/* $Id: VHD.cpp 54117 2015-02-09 17:08:28Z vboxsync $ */ /** @file * VHD Disk image, Core Code. */ /* * Copyright (C) 2006-2013 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ /******************************************************************************* * Header Files * *******************************************************************************/ #define LOG_GROUP LOG_GROUP_VD_VHD #include #include #include #include #include #include #include #include #include #include #include "VDBackends.h" #define VHD_RELATIVE_MAX_PATH 512 #define VHD_ABSOLUTE_MAX_PATH 512 #define VHD_SECTOR_SIZE 512 #define VHD_BLOCK_SIZE (2 * _1M) /* This is common to all VHD disk types and is located at the end of the image */ #pragma pack(1) typedef struct VHDFooter { char Cookie[8]; uint32_t Features; uint32_t Version; uint64_t DataOffset; uint32_t TimeStamp; uint8_t CreatorApp[4]; uint32_t CreatorVer; uint32_t CreatorOS; uint64_t OrigSize; uint64_t CurSize; uint16_t DiskGeometryCylinder; uint8_t DiskGeometryHeads; uint8_t DiskGeometrySectors; uint32_t DiskType; uint32_t Checksum; char UniqueID[16]; uint8_t SavedState; uint8_t Reserved[427]; } VHDFooter; #pragma pack() /* this really is spelled with only one n */ #define VHD_FOOTER_COOKIE "conectix" #define VHD_FOOTER_COOKIE_SIZE 8 #define VHD_FOOTER_FEATURES_NOT_ENABLED 0 #define VHD_FOOTER_FEATURES_TEMPORARY 1 #define VHD_FOOTER_FEATURES_RESERVED 2 #define VHD_FOOTER_FILE_FORMAT_VERSION 0x00010000 #define VHD_FOOTER_DATA_OFFSET_FIXED UINT64_C(0xffffffffffffffff) #define VHD_FOOTER_DISK_TYPE_FIXED 2 #define VHD_FOOTER_DISK_TYPE_DYNAMIC 3 #define VHD_FOOTER_DISK_TYPE_DIFFERENCING 4 #define VHD_MAX_LOCATOR_ENTRIES 8 #define VHD_PLATFORM_CODE_NONE 0 #define VHD_PLATFORM_CODE_WI2R 0x57693272 #define VHD_PLATFORM_CODE_WI2K 0x5769326B #define VHD_PLATFORM_CODE_W2RU 0x57327275 #define VHD_PLATFORM_CODE_W2KU 0x57326B75 #define VHD_PLATFORM_CODE_MAC 0x4D163220 #define VHD_PLATFORM_CODE_MACX 0x4D163258 /* Header for expanding disk images. */ #pragma pack(1) typedef struct VHDParentLocatorEntry { uint32_t u32Code; uint32_t u32DataSpace; uint32_t u32DataLength; uint32_t u32Reserved; uint64_t u64DataOffset; } VHDPLE, *PVHDPLE; typedef struct VHDDynamicDiskHeader { char Cookie[8]; uint64_t DataOffset; uint64_t TableOffset; uint32_t HeaderVersion; uint32_t MaxTableEntries; uint32_t BlockSize; uint32_t Checksum; uint8_t ParentUuid[16]; uint32_t ParentTimeStamp; uint32_t Reserved0; uint16_t ParentUnicodeName[256]; VHDPLE ParentLocatorEntry[VHD_MAX_LOCATOR_ENTRIES]; uint8_t Reserved1[256]; } VHDDynamicDiskHeader; #pragma pack() #define VHD_DYNAMIC_DISK_HEADER_COOKIE "cxsparse" #define VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE 8 #define VHD_DYNAMIC_DISK_HEADER_VERSION 0x00010000 /** * Complete VHD image data structure. */ typedef struct VHDIMAGE { /** Image file name. */ const char *pszFilename; /** Opaque storage handle. */ PVDIOSTORAGE pStorage; /** Pointer to the per-disk VD interface list. */ PVDINTERFACE pVDIfsDisk; /** Pointer to the per-image VD interface list. */ PVDINTERFACE pVDIfsImage; /** Error interface. */ PVDINTERFACEERROR pIfError; /** I/O interface. */ PVDINTERFACEIOINT pIfIo; /** Open flags passed by VBoxHDD layer. */ unsigned uOpenFlags; /** Image flags defined during creation or determined during open. */ unsigned uImageFlags; /** Total size of the image. */ uint64_t cbSize; /** Physical geometry of this image. */ VDGEOMETRY PCHSGeometry; /** Logical geometry of this image. */ VDGEOMETRY LCHSGeometry; /** Image UUID. */ RTUUID ImageUuid; /** Parent image UUID. */ RTUUID ParentUuid; /** Parent's time stamp at the time of image creation. */ uint32_t u32ParentTimeStamp; /** Relative path to the parent image. */ char *pszParentFilename; /** The Block Allocation Table. */ uint32_t *pBlockAllocationTable; /** Number of entries in the table. */ uint32_t cBlockAllocationTableEntries; /** Size of one data block. */ uint32_t cbDataBlock; /** Sectors per data block. */ uint32_t cSectorsPerDataBlock; /** Length of the sector bitmap in bytes. */ uint32_t cbDataBlockBitmap; /** A copy of the disk footer. */ VHDFooter vhdFooterCopy; /** Current end offset of the file (without the disk footer). */ uint64_t uCurrentEndOfFile; /** Size of the data block bitmap in sectors. */ uint32_t cDataBlockBitmapSectors; /** Start of the block allocation table. */ uint64_t uBlockAllocationTableOffset; /** Buffer to hold block's bitmap for bit search operations. */ uint8_t *pu8Bitmap; /** Offset to the next data structure (dynamic disk header). */ uint64_t u64DataOffset; /** Flag to force dynamic disk header update. */ bool fDynHdrNeedsUpdate; } VHDIMAGE, *PVHDIMAGE; /** * Structure tracking the expansion process of the image * for async access. */ typedef struct VHDIMAGEEXPAND { /** Flag indicating the status of each step. */ volatile uint32_t fFlags; /** The index in the block allocation table which is written. */ uint32_t idxBatAllocated; /** Big endian representation of the block index * which is written in the BAT. */ uint32_t idxBlockBe; /** Old end of the file - used for rollback in case of an error. */ uint64_t cbEofOld; /** Sector bitmap written to the new block - variable in size. */ uint8_t au8Bitmap[1]; } VHDIMAGEEXPAND, *PVHDIMAGEEXPAND; /** * Flag defines */ #define VHDIMAGEEXPAND_STEP_IN_PROGRESS (0x0) #define VHDIMAGEEXPAND_STEP_FAILED (0x2) #define VHDIMAGEEXPAND_STEP_SUCCESS (0x3) /** All steps completed successfully. */ #define VHDIMAGEEXPAND_ALL_SUCCESS (0xff) /** All steps completed (no success indicator) */ #define VHDIMAGEEXPAND_ALL_COMPLETE (0xaa) /** Every status field has 2 bits so we can encode 4 steps in one byte. */ #define VHDIMAGEEXPAND_STATUS_MASK 0x03 #define VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT 0x00 #define VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT 0x02 #define VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT 0x04 #define VHDIMAGEEXPAND_BAT_STATUS_SHIFT 0x06 /** * Helper macros to get and set the status field. */ #define VHDIMAGEEXPAND_STATUS_GET(fFlags, cShift) \ (((fFlags) >> (cShift)) & VHDIMAGEEXPAND_STATUS_MASK) #define VHDIMAGEEXPAND_STATUS_SET(fFlags, cShift, uVal) \ ASMAtomicOrU32(&(fFlags), ((uVal) & VHDIMAGEEXPAND_STATUS_MASK) << (cShift)) /******************************************************************************* * Static Variables * *******************************************************************************/ /** NULL-terminated array of supported file extensions. */ static const VDFILEEXTENSION s_aVhdFileExtensions[] = { {"vhd", VDTYPE_HDD}, {NULL, VDTYPE_INVALID} }; /******************************************************************************* * Internal Functions * *******************************************************************************/ /** * Internal: Compute and update header checksum. */ static uint32_t vhdChecksum(void *pHeader, uint32_t cbSize) { uint32_t checksum = 0; for (uint32_t i = 0; i < cbSize; i++) checksum += ((unsigned char *)pHeader)[i]; return ~checksum; } /** * Internal: Convert filename to UTF16 with appropriate endianness. */ static int vhdFilenameToUtf16(const char *pszFilename, uint16_t *pu16Buf, uint32_t cbBufSize, uint32_t *pcbActualSize, bool fBigEndian) { int rc; PRTUTF16 tmp16 = NULL; size_t cTmp16Len; rc = RTStrToUtf16(pszFilename, &tmp16); if (RT_FAILURE(rc)) goto out; cTmp16Len = RTUtf16Len(tmp16); if (cTmp16Len * sizeof(*tmp16) > cbBufSize) { rc = VERR_FILENAME_TOO_LONG; goto out; } if (fBigEndian) for (unsigned i = 0; i < cTmp16Len; i++) pu16Buf[i] = RT_H2BE_U16(tmp16[i]); else memcpy(pu16Buf, tmp16, cTmp16Len * sizeof(*tmp16)); if (pcbActualSize) *pcbActualSize = (uint32_t)(cTmp16Len * sizeof(*tmp16)); out: if (tmp16) RTUtf16Free(tmp16); return rc; } /** * Internal: Update one locator entry. */ static int vhdLocatorUpdate(PVHDIMAGE pImage, PVHDPLE pLocator, const char *pszFilename) { int rc = VINF_SUCCESS; uint32_t cb, cbMaxLen = RT_BE2H_U32(pLocator->u32DataSpace); void *pvBuf = RTMemTmpAllocZ(cbMaxLen); char *pszTmp; if (!pvBuf) return VERR_NO_MEMORY; switch (RT_BE2H_U32(pLocator->u32Code)) { case VHD_PLATFORM_CODE_WI2R: { if (RTPathStartsWithRoot(pszFilename)) { /* Convert to relative path. */ char szPath[RTPATH_MAX]; rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename, pszFilename); if (RT_SUCCESS(rc)) { /* Update plain relative name. */ cb = (uint32_t)strlen(szPath); if (cb > cbMaxLen) { rc = VERR_FILENAME_TOO_LONG; break; } memcpy(pvBuf, szPath, cb); } } else { /* Update plain relative name. */ cb = (uint32_t)strlen(pszFilename); if (cb > cbMaxLen) { rc = VERR_FILENAME_TOO_LONG; break; } memcpy(pvBuf, pszFilename, cb); } if (RT_SUCCESS(rc)) pLocator->u32DataLength = RT_H2BE_U32(cb); break; } case VHD_PLATFORM_CODE_WI2K: /* Update plain absolute name. */ rc = RTPathAbs(pszFilename, (char *)pvBuf, cbMaxLen); if (RT_SUCCESS(rc)) pLocator->u32DataLength = RT_H2BE_U32((uint32_t)strlen((const char *)pvBuf)); break; case VHD_PLATFORM_CODE_W2RU: if (RTPathStartsWithRoot(pszFilename)) { /* Convert to relative path. */ char szPath[RTPATH_MAX]; rc = RTPathCalcRelative(szPath, sizeof(szPath), pImage->pszFilename, pszFilename); if (RT_SUCCESS(rc)) rc = vhdFilenameToUtf16(szPath, (uint16_t *)pvBuf, cbMaxLen, &cb, false); } else { /* Update unicode relative name. */ rc = vhdFilenameToUtf16(pszFilename, (uint16_t *)pvBuf, cbMaxLen, &cb, false); } if (RT_SUCCESS(rc)) pLocator->u32DataLength = RT_H2BE_U32(cb); break; case VHD_PLATFORM_CODE_W2KU: /* Update unicode absolute name. */ pszTmp = (char*)RTMemTmpAllocZ(cbMaxLen); if (!pszTmp) { rc = VERR_NO_MEMORY; break; } rc = RTPathAbs(pszFilename, pszTmp, cbMaxLen); if (RT_FAILURE(rc)) { RTMemTmpFree(pszTmp); break; } rc = vhdFilenameToUtf16(pszTmp, (uint16_t *)pvBuf, cbMaxLen, &cb, false); RTMemTmpFree(pszTmp); if (RT_SUCCESS(rc)) pLocator->u32DataLength = RT_H2BE_U32(cb); break; default: rc = VERR_NOT_IMPLEMENTED; break; } if (RT_SUCCESS(rc)) rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, RT_BE2H_U64(pLocator->u64DataOffset), pvBuf, cb); if (pvBuf) RTMemTmpFree(pvBuf); return rc; } /** * Internal: Update dynamic disk header from VHDIMAGE. */ static int vhdDynamicHeaderUpdate(PVHDIMAGE pImage) { VHDDynamicDiskHeader ddh; int rc, i; if (!pImage) return VERR_VD_NOT_OPENED; rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, pImage->u64DataOffset, &ddh, sizeof(ddh)); if (RT_FAILURE(rc)) return rc; if (memcmp(ddh.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE) != 0) return VERR_VD_VHD_INVALID_HEADER; uint32_t u32Checksum = RT_BE2H_U32(ddh.Checksum); ddh.Checksum = 0; if (u32Checksum != vhdChecksum(&ddh, sizeof(ddh))) return VERR_VD_VHD_INVALID_HEADER; /* Update parent's timestamp. */ ddh.ParentTimeStamp = RT_H2BE_U32(pImage->u32ParentTimeStamp); /* Update parent's filename. */ if (pImage->pszParentFilename) { rc = vhdFilenameToUtf16(RTPathFilename(pImage->pszParentFilename), ddh.ParentUnicodeName, sizeof(ddh.ParentUnicodeName) - 1, NULL, true); if (RT_FAILURE(rc)) return rc; } /* Update parent's locators. */ for (i = 0; i < VHD_MAX_LOCATOR_ENTRIES; i++) { /* Skip empty locators */ if ( ddh.ParentLocatorEntry[i].u32Code != RT_H2BE_U32(VHD_PLATFORM_CODE_NONE) && pImage->pszParentFilename) { rc = vhdLocatorUpdate(pImage, &ddh.ParentLocatorEntry[i], pImage->pszParentFilename); if (RT_FAILURE(rc)) return rc; } } /* Update parent's UUID */ memcpy(ddh.ParentUuid, pImage->ParentUuid.au8, sizeof(ddh.ParentUuid)); /* Update data offset and number of table entries. */ ddh.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries); ddh.Checksum = 0; ddh.Checksum = RT_H2BE_U32(vhdChecksum(&ddh, sizeof(ddh))); rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->u64DataOffset, &ddh, sizeof(ddh)); return rc; } /** * Internal: Update the VHD footer. */ static int vhdUpdateFooter(PVHDIMAGE pImage) { int rc = VINF_SUCCESS; /* Update fields which can change. */ pImage->vhdFooterCopy.CurSize = RT_H2BE_U64(pImage->cbSize); pImage->vhdFooterCopy.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders); pImage->vhdFooterCopy.DiskGeometryHeads = pImage->PCHSGeometry.cHeads; pImage->vhdFooterCopy.DiskGeometrySectors = pImage->PCHSGeometry.cSectors; pImage->vhdFooterCopy.Checksum = 0; pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter))); if (pImage->pBlockAllocationTable) rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &pImage->vhdFooterCopy, sizeof(VHDFooter)); if (RT_SUCCESS(rc)) rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, &pImage->vhdFooterCopy, sizeof(VHDFooter)); return rc; } /** * Internal. Flush image data to disk. */ static int vhdFlushImage(PVHDIMAGE pImage) { int rc = VINF_SUCCESS; if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) return VINF_SUCCESS; if (pImage->pBlockAllocationTable) { /* * This is an expanding image. Write the BAT and copy of the disk footer. */ size_t cbBlockAllocationTableToWrite = pImage->cBlockAllocationTableEntries * sizeof(uint32_t); uint32_t *pBlockAllocationTableToWrite = (uint32_t *)RTMemAllocZ(cbBlockAllocationTableToWrite); if (!pBlockAllocationTableToWrite) return VERR_NO_MEMORY; /* * The BAT entries have to be stored in big endian format. */ for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++) pBlockAllocationTableToWrite[i] = RT_H2BE_U32(pImage->pBlockAllocationTable[i]); /* * Write the block allocation table after the copy of the disk footer and the dynamic disk header. */ vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset, pBlockAllocationTableToWrite, cbBlockAllocationTableToWrite); if (pImage->fDynHdrNeedsUpdate) rc = vhdDynamicHeaderUpdate(pImage); RTMemFree(pBlockAllocationTableToWrite); } if (RT_SUCCESS(rc)) rc = vhdUpdateFooter(pImage); if (RT_SUCCESS(rc)) rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage); return rc; } /** * Internal. Free all allocated space for representing an image except pImage, * and optionally delete the image from disk. */ static int vhdFreeImage(PVHDIMAGE pImage, bool fDelete) { int rc = VINF_SUCCESS; /* Freeing a never allocated image (e.g. because the open failed) is * not signalled as an error. After all nothing bad happens. */ if (pImage) { if (pImage->pStorage) { /* No point updating the file that is deleted anyway. */ if (!fDelete) vhdFlushImage(pImage); rc = vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage); pImage->pStorage = NULL; } if (pImage->pszParentFilename) { RTStrFree(pImage->pszParentFilename); pImage->pszParentFilename = NULL; } if (pImage->pBlockAllocationTable) { RTMemFree(pImage->pBlockAllocationTable); pImage->pBlockAllocationTable = NULL; } if (pImage->pu8Bitmap) { RTMemFree(pImage->pu8Bitmap); pImage->pu8Bitmap = NULL; } if (fDelete && pImage->pszFilename) vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename); } LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /* 946684800 is the number of seconds between 1/1/1970 and 1/1/2000 */ #define VHD_TO_UNIX_EPOCH_SECONDS UINT64_C(946684800) static uint32_t vhdRtTime2VhdTime(PCRTTIMESPEC pRtTimeStamp) { uint64_t u64Seconds = RTTimeSpecGetSeconds(pRtTimeStamp); return (uint32_t)(u64Seconds - VHD_TO_UNIX_EPOCH_SECONDS); } static void vhdTime2RtTime(PRTTIMESPEC pRtTimeStamp, uint32_t u32VhdTimeStamp) { RTTimeSpecSetSeconds(pRtTimeStamp, VHD_TO_UNIX_EPOCH_SECONDS + u32VhdTimeStamp); } /** * Internal: Allocates the block bitmap rounding up to the next 32bit or 64bit boundary. * Can be freed with RTMemFree. The memory is zeroed. */ DECLINLINE(uint8_t *)vhdBlockBitmapAllocate(PVHDIMAGE pImage) { #ifdef RT_ARCH_AMD64 return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 8); #else return (uint8_t *)RTMemAllocZ(pImage->cbDataBlockBitmap + 4); #endif } /** * Internal: called when the async expansion process completed (failure or success). * Will do the necessary rollback if an error occurred. */ static int vhdAsyncExpansionComplete(PVHDIMAGE pImage, PVDIOCTX pIoCtx, PVHDIMAGEEXPAND pExpand) { int rc = VINF_SUCCESS; uint32_t fFlags = ASMAtomicReadU32(&pExpand->fFlags); bool fIoInProgress = false; /* Quick path, check if everything succeeded. */ if (fFlags == VHDIMAGEEXPAND_ALL_SUCCESS) { pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = RT_BE2H_U32(pExpand->idxBlockBe); RTMemFree(pExpand); } else { uint32_t uStatus; uStatus = VHDIMAGEEXPAND_STATUS_GET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT); if ( uStatus == VHDIMAGEEXPAND_STEP_FAILED || uStatus == VHDIMAGEEXPAND_STEP_SUCCESS) { /* Undo and restore the old value. */ pImage->pBlockAllocationTable[pExpand->idxBatAllocated] = ~0U; /* Restore the old value on the disk. * No need for a completion callback because we can't * do anything if this fails. */ if (uStatus == VHDIMAGEEXPAND_STEP_SUCCESS) { rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset + pExpand->idxBatAllocated * sizeof(uint32_t), &pImage->pBlockAllocationTable[pExpand->idxBatAllocated], sizeof(uint32_t), pIoCtx, NULL, NULL); fIoInProgress |= rc == VERR_VD_ASYNC_IO_IN_PROGRESS; } } /* Restore old size (including the footer because another application might * fill up the free space making it impossible to add the footer) * and add the footer at the right place again. */ rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pExpand->cbEofOld + sizeof(VHDFooter)); AssertRC(rc); pImage->uCurrentEndOfFile = pExpand->cbEofOld; rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, &pImage->vhdFooterCopy, sizeof(VHDFooter), pIoCtx, NULL, NULL); fIoInProgress |= rc == VERR_VD_ASYNC_IO_IN_PROGRESS; } return fIoInProgress ? VERR_VD_ASYNC_IO_IN_PROGRESS : rc; } static int vhdAsyncExpansionStepCompleted(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq, unsigned iStep) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)pvUser; LogFlowFunc(("pBackendData=%#p pIoCtx=%#p pvUser=%#p rcReq=%Rrc iStep=%u\n", pBackendData, pIoCtx, pvUser, rcReq, iStep)); if (RT_SUCCESS(rcReq)) VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_SUCCESS); else VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, iStep, VHDIMAGEEXPAND_STEP_FAILED); if ((pExpand->fFlags & VHDIMAGEEXPAND_ALL_COMPLETE) == VHDIMAGEEXPAND_ALL_COMPLETE) return vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand); return VERR_VD_ASYNC_IO_IN_PROGRESS; } static int vhdAsyncExpansionDataBlockBitmapComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq) { return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT); } static int vhdAsyncExpansionDataComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq) { return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT); } static int vhdAsyncExpansionBatUpdateComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq) { return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_BAT_STATUS_SHIFT); } static int vhdAsyncExpansionFooterUpdateComplete(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq) { return vhdAsyncExpansionStepCompleted(pBackendData, pIoCtx, pvUser, rcReq, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT); } static int vhdLoadDynamicDisk(PVHDIMAGE pImage, uint64_t uDynamicDiskHeaderOffset) { VHDDynamicDiskHeader vhdDynamicDiskHeader; int rc = VINF_SUCCESS; uint32_t *pBlockAllocationTable; uint64_t uBlockAllocationTableOffset; unsigned i = 0; Log(("Open a dynamic disk.\n")); /* * Read the dynamic disk header. */ rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, uDynamicDiskHeaderOffset, &vhdDynamicDiskHeader, sizeof(VHDDynamicDiskHeader)); if (memcmp(vhdDynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, VHD_DYNAMIC_DISK_HEADER_COOKIE_SIZE)) return VERR_INVALID_PARAMETER; pImage->cbDataBlock = RT_BE2H_U32(vhdDynamicDiskHeader.BlockSize); LogFlowFunc(("BlockSize=%u\n", pImage->cbDataBlock)); pImage->cBlockAllocationTableEntries = RT_BE2H_U32(vhdDynamicDiskHeader.MaxTableEntries); LogFlowFunc(("MaxTableEntries=%lu\n", pImage->cBlockAllocationTableEntries)); AssertMsg(!(pImage->cbDataBlock % VHD_SECTOR_SIZE), ("%s: Data block size is not a multiple of %!\n", __FUNCTION__, VHD_SECTOR_SIZE)); pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE; LogFlowFunc(("SectorsPerDataBlock=%u\n", pImage->cSectorsPerDataBlock)); /* * Every block starts with a bitmap indicating which sectors are valid and which are not. * We store the size of it to be able to calculate the real offset. */ pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8; pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE; /* Round up to full sector size */ if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0) pImage->cDataBlockBitmapSectors++; LogFlowFunc(("cbDataBlockBitmap=%u\n", pImage->cbDataBlockBitmap)); LogFlowFunc(("cDataBlockBitmapSectors=%u\n", pImage->cDataBlockBitmapSectors)); pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage); if (!pImage->pu8Bitmap) return VERR_NO_MEMORY; pBlockAllocationTable = (uint32_t *)RTMemAllocZ(pImage->cBlockAllocationTableEntries * sizeof(uint32_t)); if (!pBlockAllocationTable) return VERR_NO_MEMORY; /* * Read the table. */ uBlockAllocationTableOffset = RT_BE2H_U64(vhdDynamicDiskHeader.TableOffset); LogFlowFunc(("uBlockAllocationTableOffset=%llu\n", uBlockAllocationTableOffset)); pImage->uBlockAllocationTableOffset = uBlockAllocationTableOffset; rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, uBlockAllocationTableOffset, pBlockAllocationTable, pImage->cBlockAllocationTableEntries * sizeof(uint32_t)); /* * Because the offset entries inside the allocation table are stored big endian * we need to convert them into host endian. */ pImage->pBlockAllocationTable = (uint32_t *)RTMemAllocZ(pImage->cBlockAllocationTableEntries * sizeof(uint32_t)); if (!pImage->pBlockAllocationTable) { RTMemFree(pBlockAllocationTable); return VERR_NO_MEMORY; } for (i = 0; i < pImage->cBlockAllocationTableEntries; i++) pImage->pBlockAllocationTable[i] = RT_BE2H_U32(pBlockAllocationTable[i]); RTMemFree(pBlockAllocationTable); if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF) memcpy(pImage->ParentUuid.au8, vhdDynamicDiskHeader.ParentUuid, sizeof(pImage->ParentUuid)); return rc; } static int vhdOpenImage(PVHDIMAGE pImage, unsigned uOpenFlags) { uint64_t FileSize; VHDFooter vhdFooter; pImage->uOpenFlags = uOpenFlags; pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk); pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage); AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER); /* * Open the image. */ int rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename, VDOpenFlagsToFileOpenFlags(uOpenFlags, false /* fCreate */), &pImage->pStorage); if (RT_FAILURE(rc)) { /* Do NOT signal an appropriate error here, as the VD layer has the * choice of retrying the open if it failed. */ return rc; } rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &FileSize); pImage->uCurrentEndOfFile = FileSize - sizeof(VHDFooter); rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, &vhdFooter, sizeof(VHDFooter)); if (RT_SUCCESS(rc)) { if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0) { /* * There is also a backup header at the beginning in case the image got corrupted. * Such corrupted images are detected here to let the open handler repair it later. */ rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0, &vhdFooter, sizeof(VHDFooter)); if (RT_SUCCESS(rc)) { if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0) rc = VERR_VD_VHD_INVALID_HEADER; else rc = VERR_VD_IMAGE_CORRUPTED; } } } if (RT_FAILURE(rc)) return rc; switch (RT_BE2H_U32(vhdFooter.DiskType)) { case VHD_FOOTER_DISK_TYPE_FIXED: pImage->uImageFlags |= VD_IMAGE_FLAGS_FIXED; break; case VHD_FOOTER_DISK_TYPE_DYNAMIC: pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED; break; case VHD_FOOTER_DISK_TYPE_DIFFERENCING: pImage->uImageFlags |= VD_IMAGE_FLAGS_DIFF; pImage->uImageFlags &= ~VD_IMAGE_FLAGS_FIXED; break; default: return VERR_NOT_IMPLEMENTED; } pImage->cbSize = RT_BE2H_U64(vhdFooter.CurSize); pImage->LCHSGeometry.cCylinders = 0; pImage->LCHSGeometry.cHeads = 0; pImage->LCHSGeometry.cSectors = 0; pImage->PCHSGeometry.cCylinders = RT_BE2H_U16(vhdFooter.DiskGeometryCylinder); pImage->PCHSGeometry.cHeads = vhdFooter.DiskGeometryHeads; pImage->PCHSGeometry.cSectors = vhdFooter.DiskGeometrySectors; /* * Copy of the disk footer. * If we allocate new blocks in differencing disks on write access * the footer is overwritten. We need to write it at the end of the file. */ memcpy(&pImage->vhdFooterCopy, &vhdFooter, sizeof(VHDFooter)); /* * Is there a better way? */ memcpy(&pImage->ImageUuid, &vhdFooter.UniqueID, 16); pImage->u64DataOffset = RT_BE2H_U64(vhdFooter.DataOffset); LogFlowFunc(("DataOffset=%llu\n", pImage->u64DataOffset)); if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)) rc = vhdLoadDynamicDisk(pImage, pImage->u64DataOffset); if (RT_FAILURE(rc)) vhdFreeImage(pImage, false); return rc; } /** * Internal: Checks if a sector in the block bitmap is set */ DECLINLINE(bool) vhdBlockBitmapSectorContainsData(PVHDIMAGE pImage, uint32_t cBlockBitmapEntry) { uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */ /* * The index of the bit in the byte of the data block bitmap. * The most significant bit stands for a lower sector number. */ uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8); uint8_t *puBitmap = pImage->pu8Bitmap + iBitmap; AssertMsg(puBitmap < (pImage->pu8Bitmap + pImage->cbDataBlockBitmap), ("VHD: Current bitmap position exceeds maximum size of the bitmap\n")); return ((*puBitmap) & RT_BIT(iBitInByte)) != 0; } /** * Internal: Sets the given sector in the sector bitmap. */ DECLINLINE(bool) vhdBlockBitmapSectorSet(PVHDIMAGE pImage, uint8_t *pu8Bitmap, uint32_t cBlockBitmapEntry) { uint32_t iBitmap = (cBlockBitmapEntry / 8); /* Byte in the block bitmap. */ /* * The index of the bit in the byte of the data block bitmap. * The most significant bit stands for a lower sector number. */ uint8_t iBitInByte = (8-1) - (cBlockBitmapEntry % 8); uint8_t *puBitmap = pu8Bitmap + iBitmap; AssertMsg(puBitmap < (pu8Bitmap + pImage->cbDataBlockBitmap), ("VHD: Current bitmap position exceeds maximum size of the bitmap\n")); bool fClear = ((*puBitmap) & RT_BIT(iBitInByte)) == 0; *puBitmap |= RT_BIT(iBitInByte); return fClear; } /** * Internal: Derive drive geometry from its size. */ static void vhdSetDiskGeometry(PVHDIMAGE pImage, uint64_t cbSize) { uint64_t u64TotalSectors = cbSize / VHD_SECTOR_SIZE; uint32_t u32CylinderTimesHeads, u32Heads, u32SectorsPerTrack; if (u64TotalSectors > 65535 * 16 * 255) { /* ATA disks limited to 127 GB. */ u64TotalSectors = 65535 * 16 * 255; } if (u64TotalSectors >= 65535 * 16 * 63) { u32SectorsPerTrack = 255; u32Heads = 16; u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack; } else { u32SectorsPerTrack = 17; u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack; u32Heads = (u32CylinderTimesHeads + 1023) / 1024; if (u32Heads < 4) { u32Heads = 4; } if (u32CylinderTimesHeads >= (u32Heads * 1024) || u32Heads > 16) { u32SectorsPerTrack = 31; u32Heads = 16; u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack; } if (u32CylinderTimesHeads >= (u32Heads * 1024)) { u32SectorsPerTrack = 63; u32Heads = 16; u32CylinderTimesHeads = u64TotalSectors / u32SectorsPerTrack; } } pImage->PCHSGeometry.cCylinders = u32CylinderTimesHeads / u32Heads; pImage->PCHSGeometry.cHeads = u32Heads; pImage->PCHSGeometry.cSectors = u32SectorsPerTrack; pImage->LCHSGeometry.cCylinders = 0; pImage->LCHSGeometry.cHeads = 0; pImage->LCHSGeometry.cSectors = 0; } static uint32_t vhdAllocateParentLocators(PVHDIMAGE pImage, VHDDynamicDiskHeader *pDDH, uint64_t u64Offset) { PVHDPLE pLocator = pDDH->ParentLocatorEntry; /* * The VHD spec states that the DataSpace field holds the number of sectors * required to store the parent locator path. * As it turned out VPC and Hyper-V store the amount of bytes reserved for the * path and not the number of sectors. */ /* Unicode absolute Windows path. */ pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2KU); pLocator->u32DataSpace = RT_H2BE_U32(VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16)); pLocator->u64DataOffset = RT_H2BE_U64(u64Offset); pLocator++; u64Offset += VHD_ABSOLUTE_MAX_PATH * sizeof(RTUTF16); /* Unicode relative Windows path. */ pLocator->u32Code = RT_H2BE_U32(VHD_PLATFORM_CODE_W2RU); pLocator->u32DataSpace = RT_H2BE_U32(VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16)); pLocator->u64DataOffset = RT_H2BE_U64(u64Offset); u64Offset += VHD_RELATIVE_MAX_PATH * sizeof(RTUTF16); return u64Offset; } /** * Internal: Additional code for dynamic VHD image creation. */ static int vhdCreateDynamicImage(PVHDIMAGE pImage, uint64_t cbSize) { int rc; VHDDynamicDiskHeader DynamicDiskHeader; uint32_t u32BlockAllocationTableSectors; void *pvTmp = NULL; memset(&DynamicDiskHeader, 0, sizeof(DynamicDiskHeader)); pImage->u64DataOffset = sizeof(VHDFooter); pImage->cbDataBlock = VHD_BLOCK_SIZE; /* 2 MB */ pImage->cSectorsPerDataBlock = pImage->cbDataBlock / VHD_SECTOR_SIZE; pImage->cbDataBlockBitmap = pImage->cSectorsPerDataBlock / 8; pImage->cDataBlockBitmapSectors = pImage->cbDataBlockBitmap / VHD_SECTOR_SIZE; /* Align to sector boundary */ if (pImage->cbDataBlockBitmap % VHD_SECTOR_SIZE > 0) pImage->cDataBlockBitmapSectors++; pImage->pu8Bitmap = vhdBlockBitmapAllocate(pImage); if (!pImage->pu8Bitmap) return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for bitmap storage")); /* Initialize BAT. */ pImage->uBlockAllocationTableOffset = (uint64_t)sizeof(VHDFooter) + sizeof(VHDDynamicDiskHeader); pImage->cBlockAllocationTableEntries = (uint32_t)((cbSize + pImage->cbDataBlock - 1) / pImage->cbDataBlock); /* Align table to the block size. */ u32BlockAllocationTableSectors = (pImage->cBlockAllocationTableEntries * sizeof(uint32_t) + VHD_SECTOR_SIZE - 1) / VHD_SECTOR_SIZE; pImage->pBlockAllocationTable = (uint32_t *)RTMemAllocZ(pImage->cBlockAllocationTableEntries * sizeof(uint32_t)); if (!pImage->pBlockAllocationTable) return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot allocate memory for BAT")); for (unsigned i = 0; i < pImage->cBlockAllocationTableEntries; i++) { pImage->pBlockAllocationTable[i] = 0xFFFFFFFF; /* It is actually big endian. */ } /* Round up to the sector size. */ if (pImage->uImageFlags & VD_IMAGE_FLAGS_DIFF) /* fix hyper-v unreadable error */ pImage->uCurrentEndOfFile = vhdAllocateParentLocators(pImage, &DynamicDiskHeader, pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE); else pImage->uCurrentEndOfFile = pImage->uBlockAllocationTableOffset + u32BlockAllocationTableSectors * VHD_SECTOR_SIZE; /* Set dynamic image size. */ pvTmp = RTMemTmpAllocZ(pImage->uCurrentEndOfFile + sizeof(VHDFooter)); if (!pvTmp) return vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename); rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, pvTmp, pImage->uCurrentEndOfFile + sizeof(VHDFooter)); if (RT_FAILURE(rc)) { RTMemTmpFree(pvTmp); return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename); } RTMemTmpFree(pvTmp); /* Initialize and write the dynamic disk header. */ memcpy(DynamicDiskHeader.Cookie, VHD_DYNAMIC_DISK_HEADER_COOKIE, sizeof(DynamicDiskHeader.Cookie)); DynamicDiskHeader.DataOffset = UINT64_C(0xFFFFFFFFFFFFFFFF); /* Initially the disk has no data. */ DynamicDiskHeader.TableOffset = RT_H2BE_U64(pImage->uBlockAllocationTableOffset); DynamicDiskHeader.HeaderVersion = RT_H2BE_U32(VHD_DYNAMIC_DISK_HEADER_VERSION); DynamicDiskHeader.BlockSize = RT_H2BE_U32(pImage->cbDataBlock); DynamicDiskHeader.MaxTableEntries = RT_H2BE_U32(pImage->cBlockAllocationTableEntries); /* Compute and update checksum. */ DynamicDiskHeader.Checksum = 0; DynamicDiskHeader.Checksum = RT_H2BE_U32(vhdChecksum(&DynamicDiskHeader, sizeof(DynamicDiskHeader))); rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, sizeof(VHDFooter), &DynamicDiskHeader, sizeof(DynamicDiskHeader)); if (RT_FAILURE(rc)) return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write dynamic disk header to image '%s'"), pImage->pszFilename); /* Write BAT. */ rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset, pImage->pBlockAllocationTable, pImage->cBlockAllocationTableEntries * sizeof(uint32_t)); if (RT_FAILURE(rc)) return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write BAT to image '%s'"), pImage->pszFilename); return rc; } /** * Internal: The actual code for VHD image creation, both fixed and dynamic. */ static int vhdCreateImage(PVHDIMAGE pImage, uint64_t cbSize, unsigned uImageFlags, const char *pszComment, PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid, unsigned uOpenFlags, PFNVDPROGRESS pfnProgress, void *pvUser, unsigned uPercentStart, unsigned uPercentSpan) { int rc; VHDFooter Footer; RTTIMESPEC now; pImage->uOpenFlags = uOpenFlags; pImage->uImageFlags = uImageFlags; pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk); rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename, VDOpenFlagsToFileOpenFlags(uOpenFlags & ~VD_OPEN_FLAGS_READONLY, true /* fCreate */), &pImage->pStorage); if (RT_FAILURE(rc)) return vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot create image '%s'"), pImage->pszFilename); pImage->cbSize = cbSize; pImage->ImageUuid = *pUuid; RTUuidClear(&pImage->ParentUuid); vhdSetDiskGeometry(pImage, cbSize); /* Initialize the footer. */ memset(&Footer, 0, sizeof(Footer)); memcpy(Footer.Cookie, VHD_FOOTER_COOKIE, sizeof(Footer.Cookie)); Footer.Features = RT_H2BE_U32(0x2); Footer.Version = RT_H2BE_U32(VHD_FOOTER_FILE_FORMAT_VERSION); Footer.TimeStamp = RT_H2BE_U32(vhdRtTime2VhdTime(RTTimeNow(&now))); memcpy(Footer.CreatorApp, "vbox", sizeof(Footer.CreatorApp)); Footer.CreatorVer = RT_H2BE_U32(VBOX_VERSION); #ifdef RT_OS_DARWIN Footer.CreatorOS = RT_H2BE_U32(0x4D616320); /* "Mac " */ #else /* Virtual PC supports only two platforms atm, so everything else will be Wi2k. */ Footer.CreatorOS = RT_H2BE_U32(0x5769326B); /* "Wi2k" */ #endif Footer.OrigSize = RT_H2BE_U64(cbSize); Footer.CurSize = Footer.OrigSize; Footer.DiskGeometryCylinder = RT_H2BE_U16(pImage->PCHSGeometry.cCylinders); Footer.DiskGeometryHeads = pImage->PCHSGeometry.cHeads; Footer.DiskGeometrySectors = pImage->PCHSGeometry.cSectors; memcpy(Footer.UniqueID, pImage->ImageUuid.au8, sizeof(Footer.UniqueID)); Footer.SavedState = 0; if (uImageFlags & VD_IMAGE_FLAGS_FIXED) { Footer.DiskType = RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_FIXED); /* * Initialize fixed image. * "The size of the entire file is the size of the hard disk in * the guest operating system plus the size of the footer." */ pImage->u64DataOffset = VHD_FOOTER_DATA_OFFSET_FIXED; pImage->uCurrentEndOfFile = cbSize; /** @todo r=klaus replace this with actual data writes, see the experience * with VDI files on Windows, can cause long freezes when writing. */ rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile + sizeof(VHDFooter)); if (RT_FAILURE(rc)) { vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot set the file size for '%s'"), pImage->pszFilename); goto out; } } else { /* * Initialize dynamic image. * * The overall structure of dynamic disk is: * * [Copy of hard disk footer (512 bytes)] * [Dynamic disk header (1024 bytes)] * [BAT (Block Allocation Table)] * [Parent Locators] * [Data block 1] * [Data block 2] * ... * [Data block N] * [Hard disk footer (512 bytes)] */ Footer.DiskType = (uImageFlags & VD_IMAGE_FLAGS_DIFF) ? RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DIFFERENCING) : RT_H2BE_U32(VHD_FOOTER_DISK_TYPE_DYNAMIC); /* We are half way thorough with creation of image, let the caller know. */ if (pfnProgress) pfnProgress(pvUser, (uPercentStart + uPercentSpan) / 2); rc = vhdCreateDynamicImage(pImage, cbSize); if (RT_FAILURE(rc)) goto out; } Footer.DataOffset = RT_H2BE_U64(pImage->u64DataOffset); /* Compute and update the footer checksum. */ Footer.Checksum = 0; Footer.Checksum = RT_H2BE_U32(vhdChecksum(&Footer, sizeof(Footer))); pImage->vhdFooterCopy = Footer; /* Store the footer */ rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, &Footer, sizeof(Footer)); if (RT_FAILURE(rc)) { vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write footer to image '%s'"), pImage->pszFilename); goto out; } /* Dynamic images contain a copy of the footer at the very beginning of the file. */ if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED)) { /* Write the copy of the footer. */ rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Footer, sizeof(Footer)); if (RT_FAILURE(rc)) { vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("VHD: cannot write a copy of footer to image '%s'"), pImage->pszFilename); goto out; } } out: if (RT_SUCCESS(rc) && pfnProgress) pfnProgress(pvUser, uPercentStart + uPercentSpan); if (RT_FAILURE(rc)) vhdFreeImage(pImage, rc != VERR_ALREADY_EXISTS); return rc; } /** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */ static int vhdCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, VDTYPE *penmType) { LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage)); int rc; PVDIOSTORAGE pStorage; uint64_t cbFile; VHDFooter vhdFooter; PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage); AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER); rc = vdIfIoIntFileOpen(pIfIo, pszFilename, VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY, false /* fCreate */), &pStorage); if (RT_FAILURE(rc)) goto out; rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile); if (RT_FAILURE(rc)) { vdIfIoIntFileClose(pIfIo, pStorage); rc = VERR_VD_VHD_INVALID_HEADER; goto out; } rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter), &vhdFooter, sizeof(VHDFooter)); if (RT_SUCCESS(rc)) { if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0) { /* * There is also a backup header at the beginning in case the image got corrupted. * Such corrupted images are detected here to let the open handler repair it later. */ rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &vhdFooter, sizeof(VHDFooter)); if ( RT_FAILURE(rc) || (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0)) rc = VERR_VD_VHD_INVALID_HEADER; } if (RT_SUCCESS(rc)) *penmType = VDTYPE_HDD; } else rc = VERR_VD_VHD_INVALID_HEADER; vdIfIoIntFileClose(pIfIo, pStorage); out: LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnOpen */ static int vhdOpen(const char *pszFilename, unsigned uOpenFlags, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, VDTYPE enmType, void **ppBackendData) { LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData)); int rc = VINF_SUCCESS; PVHDIMAGE pImage; /* Check open flags. All valid flags are supported. */ if (uOpenFlags & ~VD_OPEN_FLAGS_MASK) { rc = VERR_INVALID_PARAMETER; goto out; } /* Check remaining arguments. */ if ( !VALID_PTR(pszFilename) || !*pszFilename) { rc = VERR_INVALID_PARAMETER; goto out; } pImage = (PVHDIMAGE)RTMemAllocZ(sizeof(VHDIMAGE)); if (!pImage) { rc = VERR_NO_MEMORY; goto out; } pImage->pszFilename = pszFilename; pImage->pStorage = NULL; pImage->pVDIfsDisk = pVDIfsDisk; pImage->pVDIfsImage = pVDIfsImage; rc = vhdOpenImage(pImage, uOpenFlags); if (RT_SUCCESS(rc)) *ppBackendData = pImage; else RTMemFree(pImage); out: LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnCreate */ static int vhdCreate(const char *pszFilename, uint64_t cbSize, unsigned uImageFlags, const char *pszComment, PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid, unsigned uOpenFlags, unsigned uPercentStart, unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation, void **ppBackendData) { LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p ppBackendData=%#p", pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData)); int rc = VINF_SUCCESS; PVHDIMAGE pImage; PFNVDPROGRESS pfnProgress = NULL; void *pvUser = NULL; PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation); if (pIfProgress) { pfnProgress = pIfProgress->pfnProgress; pvUser = pIfProgress->Core.pvUser; } /* Check open flags. All valid flags are supported. */ if (uOpenFlags & ~VD_OPEN_FLAGS_MASK) { rc = VERR_INVALID_PARAMETER; return rc; } /* @todo Check the values of other params */ pImage = (PVHDIMAGE)RTMemAllocZ(sizeof(VHDIMAGE)); if (!pImage) { rc = VERR_NO_MEMORY; return rc; } pImage->pszFilename = pszFilename; pImage->pStorage = NULL; pImage->pVDIfsDisk = pVDIfsDisk; pImage->pVDIfsImage = pVDIfsImage; /* Get I/O interface. */ pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage); if (RT_UNLIKELY(!VALID_PTR(pImage->pIfIo))) { RTMemFree(pImage); return VERR_INVALID_PARAMETER; } rc = vhdCreateImage(pImage, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, pfnProgress, pvUser, uPercentStart, uPercentSpan); if (RT_SUCCESS(rc)) { /* So far the image is opened in read/write mode. Make sure the * image is opened in read-only mode if the caller requested that. */ if (uOpenFlags & VD_OPEN_FLAGS_READONLY) { vhdFreeImage(pImage, false); rc = vhdOpenImage(pImage, uOpenFlags); if (RT_FAILURE(rc)) { RTMemFree(pImage); goto out; } } *ppBackendData = pImage; } else RTMemFree(pImage); out: LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnRename */ static int vhdRename(void *pBackendData, const char *pszFilename) { LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename)); int rc = VINF_SUCCESS; PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; /* Check arguments. */ if ( !pImage || !pszFilename || !*pszFilename) { rc = VERR_INVALID_PARAMETER; goto out; } /* Close the image. */ rc = vhdFreeImage(pImage, false); if (RT_FAILURE(rc)) goto out; /* Rename the file. */ rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0); if (RT_FAILURE(rc)) { /* The move failed, try to reopen the original image. */ int rc2 = vhdOpenImage(pImage, pImage->uOpenFlags); if (RT_FAILURE(rc2)) rc = rc2; goto out; } /* Update pImage with the new information. */ pImage->pszFilename = pszFilename; /* Open the old file with new name. */ rc = vhdOpenImage(pImage, pImage->uOpenFlags); if (RT_FAILURE(rc)) goto out; out: LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnClose */ static int vhdClose(void *pBackendData, bool fDelete) { LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; rc = vhdFreeImage(pImage, fDelete); RTMemFree(pImage); LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnRead */ static int vhdRead(void *pBackendData, uint64_t uOffset, size_t cbRead, PVDIOCTX pIoCtx, size_t *pcbActuallyRead) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc = VINF_SUCCESS; LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbRead=%u pcbActuallyRead=%p\n", pBackendData, uOffset, pIoCtx, cbRead, pcbActuallyRead)); if (uOffset + cbRead > pImage->cbSize) return VERR_INVALID_PARAMETER; /* * If we have a dynamic disk image, we need to find the data block and sector to read. */ if (pImage->pBlockAllocationTable) { /* * Get the data block first. */ uint32_t cBlockAllocationTableEntry = (uOffset / VHD_SECTOR_SIZE) / pImage->cSectorsPerDataBlock; uint32_t cBATEntryIndex = (uOffset / VHD_SECTOR_SIZE) % pImage->cSectorsPerDataBlock; uint64_t uVhdOffset; LogFlowFunc(("cBlockAllocationTableEntry=%u cBatEntryIndex=%u\n", cBlockAllocationTableEntry, cBATEntryIndex)); LogFlowFunc(("BlockAllocationEntry=%u\n", pImage->pBlockAllocationTable[cBlockAllocationTableEntry])); /* * Clip read range to remain in this data block. */ cbRead = RT_MIN(cbRead, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE))); /* * If the block is not allocated the content of the entry is ~0 */ if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U) rc = VERR_VD_BLOCK_FREE; else { uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE; LogFlowFunc(("uVhdOffset=%llu cbRead=%u\n", uVhdOffset, cbRead)); /* Read in the block's bitmap. */ PVDMETAXFER pMetaXfer; rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage, ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE, pImage->pu8Bitmap, pImage->cbDataBlockBitmap, pIoCtx, &pMetaXfer, NULL, NULL); if (RT_SUCCESS(rc)) { uint32_t cSectors = 0; vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer); if (vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex)) { cBATEntryIndex++; cSectors = 1; /* * The first sector being read is marked dirty, read as much as we * can from child. Note that only sectors that are marked dirty * must be read from child. */ while ( (cSectors < (cbRead / VHD_SECTOR_SIZE)) && vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex)) { cBATEntryIndex++; cSectors++; } cbRead = cSectors * VHD_SECTOR_SIZE; LogFlowFunc(("uVhdOffset=%llu cbRead=%u\n", uVhdOffset, cbRead)); rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, uVhdOffset, pIoCtx, cbRead); } else { /* * The first sector being read is marked clean, so we should read from * our parent instead, but only as much as there are the following * clean sectors, because the block may still contain dirty sectors * further on. We just need to compute the number of clean sectors * and pass it to our caller along with the notification that they * should be read from the parent. */ cBATEntryIndex++; cSectors = 1; while ( (cSectors < (cbRead / VHD_SECTOR_SIZE)) && !vhdBlockBitmapSectorContainsData(pImage, cBATEntryIndex)) { cBATEntryIndex++; cSectors++; } cbRead = cSectors * VHD_SECTOR_SIZE; LogFunc(("Sectors free: uVhdOffset=%llu cbRead=%u\n", uVhdOffset, cbRead)); rc = VERR_VD_BLOCK_FREE; } } else AssertMsg(rc == VERR_VD_NOT_ENOUGH_METADATA, ("Reading block bitmap failed rc=%Rrc\n", rc)); } } else rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, uOffset, pIoCtx, cbRead); if (pcbActuallyRead) *pcbActuallyRead = cbRead; LogFlowFunc(("returns rc=%Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnWrite */ static int vhdWrite(void *pBackendData, uint64_t uOffset, size_t cbWrite, PVDIOCTX pIoCtx, size_t *pcbWriteProcess, size_t *pcbPreRead, size_t *pcbPostRead, unsigned fWrite) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc = VINF_SUCCESS; LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n", pBackendData, uOffset, pIoCtx, cbWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite)); AssertPtr(pImage); Assert(uOffset % VHD_SECTOR_SIZE == 0); Assert(cbWrite % VHD_SECTOR_SIZE == 0); if (pImage->pBlockAllocationTable) { /* * Get the data block first. */ uint32_t cSector = uOffset / VHD_SECTOR_SIZE; uint32_t cBlockAllocationTableEntry = cSector / pImage->cSectorsPerDataBlock; uint32_t cBATEntryIndex = cSector % pImage->cSectorsPerDataBlock; uint64_t uVhdOffset; /* * Clip write range. */ cbWrite = RT_MIN(cbWrite, (pImage->cbDataBlock - (cBATEntryIndex * VHD_SECTOR_SIZE))); /* * If the block is not allocated the content of the entry is ~0 * and we need to allocate a new block. Note that while blocks are * allocated with a relatively big granularity, each sector has its * own bitmap entry, indicating whether it has been written or not. * So that means for the purposes of the higher level that the * granularity is invisible. This means there's no need to return * VERR_VD_BLOCK_FREE unless the block hasn't been allocated yet. */ if (pImage->pBlockAllocationTable[cBlockAllocationTableEntry] == ~0U) { /* Check if the block allocation should be suppressed. */ if ( (fWrite & VD_WRITE_NO_ALLOC) || (cbWrite != pImage->cbDataBlock)) { *pcbPreRead = cBATEntryIndex * VHD_SECTOR_SIZE; *pcbPostRead = pImage->cSectorsPerDataBlock * VHD_SECTOR_SIZE - cbWrite - *pcbPreRead; if (pcbWriteProcess) *pcbWriteProcess = cbWrite; return VERR_VD_BLOCK_FREE; } PVHDIMAGEEXPAND pExpand = (PVHDIMAGEEXPAND)RTMemAllocZ(RT_OFFSETOF(VHDIMAGEEXPAND, au8Bitmap[pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE])); bool fIoInProgress = false; if (!pExpand) return VERR_NO_MEMORY; pExpand->cbEofOld = pImage->uCurrentEndOfFile; pExpand->idxBatAllocated = cBlockAllocationTableEntry; pExpand->idxBlockBe = RT_H2BE_U32(pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE); /* Set the bits for all sectors having been written. */ for (uint32_t iSector = 0; iSector < (cbWrite / VHD_SECTOR_SIZE); iSector++) { /* No need to check for a changed value because this is an initial write. */ vhdBlockBitmapSectorSet(pImage, pExpand->au8Bitmap, cBATEntryIndex); cBATEntryIndex++; } do { /* * Start with the sector bitmap. */ rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, pExpand->au8Bitmap, pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE, pIoCtx, vhdAsyncExpansionDataBlockBitmapComplete, pExpand); if (RT_SUCCESS(rc)) VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS); else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS) fIoInProgress = true; else { VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BLOCKBITMAP_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); break; } /* * Write the new block at the current end of the file. */ rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile + (pImage->cDataBlockBitmapSectors + (cSector % pImage->cSectorsPerDataBlock)) * VHD_SECTOR_SIZE, pIoCtx, cbWrite, vhdAsyncExpansionDataComplete, pExpand); if (RT_SUCCESS(rc)) VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS); else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS) fIoInProgress = true; else { VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_USERBLOCK_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); break; } /* * Write entry in the BAT. */ rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset + cBlockAllocationTableEntry * sizeof(uint32_t), &pExpand->idxBlockBe, sizeof(uint32_t), pIoCtx, vhdAsyncExpansionBatUpdateComplete, pExpand); if (RT_SUCCESS(rc)) VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS); else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS) fIoInProgress = true; else { VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_BAT_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); break; } /* * Set the new end of the file and link the new block into the BAT. */ pImage->uCurrentEndOfFile += pImage->cDataBlockBitmapSectors * VHD_SECTOR_SIZE + pImage->cbDataBlock; /* Update the footer. */ rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, &pImage->vhdFooterCopy, sizeof(VHDFooter), pIoCtx, vhdAsyncExpansionFooterUpdateComplete, pExpand); if (RT_SUCCESS(rc)) VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_SUCCESS); else if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS) fIoInProgress = true; else { VHDIMAGEEXPAND_STATUS_SET(pExpand->fFlags, VHDIMAGEEXPAND_FOOTER_STATUS_SHIFT, VHDIMAGEEXPAND_STEP_FAILED); break; } } while (0); if (!fIoInProgress) vhdAsyncExpansionComplete(pImage, pIoCtx, pExpand); else rc = VERR_VD_ASYNC_IO_IN_PROGRESS; } else { /* * Calculate the real offset in the file. */ uVhdOffset = ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry] + pImage->cDataBlockBitmapSectors + cBATEntryIndex) * VHD_SECTOR_SIZE; /* Read in the block's bitmap. */ PVDMETAXFER pMetaXfer; rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage, ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE, pImage->pu8Bitmap, pImage->cbDataBlockBitmap, pIoCtx, &pMetaXfer, NULL, NULL); if (RT_SUCCESS(rc)) { vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer); /* Write data. */ rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage, uVhdOffset, pIoCtx, cbWrite, NULL, NULL); if (RT_SUCCESS(rc) || rc == VERR_VD_ASYNC_IO_IN_PROGRESS) { bool fChanged = false; /* Set the bits for all sectors having been written. */ for (uint32_t iSector = 0; iSector < (cbWrite / VHD_SECTOR_SIZE); iSector++) { fChanged |= vhdBlockBitmapSectorSet(pImage, pImage->pu8Bitmap, cBATEntryIndex); cBATEntryIndex++; } /* Only write the bitmap if it was changed. */ if (fChanged) { /* * Write the bitmap back. * * @note We don't have a completion callback here because we * can't do anything if the write fails for some reason. * The error will propagated to the device/guest * by the generic VD layer already and we don't need * to rollback anything here. */ rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage, ((uint64_t)pImage->pBlockAllocationTable[cBlockAllocationTableEntry]) * VHD_SECTOR_SIZE, pImage->pu8Bitmap, pImage->cbDataBlockBitmap, pIoCtx, NULL, NULL); } } } } } else rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage, uOffset, pIoCtx, cbWrite, NULL, NULL); if (pcbWriteProcess) *pcbWriteProcess = cbWrite; /* Stay on the safe side. Do not run the risk of confusing the higher * level, as that can be pretty lethal to image consistency. */ *pcbPreRead = 0; *pcbPostRead = 0; return rc; } /** @copydoc VBOXHDDBACKEND::pfnFlush */ static int vhdFlush(void *pBackendData, PVDIOCTX pIoCtx) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; /* No need to write anything here. Data is always updated on a write. */ return vdIfIoIntFileFlush(pImage->pIfIo, pImage->pStorage, pIoCtx, NULL, NULL); } /** @copydoc VBOXHDDBACKEND::pfnGetVersion */ static unsigned vhdGetVersion(void *pBackendData) { LogFlowFunc(("pBackendData=%#p\n", pBackendData)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; unsigned ver = 0; AssertPtr(pImage); if (pImage) ver = 1; /**< @todo use correct version */ LogFlowFunc(("returns %u\n", ver)); return ver; } /** @copydoc VBOXHDDBACKEND::pfnGetSectorSize */ static uint32_t vhdGetSectorSize(void *pBackendData) { LogFlowFunc(("pBackendData=%#p\n", pBackendData)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; uint32_t cb = 0; AssertPtr(pImage); if (pImage) cb = 512; LogFlowFunc(("returns %zu\n", cb)); return cb; } /** @copydoc VBOXHDDBACKEND::pfnGetSize */ static uint64_t vhdGetSize(void *pBackendData) { LogFlowFunc(("pBackendData=%#p\n", pBackendData)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; uint64_t cb = 0; AssertPtr(pImage); if (pImage && pImage->pStorage) cb = pImage->cbSize; LogFlowFunc(("returns %llu\n", cb)); return cb; } /** @copydoc VBOXHDDBACKEND::pfnGetFileSize */ static uint64_t vhdGetFileSize(void *pBackendData) { LogFlowFunc(("pBackendData=%#p\n", pBackendData)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; uint64_t cb = 0; AssertPtr(pImage); if (pImage && pImage->pStorage) cb = pImage->uCurrentEndOfFile + sizeof(VHDFooter); LogFlowFunc(("returns %lld\n", cb)); return cb; } /** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */ static int vhdGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry) { LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (pImage->PCHSGeometry.cCylinders) { *pPCHSGeometry = pImage->PCHSGeometry; rc = VINF_SUCCESS; } else rc = VERR_VD_GEOMETRY_NOT_SET; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */ static int vhdSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry) { LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) { rc = VERR_VD_IMAGE_READ_ONLY; goto out; } pImage->PCHSGeometry = *pPCHSGeometry; rc = VINF_SUCCESS; } else rc = VERR_VD_NOT_OPENED; out: LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */ static int vhdGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry) { LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (pImage->LCHSGeometry.cCylinders) { *pLCHSGeometry = pImage->LCHSGeometry; rc = VINF_SUCCESS; } else rc = VERR_VD_GEOMETRY_NOT_SET; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc (CHS=%u/%u/%u)\n", rc, pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */ static int vhdSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) { rc = VERR_VD_IMAGE_READ_ONLY; goto out; } pImage->LCHSGeometry = *pLCHSGeometry; rc = VINF_SUCCESS; } else rc = VERR_VD_NOT_OPENED; out: LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */ static unsigned vhdGetImageFlags(void *pBackendData) { LogFlowFunc(("pBackendData=%#p\n", pBackendData)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; unsigned uImageFlags; AssertPtr(pImage); if (pImage) uImageFlags = pImage->uImageFlags; else uImageFlags = 0; LogFlowFunc(("returns %#x\n", uImageFlags)); return uImageFlags; } /** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */ static unsigned vhdGetOpenFlags(void *pBackendData) { LogFlowFunc(("pBackendData=%#p\n", pBackendData)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; unsigned uOpenFlags; AssertPtr(pImage); if (pImage) uOpenFlags = pImage->uOpenFlags; else uOpenFlags = 0; LogFlowFunc(("returns %#x\n", uOpenFlags)); return uOpenFlags; } /** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */ static int vhdSetOpenFlags(void *pBackendData, unsigned uOpenFlags) { LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; /* Image must be opened and the new flags must be valid. */ if (!pImage || (uOpenFlags & ~( VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO | VD_OPEN_FLAGS_ASYNC_IO | VD_OPEN_FLAGS_SHAREABLE | VD_OPEN_FLAGS_SEQUENTIAL | VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS))) { rc = VERR_INVALID_PARAMETER; goto out; } /* Implement this operation via reopening the image. */ rc = vhdFreeImage(pImage, false); if (RT_FAILURE(rc)) goto out; rc = vhdOpenImage(pImage, uOpenFlags); out: LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetComment */ static int vhdGetComment(void *pBackendData, char *pszComment, size_t cbComment) { LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) rc = VERR_NOT_SUPPORTED; else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc comment='%s'\n", rc, pszComment)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetComment */ static int vhdSetComment(void *pBackendData, const char *pszComment) { LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) rc = VERR_VD_IMAGE_READ_ONLY; else rc = VERR_NOT_SUPPORTED; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetUuid */ static int vhdGetUuid(void *pBackendData, PRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { *pUuid = pImage->ImageUuid; rc = VINF_SUCCESS; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetUuid */ static int vhdSetUuid(void *pBackendData, PCRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)) { pImage->ImageUuid = *pUuid; /* Update the footer copy. It will get written to disk when the image is closed. */ memcpy(&pImage->vhdFooterCopy.UniqueID, pUuid, 16); /* Update checksum. */ pImage->vhdFooterCopy.Checksum = 0; pImage->vhdFooterCopy.Checksum = RT_H2BE_U32(vhdChecksum(&pImage->vhdFooterCopy, sizeof(VHDFooter))); /* Need to update the dynamic disk header to update the disk footer copy at the beginning. */ if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)) pImage->fDynHdrNeedsUpdate = true; rc = VINF_SUCCESS; } else rc = VERR_VD_IMAGE_READ_ONLY; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */ static int vhdGetModificationUuid(void *pBackendData, PRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) rc = VERR_NOT_SUPPORTED; else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */ static int vhdSetModificationUuid(void *pBackendData, PCRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)) rc = VERR_NOT_SUPPORTED; else rc = VERR_VD_IMAGE_READ_ONLY; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */ static int vhdGetParentUuid(void *pBackendData, PRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { *pUuid = pImage->ParentUuid; rc = VINF_SUCCESS; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */ static int vhdSetParentUuid(void *pBackendData, PCRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc = VINF_SUCCESS; AssertPtr(pImage); if (pImage && pImage->pStorage) { if (!(pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED)) { pImage->ParentUuid = *pUuid; pImage->fDynHdrNeedsUpdate = true; } else rc = VERR_VD_IMAGE_READ_ONLY; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */ static int vhdGetParentModificationUuid(void *pBackendData, PRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) rc = VERR_NOT_SUPPORTED; else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */ static int vhdSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid) { LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid)); PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc; AssertPtr(pImage); if (pImage) { if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)) rc = VERR_NOT_SUPPORTED; else rc = VERR_VD_IMAGE_READ_ONLY; } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnDump */ static void vhdDump(void *pBackendData) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; AssertPtr(pImage); if (pImage) { vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%u\n", pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors, pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors, VHD_SECTOR_SIZE); vdIfErrorMessage(pImage->pIfError, "Header: uuidCreation={%RTuuid}\n", &pImage->ImageUuid); vdIfErrorMessage(pImage->pIfError, "Header: uuidParent={%RTuuid}\n", &pImage->ParentUuid); } } /** @copydoc VBOXHDDBACKEND::pfnGetTimestamp */ static int vhdGetTimeStamp(void *pBackendData, PRTTIMESPEC pTimeStamp) { int rc = VINF_SUCCESS; PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; AssertPtr(pImage); if (pImage) rc = vdIfIoIntFileGetModificationTime(pImage->pIfIo, pImage->pszFilename, pTimeStamp); else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetParentTimeStamp */ static int vhdGetParentTimeStamp(void *pBackendData, PRTTIMESPEC pTimeStamp) { int rc = VINF_SUCCESS; PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; AssertPtr(pImage); if (pImage) vhdTime2RtTime(pTimeStamp, pImage->u32ParentTimeStamp); else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetParentTimeStamp */ static int vhdSetParentTimeStamp(void *pBackendData, PCRTTIMESPEC pTimeStamp) { int rc = VINF_SUCCESS; PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; AssertPtr(pImage); if (pImage) { if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) rc = VERR_VD_IMAGE_READ_ONLY; else { pImage->u32ParentTimeStamp = vhdRtTime2VhdTime(pTimeStamp); pImage->fDynHdrNeedsUpdate = true; } } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnGetParentFilename */ static int vhdGetParentFilename(void *pBackendData, char **ppszParentFilename) { int rc = VINF_SUCCESS; PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; AssertPtr(pImage); if (pImage) *ppszParentFilename = RTStrDup(pImage->pszParentFilename); else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnSetParentFilename */ static int vhdSetParentFilename(void *pBackendData, const char *pszParentFilename) { int rc = VINF_SUCCESS; PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; AssertPtr(pImage); if (pImage) { if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY) rc = VERR_VD_IMAGE_READ_ONLY; else { if (pImage->pszParentFilename) RTStrFree(pImage->pszParentFilename); pImage->pszParentFilename = RTStrDup(pszParentFilename); if (!pImage->pszParentFilename) rc = VERR_NO_MEMORY; else pImage->fDynHdrNeedsUpdate = true; } } else rc = VERR_VD_NOT_OPENED; LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnCompact */ static int vhdCompact(void *pBackendData, unsigned uPercentStart, unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc = VINF_SUCCESS; void *pvBuf = NULL, *pvReplace = NULL; uint32_t *paBlocks = NULL; int (*pfnParentRead)(void *, uint64_t, void *, size_t) = NULL; void *pvParent = NULL; PVDINTERFACEPARENTSTATE pIfParentState = VDIfParentStateGet(pVDIfsOperation); if (pIfParentState) { pfnParentRead = pIfParentState->pfnParentRead; pvParent = pIfParentState->Core.pvUser; } PFNVDPROGRESS pfnProgress = NULL; void *pvUser = NULL; PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation); if (pIfProgress) { pfnProgress = pIfProgress->pfnProgress; pvUser = pIfProgress->Core.pvUser; } do { AssertBreakStmt(pImage, rc = VERR_INVALID_PARAMETER); AssertBreakStmt(!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY), rc = VERR_VD_IMAGE_READ_ONLY); /* Reject fixed images as they don't have a BAT. */ if (pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED) { rc = VERR_NOT_SUPPORTED; break; } if (pfnParentRead) { pvParent = RTMemTmpAlloc(pImage->cbDataBlock); AssertBreakStmt(pvParent, rc = VERR_NO_MEMORY); } pvBuf = RTMemTmpAlloc(pImage->cbDataBlock); AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY); unsigned cBlocksAllocated = 0; unsigned cBlocksToMove = 0; unsigned cBlocks = pImage->cBlockAllocationTableEntries; uint32_t offBlocksStart = ~0U; /* Start offset of data blocks in sectors. */ uint32_t *paBat = pImage->pBlockAllocationTable; /* Count the number of allocated blocks and find the start offset for the data blocks. */ for (unsigned i = 0; i < cBlocks; i++) if (paBat[i] != ~0U) { cBlocksAllocated++; if (paBat[i] < offBlocksStart) offBlocksStart = paBat[i]; } if (!cBlocksAllocated) { /* Nothing to do. */ rc = VINF_SUCCESS; break; } paBlocks = (uint32_t *)RTMemTmpAllocZ(cBlocksAllocated * sizeof(uint32_t)); AssertBreakStmt(paBlocks, rc = VERR_NO_MEMORY); /* Invalidate the back resolving array. */ for (unsigned i = 0; i < cBlocksAllocated; i++) paBlocks[i] = ~0U; /* Fill the back resolving table. */ for (unsigned i = 0; i < cBlocks; i++) if (paBat[i] != ~0U) { unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock; if ( idxBlock < cBlocksAllocated && paBlocks[idxBlock] == ~0U) paBlocks[idxBlock] = i; else { /* The image is in an inconsistent state. Don't go further. */ rc = VERR_INVALID_STATE; break; } } if (RT_FAILURE(rc)) break; /* Find redundant information and update the block pointers * accordingly, creating bubbles. Keep disk up to date, as this * enables cancelling. */ for (unsigned i = 0; i < cBlocks; i++) { if (paBat[i] != ~0U) { unsigned idxBlock = (paBat[i] - offBlocksStart) / pImage->cSectorsPerDataBlock; /* Block present in image file, read relevant data. */ uint64_t u64Offset = ((uint64_t)paBat[i] + pImage->cDataBlockBitmapSectors) * VHD_SECTOR_SIZE; rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset, pvBuf, pImage->cbDataBlock); if (RT_FAILURE(rc)) break; if (ASMBitFirstSet((volatile void *)pvBuf, (uint32_t)pImage->cbDataBlock * 8) == -1) { paBat[i] = ~0; paBlocks[idxBlock] = ~0U; /* Adjust progress info, one block to be relocated. */ cBlocksToMove++; } else if (pfnParentRead) { rc = pfnParentRead(pvParent, (uint64_t)i * pImage->cbDataBlock, pvParent, pImage->cbDataBlock); if (RT_FAILURE(rc)) break; if (!memcmp(pvParent, pvBuf, pImage->cbDataBlock)) { paBat[i] = ~0U; paBlocks[idxBlock] = ~0U; /* Adjust progress info, one block to be relocated. */ cBlocksToMove++; } } } if (pIfProgress && pIfProgress->pfnProgress) { rc = pIfProgress->pfnProgress(pIfProgress->Core.pvUser, (uint64_t)i * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart); if (RT_FAILURE(rc)) break; } } if (RT_SUCCESS(rc)) { /* Fill bubbles with other data (if available). */ unsigned cBlocksMoved = 0; unsigned uBlockUsedPos = cBlocksAllocated; size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of whole block containing the bitmap and the user data. */ /* Allocate data buffer to hold the data block and allocation bitmap in front of the actual data. */ RTMemTmpFree(pvBuf); pvBuf = RTMemTmpAllocZ(cbBlock); AssertBreakStmt(pvBuf, rc = VERR_NO_MEMORY); for (unsigned i = 0; i < cBlocksAllocated; i++) { unsigned uBlock = paBlocks[i]; if (uBlock == ~0U) { unsigned uBlockData = ~0U; while (uBlockUsedPos > i && uBlockData == ~0U) { uBlockUsedPos--; uBlockData = paBlocks[uBlockUsedPos]; } /* Terminate early if there is no block which needs copying. */ if (uBlockUsedPos == i) break; uint64_t u64Offset = (uint64_t)uBlockUsedPos * cbBlock + (offBlocksStart * VHD_SECTOR_SIZE); rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, u64Offset, pvBuf, cbBlock); if (RT_FAILURE(rc)) break; u64Offset = (uint64_t)i * cbBlock + (offBlocksStart * VHD_SECTOR_SIZE); rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, u64Offset, pvBuf, cbBlock); if (RT_FAILURE(rc)) break; paBat[uBlockData] = i*(pImage->cSectorsPerDataBlock + pImage->cDataBlockBitmapSectors) + offBlocksStart; /* Truncate the file but leave enough room for the footer to avoid * races if other processes fill the whole harddisk. */ rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile - cbBlock + VHD_SECTOR_SIZE); if (RT_FAILURE(rc)) break; /* Update pointers and write footer. */ pImage->uCurrentEndOfFile -= cbBlock; /* We're kinda screwed if this failes. */ rc = vhdUpdateFooter(pImage); if (RT_FAILURE(rc)) break; paBlocks[i] = uBlockData; paBlocks[uBlockUsedPos] = ~0U; cBlocksMoved++; } if (pIfProgress && pIfProgress->pfnProgress) { rc = pIfProgress->pfnProgress(pIfProgress->Core.pvUser, (uint64_t)(cBlocks + cBlocksMoved) * uPercentSpan / (cBlocks + cBlocksToMove) + uPercentStart); if (RT_FAILURE(rc)) break; } } } /* Write the new BAT in any case. */ rc = vhdFlushImage(pImage); } while (0); if (paBlocks) RTMemTmpFree(paBlocks); if (pvParent) RTMemTmpFree(pvParent); if (pvBuf) RTMemTmpFree(pvBuf); if (RT_SUCCESS(rc) && pIfProgress && pIfProgress->pfnProgress) { pIfProgress->pfnProgress(pIfProgress->Core.pvUser, uPercentStart + uPercentSpan); } LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnResize */ static int vhdResize(void *pBackendData, uint64_t cbSize, PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry, unsigned uPercentStart, unsigned uPercentSpan, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation) { PVHDIMAGE pImage = (PVHDIMAGE)pBackendData; int rc = VINF_SUCCESS; PFNVDPROGRESS pfnProgress = NULL; void *pvUser = NULL; PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation); if (pIfProgress) { pfnProgress = pIfProgress->pfnProgress; pvUser = pIfProgress->Core.pvUser; } /* Making the image smaller is not supported at the moment. */ if ( cbSize < pImage->cbSize || pImage->uImageFlags & VD_IMAGE_FLAGS_FIXED) rc = VERR_NOT_SUPPORTED; else if (cbSize > pImage->cbSize) { unsigned cBlocksAllocated = 0; size_t cbBlock = pImage->cbDataBlock + pImage->cbDataBlockBitmap; /** < Size of a block including the sector bitmap. */ uint32_t cBlocksNew = cbSize / pImage->cbDataBlock; /** < New number of blocks in the image after the resize */ if (cbSize % pImage->cbDataBlock) cBlocksNew++; uint32_t cBlocksOld = pImage->cBlockAllocationTableEntries; /** < Number of blocks before the resize. */ uint64_t cbBlockspaceNew = RT_ALIGN_32(cBlocksNew * sizeof(uint32_t), VHD_SECTOR_SIZE); /** < Required space for the block array after the resize. */ uint64_t offStartDataNew = RT_ALIGN_32(pImage->uBlockAllocationTableOffset + cbBlockspaceNew, VHD_SECTOR_SIZE); /** < New start offset for block data after the resize */ uint64_t offStartDataOld = ~0ULL; /* Go through the BAT and find the data start offset. */ for (unsigned idxBlock = 0; idxBlock < pImage->cBlockAllocationTableEntries; idxBlock++) { if (pImage->pBlockAllocationTable[idxBlock] != ~0U) { uint64_t offStartBlock = (uint64_t)pImage->pBlockAllocationTable[idxBlock] * VHD_SECTOR_SIZE; if (offStartBlock < offStartDataOld) offStartDataOld = offStartBlock; cBlocksAllocated++; } } if ( offStartDataOld != offStartDataNew && cBlocksAllocated > 0) { /* Calculate how many sectors nee to be relocated. */ uint64_t cbOverlapping = offStartDataNew - offStartDataOld; unsigned cBlocksReloc = (unsigned)(cbOverlapping / cbBlock); if (cbOverlapping % cbBlock) cBlocksReloc++; cBlocksReloc = RT_MIN(cBlocksReloc, cBlocksAllocated); offStartDataNew = offStartDataOld; /* Do the relocation. */ LogFlow(("Relocating %u blocks\n", cBlocksReloc)); /* * Get the blocks we need to relocate first, they are appended to the end * of the image. */ void *pvBuf = NULL, *pvZero = NULL; do { /* Allocate data buffer. */ pvBuf = RTMemAllocZ(cbBlock); if (!pvBuf) { rc = VERR_NO_MEMORY; break; } /* Allocate buffer for overwriting with zeroes. */ pvZero = RTMemAllocZ(cbBlock); if (!pvZero) { rc = VERR_NO_MEMORY; break; } for (unsigned i = 0; i < cBlocksReloc; i++) { uint32_t uBlock = offStartDataNew / VHD_SECTOR_SIZE; /* Search the index in the block table. */ for (unsigned idxBlock = 0; idxBlock < cBlocksOld; idxBlock++) { if (pImage->pBlockAllocationTable[idxBlock] == uBlock) { /* Read data and append to the end of the image. */ rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, offStartDataNew, pvBuf, cbBlock); if (RT_FAILURE(rc)) break; rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uCurrentEndOfFile, pvBuf, cbBlock); if (RT_FAILURE(rc)) break; /* Zero out the old block area. */ rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, offStartDataNew, pvZero, cbBlock); if (RT_FAILURE(rc)) break; /* Update block counter. */ pImage->pBlockAllocationTable[idxBlock] = pImage->uCurrentEndOfFile / VHD_SECTOR_SIZE; pImage->uCurrentEndOfFile += cbBlock; /* Continue with the next block. */ break; } } if (RT_FAILURE(rc)) break; offStartDataNew += cbBlock; } } while (0); if (pvBuf) RTMemFree(pvBuf); if (pvZero) RTMemFree(pvZero); } /* * Relocation done, expand the block array and update the header with * the new data. */ if (RT_SUCCESS(rc)) { uint32_t *paBlocksNew = (uint32_t *)RTMemRealloc(pImage->pBlockAllocationTable, cBlocksNew * sizeof(uint32_t)); if (paBlocksNew) { pImage->pBlockAllocationTable = paBlocksNew; /* Mark the new blocks as unallocated. */ for (unsigned idxBlock = cBlocksOld; idxBlock < cBlocksNew; idxBlock++) pImage->pBlockAllocationTable[idxBlock] = ~0U; } else rc = VERR_NO_MEMORY; if (RT_SUCCESS(rc)) { /* Write the block array before updating the rest. */ rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->uBlockAllocationTableOffset, pImage->pBlockAllocationTable, cBlocksNew * sizeof(uint32_t)); } if (RT_SUCCESS(rc)) { /* Update size and new block count. */ pImage->cBlockAllocationTableEntries = cBlocksNew; pImage->cbSize = cbSize; /* Update geometry. */ pImage->PCHSGeometry = *pPCHSGeometry; pImage->LCHSGeometry = *pLCHSGeometry; } } /* Update header information in base image file. */ pImage->fDynHdrNeedsUpdate = true; vhdFlushImage(pImage); } /* Same size doesn't change the image at all. */ LogFlowFunc(("returns %Rrc\n", rc)); return rc; } /** @copydoc VBOXHDDBACKEND::pfnRepair */ static DECLCALLBACK(int) vhdRepair(const char *pszFilename, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, uint32_t fFlags) { LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage)); int rc; PVDINTERFACEERROR pIfError; PVDINTERFACEIOINT pIfIo; PVDIOSTORAGE pStorage; uint64_t cbFile; VHDFooter vhdFooter; VHDDynamicDiskHeader dynamicDiskHeader; uint32_t *paBat = NULL; uint32_t *pu32BlockBitmap = NULL; pIfIo = VDIfIoIntGet(pVDIfsImage); AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER); pIfError = VDIfErrorGet(pVDIfsDisk); do { uint64_t offDynamicDiskHeader = 0; uint64_t offBat = 0; uint64_t offFooter = 0; uint32_t cBatEntries = 0; bool fDynamic = false; bool fRepairFooter = false; bool fRepairBat = false; bool fRepairDynHeader = false; rc = vdIfIoIntFileOpen(pIfIo, pszFilename, VDOpenFlagsToFileOpenFlags( fFlags & VD_REPAIR_DRY_RUN ? VD_OPEN_FLAGS_READONLY : 0, false /* fCreate */), &pStorage); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to open image \"%s\"", pszFilename); break; } rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to query image size"); break; } if (cbFile < sizeof(VHDFooter)) { rc = vdIfError(pIfError, VERR_VD_INVALID_SIZE, RT_SRC_POS, "Image must be at least %u bytes (got %llu)", sizeof(VHDFooter), cbFile); break; } rc = vdIfIoIntFileReadSync(pIfIo, pStorage, cbFile - sizeof(VHDFooter), &vhdFooter, sizeof(VHDFooter)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read footer of image"); break; } if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0) { /* Dynamic images have a backup at the beginning of the image. */ rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &vhdFooter, sizeof(VHDFooter)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, rc, RT_SRC_POS, "Failed to read header of image"); break; } /* * Check for the header, if this fails the image is either completely corrupted * and impossible to repair or in another format. */ if (memcmp(vhdFooter.Cookie, VHD_FOOTER_COOKIE, VHD_FOOTER_COOKIE_SIZE) != 0) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "No valid VHD structures found"); break; } else vdIfErrorMessage(pIfError, "Missing footer structure, using backup\n"); /* Remember to fix the footer structure. */ fRepairFooter = true; } offFooter = cbFile - sizeof(VHDFooter); /* Verify that checksums match. */ uint32_t u32ChkSumOld = RT_BE2H_U32(vhdFooter.Checksum); vhdFooter.Checksum = 0; uint32_t u32ChkSum = vhdChecksum(&vhdFooter, sizeof(VHDFooter)); vhdFooter.Checksum = RT_H2BE_U32(u32ChkSum); if (u32ChkSumOld != u32ChkSum) { vdIfErrorMessage(pIfError, "Checksum is invalid (should be %u got %u), repairing\n", u32ChkSum, u32ChkSumOld); fRepairFooter = true; break; } switch (RT_BE2H_U32(vhdFooter.DiskType)) { case VHD_FOOTER_DISK_TYPE_FIXED: fDynamic = false; break; case VHD_FOOTER_DISK_TYPE_DYNAMIC: fDynamic = true; break; case VHD_FOOTER_DISK_TYPE_DIFFERENCING: fDynamic = true; break; default: { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "VHD image type %u is not supported", RT_BE2H_U32(vhdFooter.DiskType)); break; } } /* Load and check dynamic disk header if required. */ if (fDynamic) { size_t cbBlock; offDynamicDiskHeader = RT_BE2H_U64(vhdFooter.DataOffset); if (offDynamicDiskHeader + sizeof(VHDDynamicDiskHeader) > cbFile) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "VHD image type is not supported"); break; } rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offDynamicDiskHeader, &dynamicDiskHeader, sizeof(VHDDynamicDiskHeader)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Failed to read dynamic disk header (at %llu), %Rrc", offDynamicDiskHeader, rc); break; } /* Verify that checksums match. */ u32ChkSumOld = RT_BE2H_U32(dynamicDiskHeader.Checksum); dynamicDiskHeader.Checksum = 0; u32ChkSum = vhdChecksum(&dynamicDiskHeader, sizeof(VHDDynamicDiskHeader)); dynamicDiskHeader.Checksum = RT_H2BE_U32(u32ChkSum); if (u32ChkSumOld != u32ChkSum) { vdIfErrorMessage(pIfError, "Checksum of dynamic disk header is invalid (should be %u got %u), repairing\n", u32ChkSum, u32ChkSumOld); fRepairDynHeader = true; break; } /* Read the block allocation table and fix any inconsistencies. */ offBat = RT_BE2H_U64(dynamicDiskHeader.TableOffset); cBatEntries = RT_BE2H_U32(dynamicDiskHeader.MaxTableEntries); cbBlock = RT_BE2H_U32(dynamicDiskHeader.BlockSize); cbBlock += cbBlock / VHD_SECTOR_SIZE / 8; if (offBat + cBatEntries * sizeof(uint32_t) > cbFile) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Block allocation table is not inside the image"); break; } paBat = (uint32_t *)RTMemAllocZ(cBatEntries * sizeof(uint32_t)); if (!paBat) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Could not allocate memory for the block allocation table (%u bytes)", cBatEntries * sizeof(uint32_t)); break; } rc = vdIfIoIntFileReadSync(pIfIo, pStorage, offBat, paBat, cBatEntries * sizeof(uint32_t)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Could not read block allocation table (at %llu), %Rrc", offBat, rc); break; } pu32BlockBitmap = (uint32_t *)RTMemAllocZ(RT_ALIGN_Z(cBatEntries / 8, 4)); if (!pu32BlockBitmap) { rc = vdIfError(pIfError, VERR_NO_MEMORY, RT_SRC_POS, "Failed to allocate memory for block bitmap"); break; } uint32_t idxMinBlock = UINT32_C(0xffffffff); for (uint32_t i = 0; i < cBatEntries; i++) { paBat[i] = RT_BE2H_U32(paBat[i]); if (paBat[i] < idxMinBlock) idxMinBlock = paBat[i]; } vdIfErrorMessage(pIfError, "First data block at sector %u\n", idxMinBlock); for (uint32_t i = 0; i < cBatEntries; i++) { if (paBat[i] != UINT32_C(0xffffffff)) { uint64_t offBlock =(uint64_t)paBat[i] * VHD_SECTOR_SIZE; /* * Check that the offsets are valid (inside of the image) and * that there are no double references. */ if (offBlock + cbBlock > cbFile) { vdIfErrorMessage(pIfError, "Entry %u points to invalid offset %llu, clearing\n", i, offBlock); paBat[i] = UINT32_C(0xffffffff); fRepairBat = true; } else if (offBlock + cbBlock > offFooter) { vdIfErrorMessage(pIfError, "Entry %u intersects with footer, aligning footer\n", i); offFooter = offBlock + cbBlock; fRepairBat = true; } if ( paBat[i] != UINT32_C(0xffffffff) && ASMBitTestAndSet(pu32BlockBitmap, (uint32_t)((paBat[i] - idxMinBlock) / (cbBlock / VHD_SECTOR_SIZE)))) { vdIfErrorMessage(pIfError, "Entry %u points to an already referenced data block, clearing\n", i); paBat[i] = UINT32_C(0xffffffff); fRepairBat = true; } } } } /* Write repaired structures now. */ if (!(fRepairBat || fRepairDynHeader || fRepairFooter)) vdIfErrorMessage(pIfError, "VHD image is in a consistent state, no repair required\n"); else if (!(fFlags & VD_REPAIR_DRY_RUN)) { if (fRepairBat) { for (uint32_t i = 0; i < cBatEntries; i++) paBat[i] = RT_H2BE_U32(paBat[i]); vdIfErrorMessage(pIfError, "Writing repaired block allocation table...\n"); rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offBat, paBat, cBatEntries * sizeof(uint32_t)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Could not write repaired block allocation table (at %llu), %Rrc", offBat, rc); break; } } if (fRepairDynHeader) { Assert(fDynamic); vdIfErrorMessage(pIfError, "Writing repaired dynamic disk header...\n"); rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offDynamicDiskHeader, &dynamicDiskHeader, sizeof(VHDDynamicDiskHeader)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Could not write repaired dynamic disk header (at %llu), %Rrc", offDynamicDiskHeader, rc); break; } } if (fRepairFooter) { vdIfErrorMessage(pIfError, "Writing repaired Footer...\n"); if (fDynamic) { /* Write backup at image beginning. */ rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, 0, &vhdFooter, sizeof(VHDFooter)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Could not write repaired backup footer (at %llu), %Rrc", 0, rc); break; } } rc = vdIfIoIntFileWriteSync(pIfIo, pStorage, offFooter, &vhdFooter, sizeof(VHDFooter)); if (RT_FAILURE(rc)) { rc = vdIfError(pIfError, VERR_VD_IMAGE_REPAIR_IMPOSSIBLE, RT_SRC_POS, "Could not write repaired footer (at %llu), %Rrc", cbFile - sizeof(VHDFooter), rc); break; } } vdIfErrorMessage(pIfError, "Corrupted VHD image repaired successfully\n"); } } while(0); if (paBat) RTMemFree(paBat); if (pu32BlockBitmap) RTMemFree(pu32BlockBitmap); if (pStorage) { int rc2 = vdIfIoIntFileClose(pIfIo, pStorage); if (RT_SUCCESS(rc)) rc = rc2; /* Propagate status code only when repairing the image was successful. */ } LogFlowFunc(("returns %Rrc\n", rc)); return rc; } const VBOXHDDBACKEND g_VhdBackend = { /* pszBackendName */ "VHD", /* cbSize */ sizeof(VBOXHDDBACKEND), /* uBackendCaps */ VD_CAP_UUID | VD_CAP_DIFF | VD_CAP_FILE | VD_CAP_CREATE_FIXED | VD_CAP_CREATE_DYNAMIC | VD_CAP_ASYNC | VD_CAP_VFS, /* paFileExtensions */ s_aVhdFileExtensions, /* paConfigInfo */ NULL, /* pfnCheckIfValid */ vhdCheckIfValid, /* pfnOpen */ vhdOpen, /* pfnCreate */ vhdCreate, /* pfnRename */ vhdRename, /* pfnClose */ vhdClose, /* pfnRead */ vhdRead, /* pfnWrite */ vhdWrite, /* pfnFlush */ vhdFlush, /* pfnDiscard */ NULL, /* pfnGetVersion */ vhdGetVersion, /* pfnGetSectorSize */ vhdGetSectorSize, /* pfnGetSize */ vhdGetSize, /* pfnGetFileSize */ vhdGetFileSize, /* pfnGetPCHSGeometry */ vhdGetPCHSGeometry, /* pfnSetPCHSGeometry */ vhdSetPCHSGeometry, /* pfnGetLCHSGeometry */ vhdGetLCHSGeometry, /* pfnSetLCHSGeometry */ vhdSetLCHSGeometry, /* pfnGetImageFlags */ vhdGetImageFlags, /* pfnGetOpenFlags */ vhdGetOpenFlags, /* pfnSetOpenFlags */ vhdSetOpenFlags, /* pfnGetComment */ vhdGetComment, /* pfnSetComment */ vhdSetComment, /* pfnGetUuid */ vhdGetUuid, /* pfnSetUuid */ vhdSetUuid, /* pfnGetModificationUuid */ vhdGetModificationUuid, /* pfnSetModificationUuid */ vhdSetModificationUuid, /* pfnGetParentUuid */ vhdGetParentUuid, /* pfnSetParentUuid */ vhdSetParentUuid, /* pfnGetParentModificationUuid */ vhdGetParentModificationUuid, /* pfnSetParentModificationUuid */ vhdSetParentModificationUuid, /* pfnDump */ vhdDump, /* pfnGetTimeStamp */ vhdGetTimeStamp, /* pfnGetParentTimeStamp */ vhdGetParentTimeStamp, /* pfnSetParentTimeStamp */ vhdSetParentTimeStamp, /* pfnGetParentFilename */ vhdGetParentFilename, /* pfnSetParentFilename */ vhdSetParentFilename, /* pfnComposeLocation */ genericFileComposeLocation, /* pfnComposeName */ genericFileComposeName, /* pfnCompact */ vhdCompact, /* pfnResize */ vhdResize, /* pfnRepair */ vhdRepair, /* pfnTraverseMetadata */ NULL };