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| -rw-r--r-- | include/VBox/vd-cache-backend.h | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/include/VBox/vd-cache-backend.h b/include/VBox/vd-cache-backend.h new file mode 100644 index 00000000..c2d7163f --- /dev/null +++ b/include/VBox/vd-cache-backend.h @@ -0,0 +1,332 @@ +/** @file + * Internal hard disk format support API for VBoxHDD cache images. + */ + +/* + * Copyright (C) 2006-2022 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 <https://www.gnu.org/licenses>. + * + * 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_cache_backend_h +#define VBOX_INCLUDED_vd_cache_backend_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <VBox/vd.h> +#include <VBox/vd-common.h> +#include <VBox/vd-ifs-internal.h> + +/** + * Cache format backend interface used by VBox HDD Container implementation. + */ +typedef struct VDCACHEBACKEND +{ + /** Structure version. VD_CACHEBACKEND_VERSION defines the current version. */ + uint32_t u32Version; + /** The name of the backend (constant string). */ + const char *pszBackendName; + /** The capabilities of the backend. */ + 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. + */ + const char * const *papszFileExtensions; + + /** + * 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; + + /** + * Probes the given image. + * + * @returns VBox status code. + * @param pszFilename Name of the image file. + * @param pVDIfsDisk Pointer to the per-disk VD interface list. + * @param pVDIfsImage Pointer to the per-image VD interface list. + */ + DECLR3CALLBACKMEMBER(int, pfnProbe, (const char *pszFilename, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage)); + + /** + * Open a cache image. + * + * @returns VBox status code. + * @param pszFilename Name of the image file to open. Guaranteed to be available and + * unchanged during the lifetime of this image. + * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. + * @param pVDIfsDisk Pointer to the per-disk VD interface list. + * @param pVDIfsImage Pointer to the per-image VD interface list. + * @param ppBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(int, pfnOpen, (const char *pszFilename, unsigned uOpenFlags, + PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage, + void **ppBackendData)); + + /** + * Create a cache image. + * + * @returns VBox status code. + * @param pszFilename Name of the image file to create. Guaranteed to be available and + * unchanged during the lifetime of this image. + * @param cbSize Image size in bytes. + * @param uImageFlags Flags specifying special image features. + * @param pszComment Pointer to image comment. NULL is ok. + * @param pUuid New UUID of the image. Not NULL. + * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants. + * @param uPercentStart Starting value for progress percentage. + * @param uPercentSpan Span for varying progress percentage. + * @param pVDIfsDisk Pointer to the per-disk VD interface list. + * @param pVDIfsImage Pointer to the per-image VD interface list. + * @param pVDIfsOperation Pointer to the per-operation VD interface list. + * @param ppBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(int, pfnCreate, (const char *pszFilename, uint64_t cbSize, + unsigned uImageFlags, const char *pszComment, + PCRTUUID pUuid, unsigned uOpenFlags, + unsigned uPercentStart, unsigned uPercentSpan, + PVDINTERFACE pVDIfsDisk, + PVDINTERFACE pVDIfsImage, + PVDINTERFACE pVDIfsOperation, + void **ppBackendData)); + + /** + * Close a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param fDelete If true, delete the image from the host disk. + */ + DECLR3CALLBACKMEMBER(int, pfnClose, (void *pBackendData, bool fDelete)); + + /** + * Start a read request. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param uOffset The offset of the virtual disk to read from. + * @param cbToRead How many bytes to read. + * @param pIoCtx I/O context associated with this request. + * @param pcbActuallyRead Pointer to returned number of bytes read. + */ + DECLR3CALLBACKMEMBER(int, pfnRead, (void *pBackendData, uint64_t uOffset, size_t cbToRead, + PVDIOCTX pIoCtx, size_t *pcbActuallyRead)); + + /** + * Start a write request. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param uOffset The offset of the virtual disk to write to. + * @param cbToWrite How many bytes to write. + * @param pIoCtx I/O context associated with this request. + * @param pcbWriteProcess Pointer to returned number of bytes that could + * be processed. In case the function returned + * VERR_VD_BLOCK_FREE this is the number of bytes + * that could be written in a full block write, + * when prefixed/postfixed by the appropriate + * amount of (previously read) padding data. + */ + DECLR3CALLBACKMEMBER(int, pfnWrite, (void *pBackendData, uint64_t uOffset, size_t cbToWrite, + PVDIOCTX pIoCtx, size_t *pcbWriteProcess)); + + /** + * Flush data to disk. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pIoCtx I/O context associated with this request. + */ + DECLR3CALLBACKMEMBER(int, pfnFlush, (void *pBackendData, PVDIOCTX pIoCtx)); + + /** + * Discards the given amount of bytes from the cache. + * + * @returns VBox status code. + * @retval VERR_VD_DISCARD_ALIGNMENT_NOT_MET if the range doesn't meet the required alignment + * for the discard. + * @param pBackendData Opaque state data for this image. + * @param pIoCtx I/O context associated with this request. + * @param uOffset The offset of the first byte to discard. + * @param cbDiscard How many bytes to discard. + */ + DECLR3CALLBACKMEMBER(int, pfnDiscard, (void *pBackendData, PVDIOCTX pIoCtx, + uint64_t uOffset, size_t cbDiscard, + size_t *pcbPreAllocated, + size_t *pcbPostAllocated, + size_t *pcbActuallyDiscarded, + void **ppbmAllocationBitmap, + unsigned fDiscard)); + + /** + * Get the version of a cache image. + * + * @returns version of cache image. + * @param pBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(unsigned, pfnGetVersion, (void *pBackendData)); + + /** + * Get the capacity of a cache image. + * + * @returns size of cache image in bytes. + * @param pBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(uint64_t, pfnGetSize, (void *pBackendData)); + + /** + * Get the file size of a cache image. + * + * @returns size of cache image in bytes. + * @param pBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(uint64_t, pfnGetFileSize, (void *pBackendData)); + + /** + * Get the image flags of a cache image. + * + * @returns image flags of cache image. + * @param pBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(unsigned, pfnGetImageFlags, (void *pBackendData)); + + /** + * Get the open flags of a cache image. + * + * @returns open flags of cache image. + * @param pBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(unsigned, pfnGetOpenFlags, (void *pBackendData)); + + /** + * Set the open flags of a cache image. May cause the image to be locked + * in a different mode or be reopened (which can fail). + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param uOpenFlags New open flags for this image. + */ + DECLR3CALLBACKMEMBER(int, pfnSetOpenFlags, (void *pBackendData, unsigned uOpenFlags)); + + /** + * Get comment of a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pszComment Where to store the comment. + * @param cbComment Size of the comment buffer. + */ + DECLR3CALLBACKMEMBER(int, pfnGetComment, (void *pBackendData, char *pszComment, size_t cbComment)); + + /** + * Set comment of a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pszComment Where to get the comment from. NULL resets comment. + * The comment is silently truncated if the image format + * limit is exceeded. + */ + DECLR3CALLBACKMEMBER(int, pfnSetComment, (void *pBackendData, const char *pszComment)); + + /** + * Get UUID of a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pUuid Where to store the image UUID. + */ + DECLR3CALLBACKMEMBER(int, pfnGetUuid, (void *pBackendData, PRTUUID pUuid)); + + /** + * Set UUID of a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pUuid Where to get the image UUID from. + */ + DECLR3CALLBACKMEMBER(int, pfnSetUuid, (void *pBackendData, PCRTUUID pUuid)); + + /** + * Get last modification UUID of a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pUuid Where to store the image modification UUID. + */ + DECLR3CALLBACKMEMBER(int, pfnGetModificationUuid, (void *pBackendData, PRTUUID pUuid)); + + /** + * Set last modification UUID of a cache image. + * + * @returns VBox status code. + * @param pBackendData Opaque state data for this image. + * @param pUuid Where to get the image modification UUID from. + */ + DECLR3CALLBACKMEMBER(int, pfnSetModificationUuid, (void *pBackendData, PCRTUUID pUuid)); + + /** + * Dump information about a cache image. + * + * @param pBackendData Opaque state data for this image. + */ + DECLR3CALLBACKMEMBER(void, pfnDump, (void *pBackendData)); + + /** 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)); + + /** Initialization safty marker. */ + uint32_t u32VersionEnd; + +} VDCACHEBACKEND; +/** Pointer to VD cache backend. */ +typedef VDCACHEBACKEND *PVDCACHEBACKEND; +/** Constant pointer to VD backend. */ +typedef const VDCACHEBACKEND *PCVDCACHEBACKEND; + +/** The current version of the VDCACHEBACKEND structure. */ +#define VD_CACHEBACKEND_VERSION VD_VERSION_MAKE(0xff03, 1, 0) + +#endif /* !VBOX_INCLUDED_vd_cache_backend_h */ |