/** @file * VBox HDD Container API. */ /* * Copyright (C) 2006-2023 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from https://www.virtualbox.org. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, in version 3 of the * License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included * in the VirtualBox distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. * * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 */ #ifndef VBOX_INCLUDED_vd_h #define VBOX_INCLUDED_vd_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include #include #include #include #include #include #include #include #include #include RT_C_DECLS_BEGIN #ifdef IN_RING0 # error "There are no VBox HDD Container APIs available in Ring-0 Host Context!" #endif /** @defgroup grp_vd Virtual Disk Container * @{ */ /** Current VMDK image version. */ #define VMDK_IMAGE_VERSION (0x0001) /** Current VDI image major version. */ #define VDI_IMAGE_VERSION_MAJOR (0x0001) /** Current VDI image minor version. */ #define VDI_IMAGE_VERSION_MINOR (0x0001) /** Current VDI image version. */ #define VDI_IMAGE_VERSION ((VDI_IMAGE_VERSION_MAJOR << 16) | VDI_IMAGE_VERSION_MINOR) /** Get VDI major version from combined version. */ #define VDI_GET_VERSION_MAJOR(uVer) ((uVer) >> 16) /** Get VDI minor version from combined version. */ #define VDI_GET_VERSION_MINOR(uVer) ((uVer) & 0xffff) /** Placeholder for specifying the last opened image. */ #define VD_LAST_IMAGE 0xffffffffU /** Placeholder for VDCopyEx to indicate that the image content is unknown. */ #define VD_IMAGE_CONTENT_UNKNOWN 0xffffffffU /** @name VBox HDD container image flags * Same values as MediumVariant API enum. * @{ */ /** No flags. */ #define VD_IMAGE_FLAGS_NONE (0) /** Fixed image. */ #define VD_IMAGE_FLAGS_FIXED (0x10000) /** Diff image. Mutually exclusive with fixed image. */ #define VD_IMAGE_FLAGS_DIFF (0x20000) /** VMDK: Split image into 2GB extents. */ #define VD_VMDK_IMAGE_FLAGS_SPLIT_2G (0x0001) /** VMDK: Raw disk image (giving access to a number of host partitions). */ #define VD_VMDK_IMAGE_FLAGS_RAWDISK (0x0002) /** VMDK: stream optimized image, read only. */ #define VD_VMDK_IMAGE_FLAGS_STREAM_OPTIMIZED (0x0004) /** VMDK: ESX variant, use in addition to other flags. */ #define VD_VMDK_IMAGE_FLAGS_ESX (0x0008) /** VDI: Fill new blocks with zeroes while expanding image file. Only valid * for newly created images, never set for opened existing images. */ #define VD_VDI_IMAGE_FLAGS_ZERO_EXPAND (0x0100) /** Mask of valid image flags for VMDK. */ #define VD_VMDK_IMAGE_FLAGS_MASK ( VD_IMAGE_FLAGS_FIXED | VD_IMAGE_FLAGS_DIFF | VD_IMAGE_FLAGS_NONE \ | VD_VMDK_IMAGE_FLAGS_SPLIT_2G | VD_VMDK_IMAGE_FLAGS_RAWDISK \ | VD_VMDK_IMAGE_FLAGS_STREAM_OPTIMIZED | VD_VMDK_IMAGE_FLAGS_ESX) /** Mask of valid image flags for VDI. */ #define VD_VDI_IMAGE_FLAGS_MASK (VD_IMAGE_FLAGS_FIXED | VD_IMAGE_FLAGS_DIFF | VD_IMAGE_FLAGS_NONE | VD_VDI_IMAGE_FLAGS_ZERO_EXPAND) /** Mask of all valid image flags for all formats. */ #define VD_IMAGE_FLAGS_MASK (VD_VMDK_IMAGE_FLAGS_MASK | VD_VDI_IMAGE_FLAGS_MASK) /** Default image flags. */ #define VD_IMAGE_FLAGS_DEFAULT (VD_IMAGE_FLAGS_NONE) /** @} */ /** @name VD image repair flags * @{ */ /** Don't repair the image but check what needs to be done. */ #define VD_REPAIR_DRY_RUN RT_BIT_32(0) /** Mask of all valid repair flags. */ #define VD_REPAIR_FLAGS_MASK (VD_REPAIR_DRY_RUN) /** @} */ /** @name VD image VFS file flags * @{ */ /** Destroy the VD disk container when the VFS file is released. */ #define VD_VFSFILE_DESTROY_ON_RELEASE RT_BIT_32(0) /** Mask of all valid repair flags. */ #define VD_VFSFILE_FLAGS_MASK (VD_VFSFILE_DESTROY_ON_RELEASE) /** @} */ /** @name VDISKRAW_XXX - VBox raw disk or partition flags * @{ */ /** No special treatment. */ #define VDISKRAW_NORMAL 0 /** Whether this is a raw disk (where the partition information is ignored) or * not. Valid only in the raw disk descriptor. */ #define VDISKRAW_DISK RT_BIT(0) /** Open the corresponding raw disk or partition for reading only, no matter * how the image is created or opened. */ #define VDISKRAW_READONLY RT_BIT(1) /** @} */ /** * Auxiliary type for describing partitions on raw disks. * * The entries must be in ascending order (as far as uStart is concerned), and * must not overlap. Note that this does not correspond 1:1 to partitions, it is * describing the general meaning of contiguous areas on the disk. */ typedef struct VDISKRAWPARTDESC { /** Device to use for this partition/data area. Can be the disk device if * the offset field is set appropriately. If this is NULL, then this * partition will not be accessible to the guest. The size of the data area * must still be set correctly. */ char *pszRawDevice; /** Pointer to the partitioning info. NULL means this is a regular data * area on disk, non-NULL denotes data which should be copied to the * partition data overlay. */ void *pvPartitionData; /** Offset where the data starts in this device. */ uint64_t offStartInDevice; /** Offset where the data starts in the disk. */ uint64_t offStartInVDisk; /** Size of the data area. */ uint64_t cbData; /** Flags for special treatment, see VDISKRAW_XXX. */ uint32_t uFlags; } VDISKRAWPARTDESC, *PVDISKRAWPARTDESC; /** * Auxiliary data structure for difference between GPT and MBR disks. */ typedef enum VDISKPARTTYPE { VDISKPARTTYPE_MBR = 0, VDISKPARTTYPE_GPT } VDISKPARTTYPE; /** * Auxiliary data structure for creating raw disks. */ typedef struct VDISKRAW { /** Signature for structure. Must be 'R', 'A', 'W', '\\0'. Actually a trick * to make logging of the comment string produce sensible results. */ char szSignature[4]; /** Flags for special treatment, see VDISKRAW_XXX. */ uint32_t uFlags; /** Filename for the raw disk. Ignored for partitioned raw disks. * For Linux e.g. /dev/sda, and for Windows e.g. //./PhysicalDisk0. */ char *pszRawDisk; /** Partitioning type of the disk */ VDISKPARTTYPE enmPartitioningType; /** Number of entries in the partition descriptor array. */ uint32_t cPartDescs; /** Pointer to the partition descriptor array. */ PVDISKRAWPARTDESC pPartDescs; } VDISKRAW, *PVDISKRAW; /** @name VBox HDD container image open mode flags * @{ */ /** Try to open image in read/write exclusive access mode if possible, or in read-only elsewhere. */ #define VD_OPEN_FLAGS_NORMAL 0 /** Open image in read-only mode with sharing access with others. */ #define VD_OPEN_FLAGS_READONLY RT_BIT(0) /** Honor zero block writes instead of ignoring them whenever possible. * This is not supported by all formats. It is silently ignored in this case. */ #define VD_OPEN_FLAGS_HONOR_ZEROES RT_BIT(1) /** Honor writes of the same data instead of ignoring whenever possible. * This is handled generically, and is only meaningful for differential image * formats. It is silently ignored otherwise. */ #define VD_OPEN_FLAGS_HONOR_SAME RT_BIT(2) /** Do not perform the base/diff image check on open. This does NOT imply * opening the image as readonly (would break e.g. adding UUIDs to VMDK files * created by other products). Images opened with this flag should only be * used for querying information, and nothing else. */ #define VD_OPEN_FLAGS_INFO RT_BIT(3) /** Open image for asynchronous access. Only available if VD_CAP_ASYNC_IO is * set. VDOpen fails with VERR_NOT_SUPPORTED if this operation is not supported for * this kind of image. */ #define VD_OPEN_FLAGS_ASYNC_IO RT_BIT(4) /** Allow sharing of the image for writable images. May be ignored if the * format backend doesn't support this type of concurrent access. */ #define VD_OPEN_FLAGS_SHAREABLE RT_BIT(5) /** Ask the backend to switch to sequential accesses if possible. Opening * will not fail if it cannot do this, the flag will be simply ignored. */ #define VD_OPEN_FLAGS_SEQUENTIAL RT_BIT(6) /** Allow the discard operation if supported. Only available if VD_CAP_DISCARD * is set. VDOpen fails with VERR_VD_DISCARD_NOT_SUPPORTED if discarding is not * supported. */ #define VD_OPEN_FLAGS_DISCARD RT_BIT(7) /** Ignore all flush requests to workaround certain filesystems which are slow * when writing a lot of cached data to the medium. * Use with extreme care as a host crash can result in completely corrupted and * unusable images. */ #define VD_OPEN_FLAGS_IGNORE_FLUSH RT_BIT(8) /** * Return VINF_VD_NEW_ZEROED_BLOCK for reads from unallocated blocks. * The caller who uses the flag has to make sure that the read doesn't cross * a block boundary. Because the block size can differ between images reading one * sector at a time is the safest solution. */ #define VD_OPEN_FLAGS_INFORM_ABOUT_ZERO_BLOCKS RT_BIT(9) /** * Don't do unnecessary consistency checks when opening the image. * Only valid when the image is opened in readonly because inconsistencies * can lead to corrupted images in read-write mode. */ #define VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS RT_BIT(10) /** Mask of valid flags. */ #define VD_OPEN_FLAGS_MASK (VD_OPEN_FLAGS_NORMAL | VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_HONOR_ZEROES | VD_OPEN_FLAGS_HONOR_SAME | VD_OPEN_FLAGS_INFO | VD_OPEN_FLAGS_ASYNC_IO | VD_OPEN_FLAGS_SHAREABLE | VD_OPEN_FLAGS_SEQUENTIAL | VD_OPEN_FLAGS_DISCARD | VD_OPEN_FLAGS_IGNORE_FLUSH | VD_OPEN_FLAGS_INFORM_ABOUT_ZERO_BLOCKS | VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS) /** @}*/ /** @name VBox HDD container filter flags * @{ */ /** The filter is applied during writes. */ #define VD_FILTER_FLAGS_WRITE RT_BIT(0) /** The filter is applied during reads. */ #define VD_FILTER_FLAGS_READ RT_BIT(1) /** Open the filter in info mode. */ #define VD_FILTER_FLAGS_INFO RT_BIT(2) /** Default set of filter flags. */ #define VD_FILTER_FLAGS_DEFAULT (VD_FILTER_FLAGS_WRITE | VD_FILTER_FLAGS_READ) /** Mask of valid flags. */ #define VD_FILTER_FLAGS_MASK (VD_FILTER_FLAGS_WRITE | VD_FILTER_FLAGS_READ | VD_FILTER_FLAGS_INFO) /** @} */ /** * Helper functions to handle open flags. */ /** * Translate VD_OPEN_FLAGS_* to RTFile open flags. * * @return RTFile open flags. * @param fOpenFlags VD_OPEN_FLAGS_* open flags. * @param fCreate Flag that the file should be created. */ DECLINLINE(uint32_t) VDOpenFlagsToFileOpenFlags(unsigned fOpenFlags, bool fCreate) { uint32_t fOpen; AssertMsg(!(fOpenFlags & VD_OPEN_FLAGS_READONLY) || !fCreate, ("Image can't be opened readonly while being created\n")); if (fOpenFlags & VD_OPEN_FLAGS_READONLY) fOpen = RTFILE_O_READ | RTFILE_O_DENY_NONE; else { fOpen = RTFILE_O_READWRITE; if (fOpenFlags & VD_OPEN_FLAGS_SHAREABLE) fOpen |= RTFILE_O_DENY_NONE; else fOpen |= RTFILE_O_DENY_WRITE; } if (!fCreate) fOpen |= RTFILE_O_OPEN; else fOpen |= RTFILE_O_CREATE | RTFILE_O_NOT_CONTENT_INDEXED; return fOpen; } /** @name VBox HDD container backend capability flags * @{ */ /** Supports UUIDs as expected by VirtualBox code. */ #define VD_CAP_UUID RT_BIT(0) /** Supports creating fixed size images, allocating all space instantly. */ #define VD_CAP_CREATE_FIXED RT_BIT(1) /** Supports creating dynamically growing images, allocating space on demand. */ #define VD_CAP_CREATE_DYNAMIC RT_BIT(2) /** Supports creating images split in chunks of a bit less than 2GBytes. */ #define VD_CAP_CREATE_SPLIT_2G RT_BIT(3) /** Supports being used as differencing image format backend. */ #define VD_CAP_DIFF RT_BIT(4) /** Supports asynchronous I/O operations for at least some configurations. */ #define VD_CAP_ASYNC RT_BIT(5) /** The backend operates on files. The caller needs to know to handle the * location appropriately. */ #define VD_CAP_FILE RT_BIT(6) /** The backend uses the config interface. The caller needs to know how to * provide the mandatory configuration parts this way. */ #define VD_CAP_CONFIG RT_BIT(7) /** The backend uses the network stack interface. The caller has to provide * the appropriate interface. */ #define VD_CAP_TCPNET RT_BIT(8) /** The backend supports VFS (virtual filesystem) functionality since it uses * VDINTERFACEIO exclusively for all file operations. */ #define VD_CAP_VFS RT_BIT(9) /** The backend supports the discard operation. */ #define VD_CAP_DISCARD RT_BIT(10) /** This is a frequently used backend. */ #define VD_CAP_PREFERRED RT_BIT(11) /** @}*/ /** @name Configuration interface key handling flags. * @{ */ /** Mandatory config key. Not providing a value for this key will cause * the backend to fail. */ #define VD_CFGKEY_MANDATORY RT_BIT(0) /** Expert config key. Not showing it by default in the GUI is is probably * a good idea, as the average user won't understand it easily. */ #define VD_CFGKEY_EXPERT RT_BIT(1) /** Key only need at media creation, not to be retained in registry. * Should not be exposed in the GUI */ #define VD_CFGKEY_CREATEONLY RT_BIT(2) /** @}*/ /** * Configuration value type for configuration information interface. */ typedef enum VDCFGVALUETYPE { /** Integer value. */ VDCFGVALUETYPE_INTEGER = 1, /** String value. */ VDCFGVALUETYPE_STRING, /** Bytestring value. */ VDCFGVALUETYPE_BYTES } VDCFGVALUETYPE; /** * Structure describing configuration keys required/supported by a backend * through the config interface. */ typedef struct VDCONFIGINFO { /** Key name of the configuration. */ const char *pszKey; /** Pointer to default value (descriptor). NULL if no useful default value * can be specified. */ const char *pszDefaultValue; /** Value type for this key. */ VDCFGVALUETYPE enmValueType; /** Key handling flags (a combination of VD_CFGKEY_* flags). */ uint64_t uKeyFlags; } VDCONFIGINFO; /** Pointer to structure describing configuration keys. */ typedef VDCONFIGINFO *PVDCONFIGINFO; /** Pointer to const structure describing configuration keys. */ typedef const VDCONFIGINFO *PCVDCONFIGINFO; /** * Structure describing a file extension. */ typedef struct VDFILEEXTENSION { /** Pointer to the NULL-terminated string containing the extension. */ const char *pszExtension; /** The device type the extension supports. */ VDTYPE enmType; } VDFILEEXTENSION; /** Pointer to a structure describing a file extension. */ typedef VDFILEEXTENSION *PVDFILEEXTENSION; /** Pointer to a const structure describing a file extension. */ typedef const VDFILEEXTENSION *PCVDFILEEXTENSION; /** * Data structure for returning a list of backend capabilities. */ typedef struct VDBACKENDINFO { /** Name of the backend. Must be unique even with case insensitive comparison. */ const char *pszBackend; /** Capabilities of the backend (a combination of the VD_CAP_* flags). */ uint64_t uBackendCaps; /** Pointer to a NULL-terminated array of strings, containing the supported * file extensions. Note that some backends do not work on files, so this * pointer may just contain NULL. */ PCVDFILEEXTENSION paFileExtensions; /** Pointer to an array of structs describing each supported config key. * Terminated by a NULL config key. Note that some backends do not support * the configuration interface, so this pointer may just contain NULL. * Mandatory if the backend sets VD_CAP_CONFIG. */ PCVDCONFIGINFO paConfigInfo; /** Returns a human readable hard disk location string given a * set of hard disk configuration keys. The returned string is an * equivalent of the full file path for image-based hard disks. * Mandatory for backends with no VD_CAP_FILE and NULL otherwise. */ DECLR3CALLBACKMEMBER(int, pfnComposeLocation, (PVDINTERFACE pConfig, char **pszLocation)); /** Returns a human readable hard disk name string given a * set of hard disk configuration keys. The returned string is an * equivalent of the file name part in the full file path for * image-based hard disks. Mandatory for backends with no * VD_CAP_FILE and NULL otherwise. */ DECLR3CALLBACKMEMBER(int, pfnComposeName, (PVDINTERFACE pConfig, char **pszName)); } VDBACKENDINFO, *PVDBACKENDINFO; /** * Data structure for returning a list of filter capabilities. */ typedef struct VDFILTERINFO { /** Name of the filter. Must be unique even with case insensitive comparison. */ const char *pszFilter; /** Pointer to an array of structs describing each supported config key. * Terminated by a NULL config key. Note that some filters do not support * the configuration interface, so this pointer may just contain NULL. */ PCVDCONFIGINFO paConfigInfo; } VDFILTERINFO, *PVDFILTERINFO; /** * Request completion callback for the async read/write API. */ typedef DECLCALLBACKTYPE(void, FNVDASYNCTRANSFERCOMPLETE,(void *pvUser1, void *pvUser2, int rcReq)); /** Pointer to a transfer compelte callback. */ typedef FNVDASYNCTRANSFERCOMPLETE *PFNVDASYNCTRANSFERCOMPLETE; /** * VD Container main structure. */ /* Forward declaration, VDISK structure is visible only inside VD module. */ struct VDISK; typedef struct VDISK VDISK; typedef VDISK *PVDISK; /** * Initializes HDD backends. * * @returns VBox status code. */ VBOXDDU_DECL(int) VDInit(void); /** * Destroys loaded HDD backends. * * @returns VBox status code. */ VBOXDDU_DECL(int) VDShutdown(void); /** * Loads a single plugin given by filename. * * @returns VBox status code. * @param pszFilename The plugin filename to load. */ VBOXDDU_DECL(int) VDPluginLoadFromFilename(const char *pszFilename); /** * Load all plugins from a given path. * * @returns VBox statuse code. * @param pszPath The path to load plugins from. */ VBOXDDU_DECL(int) VDPluginLoadFromPath(const char *pszPath); /** * Unloads a single plugin given by filename. * * @returns VBox status code. * @param pszFilename The plugin filename to unload. */ VBOXDDU_DECL(int) VDPluginUnloadFromFilename(const char *pszFilename); /** * Unload all plugins from a given path. * * @returns VBox statuse code. * @param pszPath The path to unload plugins from. */ VBOXDDU_DECL(int) VDPluginUnloadFromPath(const char *pszPath); /** * Lists all HDD backends and their capabilities in a caller-provided buffer. * * @return VBox status code. * VERR_BUFFER_OVERFLOW if not enough space is passed. * @param cEntriesAlloc Number of list entries available. * @param pEntries Pointer to array for the entries. * @param pcEntriesUsed Number of entries returned. */ VBOXDDU_DECL(int) VDBackendInfo(unsigned cEntriesAlloc, PVDBACKENDINFO pEntries, unsigned *pcEntriesUsed); /** * Lists the capabilities of a backend identified by its name. * * @return VBox status code. * @param pszBackend The backend name (case insensitive). * @param pEntry Pointer to an entry. */ VBOXDDU_DECL(int) VDBackendInfoOne(const char *pszBackend, PVDBACKENDINFO pEntry); /** * Lists all filters and their capabilities in a caller-provided buffer. * * @return VBox status code. * VERR_BUFFER_OVERFLOW if not enough space is passed. * @param cEntriesAlloc Number of list entries available. * @param pEntries Pointer to array for the entries. * @param pcEntriesUsed Number of entries returned. */ VBOXDDU_DECL(int) VDFilterInfo(unsigned cEntriesAlloc, PVDFILTERINFO pEntries, unsigned *pcEntriesUsed); /** * Lists the capabilities of a filter identified by its name. * * @return VBox status code. * @param pszFilter The filter name (case insensitive). * @param pEntry Pointer to an entry. */ VBOXDDU_DECL(int) VDFilterInfoOne(const char *pszFilter, PVDFILTERINFO pEntry); /** * Allocates and initializes an empty HDD container. * No image files are opened. * * @return VBox status code. * @param pVDIfsDisk Pointer to the per-disk VD interface list. * @param enmType Type of the image container. * @param ppDisk Where to store the reference to HDD container. */ VBOXDDU_DECL(int) VDCreate(PVDINTERFACE pVDIfsDisk, VDTYPE enmType, PVDISK *ppDisk); /** * Destroys HDD container. * If container has opened image files they will be closed. * * @return VBox status code. * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(int) VDDestroy(PVDISK pDisk); /** * Try to get the backend name which can use this image. * * @return VBox status code. * VINF_SUCCESS if a plugin was found. * ppszFormat contains the string which can be used as backend name. * VERR_NOT_SUPPORTED if no backend was found. * @param pVDIfsDisk Pointer to the per-disk VD interface list. * @param pVDIfsImage Pointer to the per-image VD interface list. * @param pszFilename Name of the image file for which the backend is queried. * @param enmDesiredType The desired image type, VDTYPE_INVALID if anything goes. * @param ppszFormat Receives pointer of the UTF-8 string which contains the format name. * The returned pointer must be freed using RTStrFree(). * @param penmType Where to store the type of the image. */ VBOXDDU_DECL(int) VDGetFormat(PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, const char *pszFilename, VDTYPE enmDesiredType, char **ppszFormat, VDTYPE *penmType); /** * Opens an image file. * * The first opened image file in HDD container must have a base image type, * others (next opened images) must be differencing or undo images. * Linkage is checked for differencing image to be consistent with the previously opened image. * When another differencing image is opened and the last image was opened in read/write access * mode, then the last image is reopened in read-only with deny write sharing mode. This allows * other processes to use images in read-only mode too. * * Note that the image is opened in read-only mode if a read/write open is not possible. * Use VDIsReadOnly to check open mode. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param pszBackend Name of the image file backend to use (case insensitive). * @param pszFilename Name of the image file to open. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * @param pVDIfsImage Pointer to the per-image VD interface list. */ VBOXDDU_DECL(int) VDOpen(PVDISK pDisk, const char *pszBackend, const char *pszFilename, unsigned uOpenFlags, PVDINTERFACE pVDIfsImage); /** * Opens a cache image. * * @return VBox status code. * @param pDisk Pointer to the HDD container which should use the cache image. * @param pszBackend Name of the cache file backend to use (case insensitive). * @param pszFilename Name of the cache image to open. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * @param pVDIfsCache Pointer to the per-cache VD interface list. */ VBOXDDU_DECL(int) VDCacheOpen(PVDISK pDisk, const char *pszBackend, const char *pszFilename, unsigned uOpenFlags, PVDINTERFACE pVDIfsCache); /** * Adds a filter to the disk. * * @returns VBox status code. * @param pDisk Pointer to the HDD container which should use the filter. * @param pszFilter Name of the filter backend to use (case insensitive). * @param fFlags Flags which apply to the filter, combination of VD_FILTER_FLAGS_* * defines. * @param pVDIfsFilter Pointer to the per-filter VD interface list. */ VBOXDDU_DECL(int) VDFilterAdd(PVDISK pDisk, const char *pszFilter, uint32_t fFlags, PVDINTERFACE pVDIfsFilter); /** * Creates and opens a new base image file. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param pszBackend Name of the image file backend to use (case insensitive). * @param pszFilename Name of the image file to create. * @param cbSize Image size in bytes. * @param uImageFlags Flags specifying special image features. * @param pszComment Pointer to image comment. NULL is ok. * @param pPCHSGeometry Pointer to physical disk geometry <= (16383,16,63). Not NULL. * @param pLCHSGeometry Pointer to logical disk geometry <= (x,255,63). Not NULL. * @param pUuid New UUID of the image. If NULL, a new UUID is created. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * @param pVDIfsImage Pointer to the per-image VD interface list. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDCreateBase(PVDISK pDisk, const char *pszBackend, const char *pszFilename, uint64_t cbSize, unsigned uImageFlags, const char *pszComment, PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry, PCRTUUID pUuid, unsigned uOpenFlags, PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation); /** * Creates and opens a new differencing image file in HDD container. * See comments for VDOpen function about differencing images. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param pszBackend Name of the image file backend to use (case insensitive). * @param pszFilename Name of the differencing image file to create. * @param uImageFlags Flags specifying special image features. * @param pszComment Pointer to image comment. NULL is ok. * @param pUuid New UUID of the image. If NULL, a new UUID is created. * @param pParentUuid New parent UUID of the image. If NULL, the UUID is queried automatically. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * @param pVDIfsImage Pointer to the per-image VD interface list. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDCreateDiff(PVDISK pDisk, const char *pszBackend, const char *pszFilename, unsigned uImageFlags, const char *pszComment, PCRTUUID pUuid, PCRTUUID pParentUuid, unsigned uOpenFlags, PVDINTERFACE pVDIfsImage, PVDINTERFACE pVDIfsOperation); /** * Creates and opens new cache image file in HDD container. * * @return VBox status code. * @param pDisk Name of the cache file backend to use (case insensitive). * @param pszBackend Name of the image file backend to use (case insensitive). * @param pszFilename Name of the differencing cache file to create. * @param cbSize Maximum size of the cache. * @param uImageFlags Flags specifying special cache features. * @param pszComment Pointer to image comment. NULL is ok. * @param pUuid New UUID of the image. If NULL, a new UUID is created. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * @param pVDIfsCache Pointer to the per-cache VD interface list. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDCreateCache(PVDISK pDisk, const char *pszBackend, const char *pszFilename, uint64_t cbSize, unsigned uImageFlags, const char *pszComment, PCRTUUID pUuid, unsigned uOpenFlags, PVDINTERFACE pVDIfsCache, PVDINTERFACE pVDIfsOperation); /** * Merges two images (not necessarily with direct parent/child relationship). * As a side effect the source image and potentially the other images which * are also merged to the destination are deleted from both the disk and the * images in the HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImageFrom Image number to merge from, counts from 0. 0 is always base image of container. * @param nImageTo Image number to merge to, counts from 0. 0 is always base image of container. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDMerge(PVDISK pDisk, unsigned nImageFrom, unsigned nImageTo, PVDINTERFACE pVDIfsOperation); /** * Copies an image from one HDD container to another - extended version. * * The copy is opened in the target HDD container. It is possible to convert * between different image formats, because the backend for the destination may * be different from the source. If both the source and destination reference * the same HDD container, then the image is moved (by copying/deleting or * renaming) to the new location. The source container is unchanged if the move * operation fails, otherwise the image at the new location is opened in the * same way as the old one was. * * @note The read/write accesses across disks are not synchronized, just the * accesses to each disk. Once there is a use case which requires a defined * read/write behavior in this situation this needs to be extended. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * * @param pDiskFrom Pointer to source HDD container. * @param nImageFrom Image number to copy from, counts from 0. 0 is always base image of container. * @param pDiskTo Pointer to destination HDD container. * @param nImageTo Image number to copy to, counts from 0. 0 is always base image of container. * @param pszBackend Name of the image file backend to use (may be NULL * to use the same as the source, case insensitive). * @param pszFilename New name of the image (may be NULL to specify that * the copy destination is the destination container, * or if pDiskFrom == pDiskTo, i.e. when moving). * @param fMoveByRename If true, attempt to perform a move by renaming (if * successful the new size is ignored). * @param cbSize New image size (0 means leave unchanged). * @param nImageFromSame The number of the last image in the source chain * having the same content as the image in the * destination chain given by nImageToSame or * VD_IMAGE_CONTENT_UNKNOWN to indicate that the * content of both containers is unknown. See the * notes for further information. * @param nImageToSame The number of the last image in the destination * chain having the same content as the image in the * source chain given by nImageFromSame or * VD_IMAGE_CONTENT_UNKNOWN to indicate that the * content of both containers is unknown. See the notes * for further information. * @param uImageFlags Flags specifying special destination image features. * @param pDstUuid New UUID of the destination image. If NULL, a new * UUID is created. This parameter is used if and only * if a true copy is created. In all rename/move cases * or copy to existing image cases the modification * UUIDs are copied over. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * Only used if the destination image is created. * @param pVDIfsOperation Pointer to the per-operation VD interface list. * @param pDstVDIfsImage Pointer to the per-image VD interface list, for the * destination image. * @param pDstVDIfsOperation Pointer to the per-operation VD interface list, * for the destination operation. * * @note Using nImageFromSame and nImageToSame can lead to a significant speedup * when copying an image but can also lead to a corrupted copy if used * incorrectly. It is mainly useful when cloning a chain of images and it * is known that the virtual disk content of the two chains is exactly the * same upto a certain image. Example: * Imagine the chain of images which consist of a base and one diff * image. Copying the chain starts with the base image. When copying * the first diff image VDCopy() will read the data from the diff of * the source chain and probably from the base image again in case the * diff doesn't has data for the block. However the block will be * optimized away because VDCopy() reads data from the base image of * the destination chain compares the to and suppresses the write * because the data is unchanged. For a lot of diff images this will be * a huge waste of I/O bandwidth if the diff images contain only few * changes. Because it is known that the base image of the source and * the destination chain have the same content it is enough to check * the diff image for changed data and copy it to the destination diff * image which is achieved with nImageFromSame and nImageToSame. * Setting both to 0 can suppress a lot of I/O. */ VBOXDDU_DECL(int) VDCopyEx(PVDISK pDiskFrom, unsigned nImageFrom, PVDISK pDiskTo, unsigned nImageTo, const char *pszBackend, const char *pszFilename, bool fMoveByRename, uint64_t cbSize, unsigned nImageFromSame, unsigned nImageToSame, unsigned uImageFlags, PCRTUUID pDstUuid, unsigned uOpenFlags, PVDINTERFACE pVDIfsOperation, PVDINTERFACE pDstVDIfsImage, PVDINTERFACE pDstVDIfsOperation); /** * Copies an image from one HDD container to another. * The copy is opened in the target HDD container. * It is possible to convert between different image formats, because the * backend for the destination may be different from the source. * If both the source and destination reference the same HDD container, * then the image is moved (by copying/deleting or renaming) to the new location. * The source container is unchanged if the move operation fails, otherwise * the image at the new location is opened in the same way as the old one was. * * @note The read/write accesses across disks are not synchronized, just the * accesses to each disk. Once there is a use case which requires a defined * read/write behavior in this situation this needs to be extended. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDiskFrom Pointer to source HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pDiskTo Pointer to destination HDD container. * @param pszBackend Name of the image file backend to use (may be NULL to use the same as the source, case insensitive). * @param pszFilename New name of the image (may be NULL to specify that the * copy destination is the destination container, or * if pDiskFrom == pDiskTo, i.e. when moving). * @param fMoveByRename If true, attempt to perform a move by renaming (if successful the new size is ignored). * @param cbSize New image size (0 means leave unchanged). * @param uImageFlags Flags specifying special destination image features. * @param pDstUuid New UUID of the destination image. If NULL, a new UUID is created. * This parameter is used if and only if a true copy is created. * In all rename/move cases or copy to existing image cases the modification UUIDs are copied over. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. * Only used if the destination image is created. * @param pVDIfsOperation Pointer to the per-operation VD interface list. * @param pDstVDIfsImage Pointer to the per-image VD interface list, for the * destination image. * @param pDstVDIfsOperation Pointer to the per-operation VD interface list, * for the destination operation. */ VBOXDDU_DECL(int) VDCopy(PVDISK pDiskFrom, unsigned nImage, PVDISK pDiskTo, const char *pszBackend, const char *pszFilename, bool fMoveByRename, uint64_t cbSize, unsigned uImageFlags, PCRTUUID pDstUuid, unsigned uOpenFlags, PVDINTERFACE pVDIfsOperation, PVDINTERFACE pDstVDIfsImage, PVDINTERFACE pDstVDIfsOperation); /** * Optimizes the storage consumption of an image. Typically the unused blocks * have to be wiped with zeroes to achieve a substantial reduced storage use. * Another optimization done is reordering the image blocks, which can provide * a significant performance boost, as reads and writes tend to use less random * file offsets. * * @note Compaction is treated as a single operation with regard to thread * synchronization, which means that it potentially blocks other activities for * a long time. The complexity of compaction would grow even more if concurrent * accesses have to be handled. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @return VERR_VD_IMAGE_READ_ONLY if image is not writable. * @return VERR_NOT_SUPPORTED if this kind of image can be compacted, but * this isn't supported yet. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDCompact(PVDISK pDisk, unsigned nImage, PVDINTERFACE pVDIfsOperation); /** * Resizes the given disk image to the given size. It is OK if there are * multiple images open in the container. In this case the last disk image * will be resized. * * @return VBox status * @return VERR_VD_IMAGE_READ_ONLY if image is not writable. * @return VERR_NOT_SUPPORTED if this kind of image can't be compacted. * * @param pDisk Pointer to the HDD container. * @param cbSize New size of the image. * @param pPCHSGeometry Pointer to the new physical disk geometry <= (16383,16,63). Not NULL. * @param pLCHSGeometry Pointer to the new logical disk geometry <= (x,255,63). Not NULL. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDResize(PVDISK pDisk, uint64_t cbSize, PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry, PVDINTERFACE pVDIfsOperation); /** * Prepares the given disk for use by the added filters. This applies to all * opened images in the chain which might be opened read/write temporary. * * @return VBox status code. * * @param pDisk Pointer to the HDD container. * @param pVDIfsOperation Pointer to the per-operation VD interface list. */ VBOXDDU_DECL(int) VDPrepareWithFilters(PVDISK pDisk, PVDINTERFACE pVDIfsOperation); /** * Closes the last opened image file in HDD container. * If previous image file was opened in read-only mode (the normal case) and * the last opened image is in read-write mode then the previous image will be * reopened in read/write mode. * * @return VBox status code. * @return VERR_VD_NOT_OPENED if no image is opened in HDD container. * @param pDisk Pointer to HDD container. * @param fDelete If true, delete the image from the host disk. */ VBOXDDU_DECL(int) VDClose(PVDISK pDisk, bool fDelete); /** * Removes the last added filter in the HDD container from the specified chain. * * @return VBox status code. * @retval VERR_VD_NOT_OPENED if no filter is present for the disk. * @param pDisk Pointer to HDD container. * @param fFlags Combination of VD_FILTER_FLAGS_* defines. */ VBOXDDU_DECL(int) VDFilterRemove(PVDISK pDisk, uint32_t fFlags); /** * Closes the currently opened cache image file in HDD container. * * @return VBox status code. * @return VERR_VD_NOT_OPENED if no cache is opened in HDD container. * @param pDisk Pointer to HDD container. * @param fDelete If true, delete the image from the host disk. */ VBOXDDU_DECL(int) VDCacheClose(PVDISK pDisk, bool fDelete); /** * Closes all opened image files in HDD container. * * @return VBox status code. * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(int) VDCloseAll(PVDISK pDisk); /** * Removes all filters of the given HDD container. * * @return VBox status code. * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(int) VDFilterRemoveAll(PVDISK pDisk); /** * Read data from virtual HDD. * * @return VBox status code. * @retval VERR_VD_NOT_OPENED if no image is opened in HDD container. * @param pDisk Pointer to HDD container. * @param uOffset Offset of first reading byte from start of disk. * Must be aligned to a sector boundary. * @param pvBuf Pointer to buffer for reading data. * @param cbRead Number of bytes to read. * Must be aligned to a sector boundary. */ VBOXDDU_DECL(int) VDRead(PVDISK pDisk, uint64_t uOffset, void *pvBuf, size_t cbRead); /** * Write data to virtual HDD. * * @return VBox status code. * @retval VERR_VD_NOT_OPENED if no image is opened in HDD container. * @param pDisk Pointer to HDD container. * @param uOffset Offset of first writing byte from start of disk. * Must be aligned to a sector boundary. * @param pvBuf Pointer to buffer for writing data. * @param cbWrite Number of bytes to write. * Must be aligned to a sector boundary. */ VBOXDDU_DECL(int) VDWrite(PVDISK pDisk, uint64_t uOffset, const void *pvBuf, size_t cbWrite); /** * Make sure the on disk representation of a virtual HDD is up to date. * * @return VBox status code. * @retval VERR_VD_NOT_OPENED if no image is opened in HDD container. * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(int) VDFlush(PVDISK pDisk); /** * Get number of opened images in HDD container. * * @return Number of opened images for HDD container. 0 if no images have been opened. * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(unsigned) VDGetCount(PVDISK pDisk); /** * Get read/write mode of HDD container. * * @return Virtual disk ReadOnly status. * @return true if no image is opened in HDD container. * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(bool) VDIsReadOnly(PVDISK pDisk); /** * Get sector size of an image in HDD container. * * @return Virtual disk sector size in bytes. * @return 0 if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. */ VBOXDDU_DECL(uint32_t) VDGetSectorSize(PVDISK pDisk, unsigned nImage); /** * Get total capacity of an image in HDD container. * * @return Virtual disk size in bytes. * @return 0 if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. */ VBOXDDU_DECL(uint64_t) VDGetSize(PVDISK pDisk, unsigned nImage); /** * Get total file size of an image in HDD container. * * @return Virtual disk size in bytes. * @return 0 if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. */ VBOXDDU_DECL(uint64_t) VDGetFileSize(PVDISK pDisk, unsigned nImage); /** * Get virtual disk PCHS geometry of an image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @return VERR_VD_GEOMETRY_NOT_SET if no geometry present in the HDD container. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pPCHSGeometry Where to store PCHS geometry. Not NULL. */ VBOXDDU_DECL(int) VDGetPCHSGeometry(PVDISK pDisk, unsigned nImage, PVDGEOMETRY pPCHSGeometry); /** * Store virtual disk PCHS geometry of an image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pPCHSGeometry Where to load PCHS geometry from. Not NULL. */ VBOXDDU_DECL(int) VDSetPCHSGeometry(PVDISK pDisk, unsigned nImage, PCVDGEOMETRY pPCHSGeometry); /** * Get virtual disk LCHS geometry of an image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @return VERR_VD_GEOMETRY_NOT_SET if no geometry present in the HDD container. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pLCHSGeometry Where to store LCHS geometry. Not NULL. */ VBOXDDU_DECL(int) VDGetLCHSGeometry(PVDISK pDisk, unsigned nImage, PVDGEOMETRY pLCHSGeometry); /** * Store virtual disk LCHS geometry of an image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pLCHSGeometry Where to load LCHS geometry from. Not NULL. */ VBOXDDU_DECL(int) VDSetLCHSGeometry(PVDISK pDisk, unsigned nImage, PCVDGEOMETRY pLCHSGeometry); /** * Queries the available regions of an image in the given VD container. * * @return VBox status code. * @retval VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @retval VERR_NOT_SUPPORTED if the image backend doesn't support region lists. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param fFlags Combination of VD_REGION_LIST_F_* flags. * @param ppRegionList Where to store the pointer to the region list on success, must be freed * with VDRegionListFree(). */ VBOXDDU_DECL(int) VDQueryRegions(PVDISK pDisk, unsigned nImage, uint32_t fFlags, PPVDREGIONLIST ppRegionList); /** * Frees a region list previously queried with VDQueryRegions(). * * @param pRegionList The region list to free. */ VBOXDDU_DECL(void) VDRegionListFree(PVDREGIONLIST pRegionList); /** * Get version of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param puVersion Where to store the image version. */ VBOXDDU_DECL(int) VDGetVersion(PVDISK pDisk, unsigned nImage, unsigned *puVersion); /** * List the capabilities of image backend in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to the HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pBackendInfo Where to store the backend information. */ VBOXDDU_DECL(int) VDBackendInfoSingle(PVDISK pDisk, unsigned nImage, PVDBACKENDINFO pBackendInfo); /** * Get flags of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param puImageFlags Where to store the image flags. */ VBOXDDU_DECL(int) VDGetImageFlags(PVDISK pDisk, unsigned nImage, unsigned *puImageFlags); /** * Get open flags of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param puOpenFlags Where to store the image open flags. */ VBOXDDU_DECL(int) VDGetOpenFlags(PVDISK pDisk, unsigned nImage, unsigned *puOpenFlags); /** * Set open flags of image in HDD container. * This operation may cause file locking changes and/or files being reopened. * Note that in case of unrecoverable error all images in HDD container will be closed. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. */ VBOXDDU_DECL(int) VDSetOpenFlags(PVDISK pDisk, unsigned nImage, unsigned uOpenFlags); /** * Get base filename of image in HDD container. Some image formats use * other filenames as well, so don't use this for anything but informational * purposes. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @return VERR_BUFFER_OVERFLOW if pszFilename buffer too small to hold filename. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pszFilename Where to store the image file name. * @param cbFilename Size of buffer pszFilename points to. */ VBOXDDU_DECL(int) VDGetFilename(PVDISK pDisk, unsigned nImage, char *pszFilename, unsigned cbFilename); /** * Get the comment line of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @return VERR_BUFFER_OVERFLOW if pszComment buffer too small to hold comment text. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pszComment Where to store the comment string of image. NULL is ok. * @param cbComment The size of pszComment buffer. 0 is ok. */ VBOXDDU_DECL(int) VDGetComment(PVDISK pDisk, unsigned nImage, char *pszComment, unsigned cbComment); /** * Changes the comment line of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pszComment New comment string (UTF-8). NULL is allowed to reset the comment. */ VBOXDDU_DECL(int) VDSetComment(PVDISK pDisk, unsigned nImage, const char *pszComment); /** * Get UUID of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pUuid Where to store the image UUID. */ VBOXDDU_DECL(int) VDGetUuid(PVDISK pDisk, unsigned nImage, PRTUUID pUuid); /** * Set the image's UUID. Should not be used by normal applications. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pUuid New UUID of the image. If NULL, a new UUID is created. */ VBOXDDU_DECL(int) VDSetUuid(PVDISK pDisk, unsigned nImage, PCRTUUID pUuid); /** * Get last modification UUID of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pUuid Where to store the image modification UUID. */ VBOXDDU_DECL(int) VDGetModificationUuid(PVDISK pDisk, unsigned nImage, PRTUUID pUuid); /** * Set the image's last modification UUID. Should not be used by normal applications. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pUuid New modification UUID of the image. If NULL, a new UUID is created. */ VBOXDDU_DECL(int) VDSetModificationUuid(PVDISK pDisk, unsigned nImage, PCRTUUID pUuid); /** * Get parent UUID of image in HDD container. * * @return VBox status code. * @return VERR_VD_IMAGE_NOT_FOUND if image with specified number was not opened. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of the container. * @param pUuid Where to store the parent image UUID. */ VBOXDDU_DECL(int) VDGetParentUuid(PVDISK pDisk, unsigned nImage, PRTUUID pUuid); /** * Set the image's parent UUID. Should not be used by normal applications. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param nImage Image number, counts from 0. 0 is always base image of container. * @param pUuid New parent UUID of the image. If NULL, a new UUID is created. */ VBOXDDU_DECL(int) VDSetParentUuid(PVDISK pDisk, unsigned nImage, PCRTUUID pUuid); /** * Debug helper - dumps all opened images in HDD container into the log file. * * @param pDisk Pointer to HDD container. */ VBOXDDU_DECL(void) VDDumpImages(PVDISK pDisk); /** * Discards unused ranges given as a list. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param paRanges The array of ranges to discard. * @param cRanges Number of entries in the array. * * @note In contrast to VDCompact() the ranges are always discarded even if they * appear to contain data. This method is mainly used to implement TRIM support. */ VBOXDDU_DECL(int) VDDiscardRanges(PVDISK pDisk, PCRTRANGE paRanges, unsigned cRanges); /** * Start an asynchronous read request. * * @return VBox status code. * @param pDisk Pointer to the HDD container. * @param off The offset of the virtual disk to read from. * @param cbRead How many bytes to read. * @param pSgBuf Pointer to the S/G buffer to read into. * @param pfnComplete Completion callback. * @param pvUser1 User data which is passed on completion. * @param pvUser2 User data which is passed on completion. */ VBOXDDU_DECL(int) VDAsyncRead(PVDISK pDisk, uint64_t off, size_t cbRead, PCRTSGBUF pSgBuf, PFNVDASYNCTRANSFERCOMPLETE pfnComplete, void *pvUser1, void *pvUser2); /** * Start an asynchronous write request. * * @return VBox status code. * @param pDisk Pointer to the HDD container. * @param off The offset of the virtual disk to write to. * @param cbWrite How many bytes to write. * @param pSgBuf Pointer to the S/G buffer to write from. * @param pfnComplete Completion callback. * @param pvUser1 User data which is passed on completion. * @param pvUser2 User data which is passed on completion. */ VBOXDDU_DECL(int) VDAsyncWrite(PVDISK pDisk, uint64_t off, size_t cbWrite, PCRTSGBUF pSgBuf, PFNVDASYNCTRANSFERCOMPLETE pfnComplete, void *pvUser1, void *pvUser2); /** * Start an asynchronous flush request. * * @return VBox status code. * @param pDisk Pointer to the HDD container. * @param pfnComplete Completion callback. * @param pvUser1 User data which is passed on completion. * @param pvUser2 User data which is passed on completion. */ VBOXDDU_DECL(int) VDAsyncFlush(PVDISK pDisk, PFNVDASYNCTRANSFERCOMPLETE pfnComplete, void *pvUser1, void *pvUser2); /** * Start an asynchronous discard request. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param paRanges The array of ranges to discard. * @param cRanges Number of entries in the array. * @param pfnComplete Completion callback. * @param pvUser1 User data which is passed on completion. * @param pvUser2 User data which is passed on completion. */ VBOXDDU_DECL(int) VDAsyncDiscardRanges(PVDISK pDisk, PCRTRANGE paRanges, unsigned cRanges, PFNVDASYNCTRANSFERCOMPLETE pfnComplete, void *pvUser1, void *pvUser2); /** * Tries to repair a corrupted image. * * @return VBox status code. * @retval VERR_VD_IMAGE_REPAIR_NOT_SUPPORTED if the backend does not support repairing the image. * @retval VERR_VD_IMAGE_REPAIR_IMPOSSIBLE if the corruption is to severe to repair the image. * @param pVDIfsDisk Pointer to the per-disk VD interface list. * @param pVDIfsImage Pointer to the per-image VD interface list. * @param pszFilename Name of the image file to repair. * @param pszBackend The backend to use. * @param fFlags Combination of the VD_REPAIR_* flags. */ VBOXDDU_DECL(int) VDRepair(PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, const char *pszFilename, const char *pszBackend, uint32_t fFlags); /** * Create a VFS file handle from the given HDD container. * * @return VBox status code. * @param pDisk Pointer to HDD container. * @param fFlags Combination of the VD_VFSFILE_* flags. * @param phVfsFile Where to store the handle to the VFS file on * success. */ VBOXDDU_DECL(int) VDCreateVfsFileFromDisk(PVDISK pDisk, uint32_t fFlags, PRTVFSFILE phVfsFile); /** @defgroup grp_vd_ifs_def Default implementations for certain VD interfaces. * @{ */ /** Internal per interface instance data. */ typedef struct VDIFINSTINT *VDIFINST; /** Pointer to the per instance interface data. */ typedef VDIFINST *PVDIFINST; /** * Creates a new VD TCP/IP interface instance and adds it to the given interface list. * * @returns VBox status code. * @param phTcpNetInst Where to store the TCP/IP interface handle on success. * @param ppVdIfs Pointer to the VD interface list. */ VBOXDDU_DECL(int) VDIfTcpNetInstDefaultCreate(PVDIFINST phTcpNetInst, PVDINTERFACE *ppVdIfs); /** * Destroys the given VD TCP/IP interface instance. * * @param hTcpNetInst The TCP/IP interface instance handle. */ VBOXDDU_DECL(void) VDIfTcpNetInstDefaultDestroy(VDIFINST hTcpNetInst); /** @} */ /** @defgroup grp_vd_ioiter I/O iterator * @{ */ /** Read metadata coming before each main data block addressed in the segment. */ #define VD_IOITER_SEG_F_PRE_METADATA RT_BIT_32(0) /** Read the main user data of each addressed block in the segment. */ #define VD_IOITER_SEG_F_MAIN_DATA RT_BIT_32(1) /** Read metadata coming after each main data block addressed in the segment. */ #define VD_IOITER_SEG_F_POST_METADATA RT_BIT_32(2) /** Read checksum data of each data block addressed in the segment. */ #define VD_IOITER_SEG_F_CHKSUM RT_BIT_32(3) /** Read all available data for each addressed block in the segment. */ #define VD_IOITER_SEG_F_AVAILABLE RT_BIT_32(4) /** The offset and size members in the segments use byte granularity instead of a * block address and number of blocks respectively. */ #define VDIOITER_F_BYTE_OFFSET_AND_SIZE RT_BIT_32(0) /** * VD I/O iterator segment. */ typedef struct VDIOITERSEG { /** Start offset for this segment. */ uint64_t offStartSeg; /** Size of the segment (bytes or blocks). */ uint64_t cSizeSeg; /** Flags for this segment, see VD_IOITER_SEG_F_*. */ uint32_t fFlags; } VDIOITERSEG; /** Pointer to a I/O iterator segment. */ typedef VDIOITERSEG *PVDIOITERSEG; /** Pointer to a constant I/O iterator segment. */ typedef VDIOITERSEG *PCVDIOITERSEG; /** I/O iterator handle. */ typedef struct VDIOITERINT *VDIOITER; /** Pointer to a I/O iterator handle. */ typedef VDIOITER *PVDIOITER; /** * Create a new I/O iterator. * * @returns VBox status code. * @param pDisk The disk to create the iterator for. * @param phVdIoIter Where to store the handle to the I/O iterator on success. * @param paIoIterSegs The segments for the iterator, can be destroyed after the call. * @param cIoIterSegs Number of segments. * @param fFlags Flags for the iterator, see VDIOITER_F_* */ VBOXDDU_DECL(int) VDIoIterCreate(PVDISK pDisk, PVDIOITER phVdIoIter, PCVDIOITERSEG paIoIterSegs, uint32_t cIoIterSegs, uint32_t fFlags); /** * Retains the reference count of the given I/O iterator. * * @returns New reference count. * @param hVdIoIter The I/O iterator handle. */ VBOXDDU_DECL(uint32_t) VDIoIterRetain(VDIOITER hVdIoIter); /** * Releases the reference count of the given I/O iterator. * * @returns New reference count, on 0 the iterator is destroyed. * @param hVdIoIter The I/O iterator handle. */ VBOXDDU_DECL(uint32_t) VDIoIterRelease(VDIOITER hVdIoIter); /** * Returns the number of segments in the given I/O iterator. * * @returns Number of segments. * @param hVdIoIter The I/O iterator handle. */ VBOXDDU_DECL(uint32_t) VDIoIterGetSegmentCount(VDIOITER hVdIoIter); /** * Returns the flags of the given I/O iterator. * * @returns Flags. * @param hVdIoIter The I/O iterator handle. */ VBOXDDU_DECL(uint32_t) VDIoIterGetFlags(VDIOITER hVdIoIter); /** * Queries the properties of the given segment for the given I/O iterator. * * @returns VBox status code. * @param hVdIoIter The I/O iterator handle. * @param idx The segment index to query. * @param pSegment Where to store the segment properties on success. */ VBOXDDU_DECL(int) VDIoIterQuerySegment(VDIOITER hVdIoIter, uint32_t idx, PVDIOITERSEG pSegment); /** @} */ /** @defgroup grp_vd_io_buf I/O buffer management API. * @{ */ /** VD I/O buffer manager handle. */ typedef struct VDIOBUFMGRINT *VDIOBUFMGR; /** Pointer to VD I/O buffer manager handle. */ typedef VDIOBUFMGR *PVDIOBUFMGR; /** VD I/O buffer handle. */ typedef struct VDIOBUFINT *VDIOBUF; /** Pointer to a VD I/O buffer handle. */ typedef VDIOBUF *PVDIOBUF; /** Default I/O buffer manager flags. */ #define VD_IOBUFMGR_F_DEFAULT (0) /** I/O buffer memory needs to be non pageable (for example because it contains sensitive data * which shouldn't end up in swap unencrypted). */ #define VD_IOBUFMGR_F_REQUIRE_NOT_PAGABLE RT_BIT(0) /** Pointer to VD I/O buffer callbacks. */ typedef struct VDIOBUFCALLBACKS *PVDIOBUFCALLBACKS; /** Pointer to const VD I/O buffer callbacks. */ typedef const struct VDIOBUFCALLBACKS *PCVDIOBUFCALLBACKS; /** * VD I/O buffer callbacks. */ typedef struct VDIOBUFCALLBACKS { /** * Copy data from the memory buffer of the caller to the callees memory buffer for the given request. * * @returns VBox status code. * @retval VERR_PDM_MEDIAEX_IOBUF_OVERFLOW if there is not enough room to store the data. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param hIoBuf The I/O request handle. * @param pvIoBufAlloc The allocator specific memory for this request. * @param offDst The destination offset from the start to write the data to. * @param pSgBuf The S/G buffer to read the data from. * @param cbCopy How many bytes to copy. */ DECLR3CALLBACKMEMBER(int, pfnIoBufCopyFromBuf, (PVDIOBUFCALLBACKS pInterface, VDIOBUF hIoBuf, void *pvIoBufAlloc, uint32_t offDst, PRTSGBUF pSgBuf, size_t cbCopy)); /** * Copy data to the memory buffer of the caller from the callees memory buffer for the given request. * * @returns VBox status code. * @retval VERR_PDM_MEDIAEX_IOBUF_UNDERRUN if there is not enough data to copy from the buffer. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param hIoBuf The I/O request handle. * @param pvIoBufAlloc The allocator specific memory for this request. * @param offSrc The offset from the start of the buffer to read the data from. * @param pSgBuf The S/G buffer to write the data to. * @param cbCopy How many bytes to copy. */ DECLR3CALLBACKMEMBER(int, pfnIoBufCopyToBuf, (PVDIOBUFCALLBACKS pInterface, VDIOBUF hIoBuf, void *pvIoBufAlloc, uint32_t offSrc, PRTSGBUF pSgBuf, size_t cbCopy)); /** * Queries a pointer to the memory buffer for the request from the drive/device above. * * @returns VBox status code. * @retval VERR_NOT_SUPPORTED if this is not supported for this request. * @param pInterface Pointer to the interface structure containing the called function pointer. * @param hIoBuf The I/O request handle. * @param pvIoBufAlloc The allocator specific memory for this request. * @param offBuf The offset from the start of the buffer to get the buffer address. * @param cbBuf The number of bytes requested. * @param ppvBuf Where to store the pointer to the guest buffer on success. * @param pcbBuf Where to store the size of the buffer on success. * * @note This is an optional feature of the entity implementing this interface to avoid overhead * by copying the data between buffers. If NULL it is not supported at all and the caller * has to resort to VDIOBUFCALLBACKS::pfnIoBufCopyToBuf and VDIOBUFCALLBACKS::pfnIoBufCopyFromBuf. * The same holds when VERR_NOT_SUPPORTED is returned. * * On the upside the caller of this interface might not call this method at all and just * use the before mentioned methods to copy the data between the buffers. */ DECLR3CALLBACKMEMBER(int, pfnIoBufQueryBuf, (PVDIOBUFCALLBACKS pInterface, VDIOBUF hIoBuf, void *pvIoBufAlloc, uint32_t offBuf, size_t cbBuf, void **ppvBuf, size_t *pcbBuf)); } VDIOBUFCALLBACKS; /** * Creates a new I/O buffer manager. * * @returns VBox status code. * @param phIoBufMgr Where to store the handle to the I/O buffer manager on success. * @param cbMax The maximum amount of I/O memory to allow. Trying to allocate more than * this will lead to out of memory errors. 0 for "unlimited" size (only restriction * is the available memory on the host). * @param fFlags Combination of VD_IOBUFMGR_F_*. * @param pIoBufClbks Memory copy callbacks between source and target memory regions, optional. * When NULL all I/O buffers must be allocated with a valid S/G buffer laying out the * memory. * @param cbIoBufAlloc How much to allocate extra in the I/O buffer for private use. */ VBOXDDU_DECL(int) VDIoBufMgrCreate(PVDIOBUFMGR phIoBufMgr, size_t cbMax, uint32_t fFlags, PVDIOBUFCALLBACKS pIoBufClbks, size_t cbIoBufAlloc); /** * Destroys the given I/O buffer manager. * * @returns VBox status code. * @retval VERR_INVALID_STATE if there are still buffers allocated by the given manager. * @param hIoBufMgr The I/O buffer manager. */ VBOXDDU_DECL(int) VDIoBufMgrDestroy(VDIOBUFMGR hIoBufMgr); /** * Allocate a new I/O buffer handle. * * @returns VBox status code. * @param hIoBufMgr The I/O buffer manager to use. * @param phIoBuf Where to store the I/O buffer handle on success. * @param ppvIoBufAlloc Where to store the pointe to the private party on success. * @param pSgBuf The S/G buffer to use, optional. If NULL the I/O buffer callbacks * supplied when creating the owning manager are used to transfer the * data. * @param cbBuf Size of the buffer in bytes. */ VBOXDDU_DECL(int) VDIoBufMgrAllocBuf(VDIOBUFMGR hIoBufMgr, PVDIOBUF phIoBuf, void **ppvIoBufAlloc, PCRTSGBUF pSgBuf, size_t cbBuf); /** * Retains the I/O buffer reference count. * * @returns New reference count. * @param hIoBuf The I/O buffer handle. */ VBOXDDU_DECL(uint32_t) VDIoBufRetain(VDIOBUF hIoBuf); /** * Releases the given I/O buffer reference. * * @returns New reference count, on 0 the I/O buffer is destroyed. * @param hIoBuf The I/O buffer handle. */ VBOXDDU_DECL(uint32_t) VDIoBufRelease(VDIOBUF hIoBuf); /** @} */ /** @defgroup grp_vd_ioqueue I/O queues * @{ */ /** VD I/O queue handle. */ typedef struct VDIOQUEUEINT *VDIOQUEUE; /** Pointer to an VD I/O queue handle. */ typedef VDIOQUEUE *PVDIOQUEUE; /** VD I/O queue request handle. */ typedef struct VDIOREQINT *VDIOREQ; /** Pointer to an VD I/O queue request handle. */ typedef VDIOREQ *PVDIOREQ; /** A I/O request ID. */ typedef uint64_t VDIOREQID; /** * I/O request type. */ typedef enum VDIOREQTYPE { /** Invalid request type. */ VDIOREQTYPE_INVALID = 0, /** Read request. */ VDIOREQTYPE_READ, /** Write request. */ VDIOREQTYPE_WRITE, /** Flush request. */ VDIOREQTYPE_FLUSH, /** Discard request. */ VDIOREQTYPE_DISCARD, /** 32bit hack. */ VDIOREQTYPE_32BIT_HACK = 0x7fffffff } VDIOREQTYPE; /** Pointer to a request type. */ typedef VDIOREQTYPE *PVDIOREQTYPE; /** * I/O queue request completion callback. * * @param hVdIoQueue The VD I/O queue handle. * @param pDisk The disk the queue is attached to. * @param hVdIoReq The VD I/O request which completed. * @param pvVdIoReq Pointer to the allocator specific memory for this request. * @param rcReq The completion status code. */ typedef DECLCALLBACKTYPE(void, FNVDIOQUEUEREQCOMPLETE,(VDIOQUEUE hVdIoQueue, PVDISK pDisk, VDIOREQ hVdIoReq, void *pvVdIoReq, int rcReq)); /** Pointer to a VD I/O queue request completion callback. */ typedef FNVDIOQUEUEREQCOMPLETE *PFNVDIOQUEUEREQCOMPLETE; /** * Creates a new I/O queue. * * @returns VBox status code. * @param phVdIoQueue Where to store the handle to the I/O queue on success. * @param pfnIoReqComplete The completion handle to call when a request on the specified queue completes. * @param cbIoReqAlloc The extra amount of memory to allocate and associate with allocated requests * for use by the caller. * @param iPriority The priority of the queue from 0..UINT32_MAX. The lower the number the higher * the priority of the queue. */ VBOXDDU_DECL(int) VDIoQueueCreate(PVDIOQUEUE phVdIoQueue, PFNVDIOQUEUEREQCOMPLETE pfnIoReqComplete, size_t cbIoReqAlloc, uint32_t iPriority); /** * Destroys the given I/O queue. * * @returns VBox status code. * @param hVdIoQueue The I/O queue handle. */ VBOXDDU_DECL(int) VDIoQueueDestroy(VDIOQUEUE hVdIoQueue); /** * Attaches the given I/O queue to the given virtual disk container. * * @returns VBox status code. * @param pDisk The disk container handle. * @param hVdIoQueue The I/O queue to attach. */ VBOXDDU_DECL(int) VDIoQueueAttach(PVDISK pDisk, VDIOQUEUE hVdIoQueue); /** * Detaches the given I/O queue from the currently attached disk container. * * @returns VBox status code. * @param hVdIoQueue The I/O queue. * @param fPurge Flag whether to cancel all active requests on this queue * before detaching. */ VBOXDDU_DECL(int) VDIoQueueDetach(VDIOQUEUE hVdIoQueue, bool fPurge); /** * Purges all requests on the given queue. * * @returns VBox status code. * @param hVdIoQueue The I/O queue. */ VBOXDDU_DECL(int) VDIoQueuePurge(VDIOQUEUE hVdIoQueue); /** * Allocates a new request from the given queue. * * @returns VBox status code. * @param hVdIoQueue The I/O queue. * @param phVdIoReq Where to store the handle of the request on success. * @param ppvVdIoReq Where to store the pointer to the allocator usable memory on success. * @param uIoReqId The request ID to assign to the request for canceling. */ VBOXDDU_DECL(int) VDIoQueueReqAlloc(VDIOQUEUE hVdIoQueue, PVDIOREQ phVdIoReq, void **ppvVdIoReq, VDIOREQID uIoReqId); /** * Frees a given non active request. * * @returns VBox status code. * @param hVdIoReq The I/O request to free. */ VBOXDDU_DECL(int) VDIoQueueReqFree(VDIOREQ hVdIoReq); /** * Cancels an active request by the given request ID. * * @returns VBox status code. * @param hVdIoQueue The I/O queue to cancel the request on. * @param uIoReqId The request ID. */ VBOXDDU_DECL(int) VDIoQueueReqCancelById(VDIOQUEUE hVdIoQueue, VDIOREQID uIoReqId); /** * Cancels an active request by the given handle. * * @returns VBox status code. * @param hVdIoReq The I/O request handle to cancel. */ VBOXDDU_DECL(int) VDIoQueueReqCancelByHandle(VDIOREQ hVdIoReq); /** * Submit a new request to the queue the request was allocated from. * * @returns VBox status code. * @param hVdIoReq The I/O request handle to submit. * @param enmType The type of the request. * @param hVdIoIter The iterator to use, NULL for flush requests. * @param hVdIoBuf The I/O buffer handle to use, NULL for flush and discard requests. */ VBOXDDU_DECL(int) VDIoQueueReqSubmit(VDIOREQ hVdIoReq, VDIOREQTYPE enmType, VDIOITER hVdIoIter, VDIOBUF hVdIoBuf); /** @} */ RT_C_DECLS_END /** @} */ #endif /* !VBOX_INCLUDED_vd_h */