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diff --git a/include/VBox/vd.h b/include/VBox/vd.h new file mode 100644 index 00000000..41b3016d --- /dev/null +++ b/include/VBox/vd.h @@ -0,0 +1,1805 @@ +/** @file + * VBox HDD Container API. + */ + +/* + * Copyright (C) 2006-2019 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. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + +#ifndef VBOX_INCLUDED_vd_h +#define VBOX_INCLUDED_vd_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/assert.h> +#include <iprt/string.h> +#include <iprt/mem.h> +#include <iprt/file.h> +#include <iprt/net.h> +#include <iprt/sg.h> +#include <iprt/vfs.h> +#include <VBox/cdefs.h> +#include <VBox/types.h> +#include <VBox/vdmedia.h> +#include <VBox/vd-ifs.h> + +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 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. */ + const 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. */ + const void *pvPartitionData; + /** Offset where the data starts in this device. */ + uint64_t uStartOffset; + /** Offset where the data starts in the disk. */ + uint64_t uStart; + /** Size of the data area. */ + uint64_t cbData; + /** Flags for special treatment, see VDISKRAW_FLAGS_*. */ + uint32_t uFlags; +} VDISKRAWPARTDESC, *PVDISKRAWPARTDESC; + +/** + * Auxiliary data structure for difference between GPT and MBR + * disks. + */ +typedef enum VDISKPARTTYPE +{ + MBR, + 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_FLAGS_*. */ + /** Flag whether access to full disk should be given (ignoring the + * partition information below). */ + 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. */ + const char *pszRawDisk; + /** Number of entries in the partition descriptor array. */ + unsigned cPartDescs; + /** Pointer to the partition descriptor array. */ + PVDISKRAWPARTDESC pPartDescs; + /** Partitioning type of the disk */ + VDISKPARTTYPE uPartitioningType; +} 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) +/** @}*/ + + +/** + * 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 DECLCALLBACK(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 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, 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 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 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 nImage, PVDISK pDiskTo, + 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(). + * + * @return nothing. + * @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 pcSgBuf 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 pcSgBuf, + 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 pcSgBuf 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 pcSgBuf, + 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_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. + * + * @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. + * + * @returns nothing. + * @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 DECLCALLBACK(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 */ + |