/** @file * IPRT Disk Volume Management API (DVM). */ /* * Copyright (C) 2011-2016 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 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