VHD.cpp@ 54430

Last change on this file since 54430 was 54430, checked in by vboxsync, 10 years ago
Storage/VD: make use of the image type (hdd/dvd/floppy) for sanity checking when creating disk images
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1	/* $Id: VHD.cpp 54430 2015-02-24 10:43:16Z vboxsync $ */
2	/** @file
3	* VHD Disk image, Core Code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_VD_VHD
22	#include <VBox/vd-plugin.h>
23	#include <VBox/err.h>
24
25	#include <VBox/log.h>
26	#include <VBox/version.h>
27	#include <iprt/asm.h>
28	#include <iprt/assert.h>
29	#include <iprt/mem.h>
30	#include <iprt/uuid.h>
31	#include <iprt/path.h>
32	#include <iprt/string.h>
33
34	#include "VDBackends.h"
35
36	#define VHD_RELATIVE_MAX_PATH 512
37	#define VHD_ABSOLUTE_MAX_PATH 512
38
39	#define VHD_SECTOR_SIZE 512
40	#define VHD_BLOCK_SIZE (2 * _1M)
41
42	/* This is common to all VHD disk types and is located at the end of the image */
43	#pragma pack(1)
44	typedef struct VHDFooter
45	{
46	char Cookie[8];
47	uint32_t Features;
48	uint32_t Version;
49	uint64_t DataOffset;
50	uint32_t TimeStamp;
51	uint8_t CreatorApp[4];
52	uint32_t CreatorVer;
53	uint32_t CreatorOS;
54	uint64_t OrigSize;
55	uint64_t CurSize;
56	uint16_t DiskGeometryCylinder;
57	uint8_t DiskGeometryHeads;
58	uint8_t DiskGeometrySectors;
59	uint32_t DiskType;
60	uint32_t Checksum;
61	char UniqueID[16];
62	uint8_t SavedState;
63	uint8_t Reserved[427];
64	} VHDFooter;
65	#pragma pack()
66
67	/* this really is spelled with only one n */
68	#define VHD_FOOTER_COOKIE "conectix"
69	#define VHD_FOOTER_COOKIE_SIZE 8
70
71	#define VHD_FOOTER_FEATURES_NOT_ENABLED 0
72	#define VHD_FOOTER_FEATURES_TEMPORARY 1
73	#define VHD_FOOTER_FEATURES_RESERVED 2
74
75	#define VHD_FOOTER_FILE_FORMAT_VERSION 0x00010000
76	#define VHD_FOOTER_DATA_OFFSET_FIXED UINT64_C(0xffffffffffffffff)
77	#define VHD_FOOTER_DISK_TYPE_FIXED 2
78	#define VHD_FOOTER_DISK_TYPE_DYNAMIC 3
79	#define VHD_FOOTER_DISK_TYPE_DIFFERENCING 4
80
81	#define VHD_MAX_LOCATOR_ENTRIES 8
82	#define VHD_PLATFORM_CODE_NONE 0
83	#define VHD_PLATFORM_CODE_WI2R 0x57693272
84	#define VHD_PLATFORM_CODE_WI2K 0x5769326B
85	#define VHD_PLATFORM_CODE_W2RU 0x57327275
86	#define VHD_PLATFORM_CODE_W2KU 0x57326B75
87	#define VHD_PLATFORM_CODE_MAC 0x4D163220
88	#define VHD_PLATFORM_CODE_MACX 0x4D163258
89
90	/* Header for expanding disk images. */
91	#pragma pack(1)
92	typedef struct VHDParentLocatorEntry
93	{
94	uint32_t u32Code;
95	uint32_t u32DataSpace;
96	uint32_t u32DataLength;
97	uint32_t u32Reserved;
98	uint64_t u64DataOffset;
99	} VHDPLE, *PVHDPLE;
100
101	typedef struct VHDDynamicDiskHeader
102	{
103	char Cookie[8];
104	uint64_t DataOffset;
105	uint64_t TableOffset;
106	uint32_t HeaderVersion;
107	uint32_t MaxTableEntries;
108	uint32_t BlockSize;
109	uint32_t Checksum;
110	uint8_t ParentUuid[16];
111	uint32_t ParentTimeStamp;
112	uint32_t Reserved0;
113	uint16_t ParentUnicodeName[256];
114	VHDPLE ParentLocatorEntry[VHD_MAX_LOCATOR_ENTRIES];
115	uint8_t Reserved1[256];
116	} VHDDynamicDiskHeader;
117	#pragma pack()
118
119	#define VHD_DYNAMIC_DISK_HEADER_COOKIE "cxsparse"
120	#define VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE 8
121	#define VHD_DYNAMIC_DISK_HEADER_VERSION 0x00010000
122
123	/**
124	* Complete VHD image data structure.
125	*/
126	typedef struct VHDIMAGE
127	{
128	/** Image file name. */
129	const char *pszFilename;
130	/** Opaque storage handle. */
131	PVDIOSTORAGE pStorage;
132
133	/** Pointer to the per-disk VD interface list. */
134	PVDINTERFACE pVDIfsDisk;
135	/** Pointer to the per-image VD interface list. */
136	PVDINTERFACE pVDIfsImage;
137	/** Error interface. */
138	PVDINTERFACEERROR pIfError;
139	/** I/O interface. */
140	PVDINTERFACEIOINT pIfIo;
141
142	/** Open flags passed by VBoxHDD layer. */
143	unsigned uOpenFlags;
144	/** Image flags defined during creation or determined during open. */
145	unsigned uImageFlags;
146	/** Total size of the image. */
147	uint64_t cbSize;
148
149	/** Physical geometry of this image. */
150	VDGEOMETRY PCHSGeometry;
151	/** Logical geometry of this image. */
152	VDGEOMETRY LCHSGeometry;
153
154	/** Image UUID. */
155	RTUUID ImageUuid;
156	/** Parent image UUID. */
157	RTUUID ParentUuid;
158
159	/** Parent's time stamp at the time of image creation. */
160	uint32_t u32ParentTimeStamp;
161	/** Relative path to the parent image. */
162	char *pszParentFilename;
163
164	/** The Block Allocation Table. */
165	uint32_t *pBlockAllocationTable;
166	/** Number of entries in the table. */
167	uint32_t cBlockAllocationTableEntries;
168
169	/** Size of one data block. */
170	uint32_t cbDataBlock;
171	/** Sectors per data block. */
172	uint32_t cSectorsPerDataBlock;
173	/** Length of the sector bitmap in bytes. */
174	uint32_t cbDataBlockBitmap;
175	/** A copy of the disk footer. */
176	VHDFooter vhdFooterCopy;
177	/** Current end offset of the file (without the disk footer). */
178	uint64_t uCurrentEndOfFile;
179	/** Size of the data block bitmap in sectors. */
180	uint32_t cDataBlockBitmapSectors;
181	/** Start of the block allocation table. */
182	uint64_t uBlockAllocationTableOffset;
183	/** Buffer to hold block's bitmap for bit search operations. */
184	uint8_t *pu8Bitmap;
185	/** Offset to the next data structure (dynamic disk header). */
186	uint64_t u64DataOffset;
187	/** Flag to force dynamic disk header update. */
188	bool fDynHdrNeedsUpdate;
189	} VHDIMAGE, *PVHDIMAGE;
190
191	/**
192	* Structure tracking the expansion process of the image
193	* for async access.
194	*/
195	typedef struct VHDIMAGEEXPAND
196	{
197	/** Flag indicating the status of each step. */
198	volatile uint32_t fFlags;
199	/** The index in the block allocation table which is written. */
200	uint32_t idxBatAllocated;
201	/** Big endian representation of the block index
202	* which is written in the BAT. */
203	uint32_t idxBlockBe;
204	/** Old end of the file - used for rollback in case of an error. */
205	uint64_t cbEofOld;
206	/** Sector bitmap written to the new block - variable in size. */
207	uint8_t au8Bitmap[1];
208	} VHDIMAGEEXPAND, *PVHDIMAGEEXPAND;
209
210	/**
211	* Flag defines
212	*/
213	#define VHDIMAGEEXPAND_STEP_IN_PROGRESS (0x0)
214	#define VHDIMAGEEXPAND_STEP_FAILED (0x2)
215	#define VHDIMAGEEXPAND_STEP_SUCCESS (0x3)
216	/** All steps completed successfully. */
217	#define VHDIMAGEEXPAND_ALL_SUCCESS (0xff)
218	/** All steps completed (no success indicator) */
219	#define VHDIMAGEEXPAND_ALL_COMPLETE (0xaa)
220
221	/** Every status field has 2 bits so we can encode 4 steps in one byte. */
222	#define VHDIMAGEEXPAND_STATUS_MASK 0x03
223	#define VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT 0x00
224	#define VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT 0x02
225	#define VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT 0x04
226	#define VHDIMAGEEXPAND_BAT_STATUS_SHIFT 0x06
227
228	/**
229	* Helper macros to get and set the status field.
230	*/
231	#define VHDIMAGEEXPAND_STATUS_GET(fFlags, cShift) \
232	(((fFlags) >> (cShift)) & VHDIMAGEEXPAND_STATUS_MASK)
233	#define VHDIMAGEEXPAND_STATUS_SET(fFlags, cShift, uVal) \
234	ASMAtomicOrU32(&(fFlags), ((uVal) & VHDIMAGEEXPAND_STATUS_MASK) << (cShift))
235
236	/*******************************************************************************
237	* Static Variables *
238	*******************************************************************************/
239
240	/** NULL-terminated array of supported file extensions. */
241	static const VDFILEEXTENSION s_aVhdFileExtensions[] =
242	{
243	{"vhd", VDTYPE_HDD},
244	{NULL, VDTYPE_INVALID}
245	};
246
247	/*******************************************************************************
248	* Internal Functions *
249	*******************************************************************************/
250
251
252	/**
253	* Internal: Compute and update header checksum.
254	*/
255	static uint32_t vhdChecksum(void *pHeader, uint32_t cbSize)
256	{
257	uint32_t checksum = 0;
258	for (uint32_t i = 0; i < cbSize; i++)
259	checksum += ((unsigned char *)pHeader)[i];
260	return ~checksum;
261	}
262
263	/**
264	* Internal: Convert filename to UTF16 with appropriate endianness.
265	*/
266	static int vhdFilenameToUtf16(const char pszFilename, uint16_t pu16Buf,
267	uint32_t cbBufSize, uint32_t *pcbActualSize,
268	bool fBigEndian)
269	{
270	int rc;
271	PRTUTF16 tmp16 = NULL;
272	size_t cTmp16Len;
273
274	rc = RTStrToUtf16(pszFilename, &tmp16);
275	if (RT_FAILURE(rc))
276	goto out;
277	cTmp16Len = RTUtf16Len(tmp16);
278	if (cTmp16Len * sizeof(*tmp16) > cbBufSize)
279	{
280	rc = VERR_FILENAME_TOO_LONG;
281	goto out;
282	}
283
284	if (fBigEndian)
285	for (unsigned i = 0; i < cTmp16Len; i++)
286	pu16Buf[i] = RT_H2BE_U16(tmp16[i]);
287	else
288	memcpy(pu16Buf, tmp16, cTmp16Len * sizeof(*tmp16));
289	if (pcbActualSize)
290	pcbActualSize = (uint32_t)(cTmp16Len sizeof(*tmp16));
291
292	out:
293	if (tmp16)
294	RTUtf16Free(tmp16);
295	return rc;
296	}
297
298	/**
299	* Internal: Update one locator entry.
300	*/
301	static int vhdLocatorUpdate(PVHDIMAGE pImage, PVHDPLE pLocator, const char *pszFilename)
302	{
303	int rc = VINF_SUCCESS;
304	uint32_t cb, cbMaxLen = RT_BE2H_U32(pLocator->u32DataSpace);
305	void *pvBuf = RTMemTmpAllocZ(cbMaxLen);
306	char *pszTmp;
307
308	if (!pvBuf)
309	return VERR_NO_MEMORY;
310
311	switch (RT_BE2H_U32(pLocator->u32Code))
312	{
313	case VHD_PLATFORM_CODE_WI2R:
314	{
315	if (RTPathStartsWithRoot(pszFilename))
316	{
317	/* Convert to relative path. */
318	char szPath[RTPATH_MAX];
319	rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename,
320	pszFilename);
321	if (RT_SUCCESS(rc))
322	{
323	/* Update plain relative name. */
324	cb = (uint32_t)strlen(szPath);
325	if (cb > cbMaxLen)
326	{
327	rc = VERR_FILENAME_TOO_LONG;
328	break;
329	}
330	memcpy(pvBuf, szPath, cb);
331	}
332	}
333	else
334	{
335	/* Update plain relative name. */
336	cb = (uint32_t)strlen(pszFilename);
337	if (cb > cbMaxLen)
338	{
339	rc = VERR_FILENAME_TOO_LONG;
340	break;
341	}
342	memcpy(pvBuf, pszFilename, cb);
343	}
344	if (RT_SUCCESS(rc))
345	pLocator->u32DataLength = RT_H2BE_U32(cb);
346	break;
347	}
348	case VHD_PLATFORM_CODE_WI2K:
349	/* Update plain absolute name. */
350	rc = RTPathAbs(pszFilename, (char *)pvBuf, cbMaxLen);
351	if (RT_SUCCESS(rc))
352	pLocator->u32DataLength = RT_H2BE_U32((uint32_t)strlen((const char *)pvBuf));
353	break;
354	case VHD_PLATFORM_CODE_W2RU:
355	if (RTPathStartsWithRoot(pszFilename))
356	{
357	/* Convert to relative path. */
358	char szPath[RTPATH_MAX];
359	rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename,
360	pszFilename);
361	if (RT_SUCCESS(rc))
362	rc = vhdFilenameToUtf16(szPath, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
363	}
364	else
365	{
366	/* Update unicode relative name. */
367	rc = vhdFilenameToUtf16(pszFilename, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
368	}
369
370	if (RT_SUCCESS(rc))
371	pLocator->u32DataLength = RT_H2BE_U32(cb);
372	break;
373	case VHD_PLATFORM_CODE_W2KU:
374	/* Update unicode absolute name. */
375	pszTmp = (char*)RTMemTmpAllocZ(cbMaxLen);
376	if (!pszTmp)
377	{
378	rc = VERR_NO_MEMORY;
379	break;
380	}
381	rc = RTPathAbs(pszFilename, pszTmp, cbMaxLen);
382	if (RT_FAILURE(rc))
383	{
384	RTMemTmpFree(pszTmp);
385	break;
386	}
387	rc = vhdFilenameToUtf16(pszTmp, (uint16_t *)pvBuf, cbMaxLen, &cb, false);
388	RTMemTmpFree(pszTmp);
389	if (RT_SUCCESS(rc))
390	pLocator->u32DataLength = RT_H2BE_U32(cb);
391	break;
392	default:
393	rc = VERR_NOT_IMPLEMENTED;
394	break;
395	}
396
397	if (RT_SUCCESS(rc))
398	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
399	RT_BE2H_U64(pLocator->u64DataOffset),
400	pvBuf, cb);
401
402	if (pvBuf)
403	RTMemTmpFree(pvBuf);
404	return rc;
405	}
406
407	/**
408	* Internal: Update dynamic disk header from VHDIMAGE.
409	*/
410	static int vhdDynamicHeaderUpdate(PVHDIMAGE pImage)
411	{
412	VHDDynamicDiskHeader ddh;
413	int rc, i;
414
415	if (!pImage)
416	return VERR_VD_NOT_OPENED;
417
418	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
419	pImage->u64DataOffset, &ddh, sizeof(ddh));
420	if (RT_FAILURE(rc))
421	return rc;
422	if (memcmp(ddh.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE) != 0)
423	return VERR_VD_VHD_INVALID_HEADER;
424
425	uint32_t u32Checksum = RT_BE2H_U32(ddh.Checksum);
426	ddh.Checksum = 0;
427	if (u32Checksum != vhdChecksum(&ddh, sizeof(ddh)))
428	return VERR_VD_VHD_INVALID_HEADER;
429
430	/* Update parent's timestamp. */
431	ddh.ParentTimeStamp = RT_H2BE_U32(pImage->u32ParentTimeStamp);
432	/* Update parent's filename. */
433	if (pImage->pszParentFilename)
434	{
435	rc = vhdFilenameToUtf16(RTPathFilename(pImage->pszParentFilename),
436	ddh.ParentUnicodeName, sizeof(ddh.ParentUnicodeName) - 1, NULL, true);
437	if (RT_FAILURE(rc))
438	return rc;
439	}
440
441	/* Update parent's locators. */
442	for (i = 0; i < VHD_MAX_LOCATOR_ENTRIES; i++)
443	{
444	/* Skip empty locators */
445	if ( ddh.ParentLocatorEntry[i].u32Code != RT_H2BE_U32(VHD_PLATFORM_CODE_NONE)
446	&& pImage->pszParentFilename)
447	{
448	rc = vhdLocatorUpdate(pImage, &ddh.ParentLocatorEntry[i], pImage->pszParentFilename);
449	if (RT_FAILURE(rc))
450	return rc;
451	}
452	}
453	/* Update parent's UUID */
454	memcpy(ddh.ParentUuid, pImage->ParentUuid.au8, sizeof(ddh.ParentUuid));
455
456	/* Update data offset and number of table entries. */
457	ddh.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries);
458
459	ddh.Checksum = 0;
460	ddh.Checksum = RT_H2BE_U32(vhdChecksum(&ddh, sizeof(ddh)));
461	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
462	pImage->u64DataOffset, &ddh, sizeof(ddh));
463	return rc;
464	}
465
466	/**
467	* Internal: Update the VHD footer.
468	*/
469	static int vhdUpdateFooter(PVHDIMAGE pImage)
470	{
471	int rc = VINF_SUCCESS;
472
473	/* Update fields which can change. */
474	pImage->vhdFooterCopy.CurSize = RT_H2BE_U64(pImage->cbSize);
475	pImage->vhdFooterCopy.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders);
476	pImage->vhdFooterCopy.DiskGeometryHeads = pImage->PCHSGeometry.cHeads;
477	pImage->vhdFooterCopy.DiskGeometrySectors = pImage->PCHSGeometry.cSectors;
478
479	pImage->vhdFooterCopy.Checksum = 0;
480	pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter)));
481
482	if (pImage->pBlockAllocationTable)
483	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0,
484	&pImage->vhdFooterCopy, sizeof(VHDFooter));
485
486	if (RT_SUCCESS(rc))
487	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
488	pImage->uCurrentEndOfFile, &pImage->vhdFooterCopy,
489	sizeof(VHDFooter));
490
491	return rc;
492	}
493
494	/**
495	* Internal. Flush image data to disk.
496	*/
497	static int vhdFlushImage(PVHDIMAGE pImage)
498	{
499	int rc = VINF_SUCCESS;
500
501	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
502	return VINF_SUCCESS;
503
504	if (pImage->pBlockAllocationTable)
505	{
506	/*
507	* This is an expanding image. Write the BAT and copy of the disk footer.
508	*/
509	size_t cbBlockAllocationTableToWrite = pImage->cBlockAllocationTableEntries * sizeof(uint32_t);
510	uint32_t pBlockAllocationTableToWrite = (uint32_t )RTMemAllocZ(cbBlockAllocationTableToWrite);
511
512	if (!pBlockAllocationTableToWrite)
513	return VERR_NO_MEMORY;
514
515	/*
516	* The BAT entries have to be stored in big endian format.
517	*/
518	for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++)
519	pBlockAllocationTableToWrite[i] = RT_H2BE_U32(pImage->pBlockAllocationTable[i]);
520
521	/*
522	* Write the block allocation table after the copy of the disk footer and the dynamic disk header.
523	*/
524	vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset,
525	pBlockAllocationTableToWrite, cbBlockAllocationTableToWrite);
526	if (pImage->fDynHdrNeedsUpdate)
527	rc = vhdDynamicHeaderUpdate(pImage);
528	RTMemFree(pBlockAllocationTableToWrite);
529	}
530
531	if (RT_SUCCESS(rc))
532	rc = vhdUpdateFooter(pImage);
533
534	if (RT_SUCCESS(rc))
535	rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
536
537	return rc;
538	}
539
540	/**
541	* Internal. Free all allocated space for representing an image except pImage,
542	* and optionally delete the image from disk.
543	*/
544	static int vhdFreeImage(PVHDIMAGE pImage, bool fDelete)
545	{
546	int rc = VINF_SUCCESS;
547
548	/* Freeing a never allocated image (e.g. because the open failed) is
549	* not signalled as an error. After all nothing bad happens. */
550	if (pImage)
551	{
552	if (pImage->pStorage)
553	{
554	/* No point updating the file that is deleted anyway. */
555	if (!fDelete)
556	vhdFlushImage(pImage);
557
558	rc = vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
559	pImage->pStorage = NULL;
560	}
561
562	if (pImage->pszParentFilename)
563	{
564	RTStrFree(pImage->pszParentFilename);
565	pImage->pszParentFilename = NULL;
566	}
567	if (pImage->pBlockAllocationTable)
568	{
569	RTMemFree(pImage->pBlockAllocationTable);
570	pImage->pBlockAllocationTable = NULL;
571	}
572	if (pImage->pu8Bitmap)
573	{
574	RTMemFree(pImage->pu8Bitmap);
575	pImage->pu8Bitmap = NULL;
576	}
577
578	if (fDelete && pImage->pszFilename)
579	vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
580	}
581
582	LogFlowFunc(("returns %Rrc\n", rc));
583	return rc;
584	}
585
586	/* 946684800 is the number of seconds between 1/1/1970 and 1/1/2000 */
587	#define VHD_TO_UNIX_EPOCH_SECONDS UINT64_C(946684800)
588
589	static uint32_t vhdRtTime2VhdTime(PCRTTIMESPEC pRtTimeStamp)
590	{
591	uint64_t u64Seconds = RTTimeSpecGetSeconds(pRtTimeStamp);
592	return (uint32_t)(u64Seconds - VHD_TO_UNIX_EPOCH_SECONDS);
593	}
594
595	static void vhdTime2RtTime(PRTTIMESPEC pRtTimeStamp, uint32_t u32VhdTimeStamp)
596	{
597	RTTimeSpecSetSeconds(pRtTimeStamp, VHD_TO_UNIX_EPOCH_SECONDS + u32VhdTimeStamp);
598	}
599
600	/**
601	* Internal: Allocates the block bitmap rounding up to the next 32bit or 64bit boundary.
602	* Can be freed with RTMemFree. The memory is zeroed.
603	*/
604	DECLINLINE(uint8_t *)vhdBlockBitmapAllocate(PVHDIMAGE pImage)
605	{
606	#ifdef RT_ARCH_AMD64
607	return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 8);
608	#else
609	return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 4);
610	#endif
611	}
612
613	/**
614	* Internal: called when the async expansion process completed (failure or success).
615	* Will do the necessary rollback if an error occurred.
616	*/
617	static int vhdAsyncExpansionComplete(PVHDIMAGE pImage, PVDIOCTX pIoCtx, PVHDIMAGEEXPAND pExpand)
618	{
619	int rc = VINF_SUCCESS;
620	uint32_t fFlags = ASMAtomicReadU32(&pExpand->fFlags);
621	bool fIoInProgress = false;
622
623	/* Quick path, check if everything succeeded. */
624	if (fFlags == VHDIMAGEEXPAND_ALL_SUCCESS)
625	{
626	pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = RT_BE2H_U32(pExpand->idxBlockBe);
627	RTMemFree(pExpand);
628	}
629	else
630	{
631	uint32_t uStatus;
632
633	uStatus = VHDIMAGEEXPAND_STATUS_GET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT);
634	if ( uStatus == VHDIMAGEEXPAND_STEP_FAILED
635	\|\| uStatus == VHDIMAGEEXPAND_STEP_SUCCESS)
636	{
637	/* Undo and restore the old value. */
638	pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = ~0U;
639
640	/* Restore the old value on the disk.
641	* No need for a completion callback because we can't
642	* do anything if this fails. */
643	if (uStatus == VHDIMAGEEXPAND_STEP_SUCCESS)
644	{
645	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
646	pImage->uBlockAllocationTableOffset
647	+ pExpand->idxBatAllocated * sizeof(uint32_t),
648	&pImage->pBlockAllocationTable[pExpand->idxBatAllocated],
649	sizeof(uint32_t), pIoCtx, NULL, NULL);
650	fIoInProgress \|= rc == VERR_VD_ASYNC_IO_IN_PROGRESS;
651	}
652	}
653
654	/* Restore old size (including the footer because another application might
655	* fill up the free space making it impossible to add the footer)
656	* and add the footer at the right place again. */
657	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
658	pExpand->cbEofOld + sizeof(VHDFooter));
659	AssertRC(rc);
660
661	pImage->uCurrentEndOfFile = pExpand->cbEofOld;
662	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
663	pImage->uCurrentEndOfFile,
664	&pImage->vhdFooterCopy, sizeof(VHDFooter),
665	pIoCtx, NULL, NULL);
666	fIoInProgress \|= rc == VERR_VD_ASYNC_IO_IN_PROGRESS;
667	}
668
669	return fIoInProgress ? VERR_VD_ASYNC_IO_IN_PROGRESS : rc;
670	}
671
672	static int vhdAsyncExpansionStepCompleted(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq, unsigned iStep)
673	{
674	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
675	PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)pvUser;
676
677	LogFlowFunc(("pBackendData=%#p pIoCtx=%#p pvUser=%#p rcReq=%Rrc iStep=%u\n",
678	pBackendData, pIoCtx, pvUser, rcReq, iStep));
679
680	if (RT_SUCCESS(rcReq))
681	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_SUCCESS);
682	else
683	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_FAILED);
684
685	if ((pExpand->fFlags & VHDIMAGEEXPAND_ALL_COMPLETE) == VHDIMAGEEXPAND_ALL_COMPLETE)
686	return vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand);
687
688	return VERR_VD_ASYNC_IO_IN_PROGRESS;
689	}
690
691	static int vhdAsyncExpansionDataBlockBitmapComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
692	{
693	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT);
694	}
695
696	static int vhdAsyncExpansionDataComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
697	{
698	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT);
699	}
700
701	static int vhdAsyncExpansionBatUpdateComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
702	{
703	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BAT_STATUS_SHIFT);
704	}
705
706	static int vhdAsyncExpansionFooterUpdateComplete(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
707	{
708	return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT);
709	}
710
711	static int vhdLoadDynamicDisk(PVHDIMAGE pImage, uint64_t uDynamicDiskHeaderOffset)
712	{
713	VHDDynamicDiskHeader vhdDynamicDiskHeader;
714	int rc = VINF_SUCCESS;
715	uint32_t *pBlockAllocationTable;
716	uint64_t uBlockAllocationTableOffset;
717	unsigned i = 0;
718
719	Log(("Open a dynamic disk.\n"));
720
721	/*
722	* Read the dynamic disk header.
723	*/
724	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, uDynamicDiskHeaderOffset,
725	&vhdDynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
726	if (memcmp(vhdDynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE))
727	return VERR_INVALID_PARAMETER;
728
729	pImage->cbDataBlock = RT_BE2H_U32(vhdDynamicDiskHeader.BlockSize);
730	LogFlowFunc(("BlockSize=%u\n", pImage->cbDataBlock));
731	pImage->cBlockAllocationTableEntries = RT_BE2H_U32(vhdDynamicDiskHeader.MaxTableEntries);
732	LogFlowFunc(("MaxTableEntries=%lu\n", pImage->cBlockAllocationTableEntries));
733	AssertMsg(!(pImage->cbDataBlock % VHD_SECTOR_SIZE), ("%s: Data block size is not a multiple of %!\n", __FUNCTION__, VHD_SECTOR_SIZE));
734
735	pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE;
736	LogFlowFunc(("SectorsPerDataBlock=%u\n", pImage->cSectorsPerDataBlock));
737
738	/*
739	* Every block starts with a bitmap indicating which sectors are valid and which are not.
740	* We store the size of it to be able to calculate the real offset.
741	*/
742	pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8;
743	pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE;
744	/* Round up to full sector size */
745	if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0)
746	pImage->cDataBlockBitmapSectors++;
747	LogFlowFunc(("cbDataBlockBitmap=%u\n", pImage->cbDataBlockBitmap));
748	LogFlowFunc(("cDataBlockBitmapSectors=%u\n", pImage->cDataBlockBitmapSectors));
749
750	pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage);
751	if (!pImage->pu8Bitmap)
752	return VERR_NO_MEMORY;
753
754	pBlockAllocationTable = (uint32_t )RTMemAllocZ(pImage->cBlockAllocationTableEntries sizeof(uint32_t));
755	if (!pBlockAllocationTable)
756	return VERR_NO_MEMORY;
757
758	/*
759	* Read the table.
760	*/
761	uBlockAllocationTableOffset = RT_BE2H_U64(vhdDynamicDiskHeader.TableOffset);
762	LogFlowFunc(("uBlockAllocationTableOffset=%llu\n", uBlockAllocationTableOffset));
763	pImage->uBlockAllocationTableOffset = uBlockAllocationTableOffset;
764	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
765	uBlockAllocationTableOffset, pBlockAllocationTable,
766	pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
767
768	/*
769	* Because the offset entries inside the allocation table are stored big endian
770	* we need to convert them into host endian.
771	*/
772	pImage->pBlockAllocationTable = (uint32_t )RTMemAllocZ(pImage->cBlockAllocationTableEntries sizeof(uint32_t));
773	if (!pImage->pBlockAllocationTable)
774	{
775	RTMemFree(pBlockAllocationTable);
776	return VERR_NO_MEMORY;
777	}
778
779	for (i = 0; i < pImage->cBlockAllocationTableEntries; i++)
780	pImage->pBlockAllocationTable[i] = RT_BE2H_U32(pBlockAllocationTable[i]);
781
782	RTMemFree(pBlockAllocationTable);
783
784	if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF)
785	memcpy(pImage->ParentUuid.au8, vhdDynamicDiskHeader.ParentUuid, sizeof(pImage->ParentUuid));
786
787	return rc;
788	}
789
790	static int vhdOpenImage(PVHDIMAGE pImage, unsigned uOpenFlags)
791	{
792	uint64_t FileSize;
793	VHDFooter vhdFooter;
794
795	pImage->uOpenFlags = uOpenFlags;
796
797	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
798	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
799	AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
800
801	/*
802	* Open the image.
803	*/
804	int rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
805	VDOpenFlagsToFileOpenFlags(uOpenFlags,
806	false /* fCreate */),
807	&pImage->pStorage);
808	if (RT_FAILURE(rc))
809	{
810	/* Do NOT signal an appropriate error here, as the VD layer has the
811	* choice of retrying the open if it failed. */
812	return rc;
813	}
814
815	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &FileSize);
816	pImage->uCurrentEndOfFile = FileSize - sizeof(VHDFooter);
817
818	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile,
819	&vhdFooter, sizeof(VHDFooter));
820	if (RT_SUCCESS(rc))
821	{
822	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
823	{
824	/*
825	* There is also a backup header at the beginning in case the image got corrupted.
826	* Such corrupted images are detected here to let the open handler repair it later.
827	*/
828	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0,
829	&vhdFooter, sizeof(VHDFooter));
830	if (RT_SUCCESS(rc))
831	{
832	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
833	rc = VERR_VD_VHD_INVALID_HEADER;
834	else
835	rc = VERR_VD_IMAGE_CORRUPTED;
836	}
837	}
838	}
839
840	if (RT_FAILURE(rc))
841	return rc;
842
843	switch (RT_BE2H_U32(vhdFooter.DiskType))
844	{
845	case VHD_FOOTER_DISK_TYPE_FIXED:
846	pImage->uImageFlags \|= VD_IMAGE_FLAGS_FIXED;
847	break;
848	case VHD_FOOTER_DISK_TYPE_DYNAMIC:
849	pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED;
850	break;
851	case VHD_FOOTER_DISK_TYPE_DIFFERENCING:
852	pImage->uImageFlags \|= VD_IMAGE_FLAGS_DIFF;
853	pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED;
854	break;
855	default:
856	return VERR_NOT_IMPLEMENTED;
857	}
858
859	pImage->cbSize = RT_BE2H_U64(vhdFooter.CurSize);
860	pImage->LCHSGeometry.cCylinders = 0;
861	pImage->LCHSGeometry.cHeads = 0;
862	pImage->LCHSGeometry.cSectors = 0;
863	pImage->PCHSGeometry.cCylinders = RT_BE2H_U16(vhdFooter.DiskGeometryCylinder);
864	pImage->PCHSGeometry.cHeads = vhdFooter.DiskGeometryHeads;
865	pImage->PCHSGeometry.cSectors = vhdFooter.DiskGeometrySectors;
866
867	/*
868	* Copy of the disk footer.
869	* If we allocate new blocks in differencing disks on write access
870	* the footer is overwritten. We need to write it at the end of the file.
871	*/
872	memcpy(&pImage->vhdFooterCopy, &vhdFooter, sizeof(VHDFooter));
873
874	/*
875	* Is there a better way?
876	*/
877	memcpy(&pImage->ImageUuid, &vhdFooter.UniqueID, 16);
878
879	pImage->u64DataOffset = RT_BE2H_U64(vhdFooter.DataOffset);
880	LogFlowFunc(("DataOffset=%llu\n", pImage->u64DataOffset));
881
882	if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
883	rc = vhdLoadDynamicDisk(pImage, pImage->u64DataOffset);
884
885	if (RT_FAILURE(rc))
886	vhdFreeImage(pImage, false);
887	return rc;
888	}
889
890	/**
891	* Internal: Checks if a sector in the block bitmap is set
892	*/
893	DECLINLINE(bool) vhdBlockBitmapSectorContainsData(PVHDIMAGE pImage, uint32_t cBlockBitmapEntry)
894	{
895	uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */
896
897	/*
898	* The index of the bit in the byte of the data block bitmap.
899	* The most significant bit stands for a lower sector number.
900	*/
901	uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8);
902	uint8_t *puBitmap = pImage->pu8Bitmap + iBitmap;
903
904	AssertMsg(puBitmap < (pImage->pu8Bitmap + pImage->cbDataBlockBitmap),
905	("VHD: Current bitmap position exceeds maximum size of the bitmap\n"));
906
907	return ((*puBitmap) & RT_BIT(iBitInByte)) != 0;
908	}
909
910	/**
911	* Internal: Sets the given sector in the sector bitmap.
912	*/
913	DECLINLINE(bool) vhdBlockBitmapSectorSet(PVHDIMAGE pImage, uint8_t *pu8Bitmap, uint32_t cBlockBitmapEntry)
914	{
915	uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */
916
917	/*
918	* The index of the bit in the byte of the data block bitmap.
919	* The most significant bit stands for a lower sector number.
920	*/
921	uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8);
922	uint8_t *puBitmap = pu8Bitmap + iBitmap;
923
924	AssertMsg(puBitmap < (pu8Bitmap + pImage->cbDataBlockBitmap),
925	("VHD: Current bitmap position exceeds maximum size of the bitmap\n"));
926
927	bool fClear = ((*puBitmap) & RT_BIT(iBitInByte)) == 0;
928	*puBitmap \|= RT_BIT(iBitInByte);
929	return fClear;
930	}
931
932	/**
933	* Internal: Derive drive geometry from its size.
934	*/
935	static void vhdSetDiskGeometry(PVHDIMAGE pImage, uint64_t cbSize)
936	{
937	uint64_t u64TotalSectors = cbSize / VHD_SECTOR_SIZE;
938	uint32_t u32CylinderTimesHeads, u32Heads, u32SectorsPerTrack;
939
940	if (u64TotalSectors > 65535 * 16 * 255)
941	{
942	/* ATA disks limited to 127 GB. */
943	u64TotalSectors = 65535 * 16 * 255;
944	}
945
946	if (u64TotalSectors >= 65535 * 16 * 63)
947	{
948	u32SectorsPerTrack = 255;
949	u32Heads = 16;
950	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
951	}
952	else
953	{
954	u32SectorsPerTrack = 17;
955	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
956
957	u32Heads = (u32CylinderTimesHeads + 1023) / 1024;
958
959	if (u32Heads < 4)
960	{
961	u32Heads = 4;
962	}
963	if (u32CylinderTimesHeads >= (u32Heads * 1024) \|\| u32Heads > 16)
964	{
965	u32SectorsPerTrack = 31;
966	u32Heads = 16;
967	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
968	}
969	if (u32CylinderTimesHeads >= (u32Heads * 1024))
970	{
971	u32SectorsPerTrack = 63;
972	u32Heads = 16;
973	u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack;
974	}
975	}
976	pImage->PCHSGeometry.cCylinders = u32CylinderTimesHeads / u32Heads;
977	pImage->PCHSGeometry.cHeads = u32Heads;
978	pImage->PCHSGeometry.cSectors = u32SectorsPerTrack;
979	pImage->LCHSGeometry.cCylinders = 0;
980	pImage->LCHSGeometry.cHeads = 0;
981	pImage->LCHSGeometry.cSectors = 0;
982	}
983
984
985	static uint32_t vhdAllocateParentLocators(PVHDIMAGE pImage, VHDDynamicDiskHeader *pDDH, uint64_t u64Offset)
986	{
987	PVHDPLE pLocator = pDDH->ParentLocatorEntry;
988
989	/*
990	* The VHD spec states that the DataSpace field holds the number of sectors
991	* required to store the parent locator path.
992	* As it turned out VPC and Hyper-V store the amount of bytes reserved for the
993	* path and not the number of sectors.
994	*/
995
996	/* Unicode absolute Windows path. */
997	pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2KU);
998	pLocator->u32DataSpace = RT_H2BE_U32(VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16));
999	pLocator->u64DataOffset = RT_H2BE_U64(u64Offset);
1000	pLocator++;
1001	u64Offset += VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16);
1002	/* Unicode relative Windows path. */
1003	pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2RU);
1004	pLocator->u32DataSpace = RT_H2BE_U32(VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16));
1005	pLocator->u64DataOffset = RT_H2BE_U64(u64Offset);
1006	u64Offset += VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16);
1007	return u64Offset;
1008	}
1009
1010	/**
1011	* Internal: Additional code for dynamic VHD image creation.
1012	*/
1013	static int vhdCreateDynamicImage(PVHDIMAGE pImage, uint64_t cbSize)
1014	{
1015	int rc;
1016	VHDDynamicDiskHeader DynamicDiskHeader;
1017	uint32_t u32BlockAllocationTableSectors;
1018	void *pvTmp = NULL;
1019
1020	memset(&DynamicDiskHeader, 0, sizeof(DynamicDiskHeader));
1021
1022	pImage->u64DataOffset = sizeof(VHDFooter);
1023	pImage->cbDataBlock = VHD_BLOCK_SIZE; /* 2 MB */
1024	pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE;
1025	pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8;
1026	pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE;
1027	/* Align to sector boundary */
1028	if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0)
1029	pImage->cDataBlockBitmapSectors++;
1030	pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage);
1031	if (!pImage->pu8Bitmap)
1032	return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for bitmap storage"));
1033
1034	/* Initialize BAT. */
1035	pImage->uBlockAllocationTableOffset = (uint64_t)sizeof(VHDFooter) + sizeof(VHDDynamicDiskHeader);
1036	pImage->cBlockAllocationTableEntries = (uint32_t)((cbSize + pImage->cbDataBlock - 1) / pImage->cbDataBlock); /* Align table to the block size. */
1037	u32BlockAllocationTableSectors = (pImage->cBlockAllocationTableEntries * sizeof(uint32_t) + VHD_SECTOR_SIZE - 1) / VHD_SECTOR_SIZE;
1038	pImage->pBlockAllocationTable = (uint32_t )RTMemAllocZ(pImage->cBlockAllocationTableEntries sizeof(uint32_t));
1039	if (!pImage->pBlockAllocationTable)
1040	return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for BAT"));
1041
1042	for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++)
1043	{
1044	pImage->pBlockAllocationTable[i] = 0xFFFFFFFF; /* It is actually big endian. */
1045	}
1046
1047	/* Round up to the sector size. */
1048	if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF) /* fix hyper-v unreadable error */
1049	pImage->uCurrentEndOfFile = vhdAllocateParentLocators(pImage, &DynamicDiskHeader,
1050	pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE);
1051	else
1052	pImage->uCurrentEndOfFile = pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE;
1053
1054	/* Set dynamic image size. */
1055	pvTmp = RTMemTmpAllocZ(pImage->uCurrentEndOfFile + sizeof(VHDFooter));
1056	if (!pvTmp)
1057	return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
1058
1059	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, pvTmp,
1060	pImage->uCurrentEndOfFile + sizeof(VHDFooter));
1061	if (RT_FAILURE(rc))
1062	{
1063	RTMemTmpFree(pvTmp);
1064	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
1065	}
1066
1067	RTMemTmpFree(pvTmp);
1068
1069	/* Initialize and write the dynamic disk header. */
1070	memcpy(DynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, sizeof(DynamicDiskHeader.Cookie));
1071	DynamicDiskHeader.DataOffset = UINT64_C(0xFFFFFFFFFFFFFFFF); /* Initially the disk has no data. */
1072	DynamicDiskHeader.TableOffset = RT_H2BE_U64(pImage->uBlockAllocationTableOffset);
1073	DynamicDiskHeader.HeaderVersion = RT_H2BE_U32(VHD_DYNAMIC_DISK_HEADER_VERSION);
1074	DynamicDiskHeader.BlockSize = RT_H2BE_U32(pImage->cbDataBlock);
1075	DynamicDiskHeader.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries);
1076	/* Compute and update checksum. */
1077	DynamicDiskHeader.Checksum = 0;
1078	DynamicDiskHeader.Checksum = RT_H2BE_U32(vhdChecksum(&DynamicDiskHeader, sizeof(DynamicDiskHeader)));
1079
1080	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VHDFooter),
1081	&DynamicDiskHeader, sizeof(DynamicDiskHeader));
1082	if (RT_FAILURE(rc))
1083	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write dynamic disk header to image '%s'"), pImage->pszFilename);
1084
1085	/* Write BAT. */
1086	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset,
1087	pImage->pBlockAllocationTable,
1088	pImage->cBlockAllocationTableEntries * sizeof(uint32_t));
1089	if (RT_FAILURE(rc))
1090	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write BAT to image '%s'"), pImage->pszFilename);
1091
1092	return rc;
1093	}
1094
1095	/**
1096	* Internal: The actual code for VHD image creation, both fixed and dynamic.
1097	*/
1098	static int vhdCreateImage(PVHDIMAGE pImage, uint64_t cbSize,
1099	unsigned uImageFlags, const char *pszComment,
1100	PCVDGEOMETRY pPCHSGeometry,
1101	PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid,
1102	unsigned uOpenFlags,
1103	PFNVDPROGRESS pfnProgress, void *pvUser,
1104	unsigned uPercentStart, unsigned uPercentSpan)
1105	{
1106	int rc;
1107	VHDFooter Footer;
1108	RTTIMESPEC now;
1109
1110	pImage->uOpenFlags = uOpenFlags;
1111	pImage->uImageFlags = uImageFlags;
1112
1113	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
1114
1115	rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
1116	VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY,
1117	true /* fCreate */),
1118	&pImage->pStorage);
1119	if (RT_FAILURE(rc))
1120	return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot create image '%s'"), pImage->pszFilename);
1121
1122
1123	pImage->cbSize = cbSize;
1124	pImage->ImageUuid = *pUuid;
1125	RTUuidClear(&pImage->ParentUuid);
1126	vhdSetDiskGeometry(pImage, cbSize);
1127
1128	/* Initialize the footer. */
1129	memset(&Footer, 0, sizeof(Footer));
1130	memcpy(Footer.Cookie, VHD_FOOTER_COOKIE, sizeof(Footer.Cookie));
1131	Footer.Features = RT_H2BE_U32(0x2);
1132	Footer.Version = RT_H2BE_U32(VHD_FOOTER_FILE_FORMAT_VERSION);
1133	Footer.TimeStamp = RT_H2BE_U32(vhdRtTime2VhdTime(RTTimeNow(&now)));
1134	memcpy(Footer.CreatorApp, "vbox", sizeof(Footer.CreatorApp));
1135	Footer.CreatorVer = RT_H2BE_U32(VBOX_VERSION);
1136	#ifdef RT_OS_DARWIN
1137	Footer.CreatorOS = RT_H2BE_U32(0x4D616320); /* "Mac " */
1138	#else /* Virtual PC supports only two platforms atm, so everything else will be Wi2k. */
1139	Footer.CreatorOS = RT_H2BE_U32(0x5769326B); /* "Wi2k" */
1140	#endif
1141	Footer.OrigSize = RT_H2BE_U64(cbSize);
1142	Footer.CurSize = Footer.OrigSize;
1143	Footer.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders);
1144	Footer.DiskGeometryHeads = pImage->PCHSGeometry.cHeads;
1145	Footer.DiskGeometrySectors = pImage->PCHSGeometry.cSectors;
1146	memcpy(Footer.UniqueID, pImage->ImageUuid.au8, sizeof(Footer.UniqueID));
1147	Footer.SavedState = 0;
1148
1149	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
1150	{
1151	Footer.DiskType = RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_FIXED);
1152	/*
1153	* Initialize fixed image.
1154	* "The size of the entire file is the size of the hard disk in
1155	* the guest operating system plus the size of the footer."
1156	*/
1157	pImage->u64DataOffset = VHD_FOOTER_DATA_OFFSET_FIXED;
1158	pImage->uCurrentEndOfFile = cbSize;
1159	/** @todo r=klaus replace this with actual data writes, see the experience
1160	* with VDI files on Windows, can cause long freezes when writing. */
1161	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
1162	pImage->uCurrentEndOfFile + sizeof(VHDFooter));
1163	if (RT_FAILURE(rc))
1164	{
1165	vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename);
1166	goto out;
1167	}
1168	}
1169	else
1170	{
1171	/*
1172	* Initialize dynamic image.
1173	*
1174	* The overall structure of dynamic disk is:
1175	*
1176	* [Copy of hard disk footer (512 bytes)]
1177	* [Dynamic disk header (1024 bytes)]
1178	* [BAT (Block Allocation Table)]
1179	* [Parent Locators]
1180	* [Data block 1]
1181	* [Data block 2]
1182	* ...
1183	* [Data block N]
1184	* [Hard disk footer (512 bytes)]
1185	*/
1186	Footer.DiskType = (uImageFlags & VD_IMAGE_FLAGS_DIFF)
1187	? RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DIFFERENCING)
1188	: RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DYNAMIC);
1189	/* We are half way thorough with creation of image, let the caller know. */
1190	if (pfnProgress)
1191	pfnProgress(pvUser, (uPercentStart + uPercentSpan) / 2);
1192
1193	rc = vhdCreateDynamicImage(pImage, cbSize);
1194	if (RT_FAILURE(rc))
1195	goto out;
1196	}
1197
1198	Footer.DataOffset = RT_H2BE_U64(pImage->u64DataOffset);
1199
1200	/* Compute and update the footer checksum. */
1201	Footer.Checksum = 0;
1202	Footer.Checksum = RT_H2BE_U32(vhdChecksum(&Footer, sizeof(Footer)));
1203
1204	pImage->vhdFooterCopy = Footer;
1205
1206	/* Store the footer */
1207	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile,
1208	&Footer, sizeof(Footer));
1209	if (RT_FAILURE(rc))
1210	{
1211	vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write footer to image '%s'"), pImage->pszFilename);
1212	goto out;
1213	}
1214
1215	/* Dynamic images contain a copy of the footer at the very beginning of the file. */
1216	if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
1217	{
1218	/* Write the copy of the footer. */
1219	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Footer, sizeof(Footer));
1220	if (RT_FAILURE(rc))
1221	{
1222	vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write a copy of footer to image '%s'"), pImage->pszFilename);
1223	goto out;
1224	}
1225	}
1226
1227	out:
1228	if (RT_SUCCESS(rc) && pfnProgress)
1229	pfnProgress(pvUser, uPercentStart + uPercentSpan);
1230
1231	if (RT_FAILURE(rc))
1232	vhdFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
1233	return rc;
1234	}
1235
1236
1237	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
1238	static int vhdCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1239	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
1240	{
1241	LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
1242	int rc;
1243	PVDIOSTORAGE pStorage;
1244	uint64_t cbFile;
1245	VHDFooter vhdFooter;
1246
1247	PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage);
1248	AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
1249
1250	rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
1251	VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY,
1252	false /* fCreate */),
1253	&pStorage);
1254	if (RT_FAILURE(rc))
1255	goto out;
1256
1257	rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
1258	if (RT_FAILURE(rc))
1259	{
1260	vdIfIoIntFileClose(pIfIo, pStorage);
1261	rc = VERR_VD_VHD_INVALID_HEADER;
1262	goto out;
1263	}
1264
1265	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter),
1266	&vhdFooter, sizeof(VHDFooter));
1267	if (RT_SUCCESS(rc))
1268	{
1269	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
1270	{
1271	/*
1272	* There is also a backup header at the beginning in case the image got corrupted.
1273	* Such corrupted images are detected here to let the open handler repair it later.
1274	*/
1275	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &vhdFooter, sizeof(VHDFooter));
1276	if ( RT_FAILURE(rc)
1277	\|\| (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0))
1278	rc = VERR_VD_VHD_INVALID_HEADER;
1279	}
1280
1281	if (RT_SUCCESS(rc))
1282	*penmType = VDTYPE_HDD;
1283	}
1284	else
1285	rc = VERR_VD_VHD_INVALID_HEADER;
1286
1287	vdIfIoIntFileClose(pIfIo, pStorage);
1288
1289	out:
1290	LogFlowFunc(("returns %Rrc\n", rc));
1291	return rc;
1292	}
1293
1294	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1295	static int vhdOpen(const char *pszFilename, unsigned uOpenFlags,
1296	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1297	VDTYPE enmType, void **ppBackendData)
1298	{
1299	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
1300	int rc = VINF_SUCCESS;
1301	PVHDIMAGE pImage;
1302
1303	NOREF(enmType); /*< @todo r=klaus make use of the type info. /
1304
1305	/* Check open flags. All valid flags are supported. */
1306	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1307	{
1308	rc = VERR_INVALID_PARAMETER;
1309	goto out;
1310	}
1311
1312	/* Check remaining arguments. */
1313	if ( !VALID_PTR(pszFilename)
1314	\|\| !*pszFilename)
1315	{
1316	rc = VERR_INVALID_PARAMETER;
1317	goto out;
1318	}
1319
1320	pImage = (PVHDIMAGE)RTMemAllocZ(sizeof(VHDIMAGE));
1321	if (!pImage)
1322	{
1323	rc = VERR_NO_MEMORY;
1324	goto out;
1325	}
1326
1327	pImage->pszFilename = pszFilename;
1328	pImage->pStorage = NULL;
1329	pImage->pVDIfsDisk = pVDIfsDisk;
1330	pImage->pVDIfsImage = pVDIfsImage;
1331
1332	rc = vhdOpenImage(pImage, uOpenFlags);
1333	if (RT_SUCCESS(rc))
1334	*ppBackendData = pImage;
1335	else
1336	RTMemFree(pImage);
1337
1338	out:
1339	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1340	return rc;
1341	}
1342
1343	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1344	static int vhdCreate(const char *pszFilename, uint64_t cbSize,
1345	unsigned uImageFlags, const char *pszComment,
1346	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1347	PCRTUUID pUuid, unsigned uOpenFlags,
1348	unsigned uPercentStart, unsigned uPercentSpan,
1349	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1350	PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
1351	void **ppBackendData)
1352	{
1353	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",
1354	pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
1355	int rc = VINF_SUCCESS;
1356	PVHDIMAGE pImage;
1357
1358	PFNVDPROGRESS pfnProgress = NULL;
1359	void *pvUser = NULL;
1360	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
1361	if (pIfProgress)
1362	{
1363	pfnProgress = pIfProgress->pfnProgress;
1364	pvUser = pIfProgress->Core.pvUser;
1365	}
1366
1367	/* Check the VD container type. */
1368	if (enmType != VDTYPE_HDD)
1369	{
1370	rc = VERR_VD_INVALID_TYPE;
1371	goto out;
1372	}
1373
1374	/* Check open flags. All valid flags are supported. */
1375	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1376	{
1377	rc = VERR_INVALID_PARAMETER;
1378	return rc;
1379	}
1380
1381	/* @todo Check the values of other params */
1382
1383	pImage = (PVHDIMAGE)RTMemAllocZ(sizeof(VHDIMAGE));
1384	if (!pImage)
1385	{
1386	rc = VERR_NO_MEMORY;
1387	return rc;
1388	}
1389	pImage->pszFilename = pszFilename;
1390	pImage->pStorage = NULL;
1391	pImage->pVDIfsDisk = pVDIfsDisk;
1392	pImage->pVDIfsImage = pVDIfsImage;
1393
1394	/* Get I/O interface. */
1395	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
1396	if (RT_UNLIKELY(!VALID_PTR(pImage->pIfIo)))
1397	{
1398	RTMemFree(pImage);
1399	return VERR_INVALID_PARAMETER;
1400	}
1401
1402	rc = vhdCreateImage(pImage, cbSize, uImageFlags, pszComment,
1403	pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags,
1404	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1405
1406	if (RT_SUCCESS(rc))
1407	{
1408	/* So far the image is opened in read/write mode. Make sure the
1409	* image is opened in read-only mode if the caller requested that. */
1410	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1411	{
1412	vhdFreeImage(pImage, false);
1413	rc = vhdOpenImage(pImage, uOpenFlags);
1414	if (RT_FAILURE(rc))
1415	{
1416	RTMemFree(pImage);
1417	goto out;
1418	}
1419	}
1420	*ppBackendData = pImage;
1421	}
1422	else
1423	RTMemFree(pImage);
1424
1425	out:
1426	LogFlowFunc(("returns %Rrc\n", rc));
1427	return rc;
1428	}
1429
1430	/** @copydoc VBOXHDDBACKEND::pfnRename */
1431	static int vhdRename(void pBackendData, const char pszFilename)
1432	{
1433	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1434	int rc = VINF_SUCCESS;
1435	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1436
1437	/* Check arguments. */
1438	if ( !pImage
1439	\|\| !pszFilename
1440	\|\| !*pszFilename)
1441	{
1442	rc = VERR_INVALID_PARAMETER;
1443	goto out;
1444	}
1445
1446	/* Close the image. */
1447	rc = vhdFreeImage(pImage, false);
1448	if (RT_FAILURE(rc))
1449	goto out;
1450
1451	/* Rename the file. */
1452	rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
1453	if (RT_FAILURE(rc))
1454	{
1455	/* The move failed, try to reopen the original image. */
1456	int rc2 = vhdOpenImage(pImage, pImage->uOpenFlags);
1457	if (RT_FAILURE(rc2))
1458	rc = rc2;
1459
1460	goto out;
1461	}
1462
1463	/* Update pImage with the new information. */
1464	pImage->pszFilename = pszFilename;
1465
1466	/* Open the old file with new name. */
1467	rc = vhdOpenImage(pImage, pImage->uOpenFlags);
1468	if (RT_FAILURE(rc))
1469	goto out;
1470
1471	out:
1472	LogFlowFunc(("returns %Rrc\n", rc));
1473	return rc;
1474	}
1475
1476	/** @copydoc VBOXHDDBACKEND::pfnClose */
1477	static int vhdClose(void *pBackendData, bool fDelete)
1478	{
1479	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1480	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1481	int rc;
1482
1483	rc = vhdFreeImage(pImage, fDelete);
1484	RTMemFree(pImage);
1485
1486	LogFlowFunc(("returns %Rrc\n", rc));
1487	return rc;
1488	}
1489
1490	/** @copydoc VBOXHDDBACKEND::pfnRead */
1491	static int vhdRead(void *pBackendData, uint64_t uOffset, size_t cbRead,
1492	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
1493	{
1494	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1495	int rc = VINF_SUCCESS;
1496
1497	LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbRead=%u pcbActuallyRead=%p\n", pBackendData, uOffset, pIoCtx, cbRead, pcbActuallyRead));
1498
1499	if (uOffset + cbRead > pImage->cbSize)
1500	return VERR_INVALID_PARAMETER;
1501
1502	/*
1503	* If we have a dynamic disk image, we need to find the data block and sector to read.
1504	*/
1505	if (pImage->pBlockAllocationTable)
1506	{
1507	/*
1508	* Get the data block first.
1509	*/
1510	uint32_t cBlockAllocationTableEntry = (uOffset / VHD_SECTOR_SIZE) / pImage->cSectorsPerDataBlock;
1511	uint32_t cBATEntryIndex = (uOffset / VHD_SECTOR_SIZE) % pImage->cSectorsPerDataBlock;
1512	uint64_t uVhdOffset;
1513
1514	LogFlowFunc(("cBlockAllocationTableEntry=%u cBatEntryIndex=%u\n", cBlockAllocationTableEntry, cBATEntryIndex));
1515	LogFlowFunc(("BlockAllocationEntry=%u\n", pImage->pBlockAllocationTable[cBlockAllocationTableEntry]));
1516
1517	/*
1518	* Clip read range to remain in this data block.
1519	*/
1520	cbRead = RT_MIN(cbRead, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE)));
1521
1522	/*
1523	* If the block is not allocated the content of the entry is ~0
1524	*/
1525	if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U)
1526	rc = VERR_VD_BLOCK_FREE;
1527	else
1528	{
1529	uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE;
1530	LogFlowFunc(("uVhdOffset=%llu cbRead=%u\n", uVhdOffset, cbRead));
1531
1532	/* Read in the block's bitmap. */
1533	PVDMETAXFER pMetaXfer;
1534	rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
1535	((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
1536	pImage->pu8Bitmap, pImage->cbDataBlockBitmap,
1537	pIoCtx, &pMetaXfer, NULL, NULL);
1538
1539	if (RT_SUCCESS(rc))
1540	{
1541	uint32_t cSectors = 0;
1542
1543	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
1544	if (vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
1545	{
1546	cBATEntryIndex++;
1547	cSectors = 1;
1548
1549	/*
1550	* The first sector being read is marked dirty, read as much as we
1551	* can from child. Note that only sectors that are marked dirty
1552	* must be read from child.
1553	*/
1554	while ( (cSectors < (cbRead / VHD_SECTOR_SIZE))
1555	&& vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
1556	{
1557	cBATEntryIndex++;
1558	cSectors++;
1559	}
1560
1561	cbRead = cSectors * VHD_SECTOR_SIZE;
1562
1563	LogFlowFunc(("uVhdOffset=%llu cbRead=%u\n", uVhdOffset, cbRead));
1564	rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage,
1565	uVhdOffset, pIoCtx, cbRead);
1566	}
1567	else
1568	{
1569	/*
1570	* The first sector being read is marked clean, so we should read from
1571	* our parent instead, but only as much as there are the following
1572	* clean sectors, because the block may still contain dirty sectors
1573	* further on. We just need to compute the number of clean sectors
1574	* and pass it to our caller along with the notification that they
1575	* should be read from the parent.
1576	*/
1577	cBATEntryIndex++;
1578	cSectors = 1;
1579
1580	while ( (cSectors < (cbRead / VHD_SECTOR_SIZE))
1581	&& !vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex))
1582	{
1583	cBATEntryIndex++;
1584	cSectors++;
1585	}
1586
1587	cbRead = cSectors * VHD_SECTOR_SIZE;
1588	LogFunc(("Sectors free: uVhdOffset=%llu cbRead=%u\n", uVhdOffset, cbRead));
1589	rc = VERR_VD_BLOCK_FREE;
1590	}
1591	}
1592	else
1593	AssertMsg(rc == VERR_VD_NOT_ENOUGH_METADATA, ("Reading block bitmap failed rc=%Rrc\n", rc));
1594	}
1595	}
1596	else
1597	rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, uOffset, pIoCtx, cbRead);
1598
1599	if (pcbActuallyRead)
1600	*pcbActuallyRead = cbRead;
1601
1602	LogFlowFunc(("returns rc=%Rrc\n", rc));
1603	return rc;
1604	}
1605
1606	/** @copydoc VBOXHDDBACKEND::pfnWrite */
1607	static int vhdWrite(void *pBackendData, uint64_t uOffset, size_t cbWrite,
1608	PVDIOCTX pIoCtx, size_t pcbWriteProcess, size_t pcbPreRead,
1609	size_t *pcbPostRead, unsigned fWrite)
1610	{
1611	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1612	int rc = VINF_SUCCESS;
1613
1614	LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
1615	pBackendData, uOffset, pIoCtx, cbWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
1616
1617	AssertPtr(pImage);
1618	Assert(uOffset % VHD_SECTOR_SIZE == 0);
1619	Assert(cbWrite % VHD_SECTOR_SIZE == 0);
1620
1621	if (pImage->pBlockAllocationTable)
1622	{
1623	/*
1624	* Get the data block first.
1625	*/
1626	uint32_t cSector = uOffset / VHD_SECTOR_SIZE;
1627	uint32_t cBlockAllocationTableEntry = cSector / pImage->cSectorsPerDataBlock;
1628	uint32_t cBATEntryIndex = cSector % pImage->cSectorsPerDataBlock;
1629	uint64_t uVhdOffset;
1630
1631	/*
1632	* Clip write range.
1633	*/
1634	cbWrite = RT_MIN(cbWrite, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE)));
1635
1636	/*
1637	* If the block is not allocated the content of the entry is ~0
1638	* and we need to allocate a new block. Note that while blocks are
1639	* allocated with a relatively big granularity, each sector has its
1640	* own bitmap entry, indicating whether it has been written or not.
1641	* So that means for the purposes of the higher level that the
1642	* granularity is invisible. This means there's no need to return
1643	* VERR_VD_BLOCK_FREE unless the block hasn't been allocated yet.
1644	*/
1645	if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U)
1646	{
1647	/* Check if the block allocation should be suppressed. */
1648	if ( (fWrite & VD_WRITE_NO_ALLOC)
1649	\|\| (cbWrite != pImage->cbDataBlock))
1650	{
1651	pcbPreRead = cBATEntryIndex VHD_SECTOR_SIZE;
1652	pcbPostRead = pImage->cSectorsPerDataBlock VHD_SECTOR_SIZE - cbWrite - *pcbPreRead;
1653
1654	if (pcbWriteProcess)
1655	*pcbWriteProcess = cbWrite;
1656	return VERR_VD_BLOCK_FREE;
1657	}
1658
1659	PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)RTMemAllocZ(RT_OFFSETOF(VHDIMAGEEXPAND, au8Bitmap[pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE]));
1660	bool fIoInProgress = false;
1661
1662	if (!pExpand)
1663	return VERR_NO_MEMORY;
1664
1665	pExpand->cbEofOld = pImage->uCurrentEndOfFile;
1666	pExpand->idxBatAllocated = cBlockAllocationTableEntry;
1667	pExpand->idxBlockBe = RT_H2BE_U32(pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE);
1668
1669	/* Set the bits for all sectors having been written. */
1670	for (uint32_t iSector = 0; iSector < (cbWrite / VHD_SECTOR_SIZE); iSector++)
1671	{
1672	/* No need to check for a changed value because this is an initial write. */
1673	vhdBlockBitmapSectorSet(pImage, pExpand->au8Bitmap, cBATEntryIndex);
1674	cBATEntryIndex++;
1675	}
1676
1677	do
1678	{
1679	/*
1680	* Start with the sector bitmap.
1681	*/
1682	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1683	pImage->uCurrentEndOfFile,
1684	pExpand->au8Bitmap,
1685	pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE, pIoCtx,
1686	vhdAsyncExpansionDataBlockBitmapComplete,
1687	pExpand);
1688	if (RT_SUCCESS(rc))
1689	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1690	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1691	fIoInProgress = true;
1692	else
1693	{
1694	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1695	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1696	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1697	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1698	break;
1699	}
1700
1701
1702	/*
1703	* Write the new block at the current end of the file.
1704	*/
1705	rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1706	pImage->uCurrentEndOfFile + (pImage->cDataBlockBitmapSectors + (cSector % pImage->cSectorsPerDataBlock)) * VHD_SECTOR_SIZE,
1707	pIoCtx, cbWrite,
1708	vhdAsyncExpansionDataComplete,
1709	pExpand);
1710	if (RT_SUCCESS(rc))
1711	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1712	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1713	fIoInProgress = true;
1714	else
1715	{
1716	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1717	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1718	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1719	break;
1720	}
1721
1722	/*
1723	* Write entry in the BAT.
1724	*/
1725	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1726	pImage->uBlockAllocationTableOffset + cBlockAllocationTableEntry * sizeof(uint32_t),
1727	&pExpand->idxBlockBe, sizeof(uint32_t), pIoCtx,
1728	vhdAsyncExpansionBatUpdateComplete,
1729	pExpand);
1730	if (RT_SUCCESS(rc))
1731	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1732	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1733	fIoInProgress = true;
1734	else
1735	{
1736	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1737	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1738	break;
1739	}
1740
1741	/*
1742	* Set the new end of the file and link the new block into the BAT.
1743	*/
1744	pImage->uCurrentEndOfFile += pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE + pImage->cbDataBlock;
1745
1746	/* Update the footer. */
1747	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1748	pImage->uCurrentEndOfFile,
1749	&pImage->vhdFooterCopy,
1750	sizeof(VHDFooter), pIoCtx,
1751	vhdAsyncExpansionFooterUpdateComplete,
1752	pExpand);
1753	if (RT_SUCCESS(rc))
1754	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS);
1755	else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1756	fIoInProgress = true;
1757	else
1758	{
1759	VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED);
1760	break;
1761	}
1762
1763	} while (0);
1764
1765	if (!fIoInProgress)
1766	vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand);
1767	else
1768	rc = VERR_VD_ASYNC_IO_IN_PROGRESS;
1769	}
1770	else
1771	{
1772	/*
1773	* Calculate the real offset in the file.
1774	*/
1775	uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE;
1776
1777	/* Read in the block's bitmap. */
1778	PVDMETAXFER pMetaXfer;
1779	rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
1780	((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
1781	pImage->pu8Bitmap,
1782	pImage->cbDataBlockBitmap, pIoCtx,
1783	&pMetaXfer, NULL, NULL);
1784	if (RT_SUCCESS(rc))
1785	{
1786	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
1787
1788	/* Write data. */
1789	rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1790	uVhdOffset, pIoCtx, cbWrite,
1791	NULL, NULL);
1792	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1793	{
1794	bool fChanged = false;
1795
1796	/* Set the bits for all sectors having been written. */
1797	for (uint32_t iSector = 0; iSector < (cbWrite / VHD_SECTOR_SIZE); iSector++)
1798	{
1799	fChanged \|= vhdBlockBitmapSectorSet(pImage, pImage->pu8Bitmap, cBATEntryIndex);
1800	cBATEntryIndex++;
1801	}
1802
1803	/* Only write the bitmap if it was changed. */
1804	if (fChanged)
1805	{
1806	/*
1807	* Write the bitmap back.
1808	*
1809	* @note We don't have a completion callback here because we
1810	* can't do anything if the write fails for some reason.
1811	* The error will propagated to the device/guest
1812	* by the generic VD layer already and we don't need
1813	* to rollback anything here.
1814	*/
1815	rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1816	((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE,
1817	pImage->pu8Bitmap,
1818	pImage->cbDataBlockBitmap,
1819	pIoCtx, NULL, NULL);
1820	}
1821	}
1822	}
1823	}
1824	}
1825	else
1826	rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1827	uOffset, pIoCtx, cbWrite, NULL, NULL);
1828
1829	if (pcbWriteProcess)
1830	*pcbWriteProcess = cbWrite;
1831
1832	/* Stay on the safe side. Do not run the risk of confusing the higher
1833	* level, as that can be pretty lethal to image consistency. */
1834	*pcbPreRead = 0;
1835	*pcbPostRead = 0;
1836
1837	return rc;
1838	}
1839
1840	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1841	static int vhdFlush(void *pBackendData, PVDIOCTX pIoCtx)
1842	{
1843	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1844
1845	/* No need to write anything here. Data is always updated on a write. */
1846	return vdIfIoIntFileFlush(pImage->pIfIo, pImage->pStorage, pIoCtx, NULL, NULL);
1847	}
1848
1849	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
1850	static unsigned vhdGetVersion(void *pBackendData)
1851	{
1852	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1853	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1854	unsigned ver = 0;
1855
1856	AssertPtr(pImage);
1857
1858	if (pImage)
1859	ver = 1; /*< @todo use correct version /
1860
1861	LogFlowFunc(("returns %u\n", ver));
1862	return ver;
1863	}
1864
1865	/** @copydoc VBOXHDDBACKEND::pfnGetSectorSize */
1866	static uint32_t vhdGetSectorSize(void *pBackendData)
1867	{
1868	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1869	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1870	uint32_t cb = 0;
1871
1872	AssertPtr(pImage);
1873
1874	if (pImage)
1875	cb = 512;
1876
1877	LogFlowFunc(("returns %zu\n", cb));
1878	return cb;
1879	}
1880
1881	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
1882	static uint64_t vhdGetSize(void *pBackendData)
1883	{
1884	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1885	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1886	uint64_t cb = 0;
1887
1888	AssertPtr(pImage);
1889
1890	if (pImage && pImage->pStorage)
1891	cb = pImage->cbSize;
1892
1893	LogFlowFunc(("returns %llu\n", cb));
1894	return cb;
1895	}
1896
1897	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
1898	static uint64_t vhdGetFileSize(void *pBackendData)
1899	{
1900	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1901	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1902	uint64_t cb = 0;
1903
1904	AssertPtr(pImage);
1905
1906	if (pImage && pImage->pStorage)
1907	cb = pImage->uCurrentEndOfFile + sizeof(VHDFooter);
1908
1909	LogFlowFunc(("returns %lld\n", cb));
1910	return cb;
1911	}
1912
1913	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
1914	static int vhdGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1915	{
1916	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1917	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1918	int rc;
1919
1920	AssertPtr(pImage);
1921
1922	if (pImage)
1923	{
1924	if (pImage->PCHSGeometry.cCylinders)
1925	{
1926	*pPCHSGeometry = pImage->PCHSGeometry;
1927	rc = VINF_SUCCESS;
1928	}
1929	else
1930	rc = VERR_VD_GEOMETRY_NOT_SET;
1931	}
1932	else
1933	rc = VERR_VD_NOT_OPENED;
1934
1935	LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors));
1936	return rc;
1937	}
1938
1939	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
1940	static int vhdSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1941	{
1942	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1943	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1944	int rc;
1945
1946	AssertPtr(pImage);
1947
1948	if (pImage)
1949	{
1950	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1951	{
1952	rc = VERR_VD_IMAGE_READ_ONLY;
1953	goto out;
1954	}
1955
1956	pImage->PCHSGeometry = *pPCHSGeometry;
1957	rc = VINF_SUCCESS;
1958	}
1959	else
1960	rc = VERR_VD_NOT_OPENED;
1961
1962	out:
1963	LogFlowFunc(("returns %Rrc\n", rc));
1964	return rc;
1965	}
1966
1967	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
1968	static int vhdGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
1969	{
1970	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
1971	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1972	int rc;
1973
1974	AssertPtr(pImage);
1975
1976	if (pImage)
1977	{
1978	if (pImage->LCHSGeometry.cCylinders)
1979	{
1980	*pLCHSGeometry = pImage->LCHSGeometry;
1981	rc = VINF_SUCCESS;
1982	}
1983	else
1984	rc = VERR_VD_GEOMETRY_NOT_SET;
1985	}
1986	else
1987	rc = VERR_VD_NOT_OPENED;
1988
1989	LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors));
1990	return rc;
1991	}
1992
1993	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
1994	static int vhdSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
1995	{
1996	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
1997	int rc;
1998
1999	AssertPtr(pImage);
2000
2001	if (pImage)
2002	{
2003	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2004	{
2005	rc = VERR_VD_IMAGE_READ_ONLY;
2006	goto out;
2007	}
2008
2009	pImage->LCHSGeometry = *pLCHSGeometry;
2010	rc = VINF_SUCCESS;
2011	}
2012	else
2013	rc = VERR_VD_NOT_OPENED;
2014
2015	out:
2016	LogFlowFunc(("returns %Rrc\n", rc));
2017	return rc;
2018	}
2019
2020	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
2021	static unsigned vhdGetImageFlags(void *pBackendData)
2022	{
2023	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2024	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2025	unsigned uImageFlags;
2026
2027	AssertPtr(pImage);
2028
2029	if (pImage)
2030	uImageFlags = pImage->uImageFlags;
2031	else
2032	uImageFlags = 0;
2033
2034	LogFlowFunc(("returns %#x\n", uImageFlags));
2035	return uImageFlags;
2036	}
2037
2038	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
2039	static unsigned vhdGetOpenFlags(void *pBackendData)
2040	{
2041	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2042	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2043	unsigned uOpenFlags;
2044
2045	AssertPtr(pImage);
2046
2047	if (pImage)
2048	uOpenFlags = pImage->uOpenFlags;
2049	else
2050	uOpenFlags = 0;
2051
2052	LogFlowFunc(("returns %#x\n", uOpenFlags));
2053	return uOpenFlags;
2054	}
2055
2056	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
2057	static int vhdSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
2058	{
2059	LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
2060	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2061	int rc;
2062
2063	/* Image must be opened and the new flags must be valid. */
2064	if (!pImage \|\| (uOpenFlags & ~( VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO
2065	\| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE
2066	\| VD_OPEN_FLAGS_SEQUENTIAL \| VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)))
2067	{
2068	rc = VERR_INVALID_PARAMETER;
2069	goto out;
2070	}
2071
2072	/* Implement this operation via reopening the image. */
2073	rc = vhdFreeImage(pImage, false);
2074	if (RT_FAILURE(rc))
2075	goto out;
2076	rc = vhdOpenImage(pImage, uOpenFlags);
2077
2078	out:
2079	LogFlowFunc(("returns %Rrc\n", rc));
2080	return rc;
2081	}
2082
2083	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
2084	static int vhdGetComment(void pBackendData, char pszComment,
2085	size_t cbComment)
2086	{
2087	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
2088	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2089	int rc;
2090
2091	AssertPtr(pImage);
2092
2093	if (pImage)
2094	rc = VERR_NOT_SUPPORTED;
2095	else
2096	rc = VERR_VD_NOT_OPENED;
2097
2098	LogFlowFunc(("returns %Rrc comment='%s'\n", rc, pszComment));
2099	return rc;
2100	}
2101
2102	/** @copydoc VBOXHDDBACKEND::pfnSetComment */
2103	static int vhdSetComment(void pBackendData, const char pszComment)
2104	{
2105	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
2106	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2107	int rc;
2108
2109	AssertPtr(pImage);
2110
2111	if (pImage)
2112	{
2113	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2114	rc = VERR_VD_IMAGE_READ_ONLY;
2115	else
2116	rc = VERR_NOT_SUPPORTED;
2117	}
2118	else
2119	rc = VERR_VD_NOT_OPENED;
2120
2121	LogFlowFunc(("returns %Rrc\n", rc));
2122	return rc;
2123	}
2124
2125	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
2126	static int vhdGetUuid(void *pBackendData, PRTUUID pUuid)
2127	{
2128	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2129	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2130	int rc;
2131
2132	AssertPtr(pImage);
2133
2134	if (pImage)
2135	{
2136	*pUuid = pImage->ImageUuid;
2137	rc = VINF_SUCCESS;
2138	}
2139	else
2140	rc = VERR_VD_NOT_OPENED;
2141
2142	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2143	return rc;
2144	}
2145
2146	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
2147	static int vhdSetUuid(void *pBackendData, PCRTUUID pUuid)
2148	{
2149	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2150	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2151	int rc;
2152
2153	AssertPtr(pImage);
2154
2155	if (pImage)
2156	{
2157	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2158	{
2159	pImage->ImageUuid = *pUuid;
2160	/* Update the footer copy. It will get written to disk when the image is closed. */
2161	memcpy(&pImage->vhdFooterCopy.UniqueID, pUuid, 16);
2162	/* Update checksum. */
2163	pImage->vhdFooterCopy.Checksum = 0;
2164	pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter)));
2165
2166	/* Need to update the dynamic disk header to update the disk footer copy at the beginning. */
2167	if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
2168	pImage->fDynHdrNeedsUpdate = true;
2169	rc = VINF_SUCCESS;
2170	}
2171	else
2172	rc = VERR_VD_IMAGE_READ_ONLY;
2173	}
2174	else
2175	rc = VERR_VD_NOT_OPENED;
2176
2177	LogFlowFunc(("returns %Rrc\n", rc));
2178	return rc;
2179	}
2180
2181	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
2182	static int vhdGetModificationUuid(void *pBackendData, PRTUUID pUuid)
2183	{
2184	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2185	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2186	int rc;
2187
2188	AssertPtr(pImage);
2189
2190	if (pImage)
2191	rc = VERR_NOT_SUPPORTED;
2192	else
2193	rc = VERR_VD_NOT_OPENED;
2194
2195	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2196	return rc;
2197	}
2198
2199	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
2200	static int vhdSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
2201	{
2202	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2203	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2204	int rc;
2205
2206	AssertPtr(pImage);
2207
2208	if (pImage)
2209	{
2210	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2211	rc = VERR_NOT_SUPPORTED;
2212	else
2213	rc = VERR_VD_IMAGE_READ_ONLY;
2214	}
2215	else
2216	rc = VERR_VD_NOT_OPENED;
2217
2218	LogFlowFunc(("returns %Rrc\n", rc));
2219	return rc;
2220	}
2221
2222	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
2223	static int vhdGetParentUuid(void *pBackendData, PRTUUID pUuid)
2224	{
2225	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2226	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2227	int rc;
2228
2229	AssertPtr(pImage);
2230
2231	if (pImage)
2232	{
2233	*pUuid = pImage->ParentUuid;
2234	rc = VINF_SUCCESS;
2235	}
2236	else
2237	rc = VERR_VD_NOT_OPENED;
2238
2239	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2240	return rc;
2241	}
2242
2243	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
2244	static int vhdSetParentUuid(void *pBackendData, PCRTUUID pUuid)
2245	{
2246	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2247	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2248	int rc = VINF_SUCCESS;
2249
2250	AssertPtr(pImage);
2251
2252	if (pImage && pImage->pStorage)
2253	{
2254	if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED))
2255	{
2256	pImage->ParentUuid = *pUuid;
2257	pImage->fDynHdrNeedsUpdate = true;
2258	}
2259	else
2260	rc = VERR_VD_IMAGE_READ_ONLY;
2261	}
2262	else
2263	rc = VERR_VD_NOT_OPENED;
2264
2265	LogFlowFunc(("returns %Rrc\n", rc));
2266	return rc;
2267	}
2268
2269	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
2270	static int vhdGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
2271	{
2272	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2273	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2274	int rc;
2275
2276	AssertPtr(pImage);
2277
2278	if (pImage)
2279	rc = VERR_NOT_SUPPORTED;
2280	else
2281	rc = VERR_VD_NOT_OPENED;
2282
2283	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2284	return rc;
2285	}
2286
2287	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
2288	static int vhdSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
2289	{
2290	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2291	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2292	int rc;
2293
2294	AssertPtr(pImage);
2295
2296	if (pImage)
2297	{
2298	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2299	rc = VERR_NOT_SUPPORTED;
2300	else
2301	rc = VERR_VD_IMAGE_READ_ONLY;
2302	}
2303	else
2304	rc = VERR_VD_NOT_OPENED;
2305
2306	LogFlowFunc(("returns %Rrc\n", rc));
2307	return rc;
2308	}
2309
2310	/** @copydoc VBOXHDDBACKEND::pfnDump */
2311	static void vhdDump(void *pBackendData)
2312	{
2313	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2314
2315	AssertPtr(pImage);
2316	if (pImage)
2317	{
2318	vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%u\n",
2319	pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors,
2320	pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors,
2321	VHD_SECTOR_SIZE);
2322	vdIfErrorMessage(pImage->pIfError, "Header: uuidCreation={%RTuuid}\n", &pImage->ImageUuid);
2323	vdIfErrorMessage(pImage->pIfError, "Header: uuidParent={%RTuuid}\n", &pImage->ParentUuid);
2324	}
2325	}
2326
2327	/** @copydoc VBOXHDDBACKEND::pfnGetTimestamp */
2328	static int vhdGetTimeStamp(void *pBackendData, PRTTIMESPEC pTimeStamp)
2329	{
2330	int rc = VINF_SUCCESS;
2331	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2332
2333	AssertPtr(pImage);
2334
2335	if (pImage)
2336	rc = vdIfIoIntFileGetModificationTime(pImage->pIfIo, pImage->pszFilename, pTimeStamp);
2337	else
2338	rc = VERR_VD_NOT_OPENED;
2339
2340	LogFlowFunc(("returns %Rrc\n", rc));
2341	return rc;
2342	}
2343
2344	/** @copydoc VBOXHDDBACKEND::pfnGetParentTimeStamp */
2345	static int vhdGetParentTimeStamp(void *pBackendData, PRTTIMESPEC pTimeStamp)
2346	{
2347	int rc = VINF_SUCCESS;
2348	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2349
2350	AssertPtr(pImage);
2351
2352	if (pImage)
2353	vhdTime2RtTime(pTimeStamp, pImage->u32ParentTimeStamp);
2354	else
2355	rc = VERR_VD_NOT_OPENED;
2356
2357	LogFlowFunc(("returns %Rrc\n", rc));
2358	return rc;
2359	}
2360
2361	/** @copydoc VBOXHDDBACKEND::pfnSetParentTimeStamp */
2362	static int vhdSetParentTimeStamp(void *pBackendData, PCRTTIMESPEC pTimeStamp)
2363	{
2364	int rc = VINF_SUCCESS;
2365	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2366
2367	AssertPtr(pImage);
2368	if (pImage)
2369	{
2370	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2371	rc = VERR_VD_IMAGE_READ_ONLY;
2372	else
2373	{
2374	pImage->u32ParentTimeStamp = vhdRtTime2VhdTime(pTimeStamp);
2375	pImage->fDynHdrNeedsUpdate = true;
2376	}
2377	}
2378	else
2379	rc = VERR_VD_NOT_OPENED;
2380
2381	LogFlowFunc(("returns %Rrc\n", rc));
2382	return rc;
2383	}
2384
2385	/** @copydoc VBOXHDDBACKEND::pfnGetParentFilename */
2386	static int vhdGetParentFilename(void pBackendData, char *ppszParentFilename)
2387	{
2388	int rc = VINF_SUCCESS;
2389	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2390
2391	AssertPtr(pImage);
2392	if (pImage)
2393	*ppszParentFilename = RTStrDup(pImage->pszParentFilename);
2394	else
2395	rc = VERR_VD_NOT_OPENED;
2396
2397	LogFlowFunc(("returns %Rrc\n", rc));
2398	return rc;
2399	}
2400
2401	/** @copydoc VBOXHDDBACKEND::pfnSetParentFilename */
2402	static int vhdSetParentFilename(void pBackendData, const char pszParentFilename)
2403	{
2404	int rc = VINF_SUCCESS;
2405	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2406
2407	AssertPtr(pImage);
2408	if (pImage)
2409	{
2410	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2411	rc = VERR_VD_IMAGE_READ_ONLY;
2412	else
2413	{
2414	if (pImage->pszParentFilename)
2415	RTStrFree(pImage->pszParentFilename);
2416	pImage->pszParentFilename = RTStrDup(pszParentFilename);
2417	if (!pImage->pszParentFilename)
2418	rc = VERR_NO_MEMORY;
2419	else
2420	pImage->fDynHdrNeedsUpdate = true;
2421	}
2422	}
2423	else
2424	rc = VERR_VD_NOT_OPENED;
2425
2426	LogFlowFunc(("returns %Rrc\n", rc));
2427	return rc;
2428	}
2429
2430	/** @copydoc VBOXHDDBACKEND::pfnCompact */
2431	static int vhdCompact(void *pBackendData, unsigned uPercentStart,
2432	unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk,
2433	PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation)
2434	{
2435	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2436	int rc = VINF_SUCCESS;
2437	void pvBuf = NULL, pvReplace = NULL;
2438	uint32_t *paBlocks = NULL;
2439
2440	int (pfnParentRead)(void , uint64_t, void *, size_t) = NULL;
2441	void *pvParent = NULL;
2442	PVDINTERFACEPARENTSTATE pIfParentState = VDIfParentStateGet(pVDIfsOperation);
2443	if (pIfParentState)
2444	{
2445	pfnParentRead = pIfParentState->pfnParentRead;
2446	pvParent = pIfParentState->Core.pvUser;
2447	}
2448
2449	PFNVDPROGRESS pfnProgress = NULL;
2450	void *pvUser = NULL;
2451	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
2452	if (pIfProgress)
2453	{
2454	pfnProgress = pIfProgress->pfnProgress;
2455	pvUser = pIfProgress->Core.pvUser;
2456	}
2457
2458	do
2459	{
2460	AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER);
2461
2462	AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY),
2463	rc = VERR_VD_IMAGE_READ_ONLY);
2464
2465	/* Reject fixed images as they don't have a BAT. */
2466	if (pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2467	{
2468	rc = VERR_NOT_SUPPORTED;
2469	break;
2470	}
2471
2472	if (pfnParentRead)
2473	{
2474	pvParent = RTMemTmpAlloc(pImage->cbDataBlock);
2475	AssertBreakStmt(pvParent, rc = VERR_NO_MEMORY);
2476	}
2477	pvBuf = RTMemTmpAlloc(pImage->cbDataBlock);
2478	AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY);
2479
2480	unsigned cBlocksAllocated = 0;
2481	unsigned cBlocksToMove = 0;
2482	unsigned cBlocks = pImage->cBlockAllocationTableEntries;
2483	uint32_t offBlocksStart = ~0U; /* Start offset of data blocks in sectors. */
2484	uint32_t *paBat = pImage->pBlockAllocationTable;
2485
2486	/* Count the number of allocated blocks and find the start offset for the data blocks. */
2487	for (unsigned i = 0; i < cBlocks; i++)
2488	if (paBat[i] != ~0U)
2489	{
2490	cBlocksAllocated++;
2491	if (paBat[i] < offBlocksStart)
2492	offBlocksStart = paBat[i];
2493	}
2494
2495	if (!cBlocksAllocated)
2496	{
2497	/* Nothing to do. */
2498	rc = VINF_SUCCESS;
2499	break;
2500	}
2501
2502	paBlocks = (uint32_t )RTMemTmpAllocZ(cBlocksAllocated sizeof(uint32_t));
2503	AssertBreakStmt(paBlocks, rc = VERR_NO_MEMORY);
2504
2505	/* Invalidate the back resolving array. */
2506	for (unsigned i = 0; i < cBlocksAllocated; i++)
2507	paBlocks[i] = ~0U;
2508
2509	/* Fill the back resolving table. */
2510	for (unsigned i = 0; i < cBlocks; i++)
2511	if (paBat[i] != ~0U)
2512	{
2513	unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock;
2514	if ( idxBlock < cBlocksAllocated
2515	&& paBlocks[idxBlock] == ~0U)
2516	paBlocks[idxBlock] = i;
2517	else
2518	{
2519	/* The image is in an inconsistent state. Don't go further. */
2520	rc = VERR_INVALID_STATE;
2521	break;
2522	}
2523	}
2524
2525	if (RT_FAILURE(rc))
2526	break;
2527
2528	/* Find redundant information and update the block pointers
2529	* accordingly, creating bubbles. Keep disk up to date, as this
2530	* enables cancelling. */
2531	for (unsigned i = 0; i < cBlocks; i++)
2532	{
2533	if (paBat[i] != ~0U)
2534	{
2535	unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock;
2536
2537	/* Block present in image file, read relevant data. */
2538	uint64_t u64Offset = ((uint64_t)paBat[i] + pImage->cDataBlockBitmapSectors) * VHD_SECTOR_SIZE;
2539	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2540	u64Offset, pvBuf, pImage->cbDataBlock);
2541	if (RT_FAILURE(rc))
2542	break;
2543
2544	if (ASMBitFirstSet((volatile void )pvBuf, (uint32_t)pImage->cbDataBlock 8) == -1)
2545	{
2546	paBat[i] = ~0;
2547	paBlocks[idxBlock] = ~0U;
2548	/* Adjust progress info, one block to be relocated. */
2549	cBlocksToMove++;
2550	}
2551	else if (pfnParentRead)
2552	{
2553	rc = pfnParentRead(pvParent, (uint64_t)i * pImage->cbDataBlock, pvParent, pImage->cbDataBlock);
2554	if (RT_FAILURE(rc))
2555	break;
2556	if (!memcmp(pvParent, pvBuf, pImage->cbDataBlock))
2557	{
2558	paBat[i] = ~0U;
2559	paBlocks[idxBlock] = ~0U;
2560	/* Adjust progress info, one block to be relocated. */
2561	cBlocksToMove++;
2562	}
2563	}
2564	}
2565
2566	if (pIfProgress && pIfProgress->pfnProgress)
2567	{
2568	rc = pIfProgress->pfnProgress(pIfProgress->Core.pvUser,
2569	(uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2570	if (RT_FAILURE(rc))
2571	break;
2572	}
2573	}
2574
2575	if (RT_SUCCESS(rc))
2576	{
2577	/* Fill bubbles with other data (if available). */
2578	unsigned cBlocksMoved = 0;
2579	unsigned uBlockUsedPos = cBlocksAllocated;
2580	size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of whole block containing the bitmap and the user data. */
2581
2582	/* Allocate data buffer to hold the data block and allocation bitmap in front of the actual data. */
2583	RTMemTmpFree(pvBuf);
2584	pvBuf = RTMemTmpAllocZ(cbBlock);
2585	AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY);
2586
2587	for (unsigned i = 0; i < cBlocksAllocated; i++)
2588	{
2589	unsigned uBlock = paBlocks[i];
2590	if (uBlock == ~0U)
2591	{
2592	unsigned uBlockData = ~0U;
2593	while (uBlockUsedPos > i && uBlockData == ~0U)
2594	{
2595	uBlockUsedPos--;
2596	uBlockData = paBlocks[uBlockUsedPos];
2597	}
2598	/* Terminate early if there is no block which needs copying. */
2599	if (uBlockUsedPos == i)
2600	break;
2601	uint64_t u64Offset = (uint64_t)uBlockUsedPos * cbBlock
2602	+ (offBlocksStart * VHD_SECTOR_SIZE);
2603	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2604	u64Offset, pvBuf, cbBlock);
2605	if (RT_FAILURE(rc))
2606	break;
2607
2608	u64Offset = (uint64_t)i * cbBlock
2609	+ (offBlocksStart * VHD_SECTOR_SIZE);
2610	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2611	u64Offset, pvBuf, cbBlock);
2612	if (RT_FAILURE(rc))
2613	break;
2614
2615	paBat[uBlockData] = i*(pImage->cSectorsPerDataBlock + pImage->cDataBlockBitmapSectors) + offBlocksStart;
2616
2617	/* Truncate the file but leave enough room for the footer to avoid
2618	* races if other processes fill the whole harddisk. */
2619	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
2620	pImage->uCurrentEndOfFile - cbBlock + VHD_SECTOR_SIZE);
2621	if (RT_FAILURE(rc))
2622	break;
2623
2624	/* Update pointers and write footer. */
2625	pImage->uCurrentEndOfFile -= cbBlock;
2626
2627	/* We're kinda screwed if this failes. */
2628	rc = vhdUpdateFooter(pImage);
2629	if (RT_FAILURE(rc))
2630	break;
2631
2632	paBlocks[i] = uBlockData;
2633	paBlocks[uBlockUsedPos] = ~0U;
2634	cBlocksMoved++;
2635	}
2636
2637	if (pIfProgress && pIfProgress->pfnProgress)
2638	{
2639	rc = pIfProgress->pfnProgress(pIfProgress->Core.pvUser,
2640	(uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart);
2641
2642	if (RT_FAILURE(rc))
2643	break;
2644	}
2645	}
2646	}
2647
2648	/* Write the new BAT in any case. */
2649	rc = vhdFlushImage(pImage);
2650	} while (0);
2651
2652	if (paBlocks)
2653	RTMemTmpFree(paBlocks);
2654	if (pvParent)
2655	RTMemTmpFree(pvParent);
2656	if (pvBuf)
2657	RTMemTmpFree(pvBuf);
2658
2659	if (RT_SUCCESS(rc) && pIfProgress && pIfProgress->pfnProgress)
2660	{
2661	pIfProgress->pfnProgress(pIfProgress->Core.pvUser,
2662	uPercentStart + uPercentSpan);
2663	}
2664
2665	LogFlowFunc(("returns %Rrc\n", rc));
2666	return rc;
2667	}
2668
2669	/** @copydoc VBOXHDDBACKEND::pfnResize */
2670	static int vhdResize(void *pBackendData, uint64_t cbSize,
2671	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2672	unsigned uPercentStart, unsigned uPercentSpan,
2673	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2674	PVDINTERFACE pVDIfsOperation)
2675	{
2676	PVHDIMAGE pImage = (PVHDIMAGE)pBackendData;
2677	int rc = VINF_SUCCESS;
2678
2679	PFNVDPROGRESS pfnProgress = NULL;
2680	void *pvUser = NULL;
2681	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
2682	if (pIfProgress)
2683	{
2684	pfnProgress = pIfProgress->pfnProgress;
2685	pvUser = pIfProgress->Core.pvUser;
2686	}
2687
2688	/* Making the image smaller is not supported at the moment. */
2689	if ( cbSize < pImage->cbSize
2690	\|\| pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)
2691	rc = VERR_NOT_SUPPORTED;
2692	else if (cbSize > pImage->cbSize)
2693	{
2694	unsigned cBlocksAllocated = 0;
2695	size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of a block including the sector bitmap. */
2696	uint32_t cBlocksNew = cbSize / pImage->cbDataBlock; /** < New number of blocks in the image after the resize */
2697	if (cbSize % pImage->cbDataBlock)
2698	cBlocksNew++;
2699
2700	uint32_t cBlocksOld = pImage->cBlockAllocationTableEntries; /** < Number of blocks before the resize. */
2701	uint64_t cbBlockspaceNew = RT_ALIGN_32(cBlocksNew * sizeof(uint32_t), VHD_SECTOR_SIZE); /** < Required space for the block array after the resize. */
2702	uint64_t offStartDataNew = RT_ALIGN_32(pImage->uBlockAllocationTableOffset + cbBlockspaceNew, VHD_SECTOR_SIZE); /** < New start offset for block data after the resize */
2703	uint64_t offStartDataOld = ~0ULL;
2704
2705	/* Go through the BAT and find the data start offset. */
2706	for (unsigned idxBlock = 0; idxBlock < pImage->cBlockAllocationTableEntries; idxBlock++)
2707	{
2708	if (pImage->pBlockAllocationTable[idxBlock] != ~0U)
2709	{
2710	uint64_t offStartBlock = (uint64_t)pImage->pBlockAllocationTable[idxBlock] * VHD_SECTOR_SIZE;
2711	if (offStartBlock < offStartDataOld)
2712	offStartDataOld = offStartBlock;
2713	cBlocksAllocated++;
2714	}
2715	}
2716
2717	if ( offStartDataOld != offStartDataNew
2718	&& cBlocksAllocated > 0)
2719	{
2720	/* Calculate how many sectors nee to be relocated. */
2721	uint64_t cbOverlapping = offStartDataNew - offStartDataOld;
2722	unsigned cBlocksReloc = (unsigned)(cbOverlapping / cbBlock);
2723	if (cbOverlapping % cbBlock)
2724	cBlocksReloc++;
2725
2726	cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated);
2727	offStartDataNew = offStartDataOld;
2728
2729	/* Do the relocation. */
2730	LogFlow(("Relocating %u blocks\n", cBlocksReloc));
2731
2732	/*
2733	* Get the blocks we need to relocate first, they are appended to the end
2734	* of the image.
2735	*/
2736	void pvBuf = NULL, pvZero = NULL;
2737	do
2738	{
2739	/* Allocate data buffer. */
2740	pvBuf = RTMemAllocZ(cbBlock);
2741	if (!pvBuf)
2742	{
2743	rc = VERR_NO_MEMORY;
2744	break;
2745	}
2746
2747	/* Allocate buffer for overwriting with zeroes. */
2748	pvZero = RTMemAllocZ(cbBlock);
2749	if (!pvZero)
2750	{
2751	rc = VERR_NO_MEMORY;
2752	break;
2753	}
2754
2755	for (unsigned i = 0; i < cBlocksReloc; i++)
2756	{
2757	uint32_t uBlock = offStartDataNew / VHD_SECTOR_SIZE;
2758
2759	/* Search the index in the block table. */
2760	for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++)
2761	{
2762	if (pImage->pBlockAllocationTable[idxBlock] == uBlock)
2763	{
2764	/* Read data and append to the end of the image. */
2765	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
2766	offStartDataNew, pvBuf, cbBlock);
2767	if (RT_FAILURE(rc))
2768	break;
2769
2770	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2771	pImage->uCurrentEndOfFile, pvBuf, cbBlock);
2772	if (RT_FAILURE(rc))
2773	break;
2774
2775	/* Zero out the old block area. */
2776	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2777	offStartDataNew, pvZero, cbBlock);
2778	if (RT_FAILURE(rc))
2779	break;
2780
2781	/* Update block counter. */
2782	pImage->pBlockAllocationTable[idxBlock] = pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE;
2783
2784	pImage->uCurrentEndOfFile += cbBlock;
2785
2786	/* Continue with the next block. */
2787	break;
2788	}
2789	}
2790
2791	if (RT_FAILURE(rc))
2792	break;
2793
2794	offStartDataNew += cbBlock;
2795	}
2796	} while (0);
2797
2798	if (pvBuf)
2799	RTMemFree(pvBuf);
2800	if (pvZero)
2801	RTMemFree(pvZero);
2802	}
2803
2804	/*
2805	* Relocation done, expand the block array and update the header with
2806	* the new data.
2807	*/
2808	if (RT_SUCCESS(rc))
2809	{
2810	uint32_t paBlocksNew = (uint32_t )RTMemRealloc(pImage->pBlockAllocationTable, cBlocksNew * sizeof(uint32_t));
2811	if (paBlocksNew)
2812	{
2813	pImage->pBlockAllocationTable = paBlocksNew;
2814
2815	/* Mark the new blocks as unallocated. */
2816	for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++)
2817	pImage->pBlockAllocationTable[idxBlock] = ~0U;
2818	}
2819	else
2820	rc = VERR_NO_MEMORY;
2821
2822	if (RT_SUCCESS(rc))
2823	{
2824	/* Write the block array before updating the rest. */
2825	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2826	pImage->uBlockAllocationTableOffset,
2827	pImage->pBlockAllocationTable,
2828	cBlocksNew * sizeof(uint32_t));
2829	}
2830
2831	if (RT_SUCCESS(rc))
2832	{
2833	/* Update size and new block count. */
2834	pImage->cBlockAllocationTableEntries = cBlocksNew;
2835	pImage->cbSize = cbSize;
2836
2837	/* Update geometry. */
2838	pImage->PCHSGeometry = *pPCHSGeometry;
2839	pImage->LCHSGeometry = *pLCHSGeometry;
2840	}
2841	}
2842
2843	/* Update header information in base image file. */
2844	pImage->fDynHdrNeedsUpdate = true;
2845	vhdFlushImage(pImage);
2846	}
2847	/* Same size doesn't change the image at all. */
2848
2849	LogFlowFunc(("returns %Rrc\n", rc));
2850	return rc;
2851	}
2852
2853	/** @copydoc VBOXHDDBACKEND::pfnRepair */
2854	static DECLCALLBACK(int) vhdRepair(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
2855	PVDINTERFACE pVDIfsImage, uint32_t fFlags)
2856	{
2857	LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
2858	int rc;
2859	PVDINTERFACEERROR pIfError;
2860	PVDINTERFACEIOINT pIfIo;
2861	PVDIOSTORAGE pStorage;
2862	uint64_t cbFile;
2863	VHDFooter vhdFooter;
2864	VHDDynamicDiskHeader dynamicDiskHeader;
2865	uint32_t *paBat = NULL;
2866	uint32_t *pu32BlockBitmap = NULL;
2867
2868	pIfIo = VDIfIoIntGet(pVDIfsImage);
2869	AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
2870
2871	pIfError = VDIfErrorGet(pVDIfsDisk);
2872
2873	do
2874	{
2875	uint64_t offDynamicDiskHeader = 0;
2876	uint64_t offBat = 0;
2877	uint64_t offFooter = 0;
2878	uint32_t cBatEntries = 0;
2879	bool fDynamic = false;
2880	bool fRepairFooter = false;
2881	bool fRepairBat = false;
2882	bool fRepairDynHeader = false;
2883
2884	rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
2885	VDOpenFlagsToFileOpenFlags( fFlags & VD_REPAIR_DRY_RUN
2886	? VD_OPEN_FLAGS_READONLY
2887	: 0,
2888	false /* fCreate */),
2889	&pStorage);
2890	if (RT_FAILURE(rc))
2891	{
2892	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to open image \"%s\"", pszFilename);
2893	break;
2894	}
2895
2896	rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
2897	if (RT_FAILURE(rc))
2898	{
2899	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to query image size");
2900	break;
2901	}
2902
2903	if (cbFile < sizeof(VHDFooter))
2904	{
2905	rc = vdIfError(pIfError, VERR_VD_INVALID_SIZE, RT_SRC_POS,
2906	"Image must be at least %u bytes (got %llu)",
2907	sizeof(VHDFooter), cbFile);
2908	break;
2909	}
2910
2911	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter),
2912	&vhdFooter, sizeof(VHDFooter));
2913	if (RT_FAILURE(rc))
2914	{
2915	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read footer of image");
2916	break;
2917	}
2918
2919	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
2920	{
2921	/* Dynamic images have a backup at the beginning of the image. */
2922	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0,
2923	&vhdFooter, sizeof(VHDFooter));
2924	if (RT_FAILURE(rc))
2925	{
2926	rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read header of image");
2927	break;
2928	}
2929
2930	/*
2931	* Check for the header, if this fails the image is either completely corrupted
2932	* and impossible to repair or in another format.
2933	*/
2934	if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)
2935	{
2936	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2937	"No valid VHD structures found");
2938	break;
2939	}
2940	else
2941	vdIfErrorMessage(pIfError, "Missing footer structure, using backup\n");
2942
2943	/* Remember to fix the footer structure. */
2944	fRepairFooter = true;
2945	}
2946
2947	offFooter = cbFile - sizeof(VHDFooter);
2948
2949	/* Verify that checksums match. */
2950	uint32_t u32ChkSumOld = RT_BE2H_U32(vhdFooter.Checksum);
2951	vhdFooter.Checksum = 0;
2952	uint32_t u32ChkSum = vhdChecksum(&vhdFooter, sizeof(VHDFooter));
2953
2954	vhdFooter.Checksum = RT_H2BE_U32(u32ChkSum);
2955
2956	if (u32ChkSumOld != u32ChkSum)
2957	{
2958	vdIfErrorMessage(pIfError, "Checksum is invalid (should be %u got %u), repairing\n",
2959	u32ChkSum, u32ChkSumOld);
2960	fRepairFooter = true;
2961	break;
2962	}
2963
2964	switch (RT_BE2H_U32(vhdFooter.DiskType))
2965	{
2966	case VHD_FOOTER_DISK_TYPE_FIXED:
2967	fDynamic = false;
2968	break;
2969	case VHD_FOOTER_DISK_TYPE_DYNAMIC:
2970	fDynamic = true;
2971	break;
2972	case VHD_FOOTER_DISK_TYPE_DIFFERENCING:
2973	fDynamic = true;
2974	break;
2975	default:
2976	{
2977	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2978	"VHD image type %u is not supported",
2979	RT_BE2H_U32(vhdFooter.DiskType));
2980	break;
2981	}
2982	}
2983
2984	/* Load and check dynamic disk header if required. */
2985	if (fDynamic)
2986	{
2987	size_t cbBlock;
2988
2989	offDynamicDiskHeader = RT_BE2H_U64(vhdFooter.DataOffset);
2990	if (offDynamicDiskHeader + sizeof(VHDDynamicDiskHeader) > cbFile)
2991	{
2992	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
2993	"VHD image type is not supported");
2994	break;
2995	}
2996
2997	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offDynamicDiskHeader,
2998	&dynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
2999	if (RT_FAILURE(rc))
3000	{
3001	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3002	"Failed to read dynamic disk header (at %llu), %Rrc",
3003	offDynamicDiskHeader, rc);
3004	break;
3005	}
3006
3007	/* Verify that checksums match. */
3008	u32ChkSumOld = RT_BE2H_U32(dynamicDiskHeader.Checksum);
3009	dynamicDiskHeader.Checksum = 0;
3010	u32ChkSum = vhdChecksum(&dynamicDiskHeader, sizeof(VHDDynamicDiskHeader));
3011
3012	dynamicDiskHeader.Checksum = RT_H2BE_U32(u32ChkSum);
3013
3014	if (u32ChkSumOld != u32ChkSum)
3015	{
3016	vdIfErrorMessage(pIfError, "Checksum of dynamic disk header is invalid (should be %u got %u), repairing\n",
3017	u32ChkSum, u32ChkSumOld);
3018	fRepairDynHeader = true;
3019	break;
3020	}
3021
3022	/* Read the block allocation table and fix any inconsistencies. */
3023	offBat = RT_BE2H_U64(dynamicDiskHeader.TableOffset);
3024	cBatEntries = RT_BE2H_U32(dynamicDiskHeader.MaxTableEntries);
3025	cbBlock = RT_BE2H_U32(dynamicDiskHeader.BlockSize);
3026	cbBlock += cbBlock / VHD_SECTOR_SIZE / 8;
3027
3028	if (offBat + cBatEntries * sizeof(uint32_t) > cbFile)
3029	{
3030	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3031	"Block allocation table is not inside the image");
3032	break;
3033	}
3034
3035	paBat = (uint32_t )RTMemAllocZ(cBatEntries sizeof(uint32_t));
3036	if (!paBat)
3037	{
3038	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3039	"Could not allocate memory for the block allocation table (%u bytes)",
3040	cBatEntries * sizeof(uint32_t));
3041	break;
3042	}
3043
3044	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offBat, paBat,
3045	cBatEntries * sizeof(uint32_t));
3046	if (RT_FAILURE(rc))
3047	{
3048	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3049	"Could not read block allocation table (at %llu), %Rrc",
3050	offBat, rc);
3051	break;
3052	}
3053
3054	pu32BlockBitmap = (uint32_t *)RTMemAllocZ(RT_ALIGN_Z(cBatEntries / 8, 4));
3055	if (!pu32BlockBitmap)
3056	{
3057	rc = vdIfError(pIfError, VERR_NO_MEMORY, RT_SRC_POS,
3058	"Failed to allocate memory for block bitmap");
3059	break;
3060	}
3061
3062	uint32_t idxMinBlock = UINT32_C(0xffffffff);
3063	for (uint32_t i = 0; i < cBatEntries; i++)
3064	{
3065	paBat[i] = RT_BE2H_U32(paBat[i]);
3066	if (paBat[i] < idxMinBlock)
3067	idxMinBlock = paBat[i];
3068	}
3069
3070	vdIfErrorMessage(pIfError, "First data block at sector %u\n", idxMinBlock);
3071
3072	for (uint32_t i = 0; i < cBatEntries; i++)
3073	{
3074	if (paBat[i] != UINT32_C(0xffffffff))
3075	{
3076	uint64_t offBlock =(uint64_t)paBat[i] * VHD_SECTOR_SIZE;
3077
3078	/*
3079	* Check that the offsets are valid (inside of the image) and
3080	* that there are no double references.
3081	*/
3082	if (offBlock + cbBlock > cbFile)
3083	{
3084	vdIfErrorMessage(pIfError, "Entry %u points to invalid offset %llu, clearing\n",
3085	i, offBlock);
3086	paBat[i] = UINT32_C(0xffffffff);
3087	fRepairBat = true;
3088	}
3089	else if (offBlock + cbBlock > offFooter)
3090	{
3091	vdIfErrorMessage(pIfError, "Entry %u intersects with footer, aligning footer\n",
3092	i);
3093	offFooter = offBlock + cbBlock;
3094	fRepairBat = true;
3095	}
3096
3097	if ( paBat[i] != UINT32_C(0xffffffff)
3098	&& ASMBitTestAndSet(pu32BlockBitmap, (uint32_t)((paBat[i] - idxMinBlock) / (cbBlock / VHD_SECTOR_SIZE))))
3099	{
3100	vdIfErrorMessage(pIfError, "Entry %u points to an already referenced data block, clearing\n",
3101	i);
3102	paBat[i] = UINT32_C(0xffffffff);
3103	fRepairBat = true;
3104	}
3105	}
3106	}
3107	}
3108
3109	/* Write repaired structures now. */
3110	if (!(fRepairBat \|\| fRepairDynHeader \|\| fRepairFooter))
3111	vdIfErrorMessage(pIfError, "VHD image is in a consistent state, no repair required\n");
3112	else if (!(fFlags & VD_REPAIR_DRY_RUN))
3113	{
3114	if (fRepairBat)
3115	{
3116	for (uint32_t i = 0; i < cBatEntries; i++)
3117	paBat[i] = RT_H2BE_U32(paBat[i]);
3118
3119	vdIfErrorMessage(pIfError, "Writing repaired block allocation table...\n");
3120
3121	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offBat, paBat,
3122	cBatEntries * sizeof(uint32_t));
3123	if (RT_FAILURE(rc))
3124	{
3125	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3126	"Could not write repaired block allocation table (at %llu), %Rrc",
3127	offBat, rc);
3128	break;
3129	}
3130	}
3131
3132	if (fRepairDynHeader)
3133	{
3134	Assert(fDynamic);
3135
3136	vdIfErrorMessage(pIfError, "Writing repaired dynamic disk header...\n");
3137	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offDynamicDiskHeader, &dynamicDiskHeader,
3138	sizeof(VHDDynamicDiskHeader));
3139	if (RT_FAILURE(rc))
3140	{
3141	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3142	"Could not write repaired dynamic disk header (at %llu), %Rrc",
3143	offDynamicDiskHeader, rc);
3144	break;
3145	}
3146	}
3147
3148	if (fRepairFooter)
3149	{
3150	vdIfErrorMessage(pIfError, "Writing repaired Footer...\n");
3151
3152	if (fDynamic)
3153	{
3154	/* Write backup at image beginning. */
3155	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, 0, &vhdFooter,
3156	sizeof(VHDFooter));
3157	if (RT_FAILURE(rc))
3158	{
3159	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3160	"Could not write repaired backup footer (at %llu), %Rrc",
3161	0, rc);
3162	break;
3163	}
3164	}
3165
3166	rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offFooter, &vhdFooter,
3167	sizeof(VHDFooter));
3168	if (RT_FAILURE(rc))
3169	{
3170	rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS,
3171	"Could not write repaired footer (at %llu), %Rrc",
3172	cbFile - sizeof(VHDFooter), rc);
3173	break;
3174	}
3175	}
3176
3177	vdIfErrorMessage(pIfError, "Corrupted VHD image repaired successfully\n");
3178	}
3179	} while(0);
3180
3181	if (paBat)
3182	RTMemFree(paBat);
3183
3184	if (pu32BlockBitmap)
3185	RTMemFree(pu32BlockBitmap);
3186
3187	if (pStorage)
3188	{
3189	int rc2 = vdIfIoIntFileClose(pIfIo, pStorage);
3190	if (RT_SUCCESS(rc))
3191	rc = rc2; /* Propagate status code only when repairing the image was successful. */
3192	}
3193
3194	LogFlowFunc(("returns %Rrc\n", rc));
3195	return rc;
3196	}
3197
3198
3199	const VBOXHDDBACKEND g_VhdBackend =
3200	{
3201	/* pszBackendName */
3202	"VHD",
3203	/* cbSize */
3204	sizeof(VBOXHDDBACKEND),
3205	/* uBackendCaps */
3206	VD_CAP_UUID \| VD_CAP_DIFF \| VD_CAP_FILE \|
3207	VD_CAP_CREATE_FIXED \| VD_CAP_CREATE_DYNAMIC \|
3208	VD_CAP_ASYNC \| VD_CAP_VFS,
3209	/* paFileExtensions */
3210	s_aVhdFileExtensions,
3211	/* paConfigInfo */
3212	NULL,
3213	/* pfnCheckIfValid */
3214	vhdCheckIfValid,
3215	/* pfnOpen */
3216	vhdOpen,
3217	/* pfnCreate */
3218	vhdCreate,
3219	/* pfnRename */
3220	vhdRename,
3221	/* pfnClose */
3222	vhdClose,
3223	/* pfnRead */
3224	vhdRead,
3225	/* pfnWrite */
3226	vhdWrite,
3227	/* pfnFlush */
3228	vhdFlush,
3229	/* pfnDiscard */
3230	NULL,
3231	/* pfnGetVersion */
3232	vhdGetVersion,
3233	/* pfnGetSectorSize */
3234	vhdGetSectorSize,
3235	/* pfnGetSize */
3236	vhdGetSize,
3237	/* pfnGetFileSize */
3238	vhdGetFileSize,
3239	/* pfnGetPCHSGeometry */
3240	vhdGetPCHSGeometry,
3241	/* pfnSetPCHSGeometry */
3242	vhdSetPCHSGeometry,
3243	/* pfnGetLCHSGeometry */
3244	vhdGetLCHSGeometry,
3245	/* pfnSetLCHSGeometry */
3246	vhdSetLCHSGeometry,
3247	/* pfnGetImageFlags */
3248	vhdGetImageFlags,
3249	/* pfnGetOpenFlags */
3250	vhdGetOpenFlags,
3251	/* pfnSetOpenFlags */
3252	vhdSetOpenFlags,
3253	/* pfnGetComment */
3254	vhdGetComment,
3255	/* pfnSetComment */
3256	vhdSetComment,
3257	/* pfnGetUuid */
3258	vhdGetUuid,
3259	/* pfnSetUuid */
3260	vhdSetUuid,
3261	/* pfnGetModificationUuid */
3262	vhdGetModificationUuid,
3263	/* pfnSetModificationUuid */
3264	vhdSetModificationUuid,
3265	/* pfnGetParentUuid */
3266	vhdGetParentUuid,
3267	/* pfnSetParentUuid */
3268	vhdSetParentUuid,
3269	/* pfnGetParentModificationUuid */
3270	vhdGetParentModificationUuid,
3271	/* pfnSetParentModificationUuid */
3272	vhdSetParentModificationUuid,
3273	/* pfnDump */
3274	vhdDump,
3275	/* pfnGetTimeStamp */
3276	vhdGetTimeStamp,
3277	/* pfnGetParentTimeStamp */
3278	vhdGetParentTimeStamp,
3279	/* pfnSetParentTimeStamp */
3280	vhdSetParentTimeStamp,
3281	/* pfnGetParentFilename */
3282	vhdGetParentFilename,
3283	/* pfnSetParentFilename */
3284	vhdSetParentFilename,
3285	/* pfnComposeLocation */
3286	genericFileComposeLocation,
3287	/* pfnComposeName */
3288	genericFileComposeName,
3289	/* pfnCompact */
3290	vhdCompact,
3291	/* pfnResize */
3292	vhdResize,
3293	/* pfnRepair */
3294	vhdRepair,
3295	/* pfnTraverseMetadata */
3296	NULL
3297	};

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source: vbox/trunk/src/VBox/Storage/VHD.cpp@ 54430

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