| 1 | /** @file
|
|---|
| 2 | * Internal hard disk format support API for VBoxHDD cache images.
|
|---|
| 3 | */
|
|---|
| 4 |
|
|---|
| 5 | /*
|
|---|
| 6 | * Copyright (C) 2006-2017 Oracle Corporation
|
|---|
| 7 | *
|
|---|
| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 9 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 10 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 11 | * General Public License (GPL) as published by the Free Software
|
|---|
| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 15 | *
|
|---|
| 16 | * The contents of this file may alternatively be used under the terms
|
|---|
| 17 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 19 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 20 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 21 | *
|
|---|
| 22 | * You may elect to license modified versions of this file under the
|
|---|
| 23 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 24 | */
|
|---|
| 25 |
|
|---|
| 26 | #ifndef ___VBox_vd_cache_backend_h
|
|---|
| 27 | #define ___VBox_vd_cache_backend_h
|
|---|
| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
|
|---|
| 29 | # pragma once
|
|---|
| 30 | #endif
|
|---|
| 31 |
|
|---|
| 32 | #include <VBox/vd.h>
|
|---|
| 33 | #include <VBox/vd-common.h>
|
|---|
| 34 | #include <VBox/vd-ifs-internal.h>
|
|---|
| 35 |
|
|---|
| 36 | /**
|
|---|
| 37 | * Cache format backend interface used by VBox HDD Container implementation.
|
|---|
| 38 | */
|
|---|
| 39 | typedef struct VDCACHEBACKEND
|
|---|
| 40 | {
|
|---|
| 41 | /** Structure version. VD_CACHEBACKEND_VERSION defines the current version. */
|
|---|
| 42 | uint32_t u32Version;
|
|---|
| 43 | /** The name of the backend (constant string). */
|
|---|
| 44 | const char *pszBackendName;
|
|---|
| 45 | /** The capabilities of the backend. */
|
|---|
| 46 | uint64_t uBackendCaps;
|
|---|
| 47 |
|
|---|
| 48 | /**
|
|---|
| 49 | * Pointer to a NULL-terminated array of strings, containing the supported
|
|---|
| 50 | * file extensions. Note that some backends do not work on files, so this
|
|---|
| 51 | * pointer may just contain NULL.
|
|---|
| 52 | */
|
|---|
| 53 | const char * const *papszFileExtensions;
|
|---|
| 54 |
|
|---|
| 55 | /**
|
|---|
| 56 | * Pointer to an array of structs describing each supported config key.
|
|---|
| 57 | * Terminated by a NULL config key. Note that some backends do not support
|
|---|
| 58 | * the configuration interface, so this pointer may just contain NULL.
|
|---|
| 59 | * Mandatory if the backend sets VD_CAP_CONFIG.
|
|---|
| 60 | */
|
|---|
| 61 | PCVDCONFIGINFO paConfigInfo;
|
|---|
| 62 |
|
|---|
| 63 | /**
|
|---|
| 64 | * Probes the given image.
|
|---|
| 65 | *
|
|---|
| 66 | * @returns VBox status code.
|
|---|
| 67 | * @param pszFilename Name of the image file.
|
|---|
| 68 | * @param pVDIfsDisk Pointer to the per-disk VD interface list.
|
|---|
| 69 | * @param pVDIfsImage Pointer to the per-image VD interface list.
|
|---|
| 70 | */
|
|---|
| 71 | DECLR3CALLBACKMEMBER(int, pfnProbe, (const char *pszFilename, PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage));
|
|---|
| 72 |
|
|---|
| 73 | /**
|
|---|
| 74 | * Open a cache image.
|
|---|
| 75 | *
|
|---|
| 76 | * @returns VBox status code.
|
|---|
| 77 | * @param pszFilename Name of the image file to open. Guaranteed to be available and
|
|---|
| 78 | * unchanged during the lifetime of this image.
|
|---|
| 79 | * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants.
|
|---|
| 80 | * @param pVDIfsDisk Pointer to the per-disk VD interface list.
|
|---|
| 81 | * @param pVDIfsImage Pointer to the per-image VD interface list.
|
|---|
| 82 | * @param ppBackendData Opaque state data for this image.
|
|---|
| 83 | */
|
|---|
| 84 | DECLR3CALLBACKMEMBER(int, pfnOpen, (const char *pszFilename, unsigned uOpenFlags,
|
|---|
| 85 | PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
|
|---|
| 86 | void **ppBackendData));
|
|---|
| 87 |
|
|---|
| 88 | /**
|
|---|
| 89 | * Create a cache image.
|
|---|
| 90 | *
|
|---|
| 91 | * @returns VBox status code.
|
|---|
| 92 | * @param pszFilename Name of the image file to create. Guaranteed to be available and
|
|---|
| 93 | * unchanged during the lifetime of this image.
|
|---|
| 94 | * @param cbSize Image size in bytes.
|
|---|
| 95 | * @param uImageFlags Flags specifying special image features.
|
|---|
| 96 | * @param pszComment Pointer to image comment. NULL is ok.
|
|---|
| 97 | * @param pUuid New UUID of the image. Not NULL.
|
|---|
| 98 | * @param uOpenFlags Image file open mode, see VD_OPEN_FLAGS_* constants.
|
|---|
| 99 | * @param uPercentStart Starting value for progress percentage.
|
|---|
| 100 | * @param uPercentSpan Span for varying progress percentage.
|
|---|
| 101 | * @param pVDIfsDisk Pointer to the per-disk VD interface list.
|
|---|
| 102 | * @param pVDIfsImage Pointer to the per-image VD interface list.
|
|---|
| 103 | * @param pVDIfsOperation Pointer to the per-operation VD interface list.
|
|---|
| 104 | * @param ppBackendData Opaque state data for this image.
|
|---|
| 105 | */
|
|---|
| 106 | DECLR3CALLBACKMEMBER(int, pfnCreate, (const char *pszFilename, uint64_t cbSize,
|
|---|
| 107 | unsigned uImageFlags, const char *pszComment,
|
|---|
| 108 | PCRTUUID pUuid, unsigned uOpenFlags,
|
|---|
| 109 | unsigned uPercentStart, unsigned uPercentSpan,
|
|---|
| 110 | PVDINTERFACE pVDIfsDisk,
|
|---|
| 111 | PVDINTERFACE pVDIfsImage,
|
|---|
| 112 | PVDINTERFACE pVDIfsOperation,
|
|---|
| 113 | void **ppBackendData));
|
|---|
| 114 |
|
|---|
| 115 | /**
|
|---|
| 116 | * Close a cache image.
|
|---|
| 117 | *
|
|---|
| 118 | * @returns VBox status code.
|
|---|
| 119 | * @param pBackendData Opaque state data for this image.
|
|---|
| 120 | * @param fDelete If true, delete the image from the host disk.
|
|---|
| 121 | */
|
|---|
| 122 | DECLR3CALLBACKMEMBER(int, pfnClose, (void *pBackendData, bool fDelete));
|
|---|
| 123 |
|
|---|
| 124 | /**
|
|---|
| 125 | * Start a read request.
|
|---|
| 126 | *
|
|---|
| 127 | * @returns VBox status code.
|
|---|
| 128 | * @param pBackendData Opaque state data for this image.
|
|---|
| 129 | * @param uOffset The offset of the virtual disk to read from.
|
|---|
| 130 | * @param cbToRead How many bytes to read.
|
|---|
| 131 | * @param pIoCtx I/O context associated with this request.
|
|---|
| 132 | * @param pcbActuallyRead Pointer to returned number of bytes read.
|
|---|
| 133 | */
|
|---|
| 134 | DECLR3CALLBACKMEMBER(int, pfnRead, (void *pBackendData, uint64_t uOffset, size_t cbToRead,
|
|---|
| 135 | PVDIOCTX pIoCtx, size_t *pcbActuallyRead));
|
|---|
| 136 |
|
|---|
| 137 | /**
|
|---|
| 138 | * Start a write request.
|
|---|
| 139 | *
|
|---|
| 140 | * @returns VBox status code.
|
|---|
| 141 | * @param pBackendData Opaque state data for this image.
|
|---|
| 142 | * @param uOffset The offset of the virtual disk to write to.
|
|---|
| 143 | * @param cbToWrite How many bytes to write.
|
|---|
| 144 | * @param pIoCtx I/O context associated with this request.
|
|---|
| 145 | * @param pcbWriteProcess Pointer to returned number of bytes that could
|
|---|
| 146 | * be processed. In case the function returned
|
|---|
| 147 | * VERR_VD_BLOCK_FREE this is the number of bytes
|
|---|
| 148 | * that could be written in a full block write,
|
|---|
| 149 | * when prefixed/postfixed by the appropriate
|
|---|
| 150 | * amount of (previously read) padding data.
|
|---|
| 151 | */
|
|---|
| 152 | DECLR3CALLBACKMEMBER(int, pfnWrite, (void *pBackendData, uint64_t uOffset, size_t cbToWrite,
|
|---|
| 153 | PVDIOCTX pIoCtx, size_t *pcbWriteProcess));
|
|---|
| 154 |
|
|---|
| 155 | /**
|
|---|
| 156 | * Flush data to disk.
|
|---|
| 157 | *
|
|---|
| 158 | * @returns VBox status code.
|
|---|
| 159 | * @param pBackendData Opaque state data for this image.
|
|---|
| 160 | * @param pIoCtx I/O context associated with this request.
|
|---|
| 161 | */
|
|---|
| 162 | DECLR3CALLBACKMEMBER(int, pfnFlush, (void *pBackendData, PVDIOCTX pIoCtx));
|
|---|
| 163 |
|
|---|
| 164 | /**
|
|---|
| 165 | * Discards the given amount of bytes from the cache.
|
|---|
| 166 | *
|
|---|
| 167 | * @returns VBox status code.
|
|---|
| 168 | * @retval VERR_VD_DISCARD_ALIGNMENT_NOT_MET if the range doesn't meet the required alignment
|
|---|
| 169 | * for the discard.
|
|---|
| 170 | * @param pBackendData Opaque state data for this image.
|
|---|
| 171 | * @param pIoCtx I/O context associated with this request.
|
|---|
| 172 | * @param uOffset The offset of the first byte to discard.
|
|---|
| 173 | * @param cbDiscard How many bytes to discard.
|
|---|
| 174 | */
|
|---|
| 175 | DECLR3CALLBACKMEMBER(int, pfnDiscard, (void *pBackendData, PVDIOCTX pIoCtx,
|
|---|
| 176 | uint64_t uOffset, size_t cbDiscard,
|
|---|
| 177 | size_t *pcbPreAllocated,
|
|---|
| 178 | size_t *pcbPostAllocated,
|
|---|
| 179 | size_t *pcbActuallyDiscarded,
|
|---|
| 180 | void **ppbmAllocationBitmap,
|
|---|
| 181 | unsigned fDiscard));
|
|---|
| 182 |
|
|---|
| 183 | /**
|
|---|
| 184 | * Get the version of a cache image.
|
|---|
| 185 | *
|
|---|
| 186 | * @returns version of cache image.
|
|---|
| 187 | * @param pBackendData Opaque state data for this image.
|
|---|
| 188 | */
|
|---|
| 189 | DECLR3CALLBACKMEMBER(unsigned, pfnGetVersion, (void *pBackendData));
|
|---|
| 190 |
|
|---|
| 191 | /**
|
|---|
| 192 | * Get the capacity of a cache image.
|
|---|
| 193 | *
|
|---|
| 194 | * @returns size of cache image in bytes.
|
|---|
| 195 | * @param pBackendData Opaque state data for this image.
|
|---|
| 196 | */
|
|---|
| 197 | DECLR3CALLBACKMEMBER(uint64_t, pfnGetSize, (void *pBackendData));
|
|---|
| 198 |
|
|---|
| 199 | /**
|
|---|
| 200 | * Get the file size of a cache image.
|
|---|
| 201 | *
|
|---|
| 202 | * @returns size of cache image in bytes.
|
|---|
| 203 | * @param pBackendData Opaque state data for this image.
|
|---|
| 204 | */
|
|---|
| 205 | DECLR3CALLBACKMEMBER(uint64_t, pfnGetFileSize, (void *pBackendData));
|
|---|
| 206 |
|
|---|
| 207 | /**
|
|---|
| 208 | * Get the image flags of a cache image.
|
|---|
| 209 | *
|
|---|
| 210 | * @returns image flags of cache image.
|
|---|
| 211 | * @param pBackendData Opaque state data for this image.
|
|---|
| 212 | */
|
|---|
| 213 | DECLR3CALLBACKMEMBER(unsigned, pfnGetImageFlags, (void *pBackendData));
|
|---|
| 214 |
|
|---|
| 215 | /**
|
|---|
| 216 | * Get the open flags of a cache image.
|
|---|
| 217 | *
|
|---|
| 218 | * @returns open flags of cache image.
|
|---|
| 219 | * @param pBackendData Opaque state data for this image.
|
|---|
| 220 | */
|
|---|
| 221 | DECLR3CALLBACKMEMBER(unsigned, pfnGetOpenFlags, (void *pBackendData));
|
|---|
| 222 |
|
|---|
| 223 | /**
|
|---|
| 224 | * Set the open flags of a cache image. May cause the image to be locked
|
|---|
| 225 | * in a different mode or be reopened (which can fail).
|
|---|
| 226 | *
|
|---|
| 227 | * @returns VBox status code.
|
|---|
| 228 | * @param pBackendData Opaque state data for this image.
|
|---|
| 229 | * @param uOpenFlags New open flags for this image.
|
|---|
| 230 | */
|
|---|
| 231 | DECLR3CALLBACKMEMBER(int, pfnSetOpenFlags, (void *pBackendData, unsigned uOpenFlags));
|
|---|
| 232 |
|
|---|
| 233 | /**
|
|---|
| 234 | * Get comment of a cache image.
|
|---|
| 235 | *
|
|---|
| 236 | * @returns VBox status code.
|
|---|
| 237 | * @param pBackendData Opaque state data for this image.
|
|---|
| 238 | * @param pszComment Where to store the comment.
|
|---|
| 239 | * @param cbComment Size of the comment buffer.
|
|---|
| 240 | */
|
|---|
| 241 | DECLR3CALLBACKMEMBER(int, pfnGetComment, (void *pBackendData, char *pszComment, size_t cbComment));
|
|---|
| 242 |
|
|---|
| 243 | /**
|
|---|
| 244 | * Set comment of a cache image.
|
|---|
| 245 | *
|
|---|
| 246 | * @returns VBox status code.
|
|---|
| 247 | * @param pBackendData Opaque state data for this image.
|
|---|
| 248 | * @param pszComment Where to get the comment from. NULL resets comment.
|
|---|
| 249 | * The comment is silently truncated if the image format
|
|---|
| 250 | * limit is exceeded.
|
|---|
| 251 | */
|
|---|
| 252 | DECLR3CALLBACKMEMBER(int, pfnSetComment, (void *pBackendData, const char *pszComment));
|
|---|
| 253 |
|
|---|
| 254 | /**
|
|---|
| 255 | * Get UUID of a cache image.
|
|---|
| 256 | *
|
|---|
| 257 | * @returns VBox status code.
|
|---|
| 258 | * @param pBackendData Opaque state data for this image.
|
|---|
| 259 | * @param pUuid Where to store the image UUID.
|
|---|
| 260 | */
|
|---|
| 261 | DECLR3CALLBACKMEMBER(int, pfnGetUuid, (void *pBackendData, PRTUUID pUuid));
|
|---|
| 262 |
|
|---|
| 263 | /**
|
|---|
| 264 | * Set UUID of a cache image.
|
|---|
| 265 | *
|
|---|
| 266 | * @returns VBox status code.
|
|---|
| 267 | * @param pBackendData Opaque state data for this image.
|
|---|
| 268 | * @param pUuid Where to get the image UUID from.
|
|---|
| 269 | */
|
|---|
| 270 | DECLR3CALLBACKMEMBER(int, pfnSetUuid, (void *pBackendData, PCRTUUID pUuid));
|
|---|
| 271 |
|
|---|
| 272 | /**
|
|---|
| 273 | * Get last modification UUID of a cache image.
|
|---|
| 274 | *
|
|---|
| 275 | * @returns VBox status code.
|
|---|
| 276 | * @param pBackendData Opaque state data for this image.
|
|---|
| 277 | * @param pUuid Where to store the image modification UUID.
|
|---|
| 278 | */
|
|---|
| 279 | DECLR3CALLBACKMEMBER(int, pfnGetModificationUuid, (void *pBackendData, PRTUUID pUuid));
|
|---|
| 280 |
|
|---|
| 281 | /**
|
|---|
| 282 | * Set last modification UUID of a cache image.
|
|---|
| 283 | *
|
|---|
| 284 | * @returns VBox status code.
|
|---|
| 285 | * @param pBackendData Opaque state data for this image.
|
|---|
| 286 | * @param pUuid Where to get the image modification UUID from.
|
|---|
| 287 | */
|
|---|
| 288 | DECLR3CALLBACKMEMBER(int, pfnSetModificationUuid, (void *pBackendData, PCRTUUID pUuid));
|
|---|
| 289 |
|
|---|
| 290 | /**
|
|---|
| 291 | * Dump information about a cache image.
|
|---|
| 292 | *
|
|---|
| 293 | * @param pBackendData Opaque state data for this image.
|
|---|
| 294 | */
|
|---|
| 295 | DECLR3CALLBACKMEMBER(void, pfnDump, (void *pBackendData));
|
|---|
| 296 |
|
|---|
| 297 | /** Returns a human readable hard disk location string given a
|
|---|
| 298 | * set of hard disk configuration keys. The returned string is an
|
|---|
| 299 | * equivalent of the full file path for image-based hard disks.
|
|---|
| 300 | * Mandatory for backends with no VD_CAP_FILE and NULL otherwise. */
|
|---|
| 301 | DECLR3CALLBACKMEMBER(int, pfnComposeLocation, (PVDINTERFACE pConfig, char **pszLocation));
|
|---|
| 302 |
|
|---|
| 303 | /** Returns a human readable hard disk name string given a
|
|---|
| 304 | * set of hard disk configuration keys. The returned string is an
|
|---|
| 305 | * equivalent of the file name part in the full file path for
|
|---|
| 306 | * image-based hard disks. Mandatory for backends with no
|
|---|
| 307 | * VD_CAP_FILE and NULL otherwise. */
|
|---|
| 308 | DECLR3CALLBACKMEMBER(int, pfnComposeName, (PVDINTERFACE pConfig, char **pszName));
|
|---|
| 309 |
|
|---|
| 310 | /** Initialization safty marker. */
|
|---|
| 311 | uint32_t u32VersionEnd;
|
|---|
| 312 |
|
|---|
| 313 | } VDCACHEBACKEND;
|
|---|
| 314 | /** Pointer to VD cache backend. */
|
|---|
| 315 | typedef VDCACHEBACKEND *PVDCACHEBACKEND;
|
|---|
| 316 | /** Constant pointer to VD backend. */
|
|---|
| 317 | typedef const VDCACHEBACKEND *PCVDCACHEBACKEND;
|
|---|
| 318 |
|
|---|
| 319 | /** The current version of the VDCACHEBACKEND structure. */
|
|---|
| 320 | #define VD_CACHEBACKEND_VERSION VD_VERSION_MAKE(0xff03, 1, 0)
|
|---|
| 321 |
|
|---|
| 322 | #endif
|
|---|
