/* $Id: xfs.h $ */ /** @file * IPRT, XFS format. */ /* * Copyright (C) 2018-2019 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_xfs_h #define IPRT_INCLUDED_formats_xfs_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include /** @defgroup grp_rt_formats_xfs XFS filesystem structures and definitions * @ingroup grp_rt_formats * @{ */ /* * The filesystem structures were retrieved from: * http://xfs.org/docs/xfsdocs-xml-dev/XFS_Filesystem_Structure//tmp/en-US/html/index.html and * https://elixir.bootlin.com/linux/v4.9/source/fs/xfs/libxfs/xfs_format.h and * https://righteousit.wordpress.com/ */ /** XFS superblock offset from the beginning of the volume, this is constant. */ #define XFS_SB_OFFSET UINT64_C(0) /** @name Common XFS types as defined in the spec. * @{ */ /** Unsigned 64 bit absolute inode number. */ typedef uint64_t XFSINO; /** Signed 64 bit file offset. */ typedef int64_t XFSFOFF; /** Signed 64 bit disk address. */ typedef int64_t XFSDADDR; /** Unsinged 32 bit allocation group (AG) number. */ typedef uint32_t XFSAGNUMBER; /** Unsigned 32 bit AG relative block number. */ typedef uint32_t XFSAGBLOCK; /** Unsigned 32 bit extent length in blocks. */ typedef uint32_t XFSEXTLEN; /** Signed 32 bit number of extents in a file. */ typedef int32_t XFSEXTNUM; /** Unsigned 32 bit block number for directories and extended attributes. */ typedef uint32_t XFSDABLK; /** Unsigned 32 bit hash of a directory file name or extended attribute name. */ typedef uint32_t XFSDAHASH; /** Unsigned 64 bit filesystem block number combining AG number and block offset into the AG. */ typedef uint64_t XFSDFSBNO; /** Unsigned 64 bit raw filesystem block number. */ typedef uint64_t XFSDRFSBNO; /** Unsigned 64 bit extent number in the real-time device. */ typedef uint64_t XFSDRTBNO; /** Unsigned 64 bit block offset int oa file. */ typedef uint64_t XFSDFILOFF; /** Unsigned 64 bit block count for a file. */ typedef uint64_t XFSDFILBLKS; /** @} */ /** * XFS superblock. */ #pragma pack(1) typedef struct XFSSUPERBLOCK { /** 0x00: Magic number to identify the superblock. */ uint32_t u32Magic; /** 0x04: Size of smallest allocation unit in bytes. */ uint32_t cbBlock; /** 0x04: Number of blocks available for data and metadata. */ XFSDRFSBNO cBlocks; /** 0x0c: Number of block in the real-time device. */ XFSDRFSBNO cBlocksRtDev; /** 0x14: Number of extents on real-time device. */ XFSDRTBNO cExtentsRtDev; /** 0x1c: UUID of the filesystem. */ uint8_t abUuid[16]; /** 0x2c: First block of the filesystem journal. */ XFSDFSBNO uBlockJournal; /** 0x34: Inode number of the root directory. */ XFSINO uInodeRoot; /** Inode for the real-time extent bitmap. */ XFSINO uInodeBitmapRtExt; /** Inode for the real-time bitmap summary. */ XFSINO uInodeBitmapSummary; /** Extent size on the real-time device in blocks. */ XFSAGBLOCK cRtExtent; /** Size of an AG in blocks. */ XFSAGBLOCK cAgBlocks; /** Number of AGs in hte filesystem. */ XFSAGNUMBER cAg; /** Number of real-time bitmap blocks. */ XFSEXTLEN cRtBitmapBlocks; /** Number of blocks for the journal. */ XFSEXTLEN cJournalBlocks; /** Version number (actually flag bitmaps of features). */ uint16_t fVersion; /** Sector size of the underlying medium. */ uint16_t cbSector; /** Size of an inode in bytes. */ uint16_t cbInode; /** Number of inodes stored in one block. */ uint16_t cInodesPerBlock; /** Name of the filesystem. */ char achFsName[12]; /** Block size as log2 (number of bits to shift left). */ uint8_t cBlockSzLog; /** Sector size as log2 (number of bits to shift left). */ uint8_t cSectorSzLog; /** Inode size as log2 (number of bits to shift left). */ uint8_t cInodeSzLog; /** Number of inodes per block as log2. */ uint8_t cInodesPerBlockLog; /** Number of AG blocks as log2 (number of bits to shift left). */ uint8_t cAgBlocksLog; /** Number of extent blocks as log2. */ uint8_t cExtentsRtDevLog; /** Flag when the filesystem is in the process of being created. */ uint8_t fInProgress; /** Maximum percentage of the filesystem usable for inodes. */ uint8_t cInodeMaxPct; /** Global number of inodes allocated (only mainted on the first superblock). */ uint64_t cInodesGlobal; /** Global number of free inodes (only mainted on the first superblock). */ uint64_t cInodesGlobalFree; /** Global count of free data blocks on the filesystem (only mainted on the first superblock). */ uint64_t cBlocksFree; /** Global count of free extents on the real-time device (only mainted on the first superblock). */ uint64_t cExtentsRtFree; /** Inode containing the user quotas. */ XFSINO uInodeQuotaUsr; /** Inode containing the group/project quotas. */ XFSINO uInodeQuotaGrp; /** Quota flags. */ uint16_t fQuotaFlags; /** Misc flags. */ uint8_t fFlagsMisc; /** Reserved MBZ. */ uint8_t uSharedVn; /** Number of filesystem blocks for the inode chunk alignment. */ XFSEXTLEN cBlocksInodeAlignment; /** Raid stripe size in blocks. */ uint32_t cBlocksRaidStripe; /** Raid width in number of blocks. */ uint32_t cBlocksRaidWidth; /** Multiplier for determining the allocation size for directory blocks as log2. */ uint8_t cDirBlockAllocLog; /** Sub volume sector size as log2 if an external journal device is used. */ uint8_t cLogDevSubVolSectorSzLog; /** Sector size of the device an external journal is stored as log2. */ uint16_t cLogDevSectorSzLog; /** Log devices stripe size. */ uint32_t cLogDevRaidStripe; /** Additional features which may be active. */ uint32_t fFeatures2; /** Padding. */ uint32_t u32Padding0; /** From here follow data only available from version 5 and later. */ /** Read/Write feature flags. */ uint32_t fFeaturesRw; /** Read-only feature flags. */ uint32_t fFeaturesRo; /** Read/Write incompatible feature flags. */ uint32_t fFeaturesIncompatRw; /** Read/Write incompatible feature flags for the journal. */ uint32_t fFeaturesJrnlIncompatRw; /** CRC32 checksum for the superblock. */ uint32_t u32Chksum; /** Sparse inode alignment. */ uint32_t u32SparseInodeAlignment; /** Project quota inode. */ XFSINO uInodeProjectQuota; /** Log sequence number of last superblock update. */ uint64_t uJrnlSeqSbUpdate; /** UUID used when INCOMPAT_META_UUID is used. */ uint8_t abUuidMeta[16]; /** Inode if INCOMPATMETA_RMAPBT is used. */ XFSINO uInodeRm; } XFSSUPERBLOCK; #pragma pack() AssertCompileSize(XFSSUPERBLOCK, 272); /** Pointer to an XFS superblock. */ typedef XFSSUPERBLOCK *PXFSSUPERBLOCK; /** Pointer to a const XFS superblock. */ typedef const XFSSUPERBLOCK *PCXFSSUPERBLOCK; /** XFS superblock magic. */ #define XFS_SB_MAGIC RT_MAKE_U32_FROM_U8('B', 'S', 'F', 'X') /** @name XFS_SB_VERSION_F_XXX - Version/Feature flags. * @{ */ /** Retrieves the version part of the field. */ #define XFS_SB_VERSION_GET(a_fVersion) ((a_fVersion) & 0xf) /** Version number for filesystem 5.3, 6.0.1 and 6.1. */ #define XFS_SB_VERSION_1 1 /** Version number for filesystem 6.2 - attributes. */ #define XFS_SB_VERSION_2 2 /** Version number for filesystem 6.2 - new inode version. */ #define XFS_SB_VERSION_3 3 /** Version number for filesystem 6.2+ - new bitmask version. */ #define XFS_SB_VERSION_4 4 /** Introduced checksums in the metadata. */ #define XFS_SB_VERSION_5 5 /** Extended attributes are used for at least one inode. */ #define XFS_SB_VERSION_F_ATTR RT_BIT_32(4) /** At least one inode use 32-bit nlink values. */ #define XFS_SB_VERSION_F_NLINK RT_BIT_32(5) /** Quotas are enabled on the filesystem. */ #define XFS_SB_VERSION_F_QUOTA RT_BIT_32(6) /** Set if XFSSUPERBLOCK::cBlocksInodeAlignment is used. */ #define XFS_SB_VERSION_F_ALIGN RT_BIT_32(7) /** Set if XFSSUPERBLOCK::cBlocksRaidStripe and XFSSUPERBLOCK::cBlocksRaidWidth are used. */ #define XFS_SB_VERSION_F_DALIGN RT_BIT_32(8) /** Set if XFSSUPERBLOCK::uSharedVn is used. */ #define XFS_SB_VERSION_F_SHARED RT_BIT_32(9) /** Version 2 journaling is used. */ #define XFS_SB_VERSION_F_LOGV2 RT_BIT_32(10) /** Set if sector size is not 512 bytes. */ #define XFS_SB_VERSION_F_SECTOR RT_BIT_32(11) /** Set if unwritten extents are used (always set). */ #define XFS_SB_VERSION_F_EXTFLG RT_BIT_32(12) /** Version 2 directories are used (always set). */ #define XFS_SB_VERSION_F_DIRV2 RT_BIT_32(13) /** Set if XFSSUPERBLOCK::fFeatures2 is used. */ #define XFS_SB_VERSION_F_FEAT2 RT_BIT_32(14) /** @} */ /** @name XFS_SB_QUOTA_F_XXX - Quota flags * @{ */ /** User quota accounting enabled. */ #define XFS_SB_QUOTA_F_USR_ACCT RT_BIT(0) /** User quotas are enforced. */ #define XFS_SB_QUOTA_F_USR_ENFD RT_BIT(1) /** User quotas have been checked and updated on disk. */ #define XFS_SB_QUOTA_F_USR_CHKD RT_BIT(2) /** Project quota accounting is enabled. */ #define XFS_SB_QUOTA_F_PROJ_ACCT RT_BIT(3) /** Other quotas are enforced. */ #define XFS_SB_QUOTA_F_OTH_ENFD RT_BIT(4) /** Other quotas have been checked and updated on disk. */ #define XFS_SB_QUOTA_F_OTH_CHKD RT_BIT(5) /** Group quota accounting enabled. */ #define XFS_SB_QUOTA_F_GRP_ACCT RT_BIT(6) /** @} */ /** @name XFS_SB_FEATURES2_F_XXX - Additional features * @{ */ /** Global counters are lazy and are only updated when the filesystem is cleanly unmounted. */ #define XFS_SB_FEATURES2_F_LAZYSBCOUNT RT_BIT_32(1) /** Extended attributes version 2. */ #define XFS_SB_FEATURES2_F_ATTR2 RT_BIT_32(3) /** Parent pointers, inodes must have an extended attribute pointing to the parent inode. */ #define XFS_SB_FEATURES2_F_PARENT RT_BIT_32(4) /** @} */ /** * XFS AG free space block. */ typedef struct XFSAGF { /** Magic number. */ uint32_t u32Magic; /** Header version number. */ uint32_t uVersion; /** AG number for the sector. */ uint32_t uSeqNo; /** Length of the AG in filesystem blocks. */ uint32_t cLengthBlocks; /** Block numbers for the roots of the free space B+trees. */ uint32_t auRoots[3]; /** Depths of the free space B+trees. */ uint32_t acLvls[3]; /** Index of the first free list block. */ uint32_t idxFreeListFirst; /** Index of the last free list block. */ uint32_t idxFreeListLast; /** Number of blocks in the free list. */ uint32_t cFreeListBlocks; /** Current number of free blocks in the AG. */ uint32_t cFreeBlocks; /** Longest number of contiguous free blocks in the AG. */ uint32_t cFreeBlocksLongest; /** Number of blocks used for the free space B+-trees. */ uint32_t cBlocksBTrees; /** UUID of filesystem the AG belongs to. */ uint8_t abUuid[16]; /** Number of blocks used for the reverse map. */ uint32_t cBlocksRevMap; /** Number of blocks used for the refcount B+-tree. */ uint32_t cBlocksRefcountBTree; /** Block number for the refcount tree root. */ uint32_t uRootRefcount; /** Depth of the refcount B+-tree. */ uint32_t cLvlRefcount; /** Reserved contiguous space for future extensions. */ uint64_t au64Rsvd[14]; /** Last write sequence number. */ uint64_t uSeqNoLastWrite; /** CRC of the AGF. */ uint32_t uChkSum; /** Padding to 64 bit alignment. */ uint32_t uAlignment0; } XFSAGF; /** Pointer to a AG free space block. */ typedef XFSAGF *PXFSAGF; /** Poiner to a const AG free space block. */ typedef const XFSAGF *PCXFSAGF; /** AGF magic. */ #define XFS_AGF_MAGIC RT_MAKE_U32_FROM_U8('F', 'G', 'A', 'X') /** The current valid AGF version. */ #define XFS_AGF_VERSION 1 /** * XFS AG inode information. */ typedef struct XFSAGI { /** Magic number. */ uint32_t u32Magic; /** Header version number. */ uint32_t uVersion; /** AG number for the sector. */ uint32_t uSeqNo; /** Length of the AG in filesystem blocks. */ uint32_t cLengthBlocks; /** Count of allocated inodes. */ uint32_t cInodesAlloc; /** Block number of the inode tree root. */ uint32_t uRootInode; /** Depth of the inode B+-tree. */ uint32_t cLvlsInode; /** Newest allocated inode. */ uint32_t uInodeNew; /** Last directory inode chunk. */ uint32_t uInodeDir; /** Hash table of unlinked but still referenced inodes. */ uint32_t au32HashUnlinked[64]; /** UUID of filesystem. */ uint8_t abUuid[16]; /** CRC of the AGI. */ uint32_t uChkSum; /** Padding. */ uint32_t uAlignment0; /** Last write sequence number. */ uint64_t uSeqNoLastWrite; /** Block number of the free inode tree. */ uint32_t uRootFreeInode; /** Depth of the free inode B+-tree. */ uint32_t cLvlsFreeInode; } XFSAGI; /** Pointer to a AG inode information. */ typedef XFSAGI *PXFSAGI; /** Pointer to a const AG inode information. */ typedef const XFSAGI *PCXFSAGI; /** AGI magic. */ #define XFS_AGI_MAGIC RT_MAKE_U32_FROM_U8('I', 'G', 'A', 'X') /** The current valid AGI version. */ #define XFS_AGI_VERSION 1 /** * XFS timestamp structure. */ typedef struct XFSTIMESTAMP { /** 0x00: The second part of the timestamp since the epoch. */ int32_t cSecEpoch; /** 0x04: Nanosecond part of the timestamp. */ int32_t cNanoSec; } XFSTIMESTAMP; /** Pointer to a XFS timestamp. */ typedef XFSTIMESTAMP *PXFSTIMESTAMP; /** Poiner to a const CFS timestamp. */ typedef const XFSTIMESTAMP *PCXFSTIMESTAMP; /** * The inode core structure. */ typedef struct XFSINODECORE { /** 0x00: Magic value. */ uint16_t u16Magic; /** 0x02: File mode and access bits (XFS_INODE_MODE_XXX). */ uint16_t fMode; /** 0x04: Inode version. */ int8_t iVersion; /** 0x05: The format of the data fork. */ int8_t enmFormat; /** 0x06: Number of links to this inode from directories for v1 inodes. */ uint16_t cOnLinks; /** 0x08: Owners UID. */ uint32_t uUid; /** 0x0c: Owners GID. */ uint32_t uGid; /** 0x10: The number of links to this inode for v2 inodes. */ uint32_t cLinks; /** 0x14: Project ID for v2 inodes (not used for v1, low 16bits). */ uint16_t uProjIdLow; /** 0x16: Project ID for v2 inodes (not used for v1, high 16bits). */ uint16_t uProjIdHigh; /** 0x18: Padding. */ uint8_t abPad0[6]; /** 0x1e: Flush counter. */ uint16_t cFlush; /** 0x20: Last accessed timestamp. */ XFSTIMESTAMP TsLastAccessed; /** 0x28: Last modified timestamp. */ XFSTIMESTAMP TsLastModified; /** 0x30: Inode created/modified timestamp. */ XFSTIMESTAMP TsCreatedModified; /** 0x38: Number of bytes in the file. */ uint64_t cbInode; /** 0x40: Number of direct and B-Tree blocks used for the forks. */ uint64_t cBlocks; /** 0x48: Minimum exten size for the inode. */ uint32_t cExtentBlocksMin; /** 0x4c: Number of extents in the data fork. */ uint32_t cExtentsData; /** 0x50: Number of extents in the attribute fork. */ uint16_t cExtentsAttr; /** 0x52: Offset of the attribute fork from the start of the inode. */ uint8_t offAttrFork; /** 0x53: Attribute fork format. */ int8_t enmFormatAttr; /** 0x54: DMIG event mask. */ uint32_t fEvtMaskDmig; /** 0x58: DMIG state info. */ uint16_t uStateDmig; /** 0x5a: Inode flags. */ uint16_t fFlags; /** 0x5c: Generation number. */ uint32_t cGeneration; /** 0x60: AGI unlinked list pointer. */ uint32_t offBlockUnlinkedNext; /** The following fields are for v3 inodes only. */ /** 0x64: The CRC of the inode. */ uint32_t uChkSum; /** 0x68: Number of attribute changes. */ uint64_t cAttrChanges; /** 0x70: Last flush sequence number. */ uint64_t uFlushSeqNo; /** 0x78: Additional flags. */ uint64_t fFlags2; /** 0x80: Basic COW extent size. */ uint32_t cExtentCowMin; /** 0x84: Padding for future expansion. */ uint8_t abPad1[12]; /** 0x90: Inode creation timestamp. */ XFSTIMESTAMP TsCreation; /** 0x98: The inode number. */ uint64_t uInode; /** 0x100: Filesystem UUID the inode belongs to. */ uint8_t abUuid[16]; } XFSINODECORE; AssertCompileSizeAlignment(XFSINODECORE, 8); /** Pointer to a inode core. */ typedef XFSINODECORE *PXFSINODECORE; /** Pointer to a const inode core. */ typedef const XFSINODECORE *PCXFSINODECORE; /** Inode magic. */ #define XFS_INODE_MAGIC RT_MAKE_U16_FROM_U8('N', 'I') /** @name XFS_INODE_MODE_XXX - File mode * @{ */ /** Others can execute the file. */ #define XFS_INODE_MODE_EXEC_OTHER RT_BIT(0) /** Others can write to the file. */ #define XFS_INODE_MODE_WRITE_OTHER RT_BIT(1) /** Others can read the file. */ #define XFS_INODE_MODE_READ_OTHER RT_BIT(2) /** Members of the same group can execute the file. */ #define XFS_INODE_MODE_EXEC_GROUP RT_BIT(3) /** Members of the same group can write to the file. */ #define XFS_INODE_MODE_WRITE_GROUP RT_BIT(4) /** Members of the same group can read the file. */ #define XFS_INODE_MODE_READ_GROUP RT_BIT(5) /** Owner can execute the file. */ #define XFS_INODE_MODE_EXEC_OWNER RT_BIT(6) /** Owner can write to the file. */ #define XFS_INODE_MODE_WRITE_OWNER RT_BIT(7) /** Owner can read the file. */ #define XFS_INODE_MODE_READ_OWNER RT_BIT(8) /** Sticky file mode. */ #define XFS_INODE_MODE_STICKY RT_BIT(9) /** File is set GID. */ #define XFS_INODE_MODE_SET_GROUP_ID RT_BIT(10) /** File is set UID. */ #define XFS_INODE_MODE_SET_USER_ID RT_BIT(11) /** @} */ /** @name XFS_INODE_MODE_TYPE_XXX - File type * @{ */ /** Inode represents a FIFO. */ #define XFS_INODE_MODE_TYPE_FIFO UINT16_C(0x1000) /** Inode represents a character device. */ #define XFS_INODE_MODE_TYPE_CHAR UINT16_C(0x2000) /** Inode represents a directory. */ #define XFS_INODE_MODE_TYPE_DIR UINT16_C(0x4000) /** Inode represents a block device. */ #define XFS_INODE_MODE_TYPE_BLOCK UINT16_C(0x6000) /** Inode represents a regular file. */ #define XFS_INODE_MODE_TYPE_REGULAR UINT16_C(0x8000) /** Inode represents a symlink. */ #define XFS_INODE_MODE_TYPE_SYMLINK UINT16_C(0xa000) /** Inode represents a socket. */ #define XFS_INODE_MODE_TYPE_SOCKET UINT16_C(0xc000) /** Returns the inode type from the combined mode field. */ #define XFS_INODE_MODE_TYPE_GET_TYPE(a_Mode) ((a_Mode) & 0xf000) /** @} */ /** @name XFS_INODE_FORMAT_XXX - Inode data fork format. * @{ */ /** Device node data. */ #define XFS_INODE_FORMAT_DEV 0 /** Inline data. */ #define XFS_INODE_FORMAT_LOCAL 1 /** Array of extent descriptors. */ #define XFS_INODE_FORMAT_EXTENTS 2 /** Data fork contains root of B-Tree. */ #define XFS_INODE_FORMAT_BTREE 3 /** Data fork contains UUID. */ #define XFS_INODE_FORMAT_UUID 4 /** @} */ /** @name XFS_INODE_F_XXX - Inode flags. * @{ */ /** File data blocks are stored in the real-time device area. */ #define XFS_INODE_F_RTDEV RT_BIT(0) /** File space has been pre-allocated. */ #define XFS_INODE_F_PREALLOC RT_BIT(1) /** Use new real-time bitmap format. */ #define XFS_INODE_F_NEWRTBITMAP RT_BIT(2) /** Inode is immutable. */ #define XFS_INODE_F_IMMUTABLE RT_BIT(3) /** Inode is append only. */ #define XFS_INODE_F_APPEND RT_BIT(4) /** Inode is written synchronously. */ #define XFS_INODE_F_SYNC RT_BIT(5) /** The last accessed timestamp is not updated. */ #define XFS_INODE_F_NOATIME RT_BIT(6) /** The inode is not dumpable via dump(1). */ #define XFS_INODE_F_NODUMP RT_BIT(7) /** Create with real-time bit set. */ #define XFS_INODE_F_RTINHERIT RT_BIT(8) /** Create with parents project ID. */ #define XFS_INODE_F_PROJIDINHERIT RT_BIT(9) /** Deny symlink creation. */ #define XFS_INODE_F_NOSYMLINKS RT_BIT(10) /** Inode extent size allocator hint. */ #define XFS_INODE_F_EXTSIZEHINT RT_BIT(11) /** Inode extent size is inherited. */ #define XFS_INODE_F_EXTSIZEINHERIT RT_BIT(12) /** Do not defrag/reorganize the inode. */ #define XFS_INODE_F_NODEFRAG RT_BIT(13) /** Use filestream allocator. */ #define XFS_INODE_F_FILESTREAM RT_BIT(14) /** @} */ /** @name XFS_INODE_F2_XXX - Inode flags number 2 (XFSINODECORE::fFlags2). * @{ */ /** Use DAX for the inode. */ #define XFS_INODE_F2_DAX RT_BIT_64(0) /** Blocks use reference counting for sharing. */ #define XFS_INODE_F2_REFLINK RT_BIT_64(1) /** Inode COW extent size hint is valid. */ #define XFS_INODE_F2_COWEXTSIZEHINT RT_BIT_64(2) /** @} */ /** * Inode B-Tree record. */ typedef struct XFSINODEBTREEREC { /** 0x00: Starting inode number. */ uint32_t uInodeStart; /** 0x04: Version dependent data. */ union { /** Full (old) version. */ struct { /** 0x04: Number of free inodes. */ uint32_t cInodesFree; } Full; /** Sparse (new) version. */ struct { /** 0x04: Hole mask for sparse chunks. */ uint16_t bmHoles; /** 0x06: Total number of inodes. */ uint8_t cInodes; /** 0x07: Number of free inodes. */ uint8_t cInodesFree; } Sparse; } u; /** 0x08: Free inode mask. */ uint64_t bmInodesFree; } XFSINODEBTREEREC; /** Pointer to an inode B-Tree record. */ typedef XFSINODEBTREEREC *PXFSINODEBTREEREC; /** Pointer to a const inode B-Tree record. */ typedef const XFSINODEBTREEREC *PCXFSINODEBTREEREC; /** @} */ #endif /* !IPRT_INCLUDED_formats_xfs_h */