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Diffstat (limited to 'include/iprt/dvm.h')
| -rw-r--r-- | include/iprt/dvm.h | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/include/iprt/dvm.h b/include/iprt/dvm.h new file mode 100644 index 00000000..f36a5f10 --- /dev/null +++ b/include/iprt/dvm.h @@ -0,0 +1,379 @@ +/** @file + * IPRT Disk Volume Management API (DVM). + */ + +/* + * Copyright (C) 2011 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 ___iprt_dvm_h +#define ___iprt_dvm_h + +#include <iprt/types.h> + +RT_C_DECLS_BEGIN + + +/** @defgroup grp_dvm IPRT Disk Volume Management + * @{ + */ + +/** + * Volume type. + * Comparable to the FS type in MBR partition maps + * or the partition type GUIDs in GPT tables. + */ +typedef enum RTDVMVOLTYPE +{ + /** Invalid. */ + RTDVMVOLTYPE_INVALID = 0, + /** Unknown. */ + RTDVMVOLTYPE_UNKNOWN, + /** Volume hosts a NTFS filesystem. */ + RTDVMVOLTYPE_NTFS, + /** Volume hosts a FAT16 filesystem. */ + RTDVMVOLTYPE_FAT16, + /** Volume hosts a FAT32 filesystem. */ + RTDVMVOLTYPE_FAT32, + /** Volume hosts a Linux swap. */ + RTDVMVOLTYPE_LINUX_SWAP, + /** Volume hosts a Linux filesystem. */ + RTDVMVOLTYPE_LINUX_NATIVE, + /** Volume hosts a Linux LVM. */ + RTDVMVOLTYPE_LINUX_LVM, + /** Volume hosts a Linux SoftRaid. */ + RTDVMVOLTYPE_LINUX_SOFTRAID, + /** Volume hosts a FreeBSD disklabel. */ + RTDVMVOLTYPE_FREEBSD, + /** Volume hosts a NetBSD disklabel. */ + RTDVMVOLTYPE_NETBSD, + /** Volume hosts a OpenBSD disklabel. */ + RTDVMVOLTYPE_OPENBSD, + /** Volume hosts a Mac OS X HFS or HFS+ filesystem. */ + RTDVMVOLTYPE_MAC_OSX_HFS, + /** Volume hosts a Solaris volume. */ + RTDVMVOLTYPE_SOLARIS, + /** End of the valid values. */ + RTDVMVOLTYPE_END, + /** Usual 32bit hack. */ + RTDVMVOLTYPE_32BIT_HACK = 0x7fffffff +} RTDVMVOLTYPE; + +/** @defgroup grp_dvm_flags Flags used by RTDvmCreate. + * @{ */ +/** DVM flags - Blocks are always marked as unused if the volume has + * no block status callback set. + * The default is to mark them as used. */ +#define DVM_FLAGS_NO_STATUS_CALLBACK_MARK_AS_UNUSED RT_BIT_32(0) +/** DVM flags - Space which is unused in the map will be marked as used + * when calling RTDvmMapQueryBlockStatus(). */ +#define DVM_FLAGS_UNUSED_SPACE_MARK_AS_USED RT_BIT_32(1) +/** Mask of all valid flags. */ +#define DVM_FLAGS_MASK (DVM_FLAGS_NO_STATUS_CALLBACK_MARK_AS_UNUSED | DVM_FLAGS_UNUSED_SPACE_MARK_AS_USED) +/** @} */ + + +/** @defgroup grp_dvm_vol_flags Volume flags used by DVMVolumeGetFlags. + * @{ */ +/** Volume flags - Volume is bootable. */ +#define DVMVOLUME_FLAGS_BOOTABLE RT_BIT_64(0) +/** Volume flags - Volume is active. */ +#define DVMVOLUME_FLAGS_ACTIVE RT_BIT_64(1) +/** @} */ + +/** A handle to a volume manager. */ +typedef struct RTDVMINTERNAL *RTDVM; +/** A pointer to a volume manager handle. */ +typedef RTDVM *PRTDVM; +/** NIL volume manager handle. */ +#define NIL_RTDVM ((RTDVM)~0) + +/** A handle to a volume in a volume map. */ +typedef struct RTDVMVOLUMEINTERNAL *RTDVMVOLUME; +/** A pointer to a volume handle. */ +typedef RTDVMVOLUME *PRTDVMVOLUME; +/** NIL volume handle. */ +#define NIL_RTDVMVOLUME ((RTDVMVOLUME)~0) + +/** + * Callback to read data from the underlying medium. + * + * @returns IPRT status code. + * @param pvUser Opaque user data passed on creation. + * @param off Offset to start reading from. + * @param pvBuf Where to store the read data. + * @param cbRead How many bytes to read. + */ +typedef DECLCALLBACK(int) FNDVMREAD(void *pvUser, uint64_t off, void *pvBuf, size_t cbRead); +/** Pointer to a read callback. */ +typedef FNDVMREAD *PFNDVMREAD; + +/** + * Callback to write data to the underlying medium. + * + * @returns IPRT status code. + * @param pvUser Opaque user data passed on creation. + * @param off Offset to start writing to. + * @param pvBuf The data to write. + * @param cbRead How many bytes to write. + */ +typedef DECLCALLBACK(int) FNDVMWRITE(void *pvUser, uint64_t off, const void *pvBuf, size_t cbWrite); +/** Pointer to a read callback. */ +typedef FNDVMWRITE *PFNDVMWRITE; + +/** + * Callback for querying the block allocation status of a volume. + * + * @returns IPRT status code. + * @param pvUser Opaque user data passed when setting the callback. + * @param off Offset relative to the start of the volume. + * @param cb Range to check in bytes. + * @param pfAllocated Where to store the allocation status on success. + */ +typedef DECLCALLBACK(int) FNDVMVOLUMEQUERYBLOCKSTATUS(void *pvUser, uint64_t off, + uint64_t cb, bool *pfAllocated); +/** Pointer to a query block allocation status callback. */ +typedef FNDVMVOLUMEQUERYBLOCKSTATUS *PFNDVMVOLUMEQUERYBLOCKSTATUS; + +/** + * Create a new volume manager. + * + * @returns IPRT status. + * @param phVolMgr Where to store the handle to the volume manager on + * success. + * @param pfnRead Read callback for the underlying + * disk/container/whatever. + * @param pfnWrite Write callback for the underlying + * disk/container/whatever. + * @param cbDisk Size of the underlying disk in bytes. + * @param cbSector Size of one sector in bytes. + * @param fFlags Combination of RTDVM_FLAGS_* + * @param pvUser Opaque user data passed to the callbacks. + */ +RTDECL(int) RTDvmCreate(PRTDVM phVolMgr, PFNDVMREAD pfnRead, + PFNDVMWRITE pfnWrite, uint64_t cbDisk, + uint64_t cbSector, uint32_t fFlags, + void *pvUser); + +/** + * Retain a given volume manager. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVolMgr The volume manager to retain. + */ +RTDECL(uint32_t) RTDvmRetain(RTDVM hVolMgr); + +/** + * Releases a given volume manager. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVolMgr The volume manager to release. + */ +RTDECL(uint32_t) RTDvmRelease(RTDVM hVolMgr); + +/** + * Probes the underyling disk for the best volume manager format handler + * and opens it. + * + * @returns IPRT status code. + * @retval VERR_NOT_FOUND if no backend can handle the volume map on the disk. + * @param hVolMgr The volume manager handle. + */ +RTDECL(int) RTDvmMapOpen(RTDVM hVolMgr); + +/** + * Initializes a new volume map using the given format handler. + * + * @returns IPRT status code. + * @param hVolMgr The volume manager handle. + * @param pszFmt The format to use for the new map. + */ +RTDECL(int) RTDvmMapInitialize(RTDVM hVolMgr, const char *pszFmt); + +/** + * Gets the currently used format of the disk map. + * + * @returns Name of the format. + * @param hVolMgr The volume manager handle. + */ +RTDECL(const char *) RTDvmMapGetFormat(RTDVM hVolMgr); + +/** + * Gets the number of valid partitions in the map. + * + * @returns The number of valid volumes in the map or UINT32_MAX on failure. + * @param hVolMgr The volume manager handle. + */ +RTDECL(uint32_t) RTDvmMapGetValidVolumes(RTDVM hVolMgr); + +/** + * Gets the maximum number of partitions the map can hold. + * + * @returns The maximum number of volumes in the map or UINT32_MAX on failure. + * @param hVolMgr The volume manager handle. + */ +RTDECL(uint32_t) RTDvmMapGetMaxVolumes(RTDVM hVolMgr); + +/** + * Get the first valid volume from a map. + * + * @returns IPRT status code. + * @param hVolMgr The volume manager handle. + * @param phVol Where to store the handle to the first volume on + * success. Release with RTDvmVolumeRelease(). + */ +RTDECL(int) RTDvmMapQueryFirstVolume(RTDVM hVolMgr, PRTDVMVOLUME phVol); + +/** + * Get the first valid volume from a map. + * + * @returns IPRT status code. + * @param hVolMgr The volume manager handle. + * @param hVol Handle of the current volume. + * @param phVolNext Where to store the handle to the next volume on + * success. Release with RTDvmVolumeRelease(). + */ +RTDECL(int) RTDvmMapQueryNextVolume(RTDVM hVolMgr, RTDVMVOLUME hVol, PRTDVMVOLUME phVolNext); + +/** + * Returns whether the given block on the disk is in use. + * + * @returns IPRT status code. + * @param hVolMgr The volume manager handler. + * @param off The start offset to check for. + * @param cb The range in bytes to check. + * @param pfAllocated Where to store the status on success. + * + * @remark This method will return true even if a part of the range is not in use. + */ +RTDECL(int) RTDvmMapQueryBlockStatus(RTDVM hVolMgr, uint64_t off, uint64_t cb, + bool *pfAllocated); + +/** + * Retains a valid volume handle. + * + * @returns New reference count on success, UINT32_MAX on failure. + * @param hVol The volume to retain. + */ +RTDECL(uint32_t) RTDvmVolumeRetain(RTDVMVOLUME hVol); + +/** + * Releases a valid volume handle. + * + * @returns New reference count on success (0 if closed), UINT32_MAX on failure. + * @param hVol The volume to release. + */ +RTDECL(uint32_t) RTDvmVolumeRelease(RTDVMVOLUME hVol); + +/** + * Sets the callback to query the block allocation status for a volume. + * This overwrites any other callback set previously. + * + * @returns nothing. + * @param hVol The volume handle. + * @param pfnQueryBlockStatus The callback to set. Can be NULL to disable + * a previous callback. + * @param pvUser Opaque user data passed in the callback. + */ +RTDECL(void) RTDvmVolumeSetQueryBlockStatusCallback(RTDVMVOLUME hVol, + PFNDVMVOLUMEQUERYBLOCKSTATUS pfnQueryBlockStatus, + void *pvUser); + +/** + * Get the size of a volume in bytes. + * + * @returns Size of the volume in bytes or 0 on failure. + * @param hVol The volume handle. + */ +RTDECL(uint64_t) RTDvmVolumeGetSize(RTDVMVOLUME hVol); + +/** + * Gets the name of the volume if supported. + * + * @returns IPRT status code. + * @param hVol The volume handle. + * @param ppszVolName Where to store the name of the volume on success. + * The string must be freed with RTStrFree(). + */ +RTDECL(int) RTDvmVolumeQueryName(RTDVMVOLUME hVol, char **ppszVolName); + +/** + * Get the volume type of the volume if supported. + * + * @returns The volume type on success, DVMVOLTYPE_INVALID if hVol is invalid. + * @param hVol The volume handle. + */ +RTDECL(RTDVMVOLTYPE) RTDvmVolumeGetType(RTDVMVOLUME hVol); + +/** + * Get the volume flags of the volume if supported. + * + * @returns The volume flags or UINT64_MAX on failure. + * @param hVol The volume handle. + */ +RTDECL(uint64_t) RTDvmVolumeGetFlags(RTDVMVOLUME hVol); + +/** + * Reads data from the given volume. + * + * @returns IPRT status code. + * @param hVol The volume handle. + * @param off Where to start reading from - 0 is the beginning of + * the volume. + * @param pvBuf Where to store the read data. + * @param cbRead How many bytes to read. + */ +RTDECL(int) RTDvmVolumeRead(RTDVMVOLUME hVol, uint64_t off, void *pvBuf, size_t cbRead); + +/** + * Writes data to the given volume. + * + * @returns IPRT status code. + * @param hVol The volume handle. + * @param off Where to start writing to - 0 is the beginning of + * the volume. + * @param pvBuf The data to write. + * @param cbWrite How many bytes to write. + */ +RTDECL(int) RTDvmVolumeWrite(RTDVMVOLUME hVol, uint64_t off, const void *pvBuf, size_t cbWrite); + +/** + * Returns the description of a given volume type. + * + * @returns The description of the type. + * @param enmVolType The volume type. + */ +RTDECL(const char *) RTDvmVolumeTypeGetDescr(RTDVMVOLTYPE enmVolType); + +/** + * Creates an VFS file from a volume handle. + * + * @returns IPRT status code. + * @param hVol The volume handle. + * @param phVfsFileOut Where to store the VFS file handle on success. + */ +RTDECL(int) RTDvmVolumeCreateVfsFile(RTDVMVOLUME hVol, PRTVFSFILE phVfsFileOut); + +RT_C_DECLS_END + +/** @} */ + +#endif + |