mirror of
https://github.com/KolibriOS/kolibrios.git
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529 lines
19 KiB
PHP
529 lines
19 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2013-2015. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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; from stat.h
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; distinguish file types
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S_IFMT = 0170000o ; These bits determine file type.
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S_IFDIR = 0040000o ; Directory.
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S_IFCHR = 0020000o ; Character device.
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S_IFBLK = 0060000o ; Block device.
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S_IFREG = 0100000o ; Regular file.
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S_IFIFO = 0010000o ; FIFO.
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S_IFLNK = 0120000o ; Symbolic link.
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S_IFSOCK = 0140000o ; Socket.
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; end stat.h
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; XFS null constant: empty fields must be all ones, not zeros!
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XFS_NULL = -1
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; static sector numbers
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XFS_SECT_SB = 0
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XFS_SECT_AGF = 1
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XFS_SECT_AGI = 2
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XFS_SECT_AGFL = 3
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; signatures of file system structures
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; 'string' numbers are treated by fasm as big endian
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XFS_SB_MAGIC = 'XFSB'
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XFS_AGF_MAGIC = 'XAGF'
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XFS_AGI_MAGIC = 'XAGI'
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XFS_ABTB_MAGIC = 'ABTB'
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XFS_ABTC_MAGIC = 'ABTC'
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XFS_IBT_MAGIC = 'IABT'
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XFS_DINODE_MAGIC = 'IN'
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XFS_BMAP_MAGIC = 'BMAP'
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XFS_DA_NODE_MAGIC = 0xbefe ; those are little endian here
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XFS_ATTR_LEAF_MAGIC = 0xeefb ; but big endian in docs
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XFS_DIR2_LEAF1_MAGIC = 0xf1d2 ; pay attention!
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XFS_DIR2_LEAFN_MAGIC = 0xffd2 ;
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XFS_DIR2_BLOCK_MAGIC = 'XD2B'
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XFS_DIR2_DATA_MAGIC = 'XD2D'
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XFS_DIR2_FREE_MAGIC = 'XD2F'
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XFS_DQUOT_MAGIC = 'DQ'
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; bitfield lengths for packed extent
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; MSB to LSB / left to right
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BMBT_EXNTFLAG_BITLEN = 1
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BMBT_STARTOFF_BITLEN = 54
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BMBT_STARTBLOCK_BITLEN = 52
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BMBT_BLOCKCOUNT_BITLEN = 21
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; those constants are taken from linux source (xfs_dir2_leaf.h)
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; they are magic infile offsets for directories
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XFS_DIR2_DATA_ALIGN_LOG = 3 ; i.e., 8 bytes
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XFS_DIR2_LEAF_SPACE = 1
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XFS_DIR2_SPACE_SIZE = (1 SHL (32 + XFS_DIR2_DATA_ALIGN_LOG))
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XFS_DIR2_LEAF_OFFSET = (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE)
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XFS_DIR2_FREE_SPACE = 2
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XFS_DIR2_SPACE_SIZE = (1 SHL (32 + XFS_DIR2_DATA_ALIGN_LOG))
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XFS_DIR2_FREE_OFFSET = (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE)
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; data section magic constants for directories (xfs_dir2_data.h)
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XFS_DIR2_DATA_FD_COUNT = 3
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XFS_DIR2_DATA_FREE_TAG = 0xffff
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; valid inode formats
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; enum xfs_dinode_fmt (xfs_dinode.h)
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XFS_DINODE_FMT_DEV = 0 ; xfs_dev_t
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XFS_DINODE_FMT_LOCAL = 1 ; one inode is enough (shortdir)
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XFS_DINODE_FMT_EXTENTS = 2 ; one or more extents (leafdir, nodedir, regular files)
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XFS_DINODE_FMT_BTREE = 3 ; highly fragmented files or really huge directories
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XFS_DINODE_FMT_UUID = 4 ; uuid_t
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; size of the unlinked inode hash table in the agi
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XFS_AGI_UNLINKED_BUCKETS = 64
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; possible extent states
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; enum xfs_exntst_t (xfs_bmap_btree.h)
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XFS_EXT_NORM = 0
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XFS_EXT_UNWRITTEN = 1
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XFS_EXT_DMAPI_OFFLINE = 2
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XFS_EXT_INVALID = 3
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; values for inode core flags / di_flags (xfs_dinode.h)
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XFS_DIFLAG_REALTIME_BIT = 0 ; file's blocks come from rt area
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XFS_DIFLAG_PREALLOC_BIT = 1 ; file space has been preallocated
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XFS_DIFLAG_NEWRTBM_BIT = 2 ; for rtbitmap inode, new format
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XFS_DIFLAG_IMMUTABLE_BIT = 3 ; inode is immutable
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XFS_DIFLAG_APPEND_BIT = 4 ; inode is append-only
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XFS_DIFLAG_SYNC_BIT = 5 ; inode is written synchronously
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XFS_DIFLAG_NOATIME_BIT = 6 ; do not update atime
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XFS_DIFLAG_NODUMP_BIT = 7 ; do not dump
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XFS_DIFLAG_RTINHERIT_BIT = 8 ; create with realtime bit set
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XFS_DIFLAG_PROJINHERIT_BIT = 9 ; create with parents projid
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XFS_DIFLAG_NOSYMLINKS_BIT = 10 ; disallow symlink creation
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XFS_DIFLAG_EXTSIZE_BIT = 11 ; inode extent size allocator hint
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XFS_DIFLAG_EXTSZINHERIT_BIT = 12 ; inherit inode extent size
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XFS_DIFLAG_NODEFRAG_BIT = 13 ; do not reorganize/defragment
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XFS_DIFLAG_FILESTREAM_BIT = 14 ; use filestream allocator
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XFS_DIFLAG_REALTIME = (1 SHL XFS_DIFLAG_REALTIME_BIT)
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XFS_DIFLAG_PREALLOC = (1 SHL XFS_DIFLAG_PREALLOC_BIT)
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XFS_DIFLAG_NEWRTBM = (1 SHL XFS_DIFLAG_NEWRTBM_BIT)
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XFS_DIFLAG_IMMUTABLE = (1 SHL XFS_DIFLAG_IMMUTABLE_BIT)
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XFS_DIFLAG_APPEND = (1 SHL XFS_DIFLAG_APPEND_BIT)
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XFS_DIFLAG_SYNC = (1 SHL XFS_DIFLAG_SYNC_BIT)
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XFS_DIFLAG_NOATIME = (1 SHL XFS_DIFLAG_NOATIME_BIT)
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XFS_DIFLAG_NODUMP = (1 SHL XFS_DIFLAG_NODUMP_BIT)
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XFS_DIFLAG_RTINHERIT = (1 SHL XFS_DIFLAG_RTINHERIT_BIT)
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XFS_DIFLAG_PROJINHERIT = (1 SHL XFS_DIFLAG_PROJINHERIT_BIT)
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XFS_DIFLAG_NOSYMLINKS = (1 SHL XFS_DIFLAG_NOSYMLINKS_BIT)
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XFS_DIFLAG_EXTSIZE = (1 SHL XFS_DIFLAG_EXTSIZE_BIT)
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XFS_DIFLAG_EXTSZINHERIT = (1 SHL XFS_DIFLAG_EXTSZINHERIT_BIT)
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XFS_DIFLAG_NODEFRAG = (1 SHL XFS_DIFLAG_NODEFRAG_BIT)
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XFS_DIFLAG_FILESTREAM = (1 SHL XFS_DIFLAG_FILESTREAM_BIT)
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; superblock _ondisk_ structure (xfs_sb.h)
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; this is _not_ the partition structure
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; for XFS partition structure see XFS below
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struct xfs_sb
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sb_magicnum dd ? ; signature, must be XFS_SB_MAGIC
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sb_blocksize dd ? ; block is the minimal file system unit, in bytes
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sb_dblocks dq ? ; number of data blocks
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sb_rblocks dq ? ; number of realtime blocks (not supported yet!)
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sb_rextents dq ? ; number of realtime extents (not supported yet!)
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sb_uuid rb 16 ; file system unique identifier
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sb_logstart dq ? ; starting block of log (for internal journal; journals on separate devices are not supported!)
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sb_rootino dq ? ; root inode number
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sb_rbmino dq ? ; bitmap inode for realtime extents (ignored)
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sb_rsumino dq ? ; summary inode for rt bitmap (ignored)
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sb_rextsize dd ? ; realtime extent size, blocks
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sb_agblocks dd ? ; size of an allocation group (the last one may be smaller!)
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sb_agcount dd ? ; number of allocation groups
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sb_rbmblocks dd ? ; number of rt bitmap blocks
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sb_logblocks dd ? ; number of log blocks
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sb_versionnum dw ? ; header version == XFS_SB_VERSION
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sb_sectsize dw ? ; volume sector size in bytes (only 512B sectors are supported)
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sb_inodesize dw ? ; inode size, bytes
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sb_inopblock dw ? ; inodes per block
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sb_fname rb 12 ; inodes per block (aka label)
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sb_blocklog db ? ; log2 of sb_blocksize
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sb_sectlog db ? ; log2 of sb_blocksize
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sb_inodelog db ? ; log2 of sb_inodesize
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sb_inopblog db ? ; log2 of sb_inopblock
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sb_agblklog db ? ; log2 of sb_agblocks (rounded up!)
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sb_rextslog db ? ; log2 of sb_rextents
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sb_inprogress db ? ; mkfs is in progress, don't mount
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sb_imax_pct db ? ; max % of fs for inode space
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; statistics
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sb_icount dq ? ; allocated inodes
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sb_ifree dq ? ; free inodes
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sb_fdblocks dq ? ; free data blocks
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sb_frextents dq ? ; free realtime extents
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sb_uquotino dq ? ; user quota inode
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sb_gquotino dq ? ; group quota inode
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sb_qflags dw ? ; quota flags
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sb_flags db ? ; misc. flags
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sb_shared_vn db ? ; shared version number
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sb_inoalignmt dd ? ; inode chunk alignment, fsblocks
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sb_unit dd ? ; stripe or raid unit
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sb_width dd ? ; stripe or raid width
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sb_dirblklog db ? ; log2 of dir block size (fsbs)
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sb_logsectlog db ? ; log2 of the log sector size
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sb_logsectsize dw ? ; sector size for the log, bytes
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sb_logsunit dd ? ; stripe unit size for the log
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sb_features2 dd ? ; additional feature bits
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ends
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; allocation group inode (xfs_ag.h)
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struct xfs_agi
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agi_magicnum dd ? ; magic number == XFS_AGI_MAGIC
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agi_versionnum dd ? ; header version == XFS_AGI_VERSION
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agi_seqno dd ? ; sequence number starting from 0
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agi_length dd ? ; size in blocks of a.g.
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agi_count dd ? ; count of allocated inodes
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agi_root dd ? ; root of inode btree
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agi_level dd ? ; levels in inode btree
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agi_freecount dd ? ; number of free inodes
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agi_newino dd ? ; new inode just allocated
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agi_dirino dd ? ; last directory inode chunk
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agi_unlinked rd XFS_AGI_UNLINKED_BUCKETS ; Hash table of inodes which have been unlinked but are still being referenced
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ends
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; superblock structure of b+tree node/leaf (same structure, bb_level matters)
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struct xfs_btree_sblock
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bb_magic dd ?
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bb_level dw ? ; distinguishes nodeds and leaves
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bb_numrecs dw ?
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bb_leftsib dd ?
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bb_rightsib dd ?
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ends
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; record of b+tree inode
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struct xfs_inobt_rec
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ir_startino dd ?
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ir_freecount dd ?
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ir_free dq ?
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ends
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; structure to store create, access and modification time in inode core
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struct xfs_timestamp
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t_sec dd ?
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t_nsec dd ? ; nanoseconds
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ends
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; inode core structure: basic information about file
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struct xfs_dinode_core
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di_magic dw ? ; inode magic = XFS_DINODE_MAGIC
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di_mode dw ? ; mode and type of file
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di_version db ? ; inode version
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di_format db ? ; format of di_c data
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di_onlink dw ? ; old number of links to file
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di_uid dd ? ; owner's user id
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di_gid dd ? ; owner's group id
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di_nlink dd ? ; number of links to file
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di_projid dw ? ; owner's project id
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di_pad rb 8 ; unused, zeroed space
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di_flushiter dw ? ; incremented on flush
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di_atime xfs_timestamp ; time last accessed
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di_mtime xfs_timestamp ; time last modified
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di_ctime xfs_timestamp ; time created/inode modified
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di_size dq ? ; number of bytes in file
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di_nblocks dq ? ; number of direct & btree blocks used
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di_extsize dd ? ; basic/minimum extent size for file
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di_nextents dd ? ; number of extents in data fork
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di_anextents dw ? ; number of extents in attribute fork
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di_forkoff db ? ; attr fork offs, <<3 for 64b align
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di_aformat db ? ; format of attr fork's data
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di_dmevmask dd ? ; DMIG event mask
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di_dmstate dw ? ; DMIG state info
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di_flags dw ? ; random flags, XFS_DIFLAG_...
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di_gen dd ? ; generation number
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ends
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; shortform dir header
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struct xfs_dir2_sf_hdr
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count db ? ; the number of directory entries, used only if each inode number fits 4 bytes; zero otherwise
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i8count db ? ; the number of directory entries, used only when count is zero
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parent dq ? ; parent inode number: xfs_dir2_inou_t (4 or 8 bytes)
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ends
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; shortform dir entry
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struct xfs_dir2_sf_entry
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namelen db ? ; actual name length (ASCII)
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offset rb 2 ; saved offset
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name db ? ; name, variable size
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; inumber dq ? ; xfs_dir2_inou_t
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ends
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; active entry in a data block
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; aligned to 8 bytes
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; tag appears as the last 2 bytes
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struct xfs_dir2_data_entry
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inumber dq ? ; inode number
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namelen db ? ; name length
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name db ? ; name bytes, no null
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; tag dw ? ; starting offset of us
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ends
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; unused entry in a data block
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; aligned to 8 bytes
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; tag appears as the last 2 bytes
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struct xfs_dir2_data_unused
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freetag dw ? ; XFS_DIR2_DATA_FREE_TAG
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length dw ? ; total free length
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; tag dw ? ; starting offset of us
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ends
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; generic data entry
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struct xfs_dir2_data_union
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union
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xentry xfs_dir2_data_entry
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unused xfs_dir2_data_unused
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ends
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ends
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; describe a free area in the data block
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; the freespace will be formatted as a xfs_dir2_data_unused_t
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struct xfs_dir2_data_free
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offset dw ? ; start of freespace
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length dw ? ; length of freespace
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ends
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; header for the data blocks
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; always at the beginning of a directory-sized block
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; the code knows that XFS_DIR2_DATA_FD_COUNT is 3
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struct xfs_dir2_data_hdr
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magic dd ? ; XFS_DIR2_DATA_MAGIC or XFS_DIR2_BLOCK_MAGIC
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bestfree xfs_dir2_data_free
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bestfree2 xfs_dir2_data_free
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bestfree3 xfs_dir2_data_free
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ends
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; leaf block entry
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struct xfs_dir2_leaf_entry
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hashval dd ? ; hash value of name
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address dd ? ; address of data entry
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ends
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; the tail of directory block
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struct xfs_dir2_block_tail
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count dd ? ; count of leaf entries
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stale dd ? ; count of stale leaf entries
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ends
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; generic single-block structure, for xfs_db
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struct xfs_dir2_block
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hdr xfs_dir2_data_hdr
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u xfs_dir2_data_union
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; leaf xfs_dir2_leaf_entry
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; tail xfs_dir2_block_tail
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ends
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;
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struct xfs_dir2_data
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hdr xfs_dir2_data_hdr ; magic XFS_DIR2_DATA_MAGIC
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u xfs_dir2_data_union
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ends
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;
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struct xfs_da_blkinfo
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forw dd ? ; previous block in list
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back dd ? ; following block in list
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magic dw ? ; validity check on block
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pad dw ? ; unused
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ends
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; leaf block header
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struct xfs_dir2_leaf_hdr
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info xfs_da_blkinfo ; header for da routines
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count dw ? ; count of entries
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stale dw ? ; count of stale entries
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ends
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; leaf block tail
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struct xfs_dir2_leaf_tail
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bestcount dd ?
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ends
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; leaf block
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; bests and tail are at the end of the block for single-leaf only
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; (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC)
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struct xfs_dir2_leaf
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hdr xfs_dir2_leaf_hdr ; leaf header
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ents xfs_dir2_leaf_entry ; entries
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; bests dw ? ; best free counts
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; tail xfs_dir2_leaf_tail ; leaf tail
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ends
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; header of 'free' block part
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struct xfs_dir2_free_hdr
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magic dd ? ; XFS_DIR2_FREE_MAGIC
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firstdb dd ? ; db of first entry
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nvalid dd ? ; count of valid entries
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nused dd ? ; count of used entries
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ends
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; 'free' part of directiry block
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struct xfs_dir2_free
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hdr xfs_dir2_free_hdr ; block header
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bests dw ? ; best free counts
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; unused entries are -1 (XFS_NULL)
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ends
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; b+tree node header
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struct xfs_da_node_hdr
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info xfs_da_blkinfo
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count dw ?
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level dw ?
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ends
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; b+tree node
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struct xfs_da_node_entry
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hashval dd ? ; hash value for this descendant
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before dd ? ; Btree block before this key
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ends
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;
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struct xfs_da_intnode
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hdr xfs_da_node_hdr
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btree xfs_da_node_entry
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ends
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; packet extent
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struct xfs_bmbt_rec
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l0 dq ?
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l1 dq ?
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ends
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; unpacked extent
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struct xfs_bmbt_irec
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br_startoff dq ? ; starting file offset
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br_startblock dq ? ; starting block number
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br_blockcount dd ? ; number of blocks
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br_state dd ? ; extent state
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ends
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; bmap root header, on-disk form only
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struct xfs_bmdr_block
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bb_level dw ? ; 0 is a leaf
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bb_numrecs dw ? ; current number of data records
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ends
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; key structure for non-leaf levels of the tree
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struct xfs_bmbt_key
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br_startoff dq ? ; starting file offset
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ends
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sizeof.xfs_bmbt_ptr = 8 ; workaround
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sizeof.xfs_bmdr_ptr = 8 ; workaround
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; long form header: bmap btrees
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; xfs_btree_lblock is xfs_bmbt_block (xfs_btree.h)
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struct xfs_bmbt_block
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bb_magic dd ? ; magic number for block type
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bb_level dw ? ; 0 is a leaf
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bb_numrecs dw ? ; current number of data records
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bb_leftsib dq ? ; left sibling block or NULLDFSBNO
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bb_rightsib dq ? ; right sibling block or NULLDFSBNO
|
|
ends
|
|
|
|
|
|
; high level inode structure
|
|
struct xfs_inode
|
|
di_core xfs_dinode_core ; main info, aka core
|
|
di_next_unlinked dd ? ; unlinked but still used inode (if any, XFS_NULL otherwise)
|
|
di_u db ? ; data fork inode part
|
|
; di_a db ? ; data attribute
|
|
ends
|
|
|
|
|
|
; internal data for every XFS partition
|
|
; this _is_ XFS partition structure
|
|
; most fields are unpacked or bswap'ed values from the superblock, so see xfs_sb structure above
|
|
struct XFS PARTITION
|
|
Lock MUTEX ? ; access mutex
|
|
blocksize dd ?
|
|
sectsize dd ?
|
|
dirblocksize dd ?
|
|
rootino dq ?
|
|
cur_block dd ?
|
|
cur_inode dd ?
|
|
cur_sect dd ?
|
|
cur_dirblock dd ?
|
|
tmp_inode dd ?
|
|
versionnum dd ?
|
|
features2 dd ?
|
|
inodesize dd ?
|
|
inopblock dd ?
|
|
blocklog dd ?
|
|
sectlog dd ?
|
|
inodelog dd ?
|
|
inopblog dd ?
|
|
agblklog dd ?
|
|
blockmsectlog dd ?
|
|
inodetoblocklog dd ?
|
|
dirblklog dd ?
|
|
sectpblock dd ?
|
|
agblocks dd ?
|
|
; helpers, temporary vars, etc
|
|
agblockmask dq ?
|
|
extent xfs_bmbt_irec
|
|
left_extents dd ?
|
|
left_leaves dd ?
|
|
bytes_to_read dd ?
|
|
bytes_read dd ?
|
|
entries_read dd ?
|
|
file_offset dq ?
|
|
max_dirblockaddr dd ?
|
|
next_block_num dq ?
|
|
dir2_leaf_offset_blocks dd ?
|
|
dir2_free_offset_blocks dd ?
|
|
cur_inode_save dd ?
|
|
bytes_left_in_file dq ?
|
|
ro_nextents dd ?
|
|
bb_ptrs dd ?
|
|
maxnumrecs dd ?
|
|
buffer_pos dd ?
|
|
eof dd ?
|
|
ends
|