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Diffstat (limited to 'include/iprt/formats/ext.h')
| -rw-r--r-- | include/iprt/formats/ext.h | 988 |
1 files changed, 988 insertions, 0 deletions
diff --git a/include/iprt/formats/ext.h b/include/iprt/formats/ext.h new file mode 100644 index 00000000..068012cd --- /dev/null +++ b/include/iprt/formats/ext.h @@ -0,0 +1,988 @@ +/* $Id: ext.h $ */ +/** @file + * IPRT, Ext2/3/4 format. + */ + +/* + * Copyright (C) 2012-2019 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 <iprt/types.h> +#include <iprt/assertcompile.h> + + +/** @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 */ + |