/* $Id: apfs.h 93115 2022-01-01 11:31:46Z vboxsync $ */ /** @file * IPRT, APFS (Apple File System) format. */ /* * Copyright (C) 2019-2022 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_INCLUDED_formats_apfs_h #define IPRT_INCLUDED_formats_apfs_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include /** @defgroup grp_rt_formats_apfs Apple File System structures and definitions * @ingroup grp_rt_formats * @{ */ /* * The filesystem structures were retrieved from: * https://developer.apple.com/support/downloads/Apple-File-System-Reference.pdf */ /** Physical address of an on-disk block. */ typedef int64_t APFSPADDR; /** Object identifier. */ typedef uint64_t APFSOID; /** Transaction identifier. */ typedef uint64_t APFSXID; /** Invalid object ID. */ #define APFS_OID_INVALID UINT64_C(0) /** Number of reserved object IDs for special structures. */ #define APFS_OID_RSVD_CNT 1024 /** Object ID of a super block. */ #define APFS_OID_NX_SUPERBLOCK UINT64_C(1) /** * Range of physical addresses. */ typedef struct { /** Start address of the range. */ APFSPADDR PAddrStart; /** Size of the range in blocks.*/ uint64_t cBlocks; } APFSPRANGE; /** Pointer to a APFS range. */ typedef APFSPRANGE *PAPFSPRANGE; /** Pointer to a const APFS range. */ typedef const APFSPRANGE *PCAPFSPRANGE; /** APFS UUID (compatible with our UUID definition). */ typedef RTUUID APFSUUID; /** Maximum object checksum size. */ #define APFS_OBJ_MAX_CHKSUM_SZ 8 /** * APFS Object header. */ typedef struct APFSOBJPHYS { /** The stored checksum of the object. */ uint8_t abChkSum[APFS_OBJ_MAX_CHKSUM_SZ]; /** Object ID. */ APFSOID Oid; /** Transaction ID. */ APFSXID Xid; /** Object type. */ uint32_t u32Type; /** Object sub type. */ uint32_t u32SubType; } APFSOBJPHYS; /** Pointer to an APFS object header. */ typedef APFSOBJPHYS *PAPFSOBJPHYS; /** Pointer to a const APFS object header. */ typedef const APFSOBJPHYS *PCAPFSOBJPHYS; #define APFS_OBJECT_TYPE_MASK UINT32_C(0x0000ffff) #define APFS_OBJECT_TYPE_FLAGS_MASK UINT32_C(0xffff0000) /** * APFS EFI jumpstart information. */ typedef struct APFSEFIJMPSTART { /** Object header. */ APFSOBJPHYS ObjHdr; /** The magic value. */ uint32_t u32Magic; /** The version of the structure. */ uint32_t u32Version; /** EFI file length in bytes. */ uint32_t cbEfiFile; /** Number of extents describing the on disk blocks the file is stored in. */ uint32_t cExtents; /** Reserved. */ uint64_t au64Rsvd0[16]; /** After this comes a variable size of APFSPRANGE extent structures. */ } APFSEFIJMPSTART; /** Pointer to an APFS EFI jumpstart structure. */ typedef APFSEFIJMPSTART *PAPFSEFIJMPSTART; /** Pointer to a const APFS EFI jumpstart structure. */ typedef const APFSEFIJMPSTART *PCAPFSEFIJMPSTART; /** EFI jumpstart magic ('RDSJ'). */ #define APFS_EFIJMPSTART_MAGIC RT_MAKE_U32_FROM_U8('J', 'S', 'D', 'R') /** EFI jumpstart version. */ #define APFS_EFIJMPSTART_VERSION UINT32_C(1) /** Maximum number of filesystems supported in a single container. */ #define APFS_NX_SUPERBLOCK_FS_MAX UINT32_C(100) /** Maximum number of counters in the superblock. */ #define APFS_NX_SUPERBLOCK_COUNTERS_MAX UINT32_C(32) /** Number of entries in the ephemeral information array. */ #define APFS_NX_SUPERBLOCK_EPH_INFO_COUNT UINT32_C(4) /** * APFS super block. */ typedef struct { /** Object header. */ APFSOBJPHYS ObjHdr; /** The magic value. */ uint32_t u32Magic; /** Block size in bytes. */ uint32_t cbBlock; /** Number of blocks in the volume. */ uint64_t cBlocks; /** Feature flags of the volume. */ uint64_t fFeatures; /** Readonly compatible features. */ uint64_t fRdOnlyCompatFeatures; /** Incompatible features. */ uint64_t fIncompatFeatures; /** UUID of the volume. */ APFSUUID Uuid; /** Next free object identifier to use for new objects. */ APFSOID OidNext; /** Next free transaction identifier to use for new transactions. */ APFSOID XidNext; /** Number of blocks used by the checkpoint descriptor area. */ uint32_t cXpDescBlocks; /** Number of blocks used by the checkpoint data area. */ uint32_t cXpDataBlocks; /** Base address of checkpoint descriptor area. */ APFSPADDR PAddrXpDescBase; /** Base address of checkpoint data area. */ APFSPADDR PAddrXpDataBase; /** Next index to use in the checkpoint descriptor area. */ uint32_t idxXpDescNext; /** Next index to use in the checkpoint data area. */ uint32_t idxXpDataNext; /** Number of blocks in the checkpoint descriptor area used by the checkpoint that this superblock belongs to. */ uint32_t cXpDescLen; /** Index of the first valid item in the checkpoint data area. */ uint32_t idxXpDataFirst; /** Number of blocks in the checkpoint data area used by the checkpoint that this superblock belongs to. */ uint32_t cXpDataLen; /** Ephemeral object identifer of the space manager. */ APFSOID OidSpaceMgr; /** Physical object identifier for the containers object map. */ APFSOID OidOMap; /** Ephemeral object identifer for the reaper. */ APFSOID OidReaper; /** Reserved for testing should be always zero on disk. */ uint32_t u32TestType; /** Maximum number of filesystems which can be stored in this container. */ uint32_t cFsMax; /** Array of filesystem object identifiers. */ APFSOID aFsOids[APFS_NX_SUPERBLOCK_FS_MAX]; /** Array of counters primarily used during debugging. */ uint64_t aCounters[APFS_NX_SUPERBLOCK_COUNTERS_MAX]; /** Range of blocks where no space will be allocated, used for shrinking a partition. */ APFSPRANGE RangeBlocked; /** Physical object identifier of a tree keeping track of objects needing to be moved out of the block range. */ APFSOID OidTreeEvictMapping; /** Container flags. */ uint64_t fFlags; /** Address of the EFI jumpstart structure. */ APFSPADDR PAddrEfiJmpStart; /** UUID of the containers Fusion set if available. */ APFSUUID UuidFusion; /** Address of the containers keybag. */ APFSPADDR PAddrKeyLocker; /** Array of fields used in the management of ephemeral data. */ uint64_t au64EphemeralInfo[APFS_NX_SUPERBLOCK_EPH_INFO_COUNT]; /** Reserved for testing. */ APFSOID OidTest; /** Physical object identifier of the Fusion middle tree. */ APFSOID OidFusionMt; /** Ephemeral object identifier of the Fusion write-back cache state. */ APFSOID OidFusionWbc; /** Blocks used for the Fusion write-back cache area. */ APFSPRANGE RangeFusionWbc; } APFSNXSUPERBLOCK; /** Pointer to a APFS super block structure. */ typedef APFSNXSUPERBLOCK *PAPFSNXSUPERBLOCK; /** Pointer to a const APFS super block structure. */ typedef const APFSNXSUPERBLOCK *PCAPFSNXSUPERBLOCK; /** Superblock magic value ('BSXN'). */ #define APFS_NX_SUPERBLOCK_MAGIC RT_MAKE_U32_FROM_U8('N', 'X', 'S', 'B') /** @} */ #endif /* !IPRT_INCLUDED_formats_apfs_h */