/* $Id: ext.h $ */ /** @file * IPRT, Ext2/3/4 format. */ /* * Copyright (C) 2012-2020 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_ext_h #define IPRT_INCLUDED_formats_ext_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include /** @defgroup grp_rt_formats_ext Extended Filesystem (EXT2/3/4) structures and definitions * @ingroup grp_rt_formats * @{ */ /* * The filesystem structures were retrieved from: * https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html */ /** Offset where to find the first superblock on the disk, this is constant. */ #define EXT_SB_OFFSET 1024 /** @name EXT_INODE_NR_XXX - Special inode numbers. * @{ */ #define EXT_INODE_NR_DEF_BLOCKS 1 /**< List of defective blocks. */ #define EXT_INODE_NR_ROOT_DIR 2 /**< Root directory. */ #define EXT_INODE_NR_USER_QUOTA 3 /**< User quota. */ #define EXT_INODE_NR_GROUP_QUOTA 4 /**< Group quota. */ #define EXT_INODE_NR_BOOT_LOADER 5 /**< Boot loader. */ #define EXT_INODE_NR_UNDEL_DIR 6 /**< Undelete directory. */ #define EXT_INODE_NR_RESV_GRP_DESC 7 /**< Reserved group descriptors inode. */ #define EXT_INODE_NR_JOURNAL 8 /**< Journal. */ #define EXT_INODE_NR_EXCLUDE 9 /**< Exclude inode. */ #define EXT_INODE_NR_REPLICA 10 /**< Replica inode. */ /** @} */ /** * Ext superblock. * * Everything is stored little endian on the disk. */ typedef struct EXTSUPERBLOCK { /** 0x00: Total number of inodes in the filesystem. */ uint32_t cInodesTotal; /** 0x04: Total number of blocks in the filesystem (low 32bits). */ uint32_t cBlocksTotalLow; /** 0x08: Number of blocks reserved for the super user (low 32bits). */ uint32_t cBlocksRsvdForSuperUserLow; /** 0x0c: Total number of free blocks (low 32bits). */ uint32_t cBlocksFreeLow; /** 0x10: Total number of free inodes. */ uint32_t cInodesFree; /** 0x14: First data block. */ uint32_t iBlockOfSuperblock; /** 0x18: Block size (calculated as 2^(10 + cBitsShiftLeftBlockSize)). */ uint32_t cLogBlockSize; /** 0x1c: Cluster size (calculated as 2^cLogClusterSize). */ uint32_t cLogClusterSize; /** 0x20: Number of blocks in each block group. */ uint32_t cBlocksPerGroup; /** 0x24: Number of clusters in each block group. */ uint32_t cClustersPerBlockGroup; /** 0x28: Number of inodes for each block group. */ uint32_t cInodesPerBlockGroup; /** 0x2c: Last mount time in seconds since epoch. */ uint32_t u32LastMountTime; /** 0x30: Last written time in seconds since epoch. */ uint32_t u32LastWrittenTime; /** 0x34: Number of times the volume was mounted since the last check. */ uint16_t cMountsSinceLastCheck; /** 0x36: Number of mounts allowed before a consistency check. */ uint16_t cMaxMountsUntilCheck; /** 0x38: Signature to identify a ext2 volume (EXT_SIGNATURE). */ uint16_t u16Signature; /** 0x3a: State of the filesystem (EXT_SB_STATE_XXX) */ uint16_t u16FilesystemState; /** 0x3c: What to do on an error. */ uint16_t u16ActionOnError; /** 0x3e: Minor revision level. */ uint16_t u16RevLvlMinor; /** 0x40: Time of last check in seconds since epoch. */ uint32_t u32LastCheckTime; /** 0x44: Interval between consistency checks in seconds. */ uint32_t u32CheckInterval; /** 0x48: Operating system ID of the filesystem creator (EXT_SB_OS_ID_CREATOR_XXX). */ uint32_t u32OsIdCreator; /** 0x4c: Revision level (EXT_SB_REV_XXX). */ uint32_t u32RevLvl; /** 0x50: User ID that is allowed to use reserved blocks. */ uint16_t u16UidReservedBlocks; /** 0x52: Group ID that is allowed to use reserved blocks. */ uint16_t u16GidReservedBlocks; /** 0x54: First non reserved inode number. */ uint32_t iFirstInodeNonRsvd; /** 0x58: Size of the inode structure in bytes. */ uint16_t cbInode; /** 0x5a: Block group number of this super block. */ uint16_t iBlkGrpSb; /** 0x5c: Compatible feature set flags (EXT_SB_FEAT_COMPAT_XXX). */ uint32_t fFeaturesCompat; /** 0x60: Incompatible feature set (EXT_SB_FEAT_INCOMPAT_XXX). */ uint32_t fFeaturesIncompat; /** 0x64: Readonly-compatible feature set (EXT_SB_FEAT_COMPAT_RO_XXX). */ uint32_t fFeaturesCompatRo; /** 0x68: 128bit UUID for the volume. */ uint8_t au8Uuid[16]; /** 0x78: Volume name. */ char achVolumeName[16]; /** 0x88: Directory were the filesystem was mounted last. */ char achLastMounted[64]; /** 0xc8: Bitmap usage algorithm (used for compression). */ uint32_t u32AlgoUsageBitmap; /** 0xcc: Number of blocks to try to preallocate for files(?). */ uint8_t cBlocksPrealloc; /** 0xcd: Number of blocks to try to preallocate for directories. */ uint8_t cBlocksPreallocDirectory; /** 0xce: Number of reserved group descriptor entries for future filesystem expansion. */ uint16_t cGdtEntriesRsvd; /** 0xd0: 128bit UUID for the journal superblock. */ uint8_t au8JournalUuid[16]; /** 0xe0: Inode number of the journal file. */ uint32_t iJournalInode; /** 0xe4: Device number of journal file (if the appropriate feature flag is set). */ uint32_t u32JournalDev; /** 0xe8: Start of list of orpaned inodes to delete. */ uint32_t u32LastOrphan; /** 0xec: HTREE hash seed. */ uint32_t au32HashSeedHtree[4]; /** 0xfc: Default hash algorithm to use for hashes (EXT_SB_HASH_VERSION_DEF_XXX). */ uint8_t u8HashVersionDef; /** 0xfd: Journal backup type. */ uint8_t u8JnlBackupType; /** 0xfe: Group descriptor size in bytes. */ uint16_t cbGroupDesc; /** 0x100: Default mount options (EXT_SB_MNT_OPTS_DEF_XXX). */ uint32_t fMntOptsDef; /** 0x104: First metablock block group (if feature is enabled). */ uint32_t iFirstMetaBg; /** 0x108: Filesystem creation time in seconds since epoch. */ uint32_t u32TimeFsCreation; /** 0x10c: Backup copy of journals inodes block array for the first elements. */ uint32_t au32JnlBlocks[17]; /** 0x150: Total number of blocks in the filesystem (high 32bits). */ uint32_t cBlocksTotalHigh; /** 0x154: Number of blocks reserved for the super user (high 32bits). */ uint32_t cBlocksRsvdForSuperUserHigh; /** 0x158: Total number of free blocks (high 32bits). */ uint32_t cBlocksFreeHigh; /** 0x15c: All inodes have at least this number of bytes. */ uint16_t cbInodesExtraMin; /** 0x15e: New inodes should reserve this number of bytes. */ uint16_t cbNewInodesRsv; /** 0x160: Miscellaneous flags (EXT_SB_F_XXX). */ uint32_t fFlags; /** 0x164: RAID stride, number of logical blocks read from or written to the disk * before moving to the next disk. */ uint16_t cRaidStride; /** 0x166: Number of seconds between multi-mount prevention checking. */ uint16_t cSecMmpInterval; /** 0x168: Block number for the multi-mount protection data. */ uint64_t iMmpBlock; /** 0x170: Raid stride width. */ uint32_t cRaidStrideWidth; /** 0x174: Size of a flexible block group (calculated as 2^cLogGroupsPerFlex). */ uint8_t cLogGroupsPerFlex; /** 0x175: Metadata checksum algorithm type, only 1 is valid (for CRC32c). */ uint8_t u8ChksumType; /** 0x176: Padding. */ uint16_t u16Padding; /** 0x178: Number of KiB written to the filesystem so far. */ uint64_t cKbWritten; /** 0x180: Inode number of active snapshot. */ uint32_t iSnapshotInode; /** 0x184: Sequential ID of active snapshot. */ uint32_t iSnapshotId; /** 0x188: Number of blocks reserved for activ snapshot's future use. */ uint64_t cSnapshotRsvdBlocks; /** 0x190: Inode number of the head of the on-disk snapshot list. */ uint32_t iSnapshotListInode; /** 0x194: Number of errors seen so far. */ uint32_t cErrorsSeen; /** 0x198: First time an error happened in seconds since epoch. */ uint32_t u32TimeFirstError; /** 0x19c: Inode involved in the first error. */ uint32_t iInodeFirstError; /** 0x1a0: Number of block involved of first error. */ uint64_t iBlkFirstError; /** 0x1a8: Name of the function where the first error happened. */ char achFuncFirstError[32]; /** 0x1c8: Line number where the error happened. */ uint32_t iLineFirstError; /** 0x1cc: Time of the most receent error in seconds since epoch. */ uint32_t u32TimeLastError; /** 0x1d0: Inode involved in the most recent error. */ uint32_t iInodeLastError; /** 0x1d4: Line number where the most recent error happened. */ uint32_t iLineLastError; /** 0x1d8: Number of block involved of most recent error. */ uint64_t iBlkLastError; /** 0x1e0: Name of the function where the most recent error happened. */ char achFuncLastError[32]; /** 0x200: ASCIIz string of mount options. */ char aszMntOpts[64]; /** 0x240: Inode number of user quota file. */ uint32_t iInodeUsrQuota; /** 0x244: Inode number of group quota file. */ uint32_t iInodeGrpQuota; /** 0x248: Overhead blocks/clusters in filesystem. */ uint32_t cOverheadBlocks; /** 0x24c: Block groups containing superblock backups. */ uint32_t aiBlkGrpSbBackups[2]; /** 0x254: Encryption algorithms in use (EXT_SB_ENCRYPT_ALGO_XXX). */ uint8_t au8EncryptAlgo[4]; /** 0x258: Salt for the string2key algorithm for encryption. */ uint8_t abEncryptPwSalt[16]; /** 0x268: Inode number of lost+found. */ uint32_t iInodeLostFound; /** 0x26c: Inode that tracks project quotas. */ uint32_t iInodeProjQuota; /** 0x270: Checksum seed used for the metadata checksum calculations. * Should be crc32c(~0, au8Uuid). */ uint32_t u32ChksumSeed; /** 0x274: Upper 8bits of the u32LastWrittenTime field. */ uint8_t u32LastWrittenTimeHigh8Bits; /** 0x275: Upper 8bits of the u32LastMountTime field. */ uint8_t u32LastMountTimeHigh8Bits; /** 0x276: Upper 8bits of the u32TimeFsCreation field. */ uint8_t u32TimeFsCreationHigh8Bits; /** 0x277: Upper 8bits of the u32LastCheckTime field. */ uint8_t u32LastCheckTimeHigh8Bits; /** 0x278: Upper 8bits of the u32TimeFirstError field. */ uint8_t u32TimeFirstErrorHigh8Bits; /** 0x279: Upper 8bits of the u32TimeLastError field. */ uint8_t u32TimeLastErrorHigh8Bits; /** 0x27a: Zero padding. */ uint8_t au8Padding[2]; /** 0x27c: Padding to the end of the block. */ uint32_t au32Rsvd[96]; /** 0x3fc: Superblock checksum. */ uint32_t u32Chksum; } EXTSUPERBLOCK; AssertCompileMemberOffset(EXTSUPERBLOCK, u16UidReservedBlocks, 0x50); AssertCompileMemberOffset(EXTSUPERBLOCK, u32AlgoUsageBitmap, 0xc8); AssertCompileMemberOffset(EXTSUPERBLOCK, iJournalInode, 0xe0); AssertCompileMemberOffset(EXTSUPERBLOCK, u8HashVersionDef, 0xfc); AssertCompileMemberOffset(EXTSUPERBLOCK, fMntOptsDef, 0x100); AssertCompileMemberOffset(EXTSUPERBLOCK, iBlkLastError, 0x1d8); AssertCompileMemberOffset(EXTSUPERBLOCK, iInodeLostFound, 0x268); AssertCompileSize(EXTSUPERBLOCK, 1024); /** Pointer to an ext super block. */ typedef EXTSUPERBLOCK *PEXTSUPERBLOCK; /** Pointer to a const ext super block. */ typedef EXTSUPERBLOCK const *PCEXTSUPERBLOCK; /** Ext signature. */ #define EXT_SB_SIGNATURE UINT16_C(0xef53) /** @name EXT_SB_STATE_XXX - Filesystem state * @{ */ /** Clean filesystem state. */ #define EXT_SB_STATE_CLEAN UINT16_C(0x0001) /** Error filesystem state. */ #define EXT_SB_STATE_ERRORS UINT16_C(0x0002) /** Orphans being recovered state. */ #define EXT_SB_STATE_ORPHANS_RECOVERING UINT16_C(0x0004) /** @} */ /** @name EXT_SB_OS_ID_CREATOR_XXX - Filesystem creator * @{ */ /** Linux. */ #define EXT_SB_OS_ID_CREATOR_LINUX 0 /** Hurd. */ #define EXT_SB_OS_ID_CREATOR_HURD 1 /** Masix. */ #define EXT_SB_OS_ID_CREATOR_MASIX 2 /** FreeBSD. */ #define EXT_SB_OS_ID_CREATOR_FREEBSD 3 /** Lites. */ #define EXT_SB_OS_ID_CREATOR_LITES 4 /** @} */ /** @name EXT_SB_REV_XXX - Superblock revision * @{ */ /** Original format (ext2). */ #define EXT_SB_REV_ORIG 0 /** Inodes have dynmic sizes. */ #define EXT_SB_REV_V2_DYN_INODE_SZ 1 /** @} */ /** @name EXT_SB_FEAT_COMPAT_XXX - Compatible features which can be ignored when set * and not being supported. * @{ */ /** Directories can be preallocated. */ #define EXT_SB_FEAT_COMPAT_DIR_PREALLOC RT_BIT_32(0) /** Some sort of "imagic" inodes. */ #define EXT_SB_FEAT_COMPAT_IMAGIC_INODES RT_BIT_32(1) /** Filesystem has a journal. */ #define EXT_SB_FEAT_COMPAT_HAS_JOURNAL RT_BIT_32(2) /** Filesystem supports extended attributes. */ #define EXT_SB_FEAT_COMPAT_EXT_ATTR RT_BIT_32(3) /** Filesystem contains reserved group descriptor blocks for filesystem expansion. */ #define EXT_SB_FEAT_COMPAT_RESIZE_INODE RT_BIT_32(4) /** Filesystem contains directory indices. */ #define EXT_SB_FEAT_COMPAT_DIR_INDEX RT_BIT_32(5) /** Lazy block group - not used. */ #define EXT_SB_FEAT_COMPAT_LAZY_BG RT_BIT_32(6) /** Exclude inode - not used. */ #define EXT_SB_FEAT_COMPAT_EXCLUDE_INODE RT_BIT_32(7) /** Exclude bitmap - not used. */ #define EXT_SB_FEAT_COMPAT_EXCLUDE_BITMAP RT_BIT_32(8) /** Sparse super blocks, super block contains pointers to block groups * containing backups of the superblock. */ #define EXT_SB_FEAT_COMPAT_SPARSE_SUPER2 RT_BIT_32(9) /** @} */ /** @name EXT_SB_FEAT_INCOMPAT_XXX - Incompatible features which cause a mounting * error when set and not being supported. * @{ */ /** Filesystem contains compressed files. */ #define EXT_SB_FEAT_INCOMPAT_COMPRESSION RT_BIT_32(0) /** Directory entries contain a file type. */ #define EXT_SB_FEAT_INCOMPAT_DIR_FILETYPE RT_BIT_32(1) /** Filesystem needs recovery. */ #define EXT_SB_FEAT_INCOMPAT_RECOVER RT_BIT_32(2) /** The journal is recorded on a separate device. */ #define EXT_SB_FEAT_INCOMPAT_JOURNAL_DEV RT_BIT_32(3) /** Filesystem uses meta block groups. */ #define EXT_SB_FEAT_INCOMPAT_META_BG RT_BIT_32(4) /** Files in the filesystem use extents. */ #define EXT_SB_FEAT_INCOMPAT_EXTENTS RT_BIT_32(6) /** Filesystem uses 64bit offsets. */ #define EXT_SB_FEAT_INCOMPAT_64BIT RT_BIT_32(7) /** Filesystem requires multiple mount preotection. */ #define EXT_SB_FEAT_INCOMPAT_MMP RT_BIT_32(8) /** Filesystem uses flexible block groups. */ #define EXT_SB_FEAT_INCOMPAT_FLEX_BG RT_BIT_32(9) /** Inodes can be used to store large extended attribute values. */ #define EXT_SB_FEAT_INCOMPAT_EXT_ATTR_INODE RT_BIT_32(10) /** Data is contained in directory entries. */ #define EXT_SB_FEAT_INCOMPAT_DIRDATA RT_BIT_32(12) /** Metadata checksum seed is stored in the super block. */ #define EXT_SB_FEAT_INCOMPAT_CSUM_SEED RT_BIT_32(13) /** Directories can be larger than 2GiB or contain a 3-level HTree. */ #define EXT_SB_FEAT_INCOMPAT_LARGE_DIR RT_BIT_32(14) /** Data is inlined in the inode. */ #define EXT_SB_FEAT_INCOMPAT_INLINE_DATA RT_BIT_32(15) /** Encrypted inodes are present on the filesystem. */ #define EXT_SB_FEAT_INCOMPAT_ENCRYPT RT_BIT_32(16) /** @} */ /** @name EXT_SB_FEAT_COMPAT_RO_XXX - Backward compatible features when mounted readonly * @{ */ /** Sparse superblocks. */ #define EXT_SB_FEAT_COMPAT_RO_SPARSE_SUPER RT_BIT_32(0) /** There is at least one large file (> 2GiB). */ #define EXT_SB_FEAT_COMPAT_RO_LARGE_FILE RT_BIT_32(1) /** Actually not used in the Linux kernel and e2fprogs. */ #define EXT_SB_FEAT_COMPAT_RO_BTREE_DIR RT_BIT_32(2) /** Filesystem contains files which sizes are not represented as a multiple of 512 byte sectors * but logical blocks instead. */ #define EXT_SB_FEAT_COMPAT_RO_HUGE_FILE RT_BIT_32(3) /** Group descriptors have checksums embedded */ #define EXT_SB_FEAT_COMPAT_RO_GDT_CHSKUM RT_BIT_32(4) /** Subdirectory limit of 32000 doesn't apply. The link count is set to 1 if beyond 64999. */ #define EXT_SB_FEAT_COMPAT_RO_DIR_NLINK RT_BIT_32(5) /** Inodes can contain extra data. */ #define EXT_SB_FEAT_COMPAT_RO_EXTRA_INODE_SZ RT_BIT_32(6) /** There is at least one snapshot on the filesystem. */ #define EXT_SB_FEAT_COMPAT_RO_HAS_SNAPSHOTS RT_BIT_32(7) /** Quotas are enabled for this filesystem. */ #define EXT_SB_FEAT_COMPAT_RO_QUOTA RT_BIT_32(8) /** The bigalloc feature is enabled, file extents are tracked in units of clusters * instead of blocks. */ #define EXT_SB_FEAT_COMPAT_RO_BIGALLOC RT_BIT_32(9) /** Metadata contains checksums. */ #define EXT_SB_FEAT_COMPAT_RO_METADATA_CHKSUM RT_BIT_32(10) /** Filesystem supports replicas. */ #define EXT_SB_FEAT_COMPAT_RO_REPLICA RT_BIT_32(11) /** Filesystem is readonly. */ #define EXT_SB_FEAT_COMPAT_RO_READONLY RT_BIT_32(12) /** Filesystem tracks project quotas. */ #define EXT_SB_FEAT_COMPAT_RO_PROJECT RT_BIT_32(13) /** @} */ /** @name EXT_SB_HASH_VERSION_DEF_XXX - Default hash algorithm used * @{ */ /** Legacy. */ #define EXT_SB_HASH_VERSION_DEF_LEGACY 0 /** Half MD4. */ #define EXT_SB_HASH_VERSION_DEF_HALF_MD4 1 /** Tea. */ #define EXT_SB_HASH_VERSION_DEF_TEA 2 /** Unsigned legacy. */ #define EXT_SB_HASH_VERSION_DEF_LEGACY_UNSIGNED 3 /** Unsigned half MD4. */ #define EXT_SB_HASH_VERSION_DEF_HALF_MD4_UNSIGNED 4 /** Unsigned tea. */ #define EXT_SB_HASH_VERSION_DEF_TEA_UNSIGNED 5 /** @} */ /** @name EXT_SB_MNT_OPTS_DEF_XXX - Default mount options * @{ */ /** Print debugging information on (re)mount. */ #define EXT_SB_MNT_OPTS_DEF_DEBUG RT_BIT_32(0) /** Created files take the group ID ofthe containing directory. */ #define EXT_SB_MNT_OPTS_DEF_BSDGROUPS RT_BIT_32(1) /** Support userspace extended attributes. */ #define EXT_SB_MNT_OPTS_DEF_XATTR_USER RT_BIT_32(2) /** Support POSIX access control lists. */ #define EXT_SB_MNT_OPTS_DEF_ACL RT_BIT_32(3) /** Do not support 32bit UIDs. */ #define EXT_SB_MNT_OPTS_DEF_UID16 RT_BIT_32(4) /** All data and metadata are committed to the journal. */ #define EXT_SB_MNT_OPTS_DEF_JMODE_DATA RT_BIT_32(5) /** All data are flushed to the disk before metadata are committed to the journal. */ #define EXT_SB_MNT_OPTS_DEF_JMODE_ORDERED RT_BIT_32(6) /** Data ordering not preserved, data may be written after metadata has been written. */ #define EXT_SB_MNT_OPTS_DEF_JMODE_WBACK (EXT_SB_MNT_OPTS_DEF_JMODE_DATA | EXT_SB_MNT_OPTS_DEF_JMODE_ORDERED) /** No write flushes. */ #define EXT_SB_MNT_OPTS_DEF_NOBARRIER RT_BIT_32(8) /** Track metadata blocks on the filesystem not being used as data blocks. */ #define EXT_SB_MNT_OPTS_DEF_BLOCK_VALIDITY RT_BIT_32(9) /** Enables TRIM/DISCARD support. */ #define EXT_SB_MNT_OPTS_DEF_DISCARD RT_BIT_32(10) /** Disable delayed allocation. */ #define EXT_SB_MNT_OPTS_DEF_NODELALLOC RT_BIT_32(11) /** @} */ /** @name EXT_SB_F_XXX - Superblock flags * @{ */ /** Signed directory hash used. */ #define EXT_SB_F_SIGNED_DIR_HASH RT_BIT_32(0) /** Unsigned directory hash used. */ #define EXT_SB_F_UNSIGNED_DIR_HASH RT_BIT_32(1) /** Only used to test development code. */ #define EXT_SB_F_DEV_CODE RT_BIT_32(3) /** @} */ /** @name EXT_SB_ENCRYPT_ALGO_XXX - Group descriptor flags * @{ */ /** Invalid encryption algorithm. */ #define EXT_SB_ENCRYPT_ALGO_INVALID 0 /** 256-bit AES in XTS mode. */ #define EXT_SB_ENCRYPT_ALGO_256BIT_AES_XTS 1 /** 256-bit AES in GCM mode. */ #define EXT_SB_ENCRYPT_ALGO_256BIT_AES_GCM 2 /** 256-bit AES in CBC mode. */ #define EXT_SB_ENCRYPT_ALGO_256BIT_AES_CBC 3 /** @} */ /** * Block group descriptor (32byte version). */ typedef struct EXTBLOCKGROUPDESC32 { /** 0x00: Block address of the block bitmap (low 32bits). */ uint32_t offBlockBitmapLow; /** 0x04: Block address of the inode bitmap (low 32bits). */ uint32_t offInodeBitmapLow; /** 0x08: Start block address of the inode table (low 32bits). */ uint32_t offInodeTableLow; /** 0x0c: Number of unallocated blocks in group (low 16bits). */ uint16_t cBlocksFreeLow; /** 0x0e: Number of unallocated inodes in group (low 16bits). */ uint16_t cInodesFreeLow; /** 0x10: Number of directories in the group (low 16bits). */ uint16_t cDirectoriesLow; /** 0x12: Flags (EXT_GROUP_DESC_F_XXX). */ uint16_t fFlags; /** 0x14: Location of snapshot exclusion bitmap (lower 32bits) */ uint32_t offSnapshotExclBitmapLow; /** 0x18: Block bitmap checksum (lower 16bits). */ uint16_t u16ChksumBlockBitmapLow; /** 0x1a: Inode bitmap checksum (lower 16bits). */ uint16_t u16ChksumInodeBitmapLow; /** 0x1c: Unused inode entry count in the groups inode table (lower 16bits).*/ uint16_t cInodeTblUnusedLow; /** 0x1e: Group descriptor checksum. */ uint16_t u16Chksum; } EXTBLOCKGROUPDESC32; AssertCompileSize(EXTBLOCKGROUPDESC32, 32); /** Pointer to an ext block group descriptor. */ typedef EXTBLOCKGROUPDESC32 *PEXTBLOCKGROUPDESC32; /** Pointer to a const 32 byte block group descriptor. */ typedef const EXTBLOCKGROUPDESC32 *PCEXTBLOCKGROUPDESC32; /** * Block group descriptor (64byte version). */ typedef struct EXTBLOCKGROUPDESC64 { /** 0x00: Embedded 32 byte descriptor. */ EXTBLOCKGROUPDESC32 v32; /** 0x20: Location of block bitmap (upper 32bits). */ uint32_t offBlockBitmapHigh; /** 0x24: Location of inode bitmap (upper 32bits). */ uint32_t offInodeBitmapHigh; /** 0x28: Location of inode table (upper 32bits). */ uint32_t offInodeTableHigh; /** 0x2c: Number of unallocated blocks (upper 16bits). */ uint16_t cBlocksFreeHigh; /** 0x2e: Number of unallocated inodes (upper 16bits). */ uint16_t cInodesFreeHigh; /** 0x30: Number of directories in the group (upper 16bits). */ uint16_t cDirectoriesHigh; /** 0x32: Unused inode entry count in the groups inode table (upper 16bits).*/ uint16_t cInodeTblUnusedHigh; /** 0x34: Location of snapshot exclusion bitmap (upper 32bits) */ uint32_t offSnapshotExclBitmapHigh; /** 0x38: Block bitmap checksum (upper 16bits). */ uint16_t u16ChksumBlockBitmapHigh; /** 0x3a: Inode bitmap checksum (upper 16bits). */ uint16_t u16ChksumInodeBitmapHigh; /** 0x3c: Padding to 64 bytes. */ uint32_t u64Padding; } EXTBLOCKGROUPDESC64; AssertCompileSize(EXTBLOCKGROUPDESC64, 64); /** Pointer to an ext block group descriptor. */ typedef EXTBLOCKGROUPDESC64 *PEXTBLOCKGROUPDESC64; /** Pointer to a const 64 byte block group descriptor. */ typedef const EXTBLOCKGROUPDESC64 *PCEXTBLOCKGROUPDESC64; /** @name EXT_GROUP_DESC_F_XXX - Group descriptor flags * @{ */ /** Inode table and bitmaps are not initialized. */ #define EXT_GROUP_DESC_F_INODE_UNINIT RT_BIT(0) /** Block bitmap is not initialized. */ #define EXT_GROUP_DESC_F_BLOCK_UNINIT RT_BIT(1) /** Inode table is zeroed. */ #define EXT_GROUP_DESC_F_INODE_ZEROED RT_BIT(2) /** @} */ /** * Combiend view of the different block gorup descriptor versions. */ typedef union EXTBLOCKGROUPDESC { /** 32 byte version. */ EXTBLOCKGROUPDESC32 v32; /** 64 byte version. */ EXTBLOCKGROUPDESC64 v64; /** Byte view. */ uint8_t au8[64]; } EXTBLOCKGROUPDESC; /** Poiner to a unified block gorup descriptor view. */ typedef EXTBLOCKGROUPDESC *PEXTBLOCKGROUPDESC; /** Poiner to a const unified block gorup descriptor view. */ typedef const EXTBLOCKGROUPDESC *PCEXTBLOCKGROUPDESC; /** Number of block entries in the inodes block map. */ #define EXT_INODE_BLOCK_ENTRIES 15 /** * Inode table entry (standard 128 byte version). */ typedef struct EXTINODE { /** 0x00: File mode (EXT_INODE_FILE_MODE_XXX). */ uint16_t fMode; /** 0x02: Owner UID (lower 16bits). */ uint16_t uUidLow; /** 0x04: Size in bytes (lower 32bits). */ uint32_t cbSizeLow; /** 0x08: Last access time in seconds since epoch. */ uint32_t u32TimeLastAccess; /** 0x0c: Last inode change time in seconds since epoch. */ uint32_t u32TimeLastChange; /** 0x10: Last data modification time in seconds since epoch. */ uint32_t u32TimeLastModification; /** 0x14: Deletion time in seconds since epoch. */ uint32_t u32TimeDeletion; /** 0x18: Group ID (lower 16bits). */ uint16_t uGidLow; /** 0x1a: Hard link count. */ uint16_t cHardLinks; /** 0x1c: Block count (lower 32bits). */ uint32_t cBlocksLow; /** 0x20: Inode flags. */ uint32_t fFlags; /** 0x24: Operating system dependent data. */ union { /** Linux: Inode version. */ uint32_t u32LnxVersion; } Osd1; /** 0x28: Block map or extent tree. */ uint32_t au32Block[EXT_INODE_BLOCK_ENTRIES]; /** 0x64: File version. */ uint32_t u32Version; /** 0x68: Extended attribute control block (lower 32bits). */ uint32_t offExtAttrLow; /** 0x6c: File/directory size (upper 32bits). */ uint32_t cbSizeHigh; /** 0x70: Fragment address (obsolete). */ uint32_t u32FragmentAddrObs; /** 0x74: Operating system dependent data 2. */ union { /** Linux related data. */ struct { /** 0x00: Block count (upper 16bits). */ uint16_t cBlocksHigh; /** 0x02: Extended attribute block location (upper 16bits). */ uint16_t offExtAttrHigh; /** 0x04: Owner UID (upper 16bits). */ uint16_t uUidHigh; /** 0x06: Group ID (upper 16bits). */ uint16_t uGidHigh; /** 0x08: Inode checksum (lower 16bits). */ uint16_t u16ChksumLow; /** 0x0a: Reserved */ uint16_t u16Rsvd; } Lnx; } Osd2; } EXTINODE; AssertCompileSize(EXTINODE, 128); /** Pointer to an inode. */ typedef EXTINODE *PEXTINODE; /** Pointer to a const inode. */ typedef const EXTINODE *PCEXTINODE; /** * Extra inode data (coming right behind the fixed inode data). */ typedef struct EXTINODEEXTRA { /** 0x80: Size of the extra inode data in bytes. */ uint16_t cbInodeExtra; /** 0x82: Inode checksum (upper 16bits.) */ uint16_t u16ChksumHigh; /** 0x84: Last inode change time, extra time bits for sub-second precision. */ uint32_t u32ExtraTimeLastChange; /** 0x88: Last data modification time, extra time bits for sub-second precision. */ uint32_t u32ExtraTimeLastModification; /** 0x8c: Last access time, extra time bits for sub-second precision. */ uint32_t u32ExtraTimeLastAccess; /** 0x90: File creation time in seconds since epoch. */ uint32_t u32TimeCreation; /** 0x94: File creation time, extra time bits for sub-second precision. */ uint32_t u32ExtraTimeCreation; /** 0x98: Version number (upper 32bits). */ uint32_t u32VersionHigh; /** 0x9c: Project ID. */ uint32_t u32ProjectId; } EXTINODEEXTRA; /** Pointer to extra inode data. */ typedef EXTINODEEXTRA *PEXTINODEEXTRA; /** Pointer to a const extra inode data. */ typedef const EXTINODEEXTRA *PCEXTINODEEXTRA; /** * Combined inode data. */ typedef struct EXTINODECOMB { /** Core inode structure. */ EXTINODE Core; /** Any extra inode data which might be present. */ EXTINODEEXTRA Extra; } EXTINODECOMB; /** Pointer to combined inode data. */ typedef EXTINODECOMB *PEXTINODECOMB; /** Pointer to a const combined inode data. */ typedef const EXTINODECOMB *PCEXTINODECOMB; /** @name EXT_INODE_MODE_XXX - File mode * @{ */ /** Others can execute the file. */ #define EXT_INODE_MODE_EXEC_OTHER RT_BIT(0) /** Others can write to the file. */ #define EXT_INODE_MODE_WRITE_OTHER RT_BIT(1) /** Others can read the file. */ #define EXT_INODE_MODE_READ_OTHER RT_BIT(2) /** Members of the same group can execute the file. */ #define EXT_INODE_MODE_EXEC_GROUP RT_BIT(3) /** Members of the same group can write to the file. */ #define EXT_INODE_MODE_WRITE_GROUP RT_BIT(4) /** Members of the same group can read the file. */ #define EXT_INODE_MODE_READ_GROUP RT_BIT(5) /** Owner can execute the file. */ #define EXT_INODE_MODE_EXEC_OWNER RT_BIT(6) /** Owner can write to the file. */ #define EXT_INODE_MODE_WRITE_OWNER RT_BIT(7) /** Owner can read the file. */ #define EXT_INODE_MODE_READ_OWNER RT_BIT(8) /** Sticky file mode. */ #define EXT_INODE_MODE_STICKY RT_BIT(9) /** File is set GID. */ #define EXT_INODE_MODE_SET_GROUP_ID RT_BIT(10) /** File is set UID. */ #define EXT_INODE_MODE_SET_USER_ID RT_BIT(11) /** @} */ /** @name EXT_INODE_MODE_TYPE_XXX - File type * @{ */ /** Inode represents a FIFO. */ #define EXT_INODE_MODE_TYPE_FIFO UINT16_C(0x1000) /** Inode represents a character device. */ #define EXT_INODE_MODE_TYPE_CHAR UINT16_C(0x2000) /** Inode represents a directory. */ #define EXT_INODE_MODE_TYPE_DIR UINT16_C(0x4000) /** Inode represents a block device. */ #define EXT_INODE_MODE_TYPE_BLOCK UINT16_C(0x6000) /** Inode represents a regular file. */ #define EXT_INODE_MODE_TYPE_REGULAR UINT16_C(0x8000) /** Inode represents a symlink. */ #define EXT_INODE_MODE_TYPE_SYMLINK UINT16_C(0xa000) /** Inode represents a socket. */ #define EXT_INODE_MODE_TYPE_SOCKET UINT16_C(0xc000) /** Returns the inode type from the combined mode field. */ #define EXT_INODE_MODE_TYPE_GET_TYPE(a_Mode) ((a_Mode) & 0xf000) /** @} */ /** @name EXT_INODE_F_XXX - Inode flags * @{ */ /** Inode requires secure erase on deletion. */ #define EXT_INODE_F_SECURE_ERASE RT_BIT_32(0) /** Inode should be preserved for undeletion during deletion. */ #define EXT_INODE_F_UNDELETE RT_BIT_32(1) /** Inode contains compressed data. */ #define EXT_INODE_F_COMPRESSED RT_BIT_32(2) /** All writes to this inode must be synchronous. */ #define EXT_INODE_F_SYNCHRONOUS RT_BIT_32(3) /** Inode is immutable. */ #define EXT_INODE_F_IMMUTABLE RT_BIT_32(4) /** Inode is append only. */ #define EXT_INODE_F_APPEND_ONLY RT_BIT_32(5) /** Inode should not be dumped via dump(1). */ #define EXT_INODE_F_NO_DUMP RT_BIT_32(6) /** Access time is not updated. */ #define EXT_INODE_F_NO_ACCESS_TIME RT_BIT_32(7) /** Dirty compressed file. */ #define EXT_INODE_F_DIRTY_COMPRESSED RT_BIT_32(8) /** Inode has one or more compressed clusters. */ #define EXT_INODE_F_COMPRESSED_BLOCK RT_BIT_32(9) /** Inode should not be compressed. */ #define EXT_INODE_F_NO_COMPRESSION RT_BIT_32(10) /** Inode is encrypted. */ #define EXT_INODE_F_ENCRYPTED RT_BIT_32(11) /** Directory has hashed indexes. */ #define EXT_INODE_F_DIR_HASHED_INDEX RT_BIT_32(12) /** AFS magic directory. */ #define EXT_INODE_F_IMAGIC RT_BIT_32(13) /** Data must always be written through the journal. */ #define EXT_INODE_F_JOURNAL_DATA RT_BIT_32(14) /** File tail should not be merged. */ #define EXT_INODE_F_NOTAIL RT_BIT_32(15) /** All directory entry data should be written synchronously. */ #define EXT_INODE_F_DIR_SYNCHRONOUS RT_BIT_32(16) /** Top of directory hierarchy. */ #define EXT_INODE_F_TOP_DIRECTORY RT_BIT_32(17) /** Inode is a huge file. */ #define EXT_INODE_F_HUGE_FILE RT_BIT_32(18) /** Inode uses extents. */ #define EXT_INODE_F_EXTENTS RT_BIT_32(19) /** Inode stores a large extended attribute value in its data blocks. */ #define EXT_INODE_F_EXT_ATTR_INODE RT_BIT_32(20) /** File has blocks allocated past end of file. */ #define EXT_INODE_F_ALLOC_BLOCKS_EOF RT_BIT_32(21) /** Inode is a snapshot. */ #define EXT_INODE_F_SNAPSHOT RT_BIT_32(22) /** Snapshot is being deleted. */ #define EXT_INODE_F_SNAPSHOT_DELETED RT_BIT_32(23) /** Snapshot shrink has completed. */ #define EXT_INODE_F_SNAPSHOT_SHRUNK RT_BIT_32(24) /** Inode contains inline data. */ #define EXT_INODE_F_INLINE_DATA RT_BIT_32(25) /** Children are created with the same project ID. */ #define EXT_INODE_F_PROJECT_ID_INHERIT RT_BIT_32(26) /** Reserved for ext4 library. */ #define EXT_INODE_F_RESERVED_LIBRARY RT_BIT_32(27) /** @} */ /** * Extent tree header. */ typedef struct EXTEXTENTHDR { /** 0x00: Magic number for identification. */ uint16_t u16Magic; /** 0x02: Number of valid entries following. */ uint16_t cEntries; /** 0x04: Maxmimum number of entries that could follow. */ uint16_t cMax; /** 0x06: Depth of this extent node in the tree. */ uint16_t uDepth; /** 0x08: Generation of the tree (not used by standard ext4). */ uint32_t cGeneration; } EXTEXTENTHDR; AssertCompileSize(EXTEXTENTHDR, 12); /** Pointer to a extent tree header. */ typedef EXTEXTENTHDR *PEXTEXTENTHDR; /** Pointer to a const extent tree header. */ typedef const EXTEXTENTHDR *PCEXTEXTENTHDR; /** Magic number identifying an extent header. */ #define EXT_EXTENT_HDR_MAGIC UINT16_C(0xf30a) /** Maximum depth an extent header can have. */ #define EXT_EXTENT_HDR_DEPTH_MAX UINT16_C(5) /** * Extent tree index node. */ typedef struct EXTEXTENTIDX { /** 0x00: Start file block this node covers. */ uint32_t iBlock; /** 0x04: Block number of child extent node (lower 32bits). */ uint32_t offChildLow; /** 0x08: Block number of child extent node (upper 16bits). */ uint16_t offChildHigh; /** 0x0a: Reserved. */ uint16_t u16Rsvd; } EXTEXTENTIDX; AssertCompileSize(EXTEXTENTIDX, 12); /** Pointer to an extent tree index node. */ typedef EXTEXTENTIDX *PEXTEXTENTIDX; /** Pointer to a const extent tree index node. */ typedef const EXTEXTENTIDX *PCEXTEXTENTIDX; /** * Extent tree leaf node. */ typedef struct EXTEXTENT { /** 0x00: First file block number this extent covers. */ uint32_t iBlock; /** 0x04: Number of blocks covered by this extent. */ uint16_t cBlocks; /** 0x06: Block number this extent points to (upper 32bits). */ uint16_t offStartHigh; /** 0x08: Block number this extent points to (lower 32bits). */ uint32_t offStartLow; } EXTEXTENT; AssertCompileSize(EXTEXTENT, 12); /** Pointer to a leaf node. */ typedef EXTEXTENT *PEXTEXTENT; /** Pointer to a const leaf node. */ typedef const EXTEXTENT *PCEXTEXTENT; /** Length field limit for a populated extent, fields greater than that limit indicate a sparse extent. */ #define EXT_EXTENT_LENGTH_LIMIT UINT16_C(32768) /** * Directory entry. */ typedef struct EXTDIRENTRY { /** 0x00: Inode number being referenced by this entry. */ uint32_t iInodeRef; /** 0x04: Record length of this directory entry in bytes (multiple of 4). */ uint16_t cbRecord; /** 0x06: Version dependent data. */ union { /** Original. */ struct { /** Name length in bytes (maximum 255). */ uint16_t cbName; } v1; /** Version 2. */ struct { /** Name length in bytes (maximum 255). */ uint8_t cbName; /** File type (EXT_DIRENTRY_TYPE_XXX). */ uint8_t uType; } v2; } u; /** 0x08: File name - variable in size. */ char achName[1]; } EXTDIRENTRY; /** Pointer to a directory entry. */ typedef EXTDIRENTRY *PEXTDIRENTRY; /** Poiner to a const directory entry. */ typedef const EXTDIRENTRY *PCEXTDIRENTRY; /** * Extended directory entry with the maximum size (263 bytes). */ #pragma pack(1) typedef union EXTDIRENTRYEX { /** The directory entry. */ EXTDIRENTRY Core; /** The byte view. */ uint8_t au8[263]; } EXTDIRENTRYEX; #pragma pack() AssertCompileSize(EXTDIRENTRYEX, 263); /** Pointer to an extended directory entry. */ typedef EXTDIRENTRYEX *PEXTDIRENTRYEX; /** Pointer to a const extended directory entry. */ typedef const EXTDIRENTRYEX *PCEXTDIRENTRYEX; /** @name EXT_DIRENTRY_TYPE_XXX - file type * @{ */ /** Entry is of unknown file type. */ #define EXT_DIRENTRY_TYPE_UNKNOWN 0 /** Entry is regular file. */ #define EXT_DIRENTRY_TYPE_REGULAR 1 /** Entry is another directory. */ #define EXT_DIRENTRY_TYPE_DIRECTORY 2 /** Entry is a character device. */ #define EXT_DIRENTRY_TYPE_CHAR 3 /** Entry is a block device. */ #define EXT_DIRENTRY_TYPE_BLOCK 4 /** Entry is a FIFO. */ #define EXT_DIRENTRY_TYPE_FIFO 5 /** Entry is a socket. */ #define EXT_DIRENTRY_TYPE_SOCKET 6 /** Entry is a symlink. */ #define EXT_DIRENTRY_TYPE_SYMLINK 7 /** Entry is a checksum and uses EXTDIRENTRYCHKSUM. */ #define EXT_DIRENTRY_TYPE_CHKSUM 0xde /** @} */ /** * Tail directory entry (for checksumming). */ typedef struct EXTDIRENTRYCHKSUM { /** 0x00: Reserved, must be 0 (overlays with EXTDIRENTRY::iNodeRef). */ uint32_t u32Rsvd; /** 0x04: Record length (must be 12). */ uint16_t cbRecord; /** 0x06: Reserved (overlays with EXTDIRENTRY::u::v1::cbName). */ uint8_t u8Rsvd; /** 0x07: File type (must be 0xde). */ uint8_t uType; /** 0x08: Checksum. */ uint32_t u32Chksum; } EXTDIRENTRYCHKSUM; /** Pointer to a tail directory entry. */ typedef EXTDIRENTRYCHKSUM *PEXTDIRENTRYCHKSUM; /** Pointer to const tail directory entry. */ typedef const EXTDIRENTRYCHKSUM *PCEXTDIRENTRYCHKSUM; /** @} */ #endif /* !IPRT_INCLUDED_formats_ext_h */