| 1 | /** @file
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| 2 | * Internal VD filter backend interface.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2014 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef __vd_filter_backend_h__
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| 27 | #define __vd_filter_backend_h__
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| 28 |
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| 29 | #include <VBox/vd.h>
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| 30 | #include <VBox/vd-ifs-internal.h>
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| 31 |
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| 32 | /**
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| 33 | * VD filter backend interface.
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| 34 | */
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| 35 | typedef struct VDFILTERBACKEND
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| 36 | {
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| 37 | /**
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| 38 | * The name of the backend (constant string).
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| 39 | */
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| 40 | const char *pszBackendName;
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| 41 |
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| 42 | /**
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| 43 | * The size of the structure.
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| 44 | */
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| 45 | uint32_t cbSize;
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| 46 |
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| 47 | /**
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| 48 | * Pointer to an array of structs describing each supported config key.
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| 49 | * Terminated by a NULL config key. Note that some backends do not support
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| 50 | * the configuration interface, so this pointer may just contain NULL.
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| 51 | * Mandatory if the backend sets VD_CAP_CONFIG.
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| 52 | */
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| 53 | PCVDCONFIGINFO paConfigInfo;
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| 54 |
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| 55 | /**
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| 56 | * Creates a new filter instance.
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| 57 | *
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| 58 | * @returns VBox status code.
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| 59 | * @param pVDIfsDisk Pointer to the per-disk VD interface list.
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| 60 | * @param pVDIfsFilter Pointer to the per-filter VD interface list.
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| 61 | * @param ppvBackendData Opaque state data for this filter instance.
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| 62 | */
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| 63 | DECLR3CALLBACKMEMBER(int, pfnCreate, (PVDINTERFACE pVDIfsDisk,
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| 64 | PVDINTERFACE pVDIfsFilter,
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| 65 | void **ppvBackendData));
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| 66 |
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| 67 | /**
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| 68 | * Destroys a filter instance.
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| 69 | *
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| 70 | * @returns VBox status code.
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| 71 | * @param pvBackendData Opaque state data for the filter instance to destroy.
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| 72 | */
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| 73 | DECLR3CALLBACKMEMBER(int, pfnDestroy, (void *pvBackendData));
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| 74 |
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| 75 | /**
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| 76 | * Filters the data of a read from the image chain. The filter is applied
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| 77 | * after everything was read.
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| 78 | *
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| 79 | * @returns VBox status code.
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| 80 | * @param pvBackendData Opaque state data for the filter instance.
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| 81 | * @param uOffset Start offset of the read.
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| 82 | * @param cbRead Number of bytes read.
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| 83 | * @param pIoCtx The I/O context holding the read data.
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| 84 | */
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| 85 | DECLR3CALLBACKMEMBER(int, pfnFilterRead, (void *pvBackendData, uint64_t uOffset, size_t cbRead,
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| 86 | PVDIOCTX pIoCtx));
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| 87 |
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| 88 | /**
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| 89 | * Filters the data of a write to the image chain. The filter is applied
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| 90 | * before everything is written.
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| 91 | *
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| 92 | * @returns VBox status code.
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| 93 | * @param pvBackendData Opaque state data for the filter instance.
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| 94 | * @param uOffset Start offset of the write.
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| 95 | * @param cbWrite Number of bytes to be written.
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| 96 | * @param pIoCtx The I/O context holding the data to write.
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| 97 | */
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| 98 | DECLR3CALLBACKMEMBER(int, pfnFilterWrite, (void *pvBackendData, uint64_t uOffset, size_t cbWrite,
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| 99 | PVDIOCTX pIoCtx));
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| 100 |
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| 101 | } VDFILTERBACKEND;
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| 102 | /** Pointer to VD filter backend. */
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| 103 | typedef VDFILTERBACKEND *PVDFILTERBACKEND;
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| 104 | /** Constant pointer to a VD filter backend. */
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| 105 | typedef const VDFILTERBACKEND *PCVDFILTERBACKEND;
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| 106 |
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| 107 | #endif
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