsigned) vhdGetOpenFlags(void *pBackendData)
2038	{
2039	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2040	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2041
2042	AssertPtrReturn(pImage, 0);
2043
2044	LogFlowFunc(("returns %#x\n", pImage->uOpenFlags));
2045	return pImage->uOpenFlags;
2046	}
2047
2048	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetOpenFlags} */
2049	static DECLCALLBACK(int) vhdSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
2050	{
2051	LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
2052	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2053	int rc = VINF_SUCCESS;
2054
2055	/* Image must be opened and the new flags must be valid. */
2056	if (!pImage \|\| (uOpenFlags & ~( VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO
2057	\| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE
2058	\| VD_OPEN_FLAGS_SEQUENTIAL \| VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)))
2059	rc = VERR_INVALID_PARAMETER;
2060	else
2061	{
2062	/* Implement this operation via reopening the image. */
2063	rc = vhdFreeImage(pImage, false);
2064	if (RT_SUCCESS(rc))
2065	rc = vhdOpenImage(pImage, uOpenFlags);
2066	}
2067
2068	LogFlowFunc(("returns %Rrc\n", rc));
2069	return rc;
2070	}
2071
2072	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetComment} */
2073	static DECLCALLBACK(int) vhdGetComment(void pBackendData, char pszComment,
2074	size_t cbComment)
2075	{
2076	RT_NOREF2(pszComment, cbComment);
2077	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
2078	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2079
2080	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2081
2082	LogFlowFunc(("returns %Rrc comment='%s'\n", VERR_NOT_SUPPORTED, pszComment));
2083	return VERR_NOT_SUPPORTED;
2084	}
2085
2086	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetComment} */
2087	static DECLCALLBACK(int) vhdSetComment(void pBackendData, const char pszComment)
2088	{
2089	RT_NOREF1(pszComment);
2090	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
2091	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2092
2093	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2094
2095	int rc;
2096	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2097	rc = VERR_VD_IMAGE_READ_ONLY;
2098	else
2099	rc = VERR_NOT_SUPPORTED;
2100
2101	LogFlowFunc(("returns %Rrc\n", rc));
2102	return rc;
2103	}
2104
2105	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetUuid} */
2106	static DECLCALLBACK(int) vhdGetUuid(void *pBackendData, PRTUUID pUuid)
2107	{
2108	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2109	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2110
2111	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2112
2113	*pUuid = pImage->ImageUuid;
2114
2115	LogFlowFunc(("returns %Rrc (%RTuuid)\n", VINF_SUCCESS, pUuid));
2116	return VINF_SUCCESS;
2117	}
2118
2119	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetUuid} */
2120	static DECLCALLBACK(int) vhdSetUuid(void *pBackendData, PCRTUUID pUuid)
2121	{
2122	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2123	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2124	int rc = VINF_SUCCESS;
2125
2126	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2127
2128	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2129	{
2130	pImage->ImageUuid = *pUuid;
2131	/* Update the footer copy. It will get written to disk when the image is closed. */
2132	memcpy(&pImage->vhdFooterCopy.UniqueID, pUuid, 16);
2133	/* Update checksum. */
2134	pImage->vhdFooterCopy.Checksum = 0;
2135	pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter)));
2136
2137	/* Need to update the dynamic disk header to update the disk footer copy at the beginning. */
2138	if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
2139	pImage->fDynHdrNeedsUpdate = true;
2140	}
2141	else
2142	rc = VERR_VD_IMAGE_READ_ONLY;
2143
2144	LogFlowFunc(("returns %Rrc\n", rc));
2145	return rc;
2146	}
2147
2148	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetModificationUuid} */
2149	static DECLCALLBACK(int) vhdGetModificationUuid(void *pBackendData, PRTUUID pUuid)
2150	{
2151	RT_NOREF1(pUuid);
2152	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2153	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2154
2155	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2156
2157	LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
2158	return VERR_NOT_SUPPORTED;
2159	}
2160
2161	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetModificationUuid} */
2162	static DECLCALLBACK(int) vhdSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
2163	{
2164	RT_NOREF1(pUuid);
2165	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2166	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2167
2168	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2169
2170	int rc;
2171	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2172	rc = VERR_VD_IMAGE_READ_ONLY;
2173	else
2174	rc = VERR_NOT_SUPPORTED;
2175
2176	LogFlowFunc(("returns %Rrc\n", rc));
2177	return rc;
2178	}
2179
2180	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentUuid} */
2181	static DECLCALLBACK(int) vhdGetParentUuid(void *pBackendData, PRTUUID pUuid)
2182	{
2183	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2184	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2185
2186	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2187
2188	*pUuid = pImage->ParentUuid;
2189
2190	LogFlowFunc(("returns %Rrc (%RTuuid)\n", VINF_SUCCESS, pUuid));
2191	return VINF_SUCCESS;
2192	}
2193
2194	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentUuid} */
2195	static DECLCALLBACK(int) vhdSetParentUuid(void *pBackendData, PCRTUUID pUuid)
2196	{
2197	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2198	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2199	int rc = VINF_SUCCESS;
2200
2201	if (pImage && pImage->pStorage)
2202	{
2203	if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
2204	{
2205	pImage->ParentUuid = *pUuid;
2206	pImage->fDynHdrNeedsUpdate = true;
2207	}
2208	else
2209	rc = VERR_VD_IMAGE_READ_ONLY;
2210	}
2211	else
2212	rc = VERR_VD_NOT_OPENED;
2213
2214	LogFlowFunc(("returns %Rrc\n", rc));
2215	return rc;
2216	}
2217
2218	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentModificationUuid} */
2219	static DECLCALLBACK(int) vhdGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
2220	{
2221	RT_NOREF1(pUuid);
2222	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2223	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2224
2225	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2226
2227	LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
2228	return VERR_NOT_SUPPORTED;
2229	}
2230
2231	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentModificationUuid} */
2232	static DECLCALLBACK(int) vhdSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
2233	{
2234	RT_NOREF1(pUuid);
2235	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2236	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2237
2238	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2239
2240	int rc;
2241	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2242	rc = VERR_VD_IMAGE_READ_ONLY;
2243	else
2244	rc = VERR_NOT_SUPPORTED;
2245
2246	LogFlowFunc(("returns %Rrc\n", rc));
2247	return rc;
2248	}
2249
2250	/** @interface_method_impl{VDIMAGEBACKEND,pfnDump} */
2251	static DECLCALLBACK(void) vhdDump(void *pBackendData)
2252	{
2253	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2254
2255	AssertPtrReturnVoid(pImage);
2256	vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%u\n",
2257	pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors,
2258	pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors,
2259	VHD_SECTOR_SIZE);
2260	vdIfErrorMessage(pImage->pIfError, "Header: uuidCreation={%RTuuid}\n", &pImage->ImageUuid);
2261	vdIfErrorMessage(pImage->pIfError, "Header: uuidParent={%RTuuid}\n", &pImage->ParentUuid);
2262	}
2263
2264	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetTimestamp} */
2265	static DECLCALLBACK(int) vhdGetTimestamp(void *pBackendData, PRTTIMESPEC pTimestamp)
2266	{
2267	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2268
2269	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2270
2271	int rc = vdIfIoIntFileGetModificationTime(pImage->pIfIo, pImage->pszFilename, pTimestamp);
2272
2273	LogFlowFunc(("returns %Rrc\n", rc));
2274	return rc;
2275	}
2276
2277	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentTimestamp} */
2278	static DECLCALLBACK(int) vhdGetParentTimestamp(void *pBackendData, PRTTIMESPEC pTimestamp)
2279	{
2280	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2281
2282	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2283
2284	vhdTime2RtTime(pTimestamp, pImage->u32ParentTimestamp);
2285	LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
2286	return VINF_SUCCESS;
2287	}
2288
2289	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentTimestamp} */
2290	static DECLCALLBACK(int) vhdSetParentTimestamp(void *pBackendData, PCRTTIMESPEC pTimestamp)
2291	{
2292	int rc = VINF_SUCCESS;
2293	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2294
2295	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2296	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2297	rc = VERR_VD_IMAGE_READ_ONLY;
2298	else
2299	{
2300	pImage->u32ParentTimestamp = vhdRtTime2VhdTime(pTimestamp);
2301	pImage->fDynHdrNeedsUpdate = true;
2302	}
2303
2304	LogFlowFunc(("returns %Rrc\n", rc));
2305	return rc;
2306	}
2307
2308	/** @interface_method_impl{VDIMAGEBACKEND,pfnGetParentFilename} */
2309	static DECLCALLBACK(int) vhdGetParentFilename(void pBackendData, char *ppszParentFilename)
2310	{
2311	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2312
2313	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2314	*ppszParentFilename = RTStrDup(pImage->pszParentFilename);
2315
2316	LogFlowFunc(("returns %Rrc\n", VINF_SUCCESS));
2317	return VINF_SUCCESS;
2318	}
2319
2320	/** @interface_method_impl{VDIMAGEBACKEND,pfnSetParentFilename} */
2321	static DECLCALLBACK(int) vhdSetParentFilename(void pBackendData, const char pszParentFilename)
2322	{
2323	int rc = VINF_SUCCESS;
2324	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2325
2326	AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2327
2328	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2329	rc = VERR_VD_IMAGE_READ_ONLY;
2330	else
2331	{
2332	if (pImage->pszParentFilename)
2333	RTStrFree(pImage->pszParentFilename);
2334	pImage->pszParentFilename = RTStrDup(pszParentFilename);
2335	if (!pImage->pszParentFilename)
2336	rc = VERR_NO_MEMORY;
2337	else
2338	pImage->fDynHdrNeedsUpdate = true;
2339	}
2340
2341	LogFlowFunc(("returns %Rrc\n", rc));
2342	return rc;
2343	}
2344
2345	/** @interface_method_impl{VDIMAGEBACKEND,pfnCompact} */
2346	static DECLCALLBACK(int) vhdCompact(void *pBackendData, unsigned uPercentStart,
2347	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2348	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2349	{
2350	RT_NOREF2(pVDIfsDisk, pVDIfsImage);
2351	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2352	int rc = VINF_SUCCESS;
2353	void *pvBuf = NULL;
2354	uint32_t *paBlocks = NULL;
2355	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
2356
2357	PFNVDPARENTREAD pfnParentRead = NULL;
2358	void *pvParent = NULL;
2359	PVDINTERFACEPARENTSTATE pIfParentState = VDIfParentStateGet(pVDIfsOperation);
2360	if (pIfParentState)
2361	{
2362	pfnParentRead = pIfParentState->pfnParentRead;
2363	pvParent = pIfParentState->Core.pvUser;
2364	}
2365
2366	do
2367	{
2368	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2369
2370	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2371	rc = VERR_VD_IMAGE_READ_ONLY);
2372
2373	/* Reject fixed images as they don't have a BAT. */
2374	if (pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2375	{
2376	rc = VERR_NOT_SUPPORTED;
2377	break;
2378	}
2379
2380	if (pfnParentRead)
2381	{
2382	pvParent = RTMemTmpAlloc(pImage->cbDataBlock);
2383	AssertBreakStmt(pvParent, rc = VERR_NO_MEMORY);
2384	}
2385	pvBuf = RTMemTmpAlloc(pImage->cbDataBlock);
2386	AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY);
2387
2388	unsigned cBlocksAllocated = 0;
2389	unsigned cBlocksToMove = 0;
2390	unsigned cBlocks = pImage->cBlockAllocationTableEntries;
2391	uint32_t offBlocksStart = ~0U; /* Start offset of data blocks in sectors. */
2392	uint32_t *paBat = pImage->pBlockAllocationTable;
2393
2394	/* Count the number of allocated blocks and find the start offset for the data blocks. */
2395	for (unsigned i = 0; i < cBlocks; i++)
2396	if (paBat[i] != ~0U)
2397	{
2398	cBlocksAllocated++;
2399	if (paBat[i] < offBlocksStart)
2400	offBlocksStart = paBat[i];
2401	}
2402
2403	if (!cBlocksAllocated)
2404	{
2405	/* Nothing to do. */
2406	rc = VINF_SUCCESS;
2407	break;
2408	}
2409
2410	paBlocks = (uint32_t )RTMemTmpAllocZ(cBlocksAllocated sizeof(uint32_t));
2411	AssertBreakStmt(paBlocks, rc = VERR_NO_MEMORY);
2412
2413	/* Invalidate the back resolving array. */
2414	for (unsigned i = 0; i < cBlocksAllocated; i++)
2415	paBlocks[i] = ~0U;
2416
2417	/* Fill the back resolving table. */
2418	for (unsigned i = 0; i < cBlocks; i++)
2419	if (paBat[i] != ~0U)
2420	{
2421	unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock;
2422	if ( idxBlock < cBlocksAllocated
2423	&& paBlocks[idxBlock] == ~0U)
2424	paBlocks[idxBlock] = i;
2425	else
2426	{
2427	/* The image is in an inconsistent state. Don't go further. */
2428	rc = VERR_INVALID_STATE;
2429	break;
2430	}
2431	}
2432
2433	if (RT_FAILURE(rc))
2434	break;
2435
2436	/* Find redundant information and update the block pointers
2437	* accordingly, creating bubbles. Keep disk up to date, as this
2438	* enables cancelling. */
2439	for (unsigned i = 0; i < cBlocks; i++)
2440	{
2441	if (paBat[i] != ~0U)
2442	{
2443	unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock;
2444
2445	/* Block present in image file, read relevant data. */
2446	uint64_t u64Offset = ((uint64_t)paBat[i] + pImage->cDataBlockBitmapSectors) * VHD_SECTOR_SIZE;
2447	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2448	u64Offset, pvBuf, pImage->cbDataBlock);
2449	if (RT_FAILURE(rc))
2450	break;
2451
2452	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)pImage->cbDataBlock 8) == -1)
2453	{
2454	paBat[i] = UINT32_MAX;
2455	paBlocks[idxBlock] = ~0U;
2456	/* Adjust progress info, one block to be relocated. */
2457	cBlocksToMove++;
2458	}
2459	else if (pfnParentRead)
2460	{
2461	rc = pfnParentRead(pvParent, (uint64_t)i * pImage->cbDataBlock, pvParent, pImage->cbDataBlock);
2462	if (RT_FAILURE(rc))
2463	break;
2464	if (!memcmp(pvParent, pvBuf, pImage->cbDataBlock))
2465	{
2466	paBat[i] = ~0U;
2467	paBlocks[idxBlock] = ~0U;
2468	/* Adjust progress info, one block to be relocated. */
2469	cBlocksToMove++;
2470	}
2471	}
2472	}
2473
2474	vdIfProgress(pIfProgress, (uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2475	}
2476
2477	if (RT_SUCCESS(rc))
2478	{
2479	/* Fill bubbles with other data (if available). */
2480	unsigned cBlocksMoved = 0;
2481	unsigned uBlockUsedPos = cBlocksAllocated;
2482	size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of whole block containing the bitmap and the user data. */
2483
2484	/* Allocate data buffer to hold the data block and allocation bitmap in front of the actual data. */
2485	RTMemTmpFree(pvBuf);
2486	pvBuf = RTMemTmpAllocZ(cbBlock);
2487	AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY);
2488
2489	for (unsigned i = 0; i < cBlocksAllocated; i++)
2490	{
2491	unsigned uBlock = paBlocks[i];
2492	if (uBlock == ~0U)
2493	{
2494	unsigned uBlockData = ~0U;
2495	while (uBlockUsedPos > i && uBlockData == ~0U)
2496	{
2497	uBlockUsedPos--;
2498	uBlockData = paBlocks[uBlockUsedPos];
2499	}
2500	/* Terminate early if there is no block which needs copying. */
2501	if (uBlockUsedPos == i)
2502	break;
2503	uint64_t u64Offset = (uint64_t)uBlockUsedPos * cbBlock
2504	+ (offBlocksStart * VHD_SECTOR_SIZE);
2505	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2506	u64Offset, pvBuf, cbBlock);
2507	if (RT_FAILURE(rc))
2508	break;
2509
2510	u64Offset = (uint64_t)i * cbBlock
2511	+ (offBlocksStart * VHD_SECTOR_SIZE);
2512	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2513	u64Offset, pvBuf, cbBlock);
2514	if (RT_FAILURE(rc))
2515	break;
2516
2517	paBat[uBlockData] = i*(pImage->cSectorsPerDataBlock + pImage->cDataBlockBitmapSectors) + offBlocksStart;
2518
2519	/* Truncate the file but leave enough room for the footer to avoid
2520	* races if other processes fill the whole harddisk. */
2521	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
2522	pImage->uCurrentEndOfFile - cbBlock + VHD_SECTOR_SIZE);
2523	if (RT_FAILURE(rc))
2524	break;
2525
2526	/* Update pointers and write footer. */
2527	pImage->uCurrentEndOfFile -= cbBlock;
2528
2529	/* We're kinda screwed if this failes. */
2530	rc = vhdUpdateFooter(pImage);
2531	if (RT_FAILURE(rc))
2532	break;
2533
2534	paBlocks[i] = uBlockData;
2535	paBlocks[uBlockUsedPos] = ~0U;
2536	cBlocksMoved++;
2537	}
2538
2539	rc = vdIfProgress(pIfProgress, (uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2540	}
2541	}
2542
2543	/* Write the new BAT in any case. */
2544	int rc2 = vhdFlushImage(pImage);
2545	if (RT_SUCCESS(rc))
2546	rc = rc2;
2547	} while (0);
2548
2549	if (paBlocks)
2550	RTMemTmpFree(paBlocks);
2551	if (pvParent)
2552	RTMemTmpFree(pvParent);
2553	if (pvBuf)
2554	RTMemTmpFree(pvBuf);
2555
2556	if (RT_SUCCESS(rc))
2557	vdIfProgress(pIfProgress, uPercentStart + uPercentSpan);
2558
2559	LogFlowFunc(("returns %Rrc\n", rc));
2560	return rc;
2561	}
2562
2563	/** @interface_method_impl{VDIMAGEBACKEND,pfnResize} */
2564	static DECLCALLBACK(int) vhdResize(void *pBackendData, uint64_t cbSize,
2565	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2566	unsigned uPercentStart, unsigned uPercentSpan,
2567	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2568	PVDINTERFACE pVDIfsOperation)
2569	{
2570	RT_NOREF5(uPercentSpan, uPercentStart, pVDIfsDisk, pVDIfsImage, pVDIfsOperation);
2571	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2572	int rc = VINF_SUCCESS;
2573
2574	/* Making the image smaller is not supported at the moment. */
2575	if (cbSize < pImage->cbSize)
2576	rc = VERR_VD_SHRINK_NOT_SUPPORTED;
2577	else if (pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2578	rc = VERR_NOT_SUPPORTED;
2579	else if (cbSize > pImage->cbSize)
2580	{
2581	unsigned cBlocksAllocated = 0;
2582	size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of a block including the sector bitmap. */
2583	uint32_t cBlocksNew = cbSize / pImage->cbDataBlock; /** < New number of blocks in the image after the resize */
2584	if (cbSize % pImage->cbDataBlock)
2585	cBlocksNew++;
2586
2587	uint32_t cBlocksOld = pImage->cBlockAllocationTableEntries; /** < Number of blocks before the resize. */
2588	uint64_t cbBlockspaceNew = RT_ALIGN_32(cBlocksNew * sizeof(uint32_t), VHD_SECTOR_SIZE); /** < Required space for the block array after the resize. */
2589	uint64_t offStartDataNew = RT_ALIGN_32(pImage->uBlockAllocationTableOffset + cbBlockspaceNew, VHD_SECTOR_SIZE); /** < New start offset for block data after the resize */
2590	uint64_t offStartDataOld = ~0ULL;
2591
2592	/* Go through the BAT and find the data start offset. */
2593	for (unsigned idxBlock = 0; idxBlock < pImage->cBlockAllocationTableEntries; idxBlock++)
2594	{
2595	if (pImage->pBlockAllocationTable[idxBlock] != ~0U)
2596	{
2597	uint64_t offStartBlock = (uint64_t)pImage->pBlockAllocationTable[idxBlock] * VHD_SECTOR_SIZE;
2598	if (offStartBlock < offStartDataOld)
2599	offStartDataOld = offStartBlock;
2600	cBlocksAllocated++;
2601	}
2602	}
2603
2604	if ( offStartDataOld != offStartDataNew
2605	&& cBlocksAllocated > 0)
2606	{
2607	/* Calculate how many sectors nee to be relocated. */
2608	uint64_t cbOverlapping = offStartDataNew - offStartDataOld;
2609	unsigned cBlocksReloc = (unsigned)(cbOverlapping / cbBlock);
2610	if (cbOverlapping % cbBlock)
2611	cBlocksReloc++;
2612
2613	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2614	offStartDataNew = offStartDataOld;
2615
2616	/* Do the relocation. */
2617	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2618
2619	/*
2620	* Get the blocks we need to relocate first, they are appended to the end
2621	* of the image.
2622	*/
2623	void pvBuf = NULL, pvZero = NULL;
2624	do
2625	{
2626	/* Allocate data buffer. */
2627	pvBuf = RTMemAllocZ(cbBlock);
2628	if (!pvBuf)
2629	{
2630	rc = VERR_NO_MEMORY;
2631	break;
2632	}
2633
2634	/* Allocate buffer for overwriting with zeroes. */
2635	pvZero = RTMemAllocZ(cbBlock);
2636	if (!pvZero)
2637	{
2638	rc = VERR_NO_MEMORY;
2639	break;
2640	}
2641
2642	for (unsigned i = 0; i < cBlocksReloc; i++)
2643	{
2644	uint32_t uBlock = offStartDataNew / VHD_SECTOR_SIZE;
2645
2646	/* Search the index in the block table. */
2647	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2648	{
2649	if (pImage->pBlockAllocationTable[idxBlock] == uBlock)
2650	{
2651	/* Read data and append to the end of the image. */
2652	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2653	offStartDataNew, pvBuf, cbBlock);
2654	if (RT_FAILURE(rc))
2655	break;
2656
2657	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2658	pImage->uCurrentEndOfFile, pvBuf, cbBlock);
2659	if (RT_FAILURE(rc))
2660	break;
2661
2662	/* Zero out the old block area. */
2663	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2664	offStartDataNew, pvZero, cbBlock);
2665	if (RT_FAILURE(rc))
2666	break;
2667
2668	/* Update block counter. */
2669	pImage->pBlockAllocationTable[idxBlock] = pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE;
2670
2671	pImage->uCurrentEndOfFile += cbBlock;
2672
2673	/* Continue with the next block. */
2674	break;
2675	}
2676	}
2677
2678	if (RT_FAILURE(rc))
2679	break;
2680
2681	offStartDataNew += cbBlock;
2682	}
2683	} while (0);
2684
2685	if (pvBuf)
2686	RTMemFree(pvBuf);
2687	if (pvZero)
2688	RTMemFree(pvZero);
2689	}
2690
2691	/*
2692	* Relocation done, expand the block array and update the header with
2693	* the new data.
2694	*/
2695	if (RT_SUCCESS(rc))
2696	{
2697	uint32_t paBlocksNew = (uint32_t )RTMemRealloc(pImage->pBlockAllocationTable, cBlocksNew * sizeof(uint32_t));
2698	if (paBlocksNew)
2699	{
2700	pImage->pBlockAllocationTable = paBlocksNew;
2701
2702	/* Mark the new blocks as unallocated. */
2703	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
2704	pImage->pBlockAllocationTable[idxBlock] = ~0U;
2705	}
2706	else
2707	rc = VERR_NO_MEMORY;
2708
2709	if (RT_SUCCESS(rc))
2710	{
2711	/* Write the block array before updating the rest. */
2712	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2713	pImage->uBlockAllocationTableOffset,
2714	pImage->pBlockAllocationTable,
2715	cBlocksNew * sizeof(uint32_t));
2716	}
2717
2718	if (RT_SUCCESS(rc))
2719	{
2720	/* Update size and new block count. */
2721	pImage->cBlockAllocationTableEntries = cBlocksNew;
2722	pImage->cbSize = cbSize;
2723
2724	/* Update geometry. */
2725	pImage->PCHSGeometry = *pPCHSGeometry;
2726	pImage->LCHSGeometry = *pLCHSGeometry;
2727	}
2728	}
2729
2730	/* Update header information in base image file. */
2731	pImage->fDynHdrNeedsUpdate = true;
2732	vhdFlushImage(pImage);
2733	}
2734	/* Same size doesn't change the image at all. */
2735
2736	LogFlowFunc(("returns %Rrc\n", rc));
2737	return rc;
2738	}
2739
2740	/** @interface_method_impl{VDIMAGEBACKEND,pfnRepair} */
2741	static DECLCALLBACK(int) vhdRepair(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
2742	PVDINTERFACE pVDIfsImage, uint32_t fFlags)
2743	{
2744	LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
2745	int rc;
2746	PVDINTERFACEERROR pIfError;
2747	PVDINTERFACEIOINT pIfIo;
2748	PVDIOSTORAGE pStorage = NULL;
2749	uint64_t cbFile;
2750	VHDFooter vhdFooter;
2751	VHDDynamicDiskHeader dynamicDiskHeader;
2752	uint32_t *paBat = NULL;
2753	uint32_t *pu32BlockBitmap = NULL;
2754
2755	pIfIo = VDIfIoIntGet(pVDIfsImage);
2756	AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
2757
2758	pIfError = VDIfErrorGet(pVDIfsDisk);
2759
2760	do
2761	{
2762	uint64_t offDynamicDiskHeader = 0;
2763	uint64_t offBat = 0;
2764	uint64_t offFooter = 0;
2765	uint32_t cBatEntries = 0;
2766	bool fDynamic = false;
2767	bool fRepairFooter = false;
2768	bool fRepairBat = false;
2769	bool fRepairDynHeader = false;
2770
2771	rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
2772	VDOpenFlagsToFileOpenFlags( fFlags & VD_REPAIR_DRY_RUN
2773	? VD_OPEN_FLAGS_READONLY
2774	: 0,
2775	false /* fCreate */),
2776	&pStorage);
2777	if (RT_FAILURE(rc))
2778	{
2779	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to open image \"%s\"", pszFilename);
2780	break;
2781	}
2782
2783	rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
2784	if (RT_FAILURE(rc))
2785	{
2786	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to query image size");
2787	break;
2788	}
2789
2790	if (cbFile < sizeof(VHDFooter))
2791	{
2792	rc = vdIfError(pIfError, VERR_VD_INVALID_SIZE, RT_SRC_POS,
2793	"Image must be at least %u bytes (got %llu)",
2794	sizeof(VHDFooter), cbFile);
2795	break;
2796	}
2797
2798	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter),
2799	&vhdFooter, sizeof(VHDFooter));
2800	if (RT_FAILURE(rc))
2801	{
2802	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read footer of image");
2803	break;
2804	}
2805
2806	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
2807	{
2808	/* Dynamic images have a backup at the beginning of the image. */
2809	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0,
2810	&vhdFooter, sizeof(VHDFooter));
2811	if (RT_FAILURE(rc))
2812	{
2813	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read header of image");
2814	break;
2815	}
2816
2817	/*
2818	* Check for the header, if this fails the image is either completely corrupted
2819	* and impossible to repair or in another format.
2820	*/
2821	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
2822	{
2823	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2824	"No valid VHD structures found");
2825	break;
2826	}
2827	else
2828	vdIfErrorMessage(pIfError, "Missing footer structure, using backup\n");
2829
2830	/* Remember to fix the footer structure. */
2831	fRepairFooter = true;
2832	}
2833
2834	offFooter = cbFile - sizeof(VHDFooter);
2835
2836	/* Verify that checksums match. */
2837	uint32_t u32ChkSumOld = RT_BE2H_U32(vhdFooter.Checksum);
2838	vhdFooter.Checksum = 0;
2839	uint32_t u32ChkSum = vhdChecksum(&vhdFooter, sizeof(VHDFooter));
2840
2841	vhdFooter.Checksum = RT_H2BE_U32(u32ChkSum);
2842
2843	if (u32ChkSumOld != u32ChkSum)
2844	{
2845	vdIfErrorMessage(pIfError, "Checksum is invalid (should be %u got %u), repairing\n",
2846	u32ChkSum, u32ChkSumOld);
2847	fRepairFooter = true;
2848	}
2849
2850	switch (RT_BE2H_U32(vhdFooter.DiskType))
2851	{
2852	case VHD_FOOTER_DISK_TYPE_FIXED:
2853	fDynamic = false;
2854	break;
2855	case VHD_FOOTER_DISK_TYPE_DYNAMIC:
2856	fDynamic = true;
2857	break;
2858	case VHD_FOOTER_DISK_TYPE_DIFFERENCING:
2859	fDynamic = true;
2860	break;
2861	default:
2862	{
2863	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2864	"VHD image type %u is not supported",
2865	RT_BE2H_U32(vhdFooter.DiskType));
2866	break;
2867	}
2868	}
2869
2870	/* Load and check dynamic disk header if required. */
2871	if (fDynamic)
2872	{
2873	size_t cbBlock;
2874
2875	offDynamicDiskHeader = RT_BE2H_U64(vhdFooter.DataOffset);
2876	if (offDynamicDiskHeader + sizeof(VHDDynamicDiskHeader) > cbFile)
2877	{
2878	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2879	"VHD image type is not supported");
2880	break;
2881	}
2882
2883	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offDynamicDiskHeader,
2884	&dynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
2885	if (RT_FAILURE(rc))
2886	{
2887	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2888	"Failed to read dynamic disk header (at %llu), %Rrc",
2889	offDynamicDiskHeader, rc);
2890	break;
2891	}
2892
2893	/* Verify that checksums match. */
2894	u32ChkSumOld = RT_BE2H_U32(dynamicDiskHeader.Checksum);
2895	dynamicDiskHeader.Checksum = 0;
2896	u32ChkSum = vhdChecksum(&dynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
2897
2898	dynamicDiskHeader.Checksum = RT_H2BE_U32(u32ChkSum);
2899
2900	if (u32ChkSumOld != u32ChkSum)
2901	{
2902	vdIfErrorMessage(pIfError, "Checksum of dynamic disk header is invalid (should be %u got %u), repairing\n",
2903	u32ChkSum, u32ChkSumOld);
2904	fRepairDynHeader = true;
2905	}
2906
2907	/* Read the block allocation table and fix any inconsistencies. */
2908	offBat = RT_BE2H_U64(dynamicDiskHeader.TableOffset);
2909	cBatEntries = RT_BE2H_U32(dynamicDiskHeader.MaxTableEntries);
2910	cbBlock = RT_BE2H_U32(dynamicDiskHeader.BlockSize);
2911	cbBlock += cbBlock / VHD_SECTOR_SIZE / 8;
2912
2913	if (offBat + cBatEntries * sizeof(uint32_t) > cbFile)
2914	{
2915	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2916	"Block allocation table is not inside the image");
2917	break;
2918	}
2919
2920	paBat = (uint32_t )RTMemAllocZ(cBatEntries sizeof(uint32_t));
2921	if (!paBat)
2922	{
2923	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2924	"Could not allocate memory for the block allocation table (%u bytes)",
2925	cBatEntries * sizeof(uint32_t));
2926	break;
2927	}
2928
2929	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offBat, paBat,
2930	cBatEntries * sizeof(uint32_t));
2931	if (RT_FAILURE(rc))
2932	{
2933	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2934	"Could not read block allocation table (at %llu), %Rrc",
2935	offBat, rc);
2936	break;
2937	}
2938
2939	pu32BlockBitmap = (uint32_t *)RTMemAllocZ(RT_ALIGN_Z(cBatEntries / 8, 4));
2940	if (!pu32BlockBitmap)
2941	{
2942	rc = vdIfError(pIfError, VERR_NO_MEMORY, RT_SRC_POS,
2943	"Failed to allocate memory for block bitmap");
2944	break;
2945	}
2946
2947	uint32_t idxMinBlock = UINT32_C(0xffffffff);
2948	for (uint32_t i = 0; i < cBatEntries; i++)
2949	{
2950	paBat[i] = RT_BE2H_U32(paBat[i]);
2951	if (paBat[i] < idxMinBlock)
2952	idxMinBlock = paBat[i];
2953	}
2954
2955	vdIfErrorMessage(pIfError, "First data block at sector %u\n", idxMinBlock);
2956
2957	for (uint32_t i = 0; i < cBatEntries; i++)
2958	{
2959	if (paBat[i] != UINT32_C(0xffffffff))
2960	{
2961	uint64_t offBlock =(uint64_t)paBat[i] * VHD_SECTOR_SIZE;
2962
2963	/*
2964	* Check that the offsets are valid (inside of the image) and
2965	* that there are no double references.
2966	*/
2967	if (offBlock + cbBlock > cbFile)
2968	{
2969	vdIfErrorMessage(pIfError, "Entry %u points to invalid offset %llu, clearing\n",
2970	i, offBlock);
2971	paBat[i] = UINT32_C(0xffffffff);
2972	fRepairBat = true;
2973	}
2974	else if (offBlock + cbBlock > offFooter)
2975	{
2976	vdIfErrorMessage(pIfError, "Entry %u intersects with footer, aligning footer\n",
2977	i);
2978	offFooter = offBlock + cbBlock;
2979	fRepairBat = true;
2980	}
2981
2982	if ( paBat[i] != UINT32_C(0xffffffff)
2983	&& ASMBitTestAndSet(pu32BlockBitmap, (uint32_t)((paBat[i] - idxMinBlock) / (cbBlock / VHD_SECTOR_SIZE))))
2984	{
2985	vdIfErrorMessage(pIfError, "Entry %u points to an already referenced data block, clearing\n",
2986	i);
2987	paBat[i] = UINT32_C(0xffffffff);
2988	fRepairBat = true;
2989	}
2990	}
2991	}
2992	}
2993
2994	/* Write repaired structures now. */
2995	if (!(fRepairBat \|\| fRepairDynHeader \|\| fRepairFooter))
2996	vdIfErrorMessage(pIfError, "VHD image is in a consistent state, no repair required\n");
2997	else if (!(fFlags & VD_REPAIR_DRY_RUN))
2998	{
2999	if (fRepairBat)
3000	{
3001	for (uint32_t i = 0; i < cBatEntries; i++)
3002	paBat[i] = RT_H2BE_U32(paBat[i]);
3003
3004	vdIfErrorMessage(pIfError, "Writing repaired block allocation table...\n");
3005
3006	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offBat, paBat,
3007	cBatEntries * sizeof(uint32_t));
3008	if (RT_FAILURE(rc))
3009	{
3010	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3011	"Could not write repaired block allocation table (at %llu), %Rrc",
3012	offBat, rc);
3013	break;
3014	}
3015	}
3016
3017	if (fRepairDynHeader)
3018	{
3019	Assert(fDynamic);
3020
3021	vdIfErrorMessage(pIfError, "Writing repaired dynamic disk header...\n");
3022	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offDynamicDiskHeader, &dynamicDiskHeader,
3023	sizeof(VHDDynamicDiskHeader));
3024	if (RT_FAILURE(rc))
3025	{
3026	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3027	"Could not write repaired dynamic disk header (at %llu), %Rrc",
3028	offDynamicDiskHeader, rc);
3029	break;
3030	}
3031	}
3032
3033	if (fRepairFooter)
3034	{
3035	vdIfErrorMessage(pIfError, "Writing repaired Footer...\n");
3036
3037	if (fDynamic)
3038	{
3039	/* Write backup at image beginning. */
3040	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, 0, &vhdFooter,
3041	sizeof(VHDFooter));
3042	if (RT_FAILURE(rc))
3043	{
3044	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3045	"Could not write repaired backup footer (at %llu), %Rrc",
3046	0, rc);
3047	break;
3048	}
3049	}
3050
3051	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offFooter, &vhdFooter,
3052	sizeof(VHDFooter));
3053	if (RT_FAILURE(rc))
3054	{
3055	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3056	"Could not write repaired footer (at %llu), %Rrc",
3057	cbFile - sizeof(VHDFooter), rc);
3058	break;
3059	}
3060	}
3061
3062	vdIfErrorMessage(pIfError, "Corrupted VHD image repaired successfully\n");
3063	}
3064	} while(0);
3065
3066	if (paBat)
3067	RTMemFree(paBat);
3068
3069	if (pu32BlockBitmap)
3070	RTMemFree(pu32BlockBitmap);
3071
3072	if (pStorage)
3073	{
3074	int rc2 = vdIfIoIntFileClose(pIfIo, pStorage);
3075	if (RT_SUCCESS(rc))
3076	rc = rc2; /* Propagate status code only when repairing the image was successful. */
3077	}
3078
3079	LogFlowFunc(("returns %Rrc\n", rc));
3080	return rc;
3081	}
3082
3083
3084	const VDIMAGEBACKEND g_VhdBackend =
3085	{
3086	/* u32Version */
3087	VD_IMGBACKEND_VERSION,
3088	/* pszBackendName */
3089	"VHD",
3090	/* uBackendCaps */
3091	VD_CAP_UUID \| VD_CAP_DIFF \| VD_CAP_FILE \|
3092	VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC \|
3093	VD_CAP_ASYNC \| VD_CAP_VFS \| VD_CAP_PREFERRED,
3094	/* paFileExtensions */
3095	s_aVhdFileExtensions,
3096	/* paConfigInfo */
3097	NULL,
3098	/* pfnProbe */
3099	vhdProbe,
3100	/* pfnOpen */
3101	vhdOpen,
3102	/* pfnCreate */
3103	vhdCreate,
3104	/* pfnRename */
3105	vhdRename,
3106	/* pfnClose */
3107	vhdClose,
3108	/* pfnRead */
3109	vhdRead,
3110	/* pfnWrite */
3111	vhdWrite,
3112	/* pfnFlush */
3113	vhdFlush,
3114	/* pfnDiscard */
3115	NULL,
3116	/* pfnGetVersion */
3117	vhdGetVersion,
3118	/* pfnGetFileSize */
3119	vhdGetFileSize,
3120	/* pfnGetPCHSGeometry */
3121	vhdGetPCHSGeometry,
3122	/* pfnSetPCHSGeometry */
3123	vhdSetPCHSGeometry,
3124	/* pfnGetLCHSGeometry */
3125	vhdGetLCHSGeometry,
3126	/* pfnSetLCHSGeometry */
3127	vhdSetLCHSGeometry,
3128	/* pfnQueryRegions */
3129	vhdQueryRegions,
3130	/* pfnRegionListRelease */
3131	vhdRegionListRelease,
3132	/* pfnGetImageFlags */
3133	vhdGetImageFlags,
3134	/* pfnGetOpenFlags */
3135	vhdGetOpenFlags,
3136	/* pfnSetOpenFlags */
3137	vhdSetOpenFlags,
3138	/* pfnGetComment */
3139	vhdGetComment,
3140	/* pfnSetComment */
3141	vhdSetComment,
3142	/* pfnGetUuid */
3143	vhdGetUuid,
3144	/* pfnSetUuid */
3145	vhdSetUuid,
3146	/* pfnGetModificationUuid */
3147	vhdGetModificationUuid,
3148	/* pfnSetModificationUuid */
3149	vhdSetModificationUuid,
3150	/* pfnGetParentUuid */
3151	vhdGetParentUuid,
3152	/* pfnSetParentUuid */
3153	vhdSetParentUuid,
3154	/* pfnGetParentModificationUuid */
3155	vhdGetParentModificationUuid,
3156	/* pfnSetParentModificationUuid */
3157	vhdSetParentModificationUuid,
3158	/* pfnDump */
3159	vhdDump,
3160	/* pfnGetTimestamp */
3161	vhdGetTimestamp,
3162	/* pfnGetParentTimestamp */
3163	vhdGetParentTimestamp,
3164	/* pfnSetParentTimestamp */
3165	vhdSetParentTimestamp,
3166	/* pfnGetParentFilename */
3167	vhdGetParentFilename,
3168	/* pfnSetParentFilename */
3169	vhdSetParentFilename,
3170	/* pfnComposeLocation */
3171	genericFileComposeLocation,
3172	/* pfnComposeName */
3173	genericFileComposeName,
3174	/* pfnCompact */
3175	vhdCompact,
3176	/* pfnResize */
3177	vhdResize,
3178	/* pfnRepair */
3179	vhdRepair,
3180	/* pfnTraverseMetadata */
3181	NULL,
3182	/* u32VersionEnd */
3183	VD_IMGBACKEND_VERSION
3184	};

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source: vbox/trunk/src/VBox/Storage/VHD.cpp@ 106212

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